1 /* $OpenBSD: if_ppp.c,v 1.24 2001/07/20 22:47:15 mickey 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) 1989 Carnegie Mellon University. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms are permitted 11 * provided that the above copyright notice and this paragraph are 12 * duplicated in all such forms and that any documentation, 13 * advertising materials, and other materials related to such 14 * distribution and use acknowledge that the software was developed 15 * by Carnegie Mellon University. The name of the 16 * University may not be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 20 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 21 * 22 * Drew D. Perkins 23 * Carnegie Mellon University 24 * 4910 Forbes Ave. 25 * Pittsburgh, PA 15213 26 * (412) 268-8576 27 * ddp@andrew.cmu.edu 28 * 29 * Based on: 30 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 31 * 32 * Copyright (c) 1987 Regents of the University of California. 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms are permitted 36 * provided that the above copyright notice and this paragraph are 37 * duplicated in all such forms and that any documentation, 38 * advertising materials, and other materials related to such 39 * distribution and use acknowledge that the software was developed 40 * by the University of California, Berkeley. The name of the 41 * University may not be used to endorse or promote products derived 42 * from this software without specific prior written permission. 43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 44 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 45 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 46 * 47 * Serial Line interface 48 * 49 * Rick Adams 50 * Center for Seismic Studies 51 * 1300 N 17th Street, Suite 1450 52 * Arlington, Virginia 22209 53 * (703)276-7900 54 * rick@seismo.ARPA 55 * seismo!rick 56 * 57 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). 58 * Converted to 4.3BSD Beta by Chris Torek. 59 * Other changes made at Berkeley, based in part on code by Kirk Smith. 60 * 61 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) 62 * Added VJ tcp header compression; more unified ioctls 63 * 64 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). 65 * Cleaned up a lot of the mbuf-related code to fix bugs that 66 * caused system crashes and packet corruption. Changed pppstart 67 * so that it doesn't just give up with a collision if the whole 68 * packet doesn't fit in the output ring buffer. 69 * 70 * Added priority queueing for interactive IP packets, following 71 * the model of if_sl.c, plus hooks for bpf. 72 * Paul Mackerras (paulus@cs.anu.edu.au). 73 */ 74 75 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 76 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 77 78 #include "ppp.h" 79 #if NPPP > 0 80 81 #define VJC 82 #define PPP_COMPRESS 83 84 #include <sys/param.h> 85 #include <sys/proc.h> 86 #include <sys/mbuf.h> 87 #include <sys/socket.h> 88 #include <sys/ioctl.h> 89 #include <sys/kernel.h> 90 #include <sys/systm.h> 91 #include <sys/time.h> 92 #include <sys/malloc.h> 93 94 #include <net/if.h> 95 #include <net/if_types.h> 96 #include <net/netisr.h> 97 #include <net/route.h> 98 #include <net/bpf.h> 99 100 #if INET 101 #include <netinet/in.h> 102 #include <netinet/in_systm.h> 103 #include <netinet/in_var.h> 104 #include <netinet/ip.h> 105 #else 106 #ifdef _KERNEL 107 #ifdef VJC 108 #error ppp device with VJC assumes INET 109 #endif 110 #endif 111 #endif 112 113 #include "bpfilter.h" 114 #if NBPFILTER > 0 115 #include <sys/time.h> 116 #include <net/bpf.h> 117 #endif 118 119 #ifdef VJC 120 #include <net/slcompress.h> 121 #endif 122 123 #include <net/ppp_defs.h> 124 #include <net/if_ppp.h> 125 #include <net/if_pppvar.h> 126 #include <machine/cpu.h> 127 128 #ifdef PPP_COMPRESS 129 #define PACKETPTR struct mbuf * 130 #include <net/ppp-comp.h> 131 #endif 132 133 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 134 static void ppp_requeue __P((struct ppp_softc *)); 135 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 136 static void ppp_ccp_closed __P((struct ppp_softc *)); 137 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 138 static void pppdumpm __P((struct mbuf *m0)); 139 140 /* 141 * Some useful mbuf macros not in mbuf.h. 142 */ 143 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 144 145 #define M_DATASTART(m) \ 146 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 147 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 148 149 #define M_DATASIZE(m) \ 150 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 151 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 152 153 /* 154 * We steal two bits in the mbuf m_flags, to mark high-priority packets 155 * for output, and received packets following lost/corrupted packets. 