if_ppp.c revision 1.34
1 /* $NetBSD: if_ppp.c,v 1.34 1996/10/10 22:59:48 christos Exp $ */ 2 3 /* 4 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. 5 * 6 * Copyright (c) 1989 Carnegie Mellon University. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms are permitted 10 * provided that the above copyright notice and this paragraph are 11 * duplicated in all such forms and that any documentation, 12 * advertising materials, and other materials related to such 13 * distribution and use acknowledge that the software was developed 14 * by Carnegie Mellon University. The name of the 15 * University may not be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 19 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Drew D. Perkins 22 * Carnegie Mellon University 23 * 4910 Forbes Ave. 24 * Pittsburgh, PA 15213 25 * (412) 268-8576 26 * ddp (at) andrew.cmu.edu 27 * 28 * Based on: 29 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 30 * 31 * Copyright (c) 1987 Regents of the University of California. 32 * All rights reserved. 33 * 34 * Redistribution and use in source and binary forms are permitted 35 * provided that the above copyright notice and this paragraph are 36 * duplicated in all such forms and that any documentation, 37 * advertising materials, and other materials related to such 38 * distribution and use acknowledge that the software was developed 39 * by the University of California, Berkeley. The name of the 40 * University may not be used to endorse or promote products derived 41 * from this software without specific prior written permission. 42 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 43 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 44 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 45 * 46 * Serial Line interface 47 * 48 * Rick Adams 49 * Center for Seismic Studies 50 * 1300 N 17th Street, Suite 1450 51 * Arlington, Virginia 22209 52 * (703)276-7900 53 * rick (at) seismo.ARPA 54 * seismo!rick 55 * 56 * Pounded on heavily by Chris Torek (chris (at) mimsy.umd.edu, umcp-cs!chris). 57 * Converted to 4.3BSD Beta by Chris Torek. 58 * Other changes made at Berkeley, based in part on code by Kirk Smith. 59 * 60 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad (at) cayman.com) 61 * Added VJ tcp header compression; more unified ioctls 62 * 63 * Extensively modified by Paul Mackerras (paulus (at) cs.anu.edu.au). 64 * Cleaned up a lot of the mbuf-related code to fix bugs that 65 * caused system crashes and packet corruption. Changed pppstart 66 * so that it doesn't just give up with a collision if the whole 67 * packet doesn't fit in the output ring buffer. 68 * 69 * Added priority queueing for interactive IP packets, following 70 * the model of if_sl.c, plus hooks for bpf. 71 * Paul Mackerras (paulus (at) cs.anu.edu.au). 72 */ 73 74 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 75 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 76 77 #include "ppp.h" 78 #if NPPP > 0 79 80 #define VJC 81 #define PPP_COMPRESS 82 83 #include <sys/param.h> 84 #include <sys/proc.h> 85 #include <sys/mbuf.h> 86 #include <sys/socket.h> 87 #include <sys/ioctl.h> 88 #include <sys/kernel.h> 89 #include <sys/systm.h> 90 #include <sys/time.h> 91 #include <sys/malloc.h> 92 93 #include <net/if.h> 94 #include <net/if_types.h> 95 #include <net/netisr.h> 96 #include <net/route.h> 97 #include <net/bpf.h> 98 99 #if INET 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #include <netinet/in_var.h> 103 #include <netinet/ip.h> 104 #endif 105 106 #include "bpfilter.h" 107 #if NBPFILTER > 0 108 #include <sys/time.h> 109 #include <net/bpf.h> 110 #endif 111 112 #ifdef VJC 113 #include <net/slcompress.h> 114 #endif 115 116 #include <net/ppp_defs.h> 117 #include <net/if_ppp.h> 118 #include <net/if_pppvar.h> 119 #include <machine/cpu.h> 120 121 #ifdef PPP_COMPRESS 122 #define PACKETPTR struct mbuf * 123 #include <net/ppp-comp.h> 124 #endif 125 126 static void ppp_requeue __P((struct ppp_softc *)); 127 static void ppp_outpkt __P((struct ppp_softc *)); 128 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 129 static void ppp_ccp_closed __P((struct ppp_softc *)); 130 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 131 static void pppdumpm __P((struct mbuf *m0)); 132 133 /* 134 * Some useful mbuf macros not in mbuf.h. 135 */ 136 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 137 138 #define M_DATASTART(m) \ 139 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 140 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 141 142 #define M_DATASIZE(m) \ 143 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 144 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 145 146 /* 147 * We steal two bits in the mbuf m_flags, to mark high-priority packets 148 * for output, and received packets following lost/corrupted packets. 