1 /*- 2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/types.h> 30 31 #include <stdio.h> 32 #include <termios.h> 33 34 #include "defs.h" 35 #include "layer.h" 36 #include "timer.h" 37 #include "fsm.h" 38 #include "log.h" 39 #include "mbuf.h" 40 #include "acf.h" 41 #include "proto.h" 42 #include "throughput.h" 43 #include "lqr.h" 44 #include "hdlc.h" 45 #include "lcp.h" 46 #include "ccp.h" 47 #include "link.h" 48 #include "descriptor.h" 49 #include "async.h" 50 #include "physical.h" 51 52 int 53 acf_WrapperOctets(struct lcp *lcp, u_short proto) 54 { 55 return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0; 56 } 57 58 static struct mbuf * 59 acf_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp, 60 int pri, u_short *proto) 61 { 62 const u_char cp[2] = { HDLC_ADDR, HDLC_UI }; 63 64 if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) { 65 bp = m_prepend(bp, cp, 2, 0); 66 m_settype(bp, MB_ACFOUT); 67 } 68 69 return bp; 70 } 71 72 static struct mbuf * 73 acf_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto) 74 { 75 struct physical *p = link2physical(l); 76 u_char cp[2]; 77 78 if (!p) { 79 log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n"); 80 return bp; 81 } 82 83 if (mbuf_View(bp, cp, 2) == 2) { 84 if (!p->link.lcp.want_acfcomp) { 85 /* We expect the packet not to be compressed */ 86 bp = mbuf_Read(bp, cp, 2); 87 if (cp[0] != HDLC_ADDR) { 88 p->hdlc.lqm.ifInErrors++; 89 p->hdlc.stats.badaddr++; 90 log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]); 91 m_freem(bp); 92 return NULL; 93 } 94 if (cp[1] != HDLC_UI) { 95 p->hdlc.lqm.ifInErrors++; 96 p->hdlc.stats.badcommand++; 97 log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]); 98 m_freem(bp); 99 return NULL; 100 } 101 m_settype(bp, MB_ACFIN); 102 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 103 /* 104 * We can receive compressed packets, but the peer still sends 105 * uncompressed packets (or maybe this is a PROTO_LCP packet) ! 106 */ 107 bp = mbuf_Read(bp, cp, 2); 108 m_settype(bp, MB_ACFIN); 109 } 110 } 111 112 return bp; 113 } 114 115 struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull }; 116