netbsd-1.1/if_ppp.c

   1 /*      $Id: if_ppp.c,v 1.8 1998/03/25 04:04:37 paulus Exp $    */
   2
   3 /*
   4  * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
   5  *
   6  * Copyright (c) 1989 Carnegie Mellon University.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms are permitted
  10  * provided that the above copyright notice and this paragraph are
  11  * duplicated in all such forms and that any documentation,
  12  * advertising materials, and other materials related to such
  13  * distribution and use acknowledge that the software was developed
  14  * by Carnegie Mellon University.  The name of the
  15  * University may not be used to endorse or promote products derived
  16  * from this software without specific prior written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  19  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Drew D. Perkins
  22  * Carnegie Mellon University
  23  * 4910 Forbes Ave.
  24  * Pittsburgh, PA 15213
  25  * (412) 268-8576
  26  * ddp@andrew.cmu.edu
  27  *
  28  * Based on:
  29  *      @(#)if_sl.c     7.6.1.2 (Berkeley) 2/15/89
  30  *
  31  * Copyright (c) 1987 Regents of the University of California.
  32  * All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms are permitted
  35  * provided that the above copyright notice and this paragraph are
  36  * duplicated in all such forms and that any documentation,
  37  * advertising materials, and other materials related to such
  38  * distribution and use acknowledge that the software was developed
  39  * by the University of California, Berkeley.  The name of the
  40  * University may not be used to endorse or promote products derived
  41  * from this software without specific prior written permission.
  42  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  43  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  44  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  45  *
  46  * Serial Line interface
  47  *
  48  * Rick Adams
  49  * Center for Seismic Studies
  50  * 1300 N 17th Street, Suite 1450
  51  * Arlington, Virginia 22209
  52  * (703)276-7900
  53  * rick@seismo.ARPA
  54  * seismo!rick
  55  *
  56  * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
  57  * Converted to 4.3BSD Beta by Chris Torek.
  58  * Other changes made at Berkeley, based in part on code by Kirk Smith.
  59  *
  60  * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
  61  * Added VJ tcp header compression; more unified ioctls
  62  *
  63  * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
  64  * Cleaned up a lot of the mbuf-related code to fix bugs that
  65  * caused system crashes and packet corruption.  Changed pppstart
  66  * so that it doesn't just give up with a collision if the whole
  67  * packet doesn't fit in the output ring buffer.
  68  *
  69  * Added priority queueing for interactive IP packets, following
  70  * the model of if_sl.c, plus hooks for bpf.
  71  * Paul Mackerras (paulus@cs.anu.edu.au).
  72  */
  73
  74 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
  75 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
  76
  77 #include "ppp.h"
  78 #if NPPP > 0
  79
  80 #define VJC
  81 #define PPP_COMPRESS
  82
  83 #include <sys/param.h>
  84 #include <sys/proc.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/socket.h>
  87 #include <sys/ioctl.h>
  88 #include <sys/kernel.h>
  89 #include <sys/systm.h>
  90 #include <sys/time.h>
  91 #include <sys/malloc.h>
  92
  93 #if NetBSD1_0 && defined(i386)
  94 #include <machine/psl.h>
  95 #endif
  96
  97 #include <net/if.h>
  98 #include <net/if_types.h>
  99 #include <net/netisr.h>
 100 #include <net/route.h>
 101 #ifdef PPP_FILTER
 102 #include <net/bpf.h>
 103 #endif
 104
 105 #if INET
 106 #include <netinet/in.h>
 107 #include <netinet/in_systm.h>
 108 #include <netinet/in_var.h>
 109 #include <netinet/ip.h>
 110 #endif
 111
 112 #include "bpfilter.h"
 113 #if NBPFILTER > 0
 114 #include <sys/time.h>
 115 #include <net/bpf.h>
 116 #endif
 117
 118 #ifdef VJC
 119 #include <net/slcompress.h>
 120 #endif
 121
 122 #include <net/ppp_defs.h>
 123 #include <net/if_ppp.h>
 124 #include <net/if_pppvar.h>
 125 #include <machine/cpu.h>
 126
 127 #if NetBSD1_0
 128 #define splsoftnet      splnet
 129 #endif
 130
 131 #ifdef PPP_COMPRESS
 132 #define PACKETPTR       struct mbuf *
 133 #include <net/ppp-comp.h>
 134 #endif
 135
 136 static int      pppsioctl __P((struct ifnet *, u_long, caddr_t));
 137 static void     ppp_requeue __P((struct ppp_softc *));
 138 static void     ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
 139 static void     ppp_ccp_closed __P((struct ppp_softc *));
 140 static void     ppp_inproc __P((struct ppp_softc *, struct mbuf *));
 141 static void     pppdumpm __P((struct mbuf *m0));
 142
 143 /*
 144  * Some useful mbuf macros not in mbuf.h.
 145  */
 146 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
 147
 148 #define M_DATASTART(m)  \
 149         (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
 150             (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
 151
 152 #define M_DATASIZE(m)   \
 153         (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
 154             (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
 155
 156 /*
 157  * We steal two bits in the mbuf m_flags, to mark high-priority packets
 158  * for output, and received packets following lost/corrupted packets.
 159  */
 160 #define M_HIGHPRI       0x2000  /* output packet for sc_fastq */
 161 #define M_ERRMARK       0x4000  /* steal a bit in mbuf m_flags */
 162
 163
 164 #ifdef PPP_COMPRESS
 165 /*
 166  * List of compressors we know about.
 167  * We leave some space so maybe we can modload compressors.
 168  */
 169
 170 extern struct compressor ppp_bsd_compress;
 171 extern struct compressor ppp_deflate, ppp_deflate_draft;
 172
 173 struct compressor *ppp_compressors[8] = {
 174 #if DO_BSD_COMPRESS
 175     &ppp_bsd_compress,
 176 #endif
 177 #if DO_DEFLATE
 178     &ppp_deflate,
 179     &ppp_deflate_draft,
 180 #endif
 181     NULL
 182 };
 183 #endif /* PPP_COMPRESS */
 184
 185
 186 /*
 187  * Called from boot code to establish ppp interfaces.
