| 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 $ |
| 32 | * |
| 33 | * This file contains tp_emit() and tp_error_emit(), which |
| 34 | * form TPDUs and hand them to ip. |
| 35 | * They take data in the form of mbuf chain, allocate mbufs as |
| 36 | * necessary for headers, and set the fields as appropriate from |
| 37 | * information found in the tpcb and net-level pcb. |
| 38 | * |
| 39 | * The worst thing about this code is adding the variable-length |
| 40 | * options on a machine that requires alignment for any memory access |
| 41 | * that isn't of size 1. See the macro ADDOPTION() below. |
| 42 | * |
| 43 | * We don't do any concatenation. (There's a kludge to test the |
| 44 | * basic mechanism of separation under the 'w' tpdebug option, that's all.) |
| 45 | */ |
| 46 | |
| 47 | #ifndef lint |
| 48 | static char *rcsid = "$Header: tp_emit.c,v 5.5 88/11/18 17:27:20 nhall Exp $"; |
| 49 | #endif lint |
| 50 | |
| 51 | |
| 52 | #include "argoxtwentyfive.h" |
| 53 | #include "param.h" |
| 54 | #include "mbuf.h" |
| 55 | #include "socket.h" |
| 56 | #include "socketvar.h" |
| 57 | #include "protosw.h" |
| 58 | #include "errno.h" |
| 59 | #include "types.h" |
| 60 | #include "time.h" |
| 61 | #include "../netiso/iso.h" |
| 62 | #include "../netiso/argo_debug.h" |
| 63 | #include "../netiso/tp_timer.h" |
| 64 | #include "../netiso/tp_param.h" |
| 65 | #include "../netiso/tp_stat.h" |
| 66 | #include "../netiso/tp_pcb.h" |
| 67 | #include "../netiso/tp_tpdu.h" |
| 68 | #include "../netiso/tp_trace.h" |
| 69 | #include "../netiso/tp_meas.h" |
| 70 | #include "../netiso/tp_seq.h" |
| 71 | #include "../netiso/iso_errno.h" |
| 72 | |
| 73 | void iso_gen_csum(); |
| 74 | |
| 75 | |
| 76 | /* Here is a mighty kludge. The token ring misorders packets if you |
| 77 | * fire them at it too fast, and TP sans checksum is "too fast", so |
| 78 | * we have introduced a delay when checksumming isn't used. |
| 79 | */ |
| 80 | char tp_delay = 0x00; /* delay to keep token ring from blowing it */ |
| 81 | |
| 82 | /* |
| 83 | * NAME: tp_emit() |
| 84 | * |
| 85 | * CALLED FROM: tp.trans and from tp_sbsend() |
| 86 | * |
| 87 | * FUNCTION and ARGUMENTS: |
| 88 | * Emits one tpdu of the type (dutype), of the format appropriate |
| 89 | * to the connection described by the pcb (tpcb), with sequence |
| 90 | * number (seq) (where appropriate), end-of-tsdu bit (eot) where |
| 91 | * appropriate, and with the data in the mbuf chain (data). |
| 92 | * For DR and ER tpdus, the argument (eot) is |
| 93 | * the reason for issuing the tpdu rather than an end-of-tsdu indicator. |
| 94 | * |
| 95 | * RETURNS: |
| 96 | * 0 OK |
| 97 | * ENOBUFS |
| 98 | * E* returned from net layer output rtn |
| 99 | * |
| 100 | * SIDE EFFECTS: |
| 101 | * |
| 102 | * NOTES: |
| 103 | * |
| 104 | * WE ASSUME that the tp header + all options will fit in ONE mbuf. |
| 105 | * If mbufs are 256 this will most likely be true, but if they are 128 it's |
| 106 | * possible that they won't. |
| 107 | * If you used every option on the CR + max. user data you'd overrun |
| 108 | * 112 but unless you used > 115 bytes for the security |
| 109 | * parameter, it would fit in a 256-byte mbuf (240 bytes for the header) |
| 110 | * We don't support the security parameter, so this isn't a problem. |
| 111 | * If security is added, we ought to remove this assumption. |
| 112 | * |
| 113 | * We do not implement the flow control confirmation "element of procedure". |
| 114 | * A) it should not affect interoperability, |
| 115 | * B) it should not be necessary - the protocol will eventually |
| 116 | * straighten things out w/o FCC, as long as we don't have severely |
| 117 | * mismatched keepalive and inactivity timers, and |
| 118 | * C) it appears not to be REQUIRED, and |
