1 /* $OpenBSD: if_ppp.c,v 1.35 2003/06/02 23:28:12 millert 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 #if 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 <sys/time.h> 144 #include <net/bpf.h> 145 #endif 146 147 #ifdef VJC 148 #include <net/slcompress.h> 149 #endif 150 151 #include <net/ppp_defs.h> 152 #include <net/if_ppp.h> 153 #include <net/if_pppvar.h> 154 #include <machine/cpu.h> 155 156 #ifdef PPP_COMPRESS 157 #define PACKETPTR struct mbuf * 158 #include <net/ppp-comp.h> 159 #endif 160 161 struct ppp_softc ppp_softc[NPPP]; 162 163 static int pppsioctl(struct ifnet *, u_long, caddr_t); 164 static void ppp_requeue(struct ppp_softc *); 165 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 166 static void ppp_ccp_closed(struct ppp_softc *); 167 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 168 static void pppdumpm(struct mbuf *m0); 169 #ifdef ALTQ 170 static void ppp_ifstart(struct ifnet *ifp); 171 #endif 172 173 /* 174 * Some useful mbuf macros not in mbuf.h. 175 */ 176 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 177 178 #define M_DATASTART(m) \ 179 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 180 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 181 182 #define M_DATASIZE(m) \ 183 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 184 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 185 186 /* 187 * We steal two bits in the mbuf m_flags, to mark high-priority packets 188 * for output, and received packets following lost/corrupted packets. 189 */ 190 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 191 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 192 193 194 #ifdef PPP_COMPRESS 195 /* 196 * List of compressors we know about. 197 * We leave some space so maybe we can modload compressors. 198 */ 199 200 extern struct compressor ppp_bsd_compress; 201 extern struct compressor ppp_deflate, ppp_deflate_draft; 202 203 struct compressor *ppp_compressors[8] = { 204 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 205 &ppp_bsd_compress, 206 #endif 207 #if DO_DEFLATE && defined(PPP_DEFLATE) 208 &ppp_deflate, 209 &ppp_deflate_draft, 210 #endif 211 NULL 212 }; 213 #endif /* PPP_COMPRESS */ 214 215 216 /* 217 * Called from boot code to establish ppp interfaces. 218 */ 219 void 220 pppattach() 221 { 222 extern int ifqmaxlen; 223 register struct ppp_softc *sc; 224 register int i = 0; 225 226 for (sc = ppp_softc; i < NPPP; sc++) { 227 sc->sc_unit = i; /* XXX */ 228 snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "ppp%d", i++); 229 sc->sc_if.if_softc = sc; 230 sc->sc_if.if_mtu = PPP_MTU; 231 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 232 sc->sc_if.if_type = IFT_PPP; 233 sc->sc_if.if_hdrlen = PPP_HDRLEN; 234 sc->sc_if.if_ioctl = pppsioctl; 235 sc->sc_if.if_output = pppoutput; 236 #ifdef ALTQ 237 sc->sc_if.if_start = ppp_ifstart; 238 #endif 239 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, ifqmaxlen); 240 sc->sc_inq.ifq_maxlen = ifqmaxlen; 241 sc->sc_fastq.ifq_maxlen = ifqmaxlen; 242 sc->sc_rawq.ifq_maxlen = ifqmaxlen; 243 IFQ_SET_READY(&sc->sc_if.if_snd); 244 if_attach(&sc->sc_if); 245 if_alloc_sadl(&sc->sc_if); 246 #if NBPFILTER > 0 247 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 248 #endif 249 } 250 } 251 252 /* 253 * Allocate a ppp interface unit and initialize it. 254 */ 255 struct ppp_softc * 256 pppalloc(pid) 257 pid_t pid; 258 { 259 int nppp, i; 260 struct ppp_softc *sc; 261 262 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 263 if (sc->sc_xfer == pid) { 264 sc->sc_xfer = 0; 265 return sc; 266 } 267 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 268 if (sc->sc_devp == NULL) 269 break; 270 if (nppp >= NPPP) 271 return NULL; 272 273 sc->sc_flags = 0; 274 sc->sc_mru = PPP_MRU; 275 sc->sc_relinq = NULL; 276 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 277 #ifdef VJC 278 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 279 M_DEVBUF, M_NOWAIT); 280 if (sc->sc_comp) 281 sl_compress_init(sc->sc_comp); 282 #endif 283 #ifdef PPP_COMPRESS 284 sc->sc_xc_state = NULL; 285 sc->sc_rc_state = NULL; 286 #endif /* PPP_COMPRESS */ 287 for (i = 0; i < NUM_NP; ++i) 288 sc->sc_npmode[i] = NPMODE_ERROR; 289 sc->sc_npqueue = NULL; 290 sc->sc_npqtail = &sc->sc_npqueue; 291 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 292 293 return sc; 294 } 295 296 /* 297 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 298 */ 299 void 