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1275 |
phoenix |
/* SCTP kernel reference Implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001-2003 Intel Corp.
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* Copyright (c) 2001-2002 Nokia, Inc.
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* Copyright (c) 2001 La Monte H.P. Yarroll
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*
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* This file is part of the SCTP kernel reference Implementation
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*
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* These functions interface with the sockets layer to implement the
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* SCTP Extensions for the Sockets API.
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*
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* Note that the descriptions from the specification are USER level
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* functions--this file is the functions which populate the struct proto
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* for SCTP which is the BOTTOM of the sockets interface.
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*
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* The SCTP reference 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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* any later version.
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*
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* The SCTP reference 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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*
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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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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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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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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Narasimha Budihal <narsi@refcode.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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* Xingang Guo <xingang.guo@intel.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Sridhar Samudrala <samudrala@us.ibm.com>
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* Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Ryan Layer <rmlayer@us.ibm.com>
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* Anup Pemmaiah <pemmaiah@cc.usu.edu>
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* Kevin Gao <kevin.gao@intel.com>
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*
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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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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/wait.h>
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#include <linux/time.h>
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#include <linux/ip.h>
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#include <linux/fcntl.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/crypto.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/route.h>
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#include <net/ipv6.h>
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#include <net/inet_common.h>
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#include <linux/socket.h> /* for sa_family_t */
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#include <net/sock.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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/* WARNING: Please do not remove the SCTP_STATIC attribute to
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* any of the functions below as they are used to export functions
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* used by a project regression testsuite.
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*/
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/* Forward declarations for internal helper functions. */
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static int sctp_writeable(struct sock *sk);
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static inline int sctp_wspace(struct sctp_association *asoc);
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static inline void sctp_set_owner_w(struct sctp_chunk *chunk);
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static void sctp_wfree(struct sk_buff *skb);
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static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
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size_t msg_len);
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static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
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static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
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static int sctp_wait_for_accept(struct sock *sk, long timeo);
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static void sctp_wait_for_close(struct sock *sk, long timeo);
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static inline int sctp_verify_addr(struct sock *, union sctp_addr *, int);
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static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
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static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
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static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
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static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
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static int sctp_send_asconf(struct sctp_association *asoc,
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struct sctp_chunk *chunk);
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static int sctp_do_bind(struct sock *, union sctp_addr *, int);
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static int sctp_autobind(struct sock *sk);
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static void sctp_sock_migrate(struct sock *, struct sock *,
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struct sctp_association *, sctp_socket_type_t);
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static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
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extern kmem_cache_t *sctp_bucket_cachep;
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extern int sctp_assoc_valid(struct sock *sk, struct sctp_association *asoc);
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/* Look up the association by its id. If this is not a UDP-style
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* socket, the ID field is always ignored.
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*/
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struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
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{
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struct sctp_association *asoc = NULL;
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/* If this is not a UDP-style socket, assoc id should be ignored. */
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if (!sctp_style(sk, UDP)) {
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/* Return NULL if the socket state is not ESTABLISHED. It
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* could be a TCP-style listening socket or a socket which
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* hasn't yet called connect() to establish an association.
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*/
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if (!sctp_sstate(sk, ESTABLISHED))
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return NULL;
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/* Get the first and the only association from the list. */
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if (!list_empty(&sctp_sk(sk)->ep->asocs))
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asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
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struct sctp_association, asocs);
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return asoc;
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}
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/* Otherwise this is a UDP-style socket. */
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asoc = (struct sctp_association *)id;
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if (!sctp_assoc_valid(sk, asoc))
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return NULL;
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return asoc;
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}
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/* Look up the transport from an address and an assoc id. If both address and
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* id are specified, the associations matching the address and the id should be
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* the same.
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*/
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struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
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struct sockaddr_storage *addr,
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sctp_assoc_t id)
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{
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struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
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struct sctp_transport *transport;
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union sctp_addr *laddr = (union sctp_addr *)addr;
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laddr->v4.sin_port = ntohs(laddr->v4.sin_port);
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addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
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(union sctp_addr *)addr,
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&transport);
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laddr->v4.sin_port = htons(laddr->v4.sin_port);
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if (!addr_asoc)
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return NULL;
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id_asoc = sctp_id2assoc(sk, id);
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if (id_asoc && (id_asoc != addr_asoc))
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return NULL;
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sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
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(union sctp_addr *)addr);
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return transport;
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}
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/* API 3.1.2 bind() - UDP Style Syntax
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* The syntax of bind() is,
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*
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* ret = bind(int sd, struct sockaddr *addr, int addrlen);
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180 |
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*
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181 |
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* sd - the socket descriptor returned by socket().
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182 |
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* addr - the address structure (struct sockaddr_in or struct
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183 |
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* sockaddr_in6 [RFC 2553]),
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* addr_len - the size of the address structure.
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*/
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186 |
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int sctp_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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188 |
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int retval = 0;
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189 |
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190 |
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sctp_lock_sock(sk);
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191 |
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192 |
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SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, uaddr: %p, addr_len: %d)\n",
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sk, uaddr, addr_len);
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194 |
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195 |
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/* Disallow binding twice. */
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196 |
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if (!sctp_sk(sk)->ep->base.bind_addr.port)
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197 |
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retval = sctp_do_bind(sk, (union sctp_addr *)uaddr,
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addr_len);
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else
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retval = -EINVAL;
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201 |
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202 |
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sctp_release_sock(sk);
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203 |
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204 |
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return retval;
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205 |
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}
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206 |
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207 |
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static long sctp_get_port_local(struct sock *, union sctp_addr *);
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208 |
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209 |
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/* Verify this is a valid sockaddr. */
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210 |
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static struct sctp_af *sctp_sockaddr_af(struct sctp_opt *opt,
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211 |
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union sctp_addr *addr, int len)
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212 |
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{
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213 |
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struct sctp_af *af;
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214 |
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215 |
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/* Check minimum size. */
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216 |
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if (len < sizeof (struct sockaddr))
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217 |
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return NULL;
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218 |
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219 |
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/* Does this PF support this AF? */
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220 |
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if (!opt->pf->af_supported(addr->sa.sa_family, opt))
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221 |
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return NULL;
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222 |
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223 |
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/* If we get this far, af is valid. */
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224 |
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af = sctp_get_af_specific(addr->sa.sa_family);
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225 |
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226 |
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if (len < af->sockaddr_len)
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227 |
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return NULL;
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228 |
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229 |
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return af;
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230 |
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}
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231 |
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|
232 |
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/* Bind a local address either to an endpoint or to an association. */
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233 |
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SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
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234 |
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{
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235 |
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struct sctp_opt *sp = sctp_sk(sk);
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236 |
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struct sctp_endpoint *ep = sp->ep;
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237 |
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struct sctp_bind_addr *bp = &ep->base.bind_addr;
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238 |
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struct sctp_af *af;
|
239 |
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unsigned short snum;
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240 |
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int ret = 0;
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241 |
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242 |
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SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d)\n",
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243 |
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sk, addr, len);
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244 |
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245 |
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/* Common sockaddr verification. */
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246 |
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af = sctp_sockaddr_af(sp, addr, len);
|
247 |
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if (!af)
|
248 |
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return -EINVAL;
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249 |
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|
250 |
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/* PF specific bind() address verification. */
|
251 |
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if (!sp->pf->bind_verify(sp, addr))
|
252 |
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return -EADDRNOTAVAIL;
|
253 |
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|
254 |
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snum= ntohs(addr->v4.sin_port);
|
255 |
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|
256 |
|
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SCTP_DEBUG_PRINTK("sctp_do_bind: port: %d, new port: %d\n",
|
257 |
|
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bp->port, snum);
|
258 |
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|
259 |
|
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/* We must either be unbound, or bind to the same port. */
|
260 |
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if (bp->port && (snum != bp->port)) {
|
261 |
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SCTP_DEBUG_PRINTK("sctp_do_bind:"
|
262 |
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" New port %d does not match existing port "
|
263 |
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"%d.\n", snum, bp->port);
|
264 |
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return -EINVAL;
|
265 |
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}
|
266 |
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|
267 |
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if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
|
268 |
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return -EACCES;
|
269 |
|
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|
270 |
|
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/* Make sure we are allowed to bind here.
|
271 |
|
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* The function sctp_get_port_local() does duplicate address
|
272 |
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* detection.
|
273 |
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*/
|
274 |
|
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if ((ret = sctp_get_port_local(sk, addr))) {
|
275 |
|
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if (ret == (long) sk) {
|
276 |
|
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/* This endpoint has a conflicting address. */
|
277 |
|
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return -EINVAL;
|
278 |
|
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} else {
|
279 |
|
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return -EADDRINUSE;
|
280 |
|
|
}
|
281 |
|
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}
|
282 |
|
|
|
283 |
|
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/* Refresh ephemeral port. */
|
284 |
|
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if (!snum)
|
285 |
|
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snum = sk->num;
|
286 |
|
|
|
287 |
|
|
/* Add the address to the bind address list. */
|
288 |
|
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sctp_local_bh_disable();
|
289 |
|
|
sctp_write_lock(&ep->base.addr_lock);
|
290 |
|
|
|
291 |
|
|
/* Use GFP_ATOMIC since BHs are disabled. */
|
292 |
|
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addr->v4.sin_port = ntohs(addr->v4.sin_port);
|
293 |
|
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ret = sctp_add_bind_addr(bp, addr, GFP_ATOMIC);
|
294 |
|
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addr->v4.sin_port = htons(addr->v4.sin_port);
|
295 |
|
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if (!ret && !bp->port)
|
296 |
|
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bp->port = snum;
|
297 |
|
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sctp_write_unlock(&ep->base.addr_lock);
|
298 |
|
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sctp_local_bh_enable();
|
299 |
|
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|
300 |
|
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/* Copy back into socket for getsockname() use. */
|
301 |
|
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if (!ret) {
|
302 |
|
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sk->sport = htons(sk->num);
|
303 |
|
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af->to_sk_saddr(addr, sk);
|
304 |
|
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}
|
305 |
|
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|
306 |
|
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return ret;
|
307 |
|
|
}
|
308 |
|
|
|
309 |
|
|
/* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
|
310 |
|
|
*
|
311 |
|
|
* R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
|
312 |
|
|
* at any one time. If a sender, after sending an ASCONF chunk, decides
|
313 |
|
|
* it needs to transfer another ASCONF Chunk, it MUST wait until the
|
314 |
|
|
* ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
|
315 |
|
|
* subsequent ASCONF. Note this restriction binds each side, so at any
|
316 |
|
|
* time two ASCONF may be in-transit on any given association (one sent
|
317 |
|
|
* from each endpoint).
|
318 |
|
|
*/
|
319 |
|
|
static int sctp_send_asconf(struct sctp_association *asoc,
|
320 |
|
|
struct sctp_chunk *chunk)
|
321 |
|
|
{
|
322 |
|
|
int retval = 0;
|
323 |
|
|
|
324 |
|
|
/* If there is an outstanding ASCONF chunk, queue it for later
|
325 |
|
|
* transmission.
|
326 |
|
|
*/
|
327 |
|
|
if (asoc->addip_last_asconf) {
|
328 |
|
|
__skb_queue_tail(&asoc->addip_chunks, (struct sk_buff *)chunk);
|
329 |
|
|
goto out;
|
330 |
|
|
}
|
331 |
|
|
|
332 |
|
|
/* Hold the chunk until an ASCONF_ACK is received. */
|
333 |
|
|
sctp_chunk_hold(chunk);
|
334 |
|
|
retval = sctp_primitive_ASCONF(asoc, chunk);
|
335 |
|
|
if (retval)
|
336 |
|
|
sctp_chunk_free(chunk);
|
337 |
|
|
else
|
338 |
|
|
asoc->addip_last_asconf = chunk;
|
339 |
|
|
|
340 |
|
|
out:
|
341 |
|
|
return retval;
|
342 |
|
|
}
|
343 |
|
|
|
344 |
|
|
/* Add a list of addresses as bind addresses to local endpoint or
|
345 |
|
|
* association.
|
346 |
|
|
*
|
347 |
|
|
* Basically run through each address specified in the addrs/addrcnt
|
348 |
|
|
* array/length pair, determine if it is IPv6 or IPv4 and call
|
349 |
|
|
* sctp_do_bind() on it.
|
350 |
|
|
*
|
351 |
|
|
* If any of them fails, then the operation will be reversed and the
|
352 |
|
|
* ones that were added will be removed.
|
353 |
|
|
*
|
354 |
|
|
* Only sctp_setsockopt_bindx() is supposed to call this function.
|
355 |
|
|
*/
|
356 |
|
|
int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
|
357 |
|
|
{
|
358 |
|
|
int cnt;
|
359 |
|
|
int retval = 0;
|
360 |
|
|
void *addr_buf;
|
361 |
|
|
struct sockaddr *sa_addr;
|
362 |
|
|
struct sctp_af *af;
|
363 |
|
|
|
364 |
|
|
SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
|
365 |
|
|
sk, addrs, addrcnt);
|
366 |
|
|
|
367 |
|
|
addr_buf = addrs;
|
368 |
|
|
for (cnt = 0; cnt < addrcnt; cnt++) {
|
369 |
|
|
/* The list may contain either IPv4 or IPv6 address;
|
370 |
|
|
* determine the address length for walking thru the list.
|
371 |
|
|
*/
|
372 |
|
|
sa_addr = (struct sockaddr *)addr_buf;
|
373 |
|
|
af = sctp_get_af_specific(sa_addr->sa_family);
|
374 |
|
|
if (!af) {
|
375 |
|
|
retval = -EINVAL;
|
376 |
|
|
goto err_bindx_add;
|
377 |
|
|
}
|
378 |
|
|
|
379 |
|
|
retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
|
380 |
|
|
af->sockaddr_len);
|
381 |
|
|
|
382 |
|
|
addr_buf += af->sockaddr_len;
|
383 |
|
|
|
384 |
|
|
err_bindx_add:
|
385 |
|
|
if (retval < 0) {
|
386 |
|
|
/* Failed. Cleanup the ones that have been added */
|
387 |
|
|
if (cnt > 0)
|
388 |
|
|
sctp_bindx_rem(sk, addrs, cnt);
|
389 |
|
|
return retval;
|
390 |
|
|
}
|
391 |
|
|
}
|
392 |
|
|
|
393 |
|
|
return retval;
|
394 |
|
|
}
|
395 |
|
|
|
396 |
|
|
/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
|
397 |
|
|
* associations that are part of the endpoint indicating that a list of local
|
398 |
|
|
* addresses are added to the endpoint.
|
399 |
|
|
*
|
400 |
|
|
* If any of the addresses is already in the bind address list of the
|
401 |
|
|
* association, we do not send the chunk for that association. But it will not
|
402 |
|
|
* affect other associations.
|
403 |
|
|
*
|
404 |
|
|
* Only sctp_setsockopt_bindx() is supposed to call this function.
|
405 |
|
|
*/
|
406 |
|
|
static int sctp_send_asconf_add_ip(struct sock *sk,
|
407 |
|
|
struct sockaddr *addrs,
|
408 |
|
|
int addrcnt)
|
409 |
|
|
{
|
410 |
|
|
struct sctp_opt *sp;
|
411 |
|
|
struct sctp_endpoint *ep;
|
412 |
|
|
struct sctp_association *asoc;
|
413 |
|
|
struct sctp_bind_addr *bp;
|
414 |
|
|
struct sctp_chunk *chunk;
|
415 |
|
|
struct sctp_sockaddr_entry *laddr;
|
416 |
|
|
union sctp_addr *addr;
|
417 |
|
|
void *addr_buf;
|
418 |
|
|
struct sctp_af *af;
|
419 |
|
|
struct list_head *pos;
|
420 |
|
|
struct list_head *p;
|
421 |
|
|
int i;
|
422 |
|
|
int retval = 0;
|
423 |
|
|
|
424 |
|
|
if (!sctp_addip_enable)
|
425 |
|
|
return retval;
|
426 |
|
|
|
427 |
|
|
sp = sctp_sk(sk);
|
428 |
|
|
ep = sp->ep;
|
429 |
|
|
|
430 |
|
|
SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
|
431 |
|
|
__FUNCTION__, sk, addrs, addrcnt);
|
432 |
|
|
|
433 |
|
|
list_for_each(pos, &ep->asocs) {
|
434 |
|
|
asoc = list_entry(pos, struct sctp_association, asocs);
|
435 |
|
|
|
436 |
|
|
if (!asoc->peer.asconf_capable)
|
437 |
|
|
continue;
|
438 |
|
|
|
439 |
|
|
if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
|
440 |
|
|
continue;
|
441 |
|
|
|
442 |
|
|
if (!sctp_state(asoc, ESTABLISHED))
|
443 |
|
|
continue;
|
444 |
|
|
|
445 |
|
|
/* Check if any address in the packed array of addresses is
|
446 |
|
|
* in the bind address list of the association. If so,
|
447 |
|
|
* do not send the asconf chunk to its peer, but continue with
|
448 |
|
|
* other associations.
|
449 |
|
|
*/
|
450 |
|
|
addr_buf = addrs;
|
451 |
|
|
for (i = 0; i < addrcnt; i++) {
|
452 |
|
|
addr = (union sctp_addr *)addr_buf;
|
453 |
|
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
454 |
|
|
if (!af) {
|
455 |
|
|
retval = -EINVAL;
|
456 |
|
|
goto out;
|
457 |
|
|
}
|
458 |
|
|
|
459 |
|
|
if (sctp_assoc_lookup_laddr(asoc, addr))
|
460 |
|
|
break;
|
461 |
|
|
|
462 |
|
|
addr_buf += af->sockaddr_len;
|
463 |
|
|
}
|
464 |
|
|
if (i < addrcnt)
|
465 |
|
|
continue;
|
466 |
|
|
|
467 |
|
|
/* Use the first address in bind addr list of association as
|
468 |
|
|
* Address Parameter of ASCONF CHUNK.
|
469 |
|
|
*/
|
470 |
|
|
sctp_read_lock(&asoc->base.addr_lock);
|
471 |
|
|
bp = &asoc->base.bind_addr;
|
472 |
|
|
p = bp->address_list.next;
|
473 |
|
|
laddr = list_entry(p, struct sctp_sockaddr_entry, list);
|
474 |
|
|
sctp_read_unlock(&asoc->base.addr_lock);
|
475 |
|
|
|
476 |
|
|
chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
|
477 |
|
|
addrcnt, SCTP_PARAM_ADD_IP);
|
478 |
|
|
if (!chunk) {
|
479 |
|
|
retval = -ENOMEM;
|
480 |
|
|
goto out;
|
481 |
|
|
}
|
482 |
|
|
|
483 |
|
|
retval = sctp_send_asconf(asoc, chunk);
|
484 |
|
|
|
485 |
|
|
/* FIXME: After sending the add address ASCONF chunk, we
|
486 |
|
|
* cannot append the address to the association's binding
|
487 |
|
|
* address list, because the new address may be used as the
|
488 |
|
|
* source of a message sent to the peer before the ASCONF
|
489 |
|
|
* chunk is received by the peer. So we should wait until
|
490 |
|
|
* ASCONF_ACK is received.
|
491 |
|
|
*/
|
492 |
|
|
}
|
493 |
|
|
|
494 |
|
|
out:
|
495 |
|
|
return retval;
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
/* Remove a list of addresses from bind addresses list. Do not remove the
|
499 |
|
|
* last address.
|
500 |
|
|
*
|
501 |
|
|
* Basically run through each address specified in the addrs/addrcnt
|
502 |
|
|
* array/length pair, determine if it is IPv6 or IPv4 and call
|
503 |
|
|
* sctp_del_bind() on it.
|
504 |
|
|
*
|
505 |
|
|
* If any of them fails, then the operation will be reversed and the
|
506 |
|
|
* ones that were removed will be added back.
|
507 |
|
|
*
|
508 |
|
|
* At least one address has to be left; if only one address is
|
509 |
|
|
* available, the operation will return -EBUSY.
|
510 |
|
|
*
|
511 |
|
|
* Only sctp_setsockopt_bindx() is supposed to call this function.
|
512 |
|
|
*/
|
513 |
|
|
int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
|
514 |
|
|
{
|
515 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
516 |
|
|
struct sctp_endpoint *ep = sp->ep;
|
517 |
|
|
int cnt;
|
518 |
|
|
struct sctp_bind_addr *bp = &ep->base.bind_addr;
|
519 |
|
|
int retval = 0;
|
520 |
|
|
union sctp_addr saveaddr;
|
521 |
|
|
void *addr_buf;
|
522 |
|
|
struct sockaddr *sa_addr;
|
523 |
|
|
struct sctp_af *af;
|
524 |
|
|
|
525 |
|
|
SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
|
526 |
|
|
sk, addrs, addrcnt);
|
527 |
|
|
|
528 |
|
|
addr_buf = addrs;
|
529 |
|
|
for (cnt = 0; cnt < addrcnt; cnt++) {
|
530 |
|
|
/* If the bind address list is empty or if there is only one
|
531 |
|
|
* bind address, there is nothing more to be removed (we need
|
532 |
|
|
* at least one address here).
|
533 |
|
|
*/
|
534 |
|
|
if (list_empty(&bp->address_list) ||
|
535 |
|
|
(sctp_list_single_entry(&bp->address_list))) {
|
536 |
|
|
retval = -EBUSY;
|
537 |
|
|
goto err_bindx_rem;
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
/* The list may contain either IPv4 or IPv6 address;
|
541 |
|
|
* determine the address length to copy the address to
|
542 |
|
|
* saveaddr.
|
543 |
|
|
*/
|
544 |
|
|
sa_addr = (struct sockaddr *)addr_buf;
|
545 |
|
|
af = sctp_get_af_specific(sa_addr->sa_family);
|
546 |
|
|
if (!af) {
|
547 |
|
|
retval = -EINVAL;
|
548 |
|
|
goto err_bindx_rem;
|
549 |
|
|
}
|
550 |
|
|
memcpy(&saveaddr, sa_addr, af->sockaddr_len);
|
551 |
|
|
saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
|
552 |
|
|
if (saveaddr.v4.sin_port != bp->port) {
|
553 |
|
|
retval = -EINVAL;
|
554 |
|
|
goto err_bindx_rem;
|
555 |
|
|
}
|
556 |
|
|
|
557 |
|
|
/* FIXME - There is probably a need to check if sk->sk_saddr and
|
558 |
|
|
* sk->sk_rcv_addr are currently set to one of the addresses to
|
559 |
|
|
* be removed. This is something which needs to be looked into
|
560 |
|
|
* when we are fixing the outstanding issues with multi-homing
|
561 |
|
|
* socket routing and failover schemes. Refer to comments in
|
562 |
|
|
* sctp_do_bind(). -daisy
|
563 |
|
|
*/
|
564 |
|
|
sctp_local_bh_disable();
|
565 |
|
|
sctp_write_lock(&ep->base.addr_lock);
|
566 |
|
|
|
567 |
|
|
retval = sctp_del_bind_addr(bp, &saveaddr);
|
568 |
|
|
|
569 |
|
|
sctp_write_unlock(&ep->base.addr_lock);
|
570 |
|
|
sctp_local_bh_enable();
|
571 |
|
|
|
572 |
|
|
addr_buf += af->sockaddr_len;
|
573 |
|
|
err_bindx_rem:
|
574 |
|
|
if (retval < 0) {
|
575 |
|
|
/* Failed. Add the ones that has been removed back */
|
576 |
|
|
if (cnt > 0)
|
577 |
|
|
sctp_bindx_add(sk, addrs, cnt);
|
578 |
|
|
return retval;
|
579 |
|
|
}
|
580 |
|
|
}
|
581 |
|
|
|
582 |
|
|
return retval;
|
583 |
|
|
}
|
584 |
|
|
|
585 |
|
|
/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
|
586 |
|
|
* the associations that are part of the endpoint indicating that a list of
|
587 |
|
|
* local addresses are removed from the endpoint.
|
588 |
|
|
*
|
589 |
|
|
* If any of the addresses is already in the bind address list of the
|
590 |
|
|
* association, we do not send the chunk for that association. But it will not
|
591 |
|
|
* affect other associations.
|
592 |
|
|
*
|
593 |
|
|
* Only sctp_setsockopt_bindx() is supposed to call this function.
|
594 |
|
|
*/
|
595 |
|
|
static int sctp_send_asconf_del_ip(struct sock *sk,
|
596 |
|
|
struct sockaddr *addrs,
|
597 |
|
|
int addrcnt)
|
598 |
|
|
{
|
599 |
|
|
struct sctp_opt *sp;
|
600 |
|
|
struct sctp_endpoint *ep;
|
601 |
|
|
struct sctp_association *asoc;
|
602 |
|
|
struct sctp_bind_addr *bp;
|
603 |
|
|
struct sctp_chunk *chunk;
|
604 |
|
|
union sctp_addr *laddr;
|
605 |
|
|
void *addr_buf;
|
606 |
|
|
struct sctp_af *af;
|
607 |
|
|
struct list_head *pos;
|
608 |
|
|
int i;
|
609 |
|
|
int retval = 0;
|
610 |
|
|
|
611 |
|
|
if (!sctp_addip_enable)
|
612 |
|
|
return retval;
|
613 |
|
|
|
614 |
|
|
sp = sctp_sk(sk);
|
615 |
|
|
ep = sp->ep;
|
616 |
|
|
|
617 |
|
|
SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
|
618 |
|
|
__FUNCTION__, sk, addrs, addrcnt);
|
619 |
|
|
|
620 |
|
|
list_for_each(pos, &ep->asocs) {
|
621 |
|
|
asoc = list_entry(pos, struct sctp_association, asocs);
|
622 |
|
|
|
623 |
|
|
if (!asoc->peer.asconf_capable)
|
624 |
|
|
continue;
|
625 |
|
|
|
626 |
|
|
if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
|
627 |
|
|
continue;
|
628 |
|
|
|
629 |
|
|
if (!sctp_state(asoc, ESTABLISHED))
|
630 |
|
|
continue;
|
631 |
|
|
|
632 |
|
|
/* Check if any address in the packed array of addresses is
|
633 |
|
|
* not present in the bind address list of the association.
|
634 |
|
|
* If so, do not send the asconf chunk to its peer, but
|
635 |
|
|
* continue with other associations.
|
636 |
|
|
*/
|
637 |
|
|
addr_buf = addrs;
|
638 |
|
|
for (i = 0; i < addrcnt; i++) {
|
639 |
|
|
laddr = (union sctp_addr *)addr_buf;
|
640 |
|
|
af = sctp_get_af_specific(laddr->v4.sin_family);
|
641 |
|
|
if (!af) {
|
642 |
|
|
retval = -EINVAL;
|
643 |
|
|
goto out;
|
644 |
|
|
}
|
645 |
|
|
|
646 |
|
|
if (!sctp_assoc_lookup_laddr(asoc, laddr))
|
647 |
|
|
break;
|
648 |
|
|
|
649 |
|
|
addr_buf += af->sockaddr_len;
|
650 |
|
|
}
|
651 |
|
|
if (i < addrcnt)
|
652 |
|
|
continue;
|
653 |
|
|
|
654 |
|
|
/* Find one address in the association's bind address list
|
655 |
|
|
* that is not in the packed array of addresses. This is to
|
656 |
|
|
* make sure that we do not delete all the addresses in the
|
657 |
|
|
* association.
|
658 |
|
|
*/
|
659 |
|
|
sctp_read_lock(&asoc->base.addr_lock);
|
660 |
|
|
bp = &asoc->base.bind_addr;
|
661 |
|
|
laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
|
662 |
|
|
addrcnt, sp);
|
663 |
|
|
sctp_read_unlock(&asoc->base.addr_lock);
|
664 |
|
|
if (!laddr)
|
665 |
|
|
continue;
|
666 |
|
|
|
667 |
|
|
chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
|
668 |
|
|
SCTP_PARAM_DEL_IP);
|
669 |
|
|
if (!chunk) {
|
670 |
|
|
retval = -ENOMEM;
|
671 |
|
|
goto out;
|
672 |
|
|
}
|
673 |
|
|
|
674 |
|
|
retval = sctp_send_asconf(asoc, chunk);
|
675 |
|
|
|
676 |
|
|
/* FIXME: After sending the delete address ASCONF chunk, we
|
677 |
|
|
* cannot remove the addresses from the association's bind
|
678 |
|
|
* address list, because there maybe some packet send to
|
679 |
|
|
* the delete addresses, so we should wait until ASCONF_ACK
|
680 |
|
|
* packet is received.
|
681 |
|
|
*/
|
682 |
|
|
}
|
683 |
|
|
out:
|
684 |
|
|
return retval;
|
685 |
|
|
}
|
686 |
|
|
|
687 |
|
|
/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
|
688 |
|
|
*
|
689 |
|
|
* API 8.1
|
690 |
|
|
* int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
|
691 |
|
|
* int flags);
|
692 |
|
|
*
|
693 |
|
|
* If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
|
694 |
|
|
* If the sd is an IPv6 socket, the addresses passed can either be IPv4
|
695 |
|
|
* or IPv6 addresses.
