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freebsd-dev/sys/net/if_ppp.c
Bruce Evans 0d0e55bbbd Obtained from: an ancient patch of mine via 1.1.5 
Call output process whether or not there is any output.  The output
process may be overloaded to handle hardware flow control and
hardware output completions.
1995-07-31 21:54:46 +00:00

1641 lines
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/*
* if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
*
* 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: if_ppp.c,v 1.18 1995/07/31 21:01:34 bde Exp $ */
/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
#include "ppp.h"
#if NPPP > 0
#define VJC
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/buf.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/kernel.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#if INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <sys/time.h>
#include <net/bpf.h>
#endif
#ifdef VJC
#include <net/pppcompress.h>
#define HDROFF MAX_HDR
/* HDROFF should really be 128, but other parts of the system will
panic on TCP+IP headers bigger than MAX_HDR = MHLEN (100). */
#else
#define HDROFF (0)
#endif
#include <net/if_ppp.h>
#include <machine/cpu.h>
/* This is a FreeBSD-2.x kernel. */
#define CCOUNT(q) ((q)->c_cc)
#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
#define PPP_MAXMTU 16384 /* Largest MTU we allow */
struct ppp_softc ppp_softc[NPPP];
void pppattach __P((void));
int pppopen __P((dev_t dev, struct tty *tp));
int pppclose __P((struct tty *tp, int flag));
int pppread __P((struct tty *tp, struct uio *uio, int flag));
int pppwrite __P((struct tty *tp, struct uio *uio, int flag));
int ppptioctl __P((struct tty *tp, int cmd, caddr_t data, int flag,
struct proc *));
int pppoutput __P((struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *));
int pppinput __P((int c, struct tty *tp));
int pppioctl __P((struct ifnet *ifp, int cmd, caddr_t data));
int pppstart __P((struct tty *tp));
static struct linesw pppdisc = {
pppopen, pppclose, pppread, pppwrite, ppptioctl,
pppinput, pppstart, ttymodem
};
static int pppasyncstart __P((struct ppp_softc *));
static u_short pppfcs __P((u_short fcs, u_char *cp, int len));
static int pppgetm __P((struct ppp_softc *sc));
static struct mbuf *ppp_btom __P((struct ppp_softc *sc));
static void pppdumpm __P((struct mbuf *m0, int pktlen));
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_DATASTART(m) \
((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf : \
(m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
#define M_DATASIZE(m) \
((m)->m_flags & M_EXT ? (m)->m_ext.ext_size : \
(m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
/*
* The following disgusting hack gets around the problem that IP TOS
* can't be set yet. We want to put "interactive" traffic on a high
* priority queue. To decide if traffic is interactive, we check that
* a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
*/
static u_short interactive_ports[8] = {
0, 513, 0, 0,
0, 21, 0, 23,
};
#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
/*
* Does c need to be escaped?
*/
#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
/*
* Called from boot code to establish ppp interfaces.
*/
void
pppattach()
{
register struct ppp_softc *sc;
register int i = 0;
linesw[PPPDISC] = pppdisc;
for (sc = ppp_softc; i < NPPP; sc++) {
sc->sc_if.if_name = "ppp";
sc->sc_if.if_unit = i++;
sc->sc_if.if_mtu = PPP_MTU;
sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
sc->sc_if.if_type = IFT_PPP;
sc->sc_if.if_hdrlen = PPP_HDRLEN;
sc->sc_if.if_ioctl = pppioctl;
sc->sc_if.if_output = pppoutput;
sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
if_attach(&sc->sc_if);
#if NBPFILTER > 0
bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
#endif
}
}
/*
* Allocate a ppp interface unit and initialize it.
*/
struct ppp_softc *
pppalloc(pid)
pid_t pid;
{
int nppp;
struct ppp_softc *sc;
for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
if (sc->sc_xfer == pid) {
sc->sc_xfer = 0;
break;
}
if (nppp >= NPPP)
for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
if (sc->sc_devp == NULL)
break;
if (nppp >= NPPP)
return NULL;
sc->sc_flags = 0;
sc->sc_mru = PPP_MRU;
#ifdef VJC
sl_compress_init(&sc->sc_comp);
#endif
sc->sc_if.if_flags |= IFF_RUNNING;
return sc;
}
/*
* Deallocate a ppp unit.
