Commit | Line | Data |
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a0b7c7fb | 1 | /* if_imp.c 4.3 82/02/01 */ |
6c73ade6 BJ |
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/host.h" | |
28 | #include "../net/ip.h" | |
29 | #include "../net/ip_var.h" | |
30 | ||
31 | /* | |
32 | * IMP software status per interface. | |
33 | * (partially shared with the hardware specific module) | |
34 | * | |
35 | * Each interface is referenced by a network interface structure, | |
36 | * imp_if, which the routing code uses to locate the interface. | |
37 | * This structure contains the output queue for the interface, its | |
38 | * address, ... IMP specific structures used in connecting the | |
39 | * IMP software modules to the hardware specific interface routines | |
40 | * are also stored here. These structures are visible in the interface | |
41 | * driver through back pointers set up in the hardware's attach routine. | |
42 | * | |
43 | * NOTE: imp_if and imp_cb are assumed adjacent in hardware code. | |
44 | */ | |
45 | struct imp_softc { | |
46 | struct ifnet imp_if; /* network visible interface */ | |
47 | struct impcb imp_cb; /* hooks to hardware module */ | |
48 | u_char imp_state; /* current state of IMP */ | |
49 | char imp_dropcnt; /* used during initialization */ | |
50 | short imp_timer; /* going down timer */ | |
51 | } imp_softc[NIMP]; | |
52 | ||
53 | /* | |
54 | * Messages from IMP regarding why | |
55 | * it's going down. | |
56 | */ | |
57 | static char *impmsg[] = { | |
58 | "in 30 seconds", | |
59 | "for hardware PM", | |
60 | "to reload software", | |
61 | "for emergency reset" | |
62 | }; | |
63 | ||
64 | /* | |
65 | * IMP attach routine. Called from hardware device attach routine | |
66 | * at configuration time with a pointer to the UNIBUS device structure. | |
67 | * Sets up local state and returns pointer to base of ifnet+impcb | |
68 | * structures. This is then used by the device's attach routine | |
69 | * set up its back pointers. | |
70 | */ | |
71 | impattach(ui) | |
72 | struct uba_device *ui; | |
73 | { | |
74 | struct imp_softc *sc = &imp_softc[ui->ui_unit]; | |
75 | register struct ifnet *ifp = &sc->imp_if; | |
76 | ||
77 | COUNT(IMPATTACH); | |
78 | /* UNIT COULD BE AMBIGUOUS */ | |
79 | ifp->if_unit = ui->ui_unit; | |
80 | ifp->if_name = "imp"; | |
81 | ifp->if_mtu = IMP_MTU; | |
82 | ifp->if_net = ui->ui_flags; | |
83 | /* ifp->if_host = ... */ | |
84 | /* ifp->if_addr = if_makeaddr(ifp->if_net, ifp->if_host); */ | |
85 | if_attach(ifp); | |
86 | /* kludge to hand pointers back to hardware attach routine */ | |
87 | return ((int)&sc->imp_if); | |
88 | } | |
89 | ||
90 | /* | |
91 | * IMP initialization routine: call hardware module to | |
92 | * setup UNIBUS resources, init state and get ready for | |
93 | * NOOPs the IMP should send us, and that we want to drop. | |
94 | */ | |
95 | impinit(unit) | |
96 | int unit; | |
97 | { | |
98 | register struct imp_softc *sc = &imp_softc[unit]; | |
99 | ||
100 | (*sc->imp_cb.ic_init)(unit); | |
101 | sc->imp_state = IMPS_INIT; | |
102 | sc->imp_dropcnt = IMP_DROPCNT; | |
103 | } | |
104 | ||
105 | struct sockproto impproto = { PF_IMPLINK }; | |
faad37c0 SL |
106 | struct sockaddr_in impdst = { AF_IMPLINK }; |
107 | struct sockaddr_in impsrc = { AF_IMPLINK }; | |
