Commit | Line | Data |
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51386eb2 KS |
1 | /* |
2 | * Copyright (c) University of British Columbia, 1984 | |
3 | * Copyright (c) 1990 The Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * the Laboratory for Computation Vision and the Computer Science Department | |
8 | * of the University of British Columbia. | |
9 | * | |
10 | * %sccs.include.redist.c% | |
11 | * | |
480398a9 | 12 | * @(#)pk_subr.c 7.12 (Berkeley) %G% |
51386eb2 | 13 | */ |
6567c660 | 14 | |
039be508 KS |
15 | #include "param.h" |
16 | #include "systm.h" | |
17 | #include "mbuf.h" | |
18 | #include "socket.h" | |
19 | #include "protosw.h" | |
20 | #include "socketvar.h" | |
21 | #include "errno.h" | |
22 | #include "time.h" | |
23 | #include "kernel.h" | |
24 | ||
ffababe5 KS |
25 | #include "../net/if.h" |
26 | ||
039be508 KS |
27 | #include "x25.h" |
28 | #include "pk.h" | |
29 | #include "pk_var.h" | |
30 | #include "x25err.h" | |
6567c660 KS |
31 | |
32 | int pk_sendspace = 1024 * 2 + 8; | |
33 | int pk_recvspace = 1024 * 2 + 8; | |
34 | ||
32f30cd6 KS |
35 | struct pklcd_q pklcd_q = {&pklcd_q, &pklcd_q}; |
36 | ||
6567c660 KS |
37 | /* |
38 | * Attach X.25 protocol to socket, allocate logical channel descripter | |
39 | * and buffer space, and enter LISTEN state if we are to accept | |
40 | * IN-COMMING CALL packets. | |
41 | * | |
42 | */ | |
43 | ||
ffababe5 | 44 | struct pklcd * |
6567c660 KS |
45 | pk_attach (so) |
46 | struct socket *so; | |
47 | { | |
48 | register struct pklcd *lcp; | |
ffababe5 | 49 | register int error = ENOBUFS; |
480398a9 | 50 | int pk_output(); |
6567c660 | 51 | |
32f30cd6 | 52 | MALLOC(lcp, struct pklcd *, sizeof (*lcp), M_PCB, M_NOWAIT); |
ffababe5 | 53 | if (lcp) { |
32f30cd6 KS |
54 | bzero ((caddr_t)lcp, sizeof (*lcp)); |
55 | insque (&lcp -> lcd_q, &pklcd_q); | |
ffababe5 KS |
56 | if (so) { |
57 | error = soreserve (so, pk_sendspace, pk_recvspace); | |
ffababe5 KS |
58 | lcp -> lcd_so = so; |
59 | if (so -> so_options & SO_ACCEPTCONN) | |
60 | lcp -> lcd_state = LISTEN; | |
61 | else | |
62 | lcp -> lcd_state = READY; | |
b84e7ca8 | 63 | } else |
4507dea2 | 64 | sbreserve (&lcp -> lcd_sb, pk_sendspace); |
ffababe5 KS |
65 | } |
66 | if (so) { | |
67 | so -> so_pcb = (caddr_t) lcp; | |
68 | so -> so_error = error; | |
69 | } | |
480398a9 | 70 | lcp -> lcd_send = pk_output; |
ffababe5 | 71 | return (lcp); |
6567c660 KS |
72 | } |
73 | ||
74 | /* | |
75 | * Disconnect X.25 protocol from socket. | |
76 | */ | |
77 | ||
78 | pk_disconnect (lcp) | |
79 | register struct pklcd *lcp; | |
80 | { | |
81 | register struct socket *so = lcp -> lcd_so; | |
82 | register struct pklcd *l, *p; | |
83 | ||
84 | switch (lcp -> lcd_state) { | |
85 | case LISTEN: | |
86 | for (p = 0, l = pk_listenhead; l && l != lcp; p = l, l = l -> lcd_listen); | |
87 | if (p == 0) { | |
88 | if (l != 0) | |
89 | pk_listenhead = l -> lcd_listen; | |
90 | } | |
91 | else | |
92 | if (l != 0) | |
93 | p -> lcd_listen = l -> lcd_listen; | |
94 | pk_close (lcp); | |
95 | break; | |
96 | ||
97 | case READY: | |
98 | pk_acct (lcp); | |
99 | pk_close (lcp); | |
100 | break; | |
101 | ||
102 | case SENT_CLEAR: | |
103 | case RECEIVED_CLEAR: | |
104 | break; | |
105 | ||
106 | default: | |
107 | pk_acct (lcp); | |
039be508 KS |
108 | if (so) { |
109 | soisdisconnecting (so); | |
110 | sbflush (&so -> so_rcv); | |
111 | } | |
c4b47c42 | 112 | pk_clear (lcp, 241, 0); /* Normal Disconnect */ |
6567c660 KS |
113 | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * Close an X.25 Logical Channel. Discard all space held by the | |
119 | * connection and internal descriptors. Wake up any sleepers. | |
120 | */ | |
121 | ||
122 | pk_close (lcp) | |
123 | struct pklcd *lcp; | |
124 | { | |
125 | register struct socket *so = lcp -> lcd_so; | |
126 | ||
127 | pk_freelcd (lcp); | |
128 | ||
129 | if (so == NULL) | |
130 | return; | |
131 | ||
132 | so -> so_pcb = 0; | |
6567c660 | 133 | soisdisconnected (so); |
c4b47c42 | 134 | /* sofree (so); /* gak!!! you can't do that here */ |
6567c660 KS |
135 | } |
136 | ||
137 | /* | |
138 | * Create a template to be used to send X.25 packets on a logical | |
139 | * channel. It allocates an mbuf and fills in a skeletal packet | |
140 | * depending on its type. This packet is passed to pk_output where | |
