if_ppp.c revision 1.65
1 /* $NetBSD: if_ppp.c,v 1.65 2000/12/18 19:50:44 thorpej 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 80 #if NPPP > 0 81 82 #include "opt_inet.h" 83 #include "opt_gateway.h" 84 #include "opt_ppp.h" 85 86 #ifdef INET 87 #define VJC 88 #endif 89 #define PPP_COMPRESS 90 91 #include <sys/param.h> 92 #include <sys/proc.h> 93 #include <sys/mbuf.h> 94 #include <sys/socket.h> 95 #include <sys/ioctl.h> 96 #include <sys/kernel.h> 97 #include <sys/systm.h> 98 #include <sys/time.h> 99 #include <sys/malloc.h> 100 101 #include <net/if.h> 102 #include <net/if_types.h> 103 #include <net/netisr.h> 104 #include <net/route.h> 105 #ifdef PPP_FILTER 106 #include <net/bpf.h> 107 #endif 108 109 #include <netinet/in.h> 110 #include <netinet/in_systm.h> 111 #include <netinet/in_var.h> 112 #ifdef INET 113 #include <netinet/ip.h> 114 #endif 115 116 #include "bpfilter.h" 117 #if NBPFILTER > 0 118 #include <sys/time.h> 119 #include <net/bpf.h> 120 #endif 121 122 #if defined(PPP_FILTER) || NBPFILTER > 0 123 #include <net/slip.h> 124 #endif 125 126 #ifdef VJC 127 #include <net/slcompress.h> 128 #endif 129 130 #include <net/ppp_defs.h> 131 #include <net/if_ppp.h> 132 #include <net/if_pppvar.h> 133 #include <machine/cpu.h> 134 135 #ifdef PPP_COMPRESS 136 #define PACKETPTR struct mbuf * 137 #include <net/ppp-comp.h> 138 #endif 139 140 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 141 static void ppp_requeue __P((struct ppp_softc *)); 142 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 143 static void ppp_ccp_closed __P((struct ppp_softc *)); 144 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 145 static void pppdumpm __P((struct mbuf *m0)); 146 147 /* 148 * Some useful mbuf macros not in mbuf.h. 149 */ 150 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 151 152 #define M_DATASTART(m) \ 153 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 154 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 155 156 #define M_DATASIZE(m) \ 157 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 158 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 159 160 /* 161 * We define two link layer specific mbuf flags, to mark high-priority 162 * packets for output, and received packets following lost/corrupted 163 * packets. 164 */ 165 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 166 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 167 168 #ifdef PPP_COMPRESS 169 /* 170 * List of compressors we know about. 171 * We leave some space so maybe we can modload compressors. 172 */ 173 174 extern struct compressor ppp_bsd_compress; 175 extern struct compressor ppp_deflate, ppp_deflate_draft; 176 177 struct compressor *ppp_compressors[8] = { 178 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 179 &ppp_bsd_compress, 180 #endif 181 #if DO_DEFLATE && defined(PPP_DEFLATE) 182 &ppp_deflate, 183 &ppp_deflate_draft, 184 #endif 185 NULL 186 }; 187 #endif /* PPP_COMPRESS */ 188 189 190 /* 191 * Called from boot code to establish ppp interfaces. 192 */ 193 void 194 pppattach() 195 { 196 struct ppp_softc *sc; 197 int i = 0; 198 199 for (sc = ppp_softc; i < NPPP; sc++) { 200 sc->sc_unit = i; /* XXX */ 201 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 202 callout_init(&sc->sc_timo_ch); 203 sc->sc_if.if_softc = sc; 204 sc->sc_if.if_mtu = PPP_MTU; 205 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 206 sc->sc_if.if_type = IFT_PPP; 207 sc->sc_if.if_hdrlen = PPP_HDRLEN; 208 sc->sc_if.if_dlt = DLT_NULL; 209 sc->sc_if.if_ioctl = pppsioctl; 210 sc->sc_if.if_output = pppoutput; 211 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 212 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 213 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 214 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 215 IFQ_SET_READY(&sc->sc_if.if_snd); 216 if_attach(&sc->sc_if); 217 #if NBPFILTER > 0 218 bpfattach(&sc->sc_if, DLT_NULL, 0); 219 #endif 220 } 221 } 222 223 /* 224 * Allocate a ppp interface unit and initialize it. 225 */ 226 struct ppp_softc * 227 pppalloc(pid) 228 pid_t pid; 229 { 230 int nppp, i; 231 struct ppp_softc *sc; 232 233 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 234 if (sc->sc_xfer == pid) { 235 sc->sc_xfer = 0; 236 return sc; 237 } 238 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 239 if (sc->sc_devp == NULL) 240 break; 241 if (nppp >= NPPP) 242 return NULL; 243 244 sc->sc_flags = 0; 245 sc->sc_mru = PPP_MRU; 246 sc->sc_relinq = NULL; 247 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 248 #ifdef VJC 249 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 250 M_DEVBUF, M_NOWAIT); 251 if (sc->sc_comp) 252 sl_compress_init(sc->sc_comp); 253 #endif 254 #ifdef PPP_COMPRESS 255 sc->sc_xc_state = NULL; 256 sc->sc_rc_state = NULL; 257 #endif /* PPP_COMPRESS */ 258 for (i = 0; i < NUM_NP; ++i) 