+/*
+ * 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).
+ *
+ * Ultrix port by Per Sundstrom <sundstrom@stkhlm.enet.dec.com>,
+ * Robert Olsson <robert@robur.slu.se> and Paul Mackerras.
+ */
+
+/* $Id: if_ppp.c,v 1.1 1994/11/21 04:50:03 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 "../h/param.h"
+#include "../h/user.h"
+#include "../h/proc.h"
+#include "../h/mbuf.h"
+#include "../h/buf.h"
+#include "../h/socket.h"
+#include "../h/ioctl.h"
+#include "../h/file.h"
+#include "../h/tty.h"
+#include "../h/kernel.h"
+#include "../h/conf.h"
+#include "../h/uio.h"
+#include "../h/systm.h"
+
+#include "../net/net/if.h"
+#include "../net/net/netisr.h"
+#include "../net/net/route.h"
+#if INET
+#include "../net/netinet/in.h"
+#include "../net/netinet/in_systm.h"
+#include "../net/netinet/in_var.h"
+#include "../net/netinet/ip.h"
+#endif
+
+#ifdef VJC
+#include "slcompress.h"
+#endif
+
+#include "ppp_defs.h"
+#include "if_ppp.h"
+#include "if_pppvar.h"
+
+#ifdef PPP_COMPRESS
+#define PACKET struct mbuf
+#include "ppp-comp.h"
+#endif
+
+/*
+ * This is an Ultrix kernel, we've got clists.
+ */
+#define CCOUNT(q) ((q)->c_cc)
+
+#define t_sc T_LINEP
+#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
+
+void pppattach __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 pppoutput __P((struct ifnet *ifp, struct mbuf *m0,
+ struct sockaddr *dst));
+int pppinput __P((int c, struct tty *tp));
+int pppioctl __P((struct ifnet *ifp, int cmd, caddr_t data));
+int pppstart __P((struct tty *tp));
+
+static void ppp_ccp_closed __P((struct ppp_softc *));
+static int ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
+static int pppasyncstart __P((struct ppp_softc *));
+static u_short pppfcs __P((u_short fcs, u_char *cp, int len));
+static int pppgetm __P((struct ppp_softc *sc));
+static void pppdumpm __P((struct mbuf *m0, int pktlen));
+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_off > MMAXOFF)
+
+#define M_TRAILINGSPACE(m) \
+ ((M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr + M_CLUSTERSZ : MSIZE) \
+ - ((m)->m_off + (m)->m_len))
+
+#define M_OFFSTART(m) \
+ (M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr : MMINOFF)
+
+#define M_DATASIZE(m) \
+ (M_IS_CLUSTER(m) ? M_CLUSTERSZ : MLEN)
+
+/*
+ * The following disgusting hack gets around the problem that IP TOS
+ * can't be set yet. We want to put "interactive" traffic on a high
+ * priority queue. To decide if traffic is interactive, we check that
+ * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
+ */
+static u_short interactive_ports[8] = {
+ 0, 513, 0, 0,
+ 0, 21, 0, 23,
+};
+#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
+
+/*
+ * Does c need to be escaped?
+ */
+#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
+
+#ifdef PPP_COMPRESS
+/*
+ * List of compressors we know about.
+ */
+
+extern struct compressor ppp_bsd_compress;
+
+struct compressor *ppp_compressors[] = {
+ &ppp_bsd_compress,
+ NULL
+};
+#endif /* PPP_COMPRESS */
+
+/*
+ * Called from boot code to establish ppp interfaces.
+ */
+void
+pppattach()
+{
+ register struct ppp_softc *sc;
+ register int i = 0;
+
+ 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_ioctl = pppioctl;
+ sc->sc_if.if_output = pppoutput;
+ sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
+ sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
+ if_attach(&sc->sc_if);
+#if NBPFILTER > 0
+ bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
+#endif
+ }
+}
+
+/*
+ * 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;
+ break;
+ }
+ if (nppp >= NPPP)
+ 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;
+#ifdef VJC
+ sl_compress_init(&sc->sc_comp);
+#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_if.if_flags |= IFF_RUNNING;
+
+ return sc;
+}
+
+/*
+ * Deallocate a ppp unit.
