1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 5 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 6 * Internet Initiative Japan, Inc (IIJ) 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 struct mbuf { 34 size_t m_size; /* size allocated (excluding header) */ 35 u_short m_offset; /* offset from header end to start position */ 36 size_t m_len; /* available byte count in buffer */ 37 short m_type; /* MB_* below */ 38 struct mbuf *m_next; /* link to next mbuf */ 39 struct mbuf *m_nextpkt; /* link to next packet */ 40 unsigned long priv; /* private data - holds HDLC escape count */ 41 /* buffer space is malloc()d directly after the header */ 42 }; 43 44 struct mqueue { 45 struct mbuf *top; 46 struct mbuf *last; 47 size_t len; 48 }; 49 50 #define MBUF_CTOP(bp) \ 51 ((bp) ? (u_char *)((bp)+1) + (bp)->m_offset : (u_char *)bp) 52 53 #define CONST_MBUF_CTOP(bp) \ 54 ((bp) ? (const u_char *)((bp)+1) + (bp)->m_offset : (const u_char *)bp) 55 56 #define MB_IPIN 0 57 #define MB_IPOUT 1 58 #define MB_IPV6IN 2 59 #define MB_IPV6OUT 3 60 #define MB_NATIN 4 61 #define MB_NATOUT 5 62 #define MB_MPIN 6 63 #define MB_MPOUT 7 64 #define MB_VJIN 8 65 #define MB_VJOUT 9 66 #define MB_ICOMPDIN 10 67 #define MB_ICOMPDOUT 11 68 #define MB_COMPDIN 12 69 #define MB_COMPDOUT 13 70 #define MB_LQRIN 14 71 #define MB_LQROUT 15 72 #define MB_ECHOIN 16 73 #define MB_ECHOOUT 17 74 #define MB_PROTOIN 18 75 #define MB_PROTOOUT 19 76 #define MB_ACFIN 20 77 #define MB_ACFOUT 21 78 #define MB_SYNCIN 22 79 #define MB_SYNCOUT 23 80 #define MB_HDLCIN 24 81 #define MB_HDLCOUT 25 82 #define MB_ASYNCIN 26 83 #define MB_ASYNCOUT 27 84 #define MB_CBCPIN 28 85 #define MB_CBCPOUT 29 86 #define MB_CHAPIN 30 87 #define MB_CHAPOUT 31 88 #define MB_PAPIN 32 89 #define MB_PAPOUT 33 90 #define MB_CCPIN 34 91 #define MB_CCPOUT 35 92 #define MB_IPCPIN 36 93 #define MB_IPCPOUT 37 94 #define MB_IPV6CPIN 38 95 #define MB_IPV6CPOUT 39 96 #define MB_LCPIN 40 97 #define MB_LCPOUT 41 98 #define MB_UNKNOWN 42 99 #define MB_MAX MB_UNKNOWN 100 101 #define M_MAXLEN (4352 - sizeof(struct mbuf)) /* > HDLCSIZE */ 102 103 struct cmdargs; 104 105 extern size_t m_length(struct mbuf *); 106 extern struct mbuf *m_get(size_t, int); 107 extern struct mbuf *m_free(struct mbuf *); 108 extern void m_freem(struct mbuf *); 109 extern void mbuf_Write(struct mbuf *, const void *, size_t); 110 extern struct mbuf *mbuf_Read(struct mbuf *, void *, size_t); 111 extern size_t mbuf_View(struct mbuf *, void *, size_t); 112 extern struct mbuf *m_prepend(struct mbuf *, const void *, size_t, u_short); 113 extern struct mbuf *m_adj(struct mbuf *, ssize_t); 114 extern struct mbuf *m_pullup(struct mbuf *); 115 extern void m_settype(struct mbuf *, int); 116 extern struct mbuf *m_append(struct mbuf *, const void *, size_t); 117 118 extern int mbuf_Show(struct cmdargs const *); 119 120 extern void m_enqueue(struct mqueue *, struct mbuf *); 121 extern struct mbuf *m_dequeue(struct mqueue *); 122