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Added packet filtering, support for "PPP Deflate" packet compression,

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trivial multicast support, and support for xon/xoff output flow
control to the PPP subsystem.  Fixed several bugs, including making
the accumulation and resetting of statistics more consistent.  State
for the VJ compressor is now dynamically allocated.
This commit is contained in:
paulus 1996-03-15 02:28:00 +00:00
parent 1b7b5cb771
commit 6654fd558b
10 changed files with 6157 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sys/net/bsd-comp.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: bsd-comp.c,v 1.3 1996/03/03 17:18:14 thorpej Exp $ */
/* $NetBSD: bsd-comp.c,v 1.4 1996/03/15 02:28:00 paulus Exp $ */
/* Because this code is derived from the 4.3BSD compress source:
*
@ -314,7 +314,7 @@ bsd_alloc(options, opt_len, decomp)
u_int newlen, hsize, hshift, maxmaxcode;
struct bsd_db *db;
if (opt_len != CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
if (opt_len < CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
|| options[1] != CILEN_BSD_COMPRESS
|| BSD_VERSION(options[2]) != BSD_CURRENT_VERSION)
return NULL;
@ -412,7 +412,7 @@ bsd_init(db, options, opt_len, unit, hdrlen, mru, debug, decomp)
{
int i;
if (opt_len != CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
if (opt_len < CILEN_BSD_COMPRESS || options[0] != CI_BSD_COMPRESS
|| options[1] != CILEN_BSD_COMPRESS
|| BSD_VERSION(options[2]) != BSD_CURRENT_VERSION
|| BSD_NBITS(options[2]) != db->maxbits

219
sys/net/if_ppp.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_ppp.c,v 1.28 1996/02/13 22:00:18 christos Exp $ */
/* $NetBSD: if_ppp.c,v 1.29 1996/03/15 02:28:03 paulus Exp $ */
/*
* if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
@ -87,11 +87,14 @@
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#if INET
#include <netinet/in.h>
@ -155,10 +158,14 @@ static void pppdumpm __P((struct mbuf *m0));
*/
extern struct compressor ppp_bsd_compress;
extern struct compressor ppp_deflate;
struct compressor *ppp_compressors[8] = {
#if DO_BSD_COMPRESS
&ppp_bsd_compress,
#endif
#if DO_DEFLATE
&ppp_deflate,
#endif
NULL
};
@ -177,7 +184,7 @@ pppattach()
sc->sc_if.if_name = "ppp";
sc->sc_if.if_unit = i++;
sc->sc_if.if_mtu = PPP_MTU;
sc->sc_if.if_flags = IFF_POINTOPOINT;
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 = pppsioctl;
@ -217,8 +224,12 @@ pppalloc(pid)
sc->sc_flags = 0;
sc->sc_mru = PPP_MRU;
sc->sc_relinq = NULL;
bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
#ifdef VJC
sl_compress_init(&sc->sc_comp, -1);
MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
M_DEVBUF, M_NOWAIT);
if (sc->sc_comp)
sl_compress_init(sc->sc_comp, -1);
#endif
#ifdef PPP_COMPRESS
sc->sc_xc_state = NULL;
@ -277,6 +288,22 @@ pppdealloc(sc)
sc->sc_xc_state = NULL;
sc->sc_rc_state = NULL;
#endif /* PPP_COMPRESS */
if (sc->sc_pass_filt.bf_insns != 0) {
FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF);
sc->sc_pass_filt.bf_insns = 0;
sc->sc_pass_filt.bf_len = 0;
}
if (sc->sc_active_filt.bf_insns != 0) {
FREE(sc->sc_active_filt.bf_insns, M_DEVBUF);
sc->sc_active_filt.bf_insns = 0;
sc->sc_active_filt.bf_len = 0;
}
#ifdef VJC
if (sc->sc_comp != 0) {
FREE(sc->sc_comp, M_DEVBUF);
sc->sc_comp = 0;
}
#endif
}
/*
@ -295,6 +322,9 @@ pppioctl(sc, cmd, data, flag, p)
struct compressor **cp;
struct npioctl *npi;
time_t t;
struct bpf_program *bp, *nbp;
struct bpf_insn *newcode, *oldcode;
int newcodelen;
#ifdef PPP_COMPRESS
u_char ccp_option[CCP_MAX_OPTION_LENGTH];
#endif
@ -342,9 +372,11 @@ pppioctl(sc, cmd, data, flag, p)
case PPPIOCSMAXCID:
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
s = splsoftnet();
sl_compress_init(&sc->sc_comp, *(int *)data);
splx(s);
if (sc->sc_comp) {
s = splsoftnet();
sl_compress_init(sc->sc_comp, *(int *)data);
splx(s);
}
break;
#endif
@ -448,6 +480,38 @@ pppioctl(sc, cmd, data, flag, p)
splx(s);
break;
case PPPIOCSPASS:
case PPPIOCSACTIVE:
nbp = (struct bpf_program *) data;
if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
return EINVAL;
newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
if (newcodelen != 0) {
MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK);
if (newcode == 0) {
return EINVAL; /* or sumpin */
}
if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
newcodelen)) != 0) {
FREE(newcode, M_DEVBUF);
return error;
}
if (!bpf_validate(newcode, nbp->bf_len)) {
FREE(newcode, M_DEVBUF);
return EINVAL;
}
} else
newcode = 0;
bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
oldcode = bp->bf_insns;
s = splimp();
bp->bf_len = nbp->bf_len;
bp->bf_insns = newcode;
splx(s);
if (oldcode != 0)
FREE(oldcode, M_DEVBUF);
break;
default:
return (-1);
}
@ -499,24 +563,38 @@ pppsioctl(ifp, cmd, data)
ifr->ifr_mtu = sc->sc_if.if_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
error = EAFNOSUPPORT;
break;
}
switch(ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
case SIOCGPPPSTATS:
psp = &((struct ifpppstatsreq *) data)->stats;
bzero(psp, sizeof(*psp));
psp->p.ppp_ibytes = sc->sc_bytesrcvd;
psp->p.ppp_ipackets = ifp->if_ipackets;
psp->p.ppp_ierrors = ifp->if_ierrors;
psp->p.ppp_obytes = sc->sc_bytessent;
psp->p.ppp_opackets = ifp->if_opackets;
psp->p.ppp_oerrors = ifp->if_oerrors;
#ifdef VJC
psp->vj.vjs_packets = sc->sc_comp.sls_packets;
psp->vj.vjs_compressed = sc->sc_comp.sls_compressed;
psp->vj.vjs_searches = sc->sc_comp.sls_searches;
psp->vj.vjs_misses = sc->sc_comp.sls_misses;
psp->vj.vjs_uncompressedin = sc->sc_comp.sls_uncompressedin;
psp->vj.vjs_compressedin = sc->sc_comp.sls_compressedin;
psp->vj.vjs_errorin = sc->sc_comp.sls_errorin;
psp->vj.vjs_tossed = sc->sc_comp.sls_tossed;
psp->p = sc->sc_stats;
#if defined(VJC) && !defined(SL_NO_STATS)
if (sc->sc_comp) {
psp->vj.vjs_packets = sc->sc_comp->sls_packets;
psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
psp->vj.vjs_searches = sc->sc_comp->sls_searches;
psp->vj.vjs_misses = sc->sc_comp->sls_misses;
psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
}
#endif /* VJC */
break;
@ -556,6 +634,8 @@ pppoutput(ifp, m0, dst, rtp)
struct ip *ip;
struct ifqueue *ifq;
enum NPmode mode;
int active, len;
struct mbuf *m;
if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
|| ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
@ -629,11 +709,39 @@ pppoutput(ifp, m0, dst, rtp)
*cp++ = protocol & 0xff;
m0->m_len += PPP_HDRLEN;
len = 0;
for (m = m0; m != 0; m = m->m_next)
len += m->m_len;
if (sc->sc_flags & SC_LOG_OUTPKT) {
printf("ppp%d output: ", ifp->if_unit);
pppdumpm(m0);
}
/*
* Apply the pass and active filters to the packet,
* but only if it is a data packet.