 188  */
 189 void
 190 pppattach()
 191 {
 192     register struct ppp_softc *sc;
 193     register int i = 0;
 194
 195     for (sc = ppp_softc; i < NPPP; sc++) {
 196         sc->sc_if.if_name = "ppp";
 197         sc->sc_if.if_unit = i++;
 198         sc->sc_if.if_mtu = PPP_MTU;
 199         sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
 200         sc->sc_if.if_type = IFT_PPP;
 201         sc->sc_if.if_hdrlen = PPP_HDRLEN;
 202         sc->sc_if.if_ioctl = pppsioctl;
 203         sc->sc_if.if_output = pppoutput;
 204         sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
 205         sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
 206         sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
 207         sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
 208         if_attach(&sc->sc_if);
 209 #if NBPFILTER > 0
 210         bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
 211 #endif
 212     }
 213
 214 #if NetBSD1_0 && defined(i386)
 215     /*
 216      * XXX kludge to fix the bug in the i386 interrupt handling code,
 217      * where software interrupts could be taken while hardware
 218      * interrupts were blocked.
 219      */
 220     if ((imask[IPL_TTY] & (1 << SIR_NET)) == 0) {
 221         imask[IPL_TTY] |= (1 << SIR_NET);
 222         intr_calculatemasks();
 223     }
 224 #endif
 225 }
 226
 227 /*
 228  * Allocate a ppp interface unit and initialize it.
 229  */
 230 struct ppp_softc *
 231 pppalloc(pid)
 232     pid_t pid;
 233 {
 234     int nppp, i;
 235     struct ppp_softc *sc;
 236
 237     for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
 238         if (sc->sc_xfer == pid) {
 239             sc->sc_xfer = 0;
 240             return sc;
 241         }
 242     for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
 243         if (sc->sc_devp == NULL)
 244             break;
 245     if (nppp >= NPPP)
 246         return NULL;
 247
 248     sc->sc_flags = 0;
 249     sc->sc_mru = PPP_MRU;
 250     sc->sc_relinq = NULL;
 251     bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
 252 #ifdef VJC
 253     MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
 254            M_DEVBUF, M_NOWAIT);
 255     if (sc->sc_comp)
 256         sl_compress_init(sc->sc_comp, -1);
 257 #endif
 258 #ifdef PPP_COMPRESS
 259     sc->sc_xc_state = NULL;
 260     sc->sc_rc_state = NULL;
 261 #endif /* PPP_COMPRESS */
 262     for (i = 0; i < NUM_NP; ++i)
 263         sc->sc_npmode[i] = NPMODE_ERROR;
 264     sc->sc_npqueue = NULL;
 265     sc->sc_npqtail = &sc->sc_npqueue;
 266     sc->sc_last_sent = sc->sc_last_recv = time.tv_sec;
 267
 268     return sc;
 269 }
 270
 271 /*
 272  * Deallocate a ppp unit.  Must be called at splsoftnet or higher.
 273  */
 274 void
 275 pppdealloc(sc)
 276     struct ppp_softc *sc;
 277 {
 278     struct mbuf *m;
 279
 280     if_down(&sc->sc_if);
 281     sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
 282     sc->sc_devp = NULL;
 283     sc->sc_xfer = 0;
 284     for (;;) {
 285         IF_DEQUEUE(&sc->sc_rawq, m);
 286         if (m == NULL)
 287             break;
 288         m_freem(m);
 289     }
 290     for (;;) {
 291         IF_DEQUEUE(&sc->sc_inq, m);
 292         if (m == NULL)
 293             break;
 294         m_freem(m);
 295     }
 296     for (;;) {
 297         IF_DEQUEUE(&sc->sc_fastq, m);
 298         if (m == NULL)
 299             break;
 300         m_freem(m);
 301     }
 302     while ((m = sc->sc_npqueue) != NULL) {
 303         sc->sc_npqueue = m->m_nextpkt;
 304         m_freem(m);
 305     }
 306     if (sc->sc_togo != NULL) {
 307         m_freem(sc->sc_togo);
 308         sc->sc_togo = NULL;
 309     }
 310 #ifdef PPP_COMPRESS
 311     ppp_ccp_closed(sc);
 312     sc->sc_xc_state = NULL;
 313     sc->sc_rc_state = NULL;
 314 #endif /* PPP_COMPRESS */
 315 #ifdef PPP_FILTER
 316     if (sc->sc_pass_filt.bf_insns != 0) {
 317         FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF);
 318         sc->sc_pass_filt.bf_insns = 0;
 319         sc->sc_pass_filt.bf_len = 0;
 320     }
 321     if (sc->sc_active_filt.bf_insns != 0) {
 322         FREE(sc->sc_active_filt.bf_insns, M_DEVBUF);
 323         sc->sc_active_filt.bf_insns = 0;
 324         sc->sc_active_filt.bf_len = 0;
 325     }
 326 #endif /* PPP_FILTER */
 327 #ifdef VJC
 328     if (sc->sc_comp != 0) {
 329         FREE(sc->sc_comp, M_DEVBUF);
 330         sc->sc_comp = 0;
 331     }
 332 #endif
 333 }
 334
 335 /*
 336  * Ioctl routine for generic ppp devices.
