Commit | Line | Data |
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8ae0e4b4 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
a5c5bc2d | 6 | * @(#)spp_usrreq.c 6.10 (Berkeley) %G% |
8ae0e4b4 | 7 | */ |
4258e601 KS |
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 | ||
45 | int spp_hardnosed; | |
e3c149da | 46 | spp_input(m, nsp) |
4258e601 | 47 | register struct mbuf *m; |
fe594349 | 48 | register struct nspcb *nsp; |
e3c149da | 49 | { |
4258e601 KS |
50 | register struct sppcb *cb; |
51 | register struct spidp *si = mtod(m, struct spidp *); | |
52 | register struct socket *so; | |
f97be0c9 | 53 | short ostate; |
4258e601 KS |
54 | int dropsocket = 0; |
55 | ||
56 | ||
99e0091e | 57 | if (nsp == 0) { |
e3c149da | 58 | panic("No nspcb in spp_input\n"); |
fe594349 KS |
59 | return; |
60 | } | |
4258e601 KS |
61 | |
62 | cb = nstosppcb(nsp); | |
63 | if (cb == 0) goto bad; | |
64 | ||
e3c149da | 65 | if (m->m_len < sizeof(*si)) { |
99e0091e | 66 | if ((m = m_pullup(m, sizeof(*si))) == 0) { |
e3c149da KS |
67 | spp_istat.hdrops++; |
68 | return; | |
69 | } | |
70 | si = mtod(m, struct spidp *); | |
71 | } | |
4258e601 KS |
72 | si->si_seq = ntohs(si->si_seq); |
73 | si->si_ack = ntohs(si->si_ack); | |
74 | si->si_alo = ntohs(si->si_alo); | |
75 | ||
76 | so = nsp->nsp_socket; | |
77 | if (so->so_options & SO_DEBUG || traceallspps) { | |
78 | ostate = cb->s_state; | |
79 | spp_savesi = *si; | |
80 | } | |
81 | if (so->so_options & SO_ACCEPTCONN) { | |
82 | so = sonewconn(so); | |
83 | if (so == 0) { | |
84 | spp_istat.nonucn++; | |
85 | goto drop; | |
86 | } | |
87 | /* | |
88 | * This is ugly, but .... | |
89 | * | |
90 | * Mark socket as temporary until we're | |
91 | * committed to keeping it. The code at | |
92 | * ``drop'' and ``dropwithreset'' check the | |
93 | * flag dropsocket to see if the temporary | |
94 | * socket created here should be discarded. | |
95 | * We mark the socket as discardable until | |
96 | * we're committed to it below in TCPS_LISTEN. | |
97 | */ | |
98 | dropsocket++; | |
99 | nsp = (struct nspcb *)so->so_pcb; | |
100 | nsp->nsp_laddr = si->si_dna; | |
101 | cb = nstosppcb(nsp); | |
102 | cb->s_state = TCPS_LISTEN; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Packet received on connection. | |
107 | * reset idle time and keep-alive timer; | |
108 | */ | |
109 | cb->s_idle = 0; | |
110 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
111 | ||
112 | switch (cb->s_state) { | |
9ad31c34 | 113 | |
4258e601 KS |
114 | case TCPS_LISTEN:{ |
115 | struct mbuf *am; | |
116 | register struct sockaddr_ns *sns; | |
117 | struct ns_addr laddr; | |
118 | ||
119 | /* | |
120 | * If somebody here was carying on a conversation | |
121 | * and went away, and his pen pal thinks he can | |
122 | * still talk, we get the misdirected packet. | |
123 | */ | |
124 | if (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) { | |
125 | spp_istat.gonawy++; | |
126 | goto dropwithreset; | |
127 | } | |
128 | am = m_get(M_DONTWAIT, MT_SONAME); | |
129 | if (am == NULL) | |
130 | goto drop; | |
131 | am->m_len = sizeof (struct sockaddr_ns); | |
132 | sns = mtod(am, struct sockaddr_ns *); | |
133 | sns->sns_family = AF_NS; | |
134 | sns->sns_addr = si->si_sna; | |
135 | laddr = nsp->nsp_laddr; | |
136 | if (ns_nullhost(laddr)) | |
137 | nsp->nsp_laddr = si->si_dna; | |
138 | if (ns_pcbconnect(nsp, am)) { | |
139 | nsp->nsp_laddr = laddr; | |
140 | (void) m_free(am); | |
141 | spp_istat.noconn++; | |
142 | goto drop; | |
143 | } | |
144 | (void) m_free(am); | |
145 | cb->s_state = TCPS_SYN_RECEIVED; | |
146 | spp_template(cb); | |
147 | cb->s_did = si->si_sid; | |
148 | cb->s_rack = si->si_ack; | |
149 | cb->s_ralo = si->si_alo; | |
150 | cb->s_flags |= SF_AK; | |
151 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
152 | dropsocket = 0; /* committed to socket */ | |
153 | } | |
154 | break; | |
155 | ||
156 | /* | |
157 | * This state means that we have gotten a response | |
158 | * to our attempt to establish a connection. | |
fe594349 KS |
159 | * We fill in the data from the other side, |
160 | * telling us which port to respond to, instead of the well- | |
161 | * known one we might have sent to in the first place. | |
4258e601 | 162 | * We also require that this is a response to our |
fe594349 | 163 | * connection id. |
4258e601 KS |
164 | */ |
165 | case TCPS_SYN_SENT: | |
166 | if (si->si_did!=cb->s_sid) { | |
167 | spp_istat.notme++; | |
168 | goto drop; | |
169 | } | |
170 | cb->s_did = si->si_sid; | |
171 | cb->s_rack = si->si_ack; | |
172 | cb->s_ralo = si->si_alo; | |
173 | cb->s_dport = nsp->nsp_fport = si->si_sport; | |
174 | cb->s_timer[TCPT_REXMT] = 0; | |
175 | cb->s_flags |= SF_AK; | |
176 | soisconnected(so); | |
177 | cb->s_state = TCPS_ESTABLISHED; | |
178 | break; | |
179 | /* | |
180 | * This state means that we have heard a response | |
181 | * to our acceptance of their connection | |
182 | * It is probably logically unnecessary in this | |
183 | * implementation. | |
184 | */ | |
185 | case TCPS_SYN_RECEIVED: | |
186 | if (si->si_did!=cb->s_sid) { | |
187 | spp_istat.wrncon++; | |
188 | goto drop; | |
