1 /* 2 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)if_imp.c 7.11 (Berkeley) 04/25/89 18 */ 19 20 #include "imp.h" 21 #if NIMP > 0 22 /* 23 * ARPANET IMP (PSN) interface driver. 24 * 25 * The IMP-host protocol (AHIP) is handled here, leaving 26 * hardware specifics to the lower level interface driver. 27 */ 28 #include "param.h" 29 #include "systm.h" 30 #include "mbuf.h" 31 #include "buf.h" 32 #include "protosw.h" 33 #include "socket.h" 34 #include "time.h" 35 #include "kernel.h" 36 #include "errno.h" 37 #include "ioctl.h" 38 #include "syslog.h" 39 40 #include "machine/mtpr.h" 41 42 #include "../net/if.h" 43 #include "../net/netisr.h" 44 #include "../netinet/in.h" 45 #include "../netinet/in_systm.h" 46 #include "../netinet/in_var.h" 47 #include "../netinet/ip.h" 48 #include "../netinet/ip_var.h" 49 #define IMPMESSAGES 50 /* define IMPLEADERS here to get leader printing code */ 51 #include "if_imp.h" 52 #include "if_imphost.h" 53 54 struct imp_softc imp_softc[NIMP]; 55 #ifndef lint 56 int nimp = NIMP; /* for netstat */ 57 #endif 58 struct ifqueue impintrq; 59 int impqmaxlen = IFQ_MAXLEN; 60 int imphqlen = 12 + IMP_MAXHOSTMSG; /* max packets to queue per host */ 61 62 int imppri = LOG_ERR; 63 #ifdef IMPLEADERS 64 int impprintfs = 0; 65 #endif 66 #ifdef IMPINIT 67 int imptraceinit = 0; 68 #endif 69 70 71 #define HOSTDEADTIMER (30 * PR_SLOWHZ) /* How long to wait when down */ 72 73 int impdown(), impinit(), impioctl(), impoutput(), imptimo(); 74 75 /* 76 * IMP attach routine. Called from hardware device attach routine 77 * at configuration time with a pointer to the device structure. 78 * Sets up local state and returns pointer to base of ifnet+impcb 79 * structures. This is then used by the device's attach routine 80 * set up its back pointers. 81 */ 82 struct imp_softc * 83 impattach(hwname, hwunit, reset) 84 char *hwname; 85 int hwunit; 86 int (*reset)(); 87 { 88 struct imp_softc *sc; 89 register struct ifnet *ifp; 90 static int impunit; 91 92 #ifdef lint 93 impintr(); 94 #endif 95 if (impunit >= NIMP) { 96 printf("imp%d: not configured\n", impunit++); 97 return (0); 98 } 99 sc = &imp_softc[impunit]; 100 ifp = &sc->imp_if; 101 sc->imp_cb.ic_hwname = hwname; 102 sc->imp_cb.ic_hwunit = hwunit; 103 ifp->if_unit = impunit; 104 ifp->if_name = "imp"; 105 ifp->if_mtu = IMPMTU - sizeof(struct imp_leader); 106 ifp->if_reset = reset; 107 ifp->if_init = impinit; 108 ifp->if_ioctl = impioctl; 109 ifp->if_output = impoutput; 110 ifp->if_watchdog = imptimo; 111 if_attach(ifp); 112 impunit++; 113 return (sc); 114 } 115 116 /* 117 * IMP initialization routine: call hardware module to 118 * setup resources, init state and get ready for 119 * NOOPs the IMP should send us, and that we want to drop. 120 */ 121 impinit(unit) 122 int unit; 123 { 124 int s; 125 register struct imp_softc *sc = &imp_softc[unit]; 126 127 if (sc->imp_if.if_addrlist == 0) 128 return; 129 s = splimp(); 130 #ifdef IMPINIT 131 if (imptraceinit) 132 log(imppri, "impinit\n"); 133 #endif 134 sc->imp_state = IMPS_WINIT; 135 if ((*sc->imp_cb.ic_init)(sc->imp_cb.ic_hwunit) == 0) 136 sc->imp_if.if_flags &= ~IFF_UP; 137 impintrq.ifq_maxlen = impqmaxlen; 138 splx(s); 139 } 140 141 /* 142 * ARPAnet 1822/AHIP input routine. 