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 | * | |
d0185972 | 12 | * @(#)pk_subr.c 7.19 (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); | |
822e810c KS |
56 | lcp -> lcd_state = READY; |
57 | lcp -> lcd_send = pk_output; | |
ffababe5 KS |
58 | if (so) { |
59 | error = soreserve (so, pk_sendspace, pk_recvspace); | |
ffababe5 KS |
60 | lcp -> lcd_so = so; |
61 | if (so -> so_options & SO_ACCEPTCONN) | |
62 | lcp -> lcd_state = LISTEN; | |
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 | } | |
70 | return (lcp); | |
6567c660 KS |
71 | } |
72 | ||
73 | /* | |
74 | * Disconnect X.25 protocol from socket. | |
75 | */ | |
76 | ||
77 | pk_disconnect (lcp) | |
78 | register struct pklcd *lcp; | |
79 | { | |
80 | register struct socket *so = lcp -> lcd_so; | |
81 | register struct pklcd *l, *p; | |
82 | ||
83 | switch (lcp -> lcd_state) { | |
84 | case LISTEN: | |
85 | for (p = 0, l = pk_listenhead; l && l != lcp; p = l, l = l -> lcd_listen); | |
86 | if (p == 0) { | |
87 | if (l != 0) | |
88 | pk_listenhead = l -> lcd_listen; | |
89 | } | |
90 | else | |
91 | if (l != 0) | |
92 | p -> lcd_listen = l -> lcd_listen; | |
93 | pk_close (lcp); | |
94 | break; | |
95 | ||
96 | case READY: | |
97 | pk_acct (lcp); | |
98 | pk_close (lcp); | |
99 | break; | |
100 | ||
101 | case SENT_CLEAR: | |
102 | case RECEIVED_CLEAR: | |
103 | break; | |
104 | ||
105 | default: | |
106 | pk_acct (lcp); | |
039be508 KS |
107 | if (so) { |
108 | soisdisconnecting (so); | |
109 | sbflush (&so -> so_rcv); | |
110 | } | |
c4b47c42 | 111 | pk_clear (lcp, 241, 0); /* Normal Disconnect */ |
6567c660 KS |
112 | |
113 | } | |
114 | } | |
115 | ||
116 | /* | |
117 | * Close an X.25 Logical Channel. Discard all space held by the | |
118 | * connection and internal descriptors. Wake up any sleepers. | |
119 | */ | |
120 | ||
121 | pk_close (lcp) | |
122 | struct pklcd *lcp; | |
123 | { | |
124 | register struct socket *so = lcp -> lcd_so; | |
125 | ||
126 | pk_freelcd (lcp); | |
127 | ||
128 | if (so == NULL) | |
129 | return; | |
130 | ||
131 | so -> so_pcb = 0; | |
6567c660 | 132 | soisdisconnected (so); |
c4b47c42 | 133 | /* sofree (so); /* gak!!! you can't do that here */ |
6567c660 KS |
134 | } |
135 | ||
136 | /* | |
137 | * Create a template to be used to send X.25 packets on a logical | |
138 | * channel. It allocates an mbuf and fills in a skeletal packet | |
139 | * depending on its type. This packet is passed to pk_output where | |
140 | * the remainer of the packet is filled in. | |
141 | */ | |
142 | ||
c4b47c42 | 143 | struct mbuf * |
6567c660 KS |
144 | pk_template (lcn, type) |
145 | int lcn, type; | |
146 | { | |
147 | register struct mbuf *m; | |
148 | register struct x25_packet *xp; | |
149 | ||
1c41f5e9 | 150 | MGETHDR (m, M_DONTWAIT, MT_HEADER); |
6567c660 KS |
151 | if (m == 0) |
152 | panic ("pk_template"); | |
153 | m -> m_act = 0; | |
154 | ||
155 | /* | |
156 | * Efficiency hack: leave a four byte gap at the beginning | |
157 | * of the packet level header with the hope that this will | |
158 | * be enough room for the link level to insert its header. | |
159 | */ | |
1c41f5e9 | 160 | m -> m_data += max_linkhdr; |
822e810c | 161 | m -> m_pkthdr.len = m -> m_len = PKHEADERLN; |
6567c660 KS |
162 | |
163 | xp = mtod (m, struct x25_packet *); | |
164 | *(long *)xp = 0; /* ugly, but fast */ | |
165 | /* xp -> q_bit = 0;*/ | |
166 | xp -> fmt_identifier = 1; | |
167 | /* xp -> lc_group_number = 0;*/ | |
168 | ||
9a1afe6f | 169 | SET_LCN(xp, lcn); |
6567c660 KS |
170 | xp -> packet_type = type; |
171 | ||
c4b47c42 | 172 | return (m); |
6567c660 KS |
173 | } |
174 | ||
175 | /* | |
176 | * This routine restarts all the virtual circuits. Actually, | |
