/* if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver *//* Copyright 1996 - 2003 Wind River Systems, Inc. */#include "copyright_wrs.h"/*	$NetBSD: if_ppp.c,v 1.20 1994/10/30 21:48:52 cgd Exp $	*//* * 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). *//* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp *//*modification history--------------------01z,13jan03,rae  Merged from velocecp branch01y,20may02,vvv  modified receive mechanism to use ipintr without queueing01x,28mar02,jmp  Increased again read buffer size for solaris simulator and		 added global variable simPppRBufSize to make this buffer		 size increasable from solaris's bsp (SPR #74733).01w,17sep01,jmp  Increased read buffer size for solaris simulator (SPR                 #34025).01v,06feb01,ijm  Fix for SPR# 62196: pppDelete should not delete ppp_wrt_task		 while it holds the semaphore that tNetTask needs to run.01u,17oct00,spm  updated for new if_attach: reports memory allocation failures01t,16apr99,koz  Fix for 25165, communications error handling01s,17feb99,sgv  Fix for spr 23702, pppintr check for NULL ppp_softc01r,17feb99,sgv  Fix for spr 24459. pppalloc was not setting the correct		 ppp_softc structure to NULL on error condition01q.10sep98,sgv  Added fix for interoperating with Windows01p,18aug97,jmb  Add code to discard packets at interrupt level due		 to overflow of input ring buffer.01o,30dec97,sgv  fixed problem in PPP output Hooks01n,26sep97,sgv  Added PPP output Hooks01m,19sep97,vin  changed m_ext.ext_buf to m_extBuf and m_ext.ext_size to		 m_extSize01l,14nov96,vin  upgraded to use new buffering scheme.01k,13aug96,vin  upgraded to BSD4.4, removed call in_ifaddr_remove as it is 		 being done in if_dettach. 01j,30jul95,dzb  cleanup on errors while openning serial device.01i,05jul95,dzb  close out serial fd on errors in pppalloc().01h,12jun95,dzb  added SNMP MIBII support (counters and ioctl).                 header file consolidation.01g,24apr95,dzb  removed in_ifaddr_remove() because added to in.c (SPR #4109).01f,09mar95,dzb  added counters for ip packets sent/received.01e,06mar95,dzb  changed cfree() to free() (ANSI).01d,09feb95,dab  added SIOCGIFMTU command to ppptioctl().01c,07feb95,dzb  changed pppoutput() to return errno, instead of ERROR.                 removed redundant mbuf check from ppp_wrt_flush().		 zeroed out m_len after MGET (SPR #4037).01b,16jan95,dzb  warnings cleanup.  moved global prototypes to if_ppp.h.01a,21dec94,dab  VxWorks port - first WRS version.           +dzb  added: path for ppp header files, WRS copyright.*/#include "vxWorks.h"#include "net/mbuf.h"#include "sockLib.h"#include "ioctl.h"#include "stdio.h"#include "errnoLib.h"#include "ioLib.h"#include "iosLib.h"#include "semLib.h"#include "memLib.h"#include "taskLib.h"#include "signal.h"#include "sigLib.h"#include "etherLib.h"#include "netLib.h"#include "m2Lib.h"#include "private/m2LibP.h"#include "net/if.h"#include "net/unixLib.h"#include "net/route.h"#include "netinet/in.h"#include "netinet/in_systm.h"#include "netinet/in_var.h"#include "netinet/ip.h"#include "netinet/ip_var.h"#include "pppLib.h"#include "rngLib.h"#include "tyLib.h"#include "tickLib.h"#include "memPartLib.h"#if NPPP > 0#ifdef VJC#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#define PPP_HIWAT       400     /* Don't start a new packet if HIWAT on que *//* external variables */IMPORT void if_dettach();IMPORT void if_down();/* global variables */struct ppp_softc *ppp_softc[NPPP] = { 0 } ;int ppp_wrt_task_priority    	= 60;int ppp_wrt_task_options     	= VX_SUPERVISOR_MODE | VX_UNBREAKABLE;int ppp_wrt_task_stack_size   	= 0x4000;char *ppp_device_name		= "ppp";#if	(CPU_FAMILY==SIMSPARCSOLARIS)int simPppRBufSize = 48 * PPP_MTU;	/* size of PPP read ring buffer */#endifstatic int pppioctl __ARGS((struct ifnet *, int , caddr_t));static int pppattach __ARGS((int));static int pppoutput __ARGS((struct ifnet *, struct mbuf *, struct sockaddr *,			     struct rtentry *));static void pppinput __ARGS((struct ppp_softc *, int));static int pppasyncstart __ARGS((struct ppp_softc *));static u_short pppfcs __ARGS((int, u_char *, int));static int pppgetm __ARGS((struct ppp_softc *sc));static void pppdumpm __ARGS((struct mbuf *, int));static void pppdumpb __ARGS((u_char *, int));static void ppplogchar __ARGS((struct ppp_softc *, int));static void pppdealloc __ARGS((struct ppp_softc *));static struct ppp_softc *pppalloc __ARGS((int, char *));static void ppp_wrt_flush __ARGS((struct ppp_softc *));static void pinit __ARGS((int));static int pppintr __ARGS((int, int));static void ppp_tty_read __ARGS((int, struct ppp_softc *, int));/* * Some useful mbuf macros not in mbuf.h. */#define M_DATASTART(m)	(m)->m_extBuf#define M_DATASIZE(m)	(m)->m_extSize#define PPPBUFSIZE        (PPP_MTU * 2)/* * 