 337  */
 338 int
 339 pppioctl(sc, cmd, data, flag, p)
 340     struct ppp_softc *sc;
 341     u_long cmd;
 342     caddr_t data;
 343     int flag;
 344     struct proc *p;
 345 {
 346     int s, error, flags, mru, nb, npx;
 347     struct ppp_option_data *odp;
 348     struct compressor **cp;
 349     struct npioctl *npi;
 350     time_t t;
 351 #ifdef PPP_FILTER
 352     struct bpf_program *bp, *nbp;
 353     struct bpf_insn *newcode, *oldcode;
 354     int newcodelen;
 355 #endif /* PPP_FILTER */
 356 #ifdef  PPP_COMPRESS
 357     u_char ccp_option[CCP_MAX_OPTION_LENGTH];
 358 #endif
 359
 360     switch (cmd) {
 361     case FIONREAD:
 362         *(int *)data = sc->sc_inq.ifq_len;
 363         break;
 364
 365     case PPPIOCGUNIT:
 366         *(int *)data = sc->sc_if.if_unit;
 367         break;
 368
 369     case PPPIOCGFLAGS:
 370         *(u_int *)data = sc->sc_flags;
 371         break;
 372
 373     case PPPIOCSFLAGS:
 374         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 375             return (error);
 376         flags = *(int *)data & SC_MASK;
 377         s = splsoftnet();
 378 #ifdef PPP_COMPRESS
 379         if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
 380             ppp_ccp_closed(sc);
 381 #endif
 382         splimp();
 383         sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
 384         splx(s);
 385         break;
 386
 387     case PPPIOCSMRU:
 388         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 389             return (error);
 390         mru = *(int *)data;
 391         if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
 392             sc->sc_mru = mru;
 393         break;
 394
 395     case PPPIOCGMRU:
 396         *(int *)data = sc->sc_mru;
 397         break;
 398
 399 #ifdef VJC
 400     case PPPIOCSMAXCID:
 401         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 402             return (error);
 403         if (sc->sc_comp) {
 404             s = splsoftnet();
 405             sl_compress_init(sc->sc_comp, *(int *)data);
 406             splx(s);
 407         }
 408         break;
 409 #endif
 410
 411     case PPPIOCXFERUNIT:
 412         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 413             return (error);
 414         sc->sc_xfer = p->p_pid;
 415         break;
 416
 417 #ifdef PPP_COMPRESS
 418     case PPPIOCSCOMPRESS:
 419         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 420             return (error);
 421         odp = (struct ppp_option_data *) data;
 422         nb = odp->length;
 423         if (nb > sizeof(ccp_option))
 424             nb = sizeof(ccp_option);
 425         if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
 426             return (error);
 427         if (ccp_option[1] < 2)  /* preliminary check on the length byte */
 428             return (EINVAL);
 429         for (cp = ppp_compressors; *cp != NULL; ++cp)
 430             if ((*cp)->compress_proto == ccp_option[0]) {
 431                 /*
 432                  * Found a handler for the protocol - try to allocate
 433                  * a compressor or decompressor.
 434                  */
 435                 error = 0;
 436                 if (odp->transmit) {
 437                     s = splsoftnet();
 438                     if (sc->sc_xc_state != NULL)
 439                         (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
 440                     sc->sc_xcomp = *cp;
 441                     sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
 442                     if (sc->sc_xc_state == NULL) {
 443                         if (sc->sc_flags & SC_DEBUG)
 444                             printf("ppp%d: comp_alloc failed\n",
 445                                sc->sc_if.if_unit);
 446                         error = ENOBUFS;
 447                     }
 448                     splimp();
 449                     sc->sc_flags &= ~SC_COMP_RUN;
 450                     splx(s);
 451                 } else {
 452                     s = splsoftnet();
 453                     if (sc->sc_rc_state != NULL)
 454                         (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
 455                     sc->sc_rcomp = *cp;
 456                     sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
 457                     if (sc->sc_rc_state == NULL) {
 458                         if (sc->sc_flags & SC_DEBUG)
 459                             printf("ppp%d: decomp_alloc failed\n",
 460                                sc->sc_if.if_unit);
 461                         error = ENOBUFS;
 462                     }
 463                     splimp();
 464                     sc->sc_flags &= ~SC_DECOMP_RUN;
 465                     splx(s);
 466                 }
 467                 return (error);
 468             }
 469         if (sc->sc_flags & SC_DEBUG)
 470             printf("ppp%d: no compressor for [%x %x %x], %x\n",
 471                    sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
 472                    ccp_option[2], nb);
 473         return (EINVAL);        /* no handler found */
 474 #endif /* PPP_COMPRESS */
 475
 476     case PPPIOCGNPMODE:
 477     case PPPIOCSNPMODE:
 478         npi = (struct npioctl *) data;
 479         switch (npi->protocol) {
 480         case PPP_IP:
 481             npx = NP_IP;
 482             break;
 483         default:
 484             return EINVAL;
 485         }
 486         if (cmd == PPPIOCGNPMODE) {
 487             npi->mode = sc->sc_npmode[npx];
 488         } else {
 489             if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 490                 return (error);
 491             if (npi->mode != sc->sc_npmode[npx]) {
 492                 s = splsoftnet();
 493                 sc->sc_npmode[npx] = npi->mode;
 494                 if (npi->mode != NPMODE_QUEUE) {
 495                     ppp_requeue(sc);
 496                     (*sc->sc_start)(sc);
 497                 }
 498                 splx(s);
 499             }
 500         }
 501         break;
 502
 503     case PPPIOCGIDLE:
 504         s = splsoftnet();
 505         t = time.tv_sec;
 506         ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
 507         ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
 508         splx(s);
 509         break;
 510
 511 #ifdef PPP_FILTER
 512     case PPPIOCSPASS:
 513     case PPPIOCSACTIVE:
 514         nbp = (struct bpf_program *) data;
 515         if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
 516             return EINVAL;
 517         newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
 518         if (newcodelen != 0) {
 519             MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK);
 520             if (newcode == 0) {
 521                 return EINVAL;          /* or sumpin */
 522             }
 523             if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
 524                                newcodelen)) != 0) {
 525                 FREE(newcode, M_DEVBUF);
 526                 return error;
 527             }
 528             if (!bpf_validate(newcode, nbp->bf_len)) {
 529                 FREE(newcode, M_DEVBUF);
 530                 return EINVAL;
 531             }
 532         } else
 533             newcode = 0;
 534         bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
 535         oldcode = bp->bf_insns;
 536         s = splimp();
 537         bp->bf_len = nbp->bf_len;
 538         bp->bf_insns = newcode;
 539         splx(s);
 540         if (oldcode != 0)
 541             FREE(oldcode, M_DEVBUF);
 542         break;
 543 #endif
 544
 545     default:
 546         return (-1);
 547     }
 548     return (0);
 549 }
 550
 551 /*
 552  * Process an ioctl request to the ppp network interface.
