if_ppp.c revision 1.55.2.5
1 /* $NetBSD: if_ppp.c,v 1.55.2.5 2001/01/18 09:23:51 bouyer 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 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 110 #include <machine/intr.h> 111 #endif 112 113 #include <netinet/in.h> 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #ifdef INET 117 #include <netinet/ip.h> 118 #endif 119 120 #include "bpfilter.h" 121 #if NBPFILTER > 0 122 #include <sys/time.h> 123 #include <net/bpf.h> 124 #endif 125 126 #if defined(PPP_FILTER) || NBPFILTER > 0 127 #include <net/slip.h> 128 #endif 129 130 #ifdef VJC 131 #include <net/slcompress.h> 132 #endif 133 134 #include <net/ppp_defs.h> 135 #include <net/if_ppp.h> 136 #include <net/if_pppvar.h> 137 #include <machine/cpu.h> 138 139 #ifdef PPP_COMPRESS 140 #define PACKETPTR struct mbuf * 141 #include <net/ppp-comp.h> 142 #endif 143 144 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 145 static void ppp_requeue __P((struct ppp_softc *)); 146 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 147 static void ppp_ccp_closed __P((struct ppp_softc *)); 148 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 149 static void pppdumpm __P((struct mbuf *m0)); 150 151 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 152 void pppnetisr(void); 153 #endif 154 void pppintr(void *); 155 156 /* 157 * Some useful mbuf macros not in mbuf.h. 158 */ 159 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 160 161 #define M_DATASTART(m) \ 162 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 163 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 164 165 #define M_DATASIZE(m) \ 166 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 167 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 168 169 /* 170 * We define two link layer specific mbuf flags, to mark high-priority 171 * packets for output, and received packets following lost/corrupted 172 * packets. 173 */ 174 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 175 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 176 177 #ifdef PPP_COMPRESS 178 /* 179 * List of compressors we know about. 180 * We leave some space so maybe we can modload compressors. 181 */ 182 183 extern struct compressor ppp_bsd_compress; 184 extern struct compressor ppp_deflate, ppp_deflate_draft; 185 186 struct compressor *ppp_compressors[8] = { 187 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 188 &ppp_bsd_compress, 189 #endif 190 #if DO_DEFLATE && defined(PPP_DEFLATE) 191 &ppp_deflate, 192 &ppp_deflate_draft, 193 #endif 194 NULL 195 }; 196 #endif /* PPP_COMPRESS */ 197 198 199 /* 200 * Called from boot code to establish ppp interfaces. 201 */ 202 void 203 pppattach() 204 { 205 struct ppp_softc *sc; 206 int i = 0; 207 208 for (sc = ppp_softc; i < NPPP; sc++) { 209 sc->sc_unit = i; /* XXX */ 210 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 211 callout_init(&sc->sc_timo_ch); 212 sc->sc_if.if_softc = sc; 213 sc->sc_if.if_mtu = PPP_MTU; 214 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 215 sc->sc_if.if_type = IFT_PPP; 216 sc->sc_if.if_hdrlen = PPP_HDRLEN; 217 sc->sc_if.if_dlt = DLT_NULL; 218 sc->sc_if.if_ioctl = pppsioctl; 219 sc->sc_if.if_output = pppoutput; 220 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 221 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 222 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 223 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 224 IFQ_SET_READY(&sc->sc_if.if_snd); 225 if_attach(&sc->sc_if); 226 if_alloc_sadl(&sc->sc_if); 227 #if NBPFILTER > 0 228 bpfattach(&sc->sc_if, DLT_NULL, 0); 229 #endif 230 } 231 } 232 233 /* 234 * Allocate a ppp interface unit and initialize it. 235 */ 236 struct ppp_softc * 237 pppalloc(pid) 238 pid_t pid; 239 { 240 int nppp, i; 241 struct ppp_softc *sc; 242 243 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 244 if (sc->sc_xfer == pid) { 245 sc->sc_xfer = 0; 246 return sc; 247 } 248 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 249 if (sc->sc_devp == NULL) 250 break; 251 if (nppp >= NPPP) 252 return NULL; 253 254 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 255 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 256 if (sc->sc_si == NULL) { 257 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 258 return (NULL); 259 } 260 #endif 261 262 sc->sc_flags = 0; 263 sc->sc_mru = PPP_MRU; 264 sc->sc_relinq = NULL; 265 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 266 #ifdef VJC 267 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 268 M_DEVBUF, M_NOWAIT); 269 if (sc->sc_comp) 270 sl_compress_init(sc->sc_comp); 271 #endif 272 #ifdef PPP_COMPRESS 273 sc->sc_xc_state = NULL; 274 sc->sc_rc_state = NULL; 275 #endif /* PPP_COMPRESS */ 276 for (i = 0; i < NUM_NP; ++i) 277 sc->sc_npmode[i] = NPMODE_ERROR; 278 sc->sc_npqueue = NULL; 279 sc->sc_npqtail = &sc->sc_npqueue; 280 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 