141 | * the remainer of the packet is filled in. | |
142 | */ | |
143 | ||
c4b47c42 | 144 | struct mbuf * |
6567c660 KS |
145 | pk_template (lcn, type) |
146 | int lcn, type; | |
147 | { | |
148 | register struct mbuf *m; | |
149 | register struct x25_packet *xp; | |
150 | ||
1c41f5e9 | 151 | MGETHDR (m, M_DONTWAIT, MT_HEADER); |
6567c660 KS |
152 | if (m == 0) |
153 | panic ("pk_template"); | |
154 | m -> m_act = 0; | |
155 | ||
156 | /* | |
157 | * Efficiency hack: leave a four byte gap at the beginning | |
158 | * of the packet level header with the hope that this will | |
159 | * be enough room for the link level to insert its header. | |
160 | */ | |
1c41f5e9 | 161 | m -> m_data += max_linkhdr; |
6567c660 KS |
162 | m -> m_len = PKHEADERLN; |
163 | ||
164 | xp = mtod (m, struct x25_packet *); | |
165 | *(long *)xp = 0; /* ugly, but fast */ | |
166 | /* xp -> q_bit = 0;*/ | |
167 | xp -> fmt_identifier = 1; | |
168 | /* xp -> lc_group_number = 0;*/ | |
169 | ||
9a1afe6f | 170 | SET_LCN(xp, lcn); |
6567c660 KS |
171 | xp -> packet_type = type; |
172 | ||
c4b47c42 | 173 | return (m); |
6567c660 KS |
174 | } |
175 | ||
176 | /* | |
177 | * This routine restarts all the virtual circuits. Actually, | |
178 | * the virtual circuits are not "restarted" as such. Instead, | |
179 | * any active switched circuit is simply returned to READY | |
180 | * state. | |
181 | */ | |
182 | ||
183 | pk_restart (pkp, restart_cause) | |
184 | register struct pkcb *pkp; | |
185 | int restart_cause; | |
186 | { | |
c4b47c42 | 187 | register struct mbuf *m; |
6567c660 KS |
188 | register struct pklcd *lcp; |
189 | register int i; | |
190 | ||
191 | /* Restart all logical channels. */ | |
1c41f5e9 | 192 | if (pkp -> pk_chan == 0) |
039be508 | 193 | return; |
1c41f5e9 KS |
194 | for (i = 1; i <= pkp -> pk_maxlcn; ++i) |
195 | if ((lcp = pkp -> pk_chan[i]) != NULL) { | |
c4b47c42 | 196 | if (lcp -> lcd_so) { |
1c41f5e9 | 197 | lcp -> lcd_so -> so_error = ENETRESET; |
c4b47c42 KS |
198 | pk_close (lcp); |
199 | } else { | |
200 | pk_flush (lcp); | |
201 | lcp -> lcd_state = READY; | |
202 | if (lcp -> lcd_upper) | |
32f30cd6 | 203 | lcp -> lcd_upper (lcp, 0); |
c4b47c42 | 204 | } |
6567c660 KS |
205 | } |
206 | ||
207 | if (restart_cause < 0) | |
208 | return; | |
209 | ||
1c41f5e9 KS |
210 | pkp -> pk_state = DTE_SENT_RESTART; |
211 | lcp = pkp -> pk_chan[0]; | |
c4b47c42 KS |
212 | m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESTART); |
213 | m -> m_len += 2; | |
32f30cd6 KS |
214 | mtod (m, struct x25_packet *) -> packet_data = 0; /* DTE only */ |
215 | mtod (m, octet *)[4] = restart_cause; | |
6567c660 KS |
216 | pk_output (lcp); |
217 | } | |
218 | ||
219 | ||
220 | /* | |
221 | * This procedure frees up the Logical Channel Descripter. | |
222 | */ | |
223 | ||
6567c660 KS |
224 | pk_freelcd (lcp) |
225 | register struct pklcd *lcp; | |
226 | { | |
227 | if (lcp == NULL) | |
228 | return; | |
229 | ||
6567c660 KS |
230 | if (lcp -> lcd_lcn > 0) |
231 | lcp -> lcd_pkp -> pk_chan[lcp -> lcd_lcn] = NULL; | |
232 | ||
32f30cd6 KS |
233 | pk_flush (lcp); |
234 | remque (&lcp -> lcd_q); | |
235 | free ((caddr_t)lcp, M_PCB); | |
6567c660 KS |
236 | } |
237 | ||
238 | ||
239 | /* | |
240 | * Bind a address and protocol value to a socket. The important | |
241 | * part is the protocol value - the first four characters of the | |
242 | * Call User Data field. | |
243 | */ | |
244 | ||
245 | pk_bind (lcp, nam) | |
246 | struct pklcd *lcp; | |
247 | struct mbuf *nam; | |
248 | { | |
6567c660 | 249 | register struct pkcb *pkp; |
6567c660 | 250 | register struct pklcd *pp; |
ffababe5 | 251 | register struct sockaddr_x25 *sa; |
6567c660 KS |
252 | |
253 | if (nam == NULL) | |
254 | return (EADDRNOTAVAIL); | |
255 | if (lcp -> lcd_ceaddr) /* XXX */ | |
256 | return (EADDRINUSE); | |
c4b47c42 | 257 | if (pk_checksockaddr (nam)) |
6567c660 KS |
258 | return (EINVAL); |
259 | sa = mtod (nam, struct sockaddr_x25 *); | |
260 | ||
261 | /* | |
262 | * If the user wishes to accept calls only from a particular | |
263 | * net (net != 0), make sure the net is known | |
264 | */ | |
265 | ||
266 | if (sa -> x25_net) | |
267 | for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { | |
268 | if (pkp == 0) | |
269 | return (ENETUNREACH); | |
4507dea2 | 270 | if (pkp -> pk_xcp -> xc_addr.x25_net == sa -> x25_net) |
