[457] | 1 | /*
|
---|
| 2 | * ccp.c - PPP Compression Control Protocol.
|
---|
| 3 | *
|
---|
| 4 | * Copyright (c) 1994-2002 Paul Mackerras. All rights reserved.
|
---|
| 5 | *
|
---|
| 6 | * Redistribution and use in source and binary forms, with or without
|
---|
| 7 | * modification, are permitted provided that the following conditions
|
---|
| 8 | * are met:
|
---|
| 9 | *
|
---|
| 10 | * 1. Redistributions of source code must retain the above copyright
|
---|
| 11 | * notice, this list of conditions and the following disclaimer.
|
---|
| 12 | *
|
---|
| 13 | * 2. The name(s) of the authors of this software must not be used to
|
---|
| 14 | * endorse or promote products derived from this software without
|
---|
| 15 | * prior written permission.
|
---|
| 16 | *
|
---|
| 17 | * 3. Redistributions of any form whatsoever must retain the following
|
---|
| 18 | * acknowledgment:
|
---|
| 19 | * "This product includes software developed by Paul Mackerras
|
---|
| 20 | * <paulus@samba.org>".
|
---|
| 21 | *
|
---|
| 22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
|
---|
| 23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
---|
| 24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
|
---|
| 25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
---|
| 26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
|
---|
| 27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
|
---|
| 28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
---|
| 29 | */
|
---|
| 30 |
|
---|
| 31 | #include "netif/ppp/ppp_opts.h"
|
---|
| 32 | #if PPP_SUPPORT && CCP_SUPPORT /* don't build if not configured for use in lwipopts.h */
|
---|
| 33 |
|
---|
| 34 | #include <stdlib.h>
|
---|
| 35 | #include <string.h>
|
---|
| 36 |
|
---|
| 37 | #include "netif/ppp/ppp_impl.h"
|
---|
| 38 |
|
---|
| 39 | #include "netif/ppp/fsm.h"
|
---|
| 40 | #include "netif/ppp/ccp.h"
|
---|
| 41 |
|
---|
| 42 | #if MPPE_SUPPORT
|
---|
| 43 | #include "netif/ppp/lcp.h" /* lcp_close(), lcp_fsm */
|
---|
| 44 | #include "netif/ppp/mppe.h" /* mppe_init() */
|
---|
| 45 | #endif /* MPPE_SUPPORT */
|
---|
| 46 |
|
---|
| 47 | /*
|
---|
| 48 | * Unfortunately there is a bug in zlib which means that using a
|
---|
| 49 | * size of 8 (window size = 256) for Deflate compression will cause
|
---|
| 50 | * buffer overruns and kernel crashes in the deflate module.
|
---|
| 51 | * Until this is fixed we only accept sizes in the range 9 .. 15.
|
---|
| 52 | * Thanks to James Carlson for pointing this out.
|
---|
| 53 | */
|
---|
| 54 | #define DEFLATE_MIN_WORKS 9
|
---|
| 55 |
|
---|
| 56 | /*
|
---|
| 57 | * Command-line options.
|
---|
| 58 | */
|
---|
| 59 | #if PPP_OPTIONS
|
---|
| 60 | static int setbsdcomp (char **);
|
---|
| 61 | static int setdeflate (char **);
|
---|
| 62 | static char bsd_value[8];
|
---|
| 63 | static char deflate_value[8];
|
---|
| 64 |
|
---|
| 65 | /*
|
---|
| 66 | * Option variables.
|
---|
| 67 | */
|
---|
| 68 | #if MPPE_SUPPORT
|
---|
| 69 | bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
|
---|
| 70 | #endif /* MPPE_SUPPORT */
|
---|
| 71 |
|
---|
| 72 | static option_t ccp_option_list[] = {
|
---|
| 73 | { "noccp", o_bool, &ccp_protent.enabled_flag,
|
---|
| 74 | "Disable CCP negotiation" },
|
---|
| 75 | { "-ccp", o_bool, &ccp_protent.enabled_flag,
|
---|
| 76 | "Disable CCP negotiation", OPT_ALIAS },
|
---|
| 77 |
|
---|
| 78 | { "bsdcomp", o_special, (void *)setbsdcomp,
|
---|
| 79 | "Request BSD-Compress packet compression",
|
---|
| 80 | OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
|
---|
| 81 | { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
|
---|
| 82 | "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 83 | &ccp_allowoptions[0].bsd_compress },
|
---|
| 84 | { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
|
---|
| 85 | "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 86 | &ccp_allowoptions[0].bsd_compress },
|
---|
| 87 |
|
---|
| 88 | { "deflate", o_special, (void *)setdeflate,
|
---|
| 89 | "request Deflate compression",
|
---|
| 90 | OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
|
---|
| 91 | { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
|
---|
| 92 | "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 93 | &ccp_allowoptions[0].deflate },
|
---|
| 94 | { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
|
---|
| 95 | "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 96 | &ccp_allowoptions[0].deflate },
|
---|
| 97 |
|
---|
| 98 | { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
|
---|
| 99 | "don't use draft deflate #", OPT_A2COPY,
|
---|
| 100 | &ccp_allowoptions[0].deflate_draft },
|
---|
| 101 |
|
---|
| 102 | { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
|
---|
| 103 | "request Predictor-1", OPT_PRIO | 1 },
|
---|
| 104 | { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
|
---|
| 105 | "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 106 | &ccp_allowoptions[0].predictor_1 },
|
---|
| 107 | { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
|
---|
| 108 | "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
|
---|
| 109 | &ccp_allowoptions[0].predictor_1 },
|
---|
| 110 |
|
---|
| 111 | #if MPPE_SUPPORT
|
---|
| 112 | /* MPPE options are symmetrical ... we only set wantoptions here */
|
---|
| 113 | { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
|
---|
| 114 | "require MPPE encryption",
|
---|
| 115 | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
|
---|
| 116 | { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
|
---|
| 117 | "require MPPE encryption",
|
---|
| 118 | OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
|
---|
| 119 | { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
|
---|
| 120 | "don't allow MPPE encryption", OPT_PRIO },
|
---|
| 121 | { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
|
---|
| 122 | "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
|
---|
| 123 |
|
---|
| 124 | /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
|
---|
| 125 | { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 126 | "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
|
---|
| 127 | &ccp_wantoptions[0].mppe },
|
---|
| 128 | { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 129 | "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
|
---|
| 130 | &ccp_wantoptions[0].mppe },
|
---|
| 131 | { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 132 | "don't allow MPPE 40-bit encryption",
|
---|
| 133 | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
|
---|
| 134 | { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 135 | "don't allow MPPE 40-bit encryption",
|
---|
| 136 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
|
---|
| 137 | &ccp_wantoptions[0].mppe },
|
---|
| 138 |
|
---|
| 139 | { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 140 | "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
|
---|
| 141 | &ccp_wantoptions[0].mppe },
|
---|
| 142 | { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 143 | "require MPPE 128-bit encryption",
|
---|
| 144 | OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
|
---|
| 145 | &ccp_wantoptions[0].mppe },
|
---|
| 146 | { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 147 | "don't allow MPPE 128-bit encryption",
|
---|
| 148 | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
|
---|
| 149 | { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
|
---|
| 150 | "don't allow MPPE 128-bit encryption",
|
---|
| 151 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
|
---|
| 152 | &ccp_wantoptions[0].mppe },
|
---|
| 153 |
|
---|
| 154 | /* strange one; we always request stateless, but will we allow stateful? */
|
---|
| 155 | { "mppe-stateful", o_bool, &refuse_mppe_stateful,
|
---|
| 156 | "allow MPPE stateful mode", OPT_PRIO },
|
---|
| 157 | { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
|
---|
| 158 | "disallow MPPE stateful mode", OPT_PRIO | 1 },
|
---|
| 159 | #endif /* MPPE_SUPPORT */
|
---|
| 160 |
|
---|
| 161 | { NULL }
|
---|
| 162 | };
|
---|
| 163 | #endif /* PPP_OPTIONS */
|
---|
| 164 |
|
---|
| 165 | /*
|
---|
| 166 | * Protocol entry points from main code.
|
---|
| 167 | */
|
---|
| 168 | static void ccp_init(ppp_pcb *pcb);
|
---|
| 169 | static void ccp_open(ppp_pcb *pcb);
|
---|
| 170 | static void ccp_close(ppp_pcb *pcb, const char *reason);
|
---|
| 171 | static void ccp_lowerup(ppp_pcb *pcb);
|
---|
| 172 | static void ccp_lowerdown(ppp_pcb *pcb);
|
---|
| 173 | static void ccp_input(ppp_pcb *pcb, u_char *pkt, int len);
|
---|
| 174 | static void ccp_protrej(ppp_pcb *pcb);
|
---|
| 175 | #if PRINTPKT_SUPPORT
|
---|
| 176 | static int ccp_printpkt(const u_char *p, int plen, void (*printer) (void *, const char *, ...), void *arg);
|
---|
| 177 | #endif /* PRINTPKT_SUPPORT */
|
---|
| 178 | #if PPP_DATAINPUT
|
---|
| 179 | static void ccp_datainput(ppp_pcb *pcb, u_char *pkt, int len);
|
---|
| 180 | #endif /* PPP_DATAINPUT */
|
---|
| 181 |
|
---|
| 182 | const struct protent ccp_protent = {
|
---|
| 183 | PPP_CCP,
|
---|
| 184 | ccp_init,
|
---|
| 185 | ccp_input,
|
---|
| 186 | ccp_protrej,
|
---|
| 187 | ccp_lowerup,
|
---|
| 188 | ccp_lowerdown,
|
---|
| 189 | ccp_open,
|
---|
| 190 | ccp_close,
|
---|
| 191 | #if PRINTPKT_SUPPORT
|
---|
| 192 | ccp_printpkt,
|
---|
| 193 | #endif /* PRINTPKT_SUPPORT */
|
---|
| 194 | #if PPP_DATAINPUT
|
---|
| 195 | ccp_datainput,
|
---|
| 196 | #endif /* PPP_DATAINPUT */
|
---|
| 197 | #if PRINTPKT_SUPPORT
|
---|
| 198 | "CCP",
|
---|
| 199 | "Compressed",
|
---|
| 200 | #endif /* PRINTPKT_SUPPORT */
|
---|
| 201 | #if PPP_OPTIONS
|
---|
| 202 | ccp_option_list,
|
---|
| 203 | NULL,
|
---|
| 204 | #endif /* PPP_OPTIONS */
|
---|
| 205 | #if DEMAND_SUPPORT
|
---|
| 206 | NULL,
|
---|
| 207 | NULL
|
---|
| 208 | #endif /* DEMAND_SUPPORT */
|
---|
| 209 | };
|
---|
| 210 |
|
---|
| 211 | /*
|
---|
| 212 | * Callbacks for fsm code.