6c73ade6 BJ |
108 | |
109 | /* | |
110 | * ARPAnet 1822 input routine. | |
111 | * Called from hardware input interrupt routine to handle 1822 | |
112 | * IMP-host messages. Type 0 messages (non-control) are | |
113 | * passed to higher level protocol processors on the basis | |
114 | * of link number. Other type messages (control) are handled here. | |
115 | */ | |
116 | impinput(unit, m0) | |
117 | int unit; | |
118 | struct mbuf *m0; | |
119 | { | |
120 | int s; | |
121 | register struct mbuf *m; | |
122 | register struct imp_leader *ip; | |
123 | register struct imp_softc *sc = &imp_softc[unit]; | |
124 | register struct host *hp; | |
125 | register struct ifqueue *inq; | |
126 | struct in_addr addr; | |
127 | ||
128 | COUNT(IMP_INPUT); | |
129 | m = m0; | |
a0b7c7fb SL |
130 | |
131 | /* | |
132 | * We should generate a "bad leader" message | |
133 | * to the IMP about messages too short. | |
134 | */ | |
6c73ade6 BJ |
135 | if (m->m_len < sizeof(struct imp_leader) && |
136 | m_pullup(m, sizeof(struct imp_leader)) == 0) | |
137 | goto drop; | |
138 | ip = mtod(m, struct imp_leader *); | |
139 | ||
a0b7c7fb SL |
140 | /* |
141 | * Check leader type -- should notify IMP | |
142 | * in case of failure... | |
143 | */ | |
6c73ade6 BJ |
144 | if (ip->il_format != IMP_NFF) |
145 | goto drop; | |
146 | ||
147 | /* | |
148 | * Certain messages require a host structure. | |
149 | * Do this in one shot here. | |
150 | */ | |
151 | switch (ip->il_mtype) { | |
152 | ||
153 | case IMPTYPE_RFNM: | |
154 | case IMPTYPE_INCOMPLETE: | |
155 | case IMPTYPE_HOSTDEAD: | |
156 | case IMPTYPE_HOSTUNREACH: | |
157 | case IMPTYPE_BADDATA: | |
a0b7c7fb | 158 | addr.s_host = ntohs(ip->il_host); /* XXX */ |
6c73ade6 BJ |
159 | hp = h_lookup(addr); |
160 | break; | |
161 | } | |
162 | ||
163 | switch (ip->il_mtype) { | |
164 | ||
165 | /* | |
166 | * Data for a protocol. Dispatch to the appropriate | |
167 | * protocol routine (running at software interrupt). | |
168 | * If this isn't a raw interface, advance pointer | |
a0b7c7fb | 169 | * into mbuf past leader (done below). |
6c73ade6 BJ |
170 | */ |
171 | case IMPTYPE_DATA: | |
172 | ip->il_length = ntohs(ip->il_length) >> 3; | |
173 | break; | |
174 | ||
175 | /* | |
176 | * IMP leader error. Reset the IMP and discard the packet. | |
177 | */ | |
178 | case IMPTYPE_BADLEADER: | |
a0b7c7fb SL |
179 | /* |
180 | * According to 1822 document, this message | |
181 | * will be generated in response to the | |
182 | * first noop sent to the IMP after | |
183 | * the host resets the IMP interface. | |
184 | */ | |
185 | if (sc->imp_state != IMPS_RESET) { | |
186 | imperr(sc, "leader error"); | |
187 | h_reset(sc->imp_if.if_net); /* XXX */ | |
188 | impnoops(sc); | |
189 | } | |
6c73ade6 BJ |
190 | goto drop; |
191 | ||
192 | /* | |
193 | * IMP going down. Print message, and if not immediate, | |
194 | * set off a timer to insure things will be reset at the | |
195 | * appropriate time. | |
196 | */ | |
197 | case IMPTYPE_DOWN: | |
198 | if ((ip->il_link & IMP_DMASK) == 0) { | |
199 | sc->imp_state = IMPS_GOINGDOWN; | |
a0b7c7fb | 200 | timeout(impdown, sc, 30 * 60 * HZ); |
6c73ade6 BJ |
201 | } |
202 | imperr(sc, "going down %s", impmsg[ip->il_link & IMP_DMASK]); | |
