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sys/net/if_ppp.c
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1 /* 2 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. 3 * 4 * Copyright (c) 1989 Carnegie Mellon University. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms are permitted 8 * provided that the above copyright notice and this paragraph are 9 * duplicated in all such forms and that any documentation, 10 * advertising materials, and other materials related to such 11 * distribution and use acknowledge that the software was developed 12 * by Carnegie Mellon University. The name of the 13 * University may not be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 18 * 19 * Drew D. Perkins 20 * Carnegie Mellon University 21 * 4910 Forbes Ave. 22 * Pittsburgh, PA 15213 23 * (412) 268-8576 24 * ddp@andrew.cmu.edu 25 * 26 * Based on: 27 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 28 * 29 * Copyright (c) 1987 Regents of the University of California. 30 * All rights reserved. 31 * 32 * Redistribution and use in source and binary forms are permitted 33 * provided that the above copyright notice and this paragraph are 34 * duplicated in all such forms and that any documentation, 35 * advertising materials, and other materials related to such 36 * distribution and use acknowledge that the software was developed 37 * by the University of California, Berkeley. The name of the 38 * University may not be used to endorse or promote products derived 39 * from this software without specific prior written permission. 40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 41 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 42 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 43 * 44 * Serial Line interface 45 * 46 * Rick Adams 47 * Center for Seismic Studies 48 * 1300 N 17th Street, Suite 1450 49 * Arlington, Virginia 22209 50 * (703)276-7900 51 * rick@seismo.ARPA 52 * seismo!rick 53 * 54 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). 55 * Converted to 4.3BSD Beta by Chris Torek. 56 * Other changes made at Berkeley, based in part on code by Kirk Smith. 57 * 58 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) 59 * Added VJ tcp header compression; more unified ioctls 60 * 61 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). 62 * Cleaned up a lot of the mbuf-related code to fix bugs that 63 * caused system crashes and packet corruption. Changed pppstart 64 * so that it doesn't just give up with a collision if the whole 65 * packet doesn't fit in the output ring buffer. 66 * 67 * Added priority queueing for interactive IP packets, following 68 * the model of if_sl.c, plus hooks for bpf. 69 * Paul Mackerras (paulus@cs.anu.edu.au). 70 */ 71 72 /* $FreeBSD: releng/5.2/sys/net/if_ppp.c 122702 2003-11-14 21:02:22Z andre $ */ 73 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 74 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 75 76 #include "opt_inet.h" 77 #include "opt_ipx.h" 78 #include "opt_mac.h" 79 #include "opt_ppp.h" 80 81 #ifdef INET 82 #define VJC 83 #endif 84 #define PPP_COMPRESS 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/proc.h> 89 #include <sys/mac.h> 90 #include <sys/mbuf.h> 91 #include <sys/socket.h> 92 #include <sys/filio.h> 93 #include <sys/sockio.h> 94 #include <sys/kernel.h> 95 #include <sys/time.h> 96 #include <sys/malloc.h> 97 #include <sys/module.h> 98 99 #include <net/if.h> 100 #include <net/if_types.h> 101 #include <net/netisr.h> 102 #include <net/bpf.h> 103 104 #if INET 105 #include <netinet/in.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/in_var.h> 108 #include <netinet/ip.h> 109 #endif 110 111 #if IPX 112 #include <netipx/ipx.h> 113 #include <netipx/ipx_if.h> 114 #endif 115 116 #ifdef VJC 117 #include <net/slcompress.h> 118 #endif 119 120 #include <net/if_ppp.h> 121 #include <net/if_pppvar.h> 122 123 /* minimise diffs */ 124 #ifndef splsoftnet 125 #define splsoftnet splnet 126 #endif 127 128 #ifdef PPP_COMPRESS 129 #define PACKETPTR struct mbuf * 130 #include <net/ppp_comp.h> 131 #endif 132 133 #define PPPNAME "ppp" 134 static MALLOC_DEFINE(M_PPP, PPPNAME, "PPP interface"); 135 static LIST_HEAD(, ppp_softc) ppp_softc_list; 136 137 /* XXX layering violation */ 138 extern void pppasyncattach(void *); 139 extern void pppasyncdetach(void); 140 141 static int pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 142 static void pppintr(void); 143 144 static void ppp_requeue(struct ppp_softc *); 145 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 146 static void ppp_ccp_closed(struct ppp_softc *); 147 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 148 static void pppdumpm(struct mbuf *m0); 149 static int ppp_clone_create(struct if_clone *, int); 150 static void ppp_clone_destroy(struct ifnet *); 151 152 static struct if_clone ppp_cloner = IF_CLONE_INITIALIZER(PPPNAME, 153 ppp_clone_create, ppp_clone_destroy, 0, IF_MAXUNIT); 154 155 /* 156 * Some useful mbuf macros not in mbuf.h. 157 */ 158 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 159 160 #define M_DATASTART(m) \ 161 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 162 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 163 164 #define M_DATASIZE(m) \ 165 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 166 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 167 168 /* 169 * We steal two bits in the mbuf m_flags, to mark high-priority packets 170 * for output, and received packets following lost/corrupted packets. 