1 /* if_imp.c 4.12 82/03/10 */ 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 * TODO: 12 * rethink coupling between this module and device driver 13 * pass more error indications up to protocol modules 14 */ 15 #include "../h/param.h" 16 #include "../h/systm.h" 17 #include "../h/mbuf.h" 18 #include "../h/pte.h" 19 #include "../h/buf.h" 20 #include "../h/protosw.h" 21 #include "../h/socket.h" 22 #include "../h/ubareg.h" 23 #include "../h/ubavar.h" 24 #include "../h/cpu.h" 25 #include "../h/mtpr.h" 26 #include "../h/vmmac.h" 27 #include "../net/in.h" 28 #include "../net/in_systm.h" 29 #include "../net/if.h" 30 #include "../net/if_imp.h" 31 #include "../net/if_imphost.h" 32 #include "../net/ip.h" 33 #include "../net/ip_var.h" 34 35 /* 36 * IMP software status per interface. 37 * (partially shared with the hardware specific module) 38 * 39 * Each interface is referenced by a network interface structure, 40 * imp_if, which the routing code uses to locate the interface. 41 * This structure contains the output queue for the interface, its 42 * address, ... IMP specific structures used in connecting the 43 * IMP software modules to the hardware specific interface routines 44 * are stored here. The common structures are made visible to the 45 * interface driver by passing a pointer to the hardware routine 46 * at "attach" time. 47 * 48 * NOTE: imp_if and imp_cb are assumed adjacent in hardware code. 49 */ 50 struct imp_softc { 51 struct ifnet imp_if; /* network visible interface */ 52 struct impcb imp_cb; /* hooks to hardware module */ 53 u_char imp_state; /* current state of IMP */ 54 char imp_dropcnt; /* used during initialization */ 55 } imp_softc[NIMP]; 56 57 /* 58 * Messages from IMP regarding why 59 * it's going down. 60 */ 61 static char *impmessage[] = { 62 "in 30 seconds", 63 "for hardware PM", 64 "to reload software", 65 "for emergency reset" 66 }; 67 68 int impdown(), impinit(), impoutput(); 69 70 /* 71 * IMP attach routine. Called from hardware device attach routine 72 * at configuration time with a pointer to the UNIBUS device structure. 73 * Sets up local state and returns pointer to base of ifnet+impcb 74 * structures. This is then used by the device's attach routine 75 * set up its back pointers. 76 */ 77 impattach(ui) 78 struct uba_device *ui; 79 { 80 struct imp_softc *sc = &imp_softc[ui->ui_unit]; 81 register struct ifnet *ifp = &sc->imp_if; 82 83 COUNT(IMPATTACH); 84 /* UNIT COULD BE AMBIGUOUS */ 85 ifp->if_unit = ui->ui_unit; 86 ifp->if_name = "imp"; 87 ifp->if_mtu = IMP_MTU; 88 ifp->if_net = ui->ui_flags; 89 /* the host and imp fields will be filled in by the imp */ 90 ifp->if_addr = if_makeaddr(ifp->if_net, 0); 91 ifp->if_init = impinit; 92 ifp->if_output = impoutput; 93 /* reset is handled at the hardware level */ 94 if_attach(ifp); 95 /* kludge to hand pointers back to hardware attach routine */ 96 return ((int)&sc->imp_if); 97 } 98 99 /* 100 * IMP initialization routine: call hardware module to 101 * setup UNIBUS resources, init state and