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ppp.c
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1991-01-26
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/*
* PPP.C -- Send and receive datagrams on serial lines with
* Point-to-Point Protocol
*
* 12-89 -- Katie Stevens (dkstevens@ucdavis.edu)
* UC Davis, Computing Services
* PPP.08 05-90 [ks] include PPP protocol fields for VJ TCP compression
* PPP.09 05-90 [ks] add UPAP negotiation and processing
* PPP.10 07-90 [ks] make ppp open/close/reset work properly
* PPP.14 08-90 [ks] change UPAP to PAP for consistency with RFC1172
* add RLSD link up/down signal handling
* add autobaud link speed message handling
* bit-shift constants must be explicitly long if shifted more than 8 bits
* must use unsigned char for comparison with SP_CHAR
* PPP.15 09-90 [ks] update to KA9Q NOS v900828
* framing routines revamped for speed - KA9Q 1/15/91
*/
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "proc.h"
#include "iface.h"
#include "ax25.h"
#include "slcompre.h"
#include "ppp.h"
#include "slip.h"
#include "asy.h"
#include "internet.h"
#include "ip.h"
#include "config.h"
#include "trace.h"
/*#include "pktdrvr.h"*/
/*#include "trace.h"*/
/* In pppcmd.c */
extern int Ppptrace;
/* Counter for PPP id field */
unsigned char Pppid;
/* Routines local to this file */
static struct mbuf *htonppp __ARGS((struct ppphdr *ppp, struct mbuf *data,
int accomp, int prcomp));
static struct mbuf *ppp_decode __ARGS((struct slip *sp,unsigned char c));
static struct mbuf *ppp_encode __ARGS((struct mbuf *bp,int32 ctlmap));
/*
* FCS lookup table as generated by fcsgen.c
*/
static unsigned 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
};
#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, accomp, prcomp)
struct ppphdr *ppp;
struct mbuf *data;
int accomp; /* Compress address/control fields? */
int prcomp; /* Compress protocol field? */
{
struct mbuf *bp;
register char *cp;
int hdrlen;
if(ppp->type >= 256)
prcomp = 0; /* Can't compress large values */
hdrlen = accomp ? 0 : 2;
hdrlen += prcomp ? 1 : 2;
/* Prepend header onto packet data */
if ((bp = pushdown(data, hdrlen)) == NULLBUF)
return NULLBUF;
/* Load header with proper values */
cp = bp->data;
if(!accomp){
*cp++ = ppp->addr;
*cp++ = ppp->control;
}
if(prcomp)
*cp = ppp->type;
else
put16(cp,ppp->type);
return bp;
}
/* Extract PPP header from incoming packet. Applies a heuristic to determine
* if address/control compression is in use: if the frame begins with 0xff,
* compression is off, otherwise it is on.
*/
int
ntohppp(ppp, bpp)
struct ppphdr *ppp;
struct mbuf **bpp;
{
int c;
if((c = pullchar(bpp)) == -1)
return -1;
if(c != HDLC_ALL_ADDR){
/* Compressed header */
ppp->addr = HDLC_ALL_ADDR;
ppp->control = HDLC_UI;
} else {
ppp->addr = c;
if((c = PULLCHAR(bpp)) == -1)
return -1;
ppp->control = c;
if((c = pullchar(bpp)) == -1)
return -1;
}
ppp->type = c;
if((c & 1) == 0){ /* Must be another byte */
ppp->type <<= 8;
if((c = pullchar(bpp)) == -1)
return -1;
ppp->type |= c;
}
return(PPP_HDRLEN);
}
/****************************************************************************/
/* Send IP datagram with Point-to-Point Protocol */
int
ppp_send(bp,iface,gateway,prec,del,tput,rel)
struct mbuf *bp; /* Buffer to send */
