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f04c49fa KS |
1 | /*********************************************************** |
2 | Copyright IBM Corporation 1987 | |
3 | ||
4 | All Rights Reserved | |
5 | ||
6 | Permission to use, copy, modify, and distribute this software and its | |
7 | documentation for any purpose and without fee is hereby granted, | |
8 | provided that the above copyright notice appear in all copies and that | |
9 | both that copyright notice and this permission notice appear in | |
10 | supporting documentation, and that the name of IBM not be | |
11 | used in advertising or publicity pertaining to distribution of the | |
12 | software without specific, written prior permission. | |
13 | ||
14 | IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING | |
15 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL | |
16 | IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR | |
17 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, | |
18 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
19 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
20 | SOFTWARE. | |
21 | ||
22 | ******************************************************************/ | |
23 | ||
24 | /* | |
25 | * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison | |
26 | */ | |
27 | /* | |
28 | * ARGO TP | |
29 | * | |
30 | * $Header: tp_emit.c,v 5.5 88/11/18 17:27:20 nhall Exp $ | |
31 | * $Source: /usr/argo/sys/netiso/RCS/tp_emit.c,v $ | |
620f4252 | 32 | * @(#)tp_emit.c 7.4 (Berkeley) %G% * |
f04c49fa KS |
33 | * |
34 | * This file contains tp_emit() and tp_error_emit(), which | |
35 | * form TPDUs and hand them to ip. | |
36 | * They take data in the form of mbuf chain, allocate mbufs as | |
37 | * necessary for headers, and set the fields as appropriate from | |
38 | * information found in the tpcb and net-level pcb. | |
39 | * | |
40 | * The worst thing about this code is adding the variable-length | |
41 | * options on a machine that requires alignment for any memory access | |
42 | * that isn't of size 1. See the macro ADDOPTION() below. | |
43 | * | |
44 | * We don't do any concatenation. (There's a kludge to test the | |
45 | * basic mechanism of separation under the 'w' tpdebug option, that's all.) | |
46 | */ | |
47 | ||
48 | #ifndef lint | |
49 | static char *rcsid = "$Header: tp_emit.c,v 5.5 88/11/18 17:27:20 nhall Exp $"; | |
50 | #endif lint | |
51 | ||
52 | ||
53 | #include "argoxtwentyfive.h" | |
54 | #include "param.h" | |
55 | #include "mbuf.h" | |
56 | #include "socket.h" | |
57 | #include "socketvar.h" | |
58 | #include "protosw.h" | |
59 | #include "errno.h" | |
60 | #include "types.h" | |
61 | #include "time.h" | |
a50e2bc0 KS |
62 | #include "iso.h" |
63 | #include "argo_debug.h" | |
64 | #include "tp_timer.h" | |
65 | #include "tp_param.h" | |
66 | #include "tp_stat.h" | |
67 | #include "tp_pcb.h" | |
68 | #include "tp_tpdu.h" | |
69 | #include "tp_trace.h" | |
70 | #include "tp_meas.h" | |
71 | #include "tp_seq.h" | |
72 | #include "iso_errno.h" | |
f04c49fa KS |
73 | |
74 | void iso_gen_csum(); | |
75 | ||
76 | ||
77 | /* Here is a mighty kludge. The token ring misorders packets if you | |
78 | * fire them at it too fast, and TP sans checksum is "too fast", so | |
79 | * we have introduced a delay when checksumming isn't used. | |
80 | */ | |
81 | char tp_delay = 0x00; /* delay to keep token ring from blowing it */ | |
82 | ||
83 | /* | |
84 | * NAME: tp_emit() | |
85 | * | |
86 | * CALLED FROM: tp.trans and from tp_sbsend() | |
87 | * | |
88 | * FUNCTION and ARGUMENTS: | |
89 | * Emits one tpdu of the type (dutype), of the format appropriate | |
90 | * to the connection described by the pcb (tpcb), with sequence | |
91 | * number (seq) (where appropriate), end-of-tsdu bit (eot) where | |
92 | * appropriate, and with the data in the mbuf chain (data). | |
93 | * For DR and ER tpdus, the argument (eot) is | |
94 | * the reason for issuing the tpdu rather than an end-of-tsdu indicator. | |
95 | * | |
96 | * RETURNS: | |
97 | * 0 OK | |
98 | * ENOBUFS | |
99 | * E* returned from net layer output rtn | |
100 | * | |
