mp.c revision 37141
1174922Srwatson/*- 2174922Srwatson * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org> 3174922Srwatson * All rights reserved. 4174922Srwatson * 5174922Srwatson * Redistribution and use in source and binary forms, with or without 6174922Srwatson * modification, are permitted provided that the following conditions 7174922Srwatson * are met: 8174922Srwatson * 1. Redistributions of source code must retain the above copyright 9174922Srwatson * notice, this list of conditions and the following disclaimer. 10174922Srwatson * 2. Redistributions in binary form must reproduce the above copyright 11174922Srwatson * notice, this list of conditions and the following disclaimer in the 12174922Srwatson * documentation and/or other materials provided with the distribution. 13174922Srwatson * 14174922Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15174922Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16174922Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17174922Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18174922Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19174922Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20174922Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21174922Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22174922Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23174922Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24174922Srwatson * SUCH DAMAGE. 25174922Srwatson * 26174922Srwatson * $Id: mp.c,v 1.10 1998/06/20 00:19:42 brian Exp $ 27174922Srwatson */ 28174922Srwatson 29174922Srwatson#include <sys/types.h> 30186478Strhodes#include <netinet/in.h> 31209031Suqs#include <netinet/in_systm.h> 32174922Srwatson#include <netinet/ip.h> 33174922Srwatson#include <arpa/inet.h> 34174922Srwatson#include <net/if_dl.h> 35174922Srwatson#include <sys/socket.h> 36174922Srwatson#include <sys/un.h> 37242495Sjoel 38174922Srwatson#include <errno.h> 39242440Salfred#include <paths.h> 40242495Sjoel#include <stdlib.h> 41242424Salfred#include <stdio.h> 42174922Srwatson#include <string.h> 43174922Srwatson#include <sys/stat.h> 44174922Srwatson#include <termios.h> 45174922Srwatson#include <unistd.h> 46174922Srwatson 47174922Srwatson#include "defs.h" 48174922Srwatson#include "command.h" 49174922Srwatson#include "mbuf.h" 50174922Srwatson#include "log.h" 51174922Srwatson#include "timer.h" 52174922Srwatson#include "fsm.h" 53174922Srwatson#include "iplist.h" 54178379Srwatson#include "throughput.h" 55174922Srwatson#include "slcompress.h" 56174922Srwatson#include "ipcp.h" 57174922Srwatson#include "auth.h" 58174922Srwatson#include "lcp.h" 59174922Srwatson#include "lqr.h" 60174922Srwatson#include "hdlc.h" 61174922Srwatson#include "async.h" 62174922Srwatson#include "ccp.h" 63174922Srwatson#include "link.h" 64174922Srwatson#include "descriptor.h" 65174922Srwatson#include "physical.h" 66174922Srwatson#include "chat.h" 67174922Srwatson#include "lcpproto.h" 68174922Srwatson#include "filter.h" 69174922Srwatson#include "mp.h" 70174922Srwatson#include "chap.h" 71174922Srwatson#include "datalink.h" 72174922Srwatson#include "bundle.h" 73178379Srwatson#include "ip.h" 74174922Srwatson#include "prompt.h" 75174922Srwatson#include "id.h" 76174922Srwatson#include "arp.h" 77174922Srwatson 78174922Srwatsonvoid 79174922Srwatsonpeerid_Init(struct peerid *peer) 80205076Suqs{ 81174922Srwatson peer->enddisc.class = 0; 82174922Srwatson *peer->enddisc.address = '\0'; 83174922Srwatson peer->enddisc.len = 0; 84174922Srwatson *peer->authname = '\0'; 85174922Srwatson} 86174922Srwatson 87174922Srwatsonint 88174922Srwatsonpeerid_Equal(const struct peerid *p1, const struct peerid *p2) 89174922Srwatson{ 90174922Srwatson return !strcmp(p1->authname, p2->authname) && 91174922Srwatson