usr.sbin/ppp/mp.c

   1 /*-
   2  * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/param.h>
  30 #include <netinet/in.h>
  31 #include <netinet/in_systm.h>
  32 #include <netinet/ip.h>
  33 #include <arpa/inet.h>
  34 #include <net/if_dl.h>
  35 #include <sys/socket.h>
  36 #include <sys/un.h>
  37
  38 #include <errno.h>
  39 #include <paths.h>
  40 #include <stdarg.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <sys/stat.h>
  45 #include <termios.h>
  46 #include <unistd.h>
  47
  48 #include "layer.h"
  49 #ifndef NONAT
  50 #include "nat_cmd.h"
  51 #endif
  52 #include "vjcomp.h"
  53 #include "ua.h"
  54 #include "defs.h"
  55 #include "command.h"
  56 #include "mbuf.h"
  57 #include "log.h"
  58 #include "timer.h"
  59 #include "fsm.h"
  60 #include "iplist.h"
  61 #include "throughput.h"
  62 #include "slcompress.h"
  63 #include "lqr.h"
  64 #include "hdlc.h"
  65 #include "ncpaddr.h"
  66 #include "ipcp.h"
  67 #include "auth.h"
  68 #include "lcp.h"
  69 #include "async.h"
  70 #include "ccp.h"
  71 #include "link.h"
  72 #include "descriptor.h"
  73 #include "physical.h"
  74 #include "chat.h"
  75 #include "proto.h"
  76 #include "filter.h"
  77 #include "mp.h"
  78 #include "chap.h"
  79 #include "cbcp.h"
  80 #include "datalink.h"
  81 #ifndef NORADIUS
  82 #include "radius.h"
  83 #endif
  84 #include "ipv6cp.h"
  85 #include "ncp.h"
  86 #include "bundle.h"
  87 #include "prompt.h"
  88 #include "id.h"
  89 #include "arp.h"
  90
  91 void
  92 peerid_Init(struct peerid *peer)
  93 {
  94   peer->enddisc.class = 0;
  95   *peer->enddisc.address = '\0';
  96   peer->enddisc.len = 0;
  97   *peer->authname = '\0';
  98 }
  99
 100 int
 101 peerid_Equal(const struct peerid *p1, const struct peerid *p2)
 102 {
 103   return !strcmp(p1->authname, p2->authname) &&
 104          p1->enddisc.class == p2->enddisc.class &&
 105          p1->enddisc.len == p2->enddisc.len &&
 106          !memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len);
 107 }
 108
 109 static u_int32_t
 110 inc_seq(unsigned is12bit, u_int32_t seq)
 111 {
 112   seq++;
 113   if (is12bit) {
 114     if (seq & 0xfffff000)
 115       seq = 0;
 116   } else if (seq & 0xff000000)
 117     seq = 0;
 118   return seq;
 119 }
 120
 121 static int
 122 isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2)
 123 {
 124   u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200;
 125
 126   if (seq1 > max) {
 127     if (seq2 < 0x200 || seq2 > seq1)
 128       return 1;
 129   } else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2)
 130     return 1;
 131
 132   return 0;
 133 }
 134
 135 static int
 136 mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
 137 {
 138   if (mp->local_is12bit) {
 139     u_int16_t val;
 140
 141     ua_ntohs(MBUF_CTOP(m), &val);
 142     if (val & 0x3000) {
 143       log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
 144       return 0;
 145     }
 146     header->begin = val & 0x8000 ? 1 : 0;
 147     header->end = val & 0x4000 ? 1 : 0;
 148     header->seq = val & 0x0fff;
 149     return 2;
 150   } else {
 151     ua_ntohl(MBUF_CTOP(m), &header->seq);
 152     if (header->seq & 0x3f000000) {
 153       log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
 154       return 0;
 155     }
 156     header->begin = header->seq & 0x80000000 ? 1 : 0;
 157     header->end = header->seq & 0x40000000 ? 1 : 0;
 158     header->seq &= 0x00ffffff;
 159     return 4;
 160   }
 161 }
 162
 163 static void
 164 mp_LayerStart(void *v __unused, struct fsm *fp __unused)
 165 {
 166   /* The given FSM (ccp) is about to start up ! */
 167 }
 168
 169 static void
 170 mp_LayerUp(void *v __unused, struct fsm *fp)
 171 {
 172   /* The given fsm (ccp) is now up */
 173
 174   bundle_CalculateBandwidth(fp->bundle);        /* Against ccp_MTUOverhead */
 175 }
 176
 177 static void
 178 mp_LayerDown(void *v __unused, struct fsm *fp __unused)
 179 {
 180   /* The given FSM (ccp) has been told to come down */
 181 }
 182
 183 static void
 184 mp_LayerFinish(void *v __unused, struct fsm *fp)
 185 {
 186   /* The given fsm (ccp) is now down */
 187   if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
 188     fsm_Open(fp);               /* CCP goes to ST_STOPPED */
 189 }
 190
 191 static void
 192 mp_UpDown(void *v)
 193 {
 194   struct mp *mp = (struct mp *)v;
 195   int percent;
 196
 197   percent = MAX(mp->link.stats.total.in.OctetsPerSecond,
 198                 mp->link.stats.total.out.OctetsPerSecond) * 800 /
 199             mp->bundle->bandwidth;
 200   if (percent >= mp->cfg.autoload.max) {
 201     log_Printf(LogDEBUG, "%d%% saturation - bring a link up ?\n", percent);
 202     bundle_AutoAdjust(mp->bundle, percent, AUTO_UP);
 203   } else if (percent <= mp->cfg.autoload.min) {
 204     log_Printf(LogDEBUG, "%d%% saturation - bring a link down ?\n", percent);
 205     bundle_AutoAdjust(mp->bundle, percent, AUTO_DOWN);
 206   }
 207 }
 208
 209 void