| 119 | * D) it's incredibly grotesque, and no doubt will lengthen a few |
| 120 | * critical paths. |
| 121 | * HOWEVER, we're thinking about putting it in anyway, for |
| 122 | * completeness, just like we did with ack subsequencing. |
| 123 | */ |
| 124 | |
| 125 | int |
| 126 | tp_emit(dutype, tpcb, seq, eot, data) |
| 127 | int dutype; |
| 128 | struct tp_pcb *tpcb; |
| 129 | SeqNum seq; |
| 130 | u_int eot; |
| 131 | struct mbuf *data; |
| 132 | { |
| 133 | register struct tpdu *hdr; |
| 134 | register struct mbuf *m; |
| 135 | int csum_offset=0; |
| 136 | int datalen = 0; |
| 137 | int error = 0; |
| 138 | |
| 139 | /* NOTE: |
| 140 | * here we treat tpdu_li as if it DID include the li field, up until |
| 141 | * the end, at which time we subtract 1 |
| 142 | * THis is because if we subtract 1 right away, we end up adding |
| 143 | * one every time we add an option. |
| 144 | */ |
| 145 | IFDEBUG(D_EMIT) |
| 146 | printf( |
| 147 | "tp_emit dutype 0x%x, tpcb 0x%x, eot 0x%x, seq 0x%x, data 0x%x mfree 0x%x", |
| 148 | dutype, tpcb, eot, seq, data, mfree); |
| 149 | ENDDEBUG |
| 150 | |
| 151 | MGET(m, M_DONTWAIT, TPMT_TPHDR); |
| 152 | if (m == NULL) { |
| 153 | if(data != (struct mbuf *)0) |
| 154 | m_freem(data); |
| 155 | error = ENOBUFS; |
| 156 | goto done; |
| 157 | } |
| 158 | m->m_len = sizeof(struct tpdu); |
| 159 | m->m_act = MNULL; |
| 160 | |
| 161 | hdr = mtod(m, struct tpdu *); |
| 162 | bzero(hdr, sizeof(struct tpdu)); |
| 163 | |
| 164 | { |
| 165 | int tp_headersize(); |
| 166 | |
| 167 | hdr->tpdu_type = dutype; |
| 168 | hdr->tpdu_li = tp_headersize(dutype, tpcb); |
| 169 | /* |
| 170 | * class 0 doesn't use this for DT |
| 171 | * it'll just get overwritten below |
| 172 | */ |
| 173 | hdr->tpdu_dref = htons(tpcb->tp_fref); |
| 174 | if( tpcb->tp_use_checksum || |
| 175 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4) )) { |
| 176 | csum_offset = hdr->tpdu_li + 2; /* DOESN'T include csum */ |
| 177 | ADDOPTION(TPP_checksum, hdr, 2, eot /* dummy arg */); |
| 178 | IFDEBUG(D_CHKSUM) |
| 179 | printf( |
| 180 | "tp_emit: csum_offset 0x%x, hdr->tpdu_li 0x%x\n", |
| 181 | csum_offset, hdr->tpdu_li); |
| 182 | ENDDEBUG |
| 183 | } |
| 184 | /* |
| 185 | * VARIABLE PARTS... |
| 186 | */ |
| 187 | switch( dutype ) { |
| 188 | |
| 189 | case CR_TPDU_type: |
| 190 | hdr->tpdu_CRdref_0 = htons(0); /* must be zero */ |
| 191 | |
| 192 | case CC_TPDU_type: |
| 193 | { |
| 194 | u_char x; |
| 195 | |
| 196 | hdr->tpdu_CCsref = htons(tpcb->tp_lref); /* same as CRsref */ |
| 197 | |
| 198 | if( tpcb->tp_class > TP_CLASS_1 ) { |
| 199 | LOCAL_CREDIT( tpcb ); |
| 200 | tpcb->tp_sent_uwe = tpcb->tp_lcredit -1; |
| 201 | tpcb->tp_sent_rcvnxt = 1; |
| 202 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; |
| 203 | hdr->tpdu_cdt = tpcb->tp_lcredit; |
| 204 | } else { |
| 205 | hdr->tpdu_cdt = 0; |
| 206 | } |
| 207 | hdr->tpdu_CCclass = tp_mask_to_num(tpcb->tp_class); |
| 208 | hdr->tpdu_CCoptions = |
| 209 | (tpcb->tp_xtd_format? TPO_XTD_FMT:0) | |
| 210 | (tpcb->tp_use_efc? TPO_USE_EFC:0); |
| 211 | |
| 212 | IFPERF(tpcb) |
| 213 | u_char perf_meas = tpcb->tp_perf_on; |
| 214 | ADDOPTION(TPP_perf_meas, hdr, sizeof(perf_meas), perf_meas); |
| 215 | ENDPERF |
| 216 | |
| 217 | if( dutype == CR_TPDU_type ) { |
| 218 | IncStat(ts_CR_sent); |
| 219 | |
| 220 | ASSERT( tpcb->tp_lsuffixlen > 0 ); |
| 221 | ASSERT( tpcb->tp_fsuffixlen > 0 ); |
| 222 | |
| 223 | ADDOPTION(TPP_calling_sufx, hdr, |
| 224 | tpcb->tp_lsuffixlen, tpcb->tp_lsuffix); |
| 225 | ADDOPTION(TPP_called_sufx, hdr, |
| 226 | tpcb->tp_fsuffixlen, tpcb->tp_fsuffix); |
| 227 | } else { |
| 228 | IncStat(ts_CC_sent); |
| 229 | } |
| 230 | |
| 231 | ADDOPTION(TPP_tpdu_size, hdr, |
| 232 | sizeof(tpcb->tp_tpdusize), tpcb->tp_tpdusize); |
