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1.1 root 1: /*
2: * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution is only permitted until one year after the first shipment
6: * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
7: * binary forms are permitted provided that: (1) source distributions retain
8: * this entire copyright notice and comment, and (2) distributions including
9: * binaries display the following acknowledgement: This product includes
10: * software developed by the University of California, Berkeley and its
11: * contributors'' in the documentation or other materials provided with the
12: * distribution and in all advertising materials mentioning features or use
13: * of this software. Neither the name of the University nor the names of
14: * its contributors may be used to endorse or promote products derived from
15: * this software without specific prior written permission.
16: * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19: *
20: * @(#)spp_usrreq.c 7.14 (Berkeley) 6/28/90
21: */
22:
23: #include "param.h"
24: #include "systm.h"
25: #include "user.h"
26: #include "malloc.h"
27: #include "mbuf.h"
28: #include "protosw.h"
29: #include "socket.h"
30: #include "socketvar.h"
31: #include "errno.h"
32:
33: #include "../net/if.h"
34: #include "../net/route.h"
35: #include "../netinet/tcp_fsm.h"
36:
37: #include "ns.h"
38: #include "ns_pcb.h"
39: #include "idp.h"
40: #include "idp_var.h"
41: #include "ns_error.h"
42: #include "sp.h"
43: #include "spidp.h"
44: #include "spp_timer.h"
45: #include "spp_var.h"
46: #include "spp_debug.h"
47:
48: /*
49: * SP protocol implementation.
50: */
51: spp_init()
52: {
53:
54: spp_iss = 1; /* WRONG !! should fish it out of TODR */
55: }
56: struct spidp spp_savesi;
57: int traceallspps = 0;
58: extern int sppconsdebug;
59: int spp_hardnosed;
60: int spp_use_delack = 0;
61: u_short spp_newchecks[50];
62:
63: /*ARGSUSED*/
64: spp_input(m, nsp)
65: register struct mbuf *m;
66: register struct nspcb *nsp;
67: {
68: register struct sppcb *cb;
69: register struct spidp *si = mtod(m, struct spidp *);
70: register struct socket *so;
71: short ostate;
72: int dropsocket = 0;
73:
74:
75: sppstat.spps_rcvtotal++;
76: if (nsp == 0) {
77: panic("No nspcb in spp_input\n");
78: return;
79: }
80:
81: cb = nstosppcb(nsp);
82: if (cb == 0) goto bad;
83:
84: if (m->m_len < sizeof(*si)) {
85: if ((m = m_pullup(m, sizeof(*si))) == 0) {
86: sppstat.spps_rcvshort++;
87: return;
88: }
89: si = mtod(m, struct spidp *);
90: }
91: si->si_seq = ntohs(si->si_seq);
92: si->si_ack = ntohs(si->si_ack);
93: si->si_alo = ntohs(si->si_alo);
94:
95: so = nsp->nsp_socket;
96: if (so->so_options & SO_DEBUG || traceallspps) {
97: ostate = cb->s_state;
98: spp_savesi = *si;
99: }
100: if (so->so_options & SO_ACCEPTCONN) {
101: struct sppcb *ocb = cb;
102:
103: so = sonewconn(so, 0);
104: if (so == 0) {
105: goto drop;
106: }
107: /*
108: * This is ugly, but ....
109: *
110: * Mark socket as temporary until we're
111: * committed to keeping it. The code at
112: * ``drop'' and ``dropwithreset'' check the
113: * flag dropsocket to see if the temporary
114: * socket created here should be discarded.
115: * We mark the socket as discardable until
116: * we're committed to it below in TCPS_LISTEN.
117: */
118: dropsocket++;
119: nsp = (struct nspcb *)so->so_pcb;
120: nsp->nsp_laddr = si->si_dna;
121: cb = nstosppcb(nsp);
122: cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
123: cb->s_flags = ocb->s_flags; /* preserve sockopts */
124: cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
125: cb->s_state = TCPS_LISTEN;
126: }
127:
128: /*
129: * Packet received on connection.
130: * reset idle time and keep-alive timer;
131: */
132: cb->s_idle = 0;
133: cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
134:
135: switch (cb->s_state) {
136:
137: case TCPS_LISTEN:{
138: struct mbuf *am;
139: register struct sockaddr_ns *sns;
140: struct ns_addr laddr;
141:
142: /*
143: * If somebody here was carying on a conversation
144: * and went away, and his pen pal thinks he can
145: * still talk, we get the misdirected packet.
146: */
147: if (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
148: spp_istat.gonawy++;
149: goto dropwithreset;
150: }
151: am = m_get(M_DONTWAIT, MT_SONAME);
152: if (am == NULL)
153: goto drop;
154: am->m_len = sizeof (struct sockaddr_ns);
155: sns = mtod(am, struct sockaddr_ns *);
156: sns->sns_len = sizeof(*sns);
157: sns->sns_family = AF_NS;
158: sns->sns_addr = si->si_sna;
159: laddr = nsp->nsp_laddr;
160: if (ns_nullhost(laddr))
161: nsp->nsp_laddr = si->si_dna;
162: if (ns_pcbconnect(nsp, am)) {
163: nsp->nsp_laddr = laddr;
164: (void) m_free(am);
165: spp_istat.noconn++;
166: goto drop;
167: }
168: (void) m_free(am);
169: spp_template(cb);
170: dropsocket = 0; /* committed to socket */
171: cb->s_did = si->si_sid;
172: cb->s_rack = si->si_ack;
173: cb->s_ralo = si->si_alo;
174: #define THREEWAYSHAKE
175: #ifdef THREEWAYSHAKE
176: cb->s_state = TCPS_SYN_RECEIVED;
177: cb->s_force = 1 + SPPT_KEEP;
178: sppstat.spps_accepts++;
179: cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
180: }
181: break;
182: /*
183: * This state means that we have heard a response
184: * to our acceptance of their connection
185: * It is probably logically unnecessary in this
186: * implementation.
187: */
188: case TCPS_SYN_RECEIVED: {
189: if (si->si_did!=cb->s_sid) {
190: spp_istat.wrncon++;
191: goto drop;
192: }
193: #endif
194: nsp->nsp_fport = si->si_sport;
195: cb->s_timer[SPPT_REXMT] = 0;
196: cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
197: soisconnected(so);
198: cb->s_state = TCPS_ESTABLISHED;
199: sppstat.spps_accepts++;
200: }
201: break;
202:
203: /*
204: * This state means that we have gotten a response
205: * to our attempt to establish a connection.
206: * We fill in the data from the other side,
207: * telling us which port to respond to, instead of the well-
208: * known one we might have sent to in the first place.
209: * We also require that this is a response to our
210: * connection id.