281 282 return sc; 283 } 284 285 /* 286 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 287 */ 288 void 289 pppdealloc(sc) 290 struct ppp_softc *sc; 291 { 292 struct mbuf *m; 293 294 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 295 softintr_disestablish(sc->sc_si); 296 #endif 297 if_down(&sc->sc_if); 298 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 299 sc->sc_devp = NULL; 300 sc->sc_xfer = 0; 301 for (;;) { 302 IF_DEQUEUE(&sc->sc_rawq, m); 303 if (m == NULL) 304 break; 305 m_freem(m); 306 } 307 for (;;) { 308 IF_DEQUEUE(&sc->sc_inq, m); 309 if (m == NULL) 310 break; 311 m_freem(m); 312 } 313 for (;;) { 314 IF_DEQUEUE(&sc->sc_fastq, m); 315 if (m == NULL) 316 break; 317 m_freem(m); 318 } 319 while ((m = sc->sc_npqueue) != NULL) { 320 sc->sc_npqueue = m->m_nextpkt; 321 m_freem(m); 322 } 323 if (sc->sc_togo != NULL) { 324 m_freem(sc->sc_togo); 325 sc->sc_togo = NULL; 326 } 327 #ifdef PPP_COMPRESS 328 ppp_ccp_closed(sc); 329 sc->sc_xc_state = NULL; 330 sc->sc_rc_state = NULL; 331 #endif /* PPP_COMPRESS */ 332 #ifdef PPP_FILTER 333 if (sc->sc_pass_filt_in.bf_insns != 0) { 334 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 335 sc->sc_pass_filt_in.bf_insns = 0; 336 sc->sc_pass_filt_in.bf_len = 0; 337 } 338 if (sc->sc_pass_filt_out.bf_insns != 0) { 339 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 340 sc->sc_pass_filt_out.bf_insns = 0; 341 sc->sc_pass_filt_out.bf_len = 0; 342 } 343 if (sc->sc_active_filt_in.bf_insns != 0) { 344 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 345 sc->sc_active_filt_in.bf_insns = 0; 346 sc->sc_active_filt_in.bf_len = 0; 347 } 348 if (sc->sc_active_filt_out.bf_insns != 0) { 349 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 350 sc->sc_active_filt_out.bf_insns = 0; 351 sc->sc_active_filt_out.bf_len = 0; 352 } 353 #endif /* PPP_FILTER */ 354 #ifdef VJC 355 if (sc->sc_comp != 0) { 356 FREE(sc->sc_comp, M_DEVBUF); 357 sc->sc_comp = 0; 358 } 359 #endif 360 } 361 362 /* 363 * Ioctl routine for generic ppp devices. 364 */ 365 int 366 pppioctl(sc, cmd, data, flag, p) 367 struct ppp_softc *sc; 368 u_long cmd; 369 caddr_t data; 370 int flag; 371 struct proc *p; 372 { 373 int s, error, flags, mru, nb, npx; 374 struct ppp_option_data *odp; 375 struct compressor **cp; 376 struct npioctl *npi; 377 time_t t; 378 #ifdef PPP_FILTER 379 struct bpf_program *bp, *nbp; 380 struct bpf_insn *newcode, *oldcode; 381 int newcodelen; 382 #endif /* PPP_FILTER */ 383 #ifdef PPP_COMPRESS 384 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 385 #endif 386 387 switch (cmd) { 388 case FIONREAD: 389 *(int *)data = sc->sc_inq.ifq_len; 390 break; 391 392 case PPPIOCGUNIT: 393 *(int *)data = sc->sc_unit; /* XXX */ 394 break; 395 396 case PPPIOCGFLAGS: 397 *(u_int *)data = sc->sc_flags; 398 break; 399 400 case PPPIOCSFLAGS: 401 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 402 return (error); 403 flags = *(int *)data & SC_MASK; 404 s = splsoftnet(); 405 #ifdef PPP_COMPRESS 406 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 407 ppp_ccp_closed(sc); 408 #endif 409 splimp(); 410 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 411 splx(s); 412 break; 413 414 case PPPIOCSMRU: 415 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 416 return (error); 417 mru = *(int *)data; 418 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 419 sc->sc_mru = mru; 420 break; 421 422 case PPPIOCGMRU: 423 *(int *)data = sc->sc_mru; 424 break; 425 426 #ifdef VJC 427 case PPPIOCSMAXCID: 428 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 429 return (error); 430 if (sc->sc_comp) { 431 s = splsoftnet(); 432 sl_compress_setup(sc->sc_comp, *(int *)data); 433 splx(s); 434 } 435 break; 436 #endif 437 438 case PPPIOCXFERUNIT: 439 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 440 return (error); 441 sc->sc_xfer = p->p_pid; 442 break; 443 444 #ifdef PPP_COMPRESS 445 case PPPIOCSCOMPRESS: 446 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 447 return (error); 448 odp = (struct ppp_option_data *) data; 449 nb = odp->length; 450 if (nb > sizeof(ccp_option)) 451 nb = sizeof(ccp_option); 452 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 453 return (error); 454 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 455 return (EINVAL); 456 for (cp = ppp_compressors; *cp != NULL; ++cp) 457 if ((*cp)->compress_proto == ccp_option[0]) { 458 /* 459 * Found a handler for the protocol - try to allocate 460 * a compressor or decompressor. 