|
696 |
|
|
*
|
697 |
|
|
* A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
|
698 |
|
|
* Section 3.1.2 for this usage.
|
699 |
|
|
*
|
700 |
|
|
* addrs is a pointer to an array of one or more socket addresses. Each
|
701 |
|
|
* address is contained in its appropriate structure (i.e. struct
|
702 |
|
|
* sockaddr_in or struct sockaddr_in6) the family of the address type
|
703 |
|
|
* must be used to distengish the address length (note that this
|
704 |
|
|
* representation is termed a "packed array" of addresses). The caller
|
705 |
|
|
* specifies the number of addresses in the array with addrcnt.
|
706 |
|
|
*
|
707 |
|
|
* On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
|
708 |
|
|
* -1, and sets errno to the appropriate error code.
|
709 |
|
|
*
|
710 |
|
|
* For SCTP, the port given in each socket address must be the same, or
|
711 |
|
|
* sctp_bindx() will fail, setting errno to EINVAL.
|
712 |
|
|
*
|
713 |
|
|
* The flags parameter is formed from the bitwise OR of zero or more of
|
714 |
|
|
* the following currently defined flags:
|
715 |
|
|
*
|
716 |
|
|
* SCTP_BINDX_ADD_ADDR
|
717 |
|
|
*
|
718 |
|
|
* SCTP_BINDX_REM_ADDR
|
719 |
|
|
*
|
720 |
|
|
* SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
|
721 |
|
|
* association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
|
722 |
|
|
* addresses from the association. The two flags are mutually exclusive;
|
723 |
|
|
* if both are given, sctp_bindx() will fail with EINVAL. A caller may
|
724 |
|
|
* not remove all addresses from an association; sctp_bindx() will
|
725 |
|
|
* reject such an attempt with EINVAL.
|
726 |
|
|
*
|
727 |
|
|
* An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
|
728 |
|
|
* additional addresses with an endpoint after calling bind(). Or use
|
729 |
|
|
* sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
|
730 |
|
|
* socket is associated with so that no new association accepted will be
|
731 |
|
|
* associated with those addresses. If the endpoint supports dynamic
|
732 |
|
|
* address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
|
733 |
|
|
* endpoint to send the appropriate message to the peer to change the
|
734 |
|
|
* peers address lists.
|
735 |
|
|
*
|
736 |
|
|
* Adding and removing addresses from a connected association is
|
737 |
|
|
* optional functionality. Implementations that do not support this
|
738 |
|
|
* functionality should return EOPNOTSUPP.
|
739 |
|
|
*
|
740 |
|
|
* Basically do nothing but copying the addresses from user to kernel
|
741 |
|
|
* land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
|
742 |
|
|
* This is used for tunneling the sctp_bindx() request through sctp_setsockopt() * from userspace.
|
743 |
|
|
*
|
744 |
|
|
* We don't use copy_from_user() for optimization: we first do the
|
745 |
|
|
* sanity checks (buffer size -fast- and access check-healthy
|
746 |
|
|
* pointer); if all of those succeed, then we can alloc the memory
|
747 |
|
|
* (expensive operation) needed to copy the data to kernel. Then we do
|
748 |
|
|
* the copying without checking the user space area
|
749 |
|
|
* (__copy_from_user()).
|
750 |
|
|
*
|
751 |
|
|
* On exit there is no need to do sockfd_put(), sys_setsockopt() does
|
752 |
|
|
* it.
|
753 |
|
|
*
|
754 |
|
|
* sk The sk of the socket
|
755 |
|
|
* addrs The pointer to the addresses in user land
|
756 |
|
|
* addrssize Size of the addrs buffer
|
757 |
|
|
* op Operation to perform (add or remove, see the flags of
|
758 |
|
|
* sctp_bindx)
|
759 |
|
|
*
|
760 |
|
|
* Returns 0 if ok, <0 errno code on error.
|
761 |
|
|
*/
|
762 |
|
|
SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk, struct sockaddr *addrs,
|
763 |
|
|
int addrs_size, int op)
|
764 |
|
|
{
|
765 |
|
|
struct sockaddr *kaddrs;
|
766 |
|
|
int err;
|
767 |
|
|
int addrcnt = 0;
|
768 |
|
|
int walk_size = 0;
|
769 |
|
|
struct sockaddr *sa_addr;
|
770 |
|
|
void *addr_buf;
|
771 |
|
|
struct sctp_af *af;
|
772 |
|
|
|
773 |
|
|
SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
|
774 |
|
|
" addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
|
775 |
|
|
|
776 |
|
|
if (unlikely(addrs_size <= 0))
|
777 |
|
|
return -EINVAL;
|
778 |
|
|
|
779 |
|
|
/* Check the user passed a healthy pointer. */
|
780 |
|
|
if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
|
781 |
|
|
return -EFAULT;
|
782 |
|
|
|
783 |
|
|
/* Alloc space for the address array in kernel memory. */
|
784 |
|
|
kaddrs = (struct sockaddr *)kmalloc(addrs_size, GFP_KERNEL);
|
785 |
|
|
if (unlikely(!kaddrs))
|
786 |
|
|
return -ENOMEM;
|
787 |
|
|
|
788 |
|
|
if (__copy_from_user(kaddrs, addrs, addrs_size)) {
|
789 |
|
|
kfree(kaddrs);
|
790 |
|
|
return -EFAULT;
|
791 |
|
|
}
|
792 |
|
|
|
793 |
|
|
/* Walk through the addrs buffer and count the number of addresses. */
|
794 |
|
|
addr_buf = kaddrs;
|
795 |
|
|
while (walk_size < addrs_size) {
|
796 |
|
|
sa_addr = (struct sockaddr *)addr_buf;
|
797 |
|
|
af = sctp_get_af_specific(sa_addr->sa_family);
|
798 |
|
|
|
799 |
|
|
/* If the address family is not supported or if this address
|
800 |
|
|
* causes the address buffer to overflow return EINVAL.
|
801 |
|
|
*/
|
802 |
|
|
if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
|
803 |
|
|
kfree(kaddrs);
|
804 |
|
|
return -EINVAL;
|
805 |
|
|
}
|
806 |
|
|
addrcnt++;
|
807 |
|
|
addr_buf += af->sockaddr_len;
|
808 |
|
|
walk_size += af->sockaddr_len;
|
809 |
|
|
}
|
810 |
|
|
|
811 |
|
|
/* Do the work. */
|
812 |
|
|
switch (op) {
|
813 |
|
|
case SCTP_BINDX_ADD_ADDR:
|
814 |
|
|
err = sctp_bindx_add(sk, kaddrs, addrcnt);
|
815 |
|
|
if (err)
|
816 |
|
|
goto out;
|
817 |
|
|
err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
|
818 |
|
|
break;
|
819 |
|
|
|
820 |
|
|
case SCTP_BINDX_REM_ADDR:
|
821 |
|
|
err = sctp_bindx_rem(sk, kaddrs, addrcnt);
|
822 |
|
|
if (err)
|
823 |
|
|
goto out;
|
824 |
|
|
err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
|
825 |
|
|
break;
|
826 |
|
|
|
827 |
|
|
default:
|
828 |
|
|
err = -EINVAL;
|
829 |
|
|
break;
|
830 |
|
|
};
|
831 |
|
|
|
832 |
|
|
out:
|
833 |
|
|
kfree(kaddrs);
|
834 |
|
|
|
835 |
|
|
return err;
|
836 |
|
|
}
|
837 |
|
|
|
838 |
|
|
/* API 3.1.4 close() - UDP Style Syntax
|
839 |
|
|
* Applications use close() to perform graceful shutdown (as described in
|
840 |
|
|
* Section 10.1 of [SCTP]) on ALL the associations currently represented
|
841 |
|
|
* by a UDP-style socket.
|
842 |
|
|
*
|
843 |
|
|
* The syntax is
|
844 |
|
|
*
|
845 |
|
|
* ret = close(int sd);
|
846 |
|
|
*
|
847 |
|
|
* sd - the socket descriptor of the associations to be closed.
|
848 |
|
|
*
|
849 |
|
|
* To gracefully shutdown a specific association represented by the
|
850 |
|
|
* UDP-style socket, an application should use the sendmsg() call,
|
851 |
|
|
* passing no user data, but including the appropriate flag in the
|
852 |
|
|
* ancillary data (see Section xxxx).
|
853 |
|
|
*
|
854 |
|
|
* If sd in the close() call is a branched-off socket representing only
|
855 |
|
|
* one association, the shutdown is performed on that association only.
|
856 |
|
|
*
|
857 |
|
|
* 4.1.6 close() - TCP Style Syntax
|
858 |
|
|
*
|
859 |
|
|
* Applications use close() to gracefully close down an association.
|
860 |
|
|
*
|
861 |
|
|
* The syntax is:
|
862 |
|
|
*
|
863 |
|
|
* int close(int sd);
|
864 |
|
|
*
|
865 |
|
|
* sd - the socket descriptor of the association to be closed.
|
866 |
|
|
*
|
867 |
|
|
* After an application calls close() on a socket descriptor, no further
|
868 |
|
|
* socket operations will succeed on that descriptor.
|
869 |
|
|
*
|
870 |
|
|
* API 7.1.4 SO_LINGER
|
871 |
|
|
*
|
872 |
|
|
* An application using the TCP-style socket can use this option to
|
873 |
|
|
* perform the SCTP ABORT primitive. The linger option structure is:
|
874 |
|
|
*
|
875 |
|
|
* struct linger {
|
876 |
|
|
* int l_onoff; // option on/off
|
877 |
|
|
* int l_linger; // linger time
|
878 |
|
|
* };
|
879 |
|
|
*
|
880 |
|
|
* To enable the option, set l_onoff to 1. If the l_linger value is set
|
881 |
|
|
* to 0, calling close() is the same as the ABORT primitive. If the
|
882 |
|
|
* value is set to a negative value, the setsockopt() call will return
|
883 |
|
|
* an error. If the value is set to a positive value linger_time, the
|
884 |
|
|
* close() can be blocked for at most linger_time ms. If the graceful
|
885 |
|
|
* shutdown phase does not finish during this period, close() will
|
886 |
|
|
* return but the graceful shutdown phase continues in the system.
|
887 |
|
|
*/
|
888 |
|
|
SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
|
889 |
|
|
{
|
890 |
|
|
struct sctp_endpoint *ep;
|
891 |
|
|
struct sctp_association *asoc;
|
892 |
|
|
struct list_head *pos, *temp;
|
893 |
|
|
|
894 |
|
|
SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
|
895 |
|
|
|
896 |
|
|
sctp_lock_sock(sk);
|
897 |
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
898 |
|
|
|
899 |
|
|
ep = sctp_sk(sk)->ep;
|
900 |
|
|
|
901 |
|
|
/* Walk all associations on a socket, not on an endpoint. */
|
902 |
|
|
list_for_each_safe(pos, temp, &ep->asocs) {
|
903 |
|
|
asoc = list_entry(pos, struct sctp_association, asocs);
|
904 |
|
|
|
905 |
|
|
if (sctp_style(sk, TCP)) {
|
906 |
|
|
/* A closed association can still be in the list if
|
907 |
|
|
* it belongs to a TCP-style listening socket that is
|
908 |
|
|
* not yet accepted. If so, free it. If not, send an
|
909 |
|
|
* ABORT or SHUTDOWN based on the linger options.
|
910 |
|
|
*/
|
911 |
|
|
if (sctp_state(asoc, CLOSED)) {
|
912 |
|
|
sctp_unhash_established(asoc);
|
913 |
|
|
sctp_association_free(asoc);
|
914 |
|
|
|
915 |
|
|
} else if (sk->linger && !sk->sk_lingertime)
|
916 |
|
|
sctp_primitive_ABORT(asoc, NULL);
|
917 |
|
|
else
|
918 |
|
|
sctp_primitive_SHUTDOWN(asoc, NULL);
|
919 |
|
|
} else
|
920 |
|
|
sctp_primitive_SHUTDOWN(asoc, NULL);
|
921 |
|
|
}
|
922 |
|
|
|
923 |
|
|
/* Clean up any skbs sitting on the receive queue. */
|
924 |
|
|
sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
|
925 |
|
|
sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
|
926 |
|
|
|
927 |
|
|
/* On a TCP-style socket, block for at most linger_time if set. */
|
928 |
|
|
if (sctp_style(sk, TCP) && timeout)
|
929 |
|
|
sctp_wait_for_close(sk, timeout);
|
930 |
|
|
|
931 |
|
|
/* This will run the backlog queue. */
|
932 |
|
|
sctp_release_sock(sk);
|
933 |
|
|
|
934 |
|
|
/* Supposedly, no process has access to the socket, but
|
935 |
|
|
* the net layers still may.
|
936 |
|
|
*/
|
937 |
|
|
sctp_local_bh_disable();
|
938 |
|
|
sctp_bh_lock_sock(sk);
|
939 |
|
|
|
940 |
|
|
/* Hold the sock, since inet_sock_release() will put sock_put()
|
941 |
|
|
* and we have just a little more cleanup.
|
942 |
|
|
*/
|
943 |
|
|
sock_hold(sk);
|
944 |
|
|
inet_sock_release(sk);
|
945 |
|
|
|
946 |
|
|
sctp_bh_unlock_sock(sk);
|
947 |
|
|
sctp_local_bh_enable();
|
948 |
|
|
|
949 |
|
|
sock_put(sk);
|
950 |
|
|
|
951 |
|
|
SCTP_DBG_OBJCNT_DEC(sock);
|
952 |
|
|
}
|
953 |
|
|
|
954 |
|
|
/* Handle EPIPE error. */
|
955 |
|
|
static int sctp_error(struct sock *sk, int flags, int err)
|
956 |
|
|
{
|
957 |
|
|
if (err == -EPIPE)
|
958 |
|
|
err = sock_error(sk) ? : -EPIPE;
|
959 |
|
|
if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
|
960 |
|
|
send_sig(SIGPIPE, current, 0);
|
961 |
|
|
return err;
|
962 |
|
|
}
|
963 |
|
|
|
964 |
|
|
/* API 3.1.3 sendmsg() - UDP Style Syntax
|
965 |
|
|
*
|
966 |
|
|
* An application uses sendmsg() and recvmsg() calls to transmit data to
|
967 |
|
|
* and receive data from its peer.
|
968 |
|
|
*
|
969 |
|
|
* ssize_t sendmsg(int socket, const struct msghdr *message,
|
970 |
|
|
* int flags);
|
971 |
|
|
*
|
972 |
|
|
* socket - the socket descriptor of the endpoint.
|
973 |
|
|
* message - pointer to the msghdr structure which contains a single
|
974 |
|
|
* user message and possibly some ancillary data.
|
975 |
|
|
*
|
976 |
|
|
* See Section 5 for complete description of the data
|
977 |
|
|
* structures.
|
978 |
|
|
*
|
979 |
|
|
* flags - flags sent or received with the user message, see Section
|
980 |
|
|
* 5 for complete description of the flags.
|
981 |
|
|
*
|
982 |
|
|
* Note: This function could use a rewrite especially when explicit
|
983 |
|
|
* connect support comes in.
|
984 |
|
|
*/
|
985 |
|
|
/* BUG: We do not implement the equivalent of wait_for_tcp_memory(). */
|
986 |
|
|
|
987 |
|
|
SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
|
988 |
|
|
|
989 |
|
|
SCTP_STATIC int sctp_sendmsg(struct sock *sk, struct msghdr *msg, int msg_len)
|
990 |
|
|
{
|
991 |
|
|
struct sctp_opt *sp;
|
992 |
|
|
struct sctp_endpoint *ep;
|
993 |
|
|
struct sctp_association *new_asoc=NULL, *asoc=NULL;
|
994 |
|
|
struct sctp_transport *transport, *chunk_tp;
|
995 |
|
|
struct sctp_chunk *chunk;
|
996 |
|
|
union sctp_addr to;
|
997 |
|
|
struct sockaddr *msg_name = NULL;
|
998 |
|
|
struct sctp_sndrcvinfo default_sinfo = { 0 };
|
999 |
|
|
struct sctp_sndrcvinfo *sinfo;
|
1000 |
|
|
struct sctp_initmsg *sinit;
|
1001 |
|
|
sctp_assoc_t associd = NULL;
|
1002 |
|
|
sctp_cmsgs_t cmsgs = { 0 };
|
1003 |
|
|
int err;
|
1004 |
|
|
sctp_scope_t scope;
|
1005 |
|
|
long timeo;
|
1006 |
|
|
__u16 sinfo_flags = 0;
|
1007 |
|
|
struct sctp_datamsg *datamsg;
|
1008 |
|
|
struct list_head *pos;
|
1009 |
|
|
int msg_flags = msg->msg_flags;
|
1010 |
|
|
|
1011 |
|
|
SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %u)\n",
|
1012 |
|
|
sk, msg, msg_len);
|
1013 |
|
|
|
1014 |
|
|
err = 0;
|
1015 |
|
|
sp = sctp_sk(sk);
|
1016 |
|
|
ep = sp->ep;
|
1017 |
|
|
|
1018 |
|
|
SCTP_DEBUG_PRINTK("Using endpoint: %s.\n", ep->debug_name);
|
1019 |
|
|
|
1020 |
|
|
/* We cannot send a message over a TCP-style listening socket. */
|
1021 |
|
|
if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
|
1022 |
|
|
err = -EPIPE;
|
1023 |
|
|
goto out_nounlock;
|
1024 |
|
|
}
|
1025 |
|
|
|
1026 |
|
|
/* Parse out the SCTP CMSGs. */
|
1027 |
|
|
err = sctp_msghdr_parse(msg, &cmsgs);
|
1028 |
|
|
|
1029 |
|
|
if (err) {
|
1030 |
|
|
SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
|
1031 |
|
|
goto out_nounlock;
|
1032 |
|
|
}
|
1033 |
|
|
|
1034 |
|
|
/* Fetch the destination address for this packet. This
|
1035 |
|
|
* address only selects the association--it is not necessarily
|
1036 |
|
|
* the address we will send to.
|
1037 |
|
|
* For a peeled-off socket, msg_name is ignored.
|
1038 |
|
|
*/
|
1039 |
|
|
if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
|
1040 |
|
|
int msg_namelen = msg->msg_namelen;
|
1041 |
|
|
|
1042 |
|
|
err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
|
1043 |
|
|
msg_namelen);
|
1044 |
|
|
if (err)
|
1045 |
|
|
return err;
|
1046 |
|
|
|
1047 |
|
|
if (msg_namelen > sizeof(to))
|
1048 |
|
|
msg_namelen = sizeof(to);
|
1049 |
|
|
memcpy(&to, msg->msg_name, msg_namelen);
|
1050 |
|
|
SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
|
1051 |
|
|
"0x%x:%u.\n",
|
1052 |
|
|
to.v4.sin_addr.s_addr, to.v4.sin_port);
|
1053 |
|
|
|
1054 |
|
|
to.v4.sin_port = ntohs(to.v4.sin_port);
|
1055 |
|
|
msg_name = msg->msg_name;
|
1056 |
|
|
}
|
1057 |
|
|
|
1058 |
|
|
sinfo = cmsgs.info;
|
1059 |
|
|
sinit = cmsgs.init;
|
1060 |
|
|
|
1061 |
|
|
/* Did the user specify SNDRCVINFO? */
|
1062 |
|
|
if (sinfo) {
|
1063 |
|
|
sinfo_flags = sinfo->sinfo_flags;
|
1064 |
|
|
associd = sinfo->sinfo_assoc_id;
|
1065 |
|
|
}
|
1066 |
|
|
|
1067 |
|
|
SCTP_DEBUG_PRINTK("msg_len: %u, sinfo_flags: 0x%x\n",
|
1068 |
|
|
msg_len, sinfo_flags);
|
1069 |
|
|
|
1070 |
|
|
/* MSG_EOF or MSG_ABORT cannot be set on a TCP-style socket. */
|
1071 |
|
|
if (sctp_style(sk, TCP) && (sinfo_flags & (MSG_EOF | MSG_ABORT))) {
|
1072 |
|
|
err = -EINVAL;
|
1073 |
|
|
goto out_nounlock;
|
1074 |
|
|
}
|
1075 |
|
|
|
1076 |
|
|
/* If MSG_EOF is set, no data can be sent. Disallow sending zero
|
1077 |
|
|
* length messages when MSG_EOF|MSG_ABORT is not set.
|
1078 |
|
|
* If MSG_ABORT is set, the message length could be non zero with
|
1079 |
|
|
* the msg_iov set to the user abort reason.
|
1080 |
|
|
*/
|
1081 |
|
|
if (((sinfo_flags & MSG_EOF) && (msg_len > 0)) ||
|
1082 |
|
|
(!(sinfo_flags & (MSG_EOF|MSG_ABORT)) && (msg_len == 0))) {
|
1083 |
|
|
err = -EINVAL;
|
1084 |
|
|
goto out_nounlock;
|
1085 |
|
|
}
|
1086 |
|
|
|
1087 |
|
|
/* If MSG_ADDR_OVER is set, there must be an address
|
1088 |
|
|
* specified in msg_name.
|
1089 |
|
|
*/
|
1090 |
|
|
if ((sinfo_flags & MSG_ADDR_OVER) && (!msg->msg_name)) {
|
1091 |
|
|
err = -EINVAL;
|
1092 |
|
|
goto out_nounlock;
|
1093 |
|
|
}
|
1094 |
|
|
|
1095 |
|
|
transport = NULL;
|
1096 |
|
|
|
1097 |
|
|
SCTP_DEBUG_PRINTK("About to look up association.\n");
|
1098 |
|
|
|
1099 |
|
|
sctp_lock_sock(sk);
|
1100 |
|
|
|
1101 |
|
|
/* If a msg_name has been specified, assume this is to be used. */
|
1102 |
|
|
if (msg_name) {
|
1103 |
|
|
/* Look for a matching association on the endpoint. */
|
1104 |
|
|
asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
|
1105 |
|
|
if (!asoc) {
|
1106 |
|
|
/* If we could not find a matching association on the
|
1107 |
|
|
* endpoint, make sure that it is not a TCP-style
|
1108 |
|
|
* socket that already has an association or there is
|
1109 |
|
|
* no peeled-off association on another socket.
|
1110 |
|
|
*/
|
1111 |
|
|
if ((sctp_style(sk, TCP) &&
|
1112 |
|
|
sctp_sstate(sk, ESTABLISHED)) ||
|
1113 |
|
|
sctp_endpoint_is_peeled_off(ep, &to)) {
|
1114 |
|
|
err = -EADDRNOTAVAIL;
|
1115 |
|
|
goto out_unlock;
|
1116 |
|
|
}
|
1117 |
|
|
}
|
1118 |
|
|
} else {
|
1119 |
|
|
asoc = sctp_id2assoc(sk, associd);
|
1120 |
|
|
if (!asoc) {
|
1121 |
|
|
err = -EPIPE;
|
1122 |
|
|
goto out_unlock;
|
1123 |
|
|
}
|
1124 |
|
|
}
|
1125 |
|
|
|
1126 |
|
|
if (asoc) {
|
1127 |
|
|
SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
|
1128 |
|
|
|
1129 |
|
|
/* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
|
1130 |
|
|
* socket that has an association in CLOSED state. This can
|
1131 |
|
|
* happen when an accepted socket has an association that is
|
1132 |
|
|
* already CLOSED.
|
1133 |
|
|
*/
|
1134 |
|
|
if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
|
1135 |
|
|
err = -EPIPE;
|
1136 |
|
|
goto out_unlock;
|
1137 |
|
|
}
|
1138 |
|
|
|
1139 |
|
|
if (sinfo_flags & MSG_EOF) {
|
1140 |
|
|
SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
|
1141 |
|
|
asoc);
|
1142 |
|
|
sctp_primitive_SHUTDOWN(asoc, NULL);
|
1143 |
|
|
err = 0;
|
1144 |
|
|
goto out_unlock;
|
1145 |
|
|
}
|
1146 |
|
|
if (sinfo_flags & MSG_ABORT) {
|
1147 |
|
|
SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
|
1148 |
|
|
sctp_primitive_ABORT(asoc, msg);
|
1149 |
|
|
err = 0;
|
1150 |
|
|
goto out_unlock;
|
1151 |
|
|
}
|
1152 |
|
|
}
|
1153 |
|
|
|
1154 |
|
|
/* Do we need to create the association? */
|
1155 |
|
|
if (!asoc) {
|
1156 |
|
|
SCTP_DEBUG_PRINTK("There is no association yet.\n");
|
1157 |
|
|
|
1158 |
|
|
/* Check for invalid stream against the stream counts,
|
1159 |
|
|
* either the default or the user specified stream counts.
|
1160 |
|
|
*/
|
1161 |
|
|
if (sinfo) {
|
1162 |
|
|
if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
|
1163 |
|
|
/* Check against the defaults. */
|
1164 |
|
|
if (sinfo->sinfo_stream >=
|
1165 |
|
|
sp->initmsg.sinit_num_ostreams) {
|
1166 |
|
|
err = -EINVAL;
|
1167 |
|
|
goto out_unlock;
|
1168 |
|
|
}
|
1169 |
|
|
} else {
|
1170 |
|
|
/* Check against the requested. */
|
1171 |
|
|
if (sinfo->sinfo_stream >=
|
1172 |
|
|
sinit->sinit_num_ostreams) {
|
1173 |
|
|
err = -EINVAL;
|
1174 |
|
|
goto out_unlock;
|
1175 |
|
|
}
|
1176 |
|
|
}
|
1177 |
|
|
}
|
1178 |
|
|
|
1179 |
|
|
/*
|
1180 |
|
|
* API 3.1.2 bind() - UDP Style Syntax
|
1181 |
|
|
* If a bind() or sctp_bindx() is not called prior to a
|
1182 |
|
|
* sendmsg() call that initiates a new association, the
|
1183 |
|
|
* system picks an ephemeral port and will choose an address
|
1184 |
|
|
* set equivalent to binding with a wildcard address.
|
1185 |
|
|
*/
|
1186 |
|
|
if (!ep->base.bind_addr.port) {
|
1187 |
|
|
if (sctp_autobind(sk)) {
|
1188 |
|
|
err = -EAGAIN;
|
1189 |
|
|
goto out_unlock;
|
1190 |
|
|
}
|
1191 |
|
|
}
|
1192 |
|
|
|
1193 |
|
|
scope = sctp_scope(&to);
|
1194 |
|
|
new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
|
1195 |
|
|
if (!new_asoc) {
|
1196 |
|
|
err = -ENOMEM;
|
1197 |
|
|
goto out_unlock;
|
1198 |
|
|
}
|
1199 |
|
|
asoc = new_asoc;
|
1200 |
|
|
|
1201 |
|
|
/* If the SCTP_INIT ancillary data is specified, set all
|
1202 |
|
|
* the association init values accordingly.
|
1203 |
|
|
*/
|
1204 |
|
|
if (sinit) {
|
1205 |
|
|
if (sinit->sinit_num_ostreams) {
|
1206 |
|
|
asoc->c.sinit_num_ostreams =
|
1207 |
|
|
sinit->sinit_num_ostreams;
|
1208 |
|
|
}
|
1209 |
|
|
if (sinit->sinit_max_instreams) {
|
1210 |
|
|
asoc->c.sinit_max_instreams =
|
1211 |
|
|
sinit->sinit_max_instreams;
|
1212 |
|
|
}
|
1213 |
|
|
if (sinit->sinit_max_attempts) {
|
1214 |
|
|
asoc->max_init_attempts
|
1215 |
|
|
= sinit->sinit_max_attempts;
|
1216 |
|
|
}
|
1217 |
|
|
if (sinit->sinit_max_init_timeo) {
|
1218 |
|
|
asoc->max_init_timeo =
|
1219 |
|
|
SCTP_MSECS_TO_JIFFIES(sinit->sinit_max_init_timeo);
|
1220 |
|
|
}
|
1221 |
|
|
}
|
1222 |
|
|
|
1223 |
|
|
/* Prime the peer's transport structures. */
|
1224 |
|
|
transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL);
|
1225 |
|
|
if (!transport) {
|
1226 |
|
|
err = -ENOMEM;
|
1227 |
|
|
goto out_free;
|
1228 |
|
|
}
|
1229 |
|
|
err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
|
1230 |
|
|
if (err < 0) {
|
1231 |
|
|
err = -ENOMEM;
|
1232 |
|
|
goto out_free;
|
1233 |
|
|
}
|
1234 |
|
|
}
|
1235 |
|
|
|
1236 |
|
|
/* ASSERT: we have a valid association at this point. */
|
1237 |
|
|
SCTP_DEBUG_PRINTK("We have a valid association.\n");
|
1238 |
|
|
|
1239 |
|
|
if (!sinfo) {
|
1240 |
|
|
/* If the user didn't specify SNDRCVINFO, make up one with
|
1241 |
|
|
* some defaults.
