/
ppp_tty.c
1310 lines (1173 loc) · 32.8 KB
/
ppp_tty.c
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/* $NetBSD: ppp_tty.c,v 1.47.22.2 2007/12/08 18:21:07 mjf Exp $ */
/* Id: ppp_tty.c,v 1.3 1996/07/01 01:04:11 paulus Exp */
/*
* ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
* tty devices.
*
* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* 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).
*/
/* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ppp_tty.c,v 1.47.22.2 2007/12/08 18:21:07 mjf Exp $");
#include "ppp.h"
#include "opt_ppp.h"
#define VJC
#define PPP_COMPRESS
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/dkstat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/tty.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/systm.h>
#include <sys/kauth.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/slcompress.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0 || defined(PPP_FILTER)
#include <net/bpf.h>
#endif
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#include <net/if_pppvar.h>
static int pppopen(dev_t dev, struct tty *tp);
static int pppclose(struct tty *tp, int flag);
static int pppread(struct tty *tp, struct uio *uio, int flag);
static int pppwrite(struct tty *tp, struct uio *uio, int flag);
static int ppptioctl(struct tty *tp, u_long cmd, void *data, int flag,
struct lwp *);
static int pppinput(int c, struct tty *tp);
static int pppstart(struct tty *tp);
struct linesw ppp_disc = { /* XXX should be static */
.l_name = "ppp",
.l_open = pppopen,
.l_close = pppclose,
.l_read = pppread,
.l_write = pppwrite,
.l_ioctl = ppptioctl,
.l_rint = pppinput,
.l_start = pppstart,
.l_modem = ttymodem,
.l_poll = ttpoll
};
static void ppprcvframe(struct ppp_softc *sc, struct mbuf *m);
static u_int16_t pppfcs(u_int16_t fcs, u_char *cp, int len);
static void pppsyncstart(struct ppp_softc *sc);
static void pppasyncstart(struct ppp_softc *);
static void pppasyncctlp(struct ppp_softc *);
static void pppasyncrelinq(struct ppp_softc *);
static void ppp_timeout(void *);
static void pppgetm(struct ppp_softc *sc);
static void pppdumpb(u_char *b, int l);
static void ppplogchar(struct ppp_softc *, int);
static void pppdumpframe(struct ppp_softc *sc, struct mbuf* m, int xmit);
/*
* 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)
/*
* 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 NetBSD-1.0 or later kernel. */
#define CCOUNT(q) ((q)->c_cc)
#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 */
/*
* 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 */
static int
pppopen(dev_t dev, struct tty *tp)
{
struct lwp *l = curlwp; /* XXX */
struct ppp_softc *sc;
int error, s;
if ((error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
NULL)) != 0)
return (error);
s = spltty();
if (tp->t_linesw == &ppp_disc) {
sc = (struct ppp_softc *) tp->t_sc;
if (sc != NULL && sc->sc_devp == (void *) tp) {
splx(s);
return (0);
}
}
if ((sc = pppalloc(l->l_proc->p_pid)) == NULL) {
splx(s);
return ENXIO;
}
if (sc->sc_relinq)
(*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
#if NBPFILTER > 0
/* Switch DLT to PPP-over-serial. */
bpf_change_type(&sc->sc_if, DLT_PPP_SERIAL, PPP_HDRLEN);
#endif
sc->sc_ilen = 0;
sc->sc_m = NULL;
memset(sc->sc_asyncmap, 0, sizeof(sc->sc_asyncmap));
sc->sc_asyncmap[0] = 0xffffffff;
sc->sc_asyncmap[3] = 0x60000000;
sc->sc_rasyncmap = 0;
sc->sc_devp = (void *) tp;
sc->sc_start = pppasyncstart;
sc->sc_ctlp = pppasyncctlp;
sc->sc_relinq = pppasyncrelinq;
sc->sc_outm = NULL;
pppgetm(sc);
sc->sc_if.if_flags |= IFF_RUNNING;
sc->sc_if.if_baudrate = tp->t_ospeed;
tp->t_sc = (void *) sc;
mutex_spin_enter(&tty_lock);
ttyflush(tp, FREAD | FWRITE);
mutex_spin_exit(&tty_lock);
splx(s);
return (0);
}
/*
* Line specific close routine, called from device close routine
* and from ttioctl.
