2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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)
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
33 #define CCP_MAXCODE CODE_RESETACK
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 */
49 #define CCP_NEG_DEFLATE 0
50 #define CCP_NEG_PRED1 1
51 #define CCP_NEG_DEFLATE24 2
53 #define CCP_NEG_MPPE 3
54 #define CCP_NEG_TOTAL 4
56 #define CCP_NEG_TOTAL 3
79 enum mppe_negstate state;
80 unsigned required : 1;
83 struct fsm_retry fsm; /* How often/frequently to resend requests */
84 unsigned neg[CCP_NEG_TOTAL];
94 struct fsm fsm; /* The finite state machine */
96 int his_proto; /* peer's compression protocol */
97 int my_proto; /* our compression protocol */
99 int reset_sent; /* If != -1, ignore compressed 'till ack */
100 int last_reset; /* We can receive more (dups) w/ this id */
103 int algorithm; /* Algorithm in use */
104 void *state; /* Returned by implementations Init() */
105 struct fsm_opt opt; /* Set by implementation's OptInit() */
109 int algorithm; /* Algorithm in use */
110 void *state; /* Returned by implementations Init() */
111 struct ccp_opt *opt; /* Set by implementation's OptInit() */
114 u_int32_t his_reject; /* Request codes rejected by peer */
115 u_int32_t my_reject; /* Request codes I have rejected */
117 u_long uncompout, compout; /* Outgoing bytes before/after compression */
118 u_long uncompin, compin; /* Incoming bytes after/before decompression */
120 struct ccp_config cfg;
123 #define fsm2ccp(fp) (fp->proto == PROTO_CCP ? (struct ccp *)fp : NULL)
125 struct ccp_algorithm {
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 ? */
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 *);
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 *,
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 *);
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 *);
167 extern struct layer ccplayer;