sctp.h

优龙2410linux2.6.8内核源代码

/* SCTP kernel reference Implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2003 Intel Corp.
 *
 * This file is part of the SCTP kernel reference Implementation
 *
 * The base lksctp header.
 *
 * The SCTP reference implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * The SCTP reference implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <[e-mail]>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    La Monte H.P. Yarroll <[e-mail]>
 *    Xingang Guo           <[e-mail]>
 *    Jon Grimm             <[e-mail]>
 *    Daisy Chang           <[e-mail]>
 *    Sridhar Samudrala     <[e-mail]>
 *    Ardelle Fan           <[e-mail]>
 *    Ryan Layer            <[e-mail]>
 *    Kevin Gao             <[e-mail]> 
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#ifndef __net_sctp_h__
#define __net_sctp_h__

/* Header Strategy.
 *    Start getting some control over the header file depencies:
 *       includes
 *       constants
 *       structs
 *       prototypes
 *       macros, externs, and inlines
 *
 *   Move test_frame specific items out of the kernel headers
 *   and into the test frame headers.   This is not perfect in any sense
 *   and will continue to evolve.
 */


#include <linux/config.h>

#ifdef TEST_FRAME
#undef CONFIG_PROC_FS
#undef CONFIG_SCTP_DBG_OBJCNT
#undef CONFIG_SYSCTL
#endif /* TEST_FRAME */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/tty.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>
#include <linux/idr.h>

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <net/ipv6.h>
#include <net/ip6_route.h>
#endif

#include <asm/uaccess.h>
#include <asm/page.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/sctp/structs.h>
#include <net/sctp/constants.h>


/* Set SCTP_DEBUG flag via config if not already set. */
#ifndef SCTP_DEBUG
#ifdef CONFIG_SCTP_DBG_MSG
#define SCTP_DEBUG	1
#else
#define SCTP_DEBUG      0
#endif /* CONFIG_SCTP_DBG */
#endif /* SCTP_DEBUG */

#ifdef CONFIG_IP_SCTP_MODULE
#define SCTP_PROTOSW_FLAG 0
#else /* static! */
#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
#endif


/* Certain internal static functions need to be exported when
 * compiled into the test frame.
 */
#ifndef SCTP_STATIC
#define SCTP_STATIC static
#endif

/*
 * Function declarations.
 */

/*
 * sctp/protocol.c
 */
extern struct sock *sctp_get_ctl_sock(void);
extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
				     sctp_scope_t, int gfp, int flags);
extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
extern int sctp_register_pf(struct sctp_pf *, sa_family_t);

/*
 * sctp/socket.c
 */
int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
int sctp_inet_listen(struct socket *sock, int backlog);
void sctp_write_space(struct sock *sk);
unsigned int sctp_poll(struct file *file, struct socket *sock,
		poll_table *wait);

/*
 * sctp/primitive.c
 */
int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
int sctp_primitive_ABORT(struct sctp_association *, void *arg);
int sctp_primitive_SEND(struct sctp_association *, void *arg);
int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
int sctp_primitive_ASCONF(struct sctp_association *, void *arg);

/*
 * sctp/crc32c.c
 */
__u32 sctp_start_cksum(__u8 *ptr, __u16 count);
__u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
__u32 sctp_end_cksum(__u32 cksum);
__u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum);

/*
 * sctp/input.c
 */
int sctp_rcv(struct sk_buff *skb);
void sctp_v4_err(struct sk_buff *skb, u32 info);
void sctp_hash_established(struct sctp_association *);
void __sctp_hash_established(struct sctp_association *);
void sctp_unhash_established(struct sctp_association *);
void __sctp_unhash_established(struct sctp_association *);
void sctp_hash_endpoint(struct sctp_endpoint *);
void __sctp_hash_endpoint(struct sctp_endpoint *);
void sctp_unhash_endpoint(struct sctp_endpoint *);
void __sctp_unhash_endpoint(struct sctp_endpoint *);
struct sctp_association *__sctp_lookup_association(
	const union sctp_addr *,
	const union sctp_addr *,
	struct sctp_transport **);
struct sock *sctp_err_lookup(int family, struct sk_buff *,
			     struct sctphdr *, struct sctp_endpoint **,
			     struct sctp_association **,
			     struct sctp_transport **);
void sctp_err_finish(struct sock *, struct sctp_endpoint *,
			    struct sctp_association *);
void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
			   struct sctp_transport *t, __u32 pmtu);

