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 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 unsigned long priv; /* private data - holds HDLC escape count */ 39 /* buffer space is malloc()d directly after the header */ 40 }; 41 42 struct mqueue { 43 struct mbuf *top; 44 struct mbuf *last; 45 size_t len; 46 }; 47 48 #define MBUF_CTOP(bp) \ 49 ((bp) ? (u_char *)((bp)+1) + (bp)->m_offset : (u_char *)bp) 50 51 #define CONST_MBUF_CTOP(bp) \ 52 ((bp) ? (const u_char *)((bp)+1) + (bp)->m_offset : (const u_char *)bp) 53 54 #define MB_IPIN 0 55 #define MB_IPOUT 1 56 #define MB_IPV6IN 2 57 #define MB_IPV6OUT 3 58 #define MB_NATIN 4 59 #define MB_NATOUT 5 60 #define MB_MPIN 6 61 #define MB_MPOUT 7 62 #define MB_VJIN 8 63 #define MB_VJOUT 9 64 #define MB_ICOMPDIN 10 65 #define MB_ICOMPDOUT 11 66 #define MB_COMPDIN 12 67 #define MB_COMPDOUT 13 68 #define MB_LQRIN 14 69 #define MB_LQROUT 15 70 #define MB_ECHOIN 16 71 #define MB_ECHOOUT 17 72 #define MB_PROTOIN 18 73 #define MB_PROTOOUT 19 74 #define MB_ACFIN 20 75 #define MB_ACFOUT 21 76 #define MB_SYNCIN 22 77 #define MB_SYNCOUT 23 78 #define MB_HDLCIN 24 79 #define MB_HDLCOUT 25 80 #define MB_ASYNCIN 26 81 #define MB_ASYNCOUT 27 82 #define MB_CBCPIN 28 83 #define MB_CBCPOUT 29 84 #define MB_CHAPIN 30 85 #define MB_CHAPOUT 31 86 #define MB_PAPIN 32 87 #define MB_PAPOUT 33 88 #define MB_CCPIN 34 89 #define MB_CCPOUT 35 90 #define MB_IPCPIN 36 91 #define MB_IPCPOUT 37 92 #define MB_IPV6CPIN 38 93 #define MB_IPV6CPOUT 39 94 #define MB_LCPIN 40 95 #define MB_LCPOUT 41 96 #define MB_UNKNOWN 42 97 #define MB_MAX MB_UNKNOWN 98 99 #define M_MAXLEN (4352 - sizeof(struct mbuf)) /* > HDLCSIZE */ 100 101 struct cmdargs; 102 103 extern size_t m_length(struct mbuf *); 104 extern struct mbuf *m_get(size_t, int); 105 extern struct mbuf *m_free(struct mbuf *); 106 extern void m_freem(struct mbuf *); 107 extern void mbuf_Write(struct mbuf *, const void *, size_t); 108 extern struct mbuf *mbuf_Read(struct mbuf *, void *, size_t); 109 extern size_t mbuf_View(struct mbuf *, void *, size_t); 110 extern struct mbuf *m_prepend(struct mbuf *, const void *, size_t, u_short); 111 extern struct mbuf *m_adj(struct mbuf *, ssize_t); 112 extern struct mbuf *m_pullup(struct mbuf *); 113 extern void m_settype(struct mbuf *, int); 114 extern struct mbuf *m_append(struct mbuf *, const void *, size_t); 115 116 extern int mbuf_Show(struct cmdargs const *); 117 118 extern void m_enqueue(struct mqueue *, struct mbuf *); 119 extern struct mbuf *m_dequeue(struct mqueue *); 120