1 /* $Id: ppp_tty.c,v 1.2 1996/04/04 03:21:36 paulus Exp $ */
4 * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
7 * Copyright (c) 1989 Carnegie Mellon University.
10 * Redistribution and use in source and binary forms are permitted
11 * provided that the above copyright notice and this paragraph are
12 * duplicated in all such forms and that any documentation,
13 * advertising materials, and other materials related to such
14 * distribution and use acknowledge that the software was developed
15 * by Carnegie Mellon University. The name of the
16 * University may not be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
20 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
23 * Carnegie Mellon University
25 * Pittsburgh, PA 15213
30 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
32 * Copyright (c) 1987 Regents of the University of California.
33 * All rights reserved.
35 * Redistribution and use in source and binary forms are permitted
36 * provided that the above copyright notice and this paragraph are
37 * duplicated in all such forms and that any documentation,
38 * advertising materials, and other materials related to such
39 * distribution and use acknowledge that the software was developed
40 * by the University of California, Berkeley. The name of the
41 * University may not be used to endorse or promote products derived
42 * from this software without specific prior written permission.
43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
44 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
45 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
47 * Serial Line interface
50 * Center for Seismic Studies
51 * 1300 N 17th Street, Suite 1450
52 * Arlington, Virginia 22209
57 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
58 * Converted to 4.3BSD Beta by Chris Torek.
59 * Other changes made at Berkeley, based in part on code by Kirk Smith.
61 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
62 * Added VJ tcp header compression; more unified ioctls
64 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
65 * Cleaned up a lot of the mbuf-related code to fix bugs that
66 * caused system crashes and packet corruption. Changed pppstart
67 * so that it doesn't just give up with a collision if the whole
68 * packet doesn't fit in the output ring buffer.
70 * Added priority queueing for interactive IP packets, following
71 * the model of if_sl.c, plus hooks for bpf.
72 * Paul Mackerras (paulus@cs.anu.edu.au).
75 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
76 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
84 #include <sys/param.h>
87 #include <sys/dkstat.h>
88 #include <sys/socket.h>
89 #include <sys/ioctl.h>
92 #include <sys/kernel.h>
94 #include <sys/vnode.h>
95 #include <sys/systm.h>
98 #include <net/if_types.h>
101 #include <netinet/in.h>
102 #include <netinet/in_systm.h>
103 #include <netinet/ip.h>
104 #include <net/slcompress.h>
108 #include <net/ppp_defs.h>
109 #include <net/if_ppp.h>
110 #include <net/if_pppvar.h>
112 int pppopen __P((dev_t dev, struct tty *tp));
113 int pppclose __P((struct tty *tp, int flag));
114 int pppread __P((struct tty *tp, struct uio *uio, int flag));
115 int pppwrite __P((struct tty *tp, struct uio *uio, int flag));
116 int ppptioctl __P((struct tty *tp, u_long cmd, caddr_t data, int flag,
118 int pppinput __P((int c, struct tty *tp));
119 int pppstart __P((struct tty *tp));
121 static u_int16_t pppfcs __P((u_int16_t fcs, u_char *cp, int len));
122 static void pppasyncstart __P((struct ppp_softc *));
123 static void pppasyncctlp __P((struct ppp_softc *));
124 static void pppasyncrelinq __P((struct ppp_softc *));
125 static void ppp_timeout __P((void *));
126 static void pppgetm __P((struct ppp_softc *sc));
127 static void pppdumpb __P((u_char *b, int l));
128 static void ppplogchar __P((struct ppp_softc *, int));
131 * Some useful mbuf macros not in mbuf.h.
133 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
135 #define M_DATASTART(m) \
136 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
137 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
139 #define M_DATASIZE(m) \
140 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
141 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
144 * Does c need to be escaped?
146 #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
149 * Procedures for using an async tty interface for PPP.
152 /* This is a NetBSD-1.0 or later kernel. */
153 #define CCOUNT(q) ((q)->c_cc)
155 #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
158 * Line specific open routine for async tty devices.
