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 | * | |
d8e9f818 | 6 | * @(#)spp_usrreq.c 6.12 (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; | |
4258e601 | 44 | int spp_hardnosed; |
8e189bed KS |
45 | |
46 | /*ARGSUSED*/ | |
47 | spp_input(m, nsp, ifp) | |
4258e601 | 48 | register struct mbuf *m; |
fe594349 | 49 | register struct nspcb *nsp; |
8e189bed | 50 | struct ifnet *ifp; |
e3c149da | 51 | { |
4258e601 KS |
52 | register struct sppcb *cb; |
53 | register struct spidp *si = mtod(m, struct spidp *); | |
54 | register struct socket *so; | |
f97be0c9 | 55 | short ostate; |
4258e601 KS |
56 | int dropsocket = 0; |
57 | ||
58 | ||
99e0091e | 59 | if (nsp == 0) { |
e3c149da | 60 | panic("No nspcb in spp_input\n"); |
fe594349 KS |
61 | return; |
62 | } | |
4258e601 KS |
63 | |
64 | cb = nstosppcb(nsp); | |
65 | if (cb == 0) goto bad; | |
66 | ||
e3c149da | 67 | if (m->m_len < sizeof(*si)) { |
99e0091e | 68 | if ((m = m_pullup(m, sizeof(*si))) == 0) { |
e3c149da KS |
69 | spp_istat.hdrops++; |
70 | return; | |
71 | } | |
72 | si = mtod(m, struct spidp *); | |
73 | } | |
4258e601 KS |
74 | si->si_seq = ntohs(si->si_seq); |
75 | si->si_ack = ntohs(si->si_ack); | |
76 | si->si_alo = ntohs(si->si_alo); | |
77 | ||
78 | so = nsp->nsp_socket; | |
79 | if (so->so_options & SO_DEBUG || traceallspps) { | |
80 | ostate = cb->s_state; | |
81 | spp_savesi = *si; | |
82 | } | |
83 | if (so->so_options & SO_ACCEPTCONN) { | |
84 | so = sonewconn(so); | |
85 | if (so == 0) { | |
86 | spp_istat.nonucn++; | |
87 | goto drop; | |
88 | } | |
89 | /* | |
90 | * This is ugly, but .... | |
91 | * | |
92 | * Mark socket as temporary until we're | |
93 | * committed to keeping it. The code at | |
94 | * ``drop'' and ``dropwithreset'' check the | |
95 | * flag dropsocket to see if the temporary | |
96 | * socket created here should be discarded. | |
97 | * We mark the socket as discardable until | |
98 | * we're committed to it below in TCPS_LISTEN. | |
99 | */ | |
100 | dropsocket++; | |
101 | nsp = (struct nspcb *)so->so_pcb; | |
102 | nsp->nsp_laddr = si->si_dna; | |
103 | cb = nstosppcb(nsp); | |
104 | cb->s_state = TCPS_LISTEN; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Packet received on connection. | |
109 | * reset idle time and keep-alive timer; | |
110 | */ | |
111 | cb->s_idle = 0; | |
112 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
113 | ||
114 | switch (cb->s_state) { | |
9ad31c34 | 115 | |
4258e601 KS |
116 | case TCPS_LISTEN:{ |
117 | struct mbuf *am; | |
118 | register struct sockaddr_ns *sns; | |
119 | struct ns_addr laddr; | |
120 | ||
121 | /* | |
122 | * If somebody here was carying on a conversation | |
123 | * and went away, and his pen pal thinks he can | |
124 | * still talk, we get the misdirected packet. | |
125 | */ | |
126 | if (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) { | |
127 | spp_istat.gonawy++; | |
128 | goto dropwithreset; | |
129 | } | |
130 | am = m_get(M_DONTWAIT, MT_SONAME); | |
131 | if (am == NULL) | |
132 | goto drop; | |
133 | am->m_len = sizeof (struct sockaddr_ns); | |
134 | sns = mtod(am, struct sockaddr_ns *); | |
135 | sns->sns_family = AF_NS; | |
136 | sns->sns_addr = si->si_sna; | |
137 | laddr = nsp->nsp_laddr; | |
138 | if (ns_nullhost(laddr)) | |
139 | nsp->nsp_laddr = si->si_dna; | |
140 | if (ns_pcbconnect(nsp, am)) { | |
141 | nsp->nsp_laddr = laddr; | |
142 | (void) m_free(am); | |
143 | spp_istat.noconn++; | |
144 | goto drop; | |
145 | } | |
146 | (void) m_free(am); | |
4258e601 | 147 | spp_template(cb); |
d8e9f818 | 148 | dropsocket = 0; /* committed to socket */ |
4258e601 KS |
149 | cb->s_did = si->si_sid; |
150 | cb->s_rack = si->si_ack; | |
151 | cb->s_ralo = si->si_alo; | |
d8e9f818 KS |
152 | #define THREEWAYSHAKE |
153 | #ifdef THREEWAYSHAKE | |
154 | cb->s_state = TCPS_SYN_RECEIVED; | |
155 | cb->s_force = 1 + TCPT_REXMT; | |
156 | cb->s_timer[TCPT_REXMT] = 2 * TCPTV_MIN; | |
4258e601 KS |
157 | } |
158 | break; | |
d8e9f818 KS |
159 | /* |
160 | * This state means that we have heard a response | |
161 | * to our acceptance of their connection | |
162 | * It is probably logically unnecessary in this | |
163 | * implementation. | |
164 | */ | |
165 | case TCPS_SYN_RECEIVED: | |
166 | if (si->si_did!=cb->s_sid) { | |
167 | spp_istat.wrncon++; | |
168 | goto drop; | |
169 | } | |
170 | #endif | |
171 | nsp->nsp_fport = si->si_sport; | |
172 | cb->s_timer[TCPT_REXMT] = 0; | |
173 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
174 | soisconnected(so); | |
175 | cb->s_state = TCPS_ESTABLISHED; | |
176 | break; | |
4258e601 KS |
177 | |
178 | /* | |
179 | * This state means that we have gotten a response | |
180 | * to our attempt to establish a connection. | |
fe594349 KS |
181 | * We fill in the data from the other side, |
182 | * telling us which port to respond to, instead of the well- | |
183 | * known one we might have sent to in the first place. | |
4258e601 | 184 | * We also require that this is a response to our |
fe594349 | 185 | * connection id. |
4258e601 KS |
186 | */ |
187 | case TCPS_SYN_SENT: | |
188 | if (si->si_did!=cb->s_sid) { | |
189 | spp_istat.notme++; | |
190 | goto drop; | |
191 | } | |
192 | cb->s_did = si->si_sid; | |
193 | cb->s_rack = si->si_ack; | |
194 | cb->s_ralo = si->si_alo; | |
195 | cb->s_dport = nsp->nsp_fport = si->si_sport; | |
196 | cb->s_timer[TCPT_REXMT] = 0; | |
