Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /***************************************************************************** |
| 2 | * ipcp.c - Network PPP IP Control Protocol program file. |
| 3 | * |
| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. |
| 5 | * portions Copyright (c) 1997 by Global Election Systems Inc. |
| 6 | * |
| 7 | * The authors hereby grant permission to use, copy, modify, distribute, |
| 8 | * and license this software and its documentation for any purpose, provided |
| 9 | * that existing copyright notices are retained in all copies and that this |
| 10 | * notice and the following disclaimer are included verbatim in any |
| 11 | * distributions. No written agreement, license, or royalty fee is required |
| 12 | * for any of the authorized uses. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | * |
| 25 | ****************************************************************************** |
| 26 | * REVISION HISTORY |
| 27 | * |
| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca> |
| 29 | * Ported to lwIP. |
| 30 | * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc. |
| 31 | * Original. |
| 32 | *****************************************************************************/ |
| 33 | /* |
| 34 | * ipcp.c - PPP IP Control Protocol. |
| 35 | * |
| 36 | * Copyright (c) 1989 Carnegie Mellon University. |
| 37 | * All rights reserved. |
| 38 | * |
| 39 | * Redistribution and use in source and binary forms are permitted |
| 40 | * provided that the above copyright notice and this paragraph are |
| 41 | * duplicated in all such forms and that any documentation, |
| 42 | * advertising materials, and other materials related to such |
| 43 | * distribution and use acknowledge that the software was developed |
| 44 | * by Carnegie Mellon University. The name of the |
| 45 | * University may not be used to endorse or promote products derived |
| 46 | * from this software without specific prior written permission. |
| 47 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 48 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 49 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 50 | */ |
| 51 | |
| 52 | #include <string.h> |
| 53 | |
| 54 | #include "ppp.h" |
| 55 | #if PPP_SUPPORT > 0 |
| 56 | #include "auth.h" |
| 57 | #include "fsm.h" |
| 58 | #include "vj.h" |
| 59 | #include "ipcp.h" |
| 60 | #include "pppdebug.h" |
| 61 | |
| 62 | |
| 63 | /*************************/ |
| 64 | /*** LOCAL DEFINITIONS ***/ |
| 65 | /*************************/ |
| 66 | /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */ |
| 67 | |
| 68 | /* |
| 69 | * Lengths of configuration options. |
| 70 | */ |
| 71 | #define CILEN_VOID 2 |
| 72 | #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ |
| 73 | #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ |
| 74 | #define CILEN_ADDR 6 /* new-style single address option */ |
| 75 | #define CILEN_ADDRS 10 /* old-style dual address option */ |
| 76 | |
| 77 | |
| 78 | |
| 79 | /***********************************/ |
| 80 | /*** LOCAL FUNCTION DECLARATIONS ***/ |
| 81 | /***********************************/ |
| 82 | /* |
| 83 | * Callbacks for fsm code. (CI = Configuration Information) |
| 84 | */ |
| 85 | static void ipcp_resetci (fsm *); /* Reset our CI */ |
| 86 | static int ipcp_cilen (fsm *); /* Return length of our CI */ |
| 87 | static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */ |
| 88 | static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */ |
| 89 | static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */ |
| 90 | static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */ |
| 91 | static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */ |
| 92 | static void ipcp_up (fsm *); /* We're UP */ |
| 93 | static void ipcp_down (fsm *); /* We're DOWN */ |
| 94 | #if 0 |
| 95 | static void ipcp_script (fsm *, char *); /* Run an up/down script */ |
| 96 | #endif |
| 97 | static void ipcp_finished (fsm *); /* Don't need lower layer */ |
| 98 | |
| 99 | /* |
| 100 | * Protocol entry points from main code. |
| 101 | */ |
| 102 | static void ipcp_init (int); |
| 103 | static void ipcp_open (int); |
| 104 | static void ipcp_close (int, char *); |
| 105 | static void ipcp_lowerup (int); |
| 106 | static void ipcp_lowerdown (int); |
| 107 | static void ipcp_input (int, u_char *, int); |
| 108 | static void ipcp_protrej (int); |
| 109 | |
| 110 | static void ipcp_clear_addrs (int); |
| 111 | |
| 112 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
| 113 | (x) == CONFNAK ? "NAK" : "REJ") |
| 114 | |
| 115 | |
| 116 | |
| 117 | /******************************/ |
| 118 | /*** PUBLIC DATA STRUCTURES ***/ |
| 119 | /******************************/ |
| 120 | /* global vars */ |
| 121 | ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ |
| 122 | ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ |
| 123 | ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ |
| 124 | ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ |
| 125 | |
| 126 | fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ |
| 127 | |
| 128 | struct protent ipcp_protent = { |
| 129 | PPP_IPCP, |
| 130 | ipcp_init, |
| 131 | ipcp_input, |
| 132 | ipcp_protrej, |
| 133 | ipcp_lowerup, |
| 134 | ipcp_lowerdown, |
| 135 | ipcp_open, |
| 136 | ipcp_close, |
| 137 | #if 0 |
| 138 | ipcp_printpkt, |
| 139 | NULL, |
| 140 | #endif |
| 141 | 1, |
| 142 | "IPCP", |
| 143 | #if 0 |
| 144 | ip_check_options, |
| 145 | NULL, |
| 146 | ip_active_pkt |
| 147 | #endif |
| 148 | }; |
| 149 | |
| 150 | |
| 151 | |
| 152 | /*****************************/ |
| 153 | /*** LOCAL DATA STRUCTURES ***/ |
| 154 | /*****************************/ |
| 155 | /* local vars */ |
| 156 | static int cis_received[NUM_PPP]; /* # Conf-Reqs received */ |
