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: src/usr.sbin/ppp/proto.c,v 1.5.2.1 2000/08/19 09:30:08 brian Exp $ 27 * $DragonFly: src/usr.sbin/ppp/proto.c,v 1.2 2003/06/17 04:30:01 dillon Exp $ 28 */ 29 30 #include <sys/types.h> 31 32 #include <stdio.h> 33 #include <termios.h> 34 35 #include "layer.h" 36 #include "acf.h" 37 #include "defs.h" 38 #include "log.h" 39 #include "timer.h" 40 #include "fsm.h" 41 #include "mbuf.h" 42 #include "proto.h" 43 #include "throughput.h" 44 #include "lqr.h" 45 #include "hdlc.h" 46 #include "lcp.h" 47 #include "ccp.h" 48 #include "link.h" 49 50 int 51 proto_WrapperOctets(struct lcp *lcp, u_short proto) 52 { 53 return (lcp->his_protocomp && !(proto & 0xff00)) ? 1 : 2; 54 } 55 56 struct mbuf * 57 proto_Prepend(struct mbuf *bp, u_short proto, unsigned comp, int extra) 58 { 59 u_char cp[2]; 60 61 cp[0] = proto >> 8; 62 cp[1] = proto & 0xff; 63 64 if (comp && cp[0] == 0) 65 bp = m_prepend(bp, cp + 1, 1, extra); 66 else 67 bp = m_prepend(bp, cp, 2, extra); 68 69 return bp; 70 } 71 72 static struct mbuf * 73 proto_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp, 74 int pri, u_short *proto) 75 { 76 log_Printf(LogDEBUG, "proto_LayerPush: Using 0x%04x\n", *proto); 77 bp = proto_Prepend(bp, *proto, l->lcp.his_protocomp, 78 acf_WrapperOctets(&l->lcp, *proto)); 79 m_settype(bp, MB_PROTOOUT); 80 link_ProtocolRecord(l, *proto, PROTO_OUT); 81 82 return bp; 83 } 84 85 static struct mbuf * 86 proto_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, 87 u_short *proto) 88 { 89 u_char cp[2]; 90 size_t got; 91 92 if ((got = mbuf_View(bp, cp, 2)) == 0) { 93 m_freem(bp); 94 return NULL; 95 } 96 97 *proto = cp[0]; 98 if (!(*proto & 1)) { 99 if (got == 1) { 100 m_freem(bp); 101 return NULL; 102 } 103 bp = mbuf_Read(bp, cp, 2); 104 *proto = (*proto << 8) | cp[1]; 105 } else 106 bp = mbuf_Read(bp, cp, 1); 107 108 log_Printf(LogDEBUG, "proto_LayerPull: unknown -> 0x%04x\n", *proto); 109 m_settype(bp, MB_PROTOIN); 110 link_ProtocolRecord(l, *proto, PROTO_IN); 111 112 return bp; 113 } 114 115 struct layer protolayer = 116 { LAYER_PROTO, "proto", proto_LayerPush, proto_LayerPull }; 117