6567c660 KS |
271 | break; |
272 | } | |
273 | ||
c4b47c42 KS |
274 | /* |
275 | * For ISO's sake permit default listeners, but only one such . . . | |
276 | */ | |
277 | for (pp = pk_listenhead; pp; pp = pp -> lcd_listen) { | |
278 | register struct sockaddr_x25 *sa2 = pp -> lcd_ceaddr; | |
279 | if ((sa2 -> x25_udlen == sa -> x25_udlen) && | |
280 | (sa2 -> x25_udlen == 0 || | |
281 | (bcmp (sa2 -> x25_udata, sa -> x25_udata, | |
282 | min (sa2 -> x25_udlen, sa -> x25_udlen)) == 0))) | |
283 | return (EADDRINUSE); | |
284 | } | |
ffababe5 KS |
285 | lcp -> lcd_laddr = *sa; |
286 | lcp -> lcd_ceaddr = &lcp -> lcd_laddr; | |
6567c660 KS |
287 | return (0); |
288 | } | |
289 | ||
c4b47c42 KS |
290 | /* |
291 | * Include a bound control block in the list of listeners. | |
292 | */ | |
293 | pk_listen (lcp) | |
294 | register struct pklcd *lcp; | |
295 | { | |
296 | register struct pklcd **pp; | |
297 | ||
298 | if (lcp -> lcd_ceaddr == 0) | |
299 | return (EDESTADDRREQ); | |
300 | ||
301 | lcp -> lcd_state = LISTEN; | |
302 | /* | |
303 | * Add default listener at end, any others at start. | |
304 | */ | |
305 | if (lcp -> lcd_ceaddr -> x25_udlen == 0) { | |
306 | for (pp = &pk_listenhead; *pp; ) | |
307 | pp = &((*pp) -> lcd_listen); | |
308 | *pp = lcp; | |
309 | } else { | |
310 | lcp -> lcd_listen = pk_listenhead; | |
311 | pk_listenhead = lcp; | |
312 | } | |
313 | return (0); | |
314 | } | |
315 | /* | |
316 | * Include a listening control block for the benefit of other protocols. | |
317 | */ | |
318 | pk_protolisten (spi, spilen, callee) | |
32f30cd6 | 319 | int (*callee) (); |
c4b47c42 KS |
320 | { |
321 | register struct pklcd *lcp = pk_attach ((struct socket *)0); | |
322 | register struct mbuf *nam; | |
323 | register struct sockaddr_x25 *sa; | |
324 | int error = ENOBUFS; | |
325 | ||
326 | if (lcp) { | |
32f30cd6 KS |
327 | if (nam = m_getclr (MT_SONAME, M_DONTWAIT)) { |
328 | sa = mtod (nam, struct sockaddr_x25 *); | |
c4b47c42 KS |
329 | sa -> x25_family = AF_CCITT; |
330 | sa -> x25_len = nam -> m_len = sizeof (*sa); | |
331 | sa -> x25_udlen = spilen; | |
332 | sa -> x25_udata[0] = spi; | |
333 | lcp -> lcd_upper = callee; | |
334 | lcp -> lcd_flags = X25_MBS_HOLD; | |
335 | error = pk_bind (lcp, nam) || pk_listen (lcp); | |
336 | (void) m_free (nam); | |
337 | } | |
338 | if (error) | |
32f30cd6 | 339 | pk_freelcd (lcp); |
c4b47c42 KS |
340 | } |
341 | return error; /* Hopefully Zero !*/ | |
342 | } | |
343 | ||
6567c660 KS |
344 | /* |
345 | * Associate a logical channel descriptor with a network. | |
346 | * Fill in the default network specific parameters and then | |
347 | * set any parameters explicitly specified by the user or | |
348 | * by the remote DTE. | |
349 | */ | |
350 | ||
351 | pk_assoc (pkp, lcp, sa) | |
352 | register struct pkcb *pkp; | |
353 | register struct pklcd *lcp; | |
354 | register struct sockaddr_x25 *sa; | |
355 | { | |
356 | ||
357 | lcp -> lcd_pkp = pkp; | |
358 | lcp -> lcd_packetsize = pkp -> pk_xcp -> xc_psize; | |
359 | lcp -> lcd_windowsize = pkp -> pk_xcp -> xc_pwsize; | |
360 | lcp -> lcd_rsn = MODULUS - 1; | |
361 | pkp -> pk_chan[lcp -> lcd_lcn] = lcp; | |
362 | ||
363 | if (sa -> x25_opts.op_psize) | |
364 | lcp -> lcd_packetsize = sa -> x25_opts.op_psize; | |
365 | else | |
366 | sa -> x25_opts.op_psize = lcp -> lcd_packetsize; | |
367 | if (sa -> x25_opts.op_wsize) | |
368 | lcp -> lcd_windowsize = sa -> x25_opts.op_wsize; | |
369 | else | |
370 | sa -> x25_opts.op_wsize = lcp -> lcd_windowsize; | |
4507dea2 | 371 | sa -> x25_net = pkp -> pk_xcp -> xc_addr.x25_net; |
6567c660 KS |
372 | lcp -> lcd_flags = sa -> x25_opts.op_flags; |
373 | lcp -> lcd_stime = time.tv_sec; | |
374 | } | |
375 | ||
c4b47c42 | 376 | pk_connect (lcp, sa) |
6567c660 | 377 | register struct pklcd *lcp; |
ffababe5 | 378 | register struct sockaddr_x25 *sa; |
6567c660 KS |
379 | { |
380 | register struct pkcb *pkp; | |
6567c660 | 381 | |
6567c660 KS |
382 | if (sa -> x25_addr[0] == '\0') |
383 | return (EDESTADDRREQ); | |
1c41f5e9 KS |
384 | if (lcp -> lcd_pkp == 0) |
385 | for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { | |
6567c660 KS |
386 | if (pkp == 0) |
387 | return (ENETUNREACH); | |
388 | /* | |
389 | * use first net configured (last in list | |
390 | * headed by pkcbhead) if net is zero | |
