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 139443 2004-12-30 17:21:07Z 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 const 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 .pru_abort = spx_usr_abort,
112 .pru_accept = spx_accept,
113 .pru_attach = spx_attach,
114 .pru_bind = spx_bind,
115 .pru_connect = spx_connect,
116 .pru_control = ipx_control,
117 .pru_detach = spx_detach,
118 .pru_disconnect = spx_usr_disconnect,
119 .pru_listen = spx_listen,
120 .pru_peeraddr = ipx_peeraddr,
121 .pru_rcvd = spx_rcvd,
122 .pru_rcvoob = spx_rcvoob,
123 .pru_send = spx_send,
124 .pru_shutdown = spx_shutdown,
125 .pru_sockaddr = ipx_sockaddr,
126};
127
128struct pr_usrreqs spx_usrreq_sps = {
129 .pru_abort = spx_usr_abort,
130 .pru_accept = spx_accept,
131 .pru_attach = spx_sp_attach,
132 .pru_bind = spx_bind,
133 .pru_connect = spx_connect,
134 .pru_control = ipx_control,
135 .pru_detach = spx_detach,
136 .pru_disconnect = spx_usr_disconnect,
137 .pru_listen = spx_listen,
138 .pru_peeraddr = ipx_peeraddr,
139 .pru_rcvd = spx_rcvd,
140 .pru_rcvoob = spx_rcvoob,
141 .pru_send = spx_send,
142 .pru_shutdown = spx_shutdown,
143 .pru_sockaddr = ipx_sockaddr,
144};
145
146void
147spx_init()
148{
149
150 spx_iss = 1; /* WRONG !! should fish it out of TODR */
151}
152
153void
154spx_input(m, ipxp)
155 register struct mbuf *m;
156 register struct ipxpcb *ipxp;
157{
158 register struct spxpcb *cb;
159 register struct spx *si = mtod(m, struct spx *);
160 register struct socket *so;
161 int dropsocket = 0;
162 short ostate = 0;
163
164 spxstat.spxs_rcvtotal++;
165 if (ipxp == NULL) {
166 panic("No ipxpcb in spx_input\n");
167 return;
168 }
169
170 cb = ipxtospxpcb(ipxp);
171 if (cb == NULL)
172 goto bad;
173
174 if (m->m_len < sizeof(*si)) {
175 if ((m = m_pullup(m, sizeof(*si))) == NULL) {
176 spxstat.spxs_rcvshort++;
177 return;
178 }
179 si = mtod(m, struct spx *);
180 }
181 si->si_seq = ntohs(si->si_seq);
182 si->si_ack = ntohs(si->si_ack);
183 si->si_alo = ntohs(si->si_alo);
184
185 so = ipxp->ipxp_socket;
186
187 if (so->so_options & SO_DEBUG || traceallspxs) {
188 ostate = cb->s_state;
189 spx_savesi = *si;
190 }
191 if (so->so_options & SO_ACCEPTCONN) {
192 struct spxpcb *ocb = cb;
193
194 so = sonewconn(so, 0);
195 if (so == NULL) {
196 goto drop;
197 }
198 /*
199 * This is ugly, but ....
200 *
201 * Mark socket as temporary until we're
202 * committed to keeping it. The code at
203 * ``drop'' and ``dropwithreset'' check the
204 * flag dropsocket to see if the temporary
205 * socket created here should be discarded.
206 * We mark the socket as discardable until
207 * we're committed to it below in TCPS_LISTEN.
208 */
209 dropsocket++;
210 ipxp = (struct ipxpcb *)so->so_pcb;
211 ipxp->ipxp_laddr = si->si_dna;
212 cb = ipxtospxpcb(ipxp);
213 cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
214 cb->s_flags = ocb->s_flags; /* preserve sockopts */
215 cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
216 cb->s_state = TCPS_LISTEN;
217 }
218
219 /*
220 * Packet received on connection.
221 * reset idle time and keep-alive timer;
222 */
223 cb->s_idle = 0;
224 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
225
226 switch (cb->s_state) {
227
228 case TCPS_LISTEN:{
229 struct sockaddr_ipx *sipx, ssipx;
230 struct ipx_addr laddr;
231
232 /*
233 * If somebody here was carying on a conversation
234 * and went away, and his pen pal thinks he can
235 * still talk, we get the misdirected packet.
236 */
237 if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
238 spx_istat.gonawy++;
239 goto dropwithreset;
240 }
241 sipx = &ssipx;
242 bzero(sipx, sizeof *sipx);
243 sipx->sipx_len = sizeof(*sipx);
244 sipx->sipx_family = AF_IPX;
245 sipx->sipx_addr = si->si_sna;
246 laddr = ipxp->ipxp_laddr;
247 if (ipx_nullhost(laddr))
248 ipxp->ipxp_laddr = si->si_dna;
249 if (ipx_pcbconnect(ipxp, (struct sockaddr *)sipx, &thread0)) {
250 ipxp->ipxp_laddr = laddr;
251 spx_istat.noconn++;
252 goto drop;
253 }
254 spx_template(cb);
255 dropsocket = 0; /* committed to socket */
256 cb->s_did = si->si_sid;
257 cb->s_rack = si->si_ack;
258 cb->s_ralo = si->si_alo;
259#define THREEWAYSHAKE
260#ifdef THREEWAYSHAKE
261 cb->s_state = TCPS_SYN_RECEIVED;
262 cb->s_force = 1 + SPXT_KEEP;
263 spxstat.spxs_accepts++;
264 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
265 }
266 break;
267 /*
268 * This state means that we have heard a response
269 * to our acceptance of their connection
270 * It is probably logically unnecessary in this
271 * implementation.
272 */
273 case TCPS_SYN_RECEIVED: {
274 if (si->si_did != cb->s_sid) {
275 spx_istat.wrncon++;
276 goto drop;
277 }
278#endif
279 ipxp->ipxp_fport = si->si_sport;
280 cb->s_timer[SPXT_REXMT] = 0;
281 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
282 soisconnected(so);
283 cb->s_state = TCPS_ESTABLISHED;
284 spxstat.spxs_accepts++;
285 }
286 break;
287
288 /*
289 * This state means that we have gotten a response
290 * to our attempt to establish a connection.
291 * We fill in the data from the other side,
292 * telling us which port to respond to, instead of the well-
293 * known one we might have sent to in the first place.
294 * We also require that this is a response to our
295 * connection id.
296 */
297 case TCPS_SYN_SENT:
298 if (si->si_did != cb->s_sid) {
299 spx_istat.notme++;
300 goto drop;
301 }
302 spxstat.spxs_connects++;
303 cb->s_did = si->si_sid;
304 cb->s_rack = si->si_ack;
305 cb->s_ralo = si->si_alo;
306 cb->s_dport = ipxp->ipxp_fport = si->si_sport;
307 cb->s_timer[SPXT_REXMT] = 0;
308 cb->s_flags |= SF_ACKNOW;
309 soisconnected(so);
310 cb->s_state = TCPS_ESTABLISHED;
311 /* Use roundtrip time of connection request for initial rtt */
312 if (cb->s_rtt) {
313 cb->s_srtt = cb->s_rtt << 3;
314 cb->s_rttvar = cb->s_rtt << 1;
315 SPXT_RANGESET(cb->s_rxtcur,
316 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
317 SPXTV_MIN, SPXTV_REXMTMAX);
318 cb->s_rtt = 0;
319 }
320 }
321 if (so->so_options & SO_DEBUG || traceallspxs)
322 spx_trace(SA_INPUT, (u_char)ostate, cb, &spx_savesi, 0);
323
324 m->m_len -= sizeof(struct ipx);
325 m->m_pkthdr.len -= sizeof(struct ipx);
326 m->m_data += sizeof(struct ipx);
327
328 if (spx_reass(cb, si)) {
329 m_freem(m);
330 }
331 if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
332 spx_output(cb, (struct mbuf *)NULL);
333 cb->s_flags &= ~(SF_WIN|SF_RXT);
334 return;
335
336dropwithreset:
337 if (dropsocket) {
338 struct socket *head;
339 ACCEPT_LOCK();
340 KASSERT((so->so_qstate & SQ_INCOMP) != 0,
341 ("spx_input: nascent socket not SQ_INCOMP on soabort()"));
342 head = so->so_head;
343 TAILQ_REMOVE(&head->so_incomp, so, so_list);
344 head->so_incqlen--;
345 so->so_qstate &= ~SQ_INCOMP;
346 so->so_head = NULL;
347 ACCEPT_UNLOCK();
348 soabort(so);
349 }
350 si->si_seq = ntohs(si->si_seq);
351 si->si_ack = ntohs(si->si_ack);
352 si->si_alo = ntohs(si->si_alo);
353 m_freem(dtom(si));
354 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs)
355 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
356 return;
357
358drop:
359bad:
360 if (cb == 0 || cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG ||
361 traceallspxs)
362 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
363 m_freem(m);
364}
365
366static int spxrexmtthresh = 3;
367
368/*
369 * This is structurally similar to the tcp reassembly routine
370 * but its function is somewhat different: It merely queues
371 * packets up, and suppresses duplicates.
372 */
373static int
374spx_reass(cb, si)
375register struct spxpcb *cb;
376register struct spx *si;
377{
378 register struct spx_q *q;
379 register struct mbuf *m;
380 register struct socket *so = cb->s_ipxpcb->ipxp_socket;
381 char packetp = cb->s_flags & SF_HI;
382 int incr;
383 char wakeup = 0;
384
385 if (si == SI(0))
386 goto present;
387 /*
388 * Update our news from them.
389 */
390 if (si->si_cc & SPX_SA)
391 cb->s_flags |= (spx_use_delack ? SF_DELACK : SF_ACKNOW);
392 if (SSEQ_GT(si->si_alo, cb->s_ralo))
393 cb->s_flags |= SF_WIN;
394 if (SSEQ_LEQ(si->si_ack, cb->s_rack)) {
395 if ((si->si_cc & SPX_SP) && cb->s_rack != (cb->s_smax + 1)) {
396 spxstat.spxs_rcvdupack++;
397 /*
398 * If this is a completely duplicate ack
399 * and other conditions hold, we assume
400 * a packet has been dropped and retransmit
401 * it exactly as in tcp_input().
402 */
403 if (si->si_ack != cb->s_rack ||
404 si->si_alo != cb->s_ralo)
405 cb->s_dupacks = 0;
406 else if (++cb->s_dupacks == spxrexmtthresh) {
407 u_short onxt = cb->s_snxt;
408 int cwnd = cb->s_cwnd;
409
410 cb->s_snxt = si->si_ack;
411 cb->s_cwnd = CUNIT;
412 cb->s_force = 1 + SPXT_REXMT;
413 spx_output(cb, (struct mbuf *)NULL);
414 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
415 cb->s_rtt = 0;
416 if (cwnd >= 4 * CUNIT)
417 cb->s_cwnd = cwnd / 2;
418 if (SSEQ_GT(onxt, cb->s_snxt))
419 cb->s_snxt = onxt;
420 return (1);
421 }
422 } else
423 cb->s_dupacks = 0;
424 goto update_window;
425 }
426 cb->s_dupacks = 0;
427 /*
428 * If our correspondent acknowledges data we haven't sent
429 * TCP would drop the packet after acking. We'll be a little
430 * more permissive
431 */
432 if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) {
433 spxstat.spxs_rcvacktoomuch++;
434 si->si_ack = cb->s_smax + 1;
435 }
436 spxstat.spxs_rcvackpack++;
437 /*
438 * If transmit timer is running and timed sequence
439 * number was acked, update smoothed round trip time.
440 * See discussion of algorithm in tcp_input.c
441 */
442 if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) {
443 spxstat.spxs_rttupdated++;
444 if (cb->s_srtt != 0) {
445 register short delta;
446 delta = cb->s_rtt - (cb->s_srtt >> 3);
447 if ((cb->s_srtt += delta) <= 0)
448 cb->s_srtt = 1;
449 if (delta < 0)
450 delta = -delta;
451 delta -= (cb->s_rttvar >> 2);
452 if ((cb->s_rttvar += delta) <= 0)
453 cb->s_rttvar = 1;
454 } else {
455 /*
456 * No rtt measurement yet
457 */
458 cb->s_srtt = cb->s_rtt << 3;
459 cb->s_rttvar = cb->s_rtt << 1;
460 }
461 cb->s_rtt = 0;
462 cb->s_rxtshift = 0;
463 SPXT_RANGESET(cb->s_rxtcur,
464 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
465 SPXTV_MIN, SPXTV_REXMTMAX);
466 }
467 /*
468 * If all outstanding data is acked, stop retransmit
469 * timer and remember to restart (more output or persist).
470 * If there is more data to be acked, restart retransmit
471 * timer, using current (possibly backed-off) value;
472 */
473 if (si->si_ack == cb->s_smax + 1) {
474 cb->s_timer[SPXT_REXMT] = 0;
475 cb->s_flags |= SF_RXT;
476 } else if (cb->s_timer[SPXT_PERSIST] == 0)
477 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
478 /*
479 * When new data is acked, open the congestion window.
480 * If the window gives us less than ssthresh packets
481 * in flight, open exponentially (maxseg at a time).
482 * Otherwise open linearly (maxseg^2 / cwnd at a time).
483 */
484 incr = CUNIT;
485 if (cb->s_cwnd > cb->s_ssthresh)
486 incr = max(incr * incr / cb->s_cwnd, 1);
487 cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx);
488 /*
489 * Trim Acked data from output queue.
490 */
491 while ((m = so->so_snd.sb_mb) != NULL) {
492 if (SSEQ_LT((mtod(m, struct spx *))->si_seq, si->si_ack))
493 sbdroprecord(&so->so_snd);
494 else
495 break;
496 }
497 sowwakeup(so);
498 cb->s_rack = si->si_ack;
499update_window:
500 if (SSEQ_LT(cb->s_snxt, cb->s_rack))
501 cb->s_snxt = cb->s_rack;
502 if (SSEQ_LT(cb->s_swl1, si->si_seq) || ((cb->s_swl1 == si->si_seq &&
503 (SSEQ_LT(cb->s_swl2, si->si_ack))) ||
504 (cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo)))) {
505 /* keep track of pure window updates */
506 if ((si->si_cc & SPX_SP) && cb->s_swl2 == si->si_ack
507 && SSEQ_LT(cb->s_ralo, si->si_alo)) {
508 spxstat.spxs_rcvwinupd++;
509 spxstat.spxs_rcvdupack--;
510 }
511 cb->s_ralo = si->si_alo;
512 cb->s_swl1 = si->si_seq;
513 cb->s_swl2 = si->si_ack;
514 cb->s_swnd = (1 + si->si_alo - si->si_ack);
515 if (cb->s_swnd > cb->s_smxw)
516 cb->s_smxw = cb->s_swnd;
517 cb->s_flags |= SF_WIN;
518 }
519 /*
520 * If this packet number is higher than that which
521 * we have allocated refuse it, unless urgent
522 */
523 if (SSEQ_GT(si->si_seq, cb->s_alo)) {
524 if (si->si_cc & SPX_SP) {
525 spxstat.spxs_rcvwinprobe++;
526 return (1);
527 } else
528 spxstat.spxs_rcvpackafterwin++;
529 if (si->si_cc & SPX_OB) {
530 if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
531 m_freem(dtom(si));
532 return (0);
533 } /* else queue this packet; */
534 } else {
535 /*register struct socket *so = cb->s_ipxpcb->ipxp_socket;
536 if (so->so_state && SS_NOFDREF) {
537 spx_close(cb);
538 } else
539 would crash system*/
540 spx_istat.notyet++;
541 m_freem(dtom(si));
542 return (0);
543 }
544 }
545 /*
546 * If this is a system packet, we don't need to
547 * queue it up, and won't update acknowledge #
548 */
549 if (si->si_cc & SPX_SP) {
550 return (1);
551 }
552 /*
553 * We have already seen this packet, so drop.