| 233 | |
| 234 | if (tpcb->tp_class != TP_CLASS_0) { |
| 235 | short millisec = 500*(tpcb->tp_sendack_ticks); |
| 236 | |
| 237 | millisec = htons(millisec); |
| 238 | ADDOPTION(TPP_acktime, hdr, sizeof(short), millisec); |
| 239 | |
| 240 | x = (tpcb->tp_use_nxpd? TPAO_USE_NXPD: 0) |
| 241 | | (tpcb->tp_use_rcc? TPAO_USE_RCC : 0) |
| 242 | | (tpcb->tp_use_checksum?0: TPAO_NO_CSUM) |
| 243 | | (tpcb->tp_xpd_service? TPAO_USE_TXPD: 0); |
| 244 | ADDOPTION(TPP_addl_opt, hdr, 1, x); |
| 245 | |
| 246 | } |
| 247 | |
| 248 | if( (dutype == CR_TPDU_type) && (tpcb->tp_class != TP_CLASS_0)){ |
| 249 | |
| 250 | ASSERT( 1 == sizeof(tpcb->tp_vers) ); |
| 251 | ADDOPTION(TPP_vers, hdr, 1, tpcb->tp_vers); |
| 252 | |
| 253 | /* for each alt protocol class x, |
| 254 | * x = x<<4; |
| 255 | * option = concat(option, x); |
| 256 | * Well, for now we only have TP0 for an |
| 257 | * alternative so... this is easy. |
| 258 | * |
| 259 | * HOWEVER... There should be NO alt protocol |
| 260 | * class over CLNS. Need to see if the route suggests |
| 261 | * CONS, and iff so add alt class. |
| 262 | */ |
| 263 | x = 0; |
| 264 | ADDOPTION(TPP_alt_class, hdr, 1, x); |
| 265 | } |
| 266 | |
| 267 | if( hdr->tpdu_li > MLEN) |
| 268 | panic("tp_emit CR/CC"); |
| 269 | } |
| 270 | break; |
| 271 | |
| 272 | case DR_TPDU_type: |
| 273 | if( hdr->tpdu_DRdref == 0 ) { |
| 274 | /* don't issue the DR */ |
| 275 | goto done; |
| 276 | } |
| 277 | hdr->tpdu_cdt = 0; |
| 278 | hdr->tpdu_DRsref = htons(tpcb->tp_lref); |
| 279 | hdr->tpdu_DRreason = (u_char)eot; /* WHICH BYTE OF THIS??? */ |
| 280 | |
| 281 | /* forget the add'l information variable part */ |
| 282 | IncStat(ts_DR_sent); |
| 283 | break; |
| 284 | |
| 285 | case DC_TPDU_type: /* not used in class 0 */ |
| 286 | ASSERT( tpcb->tp_class != TP_CLASS_0); |
| 287 | hdr->tpdu_DCsref = htons(tpcb->tp_lref); |
| 288 | hdr->tpdu_cdt = 0; |
| 289 | data = (struct mbuf *)0; |
| 290 | IncStat(ts_DC_sent); |
| 291 | break; |
| 292 | |
| 293 | case XAK_TPDU_type: /* xak not used in class 0 */ |
| 294 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ |
| 295 | hdr->tpdu_cdt = 0; |
| 296 | |
| 297 | IFTRACE(D_XPD) |
| 298 | tptraceTPCB(TPPTXack, seq, 0, 0, 0, 0); |
| 299 | ENDTRACE |
| 300 | data = (struct mbuf *)0; |
| 301 | if (tpcb->tp_xtd_format) { |
| 302 | #ifdef BYTE_ORDER |
| 303 | hdr->tpdu_XAKseqX = htonl(seq); |
| 304 | #else |
| 305 | hdr->tpdu_XAKseqX = seq; |
| 306 | #endif BYTE_ORDER |
| 307 | } else { |
| 308 | hdr->tpdu_XAKseq = seq; |
| 309 | } |
| 310 | IncStat(ts_XAK_sent); |
| 311 | IncPStat(tpcb, tps_XAK_sent); |
| 312 | break; |
| 313 | |
| 314 | case XPD_TPDU_type: /* xpd not used in class 0 */ |
| 315 | ASSERT( tpcb->tp_class != TP_CLASS_0); /* fall through */ |
| 316 | hdr->tpdu_cdt = 0; |
| 317 | if (tpcb->tp_xtd_format) { |
| 318 | #ifdef BYTE_ORDER |
| 319 | union seq_type seqeotX; |
| 320 | |
| 321 | seqeotX.s_seq = seq; |
| 322 | seqeotX.s_eot = 1; |
| 323 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); |
| 324 | #else |
| 325 | hdr->tpdu_XPDseqX = seq; |
| 326 | hdr->tpdu_XPDeotX = 1; /* always 1 for XPD tpdu */ |
| 327 | #endif BYTE_ORDER |
| 328 | } else { |
| 329 | hdr->tpdu_XPDseq = seq; |
| 330 | hdr->tpdu_XPDeot = 1; /* always 1 for XPD tpdu */ |
| 331 | } |
| 332 | IncStat(ts_XPD_sent); |
| 333 | IncPStat(tpcb, tps_XPD_sent); |
| 334 | |
| 335 | /* kludge to test the input size checking */ |
| 336 | IFDEBUG(D_SIZE_CHECK) |
| 337 | if(data->m_len <= 16 && data->m_off < (MLEN-18) ) { |
| 338 | printf("Sending too much data on XPD: 18 bytes\n"); |
| 339 | data->m_len = 18; |
| 340 | } |
| 341 | ENDDEBUG |
| 342 | break; |
| 343 | |
| 344 | case DT_TPDU_type: |
| 345 | hdr->tpdu_cdt = 0; |
| 346 | IFTRACE(D_DATA) |
