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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
78ed81a3 | 33 | * from: @(#)tp_emit.c 7.9 (Berkeley) 5/9/91 |
34 | * $Id$ | |
15637ed4 RG |
35 | */ |
36 | ||
37 | /*********************************************************** | |
38 | Copyright IBM Corporation 1987 | |
39 | ||
40 | All Rights Reserved | |
41 | ||
42 | Permission to use, copy, modify, and distribute this software and its | |
43 | documentation for any purpose and without fee is hereby granted, | |
44 | provided that the above copyright notice appear in all copies and that | |
45 | both that copyright notice and this permission notice appear in | |
46 | supporting documentation, and that the name of IBM not be | |
47 | used in advertising or publicity pertaining to distribution of the | |
48 | software without specific, written prior permission. | |
49 | ||
50 | IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING | |
51 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL | |
52 | IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR | |
53 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, | |
54 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
55 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
56 | SOFTWARE. | |
57 | ||
58 | ******************************************************************/ | |
59 | ||
60 | /* | |
61 | * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison | |
62 | */ | |
78ed81a3 | 63 | |
15637ed4 RG |
64 | /* |
65 | * ARGO TP | |
66 | * | |
15637ed4 RG |
67 | * This file contains tp_emit() and tp_error_emit(), which |
68 | * form TPDUs and hand them to ip. | |
69 | * They take data in the form of mbuf chain, allocate mbufs as | |
70 | * necessary for headers, and set the fields as appropriate from | |
71 | * information found in the tpcb and net-level pcb. | |
72 | * | |
73 | * The worst thing about this code is adding the variable-length | |
74 | * options on a machine that requires alignment for any memory access | |
75 | * that isn't of size 1. See the macro ADDOPTION() below. | |
76 | * | |
77 | * We don't do any concatenation. (There's a kludge to test the | |
78 | * basic mechanism of separation under the 'w' tpdebug option, that's all.) | |
79 | */ | |
80 | ||
81 | #include "param.h" | |
78ed81a3 | 82 | #include "systm.h" |
15637ed4 RG |
83 | #include "mbuf.h" |
84 | #include "socket.h" | |
85 | #include "socketvar.h" | |
86 | #include "protosw.h" | |
87 | #include "errno.h" | |
88 | #include "types.h" | |
89 | #include "time.h" | |
90 | #include "iso.h" | |
91 | #include "iso_pcb.h" | |
92 | #include "argo_debug.h" | |
93 | #include "tp_timer.h" | |
94 | #include "tp_param.h" | |
95 | #include "tp_stat.h" | |
96 | #include "tp_pcb.h" | |
97 | #include "tp_tpdu.h" | |
98 | #include "tp_trace.h" | |
99 | #include "tp_meas.h" | |
100 | #include "tp_seq.h" | |
101 | #include "iso_errno.h" | |
102 | ||
103 | #include "../net/if.h" | |
104 | #ifdef TRUE | |
105 | #undef FALSE | |
106 | #undef TRUE | |
107 | #endif | |
108 | #include "../netccitt/x25.h" | |
109 | #include "../netccitt/pk.h" | |
110 | #include "../netccitt/pk_var.h" | |
111 | ||
112 | void iso_gen_csum(); | |
113 | ||
114 | ||
115 | /* Here is a mighty kludge. The token ring misorders packets if you | |
116 | * fire them at it too fast, and TP sans checksum is "too fast", so | |
117 | * we have introduced a delay when checksumming isn't used. | |
118 | */ | |
119 | char tp_delay = 0x00; /* delay to keep token ring from blowing it */ | |
120 | ||
121 | /* | |
122 | * NAME: tp_emit() | |
123 | * | |
124 | * CALLED FROM: tp.trans and from tp_sbsend() | |
125 | * | |
126 | * FUNCTION and ARGUMENTS: | |
127 | * Emits one tpdu of the type (dutype), of the format appropriate | |
128 | * to the connection described by the pcb (tpcb), with sequence | |
129 | * number (seq) (where appropriate), end-of-tsdu bit (eot) where | |
130 | * appropriate, and with the data in the mbuf chain (data). | |
131 | * For DR and ER tpdus, the argument (eot) is | |
132 | * the reason for issuing the tpdu rather than an end-of-tsdu indicator. | |
133 | * | |
134 | * RETURNS: | |
