1 /* $OpenBSD: if_ppp.c,v 1.63 2011/07/07 20:42:56 henning Exp $ */ 2 /* $NetBSD: if_ppp.c,v 1.39 1997/05/17 21:11:59 christos Exp $ */ 3 4 /* 5 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. 6 * 7 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The name "Carnegie Mellon University" must not be used to 22 * endorse or promote products derived from this software without 23 * prior written permission. For permission or any legal 24 * details, please contact 25 * Office of Technology Transfer 26 * Carnegie Mellon University 27 * 5000 Forbes Avenue 28 * Pittsburgh, PA 15213-3890 29 * (412) 268-4387, fax: (412) 268-7395 30 * tech-transfer@andrew.cmu.edu 31 * 32 * 4. Redistributions of any form whatsoever must retain the following 33 * acknowledgment: 34 * "This product includes software developed by Computing Services 35 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 36 * 37 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 38 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 39 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 40 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 42 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 43 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 44 * 45 * Based on: 46 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 47 * 48 * Copyright (c) 1987, 1989, 1992, 1993 49 * The Regents of the University of California. All rights reserved. 50 * 51 * Redistribution and use in source and binary forms, with or without 52 * modification, are permitted provided that the following conditions 53 * are met: 54 * 1. Redistributions of source code must retain the above copyright 55 * notice, this list of conditions and the following disclaimer. 56 * 2. Redistributions in binary form must reproduce the above copyright 57 * notice, this list of conditions and the following disclaimer in the 58 * documentation and/or other materials provided with the distribution. 59 * 3. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * Serial Line interface 76 * 77 * Rick Adams 78 * Center for Seismic Studies 79 * 1300 N 17th Street, Suite 1450 80 * Arlington, Virginia 22209 81 * (703)276-7900 82 * rick@seismo.ARPA 83 * seismo!rick 84 * 85 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). 86 * Converted to 4.3BSD Beta by Chris Torek. 87 * Other changes made at Berkeley, based in part on code by Kirk Smith. 88 * 89 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) 90 * Added VJ tcp header compression; more unified ioctls 91 * 92 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). 93 * Cleaned up a lot of the mbuf-related code to fix bugs that 94 * caused system crashes and packet corruption. Changed pppstart 95 * so that it doesn't just give up with a collision if the whole 96 * packet doesn't fit in the output ring buffer. 97 * 98 * Added priority queueing for interactive IP packets, following 99 * the model of if_sl.c, plus hooks for bpf. 100 * Paul Mackerras (paulus@cs.anu.edu.au). 101 */ 102 103 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 104 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 105 106 #include "ppp.h" 107 #if NPPP > 0 108 109 #define VJC 110 #define PPP_COMPRESS 111 112 #include <sys/param.h> 113 #include <sys/proc.h> 114 #include <sys/mbuf.h> 115 #include <sys/socket.h> 116 #include <sys/ioctl.h> 117 #include <sys/kernel.h> 118 #include <sys/systm.h> 119 #include <sys/time.h> 120 #include <sys/malloc.h> 121 122 #include <net/if.h> 123 #include <net/if_types.h> 124 #include <net/netisr.h> 125 #include <net/route.h> 126 #include <net/bpf.h> 127 128 #ifdef INET 129 #include <netinet/in.h> 130 #include <netinet/in_systm.h> 131 #include <netinet/in_var.h> 132 #include <netinet/ip.h> 133 #else 134 #ifdef _KERNEL 135 #ifdef VJC 136 #error ppp device with VJC assumes INET 137 #endif 138 #endif 139 #endif 140 141 #include "bpfilter.h" 142 #if NBPFILTER > 0 143 #include <net/bpf.h> 144 #endif 145 146 #ifdef VJC 147 #include <net/slcompress.h> 148 #endif 149 150 #include <net/ppp_defs.h> 151 #include <net/if_ppp.h> 152 #include <net/if_pppvar.h> 153 #include <machine/cpu.h> 154 155 #ifdef PPP_COMPRESS 156 #define PACKETPTR struct mbuf * 157 #include <net/ppp-comp.h> 158 #endif 159 160 static int pppsioctl(struct ifnet *, u_long, caddr_t); 161 static void ppp_requeue(struct ppp_softc *); 162 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 163 static void ppp_ccp_closed(struct ppp_softc *); 164 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 165 static void pppdumpm(struct mbuf *m0); 166 static void ppp_ifstart(struct ifnet *ifp); 167 int ppp_clone_create(struct if_clone *, int); 168 int ppp_clone_destroy(struct ifnet *); 169 170 /* 171 * Some useful mbuf macros not in mbuf.h. 172 */ 173 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 174 175 #define M_DATASTART(m) \ 176 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 177 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 178 179 #define M_DATASIZE(m) \ 180 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 181 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 182 183 /* 184 * We steal two bits in the mbuf m_flags, to mark high-priority packets 185 * for output, and received packets following lost/corrupted packets. 