| 157 | static int default_route_set[NUM_PPP]; /* Have set up a default route */ |
| 158 | |
| 159 | static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ |
| 160 | ipcp_resetci, /* Reset our Configuration Information */ |
| 161 | ipcp_cilen, /* Length of our Configuration Information */ |
| 162 | ipcp_addci, /* Add our Configuration Information */ |
| 163 | ipcp_ackci, /* ACK our Configuration Information */ |
| 164 | ipcp_nakci, /* NAK our Configuration Information */ |
| 165 | ipcp_rejci, /* Reject our Configuration Information */ |
| 166 | ipcp_reqci, /* Request peer's Configuration Information */ |
| 167 | ipcp_up, /* Called when fsm reaches OPENED state */ |
| 168 | ipcp_down, /* Called when fsm leaves OPENED state */ |
| 169 | NULL, /* Called when we want the lower layer up */ |
| 170 | ipcp_finished, /* Called when we want the lower layer down */ |
| 171 | NULL, /* Called when Protocol-Reject received */ |
| 172 | NULL, /* Retransmission is necessary */ |
| 173 | NULL, /* Called to handle protocol-specific codes */ |
| 174 | "IPCP" /* String name of protocol */ |
| 175 | }; |
| 176 | |
| 177 | |
| 178 | |
| 179 | /**********************************/ |
| 180 | /*** LOCAL FUNCTION DEFINITIONS ***/ |
| 181 | /**********************************/ |
| 182 | |
| 183 | /* |
| 184 | * Non-standard inet_ntoa left here for compat with original ppp |
| 185 | * sources. Assumes u32_t instead of struct in_addr. |
| 186 | */ |
| 187 | |
| 188 | char * _inet_ntoa(u32_t n) |
| 189 | { |
| 190 | struct in_addr ia; |
| 191 | ia.s_addr = n; |
| 192 | return inet_ntoa(ia); |
| 193 | } |
| 194 | |
| 195 | #define inet_ntoa _inet_ntoa |
| 196 | |
| 197 | /* |
| 198 | * ipcp_init - Initialize IPCP. |
| 199 | */ |
| 200 | static void ipcp_init(int unit) |
| 201 | { |
| 202 | fsm *f = &ipcp_fsm[unit]; |
| 203 | ipcp_options *wo = &ipcp_wantoptions[unit]; |
| 204 | ipcp_options *ao = &ipcp_allowoptions[unit]; |
| 205 | |
| 206 | f->unit = unit; |
| 207 | f->protocol = PPP_IPCP; |
| 208 | f->callbacks = &ipcp_callbacks; |
| 209 | fsm_init(&ipcp_fsm[unit]); |
| 210 | |
| 211 | memset(wo, 0, sizeof(*wo)); |
| 212 | memset(ao, 0, sizeof(*ao)); |
| 213 | |
| 214 | wo->neg_addr = 1; |
| 215 | wo->ouraddr = 0; |
| 216 | #if VJ_SUPPORT > 0 |
| 217 | wo->neg_vj = 1; |
| 218 | #else |
| 219 | wo->neg_vj = 0; |
| 220 | #endif |
| 221 | wo->vj_protocol = IPCP_VJ_COMP; |
| 222 | wo->maxslotindex = MAX_SLOTS - 1; |
| 223 | wo->cflag = 0; |
| 224 | |
| 225 | wo->default_route = 1; |
| 226 | |
| 227 | ao->neg_addr = 1; |
| 228 | #if VJ_SUPPORT > 0 |
| 229 | ao->neg_vj = 1; |
| 230 | #else |
| 231 | ao->neg_vj = 0; |
| 232 | #endif |
| 233 | ao->maxslotindex = MAX_SLOTS - 1; |
| 234 | ao->cflag = 1; |
| 235 | |
| 236 | ao->default_route = 1; |
| 237 | } |
| 238 | |
| 239 | |
| 240 | /* |
| 241 | * ipcp_open - IPCP is allowed to come up. |
| 242 | */ |
| 243 | static void ipcp_open(int unit) |
| 244 | { |
| 245 | fsm_open(&ipcp_fsm[unit]); |
| 246 | } |
| 247 | |
| 248 | |
| 249 | /* |
| 250 | * ipcp_close - Take IPCP down. |
| 251 | */ |
| 252 | static void ipcp_close(int unit, char *reason) |
| 253 | { |
| 254 | fsm_close(&ipcp_fsm[unit], reason); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | /* |
| 259 | * ipcp_lowerup - The lower layer is up. |
| 260 | */ |
| 261 | static void ipcp_lowerup(int unit) |
| 262 | { |
| 263 | fsm_lowerup(&ipcp_fsm[unit]); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | /* |
| 268 | * ipcp_lowerdown - The lower layer is down. |
| 269 | */ |
| 270 | static void ipcp_lowerdown(int unit) |
| 271 | { |
| 272 | fsm_lowerdown(&ipcp_fsm[unit]); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* |
| 277 | * ipcp_input - Input IPCP packet. |
| 278 | */ |
| 279 | static void ipcp_input(int unit, u_char *p, int len) |
| 280 | { |
| 281 | fsm_input(&ipcp_fsm[unit], p, len); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | /* |
| 286 | * ipcp_protrej - A Protocol-Reject was received for IPCP. |
| 287 | * |
| 288 | * Pretend the lower layer went down, so we shut up. |
| 289 | */ |
| 290 | static void ipcp_protrej(int unit) |
| 291 | { |
| 292 | fsm_lowerdown(&ipcp_fsm[unit]); |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /* |
| 297 | * ipcp_resetci - Reset our CI. |
| 298 | */ |
| 299 | static void ipcp_resetci(fsm *f) |
| 300 | { |
| 301 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| 302 | |
| 303 | wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr; |
| 304 | if (wo->ouraddr == 0) |
| 305 | wo->accept_local = 1; |
| 306 | if (wo->hisaddr == 0) |
| 307 | wo->accept_remote = 1; |
| 308 | /* Request DNS addresses from the peer */ |
| 309 | wo->req_dns1 = ppp_settings.usepeerdns; |
| 310 | wo->req_dns2 = ppp_settings.usepeerdns; |
| 311 | ipcp_gotoptions[f->unit] = *wo; |
| 312 | cis_received[f->unit] = 0; |
| 313 | } |
| 314 | |
| 315 | |
| 316 | /* |
| 317 | * ipcp_cilen - Return length of our CI. |
| 318 | */ |
| 319 | static int ipcp_cilen(fsm *f) |
| 320 | { |
| 321 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 322 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| 323 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| 324 | |
| 325 | #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) |
| 326 | #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0) |
| 327 | #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0) |
| 328 | |
| 329 | /* |
| 330 | * First see if we want to change our options to the old |
| 331 | * forms because we have received old forms from the peer. |
| 332 | */ |
| 333 | if (wo->neg_addr && !go->neg_addr && !go->old_addrs) { |
| 334 | /* use the old style of address negotiation */ |
| 335 | go->neg_addr = 1; |
| 336 | go->old_addrs = 1; |
| 337 | } |
| 338 | if (wo->neg_vj && !go->neg_vj && !go->old_vj) { |
