summaryrefslogtreecommitdiffstats
path: root/mdk-stage1/ppp/pppd/ccp.c
diff options
context:
space:
mode:
Diffstat (limited to 'mdk-stage1/ppp/pppd/ccp.c')
-rw-r--r--mdk-stage1/ppp/pppd/ccp.c1257
1 files changed, 0 insertions, 1257 deletions
diff --git a/mdk-stage1/ppp/pppd/ccp.c b/mdk-stage1/ppp/pppd/ccp.c
deleted file mode 100644
index 7e36e384e..000000000
--- a/mdk-stage1/ppp/pppd/ccp.c
+++ /dev/null
@@ -1,1257 +0,0 @@
-/*
- * ccp.c - PPP Compression Control Protocol.
- *
- * Copyright (c) 1994 The Australian National University.
- * All rights reserved.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation is hereby granted, provided that the above copyright
- * notice appears in all copies. This software is provided without any
- * warranty, express or implied. The Australian National University
- * makes no representations about the suitability of this software for
- * any purpose.
- *
- * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
- * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
- * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
- * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
- * OR MODIFICATIONS.
- */
-
-#define RCSID "$Id$"
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "pppd.h"
-#include "fsm.h"
-#include "ccp.h"
-#include <net/ppp-comp.h>
-
-static const char rcsid[] = RCSID;
-
-/*
- * Unfortunately there is a bug in zlib which means that using a
- * size of 8 (window size = 256) for Deflate compression will cause
- * buffer overruns and kernel crashes in the deflate module.
- * Until this is fixed we only accept sizes in the range 9 .. 15.
- * Thanks to James Carlson for pointing this out.
- */
-#define DEFLATE_MIN_WORKS 9
-
-/*
- * Command-line options.
- */
-static int setbsdcomp __P((char **));
-static int setdeflate __P((char **));
-static char bsd_value[8];
-static char deflate_value[8];
-
-static option_t ccp_option_list[] = {
- { "noccp", o_bool, &ccp_protent.enabled_flag,
- "Disable CCP negotiation" },
- { "-ccp", o_bool, &ccp_protent.enabled_flag,
- "Disable CCP negotiation", OPT_ALIAS },
-
- { "bsdcomp", o_special, (void *)setbsdcomp,
- "Request BSD-Compress packet compression",
- OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
- { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
- "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].bsd_compress },
- { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
- "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].bsd_compress },
-
- { "deflate", o_special, (void *)setdeflate,
- "request Deflate compression",
- OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
- { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
- "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].deflate },
- { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
- "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].deflate },
-
- { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
- "don't use draft deflate #", OPT_A2COPY,
- &ccp_allowoptions[0].deflate_draft },
-
- { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
- "request Predictor-1", 1, &ccp_allowoptions[0].predictor_1, OPT_PRIO },
- { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
- "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].predictor_1 },
- { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
- "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
- &ccp_allowoptions[0].predictor_1 },
-
- { NULL }
-};
-
-/*
- * 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",
- "Compressed",
- ccp_option_list,
- 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 __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((void *));
-static char *method_name __P((ccp_options *, ccp_options *));
-
-static fsm_callbacks ccp_callbacks = {
- ccp_resetci,
- ccp_cilen,
- ccp_addci,
- ccp_ackci,
- ccp_nakci,
- ccp_rejci,
- ccp_reqci,
- ccp_up,
- ccp_down,
- NULL,
- NULL,
- NULL,
- NULL,
- ccp_extcode,
- "CCP"
-};
-
-/*
- * Do we want / did we get any compression?
- */
-#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).
- */
-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 */
-
-/*
- * Option parsing.