*/
void
pppdealloc(sc)
struct ppp_softc *sc;
{
struct mbuf *m;
if_down(&sc->sc_if);
sc->sc_devp = NULL;
sc->sc_xfer = 0;
for (;;) {
IF_DEQUEUE(&sc->sc_inq, m);
if (m == NULL)
break;
m_freem(m);
}
for (;;) {
IF_DEQUEUE(&sc->sc_fastq, m);
if (m == NULL)
break;
m_freem(m);
}
sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
}
/*
* Line specific open routine for async tty devices.
* Attach the given tty to the first available ppp unit.
*/
/* ARGSUSED */
int
pppopen(dev, tp)
dev_t dev;
register struct tty *tp;
{
struct proc *p = curproc; /* XXX */
register struct ppp_softc *sc;
int error, s, i;
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
if (tp->t_line == PPPDISC) {
sc = (struct ppp_softc *) tp->t_sc;
if (sc != NULL && sc->sc_devp == (void *) tp)
return (0);
}
if ((sc = pppalloc(p->p_pid)) == NULL)
return ENXIO;
if (sc->sc_outm != NULL) {
m_freem(sc->sc_outm);
sc->sc_outm = NULL;
}
if (pppgetm(sc) == 0) {
sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
return (ENOBUFS);
}
sc->sc_ilen = 0;
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 = (void *) tp;
sc->sc_start = pppasyncstart;
tp->t_sc = (caddr_t) sc;
ttyflush(tp, FREAD | FWRITE);
/*
* XXX we fudge t_canq to avoid providing pppselect() and FIONREAD.
* I hope one char is enough. The following actually gives CBSIZE
* chars.
*/
clist_alloc_cblocks(&tp->t_canq, 1, 1);
clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
sc->sc_if.if_mtu + PPP_HIWAT);
clist_alloc_cblocks(&tp->t_rawq, 0, 0);
return (0);
}
/*
* Line specific close routine.
* Detach the tty from the ppp unit.
* Mimics part of ttyclose().
*/
int
pppclose(tp, flag)
struct tty *tp;
int flag;
{
register struct ppp_softc *sc;
struct mbuf *m;
int s;
if (ttywflush(tp))
ttyflush(tp, FREAD | FWRITE);
s = splimp(); /* paranoid; splnet probably ok */
clist_free_cblocks(&tp->t_outq);
tp->t_line = 0;
sc = (struct ppp_softc *)tp->t_sc;
if (sc != NULL) {
tp->t_sc = NULL;
if (tp == (struct tty *) sc->sc_devp) {
m_freem(sc->sc_outm);
sc->sc_outm = NULL;
m_freem(sc->sc_m);
sc->sc_m = NULL;
pppdealloc(sc);
}
}
splx(s);
return (0); /* success */
}
/*
* Line specific (tty) read routine.
*/
int
pppread(tp, uio, flag)
register struct tty *tp;
struct uio *uio;
int flag;
{
register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
struct mbuf *m, *m0;
register int s;
int error = 0;
if ((tp->t_state & TS_CONNECTED) == 0)
return 0; /* end of file */
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return 0;
s = splimp();
while (sc->sc_inq.ifq_head == NULL && tp->t_line == PPPDISC) {
if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
}
error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, "pppin", 0);
if (error)
return error;
}
if (tp->t_line != PPPDISC) {
splx(s);
return (-1);
}
/* 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);
splx(s);
for (m = m0; m && uio->uio_resid; m = m->m_next)
if (error = uiomove(mtod(m, u_char *), m->m_len, uio))
break;
m_freem(m0);
return (error);
}
/*
* Line specific (tty) write routine.
*/
int
pppwrite(tp, uio, flag)
register struct tty *tp;
struct uio *uio;
int flag;
{
register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
struct mbuf *m, *m0, **mp;
struct sockaddr dst;
struct ppp_header *ph1, *ph2;
int len, error;
if ((tp->t_state & TS_CONNECTED) == 0)
return 0; /* wrote 0 bytes */
if (tp->t_line != PPPDISC)
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);
for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
MGET(m, M_WAIT, MT_DATA);
if ((*mp = m) == NULL) {
m_freem(m0);
return (ENOBUFS);
}
m->m_len=0;
if (uio->uio_resid >= MCLBYTES / 2)
MCLGET(m, M_DONTWAIT);
len = M_TRAILINGSPACE(m);
if (len > uio->uio_resid)
len = uio->uio_resid;
if (error = uiomove(mtod(m, u_char *), len, uio)) {
m_freem(m0);
return (error);
}
m->m_len = len;
}
dst.sa_family = AF_UNSPEC;
ph1 = (struct ppp_header *) &dst.sa_data;
ph2 = mtod(m0, struct ppp_header *);
*ph1 = *ph2;
m0->m_data += PPP_HDRLEN;
m0->m_len -= PPP_HDRLEN;
return (pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0));
}
/*
* Line specific (tty) ioctl routine.
