1 /* if_imp.c 4.13 82/03/12 */ 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 register struct imp_leader *ip; 134 register struct imp_softc *sc = &imp_softc[unit]; 135 register struct host *hp; 136 register struct ifqueue *inq; 137 struct control_leader *cp; 138 struct in_addr addr; 139 struct mbuf *next; 140 141 COUNT(IMPINPUT); 142 /* 143 * Verify leader length. Be careful with control 144 * message which don't get a length included. 145 * We should generate a "bad leader" message 146 * to the IMP about messages too short. 147 */ 148 if (m->m_len < sizeof(struct control_leader) && 149 (m = m_pullup(m, sizeof(struct control_leader))) == 0) 150 return; 151 cp = mtod(m, struct control_leader *); 152 if (cp->dl_mtype == IMPTYPE_DATA) 153 if (m->m_len < sizeof(struct imp_leader) && 154 (m = m_pullup(m, sizeof(struct imp_leader))) == 0) 155 return; 156 ip = mtod(m, struct imp_leader *); 157 158 /* 159 * Check leader type -- should notify IMP 160 * in case of failure... 161 */ 162 if (ip->il_format != IMP_NFF) { 163 sc->imp_if.if_collisions++; /* XXX */ 164 goto drop; 165 } 166 167 /* 168 * Certain messages require a host structure. 169 * Do this in one shot here. 170 */ 171 switch (ip->il_mtype) { 172 173 case IMPTYPE_RFNM: 174 case IMPTYPE_INCOMPLETE: 175 case IMPTYPE_HOSTDEAD: 176 case IMPTYPE_HOSTUNREACH: 177 case IMPTYPE_BADDATA: 178 #ifdef notdef 179 addr.s_net = ip->il_network; 180 #else 181 addr.s_net = 0; 182 #endif 183 addr.s_imp = ip->il_imp; 184 addr.s_host = ip->il_host; 185 hp = hostlookup(addr); 186 break; 187 } 188 189 switch (ip->il_mtype) { 190 191 /* 192 * Data for a protocol. Dispatch to the appropriate 193 * protocol routine (running at software interrupt). 194 * If this isn't a raw interface, advance pointer 195 * into mbuf past leader (done below). 196 */ 197 case IMPTYPE_DATA: 198 ip->il_length = 199 (ntohs(ip->il_length) >> 3) - sizeof(struct imp_leader); 200 break; 201 202 /* 203 * IMP leader error. Reset the IMP and discard the packet. 204 */ 205 case IMPTYPE_BADLEADER: 206 /* 207 * According to 1822 document, this message 208 * will be generated in response to the 209 * first noop sent to the IMP after 210 * the host resets the IMP interface. 211 */ 212 if (sc->imp_state != IMPS_INIT) { 213 impmsg(sc, "leader error"); 214 hostreset(sc->imp_if.if_net); /* XXX */ 215 impnoops(sc); 216 } 217 goto rawlinkin; 218 219 /* 220 * IMP going down. Print message, and if not immediate, 221 * set off a timer to insure things will be reset at the 222 * appropriate time. 223 */ 224 case IMPTYPE_DOWN: 225 if ((ip->il_link & IMP_DMASK) == 0) { 226 sc->imp_state = IMPS_GOINGDOWN; 227 timeout(impdown, sc, 30 * hz); 228 } 229 impmsg(sc, "going down %s", impmessage[ip->il_link&IMP_DMASK]); 230 goto rawlinkin; 231 232 /* 233 * A NOP usually seen during the initialization sequence. 234 * Compare the local address with that in the message. 235 * Reset the local address notion if it doesn't match. 236 */ 237 case IMPTYPE_NOOP: { 238 register struct in_addr *sin; 239 240 if (sc->imp_state == IMPS_DOWN) { 241 sc->imp_state = IMPS_INIT; 242 sc->imp_dropcnt = IMP_DROPCNT; 243 } 244 if (sc->imp_state != IMPS_INIT || --sc->imp_dropcnt > 0) 245 goto rawlinkin; 246 sc->imp_state = IMPS_UP; 247 sin = &sc->imp_if.if_addr; 248 sc->imp_if.if_host[0] = sin->s_host = ip->il_host; 249 sin->s_imp = ip->il_imp; 250 impmsg(sc, "reset (host %d/imp %d)", ip->il_host, 251 ntohs(ip->il_imp)); 252 /* restart output in case something was q'd */ 253 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 254 goto rawlinkin; 255 } 256 257 /* 258 * RFNM or INCOMPLETE message, record in 259 * host table and prime output routine. 