usr/src/stand/lib/tcp/tcp_sack.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997, 2002-2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _INET_SACK_H
  28 #define _INET_SACK_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <netinet/tcp.h>        /* for tcp_seq */
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 /* Maximum num of receiver's SACK blocks */
  39 #define MAX_SACK_BLK    5
  40
  41 /* Receiver's SACK blk structure */
  42 typedef struct sack_blk
  43 {
  44         tcp_seq begin;
  45         tcp_seq end;
  46 } sack_blk_t;
  47
  48 /* Sender's notsack'ed blk structure */
  49 typedef struct notsack_blk
  50 {
  51         struct notsack_blk      *next;
  52         tcp_seq                 begin;
  53         tcp_seq                 end;
  54         uint32_t                sack_cnt; /* Dup SACK count */
  55 } notsack_blk_t;
  56
  57
  58 /* SACK information in the tcp_t structure. */
  59 typedef struct
  60 {
  61         int32_t tcp_pipe;       /* # of bytes in network */
  62         tcp_seq tcp_fack;       /* highest sack'ed seq num */
  63         tcp_seq tcp_sack_snxt;  /* next seq num to be rexmited using SACK. */
  64
  65         int32_t tcp_max_sack_blk; /* max # of SACK info blk in a segment */
  66         int32_t tcp_num_sack_blk; /* num of blks in sack list */
  67         sack_blk_t      tcp_sack_list[MAX_SACK_BLK]; /* the sack list */
  68
  69         /* num of blks in notsack list */
  70         int32_t         tcp_num_notsack_blk;
  71         /* # of bytes represented in blks in notsack list */
  72         uint32_t        tcp_cnt_notsack_list;
  73         /* the notsack list */
  74         notsack_blk_t   *tcp_notsack_list;
  75 } tcp_sack_info_t;
  76
  77 extern void tcp_sack_insert(sack_blk_t *, tcp_seq, tcp_seq, int32_t *);
  78 extern void tcp_sack_remove(sack_blk_t *, tcp_seq, int32_t *);
  79 extern void tcp_notsack_insert(notsack_blk_t **, tcp_seq, tcp_seq,
  80     int32_t *, uint32_t *);
  81 extern void tcp_notsack_remove(notsack_blk_t **, tcp_seq, int32_t *,
  82     uint32_t *);
  83 extern void tcp_notsack_update(notsack_blk_t **, tcp_seq, tcp_seq,
  84     int32_t *, uint32_t *);
  85
  86
  87 /*
  88  * Macro to remove all the notsack'ed blks in sender.
  89  *
  90  * Param:
  91  * notsack_blk_t *head: pointer to the head of the list of notsack'ed blks.
  92  */
  93 #define TCP_NOTSACK_REMOVE_ALL(head) \
  94 { \
  95         notsack_blk_t *prev, *tmp; \
  96         tmp = (head); \
  97         do { \
  98                 prev = tmp; \
  99                 tmp = tmp->next; \
 100                 bkmem_free((caddr_t)prev, sizeof (notsack_blk_t)); \
 101         } while (tmp != NULL); \
 102         (head) = NULL; \
 103 }
 104
 105 #ifdef  __cplusplus
 106 }
 107 #endif
 108
 109 #endif  /* _INET_SACK_H */