149 */ 150 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 151 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 152 153 154 #ifdef PPP_COMPRESS 155 /* 156 * List of compressors we know about. 157 * We leave some space so maybe we can modload compressors. 158 */ 159 160 extern struct compressor ppp_bsd_compress; 161 extern struct compressor ppp_deflate; 162 163 struct compressor *ppp_compressors[8] = { 164 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 165 &ppp_bsd_compress, 166 #endif 167 #if DO_DEFLATE && defined(PPP_DEFLATE) 168 &ppp_deflate, 169 #endif 170 NULL 171 }; 172 #endif /* PPP_COMPRESS */ 173 174 /* 175 * Called from boot code to establish ppp interfaces. 176 */ 177 void 178 pppattach() 179 { 180 register struct ppp_softc *sc; 181 register int i = 0; 182 183 for (sc = ppp_softc; i < NPPP; sc++) { 184 sc->sc_unit = i; /* XXX */ 185 ksprintf(sc->sc_if.if_xname, "ppp%d", i++); 186 sc->sc_if.if_softc = sc; 187 sc->sc_if.if_mtu = PPP_MTU; 188 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 189 sc->sc_if.if_type = IFT_PPP; 190 sc->sc_if.if_hdrlen = PPP_HDRLEN; 191 sc->sc_if.if_ioctl = pppsioctl; 192 sc->sc_if.if_output = pppoutput; 193 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 194 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 195 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 196 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 197 if_attach(&sc->sc_if); 198 #if NBPFILTER > 0 199 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); 200 #endif 201 } 202 } 203 204 /* 205 * Allocate a ppp interface unit and initialize it. 206 */ 207 struct ppp_softc * 208 pppalloc(pid) 209 pid_t pid; 210 { 211 int nppp, i; 212 struct ppp_softc *sc; 213 214 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 215 if (sc->sc_xfer == pid) { 216 sc->sc_xfer = 0; 217 return sc; 218 } 219 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 220 if (sc->sc_devp == NULL) 221 break; 222 if (nppp >= NPPP) 223 return NULL; 224 225 sc->sc_flags = 0; 226 sc->sc_mru = PPP_MRU; 227 sc->sc_relinq = NULL; 228 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 229 #ifdef VJC 230 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 231 M_DEVBUF, M_NOWAIT); 232 if (sc->sc_comp) 233 sl_compress_init(sc->sc_comp, -1); 234 #endif 235 #ifdef PPP_COMPRESS 236 sc->sc_xc_state = NULL; 237 sc->sc_rc_state = NULL; 238 #endif /* PPP_COMPRESS */ 239 for (i = 0; i < NUM_NP; ++i) 240 sc->sc_npmode[i] = NPMODE_ERROR; 241 sc->sc_npqueue = NULL; 242 sc->sc_npqtail = &sc->sc_npqueue; 243 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 244 245 return sc; 246 } 247 248 /* 249 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 250 */ 251 void 252 pppdealloc(sc) 253 struct ppp_softc *sc; 254 { 255 struct mbuf *m; 256 257 if_down(&sc->sc_if); 258 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 259 sc->sc_devp = NULL; 260 sc->sc_xfer = 0; 261 for (;;) { 262 IF_DEQUEUE(&sc->sc_rawq, m); 263 if (m == NULL) 264 break; 265 m_freem(m); 266 } 267 for (;;) { 268 IF_DEQUEUE(&sc->sc_inq, m); 269 if (m == NULL) 270 break; 271 m_freem(m); 272 } 273 for (;;) { 274 IF_DEQUEUE(&sc->sc_fastq, m); 275 if (m == NULL) 276 break; 277 m_freem(m); 278 } 279 while ((m = sc->sc_npqueue) != NULL) { 280 sc->sc_npqueue = m->m_nextpkt; 281 m_freem(m); 282 } 283 if (sc->sc_togo != NULL) { 284 m_freem(sc->sc_togo); 285 sc->sc_togo = NULL; 286 } 287 #ifdef PPP_COMPRESS 288 ppp_ccp_closed(sc); 289 sc->sc_xc_state = NULL; 290 sc->sc_rc_state = NULL; 291 #endif /* PPP_COMPRESS */ 292 if (sc->sc_pass_filt.bf_insns != 0) { 293 FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); 294 sc->sc_pass_filt.bf_insns = 0; 295 sc->sc_pass_filt.bf_len = 0; 296 } 297 if (sc->sc_active_filt.bf_insns != 0) { 298 FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); 299 sc->sc_active_filt.bf_insns = 0; 300 sc->sc_active_filt.bf_len = 0; 301 } 302 #ifdef VJC 303 if (sc->sc_comp != 0) { 304 FREE(sc->sc_comp, M_DEVBUF); 305 sc->sc_comp = 0; 306 } 307 #endif 308 } 309 310 /* 311 * Ioctl routine for generic ppp devices. 