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1.1 root 1: /*
2: * Copyright (c) 1984, 1985, 1986 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: *
6: * @(#)spp_usrreq.c 7.1 (Berkeley) 6/5/86
7: */
8:
9: #include "param.h"
10: #include "dir.h"
11: #include "user.h"
12: #include "mbuf.h"
13: #include "protosw.h"
14: #include "socket.h"
15: #include "socketvar.h"
16: #include "errno.h"
17:
18: #include "../net/if.h"
19: #include "../net/route.h"
20: #include "../netinet/tcp_fsm.h"
21: #include "../netinet/tcp_timer.h"
22:
23: #include "ns.h"
24: #include "ns_pcb.h"
25: #include "idp.h"
26: #include "idp_var.h"
27: #include "ns_error.h"
28: #include "sp.h"
29: #include "spidp.h"
30: #include "spp_var.h"
31: #include "spp_debug.h"
32:
33: /*
34: * SP protocol implementation.
35: */
36: spp_init()
37: {
38:
39: spp_iss = 1; /* WRONG !! should fish it out of TODR */
40: }
41: struct spidp spp_savesi;
42: int traceallspps = 0;
43: extern int sppconsdebug;
44: int spp_hardnosed;
45: int spp_use_delack = 0;
46:
47: /*ARGSUSED*/
48: spp_input(m, nsp, ifp)
49: register struct mbuf *m;
50: register struct nspcb *nsp;
51: struct ifnet *ifp;
52: {
53: register struct sppcb *cb;
54: register struct spidp *si = mtod(m, struct spidp *);
55: register struct socket *so;
56: short ostate;
57: int dropsocket = 0;
58:
59:
60: if (nsp == 0) {
61: panic("No nspcb in spp_input\n");
62: return;
63: }
64:
65: cb = nstosppcb(nsp);
66: if (cb == 0) goto bad;
67:
68: if (m->m_len < sizeof(*si)) {
69: if ((m = m_pullup(m, sizeof(*si))) == 0) {
70: spp_istat.hdrops++;
71: return;
72: }
73: si = mtod(m, struct spidp *);
74: }
75: si->si_seq = ntohs(si->si_seq);
76: si->si_ack = ntohs(si->si_ack);
77: si->si_alo = ntohs(si->si_alo);
78:
79: so = nsp->nsp_socket;
80: if (so->so_options & SO_DEBUG || traceallspps) {
81: ostate = cb->s_state;
82: spp_savesi = *si;
83: }
84: if (so->so_options & SO_ACCEPTCONN) {
85: so = sonewconn(so);
86: if (so == 0) {
87: spp_istat.nonucn++;
88: goto drop;
89: }
90: /*
91: * This is ugly, but ....
92: *
93: * Mark socket as temporary until we're
94: * committed to keeping it. The code at
95: * ``drop'' and ``dropwithreset'' check the
96: * flag dropsocket to see if the temporary
97: * socket created here should be discarded.
98: * We mark the socket as discardable until
99: * we're committed to it below in TCPS_LISTEN.
100: */
101: dropsocket++;
102: nsp = (struct nspcb *)so->so_pcb;
103: nsp->nsp_laddr = si->si_dna;
104: cb = nstosppcb(nsp);
105: cb->s_state = TCPS_LISTEN;
106: }
107:
108: /*
109: * Packet received on connection.
110: * reset idle time and keep-alive timer;
111: */
112: cb->s_idle = 0;
113: cb->s_timer[TCPT_KEEP] = TCPTV_KEEP;
114:
115: switch (cb->s_state) {
116:
117: case TCPS_LISTEN:{
118: struct mbuf *am;
119: register struct sockaddr_ns *sns;
120: struct ns_addr laddr;
121:
122: /*
123: * If somebody here was carying on a conversation
124: * and went away, and his pen pal thinks he can
125: * still talk, we get the misdirected packet.
126: */
127: if (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
128: spp_istat.gonawy++;
129: goto dropwithreset;
130: }
131: am = m_get(M_DONTWAIT, MT_SONAME);
132: if (am == NULL)
133: goto drop;
134: am->m_len = sizeof (struct sockaddr_ns);
135: sns = mtod(am, struct sockaddr_ns *);
136: sns->sns_family = AF_NS;
137: sns->sns_addr = si->si_sna;
138: laddr = nsp->nsp_laddr;
139: if (ns_nullhost(laddr))
140: nsp->nsp_laddr = si->si_dna;
141: if (ns_pcbconnect(nsp, am)) {
142: nsp->nsp_laddr = laddr;
143: (void) m_free(am);
144: spp_istat.noconn++;
145: goto drop;
146: }
147: (void) m_free(am);
148: spp_template(cb);
149: dropsocket = 0; /* committed to socket */
150: cb->s_did = si->si_sid;
151: cb->s_rack = si->si_ack;
152: cb->s_ralo = si->si_alo;
153: #define THREEWAYSHAKE
154: #ifdef THREEWAYSHAKE
155: cb->s_state = TCPS_SYN_RECEIVED;
156: cb->s_force = 1 + TCPT_REXMT;
157: cb->s_timer[TCPT_REXMT] = 2 * TCPTV_MIN;
158: }
159: break;
160: /*
161: * This state means that we have heard a response
162: * to our acceptance of their connection
163: * It is probably logically unnecessary in this
164: * implementation.
165: */
166: case TCPS_SYN_RECEIVED:
167: if (si->si_did!=cb->s_sid) {
168: spp_istat.wrncon++;
169: goto drop;
170: }
171: #endif
172: nsp->nsp_fport = si->si_sport;
173: cb->s_timer[TCPT_REXMT] = 0;
174: cb->s_timer[TCPT_KEEP] = TCPTV_KEEP;
175: soisconnected(so);
176: cb->s_state = TCPS_ESTABLISHED;
177: break;
178:
179: /*
180: * This state means that we have gotten a response
181: * to our attempt to establish a connection.