|
1242 |
|
|
*/
|
1243 |
|
|
default_sinfo.sinfo_stream = asoc->default_stream;
|
1244 |
|
|
default_sinfo.sinfo_flags = asoc->default_flags;
|
1245 |
|
|
default_sinfo.sinfo_ppid = asoc->default_ppid;
|
1246 |
|
|
default_sinfo.sinfo_context = asoc->default_context;
|
1247 |
|
|
default_sinfo.sinfo_timetolive = asoc->default_timetolive;
|
1248 |
|
|
default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
|
1249 |
|
|
sinfo = &default_sinfo;
|
1250 |
|
|
}
|
1251 |
|
|
|
1252 |
|
|
/* API 7.1.7, the sndbuf size per association bounds the
|
1253 |
|
|
* maximum size of data that can be sent in a single send call.
|
1254 |
|
|
*/
|
1255 |
|
|
if (msg_len > sk->sk_sndbuf) {
|
1256 |
|
|
err = -EMSGSIZE;
|
1257 |
|
|
goto out_free;
|
1258 |
|
|
}
|
1259 |
|
|
|
1260 |
|
|
/* If fragmentation is disabled and the message length exceeds the
|
1261 |
|
|
* association fragmentation point, return EMSGSIZE. The I-D
|
1262 |
|
|
* does not specify what this error is, but this looks like
|
1263 |
|
|
* a great fit.
|
1264 |
|
|
*/
|
1265 |
|
|
if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
|
1266 |
|
|
err = -EMSGSIZE;
|
1267 |
|
|
goto out_free;
|
1268 |
|
|
}
|
1269 |
|
|
|
1270 |
|
|
if (sinfo) {
|
1271 |
|
|
/* Check for invalid stream. */
|
1272 |
|
|
if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
|
1273 |
|
|
err = -EINVAL;
|
1274 |
|
|
goto out_free;
|
1275 |
|
|
}
|
1276 |
|
|
}
|
1277 |
|
|
|
1278 |
|
|
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
1279 |
|
|
if (!sctp_wspace(asoc)) {
|
1280 |
|
|
err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
|
1281 |
|
|
if (err)
|
1282 |
|
|
goto out_free;
|
1283 |
|
|
}
|
1284 |
|
|
|
1285 |
|
|
/* If an address is passed with the sendto/sendmsg call, it is used
|
1286 |
|
|
* to override the primary destination address in the TCP model, or
|
1287 |
|
|
* when MSG_ADDR_OVER flag is set in the UDP model.
|
1288 |
|
|
*/
|
1289 |
|
|
if ((sctp_style(sk, TCP) && msg_name) ||
|
1290 |
|
|
(sinfo_flags & MSG_ADDR_OVER)) {
|
1291 |
|
|
chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
|
1292 |
|
|
if (!chunk_tp) {
|
1293 |
|
|
err = -EINVAL;
|
1294 |
|
|
goto out_free;
|
1295 |
|
|
}
|
1296 |
|
|
} else
|
1297 |
|
|
chunk_tp = NULL;
|
1298 |
|
|
|
1299 |
|
|
/* Auto-connect, if we aren't connected already. */
|
1300 |
|
|
if (sctp_state(asoc, CLOSED)) {
|
1301 |
|
|
err = sctp_primitive_ASSOCIATE(asoc, NULL);
|
1302 |
|
|
if (err < 0)
|
1303 |
|
|
goto out_free;
|
1304 |
|
|
SCTP_DEBUG_PRINTK("We associated primitively.\n");
|
1305 |
|
|
}
|
1306 |
|
|
|
1307 |
|
|
/* Break the message into multiple chunks of maximum size. */
|
1308 |
|
|
datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
|
1309 |
|
|
if (!datamsg) {
|
1310 |
|
|
err = -ENOMEM;
|
1311 |
|
|
goto out_free;
|
1312 |
|
|
}
|
1313 |
|
|
|
1314 |
|
|
/* Now send the (possibly) fragmented message. */
|
1315 |
|
|
list_for_each(pos, &datamsg->chunks) {
|
1316 |
|
|
chunk = list_entry(pos, struct sctp_chunk, frag_list);
|
1317 |
|
|
sctp_datamsg_track(chunk);
|
1318 |
|
|
|
1319 |
|
|
/* Do accounting for the write space. */
|
1320 |
|
|
sctp_set_owner_w(chunk);
|
1321 |
|
|
|
1322 |
|
|
chunk->transport = chunk_tp;
|
1323 |
|
|
|
1324 |
|
|
/* Send it to the lower layers. Note: all chunks
|
1325 |
|
|
* must either fail or succeed. The lower layer
|
1326 |
|
|
* works that way today. Keep it that way or this
|
1327 |
|
|
* breaks.
|
1328 |
|
|
*/
|
1329 |
|
|
err = sctp_primitive_SEND(asoc, chunk);
|
1330 |
|
|
/* Did the lower layer accept the chunk? */
|
1331 |
|
|
if (err)
|
1332 |
|
|
sctp_chunk_free(chunk);
|
1333 |
|
|
SCTP_DEBUG_PRINTK("We sent primitively.\n");
|
1334 |
|
|
}
|
1335 |
|
|
|
1336 |
|
|
sctp_datamsg_free(datamsg);
|
1337 |
|
|
if (err)
|
1338 |
|
|
goto out_free;
|
1339 |
|
|
else
|
1340 |
|
|
err = msg_len;
|
1341 |
|
|
|
1342 |
|
|
/* If we are already past ASSOCIATE, the lower
|
1343 |
|
|
* layers are responsible for association cleanup.
|
1344 |
|
|
*/
|
1345 |
|
|
goto out_unlock;
|
1346 |
|
|
|
1347 |
|
|
out_free:
|
1348 |
|
|
if (new_asoc)
|
1349 |
|
|
sctp_association_free(asoc);
|
1350 |
|
|
out_unlock:
|
1351 |
|
|
sctp_release_sock(sk);
|
1352 |
|
|
|
1353 |
|
|
out_nounlock:
|
1354 |
|
|
return sctp_error(sk, msg_flags, err);
|
1355 |
|
|
|
1356 |
|
|
#if 0
|
1357 |
|
|
do_sock_err:
|
1358 |
|
|
if (msg_len)
|
1359 |
|
|
err = msg_len;
|
1360 |
|
|
else
|
1361 |
|
|
err = sock_error(sk);
|
1362 |
|
|
goto out;
|
1363 |
|
|
|
1364 |
|
|
do_interrupted:
|
1365 |
|
|
if (msg_len)
|
1366 |
|
|
err = msg_len;
|
1367 |
|
|
goto out;
|
1368 |
|
|
#endif /* 0 */
|
1369 |
|
|
}
|
1370 |
|
|
|
1371 |
|
|
/* This is an extended version of skb_pull() that removes the data from the
|
1372 |
|
|
* start of a skb even when data is spread across the list of skb's in the
|
1373 |
|
|
* frag_list. len specifies the total amount of data that needs to be removed.
|
1374 |
|
|
* when 'len' bytes could be removed from the skb, it returns 0.
|
1375 |
|
|
* If 'len' exceeds the total skb length, it returns the no. of bytes that
|
1376 |
|
|
* could not be removed.
|
1377 |
|
|
*/
|
1378 |
|
|
static int sctp_skb_pull(struct sk_buff *skb, int len)
|
1379 |
|
|
{
|
1380 |
|
|
struct sk_buff *list;
|
1381 |
|
|
int skb_len = skb_headlen(skb);
|
1382 |
|
|
int rlen;
|
1383 |
|
|
|
1384 |
|
|
if (len <= skb_len) {
|
1385 |
|
|
__skb_pull(skb, len);
|
1386 |
|
|
return 0;
|
1387 |
|
|
}
|
1388 |
|
|
len -= skb_len;
|
1389 |
|
|
__skb_pull(skb, skb_len);
|
1390 |
|
|
|
1391 |
|
|
for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
|
1392 |
|
|
rlen = sctp_skb_pull(list, len);
|
1393 |
|
|
skb->len -= (len-rlen);
|
1394 |
|
|
skb->data_len -= (len-rlen);
|
1395 |
|
|
|
1396 |
|
|
if (!rlen)
|
1397 |
|
|
return 0;
|
1398 |
|
|
|
1399 |
|
|
len = rlen;
|
1400 |
|
|
}
|
1401 |
|
|
|
1402 |
|
|
return len;
|
1403 |
|
|
}
|
1404 |
|
|
|
1405 |
|
|
/* API 3.1.3 recvmsg() - UDP Style Syntax
|
1406 |
|
|
*
|
1407 |
|
|
* ssize_t recvmsg(int socket, struct msghdr *message,
|
1408 |
|
|
* int flags);
|
1409 |
|
|
*
|
1410 |
|
|
* socket - the socket descriptor of the endpoint.
|
1411 |
|
|
* message - pointer to the msghdr structure which contains a single
|
1412 |
|
|
* user message and possibly some ancillary data.
|
1413 |
|
|
*
|
1414 |
|
|
* See Section 5 for complete description of the data
|
1415 |
|
|
* structures.
|
1416 |
|
|
*
|
1417 |
|
|
* flags - flags sent or received with the user message, see Section
|
1418 |
|
|
* 5 for complete description of the flags.
|
1419 |
|
|
*/
|
1420 |
|
|
static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
|
1421 |
|
|
|
1422 |
|
|
SCTP_STATIC int sctp_recvmsg(struct sock *sk, struct msghdr *msg, int len,
|
1423 |
|
|
int noblock, int flags, int *addr_len)
|
1424 |
|
|
{
|
1425 |
|
|
struct sctp_ulpevent *event = NULL;
|
1426 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1427 |
|
|
struct sk_buff *skb;
|
1428 |
|
|
int copied;
|
1429 |
|
|
int err = 0;
|
1430 |
|
|
int skb_len;
|
1431 |
|
|
|
1432 |
|
|
SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %d, %s: %d, %s: "
|
1433 |
|
|
"0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
|
1434 |
|
|
"len", len, "knoblauch", noblock,
|
1435 |
|
|
"flags", flags, "addr_len", addr_len);
|
1436 |
|
|
|
1437 |
|
|
sctp_lock_sock(sk);
|
1438 |
|
|
|
1439 |
|
|
if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
|
1440 |
|
|
err = -ENOTCONN;
|
1441 |
|
|
goto out;
|
1442 |
|
|
}
|
1443 |
|
|
|
1444 |
|
|
skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
|
1445 |
|
|
if (!skb)
|
1446 |
|
|
goto out;
|
1447 |
|
|
|
1448 |
|
|
/* Get the total length of the skb including any skb's in the
|
1449 |
|
|
* frag_list.
|
1450 |
|
|
*/
|
1451 |
|
|
skb_len = skb->len;
|
1452 |
|
|
|
1453 |
|
|
copied = skb_len;
|
1454 |
|
|
if (copied > len)
|
1455 |
|
|
copied = len;
|
1456 |
|
|
|
1457 |
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
1458 |
|
|
|
1459 |
|
|
event = sctp_skb2event(skb);
|
1460 |
|
|
|
1461 |
|
|
if (err)
|
1462 |
|
|
goto out_free;
|
1463 |
|
|
|
1464 |
|
|
sock_recv_timestamp(msg, sk, skb);
|
1465 |
|
|
if (sctp_ulpevent_is_notification(event)) {
|
1466 |
|
|
msg->msg_flags |= MSG_NOTIFICATION;
|
1467 |
|
|
sp->pf->event_msgname(event, msg->msg_name, addr_len);
|
1468 |
|
|
} else {
|
1469 |
|
|
sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
|
1470 |
|
|
}
|
1471 |
|
|
|
1472 |
|
|
/* Check if we allow SCTP_SNDRCVINFO. */
|
1473 |
|
|
if (sp->subscribe.sctp_data_io_event)
|
1474 |
|
|
sctp_ulpevent_read_sndrcvinfo(event, msg);
|
1475 |
|
|
#if 0
|
1476 |
|
|
/* FIXME: we should be calling IP/IPv6 layers. */
|
1477 |
|
|
if (sk->sk_protinfo.af_inet.cmsg_flags)
|
1478 |
|
|
ip_cmsg_recv(msg, skb);
|
1479 |
|
|
#endif
|
1480 |
|
|
|
1481 |
|
|
err = copied;
|
1482 |
|
|
|
1483 |
|
|
/* If skb's length exceeds the user's buffer, update the skb and
|
1484 |
|
|
* push it back to the receive_queue so that the next call to
|
1485 |
|
|
* recvmsg() will return the remaining data. Don't set MSG_EOR.
|
1486 |
|
|
*/
|
1487 |
|
|
if (skb_len > copied) {
|
1488 |
|
|
msg->msg_flags &= ~MSG_EOR;
|
1489 |
|
|
if (flags & MSG_PEEK)
|
1490 |
|
|
goto out_free;
|
1491 |
|
|
sctp_skb_pull(skb, copied);
|
1492 |
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
1493 |
|
|
|
1494 |
|
|
/* When only partial message is copied to the user, increase
|
1495 |
|
|
* rwnd by that amount. If all the data in the skb is read,
|
1496 |
|
|
* rwnd is updated when the event is freed.
|
1497 |
|
|
*/
|
1498 |
|
|
sctp_assoc_rwnd_increase(event->sndrcvinfo.sinfo_assoc_id,
|
1499 |
|
|
copied);
|
1500 |
|
|
goto out;
|
1501 |
|
|
} else if ((event->msg_flags & MSG_NOTIFICATION) ||
|
1502 |
|
|
(event->msg_flags & MSG_EOR))
|
1503 |
|
|
msg->msg_flags |= MSG_EOR;
|
1504 |
|
|
else
|
1505 |
|
|
msg->msg_flags &= ~MSG_EOR;
|
1506 |
|
|
|
1507 |
|
|
out_free:
|
1508 |
|
|
if (flags & MSG_PEEK) {
|
1509 |
|
|
/* Release the skb reference acquired after peeking the skb in
|
1510 |
|
|
* sctp_skb_recv_datagram().
|
1511 |
|
|
*/
|
1512 |
|
|
kfree_skb(skb);
|
1513 |
|
|
} else {
|
1514 |
|
|
/* Free the event which includes releasing the reference to
|
1515 |
|
|
* the owner of the skb, freeing the skb and updating the
|
1516 |
|
|
* rwnd.
|
1517 |
|
|
*/
|
1518 |
|
|
sctp_ulpevent_free(event);
|
1519 |
|
|
}
|
1520 |
|
|
out:
|
1521 |
|
|
sctp_release_sock(sk);
|
1522 |
|
|
return err;
|
1523 |
|
|
}
|
1524 |
|
|
|
1525 |
|
|
/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
|
1526 |
|
|
*
|
1527 |
|
|
* This option is a on/off flag. If enabled no SCTP message
|
1528 |
|
|
* fragmentation will be performed. Instead if a message being sent
|
1529 |
|
|
* exceeds the current PMTU size, the message will NOT be sent and
|
1530 |
|
|
* instead a error will be indicated to the user.
|
1531 |
|
|
*/
|
1532 |
|
|
static int sctp_setsockopt_disable_fragments(struct sock *sk,
|
1533 |
|
|
char *optval, int optlen)
|
1534 |
|
|
{
|
1535 |
|
|
int val;
|
1536 |
|
|
|
1537 |
|
|
if (optlen < sizeof(int))
|
1538 |
|
|
return -EINVAL;
|
1539 |
|
|
|
1540 |
|
|
if (get_user(val, (int *)optval))
|
1541 |
|
|
return -EFAULT;
|
1542 |
|
|
|
1543 |
|
|
sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
|
1544 |
|
|
|
1545 |
|
|
return 0;
|
1546 |
|
|
}
|
1547 |
|
|
|
1548 |
|
|
static int sctp_setsockopt_events(struct sock *sk, char *optval,
|
1549 |
|
|
int optlen)
|
1550 |
|
|
{
|
1551 |
|
|
if (optlen != sizeof(struct sctp_event_subscribe))
|
1552 |
|
|
return -EINVAL;
|
1553 |
|
|
if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
|
1554 |
|
|
return -EFAULT;
|
1555 |
|
|
return 0;
|
1556 |
|
|
}
|
1557 |
|
|
|
1558 |
|
|
/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
|
1559 |
|
|
*
|
1560 |
|
|
* This socket option is applicable to the UDP-style socket only. When
|
1561 |
|
|
* set it will cause associations that are idle for more than the
|
1562 |
|
|
* specified number of seconds to automatically close. An association
|
1563 |
|
|
* being idle is defined an association that has NOT sent or received
|
1564 |
|
|
* user data. The special value of '0' indicates that no automatic
|
1565 |
|
|
* close of any associations should be performed. The option expects an
|
1566 |
|
|
* integer defining the number of seconds of idle time before an
|
1567 |
|
|
* association is closed.
|
1568 |
|
|
*/
|
1569 |
|
|
static int sctp_setsockopt_autoclose(struct sock *sk, char *optval,
|
1570 |
|
|
int optlen)
|
1571 |
|
|
{
|
1572 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1573 |
|
|
|
1574 |
|
|
/* Applicable to UDP-style socket only */
|
1575 |
|
|
if (sctp_style(sk, TCP))
|
1576 |
|
|
return -EOPNOTSUPP;
|
1577 |
|
|
if (optlen != sizeof(int))
|
1578 |
|
|
return -EINVAL;
|
1579 |
|
|
if (copy_from_user(&sp->autoclose, optval, optlen))
|
1580 |
|
|
return -EFAULT;
|
1581 |
|
|
|
1582 |
|
|
sp->ep->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sp->autoclose * HZ;
|
1583 |
|
|
return 0;
|
1584 |
|
|
}
|
1585 |
|
|
|
1586 |
|
|
/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
|
1587 |
|
|
*
|
1588 |
|
|
* Applications can enable or disable heartbeats for any peer address of
|
1589 |
|
|
* an association, modify an address's heartbeat interval, force a
|
1590 |
|
|
* heartbeat to be sent immediately, and adjust the address's maximum
|
1591 |
|
|
* number of retransmissions sent before an address is considered
|
1592 |
|
|
* unreachable. The following structure is used to access and modify an
|
1593 |
|
|
* address's parameters:
|
1594 |
|
|
*
|
1595 |
|
|
* struct sctp_paddrparams {
|
1596 |
|
|
* sctp_assoc_t spp_assoc_id;
|
1597 |
|
|
* struct sockaddr_storage spp_address;
|
1598 |
|
|
* uint32_t spp_hbinterval;
|
1599 |
|
|
* uint16_t spp_pathmaxrxt;
|
1600 |
|
|
* };
|
1601 |
|
|
*
|
1602 |
|
|
* spp_assoc_id - (UDP style socket) This is filled in the application,
|
1603 |
|
|
* and identifies the association for this query.
|
1604 |
|
|
* spp_address - This specifies which address is of interest.
|
1605 |
|
|
* spp_hbinterval - This contains the value of the heartbeat interval,
|
1606 |
|
|
* in milliseconds. A value of 0, when modifying the
|
1607 |
|
|
* parameter, specifies that the heartbeat on this
|
1608 |
|
|
* address should be disabled. A value of UINT32_MAX
|
1609 |
|
|
* (4294967295), when modifying the parameter,
|
1610 |
|
|
* specifies that a heartbeat should be sent
|
1611 |
|
|
* immediately to the peer address, and the current
|
1612 |
|
|
* interval should remain unchanged.
|
1613 |
|
|
* spp_pathmaxrxt - This contains the maximum number of
|
1614 |
|
|
* retransmissions before this address shall be
|
1615 |
|
|
* considered unreachable.
|
1616 |
|
|
*/
|
1617 |
|
|
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
|
1618 |
|
|
char *optval, int optlen)
|
1619 |
|
|
{
|
1620 |
|
|
struct sctp_paddrparams params;
|
1621 |
|
|
struct sctp_transport *trans;
|
1622 |
|
|
int error;
|
1623 |
|
|
|
1624 |
|
|
if (optlen != sizeof(struct sctp_paddrparams))
|
1625 |
|
|
return -EINVAL;
|
1626 |
|
|
if (copy_from_user(¶ms, optval, optlen))
|
1627 |
|
|
return -EFAULT;
|
1628 |
|
|
|
1629 |
|
|
trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
|
1630 |
|
|
params.spp_assoc_id);
|
1631 |
|
|
if (!trans)
|
1632 |
|
|
return -EINVAL;
|
1633 |
|
|
|
1634 |
|
|
/* Applications can enable or disable heartbeats for any peer address
|
1635 |
|
|
* of an association, modify an address's heartbeat interval, force a
|
1636 |
|
|
* heartbeat to be sent immediately, and adjust the address's maximum
|
1637 |
|
|
* number of retransmissions sent before an address is considered
|
1638 |
|
|
* unreachable.
|
1639 |
|
|
*
|
1640 |
|
|
* The value of the heartbeat interval, in milliseconds. A value of
|
1641 |
|
|
* UINT32_MAX (4294967295), when modifying the parameter, specifies
|
1642 |
|
|
* that a heartbeat should be sent immediately to the peer address,
|
1643 |
|
|
* and the current interval should remain unchanged.
|
1644 |
|
|
*/
|
1645 |
|
|
if (0xffffffff == params.spp_hbinterval) {
|
1646 |
|
|
error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
|
1647 |
|
|
if (error)
|
1648 |
|
|
return error;
|
1649 |
|
|
} else {
|
1650 |
|
|
/* The value of the heartbeat interval, in milliseconds. A value of 0,
|
1651 |
|
|
* when modifying the parameter, specifies that the heartbeat on this
|
1652 |
|
|
* address should be disabled.
|
1653 |
|
|
*/
|
1654 |
|
|
if (params.spp_hbinterval) {
|
1655 |
|
|
trans->hb_allowed = 1;
|
1656 |
|
|
trans->hb_interval =
|
1657 |
|
|
SCTP_MSECS_TO_JIFFIES(params.spp_hbinterval);
|
1658 |
|
|
} else
|
1659 |
|
|
trans->hb_allowed = 0;
|
1660 |
|
|
}
|
1661 |
|
|
|
1662 |
|
|
/* spp_pathmaxrxt contains the maximum number of retransmissions
|
1663 |
|
|
* before this address shall be considered unreachable.
|
1664 |
|
|
*/
|
1665 |
|
|
trans->error_threshold = params.spp_pathmaxrxt;
|
1666 |
|
|
|
1667 |
|
|
return 0;
|
1668 |
|
|
}
|
1669 |
|
|
|
1670 |
|
|
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
|
1671 |
|
|
*
|
1672 |
|
|
* Applications can specify protocol parameters for the default association
|
1673 |
|
|
* initialization. The option name argument to setsockopt() and getsockopt()
|
1674 |
|
|
* is SCTP_INITMSG.
|
1675 |
|
|
*
|
1676 |
|
|
* Setting initialization parameters is effective only on an unconnected
|
1677 |
|
|
* socket (for UDP-style sockets only future associations are effected
|
1678 |
|
|
* by the change). With TCP-style sockets, this option is inherited by
|
1679 |
|
|
* sockets derived from a listener socket.
|
1680 |
|
|
*/
|
1681 |
|
|
static int sctp_setsockopt_initmsg(struct sock *sk, char *optval, int optlen)
|
1682 |
|
|
{
|
1683 |
|
|
struct sctp_initmsg sinit;
|
1684 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1685 |
|
|
|
1686 |
|
|
if (optlen != sizeof(struct sctp_initmsg))
|
1687 |
|
|
return -EINVAL;
|
1688 |
|
|
if (copy_from_user(&sinit, optval, optlen))
|
1689 |
|
|
return -EFAULT;
|
1690 |
|
|
|
1691 |
|
|
if (sinit.sinit_num_ostreams)
|
1692 |
|
|
sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
|
1693 |
|
|
if (sinit.sinit_max_instreams)
|
1694 |
|
|
sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
|
1695 |
|
|
if (sinit.sinit_max_attempts)
|
1696 |
|
|
sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
|
1697 |
|
|
if (sinit.sinit_max_init_timeo)
|
1698 |
|
|
sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
|
1699 |
|
|
|
1700 |
|
|
return 0;
|
1701 |
|
|
}
|
1702 |
|
|
|
1703 |
|
|
/*
|
1704 |
|
|
* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
|
1705 |
|
|
*
|
1706 |
|
|
* Applications that wish to use the sendto() system call may wish to
|
1707 |
|
|
* specify a default set of parameters that would normally be supplied
|
1708 |
|
|
* through the inclusion of ancillary data. This socket option allows
|
1709 |
|
|
* such an application to set the default sctp_sndrcvinfo structure.
|
1710 |
|
|
* The application that wishes to use this socket option simply passes
|
1711 |
|
|
* in to this call the sctp_sndrcvinfo structure defined in Section
|
1712 |
|
|
* 5.2.2) The input parameters accepted by this call include
|
1713 |
|
|
* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
|
1714 |
|
|
* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
|
1715 |
|
|
* to this call if the caller is using the UDP model.
|
1716 |
|
|
*/
|
1717 |
|
|
static int sctp_setsockopt_default_send_param(struct sock *sk,
|
1718 |
|
|
char *optval, int optlen)
|
1719 |
|
|
{
|
1720 |
|
|
struct sctp_sndrcvinfo info;
|
1721 |
|
|
struct sctp_association *asoc;
|
1722 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1723 |
|
|
|
1724 |
|
|
if (optlen != sizeof(struct sctp_sndrcvinfo))
|
1725 |
|
|
return -EINVAL;
|
1726 |
|
|
if (copy_from_user(&info, optval, optlen))
|
1727 |
|
|
return -EFAULT;
|
1728 |
|
|
|
1729 |
|
|
asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
|
1730 |
|
|
if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
|
1731 |
|
|
return -EINVAL;
|
1732 |
|
|
|
1733 |
|
|
if (asoc) {
|
1734 |
|
|
asoc->default_stream = info.sinfo_stream;
|
1735 |
|
|
asoc->default_flags = info.sinfo_flags;
|
1736 |
|
|
asoc->default_ppid = info.sinfo_ppid;
|
1737 |
|
|
asoc->default_context = info.sinfo_context;
|
1738 |
|
|
asoc->default_timetolive = info.sinfo_timetolive;
|
1739 |
|
|
} else {
|
1740 |
|
|
sp->default_stream = info.sinfo_stream;
|
1741 |
|
|
sp->default_flags = info.sinfo_flags;
|
1742 |
|
|
sp->default_ppid = info.sinfo_ppid;
|
1743 |
|
|
sp->default_context = info.sinfo_context;
|
1744 |
|
|
sp->default_timetolive = info.sinfo_timetolive;
|
1745 |
|
|
}
|
1746 |
|
|
|
1747 |
|
|
return 0;
|
1748 |
|
|
}
|
1749 |
|
|
|
1750 |
|
|
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
|
1751 |
|
|
*
|
1752 |
|
|
* Requests that the local SCTP stack use the enclosed peer address as
|
1753 |
|
|
* the association primary. The enclosed address must be one of the
|
1754 |
|
|
* association peer's addresses.
|
1755 |
|
|
*/
|
1756 |
|
|
static int sctp_setsockopt_primary_addr(struct sock *sk, char *optval,
|
1757 |
|
|
int optlen)
|
1758 |
|
|
{
|
1759 |
|
|
struct sctp_prim prim;
|
1760 |
|
|
struct sctp_transport *trans;
|
1761 |
|
|
|
1762 |
|
|
if (optlen != sizeof(struct sctp_prim))
|
1763 |
|
|
return -EINVAL;
|
1764 |
|
|
|
1765 |
|
|
if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
|
1766 |
|
|
return -EFAULT;
|
1767 |
|
|
|
1768 |
|
|
trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
|
1769 |
|
|
if (!trans)
|
1770 |
|
|
return -EINVAL;
|
1771 |
|
|
|
1772 |
|
|
sctp_assoc_set_primary(trans->asoc, trans);
|
1773 |
|
|
|
1774 |
|
|
return 0;
|
1775 |
|
|
}
|
1776 |
|
|
|
1777 |
|
|
/*
|
1778 |
|
|
* 7.1.5 SCTP_NODELAY
|
1779 |
|
|
*
|
1780 |
|
|
* Turn on/off any Nagle-like algorithm. This means that packets are
|
1781 |
|
|
* generally sent as soon as possible and no unnecessary delays are
|
1782 |
|
|
* introduced, at the cost of more packets in the network. Expects an
|
1783 |
|
|
* integer boolean flag.
