--- /dev/null
+/*
+ * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Drew D. Perkins
+ * Carnegie Mellon University
+ * 4910 Forbes Ave.
+ * Pittsburgh, PA 15213
+ * (412) 268-8576
+ * ddp@andrew.cmu.edu
+ *
+ * Based on:
+ * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
+ *
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Serial Line interface
+ *
+ * Rick Adams
+ * Center for Seismic Studies
+ * 1300 N 17th Street, Suite 1450
+ * Arlington, Virginia 22209
+ * (703)276-7900
+ * rick@seismo.ARPA
+ * seismo!rick
+ *
+ * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
+ * Converted to 4.3BSD Beta by Chris Torek.
+ * Other changes made at Berkeley, based in part on code by Kirk Smith.
+ *
+ * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
+ * Added VJ tcp header compression; more unified ioctls
+ *
+ * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
+ * Cleaned up a lot of the mbuf-related code to fix bugs that
+ * caused system crashes and packet corruption. Changed pppstart
+ * so that it doesn't just give up with a collision if the whole
+ * packet doesn't fit in the output ring buffer.
+ *
+ * Added priority queueing for interactive IP packets, following
+ * the model of if_sl.c, plus hooks for bpf.
+ * Paul Mackerras (paulus@cs.anu.edu.au).
+ */
+
+/* $Id: if_ppp.c,v 1.1 1994/12/15 22:28:09 paulus Exp $ */
+/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
+
+#include "ppp.h"
+#if NPPP > 0
+
+#define VJC
+#define PPP_COMPRESS
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/kernel.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+#include <net/route.h>
+
+#if INET
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#endif
+
+#include "bpfilter.h"
+#if NBPFILTER > 0
+#include <sys/time.h>
+#include <net/bpf.h>
+#endif
+
+#ifdef VJC
+#include <net/pppcompress.h>
+#endif
+
+#include <net/ppp_defs.h>
+#include <net/if_ppp.h>
+#include <net/if_pppvar.h>
+#include <machine/cpu.h>
+
+#ifdef PPP_COMPRESS
+#define PACKETPTR struct mbuf *
+#include <net/ppp-comp.h>
+#endif
+
+void pppattach __P((void));
+int pppioctl __P((struct ppp_softc *sc, int cmd, caddr_t data, int flag,
+ struct proc *));
+int pppoutput __P((struct ifnet *ifp, struct mbuf *m0,
+ struct sockaddr *dst, struct rtentry *rtp));
+int pppsioctl __P((struct ifnet *ifp, int cmd, caddr_t data));
+void pppintr __P((void));
+
+static void ppp_requeue __P((struct ppp_softc *));
+static void ppp_outpkt __P((struct ppp_softc *));
+static int ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
+static void ppp_ccp_closed __P((struct ppp_softc *));
+static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
+static void pppdumpm __P((struct mbuf *m0));
+
+/*
+ * Some useful mbuf macros not in mbuf.h.
+ */
+#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
+
+#define M_DATASTART(m) \
+ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
+ (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
+
+#define M_DATASIZE(m) \
+ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
+ (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
+
+/*
+ * We steal two bits in the mbuf m_flags, to mark high-priority packets
+ * for output, and received packets following lost/corrupted packets.
+ */
+#define M_HIGHPRI 0x2000 /* output packet for sc_fastq */
+#define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */
+
+
+#ifdef PPP_COMPRESS
+/*
+ * List of compressors we know about.
+ * We leave some space so maybe we can modload compressors.
+ */
+
+extern struct compressor ppp_bsd_compress;
+
+struct compressor *ppp_compressors[8] = {
+ &ppp_bsd_compress,
+ NULL
+};
+#endif /* PPP_COMPRESS */
+
+TEXT_SET(pseudo_set, pppattach);
+
+/*
+ * Called from boot code to establish ppp interfaces.
+ */
+void
+pppattach()
+{
+ register struct ppp_softc *sc;
+ register int i = 0;
+ extern void (*netisrs[])__P((void));
+
+ for (sc = ppp_softc; i < NPPP; sc++) {
+ 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_type = IFT_PPP;
+ sc->sc_if.if_hdrlen = PPP_HDRLEN;
+ sc->sc_if.if_ioctl = pppsioctl;
+ sc->sc_if.if_output = pppoutput;
+ sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
+ if_attach(&sc->sc_if);
+#if NBPFILTER > 0
+ bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
+#endif
+ }
+ netisrs[NETISR_PPP] = ppp_intr;
+}
+
+/*
+ * Allocate a ppp interface unit and initialize it.
+ */
+struct ppp_softc *
+pppalloc(pid)
+ pid_t pid;
+{
+ int nppp, i;
+ struct ppp_softc *sc;
+
+ for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
+ if (sc->sc_xfer == pid) {
+ sc->sc_xfer = 0;
+ return sc;
+ }
+ for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
+ if (sc->sc_devp == NULL)
+ break;
+ if (nppp >= NPPP)
+ return NULL;
+
+ sc->sc_flags = 0;
+ sc->sc_mru = PPP_MRU;
+ sc->sc_relinq = NULL;
+#ifdef VJC
+ vj_compress_init(&sc->sc_comp, -1);
+#endif
+#ifdef PPP_COMPRESS
+ sc->sc_xc_state = NULL;
+ sc->sc_rc_state = NULL;
+#endif /* PPP_COMPRESS */
+ for (i = 0; i < NUM_NP; ++i)
+ sc->sc_npmode[i] = NPMODE_ERROR;
+ sc->sc_npqueue = NULL;
+ sc->sc_npqtail = &sc->sc_npqueue;
+ sc->sc_last_sent = sc->sc_last_recv = time.tv_sec;
+
+ return sc;
+}
+
+/*
+ * Deallocate a ppp unit. Must be called at splnet or higher.
+ */
+void
+pppdealloc(sc)
+ struct ppp_softc *sc;
+{
+ struct mbuf *m;
+
+ if_down(&sc->sc_if);
+ sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
+ sc->sc_devp = NULL;
+ sc->sc_xfer = 0;
+ for (;;) {
+ IF_DEQUEUE(&sc->sc_rawq, m);
+ if (m == NULL)
+ break;
+ m_freem(m);
+ }
+ for (;;) {
+ IF_DEQUEUE(&sc->sc_inq, m);
+ if (m == NULL)
+ break;
+ m_freem(m);
+ }
+ for (;;) {
+ IF_DEQUEUE(&sc->sc_fastq, m);
+ if (m == NULL)
+ break;
+ m_freem(m);
+ }
+ while ((m = sc->sc_npqueue) != NULL) {
+ sc->sc_npqueue = m->m_nextpkt;
+ m_freem(m);
+ }
+ if (sc->sc_togo != NULL) {
+ m_freem(sc->sc_togo);
+ sc->sc_togo = NULL;
+ }
+#ifdef PPP_COMPRESS
+ ppp_ccp_closed(sc);
+ sc->sc_xc_state = NULL;
+ sc->sc_rc_state = NULL;
+#endif /* PPP_COMPRESS */
+}
+
+/*
+ * Ioctl routine for generic ppp devices.
+ */
+int
+pppioctl(sc, cmd, data, flag, p)
+ struct ppp_softc *sc;
+ caddr_t data;
+ int cmd, flag;
+ struct proc *p;
+{
+ int s, error, flags, mru, nb, npx;
+ struct ppp_option_data *odp;
+ struct compressor **cp;
+ struct npioctl *npi;
+ time_t t;
+#ifdef PPP_COMPRESS
+ u_char ccp_option[CCP_MAX_OPTION_LENGTH];
+#endif
+
+ switch (cmd) {
+ case FIONREAD:
+ *(int *)data = sc->sc_inq.ifq_len;
+ break;
+
+ case PPPIOCGUNIT:
+ *(int *)data = sc->sc_if.if_unit;
+ break;
+
+ case PPPIOCGFLAGS:
+ *(u_int *)data = sc->sc_flags;
+ break;
+
+ case PPPIOCSFLAGS:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ flags = *(int *)data & SC_MASK;
+ s = splnet();
+#ifdef PPP_COMPRESS
+ if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
+ ppp_ccp_closed(sc);
+#endif
+ splimp();
+ sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
+ splx(s);
+ break;
+
+ case PPPIOCSMRU:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ mru = *(int *)data;
+ if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
+ sc->sc_mru = mru;
+ break;
+
+ case PPPIOCGMRU:
+ *(int *)data = sc->sc_mru;
+ break;
+
+#ifdef VJC
+ case PPPIOCSMAXCID:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ s = splnet();
+ vj_compress_init(&sc->sc_comp, *(int *)data);
+ splx(s);
+ break;
+#endif
+
+ case PPPIOCXFERUNIT:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ sc->sc_xfer = p->p_pid;
+ break;
+
+#ifdef PPP_COMPRESS
+ case PPPIOCSCOMPRESS:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ odp = (struct ppp_option_data *) data;
+ nb = odp->length;
+ if (nb > sizeof(ccp_option))
+ nb = sizeof(ccp_option);
+ if (error = copyin(odp->ptr, ccp_option, nb))
+ return (error);
+ if (ccp_option[1] < 2) /* preliminary check on the length byte */
+ return (EINVAL);
+ for (cp = ppp_compressors; *cp != NULL; ++cp)
+ if ((*cp)->compress_proto == ccp_option[0]) {
+ /*
+ * Found a handler for the protocol - try to allocate
+ * a compressor or decompressor.
+ */
+ error = 0;
+ s = splnet();
+ if (odp->transmit) {
+ if (sc->sc_xc_state != NULL)
+ (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
+ sc->sc_xcomp = *cp;
+ sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
+ if (sc->sc_xc_state == NULL) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: comp_alloc failed\n",
+ sc->sc_if.if_unit);
+ error = ENOBUFS;
+ }
+ splimp();
+ sc->sc_flags &= ~SC_COMP_RUN;
+ } else {
+ if (sc->sc_rc_state != NULL)
+ (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
+ sc->sc_rcomp = *cp;
+ sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
+ if (sc->sc_rc_state == NULL) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: decomp_alloc failed\n",
+ sc->sc_if.if_unit);
+ error = ENOBUFS;
+ }
+ splimp();
+ sc->sc_flags &= ~SC_DECOMP_RUN;
+ }
+ splx(s);
+ return (error);
+ }
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: no compressor for [%x %x %x], %x\n",
+ sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
+ ccp_option[2], nb);
+ return (EINVAL); /* no handler found */
+#endif /* PPP_COMPRESS */
+
+ case PPPIOCGNPMODE:
+ case PPPIOCSNPMODE:
+ npi = (struct npioctl *) data;
+ switch (npi->protocol) {
+ case PPP_IP:
+ npx = NP_IP;
+ break;
+ default:
+ return EINVAL;
+ }
+ if (cmd == PPPIOCGNPMODE) {
+ npi->mode = sc->sc_npmode[npx];
+ } else {
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+ if (npi->mode != sc->sc_npmode[npx]) {
+ s = splimp();
+ sc->sc_npmode[npx] = npi->mode;
+ if (npi->mode != NPMODE_QUEUE) {
+ ppp_requeue(sc);
+ (*sc->sc_start)(sc);
+ }
+ splx(s);
+ }
+ }
+ break;
+
+ case PPPIOCGIDLE:
+ s = splimp();
+ t = time.tv_sec;
+ ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
+ ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
+ splx(s);
+ break;
+
+ default:
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * Process an ioctl request to the ppp network interface.