186 */ 187 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 188 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 189 190 191 #ifdef PPP_COMPRESS 192 /* 193 * List of compressors we know about. 194 * We leave some space so maybe we can modload compressors. 195 */ 196 197 extern struct compressor ppp_bsd_compress; 198 extern struct compressor ppp_deflate, ppp_deflate_draft; 199 200 struct compressor *ppp_compressors[8] = { 201 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 202 &ppp_bsd_compress, 203 #endif 204 #if DO_DEFLATE && defined(PPP_DEFLATE) 205 &ppp_deflate, 206 &ppp_deflate_draft, 207 #endif 208 NULL 209 }; 210 #endif /* PPP_COMPRESS */ 211 212 LIST_HEAD(, ppp_softc) ppp_softc_list; 213 struct if_clone ppp_cloner = 214 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 215 216 /* 217 * Called from boot code to establish ppp interfaces. 218 */ 219 void 220 pppattach() 221 { 222 LIST_INIT(&ppp_softc_list); 223 if_clone_attach(&ppp_cloner); 224 } 225 226 int 227 ppp_clone_create(ifc, unit) 228 struct if_clone *ifc; 229 int unit; 230 { 231 struct ppp_softc *sc; 232 int s; 233 234 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); 235 if (!sc) 236 return (ENOMEM); 237 238 sc->sc_unit = unit; 239 snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d", 240 ifc->ifc_name, unit); 241 sc->sc_if.if_softc = sc; 242 sc->sc_if.if_mtu = PPP_MTU; 243 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 244 sc->sc_if.if_type = IFT_PPP; 245 sc->sc_if.if_hdrlen = PPP_HDRLEN; 246 sc->sc_if.if_ioctl = pppsioctl; 247 sc->sc_if.if_output = pppoutput; 248 sc->sc_if.if_start = ppp_ifstart; 249 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, ifqmaxlen); 250 IFQ_SET_MAXLEN(&sc->sc_inq, ifqmaxlen); 251 IFQ_SET_MAXLEN(&sc->sc_fastq, ifqmaxlen); 252 IFQ_SET_MAXLEN(&sc->sc_rawq, ifqmaxlen); 253 IFQ_SET_READY(&sc->sc_if.if_snd); 254 if_attach(&sc->sc_if); 255 if_alloc_sadl(&sc->sc_if); 256 #if NBPFILTER > 0 257 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 258 #endif 259 s = splnet(); 260 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 261 splx(s); 262 263 return (0); 264 } 265 266 int 267 ppp_clone_destroy(ifp) 268 struct ifnet *ifp; 269 { 270 struct ppp_softc *sc = ifp->if_softc; 271 int s; 272 273 if (sc->sc_devp != NULL) 274 return (EBUSY); 275 276 s = splnet(); 277 LIST_REMOVE(sc, sc_list); 278 splx(s); 279 280 if_detach(ifp); 281 282 free(sc, M_DEVBUF); 283 return (0); 284 } 285 286 /* 287 * Allocate a ppp interface unit and initialize it. 288 */ 289 struct ppp_softc * 290 pppalloc(pid) 291 pid_t pid; 292 { 293 int i; 294 struct ppp_softc *sc; 295 296 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 297 if (sc->sc_xfer == pid) { 298 sc->sc_xfer = 0; 299 return sc; 300 } 301 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 302 if (sc->sc_devp == NULL) 303 break; 304 if (sc == NULL) 305 return NULL; 306 307 sc->sc_flags = 0; 308 sc->sc_mru = PPP_MRU; 309 sc->sc_relinq = NULL; 310 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 311 #ifdef VJC 312 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 313 if (sc->sc_comp) 314 sl_compress_init(sc->sc_comp); 315 #endif 316 #ifdef PPP_COMPRESS 317 sc->sc_xc_state = NULL; 318 sc->sc_rc_state = NULL; 319 #endif /* PPP_COMPRESS */ 320 for (i = 0; i < NUM_NP; ++i) 321 sc->sc_npmode[i] = NPMODE_ERROR; 322 sc->sc_npqueue = NULL; 323 sc->sc_npqtail = &sc->sc_npqueue; 324 sc->sc_last_sent = sc->sc_last_recv = time_second; 325 326 return sc; 327 } 328 329 /* 330 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 331 */ 332 void 333 pppdealloc(sc) 334 struct ppp_softc *sc; 335 { 336 struct mbuf *m; 337 338 splsoftassert(IPL_SOFTNET); 339 340 if_down(&sc->sc_if); 341 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 342 sc->sc_devp = NULL; 343 sc->sc_xfer = 0; 344 for (;;) { 345 IF_DEQUEUE(&sc->sc_rawq, m); 346 if (m == NULL) 347 break; 348 m_freem(m); 349 } 350 for (;;) { 351 IF_DEQUEUE(&sc->sc_inq, m); 352 if (m == NULL) 353 break; 354 m_freem(m); 355 } 356 for (;;) { 357 IF_DEQUEUE(&sc->sc_fastq, m); 358 if (m == NULL) 359 break; 360 m_freem(m); 361 } 362 while ((m = sc->sc_npqueue) != NULL) { 363 sc->sc_npqueue = m->m_nextpkt; 364 m_freem(m); 365 } 366 if (sc->sc_togo != NULL) { 367 m_freem(sc->sc_togo); 368 sc->sc_togo = NULL; 369 } 370 #ifdef PPP_COMPRESS 371 ppp_ccp_closed(sc); 372 sc->sc_xc_state = NULL; 373 sc->sc_rc_state = NULL; 374 #endif /* PPP_COMPRESS */ 375 #if NBPFILTER > 0 376 if (sc->sc_pass_filt.bf_insns != 0) { 377 free(sc->sc_pass_filt.bf_insns, M_DEVBUF); 378 sc->sc_pass_filt.bf_insns = 0; 379 sc->sc_pass_filt.bf_len = 0; 380 } 381 if (sc->sc_active_filt.bf_insns != 0) { 382 free(sc->sc_active_filt.bf_insns, M_DEVBUF); 383 sc->sc_active_filt.bf_insns = 0; 384 sc->sc_active_filt.bf_len = 0; 385 } 386 #endif 387 #ifdef VJC 388 if (sc->sc_comp != 0) { 389 free(sc->sc_comp, M_DEVBUF); 390 sc->sc_comp = 0; 391 } 392 #endif 393 } 394 395 /* 396 * Ioctl routine for generic ppp devices. 