1 /* $OpenBSD: if_ppp.c,v 1.53 2009/03/15 19:40:41 miod 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 #ifdef ALTQ 167 static void ppp_ifstart(struct ifnet *ifp); 168 #endif 169 int ppp_clone_create(struct if_clone *, int); 170 int ppp_clone_destroy(struct ifnet *); 171 172 /* 173 * Some useful mbuf macros not in mbuf.h. 174 */ 175 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 176 177 #define M_DATASTART(m) \ 178 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 179 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 180 181 #define M_DATASIZE(m) \ 182 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 183 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 184 185 /* 186 * We steal two bits in the mbuf m_flags, to mark high-priority packets 187 * for output, and received packets following lost/corrupted packets. 188 */ 189 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 190 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 191 192 193 #ifdef PPP_COMPRESS 194 /* 195 * List of compressors we know about. 196 * We leave some space so maybe we can modload compressors. 197 */ 198 199 extern struct compressor ppp_bsd_compress; 200 extern struct compressor ppp_deflate, ppp_deflate_draft; 201 202 struct compressor *ppp_compressors[8] = { 203 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 204 &ppp_bsd_compress, 205 #endif 206 #if DO_DEFLATE && defined(PPP_DEFLATE) 207 &ppp_deflate, 208 &ppp_deflate_draft, 209 #endif 210 NULL 211 }; 212 #endif /* PPP_COMPRESS */ 213 214 LIST_HEAD(, ppp_softc) ppp_softc_list; 215 struct if_clone ppp_cloner = 216 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 217 218 /* 219 * Called from boot code to establish ppp interfaces. 220 */ 221 void 222 pppattach() 223 { 224 LIST_INIT(&ppp_softc_list); 225 if_clone_attach(&ppp_cloner); 226 } 227 228 int 229 ppp_clone_create(ifc, unit) 230 struct if_clone *ifc; 231 int unit; 232 { 233 struct ppp_softc *sc; 234 int s; 235 236 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); 237 if (!sc) 238 return (ENOMEM); 239 240 sc->sc_unit = unit; 241 snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d", 242 ifc->ifc_name, unit); 243 sc->sc_if.if_softc = sc; 244 sc->sc_if.if_mtu = PPP_MTU; 245 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 246 sc->sc_if.if_type = IFT_PPP; 247 sc->sc_if.if_hdrlen = PPP_HDRLEN; 248 sc->sc_if.if_ioctl = pppsioctl; 249 sc->sc_if.if_output = pppoutput; 250 #ifdef ALTQ 251 sc->sc_if.if_start = ppp_ifstart; 252 #endif 253 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, ifqmaxlen); 254 sc->sc_inq.ifq_maxlen = ifqmaxlen; 255 sc->sc_fastq.ifq_maxlen = ifqmaxlen; 256 sc->sc_rawq.ifq_maxlen = ifqmaxlen; 257 IFQ_SET_READY(&sc->sc_if.if_snd); 258 if_attach(&sc->sc_if); 259 if_alloc_sadl(&sc->sc_if); 260 #if NBPFILTER > 0 261 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 262 #endif 263 s = splnet(); 264 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 265 splx(s); 266 267 return (0); 268 } 269 270 int 271 ppp_clone_destroy(ifp) 272 struct ifnet *ifp; 273 { 274 struct ppp_softc *sc = ifp->if_softc; 275 int s; 276 277 if (sc->sc_devp != NULL) 278 return (EBUSY); 279 280 s = splnet(); 281 LIST_REMOVE(sc, sc_list); 282 splx(s); 283 284 if_detach(ifp); 285 286 free(sc, M_DEVBUF); 287 return (0); 288 } 289 290 /* 291 * Allocate a ppp interface unit and initialize it. 292 */ 293 struct ppp_softc * 294 pppalloc(pid) 295 pid_t pid; 296 { 297 int i; 298 struct ppp_softc *sc; 299 300 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 301 if (sc->sc_xfer == pid) { 302 sc->sc_xfer = 0; 303 return sc; 304 } 305 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 306 if (sc->sc_devp == NULL) 307 break; 308 if (sc == NULL) 309 return NULL; 310 311 sc->sc_flags = 0; 312 sc->sc_mru = PPP_MRU; 313 sc->sc_relinq = NULL; 314 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 315 #ifdef VJC 316 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 317 if (sc->sc_comp) 318 sl_compress_init(sc->sc_comp); 319 #endif 320 #ifdef PPP_COMPRESS 321 sc->sc_xc_state = NULL; 322 sc->sc_rc_state = NULL; 323 #endif /* PPP_COMPRESS */ 324 for (i = 0; i < NUM_NP; ++i) 325 sc->sc_npmode[i] = NPMODE_ERROR; 326 sc->sc_npqueue = NULL; 327 sc->sc_npqtail = &sc->sc_npqueue; 328 sc->sc_last_sent = sc->sc_last_recv = time_second; 329 330 return sc; 331 } 332 333 /* 334 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 335 */ 336 void 337 pppdealloc(sc) 