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 126425 2004-03-01 03:14:23Z 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_state |= SS_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_state &= ~SS_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_state & SS_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}
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 126425 2004-03-01 03:14:23Z 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_state |= SS_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_state &= ~SS_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_state & SS_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}