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 bundle_CalculateBandwidth(fp->bundle); /* Against ccp_MTUOverhead */ 172 } 173 174 static void 175 mp_LayerDown(void *v, struct fsm *fp) 176 { 177 /* The given FSM (ccp) has been told to come down */ 178 } 179 180 static void 181 mp_LayerFinish(void *v, struct fsm *fp) 182 { 183 /* The given fsm (ccp) is now down */ 184 if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE) 185 fsm_Open(fp); /* CCP goes to ST_STOPPED */ 186 } 187 188 static void 189 mp_UpDown(void *v) 190 { 191 struct mp *mp = (struct mp *)v; 192 int percent; 193 194 percent = MAX(mp->link.stats.total.in.OctetsPerSecond, 195 mp->link.stats.total.out.OctetsPerSecond) * 800 / 196 mp->bundle->bandwidth; 197 if (percent >= mp->cfg.autoload.max) { 198 log_Printf(LogDEBUG, "%d%% saturation - bring a link up ?\n", percent); 199 bundle_AutoAdjust(mp->bundle, percent, AUTO_UP); 200 } else if (percent <= mp->cfg.autoload.min) { 201 log_Printf(LogDEBUG, "%d%% saturation - bring a link down ?\n", percent); 202 bundle_AutoAdjust(mp->bundle, percent, AUTO_DOWN); 203 } 204 } 205 206 void 207 mp_StopAutoloadTimer(struct mp *mp) 208 { 209 throughput_stop(&mp->link.stats.total); 210 } 211 212 void 213 mp_CheckAutoloadTimer(struct mp *mp) 214 { 215 if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) { 216 throughput_destroy(&mp->link.stats.total); 217 throughput_init(&mp->link.stats.total, mp->cfg.autoload.period); 218 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 219 } 220 221 if (bundle_WantAutoloadTimer(mp->bundle)) 222 throughput_start(&mp->link.stats.total, "MP throughput", 1); 223 else 224 mp_StopAutoloadTimer(mp); 225 } 226 227 void 228 mp_RestartAutoloadTimer(struct mp *mp) 229 { 230 if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) 231 mp_CheckAutoloadTimer(mp); 232 else 233 throughput_clear(&mp->link.stats.total, THROUGHPUT_OVERALL, NULL); 234 } 235 236 void 237 mp_Init(struct mp *mp, struct bundle *bundle) 238 { 239 mp->peer_is12bit = mp->local_is12bit = 0; 240 mp->peer_mrru = mp->local_mrru = 0; 241 242 peerid_Init(&mp->peer); 243 244 mp->out.seq = 0; 245 mp->out.link = 0; 246 mp->seq.min_in = 0; 247 mp->seq.next_in = 0; 248 mp->inbufs = NULL; 249 mp->bundle = bundle; 250 251 mp->link.type = LOGICAL_LINK; 252 mp->link.name = "mp"; 253 mp->link.len = sizeof *mp; 254 255 mp->cfg.autoload.period = SAMPLE_PERIOD; 256 mp->cfg.autoload.min = mp->cfg.autoload.max = 0; 257 throughput_init(&mp->link.stats.total, mp->cfg.autoload.period); 258 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 259 mp->link.stats.parent = NULL; 260 mp->link.stats.gather = 0; /* Let the physical links gather stats */ 261 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 262 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 263 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 264 265 mp->fsmp.LayerStart = mp_LayerStart; 266 mp->fsmp.LayerUp = mp_LayerUp; 267 mp->fsmp.LayerDown = mp_LayerDown; 268 mp->fsmp.LayerFinish = mp_LayerFinish; 269 mp->fsmp.object = mp; 270 271 mpserver_Init(&mp->server); 272 273 mp->cfg.mrru = 0; 274 mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED; 275 mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED; 276 mp->cfg.enddisc.class = 0; 277 *mp->cfg.enddisc.address = '\0'; 278 mp->cfg.enddisc.len = 0; 279 280 lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL); 281 ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp); 282 283 link_EmptyStack(&mp->link); 284 link_Stack(&mp->link, &protolayer); 285 link_Stack(&mp->link, &ccplayer); 286 link_Stack(&mp->link, &vjlayer); 287 #ifndef NONAT 288 link_Stack(&mp->link, &natlayer); 289 #endif 290 } 291 292 int 293 mp_Up(struct mp *mp, struct datalink *dl) 294 { 295 struct lcp *lcp = &dl->physical->link.lcp; 296 297 if (mp->active) { 298 /* We're adding a link - do a last validation on our parameters */ 299 if (!peerid_Equal(&dl->peer, &mp->peer)) { 300 log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name); 301 log_Printf(LogPHASE, " Attached to peer %s/%s\n", mp->peer.authname, 302 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 303 mp->peer.enddisc.len)); 304 log_Printf(LogPHASE, " New link is peer %s/%s\n", dl->peer.authname, 305 mp_Enddisc(dl->peer.enddisc.class, dl->peer.enddisc.address, 306 dl->peer.enddisc.len)); 307 return MP_FAILED; 308 } 309 if (mp->local_mrru != lcp->want_mrru || 310 mp->peer_mrru != lcp->his_mrru || 311 mp->local_is12bit != lcp->want_shortseq || 312 mp->peer_is12bit != lcp->his_shortseq) { 313 log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n", 314 dl->name); 315 return MP_FAILED; 316 } 317 return MP_ADDED; 318 } else { 319 /* First link in multilink mode */ 320 321 mp->local_mrru = lcp->want_mrru; 322 mp->peer_mrru = lcp->his_mrru; 323 mp->local_is12bit = lcp->want_shortseq; 324 mp->peer_is12bit = lcp->his_shortseq; 325 mp->peer = dl->peer; 326 327 throughput_destroy(&mp->link.stats.total); 328 throughput_init(&mp->link.stats.total, mp->cfg.autoload.period); 329 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 330 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 331 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 332 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 333 334 /* Tell the link who it belongs to */ 335 dl->physical->link.stats.parent = &mp->link.stats.total; 336 337 mp->out.seq = 0; 338 mp->out.link = 0; 339 mp->seq.min_in = 0; 340 mp->seq.next_in = 0; 341 342 /* 343 * Now we create our server socket. 344 * If it already exists, join it. Otherwise, create and own it 345 */ 346 switch (mpserver_Open(&mp->server, &mp->peer)) { 347 case MPSERVER_CONNECTED: 348 log_Printf(LogPHASE, "mp: Transfer link on %s\n", 349 mp->server.socket.sun_path); 350 mp->server.send.dl = dl; /* Defer 'till it's safe to send */ 351 return MP_LINKSENT; 352 case MPSERVER_FAILED: 353 return MP_FAILED; 354 case MPSERVER_LISTENING: 355 log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path); 356 log_Printf(LogPHASE, " First link: %s\n", dl->name); 357 358 /* Re-point our IPCP layer at our MP link */ 359 ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link); 360 361 /* Our lcp's already up 'cos of the NULL parent */ 362 if (ccp_SetOpenMode(&mp->link.ccp)) { 363 fsm_Up(&mp->link.ccp.fsm); 364 fsm_Open(&mp->link.ccp.fsm); 365 } 366 367 mp->active = 1; 368 break; 369 } 370 } 371 372 return MP_UP; 373 } 374 375 void 376 mp_Down(struct mp *mp) 377 { 378 if (mp->active) { 379 struct mbuf *next; 380 381 /* Stop that ! */ 382 mp_StopAutoloadTimer(mp); 383 384 /* Don't want any more of these */ 385 mpserver_Close(&mp->server); 386 387 /* CCP goes down with a bang */ 388 fsm2initial(&mp->link.ccp.fsm); 389 390 /* Received fragments go in the bit-bucket */ 391 while (mp->inbufs) { 392 next = mp->inbufs->m_nextpkt; 393 m_freem(mp->inbufs); 394 mp->inbufs = next; 395 } 396 397 peerid_Init(&mp->peer); 398 mp->active = 0; 399 } 400 } 401 402 void 403 mp_linkInit(struct mp_link *mplink) 404 { 405 mplink->seq = 0; 406 mplink->bandwidth = 0; 407 } 408 409 static void 410 mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p) 411 { 412 struct mp_header mh, h; 413 struct mbuf *q, *last; 414 int32_t seq; 415 416 /* 417 * When `m' and `p' are NULL, it means our oldest link has gone down. 418 * We want to determine a new min, and process any intermediate stuff 419 * as normal 420 */ 421 422 if (m && mp_ReadHeader(mp, m, &mh) == 0) { 423 m_freem(m); 424 return; 425 } 426 427 if (p) { 428 seq = p->dl->mp.seq; 429 p->dl->mp.seq = mh.seq; 430 } else 431 seq = mp->seq.min_in; 432 433 if (mp->seq.min_in == seq) { 434 /* 435 * We've received new data on the link that has our min (oldest) seq. 436 * Figure out which link now has the smallest (oldest) seq. 437 */ 438 struct datalink *dl; 439 440 mp->seq.min_in = (u_int32_t)-1; 441 for (dl = mp->bundle->links; dl; dl = dl->next) 442 if (dl->state == DATALINK_OPEN && 443 (mp->seq.min_in == -1 || 444 isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in))) 445 mp->seq.min_in = dl->mp.seq; 446 } 447 448 /* 449 * Now process as many of our fragments as we can, adding our new 450 * fragment in as we go, and ordering with the oldest at the top of 451 * the queue. 