259 sc->sc_npmode[i] = NPMODE_ERROR; 260 sc->sc_npqueue = NULL; 261 sc->sc_npqtail = &sc->sc_npqueue; 262 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 263 264 return sc; 265 } 266 267 /* 268 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 269 */ 270 void 271 pppdealloc(sc) 272 struct ppp_softc *sc; 273 { 274 struct mbuf *m; 275 276 if_down(&sc->sc_if); 277 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 278 sc->sc_devp = NULL; 279 sc->sc_xfer = 0; 280 for (;;) { 281 IF_DEQUEUE(&sc->sc_rawq, m); 282 if (m == NULL) 283 break; 284 m_freem(m); 285 } 286 for (;;) { 287 IF_DEQUEUE(&sc->sc_inq, m); 288 if (m == NULL) 289 break; 290 m_freem(m); 291 } 292 for (;;) { 293 IF_DEQUEUE(&sc->sc_fastq, m); 294 if (m == NULL) 295 break; 296 m_freem(m); 297 } 298 while ((m = sc->sc_npqueue) != NULL) { 299 sc->sc_npqueue = m->m_nextpkt; 300 m_freem(m); 301 } 302 if (sc->sc_togo != NULL) { 303 m_freem(sc->sc_togo); 304 sc->sc_togo = NULL; 305 } 306 #ifdef PPP_COMPRESS 307 ppp_ccp_closed(sc); 308 sc->sc_xc_state = NULL; 309 sc->sc_rc_state = NULL; 310 #endif /* PPP_COMPRESS */ 311 #ifdef PPP_FILTER 312 if (sc->sc_pass_filt_in.bf_insns != 0) { 313 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 314 sc->sc_pass_filt_in.bf_insns = 0; 315 sc->sc_pass_filt_in.bf_len = 0; 316 } 317 if (sc->sc_pass_filt_out.bf_insns != 0) { 318 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 319 sc->sc_pass_filt_out.bf_insns = 0; 320 sc->sc_pass_filt_out.bf_len = 0; 321 } 322 if (sc->sc_active_filt_in.bf_insns != 0) { 323 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 324 sc->sc_active_filt_in.bf_insns = 0; 325 sc->sc_active_filt_in.bf_len = 0; 326 } 327 if (sc->sc_active_filt_out.bf_insns != 0) { 328 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 329 sc->sc_active_filt_out.bf_insns = 0; 330 sc->sc_active_filt_out.bf_len = 0; 331 } 332 #endif /* PPP_FILTER */ 333 #ifdef VJC 334 if (sc->sc_comp != 0) { 335 FREE(sc->sc_comp, M_DEVBUF); 336 sc->sc_comp = 0; 337 } 338 #endif 339 } 340 341 /* 342 * Ioctl routine for generic ppp devices. 343 */ 344 int 345 pppioctl(sc, cmd, data, flag, p) 346 struct ppp_softc *sc; 347 u_long cmd; 348 caddr_t data; 349 int flag; 350 struct proc *p; 351 { 352 int s, error, flags, mru, nb, npx; 353 struct ppp_option_data *odp; 354 struct compressor **cp; 355 struct npioctl *npi; 356 time_t t; 357 #ifdef PPP_FILTER 358 struct bpf_program *bp, *nbp; 359 struct bpf_insn *newcode, *oldcode; 360 int newcodelen; 361 #endif /* PPP_FILTER */ 362 #ifdef PPP_COMPRESS 363 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 364 #endif 365 366 switch (cmd) { 367 case FIONREAD: 368 *(int *)data = sc->sc_inq.ifq_len; 369 break; 370 371 case PPPIOCGUNIT: 372 *(int *)data = sc->sc_unit; /* XXX */ 373 break; 374 375 case PPPIOCGFLAGS: 376 *(u_int *)data = sc->sc_flags; 377 break; 378 379 case PPPIOCSFLAGS: 380 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 381 return (error); 382 flags = *(int *)data & SC_MASK; 383 s = splsoftnet(); 384 #ifdef PPP_COMPRESS 385 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 386 ppp_ccp_closed(sc); 387 #endif 388 splimp(); 389 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 390 splx(s); 391 break; 392 393 case PPPIOCSMRU: 394 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 395 return (error); 396 mru = *(int *)data; 397 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 398 sc->sc_mru = mru; 399 break; 400 401 case PPPIOCGMRU: 402 *(int *)data = sc->sc_mru; 403 break; 404 405 #ifdef VJC 406 case PPPIOCSMAXCID: 407 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 408 return (error); 409 if (sc->sc_comp) { 410 s = splsoftnet(); 411 sl_compress_setup(sc->sc_comp, *(int *)data); 412 splx(s); 413 } 414 break; 415 #endif 416 417 case PPPIOCXFERUNIT: 418 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 419 return (error); 420 sc->sc_xfer = p->p_pid; 421 break; 422 423 #ifdef PPP_COMPRESS 424 case PPPIOCSCOMPRESS: 425 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 426 return (error); 427 odp = (struct ppp_option_data *) data; 428 nb = odp->length; 429 if (nb > sizeof(ccp_option)) 430 nb = sizeof(ccp_option); 431 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 432 return (error); 433 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 434 return (EINVAL); 435 for (cp = ppp_compressors; *cp != NULL; ++cp) 436 if ((*cp)->compress_proto == ccp_option[0]) { 437 /* 438 * Found a handler for the protocol - try to allocate 439 * a compressor or decompressor. 