structs.h

linux-2.4.29操作系统的源码

/* SCTP kernel reference Implementation
 * (C) Copyright IBM Corp. 2001, 2003
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001 Intel Corp.
 *
 * This file is part of the SCTP kernel reference Implementation
 *
 * 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 addresses:
 *    lksctp developers <[e-mail]>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    Randall Stewart	    <[e-mail]>
 *    Ken Morneau	    <[e-mail]>
 *    Qiaobing Xie	    <[e-mail]>
 *    La Monte H.P. Yarroll <[e-mail]>
 *    Karl Knutson	    <[e-mail]>
 *    Jon Grimm		    <[e-mail]>
 *    Xingang Guo	    <[e-mail]>
 *    Hui Huang		    <[e-mail]>
 *    Sridhar Samudrala	    <[e-mail]>
 *    Daisy Chang	    <[e-mail]>
 *    Dajiang Zhang	    <[e-mail]>
 *    Ardelle Fan	    <[e-mail]>
 *    Ryan Layer	    <[e-mail]>
 *    Anup Pemmaiah	    <[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 __sctp_structs_h__
#define __sctp_structs_h__

#include <linux/time.h>		/* We get struct timespec.    */
#include <linux/socket.h>	/* linux/in.h needs this!!    */
#include <linux/in.h>		/* We get struct sockaddr_in. */
#include <linux/in6.h>		/* We get struct in6_addr     */
#include <asm/param.h>		/* We get MAXHOSTNAMELEN.     */
#include <asm/atomic.h>		/* This gets us atomic counters.  */
#include <linux/skbuff.h>	/* We need sk_buff_head. */
#include <linux/tqueue.h>	/* We need tq_struct.	 */
#include <linux/sctp.h>		/* We need sctp* header structs.  */

/* A convenience structure for handling sockaddr structures.
 * We should wean ourselves off this.
 */
union sctp_addr {
	struct sockaddr_in v4;
	struct sockaddr_in6 v6;
	struct sockaddr sa;
};

/* Forward declarations for data structures. */
struct sctp_globals;
struct sctp_endpoint;
struct sctp_association;
struct sctp_transport;
struct sctp_packet;
struct sctp_chunk;
struct sctp_inq;
struct sctp_outq;
struct sctp_bind_addr;
struct sctp_ulpq;
struct sctp_opt;
struct sctp_ep_common;
struct sctp_ssnmap;


#include <net/sctp/compat.h>
#include <net/sctp/tsnmap.h>
#include <net/sctp/ulpevent.h>
#include <net/sctp/ulpqueue.h>

/* Structures useful for managing bind/connect. */

struct sctp_bind_bucket {
	unsigned short	port;
	unsigned short	fastreuse;
	struct sctp_bind_bucket *next;
	struct sctp_bind_bucket **pprev;
	struct sock	        *sk;
};

struct sctp_bind_hashbucket {
	spinlock_t	lock;
	struct sctp_bind_bucket	*chain;
};

/* Used for hashing all associations.  */
struct sctp_hashbucket {
	rwlock_t	lock;
	struct sctp_ep_common  *chain;
} __attribute__((__aligned__(8)));


/* The SCTP globals structure. */
extern struct sctp_globals {
	/* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values
	 *
	 * The following protocol parameters are RECOMMENDED:
	 *
	 * RTO.Initial		    - 3	 seconds
	 * RTO.Min		    - 1	 second
	 * RTO.Max		   -  60 seconds
	 * RTO.Alpha		    - 1/8  (3 when converted to right shifts.)
	 * RTO.Beta		    - 1/4  (2 when converted to right shifts.)
	 */
	__u32 rto_initial;
	__u32 rto_min;
	__u32 rto_max;

	/* Note: rto_alpha and rto_beta are really defined as inverse
	 * powers of two to facilitate integer operations.
	 */
	int rto_alpha;
	int rto_beta;

	/* Max.Burst		    - 4 */
	int max_burst;

	/* Valid.Cookie.Life	    - 60  seconds  */
	int valid_cookie_life;

	/* Whether Cookie Preservative is enabled(1) or not(0) */
	int cookie_preserve_enable;

	/* Association.Max.Retrans  - 10 attempts
	 * Path.Max.Retrans	    - 5	 attempts (per destination address)
	 * Max.Init.Retransmits	    - 8	 attempts
	 */
	int max_retrans_association;
	int max_retrans_path;
	int max_retrans_init;

	/* HB.interval		    - 30 seconds  */
	int hb_interval;

