1 /* $OpenBSD: if_ppp.c,v 1.75 2014/07/12 18:44:22 tedu 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/ip.h> 132 #else 133 #ifdef _KERNEL 134 #ifdef VJC 135 #error ppp device with VJC assumes INET 136 #endif 137 #endif 138 #endif 139 140 #include "bpfilter.h" 141 #if NBPFILTER > 0 142 #include <net/bpf.h> 143 #endif 144 145 #ifdef VJC 146 #include <net/slcompress.h> 147 #endif 148 149 #include <net/ppp_defs.h> 150 #include <net/if_ppp.h> 151 #include <net/if_pppvar.h> 152 153 #ifdef PPP_COMPRESS 154 #define PACKETPTR struct mbuf * 155 #include <net/ppp-comp.h> 156 #endif 157 158 static int pppsioctl(struct ifnet *, u_long, caddr_t); 159 static void ppp_requeue(struct ppp_softc *); 160 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 161 static void ppp_ccp_closed(struct ppp_softc *); 162 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 163 static void pppdumpm(struct mbuf *m0); 164 static void ppp_ifstart(struct ifnet *ifp); 165 int ppp_clone_create(struct if_clone *, int); 166 int ppp_clone_destroy(struct ifnet *); 167 168 /* 169 * Some useful mbuf macros not in mbuf.h. 170 */ 171 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 172 173 #define M_DATASTART(m) \ 174 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 175 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 176 177 #define M_DATASIZE(m) \ 178 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 179 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 180 181 /* 182 * We steal two bits in the mbuf m_flags, to mark high-priority packets 183 * for output, and received packets following lost/corrupted packets. 184 */ 185 #define M_HIGHPRI M_PROTO1 /* output packet for sc_fastq */ 186 #define M_ERRMARK M_LINK0 /* steal a bit in mbuf m_flags */ 187 188 189 #ifdef PPP_COMPRESS 190 /* 191 * List of compressors we know about. 192 * We leave some space so maybe we can modload compressors. 193 */ 194 195 extern struct compressor ppp_bsd_compress; 196 extern struct compressor ppp_deflate, ppp_deflate_draft; 197 198 struct compressor *ppp_compressors[8] = { 199 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 200 &ppp_bsd_compress, 201 #endif 202 #if DO_DEFLATE && defined(PPP_DEFLATE) 203 &ppp_deflate, 204 &ppp_deflate_draft, 205 #endif 206 NULL 207 }; 208 #endif /* PPP_COMPRESS */ 209 210 LIST_HEAD(, ppp_softc) ppp_softc_list; 211 struct if_clone ppp_cloner = 212 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 213 214 /* 215 * Called from boot code to establish ppp interfaces. 216 */ 217 void 218 pppattach(void) 219 { 220 LIST_INIT(&ppp_softc_list); 221 if_clone_attach(&ppp_cloner); 222 } 223 224 int 225 ppp_clone_create(struct if_clone *ifc, int unit) 226 { 227 struct ppp_softc *sc; 228 int s; 229 230 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); 231 if (!sc) 232 return (ENOMEM); 233 234 sc->sc_unit = unit; 235 snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d", 236 ifc->ifc_name, unit); 237 sc->sc_if.if_softc = sc; 238 sc->sc_if.if_mtu = PPP_MTU; 239 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 240 sc->sc_if.if_type = IFT_PPP; 241 sc->sc_if.if_hdrlen = PPP_HDRLEN; 242 sc->sc_if.if_ioctl = pppsioctl; 243 sc->sc_if.if_output = pppoutput; 244 sc->sc_if.if_start = ppp_ifstart; 245 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 246 IFQ_SET_MAXLEN(&sc->sc_inq, IFQ_MAXLEN); 247 IFQ_SET_MAXLEN(&sc->sc_fastq, IFQ_MAXLEN); 248 IFQ_SET_MAXLEN(&sc->sc_rawq, IFQ_MAXLEN); 249 IFQ_SET_READY(&sc->sc_if.if_snd); 250 if_attach(&sc->sc_if); 251 if_alloc_sadl(&sc->sc_if); 252 #if NBPFILTER > 0 253 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 254 #endif 255 s = splnet(); 256 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 257 splx(s); 258 259 return (0); 260 } 261 262 int 263 ppp_clone_destroy(struct ifnet *ifp) 264 { 265 struct ppp_softc *sc = ifp->if_softc; 266 int s; 267 268 if (sc->sc_devp != NULL) 269 return (EBUSY); 270 271 s = splnet(); 272 LIST_REMOVE(sc, sc_list); 273 splx(s); 274 275 if_detach(ifp); 276 277 free(sc, M_DEVBUF, 0); 278 return (0); 279 } 280 281 /* 282 * Allocate a ppp interface unit and initialize it. 283 */ 284 struct ppp_softc * 285 pppalloc(pid_t pid) 286 { 287 int i; 288 struct ppp_softc *sc; 289 290 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 291 if (sc->sc_xfer == pid) { 292 sc->sc_xfer = 0; 293 return sc; 294 } 295 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 296 if (sc->sc_devp == NULL) 297 break; 298 if (sc == NULL) 299 return NULL; 300 301 