|
---|
| 213 | */
|
---|
| 214 | static void ccp_resetci (fsm *);
|
---|
| 215 | static int ccp_cilen (fsm *);
|
---|
| 216 | static void ccp_addci (fsm *, u_char *, int *);
|
---|
| 217 | static int ccp_ackci (fsm *, u_char *, int);
|
---|
| 218 | static int ccp_nakci (fsm *, u_char *, int, int);
|
---|
| 219 | static int ccp_rejci (fsm *, u_char *, int);
|
---|
| 220 | static int ccp_reqci (fsm *, u_char *, int *, int);
|
---|
| 221 | static void ccp_up (fsm *);
|
---|
| 222 | static void ccp_down (fsm *);
|
---|
| 223 | static int ccp_extcode (fsm *, int, int, u_char *, int);
|
---|
| 224 | static void ccp_rack_timeout (void *);
|
---|
| 225 | static const char *method_name (ccp_options *, ccp_options *);
|
---|
| 226 |
|
---|
| 227 | static const fsm_callbacks ccp_callbacks = {
|
---|
| 228 | ccp_resetci,
|
---|
| 229 | ccp_cilen,
|
---|
| 230 | ccp_addci,
|
---|
| 231 | ccp_ackci,
|
---|
| 232 | ccp_nakci,
|
---|
| 233 | ccp_rejci,
|
---|
| 234 | ccp_reqci,
|
---|
| 235 | ccp_up,
|
---|
| 236 | ccp_down,
|
---|
| 237 | NULL,
|
---|
| 238 | NULL,
|
---|
| 239 | NULL,
|
---|
| 240 | NULL,
|
---|
| 241 | ccp_extcode,
|
---|
| 242 | "CCP"
|
---|
| 243 | };
|
---|
| 244 |
|
---|
| 245 | /*
|
---|
| 246 | * Do we want / did we get any compression?
|
---|
| 247 | */
|
---|
| 248 | static int ccp_anycompress(ccp_options *opt) {
|
---|
| 249 | return (0
|
---|
| 250 | #if DEFLATE_SUPPORT
|
---|
| 251 | || (opt)->deflate
|
---|
| 252 | #endif /* DEFLATE_SUPPORT */
|
---|
| 253 | #if BSDCOMPRESS_SUPPORT
|
---|
| 254 | || (opt)->bsd_compress
|
---|
| 255 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 256 | #if PREDICTOR_SUPPORT
|
---|
| 257 | || (opt)->predictor_1 || (opt)->predictor_2
|
---|
| 258 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 259 | #if MPPE_SUPPORT
|
---|
| 260 | || (opt)->mppe
|
---|
| 261 | #endif /* MPPE_SUPPORT */
|
---|
| 262 | );
|
---|
| 263 | }
|
---|
| 264 |
|
---|
| 265 | /*
|
---|
| 266 | * Local state (mainly for handling reset-reqs and reset-acks).
|
---|
| 267 | */
|
---|
| 268 | #define RACK_PENDING 1 /* waiting for reset-ack */
|
---|
| 269 | #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
|
---|
| 270 |
|
---|
| 271 | #define RACKTIMEOUT 1 /* second */
|
---|
| 272 |
|
---|
| 273 | #if PPP_OPTIONS
|
---|
| 274 | /*
|
---|
| 275 | * Option parsing
|
---|
| 276 | */
|
---|
| 277 | static int
|
---|
| 278 | setbsdcomp(argv)
|
---|
| 279 | char **argv;
|
---|
| 280 | {
|
---|
| 281 | int rbits, abits;
|
---|
| 282 | char *str, *endp;
|
---|
| 283 |
|
---|
| 284 | str = *argv;
|
---|
| 285 | abits = rbits = strtol(str, &endp, 0);
|
---|
| 286 | if (endp != str && *endp == ',') {
|
---|
| 287 | str = endp + 1;
|
---|
| 288 | abits = strtol(str, &endp, 0);
|
---|
| 289 | }
|
---|
| 290 | if (*endp != 0 || endp == str) {
|
---|
| 291 | option_error("invalid parameter '%s' for bsdcomp option", *argv);
|
---|
| 292 | return 0;
|
---|
| 293 | }
|
---|
| 294 | if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
|
---|
| 295 | || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
|
---|
| 296 | option_error("bsdcomp option values must be 0 or %d .. %d",
|
---|
| 297 | BSD_MIN_BITS, BSD_MAX_BITS);
|
---|
| 298 | return 0;
|
---|
| 299 | }
|
---|
| 300 | if (rbits > 0) {
|
---|
| 301 | ccp_wantoptions[0].bsd_compress = 1;
|
---|
| 302 | ccp_wantoptions[0].bsd_bits = rbits;
|
---|
| 303 | } else
|
---|
| 304 | ccp_wantoptions[0].bsd_compress = 0;
|
---|
| 305 | if (abits > 0) {
|
---|
| 306 | ccp_allowoptions[0].bsd_compress = 1;
|
---|
| 307 | ccp_allowoptions[0].bsd_bits = abits;
|
---|
| 308 | } else
|
---|
| 309 | ccp_allowoptions[0].bsd_compress = 0;
|
---|
| 310 | ppp_slprintf(bsd_value, sizeof(bsd_value),
|
---|
| 311 | rbits == abits? "%d": "%d,%d", rbits, abits);
|
---|
| 312 |
|
---|
| 313 | return 1;
|
---|
| 314 | }
|
---|
| 315 |
|
---|
| 316 | static int
|
---|
| 317 | setdeflate(argv)
|
---|
| 318 | char **argv;
|
---|
| 319 | {
|
---|
| 320 | int rbits, abits;
|
---|
| 321 | char *str, *endp;
|
---|
| 322 |
|
---|
| 323 | str = *argv;
|
---|
| 324 | abits = rbits = strtol(str, &endp, 0);
|
---|
| 325 | if (endp != str && *endp == ',') {
|
---|
| 326 | str = endp + 1;
|
---|
| 327 | abits = strtol(str, &endp, 0);
|
---|
| 328 | }
|
---|
| 329 | if (*endp != 0 || endp == str) {
|
---|
| 330 | option_error("invalid parameter '%s' for deflate option", *argv);
|
---|
| 331 | return 0;
|
---|
| 332 | }
|
---|
| 333 | if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
|
---|
| 334 | || (abits != 0 && (abits < DEFLATE_MIN_SIZE
|
---|
| 335 | || abits > DEFLATE_MAX_SIZE))) {
|
---|
| 336 | option_error("deflate option values must be 0 or %d .. %d",
|
---|
| 337 | DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
|
---|
| 338 | return 0;
|
---|
| 339 | }
|
---|
| 340 | if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
|
---|
| 341 | if (rbits == DEFLATE_MIN_SIZE)
|
---|
| 342 | rbits = DEFLATE_MIN_WORKS;
|
---|
| 343 | if (abits == DEFLATE_MIN_SIZE)
|
---|
| 344 | abits = DEFLATE_MIN_WORKS;
|
---|
| 345 | warn("deflate option value of %d changed to %d to avoid zlib bug",
|
---|
| 346 | DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
|
---|
| 347 | }
|
---|
| 348 | if (rbits > 0) {
|
---|
| 349 | ccp_wantoptions[0].deflate = 1;
|
---|
| 350 | ccp_wantoptions[0].deflate_size = rbits;
|
---|
| 351 | } else
|
---|
| 352 | ccp_wantoptions[0].deflate = 0;
|
---|
| 353 | if (abits > 0) {
|
---|
| 354 | ccp_allowoptions[0].deflate = 1;
|
---|
| 355 | ccp_allowoptions[0].deflate_size = abits;
|
---|
| 356 | } else
|
---|
| 357 | ccp_allowoptions[0].deflate = 0;
|
---|
| 358 | ppp_slprintf(deflate_value, sizeof(deflate_value),
|
---|
| 359 | rbits == abits? "%d": "%d,%d", rbits, abits);
|
---|
| 360 |
|
---|
| 361 | return 1;
|
---|
| 362 | }
|
---|
| 363 | #endif /* PPP_OPTIONS */
|
---|
| 364 |
|
---|
| 365 | /*
|
---|
| 366 | * ccp_init - initialize CCP.
|
---|
| 367 | */
|
---|
| 368 | static void ccp_init(ppp_pcb *pcb) {
|
---|
| 369 | fsm *f = &pcb->ccp_fsm;
|
---|
| 370 |
|
---|
| 371 | f->pcb = pcb;
|
---|
| 372 | f->protocol = PPP_CCP;
|
---|
| 373 | f->callbacks = &ccp_callbacks;
|
---|
| 374 | fsm_init(f);
|
---|
| 375 |
|
---|
| 376 | #if 0 /* Not necessary, everything is cleared in ppp_new() */
|
---|
| 377 | memset(wo, 0, sizeof(*wo));
|
---|
| 378 | memset(go, 0, sizeof(*go));
|
---|
| 379 | memset(ao, 0, sizeof(*ao));
|
---|
| 380 | memset(ho, 0, sizeof(*ho));
|
---|
| 381 | #endif /* 0 */
|
---|
| 382 |
|
---|
| 383 | #if DEFLATE_SUPPORT
|
---|
| 384 | wo->deflate = 1;
|
---|
| 385 | wo->deflate_size = DEFLATE_MAX_SIZE;
|
---|
| 386 | wo->deflate_correct = 1;
|
---|
| 387 | wo->deflate_draft = 1;
|
---|
| 388 | ao->deflate = 1;
|
---|
| 389 | ao->deflate_size = DEFLATE_MAX_SIZE;
|
---|
| 390 | ao->deflate_correct = 1;
|
---|
| 391 | ao->deflate_draft = 1;
|
---|
| 392 | #endif /* DEFLATE_SUPPORT */
|
---|
| 393 |
|
---|
| 394 | #if BSDCOMPRESS_SUPPORT
|
---|
| 395 | wo->bsd_compress = 1;
|
---|
| 396 | wo->bsd_bits = BSD_MAX_BITS;
|
---|
| 397 | ao->bsd_compress = 1;
|
---|
| 398 | ao->bsd_bits = BSD_MAX_BITS;
|
---|
| 399 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 400 |
|
---|
| 401 | #if PREDICTOR_SUPPORT
|
---|
| 402 | ao->predictor_1 = 1;
|
---|
| 403 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 404 | }
|
---|
| 405 |
|
---|
| 406 | /*
|
---|
| 407 | * ccp_open - CCP is allowed to come up.
|
---|
| 408 | */
|
---|
| 409 | static void ccp_open(ppp_pcb *pcb) {
|
---|
| 410 | fsm *f = &pcb->ccp_fsm;
|
---|
| 411 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 412 |
|
---|
| 413 | if (f->state != PPP_FSM_OPENED)
|
---|
| 414 | ccp_set(pcb, 1, 0, 0, 0);
|
---|
| 415 |
|
---|
| 416 | /*
|
---|
| 417 | * Find out which compressors the kernel supports before
|
---|
| 418 | * deciding whether to open in silent mode.
|
---|
| 419 | */
|
---|
| 420 | ccp_resetci(f);
|
---|
| 421 | if (!ccp_anycompress(go))
|
---|
| 422 | f->flags |= OPT_SILENT;
|
---|
| 423 |
|
---|
| 424 | fsm_open(f);
|
---|
| 425 | }
|
---|
| 426 |
|
---|
| 427 | /*
|
---|
| 428 | * ccp_close - Terminate CCP.
|
---|
| 429 | */
|
---|
| 430 | static void ccp_close(ppp_pcb *pcb, const char *reason) {
|
---|
| 431 | fsm *f = &pcb->ccp_fsm;
|
---|
| 432 | ccp_set(pcb, 0, 0, 0, 0);
|
---|
| 433 | fsm_close(f, reason);
|
---|
| 434 | }
|
---|
| 435 |
|
---|
| 436 | /*
|
---|
| 437 | * ccp_lowerup - we may now transmit CCP packets.
|
---|
| 438 | */
|
---|
| 439 | static void ccp_lowerup(ppp_pcb *pcb) {
|
---|
| 440 | fsm *f = &pcb->ccp_fsm;
|
---|
| 441 | fsm_lowerup(f);
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | /*
|
---|
| 445 | * ccp_lowerdown - we may not transmit CCP packets.
