| 1 | /* |
| 2 | * Copyright (c) University of British Columbia, 1984 |
| 3 | * Copyright (c) 1990 The Regents of the University of California. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * the Laboratory for Computation Vision and the Computer Science Department |
| 8 | * of the University of British Columbia. |
| 9 | * |
| 10 | * %sccs.include.redist.c% |
| 11 | * |
| 12 | * @(#)pk_input.c 7.6 (Berkeley) %G% |
| 13 | */ |
| 14 | |
| 15 | #include "param.h" |
| 16 | #include "systm.h" |
| 17 | #include "mbuf.h" |
| 18 | #include "socket.h" |
| 19 | #include "protosw.h" |
| 20 | #include "socketvar.h" |
| 21 | #include "errno.h" |
| 22 | |
| 23 | #include "../net/if.h" |
| 24 | |
| 25 | #include "x25.h" |
| 26 | #include "pk.h" |
| 27 | #include "pk_var.h" |
| 28 | |
| 29 | /* |
| 30 | * This procedure is called by the link level whenever the link |
| 31 | * becomes operational, is reset, or when the link goes down. |
| 32 | */ |
| 33 | |
| 34 | pk_ctlinput (code, xcp) |
| 35 | register struct x25config *xcp; |
| 36 | { |
| 37 | |
| 38 | register struct pkcb *pkp; |
| 39 | |
| 40 | for (pkp = pkcbhead; pkp; pkp = pkp -> pk_next) |
| 41 | if (pkp -> pk_xcp == xcp) |
| 42 | break; |
| 43 | |
| 44 | if (pkp == 0) |
| 45 | return (EINVAL); |
| 46 | |
| 47 | switch (code) { |
| 48 | case PRC_LINKUP: |
| 49 | if (pkp -> pk_state == DTE_WAITING) |
| 50 | pk_restart (pkp, X25_RESTART_NETWORK_CONGESTION); |
| 51 | break; |
| 52 | |
| 53 | case PRC_LINKDOWN: |
| 54 | pk_restart (pkp, -1); /* Clear all active circuits */ |
| 55 | pkp -> pk_state = DTE_WAITING; |
| 56 | break; |
| 57 | |
| 58 | case PRC_LINKRESET: |
| 59 | pk_restart (pkp, X25_RESTART_NETWORK_CONGESTION); |
| 60 | break; |
| 61 | |
| 62 | } |
| 63 | return (0); |
| 64 | } |
| 65 | struct ifqueue pkintrq; |
| 66 | /* |
| 67 | * This routine is called if there are semi-smart devices that do HDLC |
| 68 | * in hardware and want to queue the packet and call level 3 directly |
| 69 | */ |
| 70 | pkintr () |
| 71 | { |
| 72 | register struct mbuf *m; |
| 73 | register struct ifaddr *ifa; |
| 74 | register struct ifnet *ifp; |
| 75 | register int s; |
| 76 | |
| 77 | for (;;) { |
| 78 | s = splimp (); |
| 79 | IF_DEQUEUE (&pkintrq, m); |
| 80 | splx (s); |
| 81 | if (m == 0) |
| 82 | break; |
| 83 | if (m->m_len < PKHEADERLN) { |
| 84 | printf ("pkintr: packet too short (len=%d)\n", |
| 85 | m->m_len); |
| 86 | m_freem (m); |
| 87 | continue; |
| 88 | } |
| 89 | if ((m->m_flags & M_PKTHDR) == 0) |
| 90 | panic("pkintr"); |
| 91 | ifp = m->m_pkthdr.rcvif; |
| 92 | /* |
| 93 | * look up the appropriate control block |
| 94 | */ |
| 95 | for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) |
| 96 | if (ifa->ifa_addr->sa_family == AF_CCITT) |
| 97 | break; |
| 98 | if (ifa == 0) |
| 99 | continue; |
| 100 | pk_input(m, ((struct x25_ifaddr *)ifa)->ia_xcp); |
| 101 | } |
| 102 | } |
| 103 | struct mbuf *pk_bad_packet; |
| 104 | /* |