* Provide a way to get the ppp unit number.
* This discipline requires that tty device drivers call
* the line specific l_ioctl routine from their ioctl routines.
*/
/* ARGSUSED */
int
ppptioctl(tp, cmd, data, flag, p)
struct tty *tp;
caddr_t data;
int cmd, flag;
struct proc *p;
{
register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
int s, error, flags, mru;
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return -1;
switch (cmd) {
case FIONREAD:
*(int *)data = sc->sc_inq.ifq_len;
break;
case PPPIOCGUNIT:
*(int *)data = sc->sc_if.if_unit;
break;
case PPPIOCGFLAGS:
*(u_int *)data = sc->sc_flags;
break;
case PPPIOCSFLAGS:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
flags = *(int *)data & SC_MASK;
s = splimp();
sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
splx(s);
break;
case PPPIOCSASYNCMAP:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
sc->sc_asyncmap[0] = *(u_int *)data;
break;
case PPPIOCGASYNCMAP:
*(u_int *)data = sc->sc_asyncmap[0];
break;
case PPPIOCSRASYNCMAP:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
sc->sc_rasyncmap = *(u_int *)data;
break;
case PPPIOCGRASYNCMAP:
*(u_int *)data = sc->sc_rasyncmap;
break;
case PPPIOCSXASYNCMAP:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
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;
case PPPIOCSMRU:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
mru = *(int *)data;
if (mru >= PPP_MRU && mru <= PPP_MAXMRU) {
sc->sc_mru = mru;
if (pppgetm(sc) == 0) {
error = ENOBUFS;
sc->sc_mru = PPP_MRU;
if (pppgetm(sc) == 0)
sc->sc_if.if_flags &= ~IFF_UP;
}
}
break;
case PPPIOCGMRU:
*(int *)data = sc->sc_mru;
break;
#ifdef VJC
case PPPIOCSMAXCID:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
sl_compress_setup(&sc->sc_comp, *(int *)data);
break;
#endif
case PPPIOCXFERUNIT:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
sc->sc_xfer = p->p_pid;
break;
default:
return (-1);
}
return (0);
}
/*
* 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.
*/
static u_short
pppfcs(fcs, cp, len)
register u_short fcs;
register u_char *cp;
register int len;
{
while (len--)
fcs = PPP_FCS(fcs, *cp++);
return (fcs);
}
/*
* Queue a packet. Start transmission if not active.
* Packet is placed in Information field of PPP frame.
*/
int
pppoutput(ifp, m0, dst, rt)
struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt;
{
register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
struct ppp_header *ph;
int protocol, address, control;
u_char *cp;
int s, error;
struct ip *ip;
struct ifqueue *ifq;
if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
|| (ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC) {
error = ENETDOWN; /* sort of */
goto bad;
}
/*
* Compute PPP header.
*/
address = PPP_ALLSTATIONS;
control = PPP_UI;
ifq = &ifp->if_snd;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
protocol = PPP_IP;
if ((sc->sc_flags & SC_ENABLE_IP) == 0) {
error = ENETDOWN;
goto bad;
}
/*
* If this is a TCP packet to or from an "interactive" port,
* put the packet on the fastq instead.
*/
if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) {
register int p = ntohl(((int *)ip)[ip->ip_hl]);
if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16))
ifq = &sc->sc_fastq;
}
/*
* Most high-priority services set IPTOS_LOWDELAY. This is a much more
* generic mechanism than specific port numbers. This same mechanism
* is used by slip.
