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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/5.3/sys/net/if_ppp.c 136588 2004-10-16 08:43:07Z cvs2svn $ */ 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_clone.h> 101 #include <net/if_types.h> 102 #include <net/netisr.h> 103 #include <net/bpf.h> 104 105 #if INET 106 #include <netinet/in.h> 107 #include <netinet/in_systm.h> 108 #include <netinet/in_var.h> 109 #include <netinet/ip.h> 110 #endif 111 112 #if IPX 113 #include <netipx/ipx.h> 114 #include <netipx/ipx_if.h> 115 #endif 116 117 #ifdef VJC 118 #include <net/slcompress.h> 119 #endif 120 121 #include <net/if_ppp.h> 122 #include <net/if_pppvar.h> 123 124 /* minimise diffs */ 125 #ifndef splsoftnet 126 #define splsoftnet splnet 127 #endif 128 129 #ifdef PPP_COMPRESS 130 #define PACKETPTR struct mbuf * 131 #include <net/ppp_comp.h> 132 #endif 133 134 #define PPPNAME "ppp" 135 static MALLOC_DEFINE(M_PPP, PPPNAME, "PPP interface"); 136 137 static struct mtx ppp_softc_list_mtx; 138 static LIST_HEAD(, ppp_softc) ppp_softc_list; 139 140 #define PPP_LIST_LOCK_INIT() mtx_init(&ppp_softc_list_mtx, \ 141 "ppp_softc_list_mtx", NULL, MTX_DEF) 142 #define PPP_LIST_LOCK_DESTROY() mtx_destroy(&ppp_softc_list_mtx) 143 #define PPP_LIST_LOCK() mtx_lock(&ppp_softc_list_mtx) 144 #define PPP_LIST_UNLOCK() mtx_unlock(&ppp_softc_list_mtx) 145 146 /* XXX layering violation */ 147 extern void pppasyncattach(void *); 148 extern void pppasyncdetach(void); 149 150 static int pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 151 static void pppintr(void); 152 153 static void ppp_requeue(struct ppp_softc *); 154 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 155 static void ppp_ccp_closed(struct ppp_softc *); 156 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 157 static void pppdumpm(struct mbuf *m0); 158 static int ppp_clone_create(struct if_clone *, int); 159 static void ppp_clone_destroy(struct ifnet *); 160 161 IFC_SIMPLE_DECLARE(ppp, 0); 162 163 /* 164 * Some useful mbuf macros not in mbuf.h. 165 */ 166 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 167 168 #define M_DATASTART(m) \ 169 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 170 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 171 172 #define M_DATASIZE(m) \ 173 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 174 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 175 176 /* 177 * We steal two bits in the mbuf m_flags, to mark high-priority packets 178 * for output, and received packets following lost/corrupted packets. 179 */ 180 #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ 181 #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ 182 183 184 #ifdef PPP_COMPRESS 185 /* 186 * List of compressors we know about. 187 * We leave some space so maybe we can modload compressors. 188 */ 189 190 extern struct compressor ppp_bsd_compress; 191 extern struct compressor ppp_deflate, ppp_deflate_draft; 192 193 static struct compressor *ppp_compressors[8] = { 194 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 195 &ppp_bsd_compress, 196 #endif 197 #if DO_DEFLATE && defined(PPP_DEFLATE) 198 &ppp_deflate, 199 &ppp_deflate_draft, 200 #endif 201 NULL 202 }; 203 #endif /* PPP_COMPRESS */ 204 205 static int 206 ppp_clone_create(struct if_clone *ifc, int unit) 207 { 208 struct ppp_softc *sc; 209 210 sc = malloc(sizeof(struct ppp_softc), M_PPP, M_WAITOK | M_ZERO); 211 sc->sc_if.if_softc = sc; 212 if_initname(&sc->sc_if, ifc->ifc_name, unit); 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_ioctl = pppsioctl; 218 sc->sc_if.if_output = pppoutput; 219 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 220 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 221 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 222 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 223 mtx_init(&sc->sc_inq.ifq_mtx, "ppp_inq", NULL, MTX_DEF); 224 mtx_init(&sc->sc_fastq.ifq_mtx, "ppp_fastq", NULL, MTX_DEF); 225 mtx_init(&sc->sc_rawq.ifq_mtx, "ppp_rawq", NULL, MTX_DEF); 226 if_attach(&sc->sc_if); 227 bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN); 