554 */
555 if (SSEQ_LT(si->si_seq, cb->s_ack)) {
556 spx_istat.bdreas++;
557 spxstat.spxs_rcvduppack++;
558 if (si->si_seq == cb->s_ack - 1)
559 spx_istat.lstdup++;
560 return (1);
561 }
562 /*
563 * Loop through all packets queued up to insert in
564 * appropriate sequence.
565 */
566 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
567 if (si->si_seq == SI(q)->si_seq) {
568 spxstat.spxs_rcvduppack++;
569 return (1);
570 }
571 if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) {
572 spxstat.spxs_rcvoopack++;
573 break;
574 }
575 }
576 insque(si, q->si_prev);
577 /*
578 * If this packet is urgent, inform process
579 */
580 if (si->si_cc & SPX_OB) {
581 cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
582 sohasoutofband(so);
583 cb->s_oobflags |= SF_IOOB;
584 }
585present:
586#define SPINC sizeof(struct spxhdr)
587 /*
588 * Loop through all packets queued up to update acknowledge
589 * number, and present all acknowledged data to user;
590 * If in packet interface mode, show packet headers.
591 */
592 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
593 if (SI(q)->si_seq == cb->s_ack) {
594 cb->s_ack++;
595 m = dtom(q);
596 if (SI(q)->si_cc & SPX_OB) {
597 cb->s_oobflags &= ~SF_IOOB;
598 SOCKBUF_LOCK(&so->so_rcv);
599 if (so->so_rcv.sb_cc)
600 so->so_oobmark = so->so_rcv.sb_cc;
601 else
602 so->so_rcv.sb_state |= SBS_RCVATMARK;
603 SOCKBUF_UNLOCK(&so->so_rcv);
604 }
605 q = q->si_prev;
606 remque(q->si_next);
607 wakeup = 1;
608 spxstat.spxs_rcvpack++;
609#ifdef SF_NEWCALL
610 if (cb->s_flags2 & SF_NEWCALL) {
611 struct spxhdr *sp = mtod(m, struct spxhdr *);
612 u_char dt = sp->spx_dt;
613 spx_newchecks[4]++;
614 if (dt != cb->s_rhdr.spx_dt) {
615 struct mbuf *mm =
616 m_getclr(M_DONTWAIT, MT_CONTROL);
617 spx_newchecks[0]++;
618 if (mm != NULL) {
619 u_short *s =
620 mtod(mm, u_short *);
621 cb->s_rhdr.spx_dt = dt;
622 mm->m_len = 5; /*XXX*/
623 s[0] = 5;
624 s[1] = 1;
625 *(u_char *)(&s[2]) = dt;
626 sbappend(&so->so_rcv, mm);
627 }
628 }
629 if (sp->spx_cc & SPX_OB) {
630 MCHTYPE(m, MT_OOBDATA);
631 spx_newchecks[1]++;
632 SOCKBUF_LOCK(&so->so_rcv);
633 so->so_oobmark = 0;
634 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
635 SOCKBUF_UNLOCK(&so->so_rcv);
636 }
637 if (packetp == 0) {
638 m->m_data += SPINC;
639 m->m_len -= SPINC;
640 m->m_pkthdr.len -= SPINC;
641 }
642 if ((sp->spx_cc & SPX_EM) || packetp) {
643 sbappendrecord(&so->so_rcv, m);
644 spx_newchecks[9]++;
645 } else
646 sbappend(&so->so_rcv, m);
647 } else
648#endif
649 if (packetp) {
650 sbappendrecord(&so->so_rcv, m);
651 } else {
652 cb->s_rhdr = *mtod(m, struct spxhdr *);
653 m->m_data += SPINC;
654 m->m_len -= SPINC;
655 m->m_pkthdr.len -= SPINC;
656 sbappend(&so->so_rcv, m);
657 }
658 } else
659 break;
660 }
661 if (wakeup)
662 sorwakeup(so);
663 return (0);
664}
665
666void
667spx_ctlinput(cmd, arg_as_sa, dummy)
668 int cmd;
669 struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
670 void *dummy;
671{
672 caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
673 struct ipx_addr *na;
674 struct sockaddr_ipx *sipx;
675
676 if (cmd < 0 || cmd >= PRC_NCMDS)
677 return;
678
679 switch (cmd) {
680
681 case PRC_ROUTEDEAD:
682 return;
683
684 case PRC_IFDOWN:
685 case PRC_HOSTDEAD:
686 case PRC_HOSTUNREACH:
687 sipx = (struct sockaddr_ipx *)arg;
688 if (sipx->sipx_family != AF_IPX)
689 return;
690 na = &sipx->sipx_addr;
691 break;
692
693 default:
694 break;
695 }
696}
697
698static int
699spx_output(cb, m0)
700 register struct spxpcb *cb;
701 struct mbuf *m0;
702{
703 struct socket *so = cb->s_ipxpcb->ipxp_socket;
704 register struct mbuf *m;
705 register struct spx *si = (struct spx *)NULL;
706 register struct sockbuf *sb = &so->so_snd;
707 int len = 0, win, rcv_win;
708 short span, off, recordp = 0;
709 u_short alo;
710 int error = 0, sendalot;
711#ifdef notdef
712 int idle;
713#endif
714 struct mbuf *mprev;
715
716 if (m0 != NULL) {
717 int mtu = cb->s_mtu;
718 int datalen;
719 /*
720 * Make sure that packet isn't too big.
721 */
722 for (m = m0; m != NULL; m = m->m_next) {
723 mprev = m;
724 len += m->m_len;
725 if (m->m_flags & M_EOR)
726 recordp = 1;
727 }
728 datalen = (cb->s_flags & SF_HO) ?
729 len - sizeof(struct spxhdr) : len;
730 if (datalen > mtu) {
731 if (cb->s_flags & SF_PI) {
732 m_freem(m0);
733 return (EMSGSIZE);
734 } else {
735 int oldEM = cb->s_cc & SPX_EM;
736
737 cb->s_cc &= ~SPX_EM;
738 while (len > mtu) {
739 /*
740 * Here we are only being called
741 * from usrreq(), so it is OK to
742 * block.
743 */
744 m = m_copym(m0, 0, mtu, M_TRYWAIT);
745 if (cb->s_flags & SF_NEWCALL) {
746 struct mbuf *mm = m;
747 spx_newchecks[7]++;
748 while (mm != NULL) {
749 mm->m_flags &= ~M_EOR;
750 mm = mm->m_next;
751 }
752 }
753 error = spx_output(cb, m);
754 if (error) {
755 cb->s_cc |= oldEM;
756 m_freem(m0);
757 return (error);
758 }
759 m_adj(m0, mtu);
760 len -= mtu;
761 }
762 cb->s_cc |= oldEM;
763 }
764 }
765 /*
766 * Force length even, by adding a "garbage byte" if
767 * necessary.
768 */
769 if (len & 1) {
770 m = mprev;
771 if (M_TRAILINGSPACE(m) >= 1)
772 m->m_len++;
773 else {
774 struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
775
776 if (m1 == NULL) {
777 m_freem(m0);
778 return (ENOBUFS);
779 }
780 m1->m_len = 1;
781 *(mtod(m1, u_char *)) = 0;
782 m->m_next = m1;
783 }
784 }
785 m = m_gethdr(M_DONTWAIT, MT_HEADER);
786 if (m == NULL) {
787 m_freem(m0);
788 return (ENOBUFS);
789 }
790 /*
791 * Fill in mbuf with extended SP header
792 * and addresses and length put into network format.
793 */
794 MH_ALIGN(m, sizeof(struct spx));
795 m->m_len = sizeof(struct spx);
796 m->m_next = m0;
797 si = mtod(m, struct spx *);
798 si->si_i = *cb->s_ipx;
799 si->si_s = cb->s_shdr;
800 if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
801 register struct spxhdr *sh;
802 if (m0->m_len < sizeof(*sh)) {
803 if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
804 m_free(m);
805 m_freem(m0);
806 return (EINVAL);
807 }
808 m->m_next = m0;
809 }
810 sh = mtod(m0, struct spxhdr *);
811 si->si_dt = sh->spx_dt;
812 si->si_cc |= sh->spx_cc & SPX_EM;
813 m0->m_len -= sizeof(*sh);
814 m0->m_data += sizeof(*sh);
815 len -= sizeof(*sh);
816 }
817 len += sizeof(*si);
818 if ((cb->s_flags2 & SF_NEWCALL) && recordp) {
819 si->si_cc |= SPX_EM;
820 spx_newchecks[8]++;
821 }
822 if (cb->s_oobflags & SF_SOOB) {
823 /*
824 * Per jqj@cornell:
825 * make sure OB packets convey exactly 1 byte.
826 * If the packet is 1 byte or larger, we
827 * have already guaranted there to be at least
828 * one garbage byte for the checksum, and
829 * extra bytes shouldn't hurt!
830 */
831 if (len > sizeof(*si)) {
832 si->si_cc |= SPX_OB;
833 len = (1 + sizeof(*si));
834 }
835 }
836 si->si_len = htons((u_short)len);
837 m->m_pkthdr.len = ((len - 1) | 1) + 1;
838 /*
839 * queue stuff up for output
840 */
841 sbappendrecord(sb, m);
842 cb->s_seq++;
843 }
844#ifdef notdef
845 idle = (cb->s_smax == (cb->s_rack - 1));
846#endif
847again:
848 sendalot = 0;
849 off = cb->s_snxt - cb->s_rack;
850 win = min(cb->s_swnd, (cb->s_cwnd / CUNIT));
851
852 /*
853 * If in persist timeout with window of 0, send a probe.
854 * Otherwise, if window is small but nonzero
855 * and timer expired, send what we can and go into
856 * transmit state.
857 */
858 if (cb->s_force == 1 + SPXT_PERSIST) {
859 if (win != 0) {
860 cb->s_timer[SPXT_PERSIST] = 0;
861 cb->s_rxtshift = 0;
862 }
863 }
864 span = cb->s_seq - cb->s_rack;
865 len = min(span, win) - off;
866
867 if (len < 0) {
868 /*
869 * Window shrank after we went into it.
870 * If window shrank to 0, cancel pending
871 * restransmission and pull s_snxt back
872 * to (closed) window. We will enter persist
873 * state below. If the widndow didn't close completely,
874 * just wait for an ACK.
875 */
876 len = 0;
877 if (win == 0) {
878 cb->s_timer[SPXT_REXMT] = 0;
879 cb->s_snxt = cb->s_rack;
880 }
881 }
882 if (len > 1)
883 sendalot = 1;
884 rcv_win = sbspace(&so->so_rcv);
885
886 /*
887 * Send if we owe peer an ACK.
888 */
889 if (cb->s_oobflags & SF_SOOB) {
890 /*
891 * must transmit this out of band packet
892 */
893 cb->s_oobflags &= ~ SF_SOOB;
894 sendalot = 1;
895 spxstat.spxs_sndurg++;
896 goto found;
897 }
898 if (cb->s_flags & SF_ACKNOW)
899 goto send;
900 if (cb->s_state < TCPS_ESTABLISHED)
901 goto send;
902 /*
903 * Silly window can't happen in spx.
904 * Code from tcp deleted.
905 */
906 if (len)
907 goto send;
908 /*
909 * Compare available window to amount of window
910 * known to peer (as advertised window less
911 * next expected input.) If the difference is at least two
912 * packets or at least 35% of the mximum possible window,
913 * then want to send a window update to peer.
914 */
915 if (rcv_win > 0) {
916 u_short delta = 1 + cb->s_alo - cb->s_ack;
917 int adv = rcv_win - (delta * cb->s_mtu);
918
919 if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) ||
920 (100 * adv / so->so_rcv.sb_hiwat >= 35)) {
921 spxstat.spxs_sndwinup++;
922 cb->s_flags |= SF_ACKNOW;
923 goto send;
924 }
925
926 }
927 /*
928 * Many comments from tcp_output.c are appropriate here
929 * including . . .
930 * If send window is too small, there is data to transmit, and no
931 * retransmit or persist is pending, then go to persist state.
932 * If nothing happens soon, send when timer expires:
933 * if window is nonzero, transmit what we can,
934 * otherwise send a probe.
935 */
936 if (so->so_snd.sb_cc && cb->s_timer[SPXT_REXMT] == 0 &&
937 cb->s_timer[SPXT_PERSIST] == 0) {
938 cb->s_rxtshift = 0;
939 spx_setpersist(cb);
940 }
941 /*
942 * No reason to send a packet, just return.
943 */
944 cb->s_outx = 1;
945 return (0);
946
947send:
948 /*
949 * Find requested packet.
950 */
951 si = 0;
952 if (len > 0) {
953 cb->s_want = cb->s_snxt;
954 for (m = sb->sb_mb; m != NULL; m = m->m_act) {
955 si = mtod(m, struct spx *);
956 if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
957 break;
958 }
959 found:
960 if (si != NULL) {
961 if (si->si_seq == cb->s_snxt)
962 cb->s_snxt++;
963 else
964 spxstat.spxs_sndvoid++, si = 0;
965 }
966 }
967 /*
968 * update window
969 */
970 if (rcv_win < 0)
971 rcv_win = 0;
972 alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu));
973 if (SSEQ_LT(alo, cb->s_alo))
974 alo = cb->s_alo;
975
976 if (si != NULL) {
977 /*
978 * must make a copy of this packet for
979 * ipx_output to monkey with
980 */
981 m = m_copy(dtom(si), 0, (int)M_COPYALL);
982 if (m == NULL) {
983 return (ENOBUFS);
984 }
985 si = mtod(m, struct spx *);
986 if (SSEQ_LT(si->si_seq, cb->s_smax))
987 spxstat.spxs_sndrexmitpack++;
988 else
989 spxstat.spxs_sndpack++;
990 } else if (cb->s_force || cb->s_flags & SF_ACKNOW) {
991 /*
992 * Must send an acknowledgement or a probe
993 */
994 if (cb->s_force)
995 spxstat.spxs_sndprobe++;
996 if (cb->s_flags & SF_ACKNOW)
997 spxstat.spxs_sndacks++;
998 m = m_gethdr(M_DONTWAIT, MT_HEADER);
999 if (m == NULL)
1000 return (ENOBUFS);
1001 /*
1002 * Fill in mbuf with extended SP header
1003 * and addresses and length put into network format.