397 */ 398 int 399 pppioctl(sc, cmd, data, flag, p) 400 struct ppp_softc *sc; 401 u_long cmd; 402 caddr_t data; 403 int flag; 404 struct proc *p; 405 { 406 int s, error, flags, mru, npx; 407 u_int nb; 408 struct ppp_option_data *odp; 409 struct compressor **cp; 410 struct npioctl *npi; 411 time_t t; 412 #if NBPFILTER > 0 413 struct bpf_program *bp, *nbp; 414 struct bpf_insn *newcode, *oldcode; 415 int newcodelen; 416 #endif 417 #ifdef PPP_COMPRESS 418 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 419 #endif 420 421 switch (cmd) { 422 case FIONREAD: 423 *(int *)data = IFQ_LEN(&sc->sc_inq); 424 break; 425 426 case PPPIOCGUNIT: 427 *(int *)data = sc->sc_unit; /* XXX */ 428 break; 429 430 case PPPIOCGFLAGS: 431 *(u_int *)data = sc->sc_flags; 432 break; 433 434 case PPPIOCSFLAGS: 435 if ((error = suser(p, 0)) != 0) 436 return (error); 437 flags = *(int *)data & SC_MASK; 438 s = splsoftnet(); 439 #ifdef PPP_COMPRESS 440 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 441 ppp_ccp_closed(sc); 442 #endif 443 splnet(); 444 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 445 splx(s); 446 break; 447 448 case PPPIOCSMRU: 449 if ((error = suser(p, 0)) != 0) 450 return (error); 451 mru = *(int *)data; 452 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 453 sc->sc_mru = mru; 454 break; 455 456 case PPPIOCGMRU: 457 *(int *)data = sc->sc_mru; 458 break; 459 460 #ifdef VJC 461 case PPPIOCSMAXCID: 462 if ((error = suser(p, 0)) != 0) 463 return (error); 464 if (sc->sc_comp) { 465 s = splsoftnet(); 466 sl_compress_setup(sc->sc_comp, *(int *)data); 467 splx(s); 468 } 469 break; 470 #endif 471 472 case PPPIOCXFERUNIT: 473 if ((error = suser(p, 0)) != 0) 474 return (error); 475 sc->sc_xfer = p->p_pid; 476 break; 477 478 #ifdef PPP_COMPRESS 479 case PPPIOCSCOMPRESS: 480 if ((error = suser(p, 0)) != 0) 481 return (error); 482 odp = (struct ppp_option_data *) data; 483 nb = odp->length; 484 if (nb > sizeof(ccp_option)) 485 nb = sizeof(ccp_option); 486 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 487 return (error); 488 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 489 return (EINVAL); 490 for (cp = ppp_compressors; *cp != NULL; ++cp) 491 if ((*cp)->compress_proto == ccp_option[0]) { 492 /* 493 * Found a handler for the protocol - try to allocate 494 * a compressor or decompressor. 495 */ 496 error = 0; 497 if (odp->transmit) { 498 s = splsoftnet(); 499 if (sc->sc_xc_state != NULL) 500 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 501 sc->sc_xcomp = *cp; 502 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 503 if (sc->sc_xc_state == NULL) { 504 if (sc->sc_flags & SC_DEBUG) 505 printf("%s: comp_alloc failed\n", 506 sc->sc_if.if_xname); 507 error = ENOBUFS; 508 } 509 splnet(); 510 sc->sc_flags &= ~SC_COMP_RUN; 511 splx(s); 512 } else { 513 s = splsoftnet(); 514 if (sc->sc_rc_state != NULL) 515 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 516 sc->sc_rcomp = *cp; 517 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 518 if (sc->sc_rc_state == NULL) { 519 if (sc->sc_flags & SC_DEBUG) 520 printf("%s: decomp_alloc failed\n", 521 sc->sc_if.if_xname); 522 error = ENOBUFS; 523 } 524 splnet(); 525 sc->sc_flags &= ~SC_DECOMP_RUN; 526 splx(s); 527 } 528 return (error); 529 } 530 if (sc->sc_flags & SC_DEBUG) 531 printf("%s: no compressor for [%x %x %x], %x\n", 532 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 533 ccp_option[2], nb); 534 return (EINVAL); /* no handler found */ 535 #endif /* PPP_COMPRESS */ 536 537 case PPPIOCGNPMODE: 538 case PPPIOCSNPMODE: 539 npi = (struct npioctl *) data; 540 switch (npi->protocol) { 541 case PPP_IP: 542 npx = NP_IP; 543 break; 544 default: 545 return EINVAL; 546 } 547 if (cmd == PPPIOCGNPMODE) { 548 npi->mode = sc->sc_npmode[npx]; 549 } else { 550 if ((error = suser(p, 0)) != 0) 551 return (error); 552 if (npi->mode != sc->sc_npmode[npx]) { 553 s = splsoftnet(); 554 sc->sc_npmode[npx] = npi->mode; 555 if (npi->mode != NPMODE_QUEUE) { 556 ppp_requeue(sc); 557 (*sc->sc_start)(sc); 558 } 559 splx(s); 560 } 561 } 562 break; 563 564 case PPPIOCGIDLE: 565 s = splsoftnet(); 566 t = time_second; 567 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 568 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 569 splx(s); 570 break; 571 572 #if NBPFILTER > 0 573 case PPPIOCSPASS: 574 case PPPIOCSACTIVE: 575 nbp = (struct bpf_program *) data; 576 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 577 return EINVAL; 578 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 579 if (newcodelen != 0) { 580 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 581 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 582 newcodelen)) != 0) { 583 free(newcode, M_DEVBUF); 584 return error; 585 } 586 if (!bpf_validate(newcode, nbp->bf_len)) { 587 free(newcode, M_DEVBUF); 588 return EINVAL; 589 } 590 } else 591 newcode = 0; 592 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 593 oldcode = bp->bf_insns; 594 s = splnet(); 595 bp->bf_len = nbp->bf_len; 596 bp->bf_insns = newcode; 597 splx(s); 598 if (oldcode != 0) 599 free(oldcode, M_DEVBUF); 600 break; 601 #endif 602 603 default: 604 return (-1); 605 } 606 return (0); 607 } 608 609 /* 610 * Process an ioctl request to the ppp network interface. 