211: */
212: case TCPS_SYN_SENT:
213: if (si->si_did!=cb->s_sid) {
214: spp_istat.notme++;
215: goto drop;
216: }
217: sppstat.spps_connects++;
218: cb->s_did = si->si_sid;
219: cb->s_rack = si->si_ack;
220: cb->s_ralo = si->si_alo;
221: cb->s_dport = nsp->nsp_fport = si->si_sport;
222: cb->s_timer[SPPT_REXMT] = 0;
223: cb->s_flags |= SF_ACKNOW;
224: soisconnected(so);
225: cb->s_state = TCPS_ESTABLISHED;
226: /* Use roundtrip time of connection request for initial rtt */
227: if (cb->s_rtt) {
228: cb->s_srtt = cb->s_rtt << 3;
229: cb->s_rttvar = cb->s_rtt << 1;
230: SPPT_RANGESET(cb->s_rxtcur,
231: ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
232: SPPTV_MIN, SPPTV_REXMTMAX);
233: cb->s_rtt = 0;
234: }
235: }
236: if (so->so_options & SO_DEBUG || traceallspps)
237: spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0);
238:
239: m->m_len -= sizeof (struct idp);
240: m->m_pkthdr.len -= sizeof (struct idp);
241: m->m_data += sizeof (struct idp);
242:
243: if (spp_reass(cb, si)) {
244: (void) m_freem(m);
245: }
246: if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
247: (void) spp_output(cb, (struct mbuf *)0);
248: cb->s_flags &= ~(SF_WIN|SF_RXT);
249: return;
250:
251: dropwithreset:
252: if (dropsocket)
253: (void) soabort(so);
254: si->si_seq = ntohs(si->si_seq);
255: si->si_ack = ntohs(si->si_ack);
256: si->si_alo = ntohs(si->si_alo);
257: ns_error(dtom(si), NS_ERR_NOSOCK, 0);
258: if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps)
259: spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
260: return;
261:
262: drop:
263: bad:
264: if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG ||
265: traceallspps)
266: spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
267: m_freem(m);
268: }
269:
270: int spprexmtthresh = 3;
271:
272: /*
273: * This is structurally similar to the tcp reassembly routine
274: * but its function is somewhat different: It merely queues
275: * packets up, and suppresses duplicates.
276: */
277: spp_reass(cb, si)
278: register struct sppcb *cb;
279: register struct spidp *si;
280: {
281: register struct spidp_q *q;
282: register struct mbuf *m;
283: register struct socket *so = cb->s_nspcb->nsp_socket;
284: char packetp = cb->s_flags & SF_HI;
285: int incr;
286: char wakeup = 0;
287:
288: if (si == SI(0))
289: goto present;
290: /*
291: * Update our news from them.
292: */
293: if (si->si_cc & SP_SA)
294: cb->s_flags |= (spp_use_delack ? SF_DELACK : SF_ACKNOW);
295: if (SSEQ_GT(si->si_alo, cb->s_ralo))
296: cb->s_flags |= SF_WIN;
297: if (SSEQ_LEQ(si->si_ack, cb->s_rack)) {
298: if ((si->si_cc & SP_SP) && cb->s_rack != (cb->s_smax + 1)) {
299: sppstat.spps_rcvdupack++;
300: /*
301: * If this is a completely duplicate ack
302: * and other conditions hold, we assume
303: * a packet has been dropped and retransmit
304: * it exactly as in tcp_input().
305: */
306: if (si->si_ack != cb->s_rack ||
307: si->si_alo != cb->s_ralo)
308: cb->s_dupacks = 0;
309: else if (++cb->s_dupacks == spprexmtthresh) {
310: u_short onxt = cb->s_snxt;
311: int cwnd = cb->s_cwnd;
312:
313: cb->s_snxt = si->si_ack;
314: cb->s_cwnd = CUNIT;
315: cb->s_force = 1 + SPPT_REXMT;
316: (void) spp_output(cb, (struct mbuf *)0);
317: cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
318: cb->s_rtt = 0;
319: if (cwnd >= 4 * CUNIT)
320: cb->s_cwnd = cwnd / 2;
321: if (SSEQ_GT(onxt, cb->s_snxt))
322: cb->s_snxt = onxt;
323: return (1);
324: }
325: } else
326: cb->s_dupacks = 0;
327: goto update_window;
328: }
329: cb->s_dupacks = 0;
330: /*
331: * If our correspondent acknowledges data we haven't sent
332: * TCP would drop the packet after acking. We'll be a little
333: * more permissive
334: */
335: if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) {
336: sppstat.spps_rcvacktoomuch++;
337: si->si_ack = cb->s_smax + 1;
338: }
339: sppstat.spps_rcvackpack++;
340: /*
341: * If transmit timer is running and timed sequence
342: * number was acked, update smoothed round trip time.
343: * See discussion of algorithm in tcp_input.c
344: */
345: if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) {
346: sppstat.spps_rttupdated++;
347: if (cb->s_srtt != 0) {
348: register short delta;
349: delta = cb->s_rtt - (cb->s_srtt >> 3);
350: if ((cb->s_srtt += delta) <= 0)
351: cb->s_srtt = 1;
352: if (delta < 0)
353: delta = -delta;
354: delta -= (cb->s_rttvar >> 2);
355: if ((cb->s_rttvar += delta) <= 0)
356: cb->s_rttvar = 1;
357: } else {
358: /*
359: * No rtt measurement yet
360: */
361: cb->s_srtt = cb->s_rtt << 3;
362: cb->s_rttvar = cb->s_rtt << 1;
363: }
364: cb->s_rtt = 0;
365: cb->s_rxtshift = 0;
366: SPPT_RANGESET(cb->s_rxtcur,
367: ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
368: SPPTV_MIN, SPPTV_REXMTMAX);
369: }
370: /*
371: * If all outstanding data is acked, stop retransmit
372: * timer and remember to restart (more output or persist).
373: * If there is more data to be acked, restart retransmit
374: * timer, using current (possibly backed-off) value;
375: */
376: if (si->si_ack == cb->s_smax + 1) {
377: cb->s_timer[SPPT_REXMT] = 0;
378: cb->s_flags |= SF_RXT;
379: } else if (cb->s_timer[SPPT_PERSIST] == 0)
380: cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
381: /*
382: * When new data is acked, open the congestion window.
383: * If the window gives us less than ssthresh packets
384: * in flight, open exponentially (maxseg at a time).
385: * Otherwise open linearly (maxseg^2 / cwnd at a time).
386: */
387: incr = CUNIT;
388: if (cb->s_cwnd > cb->s_ssthresh)
389: incr = max(incr * incr / cb->s_cwnd, 1);
390: cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx);
391: /*
392: * Trim Acked data from output queue.
393: */
394: while ((m = so->so_snd.sb_mb) != NULL) {
395: if (SSEQ_LT((mtod(m, struct spidp *))->si_seq, si->si_ack))
396: sbdroprecord(&so->so_snd);
397: else
398: break;
399: }
400: sowwakeup(so);
401: cb->s_rack = si->si_ack;
402: update_window:
403: if (SSEQ_LT(cb->s_snxt, cb->s_rack))
404: cb->s_snxt = cb->s_rack;
405: if (SSEQ_LT(cb->s_swl1, si->si_seq) || cb->s_swl1 == si->si_seq &&
406: (SSEQ_LT(cb->s_swl2, si->si_ack) ||
407: cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo))) {
408: /* keep track of pure window updates */
409: if ((si->si_cc & SP_SP) && cb->s_swl2 == si->si_ack
410: && SSEQ_LT(cb->s_ralo, si->si_alo)) {
411: sppstat.spps_rcvwinupd++;
412: sppstat.spps_rcvdupack--;
413: }
414: cb->s_ralo = si->si_alo;
415: cb->s_swl1 = si->si_seq;
416: cb->s_swl2 = si->si_ack;
417: cb->s_swnd = (1 + si->si_alo - si->si_ack);
418: if (cb->s_swnd > cb->s_smxw)
419: cb->s_smxw = cb->s_swnd;
420: cb->s_flags |= SF_WIN;
421: }
422: /*
423: * If this packet number is higher than that which
424: * we have allocated refuse it, unless urgent
425: */
426: if (SSEQ_GT(si->si_seq, cb->s_alo)) {
427: if (si->si_cc & SP_SP) {
428: sppstat.spps_rcvwinprobe++;
429: return (1);
430: } else
431: sppstat.spps_rcvpackafterwin++;
432: if (si->si_cc & SP_OB) {
433: if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
434: ns_error(dtom(si), NS_ERR_FULLUP, 0);
435: return (0);
436: } /* else queue this packet; */
437: } else {
438: /*register struct socket *so = cb->s_nspcb->nsp_socket;
439: if (so->so_state && SS_NOFDREF) {
440: ns_error(dtom(si), NS_ERR_NOSOCK, 0);
441: (void)spp_close(cb);
442: } else
443: would crash system*/
444: spp_istat.notyet++;
445: ns_error(dtom(si), NS_ERR_FULLUP, 0);
446: return (0);
447: }
448: }
449: /*
450: * If this is a system packet, we don't need to
451: * queue it up, and won't update acknowledge #
452: */
453: if (si->si_cc & SP_SP) {
454: return (1);
455: }
456: /*
457: * We have already seen this packet, so drop.