171 */ 172 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 173 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 174 175 176 #ifdef PPP_COMPRESS 177 /* 178 * List of compressors we know about. 179 * We leave some space so maybe we can modload compressors. 180 */ 181 182 extern struct compressor ppp_bsd_compress; 183 extern struct compressor ppp_deflate, ppp_deflate_draft; 184 185 static struct compressor *ppp_compressors[8] = { 186 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 187 &ppp_bsd_compress, 188 #endif 189 #if DO_DEFLATE && defined(PPP_DEFLATE) 190 &ppp_deflate, 191 &ppp_deflate_draft, 192 #endif 193 NULL 194 }; 195 #endif /* PPP_COMPRESS */ 196 197 static int 198 ppp_clone_create(struct if_clone *ifc, int unit) 199 { 200 struct ppp_softc *sc; 201 202 sc = malloc(sizeof(struct ppp_softc), M_PPP, M_WAITOK | M_ZERO); 203 sc->sc_if.if_softc = sc; 204 if_initname(&sc->sc_if, ifc->ifc_name, unit); 205 sc->sc_if.if_mtu = PPP_MTU; 206 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 207 sc->sc_if.if_type = IFT_PPP; 208 sc->sc_if.if_hdrlen = PPP_HDRLEN; 209 sc->sc_if.if_ioctl = pppsioctl; 210 sc->sc_if.if_output = pppoutput; 211 sc->sc_if.if_snd.ifq_maxlen = 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 mtx_init(&sc->sc_inq.ifq_mtx, "ppp_inq", NULL, MTX_DEF); 216 mtx_init(&sc->sc_fastq.ifq_mtx, "ppp_fastq", NULL, MTX_DEF); 217 mtx_init(&sc->sc_rawq.ifq_mtx, "ppp_rawq", NULL, MTX_DEF); 218 if_attach(&sc->sc_if); 219 bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN); 220 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 221 222 return (0); 223 } 224 225 static void 226 ppp_clone_destroy(struct ifnet *ifp) 227 { 228 struct ppp_softc *sc; 229 230 sc = ifp->if_softc; 231 232 LIST_REMOVE(sc, sc_list); 233 bpfdetach(ifp); 234 if_detach(ifp); 235 mtx_destroy(&sc->sc_rawq.ifq_mtx); 236 mtx_destroy(&sc->sc_fastq.ifq_mtx); 237 mtx_destroy(&sc->sc_inq.ifq_mtx); 238 } 239 240 static int 241 ppp_modevent(module_t mod, int type, void *data) 242 { 243 switch (type) { 244 case MOD_LOAD: 245 if_clone_attach(&ppp_cloner); 246 247 netisr_register(NETISR_PPP, (netisr_t *)pppintr, NULL, 0); 248 /* 249 * XXX layering violation - if_ppp can work over any lower 250 * level transport that cares to attach to it. 251 */ 252 pppasyncattach(NULL); 253 break; 254 case MOD_UNLOAD: 255 /* XXX: layering violation */ 256 pppasyncdetach(); 257 258 netisr_unregister(NETISR_PPP); 259 260 if_clone_detach(&ppp_cloner); 261 262 while (!LIST_EMPTY(&ppp_softc_list)) 263 ppp_clone_destroy( 264 &LIST_FIRST(&ppp_softc_list)->sc_if); 265 break; 266 } 267 return 0; 268 } 269 270 static moduledata_t ppp_mod = { 271 "if_ppp", 272 ppp_modevent, 273 0 274 }; 275 276 DECLARE_MODULE(if_ppp, ppp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 277 278 /* 279 * Allocate a ppp interface unit and initialize it. 280 */ 281 struct ppp_softc * 282 pppalloc(pid) 283 pid_t pid; 284 { 285 int i; 286 char tmpname[IFNAMSIZ]; 287 struct ifnet *ifp; 288 struct ppp_softc *sc; 289 290 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 291 if (sc->sc_xfer == pid) { 292 sc->sc_xfer = 0; 293 return sc; 294 } 295 } 296 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 297 if (sc->sc_devp == NULL) 298 break; 299 } 300 /* Try to clone an interface if we don't have a free one */ 301 if (sc == NULL) { 302 strcpy(tmpname, PPPNAME); 303 if (if_clone_create(tmpname, sizeof(tmpname)) != 0) 304 return NULL; 305 ifp = ifunit(tmpname); 306 if (ifp == NULL) 307 return NULL; 308 sc = ifp->if_softc; 309 } 310 if (sc == NULL || sc->sc_devp != NULL) 311 return NULL; 312 313 sc->sc_flags = 0; 314 sc->sc_mru = PPP_MRU; 315 sc->sc_relinq = NULL; 316 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 317 #ifdef VJC 318 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 319 M_DEVBUF, M_NOWAIT); 320 if (sc->sc_comp) 321 sl_compress_init(sc->sc_comp, -1); 322 #endif 323 #ifdef PPP_COMPRESS 324 sc->sc_xc_state = NULL; 325 sc->sc_rc_state = NULL; 326 #endif /* PPP_COMPRESS */ 327 for (i = 0; i < NUM_NP; ++i) 328 sc->sc_npmode[i] = NPMODE_ERROR; 329 sc->sc_npqueue = NULL; 330 sc->sc_npqtail = &sc->sc_npqueue; 331 sc->sc_last_sent = sc->sc_last_recv = time_second; 332 333 return sc; 334 } 335 336 /* 337 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 338 */ 339 void 340 pppdealloc(sc) 341 struct ppp_softc *sc; 342 { 343 struct mbuf *m; 344 345 if_down(&sc->sc_if); 346 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 347 getmicrotime(&sc->sc_if.if_lastchange); 348 sc->sc_devp = NULL; 349 sc->sc_xfer = 0; 350 IF_DRAIN(&sc->sc_rawq); 351 IF_DRAIN(&sc->sc_inq); 352 IF_DRAIN(&sc->sc_fastq); 353 while ((m = sc->sc_npqueue) != NULL) { 354 sc->sc_npqueue = m->m_nextpkt; 355 m_freem(m); 356 } 357 #ifdef PPP_COMPRESS 358 ppp_ccp_closed(sc); 359 sc->sc_xc_state = NULL; 360 sc->sc_rc_state = NULL; 361 #endif /* PPP_COMPRESS */ 362 #ifdef PPP_FILTER 363 if (sc->sc_pass_filt.bf_insns != 0) { 364 free(sc->sc_pass_filt.bf_insns, M_DEVBUF); 365 sc->sc_pass_filt.bf_insns = 0; 366 sc->sc_pass_filt.bf_len = 0; 367 } 368 if (sc->sc_active_filt.bf_insns != 0) { 369 free(sc->sc_active_filt.bf_insns, M_DEVBUF); 370 sc->sc_active_filt.bf_insns = 0; 371 sc->sc_active_filt.bf_len = 0; 372 } 373 #endif /* PPP_FILTER */ 374 #ifdef VJC 375 if (sc->sc_comp != 0) { 376 free(sc->sc_comp, M_DEVBUF); 377 sc->sc_comp = 0; 378 } 379 #endif 380 } 381 382 /* 383 * Ioctl routine for generic ppp devices. 