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sys/netns/spp_usrreq.c
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1 /* 2 * Copyright (c) 1984, 1985, 1986, 1987, 1993 3 * The Regents of the University of California. 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 * 33 * @(#)spp_usrreq.c 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: src/sys/netns/spp_usrreq.c,v 1.8.2.1 1999/09/05 08:19:31 peter Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/errno.h> 45 46 #include <net/if.h> 47 #include <net/route.h> 48 #include <netinet/tcp_fsm.h> 49 50 #include <netns/ns.h> 51 #include <netns/ns_pcb.h> 52 #include <netns/idp.h> 53 #include <netns/idp_var.h> 54 #include <netns/ns_error.h> 55 #include <netns/sp.h> 56 #include <netns/spidp.h> 57 #include <netns/spp_timer.h> 58 #include <netns/spp_var.h> 59 #include <netns/spp_debug.h> 60 61 /* 62 * SP protocol implementation. 63 */ 64 spp_init() 65 { 66 67 spp_iss = 1; /* WRONG !! should fish it out of TODR */ 68 } 69 struct spidp spp_savesi; 70 int traceallspps = 0; 71 extern int sppconsdebug; 72 int spp_hardnosed; 73 int spp_use_delack = 0; 74 u_short spp_newchecks[50]; 75 76 /*ARGSUSED*/ 77 spp_input(m, nsp) 78 register struct mbuf *m; 79 register struct nspcb *nsp; 80 { 81 register struct sppcb *cb; 82 register struct spidp *si = mtod(m, struct spidp *); 83 register struct socket *so; 84 short ostate; 85 int dropsocket = 0; 86 87 88 sppstat.spps_rcvtotal++; 89 if (nsp == 0) { 90 panic("No nspcb in spp_input"); 91 return; 92 } 93 94 cb = nstosppcb(nsp); 95 if (cb == 0) goto bad; 96 97 if (m->m_len < sizeof(*si)) { 98 if ((m = m_pullup(m, sizeof(*si))) == 0) { 99 sppstat.spps_rcvshort++; 100 return; 101 } 102 si = mtod(m, struct spidp *); 103 } 104 si->si_seq = ntohs(si->si_seq); 105 si->si_ack = ntohs(si->si_ack); 106 si->si_alo = ntohs(si->si_alo); 107 108 so = nsp->nsp_socket; 109 if (so->so_options & SO_DEBUG || traceallspps) { 110 ostate = cb->s_state; 111 spp_savesi = *si; 112 } 113 if (so->so_options & SO_ACCEPTCONN) { 114 struct sppcb *ocb = cb; 115 116 so = sonewconn(so, 0); 117 if (so == 0) { 118 goto drop; 119 } 120 /* 121 * This is ugly, but .... 122 * 123 * Mark socket as temporary until we're 124 * committed to keeping it. The code at 125 * ``drop'' and ``dropwithreset'' check the 126 * flag dropsocket to see if the temporary 127 * socket created here should be discarded. 128 * We mark the socket as discardable until 129 * we're committed to it below in TCPS_LISTEN. 130 */ 131 dropsocket++; 132 nsp = (struct nspcb *)so->so_pcb; 133 nsp->nsp_laddr = si->si_dna; 134 cb = nstosppcb(nsp); 135 cb->s_mtu = ocb->s_mtu; /* preserve sockopts */ 136 cb->s_flags = ocb->s_flags; /* preserve sockopts */ 137 cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */ 138 cb->s_state = TCPS_LISTEN; 139 } 140 141 /* 142 * Packet received on connection. 143 * reset idle time and keep-alive timer; 144 */ 145 cb->s_idle = 0; 146 cb->s_timer[SPPT_KEEP] = SPPTV_KEEP; 147 148 switch (cb->s_state) { 149 150 case TCPS_LISTEN:{ 151 struct mbuf *am; 152 register struct sockaddr_ns *sns; 153 struct ns_addr laddr; 154 155 /* 156 * If somebody here was carying on a conversation 157 * and went away, and his pen pal thinks he can 158 * still talk, we get the misdirected packet. 159 */ 160 if (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) { 161 spp_istat.gonawy++; 162 goto dropwithreset; 163 } 164 am = m_get(M_DONTWAIT, MT_SONAME); 165 if (am == NULL) 166 goto drop; 167 am->m_len = sizeof (struct sockaddr_ns); 168 sns = mtod(am, struct sockaddr_ns *); 169 sns->sns_len = sizeof(*sns); 170 sns->sns_family = AF_NS; 171 sns->sns_addr = si->si_sna; 172 laddr = nsp->nsp_laddr; 173 if (ns_nullhost(laddr)) 174 nsp->nsp_laddr = si->si_dna; 175 if (ns_pcbconnect(nsp, am)) { 176 nsp->nsp_laddr = laddr; 177 (void) m_free(am); 178 spp_istat.noconn++; 179 goto drop; 180 } 181 (void) m_free(am); 182 spp_template(cb); 183 dropsocket = 0; /* committed to socket */ 184 cb->s_did = si->si_sid; 185 cb->s_rack = si->si_ack; 186 cb->s_ralo = si->si_alo; 187 #define THREEWAYSHAKE 188 #ifdef THREEWAYSHAKE 189 cb->s_state = TCPS_SYN_RECEIVED; 190 cb->s_force = 1 + SPPT_KEEP; 191 sppstat.spps_accepts++; 192 cb->s_timer[SPPT_KEEP] = SPPTV_KEEP; 193 } 194 break; 195 /* 196 * This state means that we have heard a response 197 * to our acceptance of their connection 198 * It is probably logically unnecessary in this 199 * implementation. 200 */ 201 case TCPS_SYN_RECEIVED: { 202 if (si->si_did!=cb->s_sid) { 203 spp_istat.wrncon++; 204 goto drop; 205 } 206 #endif 207 nsp->nsp_fport = si->si_sport; 208 cb->s_timer[SPPT_REXMT] = 0; 209 cb->s_timer[SPPT_KEEP] = SPPTV_KEEP; 210 soisconnected(so); 211 cb->s_state = TCPS_ESTABLISHED; 212 sppstat.spps_accepts++; 213 } 214 break; 215 216 /* 217 * This state means that we have gotten a response 218 * to our attempt to establish a connection. 219 * We fill in the data from the other side, 220 * telling us which port to respond to, instead of the well- 221 * known one we might have sent to in the first place. 222 * We also require that this is a response to our 223 * connection id. 224 */ 225 case TCPS_SYN_SENT: 226 if (si->si_did!