p1->enddisc.class == p2->enddisc.class && 92174922Srwatson p1->enddisc.len == p2->enddisc.len && 93174922Srwatson !memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len); 94174922Srwatson} 95174922Srwatson 96174922Srwatsonstatic u_int32_t 97174922Srwatsoninc_seq(unsigned is12bit, u_int32_t seq) 98174922Srwatson{ 99175136Sbrueffer seq++; 100174922Srwatson if (is12bit) { 101174922Srwatson if (seq & 0xfffff000) 102174922Srwatson seq = 0; 103174922Srwatson } else if (seq & 0xff000000) 104190950Skientzle seq = 0; 105174922Srwatson return seq; 106174922Srwatson} 107174922Srwatson 108174922Srwatsonstatic int 109174922Srwatsonisbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2) 110174922Srwatson{ 111174922Srwatson u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200; 112174922Srwatson 113174922Srwatson if (seq1 > max) { 114174922Srwatson if (seq2 < 0x200 || seq2 > seq1) 115174922Srwatson return 1; 116178379Srwatson } else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2) 117174922Srwatson return 1; 118174922Srwatson 119174922Srwatson return 0; 120174924Srwatson} 121242495Sjoel 122242495Sjoelstatic int 123242424Salfredmp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header) 124242428Sjoel{ 125242424Salfred if (mp->local_is12bit) { 126174922Srwatson header->seq = ntohs(*(u_int16_t *)MBUF_CTOP(m)); 127174922Srwatson if (header->seq & 0x3000) { 128178379Srwatson log_Printf(LogWARN, "Oops - MP header without required zero bits\n"); 129174922Srwatson return 0; 130174922Srwatson } 131174922Srwatson header->begin = header->seq & 0x8000 ? 1 : 0; 132174922Srwatson header->end = header->seq & 0x4000 ? 1 : 0; 133174922Srwatson header->seq &= 0x0fff; 134174922Srwatson return 2; 135174922Srwatson } else { 136174922Srwatson header->seq = ntohl(*(u_int32_t *)MBUF_CTOP(m)); 137174922Srwatson if (header->seq & 0x3f000000) { 138174922Srwatson log_Printf(LogWARN, "Oops - MP header without required zero bits\n"); 139242424Salfred return 0; 140242424Salfred } 141242424Salfred header->begin = header->seq & 0x80000000 ? 1 : 0; 142242424Salfred header->end = header->seq & 0x40000000 ? 1 : 0; 143242424Salfred header->seq &= 0x00ffffff; 144242428Sjoel return 4; 145242495Sjoel } 146242495Sjoel} 147242424Salfred 148242424Salfredstatic void 149242427Sjoelmp_LayerStart(void *v, struct fsm *fp) 150242424Salfred{ 151242424Salfred /* The given FSM (ccp) is about to start up ! */ 152242424Salfred} 153242424Salfred 154242424Salfredstatic void 155242424Salfredmp_LayerUp(void *v, struct fsm *fp) 156174922Srwatson{ 157174922Srwatson /* The given fsm (ccp) is now up */ 158174922Srwatson} 159174922Srwatson 160174922Srwatsonstatic void 161174922Srwatsonmp_LayerDown(void *v, struct fsm *fp) 162174922Srwatson{ 163174922Srwatson /* The given FSM (ccp) has been told to come down */ 164174924Srwatson} 165197111Sdes 166174922Srwatsonstatic void 167174922Srwatsonmp_LayerFinish(void *v, struct fsm *fp) 168174922Srwatson{ 169174922Srwatson /* The given fsm (ccp) is now down */ 170174922Srwatson if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE) 171174922Srwatson fsm_Open(fp); /* CCP goes to ST_STOPPED */ 172174922Srwatson} 173174922Srwatson 174174922Srwatsonvoid 175186478Strhodesmp_Init(struct mp *mp, struct bundle *bundle) 176186478Strhodes{ 177186478Strhodes mp->peer_is12bit = mp->local_is12bit = 0; 178186478Strhodes mp->peer_mrru = mp->local_mrru = 0; 179174922Srwatson 180190950Skientzle peerid_Init(&mp->peer); 181174922Srwatson 182174922Srwatson mp->out.seq = 0; 183186478Strhodes mp->out.link = 0; 184174922Srwatson mp->seq.min_in = 0; 185174922Srwatson mp->seq.next_in = 0; 186174922Srwatson mp->inbufs = NULL; 187181238Srwatson mp->bundle = bundle; 188181238Srwatson 189181238Srwatson mp->link.type = MP_LINK; 