sc->sc_flags = 0; 302 sc->sc_mru = PPP_MRU; 303 sc->sc_relinq = NULL; 304 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 305 #ifdef VJC 306 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 307 if (sc->sc_comp) 308 sl_compress_init(sc->sc_comp); 309 #endif 310 #ifdef PPP_COMPRESS 311 sc->sc_xc_state = NULL; 312 sc->sc_rc_state = NULL; 313 #endif /* PPP_COMPRESS */ 314 for (i = 0; i < NUM_NP; ++i) 315 sc->sc_npmode[i] = NPMODE_ERROR; 316 sc->sc_npqueue = NULL; 317 sc->sc_npqtail = &sc->sc_npqueue; 318 sc->sc_last_sent = sc->sc_last_recv = time_second; 319 320 return sc; 321 } 322 323 /* 324 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 325 */ 326 void 327 pppdealloc(struct ppp_softc *sc) 328 { 329 struct mbuf *m; 330 331 splsoftassert(IPL_SOFTNET); 332 333 if_down(&sc->sc_if); 334 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 335 sc->sc_devp = NULL; 336 sc->sc_xfer = 0; 337 for (;;) { 338 IF_DEQUEUE(&sc->sc_rawq, m); 339 if (m == NULL) 340 break; 341 m_freem(m); 342 } 343 for (;;) { 344 IF_DEQUEUE(&sc->sc_inq, m); 345 if (m == NULL) 346 break; 347 m_freem(m); 348 } 349 for (;;) { 350 IF_DEQUEUE(&sc->sc_fastq, m); 351 if (m == NULL) 352 break; 353 m_freem(m); 354 } 355 while ((m = sc->sc_npqueue) != NULL) { 356 sc->sc_npqueue = m->m_nextpkt; 357 m_freem(m); 358 } 359 if (sc->sc_togo != NULL) { 360 m_freem(sc->sc_togo); 361 sc->sc_togo = NULL; 362 } 363 #ifdef PPP_COMPRESS 364 ppp_ccp_closed(sc); 365 sc->sc_xc_state = NULL; 366 sc->sc_rc_state = NULL; 367 #endif /* PPP_COMPRESS */ 368 #if NBPFILTER > 0 369 if (sc->sc_pass_filt.bf_insns != 0) { 370 free(sc->sc_pass_filt.bf_insns, M_DEVBUF, 0); 371 sc->sc_pass_filt.bf_insns = 0; 372 sc->sc_pass_filt.bf_len = 0; 373 } 374 if (sc->sc_active_filt.bf_insns != 0) { 375 free(sc->sc_active_filt.bf_insns, M_DEVBUF, 0); 376 sc->sc_active_filt.bf_insns = 0; 377 sc->sc_active_filt.bf_len = 0; 378 } 379 #endif 380 #ifdef VJC 381 if (sc->sc_comp != 0) { 382 free(sc->sc_comp, M_DEVBUF, 0); 383 sc->sc_comp = 0; 384 } 385 #endif 386 } 387 388 /* 389 * Ioctl routine for generic ppp devices. 390 */ 391 int 392 pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag, 393 struct proc *p) 394 { 395 int s, error, flags, mru, npx; 396 u_int nb; 397 struct ppp_option_data *odp; 398 struct compressor **cp; 399 struct npioctl *npi; 400 time_t t; 401 #if NBPFILTER > 0 402 struct bpf_program *bp, *nbp; 403 struct bpf_insn *newcode, *oldcode; 404 int newcodelen; 405 #endif 406 #ifdef PPP_COMPRESS 407 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 408 #endif 409 410 switch (cmd) { 411 case FIONREAD: 412 *(int *)data = IFQ_LEN(&sc->sc_inq); 413 break; 414 415 case PPPIOCGUNIT: 416 *(int *)data = sc->sc_unit; /* XXX */ 417 break; 418 419 case PPPIOCGFLAGS: 420 *(u_int *)data = sc->sc_flags; 421 break; 422 423 case PPPIOCSFLAGS: 424 if ((error = suser(p, 0)) != 0) 425 return (error); 426 flags = *(int *)data & SC_MASK; 427 s = splsoftnet(); 428 #ifdef PPP_COMPRESS 429 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 430 ppp_ccp_closed(sc); 431 #endif 432 splnet(); 433 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 434 splx(s); 435 break; 436 437 case PPPIOCSMRU: 438 if ((error = suser(p, 0)) != 0) 439 return (error); 440 mru = *(int *)data; 441 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 442 sc->sc_mru = mru; 443 break; 444 445 case PPPIOCGMRU: 446 *(int *)data = sc->sc_mru; 447 break; 448 449 #ifdef VJC 450 case PPPIOCSMAXCID: 451 if ((error = suser(p, 0)) != 0) 452 return (error); 453 if (sc->sc_comp) { 454 s = splsoftnet(); 455 sl_compress_setup(sc->sc_comp, *(int *)data); 456 splx(s); 457 } 458 break; 459 #endif 460 461 case PPPIOCXFERUNIT: 462 if ((error = suser(p, 0)) != 0) 463 return (error); 464 sc->sc_xfer = p->p_p->ps_pid; 465 break; 466 467 #ifdef PPP_COMPRESS 468 case PPPIOCSCOMPRESS: 469 if ((error = suser(p, 0)) != 0) 470 return (error); 471 odp = (struct ppp_option_data *) data; 472 nb = odp->length; 473 if (nb > sizeof(ccp_option)) 474 nb = sizeof(ccp_option); 475 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 476 return (error); 477 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 478 return (EINVAL); 479 for (cp = ppp_compressors; *cp != NULL; ++cp) 480 if ((*cp)->compress_proto == ccp_option[0]) { 481 /* 482 * Found a handler for the protocol - try to allocate 483 * a compressor or decompressor. 