-/* @(#)if_sl.c 5.3 (Berkeley) %G% */
+/*
+ * Copyright (c) 1987, 1989, 1992, 1993
+ * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)if_sl.c 8.1 (Berkeley) 6/10/93
+ */
/*
* Serial Line interface
*
* Converted to 4.3BSD Beta by Chris Torek.
* Other changes made at Berkeley, based in part on code by Kirk Smith.
+ * W. Jolitz added slip abort.
+ *
+ * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov).
+ * Added priority queuing for "interactive" traffic; hooks for TCP
+ * header compression; ICMP filtering (at 2400 baud, some cretin
+ * pinging you can use up all your bandwidth). Made low clist behavior
+ * more robust and slightly less likely to hang serial line.
+ * Sped up a bunch of things.
+ *
+ * Note that splimp() is used throughout to block both (tty) input
+ * interrupts and network activity; thus, splimp must be >= spltty.
*/
-/* $Header: if_sl.c,v 1.12 85/12/20 21:54:55 chris Exp $ */
-/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
-
#include "sl.h"
#if NSL > 0
-#include "param.h"
-#include "mbuf.h"
-#include "buf.h"
-#include "dk.h"
-#include "socket.h"
-#include "ioctl.h"
-#include "file.h"
-#include "tty.h"
-#include "errno.h"
-
-#include "if.h"
-#include "netisr.h"
-#include "route.h"
+#include <sys/param.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 <machine/cpu.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/ip.h"
-#include "../netinet/ip_var.h"
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#else
+Huh? Slip without inet?
#endif
-#ifdef vax
-#include "../vax/mtpr.h"
-#endif vax
+#include <net/slcompress.h>
+#include <net/if_slvar.h>
+
+/*
+ * SLMAX is a hard limit on input packet size. To simplify the code
+ * and improve performance, we require that packets fit in an mbuf
+ * cluster, and if we get a compressed packet, there's enough extra
+ * room to expand the header into a max length tcp/ip header (128
+ * bytes). So, SLMAX can be at most
+ * MCLBYTES - 128
+ *
+ * SLMTU is a hard limit on output packet size. To insure good
+ * interactive response, SLMTU wants to be the smallest size that
+ * amortizes the header cost. (Remember that even with
+ * type-of-service queuing, we have to wait for any in-progress
+ * packet to finish. I.e., we wait, on the average, 1/2 * mtu /
+ * cps, where cps is the line speed in characters per second.
+ * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The
+ * average compressed header size is 6-8 bytes so any MTU > 90
+ * bytes will give us 90% of the line bandwidth. A 100ms wait is
+ * tolerable (500ms is not), so want an MTU around 296. (Since TCP
+ * will send 256 byte segments (to allow for 40 byte headers), the
+ * typical packet size on the wire will be around 260 bytes). In
+ * 4.3tahoe+ systems, we can set an MTU in a route so we do that &
+ * leave the interface MTU relatively high (so we don't IP fragment
+ * when acting as a gateway to someone using a stupid MTU).
+ *
+ * Similar considerations apply to SLIP_HIWAT: It's the amount of
+ * data that will be queued 'downstream' of us (i.e., in clists
+ * waiting to be picked up by the tty output interrupt). If we
+ * queue a lot of data downstream, it's immune to our t.o.s. queuing.
+ * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed
+ * telnet/ftp will see a 1 sec wait, independent of the mtu (the
+ * wait is dependent on the ftp window size but that's typically
+ * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize
+ * the cost (in idle time on the wire) of the tty driver running
+ * off the end of its clists & having to call back slstart for a
+ * new packet. For a tty interface with any buffering at all, this
+ * cost will be zero. Even with a totally brain dead interface (like
+ * the one on a typical workstation), the cost will be <= 1 character
+ * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose
+ * at most 1% while maintaining good interactive response.
+ */
+#define BUFOFFSET 128
+#define SLMAX (MCLBYTES - BUFOFFSET)
+#define SLBUFSIZE (SLMAX + BUFOFFSET)
+#define SLMTU 296
+#define SLIP_HIWAT roundup(50,CBSIZE)
+#define CLISTRESERVE 1024 /* Can't let clists get too low */
/*
- * N.B.: SLMTU is now a hard limit on input packet size.