190181238Srwatson mp->link.name = "mp"; 191181238Srwatson mp->link.len = sizeof *mp; 192174922Srwatson 193174922Srwatson throughput_init(&mp->link.throughput); 194174922Srwatson memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 195174922Srwatson memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 196174922Srwatson memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 197 198 mp->fsmp.LayerStart = mp_LayerStart; 199 mp->fsmp.LayerUp = mp_LayerUp; 200 mp->fsmp.LayerDown = mp_LayerDown; 201 mp->fsmp.LayerFinish = mp_LayerFinish; 202 mp->fsmp.object = mp; 203 204 mpserver_Init(&mp->server); 205 206 mp->cfg.mrru = 0; 207 mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED; 208 mp->cfg.enddisc.class = 0; 209 *mp->cfg.enddisc.address = '\0'; 210 mp->cfg.enddisc.len = 0; 211 212 lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL); 213 ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp); 214} 215 216int 217mp_Up(struct mp *mp, struct datalink *dl) 218{ 219 struct lcp *lcp = &dl->physical->link.lcp; 220 221 if (mp->active) { 222 /* We're adding a link - do a last validation on our parameters */ 223 if (!peerid_Equal(&dl->peer, &mp->peer)) { 224 log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name); 225 return MP_FAILED; 226 } 227 if (mp->local_mrru != lcp->want_mrru || 228 mp->peer_mrru != lcp->his_mrru || 229 mp->local_is12bit != lcp->want_shortseq || 230 mp->peer_is12bit != lcp->his_shortseq) { 231 log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n", 232 dl->name); 233 return MP_FAILED; 234 } 235 return MP_ADDED; 236 } else { 237 /* First link in multilink mode */ 238 239 mp->local_mrru = lcp->want_mrru; 240 mp->peer_mrru = lcp->his_mrru; 241 mp->local_is12bit = lcp->want_shortseq; 242 mp->peer_is12bit = lcp->his_shortseq; 243 mp->peer = dl->peer; 244 245 throughput_init(&mp->link.throughput); 246 memset(mp->link.Queue, '\0', sizeof mp->link.Queue); 247 memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in); 248 memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out); 249 250 mp->out.seq = 0; 251 mp->out.link = 0; 252 mp->seq.min_in = 0; 253 mp->seq.next_in = 0; 254 255 /* 256 * Now we create our server socket. 257 * If it already exists, join it. Otherwise, create and own it 258 */ 259 switch (mpserver_Open(&mp->server, &mp->peer)) { 260 case MPSERVER_CONNECTED: 261 log_Printf(LogPHASE, "mp: Transfer link on %s\n", 262 mp->server.socket.sun_path); 263 mp->server.send.dl = dl; /* Defer 'till it's safe to send */ 264 return MP_LINKSENT; 265 case MPSERVER_FAILED: 266 return MP_FAILED; 267 case MPSERVER_LISTENING: 268 log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path); 269 log_Printf(LogPHASE, " First link: %s\n", dl->name); 270 271 /* Re-point our IPCP layer at our MP link */ 272 ipcp_SetLink(&mp->bundle->ncp.ipcp, &mp->link); 273 274 /* Our lcp's already up 'cos of the NULL parent */ 275 ccp_SetOpenMode(&mp->link.ccp); 276 fsm_Up(&mp->link.ccp.fsm); 277 fsm_Open(&mp->link.ccp.fsm); 278 279 mp->active = 1; 280 break; 281 } 282 } 283 284 return MP_UP; 285} 286 287void 288mp_Down(struct mp *mp) 289{ 290 if (mp->active) { 291 struct mbuf *next; 292 293 /* Don't want any more of these */ 294 mpserver_Close(&mp->server); 295 296 /* CCP goes down with a bang */ 297 fsm2initial(&mp->link.ccp.fsm); 298 299 /* Received fragments go in the bit-bucket */ 300 while (mp->inbufs) { 301 next = mp->inbufs->pnext; 302 mbuf_Free(mp->inbufs); 303 mp->inbufs = next; 304 } 305 306 peerid_Init(&mp->peer); 307 mp->active = 0; 308 } 309} 310 311void 312mp_linkInit(struct mp_link *mplink) 313{ 314 mplink->seq = 0; 315 mplink->weight = 1500; 316} 317 318void 319mp_Input(struct mp *mp, struct mbuf *m, struct physical *p) 320{ 321 struct mp_header mh, h; 322 