mp.c revision 64652
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: head/usr.sbin/ppp/mp.c 64652 2000-08-15 00:59:21Z brian $ 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 88void 89peerid_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 97int 98peerid_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 106static u_int32_t 107inc_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 118static int 119isbefore(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 132static int 133mp_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 160static void 161mp_LayerStart(void *v, struct fsm *fp) 162{ 163 /* The given FSM (ccp) is about to start up ! */ 164} 165 166static void 167mp_LayerUp(void *v, struct fsm *fp) 168{ 169 /* The given fsm (ccp) is now up */ 170} 171 172static void 173mp_LayerDown(void *v, struct fsm *fp) 174{ 175 /* The given FSM (ccp) has been told to come down */ 176} 177 178static void 179mp_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 186static void 187mp_UpDown(void *v) 188{ 189 struct mp *mp = (struct mp *)v; 190 int percent; 191 192 percent = mp->link.stats.total.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 202void 203mp_StopAutoloadTimer(struct mp *mp) 204{ 205 throughput_stop(&mp->link.stats.total); 206} 207 208void 209mp_CheckAutoloadTimer(struct mp *mp) 210{ 211 if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) { 212 throughput_destroy(&mp->link.stats.total); 213 throughput_init(&mp->link.stats.total, mp->cfg.autoload.period); 214 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 215 } 216 217 if (bundle_WantAutoloadTimer(mp->bundle)) 218 throughput_start(&mp->link.stats.total, "MP throughput", 1); 219 else 220 mp_StopAutoloadTimer(mp); 221} 222 223void 224mp_RestartAutoloadTimer(struct mp *mp) 225{ 226 if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) 227 mp_CheckAutoloadTimer(mp); 228 else 229 throughput_clear(&mp->link.stats.total, THROUGHPUT_OVERALL, NULL); 230} 231 232void 233mp_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.stats.total, mp->cfg.autoload.period); 254 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 255 mp->link.stats.parent = NULL; 256 mp->link.stats.gather = 0; /* Let the physical links gather stats */ 257 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 258 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 259 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 260 261 mp->fsmp.LayerStart = mp_LayerStart; 262 mp->fsmp.LayerUp = mp_LayerUp; 263 mp->fsmp.LayerDown = mp_LayerDown; 264 mp->fsmp.LayerFinish = mp_LayerFinish; 265 mp->fsmp.object = mp; 266 267 mpserver_Init(&mp->server); 268 269 mp->cfg.mrru = 0; 270 mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED; 271 mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED; 272 mp->cfg.enddisc.class = 0; 273 *mp->cfg.enddisc.address = '\0'; 274 mp->cfg.enddisc.len = 0; 275 276 lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL); 277 ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp); 278 279 link_EmptyStack(&mp->link); 280 link_Stack(&mp->link, &protolayer); 281 link_Stack(&mp->link, &ccplayer); 282 link_Stack(&mp->link, &vjlayer); 283#ifndef NONAT 284 link_Stack(&mp->link, &natlayer); 285#endif 286} 287 288int 289mp_Up(struct mp *mp, struct datalink *dl) 290{ 291 struct lcp *lcp = &dl->physical->link.lcp; 292 293 if (mp->active) { 294 /* We're adding a link - do a last validation on our parameters */ 295 if (!peerid_Equal(&dl->peer, &mp->peer)) { 296 log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name); 297 log_Printf(LogPHASE, " Attached to peer %s/%s\n", mp->peer.authname, 298 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 299 mp->peer.enddisc.len)); 300 log_Printf(LogPHASE, " New link is peer %s/%s\n", dl->peer.authname, 301 mp_Enddisc(dl->peer.enddisc.class, dl->peer.enddisc.address, 