| 339 | /* try an older style of VJ negotiation */ |
| 340 | if (cis_received[f->unit] == 0) { |
| 341 | /* keep trying the new style until we see some CI from the peer */ |
| 342 | go->neg_vj = 1; |
| 343 | } else { |
| 344 | /* use the old style only if the peer did */ |
| 345 | if (ho->neg_vj && ho->old_vj) { |
| 346 | go->neg_vj = 1; |
| 347 | go->old_vj = 1; |
| 348 | go->vj_protocol = ho->vj_protocol; |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | return (LENCIADDR(go->neg_addr, go->old_addrs) |
| 354 | + LENCIVJ(go->neg_vj, go->old_vj) + |
| 355 | LENCIDNS(go->req_dns1) + |
| 356 | LENCIDNS(go->req_dns2)); |
| 357 | } |
| 358 | |
| 359 | |
| 360 | /* |
| 361 | * ipcp_addci - Add our desired CIs to a packet. |
| 362 | */ |
| 363 | static void ipcp_addci(fsm *f, u_char *ucp, int *lenp) |
| 364 | { |
| 365 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 366 | int len = *lenp; |
| 367 | |
| 368 | #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
| 369 | if (neg) { \ |
| 370 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
| 371 | if (len >= vjlen) { \ |
| 372 | PUTCHAR(opt, ucp); \ |
| 373 | PUTCHAR(vjlen, ucp); \ |
| 374 | PUTSHORT(val, ucp); \ |
| 375 | if (!old) { \ |
| 376 | PUTCHAR(maxslotindex, ucp); \ |
| 377 | PUTCHAR(cflag, ucp); \ |
| 378 | } \ |
| 379 | len -= vjlen; \ |
| 380 | } else \ |
| 381 | neg = 0; \ |
| 382 | } |
| 383 | |
| 384 | #define ADDCIADDR(opt, neg, old, val1, val2) \ |
| 385 | if (neg) { \ |
| 386 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
| 387 | if (len >= addrlen) { \ |
| 388 | u32_t l; \ |
| 389 | PUTCHAR(opt, ucp); \ |
| 390 | PUTCHAR(addrlen, ucp); \ |
| 391 | l = ntohl(val1); \ |
| 392 | PUTLONG(l, ucp); \ |
| 393 | if (old) { \ |
| 394 | l = ntohl(val2); \ |
| 395 | PUTLONG(l, ucp); \ |
| 396 | } \ |
| 397 | len -= addrlen; \ |
| 398 | } else \ |
| 399 | neg = 0; \ |
| 400 | } |
| 401 | |
| 402 | #define ADDCIDNS(opt, neg, addr) \ |
| 403 | if (neg) { \ |
| 404 | if (len >= CILEN_ADDR) { \ |
| 405 | u32_t l; \ |
| 406 | PUTCHAR(opt, ucp); \ |
| 407 | PUTCHAR(CILEN_ADDR, ucp); \ |
| 408 | l = ntohl(addr); \ |
| 409 | PUTLONG(l, ucp); \ |
| 410 | len -= CILEN_ADDR; \ |
| 411 | } else \ |
| 412 | neg = 0; \ |
| 413 | } |
| 414 | |
| 415 | ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
| 416 | go->old_addrs, go->ouraddr, go->hisaddr); |
| 417 | |
| 418 | ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
| 419 | go->maxslotindex, go->cflag); |
| 420 | |
| 421 | ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); |
| 422 | |
| 423 | ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); |
| 424 | |
| 425 | *lenp -= len; |
| 426 | } |
| 427 | |
| 428 | |
| 429 | /* |
| 430 | * ipcp_ackci - Ack our CIs. |
| 431 | * |
| 432 | * Returns: |
| 433 | * 0 - Ack was bad. |
| 434 | * 1 - Ack was good. |
| 435 | */ |
| 436 | static int ipcp_ackci(fsm *f, u_char *p, int len) |
| 437 | { |
| 438 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 439 | u_short cilen, citype, cishort; |
| 440 | u32_t cilong; |
| 441 | u_char cimaxslotindex, cicflag; |
| 442 | |
| 443 | /* |
| 444 | * CIs must be in exactly the same order that we sent... |
| 445 | * Check packet length and CI length at each step. |
| 446 | * If we find any deviations, then this packet is bad. |
| 447 | */ |
| 448 | |
| 449 | #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
| 450 | if (neg) { \ |
| 451 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
| 452 | if ((len -= vjlen) < 0) \ |
| 453 | goto bad; \ |
| 454 | GETCHAR(citype, p); \ |
| 455 | GETCHAR(cilen, p); \ |
| 456 | if (cilen != vjlen || \ |
| 457 | citype != opt) \ |
| 458 | goto bad; \ |
| 459 | GETSHORT(cishort, p); \ |
| 460 | if (cishort != val) \ |
| 461 | goto bad; \ |
| 462 | if (!old) { \ |
| 463 | GETCHAR(cimaxslotindex, p); \ |
| 464 | if (cimaxslotindex != maxslotindex) \ |
| 465 | goto bad; \ |
| 466 | GETCHAR(cicflag, p); \ |
| 467 | if (cicflag != cflag) \ |
| 468 | goto bad; \ |
| 469 | } \ |
| 470 | } |
| 471 | |
| 472 | #define ACKCIADDR(opt, neg, old, val1, val2) \ |
| 473 | if (neg) { \ |
| 474 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
| 475 | u32_t l; \ |
| 476 | if ((len -= addrlen) < 0) \ |
| 477 | goto bad; \ |
| 478 | GETCHAR(citype, p); \ |
| 479 | GETCHAR(cilen, p); \ |
| 480 | if (cilen != addrlen || \ |
| 481 | citype != opt) \ |
| 482 | goto bad; \ |
| 483 | GETLONG(l, p); \ |
| 484 | cilong = htonl(l); \ |
| 485 | if (val1 != cilong) \ |
| 486 | goto bad; \ |
| 487 | if (old) { \ |
| 488 | GETLONG(l, p); \ |
| 489 | cilong = htonl(l); \ |
| 490 | if (val2 != cilong) \ |
| 491 | goto bad; \ |
| 492 | } \ |
| 493 | } |
| 494 | |
| 495 | #define ACKCIDNS(opt, neg, addr) \ |
| 496 | if (neg) { \ |
| 497 | u32_t l; \ |
| 498 | if ((len -= CILEN_ADDR) < 0) \ |
| 499 | goto bad; \ |
| 500 | GETCHAR(citype, p); \ |
| 501 | GETCHAR(cilen, p); \ |
| 502 | if (cilen != CILEN_ADDR || \ |
| 503 | citype != opt) \ |
| 504 | goto bad; \ |
| 505 | GETLONG(l, p); \ |
| 506 | cilong = htonl(l); \ |
| 507 | if (addr != cilong) \ |
| 508 | goto bad; \ |
| 509 | } |
| 510 | |
| 511 | ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
| 512 | go->old_addrs, go->ouraddr, go->hisaddr); |
| 513 | |
| 514 | ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
| 515 | go->maxslotindex, go->cflag); |
| 516 | |
| 517 | ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); |
| 518 | |
| 519 | ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); |
| 520 | |
| 521 | /* |
| 522 | * If there are any remaining CIs, then this packet is bad. |
| 523 | */ |
| 524 | if (len != 0) |
| 525 | goto bad; |
| 526 | return (1); |
| 527 | |
| 528 | bad: |
| 529 | IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!\n")); |
| 530 | return (0); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * ipcp_nakci - Peer has sent a NAK for some of our CIs. |
