* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
- *
- * $Id: ccp.c,v 1.3 1994/09/01 00:16:20 paulus Exp $
*/
#ifndef lint
-static char rcsid[] = "$Id: ccp.c,v 1.3 1994/09/01 00:16:20 paulus Exp $";
+static char rcsid[] = "$Id: ccp.c,v 1.19 1996/09/26 06:20:52 paulus Exp $";
#endif
+#include <string.h>
#include <syslog.h>
#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <net/ppp_defs.h>
+#include <net/ppp-comp.h>
#include "pppd.h"
-#include "ppp.h"
#include "fsm.h"
#include "ccp.h"
-fsm ccp_fsm[NPPP];
-ccp_options ccp_wantoptions[NPPP]; /* what to request the peer to use */
-ccp_options ccp_gotoptions[NPPP]; /* what the peer agreed to do */
-ccp_options ccp_allowoptions[NPPP]; /* what we'll agree to do */
-ccp_options ccp_hisoptions[NPPP]; /* what we agreed to do */
+/*
+ * Protocol entry points from main code.
+ */
+static void ccp_init __P((int unit));
+static void ccp_open __P((int unit));
+static void ccp_close __P((int unit, char *));
+static void ccp_lowerup __P((int unit));
+static void ccp_lowerdown __P((int));
+static void ccp_input __P((int unit, u_char *pkt, int len));
+static void ccp_protrej __P((int unit));
+static int ccp_printpkt __P((u_char *pkt, int len,
+ void (*printer) __P((void *, char *, ...)),
+ void *arg));
+static void ccp_datainput __P((int unit, u_char *pkt, int len));
+
+struct protent ccp_protent = {
+ PPP_CCP,
+ ccp_init,
+ ccp_input,
+ ccp_protrej,
+ ccp_lowerup,
+ ccp_lowerdown,
+ ccp_open,
+ ccp_close,
+ ccp_printpkt,
+ ccp_datainput,
+ 1,
+ "CCP",
+ NULL,
+ NULL,
+ NULL
+};
+
+fsm ccp_fsm[NUM_PPP];
+ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
+ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
+ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
+ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
/*
* Callbacks for fsm code.
*/
-static void ccp_resetci __ARGS((fsm *));
-static int ccp_cilen __ARGS((fsm *));
-static void ccp_addci __ARGS((fsm *, u_char *, int *));
-static int ccp_ackci __ARGS((fsm *, u_char *, int));
-static int ccp_nakci __ARGS((fsm *, u_char *, int));
-static int ccp_rejci __ARGS((fsm *, u_char *, int));
-static int ccp_reqci __ARGS((fsm *, u_char *, int *, int));
-static void ccp_up __ARGS((fsm *));
-static void ccp_down __ARGS((fsm *));
-static int ccp_extcode __ARGS((fsm *, int, int, u_char *, int));
-static void ccp_rack_timeout __ARGS(());
+static void ccp_resetci __P((fsm *));
+static int ccp_cilen __P((fsm *));
+static void ccp_addci __P((fsm *, u_char *, int *));
+static int ccp_ackci __P((fsm *, u_char *, int));
+static int ccp_nakci __P((fsm *, u_char *, int));
+static int ccp_rejci __P((fsm *, u_char *, int));
+static int ccp_reqci __P((fsm *, u_char *, int *, int));
+static void ccp_up __P((fsm *));
+static void ccp_down __P((fsm *));
+static int ccp_extcode __P((fsm *, int, int, u_char *, int));
+static void ccp_rack_timeout __P(());
+static char *method_name __P((ccp_options *, ccp_options *));
static fsm_callbacks ccp_callbacks = {
ccp_resetci,
};
/*
- * Length of configuration options, which describe possible
- * compression methods.
- */
-#define CILEN_BSD 3
-
-/*
- * Configuration option values for compression methods.
+ * Do we want / did we get any compression?
*/
-#define CI_BSD_COMPRESS 0x21
+#define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
+ || (opt).predictor_1 || (opt).predictor_2)
/*
- * Local state (mainly for handling reset-reqs and reset-acks
+ * Local state (mainly for handling reset-reqs and reset-acks).
