if_ppp.c revision 1.47
1 /* $NetBSD: if_ppp.c,v 1.47 1998/09/03 14:12:36 christos Exp $ */ 2 /* Id: if_ppp.c,v 1.6 1997/03/04 03:33:00 paulus 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 (at) 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 (at) seismo.ARPA 55 * seismo!rick 56 * 57 * Pounded on heavily by Chris Torek (chris (at) 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 (at) cayman.com) 62 * Added VJ tcp header compression; more unified ioctls 63 * 64 * Extensively modified by Paul Mackerras (paulus (at) 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 (at) 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 "opt_inet.h" 85 #include "opt_gateway.h" 86 87 #include <sys/param.h> 88 #include <sys/proc.h> 89 #include <sys/mbuf.h> 90 #include <sys/socket.h> 91 #include <sys/ioctl.h> 92 #include <sys/kernel.h> 93 #include <sys/systm.h> 94 #include <sys/time.h> 95 #include <sys/malloc.h> 96 97 #include <net/if.h> 98 #include <net/if_types.h> 99 #include <net/netisr.h> 100 #include <net/route.h> 101 #ifdef PPP_FILTER 102 #include <net/bpf.h> 103 #endif 104 105 #ifdef INET 106 #include <netinet/in.h> 107 #include <netinet/in_systm.h> 108 #include <netinet/in_var.h> 109 #include <netinet/ip.h> 110 #endif 111 112 #include "bpfilter.h" 113 #if NBPFILTER > 0 114 #include <sys/time.h> 115 #include <net/bpf.h> 116 #endif 117 118 #if defined(PPP_FILTER) || NBPFILTER > 0 119 #include <net/slip.h> 120 #endif 121 122 #ifdef VJC 123 #include <net/slcompress.h> 124 #endif 125 126 #include <net/ppp_defs.h> 127 #include <net/if_ppp.h> 128 #include <net/if_pppvar.h> 129 #include <machine/cpu.h> 130 131 #ifdef PPP_COMPRESS 132 #define PACKETPTR struct mbuf * 133 #include <net/ppp-comp.h> 134 #endif 135 136 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 137 static void ppp_requeue __P((struct ppp_softc *)); 138 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 139 static void ppp_ccp_closed __P((struct ppp_softc *)); 140 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 141 static void pppdumpm __P((struct mbuf *m0)); 142 143 /* 144 * Some useful mbuf macros not in mbuf.h. 145 */ 146 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 147 148 #define M_DATASTART(m) \ 149 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 150 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 151 152 #define M_DATASIZE(m) \ 153 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 154 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 155 156 /* 157 * We steal two bits in the mbuf m_flags, to mark high-priority packets 158 * for output, and received packets following lost/corrupted packets. 159 */ 160 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 161 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 162 163 164 #ifdef PPP_COMPRESS 165 /* 166 * List of compressors we know about. 167 * We leave some space so maybe we can modload compressors. 168 */ 169 170 extern struct compressor ppp_bsd_compress; 171 extern struct compressor ppp_deflate, ppp_deflate_draft; 172 173 struct compressor *ppp_compressors[8] = { 174 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 175 &ppp_bsd_compress, 176 #endif 177 #if DO_DEFLATE && defined(PPP_DEFLATE) 178 &ppp_deflate, 179 &ppp_deflate_draft, 180 #endif 181 NULL 182 }; 183 #endif /* PPP_COMPRESS */ 184 185 186 /* 187 * Called from boot code to establish ppp interfaces. 188 */ 189 void 190 pppattach() 191 { 192 register struct ppp_softc *sc; 193 register int i = 0; 194 195 for (sc = ppp_softc; i < NPPP; sc++) { 196 sc->sc_unit = i; /* XXX */ 197 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 198 sc->sc_if.if_softc = sc; 199 sc->sc_if.if_mtu = PPP_MTU; 200 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 201 sc->sc_if.if_type = IFT_PPP; 202 sc->sc_if.if_hdrlen = PPP_HDRLEN; 203 sc->sc_if.if_ioctl = pppsioctl; 204 sc->sc_if.if_output = pppoutput; 205 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 206 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 207 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 208 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 209 if_attach(&sc->sc_if); 210 #if NBPFILTER > 0 211 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 212 #endif 213 } 214 } 215 216 /* 217 * Allocate a ppp interface unit and initialize it. 218 */ 219 struct ppp_softc * 220 pppalloc(pid) 221 pid_t pid; 222 { 223 int nppp, i; 224 struct ppp_softc *sc; 225 226 