300 pppdealloc(sc) 301 struct ppp_softc *sc; 302 { 303 struct mbuf *m; 304 305 splassert(IPL_SOFTNET); 306 307 if_down(&sc->sc_if); 308 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 309 sc->sc_devp = NULL; 310 sc->sc_xfer = 0; 311 for (;;) { 312 IF_DEQUEUE(&sc->sc_rawq, m); 313 if (m == NULL) 314 break; 315 m_freem(m); 316 } 317 for (;;) { 318 IF_DEQUEUE(&sc->sc_inq, m); 319 if (m == NULL) 320 break; 321 m_freem(m); 322 } 323 for (;;) { 324 IF_DEQUEUE(&sc->sc_fastq, m); 325 if (m == NULL) 326 break; 327 m_freem(m); 328 } 329 while ((m = sc->sc_npqueue) != NULL) { 330 sc->sc_npqueue = m->m_nextpkt; 331 m_freem(m); 332 } 333 if (sc->sc_togo != NULL) { 334 m_freem(sc->sc_togo); 335 sc->sc_togo = NULL; 336 } 337 #ifdef PPP_COMPRESS 338 ppp_ccp_closed(sc); 339 sc->sc_xc_state = NULL; 340 sc->sc_rc_state = NULL; 341 #endif /* PPP_COMPRESS */ 342 if (sc->sc_pass_filt.bf_insns != 0) { 343 FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); 344 sc->sc_pass_filt.bf_insns = 0; 345 sc->sc_pass_filt.bf_len = 0; 346 } 347 if (sc->sc_active_filt.bf_insns != 0) { 348 FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); 349 sc->sc_active_filt.bf_insns = 0; 350 sc->sc_active_filt.bf_len = 0; 351 } 352 #ifdef VJC 353 if (sc->sc_comp != 0) { 354 FREE(sc->sc_comp, M_DEVBUF); 355 sc->sc_comp = 0; 356 } 357 #endif 358 } 359 360 /* 361 * Ioctl routine for generic ppp devices. 362 */ 363 int 364 pppioctl(sc, cmd, data, flag, p) 365 struct ppp_softc *sc; 366 u_long cmd; 367 caddr_t data; 368 int flag; 369 struct proc *p; 370 { 371 int s, error, flags, mru, npx; 372 u_int nb; 373 struct ppp_option_data *odp; 374 struct compressor **cp; 375 struct npioctl *npi; 376 time_t t; 377 struct bpf_program *bp, *nbp; 378 struct bpf_insn *newcode, *oldcode; 379 int newcodelen; 380 #ifdef PPP_COMPRESS 381 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 382 #endif 383 384 switch (cmd) { 385 case FIONREAD: 386 *(int *)data = sc->sc_inq.ifq_len; 387 break; 388 389 case PPPIOCGUNIT: 390 *(int *)data = sc->sc_unit; /* XXX */ 391 break; 392 393 case PPPIOCGFLAGS: 394 *(u_int *)data = sc->sc_flags; 395 break; 396 397 case PPPIOCSFLAGS: 398 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 399 return (error); 400 flags = *(int *)data & SC_MASK; 401 s = splsoftnet(); 402 #ifdef PPP_COMPRESS 403 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 404 ppp_ccp_closed(sc); 405 #endif 406 splimp(); 407 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 408 splx(s); 409 break; 410 411 case PPPIOCSMRU: 412 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 413 return (error); 414 mru = *(int *)data; 415 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 416 sc->sc_mru = mru; 417 break; 418 419 case PPPIOCGMRU: 420 *(int *)data = sc->sc_mru; 421 break; 422 423 #ifdef VJC 424 case PPPIOCSMAXCID: 425 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 426 return (error); 427 if (sc->sc_comp) { 428 s = splsoftnet(); 429 sl_compress_setup(sc->sc_comp, *(int *)data); 430 splx(s); 431 } 432 break; 433 #endif 434 435 case PPPIOCXFERUNIT: 436 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 437 return (error); 438 sc->sc_xfer = p->p_pid; 439 break; 440 441 #ifdef PPP_COMPRESS 442 case PPPIOCSCOMPRESS: 443 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 444 return (error); 445 odp = (struct ppp_option_data *) data; 446 nb = odp->length; 447 if (nb > sizeof(ccp_option)) 448 nb = sizeof(ccp_option); 449 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 450 return (error); 451 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 452 return (EINVAL); 453 for (cp = ppp_compressors; *cp != NULL; ++cp) 454 if ((*cp)->compress_proto == ccp_option[0]) { 455 /* 456 * Found a handler for the protocol - try to allocate 457 * a compressor or decompressor. 