1 /* $NetBSD: if_ppp.c,v 1.55 1999/07/30 10:35:38 itojun 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@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@seismo.ARPA 55 * seismo!rick 56 * 57 * Pounded on heavily by Chris Torek (chris@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@cayman.com) 62 * Added VJ tcp header compression; more unified ioctls 63 * 64 * Extensively modified by Paul Mackerras (paulus@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@cs.anu.edu.au). 73 */ 74 75 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 76 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 77 78 #include "ppp.h" 79 #if NPPP > 0 80 81 #define VJC 82 #define PPP_COMPRESS 83 84 #include "opt_inet.h" 85 #include "opt_gateway.h" 86 #include "opt_ppp.h" 87 88 #include <sys/param.h> 89 #include <sys/proc.h> 90 #include <sys/mbuf.h> 91 #include <sys/socket.h> 92 #include <sys/ioctl.h> 93 #include <sys/kernel.h> 94 #include <sys/systm.h> 95 #include <sys/time.h> 96 #include <sys/malloc.h> 97 98 #include <net/if.h> 99 #include <net/if_types.h> 100 #include <net/netisr.h> 101 #include <net/route.h> 102 #ifdef PPP_FILTER 103 #include <net/bpf.h> 104 #endif 105 106 #ifdef INET 107 #include <netinet/in.h> 108 #include <netinet/in_systm.h> 109 #include <netinet/in_var.h> 110 #include <netinet/ip.h> 111 #else 112 #ifdef _KERNEL 113 #ifdef VJC 114 #error ppp device with VJC assumes INET 115 #endif 116 #endif 117 #endif 118 119 #include "bpfilter.h" 120 #if NBPFILTER > 0 121 #include <sys/time.h> 122 #include <net/bpf.h> 123 #endif 124 125 #if defined(PPP_FILTER) || NBPFILTER > 0 126 #include <net/slip.h> 127 #endif 128 129 #ifdef VJC 130 #include <net/slcompress.h> 131 #endif 132 133 #include <net/ppp_defs.h> 134 #include <net/if_ppp.h> 135 #include <net/if_pppvar.h> 136 #include <machine/cpu.h> 137 138 #ifdef PPP_COMPRESS 139 #define PACKETPTR struct mbuf * 140 #include <net/ppp-comp.h> 141 #endif 142 143 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 144 static void ppp_requeue __P((struct ppp_softc *)); 145 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 146 static void ppp_ccp_closed __P((struct ppp_softc *)); 147 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 148 static void pppdumpm __P((struct mbuf *m0)); 149 150 /* 151 * Some useful mbuf macros not in mbuf.h. 152 */ 153 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 154 155 #define M_DATASTART(m) \ 156 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 157 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 158 159 #define M_DATASIZE(m) \ 160 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 161 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 162 163 /* 164 * We define two link layer specific mbuf flags, to mark high-priority 165 * packets for output, and received packets following lost/corrupted 166 * packets. 167 */ 168 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 169 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 170 171 #ifdef PPP_COMPRESS 172 /* 173 * List of compressors we know about. 174 * We leave some space so maybe we can modload compressors. 