+ */
+int
+pppsioctl(ifp, cmd, data)
+ register struct ifnet *ifp;
+ int cmd;
+ caddr_t data;
+{
+ struct proc *p = curproc; /* XXX */
+ register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
+ register struct ifaddr *ifa = (struct ifaddr *)data;
+ register struct ifreq *ifr = (struct ifreq *)data;
+ struct ppp_stats *psp;
+#ifdef PPP_COMPRESS
+ struct ppp_comp_stats *pcp;
+#endif
+ int s = splimp(), error = 0;
+
+ switch (cmd) {
+ case SIOCSIFFLAGS:
+ if ((ifp->if_flags & IFF_RUNNING) == 0)
+ ifp->if_flags &= ~IFF_UP;
+ break;
+
+ case SIOCSIFADDR:
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ error = EAFNOSUPPORT;
+ break;
+
+ case SIOCSIFDSTADDR:
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ error = EAFNOSUPPORT;
+ break;
+
+ case SIOCSIFMTU:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ break;
+ sc->sc_if.if_mtu = ifr->ifr_mtu;
+ break;
+
+ case SIOCGIFMTU:
+ ifr->ifr_mtu = sc->sc_if.if_mtu;
+ 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;
+#endif /* VJC */
+ break;
+
+#ifdef PPP_COMPRESS
+ case SIOCGPPPCSTATS:
+ pcp = &((struct ifpppcstatsreq *) data)->stats;
+ bzero(pcp, sizeof(*pcp));
+ if (sc->sc_xc_state != NULL)
+ (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
+ if (sc->sc_rc_state != NULL)
+ (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
+ break;
+#endif /* PPP_COMPRESS */
+
+ default:
+ error = EINVAL;
+ }
+ splx(s);
+ return (error);
+}
+
+/*
+ * Queue a packet. Start transmission if not active.
+ * Packet is placed in Information field of PPP frame.
+ */
+int
+pppoutput(ifp, m0, dst, rtp)
+ struct ifnet *ifp;
+ struct mbuf *m0;
+ struct sockaddr *dst;
+ struct rtentry *rtp;
+{
+ register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
+ struct ppp_header *ph;
+ int protocol, address, control;
+ u_char *cp;
+ int s, error;
+ struct ip *ip;
+ struct ifqueue *ifq;
+ enum NPmode mode;
+
+ if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
+ || (ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC) {
+ error = ENETDOWN; /* sort of */
+ goto bad;
+ }
+
+ /*
+ * Compute PPP header.
+ */
+ m0->m_flags &= ~M_HIGHPRI;
+ switch (dst->sa_family) {
+#ifdef INET
+ case AF_INET:
+ address = PPP_ALLSTATIONS;
+ control = PPP_UI;
+ protocol = PPP_IP;
+ mode = sc->sc_npmode[NP_IP];
+
+ /*
+ * If this packet has the "low delay" bit set in the IP header,
+ * put it on the fastq instead.
+ */
+ ip = mtod(m0, struct ip *);
+ if (ip->ip_tos & IPTOS_LOWDELAY)
+ m0->m_flags |= M_HIGHPRI;
+ break;
+#endif
+ case AF_UNSPEC:
+ address = PPP_ADDRESS(dst->sa_data);
+ control = PPP_CONTROL(dst->sa_data);
+ protocol = PPP_PROTOCOL(dst->sa_data);
+ mode = NPMODE_PASS;
+ break;
+ default:
+ printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
+ error = EAFNOSUPPORT;
+ goto bad;
+ }
+
+ /*
+ * Drop this packet, or return an error, if necessary.
+ */
+ if (mode == NPMODE_ERROR) {
+ error = ENETDOWN;
+ goto bad;
+ }
+ if (mode == NPMODE_DROP) {
+ error = 0;
+ goto bad;
+ }
+
+ /*
+ * Add PPP header. If no space in first mbuf, allocate another.
+ * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
+ */
+ if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
+ m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT);
+ if (m0 == 0) {
+ error = ENOBUFS;
+ goto bad;
+ }
+ m0->m_len = 0;
+ } else
+ m0->m_data -= PPP_HDRLEN;
+
+ cp = mtod(m0, u_char *);
+ *cp++ = address;
+ *cp++ = control;
+ *cp++ = protocol >> 8;
+ *cp++ = protocol & 0xff;
+ m0->m_len += PPP_HDRLEN;
+
+ if (sc->sc_flags & SC_LOG_OUTPKT) {
+ printf("ppp%d output: ", ifp->if_unit);
+ pppdumpm(m0);
+ }
+
+#if NBPFILTER > 0
+ /*
+ * See if bpf wants to look at the packet.
+ */
+ if (sc->sc_bpf)
+ bpf_mtap(sc->sc_bpf, m0);
+#endif
+
+ /*
+ * Put the packet on the appropriate queue.
+ */
+ s = splimp(); /* splnet should be OK now */
+ if (mode == NPMODE_QUEUE) {
+ /* XXX we should limit the number of packets on this queue */
+ *sc->sc_npqtail = m0;
+ m0->m_nextpkt = NULL;
+ sc->sc_npqtail = &m0->m_nextpkt;
+ } else {
+ ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd;
+ if (IF_QFULL(ifq)) {
+ IF_DROP(ifq);
+ splx(s);
+ sc->sc_if.if_oerrors++;
+ error = ENOBUFS;
+ goto bad;
+ }
+ IF_ENQUEUE(ifq, m0);
+ (*sc->sc_start)(sc);
+ }
+
+ splx(s);
+ return (0);
+
+bad:
+ m_freem(m0);
+ return (error);
+}
+
+/*
+ * After a change in the NPmode for some NP, move packets from the
+ * npqueue to the send queue or the fast queue as appropriate.
+ * Should be called at splimp (actually splnet would probably suffice).
+ */
+static void
+ppp_requeue(sc)
+ struct ppp_softc *sc;
+{
+ struct mbuf *m, **mpp;
+ struct ifqueue *ifq;
+ enum NPmode mode;
+
+ for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
+ switch (PPP_PROTOCOL(mtod(m, u_char *))) {
+ case PPP_IP:
+ mode = sc->sc_npmode[NP_IP];
+ break;
+ default:
+ mode = NPMODE_PASS;
+ }
+
+ switch (mode) {
+ case NPMODE_PASS:
+ /*
+ * This packet can now go on one of the queues to be sent.
+ */
+ *mpp = m->m_nextpkt;
+ m->m_nextpkt = NULL;
+ ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd;
+ if (IF_QFULL(ifq)) {
+ IF_DROP(ifq);
+ sc->sc_if.if_oerrors++;
+ } else
+ IF_ENQUEUE(ifq, m);
+ break;
+
+ case NPMODE_DROP:
+ case NPMODE_ERROR:
+ *mpp = m->m_nextpkt;
+ m_freem(m);
+ break;
+
+ case NPMODE_QUEUE:
+ mpp = &m->m_nextpkt;
+ break;
+ }
+ }
+ sc->sc_npqtail = mpp;
+}
+
+/*
+ * Get a packet to send. This procedure is intended to be called
+ * at spltty()/splimp(), so it takes little time. If there isn't
+ * a packet waiting to go out, it schedules a software interrupt
+ * to prepare a new packet; the device start routine gets called
+ * again when a packet is ready.
+ */
+struct mbuf *
+ppp_dequeue(sc)
+ struct ppp_softc *sc;
+{
+ struct mbuf *m;
+ int s = splimp();
+
+ m = sc->sc_togo;
+ if (m) {
+ /*
+ * Had a packet waiting - send it.
+ */
+ sc->sc_togo = NULL;
+ sc->sc_flags |= SC_TBUSY;
+ splx(s);
+ return m;
+ }
+ /*
+ * Remember we wanted a packet and schedule a software interrupt.
+ */
+ sc->sc_flags &= ~SC_TBUSY;
+ schednetisr(NETISR_PPP);
+ splx(s);
+ return NULL;
+}
+
+/*
+ * Software interrupt routine, called at splnet().
+ */
+void
+pppintr()
+{
+ struct ppp_softc *sc;
+ int i, s;
+ struct mbuf *m;
+
+ s = splnet();
+ sc = ppp_softc;
+ for (i = 0; i < NPPP; ++i, ++sc) {
+ if (!(sc->sc_flags & SC_TBUSY) && sc->sc_togo == NULL
+ && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head))
+ ppp_outpkt(sc);
+ for (;;) {
+ IF_DEQUEUE(&sc->sc_rawq, m);
+ if (m == NULL)
+ break;
+ ppp_inproc(sc, m);
+ }
+ }
+ splx(s);
+}
+
+/*
+ * Grab another packet off a queue and apply VJ compression,
+ * packet compression, address/control and/or protocol compression
+ * if enabled. Should be called at splnet.
+ */
+static void
+ppp_outpkt(sc)
+ struct ppp_softc *sc;
+{
+ int s;
+ struct mbuf *m, *mp;
+ u_char *cp;
+ int address, control, protocol;
+ enum NPmode mode;
+
+ /*
+ * Grab a packet to send: first try the fast queue, then the
+ * normal queue.
+ */
+ IF_DEQUEUE(&sc->sc_fastq, m);
+ if (m == NULL)
+ IF_DEQUEUE(&sc->sc_if.if_snd, m);
+ if (m == NULL)
+ return;
+
+ /*
+ * Extract the ppp header of the new packet.
+ * The ppp header will be in one mbuf.
+ */
+ cp = mtod(m, u_char *);
+ address = PPP_ADDRESS(cp);
+ control = PPP_CONTROL(cp);
+ protocol = PPP_PROTOCOL(cp);
+
+ 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) {
+ struct ip *ip;
+ int type;
+
+ mp = m;
+ ip = (struct ip *) (cp + PPP_HDRLEN);
+ if (mp->m_len <= PPP_HDRLEN) {
+ mp = mp->m_next;
+ if (mp == NULL)
+ break;
+ ip = mtod(mp, struct ip *);
+ }
+ /* this code assumes the IP/TCP header is in one non-shared mbuf */
+ if (ip->ip_p == IPPROTO_TCP) {
+ type = vj_compress_tcp(mp, ip, &sc->sc_comp,
+ !(sc->sc_flags & SC_NO_TCP_CCID));
+ switch (type) {
+ case TYPE_UNCOMPRESSED_TCP:
+ protocol = PPP_VJC_UNCOMP;
+ break;
+ case TYPE_COMPRESSED_TCP:
+ protocol = PPP_VJC_COMP;
+ cp = mtod(m, u_char *);
+ cp[0] = address; /* header has moved */
+ cp[1] = control;
+ cp[2] = 0;
+ break;
+ }
+ cp[3] = protocol; /* update protocol in PPP header */
+ }
+ }
+#endif /* VJC */
+ break;
+
+#ifdef PPP_COMPRESS
+ case PPP_CCP:
+ ppp_ccp(sc, m, 0);
+ break;
+#endif /* PPP_COMPRESS */
+ }
+
+#ifdef PPP_COMPRESS
+ if (protocol != PPP_LCP && protocol != PPP_CCP
+ && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
+ struct mbuf *mcomp;
+ int slen, clen;
+
+ slen = 0;
+ for (mp = m; mp != NULL; mp = mp->m_next)
+ slen += mp->m_len;
+ clen = (*sc->sc_xcomp->compress)
+ (sc->sc_xc_state, &mcomp, m, slen,
+ (sc->sc_flags & SC_CCP_UP? sc->sc_if.if_mtu: 0));
+ if (mcomp != NULL) {
+ m_freem(m);
+ m = mcomp;
+ cp = mtod(m, u_char *);
+ protocol = cp[3];
+ }
+ }
+#endif /* PPP_COMPRESS */
+
+ /*
+ * Compress the address/control and protocol, if possible.