458 */ 459 error = 0; 460 if (odp->transmit) { 461 s = splsoftnet(); 462 if (sc->sc_xc_state != NULL) 463 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 464 sc->sc_xcomp = *cp; 465 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 466 if (sc->sc_xc_state == NULL) { 467 if (sc->sc_flags & SC_DEBUG) 468 printf("%s: comp_alloc failed\n", 469 sc->sc_if.if_xname); 470 error = ENOBUFS; 471 } 472 splimp(); 473 sc->sc_flags &= ~SC_COMP_RUN; 474 splx(s); 475 } else { 476 s = splsoftnet(); 477 if (sc->sc_rc_state != NULL) 478 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 479 sc->sc_rcomp = *cp; 480 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 481 if (sc->sc_rc_state == NULL) { 482 if (sc->sc_flags & SC_DEBUG) 483 printf("%s: decomp_alloc failed\n", 484 sc->sc_if.if_xname); 485 error = ENOBUFS; 486 } 487 splimp(); 488 sc->sc_flags &= ~SC_DECOMP_RUN; 489 splx(s); 490 } 491 return (error); 492 } 493 if (sc->sc_flags & SC_DEBUG) 494 printf("%s: no compressor for [%x %x %x], %x\n", 495 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 496 ccp_option[2], nb); 497 return (EINVAL); /* no handler found */ 498 #endif /* PPP_COMPRESS */ 499 500 case PPPIOCGNPMODE: 501 case PPPIOCSNPMODE: 502 npi = (struct npioctl *) data; 503 switch (npi->protocol) { 504 case PPP_IP: 505 npx = NP_IP; 506 break; 507 default: 508 return EINVAL; 509 } 510 if (cmd == PPPIOCGNPMODE) { 511 npi->mode = sc->sc_npmode[npx]; 512 } else { 513 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 514 return (error); 515 if (npi->mode != sc->sc_npmode[npx]) { 516 s = splsoftnet(); 517 sc->sc_npmode[npx] = npi->mode; 518 if (npi->mode != NPMODE_QUEUE) { 519 ppp_requeue(sc); 520 (*sc->sc_start)(sc); 521 } 522 splx(s); 523 } 524 } 525 break; 526 527 case PPPIOCGIDLE: 528 s = splsoftnet(); 529 t = time.tv_sec; 530 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 531 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 532 splx(s); 533 break; 534 535 case PPPIOCSPASS: 536 case PPPIOCSACTIVE: 537 nbp = (struct bpf_program *) data; 538 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 539 return EINVAL; 540 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 541 if (newcodelen != 0) { 542 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 543 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 544 newcodelen)) != 0) { 545 FREE(newcode, M_DEVBUF); 546 return error; 547 } 548 if (!bpf_validate(newcode, nbp->bf_len)) { 549 FREE(newcode, M_DEVBUF); 550 return EINVAL; 551 } 552 } else 553 newcode = 0; 554 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 555 oldcode = bp->bf_insns; 556 s = splimp(); 557 bp->bf_len = nbp->bf_len; 558 bp->bf_insns = newcode; 559 splx(s); 560 if (oldcode != 0) 561 FREE(oldcode, M_DEVBUF); 562 break; 563 564 default: 565 return (-1); 566 } 567 return (0); 568 } 569 570 /* 571 * Process an ioctl request to the ppp network interface. 572 */ 573 static int 574 pppsioctl(ifp, cmd, data) 575 register struct ifnet *ifp; 576 u_long cmd; 577 caddr_t data; 578 { 579 register struct ppp_softc *sc = ifp->if_softc; 580 register struct ifaddr *ifa = (struct ifaddr *)data; 581 register struct ifreq *ifr = (struct ifreq *)data; 582 struct ppp_stats *psp; 583 #ifdef PPP_COMPRESS 584 struct ppp_comp_stats *pcp; 585 #endif 586 int s = splimp(), error = 0; 587 588 switch (cmd) { 589 case SIOCSIFFLAGS: 590 if ((ifp->if_flags & IFF_RUNNING) == 0) 591 ifp->if_flags &= ~IFF_UP; 592 break; 593 594 case SIOCSIFADDR: 595 if (ifa->ifa_addr->sa_family != AF_INET) 596 error = EAFNOSUPPORT; 597 break; 598 599 case SIOCSIFDSTADDR: 600 if (ifa->ifa_addr->sa_family != AF_INET) 601 error = EAFNOSUPPORT; 602 break; 603 604 case SIOCSIFMTU: 605 sc->sc_if.if_mtu = ifr->ifr_mtu; 606 break; 607 608 case SIOCADDMULTI: 609 case SIOCDELMULTI: 610 if (ifr == 0) { 611 error = EAFNOSUPPORT; 612 break; 613 } 614 switch(ifr->ifr_addr.sa_family) { 615 #ifdef INET 616 case AF_INET: 617 break; 618 #endif 619 default: 620 error = EAFNOSUPPORT; 621 break; 622 } 623 break; 624 625 case SIOCGPPPSTATS: 626 psp = &((struct ifpppstatsreq *) data)->stats; 627 bzero(psp, sizeof(*psp)); 628 psp->p = sc->sc_stats; 629 #if defined(VJC) && !defined(SL_NO_STATS) 630 if (sc->sc_comp) { 631 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 632 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 633 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 634 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 635 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 636 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 637 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 638 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 639 } 640 #endif /* VJC */ 641 break; 642 643 #ifdef PPP_COMPRESS 644 case SIOCGPPPCSTATS: 645 pcp = &((struct ifpppcstatsreq *) data)->stats; 646 bzero(pcp, sizeof(*pcp)); 647 if (sc->sc_xc_state != NULL) 648 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 649 if (sc->sc_rc_state != NULL) 650 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 651 break; 652 #endif /* PPP_COMPRESS */ 653 654 default: 655 error = EINVAL; 656 } 657 splx(s); 658 return (error); 659 } 660 661 /* 662 * Queue a packet. Start transmission if not active. 