struct iface *iface; /* Pointer to interface control block */
int32 gateway; /* Ignored (PPP is point-to-point) */
int prec;
int del;
int tput;
int rel;
{
int type = PPP_IP_TYPE;
register struct slip *sp;
register struct slcompress *scp;
if(iface == NULLIF){
free_p(bp);
return -1;
}
sp = &Slip[iface->xdev];
if (sp->pppio->ipcpio.ipcp_state != IPCP_OPEN) {
free_p(bp);
sp->pppio->snderr++;
return -1;
}
if (sp->escaped & PPP_XMT_VJCOMPR) {
/* Look for TCP packets */
scp = sp->slcomp;
/* Attempt IP/TCP header compression */
type = sl_compress_tcp(&bp, scp, 1);
switch(type) {
case SL_TYPE_IP:
type = PPP_IP_TYPE;
break;
case SL_TYPE_COMPRESSED_TCP:
type = PPP_COMPR_TYPE;
break;
case SL_TYPE_UNCOMPRESSED_TCP:
type = PPP_UNCOMP_TYPE;
break;
default:
return -1;
}
}
sp->pppio->sndip++;
return (*iface->output)(iface,NULLCHAR,NULLCHAR,type,bp);
}
/* Send a packet with PPP header */
int
ppp_output(iface,dest,source,type,data)
struct iface *iface; /* 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 type; /* PPP Protocol Type field */
struct mbuf *data; /* Actual data to be sent */
{
struct slip *sp;
struct ppphdr ppp;
struct mbuf *bp;
sp = &Slip[iface->xdev];
if (sp->pppio->state == PPP_CLOSED) {
free_p(data);
sp->pppio->snderr++;
return -1;
}
ppp.addr = HDLC_ALL_ADDR;
ppp.control = HDLC_UI;
ppp.type = type;
if ((bp = htonppp(&ppp,data,sp->escaped & PPP_XMT_ACCOMP,sp->escaped & PPP_XMT_PRCOMP)) == NULLBUF) {
free_p(data);
return -1;
}
return (*iface->raw)(iface,bp);
}
/* Encode a raw packet in PPP framing, put on link output queue, and kick
* transmitter
*/
int
ppp_raw(iface,bp)
struct iface *iface;
struct mbuf *bp;
{
register struct slip *sp;
struct mbuf *bp1;
sp = &Slip[iface->xdev];
dump(iface,IF_TRACE_OUT,sp->type,bp);
iface->rawsndcnt++;
iface->lastsent = secclock();
/* Queue a frame on the PPP output queue and start transmitter */
if ((bp1 = ppp_encode(bp,sp->pppio->ctlmap)) == NULLBUF)
return -1;
if (iface->trace & IF_TRACE_RAW)
raw_dump(iface,IF_TRACE_OUT,bp1);
sp->pppio->sndpkt++;
return Slip[iface->xdev].send(iface->dev,bp1);
}
/* Encode a packet in PPP format */
static
struct mbuf *
ppp_encode(bp,ctlmap)
struct mbuf *bp;
int32 ctlmap;
{
struct mbuf *lbp; /* Mbuf containing line-ready packet */
register char *cp;
int c;
int16 calc_fcs;
/* Allocate output mbuf that's twice as long as the packet.
* This is a worst-case guess (consider a packet full of HDLC_FLAGs!)
*/
lbp = alloc_mbuf((int16)(2*len_p(bp) + HDLC_ENVLEN));
if(lbp == NULLBUF){
/* No space; drop */
free_p(bp);
return NULLBUF;
}
cp = lbp->data;
/* Flush out any line garbage */
*cp++ = HDLC_FLAG;
/* Initialize FCS */
calc_fcs = HDLC_FCS_START;
/* 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) && (ctlmap & (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) && (ctlmap & (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) && (ctlmap & (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;
lbp->cnt = cp - lbp->data;
return lbp;
}
/* Process incoming bytes in PPP format
* When a buffer is complete, return it; otherwise NULLBUF
*/
static
struct mbuf *
ppp_decode(sp,c)
register struct slip *sp;
unsigned char c; /* Incoming character */
{
struct mbuf *bp;
register struct pppctl *pppiop;
pppiop = sp->pppio;
switch(c){