=cb->s_sid) { 227 spp_istat.notme++; 228 goto drop; 229 } 230 sppstat.spps_connects++; 231 cb->s_did = si->si_sid; 232 cb->s_rack = si->si_ack; 233 cb->s_ralo = si->si_alo; 234 cb->s_dport = nsp->nsp_fport = si->si_sport; 235 cb->s_timer[SPPT_REXMT] = 0; 236 cb->s_flags |= SF_ACKNOW; 237 soisconnected(so); 238 cb->s_state = TCPS_ESTABLISHED; 239 /* Use roundtrip time of connection request for initial rtt */ 240 if (cb->s_rtt) { 241 cb->s_srtt = cb->s_rtt << 3; 242 cb->s_rttvar = cb->s_rtt << 1; 243 SPPT_RANGESET(cb->s_rxtcur, 244 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1, 245 SPPTV_MIN, SPPTV_REXMTMAX); 246 cb->s_rtt = 0; 247 } 248 } 249 if (so->so_options & SO_DEBUG || traceallspps) 250 spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0); 251 252 m->m_len -= sizeof (struct idp); 253 m->m_pkthdr.len -= sizeof (struct idp); 254 m->m_data += sizeof (struct idp); 255 256 if (spp_reass(cb, si)) { 257 (void) m_freem(m); 258 } 259 if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT))) 260 (void) spp_output(cb, (struct mbuf *)0); 261 cb->s_flags &= ~(SF_WIN|SF_RXT); 262 return; 263 264 dropwithreset: 265 if (dropsocket) 266 (void) soabort(so); 267 si->si_seq = ntohs(si->si_seq); 268 si->si_ack = ntohs(si->si_ack); 269 si->si_alo = ntohs(si->si_alo); 270 ns_error(dtom(si), NS_ERR_NOSOCK, 0); 271 if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps) 272 spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); 273 return; 274 275 drop: 276 bad: 277 if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || 278 traceallspps) 279 spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); 280 m_freem(m); 281 } 282 283 int spprexmtthresh = 3; 284 285 /* 286 * This is structurally similar to the tcp reassembly routine 287 * but its function is somewhat different: It merely queues 288 * packets up, and suppresses duplicates. 289 */ 290 spp_reass(cb, si) 291 register struct sppcb *cb; 292 register struct spidp *si; 293 { 294 register struct spidp_q *q; 295 register struct mbuf *m; 296 register struct socket *so = cb->s_nspcb->nsp_socket; 297 char packetp = cb->s_flags & SF_HI; 298 int incr; 299 char wakeup = 0; 300 301 if (si == SI(0)) 302 goto present; 303 /* 304 * Update our news from them. 305 */ 306 if (si->si_cc & SP_SA) 307 cb->s_flags |= (spp_use_delack ? SF_DELACK : SF_ACKNOW); 308 if (SSEQ_GT(si->si_alo, cb->s_ralo)) 309 cb->s_flags |= SF_WIN; 310 if (SSEQ_LEQ(si->si_ack, cb->s_rack)) { 311 if ((si->si_cc & SP_SP) && cb->s_rack != (cb->s_smax + 1)) { 312 sppstat.spps_rcvdupack++; 313 /* 314 * If this is a completely duplicate ack 315 * and other conditions hold, we assume 316 * a packet has been dropped and retransmit 317 * it exactly as in tcp_input(). 318 */ 319 if (si->si_ack != cb->s_rack || 320 si->si_alo != cb->s_ralo) 321 cb->s_dupacks = 0; 322 else if (++cb->s_dupacks == spprexmtthresh) { 323 u_short onxt = cb->s_snxt; 324 int cwnd = cb->s_cwnd; 325 326 cb->s_snxt = si->si_ack; 327 cb->s_cwnd = CUNIT; 328 cb->s_force = 1 + SPPT_REXMT; 329 (void) spp_output(cb, (struct mbuf *)0); 330 cb->s_timer[SPPT_REXMT] = cb->s_rxtcur; 331 cb->s_rtt = 0; 332 if (cwnd >= 4 * CUNIT) 333 cb->s_cwnd = cwnd / 2; 334 if (SSEQ_GT(onxt, cb->s_snxt)) 335 cb->s_snxt = onxt; 336 return (1); 337 } 338 } else 339 cb->s_dupacks = 0; 340 goto update_window; 341 } 342 cb->s_dupacks = 0; 343 /* 344 * If our correspondent acknowledges data we haven't sent 345 * TCP would drop the packet after acking. We'll be a little 346 * more permissive 347 */ 348 if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) { 349 sppstat.spps_rcvacktoomuch++; 350 si->si_ack = cb->s_smax + 1; 351 } 352 sppstat.spps_rcvackpack++; 353 /* 354 * If transmit timer is running and timed sequence 355 * number was acked, update smoothed round trip time. 356 * See discussion of algorithm in tcp_input.c 357 */ 358 if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) { 359 sppstat.spps_rttupdated++; 360 if (cb->s_srtt != 0) { 361 register short delta; 362 delta = cb->s_rtt - (cb->s_srtt >> 3); 363 if ((cb->s_srtt += delta) <= 0) 364 cb->s_srtt = 1; 365 if (delta < 0) 366 delta = -delta; 367 delta -= (cb->s_rttvar >> 2); 368 if ((cb->s_rttvar += delta) <= 0) 369 cb->s_rttvar = 1; 370 } else { 371 /* 372 * No rtt measurement yet 373 */ 374 cb->s_srtt = cb->s_rtt << 3; 375 cb->s_rttvar = cb->s_rtt << 1; 376 } 377 cb->s_rtt = 0; 378 cb->s_rxtshift = 0; 379 SPPT_RANGESET(cb->s_rxtcur, 380 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1, 381 SPPTV_MIN, SPPTV_REXMTMAX); 382 } 383 /* 384 * If all outstanding data is acked, stop retransmit 385 * timer and remember to restart (more output or persist). 386 * If there is more data to be acked, restart retransmit 387 * timer, using current (possibly backed-off) value; 388 */ 389 if (si->si_ack == cb->s_smax + 1) { 390 cb->s_timer[SPPT_REXMT] = 0; 391 cb->s_flags |= SF_RXT; 392 } else if (cb->s_timer[SPPT_PERSIST] == 0) 393 cb->s_timer[SPPT_REXMT] = cb->s_rxtcur; 394 /* 395 * When new data is acked, open the congestion window. 396 * If the window gives us less than ssthresh packets 397 * in flight, open exponentially (maxseg at a time). 398 * Otherwise open linearly (maxseg^2 / cwnd at a time). 399 */ 400 incr = CUNIT; 401 if (cb->s_cwnd > cb->s_ssthresh) 402 incr = max(incr * incr / cb->s_cwnd, 1); 403 cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx); 404 /* 405 * Trim Acked data from output queue. 406 */ 407 while ((m = so->so_snd.sb_mb) != NULL) { 408 if (SSEQ_LT((mtod(m, struct spidp *))->si_seq, si->si_ack)) 409 sbdroprecord(&so->so_snd); 410 else 411 break; 412 } 413 sowwakeup(so); 414 cb->s_rack = si->si_ack; 415 update_window: 416 if (SSEQ_LT(cb->s_snxt, cb->s_rack)) 417 cb->s_snxt = cb->s_rack; 418 if (SSEQ_LT(cb->s_swl1, si->si_seq) || cb->s_swl1 == si->si_seq && 419 (SSEQ_LT(cb->s_swl2, si->si_ack) || 420 cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo))) { 421 /* keep track of pure window updates */ 422 if ((si->si_cc & SP_SP) && cb->s_swl2 == si->si_ack 423 && SSEQ_LT(cb->s_ralo, si->si_alo)) { 424 sppstat.spps_rcvwinupd++; 425 sppstat.spps_rcvdupack--; 426 } 427 cb->s_ralo = si->si_alo; 428 cb->s_swl1 = si->si_seq; 429 cb->s_swl2 = si->si_ack; 430 cb->s_swnd = (1 + si->si_alo - si->si_ack); 431 if (cb->s_swnd > cb->s_smxw) 432 cb->s_smxw = cb->s_swnd; 433 cb->s_flags |= SF_WIN; 