663 * Packet is placed in Information field of PPP frame. 664 */ 665 int 666 pppoutput(ifp, m0, dst, rtp) 667 struct ifnet *ifp; 668 struct mbuf *m0; 669 struct sockaddr *dst; 670 struct rtentry *rtp; 671 { 672 register struct ppp_softc *sc = ifp->if_softc; 673 int protocol, address, control; 674 u_char *cp; 675 int s, error; 676 struct ip *ip; 677 struct ifqueue *ifq; 678 enum NPmode mode; 679 int len; 680 struct mbuf *m; 681 682 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 683 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 684 error = ENETDOWN; /* sort of */ 685 goto bad; 686 } 687 688 /* 689 * Compute PPP header. 690 */ 691 m0->m_flags &= ~M_HIGHPRI; 692 switch (dst->sa_family) { 693 #ifdef INET 694 case AF_INET: 695 address = PPP_ALLSTATIONS; 696 control = PPP_UI; 697 protocol = PPP_IP; 698 mode = sc->sc_npmode[NP_IP]; 699 700 /* 701 * If this packet has the "low delay" bit set in the IP header, 702 * put it on the fastq instead. 703 */ 704 ip = mtod(m0, struct ip *); 705 if (ip->ip_tos & IPTOS_LOWDELAY) 706 m0->m_flags |= M_HIGHPRI; 707 break; 708 #endif 709 case AF_UNSPEC: 710 address = PPP_ADDRESS(dst->sa_data); 711 control = PPP_CONTROL(dst->sa_data); 712 protocol = PPP_PROTOCOL(dst->sa_data); 713 mode = NPMODE_PASS; 714 break; 715 default: 716 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 717 error = EAFNOSUPPORT; 718 goto bad; 719 } 720 721 /* 722 * Drop this packet, or return an error, if necessary. 723 */ 724 if (mode == NPMODE_ERROR) { 725 error = ENETDOWN; 726 goto bad; 727 } 728 if (mode == NPMODE_DROP) { 729 error = 0; 730 goto bad; 731 } 732 733 /* 734 * Add PPP header. If no space in first mbuf, allocate another. 735 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 736 */ 737 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 738 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 739 if (m0 == 0) { 740 error = ENOBUFS; 741 goto bad; 742 } 743 m0->m_len = 0; 744 } else 745 m0->m_data -= PPP_HDRLEN; 746 747 cp = mtod(m0, u_char *); 748 *cp++ = address; 749 *cp++ = control; 750 *cp++ = protocol >> 8; 751 *cp++ = protocol & 0xff; 752 m0->m_len += PPP_HDRLEN; 753 754 len = 0; 755 for (m = m0; m != 0; m = m->m_next) 756 len += m->m_len; 757 758 if (sc->sc_flags & SC_LOG_OUTPKT) { 759 printf("%s output: ", ifp->if_xname); 760 pppdumpm(m0); 761 } 762 763 if ((protocol & 0x8000) == 0) { 764 /* 765 * Apply the pass and active filters to the packet, 766 * but only if it is a data packet. 767 */ 768 *mtod(m0, u_char *) = 1; /* indicates outbound */ 769 if (sc->sc_pass_filt.bf_insns != 0 770 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 771 len, 0) == 0) { 772 error = 0; /* drop this packet */ 773 goto bad; 774 } 775 776 /* 777 * Update the time we sent the most recent packet. 778 */ 779 if (sc->sc_active_filt.bf_insns == 0 780 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 781 sc->sc_last_sent = time.tv_sec; 782 783 *mtod(m0, u_char *) = address; 784 } 785 786 #if NBPFILTER > 0 787 /* 788 * See if bpf wants to look at the packet. 789 */ 790 if (sc->sc_bpf) 791 bpf_mtap(sc->sc_bpf, m0); 792 #endif 793 794 /* 795 * Put the packet on the appropriate queue. 796 */ 797 s = splsoftnet(); 798 if (mode == NPMODE_QUEUE) { 799 /* XXX we should limit the number of packets on this queue */ 800 *sc->sc_npqtail = m0; 801 m0->m_nextpkt = NULL; 802 sc->sc_npqtail = &m0->m_nextpkt; 803 } else { 804 if ((m0->m_flags & M_HIGHPRI) 805 #ifdef ALTQ 806 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 807 #endif 808 ) { 809 ifq = &sc->sc_fastq; 810 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 811 IF_DROP(ifq); 812 m_freem(m0); 813 error = ENOBUFS; 814 } 815 else { 816 IF_ENQUEUE(ifq, m0); 817 error = 0; 818 } 819 } else 820 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, NULL, error); 821 if (error) { 822 splx(s); 823 sc->sc_if.if_oerrors++; 824 sc->sc_stats.ppp_oerrors++; 825 return (error); 826 } 827 (*sc->sc_start)(sc); 828 } 829 ifp->if_opackets++; 830 ifp->if_obytes += len; 831 832 splx(s); 833 return (0); 834 835 bad: 836 m_freem(m0); 837 return (error); 838 } 839 840 /* 841 * After a change in the NPmode for some NP, move packets from the 842 * npqueue to the send queue or the fast queue as appropriate. 