*/
active = 0;
if ((protocol & 0x8000) == 0) {
*mtod(m0, u_char *) = 1; /* indicates outbound */
if (sc->sc_pass_filt.bf_insns != 0
&& bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
len, 0) == 0) {
error = 0; /* drop this packet */
goto bad;
}
/*
* Update the time we sent the most recent packet.
*/
if (sc->sc_active_filt.bf_insns == 0
|| bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
sc->sc_last_sent = time.tv_sec;
*mtod(m0, u_char *) = address;
}
#if NBPFILTER > 0
/*
* See if bpf wants to look at the packet.
@ -653,10 +761,11 @@ pppoutput(ifp, m0, dst, rtp)
sc->sc_npqtail = &m0->m_nextpkt;
} else {
ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd;
if (IF_QFULL(ifq)) {
if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
IF_DROP(ifq);
splx(s);
sc->sc_if.if_oerrors++;
sc->sc_stats.ppp_oerrors++;
error = ENOBUFS;
goto bad;
}
@ -664,6 +773,8 @@ pppoutput(ifp, m0, dst, rtp)
(*sc->sc_start)(sc);
}
ifp->if_lastchange = time;
ifp->if_opackets++;
ifp->if_obytes += len;
splx(s);
return (0);
@ -706,6 +817,7 @@ ppp_requeue(sc)
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
sc->sc_if.if_oerrors++;
sc->sc_stats.ppp_oerrors++;
} else
IF_ENQUEUE(ifq, m);
break;
@ -806,6 +918,8 @@ ppp_outpkt(sc)
if (m == NULL)
return;
++sc->sc_stats.ppp_opackets;
/*
* Extract the ppp header of the new packet.
* The ppp header will be in one mbuf.
@ -817,16 +931,11 @@ ppp_outpkt(sc)
switch (protocol) {
case PPP_IP:
/*
* Update the time we sent the most recent packet.
*/
sc->sc_last_sent = time.tv_sec;
#ifdef VJC
/*
* If the packet is a TCP/IP packet, see if we can compress it.
*/
if (sc->sc_flags & SC_COMP_TCP) {
if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
struct ip *ip;
int type;
@ -840,7 +949,7 @@ ppp_outpkt(sc)
}
/* this code assumes the IP/TCP header is in one non-shared mbuf */
if (ip->ip_p == IPPROTO_TCP) {
type = sl_compress_tcp(mp, ip, &sc->sc_comp,
type = sl_compress_tcp(mp, ip, sc->sc_comp,
!(sc->sc_flags & SC_NO_TCP_CCID));
switch (type) {
case TYPE_UNCOMPRESSED_TCP:
@ -870,7 +979,7 @@ ppp_outpkt(sc)
#ifdef PPP_COMPRESS
if (protocol != PPP_LCP && protocol != PPP_CCP
&& sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
struct mbuf *mcomp;
struct mbuf *mcomp = NULL;
int slen, clen;
slen = 0;
@ -1064,20 +1173,19 @@ ppp_inproc(sc, m)
{
struct ifnet *ifp = &sc->sc_if;
struct ifqueue *inq;
int s, ilen = 0, xlen, proto, rv;
int s, ilen, xlen, proto, rv;
u_char *cp, adrs, ctrl;
struct mbuf *mp, *dmp;
struct mbuf *mp, *dmp = NULL;
u_char *iphdr;
u_int hlen;
ifp->if_ipackets++;
ifp->if_lastchange = time;
sc->sc_stats.ppp_ipackets++;
if (sc->sc_flags & SC_LOG_INPKT) {
register int len = 0;
ilen = 0;
for (mp = m; mp != NULL; mp = mp->m_next)
len += mp->m_len;
printf("ppp%d: got %d bytes\n", ifp->if_unit, len);
ilen += mp->m_len;
printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
pppdumpm(m);
}
@ -1149,7 +1257,8 @@ ppp_inproc(sc, m)
* If we've missed a packet, we must toss subsequent compressed
* packets which don't have an explicit connection ID.
*/
sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &sc->sc_comp);
if (sc->sc_comp)
sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
s = splhigh();
sc->sc_flags &= ~SC_VJ_RESET;
splx(s);
@ -1159,12 +1268,12 @@ ppp_inproc(sc, m)
* See if we have a VJ-compressed packet to uncompress.
*/
if (proto == PPP_VJC_COMP) {
if (sc->sc_flags & SC_REJ_COMP_TCP)
if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
goto bad;
xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
&sc->sc_comp, &iphdr, &hlen);
sc->sc_comp, &iphdr, &hlen);
if (xlen <= 0) {
if (sc->sc_flags & SC_DEBUG)
@ -1211,12 +1320,12 @@ ppp_inproc(sc, m)
ilen += hlen - xlen;
} else if (proto == PPP_VJC_UNCOMP) {
if (sc->sc_flags & SC_REJ_COMP_TCP)
if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
goto bad;
xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
&sc->sc_comp, &iphdr, &hlen);
sc->sc_comp, &iphdr, &hlen);
if (xlen < 0) {
if (sc->sc_flags & SC_DEBUG)
@ -1246,6 +1355,27 @@ ppp_inproc(sc, m)
m->m_pkthdr.len = ilen;
m->m_pkthdr.rcvif = ifp;
/*
* See whether we want to pass this packet, and
* if it counts as link activity.
*/
if ((proto & 0x8000) == 0) {
adrs = *mtod(m, u_char *); /* save address field */
*mtod(m, u_char *) = 0; /* indicate inbound */
if (sc->sc_pass_filt.bf_insns != 0
&& bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
ilen, 0) == 0) {
/* drop this packet */
m_freem(m);
return;
}
if (sc->sc_active_filt.bf_insns == 0
|| bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
sc->sc_last_recv = time.tv_sec;
*mtod(m, u_char *) = adrs;
}
#if NBPFILTER > 0
/* See if bpf wants to look at the packet. */
if (sc->sc_bpf)
@ -1270,7 +1400,6 @@ ppp_inproc(sc, m)
m->m_len -= PPP_HDRLEN;
schednetisr(NETISR_IP);
inq = &ipintrq;
sc->sc_last_recv = time.tv_sec; /* update time of last pkt rcvd */
break;
#endif
@ -1297,6 +1426,9 @@ ppp_inproc(sc, m)
}
IF_ENQUEUE(inq, m);
splx(s);
ifp->if_ipackets++;
ifp->if_ibytes += ilen;
ifp->if_lastchange = time;
if (rv)
(*sc->sc_ctlp)(sc);
@ -1306,6 +1438,7 @@ ppp_inproc(sc, m)
bad:
m_freem(m);
sc->sc_if.if_ierrors++;
sc->sc_stats.ppp_ierrors++;
}
#define MAX_DUMP_BYTES 128

10
sys/net/if_ppp.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_ppp.h,v 1.10 1996/02/13 22:00:21 christos Exp $ */
/* $NetBSD: if_ppp.h,v 1.11 1996/03/15 02:28:05 paulus Exp $ */
/*
* if_ppp.h - Point-to-Point Protocol definitions.