- */
-static int
-setbsdcomp(argv)
- char **argv;
-{
- int rbits, abits;
- char *str, *endp;
-
- str = *argv;
- abits = rbits = strtol(str, &endp, 0);
- if (endp != str && *endp == ',') {
- str = endp + 1;
- abits = strtol(str, &endp, 0);
- }
- if (*endp != 0 || endp == str) {
- option_error("invalid parameter '%s' for bsdcomp option", *argv);
- return 0;
- }
- if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
- || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
- option_error("bsdcomp option values must be 0 or %d .. %d",
- BSD_MIN_BITS, BSD_MAX_BITS);
- return 0;
- }
- if (rbits > 0) {
- ccp_wantoptions[0].bsd_compress = 1;
- ccp_wantoptions[0].bsd_bits = rbits;
- } else
- ccp_wantoptions[0].bsd_compress = 0;
- if (abits > 0) {
- ccp_allowoptions[0].bsd_compress = 1;
- ccp_allowoptions[0].bsd_bits = abits;
- } else
- ccp_allowoptions[0].bsd_compress = 0;
- slprintf(bsd_value, sizeof(bsd_value),
- rbits == abits? "%d": "%d,%d", rbits, abits);
-
- return 1;
-}
-
-static int
-setdeflate(argv)
- char **argv;
-{
- int rbits, abits;
- char *str, *endp;
-
- str = *argv;
- abits = rbits = strtol(str, &endp, 0);
- if (endp != str && *endp == ',') {
- str = endp + 1;
- abits = strtol(str, &endp, 0);
- }
- if (*endp != 0 || endp == str) {
- option_error("invalid parameter '%s' for deflate option", *argv);
- return 0;
- }
- if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
- || (abits != 0 && (abits < DEFLATE_MIN_SIZE
- || abits > DEFLATE_MAX_SIZE))) {
- option_error("deflate option values must be 0 or %d .. %d",
- DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
- return 0;
- }
- if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
- if (rbits == DEFLATE_MIN_SIZE)
- rbits = DEFLATE_MIN_WORKS;
- if (abits == DEFLATE_MIN_SIZE)
- abits = DEFLATE_MIN_WORKS;
- warn("deflate option value of %d changed to %d to avoid zlib bug",
- DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
- }
- if (rbits > 0) {
- ccp_wantoptions[0].deflate = 1;
- ccp_wantoptions[0].deflate_size = rbits;
- } else
- ccp_wantoptions[0].deflate = 0;
- if (abits > 0) {
- ccp_allowoptions[0].deflate = 1;
- ccp_allowoptions[0].deflate_size = abits;
- } else
- ccp_allowoptions[0].deflate = 0;
- slprintf(deflate_value, sizeof(deflate_value),
- rbits == abits? "%d": "%d,%d", rbits, abits);
-
- return 1;
-}
-
-/*
- * ccp_init - initialize CCP.
- */
-static void
-ccp_init(unit)
- int unit;
-{
- fsm *f = &ccp_fsm[unit];
-
- f->unit = unit;
- f->protocol = PPP_CCP;
- f->callbacks = &ccp_callbacks;
- fsm_init(f);
-
- memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
- memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
- memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
- memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
-
- ccp_wantoptions[0].deflate = 1;
- ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
- ccp_wantoptions[0].deflate_correct = 1;
- ccp_wantoptions[0].deflate_draft = 1;
- ccp_allowoptions[0].deflate = 1;
- ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
- ccp_allowoptions[0].deflate_correct = 1;
- ccp_allowoptions[0].deflate_draft = 1;
-
- 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;
-}
-
-/*
- * ccp_open - CCP is allowed to come up.
- */
-static void
-ccp_open(unit)
- int unit;
-{
- fsm *f = &ccp_fsm[unit];
-
- if (f->state != OPENED)
- ccp_flags_set(unit, 1, 0);
-
- /*
- * 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.
- */
-static void
-ccp_close(unit, reason)
- int unit;
- char *reason;
-{
- ccp_flags_set(unit, 0, 0);
- fsm_close(&ccp_fsm[unit], reason);
-}
-
-/*
- * ccp_lowerup - we may now transmit CCP packets.
- */
-static void
-ccp_lowerup(unit)
- int unit;
-{
- fsm_lowerup(&ccp_fsm[unit]);
-}
-
-/*
- * ccp_lowerdown - we may not transmit CCP packets.
- */
-static void
-ccp_lowerdown(unit)
- int unit;
-{
- fsm_lowerdown(&ccp_fsm[unit]);
-}
-
-/*
- * ccp_input - process a received CCP packet.
