2 * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * Carnegie Mellon University
23 * Pittsburgh, PA 15213
28 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
30 * Copyright (c) 1987 Regents of the University of California.
31 * All rights reserved.
33 * Redistribution and use in source and binary forms are permitted
34 * provided that the above copyright notice and this paragraph are
35 * duplicated in all such forms and that any documentation,
36 * advertising materials, and other materials related to such
37 * distribution and use acknowledge that the software was developed
38 * by the University of California, Berkeley. The name of the
39 * University may not be used to endorse or promote products derived
40 * from this software without specific prior written permission.
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
42 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
43 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
45 * Serial Line interface
48 * Center for Seismic Studies
49 * 1300 N 17th Street, Suite 1450
50 * Arlington, Virginia 22209
55 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
56 * Converted to 4.3BSD Beta by Chris Torek.
57 * Other changes made at Berkeley, based in part on code by Kirk Smith.
59 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
60 * Added VJ tcp header compression; more unified ioctls
62 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
63 * Cleaned up a lot of the mbuf-related code to fix bugs that
64 * caused system crashes and packet corruption. Changed pppstart
65 * so that it doesn't just give up with a "collision" if the whole
66 * packet doesn't fit in the output ring buffer.
68 * Added priority queueing for interactive IP packets, following
69 * the model of if_sl.c, plus hooks for bpf.
70 * Paul Mackerras (paulus@cs.anu.edu.au).
75 #include "opt_ppp.h" /* XXX for ppp_defs.h */
77 #define VJC /* XXX for ppp_defs.h */
79 #include <sys/param.h>
80 #include <sys/systm.h>
83 #include <sys/dkstat.h>
84 #include <sys/socket.h>
85 #include <sys/fcntl.h>
89 #include <sys/vnode.h>
94 #include <net/if_ppp.h>
95 #include <net/if_pppvar.h>
97 static int pppopen(dev_t dev, struct tty *tp);
98 static int pppclose(struct tty *tp, int flag);
99 static int pppread(struct tty *tp, struct uio *uio, int flag);
100 static int pppwrite(struct tty *tp, struct uio *uio, int flag);
101 static int ppptioctl(struct tty *tp, u_long cmd, caddr_t data,
102 int flag, struct thread *td);
103 static int pppinput(int c, struct tty *tp);
104 static int pppstart(struct tty *tp);
106 static u_short pppfcs(u_short fcs, u_char *cp, int len);
107 static void pppasyncstart(struct ppp_softc *);
108 static void pppasyncctlp(struct ppp_softc *);
109 static void pppasyncrelinq(struct ppp_softc *);
110 static void pppasyncsetmtu(struct ppp_softc *);
111 static void ppp_timeout(void *);
112 static void pppgetm(struct ppp_softc *sc);
113 static void ppplogchar(struct ppp_softc *, int);
115 /* XXX called from if_ppp.c - layering violation */
116 void pppasyncattach(void *);
119 * Some useful mbuf macros not in mbuf.h.
121 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
123 #define M_DATASTART(m) \
124 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
125 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
127 #define M_DATASIZE(m) \
128 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
129 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
132 * Does c need to be escaped?
134 #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
137 * Procedures for using an async tty interface for PPP.
140 /* This is a FreeBSD-2.X kernel. */
141 #define CCOUNT(q) ((q)->c_cc)
142 #define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */
143 #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
146 * Define the PPP line discipline.
149 static struct linesw pppdisc = {
150 pppopen, pppclose, pppread, pppwrite,
151 ppptioctl, pppinput, pppstart, ttymodem,
156 pppasyncattach(dummy)
159 /* register line discipline */
160 linesw[PPPDISC] = pppdisc;
164 * Line specific open routine for async tty devices.
165 * Attach the given tty to the first available ppp unit.