302 dl->peer.enddisc.len)); 303 return MP_FAILED; 304 } 305 if (mp->local_mrru != lcp->want_mrru || 306 mp->peer_mrru != lcp->his_mrru || 307 mp->local_is12bit != lcp->want_shortseq || 308 mp->peer_is12bit != lcp->his_shortseq) { 309 log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n", 310 dl->name); 311 return MP_FAILED; 312 } 313 return MP_ADDED; 314 } else { 315 /* First link in multilink mode */ 316 317 mp->local_mrru = lcp->want_mrru; 318 mp->peer_mrru = lcp->his_mrru; 319 mp->local_is12bit = lcp->want_shortseq; 320 mp->peer_is12bit = lcp->his_shortseq; 321 mp->peer = dl->peer; 322 323 throughput_destroy(&mp->link.stats.total); 324 throughput_init(&mp->link.stats.total, mp->cfg.autoload.period); 325 throughput_callback(&mp->link.stats.total, mp_UpDown, mp); 326 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 327 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 328 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 329 330 /* Tell the link who it belongs to */ 331 dl->physical->link.stats.parent = &mp->link.stats.total; 332 333 mp->out.seq = 0; 334 mp->out.link = 0; 335 mp->seq.min_in = 0; 336 mp->seq.next_in = 0; 337 338 /* 339 * Now we create our server socket. 340 * If it already exists, join it. Otherwise, create and own it 341 */ 342 switch (mpserver_Open(&mp->server, &mp->peer)) { 343 case MPSERVER_CONNECTED: 344 log_Printf(LogPHASE, "mp: Transfer link on %s\n", 345 mp->server.socket.sun_path); 346 mp->server.send.dl = dl; /* Defer 'till it's safe to send */ 347 return MP_LINKSENT; 348 case MPSERVER_FAILED: 349 return MP_FAILED; 350 case MPSERVER_LISTENING: 351 log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path); 352 log_Printf(LogPHASE, " First link: %s\n", dl->name); 353 354 /* Re-point our IPCP layer at our MP link */ 355 ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link); 356 357 /* Our lcp's already up 'cos of the NULL parent */ 358 if (ccp_SetOpenMode(&mp->link.ccp)) { 359 fsm_Up(&mp->link.ccp.fsm); 360 fsm_Open(&mp->link.ccp.fsm); 361 } 362 363 mp->active = 1; 364 break; 365 } 366 } 367 368 return MP_UP; 369} 370 371void 372mp_Down(struct mp *mp) 373{ 374 if (mp->active) { 375 struct mbuf *next; 376 377 /* Stop that ! */ 378 mp_StopAutoloadTimer(mp); 379 380 /* Don't want any more of these */ 381 mpserver_Close(&mp->server); 382 383 /* CCP goes down with a bang */ 384 fsm2initial(&mp->link.ccp.fsm); 385 386 /* Received fragments go in the bit-bucket */ 387 while (mp->inbufs) { 388 next = mp->inbufs->m_nextpkt; 389 m_freem(mp->inbufs); 390 mp->inbufs = next; 391 } 392 393 peerid_Init(&mp->peer); 394 mp->active = 0; 395 } 396} 397 398void 399mp_linkInit(struct mp_link *mplink) 400{ 401 mplink->seq = 0; 402 mplink->bandwidth = 0; 403} 404 405static void 406mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p) 407{ 408 struct mp_header mh, h; 409 struct mbuf *q, *last; 410 int32_t seq; 411 412 /* 413 * When `m' and `p' are NULL, it means our oldest link has gone down. 414 * We want to determine a new min, and process any intermediate stuff 415 * as normal 416 */ 417 418 if (m && mp_ReadHeader(mp, m, &mh) == 0) { 419 m_freem(m); 420 return; 421 } 422 423 if (p) { 424 seq = p->dl->mp.seq; 425 p->dl->mp.seq = mh.seq; 426 } else 427 seq = mp->seq.min_in; 428 429 if (mp->seq.min_in == seq) { 430 /* 431 * We've received new data on the link that has our min (oldest) seq. 432 * Figure out which link now has the smallest (oldest) seq. 433 */ 434 struct datalink *dl; 435 436 mp->seq.min_in = (u_int32_t)-1; 437 for (dl = mp->bundle->links; dl; dl = dl->next) 438 if (dl->state == DATALINK_OPEN && 439 (mp->seq.min_in == -1 || 440 isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in))) 441 mp->seq.min_in = dl->mp.seq; 442 } 443 444 /* 445 * Now process as many of our fragments as we can, adding our new 446 * fragment in as we go, and ordering with the oldest at the top of 447 * the queue. 