*/
-static int ccp_localstate[NPPP];
+static int ccp_localstate[NUM_PPP];
#define RACK_PENDING 1 /* waiting for reset-ack */
#define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
#define RACKTIMEOUT 1 /* second */
+static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
+
/*
* ccp_init - initialize CCP.
*/
-void
+static void
ccp_init(unit)
int unit;
{
fsm *f = &ccp_fsm[unit];
f->unit = unit;
- f->protocol = CCP;
+ f->protocol = PPP_CCP;
f->callbacks = &ccp_callbacks;
fsm_init(f);
memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
- ccp_wantoptions[0].bsd_bits = 12; /* default value */
+ ccp_wantoptions[0].deflate = 1;
+ ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
+ ccp_allowoptions[0].deflate = 1;
+ ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
+ ccp_wantoptions[0].bsd_compress = 1;
+ ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
ccp_allowoptions[0].bsd_compress = 1;
- ccp_allowoptions[0].bsd_bits = MAX_BSD_BITS;
+ ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
+
+ ccp_allowoptions[0].predictor_1 = 1;
}
/*
* ccp_open - CCP is allowed to come up.
*/
-void
+static void
ccp_open(unit)
int unit;
{
if (f->state != OPENED)
ccp_flags_set(unit, 1, 0);
- if (!ccp_wantoptions[unit].bsd_compress)
+
+ /*
+ * Find out which compressors the kernel supports before
+ * deciding whether to open in silent mode.
+ */
+ ccp_resetci(f);
+ if (!ANY_COMPRESS(ccp_gotoptions[unit]))
f->flags |= OPT_SILENT;
+
fsm_open(f);
}
/*
* ccp_close - Terminate CCP.
*/
-void
-ccp_close(unit)
+static void
+ccp_close(unit, reason)
int unit;
+ char *reason;
{
ccp_flags_set(unit, 0, 0);
- fsm_close(&ccp_fsm[unit]);
+ fsm_close(&ccp_fsm[unit], reason);
}
/*
* ccp_lowerup - we may now transmit CCP packets.
*/
-void
+static void
ccp_lowerup(unit)
int unit;
{
/*
* ccp_lowerdown - we may not transmit CCP packets.
*/
-void
+static void
ccp_lowerdown(unit)
int unit;
{
/*
* ccp_input - process a received CCP packet.
*/
-void
+static void
ccp_input(unit, p, len)
int unit;
u_char *p;
int len;
{
- fsm_input(&ccp_fsm[unit], p, len);
+ fsm *f = &ccp_fsm[unit];
+ int oldstate;
+
+ /*
+ * Check for a terminate-request so we can print a message.
+ */
+ oldstate = f->state;
+ fsm_input(f, p, len);
+ if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED)
+ syslog(LOG_NOTICE, "Compression disabled by peer.");
+
+ /*
+ * If we get a terminate-ack and we're not asking for compression,
+ * close CCP.
+ */
+ if (oldstate == REQSENT && p[0] == TERMACK
+ && !ANY_COMPRESS(ccp_gotoptions[unit]))
+ ccp_close(unit, "No compression negotiated");
}
/*
int len;
{
switch (code) {
- case RESETREQ:
+ case CCP_RESETREQ:
if (f->state != OPENED)
break;
/* send a reset-ack, which the transmitter will see and
reset its compression state. */
- fsm_sdata(f, RESETACK, id, NULL, 0);
+ fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
break;
- case RESETACK:
+ case CCP_RESETACK:
if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
UNTIMEOUT(ccp_rack_timeout, (caddr_t) f);
/*
* ccp_protrej - peer doesn't talk CCP.
*/
-void
+static void
ccp_protrej(unit)
int unit;
{
u_char opt_buf[16];
*go = ccp_wantoptions[f->unit];
+ all_rejected[f->unit] = 0;
+
+ /*
+ * Check whether the kernel knows about the various
+ * compression methods we might request.
