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_subr.c 7.13 (Berkeley) 05/09/91 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 #include "time.h" 23 #include "kernel.h" 24 25 #include "../net/if.h" 26 27 #include "x25.h" 28 #include "pk.h" 29 #include "pk_var.h" 30 #include "x25err.h" 31 32 int pk_sendspace = 1024 * 2 + 8; 33 int pk_recvspace = 1024 * 2 + 8; 34 35 struct pklcd_q pklcd_q = {&pklcd_q, &pklcd_q}; 36 37 /* 38 * Attach X.25 protocol to socket, allocate logical channel descripter 39 * and buffer space, and enter LISTEN state if we are to accept 40 * IN-COMMING CALL packets. 41 * 42 */ 43 44 struct pklcd * 45 pk_attach (so) 46 struct socket *so; 47 { 48 register struct pklcd *lcp; 49 register int error = ENOBUFS; 50 int pk_output(); 51 52 MALLOC(lcp, struct pklcd *, sizeof (*lcp), M_PCB, M_NOWAIT); 53 if (lcp) { 54 bzero ((caddr_t)lcp, sizeof (*lcp)); 55 insque (&lcp -> lcd_q, &pklcd_q); 56 lcp -> lcd_state = READY; 57 lcp -> lcd_send = pk_output; 58 if (so) { 59 error = soreserve (so, pk_sendspace, pk_recvspace); 60 lcp -> lcd_so = so; 61 if (so -> so_options & SO_ACCEPTCONN) 62 lcp -> lcd_state = LISTEN; 63 } else 64 sbreserve (&lcp -> lcd_sb, pk_sendspace); 65 } 66 if (so) { 67 so -> so_pcb = (caddr_t) lcp; 68 so -> so_error = error; 69 } 70 return (lcp); 71 } 72 73 /* 74 * Disconnect X.25 protocol from socket. 75 */ 76 77 pk_disconnect (lcp) 78 register struct pklcd *lcp; 79 { 80 register struct socket *so = lcp -> lcd_so; 81 register struct pklcd *l, *p; 82 83 switch (lcp -> lcd_state) { 84 case LISTEN: 85 for (p = 0, l = pk_listenhead; l && l != lcp; p = l, l = l -> lcd_listen); 86 if (p == 0) { 87 if (l != 0) 88 pk_listenhead = l -> lcd_listen; 89 } 90 else 91 if (l != 0) 92 p -> lcd_listen = l -> lcd_listen; 93 pk_close (lcp); 94 break; 95 96 case READY: 97 pk_acct (lcp); 98 pk_close (lcp); 99 break; 100 101 case SENT_CLEAR: 102 case RECEIVED_CLEAR: 103 break; 104 105 default: 106 pk_acct (lcp); 107 if (so) { 108 soisdisconnecting (so); 109 sbflush (&so -> so_rcv); 110 } 111 pk_clear (lcp, 241, 0); /* Normal Disconnect */ 112 113 } 114 } 115 116 /* 117 * Close an X.25 Logical Channel. Discard all space held by the 118 * connection and internal descriptors. Wake up any sleepers. 119 */ 120 121 pk_close (lcp) 122 struct pklcd *lcp; 123 { 124 register struct socket *so = lcp -> lcd_so; 125 126 pk_freelcd (lcp); 127 128 if (so == NULL) 129 return; 130 131 so -> so_pcb = 0; 132 soisdisconnected (so); 133 /* sofree (so); /* gak!!! you can't do that here */ 134 } 135 136 /* 137 * Create a template to be used to send X.25 packets on a logical 138 * channel. It allocates an mbuf and fills in a skeletal packet 139 * depending on its type. This packet is passed to pk_output where 140 * the remainer of the packet is filled in. 141 */ 142 143 struct mbuf * 144 pk_template (lcn, type) 145 int lcn, type; 146 { 147 register struct mbuf *m; 148 register struct x25_packet *xp; 149 150 MGETHDR (m, M_DONTWAIT, MT_HEADER); 151 if (m == 0) 152 panic ("pk_template"); 153 m -> m_act = 0; 154 155 /* 156 * Efficiency hack: leave a four byte gap at the beginning 157 * of the packet level header with the hope that this will 158 * be enough room for the link level to insert its header. 