 553  */
 554 static int
 555 pppsioctl(ifp, cmd, data)
 556     register struct ifnet *ifp;
 557     u_long cmd;
 558     caddr_t data;
 559 {
 560     struct proc *p = curproc;   /* XXX */
 561     register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
 562     register struct ifaddr *ifa = (struct ifaddr *)data;
 563     register struct ifreq *ifr = (struct ifreq *)data;
 564     struct ppp_stats *psp;
 565 #ifdef  PPP_COMPRESS
 566     struct ppp_comp_stats *pcp;
 567 #endif
 568     int s = splimp(), error = 0;
 569
 570     switch (cmd) {
 571     case SIOCSIFFLAGS:
 572         if ((ifp->if_flags & IFF_RUNNING) == 0)
 573             ifp->if_flags &= ~IFF_UP;
 574         break;
 575
 576     case SIOCSIFADDR:
 577         if (ifa->ifa_addr->sa_family != AF_INET)
 578             error = EAFNOSUPPORT;
 579         break;
 580
 581     case SIOCSIFDSTADDR:
 582         if (ifa->ifa_addr->sa_family != AF_INET)
 583             error = EAFNOSUPPORT;
 584         break;
 585
 586     case SIOCSIFMTU:
 587         if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
 588             break;
 589         sc->sc_if.if_mtu = ifr->ifr_mtu;
 590         break;
 591
 592     case SIOCGIFMTU:
 593         ifr->ifr_mtu = sc->sc_if.if_mtu;
 594         break;
 595
 596     case SIOCADDMULTI:
 597     case SIOCDELMULTI:
 598         if (ifr == 0) {
 599             error = EAFNOSUPPORT;
 600             break;
 601         }
 602         switch(ifr->ifr_addr.sa_family) {
 603 #ifdef INET
 604         case AF_INET:
 605             break;
 606 #endif
 607         default:
 608             error = EAFNOSUPPORT;
 609             break;
 610         }
 611         break;
 612
 613     case SIOCGPPPSTATS:
 614         psp = &((struct ifpppstatsreq *) data)->stats;
 615         bzero(psp, sizeof(*psp));
 616         psp->p = sc->sc_stats;
 617 #if defined(VJC) && !defined(SL_NO_STATS)
 618         if (sc->sc_comp) {
 619             psp->vj.vjs_packets = sc->sc_comp->sls_packets;
 620             psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
 621             psp->vj.vjs_searches = sc->sc_comp->sls_searches;
 622             psp->vj.vjs_misses = sc->sc_comp->sls_misses;
 623             psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
 624             psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
 625             psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
 626             psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
 627         }
 628 #endif /* VJC */
 629         break;
 630
 631 #ifdef PPP_COMPRESS
 632     case SIOCGPPPCSTATS:
 633         pcp = &((struct ifpppcstatsreq *) data)->stats;
 634         bzero(pcp, sizeof(*pcp));
 635         if (sc->sc_xc_state != NULL)
 636             (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
 637         if (sc->sc_rc_state != NULL)
 638             (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
 639         break;
 640 #endif /* PPP_COMPRESS */
 641
 642     default:
 643         error = EINVAL;
 644     }
 645     splx(s);
 646     return (error);
 647 }
 648
 649 /*
 650  * Queue a packet.  Start transmission if not active.
 651  * Packet is placed in Information field of PPP frame.
 652  */
 653 int
 654 pppoutput(ifp, m0, dst, rtp)
 655     struct ifnet *ifp;
 656     struct mbuf *m0;
 657     struct sockaddr *dst;
 658     struct rtentry *rtp;
 659 {
 660     register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
 661     int protocol, address, control;
 662     u_char *cp;
 663     int s, error;
 664     struct ip *ip;
 665     struct ifqueue *ifq;
 666     enum NPmode mode;
 667     int len;
 668     struct mbuf *m;
 669
 670     if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
 671         || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
 672         error = ENETDOWN;       /* sort of */
 673         goto bad;
 674     }
 675
 676     /*
 677      * Compute PPP header.
 678      */
 679     m0->m_flags &= ~M_HIGHPRI;
 680     switch (dst->sa_family) {
 681 #ifdef INET
 682     case AF_INET:
 683         address = PPP_ALLSTATIONS;
 684         control = PPP_UI;
 685         protocol = PPP_IP;
 686         mode = sc->sc_npmode[NP_IP];
 687
 688         /*
 689          * If this packet has the "low delay" bit set in the IP header,
 690          * put it on the fastq instead.
 691          */
 692         ip = mtod(m0, struct ip *);
 693         if (ip->ip_tos & IPTOS_LOWDELAY)
 694             m0->m_flags |= M_HIGHPRI;
 695         break;
 696 #endif
 697     case AF_UNSPEC:
 698         address = PPP_ADDRESS(dst->sa_data);
 699         control = PPP_CONTROL(dst->sa_data);
 700         protocol = PPP_PROTOCOL(dst->sa_data);
 701         mode = NPMODE_PASS;
 702         break;
 703     default:
 704         printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
 705         error = EAFNOSUPPORT;
 706         goto bad;
 707     }
 708
 709     /*
 710      * Drop this packet, or return an error, if necessary.
 711      */
 712     if (mode == NPMODE_ERROR) {
 713         error = ENETDOWN;
 714         goto bad;
 715     }
 716     if (mode == NPMODE_DROP) {
 717         error = 0;
 718         goto bad;
 719     }
 720
 721     /*
 722      * Add PPP header.  If no space in first mbuf, allocate another.
 723      * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
 724      */
 725     if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
 726         m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT);
 727         if (m0 == 0) {
 728             error = ENOBUFS;
 729             goto bad;
 730         }
 731         m0->m_len = 0;
 732     } else
 733         m0->m_data -= PPP_HDRLEN;
 734
 735     cp = mtod(m0, u_char *);
 736     *cp++ = address;
 737     *cp++ = control;
 738     *cp++ = protocol >> 8;
 739     *cp++ = protocol & 0xff;
 740     m0->m_len += PPP_HDRLEN;
 741
 742     len = 0;
 743     for (m = m0; m != 0; m = m->m_next)
 744         len += m->m_len;
 745
 746     if (sc->sc_flags & SC_LOG_OUTPKT) {
 747         printf("ppp%d output: ", ifp->if_unit);
 748         pppdumpm(m0);
 749     }
 750
 751     if ((protocol & 0x8000) == 0) {
 752 #ifdef PPP_FILTER
 753         /*
 754          * Apply the pass and active filters to the packet,
 755          * but only if it is a data packet.
