spx_usrreq.c revision 130480
1/* 2 * Copyright (c) 1995, Mike Mitchell 3 * Copyright (c) 1984, 1985, 1986, 1987, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)spx_usrreq.h 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/netipx/spx_usrreq.c 130480 2004-06-14 18:16:22Z rwatson $"); 39 40#include <sys/param.h> 41#include <sys/lock.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/mutex.h> 45#include <sys/proc.h> 46#include <sys/protosw.h> 47#include <sys/signalvar.h> 48#include <sys/socket.h> 49#include <sys/socketvar.h> 50#include <sys/sx.h> 51#include <sys/systm.h> 52 53#include <net/route.h> 54#include <netinet/tcp_fsm.h> 55 56#include <netipx/ipx.h> 57#include <netipx/ipx_pcb.h> 58#include <netipx/ipx_var.h> 59#include <netipx/spx.h> 60#include <netipx/spx_debug.h> 61#include <netipx/spx_timer.h> 62#include <netipx/spx_var.h> 63 64/* 65 * SPX protocol implementation. 66 */ 67static u_short spx_iss; 68static u_short spx_newchecks[50]; 69static int spx_hardnosed; 70static int spx_use_delack = 0; 71static int traceallspxs = 0; 72static struct spx spx_savesi; 73static struct spx_istat spx_istat; 74 75/* Following was struct spxstat spxstat; */ 76#ifndef spxstat 77#define spxstat spx_istat.newstats 78#endif 79 80static int spx_backoff[SPX_MAXRXTSHIFT+1] = 81 { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; 82 83static struct spxpcb *spx_close(struct spxpcb *cb); 84static struct spxpcb *spx_disconnect(struct spxpcb *cb); 85static struct spxpcb *spx_drop(struct spxpcb *cb, int errno); 86static int spx_output(struct spxpcb *cb, struct mbuf *m0); 87static int spx_reass(struct spxpcb *cb, struct spx *si); 88static void spx_setpersist(struct spxpcb *cb); 89static void spx_template(struct spxpcb *cb); 90static struct spxpcb *spx_timers(struct spxpcb *cb, int timer); 91static struct spxpcb *spx_usrclosed(struct spxpcb *cb); 92 93static int spx_usr_abort(struct socket *so); 94static int spx_accept(struct socket *so, struct sockaddr **nam); 95static int spx_attach(struct socket *so, int proto, struct thread *td); 96static int spx_bind(struct socket *so, struct sockaddr *nam, struct thread *td); 97static int spx_connect(struct socket *so, struct sockaddr *nam, 98 struct thread *td); 99static int spx_detach(struct socket *so); 100static int spx_usr_disconnect(struct socket *so); 101static int spx_listen(struct socket *so, struct thread *td); 102static int spx_rcvd(struct socket *so, int flags); 103static int spx_rcvoob(struct socket *so, struct mbuf *m, int flags); 104static int spx_send(struct socket *so, int flags, struct mbuf *m, 105 struct sockaddr *addr, struct mbuf *control, 106 struct thread *td); 107static int spx_shutdown(struct socket *so); 108static int spx_sp_attach(struct socket *so, int proto, struct thread *td); 109 110struct pr_usrreqs spx_usrreqs = { 111 spx_usr_abort, spx_accept, spx_attach, spx_bind, 112 spx_connect, pru_connect2_notsupp, ipx_control, spx_detach, 113 spx_usr_disconnect, spx_listen, ipx_peeraddr, spx_rcvd, 114 spx_rcvoob, spx_send, pru_sense_null, spx_shutdown, 115 ipx_sockaddr, sosend, soreceive, sopoll, pru_sosetlabel_null 116}; 117 118struct pr_usrreqs spx_usrreq_sps = { 119 spx_usr_abort, spx_accept, spx_sp_attach, spx_bind, 120 spx_connect, pru_connect2_notsupp, ipx_control, spx_detach, 121 spx_usr_disconnect, spx_listen, ipx_peeraddr, spx_rcvd, 122 spx_rcvoob, spx_send, pru_sense_null, spx_shutdown, 123 ipx_sockaddr, sosend, soreceive, sopoll, pru_sosetlabel_null 124}; 125 126void 127spx_init() 128{ 129 130 spx_iss = 1; /* WRONG !! should fish it out of TODR */ 131} 132 133void 134spx_input(m, ipxp) 135 register struct mbuf *m; 136 register struct ipxpcb *ipxp; 137{ 138 register struct spxpcb *cb; 139 register struct spx *si = mtod(m, struct spx *); 140 register struct socket *so; 141 int dropsocket = 0; 142 short ostate = 0; 143 144 spxstat.spxs_rcvtotal++; 145 if (ipxp == NULL) { 146 panic("No ipxpcb in spx_input\n"); 147 return; 148 } 149 150 cb = ipxtospxpcb(ipxp); 151 if (cb == NULL) 152 goto bad; 153 154 if (m->m_len < sizeof(*si)) { 155 if ((m = m_pullup(m, sizeof(*si))) == NULL) { 156 spxstat.spxs_rcvshort++; 157 return; 158 } 159 si = mtod(m, struct spx *); 160 } 161 si->si_seq = ntohs(si->si_seq); 162 si->si_ack = ntohs(si->si_ack); 163 si->si_alo = ntohs(si->si_alo); 164 165 so = ipxp->ipxp_socket; 166 167 if (so->so_options & SO_DEBUG || traceallspxs) { 168 ostate = cb->s_state; 169 spx_savesi = *si; 170 } 171 if (so->so_options & SO_ACCEPTCONN) { 172 struct spxpcb *ocb = cb; 173 174 so = sonewconn(so, 0); 175 if (so == NULL) { 176 goto drop; 177 } 178 /* 179 * This is ugly, but .... 180 * 181 * Mark socket as temporary until we're 182 * committed to keeping it. The code at 183 * ``drop'' and ``dropwithreset'' check the 184 * flag dropsocket to see if the temporary 185 * socket created here should be discarded. 186 * We mark the socket as discardable until 187 * we're committed to it below in TCPS_LISTEN. 188 */ 189 dropsocket++; 190 ipxp = (struct ipxpcb *)so->so_pcb; 191 ipxp->ipxp_laddr = si->si_dna; 192 cb = ipxtospxpcb(ipxp); 193 cb->s_mtu = ocb->s_mtu; /* preserve sockopts */ 194 cb->s_flags = ocb->s_flags; /* preserve sockopts */ 195 cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */ 196 cb->s_state = TCPS_LISTEN; 197 } 198 199 /* 200 * Packet received on connection. 201 * reset idle time and keep-alive timer; 202 */ 203 cb->s_idle = 0; 204 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP; 205 206 switch (cb->s_state) { 207 208 case TCPS_LISTEN:{ 209 struct sockaddr_ipx *sipx, ssipx; 210 struct ipx_addr laddr; 211 212 /* 213 * If somebody here was carying on a conversation 214 * and went away, and his pen pal thinks he can 215 * still talk, we get the misdirected packet. 