release/src/router/ppp/modules/if_ppp.c

   1 /*
   2  * if_ppp.c - a network interface connected to a STREAMS module.
   3  *
   4  * Copyright (c) 1994 The Australian National University.
   5  * All rights reserved.
   6  *
   7  * Permission to use, copy, modify, and distribute this software and its
   8  * documentation is hereby granted, provided that the above copyright
   9  * notice appears in all copies.  This software is provided without any
  10  * warranty, express or implied. The Australian National University
  11  * makes no representations about the suitability of this software for
  12  * any purpose.
  13  *
  14  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
  15  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
  17  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
  18  * OF SUCH DAMAGE.
  19  *
  20  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
  21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  22  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  23  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
  24  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
  25  * OR MODIFICATIONS.
  26  *
  27  * $Id: if_ppp.c,v 1.1.1.4 2003/10/14 08:09:53 sparq Exp $
  28  */
  29
  30 /*
  31  * This file is used under SunOS 4 and Digital UNIX.
  32  *
  33  * This file provides the glue between PPP and IP.
  34  */
  35
  36 #define INET    1
  37
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/errno.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/socket.h>
  43 #include <net/if.h>
  44 #include <net/netisr.h>
  45 #include <net/ppp_defs.h>
  46 #include <net/pppio.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_var.h>
  49 #ifdef __osf__
  50 #include <sys/ioctl.h>
  51 #include <net/if_types.h>
  52 #else
  53 #include <sys/sockio.h>
  54 #endif
  55 #include "ppp_mod.h"
  56
  57 #include <sys/stream.h>
  58
  59 #ifdef SNIT_SUPPORT
  60 #include <sys/time.h>
  61 #include <net/nit_if.h>
  62 #include <netinet/if_ether.h>
  63 #endif
  64
  65 #ifdef __osf__
  66 #define SIOCSIFMTU SIOCSIPMTU
  67 #define SIOCGIFMTU SIOCRIPMTU
  68 #define IFA_ADDR(ifa)   (*(ifa)->ifa_addr)
  69 #else
  70 #define IFA_ADDR(ifa)   ((ifa)->ifa_addr)
  71 #endif
  72
  73 #define ifr_mtu         ifr_metric
  74
  75 static int if_ppp_open __P((queue_t *, int, int, int));
  76 static int if_ppp_close __P((queue_t *, int));
  77 static int if_ppp_wput __P((queue_t *, mblk_t *));
  78 static int if_ppp_rput __P((queue_t *, mblk_t *));
  79
  80 #define PPP_IF_ID 0x8021
  81 static struct module_info minfo = {
  82     PPP_IF_ID, "if_ppp", 0, INFPSZ, 4096, 128
  83 };
  84
  85 static struct qinit rinit = {
  86     if_ppp_rput, NULL, if_ppp_open, if_ppp_close, NULL, &minfo, NULL
  87 };
  88
  89 static struct qinit winit = {
  90     if_ppp_wput, NULL, NULL, NULL, NULL, &minfo, NULL
  91 };
  92
  93 struct streamtab if_pppinfo = {
  94     &rinit, &winit, NULL, NULL
  95 };
  96
  97 typedef struct if_ppp_state {
  98     int unit;
  99     queue_t *q;
 100     int flags;
 101 } if_ppp_t;
 102
 103 /* Values for flags */
 104 #define DBGLOG          1
 105
 106 static int if_ppp_count;        /* Number of currently-active streams */
 107
 108 static int ppp_nalloc;          /* Number of elements of ifs and states */
 109 static struct ifnet **ifs;      /* Array of pointers to interface structs */
 110 static if_ppp_t **states;       /* Array of pointers to state structs */
 111
 112 static int if_ppp_output __P((struct ifnet *, struct mbuf *,
 113                               struct sockaddr *));
 114 static int if_ppp_ioctl __P((struct ifnet *, u_int, caddr_t));
 115 static struct mbuf *make_mbufs __P((mblk_t *, int));
 116 static mblk_t *make_message __P((struct mbuf *, int));
 117
 118 #ifdef SNIT_SUPPORT
 119 /* Fake ether header for SNIT */
 120 static struct ether_header snit_ehdr = {{0}, {0}, ETHERTYPE_IP};
 121 #endif
 122
 123 #ifndef __osf__
 124 static void ppp_if_detach __P((struct ifnet *));
 125
 126 /*
 127  * Detach all the interfaces before unloading.