+ */
+ if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
+ control == PPP_UI && protocol != PPP_ALLSTATIONS &&
+ protocol != PPP_LCP) {
+ /* can compress address/control */
+ m->m_data += 2;
+ m->m_len -= 2;
+ }
+ if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
+ /* can compress protocol */
+ if (mtod(m, u_char *) == cp) {
+ cp[2] = cp[1]; /* move address/control up */
+ cp[1] = cp[0];
+ }
+ ++m->m_data;
+ --m->m_len;
+ }
+
+ s = splimp();
+ sc->sc_togo = m;
+ (*sc->sc_start)(sc);
+ splx(s);
+}
+
+#ifdef PPP_COMPRESS
+/*
+ * Handle a CCP packet. `rcvd' is 1 if the packet was received,
+ * 0 if it is about to be transmitted.
+ */
+static int
+ppp_ccp(sc, m, rcvd)
+ struct ppp_softc *sc;
+ struct mbuf *m;
+ int rcvd;
+{
+ u_char *dp, *ep;
+ struct mbuf *mp;
+ int slen, s;
+
+ /*
+ * Get a pointer to the data after the PPP header.
+ */
+ if (m->m_len <= PPP_HDRLEN) {
+ mp = m->m_next;
+ if (mp == NULL)
+ return;
+ dp = (mp != NULL)? mtod(mp, u_char *): NULL;
+ } else {
+ mp = m;
+ dp = mtod(mp, u_char *) + PPP_HDRLEN;
+ }
+
+ ep = mtod(mp, u_char *) + mp->m_len;
+ if (dp + CCP_HDRLEN > ep)
+ return;
+ slen = CCP_LENGTH(dp);
+ if (dp + slen > ep) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("if_ppp/ccp: not enough data in mbuf (%x+%x > %x+%x)\n",
+ dp, slen, mtod(mp, u_char *), mp->m_len);
+ return;
+ }
+
+ switch (CCP_CODE(dp)) {
+ case CCP_CONFREQ:
+ case CCP_TERMREQ:
+ case CCP_TERMACK:
+ /* CCP must be going down - disable compression */
+ if (sc->sc_flags & SC_CCP_UP) {
+ s = splimp();
+ sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
+ splx(s);
+ }
+ break;
+
+ case CCP_CONFACK:
+ if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
+ && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
+ && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
+ if (!rcvd) {
+ /* we're agreeing to send compressed packets. */
+ if (sc->sc_xc_state != NULL
+ && (*sc->sc_xcomp->comp_init)
+ (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
+ sc->sc_if.if_unit, sc->sc_flags & SC_DEBUG)) {
+ s = splimp();
+ sc->sc_flags |= SC_COMP_RUN;
+ splx(s);
+ }
+ } else {
+ /* peer is agreeing to send compressed packets. */
+ if (sc->sc_rc_state != NULL
+ && (*sc->sc_rcomp->decomp_init)
+ (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
+ sc->sc_if.if_unit, 0, sc->sc_mru,
+ sc->sc_flags & SC_DEBUG)) {
+ s = splimp();
+ sc->sc_flags |= SC_DECOMP_RUN;
+ sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
+ splx(s);
+ }
+ }
+ }
+ break;
+
+ case CCP_RESETACK:
+ if (sc->sc_flags & SC_CCP_UP) {
+ if (!rcvd) {
+ if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
+ (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
+ } else {
+ if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
+ (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
+ s = splimp();
+ sc->sc_flags &= ~SC_DC_ERROR;
+ splx(s);
+ }
+ }
+ }
+ break;
+ }
+}
+
+/*
+ * CCP is down; free (de)compressor state if necessary.
+ */
+static void
+ppp_ccp_closed(sc)
+ struct ppp_softc *sc;
+{
+ if (sc->sc_xc_state) {
+ (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
+ sc->sc_xc_state = NULL;
+ }
+ if (sc->sc_rc_state) {
+ (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
+ sc->sc_rc_state = NULL;
+ }
+}
+#endif /* PPP_COMPRESS */
+
+/*
+ * PPP packet input routine.
+ * The caller has checked and removed the FCS and has inserted
+ * the address/control bytes and the protocol high byte if they
+ * were omitted.
+ */
+void
+ppppktin(sc, m, lost)
+ struct ppp_softc *sc;
+ struct mbuf *m;
+ int lost;
+{
+ int s = splimp();
+
+ if (lost)
+ m->m_flags |= M_ERRMARK;
+ IF_ENQUEUE(&sc->sc_rawq, m);
+ schednetisr(NETISR_PPP);
+ splx(s);
+}
+
+/*
+ * Process a received PPP packet, doing decompression as necessary.
+ */
+#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
+ TYPE_UNCOMPRESSED_TCP)
+
+static void
+ppp_inproc(sc, m)
+ struct ppp_softc *sc;
+ struct mbuf *m;
+{
+ struct ifqueue *inq;
+ int s, ilen, xlen, proto, rv;
+ u_char *cp, adrs, ctrl;
+ struct mbuf *mp, *dmp;
+ u_char *iphdr;
+ u_int hlen;
+
+ sc->sc_if.if_ipackets++;
+
+ if (sc->sc_flags & SC_LOG_INPKT) {
+ printf("ppp%d: got %d bytes\n", sc->sc_if.if_unit, ilen);
+ pppdumpm(m);
+ }
+
+ cp = mtod(m, u_char *);
+ adrs = PPP_ADDRESS(cp);
+ ctrl = PPP_CONTROL(cp);
+ proto = PPP_PROTOCOL(cp);
+
+ if (m->m_flags & M_ERRMARK) {
+ m->m_flags &= ~M_ERRMARK;
+ s = splimp();
+ sc->sc_flags |= SC_VJ_RESET;
+ splx(s);
+ }
+
+#ifdef PPP_COMPRESS
+ /*
+ * Decompress this packet if necessary, update the receiver's
+ * dictionary, or take appropriate action on a CCP packet.
+ */
+ if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
+ && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
+ /* decompress this packet */
+ rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
+ if (dmp != NULL) {
+ m_freem(m);
+ m = dmp;
+ cp = mtod(m, u_char *);
+ proto = PPP_PROTOCOL(cp);
+
+ } else {
+ /* pass the compressed packet up to pppd, which may take
+ CCP down or issue a Reset-Req. */
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: decompress failed %d\n", sc->sc_if.if_unit, rv);
+ s = splimp();
+ sc->sc_flags |= SC_VJ_RESET;
+ switch (rv) {
+ case DECOMP_OK:
+ /* no error, but no decompressed packet produced */
+ splx(s);
+ m_freem(m);
+ return;
+ case DECOMP_ERROR:
+ sc->sc_flags |= SC_DC_ERROR;
+ break;
+ case DECOMP_FATALERROR:
+ sc->sc_flags |= SC_DC_FERROR;
+ break;
+ }
+ splx(s);
+ }
+
+ } else {
+ if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
+ (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
+ }
+ if (proto == PPP_CCP) {
+ ppp_ccp(sc, m, 1);
+ }
+ }
+#endif
+
+ ilen = 0;
+ for (mp = m; mp != NULL; mp = mp->m_next)
+ ilen += mp->m_len;
+
+#ifdef VJC
+ if (sc->sc_flags & SC_VJ_RESET) {
+ /*
+ * If we've missed a packet, we must toss subsequent compressed
+ * packets which don't have an explicit connection ID.
+ */
+ vj_uncompress_tcp(NULL, 0, TYPE_ERROR, &sc->sc_comp);
+ s = splimp();
+ sc->sc_flags &= ~SC_VJ_RESET;
+ splx(s);
+ }
+
+ /*
+ * See if we have a VJ-compressed packet to uncompress.
+ */
+ if (proto == PPP_VJC_COMP) {
+ if (sc->sc_flags & SC_REJ_COMP_TCP)
+ goto bad;
+
+ xlen = vj_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
+ ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
+ &sc->sc_comp, &iphdr, &hlen);
+
+ if (xlen <= 0) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: VJ uncompress failed on type comp\n",
+ sc->sc_if.if_unit);
+ goto bad;
+ }
+
+ /* Copy the PPP and IP headers into a new mbuf. */
+ MGETHDR(mp, M_DONTWAIT, MT_DATA);
+ if (mp == NULL)
+ goto bad;
+ mp->m_len = 0;
+ mp->m_next = NULL;
+ if (hlen + PPP_HDRLEN > MHLEN) {
+ MCLGET(mp, M_DONTWAIT);
+ if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
+ m_freem(mp);
+ goto bad; /* lose if big headers and no clusters */
+ }
+ }
+ cp = mtod(mp, u_char *);
+ cp[0] = adrs;
+ cp[1] = ctrl;
+ cp[2] = 0;
+ cp[3] = PPP_IP;
+ proto = PPP_IP;
+ bcopy(iphdr, cp + PPP_HDRLEN, hlen);
+ mp->m_len = hlen + PPP_HDRLEN;
+
+ /*
+ * Trim the PPP and VJ headers off the old mbuf
+ * and stick the new and old mbufs together.
+ */
+ m->m_data += PPP_HDRLEN + xlen;
+ m->m_len -= PPP_HDRLEN + xlen;
+ if (m->m_len <= M_TRAILINGSPACE(mp)) {
+ bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
+ mp->m_len += m->m_len;
+ MFREE(m, mp->m_next);
+ } else
+ mp->m_next = m;
+ m = mp;
+ ilen += hlen - xlen;
+
+ } else if (proto == PPP_VJC_UNCOMP) {
+ if (sc->sc_flags & SC_REJ_COMP_TCP)
+ goto bad;
+
+ xlen = vj_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
+ ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
+ &sc->sc_comp, &iphdr, &hlen);
+
+ if (xlen < 0) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: VJ uncompress failed on type uncomp\n",
+ sc->sc_if.if_unit);
+ goto bad;
+ }
+
+ proto = PPP_IP;
+ cp[3] = PPP_IP;
+ }
+#endif /* VJC */
+
+ /*
+ * If the packet will fit in a header mbuf, don't waste a
+ * whole cluster on it.
+ */
+ if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
+ MGETHDR(mp, M_DONTWAIT, MT_DATA);
+ if (mp != NULL) {
+ m_copydata(m, 0, ilen, mtod(mp, caddr_t));
+ m_freem(m);
+ m = mp;
+ m->m_len = ilen;
+ }
+ }
+ m->m_pkthdr.len = ilen;
+ m->m_pkthdr.rcvif = &sc->sc_if;
+
+#if NBPFILTER > 0
+ /* See if bpf wants to look at the packet. */
+ if (sc->sc_bpf)
+ bpf_mtap(sc->sc_bpf, m);
+#endif
+
+ rv = 0;
+ switch (proto) {
+#ifdef INET
+ case PPP_IP:
+ /*
+ * IP packet - take off the ppp header and pass it up to IP.