159 */ 160 m -> m_data += max_linkhdr; 161 m -> m_pkthdr.len = m -> m_len = PKHEADERLN; 162 163 xp = mtod (m, struct x25_packet *); 164 *(long *)xp = 0; /* ugly, but fast */ 165 /* xp -> q_bit = 0;*/ 166 xp -> fmt_identifier = 1; 167 /* xp -> lc_group_number = 0;*/ 168 169 SET_LCN(xp, lcn); 170 xp -> packet_type = type; 171 172 return (m); 173 } 174 175 /* 176 * This routine restarts all the virtual circuits. Actually, 177 * the virtual circuits are not "restarted" as such. Instead, 178 * any active switched circuit is simply returned to READY 179 * state. 180 */ 181 182 pk_restart (pkp, restart_cause) 183 register struct pkcb *pkp; 184 int restart_cause; 185 { 186 register struct mbuf *m; 187 register struct pklcd *lcp; 188 register int i; 189 190 /* Restart all logical channels. */ 191 if (pkp -> pk_chan == 0) 192 return; 193 for (i = 1; i <= pkp -> pk_maxlcn; ++i) 194 if ((lcp = pkp -> pk_chan[i]) != NULL) { 195 if (lcp -> lcd_so) { 196 lcp -> lcd_so -> so_error = ENETRESET; 197 pk_close (lcp); 198 } else { 199 pk_flush (lcp); 200 lcp -> lcd_state = READY; 201 if (lcp -> lcd_upper) 202 lcp -> lcd_upper (lcp, 0); 203 } 204 } 205 206 if (restart_cause < 0) 207 return; 208 209 pkp -> pk_state = DTE_SENT_RESTART; 210 lcp = pkp -> pk_chan[0]; 211 m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESTART); 212 m -> m_pkthdr.len = m -> m_len += 2; 213 mtod (m, struct x25_packet *) -> packet_data = 0; /* DTE only */ 214 mtod (m, octet *)[4] = restart_cause; 215 pk_output (lcp); 216 } 217 218 219 /* 220 * This procedure frees up the Logical Channel Descripter. 221 */ 222 223 pk_freelcd (lcp) 224 register struct pklcd *lcp; 225 { 226 if (lcp == NULL) 227 return; 228 229 if (lcp -> lcd_lcn > 0) 230 lcp -> lcd_pkp -> pk_chan[lcp -> lcd_lcn] = NULL; 231 232 pk_flush (lcp); 233 remque (&lcp -> lcd_q); 234 free ((caddr_t)lcp, M_PCB); 235 } 236 237 238 /* 239 * Bind a address and protocol value to a socket. The important 240 * part is the protocol value - the first four characters of the 241 * Call User Data field. 242 */ 243 244 pk_bind (lcp, nam) 245 struct pklcd *lcp; 246 struct mbuf *nam; 247 { 248 register struct pkcb *pkp; 249 register struct pklcd *pp; 250 register struct sockaddr_x25 *sa; 251 252 if (nam == NULL) 253 return (EADDRNOTAVAIL); 254 if (lcp -> lcd_ceaddr) /* XXX */ 255 return (EADDRINUSE); 256 if (pk_checksockaddr (nam)) 257 return (EINVAL); 258 sa = mtod (nam, struct sockaddr_x25 *); 259 260 /* 261 * If the user wishes to accept calls only from a particular 262 * net (net != 0), make sure the net is known 263 */ 264 265 if (sa -> x25_net) 266 for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { 267 if (pkp == 0) 268 return (ENETUNREACH); 269 if (pkp -> pk_xcp -> xc_addr.x25_net == sa -> x25_net) 270 break; 271 } 272 273 /* 274 * For ISO's sake permit default listeners, but only one such . . . 275 */ 276 for (pp = pk_listenhead; pp; pp = pp -> lcd_listen) { 277 register struct sockaddr_x25 *sa2 = pp -> lcd_ceaddr; 278 if ((sa2 -> x25_udlen == sa -> x25_udlen) && 279 (sa2 -> x25_udlen == 0 || 280 (bcmp (sa2 -> x25_udata, sa -> x25_udata, 281 min (sa2 -> x25_udlen, sa -> x25_udlen)) == 0))) 282 return (EADDRINUSE); 283 } 284 lcp -> lcd_laddr = *sa; 285 lcp -> lcd_ceaddr = &lcp -> lcd_laddr; 286 return (0); 287 } 288 289 /* 290 * Include a bound control block in the list of listeners. 