175 */ 176 177 extern struct compressor ppp_bsd_compress; 178 extern struct compressor ppp_deflate, ppp_deflate_draft; 179 180 struct compressor *ppp_compressors[8] = { 181 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 182 &ppp_bsd_compress, 183 #endif 184 #if DO_DEFLATE && defined(PPP_DEFLATE) 185 &ppp_deflate, 186 &ppp_deflate_draft, 187 #endif 188 NULL 189 }; 190 #endif /* PPP_COMPRESS */ 191 192 193 /* 194 * Called from boot code to establish ppp interfaces. 195 */ 196 void 197 pppattach() 198 { 199 register struct ppp_softc *sc; 200 register int i = 0; 201 202 for (sc = ppp_softc; i < NPPP; sc++) { 203 sc->sc_unit = i; /* XXX */ 204 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 205 sc->sc_if.if_softc = sc; 206 sc->sc_if.if_mtu = PPP_MTU; 207 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 208 sc->sc_if.if_type = IFT_PPP; 209 sc->sc_if.if_hdrlen = PPP_HDRLEN; 210 sc->sc_if.if_ioctl = pppsioctl; 211 sc->sc_if.if_output = pppoutput; 212 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 213 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 214 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 215 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 216 if_attach(&sc->sc_if); 217 #if NBPFILTER > 0 218 bpfattach(&sc->sc_bpf, &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_MRU && 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 register struct ifnet *ifp; 587 u_long cmd; 588 caddr_t data; 589 { 590 register struct proc *p = curproc; /* XXX */ 591 register struct ppp_softc *sc = ifp->if_softc; 592 register struct ifaddr *ifa = (struct ifaddr *)data; 593 register 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 register struct ppp_softc *sc = ifp->if_softc; 717 int protocol, address, control; 718 u_char *cp; 719 int s, error; 720 struct ip *ip; 721 struct ifqueue *ifq; 722 enum NPmode mode; 723 int len; 724 struct mbuf *m; 725 726 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 727 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 728 error = ENETDOWN; /* sort of */ 729 goto bad; 730 } 731 732 /* 733 * Compute PPP header. 734 */ 735 m0->m_flags &= ~M_HIGHPRI; 736 switch (dst->sa_family) { 737 #ifdef INET 738 case AF_INET: 739 address = PPP_ALLSTATIONS; 740 control = PPP_UI; 741 protocol = PPP_IP; 742 mode = sc->sc_npmode[NP_IP]; 743 744 /* 745 * If this packet has the "low delay" bit set in the IP header, 746 * put it on the fastq instead. 747 */ 748 ip = mtod(m0, struct ip *); 749 if (ip->ip_tos & IPTOS_LOWDELAY) 750 m0->m_flags |= M_HIGHPRI; 751 break; 752 #endif 753 #ifdef INET6 754 case AF_INET6: 755 address = PPP_ALLSTATIONS; /*XXX*/ 756 control = PPP_UI; /*XXX*/ 757 protocol = PPP_IPV6; 758 mode = sc->sc_npmode[NP_IPV6]; 759 760 #if 0 /* XXX flowinfo/traffic class, maybe? */ 761 /* 762 * If this packet has the "low delay" bit set in the IP header, 763 * put it on the fastq instead. 764 */ 765 ip = mtod(m0, struct ip *); 766 if (ip->ip_tos & IPTOS_LOWDELAY) 767 m0->m_flags |= M_HIGHPRI; 768 break; 769 #endif 770 #endif 771 case AF_UNSPEC: 772 address = PPP_ADDRESS(dst->sa_data); 773 control = PPP_CONTROL(dst->sa_data); 774 protocol = PPP_PROTOCOL(dst->sa_data); 775 mode = NPMODE_PASS; 776 break; 777 default: 778 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 779 error = EAFNOSUPPORT; 780 goto bad; 781 } 782 783 /* 784 * Drop this packet, or return an error, if necessary. 785 */ 786 if (mode == NPMODE_ERROR) { 787 error = ENETDOWN; 788 goto bad; 789 } 790 if (mode == NPMODE_DROP) { 791 error = 0; 792 goto bad; 793 } 794 795 /* 796 * Add PPP header. If no space in first mbuf, allocate another. 