+ */
+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_inq, m);
+ if (m == NULL)
+ break;
+ m_freem(m);
+ }
+ for (;;) {
+ IF_DEQUEUE(&sc->sc_fastq, m);
+ if (m == NULL)
+ break;
+ m_freem(m);
+ }
+#ifdef PPP_COMPRESS
+ ppp_ccp_closed(sc);
+ sc->sc_xc_state = NULL;
+ sc->sc_rc_state = NULL;
+#endif /* PPP_COMPRESS */
+}
+
+/*
+ * 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;
+{
+ register struct ppp_softc *sc;
+ int error, s, i;
+ struct proc *p = u.u_procp;
+
+ if (!suser())
+ return EPERM;
+
+ 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_outm != NULL) {
+ m_freem(sc->sc_outm);
+ sc->sc_outm = NULL;
+ }
+
+ pppgetm(sc);
+
+ sc->sc_ilen = 0;
+ 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;
+
+ tp->t_sc = (caddr_t) sc;
+ ttyflush(tp, FREAD | FWRITE);
+
+ 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) {
+ m_freem(sc->sc_outm);
+ sc->sc_outm = NULL;
+ m_freem(sc->sc_m);
+ sc->sc_m = NULL;
+ pppdealloc(sc);
+ }
+ }
+ splx(s);
+ return 0;
+}
+
+/*
+ * 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 | TS_NBIO)) {
+ splx(s);
+ return (EWOULDBLOCK);
+ }
+ sleep((caddr_t) &tp->t_rawq, TTIPRI);
+ }
+ 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_READ, 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, *p;
+ 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);
+ }
+ if (uio->uio_resid >= CLBYTES / 2) {
+ MCLGET(m, p);
+ } else
+ m->m_len = MLEN;
+ len = MIN(m->m_len, uio->uio_resid);
+ if (error = uiomove(mtod(m, u_char *), len, UIO_WRITE, 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_off += PPP_HDRLEN;
+ m0->m_len -= PPP_HDRLEN;
+ return (pppoutput(&sc->sc_if, m0, &dst));
+}
+
+/*
+ * Line specific (tty) ioctl routine.
+ * Provide a way to get the ppp unit number.
+ * 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)
+ struct tty *tp;
+ caddr_t data;
+ int cmd, flag;
+{
+ register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
+ struct proc *p = u.u_procp;
+ int s, error, flags, mru, nb, npx;
+ struct ppp_option_data *odp;
+ struct compressor **cp;
+ struct npioctl *npi;
+ u_char ccp_option[CCP_MAX_OPTION_LENGTH];
+
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return -1;
+
+ 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 (!suser())
+ return EPERM;
+ flags = *(int *)data & SC_MASK;
+ s = splimp();
+ if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
+ ppp_ccp_closed(sc);
+ sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
+ splx(s);
+ break;
+
+ case PPPIOCSASYNCMAP:
+ if (!suser())
+ return EPERM;
+ sc->sc_asyncmap[0] = *(u_int *)data;
+ break;
+
+ case PPPIOCGASYNCMAP:
+ *(u_int *)data = sc->sc_asyncmap[0];
+ break;
+
+ case PPPIOCSRASYNCMAP:
+ if (!suser())
+ return EPERM;
+ sc->sc_rasyncmap = *(u_int *)data;
+ break;
+
+ case PPPIOCGRASYNCMAP:
+ *(u_int *)data = sc->sc_rasyncmap;
+ break;
+
+ case PPPIOCSXASYNCMAP:
+ if (!suser())
+ return EPERM;
+ 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 */
+ break;
+
+ case PPPIOCGXASYNCMAP:
+ bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
+ break;
+
+ case PPPIOCSMRU:
+ if (!suser())
+ return EPERM;
+ mru = *(int *)data;
+ if (mru >= PPP_MRU && mru <= PPP_MAXMRU) {
+ sc->sc_mru = mru;
+ pppgetm(sc);
+ }
+ break;
+
+ case PPPIOCGMRU:
+ *(int *)data = sc->sc_mru;
+ break;
+
+#ifdef VJC
+ case PPPIOCSMAXCID:
+ if (!suser())
+ return EPERM;
+ sl_compress_setup(&sc->sc_comp, *(int *)data);
+ break;
+#endif
+
+ case PPPIOCXFERUNIT:
+ if (!suser())
+ return EPERM;
+ sc->sc_xfer = p->p_pid;
+ break;
+
+#ifdef PPP_COMPRESS
+ case PPPIOCSCOMPRESS:
+ if (!suser())
+ return EPERM;
+ 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 = splimp();
+ 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;
+ }
+ 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;
+ }
+ 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 (!suser())
+ return EPERM;
+ if (npi->mode != sc->sc_npmode[npx]) {
+ s = splimp();
+ sc->sc_npmode[npx] = npi->mode;
+ if (npi->mode != NPMODE_QUEUE)
+ (*sc->sc_start)(sc);
+ splx(s);
+ }
+ }
+ break;
+
+ default:
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * 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);
+}
+
+/*
+ * Queue a packet. Start transmission if not active.