101 | * SIDE EFFECTS: | |
102 | * | |
103 | * NOTES: | |
104 | * | |
105 | * WE ASSUME that the tp header + all options will fit in ONE mbuf. | |
106 | * If mbufs are 256 this will most likely be true, but if they are 128 it's | |
107 | * possible that they won't. | |
108 | * If you used every option on the CR + max. user data you'd overrun | |
109 | * 112 but unless you used > 115 bytes for the security | |
110 | * parameter, it would fit in a 256-byte mbuf (240 bytes for the header) | |
111 | * We don't support the security parameter, so this isn't a problem. | |
112 | * If security is added, we ought to remove this assumption. | |
113 | * | |
114 | * We do not implement the flow control confirmation "element of procedure". | |
115 | * A) it should not affect interoperability, | |
116 | * B) it should not be necessary - the protocol will eventually | |
117 | * straighten things out w/o FCC, as long as we don't have severely | |
118 | * mismatched keepalive and inactivity timers, and | |
119 | * C) it appears not to be REQUIRED, and | |
120 | * D) it's incredibly grotesque, and no doubt will lengthen a few | |
121 | * critical paths. | |
122 | * HOWEVER, we're thinking about putting it in anyway, for | |
123 | * completeness, just like we did with ack subsequencing. | |
124 | */ | |
125 | ||
126 | int | |
127 | tp_emit(dutype, tpcb, seq, eot, data) | |
128 | int dutype; | |
129 | struct tp_pcb *tpcb; | |
130 | SeqNum seq; | |
131 | u_int eot; | |
132 | struct mbuf *data; | |
133 | { | |
134 | register struct tpdu *hdr; | |
135 | register struct mbuf *m; | |
136 | int csum_offset=0; | |
137 | int datalen = 0; | |
138 | int error = 0; | |
139 | ||
140 | /* NOTE: | |
141 | * here we treat tpdu_li as if it DID include the li field, up until | |
142 | * the end, at which time we subtract 1 | |
143 | * THis is because if we subtract 1 right away, we end up adding | |
144 | * one every time we add an option. | |
145 | */ | |
146 | IFDEBUG(D_EMIT) | |
147 | printf( | |
a50e2bc0 KS |
148 | "tp_emit dutype 0x%x, tpcb 0x%x, eot 0x%x, seq 0x%x, data 0x%x", |
149 | dutype, tpcb, eot, seq, data); | |
f04c49fa KS |
150 | ENDDEBUG |
151 | ||
a50e2bc0 KS |
152 | if (dutype == CR_TPDU || dutype == CC_TPDU) { |
153 | m = (struct mbuf *) malloc((u_long)256, M_MBUF, M_DONTWAIT); | |
154 | if (m) { | |
155 | m->m_type = TPMT_TPHDR; | |
156 | mbstat.m_mtypes[TPMT_TPHDR]++; | |
157 | m->m_next = MNULL; | |
158 | m->m_data = m->m_dat; | |
159 | m->m_flags = 0; | |
160 | } | |
161 | } else { | |
162 | MGET(m, M_DONTWAIT, TPMT_TPHDR); | |
163 | } | |
f04c49fa KS |
164 | if (m == NULL) { |
165 | if(data != (struct mbuf *)0) | |
166 | m_freem(data); | |
167 | error = ENOBUFS; | |
168 | goto done; | |
169 | } | |
170 | m->m_len = sizeof(struct tpdu); | |
171 | m->m_act = MNULL; | |
172 | ||
173 | hdr = mtod(m, struct tpdu *); | |
a50e2bc0 | 174 | bzero((caddr_t)hdr, sizeof(struct tpdu)); |
f04c49fa KS |
175 | |
176 | { | |
177 | int tp_headersize(); | |
178 | ||
179 | hdr->tpdu_type = dutype; | |
180 | hdr->tpdu_li = tp_headersize(dutype, tpcb); | |
181 | /* | |
182 | * class 0 doesn't use this for DT | |
183 | * it'll just get overwritten below | |
184 | */ | |
185 | hdr->tpdu_dref = htons(tpcb->tp_fref); | |
186 | if( tpcb->tp_use_checksum || | |
187 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4) )) { | |
188 | csum_offset = hdr->tpdu_li + 2; /* DOESN'T include csum */ | |
189 | ADDOPTION(TPP_checksum, hdr, 2, eot /* dummy arg */); | |
190 | IFDEBUG(D_CHKSUM) | |
191 | printf( | |
192 | "tp_emit: csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
193 | csum_offset, hdr->tpdu_li); | |
194 | ENDDEBUG | |
195 | } | |
196 | /* | |
197 | * VARIABLE PARTS... | |
198 | */ | |
199 | switch( dutype ) { | |
200 | ||
201 | case CR_TPDU_type: | |
202 | hdr->tpdu_CRdref_0 = htons(0); /* must be zero */ | |
620f4252 KS |
203 | if (!tpcb->tp_cebit_off) { |
204 | tpcb->tp_win_recv = tp_start_win << 8; | |
205 | LOCAL_CREDIT(tpcb); | |
206 | CONG_INIT_SAMPLE(tpcb); | |
207 | tpcb->tp_ackrcvd = 0; | |
208 | } | |
209 | else | |
210 | LOCAL_CREDIT(tpcb); | |
211 | ||
