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 <stdlib.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <sys/stat.h> 44 #include <termios.h> 45 #include <unistd.h> 46 47 #include "layer.h" 48 #ifndef NONAT 49 #include "nat_cmd.h" 50 #endif 51 #include "vjcomp.h" 52 #include "ua.h" 53 #include "defs.h" 54 #include "command.h" 55 #include "mbuf.h" 56 #include "log.h" 57 #include "timer.h" 58 #include "fsm.h" 59 #include "iplist.h" 60 #include "throughput.h" 61 #include "slcompress.h" 62 #include "lqr.h" 63 #include "hdlc.h" 64 #include "ipcp.h" 65 #include "auth.h" 66 #include "lcp.h" 67 #include "async.h" 68 #include "ccp.h" 69 #include "link.h" 70 #include "descriptor.h" 71 #include "physical.h" 72 #include "chat.h" 73 #include "proto.h" 74 #include "filter.h" 75 #include "mp.h" 76 #include "chap.h" 77 #include "cbcp.h" 78 #include "datalink.h" 79 #ifndef NORADIUS 80 #include "radius.h" 81 #endif 82 #include "bundle.h" 83 #include "ip.h" 84 #include "prompt.h" 85 #include "id.h" 86 #include "arp.h" 87 88 void 89 peerid_Init(struct peerid *peer) 90 { 91 peer->enddisc.class = 0; 92 *peer->enddisc.address = '\0'; 93 peer->enddisc.len = 0; 94 *peer->authname = '\0'; 95 } 96 97 int 98 peerid_Equal(const struct peerid *p1, const struct peerid *p2) 99 { 100 return !strcmp(p1->authname, p2->authname) && 101 p1->enddisc.class == p2->enddisc.class && 102 p1->enddisc.len == p2->enddisc.len && 103 !memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len); 104 } 105 106 static u_int32_t 107 inc_seq(unsigned is12bit, u_int32_t seq) 108 { 109 seq++; 110 if (is12bit) { 111 if (seq & 0xfffff000) 112 seq = 0; 113 } else if (seq & 0xff000000) 114 seq = 0; 115 return seq; 116 } 117 118 static int 119 isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2) 120 { 121 u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200; 122 123 if (seq1 > max) { 124 if (seq2 < 0x200 || seq2 > seq1) 125 return 1; 126 } else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2) 127 return 1; 128 129 return 0; 130 } 131 132 static int 133 mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header) 134 { 135 if (mp->local_is12bit) { 136 u_int16_t val; 137 138 ua_ntohs(MBUF_CTOP(m), &val); 139 if (val & 0x3000) { 140 log_Printf(LogWARN, "Oops - MP header without required zero bits\n"); 141 return 0; 142 } 143 header->begin = val & 0x8000 ? 1 : 0; 144 header->end = val & 0x4000 ? 1 : 0; 145 header->seq = val & 0x0fff; 146 return 2; 147 } else { 148 ua_ntohl(MBUF_CTOP(m), &header->seq); 149 if (header->seq & 0x3f000000) { 150 log_Printf(LogWARN, "Oops - MP header without required zero bits\n"); 151 return 0; 152 } 153 header->begin = header->seq & 0x80000000 ? 1 : 0; 154 header->end = header->seq & 0x40000000 ? 1 : 0; 155 header->seq &= 0x00ffffff; 156 return 4; 157 } 158 } 159 160 static void 161 mp_LayerStart(void *v, struct fsm *fp) 162 { 163 /* The given FSM (ccp) is about to start up ! */ 164 } 165 166 static void 167 mp_LayerUp(void *v, struct fsm *fp) 168 { 169 /* The given fsm (ccp) is now up */ 170 } 171 172 static void 173 mp_LayerDown(void *v, struct fsm *fp) 174 { 175 /* The given FSM (ccp) has been told to come down */ 176 } 177 178 static void 179 mp_LayerFinish(void *v, struct fsm *fp) 180 { 181 /* The given fsm (ccp) is now down */ 182 if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE) 183 fsm_Open(fp); /* CCP goes to ST_STOPPED */ 184 } 185 186 static void 187 mp_UpDown(void *v) 188 { 189 struct mp *mp = (struct mp *)v; 190 int percent; 191 192 percent = mp->link.throughput.OctetsPerSecond * 800 / mp->bundle->bandwidth; 193 if (percent >= mp->cfg.autoload.max) { 194 log_Printf(LogDEBUG, "%d%% saturation - bring a link up ?