156 */ 157 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 158 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 159 160 161 #ifdef PPP_COMPRESS 162 /* 163 * List of compressors we know about. 164 * We leave some space so maybe we can modload compressors. 165 */ 166 167 extern struct compressor ppp_bsd_compress; 168 extern struct compressor ppp_deflate, ppp_deflate_draft; 169 170 struct compressor *ppp_compressors[8] = { 171 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 172 &ppp_bsd_compress, 173 #endif 174 #if DO_DEFLATE && defined(PPP_DEFLATE) 175 &ppp_deflate, 176 &ppp_deflate_draft, 177 #endif 178 NULL 179 }; 180 #endif /* PPP_COMPRESS */ 181 182 183 /* 184 * Called from boot code to establish ppp interfaces. 185 */ 186 void 187 pppattach() 188 { 189 extern int ifqmaxlen; 190 register struct ppp_softc *sc; 191 register int i = 0; 192 193 for (sc = ppp_softc; i < NPPP; sc++) { 194 sc->sc_unit = i; /* XXX */ 195 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 196 sc->sc_if.if_softc = sc; 197 sc->sc_if.if_mtu = PPP_MTU; 198 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 199 sc->sc_if.if_type = IFT_PPP; 200 sc->sc_if.if_hdrlen = PPP_HDRLEN; 201 sc->sc_if.if_ioctl = pppsioctl; 202 sc->sc_if.if_output = pppoutput; 203 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, ifqmaxlen); 204 sc->sc_inq.ifq_maxlen = ifqmaxlen; 205 sc->sc_fastq.ifq_maxlen = ifqmaxlen; 206 sc->sc_rawq.ifq_maxlen = ifqmaxlen; 207 IFQ_SET_READY(&sc->sc_if.if_snd); 208 if_attach(&sc->sc_if); 209 #if NBPFILTER > 0 210 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 211 #endif 212 } 213 } 214 215 /* 216 * Allocate a ppp interface unit and initialize it. 217 */ 218 struct ppp_softc * 219 pppalloc(pid) 220 pid_t pid; 221 { 222 int nppp, i; 223 struct ppp_softc *sc; 224 225 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 226 if (sc->sc_xfer == pid) { 227 sc->sc_xfer = 0; 228 return sc; 229 } 230 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 231 if (sc->sc_devp == NULL) 232 break; 233 if (nppp >= NPPP) 234 return NULL; 235 236 sc->sc_flags = 0; 237 sc->sc_mru = PPP_MRU; 238 sc->sc_relinq = NULL; 239 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 240 #ifdef VJC 241 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 242 M_DEVBUF, M_NOWAIT); 243 if (sc->sc_comp) 244 sl_compress_init(sc->sc_comp); 245 #endif 246 #ifdef PPP_COMPRESS 247 sc->sc_xc_state = NULL; 248 sc->sc_rc_state = NULL; 249 #endif /* PPP_COMPRESS */ 250 for (i = 0; i < NUM_NP; ++i) 251 sc->sc_npmode[i] = NPMODE_ERROR; 252 sc->sc_npqueue = NULL; 253 sc->sc_npqtail = &sc->sc_npqueue; 254 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 255 256 return sc; 257 } 258 259 /* 260 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 261 */ 262 void 263 pppdealloc(sc) 264 struct ppp_softc *sc; 265 { 266 struct mbuf *m; 267 268 if_down(&sc->sc_if); 269 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 270 sc->sc_devp = NULL; 271 sc->sc_xfer = 0; 272 for (;;) { 273 IF_DEQUEUE(&sc->sc_rawq, m); 274 if (m == NULL) 275 break; 276 m_freem(m); 277 } 278 for (;;) { 279 IF_DEQUEUE(&sc->sc_inq, m); 280 if (m == NULL) 281 break; 282 m_freem(m); 283 } 284 for (;;) { 285 IF_DEQUEUE(&sc->sc_fastq, m); 286 if (m == NULL) 287 break; 288 m_freem(m); 289 } 290 while ((m = sc->sc_npqueue) != NULL) { 291 sc->sc_npqueue = m->m_nextpkt; 292 m_freem(m); 293 } 294 if (sc->sc_togo != NULL) { 295 m_freem(sc->sc_togo); 296 sc->sc_togo = NULL; 297 } 298 #ifdef PPP_COMPRESS 299 ppp_ccp_closed(sc); 300 sc->sc_xc_state = NULL; 301 sc->sc_rc_state = NULL; 302 #endif /* PPP_COMPRESS */ 303 if (sc->sc_pass_filt.bf_insns != 0) { 304 FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); 305 sc->sc_pass_filt.bf_insns = 0; 306 sc->sc_pass_filt.bf_len = 0; 307 } 308 if (sc->sc_active_filt.bf_insns != 0) { 309 FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); 310 sc->sc_active_filt.bf_insns = 0; 311 sc->sc_active_filt.bf_len = 0; 312 } 313 #ifdef VJC 314 if (sc->sc_comp != 0) { 315 FREE(sc->sc_comp, M_DEVBUF); 316 sc->sc_comp = 0; 317 } 318 #endif 319 } 320 321 /* 322 * Ioctl routine for generic ppp devices. 