1 /* $OpenBSD: if_ppp.c,v 1.65 2012/03/28 19:39:33 claudio 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(void) 221 { 222 LIST_INIT(&ppp_softc_list); 223 if_clone_attach(&ppp_cloner); 224 } 225 226 int 227 ppp_clone_create(struct if_clone *ifc, int unit) 228 { 229 struct ppp_softc *sc; 230 int s; 231 232 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); 233 if (!sc) 234 return (ENOMEM); 235 236 sc->sc_unit = unit; 237 snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d", 238 ifc->ifc_name, unit); 239 sc->sc_if.if_softc = sc; 240 sc->sc_if.if_mtu = PPP_MTU; 241 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 242 sc->sc_if.if_type = IFT_PPP; 243 sc->sc_if.if_hdrlen = PPP_HDRLEN; 244 sc->sc_if.if_ioctl = pppsioctl; 245 sc->sc_if.if_output = pppoutput; 246 sc->sc_if.if_start = ppp_ifstart; 247 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, ifqmaxlen); 248 IFQ_SET_MAXLEN(&sc->sc_inq, ifqmaxlen); 249 IFQ_SET_MAXLEN(&sc->sc_fastq, ifqmaxlen); 250 IFQ_SET_MAXLEN(&sc->sc_rawq, ifqmaxlen); 251 IFQ_SET_READY(&sc->sc_if.if_snd); 252 if_attach(&sc->sc_if); 253 if_alloc_sadl(&sc->sc_if); 254 #if NBPFILTER > 0 255 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 256 #endif 257 s = splnet(); 258 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 259 splx(s); 260 261 return (0); 262 } 263 264 int 265 ppp_clone_destroy(struct ifnet *ifp) 266 { 267 struct ppp_softc *sc = ifp->if_softc; 268 int s; 269 270 if (sc->sc_devp != NULL) 271 return (EBUSY); 272 273 s = splnet(); 274 LIST_REMOVE(sc, sc_list); 275 splx(s); 276 277 if_detach(ifp); 278 279 free(sc, M_DEVBUF); 280 return (0); 281 } 282 283 /* 284 * Allocate a ppp interface unit and initialize it. 285 */ 286 struct ppp_softc * 287 pppalloc(pid_t pid) 288 { 289 int i; 290 struct ppp_softc *sc; 291 292 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 293 if (sc->sc_xfer == pid) { 294 sc->sc_xfer = 0; 295 return sc; 296 } 297 LIST_FOREACH(sc, &ppp_softc_list, sc_list) 298 if (sc->sc_devp == NULL) 299 break; 300 if (sc == NULL) 301 return NULL; 302 303 sc->sc_flags = 0; 304 sc->sc_mru = PPP_MRU; 305 sc->sc_relinq = NULL; 306 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 307 #ifdef VJC 308 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 309 if (sc->sc_comp) 310 sl_compress_init(sc->sc_comp); 311 #endif 312 #ifdef PPP_COMPRESS 313 sc->sc_xc_state = NULL; 314 sc->sc_rc_state = NULL; 315 #endif /* PPP_COMPRESS */ 316 for (i = 0; i < NUM_NP; ++i) 317 sc->sc_npmode[i] = NPMODE_ERROR; 318 sc->sc_npqueue = NULL; 319 sc->sc_npqtail = &sc->sc_npqueue; 320 sc->sc_last_sent = sc->sc_last_recv = time_second; 321 322 return sc; 323 } 324 325 /* 326 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 327 */ 328 void 329 pppdealloc(struct ppp_softc *sc) 330 { 331 struct mbuf *m; 332 333 splsoftassert(IPL_SOFTNET); 334 335 if_down(&sc->sc_if); 336 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 337 sc->sc_devp = NULL; 338 sc->sc_xfer = 0; 339 for (;;) { 340 IF_DEQUEUE(&sc->sc_rawq, m); 341 if (m == NULL) 342 break; 343 m_freem(m); 344 } 345 for (;;) { 346 IF_DEQUEUE(&sc->sc_inq, m); 347 if (m == NULL) 348 break; 349 m_freem(m); 350 } 351 for (;;) { 352 IF_DEQUEUE(&sc->sc_fastq, m); 353 if (m == NULL) 354 break; 355 m_freem(m); 356 } 357 while ((m = sc->sc_npqueue) != NULL) { 358 sc->sc_npqueue = m->m_nextpkt; 359 m_freem(m); 360 } 361 if (sc->sc_togo != NULL) { 362 m_freem(sc->sc_togo); 363 sc->sc_togo = NULL; 364 } 365 #ifdef PPP_COMPRESS 366 ppp_ccp_closed(sc); 367 sc->sc_xc_state = NULL; 368 sc->sc_rc_state = NULL; 369 #endif /* PPP_COMPRESS */ 370 #if NBPFILTER > 0 371 if (sc->sc_pass_filt.bf_insns != 0) { 372 free(sc->sc_pass_filt.bf_insns, M_DEVBUF); 373 sc->sc_pass_filt.bf_insns = 0; 374 sc->sc_pass_filt.bf_len = 0; 375 } 376 if (sc->sc_active_filt.bf_insns != 0) { 377 free(sc->sc_active_filt.bf_insns, M_DEVBUF); 378 sc->sc_active_filt.bf_insns = 0; 379 sc->sc_active_filt.bf_len = 0; 380 } 381 #endif 382 #ifdef VJC 383 if (sc->sc_comp != 0) { 384 free(sc->sc_comp, M_DEVBUF); 385 sc->sc_comp = 0; 386 } 387 #endif 388 } 389 390 /* 391 * Ioctl routine for generic ppp devices. 