@ -111,6 +111,8 @@ struct ifpppcstatsreq {
#define PPPIOCGNPMODE _IOWR('t', 76, struct npioctl) /* get NP mode */
#define PPPIOCSNPMODE _IOW('t', 75, struct npioctl) /* set NP mode */
#define PPPIOCGIDLE _IOR('t', 74, struct ppp_idle) /* get idle time */
#define PPPIOCSPASS _IOW('t', 71, struct bpf_program) /* set pass filter */
#define PPPIOCSACTIVE _IOW('t', 70, struct bpf_program) /* set active filt */
/* PPPIOC[GS]MTU are alternatives to SIOC[GS]IFMTU, used under Ultrix */
#define PPPIOCGMTU _IOR('t', 73, int) /* get interface MTU */
@ -126,16 +128,12 @@ struct ifpppcstatsreq {
#if !defined(ifr_mtu)
#define ifr_mtu ifr_ifru.ifru_metric
#endif
#ifdef _KERNEL
void pppattach __P((void));
struct ppp_softc *pppalloc __P((pid_t));
void pppdealloc __P((struct ppp_softc *));
int pppioctl __P((struct ppp_softc *, u_long, caddr_t, int, struct proc *));
int pppsioctl __P((struct ifnet *, u_long, caddr_t));
int pppoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *));
struct mbuf *ppp_dequeue __P((struct ppp_softc *));
void pppintr __P((void));
void ppppktin __P((struct ppp_softc *, struct mbuf *, int));
#endif
#endif /* _IF_PPP_H_ */

13
sys/net/if_pppvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_pppvar.h,v 1.2 1995/07/04 15:30:39 briggs Exp $ */
/* $NetBSD: if_pppvar.h,v 1.3 1996/03/15 02:28:06 paulus Exp $ */
/*
* if_pppvar.h - private structures and declarations for PPP.
*
@ -66,11 +66,7 @@ struct ppp_softc {
struct mbuf *sc_togo; /* output packet ready to go */
struct mbuf *sc_npqueue; /* output packets not to be sent yet */
struct mbuf **sc_npqtail; /* ptr to last next ptr in npqueue */
#ifdef VJC
struct slcompress sc_comp; /* vjc control buffer */
#endif
u_int sc_bytessent; /* count of octets sent */
u_int sc_bytesrcvd; /* count of octets received */
struct pppstat sc_stats; /* count of bytes/pkts sent/rcvd */
caddr_t sc_bpf; /* hook for BPF */
enum NPmode sc_npmode[NUM_NP]; /* what to do with each NP */
struct compressor *sc_xcomp; /* transmit compressor */
@ -79,6 +75,11 @@ struct ppp_softc {
void *sc_rc_state; /* receive decompressor state */
time_t sc_last_sent; /* time (secs) last NP pkt sent */
time_t sc_last_recv; /* time (secs) last NP pkt rcvd */
struct bpf_program sc_pass_filt; /* filter for packets to pass */
struct bpf_program sc_active_filt; /* filter for "non-idle" packets */
#ifdef VJC
struct slcompress *sc_comp; /* vjc control buffer */
#endif
/* Device-dependent part for async lines. */
ext_accm sc_asyncmap; /* async control character map */

28
sys/net/ppp-comp.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: ppp-comp.h,v 1.1 1995/07/04 06:28:24 paulus Exp $ */
/* $NetBSD: ppp-comp.h,v 1.2 1996/03/15 02:28:07 paulus Exp $ */
/*
* ppp-comp.h - Definitions for doing PPP packet compression.
@ -26,7 +26,6 @@
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
*
* $Id: ppp-comp.h,v 1.1 1995/07/04 06:28:24 paulus Exp $
*/
#ifndef _NET_PPP_COMP_H
@ -39,6 +38,11 @@
#ifndef DO_BSD_COMPRESS
#define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */
#endif
#ifndef DO_DEFLATE
#define DO_DEFLATE 1 /* by default, include Deflate */
#endif
#define DO_PREDICTOR_1 0
#define DO_PREDICTOR_2 0
/*
* Structure giving methods for compression/decompression.
@ -135,4 +139,24 @@ struct compressor {
#define BSD_MIN_BITS 9 /* smallest code size supported */
#define BSD_MAX_BITS 15 /* largest code size supported */
/*
* Definitions for other, as yet unsupported, compression methods.
*/
#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */
#define CILEN_PREDICTOR_1 2 /* length of its config option */
#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */
#define CILEN_PREDICTOR_2 2 /* length of its config option */
#define CI_DEFLATE 24 /* config option for Deflate */
#define CILEN_DEFLATE 4 /* length of its config option */
#define DEFLATE_MIN_SIZE 8
#define DEFLATE_MAX_SIZE 15
#define DEFLATE_METHOD_VAL 8
#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE)
#define DEFLATE_METHOD(x) ((x) & 0x0F)
#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \
+ DEFLATE_METHOD_VAL)
#define DEFLATE_CHK_SEQUENCE 0
#endif /* _NET_PPP_COMP_H */

653
sys/net/ppp-deflate.c Normal file
View File

@ -0,0 +1,653 @@
/* $NetBSD: ppp-deflate.c,v 1.1 1996/03/15 02:28:09 paulus Exp $ */
/*
* ppp_deflate.c - interface the zlib procedures for Deflate compression
* and decompression (as used by gzip) to the PPP code.
* This version is for use with mbufs on BSD-derived systems.
*
* Copyright (c) 1994 The Australian National University.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, provided that the above copyright
* notice appears in all copies. This software is provided without any
* warranty, express or implied. The Australian National University
* makes no representations about the suitability of this software for
* any purpose.
*
* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
* THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <net/ppp_defs.h>
#include <net/zlib.h>
#define PACKETPTR struct mbuf *
#include <net/ppp-comp.h>
#if DO_DEFLATE
/*
* State for a Deflate (de)compressor.
*/
struct deflate_state {
int seqno;
int w_size;
int unit;
int hdrlen;
int mru;
int debug;
z_stream strm;
struct compstat stats;
};
#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
static void *zalloc __P((void *, u_int items, u_int size));
static void zfree __P((void *, void *ptr, u_int nb));
static void *z_comp_alloc __P((u_char *options, int opt_len));
static void *z_decomp_alloc __P((u_char *options, int opt_len));
static void z_comp_free __P((void *state));
static void z_decomp_free __P((void *state));
static int z_comp_init __P((void *state, u_char *options, int opt_len,
int unit, int hdrlen, int debug));
static int z_decomp_init __P((void *state, u_char *options, int opt_len,
int unit, int hdrlen, int mru, int debug));
static int z_compress __P((void *state, struct mbuf **mret,
struct mbuf *mp, int slen, int maxolen));
static void z_incomp __P((void *state, struct mbuf *dmsg));
static int z_decompress __P((void *state, struct mbuf *cmp,
struct mbuf **dmpp));
static void z_comp_reset __P((void *state));
static void z_decomp_reset __P((void *state));
static void z_comp_stats __P((void *state, struct compstat *stats));
/*
* Procedures exported to if_ppp.c.
*/
struct compressor ppp_deflate = {
CI_DEFLATE, /* compress_proto */
z_comp_alloc, /* comp_alloc */
z_comp_free, /* comp_free */
z_comp_init, /* comp_init */
z_comp_reset, /* comp_reset */
z_compress, /* compress */
z_comp_stats, /* comp_stat */
z_decomp_alloc, /* decomp_alloc */
z_decomp_free, /* decomp_free */
z_decomp_init, /* decomp_init */
z_decomp_reset, /* decomp_reset */
z_decompress, /* decompress */
z_incomp, /* incomp */
z_comp_stats, /* decomp_stat */
};
/*
* Space allocation and freeing routines for use by zlib routines.
*/
void *
zalloc(notused, items, size)
void *notused;
u_int items, size;
{
void *ptr;
MALLOC(ptr, void *, items * size, M_DEVBUF, M_NOWAIT);
return ptr;
}
void
zfree(notused, ptr, nbytes)
void *notused;
void *ptr;
u_int nbytes;
{
FREE(ptr, M_DEVBUF);
}
/*
* Allocate space for a compressor.
