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_ */ 125