440 */ 441 error = 0; 442 if (odp->transmit) { 443 s = splsoftnet(); 444 if (sc->sc_xc_state != NULL) 445 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 446 sc->sc_xcomp = *cp; 447 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 448 if (sc->sc_xc_state == NULL) { 449 if (sc->sc_flags & SC_DEBUG) 450 printf("%s: comp_alloc failed\n", 451 sc->sc_if.if_xname); 452 error = ENOBUFS; 453 } 454 splimp(); 455 sc->sc_flags &= ~SC_COMP_RUN; 456 splx(s); 457 } else { 458 s = splsoftnet(); 459 if (sc->sc_rc_state != NULL) 460 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 461 sc->sc_rcomp = *cp; 462 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 463 if (sc->sc_rc_state == NULL) { 464 if (sc->sc_flags & SC_DEBUG) 465 printf("%s: decomp_alloc failed\n", 466 sc->sc_if.if_xname); 467 error = ENOBUFS; 468 } 469 splimp(); 470 sc->sc_flags &= ~SC_DECOMP_RUN; 471 splx(s); 472 } 473 return (error); 474 } 475 if (sc->sc_flags & SC_DEBUG) 476 printf("%s: no compressor for [%x %x %x], %x\n", 477 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 478 ccp_option[2], nb); 479 return (EINVAL); /* no handler found */ 480 #endif /* PPP_COMPRESS */ 481 482 case PPPIOCGNPMODE: 483 case PPPIOCSNPMODE: 484 npi = (struct npioctl *) data; 485 switch (npi->protocol) { 486 case PPP_IP: 487 npx = NP_IP; 488 break; 489 case PPP_IPV6: 490 npx = NP_IPV6; 491 break; 492 default: 493 return EINVAL; 494 } 495 if (cmd == PPPIOCGNPMODE) { 496 npi->mode = sc->sc_npmode[npx]; 497 } else { 498 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 499 return (error); 500 if (npi->mode != sc->sc_npmode[npx]) { 501 s = splimp(); 502 sc->sc_npmode[npx] = npi->mode; 503 if (npi->mode != NPMODE_QUEUE) { 504 ppp_requeue(sc); 505 ppp_restart(sc); 506 } 507 splx(s); 508 } 509 } 510 break; 511 512 case PPPIOCGIDLE: 513 s = splsoftnet(); 514 t = time.tv_sec; 515 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 516 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 517 splx(s); 518 break; 519 520 #ifdef PPP_FILTER 521 case PPPIOCSPASS: 522 case PPPIOCSACTIVE: 523 /* These are no longer supported. */ 524 return EOPNOTSUPP; 525 526 case PPPIOCSIPASS: 527 case PPPIOCSOPASS: 528 case PPPIOCSIACTIVE: 529 case PPPIOCSOACTIVE: 530 nbp = (struct bpf_program *) data; 531 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 532 return EINVAL; 533 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 534 if (newcodelen != 0) { 535 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 536 /* WAITOK -- malloc() never fails. */ 537 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 538 newcodelen)) != 0) { 539 free(newcode, M_DEVBUF); 540 return error; 541 } 542 if (!bpf_validate(newcode, nbp->bf_len)) { 543 free(newcode, M_DEVBUF); 544 return EINVAL; 545 } 546 } else 547 newcode = 0; 548 switch (cmd) { 549 case PPPIOCSIPASS: 550 bp = &sc->sc_pass_filt_in; 551 break; 552 553 case PPPIOCSOPASS: 554 bp = &sc->sc_pass_filt_out; 555 break; 556 557 case PPPIOCSIACTIVE: 558 bp = &sc->sc_active_filt_in; 559 break; 560 561 case PPPIOCSOACTIVE: 562 bp = &sc->sc_active_filt_out; 563 break; 564 } 565 oldcode = bp->bf_insns; 566 s = splimp(); 567 bp->bf_len = nbp->bf_len; 568 bp->bf_insns = newcode; 569 splx(s); 570 if (oldcode != 0) 571 free(oldcode, M_DEVBUF); 572 break; 573 #endif /* PPP_FILTER */ 574 575 default: 576 return (-1); 577 } 578 return (0); 579 } 580 581 /* 582 * Process an ioctl request to the ppp network interface. 583 */ 584 static int 585 pppsioctl(ifp, cmd, data) 586 struct ifnet *ifp; 587 u_long cmd; 588 caddr_t data; 589 { 590 struct proc *p = curproc; /* XXX */ 591 struct ppp_softc *sc = ifp->if_softc; 592 struct ifaddr *ifa = (struct ifaddr *)data; 593 struct ifreq *ifr = (struct ifreq *)data; 594 struct ppp_stats *psp; 595 #ifdef PPP_COMPRESS 596 struct ppp_comp_stats *pcp; 597 #endif 598 int s = splimp(), error = 0; 599 600 switch (cmd) { 601 case SIOCSIFFLAGS: 602 if ((ifp->if_flags & IFF_RUNNING) == 0) 603 ifp->if_flags &= ~IFF_UP; 604 break; 605 606 case SIOCSIFADDR: 607 switch (ifa->ifa_addr->sa_family) { 608 #ifdef INET 609 case AF_INET: 610 break; 611 #endif 612 #ifdef INET6 613 case AF_INET6: 614 break; 615 #endif 616 default: 617 error = EAFNOSUPPORT; 618 break; 619 } 620 break; 621 622 case SIOCSIFDSTADDR: 623 switch (ifa->ifa_addr->sa_family) { 624 #ifdef INET 625 case AF_INET: 626 break; 627 #endif 628 #ifdef INET6 629 case AF_INET6: 630 break; 631 #endif 632 default: 633 error = EAFNOSUPPORT; 634 break; 635 } 636 break; 637 638 case SIOCSIFMTU: 639 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 640 break; 641 sc->sc_if.if_mtu = ifr->ifr_mtu; 642 break; 643 644 case SIOCGIFMTU: 645 ifr->ifr_mtu = sc->sc_if.if_mtu; 646 break; 647 648 case SIOCADDMULTI: 649 case SIOCDELMULTI: 650 if (ifr == 0) { 651 error = EAFNOSUPPORT; 652 break; 653 } 654 switch(ifr->ifr_addr.sa_family) { 655 #ifdef INET 656 case AF_INET: 657 break; 658 #endif 659 #ifdef INET6 660 case AF_INET6: 661 break; 662 #endif 663 default: 664 error = EAFNOSUPPORT; 665 break; 666 } 667 break; 668 669 case SIOCGPPPSTATS: 670 psp = &((struct ifpppstatsreq *) data)->stats; 671 bzero(psp, sizeof(*psp)); 