458: */
459: if (SSEQ_LT(si->si_seq, cb->s_ack)) {
460: spp_istat.bdreas++;
461: sppstat.spps_rcvduppack++;
462: if (si->si_seq == cb->s_ack - 1)
463: spp_istat.lstdup++;
464: return (1);
465: }
466: /*
467: * Loop through all packets queued up to insert in
468: * appropriate sequence.
469: */
470: for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) {
471: if (si->si_seq == SI(q)->si_seq) {
472: sppstat.spps_rcvduppack++;
473: return (1);
474: }
475: if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) {
476: sppstat.spps_rcvoopack++;
477: break;
478: }
479: }
480: insque(si, q->si_prev);
481: /*
482: * If this packet is urgent, inform process
483: */
484: if (si->si_cc & SP_OB) {
485: cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
486: sohasoutofband(so);
487: cb->s_oobflags |= SF_IOOB;
488: }
489: present:
490: #define SPINC sizeof(struct sphdr)
491: /*
492: * Loop through all packets queued up to update acknowledge
493: * number, and present all acknowledged data to user;
494: * If in packet interface mode, show packet headers.
495: */
496: for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) {
497: if (SI(q)->si_seq == cb->s_ack) {
498: cb->s_ack++;
499: m = dtom(q);
500: if (SI(q)->si_cc & SP_OB) {
501: cb->s_oobflags &= ~SF_IOOB;
502: if (so->so_rcv.sb_cc)
503: so->so_oobmark = so->so_rcv.sb_cc;
504: else
505: so->so_state |= SS_RCVATMARK;
506: }
507: q = q->si_prev;
508: remque(q->si_next);
509: wakeup = 1;
510: sppstat.spps_rcvpack++;
511: #ifdef SF_NEWCALL
512: if (cb->s_flags2 & SF_NEWCALL) {
513: struct sphdr *sp = mtod(m, struct sphdr *);
514: u_char dt = sp->sp_dt;
515: spp_newchecks[4]++;
516: if (dt != cb->s_rhdr.sp_dt) {
517: struct mbuf *mm =
518: m_getclr(M_DONTWAIT, MT_CONTROL);
519: spp_newchecks[0]++;
520: if (mm != NULL) {
521: u_short *s =
522: mtod(mm, u_short *);
523: cb->s_rhdr.sp_dt = dt;
524: mm->m_len = 5; /*XXX*/
525: s[0] = 5;
526: s[1] = 1;
527: *(u_char *)(&s[2]) = dt;
528: sbappend(&so->so_rcv, mm);
529: }
530: }
531: if (sp->sp_cc & SP_OB) {
532: MCHTYPE(m, MT_OOBDATA);
533: spp_newchecks[1]++;
534: so->so_oobmark = 0;
535: so->so_state &= ~SS_RCVATMARK;
536: }
537: if (packetp == 0) {
538: m->m_data += SPINC;
539: m->m_len -= SPINC;
540: m->m_pkthdr.len -= SPINC;
541: }
542: if ((sp->sp_cc & SP_EM) || packetp) {
543: sbappendrecord(&so->so_rcv, m);
544: spp_newchecks[9]++;
545: } else
546: sbappend(&so->so_rcv, m);
547: } else
548: #endif
549: if (packetp) {
550: sbappendrecord(&so->so_rcv, m);
551: } else {
552: cb->s_rhdr = *mtod(m, struct sphdr *);
553: m->m_data += SPINC;
554: m->m_len -= SPINC;
555: m->m_pkthdr.len -= SPINC;
556: sbappend(&so->so_rcv, m);
557: }
558: } else
559: break;
560: }
561: if (wakeup) sorwakeup(so);
562: return (0);
563: }
564:
565: spp_ctlinput(cmd, arg)
566: int cmd;
567: caddr_t arg;
568: {
569: struct ns_addr *na;
570: extern u_char nsctlerrmap[];
571: extern spp_abort(), spp_quench();
572: extern struct nspcb *idp_drop();
573: struct ns_errp *errp;
574: struct nspcb *nsp;
575: struct sockaddr_ns *sns;
576: int type;
577:
578: if (cmd < 0 || cmd > PRC_NCMDS)
579: return;
580: type = NS_ERR_UNREACH_HOST;
581:
582: switch (cmd) {
583:
584: case PRC_ROUTEDEAD:
585: return;
586:
587: case PRC_IFDOWN:
588: case PRC_HOSTDEAD:
589: case PRC_HOSTUNREACH:
590: sns = (struct sockaddr_ns *)arg;
591: if (sns->sns_family != AF_NS)
592: return;
593: na = &sns->sns_addr;
594: break;
595:
596: default:
597: errp = (struct ns_errp *)arg;
598: na = &errp->ns_err_idp.idp_dna;
599: type = errp->ns_err_num;
600: type = ntohs((u_short)type);
601: }
602: switch (type) {
603:
604: case NS_ERR_UNREACH_HOST:
605: ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0);
606: break;
607:
608: case NS_ERR_TOO_BIG:
609: case NS_ERR_NOSOCK:
610: nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port,
611: NS_WILDCARD);
612: if (nsp) {
613: if(nsp->nsp_pcb)
614: (void) spp_drop((struct sppcb *)nsp->nsp_pcb,
615: (int)nsctlerrmap[cmd]);
616: else
617: (void) idp_drop(nsp, (int)nsctlerrmap[cmd]);
618: }
619: break;
620:
621: case NS_ERR_FULLUP:
622: ns_pcbnotify(na, 0, spp_quench, (long) 0);
623: }
624: }
625: /*
626: * When a source quench is received, close congestion window
627: * to one packet. We will gradually open it again as we proceed.
628: */
629: spp_quench(nsp)
630: struct nspcb *nsp;
631: {
632: struct sppcb *cb = nstosppcb(nsp);
633:
634: if (cb)
635: cb->s_cwnd = CUNIT;
636: }
637:
638: #ifdef notdef
639: int
640: spp_fixmtu(nsp)
641: register struct nspcb *nsp;
642: {
643: register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb);
644: register struct mbuf *m;
645: register struct spidp *si;
646: struct ns_errp *ep;
647: struct sockbuf *sb;
648: int badseq, len;
649: struct mbuf *firstbad, *m0;
650:
651: if (cb) {
652: /*
653: * The notification that we have sent
654: * too much is bad news -- we will
655: * have to go through queued up so far
656: * splitting ones which are too big and
657: * reassigning sequence numbers and checksums.
658: * we should then retransmit all packets from
659: * one above the offending packet to the last one
660: * we had sent (or our allocation)
661: * then the offending one so that the any queued
662: * data at our destination will be discarded.