182: * We fill in the data from the other side,
183: * telling us which port to respond to, instead of the well-
184: * known one we might have sent to in the first place.
185: * We also require that this is a response to our
186: * connection id.
187: */
188: case TCPS_SYN_SENT:
189: if (si->si_did!=cb->s_sid) {
190: spp_istat.notme++;
191: goto drop;
192: }
193: cb->s_did = si->si_sid;
194: cb->s_rack = si->si_ack;
195: cb->s_ralo = si->si_alo;
196: cb->s_dport = nsp->nsp_fport = si->si_sport;
197: cb->s_timer[TCPT_REXMT] = 0;
198: cb->s_flags |= SF_AK;
199: soisconnected(so);
200: cb->s_state = TCPS_ESTABLISHED;
201: }
202: if (so->so_options & SO_DEBUG || traceallspps)
203: spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0);
204:
205: m->m_len -= sizeof (struct idp);
206: m->m_off += sizeof (struct idp);
207:
208: if (spp_reass(cb, si)) {
209: m_freem(m);
210: }
211: (void) spp_output(cb, (struct mbuf *)0);
212: return;
213:
214: dropwithreset:
215: if (dropsocket)
216: (void) soabort(so);
217: si->si_seq = ntohs(si->si_seq);
218: si->si_ack = ntohs(si->si_ack);
219: si->si_alo = ntohs(si->si_alo);
220: ns_error(dtom(si), NS_ERR_NOSOCK, 0);
221: if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps)
222: spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
223: return;
224:
225: drop:
226: bad:
227: if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps)
228: spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
229: m_freem(m);
230: }
231:
232: /*
233: * This is structurally similar to the tcp reassembly routine
234: * but its function is somewhat different: It merely queues
235: * packets up, and suppresses duplicates.
236: */
237: spp_reass(cb, si)
238: register struct sppcb *cb;
239: register struct spidp *si;
240: {
241: register struct spidp_q *q;
242: register struct mbuf *m;
243: struct socket *so = cb->s_nspcb->nsp_socket;
244: struct sockbuf *sb = & (so->so_rcv);
245: char packetp = cb->s_flags & SF_HI;
246: char wakeup = 0;
247:
248:
249: if (si == SI(0))
250: goto present;
251: /*
252: * Update our news from them.
253: */
254: if (si->si_cc & SP_SA)
255: cb->s_flags |= (spp_use_delack ? SF_DELACK : SF_AK);
256: if (SSEQ_GT(si->si_ack, cb->s_rack)) {
257: cb->s_rack = si->si_ack;
258: /*
259: * If there are other packets outstanding,
260: * restart the timer for them.
261: */
262: if (SSEQ_GEQ(cb->s_snt, si->si_ack)) {
263: TCPT_RANGESET(cb->s_timer[TCPT_REXMT],
264: tcp_beta * cb->s_srtt, TCPTV_MIN,
265: TCPTV_MAX);
266: cb->s_rxtshift = 0;
267: } else
268: cb->s_timer[TCPT_REXMT] = 0;
269: /*
270: * If transmit timer is running and timed sequence
271: * number was acked, update smoothed round trip time.
272: */
273: if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) {
274: if (cb->s_srtt == 0)
275: cb->s_srtt = cb->s_rtt;
276: else
277: cb->s_srtt =
278: tcp_alpha * cb->s_srtt +
279: (1 - tcp_alpha) * cb->s_rtt;
280: cb->s_rtt = 0;
281: }
282: }
283: if (SSEQ_GT(si->si_alo, cb->s_ralo)) {
284: cb->s_ralo = si->si_alo;
285: cb->s_timer[TCPT_PERSIST] = 0;
286: }
287: /*
288: * If this is a system packet, we don't need to
289: * queue it up, and won't update acknowledge #
290: */
291: if (si->si_cc & SP_SP) {
292: m_freem(dtom(si));
293: return (0);
294: }
295:
296: /*
297: * If this packet number has a sequence number less
298: * than that of the first packet not yet seen coming
299: * from them, this must be a duplicate, so drop.
300: */
301: if (SSEQ_LT(si->si_seq, cb->s_ack)) {
302: spp_istat.bdreas++;
303: if (si->si_seq == cb->s_ack-1)
304: spp_istat.lstdup++;
305: return (1);
306: }
307: /*
308: * If this packet number is higher than that which
309: * we have allocated refuse it, unless urgent
310: */
311: if (SSEQ_GT(si->si_seq, cb->s_alo)) {
312: if (si->si_cc & SP_OB) {
313: if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
314: ns_error(dtom(si), NS_ERR_FULLUP, 0);
315: return (0);
316: } /* else queue this packet; */
317: } else {
318: spp_istat.notyet++;
319: return (1);
320: }
321: }
322:
323: /*
324: * Loop through all packets queued up to insert in
325: * appropriate sequence.
326: */
327:
328: for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) {
329: if (si->si_seq == SI(q)->si_seq) return (1); /*duplicate */
330: if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) break;
331: }
332: insque(si, q->si_prev);
333: /*
334: * If this packet is urgent, inform process
335: */
336: if (si->si_cc & SP_OB) {
337: cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
338: sohasoutofband(so);
339: cb->s_oobflags |= SF_IOOB;
340: }
341: present:
342: #define SPINC sizeof(struct sphdr)
343: /*
344: * Loop through all packets queued up to update acknowledge
345: * number, and present all acknowledged data to user;
346: * If in packet interface mode, show packet headers.