391 | */ | |
392 | if (sa -> x25_net == 0 && pkp -> pk_next == 0) | |
393 | break; | |
4507dea2 | 394 | if (sa -> x25_net == pkp -> pk_xcp -> xc_addr.x25_net) |
6567c660 KS |
395 | break; |
396 | } | |
397 | ||
398 | if (pkp -> pk_state != DTE_READY) | |
399 | return (ENETDOWN); | |
400 | if ((lcp -> lcd_lcn = pk_getlcn (pkp)) == 0) | |
401 | return (EMFILE); | |
ffababe5 | 402 | lcp -> lcd_faddr = *sa; |
1c41f5e9 | 403 | lcp -> lcd_ceaddr = & lcp -> lcd_faddr; |
6567c660 | 404 | pk_assoc (pkp, lcp, lcp -> lcd_ceaddr); |
4507dea2 | 405 | if (lcp -> lcd_so) |
039be508 | 406 | soisconnecting (lcp -> lcd_so); |
6567c660 | 407 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CALL); |
ffababe5 | 408 | pk_callrequest (lcp, lcp -> lcd_ceaddr, pkp -> pk_xcp); |
32f30cd6 | 409 | return (*pkp -> pk_start) (lcp); |
6567c660 KS |
410 | } |
411 | ||
412 | /* | |
413 | * Build the rest of the CALL REQUEST packet. Fill in calling | |
414 | * address, facilities fields and the user data field. | |
415 | */ | |
416 | ||
ffababe5 | 417 | pk_callrequest (lcp, sa, xcp) |
6567c660 | 418 | struct pklcd *lcp; |
ffababe5 | 419 | register struct sockaddr_x25 *sa; |
6567c660 KS |
420 | register struct x25config *xcp; |
421 | { | |
422 | register struct x25_calladdr *a; | |
c4b47c42 | 423 | register struct mbuf *m = lcp -> lcd_template; |
32f30cd6 | 424 | register struct x25_packet *xp = mtod (m, struct x25_packet *); |
6567c660 KS |
425 | unsigned posn = 0; |
426 | octet *cp; | |
6567c660 | 427 | |
9a1afe6f | 428 | if (lcp -> lcd_flags & X25_DBIT) |
c4b47c42 KS |
429 | xp -> d_bit = 1; |
430 | a = (struct x25_calladdr *) &xp -> packet_data; | |
4507dea2 | 431 | a -> calling_addrlen = strlen (xcp -> xc_addr.x25_addr); |
6567c660 KS |
432 | a -> called_addrlen = strlen (sa -> x25_addr); |
433 | cp = (octet *) a -> address_field; | |
434 | to_bcd (&cp, (int)a -> called_addrlen, sa -> x25_addr, &posn); | |
4507dea2 | 435 | to_bcd (&cp, (int)a -> calling_addrlen, xcp -> xc_addr.x25_addr, &posn); |
6567c660 KS |
436 | if (posn & 0x01) |
437 | *cp++ &= 0xf0; | |
6567c660 KS |
438 | m -> m_len += cp - (octet *) a; |
439 | ||
c4b47c42 | 440 | if (lcp -> lcd_facilities) { |
32f30cd6 KS |
441 | m -> m_pkthdr.len += |
442 | (m -> m_next = lcp -> lcd_facilities) -> m_len; | |
c4b47c42 | 443 | lcp -> lcd_facilities = 0; |
c4b47c42 KS |
444 | } else |
445 | build_facilities (m, sa, (int)xcp -> xc_type); | |
446 | ||
32f30cd6 | 447 | m_copyback (m, m -> m_pkthdr.len, sa -> x25_udlen, sa -> x25_udata); |
6567c660 KS |
448 | #ifdef ANDREW |
449 | printf ("call: "); | |
1c41f5e9 | 450 | for (cp = mtod (m, octet *), posn = 0; posn < m -> m_len; ++posn) |
6567c660 KS |
451 | printf ("%x ", *cp++); |
452 | printf ("\n"); | |
453 | #endif | |
454 | } | |
455 | ||
32f30cd6 | 456 | static |
c4b47c42 KS |
457 | build_facilities (m, sa, type) |
458 | register struct mbuf *m; | |
6567c660 KS |
459 | struct sockaddr_x25 *sa; |
460 | { | |
c4b47c42 | 461 | register octet *cp; |
6567c660 KS |
462 | register octet *fcp; |
463 | register int revcharge; | |
464 | ||
32f30cd6 | 465 | cp = mtod (m, octet *) + m -> m_len; |
c4b47c42 | 466 | fcp = cp + 1; |
6567c660 KS |
467 | revcharge = sa -> x25_opts.op_flags & X25_REVERSE_CHARGE ? 1 : 0; |
468 | /* | |
469 | * This is specific to Datapac X.25(1976) DTEs. International | |
470 | * calls must have the "hi priority" bit on. | |
471 | */ | |
472 | if (type == X25_1976 && sa -> x25_opts.op_psize == X25_PS128) | |
473 | revcharge |= 02; | |
474 | if (revcharge) { | |
475 | *fcp++ = FACILITIES_REVERSE_CHARGE; | |
476 | *fcp++ = revcharge; | |
477 | } | |
478 | switch (type) { | |
479 | case X25_1980: | |
480 | case X25_1984: | |
481 | *fcp++ = FACILITIES_PACKETSIZE; | |
482 | *fcp++ = sa -> x25_opts.op_psize; | |
483 | *fcp++ = sa -> x25_opts.op_psize; | |
484 | ||
485 | *fcp++ = FACILITIES_WINDOWSIZE; | |
486 | *fcp++ = sa -> x25_opts.op_wsize; | |
487 | *fcp++ = sa -> x25_opts.op_wsize; | |
488 | } | |
c4b47c42 KS |
489 | *cp = fcp - cp - 1; |
490 | m -> m_pkthdr.len = (m -> m_len += *cp + 1); | |
6567c660 KS |
491 | } |
492 | ||
493 | to_bcd (a, len, x, posn) | |
494 | register octet **a; | |
495 | register char *x; | |
496 | register int len; | |
497 | register unsigned *posn; | |
498 | { | |
499 | while (--len >= 0) | |
500 | if ((*posn)++ & 0x01) | |