663: */
664: ep = (struct ns_errp *)nsp->nsp_notify_param;
665: sb = &nsp->nsp_socket->so_snd;
666: cb->s_mtu = ep->ns_err_param;
667: badseq = SI(&ep->ns_err_idp)->si_seq;
668: for (m = sb->sb_mb; m; m = m->m_act) {
669: si = mtod(m, struct spidp *);
670: if (si->si_seq == badseq)
671: break;
672: }
673: if (m == 0) return;
674: firstbad = m;
675: /*for (;;) {*/
676: /* calculate length */
677: for (m0 = m, len = 0; m ; m = m->m_next)
678: len += m->m_len;
679: if (len > cb->s_mtu) {
680: }
681: /* FINISH THIS
682: } */
683: }
684: }
685: #endif
686:
687: spp_output(cb, m0)
688: register struct sppcb *cb;
689: struct mbuf *m0;
690: {
691: struct socket *so = cb->s_nspcb->nsp_socket;
692: register struct mbuf *m;
693: register struct spidp *si = (struct spidp *) 0;
694: register struct sockbuf *sb = &so->so_snd;
695: int len = 0, win, rcv_win;
696: short span, off, recordp = 0;
697: u_short alo;
698: int error = 0, sendalot;
699: #ifdef notdef
700: int idle;
701: #endif
702: struct mbuf *mprev;
703: extern int idpcksum;
704:
705: if (m0) {
706: int mtu = cb->s_mtu;
707: int datalen;
708: /*
709: * Make sure that packet isn't too big.
710: */
711: for (m = m0; m ; m = m->m_next) {
712: mprev = m;
713: len += m->m_len;
714: if (m->m_flags & M_EOR)
715: recordp = 1;
716: }
717: datalen = (cb->s_flags & SF_HO) ?
718: len - sizeof (struct sphdr) : len;
719: if (datalen > mtu) {
720: if (cb->s_flags & SF_PI) {
721: m_freem(m0);
722: return (EMSGSIZE);
723: } else {
724: int oldEM = cb->s_cc & SP_EM;
725:
726: cb->s_cc &= ~SP_EM;
727: while (len > mtu) {
728: /*
729: * Here we are only being called
730: * from usrreq(), so it is OK to
731: * block.
732: */
733: m = m_copym(m0, 0, mtu, M_WAIT);
734: if (cb->s_flags & SF_NEWCALL) {
735: struct mbuf *mm = m;
736: spp_newchecks[7]++;
737: while (mm) {
738: mm->m_flags &= ~M_EOR;
739: mm = mm->m_next;
740: }
741: }
742: error = spp_output(cb, m);
743: if (error) {
744: cb->s_cc |= oldEM;
745: m_freem(m0);
746: return(error);
747: }
748: m_adj(m0, mtu);
749: len -= mtu;
750: }
751: cb->s_cc |= oldEM;
752: }
753: }
754: /*
755: * Force length even, by adding a "garbage byte" if
756: * necessary.
757: */
758: if (len & 1) {
759: m = mprev;
760: if (M_TRAILINGSPACE(m) >= 1)
761: m->m_len++;
762: else {
763: struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
764:
765: if (m1 == 0) {
766: m_freem(m0);
767: return (ENOBUFS);
768: }
769: m1->m_len = 1;
770: *(mtod(m1, u_char *)) = 0;
771: m->m_next = m1;
772: }
773: }
774: m = m_gethdr(M_DONTWAIT, MT_HEADER);
775: if (m == 0) {
776: m_freem(m0);
777: return (ENOBUFS);
778: }
779: /*
780: * Fill in mbuf with extended SP header
781: * and addresses and length put into network format.
782: */
783: MH_ALIGN(m, sizeof (struct spidp));
784: m->m_len = sizeof (struct spidp);
785: m->m_next = m0;
786: si = mtod(m, struct spidp *);
787: si->si_i = *cb->s_idp;
788: si->si_s = cb->s_shdr;
789: if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
790: register struct sphdr *sh;
791: if (m0->m_len < sizeof (*sh)) {
792: if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
793: (void) m_free(m);
794: m_freem(m0);
795: return (EINVAL);
796: }
797: m->m_next = m0;
798: }
799: sh = mtod(m0, struct sphdr *);
800: si->si_dt = sh->sp_dt;
801: si->si_cc |= sh->sp_cc & SP_EM;
802: m0->m_len -= sizeof (*sh);
803: m0->m_data += sizeof (*sh);
804: len -= sizeof (*sh);
805: }
806: len += sizeof(*si);
807: if ((cb->s_flags2 & SF_NEWCALL) && recordp) {
808: si->si_cc |= SP_EM;
809: spp_newchecks[8]++;
810: }
811: if (cb->s_oobflags & SF_SOOB) {
812: /*
813: * Per jqj@cornell:
814: * make sure OB packets convey exactly 1 byte.
815: * If the packet is 1 byte or larger, we
816: * have already guaranted there to be at least
817: * one garbage byte for the checksum, and
818: * extra bytes shouldn't hurt!
819: */
820: if (len > sizeof(*si)) {
821: si->si_cc |= SP_OB;
822: len = (1 + sizeof(*si));
823: }
824: }
825: si->si_len = htons((u_short)len);
826: m->m_pkthdr.len = ((len - 1) | 1) + 1;
827: /*
828: * queue stuff up for output
829: */
830: sbappendrecord(sb, m);
831: cb->s_seq++;
832: }
833: #ifdef notdef
834: idle = (cb->s_smax == (cb->s_rack - 1));
835: #endif
836: again:
837: sendalot = 0;
838: off = cb->s_snxt - cb->s_rack;
839: win = min(cb->s_swnd, (cb->s_cwnd/CUNIT));
840:
841: /*
842: * If in persist timeout with window of 0, send a probe.
843: * Otherwise, if window is small but nonzero
844: * and timer expired, send what we can and go into
845: * transmit state.
846: */
847: if (cb->s_force == 1 + SPPT_PERSIST) {
848: if (win != 0) {
849: cb->s_timer[SPPT_PERSIST] = 0;
850: cb->s_rxtshift = 0;
851: }
852: }
853: span = cb->s_seq - cb->s_rack;
854: len = min(span, win) - off;
855:
856: if (len < 0) {
857: /*
858: * Window shrank after we went into it.
859: * If window shrank to 0, cancel pending
860: * restransmission and pull s_snxt back
861: * to (closed) window. We will enter persist
862: * state below. If the widndow didn't close completely,
863: * just wait for an ACK.
864: */
865: len = 0;
866: if (win == 0) {
867: cb->s_timer[SPPT_REXMT] = 0;
868: cb->s_snxt = cb->s_rack;
869: }
870: }
871: if (len > 1)
872: sendalot = 1;
873: rcv_win = sbspace(&so->so_rcv);
874:
875: /*
876: * Send if we owe peer an ACK.
877: */
878: if (cb->s_oobflags & SF_SOOB) {
879: /*
880: * must transmit this out of band packet
881: */
882: cb->s_oobflags &= ~ SF_SOOB;
883: sendalot = 1;
884: sppstat.spps_sndurg++;
885: goto found;
886: }
887: if (cb->s_flags & SF_ACKNOW)
888: goto send;
889: if (cb->s_state < TCPS_ESTABLISHED)
890: goto send;
891: /*
892: * Silly window can't happen in spp.
893: * Code from tcp deleted.
894: */
895: if (len)
896: goto send;
897: /*
898: * Compare available window to amount of window
899: * known to peer (as advertised window less
900: * next expected input.) If the difference is at least two
901: * packets or at least 35% of the mximum possible window,
902: * then want to send a window update to peer.