312 */ 313 int 314 pppioctl(sc, cmd, data, flag, p) 315 struct ppp_softc *sc; 316 u_long cmd; 317 caddr_t data; 318 int flag; 319 struct proc *p; 320 { 321 int s, error, flags, mru, nb, npx; 322 struct ppp_option_data *odp; 323 struct compressor **cp; 324 struct npioctl *npi; 325 time_t t; 326 struct bpf_program *bp, *nbp; 327 struct bpf_insn *newcode, *oldcode; 328 int newcodelen; 329 #ifdef PPP_COMPRESS 330 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 331 #endif 332 333 switch (cmd) { 334 case FIONREAD: 335 *(int *)data = sc->sc_inq.ifq_len; 336 break; 337 338 case PPPIOCGUNIT: 339 *(int *)data = sc->sc_unit; /* XXX */ 340 break; 341 342 case PPPIOCGFLAGS: 343 *(u_int *)data = sc->sc_flags; 344 break; 345 346 case PPPIOCSFLAGS: 347 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 348 return (error); 349 flags = *(int *)data & SC_MASK; 350 s = splsoftnet(); 351 #ifdef PPP_COMPRESS 352 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 353 ppp_ccp_closed(sc); 354 #endif 355 splhigh(); 356 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 357 splx(s); 358 break; 359 360 case PPPIOCSMRU: 361 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 362 return (error); 363 mru = *(int *)data; 364 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 365 sc->sc_mru = mru; 366 break; 367 368 case PPPIOCGMRU: 369 *(int *)data = sc->sc_mru; 370 break; 371 372 #ifdef VJC 373 case PPPIOCSMAXCID: 374 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 375 return (error); 376 if (sc->sc_comp) { 377 s = splsoftnet(); 378 sl_compress_init(sc->sc_comp, *(int *)data); 379 splx(s); 380 } 381 break; 382 #endif 383 384 case PPPIOCXFERUNIT: 385 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 386 return (error); 387 sc->sc_xfer = p->p_pid; 388 break; 389 390 #ifdef PPP_COMPRESS 391 case PPPIOCSCOMPRESS: 392 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 393 return (error); 394 odp = (struct ppp_option_data *) data; 395 nb = odp->length; 396 if (nb > sizeof(ccp_option)) 397 nb = sizeof(ccp_option); 398 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 399 return (error); 400 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 401 return (EINVAL); 402 for (cp = ppp_compressors; *cp != NULL; ++cp) 403 if ((*cp)->compress_proto == ccp_option[0]) { 404 /* 405 * Found a handler for the protocol - try to allocate 406 * a compressor or decompressor. 407 */ 408 error = 0; 409 if (odp->transmit) { 410 s = splsoftnet(); 411 if (sc->sc_xc_state != NULL) 412 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 413 sc->sc_xcomp = *cp; 414 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 415 if (sc->sc_xc_state == NULL) { 416 if (sc->sc_flags & SC_DEBUG) 417 kprintf("%s: comp_alloc failed\n", 418 sc->sc_if.if_xname); 419 error = ENOBUFS; 420 } 421 splhigh(); 422 sc->sc_flags &= ~SC_COMP_RUN; 423 splx(s); 424 } else { 425 s = splsoftnet(); 426 if (sc->sc_rc_state != NULL) 427 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 428 sc->sc_rcomp = *cp; 429 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 430 if (sc->sc_rc_state == NULL) { 431 if (sc->sc_flags & SC_DEBUG) 432 kprintf("%s: decomp_alloc failed\n", 433 sc->sc_if.if_xname); 434 error = ENOBUFS; 435 } 436 splhigh(); 437 sc->sc_flags &= ~SC_DECOMP_RUN; 438 splx(s); 439 } 440 return (error); 441 } 442 if (sc->sc_flags & SC_DEBUG) 443 kprintf("%s: no compressor for [%x %x %x], %x\n", 444 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 445 ccp_option[2], nb); 446 return (EINVAL); /* no handler found */ 447 #endif /* PPP_COMPRESS */ 448 449 case PPPIOCGNPMODE: 450 case PPPIOCSNPMODE: 451 npi = (struct npioctl *) data; 452 switch (npi->protocol) { 453 case PPP_IP: 454 npx = NP_IP; 455 break; 456 default: 457 return EINVAL; 458 } 459 if (cmd == PPPIOCGNPMODE) { 460 npi->mode = sc->sc_npmode[npx]; 461 } else { 462 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 463 return (error); 464 if (npi->mode != sc->sc_npmode[npx]) { 465 s = splsoftnet(); 466 sc->sc_npmode[npx] = npi->mode; 467 if (npi->mode != NPMODE_QUEUE) { 468 ppp_requeue(sc); 469 (*sc->sc_start)(sc); 470 } 471 splx(s); 472 } 473 } 474 break; 475 476 case PPPIOCGIDLE: 477 s = splsoftnet(); 478 t = time.tv_sec; 479 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 480 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 481 splx(s); 482 break; 483 484 case PPPIOCSPASS: 485 case PPPIOCSACTIVE: 486 nbp = (struct bpf_program *) data; 487 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 488 return EINVAL; 489 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 490 if (newcodelen != 0) { 491 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 492 if (newcode == 0) { 493 return EINVAL; /* or sumpin */ 494 } 495 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 496 newcodelen)) != 0) { 497 FREE(newcode, M_DEVBUF); 498 return error; 499 } 500 if (!bpf_validate(newcode, nbp->bf_len)) { 501 FREE(newcode, M_DEVBUF); 502 return EINVAL; 503 } 504 } else 505 newcode = 0; 506 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 507 oldcode = bp->bf_insns; 508 s = splimp(); 509 bp->bf_len = nbp->bf_len; 510 bp->bf_insns = newcode; 511 splx(s); 512 if (oldcode != 0) 513 FREE(oldcode, M_DEVBUF); 514 break; 515 516 default: 517 return (-1); 518 } 519 return (0); 520 } 521 522 /* 523 * Process an ioctl request to the ppp network interface. 