177 | * the virtual circuits are not "restarted" as such. Instead, | |
178 | * any active switched circuit is simply returned to READY | |
179 | * state. | |
180 | */ | |
181 | ||
182 | pk_restart (pkp, restart_cause) | |
183 | register struct pkcb *pkp; | |
184 | int restart_cause; | |
185 | { | |
c4b47c42 | 186 | register struct mbuf *m; |
6567c660 KS |
187 | register struct pklcd *lcp; |
188 | register int i; | |
189 | ||
190 | /* Restart all logical channels. */ | |
1c41f5e9 | 191 | if (pkp -> pk_chan == 0) |
039be508 | 192 | return; |
1c41f5e9 KS |
193 | for (i = 1; i <= pkp -> pk_maxlcn; ++i) |
194 | if ((lcp = pkp -> pk_chan[i]) != NULL) { | |
c4b47c42 | 195 | if (lcp -> lcd_so) { |
1c41f5e9 | 196 | lcp -> lcd_so -> so_error = ENETRESET; |
c4b47c42 KS |
197 | pk_close (lcp); |
198 | } else { | |
199 | pk_flush (lcp); | |
200 | lcp -> lcd_state = READY; | |
201 | if (lcp -> lcd_upper) | |
32f30cd6 | 202 | lcp -> lcd_upper (lcp, 0); |
c4b47c42 | 203 | } |
6567c660 KS |
204 | } |
205 | ||
206 | if (restart_cause < 0) | |
207 | return; | |
208 | ||
1c41f5e9 KS |
209 | pkp -> pk_state = DTE_SENT_RESTART; |
210 | lcp = pkp -> pk_chan[0]; | |
c4b47c42 | 211 | m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESTART); |
822e810c | 212 | m -> m_pkthdr.len = m -> m_len += 2; |
32f30cd6 KS |
213 | mtod (m, struct x25_packet *) -> packet_data = 0; /* DTE only */ |
214 | mtod (m, octet *)[4] = restart_cause; | |
6567c660 KS |
215 | pk_output (lcp); |
216 | } | |
217 | ||
218 | ||
219 | /* | |
220 | * This procedure frees up the Logical Channel Descripter. | |
221 | */ | |
222 | ||
6567c660 KS |
223 | pk_freelcd (lcp) |
224 | register struct pklcd *lcp; | |
225 | { | |
226 | if (lcp == NULL) | |
227 | return; | |
228 | ||
6567c660 KS |
229 | if (lcp -> lcd_lcn > 0) |
230 | lcp -> lcd_pkp -> pk_chan[lcp -> lcd_lcn] = NULL; | |
231 | ||
32f30cd6 KS |
232 | pk_flush (lcp); |
233 | remque (&lcp -> lcd_q); | |
234 | free ((caddr_t)lcp, M_PCB); | |
6567c660 KS |
235 | } |
236 | ||
237 | ||
238 | /* | |
239 | * Bind a address and protocol value to a socket. The important | |
240 | * part is the protocol value - the first four characters of the | |
241 | * Call User Data field. | |
242 | */ | |
243 | ||
244 | pk_bind (lcp, nam) | |
245 | struct pklcd *lcp; | |
246 | struct mbuf *nam; | |
247 | { | |
6567c660 | 248 | register struct pkcb *pkp; |
6567c660 | 249 | register struct pklcd *pp; |
ffababe5 | 250 | register struct sockaddr_x25 *sa; |
6567c660 KS |
251 | |
252 | if (nam == NULL) | |
253 | return (EADDRNOTAVAIL); | |
254 | if (lcp -> lcd_ceaddr) /* XXX */ | |
255 | return (EADDRINUSE); | |
c4b47c42 | 256 | if (pk_checksockaddr (nam)) |
6567c660 KS |
257 | return (EINVAL); |
258 | sa = mtod (nam, struct sockaddr_x25 *); | |
259 | ||
260 | /* | |
261 | * If the user wishes to accept calls only from a particular | |
262 | * net (net != 0), make sure the net is known | |
263 | */ | |
264 | ||
265 | if (sa -> x25_net) | |
266 | for (pkp = pkcbhead; ; pkp = pkp -> pk_next) { | |
267 | if (pkp == 0) | |
268 | return (ENETUNREACH); | |
4507dea2 | 269 | if (pkp -> pk_xcp -> xc_addr.x25_net == sa -> x25_net) |
6567c660 KS |
270 | break; |
271 | } | |
272 | ||
c4b47c42 KS |
273 | /* |
274 | * For ISO's sake permit default listeners, but only one such . . . | |
275 | */ | |
276 | for (pp = pk_listenhead; pp; pp = pp -> lcd_listen) { | |
277 | register struct sockaddr_x25 *sa2 = pp -> lcd_ceaddr; | |
278 | if ((sa2 -> x25_udlen == sa -> x25_udlen) && | |
279 | (sa2 -> x25_udlen == 0 || | |
280 | (bcmp (sa2 -> x25_udata, sa -> x25_udata, | |
281 | min (sa2 -> x25_udlen, sa -> x25_udlen)) == 0))) | |
282 | return (EADDRINUSE); | |