 128  * Not sure this works.
 129  */
 130 int
 131 if_ppp_unload()
 132 {
 133     int i;
 134
 135     if (if_ppp_count > 0)
 136         return EBUSY;
 137     for (i = 0; i < ppp_nalloc; ++i)
 138         if (ifs[i] != 0)
 139             ppp_if_detach(ifs[i]);
 140     if (ifs) {
 141         FREE(ifs, ppp_nalloc * sizeof (struct ifnet *));
 142         FREE(states, ppp_nalloc * sizeof (struct if_ppp_t *));
 143     }
 144     ppp_nalloc = 0;
 145     return 0;
 146 }
 147 #endif /* __osf__ */
 148
 149 /*
 150  * STREAMS module entry points.
 151  */
 152 static int
 153 if_ppp_open(q, dev, flag, sflag)
 154     queue_t *q;
 155     int dev;
 156     int flag, sflag;
 157 {
 158     if_ppp_t *sp;
 159
 160     if (q->q_ptr == 0) {
 161         sp = (if_ppp_t *) ALLOC_SLEEP(sizeof (if_ppp_t));
 162         if (sp == 0)
 163             return OPENFAIL;
 164         bzero(sp, sizeof (if_ppp_t));
 165         q->q_ptr = (caddr_t) sp;
 166         WR(q)->q_ptr = (caddr_t) sp;
 167         sp->unit = -1;          /* no interface unit attached at present */
 168         sp->q = WR(q);
 169         sp->flags = 0;
 170         ++if_ppp_count;
 171     }
 172     return 0;
 173 }
 174
 175 static int
 176 if_ppp_close(q, flag)
 177     queue_t *q;
 178     int flag;
 179 {
 180     if_ppp_t *sp;
 181     struct ifnet *ifp;
 182
 183     sp = (if_ppp_t *) q->q_ptr;
 184     if (sp != 0) {
 185         if (sp->flags & DBGLOG)
 186             printf("if_ppp closed, q=%x sp=%x\n", q, sp);
 187         if (sp->unit >= 0) {
 188             if (sp->unit < ppp_nalloc) {
 189                 states[sp->unit] = 0;
 190                 ifp = ifs[sp->unit];
 191                 if (ifp != 0)
 192                     ifp->if_flags &= ~(IFF_UP | IFF_RUNNING);
 193 #ifdef DEBUG
 194             } else {
 195                 printf("if_ppp: unit %d nonexistent!\n", sp->unit);
 196 #endif
 197             }
 198         }
 199         FREE(sp, sizeof (if_ppp_t));
 200         --if_ppp_count;
 201     }
 202     return 0;
 203 }
 204
 205 static int
 206 if_ppp_wput(q, mp)
 207     queue_t *q;
 208     mblk_t *mp;
 209 {
 210     if_ppp_t *sp;
 211     struct iocblk *iop;
 212     int error, unit;
 213     struct ifnet *ifp;
 214
 215     sp = (if_ppp_t *) q->q_ptr;
 216     switch (mp->b_datap->db_type) {
 217     case M_DATA:
 218         /*
 219          * Now why would we be getting data coming in here??