672 psp->p = sc->sc_stats; 673 #if defined(VJC) && !defined(SL_NO_STATS) 674 if (sc->sc_comp) { 675 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 676 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 677 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 678 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 679 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 680 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 681 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 682 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 683 } 684 #endif /* VJC */ 685 break; 686 687 #ifdef PPP_COMPRESS 688 case SIOCGPPPCSTATS: 689 pcp = &((struct ifpppcstatsreq *) data)->stats; 690 bzero(pcp, sizeof(*pcp)); 691 if (sc->sc_xc_state != NULL) 692 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 693 if (sc->sc_rc_state != NULL) 694 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 695 break; 696 #endif /* PPP_COMPRESS */ 697 698 default: 699 error = EINVAL; 700 } 701 splx(s); 702 return (error); 703 } 704 705 /* 706 * Queue a packet. Start transmission if not active. 707 * Packet is placed in Information field of PPP frame. 708 */ 709 int 710 pppoutput(ifp, m0, dst, rtp) 711 struct ifnet *ifp; 712 struct mbuf *m0; 713 struct sockaddr *dst; 714 struct rtentry *rtp; 715 { 716 struct ppp_softc *sc = ifp->if_softc; 717 int protocol, address, control; 718 u_char *cp; 719 int s, error; 720 #ifdef INET 721 struct ip *ip; 722 #endif 723 struct ifqueue *ifq; 724 enum NPmode mode; 725 int len; 726 struct mbuf *m; 727 ALTQ_DECL(struct altq_pktattr pktattr;) 728 729 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 730 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 731 error = ENETDOWN; /* sort of */ 732 goto bad; 733 } 734 735 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 736 737 /* 738 * Compute PPP header. 739 */ 740 m0->m_flags &= ~M_HIGHPRI; 741 switch (dst->sa_family) { 742 #ifdef INET 743 case AF_INET: 744 address = PPP_ALLSTATIONS; 745 control = PPP_UI; 746 protocol = PPP_IP; 747 mode = sc->sc_npmode[NP_IP]; 748 749 /* 750 * If this packet has the "low delay" bit set in the IP header, 751 * put it on the fastq instead. 752 */ 753 ip = mtod(m0, struct ip *); 754 if (ip->ip_tos & IPTOS_LOWDELAY) 755 m0->m_flags |= M_HIGHPRI; 756 break; 757 #endif 758 #ifdef INET6 759 case AF_INET6: 760 address = PPP_ALLSTATIONS; /*XXX*/ 761 control = PPP_UI; /*XXX*/ 762 protocol = PPP_IPV6; 763 mode = sc->sc_npmode[NP_IPV6]; 764 765 #if 0 /* XXX flowinfo/traffic class, maybe? */ 766 /* 767 * If this packet has the "low delay" bit set in the IP header, 768 * put it on the fastq instead. 769 */ 770 ip = mtod(m0, struct ip *); 771 if (ip->ip_tos & IPTOS_LOWDELAY) 772 m0->m_flags |= M_HIGHPRI; 773 #endif 774 break; 775 #endif 776 case AF_UNSPEC: 777 address = PPP_ADDRESS(dst->sa_data); 778 control = PPP_CONTROL(dst->sa_data); 779 protocol = PPP_PROTOCOL(dst->sa_data); 780 mode = NPMODE_PASS; 781 break; 782 default: 783 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 784 error = EAFNOSUPPORT; 785 goto bad; 786 } 787 788 /* 789 * Drop this packet, or return an error, if necessary. 790 */ 791 if (mode == NPMODE_ERROR) { 792 error = ENETDOWN; 793 goto bad; 794 } 795 if (mode == NPMODE_DROP) { 796 error = 0; 797 goto bad; 798 } 799 800 /* 801 * Add PPP header. If no space in first mbuf, allocate another. 802 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 803 */ 804 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 805 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 806 if (m0 == 0) { 807 error = ENOBUFS; 808 goto bad; 809 } 810 m0->m_len = 0; 811 } else 812 m0->m_data -= PPP_HDRLEN; 813 814 cp = mtod(m0, u_char *); 815 *cp++ = address; 816 *cp++ = control; 817 *cp++ = protocol >> 8; 818 *cp++ = protocol & 0xff; 819 m0->m_len += PPP_HDRLEN; 820 821 len = 0; 822 for (m = m0; m != 0; m = m->m_next) 823 len += m->m_len; 824 825 if (sc->sc_flags & SC_LOG_OUTPKT) { 826 printf("%s output: ", ifp->if_xname); 827 pppdumpm(m0); 828 } 829 830 if ((protocol & 0x8000) == 0) { 831 #ifdef PPP_FILTER 832 /* 833 * Apply the pass and active filters to the packet, 834 * but only if it is a data packet. 835 */ 836 if (sc->sc_pass_filt_out.bf_insns != 0 837 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 838 len, 0) == 0) { 839 error = 0; /* drop this packet */ 840 goto bad; 841 } 842 843 /* 844 * Update the time we sent the most recent packet. 845 */ 846 if (sc->sc_active_filt_out.bf_insns == 0 847 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 848 len, 0)) 849 sc->sc_last_sent = time.tv_sec; 850 #else 851 /* 852 * Update the time we sent the most recent packet. 853 */ 854 sc->sc_last_sent = time.tv_sec; 855 #endif /* PPP_FILTER */ 856 } 857 858 #if NBPFILTER > 0 859 /* 860 * See if bpf wants to look at the packet. 