347: */
348: for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) {
349: if (SI(q)->si_seq == cb->s_ack) {
350: cb->s_ack++;
351: m = dtom(q);
352: if (SI(q)->si_cc & SP_OB) {
353: cb->s_oobflags &= ~SF_IOOB;
354: if (sb->sb_cc)
355: so->so_oobmark = sb->sb_cc;
356: else
357: so->so_state |= SS_RCVATMARK;
358: }
359: q = q->si_prev;
360: remque(q->si_next);
361: wakeup = 1;
362: if (packetp) {
363: sbappendrecord(sb, m);
364: } else {
365: cb->s_rhdr = *mtod(m, struct sphdr *);
366: m->m_off += SPINC;
367: m->m_len -= SPINC;
368: sbappend(sb, m);
369: }
370: } else
371: break;
372: }
373: if (wakeup) sorwakeup(so);
374: return (0);
375: }
376:
377: spp_ctlinput(cmd, arg)
378: int cmd;
379: caddr_t arg;
380: {
381: struct ns_addr *na;
382: extern u_char nsctlerrmap[];
383: extern spp_abort();
384: extern struct nspcb *idp_drop();
385: struct ns_errp *errp;
386: struct nspcb *nsp;
387: struct sockaddr_ns *sns;
388: int type;
389:
390: if (cmd < 0 || cmd > PRC_NCMDS)
391: return;
392: type = NS_ERR_UNREACH_HOST;
393:
394: switch (cmd) {
395:
396: case PRC_ROUTEDEAD:
397: case PRC_QUENCH:
398: break;
399:
400: case PRC_IFDOWN:
401: case PRC_HOSTDEAD:
402: case PRC_HOSTUNREACH:
403: sns = (struct sockaddr_ns *)arg;
404: if (sns->sns_family != AF_NS)
405: return;
406: na = &sns->sns_addr;
407: break;
408:
409: default:
410: errp = (struct ns_errp *)arg;
411: na = &errp->ns_err_idp.idp_dna;
412: type = errp->ns_err_num;
413: type = ntohs((u_short)type);
414: }
415: switch (type) {
416:
417: case NS_ERR_UNREACH_HOST:
418: ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0);
419: break;
420:
421: case NS_ERR_TOO_BIG:
422: case NS_ERR_NOSOCK:
423: nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port,
424: NS_WILDCARD);
425: if (nsp) {
426: if(nsp->nsp_pcb)
427: (void) spp_drop((struct sppcb *)nsp->nsp_pcb,
428: (int)nsctlerrmap[cmd]);
429: else
430: (void) idp_drop(nsp, (int)nsctlerrmap[cmd]);
431: }
432: }
433: }
434:
435: #ifdef notdef
436: int
437: spp_fixmtu(nsp)
438: register struct nspcb *nsp;
439: {
440: register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb);
441: register struct mbuf *m;
442: register struct spidp *si;
443: struct ns_errp *ep;
444: struct sockbuf *sb;
445: int badseq, len;
446: struct mbuf *firstbad, *m0;
447:
448: if (cb) {
449: /*
450: * The notification that we have sent
451: * too much is bad news -- we will
452: * have to go through queued up so far
453: * splitting ones which are too big and
454: * reassigning sequence numbers and checksums.
455: * we should then retransmit all packets from
456: * one above the offending packet to the last one
457: * we had sent (or our allocation)
458: * then the offending one so that the any queued
459: * data at our destination will be discarded.
460: */
461: ep = (struct ns_errp *)nsp->nsp_notify_param;
462: sb = &nsp->nsp_socket->so_snd;
463: cb->s_mtu = ep->ns_err_param;
464: badseq = SI(&ep->ns_err_idp)->si_seq;
465: for (m = sb->sb_mb; m; m = m->m_act) {
466: si = mtod(m, struct spidp *);
467: if (si->si_seq == badseq)
468: break;
469: }
470: if (m == 0) return;
471: firstbad = m;
472: /*for (;;) {*/
473: /* calculate length */
474: for (m0 = m, len = 0; m ; m = m->m_next)
475: len += m->m_len;
476: if (len > cb->s_mtu) {
477: }
478: /* FINISH THIS
479: } */
480: }
481: }
482: #endif
483:
484: int spp_output_cnt = 0;
485:
486: spp_output(cb, m0)
487: register struct sppcb *cb;
488: struct mbuf *m0;
489: {
490: struct socket *so = cb->s_nspcb->nsp_socket;
491: register struct mbuf *m;
492: register struct spidp *si = (struct spidp *) 0;
493: register struct sockbuf *sb = &(so->so_snd);
494: register int len = 0;
495: int error = 0;
496: u_short lookfor = 0;
497: struct mbuf *mprev;
498: extern int idpcksum;
499:
500: if (m0) {
501: int mtu = cb->s_mtu;
502: int datalen;
503: /*
504: * Make sure that packet isn't too big.
505: */
506: for (m = m0; m ; m = m->m_next) {
507: mprev = m;
508: len += m->m_len;
509: }
510: datalen = (cb->s_flags & SF_HO) ?
511: len - sizeof (struct sphdr) : len;
512: if (datalen > mtu) {
513: if (cb->s_flags & SF_PI) {
514: m_freem(m0);
515: return (EMSGSIZE);
516: } else {
517: int off = 0;
518: int oldEM = cb->s_cc & SP_EM;
519:
520: cb->s_cc &= ~SP_EM;
521: while (len > mtu) {
522: m = m_copy(m0, off, mtu);
523: if (m == NULL) {
524: error = ENOBUFS;
525: goto bad_copy;
526: }
527: error = spp_output(cb, m);
528: if (error) {
529: bad_copy:
530: cb->s_cc |= oldEM;
531: m_freem(m0);
532: return(error);
533: }
534: m_adj(m0, mtu);
535: len -= mtu;
536: }
537: cb->s_cc |= oldEM;
538: }
539: }
540: /*
541: * Force length even, by adding a "garbage byte" if
542: * necessary.