 210 mp_StopAutoloadTimer(struct mp *mp)
 211 {
 212   throughput_stop(&mp->link.stats.total);
 213 }
 214
 215 void
 216 mp_CheckAutoloadTimer(struct mp *mp)
 217 {
 218   if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) {
 219     throughput_destroy(&mp->link.stats.total);
 220     throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
 221     throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
 222   }
 223
 224   if (bundle_WantAutoloadTimer(mp->bundle))
 225     throughput_start(&mp->link.stats.total, "MP throughput", 1);
 226   else
 227     mp_StopAutoloadTimer(mp);
 228 }
 229
 230 void
 231 mp_RestartAutoloadTimer(struct mp *mp)
 232 {
 233   if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period)
 234     mp_CheckAutoloadTimer(mp);
 235   else
 236     throughput_clear(&mp->link.stats.total, THROUGHPUT_OVERALL, NULL);
 237 }
 238
 239 void
 240 mp_Init(struct mp *mp, struct bundle *bundle)
 241 {
 242   mp->peer_is12bit = mp->local_is12bit = 0;
 243   mp->peer_mrru = mp->local_mrru = 0;
 244
 245   peerid_Init(&mp->peer);
 246
 247   mp->out.seq = 0;
 248   mp->out.link = 0;
 249   mp->out.af = AF_INET;
 250   mp->seq.min_in = 0;
 251   mp->seq.next_in = 0;
 252   mp->inbufs = NULL;
 253   mp->bundle = bundle;
 254
 255   mp->link.type = LOGICAL_LINK;
 256   mp->link.name = "mp";
 257   mp->link.len = sizeof *mp;
 258
 259   mp->cfg.autoload.period = SAMPLE_PERIOD;
 260   mp->cfg.autoload.min = mp->cfg.autoload.max = 0;
 261   throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
 262   throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
 263   mp->link.stats.parent = NULL;
 264   mp->link.stats.gather = 0;    /* Let the physical links gather stats */
 265   memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
 266   memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
 267   memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
 268
 269   mp->fsmp.LayerStart = mp_LayerStart;
 270   mp->fsmp.LayerUp = mp_LayerUp;
 271   mp->fsmp.LayerDown = mp_LayerDown;
 272   mp->fsmp.LayerFinish = mp_LayerFinish;
 273   mp->fsmp.object = mp;
 274
 275   mpserver_Init(&mp->server);
 276
 277   mp->cfg.mrru = 0;
 278   mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED;
 279   mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED;
 280   mp->cfg.enddisc.class = 0;
 281   *mp->cfg.enddisc.address = '\0';
 282   mp->cfg.enddisc.len = 0;
 283
 284   lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL);
 285   ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp);
 286
 287   link_EmptyStack(&mp->link);
 288   link_Stack(&mp->link, &protolayer);
 289   link_Stack(&mp->link, &ccplayer);
 290   link_Stack(&mp->link, &vjlayer);
 291 #ifndef NONAT
 292   link_Stack(&mp->link, &natlayer);
 293 #endif
 294 }
 295
 296 int
 297 mp_Up(struct mp *mp, struct datalink *dl)
 298 {
 299   struct lcp *lcp = &dl->physical->link.lcp;
 300
 301   if (mp->active) {
 302     /* We're adding a link - do a last validation on our parameters */
 303     if (!peerid_Equal(&dl->peer, &mp->peer)) {
 304       log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name);
 305       log_Printf(LogPHASE, "  Attached to peer %s/%s\n", mp->peer.authname,
 306                  mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
 307                             mp->peer.enddisc.len));
 308       log_Printf(LogPHASE, "  New link is peer %s/%s\n", dl->peer.authname,
 309                  mp_Enddisc(dl->peer.enddisc.class, dl->peer.enddisc.address,
 310                             dl->peer.enddisc.len));
 311       return MP_FAILED;
 312     }
 313     if (mp->local_mrru != lcp->want_mrru ||
 314         mp->peer_mrru != lcp->his_mrru ||
 315         mp->local_is12bit != lcp->want_shortseq ||
 316         mp->peer_is12bit != lcp->his_shortseq) {
 317       log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n",
 318                 dl->name);
 319       return MP_FAILED;
 320     }
 321     return MP_ADDED;
 322   } else {
 323     /* First link in multilink mode */
 324
 325     mp->local_mrru = lcp->want_mrru;
 326     mp->peer_mrru = lcp->his_mrru;
 327     mp->local_is12bit = lcp->want_shortseq;
 328     mp->peer_is12bit = lcp->his_shortseq;
 329     mp->peer = dl->peer;
 330
 331     throughput_destroy(&mp->link.stats.total);
 332     throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
 333     throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
 334     memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
 335     memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
 336     memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
 337
 338     /* Tell the link who it belongs to */
 339     dl->physical->link.stats.parent = &mp->link.stats.total;
 340
 341     mp->out.seq = 0;
 342     mp->out.link = 0;
 343     mp->out.af = AF_INET;
 344     mp->seq.min_in = 0;
 345     mp->seq.next_in = 0;
 346
 347     /*
 348      * Now we create our server socket.
