1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 5 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 6 * Internet Initiative Japan, Inc (IIJ) 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #define CCP_MAXCODE CODE_RESETACK 34 35 #define TY_OUI 0 /* OUI */ 36 #define TY_PRED1 1 /* Predictor type 1 */ 37 #define TY_PRED2 2 /* Predictor type 2 */ 38 #define TY_PUDDLE 3 /* Puddle Jumper */ 39 #define TY_HWPPC 16 /* Hewlett-Packard PPC */ 40 #define TY_STAC 17 /* Stac Electronics LZS */ 41 #define TY_MSPPC 18 /* Microsoft PPC */ 42 #define TY_MPPE 18 /* Microsoft PPE */ 43 #define TY_GAND 19 /* Gandalf FZA */ 44 #define TY_V42BIS 20 /* V.42bis compression */ 45 #define TY_BSD 21 /* BSD LZW Compress */ 46 #define TY_PPPD_DEFLATE 24 /* Deflate (gzip) - (mis) numbered by pppd */ 47 #define TY_DEFLATE 26 /* Deflate (gzip) - rfc 1979 */ 48 49 #define CCP_NEG_DEFLATE 0 50 #define CCP_NEG_PRED1 1 51 #define CCP_NEG_DEFLATE24 2 52 #ifndef NODES 53 #define CCP_NEG_MPPE 3 54 #define CCP_NEG_TOTAL 4 55 #else 56 #define CCP_NEG_TOTAL 3 57 #endif 58 59 #ifndef NODES 60 enum mppe_negstate { 61 MPPE_ANYSTATE, 62 MPPE_STATELESS, 63 MPPE_STATEFUL 64 }; 65 #endif 66 67 struct mbuf; 68 struct link; 69 70 struct ccp_config { 71 struct { 72 struct { 73 int winsize; 74 } in, out; 75 } deflate; 76 #ifndef NODES 77 struct { 78 int keybits; 79 enum mppe_negstate state; 80 unsigned required : 1; 81 } mppe; 82 #endif 83 struct fsm_retry fsm; /* How often/frequently to resend requests */ 84 unsigned neg[CCP_NEG_TOTAL]; 85 }; 86 87 struct ccp_opt { 88 struct ccp_opt *next; 89 int algorithm; 90 struct fsm_opt val; 91 }; 92 93 struct ccp { 94 struct fsm fsm; /* The finite state machine */ 95 96 int his_proto; /* peer's compression protocol */ 97 int my_proto; /* our compression protocol */ 98 99 int reset_sent; /* If != -1, ignore compressed 'till ack */ 100 int last_reset; /* We can receive more (dups) w/ this id */ 101 102 struct { 103 int algorithm; /* Algorithm in use */ 104 void *state; /* Returned by implementations Init() */ 105 struct fsm_opt opt; /* Set by implementation's OptInit() */ 106 } in; 107 108 struct { 109 int algorithm; /* Algorithm in use */ 110 void *state; /* Returned by implementations Init() */ 111 struct ccp_opt *opt; /* Set by implementation's OptInit() */ 112 } out; 113 114 u_int32_t his_reject; /* Request codes rejected by peer */ 115 u_int32_t my_reject; /* Request codes I have rejected */ 116 117 u_long uncompout, compout; /* Outgoing bytes before/after compression */ 118 u_long uncompin, compin; /* Incoming bytes after/before decompression */ 119 120 struct ccp_config cfg; 121 }; 122 123 #define fsm2ccp(fp) (fp->proto == PROTO_CCP ? (struct ccp *)fp : NULL) 124 125 struct ccp_algorithm { 126 int id; 127 int Neg; /* ccp_config neg array item */ 128 const char *(*Disp)(struct fsm_opt *); /* Use result immediately ! */ 129 int (*Usable)(struct fsm *); /* Ok to negotiate ? */ 130 int (*Required)(struct fsm *); /* Must negotiate ? */ 131 struct { 132 int (*Set)(struct bundle *, struct fsm_opt *, const struct ccp_config *); 133 void *(*Init)(struct bundle *, struct fsm_opt *); 134 void (*Term)(void *); 135 void (*Reset)(void *); 136 struct mbuf *(*Read)(void *, struct ccp *, u_short *, struct mbuf *); 137 void (*DictSetup)(void *, struct ccp *, u_short, struct mbuf *); 138 } i; 139 struct { 140 int MTUOverhead; 141 void (*OptInit)(struct bundle *, struct fsm_opt *, 142 const struct ccp_config *); 143 int (*Set)(struct bundle *, struct fsm_opt *, const struct ccp_config *); 144 void *(*Init)(struct bundle *, struct fsm_opt *); 145 void (*Term)(void *); 146 int (*Reset)(void *); 147 struct mbuf *(*Write)(void *, struct ccp *, struct link *, int, u_short *, 148 struct mbuf *); 149 } o; 150 }; 151 152 extern void ccp_Init(struct ccp *, struct bundle *, struct link *, 153 const struct fsm_parent *); 154 extern void ccp_Setup(struct ccp *); 155 extern int ccp_Required(struct ccp *); 156 extern int ccp_MTUOverhead(struct ccp *); 157 158 extern void ccp_SendResetReq(struct fsm *); 159 extern struct mbuf *ccp_Input(struct bundle *, struct link *, struct mbuf *); 160 extern int ccp_ReportStatus(struct cmdargs const *); 161 extern u_short ccp_Proto(struct ccp *); 162 extern void ccp_SetupCallbacks(struct ccp *); 163 extern int ccp_SetOpenMode(struct ccp *); 164 extern int ccp_DefaultUsable(struct fsm *); 165 extern int ccp_DefaultRequired(struct fsm *); 166 167 extern struct layer ccplayer; 168