197 | cb->s_flags |= SF_AK; | |
198 | soisconnected(so); | |
199 | cb->s_state = TCPS_ESTABLISHED; | |
4258e601 KS |
200 | } |
201 | if (so->so_options & SO_DEBUG || traceallspps) | |
f97be0c9 | 202 | spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
203 | |
204 | m->m_len -= sizeof (struct idp); | |
205 | m->m_off += sizeof (struct idp); | |
206 | ||
207 | if (spp_reass(cb,si)) { | |
4258e601 KS |
208 | goto drop; |
209 | } | |
f97be0c9 | 210 | (void) spp_output(cb,(struct mbuf *)0); |
4258e601 KS |
211 | return; |
212 | ||
213 | dropwithreset: | |
214 | if (dropsocket) | |
215 | (void) soabort(so); | |
216 | si->si_seq = ntohs(si->si_seq); | |
217 | si->si_ack = ntohs(si->si_ack); | |
218 | si->si_alo = ntohs(si->si_alo); | |
219 | ns_error(dtom(si), NS_ERR_NOSOCK, 0); | |
220 | if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps) | |
f97be0c9 | 221 | spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
222 | return; |
223 | ||
224 | drop: | |
225 | bad: | |
99e0091e | 226 | if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps) |
f97be0c9 | 227 | spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0); |
4258e601 KS |
228 | m_freem(m); |
229 | } | |
230 | ||
231 | /* | |
232 | * This is structurally similar to the tcp reassembly routine | |
233 | * but its function is somewhat different: It merely queues | |
234 | * packets up, and suppresses duplicates. | |
235 | */ | |
236 | spp_reass(cb,si) | |
237 | register struct sppcb *cb; | |
238 | register struct spidp *si; | |
239 | { | |
240 | register struct spidp_q *q; | |
241 | register struct mbuf *m; | |
242 | struct socket *so = cb->s_nspcb->nsp_socket; | |
243 | struct sockbuf *sb = & (so->so_rcv); | |
244 | char packetp = cb->s_flags & SF_HI; | |
245 | char wakeup = 0; | |
246 | ||
247 | ||
99e0091e | 248 | if (si == SI(0)) |
4258e601 KS |
249 | goto present; |
250 | /* | |
251 | * Update our news from them. | |
252 | */ | |
253 | if (si->si_cc & SP_SA) | |
254 | cb->s_flags |= SF_DELACK; | |
255 | if (SSEQ_GT(si->si_ack,cb->s_rack)) { | |
256 | cb->s_rack = si->si_ack; | |
257 | cb->s_timer[TCPT_REXMT] = 0; | |
258 | ||
259 | /* | |
260 | * If transmit timer is running and timed sequence | |
261 | * number was acked, update smoothed round trip time. | |
262 | */ | |
263 | if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) { | |
264 | if (cb->s_srtt == 0) | |
265 | cb->s_srtt = cb->s_rtt; | |
266 | else | |
267 | cb->s_srtt = | |
268 | tcp_alpha * cb->s_srtt + | |
269 | (1 - tcp_alpha) * cb->s_rtt; | |
270 | cb->s_rtt = 0; | |
271 | } | |
272 | } | |
273 | if (SSEQ_GT(si->si_alo,cb->s_ralo)) { | |
274 | cb->s_ralo = si->si_alo; | |
275 | cb->s_timer[TCPT_PERSIST] = 0; | |
276 | } | |
277 | /* | |
278 | * If this is a system packet, we don't need to | |
279 | * queue it up, and won't update acknowledge # | |
280 | */ | |
ca1bb209 KS |
281 | if (si->si_cc & SP_SP) { |
282 | m_freem(dtom(si)); | |
9ad31c34 | 283 | return (0); |
ca1bb209 | 284 | } |
4258e601 KS |
285 | |
286 | /* | |
287 | * If this packet number has a sequence number less | |
288 | * than that of the first packet not yet seen coming | |
289 | * from them, this must be a duplicate, so drop. | |
290 | */ | |
fe594349 KS |
291 | if (SSEQ_LT(si->si_seq,cb->s_ack)) { |
292 | spp_istat.bdreas++; | |
99e0091e | 293 | if (si->si_seq == cb->s_ack-1) |
fe594349 | 294 | spp_istat.lstdup++; |
9ad31c34 | 295 | return (1); |
fe594349 | 296 | } |
4258e601 KS |
297 | /* |
298 | * If this packet number is higher than that which | |
299 | * we have allocated refuse it, unless urgent | |
300 | */ | |
301 | if (SSEQ_GT(si->si_seq,cb->s_alo) && (!(si->si_cc & SP_OB))) { | |
fe594349 | 302 | spp_istat.notyet++; |
9ad31c34 | 303 | return (1); |
4258e601 KS |
304 | } |
305 | /* | |
306 | * If this packet is urgent, inform process | |
307 | */ | |
308 | if (si->si_cc & SP_OB) { | |
309 | cb->s_iobc = ((char *)si)[1 + sizeof(*si)]; | |
310 | sohasoutofband(so); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Loop through all packets queued up to insert in | |
315 | * appropriate sequence. | |
316 | */ | |
317 | ||
318 | for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { | |
99e0091e | 319 | if (si->si_seq == SI(q)->si_seq) return (1); /*duplicate */ |
4258e601 KS |
320 | if (SSEQ_LT(si->si_seq,SI(q)->si_seq)) break; |
321 | } | |
322 | insque(si,q->si_prev); | |
323 | ||
324 | present: | |
325 | #define SPINC sizeof(struct sphdr) | |
326 | /* | |
327 | * Loop through all packets queued up to update acknowledge | |
328 | * number, and present all acknowledged data to user; | |
329 | * If in packet interface mode, show packet headers. | |
330 | */ | |
331 | for (q = cb->s_q.si_next; q!=&cb->s_q; q = q->si_next) { | |
99e0091e | 332 | if (SI(q)->si_seq == cb->s_ack) { |
4258e601 KS |
333 | cb->s_ack++; |
334 | m = dtom(q); | |
335 | if (SI(q)->si_cc & SP_OB) { | |
336 | if (sb->sb_cc) | |
337 | so->so_oobmark = sb->sb_cc; | |
338 | else | |
339 | so->so_state |= SS_RCVATMARK; | |
340 | } | |
341 | q = q->si_prev; | |
342 | remque(q->si_next); | |
343 | wakeup = 1; | |
344 | if (packetp) { | |
345 | sbappendrecord(sb,m); | |
346 | } else { | |
347 | cb->s_rhdr = *mtod(m, struct sphdr *); | |
348 | m->m_off += SPINC; | |
349 | m->m_len -= SPINC; | |
350 | sbappend(sb,m); | |
351 | } | |
352 | } else | |
353 | break; | |
354 | } | |
355 | if (wakeup) sorwakeup(so); | |