 349      * If it already exists, join it.  Otherwise, create and own it
 350      */
 351     switch (mpserver_Open(&mp->server, &mp->peer)) {
 352     case MPSERVER_CONNECTED:
 353       log_Printf(LogPHASE, "mp: Transfer link on %s\n",
 354                 mp->server.socket.sun_path);
 355       mp->server.send.dl = dl;          /* Defer 'till it's safe to send */
 356       return MP_LINKSENT;
 357     case MPSERVER_FAILED:
 358       return MP_FAILED;
 359     case MPSERVER_LISTENING:
 360       log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path);
 361       log_Printf(LogPHASE, "    First link: %s\n", dl->name);
 362
 363       /* Re-point our NCP layers at our MP link */
 364       ncp_SetLink(&mp->bundle->ncp, &mp->link);
 365
 366       /* Our lcp's already up 'cos of the NULL parent */
 367       if (ccp_SetOpenMode(&mp->link.ccp)) {
 368         fsm_Up(&mp->link.ccp.fsm);
 369         fsm_Open(&mp->link.ccp.fsm);
 370       }
 371
 372       mp->active = 1;
 373       break;
 374     }
 375   }
 376
 377   return MP_UP;
 378 }
 379
 380 void
 381 mp_Down(struct mp *mp)
 382 {
 383   if (mp->active) {
 384     struct mbuf *next;
 385
 386     /* Stop that ! */
 387     mp_StopAutoloadTimer(mp);
 388
 389     /* Don't want any more of these */
 390     mpserver_Close(&mp->server);
 391
 392     /* CCP goes down with a bang */
 393     fsm2initial(&mp->link.ccp.fsm);
 394
 395     /* Received fragments go in the bit-bucket */
 396     while (mp->inbufs) {
 397       next = mp->inbufs->m_nextpkt;
 398       m_freem(mp->inbufs);
 399       mp->inbufs = next;
 400     }
 401
 402     peerid_Init(&mp->peer);
 403     mp->active = 0;
 404   }
 405 }
 406
 407 void
 408 mp_linkInit(struct mp_link *mplink)
 409 {
 410   mplink->seq = 0;
 411   mplink->bandwidth = 0;
 412 }
 413
 414 static void
 415 mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p)
 416 {
 417   struct mp_header mh, h;
 418   struct mbuf *q, *last;
 419   u_int32_t seq;
 420
 421   /*
 422    * When `m' and `p' are NULL, it means our oldest link has gone down.
 423    * We want to determine a new min, and process any intermediate stuff
 424    * as normal
 425    */
 426
 427   if (m && mp_ReadHeader(mp, m, &mh) == 0) {
 428     m_freem(m);
 429     return;
 430   }
 431
 432   if (p) {
 433     seq = p->dl->mp.seq;
 434     p->dl->mp.seq = mh.seq;
 435   } else
 436     seq = mp->seq.min_in;
 437
 438   if (mp->seq.min_in == seq) {
 439     /*
 440      * We've received new data on the link that has our min (oldest) seq.
 441      * Figure out which link now has the smallest (oldest) seq.
 442      */
 443     struct datalink *dl;
 444
 445     mp->seq.min_in = (u_int32_t)-1;
 446     for (dl = mp->bundle->links; dl; dl = dl->next)
 447       if (dl->state == DATALINK_OPEN &&
 448           (mp->seq.min_in == (u_int32_t)-1 ||
 449            isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in)))
 450         mp->seq.min_in = dl->mp.seq;
 451   }
 452
 453   /*
 454    * Now process as many of our fragments as we can, adding our new
 455    * fragment in as we go, and ordering with the oldest at the top of
 456    * the queue.