189 | } | |
190 | nsp->nsp_fport = si->si_sport; | |
191 | cb->s_timer[TCPT_REXMT] = 0; | |
192 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
193 | soisconnected(so); | |
194 | cb->s_state = TCPS_ESTABLISHED; | |
195 | } | |
196 | if (so->so_options & SO_DEBUG || traceallspps) | |
f97be0c9 | 197 | spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
198 | |
199 | m->m_len -= sizeof (struct idp); | |
200 | m->m_off += sizeof (struct idp); | |
201 | ||
202 | if (spp_reass(cb,si)) { | |
4258e601 KS |
203 | goto drop; |
204 | } | |
f97be0c9 | 205 | (void) spp_output(cb,(struct mbuf *)0); |
4258e601 KS |
206 | return; |
207 | ||
208 | dropwithreset: | |
209 | if (dropsocket) | |
210 | (void) soabort(so); | |
211 | si->si_seq = ntohs(si->si_seq); | |
212 | si->si_ack = ntohs(si->si_ack); | |
213 | si->si_alo = ntohs(si->si_alo); | |
214 | ns_error(dtom(si), NS_ERR_NOSOCK, 0); | |
215 | if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps) | |
f97be0c9 | 216 | spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
217 | return; |
218 | ||
219 | drop: | |
220 | bad: | |
99e0091e | 221 | if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps) |
f97be0c9 | 222 | spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
223 | m_freem(m); |
224 | } | |
225 | ||
226 | /* | |
227 | * This is structurally similar to the tcp reassembly routine | |
228 | * but its function is somewhat different: It merely queues | |
229 | * packets up, and suppresses duplicates. | |
230 | */ | |
231 | spp_reass(cb,si) | |
232 | register struct sppcb *cb; | |
233 | register struct spidp *si; | |
234 | { | |
235 | register struct spidp_q *q; | |
236 | register struct mbuf *m; | |
237 | struct socket *so = cb->s_nspcb->nsp_socket; | |
238 | struct sockbuf *sb = & (so->so_rcv); | |
239 | char packetp = cb->s_flags & SF_HI; | |
240 | char wakeup = 0; | |
241 | ||
242 | ||
99e0091e | 243 | if (si == SI(0)) |
4258e601 KS |
244 | goto present; |
245 | /* | |
246 | * Update our news from them. | |
247 | */ | |
248 | if (si->si_cc & SP_SA) | |
249 | cb->s_flags |= SF_DELACK; | |
250 | if (SSEQ_GT(si->si_ack,cb->s_rack)) { | |
251 | cb->s_rack = si->si_ack; | |
252 | cb->s_timer[TCPT_REXMT] = 0; | |
253 | ||
254 | /* | |
255 | * If transmit timer is running and timed sequence | |
256 | * number was acked, update smoothed round trip time. | |
257 | */ | |
258 | if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) { | |
259 | if (cb->s_srtt == 0) | |
260 | cb->s_srtt = cb->s_rtt; | |
261 | else | |
262 | cb->s_srtt = | |
263 | tcp_alpha * cb->s_srtt + | |
264 | (1 - tcp_alpha) * cb->s_rtt; | |
265 | cb->s_rtt = 0; | |
266 | } | |
267 | } | |
268 | if (SSEQ_GT(si->si_alo,cb->s_ralo)) { | |
269 | cb->s_ralo = si->si_alo; | |
270 | cb->s_timer[TCPT_PERSIST] = 0; | |
271 | } | |
272 | /* | |
273 | * If this is a system packet, we don't need to | |
274 | * queue it up, and won't update acknowledge # | |
275 | */ | |
ca1bb209 KS |
276 | if (si->si_cc & SP_SP) { |
277 | m_freem(dtom(si)); | |
9ad31c34 | 278 | return (0); |
ca1bb209 | 279 | } |
4258e601 KS |
280 | |
281 | /* | |
282 | * If this packet number has a sequence number less | |
283 | * than that of the first packet not yet seen coming | |
284 | * from them, this must be a duplicate, so drop. | |
285 | */ | |
fe594349 KS |
286 | if (SSEQ_LT(si->si_seq,cb->s_ack)) { |
287 | spp_istat.bdreas++; | |
99e0091e | 288 | if (si->si_seq == cb->s_ack-1) |
fe594349 | 289 | spp_istat.lstdup++; |
9ad31c34 | 290 | return (1); |
fe594349 | 291 | } |
4258e601 KS |
292 | /* |
293 | * If this packet number is higher than that which | |
294 | * we have allocated refuse it, unless urgent | |
295 | */ | |
296 | if (SSEQ_GT(si->si_seq,cb->s_alo) && (!(si->si_cc & SP_OB))) { | |
fe594349 | 297 | spp_istat.notyet++; |
9ad31c34 | 298 | return (1); |
4258e601 KS |
299 | } |
300 | /* | |
301 | * If this packet is urgent, inform process | |
302 | */ | |
303 | if (si->si_cc & SP_OB) { | |
304 | cb->s_iobc = ((char *)si)[1 + sizeof(*si)]; | |
305 | sohasoutofband(so); | |
306 | } | |
307 | ||
308 | /* | |
309 | * Loop through all packets queued up to insert in | |
310 | * appropriate sequence. | |
311 | */ | |
312 | ||
313 | for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { | |
99e0091e | 314 | if (si->si_seq == SI(q)->si_seq) return (1); /*duplicate */ |
4258e601 KS |
315 | if (SSEQ_LT(si->si_seq,SI(q)->si_seq)) break; |
316 | } | |
317 | insque(si,q->si_prev); | |
318 | ||
319 | present: | |
320 | #define SPINC sizeof(struct sphdr) | |
321 | /* | |
322 | * Loop through all packets queued up to update acknowledge | |
323 | * number, and present all acknowledged data to user; | |
324 | * If in packet interface mode, show packet headers. | |
325 | */ | |
326 | for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { | |
99e0091e | 327 | if (SI(q)->si_seq == cb->s_ack) { |
4258e601 KS |
328 | cb->s_ack++; |
329 | m = dtom(q); | |
330 | if (SI(q)->si_cc & SP_OB) { | |
331 | if (sb->sb_cc) | |
332 | so->so_oobmark = sb->sb_cc; | |
333 | else | |
334 | so->so_state |= SS_RCVATMARK; | |
335 | } | |
336 | q = q->si_prev; | |
337 | remque(q->si_next); | |