461 */ 462 error = 0; 463 if (odp->transmit) { 464 s = splsoftnet(); 465 if (sc->sc_xc_state != NULL) 466 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 467 sc->sc_xcomp = *cp; 468 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 469 if (sc->sc_xc_state == NULL) { 470 if (sc->sc_flags & SC_DEBUG) 471 printf("%s: comp_alloc failed\n", 472 sc->sc_if.if_xname); 473 error = ENOBUFS; 474 } 475 splimp(); 476 sc->sc_flags &= ~SC_COMP_RUN; 477 splx(s); 478 } else { 479 s = splsoftnet(); 480 if (sc->sc_rc_state != NULL) 481 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 482 sc->sc_rcomp = *cp; 483 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 484 if (sc->sc_rc_state == NULL) { 485 if (sc->sc_flags & SC_DEBUG) 486 printf("%s: decomp_alloc failed\n", 487 sc->sc_if.if_xname); 488 error = ENOBUFS; 489 } 490 splimp(); 491 sc->sc_flags &= ~SC_DECOMP_RUN; 492 splx(s); 493 } 494 return (error); 495 } 496 if (sc->sc_flags & SC_DEBUG) 497 printf("%s: no compressor for [%x %x %x], %x\n", 498 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 499 ccp_option[2], nb); 500 return (EINVAL); /* no handler found */ 501 #endif /* PPP_COMPRESS */ 502 503 case PPPIOCGNPMODE: 504 case PPPIOCSNPMODE: 505 npi = (struct npioctl *) data; 506 switch (npi->protocol) { 507 case PPP_IP: 508 npx = NP_IP; 509 break; 510 case PPP_IPV6: 511 npx = NP_IPV6; 512 break; 513 default: 514 return EINVAL; 515 } 516 if (cmd == PPPIOCGNPMODE) { 517 npi->mode = sc->sc_npmode[npx]; 518 } else { 519 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 520 return (error); 521 if (npi->mode != sc->sc_npmode[npx]) { 522 s = splimp(); 523 sc->sc_npmode[npx] = npi->mode; 524 if (npi->mode != NPMODE_QUEUE) { 525 ppp_requeue(sc); 526 ppp_restart(sc); 527 } 528 splx(s); 529 } 530 } 531 break; 532 533 case PPPIOCGIDLE: 534 s = splsoftnet(); 535 t = time.tv_sec; 536 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 537 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 538 splx(s); 539 break; 540 541 #ifdef PPP_FILTER 542 case PPPIOCSPASS: 543 case PPPIOCSACTIVE: 544 /* These are no longer supported. */ 545 return EOPNOTSUPP; 546 547 case PPPIOCSIPASS: 548 case PPPIOCSOPASS: 549 case PPPIOCSIACTIVE: 550 case PPPIOCSOACTIVE: 551 nbp = (struct bpf_program *) data; 552 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 553 return EINVAL; 554 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 555 if (newcodelen != 0) { 556 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 557 /* WAITOK -- malloc() never fails. */ 558 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 559 newcodelen)) != 0) { 560 free(newcode, M_DEVBUF); 561 return error; 562 } 563 if (!bpf_validate(newcode, nbp->bf_len)) { 564 free(newcode, M_DEVBUF); 565 return EINVAL; 566 } 567 } else 568 newcode = 0; 569 switch (cmd) { 570 case PPPIOCSIPASS: 571 bp = &sc->sc_pass_filt_in; 572 break; 573 574 case PPPIOCSOPASS: 575 bp = &sc->sc_pass_filt_out; 576 break; 577 578 case PPPIOCSIACTIVE: 579 bp = &sc->sc_active_filt_in; 580 break; 581 582 case PPPIOCSOACTIVE: 583 bp = &sc->sc_active_filt_out; 584 break; 585 } 586 oldcode = bp->bf_insns; 587 s = splimp(); 588 bp->bf_len = nbp->bf_len; 589 bp->bf_insns = newcode; 590 splx(s); 591 if (oldcode != 0) 592 free(oldcode, M_DEVBUF); 593 break; 594 #endif /* PPP_FILTER */ 595 596 default: 597 return (-1); 598 } 599 return (0); 600 } 601 602 /* 603 * Process an ioctl request to the ppp network interface. 604 */ 605 static int 606 pppsioctl(ifp, cmd, data) 607 struct ifnet *ifp; 608 u_long cmd; 609 caddr_t data; 610 { 611 struct proc *p = curproc; /* XXX */ 612 struct ppp_softc *sc = ifp->if_softc; 613 struct ifaddr *ifa = (struct ifaddr *)data; 614 struct ifreq *ifr = (struct ifreq *)data; 615 struct ppp_stats *psp; 616 #ifdef PPP_COMPRESS 617 struct ppp_comp_stats *pcp; 618 #endif 619 int s = splimp(), error = 0; 620 621 switch (cmd) { 622 case SIOCSIFFLAGS: 623 if ((ifp->if_flags & IFF_RUNNING) == 0) 624 ifp->if_flags &= ~IFF_UP; 625 break; 626 627 case SIOCSIFADDR: 628 switch (ifa->ifa_addr->sa_family) { 629 #ifdef INET 630 case AF_INET: 631 break; 632 #endif 633 #ifdef INET6 634 case AF_INET6: 635 break; 636 #endif 637 default: 638 error = EAFNOSUPPORT; 639 break; 640 } 641 break; 642 643 case SIOCSIFDSTADDR: 644 switch (ifa->ifa_addr->sa_family) { 645 #ifdef INET 646 case AF_INET: 647 break; 648 #endif 649 #ifdef INET6 650 case AF_INET6: 651 break; 652 #endif 653 default: 654 error = EAFNOSUPPORT; 655 break; 656 } 657 break; 658 659 case SIOCSIFMTU: 660 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 661 break; 662 sc->sc_if.if_mtu = ifr->ifr_mtu; 663 break; 664 665 case SIOCGIFMTU: 666 ifr->ifr_mtu = sc->sc_if.if_mtu; 667 break; 668 669 case SIOCADDMULTI: 670 case SIOCDELMULTI: 671 if (ifr == 0) { 672 error = EAFNOSUPPORT; 673 break; 674 } 675 switch(ifr->ifr_addr.sa_family) { 676 #ifdef INET 677 case AF_INET: 678 break; 679 #endif 680 #ifdef INET6 681 case AF_INET6: 682 break; 683 #endif 684 default: 685 error = EAFNOSUPPORT; 686 break; 687 } 688 break; 689 690 case SIOCGPPPSTATS: 691 psp = &((struct ifpppstatsreq *) data)->stats; 692 bzero(psp, sizeof(*psp)); 693 psp->p = sc->sc_stats; 694 #if defined(VJC) && !defined(SL_NO_STATS) 695 if (sc->sc_comp) { 696 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 