903: */
904: if (rcv_win > 0) {
905: u_short delta = 1 + cb->s_alo - cb->s_ack;
906: int adv = rcv_win - (delta * cb->s_mtu);
907:
908: if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) ||
909: (100 * adv / so->so_rcv.sb_hiwat >= 35)) {
910: sppstat.spps_sndwinup++;
911: cb->s_flags |= SF_ACKNOW;
912: goto send;
913: }
914:
915: }
916: /*
917: * Many comments from tcp_output.c are appropriate here
918: * including . . .
919: * If send window is too small, there is data to transmit, and no
920: * retransmit or persist is pending, then go to persist state.
921: * If nothing happens soon, send when timer expires:
922: * if window is nonzero, transmit what we can,
923: * otherwise send a probe.
924: */
925: if (so->so_snd.sb_cc && cb->s_timer[SPPT_REXMT] == 0 &&
926: cb->s_timer[SPPT_PERSIST] == 0) {
927: cb->s_rxtshift = 0;
928: spp_setpersist(cb);
929: }
930: /*
931: * No reason to send a packet, just return.
932: */
933: cb->s_outx = 1;
934: return (0);
935:
936: send:
937: /*
938: * Find requested packet.
939: */
940: si = 0;
941: if (len > 0) {
942: cb->s_want = cb->s_snxt;
943: for (m = sb->sb_mb; m; m = m->m_act) {
944: si = mtod(m, struct spidp *);
945: if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
946: break;
947: }
948: found:
949: if (si) {
950: if (si->si_seq == cb->s_snxt)
951: cb->s_snxt++;
952: else
953: sppstat.spps_sndvoid++, si = 0;
954: }
955: }
956: /*
957: * update window
958: */
959: if (rcv_win < 0)
960: rcv_win = 0;
961: alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu));
962: if (SSEQ_LT(alo, cb->s_alo))
963: alo = cb->s_alo;
964:
965: if (si) {
966: /*
967: * must make a copy of this packet for
968: * idp_output to monkey with
969: */
970: m = m_copy(dtom(si), 0, (int)M_COPYALL);
971: if (m == NULL) {
972: return (ENOBUFS);
973: }
974: si = mtod(m, struct spidp *);
975: if (SSEQ_LT(si->si_seq, cb->s_smax))
976: sppstat.spps_sndrexmitpack++;
977: else
978: sppstat.spps_sndpack++;
979: } else if (cb->s_force || cb->s_flags & SF_ACKNOW) {
980: /*
981: * Must send an acknowledgement or a probe
982: */
983: if (cb->s_force)
984: sppstat.spps_sndprobe++;
985: if (cb->s_flags & SF_ACKNOW)
986: sppstat.spps_sndacks++;
987: m = m_gethdr(M_DONTWAIT, MT_HEADER);
988: if (m == 0)
989: return (ENOBUFS);
990: /*
991: * Fill in mbuf with extended SP header
992: * and addresses and length put into network format.
993: */
994: MH_ALIGN(m, sizeof (struct spidp));
995: m->m_len = sizeof (*si);
996: m->m_pkthdr.len = sizeof (*si);
997: si = mtod(m, struct spidp *);
998: si->si_i = *cb->s_idp;
999: si->si_s = cb->s_shdr;
1000: si->si_seq = cb->s_smax + 1;
1001: si->si_len = htons(sizeof (*si));
1002: si->si_cc |= SP_SP;
1003: } else {
1004: cb->s_outx = 3;
1005: if (so->so_options & SO_DEBUG || traceallspps)
1006: spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1007: return (0);
1008: }
1009: /*
1010: * Stuff checksum and output datagram.
1011: */
1012: if ((si->si_cc & SP_SP) == 0) {
1013: if (cb->s_force != (1 + SPPT_PERSIST) ||
1014: cb->s_timer[SPPT_PERSIST] == 0) {
1015: /*
1016: * If this is a new packet and we are not currently
1017: * timing anything, time this one.
1018: */
1019: if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1020: cb->s_smax = si->si_seq;
1021: if (cb->s_rtt == 0) {
1022: sppstat.spps_segstimed++;
1023: cb->s_rtseq = si->si_seq;
1024: cb->s_rtt = 1;
1025: }
1026: }
1027: /*
1028: * Set rexmt timer if not currently set,
1029: * Initial value for retransmit timer is smoothed
1030: * round-trip time + 2 * round-trip time variance.
1031: * Initialize shift counter which is used for backoff
1032: * of retransmit time.
1033: */
1034: if (cb->s_timer[SPPT_REXMT] == 0 &&
1035: cb->s_snxt != cb->s_rack) {
1036: cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
1037: if (cb->s_timer[SPPT_PERSIST]) {
1038: cb->s_timer[SPPT_PERSIST] = 0;
1039: cb->s_rxtshift = 0;
1040: }
1041: }
1042: } else if (SSEQ_LT(cb->s_smax, si->si_seq)) {
1043: cb->s_smax = si->si_seq;
1044: }
1045: } else if (cb->s_state < TCPS_ESTABLISHED) {
1046: if (cb->s_rtt == 0)
1047: cb->s_rtt = 1; /* Time initial handshake */
1048: if (cb->s_timer[SPPT_REXMT] == 0)
1049: cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
1050: }
1051: {
1052: /*
1053: * Do not request acks when we ack their data packets or
1054: * when we do a gratuitous window update.
1055: */
1056: if (((si->si_cc & SP_SP) == 0) || cb->s_force)
1057: si->si_cc |= SP_SA;
1058: si->si_seq = htons(si->si_seq);
1059: si->si_alo = htons(alo);
1060: si->si_ack = htons(cb->s_ack);
1061:
1062: if (idpcksum) {
1063: si->si_sum = 0;
1064: len = ntohs(si->si_len);
1065: if (len & 1)
1066: len++;
1067: si->si_sum = ns_cksum(m, len);
1068: } else
1069: si->si_sum = 0xffff;
1070:
1071: cb->s_outx = 4;
1072: if (so->so_options & SO_DEBUG || traceallspps)
1073: spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
1074:
1075: if (so->so_options & SO_DONTROUTE)
1076: error = ns_output(m, (struct route *)0, NS_ROUTETOIF);
1077: else
1078: error = ns_output(m, &cb->s_nspcb->nsp_route, 0);
1079: }
1080: if (error) {
1081: return (error);
1082: }
1083: sppstat.spps_sndtotal++;
1084: /*
1085: * Data sent (as far as we can tell).
1086: * If this advertises a larger window than any other segment,
1087: * then remember the size of the advertized window.
1088: * Any pending ACK has now been sent.
1089: */
1090: cb->s_force = 0;
1091: cb->s_flags &= ~(SF_ACKNOW|SF_DELACK);
1092: if (SSEQ_GT(alo, cb->s_alo))
1093: cb->s_alo = alo;
1094: if (sendalot)
1095: goto again;
1096: cb->s_outx = 5;
1097: return (0);
1098: }
1099:
1100: int spp_do_persist_panics = 0;
1101:
1102: spp_setpersist(cb)
1103: register struct sppcb *cb;
1104: {
1105: register t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1106: extern int spp_backoff[];
1107:
1108: if (cb->s_timer[SPPT_REXMT] && spp_do_persist_panics)
1109: panic("spp_output REXMT");
1110: /*
1111: * Start/restart persistance timer.