| 535 | * This should not modify any state if the Nak is bad |
| 536 | * or if IPCP is in the OPENED state. |
| 537 | * |
| 538 | * Returns: |
| 539 | * 0 - Nak was bad. |
| 540 | * 1 - Nak was good. |
| 541 | */ |
| 542 | static int ipcp_nakci(fsm *f, u_char *p, int len) |
| 543 | { |
| 544 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 545 | u_char cimaxslotindex, cicflag; |
| 546 | u_char citype, cilen, *next; |
| 547 | u_short cishort; |
| 548 | u32_t ciaddr1, ciaddr2, l, cidnsaddr; |
| 549 | ipcp_options no; /* options we've seen Naks for */ |
| 550 | ipcp_options try; /* options to request next time */ |
| 551 | |
| 552 | BZERO(&no, sizeof(no)); |
| 553 | try = *go; |
| 554 | |
| 555 | /* |
| 556 | * Any Nak'd CIs must be in exactly the same order that we sent. |
| 557 | * Check packet length and CI length at each step. |
| 558 | * If we find any deviations, then this packet is bad. |
| 559 | */ |
| 560 | #define NAKCIADDR(opt, neg, old, code) \ |
| 561 | if (go->neg && \ |
| 562 | len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \ |
| 563 | p[1] == cilen && \ |
| 564 | p[0] == opt) { \ |
| 565 | len -= cilen; \ |
| 566 | INCPTR(2, p); \ |
| 567 | GETLONG(l, p); \ |
| 568 | ciaddr1 = htonl(l); \ |
| 569 | if (old) { \ |
| 570 | GETLONG(l, p); \ |
| 571 | ciaddr2 = htonl(l); \ |
| 572 | no.old_addrs = 1; \ |
| 573 | } else \ |
| 574 | ciaddr2 = 0; \ |
| 575 | no.neg = 1; \ |
| 576 | code \ |
| 577 | } |
| 578 | |
| 579 | #define NAKCIVJ(opt, neg, code) \ |
| 580 | if (go->neg && \ |
| 581 | ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ |
| 582 | len >= cilen && \ |
| 583 | p[0] == opt) { \ |
| 584 | len -= cilen; \ |
| 585 | INCPTR(2, p); \ |
| 586 | GETSHORT(cishort, p); \ |
| 587 | no.neg = 1; \ |
| 588 | code \ |
| 589 | } |
| 590 | |
| 591 | #define NAKCIDNS(opt, neg, code) \ |
| 592 | if (go->neg && \ |
| 593 | ((cilen = p[1]) == CILEN_ADDR) && \ |
| 594 | len >= cilen && \ |
| 595 | p[0] == opt) { \ |
| 596 | len -= cilen; \ |
| 597 | INCPTR(2, p); \ |
| 598 | GETLONG(l, p); \ |
| 599 | cidnsaddr = htonl(l); \ |
| 600 | no.neg = 1; \ |
| 601 | code \ |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Accept the peer's idea of {our,his} address, if different |
| 606 | * from our idea, only if the accept_{local,remote} flag is set. |
| 607 | */ |
| 608 | NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs, |
| 609 | if (go->accept_local && ciaddr1) { /* Do we know our address? */ |
| 610 | try.ouraddr = ciaddr1; |
| 611 | IPCPDEBUG((LOG_INFO, "local IP address %s\n", |
| 612 | inet_ntoa(ciaddr1))); |
| 613 | } |
| 614 | if (go->accept_remote && ciaddr2) { /* Does he know his? */ |
| 615 | try.hisaddr = ciaddr2; |
| 616 | IPCPDEBUG((LOG_INFO, "remote IP address %s\n", |
| 617 | inet_ntoa(ciaddr2))); |
| 618 | } |
| 619 | ); |
| 620 | |
| 621 | /* |
| 622 | * Accept the peer's value of maxslotindex provided that it |
| 623 | * is less than what we asked for. Turn off slot-ID compression |
| 624 | * if the peer wants. Send old-style compress-type option if |
| 625 | * the peer wants. |
| 626 | */ |
| 627 | NAKCIVJ(CI_COMPRESSTYPE, neg_vj, |
| 628 | if (cilen == CILEN_VJ) { |
| 629 | GETCHAR(cimaxslotindex, p); |
| 630 | GETCHAR(cicflag, p); |
| 631 | if (cishort == IPCP_VJ_COMP) { |
| 632 | try.old_vj = 0; |
| 633 | if (cimaxslotindex < go->maxslotindex) |
| 634 | try.maxslotindex = cimaxslotindex; |
| 635 | if (!cicflag) |
| 636 | try.cflag = 0; |
| 637 | } else { |
| 638 | try.neg_vj = 0; |
| 639 | } |
| 640 | } else { |
| 641 | if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { |
| 642 | try.old_vj = 1; |
| 643 | try.vj_protocol = cishort; |
| 644 | } else { |
| 645 | try.neg_vj = 0; |
| 646 | } |
| 647 | } |
| 648 | ); |
| 649 | |
| 650 | NAKCIDNS(CI_MS_DNS1, req_dns1, |
| 651 | try.dnsaddr[0] = cidnsaddr; |
| 652 | IPCPDEBUG((LOG_INFO, "primary DNS address %s\n", inet_ntoa(cidnsaddr))); |
| 653 | ); |
| 654 | |
| 655 | NAKCIDNS(CI_MS_DNS2, req_dns2, |
| 656 | try.dnsaddr[1] = cidnsaddr; |
| 657 | IPCPDEBUG((LOG_INFO, "secondary DNS address %s\n", inet_ntoa(cidnsaddr))); |
| 658 | ); |
| 659 | |
| 660 | /* |
| 661 | * There may be remaining CIs, if the peer is requesting negotiation |
| 662 | * on an option that we didn't include in our request packet. |
| 663 | * If they want to negotiate about IP addresses, we comply. |
| 664 | * If they want us to ask for compression, we refuse. |
| 665 | */ |
| 666 | while (len > CILEN_VOID) { |
| 667 | GETCHAR(citype, p); |
| 668 | GETCHAR(cilen, p); |
| 669 | if( (len -= cilen) < 0 ) |
| 670 | goto bad; |
| 671 | next = p + cilen - 2; |
| 672 | |
| 673 | switch (citype) { |
| 674 | case CI_COMPRESSTYPE: |
| 675 | if (go->neg_vj || no.neg_vj || |
| 676 | (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) |
| 677 | goto bad; |
| 678 | no.neg_vj = 1; |
| 679 | break; |
| 680 | case CI_ADDRS: |
| 681 | if ((go->neg_addr && go->old_addrs) || no.old_addrs |
| 682 | || cilen != CILEN_ADDRS) |
| 683 | goto bad; |
| 684 | try.neg_addr = 1; |
| 685 | try.old_addrs = 1; |
| 686 | GETLONG(l, p); |
| 687 | ciaddr1 = htonl(l); |
| 688 | if (ciaddr1 && go->accept_local) |
| 689 | try.ouraddr = ciaddr1; |
| 690 | GETLONG(l, p); |
| 691 | ciaddr2 = htonl(l); |
| 692 | if (ciaddr2 && go->accept_remote) |
| 693 | try.hisaddr = ciaddr2; |
| 694 | no.old_addrs = 1; |
| 695 | break; |
| 696 | case CI_ADDR: |
| 697 | if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) |
| 698 | goto bad; |
| 699 | try.old_addrs = 0; |
| 700 | GETLONG(l, p); |
| 701 | ciaddr1 = htonl(l); |
| 702 | if (ciaddr1 && go->accept_local) |
| 703 | try.ouraddr = ciaddr1; |
| 704 | if (try.ouraddr != 0) |
| 705 | try.neg_addr = 1; |
| 706 | no.neg_addr = 1; |
| 707 | break; |
| 708 | } |