216 */ 217 if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) { 218 spx_istat.gonawy++; 219 goto dropwithreset; 220 } 221 sipx = &ssipx; 222 bzero(sipx, sizeof *sipx); 223 sipx->sipx_len = sizeof(*sipx); 224 sipx->sipx_family = AF_IPX; 225 sipx->sipx_addr = si->si_sna; 226 laddr = ipxp->ipxp_laddr; 227 if (ipx_nullhost(laddr)) 228 ipxp->ipxp_laddr = si->si_dna; 229 if (ipx_pcbconnect(ipxp, (struct sockaddr *)sipx, &thread0)) { 230 ipxp->ipxp_laddr = laddr; 231 spx_istat.noconn++; 232 goto drop; 233 } 234 spx_template(cb); 235 dropsocket = 0; /* committed to socket */ 236 cb->s_did = si->si_sid; 237 cb->s_rack = si->si_ack; 238 cb->s_ralo = si->si_alo; 239#define THREEWAYSHAKE 240#ifdef THREEWAYSHAKE 241 cb->s_state = TCPS_SYN_RECEIVED; 242 cb->s_force = 1 + SPXT_KEEP; 243 spxstat.spxs_accepts++; 244 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP; 245 } 246 break; 247 /* 248 * This state means that we have heard a response 249 * to our acceptance of their connection 250 * It is probably logically unnecessary in this 251 * implementation. 252 */ 253 case TCPS_SYN_RECEIVED: { 254 if (si->si_did != cb->s_sid) { 255 spx_istat.wrncon++; 256 goto drop; 257 } 258#endif 259 ipxp->ipxp_fport = si->si_sport; 260 cb->s_timer[SPXT_REXMT] = 0; 261 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP; 262 soisconnected(so); 263 cb->s_state = TCPS_ESTABLISHED; 264 spxstat.spxs_accepts++; 265 } 266 break; 267 268 /* 269 * This state means that we have gotten a response 270 * to our attempt to establish a connection. 271 * We fill in the data from the other side, 272 * telling us which port to respond to, instead of the well- 273 * known one we might have sent to in the first place. 274 * We also require that this is a response to our 275 * connection id. 276 */ 277 case TCPS_SYN_SENT: 278 if (si->si_did != cb->s_sid) { 279 spx_istat.notme++; 280 goto drop; 281 } 282 spxstat.spxs_connects++; 283 cb->s_did = si->si_sid; 284 cb->s_rack = si->si_ack; 285 cb->s_ralo = si->si_alo; 286 cb->s_dport = ipxp->ipxp_fport = si->si_sport; 287 cb->s_timer[SPXT_REXMT] = 0; 288 cb->s_flags |= SF_ACKNOW; 289 soisconnected(so); 290 cb->s_state = TCPS_ESTABLISHED; 291 /* Use roundtrip time of connection request for initial rtt */ 292 if (cb->s_rtt) { 293 cb->s_srtt = cb->s_rtt << 3; 294 cb->s_rttvar = cb->s_rtt << 1; 295 SPXT_RANGESET(cb->s_rxtcur, 296 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1, 297 SPXTV_MIN, SPXTV_REXMTMAX); 298 cb->s_rtt = 0; 299 } 300 } 301 if (so->so_options & SO_DEBUG || traceallspxs) 302 spx_trace(SA_INPUT, (u_char)ostate, cb, &spx_savesi, 0); 303 304 m->m_len -= sizeof(struct ipx); 305 m->m_pkthdr.len -= sizeof(struct ipx); 306 m->m_data += sizeof(struct ipx); 307 308 if (spx_reass(cb, si)) { 309 m_freem(m); 310 } 311 if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT))) 312 spx_output(cb, (struct mbuf *)NULL); 313 cb->s_flags &= ~(SF_WIN|SF_RXT); 314 return; 315 316dropwithreset: 317 if (dropsocket) 318 soabort(so); 319 si->si_seq = ntohs(si->si_seq); 320 si->si_ack = ntohs(si->si_ack); 321 si->si_alo = ntohs(si->si_alo); 322 m_freem(dtom(si)); 323 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs) 324 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0); 325 return; 326 327drop: 328bad: 329 if (cb == 0 || cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || 330 traceallspxs) 331 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0); 332 m_freem(m); 333} 334 335static int spxrexmtthresh = 3; 336 337/* 338 * This is structurally similar to the tcp reassembly routine 339 * but its function is somewhat different: It merely queues 340 * packets up, and suppresses duplicates. 341 */ 342static int 343spx_reass(cb, si) 344register struct spxpcb *cb; 345register struct spx *si; 346{ 347 register struct spx_q *q; 348 register struct mbuf *m; 349 register struct socket *so = cb->s_ipxpcb->ipxp_socket; 350 char packetp = cb->s_flags & SF_HI; 351 int incr; 352 char wakeup = 0; 353 354 if (si == SI(0)) 355 goto present; 356 /* 357 * Update our news from them. 358 */ 359 if (si->si_cc & SPX_SA) 360 cb->s_flags |= (spx_use_delack ? SF_DELACK : SF_ACKNOW); 361 if (SSEQ_GT(si->si_alo, cb->s_ralo)) 362 cb->s_flags |= SF_WIN; 363 if (SSEQ_LEQ(si->si_ack, cb->s_rack)) { 364 if ((si->si_cc & SPX_SP) && cb->s_rack != (cb->s_smax + 1)) { 365 spxstat.spxs_rcvdupack++; 366 /* 367 * If this is a completely duplicate ack 368 * and other conditions hold, we assume 369 * a packet has been dropped and retransmit 370 * it exactly as in tcp_input(). 371 */ 372 if (si->si_ack != cb->s_rack || 373 si->si_alo != cb->s_ralo) 374 cb->s_dupacks = 0; 375 else if (++cb->s_dupacks == spxrexmtthresh) { 376 u_short onxt = cb->s_snxt; 377 int cwnd = cb->s_cwnd; 378 379 cb->s_snxt = si->si_ack; 380 cb->s_cwnd = CUNIT; 381 cb->s_force = 1 + SPXT_REXMT; 382 spx_output(cb, (struct mbuf *)NULL); 383 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur; 384 cb->s_rtt = 0; 385 if (cwnd >= 4 * CUNIT) 386 cb->s_cwnd = cwnd / 2; 387 if (SSEQ_GT(onxt, cb->s_snxt)) 388 cb->s_snxt = onxt; 389 return (1); 390 } 391 } else 392 cb->s_dupacks = 0; 393 goto update_window; 394 } 395 cb->s_dupacks = 0; 396 /* 397 * If our correspondent acknowledges data we haven't sent 398 * TCP would drop the packet after acking. We'll be a little 399 * more permissive 400 */ 401 if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) { 402 spxstat.spxs_rcvacktoomuch++; 403 si->si_ack = cb->s_smax + 1; 404 } 405 spxstat.spxs_rcvackpack++; 406 /* 407 * If transmit timer is running and timed sequence 408 * number was acked, update smoothed round trip time. 409 * See discussion of algorithm in tcp_input.c 410 */ 411 if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) { 412 spxstat.spxs_rttupdated++; 413 if (cb->s_srtt != 0) { 414 register short delta; 415 delta = cb->s_rtt - (cb->s_srtt >> 3); 416 if ((cb->s_srtt += delta) <= 0) 417 cb->s_srtt = 1; 418 if (delta < 0) 419 delta = -delta; 420 delta -= (cb->s_rttvar >> 2); 421 if ((cb->s_rttvar += delta) <= 0) 422 cb->s_rttvar = 1; 423 } else { 424 /* 425 * No rtt measurement yet 426 */ 427 cb->s_srtt = cb->s_rtt << 3; 428 cb->s_rttvar = cb->s_rtt << 1; 429 } 430 cb->s_rtt = 0; 431 cb->s_rxtshift = 0; 432 SPXT_RANGESET(cb->s_rxtcur, 433 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1, 434 SPXTV_MIN, SPXTV_REXMTMAX); 435 } 436 /* 437 * If all outstanding data is acked, stop retransmit 438 * timer and remember to restart (more output or persist). 