159 * Attach the given tty to the first available ppp unit.
160 * Called from device open routine or ttioctl.
166 register struct tty *tp;
168 struct proc *p = curproc; /* XXX */
169 register struct ppp_softc *sc;
172 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
177 if (tp->t_line == PPPDISC) {
178 sc = (struct ppp_softc *) tp->t_sc;
179 if (sc != NULL && sc->sc_devp == (void *) tp) {
185 if ((sc = pppalloc(p->p_pid)) == NULL) {
191 (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
195 bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
196 sc->sc_asyncmap[0] = 0xffffffff;
197 sc->sc_asyncmap[3] = 0x60000000;
198 sc->sc_rasyncmap = 0;
199 sc->sc_devp = (void *) tp;
200 sc->sc_start = pppasyncstart;
201 sc->sc_ctlp = pppasyncctlp;
202 sc->sc_relinq = pppasyncrelinq;
205 sc->sc_if.if_flags |= IFF_RUNNING;
206 sc->sc_if.if_baudrate = tp->t_ospeed;
208 tp->t_sc = (caddr_t) sc;
209 ttyflush(tp, FREAD | FWRITE);
216 * Line specific close routine, called from device close routine
218 * Detach the tty from the ppp unit.
219 * Mimics part of ttyclose().
226 register struct ppp_softc *sc;
230 ttyflush(tp, FREAD|FWRITE);
232 sc = (struct ppp_softc *) tp->t_sc;
235 if (tp == (struct tty *) sc->sc_devp) {
245 * Relinquish the interface unit to another device.
249 struct ppp_softc *sc;
255 m_freem(sc->sc_outm);
262 if (sc->sc_flags & SC_TIMEOUT) {
263 untimeout(ppp_timeout, (void *) sc);
264 sc->sc_flags &= ~SC_TIMEOUT;
270 * Line specific (tty) read routine.
273 pppread(tp, uio, flag)
274 register struct tty *tp;
278 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
286 * Loop waiting for input, checking that nothing disasterous
287 * happens in the meantime.
291 if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
295 if (sc->sc_inq.ifq_head != NULL)
297 if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0
298 && (tp->t_state & TS_ISOPEN)) {
300 return 0; /* end of file */
302 if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
304 return (EWOULDBLOCK);
306 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI|PCATCH, ttyin, 0);
313 /* Pull place-holder byte out of canonical queue */
316 /* Get the packet from the input queue */
317 IF_DEQUEUE(&sc->sc_inq, m0);
320 for (m = m0; m && uio->uio_resid; m = m->m_next)
321 if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0)
328 * Line specific (tty) write routine.
331 pppwrite(tp, uio, flag)
332 register struct tty *tp;
336 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
337 struct mbuf *m, *m0, **mp;
341 if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
342 return 0; /* wrote 0 bytes */
343 if (tp->t_line != PPPDISC)
345 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
347 if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
348 uio->uio_resid < PPP_HDRLEN)
350 for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
351 MGET(m, M_WAIT, MT_DATA);
352 if ((*mp = m) == NULL) {
357 if (uio->uio_resid >= MCLBYTES / 2)
358 MCLGET(m, M_DONTWAIT);
359 len = M_TRAILINGSPACE(m);
360 if (len > uio->uio_resid)
361 len = uio->uio_resid;
362 if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) {
368 dst.sa_family = AF_UNSPEC;
369 bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
370 m0->m_data += PPP_HDRLEN;
371 m0->m_len -= PPP_HDRLEN;
372 return (pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0));
376 * Line specific (tty) ioctl routine.
377 * This discipline requires that tty device drivers call
378 * the line specific l_ioctl routine from their ioctl routines.