543: */
544: if (len & 1) {
545: m = mprev;
546: if (m->m_len + m->m_off < MMAXOFF)
547: m->m_len++;
548: else {
549: struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
550:
551: if (m1 == 0) {
552: m_freem(m0);
553: return (ENOBUFS);
554: }
555: m1->m_len = 1;
556: m1->m_off = MMAXOFF - 1;
557: m->m_next = m1;
558: }
559: }
560: m = m_get(M_DONTWAIT, MT_HEADER);
561: if (m == 0) {
562: m_freem(m0);
563: return (ENOBUFS);
564: }
565: /*
566: * Fill in mbuf with extended SP header
567: * and addresses and length put into network format.
568: * Long align so prepended ip headers will work on Gould.
569: */
570: m->m_off = MMAXOFF - sizeof (struct spidp) - 2;
571: m->m_len = sizeof (struct spidp);
572: m->m_next = m0;
573: si = mtod(m, struct spidp *);
574: *si = cb->s_shdr;
575: if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
576: register struct sphdr *sh;
577: if (m0->m_len < sizeof (*sh)) {
578: if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
579: (void) m_free(m);
580: m_freem(m0);
581: return (EINVAL);
582: }
583: m->m_next = m0;
584: }
585: sh = mtod(m0, struct sphdr *);
586: si->si_dt = sh->sp_dt;
587: si->si_cc |= sh->sp_cc & SP_EM;
588: m0->m_len -= sizeof (*sh);
589: m0->m_off += sizeof (*sh);
590: len -= sizeof (*sh);
591: }
592: len += sizeof(*si);
593: if (cb->s_oobflags & SF_SOOB) {
594: /*
595: * Per jqj@cornell:
596: * make sure OB packets convey exactly 1 byte.
597: * If the packet is 1 byte or larger, we
598: * have already guaranted there to be at least
599: * one garbage byte for the checksum, and
600: * extra bytes shouldn't hurt!
601: */
602: if (len > sizeof(*si)) {
603: si->si_cc |= SP_OB;
604: len = (1 + sizeof(*si));
605: }
606: }
607: si->si_len = htons((u_short)len);
608: /*
609: * queue stuff up for output
610: */
611: sbappendrecord(sb, m);
612: cb->s_seq++;
613: }
614: /*
615: * update window
616: */
617: {
618: register struct sockbuf *sb2 = &so->so_rcv;
619: int credit = ((((int)sb2->sb_mbmax) - (int)sb2->sb_mbcnt) /
620: ((short)cb->s_mtu));
621: int alo = cb->s_ack + (credit > 0 ? credit : 0) - 1;
622:
623: if (cb->s_alo < alo) {
624: /* If the amount we are raising the window
625: is more than his remaining headroom, tell
626: him about it. In particular, if he is at
627: his limit, any amount at all will do! */
628: u_short raise = alo - cb->s_alo;
629: u_short headroom = 1 + cb->s_alo - cb->s_ack;
630:
631: if(SSEQ_LT(headroom, raise))
632: cb->s_flags |= SF_AK;
633: cb->s_alo = alo;
634: }
635: }
636:
637: if (cb->s_oobflags & SF_SOOB) {
638: /*
639: * must transmit this out of band packet
640: */
641: cb->s_oobflags &= ~ SF_SOOB;
642: } else {
643: /*
644: * Decide what to transmit:
645: * If it is time to retransmit a packet,
646: * send that.
647: * If we have a new packet, send that
648: * (So long as it is in our allocation)
649: * Otherwise, see if it time to bang on them
650: * to ask for our current allocation.
651: */
652: if (cb->s_force == (1+TCPT_REXMT)) {
653: lookfor = cb->s_rack;
654: } else if (SSEQ_LT(cb->s_snt, cb->s_ralo)) {
655: lookfor = cb->s_snt + 1;
656: } else if (SSEQ_LT(cb->s_ralo, cb->s_seq)) {
657: lookfor = 0;
658: if (cb->s_timer[TCPT_PERSIST] == 0) {
659: spp_setpersist(cb);
660: /* tcp has cb->s_rxtshift = 0; here */
661: }
662: }
663: m = sb->sb_mb;
664: while (m) {
665: si = mtod(m, struct spidp *);
666: m = m->m_act;
667: if (SSEQ_LT(si->si_seq, cb->s_rack)) {
668: if ((sb->sb_flags & SB_WAIT)
669: || so->so_snd.sb_sel)
670: sowwakeup(so);
671: sbdroprecord(sb);
672: si = 0;
673: continue;
674: }
675: if (SSEQ_LT(si->si_seq, lookfor))
676: continue;
677: break;
678: }
679: if (si && (si->si_seq != lookfor))
680: si = 0;
681: }
682: cb->s_want = lookfor;
683:
684: if (si) {
685: /*
686: * must make a copy of this packet for
687: * idp_output to monkey with
688: */
689: m = m_copy(dtom(si), 0, (int)M_COPYALL);
690: if (m == NULL)
691: return (ENOBUFS);
692: m0 = m;
693: si = mtod(m, struct spidp *);
694: } else if (cb->s_force || cb->s_flags & SF_AK) {
695: /*
696: * Must send an acknowledgement or a probe
697: */
698: m = m_get(M_DONTWAIT, MT_HEADER);
699: if (m == 0)
700: return (ENOBUFS);
701: /*
702: * Fill in mbuf with extended SP header
703: * and addresses and length put into network format.