439 * If there is more data to be acked, restart retransmit 440 * timer, using current (possibly backed-off) value; 441 */ 442 if (si->si_ack == cb->s_smax + 1) { 443 cb->s_timer[SPXT_REXMT] = 0; 444 cb->s_flags |= SF_RXT; 445 } else if (cb->s_timer[SPXT_PERSIST] == 0) 446 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur; 447 /* 448 * When new data is acked, open the congestion window. 449 * If the window gives us less than ssthresh packets 450 * in flight, open exponentially (maxseg at a time). 451 * Otherwise open linearly (maxseg^2 / cwnd at a time). 452 */ 453 incr = CUNIT; 454 if (cb->s_cwnd > cb->s_ssthresh) 455 incr = max(incr * incr / cb->s_cwnd, 1); 456 cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx); 457 /* 458 * Trim Acked data from output queue. 459 */ 460 while ((m = so->so_snd.sb_mb) != NULL) { 461 if (SSEQ_LT((mtod(m, struct spx *))->si_seq, si->si_ack)) 462 sbdroprecord(&so->so_snd); 463 else 464 break; 465 } 466 sowwakeup(so); 467 cb->s_rack = si->si_ack; 468update_window: 469 if (SSEQ_LT(cb->s_snxt, cb->s_rack)) 470 cb->s_snxt = cb->s_rack; 471 if (SSEQ_LT(cb->s_swl1, si->si_seq) || ((cb->s_swl1 == si->si_seq && 472 (SSEQ_LT(cb->s_swl2, si->si_ack))) || 473 (cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo)))) { 474 /* keep track of pure window updates */ 475 if ((si->si_cc & SPX_SP) && cb->s_swl2 == si->si_ack 476 && SSEQ_LT(cb->s_ralo, si->si_alo)) { 477 spxstat.spxs_rcvwinupd++; 478 spxstat.spxs_rcvdupack--; 479 } 480 cb->s_ralo = si->si_alo; 481 cb->s_swl1 = si->si_seq; 482 cb->s_swl2 = si->si_ack; 483 cb->s_swnd = (1 + si->si_alo - si->si_ack); 484 if (cb->s_swnd > cb->s_smxw) 485 cb->s_smxw = cb->s_swnd; 486 cb->s_flags |= SF_WIN; 487 } 488 /* 489 * If this packet number is higher than that which 490 * we have allocated refuse it, unless urgent 491 */ 492 if (SSEQ_GT(si->si_seq, cb->s_alo)) { 493 if (si->si_cc & SPX_SP) { 494 spxstat.spxs_rcvwinprobe++; 495 return (1); 496 } else 497 spxstat.spxs_rcvpackafterwin++; 498 if (si->si_cc & SPX_OB) { 499 if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) { 500 m_freem(dtom(si)); 501 return (0); 502 } /* else queue this packet; */ 503 } else { 504 /*register struct socket *so = cb->s_ipxpcb->ipxp_socket; 505 if (so->so_state && SS_NOFDREF) { 506 spx_close(cb); 507 } else 508 would crash system*/ 509 spx_istat.notyet++; 510 m_freem(dtom(si)); 511 return (0); 512 } 513 } 514 /* 515 * If this is a system packet, we don't need to 516 * queue it up, and won't update acknowledge # 517 */ 518 if (si->si_cc & SPX_SP) { 519 return (1); 520 } 521 /* 522 * We have already seen this packet, so drop. 523 */ 524 if (SSEQ_LT(si->si_seq, cb->s_ack)) { 525 spx_istat.bdreas++; 526 spxstat.spxs_rcvduppack++; 527 if (si->si_seq == cb->s_ack - 1) 528 spx_istat.lstdup++; 529 return (1); 530 } 531 /* 532 * Loop through all packets queued up to insert in 533 * appropriate sequence. 534 */ 535 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) { 536 if (si->si_seq == SI(q)->si_seq) { 537 spxstat.spxs_rcvduppack++; 538 return (1); 539 } 540 if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) { 541 spxstat.spxs_rcvoopack++; 542 break; 543 } 544 } 545 insque(si, q->si_prev); 546 /* 547 * If this packet is urgent, inform process 548 */ 549 if (si->si_cc & SPX_OB) { 550 cb->s_iobc = ((char *)si)[1 + sizeof(*si)]; 551 sohasoutofband(so); 552 cb->s_oobflags |= SF_IOOB; 553 } 554present: 555#define SPINC sizeof(struct spxhdr) 556 /* 557 * Loop through all packets queued up to update acknowledge 558 * number, and present all acknowledged data to user; 559 * If in packet interface mode, show packet headers. 560 */ 561 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) { 562 if (SI(q)->si_seq == cb->s_ack) { 563 cb->s_ack++; 564 m = dtom(q); 565 if (SI(q)->si_cc & SPX_OB) { 566 cb->s_oobflags &= ~SF_IOOB; 567 if (so->so_rcv.sb_cc) 568 so->so_oobmark = so->so_rcv.sb_cc; 569 else 570 so->so_rcv.sb_state |= SBS_RCVATMARK; 571 } 572 q = q->si_prev; 573 remque(q->si_next); 574 wakeup = 1; 575 spxstat.spxs_rcvpack++; 576#ifdef SF_NEWCALL 577 if (cb->s_flags2 & SF_NEWCALL) { 578 struct spxhdr *sp = mtod(m, struct spxhdr *); 579 u_char dt = sp->spx_dt; 580 spx_newchecks[4]++; 581 if (dt != cb->s_rhdr.spx_dt) { 582 struct mbuf *mm = 583 m_getclr(M_DONTWAIT, MT_CONTROL); 584 spx_newchecks[0]++; 585 if (mm != NULL) { 586 u_short *s = 587 mtod(mm, u_short *); 588 cb->s_rhdr.spx_dt = dt; 589 mm->m_len = 5; /*XXX*/ 590 s[0] = 5; 591 s[1] = 1; 592 *(u_char *)(&s[2]) = dt; 593 sbappend(&so->so_rcv, mm); 594 } 595 } 596 if (sp->spx_cc & SPX_OB) { 597 MCHTYPE(m, MT_OOBDATA); 598 spx_newchecks[1]++; 599 so->so_oobmark = 0; 600 so->so_rcv.sb_state &= ~SBS_RCVATMARK; 601 } 602 if (packetp == 0) { 603 m->m_data += SPINC; 604 m->m_len -= SPINC; 605 m->m_pkthdr.len -= SPINC; 606 } 607 if ((sp->spx_cc & SPX_EM) || packetp) { 608 sbappendrecord(&so->so_rcv, m); 609 spx_newchecks[9]++; 610 } else 611 sbappend(&so->so_rcv, m); 612 } else 613#endif 614 if (packetp) { 615 sbappendrecord(&so->so_rcv, m); 616 } else { 617 cb->s_rhdr = *mtod(m, struct spxhdr *); 618 m->m_data += SPINC; 619 m->m_len -= SPINC; 620 m->m_pkthdr.len -= SPINC; 621 sbappend(&so->so_rcv, m); 622 } 623 } else 624 break; 625 } 626 if (wakeup) 627 sorwakeup(so); 628 return (0); 629} 630 631void 632spx_ctlinput(cmd, arg_as_sa, dummy) 633 int cmd; 634 struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */ 635 void *dummy; 636{ 637 caddr_t arg = (/* XXX */ caddr_t)arg_as_sa; 638 struct ipx_addr *na; 639 struct sockaddr_ipx *sipx; 640 641 if (cmd < 0 || cmd >= PRC_NCMDS) 642 return; 643 644 switch (cmd) { 645 646 case PRC_ROUTEDEAD: 647 return; 648 649 case PRC_IFDOWN: 650 case PRC_HOSTDEAD: 651 case PRC_HOSTUNREACH: 652 sipx = (struct sockaddr_ipx *)arg; 653 if (sipx->sipx_family != AF_IPX) 654 return; 655 na = &sipx->sipx_addr; 656 break; 657 658 default: 659 break; 660 } 661} 662 663#ifdef notdef 664int 665spx_fixmtu(ipxp) 666register struct ipxpcb *ipxp; 667{ 668 register struct spxpcb *cb = (struct spxpcb *)(ipxp->ipxp_pcb); 669 register struct mbuf *m; 670 register struct spx *si; 671 struct ipx_errp *ep; 672 struct sockbuf *sb; 673 int badseq, len; 674 struct mbuf *firstbad, *m0; 675 676 if (cb != NULL) { 677 /* 678 * The notification that we have sent 679 * too much is bad news -- we will 680 * have to go through queued up so far 681 * splitting ones which are too big and 682 * reassigning sequence numbers and checksums. 