843 * Should be called at splsoftnet. 844 */ 845 static void 846 ppp_requeue(sc) 847 struct ppp_softc *sc; 848 { 849 struct mbuf *m, **mpp; 850 struct ifqueue *ifq; 851 enum NPmode mode; 852 int error; 853 854 splassert(IPL_SOFTNET); 855 856 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 857 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 858 case PPP_IP: 859 mode = sc->sc_npmode[NP_IP]; 860 break; 861 default: 862 mode = NPMODE_PASS; 863 } 864 865 switch (mode) { 866 case NPMODE_PASS: 867 /* 868 * This packet can now go on one of the queues to be sent. 869 */ 870 *mpp = m->m_nextpkt; 871 m->m_nextpkt = NULL; 872 if ((m->m_flags & M_HIGHPRI) 873 #ifdef ALTQ 874 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 875 #endif 876 ) { 877 ifq = &sc->sc_fastq; 878 if (IF_QFULL(ifq)) { 879 IF_DROP(ifq); 880 m_freem(m); 881 error = ENOBUFS; 882 } 883 else { 884 IF_ENQUEUE(ifq, m); 885 error = 0; 886 } 887 } else 888 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 889 if (error) { 890 sc->sc_if.if_oerrors++; 891 sc->sc_stats.ppp_oerrors++; 892 } 893 break; 894 895 case NPMODE_DROP: 896 case NPMODE_ERROR: 897 *mpp = m->m_nextpkt; 898 m_freem(m); 899 break; 900 901 case NPMODE_QUEUE: 902 mpp = &m->m_nextpkt; 903 break; 904 } 905 } 906 sc->sc_npqtail = mpp; 907 } 908 909 /* 910 * Transmitter has finished outputting some stuff; 911 * remember to call sc->sc_start later at splsoftnet. 912 */ 913 void 914 ppp_restart(sc) 915 struct ppp_softc *sc; 916 { 917 int s = splimp(); 918 919 sc->sc_flags &= ~SC_TBUSY; 920 schednetisr(NETISR_PPP); 921 splx(s); 922 } 923 924 /* 925 * Get a packet to send. This procedure is intended to be called at 926 * splsoftnet, since it may involve time-consuming operations such as 927 * applying VJ compression, packet compression, address/control and/or 928 * protocol field compression to the packet. 929 */ 930 struct mbuf * 931 ppp_dequeue(sc) 932 struct ppp_softc *sc; 933 { 934 struct mbuf *m, *mp; 935 u_char *cp; 936 int address, control, protocol; 937 938 /* 939 * Grab a packet to send: first try the fast queue, then the 940 * normal queue. 941 */ 942 IF_DEQUEUE(&sc->sc_fastq, m); 943 if (m == NULL) 944 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 945 if (m == NULL) 946 return NULL; 947 948 ++sc->sc_stats.ppp_opackets; 949 950 /* 951 * Extract the ppp header of the new packet. 952 * The ppp header will be in one mbuf. 953 */ 954 cp = mtod(m, u_char *); 955 address = PPP_ADDRESS(cp); 956 control = PPP_CONTROL(cp); 957 protocol = PPP_PROTOCOL(cp); 958 959 switch (protocol) { 960 case PPP_IP: 961 #ifdef VJC 962 /* 963 * If the packet is a TCP/IP packet, see if we can compress it. 964 */ 965 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 966 struct ip *ip; 967 int type; 968 969 mp = m; 970 ip = (struct ip *) (cp + PPP_HDRLEN); 971 if (mp->m_len <= PPP_HDRLEN) { 972 mp = mp->m_next; 973 if (mp == NULL) 974 break; 975 ip = mtod(mp, struct ip *); 976 } 977 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 978 if (ip->ip_p == IPPROTO_TCP) { 979 type = sl_compress_tcp(mp, ip, sc->sc_comp, 980 !(sc->sc_flags & SC_NO_TCP_CCID)); 981 switch (type) { 982 case TYPE_UNCOMPRESSED_TCP: 983 protocol = PPP_VJC_UNCOMP; 984 break; 985 case TYPE_COMPRESSED_TCP: 986 protocol = PPP_VJC_COMP; 987 cp = mtod(m, u_char *); 988 cp[0] = address; /* header has moved */ 989 cp[1] = control; 990 cp[2] = 0; 991 break; 992 } 993 cp[3] = protocol; /* update protocol in PPP header */ 994 } 995 } 996 #endif /* VJC */ 997 break; 998 999 #ifdef PPP_COMPRESS 1000 case PPP_CCP: 1001 ppp_ccp(sc, m, 0); 1002 break; 1003 #endif /* PPP_COMPRESS */ 1004 } 1005 1006 #ifdef PPP_COMPRESS 1007 if (protocol != PPP_LCP && protocol != PPP_CCP 1008 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1009 struct mbuf *mcomp = NULL; 1010 int slen, clen; 1011 1012 slen = 0; 1013 for (mp = m; mp != NULL; mp = mp->m_next) 1014 slen += mp->m_len; 1015 clen = (*sc->sc_xcomp->compress) 1016 (sc->sc_xc_state, &mcomp, m, slen, 1017 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 1018 if (mcomp != NULL) { 1019 if (sc->sc_flags & SC_CCP_UP) { 1020 /* Send the compressed packet instead of the original. */ 1021 m_freem(m); 1022 m = mcomp; 1023 cp = mtod(m, u_char *); 1024 protocol = cp[3]; 1025 } else { 1026 /* Can't transmit compressed packets until CCP is up. */ 1027 m_freem(mcomp); 1028 } 1029 } 1030 } 1031 #endif /* PPP_COMPRESS */ 1032 1033 /* 1034 * Compress the address/control and protocol, if possible. 