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 227 if (sc->sc_xfer == pid) { 228 sc->sc_xfer = 0; 229 return sc; 230 } 231 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 232 if (sc->sc_devp == NULL) 233 break; 234 if (nppp >= NPPP) 235 return NULL; 236 237 sc->sc_flags = 0; 238 sc->sc_mru = PPP_MRU; 239 sc->sc_relinq = NULL; 240 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 241 #ifdef VJC 242 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 243 M_DEVBUF, M_NOWAIT); 244 if (sc->sc_comp) 245 sl_compress_init(sc->sc_comp); 246 #endif 247 #ifdef PPP_COMPRESS 248 sc->sc_xc_state = NULL; 249 sc->sc_rc_state = NULL; 250 #endif /* PPP_COMPRESS */ 251 for (i = 0; i < NUM_NP; ++i) 252 sc->sc_npmode[i] = NPMODE_ERROR; 253 sc->sc_npqueue = NULL; 254 sc->sc_npqtail = &sc->sc_npqueue; 255 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 256 257 return sc; 258 } 259 260 /* 261 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 262 */ 263 void 264 pppdealloc(sc) 265 struct ppp_softc *sc; 266 { 267 struct mbuf *m; 268 269 if_down(&sc->sc_if); 270 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 271 sc->sc_devp = NULL; 272 sc->sc_xfer = 0; 273 for (;;) { 274 IF_DEQUEUE(&sc->sc_rawq, m); 275 if (m == NULL) 276 break; 277 m_freem(m); 278 } 279 for (;;) { 280 IF_DEQUEUE(&sc->sc_inq, m); 281 if (m == NULL) 282 break; 283 m_freem(m); 284 } 285 for (;;) { 286 IF_DEQUEUE(&sc->sc_fastq, m); 287 if (m == NULL) 288 break; 289 m_freem(m); 290 } 291 while ((m = sc->sc_npqueue) != NULL) { 292 sc->sc_npqueue = m->m_nextpkt; 293 m_freem(m); 294 } 295 if (sc->sc_togo != NULL) { 296 m_freem(sc->sc_togo); 297 sc->sc_togo = NULL; 298 } 299 #ifdef PPP_COMPRESS 300 ppp_ccp_closed(sc); 301 sc->sc_xc_state = NULL; 302 sc->sc_rc_state = NULL; 303 #endif /* PPP_COMPRESS */ 304 #ifdef PPP_FILTER 305 if (sc->sc_pass_filt.bf_insns != 0) { 306 FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); 307 sc->sc_pass_filt.bf_insns = 0; 308 sc->sc_pass_filt.bf_len = 0; 309 } 310 if (sc->sc_active_filt.bf_insns != 0) { 311 FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); 312 sc->sc_active_filt.bf_insns = 0; 313 sc->sc_active_filt.bf_len = 0; 314 } 315 #endif /* PPP_FILTER */ 316 #ifdef VJC 317 if (sc->sc_comp != 0) { 318 FREE(sc->sc_comp, M_DEVBUF); 319 sc->sc_comp = 0; 320 } 321 #endif 322 } 323 324 /* 325 * Ioctl routine for generic ppp devices. 326 */ 327 int 328 pppioctl(sc, cmd, data, flag, p) 329 struct ppp_softc *sc; 330 u_long cmd; 331 caddr_t data; 332 int flag; 333 struct proc *p; 334 { 335 int s, error, flags, mru, nb, npx; 336 struct ppp_option_data *odp; 337 struct compressor **cp; 338 struct npioctl *npi; 339 time_t t; 340 #ifdef PPP_FILTER 341 struct bpf_program *bp, *nbp; 342 struct bpf_insn *newcode, *oldcode; 343 int newcodelen; 344 #endif /* PPP_FILTER */ 345 #ifdef PPP_COMPRESS 346 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 347 #endif 348 349 switch (cmd) { 350 case FIONREAD: 351 *(int *)data = sc->sc_inq.ifq_len; 352 break; 353 354 case PPPIOCGUNIT: 355 *(int *)data = sc->sc_unit; /* XXX */ 356 break; 357 358 case PPPIOCGFLAGS: 359 *(u_int *)data = sc->sc_flags; 360 break; 361 362 case PPPIOCSFLAGS: 363 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 364 return (error); 365 flags = *(int *)data & SC_MASK; 366 s = splsoftnet(); 367 #ifdef PPP_COMPRESS 368 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 369 ppp_ccp_closed(sc); 370 #endif 371 splimp(); 372 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 373 splx(s); 374 break; 375 376 case PPPIOCSMRU: 377 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 378 return (error); 379 mru = *(int *)data; 380 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 381 sc->sc_mru = mru; 382 break; 383 384 case PPPIOCGMRU: 385 *(int *)data = sc->sc_mru; 386 break; 387 388 #ifdef VJC 389 case PPPIOCSMAXCID: 390 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 391 return (error); 392 if (sc->sc_comp) { 393 s = splsoftnet(); 394 sl_compress_setup(sc->sc_comp, *(int *)data); 395 splx(s); 396 } 397 break; 398 #endif 399 400 case PPPIOCXFERUNIT: 401 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 402 return (error); 403 sc->sc_xfer = p->p_pid; 404 break; 405 406 #ifdef PPP_COMPRESS 407 case PPPIOCSCOMPRESS: 408 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 409 return (error); 410 odp = (struct ppp_option_data *) data; 411 nb = odp->length; 412 if (nb > sizeof(ccp_option)) 413 nb = sizeof(ccp_option); 414 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 415 return (error); 416 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 417 return (EINVAL); 418 for (cp = ppp_compressors; *cp != NULL; ++cp) 419 if ((*cp)->compress_proto == ccp_option[0]) { 420 /* 421 * Found a handler for the protocol - try to allocate 422 * a compressor or decompressor. 