135 | * 0 OK | |
136 | * ENOBUFS | |
137 | * E* returned from net layer output rtn | |
138 | * | |
139 | * SIDE EFFECTS: | |
140 | * | |
141 | * NOTES: | |
142 | * | |
143 | * WE ASSUME that the tp header + all options will fit in ONE mbuf. | |
144 | * If mbufs are 256 this will most likely be true, but if they are 128 it's | |
145 | * possible that they won't. | |
146 | * If you used every option on the CR + max. user data you'd overrun | |
147 | * 112 but unless you used > 115 bytes for the security | |
148 | * parameter, it would fit in a 256-byte mbuf (240 bytes for the header) | |
149 | * We don't support the security parameter, so this isn't a problem. | |
150 | * If security is added, we ought to remove this assumption. | |
151 | * | |
152 | * We do not implement the flow control confirmation "element of procedure". | |
153 | * A) it should not affect interoperability, | |
154 | * B) it should not be necessary - the protocol will eventually | |
155 | * straighten things out w/o FCC, as long as we don't have severely | |
156 | * mismatched keepalive and inactivity timers, and | |
157 | * C) it appears not to be REQUIRED, and | |
158 | * D) it's incredibly grotesque, and no doubt will lengthen a few | |
159 | * critical paths. | |
160 | * HOWEVER, we're thinking about putting it in anyway, for | |
161 | * completeness, just like we did with ack subsequencing. | |
162 | */ | |
163 | ||
164 | int | |
165 | tp_emit(dutype, tpcb, seq, eot, data) | |
166 | int dutype; | |
167 | struct tp_pcb *tpcb; | |
168 | SeqNum seq; | |
169 | u_int eot; | |
170 | struct mbuf *data; | |
171 | { | |
172 | register struct tpdu *hdr; | |
173 | register struct mbuf *m; | |
174 | int csum_offset=0; | |
175 | int datalen = 0; | |
176 | int error = 0; | |
177 | ||
178 | /* NOTE: | |
179 | * here we treat tpdu_li as if it DID include the li field, up until | |
180 | * the end, at which time we subtract 1 | |
181 | * THis is because if we subtract 1 right away, we end up adding | |
182 | * one every time we add an option. | |
183 | */ | |
184 | IFDEBUG(D_EMIT) | |
185 | printf( | |
186 | "tp_emit dutype 0x%x, tpcb 0x%x, eot 0x%x, seq 0x%x, data 0x%x", | |
187 | dutype, tpcb, eot, seq, data); | |
188 | ENDDEBUG | |
189 | ||
190 | if (dutype == CR_TPDU || dutype == CC_TPDU) { | |
191 | m = (struct mbuf *) malloc((u_long)256, M_MBUF, M_DONTWAIT); | |
192 | if (m) { | |
193 | m->m_type = TPMT_TPHDR; | |
194 | mbstat.m_mtypes[TPMT_TPHDR]++; | |
195 | m->m_next = MNULL; | |
196 | m->m_nextpkt = MNULL; | |
197 | m->m_data = m->m_pktdat; | |
198 | m->m_flags = M_PKTHDR; | |
199 | } | |
200 | } else { | |
201 | MGETHDR(m, M_DONTWAIT, TPMT_TPHDR); | |
202 | } | |
203 | m->m_data += max_hdr; | |
204 | if (m == NULL) { | |
205 | if(data != (struct mbuf *)0) | |
206 | m_freem(data); | |
207 | error = ENOBUFS; | |
208 | goto done; | |
209 | } | |
210 | m->m_len = sizeof(struct tpdu); | |
211 | m->m_act = MNULL; | |
212 | ||
213 | hdr = mtod(m, struct tpdu *); | |
214 | bzero((caddr_t)hdr, sizeof(struct tpdu)); | |
215 | ||
216 | { | |
217 | int tp_headersize(); | |
218 | ||
219 | hdr->tpdu_type = dutype; | |
220 | hdr->tpdu_li = tp_headersize(dutype, tpcb); | |
221 | /* | |
222 | * class 0 doesn't use this for DT | |
223 | * it'll just get overwritten below | |
224 | */ | |
225 | hdr->tpdu_dref = htons(tpcb->tp_fref); | |
226 | if( tpcb->tp_use_checksum || | |
227 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4) )) { | |
228 | csum_offset = hdr->tpdu_li + 2; /* DOESN'T include csum */ | |
229 | ADDOPTION(TPP_checksum, hdr, 2, eot /* dummy arg */); | |
230 | IFDEBUG(D_CHKSUM) | |
231 | printf( | |
232 | "tp_emit: csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
233 | csum_offset, hdr->tpdu_li); | |
234 | ENDDEBUG | |
235 | } | |
236 | /* | |
237 | * VARIABLE PARTS... | |
238 | */ | |
239 | switch( dutype ) { | |
240 | ||
241 | case CR_TPDU_type: | |
242 | hdr->tpdu_CRdref_0 = 0; /* must be zero */ | |
243 | if (!tpcb->tp_cebit_off) { | |
244 | tpcb->tp_win_recv = tp_start_win << 8; | |
245 | LOCAL_CREDIT(tpcb); | |
246 | CONG_INIT_SAMPLE(tpcb); | |
247 | tpcb->tp_ackrcvd = 0; | |
248 | } | |
249 | else | |
250 | LOCAL_CREDIT(tpcb); | |
