1 | /* $NetBSD: ppp_tty.c,v 1.63 2016/10/02 14:17:07 christos Exp $ */ |
2 | /* Id: ppp_tty.c,v 1.3 1996/07/01 01:04:11 paulus Exp */ |
3 | |
4 | /* |
5 | * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous |
6 | * tty devices. |
7 | * |
8 | * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * |
17 | * 2. Redistributions in binary form must reproduce the above copyright |
18 | * notice, this list of conditions and the following disclaimer in |
19 | * the documentation and/or other materials provided with the |
20 | * distribution. |
21 | * |
22 | * 3. The name "Carnegie Mellon University" must not be used to |
23 | * endorse or promote products derived from this software without |
24 | * prior written permission. For permission or any legal |
25 | * details, please contact |
26 | * Office of Technology Transfer |
27 | * Carnegie Mellon University |
28 | * 5000 Forbes Avenue |
29 | * Pittsburgh, PA 15213-3890 |
30 | * (412) 268-4387, fax: (412) 268-7395 |
31 | * tech-transfer@andrew.cmu.edu |
32 | * |
33 | * 4. Redistributions of any form whatsoever must retain the following |
34 | * acknowledgment: |
35 | * "This product includes software developed by Computing Services |
36 | * at Carnegie Mellon University (http://www.cmu.edu/computing/)." |
37 | * |
38 | * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO |
39 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
40 | * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE |
41 | * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
42 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
43 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
44 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
45 | * |
46 | * Based on: |
47 | * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 |
48 | * |
49 | * Copyright (c) 1987 Regents of the University of California. |
50 | * All rights reserved. |
51 | * |
52 | * Redistribution and use in source and binary forms are permitted |
53 | * provided that the above copyright notice and this paragraph are |
54 | * duplicated in all such forms and that any documentation, |
55 | * advertising materials, and other materials related to such |
56 | * distribution and use acknowledge that the software was developed |
57 | * by the University of California, Berkeley. The name of the |
58 | * University may not be used to endorse or promote products derived |
59 | * from this software without specific prior written permission. |
60 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
61 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
62 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
63 | * |
64 | * Serial Line interface |
65 | * |
66 | * Rick Adams |
67 | * Center for Seismic Studies |
68 | * 1300 N 17th Street, Suite 1450 |
69 | * Arlington, Virginia 22209 |
70 | * (703)276-7900 |
71 | * rick@seismo.ARPA |
72 | * seismo!rick |
73 | * |
74 | * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). |
75 | * Converted to 4.3BSD Beta by Chris Torek. |
76 | * Other changes made at Berkeley, based in part on code by Kirk Smith. |
77 | * |
78 | * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) |
79 | * Added VJ tcp header compression; more unified ioctls |
80 | * |
81 | * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). |
82 | * Cleaned up a lot of the mbuf-related code to fix bugs that |
83 | * caused system crashes and packet corruption. Changed pppstart |
84 | * so that it doesn't just give up with a "collision" if the whole |
85 | * packet doesn't fit in the output ring buffer. |
86 | * |
87 | * Added priority queueing for interactive IP packets, following |
88 | * the model of if_sl.c, plus hooks for bpf. |
89 | * Paul Mackerras (paulus@cs.anu.edu.au). |
90 | */ |
91 | |
92 | /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ |
93 | /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ |
94 | |
95 | #include <sys/cdefs.h> |
96 | __KERNEL_RCSID(0, "$NetBSD: ppp_tty.c,v 1.63 2016/10/02 14:17:07 christos Exp $" ); |
97 | |
98 | #ifdef _KERNEL_OPT |
99 | #include "ppp.h" |
100 | #include "opt_ppp.h" |
101 | #endif |
102 | #define VJC |
103 | #define PPP_COMPRESS |
104 | |
105 | #include <sys/param.h> |
106 | #include <sys/proc.h> |
107 | #include <sys/mbuf.h> |
108 | #include <sys/dkstat.h> |
109 | #include <sys/socket.h> |
110 | #include <sys/ioctl.h> |
111 | #include <sys/file.h> |
112 | #include <sys/tty.h> |
113 | #include <sys/kernel.h> |
114 | #include <sys/conf.h> |
115 | #include <sys/vnode.h> |
116 | #include <sys/systm.h> |
117 | #include <sys/kauth.h> |
118 | |
119 | #include <net/if.h> |
120 | #include <net/if_types.h> |
121 | |
122 | #ifdef VJC |
123 | #include <netinet/in.h> |
124 | #include <netinet/in_systm.h> |
125 | #include <netinet/ip.h> |
126 | #include <net/slcompress.h> |
127 | #endif |
128 | |
129 | #include <net/bpf.h> |
130 | #include <net/ppp_defs.h> |
131 | #include <net/if_ppp.h> |
132 | #include <net/if_pppvar.h> |
133 | |
134 | static int pppopen(dev_t dev, struct tty *tp); |