338 | wakeup = 1; | |
339 | if (packetp) { | |
340 | sbappendrecord(sb,m); | |
341 | } else { | |
342 | cb->s_rhdr = *mtod(m, struct sphdr *); | |
343 | m->m_off += SPINC; | |
344 | m->m_len -= SPINC; | |
345 | sbappend(sb,m); | |
346 | } | |
347 | } else | |
348 | break; | |
349 | } | |
350 | if (wakeup) sorwakeup(so); | |
9ad31c34 | 351 | return (0); |
4258e601 KS |
352 | } |
353 | ||
354 | spp_ctlinput(cmd, arg) | |
355 | int cmd; | |
356 | caddr_t arg; | |
357 | { | |
358 | struct ns_addr *na; | |
359 | extern u_char nsctlerrmap[]; | |
360 | extern spp_abort(); | |
f97be0c9 | 361 | extern struct nspcb *idp_drop(); |
fe594349 KS |
362 | struct ns_errp *errp; |
363 | struct nspcb *nsp; | |
4258e601 KS |
364 | int type; |
365 | ||
366 | if (cmd < 0 || cmd > PRC_NCMDS) | |
367 | return; | |
368 | type = NS_ERR_UNREACH_HOST; | |
369 | ||
370 | switch (cmd) { | |
9ad31c34 | 371 | |
4258e601 KS |
372 | case PRC_ROUTEDEAD: |
373 | case PRC_QUENCH: | |
374 | break; | |
375 | ||
376 | case PRC_IFDOWN: | |
377 | na = &((struct sockaddr_ns *)arg)->sns_addr; | |
378 | break; | |
379 | ||
380 | case PRC_HOSTDEAD: | |
381 | case PRC_HOSTUNREACH: | |
382 | na = (struct ns_addr *)arg; | |
383 | break; | |
384 | ||
385 | default: | |
fe594349 KS |
386 | errp = (struct ns_errp *)arg; |
387 | na = &errp->ns_err_idp.idp_dna; | |
388 | type = errp->ns_err_num; | |
f97be0c9 | 389 | type = ntohs((u_short)type); |
4258e601 KS |
390 | } |
391 | switch (type) { | |
9ad31c34 | 392 | |
4258e601 | 393 | case NS_ERR_UNREACH_HOST: |
fe594349 | 394 | ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0); |
4258e601 | 395 | break; |
9ad31c34 | 396 | |
4258e601 | 397 | case NS_ERR_TOO_BIG: |
fe594349 KS |
398 | case NS_ERR_NOSOCK: |
399 | nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port, | |
400 | NS_WILDCARD); | |
401 | if (nsp) { | |
402 | if(nsp->nsp_pcb) | |
f97be0c9 KS |
403 | (void) spp_drop((struct sppcb *)nsp->nsp_pcb, |
404 | (int)nsctlerrmap[cmd]); | |
fe594349 | 405 | else |
f97be0c9 | 406 | (void) idp_drop(nsp, (int)nsctlerrmap[cmd]); |
fe594349 | 407 | } |
4258e601 KS |
408 | } |
409 | } | |
410 | ||
f97be0c9 | 411 | #ifdef notdef |
4258e601 KS |
412 | int |
413 | spp_fixmtu(nsp) | |
414 | register struct nspcb *nsp; | |
415 | { | |
416 | register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb); | |
417 | register struct mbuf *m; | |
418 | register struct spidp *si; | |
419 | struct ns_errp *ep; | |
420 | struct sockbuf *sb; | |
421 | int badseq, len; | |
422 | struct mbuf *firstbad, *m0; | |
423 | ||
424 | if (cb) { | |
425 | /* | |
426 | * The notification that we have sent | |
427 | * too much is bad news -- we will | |
428 | * have to go through queued up so far | |
429 | * splitting ones which are too big and | |
430 | * reassigning sequence numbers and checksums. | |
431 | * we should then retransmit all packets from | |
432 | * one above the offending packet to the last one | |
433 | * we had sent (or our allocation) | |
434 | * then the offending one so that the any queued | |
435 | * data at our destination will be discarded. | |
436 | */ | |
437 | ep = (struct ns_errp *)nsp->nsp_notify_param; | |
438 | sb = &nsp->nsp_socket->so_snd; | |
439 | cb->s_mtu = ep->ns_err_param; | |
440 | badseq = SI(&ep->ns_err_idp)->si_seq; | |
441 | for (m = sb->sb_mb; m; m = m->m_act) { | |
442 | si = mtod(m, struct spidp *); | |
443 | if (si->si_seq == badseq) | |
444 | break; | |
445 | } | |
99e0091e | 446 | if (m == 0) return; |
4258e601 KS |
447 | firstbad = m; |
448 | /*for (;;) {*/ | |
449 | /* calculate length */ | |
450 | for (m0 = m, len = 0; m ; m = m->m_next) | |
451 | len += m->m_len; | |
452 | if (len > cb->s_mtu) { | |
453 | } | |
454 | /* FINISH THIS | |
455 | } */ | |
456 | } | |
457 | } | |
f97be0c9 | 458 | #endif |
4258e601 KS |
459 | |
460 | int spp_output_cnt = 0; | |
fe594349 | 461 | |
4258e601 KS |
462 | spp_output(cb, m0) |
463 | register struct sppcb *cb; | |
464 | struct mbuf *m0; | |
465 | { | |
466 | struct socket *so = cb->s_nspcb->nsp_socket; | |
467 | register struct mbuf *m; | |
468 | register struct spidp *si = (struct spidp *) 0; | |
469 | register struct sockbuf *sb = &(so->so_snd); | |
470 | register int len = 0; | |
f97be0c9 | 471 | int mtu = cb->s_mtu; |
99e0091e KS |
472 | int error = 0; |
473 | u_short lookfor = 0; | |
4258e601 KS |
474 | struct mbuf *mprev; |
475 | extern int idpcksum; | |
476 | ||
99e0091e | 477 | if (m0) { |
4258e601 KS |
478 | for (m = m0; m ; m = m->m_next) { |
479 | mprev = m; | |
480 | len += m->m_len; | |
481 | } | |
482 | if (len > mtu) { | |
483 | if (cb->s_flags & SF_PI) { | |
484 | m_freem(m0); | |
9ad31c34 | 485 | return (EMSGSIZE); |
4258e601 KS |
486 | } else { |
487 | int off = 0; | |
488 | while (len > mtu) { | |
489 | m = m_copy(m0, off, mtu); | |
99e0091e | 490 | if (m == NULL) { |
9ad31c34 KS |
491 | m_freem(m0); |
492 | return (ENOBUFS); | |
493 | } | |
4258e601 KS |
494 | error = spp_output(cb, m); |
495 | if (error) { | |
496 | m_freem(m0); | |
9ad31c34 | 497 | return (error); |
4258e601 KS |
498 | } |
499 | m_adj(m0, mtu); | |
500 | len -= mtu; | |
501 | } | |
502 | } | |
503 | } | |
99e0091e KS |