251 | ||
252 | ||
253 | case CC_TPDU_type: | |
254 | { | |
255 | u_char x; | |
256 | ||
257 | hdr->tpdu_CCsref = htons(tpcb->tp_lref); /* same as CRsref */ | |
258 | ||
259 | if( tpcb->tp_class > TP_CLASS_1 ) { | |
260 | /* ifdef CE_BIT, we did this in tp_input when the CR came in */ | |
261 | if (tpcb->tp_cebit_off) | |
262 | LOCAL_CREDIT( tpcb ); | |
263 | tpcb->tp_sent_uwe = tpcb->tp_lcredit -1; | |
264 | tpcb->tp_sent_rcvnxt = 1; | |
265 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; | |
266 | hdr->tpdu_cdt = tpcb->tp_lcredit; | |
267 | } else { | |
268 | #ifdef TPCONS | |
269 | if (tpcb->tp_netservice == ISO_CONS) { | |
270 | struct isopcb *isop = (struct isopcb *)tpcb->tp_npcb; | |
271 | struct pklcd *lcp = (struct pklcd *)(isop->isop_chan); | |
272 | lcp->lcd_flags &= ~X25_DG_CIRCUIT; | |
273 | } | |
274 | #endif | |
275 | hdr->tpdu_cdt = 0; | |
276 | } | |
277 | hdr->tpdu_CCclass = tp_mask_to_num(tpcb->tp_class); | |
278 | hdr->tpdu_CCoptions = | |
279 | (tpcb->tp_xtd_format? TPO_XTD_FMT:0) | | |
280 | (tpcb->tp_use_efc? TPO_USE_EFC:0); | |
281 | ||
282 | IFPERF(tpcb) | |
283 | u_char perf_meas = tpcb->tp_perf_on; | |
284 | ADDOPTION(TPP_perf_meas, hdr, sizeof(perf_meas), perf_meas); | |
285 | ENDPERF | |
286 | ||
287 | if( dutype == CR_TPDU_type ) { | |
288 | IncStat(ts_CR_sent); | |
289 | ||
290 | ASSERT( tpcb->tp_lsuffixlen > 0 ); | |
291 | ASSERT( tpcb->tp_fsuffixlen > 0 ); | |
292 | ||
293 | ADDOPTION(TPP_calling_sufx, hdr, | |
294 | tpcb->tp_lsuffixlen, tpcb->tp_lsuffix[0]); | |
295 | ADDOPTION(TPP_called_sufx, hdr, | |
296 | tpcb->tp_fsuffixlen, tpcb->tp_fsuffix[0]); | |
297 | } else { | |
298 | IncStat(ts_CC_sent); | |
299 | } | |
300 | ||
301 | ADDOPTION(TPP_tpdu_size, hdr, | |
302 | sizeof(tpcb->tp_tpdusize), tpcb->tp_tpdusize); | |
303 | ||
304 | if (tpcb->tp_class != TP_CLASS_0) { | |
305 | short millisec = 500*(tpcb->tp_sendack_ticks); | |
306 | ||
307 | millisec = htons(millisec); | |
308 | ADDOPTION(TPP_acktime, hdr, sizeof(short), millisec); | |
309 | ||
310 | x = (tpcb->tp_use_nxpd? TPAO_USE_NXPD: 0) | |
311 | | (tpcb->tp_use_rcc? TPAO_USE_RCC : 0) | |
312 | | (tpcb->tp_use_checksum?0: TPAO_NO_CSUM) | |
313 | | (tpcb->tp_xpd_service? TPAO_USE_TXPD: 0); | |
314 | ADDOPTION(TPP_addl_opt, hdr, 1, x); | |
315 | ||
316 | } | |
317 | ||
318 | if( (dutype == CR_TPDU_type) && (tpcb->tp_class != TP_CLASS_0)){ | |
319 | ||
320 | ASSERT( 1 == sizeof(tpcb->tp_vers) ); | |
321 | ADDOPTION(TPP_vers, hdr, 1, tpcb->tp_vers); | |
322 | ||
323 | /* for each alt protocol class x, | |
324 | * x = x<<4; | |
325 | * option = concat(option, x); | |
326 | * Well, for now we only have TP0 for an | |
327 | * alternative so... this is easy. | |
328 | * | |
329 | * HOWEVER... There should be NO alt protocol | |
330 | * class over CLNS. Need to see if the route suggests | |
331 | * CONS, and iff so add alt class. | |
332 | */ | |
333 | x = 0; | |
334 | ADDOPTION(TPP_alt_class, hdr, 1, x); | |
335 | } | |
336 | ||
337 | if( hdr->tpdu_li > MLEN) | |
338 | panic("tp_emit CR/CC"); | |
339 | } | |
340 | break; | |
341 | ||
342 | case DR_TPDU_type: | |
343 | if( hdr->tpdu_DRdref == 0 ) { | |
344 | /* don't issue the DR */ | |
345 | goto done; | |
346 | } | |
347 | hdr->tpdu_cdt = 0; | |
348 | hdr->tpdu_DRsref = htons(tpcb->tp_lref); | |
349 | hdr->tpdu_DRreason = (u_char)eot; /* WHICH BYTE OF THIS??? */ | |
350 | ||
351 | /* forget the add'l information variable part */ | |
352 | IncStat(ts_DR_sent); | |
353 | break; | |
354 | ||
355 | case DC_TPDU_type: /* not used in class 0 */ | |
356 | ASSERT( tpcb->tp_class != TP_CLASS_0); | |
357 | hdr->tpdu_DCsref = htons(tpcb->tp_lref); | |
358 | hdr->tpdu_cdt = 0; | |
359 | data = (struct mbuf *)0; | |
360 | IncStat(ts_DC_sent); | |
361 | break; | |
362 | ||
363 | case XAK_TPDU_type: /* xak not used in class 0 */ | |
364 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ | |
365 | hdr->tpdu_cdt = 0; | |
366 | ||
367 | IFTRACE(D_XPD) | |
368 | tptraceTPCB(TPPTXack, seq, 0, 0, 0, 0); | |
369 | ENDTRACE | |
370 | data = (struct mbuf *)0; | |
371 | if (tpcb->tp_xtd_format) { | |
372 | #ifdef BYTE_ORDER | |
373 | union seq_type seqeotX; | |
374 | ||