+ */
+ if ((sc->sc_if.if_flags & IFF_UP) == 0
+ || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
+ /* interface is down - drop the packet. */
+ m_freem(m);
+ return;
+ }
+ m->m_pkthdr.len -= PPP_HDRLEN;
+ m->m_data += PPP_HDRLEN;
+ 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
+
+ default:
+ /*
+ * Some other protocol - place on input queue for read().
+ */
+ inq = &sc->sc_inq;
+ rv = 1;
+ break;
+ }
+
+ /*
+ * Put the packet on the appropriate input queue.
+ */
+ s = splimp();
+ if (IF_QFULL(inq)) {
+ IF_DROP(inq);
+ splx(s);
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: input queue full\n", sc->sc_if.if_unit);
+ sc->sc_if.if_iqdrops++;
+ goto bad;
+ }
+ IF_ENQUEUE(inq, m);
+ splx(s);
+
+ if (rv)
+ (*sc->sc_ctlp)(sc);
+
+ return;
+
+ bad:
+ m_freem(m);
+ sc->sc_if.if_ierrors++;
+}
+
+#define MAX_DUMP_BYTES 128
+
+static void
+pppdumpm(m0)
+ struct mbuf *m0;
+{
+ char buf[3*MAX_DUMP_BYTES+4];
+ char *bp = buf;
+ struct mbuf *m;
+ static char digits[] = "0123456789abcdef";
+
+ for (m = m0; m; m = m->m_next) {
+ int l = m->m_len;
+ u_char *rptr = (u_char *)m->m_data;
+
+ while (l--) {
+ if (bp > buf + sizeof(buf) - 4)
+ goto done;
+ *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
+ *bp++ = digits[*rptr++ & 0xf];
+ }
+
+ if (m->m_next) {
+ if (bp > buf + sizeof(buf) - 3)
+ goto done;
+ *bp++ = '|';
+ } else
+ *bp++ = ' ';
+ }
+done:
+ if (m)
+ *bp++ = '>';
+ *bp = 0;
+ printf("%s\n", buf);
+}
+
+#endif /* NPPP > 0 */
--- /dev/null
+/* $Id: if_pppvar.h,v 1.1 1994/12/15 22:28:09 paulus Exp $ */
+/*
+ * if_pppvar.h - private structures and declarations for PPP.
+ *
+ * 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 HAVE 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.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+ * Supported network protocols. These values are used for
+ * indexing sc_npmode.
+ */
+#define NP_IP 0 /* Internet Protocol */
+#define NUM_NP 1 /* Number of NPs. */
+
+/*
+ * Structure describing each ppp unit.
+ */
+struct ppp_softc {
+ struct ifnet sc_if; /* network-visible interface */
+ u_int sc_flags; /* control/status bits; see if_ppp.h */
+ void *sc_devp; /* pointer to device-dep structure */
+ void (*sc_start) __P((struct ppp_softc *)); /* start output proc */
+ void (*sc_ctlp) __P((struct ppp_softc *)); /* rcvd control pkt */
+ void (*sc_relinq) __P((struct ppp_softc *)); /* relinquish ifunit */
+ short sc_mru; /* max receive unit */
+ pid_t sc_xfer; /* used in transferring unit */
+ struct ifqueue sc_rawq; /* received packets */
+ struct ifqueue sc_inq; /* queue of input packets for daemon */
+ struct ifqueue sc_fastq; /* interactive output packet q */
+ 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 vjcompress sc_comp; /* vjc control buffer */
+#endif
+ u_int sc_bytessent; /* count of octets sent */
+ u_int sc_bytesrcvd; /* count of octets received */
+ 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 */
+ void *sc_xc_state; /* transmit compressor state */
+ struct compressor *sc_rcomp; /* receive decompressor */
+ 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 */
+
+ /* Device-dependent part for async lines. */
+ ext_accm sc_asyncmap; /* async control character map */
+ u_long sc_rasyncmap; /* receive async control char map */
+ struct mbuf *sc_outm; /* mbuf chain currently being output */
+ struct mbuf *sc_m; /* pointer to input mbuf chain */
+ struct mbuf *sc_mc; /* pointer to current input mbuf */
+ char *sc_mp; /* ptr to next char in input mbuf */
+ short sc_ilen; /* length of input packet so far */
+ u_short sc_fcs; /* FCS so far (input) */
+ u_short sc_outfcs; /* FCS so far for output packet */
+ u_char sc_rawin[16]; /* chars as received */
+ int sc_rawin_count; /* # in sc_rawin */
+};
+
+struct ppp_softc ppp_softc[NPPP];
+
+struct ppp_softc *pppalloc __P((pid_t pid));
+void pppdealloc __P((struct ppp_softc *sc));
+int pppioctl __P((struct ppp_softc *sc, int cmd, caddr_t data,
+ int flag, struct proc *p));
+void ppppktin __P((struct ppp_softc *sc, struct mbuf *m, int lost));
+struct mbuf *ppp_dequeue __P((struct ppp_softc *sc));
--- /dev/null
+/*
+ * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous
+ * tty devices.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Drew D. Perkins
+ * Carnegie Mellon University
+ * 4910 Forbes Ave.
+ * Pittsburgh, PA 15213
+ * (412) 268-8576
+ * ddp@andrew.cmu.edu
+ *
+ * Based on:
+ * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
+ *
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Serial Line interface
+ *
+ * Rick Adams
+ * Center for Seismic Studies
+ * 1300 N 17th Street, Suite 1450
+ * Arlington, Virginia 22209
+ * (703)276-7900
+ * rick@seismo.ARPA
+ * seismo!rick
+ *
+ * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
+ * Converted to 4.3BSD Beta by Chris Torek.
+ * Other changes made at Berkeley, based in part on code by Kirk Smith.
+ *
+ * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
+ * Added VJ tcp header compression; more unified ioctls
+ *
+ * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
+ * Cleaned up a lot of the mbuf-related code to fix bugs that
+ * caused system crashes and packet corruption. Changed pppstart
+ * so that it doesn't just give up with a collision if the whole
+ * packet doesn't fit in the output ring buffer.
+ *
+ * Added priority queueing for interactive IP packets, following
+ * the model of if_sl.c, plus hooks for bpf.
+ * Paul Mackerras (paulus@cs.anu.edu.au).
+ */
+
+/* $Id: ppp_tty.c,v 1.1 1994/12/15 22:28:09 paulus Exp $ */
+/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
+
+#include "ppp.h"
+#if NPPP > 0
+
+#define VJC
+#define PPP_COMPRESS
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/mbuf.h>
+#include <sys/dkstat.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/file.h>
+#include <sys/tty.h>
+#include <sys/kernel.h>
+#include <sys/conf.h>
+#include <sys/vnode.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+
+#ifdef VJC
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <net/pppcompress.h>
+#endif
+
+#include <net/ppp_defs.h>
+#include <net/if_ppp.h>
+#include <net/if_pppvar.h>
+
+void pppasyncattach __P((void));
+int pppopen __P((dev_t dev, struct tty *tp));
+int pppclose __P((struct tty *tp, int flag));
+int pppread __P((struct tty *tp, struct uio *uio, int flag));
+int pppwrite __P((struct tty *tp, struct uio *uio, int flag));
+int ppptioctl __P((struct tty *tp, int cmd, caddr_t data, int flag,
+ struct proc *));
+int pppinput __P((int c, struct tty *tp));
+int pppstart __P((struct tty *tp));
+
+static u_short pppfcs __P((u_short fcs, u_char *cp, int len));
+static void pppasyncstart __P((struct ppp_softc *));
+static void pppasyncctlp __P((struct ppp_softc *));
+static void pppasyncrelinq __P((struct ppp_softc *));
+static void ppp_timeout __P((void *));
+static void pppgetm __P((struct ppp_softc *sc));
+static void pppdumpb __P((u_char *b, int l));
+static void ppplogchar __P((struct ppp_softc *, int));
+
+/*
+ * Some useful mbuf macros not in mbuf.h.
+ */
+#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
+
+#define M_DATASTART(m) \
+ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
+ (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
+
+#define M_DATASIZE(m) \
+ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
+ (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
+
+/*
+ * Does c need to be escaped?
+ */
+#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
+
+/*
+ * Procedures for using an async tty interface for PPP.
+ */
+
+/* This is a FreeBSD-2.0 kernel. */
+#define CCOUNT(q) ((q)->c_cc)
+#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
+
+/*
+ * Define the PPP line discipline.
+ */
+
+static struct linesw pppdisc = {
+ pppopen, pppclose, pppread, pppwrite, ppptioctl,
+ pppinput, pppstart, nullmodem
+};
+
+void
+pppasyncattach()
+{
+ linesw[PPPDISC] = pppdisc;
+}
+
+TEXT_SET(pseudo_set, pppasyncattach);
+
+/*
+ * Line specific open routine for async tty devices.
+ * Attach the given tty to the first available ppp unit.
+ */
+/* ARGSUSED */
+int
+pppopen(dev, tp)
+ dev_t dev;
+ register struct tty *tp;
+{
+ struct proc *p = curproc; /* XXX */
+ register struct ppp_softc *sc;
+ int error, s, i;
+
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ return (error);
+
+ if (tp->t_line == PPPDISC) {
+ sc = (struct ppp_softc *) tp->t_sc;
+ if (sc != NULL && sc->sc_devp == (void *) tp)
+ return (0);
+ }
+
+ if ((sc = pppalloc(p->p_pid)) == NULL)
+ return ENXIO;
+
+ if (sc->sc_relinq)
+ (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */
+
+ s = splimp();
+ sc->sc_ilen = 0;
+ sc->sc_m = NULL;
+ bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
+ sc->sc_asyncmap[0] = 0xffffffff;
+ sc->sc_asyncmap[3] = 0x60000000;
+ sc->sc_rasyncmap = 0;
+ sc->sc_devp = (void *) tp;
+ sc->sc_start = pppasyncstart;
+ sc->sc_ctlp = pppasyncctlp;
+ sc->sc_relinq = pppasyncrelinq;
+ sc->sc_outm = NULL;
+ pppgetm(sc);
+ sc->sc_if.if_flags |= IFF_RUNNING;
+
+ tp->t_sc = (caddr_t) sc;
+ ttyflush(tp, FREAD | FWRITE);
+ splx(s);
+
+ return (0);
+}
+
+/*
+ * Line specific close routine.
+ * Detach the tty from the ppp unit.
+ * Mimics part of ttyclose().
+ */
+int
+pppclose(tp, flag)
+ struct tty *tp;
+ int flag;
+{
+ register struct ppp_softc *sc;
+ struct mbuf *m;
+ int s;
+
+ ttywflush(tp);
+ s = splimp(); /* paranoid; splnet probably ok */
+ tp->t_line = 0;
+ sc = (struct ppp_softc *) tp->t_sc;
+ if (sc != NULL) {
+ tp->t_sc = NULL;
+ if (tp == (struct tty *) sc->sc_devp) {
+ pppasyncrelinq(sc);
+ pppdealloc(sc);
+ }
+ }
+ splx(s);
+ return 0;
+}
+
+/*
+ * Relinquish the interface unit to another device.
