9bf40ede4a
if_xname, if_dname, and if_dunit. if_xname is the name of the interface and if_dname/unit are the driver name and instance. This change paves the way for interface renaming and enhanced pseudo device creation and configuration symantics. Approved By: re (in principle) Reviewed By: njl, imp Tested On: i386, amd64, sparc64 Obtained From: NetBSD (if_xname)
1100 lines
27 KiB
C
1100 lines
27 KiB
C
/*
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* ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
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* tty devices.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Drew D. Perkins
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* Carnegie Mellon University
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* 4910 Forbes Ave.
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* Pittsburgh, PA 15213
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* (412) 268-8576
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* ddp@andrew.cmu.edu
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*
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* Based on:
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* @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
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*
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* Copyright (c) 1987 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Serial Line interface
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*
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* Rick Adams
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* Center for Seismic Studies
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* 1300 N 17th Street, Suite 1450
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* Arlington, Virginia 22209
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* (703)276-7900
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* rick@seismo.ARPA
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* seismo!rick
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*
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* Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
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* Converted to 4.3BSD Beta by Chris Torek.
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* Other changes made at Berkeley, based in part on code by Kirk Smith.
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*
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* Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
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* Added VJ tcp header compression; more unified ioctls
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*
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* Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
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* Cleaned up a lot of the mbuf-related code to fix bugs that
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* caused system crashes and packet corruption. Changed pppstart
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* so that it doesn't just give up with a "collision" if the whole
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* packet doesn't fit in the output ring buffer.
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*
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* Added priority queueing for interactive IP packets, following
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* the model of if_sl.c, plus hooks for bpf.
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* Paul Mackerras (paulus@cs.anu.edu.au).
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*/
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/* $FreeBSD$ */
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#include "opt_ppp.h" /* XXX for ppp_defs.h */
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#define VJC /* XXX for ppp_defs.h */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/fcntl.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/vnode.h>
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#ifdef PPP_FILTER
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#include <net/bpf.h>
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#endif
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#include <net/if_ppp.h>
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#include <net/if_pppvar.h>
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static int pppopen(dev_t dev, struct tty *tp);
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static int pppclose(struct tty *tp, int flag);
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static int pppread(struct tty *tp, struct uio *uio, int flag);
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static int pppwrite(struct tty *tp, struct uio *uio, int flag);
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static int ppptioctl(struct tty *tp, u_long cmd, caddr_t data,
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int flag, struct thread *td);
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static int pppinput(int c, struct tty *tp);
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static int pppstart(struct tty *tp);
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static u_short pppfcs(u_short fcs, u_char *cp, int len);
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static void pppasyncstart(struct ppp_softc *);
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static void pppasyncctlp(struct ppp_softc *);
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static void pppasyncrelinq(struct ppp_softc *);
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static void pppasyncsetmtu(struct ppp_softc *);
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static void ppp_timeout(void *);
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static void pppgetm(struct ppp_softc *sc);
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static void ppplogchar(struct ppp_softc *, int);
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/* XXX called from if_ppp.c - layering violation */
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void pppasyncattach(void *);
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void pppasyncdetach(void);
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/*
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* Some useful mbuf macros not in mbuf.h.
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*/
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#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
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#define M_DATASTART(m) \
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(M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
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(m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
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#define M_DATASIZE(m) \
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(M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
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(m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
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/*
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* Does c need to be escaped?
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*/
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#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
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/*
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* Procedures for using an async tty interface for PPP.
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*/
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/* This is a FreeBSD-2.X kernel. */
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#define CCOUNT(q) ((q)->c_cc)
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#define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */
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#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
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/*
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* Define the PPP line discipline.
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*/
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static struct linesw pppdisc = {
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pppopen, pppclose, pppread, pppwrite,
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ppptioctl, pppinput, pppstart, ttymodem,
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PPP_FLAG
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};
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void
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pppasyncattach(dummy)
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void *dummy;
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{
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ldisc_register(PPPDISC, &pppdisc);
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}
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void
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pppasyncdetach()
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{
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ldisc_deregister(PPPDISC);
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}
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/*
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* Line specific open routine for async tty devices.
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* Attach the given tty to the first available ppp unit.