323 */ 324 int 325 pppioctl(sc, cmd, data, flag, p) 326 struct ppp_softc *sc; 327 u_long cmd; 328 caddr_t data; 329 int flag; 330 struct proc *p; 331 { 332 int s, error, flags, mru, nb, npx; 333 struct ppp_option_data *odp; 334 struct compressor **cp; 335 struct npioctl *npi; 336 time_t t; 337 struct bpf_program *bp, *nbp; 338 struct bpf_insn *newcode, *oldcode; 339 int newcodelen; 340 #ifdef PPP_COMPRESS 341 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 342 #endif 343 344 switch (cmd) { 345 case FIONREAD: 346 *(int *)data = sc->sc_inq.ifq_len; 347 break; 348 349 case PPPIOCGUNIT: 350 *(int *)data = sc->sc_unit; /* XXX */ 351 break; 352 353 case PPPIOCGFLAGS: 354 *(u_int *)data = sc->sc_flags; 355 break; 356 357 case PPPIOCSFLAGS: 358 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 359 return (error); 360 flags = *(int *)data & SC_MASK; 361 s = splsoftnet(); 362 #ifdef PPP_COMPRESS 363 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 364 ppp_ccp_closed(sc); 365 #endif 366 splimp(); 367 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 368 splx(s); 369 break; 370 371 case PPPIOCSMRU: 372 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 373 return (error); 374 mru = *(int *)data; 375 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 376 sc->sc_mru = mru; 377 break; 378 379 case PPPIOCGMRU: 380 *(int *)data = sc->sc_mru; 381 break; 382 383 #ifdef VJC 384 case PPPIOCSMAXCID: 385 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 386 return (error); 387 if (sc->sc_comp) { 388 s = splsoftnet(); 389 sl_compress_setup(sc->sc_comp, *(int *)data); 390 splx(s); 391 } 392 break; 393 #endif 394 395 case PPPIOCXFERUNIT: 396 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 397 return (error); 398 sc->sc_xfer = p->p_pid; 399 break; 400 401 #ifdef PPP_COMPRESS 402 case PPPIOCSCOMPRESS: 403 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 404 return (error); 405 odp = (struct ppp_option_data *) data; 406 nb = odp->length; 407 if (nb > sizeof(ccp_option)) 408 nb = sizeof(ccp_option); 409 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 410 return (error); 411 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 412 return (EINVAL); 413 for (cp = ppp_compressors; *cp != NULL; ++cp) 414 if ((*cp)->compress_proto == ccp_option[0]) { 415 /* 416 * Found a handler for the protocol - try to allocate 417 * a compressor or decompressor. 418 */ 419 error = 0; 420 if (odp->transmit) { 421 s = splsoftnet(); 422 if (sc->sc_xc_state != NULL) 423 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 424 sc->sc_xcomp = *cp; 425 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 426 if (sc->sc_xc_state == NULL) { 427 if (sc->sc_flags & SC_DEBUG) 428 printf("%s: comp_alloc failed\n", 429 sc->sc_if.if_xname); 430 error = ENOBUFS; 431 } 432 splimp(); 433 sc->sc_flags &= ~SC_COMP_RUN; 434 splx(s); 435 } else { 436 s = splsoftnet(); 437 if (sc->sc_rc_state != NULL) 438 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 439 sc->sc_rcomp = *cp; 440 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 441 if (sc->sc_rc_state == NULL) { 442 if (sc->sc_flags & SC_DEBUG) 443 printf("%s: decomp_alloc failed\n", 444 sc->sc_if.if_xname); 445 error = ENOBUFS; 446 } 447 splimp(); 448 sc->sc_flags &= ~SC_DECOMP_RUN; 449 splx(s); 450 } 451 return (error); 452 } 453 if (sc->sc_flags & SC_DEBUG) 454 printf("%s: no compressor for [%x %x %x], %x\n", 455 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 456 ccp_option[2], nb); 457 return (EINVAL); /* no handler found */ 458 #endif /* PPP_COMPRESS */ 459 460 case PPPIOCGNPMODE: 461 case PPPIOCSNPMODE: 462 npi = (struct npioctl *) data; 463 switch (npi->protocol) { 464 case PPP_IP: 465 npx = NP_IP; 466 break; 467 default: 468 return EINVAL; 469 } 470 if (cmd == PPPIOCGNPMODE) { 471 npi->mode = sc->sc_npmode[npx]; 472 } else { 473 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 474 return (error); 475 if (npi->mode != sc->sc_npmode[npx]) { 476 s = splsoftnet(); 477 sc->sc_npmode[npx] = npi->mode; 478 if (npi->mode != NPMODE_QUEUE) { 479 ppp_requeue(sc); 480 (*sc->sc_start)(sc); 481 } 482 splx(s); 483 } 484 } 485 break; 486 487 case PPPIOCGIDLE: 488 s = splsoftnet(); 489 t = time.tv_sec; 490 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 491 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 492 splx(s); 493 break; 494 495 case PPPIOCSPASS: 496 case PPPIOCSACTIVE: 497 nbp = (struct bpf_program *) data; 498 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 499 return EINVAL; 500 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 501 if (newcodelen != 0) { 502 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 503 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 504 newcodelen)) != 0) { 505 FREE(newcode, M_DEVBUF); 506 return error; 507 } 508 if (!bpf_validate(newcode, nbp->bf_len)) { 509 FREE(newcode, M_DEVBUF); 510 return EINVAL; 511 } 512 } else 513 newcode = 0; 514 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 515 oldcode = bp->bf_insns; 516 s = splimp(); 517 bp->bf_len = nbp->bf_len; 518 bp->bf_insns = newcode; 519 splx(s); 520 if (oldcode != 0) 521 FREE(oldcode, M_DEVBUF); 522 break; 523 524 default: 525 return (-1); 526 } 527 return (0); 528 } 529 530 /* 531 * Process an ioctl request to the ppp network interface. 