423 */ 424 error = 0; 425 if (odp->transmit) { 426 s = splsoftnet(); 427 if (sc->sc_xc_state != NULL) 428 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 429 sc->sc_xcomp = *cp; 430 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 431 if (sc->sc_xc_state == NULL) { 432 if (sc->sc_flags & SC_DEBUG) 433 printf("%s: comp_alloc failed\n", 434 sc->sc_if.if_xname); 435 error = ENOBUFS; 436 } 437 splimp(); 438 sc->sc_flags &= ~SC_COMP_RUN; 439 splx(s); 440 } else { 441 s = splsoftnet(); 442 if (sc->sc_rc_state != NULL) 443 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 444 sc->sc_rcomp = *cp; 445 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 446 if (sc->sc_rc_state == NULL) { 447 if (sc->sc_flags & SC_DEBUG) 448 printf("%s: decomp_alloc failed\n", 449 sc->sc_if.if_xname); 450 error = ENOBUFS; 451 } 452 splimp(); 453 sc->sc_flags &= ~SC_DECOMP_RUN; 454 splx(s); 455 } 456 return (error); 457 } 458 if (sc->sc_flags & SC_DEBUG) 459 printf("%s: no compressor for [%x %x %x], %x\n", 460 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 461 ccp_option[2], nb); 462 return (EINVAL); /* no handler found */ 463 #endif /* PPP_COMPRESS */ 464 465 case PPPIOCGNPMODE: 466 case PPPIOCSNPMODE: 467 npi = (struct npioctl *) data; 468 switch (npi->protocol) { 469 case PPP_IP: 470 npx = NP_IP; 471 break; 472 default: 473 return EINVAL; 474 } 475 if (cmd == PPPIOCGNPMODE) { 476 npi->mode = sc->sc_npmode[npx]; 477 } else { 478 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 479 return (error); 480 if (npi->mode != sc->sc_npmode[npx]) { 481 s = splimp(); 482 sc->sc_npmode[npx] = npi->mode; 483 if (npi->mode != NPMODE_QUEUE) { 484 ppp_requeue(sc); 485 ppp_restart(sc); 486 } 487 splx(s); 488 } 489 } 490 break; 491 492 case PPPIOCGIDLE: 493 s = splsoftnet(); 494 t = time.tv_sec; 495 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 496 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 497 splx(s); 498 break; 499 500 #ifdef PPP_FILTER 501 case PPPIOCSPASS: 502 case PPPIOCSACTIVE: 503 nbp = (struct bpf_program *) data; 504 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 505 return EINVAL; 506 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 507 if (newcodelen != 0) { 508 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 509 if (newcode == 0) { 510 return EINVAL; /* or sumpin */ 511 } 512 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 513 newcodelen)) != 0) { 514 FREE(newcode, M_DEVBUF); 515 return error; 516 } 517 if (!bpf_validate(newcode, nbp->bf_len)) { 518 FREE(newcode, M_DEVBUF); 519 return EINVAL; 520 } 521 } else 522 newcode = 0; 523 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 524 oldcode = bp->bf_insns; 525 s = splimp(); 526 bp->bf_len = nbp->bf_len; 527 bp->bf_insns = newcode; 528 splx(s); 529 if (oldcode != 0) 530 FREE(oldcode, M_DEVBUF); 531 break; 532 #endif 533 534 default: 535 return (-1); 536 } 537 return (0); 538 } 539 540 /* 541 * Process an ioctl request to the ppp network interface. 542 */ 543 static int 544 pppsioctl(ifp, cmd, data) 545 register struct ifnet *ifp; 546 u_long cmd; 547 caddr_t data; 548 { 549 register struct proc *p = curproc; /* XXX */ 550 register struct ppp_softc *sc = ifp->if_softc; 551 register struct ifaddr *ifa = (struct ifaddr *)data; 552 register struct ifreq *ifr = (struct ifreq *)data; 553 struct ppp_stats *psp; 554 #ifdef PPP_COMPRESS 555 struct ppp_comp_stats *pcp; 556 #endif 557 int s = splimp(), error = 0; 558 559 switch (cmd) { 560 case SIOCSIFFLAGS: 561 if ((ifp->if_flags & IFF_RUNNING) == 0) 562 ifp->if_flags &= ~IFF_UP; 563 break; 564 565 case SIOCSIFADDR: 566 if (ifa->ifa_addr->sa_family != AF_INET) 567 error = EAFNOSUPPORT; 568 break; 569 570 case SIOCSIFDSTADDR: 571 if (ifa->ifa_addr->sa_family != AF_INET) 572 error = EAFNOSUPPORT; 573 break; 574 575 case SIOCSIFMTU: 576 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 577 break; 578 sc->sc_if.if_mtu = ifr->ifr_mtu; 579 break; 580 581 case SIOCGIFMTU: 582 ifr->ifr_mtu = sc->sc_if.if_mtu; 583 break; 584 585 case SIOCADDMULTI: 