375 | seqeotX.s_seq = seq; | |
376 | seqeotX.s_eot = 1; | |
377 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
378 | #else | |
379 | hdr->tpdu_XAKseqX = seq; | |
380 | #endif BYTE_ORDER | |
381 | } else { | |
382 | hdr->tpdu_XAKseq = seq; | |
383 | } | |
384 | IncStat(ts_XAK_sent); | |
385 | IncPStat(tpcb, tps_XAK_sent); | |
386 | break; | |
387 | ||
388 | case XPD_TPDU_type: /* xpd not used in class 0 */ | |
389 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ | |
390 | hdr->tpdu_cdt = 0; | |
391 | if (tpcb->tp_xtd_format) { | |
392 | #ifdef BYTE_ORDER | |
393 | union seq_type seqeotX; | |
394 | ||
395 | seqeotX.s_seq = seq; | |
396 | seqeotX.s_eot = 1; | |
397 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
398 | #else | |
399 | hdr->tpdu_XPDseqX = seq; | |
400 | hdr->tpdu_XPDeotX = 1; /* always 1 for XPD tpdu */ | |
401 | #endif BYTE_ORDER | |
402 | } else { | |
403 | hdr->tpdu_XPDseq = seq; | |
404 | hdr->tpdu_XPDeot = 1; /* always 1 for XPD tpdu */ | |
405 | } | |
406 | IncStat(ts_XPD_sent); | |
407 | IncPStat(tpcb, tps_XPD_sent); | |
408 | ||
409 | /* kludge to test the input size checking */ | |
410 | IFDEBUG(D_SIZE_CHECK) | |
411 | /*if(data->m_len <= 16 && data->m_off < (MLEN-18) ) { | |
412 | printf("Sending too much data on XPD: 18 bytes\n"); | |
413 | data->m_len = 18; | |
414 | }*/ | |
415 | ENDDEBUG | |
416 | break; | |
417 | ||
418 | case DT_TPDU_type: | |
419 | hdr->tpdu_cdt = 0; | |
420 | IFTRACE(D_DATA) | |
421 | tptraceTPCB(TPPTmisc, "emit DT: eot seq tpdu_li", eot, seq, | |
422 | hdr->tpdu_li, 0); | |
423 | ENDTRACE | |
424 | if (tpcb->tp_xtd_format) { | |
425 | #ifdef BYTE_ORDER | |
426 | union seq_type seqeotX; | |
427 | ||
428 | seqeotX.s_seq = seq; | |
429 | seqeotX.s_eot = eot; | |
430 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
431 | #else | |
432 | hdr->tpdu_DTseqX = seq; | |
433 | hdr->tpdu_DTeotX = eot; | |
434 | #endif BYTE_ORDER | |
435 | } else if (tpcb->tp_class == TP_CLASS_0) { | |
436 | IFDEBUG(D_EMIT) | |
437 | printf("DT tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); | |
438 | dump_buf( hdr, hdr->tpdu_li + 1 ); | |
439 | ENDDEBUG | |
440 | ((struct tp0du *)hdr)->tp0du_eot = eot; | |
441 | ((struct tp0du *)hdr)->tp0du_mbz = 0; | |
442 | IFDEBUG(D_EMIT) | |
443 | printf("DT 2 tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); | |
444 | dump_buf( hdr, hdr->tpdu_li + 1 ); | |
445 | ENDDEBUG | |
446 | } else { | |
447 | hdr->tpdu_DTseq = seq; | |
448 | hdr->tpdu_DTeot = eot; | |
449 | } | |
450 | if(eot) { | |
451 | IncStat(ts_EOT_sent); | |
452 | } | |
453 | IncStat(ts_DT_sent); | |
454 | IncPStat(tpcb, tps_DT_sent); | |
455 | break; | |
456 | ||
457 | case AK_TPDU_type:/* ak not used in class 0 */ | |
458 | ASSERT( tpcb->tp_class != TP_CLASS_0); | |
459 | data = (struct mbuf *)0; | |
460 | { SeqNum olduwe = tpcb->tp_sent_uwe; | |
461 | ||
462 | tpcb->tp_sent_uwe = | |
463 | SEQ(tpcb,tpcb->tp_rcvnxt + tpcb->tp_lcredit -1); | |
464 | LOCAL_CREDIT( tpcb ); | |
465 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; | |
466 | ||
467 | IFDEBUG(D_RENEG) | |
468 | /* occasionally fake a reneging so | |
469 | you can test subsequencing */ | |
470 | if( olduwe & 0x1 ) { | |
471 | tpcb->tp_reneged = 1; | |
472 | IncStat(ts_ldebug); | |
473 | } | |
474 | ENDDEBUG | |
475 | /* Are we about to reneg on credit? | |
476 | * When might we do so? | |
477 | * a) when using optimistic credit (which we no longer do). | |
478 | * b) when drain() gets implemented (not in the plans). | |
479 | * c) when D_RENEG is on. | |
480 | * d) when DEC BIT response is implemented. | |
481 | * (not- when we do this, we'll need to implement flow control | |
482 | * confirmation) | |
483 | */ | |
484 | if( SEQ_LT(tpcb, tpcb->tp_sent_uwe, olduwe) ) { | |
485 | tpcb->tp_reneged = 1; | |
486 | IncStat(ts_lcdt_reduced); | |
487 | IFTRACE(D_CREDIT) | |
488 | tptraceTPCB(TPPTmisc, | |
489 | "RENEG: olduwe newuwe lcredit rcvnxt", | |
490 | olduwe, | |
491 | tpcb->tp_sent_uwe, tpcb->tp_lcredit, | |
492 | tpcb->tp_rcvnxt); | |
493 | ENDTRACE | |
494 | } | |
495 | ||
496 | IFPERF(tpcb) | |
497 | /* new lwe is less than old uwe means we're | |