143 * Called from hardware input interrupt routine to handle 1822 144 * IMP-host messages. Data messages are passed to higher-level 145 * protocol processors on the basis of link number. 146 * Other type messages (control) are handled here. 147 */ 148 impinput(unit, m) 149 int unit; 150 register struct mbuf *m; 151 { 152 register struct control_leader *cp; 153 #define ip ((struct imp_leader *)cp) 154 register struct imp_softc *sc = &imp_softc[unit]; 155 struct ifnet *ifp; 156 register struct host *hp; 157 register struct ifqueue *inq; 158 struct sockaddr_in *sin; 159 int s; 160 161 /* 162 * Pull the interface pointer out of the mbuf 163 * and save for later; adjust mbuf to look at rest of data. 164 */ 165 if ((m->m_flags && M_PKTHDR) == 0) 166 panic("No header in impinput"); 167 ifp = m->m_pkthdr.rcvif; 168 /* verify leader length. */ 169 if (m->m_len < sizeof(struct control_leader) && 170 (m = m_pullup(m, sizeof(struct control_leader))) == 0) 171 return; 172 cp = mtod(m, struct control_leader *); 173 if (cp->dl_mtype == IMPTYPE_DATA && 174 m->m_len < sizeof(struct imp_leader)) { 175 if ((m = m_pullup(m, sizeof(struct imp_leader))) == 0) 176 return; 177 cp = mtod(m, struct control_leader *); 178 } 179 #ifdef IMPLEADERS 180 if (impprintfs) 181 printleader("impinput", ip); 182 #endif 183 inq = &impintrq; 184 185 /* check leader type */ 186 if (cp->dl_format != IMP_NFF) { 187 /* 188 * We get 1822L NOOPs and RESET 189 * at initialization. 190 */ 191 #ifdef IMPINIT 192 if (imptraceinit) 193 log(imppri, "input, format %x mtype %d\n", 194 cp->dl_format, cp->dl_mtype); 195 #endif 196 if (cp->dl_format != IMP_1822L_I2H || 197 (cp->dl_mtype != IMPTYPE_NOOP && 198 cp->dl_mtype != IMPTYPE_RESET)) { 199 sc->imp_garbage++; 200 sc->imp_if.if_collisions++; /* XXX */ 201 } 202 } else switch (cp->dl_mtype) { 203 204 case IMPTYPE_DATA: 205 /* 206 * Data for a protocol. Dispatch to the appropriate 207 * protocol routine (running at software interrupt). 208 * If this isn't a raw interface, advance pointer 209 * into mbuf past leader. 210 */ 211 switch (cp->dl_link) { 212 213 case IMPLINK_IP: 214 m->m_len -= sizeof(struct imp_leader); 215 if (m->m_flags & M_PKTHDR) 216 m->m_pkthdr.len -= sizeof(struct imp_leader); 217 m->m_data += sizeof(struct imp_leader); 218 schednetisr(NETISR_IP); 219 inq = &ipintrq; 220 break; 221 222 default: 223 break; 224 } 225 break; 226 227 /* 228 * IMP leader error. Reset the IMP and discard the packet. 229 */ 230 case IMPTYPE_BADLEADER: 231 /* 232 * According to 1822 document, this message 233 * will be generated in response to the 234 * first noop sent to the IMP after 235 * the host resets the IMP interface. 