- * SLMTU must be <= CLBYTES - sizeof(struct ifnet *).
+ * SLIP ABORT ESCAPE MECHANISM:
+ * (inspired by HAYES modem escape arrangement)
+ * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape }
+ * within window time signals a "soft" exit from slip mode by remote end
+ * if the IFF_DEBUG flag is on.
*/
-#define SLMTU 1006
-#define SLIP_HIWAT 1000 /* don't start a new packet if HIWAT on queue */
-#define CLISTRESERVE 1000 /* Can't let clists get too low */
-
-struct sl_softc {
- struct ifnet sc_if; /* network-visible interface */
- short sc_flags; /* see below */
- short sc_ilen; /* length of input-packet-so-far */
- struct tty *sc_ttyp; /* pointer to tty structure */
- char *sc_mp; /* pointer to next available buf char */
- char *sc_buf; /* input buffer */
-} sl_softc[NSL];
-
-/* flags */
-#define SC_ESCAPED 0x0001 /* saw a FRAME_ESCAPE */
-#define SC_OACTIVE 0x0002 /* output tty is active */
-
-#define FRAME_END 0300 /* Frame End */
-#define FRAME_ESCAPE 0333 /* Frame Esc */
-#define TRANS_FRAME_END 0334 /* transposed frame end */
-#define TRANS_FRAME_ESCAPE 0335 /* transposed frame esc */
+#define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/
+#define ABT_IDLE 1 /* in seconds - idle before an escape */
+#define ABT_COUNT 3 /* count of escapes for abort */
+#define ABT_WINDOW (ABT_COUNT*2+2) /* in seconds - time to count */
+
+struct sl_softc sl_softc[NSL];
+
+#define FRAME_END 0xc0 /* Frame End */
+#define FRAME_ESCAPE 0xdb /* Frame Esc */
+#define TRANS_FRAME_END 0xdc /* transposed frame end */
+#define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */
#define t_sc T_LINEP
-int sloutput(), slioctl(), ttrstrt();
+extern struct timeval time;
+
+static int slinit __P((struct sl_softc *));
+static struct mbuf *sl_btom __P((struct sl_softc *, int));
/*
* Called from boot code to establish sl interfaces.
*/
+void
slattach()
{
register struct sl_softc *sc;
for (sc = sl_softc; i < NSL; sc++) {
sc->sc_if.if_name = "sl";
+ sc->sc_if.if_next = NULL;
sc->sc_if.if_unit = i++;
sc->sc_if.if_mtu = SLMTU;
- sc->sc_if.if_flags = IFF_POINTOPOINT;
+ sc->sc_if.if_flags =
+ IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST;
+ sc->sc_if.if_type = IFT_SLIP;
sc->sc_if.if_ioctl = slioctl;
sc->sc_if.if_output = sloutput;
- sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_if.if_snd.ifq_maxlen = 50;
+ sc->sc_fastq.ifq_maxlen = 32;
if_attach(&sc->sc_if);
}
}
+static int
+slinit(sc)
+ register struct sl_softc *sc;
+{
+ register caddr_t p;
+
+ if (sc->sc_ep == (u_char *) 0) {
+ MCLALLOC(p, M_WAIT);
+ if (p)
+ sc->sc_ep = (u_char *)p + SLBUFSIZE;
+ else {
+ printf("sl%d: can't allocate buffer\n", sc - sl_softc);
+ sc->sc_if.if_flags &= ~IFF_UP;
+ return (0);
+ }
+ }
+ sc->sc_buf = sc->sc_ep - SLMAX;
+ sc->sc_mp = sc->sc_buf;
+ sl_compress_init(&sc->sc_comp);
+ return (1);
+}
+
/*
* Line specific open routine.
* Attach the given tty to the first available sl unit.