448 */ 449 450 last = NULL; 451 seq = mp->seq.next_in; 452 q = mp->inbufs; 453 while (q || m) { 454 if (!q) { 455 if (last) 456 last->m_nextpkt = m; 457 else 458 mp->inbufs = m; 459 q = m; 460 m = NULL; 461 h = mh; 462 } else { 463 mp_ReadHeader(mp, q, &h); 464 465 if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) { 466 /* Our received fragment fits in before this one, so link it in */ 467 if (last) 468 last->m_nextpkt = m; 469 else 470 mp->inbufs = m; 471 m->m_nextpkt = q; 472 q = m; 473 h = mh; 474 m = NULL; 475 } 476 } 477 478 if (h.seq != seq) { 479 /* we're missing something :-( */ 480 if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) { 481 /* we're never gonna get it */ 482 struct mbuf *next; 483 484 /* Zap all older fragments */ 485 while (mp->inbufs != q) { 486 log_Printf(LogDEBUG, "Drop frag\n"); 487 next = mp->inbufs->m_nextpkt; 488 m_freem(mp->inbufs); 489 mp->inbufs = next; 490 } 491 492 /* 493 * Zap everything until the next `end' fragment OR just before 494 * the next `begin' fragment OR 'till seq.min_in - whichever 495 * comes first. 496 */ 497 do { 498 mp_ReadHeader(mp, mp->inbufs, &h); 499 if (h.begin) { 500 /* We might be able to process this ! */ 501 h.seq--; /* We're gonna look for fragment with h.seq+1 */ 502 break; 503 } 504 next = mp->inbufs->m_nextpkt; 505 log_Printf(LogDEBUG, "Drop frag %u\n", h.seq); 506 m_freem(mp->inbufs); 507 mp->inbufs = next; 508 } while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in, 509 h.seq) || h.end)); 510 511 /* 512 * Continue processing things from here. 513 * This deals with the possibility that we received a fragment 514 * on the slowest link that invalidates some of our data (because 515 * of the hole at `q'), but where there are subsequent `whole' 516 * packets that have already been received. 517 */ 518 519 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 520 last = NULL; 521 q = mp->inbufs; 522 } else 523 /* we may still receive the missing fragment */ 524 break; 525 } else if (h.end) { 526 /* We've got something, reassemble */ 527 struct mbuf **frag = &q; 528 int len; 529 u_long first = -1; 530 531 do { 532 *frag = mp->inbufs; 533 mp->inbufs = mp->inbufs->m_nextpkt; 534 len = mp_ReadHeader(mp, *frag, &h); 535 if (first == -1) 536 first = h.seq; 537 (*frag)->m_offset += len; 538 (*frag)->m_len -= len; 539 (*frag)->m_nextpkt = NULL; 540 if (frag == &q && !h.begin) { 541 log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n", 542 (u_long)h.seq); 543 m_freem(q); 544 q = NULL; 545 } else if (frag != &q && h.begin) { 546 log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n", 547 (u_long)h.seq - 1); 548 /* 549 * Stuff our fragment back at the front of the queue and zap 550 * our half-assembed packet. 551 */ 552 (*frag)->m_nextpkt = mp->inbufs; 553 mp->inbufs = *frag; 554 *frag = NULL; 555 m_freem(q); 556 q = NULL; 557 frag = &q; 558 h.end = 0; /* just in case it's a whole packet */ 559 } else 560 do 561 frag = &(*frag)->m_next; 562 while (*frag != NULL); 563 } while (!h.end); 564 565 if (q) { 566 q = m_pullup(q); 567 log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n", 568 first, (u_long)h.seq, m_length(q)); 569 link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle); 570 m_freem(q); 571 } 572 573 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 574 last = NULL; 575 q = mp->inbufs; 576 } else { 577 /* Look for the next fragment */ 578 seq = inc_seq(mp->local_is12bit, seq); 579 last = q; 580 q = q->m_nextpkt; 581 } 582 } 583 584 if (m) { 585 /* We still have to find a home for our new fragment */ 586 last = NULL; 587 for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) { 588 mp_ReadHeader(mp, q, &h); 589 if (isbefore(mp->local_is12bit, mh.seq, h.seq)) 590 break; 591 } 592 /* Our