291 */ 292 pk_listen (lcp) 293 register struct pklcd *lcp; 294 { 295 register struct pklcd **pp; 296 297 if (lcp -> lcd_ceaddr == 0) 298 return (EDESTADDRREQ); 299 300 lcp -> lcd_state = LISTEN; 301 /* 302 * Add default listener at end, any others at start. 303 */ 304 if (lcp -> lcd_ceaddr -> x25_udlen == 0) { 305 for (pp = &pk_listenhead; *pp; ) 306 pp = &((*pp) -> lcd_listen); 307 *pp = lcp; 308 } else { 309 lcp -> lcd_listen = pk_listenhead; 310 pk_listenhead = lcp; 311 } 312 return (0); 313 } 314 /* 315 * Include a listening control block for the benefit of other protocols. 316 */ 317 pk_protolisten (spi, spilen, callee) 318 int (*callee) (); 319 { 320 register struct pklcd *lcp = pk_attach ((struct socket *)0); 321 register struct mbuf *nam; 322 register struct sockaddr_x25 *sa; 323 int error = ENOBUFS; 324 325 if (lcp) { 326 if (nam = m_getclr (MT_SONAME, M_DONTWAIT)) { 327 sa = mtod (nam, struct sockaddr_x25 *); 328 sa -> x25_family = AF_CCITT; 329 sa -> x25_len = nam -> m_len = sizeof (*sa); 330 sa -> x25_udlen = spilen; 331 sa -> x25_udata[0] = spi; 332 lcp -> lcd_upper = callee; 333 lcp -> lcd_flags = X25_MBS_HOLD; 334 error = pk_bind (lcp, nam) || pk_listen (lcp); 335 (void) m_free (nam); 336 } 337 if (error) 338 pk_freelcd (lcp); 339 } 340 return error; /* Hopefully Zero !*/ 341 } 342 343 /* 344 * Associate a logical channel descriptor with a network. 345 * Fill in the default network specific parameters and then 346 * set any parameters explicitly specified by the user or 347 * by the remote DTE. 348 */ 349 350 pk_assoc (pkp, lcp, sa) 351 register struct pkcb *pkp; 352 register struct pklcd *lcp; 353 register struct sockaddr_x25 *sa; 354 { 355 356 lcp -> lcd_pkp = pkp; 357 lcp -> lcd_packetsize = pkp -> pk_xcp -> xc_psize; 358 lcp -> lcd_windowsize = pkp -> pk_xcp -> xc_pwsize; 359 lcp -> lcd_rsn = MODULUS - 1; 360 pkp -> pk_chan[lcp -> lcd_lcn] = lcp; 361 362 if (sa -> x25_opts.op_psize) 363 lcp -> lcd_packetsize = sa -> x25_opts.op_psize; 364 else 365 sa -> x25_opts.op_psize = lcp -> lcd_packetsize; 366 if (sa -> x25_opts.op_wsize) 367 lcp -> lcd_windowsize = sa -> x25_opts.op_wsize; 368 else 369 sa -> x25_opts.op_wsize = lcp -> lcd_windowsize; 370 sa -> x25_net = pkp -> pk_xcp -> xc_addr.x25_net; 371 lcp -> lcd_flags = sa -> x25_opts.op_flags; 372 lcp -> lcd_stime = time.tv_sec; 373 } 374 375 pk_connect (lcp, sa) 376 register struct pklcd *lcp; 377 register struct sockaddr_x25 *sa; 378 { 379 register struct pkcb *pkp; 380 381 if (sa -> x25_addr[0] == '\0') 382 return (EDESTADDRREQ); 383 if (lcp -> lcd_pkp == 0) 384 for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { 385 if (pkp == 0) 386 return (ENETUNREACH); 387 /* 388 * use first net configured (last in list 389 * headed by pkcbhead) if net is zero 390 */ 391 if (sa -> x25_net == 0 && pkp -> pk_next == 0) 392 break; 393 if (sa -> x25_net == pkp -> pk_xcp -> xc_addr.x25_net) 394 break; 395 } 396 397 if (pkp -> pk_state != DTE_READY) 398 return (ENETDOWN); 399 if ((lcp -> lcd_lcn = pk_getlcn (pkp)) == 0) 400 return (EMFILE); 401 lcp -> lcd_faddr = *sa; 402 lcp -> lcd_ceaddr = & lcp -> lcd_faddr; 403 pk_assoc (pkp, lcp, lcp -> lcd_ceaddr); 404 if (lcp -> lcd_so) 405 soisconnecting (lcp -> lcd_so); 406 lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CALL); 407 pk_callrequest (lcp, lcp -> lcd_ceaddr, pkp -> pk_xcp); 408 return (*pkp -> pk_start) (lcp); 409 } 410 411 /* 412 * Build the rest of the CALL REQUEST packet. Fill in calling 413 * address, facilities fields and the user data field. 414 */ 415 416 pk_callrequest (lcp, sa, xcp) 417 struct pklcd *lcp; 418 register struct sockaddr_x25 *sa; 419 register struct x25config *xcp; 420 { 421 register struct x25_calladdr *a; 422 register struct mbuf *m = lcp -> lcd_template; 423 register struct x25_packet *xp = mtod (m, struct x25_packet *); 424 unsigned posn = 0; 425 octet *cp; 426 427 if (lcp -> lcd_flags & X25_DBIT) 428 xp -> d_bit = 1; 429 a = (struct x25_calladdr *) &xp -> packet_data; 430 a -> calling_addrlen = strlen (xcp -> xc_addr.x25_addr); 431 a -> called_addrlen = strlen (sa -> x25_addr); 432 cp = (octet *) a -> address_field; 433 to_bcd (&cp, (int)a -> called_addrlen, sa -> x25_addr, &posn); 434 to_bcd (&cp, (int)a -> calling_addrlen, xcp -> xc_addr.x25_addr, &posn); 435 if (posn & 0x01) 436 *cp++ &= 0xf0; 437 m -> m_pkthdr.len = m -> m_len += cp - (octet *) a; 438 439 if (lcp -> lcd_facilities) { 440 m -> m_pkthdr.len += 441 (m -> m_next = lcp -> lcd_facilities) -> m_len; 442 lcp -> lcd_facilities = 0; 443 } else 444 build_facilities (m, sa, (int)xcp -> xc_type); 445 446 m_copyback (m, m -> m_pkthdr.len, sa -> x25_udlen, sa -> x25_udata); 447 #ifdef ANDREW 448 printf ("call: "); 449 for (cp = mtod (m, octet *), posn = 0; posn < m -> m_len; ++posn) 450 printf ("%x ", *cp++); 451 printf ("\n"); 452 #endif 453 } 454 455 static 456 build_facilities (m, sa, type) 457 register struct mbuf *m; 458 struct sockaddr_x25 *sa; 459 { 460 register octet *cp; 461 register octet *fcp; 462 register int revcharge; 463 464 cp = mtod (m, octet *) + m -> m_len; 465 fcp = cp + 1; 466 revcharge = sa -> x25_opts.op_flags & X25_REVERSE_CHARGE ? 1 : 0; 467 /* 468 * This is specific to Datapac X.25(1976) DTEs. International 469 * calls must have the "hi priority" bit on. 470 */ 471 if (type == X25_1976 && sa -> x25_opts.op_psize == X25_PS128) 472 revcharge |= 02; 473 if (revcharge) { 474 *fcp++ = FACILITIES_REVERSE_CHARGE; 475 *fcp++ = revcharge; 476 } 477 switch (type) { 478 case X25_1980: 479 case X25_1984: 480 *fcp++ = FACILITIES_PACKETSIZE; 481 *fcp++ = sa -> x25_opts.op_psize; 482 *fcp++ = sa -> x25_opts.op_psize; 483 484 *fcp++ = FACILITIES_WINDOWSIZE; 485 *fcp++ = sa -> x25_opts.op_wsize; 486 *fcp++ = sa -> x25_opts.op_wsize; 487 } 488 *cp = fcp - cp - 1; 489 m -> m_pkthdr.len = (m -> m_len += *cp + 1); 490 } 491 492 to_bcd (a, len, x, posn) 493 register octet **a; 494 register char *x; 495 register int len; 496 register unsigned *posn; 497 { 498 while (--len >= 0) 499 if ((*posn)++ & 0x01) 500 *(*a)++ |= *x++ & 0x0F; 501 else 502 **a = *x++ << 4; 503 } 504 505 /* 506 * This routine gets the first available logical channel number. The 507 * search is from the highest number to lowest number (DTE). 