484 */ 485 error = 0; 486 if (odp->transmit) { 487 s = splsoftnet(); 488 if (sc->sc_xc_state != NULL) 489 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 490 sc->sc_xcomp = *cp; 491 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 492 if (sc->sc_xc_state == NULL) { 493 if (sc->sc_flags & SC_DEBUG) 494 printf("%s: comp_alloc failed\n", 495 sc->sc_if.if_xname); 496 error = ENOBUFS; 497 } 498 splnet(); 499 sc->sc_flags &= ~SC_COMP_RUN; 500 splx(s); 501 } else { 502 s = splsoftnet(); 503 if (sc->sc_rc_state != NULL) 504 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 505 sc->sc_rcomp = *cp; 506 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 507 if (sc->sc_rc_state == NULL) { 508 if (sc->sc_flags & SC_DEBUG) 509 printf("%s: decomp_alloc failed\n", 510 sc->sc_if.if_xname); 511 error = ENOBUFS; 512 } 513 splnet(); 514 sc->sc_flags &= ~SC_DECOMP_RUN; 515 splx(s); 516 } 517 return (error); 518 } 519 if (sc->sc_flags & SC_DEBUG) 520 printf("%s: no compressor for [%x %x %x], %x\n", 521 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 522 ccp_option[2], nb); 523 return (EINVAL); /* no handler found */ 524 #endif /* PPP_COMPRESS */ 525 526 case PPPIOCGNPMODE: 527 case PPPIOCSNPMODE: 528 npi = (struct npioctl *) data; 529 switch (npi->protocol) { 530 case PPP_IP: 531 npx = NP_IP; 532 break; 533 default: 534 return EINVAL; 535 } 536 if (cmd == PPPIOCGNPMODE) { 537 npi->mode = sc->sc_npmode[npx]; 538 } else { 539 if ((error = suser(p, 0)) != 0) 540 return (error); 541 if (npi->mode != sc->sc_npmode[npx]) { 542 s = splsoftnet(); 543 sc->sc_npmode[npx] = npi->mode; 544 if (npi->mode != NPMODE_QUEUE) { 545 ppp_requeue(sc); 546 (*sc->sc_start)(sc); 547 } 548 splx(s); 549 } 550 } 551 break; 552 553 case PPPIOCGIDLE: 554 s = splsoftnet(); 555 t = time_second; 556 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 557 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 558 splx(s); 559 break; 560 561 #if NBPFILTER > 0 562 case PPPIOCSPASS: 563 case PPPIOCSACTIVE: 564 nbp = (struct bpf_program *) data; 565 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 566 return EINVAL; 567 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 568 if (newcodelen != 0) { 569 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 570 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 571 newcodelen)) != 0) { 572 free(newcode, M_DEVBUF, 0); 573 return error; 574 } 575 if (!bpf_validate(newcode, nbp->bf_len)) { 576 free(newcode, M_DEVBUF, 0); 577 return EINVAL; 578 } 579 } else 580 newcode = 0; 581 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 582 oldcode = bp->bf_insns; 583 s = splnet(); 584 bp->bf_len = nbp->bf_len; 585 bp->bf_insns = newcode; 586 splx(s); 587 if (oldcode != 0) 588 free(oldcode, M_DEVBUF, 0); 589 break; 590 #endif 591 592 default: 593 return (-1); 594 } 595 return (0); 596 } 597 598 /* 599 * Process an ioctl request to the ppp network interface. 600 */ 601 static int 602 pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 603 { 604 struct ppp_softc *sc = ifp->if_softc; 605 struct ifaddr *ifa = (struct ifaddr *)data; 606 struct ifreq *ifr = (struct ifreq *)data; 607 struct ppp_stats *psp; 608 #ifdef PPP_COMPRESS 609 struct ppp_comp_stats *pcp; 610 #endif 611 int s = splnet(), error = 0; 612 613 switch (cmd) { 614 case SIOCSIFFLAGS: 615 if ((ifp->if_flags & IFF_RUNNING) == 0) 616 ifp->if_flags &= ~IFF_UP; 617 break; 618 619 case SIOCSIFADDR: 620 if (ifa->ifa_addr->sa_family != AF_INET) 621 error = EAFNOSUPPORT; 622 ifa->ifa_rtrequest = p2p_rtrequest; 623 break; 624 625 case SIOCSIFDSTADDR: 626 if (ifa->ifa_addr->sa_family != AF_INET) 627 error = EAFNOSUPPORT; 628 break; 629 630 case SIOCSIFMTU: 631 sc->sc_if.if_mtu = ifr->ifr_mtu; 632 break; 633 634 case SIOCADDMULTI: 635 case SIOCDELMULTI: 636 break; 637 638 case SIOCGPPPSTATS: 639 psp = &((struct ifpppstatsreq *) data)->stats; 640 bzero(psp, sizeof(*psp)); 641 psp->p = sc->sc_stats; 642 #if defined(VJC) && !defined(SL_NO_STATS) 643 if (sc->sc_comp) { 644 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 645 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 646 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 647 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 648 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 649 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 650 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 651 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 652 } 653 #endif /* VJC */ 654 break; 655 656 #ifdef PPP_COMPRESS 657 case SIOCGPPPCSTATS: 658 pcp = &((struct ifpppcstatsreq *) data)->stats; 659 bzero(pcp, sizeof(*pcp)); 660 if (sc->sc_xc_state != NULL) 661 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 662 if (sc->sc_rc_state != NULL) 663 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 664 break; 665 #endif /* PPP_COMPRESS */ 666 667 default: 668 error = ENOTTY; 669 } 670 splx(s); 671 return (error); 672 } 673 674 /* 675 * Queue a packet. Start transmission if not active. 