*/
static void *
z_comp_alloc(options, opt_len)
u_char *options;
int opt_len;
{
struct deflate_state *state;
int w_size;
if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
|| options[1] != CILEN_DEFLATE
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|| options[3] != DEFLATE_CHK_SEQUENCE)
return NULL;
w_size = DEFLATE_SIZE(options[2]);
if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
return NULL;
MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
M_DEVBUF, M_NOWAIT);
if (state == NULL)
return NULL;
state->strm.next_in = NULL;
state->strm.zalloc = zalloc;
state->strm.zfree = zfree;
if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
-w_size, 8, Z_DEFAULT_STRATEGY, DEFLATE_OVHD+2) != Z_OK) {
FREE(state, M_DEVBUF);
return NULL;
}
state->w_size = w_size;
bzero(&state->stats, sizeof(state->stats));
return (void *) state;
}
static void
z_comp_free(arg)
void *arg;
{
struct deflate_state *state = (struct deflate_state *) arg;
deflateEnd(&state->strm);
FREE(state, M_DEVBUF);
}
static int
z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
void *arg;
u_char *options;
int opt_len, unit, hdrlen, debug;
{
struct deflate_state *state = (struct deflate_state *) arg;
if (opt_len < CILEN_DEFLATE || options[0] != CI_DEFLATE
|| options[1] != CILEN_DEFLATE
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|| DEFLATE_SIZE(options[2]) != state->w_size
|| options[3] != DEFLATE_CHK_SEQUENCE)
return 0;
state->seqno = 0;
state->unit = unit;
state->hdrlen = hdrlen;
state->debug = debug;
deflateReset(&state->strm);
return 1;
}
static void
z_comp_reset(arg)
void *arg;
{
struct deflate_state *state = (struct deflate_state *) arg;
state->seqno = 0;
deflateReset(&state->strm);
}
int
z_compress(arg, mret, mp, orig_len, maxolen)
void *arg;
struct mbuf **mret; /* compressed packet (out) */
struct mbuf *mp; /* uncompressed packet (in) */
int orig_len, maxolen;
{
struct deflate_state *state = (struct deflate_state *) arg;
u_char *rptr, *wptr;
int proto, olen, wspace, r, flush;
struct mbuf *m;
/*
* Check that the protocol is in the range we handle.
*/
rptr = mtod(mp, u_char *);
proto = PPP_PROTOCOL(rptr);
if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) {
*mret = NULL;
return orig_len;
}
/* Allocate one mbuf initially. */
if (maxolen > orig_len)
maxolen = orig_len;
MGET(m, M_DONTWAIT, MT_DATA);
*mret = m;
if (m != NULL) {
m->m_len = 0;
if (maxolen + state->hdrlen > MLEN)
MCLGET(m, M_DONTWAIT);
wspace = M_TRAILINGSPACE(m);
if (state->hdrlen + PPP_HDRLEN + 2 < wspace) {
m->m_data += state->hdrlen;
wspace -= state->hdrlen;
}
wptr = mtod(m, u_char *);
/*
* Copy over the PPP header and store the 2-byte sequence number.
*/
wptr[0] = PPP_ADDRESS(rptr);
wptr[1] = PPP_CONTROL(rptr);
wptr[2] = PPP_COMP >> 8;
wptr[3] = PPP_COMP;
wptr += PPP_HDRLEN;
wptr[0] = state->seqno >> 8;
wptr[1] = state->seqno;
wptr += 2;
state->strm.next_out = wptr;
state->strm.avail_out = wspace - (PPP_HDRLEN + 2);
} else {
state->strm.next_out = NULL;
state->strm.avail_out = 1000000;
wptr = NULL;
wspace = 0;
}
++state->seqno;
rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */
state->strm.next_in = rptr;
state->strm.avail_in = mtod(mp, u_char *) + mp->m_len - rptr;
mp = mp->m_next;
flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
olen = 0;
for (;;) {
r = deflate(&state->strm, flush);
if (r != Z_OK) {
printf("z_compress: deflate returned %d (%s)\n",
r, (state->strm.msg? state->strm.msg: ""));
break;
}
if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
break; /* all done */
if (state->strm.avail_in == 0 && mp != NULL) {
state->strm.next_in = mtod(mp, u_char *);
state->strm.avail_in = mp->m_len;
mp = mp->m_next;
if (mp == NULL)
flush = Z_PACKET_FLUSH;
}
if (state->strm.avail_out == 0) {
if (m != NULL) {
m->m_len = wspace;
olen += wspace;
MGET(m->m_next, M_DONTWAIT, MT_DATA);
m = m->m_next;
if (m != NULL) {
m->m_len = 0;
if (maxolen - olen > MLEN)
MCLGET(m, M_DONTWAIT);
state->strm.next_out = mtod(m, u_char *);
state->strm.avail_out = wspace = M_TRAILINGSPACE(m);
}
}
if (m == NULL) {
state->strm.next_out = NULL;
state->strm.avail_out = 1000000;
}
}
}
if (m != NULL)
olen += (m->m_len = wspace - state->strm.avail_out);
/*
* See if we managed to reduce the size of the packet.
* If the compressor just gave us a single zero byte, it means
* the packet was incompressible.
*/
if (m != NULL && olen < orig_len
&& !(olen == PPP_HDRLEN + 3 && *wptr == 0)) {
state->stats.comp_bytes += olen;
state->stats.comp_packets++;
} else {
if (*mret != NULL) {
m_freem(*mret);
*mret = NULL;
}
state->stats.inc_bytes += orig_len;
state->stats.inc_packets++;
olen = orig_len;
}
state->stats.unc_bytes += orig_len;
state->stats.unc_packets++;
return olen;
}
static void
z_comp_stats(arg, stats)
void *arg;
struct compstat *stats;
{
struct deflate_state *state = (struct deflate_state *) arg;
u_int out;
*stats = state->stats;
stats->ratio = stats->unc_bytes;
out = stats->comp_bytes + stats->inc_bytes;
if (stats->ratio <= 0x7ffffff)
stats->ratio <<= 8;
else
out >>= 8;
if (out != 0)
stats->ratio /= out;
}
/*
* Allocate space for a decompressor.
*/
static void *
z_decomp_alloc(options, opt_len)
u_char *options;
int opt_len;
{
struct deflate_state *state;
int w_size;
if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
|| options[1] != CILEN_DEFLATE
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|| options[3] != DEFLATE_CHK_SEQUENCE)
return NULL;
w_size = DEFLATE_SIZE(options[2]);
if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
return NULL;
MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
M_DEVBUF, M_NOWAIT);
if (state == NULL)
return NULL;
state->strm.next_out = NULL;
state->strm.zalloc = zalloc;
state->strm.zfree = zfree;
if (inflateInit2(&state->strm, -w_size) != Z_OK) {
FREE(state, M_DEVBUF);
return NULL;
}
state->w_size = w_size;
bzero(&state->stats, sizeof(state->stats));
return (void *) state;
}
static void
z_decomp_free(arg)
void *arg;
{
struct deflate_state *state = (struct deflate_state *) arg;
inflateEnd(&state->strm);
FREE(state, M_DEVBUF);
}
static int
z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
void *arg;
u_char *options;
int opt_len, unit, hdrlen, mru, debug;
{
struct deflate_state *state = (struct deflate_state *) arg;
if (opt_len < CILEN_DEFLATE || options[0] != CI_DEFLATE
|| options[1] != CILEN_DEFLATE
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|| DEFLATE_SIZE(options[2]) != state->w_size
|| options[3] != DEFLATE_CHK_SEQUENCE)
return 0;
state->seqno = 0;
state->unit = unit;
state->hdrlen = hdrlen;
state->debug = debug;
state->mru = mru;
inflateReset(&state->strm);
return 1;
}
static void
z_decomp_reset(arg)
void *arg;
{
struct deflate_state *state = (struct deflate_state *) arg;
state->seqno = 0;
inflateReset(&state->strm);
}
/*
* Decompress a Deflate-compressed packet.
