1 /* if_imp.c 4.14 82/03/13 */ 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, (caddr_t)sc, 30 * hz); 228 } 229 impmsg(sc, "going down %s", 230 (u_int)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)", (u_int)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->imp_if, 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, (struct sockaddr *)&impdst, 335 (struct sockaddr *)&impsrc); 336 return; 337 } 338 IF_ENQUEUE(inq, m); 339 return; 340 341 drop: 342 m_freem(m); 343 } 344 345 /* 346 * Bring the IMP down after notification. 347 */ 348 impdown(sc) 349 struct imp_softc *sc; 350 { 351 sc->imp_state = IMPS_DOWN; 352 impmsg(sc, "marked down"); 353 /* notify protocols with messages waiting? */ 354 } 355 356 /*VARARGS*/ 357 impmsg(sc, fmt, a1, a2) 358 struct imp_softc *sc; 359 char *fmt; 360 u_int a1; 361 { 362 printf("imp%d: ", sc->imp_if.if_unit); 363 printf(fmt, a1, a2); 364 printf("\n"); 365 } 366 367 /* 368 * ARPAnet 1822 output routine. 369 * Called from higher level protocol routines to set up messages for 370 * transmission to the imp. Sets up the header and calls impsnd to 371 * enqueue the message for this IMP's hardware driver. 372 */ 373 impoutput(ifp, m0, pf) 374 register struct ifnet *ifp; 375 struct mbuf *m0; 376 { 377 register struct imp_leader *imp; 378 register struct mbuf *m = m0; 379 int x, dhost, dimp, dlink, len; 380 381 COUNT(IMPOUTPUT); 382 /* 383 * Don't even try if the IMP is unavailable. 384 */ 385 x = imp_softc[ifp->if_unit].imp_state; 386 if (x == IMPS_DOWN || x == IMPS_GOINGDOWN) 387 goto drop; 388 389 switch (pf) { 390 391 #ifdef INET 392 case PF_INET: { 393 register struct ip *ip = mtod(m0, struct ip *); 394 395 dhost = ip->ip_dst.s_host; 396 dimp = ip->ip_dst.s_imp; 397 dlink = IMPLINK_IP; 398 len = ntohs((u_short)ip->ip_len); 399 break; 400 } 401 #endif 402 case PF_IMPLINK: 403 goto leaderexists; 404 405 default: 406 printf("imp%d: can't encapsulate pf%d\n", ifp->if_unit, pf); 407 goto drop; 408 } 409 410 /* 411 * Add IMP leader. If there's not enough space in the 412 * first mbuf, allocate another. If that should fail, we 413 * drop this sucker. 414 */ 415 if (m->m_off > MMAXOFF || 416 MMINOFF + sizeof(struct imp_leader) > m->m_off) { 417 m = m_get(M_DONTWAIT); 418 if (m == 0) 419 goto drop; 420 m->m_next = m0; 421 m->m_off = MMINOFF; 422 m->m_len = sizeof(struct imp_leader); 423 } else { 424 m->m_off -= sizeof(struct imp_leader); 425 m->m_len += sizeof(struct imp_leader); 426 } 427 imp = mtod(m, struct imp_leader *); 428 imp->il_format = IMP_NFF; 429 imp->il_mtype = IMPTYPE_DATA; 430 imp->il_network = 0; 431 imp->il_host = dhost; 432 imp->il_imp = dimp; 433 imp->il_length = 434 htons((u_short)(len + sizeof(struct imp_leader)) << 3); 435 imp->il_link = dlink; 436 imp->il_flags = imp->il_htype = imp->il_subtype = 0; 437 438 leaderexists: 439 /* 440 * Hand message to impsnd to perform RFNM counting 441 * and eventual transmission. 442 */ 443 return (impsnd(ifp, m)); 444 drop: 445 m_freem(m0); 446 return (0); 447 } 448 449 /* 450 * Put a message on an interface's output queue. 