if_ppp.c revision 1.43
1 /* $NetBSD: if_ppp.c,v 1.43 1998/07/06 13:51:32 jtk 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 86 #include <sys/param.h> 87 #include <sys/proc.h> 88 #include <sys/mbuf.h> 89 #include <sys/socket.h> 90 #include <sys/ioctl.h> 91 #include <sys/kernel.h> 92 #include <sys/systm.h> 93 #include <sys/time.h> 94 #include <sys/malloc.h> 95 96 #include <net/if.h> 97 #include <net/if_types.h> 98 #include <net/netisr.h> 99 #include <net/route.h> 100 #ifdef PPP_FILTER 101 #include <net/bpf.h> 102 #endif 103 104 #ifdef INET 105 #include <netinet/in.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/in_var.h> 108 #include <netinet/ip.h> 109 #endif 110 111 #include "bpfilter.h" 112 #if NBPFILTER > 0 113 #include <sys/time.h> 114 #include <net/bpf.h> 115 #endif 116 117 #ifdef VJC 118 #include <net/slcompress.h> 119 #endif 120 121 #include <net/ppp_defs.h> 122 #include <net/if_ppp.h> 123 #include <net/if_pppvar.h> 124 #include <machine/cpu.h> 125 126 #ifdef PPP_COMPRESS 127 #define PACKETPTR struct mbuf * 128 #include <net/ppp-comp.h> 129 #endif 130 131 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 132 static void ppp_requeue __P((struct ppp_softc *)); 133 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 134 static void ppp_ccp_closed __P((struct ppp_softc *)); 135 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 136 static void pppdumpm __P((struct mbuf *m0)); 137 138 /* 139 * Some useful mbuf macros not in mbuf.h. 140 */ 141 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 142 143 #define M_DATASTART(m) \ 144 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 145 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 146 147 #define M_DATASIZE(m) \ 148 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 149 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 150 151 /* 152 * We steal two bits in the mbuf m_flags, to mark high-priority packets 153 * for output, and received packets following lost/corrupted packets. 154 */ 155 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 156 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 157 158 159 #ifdef PPP_COMPRESS 160 /* 161 * List of compressors we know about. 162 * We leave some space so maybe we can modload compressors. 163 */ 164 165 extern struct compressor ppp_bsd_compress; 166 extern struct compressor ppp_deflate, ppp_deflate_draft; 167 168 struct compressor *ppp_compressors[8] = { 169 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 170 &ppp_bsd_compress, 171 #endif 172 #if DO_DEFLATE && defined(PPP_DEFLATE) 173 &ppp_deflate, 174 &ppp_deflate_draft, 175 #endif 176 NULL 177 }; 178 #endif /* PPP_COMPRESS */ 179 180 181 /* 182 * Called from boot code to establish ppp interfaces. 183 */ 184 void 185 pppattach() 186 { 187 register struct ppp_softc *sc; 188 register int i = 0; 189 190 for (sc = ppp_softc; i < NPPP; sc++) { 191 sc->sc_unit = i; /* XXX */ 192 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 193 sc->sc_if.if_softc = sc; 194 sc->sc_if.if_mtu = PPP_MTU; 195 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 196 sc->sc_if.if_type = IFT_PPP; 197 sc->sc_if.if_hdrlen = PPP_HDRLEN; 198 sc->sc_if.if_ioctl = pppsioctl; 199 sc->sc_if.if_output = pppoutput; 200 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 201 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 202 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 203 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 204 if_attach(&sc->sc_if); 205 #if NBPFILTER > 0 206 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 207 #endif 208 } 209 } 210 211 /* 212 * Allocate a ppp interface unit and initialize it. 213 */ 214 struct ppp_softc * 215 pppalloc(pid) 216 pid_t pid; 217 { 218 int nppp, i; 219 struct ppp_softc *sc; 220 221 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 222 if (sc->sc_xfer == pid) { 223 sc->sc_xfer = 0; 224 return sc; 225 } 226 