532 */ 533 static int 534 pppsioctl(ifp, cmd, data) 535 register struct ifnet *ifp; 536 u_long cmd; 537 caddr_t data; 538 { 539 register struct ppp_softc *sc = ifp->if_softc; 540 register struct ifaddr *ifa = (struct ifaddr *)data; 541 register struct ifreq *ifr = (struct ifreq *)data; 542 struct ppp_stats *psp; 543 #ifdef PPP_COMPRESS 544 struct ppp_comp_stats *pcp; 545 #endif 546 int s = splimp(), error = 0; 547 548 switch (cmd) { 549 case SIOCSIFFLAGS: 550 if ((ifp->if_flags & IFF_RUNNING) == 0) 551 ifp->if_flags &= ~IFF_UP; 552 break; 553 554 case SIOCSIFADDR: 555 if (ifa->ifa_addr->sa_family != AF_INET) 556 error = EAFNOSUPPORT; 557 break; 558 559 case SIOCSIFDSTADDR: 560 if (ifa->ifa_addr->sa_family != AF_INET) 561 error = EAFNOSUPPORT; 562 break; 563 564 case SIOCSIFMTU: 565 sc->sc_if.if_mtu = ifr->ifr_mtu; 566 break; 567 568 case SIOCADDMULTI: 569 case SIOCDELMULTI: 570 if (ifr == 0) { 571 error = EAFNOSUPPORT; 572 break; 573 } 574 switch(ifr->ifr_addr.sa_family) { 575 #ifdef INET 576 case AF_INET: 577 break; 578 #endif 579 default: 580 error = EAFNOSUPPORT; 581 break; 582 } 583 break; 584 585 case SIOCGPPPSTATS: 586 psp = &((struct ifpppstatsreq *) data)->stats; 587 bzero(psp, sizeof(*psp)); 588 psp->p = sc->sc_stats; 589 #if defined(VJC) && !defined(SL_NO_STATS) 590 if (sc->sc_comp) { 591 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 592 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 593 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 594 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 595 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 596 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 597 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 598 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 599 } 600 #endif /* VJC */ 601 break; 602 603 #ifdef PPP_COMPRESS 604 case SIOCGPPPCSTATS: 605 pcp = &((struct ifpppcstatsreq *) data)->stats; 606 bzero(pcp, sizeof(*pcp)); 607 if (sc->sc_xc_state != NULL) 608 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 609 if (sc->sc_rc_state != NULL) 610 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 611 break; 612 #endif /* PPP_COMPRESS */ 613 614 default: 615 error = EINVAL; 616 } 617 splx(s); 618 return (error); 619 } 620 621 /* 622 * Queue a packet. Start transmission if not active. 623 * Packet is placed in Information field of PPP frame. 624 */ 625 int 626 pppoutput(ifp, m0, dst, rtp) 627 struct ifnet *ifp; 628 struct mbuf *m0; 629 struct sockaddr *dst; 630 struct rtentry *rtp; 631 { 632 register struct ppp_softc *sc = ifp->if_softc; 633 int protocol, address, control; 634 u_char *cp; 635 int s, error; 636 struct ip *ip; 637 struct ifqueue *ifq; 638 enum NPmode mode; 639 int len; 640 struct mbuf *m; 641 ALTQ_DECL(struct altq_pktattr pktattr;) 642 643 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 644 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 645 error = ENETDOWN; /* sort of */ 646 goto bad; 647 } 648 649 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 650 651 /* 652 * Compute PPP header. 653 */ 654 m0->m_flags &= ~M_HIGHPRI; 655 switch (dst->sa_family) { 656 #ifdef INET 657 case AF_INET: 658 address = PPP_ALLSTATIONS; 659 control = PPP_UI; 660 protocol = PPP_IP; 661 mode = sc->sc_npmode[NP_IP]; 662 663 /* 664 * If this packet has the "low delay" bit set in the IP header, 665 * put it on the fastq instead. 666 */ 667 ip = mtod(m0, struct ip *); 668 if (ip->ip_tos & IPTOS_LOWDELAY) 669 m0->m_flags |= M_HIGHPRI; 670 break; 671 #endif 672 case AF_UNSPEC: 673 address = PPP_ADDRESS(dst->sa_data); 674 control = PPP_CONTROL(dst->sa_data); 675 protocol = PPP_PROTOCOL(dst->sa_data); 676 mode = NPMODE_PASS; 677 break; 678 default: 679 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 680 error = EAFNOSUPPORT; 681 goto bad; 682 } 683 684 /* 685 * Drop this packet, or return an error, if necessary. 686 */ 687 if (mode == NPMODE_ERROR) { 688 error = ENETDOWN; 689 goto bad; 690 } 691 if (mode == NPMODE_DROP) { 692 error = 0; 693 goto bad; 694 } 695 696 /* 697 * Add PPP header. If no space in first mbuf, allocate another. 698 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 699 */ 700 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 701 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 702 if (m0 == 0) { 703 error = ENOBUFS; 704 goto bad; 705 } 706 m0->m_len = 0; 707 } else 708 m0->m_data -= PPP_HDRLEN; 709 710 cp = mtod(m0, u_char *); 711 *cp++ = address; 712 *cp++ = control; 713 *cp++ = protocol >> 8; 714 *cp++ = protocol & 0xff; 715 m0->m_len += PPP_HDRLEN; 716 717 len = 0; 718 for (m = m0; m != 0; m = m->m_next) 719 len += m->m_len; 720 721 if (sc->sc_flags & SC_LOG_OUTPKT) { 722 printf("%s output: ", ifp->if_xname); 723 pppdumpm(m0); 724 } 725 726 if ((protocol & 0x8000) == 0) { 727 /* 728 * Apply the pass and active filters to the packet, 729 * but only if it is a data packet. 