if_ppp.c revision 1.31
1 /* $NetBSD: if_ppp.c,v 1.31 1996/05/07 02:40:36 thorpej 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 sprintf(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 printf("%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 printf("%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 printf("%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 struct proc *p = curproc; /* XXX */ 532 register struct ppp_softc *sc = ifp->if_softc; 533 register struct ifaddr *ifa = (struct ifaddr *)data; 534 register struct ifreq *ifr = (struct ifreq *)data; 535 struct ppp_stats *psp; 536 #ifdef PPP_COMPRESS 537 struct ppp_comp_stats *pcp; 538 #endif 539 int s = splimp(), error = 0; 540 541 switch (cmd) { 542 case SIOCSIFFLAGS: 543 if ((ifp->if_flags & IFF_RUNNING) == 0) 544 ifp->if_flags &= ~IFF_UP; 545 break; 546 547 case SIOCSIFADDR: 548 if (ifa->ifa_addr->sa_family != AF_INET) 549 error = EAFNOSUPPORT; 550 break; 551 552 case SIOCSIFDSTADDR: 553 if (ifa->ifa_addr->sa_family != AF_INET) 554 error = EAFNOSUPPORT; 555 break; 556 557 case SIOCSIFMTU: 558 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 559 break; 560 sc->sc_if.if_mtu = ifr->ifr_mtu; 561 break; 562 563 case SIOCGIFMTU: 564 ifr->ifr_mtu = sc->sc_if.if_mtu; 565 break; 566 567 case SIOCADDMULTI: 568 case SIOCDELMULTI: 569 if (ifr == 0) { 570 error = EAFNOSUPPORT; 571 break; 572 } 573 switch(ifr->ifr_addr.sa_family) { 574 #ifdef INET 575 case AF_INET: 576 break; 577 #endif 578 default: 579 error = EAFNOSUPPORT; 580 break; 581 } 582 break; 583 584 case SIOCGPPPSTATS: 585 psp = &((struct ifpppstatsreq *) data)->stats; 586 bzero(psp, sizeof(*psp)); 587 psp->p = sc->sc_stats; 588 #if defined(VJC) && !defined(SL_NO_STATS) 589 if (sc->sc_comp) { 590 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 591 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 592 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 593 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 594 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 595 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 596 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 597 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 598 } 599 #endif /* VJC */ 600 break; 601 602 #ifdef PPP_COMPRESS 603 case SIOCGPPPCSTATS: 604 pcp = &((struct ifpppcstatsreq *) data)->stats; 605 bzero(pcp, sizeof(*pcp)); 606 if (sc->sc_xc_state != NULL) 607 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 608 if (sc->sc_rc_state != NULL) 609 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 610 break; 611 #endif /* PPP_COMPRESS */ 612 613 default: 614 error = EINVAL; 615 } 616 splx(s); 617 return (error); 618 } 619 620 /* 621 * Queue a packet. Start transmission if not active. 622 * Packet is placed in Information field of PPP frame. 623 */ 624 int 625 pppoutput(ifp, m0, dst, rtp) 626 struct ifnet *ifp; 627 struct mbuf *m0; 628 struct sockaddr *dst; 629 struct rtentry *rtp; 630 { 631 register struct ppp_softc *sc = ifp->if_softc; 632 int protocol, address, control; 633 u_char *cp; 634 int s, error; 635 struct ip *ip; 636 struct ifqueue *ifq; 637 enum NPmode mode; 638 int active, len; 639 struct mbuf *m; 640 641 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 642 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 643 error = ENETDOWN; /* sort of */ 644 goto bad; 645 } 646 647 /* 648 * Compute PPP header. 