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).
73 /* $FreeBSD: src/sys/net/ppp_tty.c,v 1.43.2.1 2002/02/13 00:43:11 dillon Exp $ */
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>
92 #include <i386/isa/intr_machdep.h>
98 #include <net/if_ppp.h>
99 #include <net/if_pppvar.h>
101 static int pppopen __P((dev_t dev, struct tty *tp));
102 static int pppclose __P((struct tty *tp, int flag));
103 static int pppread __P((struct tty *tp, struct uio *uio, int flag));
104 static int pppwrite __P((struct tty *tp, struct uio *uio, int flag));
105 static int ppptioctl __P((struct tty *tp, u_long cmd, caddr_t data, int flag,
107 static int pppinput __P((int c, struct tty *tp));
108 static int pppstart __P((struct tty *tp));
110 static u_short pppfcs __P((u_short fcs, u_char *cp, int len));
111 static void pppasyncstart __P((struct ppp_softc *));
112 static void pppasyncctlp __P((struct ppp_softc *));
113 static void pppasyncrelinq __P((struct ppp_softc *));
114 static void pppasyncsetmtu __P((struct ppp_softc *));
115 static void ppp_timeout __P((void *));
116 static void pppgetm __P((struct ppp_softc *sc));
117 static void ppplogchar __P((struct ppp_softc *, int));
119 /* XXX called from if_ppp.c - layering violation */
120 void pppasyncattach __P((void *));
123 * Some useful mbuf macros not in mbuf.h.
125 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
127 #define M_DATASTART(m) \
128 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
129 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
131 #define M_DATASIZE(m) \
132 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
133 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
136 * Does c need to be escaped?
138 #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
141 * Procedures for using an async tty interface for PPP.
144 /* This is a FreeBSD-2.X kernel. */
145 #define CCOUNT(q) ((q)->c_cc)
146 #define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */
147 #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
150 * Define the PPP line discipline.
153 static struct linesw pppdisc = {
154 pppopen, pppclose, pppread, pppwrite,
155 ppptioctl, pppinput, pppstart, ttymodem,
160 pppasyncattach(dummy)
169 * Make sure that the soft net "engine" cannot run while spltty code is
170 * active. The if_ppp.c code can walk down into b_to_q etc, and it is
171 * bad if the tty system was in the middle of another b_to_q...
173 tty_imask |= softnet_imask; /* spltty() block spl[soft]net() */
174 net_imask |= softtty_imask; /* splimp() block splsofttty() */
175 net_imask |= tty_imask; /* splimp() block spltty() */
180 printf("new masks: bio %x, tty %x, net %x\n",
181 bio_imask, tty_imask, net_imask);
184 /* register line discipline */
185 linesw[PPPDISC] = pppdisc;
189 * Line specific open routine for async tty devices.
190 * Attach the given tty to the first available ppp unit.
191 * Called from device open routine or ttioctl() at >= splsofttty()
197 register struct tty *tp;
199 struct proc *p = curproc; /* XXX */
200 register struct ppp_softc *sc;
203 if ((error = suser(p)) != 0)
208 if (tp->t_line == PPPDISC) {
209 sc = (struct ppp_softc *) tp->t_sc;
210 if (sc != NULL && sc->sc_devp == (void *) tp) {
216 if ((sc = pppalloc(p->p_pid)) == NULL) {
222 (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
226 bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
227 sc->sc_asyncmap[0] = 0xffffffff;
228 sc->sc_asyncmap[3] = 0x60000000;
229 sc->sc_rasyncmap = 0;
230 sc->sc_devp = (void *) tp;
231 sc->sc_start = pppasyncstart;
232 sc->sc_ctlp = pppasyncctlp;
233 sc->sc_relinq = pppasyncrelinq;
234 sc->sc_setmtu = pppasyncsetmtu;
237 sc->sc_if.if_flags |= IFF_RUNNING;
238 getmicrotime(&sc->sc_if.if_lastchange);
239 sc->sc_if.if_baudrate = tp->t_ospeed;
241 tp->t_sc = (caddr_t) sc;
242 ttyflush(tp, FREAD | FWRITE);
245 * Pre-allocate cblocks to the "just right" amount. The 1 byte t_canq
246 * allocation helps avoid the need for select and/or FIONREAD.