|
1784 |
|
|
*/
|
1785 |
|
|
static int sctp_setsockopt_nodelay(struct sock *sk, char *optval,
|
1786 |
|
|
int optlen)
|
1787 |
|
|
{
|
1788 |
|
|
int val;
|
1789 |
|
|
|
1790 |
|
|
if (optlen < sizeof(int))
|
1791 |
|
|
return -EINVAL;
|
1792 |
|
|
if (get_user(val, (int *)optval))
|
1793 |
|
|
return -EFAULT;
|
1794 |
|
|
|
1795 |
|
|
sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
|
1796 |
|
|
return 0;
|
1797 |
|
|
}
|
1798 |
|
|
|
1799 |
|
|
/*
|
1800 |
|
|
*
|
1801 |
|
|
* 7.1.1 SCTP_RTOINFO
|
1802 |
|
|
*
|
1803 |
|
|
* The protocol parameters used to initialize and bound retransmission
|
1804 |
|
|
* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
|
1805 |
|
|
* and modify these parameters.
|
1806 |
|
|
* All parameters are time values, in milliseconds. A value of 0, when
|
1807 |
|
|
* modifying the parameters, indicates that the current value should not
|
1808 |
|
|
* be changed.
|
1809 |
|
|
*
|
1810 |
|
|
*/
|
1811 |
|
|
static int sctp_setsockopt_rtoinfo(struct sock *sk, char *optval, int optlen) {
|
1812 |
|
|
struct sctp_rtoinfo rtoinfo;
|
1813 |
|
|
struct sctp_association *asoc;
|
1814 |
|
|
|
1815 |
|
|
if (optlen != sizeof (struct sctp_rtoinfo))
|
1816 |
|
|
return -EINVAL;
|
1817 |
|
|
|
1818 |
|
|
if (copy_from_user(&rtoinfo, optval, optlen))
|
1819 |
|
|
return -EFAULT;
|
1820 |
|
|
|
1821 |
|
|
asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
|
1822 |
|
|
|
1823 |
|
|
/* Set the values to the specific association */
|
1824 |
|
|
if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
|
1825 |
|
|
return -EINVAL;
|
1826 |
|
|
|
1827 |
|
|
if (asoc) {
|
1828 |
|
|
if (rtoinfo.srto_initial != 0)
|
1829 |
|
|
asoc->rto_initial =
|
1830 |
|
|
SCTP_MSECS_TO_JIFFIES(rtoinfo.srto_initial);
|
1831 |
|
|
if (rtoinfo.srto_max != 0)
|
1832 |
|
|
asoc->rto_max = SCTP_MSECS_TO_JIFFIES(rtoinfo.srto_max);
|
1833 |
|
|
if (rtoinfo.srto_min != 0)
|
1834 |
|
|
asoc->rto_min = SCTP_MSECS_TO_JIFFIES(rtoinfo.srto_min);
|
1835 |
|
|
} else {
|
1836 |
|
|
/* If there is no association or the association-id = 0
|
1837 |
|
|
* set the values to the endpoint.
|
1838 |
|
|
*/
|
1839 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1840 |
|
|
|
1841 |
|
|
if (rtoinfo.srto_initial != 0)
|
1842 |
|
|
sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
|
1843 |
|
|
if (rtoinfo.srto_max != 0)
|
1844 |
|
|
sp->rtoinfo.srto_max = rtoinfo.srto_max;
|
1845 |
|
|
if (rtoinfo.srto_min != 0)
|
1846 |
|
|
sp->rtoinfo.srto_min = rtoinfo.srto_min;
|
1847 |
|
|
}
|
1848 |
|
|
|
1849 |
|
|
return 0;
|
1850 |
|
|
}
|
1851 |
|
|
|
1852 |
|
|
/*
|
1853 |
|
|
*
|
1854 |
|
|
* 7.1.2 SCTP_ASSOCINFO
|
1855 |
|
|
*
|
1856 |
|
|
* This option is used to tune the the maximum retransmission attempts
|
1857 |
|
|
* of the association.
|
1858 |
|
|
* Returns an error if the new association retransmission value is
|
1859 |
|
|
* greater than the sum of the retransmission value of the peer.
|
1860 |
|
|
* See [SCTP] for more information.
|
1861 |
|
|
*
|
1862 |
|
|
*/
|
1863 |
|
|
static int sctp_setsockopt_associnfo(struct sock *sk, char *optval, int optlen)
|
1864 |
|
|
{
|
1865 |
|
|
|
1866 |
|
|
struct sctp_assocparams assocparams;
|
1867 |
|
|
struct sctp_association *asoc;
|
1868 |
|
|
|
1869 |
|
|
if (optlen != sizeof(struct sctp_assocparams))
|
1870 |
|
|
return -EINVAL;
|
1871 |
|
|
if (copy_from_user(&assocparams, optval, optlen))
|
1872 |
|
|
return -EFAULT;
|
1873 |
|
|
|
1874 |
|
|
asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
|
1875 |
|
|
|
1876 |
|
|
if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
|
1877 |
|
|
return -EINVAL;
|
1878 |
|
|
|
1879 |
|
|
/* Set the values to the specific association */
|
1880 |
|
|
if (asoc) {
|
1881 |
|
|
if (assocparams.sasoc_asocmaxrxt != 0)
|
1882 |
|
|
asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
|
1883 |
|
|
if (assocparams.sasoc_cookie_life != 0) {
|
1884 |
|
|
asoc->cookie_life.tv_sec =
|
1885 |
|
|
assocparams.sasoc_cookie_life / 1000;
|
1886 |
|
|
asoc->cookie_life.tv_usec =
|
1887 |
|
|
(assocparams.sasoc_cookie_life % 1000)
|
1888 |
|
|
* 1000;
|
1889 |
|
|
}
|
1890 |
|
|
} else {
|
1891 |
|
|
/* Set the values to the endpoint */
|
1892 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1893 |
|
|
|
1894 |
|
|
if (assocparams.sasoc_asocmaxrxt != 0)
|
1895 |
|
|
sp->assocparams.sasoc_asocmaxrxt =
|
1896 |
|
|
assocparams.sasoc_asocmaxrxt;
|
1897 |
|
|
if (assocparams.sasoc_cookie_life != 0)
|
1898 |
|
|
sp->assocparams.sasoc_cookie_life =
|
1899 |
|
|
assocparams.sasoc_cookie_life;
|
1900 |
|
|
}
|
1901 |
|
|
return 0;
|
1902 |
|
|
}
|
1903 |
|
|
|
1904 |
|
|
/*
|
1905 |
|
|
* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
|
1906 |
|
|
*
|
1907 |
|
|
* This socket option is a boolean flag which turns on or off mapped V4
|
1908 |
|
|
* addresses. If this option is turned on and the socket is type
|
1909 |
|
|
* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
|
1910 |
|
|
* If this option is turned off, then no mapping will be done of V4
|
1911 |
|
|
* addresses and a user will receive both PF_INET6 and PF_INET type
|
1912 |
|
|
* addresses on the socket.
|
1913 |
|
|
*/
|
1914 |
|
|
static int sctp_setsockopt_mappedv4(struct sock *sk, char *optval, int optlen)
|
1915 |
|
|
{
|
1916 |
|
|
int val;
|
1917 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
1918 |
|
|
|
1919 |
|
|
if (optlen < sizeof(int))
|
1920 |
|
|
return -EINVAL;
|
1921 |
|
|
if (get_user(val, (int *)optval))
|
1922 |
|
|
return -EFAULT;
|
1923 |
|
|
if (val)
|
1924 |
|
|
sp->v4mapped = 1;
|
1925 |
|
|
else
|
1926 |
|
|
sp->v4mapped = 0;
|
1927 |
|
|
|
1928 |
|
|
return 0;
|
1929 |
|
|
}
|
1930 |
|
|
|
1931 |
|
|
/*
|
1932 |
|
|
* 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
|
1933 |
|
|
*
|
1934 |
|
|
* This socket option specifies the maximum size to put in any outgoing
|
1935 |
|
|
* SCTP chunk. If a message is larger than this size it will be
|
1936 |
|
|
* fragmented by SCTP into the specified size. Note that the underlying
|
1937 |
|
|
* SCTP implementation may fragment into smaller sized chunks when the
|
1938 |
|
|
* PMTU of the underlying association is smaller than the value set by
|
1939 |
|
|
* the user.
|
1940 |
|
|
*/
|
1941 |
|
|
static int sctp_setsockopt_maxseg(struct sock *sk, char *optval, int optlen)
|
1942 |
|
|
{
|
1943 |
|
|
int val;
|
1944 |
|
|
|
1945 |
|
|
if (optlen < sizeof(int))
|
1946 |
|
|
return -EINVAL;
|
1947 |
|
|
if (get_user(val, (int *)optval))
|
1948 |
|
|
return -EFAULT;
|
1949 |
|
|
if ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))
|
1950 |
|
|
return -EINVAL;
|
1951 |
|
|
sctp_sk(sk)->user_frag = val;
|
1952 |
|
|
|
1953 |
|
|
return 0;
|
1954 |
|
|
}
|
1955 |
|
|
|
1956 |
|
|
|
1957 |
|
|
/*
|
1958 |
|
|
* 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
|
1959 |
|
|
*
|
1960 |
|
|
* Requests that the peer mark the enclosed address as the association
|
1961 |
|
|
* primary. The enclosed address must be one of the association's
|
1962 |
|
|
* locally bound addresses. The following structure is used to make a
|
1963 |
|
|
* set primary request:
|
1964 |
|
|
*/
|
1965 |
|
|
static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char *optval,
|
1966 |
|
|
int optlen)
|
1967 |
|
|
{
|
1968 |
|
|
struct sctp_opt *sp;
|
1969 |
|
|
struct sctp_endpoint *ep;
|
1970 |
|
|
struct sctp_association *asoc = NULL;
|
1971 |
|
|
struct sctp_setpeerprim prim;
|
1972 |
|
|
struct sctp_chunk *chunk;
|
1973 |
|
|
int err;
|
1974 |
|
|
|
1975 |
|
|
sp = sctp_sk(sk);
|
1976 |
|
|
ep = sp->ep;
|
1977 |
|
|
|
1978 |
|
|
if (!sctp_addip_enable)
|
1979 |
|
|
return -EPERM;
|
1980 |
|
|
|
1981 |
|
|
if (optlen != sizeof(struct sctp_setpeerprim))
|
1982 |
|
|
return -EINVAL;
|
1983 |
|
|
|
1984 |
|
|
if (copy_from_user(&prim, optval, optlen))
|
1985 |
|
|
return -EFAULT;
|
1986 |
|
|
|
1987 |
|
|
asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
|
1988 |
|
|
if (!asoc)
|
1989 |
|
|
return -EINVAL;
|
1990 |
|
|
|
1991 |
|
|
if (!asoc->peer.asconf_capable)
|
1992 |
|
|
return -EPERM;
|
1993 |
|
|
|
1994 |
|
|
if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
|
1995 |
|
|
return -EPERM;
|
1996 |
|
|
|
1997 |
|
|
if (!sctp_state(asoc, ESTABLISHED))
|
1998 |
|
|
return -ENOTCONN;
|
1999 |
|
|
|
2000 |
|
|
if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
|
2001 |
|
|
return -EADDRNOTAVAIL;
|
2002 |
|
|
|
2003 |
|
|
/* Create an ASCONF chunk with SET_PRIMARY parameter */
|
2004 |
|
|
chunk = sctp_make_asconf_set_prim(asoc,
|
2005 |
|
|
(union sctp_addr *)&prim.sspp_addr);
|
2006 |
|
|
if (!chunk)
|
2007 |
|
|
return -ENOMEM;
|
2008 |
|
|
|
2009 |
|
|
err = sctp_send_asconf(asoc, chunk);
|
2010 |
|
|
|
2011 |
|
|
SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
|
2012 |
|
|
|
2013 |
|
|
return err;
|
2014 |
|
|
}
|
2015 |
|
|
|
2016 |
|
|
|
2017 |
|
|
/* API 6.2 setsockopt(), getsockopt()
|
2018 |
|
|
*
|
2019 |
|
|
* Applications use setsockopt() and getsockopt() to set or retrieve
|
2020 |
|
|
* socket options. Socket options are used to change the default
|
2021 |
|
|
* behavior of sockets calls. They are described in Section 7.
|
2022 |
|
|
*
|
2023 |
|
|
* The syntax is:
|
2024 |
|
|
*
|
2025 |
|
|
* ret = getsockopt(int sd, int level, int optname, void *optval,
|
2026 |
|
|
* int *optlen);
|
2027 |
|
|
* ret = setsockopt(int sd, int level, int optname, const void *optval,
|
2028 |
|
|
* int optlen);
|
2029 |
|
|
*
|
2030 |
|
|
* sd - the socket descript.
|
2031 |
|
|
* level - set to IPPROTO_SCTP for all SCTP options.
|
2032 |
|
|
* optname - the option name.
|
2033 |
|
|
* optval - the buffer to store the value of the option.
|
2034 |
|
|
* optlen - the size of the buffer.
|
2035 |
|
|
*/
|
2036 |
|
|
SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
|
2037 |
|
|
char *optval, int optlen)
|
2038 |
|
|
{
|
2039 |
|
|
int retval = 0;
|
2040 |
|
|
|
2041 |
|
|
SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
|
2042 |
|
|
sk, optname);
|
2043 |
|
|
|
2044 |
|
|
/* I can hardly begin to describe how wrong this is. This is
|
2045 |
|
|
* so broken as to be worse than useless. The API draft
|
2046 |
|
|
* REALLY is NOT helpful here... I am not convinced that the
|
2047 |
|
|
* semantics of setsockopt() with a level OTHER THAN SOL_SCTP
|
2048 |
|
|
* are at all well-founded.
|
2049 |
|
|
*/
|
2050 |
|
|
if (level != SOL_SCTP) {
|
2051 |
|
|
struct sctp_af *af = sctp_sk(sk)->pf->af;
|
2052 |
|
|
retval = af->setsockopt(sk, level, optname, optval, optlen);
|
2053 |
|
|
goto out_nounlock;
|
2054 |
|
|
}
|
2055 |
|
|
|
2056 |
|
|
sctp_lock_sock(sk);
|
2057 |
|
|
|
2058 |
|
|
switch (optname) {
|
2059 |
|
|
case SCTP_SOCKOPT_BINDX_ADD:
|
2060 |
|
|
/* 'optlen' is the size of the addresses buffer. */
|
2061 |
|
|
retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval,
|
2062 |
|
|
optlen, SCTP_BINDX_ADD_ADDR);
|
2063 |
|
|
break;
|
2064 |
|
|
|
2065 |
|
|
case SCTP_SOCKOPT_BINDX_REM:
|
2066 |
|
|
/* 'optlen' is the size of the addresses buffer. */
|
2067 |
|
|
retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval,
|
2068 |
|
|
optlen, SCTP_BINDX_REM_ADDR);
|
2069 |
|
|
break;
|
2070 |
|
|
|
2071 |
|
|
case SCTP_DISABLE_FRAGMENTS:
|
2072 |
|
|
retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
|
2073 |
|
|
break;
|
2074 |
|
|
|
2075 |
|
|
case SCTP_EVENTS:
|
2076 |
|
|
retval = sctp_setsockopt_events(sk, optval, optlen);
|
2077 |
|
|
break;
|
2078 |
|
|
|
2079 |
|
|
case SCTP_AUTOCLOSE:
|
2080 |
|
|
retval = sctp_setsockopt_autoclose(sk, optval, optlen);
|
2081 |
|
|
break;
|
2082 |
|
|
|
2083 |
|
|
case SCTP_PEER_ADDR_PARAMS:
|
2084 |
|
|
retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
|
2085 |
|
|
break;
|
2086 |
|
|
|
2087 |
|
|
case SCTP_INITMSG:
|
2088 |
|
|
retval = sctp_setsockopt_initmsg(sk, optval, optlen);
|
2089 |
|
|
break;
|
2090 |
|
|
case SCTP_DEFAULT_SEND_PARAM:
|
2091 |
|
|
retval = sctp_setsockopt_default_send_param(sk, optval,
|
2092 |
|
|
optlen);
|
2093 |
|
|
break;
|
2094 |
|
|
case SCTP_PRIMARY_ADDR:
|
2095 |
|
|
retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
|
2096 |
|
|
break;
|
2097 |
|
|
case SCTP_SET_PEER_PRIMARY_ADDR:
|
2098 |
|
|
retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
|
2099 |
|
|
break;
|
2100 |
|
|
case SCTP_NODELAY:
|
2101 |
|
|
retval = sctp_setsockopt_nodelay(sk, optval, optlen);
|
2102 |
|
|
break;
|
2103 |
|
|
case SCTP_RTOINFO:
|
2104 |
|
|
retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
|
2105 |
|
|
break;
|
2106 |
|
|
case SCTP_ASSOCINFO:
|
2107 |
|
|
retval = sctp_setsockopt_associnfo(sk, optval, optlen);
|
2108 |
|
|
break;
|
2109 |
|
|
case SCTP_I_WANT_MAPPED_V4_ADDR:
|
2110 |
|
|
retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
|
2111 |
|
|
break;
|
2112 |
|
|
case SCTP_MAXSEG:
|
2113 |
|
|
retval = sctp_setsockopt_maxseg(sk, optval, optlen);
|
2114 |
|
|
break;
|
2115 |
|
|
default:
|
2116 |
|
|
retval = -ENOPROTOOPT;
|
2117 |
|
|
break;
|
2118 |
|
|
};
|
2119 |
|
|
|
2120 |
|
|
sctp_release_sock(sk);
|
2121 |
|
|
|
2122 |
|
|
out_nounlock:
|
2123 |
|
|
return retval;
|
2124 |
|
|
}
|
2125 |
|
|
|
2126 |
|
|
/* API 3.1.6 connect() - UDP Style Syntax
|
2127 |
|
|
*
|
2128 |
|
|
* An application may use the connect() call in the UDP model to initiate an
|
2129 |
|
|
* association without sending data.
|
2130 |
|
|
*
|
2131 |
|
|
* The syntax is:
|
2132 |
|
|
*
|
2133 |
|
|
* ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
|
2134 |
|
|
*
|
2135 |
|
|
* sd: the socket descriptor to have a new association added to.
|
2136 |
|
|
*
|
2137 |
|
|
* nam: the address structure (either struct sockaddr_in or struct
|
2138 |
|
|
* sockaddr_in6 defined in RFC2553 [7]).
|
2139 |
|
|
*
|
2140 |
|
|
* len: the size of the address.
|
2141 |
|
|
*/
|
2142 |
|
|
SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *uaddr,
|
2143 |
|
|
int addr_len)
|
2144 |
|
|
{
|
2145 |
|
|
struct sctp_opt *sp;
|
2146 |
|
|
struct sctp_endpoint *ep;
|
2147 |
|
|
struct sctp_association *asoc;
|
2148 |
|
|
struct sctp_transport *transport;
|
2149 |
|
|
union sctp_addr to;
|
2150 |
|
|
struct sctp_af *af;
|
2151 |
|
|
sctp_scope_t scope;
|
2152 |
|
|
long timeo;
|
2153 |
|
|
int err = 0;
|
2154 |
|
|
|
2155 |
|
|
sctp_lock_sock(sk);
|
2156 |
|
|
|
2157 |
|
|
SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d)\n",
|
2158 |
|
|
__FUNCTION__, sk, uaddr, addr_len);
|
2159 |
|
|
|
2160 |
|
|
sp = sctp_sk(sk);
|
2161 |
|
|
ep = sp->ep;
|
2162 |
|
|
|
2163 |
|
|
/* connect() cannot be done on a socket that is already in ESTABLISHED
|
2164 |
|
|
* state - UDP-style peeled off socket or a TCP-style socket that
|
2165 |
|
|
* is already connected.
|
2166 |
|
|
* It cannot be done even on a TCP-style listening socket.
|
2167 |
|
|
*/
|
2168 |
|
|
if (sctp_sstate(sk, ESTABLISHED) ||
|
2169 |
|
|
(sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
|
2170 |
|
|
err = -EISCONN;
|
2171 |
|
|
goto out_unlock;
|
2172 |
|
|
}
|
2173 |
|
|
|
2174 |
|
|
err = sctp_verify_addr(sk, (union sctp_addr *)uaddr, addr_len);
|
2175 |
|
|
if (err)
|
2176 |
|
|
goto out_unlock;
|
2177 |
|
|
|
2178 |
|
|
if (addr_len > sizeof(to))
|
2179 |
|
|
addr_len = sizeof(to);
|
2180 |
|
|
memcpy(&to, uaddr, addr_len);
|
2181 |
|
|
to.v4.sin_port = ntohs(to.v4.sin_port);
|
2182 |
|
|
|
2183 |
|
|
asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
|
2184 |
|
|
if (asoc) {
|
2185 |
|
|
if (asoc->state >= SCTP_STATE_ESTABLISHED)
|
2186 |
|
|
err = -EISCONN;
|
2187 |
|
|
else
|
2188 |
|
|
err = -EALREADY;
|
2189 |
|
|
goto out_unlock;
|
2190 |
|
|
}
|
2191 |
|
|
|
2192 |
|
|
/* If we could not find a matching association on the endpoint,
|
2193 |
|
|
* make sure that there is no peeled-off association matching the
|
2194 |
|
|
* peer address even on another socket.
|
2195 |
|
|
*/
|
2196 |
|
|
if (sctp_endpoint_is_peeled_off(ep, &to)) {
|
2197 |
|
|
err = -EADDRNOTAVAIL;
|
2198 |
|
|
goto out_unlock;
|
2199 |
|
|
}
|
2200 |
|
|
|
2201 |
|
|
/* If a bind() or sctp_bindx() is not called prior to a connect()
|
2202 |
|
|
* call, the system picks an ephemeral port and will choose an address
|
2203 |
|
|
* set equivalent to binding with a wildcard address.
|
2204 |
|
|
*/
|
2205 |
|
|
if (!ep->base.bind_addr.port) {
|
2206 |
|
|
if (sctp_autobind(sk)) {
|
2207 |
|
|
err = -EAGAIN;
|
2208 |
|
|
goto out_unlock;
|
2209 |
|
|
}
|
2210 |
|
|
}
|
2211 |
|
|
|
2212 |
|
|
scope = sctp_scope(&to);
|
2213 |
|
|
asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
|
2214 |
|
|
if (!asoc) {
|
2215 |
|
|
err = -ENOMEM;
|
2216 |
|
|
goto out_unlock;
|
2217 |
|
|
}
|
2218 |
|
|
|
2219 |
|
|
/* Prime the peer's transport structures. */
|
2220 |
|
|
transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL);
|
2221 |
|
|
if (!transport) {
|
2222 |
|
|
sctp_association_free(asoc);
|
2223 |
|
|
goto out_unlock;
|
2224 |
|
|
}
|
2225 |
|
|
err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
|
2226 |
|
|
if (err < 0) {
|
2227 |
|
|
sctp_association_free(asoc);
|
2228 |
|
|
goto out_unlock;
|
2229 |
|
|
}
|
2230 |
|
|
|
2231 |
|
|
err = sctp_primitive_ASSOCIATE(asoc, NULL);
|
2232 |
|
|
if (err < 0) {
|
2233 |
|
|
sctp_association_free(asoc);
|
2234 |
|
|
goto out_unlock;
|
2235 |
|
|
}
|
2236 |
|
|
|
2237 |
|
|
/* Initialize sk's dport and daddr for getpeername() */
|
2238 |
|
|
sk->dport = htons(asoc->peer.port);
|
2239 |
|
|
af = sctp_get_af_specific(to.sa.sa_family);
|
2240 |
|
|
af->to_sk_daddr(&to, sk);
|
2241 |
|
|
|
2242 |
|
|
timeo = sock_sndtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
|
2243 |
|
|
err = sctp_wait_for_connect(asoc, &timeo);
|
2244 |
|
|
|
2245 |
|
|
out_unlock:
|
2246 |
|
|
sctp_release_sock(sk);
|
2247 |
|
|
|
2248 |
|
|
return err;
|
2249 |
|
|
}
|
2250 |
|
|
|
2251 |
|
|
/* FIXME: Write comments. */
|
2252 |
|
|
SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
|
2253 |
|
|
{
|
2254 |
|
|
return -EOPNOTSUPP; /* STUB */
|
2255 |
|
|
}
|
2256 |
|
|
|
2257 |
|
|
/* 4.1.4 accept() - TCP Style Syntax
|
2258 |
|
|
*
|
2259 |
|
|
* Applications use accept() call to remove an established SCTP
|
2260 |
|
|
* association from the accept queue of the endpoint. A new socket
|
2261 |
|
|
* descriptor will be returned from accept() to represent the newly
|
2262 |
|
|
* formed association.
|
2263 |
|
|
*/
|
2264 |
|
|
SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
|
2265 |
|
|
{
|
2266 |
|
|
struct sctp_opt *sp;
|
2267 |
|
|
struct sctp_endpoint *ep;
|
2268 |
|
|
struct sock *newsk = NULL;
|
2269 |
|
|
struct sctp_association *asoc;
|
2270 |
|
|
long timeo;
|
2271 |
|
|
int error = 0;
|
2272 |
|
|
|
2273 |
|
|
sctp_lock_sock(sk);
|
2274 |
|
|
|
2275 |
|
|
sp = sctp_sk(sk);
|
2276 |
|
|
ep = sp->ep;
|
2277 |
|
|
|
2278 |
|
|
if (!sctp_style(sk, TCP)) {
|
2279 |
|
|
error = -EOPNOTSUPP;
|
2280 |
|
|
goto out;
|
2281 |
|
|
}
|
2282 |
|
|
|
2283 |
|
|
if (!sctp_sstate(sk, LISTENING)) {
|
2284 |
|
|
error = -EINVAL;
|
2285 |
|
|
goto out;
|
2286 |
|
|
}
|
2287 |
|
|
|
2288 |
|
|
timeo = sock_rcvtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
|
2289 |
|
|
|
2290 |
|
|
error = sctp_wait_for_accept(sk, timeo);
|
2291 |
|
|
if (error)
|
2292 |
|
|
goto out;
|
2293 |
|
|
|
2294 |
|
|
/* We treat the list of associations on the endpoint as the accept
|
2295 |
|
|
* queue and pick the first association on the list.
|
2296 |
|
|
*/
|
2297 |
|
|
asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
|
2298 |
|
|
|
2299 |
|
|
newsk = sp->pf->create_accept_sk(sk, asoc);
|
2300 |
|
|
if (!newsk) {
|
2301 |
|
|
error = -ENOMEM;
|
2302 |
|
|
goto out;
|
2303 |
|
|
}
|
2304 |
|
|
|
2305 |
|
|
/* Populate the fields of the newsk from the oldsk and migrate the
|
2306 |
|
|
* asoc to the newsk.
|
2307 |
|
|
*/
|
2308 |
|
|
sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
|
2309 |
|
|
|
2310 |
|
|
out:
|
2311 |
|
|
sctp_release_sock(sk);
|
2312 |
|
|
*err = error;
|
2313 |
|
|
return newsk;
|
2314 |
|
|
}
|
2315 |
|
|
|
2316 |
|
|
/* The SCTP ioctl handler. */
|
2317 |
|
|
SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
|
2318 |
|
|
{
|
2319 |
|
|
return -ENOIOCTLCMD;
|
2320 |
|
|
}
|
2321 |
|
|
|
2322 |
|
|
/* This is the function which gets called during socket creation to
|
2323 |
|
|
* initialized the SCTP-specific portion of the sock.
|
2324 |
|
|
* The sock structure should already be zero-filled memory.
|
2325 |
|
|
*/
|
2326 |
|
|
SCTP_STATIC int sctp_init_sock(struct sock *sk)
|
2327 |
|
|
{
|
2328 |
|
|
struct sctp_endpoint *ep;
|
2329 |
|
|
struct sctp_opt *sp;
|
2330 |
|
|
|
2331 |
|
|
SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
|
2332 |
|
|
|
2333 |
|
|
sp = sctp_sk(sk);
|
2334 |
|
|
|
2335 |
|
|
/* Initialize the SCTP per socket area. */
|
2336 |
|
|
switch (sk->sk_type) {
|
2337 |
|
|
case SOCK_SEQPACKET:
|
2338 |
|
|
sp->type = SCTP_SOCKET_UDP;
|
2339 |
|
|
break;
|
2340 |
|
|
case SOCK_STREAM:
|
2341 |
|
|
sp->type = SCTP_SOCKET_TCP;
|
2342 |
|
|
break;
|
2343 |
|
|
default:
|
2344 |
|
|
return -ESOCKTNOSUPPORT;
|
2345 |
|
|
}
|
2346 |
|
|
|
2347 |
|
|
/* Initialize default send parameters. These parameters can be
|
2348 |
|
|
* modified with the SCTP_DEFAULT_SEND_PARAM socket option.