 220          */
 221         if (sp->flags & DBGLOG)
 222             printf("if_ppp: got M_DATA len=%d\n", msgdsize(mp));
 223         freemsg(mp);
 224         break;
 225
 226     case M_IOCTL:
 227         iop = (struct iocblk *) mp->b_rptr;
 228         error = EINVAL;
 229
 230         if (sp->flags & DBGLOG)
 231             printf("if_ppp: got ioctl cmd=%x count=%d\n",
 232                    iop->ioc_cmd, iop->ioc_count);
 233
 234         switch (iop->ioc_cmd) {
 235         case PPPIO_NEWPPA:              /* well almost */
 236             if (iop->ioc_count != sizeof(int) || sp->unit >= 0)
 237                 break;
 238             if ((error = NOTSUSER()) != 0)
 239                 break;
 240             unit = *(int *)mp->b_cont->b_rptr;
 241
 242             /* Check that this unit isn't already in use */
 243             if (unit < ppp_nalloc && states[unit] != 0) {
 244                 error = EADDRINUSE;
 245                 break;
 246             }
 247
 248             /* Extend ifs and states arrays if necessary. */
 249             error = ENOSR;
 250             if (unit >= ppp_nalloc) {
 251                 int newn;
 252                 struct ifnet **newifs;
 253                 if_ppp_t **newstates;
 254
 255                 newn = unit + 4;
 256                 if (sp->flags & DBGLOG)
 257                     printf("if_ppp: extending ifs to %d\n", newn);
 258                 newifs = (struct ifnet **)
 259                     ALLOC_NOSLEEP(newn * sizeof (struct ifnet *));
 260                 if (newifs == 0)
 261                     break;
 262                 bzero(newifs, newn * sizeof (struct ifnet *));
 263                 newstates = (if_ppp_t **)
 264                     ALLOC_NOSLEEP(newn * sizeof (struct if_ppp_t *));
 265                 if (newstates == 0) {
 266                     FREE(newifs, newn * sizeof (struct ifnet *));
 267                     break;
 268                 }
 269                 bzero(newstates, newn * sizeof (struct if_ppp_t *));
 270                 bcopy(ifs, newifs, ppp_nalloc * sizeof(struct ifnet *));
 271                 bcopy(states, newstates, ppp_nalloc * sizeof(if_ppp_t *));
 272                 if (ifs) {
 273                     FREE(ifs, ppp_nalloc * sizeof(struct ifnet *));
 274                     FREE(states, ppp_nalloc * sizeof(if_ppp_t *));
 275                 }
 276                 ifs = newifs;
 277                 states = newstates;
 278                 ppp_nalloc = newn;
 279             }
 280
 281             /* Allocate a new ifnet struct if necessary. */
 282             ifp = ifs[unit];
 283             if (ifp == 0) {
 284                 ifp = (struct ifnet *) ALLOC_NOSLEEP(sizeof (struct ifnet));
 285                 if (ifp == 0)
 286                     break;
 287                 bzero(ifp, sizeof (struct ifnet));
 288                 ifs[unit] = ifp;
 289                 ifp->if_name = "ppp";
 290                 ifp->if_unit = unit;
 291                 ifp->if_mtu = PPP_MTU;
 292                 ifp->if_flags = IFF_POINTOPOINT | IFF_RUNNING;
 293 #ifndef __osf__
 294 #ifdef IFF_MULTICAST
 295                 ifp->if_flags |= IFF_MULTICAST;
 296 #endif
 297 #endif /* __osf__ */
 298                 ifp->if_output = if_ppp_output;
 299 #ifdef __osf__
 300                 ifp->if_version = "Point-to-Point Protocol, version 2.3.11";
 301                 ifp->if_mediamtu = PPP_MTU;
 302                 ifp->if_type = IFT_PPP;
 303                 ifp->if_hdrlen = PPP_HDRLEN;
 304                 ifp->if_addrlen = 0;
 305                 ifp->if_flags |= IFF_NOARP | IFF_SIMPLEX | IFF_NOTRAILERS;
 306 #ifdef IFF_VAR_MTU
 307                 ifp->if_flags |= IFF_VAR_MTU;
 308 #endif
 309 #ifdef NETMASTERCPU
 310                 ifp->if_affinity = NETMASTERCPU;
 311 #endif
 312 #endif
 313                 ifp->if_ioctl = if_ppp_ioctl;
 314                 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 315                 if_attach(ifp);