611 */ 612 static int 613 pppsioctl(ifp, cmd, data) 614 struct ifnet *ifp; 615 u_long cmd; 616 caddr_t data; 617 { 618 struct ppp_softc *sc = ifp->if_softc; 619 struct ifaddr *ifa = (struct ifaddr *)data; 620 struct ifreq *ifr = (struct ifreq *)data; 621 struct ppp_stats *psp; 622 #ifdef PPP_COMPRESS 623 struct ppp_comp_stats *pcp; 624 #endif 625 int s = splnet(), error = 0; 626 627 switch (cmd) { 628 case SIOCSIFFLAGS: 629 if ((ifp->if_flags & IFF_RUNNING) == 0) 630 ifp->if_flags &= ~IFF_UP; 631 break; 632 633 case SIOCSIFADDR: 634 if (ifa->ifa_addr->sa_family != AF_INET) 635 error = EAFNOSUPPORT; 636 break; 637 638 case SIOCSIFDSTADDR: 639 if (ifa->ifa_addr->sa_family != AF_INET) 640 error = EAFNOSUPPORT; 641 break; 642 643 case SIOCSIFMTU: 644 sc->sc_if.if_mtu = ifr->ifr_mtu; 645 break; 646 647 case SIOCADDMULTI: 648 case SIOCDELMULTI: 649 if (ifr == 0) { 650 error = EAFNOSUPPORT; 651 break; 652 } 653 switch(ifr->ifr_addr.sa_family) { 654 #ifdef INET 655 case AF_INET: 656 break; 657 #endif 658 default: 659 error = EAFNOSUPPORT; 660 break; 661 } 662 break; 663 664 case SIOCGPPPSTATS: 665 psp = &((struct ifpppstatsreq *) data)->stats; 666 bzero(psp, sizeof(*psp)); 667 psp->p = sc->sc_stats; 668 #if defined(VJC) && !defined(SL_NO_STATS) 669 if (sc->sc_comp) { 670 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 671 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 672 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 673 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 674 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 675 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 676 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 677 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 678 } 679 #endif /* VJC */ 680 break; 681 682 #ifdef PPP_COMPRESS 683 case SIOCGPPPCSTATS: 684 pcp = &((struct ifpppcstatsreq *) data)->stats; 685 bzero(pcp, sizeof(*pcp)); 686 if (sc->sc_xc_state != NULL) 687 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 688 if (sc->sc_rc_state != NULL) 689 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 690 break; 691 #endif /* PPP_COMPRESS */ 692 693 default: 694 error = ENOTTY; 695 } 696 splx(s); 697 return (error); 698 } 699 700 /* 701 * Queue a packet. Start transmission if not active. 702 * Packet is placed in Information field of PPP frame. 703 */ 704 int 705 pppoutput(ifp, m0, dst, rtp) 706 struct ifnet *ifp; 707 struct mbuf *m0; 708 struct sockaddr *dst; 709 struct rtentry *rtp; 710 { 711 struct ppp_softc *sc = ifp->if_softc; 712 int protocol, address, control; 713 u_char *cp; 714 int s, error; 715 struct ip *ip; 716 struct ifqueue *ifq; 717 enum NPmode mode; 718 int len; 719 720 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 721 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 722 error = ENETDOWN; /* sort of */ 723 goto bad; 724 } 725 726 #ifdef DIAGNOSTIC 727 if (ifp->if_rdomain != rtable_l2(m0->m_pkthdr.rdomain)) { 728 printf("%s: trying to send packet on wrong domain. " 729 "if %d vs. mbuf %d, AF %d\n", ifp->if_xname, ifp->if_rdomain, 730 rtable_l2(m0->m_pkthdr.rdomain), dst->sa_family); 731 } 732 #endif 733 734 /* 735 * Compute PPP header. 736 */ 737 m0->m_flags &= ~M_HIGHPRI; 738 switch (dst->sa_family) { 739 #ifdef INET 740 case AF_INET: 741 address = PPP_ALLSTATIONS; 742 control = PPP_UI; 743 protocol = PPP_IP; 744 mode = sc->sc_npmode[NP_IP]; 745 746 /* 747 * If this packet has the "low delay" bit set in the IP header, 748 * put it on the fastq instead. 749 */ 750 ip = mtod(m0, struct ip *); 751 if (ip->ip_tos & IPTOS_LOWDELAY) 752 m0->m_flags |= M_HIGHPRI; 753 break; 754 #endif 755 case AF_UNSPEC: 756 address = PPP_ADDRESS(dst->sa_data); 757 control = PPP_CONTROL(dst->sa_data); 758 protocol = PPP_PROTOCOL(dst->sa_data); 759 mode = NPMODE_PASS; 760 break; 761 default: 762 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 763 error = EAFNOSUPPORT; 764 goto bad; 765 } 766 767 /* 768 * Drop this packet, or return an error, if necessary. 769 */ 770 if (mode == NPMODE_ERROR) { 771 error = ENETDOWN; 772 goto bad; 773 } 774 if (mode == NPMODE_DROP) { 775 error = 0; 776 goto bad; 777 } 778 779 /* 780 * Add PPP header. If no space in first mbuf, allocate another. 781 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 782 */ 783 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 784 if (m0 == 0) { 785 error = ENOBUFS; 786 goto bad; 787 } 788 789 cp = mtod(m0, u_char *); 790 *cp++ = address; 791 *cp++ = control; 792 *cp++ = protocol >> 8; 793 *cp++ = protocol & 0xff; 794 795 if ((m0->m_flags & M_PKTHDR) == 0) 796 panic("mbuf packet without packet header!"); 797 len = m0->m_pkthdr.len; 798 799 if (sc->sc_flags & SC_LOG_OUTPKT) { 800 printf("%s output: ", ifp->if_xname); 801 pppdumpm(m0); 802 } 803 804 if ((protocol & 0x8000) == 0) { 805 #if NBPFILTER > 0 806 /* 807 * Apply the pass and active filters to the packet, 808 * but only if it is a data packet. 