730 */ 731 *mtod(m0, u_char *) = 1; /* indicates outbound */ 732 if (sc->sc_pass_filt.bf_insns != 0 733 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 734 len, 0) == 0) { 735 error = 0; /* drop this packet */ 736 goto bad; 737 } 738 739 /* 740 * Update the time we sent the most recent packet. 741 */ 742 if (sc->sc_active_filt.bf_insns == 0 743 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 744 sc->sc_last_sent = time.tv_sec; 745 746 *mtod(m0, u_char *) = address; 747 } 748 749 #if NBPFILTER > 0 750 /* 751 * See if bpf wants to look at the packet. 752 */ 753 if (sc->sc_bpf) 754 bpf_mtap(sc->sc_bpf, m0); 755 #endif 756 757 /* 758 * Put the packet on the appropriate queue. 759 */ 760 s = splsoftnet(); 761 if (mode == NPMODE_QUEUE) { 762 /* XXX we should limit the number of packets on this queue */ 763 *sc->sc_npqtail = m0; 764 m0->m_nextpkt = NULL; 765 sc->sc_npqtail = &m0->m_nextpkt; 766 } else { 767 if ((m0->m_flags & M_HIGHPRI) 768 #ifdef ALTQ 769 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 770 #endif 771 ) { 772 ifq = &sc->sc_fastq; 773 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 774 IF_DROP(ifq); 775 m_freem(m0); 776 error = ENOBUFS; 777 } 778 else { 779 IF_ENQUEUE(ifq, m0); 780 error = 0; 781 } 782 } else 783 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 784 if (error) { 785 splx(s); 786 sc->sc_if.if_oerrors++; 787 sc->sc_stats.ppp_oerrors++; 788 return (error); 789 } 790 (*sc->sc_start)(sc); 791 } 792 ifp->if_opackets++; 793 ifp->if_obytes += len; 794 795 splx(s); 796 return (0); 797 798 bad: 799 m_freem(m0); 800 return (error); 801 } 802 803 /* 804 * After a change in the NPmode for some NP, move packets from the 805 * npqueue to the send queue or the fast queue as appropriate. 806 * Should be called at splsoftnet. 807 */ 808 static void 809 ppp_requeue(sc) 810 struct ppp_softc *sc; 811 { 812 struct mbuf *m, **mpp; 813 struct ifqueue *ifq; 814 enum NPmode mode; 815 int error; 816 817 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 818 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 819 case PPP_IP: 820 mode = sc->sc_npmode[NP_IP]; 821 break; 822 default: 823 mode = NPMODE_PASS; 824 } 825 826 switch (mode) { 827 case NPMODE_PASS: 828 /* 829 * This packet can now go on one of the queues to be sent. 830 */ 831 *mpp = m->m_nextpkt; 832 m->m_nextpkt = NULL; 833 if ((m->m_flags & M_HIGHPRI) 834 #ifdef ALTQ 835 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 836 #endif 837 ) { 838 ifq = &sc->sc_fastq; 839 if (IF_QFULL(ifq)) { 840 IF_DROP(ifq); 841 m_freem(m); 842 error = ENOBUFS; 843 } 844 else { 845 IF_ENQUEUE(ifq, m); 846 error = 0; 847 } 848 } else 849 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 850 if (error) { 851 sc->sc_if.if_oerrors++; 852 sc->sc_stats.ppp_oerrors++; 853 } 854 break; 855 856 case NPMODE_DROP: 857 case NPMODE_ERROR: 858 *mpp = m->m_nextpkt; 859 m_freem(m); 860 break; 861 862 case NPMODE_QUEUE: 863 mpp = &m->m_nextpkt; 864 break; 865 } 866 } 867 sc->sc_npqtail = mpp; 868 } 869 870 /* 871 * Transmitter has finished outputting some stuff; 872 * remember to call sc->sc_start later at splsoftnet. 873 */ 874 void 875 ppp_restart(sc) 876 struct ppp_softc *sc; 877 { 878 int s = splimp(); 879 880 sc->sc_flags &= ~SC_TBUSY; 881 schednetisr(NETISR_PPP); 882 splx(s); 883 } 884 885 /* 886 * Get a packet to send. This procedure is intended to be called at 887 * splsoftnet, since it may involve time-consuming operations such as 888 * applying VJ compression, packet compression, address/control and/or 889 * protocol field compression to the packet. 890 */ 891 struct mbuf * 892 ppp_dequeue(sc) 893 struct ppp_softc *sc; 894 { 895 struct mbuf *m, *mp; 896 u_char *cp; 897 int address, control, protocol; 898 899 /* 900 * Grab a packet to send: first try the fast queue, then the 901 * normal queue. 902 */ 903 IF_DEQUEUE(&sc->sc_fastq, m); 904 if (m == NULL) 905 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 906 if (m == NULL) 907 return NULL; 908 909 ++sc->sc_stats.ppp_opackets; 910 911 /* 912 * Extract the ppp header of the new packet. 913 * The ppp header will be in one mbuf. 914 */ 915 cp = mtod(m, u_char *); 916 address = PPP_ADDRESS(cp); 917 control = PPP_CONTROL(cp); 918 protocol = PPP_PROTOCOL(cp); 919 920 switch (protocol) { 921 case PPP_IP: 922 #ifdef VJC 923 /* 924 * If the packet is a TCP/IP packet, see if we can compress it. 925 */ 926 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 927 struct ip *ip; 928 int type; 929 930 mp = m; 931 ip = (struct ip *) (cp + PPP_HDRLEN); 932 if (mp->m_len <= PPP_HDRLEN) { 933 mp = mp->m_next; 934 if (mp == NULL) 935 break; 936 ip = mtod(mp, struct ip *); 937 } 938 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 939 if (ip->ip_p == IPPROTO_TCP) { 940 type = sl_compress_tcp(mp, ip, sc->sc_comp, 941 !