236 */ 237 #ifdef IMPINIT 238 if (imptraceinit) 239 log(imppri, "badleader\n"); 240 #endif 241 if (sc->imp_state != IMPS_INIT) { 242 impmsg(sc, "leader error"); 243 sc->imp_msgready = 0; 244 hostreset(unit); 245 impnoops(sc); 246 sc->imp_garbage++; 247 } 248 break; 249 250 /* 251 * IMP going down. Print message, and if not immediate, 252 * set off a timer to insure things will be reset at the 253 * appropriate time. 254 */ 255 case IMPTYPE_DOWN: 256 { int type, when; 257 258 type = cp->dl_link & IMP_DMASK; 259 when = (cp->dl_link & IMPDOWN_WHENMASK) >> IMPDOWN_WHENSHIFT; 260 #ifdef IMPINIT 261 if (imptraceinit) 262 log(imppri, "input DOWN %s %d\n", 263 impmessage[type], when * IMPDOWN_WHENUNIT); 264 #endif 265 if (type != IMPDOWN_GOING && when) 266 impmsg(sc, "going down %s in %d minutes", 267 (u_int)impmessage[type], when * IMPDOWN_WHENUNIT); 268 else 269 impmsg(sc, "going down %s", (u_int)impmessage[type]); 270 if (sc->imp_state != IMPS_UP) 271 break; 272 if (type == IMPDOWN_GOING) { 273 sc->imp_state = IMPS_GOINGDOWN; 274 timeout(impdown, (caddr_t)sc, IMPTV_DOWN * hz); 275 } else if (when == 0) 276 sc->imp_state = IMPS_WINIT; 277 sc->imp_dropcnt = 0; 278 break; 279 } 280 281 /* 282 * A NOP, usually seen during the initialization sequence. 283 * Compare the local address with that in the message. 284 * Reset the local address notion if it doesn't match. 285 */ 286 case IMPTYPE_NOOP: 287 #ifdef IMPINIT 288 if (imptraceinit) 289 log(imppri, "noop\n"); 290 #endif 291 if (sc->imp_state == IMPS_WINIT) { 292 sc->imp_dropcnt = 0; 293 impnoops(sc); 294 sc->imp_state = IMPS_INIT; 295 } 296 sc->imp_dropcnt++; 297 if (sc->imp_state == IMPS_INIT && cp->dl_imp != 0) { 298 struct in_addr leader_addr; 299 300 sin = (struct sockaddr_in *)&sc->imp_if.if_addrlist->ifa_addr; 301 imp_leader_to_addr(&leader_addr, cp, &sc->imp_if); 302 if (sin->sin_addr.s_addr != leader_addr.s_addr) { 303 impmsg(sc, "address reset to x%x (%d/%d)", 304 ntohl(leader_addr.s_addr), 305 (u_int)cp->dl_host, 306 ntohs(cp->dl_imp)); 307 sin->sin_addr.s_addr = leader_addr.s_addr; 308 } 309 } 310 break; 311 312 /* 313 * RFNM or INCOMPLETE message, decrement rfnm count 314 * and prepare to send next message. 315 * If the rfnm allows another queued 316 * message to be sent, bump msgready 317 * and start IMP if idle. 318 * We could pass incomplete's up to the next level, 319 * but this currently isn't needed. 320 * Pass "bad" incompletes and rfnms to the raw socket. 321 */ 322 case IMPTYPE_INCOMPLETE: 323 sc->imp_incomplete++; 324 /* FALL THROUGH */ 325 case IMPTYPE_RFNM: 326 if ((hp = hostlookup((int)cp->dl_imp, (int)cp->dl_host, 327 unit)) == 0 || hp->h_rfnm == 0) { 328 sc->imp_badrfnm++; 329 if (hp) 330 hostfree(hp); 331 break; 332 } 333 imprestarthost(sc, hp); 334 if (cp->dl_mtype == IMPTYPE_RFNM) 335 goto drop; 336 break; 337 338 /* 339 * Host or IMP can't be reached. Flush any packets 340 * awaiting transmission and release the host structure. 