*/
#ifndef lint
-static char rcsid[] = "$Id: ccp.c,v 1.12 1995/10/27 03:42:52 paulus Exp $";
+static char rcsid[] = "$Id: ccp.c,v 1.18 1996/09/14 05:14:36 paulus Exp $";
#endif
+#include <string.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <net/ppp-comp.h>
#include "fsm.h"
#include "ccp.h"
+/*
+ * 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 */
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,
/*
* ccp_init - initialize CCP.
*/
-void
+static void
ccp_init(unit)
int unit;
{
memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
- ccp_wantoptions[0].bsd_compress = 1;
- 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 = BSD_MAX_BITS;
+
+ ccp_allowoptions[0].predictor_1 = 1;
}
/*
if (f->state != OPENED)
ccp_flags_set(unit, 1, 0);
- if (!ANY_COMPRESS(ccp_wantoptions[unit]))
+
+ /*
+ * 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;
*/
if (oldstate == REQSENT && p[0] == TERMACK
&& !ANY_COMPRESS(ccp_gotoptions[unit]))
- ccp_close(unit);
+ ccp_close(unit, "No compression negotiated");
}
/*
/*
* ccp_protrej - peer doesn't talk CCP.
*/
-void
+static void
ccp_protrej(unit)
int unit;
{
ccp_resetci(f)
fsm *f;
{
- int ok;
ccp_options *go = &ccp_gotoptions[f->unit];
u_char opt_buf[16];
}
}
+ go->method = (p > p0)? p0[0]: -1;
+
*lenp = p - p0;
}
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 (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;
len = *lenp;
memset(ho, 0, sizeof(ccp_options));
+ ho->method = (len > 0)? p[0]: -1;
while (len > 0) {
newret = CONFACK;
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 > ao->deflate_size || nb < DEFLATE_MIN_SIZE) {
newret = CONFNAK;
- nb = ao->deflate_size;
- } else {
- /*
- * 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.
- */
+ 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 (;;) {
- if (nb < DEFLATE_MIN_SIZE) {
+ 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;
}
- p[2] = DEFLATE_MAKE_OPT(nb);
- res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
- if (res != 0) {
- if (res < 0)
- newret = CONFREJ;
- break;
- }
newret = CONFNAK;
--nb;
- }
- }
- if (newret == CONFNAK && !dont_nak) {
- if (nb >= DEFLATE_MIN_SIZE) {
p[2] = DEFLATE_MAKE_OPT(nb);
- p[3] = DEFLATE_CHK_SEQUENCE;
- } else {
- newret = CONFREJ;
}
}
break;
ho->bsd_compress = 1;
ho->bsd_bits = nb = BSD_NBITS(p[2]);
if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
- || nb > ao->bsd_bits) {
+ || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
newret = CONFNAK;
- nb = ao->bsd_bits;
- } else {
- /*
- * 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.
- */
+ 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 (;;) {
- if (nb < BSD_MIN_BITS) {
+ 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;
}
- p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
- res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
- if (res != 0) {
- if (res < 0)
- newret = CONFREJ;
- break;
- }
newret = CONFNAK;
--nb;
- }
- }
- if (newret == CONFNAK && !dont_nak) {
- if (nb >= BSD_MIN_BITS) {
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
- } else {
- newret = CONFREJ;
}
}
break;
}
ho->predictor_1 = 1;
- if (ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
+ if (p == p0
+ && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
newret = CONFREJ;
}
break;
}
ho->predictor_2 = 1;
- if (ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
+ if (p == p0
+ && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
newret = CONFREJ;
}
break;
}
/*
- * CCP has come up - inform the kernel driver.
+ * Make a string name for a compression method (or 2).
+ */
+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)
{
ccp_options *go = &ccp_gotoptions[f->unit];
ccp_options *ho = &ccp_hisoptions[f->unit];
+ char method1[64];
ccp_flags_set(f->unit, 1, 1);
- if (ANY_COMPRESS(*go) || ANY_COMPRESS(*ho))
- syslog(LOG_NOTICE, "%s enabled",
- ANY_COMPRESS(*go)? ANY_COMPRESS(*ho)? "Compression":
- "Receive compression": "Transmit compression");
+ 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));
}
/*
/*
* 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;
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 */
* Disable compression by taking CCP down.
*/
syslog(LOG_ERR, "Lost compression sync: disabling compression");
- ccp_close(unit);
+ ccp_close(unit, "Lost compression sync");
} else {
/*
* Send a reset-request to reset the peer's compressor.
projects / ppp.git / blobdiff