1 /* if_imp.c 4.41 82/10/20 */ 2 3 #include "imp.h" 4 #if NIMP > 0 5 /* 6 * ARPANET IMP interface driver. 7 * 8 * The IMP-host protocol is handled here, leaving 9 * hardware specifics to the lower level interface driver. 10 */ 11 #include "../h/param.h" 12 #include "../h/systm.h" 13 #include "../h/mbuf.h" 14 #include "../h/pte.h" 15 #include "../h/buf.h" 16 #include "../h/protosw.h" 17 #include "../h/socket.h" 18 #include "../h/vmmac.h" 19 20 #include "../vax/cpu.h" 21 #include "../vax/mtpr.h" 22 #include "../vax/ubareg.h" 23 #include "../vax/ubavar.h" 24 25 #include "../net/if.h" 26 #include "../net/route.h" 27 #include "../net/netisr.h" 28 #include "../netinet/in.h" 29 #include "../netinet/in_systm.h" 30 #include "../netinet/ip.h" 31 #include "../netinet/ip_var.h" 32 /* define IMPLEADERS here to get leader printing code */ 33 #include "../netimp/if_imp.h" 34 #include "../netimp/if_imphost.h" 35 #include <errno.h> 36 37 /* 38 * IMP software status per interface. 39 * (partially shared with the hardware specific module) 40 * 41 * Each interface is referenced by a network interface structure, 42 * imp_if, which the routing code uses to locate the interface. 43 * This structure contains the output queue for the interface, its 44 * address, ... IMP specific structures used in connecting the 45 * IMP software modules to the hardware specific interface routines 46 * are stored here. The common structures are made visible to the 47 * interface driver by passing a pointer to the hardware routine 48 * at "attach" time. 49 * 50 * NOTE: imp_if and imp_cb are assumed adjacent in hardware code. 51 */ 52 struct imp_softc { 53 struct ifnet imp_if; /* network visible interface */ 54 struct impcb imp_cb; /* hooks to hardware module */ 55 u_char imp_state; /* current state of IMP */ 56 char imp_dropcnt; /* used during initialization */ 57 } imp_softc[NIMP]; 58 59 /* 60 * Messages from IMP regarding why 61 * it's going down. 62 */ 63 static char *impmessage[] = { 64 "in 30 seconds", 65 "for hardware PM", 66 "to reload software", 67 "for emergency reset" 68 }; 69 70 int impdown(), impinit(), impoutput(); 71 72 /* 73 * IMP attach routine. Called from hardware device attach routine 74 * at configuration time with a pointer to the UNIBUS device structure. 75 * Sets up local state and returns pointer to base of ifnet+impcb 76 * structures. This is then used by the device's attach routine 77 * set up its back pointers. 78 */ 79 impattach(ui) 80 struct uba_device *ui; 81 { 82 struct imp_softc *sc = &imp_softc[ui->ui_unit]; 83 register struct ifnet *ifp = &sc->imp_if; 84 struct sockaddr_in *sin; 85 86 /* UNIT COULD BE AMBIGUOUS */ 87 ifp->if_unit = ui->ui_unit; 88 ifp->if_name = "imp"; 89 ifp->if_mtu = IMPMTU - sizeof(struct imp_leader); 90 ifp->if_net = ui->ui_flags; 91 /* the host and imp fields will be filled in by the imp */ 92 sin = (struct sockaddr_in *)&ifp->if_addr; 93 sin->sin_family = AF_INET; 94 sin->sin_addr = if_makeaddr(ifp->if_net, 0); 95 ifp->if_init = impinit; 96 ifp->if_output = impoutput; 97 /* reset is handled at the hardware level */ 98 if_attach(ifp); 99 return ((int)&sc->imp_if); 100 } 101 102 /* 103 * IMP initialization routine: call hardware module to 104 * setup