613 lines
18 KiB
C
613 lines
18 KiB
C
/* 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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*
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* This file is part of the SCTP kernel reference Implementation
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*
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* The base lksctp header.
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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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* Xingang Guo <xingang.guo@intel.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Sridhar Samudrala <sri@us.ibm.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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* 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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#ifndef __net_sctp_h__
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#define __net_sctp_h__
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/* Header Strategy.
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* Start getting some control over the header file depencies:
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* includes
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* constants
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* structs
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* prototypes
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* macros, externs, and inlines
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*
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* Move test_frame specific items out of the kernel headers
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* and into the test frame headers. This is not perfect in any sense
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* and will continue to evolve.
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*/
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#ifdef TEST_FRAME
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#undef CONFIG_PROC_FS
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#undef CONFIG_SCTP_DBG_OBJCNT
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#undef CONFIG_SYSCTL
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#endif /* TEST_FRAME */
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/in.h>
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#include <linux/tty.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <linux/jiffies.h>
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#include <linux/idr.h>
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#endif
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/sctp/structs.h>
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#include <net/sctp/constants.h>
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/* Set SCTP_DEBUG flag via config if not already set. */
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#ifndef SCTP_DEBUG
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#ifdef CONFIG_SCTP_DBG_MSG
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#define SCTP_DEBUG 1
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#else
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#define SCTP_DEBUG 0
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#endif /* CONFIG_SCTP_DBG */
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#endif /* SCTP_DEBUG */
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#ifdef CONFIG_IP_SCTP_MODULE
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#define SCTP_PROTOSW_FLAG 0
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#else /* static! */
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#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
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#endif
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/* Certain internal static functions need to be exported when
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* compiled into the test frame.
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*/
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#ifndef SCTP_STATIC
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#define SCTP_STATIC static
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#endif
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/*
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* Function declarations.
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*/
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/*
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* sctp/protocol.c
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*/
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extern struct sock *sctp_get_ctl_sock(void);
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extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
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sctp_scope_t, gfp_t gfp,
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int flags);
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extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
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extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
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/*
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* sctp/socket.c
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*/
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int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
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int sctp_inet_listen(struct socket *sock, int backlog);
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void sctp_write_space(struct sock *sk);
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unsigned int sctp_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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/*
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* sctp/primitive.c
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*/
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int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
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int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
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int sctp_primitive_ABORT(struct sctp_association *, void *arg);
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int sctp_primitive_SEND(struct sctp_association *, void *arg);
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int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
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int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
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/*
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* sctp/crc32c.c
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*/
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__u32 sctp_start_cksum(__u8 *ptr, __u16 count);
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__u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
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__u32 sctp_end_cksum(__u32 cksum);
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__u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum);
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/*
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* sctp/input.c
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*/
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int sctp_rcv(struct sk_buff *skb);
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void sctp_v4_err(struct sk_buff *skb, u32 info);
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void sctp_hash_established(struct sctp_association *);
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void sctp_unhash_established(struct sctp_association *);
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void sctp_hash_endpoint(struct sctp_endpoint *);
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void sctp_unhash_endpoint(struct sctp_endpoint *);
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struct sock *sctp_err_lookup(int family, struct sk_buff *,
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struct sctphdr *, struct sctp_association **,
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struct sctp_transport **);
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void sctp_err_finish(struct sock *, struct sctp_association *);
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void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