1004 */
1005 MH_ALIGN(m, sizeof(struct spx));
1006 m->m_len = sizeof(*si);
1007 m->m_pkthdr.len = sizeof(*si);
1008 si = mtod(m, struct spx *);
1009 si->si_i = *cb->s_ipx;
1010 si->si_s = cb->s_shdr;
1011 si->si_seq = cb->s_smax + 1;
1012 si->si_len = htons(sizeof(*si));
1013 si->si_cc |= SPX_SP;
1014 } else {
1015 cb->s_outx = 3;
1016 if (so->so_options & SO_DEBUG || traceallspxs)
1017 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1018 return (0);
1019 }
1020 /*
1021 * Stuff checksum and output datagram.
1022 */
1023 if ((si->si_cc & SPX_SP) == 0) {
1024 if (cb->s_force != (1 + SPXT_PERSIST) ||
1025 cb->s_timer[SPXT_PERSIST] == 0) {
1026 /*
1027 * If this is a new packet and we are not currently
1028 * timing anything, time this one.
1029 */
1030 if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1031 cb->s_smax = si->si_seq;
1032 if (cb->s_rtt == 0) {
1033 spxstat.spxs_segstimed++;
1034 cb->s_rtseq = si->si_seq;
1035 cb->s_rtt = 1;
1036 }
1037 }
1038 /*
1039 * Set rexmt timer if not currently set,
1040 * Initial value for retransmit timer is smoothed
1041 * round-trip time + 2 * round-trip time variance.
1042 * Initialize shift counter which is used for backoff
1043 * of retransmit time.
1044 */
1045 if (cb->s_timer[SPXT_REXMT] == 0 &&
1046 cb->s_snxt != cb->s_rack) {
1047 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1048 if (cb->s_timer[SPXT_PERSIST]) {
1049 cb->s_timer[SPXT_PERSIST] = 0;
1050 cb->s_rxtshift = 0;
1051 }
1052 }
1053 } else if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1054 cb->s_smax = si->si_seq;
1055 }
1056 } else if (cb->s_state < TCPS_ESTABLISHED) {
1057 if (cb->s_rtt == 0)
1058 cb->s_rtt = 1; /* Time initial handshake */
1059 if (cb->s_timer[SPXT_REXMT] == 0)
1060 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1061 }
1062 {
1063 /*
1064 * Do not request acks when we ack their data packets or
1065 * when we do a gratuitous window update.
1066 */
1067 if (((si->si_cc & SPX_SP) == 0) || cb->s_force)
1068 si->si_cc |= SPX_SA;
1069 si->si_seq = htons(si->si_seq);
1070 si->si_alo = htons(alo);
1071 si->si_ack = htons(cb->s_ack);
1072
1073 if (ipxcksum) {
1074 si->si_sum = ipx_cksum(m, ntohs(si->si_len));
1075 } else
1076 si->si_sum = 0xffff;
1077
1078 cb->s_outx = 4;
1079 if (so->so_options & SO_DEBUG || traceallspxs)
1080 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1081
1082 if (so->so_options & SO_DONTROUTE)
1083 error = ipx_outputfl(m, (struct route *)NULL, IPX_ROUTETOIF);
1084 else
1085 error = ipx_outputfl(m, &cb->s_ipxpcb->ipxp_route, 0);
1086 }
1087 if (error) {
1088 return (error);
1089 }
1090 spxstat.spxs_sndtotal++;
1091 /*
1092 * Data sent (as far as we can tell).
1093 * If this advertises a larger window than any other segment,
1094 * then remember the size of the advertized window.
1095 * Any pending ACK has now been sent.
1096 */
1097 cb->s_force = 0;
1098 cb->s_flags &= ~(SF_ACKNOW|SF_DELACK);
1099 if (SSEQ_GT(alo, cb->s_alo))
1100 cb->s_alo = alo;
1101 if (sendalot)
1102 goto again;
1103 cb->s_outx = 5;
1104 return (0);
1105}
1106
1107static int spx_do_persist_panics = 0;
1108
1109static void
1110spx_setpersist(cb)
1111 register struct spxpcb *cb;
1112{
1113 register int t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1114
1115 if (cb->s_timer[SPXT_REXMT] && spx_do_persist_panics)
1116 panic("spx_output REXMT");
1117 /*
1118 * Start/restart persistance timer.
1119 */
1120 SPXT_RANGESET(cb->s_timer[SPXT_PERSIST],
1121 t*spx_backoff[cb->s_rxtshift],
1122 SPXTV_PERSMIN, SPXTV_PERSMAX);
1123 if (cb->s_rxtshift < SPX_MAXRXTSHIFT)
1124 cb->s_rxtshift++;
1125}
1126
1127int
1128spx_ctloutput(so, sopt)
1129 struct socket *so;
1130 struct sockopt *sopt;
1131{
1132 struct ipxpcb *ipxp = sotoipxpcb(so);
1133 register struct spxpcb *cb;
1134 int mask, error;
1135 short soptval;
1136 u_short usoptval;
1137 int optval;
1138
1139 error = 0;
1140
1141 if (sopt->sopt_level != IPXPROTO_SPX) {
1142 /* This will have to be changed when we do more general
1143 stacking of protocols */
1144 return (ipx_ctloutput(so, sopt));
1145 }
1146 if (ipxp == NULL)
1147 return (EINVAL);
1148 else
1149 cb = ipxtospxpcb(ipxp);
1150
1151 switch (sopt->sopt_dir) {
1152 case SOPT_GET:
1153 switch (sopt->sopt_name) {
1154 case SO_HEADERS_ON_INPUT:
1155 mask = SF_HI;
1156 goto get_flags;
1157
1158 case SO_HEADERS_ON_OUTPUT:
1159 mask = SF_HO;
1160 get_flags:
1161 soptval = cb->s_flags & mask;
1162 error = sooptcopyout(sopt, &soptval, sizeof soptval);
1163 break;
1164
1165 case SO_MTU:
1166 usoptval = cb->s_mtu;
1167 error = sooptcopyout(sopt, &usoptval, sizeof usoptval);
1168 break;
1169
1170 case SO_LAST_HEADER:
1171 error = sooptcopyout(sopt, &cb->s_rhdr,
1172 sizeof cb->s_rhdr);
1173 break;
1174
1175 case SO_DEFAULT_HEADERS:
1176 error = sooptcopyout(sopt, &cb->s_shdr,
1177 sizeof cb->s_shdr);
1178 break;
1179
1180 default:
1181 error = ENOPROTOOPT;
1182 }
1183 break;
1184
1185 case SOPT_SET:
1186 switch (sopt->sopt_name) {
1187 /* XXX why are these shorts on get and ints on set?
1188 that doesn't make any sense... */
1189 case SO_HEADERS_ON_INPUT:
1190 mask = SF_HI;
1191 goto set_head;
1192
1193 case SO_HEADERS_ON_OUTPUT:
1194 mask = SF_HO;
1195 set_head:
1196 error = sooptcopyin(sopt, &optval, sizeof optval,
1197 sizeof optval);
1198 if (error)
1199 break;
1200
1201 if (cb->s_flags & SF_PI) {
1202 if (optval)
1203 cb->s_flags |= mask;
1204 else
1205 cb->s_flags &= ~mask;
1206 } else error = EINVAL;
1207 break;
1208
1209 case SO_MTU:
1210 error = sooptcopyin(sopt, &usoptval, sizeof usoptval,
1211 sizeof usoptval);
1212 if (error)
1213 break;
1214 cb->s_mtu = usoptval;
1215 break;
1216
1217#ifdef SF_NEWCALL
1218 case SO_NEWCALL:
1219 error = sooptcopyin(sopt, &optval, sizeof optval,
1220 sizeof optval);
1221 if (error)
1222 break;
1223 if (optval) {
1224 cb->s_flags2 |= SF_NEWCALL;
1225 spx_newchecks[5]++;
1226 } else {
1227 cb->s_flags2 &= ~SF_NEWCALL;
1228 spx_newchecks[6]++;
1229 }
1230 break;
1231#endif
1232
1233 case SO_DEFAULT_HEADERS:
1234 {
1235 struct spxhdr sp;
1236
1237 error = sooptcopyin(sopt, &sp, sizeof sp,
1238 sizeof sp);
1239 if (error)
1240 break;
1241 cb->s_dt = sp.spx_dt;
1242 cb->s_cc = sp.spx_cc & SPX_EM;
1243 }
1244 break;
1245
1246 default:
1247 error = ENOPROTOOPT;
1248 }
1249 break;
1250 }
1251 return (error);
1252}
1253
1254static int
1255spx_usr_abort(so)
1256 struct socket *so;
1257{
1258 int s;
1259 struct ipxpcb *ipxp;
1260 struct spxpcb *cb;
1261
1262 ipxp = sotoipxpcb(so);
1263 cb = ipxtospxpcb(ipxp);
1264
1265 s = splnet();
1266 spx_drop(cb, ECONNABORTED);
1267 splx(s);
1268 return (0);
1269}
1270
1271/*
1272 * Accept a connection. Essentially all the work is
1273 * done at higher levels; just return the address
1274 * of the peer, storing through addr.
1275 */
1276static int
1277spx_accept(so, nam)
1278 struct socket *so;
1279 struct sockaddr **nam;
1280{
1281 struct ipxpcb *ipxp;
1282 struct sockaddr_ipx *sipx, ssipx;
1283
1284 ipxp = sotoipxpcb(so);
1285 sipx = &ssipx;
1286 bzero(sipx, sizeof *sipx);
1287 sipx->sipx_len = sizeof *sipx;
1288 sipx->sipx_family = AF_IPX;
1289 sipx->sipx_addr = ipxp->ipxp_faddr;
1290 *nam = sodupsockaddr((struct sockaddr *)sipx, M_NOWAIT);
1291 return (0);
1292}
1293
1294static int
1295spx_attach(so, proto, td)
1296 struct socket *so;
1297 int proto;
1298 struct thread *td;
1299{
1300 int error;
1301 int s;
1302 struct ipxpcb *ipxp;
1303 struct spxpcb *cb;
1304 struct mbuf *mm;
1305 struct sockbuf *sb;
1306
1307 ipxp = sotoipxpcb(so);
1308 cb = ipxtospxpcb(ipxp);
1309
1310 if (ipxp != NULL)
1311 return (EISCONN);
1312 s = splnet();
1313 error = ipx_pcballoc(so, &ipxpcb, td);
1314 if (error)
1315 goto spx_attach_end;
1316 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1317 error = soreserve(so, (u_long) 3072, (u_long) 3072);
1318 if (error)
1319 goto spx_attach_end;
1320 }
1321 ipxp = sotoipxpcb(so);
1322
1323 MALLOC(cb, struct spxpcb *, sizeof *cb, M_PCB, M_NOWAIT | M_ZERO);
1324
1325 if (cb == NULL) {
1326 error = ENOBUFS;
1327 goto spx_attach_end;
1328 }
1329 sb = &so->so_snd;
1330
1331 mm = m_getclr(M_DONTWAIT, MT_HEADER);
1332 if (mm == NULL) {
1333 FREE(cb, M_PCB);
1334 error = ENOBUFS;
1335 goto spx_attach_end;
1336 }
1337 cb->s_ipx = mtod(mm, struct ipx *);
1338 cb->s_state = TCPS_LISTEN;
1339 cb->s_smax = -1;
1340 cb->s_swl1 = -1;
1341 cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q;
1342 cb->s_ipxpcb = ipxp;
1343 cb->s_mtu = 576 - sizeof(struct spx);
1344 cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu;
1345 cb->s_ssthresh = cb->s_cwnd;
1346 cb->s_cwmx = sbspace(sb) * CUNIT / (2 * sizeof(struct spx));
1347 /* Above is recomputed when connecting to account
1348 for changed buffering or mtu's */
1349 cb->s_rtt = SPXTV_SRTTBASE;
1350 cb->s_rttvar = SPXTV_SRTTDFLT << 2;
1351 SPXT_RANGESET(cb->s_rxtcur,
1352 ((SPXTV_SRTTBASE >> 2) + (SPXTV_SRTTDFLT << 2)) >> 1,
1353 SPXTV_MIN, SPXTV_REXMTMAX);
1354 ipxp->ipxp_pcb = (caddr_t)cb;
1355spx_attach_end:
1356 splx(s);
1357 return (error);
1358}
1359
1360static int
1361spx_bind(so, nam, td)
1362 struct socket *so;
1363 struct sockaddr *nam;
1364 struct thread *td;
1365{
1366 struct ipxpcb *ipxp;
1367
1368 ipxp = sotoipxpcb(so);
1369
1370 return (ipx_pcbbind(ipxp, nam, td));
1371}
1372
1373/*
1374 * Initiate connection to peer.
1375 * Enter SYN_SENT state, and mark socket as connecting.
1376 * Start keep-alive timer, setup prototype header,
1377 * Send initial system packet requesting connection.
1378 */
1379static int
1380spx_connect(so, nam, td)
1381 struct socket *so;
1382 struct sockaddr *nam;
1383 struct thread *td;
1384{
1385 int error;
1386 int s;
1387 struct ipxpcb *ipxp;
1388 struct spxpcb *cb;
1389
1390 ipxp = sotoipxpcb(so);
1391 cb = ipxtospxpcb(ipxp);
1392
1393 s = splnet();
1394 if (ipxp->ipxp_lport == 0) {
1395 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
1396 if (error)
1397 goto spx_connect_end;
1398 }
1399 error = ipx_pcbconnect(ipxp, nam, td);
1400 if (error)
1401 goto spx_connect_end;
1402 soisconnecting(so);
1403 spxstat.spxs_connattempt++;
1404 cb->s_state = TCPS_SYN_SENT;
1405 cb->s_did = 0;
1406 spx_template(cb);
1407 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
1408 cb->s_force = 1 + SPXTV_KEEP;
1409 /*
1410 * Other party is required to respond to
1411 * the port I send from, but he is not
1412 * required to answer from where I am sending to,
1413 * so allow wildcarding.
1414 * original port I am sending to is still saved in
1415 * cb->s_dport.