9ad31c34 | 356 | return (0); |
4258e601 KS |
357 | } |
358 | ||
359 | spp_ctlinput(cmd, arg) | |
360 | int cmd; | |
361 | caddr_t arg; | |
362 | { | |
363 | struct ns_addr *na; | |
364 | extern u_char nsctlerrmap[]; | |
365 | extern spp_abort(); | |
f97be0c9 | 366 | extern struct nspcb *idp_drop(); |
fe594349 KS |
367 | struct ns_errp *errp; |
368 | struct nspcb *nsp; | |
8e189bed | 369 | struct sockaddr_ns *sns; |
4258e601 KS |
370 | int type; |
371 | ||
372 | if (cmd < 0 || cmd > PRC_NCMDS) | |
373 | return; | |
374 | type = NS_ERR_UNREACH_HOST; | |
375 | ||
376 | switch (cmd) { | |
9ad31c34 | 377 | |
4258e601 KS |
378 | case PRC_ROUTEDEAD: |
379 | case PRC_QUENCH: | |
380 | break; | |
381 | ||
382 | case PRC_IFDOWN: | |
4258e601 KS |
383 | case PRC_HOSTDEAD: |
384 | case PRC_HOSTUNREACH: | |
8e189bed KS |
385 | sns = (struct sockaddr_ns *)arg; |
386 | if (sns->sns_family != AF_NS) | |
387 | return; | |
388 | na = &sns->sns_addr; | |
4258e601 KS |
389 | break; |
390 | ||
391 | default: | |
fe594349 KS |
392 | errp = (struct ns_errp *)arg; |
393 | na = &errp->ns_err_idp.idp_dna; | |
394 | type = errp->ns_err_num; | |
f97be0c9 | 395 | type = ntohs((u_short)type); |
4258e601 KS |
396 | } |
397 | switch (type) { | |
9ad31c34 | 398 | |
4258e601 | 399 | case NS_ERR_UNREACH_HOST: |
fe594349 | 400 | ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0); |
4258e601 | 401 | break; |
9ad31c34 | 402 | |
4258e601 | 403 | case NS_ERR_TOO_BIG: |
fe594349 KS |
404 | case NS_ERR_NOSOCK: |
405 | nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port, | |
406 | NS_WILDCARD); | |
407 | if (nsp) { | |
408 | if(nsp->nsp_pcb) | |
f97be0c9 KS |
409 | (void) spp_drop((struct sppcb *)nsp->nsp_pcb, |
410 | (int)nsctlerrmap[cmd]); | |
fe594349 | 411 | else |
f97be0c9 | 412 | (void) idp_drop(nsp, (int)nsctlerrmap[cmd]); |
fe594349 | 413 | } |
4258e601 KS |
414 | } |
415 | } | |
416 | ||
f97be0c9 | 417 | #ifdef notdef |
4258e601 KS |
418 | int |
419 | spp_fixmtu(nsp) | |
420 | register struct nspcb *nsp; | |
421 | { | |
422 | register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb); | |
423 | register struct mbuf *m; | |
424 | register struct spidp *si; | |
425 | struct ns_errp *ep; | |
426 | struct sockbuf *sb; | |
427 | int badseq, len; | |
428 | struct mbuf *firstbad, *m0; | |
429 | ||
430 | if (cb) { | |
431 | /* | |
432 | * The notification that we have sent | |
433 | * too much is bad news -- we will | |
434 | * have to go through queued up so far | |
435 | * splitting ones which are too big and | |
436 | * reassigning sequence numbers and checksums. | |
437 | * we should then retransmit all packets from | |
438 | * one above the offending packet to the last one | |
439 | * we had sent (or our allocation) | |
440 | * then the offending one so that the any queued | |
441 | * data at our destination will be discarded. | |
442 | */ | |
443 | ep = (struct ns_errp *)nsp->nsp_notify_param; | |
444 | sb = &nsp->nsp_socket->so_snd; | |
445 | cb->s_mtu = ep->ns_err_param; | |
446 | badseq = SI(&ep->ns_err_idp)->si_seq; | |
447 | for (m = sb->sb_mb; m; m = m->m_act) { | |
448 | si = mtod(m, struct spidp *); | |
449 | if (si->si_seq == badseq) | |
450 | break; | |
451 | } | |
99e0091e | 452 | if (m == 0) return; |
4258e601 KS |
453 | firstbad = m; |
454 | /*for (;;) {*/ | |
455 | /* calculate length */ | |
456 | for (m0 = m, len = 0; m ; m = m->m_next) | |
457 | len += m->m_len; | |
458 | if (len > cb->s_mtu) { | |
459 | } | |
460 | /* FINISH THIS | |
461 | } */ | |
462 | } | |
463 | } | |
f97be0c9 | 464 | #endif |
4258e601 KS |
465 | |
466 | int spp_output_cnt = 0; | |
fe594349 | 467 | |
4258e601 KS |
468 | spp_output(cb, m0) |
469 | register struct sppcb *cb; | |
470 | struct mbuf *m0; | |
471 | { | |
472 | struct socket *so = cb->s_nspcb->nsp_socket; | |
473 | register struct mbuf *m; | |
474 | register struct spidp *si = (struct spidp *) 0; | |
475 | register struct sockbuf *sb = &(so->so_snd); | |
476 | register int len = 0; | |
99e0091e KS |
477 | int error = 0; |
478 | u_short lookfor = 0; | |
4258e601 KS |
479 | struct mbuf *mprev; |
480 | extern int idpcksum; | |
481 | ||
99e0091e | 482 | if (m0) { |
8e189bed KS |
483 | int mtu = cb->s_mtu; |
484 | int datalen; | |
485 | /* | |
486 | * Make sure that packet isn't too big. | |
487 | */ | |
4258e601 KS |
488 | for (m = m0; m ; m = m->m_next) { |
489 | mprev = m; | |
490 | len += m->m_len; | |
491 | } | |
8e189bed KS |
492 | datalen = (cb->s_flags & SF_HO) ? |
493 | len - sizeof (struct sphdr) : len; | |
494 | if (datalen > mtu) { | |
4258e601 KS |
495 | if (cb->s_flags & SF_PI) { |
496 | m_freem(m0); | |
9ad31c34 | 497 | return (EMSGSIZE); |
4258e601 KS |
498 | } else { |
499 | int off = 0; | |
8e189bed KS |
500 | int oldEM = cb->s_cc & SP_EM; |
501 | ||
502 | cb->s_cc &= ~SP_EM; | |
4258e601 KS |
503 | while (len > mtu) { |
504 | m = m_copy(m0, off, mtu); | |
99e0091e | 505 | if (m == NULL) { |
8e189bed KS |
506 | error = ENOBUFS; |
507 | goto bad_copy; | |
9ad31c34 | 508 | } |
4258e601 KS |
509 | error = spp_output(cb, m); |
510 | if (error) { | |
8e189bed KS |
511 | bad_copy: |
512 | cb->s_cc |= oldEM; | |
4258e601 | 513 | m_freem(m0); |
8e189bed | 514 | return(error); |
4258e601 KS |
515 | } |
516 | m_adj(m0, mtu); | |
517 | len -= mtu; | |
518 | } | |
8e189bed | 519 | cb->s_cc |= oldEM; |
4258e601 KS |
520 | } |
521 | } | |
99e0091e KS |
522 | /* |