- */
-static void
-ccp_input(unit, p, len)
- int unit;
- u_char *p;
- int 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)
- 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");
-}
-
-/*
- * Handle a CCP-specific code.
- */
-static int
-ccp_extcode(f, code, id, p, len)
- fsm *f;
- int code, id;
- u_char *p;
- int len;
-{
- switch (code) {
- 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, CCP_RESETACK, id, NULL, 0);
- break;
-
- 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, f);
- }
- break;
-
- default:
- return 0;
- }
-
- return 1;
-}
-
-/*
- * ccp_protrej - peer doesn't talk CCP.
- */
-static void
-ccp_protrej(unit)
- int unit;
-{
- ccp_flags_set(unit, 0, 0);
- fsm_lowerdown(&ccp_fsm[unit]);
-}
-
-/*
- * ccp_resetci - initialize at start of negotiation.
- */
-static void
-ccp_resetci(f)
- fsm *f;
-{
- ccp_options *go = &ccp_gotoptions[f->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_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) {
- if (go->deflate_correct) {
- opt_buf[0] = CI_DEFLATE;
- opt_buf[1] = CILEN_DEFLATE;
- opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
- opt_buf[3] = DEFLATE_CHK_SEQUENCE;
- if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
- go->deflate_correct = 0;
- }
- if (go->deflate_draft) {
- opt_buf[0] = CI_DEFLATE_DRAFT;
- opt_buf[1] = CILEN_DEFLATE;
- opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
- opt_buf[3] = DEFLATE_CHK_SEQUENCE;
- if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
- go->deflate_draft = 0;
- }
- if (!go->deflate_correct && !go->deflate_draft)
- 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_cilen - Return total length of our configuration info.
- */
-static int
-ccp_cilen(f)
- fsm *f;
-{
- ccp_options *go = &ccp_gotoptions[f->unit];
-
- 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);
-}
-
-/*
- * ccp_addci - put our requests in a packet.
- */
-static void
-ccp_addci(f, p, lenp)
- fsm *f;
- 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] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
- 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_WORKS) {
- go->deflate = 0;
- break;
- }
- --go->deflate_size;
- p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
- }
- if (p != p0 && go->deflate_correct && go->deflate_draft) {
- p[0] = CI_DEFLATE_DRAFT;
- p[1] = CILEN_DEFLATE;
- p[2] = p[2 - CILEN_DEFLATE];
- p[3] = DEFLATE_CHK_SEQUENCE;
- p += CILEN_DEFLATE;
- }
- }
- if (go->bsd_compress) {
- p[0] = CI_BSD_COMPRESS;
- 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;
-}
-
-/*
- * ccp_ackci - process a received configure-ack, and return
- * 1 iff the packet was OK.
- */
-static int
-ccp_ackci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
-{
- ccp_options *go = &ccp_gotoptions[f->unit];
- u_char *p0 = p;
-
- if (go->deflate) {
- if (len < CILEN_DEFLATE
- || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
- || 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->deflate_correct && go->deflate_draft) {
- if (len < CILEN_DEFLATE
- || p[0] != CI_DEFLATE_DRAFT
- || 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;
- }
- }
- if (go->bsd_compress) {
- 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 += 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;
-}
-
-/*
- * ccp_nakci - process received configure-nak.
- * Returns 1 iff the nak was OK.
- */
-static int
-ccp_nakci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
-{
- ccp_options *go = &ccp_gotoptions[f->unit];
- ccp_options no; /* options we've seen already */
- ccp_options try; /* options to ask for next time */
-
- memset(&no, 0, sizeof(no));
- try = *go;
-
- if (go->deflate && len >= CILEN_DEFLATE
- && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
- && 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_WORKS
- || p[3] != DEFLATE_CHK_SEQUENCE)
- try.deflate = 0;
- else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
- try.deflate_size = DEFLATE_SIZE(p[2]);
- p += CILEN_DEFLATE;
- len -= CILEN_DEFLATE;
- if (go->deflate_correct && go->deflate_draft
- && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
- && p[1] == CILEN_DEFLATE) {
- 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
- * or a different version.
- */
- 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;
- }
-
- /*
- * Predictor-1 and 2 have no options, so they can't be Naked.