504 | /* |
505 | * Force length even, by adding a "garbage byte" if | |
506 | * necessary. | |
507 | */ | |
4258e601 | 508 | if (len & 1) { |
fe594349 | 509 | m = mprev; |
99e0091e | 510 | if (m->m_len + m->m_off < MMAXOFF) |
4258e601 | 511 | m->m_len++; |
99e0091e | 512 | else { |
4258e601 KS |
513 | struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA); |
514 | ||
515 | if (m1 == 0) { | |
516 | m_freem(m0); | |
517 | return (ENOBUFS); | |
518 | } | |
519 | m1->m_len = 1; | |
520 | m1->m_off = MMAXOFF - 1; | |
99e0091e | 521 | m->m_next = m1; |
4258e601 KS |
522 | } |
523 | } | |
524 | m = m_get(M_DONTWAIT, MT_HEADER); | |
525 | if (m == 0) { | |
526 | m_freem(m0); | |
9ad31c34 | 527 | return (ENOBUFS); |
4258e601 KS |
528 | } |
529 | ||
530 | /* | |
531 | * Fill in mbuf with extended SP header | |
532 | * and addresses and length put into network format. | |
533 | */ | |
534 | m->m_off = MMAXOFF - sizeof (struct spidp); | |
535 | m->m_len = sizeof (struct spidp); | |
536 | m->m_next = m0; | |
537 | si = mtod(m, struct spidp *); | |
538 | *si = cb->s_shdr; | |
539 | if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) { | |
99e0091e KS |
540 | register struct sphdr *sh; |
541 | if (m0->m_len < sizeof (*sh)) { | |
542 | if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) { | |
543 | (void) m_free(m); | |
544 | m_freem(m0); | |
545 | return (EINVAL); | |
546 | } | |
547 | m->m_next = m0; | |
548 | } | |
549 | sh = mtod(m0, struct sphdr *); | |
4258e601 KS |
550 | si->si_dt = sh->sp_dt; |
551 | si->si_cc |= sh->sp_cc & SP_EM; | |
552 | m0->m_len -= sizeof (*sh); | |
553 | m0->m_off += sizeof (*sh); | |
554 | len -= sizeof (*sh); | |
555 | } | |
556 | len += sizeof(*si); | |
fe594349 KS |
557 | if (cb->s_oobflags & SF_SOOB) { |
558 | /* | |
559 | * Per jqj@cornell: | |
560 | * make sure OB packets convey exactly 1 byte. | |
561 | * If the packet is 1 byte or larger, we | |
562 | * have already guaranted there to be at least | |
563 | * one garbage byte for the checksum, and | |
564 | * extra bytes shouldn't hurt! | |
fe594349 KS |
565 | */ |
566 | if (len > sizeof(*si)) { | |
567 | si->si_cc |= SP_OB; | |
568 | len = (1 + sizeof(*si)); | |
569 | } | |
570 | } | |
f97be0c9 | 571 | si->si_len = htons((u_short)len); |
4258e601 KS |
572 | /* |
573 | * queue stuff up for output | |
574 | */ | |
575 | sbappendrecord(sb,m); | |
576 | cb->s_seq++; | |
577 | } | |
4258e601 KS |
578 | /* |
579 | * update window | |
580 | */ | |
581 | { | |
f97be0c9 KS |
582 | register struct sockbuf *sb2 = &so->so_rcv; |
583 | int credit = ((sb2->sb_mbmax - sb2->sb_mbcnt) / cb->s_mtu); | |
4258e601 KS |
584 | int alo = cb->s_ack + credit; |
585 | ||
99e0091e KS |
586 | if (cb->s_alo < alo) |
587 | cb->s_alo = alo; | |
4258e601 KS |
588 | } |
589 | ||
590 | if (cb->s_oobflags & SF_SOOB) { | |
591 | /* | |
592 | * must transmit this out of band packet | |
593 | */ | |
594 | cb->s_oobflags &= ~ SF_SOOB; | |
595 | } else { | |
596 | /* | |
597 | * Decide what to transmit: | |
598 | * If we have a new packet, send that | |
599 | * (So long as it is in our allocation) | |
600 | * If it is time to retransmit a packet, | |
601 | * send that. | |
602 | * Otherwise, see if it time to bang on them | |
603 | * to ask for our current allocation. | |
604 | */ | |
605 | if (SSEQ_LT(cb->s_snt, cb->s_ralo)) | |
606 | lookfor = cb->s_snt + 1; | |
99e0091e | 607 | else if (cb->s_force == (1+TCPT_REXMT)) { |
4258e601 KS |
608 | lookfor = cb->s_rack; |
609 | } else if (SSEQ_LT(cb->s_ralo, cb->s_seq)) { | |
610 | lookfor = 0; | |
99e0091e | 611 | if (cb->s_timer[TCPT_PERSIST] == 0) { |
4258e601 | 612 | spp_setpersist(cb); |
99e0091e | 613 | /* tcp has cb->s_rxtshift = 0; here */ |
4258e601 KS |
614 | } |
615 | } | |
616 | m = sb->sb_mb; | |
99e0091e | 617 | while (m) { |
4258e601 KS |
618 | si = mtod(m, struct spidp *); |
619 | m = m->m_act; | |
620 | if (SSEQ_LT(si->si_seq, cb->s_rack)) { | |
621 | if ((sb->sb_flags & SB_WAIT) | |
622 | || so->so_snd.sb_sel) | |
623 | sowwakeup(so); | |
624 | sbdroprecord(sb); | |
625 | si = 0; | |
626 | continue; | |
627 | } | |
628 | if (SSEQ_LT(si->si_seq, lookfor)) | |
629 | continue; | |
630 | break; | |
631 | } | |
99e0091e KS |
632 | if (si && (si->si_seq != lookfor)) |
633 | si = 0; | |
4258e601 KS |
634 | } |
635 | cb->s_want = lookfor; | |
636 | ||
637 | if (si) { | |
638 | /* | |
639 | * must make a copy of this packet for | |
640 | * idp_output to monkey with | |
641 | */ | |
99e0091e KS |
642 | m = m_copy(dtom(si), 0, (int)M_COPYALL); |
643 | if (m == NULL) | |
9ad31c34 KS |
644 | return (ENOBUFS); |
645 | m0 = m; | |
4258e601 KS |
646 | si = mtod(m, struct spidp *); |
647 | } else if (cb->s_force || cb->s_flags & SF_AK) { | |
648 | /* | |
649 | * Must send an acknowledgement or a probe | |
650 | */ | |
651 | m = m_get(M_DONTWAIT, MT_HEADER); | |
652 | if (m == 0) | |
9ad31c34 | 653 | return (ENOBUFS); |
4258e601 KS |
654 | /* |
655 | * Fill in mbuf with extended SP header | |
656 | * and addresses and length put into network format. | |
657 | */ | |
658 | m->m_off = MMAXOFF - sizeof (struct spidp); | |
659 | m->m_len = sizeof (*si); | |