228 229 PPP_LIST_LOCK(); 230 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); 231 PPP_LIST_UNLOCK(); 232 233 return (0); 234 } 235 236 static void 237 ppp_destroy(struct ppp_softc *sc) 238 { 239 struct ifnet *ifp; 240 241 ifp = &sc->sc_if; 242 bpfdetach(ifp); 243 if_detach(ifp); 244 mtx_destroy(&sc->sc_rawq.ifq_mtx); 245 mtx_destroy(&sc->sc_fastq.ifq_mtx); 246 mtx_destroy(&sc->sc_inq.ifq_mtx); 247 free(sc, M_PPP); 248 } 249 250 static void 251 ppp_clone_destroy(struct ifnet *ifp) 252 { 253 struct ppp_softc *sc; 254 255 sc = ifp->if_softc; 256 PPP_LIST_LOCK(); 257 LIST_REMOVE(sc, sc_list); 258 PPP_LIST_UNLOCK(); 259 ppp_destroy(sc); 260 } 261 262 static int 263 ppp_modevent(module_t mod, int type, void *data) 264 { 265 struct ppp_softc *sc; 266 267 switch (type) { 268 case MOD_LOAD: 269 PPP_LIST_LOCK_INIT(); 270 LIST_INIT(&ppp_softc_list); 271 if_clone_attach(&ppp_cloner); 272 273 netisr_register(NETISR_PPP, (netisr_t *)pppintr, NULL, 0); 274 /* 275 * XXX layering violation - if_ppp can work over any lower 276 * level transport that cares to attach to it. 277 */ 278 pppasyncattach(NULL); 279 break; 280 case MOD_UNLOAD: 281 /* XXX: layering violation */ 282 pppasyncdetach(); 283 284 netisr_unregister(NETISR_PPP); 285 286 if_clone_detach(&ppp_cloner); 287 288 PPP_LIST_LOCK(); 289 while ((sc = LIST_FIRST(&ppp_softc_list)) != NULL) { 290 LIST_REMOVE(sc, sc_list); 291 PPP_LIST_UNLOCK(); 292 ppp_destroy(sc); 293 PPP_LIST_LOCK(); 294 } 295 PPP_LIST_LOCK_DESTROY(); 296 break; 297 default: 298 return EOPNOTSUPP; 299 } 300 return 0; 301 } 302 303 static moduledata_t ppp_mod = { 304 "if_ppp", 305 ppp_modevent, 306 0 307 }; 308 309 DECLARE_MODULE(if_ppp, ppp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 310 311 /* 312 * Allocate a ppp interface unit and initialize it. 313 */ 314 struct ppp_softc * 315 pppalloc(pid) 316 pid_t pid; 317 { 318 int i; 319 char tmpname[IFNAMSIZ]; 320 struct ifnet *ifp; 321 struct ppp_softc *sc; 322 323 PPP_LIST_LOCK(); 324 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 325 if (sc->sc_xfer == pid) { 326 sc->sc_xfer = 0; 327 PPP_LIST_UNLOCK(); 328 return sc; 329 } 330 } 331 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 332 if (sc->sc_devp == NULL) 333 break; 334 } 335 PPP_LIST_UNLOCK(); 336 /* Try to clone an interface if we don't have a free one */ 337 if (sc == NULL) { 338 strcpy(tmpname, PPPNAME); 339 if (if_clone_create(tmpname, sizeof(tmpname)) != 0) 340 return NULL; 341 ifp = ifunit(tmpname); 342 if (ifp == NULL) 343 return NULL; 344 sc = ifp->if_softc; 345 } 346 if (sc == NULL || sc->sc_devp != NULL) 347 return NULL; 348 349 sc->sc_flags = 0; 350 sc->sc_mru = PPP_MRU; 351 sc->sc_relinq = NULL; 352 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); 353 #ifdef VJC 354 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 355 M_DEVBUF, M_NOWAIT); 356 if (sc->sc_comp) 357 sl_compress_init(sc->sc_comp, -1); 358 #endif 359 #ifdef PPP_COMPRESS 360 sc->sc_xc_state = NULL; 361 sc->sc_rc_state = NULL; 362 #endif /* PPP_COMPRESS */ 363 for (i = 0; i < NUM_NP; ++i) 364 sc->sc_npmode[i] = NPMODE_ERROR; 365 sc->sc_npqueue = NULL; 366 sc->sc_npqtail = &sc->sc_npqueue; 367 sc->sc_last_sent = sc->sc_last_recv = time_second; 368 369 return sc; 370 } 371 372 /* 373 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 374 */ 375 void 376 pppdealloc(sc) 377 struct ppp_softc *sc; 378 { 379 struct mbuf *m; 380 381 if_down(&sc->sc_if); 382 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 383 getmicrotime(&sc->sc_if.if_lastchange); 384 sc->sc_devp = NULL; 385 sc->sc_xfer = 0; 386 IF_DRAIN(&sc->sc_rawq); 387 IF_DRAIN(&sc->sc_inq); 388 IF_DRAIN(&sc->sc_fastq); 389 while ((m = sc->sc_npqueue) != NULL) { 390 sc->sc_npqueue = m->m_nextpkt; 391 m_freem(m); 392 } 393 #ifdef PPP_COMPRESS 394 ppp_ccp_closed(sc); 395 sc->sc_xc_state = NULL; 396 sc->sc_rc_state = NULL; 397 #endif /* PPP_COMPRESS */ 398 #ifdef PPP_FILTER 399 if (sc->sc_pass_filt.bf_insns != 0) { 400 free(sc->sc_pass_filt.bf_insns, M_DEVBUF); 401 sc->sc_pass_filt.bf_insns = 0; 402 sc->sc_pass_filt.bf_len = 0; 403 } 404 if (sc->sc_active_filt.bf_insns != 0) { 405 free(sc->sc_active_filt.bf_insns, M_DEVBUF); 406 sc->sc_active_filt.bf_insns = 0; 407 sc->sc_active_filt.bf_len = 0; 408 } 409 #endif /* PPP_FILTER */ 410 #ifdef VJC 411 if (sc->sc_comp != 0) { 412 free(sc->sc_comp, M_DEVBUF); 413 sc->sc_comp = 0; 414 } 415 #endif 416 } 417 418 /* 419 * Ioctl routine for generic ppp devices. 