452 */ 453 454 last = NULL; 455 seq = mp->seq.next_in; 456 q = mp->inbufs; 457 while (q || m) { 458 if (!q) { 459 if (last) 460 last->m_nextpkt = m; 461 else 462 mp->inbufs = m; 463 q = m; 464 m = NULL; 465 h = mh; 466 } else { 467 mp_ReadHeader(mp, q, &h); 468 469 if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) { 470 /* Our received fragment fits in before this one, so link it in */ 471 if (last) 472 last->m_nextpkt = m; 473 else 474 mp->inbufs = m; 475 m->m_nextpkt = q; 476 q = m; 477 h = mh; 478 m = NULL; 479 } 480 } 481 482 if (h.seq != seq) { 483 /* we're missing something :-( */ 484 if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) { 485 /* we're never gonna get it */ 486 struct mbuf *next; 487 488 /* Zap all older fragments */ 489 while (mp->inbufs != q) { 490 log_Printf(LogDEBUG, "Drop frag\n"); 491 next = mp->inbufs->m_nextpkt; 492 m_freem(mp->inbufs); 493 mp->inbufs = next; 494 } 495 496 /* 497 * Zap everything until the next `end' fragment OR just before 498 * the next `begin' fragment OR 'till seq.min_in - whichever 499 * comes first. 500 */ 501 do { 502 mp_ReadHeader(mp, mp->inbufs, &h); 503 if (h.begin) { 504 /* We might be able to process this ! */ 505 h.seq--; /* We're gonna look for fragment with h.seq+1 */ 506 break; 507 } 508 next = mp->inbufs->m_nextpkt; 509 log_Printf(LogDEBUG, "Drop frag %u\n", h.seq); 510 m_freem(mp->inbufs); 511 mp->inbufs = next; 512 } while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in, 513 h.seq) || h.end)); 514 515 /* 516 * Continue processing things from here. 517 * This deals with the possibility that we received a fragment 518 * on the slowest link that invalidates some of our data (because 519 * of the hole at `q'), but where there are subsequent `whole' 520 * packets that have already been received. 521 */ 522 523 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 524 last = NULL; 525 q = mp->inbufs; 526 } else 527 /* we may still receive the missing fragment */ 528 break; 529 } else if (h.end) { 530 /* We've got something, reassemble */ 531 struct mbuf **frag = &q; 532 int len; 533 u_long first = -1; 534 535 do { 536 *frag = mp->inbufs; 537 mp->inbufs = mp->inbufs->m_nextpkt; 538 len = mp_ReadHeader(mp, *frag, &h); 539 if (first == -1) 540 first = h.seq; 541 (*frag)->m_offset += len; 542 (*frag)->m_len -= len; 543 (*frag)->m_nextpkt = NULL; 544 if (frag == &q && !h.begin) { 545 log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n", 546 (u_long)h.seq); 547 m_freem(q); 548 q = NULL; 549 } else if (frag != &q && h.begin) { 550 log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n", 551 (u_long)h.seq - 1); 552 /* 553 * Stuff our fragment back at the front of the queue and zap 554 * our half-assembed packet. 555 */ 556 (*frag)->m_nextpkt = mp->inbufs; 557 mp->inbufs = *frag; 558 *frag = NULL; 559 m_freem(q); 560 q = NULL; 561 frag = &q; 562 h.end = 0; /* just in case it's a whole packet */ 563 } else 564 do 565 frag = &(*frag)->m_next; 566 while (*frag != NULL); 567 } while (!h.end); 568 569 if (q) { 570 q = m_pullup(q); 571 log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n", 572 first, (u_long)h.seq, m_length(q)); 573 link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle); 574 m_freem(q); 575 } 576 577 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 578 last = NULL; 579 q = mp->inbufs; 580 } else { 581 /* Look for the next fragment */ 582 seq = inc_seq(mp->local_is12bit, seq); 583 last = q; 584 q = q->m_nextpkt; 585 } 586 } 587 588 if (m) { 589 /* We still have to find a home for our new fragment */ 590 last = NULL; 591 for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) { 592 mp_ReadHeader(mp, q, &h); 593 if (isbefore(mp->local_is12bit, mh.seq, h.seq)) 594 break; 595 } 596 /* Our received fragment fits in here */ 597 if (last) 598 last->m_nextpkt = m; 599 else 600 mp->inbufs = m; 601 m->m_nextpkt = q; 602 } 603 } 604 605 struct mbuf * 606 mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 607 { 608 struct physical *p = link2physical(l); 609 610 if (!bundle->ncp.mp.active) 611 /* Let someone else deal with it ! */ 612 return bp; 613 614 if (p == NULL) { 615 log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n"); 616 m_freem(bp); 617 } else { 618 m_settype(bp, MB_MPIN); 619 mp_Assemble(&bundle->ncp.mp, bp, p); 620 } 621 622 return NULL; 623 } 624 625 static void 626 mp_Output(struct mp *mp, struct bundle *bundle, struct link *l, 627 struct mbuf *m, u_int32_t begin, u_int32_t end) 628 { 629 char prepend[4]; 630 631 /* Stuff an MP header on the front of our packet and send it */ 632 633 if (mp->peer_is12bit) { 634 u_int16_t val; 635 636 val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq; 637 ua_htons(&val, prepend); 638 m = m_prepend(m, prepend, 2, 0); 639 } else { 640 u_int32_t val; 641 642 val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq; 643 ua_htonl(&val, prepend); 644 m = m_prepend(m, prepend, 4, 0); 645 } 646 if (log_IsKept(LogDEBUG)) 647 log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n", 648 mp->out.seq, m_length(m), l->name); 649 mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq); 650 651 if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { 652 log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); 653 return; 654 } 655 656 link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP); 657 } 658 659 int 660 mp_FillQueues(struct bundle *bundle) 661 { 662 struct mp *mp = &bundle->ncp.mp; 663 struct datalink *dl, *fdl; 664 size_t total, add, len; 665 int thislink, nlinks; 666 u_int32_t begin, end; 667 struct mbuf *m, *mo; 668 669 thislink = nlinks = 0; 670 for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) { 671 /* Include non-open links here as mp->out.link will stay more correct */ 672 if (!fdl) { 673 if (thislink == mp->out.link) 674 fdl = dl; 675 else 676 thislink++; 677 } 678 nlinks++; 679 } 680 681 if (!fdl) { 682 fdl = bundle->links; 683 if (!fdl) 684 return 0; 685 thislink = 0; 686 } 687 688 total = 0; 689 for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) { 690 if (!dl) { 691 dl = bundle->links; 692 thislink = 0; 693 } 694 695 if (dl->state != DATALINK_OPEN) 696 continue; 697 698 if (dl->physical->out) 699 /* this link has suffered a short write. Let it continue */ 700 continue; 701 702 add = link_QueueLen(&dl->physical->link); 703 if (add) { 704 /* this link has got stuff already queued. Let it continue */ 705 total += add; 706 continue; 707 } 708 709 if (!link_QueueLen(&mp->link)) { 710 struct datalink *other; 711 int mrutoosmall; 712 713 /* 714 * If there's only a single open link in our bundle and we haven't got 715 * MP level link compression, queue outbound traffic directly via that 716 * link's protocol stack rather than using the MP link. This results 717 * in the outbound traffic going out as PROTO_IP rather than PROTO_MP. 718 */ 719 for (other = dl->next; other; other = other->next) 720 if (other->state == DATALINK_OPEN) 721 break; 722 723 mrutoosmall = 0; 724 if (!other) { 725 if (dl->physical->link.lcp.his_mru < mp->peer_mrru) { 726 /* 727 * Actually, forget it. This test is done against the MRRU rather 728 * than the packet size so that we don't end up sending some data 729 * in MP fragments and some data in PROTO_IP packets. That's just 730 * too likely to upset some ppp implementations. 