861 */ 862 if (sc->sc_if.if_bpf) 863 bpf_mtap(sc->sc_if.if_bpf, m0); 864 #endif 865 866 /* 867 * Put the packet on the appropriate queue. 868 */ 869 s = splimp(); 870 if (mode == NPMODE_QUEUE) { 871 /* XXX we should limit the number of packets on this queue */ 872 *sc->sc_npqtail = m0; 873 m0->m_nextpkt = NULL; 874 sc->sc_npqtail = &m0->m_nextpkt; 875 } else { 876 if ((m0->m_flags & M_HIGHPRI) 877 #ifdef ALTQ 878 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 879 #endif 880 ) { 881 ifq = &sc->sc_fastq; 882 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 883 IF_DROP(ifq); 884 splx(s); 885 error = ENOBUFS; 886 goto bad; 887 } else { 888 IF_ENQUEUE(ifq, m0); 889 error = 0; 890 } 891 } else 892 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 893 if (error) { 894 splx(s); 895 sc->sc_if.if_oerrors++; 896 sc->sc_stats.ppp_oerrors++; 897 return (error); 898 } 899 ppp_restart(sc); 900 } 901 ifp->if_lastchange = time; 902 ifp->if_opackets++; 903 ifp->if_obytes += len; 904 905 splx(s); 906 return (0); 907 908 bad: 909 m_freem(m0); 910 return (error); 911 } 912 913 /* 914 * After a change in the NPmode for some NP, move packets from the 915 * npqueue to the send queue or the fast queue as appropriate. 916 * Should be called at splimp, since we muck with the queues. 917 */ 918 static void 919 ppp_requeue(sc) 920 struct ppp_softc *sc; 921 { 922 struct mbuf *m, **mpp; 923 struct ifqueue *ifq; 924 enum NPmode mode; 925 int error; 926 927 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 928 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 929 case PPP_IP: 930 mode = sc->sc_npmode[NP_IP]; 931 break; 932 case PPP_IPV6: 933 mode = sc->sc_npmode[NP_IPV6]; 934 break; 935 default: 936 mode = NPMODE_PASS; 937 } 938 939 switch (mode) { 940 case NPMODE_PASS: 941 /* 942 * This packet can now go on one of the queues to be sent. 943 */ 944 *mpp = m->m_nextpkt; 945 m->m_nextpkt = NULL; 946 if ((m->m_flags & M_HIGHPRI) 947 #ifdef ALTQ 948 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 949 #endif 950 ) { 951 ifq = &sc->sc_fastq; 952 if (IF_QFULL(ifq)) { 953 IF_DROP(ifq); 954 m_freem(m); 955 error = ENOBUFS; 956 } else { 957 IF_ENQUEUE(ifq, m); 958 error = 0; 959 } 960 } else 961 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 962 if (error) { 963 sc->sc_if.if_oerrors++; 964 sc->sc_stats.ppp_oerrors++; 965 } 966 break; 967 968 case NPMODE_DROP: 969 case NPMODE_ERROR: 970 *mpp = m->m_nextpkt; 971 m_freem(m); 972 break; 973 974 case NPMODE_QUEUE: 975 mpp = &m->m_nextpkt; 976 break; 977 } 978 } 979 sc->sc_npqtail = mpp; 980 } 981 982 /* 983 * Transmitter has finished outputting some stuff; 984 * remember to call sc->sc_start later at splsoftnet. 985 */ 986 void 987 ppp_restart(sc) 988 struct ppp_softc *sc; 989 { 990 int s = splimp(); 991 992 sc->sc_flags &= ~SC_TBUSY; 993 schednetisr(NETISR_PPP); 994 splx(s); 995 } 996 997 /* 998 * Get a packet to send. This procedure is intended to be called at 999 * splsoftnet, since it may involve time-consuming operations such as 1000 * applying VJ compression, packet compression, address/control and/or 1001 * protocol field compression to the packet. 1002 */ 1003 struct mbuf * 1004 ppp_dequeue(sc) 1005 struct ppp_softc *sc; 1006 { 1007 struct mbuf *m, *mp; 1008 u_char *cp; 1009 int address, control, protocol; 1010 int s; 1011 1012 /* 1013 * Grab a packet to send: first try the fast queue, then the 1014 * normal queue. 1015 */ 1016 s = splimp(); 1017 IF_DEQUEUE(&sc->sc_fastq, m); 1018 if (m == NULL) 1019 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1020 splx(s); 1021 1022 if (m == NULL) 1023 return NULL; 1024 1025 ++sc->sc_stats.ppp_opackets; 1026 1027 /* 1028 * Extract the ppp header of the new packet. 1029 * The ppp header will be in one mbuf. 1030 */ 1031 cp = mtod(m, u_char *); 1032 address = PPP_ADDRESS(cp); 1033 control = PPP_CONTROL(cp); 1034 protocol = PPP_PROTOCOL(cp); 1035 1036 switch (protocol) { 1037 case PPP_IP: 1038 #ifdef VJC 1039 /* 1040 * If the packet is a TCP/IP packet, see if we can compress it. 1041 */ 1042 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1043 struct ip *ip; 1044 int type; 1045 1046 mp = m; 1047 ip = (struct ip *) (cp + PPP_HDRLEN); 1048 if (mp->m_len <= PPP_HDRLEN) { 1049 mp = mp->m_next; 1050 if (mp == NULL) 1051 break; 1052 ip = mtod(mp, struct ip *); 1053 } 1054 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1055 if (ip->ip_p == IPPROTO_TCP) { 1056 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1057 !