697 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 698 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 699 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 700 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 701 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 702 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 703 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 704 } 705 #endif /* VJC */ 706 break; 707 708 #ifdef PPP_COMPRESS 709 case SIOCGPPPCSTATS: 710 pcp = &((struct ifpppcstatsreq *) data)->stats; 711 bzero(pcp, sizeof(*pcp)); 712 if (sc->sc_xc_state != NULL) 713 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 714 if (sc->sc_rc_state != NULL) 715 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 716 break; 717 #endif /* PPP_COMPRESS */ 718 719 default: 720 error = EINVAL; 721 } 722 splx(s); 723 return (error); 724 } 725 726 /* 727 * Queue a packet. Start transmission if not active. 728 * Packet is placed in Information field of PPP frame. 729 */ 730 int 731 pppoutput(ifp, m0, dst, rtp) 732 struct ifnet *ifp; 733 struct mbuf *m0; 734 struct sockaddr *dst; 735 struct rtentry *rtp; 736 { 737 struct ppp_softc *sc = ifp->if_softc; 738 int protocol, address, control; 739 u_char *cp; 740 int s, error; 741 #ifdef INET 742 struct ip *ip; 743 #endif 744 struct ifqueue *ifq; 745 enum NPmode mode; 746 int len; 747 struct mbuf *m; 748 ALTQ_DECL(struct altq_pktattr pktattr;) 749 750 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 751 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 752 error = ENETDOWN; /* sort of */ 753 goto bad; 754 } 755 756 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 757 758 /* 759 * Compute PPP header. 760 */ 761 m0->m_flags &= ~M_HIGHPRI; 762 switch (dst->sa_family) { 763 #ifdef INET 764 case AF_INET: 765 address = PPP_ALLSTATIONS; 766 control = PPP_UI; 767 protocol = PPP_IP; 768 mode = sc->sc_npmode[NP_IP]; 769 770 /* 771 * If this packet has the "low delay" bit set in the IP header, 772 * put it on the fastq instead. 773 */ 774 ip = mtod(m0, struct ip *); 775 if (ip->ip_tos & IPTOS_LOWDELAY) 776 m0->m_flags |= M_HIGHPRI; 777 break; 778 #endif 779 #ifdef INET6 780 case AF_INET6: 781 address = PPP_ALLSTATIONS; /*XXX*/ 782 control = PPP_UI; /*XXX*/ 783 protocol = PPP_IPV6; 784 mode = sc->sc_npmode[NP_IPV6]; 785 786 #if 0 /* XXX flowinfo/traffic class, maybe? */ 787 /* 788 * If this packet has the "low delay" bit set in the IP header, 789 * put it on the fastq instead. 790 */ 791 ip = mtod(m0, struct ip *); 792 if (ip->ip_tos & IPTOS_LOWDELAY) 793 m0->m_flags |= M_HIGHPRI; 794 #endif 795 break; 796 #endif 797 case AF_UNSPEC: 798 address = PPP_ADDRESS(dst->sa_data); 799 control = PPP_CONTROL(dst->sa_data); 800 protocol = PPP_PROTOCOL(dst->sa_data); 801 mode = NPMODE_PASS; 802 break; 803 default: 804 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 805 error = EAFNOSUPPORT; 806 goto bad; 807 } 808 809 /* 810 * Drop this packet, or return an error, if necessary. 811 */ 812 if (mode == NPMODE_ERROR) { 813 error = ENETDOWN; 814 goto bad; 815 } 816 if (mode == NPMODE_DROP) { 817 error = 0; 818 goto bad; 819 } 820 821 /* 822 * Add PPP header. If no space in first mbuf, allocate another. 823 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 824 */ 825 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 826 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 827 if (m0 == 0) { 828 error = ENOBUFS; 829 goto bad; 830 } 831 m0->m_len = 0; 832 } else 833 m0->m_data -= PPP_HDRLEN; 834 835 cp = mtod(m0, u_char *); 836 *cp++ = address; 837 *cp++ = control; 838 *cp++ = protocol >> 8; 839 *cp++ = protocol & 0xff; 840 m0->m_len += PPP_HDRLEN; 841 842 len = 0; 843 for (m = m0; m != 0; m = m->m_next) 844 len += m->m_len; 845 846 if (sc->sc_flags & SC_LOG_OUTPKT) { 847 printf("%s output: ", ifp->if_xname); 848 pppdumpm(m0); 849 } 850 851 if ((protocol & 0x8000) == 0) { 852 #ifdef PPP_FILTER 853 /* 854 * Apply the pass and active filters to the packet, 855 * but only if it is a data packet. 856 */ 857 if (sc->sc_pass_filt_out.bf_insns != 0 858 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 859 len, 0) == 0) { 860 error = 0; /* drop this packet */ 861 goto bad; 862 } 863 864 /* 865 * Update the time we sent the most recent packet. 866 */ 867 if (sc->sc_active_filt_out.bf_insns == 0 868 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 869 len, 0)) 870 sc->sc_last_sent = time.tv_sec; 871 #else 872 /* 873 * Update the time we sent the most recent packet. 874 */ 875 sc->sc_last_sent = time.tv_sec; 876 #endif /* PPP_FILTER */ 877 } 878 879 #if NBPFILTER > 0 880 /* 881 * See if bpf wants to look at the packet. 882 */ 883 if (sc->sc_if.if_bpf) 884 bpf_mtap(sc->sc_if.if_bpf, m0); 885 #endif 886 887 /* 888 * Put the packet on the appropriate queue. 