UNIBUS resources, init state and get ready for 105 * NOOPs the IMP should send us, and that we want to drop. 106 */ 107 impinit(unit) 108 int unit; 109 { 110 int s = splimp(); 111 register struct imp_softc *sc = &imp_softc[unit]; 112 113 if ((*sc->imp_cb.ic_init)(unit) == 0) { 114 sc->imp_state = IMPS_DOWN; 115 sc->imp_if.if_flags &= ~IFF_UP; 116 splx(s); 117 return; 118 } 119 sc->imp_state = IMPS_INIT; 120 impnoops(sc); 121 splx(s); 122 } 123 124 struct sockproto impproto = { PF_IMPLINK }; 125 struct sockaddr_in impdst = { AF_IMPLINK }; 126 struct sockaddr_in impsrc = { AF_IMPLINK }; 127 #ifdef IMPLEADERS 128 int impprintfs = 0; 129 #endif 130 131 /* 132 * ARPAnet 1822 input routine. 133 * Called from hardware input interrupt routine to handle 1822 134 * IMP-host messages. Type 0 messages (non-control) are 135 * passed to higher level protocol processors on the basis 136 * of link number. Other type messages (control) are handled here. 137 */ 138 impinput(unit, m) 139 int unit; 140 register struct mbuf *m; 141 { 142 register struct imp_leader *ip; 143 register struct imp_softc *sc = &imp_softc[unit]; 144 register struct host *hp; 145 register struct ifqueue *inq; 146 struct control_leader *cp; 147 struct in_addr addr; 148 struct mbuf *next; 149 struct sockaddr_in *sin; 150 151 /* verify leader length. */ 152 if (m->m_len < sizeof(struct control_leader) && 153 (m = m_pullup(m, sizeof(struct control_leader))) == 0) 154 return; 155 cp = mtod(m, struct control_leader *); 156 if (cp->dl_mtype == IMPTYPE_DATA) 157 if (m->m_len < sizeof(struct imp_leader) && 158 (m = m_pullup(m, sizeof(struct imp_leader))) == 0) 159 return; 160 ip = mtod(m, struct imp_leader *); 161 #ifdef IMPLEADERS 162 if (impprintfs) 163 printleader("impinput", ip); 164 #endif 165 166 /* check leader type */ 167 if (ip->il_format != IMP_NFF) { 168 sc->imp_if.if_collisions++; /* XXX */ 169 goto drop; 170 } 171 172 if (ip->il_mtype != IMPTYPE_DATA) { 173 #ifdef notdef 174 addr.s_net = ip->il_network; 175 #else 176 addr.s_net = sc->imp_if.if_net; 177 #endif 178 addr.s_imp = ip->il_imp; 179 addr.s_host = ip->il_host; 180 } 181 switch (ip->il_mtype) { 182 183 case IMPTYPE_DATA: 184 break; 185 186 /* 187 * IMP leader error. Reset the IMP and discard the packet. 188 */ 189 case IMPTYPE_BADLEADER: 190 /* 191 * According to 1822 document, this message 192 * will be generated in response to the 193 * first noop sent to the IMP after 194 * the host resets the IMP interface. 195 */ 196 if (sc->imp_state != IMPS_INIT) { 197 impmsg(sc, "leader error"); 198 hostreset(sc->imp_if.if_net); 199 impnoops(sc); 200 } 201 goto drop; 202 203 /* 204 * IMP going down. Print message, and if not immediate, 205 * set off a timer to insure things will be reset at the 206 * appropriate time. 207 */ 208 case IMPTYPE_DOWN: 209 if (sc->imp_state < IMPS_INIT) 210 goto drop; 211 if ((ip->il_link & IMP_DMASK) == 0) { 212 sc->imp_state = IMPS_GOINGDOWN; 213 timeout(impdown, (caddr_t)sc, 30 * hz); 214 } 215 impmsg(sc, "going down %s", 216 (u_int)impmessage[ip->il_link&IMP_DMASK]); 217 goto drop; 218 219 /* 220 * A NOP usually seen during the initialization sequence. 221 * Compare the local address with that in the message. 