203 | goto drop; | |
204 | ||
205 | /* | |
206 | * A NOP usually seen during the initialization sequence. | |
207 | * Compare the local address with that in the message. | |
208 | * Reset the local address notion if it doesn't match. | |
209 | */ | |
210 | case IMPTYPE_NOOP: | |
a0b7c7fb SL |
211 | if (sc->imp_state == IMPS_DOWN) { |
212 | sc->imp_state = IMPS_INIT; | |
213 | sc->imp_dropcnt = IMP_DROPCNT; | |
214 | } | |
6c73ade6 BJ |
215 | if (sc->imp_state == IMPS_INIT && --sc->imp_dropcnt == 0) { |
216 | sc->imp_state = IMPS_UP; | |
217 | /* restart output in case something was q'd */ | |
218 | (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); | |
219 | } | |
220 | if (ip->il_host != sc->imp_if.if_addr.s_host || | |
221 | ip->il_impno != sc->imp_if.if_addr.s_imp) { | |
222 | sc->imp_if.if_addr.s_host = ip->il_host; | |
223 | sc->imp_if.if_addr.s_imp = ip->il_imp; | |
224 | imperr(sc, "imp%d: address set to %d/%d\n", | |
225 | ip->il_host, ip->il_impno); | |
226 | } | |
227 | goto drop; | |
228 | ||
229 | /* | |
230 | * RFNM or INCOMPLETE message, record in | |
231 | * host table and prime output routine. | |
232 | * | |
a0b7c7fb | 233 | * SHOULD NOTIFY PROTOCOL ABOUT INCOMPLETES. |
6c73ade6 BJ |
234 | */ |
235 | case IMPTYPE_RFNM: | |
236 | case IMPTYPE_INCOMPLETE: | |
237 | if (hp && hp->h_rfnm) { | |
238 | register struct mbuf *n; | |
239 | ||
240 | hp->h_rfnm--; | |
241 | /* poke holding queue */ | |
242 | if (n = hp->h_q) { | |
243 | if (n->m_act == n) | |
244 | hp->h_q = 0; | |
245 | else { | |
246 | n = n->m_act; | |
247 | hp->h_q->m_act = n->m_act; | |
248 | } | |
249 | (void) impsnd(n, sc); | |
250 | } | |
251 | } | |
252 | break; | |
253 | ||
254 | /* | |
255 | * Host or IMP can't be reached. Flush any packets | |
256 | * awaiting transmission and release the host structure. | |
257 | * | |
258 | * HOW DO WE NOTIFY THE PROTOCOL? | |
259 | * HOW DO WE AGE THE HOST STRUCTURE TO SAVE STATUS? | |
260 | */ | |
261 | case IMPTYPE_HOSTDEAD: | |
262 | case IMPTYPE_HOSTUNREACH: | |
263 | if (hp) | |
264 | h_free(hp); /* won't work right */ | |
265 | break; | |
266 | ||
267 | /* | |
268 | * Error in data. Clear RFNM status for this host and send | |
269 | * noops to the IMP to clear the interface. | |
270 | */ | |
271 | case IMPTYPE_BADDATA: | |
272 | imperr(sc, "data error"); | |
273 | if (hp) | |
274 | hp->h_rfnm = 0; | |
275 | impnoops(sc); | |
276 | break; | |
277 | ||
278 | /* | |
a0b7c7fb | 279 | * Interface reset. |
6c73ade6 BJ |
280 | */ |
281 | case IMPTYPE_RESET: | |
a0b7c7fb SL |
282 | imperr(sc, "interface reset"); |
283 | sc->imp_state = IMPS_RESET; | |
284 | impnoops(sc); | |
6c73ade6 BJ |
285 | goto drop; |
286 | ||
287 | default: | |
288 | sc->imp_if.if_collisions++; /* XXX */ | |
289 | goto drop; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Queue on protocol's input queue. | |
294 | */ | |
295 | switch (ip->il_link) { | |
296 | ||
297 | #ifdef INET | |
298 | case IMPLINK_IP: | |
299 | m->m_len -= sizeof(struct imp_leader); | |
300 | m->m_off += sizeof(struct imp_leader); | |
301 | setipintr(); | |
302 | inq = &ipintrq; | |
303 | break; | |
304 | #endif | |
305 | ||
306 | default: | |
307 | impproto.sp_protocol = ip->il_link; | |
faad37c0 SL |
308 | impdst.sin_addr = sc->imp_if.if_addr; |