434 } 435 /* 436 * If this packet number is higher than that which 437 * we have allocated refuse it, unless urgent 438 */ 439 if (SSEQ_GT(si->si_seq, cb->s_alo)) { 440 if (si->si_cc & SP_SP) { 441 sppstat.spps_rcvwinprobe++; 442 return (1); 443 } else 444 sppstat.spps_rcvpackafterwin++; 445 if (si->si_cc & SP_OB) { 446 if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) { 447 ns_error(dtom(si), NS_ERR_FULLUP, 0); 448 return (0); 449 } /* else queue this packet; */ 450 } else { 451 /*register struct socket *so = cb->s_nspcb->nsp_socket; 452 if (so->so_state && SS_NOFDREF) { 453 ns_error(dtom(si), NS_ERR_NOSOCK, 0); 454 (void)spp_close(cb); 455 } else 456 would crash system*/ 457 spp_istat.notyet++; 458 ns_error(dtom(si), NS_ERR_FULLUP, 0); 459 return (0); 460 } 461 } 462 /* 463 * If this is a system packet, we don't need to 464 * queue it up, and won't update acknowledge # 465 */ 466 if (si->si_cc & SP_SP) { 467 return (1); 468 } 469 /* 470 * We have already seen this packet, so drop. 471 */ 472 if (SSEQ_LT(si->si_seq, cb->s_ack)) { 473 spp_istat.bdreas++; 474 sppstat.spps_rcvduppack++; 475 if (si->si_seq == cb->s_ack - 1) 476 spp_istat.lstdup++; 477 return (1); 478 } 479 /* 480 * Loop through all packets queued up to insert in 481 * appropriate sequence. 482 */ 483 for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { 484 if (si->si_seq == SI(q)->si_seq) { 485 sppstat.spps_rcvduppack++; 486 return (1); 487 } 488 if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) { 489 sppstat.spps_rcvoopack++; 490 break; 491 } 492 } 493 insque(si, q->si_prev); 494 /* 495 * If this packet is urgent, inform process 496 */ 497 if (si->si_cc & SP_OB) { 498 cb->s_iobc = ((char *)si)[1 + sizeof(*si)]; 499 sohasoutofband(so); 500 cb->s_oobflags |= SF_IOOB; 501 } 502 present: 503 #define SPINC sizeof(struct sphdr) 504 /* 505 * Loop through all packets queued up to update acknowledge 506 * number, and present all acknowledged data to user; 507 * If in packet interface mode, show packet headers. 508 */ 509 for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { 510 if (SI(q)->si_seq == cb->s_ack) { 511 cb->s_ack++; 512 m = dtom(q); 513 if (SI(q)->si_cc & SP_OB) { 514 cb->s_oobflags &= ~SF_IOOB; 515 if (so->so_rcv.sb_cc) 516 so->so_oobmark = so->so_rcv.sb_cc; 517 else 518 so->so_state |= SS_RCVATMARK; 519 } 520 q = q->si_prev; 521 remque(q->si_next); 522 wakeup = 1; 523 sppstat.spps_rcvpack++; 524 #ifdef SF_NEWCALL 525 if (cb->s_flags2 & SF_NEWCALL) { 526 struct sphdr *sp = mtod(m, struct sphdr *); 527 u_char dt = sp->sp_dt; 528 spp_newchecks[4]++; 529 if (dt != cb->s_rhdr.sp_dt) { 530 struct mbuf *mm = 531 m_getclr(M_DONTWAIT, MT_CONTROL); 532 spp_newchecks[0]++; 533 if (mm != NULL) { 534 u_short *s = 535 mtod(mm, u_short *); 536 cb->s_rhdr.sp_dt = dt; 537 mm->m_len = 5; /*XXX*/ 538 s[0] = 5; 539 s[1] = 1; 540 *(u_char *)(&s[2]) = dt; 541 sbappend(&so->so_rcv, mm); 542 } 543 } 544 if (sp->sp_cc & SP_OB) { 545 MCHTYPE(m, MT_OOBDATA); 546 spp_newchecks[1]++; 547 so->so_oobmark = 0; 548 so->so_state &= ~SS_RCVATMARK; 549 } 550 if (packetp == 0) { 551 m->m_data += SPINC; 552 m->m_len -= SPINC; 553 m->m_pkthdr.len -= SPINC; 554 } 555 if ((sp->sp_cc & SP_EM) || packetp) { 556 sbappendrecord(&so->so_rcv, m); 557 spp_newchecks[9]++; 558 } else 559 sbappend(&so->so_rcv, m); 560 } else 561 #endif 562 if (packetp) { 563 sbappendrecord(&so->so_rcv, m); 564 } else { 565 cb->s_rhdr = *mtod(m, struct sphdr *); 566 m->m_data += SPINC; 567 m->m_len -= SPINC; 568 m->m_pkthdr.len -= SPINC; 569 sbappend(&so->so_rcv, m); 570 } 571 } else 572 break; 573 } 574 if (wakeup) sorwakeup(so); 575 return (0); 576 } 577 578 spp_ctlinput(cmd, arg) 579 int cmd; 580 caddr_t arg; 581 { 582 struct ns_addr *na; 583 extern u_char nsctlerrmap[]; 584 extern spp_abort(), spp_quench(); 585 extern struct nspcb *idp_drop(); 586 struct ns_errp *errp; 587 struct nspcb *nsp; 588 struct sockaddr_ns *sns; 589 int type; 590 591 if (cmd < 0 || cmd > PRC_NCMDS) 592 return; 593 type = NS_ERR_UNREACH_HOST; 594 595 switch (cmd) { 596 597 case PRC_ROUTEDEAD: 598 return; 599 600 case PRC_IFDOWN: 601 case PRC_HOSTDEAD: 602 case PRC_HOSTUNREACH: 603 sns = (struct sockaddr_ns *)arg; 604 if (sns->sns_family != AF_NS) 605 return; 606 na = &sns->sns_addr; 607 break; 608 609 default: 610 errp = (struct ns_errp *)arg; 611 na = &errp->ns_err_idp.idp_dna; 612 type = errp->ns_err_num; 613 type = ntohs((u_short)type); 614 } 615 switch (type) { 616 617 case NS_ERR_UNREACH_HOST: 618 ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0); 619 break; 620 621 case NS_ERR_TOO_BIG: 622 case NS_ERR_NOSOCK: 623 nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port, 624 NS_WILDCARD); 625 if (nsp) { 626 if(nsp->nsp_pcb) 627 (void) spp_drop((struct sppcb *)nsp->nsp_pcb, 628 (int)nsctlerrmap[cmd]); 629 else 630 (void) idp_drop(nsp, (int)nsctlerrmap[cmd]); 631 } 632 break; 633 634 case NS_ERR_FULLUP: 635 ns_pcbnotify(na, 0, spp_quench, (long) 0); 636 } 637 } 638 /* 639 * When a source quench is received, close congestion window 640 * to one packet. We will gradually open it again as we proceed. 641 */ 642 spp_quench(nsp) 643 struct nspcb *nsp; 644 { 645 struct sppcb *cb = nstosppcb(nsp); 646 647 if (cb) 648 cb->s_cwnd = CUNIT; 649 } 650 651 #ifdef notdef 652 int 653 spp_fixmtu(nsp) 654 register struct nspcb *nsp; 655 { 656 register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb); 657 register struct mbuf *m; 658 register struct spidp *si; 659 struct ns_errp *ep; 660 struct sockbuf *sb; 661 int badseq, len; 662 struct mbuf *firstbad, *m0; 663 664 if (cb) { 665 /* 666 * The notification that we have sent 667 * too much is bad news -- we will 668 * have to go through queued up so far 669 * splitting ones which are too big and 670 * reassigning sequence numbers and checksums. 