586 case SIOCDELMULTI: 587 if (ifr == 0) { 588 error = EAFNOSUPPORT; 589 break; 590 } 591 switch(ifr->ifr_addr.sa_family) { 592 #ifdef INET 593 case AF_INET: 594 break; 595 #endif 596 default: 597 error = EAFNOSUPPORT; 598 break; 599 } 600 break; 601 602 case SIOCGPPPSTATS: 603 psp = &((struct ifpppstatsreq *) data)->stats; 604 bzero(psp, sizeof(*psp)); 605 psp->p = sc->sc_stats; 606 #if defined(VJC) && !defined(SL_NO_STATS) 607 if (sc->sc_comp) { 608 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 609 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 610 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 611 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 612 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 613 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 614 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 615 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 616 } 617 #endif /* VJC */ 618 break; 619 620 #ifdef PPP_COMPRESS 621 case SIOCGPPPCSTATS: 622 pcp = &((struct ifpppcstatsreq *) data)->stats; 623 bzero(pcp, sizeof(*pcp)); 624 if (sc->sc_xc_state != NULL) 625 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 626 if (sc->sc_rc_state != NULL) 627 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 628 break; 629 #endif /* PPP_COMPRESS */ 630 631 default: 632 error = EINVAL; 633 } 634 splx(s); 635 return (error); 636 } 637 638 /* 639 * Queue a packet. Start transmission if not active. 640 * Packet is placed in Information field of PPP frame. 641 */ 642 int 643 pppoutput(ifp, m0, dst, rtp) 644 struct ifnet *ifp; 645 struct mbuf *m0; 646 struct sockaddr *dst; 647 struct rtentry *rtp; 648 { 649 register struct ppp_softc *sc = ifp->if_softc; 650 int protocol, address, control; 651 u_char *cp; 652 int s, error; 653 struct ip *ip; 654 struct ifqueue *ifq; 655 enum NPmode mode; 656 int len; 657 struct mbuf *m; 658 659 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 660 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 661 error = ENETDOWN; /* sort of */ 662 goto bad; 663 } 664 665 /* 666 * Compute PPP header. 667 */ 668 m0->m_flags &= ~M_HIGHPRI; 669 switch (dst->sa_family) { 670 #ifdef INET 671 case AF_INET: 672 address = PPP_ALLSTATIONS; 673 control = PPP_UI; 674 protocol = PPP_IP; 675 mode = sc->sc_npmode[NP_IP]; 676 677 /* 678 * If this packet has the "low delay" bit set in the IP header, 679 * put it on the fastq instead. 680 */ 681 ip = mtod(m0, struct ip *); 682 if (ip->ip_tos & IPTOS_LOWDELAY) 683 m0->m_flags |= M_HIGHPRI; 684 break; 685 #endif 686 case AF_UNSPEC: 687 address = PPP_ADDRESS(dst->sa_data); 688 control = PPP_CONTROL(dst->sa_data); 689 protocol = PPP_PROTOCOL(dst->sa_data); 690 mode = NPMODE_PASS; 691 break; 692 default: 693 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 694 error = EAFNOSUPPORT; 695 goto bad; 696 } 697 698 /* 699 * Drop this packet, or return an error, if necessary. 700 */ 701 if (mode == NPMODE_ERROR) { 702 error = ENETDOWN; 703 goto bad; 704 } 705 if (mode == NPMODE_DROP) { 706 error = 0; 707 goto bad; 708 } 709 710 /* 711 * Add PPP header. If no space in first mbuf, allocate another. 712 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 713 */ 714 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 715 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 716 if (m0 == 0) { 717 error = ENOBUFS; 718 goto bad; 719 } 720 m0->m_len = 0; 721 } else 722 m0->m_data -= PPP_HDRLEN; 723 724 cp = mtod(m0, u_char *); 725 *cp++ = address; 726 *cp++ = control; 727 *cp++ = protocol >> 8; 728 *cp++ = protocol & 0xff; 729 m0->m_len += PPP_HDRLEN; 730 731 len = 0; 732 for (m = m0; m != 0; m = m->m_next) 733 len += m->m_len; 734 735 if (sc->sc_flags & SC_LOG_OUTPKT) { 736 printf("%s output: ", ifp->if_xname); 737 pppdumpm(m0); 738 } 739 740 #if defined(PPP_FILTER) || NBPFILTER > 0 741 *mtod(m0, u_char *) = SLIPDIR_OUT; 742 #endif 743 744 if ((protocol & 0x8000) == 0) { 745 #ifdef PPP_FILTER 746 /* 747 * Apply the pass and active filters to the packet, 748 * but only if it is a data packet. 749 */ 750 if (sc->sc_pass_filt.bf_insns != 0 751 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 752 len, 0) == 0) { 753 error = 0; /* drop this packet */ 754 goto bad; 755 } 756 757 /* 758 * Update the time we sent the most recent packet. 759 */ 760 if (sc->sc_active_filt.bf_insns == 0 761 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 762 sc->sc_last_sent = time.tv_sec; 763 764 #else 765 /* 766 * Update the time we sent the most recent packet. 