283 | } | |
ffababe5 KS |
284 | lcp -> lcd_laddr = *sa; |
285 | lcp -> lcd_ceaddr = &lcp -> lcd_laddr; | |
6567c660 KS |
286 | return (0); |
287 | } | |
288 | ||
c4b47c42 KS |
289 | /* |
290 | * Include a bound control block in the list of listeners. | |
291 | */ | |
292 | pk_listen (lcp) | |
293 | register struct pklcd *lcp; | |
294 | { | |
295 | register struct pklcd **pp; | |
296 | ||
297 | if (lcp -> lcd_ceaddr == 0) | |
298 | return (EDESTADDRREQ); | |
299 | ||
300 | lcp -> lcd_state = LISTEN; | |
301 | /* | |
302 | * Add default listener at end, any others at start. | |
303 | */ | |
304 | if (lcp -> lcd_ceaddr -> x25_udlen == 0) { | |
305 | for (pp = &pk_listenhead; *pp; ) | |
306 | pp = &((*pp) -> lcd_listen); | |
307 | *pp = lcp; | |
308 | } else { | |
309 | lcp -> lcd_listen = pk_listenhead; | |
310 | pk_listenhead = lcp; | |
311 | } | |
312 | return (0); | |
313 | } | |
314 | /* | |
315 | * Include a listening control block for the benefit of other protocols. | |
316 | */ | |
317 | pk_protolisten (spi, spilen, callee) | |
32f30cd6 | 318 | int (*callee) (); |
c4b47c42 KS |
319 | { |
320 | register struct pklcd *lcp = pk_attach ((struct socket *)0); | |
321 | register struct mbuf *nam; | |
322 | register struct sockaddr_x25 *sa; | |
323 | int error = ENOBUFS; | |
324 | ||
325 | if (lcp) { | |
32f30cd6 KS |
326 | if (nam = m_getclr (MT_SONAME, M_DONTWAIT)) { |
327 | sa = mtod (nam, struct sockaddr_x25 *); | |
c4b47c42 KS |
328 | sa -> x25_family = AF_CCITT; |
329 | sa -> x25_len = nam -> m_len = sizeof (*sa); | |
330 | sa -> x25_udlen = spilen; | |
331 | sa -> x25_udata[0] = spi; | |
332 | lcp -> lcd_upper = callee; | |
333 | lcp -> lcd_flags = X25_MBS_HOLD; | |
26696d71 KS |
334 | if ((error = pk_bind (lcp, nam)) == 0) |
335 | error = pk_listen (lcp); | |
c4b47c42 KS |
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; |
f60b6d8f | 372 | lcp -> lcd_flags |= sa -> x25_opts.op_flags; |
6567c660 KS |
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 | |
26696d71 KS |
391 | * |
392 | * This is clearly bogus for many llc2's sharing | |
393 | * the same xcp; we will replace this with a | |
394 | * routing lookup. | |
6567c660 KS |
395 | */ |
396 | if (sa -> x25_net == 0 && pkp -> pk_next == 0) | |
397 | break; | |
4507dea2 | 398 | if (sa -> x25_net == pkp -> pk_xcp -> xc_addr.x25_net) |
6567c660 KS |
399 | break; |
400 | } | |
401 | ||
402 | if (pkp -> pk_state != DTE_READY) | |
403 | return (ENETDOWN); | |
404 | if ((lcp -> lcd_lcn = pk_getlcn (pkp)) == 0) | |
405 | return (EMFILE); | |
ffababe5 | 406 | lcp -> lcd_faddr = *sa; |
1c41f5e9 | 407 | lcp -> lcd_ceaddr = & lcp -> lcd_faddr; |
6567c660 | 408 | pk_assoc (pkp, lcp, lcp -> lcd_ceaddr); |
4507dea2 | 409 | if (lcp -> lcd_so) |
039be508 | 410 | soisconnecting (lcp -> lcd_so); |
6567c660 | 411 | lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CALL); |
ffababe5 | 412 | pk_callrequest (lcp, lcp -> lcd_ceaddr, pkp -> pk_xcp); |
26696d71 | 413 | return (*pkp -> pk_ia -> ia_start) (lcp); |
6567c660 KS |
414 | } |
415 | ||
fe9ae892 KS |
416 | struct bcdinfo { |
417 | octet *cp; | |
418 | unsigned posn; | |
419 | }; | |
6567c660 KS |
420 | /* |
421 | * Build the rest of the CALL REQUEST packet. Fill in calling | |
422 | * address, facilities fields and the user data field. | |
423 | */ | |
424 | ||
ffababe5 | 425 | pk_callrequest (lcp, sa, xcp) |
6567c660 | 426 | struct pklcd *lcp; |
ffababe5 | 427 | register struct sockaddr_x25 *sa; |
6567c660 KS |
428 | register struct x25config *xcp; |
429 | { | |
430 | register struct x25_calladdr *a; | |
c4b47c42 | 431 | register struct mbuf *m = lcp -> lcd_template; |
32f30cd6 | 432 | register struct x25_packet *xp = mtod (m, struct x25_packet *); |