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* Called from device open routine or ttioctl() at >= splsofttty()
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*/
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/* ARGSUSED */
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static int
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pppopen(dev, tp)
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dev_t dev;
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register struct tty *tp;
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{
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struct thread *td = curthread; /* XXX */
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register struct ppp_softc *sc;
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int error, s;
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if ((error = suser(td)) != 0)
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return (error);
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s = spltty();
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if (tp->t_line == PPPDISC) {
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sc = (struct ppp_softc *) tp->t_sc;
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if (sc != NULL && sc->sc_devp == (void *) tp) {
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splx(s);
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return (0);
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}
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}
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if ((sc = pppalloc(td->td_proc->p_pid)) == NULL) {
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splx(s);
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return ENXIO;
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}
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if (sc->sc_relinq)
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(*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
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sc->sc_ilen = 0;
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sc->sc_m = NULL;
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bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
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sc->sc_asyncmap[0] = 0xffffffff;
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sc->sc_asyncmap[3] = 0x60000000;
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sc->sc_rasyncmap = 0;
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sc->sc_devp = (void *) tp;
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sc->sc_start = pppasyncstart;
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sc->sc_ctlp = pppasyncctlp;
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sc->sc_relinq = pppasyncrelinq;
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sc->sc_setmtu = pppasyncsetmtu;
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sc->sc_outm = NULL;
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pppgetm(sc);
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sc->sc_if.if_flags |= IFF_RUNNING;
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getmicrotime(&sc->sc_if.if_lastchange);
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sc->sc_if.if_baudrate = tp->t_ospeed;
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tp->t_sc = (caddr_t) sc;
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ttyflush(tp, FREAD | FWRITE);
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/*
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* Pre-allocate cblocks to the "just right" amount. The 1 byte t_canq
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* allocation helps avoid the need for select and/or FIONREAD.
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* We also pass 1 byte tokens through t_canq...
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*/
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clist_alloc_cblocks(&tp->t_canq, 1, 1);
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clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
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sc->sc_if.if_mtu + PPP_HIWAT);
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clist_alloc_cblocks(&tp->t_rawq, 0, 0);
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splx(s);
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return (0);
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}
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/*
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* Line specific close routine, called from device close routine
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* and from ttioctl at >= splsofttty().
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* Detach the tty from the ppp unit.
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* Mimics part of ttyclose().
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*/
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static int
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pppclose(tp, flag)
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struct tty *tp;
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int flag;
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{
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register struct ppp_softc *sc;
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int s;
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s = spltty();
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ttyflush(tp, FREAD | FWRITE);
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clist_free_cblocks(&tp->t_canq);
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clist_free_cblocks(&tp->t_outq);
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tp->t_line = 0;
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sc = (struct ppp_softc *) tp->t_sc;
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if (sc != NULL) {
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tp->t_sc = NULL;
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if (tp == (struct tty *) sc->sc_devp) {
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pppasyncrelinq(sc);
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pppdealloc(sc);
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}
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}
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splx(s);
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return 0;
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}
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/*
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* Relinquish the interface unit to another device.
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*/
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static void
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pppasyncrelinq(sc)
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struct ppp_softc *sc;
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{
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int s;
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s = spltty();
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if (sc->sc_outm) {
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m_freem(sc->sc_outm);
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sc->sc_outm = NULL;
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}
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if (sc->sc_m) {
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m_freem(sc->sc_m);
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sc->sc_m = NULL;
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}
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if (sc->sc_flags & SC_TIMEOUT) {
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untimeout(ppp_timeout, (void *) sc, sc->sc_ch);
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sc->sc_flags &= ~SC_TIMEOUT;
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}
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splx(s);
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}
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/*
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* This gets called from the upper layer to notify a mtu change
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*/
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static void
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pppasyncsetmtu(sc)
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register struct ppp_softc *sc;
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{
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register struct tty *tp = (struct tty *) sc->sc_devp;
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int s;
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s = spltty();
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if (tp != NULL)
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clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
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sc->sc_if.if_mtu + PPP_HIWAT);
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splx(s);
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}
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/*
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* Line specific (tty) read routine.
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* called at zero spl from the device driver in the response to user-level
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* reads on the tty file descriptor (ie: pppd).