*/
/* ARGSUSED */
+int
slopen(dev, tp)
dev_t dev;
register struct tty *tp;
{
+ struct proc *p = curproc; /* XXX */
register struct sl_softc *sc;
register int nsl;
+ int error;
+
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
- if (!suser())
- return (EPERM);
if (tp->t_line == SLIPDISC)
- return (EBUSY);
+ return (0);
- for (nsl = 0, sc = sl_softc; nsl < NSL; nsl++, sc++)
+ for (nsl = NSL, sc = sl_softc; --nsl >= 0; sc++)
if (sc->sc_ttyp == NULL) {
- sc->sc_flags = 0;
- sc->sc_ilen = 0;
if (slinit(sc) == 0)
return (ENOBUFS);
tp->t_sc = (caddr_t)sc;
sc->sc_ttyp = tp;
+ sc->sc_if.if_baudrate = tp->t_ospeed;
ttyflush(tp, FREAD | FWRITE);
return (0);
}
-
return (ENXIO);
}
/*
* Line specific close routine.
* Detach the tty from the sl unit.
- * Mimics part of ttyclose().
*/
+void
slclose(tp)
struct tty *tp;
{
int s;
ttywflush(tp);
+ s = splimp(); /* actually, max(spltty, splnet) */
tp->t_line = 0;
- s = splimp(); /* paranoid; splnet probably ok */
sc = (struct sl_softc *)tp->t_sc;
if (sc != NULL) {
if_down(&sc->sc_if);
sc->sc_ttyp = NULL;
tp->t_sc = NULL;
- MCLFREE((struct mbuf *)sc->sc_buf);
+ MCLFREE((caddr_t)(sc->sc_ep - SLBUFSIZE));
+ sc->sc_ep = 0;
+ sc->sc_mp = 0;
sc->sc_buf = 0;
}
splx(s);
* Provide a way to get the sl unit number.
*/
/* ARGSUSED */
+int
sltioctl(tp, cmd, data, flag)
struct tty *tp;
+ int cmd;
caddr_t data;
+ int flag;
{
+ struct sl_softc *sc = (struct sl_softc *)tp->t_sc;
+ int s;
- if (cmd == TIOCGETD) {
- *(int *)data = ((struct sl_softc *)tp->t_sc)->sc_if.if_unit;
- return (0);
+ switch (cmd) {
+ case SLIOCGUNIT:
+ *(int *)data = sc->sc_if.if_unit;
+ break;
+
+ default:
+ return (-1);
}
- return (-1);
+ return (0);
}
/*
* Queue a packet. Start transmission if not active.
*/
-sloutput(ifp, m, dst)
- register struct ifnet *ifp;
+int
+sloutput(ifp, m, dst, rtp)
+ struct ifnet *ifp;
register struct mbuf *m;
struct sockaddr *dst;
+ struct rtentry *rtp;
{
- register struct sl_softc *sc;
+ register struct sl_softc *sc = &sl_softc[ifp->if_unit];
+ register struct ip *ip;
+ register struct ifqueue *ifq;
+ register int p;
int s;
/*
* the line protocol to support other address families.
*/
if (dst->sa_family != AF_INET) {
- printf("sl%d: af%d not supported\n", ifp->if_unit,
+ printf("sl%d: af%d not supported\n", sc->sc_if.if_unit,
dst->sa_family);
m_freem(m);
+ sc->sc_if.if_noproto++;
return (EAFNOSUPPORT);
}
- sc = &sl_softc[ifp->if_unit];
if (sc->sc_ttyp == NULL) {
m_freem(m);
return (ENETDOWN); /* sort of */
}
+ if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0) {
+ m_freem(m);
+ return (EHOSTUNREACH);
+ }
+ ifq = &sc->sc_if.if_snd;
+ ip = mtod(m, struct ip *);
+ if (ip->ip_tos & IPTOS_LOWDELAY) {
+ ifq = &sc->sc_fastq;
+ p = 1;
+ } else
+ p = 0;
+ if (ip->ip_p == IPPROTO_TCP) {
+ if (sc->sc_if.if_flags & SC_COMPRESS) {
+ /*
+ * The last parameter turns off connection id
+ * compression for background traffic: Since
+ * fastq traffic can jump ahead of the background
+ * traffic, we don't know what order packets will
+ * go on the line.