649 */ 650 m0->m_flags &= ~M_HIGHPRI; 651 switch (dst->sa_family) { 652 #ifdef INET 653 case AF_INET: 654 address = PPP_ALLSTATIONS; 655 control = PPP_UI; 656 protocol = PPP_IP; 657 mode = sc->sc_npmode[NP_IP]; 658 659 /* 660 * If this packet has the "low delay" bit set in the IP header, 661 * put it on the fastq instead. 662 */ 663 ip = mtod(m0, struct ip *); 664 if (ip->ip_tos & IPTOS_LOWDELAY) 665 m0->m_flags |= M_HIGHPRI; 666 break; 667 #endif 668 case AF_UNSPEC: 669 address = PPP_ADDRESS(dst->sa_data); 670 control = PPP_CONTROL(dst->sa_data); 671 protocol = PPP_PROTOCOL(dst->sa_data); 672 mode = NPMODE_PASS; 673 break; 674 default: 675 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 676 error = EAFNOSUPPORT; 677 goto bad; 678 } 679 680 /* 681 * Drop this packet, or return an error, if necessary. 682 */ 683 if (mode == NPMODE_ERROR) { 684 error = ENETDOWN; 685 goto bad; 686 } 687 if (mode == NPMODE_DROP) { 688 error = 0; 689 goto bad; 690 } 691 692 /* 693 * Add PPP header. If no space in first mbuf, allocate another. 694 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 695 */ 696 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 697 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 698 if (m0 == 0) { 699 error = ENOBUFS; 700 goto bad; 701 } 702 m0->m_len = 0; 703 } else 704 m0->m_data -= PPP_HDRLEN; 705 706 cp = mtod(m0, u_char *); 707 *cp++ = address; 708 *cp++ = control; 709 *cp++ = protocol >> 8; 710 *cp++ = protocol & 0xff; 711 m0->m_len += PPP_HDRLEN; 712 713 len = 0; 714 for (m = m0; m != 0; m = m->m_next) 715 len += m->m_len; 716 717 if (sc->sc_flags & SC_LOG_OUTPKT) { 718 printf("%s output: ", ifp->if_xname); 719 pppdumpm(m0); 720 } 721 722 /* 723 * Apply the pass and active filters to the packet, 724 * but only if it is a data packet. 725 */ 726 active = 0; 727 if ((protocol & 0x8000) == 0) { 728 *mtod(m0, u_char *) = 1; /* indicates outbound */ 729 if (sc->sc_pass_filt.bf_insns != 0 730 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 731 len, 0) == 0) { 732 error = 0; /* drop this packet */ 733 goto bad; 734 } 735 736 /* 737 * Update the time we sent the most recent packet. 738 */ 739 if (sc->sc_active_filt.bf_insns == 0 740 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 741 sc->sc_last_sent = time.tv_sec; 742 743 *mtod(m0, u_char *) = address; 744 } 745 746 #if NBPFILTER > 0 747 /* 748 * See if bpf wants to look at the packet. 749 */ 750 if (sc->sc_bpf) 751 bpf_mtap(sc->sc_bpf, m0); 752 #endif 753 754 /* 755 * Put the packet on the appropriate queue. 756 */ 757 s = splsoftnet(); 758 if (mode == NPMODE_QUEUE) { 759 /* XXX we should limit the number of packets on this queue */ 760 *sc->sc_npqtail = m0; 761 m0->m_nextpkt = NULL; 762 sc->sc_npqtail = &m0->m_nextpkt; 763 } else { 764 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 765 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 766 IF_DROP(ifq); 767 splx(s); 768 sc->sc_if.if_oerrors++; 769 sc->sc_stats.ppp_oerrors++; 770 error = ENOBUFS; 771 goto bad; 772 } 773 IF_ENQUEUE(ifq, m0); 774 (*sc->sc_start)(sc); 775 } 776 ifp->if_lastchange = time; 777 ifp->if_opackets++; 778 ifp->if_obytes += len; 779 780 splx(s); 781 return (0); 782 783 bad: 784 m_freem(m0); 785 return (error); 786 } 787 788 /* 789 * After a change in the NPmode for some NP, move packets from the 790 * npqueue to the send queue or the fast queue as appropriate. 791 * Should be called at splsoftnet. 