135 | static int pppclose(struct tty *tp, int flag); |
136 | static int pppread(struct tty *tp, struct uio *uio, int flag); |
137 | static int pppwrite(struct tty *tp, struct uio *uio, int flag); |
138 | static int ppptioctl(struct tty *tp, u_long cmd, void *data, int flag, |
139 | struct lwp *); |
140 | static int pppinput(int c, struct tty *tp); |
141 | static int pppstart(struct tty *tp); |
142 | |
143 | struct linesw ppp_disc = { /* XXX should be static */ |
144 | .l_name = "ppp" , |
145 | .l_open = pppopen, |
146 | .l_close = pppclose, |
147 | .l_read = pppread, |
148 | .l_write = pppwrite, |
149 | .l_ioctl = ppptioctl, |
150 | .l_rint = pppinput, |
151 | .l_start = pppstart, |
152 | .l_modem = ttymodem, |
153 | .l_poll = ttpoll |
154 | }; |
155 | |
156 | static void ppprcvframe(struct ppp_softc *sc, struct mbuf *m); |
157 | static uint16_t pppfcs(uint16_t fcs, const uint8_t *cp, int len); |
158 | static void pppsyncstart(struct ppp_softc *sc); |
159 | static void pppasyncstart(struct ppp_softc *); |
160 | static void pppasyncctlp(struct ppp_softc *); |
161 | static void pppasyncrelinq(struct ppp_softc *); |
162 | static void ppp_timeout(void *); |
163 | static void pppgetm(struct ppp_softc *sc); |
164 | static void pppdumpb(u_char *b, int l); |
165 | static void ppplogchar(struct ppp_softc *, int); |
166 | static void pppdumpframe(struct ppp_softc *sc, struct mbuf* m, int xmit); |
167 | |
168 | /* |
169 | * Some useful mbuf macros not in mbuf.h. |
170 | */ |
171 | #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) |
172 | |
173 | #define M_DATASTART(m) \ |
174 | (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ |
175 | (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) |
176 | |
177 | #define M_DATASIZE(m) \ |
178 | (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ |
179 | (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) |
180 | |
181 | /* |
182 | * Does c need to be escaped? |
183 | */ |
184 | #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F))) |
185 | |
186 | /* |
187 | * Procedures for using an async tty interface for PPP. |
188 | */ |
189 | |
190 | /* This is a NetBSD-1.0 or later kernel. */ |
191 | #define CCOUNT(q) ((q)->c_cc) |
192 | |
193 | #define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */ |
194 | #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */ |
195 | |
196 | /* |
197 | * Line specific open routine for async tty devices. |
198 | * Attach the given tty to the first available ppp unit. |
199 | * Called from device open routine or ttioctl. |
200 | */ |
201 | /* ARGSUSED */ |
202 | static int |
203 | pppopen(dev_t dev, struct tty *tp) |
204 | { |
205 | struct lwp *l = curlwp; /* XXX */ |
206 | struct ppp_softc *sc; |
207 | int error, s; |
208 | |
209 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE_PPP, |
210 | KAUTH_REQ_NETWORK_INTERFACE_PPP_ADD, NULL, NULL, NULL); |
211 | if (error) |
212 | return (error); |
213 | |
214 | s = spltty(); |
215 | |
216 | if (tp->t_linesw == &ppp_disc) { |
217 | sc = (struct ppp_softc *) tp->t_sc; |
218 | if (sc != NULL && sc->sc_devp == (void *) tp) { |
219 | splx(s); |
220 | return (0); |
221 | } |
222 | } |
223 | |
224 | if ((sc = pppalloc(l->l_proc->p_pid)) == NULL) { |
225 | splx(s); |
226 | return ENXIO; |
227 | } |
228 | |
229 | if (sc->sc_relinq) |
230 | (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */ |
231 | |
232 | /* Switch DLT to PPP-over-serial. */ |
233 | bpf_change_type(&sc->sc_if, DLT_PPP_SERIAL, PPP_HDRLEN); |
234 | |
235 | sc->sc_ilen = 0; |
236 | sc->sc_m = NULL; |
237 | memset(sc->sc_asyncmap, 0, sizeof(sc->sc_asyncmap)); |
238 | sc->sc_asyncmap[0] = 0xffffffff; |
239 | sc->sc_asyncmap[3] = 0x60000000; |
240 | sc->sc_rasyncmap = 0; |
241 | sc->sc_devp = (void *) tp; |
242 | sc->sc_start = pppasyncstart; |
243 | sc->sc_ctlp = pppasyncctlp; |
244 | sc->sc_relinq = pppasyncrelinq; |
245 | sc->sc_outm = NULL; |
246 | pppgetm(sc); |
247 | sc->sc_if.if_flags |= IFF_RUNNING; |
248 | sc->sc_if.if_baudrate = tp->t_ospeed; |
249 | |
250 | tp->t_sc = (void *) sc; |
251 | mutex_spin_enter(&tty_lock); |
252 | ttyflush(tp, FREAD | FWRITE); |
253 | mutex_spin_exit(&tty_lock); |
254 | |
255 | splx(s); |
256 | return (0); |
257 | } |
258 | |
259 | /* |
260 | * Line specific close routine, called from device close routine |
261 | * and from ttioctl. |
262 | * Detach the tty from the ppp unit. |
263 | * Mimics part of ttyclose(). |
264 | */ |
265 | static int |
266 | pppclose(struct tty *tp, int flag) |
267 | { |
268 | struct ppp_softc *sc; |
269 | int s; |
270 | |
271 | s = spltty(); |
272 | mutex_spin_enter(&tty_lock); |
273 | ttyflush(tp, FREAD|FWRITE); |
274 | mutex_spin_exit(&tty_lock); /* XXX */ |
275 | ttyldisc_release(tp->t_linesw); |
276 | tp->t_linesw = ttyldisc_default(); |
277 | sc = (struct ppp_softc *) tp->t_sc; |
278 | if (sc != NULL) { |
279 | tp->t_sc = NULL; |
280 | if (tp == (struct tty *) sc->sc_devp) { |
281 | pppasyncrelinq(sc); |
282 | pppdealloc(sc); |