498 | * acking before we received a whole window full | |
499 | */ | |
500 | if( SEQ_LT( tpcb, tpcb->tp_rcvnxt, olduwe) ) { | |
501 | /* tmp1 = number of pkts fewer than the full window */ | |
502 | register int tmp1 = | |
503 | (int) SEQ_SUB( tpcb, olduwe, tpcb->tp_rcvnxt); | |
504 | ||
505 | if(tmp1 > TP_PM_MAX) | |
506 | tmp1 = TP_PM_MAX; | |
507 | IncPStat( tpcb, tps_ack_early[tmp1] ); | |
508 | ||
509 | /* tmp1 = amt of new cdt we're advertising */ | |
510 | tmp1 = SEQ_SUB( tpcb, seq, tpcb->tp_sent_rcvnxt); | |
511 | if(tmp1 > TP_PM_MAX ) | |
512 | tmp1 = TP_PM_MAX; | |
513 | ||
514 | IncPStat( tpcb, | |
515 | tps_cdt_acked [ tmp1 ] | |
516 | [ ((tpcb->tp_lcredit > TP_PM_MAX)? | |
517 | TP_PM_MAX:tpcb->tp_lcredit) ] ); | |
518 | ||
519 | } | |
520 | ENDPERF | |
521 | } | |
522 | IFTRACE(D_ACKSEND) | |
523 | tptraceTPCB(TPPTack, seq, tpcb->tp_lcredit, tpcb->tp_sent_uwe, | |
524 | tpcb->tp_r_subseq, 0); | |
525 | ENDTRACE | |
526 | if (tpcb->tp_xtd_format) { | |
527 | #ifdef BYTE_ORDER | |
528 | union seq_type seqeotX; | |
529 | ||
530 | seqeotX.s_seq = seq; | |
531 | seqeotX.s_eot = 0; | |
532 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); | |
533 | hdr->tpdu_AKcdtX = htons(tpcb->tp_lcredit); | |
534 | #else | |
535 | hdr->tpdu_cdt = 0; | |
536 | hdr->tpdu_AKseqX = seq; | |
537 | hdr->tpdu_AKcdtX = tpcb->tp_lcredit; | |
538 | #endif BYTE_ORDER | |
539 | } else { | |
540 | hdr->tpdu_AKseq = seq; | |
541 | hdr->tpdu_AKcdt = tpcb->tp_lcredit; | |
542 | } | |
543 | if ((tpcb->tp_class == TP_CLASS_4) && tpcb->tp_reneged ) { | |
544 | /* | |
545 | * Ack subsequence parameter req'd if WE reneged on | |
546 | * credit offered. (ISO 8073, 12.2.3.8.2, p. 74) | |
547 | */ | |
548 | IFDEBUG(D_RENEG) | |
549 | printf("Adding subseq 0x%x\n", tpcb->tp_s_subseq); | |
550 | ENDDEBUG | |
551 | tpcb->tp_s_subseq++; | |
552 | /* | |
553 | * add tmp subseq and do a htons on it. | |
554 | */ | |
555 | ADDOPTION(TPP_subseq, hdr, | |
556 | sizeof(tpcb->tp_s_subseq), tpcb->tp_s_subseq); | |
557 | } else | |
558 | tpcb->tp_s_subseq = 0; | |
559 | ||
560 | if ( tpcb->tp_sendfcc || eot ) /* overloaded to mean SEND FCC */ { | |
561 | /* | |
562 | * Rules for sending FCC ("should" send when) : | |
563 | * %a) received an ack from peer with NO NEWS whatsoever, | |
564 | * and it did not contain an FCC | |
565 | * b) received an ack from peer that opens its closed window. | |
566 | * c) received an ack from peer after it reneged on its | |
567 | * offered credit, AND this ack raises UWE but LWE is same | |
568 | * and below UWE at time of reneging (reduction) | |
569 | * Now, ISO 8073 12.2.3.8.3 says | |
570 | * that a retransmitted AK shall not contain the FCC | |
571 | * parameter. Now, how the hell you tell the difference | |
572 | * between a retransmitted ack and an ack that's sent in | |
573 | * response to a received ack, I don't know, because without | |
574 | * any local activity, and w/o any received DTs, they | |
575 | * will contain exactly the same credit/seq# information. | |
576 | * Anyway, given that the "retransmission of acks" | |
577 | * procedure (ISO 8073 12.2.3.8.3) is optional, and we | |
578 | * don't do it (although the peer can't tell that), we | |
579 | * ignore this last rule. | |
580 | * | |
581 | * We send FCC for reasons a) and b) only. | |
582 | * To add reason c) would require a ridiculous amount of state. | |
583 | * | |
584 | */ | |
585 | u_short bogus[4]; /* lwe(32), subseq(16), cdt(16) */ | |
586 | SeqNum lwe; | |
587 | u_short subseq, fcredit; | |
588 | ||
589 | tpcb->tp_sendfcc = 0; | |
590 | ||
591 | lwe = (SeqNum) htonl(tpcb->tp_snduna); | |
592 | subseq = htons(tpcb->tp_r_subseq); | |
593 | fcredit = htons(tpcb->tp_fcredit); | |
594 | ||
595 | bcopy((caddr_t) &lwe, (caddr_t)&bogus[0], sizeof(SeqNum)); | |
596 | bcopy((caddr_t) &subseq, (caddr_t)&bogus[2], sizeof(u_short)); | |
597 | bcopy((caddr_t) &fcredit, (caddr_t)&bogus[3], sizeof(u_short)); | |
598 | ||
599 | IFTRACE(D_ACKSEND) | |
600 | tptraceTPCB(TPPTmisc, | |
601 | "emit w/FCC: snduna r_subseq fcredit", | |
602 | tpcb->tp_snduna, tpcb->tp_r_subseq, | |
603 | tpcb->tp_fcredit, 0); | |
604 | ENDTRACE | |
605 | ||
606 | IFDEBUG(D_ACKSEND) | |