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 227 if (sc->sc_devp == NULL) 228 break; 229 if (nppp >= NPPP) 230 return NULL; 231 232 sc->sc_flags = 0; 233 sc->sc_mru = PPP_MRU; 234 sc->sc_relinq = NULL; 235 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 236 #ifdef VJC 237 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 238 M_DEVBUF, M_NOWAIT); 239 if (sc->sc_comp) 240 sl_compress_init(sc->sc_comp); 241 #endif 242 #ifdef PPP_COMPRESS 243 sc->sc_xc_state = NULL; 244 sc->sc_rc_state = NULL; 245 #endif /* PPP_COMPRESS */ 246 for (i = 0; i < NUM_NP; ++i) 247 sc->sc_npmode[i] = NPMODE_ERROR; 248 sc->sc_npqueue = NULL; 249 sc->sc_npqtail = &sc->sc_npqueue; 250 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 251 252 return sc; 253 } 254 255 /* 256 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 257 */ 258 void 259 pppdealloc(sc) 260 struct ppp_softc *sc; 261 { 262 struct mbuf *m; 263 264 if_down(&sc->sc_if); 265 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 266 sc->sc_devp = NULL; 267 sc->sc_xfer = 0; 268 for (;;) { 269 IF_DEQUEUE(&sc->sc_rawq, m); 270 if (m == NULL) 271 break; 272 m_freem(m); 273 } 274 for (;;) { 275 IF_DEQUEUE(&sc->sc_inq, m); 276 if (m == NULL) 277 break; 278 m_freem(m); 279 } 280 for (;;) { 281 IF_DEQUEUE(&sc->sc_fastq, m); 282 if (m == NULL) 283 break; 284 m_freem(m); 285 } 286 while ((m = sc->sc_npqueue) != NULL) { 287 sc->sc_npqueue = m->m_nextpkt; 288 m_freem(m); 289 } 290 if (sc->sc_togo != NULL) { 291 m_freem(sc->sc_togo); 292 sc->sc_togo = NULL; 293 } 294 #ifdef PPP_COMPRESS 295 ppp_ccp_closed(sc); 296 sc->sc_xc_state = NULL; 297 sc->sc_rc_state = NULL; 298 #endif /* PPP_COMPRESS */ 299 #ifdef PPP_FILTER 300 if (sc->sc_pass_filt.bf_insns != 0) { 301 FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); 302 sc->sc_pass_filt.bf_insns = 0; 303 sc->sc_pass_filt.bf_len = 0; 304 } 305 if (sc->sc_active_filt.bf_insns != 0) { 306 FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); 307 sc->sc_active_filt.bf_insns = 0; 308 sc->sc_active_filt.bf_len = 0; 309 } 310 #endif /* PPP_FILTER */ 311 #ifdef VJC 312 if (sc->sc_comp != 0) { 313 FREE(sc->sc_comp, M_DEVBUF); 314 sc->sc_comp = 0; 315 } 316 #endif 317 } 318 319 /* 320 * Ioctl routine for generic ppp devices. 321 */ 322 int 323 pppioctl(sc, cmd, data, flag, p) 324 struct ppp_softc *sc; 325 u_long cmd; 326 caddr_t data; 327 int flag; 328 struct proc *p; 329 { 330 int s, error, flags, mru, nb, npx; 331 struct ppp_option_data *odp; 332 struct compressor **cp; 333 struct npioctl *npi; 334 time_t t; 335 #ifdef PPP_FILTER 336 struct bpf_program *bp, *nbp; 337 struct bpf_insn *newcode, *oldcode; 338 int newcodelen; 339 #endif /* PPP_FILTER */ 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 #ifdef PPP_FILTER 496 case PPPIOCSPASS: 497 case PPPIOCSACTIVE: 498 nbp = (struct bpf_program *) data; 499 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 500 return EINVAL; 501 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 502 if (newcodelen != 0) { 503 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 504 if (newcode == 0) { 505 return EINVAL; /* or sumpin */ 506 } 507 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 508 newcodelen)) != 0) { 509 FREE(newcode, M_DEVBUF); 510 return error; 511 } 512 if (!bpf_validate(newcode, nbp->bf_len)) { 513 FREE(newcode, M_DEVBUF); 514 return EINVAL; 515 } 516 } else 517 newcode = 0; 518 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 519 oldcode = bp->bf_insns; 520 s = splimp(); 521 bp->bf_len = nbp->bf_len; 522 bp->bf_insns = newcode; 523 splx(s); 524 if (oldcode != 0) 525 FREE(oldcode, M_DEVBUF); 526 break; 527 #endif 528 529 default: 530 return (-1); 531 } 532 return (0); 533 } 534 535 /* 536 * Process an ioctl request to the ppp network interface. 