523 | * Force length even, by adding a "garbage byte" if | |
524 | * necessary. | |
525 | */ | |
4258e601 | 526 | if (len & 1) { |
fe594349 | 527 | m = mprev; |
99e0091e | 528 | if (m->m_len + m->m_off < MMAXOFF) |
4258e601 | 529 | m->m_len++; |
99e0091e | 530 | else { |
4258e601 KS |
531 | struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA); |
532 | ||
533 | if (m1 == 0) { | |
534 | m_freem(m0); | |
535 | return (ENOBUFS); | |
536 | } | |
537 | m1->m_len = 1; | |
538 | m1->m_off = MMAXOFF - 1; | |
99e0091e | 539 | m->m_next = m1; |
4258e601 KS |
540 | } |
541 | } | |
542 | m = m_get(M_DONTWAIT, MT_HEADER); | |
543 | if (m == 0) { | |
544 | m_freem(m0); | |
9ad31c34 | 545 | return (ENOBUFS); |
4258e601 | 546 | } |
4258e601 KS |
547 | /* |
548 | * Fill in mbuf with extended SP header | |
549 | * and addresses and length put into network format. | |
550 | */ | |
551 | m->m_off = MMAXOFF - sizeof (struct spidp); | |
552 | m->m_len = sizeof (struct spidp); | |
553 | m->m_next = m0; | |
554 | si = mtod(m, struct spidp *); | |
555 | *si = cb->s_shdr; | |
556 | if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) { | |
99e0091e KS |
557 | register struct sphdr *sh; |
558 | if (m0->m_len < sizeof (*sh)) { | |
559 | if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) { | |
560 | (void) m_free(m); | |
561 | m_freem(m0); | |
562 | return (EINVAL); | |
563 | } | |
564 | m->m_next = m0; | |
565 | } | |
566 | sh = mtod(m0, struct sphdr *); | |
4258e601 KS |
567 | si->si_dt = sh->sp_dt; |
568 | si->si_cc |= sh->sp_cc & SP_EM; | |
569 | m0->m_len -= sizeof (*sh); | |
570 | m0->m_off += sizeof (*sh); | |
571 | len -= sizeof (*sh); | |
572 | } | |
573 | len += sizeof(*si); | |
fe594349 KS |
574 | if (cb->s_oobflags & SF_SOOB) { |
575 | /* | |
576 | * Per jqj@cornell: | |
577 | * make sure OB packets convey exactly 1 byte. | |
578 | * If the packet is 1 byte or larger, we | |
579 | * have already guaranted there to be at least | |
580 | * one garbage byte for the checksum, and | |
581 | * extra bytes shouldn't hurt! | |
fe594349 KS |
582 | */ |
583 | if (len > sizeof(*si)) { | |
584 | si->si_cc |= SP_OB; | |
585 | len = (1 + sizeof(*si)); | |
586 | } | |
587 | } | |
f97be0c9 | 588 | si->si_len = htons((u_short)len); |
4258e601 KS |
589 | /* |
590 | * queue stuff up for output | |
591 | */ | |
592 | sbappendrecord(sb,m); | |
593 | cb->s_seq++; | |
594 | } | |
4258e601 KS |
595 | /* |
596 | * update window | |
597 | */ | |
598 | { | |
f97be0c9 | 599 | register struct sockbuf *sb2 = &so->so_rcv; |
d8e9f818 KS |
600 | int credit = ((sb2->sb_mbmax - sb2->sb_mbcnt) / |
601 | ((short)cb->s_mtu)); | |
602 | int alo = cb->s_ack + (credit > 0 ? credit : 0) - 1; | |
603 | ||
604 | if (cb->s_alo < alo) { | |
605 | /* If the amount we are raising the window | |
606 | is more than his remaining headroom, tell | |
607 | him about it. In particular, if he is at | |
608 | his limit, any amount at all will do! */ | |
609 | u_short raise = alo - cb->s_alo; | |
610 | u_short headroom = 1 + cb->s_alo - cb->s_ack; | |
611 | ||
612 | if(SSEQ_LT(headroom, raise)) | |
613 | cb->s_flags |= SF_AK; | |
99e0091e | 614 | cb->s_alo = alo; |
d8e9f818 | 615 | } |
4258e601 KS |
616 | } |
617 | ||
618 | if (cb->s_oobflags & SF_SOOB) { | |
619 | /* | |
620 | * must transmit this out of band packet | |
621 | */ | |
622 | cb->s_oobflags &= ~ SF_SOOB; | |
623 | } else { | |
624 | /* | |
625 | * Decide what to transmit: | |
626 | * If we have a new packet, send that | |
627 | * (So long as it is in our allocation) | |
628 | * If it is time to retransmit a packet, | |
629 | * send that. | |
630 | * Otherwise, see if it time to bang on them | |
631 | * to ask for our current allocation. | |
632 | */ | |
633 | if (SSEQ_LT(cb->s_snt, cb->s_ralo)) | |
634 | lookfor = cb->s_snt + 1; | |
99e0091e | 635 | else if (cb->s_force == (1+TCPT_REXMT)) { |
4258e601 KS |
636 | lookfor = cb->s_rack; |
637 | } else if (SSEQ_LT(cb->s_ralo, cb->s_seq)) { | |
638 | lookfor = 0; | |
99e0091e | 639 | if (cb->s_timer[TCPT_PERSIST] == 0) { |
4258e601 | 640 | spp_setpersist(cb); |
99e0091e | 641 | /* tcp has cb->s_rxtshift = 0; here */ |
4258e601 KS |
642 | } |
643 | } | |
644 | m = sb->sb_mb; | |
99e0091e | 645 | while (m) { |
4258e601 KS |
646 | si = mtod(m, struct spidp *); |
647 | m = m->m_act; | |
648 | if (SSEQ_LT(si->si_seq, cb->s_rack)) { | |
649 | if ((sb->sb_flags & SB_WAIT) | |
650 | || so->so_snd.sb_sel) | |
651 | sowwakeup(so); | |
652 | sbdroprecord(sb); | |
653 | si = 0; | |
654 | continue; | |
655 | } | |
656 | if (SSEQ_LT(si->si_seq, lookfor)) | |
657 | continue; | |
658 | break; | |
659 | } | |
99e0091e KS |
660 | if (si && (si->si_seq != lookfor)) |
661 | si = 0; | |
4258e601 KS |
662 | } |
663 | cb->s_want = lookfor; | |
664 | ||
665 | if (si) { | |
666 | /* | |
667 | * must make a copy of this packet for | |
668 | * idp_output to monkey with | |
669 | */ | |
99e0091e KS |
670 | m = m_copy(dtom(si), 0, (int)M_COPYALL); |
671 | if (m == NULL) | |
9ad31c34 KS |
672 | return (ENOBUFS); |
673 | m0 = m; | |
4258e601 KS |
674 | si = mtod(m, struct spidp *); |
675 | } else if (cb->s_force || cb->s_flags & SF_AK) { | |
676 | /* | |
677 | * Must send an acknowledgement or a probe | |
678 | */ | |
679 | m = m_get(M_DONTWAIT, MT_HEADER); | |
680 | if (m == 0) | |
9ad31c34 | 681 | return (ENOBUFS); |
4258e601 KS |
682 | /* |