+ * Packet is placed in Information field of PPP frame.
+ */
+int
+pppoutput(ifp, m0, dst)
+ struct ifnet *ifp;
+ struct mbuf *m0;
+ struct sockaddr *dst;
+{
+ 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.
+ */
+ ifq = &ifp->if_snd;
+ 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 is a TCP packet to or from an "interactive" port,
+ * put the packet on the fastq instead.
+ */
+ if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) {
+ register int p = ntohl(((int *)ip)[ip->ip_hl]);
+ if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16))
+ ifq = &sc->sc_fastq;
+ }
+ 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.
+ */
+ if (M_IS_CLUSTER(m0) || m0->m_off < MMINOFF + PPP_HDRLEN) {
+ struct mbuf *m;
+
+ MGET(m, M_DONTWAIT, MT_DATA);
+ if (m == NULL) {
+ m_freem(m0);
+ return (ENOBUFS);
+ }
+ m->m_len = 0;
+ m->m_next = m0;
+ m0 = m;
+ } else
+ m0->m_off -= 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, -1);
+ }
+
+#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();
+ if (IF_QFULL(ifq)) {
+ IF_DROP(ifq);
+ splx(s);
+ sc->sc_if.if_oerrors++;
+ error = ENOBUFS;
+ goto bad;
+ }
+ IF_ENQUEUE(ifq, m0);
+
+ /*
+ * Tell the device to send it out.
+ */
+ if (mode == NPMODE_PASS)
+ (*sc->sc_start)(sc);
+
+ splx(s);
+ return (0);
+
+bad:
+ m_freem(m0);
+ return (error);
+}
+
+/*
+ * Grab another packet off a queue and apply VJ compression,
+ * packet compression, address/control and/or protocol compression
+ * if enabled.
+ */
+struct mbuf *
+ppp_dequeue(sc)
+ struct ppp_softc *sc;
+{
+ int s;
+ struct mbuf *m, *mp, **mpp;
+ u_char *cp;
+ int address, control, protocol;
+ struct ifqueue *ifq;
+ enum NPmode mode;
+
+ s = splimp();
+
+ /*
+ * Scan through the send queues looking for a packet
+ * which can be sent: first the fast queue, then the normal queue.
+ */
+ ifq = &sc->sc_fastq;
+ for (;;) {
+ mpp = &ifq->ifq_head;
+ mp = NULL;
+ while ((m = *mpp) != NULL) {
+ switch (PPP_PROTOCOL(mtod(m, u_char *))) {
+ case PPP_IP:
+ mode = sc->sc_npmode[NP_IP];
+ break;
+ default:
+ mode = NPMODE_PASS;
+ }
+ if (mode == NPMODE_PASS)
+ break;
+ switch (mode) {
+ case NPMODE_DROP:
+ case NPMODE_ERROR:
+ *mpp = m->m_nextpkt;
+ m_freem(m);
+ break;
+ case NPMODE_QUEUE:
+ mpp = &m->m_nextpkt;
+ mp = m;
+ break;
+ }
+ }
+ if (m != NULL)
+ break;
+
+ if (ifq == &sc->sc_if.if_snd)
+ break;
+ /* Finished the fast queue; do the normal queue. */
+ ifq = &sc->sc_if.if_snd;
+ }
+
+ if (m == NULL) {
+ splx(s);
+ return NULL;
+ }
+
+ if ((*mpp = m->m_nextpkt) == NULL)
+ ifq->ifq_tail = mp;
+ m->m_nextpkt = NULL;
+ --ifq->ifq_len;
+
+ splx(s);
+
+ /*
+ * 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) {
+#ifdef VJC
+ case PPP_IP:
+ /*
+ * 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 = sl_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 */
+ }
+ }
+ break;
+#endif /* VJC */
+
+#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_off += 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_off;
+ --m->m_len;
+ }
+
+ return m;
+}
+
+#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;
+ struct bsd_db *db;
+
+ /*
+ * 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)
+ sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
+ 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)) {
+ sc->sc_flags |= SC_COMP_RUN;
+ }
+ } 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, sc->sc_mru,
+ sc->sc_flags & SC_DEBUG)) {
+ sc->sc_flags |= SC_DECOMP_RUN;
+ sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
+ }
+ }
+ }
+ 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);
+ sc->sc_flags &= ~SC_DC_ERROR;
+ }
+ }
+ }
+ break;
+ }
+}
+
+/*
+ * CCP is down; free (de)compressor state if necessary.