508 */ 509 510 pk_getlcn (pkp) 511 register struct pkcb *pkp; 512 { 513 register int i; 514 515 if (pkp -> pk_chan == 0) 516 return (0); 517 for (i = pkp -> pk_maxlcn; i > 0; --i) 518 if (pkp -> pk_chan[i] == NULL) 519 break; 520 return (i); 521 522 } 523 524 /* 525 * This procedure sends a CLEAR request packet. The lc state is 526 * set to "SENT_CLEAR". 527 */ 528 529 pk_clear (lcp, diagnostic, abortive) 530 register struct pklcd *lcp; 531 { 532 register struct mbuf *m = pk_template (lcp -> lcd_lcn, X25_CLEAR); 533 534 m -> m_len += 2; 535 mtod (m, struct x25_packet *) -> packet_data = 0; 536 mtod (m, octet *)[4] = diagnostic; 537 if (lcp -> lcd_facilities) { 538 m -> m_next = lcp -> lcd_facilities; 539 m -> m_pkthdr.len += m -> m_next -> m_len; 540 lcp -> lcd_facilities = 0; 541 } 542 if (abortive) 543 lcp -> lcd_template = m; 544 else { 545 struct socket *so = lcp -> lcd_so; 546 struct sockbuf *sb = so ? & so -> so_snd : & lcp -> lcd_sb; 547 sbappendrecord (sb, m); 548 } 549 pk_output (lcp); 550 551 } 552 553 /* 554 * This procedure generates RNR's or RR's to inhibit or enable 555 * inward data flow, if the current state changes (blocked ==> open or 556 * vice versa), or if forced to generate one. One forces RNR's to ack data. 557 */ 558 pk_flowcontrol (lcp, inhibit, forced) 559 register struct pklcd *lcp; 560 { 561 inhibit = (inhibit != 0); 562 if (lcp == 0 || lcp -> lcd_state != DATA_TRANSFER || 563 (forced == 0 && lcp -> lcd_rxrnr_condition == inhibit)) 564 return; 565 lcp -> lcd_rxrnr_condition = inhibit; 566 lcp -> lcd_template = pk_template (lcp -> lcd_lcn, inhibit ? RNR : RR); 567 pk_output (lcp); 568 } 569 570 /* 571 * This procedure sends a RESET request packet. It re-intializes 572 * virtual circuit. 573 */ 574 575 static 576 pk_reset (lcp, diagnostic) 577 register struct pklcd *lcp; 578 { 579 register struct mbuf *m; 580 register struct socket *so = lcp -> lcd_so; 581 582 if (lcp -> lcd_state != DATA_TRANSFER) 583 return; 584 585 if (so) 586 so -> so_error = ECONNRESET; 587 lcp -> lcd_reset_condition = TRUE; 588 589 /* Reset all the control variables for the channel. */ 590 pk_flush (lcp); 591 lcp -> lcd_window_condition = lcp -> lcd_rnr_condition = 592 lcp -> lcd_intrconf_pending = FALSE; 593 lcp -> lcd_rsn = MODULUS - 1; 594 lcp -> lcd_ssn = 0; 595 lcp -> lcd_output_window = lcp -> lcd_input_window = 596 lcp -> lcd_last_transmitted_pr = 0; 597 m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESET); 598 m -> m_pkthdr.len = m -> m_len += 2; 599 mtod (m, struct x25_packet *) -> packet_data = 0; 600 mtod (m, octet *)[4] = diagnostic; 601 pk_output (lcp); 602 603 } 604 605 /* 606 * This procedure frees all data queued for output or delivery on a 607 * virtual circuit. 608 */ 609 610 pk_flush (lcp) 611 register struct pklcd *lcp; 612 { 613 register struct socket *so; 614 615 if (lcp -> lcd_template) 616 m_freem (lcp -> lcd_template); 617 618 if (lcp -> lcd_cps) { 619 m_freem (lcp -> lcd_cps); 620 lcp -> lcd_cps = 0; 621 } 622 if (lcp -> lcd_facilities) { 623 m_freem (lcp -> lcd_facilities); 624 lcp -> lcd_facilities = 0; 625 } 626 if (so = lcp -> lcd_so) { 627 sbflush (&so -> so_rcv); 628 sbflush (&so -> so_snd); 629 } else 630 sbflush (&lcp -> lcd_sb); 631 } 632 633 /* 634 * This procedure handles all local protocol procedure errors. 