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struct sctp_transport *t, __u32 pmtu);
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void sctp_icmp_proto_unreachable(struct sock *sk,
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struct sctp_association *asoc,
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struct sctp_transport *t);
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void sctp_backlog_migrate(struct sctp_association *assoc,
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struct sock *oldsk, struct sock *newsk);
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/*
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* Section: Macros, externs, and inlines
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*/
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#ifdef TEST_FRAME
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#include <test_frame.h>
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#else
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/* spin lock wrappers. */
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#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
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#define sctp_spin_unlock_irqrestore(lock, flags) \
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spin_unlock_irqrestore(lock, flags)
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#define sctp_local_bh_disable() local_bh_disable()
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#define sctp_local_bh_enable() local_bh_enable()
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#define sctp_spin_lock(lock) spin_lock(lock)
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#define sctp_spin_unlock(lock) spin_unlock(lock)
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#define sctp_write_lock(lock) write_lock(lock)
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#define sctp_write_unlock(lock) write_unlock(lock)
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#define sctp_read_lock(lock) read_lock(lock)
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#define sctp_read_unlock(lock) read_unlock(lock)
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/* sock lock wrappers. */
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#define sctp_lock_sock(sk) lock_sock(sk)
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#define sctp_release_sock(sk) release_sock(sk)
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#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
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#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
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#define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk)
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#define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk)
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/* SCTP SNMP MIB stats handlers */
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DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
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#define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
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#define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
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#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
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#define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
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#endif /* !TEST_FRAME */
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/* Print debugging messages. */
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#if SCTP_DEBUG
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extern int sctp_debug_flag;
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#define SCTP_DEBUG_PRINTK(whatever...) \
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((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
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#define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
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if (sctp_debug_flag) { \
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if (saddr->sa.sa_family == AF_INET6) { \
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printk(KERN_DEBUG \
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lead NIP6_FMT trail, \
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leadparm, \
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NIP6(saddr->v6.sin6_addr), \
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otherparms); \
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} else { \
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printk(KERN_DEBUG \
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lead NIPQUAD_FMT trail, \
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leadparm, \
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NIPQUAD(saddr->v4.sin_addr.s_addr), \
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otherparms); \
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} \
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}
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#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
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#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
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#define SCTP_ASSERT(expr, str, func) \
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if (!(expr)) { \
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SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
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str, (#expr), __FILE__, __FUNCTION__, __LINE__); \
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func; \
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}
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#else /* SCTP_DEBUG */
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#define SCTP_DEBUG_PRINTK(whatever...)
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#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
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#define SCTP_ENABLE_DEBUG
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#define SCTP_DISABLE_DEBUG
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#define SCTP_ASSERT(expr, str, func)
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#endif /* SCTP_DEBUG */
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/*
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* Macros for keeping a global reference of object allocations.
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*/
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#ifdef CONFIG_SCTP_DBG_OBJCNT
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extern atomic_t sctp_dbg_objcnt_sock;
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extern atomic_t sctp_dbg_objcnt_ep;
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extern atomic_t sctp_dbg_objcnt_assoc;
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extern atomic_t sctp_dbg_objcnt_transport;
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extern atomic_t sctp_dbg_objcnt_chunk;
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extern atomic_t sctp_dbg_objcnt_bind_addr;
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extern atomic_t sctp_dbg_objcnt_bind_bucket;
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extern atomic_t sctp_dbg_objcnt_addr;
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extern atomic_t sctp_dbg_objcnt_ssnmap;
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extern atomic_t sctp_dbg_objcnt_datamsg;
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/* Macros to atomically increment/decrement objcnt counters. */
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#define SCTP_DBG_OBJCNT_INC(name) \
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atomic_inc(&sctp_dbg_objcnt_## name)
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#define SCTP_DBG_OBJCNT_DEC(name) \
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atomic_dec(&sctp_dbg_objcnt_## name)
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#define SCTP_DBG_OBJCNT(name) \
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atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
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/* Macro to help create new entries in in the global array of
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* objcnt counters.