|
---|
| 446 | */
|
---|
| 447 | static void ccp_lowerdown(ppp_pcb *pcb) {
|
---|
| 448 | fsm *f = &pcb->ccp_fsm;
|
---|
| 449 | fsm_lowerdown(f);
|
---|
| 450 | }
|
---|
| 451 |
|
---|
| 452 | /*
|
---|
| 453 | * ccp_input - process a received CCP packet.
|
---|
| 454 | */
|
---|
| 455 | static void ccp_input(ppp_pcb *pcb, u_char *p, int len) {
|
---|
| 456 | fsm *f = &pcb->ccp_fsm;
|
---|
| 457 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 458 | int oldstate;
|
---|
| 459 |
|
---|
| 460 | /*
|
---|
| 461 | * Check for a terminate-request so we can print a message.
|
---|
| 462 | */
|
---|
| 463 | oldstate = f->state;
|
---|
| 464 | fsm_input(f, p, len);
|
---|
| 465 | if (oldstate == PPP_FSM_OPENED && p[0] == TERMREQ && f->state != PPP_FSM_OPENED) {
|
---|
| 466 | ppp_notice("Compression disabled by peer.");
|
---|
| 467 | #if MPPE_SUPPORT
|
---|
| 468 | if (go->mppe) {
|
---|
| 469 | ppp_error("MPPE disabled, closing LCP");
|
---|
| 470 | lcp_close(pcb, "MPPE disabled by peer");
|
---|
| 471 | }
|
---|
| 472 | #endif /* MPPE_SUPPORT */
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | /*
|
---|
| 476 | * If we get a terminate-ack and we're not asking for compression,
|
---|
| 477 | * close CCP.
|
---|
| 478 | */
|
---|
| 479 | if (oldstate == PPP_FSM_REQSENT && p[0] == TERMACK
|
---|
| 480 | && !ccp_anycompress(go))
|
---|
| 481 | ccp_close(pcb, "No compression negotiated");
|
---|
| 482 | }
|
---|
| 483 |
|
---|
| 484 | /*
|
---|
| 485 | * Handle a CCP-specific code.
|
---|
| 486 | */
|
---|
| 487 | static int ccp_extcode(fsm *f, int code, int id, u_char *p, int len) {
|
---|
| 488 | ppp_pcb *pcb = f->pcb;
|
---|
| 489 | LWIP_UNUSED_ARG(p);
|
---|
| 490 | LWIP_UNUSED_ARG(len);
|
---|
| 491 |
|
---|
| 492 | switch (code) {
|
---|
| 493 | case CCP_RESETREQ:
|
---|
| 494 | if (f->state != PPP_FSM_OPENED)
|
---|
| 495 | break;
|
---|
| 496 | ccp_reset_comp(pcb);
|
---|
| 497 | /* send a reset-ack, which the transmitter will see and
|
---|
| 498 | reset its compression state. */
|
---|
| 499 | fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
|
---|
| 500 | break;
|
---|
| 501 |
|
---|
| 502 | case CCP_RESETACK:
|
---|
| 503 | if ((pcb->ccp_localstate & RACK_PENDING) && id == f->reqid) {
|
---|
| 504 | pcb->ccp_localstate &= ~(RACK_PENDING | RREQ_REPEAT);
|
---|
| 505 | UNTIMEOUT(ccp_rack_timeout, f);
|
---|
| 506 | ccp_reset_decomp(pcb);
|
---|
| 507 | }
|
---|
| 508 | break;
|
---|
| 509 |
|
---|
| 510 | default:
|
---|
| 511 | return 0;
|
---|
| 512 | }
|
---|
| 513 |
|
---|
| 514 | return 1;
|
---|
| 515 | }
|
---|
| 516 |
|
---|
| 517 | /*
|
---|
| 518 | * ccp_protrej - peer doesn't talk CCP.
|
---|
| 519 | */
|
---|
| 520 | static void ccp_protrej(ppp_pcb *pcb) {
|
---|
| 521 | fsm *f = &pcb->ccp_fsm;
|
---|
| 522 | #if MPPE_SUPPORT
|
---|
| 523 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 524 | #endif /* MPPE_SUPPORT */
|
---|
| 525 |
|
---|
| 526 | ccp_set(pcb, 0, 0, 0, 0);
|
---|
| 527 | fsm_lowerdown(f);
|
---|
| 528 |
|
---|
| 529 | #if MPPE_SUPPORT
|
---|
| 530 | if (go->mppe) {
|
---|
| 531 | ppp_error("MPPE required but peer negotiation failed");
|
---|
| 532 | lcp_close(pcb, "MPPE required but peer negotiation failed");
|
---|
| 533 | }
|
---|
| 534 | #endif /* MPPE_SUPPORT */
|
---|
| 535 |
|
---|
| 536 | }
|
---|
| 537 |
|
---|
| 538 | /*
|
---|
| 539 | * ccp_resetci - initialize at start of negotiation.
|
---|
| 540 | */
|
---|
| 541 | static void ccp_resetci(fsm *f) {
|
---|
| 542 | ppp_pcb *pcb = f->pcb;
|
---|
| 543 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 544 | ccp_options *wo = &pcb->ccp_wantoptions;
|
---|
| 545 | #if MPPE_SUPPORT
|
---|
| 546 | ccp_options *ao = &pcb->ccp_allowoptions;
|
---|
| 547 | #endif /* MPPE_SUPPORT */
|
---|
| 548 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT
|
---|
| 549 | u_char opt_buf[CCP_MAX_OPTION_LENGTH];
|
---|
| 550 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT */
|
---|
| 551 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT
|
---|
| 552 | int res;
|
---|
| 553 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT */
|
---|
| 554 |
|
---|
| 555 | #if MPPE_SUPPORT
|
---|
| 556 | if (pcb->settings.require_mppe) {
|
---|
| 557 | wo->mppe = ao->mppe =
|
---|
| 558 | (pcb->settings.refuse_mppe_40 ? 0 : MPPE_OPT_40)
|
---|
| 559 | | (pcb->settings.refuse_mppe_128 ? 0 : MPPE_OPT_128);
|
---|
| 560 | }
|
---|
| 561 | #endif /* MPPE_SUPPORT */
|
---|
| 562 |
|
---|
| 563 | *go = *wo;
|
---|
| 564 | pcb->ccp_all_rejected = 0;
|
---|
| 565 |
|
---|
| 566 | #if MPPE_SUPPORT
|
---|
| 567 | if (go->mppe) {
|
---|
| 568 | int auth_mschap_bits = pcb->auth_done;
|
---|
| 569 | int numbits;
|
---|
| 570 |
|
---|
| 571 | /*
|
---|
| 572 | * Start with a basic sanity check: mschap[v2] auth must be in
|
---|
| 573 | * exactly one direction. RFC 3079 says that the keys are
|
---|
| 574 | * 'derived from the credentials of the peer that initiated the call',
|
---|
| 575 | * however the PPP protocol doesn't have such a concept, and pppd
|
---|
| 576 | * cannot get this info externally. Instead we do the best we can.
|
---|
| 577 | * NB: If MPPE is required, all other compression opts are invalid.
|
---|
| 578 | * So, we return right away if we can't do it.
|
---|
| 579 | */
|
---|
| 580 |
|
---|
| 581 | /* Leave only the mschap auth bits set */
|
---|
| 582 | auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
|
---|
| 583 | CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
|
---|
| 584 | /* Count the mschap auths */
|
---|
| 585 | auth_mschap_bits >>= CHAP_MS_SHIFT;
|
---|
| 586 | numbits = 0;
|
---|
| 587 | do {
|
---|
| 588 | numbits += auth_mschap_bits & 1;
|
---|
| 589 | auth_mschap_bits >>= 1;
|
---|
| 590 | } while (auth_mschap_bits);
|
---|
| 591 | if (numbits > 1) {
|
---|
| 592 | ppp_error("MPPE required, but auth done in both directions.");
|
---|
| 593 | lcp_close(pcb, "MPPE required but not available");
|
---|
| 594 | return;
|
---|
| 595 | }
|
---|
| 596 | if (!numbits) {
|
---|
| 597 | ppp_error("MPPE required, but MS-CHAP[v2] auth not performed.");
|
---|
| 598 | lcp_close(pcb, "MPPE required but not available");
|
---|
| 599 | return;
|
---|
| 600 | }
|
---|
| 601 |
|
---|
| 602 | /* A plugin (eg radius) may not have obtained key material. */
|
---|
| 603 | if (!pcb->mppe_keys_set) {
|
---|
| 604 | ppp_error("MPPE required, but keys are not available. "
|
---|
| 605 | "Possible plugin problem?");
|
---|
| 606 | lcp_close(pcb, "MPPE required but not available");
|
---|
| 607 | return;
|
---|
| 608 | }
|
---|
| 609 |
|
---|
| 610 | /* LM auth not supported for MPPE */
|
---|
| 611 | if (pcb->auth_done & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
|
---|
| 612 | /* This might be noise */
|
---|
| 613 | if (go->mppe & MPPE_OPT_40) {
|
---|
| 614 | ppp_notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
|
---|
| 615 | go->mppe &= ~MPPE_OPT_40;
|
---|
| 616 | wo->mppe &= ~MPPE_OPT_40;
|
---|
| 617 | }
|
---|
| 618 | }
|
---|
| 619 |
|
---|
| 620 | /* Last check: can we actually negotiate something? */
|
---|
| 621 | if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
|
---|
| 622 | /* Could be misconfig, could be 40-bit disabled above. */
|
---|
| 623 | ppp_error("MPPE required, but both 40-bit and 128-bit disabled.");
|
---|
| 624 | lcp_close(pcb, "MPPE required but not available");
|
---|
| 625 | return;
|
---|
| 626 | }
|
---|
| 627 |
|
---|
| 628 | /* sync options */
|
---|
| 629 | ao->mppe = go->mppe;
|
---|
| 630 | /* MPPE is not compatible with other compression types */
|
---|
| 631 | #if BSDCOMPRESS_SUPPORT
|
---|
| 632 | ao->bsd_compress = go->bsd_compress = 0;
|
---|
| 633 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 634 | #if PREDICTOR_SUPPORT
|
---|
| 635 | ao->predictor_1 = go->predictor_1 = 0;
|
---|
| 636 | ao->predictor_2 = go->predictor_2 = 0;
|
---|
| 637 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 638 | #if DEFLATE_SUPPORT
|
---|
| 639 | ao->deflate = go->deflate = 0;
|
---|
| 640 | #endif /* DEFLATE_SUPPORT */
|
---|
| 641 | }
|
---|
| 642 | #endif /* MPPE_SUPPORT */
|
---|
| 643 |
|
---|
| 644 | /*
|
---|
| 645 | * Check whether the kernel knows about the various
|
---|
| 646 | * compression methods we might request.
|
---|
| 647 | */
|
---|
| 648 | #if BSDCOMPRESS_SUPPORT
|
---|
| 649 | /* FIXME: we don't need to test if BSD compress is available
|
---|
| 650 | * if BSDCOMPRESS_SUPPORT is set, it is.
|
---|
| 651 | */
|
---|
| 652 | if (go->bsd_compress) {
|
---|
| 653 | opt_buf[0] = CI_BSD_COMPRESS;
|
---|
| 654 | opt_buf[1] = CILEN_BSD_COMPRESS;
|
---|
| 655 | for (;;) {
|
---|
| 656 | if (go->bsd_bits < BSD_MIN_BITS) {
|
---|
| 657 | go->bsd_compress = 0;
|
---|
| 658 | break;
|
---|
| 659 | }
|
---|
| 660 | opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
|
---|
| 661 | res = ccp_test(pcb, opt_buf, CILEN_BSD_COMPRESS, 0);
|
---|
| 662 | if (res > 0) {
|
---|
| 663 | break;
|
---|
| 664 | } else if (res < 0) {
|
---|
| 665 | go->bsd_compress = 0;
|
---|
| 666 | break;
|
---|
| 667 | }
|
---|
| 668 | go->bsd_bits--;
|
---|
| 669 | }
|
---|
| 670 | }
|
---|
| 671 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 672 | #if DEFLATE_SUPPORT
|
---|
| 673 | /* FIXME: we don't need to test if deflate is available
|
---|
| 674 | * if DEFLATE_SUPPORT is set, it is.