382 ppptioctl(tp, cmd, data, flag, p)
389 struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
392 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
397 case PPPIOCSASYNCMAP:
398 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
400 sc->sc_asyncmap[0] = *(u_int *)data;
403 case PPPIOCGASYNCMAP:
404 *(u_int *)data = sc->sc_asyncmap[0];
407 case PPPIOCSRASYNCMAP:
408 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
410 sc->sc_rasyncmap = *(u_int *)data;
413 case PPPIOCGRASYNCMAP:
414 *(u_int *)data = sc->sc_rasyncmap;
417 case PPPIOCSXASYNCMAP:
418 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
421 bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
422 sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */
423 sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */
424 sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */
428 case PPPIOCGXASYNCMAP:
429 bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
433 error = pppioctl(sc, cmd, data, flag, p);
434 if (error == 0 && cmd == PPPIOCSMRU)
442 * FCS lookup table as calculated by genfcstab.
444 static u_int16_t fcstab[256] = {
445 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
446 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
447 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
448 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
449 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
450 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
451 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
452 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
453 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
454 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
455 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
456 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
457 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
458 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
459 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
460 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
461 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
462 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
463 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
464 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
465 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
466 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
467 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
468 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
469 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
470 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
471 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
472 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
473 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
474 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
475 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
476 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
480 * Calculate a new FCS given the current FCS and the new data.
484 register u_int16_t fcs;
489 fcs = PPP_FCS(fcs, *cp++);
494 * This gets called from pppoutput when a new packet is
495 * put on a queue, at splsoftnet.
499 register struct ppp_softc *sc;
501 register struct tty *tp = (struct tty *) sc->sc_devp;
510 * This gets called when a received packet is placed on
511 * the inq, at splsoftnet.
515 struct ppp_softc *sc;
520 /* Put a placeholder byte in canq for ttselect()/ttnread(). */
522 tp = (struct tty *) sc->sc_devp;
523 putc(0, &tp->t_canq);
529 * Start output on async tty interface. Get another datagram
530 * to send from the interface queue and start sending it.
531 * Called at spltty or higher.
535 register struct tty *tp;
537 register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
538 register struct mbuf *m;
540 register u_char *start, *stop, *cp;
541 int n, ndone, done, idle;
544 if (((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
545 || sc == NULL || tp != (struct tty *) sc->sc_devp) {
546 if (tp->t_oproc != NULL)
552 while (CCOUNT(&tp->t_outq) < PPP_HIWAT) {
554 * See if we have an existing packet partly sent.
555 * If not, get a new packet and start sending it.
560 * Get another packet to be sent.
569 * The extra PPP_FLAG will start up a new packet, and thus
570 * will flush any accumulated garbage. We do this whenever
571 * the line may have been idle for some time.
573 if (CCOUNT(&tp->t_outq) == 0) {
574 ++sc->sc_stats.ppp_obytes;
575 (void) putc(PPP_FLAG, &tp->t_outq);
578 /* Calculate the FCS for the first mbuf's worth. */
579 sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
580 sc->sc_if.if_lastchange = time;
584 start = mtod(m, u_char *);
589 * Find out how many bytes in the string we can
590 * handle without doing something special.
592 for (cp = start; cp < stop; cp++)
597 /* NetBSD (0.9 or later), 4.3-Reno or similar. */
598 ndone = n - b_to_q(start, n, &tp->t_outq);
601 sc->sc_stats.ppp_obytes += ndone;
604 break; /* packet doesn't fit */
607 * If there are characters left in the mbuf,
608 * the first one must be special..
609 * Put it out in a different form.
612 if (putc(PPP_ESCAPE, &tp->t_outq))
614 if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
615 (void) unputc(&tp->t_outq);
618 sc->sc_stats.ppp_obytes += 2;
625 * If we didn't empty this mbuf, remember where we're up to.
626 * If we emptied the last mbuf, try to add the FCS and closing
627 * flag, and if we can't, leave sc_outm pointing to m, but with
628 * m->m_len == 0, to remind us to output the FCS and flag later.
631 if (done && m->m_next == NULL) {
637 * We may have to escape the bytes in the FCS.