384 */ 385 int 386 pppioctl(sc, cmd, data, flag, td) 387 struct ppp_softc *sc; 388 u_long cmd; 389 caddr_t data; 390 int flag; 391 struct thread *td; 392 { 393 struct proc *p = td->td_proc; 394 int s, flags, mru, npx; 395 u_int nb; 396 int error = 0; 397 struct ppp_option_data *odp; 398 struct compressor **cp; 399 struct npioctl *npi; 400 time_t t; 401 #ifdef PPP_FILTER 402 struct bpf_program *bp, *nbp; 403 struct bpf_insn *newcode, *oldcode; 404 int newcodelen; 405 #endif /* PPP_FILTER */ 406 #ifdef PPP_COMPRESS 407 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 408 #endif 409 410 switch (cmd) { 411 case FIONREAD: 412 *(int *)data = sc->sc_inq.ifq_len; 413 break; 414 415 case PPPIOCGUNIT: 416 *(int *)data = sc->sc_if.if_dunit; 417 break; 418 419 case PPPIOCGFLAGS: 420 *(u_int *)data = sc->sc_flags; 421 break; 422 423 case PPPIOCSFLAGS: 424 if ((error = suser(td)) != 0) 425 break; 426 flags = *(int *)data & SC_MASK; 427 s = splsoftnet(); 428 #ifdef PPP_COMPRESS 429 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 430 ppp_ccp_closed(sc); 431 #endif 432 splimp(); 433 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 434 splx(s); 435 break; 436 437 case PPPIOCSMRU: 438 if ((error = suser(td)) != 0) 439 return (error); 440 mru = *(int *)data; 441 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 442 sc->sc_mru = mru; 443 break; 444 445 case PPPIOCGMRU: 446 *(int *)data = sc->sc_mru; 447 break; 448 449 #ifdef VJC 450 case PPPIOCSMAXCID: 451 if ((error = suser(td)) != 0) 452 break; 453 if (sc->sc_comp) { 454 s = splsoftnet(); 455 sl_compress_init(sc->sc_comp, *(int *)data); 456 splx(s); 457 } 458 break; 459 #endif 460 461 case PPPIOCXFERUNIT: 462 if ((error = suser(td)) != 0) 463 break; 464 sc->sc_xfer = p->p_pid; 465 break; 466 467 #ifdef PPP_COMPRESS 468 case PPPIOCSCOMPRESS: 469 if ((error = suser(td)) != 0) 470 break; 471 odp = (struct ppp_option_data *) data; 472 nb = odp->length; 473 if (nb > sizeof(ccp_option)) 474 nb = sizeof(ccp_option); 475 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 476 break; 477 if (ccp_option[1] < 2) { /* preliminary check on the length byte */ 478 error = EINVAL; 479 break; 480 } 481 for (cp = ppp_compressors; *cp != NULL; ++cp) 482 if ((*cp)->compress_proto == ccp_option[0]) { 483 /* 484 * Found a handler for the protocol - try to allocate 485 * a compressor or decompressor. 486 */ 487 error = 0; 488 if (odp->transmit) { 489 s = splsoftnet(); 490 if (sc->sc_xc_state != NULL) 491 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 492 sc->sc_xcomp = *cp; 493 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 494 if (sc->sc_xc_state == NULL) { 495 if (sc->sc_flags & SC_DEBUG) 496 if_printf(&sc->sc_if, "comp_alloc failed\n"); 497 error = ENOBUFS; 498 } 499 splimp(); 500 sc->sc_flags &= ~SC_COMP_RUN; 501 splx(s); 502 } else { 503 s = splsoftnet(); 504 if (sc->sc_rc_state != NULL) 505 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 506 sc->sc_rcomp = *cp; 507 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 508 if (sc->sc_rc_state == NULL) { 509 if (sc->sc_flags & SC_DEBUG) 510 if_printf(&sc->sc_if, "decomp_alloc failed\n"); 511 error = ENOBUFS; 512 } 513 splimp(); 514 sc->sc_flags &= ~SC_DECOMP_RUN; 515 splx(s); 516 } 517 break; 518 } 519 if (sc->sc_flags & SC_DEBUG) 520 if_printf(&sc->sc_if, "no compressor for [%x %x %x], %x\n", 521 ccp_option[0], ccp_option[1], ccp_option[2], nb); 522 error = EINVAL; /* no handler found */ 523 break; 524 #endif /* PPP_COMPRESS */ 525 526 case PPPIOCGNPMODE: 527 case PPPIOCSNPMODE: 528 npi = (struct npioctl *) data; 529 npx = 0; /* XXX: quiet gcc */ 530 switch (npi->protocol) { 531 case PPP_IP: 532 npx = NP_IP; 533 break; 534 default: 535 error = EINVAL; 536 } 537 if (error) 538 break; 539 if (cmd == PPPIOCGNPMODE) { 540 npi->mode = sc->sc_npmode[npx]; 541 } else { 542 if ((error = suser(td)) != 0) 543 break; 544 if (npi->mode != sc->sc_npmode[npx]) { 545 s = splsoftnet(); 546 sc->sc_npmode[npx] = npi->mode; 547 if (npi->mode != NPMODE_QUEUE) { 548 ppp_requeue(sc); 549 (*sc->sc_start)(sc); 550 } 551 splx(s); 552 } 553 } 554 break; 555 556 case PPPIOCGIDLE: 557 s = splsoftnet(); 558 t = time_second; 559 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 560 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 561 splx(s); 562 break; 563 564 #ifdef PPP_FILTER 565 case PPPIOCSPASS: 566 case PPPIOCSACTIVE: 567 nbp = (struct bpf_program *) data; 568 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) { 569 error = EINVAL; 570 break; 571 } 572 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 573 if (newcodelen != 0) { 574 