|
---|
| 675 | */
|
---|
| 676 | if (go->deflate) {
|
---|
| 677 | if (go->deflate_correct) {
|
---|
| 678 | opt_buf[0] = CI_DEFLATE;
|
---|
| 679 | opt_buf[1] = CILEN_DEFLATE;
|
---|
| 680 | opt_buf[3] = DEFLATE_CHK_SEQUENCE;
|
---|
| 681 | for (;;) {
|
---|
| 682 | if (go->deflate_size < DEFLATE_MIN_WORKS) {
|
---|
| 683 | go->deflate_correct = 0;
|
---|
| 684 | break;
|
---|
| 685 | }
|
---|
| 686 | opt_buf[2] = DEFLATE_MAKE_OPT(go->deflate_size);
|
---|
| 687 | res = ccp_test(pcb, opt_buf, CILEN_DEFLATE, 0);
|
---|
| 688 | if (res > 0) {
|
---|
| 689 | break;
|
---|
| 690 | } else if (res < 0) {
|
---|
| 691 | go->deflate_correct = 0;
|
---|
| 692 | break;
|
---|
| 693 | }
|
---|
| 694 | go->deflate_size--;
|
---|
| 695 | }
|
---|
| 696 | }
|
---|
| 697 | if (go->deflate_draft) {
|
---|
| 698 | opt_buf[0] = CI_DEFLATE_DRAFT;
|
---|
| 699 | opt_buf[1] = CILEN_DEFLATE;
|
---|
| 700 | opt_buf[3] = DEFLATE_CHK_SEQUENCE;
|
---|
| 701 | for (;;) {
|
---|
| 702 | if (go->deflate_size < DEFLATE_MIN_WORKS) {
|
---|
| 703 | go->deflate_draft = 0;
|
---|
| 704 | break;
|
---|
| 705 | }
|
---|
| 706 | opt_buf[2] = DEFLATE_MAKE_OPT(go->deflate_size);
|
---|
| 707 | res = ccp_test(pcb, opt_buf, CILEN_DEFLATE, 0);
|
---|
| 708 | if (res > 0) {
|
---|
| 709 | break;
|
---|
| 710 | } else if (res < 0) {
|
---|
| 711 | go->deflate_draft = 0;
|
---|
| 712 | break;
|
---|
| 713 | }
|
---|
| 714 | go->deflate_size--;
|
---|
| 715 | }
|
---|
| 716 | }
|
---|
| 717 | if (!go->deflate_correct && !go->deflate_draft)
|
---|
| 718 | go->deflate = 0;
|
---|
| 719 | }
|
---|
| 720 | #endif /* DEFLATE_SUPPORT */
|
---|
| 721 | #if PREDICTOR_SUPPORT
|
---|
| 722 | /* FIXME: we don't need to test if predictor is available,
|
---|
| 723 | * if PREDICTOR_SUPPORT is set, it is.
|
---|
| 724 | */
|
---|
| 725 | if (go->predictor_1) {
|
---|
| 726 | opt_buf[0] = CI_PREDICTOR_1;
|
---|
| 727 | opt_buf[1] = CILEN_PREDICTOR_1;
|
---|
| 728 | if (ccp_test(pcb, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
|
---|
| 729 | go->predictor_1 = 0;
|
---|
| 730 | }
|
---|
| 731 | if (go->predictor_2) {
|
---|
| 732 | opt_buf[0] = CI_PREDICTOR_2;
|
---|
| 733 | opt_buf[1] = CILEN_PREDICTOR_2;
|
---|
| 734 | if (ccp_test(pcb, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
|
---|
| 735 | go->predictor_2 = 0;
|
---|
| 736 | }
|
---|
| 737 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 738 | }
|
---|
| 739 |
|
---|
| 740 | /*
|
---|
| 741 | * ccp_cilen - Return total length of our configuration info.
|
---|
| 742 | */
|
---|
| 743 | static int ccp_cilen(fsm *f) {
|
---|
| 744 | ppp_pcb *pcb = f->pcb;
|
---|
| 745 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 746 |
|
---|
| 747 | return 0
|
---|
| 748 | #if BSDCOMPRESS_SUPPORT
|
---|
| 749 | + (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
|
---|
| 750 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 751 | #if DEFLATE_SUPPORT
|
---|
| 752 | + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
|
---|
| 753 | + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
|
---|
| 754 | #endif /* DEFLATE_SUPPORT */
|
---|
| 755 | #if PREDICTOR_SUPPORT
|
---|
| 756 | + (go->predictor_1? CILEN_PREDICTOR_1: 0)
|
---|
| 757 | + (go->predictor_2? CILEN_PREDICTOR_2: 0)
|
---|
| 758 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 759 | #if MPPE_SUPPORT
|
---|
| 760 | + (go->mppe? CILEN_MPPE: 0)
|
---|
| 761 | #endif /* MPPE_SUPPORT */
|
---|
| 762 | ;
|
---|
| 763 | }
|
---|
| 764 |
|
---|
| 765 | /*
|
---|
| 766 | * ccp_addci - put our requests in a packet.
|
---|
| 767 | */
|
---|
| 768 | static void ccp_addci(fsm *f, u_char *p, int *lenp) {
|
---|
| 769 | ppp_pcb *pcb = f->pcb;
|
---|
| 770 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 771 | u_char *p0 = p;
|
---|
| 772 |
|
---|
| 773 | /*
|
---|
| 774 | * Add the compression types that we can receive, in decreasing
|
---|
| 775 | * preference order.
|
---|
| 776 | */
|
---|
| 777 | #if MPPE_SUPPORT
|
---|
| 778 | if (go->mppe) {
|
---|
| 779 | p[0] = CI_MPPE;
|
---|
| 780 | p[1] = CILEN_MPPE;
|
---|
| 781 | MPPE_OPTS_TO_CI(go->mppe, &p[2]);
|
---|
| 782 | mppe_init(pcb, &pcb->mppe_decomp, go->mppe);
|
---|
| 783 | p += CILEN_MPPE;
|
---|
| 784 | }
|
---|
| 785 | #endif /* MPPE_SUPPORT */
|
---|
| 786 | #if DEFLATE_SUPPORT
|
---|
| 787 | if (go->deflate) {
|
---|
| 788 | if (go->deflate_correct) {
|
---|
| 789 | p[0] = CI_DEFLATE;
|
---|
| 790 | p[1] = CILEN_DEFLATE;
|
---|
| 791 | p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
|
---|
| 792 | p[3] = DEFLATE_CHK_SEQUENCE;
|
---|
| 793 | p += CILEN_DEFLATE;
|
---|
| 794 | }
|
---|
| 795 | if (go->deflate_draft) {
|
---|
| 796 | p[0] = CI_DEFLATE_DRAFT;
|
---|
| 797 | p[1] = CILEN_DEFLATE;
|
---|
| 798 | p[2] = p[2 - CILEN_DEFLATE];
|
---|
| 799 | p[3] = DEFLATE_CHK_SEQUENCE;
|
---|
| 800 | p += CILEN_DEFLATE;
|
---|
| 801 | }
|
---|
| 802 | }
|
---|
| 803 | #endif /* DEFLATE_SUPPORT */
|
---|
| 804 | #if BSDCOMPRESS_SUPPORT
|
---|
| 805 | if (go->bsd_compress) {
|
---|
| 806 | p[0] = CI_BSD_COMPRESS;
|
---|
| 807 | p[1] = CILEN_BSD_COMPRESS;
|
---|
| 808 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
|
---|
| 809 | p += CILEN_BSD_COMPRESS;
|
---|
| 810 | }
|
---|
| 811 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 812 | #if PREDICTOR_SUPPORT
|
---|
| 813 | /* XXX Should Predictor 2 be preferable to Predictor 1? */
|
---|
| 814 | if (go->predictor_1) {
|
---|
| 815 | p[0] = CI_PREDICTOR_1;
|
---|
| 816 | p[1] = CILEN_PREDICTOR_1;
|
---|
| 817 | p += CILEN_PREDICTOR_1;
|
---|
| 818 | }
|
---|
| 819 | if (go->predictor_2) {
|
---|
| 820 | p[0] = CI_PREDICTOR_2;
|
---|
| 821 | p[1] = CILEN_PREDICTOR_2;
|
---|
| 822 | p += CILEN_PREDICTOR_2;
|
---|
| 823 | }
|
---|
| 824 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 825 |
|
---|
| 826 | go->method = (p > p0)? p0[0]: 0;
|
---|
| 827 |
|
---|
| 828 | *lenp = p - p0;
|
---|
| 829 | }
|
---|
| 830 |
|
---|
| 831 | /*
|
---|
| 832 | * ccp_ackci - process a received configure-ack, and return
|
---|
| 833 | * 1 iff the packet was OK.
|
---|
| 834 | */
|
---|
| 835 | static int ccp_ackci(fsm *f, u_char *p, int len) {
|
---|
| 836 | ppp_pcb *pcb = f->pcb;
|
---|
| 837 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 838 | #if BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT
|
---|
| 839 | u_char *p0 = p;
|
---|
| 840 | #endif /* BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT */
|
---|
| 841 |
|
---|
| 842 | #if MPPE_SUPPORT
|
---|
| 843 | if (go->mppe) {
|
---|
| 844 | u_char opt_buf[CILEN_MPPE];
|
---|
| 845 |
|
---|
| 846 | opt_buf[0] = CI_MPPE;
|
---|
| 847 | opt_buf[1] = CILEN_MPPE;
|
---|
| 848 | MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
|
---|
| 849 | if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
|
---|
| 850 | return 0;
|
---|
| 851 | p += CILEN_MPPE;
|
---|
| 852 | len -= CILEN_MPPE;
|
---|
| 853 | /* XXX Cope with first/fast ack */
|
---|
| 854 | if (len == 0)
|
---|
| 855 | return 1;
|
---|
| 856 | }
|
---|
| 857 | #endif /* MPPE_SUPPORT */
|
---|
| 858 | #if DEFLATE_SUPPORT
|
---|
| 859 | if (go->deflate) {
|
---|
| 860 | if (len < CILEN_DEFLATE
|
---|
| 861 | || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
|
---|
| 862 | || p[1] != CILEN_DEFLATE
|
---|
| 863 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
---|
| 864 | || p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 865 | return 0;
|
---|
| 866 | p += CILEN_DEFLATE;
|
---|
| 867 | len -= CILEN_DEFLATE;
|
---|
| 868 | /* XXX Cope with first/fast ack */
|
---|
| 869 | if (len == 0)
|
---|
| 870 | return 1;
|
---|
| 871 | if (go->deflate_correct && go->deflate_draft) {
|
---|
| 872 | if (len < CILEN_DEFLATE
|
---|
| 873 | || p[0] != CI_DEFLATE_DRAFT
|
---|
| 874 | || p[1] != CILEN_DEFLATE
|
---|
| 875 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
---|
| 876 | || p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 877 | return 0;
|
---|
| 878 | p += CILEN_DEFLATE;
|
---|
| 879 | len -= CILEN_DEFLATE;
|
---|
| 880 | }
|
---|
| 881 | }
|
---|
| 882 | #endif /* DEFLATE_SUPPORT */
|
---|
| 883 | #if BSDCOMPRESS_SUPPORT
|
---|
| 884 | if (go->bsd_compress) {
|
---|
| 885 | if (len < CILEN_BSD_COMPRESS
|
---|
| 886 | || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
|
---|
| 887 | || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
|
---|
| 888 | return 0;
|
---|
| 889 | p += CILEN_BSD_COMPRESS;
|
---|
| 890 | len -= CILEN_BSD_COMPRESS;
|
---|
| 891 | /* XXX Cope with first/fast ack */
|
---|
| 892 | if (p == p0 && len == 0)
|
---|
| 893 | return 1;
|
---|
| 894 | }
|
---|
| 895 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 896 | #if PREDICTOR_SUPPORT
|
---|
| 897 | if (go->predictor_1) {
|
---|
| 898 | if (len < CILEN_PREDICTOR_1
|
---|
| 899 | || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
|
---|
| 900 | return 0;
|
---|
| 901 | p += CILEN_PREDICTOR_1;
|
---|
| 902 | len -= CILEN_PREDICTOR_1;
|
---|
| 903 | /* XXX Cope with first/fast ack */
|
---|
| 904 | if (p == p0 && len == 0)
|
---|
| 905 | return 1;
|
---|
| 906 | }
|
---|
| 907 | if (go->predictor_2) {
|
---|
| 908 | if (len < CILEN_PREDICTOR_2
|
---|
| 909 | || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
|
---|
| 910 | return 0;
|
---|
| 911 | p += CILEN_PREDICTOR_2;
|
---|
| 912 | len -= CILEN_PREDICTOR_2;
|
---|
| 913 | /* XXX Cope with first/fast ack */
|
---|
| 914 | if (p == p0 && len == 0)
|
---|
| 915 | return 1;
|
---|
| 916 | }
|
---|
| 917 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 918 |
|
---|
| 919 | if (len != 0)
|
---|
| 920 | return 0;
|
---|
| 921 | return 1;
|
---|
| 922 | }
|
---|
| 923 |
|
---|
| 924 | /*
|
---|
| 925 | * ccp_nakci - process received configure-nak.