- *
- * There may be remaining options but we ignore them.
- */
-
- if (f->state != OPENED)
- *go = try;
- return 1;
-}
-
-/*
- * ccp_rejci - reject some of our suggested compression methods.
- */
-static int
-ccp_rejci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
-{
- ccp_options *go = &ccp_gotoptions[f->unit];
- ccp_options try; /* options to request next time */
-
- try = *go;
-
- /*
- * 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] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
- && p[1] == CILEN_DEFLATE) {
- if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
- || p[3] != DEFLATE_CHK_SEQUENCE)
- return 0; /* Rej is bad */
- if (go->deflate_correct)
- try.deflate_correct = 0;
- else
- try.deflate_draft = 0;
- p += CILEN_DEFLATE;
- len -= CILEN_DEFLATE;
- if (go->deflate_correct && go->deflate_draft
- && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
- && 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_draft = 0;
- p += CILEN_DEFLATE;
- len -= CILEN_DEFLATE;
- }
- if (!try.deflate_correct && !try.deflate_draft)
- try.deflate = 0;
- }
- 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_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)
- return 0;
-
- if (f->state != OPENED)
- *go = try;
-
- return 1;
-}
-
-/*
- * ccp_reqci - processed a received configure-request.
- * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
- * appropriately.
- */
-static int
-ccp_reqci(f, p, lenp, dont_nak)
- fsm *f;
- u_char *p;
- int *lenp;
- int dont_nak;
-{
- int ret, newret, res;
- u_char *p0, *retp;
- int len, clen, type, nb;
- ccp_options *ho = &ccp_hisoptions[f->unit];
- ccp_options *ao = &ccp_allowoptions[f->unit];
-
- ret = CONFACK;
- retp = p0 = p;
- len = *lenp;
-
- memset(ho, 0, sizeof(ccp_options));
- ho->method = (len > 0)? p[0]: -1;
-
- while (len > 0) {
- newret = CONFACK;
- if (len < 2 || p[1] < 2 || p[1] > len) {
- /* length is bad */
- clen = len;
- newret = CONFREJ;
-
- } else {
- type = p[0];
- clen = p[1];
-
- switch (type) {
- case CI_DEFLATE:
- case CI_DEFLATE_DRAFT:
- if (!ao->deflate || clen != CILEN_DEFLATE
- || (!ao->deflate_correct && type == CI_DEFLATE)
- || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
- 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_WORKS) {
- newret = CONFNAK;
- if (!dont_nak) {
- p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
- p[3] = DEFLATE_CHK_SEQUENCE;
- /* fall through to test this #bits below */
- } else
- 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_WORKS || 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_COMPRESS) {
- 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 < BSD_MIN_BITS) {
- newret = CONFNAK;
- if (!dont_nak) {
- p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
- /* fall through to test this #bits below */
- } else
- 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;
- --nb;
- p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
- }
- }
- 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:
- newret = CONFREJ;
- }
- }
-
- 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);
- retp += clen;
- }
-
- p += clen;
- len -= clen;
- }
-
- if (ret != CONFACK) {
- if (ret == CONFREJ && *lenp == retp - p0)
- all_rejected[f->unit] = 1;
- else
- *lenp = retp - p0;
- }
- return ret;
-}
-
-/*
- * 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:
- case CI_DEFLATE_DRAFT:
- if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
- slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
- (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
- opt->deflate_size, opt2->deflate_size);
- else
- slprintf(result, sizeof(result), "Deflate%s (%d)",
- (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
- opt->deflate_size);
- break;
- case CI_BSD_COMPRESS:
- if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
- slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
- opt->bsd_bits, opt2->bsd_bits);
- else
- slprintf(result, sizeof(result), "BSD-Compress (%d)",
- opt->bsd_bits);
- break;
- case CI_PREDICTOR_1:
- return "Predictor 1";
- case CI_PREDICTOR_2:
- return "Predictor 2";
- default:
- slprintf(result, sizeof(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);
- if (ANY_COMPRESS(*go)) {
- if (ANY_COMPRESS(*ho)) {
- if (go->method == ho->method) {
- notice("%s compression enabled", method_name(go, ho));
- } else {
- strlcpy(method1, method_name(go, NULL), sizeof(method1));
- notice("%s / %s compression enabled",
- method1, method_name(ho, NULL));
- }
- } else
- notice("%s receive compression enabled", method_name(go, NULL));
- } else if (ANY_COMPRESS(*ho))
- notice("%s transmit compression enabled", method_name(ho, NULL));
-}
-
-/*
- * CCP has gone down - inform the kernel driver.