(sc->sc_flags & SC_NO_TCP_CCID)); 942 switch (type) { 943 case TYPE_UNCOMPRESSED_TCP: 944 protocol = PPP_VJC_UNCOMP; 945 break; 946 case TYPE_COMPRESSED_TCP: 947 protocol = PPP_VJC_COMP; 948 cp = mtod(m, u_char *); 949 cp[0] = address; /* header has moved */ 950 cp[1] = control; 951 cp[2] = 0; 952 break; 953 } 954 cp[3] = protocol; /* update protocol in PPP header */ 955 } 956 } 957 #endif /* VJC */ 958 break; 959 960 #ifdef PPP_COMPRESS 961 case PPP_CCP: 962 ppp_ccp(sc, m, 0); 963 break; 964 #endif /* PPP_COMPRESS */ 965 } 966 967 #ifdef PPP_COMPRESS 968 if (protocol != PPP_LCP && protocol != PPP_CCP 969 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 970 struct mbuf *mcomp = NULL; 971 int slen, clen; 972 973 slen = 0; 974 for (mp = m; mp != NULL; mp = mp->m_next) 975 slen += mp->m_len; 976 clen = (*sc->sc_xcomp->compress) 977 (sc->sc_xc_state, &mcomp, m, slen, 978 (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); 979 if (mcomp != NULL) { 980 if (sc->sc_flags & SC_CCP_UP) { 981 /* Send the compressed packet instead of the original. */ 982 m_freem(m); 983 m = mcomp; 984 cp = mtod(m, u_char *); 985 protocol = cp[3]; 986 } else { 987 /* Can't transmit compressed packets until CCP is up. */ 988 m_freem(mcomp); 989 } 990 } 991 } 992 #endif /* PPP_COMPRESS */ 993 994 /* 995 * Compress the address/control and protocol, if possible. 996 */ 997 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 998 control == PPP_UI && protocol != PPP_ALLSTATIONS && 999 protocol != PPP_LCP) { 1000 /* can compress address/control */ 1001 m->m_data += 2; 1002 m->m_len -= 2; 1003 } 1004 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1005 /* can compress protocol */ 1006 if (mtod(m, u_char *) == cp) { 1007 cp[2] = cp[1]; /* move address/control up */ 1008 cp[1] = cp[0]; 1009 } 1010 ++m->m_data; 1011 --m->m_len; 1012 } 1013 1014 return m; 1015 } 1016 1017 /* 1018 * Software interrupt routine, called at splsoftnet. 1019 */ 1020 void 1021 pppintr() 1022 { 1023 struct ppp_softc *sc; 1024 int i, s, s2; 1025 struct mbuf *m; 1026 1027 sc = ppp_softc; 1028 s = splsoftnet(); 1029 for (i = 0; i < NPPP; ++i, ++sc) { 1030 if (!(sc->sc_flags & SC_TBUSY) 1031 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head)) { 1032 s2 = splimp(); 1033 sc->sc_flags |= SC_TBUSY; 1034 splx(s2); 1035 (*sc->sc_start)(sc); 1036 } 1037 for (;;) { 1038 s2 = splimp(); 1039 IF_DEQUEUE(&sc->sc_rawq, m); 1040 splx(s2); 1041 if (m == NULL) 1042 break; 1043 ppp_inproc(sc, m); 1044 } 1045 } 1046 splx(s); 1047 } 1048 1049 #ifdef PPP_COMPRESS 1050 /* 1051 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1052 * 0 if it is about to be transmitted. 1053 */ 1054 static void 1055 ppp_ccp(sc, m, rcvd) 1056 struct ppp_softc *sc; 1057 struct mbuf *m; 1058 int rcvd; 1059 { 1060 u_char *dp, *ep; 1061 struct mbuf *mp; 1062 int slen, s; 1063 1064 /* 1065 * Get a pointer to the data after the PPP header. 1066 */ 1067 if (m->m_len <= PPP_HDRLEN) { 1068 mp = m->m_next; 1069 if (mp == NULL) 1070 return; 1071 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1072 } else { 1073 mp = m; 1074 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1075 } 1076 1077 ep = mtod(mp, u_char *) + mp->m_len; 1078 if (dp + CCP_HDRLEN > ep) 1079 return; 1080 slen = CCP_LENGTH(dp); 1081 if (dp + slen > ep) { 1082 if (sc->sc_flags & SC_DEBUG) 1083 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1084 dp, slen, mtod(mp, u_char *), mp->m_len); 1085 return; 1086 } 1087 1088 switch (CCP_CODE(dp)) { 1089 case CCP_CONFREQ: 1090 case CCP_TERMREQ: 1091 case CCP_TERMACK: 1092 /* CCP must be going down - disable compression */ 1093 if (sc->sc_flags & SC_CCP_UP) { 1094 s = splimp(); 1095 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1096 splx(s); 1097 } 1098 break; 1099 1100 case CCP_CONFACK: 1101 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1102 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1103 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1104 if (!rcvd) { 1105 /* we're agreeing to send compressed packets. */ 1106 if (sc->sc_xc_state != NULL 1107 && (*sc->sc_xcomp->comp_init) 1108 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1109 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1110 s = splimp(); 1111 sc->sc_flags |= SC_COMP_RUN; 1112 splx(s); 1113 } 1114 } else { 1115 /* peer is agreeing to send compressed packets. */ 1116 if (sc->sc_rc_state != NULL 1117 && (*sc->sc_rcomp->decomp_init) 1118 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1119 sc->sc_unit, 0, sc->sc_mru, 1120 sc->sc_flags & SC_DEBUG)) { 1121 s = splimp(); 1122 sc->sc_flags |= SC_DECOMP_RUN; 1123 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1124 splx(s); 1125 } 1126 } 1127 } 1128 break; 1129 1130 case CCP_RESETACK: 1131 if (sc->sc_flags & SC_CCP_UP) { 1132 if (!rcvd) { 1133 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1134 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1135 } else { 1136 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1137 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1138 s = splimp(); 1139 sc->sc_flags &= ~SC_DC_ERROR; 1140 splx(s); 1141 } 1142 } 1143 } 1144 break; 1145 } 1146 } 1147 1148 /* 1149 * CCP is down; free (de)compressor state if necessary. 