420 */ 421 int 422 pppioctl(sc, cmd, data, flag, td) 423 struct ppp_softc *sc; 424 u_long cmd; 425 caddr_t data; 426 int flag; 427 struct thread *td; 428 { 429 struct proc *p = td->td_proc; 430 int s, flags, mru, npx; 431 u_int nb; 432 int error = 0; 433 struct ppp_option_data *odp; 434 struct compressor **cp; 435 struct npioctl *npi; 436 time_t t; 437 #ifdef PPP_FILTER 438 struct bpf_program *bp, *nbp; 439 struct bpf_insn *newcode, *oldcode; 440 int newcodelen; 441 #endif /* PPP_FILTER */ 442 #ifdef PPP_COMPRESS 443 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 444 #endif 445 446 switch (cmd) { 447 case FIONREAD: 448 *(int *)data = sc->sc_inq.ifq_len; 449 break; 450 451 case PPPIOCGUNIT: 452 *(int *)data = sc->sc_if.if_dunit; 453 break; 454 455 case PPPIOCGFLAGS: 456 *(u_int *)data = sc->sc_flags; 457 break; 458 459 case PPPIOCSFLAGS: 460 if ((error = suser(td)) != 0) 461 break; 462 flags = *(int *)data & SC_MASK; 463 s = splsoftnet(); 464 #ifdef PPP_COMPRESS 465 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 466 ppp_ccp_closed(sc); 467 #endif 468 splimp(); 469 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 470 splx(s); 471 break; 472 473 case PPPIOCSMRU: 474 if ((error = suser(td)) != 0) 475 return (error); 476 mru = *(int *)data; 477 if (mru >= PPP_MRU && mru <= PPP_MAXMRU) 478 sc->sc_mru = mru; 479 break; 480 481 case PPPIOCGMRU: 482 *(int *)data = sc->sc_mru; 483 break; 484 485 #ifdef VJC 486 case PPPIOCSMAXCID: 487 if ((error = suser(td)) != 0) 488 break; 489 if (sc->sc_comp) { 490 s = splsoftnet(); 491 sl_compress_init(sc->sc_comp, *(int *)data); 492 splx(s); 493 } 494 break; 495 #endif 496 497 case PPPIOCXFERUNIT: 498 if ((error = suser(td)) != 0) 499 break; 500 sc->sc_xfer = p->p_pid; 501 break; 502 503 #ifdef PPP_COMPRESS 504 case PPPIOCSCOMPRESS: 505 if ((error = suser(td)) != 0) 506 break; 507 odp = (struct ppp_option_data *) data; 508 nb = odp->length; 509 if (nb > sizeof(ccp_option)) 510 nb = sizeof(ccp_option); 511 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 512 break; 513 if (ccp_option[1] < 2) { /* preliminary check on the length byte */ 514 error = EINVAL; 515 break; 516 } 517 for (cp = ppp_compressors; *cp != NULL; ++cp) 518 if ((*cp)->compress_proto == ccp_option[0]) { 519 /* 520 * Found a handler for the protocol - try to allocate 521 * a compressor or decompressor. 522 */ 523 error = 0; 524 if (odp->transmit) { 525 s = splsoftnet(); 526 if (sc->sc_xc_state != NULL) 527 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 528 sc->sc_xcomp = *cp; 529 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 530 if (sc->sc_xc_state == NULL) { 531 if (sc->sc_flags & SC_DEBUG) 532 if_printf(&sc->sc_if, "comp_alloc failed\n"); 533 error = ENOBUFS; 534 } 535 splimp(); 536 sc->sc_flags &= ~SC_COMP_RUN; 537 splx(s); 538 } else { 539 s = splsoftnet(); 540 if (sc->sc_rc_state != NULL) 541 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 542 sc->sc_rcomp = *cp; 543 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 544 if (sc->sc_rc_state == NULL) { 545 if (sc->sc_flags & SC_DEBUG) 546 if_printf(&sc->sc_if, "decomp_alloc failed\n"); 547 error = ENOBUFS; 548 } 549 splimp(); 550 sc->sc_flags &= ~SC_DECOMP_RUN; 551 splx(s); 552 } 553 break; 554 } 555 if (sc->sc_flags & SC_DEBUG) 556 if_printf(&sc->sc_if, "no compressor for [%x %x %x], %x\n", 557 ccp_option[0], ccp_option[1], ccp_option[2], nb); 558 error = EINVAL; /* no handler found */ 559 break; 560 #endif /* PPP_COMPRESS */ 561 562 case PPPIOCGNPMODE: 563 case PPPIOCSNPMODE: 564 npi = (struct npioctl *) data; 565 npx = 0; /* XXX: quiet gcc */ 566 switch (npi->protocol) { 567 case PPP_IP: 568 npx = NP_IP; 569 break; 570 default: 571 