fe9ae892 | 433 | struct bcdinfo b; |
6567c660 | 434 | |
9a1afe6f | 435 | if (lcp -> lcd_flags & X25_DBIT) |
c4b47c42 KS |
436 | xp -> d_bit = 1; |
437 | a = (struct x25_calladdr *) &xp -> packet_data; | |
fe9ae892 KS |
438 | b.cp = (octet *) a -> address_field; |
439 | b.posn = 0; | |
440 | a -> called_addrlen = to_bcd (&b, sa, xcp); | |
441 | a -> calling_addrlen = to_bcd (&b, &xcp -> xc_addr, xcp); | |
442 | if (b.posn & 0x01) | |
443 | *b.cp++ &= 0xf0; | |
444 | m -> m_pkthdr.len = m -> m_len += b.cp - (octet *) a; | |
6567c660 | 445 | |
c4b47c42 | 446 | if (lcp -> lcd_facilities) { |
32f30cd6 | 447 | m -> m_pkthdr.len += |
fe9ae892 | 448 | (m -> m_next = lcp -> lcd_facilities) -> m_pkthdr.len; |
c4b47c42 | 449 | lcp -> lcd_facilities = 0; |
c4b47c42 | 450 | } else |
fe9ae892 | 451 | pk_build_facilities (m, sa, (int)xcp -> xc_type); |
c4b47c42 | 452 | |
32f30cd6 | 453 | m_copyback (m, m -> m_pkthdr.len, sa -> x25_udlen, sa -> x25_udata); |
6567c660 KS |
454 | } |
455 | ||
fe9ae892 | 456 | pk_build_facilities (m, sa, type) |
c4b47c42 | 457 | register struct mbuf *m; |
6567c660 KS |
458 | struct sockaddr_x25 *sa; |
459 | { | |
c4b47c42 | 460 | register octet *cp; |
6567c660 KS |
461 | register octet *fcp; |
462 | register int revcharge; | |
463 | ||
32f30cd6 | 464 | cp = mtod (m, octet *) + m -> m_len; |
c4b47c42 | 465 | fcp = cp + 1; |
6567c660 KS |
466 | revcharge = sa -> x25_opts.op_flags & X25_REVERSE_CHARGE ? 1 : 0; |
467 | /* | |
468 | * This is specific to Datapac X.25(1976) DTEs. International | |
469 | * calls must have the "hi priority" bit on. | |
470 | */ | |
471 | if (type == X25_1976 && sa -> x25_opts.op_psize == X25_PS128) | |
472 | revcharge |= 02; | |
473 | if (revcharge) { | |
474 | *fcp++ = FACILITIES_REVERSE_CHARGE; | |
475 | *fcp++ = revcharge; | |
476 | } | |
477 | switch (type) { | |
478 | case X25_1980: | |
479 | case X25_1984: | |
480 | *fcp++ = FACILITIES_PACKETSIZE; | |
481 | *fcp++ = sa -> x25_opts.op_psize; | |
482 | *fcp++ = sa -> x25_opts.op_psize; | |
483 | ||
484 | *fcp++ = FACILITIES_WINDOWSIZE; | |
485 | *fcp++ = sa -> x25_opts.op_wsize; | |
486 | *fcp++ = sa -> x25_opts.op_wsize; | |
487 | } | |
c4b47c42 KS |
488 | *cp = fcp - cp - 1; |
489 | m -> m_pkthdr.len = (m -> m_len += *cp + 1); | |
6567c660 KS |
490 | } |
491 | ||
fe9ae892 KS |
492 | to_bcd (b, sa, xcp) |
493 | register struct bcdinfo *b; | |
494 | struct sockaddr_x25 *sa; | |
495 | register struct x25config *xcp; | |
6567c660 | 496 | { |
fe9ae892 KS |
497 | register char *x = sa -> x25_addr; |
498 | unsigned start = b -> posn; | |
499 | /* | |
500 | * The nodnic and prepnd0 stuff looks tedious, | |
501 | * but it does allow full X.121 addresses to be used, | |
502 | * which is handy for routing info (& OSI type 37 addresses). | |
503 | */ | |
504 | if (xcp -> xc_addr.x25_net && (xcp -> xc_nodnic || xcp -> xc_prepnd0)) { | |
505 | char dnicname[sizeof(long) * NBBY/3 + 2]; | |
506 | register char *p = dnicname; | |
507 | ||
508 | sprintf (p, "%d", xcp -> xc_addr.x25_net & 0x7fff); | |
509 | for (; *p; p++) /* *p == 0 means dnic matched */ | |
510 | if ((*p ^ *x++) & 0x0f) | |
511 | break; | |
512 | if (*p || xcp -> xc_nodnic == 0) | |
513 | x = sa -> x25_addr; | |
514 | if (*p && xcp -> xc_prepnd0) { | |
515 | if ((b -> posn)++ & 0x01) | |
516 | *(b -> cp)++; | |
517 | else | |
518 | *(b -> cp) = 0; | |
519 | } | |
520 | } | |
521 | while (*x) | |
522 | if ((b -> posn)++ & 0x01) | |
523 | *(b -> cp)++ |= *x++ & 0x0F; | |
6567c660 | 524 | else |
fe9ae892 KS |
525 | *(b -> cp) = *x++ << 4; |
526 | return ((b -> posn) - start); | |
6567c660 KS |
527 | } |
528 | ||
529 | /* | |