+ */
+ p = sl_compress_tcp(m, ip, &sc->sc_comp, p);
+ *mtod(m, u_char *) |= p;
+ }
+ } else if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) {
+ m_freem(m);
+ return (ENETRESET); /* XXX ? */
+ }
s = splimp();
- if (IF_QFULL(&ifp->if_snd)) {
- IF_DROP(&ifp->if_snd);
- splx(s);
+ if (IF_QFULL(ifq)) {
+ IF_DROP(ifq);
m_freem(m);
+ splx(s);
sc->sc_if.if_oerrors++;
return (ENOBUFS);
}
- IF_ENQUEUE(&ifp->if_snd, m);
- if ((sc->sc_flags & SC_OACTIVE) == 0) {
- splx(s);
+ IF_ENQUEUE(ifq, m);
+ sc->sc_if.if_lastchange = time;
+ if (sc->sc_ttyp->t_outq.c_cc == 0)
slstart(sc->sc_ttyp);
- } else
- splx(s);
+ splx(s);
return (0);
}
* to send from the interface queue and map it to
* the interface before starting output.
*/
+void
slstart(tp)
register struct tty *tp;
{
register struct sl_softc *sc = (struct sl_softc *)tp->t_sc;
register struct mbuf *m;
- register int len;
register u_char *cp;
- int flush, nd, np, n, s;
+ int s;
struct mbuf *m2;
extern int cfreecount;
* We are being called in lieu of ttstart and must do what
* it would.
*/
- if (tp->t_outq.c_cc > 0)
- ttstart(tp);
- if (tp->t_outq.c_cc > SLIP_HIWAT)
- return;
-
+ if (tp->t_outq.c_cc != 0) {
+ (*tp->t_oproc)(tp);
+ if (tp->t_outq.c_cc > SLIP_HIWAT)
+ return;
+ }
/*
* This happens briefly when the line shuts down.
*/
return;
/*
- * If system is getting low on clists
- * and we have something running already, stop here.
+ * Get a packet and send it to the interface.
*/
- if (cfreecount < CLISTRESERVE + SLMTU &&
- sc->sc_flags & SC_OACTIVE)
+ s = splimp();
+ IF_DEQUEUE(&sc->sc_fastq, m);
+ if (m)
+ sc->sc_if.if_omcasts++; /* XXX */
+ else
+ IF_DEQUEUE(&sc->sc_if.if_snd, m);
+ splx(s);
+ if (m == NULL)
return;
+ sc->sc_if.if_lastchange = time;
/*
- * Get a packet and send it to the interface.
+ * If system is getting low on clists, just flush our
+ * output queue (if the stuff was important, it'll get
+ * retransmitted).
*/
- s = splimp();
- IF_DEQUEUE(&sc->sc_if.if_snd, m);
- if (m == NULL) {
- if (tp->t_outq.c_cc == 0)
- sc->sc_flags &= ~SC_OACTIVE;
- splx(s);
- return;
+ if (cfreecount < CLISTRESERVE + SLMTU) {
+ m_freem(m);
+ sc->sc_if.if_collisions++;
+ continue;
}
- flush = !(sc->sc_flags & SC_OACTIVE);
- sc->sc_flags |= SC_OACTIVE;
- splx(s);
-
/*
* The extra FRAME_END 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 (flush)
+ if (tp->t_outq.c_cc == 0) {
+ ++sc->sc_if.if_obytes;
(void) putc(FRAME_END, &tp->t_outq);
+ }
while (m) {
- cp = mtod(m, u_char *);
- len = m->m_len;
- while (len > 0) {
+ register u_char *ep;
+
+ cp = mtod(m, u_char *); ep = cp + m->m_len;
+ while (cp < ep) {
/*
* Find out how many bytes in the string we can
* handle without doing something special.
*/
- nd = locc(FRAME_ESCAPE, len, cp);
- np = locc(FRAME_END, len, cp);
- n = len - MAX(nd, np);
- if (n) {
+ register u_char *bp = cp;
+
+ while (cp < ep) {
+ switch (*cp++) {
+ case FRAME_ESCAPE:
+ case FRAME_END:
+ --cp;
+ goto out;
+ }
+ }
+ out:
+ if (cp > bp) {
/*
* Put n characters at once
* into the tty output queue.