501 | *(*a)++ |= *x++ & 0x0F; | |
502 | else | |
503 | **a = *x++ << 4; | |
504 | } | |
505 | ||
506 | /* | |
507 | * This routine gets the first available logical channel number. The | |
508 | * search is from the highest number to lowest number (DTE). | |
509 | */ | |
510 | ||
511 | pk_getlcn (pkp) | |
512 | register struct pkcb *pkp; | |
513 | { | |
514 | register int i; | |
515 | ||
1c41f5e9 | 516 | if (pkp -> pk_chan == 0) |
039be508 | 517 | return (0); |
6567c660 KS |
518 | for (i = pkp -> pk_maxlcn; i > 0; --i) |
519 | if (pkp -> pk_chan[i] == NULL) | |
520 | break; | |
521 | return (i); | |
522 | ||
523 | } | |
524 | ||
6567c660 KS |
525 | /* |
526 | * This procedure sends a CLEAR request packet. The lc state is | |
527 | * set to "SENT_CLEAR". | |
528 | */ | |
529 | ||
c4b47c42 KS |
530 | pk_clear (lcp, diagnostic, abortive) |
531 | register struct pklcd *lcp; | |
6567c660 | 532 | { |
c4b47c42 KS |
533 | register struct mbuf *m = pk_template (lcp -> lcd_lcn, X25_CLEAR); |
534 | ||
535 | m -> m_len += 2; | |
32f30cd6 KS |
536 | mtod (m, struct x25_packet *) -> packet_data = 0; |
537 | mtod (m, octet *)[4] = diagnostic; | |
c4b47c42 KS |
538 | if (lcp -> lcd_facilities) { |
539 | m -> m_next = lcp -> lcd_facilities; | |
540 | m -> m_pkthdr.len += m -> m_next -> m_len; | |
541 | lcp -> lcd_facilities = 0; | |
542 | } | |
543 | if (abortive) | |
544 | lcp -> lcd_template = m; | |
545 | else { | |
546 | struct socket *so = lcp -> lcd_so; | |
547 | struct sockbuf *sb = so ? & so -> so_snd : & lcp -> lcd_sb; | |
32f30cd6 | 548 | sbappendrecord (sb, m); |
c4b47c42 | 549 | } |
6567c660 KS |
550 | pk_output (lcp); |
551 | ||
552 | } | |
553 | ||
32f30cd6 KS |
554 | /* |
555 | * This procedure generates RNR's or RR's to inhibit or enable | |
556 | * inward data flow, if the current state changes (blocked ==> open or | |
557 | * vice versa), or if forced to generate one. One forces RNR's to ack data. | |
558 | */ | |
559 | pk_flowcontrol (lcp, inhibit, forced) | |
560 | register struct pklcd *lcp; | |
561 | { | |
562 | inhibit = (inhibit != 0); | |
563 | if (lcp == 0 || lcp -> lcd_state != DATA_TRANSFER || | |
564 | (forced == 0 && lcp -> lcd_rxrnr_condition == inhibit)) | |
565 | return; | |
566 | lcp -> lcd_rxrnr_condition = inhibit; | |
567 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, inhibit ? RNR : RR); | |
568 | pk_output (lcp); | |
569 | } | |
570 | ||
6567c660 | 571 | /* |
32f30cd6 | 572 | * This procedure sends a RESET request packet. It re-intializes |
6567c660 KS |
573 | * virtual circuit. |
574 | */ | |
575 | ||
576 | static | |
c4b47c42 | 577 | pk_reset (lcp, diagnostic) |
6567c660 KS |
578 | register struct pklcd *lcp; |
579 | { | |
c4b47c42 KS |
580 | register struct mbuf *m; |
581 | register struct socket *so = lcp -> lcd_so; | |
6567c660 KS |
582 | |
583 | if (lcp -> lcd_state != DATA_TRANSFER) | |
584 | return; | |
585 | ||
c4b47c42 KS |
586 | if (so) |
587 | so -> so_error = ECONNRESET; | |
6567c660 KS |
588 | lcp -> lcd_reset_condition = TRUE; |
589 | ||
590 | /* Reset all the control variables for the channel. */ | |
c4b47c42 | 591 | pk_flush (lcp); |
6567c660 KS |
592 | lcp -> lcd_window_condition = lcp -> lcd_rnr_condition = |
593 | lcp -> lcd_intrconf_pending = FALSE; | |
594 | lcp -> lcd_rsn = MODULUS - 1; | |
595 | lcp -> lcd_ssn = 0; | |
596 | lcp -> lcd_output_window = lcp -> lcd_input_window = | |
597 | lcp -> lcd_last_transmitted_pr = 0; | |
c4b47c42 KS |
598 | m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESET); |
599 | m -> m_len += 2; | |
32f30cd6 KS |
600 | mtod (m, struct x25_packet *) -> packet_data = 0; |
601 | mtod (m, octet *)[4] = diagnostic; | |
c4b47c42 KS |
602 | pk_output (lcp); |
603 | ||
604 | } | |
605 | ||
606 | /* | |
607 | * This procedure frees all data queued for output or delivery on a | |
608 | * virtual circuit. | |
609 | */ | |
610 | ||
611 | pk_flush (lcp) | |
612 | register struct pklcd *lcp; | |
613 | { | |
614 | register struct socket *so; | |
615 | ||
616 | if (lcp -> lcd_template) | |
617 | m_freem (lcp -> lcd_template); | |
618 | ||
619 | if (lcp -> lcd_cps) { | |
32f30cd6 | 620 | m_freem (lcp -> lcd_cps); |
c4b47c42 KS |
621 | lcp -> lcd_cps = 0; |
622 | } | |
32f30cd6 KS |
623 | if (lcp -> lcd_facilities) { |
624 | m_freem (lcp -> lcd_facilities); | |
625 | lcp -> lcd_facilities = 0; | |
626 | } | |