338 struct ppp_softc *sc; 339 { 340 struct mbuf *m; 341 342 splsoftassert(IPL_SOFTNET); 343 344 if_down(&sc->sc_if); 345 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 346 sc->sc_devp = NULL; 347 sc->sc_xfer = 0; 348 for (;;) { 349 IF_DEQUEUE(&sc->sc_rawq, m); 350 if (m == NULL) 351 break; 352 m_freem(m); 353 } 354 for (;;) { 355 IF_DEQUEUE(&sc->sc_inq, m); 356 if (m == NULL) 357 break; 358 m_freem(m); 359 } 360 for (;;) { 361 IF_DEQUEUE(&sc->sc_fastq, m); 362 if (m == NULL) 363 break; 364 m_freem(m); 365 } 366 while ((m = sc->sc_npqueue) != NULL) { 367 sc->sc_npqueue = m->m_nextpkt; 368 m_freem(m); 369 } 370 if (sc->sc_togo != NULL) { 371 m_freem(sc->sc_togo); 372 sc->sc_togo = NULL; 373 } 374 #ifdef PPP_COMPRESS 375 ppp_ccp_closed(sc); 376 sc->sc_xc_state = NULL; 377 sc->sc_rc_state = NULL; 378 #endif /* PPP_COMPRESS */ 379 #if NBPFILTER > 0 380 if (sc->sc_pass_filt.bf_insns != 0) { 381 free(sc->sc_pass_filt.bf_insns, M_DEVBUF); 382 sc->sc_pass_filt.bf_insns = 0; 383 sc->sc_pass_filt.bf_len = 0; 384 } 385 if (sc->sc_active_filt.bf_insns != 0) { 386 free(sc->sc_active_filt.bf_insns, M_DEVBUF); 387 sc->sc_active_filt.bf_insns = 0; 388 sc->sc_active_filt.bf_len = 0; 389 } 390 #endif 391 #ifdef VJC 392 if (sc->sc_comp != 0) { 393 free(sc->sc_comp, M_DEVBUF); 394 sc->sc_comp = 0; 395 } 396 #endif 397 } 398 399 /* 400 * Ioctl routine for generic ppp devices. 401 */ 402 int 403 pppioctl(sc, cmd, data, flag, p) 404 struct ppp_softc *sc; 405 u_long cmd; 406 caddr_t data; 407 int flag; 408 struct proc *p; 409 { 410 int s, error, flags, mru, npx; 411 u_int nb; 412 struct ppp_option_data *odp; 413 struct compressor **cp; 414 struct npioctl *npi; 415 time_t t; 416 #if NBPFILTER > 0 417 struct bpf_program *bp, *nbp; 418 struct bpf_insn *newcode, *oldcode; 419 int newcodelen; 420 #endif 421 #ifdef PPP_COMPRESS 422 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 423 #endif 424 425 switch (cmd) { 426 case FIONREAD: 427 *(int *)data = sc->sc_inq.ifq_len; 428 break; 429 430 case PPPIOCGUNIT: 431 *(int *)data = sc->sc_unit; /* XXX */ 432 break; 433 434 case PPPIOCGFLAGS: 435 *(u_int *)data = sc->sc_flags; 436 break; 437 438 case PPPIOCSFLAGS: 439 if ((error = suser(p, 0)) != 0) 440 return (error); 441 flags = *(int *)data & SC_MASK; 442 s = splsoftnet(); 443 #ifdef PPP_COMPRESS 444 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 445 ppp_ccp_closed(sc); 446 #endif 447 splnet(); 448 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 449 splx(s); 450 break; 451 452 case PPPIOCSMRU: 453 if ((error = suser(p, 0)) != 0) 454 return (error); 455 mru = *(int *)data; 456 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 457 sc->sc_mru = mru; 458 break; 459 460 case PPPIOCGMRU: 461 *(int *)data = sc->sc_mru; 462 break; 463 464 #ifdef VJC 465 case PPPIOCSMAXCID: 466 if ((error = suser(p, 0)) != 0) 467 return (error); 468 if (sc->sc_comp) { 469 s = splsoftnet(); 470 sl_compress_setup(sc->sc_comp, *(int *)data); 471 splx(s); 472 } 473 break; 474 #endif 475 476 case PPPIOCXFERUNIT: 477 if ((error = suser(p, 0)) != 0) 478 return (error); 479 sc->sc_xfer = p->p_pid; 480 break; 481 482 #ifdef PPP_COMPRESS 483 case PPPIOCSCOMPRESS: 484 if ((error = suser(p, 0)) != 0) 485 return (error); 486 odp = (struct ppp_option_data *) data; 487 nb = odp->length; 488 if (nb > sizeof(ccp_option)) 489 nb = sizeof(ccp_option); 490 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 491 return (error); 492 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 493 return (EINVAL); 494 for (cp = ppp_compressors; *cp != NULL; ++cp) 495 if ((*cp)->compress_proto == ccp_option[0]) { 496 /* 497 * Found a handler for the protocol - try to allocate 498 * a compressor or decompressor. 499 */ 500 error = 0; 501 if (odp->transmit) { 502 s = splsoftnet(); 503 if (sc->sc_xc_state != NULL) 504 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 505 sc->sc_xcomp = *cp; 506 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 507 if (sc->sc_xc_state == NULL) { 508 if (sc->sc_flags & SC_DEBUG) 509 printf("%s: comp_alloc failed\n", 510 sc->sc_if.if_xname); 511 error = ENOBUFS; 512 } 513 splnet(); 514 sc->sc_flags &= ~SC_COMP_RUN; 515 splx(s); 516 } else { 517 s = splsoftnet(); 518 if (sc->sc_rc_state != NULL) 519 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 520 sc->sc_rcomp = *cp; 521 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 522 if (sc->sc_rc_state == NULL) { 523 if (sc->sc_flags & SC_DEBUG) 524 printf("%s: decomp_alloc failed\n", 525 sc->sc_if.if_xname); 526 error = ENOBUFS; 527 } 528 splnet(); 529 sc->sc_flags &= ~SC_DECOMP_RUN; 530 splx(s); 531 } 532 return (error); 533 } 534 if (sc->sc_flags & SC_DEBUG) 535 printf("%s: no compressor for [%x %x %x], %x\n", 536 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 537 ccp_option[2], nb); 538 return (EINVAL); /* no handler found */ 539 #endif /* PPP_COMPRESS */ 540 541 case PPPIOCGNPMODE: 542 case PPPIOCSNPMODE: 543 npi = (struct npioctl *) data; 544 switch (npi->protocol) { 545 case PPP_IP: 546 npx = NP_IP; 547 break; 548 default: 549 return EINVAL; 550 } 551 if (cmd == PPPIOCGNPMODE) { 552 npi->mode = sc->sc_npmode[npx]; 553 } else { 554 if ((error = suser(p, 0)) != 0) 555 return (error); 556 if (npi->mode != sc->sc_npmode[npx]) { 557 s = splsoftnet(); 558 sc->sc_npmode[npx] = npi->mode; 559 if (npi->mode != NPMODE_QUEUE) { 560 ppp_requeue(sc); 561 (*sc->sc_start)(sc); 562 } 563 splx(s); 564 } 565 } 566 break; 567 568 case PPPIOCGIDLE: 569 s = splsoftnet(); 570 t = time_second; 571 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 572 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 573 splx(s); 574 break; 575 576 #if NBPFILTER > 0 577 case PPPIOCSPASS: 578 case PPPIOCSACTIVE: 579 nbp = (struct bpf_program *) data; 580 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 581 return EINVAL; 582 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 583 if (newcodelen != 0) { 584 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 585 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 586 newcodelen)) != 0) { 587 free(newcode, M_DEVBUF); 588 return error; 589 } 590 if (!bpf_validate(newcode, nbp->bf_len)) { 591 free(newcode, M_DEVBUF); 592 return EINVAL; 593 } 594 } else 595 newcode = 0; 596 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 597 oldcode = bp->bf_insns; 598 s = splnet(); 599 bp->bf_len = nbp->bf_len; 600 bp->bf_insns = newcode; 601 splx(s); 602 if (oldcode != 0) 603 free(oldcode, M_DEVBUF); 604 break; 605 #endif 606 607 default: 608 return (-1); 609 } 610 return (0); 611 } 612 613 /* 614 * Process an ioctl request to the ppp network interface. 615 */ 616 static int 617 pppsioctl(ifp, cmd, data) 618 struct ifnet *ifp; 619 u_long cmd; 620 caddr_t data; 621 { 622 struct ppp_softc *sc = ifp->if_softc; 623 struct ifaddr *ifa = (struct ifaddr *)data; 624 struct ifreq *ifr = (struct ifreq *)data; 625 struct ppp_stats *psp; 626 #ifdef PPP_COMPRESS 627 struct ppp_comp_stats *pcp; 628 #endif 629 int s = splnet(), error = 0; 630 631 switch (cmd) { 632 case SIOCSIFFLAGS: 633 if ((ifp->if_flags & IFF_RUNNING) == 0) 634 ifp->if_flags &= ~IFF_UP; 635 break; 636 637 case SIOCSIFADDR: 638 if (ifa->ifa_addr->sa_family != AF_INET) 639 error = EAFNOSUPPORT; 640 break; 641 642 case SIOCSIFDSTADDR: 643 if (ifa->ifa_addr->sa_family != AF_INET) 644 error = EAFNOSUPPORT; 645 break; 646 647 case SIOCSIFMTU: 648 sc->sc_if.if_mtu = ifr->ifr_mtu; 649 break; 650 651 case SIOCADDMULTI: 652 case SIOCDELMULTI: 653 if (ifr == 0) { 654 error = EAFNOSUPPORT; 655 break; 656 } 657 switch(ifr->ifr_addr.sa_family) { 658 #ifdef INET 659 case AF_INET: 660 break; 661 #endif 662 default: 663 error = EAFNOSUPPORT; 664 break; 665 } 666 break; 667 668 case SIOCGPPPSTATS: 669 psp = &((struct ifpppstatsreq *) data)->stats; 670 bzero(psp, sizeof(*psp)); 671 psp->p = sc->sc_stats; 672 #if defined(VJC) && !defined(SL_NO_STATS) 673 if (sc->sc_comp) { 674 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 675 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 676 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 677 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 678 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 679 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 680 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 681 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 682 } 683 #endif /* VJC */ 684 break; 685 686 #ifdef PPP_COMPRESS 687 case SIOCGPPPCSTATS: 688 pcp = &((struct ifpppcstatsreq *) data)->stats; 689 bzero(pcp, sizeof(*pcp)); 690 if (sc->sc_xc_state != NULL) 691 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 692 if (sc->sc_rc_state != NULL) 693 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 694 break; 695 #endif /* PPP_COMPRESS */ 696 697 default: 698 error = EINVAL; 699 } 700 splx(s); 701 return (error); 702 } 703 704 /* 705 * Queue a packet. Start transmission if not active. 