683 * we should then retransmit all packets from 684 * one above the offending packet to the last one 685 * we had sent (or our allocation) 686 * then the offending one so that the any queued 687 * data at our destination will be discarded. 688 */ 689 ep = (struct ipx_errp *)ipxp->ipxp_notify_param; 690 sb = &ipxp->ipxp_socket->so_snd; 691 cb->s_mtu = ep->ipx_err_param; 692 badseq = SI(&ep->ipx_err_ipx)->si_seq; 693 for (m = sb->sb_mb; m != NULL; m = m->m_act) { 694 si = mtod(m, struct spx *); 695 if (si->si_seq == badseq) 696 break; 697 } 698 if (m == NULL) 699 return; 700 firstbad = m; 701 /*for (;;) {*/ 702 /* calculate length */ 703 for (m0 = m, len = 0; m != NULL; m = m->m_next) 704 len += m->m_len; 705 if (len > cb->s_mtu) { 706 } 707 /* FINISH THIS 708 } */ 709 } 710} 711#endif 712 713static int 714spx_output(cb, m0) 715 register struct spxpcb *cb; 716 struct mbuf *m0; 717{ 718 struct socket *so = cb->s_ipxpcb->ipxp_socket; 719 register struct mbuf *m; 720 register struct spx *si = (struct spx *)NULL; 721 register struct sockbuf *sb = &so->so_snd; 722 int len = 0, win, rcv_win; 723 short span, off, recordp = 0; 724 u_short alo; 725 int error = 0, sendalot; 726#ifdef notdef 727 int idle; 728#endif 729 struct mbuf *mprev; 730 731 if (m0 != NULL) { 732 int mtu = cb->s_mtu; 733 int datalen; 734 /* 735 * Make sure that packet isn't too big. 736 */ 737 for (m = m0; m != NULL; m = m->m_next) { 738 mprev = m; 739 len += m->m_len; 740 if (m->m_flags & M_EOR) 741 recordp = 1; 742 } 743 datalen = (cb->s_flags & SF_HO) ? 744 len - sizeof(struct spxhdr) : len; 745 if (datalen > mtu) { 746 if (cb->s_flags & SF_PI) { 747 m_freem(m0); 748 return (EMSGSIZE); 749 } else { 750 int oldEM = cb->s_cc & SPX_EM; 751 752 cb->s_cc &= ~SPX_EM; 753 while (len > mtu) { 754 /* 755 * Here we are only being called 756 * from usrreq(), so it is OK to 757 * block. 758 */ 759 m = m_copym(m0, 0, mtu, M_TRYWAIT); 760 if (cb->s_flags & SF_NEWCALL) { 761 struct mbuf *mm = m; 762 spx_newchecks[7]++; 763 while (mm != NULL) { 764 mm->m_flags &= ~M_EOR; 765 mm = mm->m_next; 766 } 767 } 768 error = spx_output(cb, m); 769 if (error) { 770 cb->s_cc |= oldEM; 771 m_freem(m0); 772 return (error); 773 } 774 m_adj(m0, mtu); 775 len -= mtu; 776 } 777 cb->s_cc |= oldEM; 778 } 779 } 780 /* 781 * Force length even, by adding a "garbage byte" if 782 * necessary. 783 */ 784 if (len & 1) { 785 m = mprev; 786 if (M_TRAILINGSPACE(m) >= 1) 787 m->m_len++; 788 else { 789 struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA); 790 791 if (m1 == NULL) { 792 m_freem(m0); 793 return (ENOBUFS); 794 } 795 m1->m_len = 1; 796 *(mtod(m1, u_char *)) = 0; 797 m->m_next = m1; 798 } 799 } 800 m = m_gethdr(M_DONTWAIT, MT_HEADER); 801 if (m == NULL) { 802 m_freem(m0); 803 return (ENOBUFS); 804 } 805 /* 806 * Fill in mbuf with extended SP header 807 * and addresses and length put into network format. 808 */ 809 MH_ALIGN(m, sizeof(struct spx)); 810 m->m_len = sizeof(struct spx); 811 m->m_next = m0; 812 si = mtod(m, struct spx *); 813 si->si_i = *cb->s_ipx; 814 si->si_s = cb->s_shdr; 815 if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) { 816 register struct spxhdr *sh; 817 if (m0->m_len < sizeof(*sh)) { 818 if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) { 819 m_free(m); 820 m_freem(m0); 821 return (EINVAL); 822 } 823 m->m_next = m0; 824 } 825 sh = mtod(m0, struct spxhdr *); 826 si->si_dt = sh->spx_dt; 827 si->si_cc |= sh->spx_cc & SPX_EM; 828 m0->m_len -= sizeof(*sh); 829 m0->m_data += sizeof(*sh); 830 len -= sizeof(*sh); 831 } 832 len += sizeof(*si); 833 if ((cb->s_flags2 & SF_NEWCALL) && recordp) { 834 si->si_cc |= SPX_EM; 835 spx_newchecks[8]++; 836 } 837 if (cb->s_oobflags & SF_SOOB) { 838 /* 839 * Per jqj@cornell: 840 * make sure OB packets convey exactly 1 byte. 841 * If the packet is 1 byte or larger, we 842 * have already guaranted there to be at least 843 * one garbage byte for the checksum, and 844 * extra bytes shouldn't hurt! 845 */ 846 if (len > sizeof(*si)) { 847 si->si_cc |= SPX_OB; 848 len = (1 + sizeof(*si)); 849 } 850 } 851 si->si_len = htons((u_short)len); 852 m->m_pkthdr.len = ((len - 1) | 1) + 1; 853 /* 854 * queue stuff up for output 855 */ 856 sbappendrecord(sb, m); 857 cb->s_seq++; 858 } 859#ifdef notdef 860 idle = (cb->s_smax == (cb->s_rack - 1)); 861#endif 862again: 863 sendalot = 0; 864 off = cb->s_snxt - cb->s_rack; 865 win = min(cb->s_swnd, (cb->s_cwnd / CUNIT)); 866 867 /* 868 * If in persist timeout with window of 0, send a probe. 869 * Otherwise, if window is small but nonzero 870 * and timer expired, send what we can and go into 871 * transmit state. 872 */ 873 if (cb->s_force == 1 + SPXT_PERSIST) { 874 if (win != 0) { 875 cb->s_timer[SPXT_PERSIST] = 0; 876 cb->s_rxtshift = 0; 877 } 878 } 879 span = cb->s_seq - cb->s_rack; 880 len = min(span, win) - off; 881 882 if (len < 0) { 883 /* 884 * Window shrank after we went into it. 885 * If window shrank to 0, cancel pending 886 * restransmission and pull s_snxt back 887 * to (closed) window. We will enter persist 888 * state below. If the widndow didn't close completely, 889 * just wait for an ACK. 890 */ 891 len = 0; 892 if (win == 0) { 893 cb->s_timer[SPXT_REXMT] = 0; 894 cb->s_snxt = cb->s_rack; 895 } 896 } 897 if (len > 1) 898 sendalot = 1; 899 rcv_win = sbspace(&so->so_rcv); 900 901 /* 902 * Send if we owe peer an ACK. 903 */ 904 if (cb->s_oobflags & SF_SOOB) { 905 /* 906 * must transmit this out of band packet 907 */ 908 cb->s_oobflags &= ~ SF_SOOB; 909 sendalot = 1; 910 spxstat.spxs_sndurg++; 911 goto found; 912 } 913 if (cb->s_flags & SF_ACKNOW) 914 goto send; 915 if (cb->s_state < TCPS_ESTABLISHED) 916 goto send; 917 /* 918 * Silly window can't happen in spx. 919 * Code from tcp deleted. 