731 */ 732 mrutoosmall = 1; 733 other = dl; 734 } 735 } 736 737 if (!ip_PushPacket(other ? &mp->link : &dl->physical->link, bundle)) 738 /* Nothing else to send */ 739 break; 740 741 if (mrutoosmall) 742 log_Printf(LogDEBUG, "Don't send data as PROTO_IP, MRU < MRRU\n"); 743 else if (!other) 744 log_Printf(LogDEBUG, "Sending data as PROTO_IP, not PROTO_MP\n"); 745 746 if (!other) { 747 add = link_QueueLen(&dl->physical->link); 748 if (add) { 749 /* this link has got stuff already queued. Let it continue */ 750 total += add; 751 continue; 752 } 753 } 754 } 755 756 m = link_Dequeue(&mp->link); 757 if (m) { 758 len = m_length(m); 759 begin = 1; 760 end = 0; 761 762 while (!end) { 763 if (dl->state == DATALINK_OPEN) { 764 /* Write at most his_mru bytes to the physical link */ 765 if (len <= dl->physical->link.lcp.his_mru) { 766 mo = m; 767 end = 1; 768 m_settype(mo, MB_MPOUT); 769 } else { 770 /* It's > his_mru, chop the packet (`m') into bits */ 771 mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT); 772 len -= mo->m_len; 773 m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len); 774 } 775 mp_Output(mp, bundle, &dl->physical->link, mo, begin, end); 776 begin = 0; 777 } 778 779 if (!end) { 780 nlinks--; 781 dl = dl->next; 782 if (!dl) { 783 dl = bundle->links; 784 thislink = 0; 785 } else 786 thislink++; 787 } 788 } 789 } 790 } 791 mp->out.link = thislink; /* Start here next time */ 792 793 return total; 794 } 795 796 int 797 mp_SetDatalinkBandwidth(struct cmdargs const *arg) 798 { 799 int val; 800 801 if (arg->argc != arg->argn+1) 802 return -1; 803 804 val = atoi(arg->argv[arg->argn]); 805 if (val <= 0) { 806 log_Printf(LogWARN, "The link bandwidth must be greater than zero\n"); 807 return 1; 808 } 809 arg->cx->mp.bandwidth = val; 810 811 if (arg->cx->state == DATALINK_OPEN) 812 bundle_CalculateBandwidth(arg->bundle); 813 814 return 0; 815 } 816 817 int 818 mp_ShowStatus(struct cmdargs const *arg) 819 { 820 struct mp *mp = &arg->bundle->ncp.mp; 821 822 prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in"); 823 if (mp->active) { 824 struct mbuf *m, *lm; 825 int bufs = 0; 826 827 lm = NULL; 828 prompt_Printf(arg->prompt, "Socket: %s\n", 829 mp->server.socket.sun_path); 830 for (m = mp->inbufs; m; m = m->m_nextpkt) { 831 bufs++; 832 lm = m; 833 } 834 prompt_Printf(arg->prompt, "Pending frags: %d", bufs); 835 if (bufs) { 836 struct mp_header mh; 837 unsigned long first, last; 838 839 first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0; 840 last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0; 841 prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n", 842 first, last, (unsigned long)mp->seq.next_in, 843 (unsigned long)mp->seq.min_in); 844 prompt_Printf(arg->prompt, " First has %sbegin bit and " 845 "%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no "); 846 } 847 prompt_Printf(arg->prompt, "\n"); 848 } 849 850 prompt_Printf(arg->prompt, "\nMy Side:\n"); 851 if (mp->active) { 852 prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq); 853 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru); 854 prompt_Printf(arg->prompt, " Short Seq: %s\n", 855 mp->local_is12bit ? "on" : "off"); 856 } 857 prompt_Printf(arg->prompt, " Discriminator: %s\n", 858 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address, 859 mp->cfg.enddisc.len)); 860 861 prompt_Printf(arg->prompt, "\nHis Side:\n"); 862 if (mp->active) { 863 prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname); 864 prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in); 865 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru); 866 prompt_Printf(arg->prompt, " Short Seq: %s\n", 867 mp->peer_is12bit ? "on" : "off"); 868 } 869 prompt_Printf(arg->prompt, " Discriminator: %s\n", 870 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 871 mp->peer.enddisc.len)); 872 873 