mbuf.h revision 81634 
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: head/usr.sbin/ppp/mbuf.h 81634 2001-08-14 16:05:52Z brian $
29 */
30
31struct mbuf {
32  size_t m_size;		/* size allocated (excluding header) */
33  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
41struct 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 : NULL)
49
50#define CONST_MBUF_CTOP(bp) \
51	((bp) ? (const u_char *)((bp)+1) + (bp)->m_offset : NULL)
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
100struct cmdargs;
101
102extern int m_length(struct mbuf *);
103extern struct mbuf *m_get(size_t, int);
104extern struct mbuf *m_free(struct mbuf *);
105extern void m_freem(struct mbuf *);
106extern void mbuf_Write(struct mbuf *, const void *, size_t);
107extern struct mbuf *mbuf_Read(struct mbuf *, void *, size_t);
108extern size_t mbuf_View(struct mbuf *, void *, size_t);
109extern struct mbuf *m_prepend(struct mbuf *, const void *, size_t, size_t);
110extern struct mbuf *m_adj(struct mbuf *, ssize_t);
111extern struct mbuf *m_pullup(struct mbuf *);
112extern void m_settype(struct mbuf *, int);
113extern struct mbuf *m_append(struct mbuf *, const void *, size_t);
114
115extern int mbuf_Show(struct cmdargs const *);
116
117extern void m_enqueue(struct mqueue *, struct mbuf *);
118extern struct mbuf *m_dequeue(struct mqueue *);
119