676 * Packet is placed in Information field of PPP frame. 677 */ 678 int 679 pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 680 struct rtentry *rtp) 681 { 682 struct ppp_softc *sc = ifp->if_softc; 683 int protocol, address, control; 684 u_char *cp; 685 int s, error; 686 struct ip *ip; 687 struct ifqueue *ifq; 688 enum NPmode mode; 689 int len; 690 691 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 692 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 693 error = ENETDOWN; /* sort of */ 694 goto bad; 695 } 696 697 #ifdef DIAGNOSTIC 698 if (ifp->if_rdomain != rtable_l2(m0->m_pkthdr.ph_rtableid)) { 699 printf("%s: trying to send packet on wrong domain. " 700 "if %d vs. mbuf %d, AF %d\n", ifp->if_xname, ifp->if_rdomain, 701 rtable_l2(m0->m_pkthdr.ph_rtableid), dst->sa_family); 702 } 703 #endif 704 705 /* 706 * Compute PPP header. 707 */ 708 m0->m_flags &= ~M_HIGHPRI; 709 switch (dst->sa_family) { 710 #ifdef INET 711 case AF_INET: 712 address = PPP_ALLSTATIONS; 713 control = PPP_UI; 714 protocol = PPP_IP; 715 mode = sc->sc_npmode[NP_IP]; 716 717 /* 718 * If this packet has the "low delay" bit set in the IP header, 719 * put it on the fastq instead. 720 */ 721 ip = mtod(m0, struct ip *); 722 if (ip->ip_tos & IPTOS_LOWDELAY) 723 m0->m_flags |= M_HIGHPRI; 724 break; 725 #endif 726 case AF_UNSPEC: 727 address = PPP_ADDRESS(dst->sa_data); 728 control = PPP_CONTROL(dst->sa_data); 729 protocol = PPP_PROTOCOL(dst->sa_data); 730 mode = NPMODE_PASS; 731 break; 732 default: 733 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 734 error = EAFNOSUPPORT; 735 goto bad; 736 } 737 738 /* 739 * Drop this packet, or return an error, if necessary. 740 */ 741 if (mode == NPMODE_ERROR) { 742 error = ENETDOWN; 743 goto bad; 744 } 745 if (mode == NPMODE_DROP) { 746 error = 0; 747 goto bad; 748 } 749 750 /* 751 * Add PPP header. If no space in first mbuf, allocate another. 752 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 753 */ 754 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 755 if (m0 == 0) { 756 error = ENOBUFS; 757 goto bad; 758 } 759 760 cp = mtod(m0, u_char *); 761 *cp++ = address; 762 *cp++ = control; 763 *cp++ = protocol >> 8; 764 *cp++ = protocol & 0xff; 765 766 if ((m0->m_flags & M_PKTHDR) == 0) 767 panic("mbuf packet without packet header!"); 768 len = m0->m_pkthdr.len; 769 770 if (sc->sc_flags & SC_LOG_OUTPKT) { 771 printf("%s output: ", ifp->if_xname); 772 pppdumpm(m0); 773 } 774 775 if ((protocol & 0x8000) == 0) { 776 #if NBPFILTER > 0 777 /* 778 * Apply the pass and active filters to the packet, 779 * but only if it is a data packet. 780 */ 781 *mtod(m0, u_char *) = 1; /* indicates outbound */ 782 if (sc->sc_pass_filt.bf_insns != 0 783 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 784 len, 0) == 0) { 785 error = 0; /* drop this packet */ 786 goto bad; 787 } 788 789 /* 790 * Update the time we sent the most recent packet. 791 */ 792 if (sc->sc_active_filt.bf_insns == 0 793 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 794 sc->sc_last_sent = time_second; 795 796 *mtod(m0, u_char *) = address; 797 #else 798 /* 799 * Update the time we sent the most recent packet. 800 */ 801 sc->sc_last_sent = time_second; 802 #endif 803 } 804 805 #if NBPFILTER > 0 806 /* 807 * See if bpf wants to look at the packet. 808 */ 809 if (sc->sc_bpf) 810 bpf_mtap(sc->sc_bpf, m0, BPF_DIRECTION_OUT); 811 #endif 812 813 /* 814 * Put the packet on the appropriate queue. 815 */ 816 s = splsoftnet(); 817 if (mode == NPMODE_QUEUE) { 818 /* XXX we should limit the number of packets on this queue */ 819 *sc->sc_npqtail = m0; 820 m0->m_nextpkt = NULL; 821 sc->sc_npqtail = &m0->m_nextpkt; 822 } else { 823 if (m0->m_flags & M_HIGHPRI) { 824 ifq = &sc->sc_fastq; 825 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 826 IF_DROP(ifq); 827 m_freem(m0); 828 error = ENOBUFS; 829 } 830 else { 831 IF_ENQUEUE(ifq, m0); 832 error = 0; 833 } 834 } else 835 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, NULL, error); 836 if (error) { 837 splx(s); 838 sc->sc_if.if_oerrors++; 839 sc->sc_stats.ppp_oerrors++; 840 return (error); 841 } 842 (*sc->sc_start)(sc); 843 } 844 ifp->if_opackets++; 845 ifp->if_obytes += len; 846 847 splx(s); 848 return (0); 849 850 bad: 851 m_freem(m0); 852 return (error); 853 } 854 855 /* 856 * After a change in the NPmode for some NP, move packets from the 857 * npqueue to the send queue or the fast queue as appropriate. 