(sc->sc_flags & SC_NO_TCP_CCID)); 1058 switch (type) { 1059 case TYPE_UNCOMPRESSED_TCP: 1060 protocol = PPP_VJC_UNCOMP; 1061 break; 1062 case TYPE_COMPRESSED_TCP: 1063 protocol = PPP_VJC_COMP; 1064 cp = mtod(m, u_char *); 1065 cp[0] = address; /* header has moved */ 1066 cp[1] = control; 1067 cp[2] = 0; 1068 break; 1069 } 1070 cp[3] = protocol; /* update protocol in PPP header */ 1071 } 1072 } 1073 #endif /* VJC */ 1074 break; 1075 1076 #ifdef PPP_COMPRESS 1077 case PPP_CCP: 1078 ppp_ccp(sc, m, 0); 1079 break; 1080 #endif /* PPP_COMPRESS */ 1081 } 1082 1083 #ifdef PPP_COMPRESS 1084 if (protocol != PPP_LCP && protocol != PPP_CCP 1085 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1086 struct mbuf *mcomp = NULL; 1087 int slen, clen; 1088 1089 slen = 0; 1090 for (mp = m; mp != NULL; mp = mp->m_next) 1091 slen += mp->m_len; 1092 clen = (*sc->sc_xcomp->compress) 1093 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1094 if (mcomp != NULL) { 1095 if (sc->sc_flags & SC_CCP_UP) { 1096 /* Send the compressed packet instead of the original. */ 1097 m_freem(m); 1098 m = mcomp; 1099 cp = mtod(m, u_char *); 1100 protocol = cp[3]; 1101 } else { 1102 /* Can't transmit compressed packets until CCP is up. */ 1103 m_freem(mcomp); 1104 } 1105 } 1106 } 1107 #endif /* PPP_COMPRESS */ 1108 1109 /* 1110 * Compress the address/control and protocol, if possible. 1111 */ 1112 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1113 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1114 protocol != PPP_LCP) { 1115 /* can compress address/control */ 1116 m->m_data += 2; 1117 m->m_len -= 2; 1118 } 1119 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1120 /* can compress protocol */ 1121 if (mtod(m, u_char *) == cp) { 1122 cp[2] = cp[1]; /* move address/control up */ 1123 cp[1] = cp[0]; 1124 } 1125 ++m->m_data; 1126 --m->m_len; 1127 } 1128 1129 return m; 1130 } 1131 1132 /* 1133 * Software interrupt routine, called at splsoftnet. 1134 */ 1135 void 1136 pppintr() 1137 { 1138 struct ppp_softc *sc; 1139 int i, s, s2; 1140 struct mbuf *m; 1141 1142 sc = ppp_softc; 1143 s = splsoftnet(); 1144 for (i = 0; i < NPPP; ++i, ++sc) { 1145 if (!(sc->sc_flags & SC_TBUSY) 1146 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1147 || sc->sc_outm)) { 1148 s2 = splimp(); 1149 sc->sc_flags |= SC_TBUSY; 1150 splx(s2); 1151 (*sc->sc_start)(sc); 1152 } 1153 for (;;) { 1154 s2 = splimp(); 1155 IF_DEQUEUE(&sc->sc_rawq, m); 1156 splx(s2); 1157 if (m == NULL) 1158 break; 1159 ppp_inproc(sc, m); 1160 } 1161 } 1162 splx(s); 1163 } 1164 1165 #ifdef PPP_COMPRESS 1166 /* 1167 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1168 * 0 if it is about to be transmitted. 1169 */ 1170 static void 1171 ppp_ccp(sc, m, rcvd) 1172 struct ppp_softc *sc; 1173 struct mbuf *m; 1174 int rcvd; 1175 { 1176 u_char *dp, *ep; 1177 struct mbuf *mp; 1178 int slen, s; 1179 1180 /* 1181 * Get a pointer to the data after the PPP header. 1182 */ 1183 if (m->m_len <= PPP_HDRLEN) { 1184 mp = m->m_next; 1185 if (mp == NULL) 1186 return; 1187 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1188 } else { 1189 mp = m; 1190 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1191 } 1192 1193 ep = mtod(mp, u_char *) + mp->m_len; 1194 if (dp + CCP_HDRLEN > ep) 1195 return; 1196 slen = CCP_LENGTH(dp); 1197 if (dp + slen > ep) { 1198 if (sc->sc_flags & SC_DEBUG) 1199 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1200 dp, slen, mtod(mp, u_char *), mp->m_len); 1201 return; 1202 } 1203 1204 switch (CCP_CODE(dp)) { 1205 case CCP_CONFREQ: 1206 case CCP_TERMREQ: 1207 case CCP_TERMACK: 1208 /* CCP must be going down - disable compression */ 1209 if (sc->sc_flags & SC_CCP_UP) { 1210 s = splimp(); 1211 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1212 splx(s); 1213 } 1214 break; 1215 1216 case CCP_CONFACK: 1217 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1218 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1219 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1220 if (!rcvd) { 1221 /* we're agreeing to send compressed packets. */ 1222 if (sc->sc_xc_state != NULL 1223 && (*sc->sc_xcomp->comp_init) 1224 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1225 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1226 s = splimp(); 1227 sc->sc_flags |= SC_COMP_RUN; 1228 splx(s); 1229 } 1230 } else { 1231 /* peer is agreeing to send compressed packets. */ 1232 if (sc->sc_rc_state != NULL 1233 && (*sc->sc_rcomp->decomp_init) 1234 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1235 sc->sc_unit, 0, sc->sc_mru, 1236 sc->sc_flags & SC_DEBUG)) { 1237 s = splimp(); 1238 sc->sc_flags |= SC_DECOMP_RUN; 1239 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1240 splx(s); 1241 } 1242 } 1243 } 1244 break; 1245 1246 case CCP_RESETACK: 1247 if (sc->sc_flags & SC_CCP_UP) { 1248 if (!rcvd) { 1249 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1250 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1251 } else { 1252 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1253 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1254 s = splimp(); 1255 sc->sc_flags &= ~SC_DC_ERROR; 1256 splx(s); 1257 } 1258 } 1259 } 1260 break; 1261 } 1262 } 1263 1264 /* 1265 * CCP is down; free (de)compressor state if necessary. 