524 */ 525 int 526 pppsioctl(ifp, cmd, data) 527 register struct ifnet *ifp; 528 u_long cmd; 529 caddr_t data; 530 { 531 register struct ppp_softc *sc = ifp->if_softc; 532 register struct ifaddr *ifa = (struct ifaddr *)data; 533 register struct ifreq *ifr = (struct ifreq *)data; 534 struct ppp_stats *psp; 535 #ifdef PPP_COMPRESS 536 struct ppp_comp_stats *pcp; 537 #endif 538 int s = splimp(), error = 0; 539 540 switch (cmd) { 541 case SIOCSIFFLAGS: 542 if ((ifp->if_flags & IFF_RUNNING) == 0) 543 ifp->if_flags &= ~IFF_UP; 544 break; 545 546 case SIOCSIFADDR: 547 if (ifa->ifa_addr->sa_family != AF_INET) 548 error = EAFNOSUPPORT; 549 break; 550 551 case SIOCSIFDSTADDR: 552 if (ifa->ifa_addr->sa_family != AF_INET) 553 error = EAFNOSUPPORT; 554 break; 555 556 case SIOCSIFMTU: 557 sc->sc_if.if_mtu = ifr->ifr_mtu; 558 break; 559 560 case SIOCADDMULTI: 561 case SIOCDELMULTI: 562 if (ifr == 0) { 563 error = EAFNOSUPPORT; 564 break; 565 } 566 switch(ifr->ifr_addr.sa_family) { 567 #ifdef INET 568 case AF_INET: 569 break; 570 #endif 571 default: 572 error = EAFNOSUPPORT; 573 break; 574 } 575 break; 576 577 case SIOCGPPPSTATS: 578 psp = &((struct ifpppstatsreq *) data)->stats; 579 bzero(psp, sizeof(*psp)); 580 psp->p = sc->sc_stats; 581 #if defined(VJC) && !defined(SL_NO_STATS) 582 if (sc->sc_comp) { 583 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 584 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 585 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 586 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 587 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 588 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 589 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 590 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 591 } 592 #endif /* VJC */ 593 break; 594 595 #ifdef PPP_COMPRESS 596 case SIOCGPPPCSTATS: 597 pcp = &((struct ifpppcstatsreq *) data)->stats; 598 bzero(pcp, sizeof(*pcp)); 599 if (sc->sc_xc_state != NULL) 600 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 601 if (sc->sc_rc_state != NULL) 602 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 603 break; 604 #endif /* PPP_COMPRESS */ 605 606 default: 607 error = EINVAL; 608 } 609 splx(s); 610 return (error); 611 } 612 613 /* 614 * Queue a packet. Start transmission if not active. 615 * Packet is placed in Information field of PPP frame. 616 */ 617 int 618 pppoutput(ifp, m0, dst, rtp) 619 struct ifnet *ifp; 620 struct mbuf *m0; 621 struct sockaddr *dst; 622 struct rtentry *rtp; 623 { 624 register struct ppp_softc *sc = ifp->if_softc; 625 int protocol, address, control; 626 u_char *cp; 627 int s, error; 628 struct ip *ip; 629 struct ifqueue *ifq; 630 enum NPmode mode; 631 int active, len; 632 struct mbuf *m; 633 634 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 635 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 636 error = ENETDOWN; /* sort of */ 637 goto bad; 638 } 639 640 /* 641 * Compute PPP header. 642 */ 643 m0->m_flags &= ~M_HIGHPRI; 644 switch (dst->sa_family) { 645 #ifdef INET 646 case AF_INET: 647 address = PPP_ALLSTATIONS; 648 control = PPP_UI; 649 protocol = PPP_IP; 650 mode = sc->sc_npmode[NP_IP]; 651 652 /* 653 * If this packet has the "low delay" bit set in the IP header, 654 * put it on the fastq instead. 655 */ 656 ip = mtod(m0, struct ip *); 657 if (ip->ip_tos & IPTOS_LOWDELAY) 658 m0->m_flags |= M_HIGHPRI; 659 break; 660 #endif 661 case AF_UNSPEC: 662 address = PPP_ADDRESS(dst->sa_data); 663 control = PPP_CONTROL(dst->sa_data); 664 protocol = PPP_PROTOCOL(dst->sa_data); 665 mode = NPMODE_PASS; 666 break; 667 default: 668 kprintf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 669 error = EAFNOSUPPORT; 670 goto bad; 671 } 672 673 /* 674 * Drop this packet, or return an error, if necessary. 675 */ 676 if (mode == NPMODE_ERROR) { 677 error = ENETDOWN; 678 goto bad; 679 } 680 if (mode == NPMODE_DROP) { 681 error = 0; 682 goto bad; 683 } 684 685 /* 686 * Add PPP header. If no space in first mbuf, allocate another. 