*/
- if (b_to_q((char *)cp, n, &tp->t_outq))
+ if (b_to_q((char *)bp, cp - bp, &tp->t_outq))
break;
+ sc->sc_if.if_obytes += cp - bp;
}
/*
* If there are characters left in the mbuf,
* the first one must be special..
* Put it out in a different form.
*/
- if (len) {
+ if (cp < ep) {
if (putc(FRAME_ESCAPE, &tp->t_outq))
break;
- if (putc(*cp == FRAME_ESCAPE ?
+ if (putc(*cp++ == FRAME_ESCAPE ?
TRANS_FRAME_ESCAPE : TRANS_FRAME_END,
&tp->t_outq)) {
(void) unputc(&tp->t_outq);
break;
}
- cp++;
- len--;
+ sc->sc_if.if_obytes += 2;
}
}
MFREE(m, m2);
(void) unputc(&tp->t_outq);
(void) putc(FRAME_END, &tp->t_outq);
sc->sc_if.if_collisions++;
- } else
- sc->sc_if.if_opackets++;
- }
-}
-
-slinit(sc)
- register struct sl_softc *sc;
-{
- struct mbuf *p;
-
- if (sc->sc_buf == (char *) 0) {
- MCLALLOC(p, 1);
- if (p) {
- sc->sc_buf = (char *)p;
- sc->sc_mp = sc->sc_buf + sizeof(struct ifnet *);
} else {
- printf("sl%d: can't allocate buffer\n", sc - sl_softc);
- sc->sc_if.if_flags &= ~IFF_UP;
- return (0);
+ ++sc->sc_if.if_obytes;
+ sc->sc_if.if_opackets++;
}
}
- return (1);
}
/*
- * Copy data buffer to mbuf chain; add ifnet pointer ifp.
+ * Copy data buffer to mbuf chain; add ifnet pointer.
*/
-struct mbuf *
-sl_btom(sc, len, ifp)
- struct sl_softc *sc;
+static struct mbuf *
+sl_btom(sc, len)
+ register struct sl_softc *sc;
register int len;
- struct ifnet *ifp;
{
- register caddr_t cp;
- register struct mbuf *m, **mp;
- register unsigned count;
- struct mbuf *top = NULL;
-
- cp = sc->sc_buf + sizeof(struct ifnet *);
- mp = ⊤
- while (len > 0) {
- MGET(m, M_DONTWAIT, MT_DATA);
- if ((*mp = m) == NULL) {
- m_freem(top);
+ register struct mbuf *m;
+
+ MGETHDR(m, M_DONTWAIT, MT_DATA);
+ if (m == NULL)
+ return (NULL);
+
+ /*
+ * If we have more than MHLEN bytes, it's cheaper to
+ * queue the cluster we just filled & allocate a new one
+ * for the input buffer. Otherwise, fill the mbuf we
+ * allocated above. Note that code in the input routine
+ * guarantees that packet will fit in a cluster.
+ */
+ if (len >= MHLEN) {
+ MCLGET(m, M_DONTWAIT);
+ if ((m->m_flags & M_EXT) == 0) {
+ /*
+ * we couldn't get a cluster - if memory's this
+ * low, it's time to start dropping packets.
+ */
+ (void) m_free(m);
return (NULL);
}
- if (ifp)
- m->m_off += sizeof(ifp);
- /*
- * If we have at least NBPG bytes,
- * allocate a new page. Swap the current buffer page
- * with the new one. We depend on having a space
- * left at the beginning of the buffer
- * for the interface pointer.