f04c49fa KS |
212 | |
213 | case CC_TPDU_type: | |
214 | { | |
215 | u_char x; | |
216 | ||
217 | hdr->tpdu_CCsref = htons(tpcb->tp_lref); /* same as CRsref */ | |
218 | ||
219 | if( tpcb->tp_class > TP_CLASS_1 ) { | |
620f4252 KS |
220 | /* ifdef CE_BIT, we did this in tp_input when the CR came in */ |
221 | if (tpcb->tp_cebit_off) | |
222 | LOCAL_CREDIT( tpcb ); | |
f04c49fa KS |
223 | tpcb->tp_sent_uwe = tpcb->tp_lcredit -1; |
224 | tpcb->tp_sent_rcvnxt = 1; | |
225 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; | |
226 | hdr->tpdu_cdt = tpcb->tp_lcredit; | |
227 | } else { | |
228 | hdr->tpdu_cdt = 0; | |
229 | } | |
230 | hdr->tpdu_CCclass = tp_mask_to_num(tpcb->tp_class); | |
231 | hdr->tpdu_CCoptions = | |
232 | (tpcb->tp_xtd_format? TPO_XTD_FMT:0) | | |
233 | (tpcb->tp_use_efc? TPO_USE_EFC:0); | |
234 | ||
235 | IFPERF(tpcb) | |
236 | u_char perf_meas = tpcb->tp_perf_on; | |
237 | ADDOPTION(TPP_perf_meas, hdr, sizeof(perf_meas), perf_meas); | |
238 | ENDPERF | |
239 | ||
240 | if( dutype == CR_TPDU_type ) { | |
241 | IncStat(ts_CR_sent); | |
242 | ||
243 | ASSERT( tpcb->tp_lsuffixlen > 0 ); | |
244 | ASSERT( tpcb->tp_fsuffixlen > 0 ); | |
245 | ||
246 | ADDOPTION(TPP_calling_sufx, hdr, | |
a50e2bc0 | 247 | tpcb->tp_lsuffixlen, tpcb->tp_lsuffix[0]); |
f04c49fa | 248 | ADDOPTION(TPP_called_sufx, hdr, |
a50e2bc0 | 249 | tpcb->tp_fsuffixlen, tpcb->tp_fsuffix[0]); |
f04c49fa KS |
250 | } else { |
251 | IncStat(ts_CC_sent); | |
252 | } | |
253 | ||
254 | ADDOPTION(TPP_tpdu_size, hdr, | |
255 | sizeof(tpcb->tp_tpdusize), tpcb->tp_tpdusize); | |
256 | ||
257 | if (tpcb->tp_class != TP_CLASS_0) { | |
258 | short millisec = 500*(tpcb->tp_sendack_ticks); | |
259 | ||
260 | millisec = htons(millisec); | |
261 | ADDOPTION(TPP_acktime, hdr, sizeof(short), millisec); | |
262 | ||
263 | x = (tpcb->tp_use_nxpd? TPAO_USE_NXPD: 0) | |
264 | | (tpcb->tp_use_rcc? TPAO_USE_RCC : 0) | |
265 | | (tpcb->tp_use_checksum?0: TPAO_NO_CSUM) | |
266 | | (tpcb->tp_xpd_service? TPAO_USE_TXPD: 0); | |
267 | ADDOPTION(TPP_addl_opt, hdr, 1, x); | |
268 | ||
269 | } | |
270 | ||
271 | if( (dutype == CR_TPDU_type) && (tpcb->tp_class != TP_CLASS_0)){ | |
272 | ||
273 | ASSERT( 1 == sizeof(tpcb->tp_vers) ); | |
274 | ADDOPTION(TPP_vers, hdr, 1, tpcb->tp_vers); | |
275 | ||
276 | /* for each alt protocol class x, | |
277 | * x = x<<4; | |
278 | * option = concat(option, x); | |
279 | * Well, for now we only have TP0 for an | |
280 | * alternative so... this is easy. | |
281 | * | |
282 | * HOWEVER... There should be NO alt protocol | |
283 | * class over CLNS. Need to see if the route suggests | |
284 | * CONS, and iff so add alt class. | |
285 | */ | |
286 | x = 0; | |
287 | ADDOPTION(TPP_alt_class, hdr, 1, x); | |
288 | } | |
289 | ||
290 | if( hdr->tpdu_li > MLEN) | |
291 | panic("tp_emit CR/CC"); | |
292 | } | |
293 | break; | |
294 | ||
295 | case DR_TPDU_type: | |
296 | if( hdr->tpdu_DRdref == 0 ) { | |
297 | /* don't issue the DR */ | |
298 | goto done; | |
299 | } | |
300 | hdr->tpdu_cdt = 0; | |
301 | hdr->tpdu_DRsref = htons(tpcb->tp_lref); | |
302 | hdr->tpdu_DRreason = (u_char)eot; /* WHICH BYTE OF THIS??? */ | |
303 | ||
304 | /* forget the add'l information variable part */ | |
305 | IncStat(ts_DR_sent); | |
306 | break; | |
307 | ||
308 | case DC_TPDU_type: /* not used in class 0 */ | |
309 | ASSERT( tpcb->tp_class != TP_CLASS_0); | |
310 | hdr->tpdu_DCsref = htons(tpcb->tp_lref); | |
311 | hdr->tpdu_cdt = 0; | |
312 | data = (struct mbuf *)0; | |
313 | IncStat(ts_DC_sent); | |
314 | break; | |
315 | ||
316 | case XAK_TPDU_type: /* xak not used in class 0 */ | |
317 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ | |
318 | hdr->tpdu_cdt = 0; | |
319 | ||
320 | IFTRACE(D_XPD) | |
321 | tptraceTPCB(TPPTXack, seq, 0, 0, 0, 0); | |
322 | ENDTRACE | |
323 | data = (struct mbuf *)0; | |
324 | if (tpcb->tp_xtd_format) { | |
325 | #ifdef BYTE_ORDER | |
326 | hdr->tpdu_XAKseqX = htonl(seq); | |
327 | #else | |
328 | hdr->tpdu_XAKseqX = seq; | |
329 | #endif BYTE_ORDER | |
330 | } else { | |
331 | hdr->tpdu_XAKseq = seq; | |
332 | } | |