767 */ 768 sc->sc_last_sent = time.tv_sec; 769 #endif /* PPP_FILTER */ 770 } 771 772 #if NBPFILTER > 0 773 /* 774 * See if bpf wants to look at the packet. 775 */ 776 if (sc->sc_bpf) 777 bpf_mtap(sc->sc_bpf, m0); 778 #endif 779 780 #if defined(PPP_FILTER) || NBPFILTER > 0 781 *mtod(m0, u_char *) = address; 782 #endif 783 784 /* 785 * Put the packet on the appropriate queue. 786 */ 787 s = splimp(); 788 if (mode == NPMODE_QUEUE) { 789 /* XXX we should limit the number of packets on this queue */ 790 *sc->sc_npqtail = m0; 791 m0->m_nextpkt = NULL; 792 sc->sc_npqtail = &m0->m_nextpkt; 793 } else { 794 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 795 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 796 IF_DROP(ifq); 797 splx(s); 798 sc->sc_if.if_oerrors++; 799 sc->sc_stats.ppp_oerrors++; 800 error = ENOBUFS; 801 goto bad; 802 } 803 IF_ENQUEUE(ifq, m0); 804 ppp_restart(sc); 805 } 806 ifp->if_lastchange = time; 807 ifp->if_opackets++; 808 ifp->if_obytes += len; 809 810 splx(s); 811 return (0); 812 813 bad: 814 m_freem(m0); 815 return (error); 816 } 817 818 /* 819 * After a change in the NPmode for some NP, move packets from the 820 * npqueue to the send queue or the fast queue as appropriate. 821 * Should be called at splimp, since we muck with the queues. 822 */ 823 static void 824 ppp_requeue(sc) 825 struct ppp_softc *sc; 826 { 827 struct mbuf *m, **mpp; 828 struct ifqueue *ifq; 829 enum NPmode mode; 830 831 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 832 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 833 case PPP_IP: 834 mode = sc->sc_npmode[NP_IP]; 835 break; 836 default: 837 mode = NPMODE_PASS; 838 } 839 840 switch (mode) { 841 case NPMODE_PASS: 842 /* 843 * This packet can now go on one of the queues to be sent. 844 */ 845 *mpp = m->m_nextpkt; 846 m->m_nextpkt = NULL; 847 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 848 if (IF_QFULL(ifq)) { 849 IF_DROP(ifq); 850 sc->sc_if.if_oerrors++; 851 sc->sc_stats.ppp_oerrors++; 852 } else 853 IF_ENQUEUE(ifq, m); 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 int s; 899 900 /* 901 * Grab a packet to send: first try the fast queue, then the 902 * normal queue. 903 */ 904 s = splimp(); 905 IF_DEQUEUE(&sc->sc_fastq, m); 906 if (m == NULL) 907 IF_DEQUEUE(&sc->sc_if.if_snd, m); 908 splx(s); 909 910 if (m == NULL) 911 return NULL; 912 913 ++sc->sc_stats.ppp_opackets; 914 915 /* 916 * Extract the ppp header of the new packet. 917 * The ppp header will be in one mbuf. 918 */ 919 cp = mtod(m, u_char *); 920 address = PPP_ADDRESS(cp); 921 control = PPP_CONTROL(cp); 922 protocol = PPP_PROTOCOL(cp); 923 924 switch (protocol) { 925 case PPP_IP: 926 #ifdef VJC 927 /* 928 * If the packet is a TCP/IP packet, see if we can compress it. 929 */ 930 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 931 struct ip *ip; 932 int type; 933 934 mp = m; 935 ip = (struct ip *) (cp + PPP_HDRLEN); 936 if (mp->m_len <= PPP_HDRLEN) { 937 mp = mp->m_next; 938 if (mp == NULL) 939 break; 940 ip = mtod(mp, struct ip *); 941 } 942 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 943 if (ip->ip_p == IPPROTO_TCP) { 944 type = sl_compress_tcp(mp, ip, sc->sc_comp, 945 !(sc->sc_flags & SC_NO_TCP_CCID)); 946 switch (type) { 947 case TYPE_UNCOMPRESSED_TCP: 948 protocol = PPP_VJC_UNCOMP; 949 break; 950 case TYPE_COMPRESSED_TCP: 951 protocol = PPP_VJC_COMP; 952 cp = mtod(m, u_char *); 953 cp[0] = address; /* header has moved */ 954 cp[1] = control; 955 cp[2] = 0; 956 break; 957 } 958 cp[3] = protocol; /* update protocol in PPP header */ 959 } 960 } 961 #endif /* VJC */ 962 break; 963 964 #ifdef PPP_COMPRESS 965 case PPP_CCP: 966 ppp_ccp(sc, m, 0); 967 break; 968 #endif /* PPP_COMPRESS */ 969 } 970 971 #ifdef PPP_COMPRESS 972 if (protocol != PPP_LCP && protocol != PPP_CCP 973 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 974 struct mbuf *mcomp = NULL; 975 int slen, clen; 976 977 slen = 0; 978 for (mp = m; mp != NULL; mp = mp->m_next) 979 slen += mp->m_len; 980 clen = (*sc->sc_xcomp->compress) 981 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 982 if (mcomp != NULL) { 983 if (sc->sc_flags & SC_CCP_UP) { 984 /* Send the compressed packet instead of the original. */ 985 m_freem(m); 986 m = mcomp; 987 cp = mtod(m, u_char *); 988 protocol = cp[3]; 989 } else { 990 /* Can't transmit compressed packets until CCP is up. */ 991 m_freem(mcomp); 992 } 993 } 994 } 995 #endif /* PPP_COMPRESS */ 996 997 /* 998 * Compress the address/control and protocol, if possible. 