struct mbuf *q, *last; 323 int32_t seq; 324 325 /* 326 * When `m' and `p' are NULL, it means our oldest link has gone down. 327 * We want to determine a new min, and process any intermediate stuff 328 * as normal 329 */ 330 331 if (m && mp_ReadHeader(mp, m, &mh) == 0) { 332 mbuf_Free(m); 333 return; 334 } 335 336 if (p) { 337 seq = p->dl->mp.seq; 338 p->dl->mp.seq = mh.seq; 339 } else 340 seq = mp->seq.min_in; 341 342 if (mp->seq.min_in == seq) { 343 /* 344 * We've received new data on the link that has our min (oldest) seq. 345 * Figure out which link now has the smallest (oldest) seq. 346 */ 347 struct datalink *dl; 348 349 mp->seq.min_in = (u_int32_t)-1; 350 for (dl = mp->bundle->links; dl; dl = dl->next) 351 if (dl->state == DATALINK_OPEN && 352 (mp->seq.min_in == -1 || 353 isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in))) 354 mp->seq.min_in = dl->mp.seq; 355 } 356 357 /* 358 * Now process as many of our fragments as we can, adding our new 359 * fragment in as we go, and ordering with the oldest at the top of 360 * the queue. 361 */ 362 363 if (!mp->inbufs) { 364 mp->inbufs = m; 365 m = NULL; 366 } 367 368 last = NULL; 369 seq = mp->seq.next_in; 370 q = mp->inbufs; 371 while (q) { 372 mp_ReadHeader(mp, q, &h); 373 if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) { 374 /* Our received fragment fits in before this one, so link it in */ 375 if (last) 376 last->pnext = m; 377 else 378 mp->inbufs = m; 379 m->pnext = q; 380 q = m; 381 h = mh; 382 m = NULL; 383 } 384 385 if (h.seq != seq) { 386 /* we're missing something :-( */ 387 if (mp->seq.min_in > seq) { 388 /* we're never gonna get it */ 389 struct mbuf *next; 390 391 /* Zap all older fragments */ 392 while (mp->inbufs != q) { 393 log_Printf(LogDEBUG, "Drop frag\n"); 394 next = mp->inbufs->pnext; 395 mbuf_Free(mp->inbufs); 396 mp->inbufs = next; 397 } 398 399 /* 400 * Zap everything until the next `end' fragment OR just before 401 * the next `begin' fragment OR 'till seq.min_in - whichever 402 * comes first. 403 */ 404 do { 405 mp_ReadHeader(mp, mp->inbufs, &h); 406 if (h.begin) { 407 /* We might be able to process this ! */ 408 h.seq--; /* We're gonna look for fragment with h.seq+1 */ 409 break; 410 } 411 next = mp->inbufs->pnext; 412 log_Printf(LogDEBUG, "Drop frag %u\n", h.seq); 413 mbuf_Free(mp->inbufs); 414 mp->inbufs = next; 415 } while (mp->inbufs && (h.seq >= mp->seq.min_in || h.end)); 416 417 /* 418 * Continue processing things from here. 419 * This deals with the possibility that we received a fragment 420 * on the slowest link that invalidates some of our data (because 421 * of the hole at `q'), but where there are subsequent `whole' 422 * packets that have already been received. 423 */ 424 425 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 426 last = NULL; 427 q = mp->inbufs; 428 } else 429 /* we may still receive the missing fragment */ 430 break; 431 } else if (h.end) { 432 /* We've got something, reassemble */ 433 struct mbuf **frag = &q; 434 int len; 435 u_long first = -1; 436 437 do { 438 *frag = mp->inbufs; 439 mp->inbufs = mp->inbufs->pnext; 440 len = mp_ReadHeader(mp, *frag, &h); 441 if (first == -1) 442 first = h.seq; 443 (*frag)->offset += len; 444 (*frag)->cnt -= len; 445 (*frag)->pnext = NULL; 446 if (frag == &q && !h.begin) { 447 log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n", 448 (u_long)h.seq); 449 mbuf_Free(q); 450 q = NULL; 451 } else if (frag != &q && h.begin) { 452 log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n", 453 (u_long)h.seq - 1); 454 /* 455 * Stuff our fragment back at the front of the queue and zap 456 * our half-assembed packet. 