 457    */
 458
 459   last = NULL;
 460   seq = mp->seq.next_in;
 461   q = mp->inbufs;
 462   while (q || m) {
 463     if (!q) {
 464       if (last)
 465         last->m_nextpkt = m;
 466       else
 467         mp->inbufs = m;
 468       q = m;
 469       m = NULL;
 470       h = mh;
 471     } else {
 472       mp_ReadHeader(mp, q, &h);
 473
 474       if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) {
 475         /* Our received fragment fits in before this one, so link it in */
 476         if (last)
 477           last->m_nextpkt = m;
 478         else
 479           mp->inbufs = m;
 480         m->m_nextpkt = q;
 481         q = m;
 482         h = mh;
 483         m = NULL;
 484       }
 485     }
 486
 487     if (h.seq != seq) {
 488       /* we're missing something :-( */
 489       if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) {
 490         /* we're never gonna get it */
 491         struct mbuf *next;
 492
 493         /* Zap all older fragments */
 494         while (mp->inbufs != q) {
 495           log_Printf(LogDEBUG, "Drop frag\n");
 496           next = mp->inbufs->m_nextpkt;
 497           m_freem(mp->inbufs);
 498           mp->inbufs = next;
 499         }
 500
 501         /*
 502          * Zap everything until the next `end' fragment OR just before
 503          * the next `begin' fragment OR 'till seq.min_in - whichever
 504          * comes first.
 505          */
 506         do {
 507           mp_ReadHeader(mp, mp->inbufs, &h);
 508           if (h.begin) {
 509             /* We might be able to process this ! */
 510             h.seq--;  /* We're gonna look for fragment with h.seq+1 */
 511             break;
 512           }
 513           next = mp->inbufs->m_nextpkt;
 514           log_Printf(LogDEBUG, "Drop frag %u\n", h.seq);
 515           m_freem(mp->inbufs);
 516           mp->inbufs = next;
 517         } while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in,
 518                                          h.seq) || h.end));
 519
 520         /*
 521          * Continue processing things from here.
 522          * This deals with the possibility that we received a fragment
 523          * on the slowest link that invalidates some of our data (because
 524          * of the hole at `q'), but where there are subsequent `whole'
 525          * packets that have already been received.
 526          */
 527
 528         mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
 529         last = NULL;
 530         q = mp->inbufs;
 531       } else
 532         /* we may still receive the missing fragment */
 533         break;
 534     } else if (h.end) {
 535       /* We've got something, reassemble */
 536       struct mbuf **frag = &q;
 537       int len;
 538       long long first = -1;
 539
 540       do {
 541         *frag = mp->inbufs;
 542         mp->inbufs = mp->inbufs->m_nextpkt;
 543         len = mp_ReadHeader(mp, *frag, &h);
 544         if (first == -1)
 545           first = h.seq;
 546         if (frag == &q && !h.begin) {
 547           log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n",
 548                     (u_long)h.seq);
 549           m_freem(q);
 550           q = NULL;
 551         } else if (frag != &q && h.begin) {
 552           log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n",
 553                     (u_long)h.seq - 1);
 554           /*
 555            * Stuff our fragment back at the front of the queue and zap
 556            * our half-assembled packet.
 557            */
 558           (*frag)->m_nextpkt = mp->inbufs;
 559           mp->inbufs = *frag;
 560           *frag = NULL;
 561           m_freem(q);
 562           q = NULL;
 563           frag = &q;
 564           h.end = 0;    /* just in case it's a whole packet */
 565         } else {
 566           (*frag)->m_offset += len;
 567           (*frag)->m_len -= len;
 568           (*frag)->m_nextpkt = NULL;
 569           do
 570             frag = &(*frag)->m_next;
 571           while (*frag != NULL);
 572         }
 573       } while (!h.end);
 574
 575       if (q) {
 576         q = m_pullup(q);
 577         log_Printf(LogDEBUG, "MP: Reassembled frags %lu-%lu, length %zd\n",
 578                    (u_long)first, (u_long)h.seq, m_length(q));
 579         link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle);
 580         m_freem(q);
 581       }
 582
 583       mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
 584       last = NULL;
 585       q = mp->inbufs;
 586     } else {
 587       /* Look for the next fragment */
 588       seq = inc_seq(mp->local_is12bit, seq);
 589       last = q;
 590       q = q->m_nextpkt;
 591     }
 592   }
 593
 594   if (m) {
 595     /* We still have to find a home for our new fragment */
 596     last = NULL;
 597     for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) {
 598       mp_ReadHeader(mp, q, &h);
 599       if (isbefore(mp->local_is12bit, mh.seq, h.seq))
 600         break;
 601     }
 602     /* Our received fragment fits in here */
 603     if (last)