671 * we should then retransmit all packets from 672 * one above the offending packet to the last one 673 * we had sent (or our allocation) 674 * then the offending one so that the any queued 675 * data at our destination will be discarded. 676 */ 677 ep = (struct ns_errp *)nsp->nsp_notify_param; 678 sb = &nsp->nsp_socket->so_snd; 679 cb->s_mtu = ep->ns_err_param; 680 badseq = SI(&ep->ns_err_idp)->si_seq; 681 for (m = sb->sb_mb; m; m = m->m_act) { 682 si = mtod(m, struct spidp *); 683 if (si->si_seq == badseq) 684 break; 685 } 686 if (m == 0) return; 687 firstbad = m; 688 /*for (;;) {*/ 689 /* calculate length */ 690 for (m0 = m, len = 0; m ; m = m->m_next) 691 len += m->m_len; 692 if (len > cb->s_mtu) { 693 } 694 /* FINISH THIS 695 } */ 696 } 697 } 698 #endif 699 700 spp_output(cb, m0) 701 register struct sppcb *cb; 702 struct mbuf *m0; 703 { 704 struct socket *so = cb->s_nspcb->nsp_socket; 705 register struct mbuf *m; 706 register struct spidp *si = (struct spidp *) 0; 707 register struct sockbuf *sb = &so->so_snd; 708 int len = 0, win, rcv_win; 709 short span, off, recordp = 0; 710 u_short alo; 711 int error = 0, sendalot; 712 #ifdef notdef 713 int idle; 714 #endif 715 struct mbuf *mprev; 716 extern int idpcksum; 717 718 if (m0) { 719 int mtu = cb->s_mtu; 720 int datalen; 721 /* 722 * Make sure that packet isn't too big. 723 */ 724 for (m = m0; m ; m = m->m_next) { 725 mprev = m; 726 len += m->m_len; 727 if (m->m_flags & M_EOR) 728 recordp = 1; 729 } 730 datalen = (cb->s_flags & SF_HO) ? 731 len - sizeof (struct sphdr) : len; 732 if (datalen > mtu) { 733 if (cb->s_flags & SF_PI) { 734 m_freem(m0); 735 return (EMSGSIZE); 736 } else { 737 int oldEM = cb->s_cc & SP_EM; 738 739 cb->s_cc &= ~SP_EM; 740 while (len > mtu) { 741 /* 742 * Here we are only being called 743 * from usrreq(), so it is OK to 744 * block. 745 */ 746 m = m_copym(m0, 0, mtu, M_WAIT); 747 if (cb->s_flags & SF_NEWCALL) { 748 struct mbuf *mm = m; 749 spp_newchecks[7]++; 750 while (mm) { 751 mm->m_flags &= ~M_EOR; 752 mm = mm->m_next; 753 } 754 } 755 error = spp_output(cb, m); 756 if (error) { 757 cb->s_cc |= oldEM; 758 m_freem(m0); 759 return(error); 760 } 761 m_adj(m0, mtu); 762 len -= mtu; 763 } 764 cb->s_cc |= oldEM; 765 } 766 } 767 /* 768 * Force length even, by adding a "garbage byte" if 769 * necessary. 770 */ 771 if (len & 1) { 772 m = mprev; 773 if (M_TRAILINGSPACE(m) >= 1) 774 m->m_len++; 775 else { 776 struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA); 777 778 if (m1 == 0) { 779 m_freem(m0); 780 return (ENOBUFS); 781 } 782 m1->m_len = 1; 783 *(mtod(m1, u_char *)) = 0; 784 m->m_next = m1; 785 } 786 } 787 m = m_gethdr(M_DONTWAIT, MT_HEADER); 788 if (m == 0) { 789 m_freem(m0); 790 return (ENOBUFS); 791 } 792 /* 793 * Fill in mbuf with extended SP header 794 * and addresses and length put into network format. 795 */ 796 MH_ALIGN(m, sizeof (struct spidp)); 797 m->m_len = sizeof (struct spidp); 798 m->m_next = m0; 799 si = mtod(m, struct spidp *); 800 si->si_i = *cb->s_idp; 801 si->si_s = cb->s_shdr; 802 if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) { 803 register struct sphdr *sh; 804 if (m0->m_len < sizeof (*sh)) { 805 if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) { 806 (void) m_free(m); 807 m_freem(m0); 808 return (EINVAL); 809 } 810 m->m_next = m0; 811 } 812 sh = mtod(m0, struct sphdr *); 813 si->si_dt = sh->sp_dt; 814 si->si_cc |= sh->sp_cc & SP_EM; 815 m0->m_len -= sizeof (*sh); 816 m0->m_data += sizeof (*sh); 817 len -= sizeof (*sh); 818 } 819 len += sizeof(*si); 820 if ((cb->s_flags2 & SF_NEWCALL) && recordp) { 821 si->si_cc |= SP_EM; 822 spp_newchecks[8]++; 823 } 824 if (cb->s_oobflags & SF_SOOB) { 825 /* 826 * Per jqj@cornell: 827 * make sure OB packets convey exactly 1 byte. 828 * If the packet is 1 byte or larger, we 829 * have already guaranted there to be at least 830 * one garbage byte for the checksum, and 831 * extra bytes shouldn't hurt! 832 */ 833 if (len > sizeof(*si)) { 834 si->si_cc |= SP_OB; 835 len = (1 + sizeof(*si)); 836 } 837 } 838 si->si_len = htons((u_short)len); 839 m->m_pkthdr.len = ((len - 1) | 1) + 1; 840 /* 841 * queue stuff up for output 842 */ 843 sbappendrecord(sb, m); 844 cb->s_seq++; 845 } 846 #ifdef notdef 847 idle = (cb->s_smax == (cb->s_rack - 1)); 848 #endif 849 again: 850 sendalot = 0; 851 off = cb->s_snxt - cb->s_rack; 852 win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)); 853 854 /* 855 * If in persist timeout with window of 0, send a probe. 856 * Otherwise, if window is small but nonzero 857 * and timer expired, send what we can and go into 858 * transmit state. 859 */ 860 if (cb->s_force == 1 + SPPT_PERSIST) { 861 if (win != 0) { 862 cb->s_timer[SPPT_PERSIST] = 0; 863 cb->s_rxtshift = 0; 864 } 865 } 866 span = cb->s_seq - cb->s_rack; 867 len = min(span, win) - off; 868 869 if (len < 0) { 870 /* 871 * Window shrank after we went into it. 872 * If window shrank to 0, cancel pending 873 * restransmission and pull s_snxt back 874 * to (closed) window. We will enter persist 875 * state below. If the widndow didn't close completely, 876 * just wait for an ACK. 877 */ 878 len = 0; 879 if (win == 0) { 880 cb->s_timer[SPPT_REXMT] = 0; 881 cb->s_snxt = cb->s_rack; 882 } 883 } 884 if (len > 1) 885 sendalot = 1; 886 rcv_win = sbspace(&so->so_rcv); 887 888 /* 889 * Send if we owe peer an ACK. 890 */ 891 if (cb->s_oobflags & SF_SOOB) { 892 /* 893 * must transmit this out of band packet 894 */ 895 cb->s_oobflags &= ~ SF_SOOB; 896 sendalot = 1; 897 sppstat.spps_sndurg++; 898 goto found; 899 } 900 if (cb->s_flags & SF_ACKNOW) 901 goto send; 902 if (cb->s_state < TCPS_ESTABLISHED) 903 goto send; 904 /* 905 * Silly window can't happen in spp. 906 * Code from tcp deleted. 