457 */ 458 (*frag)->pnext = mp->inbufs; 459 mp->inbufs = *frag; 460 *frag = NULL; 461 mbuf_Free(q); 462 q = NULL; 463 frag = &q; 464 h.end = 0; /* just in case it's a whole packet */ 465 } else 466 do 467 frag = &(*frag)->next; 468 while (*frag != NULL); 469 } while (!h.end); 470 471 if (q) { 472 u_short proto; 473 u_char ch; 474 475 q = mbuf_Read(q, &ch, 1); 476 proto = ch; 477 if (!(proto & 1)) { 478 q = mbuf_Read(q, &ch, 1); 479 proto <<= 8; 480 proto += ch; 481 } 482 if (log_IsKept(LogDEBUG)) 483 log_Printf(LogDEBUG, "MP: Reassembled frags %ld-%lu, length %d\n", 484 first, (u_long)h.seq, mbuf_Length(q)); 485 hdlc_DecodePacket(mp->bundle, proto, q, &mp->link); 486 } 487 488 mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq); 489 last = NULL; 490 q = mp->inbufs; 491 } else { 492 /* Look for the next fragment */ 493 seq = inc_seq(mp->local_is12bit, seq); 494 last = q; 495 q = q->pnext; 496 } 497 } 498 499 if (m) { 500 /* We still have to find a home for our new fragment */ 501 last = NULL; 502 for (q = mp->inbufs; q; last = q, q = q->pnext) { 503 mp_ReadHeader(mp, q, &h); 504 if (isbefore(mp->local_is12bit, mh.seq, h.seq)) 505 break; 506 } 507 /* Our received fragment fits in here */ 508 if (last) 509 last->pnext = m; 510 else 511 mp->inbufs = m; 512 m->pnext = q; 513 } 514} 515 516static void 517mp_Output(struct mp *mp, struct link *l, struct mbuf *m, u_int32_t begin, 518 u_int32_t end) 519{ 520 struct mbuf *mo; 521 522 /* Stuff an MP header on the front of our packet and send it */ 523 mo = mbuf_Alloc(4, MB_MP); 524 mo->next = m; 525 if (mp->peer_is12bit) { 526 u_int16_t *seq16; 527 528 seq16 = (u_int16_t *)MBUF_CTOP(mo); 529 *seq16 = htons((begin << 15) | (end << 14) | (u_int16_t)mp->out.seq); 530 mo->cnt = 2; 531 } else { 532 u_int32_t *seq32; 533 534 seq32 = (u_int32_t *)MBUF_CTOP(mo); 535 *seq32 = htonl((begin << 31) | (end << 30) | (u_int32_t)mp->out.seq); 536 mo->cnt = 4; 537 } 538 if (log_IsKept(LogDEBUG)) 539 log_Printf(LogDEBUG, "MP[frag %d]: Send %d bytes on link `%s'\n", 540 mp->out.seq, mbuf_Length(mo), l->name); 541 mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq); 542 543 if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, PROTO_MP, mo)) 544 hdlc_Output(l, PRI_NORMAL, PROTO_MP, mo); 545} 546 547int 548mp_FillQueues(struct bundle *bundle) 549{ 550 struct mp *mp = &bundle->ncp.mp; 551 struct datalink *dl, *fdl; 552 int total, add, len, thislink, nlinks; 553 u_int32_t begin, end; 554 struct mbuf *m, *mo; 555 556 thislink = nlinks = 0; 557 for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) { 558 /* Include non-open links here as mp->out.link will stay more correct */ 559 if (!fdl) { 560 if (thislink == mp->out.link) 561 fdl = dl; 562 else 563 thislink++; 564 } 565 nlinks++; 566 } 567 568 if (!fdl) { 569 fdl = bundle->links; 570 if (!fdl) 571 return 0; 572 thislink = 0; 573 } 574 575 total = 0; 576 for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) { 577 if (!dl) { 578 dl = bundle->links; 579 thislink = 0; 580 } 581 582 if (dl->state != DATALINK_OPEN) 583 continue; 584 585 if (dl->physical->out) 586 /* this link has suffered a short write. Let it continue */ 587 continue; 588 589 add = link_QueueLen(&dl->physical->link); 590 total += add; 591 if (add) 592 /* this link has got stuff already queued. Let it continue */ 593 continue; 594 595 if (!link_QueueLen(&mp->link) && !ip_FlushPacket(&mp->link, bundle)) 596 /* Nothing else to send */ 597 break; 598 599 m = link_Dequeue(&mp->link); 600 len = mbuf_Length(m); 601 begin = 1; 602 end = 0; 603 604 while (!end) { 605 if (dl->state == DATALINK_OPEN) { 606 if (len <= dl->mp.weight + LINK_MINWEIGHT) { 607 /* 608 * XXX: Should we remember how much of our `weight' wasn't sent 609 * so that we can compensate next time ? 