537 */ 538 static int 539 pppsioctl(ifp, cmd, data) 540 register struct ifnet *ifp; 541 u_long cmd; 542 caddr_t data; 543 { 544 register struct proc *p = curproc; /* XXX */ 545 register struct ppp_softc *sc = ifp->if_softc; 546 register struct ifaddr *ifa = (struct ifaddr *)data; 547 register struct ifreq *ifr = (struct ifreq *)data; 548 struct ppp_stats *psp; 549 #ifdef PPP_COMPRESS 550 struct ppp_comp_stats *pcp; 551 #endif 552 int s = splimp(), error = 0; 553 554 switch (cmd) { 555 case SIOCSIFFLAGS: 556 if ((ifp->if_flags & IFF_RUNNING) == 0) 557 ifp->if_flags &= ~IFF_UP; 558 break; 559 560 case SIOCSIFADDR: 561 if (ifa->ifa_addr->sa_family != AF_INET) 562 error = EAFNOSUPPORT; 563 break; 564 565 case SIOCSIFDSTADDR: 566 if (ifa->ifa_addr->sa_family != AF_INET) 567 error = EAFNOSUPPORT; 568 break; 569 570 case SIOCSIFMTU: 571 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 572 break; 573 sc->sc_if.if_mtu = ifr->ifr_mtu; 574 break; 575 576 case SIOCGIFMTU: 577 ifr->ifr_mtu = sc->sc_if.if_mtu; 578 break; 579 580 case SIOCADDMULTI: 581 case SIOCDELMULTI: 582 if (ifr == 0) { 583 error = EAFNOSUPPORT; 584 break; 585 } 586 switch(ifr->ifr_addr.sa_family) { 587 #ifdef INET 588 case AF_INET: 589 break; 590 #endif 591 default: 592 error = EAFNOSUPPORT; 593 break; 594 } 595 break; 596 597 case SIOCGPPPSTATS: 598 psp = &((struct ifpppstatsreq *) data)->stats; 599 bzero(psp, sizeof(*psp)); 600 psp->p = sc->sc_stats; 601 #if defined(VJC) && !defined(SL_NO_STATS) 602 if (sc->sc_comp) { 603 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 604 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 605 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 606 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 607 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 608 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 609 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 610 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 611 } 612 #endif /* VJC */ 613 break; 614 615 #ifdef PPP_COMPRESS 616 case SIOCGPPPCSTATS: 617 pcp = &((struct ifpppcstatsreq *) data)->stats; 618 bzero(pcp, sizeof(*pcp)); 619 if (sc->sc_xc_state != NULL) 620 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 621 if (sc->sc_rc_state != NULL) 622 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 623 break; 624 #endif /* PPP_COMPRESS */ 625 626 default: 627 error = EINVAL; 628 } 629 splx(s); 630 return (error); 631 } 632 633 /* 634 * Queue a packet. Start transmission if not active. 635 * Packet is placed in Information field of PPP frame. 636 */ 637 int 638 pppoutput(ifp, m0, dst, rtp) 639 struct ifnet *ifp; 640 struct mbuf *m0; 641 struct sockaddr *dst; 642 struct rtentry *rtp; 643 { 644 register struct ppp_softc *sc = ifp->if_softc; 645 int protocol, address, control; 646 u_char *cp; 647 int s, error; 648 struct ip *ip; 649 struct ifqueue *ifq; 650 enum NPmode mode; 651 int len; 652 struct mbuf *m; 653 654 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 655 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 656 error = ENETDOWN; /* sort of */ 657 goto bad; 658 } 659 660 /* 661 * Compute PPP header. 662 */ 663 m0->m_flags &= ~M_HIGHPRI; 664 switch (dst->sa_family) { 665 #ifdef INET 666 case AF_INET: 667 address = PPP_ALLSTATIONS; 668 control = PPP_UI; 669 protocol = PPP_IP; 670 mode = sc->sc_npmode[NP_IP]; 671 672 /* 673 * If this packet has the "low delay" bit set in the IP header, 674 * put it on the fastq instead. 675 */ 676 ip = mtod(m0, struct ip *); 677 if (ip->ip_tos & IPTOS_LOWDELAY) 678 m0->m_flags |= M_HIGHPRI; 679 break; 680 #endif 681 case AF_UNSPEC: 682 address = PPP_ADDRESS(dst->sa_data); 683 control = PPP_CONTROL(dst->sa_data); 684 protocol = PPP_PROTOCOL(dst->sa_data); 685 mode = NPMODE_PASS; 686 break; 687 default: 688 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 689 error = EAFNOSUPPORT; 690 goto bad; 691 } 692 693 /* 694 * Drop this packet, or return an error, if necessary. 695 */ 696 if (mode == NPMODE_ERROR) { 697 error = ENETDOWN; 698 goto bad; 699 } 700 if (mode == NPMODE_DROP) { 701 error = 0; 702 goto bad; 703 } 704 705 /* 706 * Add PPP header. If no space in first mbuf, allocate another. 