858 * Should be called at splsoftnet. 859 */ 860 static void 861 ppp_requeue(struct ppp_softc *sc) 862 { 863 struct mbuf *m, **mpp; 864 struct ifqueue *ifq; 865 enum NPmode mode; 866 int error; 867 868 splsoftassert(IPL_SOFTNET); 869 870 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 871 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 872 case PPP_IP: 873 mode = sc->sc_npmode[NP_IP]; 874 break; 875 default: 876 mode = NPMODE_PASS; 877 } 878 879 switch (mode) { 880 case NPMODE_PASS: 881 /* 882 * This packet can now go on one of the queues to be sent. 883 */ 884 *mpp = m->m_nextpkt; 885 m->m_nextpkt = NULL; 886 if (m->m_flags & M_HIGHPRI) { 887 ifq = &sc->sc_fastq; 888 if (IF_QFULL(ifq)) { 889 IF_DROP(ifq); 890 m_freem(m); 891 error = ENOBUFS; 892 } 893 else { 894 IF_ENQUEUE(ifq, m); 895 error = 0; 896 } 897 } else 898 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 899 if (error) { 900 sc->sc_if.if_oerrors++; 901 sc->sc_stats.ppp_oerrors++; 902 } 903 break; 904 905 case NPMODE_DROP: 906 case NPMODE_ERROR: 907 *mpp = m->m_nextpkt; 908 m_freem(m); 909 break; 910 911 case NPMODE_QUEUE: 912 mpp = &m->m_nextpkt; 913 break; 914 } 915 } 916 sc->sc_npqtail = mpp; 917 } 918 919 /* 920 * Transmitter has finished outputting some stuff; 921 * remember to call sc->sc_start later at splsoftnet. 922 */ 923 void 924 ppp_restart(struct ppp_softc *sc) 925 { 926 int s = splnet(); 927 928 sc->sc_flags &= ~SC_TBUSY; 929 schednetisr(NETISR_PPP); 930 splx(s); 931 } 932 933 /* 934 * Get a packet to send. This procedure is intended to be called at 935 * splsoftnet, since it may involve time-consuming operations such as 936 * applying VJ compression, packet compression, address/control and/or 937 * protocol field compression to the packet. 938 */ 939 struct mbuf * 940 ppp_dequeue(struct ppp_softc *sc) 941 { 942 struct mbuf *m, *mp; 943 u_char *cp; 944 int address, control, protocol; 945 946 /* 947 * Grab a packet to send: first try the fast queue, then the 948 * normal queue. 949 */ 950 IF_DEQUEUE(&sc->sc_fastq, m); 951 if (m == NULL) 952 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 953 if (m == NULL) 954 return NULL; 955 956 ++sc->sc_stats.ppp_opackets; 957 958 /* 959 * Extract the ppp header of the new packet. 960 * The ppp header will be in one mbuf. 961 */ 962 cp = mtod(m, u_char *); 963 address = PPP_ADDRESS(cp); 964 control = PPP_CONTROL(cp); 965 protocol = PPP_PROTOCOL(cp); 966 967 switch (protocol) { 968 case PPP_IP: 969 #ifdef VJC 970 /* 971 * If the packet is a TCP/IP packet, see if we can compress it. 972 */ 973 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 974 struct ip *ip; 975 int type; 976 977 mp = m; 978 ip = (struct ip *) (cp + PPP_HDRLEN); 979 if (mp->m_len <= PPP_HDRLEN) { 980 mp = mp->m_next; 981 if (mp == NULL) 982 break; 983 ip = mtod(mp, struct ip *); 984 } 985 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 986 if (ip->ip_p == IPPROTO_TCP) { 987 type = sl_compress_tcp(mp, ip, sc->sc_comp, 988 !(sc->sc_flags & SC_NO_TCP_CCID)); 989 switch (type) { 990 case TYPE_UNCOMPRESSED_TCP: 991 protocol = PPP_VJC_UNCOMP; 992 break; 993 case TYPE_COMPRESSED_TCP: 994 protocol = PPP_VJC_COMP; 995 cp = mtod(m, u_char *); 996 cp[0] = address; /* header has moved */ 997 cp[1] = control; 998 cp[2] = 0; 999 break; 1000 } 1001 cp[3] = protocol; /* update protocol in PPP header */ 1002 } 1003 } 1004 #endif /* VJC */ 1005 break; 1006 1007 #ifdef PPP_COMPRESS 1008 case PPP_CCP: 1009 ppp_ccp(sc, m, 0); 1010 break; 1011 #endif /* PPP_COMPRESS */ 1012 } 1013 1014 #ifdef PPP_COMPRESS 1015 if (protocol != PPP_LCP && protocol != PPP_CCP 1016 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1017 struct mbuf *mcomp = NULL; 1018 int slen; 1019 1020 slen = 0; 1021 for (mp = m; mp != NULL; mp = mp->m_next) 1022 slen += mp->m_len; 1023 (*sc->sc_xcomp->compress) 1024 (sc->sc_xc_state, &mcomp, m, slen, 1025 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 1026 if (mcomp != NULL) { 1027 if (sc->sc_flags & SC_CCP_UP) { 1028 /* Send the compressed packet instead of the original. */ 1029 m_freem(m); 1030 m = mcomp; 1031 cp = mtod(m, u_char *); 1032 protocol = cp[3]; 1033 } else { 1034 /* Can't transmit compressed packets until CCP is up. */ 1035 m_freem(mcomp); 1036 } 1037 } 1038 } 1039 #endif /* PPP_COMPRESS */ 1040 1041 /* 1042 * Compress the address/control and protocol, if possible. 