907 */ 908 if (len) 909 goto send; 910 /* 911 * Compare available window to amount of window 912 * known to peer (as advertised window less 913 * next expected input.) If the difference is at least two 914 * packets or at least 35% of the mximum possible window, 915 * then want to send a window update to peer. 916 */ 917 if (rcv_win > 0) { 918 u_short delta = 1 + cb->s_alo - cb->s_ack; 919 int adv = rcv_win - (delta * cb->s_mtu); 920 921 if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) || 922 (100 * adv / so->so_rcv.sb_hiwat >= 35)) { 923 sppstat.spps_sndwinup++; 924 cb->s_flags |= SF_ACKNOW; 925 goto send; 926 } 927 928 } 929 /* 930 * Many comments from tcp_output.c are appropriate here 931 * including . . . 932 * If send window is too small, there is data to transmit, and no 933 * retransmit or persist is pending, then go to persist state. 934 * If nothing happens soon, send when timer expires: 935 * if window is nonzero, transmit what we can, 936 * otherwise send a probe. 937 */ 938 if (so->so_snd.sb_cc && cb->s_timer[SPPT_REXMT] == 0 && 939 cb->s_timer[SPPT_PERSIST] == 0) { 940 cb->s_rxtshift = 0; 941 spp_setpersist(cb); 942 } 943 /* 944 * No reason to send a packet, just return. 945 */ 946 cb->s_outx = 1; 947 return (0); 948 949 send: 950 /* 951 * Find requested packet. 952 */ 953 si = 0; 954 if (len > 0) { 955 cb->s_want = cb->s_snxt; 956 for (m = sb->sb_mb; m; m = m->m_act) { 957 si = mtod(m, struct spidp *); 958 if (SSEQ_LEQ(cb->s_snxt, si->si_seq)) 959 break; 960 } 961 found: 962 if (si) { 963 if (si->si_seq == cb->s_snxt) 964 cb->s_snxt++; 965 else 966 sppstat.spps_sndvoid++, si = 0; 967 } 968 } 969 /* 970 * update window 971 */ 972 if (rcv_win < 0) 973 rcv_win = 0; 974 alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu)); 975 if (SSEQ_LT(alo, cb->s_alo)) 976 alo = cb->s_alo; 977 978 if (si) { 979 /* 980 * must make a copy of this packet for 981 * idp_output to monkey with 982 */ 983 m = m_copy(dtom(si), 0, (int)M_COPYALL); 984 if (m == NULL) { 985 return (ENOBUFS); 986 } 987 si = mtod(m, struct spidp *); 988 if (SSEQ_LT(si->si_seq, cb->s_smax)) 989 sppstat.spps_sndrexmitpack++; 990 else 991 sppstat.spps_sndpack++; 992 } else if (cb->s_force || cb->s_flags & SF_ACKNOW) { 993 /* 994 * Must send an acknowledgement or a probe 995 */ 996 if (cb->s_force) 997 sppstat.spps_sndprobe++; 998 if (cb->s_flags & SF_ACKNOW) 999 sppstat.spps_sndacks++; 1000 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1001 if (m == 0) 1002 return (ENOBUFS); 1003 /* 1004 * Fill in mbuf with extended SP header 1005 * and addresses and length put into network format. 1006 */ 1007 MH_ALIGN(m, sizeof (struct spidp)); 1008 m->m_len = sizeof (*si); 1009 m->m_pkthdr.len = sizeof (*si); 1010 si = mtod(m, struct spidp *); 1011 si->si_i = *cb->s_idp; 1012 si->si_s = cb->s_shdr; 1013 si->si_seq = cb->s_smax + 1; 1014 si->si_len = htons(sizeof (*si)); 1015 si->si_cc |= SP_SP; 1016 } else { 1017 cb->s_outx = 3; 1018 if (so->so_options & SO_DEBUG || traceallspps) 1019 spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); 1020 return (0); 1021 } 1022 /* 1023 * Stuff checksum and output datagram. 1024 */ 1025 if ((si->si_cc & SP_SP) == 0) { 1026 if (cb->s_force != (1 + SPPT_PERSIST) || 1027 cb->s_timer[SPPT_PERSIST] == 0) { 1028 /* 1029 * If this is a new packet and we are not currently 1030 * timing anything, time this one. 1031 */ 1032 if (SSEQ_LT(cb->s_smax, si->si_seq)) { 1033 cb->s_smax = si->si_seq; 1034 if (cb->s_rtt == 0) { 1035 sppstat.spps_segstimed++; 1036 cb->s_rtseq = si->si_seq; 1037 cb->s_rtt = 1; 1038 } 1039 } 1040 /* 1041 * Set rexmt timer if not currently set, 1042 * Initial value for retransmit timer is smoothed 1043 * round-trip time + 2 * round-trip time variance. 1044 * Initialize shift counter which is used for backoff 1045 * of retransmit time. 1046 */ 1047 if (cb->s_timer[SPPT_REXMT] == 0 && 1048 cb->s_snxt != cb->s_rack) { 1049 cb->s_timer[SPPT_REXMT] = cb->s_rxtcur; 1050 if (cb->s_timer[SPPT_PERSIST]) { 1051 cb->s_timer[SPPT_PERSIST] = 0; 1052 cb->s_rxtshift = 0; 1053 } 1054 } 1055 } else if (SSEQ_LT(cb->s_smax, si->si_seq)) { 1056 cb->s_smax = si->si_seq; 1057 } 1058 } else if (cb->s_state < TCPS_ESTABLISHED) { 1059 if (cb->s_rtt == 0) 1060 cb->s_rtt = 1; /* Time initial handshake */ 1061 if (cb->s_timer[SPPT_REXMT] == 0) 1062 cb->s_timer[SPPT_REXMT] = cb->s_rxtcur; 1063 } 1064 { 1065 /* 1066 * Do not request acks when we ack their data packets or 1067 * when we do a gratuitous window update. 1068 */ 1069 if (((si->si_cc & SP_SP) == 0) || cb->s_force) 1070 si->si_cc |= SP_SA; 1071 si->si_seq = htons(si->si_seq); 1072 si->si_alo = htons(alo); 1073 si->si_ack = htons(cb->s_ack); 1074 1075 if (idpcksum) { 1076 si->si_sum = 0; 1077 len = ntohs(si->si_len); 1078 if (len & 1) 1079 len++; 1080 si->si_sum = ns_cksum(m, len); 1081 } else 1082 si->si_sum = 0xffff; 1083 1084 cb->s_outx = 4; 1085 if (so->so_options & SO_DEBUG || traceallspps) 1086 spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); 1087 1088 if (so->so_options & SO_DONTROUTE) 1089 error = ns_output(m, (struct route *)0, NS_ROUTETOIF); 1090 else 1091 error = ns_output(m, &cb->s_nspcb->nsp_route, 0); 1092 } 1093 if (error) { 1094 return (error); 1095 } 1096 sppstat.spps_sndtotal++; 1097 /* 1098 * Data sent (as far as we can tell). 1099 * If this advertises a larger window than any other segment, 1100 * then remember the size of the advertized window. 1101 * Any pending ACK has now been sent. 1102 */ 1103 cb->s_force = 0; 1104 cb->s_flags &= ~(SF_ACKNOW|SF_DELACK); 1105 if (SSEQ_GT(alo, cb->s_alo)) 1106 cb->s_alo = alo; 1107 if (sendalot) 1108 goto again; 1109 cb->s_outx = 5; 1110 return (0); 1111 } 1112 1113 int spp_do_persist_panics = 0; 1114 1115 spp_setpersist(cb) 1116 register struct sppcb *cb; 1117 { 1118 register t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1; 1119 extern int spp_backoff[]; 1120 1121 if (cb->s_timer[SPPT_REXMT] && spp_do_persist_panics) 1122 panic("spp_output REXMT"); 1123 /* 1124 * Start/restart persistance timer. 