+ */
if (go->bsd_compress) {
opt_buf[0] = CI_BSD_COMPRESS;
- opt_buf[1] = CILEN_BSD;
- opt_buf[2] = go->bsd_bits;
- if (!ccp_test(f->unit, opt_buf, 3, 0))
+ opt_buf[1] = CILEN_BSD_COMPRESS;
+ opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
+ if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
go->bsd_compress = 0;
}
+ if (go->deflate) {
+ opt_buf[0] = CI_DEFLATE;
+ opt_buf[1] = CILEN_DEFLATE;
+ opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_SIZE);
+ opt_buf[3] = DEFLATE_CHK_SEQUENCE;
+ if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
+ go->deflate = 0;
+ }
+ if (go->predictor_1) {
+ opt_buf[0] = CI_PREDICTOR_1;
+ opt_buf[1] = CILEN_PREDICTOR_1;
+ if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
+ go->predictor_1 = 0;
+ }
+ if (go->predictor_2) {
+ opt_buf[0] = CI_PREDICTOR_2;
+ opt_buf[1] = CILEN_PREDICTOR_2;
+ if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
+ go->predictor_2 = 0;
+ }
}
/*
{
ccp_options *go = &ccp_gotoptions[f->unit];
- return (go->bsd_compress? CILEN_BSD: 0);
+ return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
+ + (go->deflate? CILEN_DEFLATE: 0)
+ + (go->predictor_1? CILEN_PREDICTOR_1: 0)
+ + (go->predictor_2? CILEN_PREDICTOR_2: 0);
}
/*
u_char *p;
int *lenp;
{
+ int res;
ccp_options *go = &ccp_gotoptions[f->unit];
u_char *p0 = p;
+ /*
+ * Add the compression types that we can receive, in decreasing
+ * preference order. Get the kernel to allocate the first one
+ * in case it gets Acked.
+ */
+ if (go->deflate) {
+ p[0] = CI_DEFLATE;
+ p[1] = CILEN_DEFLATE;
+ p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
+ p[3] = DEFLATE_CHK_SEQUENCE;
+ for (;;) {
+ res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
+ if (res > 0) {
+ p += CILEN_DEFLATE;
+ break;
+ }
+ if (res < 0 || go->deflate_size <= DEFLATE_MIN_SIZE) {
+ go->deflate = 0;
+ break;
+ }
+ --go->deflate_size;
+ p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
+ }
+ }
if (go->bsd_compress) {
p[0] = CI_BSD_COMPRESS;
- p[1] = CILEN_BSD;
- p[2] = go->bsd_bits;
- p += 3;
+ p[1] = CILEN_BSD_COMPRESS;
+ p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
+ if (p != p0) {
+ p += CILEN_BSD_COMPRESS; /* not the first option */
+ } else {
+ for (;;) {
+ res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
+ if (res > 0) {
+ p += CILEN_BSD_COMPRESS;
+ break;
+ }
+ if (res < 0 || go->bsd_bits <= BSD_MIN_BITS) {
+ go->bsd_compress = 0;
+ break;
+ }
+ --go->bsd_bits;
+ p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
+ }
+ }
+ }
+ /* XXX Should Predictor 2 be preferable to Predictor 1? */
+ if (go->predictor_1) {
+ p[0] = CI_PREDICTOR_1;
+ p[1] = CILEN_PREDICTOR_1;
+ if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
+ go->predictor_1 = 0;
+ } else {
+ p += CILEN_PREDICTOR_1;
+ }
}
+ if (go->predictor_2) {
+ p[0] = CI_PREDICTOR_2;
+ p[1] = CILEN_PREDICTOR_2;
+ if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
+ go->predictor_2 = 0;
+ } else {
+ p += CILEN_PREDICTOR_2;
+ }
+ }
+
+ go->method = (p > p0)? p0[0]: -1;
+
*lenp = p - p0;
}
int len;
{