1150 */ 1151 static void 1152 ppp_ccp_closed(sc) 1153 struct ppp_softc *sc; 1154 { 1155 if (sc->sc_xc_state) { 1156 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1157 sc->sc_xc_state = NULL; 1158 } 1159 if (sc->sc_rc_state) { 1160 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1161 sc->sc_rc_state = NULL; 1162 } 1163 } 1164 #endif /* PPP_COMPRESS */ 1165 1166 /* 1167 * PPP packet input routine. 1168 * The caller has checked and removed the FCS and has inserted 1169 * the address/control bytes and the protocol high byte if they 1170 * were omitted. 1171 */ 1172 void 1173 ppppktin(sc, m, lost) 1174 struct ppp_softc *sc; 1175 struct mbuf *m; 1176 int lost; 1177 { 1178 int s = splimp(); 1179 1180 if (lost) 1181 m->m_flags |= M_ERRMARK; 1182 IF_ENQUEUE(&sc->sc_rawq, m); 1183 schednetisr(NETISR_PPP); 1184 splx(s); 1185 } 1186 1187 /* 1188 * Process a received PPP packet, doing decompression as necessary. 1189 * Should be called at splsoftnet. 1190 */ 1191 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1192 TYPE_UNCOMPRESSED_TCP) 1193 1194 static void 1195 ppp_inproc(sc, m) 1196 struct ppp_softc *sc; 1197 struct mbuf *m; 1198 { 1199 struct ifnet *ifp = &sc->sc_if; 1200 struct ifqueue *inq; 1201 int s, ilen, xlen, proto, rv; 1202 u_char *cp, adrs, ctrl; 1203 struct mbuf *mp, *dmp = NULL; 1204 u_char *iphdr; 1205 u_int hlen; 1206 1207 sc->sc_stats.ppp_ipackets++; 1208 1209 if (sc->sc_flags & SC_LOG_INPKT) { 1210 ilen = 0; 1211 for (mp = m; mp != NULL; mp = mp->m_next) 1212 ilen += mp->m_len; 1213 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1214 pppdumpm(m); 1215 } 1216 1217 cp = mtod(m, u_char *); 1218 adrs = PPP_ADDRESS(cp); 1219 ctrl = PPP_CONTROL(cp); 1220 proto = PPP_PROTOCOL(cp); 1221 1222 if (m->m_flags & M_ERRMARK) { 1223 m->m_flags &= ~M_ERRMARK; 1224 s = splimp(); 1225 sc->sc_flags |= SC_VJ_RESET; 1226 splx(s); 1227 } 1228 1229 #ifdef PPP_COMPRESS 1230 /* 1231 * Decompress this packet if necessary, update the receiver's 1232 * dictionary, or take appropriate action on a CCP packet. 1233 */ 1234 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1235 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1236 /* decompress this packet */ 1237 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1238 if (rv == DECOMP_OK) { 1239 m_freem(m); 1240 if (dmp == NULL) { 1241 /* no error, but no decompressed packet produced */ 1242 return; 1243 } 1244 m = dmp; 1245 cp = mtod(m, u_char *); 1246 proto = PPP_PROTOCOL(cp); 1247 1248 } else { 1249 /* 1250 * An error has occurred in decompression. 1251 * Pass the compressed packet up to pppd, which may take 1252 * CCP down or issue a Reset-Req. 1253 */ 1254 if (sc->sc_flags & SC_DEBUG) 1255 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1256 s = splimp(); 1257 sc->sc_flags |= SC_VJ_RESET; 1258 if (rv == DECOMP_ERROR) 1259 sc->sc_flags |= SC_DC_ERROR; 1260 else 1261 sc->sc_flags |= SC_DC_FERROR; 1262 splx(s); 1263 } 1264 1265 } else { 1266 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1267 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1268 } 1269 if (proto == PPP_CCP) { 1270 ppp_ccp(sc, m, 1); 1271 } 1272 } 1273 #endif 1274 1275 ilen = 0; 1276 for (mp = m; mp != NULL; mp = mp->m_next) 1277 ilen += mp->m_len; 1278 1279 #ifdef VJC 1280 if (sc->sc_flags & SC_VJ_RESET) { 1281 /* 1282 * If we've missed a packet, we must toss subsequent compressed 1283 * packets which don't have an explicit connection ID. 1284 */ 1285 if (sc->sc_comp) 1286 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1287 s = splimp(); 1288 sc->sc_flags &= ~SC_VJ_RESET; 1289 splx(s); 1290 } 1291 1292 /* 1293 * See if we have a VJ-compressed packet to uncompress. 