627 | if (so = lcp -> lcd_so) { | |
039be508 KS |
628 | sbflush (&so -> so_rcv); |
629 | sbflush (&so -> so_snd); | |
c4b47c42 KS |
630 | } else |
631 | sbflush (&lcp -> lcd_sb); | |
6567c660 KS |
632 | } |
633 | ||
6567c660 KS |
634 | /* |
635 | * This procedure handles all local protocol procedure errors. | |
636 | */ | |
637 | ||
c4b47c42 | 638 | pk_procerror (error, lcp, errstr, diagnostic) |
6567c660 KS |
639 | register struct pklcd *lcp; |
640 | char *errstr; | |
641 | { | |
642 | ||
643 | pk_message (lcp -> lcd_lcn, lcp -> lcd_pkp -> pk_xcp, errstr); | |
644 | ||
645 | switch (error) { | |
646 | case CLEAR: | |
1c41f5e9 KS |
647 | if (lcp -> lcd_so) { |
648 | lcp -> lcd_so -> so_error = ECONNABORTED; | |
649 | soisdisconnecting (lcp -> lcd_so); | |
6567c660 | 650 | } |
c4b47c42 | 651 | pk_clear (lcp, diagnostic, 1); |
6567c660 KS |
652 | break; |
653 | ||
654 | case RESET: | |
c4b47c42 | 655 | pk_reset (lcp, diagnostic); |
6567c660 KS |
656 | } |
657 | } | |
658 | ||
659 | /* | |
660 | * This procedure is called during the DATA TRANSFER state to check | |
661 | * and process the P(R) values received in the DATA, RR OR RNR | |
662 | * packets. | |
663 | */ | |
664 | ||
665 | pk_ack (lcp, pr) | |
666 | struct pklcd *lcp; | |
667 | unsigned pr; | |
668 | { | |
669 | register struct socket *so = lcp -> lcd_so; | |
670 | ||
671 | if (lcp -> lcd_output_window == pr) | |
672 | return (PACKET_OK); | |
673 | if (lcp -> lcd_output_window < lcp -> lcd_ssn) { | |
674 | if (pr < lcp -> lcd_output_window || pr > lcp -> lcd_ssn) { | |
c4b47c42 KS |
675 | pk_procerror (RESET, lcp, |
676 | "p(r) flow control error", 2); | |
6567c660 KS |
677 | return (ERROR_PACKET); |
678 | } | |
679 | } | |
680 | else { | |
681 | if (pr < lcp -> lcd_output_window && pr > lcp -> lcd_ssn) { | |
c4b47c42 | 682 | pk_procerror (RESET, lcp, |
32f30cd6 | 683 | "p(r) flow control error #2", 2); |
6567c660 KS |
684 | return (ERROR_PACKET); |
685 | } | |
686 | } | |
687 | ||
688 | lcp -> lcd_output_window = pr; /* Rotate window. */ | |
689 | if (lcp -> lcd_window_condition == TRUE) | |
690 | lcp -> lcd_window_condition = FALSE; | |
691 | ||
039be508 | 692 | if (so && ((so -> so_snd.sb_flags & SB_WAIT) || so -> so_snd.sb_sel)) |
6567c660 | 693 | sowwakeup (so); |
b84e7ca8 | 694 | if (lcp -> lcd_upper) |
32f30cd6 | 695 | (*lcp -> lcd_upper) (lcp, 0); |
6567c660 KS |
696 | |
697 | return (PACKET_OK); | |
698 | } | |
699 | ||
700 | /* | |
701 | * This procedure decodes the X.25 level 3 packet returning a | |
702 | * code to be used in switchs or arrays. | |
703 | */ | |
704 | ||
705 | pk_decode (xp) | |
706 | register struct x25_packet *xp; | |
707 | { | |
708 | register int type; | |
709 | ||
710 | if (xp -> fmt_identifier != 1) | |
711 | return (INVALID_PACKET); | |
c4b47c42 | 712 | #ifdef ancient_history |
6567c660 KS |
713 | /* |
714 | * Make sure that the logical channel group number is 0. | |
715 | * This restriction may be removed at some later date. | |
716 | */ | |
717 | if (xp -> lc_group_number != 0) | |
718 | return (INVALID_PACKET); | |
c4b47c42 | 719 | #endif |
6567c660 KS |
720 | /* |
721 | * Test for data packet first. | |
722 | */ | |
723 | if (!(xp -> packet_type & DATA_PACKET_DESIGNATOR)) | |
724 | return (DATA); | |
725 | ||
726 | /* | |
727 | * Test if flow control packet (RR or RNR). | |
728 | */ | |
729 | if (!(xp -> packet_type & RR_OR_RNR_PACKET_DESIGNATOR)) | |
32f30cd6 KS |
730 | switch (xp -> packet_type & 0x1f) { |
731 | case X25_RR: | |
6567c660 | 732 | return (RR); |
32f30cd6 | 733 | case X25_RNR: |
6567c660 | 734 | return (RNR); |
32f30cd6 KS |
735 | case X25_REJECT: |
736 | return (REJECT); | |
737 | } | |
6567c660 KS |
738 | |
739 | /* | |
740 | * Determine the rest of the packet types. | |
741 | */ | |
742 | switch (xp -> packet_type) { | |
743 | case X25_CALL: | |
744 | type = CALL; | |
745 | break; | |
746 | ||
747 | case X25_CALL_ACCEPTED: | |
748 | type = CALL_ACCEPTED; | |
749 | break; | |
750 | ||
751 | case X25_CLEAR: | |
752 | type = CLEAR; | |
753 | break; | |
754 | ||
755 | case X25_CLEAR_CONFIRM: | |
756 | type = CLEAR_CONF; | |
757 | break; | |
758 | ||
759 | case X25_INTERRUPT: | |
760 | type = INTERRUPT; | |
761 | break; | |
762 | ||
763 | case X25_INTERRUPT_CONFIRM: | |
764 | type = INTERRUPT_CONF; | |
765 | break; | |
766 | ||
767 | case X25_RESET: | |