704: */
705: m->m_off = MMAXOFF - sizeof (struct spidp);
706: m->m_len = sizeof (*si);
707: m->m_next = 0;
708: si = mtod(m, struct spidp *);
709: *si = cb->s_shdr;
710: si->si_seq = cb->s_snt + 1;
711: si->si_len = htons(sizeof (*si));
712: si->si_cc |= SP_SP;
713: }
714: /*
715: * Stuff checksum and output datagram.
716: */
717: if (si) {
718: if (cb->s_flags & (SF_AK|SF_DELACK))
719: cb->s_flags &= ~(SF_AK|SF_DELACK);
720: /*
721: * If we are almost out of allocation
722: * or one of the timers has gone off
723: * request an ack.
724: */
725: if (SSEQ_GEQ(cb->s_seq, cb->s_ralo))
726: si->si_cc |= SP_SA;
727: if (cb->s_force) {
728: si->si_cc |= SP_SA;
729: cb->s_force = 0;
730: }
731: /*
732: * If this is a new packet (and not a system packet),
733: * and we are not currently timing anything,
734: * time this one and ask for an ack.
735: */
736: if (SSEQ_LT(cb->s_snt, si->si_seq) && (!(si->si_cc & SP_SP))) {
737: cb->s_snt = si->si_seq;
738: if (cb->s_rtt == 0) {
739: cb->s_rtseq = si->si_seq;
740: cb->s_rtt = 1;
741: si->si_cc |= SP_SA;
742: }
743: /*
744: * If the retransmit timer has not been set
745: * and this is a real packet
746: * then start the retransmit timer
747: */
748: if (cb->s_timer[TCPT_REXMT] == 0) {
749: TCPT_RANGESET(cb->s_timer[TCPT_REXMT],
750: tcp_beta * cb->s_srtt, TCPTV_MIN,
751: TCPTV_MAX);
752: cb->s_rxtshift = 0;
753: }
754: }
755: si->si_seq = htons(si->si_seq);
756: si->si_alo = htons(cb->s_alo);
757: si->si_ack = htons(cb->s_ack);
758:
759: if (idpcksum) {
760: si->si_sum = 0;
761: len = ntohs(si->si_len);
762: if (len & 1)
763: len++;
764: si->si_sum = ns_cksum(dtom(si), len);
765: } else
766: si->si_sum = 0xffff;
767:
768: if (so->so_options & SO_DEBUG || traceallspps)
769: spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
770: spp_output_cnt++;
771: if (so->so_options & SO_DONTROUTE)
772: error = ns_output(m, (struct route *)0, NS_ROUTETOIF);
773: else
774: error = ns_output(m, &cb->s_nspcb->nsp_route, 0);
775: if (traceallspps && sppconsdebug) {
776: printf("spp_out: %x\n", error);
777: }
778: if (so->so_options & SO_DEBUG || traceallspps)
779: spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
780: }
781: return (error);
782: }
783:
784: /*ARGSUSED*/
785: spp_ctloutput(req, so, level, name, value)
786: int req;
787: struct socket *so;
788: int name;
789: struct mbuf **value;
790: {
791: register struct mbuf *m;
792: struct nspcb *nsp = sotonspcb(so);
793: register struct sppcb *cb;
794: int mask, error = 0;
795:
796: if (level != NSPROTO_SPP) {
797: /* This will have to be changed when we do more general
798: stacking of protocols */
799: return (idp_ctloutput(req, so, level, name, value));
800: }
801: if (nsp == NULL) {
802: error = EINVAL;
803: goto release;
804: } else
805: cb = nstosppcb(nsp);
806:
807: switch (req) {
808:
809: case PRCO_GETOPT:
810: if (value == NULL)
811: return (EINVAL);
812: m = m_get(M_DONTWAIT, MT_DATA);
813: if (m == NULL)
814: return (ENOBUFS);
815: switch (name) {
816:
817: case SO_HEADERS_ON_INPUT:
818: mask = SF_HI;
819: goto get_flags;
820:
821: case SO_HEADERS_ON_OUTPUT:
822: mask = SF_HO;
823: get_flags:
824: m->m_len = sizeof(short);
825: m->m_off = MMAXOFF - sizeof(short);
826: *mtod(m, short *) = cb->s_flags & mask;
827: break;
828:
829: case SO_MTU:
830: m->m_len = sizeof(u_short);
831: m->m_off = MMAXOFF - sizeof(short);
832: *mtod(m, short *) = cb->s_mtu;
833: break;
834:
835: case SO_LAST_HEADER:
836: m->m_len = sizeof(struct sphdr);
837: m->m_off = MMAXOFF - sizeof(struct sphdr);
838: *mtod(m, struct sphdr *) = cb->s_rhdr;
839: break;
840:
841: case SO_DEFAULT_HEADERS:
842: m->m_len = sizeof(struct spidp);
843: m->m_off = MMAXOFF - sizeof(struct sphdr);
844: *mtod(m, struct sphdr *) = cb->s_shdr.si_s;
845: break;
846:
847: default:
848: error = EINVAL;
849: }
850: *value = m;
851: break;
852:
853: case PRCO_SETOPT:
854: if (value == 0 || *value == 0) {
855: error = EINVAL;
856: break;
857: }
858: switch (name) {
859: int *ok;
860:
861: case SO_HEADERS_ON_INPUT:
862: mask = SF_HI;
863: goto set_head;
864:
865: case SO_HEADERS_ON_OUTPUT:
866: mask = SF_HO;
867: set_head:
868: if (cb->s_flags & SF_PI) {
869: ok = mtod(*value, int *);