999 */ 1000 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1001 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1002 protocol != PPP_LCP) { 1003 /* can compress address/control */ 1004 m->m_data += 2; 1005 m->m_len -= 2; 1006 } 1007 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1008 /* can compress protocol */ 1009 if (mtod(m, u_char *) == cp) { 1010 cp[2] = cp[1]; /* move address/control up */ 1011 cp[1] = cp[0]; 1012 } 1013 ++m->m_data; 1014 --m->m_len; 1015 } 1016 1017 return m; 1018 } 1019 1020 /* 1021 * Software interrupt routine, called at splsoftnet. 1022 */ 1023 void 1024 pppintr() 1025 { 1026 struct ppp_softc *sc; 1027 int i, s, s2; 1028 struct mbuf *m; 1029 1030 sc = ppp_softc; 1031 s = splsoftnet(); 1032 for (i = 0; i < NPPP; ++i, ++sc) { 1033 if (!(sc->sc_flags & SC_TBUSY) 1034 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head 1035 || sc->sc_outm)) { 1036 s2 = splimp(); 1037 sc->sc_flags |= SC_TBUSY; 1038 splx(s2); 1039 (*sc->sc_start)(sc); 1040 } 1041 for (;;) { 1042 s2 = splimp(); 1043 IF_DEQUEUE(&sc->sc_rawq, m); 1044 splx(s2); 1045 if (m == NULL) 1046 break; 1047 ppp_inproc(sc, m); 1048 } 1049 } 1050 splx(s); 1051 } 1052 1053 #ifdef PPP_COMPRESS 1054 /* 1055 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1056 * 0 if it is about to be transmitted. 1057 */ 1058 static void 1059 ppp_ccp(sc, m, rcvd) 1060 struct ppp_softc *sc; 1061 struct mbuf *m; 1062 int rcvd; 1063 { 1064 u_char *dp, *ep; 1065 struct mbuf *mp; 1066 int slen, s; 1067 1068 /* 1069 * Get a pointer to the data after the PPP header. 1070 */ 1071 if (m->m_len <= PPP_HDRLEN) { 1072 mp = m->m_next; 1073 if (mp == NULL) 1074 return; 1075 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1076 } else { 1077 mp = m; 1078 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1079 } 1080 1081 ep = mtod(mp, u_char *) + mp->m_len; 1082 if (dp + CCP_HDRLEN > ep) 1083 return; 1084 slen = CCP_LENGTH(dp); 1085 if (dp + slen > ep) { 1086 if (sc->sc_flags & SC_DEBUG) 1087 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1088 dp, slen, mtod(mp, u_char *), mp->m_len); 1089 return; 1090 } 1091 1092 switch (CCP_CODE(dp)) { 1093 case CCP_CONFREQ: 1094 case CCP_TERMREQ: 1095 case CCP_TERMACK: 1096 /* CCP must be going down - disable compression */ 1097 if (sc->sc_flags & SC_CCP_UP) { 1098 s = splimp(); 1099 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1100 splx(s); 1101 } 1102 break; 1103 1104 case CCP_CONFACK: 1105 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1106 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1107 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1108 if (!rcvd) { 1109 /* we're agreeing to send compressed packets. */ 1110 if (sc->sc_xc_state != NULL 1111 && (*sc->sc_xcomp->comp_init) 1112 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1113 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1114 s = splimp(); 1115 sc->sc_flags |= SC_COMP_RUN; 1116 splx(s); 1117 } 1118 } else { 1119 /* peer is agreeing to send compressed packets. */ 1120 if (sc->sc_rc_state != NULL 1121 && (*sc->sc_rcomp->decomp_init) 1122 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1123 sc->sc_unit, 0, sc->sc_mru, 1124 sc->sc_flags & SC_DEBUG)) { 1125 s = splimp(); 1126 sc->sc_flags |= SC_DECOMP_RUN; 1127 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1128 splx(s); 1129 } 1130 } 1131 } 1132 break; 1133 1134 case CCP_RESETACK: 1135 if (sc->sc_flags & SC_CCP_UP) { 1136 if (!rcvd) { 1137 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1138 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1139 } else { 1140 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1141 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1142 s = splimp(); 1143 sc->sc_flags &= ~SC_DC_ERROR; 1144 splx(s); 1145 } 1146 } 1147 } 1148 break; 1149 } 1150 } 1151 1152 /* 1153 * CCP is down; free (de)compressor state if necessary. 1154 */ 1155 static void 1156 ppp_ccp_closed(sc) 1157 struct ppp_softc *sc; 1158 { 1159 if (sc->sc_xc_state) { 1160 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1161 sc->sc_xc_state = NULL; 1162 } 1163 if (sc->sc_rc_state) { 1164 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1165 sc->sc_rc_state = NULL; 1166 } 1167 } 1168 #endif /* PPP_COMPRESS */ 1169 1170 /* 1171 * PPP packet input routine. 