333 | IncStat(ts_XAK_sent); | |
334 | IncPStat(tpcb, tps_XAK_sent); | |
335 | break; | |
336 | ||
337 | case XPD_TPDU_type: /* xpd not used in class 0 */ | |
338 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ | |
339 | hdr->tpdu_cdt = 0; | |
340 | if (tpcb->tp_xtd_format) { | |
341 | #ifdef BYTE_ORDER | |
342 | union seq_type seqeotX; | |
343 | ||
344 | seqeotX.s_seq = seq; | |
345 | seqeotX.s_eot = 1; | |
346 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
347 | #else | |
348 | hdr->tpdu_XPDseqX = seq; | |
349 | hdr->tpdu_XPDeotX = 1; /* always 1 for XPD tpdu */ | |
350 | #endif BYTE_ORDER | |
351 | } else { | |
352 | hdr->tpdu_XPDseq = seq; | |
353 | hdr->tpdu_XPDeot = 1; /* always 1 for XPD tpdu */ | |
354 | } | |
355 | IncStat(ts_XPD_sent); | |
356 | IncPStat(tpcb, tps_XPD_sent); | |
357 | ||
358 | /* kludge to test the input size checking */ | |
359 | IFDEBUG(D_SIZE_CHECK) | |
a50e2bc0 | 360 | /*if(data->m_len <= 16 && data->m_off < (MLEN-18) ) { |
f04c49fa KS |
361 | printf("Sending too much data on XPD: 18 bytes\n"); |
362 | data->m_len = 18; | |
a50e2bc0 | 363 | }*/ |
f04c49fa KS |
364 | ENDDEBUG |
365 | break; | |
366 | ||
367 | case DT_TPDU_type: | |
368 | hdr->tpdu_cdt = 0; | |
369 | IFTRACE(D_DATA) | |
370 | tptraceTPCB(TPPTmisc, "emit DT: eot seq tpdu_li", eot, seq, | |
371 | hdr->tpdu_li, 0); | |
372 | ENDTRACE | |
373 | if (tpcb->tp_xtd_format) { | |
374 | #ifdef BYTE_ORDER | |
375 | union seq_type seqeotX; | |
376 | ||
377 | seqeotX.s_seq = seq; | |
378 | seqeotX.s_eot = eot; | |
379 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
380 | #else | |
381 | hdr->tpdu_DTseqX = seq; | |
382 | hdr->tpdu_DTeotX = eot; | |
383 | #endif BYTE_ORDER | |
384 | } else if (tpcb->tp_class == TP_CLASS_0) { | |
385 | IFDEBUG(D_EMIT) | |
386 | printf("DT tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); | |
387 | dump_buf( hdr, hdr->tpdu_li + 1 ); | |
388 | ENDDEBUG | |
389 | ((struct tp0du *)hdr)->tp0du_eot = eot; | |
390 | ((struct tp0du *)hdr)->tp0du_mbz = 0; | |
391 | IFDEBUG(D_EMIT) | |
392 | printf("DT 2 tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); | |
393 | dump_buf( hdr, hdr->tpdu_li + 1 ); | |
394 | ENDDEBUG | |
395 | } else { | |
396 | hdr->tpdu_DTseq = seq; | |
397 | hdr->tpdu_DTeot = eot; | |
398 | } | |
399 | if(eot) { | |
400 | IncStat(ts_EOT_sent); | |
401 | } | |
402 | IncStat(ts_DT_sent); | |
403 | IncPStat(tpcb, tps_DT_sent); | |
404 | break; | |
405 | ||
406 | case AK_TPDU_type:/* ak not used in class 0 */ | |
407 | ASSERT( tpcb->tp_class != TP_CLASS_0); | |
408 | data = (struct mbuf *)0; | |
409 | { SeqNum olduwe = tpcb->tp_sent_uwe; | |
410 | ||
411 | tpcb->tp_sent_uwe = | |
412 | SEQ(tpcb,tpcb->tp_rcvnxt + tpcb->tp_lcredit -1); | |
413 | LOCAL_CREDIT( tpcb ); | |
414 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; | |
415 | ||
416 | IFDEBUG(D_RENEG) | |
417 | /* occasionally fake a reneging so | |
418 | you can test subsequencing */ | |
419 | if( olduwe & 0x1 ) { | |
420 | tpcb->tp_reneged = 1; | |
421 | IncStat(ts_ldebug); | |
422 | } | |
423 | ENDDEBUG | |
424 | /* Are we about to reneg on credit? | |
425 | * When might we do so? | |
426 | * a) when using optimistic credit (which we no longer do). | |
427 | * b) when drain() gets implemented (not in the plans). | |
428 | * c) when D_RENEG is on. | |
a50e2bc0 | 429 | * d) when DEC BIT response is implemented. |
f04c49fa KS |
430 | * (not- when we do this, we'll need to implement flow control |
431 | * confirmation) | |
432 | */ | |
433 | if( SEQ_LT(tpcb, tpcb->tp_sent_uwe, olduwe) ) { | |
434 | tpcb->tp_reneged = 1; | |
435 | IncStat(ts_lcdt_reduced); | |
436 | IFTRACE(D_CREDIT) | |
437 | tptraceTPCB(TPPTmisc, | |
438 | "RENEG: olduwe newuwe lcredit rcvnxt", | |
439 | olduwe, | |
440 | tpcb->tp_sent_uwe, tpcb->tp_lcredit, | |
441 | tpcb->tp_rcvnxt); | |
442 | ENDTRACE | |
443 | } | |
444 | ||
445 | IFPERF(tpcb) | |
446 | /* new lwe is less than old uwe means we're | |
447 | * acking before we received a whole window full | |
448 | */ | |
449 | if( SEQ_LT( tpcb, tpcb->tp_rcvnxt, olduwe) ) { | |
450 | /* tmp1 = number of pkts fewer than the full window */ | |