870: if (*ok)
871: cb->s_flags |= mask;
872: else
873: cb->s_flags &= ~mask;
874: } else error = EINVAL;
875: break;
876:
877: case SO_MTU:
878: cb->s_mtu = *(mtod(*value, u_short *));
879: break;
880:
881: case SO_DEFAULT_HEADERS:
882: {
883: register struct sphdr *sp
884: = mtod(*value, struct sphdr *);
885: cb->s_dt = sp->sp_dt;
886: cb->s_cc = sp->sp_cc & SP_EM;
887: }
888: break;
889:
890: default:
891: error = EINVAL;
892: }
893: m_freem(*value);
894: break;
895: }
896: release:
897: return (error);
898: }
899:
900: /*ARGSUSED*/
901: spp_usrreq(so, req, m, nam, rights)
902: struct socket *so;
903: int req;
904: struct mbuf *m, *nam, *rights;
905: {
906: struct nspcb *nsp = sotonspcb(so);
907: register struct sppcb *cb;
908: int s = splnet();
909: int error = 0, ostate;
910:
911: if (req == PRU_CONTROL)
912: return (ns_control(so, (int)m, (caddr_t)nam,
913: (struct ifnet *)rights));
914: if (rights && rights->m_len) {
915: error = EINVAL;
916: goto release;
917: }
918: if (nsp == NULL) {
919: if (req != PRU_ATTACH) {
920: error = EINVAL;
921: goto release;
922: }
923: } else
924: cb = nstosppcb(nsp);
925:
926: ostate = cb ? cb->s_state : 0;
927:
928: switch (req) {
929:
930: case PRU_ATTACH:
931: if (nsp != NULL) {
932: error = EISCONN;
933: break;
934: }
935: error = ns_pcballoc(so, &nspcb);
936: if (error)
937: break;
938: error = soreserve(so, 2048, 2048);
939: if (error)
940: break;
941: nsp = sotonspcb(so);
942: {
943: struct mbuf *mm = m_getclr(M_DONTWAIT, MT_PCB);
944:
945: if (mm == NULL) {
946: error = ENOBUFS;
947: break;
948: }
949: cb = mtod(mm, struct sppcb *);
950: cb->s_state = TCPS_LISTEN;
951: cb->s_snt = -1;
952: cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q;
953: cb->s_nspcb = nsp;
954: nsp->nsp_pcb = (caddr_t) cb;
955: }
956: break;
957:
958: case PRU_DETACH:
959: if (nsp == NULL) {
960: error = ENOTCONN;
961: break;
962: }
963: if (cb->s_state > TCPS_LISTEN)
964: cb = spp_disconnect(cb);
965: else
966: cb = spp_close(cb);
967: break;
968:
969: case PRU_BIND:
970: error = ns_pcbbind(nsp, nam);
971: break;
972:
973: case PRU_LISTEN:
974: if (nsp->nsp_lport == 0)
975: error = ns_pcbbind(nsp, (struct mbuf *)0);
976: if (error == 0)
977: cb->s_state = TCPS_LISTEN;
978: break;
979:
980: /*
981: * Initiate connection to peer.
982: * Enter SYN_SENT state, and mark socket as connecting.
983: * Start keep-alive timer, setup prototype header,
984: * Send initial system packet requesting connection.
985: */
986: case PRU_CONNECT:
987: if (nsp->nsp_lport == 0) {
988: error = ns_pcbbind(nsp, (struct mbuf *)0);
989: if (error)
990: break;
991: }
992: error = ns_pcbconnect(nsp, nam);
993: if (error)
994: break;
995: soisconnecting(so);
996: cb->s_state = TCPS_SYN_SENT;
997: cb->s_did = 0;
998: spp_template(cb);
999: cb->s_timer[TCPT_KEEP] = TCPTV_KEEP;
1000: cb->s_force = 1 + TCPTV_KEEP;
1001: /*
1002: * Other party is required to respond to
1003: * the port I send from, but he is not
1004: * required to answer from where I am sending to,
1005: * so allow wildcarding.
1006: * original port I am sending to is still saved in
1007: * cb->s_dport.
1008: */
1009: nsp->nsp_fport = 0;
1010: error = spp_output(cb, (struct mbuf *) 0);
1011: break;
1012:
1013: case PRU_CONNECT2:
1014: error = EOPNOTSUPP;
1015: break;
1016:
1017: /*
1018: * We may decide later to implement connection closing
1019: * handshaking at the spp level optionally.
1020: * here is the hook to do it:
1021: */
1022: case PRU_DISCONNECT:
1023: cb = spp_disconnect(cb);
1024: break;
1025:
1026: /*
1027: * Accept a connection. Essentially all the work is
1028: * done at higher levels; just return the address
1029: * of the peer, storing through addr.
1030: */
1031: case PRU_ACCEPT: {
1032: struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
1033:
1034: nam->m_len = sizeof (struct sockaddr_ns);
1035: sns->sns_family = AF_NS;
1036: sns->sns_addr = nsp->nsp_faddr;
1037: break;
1038: }
1039:
1040: case PRU_SHUTDOWN:
1041: socantsendmore(so);
1042: cb = spp_usrclosed(cb);
1043: if (cb)
1044: error = spp_output(cb, (struct mbuf *) 0);
1045: break;
1046:
1047: /*
1048: * After a receive, possibly send acknowledgment
1049: * updating allocation.