1112: */
1113: SPPT_RANGESET(cb->s_timer[SPPT_PERSIST],
1114: t*spp_backoff[cb->s_rxtshift],
1115: SPPTV_PERSMIN, SPPTV_PERSMAX);
1116: if (cb->s_rxtshift < SPP_MAXRXTSHIFT)
1117: cb->s_rxtshift++;
1118: }
1119: /*ARGSUSED*/
1120: spp_ctloutput(req, so, level, name, value)
1121: int req;
1122: struct socket *so;
1123: int name;
1124: struct mbuf **value;
1125: {
1126: register struct mbuf *m;
1127: struct nspcb *nsp = sotonspcb(so);
1128: register struct sppcb *cb;
1129: int mask, error = 0;
1130:
1131: if (level != NSPROTO_SPP) {
1132: /* This will have to be changed when we do more general
1133: stacking of protocols */
1134: return (idp_ctloutput(req, so, level, name, value));
1135: }
1136: if (nsp == NULL) {
1137: error = EINVAL;
1138: goto release;
1139: } else
1140: cb = nstosppcb(nsp);
1141:
1142: switch (req) {
1143:
1144: case PRCO_GETOPT:
1145: if (value == NULL)
1146: return (EINVAL);
1147: m = m_get(M_DONTWAIT, MT_DATA);
1148: if (m == NULL)
1149: return (ENOBUFS);
1150: switch (name) {
1151:
1152: case SO_HEADERS_ON_INPUT:
1153: mask = SF_HI;
1154: goto get_flags;
1155:
1156: case SO_HEADERS_ON_OUTPUT:
1157: mask = SF_HO;
1158: get_flags:
1159: m->m_len = sizeof(short);
1160: *mtod(m, short *) = cb->s_flags & mask;
1161: break;
1162:
1163: case SO_MTU:
1164: m->m_len = sizeof(u_short);
1165: *mtod(m, short *) = cb->s_mtu;
1166: break;
1167:
1168: case SO_LAST_HEADER:
1169: m->m_len = sizeof(struct sphdr);
1170: *mtod(m, struct sphdr *) = cb->s_rhdr;
1171: break;
1172:
1173: case SO_DEFAULT_HEADERS:
1174: m->m_len = sizeof(struct spidp);
1175: *mtod(m, struct sphdr *) = cb->s_shdr;
1176: break;
1177:
1178: default:
1179: error = EINVAL;
1180: }
1181: *value = m;
1182: break;
1183:
1184: case PRCO_SETOPT:
1185: if (value == 0 || *value == 0) {
1186: error = EINVAL;
1187: break;
1188: }
1189: switch (name) {
1190: int *ok;
1191:
1192: case SO_HEADERS_ON_INPUT:
1193: mask = SF_HI;
1194: goto set_head;
1195:
1196: case SO_HEADERS_ON_OUTPUT:
1197: mask = SF_HO;
1198: set_head:
1199: if (cb->s_flags & SF_PI) {
1200: ok = mtod(*value, int *);
1201: if (*ok)
1202: cb->s_flags |= mask;
1203: else
1204: cb->s_flags &= ~mask;
1205: } else error = EINVAL;
1206: break;
1207:
1208: case SO_MTU:
1209: cb->s_mtu = *(mtod(*value, u_short *));
1210: break;
1211:
1212: #ifdef SF_NEWCALL
1213: case SO_NEWCALL:
1214: ok = mtod(*value, int *);
1215: if (*ok) {
1216: cb->s_flags2 |= SF_NEWCALL;
1217: spp_newchecks[5]++;
1218: } else {
1219: cb->s_flags2 &= ~SF_NEWCALL;
1220: spp_newchecks[6]++;
1221: }
1222: break;
1223: #endif
1224:
1225: case SO_DEFAULT_HEADERS:
1226: {
1227: register struct sphdr *sp
1228: = mtod(*value, struct sphdr *);
1229: cb->s_dt = sp->sp_dt;
1230: cb->s_cc = sp->sp_cc & SP_EM;
1231: }
1232: break;
1233:
1234: default:
1235: error = EINVAL;
1236: }
1237: m_freem(*value);
1238: break;
1239: }
1240: release:
1241: return (error);
1242: }
1243:
1244: /*ARGSUSED*/
1245: spp_usrreq(so, req, m, nam, controlp)
1246: struct socket *so;
1247: int req;
1248: struct mbuf *m, *nam, *controlp;
1249: {
1250: struct nspcb *nsp = sotonspcb(so);
1251: register struct sppcb *cb;
1252: int s = splnet();
1253: int error = 0, ostate;
1254: struct mbuf *mm;
1255: register struct sockbuf *sb;
1256:
1257: if (req == PRU_CONTROL)
1258: return (ns_control(so, (int)m, (caddr_t)nam,
1259: (struct ifnet *)controlp));
1260: if (nsp == NULL) {
1261: if (req != PRU_ATTACH) {
1262: error = EINVAL;
1263: goto release;
1264: }
1265: } else
1266: cb = nstosppcb(nsp);
1267:
1268: ostate = cb ? cb->s_state : 0;
1269:
1270: switch (req) {
1271:
1272: case PRU_ATTACH:
1273: if (nsp != NULL) {
1274: error = EISCONN;
1275: break;
1276: }
1277: error = ns_pcballoc(so, &nspcb);
1278: if (error)
1279: break;
1280: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1281: error = soreserve(so, (u_long) 3072, (u_long) 3072);
1282: if (error)
1283: break;
1284: }
1285: nsp = sotonspcb(so);
1286:
1287: mm = m_getclr(M_DONTWAIT, MT_PCB);
1288: sb = &so->so_snd;
1289:
1290: if (mm == NULL) {
1291: error = ENOBUFS;
1292: break;
1293: }
1294: cb = mtod(mm, struct sppcb *);
1295: mm = m_getclr(M_DONTWAIT, MT_HEADER);
1296: if (mm == NULL) {
1297: (void) m_free(dtom(m));
1298: error = ENOBUFS;
1299: break;
1300: }
1301: cb->s_idp = mtod(mm, struct idp *);
1302: cb->s_state = TCPS_LISTEN;
1303: cb->s_smax = -1;
1304: cb->s_swl1 = -1;
1305: cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q;
1306: cb->s_nspcb = nsp;
1307: cb->s_mtu = 576 - sizeof (struct spidp);
1308: cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu;
1309: cb->s_ssthresh = cb->s_cwnd;
1310: cb->s_cwmx = sbspace(sb) * CUNIT /
1311: (2 * sizeof (struct spidp));
1312: /* Above is recomputed when connecting to account
1313: for changed buffering or mtu's */
1314: cb->s_rtt = SPPTV_SRTTBASE;
1315: cb->s_rttvar = SPPTV_SRTTDFLT << 2;
1316: SPPT_RANGESET(cb->s_rxtcur,
1317: ((SPPTV_SRTTBASE >> 2) + (SPPTV_SRTTDFLT << 2)) >> 1,
1318: SPPTV_MIN, SPPTV_REXMTMAX);
1319: nsp->nsp_pcb = (caddr_t) cb;
1320: break;
1321:
1322: case PRU_DETACH:
1323: if (nsp == NULL) {
1324: error = ENOTCONN;
1325: break;
1326: }
1327: if (cb->s_state > TCPS_LISTEN)
1328: cb = spp_disconnect(cb);
1329: else
1330: cb = spp_close(cb);
1331: break;
1332:
1333: case PRU_BIND:
1334: error = ns_pcbbind(nsp, nam);
1335: break;
1336:
1337: case PRU_LISTEN:
1338: if (nsp->nsp_lport == 0)
1339: error = ns_pcbbind(nsp, (struct mbuf *)0);
1340: if (error == 0)
1341: cb->s_state = TCPS_LISTEN;
1342: break;
1343:
1344: /*
1345: * Initiate connection to peer.