792 */ 793 static void 794 ppp_requeue(sc) 795 struct ppp_softc *sc; 796 { 797 struct mbuf *m, **mpp; 798 struct ifqueue *ifq; 799 enum NPmode mode; 800 801 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 802 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 803 case PPP_IP: 804 mode = sc->sc_npmode[NP_IP]; 805 break; 806 default: 807 mode = NPMODE_PASS; 808 } 809 810 switch (mode) { 811 case NPMODE_PASS: 812 /* 813 * This packet can now go on one of the queues to be sent. 814 */ 815 *mpp = m->m_nextpkt; 816 m->m_nextpkt = NULL; 817 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 818 if (IF_QFULL(ifq)) { 819 IF_DROP(ifq); 820 sc->sc_if.if_oerrors++; 821 sc->sc_stats.ppp_oerrors++; 822 } else 823 IF_ENQUEUE(ifq, m); 824 break; 825 826 case NPMODE_DROP: 827 case NPMODE_ERROR: 828 *mpp = m->m_nextpkt; 829 m_freem(m); 830 break; 831 832 case NPMODE_QUEUE: 833 mpp = &m->m_nextpkt; 834 break; 835 } 836 } 837 sc->sc_npqtail = mpp; 838 } 839 840 /* 841 * Get a packet to send. This procedure is intended to be called at 842 * spltty or splimp, so it takes little time. If there isn't a packet 843 * waiting to go out, it schedules a software interrupt to prepare a 844 * new packet; the device start routine gets called again when a 845 * packet is ready. 846 */ 847 struct mbuf * 848 ppp_dequeue(sc) 849 struct ppp_softc *sc; 850 { 851 struct mbuf *m; 852 int s = splhigh(); 853 854 m = sc->sc_togo; 855 if (m) { 856 /* 857 * Had a packet waiting - send it. 858 */ 859 sc->sc_togo = NULL; 860 sc->sc_flags |= SC_TBUSY; 861 splx(s); 862 return m; 863 } 864 /* 865 * Remember we wanted a packet and schedule a software interrupt. 866 */ 867 sc->sc_flags &= ~SC_TBUSY; 868 schednetisr(NETISR_PPP); 869 splx(s); 870 return NULL; 871 } 872 873 /* 874 * Software interrupt routine, called at splsoftnet. 875 */ 876 void 877 pppintr() 878 { 879 struct ppp_softc *sc; 880 int i, s; 881 struct mbuf *m; 882 883 sc = ppp_softc; 884 for (i = 0; i < NPPP; ++i, ++sc) { 885 if (!(sc->sc_flags & SC_TBUSY) && sc->sc_togo == NULL 886 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) 887 ppp_outpkt(sc); 888 for (;;) { 889 s = splhigh(); 890 IF_DEQUEUE(&sc->sc_rawq, m); 891 splx(s); 892 if (m == NULL) 893 break; 894 ppp_inproc(sc, m); 895 } 896 } 897 } 898 899 /* 900 * Grab another packet off a queue and apply VJ compression, 901 * packet compression, address/control and/or protocol compression 902 * if enabled. Should be called at splsoftnet. 903 */ 904 static void 905 ppp_outpkt(sc) 906 struct ppp_softc *sc; 907 { 908 struct mbuf *m, *mp; 909 u_char *cp; 910 int address, control, protocol; 911 912 /* 913 * Grab a packet to send: first try the fast queue, then the 914 * normal queue. 915 */ 916 IF_DEQUEUE(&sc->sc_fastq, m); 917 if (m == NULL) 918 IF_DEQUEUE(&sc->sc_if.if_snd, m); 919 if (m == NULL) 920 return; 921 922 ++sc->sc_stats.ppp_opackets; 923 924 /* 925 * Extract the ppp header of the new packet. 926 * The ppp header will be in one mbuf. 927 */ 928 cp = mtod(m, u_char *); 929 address = PPP_ADDRESS(cp); 930 control = PPP_CONTROL(cp); 931 protocol = PPP_PROTOCOL(cp); 932 933 switch (protocol) { 934 case PPP_IP: 935 #ifdef VJC 936 /* 937 * If the packet is a TCP/IP packet, see if we can compress it. 938 */ 939 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 940 struct ip *ip; 941 int type; 942 943 mp = m; 944 ip = (struct ip *) (cp + PPP_HDRLEN); 945 if (mp->m_len <= PPP_HDRLEN) { 946 mp = mp->m_next; 947 if (mp == NULL) 948 break; 949 ip = mtod(mp, struct ip *); 950 } 951 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 952 if (ip->ip_p == IPPROTO_TCP) { 953 type = sl_compress_tcp(mp, ip, sc->sc_comp, 954 !