 756          */
 757         *mtod(m0, u_char *) = 1;        /* indicates outbound */
 758         if (sc->sc_pass_filt.bf_insns != 0
 759             && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
 760                           len, 0) == 0) {
 761             error = 0;          /* drop this packet */
 762             goto bad;
 763         }
 764
 765         /*
 766          * Update the time we sent the most recent packet.
 767          */
 768         if (sc->sc_active_filt.bf_insns == 0
 769             || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
 770             sc->sc_last_sent = time.tv_sec;
 771
 772         *mtod(m0, u_char *) = address;
 773 #else
 774         /*
 775          * Update the time we sent the most recent data packet.
 776          */
 777         sc->sc_last_sent = time.tv_sec;
 778 #endif /* PPP_FILTER */
 779     }
 780
 781 #if NBPFILTER > 0
 782     /*
 783      * See if bpf wants to look at the packet.
 784      */
 785     if (sc->sc_bpf)
 786         bpf_mtap(sc->sc_bpf, m0);
 787 #endif
 788
 789     /*
 790      * Put the packet on the appropriate queue.
 791      */
 792     s = splsoftnet();
 793     if (mode == NPMODE_QUEUE) {
 794         /* XXX we should limit the number of packets on this queue */
 795         *sc->sc_npqtail = m0;
 796         m0->m_nextpkt = NULL;
 797         sc->sc_npqtail = &m0->m_nextpkt;
 798     } else {
 799         ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd;
 800         if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
 801             IF_DROP(ifq);
 802             splx(s);
 803             sc->sc_if.if_oerrors++;
 804             sc->sc_stats.ppp_oerrors++;
 805             error = ENOBUFS;
 806             goto bad;
 807         }
 808         IF_ENQUEUE(ifq, m0);
 809         (*sc->sc_start)(sc);
 810     }
 811     ifp->if_lastchange = time;
 812     ifp->if_opackets++;
 813     ifp->if_obytes += len;
 814
 815     splx(s);
 816     return (0);
 817
 818 bad:
 819     m_freem(m0);
 820     return (error);
 821 }
 822
 823 /*
 824  * After a change in the NPmode for some NP, move packets from the
 825  * npqueue to the send queue or the fast queue as appropriate.
 826  * Should be called at splsoftnet.
 827  */
 828 static void
 829 ppp_requeue(sc)
 830     struct ppp_softc *sc;
 831 {
 832     struct mbuf *m, **mpp;
 833     struct ifqueue *ifq;
 834     enum NPmode mode;
 835
 836     for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
 837         switch (PPP_PROTOCOL(mtod(m, u_char *))) {
 838         case PPP_IP:
 839             mode = sc->sc_npmode[NP_IP];
 840             break;
 841         default:
 842             mode = NPMODE_PASS;
 843         }
 844
 845         switch (mode) {
 846         case NPMODE_PASS:
 847             /*
 848              * This packet can now go on one of the queues to be sent.
 849              */
 850             *mpp = m->m_nextpkt;
 851             m->m_nextpkt = NULL;
 852             ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd;
 853             if (IF_QFULL(ifq)) {
 854                 IF_DROP(ifq);
 855                 sc->sc_if.if_oerrors++;
 856                 sc->sc_stats.ppp_oerrors++;
 857             } else
 858                 IF_ENQUEUE(ifq, m);
 859             break;
 860
 861         case NPMODE_DROP:
 862         case NPMODE_ERROR:
 863             *mpp = m->m_nextpkt;
 864             m_freem(m);
 865             break;
 866
 867         case NPMODE_QUEUE:
 868             mpp = &m->m_nextpkt;
 869             break;
 870         }
 871     }
 872     sc->sc_npqtail = mpp;
 873 }
 874
 875 /*
 876  * Transmitter has finished outputting some stuff;
 877  * remember to call sc->sc_start later at splsoftnet.
 878  */
 879 void
 880 ppp_restart(sc)
 881     struct ppp_softc *sc;
 882 {
 883     int s = splimp();
 884
 885     sc->sc_flags &= ~SC_TBUSY;
 886     schednetisr(NETISR_PPP);
 887     splx(s);
 888 }
 889
 890 /*
 891  * Get a packet to send.  This procedure is intended to be called at
 892  * splsoftnet, since it may involve time-consuming operations such as
 893  * applying VJ compression, packet compression, address/control and/or
 894  * protocol field compression to the packet.
 895  */
 896 struct mbuf *
 897 ppp_dequeue(sc)
 898     struct ppp_softc *sc;
 899 {
 900     struct mbuf *m, *mp;
 901     u_char *cp;
 902     int address, control, protocol;
 903
 904     /*
 905      * Grab a packet to send: first try the fast queue, then the
 906      * normal queue.
 907      */
 908     IF_DEQUEUE(&sc->sc_fastq, m);
 909     if (m == NULL)
 910         IF_DEQUEUE(&sc->sc_if.if_snd, m);
 911     if (m == NULL)
 912         return NULL;
 913
 914     ++sc->sc_stats.ppp_opackets;
 915
 916     /*
 917      * Extract the ppp header of the new packet.
 918      * The ppp header will be in one mbuf.
 919      */
 920     cp = mtod(m, u_char *);
 921     address = PPP_ADDRESS(cp);
 922     control = PPP_CONTROL(cp);
 923     protocol = PPP_PROTOCOL(cp);
 924
 925     switch (protocol) {
 926     case PPP_IP:
 927 #ifdef VJC
 928         /*
 929          * If the packet is a TCP/IP packet, see if we can compress it.