1125 */ 1126 SPPT_RANGESET(cb->s_timer[SPPT_PERSIST], 1127 t*spp_backoff[cb->s_rxtshift], 1128 SPPTV_PERSMIN, SPPTV_PERSMAX); 1129 if (cb->s_rxtshift < SPP_MAXRXTSHIFT) 1130 cb->s_rxtshift++; 1131 } 1132 /*ARGSUSED*/ 1133 spp_ctloutput(req, so, level, name, value) 1134 int req; 1135 struct socket *so; 1136 int name; 1137 struct mbuf **value; 1138 { 1139 register struct mbuf *m; 1140 struct nspcb *nsp = sotonspcb(so); 1141 register struct sppcb *cb; 1142 int mask, error = 0; 1143 1144 if (level != NSPROTO_SPP) { 1145 /* This will have to be changed when we do more general 1146 stacking of protocols */ 1147 return (idp_ctloutput(req, so, level, name, value)); 1148 } 1149 if (nsp == NULL) { 1150 error = EINVAL; 1151 goto release; 1152 } else 1153 cb = nstosppcb(nsp); 1154 1155 switch (req) { 1156 1157 case PRCO_GETOPT: 1158 if (value == NULL) 1159 return (EINVAL); 1160 m = m_get(M_DONTWAIT, MT_DATA); 1161 if (m == NULL) 1162 return (ENOBUFS); 1163 switch (name) { 1164 1165 case SO_HEADERS_ON_INPUT: 1166 mask = SF_HI; 1167 goto get_flags; 1168 1169 case SO_HEADERS_ON_OUTPUT: 1170 mask = SF_HO; 1171 get_flags: 1172 m->m_len = sizeof(short); 1173 *mtod(m, short *) = cb->s_flags & mask; 1174 break; 1175 1176 case SO_MTU: 1177 m->m_len = sizeof(u_short); 1178 *mtod(m, short *) = cb->s_mtu; 1179 break; 1180 1181 case SO_LAST_HEADER: 1182 m->m_len = sizeof(struct sphdr); 1183 *mtod(m, struct sphdr *) = cb->s_rhdr; 1184 break; 1185 1186 case SO_DEFAULT_HEADERS: 1187 m->m_len = sizeof(struct spidp); 1188 *mtod(m, struct sphdr *) = cb->s_shdr; 1189 break; 1190 1191 default: 1192 error = EINVAL; 1193 } 1194 *value = m; 1195 break; 1196 1197 case PRCO_SETOPT: 1198 if (value == 0 || *value == 0) { 1199 error = EINVAL; 1200 break; 1201 } 1202 switch (name) { 1203 int *ok; 1204 1205 case SO_HEADERS_ON_INPUT: 1206 mask = SF_HI; 1207 goto set_head; 1208 1209 case SO_HEADERS_ON_OUTPUT: 1210 mask = SF_HO; 1211 set_head: 1212 if (cb->s_flags & SF_PI) { 1213 ok = mtod(*value, int *); 1214 if (*ok) 1215 cb->s_flags |= mask; 1216 else 1217 cb->s_flags &= ~mask; 1218 } else error = EINVAL; 1219 break; 1220 1221 case SO_MTU: 1222 cb->s_mtu = *(mtod(*value, u_short *)); 1223 break; 1224 1225 #ifdef SF_NEWCALL 1226 case SO_NEWCALL: 1227 ok = mtod(*value, int *); 1228 if (*ok) { 1229 cb->s_flags2 |= SF_NEWCALL; 1230 spp_newchecks[5]++; 1231 } else { 1232 cb->s_flags2 &= ~SF_NEWCALL; 1233 spp_newchecks[6]++; 1234 } 1235 break; 1236 #endif 1237 1238 case SO_DEFAULT_HEADERS: 1239 { 1240 register struct sphdr *sp 1241 = mtod(*value, struct sphdr *); 1242 cb->s_dt = sp->sp_dt; 1243 cb->s_cc = sp->sp_cc & SP_EM; 1244 } 1245 break; 1246 1247 default: 1248 error = EINVAL; 1249 } 1250 m_freem(*value); 1251 break; 1252 } 1253 release: 1254 return (error); 1255 } 1256 1257 /*ARGSUSED*/ 1258 spp_usrreq(so, req, m, nam, controlp) 1259 struct socket *so; 1260 int req; 1261 struct mbuf *m, *nam, *controlp; 1262 { 1263 struct nspcb *nsp = sotonspcb(so); 1264 register struct sppcb *cb; 1265 int s = splnet(); 1266 int error = 0, ostate; 1267 struct mbuf *mm; 1268 register struct sockbuf *sb; 1269 1270 if (req == PRU_CONTROL) 1271 return (ns_control(so, (int)m, (caddr_t)nam, 1272 (struct ifnet *)controlp)); 1273 if (nsp == NULL) { 1274 if (req != PRU_ATTACH) { 1275 error = EINVAL; 1276 goto release; 1277 } 1278 } else 1279 cb = nstosppcb(nsp); 1280 1281 ostate = cb ? cb->s_state : 0; 1282 1283 switch (req) { 1284 1285 case PRU_ATTACH: 1286 if (nsp != NULL) { 1287 error = EISCONN; 1288 break; 1289 } 1290 error = ns_pcballoc(so, &nspcb); 1291 if (error) 1292 break; 1293 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1294 error = soreserve(so, (u_long) 3072, (u_long) 3072); 1295 if (error) 1296 break; 1297 } 1298 nsp = sotonspcb(so); 1299 1300 mm = m_getclr(M_DONTWAIT, MT_PCB); 1301 sb = &so->so_snd; 1302 1303 if (mm == NULL) { 1304 error = ENOBUFS; 1305 break; 1306 } 1307 cb = mtod(mm, struct sppcb *); 1308 mm = m_getclr(M_DONTWAIT, MT_HEADER); 1309 if (mm == NULL) { 1310 (void) m_free(dtom(m)); 1311 error = ENOBUFS; 1312 break; 1313 } 1314 cb->s_idp = mtod(mm, struct idp *); 1315 cb->s_state = TCPS_LISTEN; 1316 cb->s_smax = -1; 1317 cb->s_swl1 = -1; 1318 cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q; 1319 cb->s_nspcb = nsp; 1320 cb->s_mtu = 576 - sizeof (struct spidp); 1321 cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu; 1322 cb->s_ssthresh = cb->s_cwnd; 1323 cb->s_cwmx = sbspace(sb) * CUNIT / 1324 (2 * sizeof (struct spidp)); 1325 /* Above is recomputed when connecting to account 1326 for changed buffering or mtu's */ 1327 cb->s_rtt = SPPTV_SRTTBASE; 1328 cb->s_rttvar = SPPTV_SRTTDFLT << 2; 1329 SPPT_RANGESET(cb->s_rxtcur, 1330 ((SPPTV_SRTTBASE >> 2) + (SPPTV_SRTTDFLT << 2)) >> 1, 1331 SPPTV_MIN, SPPTV_REXMTMAX); 1332 nsp->nsp_pcb = (caddr_t) cb; 1333 break; 1334 1335 case PRU_DETACH: 1336 if (nsp == NULL) { 1337 error = ENOTCONN; 1338 break; 1339 } 1340 if (cb->s_state > TCPS_LISTEN) 1341 cb = spp_disconnect(cb); 1342 else 1343 cb = spp_close(cb); 1344 break; 1345 1346 case PRU_BIND: 1347 error = ns_pcbbind(nsp, nam); 1348 break; 1349 1350 case PRU_LISTEN: 1351 if (nsp->nsp_lport == 0) 1352 error = ns_pcbbind(nsp, (struct mbuf *)0); 1353 if (error == 0) 1354 cb->s_state = TCPS_LISTEN; 1355 break; 1356 1357 /* 1358 * Initiate connection to peer. 1359 * Enter SYN_SENT state, and mark socket as connecting. 1360 * Start keep-alive timer, setup prototype header, 1361 * Send initial system packet requesting connection. 