660 | m->m_next = 0; | |
661 | si = mtod(m, struct spidp *); | |
662 | *si = cb->s_shdr; | |
663 | si->si_seq = cb->s_snt + 1; | |
fe594349 | 664 | si->si_len = htons(sizeof (*si)); |
4258e601 KS |
665 | si->si_cc |= SP_SP; |
666 | cb->s_flags &= ~SF_AK; | |
667 | } | |
668 | /* | |
669 | * Stuff checksum and output datagram. | |
670 | */ | |
671 | if (si) { | |
672 | /* | |
673 | * If we are almost out of allocation | |
674 | * or one of the timers has gone off | |
675 | * request an ack. | |
676 | */ | |
99e0091e | 677 | if (SSEQ_GEQ(cb->s_seq, cb->s_ralo)) |
4258e601 KS |
678 | si->si_cc |= SP_SA; |
679 | if (cb->s_force) { | |
680 | si->si_cc |= SP_SA; | |
681 | cb->s_force = 0; | |
682 | } | |
99e0091e KS |
683 | /* |
684 | * If this is a new packet (and not a system packet), | |
fe594349 KS |
685 | * and we are not currently timing anything, |
686 | * time this one and ask for an ack. | |
4258e601 | 687 | */ |
99e0091e | 688 | if (SSEQ_LT(cb->s_snt, si->si_seq) && (!(si->si_cc & SP_SP))) { |
4258e601 | 689 | cb->s_snt = si->si_seq; |
99e0091e | 690 | if (cb->s_rtt == 0) { |
4258e601 KS |
691 | cb->s_rtseq = si->si_seq; |
692 | cb->s_rtt = 1; | |
693 | si->si_cc |= SP_SA; | |
694 | } | |
695 | /* | |
696 | * If the retransmit timer has not been set | |
697 | * and this is a real packet | |
698 | * then start the retransmit timer | |
699 | */ | |
99e0091e | 700 | if (cb->s_timer[TCPT_REXMT] == 0) { |
4258e601 KS |
701 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], |
702 | tcp_beta * cb->s_srtt, TCPTV_MIN, | |
703 | TCPTV_MAX); | |
704 | cb->s_rxtshift = 0; | |
705 | } | |
706 | } | |
707 | si->si_seq = htons(si->si_seq); | |
708 | si->si_alo = htons(cb->s_alo); | |
709 | si->si_ack = htons(cb->s_ack); | |
710 | ||
711 | if (idpcksum) { | |
712 | si->si_sum = 0; | |
fe594349 | 713 | len = ntohs(si->si_len); |
99e0091e KS |
714 | if (len & 1) |
715 | len++; | |
4258e601 KS |
716 | si->si_sum = ns_cksum(dtom(si), len); |
717 | } else | |
718 | si->si_sum = 0xffff; | |
719 | ||
720 | if (so->so_options & SO_DEBUG || traceallspps) | |
721 | spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); | |
722 | spp_output_cnt++; | |
723 | if (so->so_options & SO_DONTROUTE) | |
724 | error = ns_output(m, (struct route *)0, NS_ROUTETOIF); | |
725 | else | |
726 | error = ns_output(m, &cb->s_nspcb->nsp_route, 0); | |
727 | if (traceallspps && sppconsdebug) { | |
728 | printf("spp_out: %x\n", error); | |
729 | } | |
9ad31c34 | 730 | return (error); |
4258e601 KS |
731 | } |
732 | if (so->so_options & SO_DEBUG || traceallspps) | |
733 | spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); | |
9ad31c34 | 734 | return (error); |
4258e601 KS |
735 | } |
736 | ||
737 | /*ARGSUSED*/ | |
738 | spp_ctloutput(req, so, level, name, value) | |
739 | int req; | |
740 | struct socket *so; | |
741 | int name; | |
742 | struct mbuf **value; | |
743 | { | |
744 | register struct mbuf *m; | |
745 | struct nspcb *nsp = sotonspcb(so); | |
746 | register struct sppcb *cb; | |
747 | int mask, error = 0; | |
748 | ||
749 | if (level != NSPROTO_SPP) { | |
750 | /* This will have to be changed when we do more general | |
751 | stacking of protocols */ | |
9ad31c34 | 752 | return (idp_ctloutput(req, so, level, name, value)); |
4258e601 KS |
753 | } |
754 | if (nsp == NULL) { | |
755 | error = EINVAL; | |
756 | goto release; | |
757 | } else | |
758 | cb = nstosppcb(nsp); | |
759 | ||
760 | switch (req) { | |
9ad31c34 | 761 | |
4258e601 | 762 | case PRCO_GETOPT: |
99e0091e | 763 | if (value == NULL) |
9ad31c34 | 764 | return (EINVAL); |
4258e601 | 765 | m = m_get(M_DONTWAIT, MT_DATA); |
99e0091e | 766 | if (m == NULL) |
9ad31c34 | 767 | return (ENOBUFS); |
4258e601 | 768 | switch (name) { |
9ad31c34 | 769 | |
4258e601 KS |
770 | case SO_HEADERS_ON_INPUT: |
771 | mask = SF_HI; | |
772 | goto get_flags; | |
9ad31c34 | 773 | |
4258e601 KS |
774 | case SO_HEADERS_ON_OUTPUT: |
775 | mask = SF_HO; | |
776 | get_flags: | |
777 | m->m_len = sizeof(short); | |
778 | m->m_off = MMAXOFF - sizeof(short); | |
779 | *mtod(m, short *) = cb->s_flags & mask; | |
780 | break; | |
9ad31c34 | 781 | |
4258e601 KS |
782 | case SO_LAST_HEADER: |
783 | m->m_len = sizeof(struct sphdr); | |
784 | m->m_off = MMAXOFF - sizeof(struct sphdr); | |
785 | *mtod(m, struct sphdr *) = cb->s_rhdr; | |
786 | break; | |
9ad31c34 | 787 | |
4258e601 KS |
788 | case SO_DEFAULT_HEADERS: |
789 | m->m_len = sizeof(struct spidp); | |
790 | m->m_off = MMAXOFF - sizeof(struct sphdr); | |
791 | *mtod(m, struct sphdr *) = cb->s_shdr.si_s; | |
792 | } | |
793 | *value = m; | |
794 | break; | |
9ad31c34 | 795 | |
4258e601 KS |
796 | case PRCO_SETOPT: |
797 | switch (name) { | |
f97be0c9 | 798 | int *ok; |
4258e601 KS |
799 | |
800 | case SO_HEADERS_ON_INPUT: | |
801 | mask = SF_HI; | |
802 | goto set_head; | |
9ad31c34 | 803 | |
4258e601 KS |
804 | case SO_HEADERS_ON_OUTPUT: |
805 | mask = SF_HO; | |
806 | set_head: | |
807 | if (value && *value) { | |
808 | ok = mtod(*value, int *); | |
809 | if (*ok) | |
810 | cb->s_flags |= mask; | |
811 | else | |
812 | cb->s_flags &= ~mask; | |
813 | } else error = EINVAL; | |
814 | break; | |