get ready for 102 * NOOPs the IMP should send us, and that we want to drop. 103 */ 104 impinit(unit) 105 int unit; 106 { 107 register struct imp_softc *sc = &imp_softc[unit]; 108 109 if ((*sc->imp_cb.ic_init)(unit) == 0) { 110 sc->imp_state = IMPS_DOWN; 111 return; 112 } 113 sc->imp_state = IMPS_INIT; 114 sc->imp_dropcnt = IMP_DROPCNT; 115 impnoops(sc); 116 } 117 118 struct sockproto impproto = { PF_IMPLINK }; 119 struct sockaddr_in impdst = { AF_IMPLINK }; 120 struct sockaddr_in impsrc = { AF_IMPLINK }; 121 122 /* 123 * ARPAnet 1822 input routine. 124 * Called from hardware input interrupt routine to handle 1822 125 * IMP-host messages. Type 0 messages (non-control) are 126 * passed to higher level protocol processors on the basis 127 * of link number. Other type messages (control) are handled here. 128 */ 129 impinput(unit, m) 130 int unit; 131 register struct mbuf *m; 132 { 133 int s; 134 register struct imp_leader *ip; 135 register struct imp_softc *sc = &imp_softc[unit]; 136 register struct host *hp; 137 register struct ifqueue *inq; 138 struct control_leader *cp; 139 struct in_addr addr; 140 struct mbuf *next; 141 142 COUNT(IMPINPUT); 143 /* 144 * Verify leader length. Be careful with control 145 * message which don't get a length included. 146 * We should generate a "bad leader" message 147 * to the IMP about messages too short. 148 */ 149 if (m->m_len < sizeof(struct control_leader) && 150 (m = m_pullup(m, sizeof(struct control_leader))) == 0) 151 return; 152 cp = mtod(m, struct control_leader *); 153 if (cp->dl_mtype == IMPTYPE_DATA) 154 if (m->m_len < sizeof(struct imp_leader) && 155 (m = m_pullup(m, sizeof(struct imp_leader))) == 0) 156 return; 157 ip = mtod(m, struct imp_leader *); 158 159 /* 160 * Check leader type -- should notify IMP 161 * in case of failure... 162 */ 163 if (ip->il_format != IMP_NFF) { 164 sc->imp_if.if_collisions++; /* XXX */ 165 goto drop; 166 } 167 168 /* 169 * Certain messages require a host structure. 170 * Do this in one shot here. 171 */ 172 switch (ip->il_mtype) { 173 174 case IMPTYPE_RFNM: 175 case IMPTYPE_INCOMPLETE: 176 case IMPTYPE_HOSTDEAD: 177 case IMPTYPE_HOSTUNREACH: 178 case IMPTYPE_BADDATA: 179 #ifdef notdef 180 addr.s_net = ip->il_network; 181 #else 182 addr.s_net = 0; 183 #endif 184 addr.s_imp = ip->il_imp; 185 addr.s_host = ip->il_host; 186 hp = hostlookup(addr); 187 break; 188 } 189 190 switch (ip->il_mtype) { 191 192 /* 193 * Data for a protocol. Dispatch to the appropriate 194 * protocol routine (running at software interrupt). 195 * If this isn't a raw interface, advance pointer 196 * into mbuf past leader (done below). 197 */ 198 case IMPTYPE_DATA: 199 ip->il_length = 200 (ntohs(ip->il_length) >> 3) - sizeof(struct imp_leader); 201 break; 202 203 /* 204 * IMP leader error. Reset the IMP and discard the packet. 205 */ 206 case IMPTYPE_BADLEADER: 207 /* 208 * According to 1822 document, this message 209 * will be generated in response to the 210 * first noop sent to the IMP after 211 * the host resets the IMP interface. 