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*/
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#define SCTP_DBG_OBJCNT_ENTRY(name) \
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{.label= #name, .counter= &sctp_dbg_objcnt_## name}
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void sctp_dbg_objcnt_init(void);
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void sctp_dbg_objcnt_exit(void);
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#else
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#define SCTP_DBG_OBJCNT_INC(name)
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#define SCTP_DBG_OBJCNT_DEC(name)
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static inline void sctp_dbg_objcnt_init(void) { return; }
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static inline void sctp_dbg_objcnt_exit(void) { return; }
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#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
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#if defined CONFIG_SYSCTL
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void sctp_sysctl_register(void);
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void sctp_sysctl_unregister(void);
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#else
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static inline void sctp_sysctl_register(void) { return; }
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static inline void sctp_sysctl_unregister(void) { return; }
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static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen, void **context) {
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return -ENOSYS;
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}
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#endif
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/* Size of Supported Address Parameter for 'x' address types. */
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#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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int sctp_v6_init(void);
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void sctp_v6_exit(void);
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#else /* #ifdef defined(CONFIG_IPV6) */
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static inline int sctp_v6_init(void) { return 0; }
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static inline void sctp_v6_exit(void) { return; }
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#endif /* #if defined(CONFIG_IPV6) */
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/* Map an association to an assoc_id. */
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static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
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{
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return (asoc?asoc->assoc_id:0);
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}
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/* Look up the association by its id. */
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struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
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/* A macro to walk a list of skbs. */
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#define sctp_skb_for_each(pos, head, tmp) \
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for (pos = (head)->next;\
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tmp = (pos)->next, pos != ((struct sk_buff *)(head));\
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pos = tmp)
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/* A helper to append an entire skb list (list) to another (head). */
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static inline void sctp_skb_list_tail(struct sk_buff_head *list,
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struct sk_buff_head *head)
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{
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unsigned long flags;
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sctp_spin_lock_irqsave(&head->lock, flags);
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sctp_spin_lock(&list->lock);
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list_splice((struct list_head *)list, (struct list_head *)head->prev);
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head->qlen += list->qlen;
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list->qlen = 0;
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sctp_spin_unlock(&list->lock);
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sctp_spin_unlock_irqrestore(&head->lock, flags);
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}
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/**
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* sctp_list_dequeue - remove from the head of the queue
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* @list: list to dequeue from
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*
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* Remove the head of the list. The head item is
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* returned or %NULL if the list is empty.
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*/
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static inline struct list_head *sctp_list_dequeue(struct list_head *list)
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{
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struct list_head *result = NULL;
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if (list->next != list) {
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result = list->next;
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list->next = result->next;
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list->next->prev = list;
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INIT_LIST_HEAD(result);
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}
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return result;
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}
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/* Tests if the list has one and only one entry. */
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static inline int sctp_list_single_entry(struct list_head *head)
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{
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return ((head->next != head) && (head->next == head->prev));
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}
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/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
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static inline __s32 sctp_jitter(__u32 rto)
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{
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static __u32 sctp_rand;
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__s32 ret;
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/* Avoid divide by zero. */
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if (!rto)
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rto = 1;
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sctp_rand += jiffies;
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sctp_rand ^= (sctp_rand << 12);
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sctp_rand ^= (sctp_rand >> 20);
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/* Choose random number from 0 to rto, then move to -50% ~ +50%
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* of rto.
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*/
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ret = sctp_rand % rto - (rto >> 1);