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 575 if (newcode == 0) { 576 error = EINVAL; /* or sumpin */ 577 break; 578 } 579 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 580 newcodelen)) != 0) { 581 free(newcode, M_DEVBUF); 582 break; 583 } 584 if (!bpf_validate(newcode, nbp->bf_len)) { 585 free(newcode, M_DEVBUF); 586 error = EINVAL; 587 break; 588 } 589 } else 590 newcode = 0; 591 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 592 oldcode = bp->bf_insns; 593 s = splimp(); 594 bp->bf_len = nbp->bf_len; 595 bp->bf_insns = newcode; 596 splx(s); 597 if (oldcode != 0) 598 free(oldcode, M_DEVBUF); 599 break; 600 #endif 601 602 default: 603 error = ENOIOCTL; 604 break; 605 } 606 return (error); 607 } 608 609 /* 610 * Process an ioctl request to the ppp network interface. 611 */ 612 static int 613 pppsioctl(ifp, cmd, data) 614 register struct ifnet *ifp; 615 u_long cmd; 616 caddr_t data; 617 { 618 struct thread *td = curthread; /* XXX */ 619 register struct ppp_softc *sc = ifp->if_softc; 620 register struct ifaddr *ifa = (struct ifaddr *)data; 621 register struct ifreq *ifr = (struct ifreq *)data; 622 struct ppp_stats *psp; 623 #ifdef PPP_COMPRESS 624 struct ppp_comp_stats *pcp; 625 #endif 626 int s = splimp(), error = 0; 627 628 switch (cmd) { 629 case SIOCSIFFLAGS: 630 if ((ifp->if_flags & IFF_RUNNING) == 0) 631 ifp->if_flags &= ~IFF_UP; 632 break; 633 634 case SIOCSIFADDR: 635 case SIOCAIFADDR: 636 switch(ifa->ifa_addr->sa_family) { 637 #ifdef INET 638 case AF_INET: 639 break; 640 #endif 641 #ifdef IPX 642 case AF_IPX: 643 break; 644 #endif 645 default: 646 error = EAFNOSUPPORT; 647 break; 648 } 649 break; 650 651 case SIOCSIFDSTADDR: 652 switch(ifa->ifa_addr->sa_family) { 653 #ifdef INET 654 case AF_INET: 655 break; 656 #endif 657 #ifdef IPX 658 case AF_IPX: 659 break; 660 #endif 661 default: 662 error = EAFNOSUPPORT; 663 break; 664 } 665 break; 666 667 case SIOCSIFMTU: 668 if ((error = suser(td)) != 0) 669 break; 670 if (ifr->ifr_mtu > PPP_MAXMTU) 671 error = EINVAL; 672 else { 673 sc->sc_if.if_mtu = ifr->ifr_mtu; 674 if (sc->sc_setmtu) 675 (*sc->sc_setmtu)(sc); 676 } 677 break; 678 679 case SIOCGIFMTU: 680 ifr->ifr_mtu = sc->sc_if.if_mtu; 681 break; 682 683 case SIOCADDMULTI: 684 case SIOCDELMULTI: 685 if (ifr == 0) { 686 error = EAFNOSUPPORT; 687 break; 688 } 689 switch(ifr->ifr_addr.sa_family) { 690 #ifdef INET 691 case AF_INET: 692 break; 693 #endif 694 default: 695 error = EAFNOSUPPORT; 696 break; 697 } 698 break; 699 700 case SIOCGPPPSTATS: 701 psp = &((struct ifpppstatsreq *) data)->stats; 702 bzero(psp, sizeof(*psp)); 703 psp->p = sc->sc_stats; 704 #if defined(VJC) && !defined(SL_NO_STATS) 705 if (sc->sc_comp) { 706 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 707 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 708 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 709 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 710 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 711 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 712 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 713 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 714 } 715 #endif /* VJC */ 716 break; 717 718 #ifdef PPP_COMPRESS 719 case SIOCGPPPCSTATS: 720 pcp = &((struct ifpppcstatsreq *) data)->stats; 721 bzero(pcp, sizeof(*pcp)); 722 if (sc->sc_xc_state != NULL) 723 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 724 if (sc->sc_rc_state != NULL) 725 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 726 break; 727 #endif /* PPP_COMPRESS */ 728 729 default: 730 error = ENOTTY; 731 } 732 splx(s); 733 return (error); 734 } 735 736 /* 737 * Queue a packet. Start transmission if not active. 738 * Packet is placed in Information field of PPP frame. 739 * Called at splnet as the if->if_output handler. 740 * Called at splnet from pppwrite(). 741 */ 742 int 743 pppoutput(ifp, m0, dst, rtp) 744 struct ifnet *ifp; 745 struct mbuf *m0; 746 struct sockaddr *dst; 747 struct rtentry *rtp; 748 { 749 register struct ppp_softc *sc = ifp->if_softc; 750 int protocol, address, control; 751 u_char *cp; 752 int s, error; 753 struct ip *ip; 754 struct ifqueue *ifq; 755 enum NPmode mode; 756 int len; 757 758 #ifdef MAC 759 error = mac_check_ifnet_transmit(ifp, m0); 760 if (error) 761 goto bad; 762 #endif 763 764 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 765 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 766 error = ENETDOWN; /* sort of */ 767 goto bad; 768 } 769 770 /* 771 * Compute PPP header. 772 */ 773 m0->m_flags &= ~M_HIGHPRI; 774 switch (dst->sa_family) { 775 #ifdef INET 776 case AF_INET: 777 address = PPP_ALLSTATIONS; 778 control = PPP_UI; 779 protocol = PPP_IP; 780 mode = sc->sc_npmode[NP_IP]; 781 782 /* 783 * If this packet has the "low delay" bit set in the IP header, 784 * put it on the fastq instead. 