9ad31c34 | 815 | |
4258e601 KS |
816 | case SO_DEFAULT_HEADERS: |
817 | { | |
818 | register struct sphdr *sp | |
819 | = mtod(*value, struct sphdr *); | |
820 | cb->s_dt = sp->sp_dt; | |
821 | cb->s_cc = sp->sp_cc & SP_EM; | |
822 | } | |
823 | } | |
824 | if (value && *value) | |
825 | m_freem(*value); | |
826 | break; | |
827 | } | |
828 | release: | |
9ad31c34 | 829 | return (error); |
4258e601 KS |
830 | } |
831 | ||
832 | /*ARGSUSED*/ | |
833 | spp_usrreq(so, req, m, nam, rights) | |
834 | struct socket *so; | |
835 | int req; | |
836 | struct mbuf *m, *nam, *rights; | |
837 | { | |
838 | struct nspcb *nsp = sotonspcb(so); | |
839 | register struct sppcb *cb; | |
840 | int s = splnet(); | |
841 | int error = 0, ostate; | |
842 | ||
843 | if (req == PRU_CONTROL) | |
844 | return (ns_control(so, (int)m, (caddr_t)nam, | |
845 | (struct ifnet *)rights)); | |
846 | if (rights && rights->m_len) { | |
847 | error = EINVAL; | |
848 | goto release; | |
849 | } | |
850 | if (nsp == NULL) { | |
851 | if (req != PRU_ATTACH) { | |
852 | error = EINVAL; | |
853 | goto release; | |
854 | } | |
855 | } else | |
856 | cb = nstosppcb(nsp); | |
857 | ||
858 | ostate = cb ? cb->s_state : 0; | |
859 | ||
860 | switch (req) { | |
9ad31c34 | 861 | |
4258e601 KS |
862 | case PRU_ATTACH: |
863 | if (nsp != NULL) { | |
864 | error = EISCONN; | |
865 | break; | |
866 | } | |
867 | error = ns_pcballoc(so, &nspcb); | |
868 | if (error) | |
869 | break; | |
870 | error = soreserve(so, 2048, 2048); | |
871 | if (error) | |
872 | break; | |
873 | nsp = sotonspcb(so); | |
874 | { | |
875 | struct mbuf *mm = m_getclr(M_DONTWAIT,MT_PCB); | |
876 | ||
99e0091e | 877 | if (mm == NULL) { |
4258e601 KS |
878 | error = ENOBUFS; |
879 | break; | |
880 | } | |
881 | cb = mtod(mm, struct sppcb *); | |
882 | cb->s_state = TCPS_LISTEN; | |
4258e601 KS |
883 | cb->s_snt = -1; |
884 | cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q; | |
885 | cb->s_nspcb = nsp; | |
886 | nsp->nsp_pcb = (caddr_t) cb; | |
887 | } | |
888 | break; | |
889 | ||
890 | case PRU_DETACH: | |
891 | if (nsp == NULL) { | |
892 | error = ENOTCONN; | |
893 | break; | |
894 | } | |
895 | if (cb->s_state > TCPS_LISTEN) | |
896 | cb = spp_disconnect(cb); | |
897 | else | |
898 | cb = spp_close(cb); | |
899 | break; | |
900 | ||
901 | case PRU_BIND: | |
902 | error = ns_pcbbind(nsp, nam); | |
903 | break; | |
904 | ||
905 | case PRU_LISTEN: | |
906 | if (nsp->nsp_lport == 0) | |
907 | error = ns_pcbbind(nsp, (struct mbuf *)0); | |
908 | if (error == 0) | |
909 | cb->s_state = TCPS_LISTEN; | |
910 | break; | |
911 | ||
912 | /* | |
913 | * Initiate connection to peer. | |
914 | * Enter SYN_SENT state, and mark socket as connecting. | |
915 | * Start keep-alive timer, setup prototype header, | |
916 | * Send initial system packet requesting connection. | |
917 | */ | |
918 | case PRU_CONNECT: | |
919 | if (nsp->nsp_lport == 0) { | |
920 | error = ns_pcbbind(nsp, (struct mbuf *)0); | |
921 | if (error) | |
922 | break; | |
923 | } | |
924 | error = ns_pcbconnect(nsp, nam); | |
925 | if (error) | |
926 | break; | |
927 | soisconnecting(so); | |
928 | cb->s_state = TCPS_SYN_SENT; | |
929 | cb->s_did = 0; | |
930 | spp_template(cb); | |
931 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
932 | cb->s_force = 1 + TCPTV_KEEP; | |
933 | /* | |
934 | * Other party is required to respond to | |
935 | * the port I send from, but he is not | |
936 | * required to answer from where I am sending to, | |
937 | * so allow wildcarding. | |
938 | * original port I am sending to is still saved in | |
939 | * cb->s_dport. | |
940 | */ | |
941 | nsp->nsp_fport = 0; | |
942 | error = spp_output(cb, (struct mbuf *) 0); | |
943 | break; | |
944 | ||
945 | case PRU_CONNECT2: | |
946 | error = EOPNOTSUPP; | |
947 | break; | |
948 | ||
949 | /* | |
950 | * We may decide later to implement connection closing | |
951 | * handshaking at the spp level optionally. | |
952 | * here is the hook to do it: | |
953 | */ | |
954 | case PRU_DISCONNECT: | |
955 | cb = spp_disconnect(cb); | |
956 | break; | |
957 | ||
958 | /* | |
959 | * Accept a connection. Essentially all the work is | |
960 | * done at higher levels; just return the address | |
961 | * of the peer, storing through addr. | |
962 | */ | |
963 | case PRU_ACCEPT: { | |
964 | struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); | |
965 | ||
966 | nam->m_len = sizeof (struct sockaddr_ns); | |
967 | sns->sns_family = AF_NS; | |
968 | sns->sns_addr = nsp->nsp_faddr; | |
969 | break; | |
970 | } | |
971 | ||
972 | case PRU_SHUTDOWN: | |
973 | socantsendmore(so); | |
974 | cb = spp_usrclosed(cb); | |
975 | if (cb) | |
976 | error = spp_output(cb, (struct mbuf *) 0); | |
977 | break; | |
978 | ||
979 | /* | |
980 | * After a receive, possibly send acknowledgment | |
981 | * updating allocation. | |
982 | */ | |
983 | case PRU_RCVD: | |
984 | (void) spp_output(cb, (struct mbuf *) 0); | |
985 | break; | |
986 | ||
987 | case PRU_SEND: | |
988 | error = spp_output(cb, m); | |
989 | m = NULL; | |
990 | break; | |
991 | ||
992 | case PRU_ABORT: | |
f97be0c9 | 993 | (void) spp_drop(cb, ECONNABORTED); |