1294 */ 1295 if (proto == PPP_VJC_COMP) { 1296 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1297 goto bad; 1298 1299 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1300 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1301 sc->sc_comp, &iphdr, &hlen); 1302 1303 if (xlen <= 0) { 1304 if (sc->sc_flags & SC_DEBUG) 1305 printf("%s: VJ uncompress failed on type comp\n", 1306 ifp->if_xname); 1307 goto bad; 1308 } 1309 1310 /* Copy the PPP and IP headers into a new mbuf. */ 1311 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1312 if (mp == NULL) 1313 goto bad; 1314 mp->m_len = 0; 1315 mp->m_next = NULL; 1316 if (hlen + PPP_HDRLEN > MHLEN) { 1317 MCLGET(mp, M_DONTWAIT); 1318 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1319 m_freem(mp); 1320 goto bad; /* lose if big headers and no clusters */ 1321 } 1322 } 1323 if (m->m_flags & M_PKTHDR) 1324 M_MOVE_HDR(mp, m); 1325 cp = mtod(mp, u_char *); 1326 cp[0] = adrs; 1327 cp[1] = ctrl; 1328 cp[2] = 0; 1329 cp[3] = PPP_IP; 1330 proto = PPP_IP; 1331 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1332 mp->m_len = hlen + PPP_HDRLEN; 1333 1334 /* 1335 * Trim the PPP and VJ headers off the old mbuf 1336 * and stick the new and old mbufs together. 1337 */ 1338 m->m_data += PPP_HDRLEN + xlen; 1339 m->m_len -= PPP_HDRLEN + xlen; 1340 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1341 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1342 mp->m_len += m->m_len; 1343 MFREE(m, mp->m_next); 1344 } else 1345 mp->m_next = m; 1346 m = mp; 1347 ilen += hlen - xlen; 1348 1349 } else if (proto == PPP_VJC_UNCOMP) { 1350 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1351 goto bad; 1352 1353 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1354 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1355 sc->sc_comp, &iphdr, &hlen); 1356 1357 if (xlen < 0) { 1358 if (sc->sc_flags & SC_DEBUG) 1359 printf("%s: VJ uncompress failed on type uncomp\n", 1360 ifp->if_xname); 1361 goto bad; 1362 } 1363 1364 proto = PPP_IP; 1365 cp[3] = PPP_IP; 1366 } 1367 #endif /* VJC */ 1368 1369 /* 1370 * If the packet will fit in a header mbuf, don't waste a 1371 * whole cluster on it. 1372 */ 1373 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1374 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1375 if (mp != NULL) { 1376 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1377 m_freem(m); 1378 m = mp; 1379 m->m_len = ilen; 1380 } 1381 } 1382 m->m_pkthdr.len = ilen; 1383 m->m_pkthdr.rcvif = ifp; 1384 1385 if ((proto & 0x8000) == 0) { 1386 /* 1387 * See whether we want to pass this packet, and 1388 * if it counts as link activity. 1389 */ 1390 adrs = *mtod(m, u_char *); /* save address field */ 1391 *mtod(m, u_char *) = 0; /* indicate inbound */ 1392 if (sc->sc_pass_filt.bf_insns != 0 1393 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1394 ilen, 0) == 0) { 1395 /* drop this packet */ 1396 m_freem(m); 1397 return; 1398 } 1399 if (sc->sc_active_filt.bf_insns == 0 1400 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1401 sc->sc_last_recv = time.tv_sec; 1402 1403 *mtod(m, u_char *) = adrs; 1404 } 1405 1406 #if NBPFILTER > 0 1407 /* See if bpf wants to look at the packet. */ 1408 if (sc->sc_bpf) 1409 bpf_mtap(sc->sc_bpf, m); 1410 #endif 1411 1412 rv = 0; 1413 switch (proto) { 1414 #ifdef INET 1415 case PPP_IP: 1416 /* 1417 * IP packet - take off the ppp header and pass it up to IP. 1418 */ 1419 if ((ifp->if_flags & IFF_UP) == 0 1420 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1421 /* interface is down - drop the packet. */ 1422 m_freem(m); 1423 return; 1424 } 1425 m->m_pkthdr.len -= PPP_HDRLEN; 1426 m->m_data += PPP_HDRLEN; 1427 m->m_len -= PPP_HDRLEN; 1428 schednetisr(NETISR_IP); 1429 inq = &ipintrq; 1430 break; 1431 #endif 1432 1433 default: 1434 /* 1435 * Some other protocol - place on input queue for read(). 1436 */ 1437 inq = &sc->sc_inq; 1438 rv = 1; 1439 break; 1440 } 1441 1442 /* 1443 * Put the packet on the appropriate input queue. 1444 */ 1445 s = splimp(); 1446 if (IF_QFULL(inq)) { 1447 IF_DROP(inq); 1448 splx(s); 1449 if (sc->sc_flags & SC_DEBUG) 1450 printf("%s: input queue full\n", ifp->if_xname); 1451 ifp->if_iqdrops++; 1452 goto bad; 1453 } 1454 IF_ENQUEUE(inq, m); 1455 splx(s); 1456 ifp->if_ipackets++; 1457 ifp->if_ibytes += ilen; 1458 1459 if (rv) 1460 (*sc->sc_ctlp)(sc); 1461 1462 return; 1463 1464 bad: 1465 m_freem(m); 1466 sc->sc_if.if_ierrors++; 1467 sc->sc_stats.ppp_ierrors++; 1468 } 1469 1470 #define MAX_DUMP_BYTES 128 1471 1472 static void 1473 pppdumpm(m0) 1474 struct mbuf *m0; 1475 { 1476 char buf[3*MAX_DUMP_BYTES+4]; 1477 char *bp = buf; 1478 struct mbuf *m; 1479 static char digits[] = "0123456789abcdef"; 1480 1481 for (m = m0; m; m = m->m_next) { 1482 int l = m->m_len; 1483 u_char *rptr = (u_char *)m->m_data; 1484 1485 while (l--) { 1486 if (bp > buf + sizeof(buf) - 4) 1487 goto done; 1488 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1489 *bp++ = digits[*rptr++ & 0xf]; 1490 } 1491 1492 if (m->m_next) { 1493 if (bp > buf + sizeof(buf) - 3) 1494 goto done; 1495 *bp++ = '|'; 1496 } else 1497 *bp++ = ' '; 1498 } 1499 done: 1500 if (m) 1501 *bp++ = '>'; 1502 *bp = 0; 1503 printf("%s\n", buf); 1504 } 1505 1506 #endif /* NPPP > 0 */ 1507