768 | type = RESET; | |
769 | break; | |
770 | ||
771 | case X25_RESET_CONFIRM: | |
772 | type = RESET_CONF; | |
773 | break; | |
774 | ||
775 | case X25_RESTART: | |
776 | type = RESTART; | |
777 | break; | |
778 | ||
779 | case X25_RESTART_CONFIRM: | |
780 | type = RESTART_CONF; | |
781 | break; | |
782 | ||
32f30cd6 | 783 | case X25_DIAGNOSTIC: |
5336ccc3 | 784 | type = DIAG_TYPE; |
32f30cd6 KS |
785 | break; |
786 | ||
6567c660 KS |
787 | default: |
788 | type = INVALID_PACKET; | |
789 | } | |
790 | return (type); | |
791 | } | |
792 | ||
793 | /* | |
794 | * A restart packet has been received. Print out the reason | |
795 | * for the restart. | |
796 | */ | |
797 | ||
798 | pk_restartcause (pkp, xp) | |
799 | struct pkcb *pkp; | |
800 | register struct x25_packet *xp; | |
801 | { | |
802 | register struct x25config *xcp = pkp -> pk_xcp; | |
9a1afe6f | 803 | register int lcn = LCN(xp); |
6567c660 KS |
804 | |
805 | switch (xp -> packet_data) { | |
806 | case X25_RESTART_LOCAL_PROCEDURE_ERROR: | |
807 | pk_message (lcn, xcp, "restart: local procedure error"); | |
808 | break; | |
809 | ||
810 | case X25_RESTART_NETWORK_CONGESTION: | |
811 | pk_message (lcn, xcp, "restart: network congestion"); | |
812 | break; | |
813 | ||
814 | case X25_RESTART_NETWORK_OPERATIONAL: | |
815 | pk_message (lcn, xcp, "restart: network operational"); | |
816 | break; | |
817 | ||
818 | default: | |
819 | pk_message (lcn, xcp, "restart: unknown cause"); | |
820 | } | |
821 | } | |
822 | ||
823 | #define MAXRESETCAUSE 7 | |
824 | ||
825 | int Reset_cause[] = { | |
826 | EXRESET, EXROUT, 0, EXRRPE, 0, EXRLPE, 0, EXRNCG | |
827 | }; | |
828 | ||
829 | /* | |
830 | * A reset packet has arrived. Return the cause to the user. | |
831 | */ | |
832 | ||
833 | pk_resetcause (pkp, xp) | |
834 | struct pkcb *pkp; | |
835 | register struct x25_packet *xp; | |
836 | { | |
1c41f5e9 | 837 | register struct pklcd *lcp = |
9a1afe6f | 838 | pkp -> pk_chan[LCN(xp)]; |
6567c660 KS |
839 | register int code = xp -> packet_data; |
840 | ||
841 | if (code > MAXRESETCAUSE) | |
842 | code = 7; /* EXRNCG */ | |
843 | ||
32f30cd6 KS |
844 | pk_message(LCN(xp), lcp -> lcd_pkp, "reset code 0x%x, diagnostic 0x%x", |
845 | xp -> packet_data, 4[(u_char *)xp]); | |
846 | ||
1c41f5e9 | 847 | lcp -> lcd_so -> so_error = Reset_cause[code]; |
6567c660 KS |
848 | } |
849 | ||
850 | #define MAXCLEARCAUSE 25 | |
851 | ||
852 | int Clear_cause[] = { | |
853 | EXCLEAR, EXCBUSY, 0, EXCINV, 0, EXCNCG, 0, | |
854 | 0, 0, EXCOUT, 0, EXCAB, 0, EXCNOB, 0, 0, 0, EXCRPE, | |
855 | 0, EXCLPE, 0, 0, 0, 0, 0, EXCRRC | |
856 | }; | |
857 | ||
858 | /* | |
859 | * A clear packet has arrived. Return the cause to the user. | |
860 | */ | |
861 | ||
862 | pk_clearcause (pkp, xp) | |
863 | struct pkcb *pkp; | |
864 | register struct x25_packet *xp; | |
865 | { | |
1c41f5e9 | 866 | register struct pklcd *lcp = |
9a1afe6f | 867 | pkp -> pk_chan[LCN(xp)]; |
6567c660 KS |
868 | register int code = xp -> packet_data; |
869 | ||
870 | if (code > MAXCLEARCAUSE) | |
871 | code = 5; /* EXRNCG */ | |
1c41f5e9 | 872 | lcp -> lcd_so -> so_error = Clear_cause[code]; |
6567c660 KS |
873 | } |
874 | ||
875 | char * | |
876 | format_ntn (xcp) | |
877 | register struct x25config *xcp; | |
878 | { | |
4507dea2 KS |
879 | |
880 | return (xcp -> xc_addr.x25_addr); | |
6567c660 KS |
881 | } |
882 | ||
883 | /* VARARGS1 */ | |
884 | pk_message (lcn, xcp, fmt, a1, a2, a3, a4, a5, a6) | |
885 | struct x25config *xcp; | |
886 | char *fmt; | |
887 | { | |
888 | ||
889 | if (lcn) | |
890 | if (pkcbhead -> pk_next) | |
891 | printf ("X.25(%s): lcn %d: ", format_ntn (xcp), lcn); | |
892 | else | |
893 | printf ("X.25: lcn %d: ", lcn); | |
894 | else | |
895 | if (pkcbhead -> pk_next) | |
896 | printf ("X.25(%s): ", format_ntn (xcp)); | |
897 | else | |
898 | printf ("X.25: "); | |
899 | ||
900 | printf (fmt, a1, a2, a3, a4, a5, a6); | |
901 | printf ("\n"); | |
902 | } | |
1c41f5e9 | 903 | |
32f30cd6 | 904 | pk_ifattach (ia, lloutput, llnext) |
1c41f5e9 | 905 | register struct x25_ifaddr *ia; |
32f30cd6 | 906 | int (*lloutput) (); |
1c41f5e9 KS |
907 | caddr_t llnext; |
908 | { | |
909 | /* this is here because you can't include both pk_var and hd_var */ | |
910 | /* this will probably be replace by a streams gluing mechanism */ | |