683 | * Fill in mbuf with extended SP header | |
684 | * and addresses and length put into network format. | |
685 | */ | |
686 | m->m_off = MMAXOFF - sizeof (struct spidp); | |
687 | m->m_len = sizeof (*si); | |
688 | m->m_next = 0; | |
689 | si = mtod(m, struct spidp *); | |
690 | *si = cb->s_shdr; | |
691 | si->si_seq = cb->s_snt + 1; | |
fe594349 | 692 | si->si_len = htons(sizeof (*si)); |
4258e601 KS |
693 | si->si_cc |= SP_SP; |
694 | cb->s_flags &= ~SF_AK; | |
695 | } | |
696 | /* | |
697 | * Stuff checksum and output datagram. | |
698 | */ | |
699 | if (si) { | |
700 | /* | |
701 | * If we are almost out of allocation | |
702 | * or one of the timers has gone off | |
703 | * request an ack. | |
704 | */ | |
99e0091e | 705 | if (SSEQ_GEQ(cb->s_seq, cb->s_ralo)) |
4258e601 KS |
706 | si->si_cc |= SP_SA; |
707 | if (cb->s_force) { | |
708 | si->si_cc |= SP_SA; | |
709 | cb->s_force = 0; | |
710 | } | |
99e0091e KS |
711 | /* |
712 | * If this is a new packet (and not a system packet), | |
fe594349 KS |
713 | * and we are not currently timing anything, |
714 | * time this one and ask for an ack. | |
4258e601 | 715 | */ |
99e0091e | 716 | if (SSEQ_LT(cb->s_snt, si->si_seq) && (!(si->si_cc & SP_SP))) { |
4258e601 | 717 | cb->s_snt = si->si_seq; |
99e0091e | 718 | if (cb->s_rtt == 0) { |
4258e601 KS |
719 | cb->s_rtseq = si->si_seq; |
720 | cb->s_rtt = 1; | |
721 | si->si_cc |= SP_SA; | |
722 | } | |
723 | /* | |
724 | * If the retransmit timer has not been set | |
725 | * and this is a real packet | |
726 | * then start the retransmit timer | |
727 | */ | |
99e0091e | 728 | if (cb->s_timer[TCPT_REXMT] == 0) { |
4258e601 KS |
729 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], |
730 | tcp_beta * cb->s_srtt, TCPTV_MIN, | |
731 | TCPTV_MAX); | |
732 | cb->s_rxtshift = 0; | |
733 | } | |
734 | } | |
735 | si->si_seq = htons(si->si_seq); | |
736 | si->si_alo = htons(cb->s_alo); | |
737 | si->si_ack = htons(cb->s_ack); | |
738 | ||
739 | if (idpcksum) { | |
740 | si->si_sum = 0; | |
fe594349 | 741 | len = ntohs(si->si_len); |
99e0091e KS |
742 | if (len & 1) |
743 | len++; | |
4258e601 KS |
744 | si->si_sum = ns_cksum(dtom(si), len); |
745 | } else | |
746 | si->si_sum = 0xffff; | |
747 | ||
748 | if (so->so_options & SO_DEBUG || traceallspps) | |
749 | spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); | |
750 | spp_output_cnt++; | |
751 | if (so->so_options & SO_DONTROUTE) | |
752 | error = ns_output(m, (struct route *)0, NS_ROUTETOIF); | |
753 | else | |
754 | error = ns_output(m, &cb->s_nspcb->nsp_route, 0); | |
755 | if (traceallspps && sppconsdebug) { | |
756 | printf("spp_out: %x\n", error); | |
757 | } | |
9ad31c34 | 758 | return (error); |
4258e601 KS |
759 | } |
760 | if (so->so_options & SO_DEBUG || traceallspps) | |
761 | spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0); | |
9ad31c34 | 762 | return (error); |
4258e601 KS |
763 | } |
764 | ||
765 | /*ARGSUSED*/ | |
766 | spp_ctloutput(req, so, level, name, value) | |
767 | int req; | |
768 | struct socket *so; | |
769 | int name; | |
770 | struct mbuf **value; | |
771 | { | |
772 | register struct mbuf *m; | |
773 | struct nspcb *nsp = sotonspcb(so); | |
774 | register struct sppcb *cb; | |
775 | int mask, error = 0; | |
776 | ||
777 | if (level != NSPROTO_SPP) { | |
778 | /* This will have to be changed when we do more general | |
779 | stacking of protocols */ | |
9ad31c34 | 780 | return (idp_ctloutput(req, so, level, name, value)); |
4258e601 KS |
781 | } |
782 | if (nsp == NULL) { | |
783 | error = EINVAL; | |
784 | goto release; | |
785 | } else | |
786 | cb = nstosppcb(nsp); | |
787 | ||
788 | switch (req) { | |
9ad31c34 | 789 | |
4258e601 | 790 | case PRCO_GETOPT: |
99e0091e | 791 | if (value == NULL) |
9ad31c34 | 792 | return (EINVAL); |
4258e601 | 793 | m = m_get(M_DONTWAIT, MT_DATA); |
99e0091e | 794 | if (m == NULL) |
9ad31c34 | 795 | return (ENOBUFS); |
4258e601 | 796 | switch (name) { |
9ad31c34 | 797 | |
4258e601 KS |
798 | case SO_HEADERS_ON_INPUT: |
799 | mask = SF_HI; | |
800 | goto get_flags; | |
9ad31c34 | 801 | |
4258e601 KS |
802 | case SO_HEADERS_ON_OUTPUT: |
803 | mask = SF_HO; | |
804 | get_flags: | |
805 | m->m_len = sizeof(short); | |
806 | m->m_off = MMAXOFF - sizeof(short); | |
807 | *mtod(m, short *) = cb->s_flags & mask; | |
808 | break; | |
9ad31c34 | 809 | |
8e189bed KS |
810 | case SO_MTU: |
811 | m->m_len = sizeof(u_short); | |
812 | m->m_off = MMAXOFF - sizeof(short); | |
813 | *mtod(m, short *) = cb->s_mtu; | |
814 | break; | |
815 | ||
4258e601 KS |
816 | case SO_LAST_HEADER: |
817 | m->m_len = sizeof(struct sphdr); | |
818 | m->m_off = MMAXOFF - sizeof(struct sphdr); | |
819 | *mtod(m, struct sphdr *) = cb->s_rhdr; | |
820 | break; | |
9ad31c34 | 821 | |
4258e601 KS |
822 | case SO_DEFAULT_HEADERS: |
823 | m->m_len = sizeof(struct spidp); | |
824 | m->m_off = MMAXOFF - sizeof(struct sphdr); | |
825 | *mtod(m, struct sphdr *) = cb->s_shdr.si_s; | |
826 | } | |
827 | *value = m; | |
828 | break; | |
9ad31c34 | 829 | |
4258e601 | 830 | case PRCO_SETOPT: |
8e189bed KS |
831 | if (value == 0 || *value == 0) { |
832 | error = EINVAL; | |
833 | break; | |
834 | } | |
4258e601 | 835 | switch (name) { |
f97be0c9 | 836 | int *ok; |
4258e601 KS |
837 | |
838 | case SO_HEADERS_ON_INPUT: | |
839 | mask = SF_HI; | |
840 | goto set_head; | |
9ad31c34 | 841 | |
4258e601 KS |
842 | case SO_HEADERS_ON_OUTPUT: |