260 * 261 * SHOULD NOTIFY PROTOCOL ABOUT INCOMPLETES. 262 */ 263 case IMPTYPE_RFNM: 264 case IMPTYPE_INCOMPLETE: 265 if (hp && hp->h_rfnm) 266 if (next = hostdeque(hp)) 267 (void) impsnd(sc, next); 268 goto rawlinkin; 269 270 /* 271 * Host or IMP can't be reached. Flush any packets 272 * awaiting transmission and release the host structure. 273 * 274 * TODO: NOTIFY THE PROTOCOL 275 */ 276 case IMPTYPE_HOSTDEAD: 277 impmsg(sc, "host dead"); /* XXX */ 278 goto common; /* XXX */ 279 280 /* SHOULD SIGNAL ROUTING DAEMON */ 281 case IMPTYPE_HOSTUNREACH: 282 impmsg(sc, "host unreachable"); /* XXX */ 283 common: 284 if (hp) 285 hostfree(hp); /* won't work right */ 286 goto rawlinkin; 287 288 /* 289 * Error in data. Clear RFNM status for this host and send 290 * noops to the IMP to clear the interface. 291 */ 292 case IMPTYPE_BADDATA: 293 impmsg(sc, "data error"); 294 if (hp) 295 hp->h_rfnm = 0; 296 impnoops(sc); 297 goto rawlinkin; 298 299 /* 300 * Interface reset. 301 */ 302 case IMPTYPE_RESET: 303 impmsg(sc, "interface reset"); 304 impnoops(sc); 305 goto rawlinkin; 306 307 default: 308 sc->imp_if.if_collisions++; /* XXX */ 309 goto rawlinkin; 310 } 311 312 /* 313 * Queue on protocol's input queue. 314 */ 315 switch (ip->il_link) { 316 317 #ifdef INET 318 case IMPLINK_IP: 319 m->m_len -= sizeof(struct imp_leader); 320 m->m_off += sizeof(struct imp_leader); 321 setipintr(); 322 inq = &ipintrq; 323 break; 324 #endif 325 326 default: 327 rawlinkin: 328 impproto.sp_protocol = ip->il_link; 329 impdst.sin_addr = sc->imp_if.if_addr; 330 impsrc.sin_addr.s_net = ip->il_network; 331 impsrc.sin_addr.s_host = ip->il_host; 332 impsrc.sin_addr.s_imp = ip->il_imp; 333 raw_input(m, &impproto, &impdst, &impsrc); 334 return; 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 sc->imp_state = IMPS_DOWN; 350 impmsg(sc, "marked down"); 351 /* notify protocols with messages waiting? */ 352 } 353 354 /*VARARGS*/ 355 impmsg(sc, fmt, a1, a2) 356 struct imp_softc *sc; 357 char *fmt; 358 { 359 printf("imp%d: ", sc->imp_if.if_unit); 360 printf(fmt, a1, a2); 361 printf("\n"); 362 } 363 364 /* 365 * ARPAnet 1822 output routine. 366 * Called from higher level protocol routines to set up messages for 367 * transmission to the imp. Sets up the header and calls impsnd to 368 * enqueue the message for this IMP's hardware driver. 369 */ 370 impoutput(ifp, m0, pf) 371 register struct ifnet *ifp; 372 struct mbuf *m0; 373 { 374 register struct imp_leader *imp; 375 register struct mbuf *m = m0; 376 int x, dhost, dimp, dlink, len; 377 378 COUNT(IMPOUTPUT); 379 /* 380 * Don't even try if the IMP is unavailable. 381 */ 382 x = imp_softc[ifp->if_unit].imp_state; 383 if (x == IMPS_DOWN || x == IMPS_GOINGDOWN) 384 goto drop; 385 386 switch (pf) { 387 388 #ifdef INET 389 case PF_INET: { 390 register struct ip *ip = mtod(m0, struct ip *); 391 392 dhost = ip->ip_dst.s_host; 393 dimp = ip->ip_dst.s_imp; 394 dlink = IMPLINK_IP; 395 len = ntohs(ip->ip_len); 396 break; 397 } 398 #endif 399 case PF_IMPLINK: 400 goto leaderexists; 401 402 default: 403 printf("imp%d: can't encapsulate pf%d\n", ifp->if_unit, pf); 404 goto drop; 405 } 406 407 /* 408 * Add IMP leader. If there's not enough space in the 409 * first mbuf, allocate another. If that should fail, we 410 * drop this sucker. 