785 */ 786 ip = mtod(m0, struct ip *); 787 if (ip->ip_tos & IPTOS_LOWDELAY) 788 m0->m_flags |= M_HIGHPRI; 789 break; 790 #endif 791 #ifdef IPX 792 case AF_IPX: 793 /* 794 * This is pretty bogus.. We dont have an ipxcp module in pppd 795 * yet to configure the link parameters. Sigh. I guess a 796 * manual ifconfig would do.... -Peter 797 */ 798 address = PPP_ALLSTATIONS; 799 control = PPP_UI; 800 protocol = PPP_IPX; 801 mode = NPMODE_PASS; 802 break; 803 #endif 804 case AF_UNSPEC: 805 address = PPP_ADDRESS(dst->sa_data); 806 control = PPP_CONTROL(dst->sa_data); 807 protocol = PPP_PROTOCOL(dst->sa_data); 808 mode = NPMODE_PASS; 809 break; 810 default: 811 if_printf(ifp, "af%d not supported\n", dst->sa_family); 812 error = EAFNOSUPPORT; 813 goto bad; 814 } 815 816 /* 817 * Drop this packet, or return an error, if necessary. 818 */ 819 if (mode == NPMODE_ERROR) { 820 error = ENETDOWN; 821 goto bad; 822 } 823 if (mode == NPMODE_DROP) { 824 error = 0; 825 goto bad; 826 } 827 828 /* 829 * Add PPP header. If no space in first mbuf, allocate another. 830 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 831 */ 832 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 833 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 834 if (m0 == 0) { 835 error = ENOBUFS; 836 goto bad; 837 } 838 m0->m_len = 0; 839 } else 840 m0->m_data -= PPP_HDRLEN; 841 842 cp = mtod(m0, u_char *); 843 *cp++ = address; 844 *cp++ = control; 845 *cp++ = protocol >> 8; 846 *cp++ = protocol & 0xff; 847 m0->m_len += PPP_HDRLEN; 848 849 len = m_length(m0, NULL); 850 851 if (sc->sc_flags & SC_LOG_OUTPKT) { 852 printf("%s output: ", ifp->if_xname); 853 pppdumpm(m0); 854 } 855 856 if ((protocol & 0x8000) == 0) { 857 #ifdef PPP_FILTER 858 /* 859 * Apply the pass and active filters to the packet, 860 * but only if it is a data packet. 861 */ 862 *mtod(m0, u_char *) = 1; /* indicates outbound */ 863 if (sc->sc_pass_filt.bf_insns != 0 864 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 865 len, 0) == 0) { 866 error = 0; /* drop this packet */ 867 goto bad; 868 } 869 870 /* 871 * Update the time we sent the most recent packet. 872 */ 873 if (sc->sc_active_filt.bf_insns == 0 874 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 875 sc->sc_last_sent = time_second; 876 877 *mtod(m0, u_char *) = address; 878 #else 879 /* 880 * Update the time we sent the most recent data packet. 881 */ 882 sc->sc_last_sent = time_second; 883 #endif /* PPP_FILTER */ 884 } 885 886 /* 887 * See if bpf wants to look at the packet. 888 */ 889 BPF_MTAP(ifp, m0); 890 891 /* 892 * Put the packet on the appropriate queue. 893 */ 894 s = splsoftnet(); /* redundant */ 895 if (mode == NPMODE_QUEUE) { 896 /* XXX we should limit the number of packets on this queue */ 897 *sc->sc_npqtail = m0; 898 m0->m_nextpkt = NULL; 899 sc->sc_npqtail = &m0->m_nextpkt; 900 } else { 901 /* fastq and if_snd are emptied at spl[soft]net now */ 902 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; 903 IF_LOCK(ifq); 904 if (_IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 905 _IF_DROP(ifq); 906 IF_UNLOCK(ifq); 907 sc->sc_if.if_oerrors++; 908 sc->sc_stats.ppp_oerrors++; 909 error = ENOBUFS; 910 goto bad; 911 } 912 _IF_ENQUEUE(ifq, m0); 913 IF_UNLOCK(ifq); 914 (*sc->sc_start)(sc); 915 } 916 getmicrotime(&ifp->if_lastchange); 917 ifp->if_opackets++; 918 ifp->if_obytes += len; 919 920 splx(s); 921 return (0); 922 923 bad: 924 m_freem(m0); 925 return (error); 926 } 927 928 /* 929 * After a change in the NPmode for some NP, move packets from the 930 * npqueue to the send queue or the fast queue as appropriate. 931 * Should be called at spl[soft]net. 932 */ 933 static void 934 ppp_requeue(sc) 935 struct ppp_softc *sc; 936 { 937 struct mbuf *m, **mpp; 938 struct ifqueue *ifq; 939 enum NPmode mode; 940 941 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 942 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 943 case PPP_IP: 944 mode = sc->sc_npmode[NP_IP]; 945 break; 946 default: 947 mode = NPMODE_PASS; 948 } 949 950 switch (mode) { 951 case NPMODE_PASS: 952 /* 953 * This packet can now go on one of the queues to be sent. 954 */ 955 *mpp = m->m_nextpkt; 956 m->m_nextpkt = NULL; 957 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; 958 if (! IF_HANDOFF(ifq, m, NULL)) { 959 sc->sc_if.if_oerrors++; 960 sc->sc_stats.ppp_oerrors++; 961 } 962 break; 963 964 case NPMODE_DROP: 965 case NPMODE_ERROR: 966 *mpp = m->m_nextpkt; 967 m_freem(m); 968 break; 969 970 case NPMODE_QUEUE: 971 mpp = &m->m_nextpkt; 972 break; 973 } 974 } 975 sc->sc_npqtail = mpp; 976 } 977 978 /* 979 * Transmitter has finished outputting some stuff; 980 * remember to call sc->sc_start later at splsoftnet. 981 */ 982 void 983 ppp_restart(sc) 984 struct ppp_softc *sc; 985 { 986 int s = splimp(); 987 988 sc->sc_flags &= ~SC_TBUSY; 989 schednetisr(NETISR_PPP); 990 splx(s); 991 } 992 993 994 /* 995 * Get a packet to send. This procedure is intended to be called at 996 * splsoftnet, since it may involve time-consuming operations such as 997 * applying VJ compression, packet compression, address/control and/or 998 * protocol field compression to the packet. 999 */ 1000 struct mbuf * 1001 ppp_dequeue(sc) 1002 struct ppp_softc *sc; 1003 { 1004 struct mbuf *m, *mp; 1005 u_char *cp; 1006 int address, control, protocol; 1007 1008 /* 1009 * Grab a packet to send: first try the fast queue, then the 1010 * normal queue. 1011 */ 1012 IF_DEQUEUE(&sc->sc_fastq, m); 1013 if (m == NULL) 1014 IF_DEQUEUE(&sc->sc_if.if_snd, m); 1015 if (m == NULL) 1016 return NULL; 1017 1018 ++sc->sc_stats.ppp_opackets; 1019 1020 /* 1021 * Extract the ppp header of the new packet. 