| hdlc.c (50479) | hdlc.c (54912) |
|---|---|
| 1/* 2 * PPP High Level Link Control (HDLC) Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * | 1/* 2 * PPP High Level Link Control (HDLC) Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * |
| 20 * $FreeBSD: head/usr.sbin/ppp/hdlc.c 50479 1999-08-28 01:35:59Z peter $ | 20 * $FreeBSD: head/usr.sbin/ppp/hdlc.c 54912 1999-12-20 20:29:47Z brian $ |
| 21 * 22 * TODO: 23 */ 24#include <sys/param.h> 25#include <sys/un.h> 26 27#include <stdio.h> 28#include <string.h> --- 81 unchanged lines hidden (view full) --- 110} 111 112static inline u_short 113HdlcFcsBuf(u_short fcs, struct mbuf *m) 114{ 115 int len; 116 u_char *pos, *end; 117 | 21 * 22 * TODO: 23 */ 24#include <sys/param.h> 25#include <sys/un.h> 26 27#include <stdio.h> 28#include <string.h> --- 81 unchanged lines hidden (view full) --- 110} 111 112static inline u_short 113HdlcFcsBuf(u_short fcs, struct mbuf *m) 114{ 115 int len; 116 u_char *pos, *end; 117 |
| 118 len = mbuf_Length(m); | 118 len = m_length(m); |
| 119 pos = MBUF_CTOP(m); | 119 pos = MBUF_CTOP(m); |
| 120 end = pos + m->cnt; | 120 end = pos + m->m_len; |
| 121 while (len--) { 122 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 123 if (pos == end && len) { | 121 while (len--) { 122 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; 123 if (pos == end && len) { |
| 124 m = m->next; | 124 m = m->m_next; |
| 125 pos = MBUF_CTOP(m); | 125 pos = MBUF_CTOP(m); |
| 126 end = pos + m->cnt; | 126 end = pos + m->m_len; |
| 127 } 128 } 129 return (fcs); 130} 131 132int 133hdlc_WrapperOctets(struct lcp *lcp, u_short proto) 134{ 135 return 2; 136} 137 138static struct mbuf * 139hdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 140 int pri, u_short *proto) 141{ 142 struct mbuf *last; 143 u_char *cp; 144 u_short fcs; 145 | 127 } 128 } 129 return (fcs); 130} 131 132int 133hdlc_WrapperOctets(struct lcp *lcp, u_short proto) 134{ 135 return 2; 136} 137 138static struct mbuf * 139hdlc_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 140 int pri, u_short *proto) 141{ 142 struct mbuf *last; 143 u_char *cp; 144 u_short fcs; 145 |
| 146 mbuf_SetType(bp, MB_HDLCOUT); | 146 m_settype(bp, MB_HDLCOUT); |
| 147 fcs = HdlcFcsBuf(INITFCS, bp); 148 fcs = ~fcs; 149 | 147 fcs = HdlcFcsBuf(INITFCS, bp); 148 fcs = ~fcs; 149 |
| 150 for (last = bp; last->next; last = last->next) | 150 for (last = bp; last->m_next; last = last->m_next) |
| 151 ; 152 | 151 ; 152 |
| 153 if (last->size - last->offset - last->cnt >= 2) { 154 cp = MBUF_CTOP(last) + last->cnt; 155 last->cnt += 2; | 153 if (last->m_size - last->m_offset - last->m_len >= 2) { 154 cp = MBUF_CTOP(last) + last->m_len; 155 last->m_len += 2; |
| 156 } else { | 156 } else { |
| 157 struct mbuf *tail = mbuf_Alloc(2, MB_HDLCOUT); 158 last->next = tail; | 157 struct mbuf *tail = m_get(2, MB_HDLCOUT); 158 last->m_next = tail; |
| 159 cp = MBUF_CTOP(tail); 160 } 161 162 *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 163 *cp++ = fcs >> 8; 164 165 log_DumpBp(LogHDLC, "hdlc_Output", bp); 166 --- 134 unchanged lines hidden (view full) --- 301 u_short fcs; 302 int len; 303 304 if (!p) { 305 log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 306 return bp; 307 } 308 | 159 cp = MBUF_CTOP(tail); 160 } 161 162 *cp++ = fcs & 0377; /* Low byte first (nothing like consistency) */ 163 *cp++ = fcs >> 8; 164 165 log_DumpBp(LogHDLC, "hdlc_Output", bp); 166 --- 134 unchanged lines hidden (view full) --- 301 u_short fcs; 302 int len; 303 304 if (!p) { 305 log_Printf(LogERROR, "Can't Pull a hdlc packet from a logical link\n"); 306 return bp; 307 } 308 |
| 309 log_DumpBp(LogHDLC, "hdlc_Input:", bp); | 309 log_DumpBp(LogHDLC, "hdlc_LayerPull:", bp); |
| 310 | 310 |
| 311 fcs = hdlc_Fcs(MBUF_CTOP(bp), bp->cnt); | 311 fcs = hdlc_Fcs(MBUF_CTOP(bp), bp->m_len); |
| 312 | 312 |
| 313 log_Printf(LogDEBUG, "%s: hdlc_Input: fcs = %04x (%s)\n", | 313 log_Printf(LogDEBUG, "%s: hdlc_LayerPull: fcs = %04x (%s)\n", |
| 314 p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 315 316 if (fcs != GOODFCS) { 317 p->hdlc.lqm.SaveInErrors++; 318 p->hdlc.stats.badfcs++; | 314 p->link.name, fcs, (fcs == GOODFCS) ? "good" : "BAD!"); 315 316 if (fcs != GOODFCS) { 317 p->hdlc.lqm.SaveInErrors++; 318 p->hdlc.stats.badfcs++; |
| 319 mbuf_Free(bp); | 319 m_freem(bp); |
| 320 return NULL; 321 } 322 | 320 return NULL; 321 } 322 |
| 323 p->hdlc.lqm.SaveInOctets += bp->cnt + 1; | 323 p->hdlc.lqm.SaveInOctets += bp->m_len + 1; |
| 324 p->hdlc.lqm.SaveInPackets++; 325 | 324 p->hdlc.lqm.SaveInPackets++; 325 |
| 326 len = mbuf_Length(bp); | 326 len = m_length(bp); |
| 327 if (len < 4) { /* rfc1662 section 4.3 */ | 327 if (len < 4) { /* rfc1662 section 4.3 */ |
| 328 mbuf_Free(bp); | 328 m_freem(bp); |
| 329 bp = NULL; 330 } 331 | 329 bp = NULL; 330 } 331 |
| 332 bp = mbuf_Truncate(bp, len - 2); /* discard the FCS */ 333 mbuf_SetType(bp, MB_HDLCIN); | 332 bp = m_adj(bp, -2); /* discard the FCS */ 333 m_settype(bp, MB_HDLCIN); |
| 334 335 return bp; 336} 337 338/* Detect a HDLC frame */ 339 340static const struct frameheader { 341 const u_char *data; --- 89 unchanged lines hidden --- | 334 335 return bp; 336} 337 338/* Detect a HDLC frame */ 339 340static const struct frameheader { 341 const u_char *data; --- 89 unchanged lines hidden --- |