341 * Enqueue for notifying protocols at software interrupt time. 342 */ 343 case IMPTYPE_HOSTDEAD: 344 case IMPTYPE_HOSTUNREACH: 345 if (hp = hostlookup((int)cp->dl_imp, (int)cp->dl_host, unit)) { 346 hp->h_flags |= (1 << (int)cp->dl_mtype); 347 sc->imp_msgready -= 348 MIN(hp->h_qcnt, IMP_MAXHOSTMSG - hp->h_rfnm); 349 hp->h_rfnm = 0; 350 hostflush(hp); 351 hp->h_timer = HOSTDEADTIMER; 352 } 353 break; 354 355 /* 356 * Error in data. Clear RFNM status for this host and send 357 * noops to the IMP to clear the interface. 358 */ 359 case IMPTYPE_BADDATA: 360 impmsg(sc, "data error"); 361 if (hp = hostlookup((int)cp->dl_imp, (int)cp->dl_host, unit)) { 362 sc->imp_msgready -= 363 MIN(hp->h_qcnt, IMP_MAXHOSTMSG - hp->h_rfnm); 364 if (hp->h_rfnm) 365 hostrelease(hp); 366 else 367 hostfree(hp); 368 } 369 impnoops(sc); 370 break; 371 372 /* 373 * Interface reset. 374 */ 375 case IMPTYPE_RESET: 376 #ifdef IMPINIT 377 if (imptraceinit) 378 log(imppri, "reset complete\n"); 379 #endif 380 if (sc->imp_state != IMPS_INIT) { 381 impmsg(sc, "interface reset"); 382 impnoops(sc); 383 } 384 /* clear RFNM counts */ 385 sc->imp_msgready = 0; 386 hostreset(unit); 387 if (sc->imp_state != IMPS_DOWN) { 388 sc->imp_state = IMPS_UP; 389 sc->imp_if.if_flags |= IFF_UP; 390 #ifdef IMPINIT 391 if (imptraceinit) 392 log(imppri, "IMP UP\n"); 393 #endif 394 } 395 break; 396 397 default: 398 sc->imp_garbage++; 399 sc->imp_if.if_collisions++; /* XXX */ 400 break; 401 } 402 403 if (inq == &impintrq) 404 schednetisr(NETISR_IMP); 405 s = splimp(); 406 if (!IF_QFULL(inq)) { 407 IF_ENQUEUE(inq, m); 408 splx(s); 409 return; 410 } 411 splx(s); 412 IF_DROP(inq); 413 drop: 414 m_freem(m); 415 #undef ip 416 } 417 418 /* 419 * Bring the IMP down after notification. 420 */ 421 impdown(sc) 422 struct imp_softc *sc; 423 { 424 int s = splimp(); 425 426 if (sc->imp_state == IMPS_GOINGDOWN) { 427 sc->imp_state = IMPS_WINIT; 428 impmsg(sc, "marked down"); 429 sc->imp_msgready = 0; 430 hostreset(sc->imp_if.if_unit); 431 if_down(&sc->imp_if); 432 } 433 #ifdef IMPINIT 434 else if (imptraceinit) 435 log(imppri, "impdown, state now %d (ignored)\n", sc->imp_state); 436 #endif 437 splx(s); 438 } 439 440 /*VARARGS2*/ 441 impmsg(sc, fmt, a1) 442 struct imp_softc *sc; 443 char *fmt; 444 u_int a1; 445 { 446 447 log(imppri, "imp%d: %r\n", sc->imp_if.if_unit, fmt, &a1); 448 } 449 450 struct sockproto impproto = { PF_IMPLINK }; 451 struct sockaddr_in impdst = { sizeof (impdst), AF_IMPLINK }; 452 struct sockaddr_in impsrc = { sizeof (impsrc), AF_IMPLINK }; 453 454 /* 455 * Pick up the IMP "error" messages enqueued earlier, 456 * passing these up to the higher level protocol 457 * and the raw interface. 