 604       last->m_nextpkt = m;
 605     else
 606       mp->inbufs = m;
 607     m->m_nextpkt = q;
 608   }
 609 }
 610
 611 struct mbuf *
 612 mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
 613 {
 614   struct physical *p = link2physical(l);
 615
 616   if (!bundle->ncp.mp.active)
 617     /* Let someone else deal with it ! */
 618     return bp;
 619
 620   if (p == NULL) {
 621     log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n");
 622     m_freem(bp);
 623   } else {
 624     m_settype(bp, MB_MPIN);
 625     mp_Assemble(&bundle->ncp.mp, bp, p);
 626   }
 627
 628   return NULL;
 629 }
 630
 631 static void
 632 mp_Output(struct mp *mp, struct bundle *bundle, struct link *l,
 633           struct mbuf *m, u_int32_t begin, u_int32_t end)
 634 {
 635   char prepend[4];
 636
 637   /* Stuff an MP header on the front of our packet and send it */
 638
 639   if (mp->peer_is12bit) {
 640     u_int16_t val;
 641
 642     val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq;
 643     ua_htons(&val, prepend);
 644     m = m_prepend(m, prepend, 2, 0);
 645   } else {
 646     u_int32_t val;
 647
 648     val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq;
 649     ua_htonl(&val, prepend);
 650     m = m_prepend(m, prepend, 4, 0);
 651   }
 652   if (log_IsKept(LogDEBUG))
 653     log_Printf(LogDEBUG, "MP[frag %d]: Send %zd bytes on link `%s'\n",
 654                mp->out.seq, m_length(m), l->name);
 655   mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq);
 656
 657   if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
 658     log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
 659     return;
 660   }
 661
 662   link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP);
 663 }
 664
 665 int
 666 mp_FillPhysicalQueues(struct bundle *bundle)
 667 {
 668   struct mp *mp = &bundle->ncp.mp;
 669   struct datalink *dl, *fdl;
 670   size_t total, add, len;
 671   int thislink, nlinks, nopenlinks, sendasip;
 672   u_int32_t begin, end;
 673   struct mbuf *m, *mo;
 674   struct link *bestlink;
 675
 676   thislink = nlinks = nopenlinks = 0;
 677   for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
 678     /* Include non-open links here as mp->out.link will stay more correct */
 679     if (!fdl) {
 680       if (thislink == mp->out.link)
 681         fdl = dl;
 682       else
 683         thislink++;
 684     }
 685     nlinks++;
 686     if (dl->state == DATALINK_OPEN)
 687       nopenlinks++;
 688   }
 689
 690   if (!fdl) {
 691     fdl = bundle->links;
 692     if (!fdl)
 693       return 0;
 694     thislink = 0;
 695   }
 696
 697   total = 0;
 698   for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) {
 699     if (!dl) {
 700       dl = bundle->links;
 701       thislink = 0;
 702     }
 703
 704     if (dl->state != DATALINK_OPEN)
 705       continue;
 706
 707     if (dl->physical->out)
 708       /* this link has suffered a short write.  Let it continue */
 709       continue;
 710
 711     add = link_QueueLen(&dl->physical->link);
 712     if (add) {
 713       /* this link has got stuff already queued.  Let it continue */
 714       total += add;
 715       continue;
 716     }
 717
 718     if (!mp_QueueLen(mp)) {
 719       int mrutoosmall;
 720
 721       /*
 722        * If there's only a single open link in our bundle and we haven't got
 723        * MP level link compression, queue outbound traffic directly via that
 724        * link's protocol stack rather than using the MP link.  This results
 725        * in the outbound traffic going out as PROTO_IP or PROTO_IPV6 rather
 726        * than PROTO_MP.
 727        */
 728
 729       mrutoosmall = 0;
 730       sendasip = nopenlinks < 2;
 731       if (sendasip) {
 732         if (dl->physical->link.lcp.his_mru < mp->peer_mrru) {
 733           /*
 734            * Actually, forget it.  This test is done against the MRRU rather
 735            * than the packet size so that we don't end up sending some data
 736            * in MP fragments and some data in PROTO_IP packets.  That's just
 737            * too likely to upset some ppp implementations.
 738            */
 739           mrutoosmall = 1;
 740           sendasip = 0;
 741         }
 742       }
 743
 744       bestlink = sendasip ? &dl->physical->link : &mp->link;
 745       if (!ncp_PushPacket(&bundle->ncp, &mp->out.af, bestlink))
 746         break;  /* Nothing else to send */
 747
 748       if (mrutoosmall)
 749         log_Printf(LogDEBUG, "Don't send data as PROTO_IP, MRU < MRRU\n");
 750       else if (sendasip)
 751         log_Printf(LogDEBUG, "Sending data as PROTO_IP, not PROTO_MP\n");
 752
 753       if (sendasip) {
 754         add = link_QueueLen(&dl->physical->link);
 755         if (add) {
 756           /* this link has got stuff already queued.  Let it continue */
 757           total += add;
 758           continue;
 759         }
 760       }
 761     }
 762
 763     m = link_Dequeue(&mp->link);
 764     if (m) {
 765       len = m_length(m);
 766       begin = 1;
 767       end = 0;
 768
 769       while (!end) {
