1 /* if_imp.c 4.26 82/04/24 */ 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/ubareg.h" 19 #include "../h/ubavar.h" 20 #include "../h/cpu.h" 21 #include "../h/mtpr.h" 22 #include "../h/vmmac.h" 23 #include "../net/in.h" 24 #include "../net/in_systm.h" 25 #include "../net/if.h" 26 #include "../net/if_imp.h" 27 #include "../net/if_imphost.h" 28 #include "../net/ip.h" 29 #include "../net/ip_var.h" 30 #include "../net/route.h" 31 #include <errno.h> 32 33 /* 34 * IMP software status per interface. 35 * (partially shared with the hardware specific module) 36 * 37 * Each interface is referenced by a network interface structure, 38 * imp_if, which the routing code uses to locate the interface. 39 * This structure contains the output queue for the interface, its 40 * address, ... IMP specific structures used in connecting the 41 * IMP software modules to the hardware specific interface routines 42 * are stored here. The common structures are made visible to the 43 * interface driver by passing a pointer to the hardware routine 44 * at "attach" time. 45 * 46 * NOTE: imp_if and imp_cb are assumed adjacent in hardware code. 47 */ 48 struct imp_softc { 49 struct ifnet imp_if; /* network visible interface */ 50 struct impcb imp_cb; /* hooks to hardware module */ 51 u_char imp_state; /* current state of IMP */ 52 char imp_dropcnt; /* used during initialization */ 53 } imp_softc[NIMP]; 54 55 /* 56 * Messages from IMP regarding why 57 * it's going down. 58 */ 59 static char *impmessage[] = { 60 "in 30 seconds", 61 "for hardware PM", 62 "to reload software", 63 "for emergency reset" 64 }; 65 66 int impdown(), impinit(), impoutput(); 67 68 /* 69 * IMP attach routine. Called from hardware device attach routine 70 * at configuration time with a pointer to the UNIBUS device structure. 71 * Sets up local state and returns pointer to base of ifnet+impcb 72 * structures. This is then used by the device's attach routine 73 * set up its back pointers. 74 */ 75 impattach(ui) 76 struct uba_device *ui; 77 { 78 struct imp_softc *sc = &imp_softc[ui->ui_unit]; 79 register struct ifnet *ifp = &sc->imp_if; 80 struct sockaddr_in *sin; 81 82 COUNT(IMPATTACH); 83 /* UNIT COULD BE AMBIGUOUS */ 84 ifp->if_unit = ui->ui_unit; 85 ifp->if_name = "imp"; 86 ifp->if_mtu = IMPMTU - sizeof(struct imp_leader); 87 ifp->if_net = ui->ui_flags; 88 /* the host and imp fields will be filled in by the imp */ 89 sin = (struct sockaddr_in *)&ifp->if_addr; 90 sin->sin_family = AF_INET; 91 sin->sin_addr = if_makeaddr(ifp->if_net, 0); 92 ifp->if_init = impinit; 93 ifp->if_output = impoutput; 94 /* reset is handled at the hardware level */ 95 if_attach(ifp); 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 int s = splimp(); 108 register struct imp_softc *sc = &imp_softc[unit]; 109 110 COUNT(IMPINIT); 111 if ((*sc->imp_cb.ic_init)(unit) == 0) { 112 sc->imp_state = IMPS_DOWN; 113 sc->imp_if.if_flags &= ~IFF_UP; 114 splx(s); 115 return; 116 } 117 sc->imp_state = IMPS_INIT; 118 impnoops(sc); 119 if_rtinit(&sc->imp_if, RTF_DIRECT|RTF_UP); 120 splx(s); 121 } 122 123 struct sockproto impproto = { PF_IMPLINK }; 124 struct sockaddr_in impdst = { AF_IMPLINK }; 125 struct sockaddr_in impsrc = { AF_IMPLINK }; 126 127 /* 128 * ARPAnet 1822 input routine. 