1172 * The caller has checked and removed the FCS and has inserted 1173 * the address/control bytes and the protocol high byte if they 1174 * were omitted. 1175 */ 1176 void 1177 ppppktin(sc, m, lost) 1178 struct ppp_softc *sc; 1179 struct mbuf *m; 1180 int lost; 1181 { 1182 int s = splimp(); 1183 1184 if (lost) 1185 m->m_flags |= M_ERRMARK; 1186 IF_ENQUEUE(&sc->sc_rawq, m); 1187 schednetisr(NETISR_PPP); 1188 splx(s); 1189 } 1190 1191 /* 1192 * Process a received PPP packet, doing decompression as necessary. 1193 * Should be called at splsoftnet. 1194 */ 1195 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1196 TYPE_UNCOMPRESSED_TCP) 1197 1198 static void 1199 ppp_inproc(sc, m) 1200 struct ppp_softc *sc; 1201 struct mbuf *m; 1202 { 1203 struct ifnet *ifp = &sc->sc_if; 1204 struct ifqueue *inq; 1205 int s, ilen, xlen, proto, rv; 1206 u_char *cp, adrs, ctrl; 1207 struct mbuf *mp, *dmp = NULL; 1208 u_char *iphdr; 1209 u_int hlen; 1210 1211 sc->sc_stats.ppp_ipackets++; 1212 1213 if (sc->sc_flags & SC_LOG_INPKT) { 1214 ilen = 0; 1215 for (mp = m; mp != NULL; mp = mp->m_next) 1216 ilen += mp->m_len; 1217 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1218 pppdumpm(m); 1219 } 1220 1221 cp = mtod(m, u_char *); 1222 adrs = PPP_ADDRESS(cp); 1223 ctrl = PPP_CONTROL(cp); 1224 proto = PPP_PROTOCOL(cp); 1225 1226 if (m->m_flags & M_ERRMARK) { 1227 m->m_flags &= ~M_ERRMARK; 1228 s = splimp(); 1229 sc->sc_flags |= SC_VJ_RESET; 1230 splx(s); 1231 } 1232 1233 #ifdef PPP_COMPRESS 1234 /* 1235 * Decompress this packet if necessary, update the receiver's 1236 * dictionary, or take appropriate action on a CCP packet. 1237 */ 1238 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1239 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1240 /* decompress this packet */ 1241 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1242 if (rv == DECOMP_OK) { 1243 m_freem(m); 1244 if (dmp == NULL) { 1245 /* no error, but no decompressed packet produced */ 1246 return; 1247 } 1248 m = dmp; 1249 cp = mtod(m, u_char *); 1250 proto = PPP_PROTOCOL(cp); 1251 1252 } else { 1253 /* 1254 * An error has occurred in decompression. 1255 * Pass the compressed packet up to pppd, which may take 1256 * CCP down or issue a Reset-Req. 1257 */ 1258 if (sc->sc_flags & SC_DEBUG) 1259 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1260 s = splimp(); 1261 sc->sc_flags |= SC_VJ_RESET; 1262 if (rv == DECOMP_ERROR) 1263 sc->sc_flags |= SC_DC_ERROR; 1264 else 1265 sc->sc_flags |= SC_DC_FERROR; 1266 splx(s); 1267 } 1268 1269 } else { 1270 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1271 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1272 } 1273 if (proto == PPP_CCP) { 1274 ppp_ccp(sc, m, 1); 1275 } 1276 } 1277 #endif 1278 1279 ilen = 0; 1280 for (mp = m; mp != NULL; mp = mp->m_next) 1281 ilen += mp->m_len; 1282 1283 #ifdef VJC 1284 if (sc->sc_flags & SC_VJ_RESET) { 1285 /* 1286 * If we've missed a packet, we must toss subsequent compressed 1287 * packets which don't have an explicit connection ID. 1288 */ 1289 if (sc->sc_comp) 1290 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1291 s = splimp(); 1292 sc->sc_flags &= ~SC_VJ_RESET; 1293 splx(s); 1294 } 1295 1296 /* 1297 * See if we have a VJ-compressed packet to uncompress. 1298 */ 1299 if (proto == PPP_VJC_COMP) { 1300 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1301 goto bad; 1302 1303 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1304 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1305 sc->sc_comp, &iphdr, &hlen); 1306 1307 if (xlen <= 0) { 1308 if (sc->sc_flags & SC_DEBUG) 1309 printf("%s: VJ uncompress failed on type comp\n", 1310 ifp->if_xname); 1311 goto bad; 1312 } 1313 1314 /* Copy the PPP and IP headers into a new mbuf. */ 1315 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1316 if (mp == NULL) 1317 goto bad; 1318 mp->m_len = 0; 1319 mp->m_next = NULL; 1320 if (hlen + PPP_HDRLEN > MHLEN) { 1321 MCLGET(mp, M_DONTWAIT); 1322 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1323 m_freem(mp); 1324 goto bad; /* lose if big headers and no clusters */ 1325 } 1326 } 1327 cp = mtod(mp, u_char *); 1328 cp[0] = adrs; 1329 cp[1] = ctrl; 1330 cp[2] = 0; 1331 cp[3] = PPP_IP; 1332 proto = PPP_IP; 1333 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1334 mp->m_len = hlen + PPP_HDRLEN; 1335 1336 /* 1337 * Trim the PPP and VJ headers off the old mbuf 1338 * and stick the new and old mbufs together. 