797 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 798 */ 799 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 800 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 801 if (m0 == 0) { 802 error = ENOBUFS; 803 goto bad; 804 } 805 m0->m_len = 0; 806 } else 807 m0->m_data -= PPP_HDRLEN; 808 809 cp = mtod(m0, u_char *); 810 *cp++ = address; 811 *cp++ = control; 812 *cp++ = protocol >> 8; 813 *cp++ = protocol & 0xff; 814 m0->m_len += PPP_HDRLEN; 815 816 len = 0; 817 for (m = m0; m != 0; m = m->m_next) 818 len += m->m_len; 819 820 if (sc->sc_flags & SC_LOG_OUTPKT) { 821 printf("%s output: ", ifp->if_xname); 822 pppdumpm(m0); 823 } 824 825 if ((protocol & 0x8000) == 0) { 826 #ifdef PPP_FILTER 827 /* 828 * Apply the pass and active filters to the packet, 829 * but only if it is a data packet. 830 */ 831 if (sc->sc_pass_filt_out.bf_insns != 0 832 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 833 len, 0) == 0) { 834 error = 0; /* drop this packet */ 835 goto bad; 836 } 837 838 /* 839 * Update the time we sent the most recent packet. 840 */ 841 if (sc->sc_active_filt_out.bf_insns == 0 842 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 843 len, 0)) 844 sc->sc_last_sent = time.tv_sec; 845 #else 846 /* 847 * Update the time we sent the most recent packet. 848 */ 849 sc->sc_last_sent = time.tv_sec; 850 #endif /* PPP_FILTER */ 851 } 852 853 #if NBPFILTER > 0 854 /* 855 * See if bpf wants to look at the packet. 856 */ 857 if (sc->sc_bpf) 858 bpf_mtap(sc->sc_bpf, m0); 859 #endif 860 861 /* 862 * Put the packet on the appropriate queue. 863 */ 864 s = splimp(); 865 if (mode == NPMODE_QUEUE) { 866 /* XXX we should limit the number of packets on this queue */ 867 *sc->sc_npqtail = m0; 868 m0->m_nextpkt = NULL; 869 sc->sc_npqtail = &m0->m_nextpkt; 870 } else { 871 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 872 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 873 IF_DROP(ifq); 874 splx(s); 875 sc->sc_if.if_oerrors++; 876 sc->sc_stats.ppp_oerrors++; 877 error = ENOBUFS; 878 goto bad; 879 } 880 IF_ENQUEUE(ifq, m0); 881 ppp_restart(sc); 882 } 883 ifp->if_lastchange = time; 884 ifp->if_opackets++; 885 ifp->if_obytes += len; 886 887 splx(s); 888 return (0); 889 890 bad: 891 m_freem(m0); 892 return (error); 893 } 894 895 /* 896 * After a change in the NPmode for some NP, move packets from the 897 * npqueue to the send queue or the fast queue as appropriate. 898 * Should be called at splimp, since we muck with the queues. 899 */ 900 static void 901 ppp_requeue(sc) 902 struct ppp_softc *sc; 903 { 904 struct mbuf *m, **mpp; 905 struct ifqueue *ifq; 906 enum NPmode mode; 907 908 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 909 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 910 case PPP_IP: 911 mode = sc->sc_npmode[NP_IP]; 912 break; 913 case PPP_IPV6: 914 mode = sc->sc_npmode[NP_IPV6]; 915 break; 916 default: 917 mode = NPMODE_PASS; 918 } 919 920 switch (mode) { 921 case NPMODE_PASS: 922 /* 923 * This packet can now go on one of the queues to be sent. 924 */ 925 *mpp = m->m_nextpkt; 926 m->m_nextpkt = NULL; 927 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 928 if (IF_QFULL(ifq)) { 929 IF_DROP(ifq); 930 sc->sc_if.if_oerrors++; 931 sc->sc_stats.ppp_oerrors++; 932 } else 933 IF_ENQUEUE(ifq, m); 934 break; 935 936 case NPMODE_DROP: 937 case NPMODE_ERROR: 938 *mpp = m->m_nextpkt; 939 m_freem(m); 940 break; 941 942 case NPMODE_QUEUE: 943 mpp = &m->m_nextpkt; 944 break; 945 } 946 } 947 sc->sc_npqtail = mpp; 948 } 949 950 /* 951 * Transmitter has finished outputting some stuff; 952 * remember to call sc->sc_start later at splsoftnet. 