ccp_options *go = &ccp_gotoptions[f->unit];
+ u_char *p0 = p;
+ if (go->deflate) {
+ if (len < CILEN_DEFLATE
+ || p[0] != CI_DEFLATE || p[1] != CILEN_DEFLATE
+ || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
+ || p[3] != DEFLATE_CHK_SEQUENCE)
+ return 0;
+ p += CILEN_DEFLATE;
+ len -= CILEN_DEFLATE;
+ /* XXX Cope with first/fast ack */
+ if (len == 0)
+ return 1;
+ }
if (go->bsd_compress) {
- if (len != 3 || p[0] != CI_BSD_COMPRESS
- || p[1] != CILEN_BSD || p[2] != go->bsd_bits)
+ if (len < CILEN_BSD_COMPRESS
+ || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
+ || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
return 0;
- p += 3;
- len -= 3;
+ p += CILEN_BSD_COMPRESS;
+ len -= CILEN_BSD_COMPRESS;
+ /* XXX Cope with first/fast ack */
+ if (p == p0 && len == 0)
+ return 1;
}
+ if (go->predictor_1) {
+ if (len < CILEN_PREDICTOR_1
+ || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
+ return 0;
+ p += CILEN_PREDICTOR_1;
+ len -= CILEN_PREDICTOR_1;
+ /* XXX Cope with first/fast ack */
+ if (p == p0 && len == 0)
+ return 1;
+ }
+ if (go->predictor_2) {
+ if (len < CILEN_PREDICTOR_2
+ || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
+ return 0;
+ p += CILEN_PREDICTOR_2;
+ len -= CILEN_PREDICTOR_2;
+ /* XXX Cope with first/fast ack */
+ if (p == p0 && len == 0)
+ return 1;
+ }
+
if (len != 0)
return 0;
return 1;
memset(&no, 0, sizeof(no));
try = *go;
- if (go->bsd_compress && len >= CILEN_BSD && p[0] == CI_BSD_COMPRESS
- && p[1] == CILEN_BSD) {
+ if (go->deflate && len >= CILEN_DEFLATE
+ && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
+ no.deflate = 1;
+ /*
+ * Peer wants us to use a different code size or something.
+ * Stop asking for Deflate if we don't understand his suggestion.
+ */
+ if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
+ || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_SIZE
+ || p[3] != DEFLATE_CHK_SEQUENCE)
+ try.deflate = 0;
+ else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
+ go->deflate_size = DEFLATE_SIZE(p[2]);
+ p += CILEN_DEFLATE;
+ len -= CILEN_DEFLATE;
+ }
+
+ if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
+ && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
no.bsd_compress = 1;
/*
- * Peer wants us to use a different number of bits.
+ * Peer wants us to use a different number of bits
+ * or a different version.
*/
- if (p[2] < go->bsd_bits)
- try.bsd_bits = p[2];
- p += CILEN_BSD;
- len -= CILEN_BSD;
+ if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
+ try.bsd_compress = 0;
+ else if (BSD_NBITS(p[2]) < go->bsd_bits)
+ try.bsd_bits = BSD_NBITS(p[2]);
+ p += CILEN_BSD_COMPRESS;
+ len -= CILEN_BSD_COMPRESS;
}
/*
- * Have a look at any remaining options...???
+ * Predictor-1 and 2 have no options, so they can't be Naked.
+ *
+ * XXX What should we do with any remaining options?
*/
if (len != 0)
try = *go;
- if (go->bsd_compress && len >= CILEN_BSD && p[0] == CI_BSD_COMPRESS
- && p[1] == CILEN_BSD) {
- if (p[2] != go->bsd_bits)
+ /*
+ * Cope with empty configure-rejects by ceasing to send
+ * configure-requests.