 770         if (dl->state == DATALINK_OPEN) {
 771           /* Write at most his_mru bytes to the physical link */
 772           if (len <= dl->physical->link.lcp.his_mru) {
 773             mo = m;
 774             end = 1;
 775             m_settype(mo, MB_MPOUT);
 776           } else {
 777             /* It's > his_mru, chop the packet (`m') into bits */
 778             mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT);
 779             len -= mo->m_len;
 780             m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len);
 781           }
 782           mp_Output(mp, bundle, &dl->physical->link, mo, begin, end);
 783           begin = 0;
 784         }
 785
 786         if (!end) {
 787           nlinks--;
 788           dl = dl->next;
 789           if (!dl) {
 790             dl = bundle->links;
 791             thislink = 0;
 792           } else
 793             thislink++;
 794         }
 795       }
 796     }
 797   }
 798   mp->out.link = thislink;              /* Start here next time */
 799
 800   return total;
 801 }
 802
 803 int
 804 mp_SetDatalinkBandwidth(struct cmdargs const *arg)
 805 {
 806   int val;
 807
 808   if (arg->argc != arg->argn+1)
 809     return -1;
 810
 811   val = atoi(arg->argv[arg->argn]);
 812   if (val <= 0) {
 813     log_Printf(LogWARN, "The link bandwidth must be greater than zero\n");
 814     return 1;
 815   }
 816   arg->cx->mp.bandwidth = val;
 817
 818   if (arg->cx->state == DATALINK_OPEN)
 819     bundle_CalculateBandwidth(arg->bundle);
 820
 821   return 0;
 822 }
 823
 824 int
 825 mp_ShowStatus(struct cmdargs const *arg)
 826 {
 827   struct mp *mp = &arg->bundle->ncp.mp;
 828
 829   prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in");
 830   if (mp->active) {
 831     struct mbuf *m, *lm;
 832     int bufs = 0;
 833
 834     lm = NULL;
 835     prompt_Printf(arg->prompt, "Socket:         %s\n",
 836                   mp->server.socket.sun_path);
 837     for (m = mp->inbufs; m; m = m->m_nextpkt) {
 838       bufs++;
 839       lm = m;
 840     }
 841     prompt_Printf(arg->prompt, "Pending frags:  %d", bufs);
 842     if (bufs) {
 843       struct mp_header mh;
 844       unsigned long first, last;
 845
 846       first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0;
 847       last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0;
 848       prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n",
 849                     first, last, (unsigned long)mp->seq.next_in,
 850                     (unsigned long)mp->seq.min_in);
 851       prompt_Printf(arg->prompt, "                First has %sbegin bit and "
 852                     "%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no ");
 853     }
 854     prompt_Printf(arg->prompt, "\n");
 855   }
 856
 857   prompt_Printf(arg->prompt, "\nMy Side:\n");
 858   if (mp->active) {
 859     prompt_Printf(arg->prompt, " Output SEQ:    %u\n", mp->out.seq);
 860     prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->local_mrru);
 861     prompt_Printf(arg->prompt, " Short Seq:     %s\n",
 862                   mp->local_is12bit ? "on" : "off");
 863   }
 864   prompt_Printf(arg->prompt, " Discriminator: %s\n",
 865                 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address,
 866                            mp->cfg.enddisc.len));
 867
 868   prompt_Printf(arg->prompt, "\nHis Side:\n");
 869   if (mp->active) {
 870     prompt_Printf(arg->prompt, " Auth Name:     %s\n", mp->peer.authname);
 871     prompt_Printf(arg->prompt, " Input SEQ:     %u\n", mp->seq.next_in);
 872     prompt_Printf(arg->prompt, " MRRU:          %u\n", mp->peer_mrru);
 873     prompt_Printf(arg->prompt, " Short Seq:     %s\n",
 874                   mp->peer_is12bit ? "on" : "off");
 875   }
 876   prompt_Printf(arg->prompt,   " Discriminator: %s\n",
 877                 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
 878                            mp->peer.enddisc.len));
 879
 880   prompt_Printf(arg->prompt, "\nDefaults:\n");
 881
 882   prompt_Printf(arg->prompt, " MRRU:          ");
 883   if (mp->cfg.mrru)
 884     prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru);
 885   else
 886     prompt_Printf(arg->prompt, "disabled\n");
 887   prompt_Printf(arg->prompt, " Short Seq:     %s\n",
 888                   command_ShowNegval(mp->cfg.shortseq));
 889   prompt_Printf(arg->prompt, " Discriminator: %s\n",
 890                   command_ShowNegval(mp->cfg.negenddisc));
 891   prompt_Printf(arg->prompt, " AutoLoad:      min %d%%, max %d%%,"
 892                 " period %d secs\n", mp->cfg.autoload.min,
 893                 mp->cfg.autoload.max, mp->cfg.autoload.period);
 894
 895   return 0;
 896 }
 897
 898 const char *
 899 mp_Enddisc(u_char c, const char *address, size_t len)
 900 {
 901   static char result[100];      /* Used immediately after it's returned */
 902   unsigned f, header;
 903
 904   switch (c) {
 905     case ENDDISC_NULL:
 906       sprintf(result, "Null Class");
 907       break;
 908
 909     case ENDDISC_LOCAL:
 910             snprintf(result, sizeof result, "Local Addr: %.*s", (int)len,
 911                 address);
 912       break;
 913
 914     case ENDDISC_IP:
 915       if (len == 4)
 916         snprintf(result, sizeof result, "IP %s",
 917                  inet_ntoa(*(const struct in_addr *)address));
 918       else
 919         sprintf(result, "IP[%zd] ???", len);
 920       break;
 921
 922     case ENDDISC_MAC:
 923       if (len == 6) {
 924         const u_char *m = (const u_char *)address;
 925         snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x",
 926                  m[0], m[1], m[2], m[3], m[4], m[5]);
 927       } else
 928         sprintf(result, "MAC[%zd] ???", len);
 929       break;
 930
 931     case ENDDISC_MAGIC:
 932       sprintf(result, "Magic: 0x");
 933       header = strlen(result);
 934       if (len + header + 1 > sizeof result)
 935         len = sizeof result - header - 1;
 936       for (f = 0; f < len; f++)
 937         sprintf(result + header + 2 * f, "%02x", address[f]);
 938       break;
 939
 940     case ENDDISC_PSN:
 941             snprintf(result, sizeof result, "PSN: %.*s", (int)len, address);
 942       break;
 943
 944     default:
 945       sprintf(result, "%d: ", (int)c);
 946       header = strlen(result);
 947       if (len + header + 1 > sizeof result)
 948         len = sizeof result - header - 1;
 949       for (f = 0; f < len; f++)
 950         sprintf(result + header + 2 * f, "%02x", address[f]);
 951       break;
 952   }
 953   return result;
 954 }
 955
 956 int
 957 mp_SetEnddisc(struct cmdargs const *arg)
 958 {
 959   struct mp *mp = &arg->bundle->ncp.mp;
 960   struct in_addr addr;
 961
 962   switch (bundle_Phase(arg->bundle)) {
 963     case PHASE_DEAD:
 964       break;
 965     case PHASE_ESTABLISH:
 966       /* Make sure none of our links are DATALINK_LCP or greater */
 967       if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) {
 968         log_Printf(LogWARN, "enddisc: Only changable before"
 969                    " LCP negotiations\n");
 970         return 1;
 971       }
 972       break;
 973     default:
 974       log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n");
 975       return 1;
 976   }
 977
 978   if (arg->argc == arg->argn) {
 979     mp->cfg.enddisc.class = 0;
 980     *mp->cfg.enddisc.address = '\0';
 981     mp->cfg.enddisc.len = 0;
 982   } else if (arg->argc > arg->argn) {
 983     if (!strcasecmp(arg->argv[arg->argn], "label")) {
 984       mp->cfg.enddisc.class = ENDDISC_LOCAL;
 985       strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label);
 986       mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
 987     } else if (!strcasecmp(arg->argv[arg->argn], "ip")) {
 988       if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
 989         ncprange_getip4addr(&arg->bundle->ncp.ipcp.cfg.my_range, &addr);
 990       else
 991         addr = arg->bundle->ncp.ipcp.my_ip;
 992       memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr);
 993       mp->cfg.enddisc.class = ENDDISC_IP;
 994       mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr;
 995     } else if (!strcasecmp(arg->argv[arg->argn], "mac")) {
 996       struct sockaddr_dl hwaddr;
 997
 998       if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
 999         ncprange_getip4addr(&arg->bundle->ncp.ipcp.cfg.my_range, &addr);
1000       else
1001         addr = arg->bundle->ncp.ipcp.my_ip;
1002
1003       if (arp_EtherAddr(addr, &hwaddr, 1)) {
1004         mp->cfg.enddisc.class = ENDDISC_MAC;
1005         memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen,
1006                hwaddr.sdl_alen);
1007         mp->cfg.enddisc.len = hwaddr.sdl_alen;
1008       } else {
1009         log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n",
1010                   inet_ntoa(addr));
1011         return 4;
1012       }
1013     } else if (!strcasecmp(arg->argv[arg->argn], "magic")) {
1014       int f;
1015
1016       randinit();
1017       for (f = 0; f < 20; f += sizeof(long))
1018         *(long *)(mp->cfg.enddisc.address + f) = random();
1019       mp->cfg.enddisc.class = ENDDISC_MAGIC;
1020       mp->cfg.enddisc.len = 20;
1021     } else if (!strcasecmp(arg->argv[arg->argn], "psn")) {
1022       if (arg->argc > arg->argn+1) {
1023         mp->cfg.enddisc.class = ENDDISC_PSN;
1024         strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]);
1025         mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
1026       } else {
1027         log_Printf(LogWARN, "PSN endpoint requires additional data\n");
1028         return 5;
1029       }
1030     } else {
1031       log_Printf(LogWARN, "%s: Unrecognised endpoint type\n",
1032                 arg->argv[arg->argn]);
1033       return 6;
1034     }
1035   }
1036
1037   return 0;
1038 }
1039
1040 static int
1041 mpserver_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e,
1042                    int *n)
1043 {
1044   struct mpserver *s = descriptor2mpserver(d);
1045   int result;
1046
1047   result = 0;
1048   if (s->send.dl != NULL) {