530 | * This routine gets the first available logical channel number. The | |
531 | * search is from the highest number to lowest number (DTE). | |
532 | */ | |
533 | ||
534 | pk_getlcn (pkp) | |
535 | register struct pkcb *pkp; | |
536 | { | |
537 | register int i; | |
538 | ||
1c41f5e9 | 539 | if (pkp -> pk_chan == 0) |
039be508 | 540 | return (0); |
6567c660 KS |
541 | for (i = pkp -> pk_maxlcn; i > 0; --i) |
542 | if (pkp -> pk_chan[i] == NULL) | |
543 | break; | |
544 | return (i); | |
545 | ||
546 | } | |
547 | ||
6567c660 KS |
548 | /* |
549 | * This procedure sends a CLEAR request packet. The lc state is | |
550 | * set to "SENT_CLEAR". | |
551 | */ | |
552 | ||
c4b47c42 KS |
553 | pk_clear (lcp, diagnostic, abortive) |
554 | register struct pklcd *lcp; | |
6567c660 | 555 | { |
c4b47c42 KS |
556 | register struct mbuf *m = pk_template (lcp -> lcd_lcn, X25_CLEAR); |
557 | ||
558 | m -> m_len += 2; | |
50c09880 | 559 | m -> m_pkthdr.len += 2; |
32f30cd6 KS |
560 | mtod (m, struct x25_packet *) -> packet_data = 0; |
561 | mtod (m, octet *)[4] = diagnostic; | |
c4b47c42 KS |
562 | if (lcp -> lcd_facilities) { |
563 | m -> m_next = lcp -> lcd_facilities; | |
564 | m -> m_pkthdr.len += m -> m_next -> m_len; | |
565 | lcp -> lcd_facilities = 0; | |
566 | } | |
567 | if (abortive) | |
568 | lcp -> lcd_template = m; | |
569 | else { | |
570 | struct socket *so = lcp -> lcd_so; | |
571 | struct sockbuf *sb = so ? & so -> so_snd : & lcp -> lcd_sb; | |
32f30cd6 | 572 | sbappendrecord (sb, m); |
c4b47c42 | 573 | } |
6567c660 KS |
574 | pk_output (lcp); |
575 | ||
576 | } | |
577 | ||
32f30cd6 KS |
578 | /* |
579 | * This procedure generates RNR's or RR's to inhibit or enable | |
580 | * inward data flow, if the current state changes (blocked ==> open or | |
581 | * vice versa), or if forced to generate one. One forces RNR's to ack data. | |
582 | */ | |
583 | pk_flowcontrol (lcp, inhibit, forced) | |
584 | register struct pklcd *lcp; | |
585 | { | |
586 | inhibit = (inhibit != 0); | |
587 | if (lcp == 0 || lcp -> lcd_state != DATA_TRANSFER || | |
588 | (forced == 0 && lcp -> lcd_rxrnr_condition == inhibit)) | |
589 | return; | |
590 | lcp -> lcd_rxrnr_condition = inhibit; | |
26696d71 KS |
591 | lcp -> lcd_template = |
592 | pk_template (lcp -> lcd_lcn, inhibit ? X25_RNR : X25_RR); | |
32f30cd6 KS |
593 | pk_output (lcp); |
594 | } | |
595 | ||
6567c660 | 596 | /* |
32f30cd6 | 597 | * This procedure sends a RESET request packet. It re-intializes |
6567c660 KS |
598 | * virtual circuit. |
599 | */ | |
600 | ||
601 | static | |
c4b47c42 | 602 | pk_reset (lcp, diagnostic) |
6567c660 KS |
603 | register struct pklcd *lcp; |
604 | { | |
c4b47c42 KS |
605 | register struct mbuf *m; |
606 | register struct socket *so = lcp -> lcd_so; | |
6567c660 KS |
607 | |
608 | if (lcp -> lcd_state != DATA_TRANSFER) | |
609 | return; | |
610 | ||
c4b47c42 KS |
611 | if (so) |
612 | so -> so_error = ECONNRESET; | |
6567c660 KS |
613 | lcp -> lcd_reset_condition = TRUE; |
614 | ||
615 | /* Reset all the control variables for the channel. */ | |
c4b47c42 | 616 | pk_flush (lcp); |
6567c660 KS |
617 | lcp -> lcd_window_condition = lcp -> lcd_rnr_condition = |
618 | lcp -> lcd_intrconf_pending = FALSE; | |
619 | lcp -> lcd_rsn = MODULUS - 1; | |
620 | lcp -> lcd_ssn = 0; | |
621 | lcp -> lcd_output_window = lcp -> lcd_input_window = | |
622 | lcp -> lcd_last_transmitted_pr = 0; | |
c4b47c42 | 623 | m = lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESET); |
822e810c | 624 | m -> m_pkthdr.len = m -> m_len += 2; |
32f30cd6 KS |
625 | mtod (m, struct x25_packet *) -> packet_data = 0; |
626 | mtod (m, octet *)[4] = diagnostic; | |
c4b47c42 KS |
627 | pk_output (lcp); |
628 | ||
629 | } | |