458 */ 459 impintr() 460 { 461 register struct mbuf *m; 462 register struct control_leader *cp; 463 struct ifnet *ifp; 464 int s; 465 466 for (;;) { 467 s = splimp(); 468 IF_DEQUEUEIF(&impintrq, m, ifp); 469 splx(s); 470 if (m == 0) 471 return; 472 473 cp = mtod(m, struct control_leader *); 474 imp_leader_to_addr(&impsrc.sin_addr, cp, ifp); 475 impproto.sp_protocol = cp->dl_link; 476 impdst.sin_addr = IA_SIN(ifp->if_addrlist)->sin_addr; 477 478 if (cp->dl_mtype == IMPTYPE_HOSTDEAD || 479 cp->dl_mtype == IMPTYPE_HOSTUNREACH) 480 switch (cp->dl_link) { 481 482 case IMPLINK_IP: 483 pfctlinput((int)cp->dl_mtype, 484 (struct sockaddr *)&impsrc); 485 break; 486 default: 487 raw_ctlinput((int)cp->dl_mtype, 488 (struct sockaddr *)&impsrc); 489 break; 490 } 491 492 raw_input(m, &impproto, (struct sockaddr *)&impsrc, 493 (struct sockaddr *)&impdst); 494 } 495 } 496 497 /* 498 * ARPAnet 1822 output routine. 499 * Called from higher level protocol routines to set up messages for 500 * transmission to the imp. Sets up the header and calls impsnd to 501 * enqueue the message for this IMP's hardware driver. 502 */ 503 impoutput(ifp, m0, dst) 504 register struct ifnet *ifp; 505 struct mbuf *m0; 506 struct sockaddr *dst; 507 { 508 register struct imp_leader *imp; 509 register struct mbuf *m = m0; 510 caddr_t pkt = mtod(m, caddr_t); 511 int error = 0; 512 513 /* 514 * Don't even try if the IMP is unavailable. 515 */ 516 if (!IMPS_RUNNING(imp_softc[ifp->if_unit].imp_state)) { 517 error = ENETDOWN; 518 goto drop; 519 } 520 521 /* 522 * If AF_IMPLINK, leader exists; just send. 523 * Otherwise, construct leader according to address family. 524 */ 525 if (dst->sa_family != AF_IMPLINK) { 526 /* 527 * Add IMP leader. If there's not enough space in the 528 * first mbuf, allocate another. If that should fail, we 529 * drop this sucker. 530 */ 531 M_PREPEND(m, sizeof(struct imp_leadr), M_DONTWAIT); 532 imp = mtod(m, struct imp_leader *); 533 imp->il_format = IMP_NFF; 534 imp->il_mtype = IMPTYPE_DATA; 535 imp->il_flags = 0; 536 imp->il_htype = 0; 537 imp->il_subtype = 0; 538 539 switch (dst->sa_family) { 540 541 case AF_INET: 542 imp->il_link = IMPLINK_IP; 543 imp_addr_to_leader((struct control_leader *)imp, 544 ((struct sockaddr_in *)dst)->sin_addr.s_addr); 545 imp->il_length = htons(ntohs((u_short) 546 ((struct ip *)pkt)->ip_len) << 3); 547 break; 548 549 default: 550 printf("imp%d: can't handle af%d\n", ifp->if_unit, 551 dst->sa_family); 552 error = EAFNOSUPPORT; 553 m0 = m; 554 goto drop; 555 } 556 } 557 return (impsnd(ifp, m)); 558 drop: 559 m_freem(m0); 560 return (error); 561 } 562 563 /* 564 * Put a message on an interface's output queue. 565 * Perform RFNM counting: no more than 8 message may be 566 * in flight to any one host. 567 */ 568 impsnd(ifp, m) 569 struct ifnet *ifp; 570 struct mbuf *m; 571 { 572 register struct control_leader *imp; 573 register struct host *hp; 574 register struct imp_softc *sc = &imp_softc[ifp->if_unit]; 575 int s, error = 0; 576 577 imp = mtod(m, struct control_leader *); 578 579 /* 580 * Do RFNM counting for data messages 581 * (no more than 8 outstanding to any host). 582 * Queue data messages per host if 8 are already outstanding 583 * or if the hardware interface is already doing output. 