451 | register int tmp1 = | |
452 | (int) SEQ_SUB( tpcb, olduwe, tpcb->tp_rcvnxt); | |
453 | ||
454 | if(tmp1 > TP_PM_MAX) | |
455 | tmp1 = TP_PM_MAX; | |
456 | IncPStat( tpcb, tps_ack_early[tmp1] ); | |
457 | ||
458 | /* tmp1 = amt of new cdt we're advertising */ | |
459 | tmp1 = SEQ_SUB( tpcb, seq, tpcb->tp_sent_rcvnxt); | |
460 | if(tmp1 > TP_PM_MAX ) | |
461 | tmp1 = TP_PM_MAX; | |
462 | ||
463 | IncPStat( tpcb, | |
464 | tps_cdt_acked [ tmp1 ] | |
465 | [ ((tpcb->tp_lcredit > TP_PM_MAX)? | |
466 | TP_PM_MAX:tpcb->tp_lcredit) ] ); | |
467 | ||
468 | } | |
469 | ENDPERF | |
470 | } | |
471 | IFTRACE(D_ACKSEND) | |
472 | tptraceTPCB(TPPTack, seq, tpcb->tp_lcredit, tpcb->tp_sent_uwe, | |
473 | tpcb->tp_r_subseq, 0); | |
474 | ENDTRACE | |
475 | if (tpcb->tp_xtd_format) { | |
476 | #ifdef BYTE_ORDER | |
477 | hdr->tpdu_cdt = 0; | |
478 | hdr->tpdu_AKseqX = htonl(seq); | |
479 | hdr->tpdu_AKcdtX = htons(tpcb->tp_lcredit); | |
480 | #else | |
481 | hdr->tpdu_cdt = 0; | |
482 | hdr->tpdu_AKseqX = seq; | |
483 | hdr->tpdu_AKcdtX = tpcb->tp_lcredit; | |
484 | #endif BYTE_ORDER | |
485 | } else { | |
486 | hdr->tpdu_AKseq = seq; | |
487 | hdr->tpdu_AKcdt = tpcb->tp_lcredit; | |
488 | } | |
489 | if ((tpcb->tp_class == TP_CLASS_4) && tpcb->tp_reneged ) { | |
490 | /* | |
491 | * Ack subsequence parameter req'd if WE reneged on | |
492 | * credit offered. (ISO 8073, 12.2.3.8.2, p. 74) | |
493 | */ | |
494 | IFDEBUG(D_RENEG) | |
495 | printf("Adding subseq 0x%x\n", tpcb->tp_s_subseq); | |
496 | ENDDEBUG | |
497 | tpcb->tp_s_subseq++; | |
498 | /* | |
499 | * add tmp subseq and do a htons on it. | |
500 | */ | |
501 | ADDOPTION(TPP_subseq, hdr, | |
502 | sizeof(tpcb->tp_s_subseq), tpcb->tp_s_subseq); | |
503 | } else | |
504 | tpcb->tp_s_subseq = 0; | |
505 | ||
506 | if ( tpcb->tp_sendfcc || eot ) /* overloaded to mean SEND FCC */ { | |
507 | /* | |
508 | * Rules for sending FCC ("should" send when) : | |
509 | * %a) received an ack from peer with NO NEWS whatsoever, | |
510 | * and it did not contain an FCC | |
511 | * b) received an ack from peer that opens its closed window. | |
512 | * c) received an ack from peer after it reneged on its | |
513 | * offered credit, AND this ack raises UWE but LWE is same | |
514 | * and below UWE at time of reneging (reduction) | |
515 | * Now, ISO 8073 12.2.3.8.3 says | |
516 | * that a retransmitted AK shall not contain the FCC | |
517 | * parameter. Now, how the hell you tell the difference | |
518 | * between a retransmitted ack and an ack that's sent in | |
519 | * response to a received ack, I don't know, because without | |
520 | * any local activity, and w/o any received DTs, they | |
521 | * will contain exactly the same credit/seq# information. | |
522 | * Anyway, given that the "retransmission of acks" | |
523 | * procedure (ISO 8073 12.2.3.8.3) is optional, and we | |
524 | * don't do it (although the peer can't tell that), we | |
525 | * ignore this last rule. | |
526 | * | |
527 | * We send FCC for reasons a) and b) only. | |
528 | * To add reason c) would require a ridiculous amount of state. | |
529 | * | |
530 | */ | |
531 | u_short bogus[4]; /* lwe(32), subseq(16), cdt(16) */ | |
532 | SeqNum lwe; | |
533 | u_short subseq, fcredit; | |
534 | ||
535 | tpcb->tp_sendfcc = 0; | |
536 | ||
537 | lwe = (SeqNum) htonl(tpcb->tp_snduna); | |
538 | subseq = htons(tpcb->tp_r_subseq); | |
539 | fcredit = htons(tpcb->tp_fcredit); | |
540 | ||
a50e2bc0 KS |
541 | bcopy((caddr_t) &lwe, (caddr_t)&bogus[0], sizeof(SeqNum)); |
542 | bcopy((caddr_t) &subseq, (caddr_t)&bogus[2], sizeof(u_short)); | |
543 | bcopy((caddr_t) &fcredit, (caddr_t)&bogus[3], sizeof(u_short)); | |
f04c49fa KS |
544 | |
545 | IFTRACE(D_ACKSEND) | |
546 | tptraceTPCB(TPPTmisc, | |
547 | "emit w/FCC: snduna r_subseq fcredit", | |
548 | tpcb->tp_snduna, tpcb->tp_r_subseq, | |
549 | tpcb->tp_fcredit, 0); | |
550 | ENDTRACE | |
551 | ||
552 | IFDEBUG(D_ACKSEND) | |
553 | printf("Calling ADDOPTION 0x%x, 0x%x, 0x%x,0x%x\n", | |
554 | TPP_flow_cntl_conf, | |
555 | hdr, sizeof(bogus), bogus[0]); | |
556 | ENDDEBUG | |