129 * Called from hardware input interrupt routine to handle 1822 130 * IMP-host messages. Type 0 messages (non-control) are 131 * passed to higher level protocol processors on the basis 132 * of link number. Other type messages (control) are handled here. 133 */ 134 impinput(unit, m) 135 int unit; 136 register struct mbuf *m; 137 { 138 register struct imp_leader *ip; 139 register struct imp_softc *sc = &imp_softc[unit]; 140 register struct host *hp; 141 register struct ifqueue *inq; 142 struct control_leader *cp; 143 struct in_addr addr; 144 struct mbuf *next; 145 struct sockaddr_in *sin; 146 147 COUNT(IMPINPUT); 148 /* verify leader length. */ 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 /* check leader type */ 160 if (ip->il_format != IMP_NFF) { 161 sc->imp_if.if_collisions++; /* XXX */ 162 goto drop; 163 } 164 165 /* 166 * Certain messages require a host structure. 167 * Do this in one shot here. 168 */ 169 switch (ip->il_mtype) { 170 171 case IMPTYPE_RFNM: 172 case IMPTYPE_INCOMPLETE: 173 case IMPTYPE_HOSTDEAD: 174 case IMPTYPE_HOSTUNREACH: 175 case IMPTYPE_BADDATA: 176 #ifdef notdef 177 addr.s_net = ip->il_network; 178 #else 179 addr.s_net = 0; 180 #endif 181 addr.s_imp = ip->il_imp; 182 addr.s_host = ip->il_host; 183 hp = hostlookup(addr); 184 break; 185 } 186 187 switch (ip->il_mtype) { 188 189 case IMPTYPE_DATA: 190 break; 191 192 /* 193 * IMP leader error. Reset the IMP and discard the packet. 194 */ 195 case IMPTYPE_BADLEADER: 196 /* 197 * According to 1822 document, this message 198 * will be generated in response to the 199 * first noop sent to the IMP after 200 * the host resets the IMP interface. 201 */ 202 if (sc->imp_state != IMPS_INIT) { 203 impmsg(sc, "leader error"); 204 hostreset(sc->imp_if.if_net); 205 impnoops(sc); 206 } 207 goto drop; 208 209 /* 210 * IMP going down. Print message, and if not immediate, 211 * set off a timer to insure things will be reset at the 212 * appropriate time. 213 */ 214 case IMPTYPE_DOWN: 215 if ((ip->il_link & IMP_DMASK) == 0) { 216 sc->imp_state = IMPS_GOINGDOWN; 217 timeout(impdown, (caddr_t)sc, 30 * hz); 218 } 219 impmsg(sc, "going down %s", 220 (u_int)impmessage[ip->il_link&IMP_DMASK]); 221 goto drop; 222 223 /* 224 * A NOP usually seen during the initialization sequence. 225 * Compare the local address with that in the message. 226 * Reset the local address notion if it doesn't match. 227 */ 228 case IMPTYPE_NOOP: 229 if (sc->imp_state == IMPS_DOWN) { 230 sc->imp_state = IMPS_INIT; 231 sc->imp_dropcnt = IMP_DROPCNT; 232 } 233 if (sc->imp_state == IMPS_INIT && --sc->imp_dropcnt > 0) 234 goto drop; 235 sin = (struct sockaddr_in *)&sc->imp_if.if_addr; 236 if (sin->sin_addr.s_host != ip->il_host || 237 sin->sin_addr.s_imp != ip->il_imp) { 238 sc->imp_if.if_host[0] = 239 sin->sin_addr.s_host = ip->il_host; 240 sin->sin_addr.s_imp = ip->il_imp; 241 impmsg(sc, "reset (host %d/imp %d)", (u_int)ip->il_host, 242 ntohs(ip->il_imp)); 243 } 244 sc->imp_state = IMPS_UP; 245 sc->imp_if.if_flags |= IFF_UP; 246 /* restart output in case something was q'd */ 247 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 248 goto drop; 249 250 /* 251 * RFNM or INCOMPLETE message, send next 252 * message on the q. We could pass incomplete's 253 * up to the next level, but this currently isn't 254 * needed. 255 */ 256 case IMPTYPE_RFNM: 257 case IMPTYPE_INCOMPLETE: 258 if (hp && hp->h_rfnm && (next = hostdeque(hp))) 259 (void) impsnd(&sc->imp_if, next); 260 goto drop; 261 262 /* 263 * Host or IMP can't be reached. Flush any packets 264 * awaiting transmission and release the host structure. 