*/
if (ip->ip_tos & IPTOS_LOWDELAY)
ifq = &sc->sc_fastq;
break;
#endif
#ifdef NS
case AF_NS:
protocol = PPP_XNS;
break;
#endif
case AF_UNSPEC:
ph = (struct ppp_header *) dst->sa_data;
address = ph->ph_address;
control = ph->ph_control;
protocol = ntohs(ph->ph_protocol);
break;
default:
printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
error = EAFNOSUPPORT;
goto bad;
}
/*
* Add PPP header. If no space in first mbuf, allocate another.
* (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
*/
if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT);
if (m0 == 0) {
error = ENOBUFS;
goto bad;
}
m0->m_len = 0;
} else
m0->m_data -= PPP_HDRLEN;
cp = mtod(m0, u_char *);
*cp++ = address;
*cp++ = control;
*cp++ = protocol >> 8;
*cp++ = protocol & 0xff;
m0->m_len += PPP_HDRLEN;
if (sc->sc_flags & SC_LOG_OUTPKT) {
printf("ppp%d output: ", ifp->if_unit);
pppdumpm(m0, -1);
}
#if NBPFILTER > 0
/* See if bpf wants to look at the packet. */
if (sc->sc_bpf)
bpf_mtap(sc->sc_bpf, m0);
#endif
/*
* Put the packet on the appropriate queue.
*/
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
splx(s);
sc->sc_if.if_oerrors++;
error = ENOBUFS;
goto bad;
}
IF_ENQUEUE(ifq, m0);
/*
* Tell the device to send it out.
*/
(*sc->sc_start)(sc);
splx(s);
return (0);
bad:
m_freem(m0);
return (error);
}
/*
* Grab another packet off a queue and apply VJ compression,
* address/control and/or protocol compression if appropriate.
*/
struct mbuf *
ppp_dequeue(sc)
struct ppp_softc *sc;
{
int s;
struct mbuf *m;
u_char *cp;
int address, control, protocol;
s = splimp();
IF_DEQUEUE(&sc->sc_fastq, m);
if (m == NULL)
IF_DEQUEUE(&sc->sc_if.if_snd, m);
splx(s);
if (m == NULL)
return NULL;
/*
* Extract the ppp header of the new packet.
* The ppp header will be in one mbuf.
*/
cp = mtod(m, u_char *);
address = cp[0];
control = cp[1];
protocol = (cp[2] << 8) + cp[3];
#ifdef VJC
/*
* If the packet is a TCP/IP packet, see if we can compress it.
*/
if (protocol == PPP_IP && sc->sc_flags & SC_COMP_TCP) {
struct ip *ip;
int type;
struct mbuf *mp;
mp = m;
ip = (struct ip *) (cp + PPP_HDRLEN);
if (mp->m_len <= PPP_HDRLEN) {
mp = mp->m_next;
ip = mtod(mp, struct ip *);
}
/* this code assumes the IP/TCP header is in one non-shared mbuf */
if (ip->ip_p == IPPROTO_TCP) {
type = sl_compress_tcp(mp, ip, &sc->sc_comp,
!(sc->sc_flags & SC_NO_TCP_CCID));
switch (type) {
case TYPE_UNCOMPRESSED_TCP:
protocol = PPP_VJC_UNCOMP;
break;
case TYPE_COMPRESSED_TCP:
protocol = PPP_VJC_COMP;
cp = mtod(m, u_char *);
cp[0] = address; /* header has moved */
cp[1] = control;
cp[2] = 0;
break;
}
cp[3] = protocol; /* update protocol in PPP header */
}
}
#endif /* VJC */
#ifdef BSD_COMP
if (protocol < PPP_COMP && (sc->sc_flags & SC_BSD_COMP)) {
slen = m_totallen(m0);
clen = pf_bsd_comp(sc->sc_bsd_db, cbuf, proto, m0, slen);
}
#endif /* BSD_COMP */
/*
* Compress the address/control and protocol, if possible.
*/
if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
control == PPP_UI && protocol != PPP_ALLSTATIONS &&
protocol != PPP_LCP) {
/* can compress address/control */
m->m_data += 2;
m->m_len -= 2;
}
if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
/* can compress protocol */
if (mtod(m, u_char *) == cp) {
cp[2] = cp[1]; /* move address/control up */
cp[1] = cp[0];
}
++m->m_data;
--m->m_len;
}
return m;
}
/*
* This gets called from pppoutput when a new packet is
* put on a queue.