1416 */
1417 ipxp->ipxp_fport = 0;
1418 error = spx_output(cb, (struct mbuf *)NULL);
1419spx_connect_end:
1420 splx(s);
1421 return (error);
1422}
1423
1424static int
1425spx_detach(so)
1426 struct socket *so;
1427{
1428 int s;
1429 struct ipxpcb *ipxp;
1430 struct spxpcb *cb;
1431
1432 ipxp = sotoipxpcb(so);
1433 cb = ipxtospxpcb(ipxp);
1434
1435 if (ipxp == NULL)
1436 return (ENOTCONN);
1437 s = splnet();
1438 if (cb->s_state > TCPS_LISTEN)
1439 spx_disconnect(cb);
1440 else
1441 spx_close(cb);
1442 splx(s);
1443 return (0);
1444}
1445
1446/*
1447 * We may decide later to implement connection closing
1448 * handshaking at the spx level optionally.
1449 * here is the hook to do it:
1450 */
1451static int
1452spx_usr_disconnect(so)
1453 struct socket *so;
1454{
1455 int s;
1456 struct ipxpcb *ipxp;
1457 struct spxpcb *cb;
1458
1459 ipxp = sotoipxpcb(so);
1460 cb = ipxtospxpcb(ipxp);
1461
1462 s = splnet();
1463 spx_disconnect(cb);
1464 splx(s);
1465 return (0);
1466}
1467
1468static int
1469spx_listen(so, td)
1470 struct socket *so;
1471 struct thread *td;
1472{
1473 int error;
1474 struct ipxpcb *ipxp;
1475 struct spxpcb *cb;
1476
1477 error = 0;
1478 ipxp = sotoipxpcb(so);
1479 cb = ipxtospxpcb(ipxp);
1480
1481 if (ipxp->ipxp_lport == 0)
1482 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
1483 if (error == 0)
1484 cb->s_state = TCPS_LISTEN;
1485 return (error);
1486}
1487
1488/*
1489 * After a receive, possibly send acknowledgment
1490 * updating allocation.
1491 */
1492static int
1493spx_rcvd(so, flags)
1494 struct socket *so;
1495 int flags;
1496{
1497 int s;
1498 struct ipxpcb *ipxp;
1499 struct spxpcb *cb;
1500
1501 ipxp = sotoipxpcb(so);
1502 cb = ipxtospxpcb(ipxp);
1503
1504 s = splnet();
1505 cb->s_flags |= SF_RVD;
1506 spx_output(cb, (struct mbuf *)NULL);
1507 cb->s_flags &= ~SF_RVD;
1508 splx(s);
1509 return (0);
1510}
1511
1512static int
1513spx_rcvoob(so, m, flags)
1514 struct socket *so;
1515 struct mbuf *m;
1516 int flags;
1517{
1518 struct ipxpcb *ipxp;
1519 struct spxpcb *cb;
1520
1521 ipxp = sotoipxpcb(so);
1522 cb = ipxtospxpcb(ipxp);
1523
1524 if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
1525 (so->so_rcv.sb_state & SBS_RCVATMARK)) {
1526 m->m_len = 1;
1527 *mtod(m, caddr_t) = cb->s_iobc;
1528 return (0);
1529 }
1530 return (EINVAL);
1531}
1532
1533static int
1534spx_send(so, flags, m, addr, controlp, td)
1535 struct socket *so;
1536 int flags;
1537 struct mbuf *m;
1538 struct sockaddr *addr;
1539 struct mbuf *controlp;
1540 struct thread *td;
1541{
1542 int error;
1543 int s;
1544 struct ipxpcb *ipxp;
1545 struct spxpcb *cb;
1546
1547 error = 0;
1548 ipxp = sotoipxpcb(so);
1549 cb = ipxtospxpcb(ipxp);
1550
1551 s = splnet();
1552 if (flags & PRUS_OOB) {
1553 if (sbspace(&so->so_snd) < -512) {
1554 error = ENOBUFS;
1555 goto spx_send_end;
1556 }
1557 cb->s_oobflags |= SF_SOOB;
1558 }
1559 if (controlp != NULL) {
1560 u_short *p = mtod(controlp, u_short *);
1561 spx_newchecks[2]++;
1562 if ((p[0] == 5) && (p[1] == 1)) { /* XXXX, for testing */
1563 cb->s_shdr.spx_dt = *(u_char *)(&p[2]);
1564 spx_newchecks[3]++;
1565 }
1566 m_freem(controlp);
1567 }
1568 controlp = NULL;
1569 error = spx_output(cb, m);
1570 m = NULL;
1571spx_send_end:
1572 if (controlp != NULL)
1573 m_freem(controlp);
1574 if (m != NULL)
1575 m_freem(m);
1576 splx(s);
1577 return (error);
1578}
1579
1580static int
1581spx_shutdown(so)
1582 struct socket *so;
1583{
1584 int error;
1585 int s;
1586 struct ipxpcb *ipxp;
1587 struct spxpcb *cb;
1588
1589 error = 0;
1590 ipxp = sotoipxpcb(so);
1591 cb = ipxtospxpcb(ipxp);
1592
1593 s = splnet();
1594 socantsendmore(so);
1595 cb = spx_usrclosed(cb);
1596 if (cb != NULL)
1597 error = spx_output(cb, (struct mbuf *)NULL);
1598 splx(s);
1599 return (error);
1600}
1601
1602static int
1603spx_sp_attach(so, proto, td)
1604 struct socket *so;
1605 int proto;
1606 struct thread *td;
1607{
1608 int error;
1609 struct ipxpcb *ipxp;
1610
1611 error = spx_attach(so, proto, td);
1612 if (error == 0) {
1613 ipxp = sotoipxpcb(so);
1614 ((struct spxpcb *)ipxp->ipxp_pcb)->s_flags |=
1615 (SF_HI | SF_HO | SF_PI);
1616 }
1617 return (error);
1618}
1619
1620/*
1621 * Create template to be used to send spx packets on a connection.
1622 * Called after host entry created, fills
1623 * in a skeletal spx header (choosing connection id),
1624 * minimizing the amount of work necessary when the connection is used.
1625 */
1626static void
1627spx_template(cb)
1628 register struct spxpcb *cb;
1629{
1630 register struct ipxpcb *ipxp = cb->s_ipxpcb;
1631 register struct ipx *ipx = cb->s_ipx;
1632 register struct sockbuf *sb = &(ipxp->ipxp_socket->so_snd);
1633
1634 ipx->ipx_pt = IPXPROTO_SPX;
1635 ipx->ipx_sna = ipxp->ipxp_laddr;
1636 ipx->ipx_dna = ipxp->ipxp_faddr;
1637 cb->s_sid = htons(spx_iss);
1638 spx_iss += SPX_ISSINCR/2;
1639 cb->s_alo = 1;
1640 cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu;
1641 cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement
1642 of large packets */
1643 cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spx));
1644 cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd);
1645 /* But allow for lots of little packets as well */
1646}
1647
1648/*
1649 * Close a SPIP control block:
1650 * discard spx control block itself
1651 * discard ipx protocol control block
1652 * wake up any sleepers
1653 */
1654static struct spxpcb *
1655spx_close(cb)
1656 register struct spxpcb *cb;
1657{
1658 register struct spx_q *s;
1659 struct ipxpcb *ipxp = cb->s_ipxpcb;
1660 struct socket *so = ipxp->ipxp_socket;
1661 register struct mbuf *m;
1662
1663 s = cb->s_q.si_next;
1664 while (s != &(cb->s_q)) {
1665 s = s->si_next;
1666 m = dtom(s->si_prev);
1667 remque(s->si_prev);
1668 m_freem(m);
1669 }
1670 m_free(dtom(cb->s_ipx));
1671 FREE(cb, M_PCB);
1672 ipxp->ipxp_pcb = 0;
1673 soisdisconnected(so);
1674 ipx_pcbdetach(ipxp);
1675 spxstat.spxs_closed++;
1676 return ((struct spxpcb *)NULL);
1677}
1678
1679/*
1680 * Someday we may do level 3 handshaking
1681 * to close a connection or send a xerox style error.
1682 * For now, just close.
1683 */
1684static struct spxpcb *
1685spx_usrclosed(cb)
1686 register struct spxpcb *cb;
1687{
1688 return (spx_close(cb));
1689}
1690
1691static struct spxpcb *
1692spx_disconnect(cb)
1693 register struct spxpcb *cb;
1694{
1695 return (spx_close(cb));
1696}
1697
1698/*
1699 * Drop connection, reporting
1700 * the specified error.
1701 */
1702static struct spxpcb *
1703spx_drop(cb, errno)
1704 register struct spxpcb *cb;
1705 int errno;
1706{
1707 struct socket *so = cb->s_ipxpcb->ipxp_socket;
1708
1709 /*
1710 * someday, in the xerox world
1711 * we will generate error protocol packets
1712 * announcing that the socket has gone away.
1713 */
1714 if (TCPS_HAVERCVDSYN(cb->s_state)) {
1715 spxstat.spxs_drops++;
1716 cb->s_state = TCPS_CLOSED;
1717 /*tcp_output(cb);*/
1718 } else
1719 spxstat.spxs_conndrops++;
1720 so->so_error = errno;
1721 return (spx_close(cb));
1722}
1723
1724/*
1725 * Fast timeout routine for processing delayed acks
1726 */
1727void
1728spx_fasttimo()
1729{
1730 register struct ipxpcb *ipxp;
1731 register struct spxpcb *cb;
1732 int s = splnet();
1733
1734 ipxp = ipxpcb.ipxp_next;
1735 if (ipxp != NULL)
1736 for (; ipxp != &ipxpcb; ipxp = ipxp->ipxp_next)
1737 if ((cb = (struct spxpcb *)ipxp->ipxp_pcb) != NULL &&
1738 (cb->s_flags & SF_DELACK)) {
1739 cb->s_flags &= ~SF_DELACK;
1740 cb->s_flags |= SF_ACKNOW;
1741 spxstat.spxs_delack++;
1742 spx_output(cb, (struct mbuf *)NULL);
1743 }
1744 splx(s);
1745}
1746
1747/*
1748 * spx protocol timeout routine called every 500 ms.
1749 * Updates the timers in all active pcb's and
1750 * causes finite state machine actions if timers expire.
1751 */
1752void
1753spx_slowtimo()
1754{
1755 register struct ipxpcb *ip, *ipnxt;
1756 register struct spxpcb *cb;
1757 int s = splnet();
1758 register int i;
1759
1760 /*
1761 * Search through tcb's and update active timers.
1762 */
1763 ip = ipxpcb.ipxp_next;
1764 if (ip == NULL) {
1765 splx(s);
1766 return;
1767 }
1768 while (ip != &ipxpcb) {
1769 cb = ipxtospxpcb(ip);
1770 ipnxt = ip->ipxp_next;
1771 if (cb == NULL)
1772 goto tpgone;
1773 for (i = 0; i < SPXT_NTIMERS; i++) {
1774 if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
1775 spx_timers(cb, i);
1776 if (ipnxt->ipxp_prev != ip)
1777 goto tpgone;
1778 }
1779 }
1780 cb->s_idle++;
1781 if (cb->s_rtt)
1782 cb->s_rtt++;
1783tpgone:
1784 ip = ipnxt;
1785 }
1786 spx_iss += SPX_ISSINCR/PR_SLOWHZ; /* increment iss */
1787 splx(s);
1788}
1789
1790/*
1791 * SPX timer processing.
1792 */
1793static struct spxpcb *
1794spx_timers(cb, timer)
1795 register struct spxpcb *cb;
1796 int timer;
1797{
1798 long rexmt;
1799 int win;
1800
1801 cb->s_force = 1 + timer;
1802 switch (timer) {
1803
1804 /*
1805 * 2 MSL timeout in shutdown went off. TCP deletes connection
1806 * control block.
1807 */
1808 case SPXT_2MSL:
1809 printf("spx: SPXT_2MSL went off for no reason\n");
1810 cb->s_timer[timer] = 0;
1811 break;
1812
1813 /*
1814 * Retransmission timer went off. Message has not
1815 * been acked within retransmit interval. Back off
1816 * to a longer retransmit interval and retransmit one packet.
1817 */
1818 case SPXT_REXMT:
1819 if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) {
1820 cb->s_rxtshift = SPX_MAXRXTSHIFT;
1821 spxstat.spxs_timeoutdrop++;
1822 cb = spx_drop(cb, ETIMEDOUT);
1823 break;
1824 }
1825 spxstat.spxs_rexmttimeo++;
1826 rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1827 rexmt *= spx_backoff[cb->s_rxtshift];
1828 SPXT_RANGESET(cb->s_rxtcur, rexmt, SPXTV_MIN, SPXTV_REXMTMAX);
1829 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1830 /*
1831 * If we have backed off fairly far, our srtt
1832 * estimate is probably bogus. Clobber it
1833 * so we'll take the next rtt measurement as our srtt;
1834 * move the current srtt into rttvar to keep the current
1835 * retransmit times until then.
1836 */
1837 if (cb->s_rxtshift > SPX_MAXRXTSHIFT / 4 ) {
1838 cb->s_rttvar += (cb->s_srtt >> 2);
1839 cb->s_srtt = 0;
1840 }
1841 cb->s_snxt = cb->s_rack;
1842 /*
1843 * If timing a packet, stop the timer.
1844 */
1845 cb->s_rtt = 0;
1846 /*
1847 * See very long discussion in tcp_timer.c about congestion
1848 * window and sstrhesh
1849 */
1850 win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2;
1851 if (win < 2)
1852 win = 2;
1853 cb->s_cwnd = CUNIT;
1854 cb->s_ssthresh = win * CUNIT;
1855 spx_output(cb, (struct mbuf *)NULL);
1856 break;
1857
1858 /*
1859 * Persistance timer into zero window.
1860 * Force a probe to be sent.
1861 */
1862 case SPXT_PERSIST:
1863 spxstat.spxs_persisttimeo++;
1864 spx_setpersist(cb);
1865 spx_output(cb, (struct mbuf *)NULL);
1866 break;
1867
1868 /*
1869 * Keep-alive timer went off; send something
1870 * or drop connection if idle for too long.