687 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 688 */ 689 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 690 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 691 if (m0 == 0) { 692 error = ENOBUFS; 693 goto bad; 694 } 695 m0->m_len = 0; 696 } else 697 m0->m_data -= PPP_HDRLEN; 698 699 cp = mtod(m0, u_char *); 700 *cp++ = address; 701 *cp++ = control; 702 *cp++ = protocol >> 8; 703 *cp++ = protocol & 0xff; 704 m0->m_len += PPP_HDRLEN; 705 706 len = 0; 707 for (m = m0; m != 0; m = m->m_next) 708 len += m->m_len; 709 710 if (sc->sc_flags & SC_LOG_OUTPKT) { 711 kprintf("%s output: ", ifp->if_xname); 712 pppdumpm(m0); 713 } 714 715 /* 716 * Apply the pass and active filters to the packet, 717 * but only if it is a data packet. 718 */ 719 active = 0; 720 if ((protocol & 0x8000) == 0) { 721 *mtod(m0, u_char *) = 1; /* indicates outbound */ 722 if (sc->sc_pass_filt.bf_insns != 0 723 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 724 len, 0) == 0) { 725 error = 0; /* drop this packet */ 726 goto bad; 727 } 728 729 /* 730 * Update the time we sent the most recent packet. 731 */ 732 if (sc->sc_active_filt.bf_insns == 0 733 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 734 sc->sc_last_sent = time.tv_sec; 735 736 *mtod(m0, u_char *) = address; 737 } 738 739 #if NBPFILTER > 0 740 /* 741 * See if bpf wants to look at the packet. 742 */ 743 if (sc->sc_bpf) 744 bpf_mtap(sc->sc_bpf, m0); 745 #endif 746 747 /* 748 * Put the packet on the appropriate queue. 749 */ 750 s = splsoftnet(); 751 if (mode == NPMODE_QUEUE) { 752 /* XXX we should limit the number of packets on this queue */ 753 *sc->sc_npqtail = m0; 754 m0->m_nextpkt = NULL; 755 sc->sc_npqtail = &m0->m_nextpkt; 756 } else { 757 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 758 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 759 IF_DROP(ifq); 760 splx(s); 761 sc->sc_if.if_oerrors++; 762 sc->sc_stats.ppp_oerrors++; 763 error = ENOBUFS; 764 goto bad; 765 } 766 IF_ENQUEUE(ifq, m0); 767 (*sc->sc_start)(sc); 768 } 769 ifp->if_lastchange = time; 770 ifp->if_opackets++; 771 ifp->if_obytes += len; 772 773 splx(s); 774 return (0); 775 776 bad: 777 m_freem(m0); 778 return (error); 779 } 780 781 /* 782 * After a change in the NPmode for some NP, move packets from the 783 * npqueue to the send queue or the fast queue as appropriate. 784 * Should be called at splsoftnet. 785 */ 786 static void 787 ppp_requeue(sc) 788 struct ppp_softc *sc; 789 { 790 struct mbuf *m, **mpp; 791 struct ifqueue *ifq; 792 enum NPmode mode; 793 794 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 795 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 796 case PPP_IP: 797 mode = sc->sc_npmode[NP_IP]; 798 break; 799 default: 800 mode = NPMODE_PASS; 801 } 802 803 switch (mode) { 804 case NPMODE_PASS: 805 /* 806 * This packet can now go on one of the queues to be sent. 807 */ 808 *mpp = m->m_nextpkt; 809 m->m_nextpkt = NULL; 810 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 811 if (IF_QFULL(ifq)) { 812 IF_DROP(ifq); 813 sc->sc_if.if_oerrors++; 814 sc->sc_stats.ppp_oerrors++; 815 } else 816 IF_ENQUEUE(ifq, m); 817 break; 818 819 case NPMODE_DROP: 820 case NPMODE_ERROR: 821 *mpp = m->m_nextpkt; 822 m_freem(m); 823 break; 824 825 case NPMODE_QUEUE: 826 mpp = &m->m_nextpkt; 827 break; 828 } 829 } 830 sc->sc_npqtail = mpp; 831 } 832 833 /* 834 * Get a packet to send. This procedure is intended to be called at 835 * spltty or splimp, so it takes little time. If there isn't a packet 836 * waiting to go out, it schedules a software interrupt to prepare a 837 * new packet; the device start routine gets called again when a 838 * packet is ready. 839 */ 840 struct mbuf * 841 ppp_dequeue(sc) 842 struct ppp_softc *sc; 843 { 844 struct mbuf *m; 845 int s = splhigh(); 846 847 m = sc->sc_togo; 848 if (m) { 849 /* 850 * Had a packet waiting - send it. 851 */ 852 sc->sc_togo = NULL; 853 sc->sc_flags |= SC_TBUSY; 854 splx(s); 855 return m; 856 } 857 /* 858 * Remember we wanted a packet and schedule a software interrupt. 859 */ 860 sc->sc_flags &= ~SC_TBUSY; 861 schednetisr(NETISR_PPP); 862 splx(s); 863 return NULL; 864 } 865 866 /* 867 * Software interrupt routine, called at splsoftnet. 868 */ 869 void 870 pppintr() 871 { 872 struct ppp_softc *sc; 873 int i, s; 874 struct mbuf *m; 875 876 sc = ppp_softc; 877 for (i = 0; i < NPPP; ++i, ++sc) { 878 if (!(sc->sc_flags & SC_TBUSY) && sc->sc_togo == NULL 879 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) 880 ppp_outpkt(sc); 881 for (;;) { 882 s = splhigh(); 883 IF_DEQUEUE(&sc->sc_rawq, m); 884 splx(s); 885 if (m == NULL) 886 break; 887 ppp_inproc(sc, m); 888 } 889 } 890 } 891 892 /* 893 * Grab another packet off a queue and apply VJ compression, 894 * packet compression, address/control and/or protocol compression 895 * if enabled. Should be called at splsoftnet. 