2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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)
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
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 */
50 #define MBUF_CTOP(bp) \
51 ((bp) ? (u_char *)((bp)+1) + (bp)->m_offset : (u_char *)bp)
53 #define CONST_MBUF_CTOP(bp) \
54 ((bp) ? (const u_char *)((bp)+1) + (bp)->m_offset : (const u_char *)bp)
66 #define MB_ICOMPDIN 10
67 #define MB_ICOMPDOUT 11
69 #define MB_COMPDOUT 13
75 #define MB_PROTOOUT 19
83 #define MB_ASYNCOUT 27
94 #define MB_IPV6CPIN 38
95 #define MB_IPV6CPOUT 39
99 #define MB_MAX MB_UNKNOWN
101 #define M_MAXLEN (4352 - sizeof(struct mbuf)) /* > HDLCSIZE */
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);
118 extern int mbuf_Show(struct cmdargs const *);
120 extern void m_enqueue(struct mqueue *, struct mbuf *);
121 extern struct mbuf *m_dequeue(struct mqueue *);