1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 31 #include <stdio.h> 32 #include <termios.h> 33 34 #include "layer.h" 35 #include "acf.h" 36 #include "defs.h" 37 #include "log.h" 38 #include "timer.h" 39 #include "fsm.h" 40 #include "mbuf.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 49 int 50 proto_WrapperOctets(struct lcp *lcp, u_short proto) 51 { 52 return (lcp->his_protocomp && !(proto & 0xff00)) ? 1 : 2; 53 } 54 55 struct mbuf * 56 proto_Prepend(struct mbuf *bp, u_short proto, unsigned comp, int extra) 57 { 58 u_char cp[2]; 59 60 cp[0] = proto >> 8; 61 cp[1] = proto & 0xff; 62 63 if (comp && cp[0] == 0) 64 bp = m_prepend(bp, cp + 1, 1, extra); 65 else 66 bp = m_prepend(bp, cp, 2, extra); 67 68 return bp; 69 } 70 71 static struct mbuf * 72 proto_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp, 73 int pri __unused, u_short *proto) 74 { 75 log_Printf(LogDEBUG, "proto_LayerPush: Using 0x%04x\n", *proto); 76 bp = proto_Prepend(bp, *proto, l->lcp.his_protocomp, 77 acf_WrapperOctets(&l->lcp, *proto)); 78 m_settype(bp, MB_PROTOOUT); 79 link_ProtocolRecord(l, *proto, PROTO_OUT); 80 81 return bp; 82 } 83 84 static struct mbuf * 85 proto_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp, 86 u_short *proto) 87 { 88 u_char cp[2]; 89 size_t got; 90 91 if ((got = mbuf_View(bp, cp, 2)) == 0) { 92 m_freem(bp); 93 return NULL; 94 } 95 96 *proto = cp[0]; 97 if (!(*proto & 1)) { 98 if (got == 1) { 99 m_freem(bp); 100 return NULL; 101 } 102 bp = mbuf_Read(bp, cp, 2); 103 *proto = (*proto << 8) | cp[1]; 104 } else 105 bp = mbuf_Read(bp, cp, 1); 106 107 log_Printf(LogDEBUG, "proto_LayerPull: unknown -> 0x%04x\n", *proto); 108 m_settype(bp, MB_PROTOIN); 109 link_ProtocolRecord(l, *proto, PROTO_IN); 110 111 return bp; 112 } 113 114 struct layer protolayer = 115 { LAYER_PROTO, "proto", proto_LayerPush, proto_LayerPull }; 116