610 */ 611 mo = m; 612 end = 1; 613 } else { 614 mo = mbuf_Alloc(dl->mp.weight, MB_MP); 615 mo->cnt = dl->mp.weight; 616 len -= mo->cnt; 617 m = mbuf_Read(m, MBUF_CTOP(mo), mo->cnt); 618 } 619 mp_Output(mp, &dl->physical->link, mo, begin, end); 620 begin = 0; 621 } 622 623 if (!end) { 624 nlinks--; 625 dl = dl->next; 626 if (!dl) { 627 dl = bundle->links; 628 thislink = 0; 629 } else 630 thislink++; 631 } 632 } 633 } 634 mp->out.link = thislink; /* Start here next time */ 635 636 return total; 637} 638 639int 640mp_SetDatalinkWeight(struct cmdargs const *arg) 641{ 642 int val; 643 644 if (arg->argc != arg->argn+1) 645 return -1; 646 647 val = atoi(arg->argv[arg->argn]); 648 if (val < LINK_MINWEIGHT) { 649 log_Printf(LogWARN, "Link weights must not be less than %d\n", 650 LINK_MINWEIGHT); 651 return 1; 652 } 653 arg->cx->mp.weight = val; 654 return 0; 655} 656 657int 658mp_ShowStatus(struct cmdargs const *arg) 659{ 660 struct mp *mp = &arg->bundle->ncp.mp; 661 662 prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in"); 663 if (mp->active) { 664 struct mbuf *m; 665 int bufs = 0; 666 667 prompt_Printf(arg->prompt, "Socket: %s\n", 668 mp->server.socket.sun_path); 669 for (m = mp->inbufs; m; m = m->pnext) 670 bufs++; 671 prompt_Printf(arg->prompt, "Pending frags: %d\n", bufs); 672 } 673 674 prompt_Printf(arg->prompt, "\nMy Side:\n"); 675 if (mp->active) { 676 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru); 677 prompt_Printf(arg->prompt, " Short Seq: %s\n", 678 mp->local_is12bit ? "on" : "off"); 679 } 680 prompt_Printf(arg->prompt, " Discriminator: %s\n", 681 mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address, 682 mp->cfg.enddisc.len)); 683 684 prompt_Printf(arg->prompt, "\nHis Side:\n"); 685 if (mp->active) { 686 prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname); 687 prompt_Printf(arg->prompt, " Next SEQ: %u\n", mp->out.seq); 688 prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru); 689 prompt_Printf(arg->prompt, " Short Seq: %s\n", 690 mp->peer_is12bit ? "on" : "off"); 691 } 692 prompt_Printf(arg->prompt, " Discriminator: %s\n", 693 mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address, 694 mp->peer.enddisc.len)); 695 696 prompt_Printf(arg->prompt, "\nDefaults:\n"); 697 698 prompt_Printf(arg->prompt, " MRRU: "); 699 if (mp->cfg.mrru) 700 prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru); 701 else 702 prompt_Printf(arg->prompt, "disabled\n"); 703 prompt_Printf(arg->prompt, " Short Seq: %s\n", 704 command_ShowNegval(mp->cfg.shortseq)); 705 706 return 0; 707} 708 709const char * 710mp_Enddisc(u_char c, const char *address, int len) 711{ 712 static char result[100]; /* Used immediately after it's returned */ 713 int f, header; 714 715 switch (c) { 716 case ENDDISC_NULL: 717 sprintf(result, "Null Class"); 718 break; 719 720 case ENDDISC_LOCAL: 721 snprintf(result, sizeof result, "Local Addr: %.*s", len, address); 722 break; 723 724 case ENDDISC_IP: 725 if (len == 4) 726 snprintf(result, sizeof result, "IP %s", 727 inet_ntoa(*(const struct in_addr *)address)); 728 else 729 sprintf(result, "IP[%d] ???", len); 730 break; 731 732 case ENDDISC_MAC: 733 if (len == 6) { 734 const u_char *m = (const u_char *)address; 735 snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x", 736 m[0], m[1], m[2], m[3], m[4], m[5]); 737 } else 738 sprintf(result, "MAC[%d] ???", len); 739 break; 740 741 case ENDDISC_MAGIC: 742 sprintf(result, "Magic: 0x"); 743 header = strlen(result); 744 if (len > sizeof result - header - 1) 745 len = sizeof result - header - 1; 746 for (f = 0; f < len; f++) 747 sprintf(result + header + 2 * f, "%02x", address[f]); 748 break; 749 750 case ENDDISC_PSN: 751 snprintf(result, sizeof result, "PSN: %.