1049     /* We've connect()ed */
1050     if (!link_QueueLen(&s->send.dl->physical->link) &&
1051         !s->send.dl->physical->out) {
1052       /* Only send if we've transmitted all our data (i.e. the ConfigAck) */
1053       result -= datalink_RemoveFromSet(s->send.dl, r, w, e);
1054       bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
1055       s->send.dl = NULL;
1056       s->fd = -1;
1057     } else
1058       /* Never read from a datalink that's on death row ! */
1059       result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL);
1060   } else if (r && s->fd >= 0) {
1061     if (*n < s->fd + 1)
1062       *n = s->fd + 1;
1063     FD_SET(s->fd, r);
1064     log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
1065     result++;
1066   }
1067   return result;
1068 }
1069
1070 static int
1071 mpserver_IsSet(struct fdescriptor *d, const fd_set *fdset)
1072 {
1073   struct mpserver *s = descriptor2mpserver(d);
1074   return s->fd >= 0 && FD_ISSET(s->fd, fdset);
1075 }
1076
1077 static void
1078 mpserver_Read(struct fdescriptor *d, struct bundle *bundle,
1079               const fd_set *fdset __unused)
1080 {
1081   struct mpserver *s = descriptor2mpserver(d);
1082
1083   bundle_ReceiveDatalink(bundle, s->fd);
1084 }
1085
1086 static int
1087 mpserver_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused,
1088                const fd_set *fdset __unused)
1089 {
1090   /* We never want to write here ! */
1091   log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n");
1092   return 0;
1093 }
1094
1095 void
1096 mpserver_Init(struct mpserver *s)
1097 {
1098   s->desc.type = MPSERVER_DESCRIPTOR;
1099   s->desc.UpdateSet = mpserver_UpdateSet;
1100   s->desc.IsSet = mpserver_IsSet;
1101   s->desc.Read = mpserver_Read;
1102   s->desc.Write = mpserver_Write;
1103   s->send.dl = NULL;
1104   s->fd = -1;
1105   memset(&s->socket, '\0', sizeof s->socket);
1106 }
1107
1108 int
1109 mpserver_Open(struct mpserver *s, struct peerid *peer)
1110 {
1111   int f, l;
1112   mode_t mask;
1113
1114   if (s->fd != -1) {
1115     log_Printf(LogALERT, "Internal error !  mpserver already open\n");
1116     mpserver_Close(s);
1117   }
1118
1119   l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-",
1120                _PATH_VARRUN, peer->authname, peer->enddisc.class);
1121   if (l < 0) {
1122     log_Printf(LogERROR, "mpserver: snprintf(): %s\n", strerror(errno));
1123     return MPSERVER_FAILED;
1124   }
1125
1126   for (f = 0;
1127        f < peer->enddisc.len && (size_t)l < sizeof s->socket.sun_path - 2;
1128        f++) {
1129     snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l,
1130              "%02x", *(u_char *)(peer->enddisc.address+f));
1131     l += 2;
1132   }
1133
1134   s->socket.sun_family = AF_LOCAL;
1135   s->socket.sun_len = sizeof s->socket;
1136   s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0);
1137   if (s->fd < 0) {
1138     log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno));
1139     return MPSERVER_FAILED;
1140   }
1141
1142   setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket,
1143              sizeof s->socket);
1144   mask = umask(0177);
1145
1146   /*
1147    * Try to bind the socket.  If we succeed we play server, if we fail
1148    * we connect() and hand the link off.
1149    */
1150
1151   if (ID0bind_un(s->fd, &s->socket) < 0) {
1152     if (errno != EADDRINUSE) {
1153       log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n",
1154                 s->socket.sun_path, strerror(errno));
1155       umask(mask);
1156       close(s->fd);
1157       s->fd = -1;
1158       return MPSERVER_FAILED;
1159     }
1160
1161     /* So we're the sender */
1162     umask(mask);
1163     if (ID0connect_un(s->fd, &s->socket) < 0) {
1164       log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n",
1165                 s->socket.sun_path, strerror(errno));
1166       if (errno == ECONNREFUSED)
1167         log_Printf(LogPHASE, "          The previous server died badly !\n");
1168       close(s->fd);
1169       s->fd = -1;
1170       return MPSERVER_FAILED;
1171     }
1172
1173     /* Donate our link to the other guy */
1174     return MPSERVER_CONNECTED;
1175   }
1176
1177   return MPSERVER_LISTENING;
1178 }
1179
1180 void
1181 mpserver_Close(struct mpserver *s)
1182 {
1183   if (s->send.dl != NULL) {
1184     bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
1185     s->send.dl = NULL;
1186     s->fd = -1;
1187   } else if (s->fd >= 0) {
1188     close(s->fd);
1189     if (ID0unlink(s->socket.sun_path) == -1)
1190       log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path,
1191                 strerror(errno));
1192     memset(&s->socket, '\0', sizeof s->socket);
1193     s->fd = -1;
1194   }
1195 }
1196
1197 void
1198 mp_LinkLost(struct mp *mp, struct datalink *dl)
1199 {
1200   if (mp->seq.min_in == dl->mp.seq)
1201     /* We've lost the link that's holding everything up ! */
1202     mp_Assemble(mp, NULL, NULL);
1203 }
1204
1205 size_t
1206 mp_QueueLen(struct mp *mp)
1207 {
1208   return link_QueueLen(&mp->link);
1209 }