392 */ 393 int 394 pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag, 395 struct proc *p) 396 { 397 int s, error, flags, mru, npx; 398 u_int nb; 399 struct ppp_option_data *odp; 400 struct compressor **cp; 401 struct npioctl *npi; 402 time_t t; 403 #if NBPFILTER > 0 404 struct bpf_program *bp, *nbp; 405 struct bpf_insn *newcode, *oldcode; 406 int newcodelen; 407 #endif 408 #ifdef PPP_COMPRESS 409 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 410 #endif 411 412 switch (cmd) { 413 case FIONREAD: 414 *(int *)data = IFQ_LEN(&sc->sc_inq); 415 break; 416 417 case PPPIOCGUNIT: 418 *(int *)data = sc->sc_unit; /* XXX */ 419 break; 420 421 case PPPIOCGFLAGS: 422 *(u_int *)data = sc->sc_flags; 423 break; 424 425 case PPPIOCSFLAGS: 426 if ((error = suser(p, 0)) != 0) 427 return (error); 428 flags = *(int *)data & SC_MASK; 429 s = splsoftnet(); 430 #ifdef PPP_COMPRESS 431 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 432 ppp_ccp_closed(sc); 433 #endif 434 splnet(); 435 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 436 splx(s); 437 break; 438 439 case PPPIOCSMRU: 440 if ((error = suser(p, 0)) != 0) 441 return (error); 442 mru = *(int *)data; 443 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 444 sc->sc_mru = mru; 445 break; 446 447 case PPPIOCGMRU: 448 *(int *)data = sc->sc_mru; 449 break; 450 451 #ifdef VJC 452 case PPPIOCSMAXCID: 453 if ((error = suser(p, 0)) != 0) 454 return (error); 455 if (sc->sc_comp) { 456 s = splsoftnet(); 457 sl_compress_setup(sc->sc_comp, *(int *)data); 458 splx(s); 459 } 460 break; 461 #endif 462 463 case PPPIOCXFERUNIT: 464 if ((error = suser(p, 0)) != 0) 465 return (error); 466 sc->sc_xfer = p->p_p->ps_pid; 467 break; 468 469 #ifdef PPP_COMPRESS 470 case PPPIOCSCOMPRESS: 471 if ((error = suser(p, 0)) != 0) 472 return (error); 473 odp = (struct ppp_option_data *) data; 474 nb = odp->length; 475 if (nb > sizeof(ccp_option)) 476 nb = sizeof(ccp_option); 477 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 478 return (error); 479 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 480 return (EINVAL); 481 for (cp = ppp_compressors; *cp != NULL; ++cp) 482 if ((*cp)->compress_proto == ccp_option[0]) { 483 /* 484 * Found a handler for the protocol - try to allocate 485 * a compressor or decompressor. 486 */ 487 error = 0; 488 if (odp->transmit) { 489 s = splsoftnet(); 490 if (sc->sc_xc_state != NULL) 491 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 492 sc->sc_xcomp = *cp; 493 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 494 if (sc->sc_xc_state == NULL) { 495 if (sc->sc_flags & SC_DEBUG) 496 printf("%s: comp_alloc failed\n", 497 sc->sc_if.if_xname); 498 error = ENOBUFS; 499 } 500 splnet(); 501 sc->sc_flags &= ~SC_COMP_RUN; 502 splx(s); 503 } else { 504 s = splsoftnet(); 505 if (sc->sc_rc_state != NULL) 506 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 507 sc->sc_rcomp = *cp; 508 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 509 if (sc->sc_rc_state == NULL) { 510 if (sc->sc_flags & SC_DEBUG) 511 printf("%s: decomp_alloc failed\n", 512 sc->sc_if.if_xname); 513 error = ENOBUFS; 514 } 515 splnet(); 516 sc->sc_flags &= ~SC_DECOMP_RUN; 517 splx(s); 518 } 519 return (error); 520 } 521 if (sc->sc_flags & SC_DEBUG) 522 printf("%s: no compressor for [%x %x %x], %x\n", 523 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 524 ccp_option[2], nb); 525 return (EINVAL); /* no handler found */ 526 #endif /* PPP_COMPRESS */ 527 528 case PPPIOCGNPMODE: 529 case PPPIOCSNPMODE: 530 npi = (struct npioctl *) data; 531 switch (npi->protocol) { 532 case PPP_IP: 533 npx = NP_IP; 534 break; 535 default: 536 return EINVAL; 537 } 538 if (cmd == PPPIOCGNPMODE) { 539 npi->mode = sc->sc_npmode[npx]; 540 } else { 541 if ((error = suser(p, 0)) != 0) 542 return (error); 543 if (npi->mode != sc->sc_npmode[npx]) { 544 s = splsoftnet(); 545 sc->sc_npmode[npx] = npi->mode; 546 if (npi->mode != NPMODE_QUEUE) { 547 ppp_requeue(sc); 548 (*sc->sc_start)(sc); 549 } 550 splx(s); 551 } 552 } 553 break; 554 555 case PPPIOCGIDLE: 556 s = splsoftnet(); 557 t = time_second; 558 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 559 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 560 splx(s); 561 break; 562 563 #if NBPFILTER > 0 564 case PPPIOCSPASS: 565 case PPPIOCSACTIVE: 566 nbp = (struct bpf_program *) data; 