635 */ 636 637 pk_procerror (error, lcp, errstr, diagnostic) 638 register struct pklcd *lcp; 639 char *errstr; 640 { 641 642 pk_message (lcp -> lcd_lcn, lcp -> lcd_pkp -> pk_xcp, errstr); 643 644 switch (error) { 645 case CLEAR: 646 if (lcp -> lcd_so) { 647 lcp -> lcd_so -> so_error = ECONNABORTED; 648 soisdisconnecting (lcp -> lcd_so); 649 } 650 pk_clear (lcp, diagnostic, 1); 651 break; 652 653 case RESET: 654 pk_reset (lcp, diagnostic); 655 } 656 } 657 658 /* 659 * This procedure is called during the DATA TRANSFER state to check 660 * and process the P(R) values received in the DATA, RR OR RNR 661 * packets. 662 */ 663 664 pk_ack (lcp, pr) 665 struct pklcd *lcp; 666 unsigned pr; 667 { 668 register struct socket *so = lcp -> lcd_so; 669 670 if (lcp -> lcd_output_window == pr) 671 return (PACKET_OK); 672 if (lcp -> lcd_output_window < lcp -> lcd_ssn) { 673 if (pr < lcp -> lcd_output_window || pr > lcp -> lcd_ssn) { 674 pk_procerror (RESET, lcp, 675 "p(r) flow control error", 2); 676 return (ERROR_PACKET); 677 } 678 } 679 else { 680 if (pr < lcp -> lcd_output_window && pr > lcp -> lcd_ssn) { 681 pk_procerror (RESET, lcp, 682 "p(r) flow control error #2", 2); 683 return (ERROR_PACKET); 684 } 685 } 686 687 lcp -> lcd_output_window = pr; /* Rotate window. */ 688 if (lcp -> lcd_window_condition == TRUE) 689 lcp -> lcd_window_condition = FALSE; 690 691 if (so && ((so -> so_snd.sb_flags & SB_WAIT) || so -> so_snd.sb_sel)) 692 sowwakeup (so); 693 694 return (PACKET_OK); 695 } 696 697 /* 698 * This procedure decodes the X.25 level 3 packet returning a 699 * code to be used in switchs or arrays. 700 */ 701 702 pk_decode (xp) 703 register struct x25_packet *xp; 704 { 705 register int type; 706 707 if (xp -> fmt_identifier != 1) 708 return (INVALID_PACKET); 709 #ifdef ancient_history 710 /* 711 * Make sure that the logical channel group number is 0. 712 * This restriction may be removed at some later date. 713 */ 714 if (xp -> lc_group_number != 0) 715 return (INVALID_PACKET); 716 #endif 717 /* 718 * Test for data packet first. 719 */ 720 if (!(xp -> packet_type & DATA_PACKET_DESIGNATOR)) 721 return (DATA); 722 723 /* 724 * Test if flow control packet (RR or RNR). 725 */ 726 if (!(xp -> packet_type & RR_OR_RNR_PACKET_DESIGNATOR)) 727 switch (xp -> packet_type & 0x1f) { 728 case X25_RR: 729 return (RR); 730 case X25_RNR: 731 return (RNR); 732 case X25_REJECT: 733 return (REJECT); 734 } 735 736 /* 737 * Determine the rest of the packet types. 738 */ 739 switch (xp -> packet_type) { 740 case X25_CALL: 741 type = CALL; 742 break; 743 744 case X25_CALL_ACCEPTED: 745 type = CALL_ACCEPTED; 746 break; 747 748 case X25_CLEAR: 749 type = CLEAR; 750 break; 751 752 case X25_CLEAR_CONFIRM: 753 type = CLEAR_CONF; 754 break; 755 756 case X25_INTERRUPT: 757 type = INTERRUPT; 758 break; 759 760 case X25_INTERRUPT_CONFIRM: 761 type = INTERRUPT_CONF; 762 break; 763 764 case X25_RESET: 765 type = RESET; 766 break; 767 768 case X25_RESET_CONFIRM: 769 type = RESET_CONF; 770 break; 771 772 case X25_RESTART: 773 type = RESTART; 774 break; 775 776 case X25_RESTART_CONFIRM: 777 type = RESTART_CONF; 778 break; 779 780 case X25_DIAGNOSTIC: 781 type = DIAG_TYPE; 782 break; 783 784 default: 785 type = INVALID_PACKET; 786 } 787 return (type); 788 } 789 790 /* 791 * A restart packet has been received. Print out the reason 792 * for the restart. 