+ */
+static void
+pppasyncrelinq(sc)
+ struct ppp_softc *sc;
+{
+ int s;
+
+ s = splimp();
+ if (sc->sc_outm) {
+ m_freem(sc->sc_outm);
+ sc->sc_outm = NULL;
+ }
+ if (sc->sc_m) {
+ m_freem(sc->sc_m);
+ sc->sc_m = NULL;
+ }
+ if (sc->sc_flags & SC_TIMEOUT) {
+ untimeout(ppp_timeout, (void *) sc);
+ sc->sc_flags &= ~SC_TIMEOUT;
+ }
+ splx(s);
+}
+
+/*
+ * Line specific (tty) read routine.
+ */
+int
+pppread(tp, uio, flag)
+ register struct tty *tp;
+ struct uio *uio;
+ int flag;
+{
+ register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
+ struct mbuf *m, *m0;
+ register int s;
+ int error = 0;
+
+ if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
+ return 0; /* end of file */
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return 0;
+ s = splimp();
+ while (sc->sc_inq.ifq_head == NULL && tp->t_line == PPPDISC) {
+ if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
+ splx(s);
+ return (EWOULDBLOCK);
+ }
+ error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI|PCATCH, ttyin, 0);
+ if (error) {
+ splx(s);
+ return error;
+ }
+ }
+ if (tp->t_line != PPPDISC) {
+ splx(s);
+ return (-1);
+ }
+
+ /* Pull place-holder byte out of canonical queue */
+ getc(&tp->t_canq);
+
+ /* Get the packet from the input queue */
+ IF_DEQUEUE(&sc->sc_inq, m0);
+ splx(s);
+
+ for (m = m0; m && uio->uio_resid; m = m->m_next)
+ if (error = uiomove(mtod(m, u_char *), m->m_len, uio))
+ break;
+ m_freem(m0);
+ return (error);
+}
+
+/*
+ * Line specific (tty) write routine.
+ */
+int
+pppwrite(tp, uio, flag)
+ register struct tty *tp;
+ struct uio *uio;
+ int flag;
+{
+ register struct ppp_softc *sc = (struct ppp_softc *)tp->t_sc;
+ struct mbuf *m, *m0, **mp;
+ struct sockaddr dst;
+ int len, error;
+
+ if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
+ return 0; /* wrote 0 bytes */
+ if (tp->t_line != PPPDISC)
+ return (EINVAL);
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return EIO;
+ if (uio->uio_resid > sc->sc_if.if_mtu + PPP_HDRLEN ||
+ uio->uio_resid < PPP_HDRLEN)
+ return (EMSGSIZE);
+ for (mp = &m0; uio->uio_resid; mp = &m->m_next) {
+ MGET(m, M_WAIT, MT_DATA);
+ if ((*mp = m) == NULL) {
+ m_freem(m0);
+ return (ENOBUFS);
+ }
+ m->m_len = 0;
+ if (uio->uio_resid >= MCLBYTES / 2)
+ MCLGET(m, M_DONTWAIT);
+ len = M_TRAILINGSPACE(m);
+ if (len > uio->uio_resid)
+ len = uio->uio_resid;
+ if (error = uiomove(mtod(m, u_char *), len, uio)) {
+ m_freem(m0);
+ return (error);
+ }
+ m->m_len = len;
+ }
+ dst.sa_family = AF_UNSPEC;
+ bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
+ m0->m_data += PPP_HDRLEN;
+ m0->m_len -= PPP_HDRLEN;
+ return (pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0));
+}
+
+/*
+ * Line specific (tty) ioctl routine.
+ * This discipline requires that tty device drivers call
+ * the line specific l_ioctl routine from their ioctl routines.
+ */
+/* ARGSUSED */
+int
+ppptioctl(tp, cmd, data, flag, p)
+ struct tty *tp;
+ caddr_t data;
+ int cmd, flag;
+ struct proc *p;
+{
+ struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
+ int error, s;
+
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return -1;
+
+ error = 0;
+ switch (cmd) {
+ case PPPIOCSASYNCMAP:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ break;
+ sc->sc_asyncmap[0] = *(u_int *)data;
+ break;
+
+ case PPPIOCGASYNCMAP:
+ *(u_int *)data = sc->sc_asyncmap[0];
+ break;
+
+ case PPPIOCSRASYNCMAP:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ break;
+ sc->sc_rasyncmap = *(u_int *)data;
+ break;
+
+ case PPPIOCGRASYNCMAP:
+ *(u_int *)data = sc->sc_rasyncmap;
+ break;
+
+ case PPPIOCSXASYNCMAP:
+ if (error = suser(p->p_ucred, &p->p_acflag))
+ break;
+ s = spltty();
+ bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
+ sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */
+ sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */
+ sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */
+ splx(s);
+ break;
+
+ case PPPIOCGXASYNCMAP:
+ bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
+ break;
+
+ default:
+ error = pppioctl(sc, cmd, data, flag, p);
+ if (error == 0 && cmd == PPPIOCSMRU)
+ pppgetm(sc);
+ }
+
+ return error;
+}
+
+/*
+ * FCS lookup table as calculated by genfcstab.
+ */
+static u_short fcstab[256] = {
+ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+/*
+ * Calculate a new FCS given the current FCS and the new data.
+ */
+static u_short
+pppfcs(fcs, cp, len)
+ register u_short fcs;
+ register u_char *cp;
+ register int len;
+{
+ while (len--)
+ fcs = PPP_FCS(fcs, *cp++);
+ return (fcs);
+}
+
+/*
+ * This gets called from pppoutput when a new packet is
+ * put on a queue.
+ */
+static void
+pppasyncstart(sc)
+ register struct ppp_softc *sc;
+{
+ register struct tty *tp = (struct tty *) sc->sc_devp;
+ int s;
+
+ s = splimp();
+ pppstart(tp);
+ splx(s);
+}
+
+/*
+ * This gets called when a received packet is placed on
+ * the inq.
+ */
+static void
+pppasyncctlp(sc)
+ struct ppp_softc *sc;
+{
+ struct tty *tp;
+
+ /* Put a placeholder byte in canq for ttselect()/ttnread(). */
+ tp = (struct tty *) sc->sc_devp;
+ putc(0, &tp->t_canq);
+ ttwakeup(tp);
+}
+
+/*
+ * Start output on async tty interface. Get another datagram
+ * to send from the interface queue and start sending it.
+ */
+int
+pppstart(tp)
+ register struct tty *tp;
+{
+ register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
+ register struct mbuf *m;
+ register int len;
+ register u_char *start, *stop, *cp;
+ int n, s, ndone, done, idle;
+ struct mbuf *m2;
+
+ if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0
+ || sc == NULL || tp != (struct tty *) sc->sc_devp) {
+ if (tp->t_oproc != NULL)
+ (*tp->t_oproc)(tp);
+ return 0;
+ }
+
+ idle = 0;
+ while (CCOUNT(&tp->t_outq) < PPP_HIWAT) {
+ /*
+ * See if we have an existing packet partly sent.
+ * If not, get a new packet and start sending it.
+ */
+ m = sc->sc_outm;
+ if (m == NULL) {
+ /*
+ * Get another packet to be sent.
+ */
+ m = ppp_dequeue(sc);
+ if (m == NULL) {
+ idle = 1;
+ break;
+ }
+
+ /*
+ * The extra PPP_FLAG will start up a new packet, and thus
+ * will flush any accumulated garbage. We do this whenever
+ * the line may have been idle for some time.
+ */
+ if (CCOUNT(&tp->t_outq) == 0) {
+ ++sc->sc_bytessent;
+ (void) putc(PPP_FLAG, &tp->t_outq);
+ }
+
+ /* Calculate the FCS for the first mbuf's worth. */
+ sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
+ }
+
+ for (;;) {
+ start = mtod(m, u_char *);
+ len = m->m_len;
+ stop = start + len;
+ while (len > 0) {
+ /*
+ * Find out how many bytes in the string we can
+ * handle without doing something special.
+ */
+ for (cp = start; cp < stop; cp++)
+ if (ESCAPE_P(*cp))
+ break;
+ n = cp - start;
+ if (n) {
+ /* NetBSD (0.9 or later), 4.3-Reno or similar. */
+ ndone = n - b_to_q(start, n, &tp->t_outq);
+ len -= ndone;
+ start += ndone;
+ sc->sc_bytessent += ndone;
+
+ if (ndone < n)
+ break; /* packet doesn't fit */
+ }
+ /*
+ * If there are characters left in the mbuf,
+ * the first one must be special..
+ * Put it out in a different form.
+ */
+ if (len) {
+ if (putc(PPP_ESCAPE, &tp->t_outq))
+ break;
+ if (putc(*start ^ PPP_TRANS, &tp->t_outq)) {
+ (void) unputc(&tp->t_outq);
+ break;
+ }
+ sc->sc_bytessent += 2;
+ start++;
+ len--;
+ }
+ }
+
+ /*
+ * If we didn't empty this mbuf, remember where we're up to.
+ * If we emptied the last mbuf, try to add the FCS and closing
+ * flag, and if we can't, leave sc_outm pointing to m, but with
+ * m->m_len == 0, to remind us to output the FCS and flag later.
+ */
+ done = len == 0;
+ if (done && m->m_next == NULL) {
+ u_char *p, *q;
+ int c;
+ u_char endseq[8];
+
+ /*
+ * We may have to escape the bytes in the FCS.
+ */
+ p = endseq;
+ c = ~sc->sc_outfcs & 0xFF;
+ if (ESCAPE_P(c)) {
+ *p++ = PPP_ESCAPE;
+ *p++ = c ^ PPP_TRANS;
+ } else
+ *p++ = c;
+ c = (~sc->sc_outfcs >> 8) & 0xFF;
+ if (ESCAPE_P(c)) {
+ *p++ = PPP_ESCAPE;
+ *p++ = c ^ PPP_TRANS;
+ } else
+ *p++ = c;
+ *p++ = PPP_FLAG;
+
+ /*
+ * Try to output the FCS and flag. If the bytes
+ * don't all fit, back out.
+ */
+ for (q = endseq; q < p; ++q)
+ if (putc(*q, &tp->t_outq)) {
+ done = 0;
+ for (; q > endseq; --q)
+ unputc(&tp->t_outq);
+ break;
+ }
+ sc->sc_bytessent += q - endseq;
+ }
+
+ if (!done) {
+ /* remember where we got to */
+ m->m_data = start;
+ m->m_len = len;
+ break;
+ }
+
+ /* Finished with this mbuf; free it and move on. */
+ MFREE(m, m2);
+ 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);
+ }
+
+ /*
+ * Here we have either finished a packet (m == NULL)
+ * or filled up the output queue (m != NULL).
+ */
+ sc->sc_outm = m;
+ if (m)
+ break;
+ }
+
+ /*
+ * If there is stuff in the output queue, send it now.
+ * We are being called in lieu of ttstart and must do what it would.