\n", percent); 195 bundle_AutoAdjust(mp->bundle, percent, AUTO_UP); 196 } else if (percent <= mp->cfg.autoload.min) { 197 log_Printf(LogDEBUG, "%d%% saturation - bring a link down ?\n", percent); 198 bundle_AutoAdjust(mp->bundle, percent, AUTO_DOWN); 199 } 200 } 201 202 void 203 mp_StopAutoloadTimer(struct mp *mp) 204 { 205 throughput_stop(&mp->link.throughput); 206 } 207 208 void 209 mp_CheckAutoloadTimer(struct mp *mp) 210 { 211 if (mp->link.throughput.SamplePeriod != mp->cfg.autoload.period) { 212 throughput_destroy(&mp->link.throughput); 213 throughput_init(&mp->link.throughput, mp->cfg.autoload.period); 214 throughput_callback(&mp->link.throughput, mp_UpDown, mp); 215 } 216 217 if (bundle_WantAutoloadTimer(mp->bundle)) 218 throughput_start(&mp->link.throughput, "MP throughput", 1); 219 else 220 mp_StopAutoloadTimer(mp); 221 } 222 223 void 224 mp_RestartAutoloadTimer(struct mp *mp) 225 { 226 if (mp->link.throughput.SamplePeriod != mp->cfg.autoload.period) 227 mp_CheckAutoloadTimer(mp); 228 else 229 throughput_clear(&mp->link.throughput, THROUGHPUT_OVERALL, NULL); 230 } 231 232 void 233 mp_Init(struct mp *mp, struct bundle *bundle) 234 { 235 mp->peer_is12bit = mp->local_is12bit = 0; 236 mp->peer_mrru = mp->local_mrru = 0; 237 238 peerid_Init(&mp->peer); 239 240 mp->out.seq = 0; 241 mp->out.link = 0; 242 mp->seq.min_in = 0; 243 mp->seq.next_in = 0; 244 mp->inbufs = NULL; 245 mp->bundle = bundle; 246 247 mp->link.type = LOGICAL_LINK; 248 mp->link.name = "mp"; 249 mp->link.len = sizeof *mp; 250 251 mp->cfg.autoload.period = SAMPLE_PERIOD; 252 mp->cfg.autoload.min = mp->cfg.autoload.max = 0; 253 throughput_init(&mp->link.throughput, mp->cfg.autoload.period); 254 throughput_callback(&mp->link.throughput, mp_UpDown, mp); 255 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 256 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 257 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 258 259 mp->fsmp.LayerStart = mp_LayerStart; 260 mp->fsmp.LayerUp = mp_LayerUp; 261 mp->fsmp.LayerDown = mp_LayerDown; 262 mp->fsmp.LayerFinish = mp_LayerFinish; 263 mp->fsmp.object = mp; 264 265 mpserver_Init(&mp->server); 266 267 mp->cfg.mrru = 0; 268 mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED; 269 mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED; 270 mp->cfg.enddisc.class = 0; 271 *mp->cfg.enddisc.address = '\0'; 272 mp->cfg.enddisc.len = 0; 273 274 lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL); 275 ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp); 276 277 link_EmptyStack(&mp->link); 278 link_Stack(&mp->link, &protolayer); 279 link_Stack(&mp->link, &ccplayer); 280 link_Stack(&mp->link, &vjlayer); 281 #ifndef NONAT 282 link_Stack(&mp->link, &natlayer); 283 #endif 284 } 285 286 int 287 mp_Up(struct mp *mp, struct datalink *dl) 288 { 289 struct lcp *lcp = &dl->physical->link.lcp; 290 291 if (mp->active) { 292 /* We're adding a link - do a last validation on our parameters */ 293 if (!peerid_Equal(&dl->peer, &mp->peer)) { 294 log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name); 295 log_Printf(LogPHASE, " Attached to peer %s/%s\n", mp->peer.authname, 296 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 297 mp->peer.enddisc.len)); 298 log_Printf(LogPHASE, " New link is peer %s/%s\n", dl->peer.authname, 299 mp_Enddisc(dl->peer.enddisc.class, dl->peer.enddisc.address, 300 dl->peer.enddisc.len)); 301 return MP_FAILED; 302 } 303 if (mp->local_mrru != lcp->want_mrru || 304 mp->peer_mrru != lcp->his_mrru || 305 mp->local_is12bit != lcp->want_shortseq || 306 mp->peer_is12bit != lcp->his_shortseq) { 307 log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n", 308 dl->name); 309 return MP_FAILED; 310 } 311 return MP_ADDED; 312 } else { 313 /* First link in multilink mode */ 314 315 mp->local_mrru = lcp->want_mrru; 316 