920 */ 921 if (len) 922 goto send; 923 /* 924 * Compare available window to amount of window 925 * known to peer (as advertised window less 926 * next expected input.) If the difference is at least two 927 * packets or at least 35% of the mximum possible window, 928 * then want to send a window update to peer. 929 */ 930 if (rcv_win > 0) { 931 u_short delta = 1 + cb->s_alo - cb->s_ack; 932 int adv = rcv_win - (delta * cb->s_mtu); 933 934 if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) || 935 (100 * adv / so->so_rcv.sb_hiwat >= 35)) { 936 spxstat.spxs_sndwinup++; 937 cb->s_flags |= SF_ACKNOW; 938 goto send; 939 } 940 941 } 942 /* 943 * Many comments from tcp_output.c are appropriate here 944 * including . . . 945 * If send window is too small, there is data to transmit, and no 946 * retransmit or persist is pending, then go to persist state. 947 * If nothing happens soon, send when timer expires: 948 * if window is nonzero, transmit what we can, 949 * otherwise send a probe. 950 */ 951 if (so->so_snd.sb_cc && cb->s_timer[SPXT_REXMT] == 0 && 952 cb->s_timer[SPXT_PERSIST] == 0) { 953 cb->s_rxtshift = 0; 954 spx_setpersist(cb); 955 } 956 /* 957 * No reason to send a packet, just return. 958 */ 959 cb->s_outx = 1; 960 return (0); 961 962send: 963 /* 964 * Find requested packet. 965 */ 966 si = 0; 967 if (len > 0) { 968 cb->s_want = cb->s_snxt; 969 for (m = sb->sb_mb; m != NULL; m = m->m_act) { 970 si = mtod(m, struct spx *); 971 if (SSEQ_LEQ(cb->s_snxt, si->si_seq)) 972 break; 973 } 974 found: 975 if (si != NULL) { 976 if (si->si_seq == cb->s_snxt) 977 cb->s_snxt++; 978 else 979 spxstat.spxs_sndvoid++, si = 0; 980 } 981 } 982 /* 983 * update window 984 */ 985 if (rcv_win < 0) 986 rcv_win = 0; 987 alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu)); 988 if (SSEQ_LT(alo, cb->s_alo)) 989 alo = cb->s_alo; 990 991 if (si != NULL) { 992 /* 993 * must make a copy of this packet for 994 * ipx_output to monkey with 995 */ 996 m = m_copy(dtom(si), 0, (int)M_COPYALL); 997 if (m == NULL) { 998 return (ENOBUFS); 999 } 1000 si = mtod(m, struct spx *); 1001 if (SSEQ_LT(si->si_seq, cb->s_smax)) 1002 spxstat.spxs_sndrexmitpack++; 1003 else 1004 spxstat.spxs_sndpack++; 1005 } else if (cb->s_force || cb->s_flags & SF_ACKNOW) { 1006 /* 1007 * Must send an acknowledgement or a probe 1008 */ 1009 if (cb->s_force) 1010 spxstat.spxs_sndprobe++; 1011 if (cb->s_flags & SF_ACKNOW) 1012 spxstat.spxs_sndacks++; 1013 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1014 if (m == NULL) 1015 return (ENOBUFS); 1016 /* 1017 * Fill in mbuf with extended SP header 1018 * and addresses and length put into network format. 1019 */ 1020 MH_ALIGN(m, sizeof(struct spx)); 1021 m->m_len = sizeof(*si); 1022 m->m_pkthdr.len = sizeof(*si); 1023 si = mtod(m, struct spx *); 1024 si->si_i = *cb->s_ipx; 1025 si->si_s = cb->s_shdr; 1026 si->si_seq = cb->s_smax + 1; 1027 si->si_len = htons(sizeof(*si)); 1028 si->si_cc |= SPX_SP; 1029 } else { 1030 cb->s_outx = 3; 1031 if (so->so_options & SO_DEBUG || traceallspxs) 1032 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0); 1033 return (0); 1034 } 1035 /* 1036 * Stuff checksum and output datagram. 1037 */ 1038 if ((si->si_cc & SPX_SP) == 0) { 1039 if (cb->s_force != (1 + SPXT_PERSIST) || 1040 cb->s_timer[SPXT_PERSIST] == 0) { 1041 /* 1042 * If this is a new packet and we are not currently 1043 * timing anything, time this one. 1044 */ 1045 if (SSEQ_LT(cb->s_smax, si->si_seq)) { 1046 cb->s_smax = si->si_seq; 1047 if (cb->s_rtt == 0) { 1048 spxstat.spxs_segstimed++; 1049 cb->s_rtseq = si->si_seq; 1050 cb->s_rtt = 1; 1051 } 1052 } 1053 /* 1054 * Set rexmt timer if not currently set, 1055 * Initial value for retransmit timer is smoothed 1056 * round-trip time + 2 * round-trip time variance. 1057 * Initialize shift counter which is used for backoff 1058 * of retransmit time. 1059 */ 1060 if (cb->s_timer[SPXT_REXMT] == 0 && 1061 cb->s_snxt != cb->s_rack) { 1062 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur; 1063 if (cb->s_timer[SPXT_PERSIST]) { 1064 cb->s_timer[SPXT_PERSIST] = 0; 1065 cb->s_rxtshift = 0; 1066 } 1067 } 1068 } else if (SSEQ_LT(cb->s_smax, si->si_seq)) { 1069 cb->s_smax = si->si_seq; 1070 } 1071 } else if (cb->s_state < TCPS_ESTABLISHED) { 1072 if (cb->s_rtt == 0) 1073 cb->s_rtt = 1; /* Time initial handshake */ 1074 if (cb->s_timer[SPXT_REXMT] == 0) 1075 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur; 1076 } 1077 { 1078 /* 1079 * Do not request acks when we ack their data packets or 1080 * when we do a gratuitous window update. 1081 */ 1082 if (((si->si_cc & SPX_SP) == 0) || cb->s_force) 1083 si->si_cc |= SPX_SA; 1084 si->si_seq = htons(si->si_seq); 1085 si->si_alo = htons(alo); 1086 si->si_ack = htons(cb->s_ack); 1087 1088 if (ipxcksum) { 1089 si->si_sum = ipx_cksum(m, ntohs(si->si_len)); 1090 } else 1091 si->si_sum = 0xffff; 1092 1093 cb->s_outx = 4; 1094 if (so->so_options & SO_DEBUG || traceallspxs) 1095 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0); 1096 1097 if (so->so_options & SO_DONTROUTE) 1098 error = ipx_outputfl(m, (struct route *)NULL, IPX_ROUTETOIF); 1099 else 1100 error = ipx_outputfl(m, &cb->s_ipxpcb->ipxp_route, 0); 1101 } 1102 if (error) { 1103 return (error); 1104 } 1105 spxstat.spxs_sndtotal++; 1106 /* 1107 * Data sent (as far as we can tell). 1108 * If this advertises a larger window than any other segment, 1109 * then remember the size of the advertized window. 1110 * Any pending ACK has now been sent. 1111 */ 1112 cb->s_force = 0; 1113 cb->s_flags &= ~(SF_ACKNOW|SF_DELACK); 1114 if (SSEQ_GT(alo, cb->s_alo)) 1115 cb->s_alo = alo; 1116 if (sendalot) 1117 goto again; 1118 cb->s_outx = 5; 1119 return (0); 1120} 1121 1122static int spx_do_persist_panics = 0; 1123 1124static void 1125spx_setpersist(cb) 1126 register struct spxpcb *cb; 1127{ 1128 register int t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1; 1129 1130 if (cb->s_timer[SPXT_REXMT] && spx_do_persist_panics) 1131 panic("spx_output REXMT"); 1132 /* 1133 * Start/restart persistance timer. 