4258e601 KS |
994 | break; |
995 | ||
996 | case PRU_SENSE: | |
997 | case PRU_CONTROL: | |
998 | m = NULL; | |
999 | error = EOPNOTSUPP; | |
1000 | break; | |
1001 | ||
1002 | case PRU_RCVOOB: | |
1003 | if ( ! (cb->s_oobflags & SF_IOOB) ) { | |
1004 | error = EWOULDBLOCK; | |
1005 | break; | |
1006 | } | |
1007 | m->m_len = 1; | |
1008 | *mtod(m, caddr_t) = cb->s_iobc; | |
1009 | cb->s_oobflags &= ~ SF_IOOB; | |
1010 | break; | |
1011 | ||
1012 | case PRU_SENDOOB: | |
1013 | if (sbspace(&so->so_snd) < -512) { | |
1014 | m_freem(m); | |
1015 | error = ENOBUFS; | |
1016 | break; | |
1017 | } | |
1018 | cb->s_oobflags |= SF_SOOB; | |
1019 | error = spp_output(cb, m); | |
1020 | m = NULL; | |
1021 | cb->s_oobflags &= ~SF_SOOB; | |
1022 | break; | |
1023 | ||
1024 | case PRU_SOCKADDR: | |
1025 | ns_setsockaddr(nsp, nam); | |
1026 | break; | |
1027 | ||
1028 | case PRU_PEERADDR: | |
1029 | ns_setpeeraddr(nsp, nam); | |
1030 | break; | |
1031 | ||
1032 | case PRU_SLOWTIMO: | |
1033 | cb = spp_timers(cb, (int)nam); | |
1034 | break; | |
1035 | ||
1036 | case PRU_FASTTIMO: | |
1037 | case PRU_PROTORCV: | |
1038 | case PRU_PROTOSEND: | |
1039 | error = EOPNOTSUPP; | |
1040 | break; | |
1041 | ||
1042 | default: | |
1043 | panic("sp_usrreq"); | |
1044 | } | |
1045 | if (cb && (so->so_options & SO_DEBUG || traceallspps)) | |
f97be0c9 | 1046 | spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req); |
4258e601 KS |
1047 | release: |
1048 | if (m != NULL) | |
1049 | m_freem(m); | |
1050 | splx(s); | |
1051 | return (error); | |
1052 | } | |
1053 | ||
1054 | spp_usrreq_sp(so, req, m, nam, rights) | |
1055 | struct socket *so; | |
1056 | int req; | |
1057 | struct mbuf *m, *nam, *rights; | |
1058 | { | |
1059 | int error = spp_usrreq(so, req, m, nam, rights); | |
1060 | ||
99e0091e | 1061 | if (req == PRU_ATTACH && error == 0) { |
4258e601 KS |
1062 | struct nspcb *nsp = sotonspcb(so); |
1063 | ((struct sppcb *)nsp->nsp_pcb)->s_flags |= | |
1064 | (SF_HI | SF_HO | SF_PI); | |
1065 | } | |
9ad31c34 | 1066 | return (error); |
4258e601 KS |
1067 | } |
1068 | ||
1069 | /* | |
1070 | * Create template to be used to send spp packets on a connection. | |
1071 | * Called after host entry created, fills | |
1072 | * in a skeletal spp header (choosing connection id), | |
1073 | * minimizing the amount of work necessary when the connection is used. | |
1074 | */ | |
1075 | spp_template(cb) | |
1076 | struct sppcb *cb; | |
1077 | { | |
1078 | register struct nspcb *nsp = cb->s_nspcb; | |
1079 | register struct spidp *n = &(cb->s_shdr); | |
1080 | ||
1081 | cb->s_mtu = 1024; | |
1082 | n->si_pt = NSPROTO_SPP; | |
1083 | n->si_sna = nsp->nsp_laddr; | |
1084 | n->si_dna = nsp->nsp_faddr; | |
1085 | n->si_sid = htons(spp_iss); | |
1086 | spp_iss += SPP_ISSINCR/2; | |
1087 | n->si_alo = 1; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Close a SPIP control block: | |
1092 | * discard spp control block itself | |
1093 | * discard ns protocol control block | |
1094 | * wake up any sleepers | |
1095 | */ | |
1096 | struct sppcb * | |
1097 | spp_close(cb) | |
1098 | register struct sppcb *cb; | |
1099 | { | |
1100 | register struct spidp_q *s; | |
1101 | struct nspcb *nsp = cb->s_nspcb; | |
1102 | struct socket *so = nsp->nsp_socket; | |
1103 | register struct mbuf *m; | |
1104 | ||
1105 | s = cb->s_q.si_next; | |
1106 | while (s != &(cb->s_q)) { | |
1107 | s = s->si_next; | |
1108 | m = dtom(s->si_prev); | |
1109 | remque(s->si_prev); | |
1110 | m_freem(m); | |
1111 | } | |
1112 | (void) m_free(dtom(cb)); | |
1113 | nsp->nsp_pcb = 0; | |
1114 | soisdisconnected(so); | |
1115 | ns_pcbdetach(nsp); | |
9ad31c34 | 1116 | return ((struct sppcb *)0); |
4258e601 KS |
1117 | } |
1118 | /* | |
1119 | * Someday we may do level 3 handshaking | |
1120 | * to close a connection or send a xerox style error. | |
1121 | * For now, just close. | |
1122 | */ | |
1123 | struct sppcb * | |
1124 | spp_usrclosed(cb) | |
1125 | register struct sppcb *cb; | |
1126 | { | |
9ad31c34 | 1127 | return (spp_close(cb)); |
4258e601 KS |
1128 | } |
1129 | struct sppcb * | |
1130 | spp_disconnect(cb) | |
1131 | register struct sppcb *cb; | |
1132 | { | |
9ad31c34 | 1133 | return (spp_close(cb)); |
4258e601 KS |
1134 | } |
1135 | /* | |
1136 | * Drop connection, reporting | |
1137 | * the specified error. | |
1138 | */ | |
1139 | struct sppcb * | |
1140 | spp_drop(cb, errno) | |
1141 | register struct sppcb *cb; | |
1142 | int errno; | |
1143 | { | |
1144 | struct socket *so = cb->s_nspcb->nsp_socket; | |
1145 | ||
1146 | /* | |
1147 | * someday, in the xerox world | |
1148 | * we will generate error protocol packets | |
1149 | * announcing that the socket has gone away. | |
1150 | */ | |
1151 | /*if (TCPS_HAVERCVDSYN(tp->t_state)) { | |
1152 | tp->t_state = TCPS_CLOSED; | |
1153 | (void) tcp_output(tp); | |
1154 | }*/ | |
1155 | so->so_error = errno; | |
1156 | return (spp_close(cb)); | |
1157 | } | |
1158 | ||
1159 | spp_abort(nsp) | |
1160 | struct nspcb *nsp; | |
1161 | { | |
1162 | ||
f97be0c9 | 1163 | (void) spp_close((struct sppcb *)nsp->nsp_pcb); |
4258e601 KS |
1164 | } |
1165 | ||
1166 | spp_setpersist(cb) | |