| 105 | * X.25 PACKET INPUT |
| 106 | * |
| 107 | * This procedure is called by a link level procedure whenever |
| 108 | * an information frame is received. It decodes the packet and |
| 109 | * demultiplexes based on the logical channel number. |
| 110 | * |
| 111 | */ |
| 112 | |
| 113 | pk_input (m, xcp) |
| 114 | register struct mbuf *m; |
| 115 | struct x25config *xcp; |
| 116 | { |
| 117 | register struct x25_packet *xp; |
| 118 | register struct pklcd *lcp; |
| 119 | register struct socket *so = 0; |
| 120 | register struct pkcb *pkp; |
| 121 | int ptype, lcn, lcdstate = LISTEN; |
| 122 | static struct x25config *lastxcp; |
| 123 | static struct pkcb *lastpkp; |
| 124 | |
| 125 | if (xcp == lastxcp) |
| 126 | pkp = lastpkp; |
| 127 | else { |
| 128 | for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { |
| 129 | if (pkp == 0) { |
| 130 | pk_message (0, xcp, "pk_input: unknown network"); |
| 131 | m_freem (m); |
| 132 | return; |
| 133 | } |
| 134 | if (pkp -> pk_xcp == xcp) |
| 135 | break; |
| 136 | } |
| 137 | lastxcp = xcp; |
| 138 | lastpkp = pkp; |
| 139 | } |
| 140 | |
| 141 | xp = mtod (m, struct x25_packet *); |
| 142 | ptype = pk_decode (xp); |
| 143 | lcn = xp -> logical_channel_number; |
| 144 | lcp = pkp -> pk_chan[lcn]; |
| 145 | |
| 146 | /* |
| 147 | * If the DTE is in Restart state, then it will ignore data, |
| 148 | * interrupt, call setup and clearing, flow control and reset |
| 149 | * packets. |
| 150 | */ |
| 151 | if (lcn < 0 || lcn > pkp -> pk_maxlcn) { |
| 152 | pk_message (lcn, pkp -> pk_xcp, "illegal lcn"); |
| 153 | m_freem (m); |
| 154 | return; |
| 155 | } |
| 156 | |
| 157 | pk_trace (pkp -> pk_xcp, xp, "P-In"); |
| 158 | |
| 159 | if (pkp -> pk_state != DTE_READY && ptype != RESTART && ptype != RESTART_CONF) { |
| 160 | m_freem (m); |
| 161 | return; |
| 162 | } |
| 163 | if (lcp) { |
| 164 | so = lcp -> lcd_so; |
| 165 | lcdstate = lcp -> lcd_state; |
| 166 | } else { |
| 167 | if (ptype == CLEAR) { /* idle line probe (Datapac specific) */ |
| 168 | /* send response on lcd 0's output queue */ |
| 169 | lcp -> lcd_template = pk_template (lcn, X25_CLEAR_CONFIRM); |
| 170 | pk_output (lcp); |
| 171 | m_freem (m); |
| 172 | return; |
| 173 | } |
| 174 | if (ptype != CALL) |
| 175 | ptype = INVALID_PACKET; |
| 176 | } |
| 177 | |
| 178 | if (lcn == 0 && ptype != RESTART && ptype != RESTART_CONF) { |
| 179 | pk_message (0, pkp -> pk_xcp, "illegal ptype (%d, %s) on lcn 0", |
| 180 | ptype, pk_name[ptype / MAXSTATES]); |
| 181 | if (pk_bad_packet) |
| 182 | m_freem (pk_bad_packet); |
| 183 | pk_bad_packet = m; |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | switch (ptype + lcdstate) { |
| 188 | /* |
| 189 | * Incoming Call packet received. |
| 190 | */ |
| 191 | case CALL + LISTEN: |
| 192 | incoming_call (pkp, xp, m -> m_len); |
| 193 | break; |
| 194 | |
| 195 | /* |
| 196 | * Call collision: Just throw this "incoming call" away since |