707 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 708 */ 709 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 710 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 711 if (m0 == 0) { 712 error = ENOBUFS; 713 goto bad; 714 } 715 m0->m_len = 0; 716 } else 717 m0->m_data -= PPP_HDRLEN; 718 719 cp = mtod(m0, u_char *); 720 *cp++ = address; 721 *cp++ = control; 722 *cp++ = protocol >> 8; 723 *cp++ = protocol & 0xff; 724 m0->m_len += PPP_HDRLEN; 725 726 len = 0; 727 for (m = m0; m != 0; m = m->m_next) 728 len += m->m_len; 729 730 if (sc->sc_flags & SC_LOG_OUTPKT) { 731 printf("%s output: ", ifp->if_xname); 732 pppdumpm(m0); 733 } 734 735 if ((protocol & 0x8000) == 0) { 736 #ifdef PPP_FILTER 737 /* 738 * Apply the pass and active filters to the packet, 739 * but only if it is a data packet. 740 */ 741 *mtod(m0, u_char *) = 1; /* indicates outbound */ 742 if (sc->sc_pass_filt.bf_insns != 0 743 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 744 len, 0) == 0) { 745 error = 0; /* drop this packet */ 746 goto bad; 747 } 748 749 /* 750 * Update the time we sent the most recent packet. 751 */ 752 if (sc->sc_active_filt.bf_insns == 0 753 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 754 sc->sc_last_sent = time.tv_sec; 755 756 *mtod(m0, u_char *) = address; 757 #else 758 /* 759 * Update the time we sent the most recent packet. 760 */ 761 sc->sc_last_sent = time.tv_sec; 762 #endif /* PPP_FILTER */ 763 } 764 765 #if NBPFILTER > 0 766 /* 767 * See if bpf wants to look at the packet. 768 */ 769 if (sc->sc_bpf) 770 bpf_mtap(sc->sc_bpf, m0); 771 #endif 772 773 /* 774 * Put the packet on the appropriate queue. 775 */ 776 s = splsoftnet(); 777 if (mode == NPMODE_QUEUE) { 778 /* XXX we should limit the number of packets on this queue */ 779 *sc->sc_npqtail = m0; 780 m0->m_nextpkt = NULL; 781 sc->sc_npqtail = &m0->m_nextpkt; 782 } else { 783 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 784 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 785 IF_DROP(ifq); 786 splx(s); 787 sc->sc_if.if_oerrors++; 788 sc->sc_stats.ppp_oerrors++; 789 error = ENOBUFS; 790 goto bad; 791 } 792 IF_ENQUEUE(ifq, m0); 793 (*sc->sc_start)(sc); 794 } 795 ifp->if_lastchange = time; 796 ifp->if_opackets++; 797 ifp->if_obytes += len; 798 799 splx(s); 800 return (0); 801 802 bad: 803 m_freem(m0); 804 return (error); 805 } 806 807 /* 808 * After a change in the NPmode for some NP, move packets from the 809 * npqueue to the send queue or the fast queue as appropriate. 810 * Should be called at splsoftnet. 811 */ 812 static void 813 ppp_requeue(sc) 814 struct ppp_softc *sc; 815 { 816 struct mbuf *m, **mpp; 817 struct ifqueue *ifq; 818 enum NPmode mode; 819 820 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 821 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 822 case PPP_IP: 823 mode = sc->sc_npmode[NP_IP]; 824 break; 825 default: 826 mode = NPMODE_PASS; 827 } 828 829 switch (mode) { 830 case NPMODE_PASS: 831 /* 832 * This packet can now go on one of the queues to be sent. 833 */ 834 *mpp = m->m_nextpkt; 835 m->m_nextpkt = NULL; 836 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 837 if (IF_QFULL(ifq)) { 838 IF_DROP(ifq); 839 sc->sc_if.if_oerrors++; 840 sc->sc_stats.ppp_oerrors++; 841 } else 842 IF_ENQUEUE(ifq, m); 843 break; 844 845 case NPMODE_DROP: 846 case NPMODE_ERROR: 847 *mpp = m->m_nextpkt; 848 m_freem(m); 849 break; 850 851 case NPMODE_QUEUE: 852 mpp = &m->m_nextpkt; 853 break; 854 } 855 } 856 sc->sc_npqtail = mpp; 857 } 858 859 /* 860 * Transmitter has finished outputting some stuff; 861 * remember to call sc->sc_start later at splsoftnet. 