mp->peer_mrru = lcp->his_mrru; 317 mp->local_is12bit = lcp->want_shortseq; 318 mp->peer_is12bit = lcp->his_shortseq; 319 mp->peer = dl->peer; 320 321 throughput_destroy(&mp->link.throughput); 322 throughput_init(&mp->link.throughput, mp->cfg.autoload.period); 323 throughput_callback(&mp->link.throughput, mp_UpDown, mp); 324 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 325 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 326 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 327 328 mp->out.seq = 0; 329 mp->out.link = 0; 330 mp->seq.min_in = 0; 331 mp->seq.next_in = 0; 332 333 /* 334 * Now we create our server socket. 335 * If it already exists, join it. Otherwise, create and own it 336 */ 337 switch (mpserver_Open(&mp->server, &mp->peer)) { 338 case MPSERVER_CONNECTED: 339 log_Printf(LogPHASE, "mp: Transfer link on %s\n", 340 mp->server.socket.sun_path); 341 mp->server.send.dl = dl; /* Defer 'till it's safe to send */ 342 return MP_LINKSENT; 343 case MPSERVER_FAILED: 344 return MP_FAILED; 345 case MPSERVER_LISTENING: 346 log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path); 347 log_Printf(LogPHASE, " First link: %s\n", dl->name); 348 349 /* Re-point our IPCP layer at our MP link */ 350 ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link); 351 352 /* Our lcp's already up 'cos of the NULL parent */ 353 if (ccp_SetOpenMode(&mp->link.ccp)) { 354 fsm_Up(&mp->link.ccp.fsm); 355 fsm_Open(&mp->link.ccp.fsm); 356 } 357 358 mp->active = 1; 359 break; 360 } 361 } 362 363 return MP_UP; 364 } 365 366 void 367 mp_Down(struct mp *mp) 368 { 369 if (mp->active) { 370 struct mbuf *next; 371 372 /* Stop that ! */ 373 mp_StopAutoloadTimer(mp); 374 375 /* Don't want any more of these */ 376 mpserver_Close(&mp->server); 377 378 /* CCP goes down with a bang */ 379 fsm2initial(&mp->link.ccp.fsm); 380 381 /* Received fragments go in the bit-bucket */ 382 while (mp->inbufs) { 383 next = mp->inbufs->m_nextpkt; 384 m_freem(mp->inbufs); 385 mp->inbufs = next; 386 } 387 388 peerid_Init(&mp->peer); 389 mp->active = 0; 390 } 391 } 392 393 void 394 mp_linkInit(struct mp_link *mplink) 395 { 396 mplink->seq = 0; 397 mplink->bandwidth = 0; 398 } 399 400 static void 401 mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p) 402 { 403 struct mp_header mh, h; 404 struct mbuf *q, *last; 405 int32_t seq; 406 407 /* 408 * When `m' and `p' are NULL, it means our oldest link has gone down. 409 * We want to determine a new min, and process any intermediate stuff 410 * as normal 411 */ 412 413 if (m && mp_ReadHeader(mp, m, &mh) == 0) { 414 m_freem(m); 415 return; 416 } 417 418 if (p) { 419 seq = p->dl->mp.seq; 420 p->dl->mp.seq = mh.seq; 421 } else 422 seq = mp->seq.min_in; 423 424 if (mp->seq.min_in == seq) { 425 /* 426 * We've received new data on the link that has our min (oldest) seq. 427 * Figure out which link now has the smallest (oldest) seq. 428 */ 429 struct datalink *dl; 430 431 mp->seq.min_in = (u_int32_t)-1; 432 for (dl = mp->bundle->links; dl; dl = dl->next) 433 if (dl->state == DATALINK_OPEN && 434 (mp->seq.min_in == -1 || 435 isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in))) 436 mp->seq.min_in = dl->mp.seq; 437 } 438 439 /* 440 * Now process as many of our fragments as we can, adding our new 441 * fragment in as we go, and ordering with the oldest at the top of 442 * the queue. 