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 last = NULL; 446 seq = mp->seq.next_in; 447 q = mp->inbufs; 448 while (q || m) { 449 if (!q) { 450 if (last) 451 last->m_nextpkt = m; 452 else 453 mp->inbufs = m; 454 q = m; 455 m = NULL; 456 h = mh; 457 } else { 458 mp_ReadHeader(mp, q, &h); 459 460 if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) { 461 /* Our received fragment fits in before this one, so link it in */ 462 if (last) 463 last->m_nextpkt = m; 464 else 465 mp->inbufs = m; 466 m->m_nextpkt = q; 467 q = m; 468 h = mh; 469 m = NULL; 470 } 471 } 472 473 if (h.seq != seq) { 474 /* we're missing something :-( */ 475 if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) { 476 /* we're never gonna get it */ 477 struct mbuf *next; 478 479 /* Zap all older fragments */ 480 while (mp->inbufs != q) { 481 log_Printf(LogDEBUG, "Drop frag\n"); 482 next = mp->inbufs->m_nextpkt; 483 m_freem(mp->inbufs); 484 mp->inbufs = next; 485 } 486 487 /* 488 * Zap everything until the next `end' fragment OR just before 489 * the next `begin' fragment OR 'till seq.min_in - whichever 490 * comes first. 491 */ 492 do { 493 mp_ReadHeader(mp, mp->inbufs, &h); 494 if (h.begin) { 495 /* We might be able to process this ! */ 496 h.seq--; /* We're gonna look for fragment with h.seq+1 */ 497 break; 498 } 499 next = mp->inbufs->m_nextpkt; 500 log_Printf(LogDEBUG, "Drop frag %u\n", h.seq); 501 m_freem(mp->inbufs); 502 mp->inbufs = next; 503 } while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in, 504 h.seq) || h.end)); 505 506 /* 507 * Continue processing things from here. 508 * This deals with the possibility that we received a fragment 509 * on the slowest link that invalidates some of our data (because 510 * of the hole at `q'), but where there are subsequent `whole' 511 * packets that have already been received. 512 */ 513 514 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 515 last = NULL; 516 q = mp->inbufs; 517 } else 518 /* we may still receive the missing fragment */ 519 break; 520 } else if (h.end) { 521 /* We've got something, reassemble */ 522 struct mbuf **frag = &q; 523 int len; 524 u_long first = -1; 525 526 do { 527 *frag = mp->inbufs; 528 mp->inbufs = mp->inbufs->m_nextpkt; 529 len = mp_ReadHeader(mp, *frag, &h); 530 if (first == -1) 531 first = h.seq; 532 (*frag)->m_offset += len; 533 (*frag)->m_len -= len; 534 (*frag)->m_nextpkt = NULL; 535 if (frag == &q && !h.begin) { 536 log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n", 537 (u_long)h.seq); 538 m_freem(q); 539 q = NULL; 540 } else if (frag != &q && h.begin) { 541 log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n", 542 (u_long)h.seq - 1); 543 /* 544 * Stuff our fragment back at the front of the queue and zap 545 * our half-assembed packet. 546 */ 547 (*frag)->m_nextpkt = mp->inbufs; 548 mp->inbufs = *frag; 549 *frag = NULL; 550 m_freem(q); 551 q = NULL; 552 frag = &q; 553 h.end = 0; /* just in case it's a whole packet */ 554 } else 555 do 556 frag = &(*frag)->m_next; 557 while (*frag != NULL); 558 } while (!h.end); 559 560 if (q) { 561 q = m_pullup(q); 562 log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n", 563 first, (u_long)h.seq, m_length(q)); 564 link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle); 565 m_freem(q); 566 } 567 568 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 569 last = NULL; 570 q = mp->inbufs; 571 } else { 572 /* Look for the next fragment */ 573 seq = inc_seq(mp->local_is12bit, seq); 574 last = q; 575 q = q->m_nextpkt; 576 } 577 } 578 579 if (m) { 580 /* We still have to find a home for our new fragment */ 581 last = NULL; 582 for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) { 583 mp_ReadHeader(mp, q, &h); 584 if (isbefore(mp->local_is12bit, mh.seq, h.seq)) 585 break; 586 } 587 /* Our received fragment fits in here */ 588 if (last) 589 last->m_nextpkt = m; 590 else 591 mp->inbufs = m; 592 m->m_nextpkt = q; 593 } 594 } 595 596 struct mbuf * 597 mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 598 { 599 struct physical *p = link2physical(l); 600 601 if (!bundle->ncp.mp.active) 602 /* Let someone else deal with it ! */ 603 return bp; 604 605 if (p == NULL) { 606 log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n"); 607 m_freem(bp); 608 } else { 609 m_settype(bp, MB_MPIN); 610 mp_Assemble(&bundle->ncp.mp, bp, p); 611 } 612 613 return NULL; 614 } 615 616 static void 617 mp_Output(struct mp *mp, struct bundle *bundle, struct link *l, 618 struct mbuf *m, u_int32_t begin, u_int32_t end) 619 { 620 char prepend[4]; 621 622 /* Stuff an MP header on the front of our packet and send it */ 623 624 if (mp->peer_is12bit) { 625 u_int16_t val; 626 627 val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq; 628 ua_htons(&val, prepend); 629 m = m_prepend(m, prepend, 2, 0); 630 } else { 631 u_int32_t val; 632 633 val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq; 634 ua_htonl(&val, prepend); 635 m = m_prepend(m, prepend, 4, 0); 636 } 637 if (log_IsKept(LogDEBUG)) 638 log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n", 639 mp->out.seq, m_length(m), l->name); 640 mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq); 641 642 link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP); 643 } 644 645 int 646 mp_FillQueues(struct bundle *bundle) 647 { 648 struct mp *mp = &bundle->ncp.mp; 649 struct datalink *dl, *fdl; 650 size_t total, add, len; 651 int thislink, nlinks; 652 u_int32_t begin, end; 653 struct mbuf *m, *mo; 654 655 thislink = nlinks = 0; 656 for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) { 657 /* Include non-open links here as mp->out.link will stay more correct */ 658 if (!fdl) { 659 if (thislink == mp->out.link) 660 fdl = dl; 661 else 662 thislink++; 663 } 664 nlinks++; 665 } 666 667 if (!fdl) { 668 fdl = bundle->links; 669 if (!fdl) 670 return 0; 671 thislink = 0; 672 } 673 674 total = 0; 675 for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) { 676 if (!dl) { 677 dl = bundle->links; 678 thislink = 0; 679 } 680 681 if (dl->state != DATALINK_OPEN) 682 continue; 683 684 if (dl->physical->out) 685 /* this link has suffered a short write. Let it continue */ 686 continue; 687 688 add = link_QueueLen(&dl->physical->link); 689 total += add; 690 if (add) 691 /* this link has got stuff already queued. Let it continue */ 692 continue; 693 694 if (!link_QueueLen(&mp->link) && !ip_PushPacket(&mp->link, bundle)) 695 /* Nothing else to send */ 696 break; 697 698 m = link_Dequeue(&mp->link); 699 len = m_length(m); 700 begin = 1; 701 end = 0; 702 703 while (!end) { 704 if (dl->state == DATALINK_OPEN) { 705 /* Write at most his_mru bytes to the physical link */ 706 if (len <= dl->physical->link.lcp.his_mru) { 707 mo = m; 708 end = 1; 709 m_settype(mo, MB_MPOUT); 710 } else { 711 /* It's > his_mru, chop the packet (`m') into bits */ 712 mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT); 713 len -= mo->m_len; 714 m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len); 715 } 716 mp_Output(mp, bundle, &dl->physical->link, mo, begin, end); 717 begin = 0; 718 } 719 720 if (!end) { 721 nlinks--; 722 dl = dl->next; 723 if (!dl) { 724 dl = bundle->links; 725 thislink = 0; 726 } else 727 thislink++; 728 } 729 } 730 } 731 mp->out.link = thislink; /* Start here next time */ 732 733 return total; 734 } 735 736 int 737 mp_SetDatalinkBandwidth(struct cmdargs const *arg) 738 { 739 int val; 740 741 if (arg->argc != arg->argn+1) 742 return -1; 743 744 val = atoi(arg->argv[arg->argn]); 745 if (val <= 0) { 746 log_Printf(LogWARN, "The link bandwidth must be greater than zero\n"); 747 return 1; 748 } 749 arg->cx->mp.bandwidth = val; 750 751 if (arg->cx->state == DATALINK_OPEN) 752 bundle_CalculateBandwidth(arg->bundle); 753 