| 347 | tptraceTPCB(TPPTmisc, "emit DT: eot seq tpdu_li", eot, seq, |
| 348 | hdr->tpdu_li, 0); |
| 349 | ENDTRACE |
| 350 | if (tpcb->tp_xtd_format) { |
| 351 | #ifdef BYTE_ORDER |
| 352 | union seq_type seqeotX; |
| 353 | |
| 354 | seqeotX.s_seq = seq; |
| 355 | seqeotX.s_eot = eot; |
| 356 | hdr->tpdu_seqeotX = htonl(seqeotX.s_seqeot); |
| 357 | #else |
| 358 | hdr->tpdu_DTseqX = seq; |
| 359 | hdr->tpdu_DTeotX = eot; |
| 360 | #endif BYTE_ORDER |
| 361 | } else if (tpcb->tp_class == TP_CLASS_0) { |
| 362 | IFDEBUG(D_EMIT) |
| 363 | printf("DT tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); |
| 364 | dump_buf( hdr, hdr->tpdu_li + 1 ); |
| 365 | ENDDEBUG |
| 366 | ((struct tp0du *)hdr)->tp0du_eot = eot; |
| 367 | ((struct tp0du *)hdr)->tp0du_mbz = 0; |
| 368 | IFDEBUG(D_EMIT) |
| 369 | printf("DT 2 tpdu: class 0 m 0x%x hdr 0x%x\n", m, hdr); |
| 370 | dump_buf( hdr, hdr->tpdu_li + 1 ); |
| 371 | ENDDEBUG |
| 372 | } else { |
| 373 | hdr->tpdu_DTseq = seq; |
| 374 | hdr->tpdu_DTeot = eot; |
| 375 | } |
| 376 | if(eot) { |
| 377 | IncStat(ts_EOT_sent); |
| 378 | } |
| 379 | IncStat(ts_DT_sent); |
| 380 | IncPStat(tpcb, tps_DT_sent); |
| 381 | break; |
| 382 | |
| 383 | case AK_TPDU_type:/* ak not used in class 0 */ |
| 384 | ASSERT( tpcb->tp_class != TP_CLASS_0); |
| 385 | data = (struct mbuf *)0; |
| 386 | { SeqNum olduwe = tpcb->tp_sent_uwe; |
| 387 | |
| 388 | tpcb->tp_sent_uwe = |
| 389 | SEQ(tpcb,tpcb->tp_rcvnxt + tpcb->tp_lcredit -1); |
| 390 | LOCAL_CREDIT( tpcb ); |
| 391 | tpcb->tp_sent_lcdt = tpcb->tp_lcredit; |
| 392 | |
| 393 | IFDEBUG(D_RENEG) |
| 394 | /* occasionally fake a reneging so |
| 395 | you can test subsequencing */ |
| 396 | if( olduwe & 0x1 ) { |
| 397 | tpcb->tp_reneged = 1; |
| 398 | IncStat(ts_ldebug); |
| 399 | } |
| 400 | ENDDEBUG |
| 401 | /* Are we about to reneg on credit? |
| 402 | * When might we do so? |
| 403 | * a) when using optimistic credit (which we no longer do). |
| 404 | * b) when drain() gets implemented (not in the plans). |
| 405 | * c) when D_RENEG is on. |
| 406 | * d) when DEC BIT response (PRC_QUENCH2) is implemented. |
| 407 | * (not- when we do this, we'll need to implement flow control |
| 408 | * confirmation) |
| 409 | */ |
| 410 | if( SEQ_LT(tpcb, tpcb->tp_sent_uwe, olduwe) ) { |
| 411 | tpcb->tp_reneged = 1; |
| 412 | IncStat(ts_lcdt_reduced); |
| 413 | IFTRACE(D_CREDIT) |
| 414 | tptraceTPCB(TPPTmisc, |
| 415 | "RENEG: olduwe newuwe lcredit rcvnxt", |
| 416 | olduwe, |
| 417 | tpcb->tp_sent_uwe, tpcb->tp_lcredit, |
| 418 | tpcb->tp_rcvnxt); |
| 419 | ENDTRACE |
| 420 | } |
| 421 | |
| 422 | IFPERF(tpcb) |
| 423 | /* new lwe is less than old uwe means we're |
| 424 | * acking before we received a whole window full |
| 425 | */ |
| 426 | if( SEQ_LT( tpcb, tpcb->tp_rcvnxt, olduwe) ) { |
| 427 | /* tmp1 = number of pkts fewer than the full window */ |
| 428 | register int tmp1 = |
| 429 | (int) SEQ_SUB( tpcb, olduwe, tpcb->tp_rcvnxt); |
| 430 | |
| 431 | if(tmp1 > TP_PM_MAX) |
| 432 | tmp1 = TP_PM_MAX; |
| 433 | IncPStat( tpcb, tps_ack_early[tmp1] ); |
| 434 | |
| 435 | /* tmp1 = amt of new cdt we're advertising */ |
| 436 | tmp1 = SEQ_SUB( tpcb, seq, tpcb->tp_sent_rcvnxt); |
| 437 | if(tmp1 > TP_PM_MAX ) |
| 438 | tmp1 = TP_PM_MAX; |
| 439 | |
| 440 | IncPStat( tpcb, |
| 441 | tps_cdt_acked [ tmp1 ] |
| 442 | [ ((tpcb->tp_lcredit > TP_PM_MAX)? |
| 443 | TP_PM_MAX:tpcb->tp_lcredit) ] ); |
| 444 | |
| 445 | } |
| 446 | ENDPERF |
| 447 | } |
| 448 | IFTRACE(D_ACKSEND) |
| 449 | tptraceTPCB(TPPTack, seq, tpcb->tp_lcredit, tpcb->tp_sent_uwe, |
| 450 | tpcb->tp_r_subseq, 0); |
| 451 | ENDTRACE |
| 452 | if (tpcb->tp_xtd_format) { |
| 453 | #ifdef BYTE_ORDER |
| 454 | hdr->tpdu_cdt = 0; |
| 455 | hdr->tpdu_AKseqX = htonl(seq); |
| 456 | hdr->tpdu_AKcdtX = htons(tpcb->tp_lcredit); |