* Detach the tty from the ppp unit.
* Mimics part of ttyclose().
*/
static int
pppclose(struct tty *tp, int flag)
{
struct ppp_softc *sc;
int s;
s = spltty();
mutex_spin_enter(&tty_lock);
ttyflush(tp, FREAD|FWRITE);
mutex_spin_exit(&tty_lock); /* XXX */
ttyldisc_release(tp->t_linesw);
tp->t_linesw = ttyldisc_default();
sc = (struct ppp_softc *) tp->t_sc;
if (sc != NULL) {
tp->t_sc = NULL;
if (tp == (struct tty *) sc->sc_devp) {
pppasyncrelinq(sc);
pppdealloc(sc);
}
}
splx(s);
return 0;
}
/*
* Relinquish the interface unit to another device.
*/
static void
pppasyncrelinq(struct ppp_softc *sc)
{
int s;
#if NBPFILTER > 0
/* Change DLT to back none. */
bpf_change_type(&sc->sc_if, DLT_NULL, 0);
#endif
s = spltty();
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) {
callout_stop(&sc->sc_timo_ch);
sc->sc_flags &= ~SC_TIMEOUT;
}
splx(s);
}
/*
* Line specific (tty) read routine.
*/
static int
pppread(struct tty *tp, struct uio *uio, int flag)
{
struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
struct mbuf *m, *m0;
int error = 0;
if (sc == NULL)
return 0;
/*
* Loop waiting for input, checking that nothing disasterous
* happens in the meantime.
*/
mutex_spin_enter(&tty_lock);
for (;;) {
if (tp != (struct tty *) sc->sc_devp ||
tp->t_linesw != &ppp_disc) {
mutex_spin_exit(&tty_lock);
return 0;
}
if (sc->sc_inq.ifq_head != NULL)
break;
if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0
&& (tp->t_state & TS_ISOPEN)) {
mutex_spin_exit(&tty_lock);
return 0; /* end of file */
}
if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
mutex_spin_exit(&tty_lock);
return (EWOULDBLOCK);
}
error = ttysleep(tp, &tp->t_rawq.c_cv, true, 0);
if (error) {
mutex_spin_exit(&tty_lock);
return error;
}
}
/* Pull place-holder byte out of canonical queue */
getc(&tp->t_canq);
/* Get the packet from the input queue */
IF_DEQUEUE(&sc->sc_inq, m0);
mutex_spin_exit(&tty_lock);
for (m = m0; m && uio->uio_resid; m = m->m_next)
if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0)
break;
m_freem(m0);
return (error);
}
/*
* Line specific (tty) write routine.
*/
static int
pppwrite(struct tty *tp, struct uio *uio, int flag)
{
struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
struct mbuf *m, *m0;
struct sockaddr dst;
int len, error;
if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
return 0; /* wrote 0 bytes */
if (tp->t_linesw != &ppp_disc)
return (EINVAL);
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return EIO;
if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
uio->uio_resid < PPP_HDRLEN)
return (EMSGSIZE);
MGETHDR(m0, M_WAIT, MT_DATA);
if (m0 == NULL)
return ENOBUFS;
m0->m_len = 0;
m0->m_pkthdr.len = uio->uio_resid;
m0->m_pkthdr.rcvif = NULL;
if (uio->uio_resid >= MCLBYTES / 2)
MCLGET(m0, M_DONTWAIT);
for (m = m0; uio->uio_resid;) {
len = M_TRAILINGSPACE(m);
if (len > uio->uio_resid)
len = uio->uio_resid;
if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) {
m_freem(m0);
return (error);
}
m->m_len = len;
if (uio->uio_resid == 0)
break;
MGET(m->m_next, M_WAIT, MT_DATA);
if (m->m_next == NULL) {
m_freem(m0);
return ENOBUFS;
}
m = m->m_next;
m->m_len = 0;
}
dst.sa_family = AF_UNSPEC;
bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
m_adj(m0, PPP_HDRLEN);
return ((*sc->sc_if.if_output)(&sc->sc_if, m0, &dst, (struct rtentry *)0));
}
/*
* Line specific (tty) ioctl routine.
* This discipline requires that tty device drivers call
* the line specific l_ioctl routine from their ioctl routines.