754 return 0; 755 } 756 757 int 758 mp_ShowStatus(struct cmdargs const *arg) 759 { 760 struct mp *mp = &arg->bundle->ncp.mp; 761 762 prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in"); 763 if (mp->active) { 764 struct mbuf *m, *lm; 765 int bufs = 0; 766 767 lm = NULL; 768 prompt_Printf(arg->prompt, "Socket: %s\n", 769 mp->server.socket.sun_path); 770 for (m = mp->inbufs; m; m = m->m_nextpkt) { 771 bufs++; 772 lm = m; 773 } 774 prompt_Printf(arg->prompt, "Pending frags: %d", bufs); 775 if (bufs) { 776 struct mp_header mh; 777 unsigned long first, last; 778 779 first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0; 780 last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0; 781 prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n", 782 first, last, (unsigned long)mp->seq.next_in, 783 (unsigned long)mp->seq.min_in); 784 prompt_Printf(arg->prompt, " First has %sbegin bit and " 785 "%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no "); 786 } 787 prompt_Printf(arg->prompt, "\n"); 788 } 789 790 prompt_Printf(arg->prompt, "\nMy Side:\n"); 791 if (mp->active) { 792 prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq); 793 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru); 794 prompt_Printf(arg->prompt, " Short Seq: %s\n", 795 mp->local_is12bit ? "on" : "off"); 796 } 797 prompt_Printf(arg->prompt, " Discriminator: %s\n", 798 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address, 799 mp->cfg.enddisc.len)); 800 801 prompt_Printf(arg->prompt, "\nHis Side:\n"); 802 if (mp->active) { 803 prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname); 804 prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in); 805 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru); 806 prompt_Printf(arg->prompt, " Short Seq: %s\n", 807 mp->peer_is12bit ? "on" : "off"); 808 } 809 prompt_Printf(arg->prompt, " Discriminator: %s\n", 810 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 811 mp->peer.enddisc.len)); 812 813 prompt_Printf(arg->prompt, "\nDefaults:\n"); 814 815 prompt_Printf(arg->prompt, " MRRU: "); 816 if (mp->cfg.mrru) 817 prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru); 818 else 819 prompt_Printf(arg->prompt, "disabled\n"); 820 prompt_Printf(arg->prompt, " Short Seq: %s\n", 821 command_ShowNegval(mp->cfg.shortseq)); 822 prompt_Printf(arg->prompt, " Discriminator: %s\n", 823 command_ShowNegval(mp->cfg.negenddisc)); 824 prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%," 825 " period %d secs\n", mp->cfg.autoload.min, 826 mp->cfg.autoload.max, mp->cfg.autoload.period); 827 828 return 0; 829 } 830 831 const char * 832 mp_Enddisc(u_char c, const char *address, int len) 833 { 834 static char result[100]; /* Used immediately after it's returned */ 835 int f, header; 836 837 switch (c) { 838 case ENDDISC_NULL: 839 sprintf(result, "Null Class"); 840 break; 841 842 case ENDDISC_LOCAL: 843 snprintf(result, sizeof result, "Local Addr: %.*s", len, address); 844 break; 845 846 case ENDDISC_IP: 847 if (len == 4) 848 snprintf(result, sizeof result, "IP %s", 849 inet_ntoa(*(const struct in_addr *)address)); 850 else 851 sprintf(result, "IP[%d] ???", len); 852 break; 853 854 case ENDDISC_MAC: 855 if (len == 6) { 856 const u_char *m = (const u_char *)address; 857 snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x", 858 m[0], m[1], m[2], m[3], m[4], m[5]); 859 } else 860 sprintf(result, "MAC[%d] ???", len); 861 break; 862 863 case ENDDISC_MAGIC: 864 sprintf(result, "Magic: 0x"); 865 header = strlen(result); 866 if (len > sizeof result - header - 1) 867 len = sizeof result - header - 1; 868 for (f = 0; f < len; f++) 869 sprintf(result + header + 2 * f, "%02x", address[f]); 870 break; 871 872 case ENDDISC_PSN: 873 snprintf(result, sizeof result, "PSN: %.