451 * Perform RFNM counting: no more than 8 message may be 452 * in flight to any one host. 453 */ 454 impsnd(ifp, m) 455 struct ifnet *ifp; 456 struct mbuf *m; 457 { 458 register struct imp_leader *ip; 459 register struct host *hp; 460 struct impcb *icp; 461 int x; 462 463 COUNT(IMPSND); 464 ip = mtod(m, struct imp_leader *); 465 466 /* 467 * Do RFNM counting for data messages 468 * (no more than 8 outstanding to any host) 469 */ 470 x = splimp(); 471 if (ip->il_mtype == IMPTYPE_DATA) { 472 struct in_addr addr; 473 474 #ifdef notdef 475 addr.s_net = ip->il_network; 476 #else 477 addr.s_net = 0; 478 #endif 479 addr.s_host = ip->il_host; 480 addr.s_imp = ip->il_imp; 481 if ((hp = hostlookup(addr)) == 0) 482 hp = hostenter(addr); 483 484 /* 485 * If IMP would block, queue until RFNM 486 */ 487 if (hp) { 488 if (hp->h_rfnm < 8) { 489 hp->h_rfnm++; 490 goto enque; 491 } 492 if (hp->h_qcnt < 8) { /* high water mark */ 493 HOST_ENQUE(hp, m); 494 goto start; 495 } 496 } 497 m_freem(m); 498 splx(x); 499 return (0); 500 } 501 enque: 502 IF_ENQUEUE(&ifp->if_snd, m); 503 start: 504 splx(x); 505 icp = &imp_softc[ifp->if_unit].imp_cb; 506 if (icp->ic_oactive == 0) 507 (*icp->ic_start)(ifp->if_unit); 508 return (1); 509 } 510 511 /* 512 * Put three 1822 NOOPs at the head of the output queue. 513 * Part of host-IMP initialization procedure. 514 * (Should return success/failure, but noone knows 515 * what to do with this, so why bother?) 516 */ 517 impnoops(sc) 518 register struct imp_softc *sc; 519 { 520 register i; 521 register struct mbuf *m; 522 register struct control_leader *cp; 523 int x; 524 525 COUNT(IMPNOOPS); 526 sc->imp_state = IMPS_INIT; 527 sc->imp_dropcnt = IMP_DROPCNT; 528 for (i = 0; i < IMP_DROPCNT + 1; i++ ) { 529 if ((m = m_getclr(M_DONTWAIT)) == 0) 530 return; 531 m->m_off = MMINOFF; 532 m->m_len = sizeof(struct control_leader); 533 cp = mtod(m, struct control_leader *); 534 cp->dl_format = IMP_NFF; 535 cp->dl_link = i; 536 cp->dl_mtype = IMPTYPE_NOOP; 537 x = splimp(); 538 IF_PREPEND(&sc->imp_if.if_snd, m); 539 splx(x); 540 } 541 if (sc->imp_cb.ic_oactive == 0) 542 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 543 } 544 545 #ifdef IMPLEADERS 546 printleader(routine, ip) 547 char *routine; 548 register struct imp_leader *ip; 549 { 550 printf("%s: ", routine); 551 printbyte((char *)ip, 12); 552 printf("<fmt=%x,net=%x,flags=%x,mtype=", ip->il_format, ip->il_network, 553 ip->il_flags); 554 if (ip->il_mtype <= IMPTYPE_READY) 555 printf("%s,", impleaders[ip->il_mtype]); 556 else 557 printf("%x,", ip->il_mtype); 558 printf("htype=%x,host=%x,imp=%x,link=", ip->il_htype, ip->il_host, 559 ip->il_impno); 560 if (ip->il_link == IMPLINK_IP) 561 printf("ip,"); 562 else 563 printf("%x,", ip->il_link); 564 printf("subtype=%x,len=%x>\n",ip->il_subtype,ntohs(ip->il_length)>>3); 565 } 566 567 printbyte(cp, n) 568 register char *cp; 569 int n; 570 { 571 register i, j, c; 572 573 for (i=0; i<n; i++) { 574 c = *cp++; 575 for (j=0; j<2; j++) 576 putchar("0123456789abcdef"[(c>>((1-j)*4))&0xf]); 577 putchar(' '); 578 } 579 putchar('\n'); 580 } 581 #endif 582 #endif 583