*/
/* ARGSUSED */
static int
ppptioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l)
{
struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
int error, s;
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return (EPASSTHROUGH);
error = 0;
switch (cmd) {
case TIOCRCVFRAME:
ppprcvframe(sc,*((struct mbuf **)data));
break;
case PPPIOCSASYNCMAP:
if ((error = kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) != 0)
break;
sc->sc_asyncmap[0] = *(u_int *)data;
break;
case PPPIOCGASYNCMAP:
*(u_int *)data = sc->sc_asyncmap[0];
break;
case PPPIOCSRASYNCMAP:
if ((error = kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) != 0)
break;
sc->sc_rasyncmap = *(u_int *)data;
break;
case PPPIOCGRASYNCMAP:
*(u_int *)data = sc->sc_rasyncmap;
break;
case PPPIOCSXASYNCMAP:
if ((error = kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) != 0)
break;
s = spltty();
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 */
splx(s);
break;
case PPPIOCGXASYNCMAP:
bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
break;
default:
error = pppioctl(sc, cmd, data, flag, l);
if (error == 0 && cmd == PPPIOCSMRU)
pppgetm(sc);
}
return error;
}
/* receive a complete ppp frame from device in synchronous
* hdlc mode. caller gives up ownership of mbuf
*/
static void
ppprcvframe(struct ppp_softc *sc, struct mbuf *m)
{
int len, s;
struct mbuf *n;
u_char hdr[4];
int hlen,count;
for (n=m,len=0;n != NULL;n = n->m_next)
len += n->m_len;
if (len==0) {
m_freem(m);
return;
}
/* extract PPP header from mbuf chain (1 to 4 bytes) */
for (n=m,hlen=0;n!=NULL && hlen<sizeof(hdr);n=n->m_next) {
count = (sizeof(hdr)-hlen) < n->m_len ?
sizeof(hdr)-hlen : n->m_len;
bcopy(mtod(n,u_char*),&hdr[hlen],count);
hlen+=count;
}
s = spltty();
/* if AFCF compressed then prepend AFCF */
if (hdr[0] != PPP_ALLSTATIONS) {
if (sc->sc_flags & SC_REJ_COMP_AC) {
if (sc->sc_flags & SC_DEBUG)
printf(
"%s: garbage received: 0x%x (need 0xFF)\n",
sc->sc_if.if_xname, hdr[0]);
goto bail;
}
M_PREPEND(m,2,M_DONTWAIT);
if (m==NULL) {
splx(s);
return;
}
hdr[3] = hdr[1];
hdr[2] = hdr[0];
hdr[0] = PPP_ALLSTATIONS;
hdr[1] = PPP_UI;
len += 2;
}
/* if protocol field compressed, add MSB of protocol field = 0 */
if (hdr[2] & 1) {
/* a compressed protocol */
M_PREPEND(m,1,M_DONTWAIT);
if (m==NULL) {
splx(s);
return;
}
hdr[3] = hdr[2];
hdr[2] = 0;
len++;
}
/* valid LSB of protocol field has bit0 set */
if (!(hdr[3] & 1)) {
if (sc->sc_flags & SC_DEBUG)
printf("%s: bad protocol %x\n", sc->sc_if.if_xname,
(hdr[2] << 8) + hdr[3]);
goto bail;
}
/* packet beyond configured mru? */
if (len > sc->sc_mru + PPP_HDRLEN) {
if (sc->sc_flags & SC_DEBUG)
printf("%s: packet too big\n", sc->sc_if.if_xname);
goto bail;
}
/* add expanded 4 byte header to mbuf chain */
for (n=m,hlen=0;n!=NULL && hlen<sizeof(hdr);n=n->m_next) {
count = (sizeof(hdr)-hlen) < n->m_len ?
sizeof(hdr)-hlen : n->m_len;
bcopy(&hdr[hlen],mtod(n,u_char*),count);
hlen+=count;
}
/* if_ppp.c requires the PPP header and IP header */
/* to be contiguous */
count = len < MHLEN ? len : MHLEN;
if (m->m_len < count) {
m = m_pullup(m,count);
if (m==NULL)
goto bail;
}
sc->sc_stats.ppp_ibytes += len;
if (sc->sc_flags & SC_LOG_RAWIN)
pppdumpframe(sc,m,0);
ppppktin(sc, m, 0);
splx(s);
return;
bail:
m_freem(m);
splx(s);
}
/*
* FCS lookup table as calculated by genfcstab.