953 */ 954 void 955 ppp_restart(sc) 956 struct ppp_softc *sc; 957 { 958 int s = splimp(); 959 960 sc->sc_flags &= ~SC_TBUSY; 961 schednetisr(NETISR_PPP); 962 splx(s); 963 } 964 965 /* 966 * Get a packet to send. This procedure is intended to be called at 967 * splsoftnet, since it may involve time-consuming operations such as 968 * applying VJ compression, packet compression, address/control and/or 969 * protocol field compression to the packet. 970 */ 971 struct mbuf * 972 ppp_dequeue(sc) 973 struct ppp_softc *sc; 974 { 975 struct mbuf *m, *mp; 976 u_char *cp; 977 int address, control, protocol; 978 int s; 979 980 /* 981 * Grab a packet to send: first try the fast queue, then the 982 * normal queue. 983 */ 984 s = splimp(); 985 IF_DEQUEUE(&sc->sc_fastq, m); 986 if (m == NULL) 987 IF_DEQUEUE(&sc->sc_if.if_snd, m); 988 splx(s); 989 990 if (m == NULL) 991 return NULL; 992 993 ++sc->sc_stats.ppp_opackets; 994 995 /* 996 * Extract the ppp header of the new packet. 997 * The ppp header will be in one mbuf. 998 */ 999 cp = mtod(m, u_char *); 1000 address = PPP_ADDRESS(cp); 1001 control = PPP_CONTROL(cp); 1002 protocol = PPP_PROTOCOL(cp); 1003 1004 switch (protocol) { 1005 case PPP_IP: 1006 #ifdef VJC 1007 /* 1008 * If the packet is a TCP/IP packet, see if we can compress it. 1009 */ 1010 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1011 struct ip *ip; 1012 int type; 1013 1014 mp = m; 1015 ip = (struct ip *) (cp + PPP_HDRLEN); 1016 if (mp->m_len <= PPP_HDRLEN) { 1017 mp = mp->m_next; 1018 if (mp == NULL) 1019 break; 1020 ip = mtod(mp, struct ip *); 1021 } 1022 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1023 if (ip->ip_p == IPPROTO_TCP) { 1024 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1025 !(sc->sc_flags & SC_NO_TCP_CCID)); 1026 switch (type) { 1027 case TYPE_UNCOMPRESSED_TCP: 1028 protocol = PPP_VJC_UNCOMP; 1029 break; 1030 case TYPE_COMPRESSED_TCP: 1031 protocol = PPP_VJC_COMP; 1032 cp = mtod(m, u_char *); 1033 cp[0] = address; /* header has moved */ 1034 cp[1] = control; 1035 cp[2] = 0; 1036 break; 1037 } 1038 cp[3] = protocol; /* update protocol in PPP header */ 1039 } 1040 } 1041 #endif /* VJC */ 1042 break; 1043 1044 #ifdef PPP_COMPRESS 1045 case PPP_CCP: 1046 ppp_ccp(sc, m, 0); 1047 break; 1048 #endif /* PPP_COMPRESS */ 1049 } 1050 1051 #ifdef PPP_COMPRESS 1052 if (protocol != PPP_LCP && protocol != PPP_CCP 1053 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1054 struct mbuf *mcomp = NULL; 1055 int slen, clen; 1056 1057 slen = 0; 1058 for (mp = m; mp != NULL; mp = mp->m_next) 1059 slen += mp->m_len; 1060 clen = (*sc->sc_xcomp->compress) 1061 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1062 if (mcomp != NULL) { 1063 if (sc->sc_flags & SC_CCP_UP) { 1064 /* Send the compressed packet instead of the original. */ 1065 m_freem(m); 1066 m = mcomp; 1067 cp = mtod(m, u_char *); 1068 protocol = cp[3]; 1069 } else { 1070 /* Can't transmit compressed packets until CCP is up. */ 1071 m_freem(mcomp); 1072 } 1073 } 1074 } 1075 #endif /* PPP_COMPRESS */ 1076 1077 /* 1078 * Compress the address/control and protocol, if possible. 