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ppp.c
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C/C++ Source or Header
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1994-04-17
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/*
* PPP.C -- Send and receive datagrams on serial lines with
* Point-to-Point Protocol
*
* This implementation of PPP is declared to be in the public domain.
*
* Based (in part) upon previous implementations by:
* 1989 -- Drew Daniel Perkins (ddp@andrew.cmu.edu)
* Carnegie Mellon University
* 09-90 -- Katie Stevens (dkstevens@ucdavis.edu)
* UC Davis, Computing Services
*
* Jan 91 Bill_Simpson@um.cc.umich.edu
* Computer Systems Consulting Services
*
* Feb 91 Glenn McGregor (ghm@merit.edu)
* Testing and suggestions.
*
* May 91 Bill Simpson & Glenn McGregor
* Update to newest LCP and IPCP draft RFCs.
* Add quick installation features.
* Add support for echo and discard message sending.
*
* Jul 91 Glenn McGregor & Bill Simpson
* Improve PAP user interface and fix related bugs.
* Remove pwaits and "phase machine".
*/
#include "global.h"
#ifdef PPP
#include "mbuf.h"
#include "proc.h"
#include "iface.h"
#include "internet.h"
#include "ip.h"
#include "slhc.h"
#ifdef LINUX
#include "lxasy.h"
#else
#include "i8250.h"
#endif
#include "asy.h"
#include "pktdrvr.h"
#include "socket.h"
#include "devparam.h"
#include "ppp.h"
#include "pppfsm.h"
#include "ppplcp.h"
#include "ppppap.h"
#include "pppipcp.h"
#include "trace.h"
/* Routines local to this file */
static struct mbuf *htonppp __ARGS((struct ppp_hdr *ppp, struct mbuf *data));
static void ppp_log __ARGS((struct ppp_s *ppp_p, char *comment));
static void ppp_error __ARGS((struct ppp_s *ppp_p, struct mbuf *bp, char *comment));
static void ppp_skipped __ARGS((struct ppp_s *ppp_p, struct mbuf *bp, char *comment));
static int ppp_raw __ARGS((struct iface *ifp, struct mbuf *data));
static void ppp_recv __ARGS((int dev, void *p1, void *p2));
static int ppp_iostatus __ARGS((struct iface *ifp, int command, int32 value));
static int ppp_discard __ARGS((struct iface *ifp, struct mbuf *bp));
static int ppp_echo __ARGS((struct iface *ifp, struct mbuf *bp));
/*
* FCS lookup table as generated by fcsgen.c
*/
int16 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
};
#define pppfcs(fcs, c) ((fcs >> 8) ^ fcstab[(fcs ^ c) & 0x00ff])
#define SP_CHAR 0x20
/****************************************************************************/
/* Convert PPP header in host form to network form */
static struct mbuf *
htonppp(ppp, data)
struct ppp_hdr *ppp;
struct mbuf *data;
{
struct mbuf *bp;
register char *cp;
/* Prepend header onto packet data */
if ((bp = pushdown(data, PPP_HDR_LEN)) == NULLBUF) {
free_p( data );
return NULLBUF;
}
/* Load header with proper values */
cp = bp->data;
*cp++ = ppp->addr;
*cp++ = ppp->control;
cp = put16(cp,ppp->protocol);
return bp;
}
/************************************************************************/
/* General log routine */
static void
ppp_log( ppp_p, comment )
struct ppp_s *ppp_p;
char *comment;