received fragment fits in here */ 593 if (last) 594 last->m_nextpkt = m; 595 else 596 mp->inbufs = m; 597 m->m_nextpkt = q; 598 } 599} 600 601struct mbuf * 602mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 603{ 604 struct physical *p = link2physical(l); 605 606 if (!bundle->ncp.mp.active) 607 /* Let someone else deal with it ! */ 608 return bp; 609 610 if (p == NULL) { 611 log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n"); 612 m_freem(bp); 613 } else { 614 m_settype(bp, MB_MPIN); 615 mp_Assemble(&bundle->ncp.mp, bp, p); 616 } 617 618 return NULL; 619} 620 621static void 622mp_Output(struct mp *mp, struct bundle *bundle, struct link *l, 623 struct mbuf *m, u_int32_t begin, u_int32_t end) 624{ 625 char prepend[4]; 626 627 /* Stuff an MP header on the front of our packet and send it */ 628 629 if (mp->peer_is12bit) { 630 u_int16_t val; 631 632 val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq; 633 ua_htons(&val, prepend); 634 m = m_prepend(m, prepend, 2, 0); 635 } else { 636 u_int32_t val; 637 638 val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq; 639 ua_htonl(&val, prepend); 640 m = m_prepend(m, prepend, 4, 0); 641 } 642 if (log_IsKept(LogDEBUG)) 643 log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n", 644 mp->out.seq, m_length(m), l->name); 645 mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq); 646 647 link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP); 648} 649 650int 651mp_FillQueues(struct bundle *bundle) 652{ 653 struct mp *mp = &bundle->ncp.mp; 654 struct datalink *dl, *fdl; 655 size_t total, add, len; 656 int thislink, nlinks; 657 u_int32_t begin, end; 658 struct mbuf *m, *mo; 659 660 thislink = nlinks = 0; 661 for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) { 662 /* Include non-open links here as mp->out.link will stay more correct */ 663 if (!fdl) { 664 if (thislink == mp->out.link) 665 fdl = dl; 666 else 667 thislink++; 668 } 669 nlinks++; 670 } 671 672 if (!fdl) { 673 fdl = bundle->links; 674 if (!fdl) 675 return 0; 676 thislink = 0; 677 } 678 679 total = 0; 680 for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) { 681 if (!dl) { 682 dl = bundle->links; 683 thislink = 0; 684 } 685 686 if (dl->state != DATALINK_OPEN) 687 continue; 688 689 if (dl->physical->out) 690 /* this link has suffered a short write. Let it continue */ 691 continue; 692 693 add = link_QueueLen(&dl->physical->link); 694 total += add; 695 if (add) 696 /* this link has got stuff already queued. Let it continue */ 697 continue; 698 699 if (!link_QueueLen(&mp->link) && !ip_PushPacket(&mp->link, bundle)) 700 /* Nothing else to send */ 701 break; 702 703 m = link_Dequeue(&mp->link); 704 len = m_length(m); 705 begin = 1; 706 end = 0; 707 708 while (!end) { 709 if (dl->state == DATALINK_OPEN) { 710 /* Write at most his_mru bytes to the physical link */ 711 if (len <= dl->physical->link.lcp.his_mru) { 712 mo = m; 713 end = 1; 714 m_settype(mo, MB_MPOUT); 715 } else { 716 /* It's > his_mru, chop the packet (`m') into bits */ 717 mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT); 718 len -= mo->m_len; 719 m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len); 720 } 721 mp_Output(mp, bundle, &dl->physical->link, mo, begin, end); 722 begin = 0; 723 } 724 725 if (!end) { 726 nlinks--; 727 dl = dl->next; 728 if (!dl) { 729 dl = bundle->links; 730 thislink = 0; 731 } else 732 thislink++; 733 } 734 } 735 } 736 mp->out.link = thislink; /* Start here next time */ 737 738 return total; 739} 740 741int 742mp_SetDatalinkBandwidth(struct cmdargs const *arg) 743{ 744 int val; 745 746 if (arg->argc != arg->argn+1) 747 return -1; 748 749 val = atoi(arg->argv[arg->argn]); 750 if (val <= 0) { 751 log_Printf(LogWARN, "The link bandwidth must be greater than zero\n"); 752 return 1; 753 } 754 arg->cx->mp.bandwidth = val; 755 756 if (arg->cx->state == DATALINK_OPEN) 757 bundle_CalculateBandwidth(arg->bundle); 758 759 return 0; 760} 761 762int 763mp_ShowStatus(struct cmdargs const *arg) 764{ 765 struct mp *mp = &arg->bundle->ncp.mp; 766 767 prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in"); 768 if (mp->active) { 769 struct mbuf *m, *lm; 770 int bufs = 0; 771 772 lm = NULL; 773 prompt_Printf(arg->prompt, "Socket: %s\n", 774 mp->server.socket.sun_path); 775 for (m = mp->inbufs; m; m = m->m_nextpkt) { 776 bufs++; 777 lm = m; 778 } 779 prompt_Printf(arg->prompt, "Pending frags: %d", bufs); 780 if (bufs) { 781 struct mp_header mh; 782 unsigned long first, last; 783 784 first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0; 785 last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0; 786 prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n", 787 first, last, (unsigned long)mp->seq.next_in, 788 (unsigned long)mp->seq.min_in); 789 prompt_Printf(arg->prompt, " First has %sbegin bit and " 790 "%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no "); 791 } 792 prompt_Printf(arg->prompt, "\n"); 793 } 794 795 prompt_Printf(arg->prompt, "\nMy Side:\n"); 796 if (mp->active) { 797 prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq); 798 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru); 799 prompt_Printf(arg->prompt, " Short Seq: %s\n", 800 mp->local_is12bit ? "on" : "off"); 801 } 802 prompt_Printf(arg->prompt, " Discriminator: %s\n", 803 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address, 804 mp->cfg.enddisc.len)); 805 806 prompt_Printf(arg->prompt, "\nHis Side:\n"); 807 if (mp->active) { 808 prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname); 809 prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in); 810 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru); 811 prompt_Printf(arg->prompt, " Short Seq: %s\n", 812 mp->peer_is12bit ? "on" : "off"); 813 } 814 prompt_Printf(arg->prompt, " Discriminator: %s\n", 815 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 816 mp->peer.enddisc.len)); 817 818 prompt_Printf(arg->prompt, "\nDefaults:\n"); 819 820 prompt_Printf(arg->prompt, " MRRU: "); 821 if (mp->cfg.mrru) 822 prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru); 823 else 824 prompt_Printf(arg->prompt, "disabled\n"); 825 prompt_Printf(arg->prompt, " Short Seq: %s\n", 826 command_ShowNegval(mp->cfg.shortseq)); 827 prompt_Printf(arg->prompt, " Discriminator: %s\n", 828 command_ShowNegval(mp->cfg.negenddisc)); 829 prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%," 830 " period %d secs\n", mp->cfg.autoload.min, 831 mp->cfg.autoload.max, mp->cfg.autoload.period); 832 833 return 0; 834} 835 836const char * 837mp_Enddisc(u_char c, const char *address, int len) 838{ 839 static char result[100]; /* Used immediately after it's returned */ 840 int f, header; 841 842 switch (c) { 843 case ENDDISC_NULL: 844 sprintf(result, "Null Class"); 845 break; 846 847 case ENDDISC_LOCAL: 848 snprintf(result, sizeof result, "Local Addr: %.*s", len, address); 849 break; 850 851 case ENDDISC_IP: 852 if (len == 4) 853 snprintf(result, sizeof result, "IP %s", 854 inet_ntoa(*(const struct in_addr *)address)); 855 else 856 sprintf(result, "IP[%d] ???", len); 857 break; 858 859 case ENDDISC_MAC: 860 if (len == 6) { 861 const u_char *m = (const u_char *)address; 862 snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x", 863 m[0], m[1], m[2], m[3], m[4], m[5]); 864 } else 865 sprintf(result, "MAC[%d] ???", len); 866 break; 867 868 case ENDDISC_MAGIC: 869 sprintf(result, "Magic: 0x"); 870 header = strlen(result); 871 if (len > sizeof result - header - 1) 872 len = sizeof result - header - 1; 873 for (f = 0; f < len; f++) 874 sprintf(result + header + 2 * f, "%02x", address[f]); 875 break; 876 877 case ENDDISC_PSN: 878 snprintf(result, sizeof result, "PSN: %.