809 */ 810 *mtod(m0, u_char *) = 1; /* indicates outbound */ 811 if (sc->sc_pass_filt.bf_insns != 0 812 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 813 len, 0) == 0) { 814 error = 0; /* drop this packet */ 815 goto bad; 816 } 817 818 /* 819 * Update the time we sent the most recent packet. 820 */ 821 if (sc->sc_active_filt.bf_insns == 0 822 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 823 sc->sc_last_sent = time_second; 824 825 *mtod(m0, u_char *) = address; 826 #else 827 /* 828 * Update the time we sent the most recent packet. 829 */ 830 sc->sc_last_sent = time_second; 831 #endif 832 } 833 834 #if NBPFILTER > 0 835 /* 836 * See if bpf wants to look at the packet. 837 */ 838 if (sc->sc_bpf) 839 bpf_mtap(sc->sc_bpf, m0, BPF_DIRECTION_OUT); 840 #endif 841 842 /* 843 * Put the packet on the appropriate queue. 844 */ 845 s = splsoftnet(); 846 if (mode == NPMODE_QUEUE) { 847 /* XXX we should limit the number of packets on this queue */ 848 *sc->sc_npqtail = m0; 849 m0->m_nextpkt = NULL; 850 sc->sc_npqtail = &m0->m_nextpkt; 851 } else { 852 if ((m0->m_flags & M_HIGHPRI) 853 #ifdef ALTQ 854 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 855 #endif 856 ) { 857 ifq = &sc->sc_fastq; 858 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 859 IF_DROP(ifq); 860 m_freem(m0); 861 error = ENOBUFS; 862 } 863 else { 864 IF_ENQUEUE(ifq, m0); 865 error = 0; 866 } 867 } else 868 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, NULL, error); 869 if (error) { 870 splx(s); 871 sc->sc_if.if_oerrors++; 872 sc->sc_stats.ppp_oerrors++; 873 return (error); 874 } 875 (*sc->sc_start)(sc); 876 } 877 ifp->if_opackets++; 878 ifp->if_obytes += len; 879 880 splx(s); 881 return (0); 882 883 bad: 884 m_freem(m0); 885 return (error); 886 } 887 888 /* 889 * After a change in the NPmode for some NP, move packets from the 890 * npqueue to the send queue or the fast queue as appropriate. 891 * Should be called at splsoftnet. 892 */ 893 static void 894 ppp_requeue(sc) 895 struct ppp_softc *sc; 896 { 897 struct mbuf *m, **mpp; 898 struct ifqueue *ifq; 899 enum NPmode mode; 900 int error; 901 902 splsoftassert(IPL_SOFTNET); 903 904 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 905 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 906 case PPP_IP: 907 mode = sc->sc_npmode[NP_IP]; 908 break; 909 default: 910 mode = NPMODE_PASS; 911 } 912 913 switch (mode) { 914 case NPMODE_PASS: 915 /* 916 * This packet can now go on one of the queues to be sent. 917 */ 918 *mpp = m->m_nextpkt; 919 m->m_nextpkt = NULL; 920 if ((m->m_flags & M_HIGHPRI) 921 #ifdef ALTQ 922 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 923 #endif 924 ) { 925 ifq = &sc->sc_fastq; 926 if (IF_QFULL(ifq)) { 927 IF_DROP(ifq); 928 m_freem(m); 929 error = ENOBUFS; 930 } 931 else { 932 IF_ENQUEUE(ifq, m); 933 error = 0; 934 } 935 } else 936 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 937 if (error) { 938 sc->sc_if.if_oerrors++; 939 sc->sc_stats.ppp_oerrors++; 940 } 941 break; 942 943 case NPMODE_DROP: 944 case NPMODE_ERROR: 945 *mpp = m->m_nextpkt; 946 m_freem(m); 947 break; 948 949 case NPMODE_QUEUE: 950 mpp = &m->m_nextpkt; 951 break; 952 } 953 } 954 sc->sc_npqtail = mpp; 955 } 956 957 /* 958 * Transmitter has finished outputting some stuff; 959 * remember to call sc->sc_start later at splsoftnet. 960 */ 961 void 962 ppp_restart(sc) 963 struct ppp_softc *sc; 964 { 965 int s = splnet(); 966 967 sc->sc_flags &= ~SC_TBUSY; 968 schednetisr(NETISR_PPP); 969 splx(s); 970 } 971 972 /* 973 * Get a packet to send. This procedure is intended to be called at 974 * splsoftnet, since it may involve time-consuming operations such as 975 * applying VJ compression, packet compression, address/control and/or 976 * protocol field compression to the packet. 977 */ 978 struct mbuf * 979 ppp_dequeue(sc) 980 struct ppp_softc *sc; 981 { 982 struct mbuf *m, *mp; 983 u_char *cp; 984 int address, control, protocol; 985 986 /* 987 * Grab a packet to send: first try the fast queue, then the 988 * normal queue. 989 */ 990 IF_DEQUEUE(&sc->sc_fastq, m); 991 if (m == NULL) 992 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 993 if (m == NULL) 994 return NULL; 995 996 ++sc->sc_stats.ppp_opackets; 997 998 /* 999 * Extract the ppp header of the new packet. 1000 * The ppp header will be in one mbuf. 1001 */ 1002 cp = mtod(m, u_char *); 1003 address = PPP_ADDRESS(cp); 1004 control = PPP_CONTROL(cp); 1005 protocol = PPP_PROTOCOL(cp); 1006 1007 switch (protocol) { 1008 case PPP_IP: 1009 #ifdef VJC 1010 /* 1011 * If the packet is a TCP/IP packet, see if we can compress it. 1012 */ 1013 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1014 struct ip *ip; 1015 int type; 1016 1017 mp = m; 1018 ip = (struct ip *) (cp + PPP_HDRLEN); 1019 if (mp->m_len <= PPP_HDRLEN) { 1020 mp = mp->m_next; 1021 if (mp == NULL) 1022 break; 1023 ip = mtod(mp, struct ip *); 1024 } 1025 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1026 if (ip->ip_p == IPPROTO_TCP) { 1027 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1028 !