sys/sys/sockbuf.h

   1 /*-
   2  * Copyright (c) 1982, 1986, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)socketvar.h      8.3 (Berkeley) 2/19/95
  34  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
  35  * $DragonFly: src/sys/sys/sockbuf.h,v 1.1 2007/04/22 01:13:17 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_SOCKBUF_H_
  39 #define _SYS_SOCKBUF_H_
  40
  41 #ifndef _SYS_TYPES_H_
  42 #include <sys/types.h>
  43 #endif
  44
  45 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  46
  47 /*
  48  * Generic socket buffer for keeping track of mbuf chains.  These
  49  * are used primarily to manipulate mbuf chains in standalone pieces
  50  * of code.
  51  */
  52 struct sockbuf {
  53         u_long  sb_cc;          /* actual chars in buffer */
  54         u_long  sb_mbcnt;       /* chars of mbufs used */
  55         u_long  sb_climit;      /* data limit when used for I/O */
  56         struct  mbuf *sb_mb;    /* the mbuf chain */
  57         struct  mbuf *sb_lastmbuf;      /* last mbuf in sb_mb */
  58         struct  mbuf *sb_lastrecord;    /* last record in sb_mb
  59                                          * valid <=> sb_mb non-NULL */
  60 };
  61
  62 #define SB_MAX          (256*1024)      /* default for max chars in sockbuf */
  63
  64 #endif
  65
  66 #ifdef _KERNEL
  67
  68 /*
  69  * Macros for sockets and socket buffering.
  70  */
  71
  72 #ifdef SOCKBUF_DEBUG
  73 #define sbcheck(sb)     _sbcheck(sb)
  74 #else
  75 #define sbcheck(sb)
  76 #endif
  77
  78 /* adjust counters in sb reflecting allocation of m */
  79 #define sballoc(sb, m) { \
  80         (sb)->sb_cc += (m)->m_len; \
  81         (sb)->sb_mbcnt += MSIZE; \
  82         if ((m)->m_flags & M_EXT) \
  83                 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
  84 }
  85
  86 /* adjust counters in sb reflecting freeing of m */
  87 #define sbfree(sb, m) { \
  88         (sb)->sb_cc -= (m)->m_len; \
  89         (sb)->sb_mbcnt -= MSIZE; \
  90         if ((m)->m_flags & M_EXT) \
  91                 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
  92 }
  93
  94 static __inline void
  95 sbinit(struct sockbuf *sb, u_long climit)
  96 {
  97         sb->sb_cc = 0;
  98         sb->sb_mbcnt = 0;
  99         sb->sb_climit = climit;
 100         sb->sb_mb = NULL;
 101         sb->sb_lastmbuf = NULL;
 102         sb->sb_lastrecord = NULL;
 103 }
 104
 105 void    sbappend (struct sockbuf *sb, struct mbuf *m);
 106 int     sbappendaddr (struct sockbuf *sb, const struct sockaddr *asa,
 107             struct mbuf *m0, struct mbuf *control);
 108 int     sbappendcontrol (struct sockbuf *sb, struct mbuf *m0,
 109             struct mbuf *control);
 110 void    sbappendrecord (struct sockbuf *sb, struct mbuf *m0);
 111 void    sbappendstream (struct sockbuf *sb, struct mbuf *m);
 112 void    _sbcheck (struct sockbuf *sb);
 113 void    sbcompress (struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
 114 struct mbuf *
 115         sbcreatecontrol (caddr_t p, int size, int type, int level);
 116 void    sbdrop (struct sockbuf *sb, int len);
 117 void    sbdroprecord (struct sockbuf *sb);
 118 struct mbuf *
 119         sbunlinkmbuf (struct sockbuf *, struct mbuf *, struct mbuf **);
 120 void    sbflush (struct sockbuf *sb);
 121
 122 #endif /* _KERNEL */
 123
 124 #endif /* !_SYS_SOCKBUF_H_ */