283 | } |
284 | } |
285 | splx(s); |
286 | return 0; |
287 | } |
288 | |
289 | /* |
290 | * Relinquish the interface unit to another device. |
291 | */ |
292 | static void |
293 | pppasyncrelinq(struct ppp_softc *sc) |
294 | { |
295 | int s; |
296 | |
297 | /* Change DLT to back none. */ |
298 | bpf_change_type(&sc->sc_if, DLT_NULL, 0); |
299 | |
300 | s = spltty(); |
301 | if (sc->sc_outm) { |
302 | m_freem(sc->sc_outm); |
303 | sc->sc_outm = NULL; |
304 | } |
305 | if (sc->sc_m) { |
306 | m_freem(sc->sc_m); |
307 | sc->sc_m = NULL; |
308 | } |
309 | if (sc->sc_flags & SC_TIMEOUT) { |
310 | callout_stop(&sc->sc_timo_ch); |
311 | sc->sc_flags &= ~SC_TIMEOUT; |
312 | } |
313 | splx(s); |
314 | } |
315 | |
316 | /* |
317 | * Line specific (tty) read routine. |
318 | */ |
319 | static int |
320 | pppread(struct tty *tp, struct uio *uio, int flag) |
321 | { |
322 | struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; |
323 | struct mbuf *m, *m0; |
324 | int error = 0; |
325 | |
326 | if (sc == NULL) |
327 | return 0; |
328 | /* |
329 | * Loop waiting for input, checking that nothing disasterous |
330 | * happens in the meantime. |
331 | */ |
332 | mutex_spin_enter(&tty_lock); |
333 | for (;;) { |
334 | if (tp != (struct tty *) sc->sc_devp || |
335 | tp->t_linesw != &ppp_disc) { |
336 | mutex_spin_exit(&tty_lock); |
337 | return 0; |
338 | } |
339 | if (sc->sc_inq.ifq_head != NULL) |
340 | break; |
341 | if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0 |
342 | && (tp->t_state & TS_ISOPEN)) { |
343 | mutex_spin_exit(&tty_lock); |
344 | return 0; /* end of file */ |
345 | } |
346 | if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) { |
347 | mutex_spin_exit(&tty_lock); |
348 | return (EWOULDBLOCK); |
349 | } |
350 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
351 | if (error) { |
352 | mutex_spin_exit(&tty_lock); |
353 | return error; |
354 | } |
355 | } |
356 | |
357 | /* Pull place-holder byte out of canonical queue */ |
358 | getc(&tp->t_canq); |
359 | |
360 | /* Get the packet from the input queue */ |
361 | IF_DEQUEUE(&sc->sc_inq, m0); |
362 | mutex_spin_exit(&tty_lock); |
363 | |
364 | for (m = m0; m && uio->uio_resid; m = m->m_next) |
365 | if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0) |
366 | break; |
367 | m_freem(m0); |
368 | return (error); |
369 | } |
370 | |
371 | /* |
372 | * Line specific (tty) write routine. |
373 | */ |
374 | static int |
375 | pppwrite(struct tty *tp, struct uio *uio, int flag) |
376 | { |
377 | struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc; |
378 | struct mbuf *m, *m0; |
379 | struct sockaddr dst; |
380 | int len, error; |
381 | |
382 | if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0) |
383 | return 0; /* wrote 0 bytes */ |
384 | if (tp->t_linesw != &ppp_disc) |
385 | return (EINVAL); |
386 | if (sc == NULL || tp != (struct tty *) sc->sc_devp) |
387 | return EIO; |
388 | if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN || |
389 | uio->uio_resid < PPP_HDRLEN) |
390 | return (EMSGSIZE); |
391 | |
392 | MGETHDR(m0, M_WAIT, MT_DATA); |
393 | if (m0 == NULL) |
394 | return ENOBUFS; |
395 | |
396 | m0->m_len = 0; |
397 | m0->m_pkthdr.len = uio->uio_resid; |
398 | m_reset_rcvif(m0); |
399 | |
400 | if (uio->uio_resid >= MCLBYTES / 2) |
401 | MCLGET(m0, M_DONTWAIT); |
402 | |
403 | for (m = m0; uio->uio_resid;) { |
404 | len = M_TRAILINGSPACE(m); |
405 | if (len > uio->uio_resid) |
406 | len = uio->uio_resid; |
407 | if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) { |
408 | m_freem(m0); |
409 | return (error); |
410 | } |
411 | m->m_len = len; |
412 | |
413 | if (uio->uio_resid == 0) |
414 | break; |
415 | |
416 | MGET(m->m_next, M_WAIT, MT_DATA); |
417 | if (m->m_next == NULL) { |
418 | m_freem(m0); |
419 | return ENOBUFS; |
420 | } |
421 | m = m->m_next; |
422 | m->m_len = 0; |
423 | } |
424 | dst.sa_family = AF_UNSPEC; |
425 | bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN); |
426 | m_adj(m0, PPP_HDRLEN); |
427 | return if_output_lock(&sc->sc_if, &sc->sc_if, m0, &dst, (struct rtentry *)0); |
428 | } |
429 | |
430 | /* |
431 | * Line specific (tty) ioctl routine. |
432 | * This discipline requires that tty device drivers call |
433 | * the line specific l_ioctl routine from their ioctl routines. |
434 | */ |
435 | /* ARGSUSED */ |
436 | static int |
437 | ppptioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) |
438 | { |
439 | struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc; |
440 | int error, s; |
441 | |
442 | if (sc == NULL || tp != (struct tty *) sc->sc_devp) |
443 | return (EPASSTHROUGH); |
444 | |
445 | error = 0; |
446 | switch (cmd) { |
447 | case TIOCRCVFRAME: |
448 | ppprcvframe(sc,*((struct mbuf **)data)); |
449 | break; |
450 | |
451 | case PPPIOCSASYNCMAP: |
452 | if ((error = kauth_authorize_device_tty(l->l_cred, |
453 | KAUTH_DEVICE_TTY_PRIVSET, tp)) != 0) |
454 | break; |
455 | sc->sc_asyncmap[0] = *(u_int *)data; |
456 | break; |
457 | |
458 | case PPPIOCGASYNCMAP: |