1362 */ 1363 case PRU_CONNECT: 1364 if (nsp->nsp_lport == 0) { 1365 error = ns_pcbbind(nsp, (struct mbuf *)0); 1366 if (error) 1367 break; 1368 } 1369 error = ns_pcbconnect(nsp, nam); 1370 if (error) 1371 break; 1372 soisconnecting(so); 1373 sppstat.spps_connattempt++; 1374 cb->s_state = TCPS_SYN_SENT; 1375 cb->s_did = 0; 1376 spp_template(cb); 1377 cb->s_timer[SPPT_KEEP] = SPPTV_KEEP; 1378 cb->s_force = 1 + SPPTV_KEEP; 1379 /* 1380 * Other party is required to respond to 1381 * the port I send from, but he is not 1382 * required to answer from where I am sending to, 1383 * so allow wildcarding. 1384 * original port I am sending to is still saved in 1385 * cb->s_dport. 1386 */ 1387 nsp->nsp_fport = 0; 1388 error = spp_output(cb, (struct mbuf *) 0); 1389 break; 1390 1391 case PRU_CONNECT2: 1392 error = EOPNOTSUPP; 1393 break; 1394 1395 /* 1396 * We may decide later to implement connection closing 1397 * handshaking at the spp level optionally. 1398 * here is the hook to do it: 1399 */ 1400 case PRU_DISCONNECT: 1401 cb = spp_disconnect(cb); 1402 break; 1403 1404 /* 1405 * Accept a connection. Essentially all the work is 1406 * done at higher levels; just return the address 1407 * of the peer, storing through addr. 1408 */ 1409 case PRU_ACCEPT: { 1410 struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); 1411 1412 nam->m_len = sizeof (struct sockaddr_ns); 1413 sns->sns_family = AF_NS; 1414 sns->sns_addr = nsp->nsp_faddr; 1415 break; 1416 } 1417 1418 case PRU_SHUTDOWN: 1419 socantsendmore(so); 1420 cb = spp_usrclosed(cb); 1421 if (cb) 1422 error = spp_output(cb, (struct mbuf *) 0); 1423 break; 1424 1425 /* 1426 * After a receive, possibly send acknowledgment 1427 * updating allocation. 1428 */ 1429 case PRU_RCVD: 1430 cb->s_flags |= SF_RVD; 1431 (void) spp_output(cb, (struct mbuf *) 0); 1432 cb->s_flags &= ~SF_RVD; 1433 break; 1434 1435 case PRU_ABORT: 1436 (void) spp_drop(cb, ECONNABORTED); 1437 break; 1438 1439 case PRU_SENSE: 1440 case PRU_CONTROL: 1441 m = NULL; 1442 error = EOPNOTSUPP; 1443 break; 1444 1445 case PRU_RCVOOB: 1446 if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark || 1447 (so->so_state & SS_RCVATMARK)) { 1448 m->m_len = 1; 1449 *mtod(m, caddr_t) = cb->s_iobc; 1450 break; 1451 } 1452 error = EINVAL; 1453 break; 1454 1455 case PRU_SENDOOB: 1456 if (sbspace(&so->so_snd) < -512) { 1457 error = ENOBUFS; 1458 break; 1459 } 1460 cb->s_oobflags |= SF_SOOB; 1461 /* fall into */ 1462 case PRU_SEND: 1463 if (controlp) { 1464 u_short *p = mtod(controlp, u_short *); 1465 spp_newchecks[2]++; 1466 if ((p[0] == 5) && p[1] == 1) { /* XXXX, for testing */ 1467 cb->s_shdr.sp_dt = *(u_char *)(&p[2]); 1468 spp_newchecks[3]++; 1469 } 1470 m_freem(controlp); 1471 } 1472 controlp = NULL; 1473 error = spp_output(cb, m); 1474 m = NULL; 1475 break; 1476 1477 case PRU_SOCKADDR: 1478 ns_setsockaddr(nsp, nam); 1479 break; 1480 1481 case PRU_PEERADDR: 1482 ns_setpeeraddr(nsp, nam); 1483 break; 1484 1485 case PRU_SLOWTIMO: 1486 cb = spp_timers(cb, (int)nam); 1487 req |= ((int)nam) << 8; 1488 break; 1489 1490 case PRU_FASTTIMO: 1491 case PRU_PROTORCV: 1492 case PRU_PROTOSEND: 1493 error = EOPNOTSUPP; 1494 break; 1495 1496 default: 1497 panic("sp_usrreq"); 1498 } 1499 if (cb && (so->so_options & SO_DEBUG || traceallspps)) 1500 spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req); 1501 release: 1502 if (controlp != NULL) 1503 m_freem(controlp); 1504 if (m != NULL) 1505 m_freem(m); 1506 splx(s); 1507 return (error); 1508 } 1509 1510 spp_usrreq_sp(so, req, m, nam, controlp) 1511 struct socket *so; 1512 int req; 1513 struct mbuf *m, *nam, *controlp; 1514 { 1515 int error = spp_usrreq(so, req, m, nam, controlp); 1516 1517 if (req == PRU_ATTACH && error == 0) { 1518 struct nspcb *nsp = sotonspcb(so); 1519 ((struct sppcb *)nsp->nsp_pcb)->s_flags |= 1520 (SF_HI | SF_HO | SF_PI); 1521 } 1522 return (error); 1523 } 1524 1525 /* 1526 * Create template to be used to send spp packets on a connection. 1527 * Called after host entry created, fills 1528 * in a skeletal spp header (choosing connection id), 1529 * minimizing the amount of work necessary when the connection is used. 1530 */ 1531 spp_template(cb) 1532 register struct sppcb *cb; 1533 { 1534 register struct nspcb *nsp = cb->s_nspcb; 1535 register struct idp *idp = cb->s_idp; 1536 register struct sockbuf *sb = &(nsp->nsp_socket->so_snd); 1537 1538 idp->idp_pt = NSPROTO_SPP; 1539 idp->idp_sna = nsp->nsp_laddr; 1540 idp->idp_dna = nsp->nsp_faddr; 1541 cb->s_sid = htons(spp_iss); 1542 spp_iss += SPP_ISSINCR/2; 1543 cb->s_alo = 1; 1544 cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu; 1545 cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement 1546 of large packets */ 1547 cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spidp)); 1548 cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd); 1549 /* But allow for lots of little packets as well */ 1550 } 1551 1552 /* 1553 * Close a SPIP control block: 1554 * discard spp control block itself 1555 * discard ns protocol control block 1556 * wake up any sleepers 1557 */ 1558 struct sppcb * 1559 spp_close(cb) 1560 register struct sppcb *cb; 1561 { 1562 register struct spidp_q *s; 1563 struct nspcb *nsp = cb->s_nspcb; 1564 struct socket *so = nsp->nsp_socket; 1565 register struct mbuf *m; 1566 1567 s = cb->s_q.si_next; 1568 while (s != &(cb->s_q)) { 1569 s = s->si_next; 1570 m = dtom(s->si_prev); 1571 remque(s->si_prev); 1572 m_freem(m); 1573 } 1574 (void) m_free(dtom(cb->s_idp)); 1575 (void) m_free(dtom(cb)); 1576 nsp->nsp_pcb = 0; 1577 soisdisconnected(so); 1578 ns_pcbdetach(nsp); 1579 sppstat.spps_closed++; 1580 return ((struct sppcb *)0); 1581 } 1582 /* 1583 * Someday we may do level 3 handshaking 1584 * to close a connection or send a xerox style error. 