prompt_Printf(arg->prompt, "\nDefaults:\n"); 874 875 prompt_Printf(arg->prompt, " MRRU: "); 876 if (mp->cfg.mrru) 877 prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru); 878 else 879 prompt_Printf(arg->prompt, "disabled\n"); 880 prompt_Printf(arg->prompt, " Short Seq: %s\n", 881 command_ShowNegval(mp->cfg.shortseq)); 882 prompt_Printf(arg->prompt, " Discriminator: %s\n", 883 command_ShowNegval(mp->cfg.negenddisc)); 884 prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%," 885 " period %d secs\n", mp->cfg.autoload.min, 886 mp->cfg.autoload.max, mp->cfg.autoload.period); 887 888 return 0; 889 } 890 891 const char * 892 mp_Enddisc(u_char c, const char *address, int len) 893 { 894 static char result[100]; /* Used immediately after it's returned */ 895 int f, header; 896 897 switch (c) { 898 case ENDDISC_NULL: 899 sprintf(result, "Null Class"); 900 break; 901 902 case ENDDISC_LOCAL: 903 snprintf(result, sizeof result, "Local Addr: %.*s", len, address); 904 break; 905 906 case ENDDISC_IP: 907 if (len == 4) 908 snprintf(result, sizeof result, "IP %s", 909 inet_ntoa(*(const struct in_addr *)address)); 910 else 911 sprintf(result, "IP[%d] ???", len); 912 break; 913 914 case ENDDISC_MAC: 915 if (len == 6) { 916 const u_char *m = (const u_char *)address; 917 snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x", 918 m[0], m[1], m[2], m[3], m[4], m[5]); 919 } else 920 sprintf(result, "MAC[%d] ???", len); 921 break; 922 923 case ENDDISC_MAGIC: 924 sprintf(result, "Magic: 0x"); 925 header = strlen(result); 926 if (len > sizeof result - header - 1) 927 len = sizeof result - header - 1; 928 for (f = 0; f < len; f++) 929 sprintf(result + header + 2 * f, "%02x", address[f]); 930 break; 931 932 case ENDDISC_PSN: 933 snprintf(result, sizeof result, "PSN: %.*s", len, address); 934 break; 935 936 default: 937 sprintf(result, "%d: ", (int)c); 938 header = strlen(result); 939 if (len > sizeof result - header - 1) 940 len = sizeof result - header - 1; 941 for (f = 0; f < len; f++) 942 sprintf(result + header + 2 * f, "%02x", address[f]); 943 break; 944 } 945 return result; 946 } 947 948 int 949 mp_SetEnddisc(struct cmdargs const *arg) 950 { 951 struct mp *mp = &arg->bundle->ncp.mp; 952 struct in_addr addr; 953 954 switch (bundle_Phase(arg->bundle)) { 955 case PHASE_DEAD: 956 break; 957 case PHASE_ESTABLISH: 958 /* Make sure none of our links are DATALINK_LCP or greater */ 959 if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) { 960 log_Printf(LogWARN, "enddisc: Only changable before" 961 " LCP negotiations\n"); 962 return 1; 963 } 964 break; 965 default: 966 log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n"); 967 return 1; 968 } 969 970 if (arg->argc == arg->argn) { 971 mp->cfg.enddisc.class = 0; 972 *mp->cfg.enddisc.address = '\0'; 973 mp->cfg.enddisc.len = 0; 974 } else if (arg->argc > arg->argn) { 975 if (!strcasecmp(arg->argv[arg->argn], "label")) { 976 mp->cfg.enddisc.class = ENDDISC_LOCAL; 977 strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label); 978 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 979 } else if (!strcasecmp(arg->argv[arg->argn], "ip")) { 980 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 981 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 982 else 983 addr = arg->bundle->ncp.ipcp.my_ip; 984 memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr); 985 mp->cfg.enddisc.class = ENDDISC_IP; 986 mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr; 987 } else if (!strcasecmp(arg->argv[arg->argn], "mac")) { 988 struct sockaddr_dl hwaddr; 989 int s; 990 991 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 992 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 993 else 994 addr = arg->bundle->ncp.ipcp.my_ip; 995 996 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 997 if (s < 0) { 998 log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno)); 