| 709 | p = next; |
| 710 | } |
| 711 | |
| 712 | /* If there is still anything left, this packet is bad. */ |
| 713 | if (len != 0) |
| 714 | goto bad; |
| 715 | |
| 716 | /* |
| 717 | * OK, the Nak is good. Now we can update state. |
| 718 | */ |
| 719 | if (f->state != OPENED) |
| 720 | *go = try; |
| 721 | |
| 722 | return 1; |
| 723 | |
| 724 | bad: |
| 725 | IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!\n")); |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | |
| 730 | /* |
| 731 | * ipcp_rejci - Reject some of our CIs. |
| 732 | */ |
| 733 | static int ipcp_rejci(fsm *f, u_char *p, int len) |
| 734 | { |
| 735 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 736 | u_char cimaxslotindex, ciflag, cilen; |
| 737 | u_short cishort; |
| 738 | u32_t cilong; |
| 739 | ipcp_options try; /* options to request next time */ |
| 740 | |
| 741 | try = *go; |
| 742 | /* |
| 743 | * Any Rejected CIs must be in exactly the same order that we sent. |
| 744 | * Check packet length and CI length at each step. |
| 745 | * If we find any deviations, then this packet is bad. |
| 746 | */ |
| 747 | #define REJCIADDR(opt, neg, old, val1, val2) \ |
| 748 | if (go->neg && \ |
| 749 | len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \ |
| 750 | p[1] == cilen && \ |
| 751 | p[0] == opt) { \ |
| 752 | u32_t l; \ |
| 753 | len -= cilen; \ |
| 754 | INCPTR(2, p); \ |
| 755 | GETLONG(l, p); \ |
| 756 | cilong = htonl(l); \ |
| 757 | /* Check rejected value. */ \ |
| 758 | if (cilong != val1) \ |
| 759 | goto bad; \ |
| 760 | if (old) { \ |
| 761 | GETLONG(l, p); \ |
| 762 | cilong = htonl(l); \ |
| 763 | /* Check rejected value. */ \ |
| 764 | if (cilong != val2) \ |
| 765 | goto bad; \ |
| 766 | } \ |
| 767 | try.neg = 0; \ |
| 768 | } |
| 769 | |
| 770 | #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ |
| 771 | if (go->neg && \ |
| 772 | p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ |
| 773 | len >= p[1] && \ |
| 774 | p[0] == opt) { \ |
| 775 | len -= p[1]; \ |
| 776 | INCPTR(2, p); \ |
| 777 | GETSHORT(cishort, p); \ |
| 778 | /* Check rejected value. */ \ |
| 779 | if (cishort != val) \ |
| 780 | goto bad; \ |
| 781 | if (!old) { \ |
| 782 | GETCHAR(cimaxslotindex, p); \ |
| 783 | if (cimaxslotindex != maxslot) \ |
| 784 | goto bad; \ |
| 785 | GETCHAR(ciflag, p); \ |
| 786 | if (ciflag != cflag) \ |
| 787 | goto bad; \ |
| 788 | } \ |
| 789 | try.neg = 0; \ |
| 790 | } |
| 791 | |
| 792 | #define REJCIDNS(opt, neg, dnsaddr) \ |
| 793 | if (go->neg && \ |
| 794 | ((cilen = p[1]) == CILEN_ADDR) && \ |
| 795 | len >= cilen && \ |
| 796 | p[0] == opt) { \ |
| 797 | u32_t l; \ |
| 798 | len -= cilen; \ |
| 799 | INCPTR(2, p); \ |
| 800 | GETLONG(l, p); \ |
| 801 | cilong = htonl(l); \ |
| 802 | /* Check rejected value. */ \ |
| 803 | if (cilong != dnsaddr) \ |
| 804 | goto bad; \ |
| 805 | try.neg = 0; \ |
| 806 | } |
| 807 | |
| 808 | REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, |
| 809 | go->old_addrs, go->ouraddr, go->hisaddr); |
| 810 | |
| 811 | REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, |
| 812 | go->maxslotindex, go->cflag); |
| 813 | |
| 814 | REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]); |
| 815 | |
| 816 | REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]); |
| 817 | |
| 818 | /* |
| 819 | * If there are any remaining CIs, then this packet is bad. |
| 820 | */ |
| 821 | if (len != 0) |
| 822 | goto bad; |
| 823 | /* |
| 824 | * Now we can update state. |
| 825 | */ |
| 826 | if (f->state != OPENED) |
| 827 | *go = try; |
| 828 | return 1; |
| 829 | |
| 830 | bad: |
| 831 | IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!\n")); |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | |
| 836 | /* |
| 837 | * ipcp_reqci - Check the peer's requested CIs and send appropriate response. |
| 838 | * |
| 839 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
| 840 | * appropriately. If reject_if_disagree is non-zero, doesn't return |
| 841 | * CONFNAK; returns CONFREJ if it can't return CONFACK. |
| 842 | */ |
| 843 | static int ipcp_reqci( |
| 844 | fsm *f, |
| 845 | u_char *inp, /* Requested CIs */ |
| 846 | int *len, /* Length of requested CIs */ |
| 847 | int reject_if_disagree |
| 848 | ) |
| 849 | { |
| 850 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| 851 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| 852 | ipcp_options *ao = &ipcp_allowoptions[f->unit]; |
| 853 | #ifdef OLD_CI_ADDRS |
| 854 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 855 | #endif |
| 856 | u_char *cip, *next; /* Pointer to current and next CIs */ |
| 857 | u_short cilen, citype; /* Parsed len, type */ |
| 858 | u_short cishort; /* Parsed short value */ |
| 859 | u32_t tl, ciaddr1; /* Parsed address values */ |
| 860 | #ifdef OLD_CI_ADDRS |
| 861 | u32_t ciaddr2; /* Parsed address values */ |
| 862 | #endif |
| 863 | int rc = CONFACK; /* Final packet return code */ |
| 864 | int orc; /* Individual option return code */ |
| 865 | u_char *p; /* Pointer to next char to parse */ |
| 866 | u_char *ucp = inp; /* Pointer to current output char */ |
| 867 | int l = *len; /* Length left */ |
| 868 | u_char maxslotindex, cflag; |
| 869 | int d; |
| 870 | |
| 871 | cis_received[f->unit] = 1; |
| 872 | |
| 873 | /* |
| 874 | * Reset all his options. |
| 875 | */ |
| 876 | BZERO(ho, sizeof(*ho)); |
| 877 | |
| 878 | /* |
| 879 | * Process all his options. |
| 880 | */ |
| 881 | next = inp; |
| 882 | while (l) { |
| 883 | orc = CONFACK; /* Assume success */ |
| 884 | cip = p = next; /* Remember begining of CI */ |
| 885 | if (l < 2 || /* Not enough data for CI header or */ |
| 886 | p[1] < 2 || /* CI length too small or */ |
| 887 | p[1] > l) { /* CI length too big? */ |
| 888 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!\n")); |