1871 */
1872 case SPXT_KEEP:
1873 spxstat.spxs_keeptimeo++;
1874 if (cb->s_state < TCPS_ESTABLISHED)
1875 goto dropit;
1876 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_KEEPALIVE) {
1877 if (cb->s_idle >= SPXTV_MAXIDLE)
1878 goto dropit;
1879 spxstat.spxs_keepprobe++;
1880 spx_output(cb, (struct mbuf *)NULL);
1881 } else
1882 cb->s_idle = 0;
1883 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
1884 break;
1885 dropit:
1886 spxstat.spxs_keepdrops++;
1887 cb = spx_drop(cb, ETIMEDOUT);
1888 break;
1889 }
1890 return (cb);
1891}
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 139443 2004-12-30 17:21:07Z 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 const 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 .pru_abort = spx_usr_abort,
112 .pru_accept = spx_accept,
113 .pru_attach = spx_attach,
114 .pru_bind = spx_bind,
115 .pru_connect = spx_connect,
116 .pru_control = ipx_control,
117 .pru_detach = spx_detach,
118 .pru_disconnect = spx_usr_disconnect,
119 .pru_listen = spx_listen,
120 .pru_peeraddr = ipx_peeraddr,
121 .pru_rcvd = spx_rcvd,
122 .pru_rcvoob = spx_rcvoob,
123 .pru_send = spx_send,
124 .pru_shutdown = spx_shutdown,
125 .pru_sockaddr = ipx_sockaddr,
126};
127
128struct pr_usrreqs spx_usrreq_sps = {
129 .pru_abort = spx_usr_abort,
130 .pru_accept = spx_accept,
131 .pru_attach = spx_sp_attach,
132 .pru_bind = spx_bind,
133 .pru_connect = spx_connect,
134 .pru_control = ipx_control,
135 .pru_detach = spx_detach,
136 .pru_disconnect = spx_usr_disconnect,
137 .pru_listen = spx_listen,
138 .pru_peeraddr = ipx_peeraddr,
139 .pru_rcvd = spx_rcvd,
140 .pru_rcvoob = spx_rcvoob,
141 .pru_send = spx_send,
142 .pru_shutdown = spx_shutdown,
143 .pru_sockaddr = ipx_sockaddr,
144};
145
146void
147spx_init()
148{
149
150 spx_iss = 1; /* WRONG !! should fish it out of TODR */
151}
152
153void
154spx_input(m, ipxp)
155 register struct mbuf *m;
156 register struct ipxpcb *ipxp;
157{
158 register struct spxpcb *cb;
159 register struct spx *si = mtod(m, struct spx *);
160 register struct socket *so;
161 int dropsocket = 0;
162 short ostate = 0;
163
164 spxstat.spxs_rcvtotal++;
165 if (ipxp == NULL) {
166 panic("No ipxpcb in spx_input\n");
167 return;
168 }
169
170 cb = ipxtospxpcb(ipxp);
171 if (cb == NULL)
172 goto bad;
173
174 if (m->m_len < sizeof(*si)) {
175 if ((m = m_pullup(m, sizeof(*si))) == NULL) {
176 spxstat.spxs_rcvshort++;
177 return;
178 }
179 si = mtod(m, struct spx *);
180 }
181 si->si_seq = ntohs(si->si_seq);
182 si->si_ack = ntohs(si->si_ack);
183 si->si_alo = ntohs(si->si_alo);
184
185 so = ipxp->ipxp_socket;
186
187 if (so->so_options & SO_DEBUG || traceallspxs) {
188 ostate = cb->s_state;
189 spx_savesi = *si;
190 }
191 if (so->so_options & SO_ACCEPTCONN) {
192 struct spxpcb *ocb = cb;
193
194 so = sonewconn(so, 0);
195 if (so == NULL) {
196 goto drop;
197 }
198 /*
199 * This is ugly, but ....
200 *
201 * Mark socket as temporary until we're
202 * committed to keeping it. The code at
203 * ``drop'' and ``dropwithreset'' check the
204 * flag dropsocket to see if the temporary
205 * socket created here should be discarded.
206 * We mark the socket as discardable until
207 * we're committed to it below in TCPS_LISTEN.
208 */
209 dropsocket++;
210 ipxp = (struct ipxpcb *)so->so_pcb;
211 ipxp->ipxp_laddr = si->si_dna;
212 cb = ipxtospxpcb(ipxp);
213 cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
214 cb->s_flags = ocb->s_flags; /* preserve sockopts */
215 cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
216 cb->s_state = TCPS_LISTEN;
217 }
218
219 /*
220 * Packet received on connection.
221 * reset idle time and keep-alive timer;
222 */
223 cb->s_idle = 0;
224 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
225
226 switch (cb->s_state) {
227
228 case TCPS_LISTEN:{
229 struct sockaddr_ipx *sipx, ssipx;
230 struct ipx_addr laddr;
231
232 /*
233 * If somebody here was carying on a conversation
234 * and went away, and his pen pal thinks he can
235 * still talk, we get the misdirected packet.
236 */
237 if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
238 spx_istat.gonawy++;
239 goto dropwithreset;
240 }
241 sipx = &ssipx;
242 bzero(sipx, sizeof *sipx);
243 sipx->sipx_len = sizeof(*sipx);
244 sipx->sipx_family = AF_IPX;
245 sipx->sipx_addr = si->si_sna;
246 laddr = ipxp->ipxp_laddr;
247 if (ipx_nullhost(laddr))
248 ipxp->ipxp_laddr = si->si_dna;
249 if (ipx_pcbconnect(ipxp, (struct sockaddr *)sipx, &thread0)) {
250 ipxp->ipxp_laddr = laddr;
251 spx_istat.noconn++;
252 goto drop;
253 }
254 spx_template(cb);
255 dropsocket = 0; /* committed to socket */
256 cb->s_did = si->si_sid;
257 cb->s_rack = si->si_ack;
258 cb->s_ralo = si->si_alo;
259#define THREEWAYSHAKE
260#ifdef THREEWAYSHAKE
261 cb->s_state = TCPS_SYN_RECEIVED;
262 cb->s_force = 1 + SPXT_KEEP;
263 spxstat.spxs_accepts++;
264 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
265 }
266 break;
267 /*
268 * This state means that we have heard a response
269 * to our acceptance of their connection
270 * It is probably logically unnecessary in this
271 * implementation.
272 */
273 case TCPS_SYN_RECEIVED: {
274 if (si->si_did != cb->s_sid) {
275 spx_istat.wrncon++;
276 goto drop;
277 }
278#endif
279 ipxp->ipxp_fport = si->si_sport;
280 cb->s_timer[SPXT_REXMT] = 0;
281 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
282 soisconnected(so);
283 cb->s_state = TCPS_ESTABLISHED;
284 spxstat.spxs_accepts++;
285 }
286 break;
287
288 /*
289 * This state means that we have gotten a response
290 * to our attempt to establish a connection.
291 * We fill in the data from the other side,
292 * telling us which port to respond to, instead of the well-
293 * known one we might have sent to in the first place.
294 * We also require that this is a response to our
295 * connection id.
296 */
297 case TCPS_SYN_SENT:
298 if (si->si_did != cb->s_sid) {
299 spx_istat.notme++;
300 goto drop;
301 }
302 spxstat.spxs_connects++;
303 cb->s_did = si->si_sid;
304 cb->s_rack = si->si_ack;
305 cb->s_ralo = si->si_alo;
306 cb->s_dport = ipxp->ipxp_fport = si->si_sport;
307 cb->s_timer[SPXT_REXMT] = 0;
308 cb->s_flags |= SF_ACKNOW;
309 soisconnected(so);
310 cb->s_state = TCPS_ESTABLISHED;
311 /* Use roundtrip time of connection request for initial rtt */
312 if (cb->s_rtt) {
313 cb->s_srtt = cb->s_rtt << 3;
314 cb->s_rttvar = cb->s_rtt << 1;
315 SPXT_RANGESET(cb->s_rxtcur,
316 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
317 SPXTV_MIN, SPXTV_REXMTMAX);
318 cb->s_rtt = 0;
319 }
320 }
321 if (so->so_options & SO_DEBUG || traceallspxs)
322 spx_trace(SA_INPUT, (u_char)ostate, cb, &spx_savesi, 0);
323
324 m->m_len -= sizeof(struct ipx);
325 m->m_pkthdr.len -= sizeof(struct ipx);
326 m->m_data += sizeof(struct ipx);
327
328 if (spx_reass(cb, si)) {
329 m_freem(m);
330 }
331 if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
332 spx_output(cb, (struct mbuf *)NULL);
333 cb->s_flags &= ~(SF_WIN|SF_RXT);
334 return;
335
336dropwithreset:
337 if (dropsocket) {
338 struct socket *head;
339 ACCEPT_LOCK();
340 KASSERT((so->so_qstate & SQ_INCOMP) != 0,
341 ("spx_input: nascent socket not SQ_INCOMP on soabort()"));
342 head = so->so_head;
343 TAILQ_REMOVE(&head->so_incomp, so, so_list);
344 head->so_incqlen--;
345 so->so_qstate &= ~SQ_INCOMP;
346 so->so_head = NULL;
347 ACCEPT_UNLOCK();
348 soabort(so);
349 }
350 si->si_seq = ntohs(si->si_seq);
351 si->si_ack = ntohs(si->si_ack);
352 si->si_alo = ntohs(si->si_alo);
353 m_freem(dtom(si));
354 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs)
355 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
356 return;
357
358drop:
359bad:
360 if (cb == 0 || cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG ||
361 traceallspxs)
362 spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
363 m_freem(m);
364}
365
366static int spxrexmtthresh = 3;
367
368/*
369 * This is structurally similar to the tcp reassembly routine
370 * but its function is somewhat different: It merely queues
371 * packets up, and suppresses duplicates.
372 */
373static int
374spx_reass(cb, si)
375register struct spxpcb *cb;
376register struct spx *si;
377{
378 register struct spx_q *q;
379 register struct mbuf *m;
380 register struct socket *so = cb->s_ipxpcb->ipxp_socket;
381 char packetp = cb->s_flags & SF_HI;
382 int incr;
383 char wakeup = 0;
384
385 if (si == SI(0))
386 goto present;
387 /*
388 * Update our news from them.
389 */
390 if (si->si_cc & SPX_SA)
391 cb->s_flags |= (spx_use_delack ? SF_DELACK : SF_ACKNOW);
392 if (SSEQ_GT(si->si_alo, cb->s_ralo))
393 cb->s_flags |= SF_WIN;
394 if (SSEQ_LEQ(si->si_ack, cb->s_rack)) {
395 if ((si->si_cc & SPX_SP) && cb->s_rack != (cb->s_smax + 1)) {
396 spxstat.spxs_rcvdupack++;
397 /*
398 * If this is a completely duplicate ack
399 * and other conditions hold, we assume
400 * a packet has been dropped and retransmit
401 * it exactly as in tcp_input().
402 */
403 if (si->si_ack != cb->s_rack ||
404 si->si_alo != cb->s_ralo)
405 cb->s_dupacks = 0;
406 else if (++cb->s_dupacks == spxrexmtthresh) {
407 u_short onxt = cb->s_snxt;
408 int cwnd = cb->s_cwnd;
409
410 cb->s_snxt = si->si_ack;
411 cb->s_cwnd = CUNIT;
412 cb->s_force = 1 + SPXT_REXMT;
413 spx_output(cb, (struct mbuf *)NULL);
414 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
415 cb->s_rtt = 0;
416 if (cwnd >= 4 * CUNIT)
417 cb->s_cwnd = cwnd / 2;
418 if (SSEQ_GT(onxt, cb->s_snxt))
419 cb->s_snxt = onxt;
420 return (1);
421 }
422 } else
423 cb->s_dupacks = 0;
424 goto update_window;
425 }
426 cb->s_dupacks = 0;
427 /*
428 * If our correspondent acknowledges data we haven't sent
429 * TCP would drop the packet after acking. We'll be a little
430 * more permissive
431 */
432 if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) {
433 spxstat.spxs_rcvacktoomuch++;
434 si->si_ack = cb->s_smax + 1;
435 }
436 spxstat.spxs_rcvackpack++;
437 /*
438 * If transmit timer is running and timed sequence
439 * number was acked, update smoothed round trip time.
440 * See discussion of algorithm in tcp_input.c
441 */
442 if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) {
443 spxstat.spxs_rttupdated++;
444 if (cb->s_srtt != 0) {
445 register short delta;
446 delta = cb->s_rtt - (cb->s_srtt >> 3);
447 if ((cb->s_srtt += delta) <= 0)
448 cb->s_srtt = 1;
449 if (delta < 0)
450 delta = -delta;
451 delta -= (cb->s_rttvar >> 2);
452 if ((cb->s_rttvar += delta) <= 0)
453 cb->s_rttvar = 1;
454 } else {
455 /*
456 * No rtt measurement yet
457 */
458 cb->s_srtt = cb->s_rtt << 3;
459 cb->s_rttvar = cb->s_rtt << 1;
460 }
461 cb->s_rtt = 0;
462 cb->s_rxtshift = 0;
463 SPXT_RANGESET(cb->s_rxtcur,
464 ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
465 SPXTV_MIN, SPXTV_REXMTMAX);
466 }
467 /*
468 * If all outstanding data is acked, stop retransmit
469 * timer and remember to restart (more output or persist).
470 * If there is more data to be acked, restart retransmit
471 * timer, using current (possibly backed-off) value;
472 */
473 if (si->si_ack == cb->s_smax + 1) {
474 cb->s_timer[SPXT_REXMT] = 0;
475 cb->s_flags |= SF_RXT;
476 } else if (cb->s_timer[SPXT_PERSIST] == 0)
477 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
478 /*
479 * When new data is acked, open the congestion window.
480 * If the window gives us less than ssthresh packets
481 * in flight, open exponentially (maxseg at a time).
482 * Otherwise open linearly (maxseg^2 / cwnd at a time).
483 */
484 incr = CUNIT;
485 if (cb->s_cwnd > cb->s_ssthresh)
486 incr = max(incr * incr / cb->s_cwnd, 1);
487 cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx);
488 /*
489 * Trim Acked data from output queue.
490 */
491 while ((m = so->so_snd.sb_mb) != NULL) {
492 if (SSEQ_LT((mtod(m, struct spx *))->si_seq, si->si_ack))
493 sbdroprecord(&so->so_snd);
494 else
495 break;
496 }
497 sowwakeup(so);
498 cb->s_rack = si->si_ack;
499update_window:
500 if (SSEQ_LT(cb->s_snxt, cb->s_rack))
501 cb->s_snxt = cb->s_rack;
502 if (SSEQ_LT(cb->s_swl1, si->si_seq) || ((cb->s_swl1 == si->si_seq &&
503 (SSEQ_LT(cb->s_swl2, si->si_ack))) ||
504 (cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo)))) {
505 /* keep track of pure window updates */
506 if ((si->si_cc & SPX_SP) && cb->s_swl2 == si->si_ack
507 && SSEQ_LT(cb->s_ralo, si->si_alo)) {
508 spxstat.spxs_rcvwinupd++;
509 spxstat.spxs_rcvdupack--;
510 }
511 cb->s_ralo = si->si_alo;
512 cb->s_swl1 = si->si_seq;
513 cb->s_swl2 = si->si_ack;
514 cb->s_swnd = (1 + si->si_alo - si->si_ack);
515 if (cb->s_swnd > cb->s_smxw)
516 cb->s_smxw = cb->s_swnd;
517 cb->s_flags |= SF_WIN;
518 }
519 /*
520 * If this packet number is higher than that which
521 * we have allocated refuse it, unless urgent
522 */
523 if (SSEQ_GT(si->si_seq, cb->s_alo)) {
524 if (si->si_cc & SPX_SP) {
525 spxstat.spxs_rcvwinprobe++;
526 return (1);
527 } else
528 spxstat.spxs_rcvpackafterwin++;
529 if (si->si_cc & SPX_OB) {
530 if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
531 m_freem(dtom(si));
532 return (0);
533 } /* else queue this packet; */
534 } else {
535 /*register struct socket *so = cb->s_ipxpcb->ipxp_socket;
536 if (so->so_state && SS_NOFDREF) {
537 spx_close(cb);
538 } else
539 would crash system*/
540 spx_istat.notyet++;
541 m_freem(dtom(si));
542 return (0);
543 }
544 }
545 /*
546 * If this is a system packet, we don't need to
547 * queue it up, and won't update acknowledge #
548 */
549 if (si->si_cc & SPX_SP) {
550 return (1);
551 }
552 /*
553 * We have already seen this packet, so drop.