- */
-static void
-ccp_down(f)
- fsm *f;
-{
- if (ccp_localstate[f->unit] & RACK_PENDING)
- UNTIMEOUT(ccp_rack_timeout, f);
- ccp_localstate[f->unit] = 0;
- ccp_flags_set(f->unit, 1, 0);
-}
-
-/*
- * Print the contents of a CCP packet.
- */
-static char *ccp_codenames[] = {
- "ConfReq", "ConfAck", "ConfNak", "ConfRej",
- "TermReq", "TermAck", "CodeRej",
- NULL, NULL, NULL, NULL, NULL, NULL,
- "ResetReq", "ResetAck",
-};
-
-static int
-ccp_printpkt(p, plen, printer, arg)
- u_char *p;
- int plen;
- void (*printer) __P((void *, char *, ...));
- void *arg;
-{
- u_char *p0, *optend;
- int code, id, len;
- int optlen;
-
- p0 = p;
- if (plen < HEADERLEN)
- return 0;
- code = p[0];
- id = p[1];
- len = (p[2] << 8) + p[3];
- if (len < HEADERLEN || len > plen)
- return 0;
-
- if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
- && ccp_codenames[code-1] != NULL)
- printer(arg, " %s", ccp_codenames[code-1]);
- else
- printer(arg, " code=0x%x", code);
- printer(arg, " id=0x%x", id);
- len -= HEADERLEN;
- p += HEADERLEN;
-
- switch (code) {
- case CONFREQ:
- case CONFACK:
- case CONFNAK:
- case CONFREJ:
- /* print list of possible compression methods */
- while (len >= 2) {
- code = p[0];
- optlen = p[1];
- if (optlen < 2 || optlen > len)
- break;
- printer(arg, " <");
- len -= optlen;
- optend = p + optlen;
- switch (code) {
- case CI_DEFLATE:
- case CI_DEFLATE_DRAFT:
- if (optlen >= CILEN_DEFLATE) {
- printer(arg, "deflate%s %d",
- (code == CI_DEFLATE_DRAFT? "(old#)": ""),
- 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_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;
- }
- while (p < optend)
- printer(arg, " %.2x", *p++);
- printer(arg, ">");
- }
- break;
-
- case TERMACK:
- case TERMREQ:
- if (len > 0 && *p >= ' ' && *p < 0x7f) {
- print_string((char *)p, len, printer, arg);
- p += len;
- len = 0;
- }
- break;
- }
-
- /* dump out the rest of the packet in hex */
- while (--len >= 0)
- printer(arg, " %.2x", *p++);
-
- return p - p0;
-}
-
-/*
- * 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 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.
- */
-static void
-ccp_datainput(unit, pkt, len)
- int unit;
- u_char *pkt;
- int len;
-{
- fsm *f;
-
- f = &ccp_fsm[unit];
- if (f->state == OPENED) {
- if (ccp_fatal_error(unit)) {
- /*
- * Disable compression by taking CCP down.
- */
- error("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, f, RACKTIMEOUT);
- ccp_localstate[f->unit] |= RACK_PENDING;
- } else
- ccp_localstate[f->unit] |= RREQ_REPEAT;
- }
- }
-}
-
-/*
- * Timeout waiting for reset-ack.
- */
-static void
-ccp_rack_timeout(arg)
- void *arg;
-{
- fsm *f = arg;
-
- if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
- fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
- TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
- ccp_localstate[f->unit] &= ~RREQ_REPEAT;
- } else
- ccp_localstate[f->unit] &= ~RACK_PENDING;
-}
-
generated by cgit v1.2.1 (git 2.21.0) at 2024-05-01 00:10:34 +0000