443 */ 444 445 if (!mp->inbufs) { 446 mp->inbufs = m; 447 m = NULL; 448 } 449 450 last = NULL; 451 seq = mp->seq.next_in; 452 q = mp->inbufs; 453 while (q) { 454 mp_ReadHeader(mp, q, &h); 455 if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) { 456 /* Our received fragment fits in before this one, so link it in */ 457 if (last) 458 last->m_nextpkt = m; 459 else 460 mp->inbufs = m; 461 m->m_nextpkt = q; 462 q = m; 463 h = mh; 464 m = NULL; 465 } 466 467 if (h.seq != seq) { 468 /* we're missing something :-( */ 469 if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) { 470 /* we're never gonna get it */ 471 struct mbuf *next; 472 473 /* Zap all older fragments */ 474 while (mp->inbufs != q) { 475 log_Printf(LogDEBUG, "Drop frag\n"); 476 next = mp->inbufs->m_nextpkt; 477 m_freem(mp->inbufs); 478 mp->inbufs = next; 479 } 480 481 /* 482 * Zap everything until the next `end' fragment OR just before 483 * the next `begin' fragment OR 'till seq.min_in - whichever 484 * comes first. 485 */ 486 do { 487 mp_ReadHeader(mp, mp->inbufs, &h); 488 if (h.begin) { 489 /* We might be able to process this ! */ 490 h.seq--; /* We're gonna look for fragment with h.seq+1 */ 491 break; 492 } 493 next = mp->inbufs->m_nextpkt; 494 log_Printf(LogDEBUG, "Drop frag %u\n", h.seq); 495 m_freem(mp->inbufs); 496 mp->inbufs = next; 497 } while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in, 498 h.seq) || h.end)); 499 500 /* 501 * Continue processing things from here. 502 * This deals with the possibility that we received a fragment 503 * on the slowest link that invalidates some of our data (because 504 * of the hole at `q'), but where there are subsequent `whole' 505 * packets that have already been received. 506 */ 507 508 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 509 last = NULL; 510 q = mp->inbufs; 511 } else 512 /* we may still receive the missing fragment */ 513 break; 514 } else if (h.end) { 515 /* We've got something, reassemble */ 516 struct mbuf **frag = &q; 517 int len; 518 u_long first = -1; 519 520 do { 521 *frag = mp->inbufs; 522 mp->inbufs = mp->inbufs->m_nextpkt; 523 len = mp_ReadHeader(mp, *frag, &h); 524 if (first == -1) 525 first = h.seq; 526 (*frag)->m_offset += len; 527 (*frag)->m_len -= len; 528 (*frag)->m_nextpkt = NULL; 529 if (frag == &q && !h.begin) { 530 log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n", 531 (u_long)h.seq); 532 m_freem(q); 533 q = NULL; 534 } else if (frag != &q && h.begin) { 535 log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n", 536 (u_long)h.seq - 1); 537 /* 538 * Stuff our fragment back at the front of the queue and zap 539 * our half-assembed packet. 540 */ 541 (*frag)->m_nextpkt = mp->inbufs; 542 mp->inbufs = *frag; 543 *frag = NULL; 544 m_freem(q); 545 q = NULL; 546 frag = &q; 547 h.end = 0; /* just in case it's a whole packet */ 548 } else 549 do 550 frag = &(*frag)->m_next; 551 while (*frag != NULL); 552 } while (!h.end); 553 554 if (q) { 555 q = m_pullup(q); 556 log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n", 557 first, (u_long)h.seq, m_length(q)); 558 link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle); 559 m_freem(q); 560 } 561 562 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 563 last = NULL; 564 q = mp->inbufs; 565 } else { 566 /* Look for the next fragment */ 567 seq = inc_seq(mp->local_is12bit, seq); 568 last = q; 569 q = q->m_nextpkt; 570 } 571 } 572 573 if (m) { 574 /* We still have to find a home for our new fragment */ 575 last = NULL; 576 for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) { 577 mp_ReadHeader(mp, q, &h); 578 if (isbefore(mp->local_is12bit, mh.seq, h.seq)) 579 break; 580 } 581 /* Our received fragment fits in here */ 582 if (last) 583 last->m_nextpkt = m; 584 else 585 mp->inbufs = m; 586 m->m_nextpkt = q; 587 } 588 } 589 590 struct mbuf * 591 mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 592 { 593 struct physical *p = link2physical(l); 594 595 if (!bundle->ncp.mp.active) 596 /* Let someone else deal with it ! */ 597 return bp; 598 599 if (p == NULL) { 600 log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n"); 601 m_freem(bp); 602 } else { 603 