+ */
+ if (len == 0 && all_rejected[f->unit])
+ return -1;
+
+ if (go->deflate && len >= CILEN_DEFLATE
+ && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
+ if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
+ || p[3] != DEFLATE_CHK_SEQUENCE)
+ return 0; /* Rej is bad */
+ try.deflate = 0;
+ p += CILEN_DEFLATE;
+ len -= CILEN_DEFLATE;
+ }
+ if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
+ && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
+ if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
return 0;
try.bsd_compress = 0;
- p += CILEN_BSD;
- len -= CILEN_BSD;
+ p += CILEN_BSD_COMPRESS;
+ len -= CILEN_BSD_COMPRESS;
+ }
+ if (go->predictor_1 && len >= CILEN_PREDICTOR_1
+ && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
+ try.predictor_1 = 0;
+ p += CILEN_PREDICTOR_1;
+ len -= CILEN_PREDICTOR_1;
+ }
+ if (go->predictor_2 && len >= CILEN_PREDICTOR_2
+ && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
+ try.predictor_2 = 0;
+ p += CILEN_PREDICTOR_2;
+ len -= CILEN_PREDICTOR_2;
}
if (len != 0)
int *lenp;
int dont_nak;
{
- int ret, newret;
+ int ret, newret, res;
u_char *p0, *retp;
- int len, clen, type;
+ int len, clen, type, nb;
ccp_options *ho = &ccp_hisoptions[f->unit];
ccp_options *ao = &ccp_allowoptions[f->unit];
len = *lenp;
memset(ho, 0, sizeof(ccp_options));
+ ho->method = (len > 0)? p[0]: -1;
while (len > 0) {
newret = CONFACK;
clen = p[1];
switch (type) {
+ case CI_DEFLATE:
+ if (!ao->deflate || clen != CILEN_DEFLATE) {
+ newret = CONFREJ;
+ break;
+ }
+
+ ho->deflate = 1;
+ ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
+ if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
+ || p[3] != DEFLATE_CHK_SEQUENCE
+ || nb > ao->deflate_size || nb < DEFLATE_MIN_SIZE) {
+ newret = CONFNAK;
+ if (!dont_nak) {
+ p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
+ p[3] = DEFLATE_CHK_SEQUENCE;
+ }
+ break;
+ }
+
+ /*
+ * Check whether we can do Deflate with the window
+ * size they want. If the window is too big, reduce
+ * it until the kernel can cope and nak with that.
+ * We only check this for the first option.
+ */
+ if (p == p0) {
+ for (;;) {
+ res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
+ if (res > 0)
+ break; /* it's OK now */
+ if (res < 0 || nb == DEFLATE_MIN_SIZE || dont_nak) {
+ newret = CONFREJ;
+ p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
+ break;
+ }
+ newret = CONFNAK;
+ --nb;
+ p[2] = DEFLATE_MAKE_OPT(nb);
+ }
+ }
+ break;
+
case CI_BSD_COMPRESS:
- if (!ao->bsd_compress || clen != CILEN_BSD) {
+ if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
newret = CONFREJ;
break;
}
ho->bsd_compress = 1;
- ho->bsd_bits = p[2];
- if (ho->bsd_bits < MIN_BSD_BITS
- || ho->bsd_bits > ao->bsd_bits) {
+ ho->bsd_bits = nb = BSD_NBITS(p[2]);
+ if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
+ || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
newret = CONFNAK;
- } else if (!ccp_test(f->unit, p, CILEN_BSD, 1)) {
- if (ho->bsd_bits > MIN_BSD_BITS)
+ if (!dont_nak)
+ p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
+ break;
+ }
+
+ /*
+ * Check whether we can do BSD-Compress with the code
+ * size they want. If the code size is too big, reduce
+ * it until the kernel can cope and nak with that.
+ * We only check this for the first option.
+ */
+ if (p == p0) {
+ for (;;) {
+ res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
+ if (res > 0)
+ break;
+ if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
+ newret = CONFREJ;
+ p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
+ ho->bsd_bits);
+ break;
+ }
newret = CONFNAK;
- else
- newret = CONFREJ;
+ --nb;
+ p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
+ }
}
- if (newret == CONFNAK && !dont_nak) {
- p[2] = (ho->bsd_bits < ao->bsd_bits? MIN_BSD_BITS:
- ao->bsd_bits);
+ break;
+
+ case CI_PREDICTOR_1:
+ if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
+ newret = CONFREJ;
+ break;
}
+ ho->predictor_1 = 1;
+ if (p == p0
+ && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
+ newret = CONFREJ;
+ }
+ break;
+
+ case CI_PREDICTOR_2:
+ if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
+ newret = CONFREJ;
+ break;
+ }
+
+ ho->predictor_2 = 1;
+ if (p == p0
+ && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
+ newret = CONFREJ;
+ }
break;
default:
}
}
+ if (newret == CONFNAK && dont_nak)
+ newret = CONFREJ;
if (!(newret == CONFACK || newret == CONFNAK && ret == CONFREJ)) {
/* we're returning this option */
+ if (newret == CONFREJ && ret == CONFNAK)
+ retp = p0;
ret = newret;
if (p != retp)
BCOPY(p, retp, clen);
len -= clen;
}
- if (ret != CONFACK)
- *lenp = retp - p0;
+ if (ret != CONFACK) {
+ if (ret == CONFREJ && *lenp == retp - p0)
+ all_rejected[f->unit] = 1;
+ else
+ *lenp = retp - p0;
+ }
return ret;
}
/*
- * CCP has come up - inform the kernel driver.
