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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)socketvar.h      8.3 (Berkeley) 2/19/95
  30  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
  31  * $DragonFly: src/sys/sys/sockbuf.h,v 1.1 2007/04/22 01:13:17 dillon Exp $
  32  */
  33
  34 #ifndef _SYS_SOCKBUF_H_
  35 #define _SYS_SOCKBUF_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40
  41 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  42
  43 /*
  44  * Generic socket buffer for keeping track of mbuf chains.  These
  45  * are used primarily to manipulate mbuf chains in standalone pieces
  46  * of code.
  47  */
  48 struct sockbuf {
  49         u_long  sb_cc;          /* actual chars in buffer */
  50         u_long  sb_mbcnt;       /* chars of mbufs used */
  51         u_long  sb_cc_prealloc;
  52         u_long  sb_mbcnt_prealloc;
  53         u_long  sb_climit;      /* data limit when used for I/O */
  54         struct  mbuf *sb_mb;    /* the mbuf chain */
  55         struct  mbuf *sb_lastmbuf;      /* last mbuf in sb_mb */
  56         struct  mbuf *sb_lastrecord;    /* last record in sb_mb
  57                                          * valid <=> sb_mb non-NULL */
  58 };
  59
  60 #define SB_MAX          (512*1024)      /* default for max chars in sockbuf */
  61
  62 #endif
  63
  64 #ifdef _KERNEL
  65
  66 #include <machine/atomic.h>
  67 #ifndef _SYS_MBUF_H_
  68 #include <sys/mbuf.h>
  69 #endif
  70
  71 /*
  72  * Macros for sockets and socket buffering.
  73  */
  74
  75 #ifdef SOCKBUF_DEBUG
  76 #define sbcheck(sb)     _sbcheck(sb)
  77 #else
  78 #define sbcheck(sb)
  79 #endif
  80
  81 /* adjust counters in sb reflecting allocation of m */
  82 #define sballoc(sb, m) { \
  83         (sb)->sb_cc += (m)->m_len; \
  84         (sb)->sb_mbcnt += MSIZE; \
  85         if ((m)->m_flags & M_EXT) \
  86                 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
  87 }
  88
  89 /* adjust counters in sb reflecting allocation of m */
  90 #define sbprealloc(sb, m) { \
  91         u_long __mbcnt_sz; \
  92  \
  93         atomic_add_long(&((sb)->sb_cc_prealloc), (m)->m_len); \
  94  \
  95         __mbcnt_sz = MSIZE; \
  96         if ((m)->m_flags & M_EXT) \
  97                 __mbcnt_sz += (m)->m_ext.ext_size; \
  98         atomic_add_long(&((sb)->sb_mbcnt_prealloc), __mbcnt_sz); \
  99 }
 100
 101 /* adjust counters in sb reflecting freeing of m */
 102 #define sbfree(sb, m) { \
 103         u_long __mbcnt_sz; \
 104  \
 105         (sb)->sb_cc -= (m)->m_len; \
 106         atomic_subtract_long(&((sb)->sb_cc_prealloc), (m)->m_len); \
 107  \
 108         __mbcnt_sz = MSIZE; \
 109         if ((m)->m_flags & M_EXT) \
 110                 __mbcnt_sz += (m)->m_ext.ext_size; \
 111         (sb)->sb_mbcnt -= __mbcnt_sz; \
 112         atomic_subtract_long(&((sb)->sb_mbcnt_prealloc), __mbcnt_sz); \
 113 }
 114
 115 static __inline void
 116 sbinit(struct sockbuf *sb, u_long climit)
 117 {
 118         sb->sb_cc = 0;
 119         sb->sb_mbcnt = 0;
 120         sb->sb_cc_prealloc = 0;
 121         sb->sb_mbcnt_prealloc = 0;
 122         sb->sb_climit = climit;
 123         sb->sb_mb = NULL;
 124         sb->sb_lastmbuf = NULL;
 125         sb->sb_lastrecord = NULL;
 126 }
 127
 128 void    sbappend (struct sockbuf *sb, struct mbuf *m);
 129 int     sbappendaddr (struct sockbuf *sb, const struct sockaddr *asa,
 130             struct mbuf *m0, struct mbuf *control);
 131 int     sbappendcontrol (struct sockbuf *sb, struct mbuf *m0,
 132             struct mbuf *control);
 133 void    sbappendrecord (struct sockbuf *sb, struct mbuf *m0);
 134 void    sbappendstream (struct sockbuf *sb, struct mbuf *m);
 135 void    _sbcheck (struct sockbuf *sb);
 136 void    sbcompress (struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
 137 struct mbuf *
 138         sbcreatecontrol (caddr_t p, int size, int type, int level);
 139 void    sbdrop (struct sockbuf *sb, int len);
 140 void    sbdroprecord (struct sockbuf *sb);
 141 struct mbuf *
 142         sbunlinkmbuf (struct sockbuf *, struct mbuf *, struct mbuf **);
 143 void    sbflush (struct sockbuf *sb);
 144
 145 #endif /* _KERNEL */
 146
 147 #endif /* !_SYS_SOCKBUF_H_ */