| 197 | * the DCE will ignore it anyway. |
| 198 | */ |
| 199 | case CALL + SENT_CALL: |
| 200 | pk_message ((int)xp -> logical_channel_number, pkp -> pk_xcp, |
| 201 | "incoming call collision"); |
| 202 | break; |
| 203 | |
| 204 | /* |
| 205 | * Call confirmation packet received. This usually means our |
| 206 | * previous connect request is now complete. |
| 207 | */ |
| 208 | case CALL_ACCEPTED + SENT_CALL: |
| 209 | call_accepted (lcp, xp, m -> m_len); |
| 210 | break; |
| 211 | |
| 212 | /* |
| 213 | * This condition can only happen if the previous state was |
| 214 | * SENT_CALL. Just ignore the packet, eventually a clear |
| 215 | * confirmation should arrive. |
| 216 | */ |
| 217 | case CALL_ACCEPTED + SENT_CLEAR: |
| 218 | break; |
| 219 | |
| 220 | /* |
| 221 | * Clear packet received. This requires a complete tear down |
| 222 | * of the virtual circuit. Free buffers and control blocks. |
| 223 | * and send a clear confirmation. |
| 224 | */ |
| 225 | case CLEAR + READY: |
| 226 | case CLEAR + RECEIVED_CALL: |
| 227 | case CLEAR + SENT_CALL: |
| 228 | case CLEAR + DATA_TRANSFER: |
| 229 | lcp -> lcd_state = RECEIVED_CLEAR; |
| 230 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CLEAR_CONFIRM); |
| 231 | pk_output (lcp); |
| 232 | pk_clearcause (pkp, xp); |
| 233 | pk_close (lcp); |
| 234 | break; |
| 235 | |
| 236 | /* |
| 237 | * Clear collision: Treat this clear packet as a confirmation. |
| 238 | */ |
| 239 | case CLEAR + SENT_CLEAR: |
| 240 | pk_close (lcp); |
| 241 | break; |
| 242 | |
| 243 | /* |
| 244 | * Clear confirmation received. This usually means the virtual |
| 245 | * circuit is now completely removed. |
| 246 | */ |
| 247 | case CLEAR_CONF + SENT_CLEAR: |
| 248 | pk_close (lcp); |
| 249 | break; |
| 250 | |
| 251 | /* |
| 252 | * A clear confirmation on an unassigned logical channel - just |
| 253 | * ignore it. Note: All other packets on an unassigned channel |
| 254 | * results in a clear. |
| 255 | */ |
| 256 | case CLEAR_CONF + READY: |
| 257 | break; |
| 258 | |
| 259 | /* |
| 260 | * Data packet received. Pass on to next level. Move the Q and M |
| 261 | * bits into the data portion for the next level. |
| 262 | */ |
| 263 | case DATA + DATA_TRANSFER: |
| 264 | if (lcp -> lcd_reset_condition) { |
| 265 | ptype = DELETE_PACKET; |
| 266 | break; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Process the P(S) flow control information in this Data packet. |
| 271 | * Check that the packets arrive in the correct sequence and that |
| 272 | * they are within the "lcd_input_window". Input window rotation is |
| 273 | * initiated by the receive interface. |
| 274 | */ |
| 275 | |
| 276 | if (PS(xp) != ((lcp -> lcd_rsn + 1) % MODULUS) || |
| 277 | PS(xp) == ((lcp -> lcd_input_window + lcp->lcd_windowsize) % MODULUS)) { |
| 278 | m_freem (m); |
| 279 | pk_procerror (RESET, lcp, "p(s) flow control error"); |
| 280 | break; |
| 281 | } |
| 282 | lcp -> lcd_rsn = PS(xp); |