|
2349 |
|
|
*/
|
2350 |
|
|
sp->default_stream = 0;
|
2351 |
|
|
sp->default_ppid = 0;
|
2352 |
|
|
sp->default_flags = 0;
|
2353 |
|
|
sp->default_context = 0;
|
2354 |
|
|
sp->default_timetolive = 0;
|
2355 |
|
|
|
2356 |
|
|
/* Initialize default setup parameters. These parameters
|
2357 |
|
|
* can be modified with the SCTP_INITMSG socket option or
|
2358 |
|
|
* overridden by the SCTP_INIT CMSG.
|
2359 |
|
|
*/
|
2360 |
|
|
sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
|
2361 |
|
|
sp->initmsg.sinit_max_instreams = sctp_max_instreams;
|
2362 |
|
|
sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
|
2363 |
|
|
sp->initmsg.sinit_max_init_timeo = JIFFIES_TO_MSECS(sctp_rto_max);
|
2364 |
|
|
|
2365 |
|
|
/* Initialize default RTO related parameters. These parameters can
|
2366 |
|
|
* be modified for with the SCTP_RTOINFO socket option.
|
2367 |
|
|
*/
|
2368 |
|
|
sp->rtoinfo.srto_initial = JIFFIES_TO_MSECS(sctp_rto_initial);
|
2369 |
|
|
sp->rtoinfo.srto_max = JIFFIES_TO_MSECS(sctp_rto_max);
|
2370 |
|
|
sp->rtoinfo.srto_min = JIFFIES_TO_MSECS(sctp_rto_min);
|
2371 |
|
|
|
2372 |
|
|
/* Initialize default association related parameters. These parameters
|
2373 |
|
|
* can be modified with the SCTP_ASSOCINFO socket option.
|
2374 |
|
|
*/
|
2375 |
|
|
sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
|
2376 |
|
|
sp->assocparams.sasoc_number_peer_destinations = 0;
|
2377 |
|
|
sp->assocparams.sasoc_peer_rwnd = 0;
|
2378 |
|
|
sp->assocparams.sasoc_local_rwnd = 0;
|
2379 |
|
|
sp->assocparams.sasoc_cookie_life =
|
2380 |
|
|
JIFFIES_TO_MSECS(sctp_valid_cookie_life);
|
2381 |
|
|
|
2382 |
|
|
/* Initialize default event subscriptions. By default, all the
|
2383 |
|
|
* options are off.
|
2384 |
|
|
*/
|
2385 |
|
|
memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
|
2386 |
|
|
|
2387 |
|
|
/* Default Peer Address Parameters. These defaults can
|
2388 |
|
|
* be modified via SCTP_PEER_ADDR_PARAMS
|
2389 |
|
|
*/
|
2390 |
|
|
sp->paddrparam.spp_hbinterval = JIFFIES_TO_MSECS(sctp_hb_interval);
|
2391 |
|
|
sp->paddrparam.spp_pathmaxrxt = sctp_max_retrans_path;
|
2392 |
|
|
|
2393 |
|
|
/* If enabled no SCTP message fragmentation will be performed.
|
2394 |
|
|
* Configure through SCTP_DISABLE_FRAGMENTS socket option.
|
2395 |
|
|
*/
|
2396 |
|
|
sp->disable_fragments = 0;
|
2397 |
|
|
|
2398 |
|
|
/* Turn on/off any Nagle-like algorithm. */
|
2399 |
|
|
sp->nodelay = 1;
|
2400 |
|
|
|
2401 |
|
|
/* Enable by default. */
|
2402 |
|
|
sp->v4mapped = 1;
|
2403 |
|
|
|
2404 |
|
|
/* Auto-close idle associations after the configured
|
2405 |
|
|
* number of seconds. A value of 0 disables this
|
2406 |
|
|
* feature. Configure through the SCTP_AUTOCLOSE socket option,
|
2407 |
|
|
* for UDP-style sockets only.
|
2408 |
|
|
*/
|
2409 |
|
|
sp->autoclose = 0;
|
2410 |
|
|
|
2411 |
|
|
/* User specified fragmentation limit. */
|
2412 |
|
|
sp->user_frag = 0;
|
2413 |
|
|
|
2414 |
|
|
sp->pf = sctp_get_pf_specific(sk->sk_family);
|
2415 |
|
|
|
2416 |
|
|
/* Control variables for partial data delivery. */
|
2417 |
|
|
sp->pd_mode = 0;
|
2418 |
|
|
skb_queue_head_init(&sp->pd_lobby);
|
2419 |
|
|
|
2420 |
|
|
/* Create a per socket endpoint structure. Even if we
|
2421 |
|
|
* change the data structure relationships, this may still
|
2422 |
|
|
* be useful for storing pre-connect address information.
|
2423 |
|
|
*/
|
2424 |
|
|
ep = sctp_endpoint_new(sk, GFP_KERNEL);
|
2425 |
|
|
if (!ep)
|
2426 |
|
|
return -ENOMEM;
|
2427 |
|
|
|
2428 |
|
|
sp->ep = ep;
|
2429 |
|
|
sp->hmac = NULL;
|
2430 |
|
|
|
2431 |
|
|
SCTP_DBG_OBJCNT_INC(sock);
|
2432 |
|
|
return 0;
|
2433 |
|
|
}
|
2434 |
|
|
|
2435 |
|
|
/* Cleanup any SCTP per socket resources. */
|
2436 |
|
|
SCTP_STATIC int sctp_destroy_sock(struct sock *sk)
|
2437 |
|
|
{
|
2438 |
|
|
struct sctp_endpoint *ep;
|
2439 |
|
|
|
2440 |
|
|
SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
|
2441 |
|
|
|
2442 |
|
|
/* Release our hold on the endpoint. */
|
2443 |
|
|
ep = sctp_sk(sk)->ep;
|
2444 |
|
|
sctp_endpoint_free(ep);
|
2445 |
|
|
|
2446 |
|
|
return 0;
|
2447 |
|
|
}
|
2448 |
|
|
|
2449 |
|
|
/* API 4.1.7 shutdown() - TCP Style Syntax
|
2450 |
|
|
* int shutdown(int socket, int how);
|
2451 |
|
|
*
|
2452 |
|
|
* sd - the socket descriptor of the association to be closed.
|
2453 |
|
|
* how - Specifies the type of shutdown. The values are
|
2454 |
|
|
* as follows:
|
2455 |
|
|
* SHUT_RD
|
2456 |
|
|
* Disables further receive operations. No SCTP
|
2457 |
|
|
* protocol action is taken.
|
2458 |
|
|
* SHUT_WR
|
2459 |
|
|
* Disables further send operations, and initiates
|
2460 |
|
|
* the SCTP shutdown sequence.
|
2461 |
|
|
* SHUT_RDWR
|
2462 |
|
|
* Disables further send and receive operations
|
2463 |
|
|
* and initiates the SCTP shutdown sequence.
|
2464 |
|
|
*/
|
2465 |
|
|
SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
|
2466 |
|
|
{
|
2467 |
|
|
struct sctp_endpoint *ep;
|
2468 |
|
|
struct sctp_association *asoc;
|
2469 |
|
|
|
2470 |
|
|
if (!sctp_style(sk, TCP))
|
2471 |
|
|
return;
|
2472 |
|
|
|
2473 |
|
|
if (how & SEND_SHUTDOWN) {
|
2474 |
|
|
ep = sctp_sk(sk)->ep;
|
2475 |
|
|
if (!list_empty(&ep->asocs)) {
|
2476 |
|
|
asoc = list_entry(ep->asocs.next,
|
2477 |
|
|
struct sctp_association, asocs);
|
2478 |
|
|
sctp_primitive_SHUTDOWN(asoc, NULL);
|
2479 |
|
|
}
|
2480 |
|
|
}
|
2481 |
|
|
}
|
2482 |
|
|
|
2483 |
|
|
/* 7.2.1 Association Status (SCTP_STATUS)
|
2484 |
|
|
|
2485 |
|
|
* Applications can retrieve current status information about an
|
2486 |
|
|
* association, including association state, peer receiver window size,
|
2487 |
|
|
* number of unacked data chunks, and number of data chunks pending
|
2488 |
|
|
* receipt. This information is read-only.
|
2489 |
|
|
*/
|
2490 |
|
|
static int sctp_getsockopt_sctp_status(struct sock *sk, int len, char *optval,
|
2491 |
|
|
int *optlen)
|
2492 |
|
|
{
|
2493 |
|
|
struct sctp_status status;
|
2494 |
|
|
struct sctp_association *asoc = NULL;
|
2495 |
|
|
struct sctp_transport *transport;
|
2496 |
|
|
sctp_assoc_t associd;
|
2497 |
|
|
int retval = 0;
|
2498 |
|
|
|
2499 |
|
|
if (len != sizeof(status)) {
|
2500 |
|
|
retval = -EINVAL;
|
2501 |
|
|
goto out;
|
2502 |
|
|
}
|
2503 |
|
|
|
2504 |
|
|
if (copy_from_user(&status, optval, sizeof(status))) {
|
2505 |
|
|
retval = -EFAULT;
|
2506 |
|
|
goto out;
|
2507 |
|
|
}
|
2508 |
|
|
|
2509 |
|
|
associd = status.sstat_assoc_id;
|
2510 |
|
|
asoc = sctp_id2assoc(sk, associd);
|
2511 |
|
|
if (!asoc) {
|
2512 |
|
|
retval = -EINVAL;
|
2513 |
|
|
goto out;
|
2514 |
|
|
}
|
2515 |
|
|
|
2516 |
|
|
transport = asoc->peer.primary_path;
|
2517 |
|
|
|
2518 |
|
|
status.sstat_assoc_id = sctp_assoc2id(asoc);
|
2519 |
|
|
status.sstat_state = asoc->state;
|
2520 |
|
|
status.sstat_rwnd = asoc->peer.rwnd;
|
2521 |
|
|
status.sstat_unackdata = asoc->unack_data;
|
2522 |
|
|
|
2523 |
|
|
status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
|
2524 |
|
|
status.sstat_instrms = asoc->c.sinit_max_instreams;
|
2525 |
|
|
status.sstat_outstrms = asoc->c.sinit_num_ostreams;
|
2526 |
|
|
/* Just in time frag_point update. */
|
2527 |
|
|
if (sctp_sk(sk)->user_frag)
|
2528 |
|
|
asoc->frag_point
|
2529 |
|
|
= min_t(int, asoc->frag_point, sctp_sk(sk)->user_frag);
|
2530 |
|
|
status.sstat_fragmentation_point = asoc->frag_point;
|
2531 |
|
|
status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
|
2532 |
|
|
memcpy(&status.sstat_primary.spinfo_address,
|
2533 |
|
|
&(transport->ipaddr), sizeof(union sctp_addr));
|
2534 |
|
|
/* Map ipv4 address into v4-mapped-on-v6 address. */
|
2535 |
|
|
sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
|
2536 |
|
|
(union sctp_addr *)&status.sstat_primary.spinfo_address);
|
2537 |
|
|
status.sstat_primary.spinfo_state = transport->active;
|
2538 |
|
|
status.sstat_primary.spinfo_cwnd = transport->cwnd;
|
2539 |
|
|
status.sstat_primary.spinfo_srtt = transport->srtt;
|
2540 |
|
|
status.sstat_primary.spinfo_rto = JIFFIES_TO_MSECS(transport->rto);
|
2541 |
|
|
status.sstat_primary.spinfo_mtu = transport->pmtu;
|
2542 |
|
|
|
2543 |
|
|
if (put_user(len, optlen)) {
|
2544 |
|
|
retval = -EFAULT;
|
2545 |
|
|
goto out;
|
2546 |
|
|
}
|
2547 |
|
|
|
2548 |
|
|
SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %p\n",
|
2549 |
|
|
len, status.sstat_state, status.sstat_rwnd,
|
2550 |
|
|
status.sstat_assoc_id);
|
2551 |
|
|
|
2552 |
|
|
if (copy_to_user(optval, &status, len)) {
|
2553 |
|
|
retval = -EFAULT;
|
2554 |
|
|
goto out;
|
2555 |
|
|
}
|
2556 |
|
|
|
2557 |
|
|
out:
|
2558 |
|
|
return (retval);
|
2559 |
|
|
}
|
2560 |
|
|
|
2561 |
|
|
|
2562 |
|
|
/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
|
2563 |
|
|
*
|
2564 |
|
|
* Applications can retrieve information about a specific peer address
|
2565 |
|
|
* of an association, including its reachability state, congestion
|
2566 |
|
|
* window, and retransmission timer values. This information is
|
2567 |
|
|
* read-only.
|
2568 |
|
|
*/
|
2569 |
|
|
static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
|
2570 |
|
|
char *optval, int *optlen)
|
2571 |
|
|
{
|
2572 |
|
|
struct sctp_paddrinfo pinfo;
|
2573 |
|
|
struct sctp_transport *transport;
|
2574 |
|
|
int retval = 0;
|
2575 |
|
|
|
2576 |
|
|
if (len != sizeof(pinfo)) {
|
2577 |
|
|
retval = -EINVAL;
|
2578 |
|
|
goto out;
|
2579 |
|
|
}
|
2580 |
|
|
|
2581 |
|
|
if (copy_from_user(&pinfo, optval, sizeof(pinfo))) {
|
2582 |
|
|
retval = -EFAULT;
|
2583 |
|
|
goto out;
|
2584 |
|
|
}
|
2585 |
|
|
|
2586 |
|
|
transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
|
2587 |
|
|
pinfo.spinfo_assoc_id);
|
2588 |
|
|
if (!transport)
|
2589 |
|
|
return -EINVAL;
|
2590 |
|
|
|
2591 |
|
|
pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
|
2592 |
|
|
pinfo.spinfo_state = transport->active;
|
2593 |
|
|
pinfo.spinfo_cwnd = transport->cwnd;
|
2594 |
|
|
pinfo.spinfo_srtt = transport->srtt;
|
2595 |
|
|
pinfo.spinfo_rto = JIFFIES_TO_MSECS(transport->rto);
|
2596 |
|
|
pinfo.spinfo_mtu = transport->pmtu;
|
2597 |
|
|
|
2598 |
|
|
if (put_user(len, optlen)) {
|
2599 |
|
|
retval = -EFAULT;
|
2600 |
|
|
goto out;
|
2601 |
|
|
}
|
2602 |
|
|
|
2603 |
|
|
if (copy_to_user(optval, &pinfo, len)) {
|
2604 |
|
|
retval = -EFAULT;
|
2605 |
|
|
goto out;
|
2606 |
|
|
}
|
2607 |
|
|
|
2608 |
|
|
out:
|
2609 |
|
|
return (retval);
|
2610 |
|
|
}
|
2611 |
|
|
|
2612 |
|
|
/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
|
2613 |
|
|
*
|
2614 |
|
|
* This option is a on/off flag. If enabled no SCTP message
|
2615 |
|
|
* fragmentation will be performed. Instead if a message being sent
|
2616 |
|
|
* exceeds the current PMTU size, the message will NOT be sent and
|
2617 |
|
|
* instead a error will be indicated to the user.
|
2618 |
|
|
*/
|
2619 |
|
|
static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
|
2620 |
|
|
char *optval, int *optlen)
|
2621 |
|
|
{
|
2622 |
|
|
int val;
|
2623 |
|
|
|
2624 |
|
|
if (len < sizeof(int))
|
2625 |
|
|
return -EINVAL;
|
2626 |
|
|
|
2627 |
|
|
len = sizeof(int);
|
2628 |
|
|
val = (sctp_sk(sk)->disable_fragments == 1);
|
2629 |
|
|
if (put_user(len, optlen))
|
2630 |
|
|
return -EFAULT;
|
2631 |
|
|
if (copy_to_user(optval, &val, len))
|
2632 |
|
|
return -EFAULT;
|
2633 |
|
|
return 0;
|
2634 |
|
|
}
|
2635 |
|
|
|
2636 |
|
|
/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
|
2637 |
|
|
*
|
2638 |
|
|
* This socket option is used to specify various notifications and
|
2639 |
|
|
* ancillary data the user wishes to receive.
|
2640 |
|
|
*/
|
2641 |
|
|
static int sctp_getsockopt_events(struct sock *sk, int len, char *optval,
|
2642 |
|
|
int *optlen)
|
2643 |
|
|
{
|
2644 |
|
|
if (len != sizeof(struct sctp_event_subscribe))
|
2645 |
|
|
return -EINVAL;
|
2646 |
|
|
if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
|
2647 |
|
|
return -EFAULT;
|
2648 |
|
|
return 0;
|
2649 |
|
|
}
|
2650 |
|
|
|
2651 |
|
|
/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
|
2652 |
|
|
*
|
2653 |
|
|
* This socket option is applicable to the UDP-style socket only. When
|
2654 |
|
|
* set it will cause associations that are idle for more than the
|
2655 |
|
|
* specified number of seconds to automatically close. An association
|
2656 |
|
|
* being idle is defined an association that has NOT sent or received
|
2657 |
|
|
* user data. The special value of '0' indicates that no automatic
|
2658 |
|
|
* close of any associations should be performed. The option expects an
|
2659 |
|
|
* integer defining the number of seconds of idle time before an
|
2660 |
|
|
* association is closed.
|
2661 |
|
|
*/
|
2662 |
|
|
static int sctp_getsockopt_autoclose(struct sock *sk, int len, char *optval, int *optlen)
|
2663 |
|
|
{
|
2664 |
|
|
/* Applicable to UDP-style socket only */
|
2665 |
|
|
if (sctp_style(sk, TCP))
|
2666 |
|
|
return -EOPNOTSUPP;
|
2667 |
|
|
if (len != sizeof(int))
|
2668 |
|
|
return -EINVAL;
|
2669 |
|
|
if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
|
2670 |
|
|
return -EFAULT;
|
2671 |
|
|
return 0;
|
2672 |
|
|
}
|
2673 |
|
|
|
2674 |
|
|
/* Helper routine to branch off an association to a new socket. */
|
2675 |
|
|
SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
|
2676 |
|
|
struct socket **sockp)
|
2677 |
|
|
{
|
2678 |
|
|
struct sock *sk = asoc->base.sk;
|
2679 |
|
|
struct socket *sock;
|
2680 |
|
|
int err = 0;
|
2681 |
|
|
|
2682 |
|
|
/* An association cannot be branched off from an already peeled-off
|
2683 |
|
|
* socket, nor is this supported for tcp style sockets.
|
2684 |
|
|
*/
|
2685 |
|
|
if (!sctp_style(sk, UDP))
|
2686 |
|
|
return -EINVAL;
|
2687 |
|
|
|
2688 |
|
|
/* Create a new socket. */
|
2689 |
|
|
err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
|
2690 |
|
|
if (err < 0)
|
2691 |
|
|
return err;
|
2692 |
|
|
|
2693 |
|
|
/* Populate the fields of the newsk from the oldsk and migrate the
|
2694 |
|
|
* asoc to the newsk.
|
2695 |
|
|
*/
|
2696 |
|
|
sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
|
2697 |
|
|
*sockp = sock;
|
2698 |
|
|
|
2699 |
|
|
return err;
|
2700 |
|
|
}
|
2701 |
|
|
|
2702 |
|
|
static int sctp_getsockopt_peeloff(struct sock *sk, int len, char *optval, int *optlen)
|
2703 |
|
|
{
|
2704 |
|
|
sctp_peeloff_arg_t peeloff;
|
2705 |
|
|
struct socket *newsock;
|
2706 |
|
|
int retval = 0;
|
2707 |
|
|
struct sctp_association *asoc;
|
2708 |
|
|
|
2709 |
|
|
if (len != sizeof(sctp_peeloff_arg_t))
|
2710 |
|
|
return -EINVAL;
|
2711 |
|
|
if (copy_from_user(&peeloff, optval, len))
|
2712 |
|
|
return -EFAULT;
|
2713 |
|
|
|
2714 |
|
|
asoc = sctp_id2assoc(sk, peeloff.associd);
|
2715 |
|
|
if (!asoc) {
|
2716 |
|
|
retval = -EINVAL;
|
2717 |
|
|
goto out;
|
2718 |
|
|
}
|
2719 |
|
|
|
2720 |
|
|
SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__, sk, asoc);
|
2721 |
|
|
|
2722 |
|
|
retval = sctp_do_peeloff(asoc, &newsock);
|
2723 |
|
|
if (retval < 0)
|
2724 |
|
|
goto out;
|
2725 |
|
|
|
2726 |
|
|
/* Map the socket to an unused fd that can be returned to the user. */
|
2727 |
|
|
retval = sock_map_fd(newsock);
|
2728 |
|
|
if (retval < 0) {
|
2729 |
|
|
sock_release(newsock);
|
2730 |
|
|
goto out;
|
2731 |
|
|
}
|
2732 |
|
|
|
2733 |
|
|
SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
|
2734 |
|
|
__FUNCTION__, sk, asoc, newsock->sk, retval);
|
2735 |
|
|
|
2736 |
|
|
/* Return the fd mapped to the new socket. */
|
2737 |
|
|
peeloff.sd = retval;
|
2738 |
|
|
if (copy_to_user(optval, &peeloff, len))
|
2739 |
|
|
retval = -EFAULT;
|
2740 |
|
|
|
2741 |
|
|
out:
|
2742 |
|
|
return retval;
|
2743 |
|
|
}
|
2744 |
|
|
|
2745 |
|
|
/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
|
2746 |
|
|
*
|
2747 |
|
|
* Applications can enable or disable heartbeats for any peer address of
|
2748 |
|
|
* an association, modify an address's heartbeat interval, force a
|
2749 |
|
|
* heartbeat to be sent immediately, and adjust the address's maximum
|
2750 |
|
|
* number of retransmissions sent before an address is considered
|
2751 |
|
|
* unreachable. The following structure is used to access and modify an
|
2752 |
|
|
* address's parameters:
|
2753 |
|
|
*
|
2754 |
|
|
* struct sctp_paddrparams {
|
2755 |
|
|
* sctp_assoc_t spp_assoc_id;
|
2756 |
|
|
* struct sockaddr_storage spp_address;
|
2757 |
|
|
* uint32_t spp_hbinterval;
|
2758 |
|
|
* uint16_t spp_pathmaxrxt;
|
2759 |
|
|
* };
|
2760 |
|
|
*
|
2761 |
|
|
* spp_assoc_id - (UDP style socket) This is filled in the application,
|
2762 |
|
|
* and identifies the association for this query.
|
2763 |
|
|
* spp_address - This specifies which address is of interest.
|
2764 |
|
|
* spp_hbinterval - This contains the value of the heartbeat interval,
|
2765 |
|
|
* in milliseconds. A value of 0, when modifying the
|
2766 |
|
|
* parameter, specifies that the heartbeat on this
|
2767 |
|
|
* address should be disabled. A value of UINT32_MAX
|
2768 |
|
|
* (4294967295), when modifying the parameter,
|
2769 |
|
|
* specifies that a heartbeat should be sent
|
2770 |
|
|
* immediately to the peer address, and the current
|
2771 |
|
|
* interval should remain unchanged.
|
2772 |
|
|
* spp_pathmaxrxt - This contains the maximum number of
|
2773 |
|
|
* retransmissions before this address shall be
|
2774 |
|
|
* considered unreachable.
|
2775 |
|
|
*/
|
2776 |
|
|
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
|
2777 |
|
|
char *optval, int *optlen)
|
2778 |
|
|
{
|
2779 |
|
|
struct sctp_paddrparams params;
|
2780 |
|
|
struct sctp_transport *trans;
|
2781 |
|
|
|
2782 |
|
|
if (len != sizeof(struct sctp_paddrparams))
|
2783 |
|
|
return -EINVAL;
|
2784 |
|
|
if (copy_from_user(¶ms, optval, *optlen))
|
2785 |
|
|
return -EFAULT;
|
2786 |
|
|
|
2787 |
|
|
trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
|
2788 |
|
|
params.spp_assoc_id);
|
2789 |
|
|
if (!trans)
|
2790 |
|
|
return -EINVAL;
|
2791 |
|
|
|
2792 |
|
|
/* The value of the heartbeat interval, in milliseconds. A value of 0,
|
2793 |
|
|
* when modifying the parameter, specifies that the heartbeat on this
|
2794 |
|
|
* address should be disabled.
|
2795 |
|
|
*/
|
2796 |
|
|
if (!trans->hb_allowed)
|
2797 |
|
|
params.spp_hbinterval = 0;
|
2798 |
|
|
else
|
2799 |
|
|
params.spp_hbinterval = JIFFIES_TO_MSECS(trans->hb_interval);
|
2800 |
|
|
|
2801 |
|
|
/* spp_pathmaxrxt contains the maximum number of retransmissions
|
2802 |
|
|
* before this address shall be considered unreachable.
|
2803 |
|
|
*/
|
2804 |
|
|
params.spp_pathmaxrxt = trans->error_threshold;
|
2805 |
|
|
|
2806 |
|
|
if (copy_to_user(optval, ¶ms, len))
|
2807 |
|
|
return -EFAULT;
|
2808 |
|
|
|
2809 |
|
|
if (put_user(len, optlen))
|
2810 |
|
|
return -EFAULT;
|
2811 |
|
|
|
2812 |
|
|
return 0;
|
2813 |
|
|
}
|
2814 |
|
|
|
2815 |
|
|
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
|
2816 |
|
|
*
|
2817 |
|
|
* Applications can specify protocol parameters for the default association
|
2818 |
|
|
* initialization. The option name argument to setsockopt() and getsockopt()
|
2819 |
|
|
* is SCTP_INITMSG.
|
2820 |
|
|
*
|
2821 |
|
|
* Setting initialization parameters is effective only on an unconnected
|
2822 |
|
|
* socket (for UDP-style sockets only future associations are effected
|
2823 |
|
|
* by the change). With TCP-style sockets, this option is inherited by
|
2824 |
|
|
* sockets derived from a listener socket.
|
2825 |
|
|
*/
|
2826 |
|
|
static int sctp_getsockopt_initmsg(struct sock *sk, int len, char *optval, int *optlen)
|
2827 |
|
|
{
|
2828 |
|
|
if (len != sizeof(struct sctp_initmsg))
|
2829 |
|
|
return -EINVAL;
|
2830 |
|
|
if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
|
2831 |
|
|
return -EFAULT;
|
2832 |
|
|
return 0;
|
2833 |
|
|
}
|
2834 |
|
|
|
2835 |
|
|
static int sctp_getsockopt_peer_addrs_num(struct sock *sk, int len,
|
2836 |
|
|
char *optval, int *optlen)
|
2837 |
|
|
{
|
2838 |
|
|
sctp_assoc_t id;
|
2839 |
|
|
struct sctp_association *asoc;
|
2840 |
|
|
struct list_head *pos;
|
2841 |
|
|
int cnt = 0;
|
2842 |
|
|
|
2843 |
|
|
if (len != sizeof(sctp_assoc_t))
|
2844 |
|
|
return -EINVAL;
|
2845 |
|
|
|
2846 |
|
|
if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
|
2847 |
|
|
return -EFAULT;
|
2848 |
|
|
|
2849 |
|
|
/* For UDP-style sockets, id specifies the association to query. */
|
2850 |
|
|
asoc = sctp_id2assoc(sk, id);
|
2851 |
|
|
if (!asoc)
|
2852 |
|
|
return -EINVAL;
|
2853 |
|
|
|
2854 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
2855 |
|
|
cnt ++;
|
2856 |
|
|
}
|
2857 |
|
|
|
2858 |
|
|
return cnt;
|
2859 |
|
|
}
|
2860 |
|
|
|
2861 |
|
|
static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
|
2862 |
|
|
char *optval, int *optlen)
|
2863 |
|
|
{
|
2864 |
|
|
struct sctp_association *asoc;
|
2865 |
|
|
struct list_head *pos;
|
2866 |
|
|
int cnt = 0;
|
2867 |
|
|
struct sctp_getaddrs getaddrs;
|
2868 |
|
|
struct sctp_transport *from;
|
2869 |
|
|
void *to;
|
2870 |
|
|
union sctp_addr temp;
|
2871 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
2872 |
|
|
int addrlen;
|
2873 |
|
|
|
2874 |
|
|
if (len != sizeof(struct sctp_getaddrs))
|
2875 |
|
|
return -EINVAL;
|
2876 |
|
|
|
2877 |
|
|
if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
|
2878 |
|
|
return -EFAULT;
|
2879 |
|
|
|
2880 |
|
|
if (getaddrs.addr_num <= 0) return -EINVAL;
|
2881 |
|
|
|
2882 |
|
|
/* For UDP-style sockets, id specifies the association to query. */
|
2883 |
|
|
asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
|
2884 |
|
|
if (!asoc)
|
2885 |
|
|
return -EINVAL;
|
2886 |
|
|
|
2887 |
|
|
to = (void *)getaddrs.addrs;
|
2888 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
2889 |
|
|
from = list_entry(pos, struct sctp_transport, transports);
|
2890 |
|
|
memcpy(&temp, &from->ipaddr, sizeof(temp));
|
2891 |
|
|
sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
|
2892 |
|
|
addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
|
2893 |
|
|
temp.v4.sin_port = htons(temp.v4.sin_port);
|
2894 |
|
|
if (copy_to_user(to, &temp, addrlen))
|
2895 |
|
|
return -EFAULT;
|
2896 |
|
|
to += addrlen ;
|
2897 |
|
|
cnt ++;
|
2898 |
|
|
if (cnt >= getaddrs.addr_num) break;
|
2899 |
|
|
}
|
2900 |
|
|
getaddrs.addr_num = cnt;
|
2901 |
|
|
if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs)))
|
2902 |
|
|
return -EFAULT;
|
2903 |
|
|
|
2904 |
|
|
return 0;
|
2905 |
|
|
}
|
2906 |
|
|
|
2907 |
|
|
static int sctp_getsockopt_local_addrs_num(struct sock *sk, int len,
|
2908 |
|
|
char *optval, int *optlen)
|
2909 |
|
|
{
|
2910 |
|
|
sctp_assoc_t id;
|
2911 |
|
|
struct sctp_bind_addr *bp;
|
2912 |
|
|
struct sctp_association *asoc;
|
2913 |
|
|
struct list_head *pos;
|
2914 |
|
|
int cnt = 0;
|
2915 |
|
|
|
2916 |
|
|
if (len != sizeof(sctp_assoc_t))
|
2917 |
|
|
return -EINVAL;
|
2918 |
|
|
|
2919 |
|
|
if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
|
2920 |
|
|
return -EFAULT;
|
2921 |
|
|
|
2922 |
|
|
/*
|
2923 |
|
|
* For UDP-style sockets, id specifies the association to query.