793 */ 794 795 pk_restartcause (pkp, xp) 796 struct pkcb *pkp; 797 register struct x25_packet *xp; 798 { 799 register struct x25config *xcp = pkp -> pk_xcp; 800 register int lcn = LCN(xp); 801 802 switch (xp -> packet_data) { 803 case X25_RESTART_LOCAL_PROCEDURE_ERROR: 804 pk_message (lcn, xcp, "restart: local procedure error"); 805 break; 806 807 case X25_RESTART_NETWORK_CONGESTION: 808 pk_message (lcn, xcp, "restart: network congestion"); 809 break; 810 811 case X25_RESTART_NETWORK_OPERATIONAL: 812 pk_message (lcn, xcp, "restart: network operational"); 813 break; 814 815 default: 816 pk_message (lcn, xcp, "restart: unknown cause"); 817 } 818 } 819 820 #define MAXRESETCAUSE 7 821 822 int Reset_cause[] = { 823 EXRESET, EXROUT, 0, EXRRPE, 0, EXRLPE, 0, EXRNCG 824 }; 825 826 /* 827 * A reset packet has arrived. Return the cause to the user. 828 */ 829 830 pk_resetcause (pkp, xp) 831 struct pkcb *pkp; 832 register struct x25_packet *xp; 833 { 834 register struct pklcd *lcp = 835 pkp -> pk_chan[LCN(xp)]; 836 register int code = xp -> packet_data; 837 838 if (code > MAXRESETCAUSE) 839 code = 7; /* EXRNCG */ 840 841 pk_message(LCN(xp), lcp -> lcd_pkp, "reset code 0x%x, diagnostic 0x%x", 842 xp -> packet_data, 4[(u_char *)xp]); 843 844 lcp -> lcd_so -> so_error = Reset_cause[code]; 845 } 846 847 #define MAXCLEARCAUSE 25 848 849 int Clear_cause[] = { 850 EXCLEAR, EXCBUSY, 0, EXCINV, 0, EXCNCG, 0, 851 0, 0, EXCOUT, 0, EXCAB, 0, EXCNOB, 0, 0, 0, EXCRPE, 852 0, EXCLPE, 0, 0, 0, 0, 0, EXCRRC 853 }; 854 855 /* 856 * A clear packet has arrived. Return the cause to the user. 857 */ 858 859 pk_clearcause (pkp, xp) 860 struct pkcb *pkp; 861 register struct x25_packet *xp; 862 { 863 register struct pklcd *lcp = 864 pkp -> pk_chan[LCN(xp)]; 865 register int code = xp -> packet_data; 866 867 if (code > MAXCLEARCAUSE) 868 code = 5; /* EXRNCG */ 869 if (lcp -> lcd_so) 870 lcp -> lcd_so -> so_error = Clear_cause[code]; 871 } 872 873 char * 874 format_ntn (xcp) 875 register struct x25config *xcp; 876 { 877 878 return (xcp -> xc_addr.x25_addr); 879 } 880 881 /* VARARGS1 */ 882 pk_message (lcn, xcp, fmt, a1, a2, a3, a4, a5, a6) 883 struct x25config *xcp; 884 char *fmt; 885 { 886 887 if (lcn) 888 if (pkcbhead -> pk_next) 889 printf ("X.25(%s): lcn %d: ", format_ntn (xcp), lcn); 890 else 891 printf ("X.25: lcn %d: ", lcn); 892 else 893 if (pkcbhead -> pk_next) 894 printf ("X.25(%s): ", format_ntn (xcp)); 895 else 896 printf ("X.25: "); 897 898 printf (fmt, a1, a2, a3, a4, a5, a6); 899 printf ("\n"); 900 } 901 902 pk_ifattach (ia, lloutput, llnext) 903 register struct x25_ifaddr *ia; 904 int (*lloutput) (); 905 caddr_t llnext; 906 { 907 /* this is here because you can't include both pk_var and hd_var */ 908 /* this will probably be