(sc->sc_flags & SC_NO_TCP_CCID)); 955 switch (type) { 956 case TYPE_UNCOMPRESSED_TCP: 957 protocol = PPP_VJC_UNCOMP; 958 break; 959 case TYPE_COMPRESSED_TCP: 960 protocol = PPP_VJC_COMP; 961 cp = mtod(m, u_char *); 962 cp[0] = address; /* header has moved */ 963 cp[1] = control; 964 cp[2] = 0; 965 break; 966 } 967 cp[3] = protocol; /* update protocol in PPP header */ 968 } 969 } 970 #endif /* VJC */ 971 break; 972 973 #ifdef PPP_COMPRESS 974 case PPP_CCP: 975 ppp_ccp(sc, m, 0); 976 break; 977 #endif /* PPP_COMPRESS */ 978 } 979 980 #ifdef PPP_COMPRESS 981 if (protocol != PPP_LCP && protocol != PPP_CCP 982 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 983 struct mbuf *mcomp = NULL; 984 int slen, clen; 985 986 slen = 0; 987 for (mp = m; mp != NULL; mp = mp->m_next) 988 slen += mp->m_len; 989 clen = (*sc->sc_xcomp->compress) 990 (sc->sc_xc_state, &mcomp, m, slen, 991 (sc->sc_flags & SC_CCP_UP? sc->sc_if.if_mtu: 0)); 992 if (mcomp != NULL) { 993 m_freem(m); 994 m = mcomp; 995 cp = mtod(m, u_char *); 996 protocol = cp[3]; 997 } 998 } 999 #endif /* PPP_COMPRESS */ 1000 1001 /* 1002 * Compress the address/control and protocol, if possible. 1003 */ 1004 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1005 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1006 protocol != PPP_LCP) { 1007 /* can compress address/control */ 1008 m->m_data += 2; 1009 m->m_len -= 2; 1010 } 1011 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1012 /* can compress protocol */ 1013 if (mtod(m, u_char *) == cp) { 1014 cp[2] = cp[1]; /* move address/control up */ 1015 cp[1] = cp[0]; 1016 } 1017 ++m->m_data; 1018 --m->m_len; 1019 } 1020 1021 sc->sc_togo = m; 1022 (*sc->sc_start)(sc); 1023 } 1024 1025 #ifdef PPP_COMPRESS 1026 /* 1027 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1028 * 0 if it is about to be transmitted. 1029 */ 1030 static void 1031 ppp_ccp(sc, m, rcvd) 1032 struct ppp_softc *sc; 1033 struct mbuf *m; 1034 int rcvd; 1035 { 1036 u_char *dp, *ep; 1037 struct mbuf *mp; 1038 int slen, s; 1039 1040 /* 1041 * Get a pointer to the data after the PPP header. 1042 */ 1043 if (m->m_len <= PPP_HDRLEN) { 1044 mp = m->m_next; 1045 if (mp == NULL) 1046 return; 1047 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1048 } else { 1049 mp = m; 1050 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1051 } 1052 1053 ep = mtod(mp, u_char *) + mp->m_len; 1054 if (dp + CCP_HDRLEN > ep) 1055 return; 1056 slen = CCP_LENGTH(dp); 1057 if (dp + slen > ep) { 1058 if (sc->sc_flags & SC_DEBUG) 1059 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1060 dp, slen, mtod(mp, u_char *), mp->m_len); 1061 return; 1062 } 1063 1064 switch (CCP_CODE(dp)) { 1065 case CCP_CONFREQ: 1066 case CCP_TERMREQ: 1067 case CCP_TERMACK: 1068 /* CCP must be going down - disable compression */ 1069 if (sc->sc_flags & SC_CCP_UP) { 1070 s = splhigh(); 1071 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1072 splx(s); 1073 } 1074 break; 1075 1076 case CCP_CONFACK: 1077 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1078 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1079 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1080 