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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
51 #include "throughput.h"
54 #include "descriptor.h"
57 #define MODE_HUNT 0x01
61 async_Init(struct async *async)
64 memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);
68 async_Setup(struct async *async)
70 async->mode = MODE_HUNT;
72 async->my_accmap = async->his_accmap = 0xffffffff;
76 async_SetLinkParams(struct async *async, u_int32_t mymap, u_int32_t hismap)
78 async->my_accmap = mymap;
79 async->his_accmap = hismap | mymap;
83 * Encode into async HDLC byte code
86 async_Encode(struct async *async, u_char **cp, u_char c, int proto)
91 if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))
92 || (c == HDLC_ESC) || (c == HDLC_SYN)) {
96 if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {
105 async_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp,
106 int pri __unused, u_short *proto)
108 struct physical *p = link2physical(l);
109 u_char *cp, *sp, *ep;
114 if (!p || m_length(bp) > HDLCSIZE) {
119 oldcnt = m_length(bp);
122 ep = cp + HDLCSIZE - 10;
127 for (cnt = wp->m_len; cnt > 0; cnt--) {
128 async_Encode(&p->async, &cp, *sp++, *proto);
138 cnt = cp - p->async.xbuff;
140 bp = m_get(cnt, MB_ASYNCOUT);
141 memcpy(MBUF_CTOP(bp), p->async.xbuff, cnt);
142 bp->priv = cnt - oldcnt;
143 log_DumpBp(LogASYNC, "Write", bp);
149 async_Decode(struct async *async, u_char c)
153 if ((async->mode & MODE_HUNT) && c != HDLC_SYN)
158 async->mode &= ~MODE_HUNT;
159 if (async->length) { /* packet is ready. */
160 bp = m_get(async->length, MB_ASYNCIN);
161 mbuf_Write(bp, async->hbuff, async->length);
167 if (!(async->mode & MODE_ESC)) {
168 async->mode |= MODE_ESC;
173 if (async->length >= HDLCSIZE) {
174 /* packet is too large, discard it */
175 log_Printf(LogWARN, "Packet too large (%d), discarding.\n",
178 async->mode = MODE_HUNT;
181 if (async->mode & MODE_ESC) {
183 async->mode &= ~MODE_ESC;
185 async->hbuff[async->length++] = c;
192 async_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp,
193 u_short *proto __unused)
195 struct mbuf *nbp, **last;
196 struct physical *p = link2physical(l);
201 log_Printf(LogERROR, "Can't Pull an async packet from a logical link\n");
207 log_DumpBp(LogASYNC, "Read", bp);
210 for (cnt = bp->m_len; cnt; cnt--) {
211 *last = async_Decode(&p->async, *ch++);
213 last = &(*last)->m_nextpkt;
221 struct layer asynclayer =
222 { LAYER_ASYNC, "async", async_LayerPush, async_LayerPull };