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return ret;
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}
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/* Break down data chunks at this point. */
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static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
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{
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int frag = pmtu;
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frag -= sp->pf->af->net_header_len;
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frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
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if (sp->user_frag)
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frag = min_t(int, frag, sp->user_frag);
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frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
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return frag;
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}
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/* Walk through a list of TLV parameters. Don't trust the
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* individual parameter lengths and instead depend on
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* the chunk length to indicate when to stop. Make sure
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* there is room for a param header too.
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*/
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#define sctp_walk_params(pos, chunk, member)\
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_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
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#define _sctp_walk_params(pos, chunk, end, member)\
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for (pos.v = chunk->member;\
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pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
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pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
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ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
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pos.v += WORD_ROUND(ntohs(pos.p->length)))
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#define sctp_walk_errors(err, chunk_hdr)\
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_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
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#define _sctp_walk_errors(err, chunk_hdr, end)\
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for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
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sizeof(sctp_chunkhdr_t));\
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(void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
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(void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
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ntohs(err->length) >= sizeof(sctp_errhdr_t); \
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err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
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|
|
|
#define sctp_walk_fwdtsn(pos, chunk)\
|
|
_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
|
|
|
|
#define _sctp_walk_fwdtsn(pos, chunk, end)\
|
|
for (pos = chunk->subh.fwdtsn_hdr->skip;\
|
|
(void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
|
|
pos++)
|
|
|
|
/* Round an int up to the next multiple of 4. */
|
|
#define WORD_ROUND(s) (((s)+3)&~3)
|
|
|
|
/* Make a new instance of type. */
|
|
#define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
|
|
|
|
/* Compare two timevals. */
|
|
#define tv_lt(s, t) \
|
|
(s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
|
|
|
|
/* Add tv1 to tv2. */
|
|
#define TIMEVAL_ADD(tv1, tv2) \
|
|
({ \
|
|
suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
|
|
time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
|
|
\
|
|
if (usecs >= 1000000) { \
|
|
usecs -= 1000000; \
|
|
secs++; \
|
|
} \
|
|
(tv2).tv_sec = secs; \
|
|
(tv2).tv_usec = usecs; \
|
|
})
|
|
|
|
/* External references. */
|
|
|
|
extern struct proto sctp_prot;
|
|
extern struct proto sctpv6_prot;
|
|
extern struct proc_dir_entry *proc_net_sctp;
|
|
void sctp_put_port(struct sock *sk);
|
|
|
|
extern struct idr sctp_assocs_id;
|
|
extern spinlock_t sctp_assocs_id_lock;
|
|
|
|
/* Static inline functions. */
|
|
|
|
/* Convert from an IP version number to an Address Family symbol. */
|
|
static inline int ipver2af(__u8 ipver)
|
|
{
|
|
switch (ipver) {
|
|
case 4:
|
|
return AF_INET;
|
|
case 6:
|
|
return AF_INET6;
|
|
default:
|
|
return 0;
|
|
};
|
|
}
|
|
|
|
/* Convert from an address parameter type to an address family. */
|
|
static inline int param_type2af(__u16 type)
|
|
{
|
|
switch (type) {
|
|
case SCTP_PARAM_IPV4_ADDRESS:
|
|
return AF_INET;
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
|
return AF_INET6;
|
|
default:
|
|
return 0;
|
|
};
|
|
}
|
|
|
|
/* Perform some sanity checks. */
|
|
static inline int sctp_sanity_check(void)
|
|
{
|
|
SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
|
|
sizeof(((struct sk_buff *)0)->cb),
|
|
"SCTP: ulpevent does not fit in skb!\n", return 0);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Warning: The following hash functions assume a power of two 'size'. */
|
|
/* This is the hash function for the SCTP port hash table. */
|
|
static inline int sctp_phashfn(__u16 lport)
|
|
{
|
|
return (lport & (sctp_port_hashsize - 1));
|
|
}
|
|
|
|
/* This is the hash function for the endpoint hash table. */
|
|
static inline int sctp_ep_hashfn(__u16 lport)
|
|
{
|
|
return (lport & (sctp_ep_hashsize - 1));
|
|
}
|
|
|
|
/* This is the hash function for the association hash table. */
|
|
static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
|
|
{
|
|
int h = (lport << 16) + rport;
|
|
h ^= h>>8;
|
|
return (h & (sctp_assoc_hashsize - 1));
|
|
}
|
|
|
|
/* This is the hash function for the association hash table. This is
|
|
* not used yet, but could be used as a better hash function when
|
|
* we have a vtag.
|
|
*/
|
|
static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
|
|
{
|
|
int h = (lport << 16) + rport;
|
|
h ^= vtag;
|
|
return (h & (sctp_assoc_hashsize-1));
|
|
}
|
|
|
|
/* Is a socket of this style? */
|
|
#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
|
|
static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
|
|
{
|
|
return sctp_sk(sk)->type == style;
|
|
}
|
|
|
|
/* Is the association in this state? */
|
|
#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
|
|
static inline int __sctp_state(const struct sctp_association *asoc,
|
|
sctp_state_t state)
|
|
{
|
|
return asoc->state == state;
|
|
}
|
|
|
|
/* Is the socket in this state? */
|
|
#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
|
|
static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
|
|
{
|
|
return sk->sk_state == state;
|
|
}
|
|
|
|
/* Map v4-mapped v6 address back to v4 address */
|
|
static inline void sctp_v6_map_v4(union sctp_addr *addr)
|
|
{
|
|
addr->v4.sin_family = AF_INET;
|
|
addr->v4.sin_port = addr->v6.sin6_port;
|
|
addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
|
|
}
|
|
|
|
/* Map v4 address to v4-mapped v6 address */
|
|
static inline void sctp_v4_map_v6(union sctp_addr *addr)
|
|
{
|
|
addr->v6.sin6_family = AF_INET6;
|
|
addr->v6.sin6_port = addr->v4.sin_port;
|
|
addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
|
|
addr->v6.sin6_addr.s6_addr32[0] = 0;
|
|
addr->v6.sin6_addr.s6_addr32[1] = 0;
|
|
addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
|
|
}
|
|
|
|
#endif /* __net_sctp_h__ */
|