607 | printf("Calling ADDOPTION 0x%x, 0x%x, 0x%x,0x%x\n", | |
608 | TPP_flow_cntl_conf, | |
609 | hdr, sizeof(bogus), bogus[0]); | |
610 | ENDDEBUG | |
611 | ADDOPTION(TPP_flow_cntl_conf, hdr, sizeof(bogus), bogus[0]); | |
612 | IFDEBUG(D_ACKSEND) | |
613 | printf("after ADDOPTION hdr 0x%x hdr->tpdu_li 0x%x\n", | |
614 | hdr, hdr->tpdu_li); | |
615 | printf( | |
616 | "after ADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
617 | csum_offset, hdr->tpdu_li); | |
618 | ENDDEBUG | |
619 | ||
620 | } | |
621 | tpcb->tp_reneged = 0; | |
622 | tpcb->tp_sent_rcvnxt = seq; | |
623 | tp_ctimeout(tpcb->tp_refp, TM_sendack, | |
624 | (int)tpcb->tp_keepalive_ticks); | |
625 | IncStat(ts_AK_sent); | |
626 | IncPStat(tpcb, tps_AK_sent); | |
627 | IFDEBUG(D_ACKSEND) | |
628 | printf( | |
629 | "2 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
630 | csum_offset, hdr->tpdu_li); | |
631 | ENDDEBUG | |
632 | break; | |
633 | ||
634 | case ER_TPDU_type: | |
635 | hdr->tpdu_ERreason = eot; | |
636 | hdr->tpdu_cdt = 0; | |
637 | /* no user data */ | |
638 | data = (struct mbuf *)0; | |
639 | IncStat(ts_ER_sent); | |
640 | break; | |
641 | } | |
642 | ||
643 | } | |
644 | ASSERT( ((int)hdr->tpdu_li > 0) && ((int)hdr->tpdu_li < MLEN) ); | |
645 | ||
646 | m->m_next = data; | |
647 | ||
648 | ASSERT( hdr->tpdu_li < MLEN ); /* leave this in */ | |
649 | ASSERT( hdr->tpdu_li != 0 ); /* leave this in */ | |
650 | ||
651 | m->m_len = hdr->tpdu_li ; | |
652 | hdr->tpdu_li --; /* doesn't include the li field */ | |
653 | ||
654 | datalen = m_datalen( m ); /* total len */ | |
655 | ||
656 | ASSERT( datalen <= tpcb->tp_l_tpdusize ); /* may become a problem | |
657 | when CLNP is used; leave in here for the time being */ | |
658 | IFDEBUG(D_ACKSEND) | |
659 | printf( | |
660 | "4 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", | |
661 | csum_offset, hdr->tpdu_li); | |
662 | ENDDEBUG | |
663 | if( datalen > tpcb->tp_l_tpdusize ) { | |
664 | printf("data len 0x%x tpcb->tp_l_tpdusize 0x%x\n", | |
665 | datalen, tpcb->tp_l_tpdusize); | |
666 | } | |
667 | IFDEBUG(D_EMIT) | |
668 | printf( | |
669 | "tp_emit before gen_csum m_len 0x%x, csum_offset 0x%x, datalen 0x%x\n", | |
670 | m->m_len, csum_offset, datalen); | |
671 | ENDDEBUG | |
672 | if( tpcb->tp_use_checksum || | |
673 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4)) ) { | |
674 | iso_gen_csum(m, csum_offset, datalen); | |
675 | } | |
676 | ||
677 | IFDEBUG(D_EMIT) | |
678 | printf("tp_emit before tpxxx_output tpcb 0x%x, dutype 0x%x, datalen 0x%x\n", | |
679 | tpcb, dutype, datalen); | |
680 | dump_buf(mtod(m, caddr_t), datalen); | |
681 | ENDDEBUG | |
682 | ||
683 | IFPERF(tpcb) | |
684 | if( dutype == DT_TPDU_type ) { | |
685 | PStat(tpcb, Nb_to_ll) += (datalen - m->m_len); | |
686 | tpmeas( tpcb->tp_lref, TPtime_to_ll, (struct timeval *)0, | |
687 | seq, PStat(tpcb, Nb_to_ll), (datalen - m->m_len)); | |
688 | } | |
689 | ENDPERF | |
690 | ||
691 | IFTRACE(D_EMIT) | |
692 | tptraceTPCB(TPPTtpduout, dutype, hdr, hdr->tpdu_li+1, datalen, 0); | |
693 | ENDTRACE | |
694 | IFDEBUG(D_EMIT) | |
695 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", | |
696 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); | |
697 | ENDDEBUG | |
698 | ||
699 | { extern char tp_delay; | |
700 | ||
701 | if( tp_delay ) | |
702 | if( tpcb->tp_use_checksum == 0 ) { | |
703 | register u_int i = tp_delay; | |
704 | for (; i!= 0; i--) | |
705 | (void) iso_check_csum(m, datalen); | |
706 | } | |
707 | } | |
708 | ASSERT( m->m_len > 0 ); | |
709 | error = (tpcb->tp_nlproto->nlp_output)(tpcb->tp_npcb, m, datalen, | |
710 | !tpcb->tp_use_checksum); | |
711 | IFDEBUG(D_EMIT) | |
712 | printf("OUTPUT: returned 0x%x\n", error); | |
713 | ENDDEBUG | |
714 | IFTRACE(D_EMIT) | |
715 | tptraceTPCB(TPPTmisc, | |
716 | "tp_emit nlproto->output netservice returns datalen", | |
717 | tpcb->tp_nlproto->nlp_output, tpcb->tp_netservice, error, datalen); | |
718 | ENDTRACE | |
719 | done: | |
720 | if( error == E_CO_QFULL ) { | |
721 | tp_quench(tpcb, PRC_QUENCH); | |
722 | return 0; | |
723 | } | |
724 | return error; | |
725 | } | |
726 | /* | |
727 | * NAME: tp_error_emit() | |