567 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 568 return EINVAL; 569 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 570 if (newcodelen != 0) { 571 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 572 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 573 newcodelen)) != 0) { 574 free(newcode, M_DEVBUF); 575 return error; 576 } 577 if (!bpf_validate(newcode, nbp->bf_len)) { 578 free(newcode, M_DEVBUF); 579 return EINVAL; 580 } 581 } else 582 newcode = 0; 583 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 584 oldcode = bp->bf_insns; 585 s = splnet(); 586 bp->bf_len = nbp->bf_len; 587 bp->bf_insns = newcode; 588 splx(s); 589 if (oldcode != 0) 590 free(oldcode, M_DEVBUF); 591 break; 592 #endif 593 594 default: 595 return (-1); 596 } 597 return (0); 598 } 599 600 /* 601 * Process an ioctl request to the ppp network interface. 602 */ 603 static int 604 pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 605 { 606 struct ppp_softc *sc = ifp->if_softc; 607 struct ifaddr *ifa = (struct ifaddr *)data; 608 struct ifreq *ifr = (struct ifreq *)data; 609 struct ppp_stats *psp; 610 #ifdef PPP_COMPRESS 611 struct ppp_comp_stats *pcp; 612 #endif 613 int s = splnet(), error = 0; 614 615 switch (cmd) { 616 case SIOCSIFFLAGS: 617 if ((ifp->if_flags & IFF_RUNNING) == 0) 618 ifp->if_flags &= ~IFF_UP; 619 break; 620 621 case SIOCSIFADDR: 622 if (ifa->ifa_addr->sa_family != AF_INET) 623 error = EAFNOSUPPORT; 624 break; 625 626 case SIOCSIFDSTADDR: 627 if (ifa->ifa_addr->sa_family != AF_INET) 628 error = EAFNOSUPPORT; 629 break; 630 631 case SIOCSIFMTU: 632 sc->sc_if.if_mtu = ifr->ifr_mtu; 633 break; 634 635 case SIOCADDMULTI: 636 case SIOCDELMULTI: 637 if (ifr == 0) { 638 error = EAFNOSUPPORT; 639 break; 640 } 641 switch(ifr->ifr_addr.sa_family) { 642 #ifdef INET 643 case AF_INET: 644 break; 645 #endif 646 default: 647 error = EAFNOSUPPORT; 648 break; 649 } 650 break; 651 652 case SIOCGPPPSTATS: 653 psp = &((struct ifpppstatsreq *) data)->stats; 654 bzero(psp, sizeof(*psp)); 655 psp->p = sc->sc_stats; 656 #if defined(VJC) && !defined(SL_NO_STATS) 657 if (sc->sc_comp) { 658 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 659 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 660 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 661 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 662 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 663 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 664 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 665 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 666 } 667 #endif /* VJC */ 668 break; 669 670 #ifdef PPP_COMPRESS 671 case SIOCGPPPCSTATS: 672 pcp = &((struct ifpppcstatsreq *) data)->stats; 673 bzero(pcp, sizeof(*pcp)); 674 if (sc->sc_xc_state != NULL) 675 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 676 if (sc->sc_rc_state != NULL) 677 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 678 break; 679 #endif /* PPP_COMPRESS */ 680 681 default: 682 error = ENOTTY; 683 } 684 splx(s); 685 return (error); 686 } 687 688 /* 689 * Queue a packet. Start transmission if not active. 690 * Packet is placed in Information field of PPP frame. 691 */ 692 int 693 pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 694 struct rtentry *rtp) 695 { 696 struct ppp_softc *sc = ifp->if_softc; 697 int protocol, address, control; 698 u_char *cp; 699 int s, error; 700 struct ip *ip; 701 struct ifqueue *ifq; 702 enum NPmode mode; 703 int len; 704 705 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 706 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 707 error = ENETDOWN; /* sort of */ 708 goto bad; 709 } 710 711 #ifdef DIAGNOSTIC 712 if (ifp->if_rdomain != rtable_l2(m0->m_pkthdr.rdomain)) { 713 printf("%s: trying to send packet on wrong domain. " 714 "if %d vs. mbuf %d, AF %d\n", ifp->if_xname, ifp->if_rdomain, 715 rtable_l2(m0->m_pkthdr.rdomain), dst->sa_family); 716 } 717 #endif 718 719 /* 720 * Compute PPP header. 721 */ 722 m0->m_flags &= ~M_HIGHPRI; 723 switch (dst->sa_family) { 724 #ifdef INET 725 case AF_INET: 726 address = PPP_ALLSTATIONS; 727 control = PPP_UI; 728 protocol = PPP_IP; 729 mode = sc->sc_npmode[NP_IP]; 730 731 /* 732 * If this packet has the "low delay" bit set in the IP header, 733 * put it on the fastq instead. 