640 c = ~sc->sc_outfcs & 0xFF;
643 *p++ = c ^ PPP_TRANS;
646 c = (~sc->sc_outfcs >> 8) & 0xFF;
649 *p++ = c ^ PPP_TRANS;
655 * Try to output the FCS and flag. If the bytes
656 * don't all fit, back out.
658 for (q = endseq; q < p; ++q)
659 if (putc(*q, &tp->t_outq)) {
661 for (; q > endseq; --q)
665 sc->sc_stats.ppp_obytes += q - endseq;
669 /* remember where we got to */
675 /* Finished with this mbuf; free it and move on. */
679 /* Finished a packet */
682 sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
686 * Here we have either finished a packet (m == NULL)
687 * or filled up the output queue (m != NULL).
695 * If there is stuff in the output queue, send it now.
696 * We are being called in lieu of ttstart and must do what it would.
698 if (tp->t_oproc != NULL)
702 * This timeout is needed for operation on a pseudo-tty,
703 * because the pty code doesn't call pppstart after it has
704 * drained the t_outq.
706 if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
707 timeout(ppp_timeout, (void *) sc, 1);
708 sc->sc_flags |= SC_TIMEOUT;
715 * Timeout routine - try to start some more output.
721 struct ppp_softc *sc = (struct ppp_softc *) x;
722 struct tty *tp = (struct tty *) sc->sc_devp;
726 sc->sc_flags &= ~SC_TIMEOUT;
732 * Allocate enough mbuf to handle current MRU.
736 register struct ppp_softc *sc;
738 struct mbuf *m, **mp;
744 for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
745 if ((m = *mp) == NULL) {
746 MGETHDR(m, M_DONTWAIT, MT_DATA);
750 MCLGET(m, M_DONTWAIT);
752 len -= M_DATASIZE(m);
759 * tty interface receiver interrupt.
761 static unsigned paritytab[8] = {
762 0x96696996, 0x69969669, 0x69969669, 0x96696996,
763 0x69969669, 0x96696996, 0x96696996, 0x69969669
769 register struct tty *tp;
771 register struct ppp_softc *sc;
775 sc = (struct ppp_softc *) tp->t_sc;
776 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
779 s = spltty(); /* should be unnecessary */
781 ++sc->sc_stats.ppp_ibytes;
784 /* framing error or overrun on this char - abort packet */
785 if (sc->sc_flags & SC_DEBUG)
786 printf("ppp%d: bad char %x\n", sc->sc_if.if_unit, c);
793 * Handle software flow control of output.
795 if (tp->t_iflag & IXON) {
796 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
797 if ((tp->t_state & TS_TTSTOP) == 0) {
798 tp->t_state |= TS_TTSTOP;
799 (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
803 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) {
804 tp->t_state &= ~TS_TTSTOP;
805 if (tp->t_oproc != NULL)
812 sc->sc_flags |= SC_RCV_B7_1;
814 sc->sc_flags |= SC_RCV_B7_0;
815 if (paritytab[c >> 5] & (1 << (c & 0x1F)))
816 sc->sc_flags |= SC_RCV_ODDP;
818 sc->sc_flags |= SC_RCV_EVNP;
820 if (sc->sc_flags & SC_LOG_RAWIN)
827 if (sc->sc_rawin_count > 0)
831 * If SC_ESCAPED is set, then we've seen the packet
832 * abort sequence "}~".
834 if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
835 || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) {
836 sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
837 if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
838 if (sc->sc_flags & SC_DEBUG)
839 printf("ppp%d: bad fcs %x\n", sc->sc_if.if_unit,
841 sc->sc_if.if_ierrors++;
842 sc->sc_stats.ppp_ierrors++;
844 sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
849 if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
851 if (sc->sc_flags & SC_DEBUG)
852 printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
853 sc->sc_if.if_ierrors++;
854 sc->sc_stats.ppp_ierrors++;
855 sc->sc_flags |= SC_PKTLOST;
862 * Remove FCS trailer. Somewhat painful...