1022 * The ppp header will be in one mbuf. 1023 */ 1024 cp = mtod(m, u_char *); 1025 address = PPP_ADDRESS(cp); 1026 control = PPP_CONTROL(cp); 1027 protocol = PPP_PROTOCOL(cp); 1028 1029 switch (protocol) { 1030 case PPP_IP: 1031 #ifdef VJC 1032 /* 1033 * If the packet is a TCP/IP packet, see if we can compress it. 1034 */ 1035 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1036 struct ip *ip; 1037 int type; 1038 1039 mp = m; 1040 ip = (struct ip *) (cp + PPP_HDRLEN); 1041 if (mp->m_len <= PPP_HDRLEN) { 1042 mp = mp->m_next; 1043 if (mp == NULL) 1044 break; 1045 ip = mtod(mp, struct ip *); 1046 } 1047 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1048 if (ip->ip_p == IPPROTO_TCP) { 1049 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1050 !(sc->sc_flags & SC_NO_TCP_CCID)); 1051 switch (type) { 1052 case TYPE_UNCOMPRESSED_TCP: 1053 protocol = PPP_VJC_UNCOMP; 1054 break; 1055 case TYPE_COMPRESSED_TCP: 1056 protocol = PPP_VJC_COMP; 1057 cp = mtod(m, u_char *); 1058 cp[0] = address; /* header has moved */ 1059 cp[1] = control; 1060 cp[2] = 0; 1061 break; 1062 } 1063 cp[3] = protocol; /* update protocol in PPP header */ 1064 } 1065 } 1066 #endif /* VJC */ 1067 break; 1068 1069 #ifdef PPP_COMPRESS 1070 case PPP_CCP: 1071 ppp_ccp(sc, m, 0); 1072 break; 1073 #endif /* PPP_COMPRESS */ 1074 } 1075 1076 #ifdef PPP_COMPRESS 1077 if (protocol != PPP_LCP && protocol != PPP_CCP 1078 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1079 struct mbuf *mcomp = NULL; 1080 int slen, clen; 1081 1082 slen = m_length(m, NULL); 1083 clen = (*sc->sc_xcomp->compress) 1084 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1085 if (mcomp != NULL) { 1086 if (sc->sc_flags & SC_CCP_UP) { 1087 /* Send the compressed packet instead of the original. */ 1088 m_freem(m); 1089 m = mcomp; 1090 cp = mtod(m, u_char *); 1091 protocol = cp[3]; 1092 } else { 1093 /* Can't transmit compressed packets until CCP is up. */ 1094 m_freem(mcomp); 1095 } 1096 } 1097 } 1098 #endif /* PPP_COMPRESS */ 1099 1100 /* 1101 * Compress the address/control and protocol, if possible. 1102 */ 1103 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1104 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1105 protocol != PPP_LCP) { 1106 /* can compress address/control */ 1107 m->m_data += 2; 1108 m->m_len -= 2; 1109 } 1110 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1111 /* can compress protocol */ 1112 if (mtod(m, u_char *) == cp) { 1113 cp[2] = cp[1]; /* move address/control up */ 1114 cp[1] = cp[0]; 1115 } 1116 ++m->m_data; 1117 --m->m_len; 1118 } 1119 1120 return m; 1121 } 1122 1123 /* 1124 * Software interrupt routine, called at spl[soft]net. 1125 */ 1126 static void 1127 pppintr() 1128 { 1129 struct ppp_softc *sc; 1130 int s; 1131 struct mbuf *m; 1132 1133 GIANT_REQUIRED; 1134 1135 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1136 s = splimp(); 1137 if (!(sc->sc_flags & SC_TBUSY) 1138 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) { 1139 sc->sc_flags |= SC_TBUSY; 1140 splx(s); 1141 (*sc->sc_start)(sc); 1142 } else 1143 splx(s); 1144 for (;;) { 1145 s = splimp(); 1146 IF_DEQUEUE(&sc->sc_rawq, m); 1147 splx(s); 1148 if (m == NULL) 1149 break; 1150 #ifdef MAC 1151 mac_create_mbuf_from_ifnet(&sc->sc_if, m); 1152 #endif 1153 ppp_inproc(sc, m); 1154 } 1155 } 1156 } 1157 1158 #ifdef PPP_COMPRESS 1159 /* 1160 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1161 * 0 if it is about to be transmitted. 1162 */ 1163 static void 1164 ppp_ccp(sc, m, rcvd) 1165 struct ppp_softc *sc; 1166 struct mbuf *m; 1167 int rcvd; 1168 { 1169 u_char *dp, *ep; 1170 struct mbuf *mp; 1171 int slen, s; 1172 1173 /* 1174 * Get a pointer to the data after the PPP header. 1175 */ 1176 if (m->m_len <= PPP_HDRLEN) { 1177 mp = m->m_next; 1178 if (mp == NULL) 1179 return; 1180 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1181 } else { 1182 mp = m; 1183 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1184 } 1185 1186 ep = mtod(mp, u_char *) + mp->m_len; 1187 if (dp + CCP_HDRLEN > ep) 1188 return; 1189 slen = CCP_LENGTH(dp); 1190 if (dp + slen > ep) { 1191 if (sc->sc_flags & SC_DEBUG) 1192 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1193 dp, slen, mtod(mp, u_char *), mp->m_len); 1194 return; 1195 } 1196 1197 switch (CCP_CODE(dp)) { 1198 case CCP_CONFREQ: 1199 case CCP_TERMREQ: 1200 case CCP_TERMACK: 1201 /* CCP must be going down - disable compression */ 1202 if (sc->sc_flags & SC_CCP_UP) { 1203 s = splimp(); 1204 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1205 splx(s); 1206 } 1207 break; 1208 1209 case CCP_CONFACK: 1210 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1211 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1212 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1213 if (!rcvd) { 1214 /* we're agreeing to send compressed packets. */ 1215 if (sc->sc_xc_state != NULL 1216 && (*sc->sc_xcomp->comp_init) 1217 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1218 sc->sc_if.if_dunit, 0, sc->sc_flags & SC_DEBUG)) { 1219 s = splimp(); 1220 sc->sc_flags |= SC_COMP_RUN; 1221 splx(s); 1222 } 1223 } else { 1224 /* peer is agreeing to send compressed packets. */ 1225 if (sc->sc_rc_state != NULL 1226 && (*sc->sc_rcomp->decomp_init) 1227 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1228 sc->sc_if.if_dunit, 0, sc->sc_mru, 1229 sc->sc_flags & SC_DEBUG)) { 1230 s = splimp(); 1231 sc->sc_flags |= SC_DECOMP_RUN; 1232 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1233 splx(s); 1234 } 1235 } 1236 } 1237 break; 1238 1239 case CCP_RESETACK: 1240 if (sc->sc_flags & SC_CCP_UP) { 1241 if (!rcvd) { 1242 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1243 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1244 } else { 1245 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1246 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1247 s = splimp(); 1248 sc->sc_flags &= ~SC_DC_ERROR; 1249 splx(s); 1250 } 1251 } 1252 } 1253 break; 1254 } 1255 } 1256 1257 /* 1258 * CCP is down; free (de)compressor state if necessary. 1259 */ 1260 static void 1261 ppp_ccp_closed(sc) 1262 struct ppp_softc *sc; 1263 { 1264 if (sc->sc_xc_state) { 1265 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1266 sc->sc_xc_state = NULL; 1267 } 1268 if (sc->sc_rc_state) { 1269 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1270 sc->sc_rc_state = NULL; 1271 } 1272 } 1273 #endif /* PPP_COMPRESS */ 1274 1275 /* 1276 * PPP packet input routine. 1277 * The caller has checked and removed the FCS and has inserted 1278 * the address/control bytes and the protocol high byte if they 1279 * were omitted. 1280 */ 1281 void 1282 ppppktin(sc, m, lost) 1283 struct ppp_softc *sc; 1284 struct mbuf *m; 1285 int lost; 1286 { 1287 int s = splimp(); 1288 1289 if (lost) 1290 m->m_flags |= M_ERRMARK; 1291 IF_ENQUEUE(&sc->sc_rawq, m); 1292 schednetisr(NETISR_PPP); 1293 splx(s); 1294 } 1295 1296 /* 1297 * Process a received PPP packet, doing decompression as necessary. 1298 * Should be called at splsoftnet. 1299 */ 1300 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1301 TYPE_UNCOMPRESSED_TCP) 1302 1303 static void 1304 ppp_inproc(sc, m) 1305 struct ppp_softc *sc; 1306 struct mbuf *m; 1307 { 1308 struct ifnet *ifp = &sc->sc_if; 1309 int isr; 1310 int s, ilen = 0, xlen, proto, rv; 1311 u_char *cp, adrs, ctrl; 1312 struct mbuf *mp, *dmp = NULL; 1313 u_char *iphdr; 1314 u_int hlen; 1315 1316 sc->sc_stats.ppp_ipackets++; 1317 1318 if (sc->sc_flags & SC_LOG_INPKT) { 1319 ilen = m_length(m, NULL); 1320 if_printf(ifp, "got %d bytes\n", ilen); 1321 pppdumpm(m); 1322 } 1323 1324 cp = mtod(m, u_char *); 1325 adrs = PPP_ADDRESS(cp); 1326 ctrl = PPP_CONTROL(cp); 1327 proto = PPP_PROTOCOL(cp); 1328 1329 if (m->m_flags & M_ERRMARK) { 1330 m->m_flags &= ~M_ERRMARK; 1331 s = splimp(); 1332 sc->sc_flags |= SC_VJ_RESET; 1333 splx(s); 1334 } 1335 1336 #ifdef PPP_COMPRESS 1337 /* 1338 * Decompress this packet if necessary, update the receiver's 1339 * dictionary, or take appropriate action on a CCP packet. 1340 */ 1341 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1342 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1343 /* decompress this packet */ 1344 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1345 if (rv == DECOMP_OK) { 1346 m_freem(m); 1347 if (dmp == NULL) { 1348 /* no error, but no decompressed packet produced */ 1349 return; 1350 } 1351 m = dmp; 1352 cp = mtod(m, u_char *); 1353 proto = PPP_PROTOCOL(cp); 1354 1355 } else { 1356 /* 1357 * An error has occurred in decompression. 1358 * Pass the compressed packet up to pppd, which may take 1359 * CCP down or issue a Reset-Req. 1360 */ 1361 if (sc->sc_flags & SC_DEBUG) 1362 if_printf(ifp, "decompress failed %d\n", rv); 1363 s = splimp(); 1364 sc->sc_flags |= SC_VJ_RESET; 1365 if (rv == DECOMP_ERROR) 1366 sc->sc_flags |= SC_DC_ERROR; 1367 else 1368 sc->sc_flags |= SC_DC_FERROR; 1369 splx(s); 1370 } 1371 1372 } else { 1373 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1374 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1375 } 1376 if (proto == PPP_CCP) { 1377 ppp_ccp(sc, m, 1); 1378 } 1379 } 1380 #endif 1381 1382 ilen = m_length(m, NULL); 1383 1384 #ifdef VJC 1385 if (sc->sc_flags & SC_VJ_RESET) { 1386 /* 1387 * If we've missed a packet, we must toss subsequent compressed 1388 * packets which don't have an explicit connection ID. 1389 */ 1390 if (sc->sc_comp) 1391 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1392 s = splimp(); 1393 sc->sc_flags &= ~SC_VJ_RESET; 1394 splx(s); 1395 } 1396 1397 /* 1398 * See if we have a VJ-compressed packet to uncompress. 1399 */ 1400 if (proto == PPP_VJC_COMP) { 1401 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1402 goto bad; 1403 1404 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1405 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1406 sc->sc_comp, &iphdr, &hlen); 1407 1408 if (xlen <= 0) { 1409 if (sc->sc_flags & SC_DEBUG) 1410 if_printf(ifp, "VJ uncompress failed on type comp\n"); 1411 goto bad; 1412 } 1413 1414 /* Copy the PPP and IP headers into a new mbuf. */ 1415 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1416 if (mp == NULL) 1417 goto bad; 1418 mp->m_len = 0; 1419 mp->m_next = NULL; 1420 if (hlen + PPP_HDRLEN > MHLEN) { 1421 MCLGET(mp, M_DONTWAIT); 1422 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1423 m_freem(mp); 1424 goto bad; /* lose if big headers and no clusters */ 1425 } 1426 } 1427 #ifdef MAC 1428 mac_create_mbuf_from_mbuf(m, mp); 1429 #endif 1430 cp = mtod(mp, u_char *); 1431 cp[0] = adrs; 1432 cp[1] = ctrl; 1433 cp[2] = 0; 1434 cp[3] = PPP_IP; 1435 proto = PPP_IP; 1436 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1437 mp->m_len = hlen + PPP_HDRLEN; 1438 1439 /* 1440 * Trim the PPP and VJ headers off the old mbuf 1441 * and stick the new and old mbufs together. 