*s", len, address); 879 break; 880 881 default: 882 sprintf(result, "%d: ", (int)c); 883 header = strlen(result); 884 if (len > sizeof result - header - 1) 885 len = sizeof result - header - 1; 886 for (f = 0; f < len; f++) 887 sprintf(result + header + 2 * f, "%02x", address[f]); 888 break; 889 } 890 return result; 891} 892 893int 894mp_SetEnddisc(struct cmdargs const *arg) 895{ 896 struct mp *mp = &arg->bundle->ncp.mp; 897 struct in_addr addr; 898 899 switch (bundle_Phase(arg->bundle)) { 900 case PHASE_DEAD: 901 break; 902 case PHASE_ESTABLISH: 903 /* Make sure none of our links are DATALINK_LCP or greater */ 904 if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) { 905 log_Printf(LogWARN, "enddisc: Only changable before" 906 " LCP negotiations\n"); 907 return 1; 908 } 909 break; 910 default: 911 log_Printf(LogWARN, "enddisc: Only changable at phase DEAD/ESTABLISH\n"); 912 return 1; 913 } 914 915 if (arg->argc == arg->argn) { 916 mp->cfg.enddisc.class = 0; 917 *mp->cfg.enddisc.address = '\0'; 918 mp->cfg.enddisc.len = 0; 919 } else if (arg->argc > arg->argn) { 920 if (!strcasecmp(arg->argv[arg->argn], "label")) { 921 mp->cfg.enddisc.class = ENDDISC_LOCAL; 922 strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label); 923 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 924 } else if (!strcasecmp(arg->argv[arg->argn], "ip")) { 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 memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr); 930 mp->cfg.enddisc.class = ENDDISC_IP; 931 mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr; 932 } else if (!strcasecmp(arg->argv[arg->argn], "mac")) { 933 struct sockaddr_dl hwaddr; 934 int s; 935 936 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 937 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 938 else 939 addr = arg->bundle->ncp.ipcp.my_ip; 940 941 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 942 if (s < 0) { 943 log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno)); 944 return 2; 945 } 946 if (get_ether_addr(s, addr, &hwaddr)) { 947 mp->cfg.enddisc.class = ENDDISC_MAC; 948 memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen, 949 hwaddr.sdl_alen); 950 mp->cfg.enddisc.len = hwaddr.sdl_alen; 951 } else { 952 log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n", 953 inet_ntoa(addr)); 954 close(s); 955 return 4; 956 } 957 close(s); 958 } else if (!strcasecmp(arg->argv[arg->argn], "magic")) { 959 int f; 960 961 randinit(); 962 for (f = 0; f < 20; f += sizeof(long)) 963 *(long *)(mp->cfg.enddisc.address + f) = random(); 964 mp->cfg.enddisc.class = ENDDISC_MAGIC; 965 mp->cfg.enddisc.len = 20; 966 } else if (!strcasecmp(arg->argv[arg->argn], "psn")) { 967 if (arg->argc > arg->argn+1) { 968 mp->cfg.enddisc.class = ENDDISC_PSN; 969 strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]); 970 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 971 } else { 972 log_Printf(LogWARN, "PSN endpoint requires additional data\n"); 973 return 5; 974 } 975 } else { 976 log_Printf(LogWARN, "%s: Unrecognised endpoint type\n", 977 arg->argv[arg->argn]); 978 return 6; 979 } 980 } 981 982 return 0; 983} 984 985static int 986mpserver_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, 987 int *n) 988{ 989 struct mpserver *s = descriptor2mpserver(d); 990 int result; 991 992 result = 0; 993 if (s->send.dl != NULL) { 994 /* We've connect()ed */ 995 if (!link_QueueLen(&s->send.dl->physical->link) && 996 !s->send.dl->physical->out) { 997 /* Only send if we've transmitted all our data (i.e. the ConfigAck) */ 998 result -= datalink_RemoveFromSet(s->send.dl, r, w, e); 999 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 1000 s->send.dl = NULL; 1001 s->fd = -1; 1002 } else 1003 /* Never read from a datalink that's on death row ! */ 1004 result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL); 