*
* Because of patent problems, we return DECOMP_ERROR for errors
* found by inspecting the input data and for system problems, but
* DECOMP_FATALERROR for any errors which could possibly be said to
* be being detected "after" decompression. For DECOMP_ERROR,
* we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
* infringing a patent of Motorola's if we do, so we take CCP down
* instead.
*
* Given that the frame has the correct sequence number and a good FCS,
* errors such as invalid codes in the input most likely indicate a
* bug, so we return DECOMP_FATALERROR for them in order to turn off
* compression, even though they are detected by inspecting the input.
*/
int
z_decompress(arg, mi, mop)
void *arg;
struct mbuf *mi, **mop;
{
struct deflate_state *state = (struct deflate_state *) arg;
struct mbuf *mo, *mo_head;
u_char *rptr, *wptr;
int rlen, olen, ospace;
int seq, i, flush, r, decode_proto;
u_char hdr[PPP_HDRLEN + DEFLATE_OVHD];
*mop = NULL;
rptr = mtod(mi, u_char *);
rlen = mi->m_len;
for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) {
while (rlen <= 0) {
mi = mi->m_next;
if (mi == NULL)
return DECOMP_ERROR;
rptr = mtod(mi, u_char *);
rlen = mi->m_len;
}
hdr[i] = *rptr++;
--rlen;
}
/* Check the sequence number. */
seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
if (seq != state->seqno) {
if (state->debug)
printf("z_decompress%d: bad seq # %d, expected %d\n",
state->unit, seq, state->seqno);
return DECOMP_ERROR;
}
++state->seqno;
/* Allocate an output mbuf. */
MGETHDR(mo, M_DONTWAIT, MT_DATA);
if (mo == NULL)
return DECOMP_ERROR;
mo_head = mo;
mo->m_len = 0;
mo->m_next = NULL;
MCLGET(mo, M_DONTWAIT);
ospace = M_TRAILINGSPACE(mo);
if (state->hdrlen + PPP_HDRLEN < ospace) {
mo->m_data += state->hdrlen;
ospace -= state->hdrlen;
}
/*
* Fill in the first part of the PPP header. The protocol field
* comes from the decompressed data.
*/
wptr = mtod(mo, u_char *);
wptr[0] = PPP_ADDRESS(hdr);
wptr[1] = PPP_CONTROL(hdr);
wptr[2] = 0;
/*
* Set up to call inflate. We set avail_out to 1 initially so we can
* look at the first byte of the output and decide whether we have
* a 1-byte or 2-byte protocol field.
*/
state->strm.next_in = rptr;
state->strm.avail_in = rlen;
mi = mi->m_next;
flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
rlen += PPP_HDRLEN + DEFLATE_OVHD;
state->strm.next_out = wptr + 3;
state->strm.avail_out = 1;
decode_proto = 1;
olen = PPP_HDRLEN;
/*
* Call inflate, supplying more input or output as needed.
*/
for (;;) {
r = inflate(&state->strm, flush);
if (r != Z_OK) {
if (state->debug)
printf("z_decompress%d: inflate returned %d (%s)\n",
state->unit, r, (state->strm.msg? state->strm.msg: ""));
m_freem(mo_head);
return DECOMP_FATALERROR;
}
if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
break; /* all done */
if (state->strm.avail_in == 0 && mi != NULL) {
state->strm.next_in = mtod(mi, u_char *);
state->strm.avail_in = mi->m_len;
rlen += mi->m_len;
mi = mi->m_next;
if (mi == NULL)
flush = Z_PACKET_FLUSH;
}
if (state->strm.avail_out == 0) {
if (decode_proto) {
state->strm.avail_out = ospace - PPP_HDRLEN;
if ((wptr[3] & 1) == 0) {
/* 2-byte protocol field */
wptr[2] = wptr[3];
--state->strm.next_out;
++state->strm.avail_out;
--olen;
}
decode_proto = 0;
} else {
mo->m_len = ospace;
olen += ospace;
MGET(mo->m_next, M_DONTWAIT, MT_DATA);
mo = mo->m_next;
if (mo == NULL) {
m_freem(mo_head);
return DECOMP_ERROR;
}
MCLGET(mo, M_DONTWAIT);
state->strm.next_out = mtod(mo, u_char *);
state->strm.avail_out = ospace = M_TRAILINGSPACE(mo);
}
}
}
if (decode_proto) {
m_freem(mo_head);
return DECOMP_ERROR;
}
olen += (mo->m_len = ospace - state->strm.avail_out);
state->stats.unc_bytes += olen;
state->stats.unc_packets++;
state->stats.comp_bytes += rlen;
state->stats.comp_packets++;
*mop = mo_head;
return DECOMP_OK;
}
/*
* Incompressible data has arrived - add it to the history.
*/
static void
z_incomp(arg, mi)
void *arg;
struct mbuf *mi;
{
struct deflate_state *state = (struct deflate_state *) arg;
u_char *rptr;
int rlen, proto, r;
/*
* Check that the protocol is one we handle.
*/
rptr = mtod(mi, u_char *);
proto = PPP_PROTOCOL(rptr);
if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
return;
++state->seqno;
/*
* Iterate through the mbufs, adding the characters in them
* to the decompressor's history. For the first mbuf, we start
* at the either the 1st or 2nd byte of the protocol field,
* depending on whether the protocol value is compressible.
*/
rlen = mi->m_len;
state->strm.next_in = rptr + 3;
state->strm.avail_in = rlen - 3;
if (proto > 0xff) {
--state->strm.next_in;
++state->strm.avail_in;
}
for (;;) {
r = inflateIncomp(&state->strm);
if (r != Z_OK) {
/* gak! */
if (state->debug) {
printf("z_incomp%d: inflateIncomp returned %d (%s)\n",
state->unit, r, (state->strm.msg? state->strm.msg: ""));
}
return;
}
mi = mi->m_next;
if (mi == NULL)
break;
state->strm.next_in = mtod(mi, u_char *);
state->strm.avail_in = mi->m_len;
rlen += mi->m_len;
}
/*
* Update stats.
*/
state->stats.inc_bytes += rlen;
state->stats.inc_packets++;
state->stats.unc_bytes += rlen;
state->stats.unc_packets++;
}
#endif /* DO_DEFLATE */

40
sys/net/ppp_tty.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ppp_tty.c,v 1.4 1996/02/13 22:00:30 christos Exp $ */
/* $NetBSD: ppp_tty.c,v 1.5 1996/03/15 02:28:10 paulus Exp $ */
/*
* ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
@ -104,6 +104,7 @@
#include <net/slcompress.h>
#endif
#include <net/bpf.h>
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#include <net/if_pppvar.h>
@ -226,7 +227,7 @@ pppclose(tp, flag)
int s;
s = spltty();
ttywflush(tp);
ttyflush(tp, FREAD|FWRITE);
tp->t_line = 0;
sc = (struct ppp_softc *) tp->t_sc;
if (sc != NULL) {
@ -570,7 +571,7 @@ pppstart(tp)
* the line may have been idle for some time.