865 if (--sc->sc_mc->m_len == 0) {
866 for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
872 /* excise this mbuf chain */
874 sc->sc_m = sc->sc_mc->m_next;
875 sc->sc_mc->m_next = NULL;
877 ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
878 sc->sc_flags &= ~SC_PKTLOST;
885 if (sc->sc_flags & SC_FLUSH) {
886 if (sc->sc_flags & SC_LOG_FLUSH)
892 if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) {
897 if (sc->sc_flags & SC_ESCAPED) {
898 sc->sc_flags &= ~SC_ESCAPED;
900 } else if (c == PPP_ESCAPE) {
901 sc->sc_flags |= SC_ESCAPED;
907 * Initialize buffer on first octet received.
908 * First octet could be address or protocol (when compressing
910 * Second octet is control.
911 * Third octet is first or second (when compressing protocol)
913 * Fourth octet is second octet of protocol.
915 if (sc->sc_ilen == 0) {
916 /* reset the first input mbuf */
917 if (sc->sc_m == NULL) {
919 if (sc->sc_m == NULL) {
920 if (sc->sc_flags & SC_DEBUG)
921 printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
927 m->m_data = M_DATASTART(sc->sc_m);
929 sc->sc_mp = mtod(m, char *);
930 sc->sc_fcs = PPP_INITFCS;
931 if (c != PPP_ALLSTATIONS) {
932 if (sc->sc_flags & SC_REJ_COMP_AC) {
933 if (sc->sc_flags & SC_DEBUG)
934 printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
935 sc->sc_if.if_unit, c);
938 *sc->sc_mp++ = PPP_ALLSTATIONS;
939 *sc->sc_mp++ = PPP_UI;
944 if (sc->sc_ilen == 1 && c != PPP_UI) {
945 if (sc->sc_flags & SC_DEBUG)
946 printf("ppp%d: missing UI (0x3), got 0x%x\n",
947 sc->sc_if.if_unit, c);
950 if (sc->sc_ilen == 2 && (c & 1) == 1) {
951 /* a compressed protocol */
956 if (sc->sc_ilen == 3 && (c & 1) == 0) {
957 if (sc->sc_flags & SC_DEBUG)
958 printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
959 (sc->sc_mp[-1] << 8) + c);
963 /* packet beyond configured mru? */
964 if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
965 if (sc->sc_flags & SC_DEBUG)
966 printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
970 /* is this mbuf full? */
972 if (M_TRAILINGSPACE(m) <= 0) {
973 if (m->m_next == NULL) {
975 if (m->m_next == NULL) {
976 if (sc->sc_flags & SC_DEBUG)
977 printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
981 sc->sc_mc = m = m->m_next;
983 m->m_data = M_DATASTART(m);
984 sc->sc_mp = mtod(m, char *);
989 sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
994 if (!(sc->sc_flags & SC_FLUSH)) {
995 sc->sc_if.if_ierrors++;
996 sc->sc_stats.ppp_ierrors++;
997 sc->sc_flags |= SC_FLUSH;
998 if (sc->sc_flags & SC_LOG_FLUSH)
1005 #define MAX_DUMP_BYTES 128
1009 struct ppp_softc *sc;
1013 sc->sc_rawin[sc->sc_rawin_count++] = c;
1014 if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
1015 || (c < 0 && sc->sc_rawin_count > 0)) {
1016 printf("ppp%d input: ", sc->sc_if.if_unit);
1017 pppdumpb(sc->sc_rawin, sc->sc_rawin_count);
1018 sc->sc_rawin_count = 0;
1027 char buf[3*MAX_DUMP_BYTES+4];
1029 static char digits[] = "0123456789abcdef";
1032 if (bp >= buf + sizeof(buf) - 3) {
1036 *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */
1037 *bp++ = digits[*b++ & 0xf];
1042 printf("%s\n", buf);
1045 #endif /* NPPP > 0 */