557 | ADDOPTION(TPP_flow_cntl_conf, hdr, sizeof(bogus), bogus[0]); | |
558 | IFDEBUG(D_ACKSEND) | |
559 | printf("after ADDOPTION hdr 0x%x hdr->tpdu_li 0x%x\n", | |
560 | hdr, hdr->tpdu_li); | |
561 | printf( | |
562 | "after ADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
563 | csum_offset, hdr->tpdu_li); | |
564 | ENDDEBUG | |
565 | ||
566 | } | |
567 | tpcb->tp_reneged = 0; | |
568 | tpcb->tp_sent_rcvnxt = seq; | |
569 | tp_ctimeout(tpcb->tp_refp, TM_sendack, | |
570 | (int)tpcb->tp_keepalive_ticks); | |
571 | IncStat(ts_AK_sent); | |
572 | IncPStat(tpcb, tps_AK_sent); | |
573 | IFDEBUG(D_ACKSEND) | |
574 | printf( | |
575 | "2 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
576 | csum_offset, hdr->tpdu_li); | |
577 | ENDDEBUG | |
578 | break; | |
579 | ||
580 | case ER_TPDU_type: | |
581 | hdr->tpdu_ERreason = eot; | |
582 | hdr->tpdu_cdt = 0; | |
583 | /* no user data */ | |
584 | data = (struct mbuf *)0; | |
585 | IncStat(ts_ER_sent); | |
586 | break; | |
587 | } | |
588 | ||
589 | } | |
590 | ASSERT( ((int)hdr->tpdu_li > 0) && ((int)hdr->tpdu_li < MLEN) ); | |
591 | ||
592 | m->m_next = data; | |
593 | ||
a50e2bc0 | 594 | ASSERT( hdr->tpdu_li < MLEN ); /* leave this in */ |
f04c49fa KS |
595 | ASSERT( hdr->tpdu_li != 0 ); /* leave this in */ |
596 | ||
597 | m->m_len = hdr->tpdu_li ; | |
598 | hdr->tpdu_li --; /* doesn't include the li field */ | |
599 | ||
600 | datalen = m_datalen( m ); /* total len */ | |
601 | ||
602 | ASSERT( datalen <= tpcb->tp_l_tpdusize ); /* may become a problem | |
603 | when CLNP is used; leave in here for the time being */ | |
604 | IFDEBUG(D_ACKSEND) | |
605 | printf( | |
606 | "4 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
607 | csum_offset, hdr->tpdu_li); | |
608 | ENDDEBUG | |
609 | if( datalen > tpcb->tp_l_tpdusize ) { | |
610 | printf("data len 0x%x tpcb->tp_l_tpdusize 0x%x\n", | |
611 | datalen, tpcb->tp_l_tpdusize); | |
612 | } | |
613 | IFDEBUG(D_EMIT) | |
614 | printf( | |
615 | "tp_emit before gen_csum m_len 0x%x, csum_offset 0x%x, datalen 0x%x\n", | |
616 | m->m_len, csum_offset, datalen); | |
617 | ENDDEBUG | |
618 | if( tpcb->tp_use_checksum || | |
619 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4)) ) { | |
620 | iso_gen_csum(m, csum_offset, datalen); | |
621 | } | |
622 | ||
623 | IFDEBUG(D_EMIT) | |
624 | printf("tp_emit before tpxxx_output tpcb 0x%x, dutype 0x%x, datalen 0x%x\n", | |
625 | tpcb, dutype, datalen); | |
a50e2bc0 | 626 | dump_buf(mtod(m, caddr_t), datalen); |
f04c49fa KS |
627 | ENDDEBUG |
628 | ||
629 | IFPERF(tpcb) | |
630 | if( dutype == DT_TPDU_type ) { | |
631 | PStat(tpcb, Nb_to_ll) += (datalen - m->m_len); | |
a50e2bc0 | 632 | tpmeas( tpcb->tp_lref, TPtime_to_ll, (struct timeval *)0, |
f04c49fa KS |
633 | seq, PStat(tpcb, Nb_to_ll), (datalen - m->m_len)); |
634 | } | |
635 | ENDPERF | |
636 | ||
637 | IFTRACE(D_EMIT) | |
638 | tptraceTPCB(TPPTtpduout, dutype, hdr, hdr->tpdu_li+1, datalen, 0); | |
639 | ENDTRACE | |
640 | IFDEBUG(D_EMIT) | |
641 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", | |
642 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); | |
643 | ENDDEBUG | |
644 | ||
645 | { extern char tp_delay; | |
646 | ||
647 | if( tp_delay ) | |
648 | if( tpcb->tp_use_checksum == 0 ) { | |
649 | register u_int i = tp_delay; | |
650 | for (; i!= 0; i--) | |
651 | (void) iso_check_csum(m, datalen); | |
652 | } | |
653 | } | |
654 | ASSERT( m->m_len > 0 ); | |
655 | error = (tpcb->tp_nlproto->nlp_output)(tpcb->tp_npcb, m, datalen, | |
656 | !tpcb->tp_use_checksum); | |
657 | IFDEBUG(D_EMIT) | |
658 | printf("OUTPUT: returned 0x%x\n", error); | |
659 | ENDDEBUG | |
660 | IFTRACE(D_EMIT) | |
661 | tptraceTPCB(TPPTmisc, | |
662 | "tp_emit nlproto->output netservice returns datalen", | |
663 | tpcb->tp_nlproto->nlp_output, tpcb->tp_netservice, error, datalen); | |
664 | ENDTRACE | |
665 | done: | |
666 | if( error == E_CO_QFULL ) { | |
a50e2bc0 | 667 | tp_quench(tpcb, PRC_QUENCH); |
f04c49fa KS |
668 | return 0; |
669 | } | |
670 | return error; | |
671 | } | |
f04c49fa KS |
672 | /* |
673 | * NAME: tp_error_emit() | |