734 */ 735 ip = mtod(m0, struct ip *); 736 if (ip->ip_tos & IPTOS_LOWDELAY) 737 m0->m_flags |= M_HIGHPRI; 738 break; 739 #endif 740 case AF_UNSPEC: 741 address = PPP_ADDRESS(dst->sa_data); 742 control = PPP_CONTROL(dst->sa_data); 743 protocol = PPP_PROTOCOL(dst->sa_data); 744 mode = NPMODE_PASS; 745 break; 746 default: 747 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 748 error = EAFNOSUPPORT; 749 goto bad; 750 } 751 752 /* 753 * Drop this packet, or return an error, if necessary. 754 */ 755 if (mode == NPMODE_ERROR) { 756 error = ENETDOWN; 757 goto bad; 758 } 759 if (mode == NPMODE_DROP) { 760 error = 0; 761 goto bad; 762 } 763 764 /* 765 * Add PPP header. If no space in first mbuf, allocate another. 766 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 767 */ 768 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 769 if (m0 == 0) { 770 error = ENOBUFS; 771 goto bad; 772 } 773 774 cp = mtod(m0, u_char *); 775 *cp++ = address; 776 *cp++ = control; 777 *cp++ = protocol >> 8; 778 *cp++ = protocol & 0xff; 779 780 if ((m0->m_flags & M_PKTHDR) == 0) 781 panic("mbuf packet without packet header!"); 782 len = m0->m_pkthdr.len; 783 784 if (sc->sc_flags & SC_LOG_OUTPKT) { 785 printf("%s output: ", ifp->if_xname); 786 pppdumpm(m0); 787 } 788 789 if ((protocol & 0x8000) == 0) { 790 #if NBPFILTER > 0 791 /* 792 * Apply the pass and active filters to the packet, 793 * but only if it is a data packet. 794 */ 795 *mtod(m0, u_char *) = 1; /* indicates outbound */ 796 if (sc->sc_pass_filt.bf_insns != 0 797 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 798 len, 0) == 0) { 799 error = 0; /* drop this packet */ 800 goto bad; 801 } 802 803 /* 804 * Update the time we sent the most recent packet. 805 */ 806 if (sc->sc_active_filt.bf_insns == 0 807 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 808 sc->sc_last_sent = time_second; 809 810 *mtod(m0, u_char *) = address; 811 #else 812 /* 813 * Update the time we sent the most recent packet. 814 */ 815 sc->sc_last_sent = time_second; 816 #endif 817 } 818 819 #if NBPFILTER > 0 820 /* 821 * See if bpf wants to look at the packet. 822 */ 823 if (sc->sc_bpf) 824 bpf_mtap(sc->sc_bpf, m0, BPF_DIRECTION_OUT); 825 #endif 826 827 /* 828 * Put the packet on the appropriate queue. 829 */ 830 s = splsoftnet(); 831 if (mode == NPMODE_QUEUE) { 832 /* XXX we should limit the number of packets on this queue */ 833 *sc->sc_npqtail = m0; 834 m0->m_nextpkt = NULL; 835 sc->sc_npqtail = &m0->m_nextpkt; 836 } else { 837 if ((m0->m_flags & M_HIGHPRI) 838 #ifdef ALTQ 839 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 840 #endif 841 ) { 842 ifq = &sc->sc_fastq; 843 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 844 IF_DROP(ifq); 845 m_freem(m0); 846 error = ENOBUFS; 847 } 848 else { 849 IF_ENQUEUE(ifq, m0); 850 error = 0; 851 } 852 } else 853 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, NULL, error); 854 if (error) { 855 splx(s); 856 sc->sc_if.if_oerrors++; 857 sc->sc_stats.ppp_oerrors++; 858 return (error); 859 } 860 (*sc->sc_start)(sc); 861 } 862 ifp->if_opackets++; 863 ifp->if_obytes += len; 864 865 splx(s); 866 return (0); 867 868 bad: 869 m_freem(m0); 870 return (error); 871 } 872 873 /* 874 * After a change in the NPmode for some NP, move packets from the 875 * npqueue to the send queue or the fast queue as appropriate. 876 * Should be called at splsoftnet. 877 */ 878 static void 879 ppp_requeue(struct ppp_softc *sc) 880 { 881 struct mbuf *m, **mpp; 882 struct ifqueue *ifq; 883 enum NPmode mode; 884 int error; 885 886 splsoftassert(IPL_SOFTNET); 887 888 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 889 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 890 case PPP_IP: 891 mode = sc->sc_npmode[NP_IP]; 892 break; 893 default: 894 mode = NPMODE_PASS; 895 } 896 897 switch (mode) { 898 case NPMODE_PASS: 899 /* 900 * This packet can now go on one of the queues to be sent. 901 */ 902 *mpp = m->m_nextpkt; 903 m->m_nextpkt = NULL; 904 if ((m->m_flags & M_HIGHPRI) 905 #ifdef ALTQ 906 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 907 #endif 908 ) { 909 ifq = &sc->sc_fastq; 910 if (IF_QFULL(ifq)) { 911 IF_DROP(ifq); 912 m_freem(m); 913 error = ENOBUFS; 914 } 915 else { 916 IF_ENQUEUE(ifq, m); 917 error = 0; 918 } 919 } else 920 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 921 if (error) { 922 sc->sc_if.if_oerrors++; 923 sc->sc_stats.ppp_oerrors++; 924 } 925 break; 926 927 case NPMODE_DROP: 928 case NPMODE_ERROR: 929 *mpp = m->m_nextpkt; 930 m_freem(m); 931 break; 932 933 case NPMODE_QUEUE: 934 mpp = &m->m_nextpkt; 935 break; 936 } 937 } 938 sc->sc_npqtail = mpp; 939 } 940 941 /* 942 * Transmitter has finished outputting some stuff; 943 * remember to call sc->sc_start later at splsoftnet. 