309 | impsrc.sin_addr.s_net = ip->il_network; | |
310 | impsrc.sin_addr.s_host = ip->il_host; | |
311 | impsrc.sin_addr.s_imp = ip->il_imp; | |
312 | raw_input(m, impproto, impdst, impsrc); | |
6c73ade6 BJ |
313 | return; |
314 | } | |
315 | IF_ENQUEUE(inq, m); | |
316 | return; | |
317 | ||
318 | drop: | |
319 | m_freem(m); | |
320 | } | |
321 | ||
a0b7c7fb SL |
322 | /* |
323 | * Bring the IMP down after notification. | |
324 | */ | |
325 | impdown(sc) | |
326 | struct imp_softc *sc; | |
327 | { | |
328 | sc->imp_state = IMPS_DOWN; | |
329 | /* notify protocols with messages waiting? */ | |
330 | } | |
331 | ||
6c73ade6 BJ |
332 | /*VARARGS*/ |
333 | imperr(sc, fmt, a1, a2) | |
334 | struct imp_softc *sc; | |
335 | char *fmt; | |
336 | { | |
337 | printf("imp%d: ", sc->imp_if.if_unit); | |
338 | printf(fmt, a1, a2); | |
339 | printf("\n"); | |
340 | } | |
341 | ||
342 | /* | |
343 | * ARPAnet 1822 output routine. | |
344 | * Called from higher level protocol routines to set up messages for | |
345 | * transmission to the imp. Sets up the header and calls impsnd to | |
346 | * enqueue the message for this IMP's hardware driver. | |
347 | */ | |
348 | impoutput(ifp, m0, pf) | |
349 | register struct ifnet *ifp; | |
350 | struct mbuf *m0; | |
351 | { | |
352 | register struct imp_leader *imp; | |
353 | register struct mbuf *m = m0; | |
354 | int x, dhost, dimp, dlink, len; | |
355 | ||
356 | /* | |
357 | * Don't even try if the IMP is unavailable. | |
358 | */ | |
a0b7c7fb SL |
359 | x = imp_softc[ifp->if_unit].imp_state; |
360 | if (x == IMPS_DOWN || x == IMPS_GOINGDOWN) | |
361 | goto drop; | |
6c73ade6 BJ |
362 | |
363 | switch (pf) { | |
364 | ||
365 | #ifdef INET | |
366 | case PF_INET: { | |
367 | register struct ip *ip = mtod(m0, struct ip *); | |
368 | ||
369 | dhost = ip->ip_dst.s_host; | |
370 | dimp = ip->ip_dst.s_imp; | |
371 | dlink = IMPLINK_IP; | |
372 | len = ntohs(ip->ip_len); | |
373 | break; | |
374 | } | |
375 | #endif | |
376 | case PF_IMPLINK: | |
377 | goto leaderexists; | |
378 | ||
379 | default: | |
380 | printf("imp%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
a0b7c7fb | 381 | goto drop; |
6c73ade6 BJ |
382 | } |
383 | ||
384 | /* | |
385 | * Add IMP leader. If there's not enough space in the | |
386 | * first mbuf, allocate another. If that should fail, we | |
387 | * drop this sucker. | |
388 | */ | |
389 | if (m->m_off > MMAXOFF || | |
390 | MMINOFF + sizeof(struct imp_leader) > m->m_off) { | |
391 | m = m_get(M_DONTWAIT); | |
a0b7c7fb SL |
392 | if (m == 0) |
393 | goto drop; | |
6c73ade6 BJ |
394 | m->m_next = m0; |
395 | m->m_off = MMINOFF; | |
396 | m->m_len = sizeof(struct imp_leader); | |
397 | } else { | |
398 | m->m_off -= sizeof(struct imp_leader); | |
399 | m->m_len += sizeof(struct imp_leader); | |
400 | } | |
401 | imp = mtod(m, struct imp_leader *); | |
402 | imp->il_format = IMP_NFF; | |
403 | imp->il_host = dhost; | |
404 | imp->il_impno = dimp; | |
405 | imp->il_length = (len + sizeof(struct imp_leader)) << 3; | |
406 | imp->il_link = dlink; | |
407 | ||
408 | leaderexists: | |
409 | /* | |
410 | * Hand message to impsnd to perform RFNM counting | |
411 | * and eventual transmission. | |
412 | */ | |
413 | return (impsnd(ifp, m)); | |
a0b7c7fb SL |
414 | drop: |
