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)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/types.h>
49 #include "throughput.h"
52 #include "descriptor.h"
55 #define MODE_HUNT 0x01
59 async_Init(struct async *async)
62 memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);
66 async_Setup(struct async *async)
68 async->mode = MODE_HUNT;
70 async->my_accmap = async->his_accmap = 0xffffffff;
74 async_SetLinkParams(struct async *async, u_int32_t mymap, u_int32_t hismap)
76 async->my_accmap = mymap;
77 async->his_accmap = hismap | mymap;
81 * Encode into async HDLC byte code
84 async_Encode(struct async *async, u_char **cp, u_char c, int proto)
89 if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))
90 || (c == HDLC_ESC) || (c == HDLC_SYN)) {
94 if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {
103 async_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp,
104 int pri __unused, u_short *proto)
106 struct physical *p = link2physical(l);
107 u_char *cp, *sp, *ep;
112 if (!p || m_length(bp) > HDLCSIZE) {
117 oldcnt = m_length(bp);
120 ep = cp + HDLCSIZE - 10;
125 for (cnt = wp->m_len; cnt > 0; cnt--) {
126 async_Encode(&p->async, &cp, *sp++, *proto);
136 cnt = cp - p->async.xbuff;
138 bp = m_get(cnt, MB_ASYNCOUT);
139 memcpy(MBUF_CTOP(bp), p->async.xbuff, cnt);
140 bp->priv = cnt - oldcnt;
141 log_DumpBp(LogASYNC, "Write", bp);
147 async_Decode(struct async *async, u_char c)
151 if ((async->mode & MODE_HUNT) && c != HDLC_SYN)
156 async->mode &= ~MODE_HUNT;
157 if (async->length) { /* packet is ready. */
158 bp = m_get(async->length, MB_ASYNCIN);
159 mbuf_Write(bp, async->hbuff, async->length);
165 if (!(async->mode & MODE_ESC)) {
166 async->mode |= MODE_ESC;
171 if (async->length >= HDLCSIZE) {
172 /* packet is too large, discard it */
173 log_Printf(LogWARN, "Packet too large (%d), discarding.\n",
176 async->mode = MODE_HUNT;
179 if (async->mode & MODE_ESC) {
181 async->mode &= ~MODE_ESC;
183 async->hbuff[async->length++] = c;
190 async_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp,
191 u_short *proto __unused)
193 struct mbuf *nbp, **last;
194 struct physical *p = link2physical(l);
199 log_Printf(LogERROR, "Can't Pull an async packet from a logical link\n");
205 log_DumpBp(LogASYNC, "Read", bp);
208 for (cnt = bp->m_len; cnt; cnt--) {
209 *last = async_Decode(&p->async, *ch++);
211 last = &(*last)->m_nextpkt;
219 struct layer asynclayer =
220 { LAYER_ASYNC, "async", async_LayerPush, async_LayerPull };