+ */
+ if (tp->t_oproc != NULL)
+ (*tp->t_oproc)(tp);
+
+ /*
+ * This timeout is needed for operation on a pseudo-tty,
+ * because the pty code doesn't call pppstart after it has
+ * drained the t_outq.
+ */
+ if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
+ timeout(ppp_timeout, (void *) sc, 1);
+ sc->sc_flags |= SC_TIMEOUT;
+ }
+
+ return 0;
+}
+
+/*
+ * Timeout routine - try to start some more output.
+ */
+static void
+ppp_timeout(x)
+ void *x;
+{
+ struct ppp_softc *sc = (struct ppp_softc *) x;
+ struct tty *tp = (struct tty *) sc->sc_devp;
+ int s;
+
+ s = splimp();
+ sc->sc_flags &= ~SC_TIMEOUT;
+ pppstart(tp);
+ splx(s);
+}
+
+/*
+ * Allocate enough mbuf to handle current MRU.
+ */
+static void
+pppgetm(sc)
+ register struct ppp_softc *sc;
+{
+ struct mbuf *m, **mp;
+ int len;
+ int s;
+
+ s = splimp();
+ mp = &sc->sc_m;
+ for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
+ if ((m = *mp) == NULL) {
+ MGETHDR(m, M_DONTWAIT, MT_DATA);
+ if (m == NULL)
+ break;
+ *mp = m;
+ MCLGET(m, M_DONTWAIT);
+ }
+ len -= M_DATASIZE(m);
+ mp = &m->m_next;
+ }
+ splx(s);
+}
+
+/*
+ * tty interface receiver interrupt.
+ */
+static unsigned paritytab[8] = {
+ 0x96696996, 0x69969669, 0x69969669, 0x96696996,
+ 0x69969669, 0x96696996, 0x96696996, 0x69969669
+};
+
+int
+pppinput(c, tp)
+ int c;
+ register struct tty *tp;
+{
+ register struct ppp_softc *sc;
+ struct mbuf *m;
+ int ilen, s;
+
+ sc = (struct ppp_softc *) tp->t_sc;
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return 0;
+
+ s = spltty();
+ ++tk_nin;
+ ++sc->sc_bytesrcvd;
+
+ if (c & TTY_FE) {
+ /* framing error or overrun on this char - abort packet */
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: bad char %x\n", sc->sc_if.if_unit, c);
+ goto flush;
+ }
+
+ c &= 0xff;
+
+ if (c & 0x80)
+ sc->sc_flags |= SC_RCV_B7_1;
+ else
+ sc->sc_flags |= SC_RCV_B7_0;
+ if (paritytab[c >> 5] & (1 << (c & 0x1F)))
+ sc->sc_flags |= SC_RCV_ODDP;
+ else
+ sc->sc_flags |= SC_RCV_EVNP;
+
+ if (sc->sc_flags & SC_LOG_RAWIN)
+ ppplogchar(sc, c);
+
+ 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);
+
+ /*
+ * If SC_ESCAPED is set, then we've seen the packet
+ * abort sequence "}~".
+ */
+ if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
+ || ilen > 0 && sc->sc_fcs != PPP_GOODFCS) {
+ sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
+ if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: bad fcs %x\n", sc->sc_if.if_unit,
+ sc->sc_fcs);
+ sc->sc_if.if_ierrors++;
+ } else
+ sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
+ splx(s);
+ return 0;
+ }
+
+ if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
+ if (ilen) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
+ sc->sc_if.if_ierrors++;
+ sc->sc_flags |= SC_PKTLOST;
+ }
+ splx(s);
+ return 0;
+ }
+
+ /*
+ * Remove FCS trailer. Somewhat painful...
+ */
+ ilen -= 2;
+ if (--sc->sc_mc->m_len == 0) {
+ for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
+ ;
+ sc->sc_mc = m;
+ }
+ sc->sc_mc->m_len--;
+
+ /* excise this mbuf chain */
+ m = sc->sc_m;
+ sc->sc_m = sc->sc_mc->m_next;
+ sc->sc_mc->m_next = NULL;
+
+ ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
+ sc->sc_flags &= ~SC_PKTLOST;
+
+ pppgetm(sc);
+ splx(s);
+ return 0;
+ }
+
+ if (sc->sc_flags & SC_FLUSH) {
+ if (sc->sc_flags & SC_LOG_FLUSH)
+ ppplogchar(sc, c);
+ splx(s);
+ return 0;
+ }
+
+ if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) {
+ splx(s);
+ return 0;
+ }
+
+ if (sc->sc_flags & SC_ESCAPED) {
+ sc->sc_flags &= ~SC_ESCAPED;
+ c ^= PPP_TRANS;
+ } else if (c == PPP_ESCAPE) {
+ sc->sc_flags |= SC_ESCAPED;
+ splx(s);
+ return 0;
+ }
+
+ /*
+ * Initialize buffer on first octet received.
+ * First octet could be address or protocol (when compressing
+ * address/control).
+ * Second octet is control.
+ * Third octet is first or second (when compressing protocol)
+ * octet of protocol.
+ * Fourth octet is second octet of protocol.
+ */
+ if (sc->sc_ilen == 0) {
+ /* reset the first input mbuf */
+ if (sc->sc_m == NULL) {
+ pppgetm(sc);
+ if (sc->sc_m == NULL) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
+ goto flush;
+ }
+ }
+ m = sc->sc_m;
+ m->m_len = 0;
+ m->m_data = M_DATASTART(sc->sc_m);
+ sc->sc_mc = m;
+ sc->sc_mp = mtod(m, char *);
+ sc->sc_fcs = PPP_INITFCS;
+ if (c != PPP_ALLSTATIONS) {
+ if (sc->sc_flags & SC_REJ_COMP_AC) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
+ sc->sc_if.if_unit, c);
+ goto flush;
+ }
+ *sc->sc_mp++ = PPP_ALLSTATIONS;
+ *sc->sc_mp++ = PPP_UI;
+ sc->sc_ilen += 2;
+ m->m_len += 2;
+ }
+ }
+ if (sc->sc_ilen == 1 && c != PPP_UI) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: missing UI (0x3), got 0x%x\n",
+ sc->sc_if.if_unit, c);
+ goto flush;
+ }
+ if (sc->sc_ilen == 2 && (c & 1) == 1) {
+ /* a compressed protocol */
+ *sc->sc_mp++ = 0;
+ sc->sc_ilen++;
+ sc->sc_mc->m_len++;
+ }
+ if (sc->sc_ilen == 3 && (c & 1) == 0) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
+ (sc->sc_mp[-1] << 8) + c);
+ goto flush;
+ }
+
+ /* packet beyond configured mru? */
+ if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
+ goto flush;
+ }
+
+ /* is this mbuf full? */
+ m = sc->sc_mc;
+ if (M_TRAILINGSPACE(m) <= 0) {
+ if (m->m_next == NULL) {
+ pppgetm(sc);
+ if (m->m_next == NULL) {
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
+ goto flush;
+ }
+ }
+ sc->sc_mc = m = m->m_next;
+ m->m_len = 0;
+ m->m_data = M_DATASTART(m);
+ sc->sc_mp = mtod(m, char *);
+ }
+
+ ++m->m_len;
+ *sc->sc_mp++ = c;
+ sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
+ splx(s);
+ return 0;
+
+ flush:
+ if (!(sc->sc_flags & SC_FLUSH)) {
+ sc->sc_if.if_ierrors++;
+ sc->sc_flags |= SC_FLUSH;
+ if (sc->sc_flags & SC_LOG_FLUSH)
+ ppplogchar(sc, c);
+ }
+ splx(s);
+ return 0;
+}
+
+#define MAX_DUMP_BYTES 128
+
+static void
+ppplogchar(sc, c)
+ struct ppp_softc *sc;
+ int c;
+{
+ if (c >= 0)
+ sc->sc_rawin[sc->sc_rawin_count++] = c;
+ if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
+ || c < 0 && sc->sc_rawin_count > 0) {
+ printf("ppp%d input: ", sc->sc_if.if_unit);
+ pppdumpb(sc->sc_rawin, sc->sc_rawin_count);
+ sc->sc_rawin_count = 0;
+ }
+}
+
+static void
+pppdumpb(b, l)
+ u_char *b;
+ int l;
+{
+ char buf[3*MAX_DUMP_BYTES+4];
+ char *bp = buf;
+ static char digits[] = "0123456789abcdef";
+
+ while (l--) {
+ if (bp >= buf + sizeof(buf) - 3) {
+ *bp++ = '>';
+ break;
+ }
+ *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */
+ *bp++ = digits[*b++ & 0xf];
+ *bp++ = ' ';
+ }
+
+ *bp = 0;
+ printf("%s\n", buf);
+}
+
+#endif /* NPPP > 0 */
--- /dev/null
+/*-
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)slcompress.c 7.7 (Berkeley) 5/7/91
+ */
+
+/*
+ * Routines to compress and uncompess tcp packets (for transmission
+ * over low speed serial lines.
+ *
+ * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
+ * - Initial distribution.
+ *
+ * $Id: pppcompress.c,v 1.1 1994/12/15 22:27:17 paulus Exp $
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+
+#include <net/pppcompress.h>
+
+#ifndef SL_NO_STATS
+#define INCR(counter) ++comp->counter;
+#else
+#define INCR(counter)
+#endif
+
+#define BCMP(p1, p2, n) bcmp((char *)(p1), (char *)(p2), (int)(n))
+#define BCOPY(p1, p2, n) bcopy((char *)(p1), (char *)(p2), (int)(n))
+#ifndef KERNEL
+#define ovbcopy bcopy
+#endif
+
+void
+vj_compress_init(comp, max_state)
+ struct vjcompress *comp;
+ int max_state;
+{
+ register u_int i;
+ register struct cstate *tstate = comp->tstate;
+
+ if ((unsigned) max_state > MAX_STATES - 1)
+ max_state = MAX_STATES - 1;
+ bzero((char *)comp, sizeof(*comp));
+ for (i = max_state; i > 0; --i) {
+ tstate[i].cs_id = i;
+ tstate[i].cs_next = &tstate[i - 1];
+ }
+ tstate[0].cs_next = &tstate[max_state];
+ tstate[0].cs_id = 0;
+ comp->last_cs = &tstate[0];
+ comp->last_recv = 255;
+ comp->last_xmit = 255;
+ comp->flags = SLF_TOSS;
+}
+
+
+/* ENCODE encodes a number that is known to be non-zero. ENCODEZ
+ * checks for zero (since zero has to be encoded in the long, 3 byte
+ * form).