1035 */ 1036 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1037 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1038 protocol != PPP_LCP) { 1039 /* can compress address/control */ 1040 m->m_data += 2; 1041 m->m_len -= 2; 1042 } 1043 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1044 /* can compress protocol */ 1045 if (mtod(m, u_char *) == cp) { 1046 cp[2] = cp[1]; /* move address/control up */ 1047 cp[1] = cp[0]; 1048 } 1049 ++m->m_data; 1050 --m->m_len; 1051 } 1052 1053 return m; 1054 } 1055 1056 /* 1057 * Software interrupt routine, called at splsoftnet. 1058 */ 1059 void 1060 pppintr() 1061 { 1062 struct ppp_softc *sc; 1063 int i, s, s2; 1064 struct mbuf *m; 1065 1066 splassert(IPL_SOFTNET); 1067 1068 sc = ppp_softc; 1069 s = splsoftnet(); /* XXX - what's the point of this? see comment above */ 1070 for (i = 0; i < NPPP; ++i, ++sc) { 1071 if (!(sc->sc_flags & SC_TBUSY) 1072 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head)) { 1073 s2 = splimp(); 1074 sc->sc_flags |= SC_TBUSY; 1075 splx(s2); 1076 (*sc->sc_start)(sc); 1077 } 1078 for (;;) { 1079 s2 = splimp(); 1080 IF_DEQUEUE(&sc->sc_rawq, m); 1081 splx(s2); 1082 if (m == NULL) 1083 break; 1084 ppp_inproc(sc, m); 1085 } 1086 } 1087 splx(s); 1088 } 1089 1090 #ifdef PPP_COMPRESS 1091 /* 1092 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1093 * 0 if it is about to be transmitted. 1094 */ 1095 static void 1096 ppp_ccp(sc, m, rcvd) 1097 struct ppp_softc *sc; 1098 struct mbuf *m; 1099 int rcvd; 1100 { 1101 u_char *dp, *ep; 1102 struct mbuf *mp; 1103 int slen, s; 1104 1105 /* 1106 * Get a pointer to the data after the PPP header. 1107 */ 1108 if (m->m_len <= PPP_HDRLEN) { 1109 mp = m->m_next; 1110 if (mp == NULL) 1111 return; 1112 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1113 } else { 1114 mp = m; 1115 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1116 } 1117 1118 ep = mtod(mp, u_char *) + mp->m_len; 1119 if (dp + CCP_HDRLEN > ep) 1120 return; 1121 slen = CCP_LENGTH(dp); 1122 if (dp + slen > ep) { 1123 if (sc->sc_flags & SC_DEBUG) 1124 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1125 dp, slen, mtod(mp, u_char *), mp->m_len); 1126 return; 1127 } 1128 1129 switch (CCP_CODE(dp)) { 1130 case CCP_CONFREQ: 1131 case CCP_TERMREQ: 1132 case CCP_TERMACK: 1133 /* CCP must be going down - disable compression */ 1134 if (sc->sc_flags & SC_CCP_UP) { 1135 s = splimp(); 1136 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1137 splx(s); 1138 } 1139 break; 1140 1141 case CCP_CONFACK: 1142 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1143 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1144 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1145 if (!rcvd) { 1146 /* we're agreeing to send compressed packets. */ 1147 if (sc->sc_xc_state != NULL 1148 && (*sc->sc_xcomp->comp_init) 1149 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1150 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1151 s = splimp(); 1152 sc->sc_flags |= SC_COMP_RUN; 1153 splx(s); 1154 } 1155 } else { 1156 /* peer is agreeing to send compressed packets. */ 1157 if (sc->sc_rc_state != NULL 1158 && (*sc->sc_rcomp->decomp_init) 1159 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1160 sc->sc_unit, 0, sc->sc_mru, 1161 sc->sc_flags & SC_DEBUG)) { 1162 s = splimp(); 1163 sc->sc_flags |= SC_DECOMP_RUN; 1164 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1165 splx(s); 1166 } 1167 } 1168 } 1169 break; 1170 1171 case CCP_RESETACK: 1172 if (sc->sc_flags & SC_CCP_UP) { 1173 if (!rcvd) { 1174 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1175 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1176 } else { 1177 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1178 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1179 s = splimp(); 1180 sc->sc_flags &= ~SC_DC_ERROR; 1181 splx(s); 1182 } 1183 } 1184 } 1185 break; 1186 } 1187 } 1188 1189 /* 1190 * CCP is down; free (de)compressor state if necessary. 1191 */ 1192 static void 1193 ppp_ccp_closed(sc) 1194 struct ppp_softc *sc; 1195 { 1196 if (sc->sc_xc_state) { 1197 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1198 sc->sc_xc_state = NULL; 1199 } 1200 if (sc->sc_rc_state) { 1201 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1202 sc->sc_rc_state = NULL; 1203 } 1204 } 1205 #endif /* PPP_COMPRESS */ 1206 1207 /* 1208 * PPP packet input routine. 