1134 */ 1135 SPXT_RANGESET(cb->s_timer[SPXT_PERSIST], 1136 t*spx_backoff[cb->s_rxtshift], 1137 SPXTV_PERSMIN, SPXTV_PERSMAX); 1138 if (cb->s_rxtshift < SPX_MAXRXTSHIFT) 1139 cb->s_rxtshift++; 1140} 1141 1142int 1143spx_ctloutput(so, sopt) 1144 struct socket *so; 1145 struct sockopt *sopt; 1146{ 1147 struct ipxpcb *ipxp = sotoipxpcb(so); 1148 register struct spxpcb *cb; 1149 int mask, error; 1150 short soptval; 1151 u_short usoptval; 1152 int optval; 1153 1154 error = 0; 1155 1156 if (sopt->sopt_level != IPXPROTO_SPX) { 1157 /* This will have to be changed when we do more general 1158 stacking of protocols */ 1159 return (ipx_ctloutput(so, sopt)); 1160 } 1161 if (ipxp == NULL) 1162 return (EINVAL); 1163 else 1164 cb = ipxtospxpcb(ipxp); 1165 1166 switch (sopt->sopt_dir) { 1167 case SOPT_GET: 1168 switch (sopt->sopt_name) { 1169 case SO_HEADERS_ON_INPUT: 1170 mask = SF_HI; 1171 goto get_flags; 1172 1173 case SO_HEADERS_ON_OUTPUT: 1174 mask = SF_HO; 1175 get_flags: 1176 soptval = cb->s_flags & mask; 1177 error = sooptcopyout(sopt, &soptval, sizeof soptval); 1178 break; 1179 1180 case SO_MTU: 1181 usoptval = cb->s_mtu; 1182 error = sooptcopyout(sopt, &usoptval, sizeof usoptval); 1183 break; 1184 1185 case SO_LAST_HEADER: 1186 error = sooptcopyout(sopt, &cb->s_rhdr, 1187 sizeof cb->s_rhdr); 1188 break; 1189 1190 case SO_DEFAULT_HEADERS: 1191 error = sooptcopyout(sopt, &cb->s_shdr, 1192 sizeof cb->s_shdr); 1193 break; 1194 1195 default: 1196 error = ENOPROTOOPT; 1197 } 1198 break; 1199 1200 case SOPT_SET: 1201 switch (sopt->sopt_name) { 1202 /* XXX why are these shorts on get and ints on set? 1203 that doesn't make any sense... */ 1204 case SO_HEADERS_ON_INPUT: 1205 mask = SF_HI; 1206 goto set_head; 1207 1208 case SO_HEADERS_ON_OUTPUT: 1209 mask = SF_HO; 1210 set_head: 1211 error = sooptcopyin(sopt, &optval, sizeof optval, 1212 sizeof optval); 1213 if (error) 1214 break; 1215 1216 if (cb->s_flags & SF_PI) { 1217 if (optval) 1218 cb->s_flags |= mask; 1219 else 1220 cb->s_flags &= ~mask; 1221 } else error = EINVAL; 1222 break; 1223 1224 case SO_MTU: 1225 error = sooptcopyin(sopt, &usoptval, sizeof usoptval, 1226 sizeof usoptval); 1227 if (error) 1228 break; 1229 cb->s_mtu = usoptval; 1230 break; 1231 1232#ifdef SF_NEWCALL 1233 case SO_NEWCALL: 1234 error = sooptcopyin(sopt, &optval, sizeof optval, 1235 sizeof optval); 1236 if (error) 1237 break; 1238 if (optval) { 1239 cb->s_flags2 |= SF_NEWCALL; 1240 spx_newchecks[5]++; 1241 } else { 1242 cb->s_flags2 &= ~SF_NEWCALL; 1243 spx_newchecks[6]++; 1244 } 1245 break; 1246#endif 1247 1248 case SO_DEFAULT_HEADERS: 1249 { 1250 struct spxhdr sp; 1251 1252 error = sooptcopyin(sopt, &sp, sizeof sp, 1253 sizeof sp); 1254 if (error) 1255 break; 1256 cb->s_dt = sp.spx_dt; 1257 cb->s_cc = sp.spx_cc & SPX_EM; 1258 } 1259 break; 1260 1261 default: 1262 error = ENOPROTOOPT; 1263 } 1264 break; 1265 } 1266 return (error); 1267} 1268 1269static int 1270spx_usr_abort(so) 1271 struct socket *so; 1272{ 1273 int s; 1274 struct ipxpcb *ipxp; 1275 struct spxpcb *cb; 1276 1277 ipxp = sotoipxpcb(so); 1278 cb = ipxtospxpcb(ipxp); 1279 1280 s = splnet(); 1281 spx_drop(cb, ECONNABORTED); 1282 splx(s); 1283 return (0); 1284} 1285 1286/* 1287 * Accept a connection. Essentially all the work is 1288 * done at higher levels; just return the address 1289 * of the peer, storing through addr. 1290 */ 1291static int 1292spx_accept(so, nam) 1293 struct socket *so; 1294 struct sockaddr **nam; 1295{ 1296 struct ipxpcb *ipxp; 1297 struct sockaddr_ipx *sipx, ssipx; 1298 1299 ipxp = sotoipxpcb(so); 1300 sipx = &ssipx; 1301 bzero(sipx, sizeof *sipx); 1302 sipx->sipx_len = sizeof *sipx; 1303 sipx->sipx_family = AF_IPX; 1304 sipx->sipx_addr = ipxp->ipxp_faddr; 1305 *nam = sodupsockaddr((struct sockaddr *)sipx, M_NOWAIT); 1306 return (0); 1307} 1308 1309static int 1310spx_attach(so, proto, td) 1311 struct socket *so; 1312 int proto; 1313 struct thread *td; 1314{ 1315 int error; 1316 int s; 1317 struct ipxpcb *ipxp; 1318 struct spxpcb *cb; 1319 struct mbuf *mm; 1320 struct sockbuf *sb; 1321 1322 ipxp = sotoipxpcb(so); 1323 cb = ipxtospxpcb(ipxp); 1324 1325 if (ipxp != NULL) 1326 return (EISCONN); 1327 s = splnet(); 1328 error = ipx_pcballoc(so, &ipxpcb, td); 1329 if (error) 1330 goto spx_attach_end; 1331 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1332 error = soreserve(so, (u_long) 3072, (u_long) 3072); 1333 if (error) 1334 goto spx_attach_end; 1335 } 1336 ipxp = sotoipxpcb(so); 1337 1338 MALLOC(cb, struct spxpcb *, sizeof *cb, M_PCB, M_NOWAIT | M_ZERO); 1339 1340 if (cb == NULL) { 1341 error = ENOBUFS; 1342 goto spx_attach_end; 1343 } 1344 sb = &so->so_snd; 1345 1346 mm = m_getclr(M_DONTWAIT, MT_HEADER); 1347 if (mm == NULL) { 1348 FREE(cb, M_PCB); 1349 error = ENOBUFS; 1350 goto spx_attach_end; 1351 } 1352 cb->s_ipx = mtod(mm, struct ipx *); 1353 cb->s_state = TCPS_LISTEN; 1354 cb->s_smax = -1; 1355 cb->s_swl1 = -1; 1356 cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q; 1357 cb->s_ipxpcb = ipxp; 1358 cb->s_mtu = 576 - sizeof(struct spx); 1359 cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu; 1360 cb->s_ssthresh = cb->s_cwnd; 1361 cb->s_cwmx = sbspace(sb) * CUNIT / (2 * sizeof(struct spx)); 1362 /* Above is recomputed when connecting to account 1363 for changed buffering or mtu's */ 1364 cb->s_rtt = SPXTV_SRTTBASE; 1365 cb->s_rttvar = SPXTV_SRTTDFLT << 2; 1366 SPXT_RANGESET(cb->s_rxtcur, 1367 ((SPXTV_SRTTBASE >> 2) + (SPXTV_SRTTDFLT << 2)) >> 1, 1368 SPXTV_MIN, SPXTV_REXMTMAX); 1369 ipxp->ipxp_pcb = (caddr_t)cb; 1370spx_attach_end: 1371 splx(s); 1372 return (error); 1373} 1374 1375static int 1376spx_bind(so, nam, td) 1377 struct socket *so; 1378 struct sockaddr *nam; 1379 struct thread *td; 1380{ 1381 struct ipxpcb *ipxp; 1382 1383 ipxp = sotoipxpcb(so); 1384 1385 return (ipx_pcbbind(ipxp, nam, td)); 1386} 1387 1388/* 1389 * Initiate connection to peer. 1390 * Enter SYN_SENT state, and mark socket as connecting. 1391 * Start keep-alive timer, setup prototype header, 1392 * Send initial system packet requesting connection. 