*/
static int
pppasyncstart(sc)
register struct ppp_softc *sc;
{
register struct tty *tp = (struct tty *) sc->sc_devp;
pppstart(tp);
return 0;
}
/*
* Start output on async tty interface. Get another datagram
* to send from the interface queue and start sending it.
*/
int
pppstart(tp)
register struct tty *tp;
{
register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
register struct mbuf *m;
register int len;
register u_char *start, *stop, *cp;
int n, s, ndone, done;
struct mbuf *m2;
if ((tp->t_state & TS_CONNECTED) == 0) {
/* sorry, I can't talk now */
return 0;
}
if (sc == NULL || tp != (struct tty *) sc->sc_devp) {
(*tp->t_oproc)(tp);
return 0;
}
for (;;) {
/*
* Call output process whether or not there is any output.
* We are being called in lieu of ttstart and must do what
* it would.
*/
if (tp->t_oproc != NULL) {
(*tp->t_oproc)(tp);
if (CCOUNT(&tp->t_outq) > PPP_HIWAT)
return 0;
}
/*
* See if we have an existing packet partly sent.
* If not, get a new packet and start sending it.
* We take packets on the priority queue ahead of those
* on the normal queue.
*/
m = sc->sc_outm;
if (m == NULL) {
/*
* Get another packet to be sent
*/
m = ppp_dequeue(sc);
if (m == NULL)
return 0;
/*
* 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_bytessent;
(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_bytessent += 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_bytessent += 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) {
m->m_data = start;
m->m_len = len;
sc->sc_outm = m;
if (tp->t_oproc != NULL)
(*tp->t_oproc)(tp);
return 0; /* can't do any more at the moment */
}
/* Finished with this mbuf; free it and move on. */
MFREE(m, m2);
if (m2 == NULL)
break;
m = m2;
sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
}
/* Finished a packet */
sc->sc_outm = NULL;
sc->sc_bytessent++; /* account for closing flag */
sc->sc_if.if_opackets++;
sc->sc_if.if_obytes = sc->sc_bytessent;
}
return 0;
}
/*
* Allocate enough mbuf to handle current MRU.
*/
static int
pppgetm(sc)
register struct ppp_softc *sc;
{
struct mbuf *m, **mp;
int len = HDROFF + sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN;
int s;
s = splimp();
for (mp = &sc->sc_m; (m = *mp) != NULL; mp = &m->m_next)
if ((len -= M_DATASIZE(m)) <= 0) {
splx(s);
return (1);
}
for (;; mp = &m->m_next) {
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(sc->sc_m);
sc->sc_m = NULL;
splx(s);
printf("ppp%d: can't allocate mbuf\n", sc->sc_if.if_unit);
return (0);
}
*mp = m;
MCLGET(m, M_DONTWAIT);
if ((len -= M_DATASIZE(m)) <= 0) {
splx(s);
return (1);
}
}
}
/*
* Copy mbuf chain. Would like to use m_copy(), but we need a real copy
* of the data, not just copies of pointers to the data.
*/
static struct mbuf *
ppp_btom(sc)
struct ppp_softc *sc;
{
register struct mbuf *m, **mp;
struct mbuf *top = sc->sc_m;
/*
* First check current mbuf. If we have more than a small mbuf,
* return the whole cluster and set beginning of buffer to the
* next mbuf.
* Else, copy the current bytes into a small mbuf, attach the new
* mbuf to the end of the chain and set beginning of buffer to the
* current mbuf.
*/
if (sc->sc_mc->m_len > MHLEN) {
sc->sc_m = sc->sc_mc->m_next;
sc->sc_mc->m_next = NULL;
}
else {
/* rather than waste a whole cluster on <= MHLEN bytes,
alloc a small mbuf and copy to it */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (NULL);
bcopy(mtod(sc->sc_mc, caddr_t), mtod(m, caddr_t), sc->sc_mc->m_len);
m->m_len = sc->sc_mc->m_len;
for (mp = &top; *mp != sc->sc_mc; mp = &(*mp)->m_next)
;
*mp = m;
sc->sc_m = sc->sc_mc;
}
/*
* Try to allocate enough extra mbufs to handle the next packet.
*/
if (pppgetm(sc) == 0) {
m_freem(top);
if (pppgetm(sc) == 0)
sc->sc_if.if_flags &= ~IFF_UP;
return (NULL);
}
return (top);
}
/*
* PPP packet input routine.