706 * Packet is placed in Information field of PPP frame. 707 */ 708 int 709 pppoutput(ifp, m0, dst, rtp) 710 struct ifnet *ifp; 711 struct mbuf *m0; 712 struct sockaddr *dst; 713 struct rtentry *rtp; 714 { 715 struct ppp_softc *sc = ifp->if_softc; 716 int protocol, address, control; 717 u_char *cp; 718 int s, error; 719 struct ip *ip; 720 struct ifqueue *ifq; 721 enum NPmode mode; 722 int len; 723 724 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 725 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 726 error = ENETDOWN; /* sort of */ 727 goto bad; 728 } 729 730 /* 731 * Compute PPP header. 732 */ 733 m0->m_flags &= ~M_HIGHPRI; 734 switch (dst->sa_family) { 735 #ifdef INET 736 case AF_INET: 737 address = PPP_ALLSTATIONS; 738 control = PPP_UI; 739 protocol = PPP_IP; 740 mode = sc->sc_npmode[NP_IP]; 741 742 /* 743 * If this packet has the "low delay" bit set in the IP header, 744 * put it on the fastq instead. 745 */ 746 ip = mtod(m0, struct ip *); 747 if (ip->ip_tos & IPTOS_LOWDELAY) 748 m0->m_flags |= M_HIGHPRI; 749 break; 750 #endif 751 case AF_UNSPEC: 752 address = PPP_ADDRESS(dst->sa_data); 753 control = PPP_CONTROL(dst->sa_data); 754 protocol = PPP_PROTOCOL(dst->sa_data); 755 mode = NPMODE_PASS; 756 break; 757 default: 758 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 759 error = EAFNOSUPPORT; 760 goto bad; 761 } 762 763 /* 764 * Drop this packet, or return an error, if necessary. 765 */ 766 if (mode == NPMODE_ERROR) { 767 error = ENETDOWN; 768 goto bad; 769 } 770 if (mode == NPMODE_DROP) { 771 error = 0; 772 goto bad; 773 } 774 775 /* 776 * Add PPP header. If no space in first mbuf, allocate another. 777 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 778 */ 779 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 780 if (m0 == 0) { 781 error = ENOBUFS; 782 goto bad; 783 } 784 785 cp = mtod(m0, u_char *); 786 *cp++ = address; 787 *cp++ = control; 788 *cp++ = protocol >> 8; 789 *cp++ = protocol & 0xff; 790 791 if ((m0->m_flags & M_PKTHDR) == 0) 792 panic("mbuf packet without packet header!"); 793 len = m0->m_pkthdr.len; 794 795 if (sc->sc_flags & SC_LOG_OUTPKT) { 796 printf("%s output: ", ifp->if_xname); 797 pppdumpm(m0); 798 } 799 800 if ((protocol & 0x8000) == 0) { 801 #if NBPFILTER > 0 802 /* 803 * Apply the pass and active filters to the packet, 804 * but only if it is a data packet. 805 */ 806 *mtod(m0, u_char *) = 1; /* indicates outbound */ 807 if (sc->sc_pass_filt.bf_insns != 0 808 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 809 len, 0) == 0) { 810 error = 0; /* drop this packet */ 811 goto bad; 812 } 813 814 /* 815 * Update the time we sent the most recent packet. 816 */ 817 if (sc->sc_active_filt.bf_insns == 0 818 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 819 sc->sc_last_sent = time_second; 820 821 *mtod(m0, u_char *) = address; 822 #else 823 /* 824 * Update the time we sent the most recent packet. 825 */ 826 sc->sc_last_sent = time_second; 827 #endif 828 } 829 830 #if NBPFILTER > 0 831 /* 832 * See if bpf wants to look at the packet. 833 */ 834 if (sc->sc_bpf) 835 bpf_mtap(sc->sc_bpf, m0, BPF_DIRECTION_OUT); 836 #endif 837 838 /* 839 * Put the packet on the appropriate queue. 840 */ 841 s = splsoftnet(); 842 if (mode == NPMODE_QUEUE) { 843 /* XXX we should limit the number of packets on this queue */ 844 *sc->sc_npqtail = m0; 845 m0->m_nextpkt = NULL; 846 sc->sc_npqtail = &m0->m_nextpkt; 847 } else { 848 if ((m0->m_flags & M_HIGHPRI) 849 #ifdef ALTQ 850 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 851 #endif 852 ) { 853 ifq = &sc->sc_fastq; 854 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 855 IF_DROP(ifq); 856 m_freem(m0); 857 error = ENOBUFS; 858 } 859 else { 860 IF_ENQUEUE(ifq, m0); 861 error = 0; 862 } 863 } else 864 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, NULL, error); 865 if (error) { 866 splx(s); 867 sc->sc_if.if_oerrors++; 868 sc->sc_stats.ppp_oerrors++; 869 return (error); 870 } 871 (*sc->sc_start)(sc); 872 } 873 ifp->if_opackets++; 874 ifp->if_obytes += len; 875 876 splx(s); 877 return (0); 878 879 bad: 880 m_freem(m0); 881 return (error); 882 } 883 884 /* 885 * After a change in the NPmode for some NP, move packets from the 886 * npqueue to the send queue or the fast queue as appropriate. 887 * Should be called at splsoftnet. 