1079 */ 1080 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1081 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1082 protocol != PPP_LCP) { 1083 /* can compress address/control */ 1084 m->m_data += 2; 1085 m->m_len -= 2; 1086 } 1087 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1088 /* can compress protocol */ 1089 if (mtod(m, u_char *) == cp) { 1090 cp[2] = cp[1]; /* move address/control up */ 1091 cp[1] = cp[0]; 1092 } 1093 ++m->m_data; 1094 --m->m_len; 1095 } 1096 1097 return m; 1098 } 1099 1100 /* 1101 * Software interrupt routine, called at splsoftnet. 1102 */ 1103 void 1104 pppintr() 1105 { 1106 struct ppp_softc *sc; 1107 int i, s, s2; 1108 struct mbuf *m; 1109 1110 sc = ppp_softc; 1111 s = splsoftnet(); 1112 for (i = 0; i < NPPP; ++i, ++sc) { 1113 if (!(sc->sc_flags & SC_TBUSY) 1114 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head 1115 || sc->sc_outm)) { 1116 s2 = splimp(); 1117 sc->sc_flags |= SC_TBUSY; 1118 splx(s2); 1119 (*sc->sc_start)(sc); 1120 } 1121 for (;;) { 1122 s2 = splimp(); 1123 IF_DEQUEUE(&sc->sc_rawq, m); 1124 splx(s2); 1125 if (m == NULL) 1126 break; 1127 ppp_inproc(sc, m); 1128 } 1129 } 1130 splx(s); 1131 } 1132 1133 #ifdef PPP_COMPRESS 1134 /* 1135 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1136 * 0 if it is about to be transmitted. 1137 */ 1138 static void 1139 ppp_ccp(sc, m, rcvd) 1140 struct ppp_softc *sc; 1141 struct mbuf *m; 1142 int rcvd; 1143 { 1144 u_char *dp, *ep; 1145 struct mbuf *mp; 1146 int slen, s; 1147 1148 /* 1149 * Get a pointer to the data after the PPP header. 1150 */ 1151 if (m->m_len <= PPP_HDRLEN) { 1152 mp = m->m_next; 1153 if (mp == NULL) 1154 return; 1155 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1156 } else { 1157 mp = m; 1158 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1159 } 1160 1161 ep = mtod(mp, u_char *) + mp->m_len; 1162 if (dp + CCP_HDRLEN > ep) 1163 return; 1164 slen = CCP_LENGTH(dp); 1165 if (dp + slen > ep) { 1166 if (sc->sc_flags & SC_DEBUG) 1167 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1168 dp, slen, mtod(mp, u_char *), mp->m_len); 1169 return; 1170 } 1171 1172 switch (CCP_CODE(dp)) { 1173 case CCP_CONFREQ: 1174 case CCP_TERMREQ: 1175 case CCP_TERMACK: 1176 /* CCP must be going down - disable compression */ 1177 if (sc->sc_flags & SC_CCP_UP) { 1178 s = splimp(); 1179 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1180 splx(s); 1181 } 1182 break; 1183 1184 case CCP_CONFACK: 1185 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1186 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1187 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1188 if (!rcvd) { 1189 /* we're agreeing to send compressed packets. */ 1190 if (sc->sc_xc_state != NULL 1191 && (*sc->sc_xcomp->comp_init) 1192 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1193 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1194 s = splimp(); 1195 sc->sc_flags |= SC_COMP_RUN; 1196 splx(s); 1197 } 1198 } else { 1199 /* peer is agreeing to send compressed packets. */ 1200 if (sc->sc_rc_state != NULL 1201 && (*sc->sc_rcomp->decomp_init) 1202 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1203 sc->sc_unit, 0, sc->sc_mru, 1204 sc->sc_flags & SC_DEBUG)) { 1205 s = splimp(); 1206 sc->sc_flags |= SC_DECOMP_RUN; 1207 