- */
- if (len >= NBPG) {
- MCLGET(m);
- if (m->m_len == CLBYTES) {
- cp = mtod(m, char *);
- m->m_off = (int)sc->sc_buf - (int)m;
- sc->sc_buf = mtod(m, char *);
- if (ifp) {
- m->m_off += sizeof(ifp);
- count = MIN(len,
- CLBYTES - sizeof(struct ifnet *));
- } else
- count = MIN(len, CLBYTES);
- goto nocopy;
- }
- }
- if (ifp)
- count = MIN(len, MLEN - sizeof(ifp));
- else
- count = MIN(len, MLEN);
- bcopy(cp, mtod(m, caddr_t), count);
-nocopy:
- m->m_len = count;
- if (ifp) {
- m->m_off -= sizeof(ifp);
- m->m_len += sizeof(ifp);
- *mtod(m, struct ifnet **) = ifp;
- ifp = NULL;
- }
- cp += count;
- len -= count;
- mp = &m->m_next;
- }
- return (top);
+ sc->sc_ep = mtod(m, u_char *) + SLBUFSIZE;
+ m->m_data = (caddr_t)sc->sc_buf;
+ m->m_ext.ext_buf = (caddr_t)((int)sc->sc_buf &~ MCLOFSET);
+ } else
+ bcopy((caddr_t)sc->sc_buf, mtod(m, caddr_t), len);
+
+ m->m_len = len;
+ m->m_pkthdr.len = len;
+ m->m_pkthdr.rcvif = &sc->sc_if;
+ return (m);
}
/*
* tty interface receiver interrupt.
*/
+void
slinput(c, tp)
register int c;
register struct tty *tp;
{
register struct sl_softc *sc;
register struct mbuf *m;
+ register int len;
int s;
tk_nin++;
sc = (struct sl_softc *)tp->t_sc;
if (sc == NULL)
return;
+ if (!(tp->t_state&TS_CARR_ON)) /* XXX */
+ return;
+
+ ++sc->sc_if.if_ibytes;
+ c &= 0xff; /* XXX */
+
+#ifdef ABT_ESC
+ if (sc->sc_if.if_flags & IFF_DEBUG) {
+ if (c == ABT_ESC) {
+ /*
+ * If we have a previous abort, see whether
+ * this one is within the time limit.
+ */
+ if (sc->sc_abortcount &&
+ time.tv_sec >= sc->sc_starttime + ABT_WINDOW)
+ sc->sc_abortcount = 0;
+ /*
+ * If we see an abort after "idle" time, count it;
+ * record when the first abort escape arrived.
+ */
+ if (time.tv_sec >= sc->sc_lasttime + ABT_IDLE) {
+ if (++sc->sc_abortcount == 1)
+ sc->sc_starttime = time.tv_sec;
+ if (sc->sc_abortcount >= ABT_COUNT) {
+ slclose(tp);
+ return;
+ }
+ }
+ } else
+ sc->sc_abortcount = 0;
+ sc->sc_lasttime = time.tv_sec;
+ }
+#endif
- c &= 0xff;
- if (sc->sc_flags & SC_ESCAPED) {
- sc->sc_flags &= ~SC_ESCAPED;
- switch (c) {
+ switch (c) {
- case TRANS_FRAME_ESCAPE:
+ case TRANS_FRAME_ESCAPE:
+ if (sc->sc_escape)
c = FRAME_ESCAPE;
- break;
+ break;
- case TRANS_FRAME_END:
+ case TRANS_FRAME_END:
+ if (sc->sc_escape)
c = FRAME_END;
- break;
+ break;
- default:
- sc->sc_if.if_ierrors++;
- sc->sc_mp = sc->sc_buf + sizeof(struct ifnet *);
- sc->sc_ilen = 0;
- return;
- }
- } else {
- switch (c) {
+ case FRAME_ESCAPE:
+ sc->sc_escape = 1;
+ return;
- case FRAME_END:
- if (sc->sc_ilen == 0) /* ignore */
- return;
- m = sl_btom(sc, sc->sc_ilen, &sc->sc_if);
- if (m == NULL) {
- sc->sc_if.if_ierrors++;
- return;
- }
- sc->sc_mp = sc->sc_buf + sizeof(struct ifnet *);
- sc->sc_ilen = 0;
- sc->sc_if.if_ipackets++;
- s = splimp();
- if (IF_QFULL(&ipintrq)) {
- IF_DROP(&ipintrq);
- sc->sc_if.if_ierrors++;
- m_freem(m);
- } else {
- IF_ENQUEUE(&ipintrq, m);
- schednetisr(NETISR_IP);
- }
- splx(s);
- return;
+ case FRAME_END:
+ len = sc->sc_mp - sc->sc_buf;
+ if (len < 3)
+ /* less than min length packet - ignore */
+ goto newpack;
+
+ if ((c = (*sc->sc_buf & 0xf0)) != (IPVERSION << 4)) {
+ if (c & 0x80)
+ c = TYPE_COMPRESSED_TCP;
+ else if (c == TYPE_UNCOMPRESSED_TCP)
+ *sc->sc_buf &= 0x4f; /* XXX */
+ /*
+ * We've got something that's not an IP packet.
