You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
207 lines
6.4 KiB
207 lines
6.4 KiB
/* 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 Intel Corp.
|
|
*
|
|
* This file is part of the SCTP kernel reference Implementation
|
|
*
|
|
* These are the definitions needed for the tsnmap type. The tsnmap is used
|
|
* to track out of order TSNs received.
|
|
*
|
|
* 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 <lksctp-developers@lists.sourceforge.net>
|
|
*
|
|
* Or submit a bug report through the following website:
|
|
* http://www.sf.net/projects/lksctp
|
|
*
|
|
* Written or modified by:
|
|
* Jon Grimm <jgrimm@us.ibm.com>
|
|
* La Monte H.P. Yarroll <piggy@acm.org>
|
|
* Karl Knutson <karl@athena.chicago.il.us>
|
|
* Sridhar Samudrala <sri@us.ibm.com>
|
|
*
|
|
* Any bugs reported given to us we will try to fix... any fixes shared will
|
|
* be incorporated into the next SCTP release.
|
|
*/
|
|
#include <net/sctp/constants.h>
|
|
|
|
#ifndef __sctp_tsnmap_h__
|
|
#define __sctp_tsnmap_h__
|
|
|
|
/* RFC 2960 12.2 Parameters necessary per association (i.e. the TCB)
|
|
* Mapping An array of bits or bytes indicating which out of
|
|
* Array order TSN's have been received (relative to the
|
|
* Last Rcvd TSN). If no gaps exist, i.e. no out of
|
|
* order packets have been received, this array
|
|
* will be set to all zero. This structure may be
|
|
* in the form of a circular buffer or bit array.
|
|
*/
|
|
struct sctp_tsnmap {
|
|
/* This array counts the number of chunks with each TSN.
|
|
* It points at one of the two buffers with which we will
|
|
* ping-pong between.
|
|
*/
|
|
__u8 *tsn_map;
|
|
|
|
/* This marks the tsn which overflows the tsn_map, when the
|
|
* cumulative ack point reaches this point we know we can switch
|
|
* maps (tsn_map and overflow_map swap).
|
|
*/
|
|
__u32 overflow_tsn;
|
|
|
|
/* This is the overflow array for tsn_map.
|
|
* It points at one of the other ping-pong buffers.
|
|
*/
|
|
__u8 *overflow_map;
|
|
|
|
/* This is the TSN at tsn_map[0]. */
|
|
__u32 base_tsn;
|
|
|
|
/* Last Rcvd : This is the last TSN received in
|
|
* TSN : sequence. This value is set initially by
|
|
* : taking the peer's Initial TSN, received in
|
|
* : the INIT or INIT ACK chunk, and subtracting
|
|
* : one from it.
|
|
*
|
|
* Throughout most of the specification this is called the
|
|
* "Cumulative TSN ACK Point". In this case, we
|
|
* ignore the advice in 12.2 in favour of the term
|
|
* used in the bulk of the text.
|
|
*/
|
|
__u32 cumulative_tsn_ack_point;
|
|
|
|
/* This is the minimum number of TSNs we can track. This corresponds
|
|
* to the size of tsn_map. Note: the overflow_map allows us to
|
|
* potentially track more than this quantity.
|
|
*/
|
|
__u16 len;
|
|
|
|
/* This is the highest TSN we've marked. */
|
|
__u32 max_tsn_seen;
|
|
|
|
/* Data chunks pending receipt. used by SCTP_STATUS sockopt */
|
|
__u16 pending_data;
|
|
|
|
/* Record duplicate TSNs here. We clear this after
|
|
* every SACK. Store up to SCTP_MAX_DUP_TSNS worth of
|
|
* information.