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1208 splx(s); 1209 } 1210 } 1211 } 1212 break; 1213 1214 case CCP_RESETACK: 1215 if (sc->sc_flags & SC_CCP_UP) { 1216 if (!rcvd) { 1217 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1218 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1219 } else { 1220 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1221 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1222 s = splimp(); 1223 sc->sc_flags &= ~SC_DC_ERROR; 1224 splx(s); 1225 } 1226 } 1227 } 1228 break; 1229 } 1230 } 1231 1232 /* 1233 * CCP is down; free (de)compressor state if necessary. 1234 */ 1235 static void 1236 ppp_ccp_closed(sc) 1237 struct ppp_softc *sc; 1238 { 1239 if (sc->sc_xc_state) { 1240 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1241 sc->sc_xc_state = NULL; 1242 } 1243 if (sc->sc_rc_state) { 1244 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1245 sc->sc_rc_state = NULL; 1246 } 1247 } 1248 #endif /* PPP_COMPRESS */ 1249 1250 /* 1251 * PPP packet input routine. 1252 * The caller has checked and removed the FCS and has inserted 1253 * the address/control bytes and the protocol high byte if they 1254 * were omitted. 1255 */ 1256 void 1257 ppppktin(sc, m, lost) 1258 struct ppp_softc *sc; 1259 struct mbuf *m; 1260 int lost; 1261 { 1262 int s = splimp(); 1263 1264 if (lost) 1265 m->m_flags |= M_ERRMARK; 1266 IF_ENQUEUE(&sc->sc_rawq, m); 1267 schednetisr(NETISR_PPP); 1268 splx(s); 1269 } 1270 1271 /* 1272 * Process a received PPP packet, doing decompression as necessary. 1273 * Should be called at splsoftnet. 1274 */ 1275 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1276 TYPE_UNCOMPRESSED_TCP) 1277 1278 static void 1279 ppp_inproc(sc, m) 1280 struct ppp_softc *sc; 1281 struct mbuf *m; 1282 { 1283 struct ifnet *ifp = &sc->sc_if; 1284 struct ifqueue *inq; 1285 int s, ilen, xlen, proto, rv; 1286 u_char *cp, adrs, ctrl; 1287 struct mbuf *mp, *dmp = NULL; 1288 u_char *iphdr; 1289 u_int hlen; 1290 1291 sc->sc_stats.ppp_ipackets++; 1292 1293 if (sc->sc_flags & SC_LOG_INPKT) { 1294 ilen = 0; 1295 for (mp = m; mp != NULL; mp = mp->m_next) 1296 ilen += mp->m_len; 1297 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1298 pppdumpm(m); 1299 } 1300 1301 cp = mtod(m, u_char *); 1302 adrs = PPP_ADDRESS(cp); 1303 ctrl = PPP_CONTROL(cp); 1304 proto = PPP_PROTOCOL(cp); 1305 1306 if (m->m_flags & M_ERRMARK) { 1307 m->m_flags &= ~M_ERRMARK; 1308 s = splimp(); 1309 sc->sc_flags |= SC_VJ_RESET; 1310 splx(s); 1311 } 1312 1313 #ifdef PPP_COMPRESS 1314 /* 1315 * Decompress this packet if necessary, update the receiver's 1316 * dictionary, or take appropriate action on a CCP packet. 1317 */ 1318 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1319 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1320 /* decompress this packet */ 1321 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1322 if (rv == DECOMP_OK) { 1323 m_freem(m); 1324 if (dmp == NULL) { 1325 /* no error, but no decompressed packet produced */ 1326 return; 1327 } 1328 m = dmp; 1329 cp = mtod(m, u_char *); 1330 proto = PPP_PROTOCOL(cp); 1331 1332 } else { 1333 /* 1334 * An error has occurred in decompression. 