896 */ 897 static void 898 ppp_outpkt(sc) 899 struct ppp_softc *sc; 900 { 901 struct mbuf *m, *mp; 902 u_char *cp; 903 int address, control, protocol; 904 905 /* 906 * Grab a packet to send: first try the fast queue, then the 907 * normal queue. 908 */ 909 IF_DEQUEUE(&sc->sc_fastq, m); 910 if (m == NULL) 911 IF_DEQUEUE(&sc->sc_if.if_snd, m); 912 if (m == NULL) 913 return; 914 915 ++sc->sc_stats.ppp_opackets; 916 917 /* 918 * Extract the ppp header of the new packet. 919 * The ppp header will be in one mbuf. 920 */ 921 cp = mtod(m, u_char *); 922 address = PPP_ADDRESS(cp); 923 control = PPP_CONTROL(cp); 924 protocol = PPP_PROTOCOL(cp); 925 926 switch (protocol) { 927 case PPP_IP: 928 #ifdef VJC 929 /* 930 * If the packet is a TCP/IP packet, see if we can compress it. 931 */ 932 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 933 struct ip *ip; 934 int type; 935 936 mp = m; 937 ip = (struct ip *) (cp + PPP_HDRLEN); 938 if (mp->m_len <= PPP_HDRLEN) { 939 mp = mp->m_next; 940 if (mp == NULL) 941 break; 942 ip = mtod(mp, struct ip *); 943 } 944 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 945 if (ip->ip_p == IPPROTO_TCP) { 946 type = sl_compress_tcp(mp, ip, sc->sc_comp, 947 !(sc->sc_flags & SC_NO_TCP_CCID)); 948 switch (type) { 949 case TYPE_UNCOMPRESSED_TCP: 950 protocol = PPP_VJC_UNCOMP; 951 break; 952 case TYPE_COMPRESSED_TCP: 953 protocol = PPP_VJC_COMP; 954 cp = mtod(m, u_char *); 955 cp[0] = address; /* header has moved */ 956 cp[1] = control; 957 cp[2] = 0; 958 break; 959 } 960 cp[3] = protocol; /* update protocol in PPP header */ 961 } 962 } 963 #endif /* VJC */ 964 break; 965 966 #ifdef PPP_COMPRESS 967 case PPP_CCP: 968 ppp_ccp(sc, m, 0); 969 break; 970 #endif /* PPP_COMPRESS */ 971 } 972 973 #ifdef PPP_COMPRESS 974 if (protocol != PPP_LCP && protocol != PPP_CCP 975 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 976 struct mbuf *mcomp = NULL; 977 int slen, clen; 978 979 slen = 0; 980 for (mp = m; mp != NULL; mp = mp->m_next) 981 slen += mp->m_len; 982 clen = (*sc->sc_xcomp->compress) 983 (sc->sc_xc_state, &mcomp, m, slen, 984 (sc->sc_flags & SC_CCP_UP? sc->sc_if.if_mtu: 0)); 985 if (mcomp != NULL) { 986 m_freem(m); 987 m = mcomp; 988 cp = mtod(m, u_char *); 989 protocol = cp[3]; 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 sc->sc_togo = m; 1015 (*sc->sc_start)(sc); 1016 } 1017 1018 #ifdef PPP_COMPRESS 1019 /* 1020 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1021 * 0 if it is about to be transmitted. 1022 */ 1023 static void 1024 ppp_ccp(sc, m, rcvd) 1025 struct ppp_softc *sc; 1026 struct mbuf *m; 1027 int rcvd; 1028 { 1029 u_char *dp, *ep; 1030 struct mbuf *mp; 1031 int slen, s; 1032 1033 /* 1034 * Get a pointer to the data after the PPP header. 1035 */ 1036 if (m->m_len <= PPP_HDRLEN) { 1037 mp = m->m_next; 1038 if (mp == NULL) 1039 return; 1040 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1041 } else { 1042 mp = m; 1043 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1044 } 1045 1046 ep = mtod(mp, u_char *) + mp->m_len; 1047 if (dp + CCP_HDRLEN > ep) 1048 return; 1049 slen = CCP_LENGTH(dp); 1050 if (dp + slen > ep) { 1051 if (sc->sc_flags & SC_DEBUG) 1052 kprintf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1053 dp, slen, mtod(mp, u_char *), mp->m_len); 1054 return; 1055 } 1056 1057 switch (CCP_CODE(dp)) { 1058 case CCP_CONFREQ: 1059 case CCP_TERMREQ: 1060 case CCP_TERMACK: 1061 /* CCP must be going down - disable compression */ 1062 if (sc->sc_flags & SC_CCP_UP) { 1063 s = splhigh(); 1064 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1065 splx(s); 1066 } 1067 break; 1068 1069 case CCP_CONFACK: 1070 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1071 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1072 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1073 if (!rcvd) { 1074 /* we're agreeing to send compressed packets. */ 1075 if (sc->sc_xc_state != NULL 1076 && (*sc->sc_xcomp->comp_init) 1077 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1078 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1079 s = splhigh(); 1080 sc->sc_flags |= SC_COMP_RUN; 1081 splx(s); 1082 } 1083 } else { 1084 /* peer is agreeing to send compressed packets. */ 1085 if (sc->sc_rc_state != NULL 1086 && (*sc->sc_rcomp->decomp_init) 1087 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1088 sc->sc_unit, 0, sc->sc_mru, 1089 sc->sc_flags & SC_DEBUG)) { 1090 s = splhigh(); 1091 sc->sc_flags |= SC_DECOMP_RUN; 1092 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1093 splx(s); 1094 } 1095 } 1096 } 1097 break; 1098 1099 case CCP_RESETACK: 1100 if (sc->sc_flags & SC_CCP_UP) { 1101 if (!rcvd) { 1102 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1103 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1104 } else { 1105 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1106 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1107 s = splhigh(); 1108 sc->sc_flags &= ~SC_DC_ERROR; 1109 splx(s); 1110 } 1111 } 1112 } 1113 break; 1114 } 1115 } 1116 1117 /* 1118 * CCP is down; free (de)compressor state if necessary. 