411 */ 412 if (m->m_off > MMAXOFF || 413 MMINOFF + sizeof(struct imp_leader) > m->m_off) { 414 m = m_get(M_DONTWAIT); 415 if (m == 0) 416 goto drop; 417 m->m_next = m0; 418 m->m_off = MMINOFF; 419 m->m_len = sizeof(struct imp_leader); 420 } else { 421 m->m_off -= sizeof(struct imp_leader); 422 m->m_len += sizeof(struct imp_leader); 423 } 424 imp = mtod(m, struct imp_leader *); 425 imp->il_format = IMP_NFF; 426 imp->il_mtype = IMPTYPE_DATA; 427 imp->il_network = 0; 428 imp->il_host = dhost; 429 imp->il_imp = dimp; 430 imp->il_length = htons((len + sizeof(struct imp_leader)) << 3); 431 imp->il_link = dlink; 432 imp->il_flags = imp->il_htype = imp->il_subtype = 0; 433 434 leaderexists: 435 /* 436 * Hand message to impsnd to perform RFNM counting 437 * and eventual transmission. 438 */ 439 return (impsnd(ifp, m)); 440 drop: 441 m_freem(m0); 442 return (0); 443 } 444 445 /* 446 * Put a message on an interface's output queue. 447 * Perform RFNM counting: no more than 8 message may be 448 * in flight to any one host. 449 */ 450 impsnd(ifp, m) 451 struct ifnet *ifp; 452 struct mbuf *m; 453 { 454 register struct imp_leader *ip; 455 register struct host *hp; 456 struct impcb *icp; 457 int x; 458 459 COUNT(IMPSND); 460 ip = mtod(m, struct imp_leader *); 461 462 /* 463 * Do RFNM counting for data messages 464 * (no more than 8 outstanding to any host) 465 */ 466 x = splimp(); 467 if (ip->il_mtype == IMPTYPE_DATA) { 468 struct in_addr addr; 469 470 #ifdef notdef 471 addr.s_net = ip->il_network; 472 #else 473 addr.s_net = 0; 474 #endif 475 addr.s_host = ip->il_host; 476 addr.s_imp = ip->il_imp; 477 if ((hp = hostlookup(addr)) == 0) 478 hp = hostenter(addr); 479 480 /* 481 * If IMP would block, queue until RFNM 482 */ 483 if (hp) { 484 if (hp->h_rfnm < 8) { 485 hp->h_rfnm++; 486 goto enque; 487 } 488 if (hp->h_qcnt < 8) { /* high water mark */ 489 HOST_ENQUE(hp, m); 490 goto start; 491 } 492 } 493 m_freem(m); 494 splx(x); 495 return (0); 496 } 497 enque: 498 IF_ENQUEUE(&ifp->if_snd, m); 499 start: 500 splx(x); 501 icp = &imp_softc[ifp->if_unit].imp_cb; 502 if (icp->ic_oactive == 0) 503 (*icp->ic_start)(ifp->if_unit); 504 return (1); 505 } 506 507 /* 508 * Put three 1822 NOOPs at the head of the output queue. 509 * Part of host-IMP initialization procedure. 510 * (Should return success/failure, but noone knows 511 * what to do with this, so why bother?) 512 */ 513 impnoops(sc) 514 register struct imp_softc *sc; 515 { 516 register i; 517 register struct mbuf *m; 518 register struct control_leader *cp; 519 int x; 520 521 COUNT(IMPNOOPS); 522 sc->imp_state = IMPS_INIT; 523 sc->imp_dropcnt = IMP_DROPCNT; 524 for (i = 0; i < IMP_DROPCNT + 1; i++ ) { 525 if ((m = m_getclr(M_DONTWAIT)) == 0) 526 return; 527 m->m_off = MMINOFF; 528 m->m_len = sizeof(struct control_leader); 529 cp = mtod(m, struct control_leader *); 530 cp->dl_format = IMP_NFF; 531 cp->dl_link = i; 532 cp->dl_mtype = IMPTYPE_NOOP; 533 x = splimp(); 534 IF_PREPEND(&sc->imp_if.if_snd, m); 535 splx(x); 536 } 537 if (sc->imp_cb.ic_oactive == 0) 538 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 539 } 540 541 #ifdef IMPLEADERS 542 printleader(routine, ip) 543 char *routine; 544 register struct imp_leader *ip; 545 { 546 printf("%s: ", routine); 547 printbyte((char *)ip, 12); 548 printf("<fmt=%x,net=%x,flags=%x,mtype=", ip->il_format, ip->il_network, 549 ip->il_flags); 550 if (ip->il_mtype <= IMPTYPE_READY) 551 printf("%s,", impleaders[ip->il_mtype]); 552 else 553 printf("%x,", ip->il_mtype); 554 printf("htype=%x,host=%x,imp=%x,link=", ip->il_htype, ip->il_host, 555 ip->il_impno); 556 if (ip->il_link == IMPLINK_IP) 557 printf("ip,"); 558 else 559 printf("%x,", ip->il_link); 560 printf("subtype=%x,len=%x>\n",ip->il_subtype,ntohs(ip->il_length)>>3); 561 } 562 563 printbyte(cp, n) 564 register char *cp; 565 int n; 566 { 567 register i, j, c; 568 569 for (i=0; i<n; i++) { 570 c = *cp++; 571 for (j=0; j<2; j++) 572 putchar("0123456789abcdef"[(c>>((1-j)*4))&0xf]); 573 putchar(' '); 574 } 575 putchar('\n'); 576 } 577 #endif 578 #endif 579