/* * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous * tty devices. * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Drew D. Perkins * Carnegie Mellon University * 4910 Forbes Ave. * Pittsburgh, PA 15213 * (412) 268-8576 * ddp@andrew.cmu.edu * * Based on: * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 * * Copyright (c) 1987 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Serial Line interface * * Rick Adams * Center for Seismic Studies * 1300 N 17th Street, Suite 1450 * Arlington, Virginia 22209 * (703)276-7900 * rick@seismo.ARPA * seismo!rick * * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). * Converted to 4.3BSD Beta by Chris Torek. * Other changes made at Berkeley, based in part on code by Kirk Smith. * * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) * Added VJ tcp header compression; more unified ioctls * * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). * Cleaned up a lot of the mbuf-related code to fix bugs that * caused system crashes and packet corruption. Changed pppstart * so that it doesn't just give up with a "collision" if the whole * packet doesn't fit in the output ring buffer. * * Added priority queueing for interactive IP packets, following * the model of if_sl.c, plus hooks for bpf. * Paul Mackerras (paulus@cs.anu.edu.au). */ /* $Id$ */ /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ #include "ppp.h" #if NPPP > 0 #include #include #include #include #include #include #include #include #include #include #ifdef VJC #include #include #include #include #endif #include #include #include #include #include #ifdef PPP_FILTER #include #endif #include #include #include void pppasyncattach __P((void)); int pppopen __P((struct rtems_termios_tty *tty)); int pppclose __P((struct rtems_termios_tty *tty)); int pppread __P((struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args)); int pppwrite __P((struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args)); int ppptioctl __P((struct rtems_termios_tty *tty, rtems_libio_ioctl_args_t *args)); int pppinput __P((int c, struct rtems_termios_tty *tty)); int pppstart __P((struct rtems_termios_tty *tp)); u_short pppfcs __P((u_short fcs, u_char *cp, int len)); void pppallocmbuf __P((struct ppp_softc *sc, struct mbuf **mp)); static void pppasyncstart __P((struct ppp_softc *)); static void pppasyncctlp __P((struct ppp_softc *)); static void pppasyncrelinq __P((struct ppp_softc *)); /*static void ppp_timeout __P((void *)); */ /*static void pppdumpb __P((u_char *b, int l)); */ /*static void ppplogchar __P((struct ppp_softc *, int)); */ /* * Some useful mbuf macros not in mbuf.h. */ #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) #define M_DATASTART(m) \ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) #define M_DATASIZE(m) \ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) /* * We steal two bits in the mbuf m_flags, to mark high-priority packets * for output, and received packets following lost/corrupted packets. */ #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ /* * Does c need to be escaped? */ #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F))) /* * Procedures for using an async tty interface for PPP. */ /* This is a FreeBSD-2.0 kernel. */ #define CCOUNT(rb) (((rb).Size+(rb).Head-(rb).Tail) % (rb).Size) #define FCOUNT(rb) ((rb).Size-CCOUNT(rb)-1) #define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */ #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */ /* * Define the PPP line discipline. */ static struct linesw pppdisc = { pppopen, pppclose, pppread, pppwrite, pppinput, pppstart, ppptioctl, NULL }; void pppasyncattach() { linesw[PPPDISC] = pppdisc; } TEXT_SET(pseudo_set, pppasyncattach); /* * Line specific open routine for async