*/
if (CCOUNT(&tp->t_outq) == 0) {
++sc->sc_bytessent;
++sc->sc_stats.ppp_obytes;
(void) putc(PPP_FLAG, &tp->t_outq);
}
@ -597,7 +598,7 @@ pppstart(tp)
ndone = n - b_to_q(start, n, &tp->t_outq);
len -= ndone;
start += ndone;
sc->sc_bytessent += ndone;
sc->sc_stats.ppp_obytes += ndone;
if (ndone < n)
break; /* packet doesn't fit */
@ -614,7 +615,7 @@ pppstart(tp)
(void) unputc(&tp->t_outq);
break;
}
sc->sc_bytessent += 2;
sc->sc_stats.ppp_obytes += 2;
start++;
len--;
}
@ -661,7 +662,7 @@ pppstart(tp)
unputc(&tp->t_outq);
break;
}
sc->sc_bytessent += q - endseq;
sc->sc_stats.ppp_obytes += q - endseq;
}
if (!done) {
@ -676,8 +677,6 @@ pppstart(tp)
m = m2;
if (m == NULL) {
/* Finished a packet */
sc->sc_if.if_opackets++;
sc->sc_if.if_obytes = sc->sc_bytessent;
break;
}
sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
@ -779,7 +778,7 @@ pppinput(c, tp)
s = spltty(); /* should be unnecessary */
++tk_nin;
++sc->sc_bytesrcvd;
++sc->sc_stats.ppp_ibytes;
if (c & TTY_FE) {
/* framing error or overrun on this char - abort packet */
@ -790,6 +789,25 @@ pppinput(c, tp)
c &= 0xff;
/*
* 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;
(*cdevsw[major(tp->t_dev)].d_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;
}
}
if (c & 0x80)
sc->sc_flags |= SC_RCV_B7_1;
else
@ -805,7 +823,6 @@ pppinput(c, tp)
if (c == PPP_FLAG) {
ilen = sc->sc_ilen;
sc->sc_ilen = 0;
sc->sc_if.if_ibytes = sc->sc_bytesrcvd;
if (sc->sc_rawin_count > 0)
ppplogchar(sc, -1);
@ -822,6 +839,7 @@ pppinput(c, tp)
printf("ppp%d: bad fcs %x\n", sc->sc_if.if_unit,
sc->sc_fcs);
sc->sc_if.if_ierrors++;
sc->sc_stats.ppp_ierrors++;
} else
sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
splx(s);
@ -833,6 +851,7 @@ pppinput(c, tp)
if (sc->sc_flags & SC_DEBUG)
printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
sc->sc_if.if_ierrors++;
sc->sc_stats.ppp_ierrors++;
sc->sc_flags |= SC_PKTLOST;
}
splx(s);
@ -974,6 +993,7 @@ pppinput(c, tp)
flush:
if (!(sc->sc_flags & SC_FLUSH)) {
sc->sc_if.if_ierrors++;
sc->sc_stats.ppp_ierrors++;
sc->sc_flags |= SC_FLUSH;
if (sc->sc_flags & SC_LOG_FLUSH)
ppplogchar(sc, c);

11
sys/net/slcompress.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: slcompress.c,v 1.14 1996/02/13 22:00:55 christos Exp $ */
/* $NetBSD: slcompress.c,v 1.15 1996/03/15 02:28:12 paulus Exp $ */
/*
* Copyright (c) 1989, 1993, 1994
@ -74,9 +74,14 @@ sl_compress_init(comp, max_state)
register u_int i;
register struct cstate *tstate = comp->tstate;
if (max_state == -1)
if (max_state == -1) {
max_state = MAX_STATES - 1;
bzero((char *)comp, sizeof(*comp));
bzero((char *)comp, sizeof(*comp));
} else {
/* Don't reset statistics */
bzero((char *)comp->tstate, sizeof(comp->tstate));
bzero((char *)comp->rstate, sizeof(comp->rstate));
}
for (i = max_state; i > 0; --i) {
tstate[i].cs_id = i;
tstate[i].cs_next = &tstate[i - 1];

4619
sys/net/zlib.c Normal file
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631
sys/net/zlib.h Normal file
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@ -0,0 +1,631 @@
/* $NetBSD: zlib.h,v 1.1 1996/03/15 02:28:17 paulus Exp $ */
/*
* This file is derived from zlib.h and zconf.h from the zlib-0.95
* distribution by Jean-loup Gailly and Mark Adler, with some additions
* by Paul Mackerras to aid in implementing Deflate compression and
* decompression for PPP packets.
*/
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 0.95, Aug 16th, 1995.
Copyright (C) 1995 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jean-loup Gailly Mark Adler
gzip@prep.ai.mit.edu madler@alumni.caltech.edu
*/
#ifndef _ZLIB_H
#define _ZLIB_H
/* #include "zconf.h" */ /* included directly here */
/* zconf.h -- configuration of the zlib compression library
* Copyright (C) 1995 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/* From: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp */
/*
The library does not install any signal handler. It is recommended to
add at least a handler for SIGSEGV when decompressing; the library checks
the consistency of the input data whenever possible but may go nuts
for some forms of corrupted input.
*/
/*
* Compile with -DMAXSEG_64K if the alloc function cannot allocate more
* than 64k bytes at a time (needed on systems with 16-bit int).
* Compile with -DUNALIGNED_OK if it is OK to access shorts or ints
* at addresses which are not a multiple of their size.
* Under DOS, -DFAR=far or -DFAR=__far may be needed.
*/
#ifndef STDC
# if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
# define STDC
# endif
#endif
#ifdef __MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
# include <unix.h>
#endif
/* Maximum value for memLevel in deflateInit2 */
#ifndef MAX_MEM_LEVEL
# ifdef MAXSEG_64K
# define MAX_MEM_LEVEL 8
# else
# define MAX_MEM_LEVEL 9
# endif
#endif
#ifndef FAR
# define FAR
#endif
/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
#ifndef MAX_WBITS
# define MAX_WBITS 15 /* 32K LZ77 window */
#endif
/* The memory requirements for deflate are (in bytes):
1 << (windowBits+2) + 1 << (memLevel+9)
that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values)
plus a few kilobytes for small objects. For example, if you want to reduce
the default memory requirements from 256K to 128K, compile with
make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
Of course this will generally degrade compression (there's no free lunch).
The memory requirements for inflate are (in bytes) 1 << windowBits
that is, 32K for windowBits=15 (default value) plus a few kilobytes
for small objects.
*/
/* Type declarations */
#ifndef OF /* function prototypes */
# ifdef STDC
# define OF(args) args
# else
# define OF(args) ()
# endif
#endif
typedef unsigned char Byte; /* 8 bits */
typedef unsigned int uInt; /* 16 bits or more */
typedef unsigned long uLong; /* 32 bits or more */
typedef Byte FAR Bytef;
typedef char FAR charf;
typedef int FAR intf;
typedef uInt FAR uIntf;
typedef uLong FAR uLongf;
#ifdef STDC
typedef void FAR *voidpf;
typedef void *voidp;
#else
typedef Byte FAR *voidpf;
typedef Byte *voidp;
#endif
/* end of original zconf.h */
#define ZLIB_VERSION "0.95P"
/*
The 'zlib' compression library provides in-memory compression and
decompression functions, including integrity checks of the uncompressed
data. This version of the library supports only one compression method
(deflation) but other algorithms may be added later and will have the same
stream interface.
For compression the application must provide the output buffer and
may optionally provide the input buffer for optimization. For decompression,
the application must provide the input buffer and may optionally provide
the output buffer for optimization.
Compression can be done in a single step if the buffers are large
enough (for example if an input file is mmap'ed), or can be done by
repeated calls of the compression function. In the latter case, the
application must provide more input and/or consume the output
(providing more output space) before each call.