888 */ 889 static void 890 ppp_requeue(sc) 891 struct ppp_softc *sc; 892 { 893 struct mbuf *m, **mpp; 894 struct ifqueue *ifq; 895 enum NPmode mode; 896 int error; 897 898 splsoftassert(IPL_SOFTNET); 899 900 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 901 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 902 case PPP_IP: 903 mode = sc->sc_npmode[NP_IP]; 904 break; 905 default: 906 mode = NPMODE_PASS; 907 } 908 909 switch (mode) { 910 case NPMODE_PASS: 911 /* 912 * This packet can now go on one of the queues to be sent. 913 */ 914 *mpp = m->m_nextpkt; 915 m->m_nextpkt = NULL; 916 if ((m->m_flags & M_HIGHPRI) 917 #ifdef ALTQ 918 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 919 #endif 920 ) { 921 ifq = &sc->sc_fastq; 922 if (IF_QFULL(ifq)) { 923 IF_DROP(ifq); 924 m_freem(m); 925 error = ENOBUFS; 926 } 927 else { 928 IF_ENQUEUE(ifq, m); 929 error = 0; 930 } 931 } else 932 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 933 if (error) { 934 sc->sc_if.if_oerrors++; 935 sc->sc_stats.ppp_oerrors++; 936 } 937 break; 938 939 case NPMODE_DROP: 940 case NPMODE_ERROR: 941 *mpp = m->m_nextpkt; 942 m_freem(m); 943 break; 944 945 case NPMODE_QUEUE: 946 mpp = &m->m_nextpkt; 947 break; 948 } 949 } 950 sc->sc_npqtail = mpp; 951 } 952 953 /* 954 * Transmitter has finished outputting some stuff; 955 * remember to call sc->sc_start later at splsoftnet. 956 */ 957 void 958 ppp_restart(sc) 959 struct ppp_softc *sc; 960 { 961 int s = splnet(); 962 963 sc->sc_flags &= ~SC_TBUSY; 964 schednetisr(NETISR_PPP); 965 splx(s); 966 } 967 968 /* 969 * Get a packet to send. This procedure is intended to be called at 970 * splsoftnet, since it may involve time-consuming operations such as 971 * applying VJ compression, packet compression, address/control and/or 972 * protocol field compression to the packet. 973 */ 974 struct mbuf * 975 ppp_dequeue(sc) 976 struct ppp_softc *sc; 977 { 978 struct mbuf *m, *mp; 979 u_char *cp; 980 int address, control, protocol; 981 982 /* 983 * Grab a packet to send: first try the fast queue, then the 984 * normal queue. 985 */ 986 IF_DEQUEUE(&sc->sc_fastq, m); 987 if (m == NULL) 988 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 989 if (m == NULL) 990 return NULL; 991 992 ++sc->sc_stats.ppp_opackets; 993 994 /* 995 * Extract the ppp header of the new packet. 996 * The ppp header will be in one mbuf. 997 */ 998 cp = mtod(m, u_char *); 999 address = PPP_ADDRESS(cp); 1000 control = PPP_CONTROL(cp); 1001 protocol = PPP_PROTOCOL(cp); 1002 1003 switch (protocol) { 1004 case PPP_IP: 1005 #ifdef VJC 1006 /* 1007 * If the packet is a TCP/IP packet, see if we can compress it. 1008 */ 1009 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1010 struct ip *ip; 1011 int type; 1012 1013 mp = m; 1014 ip = (struct ip *) (cp + PPP_HDRLEN); 1015 if (mp->m_len <= PPP_HDRLEN) { 1016 mp = mp->m_next; 1017 if (mp == NULL) 1018 break; 1019 ip = mtod(mp, struct ip *); 1020 } 1021 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1022 if (ip->ip_p == IPPROTO_TCP) { 1023 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1024 !(sc->sc_flags & SC_NO_TCP_CCID)); 1025 switch (type) { 1026 case TYPE_UNCOMPRESSED_TCP: 1027 protocol = PPP_VJC_UNCOMP; 1028 break; 1029 case TYPE_COMPRESSED_TCP: 1030 protocol = PPP_VJC_COMP; 1031 cp = mtod(m, u_char *); 1032 cp[0] = address; /* header has moved */ 1033 cp[1] = control; 1034 cp[2] = 0; 1035 break; 1036 } 1037 cp[3] = protocol; /* update protocol in PPP header */ 1038 } 1039 } 1040 #endif /* VJC */ 1041 break; 1042 1043 #ifdef PPP_COMPRESS 1044 case PPP_CCP: 1045 ppp_ccp(sc, m, 0); 1046 break; 1047 #endif /* PPP_COMPRESS */ 1048 } 1049 1050 #ifdef PPP_COMPRESS 1051 if (protocol != PPP_LCP && protocol != PPP_CCP 1052 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1053 struct mbuf *mcomp = NULL; 1054 int slen; 1055 1056 slen = 0; 1057 for (mp = m; mp != NULL; mp = mp->m_next) 1058 slen += mp->m_len; 1059 (*sc->sc_xcomp->compress) 1060 (sc->sc_xc_state, &mcomp, m, slen, 1061 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 1062 if (mcomp != NULL) { 1063 if (sc->sc_flags & SC_CCP_UP) { 1064 /* Send the compressed packet instead of the original. */ 1065 m_freem(m); 1066 m = mcomp; 1067 cp = mtod(m, u_char *); 1068 protocol = cp[3]; 1069 } else { 1070 /* Can't transmit compressed packets until CCP is up. */ 1071 m_freem(mcomp); 1072 } 1073 } 1074 } 1075 #endif /* PPP_COMPRESS */ 1076 1077 /* 1078 * Compress the address/control and protocol, if possible. 