m_settype(bp, MB_MPIN); 604 mp_Assemble(&bundle->ncp.mp, bp, p); 605 } 606 607 return NULL; 608 } 609 610 static void 611 mp_Output(struct mp *mp, struct bundle *bundle, struct link *l, 612 struct mbuf *m, u_int32_t begin, u_int32_t end) 613 { 614 char prepend[4]; 615 616 /* Stuff an MP header on the front of our packet and send it */ 617 618 if (mp->peer_is12bit) { 619 u_int16_t val; 620 621 val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq; 622 ua_htons(&val, prepend); 623 m = m_prepend(m, prepend, 2, 0); 624 } else { 625 u_int32_t val; 626 627 val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq; 628 ua_htonl(&val, prepend); 629 m = m_prepend(m, prepend, 4, 0); 630 } 631 if (log_IsKept(LogDEBUG)) 632 log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n", 633 mp->out.seq, m_length(m), l->name); 634 mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq); 635 636 link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP); 637 } 638 639 int 640 mp_FillQueues(struct bundle *bundle) 641 { 642 struct mp *mp = &bundle->ncp.mp; 643 struct datalink *dl, *fdl; 644 size_t total, add, len; 645 int thislink, nlinks; 646 u_int32_t begin, end; 647 struct mbuf *m, *mo; 648 649 thislink = nlinks = 0; 650 for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) { 651 /* Include non-open links here as mp->out.link will stay more correct */ 652 if (!fdl) { 653 if (thislink == mp->out.link) 654 fdl = dl; 655 else 656 thislink++; 657 } 658 nlinks++; 659 } 660 661 if (!fdl) { 662 fdl = bundle->links; 663 if (!fdl) 664 return 0; 665 thislink = 0; 666 } 667 668 total = 0; 669 for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) { 670 if (!dl) { 671 dl = bundle->links; 672 thislink = 0; 673 } 674 675 if (dl->state != DATALINK_OPEN) 676 continue; 677 678 if (dl->physical->out) 679 /* this link has suffered a short write. Let it continue */ 680 continue; 681 682 add = link_QueueLen(&dl->physical->link); 683 total += add; 684 if (add) 685 /* this link has got stuff already queued. Let it continue */ 686 continue; 687 688 if (!link_QueueLen(&mp->link) && !ip_PushPacket(&mp->link, bundle)) 689 /* Nothing else to send */ 690 break; 691 692 m = link_Dequeue(&mp->link); 693 len = m_length(m); 694 begin = 1; 695 end = 0; 696 697 while (!end) { 698 if (dl->state == DATALINK_OPEN) { 699 /* Write at most his_mru bytes to the physical link */ 700 if (len <= dl->physical->link.lcp.his_mru) { 701 mo = m; 702 end = 1; 703 m_settype(mo, MB_MPOUT); 704 } else { 705 /* It's > his_mru, chop the packet (`m') into bits */ 706 mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT); 707 len -= mo->m_len; 708 m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len); 709 } 710 mp_Output(mp, bundle, &dl->physical->link, mo, begin, end); 711 begin = 0; 712 } 713 714 if (!end) { 715 nlinks--; 716 dl = dl->next; 717 if (!dl) { 718 dl = bundle->links; 719 thislink = 0; 720 } else 721 thislink++; 722 } 723 } 724 } 725 mp->out.link = thislink; /* Start here next time */ 726 727 return total; 728 } 729 730 int 731 mp_SetDatalinkBandwidth(struct cmdargs const *arg) 732 { 733 int val; 734 735 if (arg->argc != arg->argn+1) 736 return -1; 737 738 val = atoi(arg->argv[arg->argn]); 739 if (val <= 0) { 740 log_Printf(LogWARN, "The link bandwidth must be greater than zero\n"); 741 return 1; 742 } 743 arg->cx->mp.bandwidth = val; 744 745 if (arg->cx->state == DATALINK_OPEN) 746 bundle_CalculateBandwidth(arg->bundle); 747 748 return 0; 749 } 750 751 int 752 mp_ShowStatus(struct cmdargs const *arg) 753 { 754 struct mp *mp = &arg->bundle->ncp.mp; 755 756 prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in"); 757 if (mp->active) { 758 struct mbuf *m, *lm; 759 int bufs = 0; 760 761 lm = NULL; 762 prompt_Printf(arg->prompt, "Socket: %s\n", 763 mp->server.socket.sun_path); 764 for (m = mp->inbufs; m; m = m->m_nextpkt) { 765 bufs++; 766 lm = m; 767 } 768 prompt_Printf(arg->prompt, "Pending frags: %d", bufs); 769 if (bufs) { 770 struct mp_header mh; 771 unsigned long first, last; 772 773 first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0; 774 last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0; 775 prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n", 776 first, last, (unsigned long)mp->seq.next_in, 777 (unsigned long)mp->seq.min_in); 778 prompt_Printf(arg->prompt, " First has %sbegin bit and " 779 "%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no "); 780 } 781 prompt_Printf(arg->prompt, "\n"); 782 } 783 784 prompt_Printf(arg->prompt, "\nMy Side:\n"); 785 if (mp->active) { 786 prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq); 787 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru); 788 prompt_Printf(arg->prompt, " Short Seq: %s\n", 789 mp->local_is12bit ? "on" : "off"); 790 } 791 prompt_Printf(arg->prompt, " Discriminator: %s\n", 792 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address, 793 mp->cfg.enddisc.len)); 794 795 prompt_Printf(arg->prompt, "\nHis Side:\n"); 796 if (mp->active) { 797 prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname); 798 prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in); 799 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru); 800 prompt_Printf(arg->prompt, " Short Seq: %s\n", 801 mp->peer_is12bit ? "on" : "off"); 802 } 803 prompt_Printf(arg->prompt, " Discriminator: %s\n", 804 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 805 mp->peer.enddisc.len)); 806 807 prompt_Printf(arg->prompt, "\nDefaults:\n"); 808 809 prompt_Printf(arg->prompt, " MRRU: "); 810 if (mp->cfg.mrru) 811 prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru); 812 else 813 prompt_Printf(arg->prompt, "disabled\n"); 814 prompt_Printf(arg->prompt, " Short Seq: %s\n", 815 command_ShowNegval(mp->cfg.shortseq)); 816 prompt_Printf(arg->prompt, " Discriminator: %s\n", 817 command_ShowNegval(mp->cfg.negenddisc)); 818 prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%," 819 " period %d secs\n", mp->cfg.autoload.min, 820 mp->cfg.autoload.max, mp->cfg.autoload.period); 821 822 return 0; 823 } 824 825 const char * 826 mp_Enddisc(u_char c, const char *address, int len) 827 { 828 static char result[100]; /* Used immediately after it's returned */ 829 int f, header; 830 831 switch (c) { 832 case ENDDISC_NULL: 833 sprintf(result, "Null Class"); 834 break; 835 836 case ENDDISC_LOCAL: 837 snprintf(result, sizeof result, "Local Addr: %.*s", len, address); 838 break; 839 840 case ENDDISC_IP: 841 if (len == 4) 842 snprintf(result, sizeof result, "IP %s", 843 inet_ntoa(*(const struct in_addr *)address)); 844 else 845 sprintf(result, "IP[%d] ???", len); 846 break; 847 848 case ENDDISC_MAC: 849 if (len == 6) { 850 const u_char *m = (const u_char *)address; 851 snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x", 852 m[0], m[1], m[2], m[3], m[4], m[5]); 853 } else 854 sprintf(result, "MAC[%d] ???", len); 855 break; 856 857 case ENDDISC_MAGIC: 858 sprintf(result, "Magic: 0x"); 859 header = strlen(result); 860 if (len > sizeof result - header - 1) 861 len = sizeof result - header - 1; 862 for (f = 0; f < len; f++) 863 sprintf(result + header + 2 * f, "%02x", address[f]); 864 break; 865 866 case ENDDISC_PSN: 867 snprintf(result, sizeof result, "PSN: %.