case HDLC_FLAG: /* Start/end of packet */
/* Wrap it up if end of a packet */
if (sp->rbp != NULLBUF) {
if (pppiop->calc_fcs == HDLC_FCS_FINAL) {
/* Good packet, trim off FCS bytes */
trim_mbuf(&sp->rbp, (len_p(sp->rbp)-2));
} else {
/* FCS doesnt match; discard packet */
/*putchar('\007');*/
free_p(sp->rbp);
sp->rbp = NULLBUF;
sp->rcnt = 0;
pppiop->csumerr++;
}
}
/* Prepare for next packet */
bp = sp->rbp;
sp->escaped &= ~PPP_BIT_BUCKET;
sp->escaped &= ~PPP_ESCAPED;
sp->rbp = NULLBUF;
sp->rcnt = 0;
pppiop->calc_fcs = HDLC_FCS_START;
return bp; /* Will be NULLBUF if empty frame */
case HDLC_ESC_ASYNC: /* Async HDLC escape char */
sp->escaped |= PPP_ESCAPED;
return NULLBUF;
}
if(sp->escaped & PPP_BIT_BUCKET)
/* Eat bytes til end of packet */
return NULLBUF;
if(sp->escaped & PPP_ESCAPED){
/* Translate 2-char escape sequence back to original char */
sp->escaped &= ~PPP_ESCAPED;
c ^= HDLC_ESC_COMPL;
}
/* We reach here with a character for the buffer;
* make sure there's space for it
*/
if(sp->rbp == NULLBUF){
/* Allocate first mbuf for new packet */
if((sp->rbp1 = sp->rbp = alloc_mbuf(PPP_ALLOC)) == NULLBUF)
return NULLBUF; /* No memory, drop */
sp->rcp = sp->rbp->data;
} else if(sp->rbp1->cnt == PPP_ALLOC){
/* Current mbuf is full; link in another */
if((sp->rbp1->next = alloc_mbuf(PPP_ALLOC)) == NULLBUF){
/* No memory, drop whole thing */
free_p(sp->rbp);
sp->rbp = NULLBUF;
sp->rcnt = 0;
return NULLBUF;
}
sp->rbp1 = sp->rbp1->next;
sp->rcp = sp->rbp1->data;
}
/* Store the character, increment fragment and total
* byte counts
*/
/* Now add the actual character */
*sp->rcp++ = c;
sp->rbp1->cnt++;
sp->rcnt++;
pppiop->calc_fcs = pppfcs(pppiop->calc_fcs, c);
return NULLBUF;
}
/* Process PPP line input */
void
ppp_recv(dev,p1,p2)
int dev;
void *p1;
void *p2;
{
unsigned char c;
struct mbuf *bp,*nbp;
struct phdr phdr;
struct slip *sp;
int cdev;
sp = &Slip[dev];
cdev = sp->iface->dev;
for(;;){
c = sp->get(cdev);
if((bp = ppp_decode(sp,c)) == NULLBUF)
continue; /* More to come */
if((nbp = pushdown(bp,sizeof(phdr))) == NULLBUF){
free_p(bp);
continue;
}
phdr.iface = sp->iface;
phdr.type = sp->type;
memcpy(&nbp->data[0],(char *)&phdr,sizeof(phdr));
enqueue(&Hopper,nbp);
/* Especially on slow machines, serial I/O can be quite
* compute intensive, so release the machine before we
* go for the next packet. This will allow this packet to
* go on to its ultimate destination, helping pipelining
*/
pwait(NULL);
}
}
/****************************************************************************/
/* Wait for autobaud message to set line speed then switch to regular PPP */
void
ppp_autobaud(dev,p1,p2)
int dev;
void *p1;
void *p2;
{
struct slip *sp;
struct iface *ifp;
sp = &Slip[dev];
ifp = sp->iface;
/* Wait for an autobaud message */
asy_autobaud(ifp->dev);
/* Ready for PPP packets */
ifp->rxproc = newproc("ppp recv", 256, ppp_recv, ifp->xdev, NULL, NULL,0);
/* The LCP state machine has been waiting for us */
sp->pppio->state = PPP_CLOSED;
lcp_reset(sp->pppio);
lcp_start(sp);
/* Terminate this process */
return;
}
/* Keep track of RLSD signal; if RLSD is down, physical layer is down;
* if RLSD is asserted, physical layer is ready for traffic
*/
void
ppp_rlsd(dev,p1,p2)
int dev;
void *p1;
void *p2;
{
int last_rlsd = 1;
int i;
unsigned long autospeed;