843 | mask = SF_HO; | |
844 | set_head: | |
8e189bed | 845 | if (cb->s_flags & SF_PI) { |
4258e601 KS |
846 | ok = mtod(*value, int *); |
847 | if (*ok) | |
848 | cb->s_flags |= mask; | |
849 | else | |
850 | cb->s_flags &= ~mask; | |
851 | } else error = EINVAL; | |
852 | break; | |
9ad31c34 | 853 | |
8e189bed KS |
854 | case SO_MTU: |
855 | cb->s_mtu = *(mtod(*value, u_short *)); | |
856 | break; | |
857 | ||
4258e601 KS |
858 | case SO_DEFAULT_HEADERS: |
859 | { | |
860 | register struct sphdr *sp | |
861 | = mtod(*value, struct sphdr *); | |
862 | cb->s_dt = sp->sp_dt; | |
863 | cb->s_cc = sp->sp_cc & SP_EM; | |
864 | } | |
865 | } | |
8e189bed | 866 | m_freem(*value); |
4258e601 KS |
867 | break; |
868 | } | |
869 | release: | |
9ad31c34 | 870 | return (error); |
4258e601 KS |
871 | } |
872 | ||
873 | /*ARGSUSED*/ | |
874 | spp_usrreq(so, req, m, nam, rights) | |
875 | struct socket *so; | |
876 | int req; | |
877 | struct mbuf *m, *nam, *rights; | |
878 | { | |
879 | struct nspcb *nsp = sotonspcb(so); | |
880 | register struct sppcb *cb; | |
881 | int s = splnet(); | |
882 | int error = 0, ostate; | |
883 | ||
884 | if (req == PRU_CONTROL) | |
885 | return (ns_control(so, (int)m, (caddr_t)nam, | |
886 | (struct ifnet *)rights)); | |
887 | if (rights && rights->m_len) { | |
888 | error = EINVAL; | |
889 | goto release; | |
890 | } | |
891 | if (nsp == NULL) { | |
892 | if (req != PRU_ATTACH) { | |
893 | error = EINVAL; | |
894 | goto release; | |
895 | } | |
896 | } else | |
897 | cb = nstosppcb(nsp); | |
898 | ||
899 | ostate = cb ? cb->s_state : 0; | |
900 | ||
901 | switch (req) { | |
9ad31c34 | 902 | |
4258e601 KS |
903 | case PRU_ATTACH: |
904 | if (nsp != NULL) { | |
905 | error = EISCONN; | |
906 | break; | |
907 | } | |
908 | error = ns_pcballoc(so, &nspcb); | |
909 | if (error) | |
910 | break; | |
911 | error = soreserve(so, 2048, 2048); | |
912 | if (error) | |
913 | break; | |
914 | nsp = sotonspcb(so); | |
915 | { | |
916 | struct mbuf *mm = m_getclr(M_DONTWAIT,MT_PCB); | |
917 | ||
99e0091e | 918 | if (mm == NULL) { |
4258e601 KS |
919 | error = ENOBUFS; |
920 | break; | |
921 | } | |
922 | cb = mtod(mm, struct sppcb *); | |
923 | cb->s_state = TCPS_LISTEN; | |
4258e601 KS |
924 | cb->s_snt = -1; |
925 | cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q; | |
926 | cb->s_nspcb = nsp; | |
927 | nsp->nsp_pcb = (caddr_t) cb; | |
928 | } | |
929 | break; | |
930 | ||
931 | case PRU_DETACH: | |
932 | if (nsp == NULL) { | |
933 | error = ENOTCONN; | |
934 | break; | |
935 | } | |
936 | if (cb->s_state > TCPS_LISTEN) | |
937 | cb = spp_disconnect(cb); | |
938 | else | |
939 | cb = spp_close(cb); | |
940 | break; | |
941 | ||
942 | case PRU_BIND: | |
943 | error = ns_pcbbind(nsp, nam); | |
944 | break; | |
945 | ||
946 | case PRU_LISTEN: | |
947 | if (nsp->nsp_lport == 0) | |
948 | error = ns_pcbbind(nsp, (struct mbuf *)0); | |
949 | if (error == 0) | |
950 | cb->s_state = TCPS_LISTEN; | |
951 | break; | |
952 | ||
953 | /* | |
954 | * Initiate connection to peer. | |
955 | * Enter SYN_SENT state, and mark socket as connecting. | |
956 | * Start keep-alive timer, setup prototype header, | |
957 | * Send initial system packet requesting connection. | |
958 | */ | |
959 | case PRU_CONNECT: | |
960 | if (nsp->nsp_lport == 0) { | |
961 | error = ns_pcbbind(nsp, (struct mbuf *)0); | |
962 | if (error) | |
963 | break; | |
964 | } | |
965 | error = ns_pcbconnect(nsp, nam); | |
966 | if (error) | |
967 | break; | |
968 | soisconnecting(so); | |
969 | cb->s_state = TCPS_SYN_SENT; | |
970 | cb->s_did = 0; | |
971 | spp_template(cb); | |
972 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
973 | cb->s_force = 1 + TCPTV_KEEP; | |
974 | /* | |
975 | * Other party is required to respond to | |
976 | * the port I send from, but he is not | |
977 | * required to answer from where I am sending to, | |
978 | * so allow wildcarding. | |
979 | * original port I am sending to is still saved in | |
980 | * cb->s_dport. | |
981 | */ | |
982 | nsp->nsp_fport = 0; | |
983 | error = spp_output(cb, (struct mbuf *) 0); | |
984 | break; | |
985 | ||
986 | case PRU_CONNECT2: | |
987 | error = EOPNOTSUPP; | |
988 | break; | |
989 | ||
990 | /* | |
991 | * We may decide later to implement connection closing | |
992 | * handshaking at the spp level optionally. | |
993 | * here is the hook to do it: | |
994 | */ | |
995 | case PRU_DISCONNECT: | |
996 | cb = spp_disconnect(cb); | |
997 | break; | |
998 | ||
999 | /* | |
1000 | * Accept a connection. Essentially all the work is | |
1001 | * done at higher levels; just return the address | |
1002 | * of the peer, storing through addr. | |
1003 | */ | |
1004 | case PRU_ACCEPT: { | |
1005 | struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *); | |
1006 | ||
1007 | nam->m_len = sizeof (struct sockaddr_ns); | |
1008 | sns->sns_family = AF_NS; | |
1009 | sns->sns_addr = nsp->nsp_faddr; | |
1010 | break; | |
1011 | } | |
1012 | ||
1013 | case PRU_SHUTDOWN: | |
1014 | socantsendmore(so); | |
1015 | cb = spp_usrclosed(cb); | |
1016 | if (cb) | |
1017 | error = spp_output(cb, (struct mbuf *) 0); | |
1018 | break; | |
1019 | ||
1020 | /* | |
1021 | * After a receive, possibly send acknowledgment | |
1022 | * updating allocation. | |
1023 | */ | |
1024 | case PRU_RCVD: | |
1025 | (void) spp_output(cb, (struct mbuf *) 0); | |
1026 | break; | |
1027 | ||