{
if (ppp_p->trace)
trace_log(ppp_p->iface,"%s PPP %s",
ppp_p->iface->name,
comment);
}
/* Bad packet */
static void
ppp_error(ppp_p, bp, comment)
struct ppp_s *ppp_p;
struct mbuf *bp;
char *comment;
{
free_p(bp);
ppp_log( ppp_p, comment );
}
/* Unknown type input packet */
static void
ppp_skipped(ppp_p, bp, comment)
struct ppp_s *ppp_p;
struct mbuf *bp;
char *comment;
{
struct ipcp_s *ipcp_p;
if ( (ipcp_p = ppp_p->fsm[IPcp].pdv) != NULL ) {
slhc_toss( ipcp_p->slhcp );
}
ppp_error( ppp_p, bp, comment );
}
/****************************************************************************/
/* Send IP datagram with Point-to-Point Protocol */
int
ppp_send(bp,ifp,gateway,prec,del,tput,rel)
struct mbuf *bp; /* Buffer to send */
struct iface *ifp; /* Pointer to interface control block */
int32 gateway; /* Ignored (PPP is point-to-point) */
int prec;
int del;
int tput;
int rel;
{
struct ppp_s *ppp_p;
struct ipcp_s *ipcp_p;
int protocol = PPP_IP_PROTOCOL;
if (ifp == NULLIF
|| (ppp_p = ifp->edv) == NULL) {
free_p(bp);
return -1;
}
if (ppp_p->fsm[IPcp].state != fsmOPENED) {
ppp_error( ppp_p, bp, "not open for IP traffic" );
ppp_p->OutError++;
return -1;
}
ipcp_p = ppp_p->fsm[IPcp].pdv;
if (ipcp_p->remote.work.negotiate & IPCP_N_COMPRESS) {
/* Attempt IP/TCP header compression */
switch ( slhc_compress(ipcp_p->slhcp, &bp,
ipcp_p->remote.work.slot_compress) ) {
case SL_TYPE_IP:
protocol = PPP_IP_PROTOCOL;
break;
case SL_TYPE_COMPRESSED_TCP:
protocol = PPP_COMPR_PROTOCOL;
break;
case SL_TYPE_UNCOMPRESSED_TCP:
protocol = PPP_UNCOMP_PROTOCOL;
break;
default:
ppp_error( ppp_p, bp, "bad IP packet" );
ppp_p->OutError++;
return -1;
};
}
return (*ifp->output)(ifp,NULLCHAR,NULLCHAR,protocol,bp);
}
/* Send a packet with PPP header */
int
ppp_output(ifp,dest,source,protocol,data)
struct iface *ifp; /* Pointer to interface control block */
char *dest; /* Dest addr (ignored; PPP is point-to-point) */
char *source; /* Source addr (ignored; PPP is point-to-point) */
int16 protocol; /* PPP Protocol Type field */
struct mbuf *data; /* Actual data to be sent */
{
struct ppp_s *ppp_p;
struct mbuf *bp;
struct ppp_hdr hdr;
if (ifp == NULLIF
|| (ppp_p = ifp->edv) == NULL) {
free_p(data);
return -1;
}
if (ppp_p->phase == pppDEAD) {
ppp_error( ppp_p, data, "line not up" );
ppp_p->OutError++;
return -1;
}
hdr.addr = HDLC_ALL_ADDR;
hdr.control = HDLC_UI;
hdr.protocol = protocol;
if ((bp = htonppp(&hdr, data)) == NULLBUF) {
ppp_log( ppp_p, Nospace );
ppp_p->OutMemory++;
return -1;
}
return (*ifp->raw)(ifp,bp);
}
/* Encode a raw packet in PPP framing, put on link output queue */
static int
ppp_raw(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
struct ppp_s *ppp_p = ifp->edv;
struct lcp_s *lcp_p = ppp_p->fsm[Lcp].pdv;
int full_lcp, full_ac, full_p;
int16 calc_fcs = HDLC_FCS_START;
int32 accm = LCP_ACCM_DEFAULT;
struct ppp_hdr ph;
int len = PPP_HDR_LEN;
struct mbuf *vbp;
register char *cp;
register int c;
dump(ifp,IF_TRACE_OUT,CL_PPP,bp);
ppp_p->OutTxOctetCount += len_p(bp) + 2; /* count FCS bytes */
ifp->rawsndcnt++;
ifp->lastsent = secclock();