 930          */
 931         if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
 932             struct ip *ip;
 933             int type;
 934
 935             mp = m;
 936             ip = (struct ip *) (cp + PPP_HDRLEN);
 937             if (mp->m_len <= PPP_HDRLEN) {
 938                 mp = mp->m_next;
 939                 if (mp == NULL)
 940                     break;
 941                 ip = mtod(mp, struct ip *);
 942             }
 943             /* this code assumes the IP/TCP header is in one non-shared mbuf */
 944             if (ip->ip_p == IPPROTO_TCP) {
 945                 type = sl_compress_tcp(mp, ip, sc->sc_comp,
 946                                        !(sc->sc_flags & SC_NO_TCP_CCID));
 947                 switch (type) {
 948                 case TYPE_UNCOMPRESSED_TCP:
 949                     protocol = PPP_VJC_UNCOMP;
 950                     break;
 951                 case TYPE_COMPRESSED_TCP:
 952                     protocol = PPP_VJC_COMP;
 953                     cp = mtod(m, u_char *);
 954                     cp[0] = address;    /* header has moved */
 955                     cp[1] = control;
 956                     cp[2] = 0;
 957                     break;
 958                 }
 959                 cp[3] = protocol;       /* update protocol in PPP header */
 960             }
 961         }
 962 #endif  /* VJC */
 963         break;
 964
 965 #ifdef PPP_COMPRESS
 966     case PPP_CCP:
 967         ppp_ccp(sc, m, 0);
 968         break;
 969 #endif  /* PPP_COMPRESS */
 970     }
 971
 972 #ifdef PPP_COMPRESS
 973     if (protocol != PPP_LCP && protocol != PPP_CCP
 974         && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
 975         struct mbuf *mcomp = NULL;
 976         int slen, clen;
 977
 978         slen = 0;
 979         for (mp = m; mp != NULL; mp = mp->m_next)
 980             slen += mp->m_len;
 981         clen = (*sc->sc_xcomp->compress)
 982             (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
 983         if (mcomp != NULL) {
 984             if (sc->sc_flags & SC_CCP_UP) {
 985                 /* Send the compressed packet instead of the original. */
 986                 m_freem(m);
 987                 m = mcomp;
 988                 cp = mtod(m, u_char *);
 989                 protocol = cp[3];
 990             } else {
 991                 /* Can't transmit compressed packets until CCP is up. */
 992                 m_freem(mcomp);
 993             }
 994         }
 995     }
 996 #endif  /* PPP_COMPRESS */
 997
 998     /*
 999      * Compress the address/control and protocol, if possible.
1000      */
1001     if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
1002         control == PPP_UI && protocol != PPP_ALLSTATIONS &&
1003         protocol != PPP_LCP) {
1004         /* can compress address/control */
1005         m->m_data += 2;
1006         m->m_len -= 2;
1007     }
1008     if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
1009         /* can compress protocol */
1010         if (mtod(m, u_char *) == cp) {
1011             cp[2] = cp[1];      /* move address/control up */
1012             cp[1] = cp[0];
1013         }
1014         ++m->m_data;
1015         --m->m_len;
1016     }
1017
1018     return m;
1019 }
1020
1021 /*
1022  * Software interrupt routine, called at splsoftnet.
1023  */
1024 void
1025 pppintr()
1026 {
1027     struct ppp_softc *sc;
1028     int i, s, s2;
1029     struct mbuf *m;
1030
1031     sc = ppp_softc;
1032     s = splsoftnet();
1033     for (i = 0; i < NPPP; ++i, ++sc) {
1034         if (!(sc->sc_flags & SC_TBUSY)
1035             && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
1036             s2 = splimp();
1037             sc->sc_flags |= SC_TBUSY;
1038             splx(s2);
1039             (*sc->sc_start)(sc);
1040         }
1041         for (;;) {
1042             s2 = splimp();
1043             IF_DEQUEUE(&sc->sc_rawq, m);
1044             splx(s2);
1045             if (m == NULL)
1046                 break;
1047             ppp_inproc(sc, m);
1048         }
1049     }
1050     splx(s);
1051 }
1052
1053 #ifdef PPP_COMPRESS
1054 /*
1055  * Handle a CCP packet.  `rcvd' is 1 if the packet was received,
1056  * 0 if it is about to be transmitted.
1057  */
1058 static void
1059 ppp_ccp(sc, m, rcvd)
1060     struct ppp_softc *sc;
1061     struct mbuf *m;
1062     int rcvd;
1063 {
1064     u_char *dp, *ep;
1065     struct mbuf *mp;
1066     int slen, s;
1067
1068     /*
1069      * Get a pointer to the data after the PPP header.
1070      */
1071     if (m->m_len <= PPP_HDRLEN) {
1072         mp = m->m_next;
1073         if (mp == NULL)
1074             return;
1075         dp = (mp != NULL)? mtod(mp, u_char *): NULL;
1076     } else {
1077         mp = m;
1078         dp = mtod(mp, u_char *) + PPP_HDRLEN;
1079     }
1080
1081     ep = mtod(mp, u_char *) + mp->m_len;
1082     if (dp + CCP_HDRLEN > ep)
1083         return;
1084     slen = CCP_LENGTH(dp);
1085     if (dp + slen > ep) {
1086         if (sc->sc_flags & SC_DEBUG)
1087             printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
1088                    dp, slen, mtod(mp, u_char *), mp->m_len);
1089         return;
1090     }
1091
1092     switch (CCP_CODE(dp)) {
1093     case CCP_CONFREQ:
1094     case CCP_TERMREQ:
1095     case CCP_TERMACK:
1096         /* CCP must be going down - disable compression */
1097         if (sc->sc_flags & SC_CCP_UP) {
1098             s = splimp();
1099             sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1100             splx(s);
1101         }
1102         break;
1103
1104     case CCP_CONFACK:
1105         if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1106             && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1107             && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1108             if (!rcvd) {
1109                 /* we're agreeing to send compressed packets. */
1110                 if (sc->sc_xc_state != NULL
1111                     && (*sc->sc_xcomp->comp_init)
1112                         (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1113                          sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
1114                     s = splimp();
1115                     sc->sc_flags |= SC_COMP_RUN;
1116                     splx(s);
1117                 }
1118             } else {
1119                 /* peer is agreeing to send compressed packets. */
1120                 if (sc->sc_rc_state != NULL
1121                     && (*sc->sc_rcomp->decomp_init)
1122                         (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1123                          sc->sc_if.if_unit, 0, sc->sc_mru,
1124                          sc->sc_flags & SC_DEBUG)) {
1125                     s = splimp();
1126                     sc->sc_flags |= SC_DECOMP_RUN;
1127                     sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1128                     splx(s);
1129                 }
1130             }
1131         }
1132         break;
1133
1134     case CCP_RESETACK:
1135         if (sc->sc_flags & SC_CCP_UP) {
1136             if (!rcvd) {
1137                 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1138                     (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1139             } else {
1140                 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1141                     (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1142                     s = splimp();
1143                     sc->sc_flags &= ~SC_DC_ERROR;
1144                     splx(s);
1145                 }
1146             }
1147         }
1148         break;
1149     }
1150 }
1151
1152 /*
1153  * CCP is down; free (de)compressor state if necessary.