* The caller has checked and removed the FCS.
* The return value is 1 if the packet was put on sc->sc_inq,
* 0 otherwise.
*/
#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
TYPE_UNCOMPRESSED_TCP)
int
ppppktin(sc, m, ilen)
struct ppp_softc *sc;
struct mbuf *m;
int ilen;
{
struct ifqueue *inq;
int s, xlen, proto, rv;
struct ppp_header hdr;
sc->sc_if.if_ipackets++;
rv = 0;
hdr = *mtod(m, struct ppp_header *);
proto = ntohs(hdr.ph_protocol);
#ifdef VJC
/*
* See if we have a VJ-compressed packet to uncompress.
*/
if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) {
char *pkttype = proto == PPP_VJC_COMP? "": "un";
if (sc->sc_flags & SC_REJ_COMP_TCP) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: %scomp pkt w/o compression; flags 0x%x\n",
sc->sc_if.if_unit, pkttype, sc->sc_flags);
sc->sc_if.if_ierrors++;
return 0;
}
m->m_data += PPP_HDRLEN;
m->m_len -= PPP_HDRLEN;
ilen -= PPP_HDRLEN;
xlen = sl_uncompress_tcp_part((u_char **)(&m->m_data),
m->m_len, ilen,
COMPTYPE(proto), &sc->sc_comp);
if (xlen == 0) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: sl_uncompress failed on type %scomp\n",
sc->sc_if.if_unit, pkttype);
sc->sc_if.if_ierrors++;
return 0;
}
/* adjust the first mbuf by the decompressed amt */
xlen += PPP_HDRLEN;
m->m_len += xlen - ilen;
ilen = xlen;
m->m_data -= PPP_HDRLEN;
proto = PPP_IP;
/* put the ppp header back in place */
hdr.ph_protocol = htons(PPP_IP);
*mtod(m, struct ppp_header *) = hdr;
}
#endif /* VJC */
/* get this packet as an mbuf chain */
if ((m = ppp_btom(sc)) == NULL) {
sc->sc_if.if_ierrors++;
return 0;
}
m->m_pkthdr.len = ilen;
m->m_pkthdr.rcvif = &sc->sc_if;
#if NBPFILTER > 0
/* See if bpf wants to look at the packet. */
if (sc->sc_bpf)
bpf_mtap(sc->sc_bpf, m);
#endif
switch (proto) {
#ifdef INET
case PPP_IP:
/*
* IP packet - take off the ppp header and pass it up to IP.
*/
if ((sc->sc_if.if_flags & IFF_UP) == 0
|| (sc->sc_flags & SC_ENABLE_IP) == 0) {
/* interface is down - drop the packet. */
m_freem(m);
return 0;
}
m->m_pkthdr.len -= PPP_HDRLEN;
m->m_data += PPP_HDRLEN;
m->m_len -= PPP_HDRLEN;
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
default:
/*
* Some other protocol - place on input queue for read().
*/
inq = &sc->sc_inq;
rv = 1;
break;
}
/*
* Put the packet on the appropriate input queue.
*/
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: queue full\n", sc->sc_if.if_unit);
sc->sc_if.if_ierrors++;
sc->sc_if.if_iqdrops++;
m_freem(m);
rv = 0;
} else
IF_ENQUEUE(inq, m);
splx(s);
return rv;
}
/*
* tty interface receiver interrupt.
*/
static unsigned paritytab[8] = {
0x96696996, 0x69969669, 0x69969669, 0x96696996,
0x69969669, 0x96696996, 0x96696996, 0x69969669
};
int
pppinput(c, tp)
int c;
register struct tty *tp;
{
register struct ppp_softc *sc;
struct mbuf *m;
int ilen;
tk_nin++;
sc = (struct ppp_softc *) tp->t_sc;
if (sc == NULL || tp != (struct tty *) sc->sc_devp)
return 0;
++sc->sc_bytesrcvd;
if ((tp->t_state & TS_CONNECTED) == 0) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: no carrier\n", sc->sc_if.if_unit);
goto flush;
}
if (c & TTY_ERRORMASK) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: line error %x\n", sc->sc_if.if_unit, c & TTY_ERRORMASK);
goto flush;
}
c &= TTY_CHARMASK;
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 (sc->sc_flags & SC_LOG_RAWIN)
ppplogchar(sc, c);
if (c == PPP_FLAG) {
ilen = sc->sc_ilen;
sc->sc_ilen = 0;
sc->sc_if.if_ibytes = sc->sc_bytesrcvd;
if (sc->sc_rawin_count > 0)
ppplogchar(sc, -1);
/*
* 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) {
#ifdef VJC
/*
* If we've missed a packet, we must toss subsequent compressed
* packets which don't have an explicit connection ID.