889 */ 890 s = splimp(); 891 if (mode == NPMODE_QUEUE) { 892 /* XXX we should limit the number of packets on this queue */ 893 *sc->sc_npqtail = m0; 894 m0->m_nextpkt = NULL; 895 sc->sc_npqtail = &m0->m_nextpkt; 896 } else { 897 if ((m0->m_flags & M_HIGHPRI) 898 #ifdef ALTQ 899 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 900 #endif 901 ) { 902 ifq = &sc->sc_fastq; 903 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 904 IF_DROP(ifq); 905 splx(s); 906 error = ENOBUFS; 907 goto bad; 908 } else { 909 IF_ENQUEUE(ifq, m0); 910 error = 0; 911 } 912 } else 913 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 914 if (error) { 915 splx(s); 916 sc->sc_if.if_oerrors++; 917 sc->sc_stats.ppp_oerrors++; 918 return (error); 919 } 920 ppp_restart(sc); 921 } 922 ifp->if_lastchange = time; 923 ifp->if_opackets++; 924 ifp->if_obytes += len; 925 926 splx(s); 927 return (0); 928 929 bad: 930 m_freem(m0); 931 return (error); 932 } 933 934 /* 935 * After a change in the NPmode for some NP, move packets from the 936 * npqueue to the send queue or the fast queue as appropriate. 937 * Should be called at splimp, since we muck with the queues. 938 */ 939 static void 940 ppp_requeue(sc) 941 struct ppp_softc *sc; 942 { 943 struct mbuf *m, **mpp; 944 struct ifqueue *ifq; 945 enum NPmode mode; 946 int error; 947 948 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 949 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 950 case PPP_IP: 951 mode = sc->sc_npmode[NP_IP]; 952 break; 953 case PPP_IPV6: 954 mode = sc->sc_npmode[NP_IPV6]; 955 break; 956 default: 957 mode = NPMODE_PASS; 958 } 959 960 switch (mode) { 961 case NPMODE_PASS: 962 /* 963 * This packet can now go on one of the queues to be sent. 964 */ 965 *mpp = m->m_nextpkt; 966 m->m_nextpkt = NULL; 967 if ((m->m_flags & M_HIGHPRI) 968 #ifdef ALTQ 969 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 970 #endif 971 ) { 972 ifq = &sc->sc_fastq; 973 if (IF_QFULL(ifq)) { 974 IF_DROP(ifq); 975 m_freem(m); 976 error = ENOBUFS; 977 } else { 978 IF_ENQUEUE(ifq, m); 979 error = 0; 980 } 981 } else 982 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 983 if (error) { 984 sc->sc_if.if_oerrors++; 985 sc->sc_stats.ppp_oerrors++; 986 } 987 break; 988 989 case NPMODE_DROP: 990 case NPMODE_ERROR: 991 *mpp = m->m_nextpkt; 992 m_freem(m); 993 break; 994 995 case NPMODE_QUEUE: 996 mpp = &m->m_nextpkt; 997 break; 998 } 999 } 1000 sc->sc_npqtail = mpp; 1001 } 1002 1003 /* 1004 * Transmitter has finished outputting some stuff; 1005 * remember to call sc->sc_start later at splsoftnet. 1006 */ 1007 void 1008 ppp_restart(sc) 1009 struct ppp_softc *sc; 1010 { 1011 int s = splimp(); 1012 1013 sc->sc_flags &= ~SC_TBUSY; 1014 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1015 softintr_schedule(sc->sc_si); 1016 #else 1017 schednetisr(NETISR_PPP); 1018 #endif 1019 splx(s); 1020 } 1021 1022 /* 1023 * Get a packet to send. This procedure is intended to be called at 1024 * splsoftnet, since it may involve time-consuming operations such as 1025 * applying VJ compression, packet compression, address/control and/or 1026 * protocol field compression to the packet. 1027 */ 1028 struct mbuf * 1029 ppp_dequeue(sc) 1030 struct ppp_softc *sc; 1031 { 1032 struct mbuf *m, *mp; 1033 u_char *cp; 1034 int address, control, protocol; 1035 int s; 1036 1037 /* 1038 * Grab a packet to send: first try the fast queue, then the 1039 * normal queue. 1040 */ 1041 s = splimp(); 1042 IF_DEQUEUE(&sc->sc_fastq, m); 1043 if (m == NULL) 1044 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1045 splx(s); 1046 1047 if (m == NULL) 1048 return NULL; 1049 1050 ++sc->sc_stats.ppp_opackets; 1051 1052 /* 1053 * Extract the ppp header of the new packet. 1054 * The ppp header will be in one mbuf. 1055 */ 1056 cp = mtod(m, u_char *); 1057 address = PPP_ADDRESS(cp); 1058 control = PPP_CONTROL(cp); 1059 protocol = PPP_PROTOCOL(cp); 1060 1061 switch (protocol) { 1062 case PPP_IP: 1063 #ifdef VJC 1064 /* 1065 * If the packet is a TCP/IP packet, see if we can compress it. 1066 */ 1067 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1068 struct ip *ip; 1069 int type; 1070 1071 mp = m; 1072 ip = (struct ip *) (cp + PPP_HDRLEN); 1073 if (mp->m_len <= PPP_HDRLEN) { 1074 mp = mp->m_next; 1075 if (mp == NULL) 1076 break; 1077 ip = mtod(mp, struct ip *); 1078 } 1079 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1080 if (ip->ip_p == IPPROTO_TCP) { 1081 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1082 !