1154  */
1155 static void
1156 ppp_ccp_closed(sc)
1157     struct ppp_softc *sc;
1158 {
1159     if (sc->sc_xc_state) {
1160         (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1161         sc->sc_xc_state = NULL;
1162     }
1163     if (sc->sc_rc_state) {
1164         (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1165         sc->sc_rc_state = NULL;
1166     }
1167 }
1168 #endif /* PPP_COMPRESS */
1169
1170 /*
1171  * PPP packet input routine.
1172  * The caller has checked and removed the FCS and has inserted
1173  * the address/control bytes and the protocol high byte if they
1174  * were omitted.
1175  */
1176 void
1177 ppppktin(sc, m, lost)
1178     struct ppp_softc *sc;
1179     struct mbuf *m;
1180     int lost;
1181 {
1182     int s = splimp();
1183
1184     if (lost)
1185         m->m_flags |= M_ERRMARK;
1186     IF_ENQUEUE(&sc->sc_rawq, m);
1187     schednetisr(NETISR_PPP);
1188     splx(s);
1189 }
1190
1191 /*
1192  * Process a received PPP packet, doing decompression as necessary.
1193  * Should be called at splsoftnet.
1194  */
1195 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1196                          TYPE_UNCOMPRESSED_TCP)
1197
1198 static void
1199 ppp_inproc(sc, m)
1200     struct ppp_softc *sc;
1201     struct mbuf *m;
1202 {
1203     struct ifnet *ifp = &sc->sc_if;
1204     struct ifqueue *inq;
1205     int s, ilen, xlen, proto, rv;
1206     u_char *cp, adrs, ctrl;
1207     struct mbuf *mp, *dmp = NULL;
1208     u_char *iphdr;
1209     u_int hlen;
1210
1211     sc->sc_stats.ppp_ipackets++;
1212
1213     if (sc->sc_flags & SC_LOG_INPKT) {
1214         ilen = 0;
1215         for (mp = m; mp != NULL; mp = mp->m_next)
1216             ilen += mp->m_len;
1217         printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
1218         pppdumpm(m);
1219     }
1220
1221     cp = mtod(m, u_char *);
1222     adrs = PPP_ADDRESS(cp);
1223     ctrl = PPP_CONTROL(cp);
1224     proto = PPP_PROTOCOL(cp);
1225
1226     if (m->m_flags & M_ERRMARK) {
1227         m->m_flags &= ~M_ERRMARK;
1228         s = splimp();
1229         sc->sc_flags |= SC_VJ_RESET;
1230         splx(s);
1231     }
1232
1233 #ifdef PPP_COMPRESS
1234     /*
1235      * Decompress this packet if necessary, update the receiver's
1236      * dictionary, or take appropriate action on a CCP packet.
1237      */
1238     if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1239         && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1240         /* decompress this packet */
1241         rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1242         if (rv == DECOMP_OK) {
1243             m_freem(m);
1244             if (dmp == NULL) {
1245                 /* no error, but no decompressed packet produced */
1246                 return;
1247             }
1248             m = dmp;
1249             cp = mtod(m, u_char *);
1250             proto = PPP_PROTOCOL(cp);
1251
1252         } else {
1253             /*
1254              * An error has occurred in decompression.
1255              * Pass the compressed packet up to pppd, which may take
1256              * CCP down or issue a Reset-Req.
1257              */
1258             if (sc->sc_flags & SC_DEBUG)
1259                 printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
1260             s = splimp();
1261             sc->sc_flags |= SC_VJ_RESET;
1262             if (rv == DECOMP_ERROR)
1263                 sc->sc_flags |= SC_DC_ERROR;
1264             else
1265                 sc->sc_flags |= SC_DC_FERROR;
1266             splx(s);
1267         }
1268
1269     } else {
1270         if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1271             (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1272         }
1273         if (proto == PPP_CCP) {
1274             ppp_ccp(sc, m, 1);
1275         }
1276     }
1277 #endif
1278
1279     ilen = 0;
1280     for (mp = m; mp != NULL; mp = mp->m_next)
1281         ilen += mp->m_len;
1282
1283 #ifdef VJC
1284     if (sc->sc_flags & SC_VJ_RESET) {
1285         /*
1286          * If we've missed a packet, we must toss subsequent compressed
1287          * packets which don't have an explicit connection ID.
1288          */
1289         if (sc->sc_comp)
1290             sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1291         s = splimp();
1292         sc->sc_flags &= ~SC_VJ_RESET;
1293         splx(s);
1294     }
1295
1296     /*
1297      * See if we have a VJ-compressed packet to uncompress.
1298      */
1299     if (proto == PPP_VJC_COMP) {
1300         if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1301             goto bad;
1302
1303         xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1304                                       ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1305                                       sc->sc_comp, &iphdr, &hlen);
1306
1307         if (xlen <= 0) {
1308             if (sc->sc_flags & SC_DEBUG)
1309                 printf("ppp%d: VJ uncompress failed on type comp\n",
1310                         ifp->if_unit);
1311             goto bad;
1312         }
1313
1314         /* Copy the PPP and IP headers into a new mbuf. */
1315         MGETHDR(mp, M_DONTWAIT, MT_DATA);
1316         if (mp == NULL)
1317             goto bad;
1318         mp->m_len = 0;
1319         mp->m_next = NULL;
1320         if (hlen + PPP_HDRLEN > MHLEN) {
1321             MCLGET(mp, M_DONTWAIT);
1322             if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1323                 m_freem(mp);
1324                 goto bad;       /* lose if big headers and no clusters */
1325             }
1326         }
1327         cp = mtod(mp, u_char *);
1328         cp[0] = adrs;
1329         cp[1] = ctrl;
1330         cp[2] = 0;
1331         cp[3] = PPP_IP;
1332         proto = PPP_IP;
1333         bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1334         mp->m_len = hlen + PPP_HDRLEN;
1335
1336         /*
1337          * Trim the PPP and VJ headers off the old mbuf
1338          * and stick the new and old mbufs together.