1209 * The caller has checked and removed the FCS and has inserted 1210 * the address/control bytes and the protocol high byte if they 1211 * were omitted. 1212 */ 1213 void 1214 ppppktin(sc, m, lost) 1215 struct ppp_softc *sc; 1216 struct mbuf *m; 1217 int lost; 1218 { 1219 int s = splimp(); 1220 1221 if (lost) 1222 m->m_flags |= M_ERRMARK; 1223 IF_ENQUEUE(&sc->sc_rawq, m); 1224 schednetisr(NETISR_PPP); 1225 splx(s); 1226 } 1227 1228 /* 1229 * Process a received PPP packet, doing decompression as necessary. 1230 * Should be called at splsoftnet. 1231 */ 1232 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1233 TYPE_UNCOMPRESSED_TCP) 1234 1235 static void 1236 ppp_inproc(sc, m) 1237 struct ppp_softc *sc; 1238 struct mbuf *m; 1239 { 1240 struct ifnet *ifp = &sc->sc_if; 1241 struct ifqueue *inq; 1242 int s, ilen, xlen, proto, rv; 1243 u_char *cp, adrs, ctrl; 1244 struct mbuf *mp, *dmp = NULL; 1245 u_char *iphdr; 1246 u_int hlen; 1247 1248 sc->sc_stats.ppp_ipackets++; 1249 1250 if (sc->sc_flags & SC_LOG_INPKT) { 1251 ilen = 0; 1252 for (mp = m; mp != NULL; mp = mp->m_next) 1253 ilen += mp->m_len; 1254 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1255 pppdumpm(m); 1256 } 1257 1258 cp = mtod(m, u_char *); 1259 adrs = PPP_ADDRESS(cp); 1260 ctrl = PPP_CONTROL(cp); 1261 proto = PPP_PROTOCOL(cp); 1262 1263 if (m->m_flags & M_ERRMARK) { 1264 m->m_flags &= ~M_ERRMARK; 1265 s = splimp(); 1266 sc->sc_flags |= SC_VJ_RESET; 1267 splx(s); 1268 } 1269 1270 #ifdef PPP_COMPRESS 1271 /* 1272 * Decompress this packet if necessary, update the receiver's 1273 * dictionary, or take appropriate action on a CCP packet. 1274 */ 1275 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1276 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1277 /* decompress this packet */ 1278 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1279 if (rv == DECOMP_OK) { 1280 m_freem(m); 1281 if (dmp == NULL) { 1282 /* no error, but no decompressed packet produced */ 1283 return; 1284 } 1285 m = dmp; 1286 cp = mtod(m, u_char *); 1287 proto = PPP_PROTOCOL(cp); 1288 1289 } else { 1290 /* 1291 * An error has occurred in decompression. 1292 * Pass the compressed packet up to pppd, which may take 1293 * CCP down or issue a Reset-Req. 1294 */ 1295 if (sc->sc_flags & SC_DEBUG) 1296 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1297 s = splimp(); 1298 sc->sc_flags |= SC_VJ_RESET; 1299 if (rv == DECOMP_ERROR) 1300 sc->sc_flags |= SC_DC_ERROR; 1301 else 1302 sc->sc_flags |= SC_DC_FERROR; 1303 splx(s); 1304 } 1305 1306 } else { 1307 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1308 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1309 } 1310 if (proto == PPP_CCP) { 1311 ppp_ccp(sc, m, 1); 1312 } 1313 } 1314 #endif 1315 1316 ilen = 0; 1317 for (mp = m; mp != NULL; mp = mp->m_next) 1318 ilen += mp->m_len; 1319 1320 #ifdef VJC 1321 if (sc->sc_flags & SC_VJ_RESET) { 1322 /* 1323 * If we've missed a packet, we must toss subsequent compressed 1324 * packets which don't have an explicit connection ID. 1325 */ 1326 if (sc->sc_comp) 1327 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1328 s = splimp(); 1329 sc->sc_flags &= ~SC_VJ_RESET; 1330 splx(s); 1331 } 1332 1333 /* 1334 * See if we have a VJ-compressed packet to uncompress. 1335 */ 1336 if (proto == PPP_VJC_COMP) { 1337 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1338 goto bad; 1339 1340 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1341 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1342 sc->sc_comp, &iphdr, &hlen); 1343 1344 if (xlen <= 0) { 1345 if (sc->sc_flags & SC_DEBUG) 1346 printf("%s: VJ uncompress failed on type comp\n", 1347 ifp->if_xname); 1348 goto bad; 1349 } 1350 1351 /* Copy the PPP and IP headers into a new mbuf. */ 1352 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1353 if (mp == NULL) 1354 goto bad; 1355 mp->m_len = 0; 1356 mp->m_next = NULL; 1357 if (hlen + PPP_HDRLEN > MHLEN) { 1358 MCLGET(mp, M_DONTWAIT); 1359 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1360 m_freem(mp); 1361 goto bad; /* lose if big headers and no clusters */ 1362 } 1363 } 1364 if (m->m_flags & M_PKTHDR) 1365 M_MOVE_HDR(mp, m); 1366 cp = mtod(mp, u_char *); 1367 cp[0] = adrs; 1368 cp[1] = ctrl; 1369 cp[2] = 0; 1370 cp[3] = PPP_IP; 1371 proto = PPP_IP; 1372 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1373 mp->m_len = hlen + PPP_HDRLEN; 1374 1375 /* 1376 * Trim the PPP and VJ headers off the old mbuf 1377 * and stick the new and old mbufs together. 