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author | Mystery Man <unknown@mandriva.org> | 2002-07-18 10:15:29 +0000 |
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committer | Mystery Man <unknown@mandriva.org> | 2002-07-18 10:15:29 +0000 |
commit | 700529a81000e551676a591369fc7c9ea13a1a33 (patch) | |
tree | cf19449afbd0ef4f2b12faffa7657a38ab578b99 /mdk-stage1/ppp/pppd/ccp.c | |
parent | 1f295b1f8bfe64f293a79900161b085a37009dee (diff) | |
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This commit was manufactured by cvs2svn to create tag 'V1_1_8_6mdk'.V1_1_8_6mdk
Diffstat (limited to 'mdk-stage1/ppp/pppd/ccp.c')
-rw-r--r-- | mdk-stage1/ppp/pppd/ccp.c | 1257 |
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; -} - |