(sc->sc_flags & SC_NO_TCP_CCID)); 1083 switch (type) { 1084 case TYPE_UNCOMPRESSED_TCP: 1085 protocol = PPP_VJC_UNCOMP; 1086 break; 1087 case TYPE_COMPRESSED_TCP: 1088 protocol = PPP_VJC_COMP; 1089 cp = mtod(m, u_char *); 1090 cp[0] = address; /* header has moved */ 1091 cp[1] = control; 1092 cp[2] = 0; 1093 break; 1094 } 1095 cp[3] = protocol; /* update protocol in PPP header */ 1096 } 1097 } 1098 #endif /* VJC */ 1099 break; 1100 1101 #ifdef PPP_COMPRESS 1102 case PPP_CCP: 1103 ppp_ccp(sc, m, 0); 1104 break; 1105 #endif /* PPP_COMPRESS */ 1106 } 1107 1108 #ifdef PPP_COMPRESS 1109 if (protocol != PPP_LCP && protocol != PPP_CCP 1110 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1111 struct mbuf *mcomp = NULL; 1112 int slen, clen; 1113 1114 slen = 0; 1115 for (mp = m; mp != NULL; mp = mp->m_next) 1116 slen += mp->m_len; 1117 clen = (*sc->sc_xcomp->compress) 1118 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1119 if (mcomp != NULL) { 1120 if (sc->sc_flags & SC_CCP_UP) { 1121 /* Send the compressed packet instead of the original. */ 1122 m_freem(m); 1123 m = mcomp; 1124 cp = mtod(m, u_char *); 1125 protocol = cp[3]; 1126 } else { 1127 /* Can't transmit compressed packets until CCP is up. */ 1128 m_freem(mcomp); 1129 } 1130 } 1131 } 1132 #endif /* PPP_COMPRESS */ 1133 1134 /* 1135 * Compress the address/control and protocol, if possible. 1136 */ 1137 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1138 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1139 protocol != PPP_LCP) { 1140 /* can compress address/control */ 1141 m->m_data += 2; 1142 m->m_len -= 2; 1143 } 1144 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1145 /* can compress protocol */ 1146 if (mtod(m, u_char *) == cp) { 1147 cp[2] = cp[1]; /* move address/control up */ 1148 cp[1] = cp[0]; 1149 } 1150 ++m->m_data; 1151 --m->m_len; 1152 } 1153 1154 return m; 1155 } 1156 1157 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1158 void 1159 pppnetisr(void) 1160 { 1161 struct ppp_softc *sc; 1162 int i; 1163 1164 for (i = 0; i < NPPP; i++) { 1165 sc = &ppp_softc[i]; 1166 pppintr(sc); 1167 } 1168 } 1169 #endif 1170 1171 /* 1172 * Software interrupt routine, called at splsoftnet. 1173 */ 1174 void 1175 pppintr(void *arg) 1176 { 1177 struct ppp_softc *sc = arg; 1178 struct mbuf *m; 1179 int s; 1180 1181 if (!(sc->sc_flags & SC_TBUSY) 1182 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1183 || sc->sc_outm)) { 1184 s = splimp(); 1185 sc->sc_flags |= SC_TBUSY; 1186 splx(s); 1187 (*sc->sc_start)(sc); 1188 } 1189 for (;;) { 1190 s = splimp(); 1191 IF_DEQUEUE(&sc->sc_rawq, m); 1192 splx(s); 1193 if (m == NULL) 1194 break; 1195 ppp_inproc(sc, m); 1196 } 1197 } 1198 1199 #ifdef PPP_COMPRESS 1200 /* 1201 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1202 * 0 if it is about to be transmitted. 1203 */ 1204 static void 1205 ppp_ccp(sc, m, rcvd) 1206 struct ppp_softc *sc; 1207 struct mbuf *m; 1208 int rcvd; 1209 { 1210 u_char *dp, *ep; 1211 struct mbuf *mp; 1212 int slen, s; 1213 1214 /* 1215 * Get a pointer to the data after the PPP header. 1216 */ 1217 if (m->m_len <= PPP_HDRLEN) { 1218 mp = m->m_next; 1219 if (mp == NULL) 1220 return; 1221 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1222 } else { 1223 mp = m; 1224 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1225 } 1226 1227 ep = mtod(mp, u_char *) + mp->m_len; 1228 if (dp + CCP_HDRLEN > ep) 1229 return; 1230 slen = CCP_LENGTH(dp); 1231 if (dp + slen > ep) { 1232 if (sc->sc_flags & SC_DEBUG) 1233 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1234 dp, slen, mtod(mp, u_char *), mp->m_len); 1235 return; 1236 } 1237 1238 switch (CCP_CODE(dp)) { 1239 case CCP_CONFREQ: 1240 case CCP_TERMREQ: 1241 case CCP_TERMACK: 1242 /* CCP must be going down - disable compression */ 1243 if (sc->sc_flags & SC_CCP_UP) { 1244 s = splimp(); 1245 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1246 splx(s); 1247 } 1248 break; 1249 1250 case CCP_CONFACK: 1251 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1252 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1253 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1254 if (!rcvd) { 1255 /* we're agreeing to send compressed packets. */ 1256 if (sc->sc_xc_state != NULL 1257 && (*sc->sc_xcomp->comp_init) 1258 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1259 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1260 s = splimp(); 1261 sc->sc_flags |= SC_COMP_RUN; 1262 splx(s); 1263 } 1264 } else { 1265 /* peer is agreeing to send compressed packets. */ 1266 if (sc->sc_rc_state != NULL 1267 && (*sc->sc_rcomp->decomp_init) 1268 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1269 sc->sc_unit, 0, sc->sc_mru, 1270 sc->sc_flags & SC_DEBUG)) { 1271 s = splimp(); 1272 sc->sc_flags |= SC_DECOMP_RUN; 1273 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1274 splx(s); 1275 } 1276 } 1277 } 1278 break; 1279 1280 case CCP_RESETACK: 1281 if (sc->sc_flags & SC_CCP_UP) { 1282 if (!rcvd) { 1283 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1284 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1285 } else { 1286 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1287 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1288 s = splimp(); 1289 sc->sc_flags &= ~SC_DC_ERROR; 1290 splx(s); 1291 } 1292 } 1293 } 1294 break; 1295 } 1296 } 1297 1298 /* 1299 * CCP is down; free (de)compressor state if necessary. 