1339          */
1340         m->m_data += PPP_HDRLEN + xlen;
1341         m->m_len -= PPP_HDRLEN + xlen;
1342         if (m->m_len <= M_TRAILINGSPACE(mp)) {
1343             bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1344             mp->m_len += m->m_len;
1345             MFREE(m, mp->m_next);
1346         } else
1347             mp->m_next = m;
1348         m = mp;
1349         ilen += hlen - xlen;
1350
1351     } else if (proto == PPP_VJC_UNCOMP) {
1352         if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1353             goto bad;
1354
1355         xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1356                                       ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1357                                       sc->sc_comp, &iphdr, &hlen);
1358
1359         if (xlen < 0) {
1360             if (sc->sc_flags & SC_DEBUG)
1361                 printf("ppp%d: VJ uncompress failed on type uncomp\n",
1362                         ifp->if_unit);
1363             goto bad;
1364         }
1365
1366         proto = PPP_IP;
1367         cp[3] = PPP_IP;
1368     }
1369 #endif /* VJC */
1370
1371     /*
1372      * If the packet will fit in a header mbuf, don't waste a
1373      * whole cluster on it.
1374      */
1375     if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
1376         MGETHDR(mp, M_DONTWAIT, MT_DATA);
1377         if (mp != NULL) {
1378             m_copydata(m, 0, ilen, mtod(mp, caddr_t));
1379             m_freem(m);
1380             m = mp;
1381             m->m_len = ilen;
1382         }
1383     }
1384     m->m_pkthdr.len = ilen;
1385     m->m_pkthdr.rcvif = ifp;
1386
1387     if ((proto & 0x8000) == 0) {
1388 #ifdef PPP_FILTER
1389         /*
1390          * See whether we want to pass this packet, and
1391          * if it counts as link activity.
1392          */
1393         adrs = *mtod(m, u_char *);      /* save address field */
1394         *mtod(m, u_char *) = 0;         /* indicate inbound */
1395         if (sc->sc_pass_filt.bf_insns != 0
1396             && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
1397                           ilen, 0) == 0) {
1398             /* drop this packet */
1399             m_freem(m);
1400             return;
1401         }
1402         if (sc->sc_active_filt.bf_insns == 0
1403             || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
1404             sc->sc_last_recv = time.tv_sec;
1405
1406         *mtod(m, u_char *) = adrs;
1407 #else
1408         /*
1409          * Record the time that we received this packet.
1410          */
1411         sc->sc_last_recv = time.tv_sec;
1412 #endif /* PPP_FILTER */
1413     }
1414
1415 #if NBPFILTER > 0
1416     /* See if bpf wants to look at the packet. */
1417     if (sc->sc_bpf)
1418         bpf_mtap(sc->sc_bpf, m);
1419 #endif
1420
1421     rv = 0;
1422     switch (proto) {
1423 #ifdef INET
1424     case PPP_IP:
1425         /*
1426          * IP packet - take off the ppp header and pass it up to IP.
1427          */
1428         if ((ifp->if_flags & IFF_UP) == 0
1429             || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1430             /* interface is down - drop the packet. */
1431             m_freem(m);
1432             return;
1433         }
1434         m->m_pkthdr.len -= PPP_HDRLEN;
1435         m->m_data += PPP_HDRLEN;
1436         m->m_len -= PPP_HDRLEN;
1437         schednetisr(NETISR_IP);
1438         inq = &ipintrq;
1439         break;
1440 #endif
1441
1442     default:
1443         /*
1444          * Some other protocol - place on input queue for read().
1445          */
1446         inq = &sc->sc_inq;
1447         rv = 1;
1448         break;
1449     }
1450
1451     /*
1452      * Put the packet on the appropriate input queue.
1453      */
1454     s = splimp();
1455     if (IF_QFULL(inq)) {
1456         IF_DROP(inq);
1457         splx(s);
1458         if (sc->sc_flags & SC_DEBUG)
1459             printf("ppp%d: input queue full\n", ifp->if_unit);
1460         ifp->if_iqdrops++;
1461         goto bad;
1462     }
1463     IF_ENQUEUE(inq, m);
1464     splx(s);
1465     ifp->if_ipackets++;
1466     ifp->if_ibytes += ilen;
1467     ifp->if_lastchange = time;
1468
1469     if (rv)
1470         (*sc->sc_ctlp)(sc);
1471
1472     return;
1473
1474  bad:
1475     m_freem(m);
1476     sc->sc_if.if_ierrors++;
1477     sc->sc_stats.ppp_ierrors++;
1478 }
1479
1480 #define MAX_DUMP_BYTES  128
1481
1482 static void
1483 pppdumpm(m0)
1484     struct mbuf *m0;
1485 {
1486     char buf[3*MAX_DUMP_BYTES+4];
1487     char *bp = buf;
1488     struct mbuf *m;
1489     static char digits[] = "0123456789abcdef";
1490
1491     for (m = m0; m; m = m->m_next) {
1492         int l = m->m_len;
1493         u_char *rptr = (u_char *)m->m_data;
1494
1495         while (l--) {
1496             if (bp > buf + sizeof(buf) - 4)
1497                 goto done;
1498             *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
1499             *bp++ = digits[*rptr++ & 0xf];
1500         }
1501
1502         if (m->m_next) {
1503             if (bp > buf + sizeof(buf) - 3)
1504                 goto done;
1505             *bp++ = '|';
1506         } else
1507             *bp++ = ' ';
1508     }
1509 done:
1510     if (m)
1511         *bp++ = '>';
1512     *bp = 0;
1513     printf("%s\n", buf);
1514 }
1515
1516 #endif  /* NPPP > 0 */