error = EINVAL; 572 } 573 if (error) 574 break; 575 if (cmd == PPPIOCGNPMODE) { 576 npi->mode = sc->sc_npmode[npx]; 577 } else { 578 if ((error = suser(td)) != 0) 579 break; 580 if (npi->mode != sc->sc_npmode[npx]) { 581 s = splsoftnet(); 582 sc->sc_npmode[npx] = npi->mode; 583 if (npi->mode != NPMODE_QUEUE) { 584 ppp_requeue(sc); 585 (*sc->sc_start)(sc); 586 } 587 splx(s); 588 } 589 } 590 break; 591 592 case PPPIOCGIDLE: 593 s = splsoftnet(); 594 t = time_second; 595 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 596 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 597 splx(s); 598 break; 599 600 #ifdef PPP_FILTER 601 case PPPIOCSPASS: 602 case PPPIOCSACTIVE: 603 nbp = (struct bpf_program *) data; 604 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) { 605 error = EINVAL; 606 break; 607 } 608 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 609 if (newcodelen != 0) { 610 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); 611 if (newcode == 0) { 612 error = EINVAL; /* or sumpin */ 613 break; 614 } 615 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 616 newcodelen)) != 0) { 617 free(newcode, M_DEVBUF); 618 break; 619 } 620 if (!bpf_validate(newcode, nbp->bf_len)) { 621 free(newcode, M_DEVBUF); 622 error = EINVAL; 623 break; 624 } 625 } else 626 newcode = 0; 627 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; 628 oldcode = bp->bf_insns; 629 s = splimp(); 630 bp->bf_len = nbp->bf_len; 631 bp->bf_insns = newcode; 632 splx(s); 633 if (oldcode != 0) 634 free(oldcode, M_DEVBUF); 635 break; 636 #endif 637 638 default: 639 error = ENOIOCTL; 640 break; 641 } 642 return (error); 643 } 644 645 /* 646 * Process an ioctl request to the ppp network interface. 647 */ 648 static int 649 pppsioctl(ifp, cmd, data) 650 register struct ifnet *ifp; 651 u_long cmd; 652 caddr_t data; 653 { 654 struct thread *td = curthread; /* XXX */ 655 register struct ppp_softc *sc = ifp->if_softc; 656 register struct ifaddr *ifa = (struct ifaddr *)data; 657 register struct ifreq *ifr = (struct ifreq *)data; 658 struct ppp_stats *psp; 659 #ifdef PPP_COMPRESS 660 struct ppp_comp_stats *pcp; 661 #endif 662 int s = splimp(), error = 0; 663 664 switch (cmd) { 665 case SIOCSIFFLAGS: 666 if ((ifp->if_flags & IFF_RUNNING) == 0) 667 ifp->if_flags &= ~IFF_UP; 668 break; 669 670 case SIOCSIFADDR: 671 case SIOCAIFADDR: 672 switch(ifa->ifa_addr->sa_family) { 673 #ifdef INET 674 case AF_INET: 675 break; 676 #endif 677 #ifdef IPX 678 case AF_IPX: 679 break; 680 #endif 681 default: 682 error = EAFNOSUPPORT; 683 break; 684 } 685 break; 686 687 case SIOCSIFDSTADDR: 688 switch(ifa->ifa_addr->sa_family) { 689 #ifdef INET 690 case AF_INET: 691 break; 692 #endif 693 #ifdef IPX 694 case AF_IPX: 695 break; 696 #endif 697 default: 698 error = EAFNOSUPPORT; 699 break; 700 } 701 break; 702 703 case SIOCSIFMTU: 704 if ((error = suser(td)) != 0) 705 break; 706 if (ifr->ifr_mtu > PPP_MAXMTU) 707 error = EINVAL; 708 else { 709 sc->sc_if.if_mtu = ifr->ifr_mtu; 710 if (sc->sc_setmtu) 711 (*sc->sc_setmtu)(sc); 712 } 713 break; 714 715 case SIOCGIFMTU: 716 ifr->ifr_mtu = sc->sc_if.if_mtu; 717 break; 718 719 case SIOCADDMULTI: 720 case SIOCDELMULTI: 721 if (ifr == 0) { 722 error = EAFNOSUPPORT; 723 break; 724 } 725 switch(ifr->ifr_addr.sa_family) { 726 #ifdef INET 727 case AF_INET: 728 break; 729 #endif 730 default: 731 error = EAFNOSUPPORT; 732 break; 733 } 734 break; 735 736 case SIOCGPPPSTATS: 737 psp = &((struct ifpppstatsreq *) data)->stats; 738 bzero(psp, sizeof(*psp)); 739 psp->p = sc->sc_stats; 740 #if defined(VJC) && !defined(SL_NO_STATS) 741 if (sc->sc_comp) { 742 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 743 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 744 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 745 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 746 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 747 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 748 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 749 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 750 } 751 #endif /* VJC */ 752 break; 753 754 #ifdef PPP_COMPRESS 755 case SIOCGPPPCSTATS: 756 pcp = &((struct ifpppcstatsreq *) data)->stats; 757 bzero(pcp, sizeof(*pcp)); 758 if (sc->sc_xc_state != NULL) 759 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 760 if (sc->sc_rc_state != NULL) 761 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 762 break; 763 #endif /* PPP_COMPRESS */ 764 765 default: 766 error = ENOTTY; 767 } 768 splx(s); 769 return (error); 770 } 771 772 /* 773 * Queue a packet. Start transmission if not active. 