265 */ 266 case IMPTYPE_HOSTDEAD: 267 case IMPTYPE_HOSTUNREACH: 268 impnotify(ip->il_mtype, ip, hp); 269 goto rawlinkin; 270 271 /* 272 * Error in data. Clear RFNM status for this host and send 273 * noops to the IMP to clear the interface. 274 */ 275 case IMPTYPE_BADDATA: 276 impmsg(sc, "data error"); 277 if (hp) 278 hp->h_rfnm = 0; 279 impnoops(sc); 280 goto drop; 281 282 /* 283 * Interface reset. 284 */ 285 case IMPTYPE_RESET: 286 impmsg(sc, "interface reset"); 287 impnoops(sc); 288 goto drop; 289 290 default: 291 sc->imp_if.if_collisions++; /* XXX */ 292 goto drop; 293 } 294 295 /* 296 * Data for a protocol. Dispatch to the appropriate 297 * protocol routine (running at software interrupt). 298 * If this isn't a raw interface, advance pointer 299 * into mbuf past leader. 300 */ 301 switch (ip->il_link) { 302 303 #ifdef INET 304 case IMPLINK_IP: 305 m->m_len -= sizeof(struct imp_leader); 306 m->m_off += sizeof(struct imp_leader); 307 schednetisr(NETISR_IP); 308 inq = &ipintrq; 309 break; 310 #endif 311 312 default: 313 rawlinkin: 314 impproto.sp_protocol = ip->il_link; 315 sin = (struct sockaddr_in *)&sc->imp_if.if_addr; 316 impdst.sin_addr = sin->sin_addr;; 317 impsrc.sin_addr.s_net = ip->il_network; 318 impsrc.sin_addr.s_host = ip->il_host; 319 impsrc.sin_addr.s_imp = ip->il_imp; 320 raw_input(m, &impproto, (struct sockaddr *)&impsrc, 321 (struct sockaddr *)&impdst); 322 return; 323 } 324 if (IF_QFULL(inq)) { 325 IF_DROP(inq); 326 goto drop; 327 } 328 IF_ENQUEUE(inq, m); 329 return; 330 331 drop: 332 m_freem(m); 333 } 334 335 /* 336 * Bring the IMP down after notification. 337 */ 338 impdown(sc) 339 struct imp_softc *sc; 340 { 341 342 sc->imp_state = IMPS_DOWN; 343 impmsg(sc, "marked down"); 344 if_down(&sc->imp_if); 345 } 346 347 /*VARARGS*/ 348 impmsg(sc, fmt, a1, a2) 349 struct imp_softc *sc; 350 char *fmt; 351 u_int a1; 352 { 353 354 printf("imp%d: ", sc->imp_if.if_unit); 355 printf(fmt, a1, a2); 356 printf("\n"); 357 } 358 359 /* 360 * Process an IMP "error" message, passing this 361 * up to the higher level protocol. 362 */ 363 impnotify(what, cp, hp) 364 int what; 365 struct control_leader *cp; 366 struct host *hp; 367 { 368 struct in_addr in; 369 370 #ifdef notdef 371 in.s_net = cp->dl_network; 372 #else 373 in.s_net = 10; 374 #endif 375 in.s_host = cp->dl_host; 376 in.s_imp = cp->dl_imp; 377 if (cp->dl_link != IMPLINK_IP) 378 raw_ctlinput(what, (caddr_t)&in); 379 else 380 ip_ctlinput(what, (caddr_t)&in); 381 if (hp) 382 hostfree(hp); 383 } 384 385 /* 386 * ARPAnet 1822 output routine. 387 * Called from higher level protocol routines to set up messages for 388 * transmission to the imp. Sets up the header and calls impsnd to 389 * enqueue the message for this IMP's hardware driver. 390 */ 391 impoutput(ifp, m0, dst) 392 register struct ifnet *ifp; 393 struct mbuf *m0; 394 struct sockaddr *dst; 395 { 396 register struct imp_leader *imp; 397 register struct mbuf *m = m0; 398 int x, dhost, dimp, dlink, len, dnet; 399 int error = 0; 400 401 COUNT(IMPOUTPUT); 402 /* 403 * Don't even try if the IMP is unavailable. 404 */ 405 if (imp_softc[ifp->if_unit].imp_state != IMPS_UP) { 406 error = ENETDOWN; 407 goto drop; 408 } 409 410 switch (dst->sa_family) { 411 412 #ifdef INET 413 case AF_INET: { 414 struct ip *ip = mtod(m0, struct ip *); 415 struct sockaddr_in *sin = (struct sockaddr_in *)dst; 416 417 dhost = sin->sin_addr.s_host; 418 dimp = sin->sin_addr.s_impno; 419 dlink = IMPLINK_IP; 420 dnet = 0; 421 len = ntohs((u_short)ip->ip_len); 422 break; 423 } 424 #endif 425 case AF_IMPLINK: 426 goto leaderexists; 427 428 default: 429 printf("imp%d: can't handle af%d\n", ifp->if_unit, 430 dst->sa_family); 431 error = EAFNOSUPPORT; 432 goto drop; 433 } 434 435 /* 436 * Add IMP leader. If there's not enough space in the 437 * first mbuf, allocate another. If that should fail, we 438 * drop this sucker. 