tty devices. * Attach the given tty to the first available ppp unit. * Called from device open routine or ttioctl. */ /* ARGSUSED */ int pppopen(struct rtems_termios_tty *tty) { int i; register struct ppp_softc *sc; struct mbuf *m = (struct mbuf *)0; extern int termios_baud_to_number(int); if (tty->t_line == PPPDISC) { sc = (struct ppp_softc *)tty->t_sc; if (sc != NULL && sc->sc_devp == (void *)tty) { return (0); } } if ((sc = pppalloc(1)) == NULL) { return ENXIO; } if (sc->sc_relinq) (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */ sc->sc_ilen = 0; sc->sc_m = NULL; bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); sc->sc_asyncmap[0] = 0xffffffff; sc->sc_asyncmap[3] = 0x60000000; sc->sc_rasyncmap = 0; sc->sc_devp = tty; sc->sc_start = pppasyncstart; sc->sc_ctlp = pppasyncctlp; sc->sc_relinq = pppasyncrelinq; sc->sc_outm = NULL; sc->sc_outmc = NULL; /* preallocate mbufs for free queue */ rtems_bsdnet_semaphore_obtain(); for (i=0; isc_m = m; } else { /* enqueue mbuf for later use */ IF_ENQUEUE(&sc->sc_freeq, m); } m = (struct mbuf *)0; } rtems_bsdnet_semaphore_release(); /* initialize values */ sc->sc_if.if_flags |= IFF_RUNNING; sc->sc_if.if_baudrate = termios_baud_to_number(tty->termios.c_cflag & CBAUD); tty->t_sc = (void *)sc; return ( RTEMS_SUCCESSFUL ); } /* * Line specific close routine, called from device close routine * and from ttioctl. * Detach the tty from the ppp unit. * Mimics part of ttyclose(). */ int pppclose(struct rtems_termios_tty *tty) { register struct ppp_softc *sc; tty->t_line = 0; sc = (struct ppp_softc *)tty->t_sc; if (sc != NULL) { tty->t_sc = NULL; if (tty == (struct rtems_termios_tty *)sc->sc_devp) { rtems_bsdnet_semaphore_obtain(); pppasyncrelinq(sc); pppdealloc(sc); rtems_bsdnet_semaphore_release(); } } return ( RTEMS_SUCCESSFUL ); } /* * Relinquish the interface unit to another device. */ static void pppasyncrelinq(sc) struct ppp_softc *sc; { #ifdef XXX_XXX if (sc->sc_outm) { m_freem(sc->sc_outm); sc->sc_outm = NULL; } if (sc->sc_m) { m_freem(sc->sc_m); sc->sc_m = NULL; } if (sc->sc_flags & SC_TIMEOUT) { untimeout(ppp_timeout, (void *) sc); sc->sc_flags &= ~SC_TIMEOUT; } #endif } /* * Line specific (tty) read routine. */ int pppread(struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args) { rtems_status_code status = RTEMS_UNSATISFIED; int count = 0; int maximum = rw_args->count; char *buffer = rw_args->buffer; register struct ppp_softc *sc = (struct ppp_softc *)tty->t_sc; struct mbuf *m; struct mbuf *m0; u_char *p; if (sc == NULL) { return 0; } /* * Loop waiting for input, checking that nothing disasterous * happens in the meantime. */ if (tty != (struct rtems_termios_tty *)sc->sc_devp || tty->t_line != PPPDISC) { return ( status ); } if (sc->sc_inq.ifq_head == NULL) { return ( status ); } /* Get the packet from the input queue */ rtems_bsdnet_semaphore_obtain(); IF_DEQUEUE(&sc->sc_inq, m0); /* loop over mbuf chain */ m = m0; while (( m != NULL ) && ( m->m_len > 0 ) && ( count+m->m_len < maximum )) { /* copy data into buffer */ p = mtod(m, u_char *); memcpy(buffer, p, m->m_len); memset(p, 0, m->m_len); count += m->m_len; buffer += m->m_len; /* increment loop index */ m = m->m_next; } /* free mbuf chain */ m_freem(m0); rtems_bsdnet_semaphore_release(); /* update return values */ rw_args->bytes_moved = count; if ( count >= 0 ) { status = RTEMS_SUCCESSFUL; } /* check to see if queue is empty */ if (sc->sc_inq.ifq_head != NULL) { /* queue is not empty - post another event to ourself */ rtems_event_send(sc->sc_pppdtask, PPPD_EVENT); } return ( status ); } /* * Line specific (tty) write routine. */ int pppwrite(struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args) { struct sockaddr dst; int n; int len; int maximum = rw_args->count; char *out_buffer = rw_args->buffer; register struct ppp_softc *sc = (struct ppp_softc *)tty->t_sc; struct mbuf *m; struct mbuf *m0; struct mbuf **mp; rtems_bsdnet_semaphore_obtain(); for (mp = &m0; maximum; mp = &m->m_next) { MGET(m, M_WAIT, MT_DATA); if ((*mp = m) == NULL) { m_freem(m0); return (ENOBUFS); } m->m_len = 0; if (maximum >= MCLBYTES / 2) { MCLGET(m, M_DONTWAIT); } len = M_TRAILINGSPACE(m); if (len > maximum) { memcpy(mtod(m, u_char *),out_buffer,maximum); m->m_len = maximum; maximum = 0; } else { memcpy(mtod(m, u_char *),out_buffer,len); m->m_len = len; maximum -= len; out_buffer += len; } } dst.sa_family = AF_UNSPEC; bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN); m0->m_data += PPP_HDRLEN; m0->m_len -= PPP_HDRLEN; n = pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0); rtems_bsdnet_semaphore_release(); return ( n ); } /* * Line specific (tty) ioctl routine. * This discipline requires that tty device drivers call * the line specific l_ioctl routine from their ioctl routines. */ /* ARGSUSED */ int ppptioctl(struct rtems_termios_tty *tty, rtems_libio_ioctl_args_t *args) { /* int i; */ int error = RTEMS_SUCCESSFUL; int cmd = args->command; caddr_t data = args->buffer; struct ppp_softc *sc = tty->t_sc; switch (cmd) { case RTEMS_IO_GET_ATTRIBUTES: case RTEMS_IO_SET_ATTRIBUTES: case RTEMS_IO_TCDRAIN: case RTEMS_IO_SNDWAKEUP: case RTEMS_IO_RCVWAKEUP: case TIOCGETD: case TIOCSETD: error = rtems_termios_ioctl(args); break; case PPPIOCSASYNCMAP: sc->sc_asyncmap[0] = *(u_int *)data; break; case PPPIOCGASYNCMAP: *(u_int *)data = sc->sc_asyncmap[0]; break; case PPPIOCSRASYNCMAP: sc->sc_rasyncmap = *(u_int *)data; break; case PPPIOCGRASYNCMAP: *(u_int *)data = sc->sc_rasyncmap; break; case PPPIOCSXASYNCMAP: bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */ sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */ sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */ break; case PPPIOCGXASYNCMAP: bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap)); break; default: rtems_bsdnet_semaphore_obtain(); error = pppioctl(sc, cmd, data, 0, NULL); rtems_bsdnet_semaphore_release(); } return error; } /* * FCS lookup table as calculated by genfcstab. */ static u_short fcstab[256] = { 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 }; /* * Calculate a new FCS given the current FCS and the new data. */ u_short pppfcs(u_short fcs, u_char *cp, int len) { while (len--) fcs = PPP_FCS(fcs, *cp++); return (fcs); } /* * This gets called at splsoftnet from if_ppp.c at various times * when there is data ready to be sent. */ void pppasyncstart(struct ppp_softc *sc) { /* check to see if output is not active */ if ( sc->sc_outflag == 0 ) { /* mark active and post tx event to daemon */ sc->sc_outflag |= SC_TX_PENDING; rtems_event_send(sc->sc_txtask, TX_PACKET); } } /* * This gets called when a received packet is placed on * the inq, at splsoftnet. */ static void pppasyncctlp(sc) struct ppp_softc *sc; { /* check to see if task id was set */ if ( sc->sc_pppdtask != 0 ) { /* post event to daemon */ rtems_event_send(sc->sc_pppdtask, PPPD_EVENT); } } /* * Start output on async tty interface. If the transmit queue * has drained sufficiently, arrange for pppasyncstart to be * called later at splsoftnet. * Called at spltty or higher. */ int pppstart(struct rtems_termios_tty *tp) { char c; char *sendBegin; char cFrame = (char )PPP_FLAG; u_char ioffset = (u_char )0; struct mbuf *m = (struct mbuf *)0; struct ppp_softc *sc = tp->t_sc; /* ensure input is valid and we are busy */ if (( sc != NULL ) && ( sc->sc_outflag & SC_TX_BUSY )) { /* check to see if we need to get the next buffer */ if ( sc->sc_outoff >= sc->sc_outlen ) { /* loop to get next non-zero length buffer */ if ( sc->sc_outmc != NULL ) { m = sc->sc_outmc->m_next; } /* check for next mbuf in chain */ if ( m != NULL ) { /* update values to use this mbuf */ sc->sc_outmc = m; sc->sc_outbuf = mtod(m, u_char *); sc->sc_outlen = m->m_len; sc->sc_outoff = (short)0; } else if ( (sc->sc_outflag & SC_TX_FCS) == 0 ) { /* setup to use FCS buffer */ sc->sc_outflag |= SC_TX_FCS; sc->sc_outbuf = sc->sc_outfcsbuf; sc->sc_outlen = sc->sc_outfcslen; sc->sc_outoff = (short)0; } else { /* done with this packet */ sc->sc_outflag &= ~SC_TX_BUSY; (*tp->device.write)(tp->minor, &cFrame, 1); rtems_event_send(sc->sc_txtask, TX_TRANSMIT); } } /* check to see if there is some data to write out */ if ( sc->sc_outoff < sc->sc_outlen ) { /* check to see if character needs to be escaped */ c = sc->sc_outbuf[sc->sc_outoff]; if ( ESCAPE_P(c) ) { if ( sc->sc_outflag & SC_TX_ESCAPE ) { /* last sent character was the escape character */ c = c ^ PPP_TRANS; /* clear the escape flag and increment the offset */ sc->sc_outflag &= ~SC_TX_ESCAPE; ioffset++; } else { /* need to send the escape character */ c = PPP_ESCAPE; /* set the escape flag */ sc->sc_outflag |= SC_TX_ESCAPE; } sendBegin = &c; } else { /* escape not needed - increment the offset as much as possible */ while ((!ESCAPE_P(c)) && ((sc->sc_outoff + ioffset) < sc->sc_outlen)) { ioffset++; c = sc->sc_outbuf[sc->sc_outoff + ioffset]; } sendBegin = &sc->sc_outbuf[sc->sc_outoff]; } /* write out the character(s) and update the stats */ (*tp->device.write)(tp->minor, sendBegin, (ioffset > 0) ? ioffset : 1); sc->sc_stats.ppp_obytes += (ioffset > 0) ? ioffset : 1; sc->sc_outoff += ioffset; } } return ( 0 ); } #ifdef XXX_XXX /* * Timeout routine - try to start some more output. */ static void ppp_timeout(x) void *x; { struct rtems_termios_tty *tty = (struct rtems_termios_tty *)x; struct ppp_softc *sc = tty->t_sc; /* struct rtems_termios_tty *tp = (struct rtems_termios_tty *)sc->sc_devp; */ sc->sc_flags &= ~SC_TIMEOUT; /* pppstart(tp); */ } #endif /* * Allocate enough mbuf to handle current MRU. */ #ifdef XXX_XXX static void pppgetm(sc) register struct ppp_softc *sc; { struct mbuf *m, **mp; int len; mp = &sc->sc_m; for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){ if ((m = *mp) == NULL) { MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) break; *mp = m; MCLGET(m, M_DONTWAIT); } len -= M_DATASIZE(m); mp = &m->m_next; } } #endif void pppallocmbuf(struct ppp_softc *sc, struct mbuf **mp) { int ilen; struct mbuf *m; /* loop over length value */ ilen = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; while ( ilen > 0 ) { /* see if this is end of the chain */ m = *mp; if ( m == NULL ) { /* get mbuf header */ MGETHDR(m, M_DONTWAIT, MT_DATA); if ( m == NULL ) { /* error - set condition to break out */ printf("pppallocmbuf: MGETHDR failed\n"); break; } MCLGET(m, M_DONTWAIT); m->m_next = NULL; *mp = m; } /* update loop variables */ mp = &m->m_next; ilen -= M_DATASIZE(m); } } /* * tty interface receiver interrupt. */ static unsigned paritytab[8] = { 0x96696996, 0x69969669, 0x69969669, 0x96696996, 0x69969669, 0x96696996, 0x96696996, 0x69969669 }; int pppinput(int c, struct rtems_termios_tty *tp) { register struct ppp_softc *sc = tp->t_sc; struct mbuf *m; int ilen; if (sc == NULL || tp != (struct rtems_termios_tty *)sc->sc_devp) return 0; if (sc->sc_m == NULL) { rtems_event_send(sc->sc_rxtask, RX_EMPTY); IF_DEQUEUE(&sc->sc_freeq, sc->sc_m); if ( sc->sc_m == NULL ) { return 0; } } ++sc->sc_stats.ppp_ibytes; c &= 0xff; if (c & 0x80) sc->sc_flags |= SC_RCV_B7_1; else sc->sc_flags |= SC_RCV_B7_0; if (paritytab[c >> 5] & (1 << (c & 0x1F))) sc->sc_flags |= SC_RCV_ODDP; else sc->sc_flags |= SC_RCV_EVNP; if (c == PPP_FLAG) { ilen = sc->sc_ilen; sc->sc_ilen = 0; /* * If SC_ESCAPED is set, then