replace by a streams gluing mechanism */ 909 ia -> ia_pkcb.pk_lloutput = lloutput; 910 ia -> ia_pkcb.pk_llnext = llnext; 911 } 912 913 pk_fragment (lcp, m0, qbit, mbit, wait) 914 struct mbuf *m0; 915 register struct pklcd *lcp; 916 { 917 register struct mbuf *m = m0; 918 register struct x25_packet *xp; 919 register struct sockbuf *sb; 920 struct mbuf *head = 0, *next, **mp = &head, *m_split (); 921 int totlen, psize = 1 << (lcp -> lcd_packetsize); 922 923 if (m == 0) 924 return 0; 925 if (m -> m_flags & M_PKTHDR == 0) 926 panic ("pk_fragment"); 927 totlen = m -> m_pkthdr.len; 928 m -> m_act = 0; 929 sb = lcp -> lcd_so ? &lcp -> lcd_so -> so_snd : & lcp -> lcd_sb; 930 do { 931 if (totlen > psize) { 932 if ((next = m_split (m, psize, wait)) == 0) 933 goto abort; 934 totlen -= psize; 935 } else 936 next = 0; 937 M_PREPEND(m, PKHEADERLN, wait); 938 if (m == 0) 939 goto abort; 940 *mp = m; 941 mp = & m -> m_act; 942 *mp = 0; 943 xp = mtod (m, struct x25_packet *); 944 0[(char *)xp] = 0; 945 if (qbit) 946 xp -> q_bit = 1; 947 if (lcp -> lcd_flags & X25_DBIT) 948 xp -> d_bit = 1; 949 xp -> fmt_identifier = 1; 950 xp -> packet_type = X25_DATA; 951 SET_LCN(xp, lcp -> lcd_lcn); 952 if (next || (mbit && (totlen == psize || 953 (lcp -> lcd_flags & X25_DBIT)))) 954 MBIT(xp) = 1; 955 } while (m = next); 956 for (m = head; m; m = next) { 957 next = m -> m_act; 958 m -> m_act = 0; 959 sbappendrecord (sb, m); 960 } 961 return 0; 962 abort: 963 if (wait) 964 panic ("pk_fragment null mbuf after wait"); 965 if (next) 966 m_freem (next); 967 for (m = head; m; m = next) { 968 next = m -> m_act; 969 m_freem (m); 970 } 971 return ENOBUFS; 972 } 973 974 struct mbuf * 975 m_split (m0, len0, wait) 976 register struct mbuf *m0; 977 int len0; 978 { 979 register struct mbuf *m, *n; 980 unsigned len = len0; 981 982 for (m = m0; m && len > m -> m_len; m = m -> m_next) 983 len -= m -> m_len; 984 if (m == 0) 985 return (0); 986 if (m0 -> m_flags & M_PKTHDR) { 987 MGETHDR(n, wait, m0 -> m_type); 988 if (n == 0) 989 return (0); 990 n -> m_pkthdr.rcvif = m0 -> m_pkthdr.rcvif; 991 n -> m_pkthdr.len = m0 -> m_pkthdr.len - len0; 992 m0 -> m_pkthdr.len = len0; 993 if (m -> m_flags & M_EXT) 994 goto extpacket; 995 if (len > MHLEN) { 996 /* m can't be the lead packet */ 997 MH_ALIGN(n, 0); 998 n -> m_next = m_split (m, len, wait); 999 if (n -> m_next == 0) { 1000 (void) m_free (n); 1001 return (0); 1002 } else 1003 return (n); 1004 } else 1005 MH_ALIGN(n, len); 1006 } else if (len == m -> m_len) { 1007 n = m -> m_next; 1008 m -> m_next = 0; 1009 return (n); 1010 } 1011 extpacket: 1012 len = m -> m_len - len; /* remainder to be copied */ 1013 m -> m_len -= len; /* now equals original len */ 1014 if (m -> m_flags & M_EXT) { 1015 n -> m_flags |= M_EXT; 1016 n -> m_ext = m -> m_ext; 1017 mclrefcnt[mtocl (m -> m_ext.ext_buf)]++; 1018 n -> m_data = m -> m_data + m -> m_len; 1019 } else { 1020 MGET(n, wait, m -> m_type); 1021 if (n == 0) { 1022 m -> m_len += len; 1023 return (0); 1024 } 1025 M_ALIGN(n, len); 1026 bcopy (mtod (m, caddr_t), mtod (n, caddr_t), len); 1027 } 1028 n -> m_len = len; 1029 n -> m_next = m -> m_next; 1030 m -> m_next = 0; 1031 return (n); 1032 } 1033