if (!rcvd) { 1081 /* we're agreeing to send compressed packets. */ 1082 if (sc->sc_xc_state != NULL 1083 && (*sc->sc_xcomp->comp_init) 1084 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1085 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1086 s = splhigh(); 1087 sc->sc_flags |= SC_COMP_RUN; 1088 splx(s); 1089 } 1090 } else { 1091 /* peer is agreeing to send compressed packets. */ 1092 if (sc->sc_rc_state != NULL 1093 && (*sc->sc_rcomp->decomp_init) 1094 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1095 sc->sc_unit, 0, sc->sc_mru, 1096 sc->sc_flags & SC_DEBUG)) { 1097 s = splhigh(); 1098 sc->sc_flags |= SC_DECOMP_RUN; 1099 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1100 splx(s); 1101 } 1102 } 1103 } 1104 break; 1105 1106 case CCP_RESETACK: 1107 if (sc->sc_flags & SC_CCP_UP) { 1108 if (!rcvd) { 1109 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1110 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1111 } else { 1112 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1113 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1114 s = splhigh(); 1115 sc->sc_flags &= ~SC_DC_ERROR; 1116 splx(s); 1117 } 1118 } 1119 } 1120 break; 1121 } 1122 } 1123 1124 /* 1125 * CCP is down; free (de)compressor state if necessary. 1126 */ 1127 static void 1128 ppp_ccp_closed(sc) 1129 struct ppp_softc *sc; 1130 { 1131 if (sc->sc_xc_state) { 1132 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1133 sc->sc_xc_state = NULL; 1134 } 1135 if (sc->sc_rc_state) { 1136 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1137 sc->sc_rc_state = NULL; 1138 } 1139 } 1140 #endif /* PPP_COMPRESS */ 1141 1142 /* 1143 * PPP packet input routine. 1144 * The caller has checked and removed the FCS and has inserted 1145 * the address/control bytes and the protocol high byte if they 1146 * were omitted. 1147 */ 1148 void 1149 ppppktin(sc, m, lost) 1150 struct ppp_softc *sc; 1151 struct mbuf *m; 1152 int lost; 1153 { 1154 int s = splhigh(); 1155 1156 if (lost) 1157 m->m_flags |= M_ERRMARK; 1158 IF_ENQUEUE(&sc->sc_rawq, m); 1159 schednetisr(NETISR_PPP); 1160 splx(s); 1161 } 1162 1163 /* 1164 * Process a received PPP packet, doing decompression as necessary. 1165 * Should be called at splsoftnet. 1166 */ 1167 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1168 TYPE_UNCOMPRESSED_TCP) 1169 1170 static void 1171 ppp_inproc(sc, m) 1172 struct ppp_softc *sc; 1173 struct mbuf *m; 1174 { 1175 struct ifnet *ifp = &sc->sc_if; 1176 struct ifqueue *inq; 1177 int s, ilen, xlen, proto, rv; 1178 u_char *cp, adrs, ctrl; 1179 struct mbuf *mp, *dmp = NULL; 1180 u_char *iphdr; 1181 u_int hlen; 1182 1183 sc->sc_stats.ppp_ipackets++; 1184 1185 if (sc->sc_flags & SC_LOG_INPKT) { 1186 ilen = 0; 1187 for (mp = m; mp != NULL; mp = mp->m_next) 1188 ilen += mp->m_len; 1189 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1190 pppdumpm(m); 1191 } 1192 1193 cp = mtod(m, u_char *); 1194 adrs = PPP_ADDRESS(cp); 1195 ctrl = PPP_CONTROL(cp); 1196 proto = PPP_PROTOCOL(cp); 1197 1198 if (m->m_flags & M_ERRMARK) { 1199 m->m_flags &= ~M_ERRMARK; 1200 s = splhigh(); 1201 sc->sc_flags |= SC_VJ_RESET; 1202 splx(s); 1203 } 1204 1205 #ifdef PPP_COMPRESS 1206 /* 1207 * Decompress this packet if necessary, update the receiver's 1208 * dictionary, or take appropriate action on a CCP packet. 