1005 } else if (r && s->fd >= 0) { 1006 if (*n < s->fd + 1) 1007 *n = s->fd + 1; 1008 FD_SET(s->fd, r); 1009 log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd); 1010 result++; 1011 } 1012 return result; 1013} 1014 1015static int 1016mpserver_IsSet(struct fdescriptor *d, const fd_set *fdset) 1017{ 1018 struct mpserver *s = descriptor2mpserver(d); 1019 return s->fd >= 0 && FD_ISSET(s->fd, fdset); 1020} 1021 1022static void 1023mpserver_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1024{ 1025 struct mpserver *s = descriptor2mpserver(d); 1026 1027 bundle_ReceiveDatalink(bundle, s->fd); 1028} 1029 1030static int 1031mpserver_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 1032{ 1033 /* We never want to write here ! */ 1034 log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n"); 1035 return 0; 1036} 1037 1038void 1039mpserver_Init(struct mpserver *s) 1040{ 1041 s->desc.type = MPSERVER_DESCRIPTOR; 1042 s->desc.UpdateSet = mpserver_UpdateSet; 1043 s->desc.IsSet = mpserver_IsSet; 1044 s->desc.Read = mpserver_Read; 1045 s->desc.Write = mpserver_Write; 1046 s->send.dl = NULL; 1047 s->fd = -1; 1048 memset(&s->socket, '\0', sizeof s->socket); 1049} 1050 1051int 1052mpserver_Open(struct mpserver *s, struct peerid *peer) 1053{ 1054 int f, l; 1055 mode_t mask; 1056 1057 if (s->fd != -1) { 1058 log_Printf(LogALERT, "Internal error ! mpserver already open\n"); 1059 mpserver_Close(s); 1060 } 1061 1062 l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-", 1063 _PATH_VARRUN, peer->authname, peer->enddisc.class); 1064 1065 for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) { 1066 snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l, 1067 "%02x", *(u_char *)(peer->enddisc.address+f)); 1068 l += 2; 1069 } 1070 1071 s->socket.sun_family = AF_LOCAL; 1072 s->socket.sun_len = sizeof s->socket; 1073 s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0); 1074 if (s->fd < 0) { 1075 log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno)); 1076 return MPSERVER_FAILED; 1077 } 1078 1079 setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket, 1080 sizeof s->socket); 1081 mask = umask(0177); 1082 1083 /* 1084 * Try to bind the socket. If we succeed we play server, if we fail 1085 * we connect() and hand the link off. 1086 */ 1087 1088 if (ID0bind_un(s->fd, &s->socket) < 0) { 1089 if (errno != EADDRINUSE) { 1090 log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n", 1091 s->socket.sun_path, strerror(errno)); 1092 umask(mask); 1093 close(s->fd); 1094 s->fd = -1; 1095 return MPSERVER_FAILED; 1096 } 1097 1098 /* So we're the sender */ 1099 umask(mask); 1100 if (ID0connect_un(s->fd, &s->socket) < 0) { 1101 log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n", 1102 s->socket.sun_path, strerror(errno)); 1103 if (errno == ECONNREFUSED) 1104 log_Printf(LogPHASE, " The previous server died badly !\n"); 1105 close(s->fd); 1106 s->fd = -1; 1107 return MPSERVER_FAILED; 1108 } 1109 1110 /* Donate our link to the other guy */ 1111 return MPSERVER_CONNECTED; 1112 } 1113 1114 return MPSERVER_LISTENING; 1115} 1116 1117void 1118mpserver_Close(struct mpserver *s) 1119{ 1120 if (s->send.dl != NULL) { 1121 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 1122 s->send.dl = NULL; 1123 s->fd = -1; 1124 } else if (s->fd >= 0) { 1125 close(s->fd); 1126 if (ID0unlink(s->socket.sun_path) == -1) 1127 log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path, 1128 strerror(errno)); 1129 memset(&s->socket, '\0', sizeof s->socket); 1130 s->fd = -1; 1131 } 1132} 1133 1134void 1135mp_LinkLost(struct mp *mp, struct datalink *dl) 1136{ 1137 if (mp->seq.min_in == dl->mp.seq) 1138 /* We've lost the link that's holding everything up ! */ 1139 mp_Assemble(mp, NULL, NULL); 1140} 1141 1142void 1143mp_DeleteQueue(struct mp *mp) 1144{ 1145 link_DeleteQueue(&mp->link); 1146} 1147