1266 */ 1267 static void 1268 ppp_ccp_closed(sc) 1269 struct ppp_softc *sc; 1270 { 1271 if (sc->sc_xc_state) { 1272 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1273 sc->sc_xc_state = NULL; 1274 } 1275 if (sc->sc_rc_state) { 1276 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1277 sc->sc_rc_state = NULL; 1278 } 1279 } 1280 #endif /* PPP_COMPRESS */ 1281 1282 /* 1283 * PPP packet input routine. 1284 * The caller has checked and removed the FCS and has inserted 1285 * the address/control bytes and the protocol high byte if they 1286 * were omitted. 1287 */ 1288 void 1289 ppppktin(sc, m, lost) 1290 struct ppp_softc *sc; 1291 struct mbuf *m; 1292 int lost; 1293 { 1294 int s = splimp(); 1295 1296 if (lost) 1297 m->m_flags |= M_ERRMARK; 1298 IF_ENQUEUE(&sc->sc_rawq, m); 1299 schednetisr(NETISR_PPP); 1300 splx(s); 1301 } 1302 1303 /* 1304 * Process a received PPP packet, doing decompression as necessary. 1305 * Should be called at splsoftnet. 1306 */ 1307 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1308 TYPE_UNCOMPRESSED_TCP) 1309 1310 static void 1311 ppp_inproc(sc, m) 1312 struct ppp_softc *sc; 1313 struct mbuf *m; 1314 { 1315 struct ifnet *ifp = &sc->sc_if; 1316 struct ifqueue *inq; 1317 int s, ilen, proto, rv; 1318 u_char *cp, adrs, ctrl; 1319 struct mbuf *mp, *dmp = NULL; 1320 #ifdef VJC 1321 int xlen; 1322 u_char *iphdr; 1323 u_int hlen; 1324 #endif 1325 1326 sc->sc_stats.ppp_ipackets++; 1327 1328 if (sc->sc_flags & SC_LOG_INPKT) { 1329 ilen = 0; 1330 for (mp = m; mp != NULL; mp = mp->m_next) 1331 ilen += mp->m_len; 1332 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1333 pppdumpm(m); 1334 } 1335 1336 cp = mtod(m, u_char *); 1337 adrs = PPP_ADDRESS(cp); 1338 ctrl = PPP_CONTROL(cp); 1339 proto = PPP_PROTOCOL(cp); 1340 1341 if (m->m_flags & M_ERRMARK) { 1342 m->m_flags &= ~M_ERRMARK; 1343 s = splimp(); 1344 sc->sc_flags |= SC_VJ_RESET; 1345 splx(s); 1346 } 1347 1348 #ifdef PPP_COMPRESS 1349 /* 1350 * Decompress this packet if necessary, update the receiver's 1351 * dictionary, or take appropriate action on a CCP packet. 1352 */ 1353 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1354 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1355 /* decompress this packet */ 1356 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1357 if (rv == DECOMP_OK) { 1358 m_freem(m); 1359 if (dmp == NULL) { 1360 /* no error, but no decompressed packet produced */ 1361 return; 1362 } 1363 m = dmp; 1364 cp = mtod(m, u_char *); 1365 proto = PPP_PROTOCOL(cp); 1366 1367 } else { 1368 /* 1369 * An error has occurred in decompression. 1370 * Pass the compressed packet up to pppd, which may take 1371 * CCP down or issue a Reset-Req. 1372 */ 1373 if (sc->sc_flags & SC_DEBUG) 1374 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1375 s = splimp(); 1376 sc->sc_flags |= SC_VJ_RESET; 1377 if (rv == DECOMP_ERROR) 1378 sc->sc_flags |= SC_DC_ERROR; 1379 else 1380 sc->sc_flags |= SC_DC_FERROR; 1381 splx(s); 1382 } 1383 1384 } else { 1385 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1386 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1387 } 1388 if (proto == PPP_CCP) { 1389 ppp_ccp(sc, m, 1); 1390 } 1391 } 1392 #endif 1393 1394 ilen = 0; 1395 for (mp = m; mp != NULL; mp = mp->m_next) 1396 ilen += mp->m_len; 1397 1398 #ifdef VJC 1399 if (sc->sc_flags & SC_VJ_RESET) { 1400 /* 1401 * If we've missed a packet, we must toss subsequent compressed 1402 * packets which don't have an explicit connection ID. 1403 */ 1404 if (sc->sc_comp) 1405 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1406 s = splimp(); 1407 sc->sc_flags &= ~SC_VJ_RESET; 1408 splx(s); 1409 } 1410 1411 /* 1412 * See if we have a VJ-compressed packet to uncompress. 1413 */ 1414 if (proto == PPP_VJC_COMP) { 1415 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1416 goto bad; 1417 1418 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1419 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1420 sc->sc_comp, &iphdr, &hlen); 1421 1422 if (xlen <= 0) { 1423 if (sc->sc_flags & SC_DEBUG) 1424 printf("%s: VJ uncompress failed on type comp\n", 1425 ifp->if_xname); 1426 goto bad; 1427 } 1428 1429 /* Copy the PPP and IP headers into a new mbuf. */ 1430 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1431 if (mp == NULL) 1432 goto bad; 1433 mp->m_len = 0; 1434 mp->m_next = NULL; 1435 if (hlen + PPP_HDRLEN > MHLEN) { 1436 MCLGET(mp, M_DONTWAIT); 1437 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1438 m_freem(mp); 1439 goto bad; /* lose if big headers and no clusters */ 1440 } 1441 } 1442 cp = mtod(mp, u_char *); 1443 cp[0] = adrs; 1444 cp[1] = ctrl; 1445 cp[2] = 0; 1446 cp[3] = PPP_IP; 1447 proto = PPP_IP; 1448 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1449 mp->m_len = hlen + PPP_HDRLEN; 1450 1451 /* 1452 * Trim the PPP and VJ headers off the old mbuf 1453 * and stick the new and old mbufs together. 