212 */ 213 if (sc->imp_state != IMPS_INIT) { 214 impmsg(sc, "leader error"); 215 hostreset(sc->imp_if.if_net); /* XXX */ 216 impnoops(sc); 217 } 218 goto rawlinkin; 219 220 /* 221 * IMP going down. Print message, and if not immediate, 222 * set off a timer to insure things will be reset at the 223 * appropriate time. 224 */ 225 case IMPTYPE_DOWN: 226 if ((ip->il_link & IMP_DMASK) == 0) { 227 sc->imp_state = IMPS_GOINGDOWN; 228 timeout(impdown, sc, 30 * hz); 229 } 230 impmsg(sc, "going down %s", impmessage[ip->il_link&IMP_DMASK]); 231 goto rawlinkin; 232 233 /* 234 * A NOP usually seen during the initialization sequence. 235 * Compare the local address with that in the message. 236 * Reset the local address notion if it doesn't match. 237 */ 238 case IMPTYPE_NOOP: { 239 register struct in_addr *sin; 240 241 if (sc->imp_state == IMPS_DOWN) { 242 sc->imp_state = IMPS_INIT; 243 sc->imp_dropcnt = IMP_DROPCNT; 244 } 245 if (sc->imp_state != IMPS_INIT || --sc->imp_dropcnt > 0) 246 goto rawlinkin; 247 sc->imp_state = IMPS_UP; 248 sin = &sc->imp_if.if_addr; 249 sc->imp_if.if_host[0] = sin->s_host = ip->il_host; 250 sin->s_imp = ip->il_imp; 251 impmsg(sc, "reset (host %d/imp %d)", ip->il_host, 252 ntohs(ip->il_imp)); 253 /* restart output in case something was q'd */ 254 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 255 goto rawlinkin; 256 } 257 258 /* 259 * RFNM or INCOMPLETE message, record in 260 * host table and prime output routine. 261 * 262 * SHOULD NOTIFY PROTOCOL ABOUT INCOMPLETES. 263 */ 264 case IMPTYPE_RFNM: 265 case IMPTYPE_INCOMPLETE: 266 if (hp && hp->h_rfnm) 267 if (next = hostdeque(hp)) 268 (void) impsnd(sc, next); 269 goto rawlinkin; 270 271 /* 272 * Host or IMP can't be reached. Flush any packets 273 * awaiting transmission and release the host structure. 274 * 275 * TODO: NOTIFY THE PROTOCOL 276 */ 277 case IMPTYPE_HOSTDEAD: 278 impmsg(sc, "host dead"); /* XXX */ 279 goto common; /* XXX */ 280 281 /* SHOULD SIGNAL ROUTING DAEMON */ 282 case IMPTYPE_HOSTUNREACH: 283 impmsg(sc, "host unreachable"); /* XXX */ 284 common: 285 if (hp) 286 hostfree(hp); /* won't work right */ 287 goto rawlinkin; 288 289 /* 290 * Error in data. Clear RFNM status for this host and send 291 * noops to the IMP to clear the interface. 292 */ 293 case IMPTYPE_BADDATA: 294 impmsg(sc, "data error"); 295 if (hp) 296 hp->h_rfnm = 0; 297 impnoops(sc); 298 goto rawlinkin; 299 300 /* 301 * Interface reset. 302 */ 303 case IMPTYPE_RESET: 304 impmsg(sc, "interface reset"); 305 impnoops(sc); 306 goto rawlinkin; 307 308 default: 309 sc->imp_if.if_collisions++; /* XXX */ 310 goto rawlinkin; 311 } 312 313 /* 314 * Queue on protocol's input queue. 315 */ 316 switch (ip->il_link) { 317 318 #ifdef INET 319 case IMPLINK_IP: 320 m->m_len -= sizeof(struct imp_leader); 321 m->m_off += sizeof(struct imp_leader); 322 setipintr(); 323 inq = &ipintrq; 324 break; 325 #endif 326 327 default: 328 rawlinkin: 329 impproto.sp_protocol = ip->il_link; 330 impdst.sin_addr = sc->imp_if.if_addr; 331 impsrc.sin_addr.s_net = ip->il_network; 332 impsrc.sin_addr.s_host = ip->il_host; 333 impsrc.sin_addr.s_imp = ip->il_imp; 334 raw_input(m, &impproto, &impdst, &impsrc); 335 return; 336 } 337 IF_ENQUEUE(inq, m); 338 return; 339 340 drop: 341 m_freem(m); 342 } 343 344 /* 345 * Bring the IMP down after notification. 