862 */ 863 void 864 ppp_restart(sc) 865 struct ppp_softc *sc; 866 { 867 int s = splimp(); 868 869 sc->sc_flags &= ~SC_TBUSY; 870 schednetisr(NETISR_PPP); 871 splx(s); 872 } 873 874 /* 875 * Get a packet to send. This procedure is intended to be called at 876 * splsoftnet, since it may involve time-consuming operations such as 877 * applying VJ compression, packet compression, address/control and/or 878 * protocol field compression to the packet. 879 */ 880 struct mbuf * 881 ppp_dequeue(sc) 882 struct ppp_softc *sc; 883 { 884 struct mbuf *m, *mp; 885 u_char *cp; 886 int address, control, protocol; 887 888 /* 889 * Grab a packet to send: first try the fast queue, then the 890 * normal queue. 891 */ 892 IF_DEQUEUE(&sc->sc_fastq, m); 893 if (m == NULL) 894 IF_DEQUEUE(&sc->sc_if.if_snd, m); 895 if (m == NULL) 896 return NULL; 897 898 ++sc->sc_stats.ppp_opackets; 899 900 /* 901 * Extract the ppp header of the new packet. 902 * The ppp header will be in one mbuf. 903 */ 904 cp = mtod(m, u_char *); 905 address = PPP_ADDRESS(cp); 906 control = PPP_CONTROL(cp); 907 protocol = PPP_PROTOCOL(cp); 908 909 switch (protocol) { 910 case PPP_IP: 911 #ifdef VJC 912 /* 913 * If the packet is a TCP/IP packet, see if we can compress it. 914 */ 915 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 916 struct ip *ip; 917 int type; 918 919 mp = m; 920 ip = (struct ip *) (cp + PPP_HDRLEN); 921 if (mp->m_len <= PPP_HDRLEN) { 922 mp = mp->m_next; 923 if (mp == NULL) 924 break; 925 ip = mtod(mp, struct ip *); 926 } 927 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 928 if (ip->ip_p == IPPROTO_TCP) { 929 type = sl_compress_tcp(mp, ip, sc->sc_comp, 930 !(sc->sc_flags & SC_NO_TCP_CCID)); 931 switch (type) { 932 case TYPE_UNCOMPRESSED_TCP: 933 protocol = PPP_VJC_UNCOMP; 934 break; 935 case TYPE_COMPRESSED_TCP: 936 protocol = PPP_VJC_COMP; 937 cp = mtod(m, u_char *); 938 cp[0] = address; /* header has moved */ 939 cp[1] = control; 940 cp[2] = 0; 941 break; 942 } 943 cp[3] = protocol; /* update protocol in PPP header */ 944 } 945 } 946 #endif /* VJC */ 947 break; 948 949 #ifdef PPP_COMPRESS 950 case PPP_CCP: 951 ppp_ccp(sc, m, 0); 952 break; 953 #endif /* PPP_COMPRESS */ 954 } 955 956 #ifdef PPP_COMPRESS 957 if (protocol != PPP_LCP && protocol != PPP_CCP 958 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 959 struct mbuf *mcomp = NULL; 960 int slen, clen; 961 962 slen = 0; 963 for (mp = m; mp != NULL; mp = mp->m_next) 964 slen += mp->m_len; 965 clen = (*sc->sc_xcomp->compress) 966 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 967 if (mcomp != NULL) { 968 if (sc->sc_flags & SC_CCP_UP) { 969 /* Send the compressed packet instead of the original. */ 970 m_freem(m); 971 m = mcomp; 972 cp = mtod(m, u_char *); 973 protocol = cp[3]; 974 } else { 975 /* Can't transmit compressed packets until CCP is up. */ 976 m_freem(mcomp); 977 } 978 } 979 } 980 #endif /* PPP_COMPRESS */ 981 982 /* 983 * Compress the address/control and protocol, if possible. 984 */ 985 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 986 control == PPP_UI && protocol != PPP_ALLSTATIONS && 987 protocol != PPP_LCP) { 988 /* can compress address/control */ 989 m->m_data += 2; 990 m->m_len -= 2; 991 } 992 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 993 /* can compress protocol */ 994 if (mtod(m, u_char *) == cp) { 995 cp[2] = cp[1]; /* move address/control up */ 996 cp[1] = cp[0]; 997 } 998 ++m->m_data; 999 --m->m_len; 1000 } 1001 1002 return m; 1003 } 1004 1005 /* 1006 * Software interrupt routine, called at splsoftnet. 1007 */ 1008 void 1009 pppintr() 1010 { 1011 struct ppp_softc *sc; 1012 int i, s, s2; 1013 struct mbuf *m; 1014 1015 sc = ppp_softc; 1016 s = splsoftnet(); 1017 for (i = 0; i < NPPP; ++i, ++sc) { 1018 if (!(sc->sc_flags & SC_TBUSY) 1019 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) { 1020 s2 = splimp(); 1021 sc->sc_flags |= SC_TBUSY; 1022 splx(s2); 1023 (*sc->sc_start)(sc); 1024 } 1025 for (;;) { 1026 s2 = splimp(); 1027 IF_DEQUEUE(&sc->sc_rawq, m); 1028 splx(s2); 1029 if (m == NULL) 1030 break; 1031 ppp_inproc(sc, m); 1032 } 1033 } 1034 splx(s); 1035 } 1036 1037 #ifdef PPP_COMPRESS 1038 /* 1039 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1040 * 0 if it is about to be transmitted. 