1335 * Pass the compressed packet up to pppd, which may take 1336 * CCP down or issue a Reset-Req. 1337 */ 1338 if (sc->sc_flags & SC_DEBUG) 1339 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1340 s = splimp(); 1341 sc->sc_flags |= SC_VJ_RESET; 1342 if (rv == DECOMP_ERROR) 1343 sc->sc_flags |= SC_DC_ERROR; 1344 else 1345 sc->sc_flags |= SC_DC_FERROR; 1346 splx(s); 1347 } 1348 1349 } else { 1350 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1351 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1352 } 1353 if (proto == PPP_CCP) { 1354 ppp_ccp(sc, m, 1); 1355 } 1356 } 1357 #endif 1358 1359 ilen = 0; 1360 for (mp = m; mp != NULL; mp = mp->m_next) 1361 ilen += mp->m_len; 1362 1363 #ifdef VJC 1364 if (sc->sc_flags & SC_VJ_RESET) { 1365 /* 1366 * If we've missed a packet, we must toss subsequent compressed 1367 * packets which don't have an explicit connection ID. 1368 */ 1369 if (sc->sc_comp) 1370 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1371 s = splimp(); 1372 sc->sc_flags &= ~SC_VJ_RESET; 1373 splx(s); 1374 } 1375 1376 /* 1377 * See if we have a VJ-compressed packet to uncompress. 1378 */ 1379 if (proto == PPP_VJC_COMP) { 1380 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1381 goto bad; 1382 1383 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1384 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1385 sc->sc_comp, &iphdr, &hlen); 1386 1387 if (xlen <= 0) { 1388 if (sc->sc_flags & SC_DEBUG) 1389 printf("%s: VJ uncompress failed on type comp\n", 1390 ifp->if_xname); 1391 goto bad; 1392 } 1393 1394 /* Copy the PPP and IP headers into a new mbuf. */ 1395 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1396 if (mp == NULL) 1397 goto bad; 1398 mp->m_len = 0; 1399 mp->m_next = NULL; 1400 if (hlen + PPP_HDRLEN > MHLEN) { 1401 MCLGET(mp, M_DONTWAIT); 1402 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1403 m_freem(mp); 1404 goto bad; /* lose if big headers and no clusters */ 1405 } 1406 } 1407 cp = mtod(mp, u_char *); 1408 cp[0] = adrs; 1409 cp[1] = ctrl; 1410 cp[2] = 0; 1411 cp[3] = PPP_IP; 1412 proto = PPP_IP; 1413 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1414 mp->m_len = hlen + PPP_HDRLEN; 1415 1416 /* 1417 * Trim the PPP and VJ headers off the old mbuf 1418 * and stick the new and old mbufs together. 1419 */ 1420 m->m_data += PPP_HDRLEN + xlen; 1421 m->m_len -= PPP_HDRLEN + xlen; 1422 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1423 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1424 mp->m_len += m->m_len; 1425 MFREE(m, mp->m_next); 1426 } else 1427 mp->m_next = m; 1428 m = mp; 1429 ilen += hlen - xlen; 1430 1431 } else if (proto == PPP_VJC_UNCOMP) { 1432 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1433 goto bad; 1434 1435 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1436 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1437 sc->sc_comp, &iphdr, &hlen); 1438 1439 if (xlen < 0) { 1440 if (sc->sc_flags & SC_DEBUG) 1441 printf("%s: VJ uncompress failed on type uncomp\n", 1442 ifp->if_xname); 1443 goto bad; 1444 } 1445 1446 proto = PPP_IP; 1447 cp[3] = PPP_IP; 1448 } 1449 #endif /* VJC */ 1450 1451 /* 1452 * If the packet will fit in a header mbuf, don't waste a 1453 * whole cluster on it. 1454 */ 1455 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1456 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1457 if (mp != NULL) { 1458 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1459 m_freem(m); 1460 m = mp; 1461 m->m_len = ilen; 1462 } 1463 } 1464 m->m_pkthdr.len = ilen; 1465 m->m_pkthdr.rcvif = ifp; 1466 1467 if ((proto & 0x8000) == 0) { 1468 #ifdef PPP_FILTER 1469 /* 1470 * See whether we want to pass this packet, and 1471 * if it counts as link activity. 