346 */ 347 impdown(sc) 348 struct imp_softc *sc; 349 { 350 sc->imp_state = IMPS_DOWN; 351 impmsg(sc, "marked down"); 352 /* notify protocols with messages waiting? */ 353 } 354 355 /*VARARGS*/ 356 impmsg(sc, fmt, a1, a2) 357 struct imp_softc *sc; 358 char *fmt; 359 { 360 printf("imp%d: ", sc->imp_if.if_unit); 361 printf(fmt, a1, a2); 362 printf("\n"); 363 } 364 365 /* 366 * ARPAnet 1822 output routine. 367 * Called from higher level protocol routines to set up messages for 368 * transmission to the imp. Sets up the header and calls impsnd to 369 * enqueue the message for this IMP's hardware driver. 370 */ 371 impoutput(ifp, m0, pf) 372 register struct ifnet *ifp; 373 struct mbuf *m0; 374 { 375 register struct imp_leader *imp; 376 register struct mbuf *m = m0; 377 int x, dhost, dimp, dlink, len, dnet; 378 379 COUNT(IMPOUTPUT); 380 /* 381 * Don't even try if the IMP is unavailable. 382 */ 383 x = imp_softc[ifp->if_unit].imp_state; 384 if (x == IMPS_DOWN || x == IMPS_GOINGDOWN) 385 goto drop; 386 387 switch (pf) { 388 389 #ifdef INET 390 case PF_INET: { 391 register struct ip *ip = mtod(m0, struct ip *); 392 393 dnet = ip->ip_dst.s_net; 394 dhost = ip->ip_dst.s_host; 395 dimp = ip->ip_dst.s_imp; 396 dlink = IMPLINK_IP; 397 len = ntohs(ip->ip_len); 398 break; 399 } 400 #endif 401 case PF_IMPLINK: 402 goto leaderexists; 403 404 default: 405 printf("imp%d: can't encapsulate pf%d\n", ifp->if_unit, pf); 406 goto drop; 407 } 408 409 /* 410 * Add IMP leader. If there's not enough space in the 411 * first mbuf, allocate another. If that should fail, we 412 * drop this sucker. 413 */ 414 if (m->m_off > MMAXOFF || 415 MMINOFF + sizeof(struct imp_leader) > m->m_off) { 416 m = m_get(M_DONTWAIT); 417 if (m == 0) 418 goto drop; 419 m->m_next = m0; 420 m->m_off = MMINOFF; 421 m->m_len = sizeof(struct imp_leader); 422 } else { 423 m->m_off -= sizeof(struct imp_leader); 424 m->m_len += sizeof(struct imp_leader); 425 } 426 imp = mtod(m, struct imp_leader *); 427 imp->il_format = IMP_NFF; 428 imp->il_mtype = IMPTYPE_DATA; 429 #ifdef notdef 430 imp->il_network = dnet; 431 #else 432 imp->il_network = 0; 433 #endif 434 imp->il_host = dhost; 435 imp->il_imp = dimp; 436 imp->il_length = htons((len + sizeof(struct imp_leader)) << 3); 437 imp->il_link = dlink; 438 imp->il_flags = imp->il_htype = imp->il_subtype = 0; 439 440 leaderexists: 441 /* 442 * Hand message to impsnd to perform RFNM counting 443 * and eventual transmission. 444 */ 445 return (impsnd(ifp, m)); 446 drop: 447 m_freem(m0); 448 return (0); 449 } 450 451 /* 452 * Put a message on an interface's output queue. 