222 * Reset the local address notion if it doesn't match. 223 */ 224 case IMPTYPE_NOOP: 225 if (sc->imp_state == IMPS_DOWN) { 226 sc->imp_state = IMPS_INIT; 227 sc->imp_dropcnt = IMP_DROPCNT; 228 } 229 if (sc->imp_state == IMPS_INIT && --sc->imp_dropcnt > 0) 230 goto drop; 231 sin = (struct sockaddr_in *)&sc->imp_if.if_addr; 232 if (sin->sin_addr.s_host != ip->il_host || 233 sin->sin_addr.s_imp != ip->il_imp) { 234 sc->imp_if.if_host[0] = 235 sin->sin_addr.s_host = ip->il_host; 236 sin->sin_addr.s_imp = ip->il_imp; 237 impmsg(sc, "reset (host %d/imp %d)", (u_int)ip->il_host, 238 ntohs(ip->il_imp)); 239 } 240 sc->imp_state = IMPS_UP; 241 sc->imp_if.if_flags |= IFF_UP; 242 if_rtinit(&sc->imp_if, RTF_UP); 243 goto drop; 244 245 /* 246 * RFNM or INCOMPLETE message, send next 247 * message on the q. We could pass incomplete's 248 * up to the next level, but this currently isn't 249 * needed. 250 */ 251 case IMPTYPE_RFNM: 252 case IMPTYPE_INCOMPLETE: 253 if (hp = hostlookup(addr)) { 254 if (hp->h_rfnm == 0) 255 hp->h_flags &= ~HF_INUSE; 256 else if (next = hostdeque(hp)) 257 (void) impsnd(&sc->imp_if, next); 258 } 259 goto drop; 260 261 /* 262 * Host or IMP can't be reached. Flush any packets 263 * awaiting transmission and release the host structure. 264 */ 265 case IMPTYPE_HOSTDEAD: 266 case IMPTYPE_HOSTUNREACH: { 267 int s = splnet(); 268 impnotify((int)ip->il_mtype, (struct control_leader *)ip, 269 hostlookup(addr)); 270 splx(s); 271 goto rawlinkin; 272 } 273 274 /* 275 * Error in data. Clear RFNM status for this host and send 276 * noops to the IMP to clear the interface. 277 */ 278 case IMPTYPE_BADDATA: { 279 int s; 280 281 impmsg(sc, "data error"); 282 s = splnet(); 283 if (hp = hostlookup(addr)) 284 hp->h_rfnm = 0; 285 splx(s); 286 impnoops(sc); 287 goto drop; 288 } 289 290 /* 291 * Interface reset. 292 */ 293 case IMPTYPE_RESET: 294 impmsg(sc, "interface reset"); 295 impnoops(sc); 296 goto drop; 297 298 default: 299 sc->imp_if.if_collisions++; /* XXX */ 300 goto drop; 301 } 302 303 /* 304 * Data for a protocol. Dispatch to the appropriate 305 * protocol routine (running at software interrupt). 306 * If this isn't a raw interface, advance pointer 307 * into mbuf past leader. 308 */ 309 switch (ip->il_link) { 310 311 #ifdef INET 312 case IMPLINK_IP: 313 m->m_len -= sizeof(struct imp_leader); 314 m->m_off += sizeof(struct imp_leader); 315 schednetisr(NETISR_IP); 316 inq = &ipintrq; 317 break; 318 #endif 319 320 default: 321 rawlinkin: 322 impproto.sp_protocol = ip->il_link; 323 sin = (struct sockaddr_in *)&sc->imp_if.if_addr; 324 impdst.sin_addr = sin->sin_addr;; 325 impsrc.sin_addr.s_net = ip->il_network; 326 impsrc.sin_addr.s_host = ip->il_host; 327 impsrc.sin_addr.s_imp = ip->il_imp; 328 raw_input(m, &impproto, (struct sockaddr *)&impsrc, 329 (struct sockaddr *)&impdst); 330 return; 331 } 332 if (IF_QFULL(inq)) { 333 IF_DROP(inq); 334 goto drop; 335 } 336 IF_ENQUEUE(inq, m); 337 return; 338 339 drop: 340 m_freem(m); 341 } 342 343 /* 344 * Bring the IMP down after notification. 