/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997, 2002-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _INET_SACK_H
#define _INET_SACK_H

#pragma ident   "%Z%%M% %I%     %E% SMI"

#include <netinet/tcp.h>        /* for tcp_seq */

#ifdef  __cplusplus
extern "C" {
#endif

/* Maximum num of receiver's SACK blocks */
#define MAX_SACK_BLK    5

/* Receiver's SACK blk structure */
typedef struct sack_blk
{
        tcp_seq begin;
        tcp_seq end;
} sack_blk_t;

/* Sender's notsack'ed blk structure */
typedef struct notsack_blk
{
        struct notsack_blk      *next;
        tcp_seq                 begin;
        tcp_seq                 end;
        uint32_t                sack_cnt; /* Dup SACK count */
} notsack_blk_t;


/* SACK information in the tcp_t structure. */
typedef struct
{
        int32_t tcp_pipe;       /* # of bytes in network */
        tcp_seq tcp_fack;       /* highest sack'ed seq num */
        tcp_seq tcp_sack_snxt;  /* next seq num to be rexmited using SACK. */

        int32_t tcp_max_sack_blk; /* max # of SACK info blk in a segment */
        int32_t tcp_num_sack_blk; /* num of blks in sack list */
        sack_blk_t      tcp_sack_list[MAX_SACK_BLK]; /* the sack list */

        /* num of blks in notsack list */
        int32_t         tcp_num_notsack_blk;
        /* # of bytes represented in blks in notsack list */
        uint32_t        tcp_cnt_notsack_list;
        /* the notsack list */
        notsack_blk_t   *tcp_notsack_list;
} tcp_sack_info_t;

extern void tcp_sack_insert(sack_blk_t *, tcp_seq, tcp_seq, int32_t *);
extern void tcp_sack_remove(sack_blk_t *, tcp_seq, int32_t *);
extern void tcp_notsack_insert(notsack_blk_t **, tcp_seq, tcp_seq,
    int32_t *, uint32_t *);
extern void tcp_notsack_remove(notsack_blk_t **, tcp_seq, int32_t *,
    uint32_t *);
extern void tcp_notsack_update(notsack_blk_t **, tcp_seq, tcp_seq,
    int32_t *, uint32_t *);


/*
 * Macro to remove all the notsack'ed blks in sender.
 *
 * Param:
 * notsack_blk_t *head: pointer to the head of the list of notsack'ed blks.
 */
#define TCP_NOTSACK_REMOVE_ALL(head) \
{ \
        notsack_blk_t *prev, *tmp; \
        tmp = (head); \
        do { \
                prev = tmp; \
                tmp = tmp->next; \
                bkmem_free((caddr_t)prev, sizeof (notsack_blk_t)); \
        } while (tmp != NULL); \
        (head) = NULL; \
}

#ifdef  __cplusplus
}
#endif

#endif  /* _INET_SACK_H */