|
2924 |
|
|
* If the id field is set to the value '0' then the locally bound
|
2925 |
|
|
* addresses are returned without regard to any particular
|
2926 |
|
|
* association.
|
2927 |
|
|
*/
|
2928 |
|
|
if (0 == id) {
|
2929 |
|
|
bp = &sctp_sk(sk)->ep->base.bind_addr;
|
2930 |
|
|
} else {
|
2931 |
|
|
asoc = sctp_id2assoc(sk, id);
|
2932 |
|
|
if (!asoc)
|
2933 |
|
|
return -EINVAL;
|
2934 |
|
|
bp = &asoc->base.bind_addr;
|
2935 |
|
|
}
|
2936 |
|
|
|
2937 |
|
|
list_for_each(pos, &bp->address_list) {
|
2938 |
|
|
cnt ++;
|
2939 |
|
|
}
|
2940 |
|
|
|
2941 |
|
|
return cnt;
|
2942 |
|
|
}
|
2943 |
|
|
|
2944 |
|
|
static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
|
2945 |
|
|
char *optval, int *optlen)
|
2946 |
|
|
{
|
2947 |
|
|
struct sctp_bind_addr *bp;
|
2948 |
|
|
struct sctp_association *asoc;
|
2949 |
|
|
struct list_head *pos;
|
2950 |
|
|
int cnt = 0;
|
2951 |
|
|
struct sctp_getaddrs getaddrs;
|
2952 |
|
|
struct sctp_sockaddr_entry *from;
|
2953 |
|
|
void *to;
|
2954 |
|
|
union sctp_addr temp;
|
2955 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
2956 |
|
|
int addrlen;
|
2957 |
|
|
|
2958 |
|
|
if (len != sizeof(struct sctp_getaddrs))
|
2959 |
|
|
return -EINVAL;
|
2960 |
|
|
|
2961 |
|
|
if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
|
2962 |
|
|
return -EFAULT;
|
2963 |
|
|
|
2964 |
|
|
if (getaddrs.addr_num <= 0) return -EINVAL;
|
2965 |
|
|
/*
|
2966 |
|
|
* For UDP-style sockets, id specifies the association to query.
|
2967 |
|
|
* If the id field is set to the value '0' then the locally bound
|
2968 |
|
|
* addresses are returned without regard to any particular
|
2969 |
|
|
* association.
|
2970 |
|
|
*/
|
2971 |
|
|
if (0 == getaddrs.assoc_id) {
|
2972 |
|
|
bp = &sctp_sk(sk)->ep->base.bind_addr;
|
2973 |
|
|
} else {
|
2974 |
|
|
asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
|
2975 |
|
|
if (!asoc)
|
2976 |
|
|
return -EINVAL;
|
2977 |
|
|
bp = &asoc->base.bind_addr;
|
2978 |
|
|
}
|
2979 |
|
|
|
2980 |
|
|
to = (void *)getaddrs.addrs;
|
2981 |
|
|
list_for_each(pos, &bp->address_list) {
|
2982 |
|
|
from = list_entry(pos,
|
2983 |
|
|
struct sctp_sockaddr_entry,
|
2984 |
|
|
list);
|
2985 |
|
|
memcpy(&temp, &from->a, sizeof(temp));
|
2986 |
|
|
sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
|
2987 |
|
|
addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
|
2988 |
|
|
temp.v4.sin_port = htons(temp.v4.sin_port);
|
2989 |
|
|
if (copy_to_user(to, &temp, addrlen))
|
2990 |
|
|
return -EFAULT;
|
2991 |
|
|
to += addrlen;
|
2992 |
|
|
cnt ++;
|
2993 |
|
|
if (cnt >= getaddrs.addr_num) break;
|
2994 |
|
|
}
|
2995 |
|
|
getaddrs.addr_num = cnt;
|
2996 |
|
|
if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs)))
|
2997 |
|
|
return -EFAULT;
|
2998 |
|
|
|
2999 |
|
|
return 0;
|
3000 |
|
|
}
|
3001 |
|
|
|
3002 |
|
|
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
|
3003 |
|
|
*
|
3004 |
|
|
* Requests that the local SCTP stack use the enclosed peer address as
|
3005 |
|
|
* the association primary. The enclosed address must be one of the
|
3006 |
|
|
* association peer's addresses.
|
3007 |
|
|
*/
|
3008 |
|
|
static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
|
3009 |
|
|
char *optval, int *optlen)
|
3010 |
|
|
{
|
3011 |
|
|
struct sctp_prim prim;
|
3012 |
|
|
struct sctp_association *asoc;
|
3013 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3014 |
|
|
|
3015 |
|
|
if (len != sizeof(struct sctp_prim))
|
3016 |
|
|
return -EINVAL;
|
3017 |
|
|
|
3018 |
|
|
if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
|
3019 |
|
|
return -EFAULT;
|
3020 |
|
|
|
3021 |
|
|
asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
|
3022 |
|
|
if (!asoc)
|
3023 |
|
|
return -EINVAL;
|
3024 |
|
|
|
3025 |
|
|
if (!asoc->peer.primary_path)
|
3026 |
|
|
return -ENOTCONN;
|
3027 |
|
|
|
3028 |
|
|
asoc->peer.primary_path->ipaddr.v4.sin_port =
|
3029 |
|
|
htons(asoc->peer.primary_path->ipaddr.v4.sin_port);
|
3030 |
|
|
memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
|
3031 |
|
|
sizeof(union sctp_addr));
|
3032 |
|
|
asoc->peer.primary_path->ipaddr.v4.sin_port =
|
3033 |
|
|
ntohs(asoc->peer.primary_path->ipaddr.v4.sin_port);
|
3034 |
|
|
|
3035 |
|
|
sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
|
3036 |
|
|
(union sctp_addr *)&prim.ssp_addr);
|
3037 |
|
|
|
3038 |
|
|
if (copy_to_user(optval, &prim, sizeof(struct sctp_prim)))
|
3039 |
|
|
return -EFAULT;
|
3040 |
|
|
|
3041 |
|
|
return 0;
|
3042 |
|
|
}
|
3043 |
|
|
|
3044 |
|
|
/*
|
3045 |
|
|
*
|
3046 |
|
|
* 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
|
3047 |
|
|
*
|
3048 |
|
|
* Applications that wish to use the sendto() system call may wish to
|
3049 |
|
|
* specify a default set of parameters that would normally be supplied
|
3050 |
|
|
* through the inclusion of ancillary data. This socket option allows
|
3051 |
|
|
* such an application to set the default sctp_sndrcvinfo structure.
|
3052 |
|
|
|
3053 |
|
|
|
3054 |
|
|
* The application that wishes to use this socket option simply passes
|
3055 |
|
|
* in to this call the sctp_sndrcvinfo structure defined in Section
|
3056 |
|
|
* 5.2.2) The input parameters accepted by this call include
|
3057 |
|
|
* sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
|
3058 |
|
|
* sinfo_timetolive. The user must provide the sinfo_assoc_id field in
|
3059 |
|
|
* to this call if the caller is using the UDP model.
|
3060 |
|
|
*
|
3061 |
|
|
* For getsockopt, it get the default sctp_sndrcvinfo structure.
|
3062 |
|
|
*/
|
3063 |
|
|
static int sctp_getsockopt_default_send_param(struct sock *sk,
|
3064 |
|
|
int len, char *optval, int *optlen)
|
3065 |
|
|
{
|
3066 |
|
|
struct sctp_sndrcvinfo info;
|
3067 |
|
|
struct sctp_association *asoc;
|
3068 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3069 |
|
|
|
3070 |
|
|
if (len != sizeof(struct sctp_sndrcvinfo))
|
3071 |
|
|
return -EINVAL;
|
3072 |
|
|
if (copy_from_user(&info, optval, sizeof(struct sctp_sndrcvinfo)))
|
3073 |
|
|
return -EFAULT;
|
3074 |
|
|
|
3075 |
|
|
asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
|
3076 |
|
|
if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
|
3077 |
|
|
return -EINVAL;
|
3078 |
|
|
|
3079 |
|
|
if (asoc) {
|
3080 |
|
|
info.sinfo_stream = asoc->default_stream;
|
3081 |
|
|
info.sinfo_flags = asoc->default_flags;
|
3082 |
|
|
info.sinfo_ppid = asoc->default_ppid;
|
3083 |
|
|
info.sinfo_context = asoc->default_context;
|
3084 |
|
|
info.sinfo_timetolive = asoc->default_timetolive;
|
3085 |
|
|
} else {
|
3086 |
|
|
info.sinfo_stream = sp->default_stream;
|
3087 |
|
|
info.sinfo_flags = sp->default_flags;
|
3088 |
|
|
info.sinfo_ppid = sp->default_ppid;
|
3089 |
|
|
info.sinfo_context = sp->default_context;
|
3090 |
|
|
info.sinfo_timetolive = sp->default_timetolive;
|
3091 |
|
|
}
|
3092 |
|
|
|
3093 |
|
|
if (copy_to_user(optval, &info, sizeof(struct sctp_sndrcvinfo)))
|
3094 |
|
|
return -EFAULT;
|
3095 |
|
|
|
3096 |
|
|
return 0;
|
3097 |
|
|
}
|
3098 |
|
|
|
3099 |
|
|
/*
|
3100 |
|
|
*
|
3101 |
|
|
* 7.1.5 SCTP_NODELAY
|
3102 |
|
|
*
|
3103 |
|
|
* Turn on/off any Nagle-like algorithm. This means that packets are
|
3104 |
|
|
* generally sent as soon as possible and no unnecessary delays are
|
3105 |
|
|
* introduced, at the cost of more packets in the network. Expects an
|
3106 |
|
|
* integer boolean flag.
|
3107 |
|
|
*/
|
3108 |
|
|
|
3109 |
|
|
static int sctp_getsockopt_nodelay(struct sock *sk, int len,
|
3110 |
|
|
char *optval, int *optlen)
|
3111 |
|
|
{
|
3112 |
|
|
int val;
|
3113 |
|
|
|
3114 |
|
|
if (len < sizeof(int))
|
3115 |
|
|
return -EINVAL;
|
3116 |
|
|
|
3117 |
|
|
len = sizeof(int);
|
3118 |
|
|
val = (sctp_sk(sk)->nodelay == 1);
|
3119 |
|
|
if (put_user(len, optlen))
|
3120 |
|
|
return -EFAULT;
|
3121 |
|
|
if (copy_to_user(optval, &val, len))
|
3122 |
|
|
return -EFAULT;
|
3123 |
|
|
return 0;
|
3124 |
|
|
}
|
3125 |
|
|
|
3126 |
|
|
/*
|
3127 |
|
|
*
|
3128 |
|
|
* 7.1.1 SCTP_RTOINFO
|
3129 |
|
|
*
|
3130 |
|
|
* The protocol parameters used to initialize and bound retransmission
|
3131 |
|
|
* timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
|
3132 |
|
|
* and modify these parameters.
|
3133 |
|
|
* All parameters are time values, in milliseconds. A value of 0, when
|
3134 |
|
|
* modifying the parameters, indicates that the current value should not
|
3135 |
|
|
* be changed.
|
3136 |
|
|
*
|
3137 |
|
|
*/
|
3138 |
|
|
static int sctp_getsockopt_rtoinfo(struct sock *sk, int len, char *optval,
|
3139 |
|
|
int *optlen) {
|
3140 |
|
|
struct sctp_rtoinfo rtoinfo;
|
3141 |
|
|
struct sctp_association *asoc;
|
3142 |
|
|
|
3143 |
|
|
if (len != sizeof (struct sctp_rtoinfo))
|
3144 |
|
|
return -EINVAL;
|
3145 |
|
|
|
3146 |
|
|
if (copy_from_user(&rtoinfo, optval, sizeof (struct sctp_rtoinfo)))
|
3147 |
|
|
return -EFAULT;
|
3148 |
|
|
|
3149 |
|
|
asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
|
3150 |
|
|
|
3151 |
|
|
if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
|
3152 |
|
|
return -EINVAL;
|
3153 |
|
|
|
3154 |
|
|
/* Values corresponding to the specific association. */
|
3155 |
|
|
if (asoc) {
|
3156 |
|
|
rtoinfo.srto_initial = JIFFIES_TO_MSECS(asoc->rto_initial);
|
3157 |
|
|
rtoinfo.srto_max = JIFFIES_TO_MSECS(asoc->rto_max);
|
3158 |
|
|
rtoinfo.srto_min = JIFFIES_TO_MSECS(asoc->rto_min);
|
3159 |
|
|
} else {
|
3160 |
|
|
/* Values corresponding to the endpoint. */
|
3161 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3162 |
|
|
|
3163 |
|
|
rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
|
3164 |
|
|
rtoinfo.srto_max = sp->rtoinfo.srto_max;
|
3165 |
|
|
rtoinfo.srto_min = sp->rtoinfo.srto_min;
|
3166 |
|
|
}
|
3167 |
|
|
|
3168 |
|
|
if (put_user(len, optlen))
|
3169 |
|
|
return -EFAULT;
|
3170 |
|
|
|
3171 |
|
|
if (copy_to_user(optval, &rtoinfo, len))
|
3172 |
|
|
return -EFAULT;
|
3173 |
|
|
|
3174 |
|
|
return 0;
|
3175 |
|
|
}
|
3176 |
|
|
|
3177 |
|
|
/*
|
3178 |
|
|
*
|
3179 |
|
|
* 7.1.2 SCTP_ASSOCINFO
|
3180 |
|
|
*
|
3181 |
|
|
* This option is used to tune the the maximum retransmission attempts
|
3182 |
|
|
* of the association.
|
3183 |
|
|
* Returns an error if the new association retransmission value is
|
3184 |
|
|
* greater than the sum of the retransmission value of the peer.
|
3185 |
|
|
* See [SCTP] for more information.
|
3186 |
|
|
*
|
3187 |
|
|
*/
|
3188 |
|
|
static int sctp_getsockopt_associnfo(struct sock *sk, int len, char *optval,
|
3189 |
|
|
int *optlen)
|
3190 |
|
|
{
|
3191 |
|
|
|
3192 |
|
|
struct sctp_assocparams assocparams;
|
3193 |
|
|
struct sctp_association *asoc;
|
3194 |
|
|
struct list_head *pos;
|
3195 |
|
|
int cnt = 0;
|
3196 |
|
|
|
3197 |
|
|
if (len != sizeof (struct sctp_assocparams))
|
3198 |
|
|
return -EINVAL;
|
3199 |
|
|
|
3200 |
|
|
if (copy_from_user(&assocparams, optval,
|
3201 |
|
|
sizeof (struct sctp_assocparams)))
|
3202 |
|
|
return -EFAULT;
|
3203 |
|
|
|
3204 |
|
|
asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
|
3205 |
|
|
|
3206 |
|
|
if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
|
3207 |
|
|
return -EINVAL;
|
3208 |
|
|
|
3209 |
|
|
/* Values correspoinding to the specific association */
|
3210 |
|
|
if (assocparams.sasoc_assoc_id != 0) {
|
3211 |
|
|
assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
|
3212 |
|
|
assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
|
3213 |
|
|
assocparams.sasoc_local_rwnd = asoc->a_rwnd;
|
3214 |
|
|
assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
|
3215 |
|
|
* 1000) +
|
3216 |
|
|
(asoc->cookie_life.tv_usec
|
3217 |
|
|
/ 1000);
|
3218 |
|
|
|
3219 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
3220 |
|
|
cnt ++;
|
3221 |
|
|
}
|
3222 |
|
|
|
3223 |
|
|
assocparams.sasoc_number_peer_destinations = cnt;
|
3224 |
|
|
} else {
|
3225 |
|
|
/* Values corresponding to the endpoint */
|
3226 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3227 |
|
|
|
3228 |
|
|
assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
|
3229 |
|
|
assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
|
3230 |
|
|
assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
|
3231 |
|
|
assocparams.sasoc_cookie_life =
|
3232 |
|
|
sp->assocparams.sasoc_cookie_life;
|
3233 |
|
|
assocparams.sasoc_number_peer_destinations =
|
3234 |
|
|
sp->assocparams.
|
3235 |
|
|
sasoc_number_peer_destinations;
|
3236 |
|
|
}
|
3237 |
|
|
|
3238 |
|
|
if (put_user(len, optlen))
|
3239 |
|
|
return -EFAULT;
|
3240 |
|
|
|
3241 |
|
|
if (copy_to_user(optval, &assocparams, len))
|
3242 |
|
|
return -EFAULT;
|
3243 |
|
|
|
3244 |
|
|
return 0;
|
3245 |
|
|
}
|
3246 |
|
|
|
3247 |
|
|
/*
|
3248 |
|
|
* 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
|
3249 |
|
|
*
|
3250 |
|
|
* This socket option is a boolean flag which turns on or off mapped V4
|
3251 |
|
|
* addresses. If this option is turned on and the socket is type
|
3252 |
|
|
* PF_INET6, then IPv4 addresses will be mapped to V6 representation.
|
3253 |
|
|
* If this option is turned off, then no mapping will be done of V4
|
3254 |
|
|
* addresses and a user will receive both PF_INET6 and PF_INET type
|
3255 |
|
|
* addresses on the socket.
|
3256 |
|
|
*/
|
3257 |
|
|
static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
|
3258 |
|
|
char *optval, int *optlen)
|
3259 |
|
|
{
|
3260 |
|
|
int val;
|
3261 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3262 |
|
|
|
3263 |
|
|
if (len < sizeof(int))
|
3264 |
|
|
return -EINVAL;
|
3265 |
|
|
|
3266 |
|
|
len = sizeof(int);
|
3267 |
|
|
val = sp->v4mapped;
|
3268 |
|
|
if (put_user(len, optlen))
|
3269 |
|
|
return -EFAULT;
|
3270 |
|
|
if (copy_to_user(optval, &val, len))
|
3271 |
|
|
return -EFAULT;
|
3272 |
|
|
|
3273 |
|
|
return 0;
|
3274 |
|
|
}
|
3275 |
|
|
|
3276 |
|
|
/*
|
3277 |
|
|
* 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
|
3278 |
|
|
*
|
3279 |
|
|
* This socket option specifies the maximum size to put in any outgoing
|
3280 |
|
|
* SCTP chunk. If a message is larger than this size it will be
|
3281 |
|
|
* fragmented by SCTP into the specified size. Note that the underlying
|
3282 |
|
|
* SCTP implementation may fragment into smaller sized chunks when the
|
3283 |
|
|
* PMTU of the underlying association is smaller than the value set by
|
3284 |
|
|
* the user.
|
3285 |
|
|
*/
|
3286 |
|
|
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
|
3287 |
|
|
char *optval, int *optlen)
|
3288 |
|
|
{
|
3289 |
|
|
int val;
|
3290 |
|
|
|
3291 |
|
|
if (len < sizeof(int))
|
3292 |
|
|
return -EINVAL;
|
3293 |
|
|
|
3294 |
|
|
len = sizeof(int);
|
3295 |
|
|
|
3296 |
|
|
val = sctp_sk(sk)->user_frag;
|
3297 |
|
|
if (put_user(len, optlen))
|
3298 |
|
|
return -EFAULT;
|
3299 |
|
|
if (copy_to_user(optval, &val, len))
|
3300 |
|
|
return -EFAULT;
|
3301 |
|
|
|
3302 |
|
|
return 0;
|
3303 |
|
|
}
|
3304 |
|
|
|
3305 |
|
|
SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
|
3306 |
|
|
char *optval, int *optlen)
|
3307 |
|
|
{
|
3308 |
|
|
int retval = 0;
|
3309 |
|
|
int len;
|
3310 |
|
|
|
3311 |
|
|
SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p, ...)\n", sk);
|
3312 |
|
|
|
3313 |
|
|
/* I can hardly begin to describe how wrong this is. This is
|
3314 |
|
|
* so broken as to be worse than useless. The API draft
|
3315 |
|
|
* REALLY is NOT helpful here... I am not convinced that the
|
3316 |
|
|
* semantics of getsockopt() with a level OTHER THAN SOL_SCTP
|
3317 |
|
|
* are at all well-founded.
|
3318 |
|
|
*/
|
3319 |
|
|
if (level != SOL_SCTP) {
|
3320 |
|
|
struct sctp_af *af = sctp_sk(sk)->pf->af;
|
3321 |
|
|
|
3322 |
|
|
retval = af->getsockopt(sk, level, optname, optval, optlen);
|
3323 |
|
|
return retval;
|
3324 |
|
|
}
|
3325 |
|
|
|
3326 |
|
|
if (get_user(len, optlen))
|
3327 |
|
|
return -EFAULT;
|
3328 |
|
|
|
3329 |
|
|
sctp_lock_sock(sk);
|
3330 |
|
|
|
3331 |
|
|
switch (optname) {
|
3332 |
|
|
case SCTP_STATUS:
|
3333 |
|
|
retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
|
3334 |
|
|
break;
|
3335 |
|
|
case SCTP_DISABLE_FRAGMENTS:
|
3336 |
|
|
retval = sctp_getsockopt_disable_fragments(sk, len, optval,
|
3337 |
|
|
optlen);
|
3338 |
|
|
break;
|
3339 |
|
|
case SCTP_EVENTS:
|
3340 |
|
|
retval = sctp_getsockopt_events(sk, len, optval, optlen);
|
3341 |
|
|
break;
|
3342 |
|
|
case SCTP_AUTOCLOSE:
|
3343 |
|
|
retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
|
3344 |
|
|
break;
|
3345 |
|
|
case SCTP_SOCKOPT_PEELOFF:
|
3346 |
|
|
retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
|
3347 |
|
|
break;
|
3348 |
|
|
case SCTP_PEER_ADDR_PARAMS:
|
3349 |
|
|
retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
|
3350 |
|
|
optlen);
|
3351 |
|
|
break;
|
3352 |
|
|
case SCTP_INITMSG:
|
3353 |
|
|
retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
|
3354 |
|
|
break;
|
3355 |
|
|
case SCTP_GET_PEER_ADDRS_NUM:
|
3356 |
|
|
retval = sctp_getsockopt_peer_addrs_num(sk, len, optval,
|
3357 |
|
|
optlen);
|
3358 |
|
|
break;
|
3359 |
|
|
case SCTP_GET_LOCAL_ADDRS_NUM:
|
3360 |
|
|
retval = sctp_getsockopt_local_addrs_num(sk, len, optval,
|
3361 |
|
|
optlen);
|
3362 |
|
|
break;
|
3363 |
|
|
case SCTP_GET_PEER_ADDRS:
|
3364 |
|
|
retval = sctp_getsockopt_peer_addrs(sk, len, optval,
|
3365 |
|
|
optlen);
|
3366 |
|
|
break;
|
3367 |
|
|
case SCTP_GET_LOCAL_ADDRS:
|
3368 |
|
|
retval = sctp_getsockopt_local_addrs(sk, len, optval,
|
3369 |
|
|
optlen);
|
3370 |
|
|
break;
|
3371 |
|
|
case SCTP_DEFAULT_SEND_PARAM:
|
3372 |
|
|
retval = sctp_getsockopt_default_send_param(sk, len,
|
3373 |
|
|
optval, optlen);
|
3374 |
|
|
break;
|
3375 |
|
|
case SCTP_PRIMARY_ADDR:
|
3376 |
|
|
retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
|
3377 |
|
|
break;
|
3378 |
|
|
case SCTP_NODELAY:
|
3379 |
|
|
retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
|
3380 |
|
|
break;
|
3381 |
|
|
case SCTP_RTOINFO:
|
3382 |
|
|
retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
|
3383 |
|
|
break;
|
3384 |
|
|
case SCTP_ASSOCINFO:
|
3385 |
|
|
retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
|
3386 |
|
|
break;
|
3387 |
|
|
case SCTP_I_WANT_MAPPED_V4_ADDR:
|
3388 |
|
|
retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
|
3389 |
|
|
break;
|
3390 |
|
|
case SCTP_MAXSEG:
|
3391 |
|
|
retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
|
3392 |
|
|
break;
|
3393 |
|
|
case SCTP_GET_PEER_ADDR_INFO:
|
3394 |
|
|
retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
|
3395 |
|
|
optlen);
|
3396 |
|
|
break;
|
3397 |
|
|
default:
|
3398 |
|
|
retval = -ENOPROTOOPT;
|
3399 |
|
|
break;
|
3400 |
|
|
};
|
3401 |
|
|
|
3402 |
|
|
sctp_release_sock(sk);
|
3403 |
|
|
return retval;
|
3404 |
|
|
}
|
3405 |
|
|
|
3406 |
|
|
static void sctp_hash(struct sock *sk)
|
3407 |
|
|
{
|
3408 |
|
|
/* STUB */
|
3409 |
|
|
}
|
3410 |
|
|
|
3411 |
|
|
static void sctp_unhash(struct sock *sk)
|
3412 |
|
|
{
|
3413 |
|
|
/* STUB */
|
3414 |
|
|
}
|
3415 |
|
|
|
3416 |
|
|
/* Check if port is acceptable. Possibly find first available port.
|
3417 |
|
|
*
|
3418 |
|
|
* The port hash table (contained in the 'global' SCTP protocol storage
|
3419 |
|
|
* returned by struct sctp_protocol *sctp_get_protocol()). The hash
|
3420 |
|
|
* table is an array of 4096 lists (sctp_bind_hashbucket). Each
|
3421 |
|
|
* list (the list number is the port number hashed out, so as you
|
3422 |
|
|
* would expect from a hash function, all the ports in a given list have
|
3423 |
|
|
* such a number that hashes out to the same list number; you were
|
3424 |
|
|
* expecting that, right?); so each list has a set of ports, with a
|
3425 |
|
|
* link to the socket (struct sock) that uses it, the port number and
|
3426 |
|
|
* a fastreuse flag (FIXME: NPI ipg).
|
3427 |
|
|
*/
|
3428 |
|
|
static struct sctp_bind_bucket *sctp_bucket_create(
|
3429 |
|
|
struct sctp_bind_hashbucket *head, unsigned short snum);
|
3430 |
|
|
|
3431 |
|
|
static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
|
3432 |
|
|
{
|
3433 |
|
|
struct sctp_bind_hashbucket *head; /* hash list */
|
3434 |
|
|
struct sctp_bind_bucket *pp; /* hash list port iterator */
|
3435 |
|
|
unsigned short snum;
|
3436 |
|
|
int ret;
|
3437 |
|
|
|
3438 |
|
|
/* NOTE: Remember to put this back to net order. */
|
3439 |
|
|
addr->v4.sin_port = ntohs(addr->v4.sin_port);
|
3440 |
|
|
snum = addr->v4.sin_port;
|
3441 |
|
|
|
3442 |
|
|
SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
|
3443 |
|
|
sctp_local_bh_disable();
|
3444 |
|
|
|
3445 |
|
|
if (snum == 0) {
|
3446 |
|
|
/* Search for an available port.
|
3447 |
|
|
*
|
3448 |
|
|
* 'sctp_port_rover' was the last port assigned, so
|
3449 |
|
|
* we start to search from 'sctp_port_rover +
|
3450 |
|
|
* 1'. What we do is first check if port 'rover' is
|
3451 |
|
|
* already in the hash table; if not, we use that; if
|
3452 |
|
|
* it is, we try next.