1300 */ 1301 static void 1302 ppp_ccp_closed(sc) 1303 struct ppp_softc *sc; 1304 { 1305 if (sc->sc_xc_state) { 1306 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1307 sc->sc_xc_state = NULL; 1308 } 1309 if (sc->sc_rc_state) { 1310 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1311 sc->sc_rc_state = NULL; 1312 } 1313 } 1314 #endif /* PPP_COMPRESS */ 1315 1316 /* 1317 * PPP packet input routine. 1318 * The caller has checked and removed the FCS and has inserted 1319 * the address/control bytes and the protocol high byte if they 1320 * were omitted. 1321 */ 1322 void 1323 ppppktin(sc, m, lost) 1324 struct ppp_softc *sc; 1325 struct mbuf *m; 1326 int lost; 1327 { 1328 int s = splimp(); 1329 1330 if (lost) 1331 m->m_flags |= M_ERRMARK; 1332 IF_ENQUEUE(&sc->sc_rawq, m); 1333 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1334 softintr_schedule(sc->sc_si); 1335 #else 1336 schednetisr(NETISR_PPP); 1337 #endif 1338 splx(s); 1339 } 1340 1341 /* 1342 * Process a received PPP packet, doing decompression as necessary. 1343 * Should be called at splsoftnet. 1344 */ 1345 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1346 TYPE_UNCOMPRESSED_TCP) 1347 1348 static void 1349 ppp_inproc(sc, m) 1350 struct ppp_softc *sc; 1351 struct mbuf *m; 1352 { 1353 struct ifnet *ifp = &sc->sc_if; 1354 struct ifqueue *inq; 1355 int s, ilen, proto, rv; 1356 u_char *cp, adrs, ctrl; 1357 struct mbuf *mp, *dmp = NULL; 1358 #ifdef VJC 1359 int xlen; 1360 u_char *iphdr; 1361 u_int hlen; 1362 #endif 1363 1364 sc->sc_stats.ppp_ipackets++; 1365 1366 if (sc->sc_flags & SC_LOG_INPKT) { 1367 ilen = 0; 1368 for (mp = m; mp != NULL; mp = mp->m_next) 1369 ilen += mp->m_len; 1370 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1371 pppdumpm(m); 1372 } 1373 1374 cp = mtod(m, u_char *); 1375 adrs = PPP_ADDRESS(cp); 1376 ctrl = PPP_CONTROL(cp); 1377 proto = PPP_PROTOCOL(cp); 1378 1379 if (m->m_flags & M_ERRMARK) { 1380 m->m_flags &= ~M_ERRMARK; 1381 s = splimp(); 1382 sc->sc_flags |= SC_VJ_RESET; 1383 splx(s); 1384 } 1385 1386 #ifdef PPP_COMPRESS 1387 /* 1388 * Decompress this packet if necessary, update the receiver's 1389 * dictionary, or take appropriate action on a CCP packet. 1390 */ 1391 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1392 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1393 /* decompress this packet */ 1394 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1395 if (rv == DECOMP_OK) { 1396 m_freem(m); 1397 if (dmp == NULL) { 1398 /* no error, but no decompressed packet produced */ 1399 return; 1400 } 1401 m = dmp; 1402 cp = mtod(m, u_char *); 1403 proto = PPP_PROTOCOL(cp); 1404 1405 } else { 1406 /* 1407 * An error has occurred in decompression. 1408 * Pass the compressed packet up to pppd, which may take 1409 * CCP down or issue a Reset-Req. 1410 */ 1411 if (sc->sc_flags & SC_DEBUG) 1412 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1413 s = splimp(); 1414 sc->sc_flags |= SC_VJ_RESET; 1415 if (rv == DECOMP_ERROR) 1416 sc->sc_flags |= SC_DC_ERROR; 1417 else 1418 sc->sc_flags |= SC_DC_FERROR; 1419 splx(s); 1420 } 1421 1422 } else { 1423 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1424 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1425 } 1426 if (proto == PPP_CCP) { 1427 ppp_ccp(sc, m, 1); 1428 } 1429 } 1430 #endif 1431 1432 ilen = 0; 1433 for (mp = m; mp != NULL; mp = mp->m_next) 1434 ilen += mp->m_len; 1435 1436 #ifdef VJC 1437 if (sc->sc_flags & SC_VJ_RESET) { 1438 /* 1439 * If we've missed a packet, we must toss subsequent compressed 1440 * packets which don't have an explicit connection ID. 1441 */ 1442 if (sc->sc_comp) 1443 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1444 s = splimp(); 1445 sc->sc_flags &= ~SC_VJ_RESET; 1446 splx(s); 1447 } 1448 1449 /* 1450 * See if we have a VJ-compressed packet to uncompress. 1451 */ 1452 if (proto == PPP_VJC_COMP) { 1453 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1454 goto bad; 1455 1456 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1457 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1458 sc->sc_comp, &iphdr, &hlen); 1459 1460 if (xlen <= 0) { 1461 if (sc->sc_flags & SC_DEBUG) 1462 printf("%s: VJ uncompress failed on type comp\n", 1463 ifp->if_xname); 1464 goto bad; 1465 } 1466 1467 /* Copy the PPP and IP headers into a new mbuf. */ 1468 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1469 if (mp == NULL) 1470 goto bad; 1471 mp->m_len = 0; 1472 mp->m_next = NULL; 1473 if (hlen + PPP_HDRLEN > MHLEN) { 1474 MCLGET(mp, M_DONTWAIT); 1475 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1476 m_freem(mp); 1477 goto bad; /* lose if big headers and no clusters */ 1478 } 1479 } 1480 cp = mtod(mp, u_char *); 1481 cp[0] = adrs; 1482 cp[1] = ctrl; 1483 cp[2] = 0; 1484 cp[3] = PPP_IP; 1485 proto = PPP_IP; 1486 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1487 mp->m_len = hlen + PPP_HDRLEN; 1488 1489 /* 1490 * Trim the PPP and VJ headers off the old mbuf 1491 * and stick the new and old mbufs together. 