774 * Packet is placed in Information field of PPP frame. 775 * Called at splnet as the if->if_output handler. 776 * Called at splnet from pppwrite(). 777 */ 778 int 779 pppoutput(ifp, m0, dst, rtp) 780 struct ifnet *ifp; 781 struct mbuf *m0; 782 struct sockaddr *dst; 783 struct rtentry *rtp; 784 { 785 register struct ppp_softc *sc = ifp->if_softc; 786 int protocol, address, control; 787 u_char *cp; 788 int s, error; 789 struct ip *ip; 790 struct ifqueue *ifq; 791 enum NPmode mode; 792 int len; 793 794 #ifdef MAC 795 error = mac_check_ifnet_transmit(ifp, m0); 796 if (error) 797 goto bad; 798 #endif 799 800 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 801 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 802 error = ENETDOWN; /* sort of */ 803 goto bad; 804 } 805 806 /* 807 * Compute PPP header. 808 */ 809 m0->m_flags &= ~M_HIGHPRI; 810 switch (dst->sa_family) { 811 #ifdef INET 812 case AF_INET: 813 address = PPP_ALLSTATIONS; 814 control = PPP_UI; 815 protocol = PPP_IP; 816 mode = sc->sc_npmode[NP_IP]; 817 818 /* 819 * If this packet has the "low delay" bit set in the IP header, 820 * put it on the fastq instead. 821 */ 822 ip = mtod(m0, struct ip *); 823 if (ip->ip_tos & IPTOS_LOWDELAY) 824 m0->m_flags |= M_HIGHPRI; 825 break; 826 #endif 827 #ifdef IPX 828 case AF_IPX: 829 /* 830 * This is pretty bogus.. We dont have an ipxcp module in pppd 831 * yet to configure the link parameters. Sigh. I guess a 832 * manual ifconfig would do.... -Peter 833 */ 834 address = PPP_ALLSTATIONS; 835 control = PPP_UI; 836 protocol = PPP_IPX; 837 mode = NPMODE_PASS; 838 break; 839 #endif 840 case AF_UNSPEC: 841 address = PPP_ADDRESS(dst->sa_data); 842 control = PPP_CONTROL(dst->sa_data); 843 protocol = PPP_PROTOCOL(dst->sa_data); 844 mode = NPMODE_PASS; 845 break; 846 default: 847 if_printf(ifp, "af%d not supported\n", dst->sa_family); 848 error = EAFNOSUPPORT; 849 goto bad; 850 } 851 852 /* 853 * Drop this packet, or return an error, if necessary. 854 */ 855 if (mode == NPMODE_ERROR) { 856 error = ENETDOWN; 857 goto bad; 858 } 859 if (mode == NPMODE_DROP) { 860 error = 0; 861 goto bad; 862 } 863 864 /* 865 * Add PPP header. If no space in first mbuf, allocate another. 866 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 867 */ 868 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 869 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 870 if (m0 == 0) { 871 error = ENOBUFS; 872 goto bad; 873 } 874 m0->m_len = 0; 875 } else 876 m0->m_data -= PPP_HDRLEN; 877 878 cp = mtod(m0, u_char *); 879 *cp++ = address; 880 *cp++ = control; 881 *cp++ = protocol >> 8; 882 *cp++ = protocol & 0xff; 883 m0->m_len += PPP_HDRLEN; 884 885 len = m_length(m0, NULL); 886 887 if (sc->sc_flags & SC_LOG_OUTPKT) { 888 printf("%s output: ", ifp->if_xname); 889 pppdumpm(m0); 890 } 891 892 if ((protocol & 0x8000) == 0) { 893 #ifdef PPP_FILTER 894 /* 895 * Apply the pass and active filters to the packet, 896 * but only if it is a data packet. 897 */ 898 *mtod(m0, u_char *) = 1; /* indicates outbound */ 899 if (sc->sc_pass_filt.bf_insns != 0 900 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, 901 len, 0) == 0) { 902 error = 0; /* drop this packet */ 903 goto bad; 904 } 905 906 /* 907 * Update the time we sent the most recent packet. 908 */ 909 if (sc->sc_active_filt.bf_insns == 0 910 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) 911 sc->sc_last_sent = time_second; 912 913 *mtod(m0, u_char *) = address; 914 #else 915 /* 916 * Update the time we sent the most recent data packet. 