(sc->sc_flags & SC_NO_TCP_CCID)); 1029 switch (type) { 1030 case TYPE_UNCOMPRESSED_TCP: 1031 protocol = PPP_VJC_UNCOMP; 1032 break; 1033 case TYPE_COMPRESSED_TCP: 1034 protocol = PPP_VJC_COMP; 1035 cp = mtod(m, u_char *); 1036 cp[0] = address; /* header has moved */ 1037 cp[1] = control; 1038 cp[2] = 0; 1039 break; 1040 } 1041 cp[3] = protocol; /* update protocol in PPP header */ 1042 } 1043 } 1044 #endif /* VJC */ 1045 break; 1046 1047 #ifdef PPP_COMPRESS 1048 case PPP_CCP: 1049 ppp_ccp(sc, m, 0); 1050 break; 1051 #endif /* PPP_COMPRESS */ 1052 } 1053 1054 #ifdef PPP_COMPRESS 1055 if (protocol != PPP_LCP && protocol != PPP_CCP 1056 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1057 struct mbuf *mcomp = NULL; 1058 int slen; 1059 1060 slen = 0; 1061 for (mp = m; mp != NULL; mp = mp->m_next) 1062 slen += mp->m_len; 1063 (*sc->sc_xcomp->compress) 1064 (sc->sc_xc_state, &mcomp, m, slen, 1065 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 1066 if (mcomp != NULL) { 1067 if (sc->sc_flags & SC_CCP_UP) { 1068 /* Send the compressed packet instead of the original. */ 1069 m_freem(m); 1070 m = mcomp; 1071 cp = mtod(m, u_char *); 1072 protocol = cp[3]; 1073 } else { 1074 /* Can't transmit compressed packets until CCP is up. */ 1075 m_freem(mcomp); 1076 } 1077 } 1078 } 1079 #endif /* PPP_COMPRESS */ 1080 1081 /* 1082 * Compress the address/control and protocol, if possible. 1083 */ 1084 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1085 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1086 protocol != PPP_LCP) { 1087 /* can compress address/control */ 1088 m->m_data += 2; 1089 m->m_len -= 2; 1090 } 1091 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1092 /* can compress protocol */ 1093 if (mtod(m, u_char *) == cp) { 1094 cp[2] = cp[1]; /* move address/control up */ 1095 cp[1] = cp[0]; 1096 } 1097 ++m->m_data; 1098 --m->m_len; 1099 } 1100 1101 return m; 1102 } 1103 1104 /* 1105 * Software interrupt routine, called at splsoftnet. 1106 */ 1107 void 1108 pppintr() 1109 { 1110 struct ppp_softc *sc; 1111 int s, s2; 1112 struct mbuf *m; 1113 1114 splsoftassert(IPL_SOFTNET); 1115 1116 s = splsoftnet(); /* XXX - what's the point of this? see comment above */ 1117 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1118 if (!(sc->sc_flags & SC_TBUSY) 1119 && (!IFQ_IS_EMPTY(&sc->sc_if.if_snd) || 1120 !IFQ_IS_EMPTY(&sc->sc_fastq))) { 1121 s2 = splnet(); 1122 sc->sc_flags |= SC_TBUSY; 1123 splx(s2); 1124 (*sc->sc_start)(sc); 1125 } 1126 while (!IFQ_IS_EMPTY(&sc->sc_rawq)) { 1127 s2 = splnet(); 1128 IF_DEQUEUE(&sc->sc_rawq, m); 1129 splx(s2); 1130 if (m == NULL) 1131 break; 1132 ppp_inproc(sc, m); 1133 } 1134 } 1135 splx(s); 1136 } 1137 1138 #ifdef PPP_COMPRESS 1139 /* 1140 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1141 * 0 if it is about to be transmitted. 1142 */ 1143 static void 1144 ppp_ccp(sc, m, rcvd) 1145 struct ppp_softc *sc; 1146 struct mbuf *m; 1147 int rcvd; 1148 { 1149 u_char *dp, *ep; 1150 struct mbuf *mp; 1151 int slen, s; 1152 1153 /* 1154 * Get a pointer to the data after the PPP header. 1155 */ 1156 if (m->m_len <= PPP_HDRLEN) { 1157 mp = m->m_next; 1158 if (mp == NULL) 1159 return; 1160 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1161 } else { 1162 mp = m; 1163 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1164 } 1165 1166 ep = mtod(mp, u_char *) + mp->m_len; 1167 if (dp + CCP_HDRLEN > ep) 1168 return; 1169 slen = CCP_LENGTH(dp); 1170 if (dp + slen > ep) { 1171 if (sc->sc_flags & SC_DEBUG) 1172 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1173 dp, slen, mtod(mp, u_char *), mp->m_len); 1174 return; 1175 } 1176 1177 switch (CCP_CODE(dp)) { 1178 case CCP_CONFREQ: 1179 case CCP_TERMREQ: 1180 case CCP_TERMACK: 1181 /* CCP must be going down - disable compression */ 1182 if (sc->sc_flags & SC_CCP_UP) { 1183 s = splnet(); 1184 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1185 splx(s); 1186 } 1187 break; 1188 1189 case CCP_CONFACK: 1190 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1191 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1192 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1193 if (!rcvd) { 1194 /* we're agreeing to send compressed packets. */ 1195 if (sc->sc_xc_state != NULL 1196 && (*sc->sc_xcomp->comp_init) 1197 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1198 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1199 s = splnet(); 1200 sc->sc_flags |= SC_COMP_RUN; 1201 splx(s); 1202 } 1203 } else { 1204 /* peer is agreeing to send compressed packets. */ 1205 if (sc->sc_rc_state != NULL 1206 && (*sc->sc_rcomp->decomp_init) 1207 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1208 sc->sc_unit, 0, sc->sc_mru, 1209 sc->sc_flags & SC_DEBUG)) { 1210 s = splnet(); 1211 sc->sc_flags |= SC_DECOMP_RUN; 1212 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1213 splx(s); 1214 } 1215 } 1216 } 1217 break; 1218 1219 case CCP_RESETACK: 1220 if (sc->sc_flags & SC_CCP_UP) { 1221 if (!rcvd) { 1222 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1223 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1224 } else { 1225 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1226 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1227 s = splnet(); 1228 sc->sc_flags &= ~SC_DC_ERROR; 1229 splx(s); 1230 } 1231 } 1232 } 1233 break; 1234 } 1235 } 1236 1237 /* 1238 * CCP is down; free (de)compressor state if necessary. 