 316                 if (sp->flags & DBGLOG)
 317                     printf("if_ppp: created unit %d\n", unit);
 318             } else {
 319                 ifp->if_mtu = PPP_MTU;
 320                 ifp->if_flags |= IFF_RUNNING;
 321             }
 322
 323             states[unit] = sp;
 324             sp->unit = unit;
 325
 326             error = 0;
 327             iop->ioc_count = 0;
 328             if (sp->flags & DBGLOG)
 329                 printf("if_ppp: attached unit %d, sp=%x q=%x\n", unit,
 330                        sp, sp->q);
 331             break;
 332
 333         case PPPIO_DEBUG:
 334             error = -1;
 335             if (iop->ioc_count == sizeof(int)) {
 336                 if (*(int *)mp->b_cont->b_rptr == PPPDBG_LOG + PPPDBG_IF) {
 337                     printf("if_ppp: debug log enabled, q=%x sp=%x\n", q, sp);
 338                     sp->flags |= DBGLOG;
 339                     error = 0;
 340                     iop->ioc_count = 0;
 341                 }
 342             }
 343             break;
 344
 345         default:
 346             error = -1;
 347             break;
 348         }
 349
 350         if (sp->flags & DBGLOG)
 351             printf("if_ppp: ioctl result %d\n", error);
 352         if (error < 0)
 353             putnext(q, mp);
 354         else if (error == 0) {
 355             mp->b_datap->db_type = M_IOCACK;
 356             qreply(q, mp);
 357         } else {
 358             mp->b_datap->db_type = M_IOCNAK;
 359             iop->ioc_count = 0;
 360             iop->ioc_error = error;
 361             qreply(q, mp);
 362         }
 363         break;
 364
 365     default:
 366         putnext(q, mp);
 367     }
 368     return 0;
 369 }
 370
 371 static int
 372 if_ppp_rput(q, mp)
 373     queue_t *q;
 374     mblk_t *mp;
 375 {
 376     if_ppp_t *sp;
 377     int proto, s;
 378     struct mbuf *mb;
 379     struct ifqueue *inq;
 380     struct ifnet *ifp;
 381     int len;
 382
 383     sp = (if_ppp_t *) q->q_ptr;
 384     switch (mp->b_datap->db_type) {
 385     case M_DATA:
 386         /*
 387          * Convert the message into an mbuf chain
 388          * and inject it into the network code.
 389          */
 390         if (sp->flags & DBGLOG)
 391             printf("if_ppp: rput pkt len %d data %x %x %x %x %x %x %x %x\n",
 392                    msgdsize(mp), mp->b_rptr[0], mp->b_rptr[1], mp->b_rptr[2],
 393                    mp->b_rptr[3], mp->b_rptr[4], mp->b_rptr[5], mp->b_rptr[6],
 394                    mp->b_rptr[7]);
 395
 396         if (sp->unit < 0) {
 397             freemsg(mp);
 398             break;
 399         }
 400         if (sp->unit >= ppp_nalloc || (ifp = ifs[sp->unit]) == 0) {
 401 #ifdef DEBUG
 402             printf("if_ppp: no unit %d!\n", sp->unit);
 403 #endif
 404             freemsg(mp);
 405             break;
 406         }
 407
 408         if ((ifp->if_flags & IFF_UP) == 0) {
 409             freemsg(mp);
 410             break;
 411         }
 412         ++ifp->if_ipackets;
 413
 414         proto = PPP_PROTOCOL(mp->b_rptr);
 415         adjmsg(mp, PPP_HDRLEN);
 416         len = msgdsize(mp);
 417         mb = make_mbufs(mp, sizeof(struct ifnet *));
 418         freemsg(mp);
 419         if (mb == NULL) {
 420             if (sp->flags & DBGLOG)
 421                 printf("if_ppp%d: make_mbufs failed\n", ifp->if_unit);
 422             ++ifp->if_ierrors;
 423             break;
 424         }
 425
 426 #ifdef SNIT_SUPPORT
 427         if (proto == PPP_IP && (ifp->if_flags & IFF_PROMISC)) {
 428             struct nit_if nif;
 429
 430             nif.nif_header = (caddr_t) &snit_ehdr;
 431             nif.nif_hdrlen = sizeof(snit_ehdr);
 432             nif.nif_bodylen = len;
 433             nif.nif_promisc = 0;
 434             snit_intr(ifp, mb, &nif);
 435         }
 436 #endif
 437
 438 /*
 439  * For Digital UNIX, there's space set aside in the header mbuf
 440  * for the interface info.