1041 */ 1042 static void 1043 ppp_ccp(sc, m, rcvd) 1044 struct ppp_softc *sc; 1045 struct mbuf *m; 1046 int rcvd; 1047 { 1048 u_char *dp, *ep; 1049 struct mbuf *mp; 1050 int slen, s; 1051 1052 /* 1053 * Get a pointer to the data after the PPP header. 1054 */ 1055 if (m->m_len <= PPP_HDRLEN) { 1056 mp = m->m_next; 1057 if (mp == NULL) 1058 return; 1059 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1060 } else { 1061 mp = m; 1062 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1063 } 1064 1065 ep = mtod(mp, u_char *) + mp->m_len; 1066 if (dp + CCP_HDRLEN > ep) 1067 return; 1068 slen = CCP_LENGTH(dp); 1069 if (dp + slen > ep) { 1070 if (sc->sc_flags & SC_DEBUG) 1071 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1072 dp, slen, mtod(mp, u_char *), mp->m_len); 1073 return; 1074 } 1075 1076 switch (CCP_CODE(dp)) { 1077 case CCP_CONFREQ: 1078 case CCP_TERMREQ: 1079 case CCP_TERMACK: 1080 /* CCP must be going down - disable compression */ 1081 if (sc->sc_flags & SC_CCP_UP) { 1082 s = splimp(); 1083 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1084 splx(s); 1085 } 1086 break; 1087 1088 case CCP_CONFACK: 1089 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1090 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1091 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1092 if (!rcvd) { 1093 /* we're agreeing to send compressed packets. */ 1094 if (sc->sc_xc_state != NULL 1095 && (*sc->sc_xcomp->comp_init) 1096 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1097 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1098 s = splimp(); 1099 sc->sc_flags |= SC_COMP_RUN; 1100 splx(s); 1101 } 1102 } else { 1103 /* peer is agreeing to send compressed packets. */ 1104 if (sc->sc_rc_state != NULL 1105 && (*sc->sc_rcomp->decomp_init) 1106 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1107 sc->sc_unit, 0, sc->sc_mru, 1108 sc->sc_flags & SC_DEBUG)) { 1109 s = splimp(); 1110 sc->sc_flags |= SC_DECOMP_RUN; 1111 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1112 splx(s); 1113 } 1114 } 1115 } 1116 break; 1117 1118 case CCP_RESETACK: 1119 if (sc->sc_flags & SC_CCP_UP) { 1120 if (!rcvd) { 1121 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1122 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1123 } else { 1124 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1125 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1126 s = splimp(); 1127 sc->sc_flags &= ~SC_DC_ERROR; 1128 splx(s); 1129 } 1130 } 1131 } 1132 break; 1133 } 1134 } 1135 1136 /* 1137 * CCP is down; free (de)compressor state if necessary. 1138 */ 1139 static void 1140 ppp_ccp_closed(sc) 1141 struct ppp_softc *sc; 1142 { 1143 if (sc->sc_xc_state) { 1144 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1145 sc->sc_xc_state = NULL; 1146 } 1147 if (sc->sc_rc_state) { 1148 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1149 sc->sc_rc_state = NULL; 1150 } 1151 } 1152 #endif /* PPP_COMPRESS */ 1153 1154 /* 1155 * PPP packet input routine. 1156 * The caller has checked and removed the FCS and has inserted 1157 * the address/control bytes and the protocol high byte if they 1158 * were omitted. 1159 */ 1160 void 1161 ppppktin(sc, m, lost) 1162 struct ppp_softc *sc; 1163 struct mbuf *m; 1164 int lost; 1165 { 1166 int s = splimp(); 1167 1168 if (lost) 1169 m->m_flags |= M_ERRMARK; 1170 IF_ENQUEUE(&sc->sc_rawq, m); 1171 schednetisr(NETISR_PPP); 1172 splx(s); 1173 } 1174 1175 /* 1176 * Process a received PPP packet, doing decompression as necessary. 1177 * Should be called at splsoftnet. 