247 * We also pass 1 byte tokens through t_canq...
249 clist_alloc_cblocks(&tp->t_canq, 1, 1);
250 clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
251 sc->sc_if.if_mtu + PPP_HIWAT);
252 clist_alloc_cblocks(&tp->t_rawq, 0, 0);
260 * Line specific close routine, called from device close routine
261 * and from ttioctl at >= splsofttty().
262 * Detach the tty from the ppp unit.
263 * Mimics part of ttyclose().
270 register struct ppp_softc *sc;
274 ttyflush(tp, FREAD | FWRITE);
275 clist_free_cblocks(&tp->t_canq);
276 clist_free_cblocks(&tp->t_outq);
278 sc = (struct ppp_softc *) tp->t_sc;
281 if (tp == (struct tty *) sc->sc_devp) {
291 * Relinquish the interface unit to another device.
295 struct ppp_softc *sc;
301 m_freem(sc->sc_outm);
308 if (sc->sc_flags & SC_TIMEOUT) {
309 untimeout(ppp_timeout, (void *) sc, sc->sc_ch);
310 sc->sc_flags &= ~SC_TIMEOUT;
316 * This gets called from the upper layer to notify a mtu change
320 register struct ppp_softc *sc;
322 register struct tty *tp = (struct tty *) sc->sc_devp;
327 clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
328 sc->sc_if.if_mtu + PPP_HIWAT);
333 * Line specific (tty) read routine.
334 * called at zero spl from the device driver in the response to user-level
335 * reads on the tty file descriptor (ie: pppd).
338 pppread(tp, uio, flag)
339 register struct tty *tp;
343 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
351 * Loop waiting for input, checking that nothing disasterous
352 * happens in the meantime.
356 if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
360 if (sc->sc_inq.ifq_head != NULL)
362 if ((tp->t_state & TS_CONNECTED) == 0) {
364 return 0; /* end of file */
366 if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
368 return (EWOULDBLOCK);
370 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, "pppin", 0);
377 /* Pull place-holder byte out of canonical queue */
380 /* Get the packet from the input queue */
381 IF_DEQUEUE(&sc->sc_inq, m0);
384 for (m = m0; m && uio->uio_resid; m = m->m_next)
385 if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0)
392 * Line specific (tty) write routine.
393 * called at zero spl from the device driver in the response to user-level
394 * writes on the tty file descriptor (ie: pppd).
397 pppwrite(tp, uio, flag)
398 register struct tty *tp;
402 register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
403 struct mbuf *m, *m0, **mp;
407 if ((tp->t_state & TS_CONNECTED) == 0)
408 return 0; /* wrote 0 bytes */
409 if (tp->t_line != PPPDISC)
411 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
413 if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
414 uio->uio_resid < PPP_HDRLEN)
418 for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
419 MGET(m, M_WAIT, MT_DATA);
420 if ((*mp = m) == NULL) {
426 if (uio->uio_resid >= MCLBYTES / 2)
427 MCLGET(m, M_DONTWAIT);
428 len = M_TRAILINGSPACE(m);
429 if (len > uio->uio_resid)
430 len = uio->uio_resid;
431 if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) {
438 dst.sa_family = AF_UNSPEC;
439 bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
440 m0->m_data += PPP_HDRLEN;
441 m0->m_len -= PPP_HDRLEN;
443 /* call the upper layer to "transmit" it... */
444 error = pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0);
450 * Line specific (tty) ioctl routine.
451 * This discipline requires that tty device drivers call
452 * the line specific l_ioctl routine from their ioctl routines.
456 ppptioctl(tp, cmd, data, flag, p)
463 struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
466 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
471 case PPPIOCSASYNCMAP:
472 if ((error = suser(p)) != 0)
474 sc->sc_asyncmap[0] = *(u_int *)data;
477 case PPPIOCGASYNCMAP:
478 *(u_int *)data = sc->sc_asyncmap[0];
481 case PPPIOCSRASYNCMAP:
482 if ((error = suser(p)) != 0)
484 sc->sc_rasyncmap = *(u_int *)data;
487 case PPPIOCGRASYNCMAP:
488 *(u_int *)data = sc->sc_rasyncmap;
491 case PPPIOCSXASYNCMAP:
492 if ((error = suser(p)) != 0)
495 bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
496 sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */
497 sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */
498 sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */
502 case PPPIOCGXASYNCMAP:
503 bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
507 error = pppioctl(sc, cmd, data, flag, p);
508 if (error == 0 && cmd == PPPIOCSMRU)
516 * FCS lookup table as calculated by genfcstab.