1050: */
1051: case PRU_RCVD:
1052: (void) spp_output(cb, (struct mbuf *) 0);
1053: break;
1054:
1055: case PRU_ABORT:
1056: (void) spp_drop(cb, ECONNABORTED);
1057: break;
1058:
1059: case PRU_SENSE:
1060: case PRU_CONTROL:
1061: m = NULL;
1062: error = EOPNOTSUPP;
1063: break;
1064:
1065: case PRU_RCVOOB:
1066: if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
1067: (so->so_state & SS_RCVATMARK)) {
1068: m->m_len = 1;
1069: *mtod(m, caddr_t) = cb->s_iobc;
1070: break;
1071: }
1072: error = EINVAL;
1073: break;
1074:
1075: case PRU_SENDOOB:
1076: if (sbspace(&so->so_snd) < -512) {
1077: error = ENOBUFS;
1078: break;
1079: }
1080: cb->s_oobflags |= SF_SOOB;
1081: /* fall into */
1082: case PRU_SEND:
1083: error = spp_output(cb, m);
1084: m = NULL;
1085: break;
1086:
1087: case PRU_SOCKADDR:
1088: ns_setsockaddr(nsp, nam);
1089: break;
1090:
1091: case PRU_PEERADDR:
1092: ns_setpeeraddr(nsp, nam);
1093: break;
1094:
1095: case PRU_SLOWTIMO:
1096: cb = spp_timers(cb, (int)nam);
1097: break;
1098:
1099: case PRU_FASTTIMO:
1100: case PRU_PROTORCV:
1101: case PRU_PROTOSEND:
1102: error = EOPNOTSUPP;
1103: break;
1104:
1105: default:
1106: panic("sp_usrreq");
1107: }
1108: if (cb && (so->so_options & SO_DEBUG || traceallspps))
1109: spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req);
1110: release:
1111: if (m != NULL)
1112: m_freem(m);
1113: splx(s);
1114: return (error);
1115: }
1116:
1117: spp_usrreq_sp(so, req, m, nam, rights)
1118: struct socket *so;
1119: int req;
1120: struct mbuf *m, *nam, *rights;
1121: {
1122: int error = spp_usrreq(so, req, m, nam, rights);
1123:
1124: if (req == PRU_ATTACH && error == 0) {
1125: struct nspcb *nsp = sotonspcb(so);
1126: ((struct sppcb *)nsp->nsp_pcb)->s_flags |=
1127: (SF_HI | SF_HO | SF_PI);
1128: }
1129: return (error);
1130: }
1131:
1132: /*
1133: * Create template to be used to send spp packets on a connection.
1134: * Called after host entry created, fills
1135: * in a skeletal spp header (choosing connection id),
1136: * minimizing the amount of work necessary when the connection is used.
1137: */
1138: spp_template(cb)
1139: struct sppcb *cb;
1140: {
1141: register struct nspcb *nsp = cb->s_nspcb;
1142: register struct spidp *n = &(cb->s_shdr);
1143:
1144: cb->s_mtu = 576 - sizeof (struct spidp);
1145: n->si_pt = NSPROTO_SPP;
1146: n->si_sna = nsp->nsp_laddr;
1147: n->si_dna = nsp->nsp_faddr;
1148: n->si_sid = htons(spp_iss);
1149: spp_iss += SPP_ISSINCR/2;
1150: n->si_alo = 1;
1151: }
1152:
1153: /*
1154: * Close a SPIP control block:
1155: * discard spp control block itself
1156: * discard ns protocol control block
1157: * wake up any sleepers
1158: */
1159: struct sppcb *
1160: spp_close(cb)
1161: register struct sppcb *cb;
1162: {
1163: register struct spidp_q *s;
1164: struct nspcb *nsp = cb->s_nspcb;
1165: struct socket *so = nsp->nsp_socket;
1166: register struct mbuf *m;
1167:
1168: s = cb->s_q.si_next;
1169: while (s != &(cb->s_q)) {
1170: s = s->si_next;
1171: m = dtom(s->si_prev);
1172: remque(s->si_prev);
1173: m_freem(m);
1174: }
1175: (void) m_free(dtom(cb));
1176: nsp->nsp_pcb = 0;
1177: soisdisconnected(so);
1178: ns_pcbdetach(nsp);
1179: return ((struct sppcb *)0);
1180: }
1181: /*
1182: * Someday we may do level 3 handshaking
1183: * to close a connection or send a xerox style error.
1184: * For now, just close.
1185: */
1186: struct sppcb *
1187: spp_usrclosed(cb)
1188: register struct sppcb *cb;
1189: {
1190: return (spp_close(cb));
1191: }
1192: struct sppcb *
1193: spp_disconnect(cb)
1194: register struct sppcb *cb;
1195: {
1196: return (spp_close(cb));
1197: }
1198: /*
1199: * Drop connection, reporting
1200: * the specified error.
1201: */
1202: struct sppcb *
1203: spp_drop(cb, errno)
1204: register struct sppcb *cb;
1205: int errno;
1206: {
1207: struct socket *so = cb->s_nspcb->nsp_socket;
1208:
1209: /*
1210: * someday, in the xerox world
1211: * we will generate error protocol packets
1212: * announcing that the socket has gone away.
1213: */
1214: /*if (TCPS_HAVERCVDSYN(tp->t_state)) {
1215: tp->t_state = TCPS_CLOSED;
1216: (void) tcp_output(tp);
1217: }*/
1218: so->so_error = errno;
1219: return (spp_close(cb));
1220: }
1221:
1222: spp_abort(nsp)
1223: struct nspcb *nsp;
1224: {
1225:
1226: (void) spp_close((struct sppcb *)nsp->nsp_pcb);
1227: }
1228:
1229: spp_setpersist(cb)
1230: register struct sppcb *cb;
1231: {
1232:
1233: /*if (cb->s_timer[TCPT_REXMT])
1234: panic("spp_output REXMT");*/
1235: /*
1236: * Start/restart persistance timer.