674 | * CALLED FROM: tp_input() when a DR or ER is to be issued in | |
675 | * response to an input error. | |
676 | * FUNCTION and ARGUMENTS: | |
677 | * The error type is the first argument. | |
678 | * The argument (sref) is the source reference on the bad incoming tpdu, | |
679 | * and is used for a destination reference on the outgoing packet. | |
680 | * (faddr) and (laddr) are the foreign and local addresses for this | |
681 | * connection. | |
682 | * (erdata) is a ptr to the errant incoming tpdu, and is copied into the | |
683 | * outgoing ER, if an ER is to be issued. | |
684 | * (erlen) is the number of octets of the errant tpdu that we should | |
685 | * try to copy. | |
686 | * (tpcb) is the pcb that describes the connection for which the bad tpdu | |
687 | * arrived. | |
688 | * RETURN VALUES: | |
689 | * 0 OK | |
690 | * ENOBUFS | |
691 | * E* from net layer datagram output routine | |
692 | * SIDE EFFECTS: | |
693 | * | |
694 | * NOTES: | |
695 | */ | |
696 | ||
697 | int | |
698 | tp_error_emit(error, sref, faddr, laddr, erdata, erlen, tpcb, cons_channel, | |
699 | dgout_routine) | |
700 | int error; | |
701 | u_long sref; | |
702 | struct sockaddr_iso *faddr, *laddr; | |
703 | struct mbuf *erdata; | |
704 | int erlen; | |
705 | struct tp_pcb *tpcb; | |
706 | int cons_channel; | |
707 | int (*dgout_routine)(); | |
708 | { | |
709 | int dutype; | |
710 | int datalen = 0; | |
711 | register struct tpdu *hdr; | |
712 | register struct mbuf *m; | |
713 | int csum_offset; | |
714 | ||
715 | IFTRACE(D_ERROR_EMIT) | |
716 | tptrace(TPPTmisc, "tp_error_emit error sref tpcb erlen", | |
717 | error, sref, tpcb, erlen); | |
718 | ENDTRACE | |
719 | IFDEBUG(D_ERROR_EMIT) | |
720 | printf( | |
721 | "tp_error_emit error 0x%x sref 0x%x tpcb 0x%x erlen 0x%x chan 0x%x\n", | |
722 | error, sref, tpcb, erlen, cons_channel); | |
723 | ENDDEBUG | |
724 | ||
725 | MGET(m, M_DONTWAIT, TPMT_TPHDR); | |
726 | if (m == NULL) { | |
727 | return ENOBUFS; | |
728 | } | |
729 | m->m_len = sizeof(struct tpdu); | |
730 | m->m_act = MNULL; | |
731 | ||
732 | hdr = mtod(m, struct tpdu *); | |
733 | ||
734 | IFDEBUG(D_ERROR_EMIT) | |
735 | printf("[error 0x%x] [error&0xff 0x%x] [(char)error 0x%x]\n", | |
736 | error, error&0xff, (char)error); | |
737 | ENDDEBUG | |
738 | ||
739 | error &= 0xff; | |
740 | ||
741 | if( error & 0x40 ) { | |
742 | error &= ~0x40; | |
743 | dutype = ER_TPDU_type; | |
744 | } else | |
745 | dutype = DR_TPDU_type; | |
746 | ||
747 | hdr->tpdu_type = dutype; | |
748 | hdr->tpdu_cdt = 0; | |
749 | ||
750 | switch( dutype ) { | |
751 | ||
752 | case DR_TPDU_type: | |
753 | IncStat(ts_DR_sent); | |
754 | hdr->tpdu_li = 7; | |
755 | hdr->tpdu_DRdref = htons(sref); | |
756 | hdr->tpdu_DRsref = htons(0); | |
757 | hdr->tpdu_DRreason = (char)error; | |
758 | IFDEBUG(D_ERROR_EMIT) | |
759 | printf("DR case:\n"); | |
760 | dump_buf( hdr, 7); | |
761 | ENDDEBUG | |
762 | /* forget the add'l information variable part */ | |
763 | break; | |
764 | ||
765 | case ER_TPDU_type: | |
766 | IncStat(ts_ER_sent); | |
767 | hdr->tpdu_li = 5; | |
768 | hdr->tpdu_ERreason = (char)error; | |
769 | break; | |
770 | ||
771 | default: | |
772 | ASSERT(0); | |
773 | printf("TP PANIC: bad dutype 0x%x\n", dutype); | |
774 | } | |
775 | ||
776 | if(tpcb) | |
777 | if( tpcb->tp_use_checksum ) { | |
778 | ADDOPTION(TPP_checksum, hdr, 2, csum_offset /* dummy argument */); | |
779 | csum_offset = hdr->tpdu_li - 2; | |
780 | } | |
781 | ||
a50e2bc0 | 782 | ASSERT( hdr->tpdu_li < MLEN ); |
f04c49fa KS |
783 | |
784 | if (dutype == ER_TPDU_type) { | |
785 | /* copy the errant tpdu into another 'variable part' */ | |
786 | register caddr_t P; | |
787 | ||
788 | IFTRACE(D_ERROR_EMIT) | |
789 | tptrace(TPPTmisc, "error_emit ER len tpduli", erlen, hdr->tpdu_li, | |
790 | 0,0); | |
791 | ENDTRACE | |
792 | IFDEBUG(D_ERROR_EMIT) | |
793 | printf("error_emit ER len 0x%x tpduli 0x%x\n", erlen, hdr->tpdu_li); | |
794 | ENDDEBUG | |
795 | ||
796 | /* copy at most as many octets for which you have room */ | |
797 | if (erlen + hdr->tpdu_li + 2 > TP_MAX_HEADER_LEN) | |
798 | erlen = TP_MAX_HEADER_LEN - hdr->tpdu_li - 2; | |