|
---|
| 926 | * Returns 1 iff the nak was OK.
|
---|
| 927 | */
|
---|
| 928 | static int ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) {
|
---|
| 929 | ppp_pcb *pcb = f->pcb;
|
---|
| 930 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 931 | ccp_options no; /* options we've seen already */
|
---|
| 932 | ccp_options try_; /* options to ask for next time */
|
---|
| 933 | LWIP_UNUSED_ARG(treat_as_reject);
|
---|
| 934 | #if !MPPE_SUPPORT && !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT
|
---|
| 935 | LWIP_UNUSED_ARG(p);
|
---|
| 936 | LWIP_UNUSED_ARG(len);
|
---|
| 937 | #endif /* !MPPE_SUPPORT && !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT */
|
---|
| 938 |
|
---|
| 939 | memset(&no, 0, sizeof(no));
|
---|
| 940 | try_ = *go;
|
---|
| 941 |
|
---|
| 942 | #if MPPE_SUPPORT
|
---|
| 943 | if (go->mppe && len >= CILEN_MPPE
|
---|
| 944 | && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
|
---|
| 945 | no.mppe = 1;
|
---|
| 946 | /*
|
---|
| 947 | * Peer wants us to use a different strength or other setting.
|
---|
| 948 | * Fail if we aren't willing to use his suggestion.
|
---|
| 949 | */
|
---|
| 950 | MPPE_CI_TO_OPTS(&p[2], try_.mppe);
|
---|
| 951 | if ((try_.mppe & MPPE_OPT_STATEFUL) && pcb->settings.refuse_mppe_stateful) {
|
---|
| 952 | ppp_error("Refusing MPPE stateful mode offered by peer");
|
---|
| 953 | try_.mppe = 0;
|
---|
| 954 | } else if (((go->mppe | MPPE_OPT_STATEFUL) & try_.mppe) != try_.mppe) {
|
---|
| 955 | /* Peer must have set options we didn't request (suggest) */
|
---|
| 956 | try_.mppe = 0;
|
---|
| 957 | }
|
---|
| 958 |
|
---|
| 959 | if (!try_.mppe) {
|
---|
| 960 | ppp_error("MPPE required but peer negotiation failed");
|
---|
| 961 | lcp_close(pcb, "MPPE required but peer negotiation failed");
|
---|
| 962 | }
|
---|
| 963 | }
|
---|
| 964 | #endif /* MPPE_SUPPORT */
|
---|
| 965 | #if DEFLATE_SUPPORT
|
---|
| 966 | if (go->deflate && len >= CILEN_DEFLATE
|
---|
| 967 | && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
|
---|
| 968 | && p[1] == CILEN_DEFLATE) {
|
---|
| 969 | no.deflate = 1;
|
---|
| 970 | /*
|
---|
| 971 | * Peer wants us to use a different code size or something.
|
---|
| 972 | * Stop asking for Deflate if we don't understand his suggestion.
|
---|
| 973 | */
|
---|
| 974 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
---|
| 975 | || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
|
---|
| 976 | || p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 977 | try_.deflate = 0;
|
---|
| 978 | else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
|
---|
| 979 | try_.deflate_size = DEFLATE_SIZE(p[2]);
|
---|
| 980 | p += CILEN_DEFLATE;
|
---|
| 981 | len -= CILEN_DEFLATE;
|
---|
| 982 | if (go->deflate_correct && go->deflate_draft
|
---|
| 983 | && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
|
---|
| 984 | && p[1] == CILEN_DEFLATE) {
|
---|
| 985 | p += CILEN_DEFLATE;
|
---|
| 986 | len -= CILEN_DEFLATE;
|
---|
| 987 | }
|
---|
| 988 | }
|
---|
| 989 | #endif /* DEFLATE_SUPPORT */
|
---|
| 990 | #if BSDCOMPRESS_SUPPORT
|
---|
| 991 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
|
---|
| 992 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
|
---|
| 993 | no.bsd_compress = 1;
|
---|
| 994 | /*
|
---|
| 995 | * Peer wants us to use a different number of bits
|
---|
| 996 | * or a different version.
|
---|
| 997 | */
|
---|
| 998 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
|
---|
| 999 | try_.bsd_compress = 0;
|
---|
| 1000 | else if (BSD_NBITS(p[2]) < go->bsd_bits)
|
---|
| 1001 | try_.bsd_bits = BSD_NBITS(p[2]);
|
---|
| 1002 | p += CILEN_BSD_COMPRESS;
|
---|
| 1003 | len -= CILEN_BSD_COMPRESS;
|
---|
| 1004 | }
|
---|
| 1005 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 1006 |
|
---|
| 1007 | /*
|
---|
| 1008 | * Predictor-1 and 2 have no options, so they can't be Naked.
|
---|
| 1009 | *
|
---|
| 1010 | * There may be remaining options but we ignore them.
|
---|
| 1011 | */
|
---|
| 1012 |
|
---|
| 1013 | if (f->state != PPP_FSM_OPENED)
|
---|
| 1014 | *go = try_;
|
---|
| 1015 | return 1;
|
---|
| 1016 | }
|
---|
| 1017 |
|
---|
| 1018 | /*
|
---|
| 1019 | * ccp_rejci - reject some of our suggested compression methods.
|
---|
| 1020 | */
|
---|
| 1021 | static int ccp_rejci(fsm *f, u_char *p, int len) {
|
---|
| 1022 | ppp_pcb *pcb = f->pcb;
|
---|
| 1023 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 1024 | ccp_options try_; /* options to request next time */
|
---|
| 1025 |
|
---|
| 1026 | try_ = *go;
|
---|
| 1027 |
|
---|
| 1028 | /*
|
---|
| 1029 | * Cope with empty configure-rejects by ceasing to send
|
---|
| 1030 | * configure-requests.
|
---|
| 1031 | */
|
---|
| 1032 | if (len == 0 && pcb->ccp_all_rejected)
|
---|
| 1033 | return -1;
|
---|
| 1034 |
|
---|
| 1035 | #if MPPE_SUPPORT
|
---|
| 1036 | if (go->mppe && len >= CILEN_MPPE
|
---|
| 1037 | && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
|
---|
| 1038 | ppp_error("MPPE required but peer refused");
|
---|
| 1039 | lcp_close(pcb, "MPPE required but peer refused");
|
---|
| 1040 | p += CILEN_MPPE;
|
---|
| 1041 | len -= CILEN_MPPE;
|
---|
| 1042 | }
|
---|
| 1043 | #endif /* MPPE_SUPPORT */
|
---|
| 1044 | #if DEFLATE_SUPPORT
|
---|
| 1045 | if (go->deflate_correct && len >= CILEN_DEFLATE
|
---|
| 1046 | && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
|
---|
| 1047 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
---|
| 1048 | || p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 1049 | return 0; /* Rej is bad */
|
---|
| 1050 | try_.deflate_correct = 0;
|
---|
| 1051 | p += CILEN_DEFLATE;
|
---|
| 1052 | len -= CILEN_DEFLATE;
|
---|
| 1053 | }
|
---|
| 1054 | if (go->deflate_draft && len >= CILEN_DEFLATE
|
---|
| 1055 | && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
|
---|
| 1056 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
---|
| 1057 | || p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 1058 | return 0; /* Rej is bad */
|
---|
| 1059 | try_.deflate_draft = 0;
|
---|
| 1060 | p += CILEN_DEFLATE;
|
---|
| 1061 | len -= CILEN_DEFLATE;
|
---|
| 1062 | }
|
---|
| 1063 | if (!try_.deflate_correct && !try_.deflate_draft)
|
---|
| 1064 | try_.deflate = 0;
|
---|
| 1065 | #endif /* DEFLATE_SUPPORT */
|
---|
| 1066 | #if BSDCOMPRESS_SUPPORT
|
---|
| 1067 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
|
---|
| 1068 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
|
---|
| 1069 | if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
|
---|
| 1070 | return 0;
|
---|
| 1071 | try_.bsd_compress = 0;
|
---|
| 1072 | p += CILEN_BSD_COMPRESS;
|
---|
| 1073 | len -= CILEN_BSD_COMPRESS;
|
---|
| 1074 | }
|
---|
| 1075 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 1076 | #if PREDICTOR_SUPPORT
|
---|
| 1077 | if (go->predictor_1 && len >= CILEN_PREDICTOR_1
|
---|
| 1078 | && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
|
---|
| 1079 | try_.predictor_1 = 0;
|
---|
| 1080 | p += CILEN_PREDICTOR_1;
|
---|
| 1081 | len -= CILEN_PREDICTOR_1;
|
---|
| 1082 | }
|
---|
| 1083 | if (go->predictor_2 && len >= CILEN_PREDICTOR_2
|
---|
| 1084 | && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
|
---|
| 1085 | try_.predictor_2 = 0;
|
---|
| 1086 | p += CILEN_PREDICTOR_2;
|
---|
| 1087 | len -= CILEN_PREDICTOR_2;
|
---|
| 1088 | }
|
---|
| 1089 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 1090 |
|
---|
| 1091 | if (len != 0)
|
---|
| 1092 | return 0;
|
---|
| 1093 |
|
---|
| 1094 | if (f->state != PPP_FSM_OPENED)
|
---|
| 1095 | *go = try_;
|
---|
| 1096 |
|
---|
| 1097 | return 1;
|
---|
| 1098 | }
|
---|
| 1099 |
|
---|
| 1100 | /*
|
---|
| 1101 | * ccp_reqci - processed a received configure-request.
|
---|
| 1102 | * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
|
---|
| 1103 | * appropriately.
