/*
* 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;
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; 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 =
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 */