1178 */ 1179 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1180 TYPE_UNCOMPRESSED_TCP) 1181 1182 static void 1183 ppp_inproc(sc, m) 1184 struct ppp_softc *sc; 1185 struct mbuf *m; 1186 { 1187 struct ifnet *ifp = &sc->sc_if; 1188 struct ifqueue *inq; 1189 int s, ilen, xlen, proto, rv; 1190 u_char *cp, adrs, ctrl; 1191 struct mbuf *mp, *dmp = NULL; 1192 u_char *iphdr; 1193 u_int hlen; 1194 1195 sc->sc_stats.ppp_ipackets++; 1196 1197 if (sc->sc_flags & SC_LOG_INPKT) { 1198 ilen = 0; 1199 for (mp = m; mp != NULL; mp = mp->m_next) 1200 ilen += mp->m_len; 1201 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1202 pppdumpm(m); 1203 } 1204 1205 cp = mtod(m, u_char *); 1206 adrs = PPP_ADDRESS(cp); 1207 ctrl = PPP_CONTROL(cp); 1208 proto = PPP_PROTOCOL(cp); 1209 1210 if (m->m_flags & M_ERRMARK) { 1211 m->m_flags &= ~M_ERRMARK; 1212 s = splimp(); 1213 sc->sc_flags |= SC_VJ_RESET; 1214 splx(s); 1215 } 1216 1217 #ifdef PPP_COMPRESS 1218 /* 1219 * Decompress this packet if necessary, update the receiver's 1220 * dictionary, or take appropriate action on a CCP packet. 1221 */ 1222 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1223 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1224 /* decompress this packet */ 1225 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1226 if (rv == DECOMP_OK) { 1227 m_freem(m); 1228 if (dmp == NULL) { 1229 /* no error, but no decompressed packet produced */ 1230 return; 1231 } 1232 m = dmp; 1233 cp = mtod(m, u_char *); 1234 proto = PPP_PROTOCOL(cp); 1235 1236 } else { 1237 /* 1238 * An error has occurred in decompression. 1239 * Pass the compressed packet up to pppd, which may take 1240 * CCP down or issue a Reset-Req. 1241 */ 1242 if (sc->sc_flags & SC_DEBUG) 1243 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1244 s = splimp(); 1245 sc->sc_flags |= SC_VJ_RESET; 1246 if (rv == DECOMP_ERROR) 1247 sc->sc_flags |= SC_DC_ERROR; 1248 else 1249 sc->sc_flags |= SC_DC_FERROR; 1250 splx(s); 1251 } 1252 1253 } else { 1254 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1255 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1256 } 1257 if (proto == PPP_CCP) { 1258 ppp_ccp(sc, m, 1); 1259 } 1260 } 1261 #endif 1262 1263 ilen = 0; 1264 for (mp = m; mp != NULL; mp = mp->m_next) 1265 ilen += mp->m_len; 1266 1267 #ifdef VJC 1268 if (sc->sc_flags & SC_VJ_RESET) { 1269 /* 1270 * If we've missed a packet, we must toss subsequent compressed 1271 * packets which don't have an explicit connection ID. 1272 */ 1273 if (sc->sc_comp) 1274 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1275 s = splimp(); 1276 sc->sc_flags &= ~SC_VJ_RESET; 1277 splx(s); 1278 } 1279 1280 /* 1281 * See if we have a VJ-compressed packet to uncompress. 1282 */ 1283 if (proto == PPP_VJC_COMP) { 1284 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1285 goto bad; 1286 1287 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1288 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1289 sc->sc_comp, &iphdr, &hlen); 1290 1291 if (xlen <= 0) { 1292 if (sc->sc_flags & SC_DEBUG) 1293 printf("%s: VJ uncompress failed on type comp\n", 1294 ifp->if_xname); 1295 goto bad; 1296 } 1297 1298 /* Copy the PPP and IP headers into a new mbuf. */ 1299 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1300 if (mp == NULL) 1301 goto bad; 1302 mp->m_len = 0; 1303 mp->m_next = NULL; 1304 if (hlen + PPP_HDRLEN > MHLEN) { 1305 MCLGET(mp, M_DONTWAIT); 1306 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1307 m_freem(mp); 1308 goto bad; /* lose if big headers and no clusters */ 1309 } 1310 } 1311 cp = mtod(mp, u_char *); 1312 cp[0] = adrs; 1313 cp[1] = ctrl; 1314 cp[2] = 0; 1315 cp[3] = PPP_IP; 1316 proto = PPP_IP; 1317 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1318 mp->m_len = hlen + PPP_HDRLEN; 1319 1320 /* 1321 * Trim the PPP and VJ headers off the old mbuf 1322 * and stick the new and old mbufs together. 