| 283 | |
| 284 | if (pk_ack (lcp, PR(xp)) != PACKET_OK) { |
| 285 | m_freem (m); |
| 286 | break; |
| 287 | } |
| 288 | if (so == 0) |
| 289 | break; |
| 290 | m -> m_data += PKHEADERLN; |
| 291 | m -> m_len -= PKHEADERLN; |
| 292 | if (lcp -> lcd_flags & X25_MQBIT) { |
| 293 | octet *t; |
| 294 | |
| 295 | m -> m_data -= 1; |
| 296 | m -> m_len += 1; |
| 297 | t = mtod (m, octet *); |
| 298 | *t = 0x00; |
| 299 | if (xp -> q_bit) |
| 300 | *t |= 0x80; |
| 301 | if (MBIT(xp)) |
| 302 | *t |= 0x40; |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * Discard Q-BIT packets if the application |
| 307 | * doesn't want to be informed of M and Q bit status |
| 308 | */ |
| 309 | if (xp -> q_bit && (lcp -> lcd_flags & X25_MQBIT) == 0) { |
| 310 | m_freem (m); |
| 311 | lcp -> lcd_rxcnt++; |
| 312 | /* |
| 313 | * NB. This is dangerous: sending a RR here can |
| 314 | * cause sequence number errors if a previous data |
| 315 | * packet has not yet been passed up to the application |
| 316 | * (RR's are normally generated via PRU_RCVD). |
| 317 | */ |
| 318 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RR); |
| 319 | pk_output (lcp); |
| 320 | } else { |
| 321 | #ifdef BSD4_3 |
| 322 | sbappendrecord (&so -> so_rcv, m); |
| 323 | #else |
| 324 | sbappend (&so -> so_rcv, m); |
| 325 | #endif |
| 326 | sorwakeup (so); |
| 327 | } |
| 328 | break; |
| 329 | |
| 330 | /* |
| 331 | * Interrupt packet received. |
| 332 | */ |
| 333 | case INTERRUPT + DATA_TRANSFER: |
| 334 | if (lcp -> lcd_reset_condition) |
| 335 | break; |
| 336 | lcp -> lcd_intrdata = xp -> packet_data; |
| 337 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_INTERRUPT_CONFIRM); |
| 338 | pk_output (lcp); |
| 339 | MCHTYPE(m, MT_OOBDATA); |
| 340 | if (so) |
| 341 | sohasoutofband (so); |
| 342 | break; |
| 343 | |
| 344 | /* |
| 345 | * Interrupt confirmation packet received. |
| 346 | */ |
| 347 | case INTERRUPT_CONF + DATA_TRANSFER: |
| 348 | if (lcp -> lcd_reset_condition) |
| 349 | break; |
| 350 | if (lcp -> lcd_intrconf_pending == TRUE) |
| 351 | lcp -> lcd_intrconf_pending = FALSE; |
| 352 | else |
| 353 | pk_procerror (RESET, lcp, "unexpected packet"); |
| 354 | MCHTYPE(m, MT_CONTROL); |
| 355 | break; |
| 356 | |
| 357 | /* |
| 358 | * Receiver ready received. Rotate the output window and output |
| 359 | * any data packets waiting transmission. |
| 360 | */ |
| 361 | case RR + DATA_TRANSFER: |
| 362 | if (lcp -> lcd_reset_condition || |
| 363 | pk_ack (lcp, PR(xp)) != PACKET_OK) { |
| 364 | ptype = DELETE_PACKET; |
| 365 | break; |
| 366 | } |
| 367 | if (lcp -> lcd_rnr_condition == TRUE) |
| 368 | lcp -> lcd_rnr_condition = FALSE; |
| 369 | pk_output (lcp); |
| 370 | MCHTYPE(m, MT_CONTROL); |
| 371 | break; |
| 372 | |
| 373 | /* |
| 374 | * Receiver Not Ready received. Packets up to the P(R) can be |
| 375 | * be sent. Condition is cleared with a RR. |
| 376 | */ |
| 377 | case RNR + DATA_TRANSFER: |