1209 */ 1210 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1211 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1212 /* decompress this packet */ 1213 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1214 if (rv == DECOMP_OK) { 1215 m_freem(m); 1216 if (dmp == NULL) { 1217 /* no error, but no decompressed packet produced */ 1218 return; 1219 } 1220 m = dmp; 1221 cp = mtod(m, u_char *); 1222 proto = PPP_PROTOCOL(cp); 1223 1224 } else { 1225 /* 1226 * An error has occurred in decompression. 1227 * Pass the compressed packet up to pppd, which may take 1228 * CCP down or issue a Reset-Req. 1229 */ 1230 if (sc->sc_flags & SC_DEBUG) 1231 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1232 s = splhigh(); 1233 sc->sc_flags |= SC_VJ_RESET; 1234 if (rv == DECOMP_ERROR) 1235 sc->sc_flags |= SC_DC_ERROR; 1236 else 1237 sc->sc_flags |= SC_DC_FERROR; 1238 splx(s); 1239 } 1240 1241 } else { 1242 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1243 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1244 } 1245 if (proto == PPP_CCP) { 1246 ppp_ccp(sc, m, 1); 1247 } 1248 } 1249 #endif 1250 1251 ilen = 0; 1252 for (mp = m; mp != NULL; mp = mp->m_next) 1253 ilen += mp->m_len; 1254 1255 #ifdef VJC 1256 if (sc->sc_flags & SC_VJ_RESET) { 1257 /* 1258 * If we've missed a packet, we must toss subsequent compressed 1259 * packets which don't have an explicit connection ID. 1260 */ 1261 if (sc->sc_comp) 1262 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1263 s = splhigh(); 1264 sc->sc_flags &= ~SC_VJ_RESET; 1265 splx(s); 1266 } 1267 1268 /* 1269 * See if we have a VJ-compressed packet to uncompress. 1270 */ 1271 if (proto == PPP_VJC_COMP) { 1272 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1273 goto bad; 1274 1275 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1276 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1277 sc->sc_comp, &iphdr, &hlen); 1278 1279 if (xlen <= 0) { 1280 if (sc->sc_flags & SC_DEBUG) 1281 printf("%s: VJ uncompress failed on type comp\n", 1282 ifp->if_xname); 1283 goto bad; 1284 } 1285 1286 /* Copy the PPP and IP headers into a new mbuf. */ 1287 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1288 if (mp == NULL) 1289 goto bad; 1290 mp->m_len = 0; 1291 mp->m_next = NULL; 1292 if (hlen + PPP_HDRLEN > MHLEN) { 1293 MCLGET(mp, M_DONTWAIT); 1294 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1295 m_freem(mp); 1296 goto bad; /* lose if big headers and no clusters */ 1297 } 1298 } 1299 cp = mtod(mp, u_char *); 1300 cp[0] = adrs; 1301 cp[1] = ctrl; 1302 cp[2] = 0; 1303 cp[3] = PPP_IP; 1304 proto = PPP_IP; 1305 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1306 mp->m_len = hlen + PPP_HDRLEN; 1307 1308 /* 1309 * Trim the PPP and VJ headers off the old mbuf 1310 * and stick the new and old mbufs together. 1311 */ 1312 m->m_data += PPP_HDRLEN + xlen; 1313 m->m_len -= PPP_HDRLEN + xlen; 1314 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1315 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1316 mp->m_len += m->m_len; 1317 MFREE(m, mp->m_next); 1318 } else 1319 mp->m_next = m; 1320 m = mp; 1321 ilen += hlen - xlen; 1322 1323 } else if (proto == PPP_VJC_UNCOMP) { 1324 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1325 goto bad; 1326 1327 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1328 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1329 sc->sc_comp, &iphdr, &hlen); 1330 1331 if (xlen < 0) { 1332 if (sc->sc_flags & SC_DEBUG) 1333 printf("%s: VJ uncompress failed on type uncomp\n", 1334 ifp->if_xname); 1335 goto bad; 1336 } 1337 1338 proto = PPP_IP; 1339 cp[3] = PPP_IP; 1340 } 1341 #endif /* VJC */ 1342 1343 /* 1344 * If the packet will fit in a header mbuf, don't waste a 1345 * whole cluster on it. 1346 */ 1347 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1348 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1349 if (mp != NULL) { 1350 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1351 m_freem(m); 1352 m = mp; 1353 m->m_len = ilen; 1354 } 1355 } 1356 m->m_pkthdr.len = ilen; 1357 m->m_pkthdr.rcvif = ifp; 1358 1359 /* 1360 * See whether we want to pass this packet, and 1361 * if it counts as link activity. 1362 */ 1363 if ((proto & 0x8000) == 0) { 1364 adrs = *mtod(m, u_char *); /* save address field */ 1365 *mtod(m, u_char *) = 0; /* indicate inbound */ 1366 if (sc->sc_pass_filt.bf_insns != 0 1367 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1368 ilen, 0) == 0) { 1369 /* drop this packet */ 1370 m_freem(m); 1371 return; 1372 } 1373 if (sc->sc_active_filt.bf_insns == 0 1374 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1375 sc->sc_last_recv = time.tv_sec; 1376 1377 *mtod(m, u_char *) = adrs; 1378 } 1379 1380 #if NBPFILTER > 0 1381 /* See if bpf wants to look at the packet. */ 1382 if (sc->sc_bpf) 1383 bpf_mtap(sc->sc_bpf, m); 1384 #endif 1385 1386 rv = 0; 1387 switch (proto) { 1388 #ifdef INET 1389 case PPP_IP: 1390 /* 1391 * IP packet - take off the ppp header and pass it up to IP. 1392 */ 1393 if ((ifp->if_flags & IFF_UP) == 0 1394 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1395 /* interface is down - drop the packet. */ 1396 m_freem(m); 1397 return; 1398 } 1399 m->m_pkthdr.len -= PPP_HDRLEN; 1400 m->m_data += PPP_HDRLEN; 1401 m->m_len -= PPP_HDRLEN; 1402 schednetisr(NETISR_IP); 1403 inq = &ipintrq; 1404 break; 1405 #endif 1406 1407 default: 1408 /* 1409 * Some other protocol - place on input queue for read(). 1410 */ 1411 inq = &sc->sc_inq; 1412 rv = 1; 1413 break; 1414 } 1415 1416 /* 1417 * Put the packet on the appropriate input queue. 1418 */ 1419 s = splhigh(); 1420 if (IF_QFULL(inq)) { 1421 IF_DROP(inq); 1422 splx(s); 1423 if (sc->sc_flags & SC_DEBUG) 1424 printf("%s: input queue full\n", ifp->if_xname); 1425 ifp->if_iqdrops++; 1426 goto bad; 1427 } 1428 IF_ENQUEUE(inq, m); 1429 splx(s); 1430 ifp->if_ipackets++; 1431 ifp->if_ibytes += ilen; 1432 ifp->if_lastchange = time; 1433 1434 if (rv) 1435 (*sc->sc_ctlp)(sc); 1436 1437 return; 1438 1439 bad: 1440 m_freem(m); 1441 sc->sc_if.if_ierrors++; 1442 sc->sc_stats.ppp_ierrors++; 1443 } 1444 1445 #define MAX_DUMP_BYTES 128 1446 1447 static void 1448 pppdumpm(m0) 1449 struct mbuf *m0; 1450 { 1451 char buf[3*MAX_DUMP_BYTES+4]; 1452 char *bp = buf; 1453 struct mbuf *m; 1454 static char digits[] = "0123456789abcdef"; 1455 1456 for (m = m0; m; m = m->m_next) { 1457 int l = m->m_len; 1458 u_char *rptr = (u_char *)m->m_data; 1459 1460 while (l--) { 1461 if (bp > buf + sizeof(buf) - 4) 1462 goto done; 1463 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1464 *bp++ = digits[*rptr++ & 0xf]; 1465 } 1466 1467 if (m->m_next) { 1468 if (bp > buf + sizeof(buf) - 3) 1469 goto done; 1470 *bp++ = '|'; 1471 } else 1472 *bp++ = ' '; 1473 } 1474 done: 1475 if (m) 1476 *bp++ = '>'; 1477 *bp = 0; 1478 printf("%s\n", buf); 1479 } 1480 1481 #endif /* NPPP > 0 */ 1482
Indexes created Thu Sep 25 16:09:42 GMT 2025