*/
typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
typedef void (*free_func) OF((voidpf opaque, voidpf address, uInt nbytes));
struct internal_state;
typedef struct z_stream_s {
Bytef *next_in; /* next input byte */
uInt avail_in; /* number of bytes available at next_in */
uLong total_in; /* total nb of input bytes read so far */
Bytef *next_out; /* next output byte should be put there */
uInt avail_out; /* remaining free space at next_out */
uLong total_out; /* total nb of bytes output so far */
char *msg; /* last error message, NULL if no error */
struct internal_state FAR *state; /* not visible by applications */
alloc_func zalloc; /* used to allocate the internal state */
free_func zfree; /* used to free the internal state */
voidp opaque; /* private data object passed to zalloc and zfree */
Byte data_type; /* best guess about the data type: ascii or binary */
} z_stream;
/*
The application must update next_in and avail_in when avail_in has
dropped to zero. It must update next_out and avail_out when avail_out
has dropped to zero. The application must initialize zalloc, zfree and
opaque before calling the init function. All other fields are set by the
compression library and must not be updated by the application.
The opaque value provided by the application will be passed as the first
parameter for calls of zalloc and zfree. This can be useful for custom
memory management. The compression library attaches no meaning to the
opaque value.
zalloc must return Z_NULL if there is not enough memory for the object.
On 16-bit systems, the functions zalloc and zfree must be able to allocate
exactly 65536 bytes, but will not be required to allocate more than this
if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
pointers returned by zalloc for objects of exactly 65536 bytes *must*
have their offset normalized to zero. The default allocation function
provided by this library ensures this (see zutil.c). To reduce memory
requirements and avoid any allocation of 64K objects, at the expense of
compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
The fields total_in and total_out can be used for statistics or
progress reports. After compression, total_in holds the total size of
the uncompressed data and may be saved for use in the decompressor
(particularly if the decompressor wants to decompress everything in
a single step).
*/
/* constants */
#define Z_NO_FLUSH 0
#define Z_PARTIAL_FLUSH 1
#define Z_FULL_FLUSH 2
#define Z_SYNC_FLUSH 3 /* experimental: partial_flush + byte align */
#define Z_FINISH 4
#define Z_PACKET_FLUSH 5
/* See deflate() below for the usage of these constants */
#define Z_OK 0
#define Z_STREAM_END 1
#define Z_ERRNO (-1)
#define Z_STREAM_ERROR (-2)
#define Z_DATA_ERROR (-3)
#define Z_MEM_ERROR (-4)
#define Z_BUF_ERROR (-5)
/* error codes for the compression/decompression functions */
#define Z_BEST_SPEED 1
#define Z_BEST_COMPRESSION 9
#define Z_DEFAULT_COMPRESSION (-1)
/* compression levels */
#define Z_FILTERED 1
#define Z_HUFFMAN_ONLY 2
#define Z_DEFAULT_STRATEGY 0
#define Z_BINARY 0
#define Z_ASCII 1
#define Z_UNKNOWN 2
/* Used to set the data_type field */
#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
extern char *zlib_version;
/* The application can compare zlib_version and ZLIB_VERSION for consistency.
If the first character differs, the library code actually used is
not compatible with the zlib.h header file used by the application.
*/
/* basic functions */
extern int deflateInit OF((z_stream *strm, int level));
/*
Initializes the internal stream state for compression. The fields
zalloc, zfree and opaque must be initialized before by the caller.
If zalloc and zfree are set to Z_NULL, deflateInit updates them to
use default allocation functions.
The compression level must be Z_DEFAULT_COMPRESSION, or between 1 and 9:
1 gives best speed, 9 gives best compression. Z_DEFAULT_COMPRESSION requests
a default compromise between speed and compression (currently equivalent
to level 6).
deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
enough memory, Z_STREAM_ERROR if level is not a valid compression level.
msg is set to null if there is no error message. deflateInit does not
perform any compression: this will be done by deflate().
*/
extern int deflate OF((z_stream *strm, int flush));
/*
Performs one or both of the following actions:
- Compress more input starting at next_in and update next_in and avail_in
accordingly. If not all input can be processed (because there is not
enough room in the output buffer), next_in and avail_in are updated and
processing will resume at this point for the next call of deflate().
- Provide more output starting at next_out and update next_out and avail_out
accordingly. This action is forced if the parameter flush is non zero.
Forcing flush frequently degrades the compression ratio, so this parameter
should be set only when necessary (in interactive applications).
Some output may be provided even if flush is not set.
Before the call of deflate(), the application should ensure that at least
one of the actions is possible, by providing more input and/or consuming
more output, and updating avail_in or avail_out accordingly; avail_out
should never be zero before the call. The application can consume the
compressed output when it wants, for example when the output buffer is full
(avail_out == 0), or after each call of deflate().
If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
block is terminated and flushed to the output buffer so that the
decompressor can get all input data available so far. For method 9, a future
variant on method 8, the current block will be flushed but not terminated.
If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
special marker is output and the compression dictionary is discarded; this
is useful to allow the decompressor to synchronize if one compressed block
has been damaged (see inflateSync below). Flushing degrades compression and
so should be used only when necessary. Using Z_FULL_FLUSH too often can
seriously degrade the compression. If deflate returns with avail_out == 0,
this function must be called again with the same value of the flush
parameter and more output space (updated avail_out), until the flush is
complete (deflate returns with non-zero avail_out).
If the parameter flush is set to Z_PACKET_FLUSH, the compression
block is terminated, and a zero-length stored block is output,
omitting the length bytes (the effect of this is that the 3-bit type
code 000 for a stored block is output, and the output is then
byte-aligned). This is designed for use at the end of a PPP packet.
In addition, if the current compression block contains all the data
since the last Z_PACKET_FLUSH, it is never output as a stored block.
If the current compression block output as a static or dynamic block
would not be at least `minCompression' bytes smaller than the
original data, then nothing is output for that block. (The type
code for the zero-length stored block is still output, resulting in
a single zero byte being output for the whole packet.)
`MinCompression' is a parameter to deflateInit2, or 0 if deflateInit
is used.
If the parameter flush is set to Z_FINISH, all pending input is processed,
all pending output is flushed and deflate returns with Z_STREAM_END if there
was enough output space; if deflate returns with Z_OK, this function must be
called again with Z_FINISH and more output space (updated avail_out) but no
more input data, until it returns with Z_STREAM_END or an error. After
deflate has returned Z_STREAM_END, the only possible operations on the
stream are deflateReset or deflateEnd.
Z_FINISH can be used immediately after deflateInit if all the compression
is to be done in a single step. In this case, avail_out must be at least
0.1% larger than avail_in plus 12 bytes. If deflate does not return
Z_STREAM_END, then it must be called again as described above.
deflate() may update data_type if it can make a good guess about
the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
binary. This field is only for information purposes and does not affect
the compression algorithm in any manner.
deflate() returns Z_OK if some progress has been made (more input
processed or more output produced), Z_STREAM_END if all input has been
consumed and all output has been produced (only when flush is set to
Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible.
*/
extern int deflateEnd OF((z_stream *strm));
/*
All dynamically allocated data structures for this stream are freed.
This function discards any unprocessed input and does not flush any
pending output.
deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
stream state was inconsistent. In the error case, msg may be set
but then points to a static string (which must not be deallocated).
*/
extern int inflateInit OF((z_stream *strm));
/*
Initializes the internal stream state for decompression. The fields
zalloc and zfree must be initialized before by the caller. If zalloc and
zfree are set to Z_NULL, inflateInit updates them to use default allocation
functions.
inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
enough memory. msg is set to null if there is no error message.
inflateInit does not perform any decompression: this will be done by
inflate().
*/
extern int inflate OF((z_stream *strm, int flush));
/*
Performs one or both of the following actions:
- Decompress more input starting at next_in and update next_in and avail_in
accordingly. If not all input can be processed (because there is not
enough room in the output buffer), next_in is updated and processing
will resume at this point for the next call of inflate().
- Provide more output starting at next_out and update next_out and avail_out
accordingly. inflate() always provides as much output as possible
(until there is no more input data or no more space in the output buffer).