| 378 | if (lcp -> lcd_reset_condition || |
| 379 | pk_ack (lcp, PR(xp)) != PACKET_OK) { |
| 380 | ptype = DELETE_PACKET; |
| 381 | break; |
| 382 | } |
| 383 | lcp -> lcd_rnr_condition = TRUE; |
| 384 | MCHTYPE(m, MT_CONTROL); |
| 385 | break; |
| 386 | |
| 387 | /* |
| 388 | * Reset packet received. Set state to FLOW_OPEN. The Input and |
| 389 | * Output window edges ar set to zero. Both the send and receive |
| 390 | * numbers are reset. A confirmation is returned. |
| 391 | */ |
| 392 | case RESET + DATA_TRANSFER: |
| 393 | if (lcp -> lcd_reset_condition) |
| 394 | /* Reset collision. Just ignore packet. */ |
| 395 | break; |
| 396 | |
| 397 | pk_resetcause (pkp, xp); |
| 398 | lcp -> lcd_window_condition = lcp -> lcd_rnr_condition = |
| 399 | lcp -> lcd_intrconf_pending = FALSE; |
| 400 | lcp -> lcd_output_window = lcp -> lcd_input_window = |
| 401 | lcp -> lcd_last_transmitted_pr = 0; |
| 402 | lcp -> lcd_ssn = 0; |
| 403 | lcp -> lcd_rsn = MODULUS - 1; |
| 404 | |
| 405 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESET_CONFIRM); |
| 406 | pk_output (lcp); |
| 407 | |
| 408 | MCHTYPE(m, MT_CONTROL); |
| 409 | if (so == 0) |
| 410 | break; |
| 411 | sbflush (&so -> so_snd); |
| 412 | sbflush (&so -> so_rcv); |
| 413 | wakeup ((caddr_t) & so -> so_timeo); |
| 414 | sorwakeup (so); |
| 415 | sowwakeup (so); |
| 416 | break; |
| 417 | |
| 418 | /* |
| 419 | * Reset confirmation received. |
| 420 | */ |
| 421 | case RESET_CONF + DATA_TRANSFER: |
| 422 | if (lcp -> lcd_reset_condition) { |
| 423 | lcp -> lcd_reset_condition = FALSE; |
| 424 | pk_output (lcp); |
| 425 | } |
| 426 | else |
| 427 | pk_procerror (RESET, lcp, "unexpected packet"); |
| 428 | MCHTYPE(m, MT_CONTROL); |
| 429 | break; |
| 430 | |
| 431 | case DATA + SENT_CLEAR: |
| 432 | ptype = DELETE_PACKET; |
| 433 | case RR + SENT_CLEAR: |
| 434 | case RNR + SENT_CLEAR: |
| 435 | case INTERRUPT + SENT_CLEAR: |
| 436 | case INTERRUPT_CONF + SENT_CLEAR: |
| 437 | case RESET + SENT_CLEAR: |
| 438 | case RESET_CONF + SENT_CLEAR: |
| 439 | /* Just ignore p if we have sent a CLEAR already. |
| 440 | */ |
| 441 | break; |
| 442 | |
| 443 | /* |
| 444 | * Restart sets all the permanent virtual circuits to the "Data |
| 445 | * Transfer" stae and all the switched virtual circuits to the |
| 446 | * "Ready" state. |
| 447 | */ |
| 448 | case RESTART + READY: |
| 449 | switch (pkp -> pk_state) { |
| 450 | case DTE_SENT_RESTART: |
| 451 | /* Restart collision. */ |
| 452 | pkp -> pk_state = DTE_READY; |
| 453 | pk_message (0, pkp -> pk_xcp, |
| 454 | "Packet level operational"); |
| 455 | break; |
| 456 | |
| 457 | default: |
| 458 | pk_restart (pkp, -1); |
| 459 | pk_restartcause (pkp, xp); |
| 460 | pkp -> pk_chan[0] -> lcd_template = pk_template (0, |
| 461 | X25_RESTART_CONFIRM); |
| 462 | pk_output (pkp -> pk_chan[0]); |
| 463 | } |
| 464 | break; |
| 465 | |
| 466 | /* |
| 467 | * Restart confirmation received. All logical channels are set |