1119 */ 1120 static void 1121 ppp_ccp_closed(sc) 1122 struct ppp_softc *sc; 1123 { 1124 if (sc->sc_xc_state) { 1125 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1126 sc->sc_xc_state = NULL; 1127 } 1128 if (sc->sc_rc_state) { 1129 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1130 sc->sc_rc_state = NULL; 1131 } 1132 } 1133 #endif /* PPP_COMPRESS */ 1134 1135 /* 1136 * PPP packet input routine. 1137 * The caller has checked and removed the FCS and has inserted 1138 * the address/control bytes and the protocol high byte if they 1139 * were omitted. 1140 */ 1141 void 1142 ppppktin(sc, m, lost) 1143 struct ppp_softc *sc; 1144 struct mbuf *m; 1145 int lost; 1146 { 1147 int s = splhigh(); 1148 1149 if (lost) 1150 m->m_flags |= M_ERRMARK; 1151 IF_ENQUEUE(&sc->sc_rawq, m); 1152 schednetisr(NETISR_PPP); 1153 splx(s); 1154 } 1155 1156 /* 1157 * Process a received PPP packet, doing decompression as necessary. 1158 * Should be called at splsoftnet. 1159 */ 1160 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1161 TYPE_UNCOMPRESSED_TCP) 1162 1163 static void 1164 ppp_inproc(sc, m) 1165 struct ppp_softc *sc; 1166 struct mbuf *m; 1167 { 1168 struct ifnet *ifp = &sc->sc_if; 1169 struct ifqueue *inq; 1170 int s, ilen, xlen, proto, rv; 1171 u_char *cp, adrs, ctrl; 1172 struct mbuf *mp, *dmp = NULL; 1173 u_char *iphdr; 1174 u_int hlen; 1175 1176 sc->sc_stats.ppp_ipackets++; 1177 1178 if (sc->sc_flags & SC_LOG_INPKT) { 1179 ilen = 0; 1180 for (mp = m; mp != NULL; mp = mp->m_next) 1181 ilen += mp->m_len; 1182 kprintf("%s: got %d bytes\n", ifp->if_xname, ilen); 1183 pppdumpm(m); 1184 } 1185 1186 cp = mtod(m, u_char *); 1187 adrs = PPP_ADDRESS(cp); 1188 ctrl = PPP_CONTROL(cp); 1189 proto = PPP_PROTOCOL(cp); 1190 1191 if (m->m_flags & M_ERRMARK) { 1192 m->m_flags &= ~M_ERRMARK; 1193 s = splhigh(); 1194 sc->sc_flags |= SC_VJ_RESET; 1195 splx(s); 1196 } 1197 1198 #ifdef PPP_COMPRESS 1199 /* 1200 * Decompress this packet if necessary, update the receiver's 1201 * dictionary, or take appropriate action on a CCP packet. 1202 */ 1203 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1204 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1205 /* decompress this packet */ 1206 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1207 if (rv == DECOMP_OK) { 1208 m_freem(m); 1209 if (dmp == NULL) { 1210 /* no error, but no decompressed packet produced */ 1211 return; 1212 } 1213 m = dmp; 1214 cp = mtod(m, u_char *); 1215 proto = PPP_PROTOCOL(cp); 1216 1217 } else { 1218 /* 1219 * An error has occurred in decompression. 1220 * Pass the compressed packet up to pppd, which may take 1221 * CCP down or issue a Reset-Req. 1222 */ 1223 if (sc->sc_flags & SC_DEBUG) 1224 kprintf("%s: decompress failed %d\n", ifp->if_xname, rv); 1225 s = splhigh(); 1226 sc->sc_flags |= SC_VJ_RESET; 1227 if (rv == DECOMP_ERROR) 1228 sc->sc_flags |= SC_DC_ERROR; 1229 else 1230 sc->sc_flags |= SC_DC_FERROR; 1231 splx(s); 1232 } 1233 1234 } else { 1235 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1236 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1237 } 1238 if (proto == PPP_CCP) { 1239 ppp_ccp(sc, m, 1); 1240 } 1241 } 1242 #endif 1243 1244 ilen = 0; 1245 for (mp = m; mp != NULL; mp = mp->m_next) 1246 ilen += mp->m_len; 1247 1248 #ifdef VJC 1249 if (sc->sc_flags & SC_VJ_RESET) { 1250 /* 1251 * If we've missed a packet, we must toss subsequent compressed 1252 * packets which don't have an explicit connection ID. 1253 */ 1254 if (sc->sc_comp) 1255 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1256 s = splhigh(); 1257 sc->sc_flags &= ~SC_VJ_RESET; 1258 splx(s); 1259 } 1260 1261 /* 1262 * See if we have a VJ-compressed packet to uncompress. 1263 */ 1264 if (proto == PPP_VJC_COMP) { 1265 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1266 goto bad; 1267 1268 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1269 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1270 sc->sc_comp, &iphdr, &hlen); 1271 1272 if (xlen <= 0) { 1273 if (sc->sc_flags & SC_DEBUG) 1274 kprintf("%s: VJ uncompress failed on type comp\n", 1275 ifp->if_xname); 1276 goto bad; 1277 } 1278 1279 /* Copy the PPP and IP headers into a new mbuf. */ 1280 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1281 if (mp == NULL) 1282 goto bad; 1283 mp->m_len = 0; 1284 mp->m_next = NULL; 1285 if (hlen + PPP_HDRLEN > MHLEN) { 1286 MCLGET(mp, M_DONTWAIT); 1287 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1288 m_freem(mp); 1289 goto bad; /* lose if big headers and no clusters */ 1290 } 1291 } 1292 cp = mtod(mp, u_char *); 1293 cp[0] = adrs; 1294 cp[1] = ctrl; 1295 cp[2] = 0; 1296 cp[3] = PPP_IP; 1297 proto = PPP_IP; 1298 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1299 mp->m_len = hlen + PPP_HDRLEN; 1300 1301 /* 1302 * Trim the PPP and VJ headers off the old mbuf 1303 * and stick the new and old mbufs together. 