/*
 *  Section:  Macros, externs, and inlines
 */


#ifdef TEST_FRAME
#include <test_frame.h>
#else

/* spin lock wrappers. */
#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
#define sctp_spin_unlock_irqrestore(lock, flags)  \
       spin_unlock_irqrestore(lock, flags)
#define sctp_local_bh_disable() local_bh_disable()
#define sctp_local_bh_enable()  local_bh_enable()
#define sctp_spin_lock(lock)    spin_lock(lock)
#define sctp_spin_unlock(lock)  spin_unlock(lock)
#define sctp_write_lock(lock)   write_lock(lock)
#define sctp_write_unlock(lock) write_unlock(lock)
#define sctp_read_lock(lock)    read_lock(lock)
#define sctp_read_unlock(lock)  read_unlock(lock)

/* sock lock wrappers. */
#define sctp_lock_sock(sk)       lock_sock(sk)
#define sctp_release_sock(sk)    release_sock(sk)
#define sctp_bh_lock_sock(sk)    bh_lock_sock(sk)
#define sctp_bh_unlock_sock(sk)  bh_unlock_sock(sk)
#define SCTP_SOCK_SLEEP_PRE(sk)  SOCK_SLEEP_PRE(sk)
#define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk)

/* SCTP SNMP MIB stats handlers */
DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
#define SCTP_INC_STATS(field)      SNMP_INC_STATS(sctp_statistics, field)
#define SCTP_INC_STATS_BH(field)   SNMP_INC_STATS_BH(sctp_statistics, field)
#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
#define SCTP_DEC_STATS(field)      SNMP_DEC_STATS(sctp_statistics, field)

#endif /* !TEST_FRAME */


/* Print debugging messages.  */
#if SCTP_DEBUG
extern int sctp_debug_flag;
#define SCTP_DEBUG_PRINTK(whatever...) \
	((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }

#define SCTP_ASSERT(expr, str, func) \
	if (!(expr)) { \
		SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
			str, (#expr), __FILE__, __FUNCTION__, __LINE__); \
		func; \
	}

#else	/* SCTP_DEBUG */

#define SCTP_DEBUG_PRINTK(whatever...)
#define SCTP_ENABLE_DEBUG
#define SCTP_DISABLE_DEBUG
#define SCTP_ASSERT(expr, str, func)

#endif /* SCTP_DEBUG */


/*
 * Macros for keeping a global reference of object allocations.
 */
#ifdef CONFIG_SCTP_DBG_OBJCNT

extern atomic_t sctp_dbg_objcnt_sock;
extern atomic_t sctp_dbg_objcnt_ep;
extern atomic_t sctp_dbg_objcnt_assoc;
extern atomic_t sctp_dbg_objcnt_transport;
extern atomic_t sctp_dbg_objcnt_chunk;
extern atomic_t sctp_dbg_objcnt_bind_addr;
extern atomic_t sctp_dbg_objcnt_bind_bucket;
extern atomic_t sctp_dbg_objcnt_addr;
extern atomic_t sctp_dbg_objcnt_ssnmap;
extern atomic_t sctp_dbg_objcnt_datamsg;

/* Macros to atomically increment/decrement objcnt counters.  */
#define SCTP_DBG_OBJCNT_INC(name) \
atomic_inc(&sctp_dbg_objcnt_## name)
#define SCTP_DBG_OBJCNT_DEC(name) \
atomic_dec(&sctp_dbg_objcnt_## name)
#define SCTP_DBG_OBJCNT(name) \
atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)

/* Macro to help create new entries in in the global array of
 * objcnt counters.
 */
#define SCTP_DBG_OBJCNT_ENTRY(name) \
{.label= #name, .counter= &sctp_dbg_objcnt_## name}

void sctp_dbg_objcnt_init(void);
void sctp_dbg_objcnt_exit(void);

#else

#define SCTP_DBG_OBJCNT_INC(name)
#define SCTP_DBG_OBJCNT_DEC(name)

static inline void sctp_dbg_objcnt_init(void) { return; }
static inline void sctp_dbg_objcnt_exit(void) { return; }

#endif /* CONFIG_SCTP_DBG_OBJCOUNT */

#if defined CONFIG_SYSCTL
void sctp_sysctl_register(void);
void sctp_sysctl_unregister(void);
#else
static inline void sctp_sysctl_register(void) { return; }
static inline void sctp_sysctl_unregister(void) { return; }
static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
		void __user *oldval, size_t __user *oldlenp,
		void __user *newval, size_t newlen, void **context) {
	return -ENOSYS;
}
#endif

/* Size of Supported Address Parameter for 'x' address types. */
#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

int sctp_v6_init(void);
void sctp_v6_exit(void);
void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
			int type, int code, int offset, __u32 info);

#else /* #ifdef defined(CONFIG_IPV6) */

static inline int sctp_v6_init(void) { return 0; }
static inline void sctp_v6_exit(void) { return; }

#endif /* #if defined(CONFIG_IPV6) */

/* Some wrappers, in case crypto not available. */
#if defined (CONFIG_CRYPTO_HMAC)
#define sctp_crypto_alloc_tfm crypto_alloc_tfm