| 468 | * to READY. |
| 469 | */ |
| 470 | case RESTART_CONF + READY: |
| 471 | switch (pkp -> pk_state) { |
| 472 | case DTE_SENT_RESTART: |
| 473 | pkp -> pk_state = DTE_READY; |
| 474 | pk_message (0, pkp -> pk_xcp, |
| 475 | "Packet level operational"); |
| 476 | break; |
| 477 | |
| 478 | default: |
| 479 | /* Restart local procedure error. */ |
| 480 | pk_restart (pkp, X25_RESTART_LOCAL_PROCEDURE_ERROR); |
| 481 | pkp -> pk_state = DTE_SENT_RESTART; |
| 482 | } |
| 483 | break; |
| 484 | |
| 485 | default: |
| 486 | if (lcp) { |
| 487 | pk_procerror (CLEAR, lcp, "unknown packet error"); |
| 488 | pk_message (lcn, pkp -> pk_xcp, |
| 489 | "\"%s\" unexpected in \"%s\" state", |
| 490 | pk_name[ptype/MAXSTATES], pk_state[lcdstate]); |
| 491 | } |
| 492 | else /* Packets arrived on an unassigned channel. |
| 493 | */ |
| 494 | pk_message ((int)xp->logical_channel_number, pkp -> pk_xcp, |
| 495 | "packet arrived on unassigned lcn"); |
| 496 | break; |
| 497 | } |
| 498 | if (so == 0 && lcdstate == DATA_TRANSFER && lcp -> lcd_upper) |
| 499 | lcp -> lcd_upper (lcp, m); |
| 500 | else if (ptype != DATA) |
| 501 | m_freem (m); |
| 502 | } |
| 503 | |
| 504 | |
| 505 | /* |
| 506 | * This routine handles incoming call packets. It matches the protocol |
| 507 | * field on the Call User Data field (usually the first four bytes) with |
| 508 | * sockets awaiting connections. |
| 509 | */ |
| 510 | |
| 511 | static |
| 512 | incoming_call (pkp, xp, len) |
| 513 | struct pkcb *pkp; |
| 514 | struct x25_packet *xp; |
| 515 | { |
| 516 | register struct pklcd *lcp = 0, *l; |
| 517 | register struct sockaddr_x25 *sa; |
| 518 | register struct x25_calladdr *a; |
| 519 | register struct socket *so = 0; |
| 520 | struct mbuf *m; |
| 521 | register int l1, l2; |
| 522 | char *e, *errstr = "server unavailable"; |
| 523 | octet *u; |
| 524 | int lcn = xp -> logical_channel_number; |
| 525 | |
| 526 | /* First, copy the data from the incoming call packet to a X25_socket |
| 527 | descriptor. */ |
| 528 | |
| 529 | a = (struct x25_calladdr *) &xp -> packet_data; |
| 530 | l1 = a -> calling_addrlen; |
| 531 | l2 = a -> called_addrlen; |
| 532 | if ((m = m_getclr (M_DONTWAIT, MT_SONAME)) == 0) |
| 533 | return; |
| 534 | sa = mtod (m, struct sockaddr_x25 *); |
| 535 | u = (octet *) (a -> address_field + l2 / 2); |
| 536 | e = sa -> x25_addr; |
| 537 | if (l2 & 0x01) { |
| 538 | *e++ = *u++ & 0x0f; |
| 539 | l1--; |
| 540 | } |
| 541 | from_bcd (e, &u, l1); |
| 542 | if (l1 & 0x01) |
| 543 | u++; |
| 544 | |
| 545 | parse_facilities (u, sa); |
| 546 | u += *u + 1; |
| 547 | sa -> x25_udlen = min (16, ((octet *)xp) + len - u); |
| 548 | if (sa -> x25_udlen < 0) |
| 549 | sa -> x25_udlen = 0; |
| 550 | bcopy ((caddr_t)u, sa -> x25_udata, (unsigned)sa -> x25_udlen); |
| 551 | |
| 552 | /* |
| 553 | * Now, loop through the listen sockets looking for a match on the |
| 554 | * PID. That is the first four octets of the user data field. This |