584 * Increment imp_msgready if the message could be sent now, 585 * but must be queued because the imp output is busy. 586 */ 587 s = splimp(); 588 if (imp->dl_mtype == IMPTYPE_DATA) { 589 hp = hostenter((int)imp->dl_imp, (int)imp->dl_host, 590 ifp->if_unit); 591 if (hp) { 592 if (hp->h_flags & (HF_DEAD|HF_UNREACH)) 593 error = hp->h_flags & HF_DEAD ? 594 EHOSTDOWN : EHOSTUNREACH; 595 else if (hp->h_rfnm < IMP_MAXHOSTMSG && 596 sc->imp_cb.ic_oactive == 0) { 597 /* 598 * Send without queuing; 599 * adjust rfnm count and timer. 600 */ 601 if (hp->h_rfnm++ == 0) 602 hp->h_timer = RFNMTIMER; 603 goto send; 604 } else if (hp->h_rfnm + hp->h_qcnt < imphqlen) { 605 HOST_ENQUE(hp, m); 606 if (hp->h_rfnm + hp->h_qcnt <= IMP_MAXHOSTMSG) 607 sc->imp_msgready++; 608 } else { 609 error = ENOBUFS; 610 IF_DROP(&ifp->if_snd); 611 } 612 } else 613 error = ENOBUFS; 614 } else if (sc->imp_cb.ic_oactive == 0) 615 goto send; 616 else 617 IF_ENQUEUE(&ifp->if_snd, m); 618 619 splx(s); 620 if (error) 621 m_freem(m); 622 return (error); 623 624 send: 625 sc->imp_if.if_timer = IMP_OTIMER; 626 (*sc->imp_cb.ic_output)(sc->imp_cb.ic_hwunit, m); 627 splx(s); 628 return (0); 629 } 630 631 /* 632 * Start another output operation on IMP; called from hardware 633 * transmit-complete interrupt routine at splimp or from imp routines 634 * when output is not in progress. If there are any packets on shared 635 * output queue, send them, otherwise send the next data packet for a host. 636 * Host data packets are sent round-robin based on destination by walking 637 * the host list. 638 */ 639 impstart(sc) 640 register struct imp_softc *sc; 641 { 642 register struct mbuf *m; 643 int first = 1; /* XXX */ 644 register struct host *hp; 645 int index; 646 647 IF_DEQUEUE(&sc->imp_if.if_snd, m); 648 if (m) { 649 sc->imp_if.if_timer = IMP_OTIMER; 650 (*sc->imp_cb.ic_output)(sc->imp_cb.ic_hwunit, m); 651 return; 652 } 653 if (sc->imp_msgready) { 654 if ((m = sc->imp_hostq) == 0 && (m = sc->imp_hosts) == 0) 655 panic("imp msgready"); 656 index = sc->imp_hostent; 657 for (hp = &mtod(m, struct hmbuf *)->hm_hosts[index]; ; 658 hp++, index++) { 659 if (index >= HPMBUF) { 660 if ((m = m->m_next) == 0) 661 m = sc->imp_hosts; 662 index = 0; 663 hp = mtod(m, struct hmbuf *)->hm_hosts; 664 first = 0; /* XXX */ 665 } 666 if (hp->h_qcnt && hp->h_rfnm < IMP_MAXHOSTMSG) { 667 /* 668 * Found host entry with another message 669 * to send. Deliver it to the IMP. 670 * Start with succeeding host next time. 671 */ 672 impstarthost(sc, hp); 673 sc->imp_hostq = m; 674 sc->imp_hostent = index + 1; 675 return; 676 } 677 if (m == sc->imp_hostq && !first && 678 index + 1 >= sc->imp_hostent) { /* XXX */ 679 log(imppri, "imp: can't find %d msgready\n", 680 sc->imp_msgready); 681 sc->imp_msgready = 0; 682 break; 683 } 684 } 685 } 686 sc->imp_if.if_timer = 0; 687 } 688 689 /* 690 * Restart output for a host that has received a RFNM 691 * or incomplete or has timed out while waiting for a RFNM. 692 * Must be called at splimp. 