1 /* 2 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 3 * 4 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 5 * 6 * Redistribution and use in source and binary forms are permitted 7 * provided that the above copyright notice and this paragraph are 8 * duplicated in all such forms and that any documentation, 9 * advertising materials, and other materials related to such 10 * distribution and use acknowledge that the software was developed 11 * by the Internet Initiative Japan. The name of the 12 * IIJ may not be used to endorse or promote products derived 13 * from this software without specific prior written permission. 14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 17 * 18 * $Id:$ 19 * 20 * TODO: 21 */ 22 23 #ifndef _MBUF_H_ 24 #define _MBUF_H_ 25 26 struct mbuf { 27 u_char *base; /* pointer to top of buffer space */ 28 short size; /* size allocated from base */ 29 short offset; /* offset to start position */ 30 short cnt; /* available byte count in buffer */ 31 short type; 32 struct mbuf *next; /* link to next mbuf */ 33 struct mbuf *pnext; /* link to next packet */ 34 }; 35 36 struct mqueue { 37 struct mbuf *top; 38 struct mbuf *last; 39 int qlen; 40 }; 41 42 #define NULLBUFF ((struct mbuf *)0) 43 44 #define MBUF_CTOP(bp) (bp->base + bp->offset) 45 46 #define MB_ASYNC 1 47 #define MB_FSM 2 48 #define MB_HDLCOUT 3 49 #define MB_IPIN 4 50 #define MB_ECHO 5 51 #define MB_LQR 6 52 #define MB_MODEM 7 53 #define MB_VJCOMP 8 54 #define MB_LOG 9 55 #define MB_IPQ 10 56 #define MB_MAX MB_IPQ 57 58 extern int plength __P((struct mbuf *bp)); 59 extern struct mbuf *mballoc __P((int cnt, int type)); 60 extern struct mbuf *mbfree __P((struct mbuf *bp)); 61 extern void pfree __P((struct mbuf *bp)); 62 extern void mbwrite __P((struct mbuf *bp, u_char *ptr, int cnt)); 63 extern struct mbuf *mbread __P((struct mbuf *bp, u_char *ptr, int cnt)); 64 extern void DumpBp __P((struct mbuf *bp)); 65 extern void Enqueue __P((struct mqueue *queue, struct mbuf *bp)); 66 extern struct mbuf *Dequeue __P((struct mqueue *queue)); 67 #endif 68