1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/mbuf.h,v 1.24.2.3 2002/09/01 02:12:28 brian Exp $ 29 */ 30 31 struct mbuf { 32 size_t m_size; /* size allocated (excluding header) */ 33 u_short m_offset; /* offset from header end to start position */ 34 size_t m_len; /* available byte count in buffer */ 35 short m_type; /* MB_* below */ 36 struct mbuf *m_next; /* link to next mbuf */ 37 struct mbuf *m_nextpkt; /* link to next packet */ 38 /* buffer space is malloc()d directly after the header */ 39 }; 40 41 struct mqueue { 42 struct mbuf *top; 43 struct mbuf *last; 44 size_t len; 45 }; 46 47 #define MBUF_CTOP(bp) \ 48 ((bp) ? (u_char *)((bp)+1) + (bp)->m_offset : (u_char *)bp) 49 50 #define CONST_MBUF_CTOP(bp) \ 51 ((bp) ? (const u_char *)((bp)+1) + (bp)->m_offset : (const u_char *)bp) 52 53 #define MB_IPIN 0 54 #define MB_IPOUT 1 55 #define MB_IPV6IN 2 56 #define MB_IPV6OUT 3 57 #define MB_NATIN 4 58 #define MB_NATOUT 5 59 #define MB_MPIN 6 60 #define MB_MPOUT 7 61 #define MB_VJIN 8 62 #define MB_VJOUT 9 63 #define MB_ICOMPDIN 10 64 #define MB_ICOMPDOUT 11 65 #define MB_COMPDIN 12 66 #define MB_COMPDOUT 13 67 #define MB_LQRIN 14 68 #define MB_LQROUT 15 69 #define MB_ECHOIN 16 70 #define MB_ECHOOUT 17 71 #define MB_PROTOIN 18 72 #define MB_PROTOOUT 19 73 #define MB_ACFIN 20 74 #define MB_ACFOUT 21 75 #define MB_SYNCIN 22 76 #define MB_SYNCOUT 23 77 #define MB_HDLCIN 24 78 #define MB_HDLCOUT 25 79 #define MB_ASYNCIN 26 80 #define MB_ASYNCOUT 27 81 #define MB_CBCPIN 28 82 #define MB_CBCPOUT 29 83 #define MB_CHAPIN 30 84 #define MB_CHAPOUT 31 85 #define MB_PAPIN 32 86 #define MB_PAPOUT 33 87 #define MB_CCPIN 34 88 #define MB_CCPOUT 35 89 #define MB_IPCPIN 36 90 #define MB_IPCPOUT 37 91 #define MB_IPV6CPIN 38 92 #define MB_IPV6CPOUT 39 93 #define MB_LCPIN 40 94 #define MB_LCPOUT 41 95 #define MB_UNKNOWN 42 96 #define MB_MAX MB_UNKNOWN 97 98 #define M_MAXLEN (4352 - sizeof(struct mbuf)) /* > HDLCSIZE */ 99 100 struct cmdargs; 101 102 extern size_t m_length(struct mbuf *); 103 extern struct mbuf *m_get(size_t, int); 104 extern struct mbuf *m_free(struct mbuf *); 105 extern void m_freem(struct mbuf *); 106 extern void mbuf_Write(struct mbuf *, const void *, size_t); 107 extern struct mbuf *mbuf_Read(struct mbuf *, void *, size_t); 108 extern size_t mbuf_View(struct mbuf *, void *, size_t); 109 extern struct mbuf *m_prepend(struct mbuf *, const void *, size_t, u_short); 110 extern struct mbuf *m_adj(struct mbuf *, ssize_t); 111 extern struct mbuf *m_pullup(struct mbuf *); 112 extern void m_settype(struct mbuf *, int); 113 extern struct mbuf *m_append(struct mbuf *, const void *, size_t); 114 115 extern int mbuf_Show(struct cmdargs const *); 116 117 extern void m_enqueue(struct mqueue *, struct mbuf *); 118 extern struct mbuf *m_dequeue(struct mqueue *); 119