/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define CCP_MAXCODE CODE_RESETACK
#define TY_OUI 0 /* OUI */
#define TY_PRED1 1 /* Predictor type 1 */
#define TY_PRED2 2 /* Predictor type 2 */
#define TY_PUDDLE 3 /* Puddle Jumper */
#define TY_HWPPC 16 /* Hewlett-Packard PPC */
#define TY_STAC 17 /* Stac Electronics LZS */
#define TY_MSPPC 18 /* Microsoft PPC */
#define TY_MPPE 18 /* Microsoft PPE */
#define TY_GAND 19 /* Gandalf FZA */
#define TY_V42BIS 20 /* V.42bis compression */
#define TY_BSD 21 /* BSD LZW Compress */
#define TY_PPPD_DEFLATE 24 /* Deflate (gzip) - (mis) numbered by pppd */
#define TY_DEFLATE 26 /* Deflate (gzip) - rfc 1979 */
#define CCP_NEG_DEFLATE 0
#define CCP_NEG_PRED1 1
#define CCP_NEG_DEFLATE24 2
#ifndef NODES
#define CCP_NEG_MPPE 3
#define CCP_NEG_TOTAL 4
#else
#define CCP_NEG_TOTAL 3
#endif
#ifndef NODES
enum mppe_negstate {
MPPE_ANYSTATE,
MPPE_STATELESS,
MPPE_STATEFUL
};
#endif
struct mbuf;
struct link;
struct ccp_config {
struct {
struct {
int winsize;
} in, out;
} deflate;
#ifndef NODES
struct {
int keybits;
enum mppe_negstate state;
unsigned required : 1;
} mppe;
#endif
struct fsm_retry fsm; /* How often/frequently to resend requests */
unsigned neg[CCP_NEG_TOTAL];
};
struct ccp_opt {
struct ccp_opt *next;
int algorithm;
struct fsm_opt val;
};
struct ccp {
struct fsm fsm; /* The finite state machine */
int his_proto; /* peer's compression protocol */
int my_proto; /* our compression protocol */
int reset_sent; /* If != -1, ignore compressed 'till ack */
int last_reset; /* We can receive more (dups) w/ this id */
struct {
int algorithm; /* Algorithm in use */
void *state; /* Returned by implementations Init() */
struct fsm_opt opt; /* Set by implementation's OptInit() */
} in;
struct {
int algorithm; /* Algorithm in use */
void *state; /* Returned by implementations Init() */
struct ccp_opt *opt; /* Set by implementation's OptInit() */
} out;
u_int32_t his_reject; /* Request codes rejected by peer */
u_int32_t my_reject; /* Request codes I have rejected */
u_long uncompout, compout; /* Outgoing bytes before/after compression */
u_long uncompin, compin; /* Incoming bytes after/before decompression */
struct ccp_config cfg;
};
#define fsm2ccp(fp) (fp->proto == PROTO_CCP ? (struct ccp *)fp : NULL)
struct ccp_algorithm {
int id;
int Neg; /* ccp_config neg array item */
const char *(*Disp)(struct fsm_opt *); /* Use result immediately ! */
int (*Usable)(struct fsm *); /* Ok to negotiate ? */
int (*Required)(struct fsm *); /* Must negotiate ? */
struct {
int (*Set)(struct bundle *, struct fsm_opt *, const struct ccp_config *);
void *(*Init)(struct bundle *, struct fsm_opt *);
void (*Term)(void *);
void (*Reset)(void *);
struct mbuf *(*Read)(void *, struct ccp *, u_short *, struct mbuf *);
void (*DictSetup)(void *, struct ccp *, u_short, struct mbuf *);
} i;
struct {
int MTUOverhead;
void (*OptInit)(struct bundle *, struct fsm_opt *,
const struct ccp_config *);
int (*Set)(struct bundle *, struct fsm_opt *, const struct ccp_config *);
void *(*Init)(struct bundle *, struct fsm_opt *);
void (*Term)(void *);
int (*Reset)(void *);
struct mbuf *(*Write)(void *, struct ccp *, struct link *, int, u_short *,
struct mbuf *);
} o;
};
extern void ccp_Init(struct ccp *, struct bundle *, struct link *,
const struct fsm_parent *);
extern void ccp_Setup(struct ccp *);
extern int ccp_Required(struct ccp *);
extern int ccp_MTUOverhead(struct ccp *);
extern void ccp_SendResetReq(struct fsm *);
extern struct mbuf *ccp_Input(struct bundle *, struct link *, struct mbuf *);
extern int ccp_ReportStatus(struct cmdargs const *);
extern u_short ccp_Proto(struct ccp *);
extern void ccp_SetupCallbacks(struct ccp *);
extern int ccp_SetOpenMode(struct ccp *);
extern int ccp_DefaultUsable(struct fsm *);
extern int ccp_DefaultRequired(struct fsm *);
extern struct layer ccplayer;
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