 441  *
 442  * For Sun it's smuggled around via a pointer at the front of the mbuf.
 443  */
 444 #ifdef __osf__
 445         mb->m_pkthdr.rcvif = ifp;
 446         mb->m_pkthdr.len = len;
 447 #else
 448         mb->m_off -= sizeof(struct ifnet *);
 449         mb->m_len += sizeof(struct ifnet *);
 450         *mtod(mb, struct ifnet **) = ifp;
 451 #endif
 452
 453         inq = 0;
 454         switch (proto) {
 455         case PPP_IP:
 456             inq = &ipintrq;
 457             schednetisr(NETISR_IP);
 458         }
 459
 460         if (inq != 0) {
 461             s = splhigh();
 462             if (IF_QFULL(inq)) {
 463                 IF_DROP(inq);
 464                 ++ifp->if_ierrors;
 465                 if (sp->flags & DBGLOG)
 466                     printf("if_ppp: inq full, proto=%x\n", proto);
 467                 m_freem(mb);
 468             } else {
 469                 IF_ENQUEUE(inq, mb);
 470             }
 471             splx(s);
 472         } else {
 473             if (sp->flags & DBGLOG)
 474                 printf("if_ppp%d: proto=%x?\n", ifp->if_unit, proto);
 475             ++ifp->if_ierrors;
 476             m_freem(mb);
 477         }
 478         break;
 479
 480     default:
 481         putnext(q, mp);
 482     }
 483     return 0;
 484 }
 485
 486 /*
 487  * Network code wants to output a packet.
 488  * Turn it into a STREAMS message and send it down.
 489  */
 490 static int
 491 if_ppp_output(ifp, m0, dst)
 492     struct ifnet *ifp;
 493     struct mbuf *m0;
 494     struct sockaddr *dst;
 495 {
 496     mblk_t *mp;
 497     int proto, s;
 498     if_ppp_t *sp;
 499     u_char *p;
 500
 501     if ((ifp->if_flags & IFF_UP) == 0) {
 502         m_freem(m0);
 503         return ENETDOWN;
 504     }
 505
 506     if ((unsigned)ifp->if_unit >= ppp_nalloc) {
 507 #ifdef DEBUG
 508         printf("if_ppp_output: unit %d?\n", ifp->if_unit);
 509 #endif
 510         m_freem(m0);
 511         return EINVAL;
 512     }
 513     sp = states[ifp->if_unit];
 514     if (sp == 0) {
 515 #ifdef DEBUG
 516         printf("if_ppp_output: no queue?\n");
 517 #endif
 518         m_freem(m0);
 519         return ENETDOWN;
 520     }
 521
 522     if (sp->flags & DBGLOG) {
 523         p = mtod(m0, u_char *);
 524         printf("if_ppp_output%d: af=%d data=%x %x %x %x %x %x %x %x q=%x\n",
 525                ifp->if_unit, dst->sa_family, p[0], p[1], p[2], p[3], p[4],
 526                p[5], p[6], p[7], sp->q);
 527     }
 528
 529     switch (dst->sa_family) {