944 */ 945 void 946 ppp_restart(struct ppp_softc *sc) 947 { 948 int s = splnet(); 949 950 sc->sc_flags &= ~SC_TBUSY; 951 schednetisr(NETISR_PPP); 952 splx(s); 953 } 954 955 /* 956 * Get a packet to send. This procedure is intended to be called at 957 * splsoftnet, since it may involve time-consuming operations such as 958 * applying VJ compression, packet compression, address/control and/or 959 * protocol field compression to the packet. 960 */ 961 struct mbuf * 962 ppp_dequeue(struct ppp_softc *sc) 963 { 964 struct mbuf *m, *mp; 965 u_char *cp; 966 int address, control, protocol; 967 968 /* 969 * Grab a packet to send: first try the fast queue, then the 970 * normal queue. 971 */ 972 IF_DEQUEUE(&sc->sc_fastq, m); 973 if (m == NULL) 974 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 975 if (m == NULL) 976 return NULL; 977 978 ++sc->sc_stats.ppp_opackets; 979 980 /* 981 * Extract the ppp header of the new packet. 982 * The ppp header will be in one mbuf. 983 */ 984 cp = mtod(m, u_char *); 985 address = PPP_ADDRESS(cp); 986 control = PPP_CONTROL(cp); 987 protocol = PPP_PROTOCOL(cp); 988 989 switch (protocol) { 990 case PPP_IP: 991 #ifdef VJC 992 /* 993 * If the packet is a TCP/IP packet, see if we can compress it. 994 */ 995 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 996 struct ip *ip; 997 int type; 998 999 mp = m; 1000 ip = (struct ip *) (cp + PPP_HDRLEN); 1001 if (mp->m_len <= PPP_HDRLEN) { 1002 mp = mp->m_next; 1003 if (mp == NULL) 1004 break; 1005 ip = mtod(mp, struct ip *); 1006 } 1007 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1008 if (ip->ip_p == IPPROTO_TCP) { 1009 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1010 !(sc->sc_flags & SC_NO_TCP_CCID)); 1011 switch (type) { 1012 case TYPE_UNCOMPRESSED_TCP: 1013 protocol = PPP_VJC_UNCOMP; 1014 break; 1015 case TYPE_COMPRESSED_TCP: 1016 protocol = PPP_VJC_COMP; 1017 cp = mtod(m, u_char *); 1018 cp[0] = address; /* header has moved */ 1019 cp[1] = control; 1020 cp[2] = 0; 1021 break; 1022 } 1023 cp[3] = protocol; /* update protocol in PPP header */ 1024 } 1025 } 1026 #endif /* VJC */ 1027 break; 1028 1029 #ifdef PPP_COMPRESS 1030 case PPP_CCP: 1031 ppp_ccp(sc, m, 0); 1032 break; 1033 #endif /* PPP_COMPRESS */ 1034 } 1035 1036 #ifdef PPP_COMPRESS 1037 if (protocol != PPP_LCP && protocol != PPP_CCP 1038 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1039 struct mbuf *mcomp = NULL; 1040 int slen; 1041 1042 slen = 0; 1043 for (mp = m; mp != NULL; mp = mp->m_next) 1044 slen += mp->m_len; 1045 (*sc->sc_xcomp->compress) 1046 (sc->sc_xc_state, &mcomp, m, slen, 1047 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 1048 if (mcomp != NULL) { 1049 if (sc->sc_flags & SC_CCP_UP) { 1050 /* Send the compressed packet instead of the original. */ 1051 m_freem(m); 1052 m = mcomp; 1053 cp = mtod(m, u_char *); 1054 protocol = cp[3]; 1055 } else { 1056 /* Can't transmit compressed packets until CCP is up. */ 1057 m_freem(mcomp); 1058 } 1059 } 1060 } 1061 #endif /* PPP_COMPRESS */ 1062 1063 /* 1064 * Compress the address/control and protocol, if possible. 1065 */ 1066 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1067 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1068 protocol != PPP_LCP) { 1069 /* can compress address/control */ 1070 m->m_data += 2; 1071 m->m_len -= 2; 1072 } 1073 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1074 /* can compress protocol */ 1075 if (mtod(m, u_char *) == cp) { 1076 cp[2] = cp[1]; /* move address/control up */ 1077 cp[1] = cp[0]; 1078 } 1079 ++m->m_data; 1080 --m->m_len; 1081 } 1082 1083 return m; 1084 } 1085 1086 /* 1087 * Software interrupt routine, called at splsoftnet. 