518 static u_short fcstab[256] = {
519 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
520 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
521 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
522 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
523 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
524 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
525 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
526 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
527 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
528 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
529 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
530 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
531 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
532 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
533 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
534 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
535 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
536 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
537 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
538 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
539 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
540 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
541 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
542 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
543 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
544 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
545 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
546 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
547 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
548 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
549 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
550 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
554 * Calculate a new FCS given the current FCS and the new data.
557 pppfcs(u_short fcs, u_char *cp, int len)
560 fcs = PPP_FCS(fcs, *cp++);
565 * This gets called at splsoftnet from if_ppp.c at various times
566 * when there is data ready to be sent.
570 register struct ppp_softc *sc;
572 register struct tty *tp = (struct tty *) sc->sc_devp;
573 register struct mbuf *m;
575 register u_char *start, *stop, *cp;
576 int n, ndone, done, idle;
580 /* XXX assumes atomic access to *tp although we're not at spltty(). */
581 while (CCOUNT(&tp->t_outq) < PPP_HIWAT) {
583 * See if we have an existing packet partly sent.
584 * If not, get a new packet and start sending it.
589 * Get another packet to be sent.
598 * The extra PPP_FLAG will start up a new packet, and thus
599 * will flush any accumulated garbage. We do this whenever
600 * the line may have been idle for some time.
603 if (CCOUNT(&tp->t_outq) == 0) {
604 ++sc->sc_stats.ppp_obytes;
605 (void) putc(PPP_FLAG, &tp->t_outq);
608 /* Calculate the FCS for the first mbuf's worth. */
609 sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
610 getmicrotime(&sc->sc_if.if_lastchange);
614 start = mtod(m, u_char *);
619 * Find out how many bytes in the string we can
620 * handle without doing something special.
622 for (cp = start; cp < stop; cp++)
627 /* NetBSD (0.9 or later), 4.3-Reno or similar. */
628 ndone = n - b_to_q(start, n, &tp->t_outq);
631 sc->sc_stats.ppp_obytes += ndone;
634 break; /* packet doesn't fit */
637 * If there are characters left in the mbuf,
638 * the first one must be special.
639 * Put it out in a different form.
643 if (putc(PPP_ESCAPE, &tp->t_outq)) {
647 if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
648 (void) unputc(&tp->t_outq);
653 sc->sc_stats.ppp_obytes += 2;
660 * If we didn't empty this mbuf, remember where we're up to.
661 * If we emptied the last mbuf, try to add the FCS and closing
662 * flag, and if we can't, leave sc_outm pointing to m, but with
663 * m->m_len == 0, to remind us to output the FCS and flag later.
666 if (done && m->m_next == NULL) {
672 * We may have to escape the bytes in the FCS.
675 c = ~sc->sc_outfcs & 0xFF;
678 *p++ = c ^ PPP_TRANS;
681 c = (~sc->sc_outfcs >> 8) & 0xFF;
684 *p++ = c ^ PPP_TRANS;
690 * Try to output the FCS and flag. If the bytes
691 * don't all fit, back out.
694 for (q = endseq; q < p; ++q)
695 if (putc(*q, &tp->t_outq)) {
697 for (; q > endseq; --q)
703 sc->sc_stats.ppp_obytes += q - endseq;
707 /* remember where we got to */
713 /* Finished with this mbuf; free it and move on. */
716 /* Finished a packet */
719 sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
723 * If m == NULL, we have finished a packet.
724 * If m != NULL, we've either done as much work this time
725 * as we need to, or else we've filled up the output queue.
732 /* Call pppstart to start output again if necessary. */
737 * This timeout is needed for operation on a pseudo-tty,
738 * because the pty code doesn't call pppstart after it has
739 * drained the t_outq.