/* Get the HDLC/PPP header, without actually pulling mbuf up */
if ( bp == NULLBUF || bp->cnt < PPP_HDR_LEN ) {
ppp_error( ppp_p, bp, "link header missing" );
ppp_p->OutError++;
return -1;
}
ph.addr = bp->data[0];
ph.control = bp->data[1];
ph.protocol = get16(&bp->data[2]);
if ( ( full_lcp = (ph.protocol == PPP_LCP_PROTOCOL) ) == 0
&& (lcp_p->remote.work.negotiate & LCP_N_ACCM) ) {
accm = lcp_p->remote.work.accm;
}
if ( ( full_p = ( full_lcp
|| !(lcp_p->remote.work.negotiate & LCP_N_PFC)
|| ph.protocol >= 0x00ff ) )
== 0 ) {
--len;
}
/* Discard HDLC address and control fields if possible */
if ( ( full_ac = ( full_lcp
|| !(lcp_p->remote.work.negotiate & LCP_N_ACFC) ) )
== 0 ) {
len -= 2;
}
/* Load header with proper values */
bp->cnt -= PPP_HDR_LEN - len;
cp = (bp->data += PPP_HDR_LEN - len);
if ( full_ac ) {
*cp++ = ph.addr;
*cp++ = ph.control;
}
if ( full_p )
*cp++ = (ph.protocol >> 8);
*cp++ = (ph.protocol & 0x00ff);
/* Allocate output mbuf that's twice as long as the packet.
* This is a worst-case guess (consider a packet full of HDLC_FLAGs!)
*/
if ((vbp = alloc_mbuf((int16)(2*len_p(bp) + HDLC_ENVLEN))) == NULLBUF) {
ppp_error( ppp_p, bp, Nospace );
ppp_p->OutMemory++;
return -1;
}
cp = vbp->data;
/* No need to send an opening flag if the previous packet is still
* being transmitted.
*/
#ifdef LINUX
if (Asy[ifp->dev].sndq == 0) {
#else
if ( Asy[ifp->dev].dma.flags == 0 ) {
#endif
/* Flush out any line garbage */
*cp++ = HDLC_FLAG;
ppp_p->OutOpenFlag++;
}
/* Copy input to output, escaping special characters */
while ((c = PULLCHAR(&bp)) != -1) {
/* Fold char value into FCS calculated so far */
calc_fcs = pppfcs(calc_fcs, c);
if ( ((c < SP_CHAR) && (accm & (1L << c)))
|| (c == HDLC_ESC_ASYNC)
|| (c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
}
/* Final FCS calculation */
calc_fcs ^= 0xffff;
c = (calc_fcs & 0x00ff); /* Least significant byte first */
if ( ((c < SP_CHAR) && (accm & (1L << c)))
||(c == HDLC_ESC_ASYNC)
||(c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
c = (calc_fcs >> 8); /* Most significant byte next */
if ( ((c < SP_CHAR) && (accm & (1L << c)))
||(c == HDLC_ESC_ASYNC)
||(c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
/* Tie off the packet */
*cp++ = HDLC_FLAG;
vbp->cnt = cp - vbp->data;
if (ifp->trace & IF_TRACE_RAW)
raw_dump(ifp,IF_TRACE_OUT,vbp);
return asy_send(ifp->dev,vbp);
}
/****************************************************************************/
/* Packetize PPP input from device */
/* (process started by ppp_init) */
void
ppp_recv(dev,p1,p2)
int dev;
void *p1;
void *p2;
{
struct iface *ifp = p1;
struct ppp_s *ppp_p = ifp->edv;
int32 accm = LCP_ACCM_DEFAULT;
int16 calc_fcs = HDLC_FCS_START;
struct mbuf *raw_bp = NULLBUF;
struct mbuf *head_bp = NULLBUF;
register struct mbuf *tail_bp = NULLBUF;
char *cp; /* next byte in tail mbuf */
register int mode = FALSE;
register int c;
while ( (c = get_asy(dev)) != -1 ) {
#ifdef PPP_DEBUG_RAW
if (ifp->trace & IF_TRACE_RAW) {
if ( raw_bp != NULLBUF
|| (raw_bp = alloc_mbuf( LCP_MRU_HI * 2 )) != NULLBUF ) {