1088 */ 1089 void 1090 pppintr(void) 1091 { 1092 struct ppp_softc *sc; 1093 int s, s2; 1094 struct mbuf *m; 1095 1096 splsoftassert(IPL_SOFTNET); 1097 1098 s = splsoftnet(); /* XXX - what's the point of this? see comment above */ 1099 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1100 if (!(sc->sc_flags & SC_TBUSY) 1101 && (!IFQ_IS_EMPTY(&sc->sc_if.if_snd) || 1102 !IFQ_IS_EMPTY(&sc->sc_fastq))) { 1103 s2 = splnet(); 1104 sc->sc_flags |= SC_TBUSY; 1105 splx(s2); 1106 (*sc->sc_start)(sc); 1107 } 1108 while (!IFQ_IS_EMPTY(&sc->sc_rawq)) { 1109 s2 = splnet(); 1110 IF_DEQUEUE(&sc->sc_rawq, m); 1111 splx(s2); 1112 if (m == NULL) 1113 break; 1114 ppp_inproc(sc, m); 1115 } 1116 } 1117 splx(s); 1118 } 1119 1120 #ifdef PPP_COMPRESS 1121 /* 1122 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1123 * 0 if it is about to be transmitted. 1124 */ 1125 static void 1126 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1127 { 1128 u_char *dp, *ep; 1129 struct mbuf *mp; 1130 int slen, s; 1131 1132 /* 1133 * Get a pointer to the data after the PPP header. 1134 */ 1135 if (m->m_len <= PPP_HDRLEN) { 1136 mp = m->m_next; 1137 if (mp == NULL) 1138 return; 1139 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1140 } else { 1141 mp = m; 1142 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1143 } 1144 1145 ep = mtod(mp, u_char *) + mp->m_len; 1146 if (dp + CCP_HDRLEN > ep) 1147 return; 1148 slen = CCP_LENGTH(dp); 1149 if (dp + slen > ep) { 1150 if (sc->sc_flags & SC_DEBUG) 1151 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1152 dp, slen, mtod(mp, u_char *), mp->m_len); 1153 return; 1154 } 1155 1156 switch (CCP_CODE(dp)) { 1157 case CCP_CONFREQ: 1158 case CCP_TERMREQ: 1159 case CCP_TERMACK: 1160 /* CCP must be going down - disable compression */ 1161 if (sc->sc_flags & SC_CCP_UP) { 1162 s = splnet(); 1163 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1164 splx(s); 1165 } 1166 break; 1167 1168 case CCP_CONFACK: 1169 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1170 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1171 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1172 if (!rcvd) { 1173 /* we're agreeing to send compressed packets. */ 1174 if (sc->sc_xc_state != NULL 1175 && (*sc->sc_xcomp->comp_init) 1176 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1177 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1178 s = splnet(); 1179 sc->sc_flags |= SC_COMP_RUN; 1180 splx(s); 1181 } 1182 } else { 1183 /* peer is agreeing to send compressed packets. */ 1184 if (sc->sc_rc_state != NULL 1185 && (*sc->sc_rcomp->decomp_init) 1186 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1187 sc->sc_unit, 0, sc->sc_mru, 1188 sc->sc_flags & SC_DEBUG)) { 1189 s = splnet(); 1190 sc->sc_flags |= SC_DECOMP_RUN; 1191 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1192 splx(s); 1193 } 1194 } 1195 } 1196 break; 1197 1198 case CCP_RESETACK: 1199 if (sc->sc_flags & SC_CCP_UP) { 1200 if (!rcvd) { 1201 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1202 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1203 } else { 1204 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1205 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1206 s = splnet(); 1207 sc->sc_flags &= ~SC_DC_ERROR; 1208 splx(s); 1209 } 1210 } 1211 } 1212 break; 1213 } 1214 } 1215 1216 /* 1217 * CCP is down; free (de)compressor state if necessary. 1218 */ 1219 static void 1220 ppp_ccp_closed(struct ppp_softc *sc) 1221 { 1222 if (sc->sc_xc_state) { 1223 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1224 sc->sc_xc_state = NULL; 1225 } 1226 if (sc->sc_rc_state) { 1227 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1228 sc->sc_rc_state = NULL; 1229 } 1230 } 1231 #endif /* PPP_COMPRESS */ 1232 1233 /* 1234 * PPP packet input routine. 1235 * The caller has checked and removed the FCS and has inserted 1236 * the address/control bytes and the protocol high byte if they 1237 * were omitted. 1238 */ 1239 void 1240 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1241 { 1242 int s = splnet(); 1243 1244 if (lost) 1245 m->m_flags |= M_ERRMARK; 1246 IF_ENQUEUE(&sc->sc_rawq, m); 1247 schednetisr(NETISR_PPP); 1248 splx(s); 1249 } 1250 1251 /* 1252 * Process a received PPP packet, doing decompression as necessary. 