1079 */ 1080 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1081 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1082 protocol != PPP_LCP) { 1083 /* can compress address/control */ 1084 m->m_data += 2; 1085 m->m_len -= 2; 1086 } 1087 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1088 /* can compress protocol */ 1089 if (mtod(m, u_char *) == cp) { 1090 cp[2] = cp[1]; /* move address/control up */ 1091 cp[1] = cp[0]; 1092 } 1093 ++m->m_data; 1094 --m->m_len; 1095 } 1096 1097 return m; 1098 } 1099 1100 /* 1101 * Software interrupt routine, called at splsoftnet. 1102 */ 1103 void 1104 pppintr() 1105 { 1106 struct ppp_softc *sc; 1107 int s, s2; 1108 struct mbuf *m; 1109 1110 splsoftassert(IPL_SOFTNET); 1111 1112 s = splsoftnet(); /* XXX - what's the point of this? see comment above */ 1113 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1114 if (!(sc->sc_flags & SC_TBUSY) 1115 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head)) { 1116 s2 = splnet(); 1117 sc->sc_flags |= SC_TBUSY; 1118 splx(s2); 1119 (*sc->sc_start)(sc); 1120 } 1121 while (sc->sc_rawq.ifq_head) { 1122 s2 = splnet(); 1123 IF_DEQUEUE(&sc->sc_rawq, m); 1124 splx(s2); 1125 if (m == NULL) 1126 break; 1127 ppp_inproc(sc, m); 1128 } 1129 } 1130 splx(s); 1131 } 1132 1133 #ifdef PPP_COMPRESS 1134 /* 1135 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1136 * 0 if it is about to be transmitted. 1137 */ 1138 static void 1139 ppp_ccp(sc, m, rcvd) 1140 struct ppp_softc *sc; 1141 struct mbuf *m; 1142 int rcvd; 1143 { 1144 u_char *dp, *ep; 1145 struct mbuf *mp; 1146 int slen, s; 1147 1148 /* 1149 * Get a pointer to the data after the PPP header. 1150 */ 1151 if (m->m_len <= PPP_HDRLEN) { 1152 mp = m->m_next; 1153 if (mp == NULL) 1154 return; 1155 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1156 } else { 1157 mp = m; 1158 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1159 } 1160 1161 ep = mtod(mp, u_char *) + mp->m_len; 1162 if (dp + CCP_HDRLEN > ep) 1163 return; 1164 slen = CCP_LENGTH(dp); 1165 if (dp + slen > ep) { 1166 if (sc->sc_flags & SC_DEBUG) 1167 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1168 dp, slen, mtod(mp, u_char *), mp->m_len); 1169 return; 1170 } 1171 1172 switch (CCP_CODE(dp)) { 1173 case CCP_CONFREQ: 1174 case CCP_TERMREQ: 1175 case CCP_TERMACK: 1176 /* CCP must be going down - disable compression */ 1177 if (sc->sc_flags & SC_CCP_UP) { 1178 s = splnet(); 1179 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1180 splx(s); 1181 } 1182 break; 1183 1184 case CCP_CONFACK: 1185 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1186 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1187 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1188 if (!rcvd) { 1189 /* we're agreeing to send compressed packets. */ 1190 if (sc->sc_xc_state != NULL 1191 && (*sc->sc_xcomp->comp_init) 1192 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1193 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1194 s = splnet(); 1195 sc->sc_flags |= SC_COMP_RUN; 1196 splx(s); 1197 } 1198 } else { 1199 /* peer is agreeing to send compressed packets. */ 1200 if (sc->sc_rc_state != NULL 1201 && (*sc->sc_rcomp->decomp_init) 1202 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1203 sc->sc_unit, 0, sc->sc_mru, 1204 sc->sc_flags & SC_DEBUG)) { 1205 s = splnet(); 1206 sc->sc_flags |= SC_DECOMP_RUN; 1207 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1208 splx(s); 1209 } 1210 } 1211 } 1212 break; 1213 1214 case CCP_RESETACK: 1215 if (sc->sc_flags & SC_CCP_UP) { 1216 if (!rcvd) { 1217 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1218 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1219 } else { 1220 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1221 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1222 s = splnet(); 1223 sc->sc_flags &= ~SC_DC_ERROR; 1224 splx(s); 1225 } 1226 } 1227 } 1228 break; 1229 } 1230 } 1231 1232 /* 1233 * CCP is down; free (de)compressor state if necessary. 1234 */ 1235 static void 1236 ppp_ccp_closed(sc) 1237 struct ppp_softc *sc; 1238 { 1239 if (sc->sc_xc_state) { 1240 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1241 sc->sc_xc_state = NULL; 1242 } 1243 if (sc->sc_rc_state) { 1244 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1245 sc->sc_rc_state = NULL; 1246 } 1247 } 1248 #endif /* PPP_COMPRESS */ 1249 1250 /* 1251 * PPP packet input routine. 1252 * The caller has checked and removed the FCS and has inserted 1253 * the address/control bytes and the protocol high byte if they 1254 * were omitted. 