1346: * Enter SYN_SENT state, and mark socket as connecting.
1347: * Start keep-alive timer, setup prototype header,
1348: * Send initial system packet requesting connection.
1349: */
1350: case PRU_CONNECT:
1351: if (nsp->nsp_lport == 0) {
1352: error = ns_pcbbind(nsp, (struct mbuf *)0);
1353: if (error)
1354: break;
1355: }
1356: error = ns_pcbconnect(nsp, nam);
1357: if (error)
1358: break;
1359: soisconnecting(so);
1360: sppstat.spps_connattempt++;
1361: cb->s_state = TCPS_SYN_SENT;
1362: cb->s_did = 0;
1363: spp_template(cb);
1364: cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
1365: cb->s_force = 1 + SPPTV_KEEP;
1366: /*
1367: * Other party is required to respond to
1368: * the port I send from, but he is not
1369: * required to answer from where I am sending to,
1370: * so allow wildcarding.
1371: * original port I am sending to is still saved in
1372: * cb->s_dport.
1373: */
1374: nsp->nsp_fport = 0;
1375: error = spp_output(cb, (struct mbuf *) 0);
1376: break;
1377:
1378: case PRU_CONNECT2:
1379: error = EOPNOTSUPP;
1380: break;
1381:
1382: /*
1383: * We may decide later to implement connection closing
1384: * handshaking at the spp level optionally.
1385: * here is the hook to do it:
1386: */
1387: case PRU_DISCONNECT:
1388: cb = spp_disconnect(cb);
1389: break;
1390:
1391: /*
1392: * Accept a connection. Essentially all the work is
1393: * done at higher levels; just return the address
1394: * of the peer, storing through addr.
1395: */
1396: case PRU_ACCEPT: {
1397: struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
1398:
1399: nam->m_len = sizeof (struct sockaddr_ns);
1400: sns->sns_family = AF_NS;
1401: sns->sns_addr = nsp->nsp_faddr;
1402: break;
1403: }
1404:
1405: case PRU_SHUTDOWN:
1406: socantsendmore(so);
1407: cb = spp_usrclosed(cb);
1408: if (cb)
1409: error = spp_output(cb, (struct mbuf *) 0);
1410: break;
1411:
1412: /*
1413: * After a receive, possibly send acknowledgment
1414: * updating allocation.
1415: */
1416: case PRU_RCVD:
1417: cb->s_flags |= SF_RVD;
1418: (void) spp_output(cb, (struct mbuf *) 0);
1419: cb->s_flags &= ~SF_RVD;
1420: break;
1421:
1422: case PRU_ABORT:
1423: (void) spp_drop(cb, ECONNABORTED);
1424: break;
1425:
1426: case PRU_SENSE:
1427: case PRU_CONTROL:
1428: m = NULL;
1429: error = EOPNOTSUPP;
1430: break;
1431:
1432: case PRU_RCVOOB:
1433: if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
1434: (so->so_state & SS_RCVATMARK)) {
1435: m->m_len = 1;
1436: *mtod(m, caddr_t) = cb->s_iobc;
1437: break;
1438: }
1439: error = EINVAL;
1440: break;
1441:
1442: case PRU_SENDOOB:
1443: if (sbspace(&so->so_snd) < -512) {
1444: error = ENOBUFS;
1445: break;
1446: }
1447: cb->s_oobflags |= SF_SOOB;
1448: /* fall into */
1449: case PRU_SEND:
1450: if (controlp) {
1451: u_short *p = mtod(controlp, u_short *);
1452: spp_newchecks[2]++;
1453: if ((p[0] == 5) && p[1] == 1) { /* XXXX, for testing */
1454: cb->s_shdr.sp_dt = *(u_char *)(&p[2]);
1455: spp_newchecks[3]++;
1456: }
1457: m_freem(controlp);
1458: }
1459: controlp = NULL;
1460: error = spp_output(cb, m);
1461: m = NULL;
1462: break;
1463:
1464: case PRU_SOCKADDR:
1465: ns_setsockaddr(nsp, nam);
1466: break;
1467:
1468: case PRU_PEERADDR:
1469: ns_setpeeraddr(nsp, nam);
1470: break;
1471:
1472: case PRU_SLOWTIMO:
1473: cb = spp_timers(cb, (int)nam);
1474: req |= ((int)nam) << 8;
1475: break;
1476:
1477: case PRU_FASTTIMO:
1478: case PRU_PROTORCV:
1479: case PRU_PROTOSEND:
1480: error = EOPNOTSUPP;
1481: break;
1482:
1483: default:
1484: panic("sp_usrreq");
1485: }
1486: if (cb && (so->so_options & SO_DEBUG || traceallspps))
1487: spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req);
1488: release:
1489: if (controlp != NULL)
1490: m_freem(controlp);
1491: if (m != NULL)
1492: m_freem(m);
1493: splx(s);
1494: return (error);
1495: }
1496:
1497: spp_usrreq_sp(so, req, m, nam, controlp)
1498: struct socket *so;
1499: int req;
1500: struct mbuf *m, *nam, *controlp;
1501: {
1502: int error = spp_usrreq(so, req, m, nam, controlp);
1503:
1504: if (req == PRU_ATTACH && error == 0) {
1505: struct nspcb *nsp = sotonspcb(so);
1506: ((struct sppcb *)nsp->nsp_pcb)->s_flags |=
1507: (SF_HI | SF_HO | SF_PI);
1508: }
1509: return (error);
1510: }
1511:
1512: /*
1513: * Create template to be used to send spp packets on a connection.
1514: * Called after host entry created, fills
1515: * in a skeletal spp header (choosing connection id),
1516: * minimizing the amount of work necessary when the connection is used.
1517: */
1518: spp_template(cb)
1519: register struct sppcb *cb;
1520: {
1521: register struct nspcb *nsp = cb->s_nspcb;
1522: register struct idp *idp = cb->s_idp;
1523: register struct sockbuf *sb = &(nsp->nsp_socket->so_snd);
1524:
1525: idp->idp_pt = NSPROTO_SPP;
1526: idp->idp_sna = nsp->nsp_laddr;
1527: idp->idp_dna = nsp->nsp_faddr;
1528: cb->s_sid = htons(spp_iss);
1529: spp_iss += SPP_ISSINCR/2;
1530: cb->s_alo = 1;
1531: cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu;
1532: cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement
1533: of large packets */
1534: cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spidp));
1535: cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd);
1536: /* But allow for lots of little packets as well */
1537: }
1538:
1539: /*
1540: * Close a SPIP control block:
1541: * discard spp control block itself
1542: * discard ns protocol control block
1543: * wake up any sleepers
1544: */
1545: struct sppcb *
1546: spp_close(cb)
1547: register struct sppcb *cb;
1548: {
1549: register struct spidp_q *s;
1550: struct nspcb *nsp = cb->s_nspcb;
1551: struct socket *so = nsp->nsp_socket;
1552: register struct mbuf *m;
1553:
1554: s = cb->s_q.si_next;
1555: while (s != &(cb->s_q)) {
1556: s = s->si_next;
1557: m = dtom(s->si_prev);
1558: remque(s->si_prev);
1559: m_freem(m);
1560: }
1561: (void) m_free(dtom(cb->s_idp));
1562: (void) m_free(dtom(cb));
1563: nsp->nsp_pcb = 0;
1564: soisdisconnected(so);
1565: ns_pcbdetach(nsp);
1566: sppstat.spps_closed++;
1567: return ((struct sppcb *)0);
1568: }
1569: /*
1570: * Someday we may do level 3 handshaking
1571: * to close a connection or send a xerox style error.