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 to establish ppp interfaces. */static intpppattach(unit)    int unit;{    register struct ppp_softc *sc;    int status;    sc = ppp_softc[unit];#ifdef VIRTUAL_STACK    virtualStackIdCheck();  /* make sure the myStackNum exists */    sc->sc_if.vsNum = myStackNum;#endif /* VIRTUAL_STACK */    sc->sc_if.if_name = "ppp";    sc->sc_if.if_unit = unit;    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;    sc->sc_if.if_reset = pppclose;    sc->sc_if.if_init = (FUNCPTR) pinit;    status = if_attach(&sc->sc_if);    return (status);}/* * Allocate a ppp interface unit and initialize it. */static struct ppp_softc *pppalloc(unit, device)    int unit;    char *device;{    struct ppp_softc *sc;    if (ppp_softc[unit] != NULL)        return NULL;    if ((sc = (struct ppp_softc *) KHEAP_ALLOC(sizeof(struct ppp_softc))) == NULL)        return (NULL);    bzero ((char *)sc, sizeof (struct ppp_softc));    ppp_softc[unit] = sc;    if ((sc->sc_fd = open(device, O_RDWR, 0)) == ERROR)        {        ppp_softc[unit] = (struct ppp_softc *)NULL;        KHEAP_FREE((char *)sc);        return NULL;	}#if	(CPU_FAMILY==SIMSPARCSOLARIS)    /*     * For PPP on solaris simulator, the receive buffer size must be more     * important. This is necessary because the solaris host can send several      * several PPP packets to the simulator before he is able to     * handle them (don't forget that they share the same CPU).     * If the receive buffer size is too small to store all the received     * characters, some of them may be lost. The new value has been chosen     * after some testing (with this value, the simulator has time to     * handle packets before the receive buffer is full) but may not be     * sufficient in all cases, if not sufficient simPppRBufSize can be     * increased in sysLib.c.     */    if (ioctl(sc->sc_fd, FIORBUFSET, simPppRBufSize) == ERROR ||#else	/* CPU_FAMILY==SIMSPARCSOLARIS */    if (ioctl(sc->sc_fd, FIORBUFSET, 4 * PPP_MTU) == ERROR ||#endif        ioctl(sc->sc_fd, FIOWBUFSET, 4 * PPP_MTU) == ERROR) {        close(sc->sc_fd);        ppp_softc[unit] = (struct ppp_softc *)NULL;        KHEAP_FREE((char *)sc);        return NULL;    }    if (pppattach(unit) == ERROR) {         close(sc->sc_fd);        ppp_softc[unit] = (struct ppp_softc *)NULL;        KHEAP_FREE((char *) sc);        return (NULL);    }    if (ioctl(sc->sc_fd, FIOPROTOHOOK, (int)pppintr) == ERROR ||        ioctl(sc->sc_fd, FIOPROTOARG, unit) == ERROR) {        close(sc->sc_fd);        pppdealloc(sc);        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. */static voidpppdealloc(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);    if_dettach(&sc->sc_if);    ppp_softc[sc->sc_if.if_unit] = (struct ppp_softc *)NULL;    semDelete (sc->sc_wrtsem);    KHEAP_FREE((char *)sc);}/* * pppopen - open the ppp interface. * 	     Returns unit id. */intpppopen(unit, device)    int unit;    char *device;{    register struct ppp_softc *sc;    char ppp_wrt_name[10];    if ((sc = pppalloc(unit, device)) == NULL)        return (ERROR);    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 (ERROR);    }    sc->sc_ilen  = 0;    bzero((char *)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 *) NULL;    sc->sc_start = pppasyncstart;    sc->sc_qlen  = 0;    sc->sc_tid = taskIdSelf();    sc->sc_wrtsem = semBCreate (SEM_Q_PRIORITY, SEM_EMPTY);    ioctl(sc->sc_fd, FIOFLUSH, 0);    sprintf(ppp_wrt_name, "tPPP%dWrt", sc->sc_if.if_unit);    sc->sc_wrt_task_id = taskSpawn (ppp_wrt_name, ppp_wrt_task_priority,				    ppp_wrt_task_options, ppp_wrt_task_stack_size,				    (FUNCPTR)ppp_wrt_task, (int)sc,				    0, 0, 0, 0, 0, 0, 0, 0, 0);    if (sc->sc_wrt_task_id == ERROR) {        close(sc->sc_fd);        pppdealloc(sc);        return (ERROR);    }    return (OK);}    /* * Line specific close routine. * Detach the tty from the ppp unit. * Mimics part of ttyclose(). */intpppclose(unit)    int unit;{    register struct ppp_softc *sc;    int s;    if (unit >= 0 && unit < NPPP)        sc = ppp_softc[unit];    else        return (ERROR);    if (sc != NULL) {	ppp_wrt_flush(sc);        ioctl(sc->sc_fd, FIOPROTOHOOK, (int) NULL);        taskDelete(sc->sc_wrt_task_id);        s = splimp();		/* paranoid; splnet probably ok */        close(sc->sc_fd);        m_freem(sc->sc_outm);        sc->sc_outm = NULL;        m_freem(sc->sc_m);        sc->sc_m = NULL;        pppdealloc(sc);        splx(s);    }    else        return (ERROR);    return(OK);}/* * Line specific (tty) read routine. */intpppread(unit, buf, count)    int unit;    char *buf;    int count;{    register struct ppp_softc *sc = ppp_softc[unit];    struct mbuf *m;    register int s;    s = splimp();    IF_DEQUEUE(&sc->sc_inq, m);    splx(s);    if (m == NULL)	return 0;