1393 */ 1394static int 1395spx_connect(so, nam, td) 1396 struct socket *so; 1397 struct sockaddr *nam; 1398 struct thread *td; 1399{ 1400 int error; 1401 int s; 1402 struct ipxpcb *ipxp; 1403 struct spxpcb *cb; 1404 1405 ipxp = sotoipxpcb(so); 1406 cb = ipxtospxpcb(ipxp); 1407 1408 s = splnet(); 1409 if (ipxp->ipxp_lport == 0) { 1410 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td); 1411 if (error) 1412 goto spx_connect_end; 1413 } 1414 error = ipx_pcbconnect(ipxp, nam, td); 1415 if (error) 1416 goto spx_connect_end; 1417 soisconnecting(so); 1418 spxstat.spxs_connattempt++; 1419 cb->s_state = TCPS_SYN_SENT; 1420 cb->s_did = 0; 1421 spx_template(cb); 1422 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP; 1423 cb->s_force = 1 + SPXTV_KEEP; 1424 /* 1425 * Other party is required to respond to 1426 * the port I send from, but he is not 1427 * required to answer from where I am sending to, 1428 * so allow wildcarding. 1429 * original port I am sending to is still saved in 1430 * cb->s_dport. 1431 */ 1432 ipxp->ipxp_fport = 0; 1433 error = spx_output(cb, (struct mbuf *)NULL); 1434spx_connect_end: 1435 splx(s); 1436 return (error); 1437} 1438 1439static int 1440spx_detach(so) 1441 struct socket *so; 1442{ 1443 int s; 1444 struct ipxpcb *ipxp; 1445 struct spxpcb *cb; 1446 1447 ipxp = sotoipxpcb(so); 1448 cb = ipxtospxpcb(ipxp); 1449 1450 if (ipxp == NULL) 1451 return (ENOTCONN); 1452 s = splnet(); 1453 if (cb->s_state > TCPS_LISTEN) 1454 spx_disconnect(cb); 1455 else 1456 spx_close(cb); 1457 splx(s); 1458 return (0); 1459} 1460 1461/* 1462 * We may decide later to implement connection closing 1463 * handshaking at the spx level optionally. 1464 * here is the hook to do it: 1465 */ 1466static int 1467spx_usr_disconnect(so) 1468 struct socket *so; 1469{ 1470 int s; 1471 struct ipxpcb *ipxp; 1472 struct spxpcb *cb; 1473 1474 ipxp = sotoipxpcb(so); 1475 cb = ipxtospxpcb(ipxp); 1476 1477 s = splnet(); 1478 spx_disconnect(cb); 1479 splx(s); 1480 return (0); 1481} 1482 1483static int 1484spx_listen(so, td) 1485 struct socket *so; 1486 struct thread *td; 1487{ 1488 int error; 1489 struct ipxpcb *ipxp; 1490 struct spxpcb *cb; 1491 1492 error = 0; 1493 ipxp = sotoipxpcb(so); 1494 cb = ipxtospxpcb(ipxp); 1495 1496 if (ipxp->ipxp_lport == 0) 1497 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td); 1498 if (error == 0) 1499 cb->s_state = TCPS_LISTEN; 1500 return (error); 1501} 1502 1503/* 1504 * After a receive, possibly send acknowledgment 1505 * updating allocation. 1506 */ 1507static int 1508spx_rcvd(so, flags) 1509 struct socket *so; 1510 int flags; 1511{ 1512 int s; 1513 struct ipxpcb *ipxp; 1514 struct spxpcb *cb; 1515 1516 ipxp = sotoipxpcb(so); 1517 cb = ipxtospxpcb(ipxp); 1518 1519 s = splnet(); 1520 cb->s_flags |= SF_RVD; 1521 spx_output(cb, (struct mbuf *)NULL); 1522 cb->s_flags &= ~SF_RVD; 1523 splx(s); 1524 return (0); 1525} 1526 1527static int 1528spx_rcvoob(so, m, flags) 1529 struct socket *so; 1530 struct mbuf *m; 1531 int flags; 1532{ 1533 struct ipxpcb *ipxp; 1534 struct spxpcb *cb; 1535 1536 ipxp = sotoipxpcb(so); 1537 cb = ipxtospxpcb(ipxp); 1538 1539 if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark || 1540 (so->so_rcv.sb_state & SBS_RCVATMARK)) { 1541 m->m_len = 1; 1542 *mtod(m, caddr_t) = cb->s_iobc; 1543 return (0); 1544 } 1545 return (EINVAL); 1546} 1547 1548static int 1549spx_send(so, flags, m, addr, controlp, td) 1550 struct socket *so; 1551 int flags; 1552 struct mbuf *m; 1553 struct sockaddr *addr; 1554 struct mbuf *controlp; 1555 struct thread *td; 1556{ 1557 int error; 1558 int s; 1559 struct ipxpcb *ipxp; 1560 struct spxpcb *cb; 1561 1562 error = 0; 1563 ipxp = sotoipxpcb(so); 1564 cb = ipxtospxpcb(ipxp); 1565 1566 s = splnet(); 1567 if (flags & PRUS_OOB) { 1568 if (sbspace(&so->so_snd) < -512) { 1569 error = ENOBUFS; 1570 goto spx_send_end; 1571 } 1572 cb->s_oobflags |= SF_SOOB; 1573 } 1574 if (controlp != NULL) { 1575 u_short *p = mtod(controlp, u_short *); 1576 spx_newchecks[2]++; 1577 if ((p[0] == 5) && (p[1] == 1)) { /* XXXX, for testing */ 1578 cb->s_shdr.spx_dt = *(u_char *)(&p[2]); 1579 spx_newchecks[3]++; 1580 } 1581 m_freem(controlp); 1582 } 1583 controlp = NULL; 1584 error = spx_output(cb, m); 1585 m = NULL; 1586spx_send_end: 1587 if (controlp != NULL) 1588 m_freem(controlp); 1589 if (m != NULL) 1590 m_freem(m); 1591 splx(s); 1592 return (error); 1593} 1594 1595static int 1596spx_shutdown(so) 1597 struct socket *so; 1598{ 1599 int error; 1600 int s; 1601 struct ipxpcb *ipxp; 1602 struct spxpcb *cb; 1603 1604 error = 0; 1605 ipxp = sotoipxpcb(so); 1606 cb = ipxtospxpcb(ipxp); 1607 1608 s = splnet(); 1609 socantsendmore(so); 1610 cb = spx_usrclosed(cb); 1611 if (cb != NULL) 1612 error = spx_output(cb, (struct mbuf *)NULL); 1613 splx(s); 1614 return (error); 1615} 1616 1617static int 1618spx_sp_attach(so, proto, td) 1619 struct socket *so; 1620 int proto; 1621 struct thread *td; 1622{ 1623 int error; 1624 struct ipxpcb *ipxp; 1625 1626 error = spx_attach(so, proto, td); 1627 if (error == 0) { 1628 ipxp = sotoipxpcb(so); 1629 ((struct spxpcb *)ipxp->ipxp_pcb)->s_flags |= 1630 (SF_HI | SF_HO | SF_PI); 1631 } 1632 return (error); 1633} 1634 1635/* 1636 * Create template to be used to send spx packets on a connection. 1637 * Called after host entry created, fills 1638 * in a skeletal spx header (choosing connection id), 1639 * minimizing the amount of work necessary when the connection is used. 1640 */ 1641static void 1642spx_template(cb) 1643 register struct spxpcb *cb; 1644{ 1645 register struct ipxpcb *ipxp = cb->s_ipxpcb; 1646 register struct ipx *ipx = cb->s_ipx; 1647 register struct sockbuf *sb = &(ipxp->ipxp_socket->so_snd); 1648 1649 ipx->ipx_pt = IPXPROTO_SPX; 1650 ipx->ipx_sna = ipxp->ipxp_laddr; 1651 ipx->ipx_dna = ipxp->ipxp_faddr; 1652 cb->s_sid = htons(spx_iss); 1653 spx_iss += SPX_ISSINCR/2; 1654 cb->s_alo = 1; 1655 cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu; 1656 cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement 1657 of large packets */ 1658 cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spx)); 1659 cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd); 1660 /* But allow for lots of little packets as well */ 1661} 1662 1663/* 1664 * Close a SPIP control block: 1665 * discard spx control block itself 1666 * discard ipx protocol control block 1667 * wake up any sleepers 1668 */ 1669static struct spxpcb * 1670spx_close(cb) 1671 register struct spxpcb *cb; 1672{ 1673 register struct spx_q *s; 1674 struct ipxpcb *ipxp = cb->s_ipxpcb; 1675 struct socket *so = ipxp->ipxp_socket; 1676 register struct mbuf *m; 1677 1678 s = cb->s_q.si_next; 1679 while (s != &(cb->s_q)) { 1680 s = s->si_next; 1681 m = dtom(s->si_prev); 1682 remque(s->si_prev); 1683 m_freem(m); 1684 } 1685 m_free(dtom(cb->s_ipx)); 1686 FREE(cb, M_PCB); 1687 ipxp->ipxp_pcb = 0; 1688 soisdisconnected(so); 1689 ipx_pcbdetach(ipxp); 1690 spxstat.spxs_closed++; 1691 return ((struct spxpcb *)NULL); 1692} 1693 1694/* 1695 * Someday we may do level 3 handshaking 1696 * to close a connection or send a xerox style error. 