 530     case AF_INET:
 531         proto = PPP_IP;
 532 #ifdef SNIT_SUPPORT
 533         if (ifp->if_flags & IFF_PROMISC) {
 534             struct nit_if nif;
 535             struct mbuf *m;
 536             int len;
 537
 538             for (len = 0, m = m0; m != NULL; m = m->m_next)
 539                 len += m->m_len;
 540             nif.nif_header = (caddr_t) &snit_ehdr;
 541             nif.nif_hdrlen = sizeof(snit_ehdr);
 542             nif.nif_bodylen = len;
 543             nif.nif_promisc = 0;
 544             snit_intr(ifp, m0, &nif);
 545         }
 546 #endif
 547         break;
 548
 549     default:
 550         m_freem(m0);
 551         return EAFNOSUPPORT;
 552     }
 553
 554     ++ifp->if_opackets;
 555     mp = make_message(m0, PPP_HDRLEN);
 556     m_freem(m0);
 557     if (mp == 0) {
 558         ++ifp->if_oerrors;
 559         return ENOBUFS;
 560     }
 561     mp->b_rptr -= PPP_HDRLEN;
 562     mp->b_rptr[0] = PPP_ALLSTATIONS;
 563     mp->b_rptr[1] = PPP_UI;
 564     mp->b_rptr[2] = proto >> 8;
 565     mp->b_rptr[3] = proto;
 566
 567     s = splstr();
 568     if (sp->flags & DBGLOG)
 569         printf("if_ppp: putnext(%x, %x), r=%x w=%x p=%x\n",
 570                sp->q, mp, mp->b_rptr, mp->b_wptr, proto);
 571     putnext(sp->q, mp);
 572     splx(s);
 573
 574     return 0;
 575 }
 576
 577 /*
 578  * Socket ioctl routine for ppp interfaces.
 579  */
 580 static int
 581 if_ppp_ioctl(ifp, cmd, data)
 582     struct ifnet *ifp;
 583     u_int cmd;
 584     caddr_t data;
 585 {
 586     int s, error;
 587     struct ifreq *ifr = (struct ifreq *) data;
 588     struct ifaddr *ifa = (struct ifaddr *) data;
 589     u_short mtu;
 590
 591     error = 0;
 592     s = splimp();
 593     switch (cmd) {
 594     case SIOCSIFFLAGS:
 595         if ((ifp->if_flags & IFF_RUNNING) == 0)
 596             ifp->if_flags &= ~IFF_UP;
 597         break;
 598
 599     case SIOCSIFADDR:
 600         if (IFA_ADDR(ifa).sa_family != AF_INET)
 601             error = EAFNOSUPPORT;
 602         break;
 603
 604     case SIOCSIFDSTADDR:
 605         if (IFA_ADDR(ifa).sa_family != AF_INET)
 606             error = EAFNOSUPPORT;
 607         break;
 608
 609     case SIOCSIFMTU:
 610         if ((error = NOTSUSER()) != 0)
 611             break;
 612 #ifdef __osf__
 613         /* this hack is necessary because ifioctl checks ifr_data
 614          * in 4.0 and 5.0, but ifr_data and ifr_metric overlay each
 615          * other in the definition of struct ifreq so pppd can't set both.