|
---|
| 1104 | */
|
---|
| 1105 | static int ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak) {
|
---|
| 1106 | ppp_pcb *pcb = f->pcb;
|
---|
| 1107 | ccp_options *ho = &pcb->ccp_hisoptions;
|
---|
| 1108 | ccp_options *ao = &pcb->ccp_allowoptions;
|
---|
| 1109 | int ret, newret;
|
---|
| 1110 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT
|
---|
| 1111 | int res;
|
---|
| 1112 | int nb;
|
---|
| 1113 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT */
|
---|
| 1114 | u_char *p0, *retp;
|
---|
| 1115 | int len, clen, type;
|
---|
| 1116 | #if MPPE_SUPPORT
|
---|
| 1117 | u8_t rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
|
---|
| 1118 | /* CI_MPPE, or due to other options? */
|
---|
| 1119 | #endif /* MPPE_SUPPORT */
|
---|
| 1120 |
|
---|
| 1121 | ret = CONFACK;
|
---|
| 1122 | retp = p0 = p;
|
---|
| 1123 | len = *lenp;
|
---|
| 1124 |
|
---|
| 1125 | memset(ho, 0, sizeof(ccp_options));
|
---|
| 1126 | ho->method = (len > 0)? p[0]: 0;
|
---|
| 1127 |
|
---|
| 1128 | while (len > 0) {
|
---|
| 1129 | newret = CONFACK;
|
---|
| 1130 | if (len < 2 || p[1] < 2 || p[1] > len) {
|
---|
| 1131 | /* length is bad */
|
---|
| 1132 | clen = len;
|
---|
| 1133 | newret = CONFREJ;
|
---|
| 1134 |
|
---|
| 1135 | } else {
|
---|
| 1136 | type = p[0];
|
---|
| 1137 | clen = p[1];
|
---|
| 1138 |
|
---|
| 1139 | switch (type) {
|
---|
| 1140 | #if MPPE_SUPPORT
|
---|
| 1141 | case CI_MPPE:
|
---|
| 1142 | if (!ao->mppe || clen != CILEN_MPPE) {
|
---|
| 1143 | newret = CONFREJ;
|
---|
| 1144 | break;
|
---|
| 1145 | }
|
---|
| 1146 | MPPE_CI_TO_OPTS(&p[2], ho->mppe);
|
---|
| 1147 |
|
---|
| 1148 | /* Nak if anything unsupported or unknown are set. */
|
---|
| 1149 | if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
|
---|
| 1150 | newret = CONFNAK;
|
---|
| 1151 | ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
|
---|
| 1152 | }
|
---|
| 1153 | if (ho->mppe & MPPE_OPT_UNKNOWN) {
|
---|
| 1154 | newret = CONFNAK;
|
---|
| 1155 | ho->mppe &= ~MPPE_OPT_UNKNOWN;
|
---|
| 1156 | }
|
---|
| 1157 |
|
---|
| 1158 | /* Check state opt */
|
---|
| 1159 | if (ho->mppe & MPPE_OPT_STATEFUL) {
|
---|
| 1160 | /*
|
---|
| 1161 | * We can Nak and request stateless, but it's a
|
---|
| 1162 | * lot easier to just assume the peer will request
|
---|
| 1163 | * it if he can do it; stateful mode is bad over
|
---|
| 1164 | * the Internet -- which is where we expect MPPE.
|
---|
| 1165 | */
|
---|
| 1166 | if (pcb->settings.refuse_mppe_stateful) {
|
---|
| 1167 | ppp_error("Refusing MPPE stateful mode offered by peer");
|
---|
| 1168 | newret = CONFREJ;
|
---|
| 1169 | break;
|
---|
| 1170 | }
|
---|
| 1171 | }
|
---|
| 1172 |
|
---|
| 1173 | /* Find out which of {S,L} are set. */
|
---|
| 1174 | if ((ho->mppe & MPPE_OPT_128)
|
---|
| 1175 | && (ho->mppe & MPPE_OPT_40)) {
|
---|
| 1176 | /* Both are set, negotiate the strongest. */
|
---|
| 1177 | newret = CONFNAK;
|
---|
| 1178 | if (ao->mppe & MPPE_OPT_128)
|
---|
| 1179 | ho->mppe &= ~MPPE_OPT_40;
|
---|
| 1180 | else if (ao->mppe & MPPE_OPT_40)
|
---|
| 1181 | ho->mppe &= ~MPPE_OPT_128;
|
---|
| 1182 | else {
|
---|
| 1183 | newret = CONFREJ;
|
---|
| 1184 | break;
|
---|
| 1185 | }
|
---|
| 1186 | } else if (ho->mppe & MPPE_OPT_128) {
|
---|
| 1187 | if (!(ao->mppe & MPPE_OPT_128)) {
|
---|
| 1188 | newret = CONFREJ;
|
---|
| 1189 | break;
|
---|
| 1190 | }
|
---|
| 1191 | } else if (ho->mppe & MPPE_OPT_40) {
|
---|
| 1192 | if (!(ao->mppe & MPPE_OPT_40)) {
|
---|
| 1193 | newret = CONFREJ;
|
---|
| 1194 | break;
|
---|
| 1195 | }
|
---|
| 1196 | } else {
|
---|
| 1197 | /* Neither are set. */
|
---|
| 1198 | /* We cannot accept this. */
|
---|
| 1199 | newret = CONFNAK;
|
---|
| 1200 | /* Give the peer our idea of what can be used,
|
---|
| 1201 | so it can choose and confirm */
|
---|
| 1202 | ho->mppe = ao->mppe;
|
---|
| 1203 | }
|
---|
| 1204 |
|
---|
| 1205 | /* rebuild the opts */
|
---|
| 1206 | MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
|
---|
| 1207 | if (newret == CONFACK) {
|
---|
| 1208 | int mtu;
|
---|
| 1209 |
|
---|
| 1210 | mppe_init(pcb, &pcb->mppe_comp, ho->mppe);
|
---|
| 1211 | /*
|
---|
| 1212 | * We need to decrease the interface MTU by MPPE_PAD
|
---|
| 1213 | * because MPPE frames **grow**. The kernel [must]
|
---|
| 1214 | * allocate MPPE_PAD extra bytes in xmit buffers.
|
---|
| 1215 | */
|
---|
| 1216 | mtu = netif_get_mtu(pcb);
|
---|
| 1217 | if (mtu)
|
---|
| 1218 | netif_set_mtu(pcb, mtu - MPPE_PAD);
|
---|
| 1219 | else
|
---|
| 1220 | newret = CONFREJ;
|
---|
| 1221 | }
|
---|
| 1222 |
|
---|
| 1223 | /*
|
---|
| 1224 | * We have accepted MPPE or are willing to negotiate
|
---|
| 1225 | * MPPE parameters. A CONFREJ is due to subsequent
|
---|
| 1226 | * (non-MPPE) processing.
|
---|
| 1227 | */
|
---|
| 1228 | rej_for_ci_mppe = 0;
|
---|
| 1229 | break;
|
---|
| 1230 | #endif /* MPPE_SUPPORT */
|
---|
| 1231 | #if DEFLATE_SUPPORT
|
---|
| 1232 | case CI_DEFLATE:
|
---|
| 1233 | case CI_DEFLATE_DRAFT:
|
---|
| 1234 | if (!ao->deflate || clen != CILEN_DEFLATE
|
---|
| 1235 | || (!ao->deflate_correct && type == CI_DEFLATE)
|
---|
| 1236 | || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
|
---|
| 1237 | newret = CONFREJ;
|
---|
| 1238 | break;
|
---|
| 1239 | }
|
---|
| 1240 |
|
---|
| 1241 | ho->deflate = 1;
|
---|
| 1242 | ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
|
---|
| 1243 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
---|
| 1244 | || p[3] != DEFLATE_CHK_SEQUENCE
|
---|
| 1245 | || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
|
---|
| 1246 | newret = CONFNAK;
|
---|
| 1247 | if (!dont_nak) {
|
---|
| 1248 | p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
|
---|
| 1249 | p[3] = DEFLATE_CHK_SEQUENCE;
|
---|
| 1250 | /* fall through to test this #bits below */
|
---|
| 1251 | } else
|
---|
| 1252 | break;
|
---|
| 1253 | }
|
---|
| 1254 |
|
---|
| 1255 | /*
|
---|
| 1256 | * Check whether we can do Deflate with the window
|
---|
| 1257 | * size they want. If the window is too big, reduce
|
---|
| 1258 | * it until the kernel can cope and nak with that.
|
---|
| 1259 | * We only check this for the first option.
|
---|
| 1260 | */
|
---|
| 1261 | if (p == p0) {
|
---|
| 1262 | for (;;) {
|
---|
| 1263 | res = ccp_test(pcb, p, CILEN_DEFLATE, 1);
|
---|
| 1264 | if (res > 0)
|
---|
| 1265 | break; /* it's OK now */
|
---|
| 1266 | if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
|
---|
| 1267 | newret = CONFREJ;
|
---|
| 1268 | p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
|
---|
| 1269 | break;
|
---|
| 1270 | }
|
---|
| 1271 | newret = CONFNAK;
|
---|
| 1272 | --nb;
|
---|
| 1273 | p[2] = DEFLATE_MAKE_OPT(nb);
|
---|
| 1274 | }
|
---|
| 1275 | }
|
---|
| 1276 | break;
|
---|
| 1277 | #endif /* DEFLATE_SUPPORT */
|
---|
| 1278 | #if BSDCOMPRESS_SUPPORT
|
---|
| 1279 | case CI_BSD_COMPRESS:
|
---|
| 1280 | if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
|
---|
| 1281 | newret = CONFREJ;
|
---|
| 1282 | break;
|
---|
| 1283 | }
|
---|
| 1284 |
|
---|
| 1285 | ho->bsd_compress = 1;
|
---|
| 1286 | ho->bsd_bits = nb = BSD_NBITS(p[2]);
|
---|
| 1287 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
|
---|
| 1288 | || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
|
---|
| 1289 | newret = CONFNAK;
|
---|
| 1290 | if (!dont_nak) {
|
---|
| 1291 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
|
---|
| 1292 | /* fall through to test this #bits below */
|
---|
| 1293 | } else
|
---|
| 1294 | break;
|
---|
| 1295 | }
|
---|
| 1296 |
|
---|
| 1297 | /*
|
---|
| 1298 | * Check whether we can do BSD-Compress with the code
|
---|
| 1299 | * size they want. If the code size is too big, reduce
|
---|
| 1300 | * it until the kernel can cope and nak with that.
|
---|
| 1301 | * We only check this for the first option.