166 * Called from device open routine or ttioctl() at >= splsofttty()
172 register struct tty *tp;
174 struct thread *td = curthread; /* XXX */
175 register struct ppp_softc *sc;
178 if ((error = suser(td)) != 0)
183 if (tp->t_line == PPPDISC) {
184 sc = (struct ppp_softc *) tp->t_sc;
185 if (sc != NULL && sc->sc_devp == (void *) tp) {
191 if ((sc = pppalloc(td->td_proc->p_pid)) == NULL) {
197 (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
201 bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
202 sc->sc_asyncmap[0] = 0xffffffff;
203 sc->sc_asyncmap[3] = 0x60000000;
204 sc->sc_rasyncmap = 0;
205 sc->sc_devp = (void *) tp;
206 sc->sc_start = pppasyncstart;
207 sc->sc_ctlp = pppasyncctlp;
208 sc->sc_relinq = pppasyncrelinq;
209 sc->sc_setmtu = pppasyncsetmtu;
212 sc->sc_if.if_flags |= IFF_RUNNING;
213 getmicrotime(&sc->sc_if.if_lastchange);
214 sc->sc_if.if_baudrate = tp->t_ospeed;
216 tp->t_sc = (caddr_t) sc;
217 ttyflush(tp, FREAD | FWRITE);
220 * Pre-allocate cblocks to the "just right" amount. The 1 byte t_canq
221 * allocation helps avoid the need for select and/or FIONREAD.
222 * We also pass 1 byte tokens through t_canq...
224 clist_alloc_cblocks(&tp->t_canq, 1, 1);
225 clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
226 sc->sc_if.if_mtu + PPP_HIWAT);
227 clist_alloc_cblocks(&tp->t_rawq, 0, 0);
235 * Line specific close routine, called from device close routine
236 * and from ttioctl at >= splsofttty().
237 * Detach the tty from the ppp unit.
238 * Mimics part of ttyclose().
245 register struct ppp_softc *sc;
249 ttyflush(tp, FREAD | FWRITE);
250 clist_free_cblocks(&tp->t_canq);
251 clist_free_cblocks(&tp->t_outq);
253 sc = (struct ppp_softc *) tp->t_sc;
256 if (tp == (struct tty *) sc->sc_devp) {
266 * Relinquish the interface unit to another device.
270 struct ppp_softc *sc;
276 m_freem(sc->sc_outm);
283 if (sc->sc_flags & SC_TIMEOUT) {
284 untimeout(ppp_timeout, (void *) sc, sc->sc_ch);
285 sc->sc_flags &= ~SC_TIMEOUT;
291 * This gets called from the upper layer to notify a mtu change
295 register struct ppp_softc *sc;
297 register struct tty *tp = (struct tty *) sc->sc_devp;
302 clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
303 sc->sc_if.if_mtu + PPP_HIWAT);
308 * Line specific (tty) read routine.
309 * called at zero spl from the device driver in the response to user-level
310 * reads on the tty file descriptor (ie: pppd).
313 pppread(tp, uio, flag)
314 register struct tty *tp;
318 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
326 * Loop waiting for input, checking that nothing disasterous
327 * happens in the meantime.
331 if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
335 if (sc->sc_inq.ifq_head != NULL)
337 if ((tp->t_state & TS_CONNECTED) == 0) {
339 return 0; /* end of file */
341 if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
343 return (EWOULDBLOCK);
345 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, "pppin", 0);
352 /* Pull place-holder byte out of canonical queue */
355 /* Get the packet from the input queue */
356 IF_DEQUEUE(&sc->sc_inq, m0);
359 for (m = m0; m && uio->uio_resid; m = m->m_next)
360 if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0)
367 * Line specific (tty) write routine.
368 * called at zero spl from the device driver in the response to user-level
369 * writes on the tty file descriptor (ie: pppd).
372 pppwrite(tp, uio, flag)
373 register struct tty *tp;
377 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
378 struct mbuf *m, *m0, **mp;
382 if ((tp->t_state & TS_CONNECTED) == 0)
383 return 0; /* wrote 0 bytes */
384 if (tp->t_line != PPPDISC)
386 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
388 if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
389 uio->uio_resid < PPP_HDRLEN)
393 for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
394 MGET(m, M_TRYWAIT, MT_DATA);
395 if ((*mp = m) == NULL) {
401 if (uio->uio_resid >= MCLBYTES / 2)
402 MCLGET(m, M_DONTWAIT);
403 len = M_TRAILINGSPACE(m);
404 if (len > uio->uio_resid)
405 len = uio->uio_resid;
406 if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) {
413 dst.sa_family = AF_UNSPEC;
414 bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
415 m0->m_data += PPP_HDRLEN;
416 m0->m_len -= PPP_HDRLEN;
418 /* call the upper layer to "transmit" it... */
419 error = pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0);
425 * Line specific (tty) ioctl routine.