| 555 | * is the closest thing to a port number for X.25 packets. What it |
| 556 | * does provide is away of multiplexing services at the user level. |
| 557 | */ |
| 558 | |
| 559 | for (l = pk_listenhead; l; l = l -> lcd_listen) { |
| 560 | struct sockaddr_x25 *sxp = l -> lcd_ceaddr; |
| 561 | |
| 562 | if (bcmp (sxp -> x25_udata, sa -> x25_udata, sxp->x25_udlen)) |
| 563 | continue; |
| 564 | if (sxp -> x25_net && |
| 565 | sxp -> x25_net != pkp->pk_xc.xc_addr.x25_net) |
| 566 | continue; |
| 567 | /* |
| 568 | * don't accept incoming collect calls unless |
| 569 | * the server sets the reverse charging option. |
| 570 | */ |
| 571 | if ((sxp -> x25_opts.op_flags & (X25_OLDSOCKADDR|X25_REVERSE_CHARGE)) == 0 && |
| 572 | sa -> x25_opts.op_flags & X25_REVERSE_CHARGE) { |
| 573 | errstr = "incoming collect call refused"; |
| 574 | break; |
| 575 | } |
| 576 | if (l -> lcd_so) { |
| 577 | if (so = sonewconn (l -> lcd_so, SS_ISCONNECTED)) |
| 578 | lcp = (struct pklcd *) so -> so_pcb; |
| 579 | } else |
| 580 | lcp = pk_attach((struct socket *) 0); |
| 581 | if (lcp == 0) { |
| 582 | /* |
| 583 | * Insufficient space or too many unaccepted |
| 584 | * connections. Just throw the call away. |
| 585 | */ |
| 586 | errstr = "server malfunction"; |
| 587 | break; |
| 588 | } |
| 589 | lcp -> lcd_upper = l -> lcd_upper; |
| 590 | lcp -> lcd_upnext = l -> lcd_upnext; |
| 591 | lcp -> lcd_lcn = lcn; |
| 592 | lcp -> lcd_state = RECEIVED_CALL; |
| 593 | lcp -> lcd_craddr = sa; |
| 594 | sa -> x25_opts.op_flags |= sxp -> x25_opts.op_flags & |
| 595 | ~X25_REVERSE_CHARGE; |
| 596 | pk_assoc (pkp, lcp, sa); |
| 597 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CALL_ACCEPTED); |
| 598 | if (so) { |
| 599 | pk_output (lcp); |
| 600 | soisconnected (so); |
| 601 | } else if (lcp->lcd_upper) |
| 602 | (*lcp->lcd_upper)(lcp, m); |
| 603 | return; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * If the call fails for whatever reason, we still need to build a |
| 608 | * skeleton LCD in order to be able to properly receive the CLEAR |
| 609 | * CONFIRMATION. |
| 610 | */ |
| 611 | #ifdef WATERLOO /* be explicit */ |
| 612 | if (l == 0 && bcmp(sa->x25_udata, "ean", 3) == 0) |
| 613 | pk_message (lcn, pkp -> pk_xcp, "host=%s ean%c: %s", |
| 614 | sa->x25_addr, sa->x25_udata[3] & 0xff, errstr); |
| 615 | else if (l == 0 && bcmp(sa->x25_udata, "\1\0\0\0", 4) == 0) |
| 616 | pk_message (lcn, pkp -> pk_xcp, "host=%s x29d: %s", |
| 617 | sa->x25_addr, errstr); |
| 618 | else |
| 619 | #endif |
| 620 | pk_message (lcn, pkp -> pk_xcp, "host=%s pid=%x %x %x %x: %s", |
| 621 | sa -> x25_addr, sa -> x25_udata[0] & 0xff, |
| 622 | sa -> x25_udata[1] & 0xff, sa -> x25_udata[2] & 0xff, |
| 623 | sa -> x25_udata[3] & 0xff, errstr); |
| 624 | if ((lcp = pk_attach((struct socket *)0)) == 0) { |
| 625 | (void) m_free (m); |
| 626 | return; |
| 627 | } |
| 628 | lcp -> lcd_lcn = lcn; |