|
---|
| 1302 | */
|
---|
| 1303 | if (p == p0) {
|
---|
| 1304 | for (;;) {
|
---|
| 1305 | res = ccp_test(pcb, p, CILEN_BSD_COMPRESS, 1);
|
---|
| 1306 | if (res > 0)
|
---|
| 1307 | break;
|
---|
| 1308 | if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
|
---|
| 1309 | newret = CONFREJ;
|
---|
| 1310 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
|
---|
| 1311 | ho->bsd_bits);
|
---|
| 1312 | break;
|
---|
| 1313 | }
|
---|
| 1314 | newret = CONFNAK;
|
---|
| 1315 | --nb;
|
---|
| 1316 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
|
---|
| 1317 | }
|
---|
| 1318 | }
|
---|
| 1319 | break;
|
---|
| 1320 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 1321 | #if PREDICTOR_SUPPORT
|
---|
| 1322 | case CI_PREDICTOR_1:
|
---|
| 1323 | if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
|
---|
| 1324 | newret = CONFREJ;
|
---|
| 1325 | break;
|
---|
| 1326 | }
|
---|
| 1327 |
|
---|
| 1328 | ho->predictor_1 = 1;
|
---|
| 1329 | if (p == p0
|
---|
| 1330 | && ccp_test(pcb, p, CILEN_PREDICTOR_1, 1) <= 0) {
|
---|
| 1331 | newret = CONFREJ;
|
---|
| 1332 | }
|
---|
| 1333 | break;
|
---|
| 1334 |
|
---|
| 1335 | case CI_PREDICTOR_2:
|
---|
| 1336 | if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
|
---|
| 1337 | newret = CONFREJ;
|
---|
| 1338 | break;
|
---|
| 1339 | }
|
---|
| 1340 |
|
---|
| 1341 | ho->predictor_2 = 1;
|
---|
| 1342 | if (p == p0
|
---|
| 1343 | && ccp_test(pcb, p, CILEN_PREDICTOR_2, 1) <= 0) {
|
---|
| 1344 | newret = CONFREJ;
|
---|
| 1345 | }
|
---|
| 1346 | break;
|
---|
| 1347 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 1348 |
|
---|
| 1349 | default:
|
---|
| 1350 | newret = CONFREJ;
|
---|
| 1351 | }
|
---|
| 1352 | }
|
---|
| 1353 |
|
---|
| 1354 | if (newret == CONFNAK && dont_nak)
|
---|
| 1355 | newret = CONFREJ;
|
---|
| 1356 | if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
|
---|
| 1357 | /* we're returning this option */
|
---|
| 1358 | if (newret == CONFREJ && ret == CONFNAK)
|
---|
| 1359 | retp = p0;
|
---|
| 1360 | ret = newret;
|
---|
| 1361 | if (p != retp)
|
---|
| 1362 | MEMCPY(retp, p, clen);
|
---|
| 1363 | retp += clen;
|
---|
| 1364 | }
|
---|
| 1365 |
|
---|
| 1366 | p += clen;
|
---|
| 1367 | len -= clen;
|
---|
| 1368 | }
|
---|
| 1369 |
|
---|
| 1370 | if (ret != CONFACK) {
|
---|
| 1371 | if (ret == CONFREJ && *lenp == retp - p0)
|
---|
| 1372 | pcb->ccp_all_rejected = 1;
|
---|
| 1373 | else
|
---|
| 1374 | *lenp = retp - p0;
|
---|
| 1375 | }
|
---|
| 1376 | #if MPPE_SUPPORT
|
---|
| 1377 | if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
|
---|
| 1378 | ppp_error("MPPE required but peer negotiation failed");
|
---|
| 1379 | lcp_close(pcb, "MPPE required but peer negotiation failed");
|
---|
| 1380 | }
|
---|
| 1381 | #endif /* MPPE_SUPPORT */
|
---|
| 1382 | return ret;
|
---|
| 1383 | }
|
---|
| 1384 |
|
---|
| 1385 | /*
|
---|
| 1386 | * Make a string name for a compression method (or 2).
|
---|
| 1387 | */
|
---|
| 1388 | static const char *method_name(ccp_options *opt, ccp_options *opt2) {
|
---|
| 1389 | static char result[64];
|
---|
| 1390 | #if !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT
|
---|
| 1391 | LWIP_UNUSED_ARG(opt2);
|
---|
| 1392 | #endif /* !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT */
|
---|
| 1393 |
|
---|
| 1394 | if (!ccp_anycompress(opt))
|
---|
| 1395 | return "(none)";
|
---|
| 1396 | switch (opt->method) {
|
---|
| 1397 | #if MPPE_SUPPORT
|
---|
| 1398 | case CI_MPPE:
|
---|
| 1399 | {
|
---|
| 1400 | char *p = result;
|
---|
| 1401 | char *q = result + sizeof(result); /* 1 past result */
|
---|
| 1402 |
|
---|
| 1403 | ppp_slprintf(p, q - p, "MPPE ");
|
---|
| 1404 | p += 5;
|
---|
| 1405 | if (opt->mppe & MPPE_OPT_128) {
|
---|
| 1406 | ppp_slprintf(p, q - p, "128-bit ");
|
---|
| 1407 | p += 8;
|
---|
| 1408 | }
|
---|
| 1409 | if (opt->mppe & MPPE_OPT_40) {
|
---|
| 1410 | ppp_slprintf(p, q - p, "40-bit ");
|
---|
| 1411 | p += 7;
|
---|
| 1412 | }
|
---|
| 1413 | if (opt->mppe & MPPE_OPT_STATEFUL)
|
---|
| 1414 | ppp_slprintf(p, q - p, "stateful");
|
---|
| 1415 | else
|
---|
| 1416 | ppp_slprintf(p, q - p, "stateless");
|
---|
| 1417 |
|
---|
| 1418 | break;
|
---|
| 1419 | }
|
---|
| 1420 | #endif /* MPPE_SUPPORT */
|
---|
| 1421 | #if DEFLATE_SUPPORT
|
---|
| 1422 | case CI_DEFLATE:
|
---|
| 1423 | case CI_DEFLATE_DRAFT:
|
---|
| 1424 | if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
|
---|
| 1425 | ppp_slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
|
---|
| 1426 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
|
---|
| 1427 | opt->deflate_size, opt2->deflate_size);
|
---|
| 1428 | else
|
---|
| 1429 | ppp_slprintf(result, sizeof(result), "Deflate%s (%d)",
|
---|
| 1430 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
|
---|
| 1431 | opt->deflate_size);
|
---|
| 1432 | break;
|
---|
| 1433 | #endif /* DEFLATE_SUPPORT */
|
---|
| 1434 | #if BSDCOMPRESS_SUPPORT
|
---|
| 1435 | case CI_BSD_COMPRESS:
|
---|
| 1436 | if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
|
---|
| 1437 | ppp_slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
|
---|
| 1438 | opt->bsd_bits, opt2->bsd_bits);
|
---|
| 1439 | else
|
---|
| 1440 | ppp_slprintf(result, sizeof(result), "BSD-Compress (%d)",
|
---|
| 1441 | opt->bsd_bits);
|
---|
| 1442 | break;
|
---|
| 1443 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 1444 | #if PREDICTOR_SUPPORT
|
---|
| 1445 | case CI_PREDICTOR_1:
|
---|
| 1446 | return "Predictor 1";
|
---|
| 1447 | case CI_PREDICTOR_2:
|
---|
| 1448 | return "Predictor 2";
|
---|
| 1449 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 1450 | default:
|
---|
| 1451 | ppp_slprintf(result, sizeof(result), "Method %d", opt->method);
|
---|
| 1452 | }
|
---|
| 1453 | return result;
|
---|
| 1454 | }
|
---|
| 1455 |
|
---|
| 1456 | /*
|
---|
| 1457 | * CCP has come up - inform the kernel driver and log a message.
|
---|
| 1458 | */
|
---|
| 1459 | static void ccp_up(fsm *f) {
|
---|
| 1460 | ppp_pcb *pcb = f->pcb;
|
---|
| 1461 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 1462 | ccp_options *ho = &pcb->ccp_hisoptions;
|
---|
| 1463 | char method1[64];
|
---|
| 1464 |
|
---|
| 1465 | ccp_set(pcb, 1, 1, go->method, ho->method);
|
---|
| 1466 | if (ccp_anycompress(go)) {
|
---|
| 1467 | if (ccp_anycompress(ho)) {
|
---|
| 1468 | if (go->method == ho->method) {
|
---|
| 1469 | ppp_notice("%s compression enabled", method_name(go, ho));
|
---|
| 1470 | } else {
|
---|
| 1471 | ppp_strlcpy(method1, method_name(go, NULL), sizeof(method1));
|
---|
| 1472 | ppp_notice("%s / %s compression enabled",
|
---|
| 1473 | method1, method_name(ho, NULL));
|
---|
| 1474 | }
|
---|
| 1475 | } else
|
---|
| 1476 | ppp_notice("%s receive compression enabled", method_name(go, NULL));
|
---|
| 1477 | } else if (ccp_anycompress(ho))
|
---|
| 1478 | ppp_notice("%s transmit compression enabled", method_name(ho, NULL));
|
---|
| 1479 | #if MPPE_SUPPORT
|
---|
| 1480 | if (go->mppe) {
|
---|
| 1481 | continue_networks(pcb); /* Bring up IP et al */
|
---|
| 1482 | }
|
---|
| 1483 | #endif /* MPPE_SUPPORT */
|
---|
| 1484 | }
|
---|
| 1485 |
|
---|
| 1486 | /*
|
---|
| 1487 | * CCP has gone down - inform the kernel driver.
|
---|
| 1488 | */
|
---|
| 1489 | static void ccp_down(fsm *f) {
|
---|
| 1490 | ppp_pcb *pcb = f->pcb;
|
---|
| 1491 | #if MPPE_SUPPORT
|
---|
| 1492 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 1493 | #endif /* MPPE_SUPPORT */
|
---|
| 1494 |
|
---|
| 1495 | if (pcb->ccp_localstate & RACK_PENDING)
|
---|
| 1496 | UNTIMEOUT(ccp_rack_timeout, f);
|
---|
| 1497 | pcb->ccp_localstate = 0;
|
---|
| 1498 | ccp_set(pcb, 1, 0, 0, 0);
|
---|
| 1499 | #if MPPE_SUPPORT
|
---|
| 1500 | if (go->mppe) {
|
---|
| 1501 | go->mppe = 0;
|
---|
| 1502 | if (pcb->lcp_fsm.state == PPP_FSM_OPENED) {
|
---|
| 1503 | /* If LCP is not already going down, make sure it does. */
|
---|
| 1504 | ppp_error("MPPE disabled");
|
---|
| 1505 | lcp_close(pcb, "MPPE disabled");
|
---|
| 1506 | }
|
---|
| 1507 | }
|
---|
| 1508 | #endif /* MPPE_SUPPORT */
|
---|
| 1509 | }
|
---|
| 1510 |
|
---|
| 1511 | #if PRINTPKT_SUPPORT
|
---|
| 1512 | /*
|
---|
| 1513 | * Print the contents of a CCP packet.