1304 */ 1305 m->m_data += PPP_HDRLEN + xlen; 1306 m->m_len -= PPP_HDRLEN + xlen; 1307 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1308 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1309 mp->m_len += m->m_len; 1310 MFREE(m, mp->m_next); 1311 } else 1312 mp->m_next = m; 1313 m = mp; 1314 ilen += hlen - xlen; 1315 1316 } else if (proto == PPP_VJC_UNCOMP) { 1317 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1318 goto bad; 1319 1320 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1321 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1322 sc->sc_comp, &iphdr, &hlen); 1323 1324 if (xlen < 0) { 1325 if (sc->sc_flags & SC_DEBUG) 1326 kprintf("%s: VJ uncompress failed on type uncomp\n", 1327 ifp->if_xname); 1328 goto bad; 1329 } 1330 1331 proto = PPP_IP; 1332 cp[3] = PPP_IP; 1333 } 1334 #endif /* VJC */ 1335 1336 /* 1337 * If the packet will fit in a header mbuf, don't waste a 1338 * whole cluster on it. 1339 */ 1340 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1341 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1342 if (mp != NULL) { 1343 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1344 m_freem(m); 1345 m = mp; 1346 m->m_len = ilen; 1347 } 1348 } 1349 m->m_pkthdr.len = ilen; 1350 m->m_pkthdr.rcvif = ifp; 1351 1352 /* 1353 * See whether we want to pass this packet, and 1354 * if it counts as link activity. 1355 */ 1356 if ((proto & 0x8000) == 0) { 1357 adrs = *mtod(m, u_char *); /* save address field */ 1358 *mtod(m, u_char *) = 0; /* indicate inbound */ 1359 if (sc->sc_pass_filt.bf_insns != 0 1360 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1361 ilen, 0) == 0) { 1362 /* drop this packet */ 1363 m_freem(m); 1364 return; 1365 } 1366 if (sc->sc_active_filt.bf_insns == 0 1367 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1368 sc->sc_last_recv = time.tv_sec; 1369 1370 *mtod(m, u_char *) = adrs; 1371 } 1372 1373 #if NBPFILTER > 0 1374 /* See if bpf wants to look at the packet. */ 1375 if (sc->sc_bpf) 1376 bpf_mtap(sc->sc_bpf, m); 1377 #endif 1378 1379 rv = 0; 1380 switch (proto) { 1381 #ifdef INET 1382 case PPP_IP: 1383 /* 1384 * IP packet - take off the ppp header and pass it up to IP. 1385 */ 1386 if ((ifp->if_flags & IFF_UP) == 0 1387 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1388 /* interface is down - drop the packet. */ 1389 m_freem(m); 1390 return; 1391 } 1392 m->m_pkthdr.len -= PPP_HDRLEN; 1393 m->m_data += PPP_HDRLEN; 1394 m->m_len -= PPP_HDRLEN; 1395 schednetisr(NETISR_IP); 1396 inq = &ipintrq; 1397 break; 1398 #endif 1399 1400 default: 1401 /* 1402 * Some other protocol - place on input queue for read(). 1403 */ 1404 inq = &sc->sc_inq; 1405 rv = 1; 1406 break; 1407 } 1408 1409 /* 1410 * Put the packet on the appropriate input queue. 1411 */ 1412 s = splhigh(); 1413 if (IF_QFULL(inq)) { 1414 IF_DROP(inq); 1415 splx(s); 1416 if (sc->sc_flags & SC_DEBUG) 1417 kprintf("%s: input queue full\n", ifp->if_xname); 1418 ifp->if_iqdrops++; 1419 goto bad; 1420 } 1421 IF_ENQUEUE(inq, m); 1422 splx(s); 1423 ifp->if_ipackets++; 1424 ifp->if_ibytes += ilen; 1425 ifp->if_lastchange = time; 1426 1427 if (rv) 1428 (*sc->sc_ctlp)(sc); 1429 1430 return; 1431 1432 bad: 1433 m_freem(m); 1434 sc->sc_if.if_ierrors++; 1435 sc->sc_stats.ppp_ierrors++; 1436 } 1437 1438 #define MAX_DUMP_BYTES 128 1439 1440 static void 1441 pppdumpm(m0) 1442 struct mbuf *m0; 1443 { 1444 char buf[3*MAX_DUMP_BYTES+4]; 1445 char *bp = buf; 1446 struct mbuf *m; 1447 static char digits[] = "0123456789abcdef"; 1448 1449 for (m = m0; m; m = m->m_next) { 1450 int l = m->m_len; 1451 u_char *rptr = (u_char *)m->m_data; 1452 1453 while (l--) { 1454 if (bp > buf + sizeof(buf) - 4) 1455 goto done; 1456 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1457 *bp++ = digits[*rptr++ & 0xf]; 1458 } 1459 1460 if (m->m_next) { 1461 if (bp > buf + sizeof(buf) - 3) 1462 goto done; 1463 *bp++ = '|'; 1464 } else 1465 *bp++ = ' '; 1466 } 1467 done: 1468 if (m) 1469 *bp++ = '>'; 1470 *bp = 0; 1471 kprintf("%s\n", buf); 1472 } 1473 1474 #endif /* NPPP > 0 */ 1475
Indexes created Fri Sep 26 20:09:58 GMT 2025