453 * Perform RFNM counting: no more than 8 message may be 454 * in flight to any one host. 455 */ 456 impsnd(ifp, m) 457 struct ifnet *ifp; 458 struct mbuf *m; 459 { 460 register struct imp_leader *ip; 461 register struct host *hp; 462 struct impcb *icp; 463 int x; 464 465 COUNT(IMPSND); 466 ip = mtod(m, struct imp_leader *); 467 468 /* 469 * Do RFNM counting for data messages 470 * (no more than 8 outstanding to any host) 471 */ 472 x = splimp(); 473 if (ip->il_mtype == IMPTYPE_DATA) { 474 struct in_addr addr; 475 476 #ifdef notdef 477 addr.s_net = ip->il_network; 478 #else 479 addr.s_net = 0; 480 #endif 481 addr.s_host = ip->il_host; 482 addr.s_imp = ip->il_imp; 483 if ((hp = hostlookup(addr)) == 0) 484 hp = hostenter(addr); 485 486 /* 487 * If IMP would block, queue until RFNM 488 */ 489 if (hp) { 490 if (hp->h_rfnm < 8) { 491 hp->h_rfnm++; 492 goto enque; 493 } 494 if (hp->h_qcnt < 8) { /* high water mark */ 495 HOST_ENQUE(hp, m); 496 goto start; 497 } 498 } 499 drop: 500 m_freem(m); 501 splx(x); 502 return (0); 503 } 504 enque: 505 IF_ENQUEUE(&ifp->if_snd, m); 506 start: 507 splx(x); 508 icp = &imp_softc[ifp->if_unit].imp_cb; 509 if (icp->ic_oactive == 0) 510 (*icp->ic_start)(ifp->if_unit); 511 return (1); 512 } 513 514 /* 515 * Put three 1822 NOOPs at the head of the output queue. 516 * Part of host-IMP initialization procedure. 517 * (Should return success/failure, but noone knows 518 * what to do with this, so why bother?) 519 */ 520 impnoops(sc) 521 register struct imp_softc *sc; 522 { 523 register i; 524 register struct mbuf *m; 525 register struct control_leader *cp; 526 int x; 527 528 COUNT(IMPNOOPS); 529 sc->imp_state = IMPS_INIT; 530 sc->imp_dropcnt = IMP_DROPCNT; 531 for (i = 0; i < IMP_DROPCNT + 1; i++ ) { 532 if ((m = m_getclr(M_DONTWAIT)) == 0) 533 return; 534 m->m_off = MMINOFF; 535 m->m_len = sizeof(struct control_leader); 536 cp = mtod(m, struct control_leader *); 537 cp->dl_format = IMP_NFF; 538 cp->dl_link = i; 539 cp->dl_mtype = IMPTYPE_NOOP; 540 x = splimp(); 541 IF_PREPEND(&sc->imp_if.if_snd, m); 542 splx(x); 543 } 544 if (sc->imp_cb.ic_oactive == 0) 545 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 546 } 547 548 #ifdef IMPLEADERS 549 printleader(routine, ip) 550 char *routine; 551 register struct imp_leader *ip; 552 { 553 printf("%s: ", routine); 554 printbyte((char *)ip, 12); 555 printf("<fmt=%x,net=%x,flags=%x,mtype=", ip->il_format, ip->il_network, 556 ip->il_flags); 557 if (ip->il_mtype <= IMPTYPE_READY) 558 printf("%s,", impleaders[ip->il_mtype]); 559 else 560 printf("%x,", ip->il_mtype); 561 printf("htype=%x,host=%x,imp=%x,link=", ip->il_htype, ip->il_host, 562 ip->il_impno); 563 if (ip->il_link == IMPLINK_IP) 564 printf("ip,"); 565 else 566 printf("%x,", ip->il_link); 567 printf("subtype=%x,len=%x>\n",ip->il_subtype,ntohs(ip->il_length)>>3); 568 } 569 570 printbyte(cp, n) 571 register char *cp; 572 int n; 573 { 574 register i, j, c; 575 576 for (i=0; i<n; i++) { 577 c = *cp++; 578 for (j=0; j<2; j++) 579 putchar("0123456789abcdef"[(c>>((1-j)*4))&0xf]); 580 putchar(' '); 581 } 582 putchar('\n'); 583 } 584 #endif 585 #endif 586