*s", len, address); 868 break; 869 870 default: 871 sprintf(result, "%d: ", (int)c); 872 header = strlen(result); 873 if (len > sizeof result - header - 1) 874 len = sizeof result - header - 1; 875 for (f = 0; f < len; f++) 876 sprintf(result + header + 2 * f, "%02x", address[f]); 877 break; 878 } 879 return result; 880 } 881 882 int 883 mp_SetEnddisc(struct cmdargs const *arg) 884 { 885 struct mp *mp = &arg->bundle->ncp.mp; 886 struct in_addr addr; 887 888 switch (bundle_Phase(arg->bundle)) { 889 case PHASE_DEAD: 890 break; 891 case PHASE_ESTABLISH: 892 /* Make sure none of our links are DATALINK_LCP or greater */ 893 if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) { 894 log_Printf(LogWARN, "enddisc: Only changable before" 895 " LCP negotiations\n"); 896 return 1; 897 } 898 break; 899 default: 900 log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n"); 901 return 1; 902 } 903 904 if (arg->argc == arg->argn) { 905 mp->cfg.enddisc.class = 0; 906 *mp->cfg.enddisc.address = '\0'; 907 mp->cfg.enddisc.len = 0; 908 } else if (arg->argc > arg->argn) { 909 if (!strcasecmp(arg->argv[arg->argn], "label")) { 910 mp->cfg.enddisc.class = ENDDISC_LOCAL; 911 strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label); 912 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 913 } else if (!strcasecmp(arg->argv[arg->argn], "ip")) { 914 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 915 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 916 else 917 addr = arg->bundle->ncp.ipcp.my_ip; 918 memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr); 919 mp->cfg.enddisc.class = ENDDISC_IP; 920 mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr; 921 } else if (!strcasecmp(arg->argv[arg->argn], "mac")) { 922 struct sockaddr_dl hwaddr; 923 int s; 924 925 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 926 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 927 else 928 addr = arg->bundle->ncp.ipcp.my_ip; 929 930 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 931 if (s < 0) { 932 log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno)); 933 return 2; 934 } 935 if (get_ether_addr(s, addr, &hwaddr)) { 936 mp->cfg.enddisc.class = ENDDISC_MAC; 937 memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen, 938 hwaddr.sdl_alen); 939 mp->cfg.enddisc.len = hwaddr.sdl_alen; 940 } else { 941 log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n", 942 inet_ntoa(addr)); 943 close(s); 944 return 4; 945 } 946 close(s); 947 } else if (!strcasecmp(arg->argv[arg->argn], "magic")) { 948 int f; 949 950 randinit(); 951 for (f = 0; f < 20; f += sizeof(long)) 952 *(long *)(mp->cfg.enddisc.address + f) = random(); 953 mp->cfg.enddisc.class = ENDDISC_MAGIC; 954 mp->cfg.enddisc.len = 20; 955 } else if (!strcasecmp(arg->argv[arg->argn], "psn")) { 956 if (arg->argc > arg->argn+1) { 957 mp->cfg.enddisc.class = ENDDISC_PSN; 958 strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]); 959 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 960 } else { 961 log_Printf(LogWARN, "PSN endpoint requires additional data\n"); 962 return 5; 963 } 964 } else { 965 log_Printf(LogWARN, "%s: Unrecognised endpoint type\n", 966 arg->argv[arg->argn]); 967 return 6; 968 } 969 } 970 971 return 0; 972 } 973 974 static int 975 mpserver_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, 976 int *n) 977 { 978 struct mpserver *s = descriptor2mpserver(d); 979 int result; 980 981 result = 0; 982 if (s->send.dl != NULL) { 983 /* We've connect()ed */ 984 if (!link_QueueLen(&s->send.dl->physical->link) && 985 !s->send.dl->physical->out) { 986 /* Only send if we've transmitted all our data (i.e. the ConfigAck) */ 987 result -= datalink_RemoveFromSet(s->send.dl, r, w, e); 988 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 989 s->send.dl = NULL; 990 s->fd = -1; 991 } else 992 /* Never read from a datalink that's on death row ! */ 993 result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL); 994 } else if (r && s->fd >= 0) { 995 if (*n < s->fd + 1) 996 *n = s->fd + 1; 997 FD_SET(s->fd, r); 998 