|
3453 |
|
|
*/
|
3454 |
|
|
int low = sysctl_local_port_range[0];
|
3455 |
|
|
int high = sysctl_local_port_range[1];
|
3456 |
|
|
int remaining = (high - low) + 1;
|
3457 |
|
|
int rover;
|
3458 |
|
|
int index;
|
3459 |
|
|
|
3460 |
|
|
sctp_spin_lock(&sctp_port_alloc_lock);
|
3461 |
|
|
rover = sctp_port_rover;
|
3462 |
|
|
do {
|
3463 |
|
|
rover++;
|
3464 |
|
|
if ((rover < low) || (rover > high))
|
3465 |
|
|
rover = low;
|
3466 |
|
|
index = sctp_phashfn(rover);
|
3467 |
|
|
head = &sctp_port_hashtable[index];
|
3468 |
|
|
sctp_spin_lock(&head->lock);
|
3469 |
|
|
for (pp = head->chain; pp; pp = pp->next)
|
3470 |
|
|
if (pp->port == rover)
|
3471 |
|
|
goto next;
|
3472 |
|
|
break;
|
3473 |
|
|
next:
|
3474 |
|
|
sctp_spin_unlock(&head->lock);
|
3475 |
|
|
} while (--remaining > 0);
|
3476 |
|
|
sctp_port_rover = rover;
|
3477 |
|
|
sctp_spin_unlock(&sctp_port_alloc_lock);
|
3478 |
|
|
|
3479 |
|
|
/* Exhausted local port range during search? */
|
3480 |
|
|
ret = 1;
|
3481 |
|
|
if (remaining <= 0)
|
3482 |
|
|
goto fail;
|
3483 |
|
|
|
3484 |
|
|
/* OK, here is the one we will use. HEAD (the port
|
3485 |
|
|
* hash table list entry) is non-NULL and we hold it's
|
3486 |
|
|
* mutex.
|
3487 |
|
|
*/
|
3488 |
|
|
snum = rover;
|
3489 |
|
|
pp = NULL;
|
3490 |
|
|
} else {
|
3491 |
|
|
/* We are given an specific port number; we verify
|
3492 |
|
|
* that it is not being used. If it is used, we will
|
3493 |
|
|
* exahust the search in the hash list corresponding
|
3494 |
|
|
* to the port number (snum) - we detect that with the
|
3495 |
|
|
* port iterator, pp being NULL.
|
3496 |
|
|
*/
|
3497 |
|
|
head = &sctp_port_hashtable[sctp_phashfn(snum)];
|
3498 |
|
|
sctp_spin_lock(&head->lock);
|
3499 |
|
|
for (pp = head->chain; pp; pp = pp->next) {
|
3500 |
|
|
if (pp->port == snum)
|
3501 |
|
|
break;
|
3502 |
|
|
}
|
3503 |
|
|
}
|
3504 |
|
|
|
3505 |
|
|
|
3506 |
|
|
if (pp && pp->sk) {
|
3507 |
|
|
/* We had a port hash table hit - there is an
|
3508 |
|
|
* available port (pp != NULL) and it is being
|
3509 |
|
|
* used by other socket (pp->sk != NULL); that other
|
3510 |
|
|
* socket is going to be sk2.
|
3511 |
|
|
*/
|
3512 |
|
|
int sk_reuse = sk->sk_reuse;
|
3513 |
|
|
struct sock *sk2 = pp->sk;
|
3514 |
|
|
|
3515 |
|
|
SCTP_DEBUG_PRINTK("sctp_get_port() found a "
|
3516 |
|
|
"possible match\n");
|
3517 |
|
|
if (pp->fastreuse != 0 && sk->sk_reuse != 0)
|
3518 |
|
|
goto success;
|
3519 |
|
|
|
3520 |
|
|
/* Run through the list of sockets bound to the port
|
3521 |
|
|
* (pp->port) [via the pointers bind_next and
|
3522 |
|
|
* bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
|
3523 |
|
|
* we get the endpoint they describe and run through
|
3524 |
|
|
* the endpoint's list of IP (v4 or v6) addresses,
|
3525 |
|
|
* comparing each of the addresses with the address of
|
3526 |
|
|
* the socket sk. If we find a match, then that means
|
3527 |
|
|
* that this port/socket (sk) combination are already
|
3528 |
|
|
* in an endpoint.
|
3529 |
|
|
*/
|
3530 |
|
|
for ( ; sk2 != NULL; sk2 = sk2->bind_next) {
|
3531 |
|
|
struct sctp_endpoint *ep2;
|
3532 |
|
|
ep2 = sctp_sk(sk2)->ep;
|
3533 |
|
|
|
3534 |
|
|
if (sk_reuse && sk2->sk_reuse)
|
3535 |
|
|
continue;
|
3536 |
|
|
|
3537 |
|
|
if (sctp_bind_addr_match(&ep2->base.bind_addr, addr,
|
3538 |
|
|
sctp_sk(sk)))
|
3539 |
|
|
goto found;
|
3540 |
|
|
}
|
3541 |
|
|
|
3542 |
|
|
found:
|
3543 |
|
|
/* If we found a conflict, fail. */
|
3544 |
|
|
if (sk2 != NULL) {
|
3545 |
|
|
ret = (long) sk2;
|
3546 |
|
|
goto fail_unlock;
|
3547 |
|
|
}
|
3548 |
|
|
SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
|
3549 |
|
|
}
|
3550 |
|
|
|
3551 |
|
|
/* If there was a hash table miss, create a new port. */
|
3552 |
|
|
ret = 1;
|
3553 |
|
|
|
3554 |
|
|
if (!pp && !(pp = sctp_bucket_create(head, snum)))
|
3555 |
|
|
goto fail_unlock;
|
3556 |
|
|
|
3557 |
|
|
/* In either case (hit or miss), make sure fastreuse is 1 only
|
3558 |
|
|
* if sk->sk_reuse is too (that is, if the caller requested
|
3559 |
|
|
* SO_REUSEADDR on this socket -sk-).
|
3560 |
|
|
*/
|
3561 |
|
|
if (!pp->sk)
|
3562 |
|
|
pp->fastreuse = sk->sk_reuse ? 1 : 0;
|
3563 |
|
|
else if (pp->fastreuse && sk->sk_reuse == 0)
|
3564 |
|
|
pp->fastreuse = 0;
|
3565 |
|
|
|
3566 |
|
|
/* We are set, so fill up all the data in the hash table
|
3567 |
|
|
* entry, tie the socket list information with the rest of the
|
3568 |
|
|
* sockets FIXME: Blurry, NPI (ipg).
|
3569 |
|
|
*/
|
3570 |
|
|
success:
|
3571 |
|
|
(sk)->num = snum;
|
3572 |
|
|
if (sk->prev == NULL) {
|
3573 |
|
|
if ((sk->bind_next = pp->sk) != NULL)
|
3574 |
|
|
pp->sk->bind_pprev = &sk->bind_next;
|
3575 |
|
|
pp->sk = sk;
|
3576 |
|
|
sk->bind_pprev = &pp->sk;
|
3577 |
|
|
sk->prev = (struct sock *) pp;
|
3578 |
|
|
}
|
3579 |
|
|
ret = 0;
|
3580 |
|
|
|
3581 |
|
|
fail_unlock:
|
3582 |
|
|
sctp_spin_unlock(&head->lock);
|
3583 |
|
|
|
3584 |
|
|
fail:
|
3585 |
|
|
sctp_local_bh_enable();
|
3586 |
|
|
|
3587 |
|
|
SCTP_DEBUG_PRINTK("sctp_get_port() ends, ret=%d\n", ret);
|
3588 |
|
|
addr->v4.sin_port = htons(addr->v4.sin_port);
|
3589 |
|
|
return ret;
|
3590 |
|
|
}
|
3591 |
|
|
|
3592 |
|
|
/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
|
3593 |
|
|
* port is requested.
|
3594 |
|
|
*/
|
3595 |
|
|
static int sctp_get_port(struct sock *sk, unsigned short snum)
|
3596 |
|
|
{
|
3597 |
|
|
long ret;
|
3598 |
|
|
union sctp_addr addr;
|
3599 |
|
|
struct sctp_af *af = sctp_sk(sk)->pf->af;
|
3600 |
|
|
|
3601 |
|
|
/* Set up a dummy address struct from the sk. */
|
3602 |
|
|
af->from_sk(&addr, sk);
|
3603 |
|
|
addr.v4.sin_port = htons(snum);
|
3604 |
|
|
|
3605 |
|
|
/* Note: sk->sk_num gets filled in if ephemeral port request. */
|
3606 |
|
|
ret = sctp_get_port_local(sk, &addr);
|
3607 |
|
|
|
3608 |
|
|
return (ret ? 1 : 0);
|
3609 |
|
|
}
|
3610 |
|
|
|
3611 |
|
|
/*
|
3612 |
|
|
* 3.1.3 listen() - UDP Style Syntax
|
3613 |
|
|
*
|
3614 |
|
|
* By default, new associations are not accepted for UDP style sockets.
|
3615 |
|
|
* An application uses listen() to mark a socket as being able to
|
3616 |
|
|
* accept new associations.
|
3617 |
|
|
*/
|
3618 |
|
|
SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
|
3619 |
|
|
{
|
3620 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3621 |
|
|
struct sctp_endpoint *ep = sp->ep;
|
3622 |
|
|
|
3623 |
|
|
/* Only UDP style sockets that are not peeled off are allowed to
|
3624 |
|
|
* listen().
|
3625 |
|
|
*/
|
3626 |
|
|
if (!sctp_style(sk, UDP))
|
3627 |
|
|
return -EINVAL;
|
3628 |
|
|
|
3629 |
|
|
/* If backlog is zero, disable listening. */
|
3630 |
|
|
if (!backlog) {
|
3631 |
|
|
if (sctp_sstate(sk, CLOSED))
|
3632 |
|
|
return 0;
|
3633 |
|
|
|
3634 |
|
|
sctp_unhash_endpoint(ep);
|
3635 |
|
|
sk->sk_state = SCTP_SS_CLOSED;
|
3636 |
|
|
}
|
3637 |
|
|
|
3638 |
|
|
/* Return if we are already listening. */
|
3639 |
|
|
if (sctp_sstate(sk, LISTENING))
|
3640 |
|
|
return 0;
|
3641 |
|
|
|
3642 |
|
|
/*
|
3643 |
|
|
* If a bind() or sctp_bindx() is not called prior to a listen()
|
3644 |
|
|
* call that allows new associations to be accepted, the system
|
3645 |
|
|
* picks an ephemeral port and will choose an address set equivalent
|
3646 |
|
|
* to binding with a wildcard address.
|
3647 |
|
|
*
|
3648 |
|
|
* This is not currently spelled out in the SCTP sockets
|
3649 |
|
|
* extensions draft, but follows the practice as seen in TCP
|
3650 |
|
|
* sockets.
|
3651 |
|
|
*/
|
3652 |
|
|
if (!ep->base.bind_addr.port) {
|
3653 |
|
|
if (sctp_autobind(sk))
|
3654 |
|
|
return -EAGAIN;
|
3655 |
|
|
}
|
3656 |
|
|
sk->sk_state = SCTP_SS_LISTENING;
|
3657 |
|
|
sctp_hash_endpoint(ep);
|
3658 |
|
|
return 0;
|
3659 |
|
|
}
|
3660 |
|
|
|
3661 |
|
|
/*
|
3662 |
|
|
* 4.1.3 listen() - TCP Style Syntax
|
3663 |
|
|
*
|
3664 |
|
|
* Applications uses listen() to ready the SCTP endpoint for accepting
|
3665 |
|
|
* inbound associations.
|
3666 |
|
|
*/
|
3667 |
|
|
SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
|
3668 |
|
|
{
|
3669 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3670 |
|
|
struct sctp_endpoint *ep = sp->ep;
|
3671 |
|
|
|
3672 |
|
|
/* If backlog is zero, disable listening. */
|
3673 |
|
|
if (!backlog) {
|
3674 |
|
|
if (sctp_sstate(sk, CLOSED))
|
3675 |
|
|
return 0;
|
3676 |
|
|
|
3677 |
|
|
sctp_unhash_endpoint(ep);
|
3678 |
|
|
sk->sk_state = SCTP_SS_CLOSED;
|
3679 |
|
|
}
|
3680 |
|
|
|
3681 |
|
|
if (sctp_sstate(sk, LISTENING))
|
3682 |
|
|
return 0;
|
3683 |
|
|
|
3684 |
|
|
/*
|
3685 |
|
|
* If a bind() or sctp_bindx() is not called prior to a listen()
|
3686 |
|
|
* call that allows new associations to be accepted, the system
|
3687 |
|
|
* picks an ephemeral port and will choose an address set equivalent
|
3688 |
|
|
* to binding with a wildcard address.
|
3689 |
|
|
*
|
3690 |
|
|
* This is not currently spelled out in the SCTP sockets
|
3691 |
|
|
* extensions draft, but follows the practice as seen in TCP
|
3692 |
|
|
* sockets.
|
3693 |
|
|
*/
|
3694 |
|
|
if (!ep->base.bind_addr.port) {
|
3695 |
|
|
if (sctp_autobind(sk))
|
3696 |
|
|
return -EAGAIN;
|
3697 |
|
|
}
|
3698 |
|
|
sk->sk_state = SCTP_SS_LISTENING;
|
3699 |
|
|
sk->sk_max_ack_backlog = backlog;
|
3700 |
|
|
sctp_hash_endpoint(ep);
|
3701 |
|
|
return 0;
|
3702 |
|
|
}
|
3703 |
|
|
|
3704 |
|
|
/*
|
3705 |
|
|
* Move a socket to LISTENING state.
|
3706 |
|
|
*/
|
3707 |
|
|
int sctp_inet_listen(struct socket *sock, int backlog)
|
3708 |
|
|
{
|
3709 |
|
|
struct sock *sk = sock->sk;
|
3710 |
|
|
struct crypto_tfm *tfm=NULL;
|
3711 |
|
|
int err = -EINVAL;
|
3712 |
|
|
|
3713 |
|
|
if (unlikely(backlog < 0))
|
3714 |
|
|
goto out;
|
3715 |
|
|
|
3716 |
|
|
sctp_lock_sock(sk);
|
3717 |
|
|
|
3718 |
|
|
if (sock->state != SS_UNCONNECTED)
|
3719 |
|
|
goto out;
|
3720 |
|
|
|
3721 |
|
|
/* Allocate HMAC for generating cookie. */
|
3722 |
|
|
if (sctp_hmac_alg) {
|
3723 |
|
|
tfm = sctp_crypto_alloc_tfm(sctp_hmac_alg, 0);
|
3724 |
|
|
if (!tfm) {
|
3725 |
|
|
err = -ENOSYS;
|
3726 |
|
|
goto out;
|
3727 |
|
|
}
|
3728 |
|
|
}
|
3729 |
|
|
|
3730 |
|
|
switch (sock->type) {
|
3731 |
|
|
case SOCK_SEQPACKET:
|
3732 |
|
|
err = sctp_seqpacket_listen(sk, backlog);
|
3733 |
|
|
break;
|
3734 |
|
|
case SOCK_STREAM:
|
3735 |
|
|
err = sctp_stream_listen(sk, backlog);
|
3736 |
|
|
break;
|
3737 |
|
|
default:
|
3738 |
|
|
break;
|
3739 |
|
|
};
|
3740 |
|
|
if (err)
|
3741 |
|
|
goto cleanup;
|
3742 |
|
|
|
3743 |
|
|
/* Store away the transform reference. */
|
3744 |
|
|
sctp_sk(sk)->hmac = tfm;
|
3745 |
|
|
out:
|
3746 |
|
|
sctp_release_sock(sk);
|
3747 |
|
|
return err;
|
3748 |
|
|
cleanup:
|
3749 |
|
|
if (tfm)
|
3750 |
|
|
sctp_crypto_free_tfm(tfm);
|
3751 |
|
|
goto out;
|
3752 |
|
|
}
|
3753 |
|
|
|
3754 |
|
|
/*
|
3755 |
|
|
* This function is done by modeling the current datagram_poll() and the
|
3756 |
|
|
* tcp_poll(). Note that, based on these implementations, we don't
|
3757 |
|
|
* lock the socket in this function, even though it seems that,
|
3758 |
|
|
* ideally, locking or some other mechanisms can be used to ensure
|
3759 |
|
|
* the integrity of the counters (sndbuf and wmem_queued) used
|
3760 |
|
|
* in this place. We assume that we don't need locks either until proven
|
3761 |
|
|
* otherwise.
|
3762 |
|
|
*
|
3763 |
|
|
* Another thing to note is that we include the Async I/O support
|
3764 |
|
|
* here, again, by modeling the current TCP/UDP code. We don't have
|
3765 |
|
|
* a good way to test with it yet.
|
3766 |
|
|
*/
|
3767 |
|
|
unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
3768 |
|
|
{
|
3769 |
|
|
struct sock *sk = sock->sk;
|
3770 |
|
|
struct sctp_opt *sp = sctp_sk(sk);
|
3771 |
|
|
unsigned int mask;
|
3772 |
|
|
|
3773 |
|
|
poll_wait(file, sk->sk_sleep, wait);
|
3774 |
|
|
|
3775 |
|
|
/* A TCP-style listening socket becomes readable when the accept queue
|
3776 |
|
|
* is not empty.
|
3777 |
|
|
*/
|
3778 |
|
|
if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
|
3779 |
|
|
return (!list_empty(&sp->ep->asocs)) ?
|
3780 |
|
|
(POLLIN | POLLRDNORM) : 0;
|
3781 |
|
|
|
3782 |
|
|
mask = 0;
|
3783 |
|
|
|
3784 |
|
|
/* Is there any exceptional events? */
|
3785 |
|
|
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
|
3786 |
|
|
mask |= POLLERR;
|
3787 |
|
|
if (sk->sk_shutdown == SHUTDOWN_MASK)
|
3788 |
|
|
mask |= POLLHUP;
|
3789 |
|
|
|
3790 |
|
|
/* Is it readable? Reconsider this code with TCP-style support. */
|
3791 |
|
|
if (!skb_queue_empty(&sk->sk_receive_queue) ||
|
3792 |
|
|
(sk->sk_shutdown & RCV_SHUTDOWN))
|
3793 |
|
|
mask |= POLLIN | POLLRDNORM;
|
3794 |
|
|
|
3795 |
|
|
/* The association is either gone or not ready. */
|
3796 |
|
|
if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
|
3797 |
|
|
return mask;
|
3798 |
|
|
|
3799 |
|
|
/* Is it writable? */
|
3800 |
|
|
if (sctp_writeable(sk)) {
|
3801 |
|
|
mask |= POLLOUT | POLLWRNORM;
|
3802 |
|
|
} else {
|
3803 |
|
|
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
|
3804 |
|
|
/*
|
3805 |
|
|
* Since the socket is not locked, the buffer
|
3806 |
|
|
* might be made available after the writeable check and
|
3807 |
|
|
* before the bit is set. This could cause a lost I/O
|
3808 |
|
|
* signal. tcp_poll() has a race breaker for this race
|
3809 |
|
|
* condition. Based on their implementation, we put
|
3810 |
|
|
* in the following code to cover it as well.
|
3811 |
|
|
*/
|
3812 |
|
|
if (sctp_writeable(sk))
|
3813 |
|
|
mask |= POLLOUT | POLLWRNORM;
|
3814 |
|
|
}
|
3815 |
|
|
return mask;
|
3816 |
|
|
}
|
3817 |
|
|
|
3818 |
|
|
/********************************************************************
|
3819 |
|
|
* 2nd Level Abstractions
|
3820 |
|
|
********************************************************************/
|
3821 |
|
|
|
3822 |
|
|
static struct sctp_bind_bucket *sctp_bucket_create(
|
3823 |
|
|
struct sctp_bind_hashbucket *head, unsigned short snum)
|
3824 |
|
|
{
|
3825 |
|
|
struct sctp_bind_bucket *pp;
|
3826 |
|
|
|
3827 |
|
|
SCTP_DEBUG_PRINTK( "sctp_bucket_create() begins, snum=%d\n", snum);
|
3828 |
|
|
pp = kmalloc(sizeof(struct sctp_bind_bucket), GFP_ATOMIC);
|
3829 |
|
|
if (pp) {
|
3830 |
|
|
pp->port = snum;
|
3831 |
|
|
pp->fastreuse = 0;
|
3832 |
|
|
pp->sk = NULL;
|
3833 |
|
|
if ((pp->next = head->chain) != NULL)
|
3834 |
|
|
pp->next->pprev = &pp->next;
|
3835 |
|
|
head->chain = pp;
|
3836 |
|
|
pp->pprev = &head->chain;
|
3837 |
|
|
}
|
3838 |
|
|
SCTP_DEBUG_PRINTK("sctp_bucket_create() ends, pp=%p\n", pp);
|
3839 |
|
|
return pp;
|
3840 |
|
|
}
|
3841 |
|
|
|
3842 |
|
|
/* Release this socket's reference to a local port. */
|
3843 |
|
|
static __inline__ void __sctp_put_port(struct sock *sk)
|
3844 |
|
|
{
|
3845 |
|
|
struct sctp_bind_hashbucket *head =
|
3846 |
|
|
&sctp_port_hashtable[sctp_phashfn((sk)->num)];
|
3847 |
|
|
struct sctp_bind_bucket *pp;
|
3848 |
|
|
|
3849 |
|
|
sctp_spin_lock(&head->lock);
|
3850 |
|
|
pp = (struct sctp_bind_bucket *) sk->prev;
|
3851 |
|
|
if (sk->bind_next)
|
3852 |
|
|
sk->bind_next->bind_pprev = sk->bind_pprev;
|
3853 |
|
|
*(sk->bind_pprev) = sk->bind_next;
|
3854 |
|
|
sk->prev = NULL;
|
3855 |
|
|
(sk)->num = 0;
|
3856 |
|
|
if (pp->sk) {
|
3857 |
|
|
if (pp->next)
|
3858 |
|
|
pp->next->pprev = pp->pprev;
|
3859 |
|
|
*(pp->pprev) = pp->next;
|
3860 |
|
|
kfree(pp);
|
3861 |
|
|
}
|
3862 |
|
|
sctp_spin_unlock(&head->lock);
|
3863 |
|
|
}
|
3864 |
|
|
|
3865 |
|
|
void sctp_put_port(struct sock *sk)
|
3866 |
|
|
{
|
3867 |
|
|
sctp_local_bh_disable();
|
3868 |
|
|
__sctp_put_port(sk);
|
3869 |
|
|
sctp_local_bh_enable();
|
3870 |
|
|
}
|
3871 |
|
|
|
3872 |
|
|
/*
|
3873 |
|
|
* The system picks an ephemeral port and choose an address set equivalent
|
3874 |
|
|
* to binding with a wildcard address.
|
3875 |
|
|
* One of those addresses will be the primary address for the association.
|
3876 |
|
|
* This automatically enables the multihoming capability of SCTP.
|
3877 |
|
|
*/
|
3878 |
|
|
static int sctp_autobind(struct sock *sk)
|
3879 |
|
|
{
|
3880 |
|
|
union sctp_addr autoaddr;
|
3881 |
|
|
struct sctp_af *af;
|
3882 |
|
|
unsigned short port;
|
3883 |
|
|
|
3884 |
|
|
/* Initialize a local sockaddr structure to INADDR_ANY. */
|
3885 |
|
|
af = sctp_sk(sk)->pf->af;
|
3886 |
|
|
|
3887 |
|
|
port = htons(sk->num);
|
3888 |
|
|
af->inaddr_any(&autoaddr, port);
|
3889 |
|
|
|
3890 |
|
|
return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
|
3891 |
|
|
}
|
3892 |
|
|
|
3893 |
|
|
/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
|
3894 |
|
|
*
|
3895 |
|
|
* From RFC 2292
|
3896 |
|
|
* 4.2 The cmsghdr Structure *
|
3897 |
|
|
*
|
3898 |
|
|
* When ancillary data is sent or received, any number of ancillary data
|
3899 |
|
|
* objects can be specified by the msg_control and msg_controllen members of
|
3900 |
|
|
* the msghdr structure, because each object is preceded by
|
3901 |
|
|
* a cmsghdr structure defining the object's length (the cmsg_len member).
|
3902 |
|
|
* Historically Berkeley-derived implementations have passed only one object
|
3903 |
|
|
* at a time, but this API allows multiple objects to be
|
3904 |
|
|
* passed in a single call to sendmsg() or recvmsg(). The following example
|
3905 |
|
|
* shows two ancillary data objects in a control buffer.
|
3906 |
|
|
*
|
3907 |
|
|
* |<--------------------------- msg_controllen -------------------------->|
|
3908 |
|
|
* | |
|
3909 |
|
|
*
|
3910 |
|
|
* |<----- ancillary data object ----->|<----- ancillary data object ----->|
|
3911 |
|
|
*
|
3912 |
|
|
* |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
|
3913 |
|
|
* | | |
|
3914 |
|
|
*
|
3915 |
|
|
* |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
|
3916 |
|
|
*
|
3917 |
|
|
* |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
|
3918 |
|
|
* | | | | |
|
3919 |
|
|
*
|
3920 |
|
|
* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
|
3921 |
|
|
* |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
|
3922 |
|
|
*
|
3923 |
|
|
* |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
|
3924 |
|
|
*
|
3925 |
|
|
* +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
|
3926 |
|
|
* ^
|
3927 |
|
|
* |
|
3928 |
|
|
*
|
3929 |
|
|
* msg_control
|
3930 |
|
|
* points here
|
3931 |
|
|
*/
|
3932 |
|
|
SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
|
3933 |
|
|
sctp_cmsgs_t *cmsgs)
|
3934 |
|
|
{
|
3935 |
|
|
struct cmsghdr *cmsg;
|
3936 |
|
|
|
3937 |
|
|
for (cmsg = CMSG_FIRSTHDR(msg);
|
3938 |
|
|
cmsg != NULL;
|
3939 |
|
|
cmsg = CMSG_NXTHDR((struct msghdr*)msg, cmsg)) {
|
3940 |
|
|
/* Check for minimum length. The SCM code has this check. */
|
3941 |
|
|
if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
|
3942 |
|
|
(unsigned long)(((char*)cmsg - (char*)msg->msg_control)
|
3943 |
|
|
+ cmsg->cmsg_len) > msg->msg_controllen) {
|
3944 |
|
|
return -EINVAL;
|
3945 |
|
|
}
|
3946 |
|
|
|
3947 |
|
|
/* Should we parse this header or ignore? */
|
3948 |
|
|
if (cmsg->cmsg_level != IPPROTO_SCTP)
|
3949 |
|
|
continue;
|
3950 |
|
|
|
3951 |
|
|
/* Strictly check lengths following example in SCM code. */
|
3952 |
|
|
switch (cmsg->cmsg_type) {
|
3953 |
|
|
case SCTP_INIT:
|
3954 |
|
|
/* SCTP Socket API Extension
|
3955 |
|
|
* 5.2.1 SCTP Initiation Structure (SCTP_INIT)
|
3956 |
|
|
*
|
3957 |
|
|
* This cmsghdr structure provides information for
|
3958 |
|
|
* initializing new SCTP associations with sendmsg().
|
3959 |
|
|
* The SCTP_INITMSG socket option uses this same data
|
3960 |
|
|
* structure. This structure is not used for
|
3961 |
|
|
* recvmsg().
|
3962 |
|
|
*
|
3963 |
|
|
* cmsg_level cmsg_type cmsg_data[]
|
3964 |
|
|
* ------------ ------------ ----------------------
|
3965 |
|
|
* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
|
3966 |
|
|
*/
|
3967 |
|
|
if (cmsg->cmsg_len !=
|
3968 |
|
|
CMSG_LEN(sizeof(struct sctp_initmsg)))
|
3969 |
|
|
return -EINVAL;
|
3970 |
|
|
cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
|
3971 |
|
|
break;
|
3972 |
|
|
|
3973 |
|
|
case SCTP_SNDRCV:
|
3974 |
|
|
/* SCTP Socket API Extension
|
3975 |
|
|
* 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
|
3976 |
|
|
*
|
3977 |
|
|
* This cmsghdr structure specifies SCTP options for
|
3978 |
|
|
* sendmsg() and describes SCTP header information
|
3979 |
|
|
* about a received message through recvmsg().
