diff options
Diffstat (limited to 'cpukit/libnetworking/net/ppp_tty.c')
| -rw-r--r-- | cpukit/libnetworking/net/ppp_tty.c | 938 |
1 files changed, 938 insertions, 0 deletions
diff --git a/cpukit/libnetworking/net/ppp_tty.c b/cpukit/libnetworking/net/ppp_tty.c new file mode 100644 index 0000000000..cab3278f30 --- /dev/null +++ b/cpukit/libnetworking/net/ppp_tty.c @@ -0,0 +1,938 @@ +/* + * 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 <sys/param.h> +#include <sys/systm.h> +#include <sys/proc.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <sys/file.h> +#include <sys/kernel.h> + +#include <net/if.h> +#include <net/if_types.h> + +#ifdef VJC +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <net/pppcompress.h> +#endif + +#include <rtems.h> +#include <rtems/libio.h> +#include <sys/ttycom.h> +#include <termios.h> +#include <rtems/termiostypes.h> + +#ifdef PPP_FILTER +#include <net/bpf.h> +#endif +#include <net/ppp_defs.h> +#include <net/if_ppp.h> +#include <net/if_pppvar.h> + + +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; + + 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; i<NUM_MBUFQ; i++) { + pppallocmbuf(sc, &m); + if ( i == 0 ) { + /* use first mbuf for rx iterrupt handling */ + sc->sc_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 = 57600; /* FIX: get line speed from termios */ + + 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 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; + } + } + else { + /* escape not needed - increment the offset */ + ioffset++; + } + + /* write out the character and update the stats */ + (*tp->device.write)(tp->minor, &c, 1); + sc->sc_stats.ppp_obytes++; + 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 */ |