415 | m_freem(m0); | |
416 | return (0); | |
6c73ade6 BJ |
417 | } |
418 | ||
419 | /* | |
420 | * Put a message on an interface's output queue. | |
421 | * Perform RFNM counting: no more than 8 message may be | |
422 | * in flight to any one host. | |
423 | */ | |
424 | impsnd(ifp, m) | |
425 | struct ifnet *ifp; | |
426 | struct mbuf *m; | |
427 | { | |
428 | register struct imp_leader *ip; | |
429 | register struct host *hp; | |
430 | struct impcb *icp; | |
431 | int x; | |
432 | ||
433 | ip = mtod(m, struct imp_leader *); | |
434 | ||
435 | /* | |
436 | * Do RFNM counting for data messages | |
437 | * (no more than 8 outstanding to any host) | |
438 | */ | |
439 | if (ip->il_mtype == IMPTYPE_DATA) { | |
440 | struct in_addr addr; | |
441 | ||
442 | addr.s_net = ifp->if_net; | |
443 | addr.s_host = ip->il_host; | |
444 | addr.s_imp = ip->il_imp; | |
445 | hp = h_enter(addr); | |
446 | ||
447 | /* | |
a0b7c7fb | 448 | * If IMP would block, queue until RFNM |
6c73ade6 BJ |
449 | */ |
450 | if (hp) { | |
451 | register struct mbuf *n; | |
452 | int cnt; | |
453 | ||
454 | if (hp->h_rfnm < 8) { | |
455 | hp->h_rfnm++; | |
456 | goto enque; | |
457 | } | |
458 | /* | |
459 | * Keeping the count in the host structure | |
460 | * causes the packing scheme to lose too much. | |
461 | */ | |
462 | cnt = 0, n = hp->h_q; | |
463 | for (; n != (struct mbuf *)hp; n = n->m_act) | |
464 | cnt++; | |
465 | if (cnt >= 8) | |
466 | goto drop; | |
a0b7c7fb SL |
467 | |
468 | /* | |
469 | * Q is kept as circulare list with h_q | |
470 | * (head) pointing to the last entry. | |
471 | */ | |
6c73ade6 BJ |
472 | if ((n = hp->h_q) == 0) |
473 | hp->h_q = m->m_act = m; | |
474 | else { | |
475 | m->m_act = n->m_act; | |
476 | hp->h_q = n->m_act = m; | |
477 | } | |
478 | goto start; | |
479 | } | |
480 | drop: | |
481 | m_freem(m); | |
482 | return (0); | |
483 | } | |
484 | enque: | |
485 | x = splimp(); | |
486 | IF_ENQUEUE(&ifp->if_snd, m); | |
487 | splx(x); | |
488 | ||
489 | start: | |
490 | icp = &imp_softc[ifp->if_unit].imp_cb; | |
491 | if (icp->ic_oactive == 0) | |
492 | (*icp->ic_start)(ifp->if_unit); | |
493 | return (1); | |
494 | } | |
495 | ||
496 | /* | |
497 | * Put three 1822 NOOPs at the head of the output queue. | |
498 | * Part of host-IMP initialization procedure. | |
499 | * (Should return success/failure, but noone knows | |
500 | * what to do with this, so why bother?) | |
501 | */ | |
502 | impnoops(sc) | |
503 | register struct imp_softc *sc; | |
504 | { | |
505 | register i; | |
506 | register struct mbuf *m; | |
507 | register struct imp_leader *ip; | |
508 | int x; | |
509 | ||
510 | sc->imp_state = IMPS_INIT; | |
511 | sc->imp_dropcnt = IMP_DROPCNT; | |
512 | for (i = 0; i < IMP_DROPCNT; i++ ) { | |
513 | if ((m = m_getclr(M_DONTWAIT)) == 0) | |
514 | return; | |
515 | m->m_off = MMINOFF; | |
516 | m->m_len = sizeof(struct imp_leader); | |
517 | ip = mtod(m, struct imp_leader *); | |
518 | ip->il_format = IMP_NFF; | |
519 | ip->il_link = i; | |
520 | ip->il_mtype = IMPTYPE_NOOP; | |
521 | x = splimp(); | |
522 | IF_PREPEND(&sc->imp_if.if_snd, m); | |
523 | splx(x); | |
524 | } | |
525 | if (sc->imp_cb.ic_oactive == 0) | |
526 | (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); | |
527 | } | |
528 | #endif |