+ * If compression is enabled, try to decompress it.
+ * Otherwise, if `auto-enable' compression is on and
+ * it's a reasonable packet, decompress it and then
+ * enable compression. Otherwise, drop it.
+ */
+ if (sc->sc_if.if_flags & SC_COMPRESS) {
+ len = sl_uncompress_tcp(&sc->sc_buf, len,
+ (u_int)c, &sc->sc_comp);
+ if (len <= 0)
+ goto error;
+ } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) &&
+ c == TYPE_UNCOMPRESSED_TCP && len >= 40) {
+ len = sl_uncompress_tcp(&sc->sc_buf, len,
+ (u_int)c, &sc->sc_comp);
+ if (len <= 0)
+ goto error;
+ sc->sc_if.if_flags |= SC_COMPRESS;
+ } else
+ goto error;
+ }
+ m = sl_btom(sc, len);
+ if (m == NULL)
+ goto error;
- case FRAME_ESCAPE:
- sc->sc_flags |= SC_ESCAPED;
- return;
+ sc->sc_if.if_ipackets++;
+ sc->sc_if.if_lastchange = time;
+ s = splimp();
+ if (IF_QFULL(&ipintrq)) {
+ IF_DROP(&ipintrq);
+ sc->sc_if.if_ierrors++;
+ sc->sc_if.if_iqdrops++;
+ m_freem(m);
+ } else {
+ IF_ENQUEUE(&ipintrq, m);
+ schednetisr(NETISR_IP);
}
+ splx(s);
+ goto newpack;
}
- if (++sc->sc_ilen >= SLMTU) {
- sc->sc_if.if_ierrors++;
- sc->sc_mp = sc->sc_buf + sizeof(struct ifnet *);
- sc->sc_ilen = 0;
+ if (sc->sc_mp < sc->sc_ep) {
+ *sc->sc_mp++ = c;
+ sc->sc_escape = 0;
return;
}
- *sc->sc_mp++ = c;
+error:
+ sc->sc_if.if_ierrors++;
+newpack:
+ sc->sc_mp = sc->sc_buf = sc->sc_ep - SLMAX;
+ sc->sc_escape = 0;
}
/*
* Process an ioctl request.
*/
+int
slioctl(ifp, cmd, data)
register struct ifnet *ifp;
int cmd;
caddr_t data;
{
register struct ifaddr *ifa = (struct ifaddr *)data;
- int s = splimp(), error = 0;
+ register struct ifreq *ifr;
+ register int s = splimp(), error = 0;
switch (cmd) {
case SIOCSIFADDR:
- if (ifa->ifa_addr.sa_family == AF_INET)
+ if (ifa->ifa_addr->sa_family == AF_INET)
ifp->if_flags |= IFF_UP;
else
error = EAFNOSUPPORT;
break;
case SIOCSIFDSTADDR:
- if (ifa->ifa_addr.sa_family != AF_INET)
+ if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
break;
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ ifr = (struct ifreq *)data;
+ if (ifr == 0) {
+ error = EAFNOSUPPORT; /* XXX */
+ break;
+ }
+ switch (ifr->ifr_addr.sa_family) {
+
+#ifdef INET
+ case AF_INET:
+ break;
+#endif
+
+ default:
+ error = EAFNOSUPPORT;
+ break;
+ }
+ break;
+#endif
+
default:
error = EINVAL;
}
splx(s);
return (error);
}
-#endif