| 457 | #else |
| 458 | hdr->tpdu_cdt = 0; |
| 459 | hdr->tpdu_AKseqX = seq; |
| 460 | hdr->tpdu_AKcdtX = tpcb->tp_lcredit; |
| 461 | #endif BYTE_ORDER |
| 462 | } else { |
| 463 | hdr->tpdu_AKseq = seq; |
| 464 | hdr->tpdu_AKcdt = tpcb->tp_lcredit; |
| 465 | } |
| 466 | if ((tpcb->tp_class == TP_CLASS_4) && tpcb->tp_reneged ) { |
| 467 | /* |
| 468 | * Ack subsequence parameter req'd if WE reneged on |
| 469 | * credit offered. (ISO 8073, 12.2.3.8.2, p. 74) |
| 470 | */ |
| 471 | IFDEBUG(D_RENEG) |
| 472 | printf("Adding subseq 0x%x\n", tpcb->tp_s_subseq); |
| 473 | ENDDEBUG |
| 474 | tpcb->tp_s_subseq++; |
| 475 | /* |
| 476 | * add tmp subseq and do a htons on it. |
| 477 | */ |
| 478 | ADDOPTION(TPP_subseq, hdr, |
| 479 | sizeof(tpcb->tp_s_subseq), tpcb->tp_s_subseq); |
| 480 | } else |
| 481 | tpcb->tp_s_subseq = 0; |
| 482 | |
| 483 | if ( tpcb->tp_sendfcc || eot ) /* overloaded to mean SEND FCC */ { |
| 484 | /* |
| 485 | * Rules for sending FCC ("should" send when) : |
| 486 | * %a) received an ack from peer with NO NEWS whatsoever, |
| 487 | * and it did not contain an FCC |
| 488 | * b) received an ack from peer that opens its closed window. |
| 489 | * c) received an ack from peer after it reneged on its |
| 490 | * offered credit, AND this ack raises UWE but LWE is same |
| 491 | * and below UWE at time of reneging (reduction) |
| 492 | * Now, ISO 8073 12.2.3.8.3 says |
| 493 | * that a retransmitted AK shall not contain the FCC |
| 494 | * parameter. Now, how the hell you tell the difference |
| 495 | * between a retransmitted ack and an ack that's sent in |
| 496 | * response to a received ack, I don't know, because without |
| 497 | * any local activity, and w/o any received DTs, they |
| 498 | * will contain exactly the same credit/seq# information. |
| 499 | * Anyway, given that the "retransmission of acks" |
| 500 | * procedure (ISO 8073 12.2.3.8.3) is optional, and we |
| 501 | * don't do it (although the peer can't tell that), we |
| 502 | * ignore this last rule. |
| 503 | * |
| 504 | * We send FCC for reasons a) and b) only. |
| 505 | * To add reason c) would require a ridiculous amount of state. |
| 506 | * |
| 507 | */ |
| 508 | u_short bogus[4]; /* lwe(32), subseq(16), cdt(16) */ |
| 509 | SeqNum lwe; |
| 510 | u_short subseq, fcredit; |
| 511 | |
| 512 | tpcb->tp_sendfcc = 0; |
| 513 | |
| 514 | lwe = (SeqNum) htonl(tpcb->tp_snduna); |
| 515 | subseq = htons(tpcb->tp_r_subseq); |
| 516 | fcredit = htons(tpcb->tp_fcredit); |
| 517 | |
| 518 | bcopy((caddr_t) &lwe, &bogus[0], sizeof(SeqNum)); |
| 519 | bcopy((caddr_t) &subseq, &bogus[2], sizeof(u_short)); |
| 520 | bcopy((caddr_t) &fcredit, &bogus[3], sizeof(u_short)); |
| 521 | |
| 522 | IFTRACE(D_ACKSEND) |
| 523 | tptraceTPCB(TPPTmisc, |
| 524 | "emit w/FCC: snduna r_subseq fcredit", |
| 525 | tpcb->tp_snduna, tpcb->tp_r_subseq, |
| 526 | tpcb->tp_fcredit, 0); |
| 527 | ENDTRACE |
| 528 | |
| 529 | IFDEBUG(D_ACKSEND) |
| 530 | printf("Calling ADDOPTION 0x%x, 0x%x, 0x%x,0x%x\n", |
| 531 | TPP_flow_cntl_conf, |
| 532 | hdr, sizeof(bogus), bogus[0]); |
| 533 | ENDDEBUG |
| 534 | ADDOPTION(TPP_flow_cntl_conf, hdr, sizeof(bogus), bogus[0]); |
| 535 | IFDEBUG(D_ACKSEND) |
| 536 | printf("after ADDOPTION hdr 0x%x hdr->tpdu_li 0x%x\n", |
| 537 | hdr, hdr->tpdu_li); |
| 538 | printf( |
| 539 | "after ADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", |
| 540 | csum_offset, hdr->tpdu_li); |
| 541 | ENDDEBUG |
| 542 | |
| 543 | } |
| 544 | tpcb->tp_reneged = 0; |
| 545 | tpcb->tp_sent_rcvnxt = seq; |
| 546 | tp_ctimeout(tpcb->tp_refp, TM_sendack, |
| 547 | (int)tpcb->tp_keepalive_ticks); |
| 548 | IncStat(ts_AK_sent); |
| 549 | IncPStat(tpcb, tps_AK_sent); |
| 550 | IFDEBUG(D_ACKSEND) |
| 551 | printf( |