+ */
+#define ENCODE(n) { \
+ if ((u_short)(n) >= 256) { \
+ *cp++ = 0; \
+ cp[1] = (n); \
+ cp[0] = (n) >> 8; \
+ cp += 2; \
+ } else { \
+ *cp++ = (n); \
+ } \
+}
+#define ENCODEZ(n) { \
+ if ((u_short)(n) >= 256 || (u_short)(n) == 0) { \
+ *cp++ = 0; \
+ cp[1] = (n); \
+ cp[0] = (n) >> 8; \
+ cp += 2; \
+ } else { \
+ *cp++ = (n); \
+ } \
+}
+
+#define DECODEL(f) { \
+ if (*cp == 0) {\
+ (f) = htonl(ntohl(f) + ((cp[1] << 8) | cp[2])); \
+ cp += 3; \
+ } else { \
+ (f) = htonl(ntohl(f) + (u_long)*cp++); \
+ } \
+}
+
+#define DECODES(f) { \
+ if (*cp == 0) {\
+ (f) = htons(ntohs(f) + ((cp[1] << 8) | cp[2])); \
+ cp += 3; \
+ } else { \
+ (f) = htons(ntohs(f) + (u_long)*cp++); \
+ } \
+}
+
+#define DECODEU(f) { \
+ if (*cp == 0) {\
+ (f) = htons((cp[1] << 8) | cp[2]); \
+ cp += 3; \
+ } else { \
+ (f) = htons((u_long)*cp++); \
+ } \
+}
+
+u_int
+vj_compress_tcp(m, ip, comp, compress_cid)
+ struct mbuf *m;
+ register struct ip *ip;
+ struct vjcompress *comp;
+ int compress_cid;
+{
+ register struct cstate *cs = comp->last_cs->cs_next;
+ register u_int hlen = ip->ip_hl;
+ register struct tcphdr *oth;
+ register struct tcphdr *th;
+ register u_int deltaS, deltaA;
+ register u_int changes = 0;
+ u_char new_seq[16];
+ register u_char *cp = new_seq;
+
+ /*
+ * Bail if this is an IP fragment or if the TCP packet isn't
+ * `compressible' (i.e., ACK isn't set or some other control bit is
+ * set). (We assume that the caller has already made sure the
+ * packet is IP proto TCP).
+ */
+ if ((ip->ip_off & htons(0x3fff)) || m->m_len < 40)
+ return (TYPE_IP);
+
+ th = (struct tcphdr *)&((int *)ip)[hlen];
+ if ((th->th_flags & (TH_SYN|TH_FIN|TH_RST|TH_ACK)) != TH_ACK)
+ return (TYPE_IP);
+ /*
+ * Packet is compressible -- we're going to send either a
+ * COMPRESSED_TCP or UNCOMPRESSED_TCP packet. Either way we need
+ * to locate (or create) the connection state. Special case the
+ * most recently used connection since it's most likely to be used
+ * again & we don't have to do any reordering if it's used.
+ */
+ INCR(sls_packets)
+ if (ip->ip_src.s_addr != cs->cs_ip.ip_src.s_addr ||
+ ip->ip_dst.s_addr != cs->cs_ip.ip_dst.s_addr ||
+ *(int *)th != ((int *)&cs->cs_ip)[cs->cs_ip.ip_hl]) {
+ /*
+ * Wasn't the first -- search for it.
+ *
+ * States are kept in a circularly linked list with
+ * last_cs pointing to the end of the list. The
+ * list is kept in lru order by moving a state to the
+ * head of the list whenever it is referenced. Since
+ * the list is short and, empirically, the connection
+ * we want is almost always near the front, we locate
+ * states via linear search. If we don't find a state
+ * for the datagram, the oldest state is (re-)used.
+ */
+ register struct cstate *lcs;
+ register struct cstate *lastcs = comp->last_cs;
+
+ do {
+ lcs = cs; cs = cs->cs_next;
+ INCR(sls_searches)
+ if (ip->ip_src.s_addr == cs->cs_ip.ip_src.s_addr
+ && ip->ip_dst.s_addr == cs->cs_ip.ip_dst.s_addr
+ && *(int *)th == ((int *)&cs->cs_ip)[cs->cs_ip.ip_hl])
+ goto found;
+ } while (cs != lastcs);
+
+ /*
+ * Didn't find it -- re-use oldest cstate. Send an
+ * uncompressed packet that tells the other side what
+ * connection number we're using for this conversation.
+ * Note that since the state list is circular, the oldest
+ * state points to the newest and we only need to set
+ * last_cs to update the lru linkage.
+ */
+ INCR(sls_misses)
+ comp->last_cs = lcs;
+ hlen += th->th_off;
+ hlen <<= 2;
+ goto uncompressed;
+
+ found:
+ /*
+ * Found it -- move to the front on the connection list.
+ */
+ if (cs == lastcs)
+ comp->last_cs = lcs;
+ else {
+ lcs->cs_next = cs->cs_next;
+ cs->cs_next = lastcs->cs_next;
+ lastcs->cs_next = cs;
+ }
+ }
+
+ /*
+ * Make sure that only what we expect to change changed. The first
+ * line of the `if' checks the IP protocol version, header length &
+ * type of service. The 2nd line checks the "Don't fragment" bit.
+ * The 3rd line checks the time-to-live and protocol (the protocol
+ * check is unnecessary but costless). The 4th line checks the TCP
+ * header length. The 5th line checks IP options, if any. The 6th
+ * line checks TCP options, if any. If any of these things are
+ * different between the previous & current datagram, we send the
+ * current datagram `uncompressed'.
+ */
+ oth = (struct tcphdr *)&((int *)&cs->cs_ip)[hlen];
+ deltaS = hlen;
+ hlen += th->th_off;
+ hlen <<= 2;
+
+ if (((u_short *)ip)[0] != ((u_short *)&cs->cs_ip)[0] ||
+ ((u_short *)ip)[3] != ((u_short *)&cs->cs_ip)[3] ||
+ ((u_short *)ip)[4] != ((u_short *)&cs->cs_ip)[4] ||
+ th->th_off != oth->th_off ||
+ (deltaS > 5 &&
+ BCMP(ip + 1, &cs->cs_ip + 1, (deltaS - 5) << 2)) ||
+ (th->th_off > 5 &&
+ BCMP(th + 1, oth + 1, (th->th_off - 5) << 2)))
+ goto uncompressed;
+
+ /*
+ * Figure out which of the changing fields changed. The
+ * receiver expects changes in the order: urgent, window,
+ * ack, seq (the order minimizes the number of temporaries
+ * needed in this section of code).
+ */
+ if (th->th_flags & TH_URG) {
+ deltaS = ntohs(th->th_urp);
+ ENCODEZ(deltaS);
+ changes |= NEW_U;
+ } else if (th->th_urp != oth->th_urp)
+ /* argh! URG not set but urp changed -- a sensible
+ * implementation should never do this but RFC793
+ * doesn't prohibit the change so we have to deal
+ * with it. */
+ goto uncompressed;
+
+ if (deltaS = (u_short)(ntohs(th->th_win) - ntohs(oth->th_win))) {
+ ENCODE(deltaS);
+ changes |= NEW_W;
+ }
+
+ if (deltaA = ntohl(th->th_ack) - ntohl(oth->th_ack)) {
+ if (deltaA > 0xffff)
+ goto uncompressed;
+ ENCODE(deltaA);
+ changes |= NEW_A;
+ }
+
+ if (deltaS = ntohl(th->th_seq) - ntohl(oth->th_seq)) {
+ if (deltaS > 0xffff)
+ goto uncompressed;
+ ENCODE(deltaS);
+ changes |= NEW_S;
+ }
+
+ switch(changes) {
+
+ case 0:
+ /*
+ * Nothing changed. If this packet contains data and the
+ * last one didn't, this is probably a data packet following
+ * an ack (normal on an interactive connection) and we send
+ * it compressed. Otherwise it's probably a retransmit,
+ * retransmitted ack or window probe. Send it uncompressed
+ * in case the other side missed the compressed version.
+ */
+ if (ip->ip_len != cs->cs_ip.ip_len &&
+ ntohs(cs->cs_ip.ip_len) == hlen)
+ break;
+
+ /* (fall through) */
+
+ case SPECIAL_I:
+ case SPECIAL_D:
+ /*
+ * actual changes match one of our special case encodings --
+ * send packet uncompressed.
+ */
+ goto uncompressed;
+
+ case NEW_S|NEW_A:
+ if (deltaS == deltaA &&
+ deltaS == ntohs(cs->cs_ip.ip_len) - hlen) {
+ /* special case for echoed terminal traffic */
+ changes = SPECIAL_I;
+ cp = new_seq;
+ }
+ break;
+
+ case NEW_S:
+ if (deltaS == ntohs(cs->cs_ip.ip_len) - hlen) {
+ /* special case for data xfer */
+ changes = SPECIAL_D;
+ cp = new_seq;
+ }
+ break;
+ }
+
+ deltaS = ntohs(ip->ip_id) - ntohs(cs->cs_ip.ip_id);
+ if (deltaS != 1) {
+ ENCODEZ(deltaS);
+ changes |= NEW_I;
+ }
+ if (th->th_flags & TH_PUSH)
+ changes |= TCP_PUSH_BIT;
+ /*
+ * Grab the cksum before we overwrite it below. Then update our
+ * state with this packet's header.
+ */
+ deltaA = ntohs(th->th_sum);
+ BCOPY(ip, &cs->cs_ip, hlen);
+
+ /*
+ * We want to use the original packet as our compressed packet.
+ * (cp - new_seq) is the number of bytes we need for compressed
+ * sequence numbers. In addition we need one byte for the change
+ * mask, one for the connection id and two for the tcp checksum.
+ * So, (cp - new_seq) + 4 bytes of header are needed. hlen is how
+ * many bytes of the original packet to toss so subtract the two to
+ * get the new packet size.
+ */
+ deltaS = cp - new_seq;
+ cp = (u_char *)ip;
+ if (compress_cid == 0 || comp->last_xmit != cs->cs_id) {
+ comp->last_xmit = cs->cs_id;
+ hlen -= deltaS + 4;
+ cp += hlen;
+ *cp++ = changes | NEW_C;
+ *cp++ = cs->cs_id;
+ } else {
+ hlen -= deltaS + 3;
+ cp += hlen;
+ *cp++ = changes;
+ }
+ m->m_len -= hlen;
+ m->m_data += hlen;
+ *cp++ = deltaA >> 8;
+ *cp++ = deltaA;
+ BCOPY(new_seq, cp, deltaS);
+ INCR(sls_compressed)
+ return (TYPE_COMPRESSED_TCP);
+
+ /*
+ * Update connection state cs & send uncompressed packet ('uncompressed'
+ * means a regular ip/tcp packet but with the 'conversation id' we hope
+ * to use on future compressed packets in the protocol field).
+ */
+uncompressed:
+ BCOPY(ip, &cs->cs_ip, hlen);
+ ip->ip_p = cs->cs_id;
+ comp->last_xmit = cs->cs_id;
+ return (TYPE_UNCOMPRESSED_TCP);
+}
+
+
+int
+vj_uncompress_tcp(bufp, len, type, comp)
+ u_char **bufp;
+ int len;
+ u_int type;
+ struct vjcompress *comp;
+{
+ u_char *hdr, *cp;
+ int hlen, vjlen;
+
+ cp = bufp? *bufp: NULL;
+ vjlen = vj_uncompress_tcp_core(cp, len, len, type, comp, &hdr, &hlen);
+ if (vjlen < 0)
+ return (0); /* error */
+ if (vjlen == 0)
+ return (len); /* was uncompressed already */
+
+ cp += vjlen;
+ len -= vjlen;
+
+ /*
+ * At this point, cp points to the first byte of data in the
+ * packet. If we're not aligned on a 4-byte boundary, copy the
+ * data down so the ip & tcp headers will be aligned. Then back up
+ * cp by the tcp/ip header length to make room for the reconstructed
+ * header (we assume the packet we were handed has enough space to
+ * prepend 128 bytes of header).