1028 | case PRU_SEND: | |
1029 | error = spp_output(cb, m); | |
1030 | m = NULL; | |
1031 | break; | |
1032 | ||
1033 | case PRU_ABORT: | |
f97be0c9 | 1034 | (void) spp_drop(cb, ECONNABORTED); |
4258e601 KS |
1035 | break; |
1036 | ||
1037 | case PRU_SENSE: | |
1038 | case PRU_CONTROL: | |
1039 | m = NULL; | |
1040 | error = EOPNOTSUPP; | |
1041 | break; | |
1042 | ||
1043 | case PRU_RCVOOB: | |
d8e9f818 KS |
1044 | if (so->so_oobmark == 0 && |
1045 | (so->so_state & SS_RCVATMARK) == 0) { | |
1046 | error = EINVAL; | |
1047 | break; | |
1048 | } | |
4258e601 KS |
1049 | if ( ! (cb->s_oobflags & SF_IOOB) ) { |
1050 | error = EWOULDBLOCK; | |
1051 | break; | |
1052 | } | |
1053 | m->m_len = 1; | |
1054 | *mtod(m, caddr_t) = cb->s_iobc; | |
d8e9f818 KS |
1055 | if (((int)nam & MSG_PEEK) == 0) |
1056 | cb->s_oobflags &= ~ SF_IOOB; | |
4258e601 KS |
1057 | break; |
1058 | ||
1059 | case PRU_SENDOOB: | |
1060 | if (sbspace(&so->so_snd) < -512) { | |
1061 | m_freem(m); | |
1062 | error = ENOBUFS; | |
1063 | break; | |
1064 | } | |
1065 | cb->s_oobflags |= SF_SOOB; | |
1066 | error = spp_output(cb, m); | |
1067 | m = NULL; | |
1068 | cb->s_oobflags &= ~SF_SOOB; | |
1069 | break; | |
1070 | ||
1071 | case PRU_SOCKADDR: | |
1072 | ns_setsockaddr(nsp, nam); | |
1073 | break; | |
1074 | ||
1075 | case PRU_PEERADDR: | |
1076 | ns_setpeeraddr(nsp, nam); | |
1077 | break; | |
1078 | ||
1079 | case PRU_SLOWTIMO: | |
1080 | cb = spp_timers(cb, (int)nam); | |
1081 | break; | |
1082 | ||
1083 | case PRU_FASTTIMO: | |
1084 | case PRU_PROTORCV: | |
1085 | case PRU_PROTOSEND: | |
1086 | error = EOPNOTSUPP; | |
1087 | break; | |
1088 | ||
1089 | default: | |
1090 | panic("sp_usrreq"); | |
1091 | } | |
1092 | if (cb && (so->so_options & SO_DEBUG || traceallspps)) | |
f97be0c9 | 1093 | spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req); |
4258e601 KS |
1094 | release: |
1095 | if (m != NULL) | |
1096 | m_freem(m); | |
1097 | splx(s); | |
1098 | return (error); | |
1099 | } | |
1100 | ||
1101 | spp_usrreq_sp(so, req, m, nam, rights) | |
1102 | struct socket *so; | |
1103 | int req; | |
1104 | struct mbuf *m, *nam, *rights; | |
1105 | { | |
1106 | int error = spp_usrreq(so, req, m, nam, rights); | |
1107 | ||
99e0091e | 1108 | if (req == PRU_ATTACH && error == 0) { |
4258e601 KS |
1109 | struct nspcb *nsp = sotonspcb(so); |
1110 | ((struct sppcb *)nsp->nsp_pcb)->s_flags |= | |
1111 | (SF_HI | SF_HO | SF_PI); | |
1112 | } | |
9ad31c34 | 1113 | return (error); |
4258e601 KS |
1114 | } |
1115 | ||
1116 | /* | |
1117 | * Create template to be used to send spp packets on a connection. | |
1118 | * Called after host entry created, fills | |
1119 | * in a skeletal spp header (choosing connection id), | |
1120 | * minimizing the amount of work necessary when the connection is used. | |
1121 | */ | |
1122 | spp_template(cb) | |
1123 | struct sppcb *cb; | |
1124 | { | |
1125 | register struct nspcb *nsp = cb->s_nspcb; | |
1126 | register struct spidp *n = &(cb->s_shdr); | |
1127 | ||
8e189bed | 1128 | cb->s_mtu = 576 - sizeof (struct spidp); |
4258e601 KS |
1129 | n->si_pt = NSPROTO_SPP; |
1130 | n->si_sna = nsp->nsp_laddr; | |
1131 | n->si_dna = nsp->nsp_faddr; | |
1132 | n->si_sid = htons(spp_iss); | |
1133 | spp_iss += SPP_ISSINCR/2; | |
1134 | n->si_alo = 1; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Close a SPIP control block: | |
1139 | * discard spp control block itself | |
1140 | * discard ns protocol control block | |
1141 | * wake up any sleepers | |
1142 | */ | |
1143 | struct sppcb * | |
1144 | spp_close(cb) | |
1145 | register struct sppcb *cb; | |
1146 | { | |
1147 | register struct spidp_q *s; | |
1148 | struct nspcb *nsp = cb->s_nspcb; | |
1149 | struct socket *so = nsp->nsp_socket; | |
1150 | register struct mbuf *m; | |
1151 | ||
1152 | s = cb->s_q.si_next; | |
1153 | while (s != &(cb->s_q)) { | |
1154 | s = s->si_next; | |
1155 | m = dtom(s->si_prev); | |
1156 | remque(s->si_prev); | |
1157 | m_freem(m); | |
1158 | } | |
1159 | (void) m_free(dtom(cb)); | |
1160 | nsp->nsp_pcb = 0; | |
1161 | soisdisconnected(so); | |
1162 | ns_pcbdetach(nsp); | |
9ad31c34 | 1163 | return ((struct sppcb *)0); |
4258e601 KS |
1164 | } |
1165 | /* | |
1166 | * Someday we may do level 3 handshaking | |
1167 | * to close a connection or send a xerox style error. | |
1168 | * For now, just close. | |
1169 | */ | |
1170 | struct sppcb * | |
1171 | spp_usrclosed(cb) | |
1172 | register struct sppcb *cb; | |
1173 | { | |
9ad31c34 | 1174 | return (spp_close(cb)); |
4258e601 KS |
1175 | } |
1176 | struct sppcb * | |
1177 | spp_disconnect(cb) | |
1178 | register struct sppcb *cb; | |
1179 | { | |
9ad31c34 | 1180 | return (spp_close(cb)); |
4258e601 KS |
1181 | } |
1182 | /* | |
1183 | * Drop connection, reporting | |
1184 | * the specified error. | |
1185 | */ | |
1186 | struct sppcb * | |
1187 | spp_drop(cb, errno) | |
1188 | register struct sppcb *cb; | |
1189 | int errno; | |
1190 | { | |
1191 | struct socket *so = cb->s_nspcb->nsp_socket; | |
1192 | ||
1193 | /* | |
1194 | * someday, in the xerox world | |
1195 | * we will generate error protocol packets | |
1196 | * announcing that the socket has gone away. | |
1197 | */ | |
1198 | /*if (TCPS_HAVERCVDSYN(tp->t_state)) { | |
1199 | tp->t_state = TCPS_CLOSED; | |
1200 | (void) tcp_output(tp); | |
1201 | }*/ | |
1202 | so->so_error = errno; | |
1203 | return (spp_close(cb)); | |