 616          */
 617         bcopy(ifr->ifr_data, &mtu, sizeof (u_short));
 618         ifr->ifr_mtu = mtu;
 619 #endif
 620
 621         if (ifr->ifr_mtu < PPP_MINMTU || ifr->ifr_mtu > PPP_MAXMTU) {
 622             error = EINVAL;
 623             break;
 624         }
 625         ifp->if_mtu = ifr->ifr_mtu;
 626         break;
 627
 628     case SIOCGIFMTU:
 629         ifr->ifr_mtu = ifp->if_mtu;
 630         break;
 631
 632     case SIOCADDMULTI:
 633     case SIOCDELMULTI:
 634         switch(ifr->ifr_addr.sa_family) {
 635         case AF_INET:
 636             break;
 637         default:
 638             error = EAFNOSUPPORT;
 639             break;
 640         }
 641         break;
 642
 643     default:
 644         error = EINVAL;
 645     }
 646     splx(s);
 647     return (error);
 648 }
 649
 650 /*
 651  * Turn a STREAMS message into an mbuf chain.
 652  */
 653 static struct mbuf *
 654 make_mbufs(mp, off)
 655     mblk_t *mp;
 656     int off;
 657 {
 658     struct mbuf *head, **prevp, *m;
 659     int len, space, n;
 660     unsigned char *cp, *dp;
 661
 662     len = msgdsize(mp);
 663     if (len == 0)
 664         return 0;
 665     prevp = &head;
 666     space = 0;
 667     cp = mp->b_rptr;
 668 #ifdef __osf__
 669     MGETHDR(m, M_DONTWAIT, MT_DATA);
 670     m->m_len = 0;
 671     space = MHLEN;
 672     *prevp = m;
 673     prevp = &m->m_next;
 674     dp = mtod(m, unsigned char *);
 675     len -= space;
 676     off = 0;
 677 #endif
 678     for (;;) {
 679         while (cp >= mp->b_wptr) {
 680             mp = mp->b_cont;
 681             if (mp == 0) {
 682                 *prevp = 0;
 683                 return head;
 684             }
 685             cp = mp->b_rptr;
 686         }
 687         n = mp->b_wptr - cp;
 688         if (space == 0) {
 689             MGET(m, M_DONTWAIT, MT_DATA);
 690             *prevp = m;
 691             if (m == 0) {
 692                 if (head != 0)
 693                     m_freem(head);
 694                 return 0;
 695             }
 696             if (len + off > 2 * MLEN) {
 697 #ifdef __osf__
 698                 MCLGET(m, M_DONTWAIT);
 699 #else
 700                 MCLGET(m);
 701 #endif
 702             }
 703 #ifdef __osf__
 704             space = ((m->m_flags & M_EXT) ? MCLBYTES : MLEN);
 705 #else
 706             space = (m->m_off > MMAXOFF? MCLBYTES: MLEN) - off;
 707             m->m_off += off;
 708 #endif
 709             m->m_len = 0;
 710             len -= space;
 711             dp = mtod(m, unsigned char *);
 712             off = 0;
 713             prevp = &m->m_next;
 714         }
 715         if (n > space)
 716             n = space;
 717         bcopy(cp, dp, n);
 718         cp += n;
 719         dp += n;
 720         space -= n;
 721         m->m_len += n;
 722     }
 723 }
 724
 725 /*
 726  * Turn an mbuf chain into a STREAMS message.
 727  */
 728 #define ALLOCB_MAX      4096
 729
 730 static mblk_t *
 731 make_message(m, off)
 732     struct mbuf *m;
 733     int off;
 734 {
 735     mblk_t *head, **prevp, *mp;
 736     int len, space, n, nb;
 737     unsigned char *cp, *dp;
 738     struct mbuf *nm;
 739
 740     len = 0;
 741     for (nm = m; nm != 0; nm = nm->m_next)
 742         len += nm->m_len;
 743     prevp = &head;
 744     space = 0;
 745     cp = mtod(m, unsigned char *);
 746     nb = m->m_len;
 747     for (;;) {
 748         while (nb <= 0) {
 749             m = m->m_next;
 750             if (m == 0) {
 751                 *prevp = 0;
 752                 return head;
 753             }
 754             cp = mtod(m, unsigned char *);
 755             nb = m->m_len;
 756         }
 757         if (space == 0) {
 758             space = len + off;
 759             if (space > ALLOCB_MAX)
 760                 space = ALLOCB_MAX;
 761             mp = allocb(space, BPRI_LO);
 762             *prevp = mp;
 763             if (mp == 0) {
 764                 if (head != 0)
 765                     freemsg(head);
 766                 return 0;
 767             }
 768             dp = mp->b_rptr += off;
 769             space -= off;
 770             len -= space;
 771             off = 0;
 772             prevp = &mp->b_cont;
 773         }
 774         n = nb < space? nb: space;
 775         bcopy(cp, dp, n);
 776         cp += n;
 777         dp += n;
 778         nb -= n;
 779         space -= n;
 780         mp->b_wptr = dp;
 781     }
 782 }
 783
 784 /*
 785  * Digital UNIX doesn't allow for removing ifnet structures
 786  * from the list.  But then we're not using this as a loadable
 787  * module anyway, so that's OK.