| 552 | "2 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", |
| 553 | csum_offset, hdr->tpdu_li); |
| 554 | ENDDEBUG |
| 555 | break; |
| 556 | |
| 557 | case ER_TPDU_type: |
| 558 | hdr->tpdu_ERreason = eot; |
| 559 | hdr->tpdu_cdt = 0; |
| 560 | /* no user data */ |
| 561 | data = (struct mbuf *)0; |
| 562 | IncStat(ts_ER_sent); |
| 563 | break; |
| 564 | } |
| 565 | |
| 566 | } |
| 567 | ASSERT( ((int)hdr->tpdu_li > 0) && ((int)hdr->tpdu_li < MLEN) ); |
| 568 | |
| 569 | m->m_next = data; |
| 570 | |
| 571 | ASSERT( hdr->tpdu_li < MMAXOFF ); /* leave this in */ |
| 572 | ASSERT( hdr->tpdu_li != 0 ); /* leave this in */ |
| 573 | |
| 574 | m->m_len = hdr->tpdu_li ; |
| 575 | hdr->tpdu_li --; /* doesn't include the li field */ |
| 576 | |
| 577 | datalen = m_datalen( m ); /* total len */ |
| 578 | |
| 579 | ASSERT( datalen <= tpcb->tp_l_tpdusize ); /* may become a problem |
| 580 | when CLNP is used; leave in here for the time being */ |
| 581 | IFDEBUG(D_ACKSEND) |
| 582 | printf( |
| 583 | "4 after rADDOPTION csum_offset 0x%x, hdr->tpdu_li 0x%x\n", |
| 584 | csum_offset, hdr->tpdu_li); |
| 585 | ENDDEBUG |
| 586 | if( datalen > tpcb->tp_l_tpdusize ) { |
| 587 | printf("data len 0x%x tpcb->tp_l_tpdusize 0x%x\n", |
| 588 | datalen, tpcb->tp_l_tpdusize); |
| 589 | } |
| 590 | IFDEBUG(D_EMIT) |
| 591 | printf( |
| 592 | "tp_emit before gen_csum m_len 0x%x, csum_offset 0x%x, datalen 0x%x\n", |
| 593 | m->m_len, csum_offset, datalen); |
| 594 | ENDDEBUG |
| 595 | if( tpcb->tp_use_checksum || |
| 596 | (dutype == CR_TPDU_type && (tpcb->tp_class & TP_CLASS_4)) ) { |
| 597 | iso_gen_csum(m, csum_offset, datalen); |
| 598 | } |
| 599 | |
| 600 | IFDEBUG(D_EMIT) |
| 601 | printf("tp_emit before tpxxx_output tpcb 0x%x, dutype 0x%x, datalen 0x%x\n", |
| 602 | tpcb, dutype, datalen); |
| 603 | dump_buf( m, datalen+12); |
| 604 | ENDDEBUG |
| 605 | |
| 606 | IFPERF(tpcb) |
| 607 | if( dutype == DT_TPDU_type ) { |
| 608 | PStat(tpcb, Nb_to_ll) += (datalen - m->m_len); |
| 609 | tpmeas( tpcb->tp_lref, TPtime_to_ll, 0, |
| 610 | seq, PStat(tpcb, Nb_to_ll), (datalen - m->m_len)); |
| 611 | } |
| 612 | ENDPERF |
| 613 | |
| 614 | IFTRACE(D_EMIT) |
| 615 | tptraceTPCB(TPPTtpduout, dutype, hdr, hdr->tpdu_li+1, datalen, 0); |
| 616 | ENDTRACE |
| 617 | IFDEBUG(D_EMIT) |
| 618 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", |
| 619 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); |
| 620 | ENDDEBUG |
| 621 | |
| 622 | { extern char tp_delay; |
| 623 | |
| 624 | if( tp_delay ) |
| 625 | if( tpcb->tp_use_checksum == 0 ) { |
| 626 | register u_int i = tp_delay; |
| 627 | for (; i!= 0; i--) |
| 628 | (void) iso_check_csum(m, datalen); |
| 629 | } |
| 630 | } |
| 631 | ASSERT( m->m_len > 0 ); |
| 632 | error = (tpcb->tp_nlproto->nlp_output)(tpcb->tp_npcb, m, datalen, |
| 633 | !tpcb->tp_use_checksum); |
| 634 | IFDEBUG(D_EMIT) |
| 635 | printf("OUTPUT: returned 0x%x\n", error); |
| 636 | ENDDEBUG |
| 637 | IFTRACE(D_EMIT) |
| 638 | tptraceTPCB(TPPTmisc, |
| 639 | "tp_emit nlproto->output netservice returns datalen", |
| 640 | tpcb->tp_nlproto->nlp_output, tpcb->tp_netservice, error, datalen); |
| 641 | ENDTRACE |
| 642 | done: |
| 643 | if( error == E_CO_QFULL ) { |
| 644 | tp_quench( tpcb ); |
| 645 | return 0; |
| 646 | } |
| 647 | return error; |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * NAME: tp_error_emit() |
| 652 | * CALLED FROM: tp_input() when a DR or ER is to be issued in |
| 653 | * response to an input error. |
| 654 | * FUNCTION and ARGUMENTS: |
| 655 | * The error type is the first argument. |
| 656 | * The argument (sref) is the source reference on the bad incoming tpdu, |
| 657 | * and is used for a destination reference on the outgoing packet. |
| 658 | * (faddr) and (laddr) are the foreign and local addresses for this |