1239 */ 1240 static void 1241 ppp_ccp_closed(sc) 1242 struct ppp_softc *sc; 1243 { 1244 if (sc->sc_xc_state) { 1245 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1246 sc->sc_xc_state = NULL; 1247 } 1248 if (sc->sc_rc_state) { 1249 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1250 sc->sc_rc_state = NULL; 1251 } 1252 } 1253 #endif /* PPP_COMPRESS */ 1254 1255 /* 1256 * PPP packet input routine. 1257 * The caller has checked and removed the FCS and has inserted 1258 * the address/control bytes and the protocol high byte if they 1259 * were omitted. 1260 */ 1261 void 1262 ppppktin(sc, m, lost) 1263 struct ppp_softc *sc; 1264 struct mbuf *m; 1265 int lost; 1266 { 1267 int s = splnet(); 1268 1269 if (lost) 1270 m->m_flags |= M_ERRMARK; 1271 IF_ENQUEUE(&sc->sc_rawq, m); 1272 schednetisr(NETISR_PPP); 1273 splx(s); 1274 } 1275 1276 /* 1277 * Process a received PPP packet, doing decompression as necessary. 1278 * Should be called at splsoftnet. 1279 */ 1280 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1281 TYPE_UNCOMPRESSED_TCP) 1282 1283 static void 1284 ppp_inproc(sc, m) 1285 struct ppp_softc *sc; 1286 struct mbuf *m; 1287 { 1288 struct ifnet *ifp = &sc->sc_if; 1289 struct ifqueue *inq; 1290 int s, ilen, xlen, proto, rv; 1291 u_char *cp, adrs, ctrl; 1292 struct mbuf *mp, *dmp = NULL; 1293 u_char *iphdr; 1294 u_int hlen; 1295 1296 sc->sc_stats.ppp_ipackets++; 1297 1298 if (sc->sc_flags & SC_LOG_INPKT) { 1299 ilen = 0; 1300 for (mp = m; mp != NULL; mp = mp->m_next) 1301 ilen += mp->m_len; 1302 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1303 pppdumpm(m); 1304 } 1305 1306 cp = mtod(m, u_char *); 1307 adrs = PPP_ADDRESS(cp); 1308 ctrl = PPP_CONTROL(cp); 1309 proto = PPP_PROTOCOL(cp); 1310 1311 if (m->m_flags & M_ERRMARK) { 1312 m->m_flags &= ~M_ERRMARK; 1313 s = splnet(); 1314 sc->sc_flags |= SC_VJ_RESET; 1315 splx(s); 1316 } 1317 1318 #ifdef PPP_COMPRESS 1319 /* 1320 * Decompress this packet if necessary, update the receiver's 1321 * dictionary, or take appropriate action on a CCP packet. 1322 */ 1323 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1324 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1325 /* decompress this packet */ 1326 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1327 if (rv == DECOMP_OK) { 1328 m_freem(m); 1329 if (dmp == NULL) { 1330 /* no error, but no decompressed packet produced */ 1331 return; 1332 } 1333 m = dmp; 1334 cp = mtod(m, u_char *); 1335 proto = PPP_PROTOCOL(cp); 1336 1337 } else { 1338 /* 1339 * An error has occurred in decompression. 1340 * Pass the compressed packet up to pppd, which may take 1341 * CCP down or issue a Reset-Req. 1342 */ 1343 if (sc->sc_flags & SC_DEBUG) 1344 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1345 s = splnet(); 1346 sc->sc_flags |= SC_VJ_RESET; 1347 if (rv == DECOMP_ERROR) 1348 sc->sc_flags |= SC_DC_ERROR; 1349 else 1350 sc->sc_flags |= SC_DC_FERROR; 1351 splx(s); 1352 } 1353 1354 } else { 1355 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1356 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1357 } 1358 if (proto == PPP_CCP) { 1359 ppp_ccp(sc, m, 1); 1360 } 1361 } 1362 #endif 1363 1364 ilen = 0; 1365 for (mp = m; mp != NULL; mp = mp->m_next) 1366 ilen += mp->m_len; 1367 1368 #ifdef VJC 1369 if (sc->sc_flags & SC_VJ_RESET) { 1370 /* 1371 * If we've missed a packet, we must toss subsequent compressed 1372 * packets which don't have an explicit connection ID. 1373 */ 1374 if (sc->sc_comp) 1375 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1376 s = splnet(); 1377 sc->sc_flags &= ~SC_VJ_RESET; 1378 splx(s); 1379 } 1380 1381 /* 1382 * See if we have a VJ-compressed packet to uncompress. 1383 */ 1384 if (proto == PPP_VJC_COMP) { 1385 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1386 goto bad; 1387 1388 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1389 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1390 sc->sc_comp, &iphdr, &hlen); 1391 1392 if (xlen <= 0) { 1393 if (sc->sc_flags & SC_DEBUG) 1394 printf("%s: VJ uncompress failed on type comp\n", 1395 ifp->if_xname); 1396 goto bad; 1397 } 1398 1399 /* Copy the PPP and IP headers into a new mbuf. */ 1400 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1401 if (mp == NULL) 1402 goto bad; 1403 mp->m_len = 0; 1404 mp->m_next = NULL; 1405 if (hlen + PPP_HDRLEN > MHLEN) { 1406 MCLGET(mp, M_DONTWAIT); 1407 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1408 m_freem(mp); 1409 goto bad; /* lose if big headers and no clusters */ 1410 } 1411 } 1412 if (m->m_flags & M_PKTHDR) 1413 M_MOVE_HDR(mp, m); 1414 cp = mtod(mp, u_char *); 1415 cp[0] = adrs; 1416 cp[1] = ctrl; 1417 cp[2] = 0; 1418 cp[3] = PPP_IP; 1419 proto = PPP_IP; 1420 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1421 mp->m_len = hlen + PPP_HDRLEN; 1422 1423 /* 1424 * Trim the PPP and VJ headers off the old mbuf 1425 * and stick the new and old mbufs together. 