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*/
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static int
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pppread(tp, uio, flag)
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register struct tty *tp;
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struct uio *uio;
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int flag;
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{
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register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
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struct mbuf *m, *m0;
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register int s;
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int error = 0;
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if (sc == NULL)
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return 0;
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/*
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* Loop waiting for input, checking that nothing disasterous
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* happens in the meantime.
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*/
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s = spltty();
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for (;;) {
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if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
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splx(s);
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return 0;
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}
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if (sc->sc_inq.ifq_head != NULL)
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break;
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if ((tp->t_state & TS_CONNECTED) == 0) {
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splx(s);
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return 0; /* end of file */
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}
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if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
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splx(s);
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return (EWOULDBLOCK);
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}
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error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, "pppin", 0);
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if (error) {
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splx(s);
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return error;
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}
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}
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/* Pull place-holder byte out of canonical queue */
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getc(&tp->t_canq);
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/* Get the packet from the input queue */
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IF_DEQUEUE(&sc->sc_inq, m0);
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splx(s);
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for (m = m0; m && uio->uio_resid; m = m->m_next)
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if ((error = uiomove(mtod(m, u_char *), m->m_len, uio)) != 0)
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break;
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m_freem(m0);
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return (error);
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}
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/*
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* Line specific (tty) write routine.
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* called at zero spl from the device driver in the response to user-level
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* writes on the tty file descriptor (ie: pppd).
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*/
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static int
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pppwrite(tp, uio, flag)
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register struct tty *tp;
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struct uio *uio;
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int flag;
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{
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register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
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struct mbuf *m, *m0, **mp;
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struct sockaddr dst;
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int len, error, s;
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if ((tp->t_state & TS_CONNECTED) == 0)
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return 0; /* wrote 0 bytes */
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if (tp->t_line != PPPDISC)
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return (EINVAL);
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if (sc == NULL || tp != (struct tty *) sc->sc_devp)
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return EIO;
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if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
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uio->uio_resid < PPP_HDRLEN)
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return (EMSGSIZE);
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s = spltty();
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for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
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MGET(m, M_TRYWAIT, MT_DATA);
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if ((*mp = m) == NULL) {
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m_freem(m0);
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splx(s);
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return (ENOBUFS);
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}
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m->m_len = 0;
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if (uio->uio_resid >= MCLBYTES / 2)
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MCLGET(m, M_DONTWAIT);
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len = M_TRAILINGSPACE(m);
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if (len > uio->uio_resid)
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len = uio->uio_resid;
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if ((error = uiomove(mtod(m, u_char *), len, uio)) != 0) {
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m_freem(m0);
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splx(s);
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return (error);
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}
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m->m_len = len;
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}
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dst.sa_family = AF_UNSPEC;
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bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
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m0->m_data += PPP_HDRLEN;
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m0->m_len -= PPP_HDRLEN;
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/* call the upper layer to "transmit" it... */
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error = pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0);
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splx(s);
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return (error);
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}
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/*
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* Line specific (tty) ioctl routine.
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* This discipline requires that tty device drivers call
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* the line specific l_ioctl routine from their ioctl routines.
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*/
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/* ARGSUSED */
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static int
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ppptioctl(tp, cmd, data, flag, td)
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struct tty *tp;
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u_long cmd;
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caddr_t data;
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int flag;
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struct thread *td;
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{
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struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
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int error, s;
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if (sc == NULL || tp != (struct tty *) sc->sc_devp)
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return (ENOIOCTL);
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error = 0;
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switch (cmd) {
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case PPPIOCSASYNCMAP:
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if ((error = suser(td)) != 0)
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break;
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sc->sc_asyncmap[0] = *(u_int *)data;
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break;
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case PPPIOCGASYNCMAP:
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*(u_int *)data = sc->sc_asyncmap[0];
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break;
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case PPPIOCSRASYNCMAP:
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if ((error = suser(td)) != 0)
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break;
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sc->sc_rasyncmap = *(u_int *)data;
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break;
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case PPPIOCGRASYNCMAP:
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*(u_int *)data = sc->sc_rasyncmap;
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break;
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case PPPIOCSXASYNCMAP:
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if ((error = suser(td)) != 0)
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break;
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s = spltty();
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bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
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sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */
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sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */
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sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */
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splx(s);
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break;
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case PPPIOCGXASYNCMAP:
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bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
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break;
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default:
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error = pppioctl(sc, cmd, data, flag, td);
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if (error == 0 && cmd == PPPIOCSMRU)
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pppgetm(sc);
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}
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return error;
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}
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|
|
|
/*
|
|
* 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(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.