1253 * Should be called at splsoftnet. 1254 */ 1255 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1256 TYPE_UNCOMPRESSED_TCP) 1257 1258 static void 1259 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1260 { 1261 struct ifnet *ifp = &sc->sc_if; 1262 struct ifqueue *inq; 1263 int s, ilen, xlen, proto, rv; 1264 u_char *cp, adrs, ctrl; 1265 struct mbuf *mp, *dmp = NULL; 1266 u_char *iphdr; 1267 u_int hlen; 1268 1269 sc->sc_stats.ppp_ipackets++; 1270 1271 if (sc->sc_flags & SC_LOG_INPKT) { 1272 ilen = 0; 1273 for (mp = m; mp != NULL; mp = mp->m_next) 1274 ilen += mp->m_len; 1275 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1276 pppdumpm(m); 1277 } 1278 1279 cp = mtod(m, u_char *); 1280 adrs = PPP_ADDRESS(cp); 1281 ctrl = PPP_CONTROL(cp); 1282 proto = PPP_PROTOCOL(cp); 1283 1284 if (m->m_flags & M_ERRMARK) { 1285 m->m_flags &= ~M_ERRMARK; 1286 s = splnet(); 1287 sc->sc_flags |= SC_VJ_RESET; 1288 splx(s); 1289 } 1290 1291 #ifdef PPP_COMPRESS 1292 /* 1293 * Decompress this packet if necessary, update the receiver's 1294 * dictionary, or take appropriate action on a CCP packet. 1295 */ 1296 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1297 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1298 /* decompress this packet */ 1299 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1300 if (rv == DECOMP_OK) { 1301 m_freem(m); 1302 if (dmp == NULL) { 1303 /* no error, but no decompressed packet produced */ 1304 return; 1305 } 1306 m = dmp; 1307 cp = mtod(m, u_char *); 1308 proto = PPP_PROTOCOL(cp); 1309 1310 } else { 1311 /* 1312 * An error has occurred in decompression. 1313 * Pass the compressed packet up to pppd, which may take 1314 * CCP down or issue a Reset-Req. 1315 */ 1316 if (sc->sc_flags & SC_DEBUG) 1317 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1318 s = splnet(); 1319 sc->sc_flags |= SC_VJ_RESET; 1320 if (rv == DECOMP_ERROR) 1321 sc->sc_flags |= SC_DC_ERROR; 1322 else 1323 sc->sc_flags |= SC_DC_FERROR; 1324 splx(s); 1325 } 1326 1327 } else { 1328 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1329 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1330 } 1331 if (proto == PPP_CCP) { 1332 ppp_ccp(sc, m, 1); 1333 } 1334 } 1335 #endif 1336 1337 ilen = 0; 1338 for (mp = m; mp != NULL; mp = mp->m_next) 1339 ilen += mp->m_len; 1340 1341 #ifdef VJC 1342 if (sc->sc_flags & SC_VJ_RESET) { 1343 /* 1344 * If we've missed a packet, we must toss subsequent compressed 1345 * packets which don't have an explicit connection ID. 1346 */ 1347 if (sc->sc_comp) 1348 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1349 s = splnet(); 1350 sc->sc_flags &= ~SC_VJ_RESET; 1351 splx(s); 1352 } 1353 1354 /* 1355 * See if we have a VJ-compressed packet to uncompress. 1356 */ 1357 if (proto == PPP_VJC_COMP) { 1358 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1359 goto bad; 1360 1361 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1362 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1363 sc->sc_comp, &iphdr, &hlen); 1364 1365 if (xlen <= 0) { 1366 if (sc->sc_flags & SC_DEBUG) 1367 printf("%s: VJ uncompress failed on type comp\n", 1368 ifp->if_xname); 1369 goto bad; 1370 } 1371 1372 /* Copy the PPP and IP headers into a new mbuf. */ 1373 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1374 if (mp == NULL) 1375 goto bad; 1376 mp->m_len = 0; 1377 mp->m_next = NULL; 1378 if (hlen + PPP_HDRLEN > MHLEN) { 1379 MCLGET(mp, M_DONTWAIT); 1380 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1381 m_freem(mp); 1382 goto bad; /* lose if big headers and no clusters */ 1383 } 1384 } 1385 if (m->m_flags & M_PKTHDR) 1386 M_MOVE_HDR(mp, m); 1387 cp = mtod(mp, u_char *); 1388 cp[0] = adrs; 1389 cp[1] = ctrl; 1390 cp[2] = 0; 1391 cp[3] = PPP_IP; 1392 proto = PPP_IP; 1393 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1394 mp->m_len = hlen + PPP_HDRLEN; 1395 1396 /* 1397 * Trim the PPP and VJ headers off the old mbuf 1398 * and stick the new and old mbufs together. 