345 */ 346 impdown(sc) 347 struct imp_softc *sc; 348 { 349 350 sc->imp_state = IMPS_DOWN; 351 impmsg(sc, "marked down"); 352 hostreset(sc->imp_if.if_net); 353 if_down(&sc->imp_if); 354 } 355 356 /*VARARGS*/ 357 impmsg(sc, fmt, a1, a2) 358 struct imp_softc *sc; 359 char *fmt; 360 u_int a1; 361 { 362 363 printf("imp%d: ", sc->imp_if.if_unit); 364 printf(fmt, a1, a2); 365 printf("\n"); 366 } 367 368 /* 369 * Process an IMP "error" message, passing this 370 * up to the higher level protocol. 371 */ 372 impnotify(what, cp, hp) 373 int what; 374 struct control_leader *cp; 375 struct host *hp; 376 { 377 struct in_addr in; 378 379 #ifdef notdef 380 in.s_net = cp->dl_network; 381 #else 382 in.s_net = 10; /* XXX */ 383 #endif 384 in.s_host = cp->dl_host; 385 in.s_imp = cp->dl_imp; 386 if (cp->dl_link != IMPLINK_IP) 387 raw_ctlinput(what, (caddr_t)&in); 388 else 389 ip_ctlinput(what, (caddr_t)&in); 390 if (hp) { 391 hp->h_flags |= (1 << what); 392 hostfree(hp); 393 } 394 } 395 396 /* 397 * ARPAnet 1822 output routine. 398 * Called from higher level protocol routines to set up messages for 399 * transmission to the imp. Sets up the header and calls impsnd to 400 * enqueue the message for this IMP's hardware driver. 401 */ 402 impoutput(ifp, m0, dst) 403 register struct ifnet *ifp; 404 struct mbuf *m0; 405 struct sockaddr *dst; 406 { 407 register struct imp_leader *imp; 408 register struct mbuf *m = m0; 409 int x, dhost, dimp, dlink, len, dnet; 410 int error = 0; 411 412 /* 413 * Don't even try if the IMP is unavailable. 414 */ 415 if (imp_softc[ifp->if_unit].imp_state != IMPS_UP) { 416 error = ENETDOWN; 417 goto drop; 418 } 419 420 switch (dst->sa_family) { 421 422 #ifdef INET 423 case AF_INET: { 424 struct ip *ip = mtod(m0, struct ip *); 425 struct sockaddr_in *sin = (struct sockaddr_in *)dst; 426 427 dhost = sin->sin_addr.s_host; 428 dimp = sin->sin_addr.s_impno; 429 dlink = IMPLINK_IP; 430 dnet = 0; 431 len = ntohs((u_short)ip->ip_len); 432 break; 433 } 434 #endif 435 case AF_IMPLINK: 436 goto leaderexists; 437 438 default: 439 printf("imp%d: can't handle af%d\n", ifp->if_unit, 440 dst->sa_family); 441 error = EAFNOSUPPORT; 442 goto drop; 443 } 444 445 /* 446 * Add IMP leader. If there's not enough space in the 447 * first mbuf, allocate another. If that should fail, we 448 * drop this sucker. 449 */ 450 if (m->m_off > MMAXOFF || 451 MMINOFF + sizeof(struct imp_leader) > m->m_off) { 452 m = m_get(M_DONTWAIT); 453 if (m == 0) { 454 error = ENOBUFS; 455 goto drop; 456 } 457 m->m_next = m0; 458 m->m_len = sizeof(struct imp_leader); 459 } else { 460 m->m_off -= sizeof(struct imp_leader); 461 m->m_len += sizeof(struct imp_leader); 462 } 463 imp = mtod(m, struct imp_leader *); 464 imp->il_format = IMP_NFF; 465 imp->il_mtype = IMPTYPE_DATA; 466 imp->il_network = dnet; 467 imp->il_host = dhost; 468 imp->il_imp = htons((u_short)dimp); 469 imp->il_length = 470 htons((u_short)(len + sizeof(struct imp_leader)) << 3); 471 imp->il_link = dlink; 472 imp->il_flags = imp->il_htype = imp->il_subtype = 0; 473 474 leaderexists: 475 return (impsnd(ifp, m)); 476 drop: 477 m_freem(m0); 478 return (error); 479 } 480 481 /* 482 * Put a message on an interface's output queue. 