1697 * For now, just close. 1698 */ 1699static struct spxpcb * 1700spx_usrclosed(cb) 1701 register struct spxpcb *cb; 1702{ 1703 return (spx_close(cb)); 1704} 1705 1706static struct spxpcb * 1707spx_disconnect(cb) 1708 register struct spxpcb *cb; 1709{ 1710 return (spx_close(cb)); 1711} 1712 1713/* 1714 * Drop connection, reporting 1715 * the specified error. 1716 */ 1717static struct spxpcb * 1718spx_drop(cb, errno) 1719 register struct spxpcb *cb; 1720 int errno; 1721{ 1722 struct socket *so = cb->s_ipxpcb->ipxp_socket; 1723 1724 /* 1725 * someday, in the xerox world 1726 * we will generate error protocol packets 1727 * announcing that the socket has gone away. 1728 */ 1729 if (TCPS_HAVERCVDSYN(cb->s_state)) { 1730 spxstat.spxs_drops++; 1731 cb->s_state = TCPS_CLOSED; 1732 /*tcp_output(cb);*/ 1733 } else 1734 spxstat.spxs_conndrops++; 1735 so->so_error = errno; 1736 return (spx_close(cb)); 1737} 1738 1739/* 1740 * Fast timeout routine for processing delayed acks 1741 */ 1742void 1743spx_fasttimo() 1744{ 1745 register struct ipxpcb *ipxp; 1746 register struct spxpcb *cb; 1747 int s = splnet(); 1748 1749 ipxp = ipxpcb.ipxp_next; 1750 if (ipxp != NULL) 1751 for (; ipxp != &ipxpcb; ipxp = ipxp->ipxp_next) 1752 if ((cb = (struct spxpcb *)ipxp->ipxp_pcb) != NULL && 1753 (cb->s_flags & SF_DELACK)) { 1754 cb->s_flags &= ~SF_DELACK; 1755 cb->s_flags |= SF_ACKNOW; 1756 spxstat.spxs_delack++; 1757 spx_output(cb, (struct mbuf *)NULL); 1758 } 1759 splx(s); 1760} 1761 1762/* 1763 * spx protocol timeout routine called every 500 ms. 1764 * Updates the timers in all active pcb's and 1765 * causes finite state machine actions if timers expire. 1766 */ 1767void 1768spx_slowtimo() 1769{ 1770 register struct ipxpcb *ip, *ipnxt; 1771 register struct spxpcb *cb; 1772 int s = splnet(); 1773 register int i; 1774 1775 /* 1776 * Search through tcb's and update active timers. 1777 */ 1778 ip = ipxpcb.ipxp_next; 1779 if (ip == NULL) { 1780 splx(s); 1781 return; 1782 } 1783 while (ip != &ipxpcb) { 1784 cb = ipxtospxpcb(ip); 1785 ipnxt = ip->ipxp_next; 1786 if (cb == NULL) 1787 goto tpgone; 1788 for (i = 0; i < SPXT_NTIMERS; i++) { 1789 if (cb->s_timer[i] && --cb->s_timer[i] == 0) { 1790 spx_timers(cb, i); 1791 if (ipnxt->ipxp_prev != ip) 1792 goto tpgone; 1793 } 1794 } 1795 cb->s_idle++; 1796 if (cb->s_rtt) 1797 cb->s_rtt++; 1798tpgone: 1799 ip = ipnxt; 1800 } 1801 spx_iss += SPX_ISSINCR/PR_SLOWHZ; /* increment iss */ 1802 splx(s); 1803} 1804 1805/* 1806 * SPX timer processing. 1807 */ 1808static struct spxpcb * 1809spx_timers(cb, timer) 1810 register struct spxpcb *cb; 1811 int timer; 1812{ 1813 long rexmt; 1814 int win; 1815 1816 cb->s_force = 1 + timer; 1817 switch (timer) { 1818 1819 /* 1820 * 2 MSL timeout in shutdown went off. TCP deletes connection 1821 * control block. 1822 */ 1823 case SPXT_2MSL: 1824 printf("spx: SPXT_2MSL went off for no reason\n"); 1825 cb->s_timer[timer] = 0; 1826 break; 1827 1828 /* 1829 * Retransmission timer went off. Message has not 1830 * been acked within retransmit interval. Back off 1831 * to a longer retransmit interval and retransmit one packet. 1832 */ 1833 case SPXT_REXMT: 1834 if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) { 1835 cb->s_rxtshift = SPX_MAXRXTSHIFT; 1836 spxstat.spxs_timeoutdrop++; 1837 cb = spx_drop(cb, ETIMEDOUT); 1838 break; 1839 } 1840 spxstat.spxs_rexmttimeo++; 1841 rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1; 1842 rexmt *= spx_backoff[cb->s_rxtshift]; 1843 SPXT_RANGESET(cb->s_rxtcur, rexmt, SPXTV_MIN, SPXTV_REXMTMAX); 1844 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur; 1845 /* 1846 * If we have backed off fairly far, our srtt 1847 * estimate is probably bogus. Clobber it 1848 * so we'll take the next rtt measurement as our srtt; 1849 * move the current srtt into rttvar to keep the current 1850 * retransmit times until then. 1851 */ 1852 if (cb->s_rxtshift > SPX_MAXRXTSHIFT / 4 ) { 1853 cb->s_rttvar += (cb->s_srtt >> 2); 1854 cb->s_srtt = 0; 1855 } 1856 cb->s_snxt = cb->s_rack; 1857 /* 1858 * If timing a packet, stop the timer. 1859 */ 1860 cb->s_rtt = 0; 1861 /* 1862 * See very long discussion in tcp_timer.c about congestion 1863 * window and sstrhesh 1864 */ 1865 win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2; 1866 if (win < 2) 1867 win = 2; 1868 cb->s_cwnd = CUNIT; 1869 cb->s_ssthresh = win * CUNIT; 1870 spx_output(cb, (struct mbuf *)NULL); 1871 break; 1872 1873 /* 1874 * Persistance timer into zero window. 1875 * Force a probe to be sent. 1876 */ 1877 case SPXT_PERSIST: 1878 spxstat.spxs_persisttimeo++; 1879 spx_setpersist(cb); 1880 spx_output(cb, (struct mbuf *)NULL); 1881 break; 1882 1883 /* 1884 * Keep-alive timer went off; send something 1885 * or drop connection if idle for too long. 1886 */ 1887 case SPXT_KEEP: 1888 spxstat.spxs_keeptimeo++; 1889 if (cb->s_state < TCPS_ESTABLISHED) 1890 goto dropit; 1891 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_KEEPALIVE) { 1892 if (cb->s_idle >= SPXTV_MAXIDLE) 1893 goto dropit; 1894 spxstat.spxs_keepprobe++; 1895 spx_output(cb, (struct mbuf *)NULL); 1896 } else 1897 cb->s_idle = 0; 1898 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP; 1899 break; 1900 dropit: 1901 spxstat.spxs_keepdrops++; 1902 cb = spx_drop(cb, ETIMEDOUT); 1903 break; 1904 } 1905 return (cb); 1906} 1907