1585 * For now, just close. 1586 */ 1587 struct sppcb * 1588 spp_usrclosed(cb) 1589 register struct sppcb *cb; 1590 { 1591 return (spp_close(cb)); 1592 } 1593 struct sppcb * 1594 spp_disconnect(cb) 1595 register struct sppcb *cb; 1596 { 1597 return (spp_close(cb)); 1598 } 1599 /* 1600 * Drop connection, reporting 1601 * the specified error. 1602 */ 1603 struct sppcb * 1604 spp_drop(cb, errno) 1605 register struct sppcb *cb; 1606 int errno; 1607 { 1608 struct socket *so = cb->s_nspcb->nsp_socket; 1609 1610 /* 1611 * someday, in the xerox world 1612 * we will generate error protocol packets 1613 * announcing that the socket has gone away. 1614 */ 1615 if (TCPS_HAVERCVDSYN(cb->s_state)) { 1616 sppstat.spps_drops++; 1617 cb->s_state = TCPS_CLOSED; 1618 /*(void) tcp_output(cb);*/ 1619 } else 1620 sppstat.spps_conndrops++; 1621 so->so_error = errno; 1622 return (spp_close(cb)); 1623 } 1624 1625 spp_abort(nsp) 1626 struct nspcb *nsp; 1627 { 1628 1629 (void) spp_close((struct sppcb *)nsp->nsp_pcb); 1630 } 1631 1632 int spp_backoff[SPP_MAXRXTSHIFT+1] = 1633 { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; 1634 /* 1635 * Fast timeout routine for processing delayed acks 1636 */ 1637 spp_fasttimo() 1638 { 1639 register struct nspcb *nsp; 1640 register struct sppcb *cb; 1641 int s = splnet(); 1642 1643 nsp = nspcb.nsp_next; 1644 if (nsp) 1645 for (; nsp != &nspcb; nsp = nsp->nsp_next) 1646 if ((cb = (struct sppcb *)nsp->nsp_pcb) && 1647 (cb->s_flags & SF_DELACK)) { 1648 cb->s_flags &= ~SF_DELACK; 1649 cb->s_flags |= SF_ACKNOW; 1650 sppstat.spps_delack++; 1651 (void) spp_output(cb, (struct mbuf *) 0); 1652 } 1653 splx(s); 1654 } 1655 1656 /* 1657 * spp protocol timeout routine called every 500 ms. 1658 * Updates the timers in all active pcb's and 1659 * causes finite state machine actions if timers expire. 1660 */ 1661 spp_slowtimo() 1662 { 1663 register struct nspcb *ip, *ipnxt; 1664 register struct sppcb *cb; 1665 int s = splnet(); 1666 register int i; 1667 1668 /* 1669 * Search through tcb's and update active timers. 1670 */ 1671 ip = nspcb.nsp_next; 1672 if (ip == 0) { 1673 splx(s); 1674 return; 1675 } 1676 while (ip != &nspcb) { 1677 cb = nstosppcb(ip); 1678 ipnxt = ip->nsp_next; 1679 if (cb == 0) 1680 goto tpgone; 1681 for (i = 0; i < SPPT_NTIMERS; i++) { 1682 if (cb->s_timer[i] && --cb->s_timer[i] == 0) { 1683 (void) spp_usrreq(cb->s_nspcb->nsp_socket, 1684 PRU_SLOWTIMO, (struct mbuf *)0, 1685 (struct mbuf *)i, (struct mbuf *)0, 1686 (struct mbuf *)0); 1687 if (ipnxt->nsp_prev != ip) 1688 goto tpgone; 1689 } 1690 } 1691 cb->s_idle++; 1692 if (cb->s_rtt) 1693 cb->s_rtt++; 1694 tpgone: 1695 ip = ipnxt; 1696 } 1697 spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */ 1698 splx(s); 1699 } 1700 /* 1701 * SPP timer processing. 1702 */ 1703 struct sppcb * 1704 spp_timers(cb, timer) 1705 register struct sppcb *cb; 1706 int timer; 1707 { 1708 long rexmt; 1709 int win; 1710 1711 cb->s_force = 1 + timer; 1712 switch (timer) { 1713 1714 /* 1715 * 2 MSL timeout in shutdown went off. TCP deletes connection 1716 * control block. 1717 */ 1718 case SPPT_2MSL: 1719 printf("spp: SPPT_2MSL went off for no reason\n"); 1720 cb->s_timer[timer] = 0; 1721 break; 1722 1723 /* 1724 * Retransmission timer went off. Message has not 1725 * been acked within retransmit interval. Back off 1726 * to a longer retransmit interval and retransmit one packet. 1727 */ 1728 case SPPT_REXMT: 1729 if (++cb->s_rxtshift > SPP_MAXRXTSHIFT) { 1730 cb->s_rxtshift = SPP_MAXRXTSHIFT; 1731 sppstat.spps_timeoutdrop++; 1732 cb = spp_drop(cb, ETIMEDOUT); 1733 break; 1734 } 1735 sppstat.spps_rexmttimeo++; 1736 rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1; 1737 rexmt *= spp_backoff[cb->s_rxtshift]; 1738 SPPT_RANGESET(cb->s_rxtcur, rexmt, SPPTV_MIN, SPPTV_REXMTMAX); 1739 cb->s_timer[SPPT_REXMT] = cb->s_rxtcur; 1740 /* 1741 * If we have backed off fairly far, our srtt 1742 * estimate is probably bogus. Clobber it 1743 * so we'll take the next rtt measurement as our srtt; 1744 * move the current srtt into rttvar to keep the current 1745 * retransmit times until then. 1746 */ 1747 if (cb->s_rxtshift > SPP_MAXRXTSHIFT / 4 ) { 1748 cb->s_rttvar += (cb->s_srtt >> 2); 1749 cb->s_srtt = 0; 1750 } 1751 cb->s_snxt = cb->s_rack; 1752 /* 1753 * If timing a packet, stop the timer. 1754 */ 1755 cb->s_rtt = 0; 1756 /* 1757 * See very long discussion in tcp_timer.c about congestion 1758 * window and sstrhesh 1759 */ 1760 win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2; 1761 if (win < 2) 1762 win = 2; 1763 cb->s_cwnd = CUNIT; 1764 cb->s_ssthresh = win * CUNIT; 1765 (void) spp_output(cb, (struct mbuf *) 0); 1766 break; 1767 1768 /* 1769 * Persistance timer into zero window. 1770 * Force a probe to be sent. 1771 */ 1772 case SPPT_PERSIST: 1773 sppstat.spps_persisttimeo++; 1774 spp_setpersist(cb); 1775 (void) spp_output(cb, (struct mbuf *) 0); 1776 break; 1777 1778 /* 1779 * Keep-alive timer went off; send something 1780 * or drop connection if idle for too long. 1781 */ 1782 case SPPT_KEEP: 1783 sppstat.spps_keeptimeo++; 1784 if (cb->s_state < TCPS_ESTABLISHED) 1785 goto dropit; 1786 if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) { 1787 if (cb->s_idle >= SPPTV_MAXIDLE) 1788 goto dropit; 1789 sppstat.spps_keepprobe++; 1790 (void) spp_output(cb, (struct mbuf *) 0); 1791 } else 1792 cb->s_idle = 0; 1793 cb->s_timer[SPPT_KEEP] = SPPTV_KEEP; 1794 break; 1795 dropit: 1796 sppstat.spps_keepdrops++; 1797 cb = spp_drop(cb, ETIMEDOUT); 1798 break; 1799 } 1800 return (cb); 1801 } 1802 #ifndef lint 1803 int SppcbSize = sizeof (struct sppcb); 1804 int NspcbSize = sizeof (struct nspcb); 1805 #endif /* lint */
Cache object: 91020cc58a21f5491b6c2857f153db99
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