*/
sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &sc->sc_comp);
#endif
if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: bad fcs\n", sc->sc_if.if_unit);
sc->sc_if.if_ierrors++;
} else
sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
return 0;
}
if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
if (ilen) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
sc->sc_if.if_ierrors++;
}
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--;
m = sc->sc_m;
if (sc->sc_flags & SC_LOG_INPKT) {
printf("ppp%d: got %d bytes\n", sc->sc_if.if_unit, ilen);
pppdumpm(m, ilen);
}
if (ppppktin(sc, m, ilen)) {
/* Put a placeholder byte in canq for ttselect()/ttnread(). */
putc(0, &tp->t_canq);
ttwakeup(tp);
}
return 0;
}
if (sc->sc_flags & SC_FLUSH) {
if (sc->sc_flags & SC_LOG_FLUSH)
ppplogchar(sc, c);
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) {
/* reset the first input mbuf */
m = sc->sc_m;
m->m_len = 0;
m->m_data = M_DATASTART(sc->sc_m) + HDROFF;
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) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
sc->sc_if.if_unit, c);
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) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: missing UI (0x3), got 0x%x\n",
sc->sc_if.if_unit, c);
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) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
(sc->sc_mp[-1] << 8) + c);
goto flush;
}
/* packet beyond configured mru? */
if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
goto flush;
}
/* is this mbuf full? */
m = sc->sc_mc;
if (M_TRAILINGSPACE(m) <= 0) {
sc->sc_mc = m = m->m_next;
if (m == NULL) {
printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
goto flush;
}
m->m_len = 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_flags |= SC_FLUSH;
if (sc->sc_flags & SC_LOG_FLUSH)
ppplogchar(sc, c);
}
return 0;
}
/*
* Process an ioctl request to interface.
*/
int
pppioctl(ifp, cmd, data)
register struct ifnet *ifp;
int cmd;
caddr_t data;
{
struct proc *p = curproc; /* XXX */
register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
register struct ifaddr *ifa = (struct ifaddr *)data;
register struct ifreq *ifr = (struct ifreq *)data;
int s = splimp(), error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_RUNNING) == 0)
ifp->if_flags &= ~IFF_UP;
break;
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
break;
case SIOCSIFDSTADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
break;
case SIOCSIFMTU:
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
if (ifr->ifr_mtu > PPP_MAXMTU)
error = EINVAL;
else {
struct tty *tp;
sc->sc_if.if_mtu = ifr->ifr_mtu;
tp = (struct tty *) sc->sc_devp;
if (tp != NULL)
clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
sc->sc_if.if_mtu + PPP_HIWAT);
}
break;
case SIOCGIFMTU:
ifr->ifr_mtu = sc->sc_if.if_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
switch(ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
default:
error = EINVAL;
}
splx(s);
return (error);
}
#define MAX_DUMP_BYTES 128
static void
pppdumpm(m0, pktlen)
struct mbuf *m0;
int pktlen;
{
char buf[3*MAX_DUMP_BYTES+4];
char *bp = buf;
struct mbuf *m;
static char digits[] = "0123456789abcdef";
for (m = m0; m && pktlen; m = m->m_next) {
int l = m->m_len;
u_char *rptr = (u_char *)m->m_data;
if (pktlen > 0) {
if (l > pktlen)
l = pktlen;
pktlen -= l;
}
while (l--) {
if (bp > buf + sizeof(buf) - 4)
goto done;
*bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
*bp++ = digits[*rptr++ & 0xf];
}
if (m->m_next) {
if (bp > buf + sizeof(buf) - 3)
goto done;
*bp++ = '|';
} else
*bp++ = ' ';
}
done:
if (m && pktlen)
*bp++ = '>';
*bp = 0;
printf("%s\n", buf);
}
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);
}
PSEUDO_SET(pppattach, if_ppp);
#endif /* NPPP > 0 */
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