1167 | register struct sppcb *cb; | |
1168 | { | |
1169 | ||
1170 | /*if (cb->s_timer[TCPT_REXMT]) | |
1171 | panic("spp_output REXMT");*/ | |
1172 | /* | |
1173 | * Start/restart persistance timer. | |
1174 | */ | |
1175 | TCPT_RANGESET(cb->s_timer[TCPT_PERSIST], | |
1176 | ((int)(tcp_beta * cb->s_srtt)) << cb->s_rxtshift, | |
1177 | TCPTV_PERSMIN, TCPTV_MAX); | |
1178 | cb->s_rxtshift++; | |
1179 | if (cb->s_rxtshift >= TCP_MAXRXTSHIFT) | |
1180 | cb->s_rxtshift = 0; | |
1181 | } | |
1182 | /* | |
1183 | * Fast timeout routine for processing delayed acks | |
1184 | */ | |
1185 | int spp_ftcnt; | |
1186 | spp_fasttimo() | |
1187 | { | |
1188 | register struct nspcb *nsp; | |
1189 | register struct sppcb *cb; | |
1190 | int s = splnet(); | |
1191 | ||
1192 | nsp = nspcb.nsp_next; | |
1193 | spp_ftcnt++; | |
1194 | if (nsp) | |
1195 | for (; nsp != &nspcb; nsp = nsp->nsp_next) | |
1196 | if ((cb = (struct sppcb *)nsp->nsp_pcb) && | |
1197 | (cb->s_flags & SF_DELACK)) { | |
1198 | cb->s_flags &= ~SF_DELACK; | |
1199 | cb->s_flags |= SF_AK; | |
1200 | (void) spp_output(cb, (struct mbuf *) 0); | |
1201 | } | |
1202 | splx(s); | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * spp protocol timeout routine called every 500 ms. | |
1207 | * Updates the timers in all active pcb's and | |
1208 | * causes finite state machine actions if timers expire. | |
1209 | */ | |
1210 | spp_slowtimo() | |
1211 | { | |
1212 | register struct nspcb *ip, *ipnxt; | |
1213 | register struct sppcb *cb; | |
1214 | int s = splnet(); | |
1215 | register int i; | |
1216 | ||
1217 | /* | |
1218 | * Search through tcb's and update active timers. | |
1219 | */ | |
1220 | ip = nspcb.nsp_next; | |
1221 | if (ip == 0) { | |
1222 | splx(s); | |
1223 | return; | |
1224 | } | |
1225 | while (ip != &nspcb) { | |
1226 | cb = nstosppcb(ip); | |
1227 | ipnxt = ip->nsp_next; | |
1228 | if (cb == 0) | |
1229 | goto tpgone; | |
1230 | for (i = 0; i < TCPT_NTIMERS; i++) { | |
1231 | if (cb->s_timer[i] && --cb->s_timer[i] == 0) { | |
1232 | (void) spp_usrreq(cb->s_nspcb->nsp_socket, | |
1233 | PRU_SLOWTIMO, (struct mbuf *)0, | |
1234 | (struct mbuf *)i, (struct mbuf *)0); | |
1235 | if (ipnxt->nsp_prev != ip) | |
1236 | goto tpgone; | |
1237 | } | |
1238 | } | |
1239 | cb->s_idle++; | |
1240 | if (cb->s_rtt) | |
1241 | cb->s_rtt++; | |
1242 | tpgone: | |
1243 | ip = ipnxt; | |
1244 | } | |
1245 | spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */ | |
1246 | splx(s); | |
1247 | } | |
1248 | ||
1249 | float spp_backoff[TCP_MAXRXTSHIFT] = | |
1250 | { 1.0, 1.2, 1.4, 1.7, 2.0, 3.0, 5.0, 8.0, 16.0, 32.0 }; | |
a5c5bc2d | 1251 | int sppexprexmtbackoff = 0; |
4258e601 KS |
1252 | /* |
1253 | * TCP timer processing. | |
1254 | */ | |
1255 | struct sppcb * | |
1256 | spp_timers(cb, timer) | |
1257 | register struct sppcb *cb; | |
1258 | int timer; | |
1259 | { | |
1260 | ||
1261 | cb->s_force = 1 + timer; | |
1262 | switch (timer) { | |
1263 | ||
1264 | /* | |
1265 | * 2 MSL timeout in shutdown went off. Delete connection | |
1266 | * control block. | |
1267 | */ | |
1268 | case TCPT_2MSL: | |
1269 | cb = spp_close(cb); | |
1270 | break; | |
1271 | ||
1272 | /* | |
1273 | * Retransmission timer went off. Message has not | |
1274 | * been acked within retransmit interval. Back off | |
1275 | * to a longer retransmit interval and retransmit all | |
1276 | * unacknowledged messages in the window. | |
1277 | */ | |
1278 | case TCPT_REXMT: | |
1279 | cb->s_rxtshift++; | |
1280 | if (cb->s_rxtshift > TCP_MAXRXTSHIFT) { | |
1281 | cb = spp_drop(cb, ETIMEDOUT); | |
1282 | break; | |
1283 | } | |
1284 | (void) spp_output(cb, (struct mbuf *) 0); | |
1285 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], | |
1286 | (int)cb->s_srtt, TCPTV_MIN, TCPTV_MAX); | |
a5c5bc2d | 1287 | if (sppexprexmtbackoff) { |
4258e601 KS |
1288 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], |
1289 | cb->s_timer[TCPT_REXMT] << cb->s_rxtshift, | |
1290 | TCPTV_MIN, TCPTV_MAX); | |
1291 | } else { | |
1292 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], | |
1293 | cb->s_timer[TCPT_REXMT] * | |
1294 | spp_backoff[cb->s_rxtshift - 1], | |
1295 | TCPTV_MIN, TCPTV_MAX); | |
1296 | } | |
1297 | break; | |
1298 | ||
1299 | /* | |
1300 | * Persistance timer into zero window. | |
1301 | * Force a probe to be sent. | |
1302 | */ | |
1303 | case TCPT_PERSIST: | |
1304 | (void) spp_output(cb, (struct mbuf *) 0); | |
1305 | spp_setpersist(cb); | |
1306 | break; | |
1307 | ||
1308 | /* | |
1309 | * Keep-alive timer went off; send something | |
1310 | * or drop connection if idle for too long. | |
1311 | */ | |
1312 | case TCPT_KEEP: | |
1313 | if (cb->s_state < TCPS_ESTABLISHED) | |
1314 | goto dropit; | |
1315 | if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) { | |
1316 | if (cb->s_idle >= TCPTV_MAXIDLE) | |
1317 | goto dropit; | |
1318 | (void) spp_output(cb, (struct mbuf *) 0); | |
1319 | } else | |
1320 | cb->s_idle = 0; | |
1321 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
1322 | break; | |
1323 | dropit: | |
1324 | cb = spp_drop(cb, ETIMEDOUT); | |
1325 | break; | |
1326 | } | |
1327 | return (cb); | |
1328 | } |