630 | ||
631 | /* | |
632 | * This procedure frees all data queued for output or delivery on a | |
633 | * virtual circuit. | |
634 | */ | |
635 | ||
636 | pk_flush (lcp) | |
637 | register struct pklcd *lcp; | |
638 | { | |
639 | register struct socket *so; | |
640 | ||
641 | if (lcp -> lcd_template) | |
642 | m_freem (lcp -> lcd_template); | |
643 | ||
644 | if (lcp -> lcd_cps) { | |
32f30cd6 | 645 | m_freem (lcp -> lcd_cps); |
c4b47c42 KS |
646 | lcp -> lcd_cps = 0; |
647 | } | |
32f30cd6 KS |
648 | if (lcp -> lcd_facilities) { |
649 | m_freem (lcp -> lcd_facilities); | |
650 | lcp -> lcd_facilities = 0; | |
651 | } | |
652 | if (so = lcp -> lcd_so) { | |
039be508 | 653 | sbflush (&so -> so_snd); |
c4b47c42 KS |
654 | } else |
655 | sbflush (&lcp -> lcd_sb); | |
6567c660 KS |
656 | } |
657 | ||
6567c660 KS |
658 | /* |
659 | * This procedure handles all local protocol procedure errors. | |
660 | */ | |
661 | ||
c4b47c42 | 662 | pk_procerror (error, lcp, errstr, diagnostic) |
6567c660 KS |
663 | register struct pklcd *lcp; |
664 | char *errstr; | |
665 | { | |
666 | ||
667 | pk_message (lcp -> lcd_lcn, lcp -> lcd_pkp -> pk_xcp, errstr); | |
668 | ||
669 | switch (error) { | |
670 | case CLEAR: | |
1c41f5e9 KS |
671 | if (lcp -> lcd_so) { |
672 | lcp -> lcd_so -> so_error = ECONNABORTED; | |
673 | soisdisconnecting (lcp -> lcd_so); | |
6567c660 | 674 | } |
c4b47c42 | 675 | pk_clear (lcp, diagnostic, 1); |
6567c660 KS |
676 | break; |
677 | ||
678 | case RESET: | |
c4b47c42 | 679 | pk_reset (lcp, diagnostic); |
6567c660 KS |
680 | } |
681 | } | |
682 | ||
683 | /* | |
684 | * This procedure is called during the DATA TRANSFER state to check | |
685 | * and process the P(R) values received in the DATA, RR OR RNR | |
686 | * packets. | |
687 | */ | |
688 | ||
689 | pk_ack (lcp, pr) | |
690 | struct pklcd *lcp; | |
691 | unsigned pr; | |
692 | { | |
693 | register struct socket *so = lcp -> lcd_so; | |
694 | ||
695 | if (lcp -> lcd_output_window == pr) | |
696 | return (PACKET_OK); | |
697 | if (lcp -> lcd_output_window < lcp -> lcd_ssn) { | |
698 | if (pr < lcp -> lcd_output_window || pr > lcp -> lcd_ssn) { | |
c4b47c42 KS |
699 | pk_procerror (RESET, lcp, |
700 | "p(r) flow control error", 2); | |
6567c660 KS |
701 | return (ERROR_PACKET); |
702 | } | |
703 | } | |
704 | else { | |
705 | if (pr < lcp -> lcd_output_window && pr > lcp -> lcd_ssn) { | |
c4b47c42 | 706 | pk_procerror (RESET, lcp, |
32f30cd6 | 707 | "p(r) flow control error #2", 2); |
6567c660 KS |
708 | return (ERROR_PACKET); |
709 | } | |
710 | } | |
711 | ||
712 | lcp -> lcd_output_window = pr; /* Rotate window. */ | |
713 | if (lcp -> lcd_window_condition == TRUE) | |
714 | lcp -> lcd_window_condition = FALSE; | |
715 | ||
039be508 | 716 | if (so && ((so -> so_snd.sb_flags & SB_WAIT) || so -> so_snd.sb_sel)) |
6567c660 KS |
717 | sowwakeup (so); |
718 | ||
719 | return (PACKET_OK); | |
720 | } | |
721 | ||
722 | /* | |
723 | * This procedure decodes the X.25 level 3 packet returning a | |
724 | * code to be used in switchs or arrays. | |
725 | */ | |
726 | ||
727 | pk_decode (xp) | |
728 | register struct x25_packet *xp; | |
729 | { | |
730 | register int type; | |
731 | ||
732 | if (xp -> fmt_identifier != 1) | |
733 | return (INVALID_PACKET); | |
c4b47c42 | 734 | #ifdef ancient_history |
6567c660 KS |
735 | /* |
736 | * Make sure that the logical channel group number is 0. | |
737 | * This restriction may be removed at some later date. | |
738 | */ | |
739 | if (xp -> lc_group_number != 0) | |
740 | return (INVALID_PACKET); | |
c4b47c42 | 741 | #endif |
6567c660 KS |
742 | /* |
743 | * Test for data packet first. | |
744 | */ | |
745 | if (!(xp -> packet_type & DATA_PACKET_DESIGNATOR)) | |