*s", len, address); 752 break; 753 754 default: 755 sprintf(result, "%d: ", (int)c); 756 header = strlen(result); 757 if (len > sizeof result - header - 1) 758 len = sizeof result - header - 1; 759 for (f = 0; f < len; f++) 760 sprintf(result + header + 2 * f, "%02x", address[f]); 761 break; 762 } 763 return result; 764} 765 766int 767mp_SetEnddisc(struct cmdargs const *arg) 768{ 769 struct mp *mp = &arg->bundle->ncp.mp; 770 struct in_addr addr; 771 772 if (bundle_Phase(arg->bundle) != PHASE_DEAD) { 773 log_Printf(LogWARN, "set enddisc: Only available at phase DEAD\n"); 774 return 1; 775 } 776 777 if (arg->argc == arg->argn) { 778 mp->cfg.enddisc.class = 0; 779 *mp->cfg.enddisc.address = '\0'; 780 mp->cfg.enddisc.len = 0; 781 } else if (arg->argc > arg->argn) { 782 if (!strcasecmp(arg->argv[arg->argn], "label")) { 783 mp->cfg.enddisc.class = ENDDISC_LOCAL; 784 strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label); 785 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 786 } else if (!strcasecmp(arg->argv[arg->argn], "ip")) { 787 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 788 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 789 else 790 addr = arg->bundle->ncp.ipcp.my_ip; 791 memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr); 792 mp->cfg.enddisc.class = ENDDISC_IP; 793 mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr; 794 } else if (!strcasecmp(arg->argv[arg->argn], "mac")) { 795 struct sockaddr_dl hwaddr; 796 int s; 797 798 if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY) 799 addr = arg->bundle->ncp.ipcp.cfg.my_range.ipaddr; 800 else 801 addr = arg->bundle->ncp.ipcp.my_ip; 802 803 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 804 if (s < 0) { 805 log_Printf(LogERROR, "set enddisc: socket(): %s\n", strerror(errno)); 806 return 2; 807 } 808 if (get_ether_addr(s, addr, &hwaddr)) { 809 mp->cfg.enddisc.class = ENDDISC_MAC; 810 memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen, 811 hwaddr.sdl_alen); 812 mp->cfg.enddisc.len = hwaddr.sdl_alen; 813 } else { 814 log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n", 815 inet_ntoa(addr)); 816 close(s); 817 return 4; 818 } 819 close(s); 820 } else if (!strcasecmp(arg->argv[arg->argn], "magic")) { 821 int f; 822 823 randinit(); 824 for (f = 0; f < 20; f += sizeof(long)) 825 *(long *)(mp->cfg.enddisc.address + f) = random(); 826 mp->cfg.enddisc.class = ENDDISC_MAGIC; 827 mp->cfg.enddisc.len = 20; 828 } else if (!strcasecmp(arg->argv[arg->argn], "psn")) { 829 if (arg->argc > arg->argn+1) { 830 mp->cfg.enddisc.class = ENDDISC_PSN; 831 strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]); 832 mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address); 833 } else { 834 log_Printf(LogWARN, "PSN endpoint requires additional data\n"); 835 return 5; 836 } 837 } else { 838 log_Printf(LogWARN, "%s: Unrecognised endpoint type\n", 839 arg->argv[arg->argn]); 840 return 6; 841 } 842 } 843 844 return 0; 845} 846 847static int 848mpserver_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, 849 int *n) 850{ 851 struct mpserver *s = descriptor2mpserver(d); 852 int result; 853 854 result = 0; 855 if (s->send.dl != NULL) { 856 /* We've connect()ed */ 857 if (!link_QueueLen(&s->send.dl->physical->link) && 858 !s->send.dl->physical->out) { 859 /* Only send if we've transmitted all our data (i.e. the ConfigAck) */ 860 result -= datalink_RemoveFromSet(s->send.dl, r, w, e); 861 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 862 s->send.dl = NULL; 863 s->fd = -1; 864 } else 865 /* Never read from a datalink that's on death row ! */ 866 result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL); 867 } else if (r && s->fd >= 0) { 868 if (*n < s->fd + 1) 869 *n = s->fd + 1; 870 FD_SET(s->fd, r); 871 log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd); 872 result++; 873 } 874 return result; 875} 876 877static int 