911 | ia -> ia_pkcb.pk_lloutput = lloutput; | |
912 | ia -> ia_pkcb.pk_llnext = llnext; | |
913 | } | |
914 | ||
32f30cd6 | 915 | pk_fragment (lcp, m0, qbit, mbit, wait) |
1c41f5e9 KS |
916 | struct mbuf *m0; |
917 | register struct pklcd *lcp; | |
918 | { | |
919 | register struct mbuf *m = m0; | |
920 | register struct x25_packet *xp; | |
921 | register struct sockbuf *sb; | |
32f30cd6 | 922 | struct mbuf *head = 0, *next, **mp = &head, *m_split (); |
1c41f5e9 KS |
923 | int totlen, psize = 1 << (lcp -> lcd_packetsize); |
924 | ||
925 | if (m == 0) | |
926 | return; | |
c4b47c42 | 927 | if (m -> m_flags & M_PKTHDR == 0) |
32f30cd6 | 928 | panic ("pk_fragment"); |
1c41f5e9 | 929 | totlen = m -> m_pkthdr.len; |
9a1afe6f | 930 | m -> m_act = 0; |
1c41f5e9 KS |
931 | sb = lcp -> lcd_so ? &lcp -> lcd_so -> so_snd : & lcp -> lcd_sb; |
932 | do { | |
933 | if (totlen > psize) { | |
32f30cd6 | 934 | if ((next = m_split (m, psize, wait)) == 0) |
1c41f5e9 | 935 | goto abort; |
1c41f5e9 | 936 | totlen -= psize; |
9a1afe6f KS |
937 | } else |
938 | next = 0; | |
1c41f5e9 KS |
939 | M_PREPEND(m, PKHEADERLN, wait); |
940 | if (m == 0) | |
941 | goto abort; | |
9a1afe6f KS |
942 | *mp = m; |
943 | mp = & m -> m_act; | |
944 | *mp = 0; | |
32f30cd6 | 945 | xp = mtod (m, struct x25_packet *); |
1c41f5e9 KS |
946 | 0[(char *)xp] = 0; |
947 | if (qbit) | |
9a1afe6f KS |
948 | xp -> q_bit = 1; |
949 | if (lcp -> lcd_flags & X25_DBIT) | |
950 | xp -> d_bit = 1; | |
1c41f5e9 | 951 | xp -> fmt_identifier = 1; |
1c41f5e9 | 952 | xp -> packet_type = X25_DATA; |
9a1afe6f KS |
953 | SET_LCN(xp, lcp -> lcd_lcn); |
954 | if (next || (mbit && (totlen == psize || | |
955 | (lcp -> lcd_flags & X25_DBIT)))) | |
1c41f5e9 | 956 | MBIT(xp) = 1; |
1c41f5e9 | 957 | } while (m = next); |
9a1afe6f | 958 | for (m = head; m; m = next) { |
1c41f5e9 KS |
959 | next = m -> m_act; |
960 | m -> m_act = 0; | |
32f30cd6 | 961 | sbappendrecord (sb, m); |
1c41f5e9 KS |
962 | } |
963 | return 0; | |
964 | abort: | |
9a1afe6f | 965 | if (wait) |
32f30cd6 | 966 | panic ("pk_fragment null mbuf after wait"); |
9a1afe6f | 967 | if (next) |
32f30cd6 | 968 | m_freem (next); |
9a1afe6f | 969 | for (m = head; m; m = next) { |
1c41f5e9 | 970 | next = m -> m_act; |
32f30cd6 | 971 | m_freem (m); |
1c41f5e9 KS |
972 | } |
973 | return ENOBUFS; | |
974 | } | |
9a1afe6f KS |
975 | |
976 | struct mbuf * | |
32f30cd6 | 977 | m_split (m0, len0, wait) |
9a1afe6f KS |
978 | register struct mbuf *m0; |
979 | int len0; | |
980 | { | |
981 | register struct mbuf *m, *n; | |
982 | unsigned len = len0; | |
983 | ||
984 | for (m = m0; m && len > m -> m_len; m = m -> m_next) | |
985 | len -= m -> m_len; | |
986 | if (m == 0) | |
987 | return (0); | |
988 | if (m0 -> m_flags & M_PKTHDR) { | |
989 | MGETHDR(n, wait, m0 -> m_type); | |
990 | if (n == 0) | |
991 | return (0); | |
992 | n -> m_pkthdr.rcvif = m0 -> m_pkthdr.rcvif; | |
993 | n -> m_pkthdr.len = m0 -> m_pkthdr.len - len0; | |
994 | m0 -> m_pkthdr.len = len0; | |
995 | if (m -> m_flags & M_EXT) | |
996 | goto extpacket; | |
997 | if (len > MHLEN) { | |
998 | /* m can't be the lead packet */ | |
999 | MH_ALIGN(n, 0); | |
32f30cd6 | 1000 | n -> m_next = m_split (m, len, wait); |
9a1afe6f | 1001 | if (n -> m_next == 0) { |
32f30cd6 | 1002 | (void) m_free (n); |
9a1afe6f KS |
1003 | return (0); |
1004 | } else | |
1005 | return (n); | |
1006 | } else | |
1007 | MH_ALIGN(n, len); | |
1008 | } else if (len == m -> m_len) { | |
1009 | n = m -> m_next; | |
1010 | m -> m_next = 0; | |
1011 | return (n); | |
1012 | } | |
1013 | extpacket: | |
1014 | len = m -> m_len - len; /* remainder to be copied */ | |
1015 | m -> m_len -= len; /* now equals original len */ | |
c4b47c42 | 1016 | if (m -> m_flags & M_EXT) { |
9a1afe6f KS |
1017 | n -> m_flags |= M_EXT; |
1018 | n -> m_ext = m -> m_ext; | |
32f30cd6 | 1019 | mclrefcnt[mtocl (m -> m_ext.ext_buf)]++; |
9a1afe6f KS |
1020 | n -> m_data = m -> m_data + m -> m_len; |
1021 | } else { | |
1022 | MGET(n, wait, m -> m_type); | |
1023 | if (n == 0) { | |
1024 | m -> m_len += len; | |
1025 | return (0); | |
1026 | } | |
1027 | M_ALIGN(n, len); | |
32f30cd6 | 1028 | bcopy (mtod (m, caddr_t), mtod (n, caddr_t), len); |
9a1afe6f KS |
1029 | } |
1030 | n -> m_len = len; | |
1031 | n -> m_next = m -> m_next; | |
1032 | m -> m_next = 0; | |
1033 | return (n); | |
1034 | } |