	/* The following variables are implementation specific.	 */

	/* Default initialization values to be applied to new associations. */
	__u16 max_instreams;
	__u16 max_outstreams;

	/* This is a list of groups of functions for each address
	 * family that we support.
	 */
	struct list_head address_families;

	/* This is the hash of all endpoints. */
	int ep_hashsize;
	struct sctp_hashbucket *ep_hashtable;

	/* This is the hash of all associations. */
	int assoc_hashsize;
	struct sctp_hashbucket *assoc_hashtable;

	/* This is the sctp port control hash.	*/
	int port_hashsize;
	int port_rover;
	spinlock_t port_alloc_lock;  /* Protects port_rover. */
	struct sctp_bind_hashbucket *port_hashtable;

	/* This is the global local address list.
	 * We actively maintain this complete list of interfaces on
	 * the system by catching routing events.
	 *
	 * It is a list of sctp_sockaddr_entry.
	 */
	struct list_head local_addr_list;
	spinlock_t local_addr_lock;
	
	/* Flag to indicate if addip is enabled. */
	int addip_enable;

	/* Flag to indicate if PR-SCTP is enabled. */
	int prsctp_enable;
} sctp_globals;

#define sctp_rto_initial		(sctp_globals.rto_initial)
#define sctp_rto_min			(sctp_globals.rto_min)
#define sctp_rto_max			(sctp_globals.rto_max)
#define sctp_rto_alpha			(sctp_globals.rto_alpha)
#define sctp_rto_beta			(sctp_globals.rto_beta)
#define sctp_max_burst			(sctp_globals.max_burst)
#define sctp_valid_cookie_life		(sctp_globals.valid_cookie_life)
#define sctp_cookie_preserve_enable	(sctp_globals.cookie_preserve_enable)
#define sctp_max_retrans_association	(sctp_globals.max_retrans_association)
#define sctp_max_retrans_path		(sctp_globals.max_retrans_path)
#define sctp_max_retrans_init		(sctp_globals.max_retrans_init)
#define sctp_hb_interval		(sctp_globals.hb_interval)
#define sctp_max_instreams		(sctp_globals.max_instreams)
#define sctp_max_outstreams		(sctp_globals.max_outstreams)
#define sctp_address_families		(sctp_globals.address_families)
#define sctp_ep_hashsize		(sctp_globals.ep_hashsize)
#define sctp_ep_hashtable		(sctp_globals.ep_hashtable)
#define sctp_assoc_hashsize		(sctp_globals.assoc_hashsize)
#define sctp_assoc_hashtable		(sctp_globals.assoc_hashtable)
#define sctp_port_hashsize		(sctp_globals.port_hashsize)
#define sctp_port_rover			(sctp_globals.port_rover)
#define sctp_port_alloc_lock		(sctp_globals.port_alloc_lock)
#define sctp_port_hashtable		(sctp_globals.port_hashtable)
#define sctp_local_addr_list		(sctp_globals.local_addr_list)
#define sctp_local_addr_lock		(sctp_globals.local_addr_lock)
#define sctp_addip_enable		(sctp_globals.addip_enable)
#define sctp_prsctp_enable		(sctp_globals.prsctp_enable)

/* SCTP Socket type: UDP or TCP style. */
typedef enum {
	SCTP_SOCKET_UDP = 0,
	SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
	SCTP_SOCKET_TCP
} sctp_socket_type_t;

/* Per socket SCTP information. */
struct sctp_opt {
	/* What kind of a socket is this? */
	sctp_socket_type_t type;

	/* PF_ family specific functions.  */
	struct sctp_pf *pf;

	/* Access to HMAC transform. */
	struct crypto_tfm *hmac;

	/* What is our base endpointer? */
	struct sctp_endpoint *ep;

	/* Various Socket Options.  */
	__u16 default_stream;
	__u32 default_ppid;
	__u16 default_flags;
	__u32 default_context;
	__u32 default_timetolive;

	struct sctp_initmsg initmsg;
	struct sctp_rtoinfo rtoinfo;
	struct sctp_paddrparams paddrparam;
	struct sctp_event_subscribe subscribe;
	struct sctp_assocparams assocparams;
	int user_frag;
	__u32 autoclose;
	__u8 nodelay;
	__u8 disable_fragments;
	__u8 pd_mode;
	__u8 v4mapped;
	__u32 adaption_ind;

	/* Receive to here while partial delivery is in effect. */
	struct sk_buff_head pd_lobby;
};