554 */
555 if (SSEQ_LT(si->si_seq, cb->s_ack)) {
556 spx_istat.bdreas++;
557 spxstat.spxs_rcvduppack++;
558 if (si->si_seq == cb->s_ack - 1)
559 spx_istat.lstdup++;
560 return (1);
561 }
562 /*
563 * Loop through all packets queued up to insert in
564 * appropriate sequence.
565 */
566 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
567 if (si->si_seq == SI(q)->si_seq) {
568 spxstat.spxs_rcvduppack++;
569 return (1);
570 }
571 if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) {
572 spxstat.spxs_rcvoopack++;
573 break;
574 }
575 }
576 insque(si, q->si_prev);
577 /*
578 * If this packet is urgent, inform process
579 */
580 if (si->si_cc & SPX_OB) {
581 cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
582 sohasoutofband(so);
583 cb->s_oobflags |= SF_IOOB;
584 }
585present:
586#define SPINC sizeof(struct spxhdr)
587 /*
588 * Loop through all packets queued up to update acknowledge
589 * number, and present all acknowledged data to user;
590 * If in packet interface mode, show packet headers.
591 */
592 for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
593 if (SI(q)->si_seq == cb->s_ack) {
594 cb->s_ack++;
595 m = dtom(q);
596 if (SI(q)->si_cc & SPX_OB) {
597 cb->s_oobflags &= ~SF_IOOB;
598 SOCKBUF_LOCK(&so->so_rcv);
599 if (so->so_rcv.sb_cc)
600 so->so_oobmark = so->so_rcv.sb_cc;
601 else
602 so->so_rcv.sb_state |= SBS_RCVATMARK;
603 SOCKBUF_UNLOCK(&so->so_rcv);
604 }
605 q = q->si_prev;
606 remque(q->si_next);
607 wakeup = 1;
608 spxstat.spxs_rcvpack++;
609#ifdef SF_NEWCALL
610 if (cb->s_flags2 & SF_NEWCALL) {
611 struct spxhdr *sp = mtod(m, struct spxhdr *);
612 u_char dt = sp->spx_dt;
613 spx_newchecks[4]++;
614 if (dt != cb->s_rhdr.spx_dt) {
615 struct mbuf *mm =
616 m_getclr(M_DONTWAIT, MT_CONTROL);
617 spx_newchecks[0]++;
618 if (mm != NULL) {
619 u_short *s =
620 mtod(mm, u_short *);
621 cb->s_rhdr.spx_dt = dt;
622 mm->m_len = 5; /*XXX*/
623 s[0] = 5;
624 s[1] = 1;
625 *(u_char *)(&s[2]) = dt;
626 sbappend(&so->so_rcv, mm);
627 }
628 }
629 if (sp->spx_cc & SPX_OB) {
630 MCHTYPE(m, MT_OOBDATA);
631 spx_newchecks[1]++;
632 SOCKBUF_LOCK(&so->so_rcv);
633 so->so_oobmark = 0;
634 so->so_rcv.sb_state &= ~SBS_RCVATMARK;
635 SOCKBUF_UNLOCK(&so->so_rcv);
636 }
637 if (packetp == 0) {
638 m->m_data += SPINC;
639 m->m_len -= SPINC;
640 m->m_pkthdr.len -= SPINC;
641 }
642 if ((sp->spx_cc & SPX_EM) || packetp) {
643 sbappendrecord(&so->so_rcv, m);
644 spx_newchecks[9]++;
645 } else
646 sbappend(&so->so_rcv, m);
647 } else
648#endif
649 if (packetp) {
650 sbappendrecord(&so->so_rcv, m);
651 } else {
652 cb->s_rhdr = *mtod(m, struct spxhdr *);
653 m->m_data += SPINC;
654 m->m_len -= SPINC;
655 m->m_pkthdr.len -= SPINC;
656 sbappend(&so->so_rcv, m);
657 }
658 } else
659 break;
660 }
661 if (wakeup)
662 sorwakeup(so);
663 return (0);
664}
665
666void
667spx_ctlinput(cmd, arg_as_sa, dummy)
668 int cmd;
669 struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
670 void *dummy;
671{
672 caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
673 struct ipx_addr *na;
674 struct sockaddr_ipx *sipx;
675
676 if (cmd < 0 || cmd >= PRC_NCMDS)
677 return;
678
679 switch (cmd) {
680
681 case PRC_ROUTEDEAD:
682 return;
683
684 case PRC_IFDOWN:
685 case PRC_HOSTDEAD:
686 case PRC_HOSTUNREACH:
687 sipx = (struct sockaddr_ipx *)arg;
688 if (sipx->sipx_family != AF_IPX)
689 return;
690 na = &sipx->sipx_addr;
691 break;
692
693 default:
694 break;
695 }
696}
697
698static int
699spx_output(cb, m0)
700 register struct spxpcb *cb;
701 struct mbuf *m0;
702{
703 struct socket *so = cb->s_ipxpcb->ipxp_socket;
704 register struct mbuf *m;
705 register struct spx *si = (struct spx *)NULL;
706 register struct sockbuf *sb = &so->so_snd;
707 int len = 0, win, rcv_win;
708 short span, off, recordp = 0;
709 u_short alo;
710 int error = 0, sendalot;
711#ifdef notdef
712 int idle;
713#endif
714 struct mbuf *mprev;
715
716 if (m0 != NULL) {
717 int mtu = cb->s_mtu;
718 int datalen;
719 /*
720 * Make sure that packet isn't too big.
721 */
722 for (m = m0; m != NULL; m = m->m_next) {
723 mprev = m;
724 len += m->m_len;
725 if (m->m_flags & M_EOR)
726 recordp = 1;
727 }
728 datalen = (cb->s_flags & SF_HO) ?
729 len - sizeof(struct spxhdr) : len;
730 if (datalen > mtu) {
731 if (cb->s_flags & SF_PI) {
732 m_freem(m0);
733 return (EMSGSIZE);
734 } else {
735 int oldEM = cb->s_cc & SPX_EM;
736
737 cb->s_cc &= ~SPX_EM;
738 while (len > mtu) {
739 /*
740 * Here we are only being called
741 * from usrreq(), so it is OK to
742 * block.
743 */
744 m = m_copym(m0, 0, mtu, M_TRYWAIT);
745 if (cb->s_flags & SF_NEWCALL) {
746 struct mbuf *mm = m;
747 spx_newchecks[7]++;
748 while (mm != NULL) {
749 mm->m_flags &= ~M_EOR;
750 mm = mm->m_next;
751 }
752 }
753 error = spx_output(cb, m);
754 if (error) {
755 cb->s_cc |= oldEM;
756 m_freem(m0);
757 return (error);
758 }
759 m_adj(m0, mtu);
760 len -= mtu;
761 }
762 cb->s_cc |= oldEM;
763 }
764 }
765 /*
766 * Force length even, by adding a "garbage byte" if
767 * necessary.
768 */
769 if (len & 1) {
770 m = mprev;
771 if (M_TRAILINGSPACE(m) >= 1)
772 m->m_len++;
773 else {
774 struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
775
776 if (m1 == NULL) {
777 m_freem(m0);
778 return (ENOBUFS);
779 }
780 m1->m_len = 1;
781 *(mtod(m1, u_char *)) = 0;
782 m->m_next = m1;
783 }
784 }
785 m = m_gethdr(M_DONTWAIT, MT_HEADER);
786 if (m == NULL) {
787 m_freem(m0);
788 return (ENOBUFS);
789 }
790 /*
791 * Fill in mbuf with extended SP header
792 * and addresses and length put into network format.
793 */
794 MH_ALIGN(m, sizeof(struct spx));
795 m->m_len = sizeof(struct spx);
796 m->m_next = m0;
797 si = mtod(m, struct spx *);
798 si->si_i = *cb->s_ipx;
799 si->si_s = cb->s_shdr;
800 if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
801 register struct spxhdr *sh;
802 if (m0->m_len < sizeof(*sh)) {
803 if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
804 m_free(m);
805 m_freem(m0);
806 return (EINVAL);
807 }
808 m->m_next = m0;
809 }
810 sh = mtod(m0, struct spxhdr *);
811 si->si_dt = sh->spx_dt;
812 si->si_cc |= sh->spx_cc & SPX_EM;
813 m0->m_len -= sizeof(*sh);
814 m0->m_data += sizeof(*sh);
815 len -= sizeof(*sh);
816 }
817 len += sizeof(*si);
818 if ((cb->s_flags2 & SF_NEWCALL) && recordp) {
819 si->si_cc |= SPX_EM;
820 spx_newchecks[8]++;
821 }
822 if (cb->s_oobflags & SF_SOOB) {
823 /*
824 * Per jqj@cornell:
825 * make sure OB packets convey exactly 1 byte.
826 * If the packet is 1 byte or larger, we
827 * have already guaranted there to be at least
828 * one garbage byte for the checksum, and
829 * extra bytes shouldn't hurt!
830 */
831 if (len > sizeof(*si)) {
832 si->si_cc |= SPX_OB;
833 len = (1 + sizeof(*si));
834 }
835 }
836 si->si_len = htons((u_short)len);
837 m->m_pkthdr.len = ((len - 1) | 1) + 1;
838 /*
839 * queue stuff up for output
840 */
841 sbappendrecord(sb, m);
842 cb->s_seq++;
843 }
844#ifdef notdef
845 idle = (cb->s_smax == (cb->s_rack - 1));
846#endif
847again:
848 sendalot = 0;
849 off = cb->s_snxt - cb->s_rack;
850 win = min(cb->s_swnd, (cb->s_cwnd / CUNIT));
851
852 /*
853 * If in persist timeout with window of 0, send a probe.
854 * Otherwise, if window is small but nonzero
855 * and timer expired, send what we can and go into
856 * transmit state.
857 */
858 if (cb->s_force == 1 + SPXT_PERSIST) {
859 if (win != 0) {
860 cb->s_timer[SPXT_PERSIST] = 0;
861 cb->s_rxtshift = 0;
862 }
863 }
864 span = cb->s_seq - cb->s_rack;
865 len = min(span, win) - off;
866
867 if (len < 0) {
868 /*
869 * Window shrank after we went into it.
870 * If window shrank to 0, cancel pending
871 * restransmission and pull s_snxt back
872 * to (closed) window. We will enter persist
873 * state below. If the widndow didn't close completely,
874 * just wait for an ACK.
875 */
876 len = 0;
877 if (win == 0) {
878 cb->s_timer[SPXT_REXMT] = 0;
879 cb->s_snxt = cb->s_rack;
880 }
881 }
882 if (len > 1)
883 sendalot = 1;
884 rcv_win = sbspace(&so->so_rcv);
885
886 /*
887 * Send if we owe peer an ACK.
888 */
889 if (cb->s_oobflags & SF_SOOB) {
890 /*
891 * must transmit this out of band packet
892 */
893 cb->s_oobflags &= ~ SF_SOOB;
894 sendalot = 1;
895 spxstat.spxs_sndurg++;
896 goto found;
897 }
898 if (cb->s_flags & SF_ACKNOW)
899 goto send;
900 if (cb->s_state < TCPS_ESTABLISHED)
901 goto send;
902 /*
903 * Silly window can't happen in spx.
904 * Code from tcp deleted.
905 */
906 if (len)
907 goto send;
908 /*
909 * Compare available window to amount of window
910 * known to peer (as advertised window less
911 * next expected input.) If the difference is at least two
912 * packets or at least 35% of the mximum possible window,
913 * then want to send a window update to peer.
914 */
915 if (rcv_win > 0) {
916 u_short delta = 1 + cb->s_alo - cb->s_ack;
917 int adv = rcv_win - (delta * cb->s_mtu);
918
919 if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) ||
920 (100 * adv / so->so_rcv.sb_hiwat >= 35)) {
921 spxstat.spxs_sndwinup++;
922 cb->s_flags |= SF_ACKNOW;
923 goto send;
924 }
925
926 }
927 /*
928 * Many comments from tcp_output.c are appropriate here
929 * including . . .
930 * If send window is too small, there is data to transmit, and no
931 * retransmit or persist is pending, then go to persist state.
932 * If nothing happens soon, send when timer expires:
933 * if window is nonzero, transmit what we can,
934 * otherwise send a probe.
935 */
936 if (so->so_snd.sb_cc && cb->s_timer[SPXT_REXMT] == 0 &&
937 cb->s_timer[SPXT_PERSIST] == 0) {
938 cb->s_rxtshift = 0;
939 spx_setpersist(cb);
940 }
941 /*
942 * No reason to send a packet, just return.
943 */
944 cb->s_outx = 1;
945 return (0);
946
947send:
948 /*
949 * Find requested packet.
950 */
951 si = 0;
952 if (len > 0) {
953 cb->s_want = cb->s_snxt;
954 for (m = sb->sb_mb; m != NULL; m = m->m_act) {
955 si = mtod(m, struct spx *);
956 if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
957 break;
958 }
959 found:
960 if (si != NULL) {
961 if (si->si_seq == cb->s_snxt)
962 cb->s_snxt++;
963 else
964 spxstat.spxs_sndvoid++, si = 0;
965 }
966 }
967 /*
968 * update window
969 */
970 if (rcv_win < 0)
971 rcv_win = 0;
972 alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu));
973 if (SSEQ_LT(alo, cb->s_alo))
974 alo = cb->s_alo;
975
976 if (si != NULL) {
977 /*
978 * must make a copy of this packet for
979 * ipx_output to monkey with
980 */
981 m = m_copy(dtom(si), 0, (int)M_COPYALL);
982 if (m == NULL) {
983 return (ENOBUFS);
984 }
985 si = mtod(m, struct spx *);
986 if (SSEQ_LT(si->si_seq, cb->s_smax))
987 spxstat.spxs_sndrexmitpack++;
988 else
989 spxstat.spxs_sndpack++;
990 } else if (cb->s_force || cb->s_flags & SF_ACKNOW) {
991 /*
992 * Must send an acknowledgement or a probe
993 */
994 if (cb->s_force)
995 spxstat.spxs_sndprobe++;
996 if (cb->s_flags & SF_ACKNOW)
997 spxstat.spxs_sndacks++;
998 m = m_gethdr(M_DONTWAIT, MT_HEADER);
999 if (m == NULL)
1000 return (ENOBUFS);
1001 /*
1002 * Fill in mbuf with extended SP header
1003 * and addresses and length put into network format.