1399 */ 1400 m->m_data += PPP_HDRLEN + xlen; 1401 m->m_len -= PPP_HDRLEN + xlen; 1402 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1403 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1404 mp->m_len += m->m_len; 1405 MFREE(m, mp->m_next); 1406 } else 1407 mp->m_next = m; 1408 m = mp; 1409 ilen += hlen - xlen; 1410 1411 } else if (proto == PPP_VJC_UNCOMP) { 1412 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1413 goto bad; 1414 1415 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1416 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1417 sc->sc_comp, &iphdr, &hlen); 1418 1419 if (xlen < 0) { 1420 if (sc->sc_flags & SC_DEBUG) 1421 printf("%s: VJ uncompress failed on type uncomp\n", 1422 ifp->if_xname); 1423 goto bad; 1424 } 1425 1426 proto = PPP_IP; 1427 cp[3] = PPP_IP; 1428 } 1429 #endif /* VJC */ 1430 1431 /* 1432 * If the packet will fit in a header mbuf, don't waste a 1433 * whole cluster on it. 1434 */ 1435 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1436 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1437 if (mp != NULL) { 1438 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1439 m_freem(m); 1440 m = mp; 1441 m->m_len = ilen; 1442 } 1443 } 1444 m->m_pkthdr.len = ilen; 1445 m->m_pkthdr.rcvif = ifp; 1446 1447 /* mark incoming routing domain */ 1448 m->m_pkthdr.rdomain = ifp->if_rdomain; 1449 1450 if ((proto & 0x8000) == 0) { 1451 #if NBPFILTER > 0 1452 /* 1453 * See whether we want to pass this packet, and 1454 * if it counts as link activity. 1455 */ 1456 adrs = *mtod(m, u_char *); /* save address field */ 1457 *mtod(m, u_char *) = 0; /* indicate inbound */ 1458 if (sc->sc_pass_filt.bf_insns != 0 1459 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1460 ilen, 0) == 0) { 1461 /* drop this packet */ 1462 m_freem(m); 1463 return; 1464 } 1465 if (sc->sc_active_filt.bf_insns == 0 1466 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1467 sc->sc_last_recv = time_second; 1468 1469 *mtod(m, u_char *) = adrs; 1470 #else 1471 /* 1472 * Record the time that we received this packet. 1473 */ 1474 sc->sc_last_recv = time_second; 1475 #endif 1476 } 1477 1478 #if NBPFILTER > 0 1479 /* See if bpf wants to look at the packet. */ 1480 if (sc->sc_bpf) 1481 bpf_mtap(sc->sc_bpf, m, BPF_DIRECTION_IN); 1482 #endif 1483 1484 rv = 0; 1485 switch (proto) { 1486 #ifdef INET 1487 case PPP_IP: 1488 /* 1489 * IP packet - take off the ppp header and pass it up to IP. 1490 */ 1491 if ((ifp->if_flags & IFF_UP) == 0 1492 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1493 /* interface is down - drop the packet. */ 1494 m_freem(m); 1495 return; 1496 } 1497 m->m_pkthdr.len -= PPP_HDRLEN; 1498 m->m_data += PPP_HDRLEN; 1499 m->m_len -= PPP_HDRLEN; 1500 schednetisr(NETISR_IP); 1501 inq = &ipintrq; 1502 break; 1503 #endif 1504 1505 default: 1506 /* 1507 * Some other protocol - place on input queue for read(). 1508 */ 1509 inq = &sc->sc_inq; 1510 rv = 1; 1511 break; 1512 } 1513 1514 /* 1515 * Put the packet on the appropriate input queue. 1516 */ 1517 s = splnet(); 1518 if (IF_QFULL(inq)) { 1519 IF_DROP(inq); 1520 splx(s); 1521 if (sc->sc_flags & SC_DEBUG) 1522 printf("%s: input queue full\n", ifp->if_xname); 1523 ifp->if_iqdrops++; 1524 if (!inq->ifq_congestion) 1525 if_congestion(inq); 1526 goto bad; 1527 } 1528 IF_ENQUEUE(inq, m); 1529 splx(s); 1530 ifp->if_ipackets++; 1531 ifp->if_ibytes += ilen; 1532 1533 if (rv) 1534 (*sc->sc_ctlp)(sc); 1535 1536 return; 1537 1538 bad: 1539 m_freem(m); 1540 sc->sc_if.if_ierrors++; 1541 sc->sc_stats.ppp_ierrors++; 1542 } 1543 1544 #define MAX_DUMP_BYTES 128 1545 1546 static void 1547 pppdumpm(struct mbuf *m0) 1548 { 1549 char buf[3*MAX_DUMP_BYTES+4]; 1550 char *bp = buf; 1551 struct mbuf *m; 1552 static char digits[] = "0123456789abcdef"; 1553 1554 for (m = m0; m; m = m->m_next) { 1555 int l = m->m_len; 1556 u_char *rptr = mtod(m, u_char *); 1557 1558 while (l--) { 1559 if (bp > buf + sizeof(buf) - 4) 1560 goto done; 1561 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1562 *bp++ = digits[*rptr++ & 0xf]; 1563 } 1564 1565 if (m->m_next) { 1566 if (bp > buf + sizeof(buf) - 3) 1567 goto done; 1568 *bp++ = '|'; 1569 } else 1570 *bp++ = ' '; 1571 } 1572 done: 1573 if (m) 1574 *bp++ = '>'; 1575 *bp = 0; 1576 printf("%s\n", buf); 1577 } 1578 1579 static void 1580 ppp_ifstart(struct ifnet *ifp) 1581 { 1582 struct ppp_softc *sc; 1583 1584 sc = ifp->if_softc; 1585 (*sc->sc_start)(sc); 1586 } 1587 #endif /* NPPP > 0 */ 1588