1237: */
1238: TCPT_RANGESET(cb->s_timer[TCPT_PERSIST],
1239: ((int)(tcp_beta * cb->s_srtt)) << cb->s_rxtshift,
1240: TCPTV_PERSMIN, TCPTV_MAX);
1241: cb->s_rxtshift++;
1242: if (cb->s_rxtshift >= TCP_MAXRXTSHIFT)
1243: cb->s_rxtshift = 0;
1244: }
1245: /*
1246: * Fast timeout routine for processing delayed acks
1247: */
1248: int spp_ftcnt;
1249: spp_fasttimo()
1250: {
1251: register struct nspcb *nsp;
1252: register struct sppcb *cb;
1253: int s = splnet();
1254:
1255: nsp = nspcb.nsp_next;
1256: spp_ftcnt++;
1257: if (nsp)
1258: for (; nsp != &nspcb; nsp = nsp->nsp_next)
1259: if ((cb = (struct sppcb *)nsp->nsp_pcb) &&
1260: (cb->s_flags & SF_DELACK)) {
1261: cb->s_flags &= ~SF_DELACK;
1262: cb->s_flags |= SF_AK;
1263: (void) spp_output(cb, (struct mbuf *) 0);
1264: }
1265: splx(s);
1266: }
1267:
1268: /*
1269: * spp protocol timeout routine called every 500 ms.
1270: * Updates the timers in all active pcb's and
1271: * causes finite state machine actions if timers expire.
1272: */
1273: spp_slowtimo()
1274: {
1275: register struct nspcb *ip, *ipnxt;
1276: register struct sppcb *cb;
1277: int s = splnet();
1278: register int i;
1279:
1280: /*
1281: * Search through tcb's and update active timers.
1282: */
1283: ip = nspcb.nsp_next;
1284: if (ip == 0) {
1285: splx(s);
1286: return;
1287: }
1288: while (ip != &nspcb) {
1289: cb = nstosppcb(ip);
1290: ipnxt = ip->nsp_next;
1291: if (cb == 0)
1292: goto tpgone;
1293: for (i = 0; i < TCPT_NTIMERS; i++) {
1294: if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
1295: (void) spp_usrreq(cb->s_nspcb->nsp_socket,
1296: PRU_SLOWTIMO, (struct mbuf *)0,
1297: (struct mbuf *)i, (struct mbuf *)0);
1298: if (ipnxt->nsp_prev != ip)
1299: goto tpgone;
1300: }
1301: }
1302: cb->s_idle++;
1303: if (cb->s_rtt)
1304: cb->s_rtt++;
1305: tpgone:
1306: ip = ipnxt;
1307: }
1308: spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */
1309: splx(s);
1310: }
1311:
1312: float spp_backoff[TCP_MAXRXTSHIFT] =
1313: { 1.0, 1.2, 1.4, 1.7, 2.0, 3.0, 5.0, 8.0, 16.0, 32.0 };
1314: int sppexprexmtbackoff = 0;
1315: /*
1316: * SPP timer processing.
1317: */
1318: struct sppcb *
1319: spp_timers(cb, timer)
1320: register struct sppcb *cb;
1321: int timer;
1322: {
1323:
1324: cb->s_force = 1 + timer;
1325: switch (timer) {
1326:
1327: /*
1328: * 2 MSL timeout in shutdown went off. Delete connection
1329: * control block.
1330: */
1331: case TCPT_2MSL:
1332: cb = spp_close(cb);
1333: break;
1334:
1335: /*
1336: * Retransmission timer went off. Message has not
1337: * been acked within retransmit interval. Back off
1338: * to a longer retransmit interval and retransmit all
1339: * unacknowledged messages in the window.
1340: */
1341: case TCPT_REXMT:
1342: cb->s_rxtshift++;
1343: if (cb->s_rxtshift > TCP_MAXRXTSHIFT) {
1344: cb = spp_drop(cb, ETIMEDOUT);
1345: break;
1346: }
1347: (void) spp_output(cb, (struct mbuf *) 0);
1348: TCPT_RANGESET(cb->s_timer[TCPT_REXMT],
1349: (int)cb->s_srtt, TCPTV_MIN, TCPTV_MAX);
1350: if (sppexprexmtbackoff) {
1351: TCPT_RANGESET(cb->s_timer[TCPT_REXMT],
1352: cb->s_timer[TCPT_REXMT] << cb->s_rxtshift,
1353: TCPTV_MIN, TCPTV_MAX);
1354: } else {
1355: TCPT_RANGESET(cb->s_timer[TCPT_REXMT],
1356: cb->s_timer[TCPT_REXMT] *
1357: spp_backoff[cb->s_rxtshift - 1],
1358: TCPTV_MIN, TCPTV_MAX);
1359: }
1360: break;
1361:
1362: /*
1363: * Persistance timer into zero window.
1364: * Force a probe to be sent.
1365: */
1366: case TCPT_PERSIST:
1367: (void) spp_output(cb, (struct mbuf *) 0);
1368: spp_setpersist(cb);
1369: break;
1370:
1371: /*
1372: * Keep-alive timer went off; send something
1373: * or drop connection if idle for too long.
1374: */
1375: case TCPT_KEEP:
1376: if (cb->s_state < TCPS_ESTABLISHED)
1377: goto dropit;
1378: if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) {
1379: if (cb->s_idle >= TCPTV_MAXIDLE)
1380: goto dropit;
1381: (void) spp_output(cb, (struct mbuf *) 0);
1382: } else
1383: cb->s_idle = 0;
1384: cb->s_timer[TCPT_KEEP] = TCPTV_KEEP;
1385: break;
1386: dropit:
1387: cb = spp_drop(cb, ETIMEDOUT);
1388: break;
1389: }
1390: return (cb);
1391: }
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