*raw_bp->data++ = c;
raw_bp->cnt++;
if ( raw_bp->cnt != 1 && c == HDLC_FLAG ) {
raw_bp->data = (char *)(raw_bp + 1);
raw_dump( ifp, IF_TRACE_IN, raw_bp );
raw_bp->cnt = 0;
}
}
}
#endif
if ( c == HDLC_FLAG ) {
if ( mode & PPP_ESCAPED ) {
ppp_skipped( ppp_p, head_bp,
"deliberate cancellation" );
ppp_p->InFrame++;
} else if ( mode & PPP_TOSS ) {
free_p( head_bp );
} else if ( head_bp != NULLBUF ) {
if ( calc_fcs != HDLC_FCS_FINAL ) {
ppp_skipped( ppp_p, head_bp,
"checksum error" );
ppp_p->InChecksum++;
} else {
/* trim off FCS bytes */
trim_mbuf(&head_bp, len_p(head_bp)-2);
net_route( ifp, CL_PPP, head_bp );
}
} else {
ppp_p->InOpenFlag++;
}
/* setup for next buffer */
mode = FALSE;
head_bp = tail_bp = NULLBUF;
calc_fcs = HDLC_FCS_START;
accm = LCP_ACCM_DEFAULT;
/* Use negotiated values if LCP finished */
if (ppp_p->fsm[Lcp].state == fsmOPENED) {
struct lcp_s *lcp_p = ppp_p->fsm[Lcp].pdv;
if (lcp_p->local.work.negotiate & LCP_N_ACCM) {
accm = lcp_p->local.work.accm;
}
}
#ifdef PPP_DEBUG_RAW
if (!(ifp->trace & IF_TRACE_RAW)) {
if ( raw_bp != NULLBUF ) {
free_p( raw_bp );
raw_bp = NULLBUF;
}
}
#endif
continue;
}
/* We reach here for every byte inside a frame.
* (The order of the following tests is important.)
* Discard spurious control characters.
* Check for escape sequence.
* (Allow escaped escape.)
*/
if ( c < SP_CHAR && (accm & (1L << c)) ) {
continue;
} else if ( mode & PPP_ESCAPED ) {
mode &= ~PPP_ESCAPED;
c ^= HDLC_ESC_COMPL;
} else if ( c == HDLC_ESC_ASYNC ) {
mode |= PPP_ESCAPED;
continue;
}
/* We reach here with a byte for the buffer.
* Make sure there is room for it.
*/
if ( tail_bp == NULLBUF ) {
if ((tail_bp = alloc_mbuf(PPP_ALLOC)) == NULLBUF) {
ppp_skipped( ppp_p, tail_bp, Nospace );
ppp_p->InMemory++;
mode |= PPP_TOSS;
continue;
}
head_bp = tail_bp;
cp = tail_bp->data;
} else if ( tail_bp->cnt >= tail_bp->size ) {
/* Current mbuf is full */
if ( (tail_bp->next = alloc_mbuf(PPP_ALLOC)) == NULLBUF ) {
/* No memory, drop the whole packet */
ppp_skipped( ppp_p, head_bp, Nospace );
ppp_p->InMemory++;
head_bp = NULLBUF;
mode |= PPP_TOSS;
continue;
}
tail_bp = tail_bp->next;
cp = tail_bp->data;
}
/* Store the byte, increment counts */
*cp++ = c;
tail_bp->cnt++;
calc_fcs = pppfcs(calc_fcs, c);
}
/* clean up afterward */
free_p(raw_bp);
free_p(head_bp);
ifp->rxproc = NULLPROC;
}
#ifdef TURBOC_SWITCH_BUG
#pragma option -G-
#endif
/* Process incoming PPP packets */
/* (called from network task) */
void
ppp_proc(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
struct ppp_s *ppp_p;
struct ipcp_s *ipcp_p;
struct ppp_hdr ph;
struct mbuf *hbp;
int16 negotiated = FALSE;
if ( ifp == NULLIF ) {
log(-1, "ppp_proc: missing iface" );
return;
}
if ( bp == NULLBUF ) {
trace_log(ifp, "ppp_proc: missing buffer" );
return;
}
ppp_p = ifp->edv;
ppp_p->InRxOctetCount += len_p(bp) + 2; /* count FCS bytes */
/* Use negotiated values if LCP finished */
if (ppp_p->fsm[Lcp].state == fsmOPENED) {
struct lcp_s *lcp_p = ppp_p->fsm[Lcp].pdv;
negotiated = lcp_p->local.work.negotiate;
}
/* HDLC address and control fields may be compressed out */