+ * Make a string name for a compression method (or 2).
*/
-static char *up_strings[] = {
- "no ", "receive ", "transmit ", ""
-};
+static char *
+method_name(opt, opt2)
+ ccp_options *opt, *opt2;
+{
+ static char result[64];
+
+ if (!ANY_COMPRESS(*opt))
+ return "(none)";
+ switch (opt->method) {
+ case CI_DEFLATE:
+ if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
+ sprintf(result, "Deflate (%d/%d)", opt->deflate_size,
+ opt2->deflate_size);
+ else
+ sprintf(result, "Deflate (%d)", opt->deflate_size);
+ break;
+ case CI_BSD_COMPRESS:
+ if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
+ sprintf(result, "BSD-Compress (%d/%d)", opt->bsd_bits,
+ opt2->bsd_bits);
+ else
+ sprintf(result, "BSD-Compress (%d)", opt->bsd_bits);
+ break;
+ case CI_PREDICTOR_1:
+ return "Predictor 1";
+ case CI_PREDICTOR_2:
+ return "Predictor 2";
+ default:
+ sprintf(result, "Method %d", opt->method);
+ }
+ return result;
+}
+/*
+ * CCP has come up - inform the kernel driver and log a message.
+ */
static void
ccp_up(f)
fsm *f;
{
ccp_options *go = &ccp_gotoptions[f->unit];
ccp_options *ho = &ccp_hisoptions[f->unit];
+ char method1[64];
ccp_flags_set(f->unit, 1, 1);
- syslog(LOG_INFO, "%scompression enabled",
- up_strings[(go->bsd_compress? 1: 0) + (ho->bsd_compress? 2: 0)]);
+ if (ANY_COMPRESS(*go)) {
+ if (ANY_COMPRESS(*ho)) {
+ if (go->method == ho->method) {
+ syslog(LOG_NOTICE, "%s compression enabled",
+ method_name(go, ho));
+ } else {
+ strcpy(method1, method_name(go, NULL));
+ syslog(LOG_NOTICE, "%s / %s compression enabled",
+ method1, method_name(ho, NULL));
+ }
+ } else
+ syslog(LOG_NOTICE, "%s receive compression enabled",
+ method_name(go, NULL));
+ } else if (ANY_COMPRESS(*ho))
+ syslog(LOG_NOTICE, "%s transmit compression enabled",
+ method_name(ho, NULL));
}
/*
UNTIMEOUT(ccp_rack_timeout, (caddr_t) f);
ccp_localstate[f->unit] = 0;
ccp_flags_set(f->unit, 1, 0);
- syslog(LOG_NOTICE, "Compression disabled.");
}
/*
* Print the contents of a CCP packet.