+ */
+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_COMRPESS */
+
+/*
+ * This gets called from pppoutput when a new packet is
+ * put on a queue.
+ */
+static
+pppasyncstart(sc)
+ register struct ppp_softc *sc;
+{
+ register struct tty *tp = (struct tty *) sc->sc_devp;
+
+ pppstart(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;
+ struct mbuf *m2;
+
+ if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0) {
+ /* sorry, I can't talk now */
+ return;
+ }
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp) {
+ (*tp->t_oproc)(tp);
+ return;
+ }
+
+ for (;;) {
+ /*
+ * If there is more in the output queue, just send it now.
+ * We are being called in lieu of ttstart and must do what
+ * it would.
+ */
+ if (CCOUNT(&tp->t_outq) != 0 && tp->t_oproc != NULL) {
+ (*tp->t_oproc)(tp);
+ if (CCOUNT(&tp->t_outq) > PPP_HIWAT)
+ return;
+ }
+
+ /*
+ * 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)
+ return;
+
+ /*
+ * 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) {
+ 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;
+ }
+ }
+
+ if (!done) {
+ m->m_off += m->m_len - len;
+ m->m_len = len;
+ sc->sc_outm = m;
+ if (tp->t_oproc != NULL)
+ (*tp->t_oproc)(tp);
+ return; /* can't do any more at the moment */
+ }
+
+ /* Finished with this mbuf; free it and move on. */
+ MFREE(m, m2);
+ if (m2 == NULL)
+ break;
+
+ m = m2;
+ sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
+ }
+
+ /* Finished a packet */
+ sc->sc_outm = NULL;
+ sc->sc_bytessent++; /* account for closing flag */
+ sc->sc_if.if_opackets++;
+ }
+}
+
+/*
+ * Allocate enough mbuf to handle current MRU.
+ */
+static int
+pppgetm(sc)
+ register struct ppp_softc *sc;
+{
+ struct mbuf *m, **mp, *p;
+ 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) {
+ MGET(m, M_DONTWAIT, MT_DATA);
+ if (m == NULL)
+ break;
+ *mp = m;
+ MCLGET(m, p);
+ }
+ len -= M_DATASIZE(m);
+ mp = &m->m_next;
+ }
+ splx(s);
+ return len <= 0;
+}
+
+/*
+ * 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. The return value is 1 if the packet was put on
+ * sc->sc_inq, 0 otherwise.
+ */
+#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
+ TYPE_UNCOMPRESSED_TCP)
+
+int
+ppppktin(sc, m)
+ struct ppp_softc *sc;
+ struct mbuf *m;
+{
+ struct ifqueue *inq, *lock;
+ int s, ilen, xlen, proto, rv;
+ u_char *cp, adrs, ctrl;
+ struct mbuf *mp, *dmp, *pc;
+ u_char *iphdr;
+ u_int hlen;
+
+ sc->sc_if.if_ipackets++;
+ rv = 0;
+
+ cp = mtod(m, u_char *);
+ adrs = PPP_ADDRESS(cp);
+ ctrl = PPP_CONTROL(cp);
+ proto = PPP_PROTOCOL(cp);
+
+#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);
+ sc->sc_flags |= SC_VJ_RESET;
+ switch (rv) {
+ case DECOMP_OK:
+ /* no error, but no decompressed packet produced */
+ m_freem(m);
+ return 0;
+ case DECOMP_ERROR:
+ sc->sc_flags |= SC_DC_ERROR;
+ break;
+ case DECOMP_FATALERROR:
+ sc->sc_flags |= SC_DC_FERROR;
+ break;
+ }
+ }
+
+ } 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 we've missed a packet, we must toss subsequent compressed
+ * packets which don't have an explicit connection ID.
+ */
+ if (sc->sc_flags & SC_VJ_RESET) {
+ sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &sc->sc_comp);
+ sc->sc_flags &= ~SC_VJ_RESET;
+ }
+
+ /*
+ * 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 = sl_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. */
+ MGET(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, pc);
+ 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_off += 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 = sl_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 an ordinary mbuf, don't waste a
+ * whole cluster on it.