|
3980 |
|
|
*
|
3981 |
|
|
* cmsg_level cmsg_type cmsg_data[]
|
3982 |
|
|
* ------------ ------------ ----------------------
|
3983 |
|
|
* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
|
3984 |
|
|
*/
|
3985 |
|
|
if (cmsg->cmsg_len !=
|
3986 |
|
|
CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
|
3987 |
|
|
return -EINVAL;
|
3988 |
|
|
|
3989 |
|
|
cmsgs->info =
|
3990 |
|
|
(struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
|
3991 |
|
|
|
3992 |
|
|
/* Minimally, validate the sinfo_flags. */
|
3993 |
|
|
if (cmsgs->info->sinfo_flags &
|
3994 |
|
|
~(MSG_UNORDERED | MSG_ADDR_OVER |
|
3995 |
|
|
MSG_ABORT | MSG_EOF))
|
3996 |
|
|
return -EINVAL;
|
3997 |
|
|
break;
|
3998 |
|
|
|
3999 |
|
|
default:
|
4000 |
|
|
return -EINVAL;
|
4001 |
|
|
};
|
4002 |
|
|
}
|
4003 |
|
|
return 0;
|
4004 |
|
|
}
|
4005 |
|
|
|
4006 |
|
|
/*
|
4007 |
|
|
* Wait for a packet..
|
4008 |
|
|
* Note: This function is the same function as in core/datagram.c
|
4009 |
|
|
* with a few modifications to make lksctp work.
|
4010 |
|
|
*/
|
4011 |
|
|
static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
|
4012 |
|
|
{
|
4013 |
|
|
int error;
|
4014 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
4015 |
|
|
|
4016 |
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
4017 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
4018 |
|
|
|
4019 |
|
|
/* Socket errors? */
|
4020 |
|
|
error = sock_error(sk);
|
4021 |
|
|
if (error)
|
4022 |
|
|
goto out;
|
4023 |
|
|
|
4024 |
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
4025 |
|
|
goto ready;
|
4026 |
|
|
|
4027 |
|
|
/* Socket shut down? */
|
4028 |
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
4029 |
|
|
goto out;
|
4030 |
|
|
|
4031 |
|
|
/* Sequenced packets can come disconnected. If so we report the
|
4032 |
|
|
* problem.
|
4033 |
|
|
*/
|
4034 |
|
|
error = -ENOTCONN;
|
4035 |
|
|
|
4036 |
|
|
/* Is there a good reason to think that we may receive some data? */
|
4037 |
|
|
if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
|
4038 |
|
|
goto out;
|
4039 |
|
|
|
4040 |
|
|
/* Handle signals. */
|
4041 |
|
|
if (signal_pending(current))
|
4042 |
|
|
goto interrupted;
|
4043 |
|
|
|
4044 |
|
|
/* Let another process have a go. Since we are going to sleep
|
4045 |
|
|
* anyway. Note: This may cause odd behaviors if the message
|
4046 |
|
|
* does not fit in the user's buffer, but this seems to be the
|
4047 |
|
|
* only way to honor MSG_DONTWAIT realistically.
|
4048 |
|
|
*/
|
4049 |
|
|
sctp_release_sock(sk);
|
4050 |
|
|
*timeo_p = schedule_timeout(*timeo_p);
|
4051 |
|
|
sctp_lock_sock(sk);
|
4052 |
|
|
|
4053 |
|
|
ready:
|
4054 |
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
4055 |
|
|
__set_current_state(TASK_RUNNING);
|
4056 |
|
|
return 0;
|
4057 |
|
|
|
4058 |
|
|
interrupted:
|
4059 |
|
|
error = sock_intr_errno(*timeo_p);
|
4060 |
|
|
|
4061 |
|
|
out:
|
4062 |
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
4063 |
|
|
__set_current_state(TASK_RUNNING);
|
4064 |
|
|
*err = error;
|
4065 |
|
|
return error;
|
4066 |
|
|
}
|
4067 |
|
|
|
4068 |
|
|
/* Receive a datagram.
|
4069 |
|
|
* Note: This is pretty much the same routine as in core/datagram.c
|
4070 |
|
|
* with a few changes to make lksctp work.
|
4071 |
|
|
*/
|
4072 |
|
|
static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
|
4073 |
|
|
int noblock, int *err)
|
4074 |
|
|
{
|
4075 |
|
|
int error;
|
4076 |
|
|
struct sk_buff *skb;
|
4077 |
|
|
long timeo;
|
4078 |
|
|
|
4079 |
|
|
/* Caller is allowed not to check sk->sk_err before calling. */
|
4080 |
|
|
error = sock_error(sk);
|
4081 |
|
|
if (error)
|
4082 |
|
|
goto no_packet;
|
4083 |
|
|
|
4084 |
|
|
timeo = sock_rcvtimeo(sk, noblock);
|
4085 |
|
|
|
4086 |
|
|
SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
|
4087 |
|
|
timeo, MAX_SCHEDULE_TIMEOUT);
|
4088 |
|
|
|
4089 |
|
|
do {
|
4090 |
|
|
/* Again only user level code calls this function,
|
4091 |
|
|
* so nothing interrupt level
|
4092 |
|
|
* will suddenly eat the receive_queue.
|
4093 |
|
|
*
|
4094 |
|
|
* Look at current nfs client by the way...
|
4095 |
|
|
* However, this function was corrent in any case. 8)
|
4096 |
|
|
*/
|
4097 |
|
|
if (flags & MSG_PEEK) {
|
4098 |
|
|
unsigned long cpu_flags;
|
4099 |
|
|
|
4100 |
|
|
sctp_spin_lock_irqsave(&sk->sk_receive_queue.lock,
|
4101 |
|
|
cpu_flags);
|
4102 |
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
4103 |
|
|
if (skb)
|
4104 |
|
|
atomic_inc(&skb->users);
|
4105 |
|
|
sctp_spin_unlock_irqrestore(&sk->sk_receive_queue.lock,
|
4106 |
|
|
cpu_flags);
|
4107 |
|
|
} else {
|
4108 |
|
|
skb = skb_dequeue(&sk->sk_receive_queue);
|
4109 |
|
|
}
|
4110 |
|
|
|
4111 |
|
|
if (skb)
|
4112 |
|
|
return skb;
|
4113 |
|
|
|
4114 |
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
4115 |
|
|
break;
|
4116 |
|
|
|
4117 |
|
|
/* User doesn't want to wait. */
|
4118 |
|
|
error = -EAGAIN;
|
4119 |
|
|
if (!timeo)
|
4120 |
|
|
goto no_packet;
|
4121 |
|
|
} while (sctp_wait_for_packet(sk, err, &timeo) == 0);
|
4122 |
|
|
|
4123 |
|
|
return NULL;
|
4124 |
|
|
|
4125 |
|
|
no_packet:
|
4126 |
|
|
*err = error;
|
4127 |
|
|
return NULL;
|
4128 |
|
|
}
|
4129 |
|
|
|
4130 |
|
|
/* Verify that this is a valid address. */
|
4131 |
|
|
static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
|
4132 |
|
|
int len)
|
4133 |
|
|
{
|
4134 |
|
|
struct sctp_af *af;
|
4135 |
|
|
|
4136 |
|
|
/* Verify basic sockaddr. */
|
4137 |
|
|
af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
|
4138 |
|
|
if (!af)
|
4139 |
|
|
return -EINVAL;
|
4140 |
|
|
|
4141 |
|
|
/* Is this a valid SCTP address? */
|
4142 |
|
|
if (!af->addr_valid(addr, sctp_sk(sk)))
|
4143 |
|
|
return -EINVAL;
|
4144 |
|
|
|
4145 |
|
|
if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
|
4146 |
|
|
return -EINVAL;
|
4147 |
|
|
|
4148 |
|
|
return 0;
|
4149 |
|
|
}
|
4150 |
|
|
|
4151 |
|
|
/* Get the sndbuf space available at the time on the association. */
|
4152 |
|
|
static inline int sctp_wspace(struct sctp_association *asoc)
|
4153 |
|
|
{
|
4154 |
|
|
struct sock *sk = asoc->base.sk;
|
4155 |
|
|
int amt = 0;
|
4156 |
|
|
|
4157 |
|
|
amt = sk->sk_sndbuf - asoc->sndbuf_used;
|
4158 |
|
|
if (amt < 0)
|
4159 |
|
|
amt = 0;
|
4160 |
|
|
return amt;
|
4161 |
|
|
}
|
4162 |
|
|
|
4163 |
|
|
/* Increment the used sndbuf space count of the corresponding association by
|
4164 |
|
|
* the size of the outgoing data chunk.
|
4165 |
|
|
* Also, set the skb destructor for sndbuf accounting later.
|
4166 |
|
|
*
|
4167 |
|
|
* Since it is always 1-1 between chunk and skb, and also a new skb is always
|
4168 |
|
|
* allocated for chunk bundling in sctp_packet_transmit(), we can use the
|
4169 |
|
|
* destructor in the data chunk skb for the purpose of the sndbuf space
|
4170 |
|
|
* tracking.
|
4171 |
|
|
*/
|
4172 |
|
|
static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
|
4173 |
|
|
{
|
4174 |
|
|
struct sctp_association *asoc = chunk->asoc;
|
4175 |
|
|
struct sock *sk = asoc->base.sk;
|
4176 |
|
|
|
4177 |
|
|
/* The sndbuf space is tracked per association. */
|
4178 |
|
|
sctp_association_hold(asoc);
|
4179 |
|
|
|
4180 |
|
|
chunk->skb->destructor = sctp_wfree;
|
4181 |
|
|
/* Save the chunk pointer in skb for sctp_wfree to use later. */
|
4182 |
|
|
*((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
|
4183 |
|
|
|
4184 |
|
|
asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk);
|
4185 |
|
|
sk->sk_wmem_queued += SCTP_DATA_SNDSIZE(chunk);
|
4186 |
|
|
}
|
4187 |
|
|
|
4188 |
|
|
/* If sndbuf has changed, wake up per association sndbuf waiters. */
|
4189 |
|
|
static void __sctp_write_space(struct sctp_association *asoc)
|
4190 |
|
|
{
|
4191 |
|
|
struct sock *sk = asoc->base.sk;
|
4192 |
|
|
struct socket *sock = sk->sk_socket;
|
4193 |
|
|
|
4194 |
|
|
if ((sctp_wspace(asoc) > 0) && sock) {
|
4195 |
|
|
if (waitqueue_active(&asoc->wait))
|
4196 |
|
|
wake_up_interruptible(&asoc->wait);
|
4197 |
|
|
|
4198 |
|
|
if (sctp_writeable(sk)) {
|
4199 |
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
4200 |
|
|
wake_up_interruptible(sk->sk_sleep);
|
4201 |
|
|
|
4202 |
|
|
/* Note that we try to include the Async I/O support
|
4203 |
|
|
* here by modeling from the current TCP/UDP code.
|
4204 |
|
|
* We have not tested with it yet.
|
4205 |
|
|
*/
|
4206 |
|
|
if (sock->fasync_list &&
|
4207 |
|
|
!(sk->sk_shutdown & SEND_SHUTDOWN))
|
4208 |
|
|
sock_wake_async(sock, 2, POLL_OUT);
|
4209 |
|
|
}
|
4210 |
|
|
}
|
4211 |
|
|
}
|
4212 |
|
|
|
4213 |
|
|
/* Do accounting for the sndbuf space.
|
4214 |
|
|
* Decrement the used sndbuf space of the corresponding association by the
|
4215 |
|
|
* data size which was just transmitted(freed).
|
4216 |
|
|
*/
|
4217 |
|
|
static void sctp_wfree(struct sk_buff *skb)
|
4218 |
|
|
{
|
4219 |
|
|
struct sctp_association *asoc;
|
4220 |
|
|
struct sctp_chunk *chunk;
|
4221 |
|
|
struct sock *sk;
|
4222 |
|
|
|
4223 |
|
|
/* Get the saved chunk pointer. */
|
4224 |
|
|
chunk = *((struct sctp_chunk **)(skb->cb));
|
4225 |
|
|
asoc = chunk->asoc;
|
4226 |
|
|
sk = asoc->base.sk;
|
4227 |
|
|
asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk);
|
4228 |
|
|
sk->sk_wmem_queued -= SCTP_DATA_SNDSIZE(chunk);
|
4229 |
|
|
__sctp_write_space(asoc);
|
4230 |
|
|
|
4231 |
|
|
sctp_association_put(asoc);
|
4232 |
|
|
}
|
4233 |
|
|
|
4234 |
|
|
/* Helper function to wait for space in the sndbuf. */
|
4235 |
|
|
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
|
4236 |
|
|
size_t msg_len)
|
4237 |
|
|
{
|
4238 |
|
|
struct sock *sk = asoc->base.sk;
|
4239 |
|
|
int err = 0;
|
4240 |
|
|
long current_timeo = *timeo_p;
|
4241 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
4242 |
|
|
|
4243 |
|
|
SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%u\n",
|
4244 |
|
|
asoc, (long)(*timeo_p), msg_len);
|
4245 |
|
|
|
4246 |
|
|
/* Increment the association's refcnt. */
|
4247 |
|
|
sctp_association_hold(asoc);
|
4248 |
|
|
|
4249 |
|
|
/* Wait on the association specific sndbuf space. */
|
4250 |
|
|
add_wait_queue_exclusive(&asoc->wait, &wait);
|
4251 |
|
|
|
4252 |
|
|
/* Wait on the association specific sndbuf space. */
|
4253 |
|
|
for (;;) {
|
4254 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
4255 |
|
|
if (!*timeo_p)
|
4256 |
|
|
goto do_nonblock;
|
4257 |
|
|
if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
|
4258 |
|
|
asoc->base.dead)
|
4259 |
|
|
goto do_error;
|
4260 |
|
|
if (signal_pending(current))
|
4261 |
|
|
goto do_interrupted;
|
4262 |
|
|
if (msg_len <= sctp_wspace(asoc))
|
4263 |
|
|
break;
|
4264 |
|
|
|
4265 |
|
|
/* Let another process have a go. Since we are going
|
4266 |
|
|
* to sleep anyway.
|
4267 |
|
|
*/
|
4268 |
|
|
sctp_release_sock(sk);
|
4269 |
|
|
current_timeo = schedule_timeout(current_timeo);
|
4270 |
|
|
sctp_lock_sock(sk);
|
4271 |
|
|
|
4272 |
|
|
*timeo_p = current_timeo;
|
4273 |
|
|
}
|
4274 |
|
|
|
4275 |
|
|
out:
|
4276 |
|
|
remove_wait_queue(&asoc->wait, &wait);
|
4277 |
|
|
__set_current_state(TASK_RUNNING);
|
4278 |
|
|
|
4279 |
|
|
/* Release the association's refcnt. */
|
4280 |
|
|
sctp_association_put(asoc);
|
4281 |
|
|
|
4282 |
|
|
return err;
|
4283 |
|
|
|
4284 |
|
|
do_error:
|
4285 |
|
|
err = -EPIPE;
|
4286 |
|
|
goto out;
|
4287 |
|
|
|
4288 |
|
|
do_interrupted:
|
4289 |
|
|
err = sock_intr_errno(*timeo_p);
|
4290 |
|
|
goto out;
|
4291 |
|
|
|
4292 |
|
|
do_nonblock:
|
4293 |
|
|
err = -EAGAIN;
|
4294 |
|
|
goto out;
|
4295 |
|
|
}
|
4296 |
|
|
|
4297 |
|
|
/* If socket sndbuf has changed, wake up all per association waiters. */
|
4298 |
|
|
void sctp_write_space(struct sock *sk)
|
4299 |
|
|
{
|
4300 |
|
|
struct sctp_association *asoc;
|
4301 |
|
|
struct list_head *pos;
|
4302 |
|
|
|
4303 |
|
|
/* Wake up the tasks in each wait queue. */
|
4304 |
|
|
list_for_each(pos, &((sctp_sk(sk))->ep->asocs)) {
|
4305 |
|
|
asoc = list_entry(pos, struct sctp_association, asocs);
|
4306 |
|
|
__sctp_write_space(asoc);
|
4307 |
|
|
}
|
4308 |
|
|
}
|
4309 |
|
|
|
4310 |
|
|
/* Is there any sndbuf space available on the socket?
|
4311 |
|
|
*
|
4312 |
|
|
* Note that wmem_queued is the sum of the send buffers on all of the
|
4313 |
|
|
* associations on the same socket. For a UDP-style socket with
|
4314 |
|
|
* multiple associations, it is possible for it to be "unwriteable"
|
4315 |
|
|
* prematurely. I assume that this is acceptable because
|
4316 |
|
|
* a premature "unwriteable" is better than an accidental "writeable" which
|
4317 |
|
|
* would cause an unwanted block under certain circumstances. For the 1-1
|
4318 |
|
|
* UDP-style sockets or TCP-style sockets, this code should work.
|
4319 |
|
|
* - Daisy
|
4320 |
|
|
*/
|
4321 |
|
|
static int sctp_writeable(struct sock *sk)
|
4322 |
|
|
{
|
4323 |
|
|
int amt = 0;
|
4324 |
|
|
|
4325 |
|
|
amt = sk->sk_sndbuf - sk->sk_wmem_queued;
|
4326 |
|
|
if (amt < 0)
|
4327 |
|
|
amt = 0;
|
4328 |
|
|
return amt;
|
4329 |
|
|
}
|
4330 |
|
|
|
4331 |
|
|
/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
|
4332 |
|
|
* returns immediately with EINPROGRESS.
|
4333 |
|
|
*/
|
4334 |
|
|
static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
|
4335 |
|
|
{
|
4336 |
|
|
struct sock *sk = asoc->base.sk;
|
4337 |
|
|
int err = 0;
|
4338 |
|
|
long current_timeo = *timeo_p;
|
4339 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
4340 |
|
|
|
4341 |
|
|
SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__, asoc,
|
4342 |
|
|
(long)(*timeo_p));
|
4343 |
|
|
|
4344 |
|
|
/* Increment the association's refcnt. */
|
4345 |
|
|
sctp_association_hold(asoc);
|
4346 |
|
|
|
4347 |
|
|
add_wait_queue_exclusive(&asoc->wait, &wait);
|
4348 |
|
|
for (;;) {
|
4349 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
4350 |
|
|
if (!*timeo_p)
|
4351 |
|
|
goto do_nonblock;
|
4352 |
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
4353 |
|
|
break;
|
4354 |
|
|
if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
|
4355 |
|
|
asoc->base.dead)
|
4356 |
|
|
goto do_error;
|
4357 |
|
|
if (signal_pending(current))
|
4358 |
|
|
goto do_interrupted;
|
4359 |
|
|
|
4360 |
|
|
if (sctp_state(asoc, ESTABLISHED))
|
4361 |
|
|
break;
|
4362 |
|
|
|
4363 |
|
|
/* Let another process have a go. Since we are going
|
4364 |
|
|
* to sleep anyway.
|
4365 |
|
|
*/
|
4366 |
|
|
sctp_release_sock(sk);
|
4367 |
|
|
current_timeo = schedule_timeout(current_timeo);
|
4368 |
|
|
sctp_lock_sock(sk);
|
4369 |
|
|
|
4370 |
|
|
*timeo_p = current_timeo;
|
4371 |
|
|
}
|
4372 |
|
|
|
4373 |
|
|
out:
|
4374 |
|
|
remove_wait_queue(&asoc->wait, &wait);
|
4375 |
|
|
__set_current_state(TASK_RUNNING);
|
4376 |
|
|
|
4377 |
|
|
/* Release the association's refcnt. */
|
4378 |
|
|
sctp_association_put(asoc);
|
4379 |
|
|
|
4380 |
|
|
return err;
|
4381 |
|
|
|
4382 |
|
|
do_error:
|
4383 |
|
|
err = -ECONNREFUSED;
|
4384 |
|
|
goto out;
|
4385 |
|
|
|
4386 |
|
|
do_interrupted:
|
4387 |
|
|
err = sock_intr_errno(*timeo_p);
|
4388 |
|
|
goto out;
|
4389 |
|
|
|
4390 |
|
|
do_nonblock:
|
4391 |
|
|
err = -EINPROGRESS;
|
4392 |
|
|
goto out;
|
4393 |
|
|
}
|
4394 |
|
|
|
4395 |
|
|
static int sctp_wait_for_accept(struct sock *sk, long timeo)
|
4396 |
|
|
{
|
4397 |
|
|
struct sctp_endpoint *ep;
|
4398 |
|
|
int err = 0;
|
4399 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
4400 |
|
|
|
4401 |
|
|
ep = sctp_sk(sk)->ep;
|
4402 |
|
|
|
4403 |
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
4404 |
|
|
|
4405 |
|
|
for (;;) {
|
4406 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
4407 |
|
|
if (list_empty(&ep->asocs)) {
|
4408 |
|
|
sctp_release_sock(sk);
|
4409 |
|
|
timeo = schedule_timeout(timeo);
|
4410 |
|
|
sctp_lock_sock(sk);
|
4411 |
|
|
}
|
4412 |
|
|
|
4413 |
|
|
err = -EINVAL;
|
4414 |
|
|
if (!sctp_sstate(sk, LISTENING))
|
4415 |
|
|
break;
|
4416 |
|
|
|
4417 |
|
|
err = 0;
|
4418 |
|
|
if (!list_empty(&ep->asocs))
|
4419 |
|
|
break;
|
4420 |
|
|
|
4421 |
|
|
err = sock_intr_errno(timeo);
|
4422 |
|
|
if (signal_pending(current))
|
4423 |
|
|
break;
|
4424 |
|
|
|
4425 |
|
|
err = -EAGAIN;
|
4426 |
|
|
if (!timeo)
|
4427 |
|
|
break;
|
4428 |
|
|
}
|
4429 |
|
|
|
4430 |
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
4431 |
|
|
__set_current_state(TASK_RUNNING);
|
4432 |
|
|
|
4433 |
|
|
return err;
|
4434 |
|
|
}
|
4435 |
|
|
|
4436 |
|
|
void sctp_wait_for_close(struct sock *sk, long timeout)
|
4437 |
|
|
{
|
4438 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
4439 |
|
|
|
4440 |
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
4441 |
|
|
|
4442 |
|
|
do {
|
4443 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
4444 |
|
|
if (list_empty(&sctp_sk(sk)->ep->asocs))
|
4445 |
|
|
break;
|
4446 |
|
|
sctp_release_sock(sk);
|
4447 |
|
|
timeout = schedule_timeout(timeout);
|
4448 |
|
|
sctp_lock_sock(sk);
|
4449 |
|
|
} while (!signal_pending(current) && timeout);
|
4450 |
|
|
|
4451 |
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
4452 |
|
|
__set_current_state(TASK_RUNNING);
|
4453 |
|
|
}
|
4454 |
|
|
|
4455 |
|
|
/* Populate the fields of the newsk from the oldsk and migrate the assoc
|
4456 |
|
|
* and its messages to the newsk.
|
4457 |
|
|
*/
|
4458 |
|
|
static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
|
4459 |
|
|
struct sctp_association *assoc,
|
4460 |
|
|
sctp_socket_type_t type)
|
4461 |
|
|
{
|
4462 |
|
|
struct sctp_opt *oldsp = sctp_sk(oldsk);
|
4463 |
|
|
struct sctp_opt *newsp = sctp_sk(newsk);
|
4464 |
|
|
struct sctp_endpoint *newep = newsp->ep;
|
4465 |
|
|
struct sk_buff *skb, *tmp;
|
4466 |
|
|
struct sctp_ulpevent *event;
|
4467 |
|
|
|
4468 |
|
|
/* Migrate socket buffer sizes and all the socket level options to the
|
4469 |
|
|
* new socket.
|
4470 |
|
|
*/
|
4471 |
|
|
newsk->sk_sndbuf = oldsk->sk_sndbuf;
|
4472 |
|
|
newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
|
4473 |
|
|
/* Brute force copy old sctp opt. */
|
4474 |
|
|
memcpy(newsp, oldsp, sizeof(struct sctp_opt));
|
4475 |
|
|
|
4476 |
|
|
/* Restore the ep value that was overwritten with the above structure
|
4477 |
|
|
* copy.
|
4478 |
|
|
*/
|
4479 |
|
|
newsp->ep = newep;
|
4480 |
|
|
newsp->hmac = NULL;
|
4481 |
|
|
|
4482 |
|
|
newsk->num = oldsk->num;
|
4483 |
|
|
|
4484 |
|
|
/* Move any messages in the old socket's receive queue that are for the
|
4485 |
|
|
* peeled off association to the new socket's receive queue.
|
4486 |
|
|
*/
|
4487 |
|
|
sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
|
4488 |
|
|
event = sctp_skb2event(skb);
|
4489 |
|
|
if (event->sndrcvinfo.sinfo_assoc_id == assoc) {
|
4490 |
|
|
__skb_unlink(skb, skb->list);
|
4491 |
|
|
__skb_queue_tail(&newsk->sk_receive_queue, skb);
|
4492 |
|
|
}
|
4493 |
|
|
}
|
4494 |
|
|
|
4495 |
|
|
/* Clean up any messages pending delivery due to partial
|
4496 |
|
|
* delivery. Three cases:
|
4497 |
|
|
* 1) No partial deliver; no work.
|
4498 |
|
|
* 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
|
4499 |
|
|
* 3) Peeling off non-partial delivery; move pd_lobby to recieve_queue.
|
4500 |
|
|
*/
|
4501 |
|
|
skb_queue_head_init(&newsp->pd_lobby);
|
4502 |
|
|
sctp_sk(newsk)->pd_mode = assoc->ulpq.pd_mode;;
|
4503 |
|
|
|
4504 |
|
|
if (sctp_sk(oldsk)->pd_mode) {
|
4505 |
|
|
struct sk_buff_head *queue;
|
4506 |
|
|
|
4507 |
|
|
/* Decide which queue to move pd_lobby skbs to. */
|
4508 |
|
|
if (assoc->ulpq.pd_mode) {
|
4509 |
|
|
queue = &newsp->pd_lobby;
|
4510 |
|
|
} else
|
4511 |
|
|
queue = &newsk->sk_receive_queue;
|
4512 |
|
|
|
4513 |
|
|
/* Walk through the pd_lobby, looking for skbs that
|
4514 |
|
|
* need moved to the new socket.
|
4515 |
|
|
*/
|
4516 |
|
|
sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
|
4517 |
|
|
event = sctp_skb2event(skb);
|
4518 |
|
|
if (event->sndrcvinfo.sinfo_assoc_id == assoc) {
|
4519 |
|
|
__skb_unlink(skb, skb->list);
|
4520 |
|
|
__skb_queue_tail(queue, skb);
|
4521 |
|
|
}
|
4522 |
|
|
}
|
4523 |
|
|
|
4524 |
|
|
/* Clear up any skbs waiting for the partial
|
4525 |
|
|
* delivery to finish.
|
4526 |
|
|
*/
|
4527 |
|
|
if (assoc->ulpq.pd_mode)
|
4528 |
|
|
sctp_clear_pd(oldsk);
|
4529 |
|
|
|
4530 |
|
|
}
|
4531 |
|
|
|
4532 |
|
|
/* Set the type of socket to indicate that it is peeled off from the
|
4533 |
|
|
* original UDP-style socket or created with the accept() call on a
|
4534 |
|
|
* TCP-style socket..
|
4535 |
|
|
*/
|
4536 |
|
|
newsp->type = type;
|
4537 |
|
|
|
4538 |
|
|
/* Migrate the association to the new socket. */
|
4539 |
|
|
sctp_assoc_migrate(assoc, newsk);
|
4540 |
|
|
|
4541 |
|
|
/* If the association on the newsk is already closed before accept()
|
4542 |
|
|
* is called, set RCV_SHUTDOWN flag.
|
4543 |
|
|
*/
|
4544 |
|
|
if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
|
4545 |
|
|
newsk->sk_shutdown |= RCV_SHUTDOWN;
|
4546 |
|
|
|
4547 |
|
|
newsk->sk_state = SCTP_SS_ESTABLISHED;
|
4548 |
|
|
}
|
4549 |
|
|
|
4550 |
|
|
/* This proto struct describes the ULP interface for SCTP. */
|
4551 |
|
|
struct proto sctp_prot = {
|
4552 |
|
|
.name = "SCTP",
|
4553 |
|
|
.close = sctp_close,
|
4554 |
|
|
.connect = sctp_connect,
|
4555 |
|
|
.disconnect = sctp_disconnect,
|
4556 |
|
|
.accept = sctp_accept,
|
4557 |
|
|
.ioctl = sctp_ioctl,
|
4558 |
|
|
.init = sctp_init_sock,
|
4559 |
|
|
.destroy = sctp_destroy_sock,
|
4560 |
|
|
.shutdown = sctp_shutdown,
|
4561 |
|
|
.setsockopt = sctp_setsockopt,
|
4562 |
|
|
.getsockopt = sctp_getsockopt,
|
4563 |
|
|
.sendmsg = sctp_sendmsg,
|
4564 |
|
|
.recvmsg = sctp_recvmsg,
|
4565 |
|
|
.bind = sctp_bind,
|
4566 |
|
|
.backlog_rcv = sctp_backlog_rcv,
|
4567 |
|
|
.hash = sctp_hash,
|
4568 |
|
|
.unhash = sctp_unhash,
|
4569 |
|
|
.get_port = sctp_get_port,
|
4570 |
|
|
};
|