if ((byte_t)bp->data[0] != HDLC_ALL_ADDR) {
if (!(negotiated & LCP_N_ACFC)) {
ppp_skipped( ppp_p, bp, "missing ALL address" );
ppp_p->InFrame++;
return;
}
} else if ((byte_t)bp->data[1] != HDLC_UI) {
if (!(negotiated & LCP_N_ACFC)
|| !(negotiated & LCP_N_PFC)) {
ppp_skipped( ppp_p, bp, "missing UI" );
ppp_p->InFrame++;
return;
}
} else {
/* skip address/control fields */
pull16(&bp);
}
/* Initialize the expected header */
ph.addr = HDLC_ALL_ADDR;
ph.control = HDLC_UI;
ph.protocol = PULLCHAR(&bp);
/* First byte of PPP protocol field may be compressed out */
if ( ph.protocol & 0x01 ) {
if (!(negotiated & LCP_N_PFC)) {
ppp_skipped( ppp_p, bp, "missing upper protocol byte" );
ppp_p->InFrame++;
return;
}
} else {
ph.protocol = (ph.protocol << 8) | PULLCHAR(&bp);
/* Second byte of PPP protocol field must be odd */
if ( !(ph.protocol & 0x01) ) {
ppp_skipped( ppp_p, bp, "missing lower protocol byte" );
ppp_p->InFrame++;
return;
}
}
switch(ph.protocol) {
case PPP_IP_PROTOCOL: /* Regular IP */
if ( ppp_p->fsm[IPcp].state != fsmOPENED ) {
ppp_error( ppp_p, bp, "not open for IP traffic" );
ppp_p->InError++;
break;
}
ip_route(ifp,bp,0);
break;
case PPP_COMPR_PROTOCOL: /* Van Jacobson Compressed TCP/IP */
if ( ppp_p->fsm[IPcp].state != fsmOPENED ) {
ppp_skipped( ppp_p, bp, "not open for Compressed TCP/IP traffic" );
ppp_p->InError++;
break;
}
ipcp_p = ppp_p->fsm[IPcp].pdv;
if (!(ipcp_p->local.work.negotiate & IPCP_N_COMPRESS)) {
ppp_skipped( ppp_p, bp, "Compressed TCP/IP not enabled" );
ppp_p->InError++;
break;
}
if ( slhc_uncompress(ipcp_p->slhcp, &bp) <= 0 ) {
ppp_error( ppp_p, bp, "Compressed TCP/IP packet error" );
ppp_p->InError++;
break;
}
ip_route(ifp,bp,0);
break;
case PPP_UNCOMP_PROTOCOL: /* Van Jacobson Uncompressed TCP/IP */
if ( ppp_p->fsm[IPcp].state != fsmOPENED ) {
ppp_skipped( ppp_p, bp, "not open for Uncompressed TCP/IP traffic" );
ppp_p->InError++;
break;
}
ipcp_p = ppp_p->fsm[IPcp].pdv;
if (!(ipcp_p->local.work.negotiate & IPCP_N_COMPRESS)) {
ppp_skipped( ppp_p, bp, "Uncompressed TCP/IP not enabled" );
ppp_p->InError++;
break;
}
if ( slhc_remember(ipcp_p->slhcp, &bp) <= 0 ) {
ppp_error( ppp_p, bp, "Uncompressed TCP/IP packet error" );
ppp_p->InError++;
break;
}
ip_route(ifp,bp,0);
break;
case PPP_LCP_PROTOCOL: /* Link Control Protocol */
ppp_p->InNCP[Lcp]++;
fsm_proc(&(ppp_p->fsm[Lcp]),bp);
break;
case PPP_PAP_PROTOCOL: /* Password Authenticate Protocol */
if (ppp_p->phase != pppAP
&& ppp_p->phase != pppREADY) {
ppp_error( ppp_p, bp, "not ready for Authentication" );
ppp_p->InError++;
break;
}
ppp_p->InNCP[Pap]++;
pap_proc(&(ppp_p->fsm[Pap]),bp);
break;
case PPP_IPCP_PROTOCOL: /* IP Control Protocol */
if (ppp_p->phase != pppREADY) {
ppp_error( ppp_p, bp, "not ready for IPCP traffic" );
ppp_p->InError++;
break;
}
ppp_p->InNCP[IPcp]++;
fsm_proc(&(ppp_p->fsm[IPcp]),bp);
break;
default:
if ( ppp_p->trace )
trace_log(ppp_p->iface, "%s PPP Unknown packet protocol: %x;",
ppp_p->iface->name,
ph.protocol);
ppp_p->InUnknown++;
/* Build Protocol Reject packet:
* put the header back on ...