1378 */ 1379 m->m_data += PPP_HDRLEN + xlen; 1380 m->m_len -= PPP_HDRLEN + xlen; 1381 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1382 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1383 mp->m_len += m->m_len; 1384 MFREE(m, mp->m_next); 1385 } else 1386 mp->m_next = m; 1387 m = mp; 1388 ilen += hlen - xlen; 1389 1390 } else if (proto == PPP_VJC_UNCOMP) { 1391 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1392 goto bad; 1393 1394 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1395 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1396 sc->sc_comp, &iphdr, &hlen); 1397 1398 if (xlen < 0) { 1399 if (sc->sc_flags & SC_DEBUG) 1400 printf("%s: VJ uncompress failed on type uncomp\n", 1401 ifp->if_xname); 1402 goto bad; 1403 } 1404 1405 proto = PPP_IP; 1406 cp[3] = PPP_IP; 1407 } 1408 #endif /* VJC */ 1409 1410 /* 1411 * If the packet will fit in a header mbuf, don't waste a 1412 * whole cluster on it. 1413 */ 1414 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1415 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1416 if (mp != NULL) { 1417 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1418 m_freem(m); 1419 m = mp; 1420 m->m_len = ilen; 1421 } 1422 } 1423 m->m_pkthdr.len = ilen; 1424 m->m_pkthdr.rcvif = ifp; 1425 1426 if ((proto & 0x8000) == 0) { 1427 /* 1428 * See whether we want to pass this packet, and 1429 * if it counts as link activity. 1430 */ 1431 adrs = *mtod(m, u_char *); /* save address field */ 1432 *mtod(m, u_char *) = 0; /* indicate inbound */ 1433 if (sc->sc_pass_filt.bf_insns != 0 1434 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1435 ilen, 0) == 0) { 1436 /* drop this packet */ 1437 m_freem(m); 1438 return; 1439 } 1440 if (sc->sc_active_filt.bf_insns == 0 1441 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1442 sc->sc_last_recv = time.tv_sec; 1443 1444 *mtod(m, u_char *) = adrs; 1445 } 1446 1447 #if NBPFILTER > 0 1448 /* See if bpf wants to look at the packet. */ 1449 if (sc->sc_bpf) 1450 bpf_mtap(sc->sc_bpf, m); 1451 #endif 1452 1453 rv = 0; 1454 switch (proto) { 1455 #ifdef INET 1456 case PPP_IP: 1457 /* 1458 * IP packet - take off the ppp header and pass it up to IP. 1459 */ 1460 if ((ifp->if_flags & IFF_UP) == 0 1461 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1462 /* interface is down - drop the packet. */ 1463 m_freem(m); 1464 return; 1465 } 1466 m->m_pkthdr.len -= PPP_HDRLEN; 1467 m->m_data += PPP_HDRLEN; 1468 m->m_len -= PPP_HDRLEN; 1469 schednetisr(NETISR_IP); 1470 inq = &ipintrq; 1471 break; 1472 #endif 1473 1474 default: 1475 /* 1476 * Some other protocol - place on input queue for read(). 1477 */ 1478 inq = &sc->sc_inq; 1479 rv = 1; 1480 break; 1481 } 1482 1483 /* 1484 * Put the packet on the appropriate input queue. 1485 */ 1486 s = splimp(); 1487 if (IF_QFULL(inq)) { 1488 IF_DROP(inq); 1489 splx(s); 1490 if (sc->sc_flags & SC_DEBUG) 1491 printf("%s: input queue full\n", ifp->if_xname); 1492 ifp->if_iqdrops++; 1493 goto bad; 1494 } 1495 IF_ENQUEUE(inq, m); 1496 splx(s); 1497 ifp->if_ipackets++; 1498 ifp->if_ibytes += ilen; 1499 1500 if (rv) 1501 (*sc->sc_ctlp)(sc); 1502 1503 return; 1504 1505 bad: 1506 m_freem(m); 1507 sc->sc_if.if_ierrors++; 1508 sc->sc_stats.ppp_ierrors++; 1509 } 1510 1511 #define MAX_DUMP_BYTES 128 1512 1513 static void 1514 pppdumpm(m0) 1515 struct mbuf *m0; 1516 { 1517 char buf[3*MAX_DUMP_BYTES+4]; 1518 char *bp = buf; 1519 struct mbuf *m; 1520 static char digits[] = "0123456789abcdef"; 1521 1522 for (m = m0; m; m = m->m_next) { 1523 int l = m->m_len; 1524 u_char *rptr = (u_char *)m->m_data; 1525 1526 while (l--) { 1527 if (bp > buf + sizeof(buf) - 4) 1528 goto done; 1529 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1530 *bp++ = digits[*rptr++ & 0xf]; 1531 } 1532 1533 if (m->m_next) { 1534 if (bp > buf + sizeof(buf) - 3) 1535 goto done; 1536 *bp++ = '|'; 1537 } else 1538 *bp++ = ' '; 1539 } 1540 done: 1541 if (m) 1542 *bp++ = '>'; 1543 *bp = 0; 1544 printf("%s\n", buf); 1545 } 1546 1547 #ifdef ALTQ 1548 /* 1549 * a wrapper to transmit a packet from if_start since ALTQ uses 1550 * if_start to send a packet. 1551 */ 1552 static void 1553 ppp_ifstart(ifp) 1554 struct ifnet *ifp; 1555 { 1556 struct ppp_softc *sc; 1557 1558 sc = ifp->if_softc; 1559 (*sc->sc_start)(sc); 1560 } 1561 #endif 1562 1563 #endif /* NPPP > 0 */ 1564