|
---|
| 1514 | */
|
---|
| 1515 | static const char* const ccp_codenames[] = {
|
---|
| 1516 | "ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
---|
| 1517 | "TermReq", "TermAck", "CodeRej",
|
---|
| 1518 | NULL, NULL, NULL, NULL, NULL, NULL,
|
---|
| 1519 | "ResetReq", "ResetAck",
|
---|
| 1520 | };
|
---|
| 1521 |
|
---|
| 1522 | static int ccp_printpkt(const u_char *p, int plen, void (*printer) (void *, const char *, ...), void *arg) {
|
---|
| 1523 | const u_char *p0, *optend;
|
---|
| 1524 | int code, id, len;
|
---|
| 1525 | int optlen;
|
---|
| 1526 |
|
---|
| 1527 | p0 = p;
|
---|
| 1528 | if (plen < HEADERLEN)
|
---|
| 1529 | return 0;
|
---|
| 1530 | code = p[0];
|
---|
| 1531 | id = p[1];
|
---|
| 1532 | len = (p[2] << 8) + p[3];
|
---|
| 1533 | if (len < HEADERLEN || len > plen)
|
---|
| 1534 | return 0;
|
---|
| 1535 |
|
---|
| 1536 | if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ccp_codenames) && ccp_codenames[code-1] != NULL)
|
---|
| 1537 | printer(arg, " %s", ccp_codenames[code-1]);
|
---|
| 1538 | else
|
---|
| 1539 | printer(arg, " code=0x%x", code);
|
---|
| 1540 | printer(arg, " id=0x%x", id);
|
---|
| 1541 | len -= HEADERLEN;
|
---|
| 1542 | p += HEADERLEN;
|
---|
| 1543 |
|
---|
| 1544 | switch (code) {
|
---|
| 1545 | case CONFREQ:
|
---|
| 1546 | case CONFACK:
|
---|
| 1547 | case CONFNAK:
|
---|
| 1548 | case CONFREJ:
|
---|
| 1549 | /* print list of possible compression methods */
|
---|
| 1550 | while (len >= 2) {
|
---|
| 1551 | code = p[0];
|
---|
| 1552 | optlen = p[1];
|
---|
| 1553 | if (optlen < 2 || optlen > len)
|
---|
| 1554 | break;
|
---|
| 1555 | printer(arg, " <");
|
---|
| 1556 | len -= optlen;
|
---|
| 1557 | optend = p + optlen;
|
---|
| 1558 | switch (code) {
|
---|
| 1559 | #if MPPE_SUPPORT
|
---|
| 1560 | case CI_MPPE:
|
---|
| 1561 | if (optlen >= CILEN_MPPE) {
|
---|
| 1562 | u_char mppe_opts;
|
---|
| 1563 |
|
---|
| 1564 | MPPE_CI_TO_OPTS(&p[2], mppe_opts);
|
---|
| 1565 | printer(arg, "mppe %s %s %s %s %s %s%s",
|
---|
| 1566 | (p[2] & MPPE_H_BIT)? "+H": "-H",
|
---|
| 1567 | (p[5] & MPPE_M_BIT)? "+M": "-M",
|
---|
| 1568 | (p[5] & MPPE_S_BIT)? "+S": "-S",
|
---|
| 1569 | (p[5] & MPPE_L_BIT)? "+L": "-L",
|
---|
| 1570 | (p[5] & MPPE_D_BIT)? "+D": "-D",
|
---|
| 1571 | (p[5] & MPPE_C_BIT)? "+C": "-C",
|
---|
| 1572 | (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
|
---|
| 1573 | if (mppe_opts & MPPE_OPT_UNKNOWN)
|
---|
| 1574 | printer(arg, " (%.2x %.2x %.2x %.2x)",
|
---|
| 1575 | p[2], p[3], p[4], p[5]);
|
---|
| 1576 | p += CILEN_MPPE;
|
---|
| 1577 | }
|
---|
| 1578 | break;
|
---|
| 1579 | #endif /* MPPE_SUPPORT */
|
---|
| 1580 | #if DEFLATE_SUPPORT
|
---|
| 1581 | case CI_DEFLATE:
|
---|
| 1582 | case CI_DEFLATE_DRAFT:
|
---|
| 1583 | if (optlen >= CILEN_DEFLATE) {
|
---|
| 1584 | printer(arg, "deflate%s %d",
|
---|
| 1585 | (code == CI_DEFLATE_DRAFT? "(old#)": ""),
|
---|
| 1586 | DEFLATE_SIZE(p[2]));
|
---|
| 1587 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
|
---|
| 1588 | printer(arg, " method %d", DEFLATE_METHOD(p[2]));
|
---|
| 1589 | if (p[3] != DEFLATE_CHK_SEQUENCE)
|
---|
| 1590 | printer(arg, " check %d", p[3]);
|
---|
| 1591 | p += CILEN_DEFLATE;
|
---|
| 1592 | }
|
---|
| 1593 | break;
|
---|
| 1594 | #endif /* DEFLATE_SUPPORT */
|
---|
| 1595 | #if BSDCOMPRESS_SUPPORT
|
---|
| 1596 | case CI_BSD_COMPRESS:
|
---|
| 1597 | if (optlen >= CILEN_BSD_COMPRESS) {
|
---|
| 1598 | printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
|
---|
| 1599 | BSD_NBITS(p[2]));
|
---|
| 1600 | p += CILEN_BSD_COMPRESS;
|
---|
| 1601 | }
|
---|
| 1602 | break;
|
---|
| 1603 | #endif /* BSDCOMPRESS_SUPPORT */
|
---|
| 1604 | #if PREDICTOR_SUPPORT
|
---|
| 1605 | case CI_PREDICTOR_1:
|
---|
| 1606 | if (optlen >= CILEN_PREDICTOR_1) {
|
---|
| 1607 | printer(arg, "predictor 1");
|
---|
| 1608 | p += CILEN_PREDICTOR_1;
|
---|
| 1609 | }
|
---|
| 1610 | break;
|
---|
| 1611 | case CI_PREDICTOR_2:
|
---|
| 1612 | if (optlen >= CILEN_PREDICTOR_2) {
|
---|
| 1613 | printer(arg, "predictor 2");
|
---|
| 1614 | p += CILEN_PREDICTOR_2;
|
---|
| 1615 | }
|
---|
| 1616 | break;
|
---|
| 1617 | #endif /* PREDICTOR_SUPPORT */
|
---|
| 1618 | default:
|
---|
| 1619 | break;
|
---|
| 1620 | }
|
---|
| 1621 | while (p < optend)
|
---|
| 1622 | printer(arg, " %.2x", *p++);
|
---|
| 1623 | printer(arg, ">");
|
---|
| 1624 | }
|
---|
| 1625 | break;
|
---|
| 1626 |
|
---|
| 1627 | case TERMACK:
|
---|
| 1628 | case TERMREQ:
|
---|
| 1629 | if (len > 0 && *p >= ' ' && *p < 0x7f) {
|
---|
| 1630 | ppp_print_string(p, len, printer, arg);
|
---|
| 1631 | p += len;
|
---|
| 1632 | len = 0;
|
---|
| 1633 | }
|
---|
| 1634 | break;
|
---|
| 1635 | default:
|
---|
| 1636 | break;
|
---|
| 1637 | }
|
---|
| 1638 |
|
---|
| 1639 | /* dump out the rest of the packet in hex */
|
---|
| 1640 | while (--len >= 0)
|
---|
| 1641 | printer(arg, " %.2x", *p++);
|
---|
| 1642 |
|
---|
| 1643 | return p - p0;
|
---|
| 1644 | }
|
---|
| 1645 | #endif /* PRINTPKT_SUPPORT */
|
---|
| 1646 |
|
---|
| 1647 | #if PPP_DATAINPUT
|
---|
| 1648 | /*
|
---|
| 1649 | * We have received a packet that the decompressor failed to
|
---|
| 1650 | * decompress. Here we would expect to issue a reset-request, but
|
---|
| 1651 | * Motorola has a patent on resetting the compressor as a result of
|
---|
| 1652 | * detecting an error in the decompressed data after decompression.
|
---|
| 1653 | * (See US patent 5,130,993; international patent publication number
|
---|
| 1654 | * WO 91/10289; Australian patent 73296/91.)
|
---|
| 1655 | *
|
---|
| 1656 | * So we ask the kernel whether the error was detected after
|
---|
| 1657 | * decompression; if it was, we take CCP down, thus disabling
|
---|
| 1658 | * compression :-(, otherwise we issue the reset-request.
|
---|
| 1659 | */
|
---|
| 1660 | static void ccp_datainput(ppp_pcb *pcb, u_char *pkt, int len) {
|
---|
| 1661 | fsm *f;
|
---|
| 1662 | #if MPPE_SUPPORT
|
---|
| 1663 | ccp_options *go = &pcb->ccp_gotoptions;
|
---|
| 1664 | #endif /* MPPE_SUPPORT */
|
---|
| 1665 | LWIP_UNUSED_ARG(pkt);
|
---|
| 1666 | LWIP_UNUSED_ARG(len);
|
---|
| 1667 |
|
---|
| 1668 | f = &pcb->ccp_fsm;
|
---|
| 1669 | if (f->state == PPP_FSM_OPENED) {
|
---|
| 1670 | if (ccp_fatal_error(pcb)) {
|
---|
| 1671 | /*
|
---|
| 1672 | * Disable compression by taking CCP down.
|
---|
| 1673 | */
|
---|
| 1674 | ppp_error("Lost compression sync: disabling compression");
|
---|
| 1675 | ccp_close(pcb, "Lost compression sync");
|
---|
| 1676 | #if MPPE_SUPPORT
|
---|
| 1677 | /*
|
---|
| 1678 | * If we were doing MPPE, we must also take the link down.
|
---|
| 1679 | */
|
---|
| 1680 | if (go->mppe) {
|
---|
| 1681 | ppp_error("Too many MPPE errors, closing LCP");
|
---|
| 1682 | lcp_close(pcb, "Too many MPPE errors");
|
---|
| 1683 | }
|
---|
| 1684 | #endif /* MPPE_SUPPORT */
|
---|
| 1685 | } else {
|
---|
| 1686 | /*
|
---|
| 1687 | * Send a reset-request to reset the peer's compressor.
|
---|
| 1688 | * We don't do that if we are still waiting for an
|
---|
| 1689 | * acknowledgement to a previous reset-request.
|
---|
| 1690 | */
|
---|
| 1691 | if (!(pcb->ccp_localstate & RACK_PENDING)) {
|
---|
| 1692 | fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
|
---|
| 1693 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
|
---|
| 1694 | pcb->ccp_localstate |= RACK_PENDING;
|
---|
| 1695 | } else
|
---|
| 1696 | pcb->ccp_localstate |= RREQ_REPEAT;
|
---|
| 1697 | }
|
---|
| 1698 | }
|
---|
| 1699 | }
|
---|
| 1700 | #endif /* PPP_DATAINPUT */
|
---|
| 1701 |
|
---|
| 1702 | /*
|
---|
| 1703 | * We have received a packet that the decompressor failed to
|
---|
| 1704 | * decompress. Issue a reset-request.
|
---|
| 1705 | */
|
---|
| 1706 | void ccp_resetrequest(ppp_pcb *pcb) {
|
---|
| 1707 | fsm *f = &pcb->ccp_fsm;
|
---|
| 1708 |
|
---|
| 1709 | if (f->state != PPP_FSM_OPENED)
|
---|
| 1710 | return;
|
---|
| 1711 |
|
---|
| 1712 | /*
|
---|
| 1713 | * Send a reset-request to reset the peer's compressor.
|
---|
| 1714 | * We don't do that if we are still waiting for an
|
---|
| 1715 | * acknowledgement to a previous reset-request.
|
---|
| 1716 | */
|
---|
| 1717 | if (!(pcb->ccp_localstate & RACK_PENDING)) {
|
---|
| 1718 | fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
|
---|
| 1719 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
|
---|
| 1720 | pcb->ccp_localstate |= RACK_PENDING;
|
---|
| 1721 | } else
|
---|
| 1722 | pcb->ccp_localstate |= RREQ_REPEAT;
|
---|
| 1723 | }
|
---|
| 1724 |
|
---|
| 1725 | /*
|
---|
| 1726 | * Timeout waiting for reset-ack.
|
---|
| 1727 | */
|
---|
| 1728 | static void ccp_rack_timeout(void *arg) {
|
---|
| 1729 | fsm *f = (fsm*)arg;
|
---|
| 1730 | ppp_pcb *pcb = f->pcb;
|
---|
| 1731 |
|
---|
| 1732 | if (f->state == PPP_FSM_OPENED && (pcb->ccp_localstate & RREQ_REPEAT)) {
|
---|
| 1733 | fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
|
---|
| 1734 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
|
---|
| 1735 | pcb->ccp_localstate &= ~RREQ_REPEAT;
|
---|
| 1736 | } else
|
---|
| 1737 | pcb->ccp_localstate &= ~RACK_PENDING;
|
---|
| 1738 | }
|
---|
| 1739 |
|
---|
| 1740 | #endif /* PPP_SUPPORT && CCP_SUPPORT */
|
---|