728 | * CALLED FROM: tp_input() when a DR or ER is to be issued in | |
729 | * response to an input error. | |
730 | * FUNCTION and ARGUMENTS: | |
731 | * The error type is the first argument. | |
732 | * The argument (sref) is the source reference on the bad incoming tpdu, | |
733 | * and is used for a destination reference on the outgoing packet. | |
734 | * (faddr) and (laddr) are the foreign and local addresses for this | |
735 | * connection. | |
736 | * (erdata) is a ptr to the errant incoming tpdu, and is copied into the | |
737 | * outgoing ER, if an ER is to be issued. | |
738 | * (erlen) is the number of octets of the errant tpdu that we should | |
739 | * try to copy. | |
740 | * (tpcb) is the pcb that describes the connection for which the bad tpdu | |
741 | * arrived. | |
742 | * RETURN VALUES: | |
743 | * 0 OK | |
744 | * ENOBUFS | |
745 | * E* from net layer datagram output routine | |
746 | * SIDE EFFECTS: | |
747 | * | |
748 | * NOTES: | |
749 | */ | |
750 | ||
751 | int | |
752 | tp_error_emit(error, sref, faddr, laddr, erdata, erlen, tpcb, cons_channel, | |
753 | dgout_routine) | |
754 | int error; | |
755 | u_long sref; | |
756 | struct sockaddr_iso *faddr, *laddr; | |
757 | struct mbuf *erdata; | |
758 | int erlen; | |
759 | struct tp_pcb *tpcb; | |
760 | int cons_channel; | |
761 | int (*dgout_routine)(); | |
762 | { | |
763 | int dutype; | |
764 | int datalen = 0; | |
765 | register struct tpdu *hdr; | |
766 | register struct mbuf *m; | |
767 | int csum_offset; | |
768 | ||
769 | IFTRACE(D_ERROR_EMIT) | |
770 | tptrace(TPPTmisc, "tp_error_emit error sref tpcb erlen", | |
771 | error, sref, tpcb, erlen); | |
772 | ENDTRACE | |
773 | IFDEBUG(D_ERROR_EMIT) | |
774 | printf( | |
775 | "tp_error_emit error 0x%x sref 0x%x tpcb 0x%x erlen 0x%x chan 0x%x\n", | |
776 | error, sref, tpcb, erlen, cons_channel); | |
777 | ENDDEBUG | |
778 | ||
779 | MGET(m, M_DONTWAIT, TPMT_TPHDR); | |
780 | if (m == NULL) { | |
781 | return ENOBUFS; | |
782 | } | |
783 | m->m_len = sizeof(struct tpdu); | |
784 | m->m_act = MNULL; | |
785 | ||
786 | hdr = mtod(m, struct tpdu *); | |
787 | ||
788 | IFDEBUG(D_ERROR_EMIT) | |
789 | printf("[error 0x%x] [error&0xff 0x%x] [(char)error 0x%x]\n", | |
790 | error, error&0xff, (char)error); | |
791 | ENDDEBUG | |
792 | ||
793 | ||
794 | if (error & TP_ERROR_SNDC) | |
795 | dutype = DC_TPDU_type; | |
796 | else if (error & 0x40) { | |
797 | error &= ~0x40; | |
798 | dutype = ER_TPDU_type; | |
799 | } else | |
800 | dutype = DR_TPDU_type; | |
801 | error &= 0xff; | |
802 | ||
803 | hdr->tpdu_type = dutype; | |
804 | hdr->tpdu_cdt = 0; | |
805 | ||
806 | switch( dutype ) { | |
807 | ||
808 | case DC_TPDU_type: | |
809 | IncStat(ts_DC_sent); | |
810 | hdr->tpdu_li = 6; | |
811 | hdr->tpdu_DCdref = htons(sref); | |
812 | hdr->tpdu_DCsref = tpcb ? htons(tpcb->tp_lref) : 0; | |
813 | IFDEBUG(D_ERROR_EMIT) | |
814 | printf("DC case:\n"); | |
815 | dump_buf( hdr, 6); | |
816 | ENDDEBUG | |
817 | /* forget the add'l information variable part */ | |
818 | break; | |
819 | ||
820 | case DR_TPDU_type: | |
821 | IncStat(ts_DR_sent); | |
822 | hdr->tpdu_li = 7; | |
823 | hdr->tpdu_DRdref = htons(sref); | |
824 | hdr->tpdu_DRsref = 0; | |
825 | hdr->tpdu_DRreason = (char)error; | |
826 | IFDEBUG(D_ERROR_EMIT) | |
827 | printf("DR case:\n"); | |
828 | dump_buf( hdr, 7); | |
829 | ENDDEBUG | |
830 | /* forget the add'l information variable part */ | |
831 | break; | |
832 | ||
833 | case ER_TPDU_type: | |
834 | IncStat(ts_ER_sent); | |
835 | hdr->tpdu_li = 5; | |
836 | hdr->tpdu_ERreason = (char)error; | |
837 | break; | |
838 | ||
839 | default: | |
840 | ASSERT(0); | |
841 | printf("TP PANIC: bad dutype 0x%x\n", dutype); | |
842 | } | |
843 | ||
844 | if(tpcb) | |
845 | if( tpcb->tp_use_checksum ) { | |
846 | ADDOPTION(TPP_checksum, hdr, 2, csum_offset /* dummy argument */); | |
847 | csum_offset = hdr->tpdu_li - 2; | |
848 | } | |
849 | ||
850 | ASSERT( hdr->tpdu_li < MLEN ); | |
851 | ||
852 | if (dutype == ER_TPDU_type) { | |
853 | /* copy the errant tpdu into another 'variable part' */ | |
854 | register caddr_t P; | |
855 | ||
856 | IFTRACE(D_ERROR_EMIT) | |