 788  *
 789  * Under SunOS, this should allow the module to be unloaded.
 790  * Unfortunately, it doesn't seem to detach all the references,
 791  * so your system may well crash after you unload this module :-(
 792  */
 793 #ifndef __osf__
 794
 795 /*
 796  * Remove an interface from the system.
 797  * This routine contains magic.
 798  */
 799 #include <net/route.h>
 800 #include <netinet/in_pcb.h>
 801 #include <netinet/ip_var.h>
 802 #include <netinet/tcp.h>
 803 #include <netinet/tcp_timer.h>
 804 #include <netinet/tcp_var.h>
 805 #include <netinet/udp.h>
 806 #include <netinet/udp_var.h>
 807
 808 static void
 809 ppp_if_detach(ifp)
 810     struct ifnet *ifp;
 811 {
 812     int s;
 813     struct inpcb *pcb;
 814     struct ifaddr *ifa;
 815     struct in_ifaddr **inap;
 816     struct ifnet **ifpp;
 817
 818     s = splhigh();
 819
 820     /*
 821      * Clear the interface from any routes currently cached in
 822      * TCP or UDP protocol control blocks.
 823      */
 824     for (pcb = tcb.inp_next; pcb != &tcb; pcb = pcb->inp_next)
 825         if (pcb->inp_route.ro_rt && pcb->inp_route.ro_rt->rt_ifp == ifp)
 826             in_losing(pcb);
 827     for (pcb = udb.inp_next; pcb != &udb; pcb = pcb->inp_next)
 828         if (pcb->inp_route.ro_rt && pcb->inp_route.ro_rt->rt_ifp == ifp)
 829             in_losing(pcb);
 830
 831     /*
 832      * Delete routes through all addresses of the interface.
 833      */
 834     for (ifa = ifp->if_addrlist; ifa != 0; ifa = ifa->ifa_next) {
 835         rtinit(ifa, ifa, SIOCDELRT, RTF_HOST);
 836         rtinit(ifa, ifa, SIOCDELRT, 0);
 837     }
 838
 839     /*
 840      * Unlink the interface's address(es) from the in_ifaddr list.
 841      */
 842     for (inap = &in_ifaddr; *inap != 0; ) {
 843         if ((*inap)->ia_ifa.ifa_ifp == ifp)
 844             *inap = (*inap)->ia_next;
 845         else
 846             inap = &(*inap)->ia_next;
 847     }
 848
 849     /*
 850      * Delete the interface from the ifnet list.
 851      */
 852     for (ifpp = &ifnet; (*ifpp) != 0; ) {
 853         if (*ifpp == ifp)
 854             break;
 855         ifpp = &(*ifpp)->if_next;
 856     }
 857     if (*ifpp == 0)
 858         printf("couldn't find interface ppp%d in ifnet list\n", ifp->if_unit);
 859     else
 860         *ifpp = ifp->if_next;
 861
 862     splx(s);
 863 }
 864
 865 #endif /* __osf__ */