|
|
*/
|
|
__be32 dup_tsns[SCTP_MAX_DUP_TSNS];
|
|
__u16 num_dup_tsns;
|
|
|
|
/* Record gap ack block information here. */
|
|
struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
|
|
|
|
int malloced;
|
|
|
|
__u8 raw_map[0];
|
|
};
|
|
|
|
struct sctp_tsnmap_iter {
|
|
__u32 start;
|
|
};
|
|
|
|
/* This macro assists in creation of external storage for variable length
|
|
* internal buffers. We double allocate so the overflow map works.
|
|
*/
|
|
#define sctp_tsnmap_storage_size(count) (sizeof(__u8) * (count) * 2)
|
|
|
|
/* Initialize a block of memory as a tsnmap. */
|
|
struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *, __u16 len,
|
|
__u32 initial_tsn);
|
|
|
|
/* Test the tracking state of this TSN.
|
|
* Returns:
|
|
* 0 if the TSN has not yet been seen
|
|
* >0 if the TSN has been seen (duplicate)
|
|
* <0 if the TSN is invalid (too large to track)
|
|
*/
|
|
int sctp_tsnmap_check(const struct sctp_tsnmap *, __u32 tsn);
|
|
|
|
/* Mark this TSN as seen. */
|
|
void sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn);
|
|
|
|
/* Mark this TSN and all lower as seen. */
|
|
void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn);
|
|
|
|
/* Retrieve the Cumulative TSN ACK Point. */
|
|
static inline __u32 sctp_tsnmap_get_ctsn(const struct sctp_tsnmap *map)
|
|
{
|
|
return map->cumulative_tsn_ack_point;
|
|
}
|
|
|
|
/* Retrieve the highest TSN we've seen. */
|
|
static inline __u32 sctp_tsnmap_get_max_tsn_seen(const struct sctp_tsnmap *map)
|
|
{
|
|
return map->max_tsn_seen;
|
|
}
|
|
|
|
/* How many duplicate TSNs are stored? */
|
|
static inline __u16 sctp_tsnmap_num_dups(struct sctp_tsnmap *map)
|
|
{
|
|
return map->num_dup_tsns;
|
|
}
|
|
|
|
/* Return pointer to duplicate tsn array as needed by SACK. */
|
|
static inline __be32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map)
|
|
{
|
|
map->num_dup_tsns = 0;
|
|
return map->dup_tsns;
|
|
}
|
|
|
|
/* How many gap ack blocks do we have recorded? */
|
|
__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map);
|
|
|
|
/* Refresh the count on pending data. */
|
|
__u16 sctp_tsnmap_pending(struct sctp_tsnmap *map);
|
|
|
|
/* Return pointer to gap ack blocks as needed by SACK. */
|
|
static inline struct sctp_gap_ack_block *sctp_tsnmap_get_gabs(struct sctp_tsnmap *map)
|
|
{
|
|
return map->gabs;
|
|
}
|
|
|
|
/* Is there a gap in the TSN map? */
|
|
static inline int sctp_tsnmap_has_gap(const struct sctp_tsnmap *map)
|
|
{
|
|
int has_gap;
|
|
|
|
has_gap = (map->cumulative_tsn_ack_point != map->max_tsn_seen);
|
|
return has_gap;
|
|
}
|
|
|
|
/* Mark a duplicate TSN. Note: limit the storage of duplicate TSN
|
|
* information.
|
|
*/
|
|
static inline void sctp_tsnmap_mark_dup(struct sctp_tsnmap *map, __u32 tsn)
|
|
{
|
|
if (map->num_dup_tsns < SCTP_MAX_DUP_TSNS)
|
|
map->dup_tsns[map->num_dup_tsns++] = htonl(tsn);
|
|
}
|
|
|
|
/* Renege a TSN that was seen. */
|
|
void sctp_tsnmap_renege(struct sctp_tsnmap *, __u32 tsn);
|
|
|
|
/* Is there a gap in the TSN map? */
|
|
int sctp_tsnmap_has_gap(const struct sctp_tsnmap *);
|
|
|
|
#endif /* __sctp_tsnmap_h__ */
|
|
|