struct slip *sp;
struct pppctl *pppiop;
struct ipcpctl *ipcpiop;
autospeed = (unsigned long)p1;
sp = &Slip[dev];
pppiop = sp->pppio;
for ( ; ; ) {
/* Wait for RLSD to change */
if (last_rlsd == 1) {
/* Down now, wait for RSLD to be asserted */
i = sp->get_rlsd(sp->iface->dev, 100);
} else {
/* Asserted now, wait for RSLD to be dropped */
i = sp->get_rlsd(sp->iface->dev, 1);
}
last_rlsd = i;
/*
printf("ppp_rlsd: rlsd state change: %d\n",last_rlsd);
*/
if (last_rlsd == 100) {
/* Physical layer now open for traffic */
if (Ppptrace)
log(-1,"%s: PPP/RLSD: Physical layer ready",
sp->iface->name);
/* RLSD signal is asserted */
if (pppiop->state == PPP_PL_DOWN) {
if (autospeed == 0L) {
pppiop->state = PPP_CLOSED;
lcp_reset(pppiop);
lcp_start(sp);
} else {
pppiop->state = PPP_AUTOBAUD;
}
}
} else {
/* Physical layer is down */
if (Ppptrace)
log(-1,"%s: PPP/RLSD: Physical layer down",
sp->iface->name);
/* RLSD signal not asserted */
if ((pppiop->state != PPP_CLOSED) &&
(pppiop->state != PPP_AUTOBAUD)) {
ipcpiop = &(pppiop->ipcpio);
if (ipcpiop->ipcp_state == IPCP_OPEN) {
/* Remove routing entry from table */
rt_drop(ipcpiop->attempt_dest,
(unsigned int)32);
}
/* Blast any layers that are open */
ipcp_reset(sp);
pap_init(sp);
lcp_reset(pppiop);
}
/* Physical layer closed to all traffic */
pppiop->state = PPP_PL_DOWN;
if (autospeed != 0L) {
killproc(sp->iface->rxproc);
sp->iface->rxproc = NULLPROC;
sp->iface->rxproc = newproc("ppp autobaud", 256,
ppp_autobaud, sp->iface->xdev, NULL, NULL,0);
}
}
}
}
/****************************************************************************/
/* Initialize PPP control structures for a Point-to-Point interface */
int
ppp_init(dev,rlsd,autospeed)
int dev;
char rlsd;
long autospeed;
{
struct slip *sp;
struct pppctl *pppiop;
sp = &Slip[dev];
pppiop = sp->pppio;
if (rlsd != 0)
pppiop->state = PPP_PL_DOWN; /* Must wait for RLSD signal */
else if (autospeed != 0L)
pppiop->state = PPP_AUTOBAUD; /* Wait for link speed msg */
else
pppiop->state = PPP_CLOSED; /* Ready for traffic */
pppiop->ctlmap = DEF_CTL_MAP; /* Overall PPP parameters */
lcp_init(sp); /* Link Control parameters */
pap_init(sp); /* Peer Authentication parameters */
ipcp_init(sp); /* IP Control parameters */
return 0;
}
/* Close the PPP interface */
int
ppp_close(sp,pl_too)
struct slip *sp;
int pl_too;
{
int argc = 2;
char *argv[] = {
"dtr",
"0",
};
ipcp_close(sp); /* Close IP layer */
lcp_close(sp); /* Close Link layer */
if (pl_too) { /* Close physical layer */
sp->iface->ioctl(sp->iface,argc,argv);
}
sp->pppio->lcpio.active = -1; /* We are strictly closed */
tprintf("PPP interface %s closed\n",sp->iface->name);
return 0;
}
/* Process incoming PPP packets */
void
pproc(iface,bp)
struct iface *iface;
struct mbuf *bp;
{
struct ppphdr hdr;
struct pppctl *pppiop;
struct slip *sp;
register int16 len;
sp = &Slip[iface->xdev];
pppiop = Slip[iface->xdev].pppio;
pppiop->rcvpkt++;
/* Remove PPP header and kick packet upstairs */
ntohppp(&hdr, &bp);
switch(hdr.type) {
case PPP_IP_TYPE: /* Regular IP */
if ((pppiop->ipcpio.ipcp_state != IPCP_OPEN) &&
(pppiop->ipcpio.ipcp_state != IPCP_TERMINATE)) {
if (Ppptrace)
log(-1,"PPP link not open for IP traffic; dropping IP packet");
pppiop->rcverr++;
/*
printf("rcverr: link not open for IP\n");