741 if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
742 sc->sc_ch = timeout(ppp_timeout, (void *) sc, 1);
743 sc->sc_flags |= SC_TIMEOUT;
750 * This gets called when a received packet is placed on
751 * the inq, at splsoftnet. The pppd daemon is to be woken up to do a read().
755 struct ppp_softc *sc;
760 /* Put a placeholder byte in canq for ttselect()/ttnread(). */
762 tp = (struct tty *) sc->sc_devp;
763 putc(0, &tp->t_canq);
769 * Start output on async tty interface. If the transmit queue
770 * has drained sufficiently, arrange for pppasyncstart to be
771 * called later at splsoftnet.
772 * Called at spltty or higher.
776 register struct tty *tp;
778 register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
781 * Call output process whether or not there is any output.
782 * We are being called in lieu of ttstart and must do what it would.
784 if (tp->t_oproc != NULL)
788 * If the transmit queue has drained and the tty has not hung up
789 * or been disconnected from the ppp unit, then tell if_ppp.c that
790 * we need more output.
792 if (CCOUNT(&tp->t_outq) < PPP_LOWAT
793 && !((tp->t_state & TS_CONNECTED) == 0)
794 && sc != NULL && tp == (struct tty *) sc->sc_devp) {
802 * Timeout routine - try to start some more output.
808 struct ppp_softc *sc = (struct ppp_softc *) x;
809 struct tty *tp = (struct tty *) sc->sc_devp;
813 sc->sc_flags &= ~SC_TIMEOUT;
819 * Allocate enough mbuf to handle current MRU.
823 register struct ppp_softc *sc;
825 struct mbuf *m, **mp;
829 for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
830 if ((m = *mp) == NULL) {
831 MGETHDR(m, M_DONTWAIT, MT_DATA);
835 MCLGET(m, M_DONTWAIT);
837 len -= M_DATASIZE(m);
843 * tty interface receiver interrupt.
845 static unsigned paritytab[8] = {
846 0x96696996, 0x69969669, 0x69969669, 0x96696996,
847 0x69969669, 0x96696996, 0x96696996, 0x69969669
851 * Called when character is available from device driver.
852 * Only guaranteed to be at splsofttty() or spltty()
853 * This is safe to be called while the upper half's netisr is preempted.
858 register struct tty *tp;
860 register struct ppp_softc *sc;
864 sc = (struct ppp_softc *) tp->t_sc;
865 if (sc == NULL || tp != (struct tty *) sc->sc_devp)
869 ++sc->sc_stats.ppp_ibytes;
871 if ((tp->t_state & TS_CONNECTED) == 0) {
872 if (sc->sc_flags & SC_DEBUG)
873 printf("ppp%d: no carrier\n", sc->sc_if.if_unit);
877 if (c & TTY_ERRORMASK) {
878 /* framing error or overrun on this char - abort packet */
879 if (sc->sc_flags & SC_DEBUG)
880 printf("ppp%d: line error %x\n", sc->sc_if.if_unit,
888 * Handle software flow control of output.
890 if (tp->t_iflag & IXON) {
891 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
892 if ((tp->t_state & TS_TTSTOP) == 0) {
893 tp->t_state |= TS_TTSTOP;
898 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) {
899 tp->t_state &= ~TS_TTSTOP;
900 if (tp->t_oproc != NULL)
908 sc->sc_flags |= SC_RCV_B7_1;
910 sc->sc_flags |= SC_RCV_B7_0;
911 if (paritytab[c >> 5] & (1 << (c & 0x1F)))
912 sc->sc_flags |= SC_RCV_ODDP;
914 sc->sc_flags |= SC_RCV_EVNP;
917 if (sc->sc_flags & SC_LOG_RAWIN)
924 if (sc->sc_rawin_count > 0)
928 * If SC_ESCAPED is set, then we've seen the packet
929 * abort sequence "}~".