1339 */ 1340 m->m_data += PPP_HDRLEN + xlen; 1341 m->m_len -= PPP_HDRLEN + xlen; 1342 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1343 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1344 mp->m_len += m->m_len; 1345 MFREE(m, mp->m_next); 1346 } else 1347 mp->m_next = m; 1348 m = mp; 1349 ilen += hlen - xlen; 1350 1351 } else if (proto == PPP_VJC_UNCOMP) { 1352 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1353 goto bad; 1354 1355 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1356 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1357 sc->sc_comp, &iphdr, &hlen); 1358 1359 if (xlen < 0) { 1360 if (sc->sc_flags & SC_DEBUG) 1361 printf("%s: VJ uncompress failed on type uncomp\n", 1362 ifp->if_xname); 1363 goto bad; 1364 } 1365 1366 proto = PPP_IP; 1367 cp[3] = PPP_IP; 1368 } 1369 #endif /* VJC */ 1370 1371 /* 1372 * If the packet will fit in a header mbuf, don't waste a 1373 * whole cluster on it. 1374 */ 1375 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1376 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1377 if (mp != NULL) { 1378 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1379 m_freem(m); 1380 m = mp; 1381 m->m_len = ilen; 1382 } 1383 } 1384 m->m_pkthdr.len = ilen; 1385 m->m_pkthdr.rcvif = ifp; 1386 1387 #if defined(PPP_FILTER) || NBPFILTER > 0 1388 *mtod(m, u_char *) = SLIPDIR_IN; 1389 #endif 1390 1391 if ((proto & 0x8000) == 0) { 1392 #ifdef PPP_FILTER 1393 /* 1394 * See whether we want to pass this packet, and 1395 * if it counts as link activity. 1396 */ 1397 adrs = *mtod(m, u_char *); /* save address field */ 1398 if (sc->sc_pass_filt.bf_insns != 0 1399 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1400 ilen, 0) == 0) { 1401 /* drop this packet */ 1402 m_freem(m); 1403 return; 1404 } 1405 if (sc->sc_active_filt.bf_insns == 0 1406 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1407 sc->sc_last_recv = time.tv_sec; 1408 1409 #else 1410 /* 1411 * Record the time that we received this packet. 1412 */ 1413 sc->sc_last_recv = time.tv_sec; 1414 #endif /* PPP_FILTER */ 1415 } 1416 1417 #if NBPFILTER > 0 1418 /* See if bpf wants to look at the packet. */ 1419 if (sc->sc_bpf) 1420 bpf_mtap(sc->sc_bpf, m); 1421 #endif 1422 1423 #if defined(PPP_FILTER) || NBPFILTER > 0 1424 *mtod(m, u_char *) = adrs; 1425 #endif 1426 1427 rv = 0; 1428 switch (proto) { 1429 #ifdef INET 1430 case PPP_IP: 1431 /* 1432 * IP packet - take off the ppp header and pass it up to IP. 1433 */ 1434 if ((ifp->if_flags & IFF_UP) == 0 1435 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1436 /* interface is down - drop the packet. */ 1437 m_freem(m); 1438 return; 1439 } 1440 m->m_pkthdr.len -= PPP_HDRLEN; 1441 m->m_data += PPP_HDRLEN; 1442 m->m_len -= PPP_HDRLEN; 1443 #ifdef GATEWAY 1444 if (ipflow_fastforward(m)) 1445 return; 1446 #endif 1447 schednetisr(NETISR_IP); 1448 inq = &ipintrq; 1449 break; 1450 #endif 1451 1452 default: 1453 /* 1454 * Some other protocol - place on input queue for read(). 1455 */ 1456 inq = &sc->sc_inq; 1457 rv = 1; 1458 break; 1459 } 1460 1461 /* 1462 * Put the packet on the appropriate input queue. 1463 */ 1464 s = splimp(); 1465 if (IF_QFULL(inq)) { 1466 IF_DROP(inq); 1467 splx(s); 1468 if (sc->sc_flags & SC_DEBUG) 1469 printf("%s: input queue full\n", ifp->if_xname); 1470 ifp->if_iqdrops++; 1471 goto bad; 1472 } 1473 IF_ENQUEUE(inq, m); 1474 splx(s); 1475 ifp->if_ipackets++; 1476 ifp->if_ibytes += ilen; 1477 ifp->if_lastchange = time; 1478 1479 if (rv) 1480 (*sc->sc_ctlp)(sc); 1481 1482 return; 1483 1484 bad: 1485 m_freem(m); 1486 sc->sc_if.if_ierrors++; 1487 sc->sc_stats.ppp_ierrors++; 1488 } 1489 1490 #define MAX_DUMP_BYTES 128 1491 1492 static void 1493 pppdumpm(m0) 1494 struct mbuf *m0; 1495 { 1496 char buf[3*MAX_DUMP_BYTES+4]; 1497 char *bp = buf; 1498 struct mbuf *m; 1499 static char digits[] = "0123456789abcdef"; 1500 1501 for (m = m0; m; m = m->m_next) { 1502 int l = m->m_len; 1503 u_char *rptr = (u_char *)m->m_data; 1504 1505 while (l--) { 1506 if (bp > buf + sizeof(buf) - 4) 1507 goto done; 1508 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1509 *bp++ = digits[*rptr++ & 0xf]; 1510 } 1511 1512 if (m->m_next) { 1513 if (bp > buf + sizeof(buf) - 3) 1514 goto done; 1515 *bp++ = '|'; 1516 } else 1517 *bp++ = ' '; 1518 } 1519 done: 1520 if (m) 1521 *bp++ = '>'; 1522 *bp = 0; 1523 printf("%s\n", buf); 1524 } 1525 1526 #endif /* NPPP > 0 */ 1527
Indexes created Fri Sep 26 08:10:20 GMT 2025