1043 */ 1044 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1045 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1046 protocol != PPP_LCP) { 1047 /* can compress address/control */ 1048 m->m_data += 2; 1049 m->m_len -= 2; 1050 } 1051 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1052 /* can compress protocol */ 1053 if (mtod(m, u_char *) == cp) { 1054 cp[2] = cp[1]; /* move address/control up */ 1055 cp[1] = cp[0]; 1056 } 1057 ++m->m_data; 1058 --m->m_len; 1059 } 1060 1061 return m; 1062 } 1063 1064 /* 1065 * Software interrupt routine, called at splsoftnet. 1066 */ 1067 void 1068 pppintr(void) 1069 { 1070 struct ppp_softc *sc; 1071 int s, s2; 1072 struct mbuf *m; 1073 1074 splsoftassert(IPL_SOFTNET); 1075 1076 s = splsoftnet(); /* XXX - what's the point of this? see comment above */ 1077 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1078 if (!(sc->sc_flags & SC_TBUSY) 1079 && (!IFQ_IS_EMPTY(&sc->sc_if.if_snd) || 1080 !IFQ_IS_EMPTY(&sc->sc_fastq))) { 1081 s2 = splnet(); 1082 sc->sc_flags |= SC_TBUSY; 1083 splx(s2); 1084 (*sc->sc_start)(sc); 1085 } 1086 while (!IFQ_IS_EMPTY(&sc->sc_rawq)) { 1087 s2 = splnet(); 1088 IF_DEQUEUE(&sc->sc_rawq, m); 1089 splx(s2); 1090 if (m == NULL) 1091 break; 1092 ppp_inproc(sc, m); 1093 } 1094 } 1095 splx(s); 1096 } 1097 1098 #ifdef PPP_COMPRESS 1099 /* 1100 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1101 * 0 if it is about to be transmitted. 1102 */ 1103 static void 1104 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1105 { 1106 u_char *dp, *ep; 1107 struct mbuf *mp; 1108 int slen, s; 1109 1110 /* 1111 * Get a pointer to the data after the PPP header. 1112 */ 1113 if (m->m_len <= PPP_HDRLEN) { 1114 mp = m->m_next; 1115 if (mp == NULL) 1116 return; 1117 dp = mtod(mp, u_char *); 1118 } else { 1119 mp = m; 1120 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1121 } 1122 1123 ep = mtod(mp, u_char *) + mp->m_len; 1124 if (dp + CCP_HDRLEN > ep) 1125 return; 1126 slen = CCP_LENGTH(dp); 1127 if (dp + slen > ep) { 1128 if (sc->sc_flags & SC_DEBUG) 1129 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1130 dp, slen, mtod(mp, u_char *), mp->m_len); 1131 return; 1132 } 1133 1134 switch (CCP_CODE(dp)) { 1135 case CCP_CONFREQ: 1136 case CCP_TERMREQ: 1137 case CCP_TERMACK: 1138 /* CCP must be going down - disable compression */ 1139 if (sc->sc_flags & SC_CCP_UP) { 1140 s = splnet(); 1141 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1142 splx(s); 1143 } 1144 break; 1145 1146 case CCP_CONFACK: 1147 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1148 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1149 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1150 if (!rcvd) { 1151 /* we're agreeing to send compressed packets. */ 1152 if (sc->sc_xc_state != NULL 1153 && (*sc->sc_xcomp->comp_init) 1154 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1155 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1156 s = splnet(); 1157 sc->sc_flags |= SC_COMP_RUN; 1158 splx(s); 1159 } 1160 } else { 1161 /* peer is agreeing to send compressed packets. */ 1162 if (sc->sc_rc_state != NULL 1163 && (*sc->sc_rcomp->decomp_init) 1164 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1165 sc->sc_unit, 0, sc->sc_mru, 1166 sc->sc_flags & SC_DEBUG)) { 1167 s = splnet(); 1168 sc->sc_flags |= SC_DECOMP_RUN; 1169 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1170 splx(s); 1171 } 1172 } 1173 } 1174 break; 1175 1176 case CCP_RESETACK: 1177 if (sc->sc_flags & SC_CCP_UP) { 1178 if (!rcvd) { 1179 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1180 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1181 } else { 1182 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1183 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1184 s = splnet(); 1185 sc->sc_flags &= ~SC_DC_ERROR; 1186 splx(s); 1187 } 1188 } 1189 } 1190 break; 1191 } 1192 } 1193 1194 /* 1195 * CCP is down; free (de)compressor state if necessary. 1196 */ 1197 static void 1198 ppp_ccp_closed(struct ppp_softc *sc) 1199 { 1200 if (sc->sc_xc_state) { 1201 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1202 sc->sc_xc_state = NULL; 1203 } 1204 if (sc->sc_rc_state) { 1205 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1206 sc->sc_rc_state = NULL; 1207 } 1208 } 1209 #endif /* PPP_COMPRESS */ 1210 1211 /* 1212 * PPP packet input routine. 