1426 */ 1427 m->m_data += PPP_HDRLEN + xlen; 1428 m->m_len -= PPP_HDRLEN + xlen; 1429 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1430 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1431 mp->m_len += m->m_len; 1432 MFREE(m, mp->m_next); 1433 } else 1434 mp->m_next = m; 1435 m = mp; 1436 ilen += hlen - xlen; 1437 1438 } else if (proto == PPP_VJC_UNCOMP) { 1439 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1440 goto bad; 1441 1442 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1443 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1444 sc->sc_comp, &iphdr, &hlen); 1445 1446 if (xlen < 0) { 1447 if (sc->sc_flags & SC_DEBUG) 1448 printf("%s: VJ uncompress failed on type uncomp\n", 1449 ifp->if_xname); 1450 goto bad; 1451 } 1452 1453 proto = PPP_IP; 1454 cp[3] = PPP_IP; 1455 } 1456 #endif /* VJC */ 1457 1458 /* 1459 * If the packet will fit in a header mbuf, don't waste a 1460 * whole cluster on it. 1461 */ 1462 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1463 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1464 if (mp != NULL) { 1465 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1466 m_freem(m); 1467 m = mp; 1468 m->m_len = ilen; 1469 } 1470 } 1471 m->m_pkthdr.len = ilen; 1472 m->m_pkthdr.rcvif = ifp; 1473 1474 /* mark incoming routing domain */ 1475 m->m_pkthdr.rdomain = ifp->if_rdomain; 1476 1477 if ((proto & 0x8000) == 0) { 1478 #if NBPFILTER > 0 1479 /* 1480 * See whether we want to pass this packet, and 1481 * if it counts as link activity. 1482 */ 1483 adrs = *mtod(m, u_char *); /* save address field */ 1484 *mtod(m, u_char *) = 0; /* indicate inbound */ 1485 if (sc->sc_pass_filt.bf_insns != 0 1486 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1487 ilen, 0) == 0) { 1488 /* drop this packet */ 1489 m_freem(m); 1490 return; 1491 } 1492 if (sc->sc_active_filt.bf_insns == 0 1493 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1494 sc->sc_last_recv = time_second; 1495 1496 *mtod(m, u_char *) = adrs; 1497 #else 1498 /* 1499 * Record the time that we received this packet. 1500 */ 1501 sc->sc_last_recv = time_second; 1502 #endif 1503 } 1504 1505 #if NBPFILTER > 0 1506 /* See if bpf wants to look at the packet. */ 1507 if (sc->sc_bpf) 1508 bpf_mtap(sc->sc_bpf, m, BPF_DIRECTION_IN); 1509 #endif 1510 1511 rv = 0; 1512 switch (proto) { 1513 #ifdef INET 1514 case PPP_IP: 1515 /* 1516 * IP packet - take off the ppp header and pass it up to IP. 1517 */ 1518 if ((ifp->if_flags & IFF_UP) == 0 1519 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1520 /* interface is down - drop the packet. */ 1521 m_freem(m); 1522 return; 1523 } 1524 m->m_pkthdr.len -= PPP_HDRLEN; 1525 m->m_data += PPP_HDRLEN; 1526 m->m_len -= PPP_HDRLEN; 1527 schednetisr(NETISR_IP); 1528 inq = &ipintrq; 1529 break; 1530 #endif 1531 1532 default: 1533 /* 1534 * Some other protocol - place on input queue for read(). 1535 */ 1536 inq = &sc->sc_inq; 1537 rv = 1; 1538 break; 1539 } 1540 1541 /* 1542 * Put the packet on the appropriate input queue. 1543 */ 1544 s = splnet(); 1545 if (IF_QFULL(inq)) { 1546 IF_DROP(inq); 1547 splx(s); 1548 if (sc->sc_flags & SC_DEBUG) 1549 printf("%s: input queue full\n", ifp->if_xname); 1550 ifp->if_iqdrops++; 1551 if (!inq->ifq_congestion) 1552 if_congestion(inq); 1553 goto bad; 1554 } 1555 IF_ENQUEUE(inq, m); 1556 splx(s); 1557 ifp->if_ipackets++; 1558 ifp->if_ibytes += ilen; 1559 1560 if (rv) 1561 (*sc->sc_ctlp)(sc); 1562 1563 return; 1564 1565 bad: 1566 m_freem(m); 1567 sc->sc_if.if_ierrors++; 1568 sc->sc_stats.ppp_ierrors++; 1569 } 1570 1571 #define MAX_DUMP_BYTES 128 1572 1573 static void 1574 pppdumpm(m0) 1575 struct mbuf *m0; 1576 { 1577 char buf[3*MAX_DUMP_BYTES+4]; 1578 char *bp = buf; 1579 struct mbuf *m; 1580 static char digits[] = "0123456789abcdef"; 1581 1582 for (m = m0; m; m = m->m_next) { 1583 int l = m->m_len; 1584 u_char *rptr = mtod(m, u_char *); 1585 1586 while (l--) { 1587 if (bp > buf + sizeof(buf) - 4) 1588 goto done; 1589 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1590 *bp++ = digits[*rptr++ & 0xf]; 1591 } 1592 1593 if (m->m_next) { 1594 if (bp > buf + sizeof(buf) - 3) 1595 goto done; 1596 *bp++ = '|'; 1597 } else 1598 *bp++ = ' '; 1599 } 1600 done: 1601 if (m) 1602 *bp++ = '>'; 1603 *bp = 0; 1604 printf("%s\n", buf); 1605 } 1606 1607 static void 1608 ppp_ifstart(ifp) 1609 struct ifnet *ifp; 1610 { 1611 struct ppp_softc *sc; 1612 1613 sc = ifp->if_softc; 1614 (*sc->sc_start)(sc); 1615 } 1616 #endif /* NPPP > 0 */ 1617