746 | return (DATA); | |
747 | ||
748 | /* | |
749 | * Test if flow control packet (RR or RNR). | |
750 | */ | |
751 | if (!(xp -> packet_type & RR_OR_RNR_PACKET_DESIGNATOR)) | |
32f30cd6 KS |
752 | switch (xp -> packet_type & 0x1f) { |
753 | case X25_RR: | |
6567c660 | 754 | return (RR); |
32f30cd6 | 755 | case X25_RNR: |
6567c660 | 756 | return (RNR); |
32f30cd6 KS |
757 | case X25_REJECT: |
758 | return (REJECT); | |
759 | } | |
6567c660 KS |
760 | |
761 | /* | |
762 | * Determine the rest of the packet types. | |
763 | */ | |
764 | switch (xp -> packet_type) { | |
765 | case X25_CALL: | |
766 | type = CALL; | |
767 | break; | |
768 | ||
769 | case X25_CALL_ACCEPTED: | |
770 | type = CALL_ACCEPTED; | |
771 | break; | |
772 | ||
773 | case X25_CLEAR: | |
774 | type = CLEAR; | |
775 | break; | |
776 | ||
777 | case X25_CLEAR_CONFIRM: | |
778 | type = CLEAR_CONF; | |
779 | break; | |
780 | ||
781 | case X25_INTERRUPT: | |
782 | type = INTERRUPT; | |
783 | break; | |
784 | ||
785 | case X25_INTERRUPT_CONFIRM: | |
786 | type = INTERRUPT_CONF; | |
787 | break; | |
788 | ||
789 | case X25_RESET: | |
790 | type = RESET; | |
791 | break; | |
792 | ||
793 | case X25_RESET_CONFIRM: | |
794 | type = RESET_CONF; | |
795 | break; | |
796 | ||
797 | case X25_RESTART: | |
798 | type = RESTART; | |
799 | break; | |
800 | ||
801 | case X25_RESTART_CONFIRM: | |
802 | type = RESTART_CONF; | |
803 | break; | |
804 | ||
32f30cd6 | 805 | case X25_DIAGNOSTIC: |
5336ccc3 | 806 | type = DIAG_TYPE; |
32f30cd6 KS |
807 | break; |
808 | ||
6567c660 KS |
809 | default: |
810 | type = INVALID_PACKET; | |
811 | } | |
812 | return (type); | |
813 | } | |
814 | ||
815 | /* | |
816 | * A restart packet has been received. Print out the reason | |
817 | * for the restart. | |
818 | */ | |
819 | ||
820 | pk_restartcause (pkp, xp) | |
821 | struct pkcb *pkp; | |
822 | register struct x25_packet *xp; | |
823 | { | |
824 | register struct x25config *xcp = pkp -> pk_xcp; | |
9a1afe6f | 825 | register int lcn = LCN(xp); |
6567c660 KS |
826 | |
827 | switch (xp -> packet_data) { | |
828 | case X25_RESTART_LOCAL_PROCEDURE_ERROR: | |
829 | pk_message (lcn, xcp, "restart: local procedure error"); | |
830 | break; | |
831 | ||
832 | case X25_RESTART_NETWORK_CONGESTION: | |
833 | pk_message (lcn, xcp, "restart: network congestion"); | |
834 | break; | |
835 | ||
836 | case X25_RESTART_NETWORK_OPERATIONAL: | |
837 | pk_message (lcn, xcp, "restart: network operational"); | |
838 | break; | |
839 | ||
840 | default: | |
841 | pk_message (lcn, xcp, "restart: unknown cause"); | |
842 | } | |
843 | } | |
844 | ||
845 | #define MAXRESETCAUSE 7 | |
846 | ||
847 | int Reset_cause[] = { | |
848 | EXRESET, EXROUT, 0, EXRRPE, 0, EXRLPE, 0, EXRNCG | |
849 | }; | |
850 | ||
851 | /* | |
852 | * A reset packet has arrived. Return the cause to the user. | |
853 | */ | |
854 | ||
855 | pk_resetcause (pkp, xp) | |
856 | struct pkcb *pkp; | |
857 | register struct x25_packet *xp; | |
858 | { | |
1c41f5e9 | 859 | register struct pklcd *lcp = |
9a1afe6f | 860 | pkp -> pk_chan[LCN(xp)]; |
6567c660 KS |
861 | register int code = xp -> packet_data; |
862 | ||
863 | if (code > MAXRESETCAUSE) | |
864 | code = 7; /* EXRNCG */ | |
865 | ||
32f30cd6 KS |
866 | pk_message(LCN(xp), lcp -> lcd_pkp, "reset code 0x%x, diagnostic 0x%x", |
867 | xp -> packet_data, 4[(u_char *)xp]); | |
868 | ||
26696d71 KS |
869 | if (lcp -> lcd_so) |
870 | lcp -> lcd_so -> so_error = Reset_cause[code]; | |
6567c660 KS |
871 | } |
872 | ||
873 | #define MAXCLEARCAUSE 25 | |
874 | ||
875 | int Clear_cause[] = { | |
876 | EXCLEAR, EXCBUSY, 0, EXCINV, 0, EXCNCG, 0, | |
877 | 0, 0, EXCOUT, 0, EXCAB, 0, EXCNOB, 0, 0, 0, EXCRPE, | |