799 | ||
800 | /* add the "invalid tpdu" parameter : required in class 0 */ | |
801 | P = (caddr_t)hdr + (int)(hdr->tpdu_li); | |
802 | vbptr(P)->tpv_code = TPP_invalid_tpdu; /* parameter code */ | |
803 | vbptr(P)->tpv_len = erlen; /* parameter length */ | |
804 | m->m_len = hdr->tpdu_li + 2; /* 1 for code, 1 for length */ | |
805 | ||
806 | /* tp_input very likely handed us an mbuf chain w/ nothing in | |
807 | * the first mbuf and the data following the empty mbuf | |
808 | */ | |
809 | if(erdata->m_len == 0) { | |
810 | erdata = m_free(erdata); /* returns the next mbuf on the chain */ | |
811 | } | |
a50e2bc0 KS |
812 | /* |
813 | * copy only up to the bad octet | |
814 | * (or max that will fit in a header | |
815 | */ | |
816 | m->m_next = m_copy(erdata, 0, erlen); | |
f04c49fa KS |
817 | hdr->tpdu_li += erlen + 2; |
818 | m_freem(erdata); | |
819 | } else { | |
820 | IFDEBUG(D_ERROR_EMIT) | |
821 | printf("error_emit DR error tpduli 0x%x\n", error, hdr->tpdu_li); | |
822 | dump_buf( (char *)hdr, hdr->tpdu_li ); | |
823 | ENDDEBUG | |
824 | m->m_len = hdr->tpdu_li ; | |
825 | m_freem(erdata); | |
826 | } | |
827 | ||
828 | hdr->tpdu_li --; | |
829 | IFTRACE(D_ERROR_EMIT) | |
830 | tptrace(TPPTtpduout, 2, hdr, hdr->tpdu_li+1, 0, 0); | |
831 | ENDTRACE | |
832 | ||
833 | datalen = m_datalen( m); | |
834 | ||
835 | if(tpcb) { | |
836 | if( tpcb->tp_use_checksum ) { | |
837 | IFTRACE(D_ERROR_EMIT) | |
838 | tptrace(TPPTmisc, "before gen csum datalen", datalen,0,0,0); | |
839 | ENDTRACE | |
840 | IFDEBUG(D_ERROR_EMIT) | |
841 | printf("before gen csum datalen 0x%x, csum_offset 0x%x\n", | |
842 | datalen, csum_offset); | |
843 | ENDDEBUG | |
844 | ||
845 | iso_gen_csum(m, csum_offset, datalen); | |
846 | } | |
847 | ||
848 | IFDEBUG(D_ERROR_EMIT) | |
849 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", | |
850 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); | |
851 | ENDDEBUG | |
852 | /* Problem: if packet comes in on ISO but sock is listening | |
853 | * in INET, this assertion will fail. | |
854 | * Have to believe the argument, not the nlp_proto. | |
855 | ASSERT( tpcb->tp_nlproto->nlp_dgoutput == dgout_routine ); | |
856 | */ | |
857 | ||
858 | IFDEBUG(D_ERROR_EMIT) | |
859 | printf("tp_error_emit 1 sending DG: Laddr\n"); | |
a50e2bc0 | 860 | dump_addr((struct sockaddr *)laddr); |
f04c49fa | 861 | printf("Faddr\n"); |
a50e2bc0 | 862 | dump_addr((struct sockaddr *)faddr); |
f04c49fa KS |
863 | ENDDEBUG |
864 | return (tpcb->tp_nlproto->nlp_dgoutput)( | |
865 | &laddr->siso_addr, | |
866 | &faddr->siso_addr, | |
867 | m, datalen, | |
868 | /* no route */ (caddr_t)0, !tpcb->tp_use_checksum); | |
869 | } else { | |
870 | if( cons_channel ) { | |
871 | #if NARGOXTWENTYFIVE > 0 | |
a50e2bc0 | 872 | #include "cons.h" |
f04c49fa KS |
873 | /* This is unfortunate... |
874 | cons_send_on_vc(cons_channel, m, datalen); | |
875 | */ | |
876 | cons_netcmd( CONN_CLOSE, (struct isopcb *)0, | |
877 | cons_channel, CONS_NOT_DGM); | |
878 | IFDEBUG(D_ERROR_EMIT) | |
879 | printf("OUTPUT: dutype 0x%x channel 0x%x\n", | |
880 | dutype, cons_channel); | |
881 | ENDDEBUG | |
882 | #else NARGOXTWENTYFIVE | |
883 | printf("TP panic! cons channel 0x%x but not cons configured\n", | |
884 | cons_channel); | |
885 | #endif NARGOXTWENTYFIVE > 0 | |
886 | } else { | |
a50e2bc0 | 887 | #ifndef notdef |
f04c49fa KS |
888 | IFDEBUG(D_ERROR_EMIT) |
889 | printf("tp_error_emit sending DG: Laddr\n"); | |
a50e2bc0 | 890 | dump_addr((struct sockaddr *)laddr); |
f04c49fa | 891 | printf("Faddr\n"); |
a50e2bc0 | 892 | dump_addr((struct sockaddr *)faddr); |
f04c49fa KS |
893 | ENDDEBUG |
894 | return (*dgout_routine)( &laddr->siso_addr, &faddr->siso_addr, | |
895 | m, datalen, /* no route */ | |
896 | (caddr_t)0, /* nochecksum==false */0); | |
a50e2bc0 | 897 | #else notdef |
f04c49fa KS |
898 | IFDEBUG(D_ERROR_EMIT) |
899 | printf("tp_error_emit DROPPING \n", m); | |
900 | ENDDEBUG | |
901 | IncStat(ts_send_drop); | |
902 | m_freem(m); | |
903 | return 0; | |
a50e2bc0 | 904 | #endif notdef |
f04c49fa KS |
905 | } |
906 | } | |
907 | } |