1572: * For now, just close.
1573: */
1574: struct sppcb *
1575: spp_usrclosed(cb)
1576: register struct sppcb *cb;
1577: {
1578: return (spp_close(cb));
1579: }
1580: struct sppcb *
1581: spp_disconnect(cb)
1582: register struct sppcb *cb;
1583: {
1584: return (spp_close(cb));
1585: }
1586: /*
1587: * Drop connection, reporting
1588: * the specified error.
1589: */
1590: struct sppcb *
1591: spp_drop(cb, errno)
1592: register struct sppcb *cb;
1593: int errno;
1594: {
1595: struct socket *so = cb->s_nspcb->nsp_socket;
1596:
1597: /*
1598: * someday, in the xerox world
1599: * we will generate error protocol packets
1600: * announcing that the socket has gone away.
1601: */
1602: if (TCPS_HAVERCVDSYN(cb->s_state)) {
1603: sppstat.spps_drops++;
1604: cb->s_state = TCPS_CLOSED;
1605: /*(void) tcp_output(cb);*/
1606: } else
1607: sppstat.spps_conndrops++;
1608: so->so_error = errno;
1609: return (spp_close(cb));
1610: }
1611:
1612: spp_abort(nsp)
1613: struct nspcb *nsp;
1614: {
1615:
1616: (void) spp_close((struct sppcb *)nsp->nsp_pcb);
1617: }
1618:
1619: int spp_backoff[SPP_MAXRXTSHIFT+1] =
1620: { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
1621: /*
1622: * Fast timeout routine for processing delayed acks
1623: */
1624: spp_fasttimo()
1625: {
1626: register struct nspcb *nsp;
1627: register struct sppcb *cb;
1628: int s = splnet();
1629:
1630: nsp = nspcb.nsp_next;
1631: if (nsp)
1632: for (; nsp != &nspcb; nsp = nsp->nsp_next)
1633: if ((cb = (struct sppcb *)nsp->nsp_pcb) &&
1634: (cb->s_flags & SF_DELACK)) {
1635: cb->s_flags &= ~SF_DELACK;
1636: cb->s_flags |= SF_ACKNOW;
1637: sppstat.spps_delack++;
1638: (void) spp_output(cb, (struct mbuf *) 0);
1639: }
1640: splx(s);
1641: }
1642:
1643: /*
1644: * spp protocol timeout routine called every 500 ms.
1645: * Updates the timers in all active pcb's and
1646: * causes finite state machine actions if timers expire.
1647: */
1648: spp_slowtimo()
1649: {
1650: register struct nspcb *ip, *ipnxt;
1651: register struct sppcb *cb;
1652: int s = splnet();
1653: register int i;
1654:
1655: /*
1656: * Search through tcb's and update active timers.
1657: */
1658: ip = nspcb.nsp_next;
1659: if (ip == 0) {
1660: splx(s);
1661: return;
1662: }
1663: while (ip != &nspcb) {
1664: cb = nstosppcb(ip);
1665: ipnxt = ip->nsp_next;
1666: if (cb == 0)
1667: goto tpgone;
1668: for (i = 0; i < SPPT_NTIMERS; i++) {
1669: if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
1670: (void) spp_usrreq(cb->s_nspcb->nsp_socket,
1671: PRU_SLOWTIMO, (struct mbuf *)0,
1672: (struct mbuf *)i, (struct mbuf *)0,
1673: (struct mbuf *)0);
1674: if (ipnxt->nsp_prev != ip)
1675: goto tpgone;
1676: }
1677: }
1678: cb->s_idle++;
1679: if (cb->s_rtt)
1680: cb->s_rtt++;
1681: tpgone:
1682: ip = ipnxt;
1683: }
1684: spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */
1685: splx(s);
1686: }
1687: /*
1688: * SPP timer processing.
1689: */
1690: struct sppcb *
1691: spp_timers(cb, timer)
1692: register struct sppcb *cb;
1693: int timer;
1694: {
1695: long rexmt;
1696: int win;
1697:
1698: cb->s_force = 1 + timer;
1699: switch (timer) {
1700:
1701: /*
1702: * 2 MSL timeout in shutdown went off. TCP deletes connection
1703: * control block.
1704: */
1705: case SPPT_2MSL:
1706: printf("spp: SPPT_2MSL went off for no reason\n");
1707: cb->s_timer[timer] = 0;
1708: break;
1709:
1710: /*
1711: * Retransmission timer went off. Message has not
1712: * been acked within retransmit interval. Back off
1713: * to a longer retransmit interval and retransmit one packet.
1714: */
1715: case SPPT_REXMT:
1716: if (++cb->s_rxtshift > SPP_MAXRXTSHIFT) {
1717: cb->s_rxtshift = SPP_MAXRXTSHIFT;
1718: sppstat.spps_timeoutdrop++;
1719: cb = spp_drop(cb, ETIMEDOUT);
1720: break;
1721: }
1722: sppstat.spps_rexmttimeo++;
1723: rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
1724: rexmt *= spp_backoff[cb->s_rxtshift];
1725: SPPT_RANGESET(cb->s_rxtcur, rexmt, SPPTV_MIN, SPPTV_REXMTMAX);
1726: cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
1727: /*
1728: * If we have backed off fairly far, our srtt
1729: * estimate is probably bogus. Clobber it
1730: * so we'll take the next rtt measurement as our srtt;
1731: * move the current srtt into rttvar to keep the current
1732: * retransmit times until then.
1733: */
1734: if (cb->s_rxtshift > SPP_MAXRXTSHIFT / 4 ) {
1735: cb->s_rttvar += (cb->s_srtt >> 2);
1736: cb->s_srtt = 0;
1737: }
1738: cb->s_snxt = cb->s_rack;
1739: /*
1740: * If timing a packet, stop the timer.
1741: */
1742: cb->s_rtt = 0;
1743: /*
1744: * See very long discussion in tcp_timer.c about congestion
1745: * window and sstrhesh
1746: */
1747: win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2;
1748: if (win < 2)
1749: win = 2;
1750: cb->s_cwnd = CUNIT;
1751: cb->s_ssthresh = win * CUNIT;
1752: (void) spp_output(cb, (struct mbuf *) 0);
1753: break;
1754:
1755: /*
1756: * Persistance timer into zero window.
1757: * Force a probe to be sent.
1758: */
1759: case SPPT_PERSIST:
1760: sppstat.spps_persisttimeo++;
1761: spp_setpersist(cb);
1762: (void) spp_output(cb, (struct mbuf *) 0);
1763: break;
1764:
1765: /*
1766: * Keep-alive timer went off; send something
1767: * or drop connection if idle for too long.
1768: */
1769: case SPPT_KEEP:
1770: sppstat.spps_keeptimeo++;
1771: if (cb->s_state < TCPS_ESTABLISHED)
1772: goto dropit;
1773: if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) {
1774: if (cb->s_idle >= SPPTV_MAXIDLE)
1775: goto dropit;
1776: sppstat.spps_keepprobe++;
1777: (void) spp_output(cb, (struct mbuf *) 0);
1778: } else
1779: cb->s_idle = 0;
1780: cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
1781: break;
1782: dropit:
1783: sppstat.spps_keepdrops++;
1784: cb = spp_drop(cb, ETIMEDOUT);
1785: break;
1786: }
1787: return (cb);
1788: }
1789: #ifndef lint
1790: int SppcbSize = sizeof (struct sppcb);
1791: int NspcbSize = sizeof (struct nspcb);
1792: #endif lint
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