1492 */ 1493 m->m_data += PPP_HDRLEN + xlen; 1494 m->m_len -= PPP_HDRLEN + xlen; 1495 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1496 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1497 mp->m_len += m->m_len; 1498 MFREE(m, mp->m_next); 1499 } else 1500 mp->m_next = m; 1501 m = mp; 1502 ilen += hlen - xlen; 1503 1504 } else if (proto == PPP_VJC_UNCOMP) { 1505 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1506 goto bad; 1507 1508 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1509 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1510 sc->sc_comp, &iphdr, &hlen); 1511 1512 if (xlen < 0) { 1513 if (sc->sc_flags & SC_DEBUG) 1514 printf("%s: VJ uncompress failed on type uncomp\n", 1515 ifp->if_xname); 1516 goto bad; 1517 } 1518 1519 proto = PPP_IP; 1520 cp[3] = PPP_IP; 1521 } 1522 #endif /* VJC */ 1523 1524 /* 1525 * If the packet will fit in a header mbuf, don't waste a 1526 * whole cluster on it. 1527 */ 1528 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1529 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1530 if (mp != NULL) { 1531 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1532 m_freem(m); 1533 m = mp; 1534 m->m_len = ilen; 1535 } 1536 } 1537 m->m_pkthdr.len = ilen; 1538 m->m_pkthdr.rcvif = ifp; 1539 1540 if ((proto & 0x8000) == 0) { 1541 #ifdef PPP_FILTER 1542 /* 1543 * See whether we want to pass this packet, and 1544 * if it counts as link activity. 1545 */ 1546 if (sc->sc_pass_filt_in.bf_insns != 0 1547 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1548 ilen, 0) == 0) { 1549 /* drop this packet */ 1550 m_freem(m); 1551 return; 1552 } 1553 if (sc->sc_active_filt_in.bf_insns == 0 1554 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1555 ilen, 0)) 1556 sc->sc_last_recv = time.tv_sec; 1557 #else 1558 /* 1559 * Record the time that we received this packet. 1560 */ 1561 sc->sc_last_recv = time.tv_sec; 1562 #endif /* PPP_FILTER */ 1563 } 1564 1565 #if NBPFILTER > 0 1566 /* See if bpf wants to look at the packet. */ 1567 if (sc->sc_if.if_bpf) 1568 bpf_mtap(sc->sc_if.if_bpf, m); 1569 #endif 1570 1571 rv = 0; 1572 switch (proto) { 1573 #ifdef INET 1574 case PPP_IP: 1575 /* 1576 * IP packet - take off the ppp header and pass it up to IP. 1577 */ 1578 if ((ifp->if_flags & IFF_UP) == 0 1579 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1580 /* interface is down - drop the packet. */ 1581 m_freem(m); 1582 return; 1583 } 1584 m->m_pkthdr.len -= PPP_HDRLEN; 1585 m->m_data += PPP_HDRLEN; 1586 m->m_len -= PPP_HDRLEN; 1587 #ifdef GATEWAY 1588 if (ipflow_fastforward(m)) 1589 return; 1590 #endif 1591 schednetisr(NETISR_IP); 1592 inq = &ipintrq; 1593 break; 1594 #endif 1595 1596 #ifdef INET6 1597 case PPP_IPV6: 1598 /* 1599 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1600 */ 1601 if ((ifp->if_flags & IFF_UP) == 0 1602 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1603 /* interface is down - drop the packet. */ 1604 m_freem(m); 1605 return; 1606 } 1607 m->m_pkthdr.len -= PPP_HDRLEN; 1608 m->m_data += PPP_HDRLEN; 1609 m->m_len -= PPP_HDRLEN; 1610 schednetisr(NETISR_IPV6); 1611 inq = &ip6intrq; 1612 break; 1613 #endif 1614 1615 default: 1616 /* 1617 * Some other protocol - place on input queue for read(). 1618 */ 1619 inq = &sc->sc_inq; 1620 rv = 1; 1621 break; 1622 } 1623 1624 /* 1625 * Put the packet on the appropriate input queue. 1626 */ 1627 s = splimp(); 1628 if (IF_QFULL(inq)) { 1629 IF_DROP(inq); 1630 splx(s); 1631 if (sc->sc_flags & SC_DEBUG) 1632 printf("%s: input queue full\n", ifp->if_xname); 1633 ifp->if_iqdrops++; 1634 goto bad; 1635 } 1636 IF_ENQUEUE(inq, m); 1637 splx(s); 1638 ifp->if_ipackets++; 1639 ifp->if_ibytes += ilen; 1640 ifp->if_lastchange = time; 1641 1642 if (rv) 1643 (*sc->sc_ctlp)(sc); 1644 1645 return; 1646 1647 bad: 1648 m_freem(m); 1649 sc->sc_if.if_ierrors++; 1650 sc->sc_stats.ppp_ierrors++; 1651 } 1652 1653 #define MAX_DUMP_BYTES 128 1654 1655 static void 1656 pppdumpm(m0) 1657 struct mbuf *m0; 1658 { 1659 char buf[3*MAX_DUMP_BYTES+4]; 1660 char *bp = buf; 1661 struct mbuf *m; 1662 static char digits[] = "0123456789abcdef"; 1663 1664 for (m = m0; m; m = m->m_next) { 1665 int l = m->m_len; 1666 u_char *rptr = (u_char *)m->m_data; 1667 1668 while (l--) { 1669 if (bp > buf + sizeof(buf) - 4) 1670 goto done; 1671 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1672 *bp++ = digits[*rptr++ & 0xf]; 1673 } 1674 1675 if (m->m_next) { 1676 if (bp > buf + sizeof(buf) - 3) 1677 goto done; 1678 *bp++ = '|'; 1679 } else 1680 *bp++ = ' '; 1681 } 1682 done: 1683 if (m) 1684 *bp++ = '>'; 1685 *bp = 0; 1686 printf("%s\n", buf); 1687 } 1688 1689 #endif /* NPPP > 0 */ 1690
Indexes created Fri Oct 03 02:09:57 GMT 2025