1004 */
1005 MH_ALIGN(m, sizeof(struct spx));
1006 m->m_len = sizeof(*si);
1007 m->m_pkthdr.len = sizeof(*si);
1008 si = mtod(m, struct spx *);
1009 si->si_i = *cb->s_ipx;
1010 si->si_s = cb->s_shdr;
1011 si->si_seq = cb->s_smax + 1;
1012 si->si_len = htons(sizeof(*si));
1013 si->si_cc |= SPX_SP;
1014 } else {
1015 cb->s_outx = 3;
1016 if (so->so_options & SO_DEBUG || traceallspxs)
1017 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1018 return (0);
1019 }
1020 /*
1021 * Stuff checksum and output datagram.
1022 */
1023 if ((si->si_cc & SPX_SP) == 0) {
1024 if (cb->s_force != (1 + SPXT_PERSIST) ||
1025 cb->s_timer[SPXT_PERSIST] == 0) {
1026 /*
1027 * If this is a new packet and we are not currently
1028 * timing anything, time this one.
1029 */
1030 if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1031 cb->s_smax = si->si_seq;
1032 if (cb->s_rtt == 0) {
1033 spxstat.spxs_segstimed++;
1034 cb->s_rtseq = si->si_seq;
1035 cb->s_rtt = 1;
1036 }
1037 }
1038 /*
1039 * Set rexmt timer if not currently set,
1040 * Initial value for retransmit timer is smoothed
1041 * round-trip time + 2 * round-trip time variance.
1042 * Initialize shift counter which is used for backoff
1043 * of retransmit time.
1044 */
1045 if (cb->s_timer[SPXT_REXMT] == 0 &&
1046 cb->s_snxt != cb->s_rack) {
1047 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1048 if (cb->s_timer[SPXT_PERSIST]) {
1049 cb->s_timer[SPXT_PERSIST] = 0;
1050 cb->s_rxtshift = 0;
1051 }
1052 }
1053 } else if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1054 cb->s_smax = si->si_seq;
1055 }
1056 } else if (cb->s_state < TCPS_ESTABLISHED) {
1057 if (cb->s_rtt == 0)
1058 cb->s_rtt = 1; /* Time initial handshake */
1059 if (cb->s_timer[SPXT_REXMT] == 0)
1060 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1061 }
1062 {
1063 /*
1064 * Do not request acks when we ack their data packets or
1065 * when we do a gratuitous window update.
1066 */
1067 if (((si->si_cc & SPX_SP) == 0) || cb->s_force)
1068 si->si_cc |= SPX_SA;
1069 si->si_seq = htons(si->si_seq);
1070 si->si_alo = htons(alo);
1071 si->si_ack = htons(cb->s_ack);
1072
1073 if (ipxcksum) {
1074 si->si_sum = ipx_cksum(m, ntohs(si->si_len));
1075 } else
1076 si->si_sum = 0xffff;
1077
1078 cb->s_outx = 4;
1079 if (so->so_options & SO_DEBUG || traceallspxs)
1080 spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1081
1082 if (so->so_options & SO_DONTROUTE)
1083 error = ipx_outputfl(m, (struct route *)NULL, IPX_ROUTETOIF);
1084 else
1085 error = ipx_outputfl(m, &cb->s_ipxpcb->ipxp_route, 0);
1086 }
1087 if (error) {
1088 return (error);
1089 }
1090 spxstat.spxs_sndtotal++;
1091 /*
1092 * Data sent (as far as we can tell).
1093 * If this advertises a larger window than any other segment,
1094 * then remember the size of the advertized window.
1095 * Any pending ACK has now been sent.
1096 */
1097 cb->s_force = 0;
1098 cb->s_flags &= ~(SF_ACKNOW|SF_DELACK);
1099 if (SSEQ_GT(alo, cb->s_alo))
1100 cb->s_alo = alo;
1101 if (sendalot)
1102 goto again;
1103 cb->s_outx = 5;
1104 return (0);
1105}
1106
1107static int spx_do_persist_panics = 0;
1108
1109static void
1110spx_setpersist(cb)
1111 register struct spxpcb *cb;
1112{
1113 register int t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1114
1115 if (cb->s_timer[SPXT_REXMT] && spx_do_persist_panics)
1116 panic("spx_output REXMT");
1117 /*
1118 * Start/restart persistance timer.
1119 */
1120 SPXT_RANGESET(cb->s_timer[SPXT_PERSIST],
1121 t*spx_backoff[cb->s_rxtshift],
1122 SPXTV_PERSMIN, SPXTV_PERSMAX);
1123 if (cb->s_rxtshift < SPX_MAXRXTSHIFT)
1124 cb->s_rxtshift++;
1125}
1126
1127int
1128spx_ctloutput(so, sopt)
1129 struct socket *so;
1130 struct sockopt *sopt;
1131{
1132 struct ipxpcb *ipxp = sotoipxpcb(so);
1133 register struct spxpcb *cb;
1134 int mask, error;
1135 short soptval;
1136 u_short usoptval;
1137 int optval;
1138
1139 error = 0;
1140
1141 if (sopt->sopt_level != IPXPROTO_SPX) {
1142 /* This will have to be changed when we do more general
1143 stacking of protocols */
1144 return (ipx_ctloutput(so, sopt));
1145 }
1146 if (ipxp == NULL)
1147 return (EINVAL);
1148 else
1149 cb = ipxtospxpcb(ipxp);
1150
1151 switch (sopt->sopt_dir) {
1152 case SOPT_GET:
1153 switch (sopt->sopt_name) {
1154 case SO_HEADERS_ON_INPUT:
1155 mask = SF_HI;
1156 goto get_flags;
1157
1158 case SO_HEADERS_ON_OUTPUT:
1159 mask = SF_HO;
1160 get_flags:
1161 soptval = cb->s_flags & mask;
1162 error = sooptcopyout(sopt, &soptval, sizeof soptval);
1163 break;
1164
1165 case SO_MTU:
1166 usoptval = cb->s_mtu;
1167 error = sooptcopyout(sopt, &usoptval, sizeof usoptval);
1168 break;
1169
1170 case SO_LAST_HEADER:
1171 error = sooptcopyout(sopt, &cb->s_rhdr,
1172 sizeof cb->s_rhdr);
1173 break;
1174
1175 case SO_DEFAULT_HEADERS:
1176 error = sooptcopyout(sopt, &cb->s_shdr,
1177 sizeof cb->s_shdr);
1178 break;
1179
1180 default:
1181 error = ENOPROTOOPT;
1182 }
1183 break;
1184
1185 case SOPT_SET:
1186 switch (sopt->sopt_name) {
1187 /* XXX why are these shorts on get and ints on set?
1188 that doesn't make any sense... */
1189 case SO_HEADERS_ON_INPUT:
1190 mask = SF_HI;
1191 goto set_head;
1192
1193 case SO_HEADERS_ON_OUTPUT:
1194 mask = SF_HO;
1195 set_head:
1196 error = sooptcopyin(sopt, &optval, sizeof optval,
1197 sizeof optval);
1198 if (error)
1199 break;
1200
1201 if (cb->s_flags & SF_PI) {
1202 if (optval)
1203 cb->s_flags |= mask;
1204 else
1205 cb->s_flags &= ~mask;
1206 } else error = EINVAL;
1207 break;
1208
1209 case SO_MTU:
1210 error = sooptcopyin(sopt, &usoptval, sizeof usoptval,
1211 sizeof usoptval);
1212 if (error)
1213 break;
1214 cb->s_mtu = usoptval;
1215 break;
1216
1217#ifdef SF_NEWCALL
1218 case SO_NEWCALL:
1219 error = sooptcopyin(sopt, &optval, sizeof optval,
1220 sizeof optval);
1221 if (error)
1222 break;
1223 if (optval) {
1224 cb->s_flags2 |= SF_NEWCALL;
1225 spx_newchecks[5]++;
1226 } else {
1227 cb->s_flags2 &= ~SF_NEWCALL;
1228 spx_newchecks[6]++;
1229 }
1230 break;
1231#endif
1232
1233 case SO_DEFAULT_HEADERS:
1234 {
1235 struct spxhdr sp;
1236
1237 error = sooptcopyin(sopt, &sp, sizeof sp,
1238 sizeof sp);
1239 if (error)
1240 break;
1241 cb->s_dt = sp.spx_dt;
1242 cb->s_cc = sp.spx_cc & SPX_EM;
1243 }
1244 break;
1245
1246 default:
1247 error = ENOPROTOOPT;
1248 }
1249 break;
1250 }
1251 return (error);
1252}
1253
1254static int
1255spx_usr_abort(so)
1256 struct socket *so;
1257{
1258 int s;
1259 struct ipxpcb *ipxp;
1260 struct spxpcb *cb;
1261
1262 ipxp = sotoipxpcb(so);
1263 cb = ipxtospxpcb(ipxp);
1264
1265 s = splnet();
1266 spx_drop(cb, ECONNABORTED);
1267 splx(s);
1268 return (0);
1269}
1270
1271/*
1272 * Accept a connection. Essentially all the work is
1273 * done at higher levels; just return the address
1274 * of the peer, storing through addr.
1275 */
1276static int
1277spx_accept(so, nam)
1278 struct socket *so;
1279 struct sockaddr **nam;
1280{
1281 struct ipxpcb *ipxp;
1282 struct sockaddr_ipx *sipx, ssipx;
1283
1284 ipxp = sotoipxpcb(so);
1285 sipx = &ssipx;
1286 bzero(sipx, sizeof *sipx);
1287 sipx->sipx_len = sizeof *sipx;
1288 sipx->sipx_family = AF_IPX;
1289 sipx->sipx_addr = ipxp->ipxp_faddr;
1290 *nam = sodupsockaddr((struct sockaddr *)sipx, M_NOWAIT);
1291 return (0);
1292}
1293
1294static int
1295spx_attach(so, proto, td)
1296 struct socket *so;
1297 int proto;
1298 struct thread *td;
1299{
1300 int error;
1301 int s;
1302 struct ipxpcb *ipxp;
1303 struct spxpcb *cb;
1304 struct mbuf *mm;
1305 struct sockbuf *sb;
1306
1307 ipxp = sotoipxpcb(so);
1308 cb = ipxtospxpcb(ipxp);
1309
1310 if (ipxp != NULL)
1311 return (EISCONN);
1312 s = splnet();
1313 error = ipx_pcballoc(so, &ipxpcb, td);
1314 if (error)
1315 goto spx_attach_end;
1316 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1317 error = soreserve(so, (u_long) 3072, (u_long) 3072);
1318 if (error)
1319 goto spx_attach_end;
1320 }
1321 ipxp = sotoipxpcb(so);
1322
1323 MALLOC(cb, struct spxpcb *, sizeof *cb, M_PCB, M_NOWAIT | M_ZERO);
1324
1325 if (cb == NULL) {
1326 error = ENOBUFS;
1327 goto spx_attach_end;
1328 }
1329 sb = &so->so_snd;
1330
1331 mm = m_getclr(M_DONTWAIT, MT_HEADER);
1332 if (mm == NULL) {
1333 FREE(cb, M_PCB);
1334 error = ENOBUFS;
1335 goto spx_attach_end;
1336 }
1337 cb->s_ipx = mtod(mm, struct ipx *);
1338 cb->s_state = TCPS_LISTEN;
1339 cb->s_smax = -1;
1340 cb->s_swl1 = -1;
1341 cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q;
1342 cb->s_ipxpcb = ipxp;
1343 cb->s_mtu = 576 - sizeof(struct spx);
1344 cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu;
1345 cb->s_ssthresh = cb->s_cwnd;
1346 cb->s_cwmx = sbspace(sb) * CUNIT / (2 * sizeof(struct spx));
1347 /* Above is recomputed when connecting to account
1348 for changed buffering or mtu's */
1349 cb->s_rtt = SPXTV_SRTTBASE;
1350 cb->s_rttvar = SPXTV_SRTTDFLT << 2;
1351 SPXT_RANGESET(cb->s_rxtcur,
1352 ((SPXTV_SRTTBASE >> 2) + (SPXTV_SRTTDFLT << 2)) >> 1,
1353 SPXTV_MIN, SPXTV_REXMTMAX);
1354 ipxp->ipxp_pcb = (caddr_t)cb;
1355spx_attach_end:
1356 splx(s);
1357 return (error);
1358}
1359
1360static int
1361spx_bind(so, nam, td)
1362 struct socket *so;
1363 struct sockaddr *nam;
1364 struct thread *td;
1365{
1366 struct ipxpcb *ipxp;
1367
1368 ipxp = sotoipxpcb(so);
1369
1370 return (ipx_pcbbind(ipxp, nam, td));
1371}
1372
1373/*
1374 * Initiate connection to peer.
1375 * Enter SYN_SENT state, and mark socket as connecting.
1376 * Start keep-alive timer, setup prototype header,
1377 * Send initial system packet requesting connection.
1378 */
1379static int
1380spx_connect(so, nam, td)
1381 struct socket *so;
1382 struct sockaddr *nam;
1383 struct thread *td;
1384{
1385 int error;
1386 int s;
1387 struct ipxpcb *ipxp;
1388 struct spxpcb *cb;
1389
1390 ipxp = sotoipxpcb(so);
1391 cb = ipxtospxpcb(ipxp);
1392
1393 s = splnet();
1394 if (ipxp->ipxp_lport == 0) {
1395 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
1396 if (error)
1397 goto spx_connect_end;
1398 }
1399 error = ipx_pcbconnect(ipxp, nam, td);
1400 if (error)
1401 goto spx_connect_end;
1402 soisconnecting(so);
1403 spxstat.spxs_connattempt++;
1404 cb->s_state = TCPS_SYN_SENT;
1405 cb->s_did = 0;
1406 spx_template(cb);
1407 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
1408 cb->s_force = 1 + SPXTV_KEEP;
1409 /*
1410 * Other party is required to respond to
1411 * the port I send from, but he is not
1412 * required to answer from where I am sending to,
1413 * so allow wildcarding.
1414 * original port I am sending to is still saved in
1415 * cb->s_dport.