| 629 | lcp -> lcd_state = RECEIVED_CALL; |
| 630 | pk_assoc (pkp, lcp, sa); |
| 631 | (void) m_free (m); |
| 632 | pk_clear (lcp); |
| 633 | } |
| 634 | |
| 635 | static |
| 636 | call_accepted (lcp, xp, len) |
| 637 | struct pklcd *lcp; |
| 638 | struct x25_packet *xp; |
| 639 | { |
| 640 | register struct x25_calladdr *ap; |
| 641 | register octet *fcp; |
| 642 | |
| 643 | lcp -> lcd_state = DATA_TRANSFER; |
| 644 | if (lcp -> lcd_so) |
| 645 | soisconnected (lcp -> lcd_so); |
| 646 | if (len > 3) { |
| 647 | ap = (struct x25_calladdr *) &xp -> packet_data; |
| 648 | fcp = (octet *) ap -> address_field + (ap -> calling_addrlen + |
| 649 | ap -> called_addrlen + 1) / 2; |
| 650 | if (fcp + *fcp <= ((octet *)xp) + len) |
| 651 | parse_facilities (fcp, lcp -> lcd_ceaddr); |
| 652 | } |
| 653 | pk_assoc (lcp -> lcd_pkp, lcp, lcp -> lcd_ceaddr); |
| 654 | } |
| 655 | |
| 656 | static |
| 657 | parse_facilities (fcp, sa) |
| 658 | register octet *fcp; |
| 659 | register struct sockaddr_x25 *sa; |
| 660 | { |
| 661 | register octet *maxfcp; |
| 662 | |
| 663 | maxfcp = fcp + *fcp; |
| 664 | fcp++; |
| 665 | while (fcp < maxfcp) { |
| 666 | /* |
| 667 | * Ignore national DCE or DTE facilities |
| 668 | */ |
| 669 | if (*fcp == 0 || *fcp == 0xff) |
| 670 | break; |
| 671 | switch (*fcp) { |
| 672 | case FACILITIES_WINDOWSIZE: |
| 673 | sa -> x25_opts.op_wsize = fcp[1]; |
| 674 | fcp += 3; |
| 675 | break; |
| 676 | |
| 677 | case FACILITIES_PACKETSIZE: |
| 678 | sa -> x25_opts.op_psize = fcp[1]; |
| 679 | fcp += 3; |
| 680 | break; |
| 681 | |
| 682 | case FACILITIES_THROUGHPUT: |
| 683 | sa -> x25_opts.op_speed = fcp[1]; |
| 684 | fcp += 2; |
| 685 | break; |
| 686 | |
| 687 | case FACILITIES_REVERSE_CHARGE: |
| 688 | if (fcp[1] & 01) |
| 689 | sa -> x25_opts.op_flags |= X25_REVERSE_CHARGE; |
| 690 | /* |
| 691 | * Datapac specific: for a X.25(1976) DTE, bit 2 |
| 692 | * indicates a "hi priority" (eg. international) call. |
| 693 | */ |
| 694 | if (fcp[1] & 02 && sa -> x25_opts.op_psize == 0) |
| 695 | sa -> x25_opts.op_psize = X25_PS128; |
| 696 | fcp += 2; |
| 697 | break; |
| 698 | |
| 699 | default: |
| 700 | /*printf("unknown facility %x, class=%d\n", *fcp, (*fcp & 0xc0) >> 6);*/ |
| 701 | switch ((*fcp & 0xc0) >> 6) { |
| 702 | case 0: /* class A */ |
| 703 | fcp += 2; |
| 704 | break; |
| 705 | |
| 706 | case 1: |
| 707 | fcp += 3; |
| 708 | break; |
| 709 | |
| 710 | case 2: |
| 711 | fcp += 4; |
| 712 | break; |
| 713 | |
| 714 | case 3: |
| 715 | fcp++; |
| 716 | fcp += *fcp; |
| 717 | } |
| 718 | } |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | from_bcd (a, x, len) |
| 723 | register char *a; |
| 724 | register octet **x; |
| 725 | register int len; |
| 726 | { |
| 727 | register int posn = 0; |
| 728 | |
| 729 | while (--len >= 0) { |
| 730 | if (posn++ & 0x01) |
| 731 | *a = *(*x)++ & 0x0f; |
| 732 | else |
| 733 | *a = (**x >> 4) & 0x0F; |
| 734 | *a++ |= 0x30; |
| 735 | } |
| 736 | } |