1255 */ 1256 void 1257 ppppktin(sc, m, lost) 1258 struct ppp_softc *sc; 1259 struct mbuf *m; 1260 int lost; 1261 { 1262 int s = splnet(); 1263 1264 if (lost) 1265 m->m_flags |= M_ERRMARK; 1266 IF_ENQUEUE(&sc->sc_rawq, m); 1267 schednetisr(NETISR_PPP); 1268 splx(s); 1269 } 1270 1271 /* 1272 * Process a received PPP packet, doing decompression as necessary. 1273 * Should be called at splsoftnet. 1274 */ 1275 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1276 TYPE_UNCOMPRESSED_TCP) 1277 1278 static void 1279 ppp_inproc(sc, m) 1280 struct ppp_softc *sc; 1281 struct mbuf *m; 1282 { 1283 struct ifnet *ifp = &sc->sc_if; 1284 struct ifqueue *inq; 1285 int s, ilen, xlen, proto, rv; 1286 u_char *cp, adrs, ctrl; 1287 struct mbuf *mp, *dmp = NULL; 1288 u_char *iphdr; 1289 u_int hlen; 1290 1291 sc->sc_stats.ppp_ipackets++; 1292 1293 if (sc->sc_flags & SC_LOG_INPKT) { 1294 ilen = 0; 1295 for (mp = m; mp != NULL; mp = mp->m_next) 1296 ilen += mp->m_len; 1297 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1298 pppdumpm(m); 1299 } 1300 1301 cp = mtod(m, u_char *); 1302 adrs = PPP_ADDRESS(cp); 1303 ctrl = PPP_CONTROL(cp); 1304 proto = PPP_PROTOCOL(cp); 1305 1306 if (m->m_flags & M_ERRMARK) { 1307 m->m_flags &= ~M_ERRMARK; 1308 s = splnet(); 1309 sc->sc_flags |= SC_VJ_RESET; 1310 splx(s); 1311 } 1312 1313 #ifdef PPP_COMPRESS 1314 /* 1315 * Decompress this packet if necessary, update the receiver's 1316 * dictionary, or take appropriate action on a CCP packet. 1317 */ 1318 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1319 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1320 /* decompress this packet */ 1321 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1322 if (rv == DECOMP_OK) { 1323 m_freem(m); 1324 if (dmp == NULL) { 1325 /* no error, but no decompressed packet produced */ 1326 return; 1327 } 1328 m = dmp; 1329 cp = mtod(m, u_char *); 1330 proto = PPP_PROTOCOL(cp); 1331 1332 } else { 1333 /* 1334 * An error has occurred in decompression. 1335 * Pass the compressed packet up to pppd, which may take 1336 * CCP down or issue a Reset-Req. 1337 */ 1338 if (sc->sc_flags & SC_DEBUG) 1339 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1340 s = splnet(); 1341 sc->sc_flags |= SC_VJ_RESET; 1342 if (rv == DECOMP_ERROR) 1343 sc->sc_flags |= SC_DC_ERROR; 1344 else 1345 sc->sc_flags |= SC_DC_FERROR; 1346 splx(s); 1347 } 1348 1349 } else { 1350 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1351 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1352 } 1353 if (proto == PPP_CCP) { 1354 ppp_ccp(sc, m, 1); 1355 } 1356 } 1357 #endif 1358 1359 ilen = 0; 1360 for (mp = m; mp != NULL; mp = mp->m_next) 1361 ilen += mp->m_len; 1362 1363 #ifdef VJC 1364 if (sc->sc_flags & SC_VJ_RESET) { 1365 /* 1366 * If we've missed a packet, we must toss subsequent compressed 1367 * packets which don't have an explicit connection ID. 1368 */ 1369 if (sc->sc_comp) 1370 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1371 s = splnet(); 1372 sc->sc_flags &= ~SC_VJ_RESET; 1373 splx(s); 1374 } 1375 1376 /* 1377 * See if we have a VJ-compressed packet to uncompress. 1378 */ 1379 if (proto == PPP_VJC_COMP) { 1380 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1381 goto bad; 1382 1383 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1384 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1385 sc->sc_comp, &iphdr, &hlen); 1386 1387 if (xlen <= 0) { 1388 if (sc->sc_flags & SC_DEBUG) 1389 printf("%s: VJ uncompress failed on type comp\n", 1390 ifp->if_xname); 1391 goto bad; 1392 } 1393 1394 /* Copy the PPP and IP headers into a new mbuf. */ 1395 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1396 if (mp == NULL) 1397 goto bad; 1398 mp->m_len = 0; 1399 mp->m_next = NULL; 1400 if (hlen + PPP_HDRLEN > MHLEN) { 1401 MCLGET(mp, M_DONTWAIT); 1402 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1403 m_freem(mp); 1404 goto bad; /* lose if big headers and no clusters */ 1405 } 1406 } 1407 if (m->m_flags & M_PKTHDR) 1408 M_MOVE_HDR(mp, m); 1409 cp = mtod(mp, u_char *); 1410 cp[0] = adrs; 1411 cp[1] = ctrl; 1412 cp[2] = 0; 1413 cp[3] = PPP_IP; 1414 proto = PPP_IP; 1415 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1416 mp->m_len = hlen + PPP_HDRLEN; 1417 1418 /* 1419 * Trim the PPP and VJ headers off the old mbuf 1420 * and stick the new and old mbufs together. 