693 */ 694 imprestarthost(sc, hp) 695 register struct imp_softc *sc; 696 struct host *hp; 697 { 698 699 if (--hp->h_rfnm > 0) 700 hp->h_timer = RFNMTIMER; 701 /* 702 * If the RFNM moved a queued message into the window, 703 * update msgready and start IMP if idle. 704 */ 705 if (hp->h_qcnt > IMP_MAXHOSTMSG - 1 - hp->h_rfnm) { 706 sc->imp_msgready++; 707 if (sc->imp_cb.ic_oactive == 0) 708 impstarthost(sc, hp); 709 } 710 if (hp->h_rfnm == 0 && hp->h_qcnt == 0) 711 hostidle(hp); 712 } 713 714 /* 715 * Send the next message queued for a host 716 * when ready to send another message to the IMP. 717 * Called only when output is not in progress. 718 * Bump RFNM counter and start RFNM timer 719 * when we send the message to the IMP. 720 * Must be called at splimp. 721 */ 722 impstarthost(sc, hp) 723 register struct imp_softc *sc; 724 register struct host *hp; 725 { 726 struct mbuf *m; 727 728 if (hp->h_rfnm++ == 0) 729 hp->h_timer = RFNMTIMER; 730 HOST_DEQUE(hp, m); 731 sc->imp_if.if_timer = IMP_OTIMER; 732 (*sc->imp_cb.ic_output)(sc->imp_cb.ic_hwunit, m); 733 sc->imp_msgready--; 734 } 735 736 /* 737 * "Watchdog" timeout. When the output timer expires, 738 * we assume we have been blocked by the imp. 739 * No need to restart, just collect statistics. 740 */ 741 imptimo(unit) 742 int unit; 743 { 744 745 imp_softc[unit].imp_block++; 746 } 747 748 /* 749 * Put three 1822 NOOPs at the head of the output queue. 750 * Part of host-IMP initialization procedure. 751 * (Should return success/failure, but noone knows 752 * what to do with this, so why bother?) 753 * This routine is always called at splimp, so we don't 754 * protect the call to IF_PREPEND. 755 */ 756 impnoops(sc) 757 register struct imp_softc *sc; 758 { 759 register i; 760 register struct mbuf *m; 761 register struct control_leader *cp; 762 763 #ifdef IMPINIT 764 if (imptraceinit) 765 log(imppri, "impnoops\n"); 766 #endif 767 for (i = 0; i < IMP_NOOPCNT; i++) { 768 if ((m = m_getclr(M_DONTWAIT, MT_HEADER)) == 0) 769 return; 770 m->m_len = sizeof(struct control_leader); 771 cp = mtod(m, struct control_leader *); 772 cp->dl_format = IMP_NFF; 773 cp->dl_link = i; 774 cp->dl_mtype = IMPTYPE_NOOP; 775 IF_PREPEND(&sc->imp_if.if_snd, m); 776 } 777 if (sc->imp_cb.ic_oactive == 0) 778 impstart(sc); 779 } 780 781 /* 782 * Process an ioctl request. 783 */ 784 impioctl(ifp, cmd, data) 785 register struct ifnet *ifp; 786 int cmd; 787 caddr_t data; 788 { 789 struct ifaddr *ifa = (struct ifaddr *) data; 790 int s = splimp(), error = 0; 791 #define sc ((struct imp_softc *)ifp) 792 793 switch (cmd) { 794 795 case SIOCSIFADDR: 796 if (ifa->ifa_addr.sa_family != AF_INET) { 797 error = EINVAL; 798 break; 799 } 800 if ((ifp->if_flags & IFF_UP) == 0) 801 impinit(ifp->if_unit); 802 break; 803 804 case SIOCSIFFLAGS: 805 if ((ifp->if_flags & IFF_UP) == 0 && 806 sc->imp_state != IMPS_DOWN) { 807 if (sc->imp_cb.ic_down && 808 (*sc->imp_cb.ic_down)(sc->imp_cb.ic_hwunit)) { 809 sc->imp_state = IMPS_DOWN; 810 sc->imp_msgready = 0; 811 hostreset(ifp->if_unit); 812 if_down(ifp); 813 } 814 } else if (ifp->if_flags & IFF_UP && sc->imp_state == IMPS_DOWN) 815 impinit(ifp->if_unit); 816 break; 817 818 default: 819 error = EINVAL; 820 break; 821 } 822 splx(s); 823 return (error); 824 } 825 826 #ifdef IMPLEADERS 827 printleader(routine, ip) 828 char *routine; 829 register struct imp_leader *ip; 830 { 831 printf("%s: ", routine); 832 printbyte((char *)ip, 12); 833 printf("<fmt=%x,net=%x,flags=%x,mtype=", ip->il_format, ip->il_network, 834 ip->il_flags); 835 if (ip->il_mtype <= IMPTYPE_READY) 836 printf("%s,", impleaders[ip->il_mtype]); 837 else 838 printf("%x,", ip->il_mtype); 839 printf("htype=%x,host=%x,imp=%x,link=", ip->il_htype, ip->il_host, 840 ntohs(ip->il_imp)); 841 if (ip->il_link == IMPLINK_IP) 842 printf("ip,"); 843 else 844 printf("%x,", ip->il_link); 845 printf("subtype=%x,len=%x>\n",ip->il_subtype,ntohs(ip->il_length)>>3); 846 } 847 848 printbyte(cp, n) 849 register char *cp; 850 int n; 851 { 852 register i, j, c; 853 854 for (i=0; i<n; i++) { 855 c = *cp++; 856 for (j=0; j<2; j++) 857 putchar("0123456789abcdef"[(c>>((1-j)*4))&0xf], 0); 858 putchar(' ', 0); 859 } 860 putchar('\n', 0); 861 } 862 #endif 863 864 /* 865 * Routine to convert from IMP Leader to InterNet Address. 866 * 867 * This procedure is necessary because IMPs may be assigned Class A, B, or C 868 * network numbers, but only have 8 bits in the leader to reflect the 869 * IMP "network number". The strategy is to take the network number from 870 * the ifnet structure, and blend in the host-on-imp and imp-on-net numbers 871 * from the leader. 872 * 873 * There is no support for "Logical Hosts". 874 * 875 * Class A: Net.Host.0.Imp 876 * Class B: Net.net.Host.Imp 877 * Class C: Net.net.net.(Host4|Imp4) 878 */ 879 imp_leader_to_addr(ap, cp, ifp) 880 struct in_addr *ap; 881 register struct control_leader *cp; 882 struct ifnet *ifp; 883 { 884 register u_long final; 885 register struct sockaddr_in *sin; 886 int imp = ntohs(cp->dl_imp); 887 888 sin = (struct sockaddr_in *)(&ifp->if_addrlist->ifa_addr); 889 final = ntohl(sin->sin_addr.s_addr); 890 891 if (IN_CLASSA(final)) { 892 final &= IN_CLASSA_NET; 893 final |= (imp & 0xFF) | ((cp->dl_host & 0xFF)<<16); 894 } else if (IN_CLASSB(final)) { 895 final &= IN_CLASSB_NET; 896 final |= (imp & 0xFF) | ((cp->dl_host & 0xFF)<<8); 897 } else { 898 final &= IN_CLASSC_NET; 899 final |= (imp & 0x0F) | ((cp->dl_host & 0x0F)<<4); 900 } 901 ap->s_addr = htonl(final); 902 } 903 904 /* 905 * Function to take InterNet address and fill in IMP leader fields. 906 */ 907 imp_addr_to_leader(imp, a) 908 register struct control_leader *imp; 909 u_long a; 910 { 911 register u_long addr = ntohl(a); 912 913 imp->dl_network = 0; /* !! */ 914 915 if (IN_CLASSA(addr)) { 916 imp->dl_host = ((addr>>16) & 0xFF); 917 imp->dl_imp = addr & 0xFF; 918 } else if (IN_CLASSB(addr)) { 919 imp->dl_host = ((addr>>8) & 0xFF); 920 imp->dl_imp = addr & 0xFF; 921 } else { 922 imp->dl_host = ((addr>>4) & 0xF); 923 imp->dl_imp = addr & 0xF; 924 } 925 imp->dl_imp = htons(imp->dl_imp); 926 } 927 #endif 928