| 659 | * connection. |
| 660 | * (erdata) is a ptr to the errant incoming tpdu, and is copied into the |
| 661 | * outgoing ER, if an ER is to be issued. |
| 662 | * (erlen) is the number of octets of the errant tpdu that we should |
| 663 | * try to copy. |
| 664 | * (tpcb) is the pcb that describes the connection for which the bad tpdu |
| 665 | * arrived. |
| 666 | * RETURN VALUES: |
| 667 | * 0 OK |
| 668 | * ENOBUFS |
| 669 | * E* from net layer datagram output routine |
| 670 | * SIDE EFFECTS: |
| 671 | * |
| 672 | * NOTES: |
| 673 | */ |
| 674 | |
| 675 | int |
| 676 | tp_error_emit(error, sref, faddr, laddr, erdata, erlen, tpcb, cons_channel, |
| 677 | dgout_routine) |
| 678 | int error; |
| 679 | u_long sref; |
| 680 | struct sockaddr_iso *faddr, *laddr; |
| 681 | struct mbuf *erdata; |
| 682 | int erlen; |
| 683 | struct tp_pcb *tpcb; |
| 684 | int cons_channel; |
| 685 | int (*dgout_routine)(); |
| 686 | { |
| 687 | int dutype; |
| 688 | int datalen = 0; |
| 689 | register struct tpdu *hdr; |
| 690 | register struct mbuf *m; |
| 691 | int csum_offset; |
| 692 | |
| 693 | IFTRACE(D_ERROR_EMIT) |
| 694 | tptrace(TPPTmisc, "tp_error_emit error sref tpcb erlen", |
| 695 | error, sref, tpcb, erlen); |
| 696 | ENDTRACE |
| 697 | IFDEBUG(D_ERROR_EMIT) |
| 698 | printf( |
| 699 | "tp_error_emit error 0x%x sref 0x%x tpcb 0x%x erlen 0x%x chan 0x%x\n", |
| 700 | error, sref, tpcb, erlen, cons_channel); |
| 701 | ENDDEBUG |
| 702 | |
| 703 | MGET(m, M_DONTWAIT, TPMT_TPHDR); |
| 704 | if (m == NULL) { |
| 705 | return ENOBUFS; |
| 706 | } |
| 707 | m->m_len = sizeof(struct tpdu); |
| 708 | m->m_act = MNULL; |
| 709 | |
| 710 | hdr = mtod(m, struct tpdu *); |
| 711 | |
| 712 | IFDEBUG(D_ERROR_EMIT) |
| 713 | printf("[error 0x%x] [error&0xff 0x%x] [(char)error 0x%x]\n", |
| 714 | error, error&0xff, (char)error); |
| 715 | ENDDEBUG |
| 716 | |
| 717 | error &= 0xff; |
| 718 | |
| 719 | if( error & 0x40 ) { |
| 720 | error &= ~0x40; |
| 721 | dutype = ER_TPDU_type; |
| 722 | } else |
| 723 | dutype = DR_TPDU_type; |
| 724 | |
| 725 | hdr->tpdu_type = dutype; |
| 726 | hdr->tpdu_cdt = 0; |
| 727 | |
| 728 | switch( dutype ) { |
| 729 | |
| 730 | case DR_TPDU_type: |
| 731 | IncStat(ts_DR_sent); |
| 732 | hdr->tpdu_li = 7; |
| 733 | hdr->tpdu_DRdref = htons(sref); |
| 734 | hdr->tpdu_DRsref = htons(0); |
| 735 | hdr->tpdu_DRreason = (char)error; |
| 736 | IFDEBUG(D_ERROR_EMIT) |
| 737 | printf("DR case:\n"); |
| 738 | dump_buf( hdr, 7); |
| 739 | ENDDEBUG |
| 740 | /* forget the add'l information variable part */ |
| 741 | break; |
| 742 | |
| 743 | case ER_TPDU_type: |
| 744 | IncStat(ts_ER_sent); |
| 745 | hdr->tpdu_li = 5; |
| 746 | hdr->tpdu_ERreason = (char)error; |
| 747 | break; |
| 748 | |
| 749 | default: |
| 750 | ASSERT(0); |
| 751 | printf("TP PANIC: bad dutype 0x%x\n", dutype); |
| 752 | } |
| 753 | |
| 754 | if(tpcb) |
| 755 | if( tpcb->tp_use_checksum ) { |
| 756 | ADDOPTION(TPP_checksum, hdr, 2, csum_offset /* dummy argument */); |
| 757 | csum_offset = hdr->tpdu_li - 2; |
| 758 | } |
| 759 | |
| 760 | ASSERT( hdr->tpdu_li < MMAXOFF ); |
| 761 | |
| 762 | if (dutype == ER_TPDU_type) { |
| 763 | /* copy the errant tpdu into another 'variable part' */ |
| 764 | register caddr_t P; |
| 765 | |
| 766 | IFTRACE(D_ERROR_EMIT) |
| 767 | tptrace(TPPTmisc, "error_emit ER len tpduli", erlen, hdr->tpdu_li, |
| 768 | 0,0); |
| 769 | ENDTRACE |
| 770 | IFDEBUG(D_ERROR_EMIT) |
| 771 | printf("error_emit ER len 0x%x tpduli 0x%x\n", erlen, hdr->tpdu_li); |
| 772 | ENDDEBUG |
| 773 | |
| 774 | /* copy at most as many octets for which you have room */ |
| 775 | if (erlen + hdr->tpdu_li + 2 > TP_MAX_HEADER_LEN) |
| 776 | erlen = TP_MAX_HEADER_LEN - hdr->tpdu_li - 2; |
| 777 | |