483 * Perform RFNM counting: no more than 8 message may be 484 * in flight to any one host. 485 */ 486 impsnd(ifp, m) 487 struct ifnet *ifp; 488 struct mbuf *m; 489 { 490 register struct imp_leader *ip; 491 register struct host *hp; 492 struct impcb *icp; 493 int s, error; 494 495 ip = mtod(m, struct imp_leader *); 496 497 /* 498 * Do RFNM counting for data messages 499 * (no more than 8 outstanding to any host) 500 */ 501 s = splimp(); 502 if (ip->il_mtype == IMPTYPE_DATA) { 503 struct in_addr addr; 504 505 #ifdef notdef 506 addr.s_net = ip->il_network; 507 #else 508 addr.s_net = ifp->if_net; /* XXX */ 509 #endif 510 addr.s_host = ip->il_host; 511 addr.s_imp = ip->il_imp; 512 if ((hp = hostlookup(addr)) == 0) 513 hp = hostenter(addr); 514 if (hp && (hp->h_flags & (HF_DEAD|HF_UNREACH))) { 515 error = hp->h_flags&HF_DEAD ? EHOSTDOWN : EHOSTUNREACH; 516 hp->h_timer = HOSTTIMER; 517 hp->h_flags &= ~HF_INUSE; 518 goto bad; 519 } 520 521 /* 522 * If IMP would block, queue until RFNM 523 */ 524 if (hp) { 525 if (hp->h_rfnm < 8) { 526 hp->h_rfnm++; 527 goto enque; 528 } 529 if (hp->h_qcnt < 8) { /* high water mark */ 530 HOST_ENQUE(hp, m); 531 goto start; 532 } 533 } 534 error = ENOBUFS; 535 goto bad; 536 } 537 enque: 538 if (IF_QFULL(&ifp->if_snd)) { 539 IF_DROP(&ifp->if_snd); 540 error = ENOBUFS; 541 bad: 542 m_freem(m); 543 splx(s); 544 return (error); 545 } 546 IF_ENQUEUE(&ifp->if_snd, m); 547 start: 548 icp = &imp_softc[ifp->if_unit].imp_cb; 549 if (icp->ic_oactive == 0) 550 (*icp->ic_start)(ifp->if_unit); 551 splx(s); 552 return (0); 553 } 554 555 /* 556 * Put three 1822 NOOPs at the head of the output queue. 557 * Part of host-IMP initialization procedure. 558 * (Should return success/failure, but noone knows 559 * what to do with this, so why bother?) 560 * This routine is always called at splimp, so we don't 561 * protect the call to IF_PREPEND. 562 */ 563 impnoops(sc) 564 register struct imp_softc *sc; 565 { 566 register i; 567 register struct mbuf *m; 568 register struct control_leader *cp; 569 int x; 570 571 sc->imp_dropcnt = IMP_DROPCNT; 572 for (i = 0; i < IMP_DROPCNT + 1; i++ ) { 573 if ((m = m_getclr(M_DONTWAIT)) == 0) 574 return; 575 m->m_len = sizeof(struct control_leader); 576 cp = mtod(m, struct control_leader *); 577 cp->dl_format = IMP_NFF; 578 cp->dl_link = i; 579 cp->dl_mtype = IMPTYPE_NOOP; 580 IF_PREPEND(&sc->imp_if.if_snd, m); 581 } 582 if (sc->imp_cb.ic_oactive == 0) 583 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 584 } 585 586 #ifdef IMPLEADERS 587 printleader(routine, ip) 588 char *routine; 589 register struct imp_leader *ip; 590 { 591 printf("%s: ", routine); 592 printbyte((char *)ip, 12); 593 printf("<fmt=%x,net=%x,flags=%x,mtype=", ip->il_format, ip->il_network, 594 ip->il_flags); 595 if (ip->il_mtype <= IMPTYPE_READY) 596 printf("%s,", impleaders[ip->il_mtype]); 597 else 598 printf("%x,", ip->il_mtype); 599 printf("htype=%x,host=%x,imp=%x,link=", ip->il_htype, ip->il_host, 600 ntohs(ip->il_imp)); 601 if (ip->il_link == IMPLINK_IP) 602 printf("ip,"); 603 else 604 printf("%x,", ip->il_link); 605 printf("subtype=%x,len=%x>\n",ip->il_subtype,ntohs(ip->il_length)>>3); 606 } 607 608 printbyte(cp, n) 609 register char *cp; 610 int n; 611 { 612 register i, j, c; 613 614 for (i=0; i<n; i++) { 615 c = *cp++; 616 for (j=0; j<2; j++) 617 putchar("0123456789abcdef"[(c>>((1-j)*4))&0xf]); 618 putchar(' '); 619 } 620 putchar('\n'); 621 } 622 #endif 623 #endif 624