we've seen the packet * abort sequence "}~". */ if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED) || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) { sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */ if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){ /* bad fcs error */ sc->sc_if.if_ierrors++; sc->sc_stats.ppp_ierrors++; } else sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED); return 0; } if (ilen < PPP_HDRLEN + PPP_FCSLEN) { if (ilen) { /* too short error */ sc->sc_if.if_ierrors++; sc->sc_stats.ppp_ierrors++; sc->sc_flags |= SC_PKTLOST; } return 0; } /* Remove FCS trailer. Somewhat painful... */ ilen -= 2; if (--sc->sc_mc->m_len == 0) { for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next); sc->sc_mc = m; } sc->sc_mc->m_len--; /* excise this mbuf chain - place on raw queue */ m = sc->sc_m; if ( sc->sc_flags & SC_PKTLOST ) { m->m_flags |= M_ERRMARK; sc->sc_flags &= ~SC_PKTLOST; } IF_ENQUEUE(&sc->sc_rawq, m); /* setup next mbuf chain */ IF_DEQUEUE(&sc->sc_freeq, sc->sc_m); /* send rx packet event */ rtems_event_send(sc->sc_rxtask, RX_PACKET); return 0; } if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) return 0; if (sc->sc_flags & SC_ESCAPED) { sc->sc_flags &= ~SC_ESCAPED; c ^= PPP_TRANS; } else if (c == PPP_ESCAPE) { sc->sc_flags |= SC_ESCAPED; return 0; } /* * Initialize buffer on first octet received. * First octet could be address or protocol (when compressing * address/control). * Second octet is control. * Third octet is first or second (when compressing protocol) * octet of protocol. * Fourth octet is second octet of protocol. */ if (sc->sc_ilen == 0) { m = sc->sc_m; m->m_len = 0; m->m_data = M_DATASTART(sc->sc_m); sc->sc_mc = m; sc->sc_mp = mtod(m, char *); sc->sc_fcs = PPP_INITFCS; if (c != PPP_ALLSTATIONS) { if (sc->sc_flags & SC_REJ_COMP_AC) { /* garbage received error */ goto flush; } *sc->sc_mp++ = PPP_ALLSTATIONS; *sc->sc_mp++ = PPP_UI; sc->sc_ilen += 2; m->m_len += 2; } } if (sc->sc_ilen == 1 && c != PPP_UI) { /* missing UI error */ goto flush; } if (sc->sc_ilen == 2 && (c & 1) == 1) { /* a compressed protocol */ *sc->sc_mp++ = 0; sc->sc_ilen++; sc->sc_mc->m_len++; } if (sc->sc_ilen == 3 && (c & 1) == 0) { /* bad protocol error */ goto flush; } /* packet beyond configured mru? */ if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) { /* packet too big error */ goto flush; } /* is this mbuf full? */ m = sc->sc_mc; if (M_TRAILINGSPACE(m) <= 0) { if (m->m_next == NULL) { /* get next available mbuf for the chain */ IF_DEQUEUE(&sc->sc_freeq, m->m_next); if (m->m_next == NULL) { /* too few mbufs */ goto flush; } else { /* send rx mbuf event */ rtems_event_send(sc->sc_rxtask, RX_MBUF); } } sc->sc_mc = m = m->m_next; m->m_len = 0; m->m_next = 0; m->m_data = M_DATASTART(m); sc->sc_mp = mtod(m, char *); } ++m->m_len; *sc->sc_mp++ = c; sc->sc_fcs = PPP_FCS(sc->sc_fcs, c); return 0; flush: if (!(sc->sc_flags & SC_FLUSH)) { sc->sc_if.if_ierrors++; sc->sc_stats.ppp_ierrors++; sc->sc_flags |= SC_FLUSH; } return 0; } #ifdef XXX_XXX #define MAX_DUMP_BYTES 128 static void ppplogchar(sc, c) struct ppp_softc *sc; int c; { if (c >= 0) sc->sc_rawin[sc->sc_rawin_count++] = c; if (sc->sc_rawin_count >= sizeof(sc->sc_rawin) || (c < 0 && sc->sc_rawin_count > 0)) { printf("ppp%d input: ", sc->sc_if.if_unit); pppdumpb(sc->sc_rawin, sc->sc_rawin_count); sc->sc_rawin_count = 0; } } static void pppdumpb(b, l) u_char *b; int l; { char buf[3*MAX_DUMP_BYTES+4]; char *bp = buf; static char digits[] = "0123456789abcdef"; while (l--) { if (bp >= buf + sizeof(buf) - 3) { *bp++ = '>'; break; } *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */ *bp++ = digits[*b++ & 0xf]; *bp++ = ' '; } *bp = 0; printf("%s\n", buf); } #endif #endif /* NPPP > 0 */