| 889 | orc = CONFREJ; /* Reject bad CI */ |
| 890 | cilen = l; /* Reject till end of packet */ |
| 891 | l = 0; /* Don't loop again */ |
| 892 | goto endswitch; |
| 893 | } |
| 894 | GETCHAR(citype, p); /* Parse CI type */ |
| 895 | GETCHAR(cilen, p); /* Parse CI length */ |
| 896 | l -= cilen; /* Adjust remaining length */ |
| 897 | next += cilen; /* Step to next CI */ |
| 898 | |
| 899 | switch (citype) { /* Check CI type */ |
| 900 | #ifdef OLD_CI_ADDRS /* Need to save space... */ |
| 901 | case CI_ADDRS: |
| 902 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: received ADDRS\n")); |
| 903 | if (!ao->neg_addr || |
| 904 | cilen != CILEN_ADDRS) { /* Check CI length */ |
| 905 | orc = CONFREJ; /* Reject CI */ |
| 906 | break; |
| 907 | } |
| 908 | |
| 909 | /* |
| 910 | * If he has no address, or if we both have his address but |
| 911 | * disagree about it, then NAK it with our idea. |
| 912 | * In particular, if we don't know his address, but he does, |
| 913 | * then accept it. |
| 914 | */ |
| 915 | GETLONG(tl, p); /* Parse source address (his) */ |
| 916 | ciaddr1 = htonl(tl); |
| 917 | IPCPDEBUG((LOG_INFO, "his addr %s\n", inet_ntoa(ciaddr1))); |
| 918 | if (ciaddr1 != wo->hisaddr |
| 919 | && (ciaddr1 == 0 || !wo->accept_remote)) { |
| 920 | orc = CONFNAK; |
| 921 | if (!reject_if_disagree) { |
| 922 | DECPTR(sizeof(u32_t), p); |
| 923 | tl = ntohl(wo->hisaddr); |
| 924 | PUTLONG(tl, p); |
| 925 | } |
| 926 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
| 927 | /* |
| 928 | * If neither we nor he knows his address, reject the option. |
| 929 | */ |
| 930 | orc = CONFREJ; |
| 931 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
| 932 | break; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * If he doesn't know our address, or if we both have our address |
| 937 | * but disagree about it, then NAK it with our idea. |
| 938 | */ |
| 939 | GETLONG(tl, p); /* Parse desination address (ours) */ |
| 940 | ciaddr2 = htonl(tl); |
| 941 | IPCPDEBUG((LOG_INFO, "our addr %s\n", inet_ntoa(ciaddr2))); |
| 942 | if (ciaddr2 != wo->ouraddr) { |
| 943 | if (ciaddr2 == 0 || !wo->accept_local) { |
| 944 | orc = CONFNAK; |
| 945 | if (!reject_if_disagree) { |
| 946 | DECPTR(sizeof(u32_t), p); |
| 947 | tl = ntohl(wo->ouraddr); |
| 948 | PUTLONG(tl, p); |
| 949 | } |
| 950 | } else { |
| 951 | go->ouraddr = ciaddr2; /* accept peer's idea */ |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | ho->neg_addr = 1; |
| 956 | ho->old_addrs = 1; |
| 957 | ho->hisaddr = ciaddr1; |
| 958 | ho->ouraddr = ciaddr2; |
| 959 | break; |
| 960 | #endif |
| 961 | |
| 962 | case CI_ADDR: |
| 963 | if (!ao->neg_addr) { |
| 964 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR not allowed\n")); |
| 965 | orc = CONFREJ; /* Reject CI */ |
| 966 | break; |
| 967 | } else if (cilen != CILEN_ADDR) { /* Check CI length */ |
| 968 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR bad len\n")); |
| 969 | orc = CONFREJ; /* Reject CI */ |
| 970 | break; |
| 971 | } |
| 972 | |
| 973 | /* |
| 974 | * If he has no address, or if we both have his address but |
| 975 | * disagree about it, then NAK it with our idea. |
| 976 | * In particular, if we don't know his address, but he does, |
| 977 | * then accept it. |
| 978 | */ |
| 979 | GETLONG(tl, p); /* Parse source address (his) */ |
| 980 | ciaddr1 = htonl(tl); |
| 981 | if (ciaddr1 != wo->hisaddr |
| 982 | && (ciaddr1 == 0 || !wo->accept_remote)) { |
| 983 | orc = CONFNAK; |
| 984 | if (!reject_if_disagree) { |
| 985 | DECPTR(sizeof(u32_t), p); |
| 986 | tl = ntohl(wo->hisaddr); |
| 987 | PUTLONG(tl, p); |
| 988 | } |
| 989 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1))); |
| 990 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
| 991 | /* |
| 992 | * Don't ACK an address of 0.0.0.0 - reject it instead. |
| 993 | */ |
| 994 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1))); |
| 995 | orc = CONFREJ; |
| 996 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
| 997 | break; |
| 998 | } |
| 999 | |
| 1000 | ho->neg_addr = 1; |
| 1001 | ho->hisaddr = ciaddr1; |
| 1002 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1))); |
| 1003 | break; |
| 1004 | |
| 1005 | case CI_MS_DNS1: |
| 1006 | case CI_MS_DNS2: |
| 1007 | /* Microsoft primary or secondary DNS request */ |
| 1008 | d = citype == CI_MS_DNS2; |
| 1009 | |
| 1010 | /* If we do not have a DNS address then we cannot send it */ |
| 1011 | if (ao->dnsaddr[d] == 0 || |
| 1012 | cilen != CILEN_ADDR) { /* Check CI length */ |
| 1013 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting DNS%d Request\n", d+1)); |
| 1014 | orc = CONFREJ; /* Reject CI */ |
| 1015 | break; |
| 1016 | } |
| 1017 | GETLONG(tl, p); |
| 1018 | if (htonl(tl) != ao->dnsaddr[d]) { |
| 1019 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking DNS%d Request %d\n", |
| 1020 | d+1, inet_ntoa(tl))); |
| 1021 | DECPTR(sizeof(u32_t), p); |
| 1022 | tl = ntohl(ao->dnsaddr[d]); |
| 1023 | PUTLONG(tl, p); |
| 1024 | orc = CONFNAK; |
| 1025 | } |
| 1026 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: received DNS%d Request\n", d+1)); |
| 1027 | break; |
| 1028 | |
| 1029 | case CI_MS_WINS1: |
| 1030 | case CI_MS_WINS2: |
| 1031 | /* Microsoft primary or secondary WINS request */ |
| 1032 | d = citype == CI_MS_WINS2; |
| 1033 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: received WINS%d Request\n", d+1)); |
| 1034 | |
| 1035 | /* If we do not have a DNS address then we cannot send it */ |
| 1036 | if (ao->winsaddr[d] == 0 || |
| 1037 | cilen != CILEN_ADDR) { /* Check CI length */ |
| 1038 | orc = CONFREJ; /* Reject CI */ |
| 1039 | break; |
| 1040 | } |
| 1041 | GETLONG(tl, p); |
| 1042 | if (htonl(tl) != ao->winsaddr[d]) { |
| 1043 | DECPTR(sizeof(u32_t), p); |