459 | *(u_int *)data = sc->sc_asyncmap[0]; |
460 | break; |
461 | |
462 | case PPPIOCSRASYNCMAP: |
463 | if ((error = kauth_authorize_device_tty(l->l_cred, |
464 | KAUTH_DEVICE_TTY_PRIVSET, tp)) != 0) |
465 | break; |
466 | sc->sc_rasyncmap = *(u_int *)data; |
467 | break; |
468 | |
469 | case PPPIOCGRASYNCMAP: |
470 | *(u_int *)data = sc->sc_rasyncmap; |
471 | break; |
472 | |
473 | case PPPIOCSXASYNCMAP: |
474 | if ((error = kauth_authorize_device_tty(l->l_cred, |
475 | KAUTH_DEVICE_TTY_PRIVSET, tp)) != 0) |
476 | break; |
477 | s = spltty(); |
478 | bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); |
479 | sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */ |
480 | sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */ |
481 | sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */ |
482 | splx(s); |
483 | break; |
484 | |
485 | case PPPIOCGXASYNCMAP: |
486 | bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap)); |
487 | break; |
488 | |
489 | default: |
490 | error = pppioctl(sc, cmd, data, flag, l); |
491 | if (error == 0 && cmd == PPPIOCSMRU) |
492 | pppgetm(sc); |
493 | } |
494 | |
495 | return error; |
496 | } |
497 | |
498 | /* receive a complete ppp frame from device in synchronous |
499 | * hdlc mode. caller gives up ownership of mbuf |
500 | */ |
501 | static void |
502 | ppprcvframe(struct ppp_softc *sc, struct mbuf *m) |
503 | { |
504 | int len, s; |
505 | struct mbuf *n; |
506 | u_char hdr[4]; |
507 | int hlen,count; |
508 | |
509 | for (n=m,len=0;n != NULL;n = n->m_next) |
510 | len += n->m_len; |
511 | if (len==0) { |
512 | m_freem(m); |
513 | return; |
514 | } |
515 | |
516 | /* extract PPP header from mbuf chain (1 to 4 bytes) */ |
517 | for (n=m,hlen=0;n!=NULL && hlen<sizeof(hdr);n=n->m_next) { |
518 | count = (sizeof(hdr)-hlen) < n->m_len ? |
519 | sizeof(hdr)-hlen : n->m_len; |
520 | bcopy(mtod(n,u_char*),&hdr[hlen],count); |
521 | hlen+=count; |
522 | } |
523 | |
524 | s = spltty(); |
525 | |
526 | /* if AFCF compressed then prepend AFCF */ |
527 | if (hdr[0] != PPP_ALLSTATIONS) { |
528 | if (sc->sc_flags & SC_REJ_COMP_AC) { |
529 | if (sc->sc_flags & SC_DEBUG) |
530 | printf( |
531 | "%s: garbage received: 0x%x (need 0xFF)\n" , |
532 | sc->sc_if.if_xname, hdr[0]); |
533 | goto bail; |
534 | } |
535 | M_PREPEND(m,2,M_DONTWAIT); |
536 | if (m==NULL) { |
537 | splx(s); |
538 | return; |
539 | } |
540 | hdr[3] = hdr[1]; |
541 | hdr[2] = hdr[0]; |
542 | hdr[0] = PPP_ALLSTATIONS; |
543 | hdr[1] = PPP_UI; |
544 | len += 2; |
545 | } |
546 | |
547 | /* if protocol field compressed, add MSB of protocol field = 0 */ |
548 | if (hdr[2] & 1) { |
549 | /* a compressed protocol */ |
550 | M_PREPEND(m,1,M_DONTWAIT); |
551 | if (m==NULL) { |
552 | splx(s); |
553 | return; |
554 | } |
555 | hdr[3] = hdr[2]; |
556 | hdr[2] = 0; |
557 | len++; |
558 | } |
559 | |
560 | /* valid LSB of protocol field has bit0 set */ |
561 | if (!(hdr[3] & 1)) { |
562 | if (sc->sc_flags & SC_DEBUG) |
563 | printf("%s: bad protocol %x\n" , sc->sc_if.if_xname, |
564 | (hdr[2] << 8) + hdr[3]); |
565 | goto bail; |
566 | } |
567 | |
568 | /* packet beyond configured mru? */ |
569 | if (len > sc->sc_mru + PPP_HDRLEN) { |
570 | if (sc->sc_flags & SC_DEBUG) |
571 | printf("%s: packet too big\n" , sc->sc_if.if_xname); |
572 | goto bail; |
573 | } |
574 | |
575 | /* add expanded 4 byte header to mbuf chain */ |
576 | for (n=m,hlen=0;n!=NULL && hlen<sizeof(hdr);n=n->m_next) { |
577 | count = (sizeof(hdr)-hlen) < n->m_len ? |
578 | sizeof(hdr)-hlen : n->m_len; |
579 | bcopy(&hdr[hlen],mtod(n,u_char*),count); |
580 | hlen+=count; |
581 | } |
582 | |
583 | /* if_ppp.c requires the PPP header and IP header */ |
584 | /* to be contiguous */ |
585 | count = len < MHLEN ? len : MHLEN; |
586 | if (m->m_len < count) { |
587 | m = m_pullup(m,count); |
588 | if (m==NULL) |
589 | goto bail; |
590 | } |
591 | |
592 | sc->sc_stats.ppp_ibytes += len; |
593 | |
594 | if (sc->sc_flags & SC_LOG_RAWIN) |
595 | pppdumpframe(sc,m,0); |
596 | |
597 | ppppktin(sc, m, 0); |
598 | splx(s); |
599 | return; |
600 | bail: |
601 | m_freem(m); |
602 | splx(s); |
603 | } |
604 | |
605 | /* |
606 | * FCS lookup table as calculated by genfcstab. |
607 | */ |
608 | static const uint16_t fcstab[256] = { |
609 | 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, |
610 | 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, |
611 | 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, |
612 | 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, |
613 | 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, |
614 | 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, |
615 | 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, |
616 | 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, |
617 | 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, |
618 | 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, |
619 | 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, |
620 | 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, |