1472 */ 1473 if (sc->sc_pass_filt_in.bf_insns != 0 1474 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1475 ilen, 0) == 0) { 1476 /* drop this packet */ 1477 m_freem(m); 1478 return; 1479 } 1480 if (sc->sc_active_filt_in.bf_insns == 0 1481 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1482 ilen, 0)) 1483 sc->sc_last_recv = time.tv_sec; 1484 #else 1485 /* 1486 * Record the time that we received this packet. 1487 */ 1488 sc->sc_last_recv = time.tv_sec; 1489 #endif /* PPP_FILTER */ 1490 } 1491 1492 #if NBPFILTER > 0 1493 /* See if bpf wants to look at the packet. */ 1494 if (sc->sc_bpf) 1495 bpf_mtap(sc->sc_bpf, m); 1496 #endif 1497 1498 rv = 0; 1499 switch (proto) { 1500 #ifdef INET 1501 case PPP_IP: 1502 /* 1503 * IP packet - take off the ppp header and pass it up to IP. 1504 */ 1505 if ((ifp->if_flags & IFF_UP) == 0 1506 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1507 /* interface is down - drop the packet. */ 1508 m_freem(m); 1509 return; 1510 } 1511 m->m_pkthdr.len -= PPP_HDRLEN; 1512 m->m_data += PPP_HDRLEN; 1513 m->m_len -= PPP_HDRLEN; 1514 #ifdef GATEWAY 1515 if (ipflow_fastforward(m)) 1516 return; 1517 #endif 1518 schednetisr(NETISR_IP); 1519 inq = &ipintrq; 1520 break; 1521 #endif 1522 1523 #ifdef INET6 1524 case PPP_IPV6: 1525 /* 1526 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1527 */ 1528 if ((ifp->if_flags & IFF_UP) == 0 1529 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1530 /* interface is down - drop the packet. */ 1531 m_freem(m); 1532 return; 1533 } 1534 m->m_pkthdr.len -= PPP_HDRLEN; 1535 m->m_data += PPP_HDRLEN; 1536 m->m_len -= PPP_HDRLEN; 1537 schednetisr(NETISR_IPV6); 1538 inq = &ip6intrq; 1539 break; 1540 #endif 1541 1542 default: 1543 /* 1544 * Some other protocol - place on input queue for read(). 1545 */ 1546 inq = &sc->sc_inq; 1547 rv = 1; 1548 break; 1549 } 1550 1551 /* 1552 * Put the packet on the appropriate input queue. 1553 */ 1554 s = splimp(); 1555 if (IF_QFULL(inq)) { 1556 IF_DROP(inq); 1557 splx(s); 1558 if (sc->sc_flags & SC_DEBUG) 1559 printf("%s: input queue full\n", ifp->if_xname); 1560 ifp->if_iqdrops++; 1561 goto bad; 1562 } 1563 IF_ENQUEUE(inq, m); 1564 splx(s); 1565 ifp->if_ipackets++; 1566 ifp->if_ibytes += ilen; 1567 ifp->if_lastchange = time; 1568 1569 if (rv) 1570 (*sc->sc_ctlp)(sc); 1571 1572 return; 1573 1574 bad: 1575 m_freem(m); 1576 sc->sc_if.if_ierrors++; 1577 sc->sc_stats.ppp_ierrors++; 1578 } 1579 1580 #define MAX_DUMP_BYTES 128 1581 1582 static void 1583 pppdumpm(m0) 1584 struct mbuf *m0; 1585 { 1586 char buf[3*MAX_DUMP_BYTES+4]; 1587 char *bp = buf; 1588 struct mbuf *m; 1589 static char digits[] = "0123456789abcdef"; 1590 1591 for (m = m0; m; m = m->m_next) { 1592 int l = m->m_len; 1593 u_char *rptr = (u_char *)m->m_data; 1594 1595 while (l--) { 1596 if (bp > buf + sizeof(buf) - 4) 1597 goto done; 1598 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1599 *bp++ = digits[*rptr++ & 0xf]; 1600 } 1601 1602 if (m->m_next) { 1603 if (bp > buf + sizeof(buf) - 3) 1604 goto done; 1605 *bp++ = '|'; 1606 } else 1607 *bp++ = ' '; 1608 } 1609 done: 1610 if (m) 1611 *bp++ = '>'; 1612 *bp = 0; 1613 printf("%s\n", buf); 1614 } 1615 1616 #endif /* NPPP > 0 */ 1617