*/
if ((hbp = htonppp(&ph,bp)) == NULLBUF){
ppp_log( ppp_p, Nospace );
ppp_p->InMemory++;
return;
}
/* ... then pull off the address and control fields ... */
pull16(&hbp);
/* ... and send it as an LCP packet */
fsm_send( &(ppp_p->fsm[Lcp]), PROT_REJ, 0, hbp );
break;
};
}
#ifdef TURBOC_SWITCH_BUG
#pragma option -G
#endif
/************************************************************************/
/* Keep track of changes in I-O status */
/* (called through iface iostatus vector) */
static int
ppp_iostatus( ifp, command, value )
struct iface *ifp;
int command;
int32 value;
{
struct ppp_s *ppp_p = ifp->edv;
switch ( command ) {
case PARAM_UP:
ppp_log( ppp_p, "Physical layer up" );
if ( ppp_p->phase == pppDEAD ) {
ppp_p->phase = pppLCP;
}
fsm_start( &(ppp_p->fsm[Lcp]) );
return 0;
case PARAM_DOWN:
ppp_log( ppp_p, "Physical layer down" );
fsm_down( &(ppp_p->fsm[Lcp]) );
ppp_p->phase = pppDEAD;
return 0;
};
return -1;
}
static int
ppp_discard(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
struct ppp_s *ppp_p = ifp->edv;
return fsm_send(&(ppp_p->fsm[Lcp]), DISCARD_REQ, 0, bp);
}
static int
ppp_echo(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
struct ppp_s *ppp_p = ifp->edv;
return fsm_send(&(ppp_p->fsm[Lcp]), ECHO_REQ, 0, bp);
}
/****************************************************************************/
/* Initialize PPP control structures for a Point-to-Point interface */
int
ppp_init(ifp)
struct iface *ifp;
{
struct ppp_s *ppp_p;
char *ifn;
ppp_p = callocw(1,sizeof(struct ppp_s));
ifp->edv = ppp_p;
ifp->iostatus = ppp_iostatus;
ifp->raw = ppp_raw;
ifp->show = ppp_show;
ifp->echo = ppp_echo;
ifp->discard = ppp_discard;
ppp_p->iface = ifp;
ppp_p->phase = pppDEAD;
lcp_init(ppp_p);
pap_init(ppp_p);
ipcp_init(ppp_p);
ifp->rxproc = newproc( ifn = if_name( ifp, " receive" ),
320, ppp_recv, ifp->dev, ifp, NULL, 0);
free(ifn);
return 0;
}
int
ppp_free(ifp)
struct iface *ifp;
{
struct ppp_s *ppp_p = ifp->edv;
int fsmi;
alert( ifp->rxproc, -1 );
for ( fsmi = Lcp; fsmi < fsmi_Size; ) {
fsm_free( &(ppp_p->fsm[fsmi++]) );
}
free( ppp_p->peername );
free( ppp_p );
return 0;
}
#endif /* PPP */