*/
-char *ccp_codenames[] = {
+static char *ccp_codenames[] = {
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
"TermReq", "TermAck", "CodeRej",
NULL, NULL, NULL, NULL, NULL, NULL,
"ResetReq", "ResetAck",
};
-int
+static int
ccp_printpkt(p, plen, printer, arg)
u_char *p;
int plen;
- void (*printer) __ARGS((void *, char *, ...));
+ void (*printer) __P((void *, char *, ...));
void *arg;
{
u_char *p0, *optend;
len -= optlen;
optend = p + optlen;
switch (code) {
+ case CI_DEFLATE:
+ if (optlen >= CILEN_DEFLATE) {
+ printer(arg, "deflate %d", DEFLATE_SIZE(p[2]));
+ if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
+ printer(arg, " method %d", DEFLATE_METHOD(p[2]));
+ if (p[3] != DEFLATE_CHK_SEQUENCE)
+ printer(arg, " check %d", p[3]);
+ p += CILEN_DEFLATE;
+ }
+ break;
case CI_BSD_COMPRESS:
- if (optlen >= CILEN_BSD) {
- printer(arg, "bsd %d", p[2]);
- p += CILEN_BSD;
+ if (optlen >= CILEN_BSD_COMPRESS) {
+ printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
+ BSD_NBITS(p[2]));
+ p += CILEN_BSD_COMPRESS;
+ }
+ break;
+ case CI_PREDICTOR_1:
+ if (optlen >= CILEN_PREDICTOR_1) {
+ printer(arg, "predictor 1");
+ p += CILEN_PREDICTOR_1;
+ }
+ break;
+ case CI_PREDICTOR_2:
+ if (optlen >= CILEN_PREDICTOR_2) {
+ printer(arg, "predictor 2");
+ p += CILEN_PREDICTOR_2;
}
break;
}
printer(arg, ">");
}
break;
+
+ case TERMACK:
+ case TERMREQ:
+ if (len > 0 && *p >= ' ' && *p < 0x7f) {
+ print_string(p, len, printer, arg);
+ p += len;
+ len = 0;
+ }
+ break;
}
/* dump out the rest of the packet in hex */
/*
* We have received a packet that the decompressor failed to
- * decompress. Here we would expect to issue a reset-request,
- * but Motorola has a patent on that, so instead we log a message
- * and take CCP down :-(. (See US patent 5,130,993; international
- * patent publication number WO 91/10289; Australian patent 73296/91.)
+ * decompress. Here we would expect to issue a reset-request, but
+ * Motorola has a patent on resetting the compressor as a result of
+ * detecting an error in the decompressed data after decompression.
+ * (See US patent 5,130,993; international patent publication number
+ * WO 91/10289; Australian patent 73296/91.)
+ *
+ * So we ask the kernel whether the error was detected after
+ * decompression; if it was, we take CCP down, thus disabling
+ * compression :-(, otherwise we issue the reset-request.
*/
-void
+static void
ccp_datainput(unit, pkt, len)
int unit;
u_char *pkt;
f = &ccp_fsm[unit];
if (f->state == OPENED) {
- syslog(LOG_ERR, "Lost compression sync: disabling compression");
- ccp_close(unit);
- }
-}
-
-/*
- * ccp_req_reset - Request that the peer reset the compression
- * dictionary.
- */
-void
-ccp_req_reset(f)
- fsm *f;
-{
- if (f->state == OPENED) {
- if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
- fsm_sdata(f, RESETREQ, f->reqid = ++f->id, NULL, 0);
- TIMEOUT(ccp_rack_timeout, (caddr_t) f, RACKTIMEOUT);
- ccp_localstate[f->unit] |= RACK_PENDING;
- } else
- ccp_localstate[f->unit] |= RREQ_REPEAT;
+ if (ccp_fatal_error(unit)) {
+ /*
+ * Disable compression by taking CCP down.
+ */
+ syslog(LOG_ERR, "Lost compression sync: disabling compression");
+ ccp_close(unit, "Lost compression sync");
+ } else {
+ /*
+ * Send a reset-request to reset the peer's compressor.
+ * We don't do that if we are still waiting for an
+ * acknowledgement to a previous reset-request.
+ */
+ if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
+ fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
+ TIMEOUT(ccp_rack_timeout, (caddr_t) f, RACKTIMEOUT);
+ ccp_localstate[f->unit] |= RACK_PENDING;
+ } else
+ ccp_localstate[f->unit] |= RREQ_REPEAT;
+ }
}
}
fsm *f = (fsm *) arg;
if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
- fsm_sdata(f, RESETREQ, f->reqid, NULL, 0);
+ fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
TIMEOUT(ccp_rack_timeout, (caddr_t) f, RACKTIMEOUT);
ccp_localstate[f->unit] &= ~RREQ_REPEAT;
} else
projects / ppp.git / blobdiff