1213 * The caller has checked and removed the FCS and has inserted 1214 * the address/control bytes and the protocol high byte if they 1215 * were omitted. 1216 */ 1217 void 1218 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1219 { 1220 int s = splnet(); 1221 1222 if (lost) 1223 m->m_flags |= M_ERRMARK; 1224 IF_ENQUEUE(&sc->sc_rawq, m); 1225 schednetisr(NETISR_PPP); 1226 splx(s); 1227 } 1228 1229 /* 1230 * Process a received PPP packet, doing decompression as necessary. 1231 * Should be called at splsoftnet. 1232 */ 1233 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1234 TYPE_UNCOMPRESSED_TCP) 1235 1236 static void 1237 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1238 { 1239 struct ifnet *ifp = &sc->sc_if; 1240 struct ifqueue *inq; 1241 int s, ilen, xlen, proto, rv; 1242 u_char *cp, adrs, ctrl; 1243 struct mbuf *mp, *dmp = NULL; 1244 u_char *iphdr; 1245 u_int hlen; 1246 1247 sc->sc_stats.ppp_ipackets++; 1248 1249 if (sc->sc_flags & SC_LOG_INPKT) { 1250 ilen = 0; 1251 for (mp = m; mp != NULL; mp = mp->m_next) 1252 ilen += mp->m_len; 1253 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1254 pppdumpm(m); 1255 } 1256 1257 cp = mtod(m, u_char *); 1258 adrs = PPP_ADDRESS(cp); 1259 ctrl = PPP_CONTROL(cp); 1260 proto = PPP_PROTOCOL(cp); 1261 1262 if (m->m_flags & M_ERRMARK) { 1263 m->m_flags &= ~M_ERRMARK; 1264 s = splnet(); 1265 sc->sc_flags |= SC_VJ_RESET; 1266 splx(s); 1267 } 1268 1269 #ifdef PPP_COMPRESS 1270 /* 1271 * Decompress this packet if necessary, update the receiver's 1272 * dictionary, or take appropriate action on a CCP packet. 1273 */ 1274 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1275 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1276 /* decompress this packet */ 1277 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1278 if (rv == DECOMP_OK) { 1279 m_freem(m); 1280 if (dmp == NULL) { 1281 /* no error, but no decompressed packet produced */ 1282 return; 1283 } 1284 m = dmp; 1285 cp = mtod(m, u_char *); 1286 proto = PPP_PROTOCOL(cp); 1287 1288 } else { 1289 /* 1290 * An error has occurred in decompression. 1291 * Pass the compressed packet up to pppd, which may take 1292 * CCP down or issue a Reset-Req. 1293 */ 1294 if (sc->sc_flags & SC_DEBUG) 1295 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1296 s = splnet(); 1297 sc->sc_flags |= SC_VJ_RESET; 1298 if (rv == DECOMP_ERROR) 1299 sc->sc_flags |= SC_DC_ERROR; 1300 else 1301 sc->sc_flags |= SC_DC_FERROR; 1302 splx(s); 1303 } 1304 1305 } else { 1306 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1307 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1308 } 1309 if (proto == PPP_CCP) { 1310 ppp_ccp(sc, m, 1); 1311 } 1312 } 1313 #endif 1314 1315 ilen = 0; 1316 for (mp = m; mp != NULL; mp = mp->m_next) 1317 ilen += mp->m_len; 1318 1319 #ifdef VJC 1320 if (sc->sc_flags & SC_VJ_RESET) { 1321 /* 1322 * If we've missed a packet, we must toss subsequent compressed 1323 * packets which don't have an explicit connection ID. 1324 */ 1325 if (sc->sc_comp) 1326 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1327 s = splnet(); 1328 sc->sc_flags &= ~SC_VJ_RESET; 1329 splx(s); 1330 } 1331 1332 /* 1333 * See if we have a VJ-compressed packet to uncompress. 1334 */ 1335 if (proto == PPP_VJC_COMP) { 1336 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1337 goto bad; 1338 1339 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1340 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1341 sc->sc_comp, &iphdr, &hlen); 1342 1343 if (xlen <= 0) { 1344 if (sc->sc_flags & SC_DEBUG) 1345 printf("%s: VJ uncompress failed on type comp\n", 1346 ifp->if_xname); 1347 goto bad; 1348 } 1349 1350 /* Copy the PPP and IP headers into a new mbuf. */ 1351 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1352 if (mp == NULL) 1353 goto bad; 1354 mp->m_len = 0; 1355 mp->m_next = NULL; 1356 if (hlen + PPP_HDRLEN > MHLEN) { 1357 MCLGET(mp, M_DONTWAIT); 1358 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1359 m_freem(mp); 1360 goto bad; /* lose if big headers and no clusters */ 1361 } 1362 } 1363 if (m->m_flags & M_PKTHDR) 1364 M_MOVE_HDR(mp, m); 1365 cp = mtod(mp, u_char *); 1366 cp[0] = adrs; 1367 cp[1] = ctrl; 1368 cp[2] = 0; 1369 cp[3] = PPP_IP; 1370 proto = PPP_IP; 1371 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1372 mp->m_len = hlen + PPP_HDRLEN; 1373 1374 /* 1375 * Trim the PPP and VJ headers off the old mbuf 1376 * and stick the new and old mbufs together. 