621 | 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, |
622 | 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, |
623 | 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, |
624 | 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, |
625 | 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, |
626 | 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, |
627 | 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, |
628 | 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, |
629 | 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, |
630 | 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, |
631 | 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, |
632 | 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, |
633 | 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, |
634 | 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, |
635 | 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, |
636 | 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, |
637 | 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, |
638 | 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, |
639 | 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, |
640 | 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 |
641 | }; |
642 | |
643 | /* |
644 | * Calculate a new FCS given the current FCS and the new data. |
645 | */ |
646 | static uint16_t |
647 | pppfcs(uint16_t fcs, const uint8_t *cp, int len) |
648 | { |
649 | while (len--) |
650 | fcs = PPP_FCS(fcs, *cp++); |
651 | return (fcs); |
652 | } |
653 | |
654 | /* This gets called at splsoftnet from pppasyncstart at various times |
655 | * when there is data ready to be sent. |
656 | */ |
657 | static void |
658 | pppsyncstart(struct ppp_softc *sc) |
659 | { |
660 | struct tty *tp = (struct tty *) sc->sc_devp; |
661 | struct mbuf *m, *n; |
662 | const struct cdevsw *cdev; |
663 | int len; |
664 | |
665 | for(m = sc->sc_outm;;) { |
666 | if (m == NULL) { |
667 | m = ppp_dequeue(sc); /* get new packet */ |
668 | if (m == NULL) |
669 | break; /* no more packets */ |
670 | if (sc->sc_flags & SC_DEBUG) |
671 | pppdumpframe(sc,m,1); |
672 | } |
673 | for(n=m,len=0;n!=NULL;n=n->m_next) |
674 | len += n->m_len; |
675 | |
676 | /* call device driver IOCTL to transmit a frame */ |
677 | cdev = cdevsw_lookup(tp->t_dev); |
678 | if (cdev == NULL || |
679 | (*cdev->d_ioctl)(tp->t_dev, TIOCXMTFRAME, (void *)&m, |
680 | 0, 0)) { |
681 | /* busy or error, set as current packet */ |
682 | sc->sc_outm = m; |
683 | break; |
684 | } |
685 | sc->sc_outm = m = NULL; |
686 | sc->sc_stats.ppp_obytes += len; |
687 | } |
688 | } |
689 | |
690 | /* |
691 | * This gets called at splsoftnet from if_ppp.c at various times |
692 | * when there is data ready to be sent. |
693 | */ |
694 | static void |
695 | pppasyncstart(struct ppp_softc *sc) |
696 | { |
697 | struct tty *tp = (struct tty *) sc->sc_devp; |
698 | struct mbuf *m; |
699 | int len; |
700 | u_char *start, *stop, *cp; |
701 | int n, ndone, done, idle; |
702 | struct mbuf *m2; |
703 | |
704 | if (sc->sc_flags & SC_SYNC){ |
705 | pppsyncstart(sc); |
706 | return; |
707 | } |
708 | |
709 | mutex_spin_enter(&tty_lock); |
710 | |
711 | idle = 0; |
712 | while (CCOUNT(&tp->t_outq) < PPP_HIWAT) { |
713 | /* |
714 | * See if we have an existing packet partly sent. |
715 | * If not, get a new packet and start sending it. |
716 | */ |
717 | m = sc->sc_outm; |
718 | if (m == NULL) { |
719 | /* |
720 | * Get another packet to be sent. |
721 | */ |
722 | m = ppp_dequeue(sc); |
723 | if (m == NULL) { |
724 | idle = 1; |
725 | break; |
726 | } |
727 | |
728 | /* |
729 | * The extra PPP_FLAG will start up a new packet, and thus |
730 | * will flush any accumulated garbage. We do this whenever |
731 | * the line may have been idle for some time. |
732 | */ |
733 | if (CCOUNT(&tp->t_outq) == 0) { |
734 | ++sc->sc_stats.ppp_obytes; |
735 | (void) putc(PPP_FLAG, &tp->t_outq); |
736 | } |
737 | |
738 | /* Calculate the FCS for the first mbuf's worth. */ |
739 | sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, uint8_t *), m->m_len); |
740 | } |
741 | |
742 | for (;;) { |
743 | start = mtod(m, u_char *); |
744 | len = m->m_len; |
745 | stop = start + len; |
746 | while (len > 0) { |
747 | /* |
748 | * Find out how many bytes in the string we can |
749 | * handle without doing something special. |
750 | */ |
751 | for (cp = start; cp < stop; cp++) |
752 | if (ESCAPE_P(*cp)) |
753 | break; |
754 | n = cp - start; |
755 | if (n) { |
756 | /* NetBSD (0.9 or later), 4.3-Reno or similar. */ |
757 | ndone = n - b_to_q(start, n, &tp->t_outq); |
758 | len -= ndone; |
759 | start += ndone; |
760 | sc->sc_stats.ppp_obytes += ndone; |
761 | |
762 | if (ndone < n) |
763 | break; /* packet doesn't fit */ |
764 | } |
765 | /* |
766 | * If there are characters left in the mbuf, |
767 | * the first one must be special. |
768 | * Put it out in a different form. |
769 | */ |
770 | if (len) { |
771 | if (putc(PPP_ESCAPE, &tp->t_outq)) |