439 */ 440 if (m->m_off > MMAXOFF || 441 MMINOFF + sizeof(struct imp_leader) > m->m_off) { 442 m = m_get(M_DONTWAIT); 443 if (m == 0) { 444 error = ENOBUFS; 445 goto drop; 446 } 447 m->m_next = m0; 448 m->m_off = MMINOFF; 449 m->m_len = sizeof(struct imp_leader); 450 } else { 451 m->m_off -= sizeof(struct imp_leader); 452 m->m_len += sizeof(struct imp_leader); 453 } 454 imp = mtod(m, struct imp_leader *); 455 imp->il_format = IMP_NFF; 456 imp->il_mtype = IMPTYPE_DATA; 457 imp->il_network = dnet; 458 imp->il_host = dhost; 459 imp->il_imp = htons((u_short)dimp); 460 imp->il_length = 461 htons((u_short)(len + sizeof(struct imp_leader)) << 3); 462 imp->il_link = dlink; 463 imp->il_flags = imp->il_htype = imp->il_subtype = 0; 464 465 leaderexists: 466 return (impsnd(ifp, m)); 467 drop: 468 m_freem(m0); 469 return (error); 470 } 471 472 /* 473 * Put a message on an interface's output queue. 474 * Perform RFNM counting: no more than 8 message may be 475 * in flight to any one host. 476 */ 477 impsnd(ifp, m) 478 struct ifnet *ifp; 479 struct mbuf *m; 480 { 481 register struct imp_leader *ip; 482 register struct host *hp; 483 struct impcb *icp; 484 int x; 485 486 COUNT(IMPSND); 487 ip = mtod(m, struct imp_leader *); 488 489 /* 490 * Do RFNM counting for data messages 491 * (no more than 8 outstanding to any host) 492 */ 493 x = splimp(); 494 if (ip->il_mtype == IMPTYPE_DATA) { 495 struct in_addr addr; 496 497 #ifdef notdef 498 addr.s_net = ip->il_network; 499 #else 500 addr.s_net = 0; 501 #endif 502 addr.s_host = ip->il_host; 503 addr.s_imp = ip->il_imp; 504 if ((hp = hostlookup(addr)) == 0) 505 hp = hostenter(addr); 506 507 /* 508 * If IMP would block, queue until RFNM 509 */ 510 if (hp) { 511 if (hp->h_rfnm < 8) { 512 hp->h_rfnm++; 513 goto enque; 514 } 515 if (hp->h_qcnt < 8) { /* high water mark */ 516 HOST_ENQUE(hp, m); 517 goto start; 518 } 519 } 520 m_freem(m); 521 splx(x); 522 return (ENOBUFS); /* XXX */ 523 } 524 enque: 525 if (IF_QFULL(&ifp->if_snd)) { 526 IF_DROP(&ifp->if_snd); 527 m_freem(m); 528 splx(x); 529 return (ENOBUFS); /* XXX */ 530 } 531 IF_ENQUEUE(&ifp->if_snd, m); 532 start: 533 splx(x); 534 icp = &imp_softc[ifp->if_unit].imp_cb; 535 if (icp->ic_oactive == 0) 536 (*icp->ic_start)(ifp->if_unit); 537 return (0); 538 } 539 540 /* 541 * Put three 1822 NOOPs at the head of the output queue. 542 * Part of host-IMP initialization procedure. 543 * (Should return success/failure, but noone knows 544 * what to do with this, so why bother?) 545 */ 546 impnoops(sc) 547 register struct imp_softc *sc; 548 { 549 register i; 550 register struct mbuf *m; 551 register struct control_leader *cp; 552 int x; 553 554 COUNT(IMPNOOPS); 555 sc->imp_dropcnt = IMP_DROPCNT; 556 for (i = 0; i < IMP_DROPCNT + 1; i++ ) { 557 if ((m = m_getclr(M_DONTWAIT)) == 0) 558 return; 559 m->m_off = MMINOFF; 560 m->m_len = sizeof(struct control_leader); 561 cp = mtod(m, struct control_leader *); 562 cp->dl_format = IMP_NFF; 563 cp->dl_link = i; 564 cp->dl_mtype = IMPTYPE_NOOP; 565 x = splimp(); 566 IF_PREPEND(&sc->imp_if.if_snd, m); 567 splx(x); 568 } 569 if (sc->imp_cb.ic_oactive == 0) 570 (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); 571 } 572 #endif 573