| 778 | /* add the "invalid tpdu" parameter : required in class 0 */ |
| 779 | P = (caddr_t)hdr + (int)(hdr->tpdu_li); |
| 780 | vbptr(P)->tpv_code = TPP_invalid_tpdu; /* parameter code */ |
| 781 | vbptr(P)->tpv_len = erlen; /* parameter length */ |
| 782 | m->m_len = hdr->tpdu_li + 2; /* 1 for code, 1 for length */ |
| 783 | |
| 784 | /* tp_input very likely handed us an mbuf chain w/ nothing in |
| 785 | * the first mbuf and the data following the empty mbuf |
| 786 | */ |
| 787 | if(erdata->m_len == 0) { |
| 788 | erdata = m_free(erdata); /* returns the next mbuf on the chain */ |
| 789 | } |
| 790 | m->m_next = m_copy(erdata, 0, erlen); /* copy only up to the |
| 791 | bad octet (or max that will fit in a header */ |
| 792 | hdr->tpdu_li += erlen + 2; |
| 793 | m_freem(erdata); |
| 794 | } else { |
| 795 | IFDEBUG(D_ERROR_EMIT) |
| 796 | printf("error_emit DR error tpduli 0x%x\n", error, hdr->tpdu_li); |
| 797 | dump_buf( (char *)hdr, hdr->tpdu_li ); |
| 798 | ENDDEBUG |
| 799 | m->m_len = hdr->tpdu_li ; |
| 800 | m_freem(erdata); |
| 801 | } |
| 802 | |
| 803 | hdr->tpdu_li --; |
| 804 | IFTRACE(D_ERROR_EMIT) |
| 805 | tptrace(TPPTtpduout, 2, hdr, hdr->tpdu_li+1, 0, 0); |
| 806 | ENDTRACE |
| 807 | |
| 808 | datalen = m_datalen( m); |
| 809 | |
| 810 | if(tpcb) { |
| 811 | if( tpcb->tp_use_checksum ) { |
| 812 | IFTRACE(D_ERROR_EMIT) |
| 813 | tptrace(TPPTmisc, "before gen csum datalen", datalen,0,0,0); |
| 814 | ENDTRACE |
| 815 | IFDEBUG(D_ERROR_EMIT) |
| 816 | printf("before gen csum datalen 0x%x, csum_offset 0x%x\n", |
| 817 | datalen, csum_offset); |
| 818 | ENDDEBUG |
| 819 | |
| 820 | iso_gen_csum(m, csum_offset, datalen); |
| 821 | } |
| 822 | |
| 823 | IFDEBUG(D_ERROR_EMIT) |
| 824 | printf("OUTPUT: tpcb 0x%x, isop 0x%x, so 0x%x\n", |
| 825 | tpcb, tpcb->tp_npcb, tpcb->tp_sock); |
| 826 | ENDDEBUG |
| 827 | /* Problem: if packet comes in on ISO but sock is listening |
| 828 | * in INET, this assertion will fail. |
| 829 | * Have to believe the argument, not the nlp_proto. |
| 830 | ASSERT( tpcb->tp_nlproto->nlp_dgoutput == dgout_routine ); |
| 831 | */ |
| 832 | |
| 833 | IFDEBUG(D_ERROR_EMIT) |
| 834 | printf("tp_error_emit 1 sending DG: Laddr\n"); |
| 835 | dump_isoaddr( laddr ); |
| 836 | printf("Faddr\n"); |
| 837 | dump_isoaddr( faddr ); |
| 838 | ENDDEBUG |
| 839 | return (tpcb->tp_nlproto->nlp_dgoutput)( |
| 840 | &laddr->siso_addr, |
| 841 | &faddr->siso_addr, |
| 842 | m, datalen, |
| 843 | /* no route */ (caddr_t)0, !tpcb->tp_use_checksum); |
| 844 | } else { |
| 845 | if( cons_channel ) { |
| 846 | #if NARGOXTWENTYFIVE > 0 |
| 847 | #include "../netiso/cons.h" |
| 848 | /* This is unfortunate... |
| 849 | cons_send_on_vc(cons_channel, m, datalen); |
| 850 | */ |
| 851 | cons_netcmd( CONN_CLOSE, (struct isopcb *)0, |
| 852 | cons_channel, CONS_NOT_DGM); |
| 853 | IFDEBUG(D_ERROR_EMIT) |
| 854 | printf("OUTPUT: dutype 0x%x channel 0x%x\n", |
| 855 | dutype, cons_channel); |
| 856 | ENDDEBUG |
| 857 | #else NARGOXTWENTYFIVE |
| 858 | printf("TP panic! cons channel 0x%x but not cons configured\n", |
| 859 | cons_channel); |
| 860 | #endif NARGOXTWENTYFIVE > 0 |
| 861 | } else { |
| 862 | #ifndef nodef |
| 863 | IFDEBUG(D_ERROR_EMIT) |
| 864 | printf("tp_error_emit sending DG: Laddr\n"); |
| 865 | dump_isoaddr( laddr ); |
| 866 | printf("Faddr\n"); |
| 867 | dump_isoaddr( laddr ); |
| 868 | ENDDEBUG |
| 869 | return (*dgout_routine)( &laddr->siso_addr, &faddr->siso_addr, |
| 870 | m, datalen, /* no route */ |
| 871 | (caddr_t)0, /* nochecksum==false */0); |
| 872 | #else nodef |
| 873 | IFDEBUG(D_ERROR_EMIT) |
| 874 | printf("tp_error_emit DROPPING \n", m); |
| 875 | ENDDEBUG |
| 876 | IncStat(ts_send_drop); |
| 877 | m_freem(m); |
| 878 | return 0; |
| 879 | #endif nodef |
| 880 | } |
| 881 | } |
| 882 | } |