1323 */ 1324 m->m_data += PPP_HDRLEN + xlen; 1325 m->m_len -= PPP_HDRLEN + xlen; 1326 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1327 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1328 mp->m_len += m->m_len; 1329 MFREE(m, mp->m_next); 1330 } else 1331 mp->m_next = m; 1332 m = mp; 1333 ilen += hlen - xlen; 1334 1335 } else if (proto == PPP_VJC_UNCOMP) { 1336 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1337 goto bad; 1338 1339 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1340 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1341 sc->sc_comp, &iphdr, &hlen); 1342 1343 if (xlen < 0) { 1344 if (sc->sc_flags & SC_DEBUG) 1345 printf("%s: VJ uncompress failed on type uncomp\n", 1346 ifp->if_xname); 1347 goto bad; 1348 } 1349 1350 proto = PPP_IP; 1351 cp[3] = PPP_IP; 1352 } 1353 #endif /* VJC */ 1354 1355 /* 1356 * If the packet will fit in a header mbuf, don't waste a 1357 * whole cluster on it. 1358 */ 1359 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1360 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1361 if (mp != NULL) { 1362 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1363 m_freem(m); 1364 m = mp; 1365 m->m_len = ilen; 1366 } 1367 } 1368 m->m_pkthdr.len = ilen; 1369 m->m_pkthdr.rcvif = ifp; 1370 1371 if ((proto & 0x8000) == 0) { 1372 #ifdef PPP_FILTER 1373 /* 1374 * See whether we want to pass this packet, and 1375 * if it counts as link activity. 1376 */ 1377 adrs = *mtod(m, u_char *); /* save address field */ 1378 *mtod(m, u_char *) = 0; /* indicate inbound */ 1379 if (sc->sc_pass_filt.bf_insns != 0 1380 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1381 ilen, 0) == 0) { 1382 /* drop this packet */ 1383 m_freem(m); 1384 return; 1385 } 1386 if (sc->sc_active_filt.bf_insns == 0 1387 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1388 sc->sc_last_recv = time.tv_sec; 1389 1390 *mtod(m, u_char *) = adrs; 1391 #else 1392 /* 1393 * Record the time that we received this packet. 1394 */ 1395 sc->sc_last_recv = time.tv_sec; 1396 #endif /* PPP_FILTER */ 1397 } 1398 1399 #if NBPFILTER > 0 1400 /* See if bpf wants to look at the packet. */ 1401 if (sc->sc_bpf) 1402 bpf_mtap(sc->sc_bpf, m); 1403 #endif 1404 1405 rv = 0; 1406 switch (proto) { 1407 #ifdef INET 1408 case PPP_IP: 1409 /* 1410 * IP packet - take off the ppp header and pass it up to IP. 1411 */ 1412 if ((ifp->if_flags & IFF_UP) == 0 1413 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1414 /* interface is down - drop the packet. */ 1415 m_freem(m); 1416 return; 1417 } 1418 m->m_pkthdr.len -= PPP_HDRLEN; 1419 m->m_data += PPP_HDRLEN; 1420 m->m_len -= PPP_HDRLEN; 1421 schednetisr(NETISR_IP); 1422 inq = &ipintrq; 1423 break; 1424 #endif 1425 1426 default: 1427 /* 1428 * Some other protocol - place on input queue for read(). 1429 */ 1430 inq = &sc->sc_inq; 1431 rv = 1; 1432 break; 1433 } 1434 1435 /* 1436 * Put the packet on the appropriate input queue. 1437 */ 1438 s = splimp(); 1439 if (IF_QFULL(inq)) { 1440 IF_DROP(inq); 1441 splx(s); 1442 if (sc->sc_flags & SC_DEBUG) 1443 printf("%s: input queue full\n", ifp->if_xname); 1444 ifp->if_iqdrops++; 1445 goto bad; 1446 } 1447 IF_ENQUEUE(inq, m); 1448 splx(s); 1449 ifp->if_ipackets++; 1450 ifp->if_ibytes += ilen; 1451 ifp->if_lastchange = time; 1452 1453 if (rv) 1454 (*sc->sc_ctlp)(sc); 1455 1456 return; 1457 1458 bad: 1459 m_freem(m); 1460 sc->sc_if.if_ierrors++; 1461 sc->sc_stats.ppp_ierrors++; 1462 } 1463 1464 #define MAX_DUMP_BYTES 128 1465 1466 static void 1467 pppdumpm(m0) 1468 struct mbuf *m0; 1469 { 1470 char buf[3*MAX_DUMP_BYTES+4]; 1471 char *bp = buf; 1472 struct mbuf *m; 1473 static char digits[] = "0123456789abcdef"; 1474 1475 for (m = m0; m; m = m->m_next) { 1476 int l = m->m_len; 1477 u_char *rptr = (u_char *)m->m_data; 1478 1479 while (l--) { 1480 if (bp > buf + sizeof(buf) - 4) 1481 goto done; 1482 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1483 *bp++ = digits[*rptr++ & 0xf]; 1484 } 1485 1486 if (m->m_next) { 1487 if (bp > buf + sizeof(buf) - 3) 1488 goto done; 1489 *bp++ = '|'; 1490 } else 1491 *bp++ = ' '; 1492 } 1493 done: 1494 if (m) 1495 *bp++ = '>'; 1496 *bp = 0; 1497 printf("%s\n", buf); 1498 } 1499 1500 #endif /* NPPP > 0 */ 1501
Indexes created Tue Sep 23 14:10:03 GMT 2025