/* This is our APPLICATION-SPECIFIC state cookie.
 * THIS IS NOT DICTATED BY THE SPECIFICATION.
 */
/* These are the parts of an association which we send in the cookie.
 * Most of these are straight out of:
 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
 *
 */

struct sctp_cookie {

	/* My	       : Tag expected in every inbound packet and sent
	 * Verification: in the INIT or INIT ACK chunk.
	 * Tag	       :
	 */
	__u32 my_vtag;

	/* Peer's      : Tag expected in every outbound packet except
	 * Verification: in the INIT chunk.
	 * Tag	       :
	 */
	__u32 peer_vtag;

	/* The rest of these are not from the spec, but really need to
	 * be in the cookie.
	 */

	/* My Tie Tag  : Assist in discovering a restarting association. */
	__u32 my_ttag;

	/* Peer's Tie Tag: Assist in discovering a restarting association. */
	__u32 peer_ttag;

	/* When does this cookie expire? */
	struct timeval expiration;

	/* Number of inbound/outbound streams which are set
	 * and negotiated during the INIT process.
	 */
	__u16 sinit_num_ostreams;
	__u16 sinit_max_instreams;

	/* This is the first sequence number I used.  */
	__u32 initial_tsn;

	/* This holds the originating address of the INIT packet.  */
	union sctp_addr peer_addr;

	/* IG Section 2.35.3 
	 * Include the source port of the INIT-ACK
	 */
	__u16		my_port;

	__u8 prsctp_capable;

	/* Padding for future use */
	__u8 padding;  		

	__u32 adaption_ind;	


	/* This is a shim for my peer's INIT packet, followed by
	 * a copy of the raw address list of the association.
	 * The length of the raw address list is saved in the
	 * raw_addr_list_len field, which will be used at the time when
	 * the association TCB is re-constructed from the cookie.
	 */
	__u32 raw_addr_list_len;
	struct sctp_init_chunk peer_init[0];
};


/* The format of our cookie that we send to our peer. */
struct sctp_signed_cookie {
	__u8 signature[SCTP_SECRET_SIZE];
	struct sctp_cookie c;
};

/* This is another convenience type to allocate memory for address
 * params for the maximum size and pass such structures around
 * internally.
 */
union sctp_addr_param {
	struct sctp_ipv4addr_param v4;
	struct sctp_ipv6addr_param v6;
};

/* A convenience type to allow walking through the various
 * parameters and avoid casting all over the place.
 */
union sctp_params {
	void *v;
	struct sctp_paramhdr *p;
	struct sctp_cookie_preserve_param *life;
	struct sctp_hostname_param *dns;
	struct sctp_cookie_param *cookie;
	struct sctp_supported_addrs_param *sat;
	struct sctp_ipv4addr_param *v4;
	struct sctp_ipv6addr_param *v6;
	union sctp_addr_param *addr;
	struct sctp_adaption_ind_param *aind;
};

/* RFC 2960.  Section 3.3.5 Heartbeat.
 *    Heartbeat Information: variable length
 *    The Sender-specific Heartbeat Info field should normally include
 *    information about the sender's current time when this HEARTBEAT
 *    chunk is sent and the destination transport address to which this
 *    HEARTBEAT is sent (see Section 8.3).
 */
typedef struct sctp_sender_hb_info {
	struct sctp_paramhdr param_hdr;
	union sctp_addr daddr;
	unsigned long sent_at;
} __attribute__((packed)) sctp_sender_hb_info_t;

/*
 *  RFC 2960 1.3.2 Sequenced Delivery within Streams
 *
 *  The term "stream" is used in SCTP to refer to a sequence of user
 *  messages that are to be delivered to the upper-layer protocol in
 *  order with respect to other messages within the same stream.  This is
 *  in contrast to its usage in TCP, where it refers to a sequence of
 *  bytes (in this document a byte is assumed to be eight bits).
 *  ...
 *
 *  This is the structure we use to track both our outbound and inbound
 *  SSN, or Stream Sequence Numbers.
 */

struct sctp_stream {
	__u16 *ssn;
	unsigned int len;
};

struct sctp_ssnmap {
	struct sctp_stream in;
	struct sctp_stream out;
	int malloced;
};

struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, int gfp);
void sctp_ssnmap_free(struct sctp_ssnmap *map);
void sctp_ssnmap_clear(struct sctp_ssnmap *map);

/* What is the current SSN number for this stream? */
static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
{
	return stream->ssn[id];
}

/* Return the next SSN number for this stream.	*/
static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
{
	return stream->ssn[id]++;
}

/* Skip over this ssn and all below. */
static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,