917 */ 918 sc->sc_last_sent = time_second; 919 #endif /* PPP_FILTER */ 920 } 921 922 /* 923 * See if bpf wants to look at the packet. 924 */ 925 BPF_MTAP(ifp, m0); 926 927 /* 928 * Put the packet on the appropriate queue. 929 */ 930 s = splsoftnet(); /* redundant */ 931 if (mode == NPMODE_QUEUE) { 932 /* XXX we should limit the number of packets on this queue */ 933 *sc->sc_npqtail = m0; 934 m0->m_nextpkt = NULL; 935 sc->sc_npqtail = &m0->m_nextpkt; 936 } else { 937 /* fastq and if_snd are emptied at spl[soft]net now */ 938 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: 939 (struct ifqueue *)&ifp->if_snd; 940 IF_LOCK(ifq); 941 if (_IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 942 _IF_DROP(ifq); 943 IF_UNLOCK(ifq); 944 sc->sc_if.if_oerrors++; 945 sc->sc_stats.ppp_oerrors++; 946 error = ENOBUFS; 947 goto bad; 948 } 949 _IF_ENQUEUE(ifq, m0); 950 IF_UNLOCK(ifq); 951 (*sc->sc_start)(sc); 952 } 953 getmicrotime(&ifp->if_lastchange); 954 ifp->if_opackets++; 955 ifp->if_obytes += len; 956 957 splx(s); 958 return (0); 959 960 bad: 961 m_freem(m0); 962 return (error); 963 } 964 965 /* 966 * After a change in the NPmode for some NP, move packets from the 967 * npqueue to the send queue or the fast queue as appropriate. 968 * Should be called at spl[soft]net. 969 */ 970 static void 971 ppp_requeue(sc) 972 struct ppp_softc *sc; 973 { 974 struct mbuf *m, **mpp; 975 struct ifqueue *ifq; 976 enum NPmode mode; 977 978 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 979 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 980 case PPP_IP: 981 mode = sc->sc_npmode[NP_IP]; 982 break; 983 default: 984 mode = NPMODE_PASS; 985 } 986 987 switch (mode) { 988 case NPMODE_PASS: 989 /* 990 * This packet can now go on one of the queues to be sent. 991 */ 992 *mpp = m->m_nextpkt; 993 m->m_nextpkt = NULL; 994 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: 995 (struct ifqueue *)&sc->sc_if.if_snd; 996 if (! IF_HANDOFF(ifq, m, NULL)) { 997 sc->sc_if.if_oerrors++; 998 sc->sc_stats.ppp_oerrors++; 999 } 1000 break; 1001 1002 case NPMODE_DROP: 1003 case NPMODE_ERROR: 1004 *mpp = m->m_nextpkt; 1005 m_freem(m); 1006 break; 1007 1008 case NPMODE_QUEUE: 1009 mpp = &m->m_nextpkt; 1010 break; 1011 } 1012 } 1013 sc->sc_npqtail = mpp; 1014 } 1015 1016 /* 1017 * Transmitter has finished outputting some stuff; 1018 * remember to call sc->sc_start later at splsoftnet. 1019 */ 1020 void 1021 ppp_restart(sc) 1022 struct ppp_softc *sc; 1023 { 1024 int s = splimp(); 1025 1026 sc->sc_flags &= ~SC_TBUSY; 1027 schednetisr(NETISR_PPP); 1028 splx(s); 1029 } 1030 1031 1032 /* 1033 * Get a packet to send. This procedure is intended to be called at 1034 * splsoftnet, since it may involve time-consuming operations such as 1035 * applying VJ compression, packet compression, address/control and/or 1036 * protocol field compression to the packet. 1037 */ 1038 struct mbuf * 1039 ppp_dequeue(sc) 1040 struct ppp_softc *sc; 1041 { 1042 struct mbuf *m, *mp; 1043 u_char *cp; 1044 int address, control, protocol; 1045 1046 /* 1047 * Grab a packet to send: first try the fast queue, then the 1048 * normal queue. 1049 */ 1050 IF_DEQUEUE(&sc->sc_fastq, m); 1051 if (m == NULL) 1052 IF_DEQUEUE(&sc->sc_if.if_snd, m); 1053 if (m == NULL) 1054 return NULL; 1055 1056 ++sc->sc_stats.ppp_opackets; 1057 1058 /* 1059 * Extract the ppp header of the new packet. 1060 * The ppp header will be in one mbuf. 1061 */ 1062 cp = mtod(m, u_char *); 1063 address = PPP_ADDRESS(cp); 1064 control = PPP_CONTROL(cp); 1065 protocol = PPP_PROTOCOL(cp); 1066 1067 switch (protocol) { 1068 case PPP_IP: 1069 #ifdef VJC 1070 /* 1071 * If the packet is a TCP/IP packet, see if we can compress it. 1072 */ 1073 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1074 struct ip *ip; 1075 int type; 1076 1077 mp = m; 1078 ip = (struct ip *) (cp + PPP_HDRLEN); 1079 if (mp->m_len <= PPP_HDRLEN) { 1080 mp = mp->m_next; 1081 if (mp == NULL) 1082 break; 1083 ip = mtod(mp, struct ip *); 1084 } 1085 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1086 if (ip->ip_p == IPPROTO_TCP) { 1087 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1088 !