+ */
+ if ((int)cp & 3) {
+ if (len > 0)
+ (void) ovbcopy(cp, (caddr_t)((int)cp &~ 3), len);
+ cp = (u_char *)((int)cp &~ 3);
+ }
+ cp -= hlen;
+ len += hlen;
+ BCOPY(hdr, cp, hlen);
+
+ *bufp = cp;
+ return (len);
+}
+
+/*
+ * Uncompress a packet of total length total_len. The first buflen
+ * bytes are at buf; this must include the entire (compressed or
+ * uncompressed) TCP/IP header. This procedure returns the length
+ * of the VJ header, with a pointer to the uncompressed IP header
+ * in *hdrp and its length in *hlenp.
+ */
+int
+vj_uncompress_tcp_core(buf, buflen, total_len, type, comp, hdrp, hlenp)
+ u_char *buf;
+ int buflen, total_len;
+ u_int type;
+ struct vjcompress *comp;
+ u_char **hdrp;
+ u_int *hlenp;
+{
+ register u_char *cp;
+ register u_int hlen, changes;
+ register struct tcphdr *th;
+ register struct cstate *cs;
+ register struct ip *ip;
+ register u_short *bp;
+ register u_int vjlen;
+
+ switch (type) {
+
+ case TYPE_UNCOMPRESSED_TCP:
+ ip = (struct ip *) buf;
+ if (ip->ip_p >= MAX_STATES)
+ goto bad;
+ cs = &comp->rstate[comp->last_recv = ip->ip_p];
+ comp->flags &=~ SLF_TOSS;
+ ip->ip_p = IPPROTO_TCP;
+ hlen = ip->ip_hl;
+ hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
+ hlen <<= 2;
+ BCOPY(ip, &cs->cs_ip, hlen);
+ cs->cs_hlen = hlen;
+ INCR(sls_uncompressedin)
+ *hdrp = (u_char *) &cs->cs_ip;
+ *hlenp = hlen;
+ return (0);
+
+ default:
+ goto bad;
+
+ case TYPE_COMPRESSED_TCP:
+ break;
+ }
+ /* We've got a compressed packet. */
+ INCR(sls_compressedin)
+ cp = buf;
+ changes = *cp++;
+ if (changes & NEW_C) {
+ /* Make sure the state index is in range, then grab the state.
+ * If we have a good state index, clear the 'discard' flag. */
+ if (*cp >= MAX_STATES)
+ goto bad;
+
+ comp->flags &=~ SLF_TOSS;
+ comp->last_recv = *cp++;
+ } else {
+ /* this packet has an implicit state index. If we've
+ * had a line error since the last time we got an
+ * explicit state index, we have to toss the packet. */
+ if (comp->flags & SLF_TOSS) {
+ INCR(sls_tossed)
+ return (-1);
+ }
+ }
+ cs = &comp->rstate[comp->last_recv];
+ hlen = cs->cs_ip.ip_hl << 2;
+ th = (struct tcphdr *)&((u_char *)&cs->cs_ip)[hlen];
+ th->th_sum = htons((*cp << 8) | cp[1]);
+ cp += 2;
+ if (changes & TCP_PUSH_BIT)
+ th->th_flags |= TH_PUSH;
+ else
+ th->th_flags &=~ TH_PUSH;
+
+ switch (changes & SPECIALS_MASK) {
+ case SPECIAL_I:
+ {
+ register u_int i = ntohs(cs->cs_ip.ip_len) - cs->cs_hlen;
+ th->th_ack = htonl(ntohl(th->th_ack) + i);
+ th->th_seq = htonl(ntohl(th->th_seq) + i);
+ }
+ break;
+
+ case SPECIAL_D:
+ th->th_seq = htonl(ntohl(th->th_seq) + ntohs(cs->cs_ip.ip_len)
+ - cs->cs_hlen);
+ break;
+
+ default:
+ if (changes & NEW_U) {
+ th->th_flags |= TH_URG;
+ DECODEU(th->th_urp)
+ } else
+ th->th_flags &=~ TH_URG;
+ if (changes & NEW_W)
+ DECODES(th->th_win)
+ if (changes & NEW_A)
+ DECODEL(th->th_ack)
+ if (changes & NEW_S)
+ DECODEL(th->th_seq)
+ break;
+ }
+ if (changes & NEW_I) {
+ DECODES(cs->cs_ip.ip_id)
+ } else
+ cs->cs_ip.ip_id = htons(ntohs(cs->cs_ip.ip_id) + 1);
+
+ /*
+ * At this point, cp points to the first byte of data in the
+ * packet. Fill in the IP total length and update the IP
+ * header checksum.
+ */
+ vjlen = cp - buf;
+ buflen -= vjlen;
+ if (buflen < 0)
+ /* we must have dropped some characters (crc should detect
+ * this but the old slip framing won't) */
+ goto bad;
+
+ total_len += cs->cs_hlen - vjlen;
+ cs->cs_ip.ip_len = htons(total_len);
+
+ /* recompute the ip header checksum */
+ bp = (u_short *) &cs->cs_ip;
+ cs->cs_ip.ip_sum = 0;
+ for (changes = 0; hlen > 0; hlen -= 2)
+ changes += *bp++;
+ changes = (changes & 0xffff) + (changes >> 16);
+ changes = (changes & 0xffff) + (changes >> 16);
+ cs->cs_ip.ip_sum = ~ changes;
+
+ *hdrp = (u_char *) &cs->cs_ip;
+ *hlenp = cs->cs_hlen;
+ return vjlen;
+
+bad:
+ comp->flags |= SLF_TOSS;
+ INCR(sls_errorin)
+ return (-1);
+}
--- /dev/null
+/*
+ * Definitions for tcp compression routines.
+ *
+ * Copyright (c) 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
+ * - Initial distribution.
+ *
+ * From: slcompress.h 7.4 90/06/28
+ * $Id: pppcompress.h,v 1.1 1994/12/15 22:27:17 paulus Exp $
+ */
+
+#ifndef _NET_PPPCOMPRESS_H_
+#define _NET_PPPCOMPRESS_H_
+
+#define MAX_STATES 16 /* must be > 2 and < 256 */
+#define MAX_HDR MLEN /* XXX 4bsd-ism: should really be 128 */
+
+/*
+ * Compressed packet format:
+ *
+ * The first octet contains the packet type (top 3 bits), TCP
+ * 'push' bit, and flags that indicate which of the 4 TCP sequence
+ * numbers have changed (bottom 5 bits). The next octet is a
+ * conversation number that associates a saved IP/TCP header with
+ * the compressed packet. The next two octets are the TCP checksum
+ * from the original datagram. The next 0 to 15 octets are
+ * sequence number changes, one change per bit set in the header
+ * (there may be no changes and there are two special cases where
+ * the receiver implicitly knows what changed -- see below).
+ *
+ * There are 5 numbers which can change (they are always inserted
+ * in the following order): TCP urgent pointer, window,
+ * acknowlegement, sequence number and IP ID. (The urgent pointer
+ * is different from the others in that its value is sent, not the
+ * change in value.) Since typical use of SLIP links is biased
+ * toward small packets (see comments on MTU/MSS below), changes
+ * use a variable length coding with one octet for numbers in the
+ * range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the
+ * range 256 - 65535 or 0. (If the change in sequence number or
+ * ack is more than 65535, an uncompressed packet is sent.)
+ */
+
+/*
+ * Packet types (must not conflict with IP protocol version)
+ *
+ * The top nibble of the first octet is the packet type. There are
+ * three possible types: IP (not proto TCP or tcp with one of the
+ * control flags set); uncompressed TCP (a normal IP/TCP packet but
+ * with the 8-bit protocol field replaced by an 8-bit connection id --
+ * this type of packet syncs the sender & receiver); and compressed
+ * TCP (described above).
+ *
+ * LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and
+ * is logically part of the 4-bit "changes" field that follows. Top
+ * three bits are actual packet type. For backward compatibility
+ * and in the interest of conserving bits, numbers are chosen so the
+ * IP protocol version number (4) which normally appears in this nibble
+ * means "IP packet".
+ */
+
+/* packet types */
+#define TYPE_IP 0x40
+#define TYPE_UNCOMPRESSED_TCP 0x70
+#define TYPE_COMPRESSED_TCP 0x80
+#define TYPE_ERROR 0x00
+
+/* Bits in first octet of compressed packet */
+#define NEW_C 0x40 /* flag bits for what changed in a packet */
+#define NEW_I 0x20
+#define NEW_S 0x08
+#define NEW_A 0x04
+#define NEW_W 0x02
+#define NEW_U 0x01
+
+/* reserved, special-case values of above */
+#define SPECIAL_I (NEW_S|NEW_W|NEW_U) /* echoed interactive traffic */
+#define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U) /* unidirectional data */
+#define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
+
+#define TCP_PUSH_BIT 0x10
+
+
+/*
+ * "state" data for each active tcp conversation on the wire. This is
+ * basically a copy of the entire IP/TCP header from the last packet
+ * we saw from the conversation together with a small identifier
+ * the transmit & receive ends of the line use to locate saved header.
+ */
+struct cstate {
+ struct cstate *cs_next; /* next most recently used cstate (xmit only) */
+ u_short cs_hlen; /* size of hdr (receive only) */
+ u_char cs_id; /* connection # associated with this state */
+ u_char cs_filler;
+ union {
+ char csu_hdr[MAX_HDR];
+ struct ip csu_ip; /* ip/tcp hdr from most recent packet */
+ } slcs_u;
+};
+#define cs_ip slcs_u.csu_ip
+#define cs_hdr slcs_u.csu_hdr
+
+/*
+ * all the state data for one serial line (we need one of these
+ * per line).
+ */
+struct vjcompress {
+ struct cstate *last_cs; /* most recently used tstate */
+ u_char last_recv; /* last rcvd conn. id */
+ u_char last_xmit; /* last sent conn. id */
+ u_short flags;
+#ifndef SL_NO_STATS
+ int sls_packets; /* outbound packets */
+ int sls_compressed; /* outbound compressed packets */
+ int sls_searches; /* searches for connection state */
+ int sls_misses; /* times couldn't find conn. state */
+ int sls_uncompressedin; /* inbound uncompressed packets */
+ int sls_compressedin; /* inbound compressed packets */
+ int sls_errorin; /* inbound unknown type packets */
+ int sls_tossed; /* inbound packets tossed because of error */
+#endif
+ struct cstate tstate[MAX_STATES]; /* xmit connection states */
+ struct cstate rstate[MAX_STATES]; /* receive connection states */
+};
+/* flag values */
+#define SLF_TOSS 1 /* tossing rcvd frames because of input err */
+
+void vj_compress_init __P((struct vjcompress *, int));
+u_int vj_compress_tcp __P((struct mbuf *,
+ struct ip *, struct vjcompress *, int));
+int vj_uncompress_tcp __P((u_char **, int, u_int, struct vjcompress *));
+int vj_uncompress_tcp_core __P((u_char *, int, int, u_int,
+ struct vjcompress *, u_char **, u_int *));
+
+#endif /* _NET_PPPCOMPRESS_H_ */
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