1377 */ 1378 m->m_data += PPP_HDRLEN + xlen; 1379 m->m_len -= PPP_HDRLEN + xlen; 1380 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1381 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1382 mp->m_len += m->m_len; 1383 MFREE(m, mp->m_next); 1384 } else 1385 mp->m_next = m; 1386 m = mp; 1387 ilen += hlen - xlen; 1388 1389 } else if (proto == PPP_VJC_UNCOMP) { 1390 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1391 goto bad; 1392 1393 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1394 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1395 sc->sc_comp, &iphdr, &hlen); 1396 1397 if (xlen < 0) { 1398 if (sc->sc_flags & SC_DEBUG) 1399 printf("%s: VJ uncompress failed on type uncomp\n", 1400 ifp->if_xname); 1401 goto bad; 1402 } 1403 1404 proto = PPP_IP; 1405 cp[3] = PPP_IP; 1406 } 1407 #endif /* VJC */ 1408 1409 /* 1410 * If the packet will fit in a header mbuf, don't waste a 1411 * whole cluster on it. 1412 */ 1413 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1414 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1415 if (mp != NULL) { 1416 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1417 m_freem(m); 1418 m = mp; 1419 m->m_len = ilen; 1420 } 1421 } 1422 m->m_pkthdr.len = ilen; 1423 m->m_pkthdr.rcvif = ifp; 1424 1425 /* mark incoming routing table */ 1426 m->m_pkthdr.ph_rtableid = ifp->if_rdomain; 1427 1428 if ((proto & 0x8000) == 0) { 1429 #if NBPFILTER > 0 1430 /* 1431 * See whether we want to pass this packet, and 1432 * if it counts as link activity. 1433 */ 1434 adrs = *mtod(m, u_char *); /* save address field */ 1435 *mtod(m, u_char *) = 0; /* indicate inbound */ 1436 if (sc->sc_pass_filt.bf_insns != 0 1437 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1438 ilen, 0) == 0) { 1439 /* drop this packet */ 1440 m_freem(m); 1441 return; 1442 } 1443 if (sc->sc_active_filt.bf_insns == 0 1444 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1445 sc->sc_last_recv = time_second; 1446 1447 *mtod(m, u_char *) = adrs; 1448 #else 1449 /* 1450 * Record the time that we received this packet. 1451 */ 1452 sc->sc_last_recv = time_second; 1453 #endif 1454 } 1455 1456 #if NBPFILTER > 0 1457 /* See if bpf wants to look at the packet. */ 1458 if (sc->sc_bpf) 1459 bpf_mtap(sc->sc_bpf, m, BPF_DIRECTION_IN); 1460 #endif 1461 1462 rv = 0; 1463 switch (proto) { 1464 #ifdef INET 1465 case PPP_IP: 1466 /* 1467 * IP packet - take off the ppp header and pass it up to IP. 1468 */ 1469 if ((ifp->if_flags & IFF_UP) == 0 1470 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1471 /* interface is down - drop the packet. */ 1472 m_freem(m); 1473 return; 1474 } 1475 m->m_pkthdr.len -= PPP_HDRLEN; 1476 m->m_data += PPP_HDRLEN; 1477 m->m_len -= PPP_HDRLEN; 1478 schednetisr(NETISR_IP); 1479 inq = &ipintrq; 1480 break; 1481 #endif 1482 1483 default: 1484 /* 1485 * Some other protocol - place on input queue for read(). 1486 */ 1487 inq = &sc->sc_inq; 1488 rv = 1; 1489 break; 1490 } 1491 1492 /* 1493 * Put the packet on the appropriate input queue. 1494 */ 1495 s = splnet(); 1496 if (IF_QFULL(inq)) { 1497 IF_DROP(inq); 1498 splx(s); 1499 if (sc->sc_flags & SC_DEBUG) 1500 printf("%s: input queue full\n", ifp->if_xname); 1501 ifp->if_iqdrops++; 1502 if (!inq->ifq_congestion) 1503 if_congestion(inq); 1504 goto bad; 1505 } 1506 IF_ENQUEUE(inq, m); 1507 splx(s); 1508 ifp->if_ipackets++; 1509 ifp->if_ibytes += ilen; 1510 1511 if (rv) 1512 (*sc->sc_ctlp)(sc); 1513 1514 return; 1515 1516 bad: 1517 m_freem(m); 1518 sc->sc_if.if_ierrors++; 1519 sc->sc_stats.ppp_ierrors++; 1520 } 1521 1522 #define MAX_DUMP_BYTES 128 1523 1524 static void 1525 pppdumpm(struct mbuf *m0) 1526 { 1527 char buf[3*MAX_DUMP_BYTES+4]; 1528 char *bp = buf; 1529 struct mbuf *m; 1530 static char digits[] = "0123456789abcdef"; 1531 1532 for (m = m0; m; m = m->m_next) { 1533 int l = m->m_len; 1534 u_char *rptr = mtod(m, u_char *); 1535 1536 while (l--) { 1537 if (bp > buf + sizeof(buf) - 4) 1538 goto done; 1539 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1540 *bp++ = digits[*rptr++ & 0xf]; 1541 } 1542 1543 if (m->m_next) { 1544 if (bp > buf + sizeof(buf) - 3) 1545 goto done; 1546 *bp++ = '|'; 1547 } else 1548 *bp++ = ' '; 1549 } 1550 done: 1551 if (m) 1552 *bp++ = '>'; 1553 *bp = 0; 1554 printf("%s\n", buf); 1555 } 1556 1557 static void 1558 ppp_ifstart(struct ifnet *ifp) 1559 { 1560 struct ppp_softc *sc; 1561 1562 sc = ifp->if_softc; 1563 (*sc->sc_start)(sc); 1564 } 1565 #endif /* NPPP > 0 */ 1566