|
|
*/
|
|
static void
|
|
pppasyncstart(sc)
|
|
register struct ppp_softc *sc;
|
|
{
|
|
register struct tty *tp = (struct tty *) sc->sc_devp;
|
|
register struct mbuf *m;
|
|
register int len;
|
|
register u_char *start, *stop, *cp;
|
|
int n, ndone, done, idle;
|
|
int s;
|
|
|
|
idle = 0;
|
|
/* XXX assumes atomic access to *tp although we're not at spltty(). */
|
|
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.
|
|
*/
|
|
/* XXX as above. */
|
|
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);
|
|
getmicrotime(&sc->sc_if.if_lastchange);
|
|
}
|
|
|
|
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) {
|
|
s = spltty();
|
|
if (putc(PPP_ESCAPE, &tp->t_outq)) {
|
|
splx(s);
|
|
break;
|
|
}
|
|
if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
|
|
(void) unputc(&tp->t_outq);
|
|
splx(s);
|
|
break;
|
|
}
|
|
splx(s);
|
|
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.
|
|
*/
|
|
s = spltty();
|
|
for (q = endseq; q < p; ++q)
|
|
if (putc(*q, &tp->t_outq)) {
|
|
done = 0;
|
|
for (; q > endseq; --q)
|
|
unputc(&tp->t_outq);
|
|
break;
|
|
}
|
|
splx(s);
|
|
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. */
|
|
m = m_free(m);
|
|
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. */
|
|
s = spltty();
|
|
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) {
|
|
sc->sc_ch = timeout(ppp_timeout, (void *) sc, 1);
|
|
sc->sc_flags |= SC_TIMEOUT;
|
|
}
|
|
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* This gets called when a received packet is placed on
|
|
* the inq, at splsoftnet. The pppd daemon is to be woken up to do a read().
|
|
*/
|
|
static void
|
|
pppasyncctlp(sc)
|
|
struct ppp_softc *sc;
|
|
{
|
|
struct tty *tp;
|
|
int s;
|
|
|
|
/* Put a placeholder byte in canq for ttselect()/ttnread(). */
|
|
s = spltty();
|
|
tp = (struct tty *) sc->sc_devp;
|
|
putc(0, &tp->t_canq);
|
|
ttwakeup(tp);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* 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(tp)
|
|
register struct tty *tp;
|
|
{
|
|
register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
|
|
|
|
/*
|
|
* 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 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
|
|
&& !((tp->t_state & TS_CONNECTED) == 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(x)
|
|
void *x;
|
|
{
|
|
struct ppp_softc *sc = (struct ppp_softc *) x;
|
|
struct tty *tp = (struct tty *) sc->sc_devp;
|
|
int s;
|
|
|
|
s = spltty();
|
|
sc->sc_flags &= ~SC_TIMEOUT;
|
|
pppstart(tp);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Allocate enough mbuf to handle current MRU.
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* tty interface receiver interrupt.
|
|
*/
|
|
static unsigned paritytab[8] = {
|
|
0x96696996, 0x69969669, 0x69969669, 0x96696996,
|
|
0x69969669, 0x96696996, 0x96696996, 0x69969669
|
|
};
|
|
|
|
/*
|
|
* Called when character is available from device driver.
|
|
* Only guaranteed to be at splsofttty() or spltty()
|
|
* This is safe to be called while the upper half's netisr is preempted.
|
|
*/
|
|
static int
|
|
pppinput(c, tp)
|
|
int c;
|
|
register struct tty *tp;
|
|
{
|
|
register struct ppp_softc *sc;
|
|
struct mbuf *m;
|
|
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 ((tp->t_state & TS_CONNECTED) == 0) {
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "no carrier\n");
|
|
goto flush;
|
|
}
|
|
|
|
if (c & TTY_ERRORMASK) {
|
|
/* framing error or overrun on this char - abort packet */
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "line error %x\n", c & TTY_ERRORMASK);
|
|
goto flush;
|
|
}
|
|
|
|
c &= TTY_CHARMASK;
|
|
|
|
/*
|
|
* Handle software flow control of output.