| 1044 | tl = ntohl(ao->winsaddr[d]); |
| 1045 | PUTLONG(tl, p); |
| 1046 | orc = CONFNAK; |
| 1047 | } |
| 1048 | break; |
| 1049 | |
| 1050 | case CI_COMPRESSTYPE: |
| 1051 | if (!ao->neg_vj) { |
| 1052 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n")); |
| 1053 | orc = CONFREJ; |
| 1054 | break; |
| 1055 | } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) { |
| 1056 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen)); |
| 1057 | orc = CONFREJ; |
| 1058 | break; |
| 1059 | } |
| 1060 | GETSHORT(cishort, p); |
| 1061 | |
| 1062 | if (!(cishort == IPCP_VJ_COMP || |
| 1063 | (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { |
| 1064 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort)); |
| 1065 | orc = CONFREJ; |
| 1066 | break; |
| 1067 | } |
| 1068 | |
| 1069 | ho->neg_vj = 1; |
| 1070 | ho->vj_protocol = cishort; |
| 1071 | if (cilen == CILEN_VJ) { |
| 1072 | GETCHAR(maxslotindex, p); |
| 1073 | if (maxslotindex > ao->maxslotindex) { |
| 1074 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ max slot %d\n", maxslotindex)); |
| 1075 | orc = CONFNAK; |
| 1076 | if (!reject_if_disagree){ |
| 1077 | DECPTR(1, p); |
| 1078 | PUTCHAR(ao->maxslotindex, p); |
| 1079 | } |
| 1080 | } |
| 1081 | GETCHAR(cflag, p); |
| 1082 | if (cflag && !ao->cflag) { |
| 1083 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ cflag %d\n", cflag)); |
| 1084 | orc = CONFNAK; |
| 1085 | if (!reject_if_disagree){ |
| 1086 | DECPTR(1, p); |
| 1087 | PUTCHAR(wo->cflag, p); |
| 1088 | } |
| 1089 | } |
| 1090 | ho->maxslotindex = maxslotindex; |
| 1091 | ho->cflag = cflag; |
| 1092 | } else { |
| 1093 | ho->old_vj = 1; |
| 1094 | ho->maxslotindex = MAX_SLOTS - 1; |
| 1095 | ho->cflag = 1; |
| 1096 | } |
| 1097 | IPCPDEBUG((LOG_INFO, |
| 1098 | "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n", |
| 1099 | ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag)); |
| 1100 | break; |
| 1101 | |
| 1102 | default: |
| 1103 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting unknown CI type %d\n", citype)); |
| 1104 | orc = CONFREJ; |
| 1105 | break; |
| 1106 | } |
| 1107 | |
| 1108 | endswitch: |
| 1109 | if (orc == CONFACK && /* Good CI */ |
| 1110 | rc != CONFACK) /* but prior CI wasnt? */ |
| 1111 | continue; /* Don't send this one */ |
| 1112 | |
| 1113 | if (orc == CONFNAK) { /* Nak this CI? */ |
| 1114 | if (reject_if_disagree) { /* Getting fed up with sending NAKs? */ |
| 1115 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting too many naks\n")); |
| 1116 | orc = CONFREJ; /* Get tough if so */ |
| 1117 | } else { |
| 1118 | if (rc == CONFREJ) /* Rejecting prior CI? */ |
| 1119 | continue; /* Don't send this one */ |
| 1120 | if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
| 1121 | rc = CONFNAK; /* Not anymore... */ |
| 1122 | ucp = inp; /* Backup */ |
| 1123 | } |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | if (orc == CONFREJ && /* Reject this CI */ |
| 1128 | rc != CONFREJ) { /* but no prior ones? */ |
| 1129 | rc = CONFREJ; |
| 1130 | ucp = inp; /* Backup */ |
| 1131 | } |
| 1132 | |
| 1133 | /* Need to move CI? */ |
| 1134 | if (ucp != cip) |
| 1135 | BCOPY(cip, ucp, cilen); /* Move it */ |
| 1136 | |
| 1137 | /* Update output pointer */ |
| 1138 | INCPTR(cilen, ucp); |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * If we aren't rejecting this packet, and we want to negotiate |
| 1143 | * their address, and they didn't send their address, then we |
| 1144 | * send a NAK with a CI_ADDR option appended. We assume the |
| 1145 | * input buffer is long enough that we can append the extra |
| 1146 | * option safely. |
| 1147 | */ |
| 1148 | if (rc != CONFREJ && !ho->neg_addr && |
| 1149 | wo->req_addr && !reject_if_disagree) { |
| 1150 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: Requesting peer address\n")); |
| 1151 | if (rc == CONFACK) { |
| 1152 | rc = CONFNAK; |
| 1153 | ucp = inp; /* reset pointer */ |
| 1154 | wo->req_addr = 0; /* don't ask again */ |
| 1155 | } |
| 1156 | PUTCHAR(CI_ADDR, ucp); |
| 1157 | PUTCHAR(CILEN_ADDR, ucp); |
| 1158 | tl = ntohl(wo->hisaddr); |
| 1159 | PUTLONG(tl, ucp); |
| 1160 | } |
| 1161 | |
| 1162 | *len = (int)(ucp - inp); /* Compute output length */ |
| 1163 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: returning Configure-%s\n", CODENAME(rc))); |
| 1164 | return (rc); /* Return final code */ |
| 1165 | } |
| 1166 | |
| 1167 | |
| 1168 | #if 0 |
| 1169 | /* |
| 1170 | * ip_check_options - check that any IP-related options are OK, |
| 1171 | * and assign appropriate defaults. |
| 1172 | */ |
| 1173 | static void ip_check_options(u_long localAddr) |
| 1174 | { |
| 1175 | ipcp_options *wo = &ipcp_wantoptions[0]; |
| 1176 | |
| 1177 | /* |
| 1178 | * Load our default IP address but allow the remote host to give us |
| 1179 | * a new address. |
| 1180 | */ |
| 1181 | if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) { |
| 1182 | wo->accept_local = 1; /* don't insist on this default value */ |
| 1183 | wo->ouraddr = htonl(localAddr); |
| 1184 | } |
| 1185 | } |
| 1186 | #endif |
| 1187 | |
| 1188 | |
| 1189 | /* |
| 1190 | * ipcp_up - IPCP has come UP. |
| 1191 | * |
| 1192 | * Configure the IP network interface appropriately and bring it up. |
| 1193 | */ |
| 1194 | static void ipcp_up(fsm *f) |
| 1195 | { |
| 1196 | u32_t mask; |
| 1197 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| 1198 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| 1199 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| 1200 | |
| 1201 | np_up(f->unit, PPP_IP); |
| 1202 | IPCPDEBUG((LOG_INFO, "ipcp: up\n")); |
| 1203 | |
| 1204 | /* |
| 1205 | * We must have a non-zero IP address for both ends of the link. |
| 1206 | */ |
| 1207 | if (!ho->neg_addr) |
| 1208 | ho->hisaddr = wo->hisaddr; |
| 1209 | |