931 if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
932 || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) {
934 sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
935 if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
936 if (sc->sc_flags & SC_DEBUG)
937 printf("ppp%d: bad fcs %x, pkt len %d\n",
938 sc->sc_if.if_unit, sc->sc_fcs, ilen);
939 sc->sc_if.if_ierrors++;
940 sc->sc_stats.ppp_ierrors++;
942 sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
947 if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
949 if (sc->sc_flags & SC_DEBUG)
950 printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
952 sc->sc_if.if_ierrors++;
953 sc->sc_stats.ppp_ierrors++;
954 sc->sc_flags |= SC_PKTLOST;
961 * Remove FCS trailer. Somewhat painful...
964 if (--sc->sc_mc->m_len == 0) {
965 for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
971 /* excise this mbuf chain */
973 sc->sc_m = sc->sc_mc->m_next;
974 sc->sc_mc->m_next = NULL;
976 ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
977 if (sc->sc_flags & SC_PKTLOST) {
979 sc->sc_flags &= ~SC_PKTLOST;
987 if (sc->sc_flags & SC_FLUSH) {
988 if (sc->sc_flags & SC_LOG_FLUSH)
993 if (c < 0x20 && (sc->sc_rasyncmap & (1 << c)))
997 if (sc->sc_flags & SC_ESCAPED) {
998 sc->sc_flags &= ~SC_ESCAPED;
1000 } else if (c == PPP_ESCAPE) {
1001 sc->sc_flags |= SC_ESCAPED;
1008 * Initialize buffer on first octet received.
1009 * First octet could be address or protocol (when compressing
1011 * Second octet is control.
1012 * Third octet is first or second (when compressing protocol)
1013 * octet of protocol.
1014 * Fourth octet is second octet of protocol.
1016 if (sc->sc_ilen == 0) {
1017 /* reset the first input mbuf */
1018 if (sc->sc_m == NULL) {
1020 if (sc->sc_m == NULL) {
1021 if (sc->sc_flags & SC_DEBUG)
1022 printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
1028 m->m_data = M_DATASTART(sc->sc_m);
1030 sc->sc_mp = mtod(m, char *);
1031 sc->sc_fcs = PPP_INITFCS;
1032 if (c != PPP_ALLSTATIONS) {
1033 if (sc->sc_flags & SC_REJ_COMP_AC) {
1034 if (sc->sc_flags & SC_DEBUG)
1035 printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
1036 sc->sc_if.if_unit, c);
1039 *sc->sc_mp++ = PPP_ALLSTATIONS;
1040 *sc->sc_mp++ = PPP_UI;
1045 if (sc->sc_ilen == 1 && c != PPP_UI) {
1046 if (sc->sc_flags & SC_DEBUG)
1047 printf("ppp%d: missing UI (0x3), got 0x%x\n",
1048 sc->sc_if.if_unit, c);
1051 if (sc->sc_ilen == 2 && (c & 1) == 1) {
1052 /* a compressed protocol */
1057 if (sc->sc_ilen == 3 && (c & 1) == 0) {
1058 if (sc->sc_flags & SC_DEBUG)
1059 printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
1060 (sc->sc_mp[-1] << 8) + c);
1064 /* packet beyond configured mru? */
1065 if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
1066 if (sc->sc_flags & SC_DEBUG)
1067 printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
1071 /* is this mbuf full? */
1073 if (M_TRAILINGSPACE(m) <= 0) {
1074 if (m->m_next == NULL) {
1076 if (m->m_next == NULL) {
1077 if (sc->sc_flags & SC_DEBUG)
1078 printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
1082 sc->sc_mc = m = m->m_next;
1084 m->m_data = M_DATASTART(m);
1085 sc->sc_mp = mtod(m, char *);
1090 sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
1094 if (!(sc->sc_flags & SC_FLUSH)) {
1096 sc->sc_if.if_ierrors++;
1097 sc->sc_stats.ppp_ierrors++;
1098 sc->sc_flags |= SC_FLUSH;
1100 if (sc->sc_flags & SC_LOG_FLUSH)
1106 #define MAX_DUMP_BYTES 128
1110 struct ppp_softc *sc;
1114 sc->sc_rawin[sc->sc_rawin_count++] = c;
1115 if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
1116 || (c < 0 && sc->sc_rawin_count > 0)) {
1117 printf("ppp%d input: %*D", sc->sc_if.if_unit,
1118 sc->sc_rawin_count, sc->sc_rawin, " ");
1119 sc->sc_rawin_count = 0;