1442 */ 1443 m->m_data += PPP_HDRLEN + xlen; 1444 m->m_len -= PPP_HDRLEN + xlen; 1445 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1446 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1447 mp->m_len += m->m_len; 1448 mp->m_next = m_free(m); 1449 } else { 1450 mp->m_next = m; 1451 } 1452 m = mp; 1453 ilen += hlen - xlen; 1454 1455 } else if (proto == PPP_VJC_UNCOMP) { 1456 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1457 goto bad; 1458 1459 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1460 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1461 sc->sc_comp, &iphdr, &hlen); 1462 1463 if (xlen < 0) { 1464 if (sc->sc_flags & SC_DEBUG) 1465 if_printf(ifp, "VJ uncompress failed on type uncomp\n"); 1466 goto bad; 1467 } 1468 1469 proto = PPP_IP; 1470 cp[3] = PPP_IP; 1471 } 1472 #endif /* VJC */ 1473 1474 /* 1475 * If the packet will fit in a header mbuf, don't waste a 1476 * whole cluster on it. 1477 */ 1478 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1479 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1480 if (mp != NULL) { 1481 #ifdef MAC 1482 mac_create_mbuf_from_mbuf(m, mp); 1483 #endif 1484 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1485 m_freem(m); 1486 m = mp; 1487 m->m_len = ilen; 1488 } 1489 } 1490 m->m_pkthdr.len = ilen; 1491 m->m_pkthdr.rcvif = ifp; 1492 1493 if ((proto & 0x8000) == 0) { 1494 #ifdef PPP_FILTER 1495 /* 1496 * See whether we want to pass this packet, and 1497 * if it counts as link activity. 1498 */ 1499 adrs = *mtod(m, u_char *); /* save address field */ 1500 *mtod(m, u_char *) = 0; /* indicate inbound */ 1501 if (sc->sc_pass_filt.bf_insns != 0 1502 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1503 ilen, 0) == 0) { 1504 /* drop this packet */ 1505 m_freem(m); 1506 return; 1507 } 1508 if (sc->sc_active_filt.bf_insns == 0 1509 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1510 sc->sc_last_recv = time_second; 1511 1512 *mtod(m, u_char *) = adrs; 1513 #else 1514 /* 1515 * Record the time that we received this packet. 1516 */ 1517 sc->sc_last_recv = time_second; 1518 #endif /* PPP_FILTER */ 1519 } 1520 1521 /* See if bpf wants to look at the packet. */ 1522 BPF_MTAP(&sc->sc_if, m); 1523 1524 isr = -1; 1525 switch (proto) { 1526 #ifdef INET 1527 case PPP_IP: 1528 /* 1529 * IP packet - take off the ppp header and pass it up to IP. 1530 */ 1531 if ((ifp->if_flags & IFF_UP) == 0 1532 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1533 /* interface is down - drop the packet. */ 1534 m_freem(m); 1535 return; 1536 } 1537 m->m_pkthdr.len -= PPP_HDRLEN; 1538 m->m_data += PPP_HDRLEN; 1539 m->m_len -= PPP_HDRLEN; 1540 if (ip_fastforward(m)) 1541 return; 1542 isr = NETISR_IP; 1543 break; 1544 #endif 1545 #ifdef IPX 1546 case PPP_IPX: 1547 /* 1548 * IPX packet - take off the ppp header and pass it up to IPX. 1549 */ 1550 if ((sc->sc_if.if_flags & IFF_UP) == 0 1551 /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) { 1552 /* interface is down - drop the packet. */ 1553 m_freem(m); 1554 return; 1555 } 1556 m->m_pkthdr.len -= PPP_HDRLEN; 1557 m->m_data += PPP_HDRLEN; 1558 m->m_len -= PPP_HDRLEN; 1559 isr = NETISR_IPX; 1560 sc->sc_last_recv = time_second; /* update time of last pkt rcvd */ 1561 break; 1562 #endif 1563 1564 default: 1565 /* 1566 * Some other protocol - place on input queue for read(). 1567 */ 1568 break; 1569 } 1570 1571 if (isr == -1) 1572 rv = IF_HANDOFF(&sc->sc_inq, m, NULL); 1573 else 1574 rv = netisr_queue(isr, m); 1575 if (!rv) { 1576 if (sc->sc_flags & SC_DEBUG) 1577 if_printf(ifp, "input queue full\n"); 1578 ifp->if_iqdrops++; 1579 goto bad; 1580 } 1581 ifp->if_ipackets++; 1582 ifp->if_ibytes += ilen; 1583 getmicrotime(&ifp->if_lastchange); 1584 1585 if (isr == -1) 1586 (*sc->sc_ctlp)(sc); 1587 1588 return; 1589 1590 bad: 1591 if (m) 1592 m_freem(m); 1593 sc->sc_if.if_ierrors++; 1594 sc->sc_stats.ppp_ierrors++; 1595 } 1596 1597 #define MAX_DUMP_BYTES 128 1598 1599 static void 1600 pppdumpm(m0) 1601 struct mbuf *m0; 1602 { 1603 char buf[3*MAX_DUMP_BYTES+4]; 1604 char *bp = buf; 1605 struct mbuf *m; 1606 1607 for (m = m0; m; m = m->m_next) { 1608 int l = m->m_len; 1609 u_char *rptr = (u_char *)m->m_data; 1610 1611 while (l--) { 1612 if (bp > buf + (sizeof(buf) - 4)) 1613 goto done; 1614 *bp++ = hex2ascii(*rptr >> 4); 1615 *bp++ = hex2ascii(*rptr++ & 0xf); 1616 } 1617 1618 if (m->m_next) { 1619 if (bp > buf + (sizeof(buf) - 3)) 1620 goto done; 1621 *bp++ = '|'; 1622 } else 1623 *bp++ = ' '; 1624 } 1625 done: 1626 if (m) 1627 *bp++ = '>'; 1628 *bp = 0; 1629 printf("%s\n", buf); 1630 }
Cache object: a88e4c060ccf6644876a814045cb7b00
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