878mpserver_IsSet(struct descriptor *d, const fd_set *fdset) 879{ 880 struct mpserver *s = descriptor2mpserver(d); 881 return s->fd >= 0 && FD_ISSET(s->fd, fdset); 882} 883 884static void 885mpserver_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 886{ 887 struct mpserver *s = descriptor2mpserver(d); 888 struct sockaddr in; 889 int fd, size; 890 891 size = sizeof in; 892 fd = accept(s->fd, &in, &size); 893 if (fd < 0) { 894 log_Printf(LogERROR, "mpserver_Read: accept(): %s\n", strerror(errno)); 895 return; 896 } 897 898 if (in.sa_family == AF_LOCAL) 899 bundle_ReceiveDatalink(bundle, fd, (struct sockaddr_un *)&in); 900 else 901 close(fd); 902} 903 904static int 905mpserver_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 906{ 907 /* We never want to write here ! */ 908 log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n"); 909 return 0; 910} 911 912void 913mpserver_Init(struct mpserver *s) 914{ 915 s->desc.type = MPSERVER_DESCRIPTOR; 916 s->desc.UpdateSet = mpserver_UpdateSet; 917 s->desc.IsSet = mpserver_IsSet; 918 s->desc.Read = mpserver_Read; 919 s->desc.Write = mpserver_Write; 920 s->send.dl = NULL; 921 s->fd = -1; 922 memset(&s->socket, '\0', sizeof s->socket); 923} 924 925int 926mpserver_Open(struct mpserver *s, struct peerid *peer) 927{ 928 int f, l; 929 mode_t mask; 930 931 if (s->fd != -1) { 932 log_Printf(LogALERT, "Internal error ! mpserver already open\n"); 933 mpserver_Close(s); 934 } 935 936 l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-", 937 _PATH_VARRUN, peer->authname, peer->enddisc.class); 938 939 for (f = 0; f < peer->enddisc.len && l < sizeof s->socket.sun_path - 2; f++) { 940 snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l, 941 "%02x", *(u_char *)(peer->enddisc.address+f)); 942 l += 2; 943 } 944 945 s->socket.sun_family = AF_LOCAL; 946 s->socket.sun_len = sizeof s->socket; 947 s->fd = ID0socket(PF_LOCAL, SOCK_STREAM, 0); 948 if (s->fd < 0) { 949 log_Printf(LogERROR, "mpserver: socket: %s\n", strerror(errno)); 950 return MPSERVER_FAILED; 951 } 952 953 setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket, 954 sizeof s->socket); 955 mask = umask(0177); 956 if (ID0bind_un(s->fd, &s->socket) < 0) { 957 if (errno != EADDRINUSE) { 958 log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n", 959 s->socket.sun_path, strerror(errno)); 960 umask(mask); 961 close(s->fd); 962 s->fd = -1; 963 return MPSERVER_FAILED; 964 } 965 umask(mask); 966 if (ID0connect_un(s->fd, &s->socket) < 0) { 967 log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n", 968 s->socket.sun_path, strerror(errno)); 969 if (errno == ECONNREFUSED) 970 log_Printf(LogPHASE, " Has the previous server died badly ?\n"); 971 close(s->fd); 972 s->fd = -1; 973 return MPSERVER_FAILED; 974 } 975 976 /* Donate our link to the other guy */ 977 return MPSERVER_CONNECTED; 978 } 979 980 /* Listen for other ppp invocations that want to donate links */ 981 if (listen(s->fd, 5) != 0) { 982 log_Printf(LogERROR, "mpserver: Unable to listen to socket" 983 " - BUNDLE overload?\n"); 984 mpserver_Close(s); 985 } 986 987 return MPSERVER_LISTENING; 988} 989 990void 991mpserver_Close(struct mpserver *s) 992{ 993 if (s->send.dl != NULL) { 994 bundle_SendDatalink(s->send.dl, s->fd, &s->socket); 995 s->send.dl = NULL; 996 s->fd = -1; 997 } else if (s->fd >= 0) { 998 close(s->fd); 999 if (ID0unlink(s->socket.sun_path) == -1) 1000 log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path, 1001 strerror(errno)); 1002 memset(&s->socket, '\0', sizeof s->socket); 1003 s->fd = -1; 1004 } 1005} 1006 1007void 1008mp_LinkLost(struct mp *mp, struct datalink *dl) 1009{ 1010 if (mp->seq.min_in == dl->mp.seq) 1011 /* We've lost the link that's holding everything up ! */ 1012 mp_Input(mp, NULL, NULL); 1013} 1014