772 | break; |
773 | if (putc(*start ^ PPP_TRANS, &tp->t_outq)) { |
774 | (void) unputc(&tp->t_outq); |
775 | break; |
776 | } |
777 | sc->sc_stats.ppp_obytes += 2; |
778 | start++; |
779 | len--; |
780 | } |
781 | } |
782 | |
783 | /* |
784 | * If we didn't empty this mbuf, remember where we're up to. |
785 | * If we emptied the last mbuf, try to add the FCS and closing |
786 | * flag, and if we can't, leave sc_outm pointing to m, but with |
787 | * m->m_len == 0, to remind us to output the FCS and flag later. |
788 | */ |
789 | done = len == 0; |
790 | if (done && m->m_next == NULL) { |
791 | u_char *p, *q; |
792 | int c; |
793 | u_char endseq[8]; |
794 | |
795 | /* |
796 | * We may have to escape the bytes in the FCS. |
797 | */ |
798 | p = endseq; |
799 | c = ~sc->sc_outfcs & 0xFF; |
800 | if (ESCAPE_P(c)) { |
801 | *p++ = PPP_ESCAPE; |
802 | *p++ = c ^ PPP_TRANS; |
803 | } else |
804 | *p++ = c; |
805 | c = (~sc->sc_outfcs >> 8) & 0xFF; |
806 | if (ESCAPE_P(c)) { |
807 | *p++ = PPP_ESCAPE; |
808 | *p++ = c ^ PPP_TRANS; |
809 | } else |
810 | *p++ = c; |
811 | *p++ = PPP_FLAG; |
812 | |
813 | /* |
814 | * Try to output the FCS and flag. If the bytes |
815 | * don't all fit, back out. |
816 | */ |
817 | for (q = endseq; q < p; ++q) |
818 | if (putc(*q, &tp->t_outq)) { |
819 | done = 0; |
820 | for (; q > endseq; --q) |
821 | unputc(&tp->t_outq); |
822 | break; |
823 | } |
824 | if (done) |
825 | sc->sc_stats.ppp_obytes += q - endseq; |
826 | } |
827 | |
828 | if (!done) { |
829 | /* remember where we got to */ |
830 | m->m_data = start; |
831 | m->m_len = len; |
832 | break; |
833 | } |
834 | |
835 | /* Finished with this mbuf; free it and move on. */ |
836 | m = m2 = m_free(m); |
837 | if (m == NULL) { |
838 | /* Finished a packet */ |
839 | break; |
840 | } |
841 | sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, uint8_t *), m->m_len); |
842 | } |
843 | |
844 | /* |
845 | * If m == NULL, we have finished a packet. |
846 | * If m != NULL, we've either done as much work this time |
847 | * as we need to, or else we've filled up the output queue. |
848 | */ |
849 | sc->sc_outm = m; |
850 | if (m) |
851 | break; |
852 | } |
853 | |
854 | /* Call pppstart to start output again if necessary. */ |
855 | pppstart(tp); |
856 | |
857 | /* |
858 | * This timeout is needed for operation on a pseudo-tty, |
859 | * because the pty code doesn't call pppstart after it has |
860 | * drained the t_outq. |
861 | */ |
862 | if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) { |
863 | callout_reset(&sc->sc_timo_ch, 1, ppp_timeout, sc); |
864 | sc->sc_flags |= SC_TIMEOUT; |
865 | } |
866 | |
867 | mutex_spin_exit(&tty_lock); |
868 | } |
869 | |
870 | /* |
871 | * This gets called when a received packet is placed on |
872 | * the inq, at splsoftnet. |
873 | */ |
874 | static void |
875 | pppasyncctlp(struct ppp_softc *sc) |
876 | { |
877 | struct tty *tp; |
878 | |
879 | /* Put a placeholder byte in canq for ttselect()/ttnread(). */ |
880 | mutex_spin_enter(&tty_lock); |
881 | tp = (struct tty *) sc->sc_devp; |
882 | putc(0, &tp->t_canq); |
883 | ttwakeup(tp); |
884 | mutex_spin_exit(&tty_lock); |
885 | } |
886 | |
887 | /* |
888 | * Start output on async tty interface. If the transmit queue |
889 | * has drained sufficiently, arrange for pppasyncstart to be |
890 | * called later at splsoftnet. |
891 | * Called at spltty or higher. |
892 | */ |
893 | static int |
894 | pppstart(struct tty *tp) |
895 | { |
896 | struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc; |
897 | |
898 | /* |
899 | * If there is stuff in the output queue, send it now. |
900 | * We are being called in lieu of ttstart and must do what it would. |
901 | */ |
902 | if (tp->t_oproc != NULL) |
903 | (*tp->t_oproc)(tp); |
904 | |
905 | /* |
906 | * If the transmit queue has drained and the tty has not hung up |
907 | * or been disconnected from the ppp unit, then tell if_ppp.c that |
908 | * we need more output. |
909 | */ |
910 | if ((CCOUNT(&tp->t_outq) >= PPP_LOWAT) |
911 | && ((sc == NULL) || (sc->sc_flags & SC_TIMEOUT))) |
912 | return 0; |
913 | #ifdef ALTQ |
914 | /* |
915 | * if ALTQ is enabled, don't invoke NETISR_PPP. |
916 | * pppintr() could loop without doing anything useful |
917 | * under rate-limiting. |
918 | */ |
919 | if (ALTQ_IS_ENABLED(&sc->sc_if.if_snd)) |
920 | return 0; |
921 | #endif |
922 | if (!((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0) |
923 | && sc != NULL && tp == (struct tty *) sc->sc_devp) { |
924 | ppp_restart(sc); |
925 | } |
926 | |
927 | return 0; |
928 | } |
929 | |
930 | /* |
931 | * Timeout routine - try to start some more output. |
932 | */ |
933 | static void |
934 | ppp_timeout(void *x) |
935 | { |
936 | struct ppp_softc *sc = (struct ppp_softc *) x; |
937 | struct tty *tp = (struct tty *) sc->sc_devp; |
938 | |
939 | mutex_spin_enter(&tty_lock); |
940 | sc->sc_flags &= ~SC_TIMEOUT; |
941 | pppstart(tp); |
942 | mutex_spin_exit(&tty_lock); |
943 | } |
944 | |
945 | /* |