*/
static const u_int16_t 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.
*/
static u_int16_t
pppfcs(u_int16_t fcs, u_char *cp, int len)
{
while (len--)
fcs = PPP_FCS(fcs, *cp++);
return (fcs);
}
/* This gets called at splsoftnet from pppasyncstart at various times
* when there is data ready to be sent.
*/
static void
pppsyncstart(struct ppp_softc *sc)
{
struct tty *tp = (struct tty *) sc->sc_devp;
struct mbuf *m, *n;
const struct cdevsw *cdev;
int len;
for(m = sc->sc_outm;;) {
if (m == NULL) {
m = ppp_dequeue(sc); /* get new packet */
if (m == NULL)
break; /* no more packets */
if (sc->sc_flags & SC_DEBUG)
pppdumpframe(sc,m,1);
}
for(n=m,len=0;n!=NULL;n=n->m_next)
len += n->m_len;
/* call device driver IOCTL to transmit a frame */
cdev = cdevsw_lookup(tp->t_dev);
if (cdev == NULL ||
(*cdev->d_ioctl)(tp->t_dev, TIOCXMTFRAME, (void *)&m,
0, 0)) {
/* busy or error, set as current packet */
sc->sc_outm = m;
break;
}
sc->sc_outm = m = NULL;
sc->sc_stats.ppp_obytes += len;
}
}
/*
* This gets called at splsoftnet from if_ppp.c at various times
* when there is data ready to be sent.
*/
static void
pppasyncstart(struct ppp_softc *sc)
{
struct tty *tp = (struct tty *) sc->sc_devp;
struct mbuf *m;
int len;
u_char *start, *stop, *cp;
int n, ndone, done, idle;
struct mbuf *m2;
if (sc->sc_flags & SC_SYNC){
pppsyncstart(sc);
return;
}
mutex_spin_enter(&tty_lock);
idle = 0;
while (CCOUNT(&tp->t_outq) < PPP_HIWAT) {
/*
* See if we have an existing packet partly sent.
* If not, get a new packet and start sending it.
*/
m = sc->sc_outm;
if (m == NULL) {
/*
* Get another packet to be sent.
*/
m = ppp_dequeue(sc);
if (m == NULL) {
idle = 1;
break;
}
/*
* The extra PPP_FLAG will start up a new packet, and thus
* will flush any accumulated garbage. We do this whenever
* the line may have been idle for some time.
*/
if (CCOUNT(&tp->t_outq) == 0) {
++sc->sc_stats.ppp_obytes;
(void) putc(PPP_FLAG, &tp->t_outq);
}
/* Calculate the FCS for the first mbuf's worth. */
sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
}
for (;;) {
start = mtod(m, u_char *);
len = m->m_len;
stop = start + len;
while (len > 0) {
/*
* Find out how many bytes in the string we can
* handle without doing something special.
*/
for (cp = start; cp < stop; cp++)
if (ESCAPE_P(*cp))
break;
n = cp - start;
if (n) {
/* NetBSD (0.9 or later), 4.3-Reno or similar. */
ndone = n - b_to_q(start, n, &tp->t_outq);
len -= ndone;
start += ndone;
sc->sc_stats.ppp_obytes += ndone;
if (ndone < n)
break; /* packet doesn't fit */
}
/*
* If there are characters left in the mbuf,
* the first one must be special.
* Put it out in a different form.
*/
if (len) {
if (putc(PPP_ESCAPE, &tp->t_outq))
break;
if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
(void) unputc(&tp->t_outq);
break;
}
sc->sc_stats.ppp_obytes += 2;
start++;
len--;
}
}
/*
* If we didn't empty this mbuf, remember where we're up to.
* If we emptied the last mbuf, try to add the FCS and closing
* flag, and if we can't, leave sc_outm pointing to m, but with
* m->m_len == 0, to remind us to output the FCS and flag later.
*/
done = len == 0;
if (done && m->m_next == NULL) {
u_char *p, *q;
int c;
u_char endseq[8];
/*
* We may have to escape the bytes in the FCS.