1421 */ 1422 m->m_data += PPP_HDRLEN + xlen; 1423 m->m_len -= PPP_HDRLEN + xlen; 1424 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1425 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1426 mp->m_len += m->m_len; 1427 MFREE(m, mp->m_next); 1428 } else 1429 mp->m_next = m; 1430 m = mp; 1431 ilen += hlen - xlen; 1432 1433 } else if (proto == PPP_VJC_UNCOMP) { 1434 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1435 goto bad; 1436 1437 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1438 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1439 sc->sc_comp, &iphdr, &hlen); 1440 1441 if (xlen < 0) { 1442 if (sc->sc_flags & SC_DEBUG) 1443 printf("%s: VJ uncompress failed on type uncomp\n", 1444 ifp->if_xname); 1445 goto bad; 1446 } 1447 1448 proto = PPP_IP; 1449 cp[3] = PPP_IP; 1450 } 1451 #endif /* VJC */ 1452 1453 /* 1454 * If the packet will fit in a header mbuf, don't waste a 1455 * whole cluster on it. 1456 */ 1457 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1458 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1459 if (mp != NULL) { 1460 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1461 m_freem(m); 1462 m = mp; 1463 m->m_len = ilen; 1464 } 1465 } 1466 m->m_pkthdr.len = ilen; 1467 m->m_pkthdr.rcvif = ifp; 1468 1469 if ((proto & 0x8000) == 0) { 1470 #if NBPFILTER > 0 1471 /* 1472 * See whether we want to pass this packet, and 1473 * if it counts as link activity. 1474 */ 1475 adrs = *mtod(m, u_char *); /* save address field */ 1476 *mtod(m, u_char *) = 0; /* indicate inbound */ 1477 if (sc->sc_pass_filt.bf_insns != 0 1478 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1479 ilen, 0) == 0) { 1480 /* drop this packet */ 1481 m_freem(m); 1482 return; 1483 } 1484 if (sc->sc_active_filt.bf_insns == 0 1485 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1486 sc->sc_last_recv = time_second; 1487 1488 *mtod(m, u_char *) = adrs; 1489 #else 1490 /* 1491 * Record the time that we received this packet. 1492 */ 1493 sc->sc_last_recv = time_second; 1494 #endif 1495 } 1496 1497 #if NBPFILTER > 0 1498 /* See if bpf wants to look at the packet. */ 1499 if (sc->sc_bpf) 1500 bpf_mtap(sc->sc_bpf, m, BPF_DIRECTION_IN); 1501 #endif 1502 1503 rv = 0; 1504 switch (proto) { 1505 #ifdef INET 1506 case PPP_IP: 1507 /* 1508 * IP packet - take off the ppp header and pass it up to IP. 1509 */ 1510 if ((ifp->if_flags & IFF_UP) == 0 1511 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1512 /* interface is down - drop the packet. */ 1513 m_freem(m); 1514 return; 1515 } 1516 m->m_pkthdr.len -= PPP_HDRLEN; 1517 m->m_data += PPP_HDRLEN; 1518 m->m_len -= PPP_HDRLEN; 1519 schednetisr(NETISR_IP); 1520 inq = &ipintrq; 1521 break; 1522 #endif 1523 1524 default: 1525 /* 1526 * Some other protocol - place on input queue for read(). 1527 */ 1528 inq = &sc->sc_inq; 1529 rv = 1; 1530 break; 1531 } 1532 1533 /* 1534 * Put the packet on the appropriate input queue. 1535 */ 1536 s = splnet(); 1537 if (IF_QFULL(inq)) { 1538 IF_DROP(inq); 1539 splx(s); 1540 if (sc->sc_flags & SC_DEBUG) 1541 printf("%s: input queue full\n", ifp->if_xname); 1542 ifp->if_iqdrops++; 1543 if (!inq->ifq_congestion) 1544 if_congestion(inq); 1545 goto bad; 1546 } 1547 IF_ENQUEUE(inq, m); 1548 splx(s); 1549 ifp->if_ipackets++; 1550 ifp->if_ibytes += ilen; 1551 1552 if (rv) 1553 (*sc->sc_ctlp)(sc); 1554 1555 return; 1556 1557 bad: 1558 m_freem(m); 1559 sc->sc_if.if_ierrors++; 1560 sc->sc_stats.ppp_ierrors++; 1561 } 1562 1563 #define MAX_DUMP_BYTES 128 1564 1565 static void 1566 pppdumpm(m0) 1567 struct mbuf *m0; 1568 { 1569 char buf[3*MAX_DUMP_BYTES+4]; 1570 char *bp = buf; 1571 struct mbuf *m; 1572 static char digits[] = "0123456789abcdef"; 1573 1574 for (m = m0; m; m = m->m_next) { 1575 int l = m->m_len; 1576 u_char *rptr = (u_char *)m->m_data; 1577 1578 while (l--) { 1579 if (bp > buf + sizeof(buf) - 4) 1580 goto done; 1581 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1582 *bp++ = digits[*rptr++ & 0xf]; 1583 } 1584 1585 if (m->m_next) { 1586 if (bp > buf + sizeof(buf) - 3) 1587 goto done; 1588 *bp++ = '|'; 1589 } else 1590 *bp++ = ' '; 1591 } 1592 done: 1593 if (m) 1594 *bp++ = '>'; 1595 *bp = 0; 1596 printf("%s\n", buf); 1597 } 1598 1599 #ifdef ALTQ 1600 /* 1601 * a wrapper to transmit a packet from if_start since ALTQ uses 1602 * if_start to send a packet. 1603 */ 1604 static void 1605 ppp_ifstart(ifp) 1606 struct ifnet *ifp; 1607 { 1608 struct ppp_softc *sc; 1609 1610 sc = ifp->if_softc; 1611 (*sc->sc_start)(sc); 1612 } 1613 #endif 1614 1615 #endif /* NPPP > 0 */ 1616