946 | * Allocate enough mbuf to handle current MRU. |
947 | */ |
948 | static void |
949 | pppgetm(struct ppp_softc *sc) |
950 | { |
951 | struct mbuf *m, **mp; |
952 | int len; |
953 | |
954 | mp = &sc->sc_m; |
955 | for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){ |
956 | if ((m = *mp) == NULL) { |
957 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
958 | if (m == NULL) |
959 | break; |
960 | *mp = m; |
961 | MCLGET(m, M_DONTWAIT); |
962 | } |
963 | len -= M_DATASIZE(m); |
964 | mp = &m->m_next; |
965 | } |
966 | } |
967 | |
968 | /* |
969 | * tty interface receiver interrupt. |
970 | */ |
971 | static const unsigned paritytab[8] = { |
972 | 0x96696996, 0x69969669, 0x69969669, 0x96696996, |
973 | 0x69969669, 0x96696996, 0x96696996, 0x69969669 |
974 | }; |
975 | |
976 | static int |
977 | pppinput(int c, struct tty *tp) |
978 | { |
979 | struct ppp_softc *sc; |
980 | struct mbuf *m; |
981 | int ilen, s; |
982 | int result; |
983 | |
984 | sc = (struct ppp_softc *) tp->t_sc; |
985 | if (sc == NULL || tp != (struct tty *) sc->sc_devp) |
986 | return 0; |
987 | |
988 | ++tk_nin; |
989 | ++sc->sc_stats.ppp_ibytes; |
990 | |
991 | if (c & TTY_FE) { |
992 | /* framing error or overrun on this char - abort packet */ |
993 | if (sc->sc_flags & SC_DEBUG) |
994 | printf("%s: bad char %x\n" , sc->sc_if.if_xname, c); |
995 | goto flush; |
996 | } |
997 | |
998 | c &= 0xff; |
999 | |
1000 | /* |
1001 | * Handle software flow control of output. |
1002 | */ |
1003 | result = tty_try_xonxoff(tp, c); |
1004 | if (result == 0) { |
1005 | /* Character was recognized and consumed. */ |
1006 | return 0; |
1007 | } |
1008 | /* Character wasn't consumed, continue processing it. */ |
1009 | |
1010 | s = spltty(); |
1011 | if (c & 0x80) |
1012 | sc->sc_flags |= SC_RCV_B7_1; |
1013 | else |
1014 | sc->sc_flags |= SC_RCV_B7_0; |
1015 | if (paritytab[c >> 5] & (1 << (c & 0x1F))) |
1016 | sc->sc_flags |= SC_RCV_ODDP; |
1017 | else |
1018 | sc->sc_flags |= SC_RCV_EVNP; |
1019 | splx(s); |
1020 | |
1021 | ppplogchar(sc, c); |
1022 | |
1023 | if (c == PPP_FLAG) { |
1024 | ilen = sc->sc_ilen; |
1025 | sc->sc_ilen = 0; |
1026 | |
1027 | if ((sc->sc_flags & SC_LOG_RAWIN) && sc->sc_rawin.count > 0) |
1028 | ppplogchar(sc, -1); |
1029 | |
1030 | /* |
1031 | * If SC_ESCAPED is set, then we've seen the packet |
1032 | * abort sequence "}~". |
1033 | */ |
1034 | if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED) |
1035 | || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) { |
1036 | s = spltty(); |
1037 | sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */ |
1038 | if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){ |
1039 | if (sc->sc_flags & SC_DEBUG) |
1040 | printf("%s: bad fcs %x\n" , sc->sc_if.if_xname, |
1041 | sc->sc_fcs); |
1042 | sc->sc_if.if_ierrors++; |
1043 | sc->sc_stats.ppp_ierrors++; |
1044 | } else |
1045 | sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED); |
1046 | splx(s); |
1047 | return 0; |
1048 | } |
1049 | |
1050 | if (ilen < PPP_HDRLEN + PPP_FCSLEN) { |
1051 | if (ilen) { |
1052 | if (sc->sc_flags & SC_DEBUG) |
1053 | printf("%s: too short (%d)\n" , sc->sc_if.if_xname, ilen); |
1054 | s = spltty(); |
1055 | sc->sc_if.if_ierrors++; |
1056 | sc->sc_stats.ppp_ierrors++; |
1057 | sc->sc_flags |= SC_PKTLOST; |
1058 | splx(s); |
1059 | } |
1060 | return 0; |
1061 | } |
1062 | |
1063 | /* |
1064 | * Remove FCS trailer. Somewhat painful... |
1065 | */ |
1066 | ilen -= 2; |
1067 | if (--sc->sc_mc->m_len == 0) { |
1068 | for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next) |
1069 | ; |
1070 | sc->sc_mc = m; |
1071 | } |
1072 | sc->sc_mc->m_len--; |
1073 | |
1074 | /* excise this mbuf chain */ |
1075 | m = sc->sc_m; |
1076 | sc->sc_m = sc->sc_mc->m_next; |
1077 | sc->sc_mc->m_next = NULL; |
1078 | |
1079 | ppppktin(sc, m, sc->sc_flags & SC_PKTLOST); |
1080 | if (sc->sc_flags & SC_PKTLOST) { |
1081 | s = spltty(); |
1082 | sc->sc_flags &= ~SC_PKTLOST; |
1083 | splx(s); |
1084 | } |
1085 | |
1086 | pppgetm(sc); |
1087 | return 0; |
1088 | } |
1089 | |
1090 | if (sc->sc_flags & SC_FLUSH) { |
1091 | if (sc->sc_flags & SC_LOG_FLUSH) |
1092 | ppplogchar(sc, c); |
1093 | return 0; |
1094 | } |
1095 | |
1096 | if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) |
1097 | return 0; |
1098 | |
1099 | s = spltty(); |
1100 | if (sc->sc_flags & SC_ESCAPED) { |
1101 | sc->sc_flags &= ~SC_ESCAPED; |
1102 | c ^= PPP_TRANS; |
1103 | } else if (c == PPP_ESCAPE) { |
1104 | sc->sc_flags |= SC_ESCAPED; |
1105 | splx(s); |
1106 | return 0; |
1107 | } |
1108 | splx(s); |
1109 | |
1110 | /* |
1111 | * Initialize buffer on first octet received. |
1112 | * First octet could be address or protocol (when compressing |
1113 | * address/control). |
1114 | * Second octet is control. |
1115 | * Third octet is first or second (when compressing protocol) |
1116 | * octet of protocol. |
1117 | * Fourth octet is second octet of protocol. |
1118 | */ |
1119 | if (sc->sc_ilen == 0) { |
1120 | /* reset the first input mbuf */ |