426 * This discipline requires that tty device drivers call
427 * the line specific l_ioctl routine from their ioctl routines.
431 ppptioctl(tp, cmd, data, flag, td)
438 struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
441 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
446 case PPPIOCSASYNCMAP:
447 if ((error = suser(td)) != 0)
449 sc->sc_asyncmap[0] = *(u_int *)data;
452 case PPPIOCGASYNCMAP:
453 *(u_int *)data = sc->sc_asyncmap[0];
456 case PPPIOCSRASYNCMAP:
457 if ((error = suser(td)) != 0)
459 sc->sc_rasyncmap = *(u_int *)data;
462 case PPPIOCGRASYNCMAP:
463 *(u_int *)data = sc->sc_rasyncmap;
466 case PPPIOCSXASYNCMAP:
467 if ((error = suser(td)) != 0)
470 bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
471 sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */
472 sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */
473 sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */
477 case PPPIOCGXASYNCMAP:
478 bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
482 error = pppioctl(sc, cmd, data, flag, td);
483 if (error == 0 && cmd == PPPIOCSMRU)
491 * FCS lookup table as calculated by genfcstab.
493 static u_short fcstab[256] = {
494 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
495 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
496 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
497 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
498 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
499 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
500 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
501 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
502 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
503 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
504 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
505 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
506 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
507 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
508 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
509 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
510 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
511 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
512 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
513 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
514 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
515 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
516 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
517 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
518 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
519 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
520 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
521 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
522 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
523 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
524 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
525 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
529 * Calculate a new FCS given the current FCS and the new data.
532 pppfcs(u_short fcs, u_char *cp, int len)
535 fcs = PPP_FCS(fcs, *cp++);
540 * This gets called at splsoftnet from if_ppp.c at various times
541 * when there is data ready to be sent.
545 register struct ppp_softc *sc;
547 register struct tty *tp = (struct tty *) sc->sc_devp;
548 register struct mbuf *m;
550 register u_char *start, *stop, *cp;
551 int n, ndone, done, idle;
555 /* XXX assumes atomic access to *tp although we're not at spltty(). */
556 while (CCOUNT(&tp->t_outq) < PPP_HIWAT) {
558 * See if we have an existing packet partly sent.
559 * If not, get a new packet and start sending it.
564 * Get another packet to be sent.
573 * The extra PPP_FLAG will start up a new packet, and thus
574 * will flush any accumulated garbage. We do this whenever
575 * the line may have been idle for some time.
578 if (CCOUNT(&tp->t_outq) == 0) {
579 ++sc->sc_stats.ppp_obytes;
580 (void) putc(PPP_FLAG, &tp->t_outq);
583 /* Calculate the FCS for the first mbuf's worth. */
584 sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
585 getmicrotime(&sc->sc_if.if_lastchange);
589 start = mtod(m, u_char *);
594 * Find out how many bytes in the string we can
595 * handle without doing something special.
597 for (cp = start; cp < stop; cp++)
602 /* NetBSD (0.9 or later), 4.3-Reno or similar. */
603 ndone = n - b_to_q(start, n, &tp->t_outq);
606 sc->sc_stats.ppp_obytes += ndone;
609 break; /* packet doesn't fit */
612 * If there are characters left in the mbuf,
613 * the first one must be special.
614 * Put it out in a different form.
618 if (putc(PPP_ESCAPE, &tp->t_outq)) {
622 if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
623 (void) unputc(&tp->t_outq);
628 sc->sc_stats.ppp_obytes += 2;
635 * If we didn't empty this mbuf, remember where we're up to.
636 * If we emptied the last mbuf, try to add the FCS and closing
637 * flag, and if we can't, leave sc_outm pointing to m, but with
638 * m->m_len == 0, to remind us to output the FCS and flag later.
641 if (done && m->m_next == NULL) {
647 * We may have to escape the bytes in the FCS.
650 c = ~sc->sc_outfcs & 0xFF;
653 *p++ = c ^ PPP_TRANS;
656 c = (~sc->sc_outfcs >> 8) & 0xFF;
659 *p++ = c ^ PPP_TRANS;
665 * Try to output the FCS and flag. If the bytes
666 * don't all fit, back out.
669 for (q = endseq; q < p; ++q)
670 if (putc(*q, &tp->t_outq)) {
672 for (; q > endseq; --q)
678 sc->sc_stats.ppp_obytes += q - endseq;
682 /* remember where we got to */
688 /* Finished with this mbuf; free it and move on. */
691 /* Finished a packet */
694 sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
698 * If m == NULL, we have finished a packet.