857 | tptrace(TPPTmisc, "error_emit ER len tpduli", erlen, hdr->tpdu_li, | |
858 | 0,0); | |
859 | ENDTRACE | |
860 | IFDEBUG(D_ERROR_EMIT) | |
861 | printf("error_emit ER len 0x%x tpduli 0x%x\n", erlen, hdr->tpdu_li); | |
862 | ENDDEBUG | |
863 | ||
864 | /* copy at most as many octets for which you have room */ | |
865 | if (erlen + hdr->tpdu_li + 2 > TP_MAX_HEADER_LEN) | |
866 | erlen = TP_MAX_HEADER_LEN - hdr->tpdu_li - 2; | |
867 | ||
868 | /* add the "invalid tpdu" parameter : required in class 0 */ | |
869 | P = (caddr_t)hdr + (int)(hdr->tpdu_li); | |
870 | vbptr(P)->tpv_code = TPP_invalid_tpdu; /* parameter code */ | |
871 | vbptr(P)->tpv_len = erlen; /* parameter length */ | |
872 | m->m_len = hdr->tpdu_li + 2; /* 1 for code, 1 for length */ | |
873 | ||
874 | /* tp_input very likely handed us an mbuf chain w/ nothing in | |
875 | * the first mbuf and the data following the empty mbuf | |
876 | */ | |
877 | if(erdata->m_len == 0) { | |
878 | erdata = m_free(erdata); /* returns the next mbuf on the chain */ | |
879 | } | |
880 | /* | |
881 | * copy only up to the bad octet | |
882 | * (or max that will fit in a header | |
883 | */ | |
884 | m->m_next = m_copy(erdata, 0, erlen); | |
885 | hdr->tpdu_li += erlen + 2; | |
886 | m_freem(erdata); | |
887 | } else { | |
888 | IFDEBUG(D_ERROR_EMIT) | |
889 | printf("error_emit DR error tpduli 0x%x\n", error, hdr->tpdu_li); | |
890 | dump_buf( (char *)hdr, hdr->tpdu_li ); | |
891 | ENDDEBUG | |
892 | m->m_len = hdr->tpdu_li ; | |
893 | m_freem(erdata); | |
894 | } | |
895 | ||
896 | hdr->tpdu_li --; | |
897 | IFTRACE(D_ERROR_EMIT) | |
898 | tptrace(TPPTtpduout, 2, hdr, hdr->tpdu_li+1, 0, 0); | |
899 | ENDTRACE | |
900 | ||
901 | datalen = m_datalen( m); | |
902 | ||
903 | if(tpcb) { | |
904 | if( tpcb->tp_use_checksum ) { | |
905 | IFTRACE(D_ERROR_EMIT) | |
906 | tptrace(TPPTmisc, "before gen csum datalen", datalen,0,0,0); | |
907 | ENDTRACE | |
908 | IFDEBUG(D_ERROR_EMIT) | |
909 | printf("before gen csum datalen 0x%x, csum_offset 0x%x\n", | |
910 | datalen, csum_offset); | |
911 | ENDDEBUG | |
912 | ||
913 | iso_gen_csum(m, csum_offset, datalen); | |
914 | } | |
915 | ||
916 | IFDEBUG(D_ERROR_EMIT) | |
917 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", | |
918 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); | |
919 | ENDDEBUG | |
920 | /* Problem: if packet comes in on ISO but sock is listening | |
921 | * in INET, this assertion will fail. | |
922 | * Have to believe the argument, not the nlp_proto. | |
923 | ASSERT( tpcb->tp_nlproto->nlp_dgoutput == dgout_routine ); | |
924 | */ | |
925 | ||
926 | IFDEBUG(D_ERROR_EMIT) | |
927 | printf("tp_error_emit 1 sending DG: Laddr\n"); | |
928 | dump_addr((struct sockaddr *)laddr); | |
929 | printf("Faddr\n"); | |
930 | dump_addr((struct sockaddr *)faddr); | |
931 | ENDDEBUG | |
932 | return (tpcb->tp_nlproto->nlp_dgoutput)( | |
933 | &laddr->siso_addr, | |
934 | &faddr->siso_addr, | |
935 | m, datalen, | |
936 | /* no route */ (caddr_t)0, !tpcb->tp_use_checksum); | |
937 | } else { | |
938 | if( cons_channel ) { | |
939 | #ifdef TPCONS | |
940 | tpcons_dg_output(cons_channel, m, datalen); | |
941 | pk_disconnect((struct pklcd *)cons_channel); | |
942 | IFDEBUG(D_ERROR_EMIT) | |
943 | printf("OUTPUT: dutype 0x%x channel 0x%x\n", | |
944 | dutype, cons_channel); | |
945 | ENDDEBUG | |
946 | #else | |
947 | printf("TP panic! cons channel 0x%x but not cons configured\n", | |
948 | cons_channel); | |
949 | #endif | |
950 | } else { | |
951 | #ifndef notdef | |
952 | IFDEBUG(D_ERROR_EMIT) | |
953 | printf("tp_error_emit sending DG: Laddr\n"); | |
954 | dump_addr((struct sockaddr *)laddr); | |
955 | printf("Faddr\n"); | |
956 | dump_addr((struct sockaddr *)faddr); | |
957 | ENDDEBUG | |
958 | return (*dgout_routine)( &laddr->siso_addr, &faddr->siso_addr, | |
959 | m, datalen, /* no route */ | |
960 | (caddr_t)0, /* nochecksum==false */0); | |
961 | #else notdef | |
962 | IFDEBUG(D_ERROR_EMIT) | |
963 | printf("tp_error_emit DROPPING \n", m); | |
964 | ENDDEBUG | |
965 | IncStat(ts_send_drop); | |
966 | m_freem(m); | |
967 | return 0; | |
968 | #endif notdef | |
969 | } | |
970 | } | |
971 | } |