1416 */
1417 ipxp->ipxp_fport = 0;
1418 error = spx_output(cb, (struct mbuf *)NULL);
1419spx_connect_end:
1420 splx(s);
1421 return (error);
1422}
1423
1424static int
1425spx_detach(so)
1426 struct socket *so;
1427{
1428 int s;
1429 struct ipxpcb *ipxp;
1430 struct spxpcb *cb;
1431
1432 ipxp = sotoipxpcb(so);
1433 cb = ipxtospxpcb(ipxp);
1434
1435 if (ipxp == NULL)
1436 return (ENOTCONN);
1437 s = splnet();
1438 if (cb->s_state > TCPS_LISTEN)
1439 spx_disconnect(cb);
1440 else
1441 spx_close(cb);
1442 splx(s);
1443 return (0);
1444}
1445
1446/*
1447 * We may decide later to implement connection closing
1448 * handshaking at the spx level optionally.
1449 * here is the hook to do it:
1450 */
1451static int
1452spx_usr_disconnect(so)
1453 struct socket *so;
1454{
1455 int s;
1456 struct ipxpcb *ipxp;
1457 struct spxpcb *cb;
1458
1459 ipxp = sotoipxpcb(so);
1460 cb = ipxtospxpcb(ipxp);
1461
1462 s = splnet();
1463 spx_disconnect(cb);
1464 splx(s);
1465 return (0);
1466}
1467
1468static int
1469spx_listen(so, td)
1470 struct socket *so;
1471 struct thread *td;
1472{
1473 int error;
1474 struct ipxpcb *ipxp;
1475 struct spxpcb *cb;
1476
1477 error = 0;
1478 ipxp = sotoipxpcb(so);
1479 cb = ipxtospxpcb(ipxp);
1480
1481 if (ipxp->ipxp_lport == 0)
1482 error = ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
1483 if (error == 0)
1484 cb->s_state = TCPS_LISTEN;
1485 return (error);
1486}
1487
1488/*
1489 * After a receive, possibly send acknowledgment
1490 * updating allocation.
1491 */
1492static int
1493spx_rcvd(so, flags)
1494 struct socket *so;
1495 int flags;
1496{
1497 int s;
1498 struct ipxpcb *ipxp;
1499 struct spxpcb *cb;
1500
1501 ipxp = sotoipxpcb(so);
1502 cb = ipxtospxpcb(ipxp);
1503
1504 s = splnet();
1505 cb->s_flags |= SF_RVD;
1506 spx_output(cb, (struct mbuf *)NULL);
1507 cb->s_flags &= ~SF_RVD;
1508 splx(s);
1509 return (0);
1510}
1511
1512static int
1513spx_rcvoob(so, m, flags)
1514 struct socket *so;
1515 struct mbuf *m;
1516 int flags;
1517{
1518 struct ipxpcb *ipxp;
1519 struct spxpcb *cb;
1520
1521 ipxp = sotoipxpcb(so);
1522 cb = ipxtospxpcb(ipxp);
1523
1524 if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
1525 (so->so_rcv.sb_state & SBS_RCVATMARK)) {
1526 m->m_len = 1;
1527 *mtod(m, caddr_t) = cb->s_iobc;
1528 return (0);
1529 }
1530 return (EINVAL);
1531}
1532
1533static int
1534spx_send(so, flags, m, addr, controlp, td)
1535 struct socket *so;
1536 int flags;
1537 struct mbuf *m;
1538 struct sockaddr *addr;
1539 struct mbuf *controlp;
1540 struct thread *td;
1541{
1542 int error;
1543 int s;
1544 struct ipxpcb *ipxp;
1545 struct spxpcb *cb;
1546
1547 error = 0;
1548 ipxp = sotoipxpcb(so);
1549 cb = ipxtospxpcb(ipxp);
1550
1551 s = splnet();
1552 if (flags & PRUS_OOB) {
1553 if (sbspace(&so->so_snd) < -512) {
1554 error = ENOBUFS;
1555 goto spx_send_end;
1556 }
1557 cb->s_oobflags |= SF_SOOB;
1558 }
1559 if (controlp != NULL) {
1560 u_short *p = mtod(controlp, u_short *);
1561 spx_newchecks[2]++;
1562 if ((p[0] == 5) && (p[1] == 1)) { /* XXXX, for testing */
1563 cb->s_shdr.spx_dt = *(u_char *)(&p[2]);
1564 spx_newchecks[3]++;
1565 }
1566 m_freem(controlp);
1567 }
1568 controlp = NULL;
1569 error = spx_output(cb, m);
1570 m = NULL;
1571spx_send_end:
1572 if (controlp != NULL)
1573 m_freem(controlp);
1574 if (m != NULL)
1575 m_freem(m);
1576 splx(s);
1577 return (error);
1578}
1579
1580static int
1581spx_shutdown(so)
1582 struct socket *so;
1583{
1584 int error;
1585 int s;
1586 struct ipxpcb *ipxp;
1587 struct spxpcb *cb;
1588
1589 error = 0;
1590 ipxp = sotoipxpcb(so);
1591 cb = ipxtospxpcb(ipxp);
1592
1593 s = splnet();
1594 socantsendmore(so);
1595 cb = spx_usrclosed(cb);
1596 if (cb != NULL)
1597 error = spx_output(cb, (struct mbuf *)NULL);
1598 splx(s);
1599 return (error);
1600}
1601
1602static int
1603spx_sp_attach(so, proto, td)
1604 struct socket *so;
1605 int proto;
1606 struct thread *td;
1607{
1608 int error;
1609 struct ipxpcb *ipxp;
1610
1611 error = spx_attach(so, proto, td);
1612 if (error == 0) {
1613 ipxp = sotoipxpcb(so);
1614 ((struct spxpcb *)ipxp->ipxp_pcb)->s_flags |=
1615 (SF_HI | SF_HO | SF_PI);
1616 }
1617 return (error);
1618}
1619
1620/*
1621 * Create template to be used to send spx packets on a connection.
1622 * Called after host entry created, fills
1623 * in a skeletal spx header (choosing connection id),
1624 * minimizing the amount of work necessary when the connection is used.
1625 */
1626static void
1627spx_template(cb)
1628 register struct spxpcb *cb;
1629{
1630 register struct ipxpcb *ipxp = cb->s_ipxpcb;
1631 register struct ipx *ipx = cb->s_ipx;
1632 register struct sockbuf *sb = &(ipxp->ipxp_socket->so_snd);
1633
1634 ipx->ipx_pt = IPXPROTO_SPX;
1635 ipx->ipx_sna = ipxp->ipxp_laddr;
1636 ipx->ipx_dna = ipxp->ipxp_faddr;
1637 cb->s_sid = htons(spx_iss);
1638 spx_iss += SPX_ISSINCR/2;
1639 cb->s_alo = 1;
1640 cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu;
1641 cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement
1642 of large packets */
1643 cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spx));
1644 cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd);
1645 /* But allow for lots of little packets as well */
1646}
1647
1648/*
1649 * Close a SPIP control block:
1650 * discard spx control block itself
1651 * discard ipx protocol control block
1652 * wake up any sleepers
1653 */
1654static struct spxpcb *
1655spx_close(cb)
1656 register struct spxpcb *cb;
1657{
1658 register struct spx_q *s;
1659 struct ipxpcb *ipxp = cb->s_ipxpcb;
1660 struct socket *so = ipxp->ipxp_socket;
1661 register struct mbuf *m;
1662
1663 s = cb->s_q.si_next;
1664 while (s != &(cb->s_q)) {
1665 s = s->si_next;
1666 m = dtom(s->si_prev);
1667 remque(s->si_prev);
1668 m_freem(m);
1669 }
1670 m_free(dtom(cb->s_ipx));
1671 FREE(cb, M_PCB);
1672 ipxp->ipxp_pcb = 0;
1673 soisdisconnected(so);
1674 ipx_pcbdetach(ipxp);
1675 spxstat.spxs_closed++;
1676 return ((struct spxpcb *)NULL);
1677}
1678
1679/*
1680 * Someday we may do level 3 handshaking
1681 * to close a connection or send a xerox style error.
1682 * For now, just close.
1683 */
1684static struct spxpcb *
1685spx_usrclosed(cb)
1686 register struct spxpcb *cb;
1687{
1688 return (spx_close(cb));
1689}
1690
1691static struct spxpcb *
1692spx_disconnect(cb)
1693 register struct spxpcb *cb;
1694{
1695 return (spx_close(cb));
1696}
1697
1698/*
1699 * Drop connection, reporting
1700 * the specified error.
1701 */
1702static struct spxpcb *
1703spx_drop(cb, errno)
1704 register struct spxpcb *cb;
1705 int errno;
1706{
1707 struct socket *so = cb->s_ipxpcb->ipxp_socket;
1708
1709 /*
1710 * someday, in the xerox world
1711 * we will generate error protocol packets
1712 * announcing that the socket has gone away.
1713 */
1714 if (TCPS_HAVERCVDSYN(cb->s_state)) {
1715 spxstat.spxs_drops++;
1716 cb->s_state = TCPS_CLOSED;
1717 /*tcp_output(cb);*/
1718 } else
1719 spxstat.spxs_conndrops++;
1720 so->so_error = errno;
1721 return (spx_close(cb));
1722}
1723
1724/*
1725 * Fast timeout routine for processing delayed acks
1726 */
1727void
1728spx_fasttimo()
1729{
1730 register struct ipxpcb *ipxp;
1731 register struct spxpcb *cb;
1732 int s = splnet();
1733
1734 ipxp = ipxpcb.ipxp_next;
1735 if (ipxp != NULL)
1736 for (; ipxp != &ipxpcb; ipxp = ipxp->ipxp_next)
1737 if ((cb = (struct spxpcb *)ipxp->ipxp_pcb) != NULL &&
1738 (cb->s_flags & SF_DELACK)) {
1739 cb->s_flags &= ~SF_DELACK;
1740 cb->s_flags |= SF_ACKNOW;
1741 spxstat.spxs_delack++;
1742 spx_output(cb, (struct mbuf *)NULL);
1743 }
1744 splx(s);
1745}
1746
1747/*
1748 * spx protocol timeout routine called every 500 ms.
1749 * Updates the timers in all active pcb's and
1750 * causes finite state machine actions if timers expire.
1751 */
1752void
1753spx_slowtimo()
1754{
1755 register struct ipxpcb *ip, *ipnxt;
1756 register struct spxpcb *cb;
1757 int s = splnet();
1758 register int i;
1759
1760 /*
1761 * Search through tcb's and update active timers.
1762 */
1763 ip = ipxpcb.ipxp_next;
1764 if (ip == NULL) {
1765 splx(s);
1766 return;
1767 }
1768 while (ip != &ipxpcb) {
1769 cb = ipxtospxpcb(ip);
1770 ipnxt = ip->ipxp_next;
1771 if (cb == NULL)
1772 goto tpgone;
1773 for (i = 0; i < SPXT_NTIMERS; i++) {
1774 if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
1775 spx_timers(cb, i);
1776 if (ipnxt->ipxp_prev != ip)
1777 goto tpgone;
1778 }
1779 }
1780 cb->s_idle++;
1781 if (cb->s_rtt)
1782 cb->s_rtt++;
1783tpgone:
1784 ip = ipnxt;
1785 }
1786 spx_iss += SPX_ISSINCR/PR_SLOWHZ; /* increment iss */
1787 splx(s);
1788}
1789
1790/*
1791 * SPX timer processing.
1792 */
1793static struct spxpcb *
1794spx_timers(cb, timer)
1795 register struct spxpcb *cb;
1796 int timer;
1797{
1798 long rexmt;
1799 int win;
1800
1801 cb->s_force = 1 + timer;
1802 switch (timer) {
1803
1804 /*
1805 * 2 MSL timeout in shutdown went off. TCP deletes connection
1806 * control block.
1807 */
1808 case SPXT_2MSL:
1809 printf("spx: SPXT_2MSL went off for no reason\n");
1810 cb->s_timer[timer] = 0;
1811 break;
1812
1813 /*
1814 * Retransmission timer went off. Message has not
1815 * been acked within retransmit interval. Back off
1816 * to a longer retransmit interval and retransmit one packet.
1817 */
1818 case SPXT_REXMT:
1819 if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) {
1820 cb->s_rxtshift = SPX_MAXRXTSHIFT;
1821 spxstat.spxs_timeoutdrop++;
1822 cb = spx_drop(cb, ETIMEDOUT);
1823 break;
1824 }
1825 spxstat.spxs_rexmttimeo++;
1826 rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1827 rexmt *= spx_backoff[cb->s_rxtshift];
1828 SPXT_RANGESET(cb->s_rxtcur, rexmt, SPXTV_MIN, SPXTV_REXMTMAX);
1829 cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
1830 /*
1831 * If we have backed off fairly far, our srtt
1832 * estimate is probably bogus. Clobber it
1833 * so we'll take the next rtt measurement as our srtt;
1834 * move the current srtt into rttvar to keep the current
1835 * retransmit times until then.
1836 */
1837 if (cb->s_rxtshift > SPX_MAXRXTSHIFT / 4 ) {
1838 cb->s_rttvar += (cb->s_srtt >> 2);
1839 cb->s_srtt = 0;
1840 }
1841 cb->s_snxt = cb->s_rack;
1842 /*
1843 * If timing a packet, stop the timer.
1844 */
1845 cb->s_rtt = 0;
1846 /*
1847 * See very long discussion in tcp_timer.c about congestion
1848 * window and sstrhesh
1849 */
1850 win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2;
1851 if (win < 2)
1852 win = 2;
1853 cb->s_cwnd = CUNIT;
1854 cb->s_ssthresh = win * CUNIT;
1855 spx_output(cb, (struct mbuf *)NULL);
1856 break;
1857
1858 /*
1859 * Persistance timer into zero window.
1860 * Force a probe to be sent.
1861 */
1862 case SPXT_PERSIST:
1863 spxstat.spxs_persisttimeo++;
1864 spx_setpersist(cb);
1865 spx_output(cb, (struct mbuf *)NULL);
1866 break;
1867
1868 /*
1869 * Keep-alive timer went off; send something
1870 * or drop connection if idle for too long.
1871 */
1872 case SPXT_KEEP:
1873 spxstat.spxs_keeptimeo++;
1874 if (cb->s_state < TCPS_ESTABLISHED)
1875 goto dropit;
1876 if (cb->s_ipxpcb->ipxp_socket->so_options & SO_KEEPALIVE) {
1877 if (cb->s_idle >= SPXTV_MAXIDLE)
1878 goto dropit;
1879 spxstat.spxs_keepprobe++;
1880 spx_output(cb, (struct mbuf *)NULL);
1881 } else
1882 cb->s_idle = 0;
1883 cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
1884 break;
1885 dropit:
1886 spxstat.spxs_keepdrops++;
1887 cb = spx_drop(cb, ETIMEDOUT);
1888 break;
1889 }
1890 return (cb);
1891}