699 * If m != NULL, we've either done as much work this time
700 * as we need to, or else we've filled up the output queue.
707 /* Call pppstart to start output again if necessary. */
712 * This timeout is needed for operation on a pseudo-tty,
713 * because the pty code doesn't call pppstart after it has
714 * drained the t_outq.
716 if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
717 sc->sc_ch = timeout(ppp_timeout, (void *) sc, 1);
718 sc->sc_flags |= SC_TIMEOUT;
725 * This gets called when a received packet is placed on
726 * the inq, at splsoftnet. The pppd daemon is to be woken up to do a read().
730 struct ppp_softc *sc;
735 /* Put a placeholder byte in canq for ttselect()/ttnread(). */
737 tp = (struct tty *) sc->sc_devp;
738 putc(0, &tp->t_canq);
744 * Start output on async tty interface. If the transmit queue
745 * has drained sufficiently, arrange for pppasyncstart to be
746 * called later at splsoftnet.
747 * Called at spltty or higher.
751 register struct tty *tp;
753 register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
756 * Call output process whether or not there is any output.
757 * We are being called in lieu of ttstart and must do what it would.
759 if (tp->t_oproc != NULL)
763 * If the transmit queue has drained and the tty has not hung up
764 * or been disconnected from the ppp unit, then tell if_ppp.c that
765 * we need more output.
767 if (CCOUNT(&tp->t_outq) < PPP_LOWAT
768 && !((tp->t_state & TS_CONNECTED) == 0)
769 && sc != NULL && tp == (struct tty *) sc->sc_devp) {
777 * Timeout routine - try to start some more output.
783 struct ppp_softc *sc = (struct ppp_softc *) x;
784 struct tty *tp = (struct tty *) sc->sc_devp;
788 sc->sc_flags &= ~SC_TIMEOUT;
794 * Allocate enough mbuf to handle current MRU.
798 register struct ppp_softc *sc;
800 struct mbuf *m, **mp;
804 for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
805 if ((m = *mp) == NULL) {
806 MGETHDR(m, M_DONTWAIT, MT_DATA);
810 MCLGET(m, M_DONTWAIT);
812 len -= M_DATASIZE(m);
818 * tty interface receiver interrupt.
820 static unsigned paritytab[8] = {
821 0x96696996, 0x69969669, 0x69969669, 0x96696996,
822 0x69969669, 0x96696996, 0x96696996, 0x69969669
826 * Called when character is available from device driver.
827 * Only guaranteed to be at splsofttty() or spltty()
828 * This is safe to be called while the upper half's netisr is preempted.
833 register struct tty *tp;
835 register struct ppp_softc *sc;
839 sc = (struct ppp_softc *) tp->t_sc;
840 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
844 ++sc->sc_stats.ppp_ibytes;
846 if ((tp->t_state & TS_CONNECTED) == 0) {
847 if (sc->sc_flags & SC_DEBUG)
848 printf("ppp%d: no carrier\n", sc->sc_if.if_unit);
852 if (c & TTY_ERRORMASK) {
853 /* framing error or overrun on this char - abort packet */
854 if (sc->sc_flags & SC_DEBUG)
855 printf("ppp%d: line error %x\n", sc->sc_if.if_unit,
863 * Handle software flow control of output.
865 if (tp->t_iflag & IXON) {
866 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
867 if ((tp->t_state & TS_TTSTOP) == 0) {
868 tp->t_state |= TS_TTSTOP;
873 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) {
874 tp->t_state &= ~TS_TTSTOP;
875 if (tp->t_oproc != NULL)
883 sc->sc_flags |= SC_RCV_B7_1;
885 sc->sc_flags |= SC_RCV_B7_0;
886 if (paritytab[c >> 5] & (1 << (c & 0x1F)))
887 sc->sc_flags |= SC_RCV_ODDP;
889 sc->sc_flags |= SC_RCV_EVNP;
892 if (sc->sc_flags & SC_LOG_RAWIN)
899 if (sc->sc_rawin_count > 0)
903 * If SC_ESCAPED is set, then we've seen the packet
904 * abort sequence "}~".