Before the call of inflate(), the application should ensure that at least
one of the actions is possible, by providing more input and/or consuming
more output, and updating the next_* and avail_* values accordingly.
The application can consume the uncompressed output when it wants, for
example when the output buffer is full (avail_out == 0), or after each
call of inflate().
If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH,
inflate flushes as much output as possible to the output buffer. The
flushing behavior of inflate is not specified for values of the flush
parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the
current implementation actually flushes as much output as possible
anyway. For Z_PACKET_FLUSH, inflate checks that once all the input data
has been consumed, it is expecting to see the length field of a stored
block; if not, it returns Z_DATA_ERROR.
inflate() should normally be called until it returns Z_STREAM_END or an
error. However if all decompression is to be performed in a single step
(a single call of inflate), the parameter flush should be set to
Z_FINISH. In this case all pending input is processed and all pending
output is flushed; avail_out must be large enough to hold all the
uncompressed data. (The size of the uncompressed data may have been saved
by the compressor for this purpose.) The next operation on this stream must
be inflateEnd to deallocate the decompression state. The use of Z_FINISH
is never required, but can be used to inform inflate that a faster routine
may be used for the single inflate() call.
inflate() returns Z_OK if some progress has been made (more input
processed or more output produced), Z_STREAM_END if the end of the
compressed data has been reached and all uncompressed output has been
produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
the stream structure was inconsistent (for example if next_in or next_out
was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
progress is possible or if there was not enough room in the output buffer
when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
call inflateSync to look for a good compression block. */
extern int inflateEnd OF((z_stream *strm));
/*
All dynamically allocated data structures for this stream are freed.
This function discards any unprocessed input and does not flush any
pending output.
inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
was inconsistent. In the error case, msg may be set but then points to a
static string (which must not be deallocated).
*/
/* advanced functions */
/*
The following functions are needed only in some special applications.
*/
extern int deflateInit2 OF((z_stream *strm,
int level,
int method,
int windowBits,
int memLevel,
int strategy,
int minCompression));
/*
This is another version of deflateInit with more compression options. The
fields next_in, zalloc and zfree must be initialized before by the caller.
The method parameter is the compression method. It must be 8 in this
version of the library. (Method 9 will allow a 64K history buffer and
partial block flushes.)
The windowBits parameter is the base two logarithm of the window size
(the size of the history buffer). It should be in the range 8..15 for this
version of the library (the value 16 will be allowed for method 9). Larger
values of this parameter result in better compression at the expense of
memory usage. The default value is 15 if deflateInit is used instead.
The memLevel parameter specifies how much memory should be allocated
for the internal compression state. memLevel=1 uses minimum memory but
is slow and reduces compression ratio; memLevel=9 uses maximum memory
for optimal speed. The default value is 8. See zconf.h for total memory
usage as a function of windowBits and memLevel.
The strategy parameter is used to tune the compression algorithm. Use
the value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data
produced by a filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman
encoding only (no string match). Filtered data consists mostly of small
values with a somewhat random distribution. In this case, the
compression algorithm is tuned to compress them better. The strategy
parameter only affects the compression ratio but not the correctness of
the compressed output even if it is not set appropriately.
The minCompression parameter specifies the minimum reduction in size
required for a compressed block to be output when Z_PACKET_FLUSH is
used (see the description of deflate above).
If next_in is not null, the library will use this buffer to hold also
some history information; the buffer must either hold the entire input
data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
is null, the library will allocate its own history buffer (and leave next_in
null). next_out need not be provided here but must be provided by the
application for the next call of deflate().
If the history buffer is provided by the application, next_in must
must never be changed by the application since the compressor maintains
information inside this buffer from call to call; the application
must provide more input only by increasing avail_in. next_in is always
reset by the library in this case.
deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
an invalid method). msg is set to null if there is no error message.
deflateInit2 does not perform any compression: this will be done by
deflate().
*/
extern int deflateCopy OF((z_stream *dest,
z_stream *source));
/*
Sets the destination stream as a complete copy of the source stream. If
the source stream is using an application-supplied history buffer, a new
buffer is allocated for the destination stream. The compressed output
buffer is always application-supplied. It's the responsibility of the
application to provide the correct values of next_out and avail_out for the
next call of deflate.
This function is useful when several compression strategies will be
tried, for example when there are several ways of pre-processing the input
data with a filter. The streams that will be discarded should then be freed
by calling deflateEnd. Note that deflateCopy duplicates the internal
compression state which can be quite large, so this strategy is slow and
can consume lots of memory.
deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
(such as zalloc being NULL). msg is left unchanged in both source and
destination.
*/
extern int deflateReset OF((z_stream *strm));
/*
This function is equivalent to deflateEnd followed by deflateInit,
but does not free and reallocate all the internal compression state.
The stream will keep the same compression level and any other attributes
that may have been set by deflateInit2.
deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
stream state was inconsistent (such as zalloc or state being NULL).
*/
extern int inflateInit2 OF((z_stream *strm,
int windowBits));
/*
This is another version of inflateInit with more compression options. The
fields next_out, zalloc and zfree must be initialized before by the caller.
The windowBits parameter is the base two logarithm of the maximum window
size (the size of the history buffer). It should be in the range 8..15 for
this version of the library (the value 16 will be allowed soon). The
default value is 15 if inflateInit is used instead. If a compressed stream
with a larger window size is given as input, inflate() will return with
the error code Z_DATA_ERROR instead of trying to allocate a larger window.
If next_out is not null, the library will use this buffer for the history
buffer; the buffer must either be large enough to hold the entire output
data, or have at least 1<<windowBits bytes. If next_out is null, the
library will allocate its own buffer (and leave next_out null). next_in
need not be provided here but must be provided by the application for the
next call of inflate().
If the history buffer is provided by the application, next_out must
never be changed by the application since the decompressor maintains
history information inside this buffer from call to call; the application
can only reset next_out to the beginning of the history buffer when
avail_out is zero and all output has been consumed.
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
windowBits < 8). msg is set to null if there is no error message.
inflateInit2 does not perform any decompression: this will be done by
inflate().
*/
extern int inflateSync OF((z_stream *strm));
/*
Skips invalid compressed data until the special marker (see deflate()
above) can be found, or until all available input is skipped. No output
is provided.
inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
if no more input was provided, Z_DATA_ERROR if no marker has been found,
or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
case, the application may save the current current value of total_in which
indicates where valid compressed data was found. In the error case, the
application may repeatedly call inflateSync, providing more input each time,
until success or end of the input data.
*/
extern int inflateReset OF((z_stream *strm));
/*
This function is equivalent to inflateEnd followed by inflateInit,
but does not free and reallocate all the internal decompression state.
The stream will keep attributes that may have been set by inflateInit2.
inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
stream state was inconsistent (such as zalloc or state being NULL).
*/
extern int inflateIncomp OF((z_stream *strm));
/*
This function adds the data at next_in (avail_in bytes) to the output
history without performing any output. There must be no pending output,
and the decompressor must be expecting to see the start of a block.
Calling this function is equivalent to decompressing a stored block
containing the data at next_in (except that the data is not output).
*/
/* checksum functions */
/*
This function is not related to compression but is exported
anyway because it might be useful in applications using the
compression library.
*/
extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
/*
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
return the updated checksum. If buf is NULL, this function returns
the required initial value for the checksum.
An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
much faster. Usage example:
uLong adler = adler32(0L, Z_NULL, 0);
while (read_buffer(buffer, length) != EOF) {
adler = adler32(adler, buffer, length);
}
if (adler != original_adler) error();
*/
#ifndef _Z_UTIL_H
struct internal_state {int dummy;}; /* hack for buggy compilers */
#endif
#endif /* _ZLIB_H */