*s", len, address); 874 break; 875 876 default: 877 sprintf(result, "%d: ", (int)c); 878 header = strlen(result); 879 if (len > sizeof result - header - 1) 880 len = sizeof result - header - 1; 881 for (f = 0; f < len; f++) 882 sprintf(result + header + 2 * f, "%02x", address[f]); 883 break; 884 } 885 return result; 886 } 887 888 int 889 mp_SetEnddisc(struct cmdargs const *arg) 890 { 891 struct mp *mp = &arg->bundle->ncp.mp; 892 struct in_addr addr; 893 894 switch (bundle_Phase(arg->bundle)) { 895 case PHASE_DEAD: 896 break; 897 case PHASE_ESTABLISH: 898 /* Make sure none of our links are DATALINK_LCP or greater */ 899 if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) { 900 log_Printf(LogWARN, "enddisc: Only changable before" 901 " LCP negotiations\n"); 902 return 1; 903 } 904 break; 905 default: 906 log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n"); 907 return 1; 908 } 909 910 if (arg->argc == arg->argn) { 911 mp->cfg.enddisc.class = 0; 912 *mp->cfg.enddisc.address = '\0'; 913 mp->cfg.enddisc.len = 0; 914 } else if (arg->argc > arg->argn) { 915 if (!strcasecmp(arg->argv[arg->argn], "label")) { 916 mp->cfg.enddisc.class = ENDDISC_LOCAL; 917 strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label); 918 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 919 } else if (!strcasecmp(arg->argv[arg->argn], "ip")) { 920 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 921 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 922 else 923 addr = arg->bundle->ncp.ipcp.my_ip; 924 memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr); 925 mp->cfg.enddisc.class = ENDDISC_IP; 926 mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr; 927 } else if (!strcasecmp(arg->argv[arg->argn], "mac")) { 928 struct sockaddr_dl hwaddr; 929 int s; 930 931 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 932 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 933 else 934 addr = arg->bundle->ncp.ipcp.my_ip; 935 936 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 937 if (s < 0) { 938 log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno)); 939 return 2; 940 } 941 if (get_ether_addr(s, addr, &hwaddr)) { 942 mp->cfg.enddisc.class = ENDDISC_MAC; 943 memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen, 944 hwaddr.sdl_alen); 945 mp->cfg.enddisc.len = hwaddr.sdl_alen; 946 } else { 947 log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n", 948 inet_ntoa(addr)); 949 close(s); 950 return 4; 951 } 952 close(s); 953 } else if (!strcasecmp(arg->argv[arg->argn], "magic")) { 954 int f; 955 956 randinit(); 957 for (f = 0; f < 20; f += sizeof(long)) 958 *(long *)(mp->cfg.enddisc.address + f) = random(); 959 mp->cfg.enddisc.class = ENDDISC_MAGIC; 960 mp->cfg.enddisc.len = 20; 961 } else if (!strcasecmp(arg->argv[arg->argn], "psn")) { 962 if (arg->argc > arg->argn+1) { 963 mp->cfg.enddisc.class = ENDDISC_PSN; 964 strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]); 965 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 966 } else { 967 log_Printf(LogWARN, "PSN endpoint requires additional data\n"); 968 return 5; 969 } 970 } else { 971 log_Printf(LogWARN, "%s: Unrecognised endpoint type\n", 972 arg->argv[arg->argn]); 973 return 6; 974 } 975 } 976 977 return 0; 978 } 979 980 static int 981 mpserver_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, 982 int *n) 983 { 984 struct mpserver *s = descriptor2mpserver(d); 985 int result; 986 987 result = 0; 988 if (s->send.dl != NULL) { 989 /* We've connect()ed */ 990 if (!link_QueueLen(&s->send.dl->physical->link) && 991 !s->send.dl->physical->out) { 992 /* Only send if we've transmitted all our data (i.e. the ConfigAck) */ 993 result -= datalink_RemoveFromSet(s->send.dl, r, w, e); 994 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 995 s->send.dl = NULL; 996 s->fd = -1; 997 } else 998 /* Never read from a datalink that's on death row ! */ 999 result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL); 1000 } else if (r && s->fd >= 0) { 1001 if (*n < s->fd + 1) 1002 *n = s->fd + 1; 1003 FD_SET(s->fd, r); 1004 log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd); 1005 result++; 1006 } 1007 return result; 1008 } 1009 1010 static int 1011 mpserver_IsSet(struct fdescriptor *d, const fd_set *fdset) 1012 { 1013 struct mpserver *s = descriptor2mpserver(d); 1014 return s->fd >= 0 && FD_ISSET(s->fd, fdset); 1015 } 1016 1017 static void 1018 mpserver_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1019 { 1020 struct mpserver *s = descriptor2mpserver(d); 1021 1022 bundle_ReceiveDatalink(bundle, s->fd); 1023 } 1024 1025 static int 1026 mpserver_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1027 { 1028 /* We never want to write here ! */ 1029 log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n"); 1030 return 0; 1031 } 1032 1033 void 1034 mpserver_Init(struct mpserver *s) 1035 { 1036 s->desc.type = MPSERVER_DESCRIPTOR; 1037 s->desc.UpdateSet = mpserver_UpdateSet; 1038 s->desc.IsSet = mpserver_IsSet; 1039 s->desc.Read = mpserver_Read; 1040 s->desc.Write = mpserver_Write; 1041 s->send.dl = NULL; 1042 s->fd = -1; 1043 memset(&s->socket, '\0', sizeof s->socket); 1044 } 1045 1046 int 1047 mpserver_Open(struct mpserver *s, struct peerid *peer) 1048 { 1049 int f, l; 1050 mode_t mask; 1051 1052 if (s->fd != -1) { 1053 log_Printf(LogALERT, "Internal error ! mpserver already open\n"); 1054 mpserver_Close(s); 1055 } 1056 1057 l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-", 1058 _PATH_VARRUN, peer->authname, peer->enddisc.class); 1059 1060 for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) { 1061 snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l, 1062 "%02x", *(u_char *)(peer->enddisc.address+f)); 1063 l += 2; 1064 } 1065 1066 s->socket.sun_family = AF_LOCAL; 1067 s->socket.sun_len = sizeof s->socket; 1068 s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0); 1069 if (s->fd < 0) { 1070 log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno)); 1071 return MPSERVER_FAILED; 1072 } 1073 1074 setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket, 1075 sizeof s->socket); 1076 mask = umask(0177); 1077 1078 /* 1079 * Try to bind the socket. If we succeed we play server, if we fail 1080 * we connect() and hand the link off. 1081 */ 1082 1083 if (ID0bind_un(s->fd, &s->socket) < 0) { 1084 if (errno != EADDRINUSE) { 1085 log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n", 1086 s->socket.sun_path, strerror(errno)); 1087 umask(mask); 1088 close(s->fd); 1089 s->fd = -1; 1090 return MPSERVER_FAILED; 1091 } 1092 1093 /* So we're the sender */ 1094 umask(mask); 1095 if (ID0connect_un(s->fd, &s->socket) < 0) { 1096 log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n", 1097 s->socket.sun_path, strerror(errno)); 1098 if (errno == ECONNREFUSED) 1099 log_Printf(LogPHASE, " The previous server died badly !\n"); 1100 close(s->fd); 1101 s->fd = -1; 1102 return MPSERVER_FAILED; 1103 } 1104 1105 /* Donate our link to the other guy */ 1106 return MPSERVER_CONNECTED; 1107 } 1108 1109 return MPSERVER_LISTENING; 1110 } 1111 1112 void 1113 mpserver_Close(struct mpserver *s) 1114 { 1115 if (s->send.dl != NULL) { 1116 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 1117 s->send.dl = NULL; 1118 s->fd = -1; 1119 } else if (s->fd >= 0) { 1120 close(s->fd); 1121 if (ID0unlink(s->socket.sun_path) == -1) 1122 log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path, 1123 strerror(errno)); 1124 memset(&s->socket, '\0', sizeof s->socket); 1125 s->fd = -1; 1126 } 1127 } 1128 1129 void 1130 mp_LinkLost(struct mp *mp, struct datalink *dl) 1131 { 1132 if (mp->seq.min_in == dl->mp.seq) 1133 /* We've lost the link that's holding everything up ! */ 1134 mp_Assemble(mp, NULL, NULL); 1135 } 1136 1137 void 1138 mp_DeleteQueue(struct mp *mp) 1139 { 1140 link_DeleteQueue(&mp->link); 1141 } 1142