999 return 2; 1000 } 1001 if (get_ether_addr(s, addr, &hwaddr)) { 1002 mp->cfg.enddisc.class = ENDDISC_MAC; 1003 memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen, 1004 hwaddr.sdl_alen); 1005 mp->cfg.enddisc.len = hwaddr.sdl_alen; 1006 } else { 1007 log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n", 1008 inet_ntoa(addr)); 1009 close(s); 1010 return 4; 1011 } 1012 close(s); 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, const fd_set *fdset) 1079 { 1080 struct mpserver *s = descriptor2mpserver(d); 1081 1082 bundle_ReceiveDatalink(bundle, s->fd); 1083 } 1084 1085 static int 1086 mpserver_Write(struct fdescriptor *d, struct bundle *bundle, 1087 const fd_set *fdset) 1088 { 1089 /* We never want to write here ! */ 1090 log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n"); 1091 return 0; 1092 } 1093 1094 void 1095 mpserver_Init(struct mpserver *s) 1096 { 1097 s->desc.type = MPSERVER_DESCRIPTOR; 1098 s->desc.UpdateSet = mpserver_UpdateSet; 1099 s->desc.IsSet = mpserver_IsSet; 1100 s->desc.Read = mpserver_Read; 1101 s->desc.Write = mpserver_Write; 1102 s->send.dl = NULL; 1103 s->fd = -1; 1104 memset(&s->socket, '\0', sizeof s->socket); 1105 } 1106 1107 int 1108 mpserver_Open(struct mpserver *s, struct peerid *peer) 1109 { 1110 int f, l; 1111 mode_t mask; 1112 1113 if (s->fd != -1) { 1114 log_Printf(LogALERT, "Internal error ! mpserver already open\n"); 1115 mpserver_Close(s); 1116 } 1117 1118 l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-", 1119 _PATH_VARRUN, peer->authname, peer->enddisc.class); 1120 1121 for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) { 1122 snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l, 1123 "%02x", *(u_char *)(peer->enddisc.address+f)); 1124 l += 2; 1125 } 1126 1127 s->socket.sun_family = AF_LOCAL; 1128 s->socket.sun_len = sizeof s->socket; 1129 s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0); 1130 if (s->fd < 0) { 1131 log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno)); 1132 return MPSERVER_FAILED; 1133 } 1134 1135 setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket, 1136 sizeof s->socket); 1137 mask = umask(0177); 1138 1139 /* 1140 * Try to bind the socket. If we succeed we play server, if we fail 1141 * we connect() and hand the link off. 1142 */ 1143 1144 if (ID0bind_un(s->fd, &s->socket) < 0) { 1145 if (errno != EADDRINUSE) { 1146 log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n", 1147 s->socket.sun_path, strerror(errno)); 1148 umask(mask); 1149 close(s->fd); 1150 s->fd = -1; 1151 return MPSERVER_FAILED; 1152 } 1153 1154 /* So we're the sender */ 1155 umask(mask); 1156 if (ID0connect_un(s->fd, &s->socket) < 0) { 1157 log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n", 1158 s->socket.sun_path, strerror(errno)); 1159 if (errno == ECONNREFUSED) 1160 log_Printf(LogPHASE, " The previous server died badly !\n"); 1161 close(s->fd); 1162 s->fd = -1; 1163 return MPSERVER_FAILED; 1164 } 1165 1166 /* Donate our link to the other guy */ 1167 return MPSERVER_CONNECTED; 1168 } 1169 1170 return MPSERVER_LISTENING; 1171 } 1172 1173 void 1174 mpserver_Close(struct mpserver *s) 1175 { 1176 if (s->send.dl != NULL) { 1177 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 1178 s->send.dl = NULL; 1179 s->fd = -1; 1180 } else if (s->fd >= 0) { 1181 close(s->fd); 1182 if (ID0unlink(s->socket.sun_path) == -1) 1183 log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path, 1184 strerror(errno)); 1185 memset(&s->socket, '\0', sizeof s->socket); 1186 s->fd = -1; 1187 } 1188 } 1189 1190 void 1191 mp_LinkLost(struct mp *mp, struct datalink *dl) 1192 { 1193 if (mp->seq.min_in == dl->mp.seq) 1194 /* We've lost the link that's holding everything up ! */ 1195 mp_Assemble(mp, NULL, NULL); 1196 } 1197 1198 void 1199 mp_DeleteQueue(struct mp *mp) 1200 { 1201 link_DeleteQueue(&mp->link); 1202 } 1203