1454 */ 1455 m->m_data += PPP_HDRLEN + xlen; 1456 m->m_len -= PPP_HDRLEN + xlen; 1457 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1458 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1459 mp->m_len += m->m_len; 1460 MFREE(m, mp->m_next); 1461 } else 1462 mp->m_next = m; 1463 m = mp; 1464 ilen += hlen - xlen; 1465 1466 } else if (proto == PPP_VJC_UNCOMP) { 1467 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1468 goto bad; 1469 1470 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1471 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1472 sc->sc_comp, &iphdr, &hlen); 1473 1474 if (xlen < 0) { 1475 if (sc->sc_flags & SC_DEBUG) 1476 printf("%s: VJ uncompress failed on type uncomp\n", 1477 ifp->if_xname); 1478 goto bad; 1479 } 1480 1481 proto = PPP_IP; 1482 cp[3] = PPP_IP; 1483 } 1484 #endif /* VJC */ 1485 1486 /* 1487 * If the packet will fit in a header mbuf, don't waste a 1488 * whole cluster on it. 1489 */ 1490 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1491 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1492 if (mp != NULL) { 1493 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1494 m_freem(m); 1495 m = mp; 1496 m->m_len = ilen; 1497 } 1498 } 1499 m->m_pkthdr.len = ilen; 1500 m->m_pkthdr.rcvif = ifp; 1501 1502 if ((proto & 0x8000) == 0) { 1503 #ifdef PPP_FILTER 1504 /* 1505 * See whether we want to pass this packet, and 1506 * if it counts as link activity. 1507 */ 1508 if (sc->sc_pass_filt_in.bf_insns != 0 1509 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1510 ilen, 0) == 0) { 1511 /* drop this packet */ 1512 m_freem(m); 1513 return; 1514 } 1515 if (sc->sc_active_filt_in.bf_insns == 0 1516 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1517 ilen, 0)) 1518 sc->sc_last_recv = time.tv_sec; 1519 #else 1520 /* 1521 * Record the time that we received this packet. 1522 */ 1523 sc->sc_last_recv = time.tv_sec; 1524 #endif /* PPP_FILTER */ 1525 } 1526 1527 #if NBPFILTER > 0 1528 /* See if bpf wants to look at the packet. */ 1529 if (sc->sc_if.if_bpf) 1530 bpf_mtap(sc->sc_if.if_bpf, m); 1531 #endif 1532 1533 rv = 0; 1534 switch (proto) { 1535 #ifdef INET 1536 case PPP_IP: 1537 /* 1538 * IP packet - take off the ppp header and pass it up to IP. 1539 */ 1540 if ((ifp->if_flags & IFF_UP) == 0 1541 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1542 /* interface is down - drop the packet. */ 1543 m_freem(m); 1544 return; 1545 } 1546 m->m_pkthdr.len -= PPP_HDRLEN; 1547 m->m_data += PPP_HDRLEN; 1548 m->m_len -= PPP_HDRLEN; 1549 #ifdef GATEWAY 1550 if (ipflow_fastforward(m)) 1551 return; 1552 #endif 1553 schednetisr(NETISR_IP); 1554 inq = &ipintrq; 1555 break; 1556 #endif 1557 1558 #ifdef INET6 1559 case PPP_IPV6: 1560 /* 1561 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1562 */ 1563 if ((ifp->if_flags & IFF_UP) == 0 1564 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1565 /* interface is down - drop the packet. */ 1566 m_freem(m); 1567 return; 1568 } 1569 m->m_pkthdr.len -= PPP_HDRLEN; 1570 m->m_data += PPP_HDRLEN; 1571 m->m_len -= PPP_HDRLEN; 1572 schednetisr(NETISR_IPV6); 1573 inq = &ip6intrq; 1574 break; 1575 #endif 1576 1577 default: 1578 /* 1579 * Some other protocol - place on input queue for read(). 1580 */ 1581 inq = &sc->sc_inq; 1582 rv = 1; 1583 break; 1584 } 1585 1586 /* 1587 * Put the packet on the appropriate input queue. 1588 */ 1589 s = splimp(); 1590 if (IF_QFULL(inq)) { 1591 IF_DROP(inq); 1592 splx(s); 1593 if (sc->sc_flags & SC_DEBUG) 1594 printf("%s: input queue full\n", ifp->if_xname); 1595 ifp->if_iqdrops++; 1596 goto bad; 1597 } 1598 IF_ENQUEUE(inq, m); 1599 splx(s); 1600 ifp->if_ipackets++; 1601 ifp->if_ibytes += ilen; 1602 ifp->if_lastchange = time; 1603 1604 if (rv) 1605 (*sc->sc_ctlp)(sc); 1606 1607 return; 1608 1609 bad: 1610 m_freem(m); 1611 sc->sc_if.if_ierrors++; 1612 sc->sc_stats.ppp_ierrors++; 1613 } 1614 1615 #define MAX_DUMP_BYTES 128 1616 1617 static void 1618 pppdumpm(m0) 1619 struct mbuf *m0; 1620 { 1621 char buf[3*MAX_DUMP_BYTES+4]; 1622 char *bp = buf; 1623 struct mbuf *m; 1624 static char digits[] = "0123456789abcdef"; 1625 1626 for (m = m0; m; m = m->m_next) { 1627 int l = m->m_len; 1628 u_char *rptr = (u_char *)m->m_data; 1629 1630 while (l--) { 1631 if (bp > buf + sizeof(buf) - 4) 1632 goto done; 1633 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1634 *bp++ = digits[*rptr++ & 0xf]; 1635 } 1636 1637 if (m->m_next) { 1638 if (bp > buf + sizeof(buf) - 3) 1639 goto done; 1640 *bp++ = '|'; 1641 } else 1642 *bp++ = ' '; 1643 } 1644 done: 1645 if (m) 1646 *bp++ = '>'; 1647 *bp = 0; 1648 printf("%s\n", buf); 1649 } 1650 1651 #endif /* NPPP > 0 */ 1652
Indexes created Wed Sep 24 22:09:59 GMT 2025