878 | 0, EXCLPE, 0, 0, 0, 0, 0, EXCRRC | |
879 | }; | |
880 | ||
881 | /* | |
882 | * A clear packet has arrived. Return the cause to the user. | |
883 | */ | |
884 | ||
885 | pk_clearcause (pkp, xp) | |
886 | struct pkcb *pkp; | |
887 | register struct x25_packet *xp; | |
888 | { | |
1c41f5e9 | 889 | register struct pklcd *lcp = |
9a1afe6f | 890 | pkp -> pk_chan[LCN(xp)]; |
6567c660 KS |
891 | register int code = xp -> packet_data; |
892 | ||
893 | if (code > MAXCLEARCAUSE) | |
894 | code = 5; /* EXRNCG */ | |
822e810c KS |
895 | if (lcp -> lcd_so) |
896 | lcp -> lcd_so -> so_error = Clear_cause[code]; | |
6567c660 KS |
897 | } |
898 | ||
899 | char * | |
900 | format_ntn (xcp) | |
901 | register struct x25config *xcp; | |
902 | { | |
4507dea2 KS |
903 | |
904 | return (xcp -> xc_addr.x25_addr); | |
6567c660 KS |
905 | } |
906 | ||
907 | /* VARARGS1 */ | |
908 | pk_message (lcn, xcp, fmt, a1, a2, a3, a4, a5, a6) | |
909 | struct x25config *xcp; | |
910 | char *fmt; | |
911 | { | |
912 | ||
913 | if (lcn) | |
914 | if (pkcbhead -> pk_next) | |
915 | printf ("X.25(%s): lcn %d: ", format_ntn (xcp), lcn); | |
916 | else | |
917 | printf ("X.25: lcn %d: ", lcn); | |
918 | else | |
919 | if (pkcbhead -> pk_next) | |
920 | printf ("X.25(%s): ", format_ntn (xcp)); | |
921 | else | |
922 | printf ("X.25: "); | |
923 | ||
924 | printf (fmt, a1, a2, a3, a4, a5, a6); | |
925 | printf ("\n"); | |
926 | } | |
1c41f5e9 | 927 | |
32f30cd6 | 928 | pk_fragment (lcp, m0, qbit, mbit, wait) |
1c41f5e9 KS |
929 | struct mbuf *m0; |
930 | register struct pklcd *lcp; | |
931 | { | |
932 | register struct mbuf *m = m0; | |
933 | register struct x25_packet *xp; | |
934 | register struct sockbuf *sb; | |
32f30cd6 | 935 | struct mbuf *head = 0, *next, **mp = &head, *m_split (); |
1c41f5e9 KS |
936 | int totlen, psize = 1 << (lcp -> lcd_packetsize); |
937 | ||
938 | if (m == 0) | |
822e810c | 939 | return 0; |
c4b47c42 | 940 | if (m -> m_flags & M_PKTHDR == 0) |
32f30cd6 | 941 | panic ("pk_fragment"); |
1c41f5e9 | 942 | totlen = m -> m_pkthdr.len; |
9a1afe6f | 943 | m -> m_act = 0; |
1c41f5e9 KS |
944 | sb = lcp -> lcd_so ? &lcp -> lcd_so -> so_snd : & lcp -> lcd_sb; |
945 | do { | |
946 | if (totlen > psize) { | |
32f30cd6 | 947 | if ((next = m_split (m, psize, wait)) == 0) |
1c41f5e9 | 948 | goto abort; |
1c41f5e9 | 949 | totlen -= psize; |
9a1afe6f KS |
950 | } else |
951 | next = 0; | |
1c41f5e9 KS |
952 | M_PREPEND(m, PKHEADERLN, wait); |
953 | if (m == 0) | |
954 | goto abort; | |
9a1afe6f KS |
955 | *mp = m; |
956 | mp = & m -> m_act; | |
957 | *mp = 0; | |
32f30cd6 | 958 | xp = mtod (m, struct x25_packet *); |
1c41f5e9 KS |
959 | 0[(char *)xp] = 0; |
960 | if (qbit) | |
9a1afe6f KS |
961 | xp -> q_bit = 1; |
962 | if (lcp -> lcd_flags & X25_DBIT) | |
963 | xp -> d_bit = 1; | |
1c41f5e9 | 964 | xp -> fmt_identifier = 1; |
1c41f5e9 | 965 | xp -> packet_type = X25_DATA; |
9a1afe6f KS |
966 | SET_LCN(xp, lcp -> lcd_lcn); |
967 | if (next || (mbit && (totlen == psize || | |
968 | (lcp -> lcd_flags & X25_DBIT)))) | |
1c41f5e9 | 969 | MBIT(xp) = 1; |
1c41f5e9 | 970 | } while (m = next); |
9a1afe6f | 971 | for (m = head; m; m = next) { |
1c41f5e9 KS |
972 | next = m -> m_act; |
973 | m -> m_act = 0; | |
32f30cd6 | 974 | sbappendrecord (sb, m); |
1c41f5e9 KS |
975 | } |
976 | return 0; | |
977 | abort: | |
9a1afe6f | 978 | if (wait) |
32f30cd6 | 979 | panic ("pk_fragment null mbuf after wait"); |
9a1afe6f | 980 | if (next) |
32f30cd6 | 981 | m_freem (next); |
9a1afe6f | 982 | for (m = head; m; m = next) { |
1c41f5e9 | 983 | next = m -> m_act; |
32f30cd6 | 984 | m_freem (m); |
1c41f5e9 KS |
985 | } |
986 | return ENOBUFS; | |
987 | } |