1121 | if (sc->sc_m == NULL) { |
1122 | pppgetm(sc); |
1123 | if (sc->sc_m == NULL) { |
1124 | if (sc->sc_flags & SC_DEBUG) |
1125 | printf("%s: no input mbufs!\n" , sc->sc_if.if_xname); |
1126 | goto flush; |
1127 | } |
1128 | } |
1129 | m = sc->sc_m; |
1130 | m->m_len = 0; |
1131 | m->m_data = M_DATASTART(sc->sc_m); |
1132 | sc->sc_mc = m; |
1133 | sc->sc_mp = mtod(m, char *); |
1134 | sc->sc_fcs = PPP_INITFCS; |
1135 | if (c != PPP_ALLSTATIONS) { |
1136 | if (sc->sc_flags & SC_REJ_COMP_AC) { |
1137 | if (sc->sc_flags & SC_DEBUG) |
1138 | printf("%s: garbage received: 0x%x (need 0xFF)\n" , |
1139 | sc->sc_if.if_xname, c); |
1140 | goto flush; |
1141 | } |
1142 | *sc->sc_mp++ = PPP_ALLSTATIONS; |
1143 | *sc->sc_mp++ = PPP_UI; |
1144 | sc->sc_ilen += 2; |
1145 | m->m_len += 2; |
1146 | } |
1147 | } |
1148 | if (sc->sc_ilen == 1 && c != PPP_UI) { |
1149 | if (sc->sc_flags & SC_DEBUG) |
1150 | printf("%s: missing UI (0x3), got 0x%x\n" , |
1151 | sc->sc_if.if_xname, c); |
1152 | goto flush; |
1153 | } |
1154 | if (sc->sc_ilen == 2 && (c & 1) == 1) { |
1155 | /* a compressed protocol */ |
1156 | *sc->sc_mp++ = 0; |
1157 | sc->sc_ilen++; |
1158 | sc->sc_mc->m_len++; |
1159 | } |
1160 | if (sc->sc_ilen == 3 && (c & 1) == 0) { |
1161 | if (sc->sc_flags & SC_DEBUG) |
1162 | printf("%s: bad protocol %x\n" , sc->sc_if.if_xname, |
1163 | (sc->sc_mp[-1] << 8) + c); |
1164 | goto flush; |
1165 | } |
1166 | |
1167 | /* packet beyond configured mru? */ |
1168 | if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) { |
1169 | if (sc->sc_flags & SC_DEBUG) |
1170 | printf("%s: packet too big\n" , sc->sc_if.if_xname); |
1171 | goto flush; |
1172 | } |
1173 | |
1174 | /* is this mbuf full? */ |
1175 | m = sc->sc_mc; |
1176 | if (M_TRAILINGSPACE(m) <= 0) { |
1177 | if (m->m_next == NULL) { |
1178 | pppgetm(sc); |
1179 | if (m->m_next == NULL) { |
1180 | if (sc->sc_flags & SC_DEBUG) |
1181 | printf("%s: too few input mbufs!\n" , sc->sc_if.if_xname); |
1182 | goto flush; |
1183 | } |
1184 | } |
1185 | sc->sc_mc = m = m->m_next; |
1186 | m->m_len = 0; |
1187 | m->m_data = M_DATASTART(m); |
1188 | sc->sc_mp = mtod(m, char *); |
1189 | } |
1190 | |
1191 | ++m->m_len; |
1192 | *sc->sc_mp++ = c; |
1193 | sc->sc_fcs = PPP_FCS(sc->sc_fcs, c); |
1194 | return 0; |
1195 | |
1196 | flush: |
1197 | if (!(sc->sc_flags & SC_FLUSH)) { |
1198 | s = spltty(); |
1199 | sc->sc_if.if_ierrors++; |
1200 | sc->sc_stats.ppp_ierrors++; |
1201 | sc->sc_flags |= SC_FLUSH; |
1202 | splx(s); |
1203 | if (sc->sc_flags & SC_LOG_FLUSH) |
1204 | ppplogchar(sc, c); |
1205 | } |
1206 | return 0; |
1207 | } |
1208 | |
1209 | #define MAX_DUMP_BYTES 128 |
1210 | |
1211 | static void |
1212 | ppplogchar(struct ppp_softc *sc, int c) |
1213 | { |
1214 | if (c >= 0) { |
1215 | sc->sc_rawin.buf[sc->sc_rawin_start++] = c; |
1216 | if (sc->sc_rawin.count < sizeof(sc->sc_rawin.buf)) |
1217 | sc->sc_rawin.count++; |
1218 | } |
1219 | if (sc->sc_rawin_start >= sizeof(sc->sc_rawin.buf) |
1220 | || (c < 0 && sc->sc_rawin_start > 0)) { |
1221 | if (sc->sc_flags & (SC_LOG_FLUSH|SC_LOG_RAWIN)) { |
1222 | printf("%s input: " , sc->sc_if.if_xname); |
1223 | pppdumpb(sc->sc_rawin.buf, sc->sc_rawin_start); |
1224 | } |
1225 | if (c < 0) |
1226 | sc->sc_rawin.count = 0; |
1227 | sc->sc_rawin_start = 0; |
1228 | } |
1229 | } |
1230 | |
1231 | static void |
1232 | pppdumpb(u_char *b, int l) |
1233 | { |
1234 | char bf[3*MAX_DUMP_BYTES+4]; |
1235 | char *bp = bf; |
1236 | |
1237 | while (l--) { |
1238 | if (bp >= bf + sizeof(bf) - 3) { |
1239 | *bp++ = '>'; |
1240 | break; |
1241 | } |
1242 | *bp++ = hexdigits[*b >> 4]; /* convert byte to ascii hex */ |
1243 | *bp++ = hexdigits[*b++ & 0xf]; |
1244 | *bp++ = ' '; |
1245 | } |
1246 | |
1247 | *bp = 0; |
1248 | printf("%s\n" , bf); |
1249 | } |
1250 | |
1251 | static void |
1252 | pppdumpframe(struct ppp_softc *sc, struct mbuf *m, int xmit) |
1253 | { |
1254 | int i,lcount,copycount,count; |
1255 | char lbuf[16]; |
1256 | char *data; |
1257 | |
1258 | if (m == NULL) |
1259 | return; |
1260 | |
1261 | for(count=m->m_len,data=mtod(m,char*);m != NULL;) { |
1262 | /* build a line of output */ |
1263 | for(lcount=0;lcount < sizeof(lbuf);lcount += copycount) { |
1264 | if (!count) { |
1265 | m = m->m_next; |
1266 | if (m == NULL) |
1267 | break; |
1268 | count = m->m_len; |
1269 | data = mtod(m,char*); |
1270 | } |
1271 | copycount = (count > sizeof(lbuf)-lcount) ? |
1272 | sizeof(lbuf)-lcount : count; |
1273 | bcopy(data,&lbuf[lcount],copycount); |
1274 | data += copycount; |
1275 | count -= copycount; |
1276 | } |
1277 | |
1278 | /* output line (hex 1st, then ascii) */ |
1279 | printf("%s %s:" , sc->sc_if.if_xname, |
1280 | xmit ? "output" : "input " ); |
1281 | for(i=0;i<lcount;i++) |
1282 | printf("%02x " ,(u_char)lbuf[i]); |
1283 | for(;i<sizeof(lbuf);i++) |
1284 | printf(" " ); |
1285 | for(i=0;i<lcount;i++) |
1286 | printf("%c" ,(lbuf[i] >= 040 && |
1287 | lbuf[i] <= 0176) ? lbuf[i] : '.'); |
1288 | printf("\n" ); |
1289 | } |
1290 | } |
1291 | |