+ */
+ if (ilen <= MLEN && M_IS_CLUSTER(m)) {
+ MGET(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;
+ }
+ }
+
+#if NBPFILTER > 0
+ /* See if bpf wants to look at the packet. */
+ if (sc->sc_bpf)
+ bpf_mtap(sc->sc_bpf, m);
+#endif
+
+ 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 0;
+ }
+ m->m_off += PPP_HDRLEN;
+ m->m_len -= PPP_HDRLEN;
+ schednetisr(NETISR_IP);
+ inq = &ipintrq;
+ 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();
+ lock = inq;
+ smp_lock(&lock->lk_ifqueue, LK_RETRY);
+ if (IF_QFULL(inq)) {
+ IF_DROP(inq);
+ /* XXX should we unlock here? */
+ if (sc->sc_flags & SC_DEBUG)
+ printf("ppp%d: queue full\n", sc->sc_if.if_unit);
+ sc->sc_if.if_ierrors++;
+ m_freem(m);
+ rv = 0;
+ } else {
+ IF_ENQUEUEIF(inq, m, &sc->sc_if);
+ smp_unlock(&lock->lk_ifqueue);
+ }
+
+ splx(s);
+ return rv;
+
+ bad:
+ m_freem(m);
+ sc->sc_if.if_ierrors++;
+ return 0;
+}
+
+/*
+ * 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;
+
+ tk_nin++;
+ sc = (struct ppp_softc *) tp->t_sc;
+ if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ return;
+
+ sc->sc_bytesrcvd++;
+
+ 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;
+
+ 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_VJ_RESET;
+ 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);
+ return;
+ }
+
+ 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++;
+ }
+ return;
+ }
+
+ /*
+ * 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;
+
+ if (sc->sc_flags & SC_LOG_INPKT) {
+ printf("ppp%d: got %d bytes\n", sc->sc_if.if_unit, ilen);
+ pppdumpm(m, ilen);
+ }
+
+ if (ppppktin(sc, m)) {
+ /* Put a placeholder byte in canq for ttselect()/ttnread(). */
+ putc(0, &tp->t_canq);
+ ttwakeup(tp);
+ }
+
+ pppgetm(sc);
+ return;
+ }
+
+ if (sc->sc_flags & SC_FLUSH) {
+ if (sc->sc_flags & SC_LOG_FLUSH)
+ ppplogchar(sc, c);
+ return;
+ }
+
+ if (c < 0x20 && (sc->sc_rasyncmap & (1 << c)))
+ return;
+
+ if (sc->sc_flags & SC_ESCAPED) {
+ sc->sc_flags &= ~SC_ESCAPED;
+ c ^= PPP_TRANS;
+ } else if (c == PPP_ESCAPE) {
+ sc->sc_flags |= SC_ESCAPED;
+ return;
+ }
+
+ /*
+ * 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_off = M_OFFSTART(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_off = M_OFFSTART(m);
+ sc->sc_mp = mtod(m, char *);
+ }
+
+ ++m->m_len;
+ *sc->sc_mp++ = c;
+ sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
+ return;
+
+ 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);
+ }
+}
+
+/*
+ * Process an ioctl request to interface.
+ */
+int
+pppioctl(ifp, cmd, data)
+ register struct ifnet *ifp;
+ int cmd;
+ caddr_t data;
+{
+ struct proc *p = u.u_procp;
+ 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;
+ 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 (!suser())
+ return EPERM;
+ 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 */
+#ifdef PPP_COMPRESS
+ if (sc->sc_xc_state != NULL)
+ (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &psp->c);
+ if (sc->sc_rc_state != NULL)
+ (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &psp->d);
+#endif /* PPP_COMPRESS */
+ break;
+
+ default:
+ error = EINVAL;
+ }
+ splx(s);
+ return (error);
+}
+
+#define MAX_DUMP_BYTES 128
+
+static void
+pppdumpm(m0, pktlen)
+ struct mbuf *m0;
+ int pktlen;
+{
+ char buf[3*MAX_DUMP_BYTES+4];
+ char *bp = buf;
+ struct mbuf *m;
+ static char digits[] = "0123456789abcdef";
+
+ for (m = m0; m && pktlen; m = m->m_next) {
+ int l = m->m_len;
+ u_char *rptr = mtod(m, u_char *);
+
+ if (pktlen > 0) {
+ if (l > pktlen)
+ l = pktlen;
+ pktlen -= l;
+ }
+ 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 && pktlen)
+ *bp++ = '>';
+ *bp = 0;
+ printf("%s\n", buf);
+}
+
+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 */
projects / ppp.git / commitdiff