(sc->sc_flags & SC_NO_TCP_CCID)); 1089 switch (type) { 1090 case TYPE_UNCOMPRESSED_TCP: 1091 protocol = PPP_VJC_UNCOMP; 1092 break; 1093 case TYPE_COMPRESSED_TCP: 1094 protocol = PPP_VJC_COMP; 1095 cp = mtod(m, u_char *); 1096 cp[0] = address; /* header has moved */ 1097 cp[1] = control; 1098 cp[2] = 0; 1099 break; 1100 } 1101 cp[3] = protocol; /* update protocol in PPP header */ 1102 } 1103 } 1104 #endif /* VJC */ 1105 break; 1106 1107 #ifdef PPP_COMPRESS 1108 case PPP_CCP: 1109 ppp_ccp(sc, m, 0); 1110 break; 1111 #endif /* PPP_COMPRESS */ 1112 } 1113 1114 #ifdef PPP_COMPRESS 1115 if (protocol != PPP_LCP && protocol != PPP_CCP 1116 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1117 struct mbuf *mcomp = NULL; 1118 int slen, clen; 1119 1120 slen = m_length(m, NULL); 1121 clen = (*sc->sc_xcomp->compress) 1122 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1123 if (mcomp != NULL) { 1124 if (sc->sc_flags & SC_CCP_UP) { 1125 /* Send the compressed packet instead of the original. */ 1126 m_freem(m); 1127 m = mcomp; 1128 cp = mtod(m, u_char *); 1129 protocol = cp[3]; 1130 } else { 1131 /* Can't transmit compressed packets until CCP is up. */ 1132 m_freem(mcomp); 1133 } 1134 } 1135 } 1136 #endif /* PPP_COMPRESS */ 1137 1138 /* 1139 * Compress the address/control and protocol, if possible. 1140 */ 1141 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1142 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1143 protocol != PPP_LCP) { 1144 /* can compress address/control */ 1145 m->m_data += 2; 1146 m->m_len -= 2; 1147 } 1148 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1149 /* can compress protocol */ 1150 if (mtod(m, u_char *) == cp) { 1151 cp[2] = cp[1]; /* move address/control up */ 1152 cp[1] = cp[0]; 1153 } 1154 ++m->m_data; 1155 --m->m_len; 1156 } 1157 1158 return m; 1159 } 1160 1161 /* 1162 * Software interrupt routine, called at spl[soft]net. 1163 */ 1164 static void 1165 pppintr() 1166 { 1167 struct ppp_softc *sc; 1168 int s; 1169 struct mbuf *m; 1170 1171 GIANT_REQUIRED; 1172 1173 PPP_LIST_LOCK(); 1174 LIST_FOREACH(sc, &ppp_softc_list, sc_list) { 1175 s = splimp(); 1176 if (!(sc->sc_flags & SC_TBUSY) 1177 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) { 1178 sc->sc_flags |= SC_TBUSY; 1179 splx(s); 1180 (*sc->sc_start)(sc); 1181 } else 1182 splx(s); 1183 for (;;) { 1184 s = splimp(); 1185 IF_DEQUEUE(&sc->sc_rawq, m); 1186 splx(s); 1187 if (m == NULL) 1188 break; 1189 #ifdef MAC 1190 mac_create_mbuf_from_ifnet(&sc->sc_if, m); 1191 #endif 1192 ppp_inproc(sc, m); 1193 } 1194 } 1195 PPP_LIST_UNLOCK(); 1196 } 1197 1198 #ifdef PPP_COMPRESS 1199 /* 1200 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1201 * 0 if it is about to be transmitted. 1202 */ 1203 static void 1204 ppp_ccp(sc, m, rcvd) 1205 struct ppp_softc *sc; 1206 struct mbuf *m; 1207 int rcvd; 1208 { 1209 u_char *dp, *ep; 1210 struct mbuf *mp; 1211 int slen, s; 1212 1213 /* 1214 * Get a pointer to the data after the PPP header. 1215 */ 1216 if (m->m_len <= PPP_HDRLEN) { 1217 mp = m->m_next; 1218 if (mp == NULL) 1219 return; 1220 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1221 } else { 1222 mp = m; 1223 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1224 } 1225 1226 ep = mtod(mp, u_char *) + mp->m_len; 1227 if (dp + CCP_HDRLEN > ep) 1228 return; 1229 slen = CCP_LENGTH(dp); 1230 if (dp + slen > ep) { 1231 if (sc->sc_flags & SC_DEBUG) 1232 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1233 dp, slen, mtod(mp, u_char *), mp->m_len); 1234 return; 1235 } 1236 1237 switch (CCP_CODE(dp)) { 1238 case CCP_CONFREQ: 1239 case CCP_TERMREQ: 1240 case CCP_TERMACK: 1241 /* CCP must be going down - disable compression */ 1242 if (sc->sc_flags & SC_CCP_UP) { 1243 s = splimp(); 1244 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1245 splx(s); 1246 } 1247 break; 1248 1249 case CCP_CONFACK: 1250 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1251 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1252 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1253 if (!rcvd) { 1254 /* we're agreeing to