|
|
*/
|
|
if (tp->t_iflag & IXON) {
|
|
if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
|
|
if ((tp->t_state & TS_TTSTOP) == 0) {
|
|
tp->t_state |= TS_TTSTOP;
|
|
tp->t_stop(tp, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
if (tp->t_oproc != NULL)
|
|
(*tp->t_oproc)(tp);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
s = spltty();
|
|
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;
|
|
splx(s);
|
|
|
|
if (sc->sc_flags & SC_LOG_RAWIN)
|
|
ppplogchar(sc, c);
|
|
|
|
if (c == PPP_FLAG) {
|
|
ilen = sc->sc_ilen;
|
|
sc->sc_ilen = 0;
|
|
|
|
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)) {
|
|
s = spltty();
|
|
sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
|
|
if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "bad fcs %x, pkt len %d\n",
|
|
sc->sc_fcs, ilen);
|
|
sc->sc_if.if_ierrors++;
|
|
sc->sc_stats.ppp_ierrors++;
|
|
} else
|
|
sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
|
|
if (ilen) {
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "too short (%d)\n", ilen);
|
|
s = spltty();
|
|
sc->sc_if.if_ierrors++;
|
|
sc->sc_stats.ppp_ierrors++;
|
|
sc->sc_flags |= SC_PKTLOST;
|
|
splx(s);
|
|
}
|
|
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 */
|
|
m = sc->sc_m;
|
|
sc->sc_m = sc->sc_mc->m_next;
|
|
sc->sc_mc->m_next = NULL;
|
|
|
|
ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
|
|
if (sc->sc_flags & SC_PKTLOST) {
|
|
s = spltty();
|
|
sc->sc_flags &= ~SC_PKTLOST;
|
|
splx(s);
|
|
}
|
|
|
|
pppgetm(sc);
|
|
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;
|
|
|
|
s = spltty();
|
|
if (sc->sc_flags & SC_ESCAPED) {
|
|
sc->sc_flags &= ~SC_ESCAPED;
|
|
c ^= PPP_TRANS;
|
|
} else if (c == PPP_ESCAPE) {
|
|
sc->sc_flags |= SC_ESCAPED;
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
splx(s);
|
|
|
|
/*
|
|
* 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 */
|
|
if (sc->sc_m == NULL) {
|
|
pppgetm(sc);
|
|
if (sc->sc_m == NULL) {
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "no input mbufs!\n");
|
|
goto flush;
|
|
}
|
|
}
|
|
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) {
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if,
|
|
"garbage received: 0x%x (need 0xFF)\n", 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)
|
|
if_printf(&sc->sc_if, "missing UI (0x3), got 0x%x\n", 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)
|
|
if_printf(&sc->sc_if, "bad protocol %x\n",
|
|
(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)
|
|
if_printf(&sc->sc_if, "packet too big\n");
|
|
goto flush;
|
|
}
|
|
|
|
/* is this mbuf full? */
|
|
m = sc->sc_mc;
|
|
if (M_TRAILINGSPACE(m) <= 0) {
|
|
if (m->m_next == NULL) {
|
|
pppgetm(sc);
|
|
if (m->m_next == NULL) {
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
if_printf(&sc->sc_if, "too few input mbufs!\n");
|
|
goto flush;
|
|
}
|
|
}
|
|
sc->sc_mc = m = m->m_next;
|
|
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)) {
|
|
s = spltty();
|
|
sc->sc_if.if_ierrors++;
|
|
sc->sc_stats.ppp_ierrors++;
|
|
sc->sc_flags |= SC_FLUSH;
|
|
splx(s);
|
|
if (sc->sc_flags & SC_LOG_FLUSH)
|
|
ppplogchar(sc, c);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#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("%s input: %*D", sc->sc_if.if_xname,
|
|
sc->sc_rawin_count, sc->sc_rawin, " ");
|
|
sc->sc_rawin_count = 0;
|
|
}
|
|
}
|