*/
p = endseq;
c = ~sc->sc_outfcs & 0xFF;
if (ESCAPE_P(c)) {
*p++ = PPP_ESCAPE;
*p++ = c ^ PPP_TRANS;
} else
*p++ = c;
c = (~sc->sc_outfcs >> 8) & 0xFF;
if (ESCAPE_P(c)) {
*p++ = PPP_ESCAPE;
*p++ = c ^ PPP_TRANS;
} else
*p++ = c;
*p++ = PPP_FLAG;
/*
* Try to output the FCS and flag. If the bytes
* don't all fit, back out.
*/
for (q = endseq; q < p; ++q)
if (putc(*q, &tp->t_outq)) {
done = 0;
for (; q > endseq; --q)
unputc(&tp->t_outq);
break;
}
if (done)
sc->sc_stats.ppp_obytes += q - endseq;
}
if (!done) {
/* remember where we got to */
m->m_data = start;
m->m_len = len;
break;
}
/* Finished with this mbuf; free it and move on. */
MFREE(m, m2);
m = m2;
if (m == NULL) {
/* Finished a packet */
break;
}
sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
}
/*
* If m == NULL, we have finished a packet.
* If m != NULL, we've either done as much work this time
* as we need to, or else we've filled up the output queue.
*/
sc->sc_outm = m;
if (m)
break;
}
/* Call pppstart to start output again if necessary. */
pppstart(tp);
/*
* This timeout is needed for operation on a pseudo-tty,
* because the pty code doesn't call pppstart after it has
* drained the t_outq.
*/
if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
callout_reset(&sc->sc_timo_ch, 1, ppp_timeout, sc);
sc->sc_flags |= SC_TIMEOUT;
}
mutex_spin_exit(&tty_lock);
}
/*
* This gets called when a received packet is placed on
* the inq, at splsoftnet.
*/
static void
pppasyncctlp(struct ppp_softc *sc)
{
struct tty *tp;
/* Put a placeholder byte in canq for ttselect()/ttnread(). */
mutex_spin_enter(&tty_lock);
tp = (struct tty *) sc->sc_devp;
putc(0, &tp->t_canq);
ttwakeup(tp);
mutex_spin_exit(&tty_lock);
}
/*
* 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.
*/
static int
pppstart(struct tty *tp)
{
struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
/*
* If there is stuff in the output queue, send it now.
* We are being called in lieu of ttstart and must do what it would.
*/
if (tp->t_oproc != NULL)
(*tp->t_oproc)(tp);
/*
* If the transmit queue has drained and the tty has not hung up
* or been disconnected from the ppp unit, then tell if_ppp.c that
* we need more output.
*/
if ((CCOUNT(&tp->t_outq) >= PPP_LOWAT)
&& ((sc == NULL) || (sc->sc_flags & SC_TIMEOUT)))
return 0;
#ifdef ALTQ
/*
* if ALTQ is enabled, don't invoke NETISR_PPP.
* pppintr() could loop without doing anything useful
* under rate-limiting.
*/
if (ALTQ_IS_ENABLED(&sc->sc_if.if_snd))
return 0;
#endif
if (!((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
&& sc != NULL && tp == (struct tty *) sc->sc_devp) {
ppp_restart(sc);
}
return 0;
}
/*
* Timeout routine - try to start some more output.
*/
static void
ppp_timeout(void *x)
{
struct ppp_softc *sc = (struct ppp_softc *) x;
struct tty *tp = (struct tty *) sc->sc_devp;
mutex_spin_enter(&tty_lock);
sc->sc_flags &= ~SC_TIMEOUT;
pppstart(tp);
mutex_spin_exit(&tty_lock);
}
/*
* Allocate enough mbuf to handle current MRU.
*/
static void
pppgetm(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;
}
}
/*
* tty interface receiver interrupt.
*/
static const unsigned paritytab[8] = {
0x96696996, 0x69969669, 0x69969669, 0x96696996,
0x69969669, 0x96696996, 0x96696996, 0x69969669
};
static int
pppinput(int c, struct tty *tp)
{
struct ppp_softc *sc;
struct mbuf *m;
const struct cdevsw *cdev;
int ilen, s;
sc = (struct ppp_softc *) tp->t_sc;
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return 0;
++tk_nin;
++sc->sc_stats.ppp_ibytes;
if (c & TTY_FE) {
/* framing error or overrun on this char - abort packet */
if (sc->sc_flags & SC_DEBUG)
printf("%s: bad char %x\n", sc->sc_if.if_xname, c);