fflush(stdout);
*/
free_p(bp);
break;
}
pppiop->rcvip++;
if (sp->escaped & PPP_RCV_VJCOMPR) {
if(bp->data[9] == TCP_PTCL) /* FIX THIS! */
sp->slcomp->sls_tcpin++;
else
sp->slcomp->sls_nontcpin++;
}
ip_route(iface,bp,0);
break;
case PPP_COMPR_TYPE: /* Van Jacobson Compressed TCP/IP */
if (pppiop->ipcpio.ipcp_state != IPCP_OPEN) {
if (Ppptrace)
log(-1,"PPP link not open for IP traffic; dropping Compressed TCP/IP packet");
pppiop->rcverr++;
/*
printf("rcverr: link not open for VJ Compr\n");
fflush(stdout);
*/
free_p(bp);
break;
}
if ((len = len_p(bp)) < 3) {
if (Ppptrace)
log(-1,"VJ Compressed TCP/IP packet error: short");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: short VJ Compr pkt\n");
fflush(stdout);
*/
break;
}
/* Got a packet at least minimum length of
* a compressed packet
*/
if ((sp->escaped & PPP_RCV_VJCOMPR) == 0) {
if (Ppptrace)
log(-1,"VJ Compressed TCP/IP packet error: not enabled");
pppiop->rcverr++;
/*
printf("rcverr: VJ Compr not enabled\n");
fflush(stdout);
*/
free_p(bp);
break;
}
/* Got a packet other than regular IP */
len = sl_uncompress_tcp(&bp, len,
SL_TYPE_COMPRESSED_TCP,
sp->slcomp);
if (len <= 0) {
free_p(bp);
bp = NULLBUF;
pppiop->rcverr++;
/*
printf("rcverr: VJ Compr decompr error\n");
fflush(stdout);
*/
break;
}
pppiop->rcvip++;
ip_route(iface,bp,0);
break;
case PPP_UNCOMP_TYPE: /* Van Jacobson Uncompressed TCP/IP */
if (pppiop->ipcpio.ipcp_state != IPCP_OPEN) {
if (Ppptrace)
log(-1,"PPP link not open for IP traffic; dropping Uncompressed TCP/IP packet");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: link not open for VJ uncompr\n");
fflush(stdout);
*/
break;
}
if ((len = len_p(bp)) < 3) {
if (Ppptrace)
log(-1,"VJ Uncompressed TCP/IP packet error: short");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: short VJ Uncompr pkt\n");
fflush(stdout);
*/
break;
}
/* Got a packet at least minimum length of
* a compressed packet
*/
if ((sp->escaped & PPP_RCV_VJCOMPR) == 0) {
if (Ppptrace)
log(-1,"VJ Uncompressed TCP/IP packet error: not enabled");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: VJ Uncompr not enabled\n");
fflush(stdout);
*/
break;
}
/* Got a packet other than regular IP */
len = sl_uncompress_tcp(&bp, len,
SL_TYPE_UNCOMPRESSED_TCP,
sp->slcomp);
if (len <= 0) {
free_p(bp);
bp = NULLBUF;
pppiop->rcverr++;
/*
printf("rcverr: VJ Uncompr decompr error\n");
fflush(stdout);
*/
break;
}
pppiop->rcvip++;
ip_route(iface,bp,0);
break;
case PPP_LCP_TYPE: /* Link Control Protocol */
pppiop->rcvlcp++;
lcpproc(iface,bp);
break;
case PPP_PAP_TYPE: /* Password Authenticate Protocol */
if (pppiop->lcpio.lcp_state != LCP_OPEN) {
if (Ppptrace)
log(-1,"not in PAP phase; dropping PAP packet");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: not open for PAP\n");
fflush(stdout);
*/
break;
}
pppiop->rcvpap++;
papproc(iface,bp);
break;
case PPP_IPCP_TYPE: /* IP Control Protocol */
if (pppiop->lcpio.lcp_state != LCP_OPEN) {
if (Ppptrace)
log(-1,"IPCP closed; dropping IPCP packet");
free_p(bp);
pppiop->rcverr++;
/*
printf("rcverr: not open for IPCP\n");
fflush(stdout);
*/
break;
}
pppiop->rcvipcp++;
ipcpproc(iface,bp);
break;
default:
if (Ppptrace)
log(-1,"Unknown PPP packet type: %x; dropping packet",hdr.type);
free_p(bp);
pppiop->rcvunk++;
break;
}
return;
}