log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd); 999 result++; 1000 } 1001 return result; 1002 } 1003 1004 static int 1005 mpserver_IsSet(struct fdescriptor *d, const fd_set *fdset) 1006 { 1007 struct mpserver *s = descriptor2mpserver(d); 1008 return s->fd >= 0 && FD_ISSET(s->fd, fdset); 1009 } 1010 1011 static void 1012 mpserver_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1013 { 1014 struct mpserver *s = descriptor2mpserver(d); 1015 1016 bundle_ReceiveDatalink(bundle, s->fd); 1017 } 1018 1019 static int 1020 mpserver_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1021 { 1022 /* We never want to write here ! */ 1023 log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n"); 1024 return 0; 1025 } 1026 1027 void 1028 mpserver_Init(struct mpserver *s) 1029 { 1030 s->desc.type = MPSERVER_DESCRIPTOR; 1031 s->desc.UpdateSet = mpserver_UpdateSet; 1032 s->desc.IsSet = mpserver_IsSet; 1033 s->desc.Read = mpserver_Read; 1034 s->desc.Write = mpserver_Write; 1035 s->send.dl = NULL; 1036 s->fd = -1; 1037 memset(&s->socket, '\0', sizeof s->socket); 1038 } 1039 1040 int 1041 mpserver_Open(struct mpserver *s, struct peerid *peer) 1042 { 1043 int f, l; 1044 mode_t mask; 1045 1046 if (s->fd != -1) { 1047 log_Printf(LogALERT, "Internal error ! mpserver already open\n"); 1048 mpserver_Close(s); 1049 } 1050 1051 l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-", 1052 _PATH_VARRUN, peer->authname, peer->enddisc.class); 1053 1054 for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) { 1055 snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l, 1056 "%02x", *(u_char *)(peer->enddisc.address+f)); 1057 l += 2; 1058 } 1059 1060 s->socket.sun_family = AF_LOCAL; 1061 s->socket.sun_len = sizeof s->socket; 1062 s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0); 1063 if (s->fd < 0) { 1064 log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno)); 1065 return MPSERVER_FAILED; 1066 } 1067 1068 setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket, 1069 sizeof s->socket); 1070 mask = umask(0177); 1071 1072 /* 1073 * Try to bind the socket. If we succeed we play server, if we fail 1074 * we connect() and hand the link off. 1075 */ 1076 1077 if (ID0bind_un(s->fd, &s->socket) < 0) { 1078 if (errno != EADDRINUSE) { 1079 log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n", 1080 s->socket.sun_path, strerror(errno)); 1081 umask(mask); 1082 close(s->fd); 1083 s->fd = -1; 1084 return MPSERVER_FAILED; 1085 } 1086 1087 /* So we're the sender */ 1088 umask(mask); 1089 if (ID0connect_un(s->fd, &s->socket) < 0) { 1090 log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n", 1091 s->socket.sun_path, strerror(errno)); 1092 if (errno == ECONNREFUSED) 1093 log_Printf(LogPHASE, " The previous server died badly !\n"); 1094 close(s->fd); 1095 s->fd = -1; 1096 return MPSERVER_FAILED; 1097 } 1098 1099 /* Donate our link to the other guy */ 1100 return MPSERVER_CONNECTED; 1101 } 1102 1103 return MPSERVER_LISTENING; 1104 } 1105 1106 void 1107 mpserver_Close(struct mpserver *s) 1108 { 1109 if (s->send.dl != NULL) { 1110 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 1111 s->send.dl = NULL; 1112 s->fd = -1; 1113 } else if (s->fd >= 0) { 1114 close(s->fd); 1115 if (ID0unlink(s->socket.sun_path) == -1) 1116 log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path, 1117 strerror(errno)); 1118 memset(&s->socket, '\0', sizeof s->socket); 1119 s->fd = -1; 1120 } 1121 } 1122 1123 void 1124 mp_LinkLost(struct mp *mp, struct datalink *dl) 1125 { 1126 if (mp->seq.min_in == dl->mp.seq) 1127 /* We've lost the link that's holding everything up ! */ 1128 mp_Assemble(mp, NULL, NULL); 1129 } 1130 1131 void 1132 mp_DeleteQueue(struct mp *mp) 1133 { 1134 link_DeleteQueue(&mp->link); 1135 } 1136