1204 | } | |
1205 | ||
1206 | spp_abort(nsp) | |
1207 | struct nspcb *nsp; | |
1208 | { | |
1209 | ||
f97be0c9 | 1210 | (void) spp_close((struct sppcb *)nsp->nsp_pcb); |
4258e601 KS |
1211 | } |
1212 | ||
1213 | spp_setpersist(cb) | |
1214 | register struct sppcb *cb; | |
1215 | { | |
1216 | ||
1217 | /*if (cb->s_timer[TCPT_REXMT]) | |
1218 | panic("spp_output REXMT");*/ | |
1219 | /* | |
1220 | * Start/restart persistance timer. | |
1221 | */ | |
1222 | TCPT_RANGESET(cb->s_timer[TCPT_PERSIST], | |
1223 | ((int)(tcp_beta * cb->s_srtt)) << cb->s_rxtshift, | |
1224 | TCPTV_PERSMIN, TCPTV_MAX); | |
1225 | cb->s_rxtshift++; | |
1226 | if (cb->s_rxtshift >= TCP_MAXRXTSHIFT) | |
1227 | cb->s_rxtshift = 0; | |
1228 | } | |
1229 | /* | |
1230 | * Fast timeout routine for processing delayed acks | |
1231 | */ | |
1232 | int spp_ftcnt; | |
1233 | spp_fasttimo() | |
1234 | { | |
1235 | register struct nspcb *nsp; | |
1236 | register struct sppcb *cb; | |
1237 | int s = splnet(); | |
1238 | ||
1239 | nsp = nspcb.nsp_next; | |
1240 | spp_ftcnt++; | |
1241 | if (nsp) | |
1242 | for (; nsp != &nspcb; nsp = nsp->nsp_next) | |
1243 | if ((cb = (struct sppcb *)nsp->nsp_pcb) && | |
1244 | (cb->s_flags & SF_DELACK)) { | |
1245 | cb->s_flags &= ~SF_DELACK; | |
1246 | cb->s_flags |= SF_AK; | |
1247 | (void) spp_output(cb, (struct mbuf *) 0); | |
1248 | } | |
1249 | splx(s); | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * spp protocol timeout routine called every 500 ms. | |
1254 | * Updates the timers in all active pcb's and | |
1255 | * causes finite state machine actions if timers expire. | |
1256 | */ | |
1257 | spp_slowtimo() | |
1258 | { | |
1259 | register struct nspcb *ip, *ipnxt; | |
1260 | register struct sppcb *cb; | |
1261 | int s = splnet(); | |
1262 | register int i; | |
1263 | ||
1264 | /* | |
1265 | * Search through tcb's and update active timers. | |
1266 | */ | |
1267 | ip = nspcb.nsp_next; | |
1268 | if (ip == 0) { | |
1269 | splx(s); | |
1270 | return; | |
1271 | } | |
1272 | while (ip != &nspcb) { | |
1273 | cb = nstosppcb(ip); | |
1274 | ipnxt = ip->nsp_next; | |
1275 | if (cb == 0) | |
1276 | goto tpgone; | |
1277 | for (i = 0; i < TCPT_NTIMERS; i++) { | |
1278 | if (cb->s_timer[i] && --cb->s_timer[i] == 0) { | |
1279 | (void) spp_usrreq(cb->s_nspcb->nsp_socket, | |
1280 | PRU_SLOWTIMO, (struct mbuf *)0, | |
1281 | (struct mbuf *)i, (struct mbuf *)0); | |
1282 | if (ipnxt->nsp_prev != ip) | |
1283 | goto tpgone; | |
1284 | } | |
1285 | } | |
1286 | cb->s_idle++; | |
1287 | if (cb->s_rtt) | |
1288 | cb->s_rtt++; | |
1289 | tpgone: | |
1290 | ip = ipnxt; | |
1291 | } | |
1292 | spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */ | |
1293 | splx(s); | |
1294 | } | |
1295 | ||
1296 | float spp_backoff[TCP_MAXRXTSHIFT] = | |
1297 | { 1.0, 1.2, 1.4, 1.7, 2.0, 3.0, 5.0, 8.0, 16.0, 32.0 }; | |
a5c5bc2d | 1298 | int sppexprexmtbackoff = 0; |
4258e601 | 1299 | /* |
8e189bed | 1300 | * SPP timer processing. |
4258e601 KS |
1301 | */ |
1302 | struct sppcb * | |
1303 | spp_timers(cb, timer) | |
1304 | register struct sppcb *cb; | |
1305 | int timer; | |
1306 | { | |
1307 | ||
1308 | cb->s_force = 1 + timer; | |
1309 | switch (timer) { | |
1310 | ||
1311 | /* | |
1312 | * 2 MSL timeout in shutdown went off. Delete connection | |
1313 | * control block. | |
1314 | */ | |
1315 | case TCPT_2MSL: | |
1316 | cb = spp_close(cb); | |
1317 | break; | |
1318 | ||
1319 | /* | |
1320 | * Retransmission timer went off. Message has not | |
1321 | * been acked within retransmit interval. Back off | |
1322 | * to a longer retransmit interval and retransmit all | |
1323 | * unacknowledged messages in the window. | |
1324 | */ | |
1325 | case TCPT_REXMT: | |
1326 | cb->s_rxtshift++; | |
1327 | if (cb->s_rxtshift > TCP_MAXRXTSHIFT) { | |
1328 | cb = spp_drop(cb, ETIMEDOUT); | |
1329 | break; | |
1330 | } | |
1331 | (void) spp_output(cb, (struct mbuf *) 0); | |
1332 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], | |
1333 | (int)cb->s_srtt, TCPTV_MIN, TCPTV_MAX); | |
a5c5bc2d | 1334 | if (sppexprexmtbackoff) { |
4258e601 KS |
1335 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], |
1336 | cb->s_timer[TCPT_REXMT] << cb->s_rxtshift, | |
1337 | TCPTV_MIN, TCPTV_MAX); | |
1338 | } else { | |
1339 | TCPT_RANGESET(cb->s_timer[TCPT_REXMT], | |
1340 | cb->s_timer[TCPT_REXMT] * | |
1341 | spp_backoff[cb->s_rxtshift - 1], | |
1342 | TCPTV_MIN, TCPTV_MAX); | |
1343 | } | |
1344 | break; | |
1345 | ||
1346 | /* | |
1347 | * Persistance timer into zero window. | |
1348 | * Force a probe to be sent. | |
1349 | */ | |
1350 | case TCPT_PERSIST: | |
1351 | (void) spp_output(cb, (struct mbuf *) 0); | |
1352 | spp_setpersist(cb); | |
1353 | break; | |
1354 | ||
1355 | /* | |
1356 | * Keep-alive timer went off; send something | |
1357 | * or drop connection if idle for too long. | |
1358 | */ | |
1359 | case TCPT_KEEP: | |
1360 | if (cb->s_state < TCPS_ESTABLISHED) | |
1361 | goto dropit; | |
1362 | if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) { | |
1363 | if (cb->s_idle >= TCPTV_MAXIDLE) | |
1364 | goto dropit; | |
1365 | (void) spp_output(cb, (struct mbuf *) 0); | |
1366 | } else | |
1367 | cb->s_idle = 0; | |
1368 | cb->s_timer[TCPT_KEEP] = TCPTV_KEEP; | |
1369 | break; | |
1370 | dropit: | |
1371 | cb = spp_drop(cb, ETIMEDOUT); | |
1372 | break; | |
1373 | } | |
1374 | return (cb); | |
1375 | } |