906 if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
907 || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) {
909 sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
910 if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
911 if (sc->sc_flags & SC_DEBUG)
912 printf("ppp%d: bad fcs %x, pkt len %d\n",
913 sc->sc_if.if_unit, sc->sc_fcs, ilen);
914 sc->sc_if.if_ierrors++;
915 sc->sc_stats.ppp_ierrors++;
917 sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
922 if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
924 if (sc->sc_flags & SC_DEBUG)
925 printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
927 sc->sc_if.if_ierrors++;
928 sc->sc_stats.ppp_ierrors++;
929 sc->sc_flags |= SC_PKTLOST;
936 * Remove FCS trailer. Somewhat painful...
939 if (--sc->sc_mc->m_len == 0) {
940 for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
946 /* excise this mbuf chain */
948 sc->sc_m = sc->sc_mc->m_next;
949 sc->sc_mc->m_next = NULL;
951 ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
952 if (sc->sc_flags & SC_PKTLOST) {
954 sc->sc_flags &= ~SC_PKTLOST;
962 if (sc->sc_flags & SC_FLUSH) {
963 if (sc->sc_flags & SC_LOG_FLUSH)
968 if (c < 0x20 && (sc->sc_rasyncmap & (1 << c)))
972 if (sc->sc_flags & SC_ESCAPED) {
973 sc->sc_flags &= ~SC_ESCAPED;
975 } else if (c == PPP_ESCAPE) {
976 sc->sc_flags |= SC_ESCAPED;
983 * Initialize buffer on first octet received.
984 * First octet could be address or protocol (when compressing
986 * Second octet is control.
987 * Third octet is first or second (when compressing protocol)
989 * Fourth octet is second octet of protocol.
991 if (sc->sc_ilen == 0) {
992 /* reset the first input mbuf */
993 if (sc->sc_m == NULL) {
995 if (sc->sc_m == NULL) {
996 if (sc->sc_flags & SC_DEBUG)
997 printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
1003 m->m_data = M_DATASTART(sc->sc_m);
1005 sc->sc_mp = mtod(m, char *);
1006 sc->sc_fcs = PPP_INITFCS;
1007 if (c != PPP_ALLSTATIONS) {
1008 if (sc->sc_flags & SC_REJ_COMP_AC) {
1009 if (sc->sc_flags & SC_DEBUG)
1010 printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
1011 sc->sc_if.if_unit, c);
1014 *sc->sc_mp++ = PPP_ALLSTATIONS;
1015 *sc->sc_mp++ = PPP_UI;
1020 if (sc->sc_ilen == 1 && c != PPP_UI) {
1021 if (sc->sc_flags & SC_DEBUG)
1022 printf("ppp%d: missing UI (0x3), got 0x%x\n",
1023 sc->sc_if.if_unit, c);
1026 if (sc->sc_ilen == 2 && (c & 1) == 1) {
1027 /* a compressed protocol */
1032 if (sc->sc_ilen == 3 && (c & 1) == 0) {
1033 if (sc->sc_flags & SC_DEBUG)
1034 printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
1035 (sc->sc_mp[-1] << 8) + c);
1039 /* packet beyond configured mru? */
1040 if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
1041 if (sc->sc_flags & SC_DEBUG)
1042 printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
1046 /* is this mbuf full? */
1048 if (M_TRAILINGSPACE(m) <= 0) {
1049 if (m->m_next == NULL) {
1051 if (m->m_next == NULL) {
1052 if (sc->sc_flags & SC_DEBUG)
1053 printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
1057 sc->sc_mc = m = m->m_next;
1059 m->m_data = M_DATASTART(m);
1060 sc->sc_mp = mtod(m, char *);
1065 sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
1069 if (!(sc->sc_flags & SC_FLUSH)) {
1071 sc->sc_if.if_ierrors++;
1072 sc->sc_stats.ppp_ierrors++;
1073 sc->sc_flags |= SC_FLUSH;
1075 if (sc->sc_flags & SC_LOG_FLUSH)
1081 #define MAX_DUMP_BYTES 128
1085 struct ppp_softc *sc;
1089 sc->sc_rawin[sc->sc_rawin_count++] = c;
1090 if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
1091 || (c < 0 && sc->sc_rawin_count > 0)) {
1092 printf("ppp%d input: %*D", sc->sc_if.if_unit,
1093 sc->sc_rawin_count, sc->sc_rawin, " ");
1094 sc->sc_rawin_count = 0;