| 1210 | if (ho->hisaddr == 0) { |
| 1211 | IPCPDEBUG((LOG_ERR, "Could not determine remote IP address\n")); |
| 1212 | ipcp_close(f->unit, "Could not determine remote IP address"); |
| 1213 | return; |
| 1214 | } |
| 1215 | if (go->ouraddr == 0) { |
| 1216 | IPCPDEBUG((LOG_ERR, "Could not determine local IP address\n")); |
| 1217 | ipcp_close(f->unit, "Could not determine local IP address"); |
| 1218 | return; |
| 1219 | } |
| 1220 | |
| 1221 | if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) { |
| 1222 | /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/ |
| 1223 | } |
| 1224 | |
| 1225 | /* |
| 1226 | * Check that the peer is allowed to use the IP address it wants. |
| 1227 | */ |
| 1228 | if (!auth_ip_addr(f->unit, ho->hisaddr)) { |
| 1229 | IPCPDEBUG((LOG_ERR, "Peer is not authorized to use remote address %s\n", |
| 1230 | inet_ntoa(ho->hisaddr))); |
| 1231 | ipcp_close(f->unit, "Unauthorized remote IP address"); |
| 1232 | return; |
| 1233 | } |
| 1234 | |
| 1235 | /* set tcp compression */ |
| 1236 | sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); |
| 1237 | |
| 1238 | /* |
| 1239 | * Set IP addresses and (if specified) netmask. |
| 1240 | */ |
| 1241 | mask = GetMask(go->ouraddr); |
| 1242 | |
| 1243 | if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) { |
| 1244 | IPCPDEBUG((LOG_WARNING, "sifaddr failed\n")); |
| 1245 | ipcp_close(f->unit, "Interface configuration failed"); |
| 1246 | return; |
| 1247 | } |
| 1248 | |
| 1249 | /* bring the interface up for IP */ |
| 1250 | if (!sifup(f->unit)) { |
| 1251 | IPCPDEBUG((LOG_WARNING, "sifup failed\n")); |
| 1252 | ipcp_close(f->unit, "Interface configuration failed"); |
| 1253 | return; |
| 1254 | } |
| 1255 | |
| 1256 | sifnpmode(f->unit, PPP_IP, NPMODE_PASS); |
| 1257 | |
| 1258 | /* assign a default route through the interface if required */ |
| 1259 | if (ipcp_wantoptions[f->unit].default_route) |
| 1260 | if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) |
| 1261 | default_route_set[f->unit] = 1; |
| 1262 | |
| 1263 | IPCPDEBUG((LOG_NOTICE, "local IP address %s\n", inet_ntoa(go->ouraddr))); |
| 1264 | IPCPDEBUG((LOG_NOTICE, "remote IP address %s\n", inet_ntoa(ho->hisaddr))); |
| 1265 | if (go->dnsaddr[0]) { |
| 1266 | IPCPDEBUG((LOG_NOTICE, "primary DNS address %s\n", inet_ntoa(go->dnsaddr[0]))); |
| 1267 | } |
| 1268 | if (go->dnsaddr[1]) { |
| 1269 | IPCPDEBUG((LOG_NOTICE, "secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1]))); |
| 1270 | } |
| 1271 | } |
| 1272 | |
| 1273 | |
| 1274 | /* |
| 1275 | * ipcp_down - IPCP has gone DOWN. |
| 1276 | * |
| 1277 | * Take the IP network interface down, clear its addresses |
| 1278 | * and delete routes through it. |
| 1279 | */ |
| 1280 | static void ipcp_down(fsm *f) |
| 1281 | { |
| 1282 | IPCPDEBUG((LOG_INFO, "ipcp: down\n")); |
| 1283 | np_down(f->unit, PPP_IP); |
| 1284 | sifvjcomp(f->unit, 0, 0, 0); |
| 1285 | |
| 1286 | sifdown(f->unit); |
| 1287 | ipcp_clear_addrs(f->unit); |
| 1288 | } |
| 1289 | |
| 1290 | |
| 1291 | /* |
| 1292 | * ipcp_clear_addrs() - clear the interface addresses, routes, etc. |
| 1293 | */ |
| 1294 | static void ipcp_clear_addrs(int unit) |
| 1295 | { |
| 1296 | u32_t ouraddr, hisaddr; |
| 1297 | |
| 1298 | ouraddr = ipcp_gotoptions[unit].ouraddr; |
| 1299 | hisaddr = ipcp_hisoptions[unit].hisaddr; |
| 1300 | if (default_route_set[unit]) { |
| 1301 | cifdefaultroute(unit, ouraddr, hisaddr); |
| 1302 | default_route_set[unit] = 0; |
| 1303 | } |
| 1304 | cifaddr(unit, ouraddr, hisaddr); |
| 1305 | } |
| 1306 | |
| 1307 | |
| 1308 | /* |
| 1309 | * ipcp_finished - possibly shut down the lower layers. |
| 1310 | */ |
| 1311 | static void ipcp_finished(fsm *f) |
| 1312 | { |
| 1313 | np_finished(f->unit, PPP_IP); |
| 1314 | } |
| 1315 | |
| 1316 | #if 0 |
| 1317 | static int ipcp_printpkt( |
| 1318 | u_char *p, |
| 1319 | int plen, |
| 1320 | void (*printer) (void *, char *, ...), |
| 1321 | void *arg |
| 1322 | ) |
| 1323 | { |
| 1324 | (void)p; |
| 1325 | (void)plen; |
| 1326 | (void)printer; |
| 1327 | (void)arg; |
| 1328 | return 0; |
| 1329 | } |
| 1330 | |
| 1331 | /* |
| 1332 | * ip_active_pkt - see if this IP packet is worth bringing the link up for. |
| 1333 | * We don't bring the link up for IP fragments or for TCP FIN packets |
| 1334 | * with no data. |
| 1335 | */ |
| 1336 | #define IP_HDRLEN 20 /* bytes */ |
| 1337 | #define IP_OFFMASK 0x1fff |
| 1338 | #define IPPROTO_TCP 6 |
| 1339 | #define TCP_HDRLEN 20 |
| 1340 | #define TH_FIN 0x01 |
| 1341 | |
| 1342 | /* |
| 1343 | * We use these macros because the IP header may be at an odd address, |
| 1344 | * and some compilers might use word loads to get th_off or ip_hl. |
| 1345 | */ |
| 1346 | |
| 1347 | #define net_short(x) (((x)[0] << 8) + (x)[1]) |
| 1348 | #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) |
| 1349 | #define get_ipoff(x) net_short((unsigned char *)(x) + 6) |
| 1350 | #define get_ipproto(x) (((unsigned char *)(x))[9]) |
| 1351 | #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) |
| 1352 | #define get_tcpflags(x) (((unsigned char *)(x))[13]) |
| 1353 | |
| 1354 | static int ip_active_pkt(u_char *pkt, int len) |
| 1355 | { |
| 1356 | u_char *tcp; |
| 1357 | int hlen; |
| 1358 | |
| 1359 | len -= PPP_HDRLEN; |
| 1360 | pkt += PPP_HDRLEN; |
| 1361 | if (len < IP_HDRLEN) |
| 1362 | return 0; |
| 1363 | if ((get_ipoff(pkt) & IP_OFFMASK) != 0) |
| 1364 | return 0; |
| 1365 | if (get_ipproto(pkt) != IPPROTO_TCP) |
| 1366 | return 1; |
| 1367 | hlen = get_iphl(pkt) * 4; |
| 1368 | if (len < hlen + TCP_HDRLEN) |
| 1369 | return 0; |
| 1370 | tcp = pkt + hlen; |
| 1371 | if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) |
| 1372 | return 0; |
| 1373 | return 1; |
| 1374 | } |
| 1375 | #endif |
| 1376 | |
| 1377 | #endif /* PPP_SUPPORT */ |