send compressed packets. */ 1255 if (sc->sc_xc_state != NULL 1256 && (*sc->sc_xcomp->comp_init) 1257 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1258 sc->sc_if.if_dunit, 0, sc->sc_flags & SC_DEBUG)) { 1259 s = splimp(); 1260 sc->sc_flags |= SC_COMP_RUN; 1261 splx(s); 1262 } 1263 } else { 1264 /* peer is agreeing to send compressed packets. */ 1265 if (sc->sc_rc_state != NULL 1266 && (*sc->sc_rcomp->decomp_init) 1267 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1268 sc->sc_if.if_dunit, 0, sc->sc_mru, 1269 sc->sc_flags & SC_DEBUG)) { 1270 s = splimp(); 1271 sc->sc_flags |= SC_DECOMP_RUN; 1272 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1273 splx(s); 1274 } 1275 } 1276 } 1277 break; 1278 1279 case CCP_RESETACK: 1280 if (sc->sc_flags & SC_CCP_UP) { 1281 if (!rcvd) { 1282 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1283 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1284 } else { 1285 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1286 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1287 s = splimp(); 1288 sc->sc_flags &= ~SC_DC_ERROR; 1289 splx(s); 1290 } 1291 } 1292 } 1293 break; 1294 } 1295 } 1296 1297 /* 1298 * CCP is down; free (de)compressor state if necessary. 1299 */ 1300 static void 1301 ppp_ccp_closed(sc) 1302 struct ppp_softc *sc; 1303 { 1304 if (sc->sc_xc_state) { 1305 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1306 sc->sc_xc_state = NULL; 1307 } 1308 if (sc->sc_rc_state) { 1309 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1310 sc->sc_rc_state = NULL; 1311 } 1312 } 1313 #endif /* PPP_COMPRESS */ 1314 1315 /* 1316 * PPP packet input routine. 1317 * The caller has checked and removed the FCS and has inserted 1318 * the address/control bytes and the protocol high byte if they 1319 * were omitted. 1320 */ 1321 void 1322 ppppktin(sc, m, lost) 1323 struct ppp_softc *sc; 1324 struct mbuf *m; 1325 int lost; 1326 { 1327 int s = splimp(); 1328 1329 if (lost) 1330 m->m_flags |= M_ERRMARK; 1331 IF_ENQUEUE(&sc->sc_rawq, m); 1332 schednetisr(NETISR_PPP); 1333 splx(s); 1334 } 1335 1336 /* 1337 * Process a received PPP packet, doing decompression as necessary. 1338 * Should be called at splsoftnet. 1339 */ 1340 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1341 TYPE_UNCOMPRESSED_TCP) 1342 1343 static void 1344 ppp_inproc(sc, m) 1345 struct ppp_softc *sc; 1346 struct mbuf *m; 1347 { 1348 struct ifnet *ifp = &sc->sc_if; 1349 int isr; 1350 int s, ilen = 0, xlen, proto, rv; 1351 u_char *cp, adrs, ctrl; 1352 struct mbuf *mp, *dmp = NULL; 1353 u_char *iphdr; 1354 u_int hlen; 1355 1356 sc->sc_stats.ppp_ipackets++; 1357 1358 if (sc->sc_flags & SC_LOG_INPKT) { 1359 ilen = m_length(m, NULL); 1360 if_printf(ifp, "got %d bytes\n", ilen); 1361 pppdumpm(m); 1362 } 1363 1364 cp = mtod(m, u_char *); 1365 adrs = PPP_ADDRESS(cp); 1366 ctrl = PPP_CONTROL(cp); 1367 proto = PPP_PROTOCOL(cp); 1368 1369 if (m->m_flags & M_ERRMARK) { 1370 m->m_flags &= ~M_ERRMARK; 1371 s = splimp(); 1372 sc->sc_flags |= SC_VJ_RESET; 1373 splx(s); 1374 } 1375 1376 #ifdef PPP_COMPRESS 1377 /* 1378 * Decompress this packet if necessary, update the receiver's 1379 * dictionary, or take appropriate action on a CCP packet. 1380 */ 1381 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1382 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1383 /* decompress this packet */ 1384 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1385 if (rv == DECOMP_OK) { 1386 m_freem(m); 1387 if (dmp == NULL) { 1388 /* no error, but no decompressed packet produced */ 1389 return; 1390 } 1391 m = dmp; 1392 cp = mtod(m, u_char *); 1393 proto = PPP_PROTOCOL(cp); 1394 1395 } else { 1396 /* 1397 * An error has occurred in decompression. 1398 * Pass the compressed packet up to pppd, which may take 1399 * CCP down or issue a Reset-Req. 1400 */ 1401 if (sc->sc_flags & SC_DEBUG) 1402 if_printf(ifp, "decompress failed %d\n", rv); 1403 s = splimp(); 1404 sc->sc_flags |= SC_VJ_RESET; 1405 if (rv == DECOMP_ERROR) 1406 sc->sc_flags |= SC_DC_ERROR; 1407 else 1408 sc->sc_flags |= SC_DC_FERROR; 1409 splx(s); 1410 } 1411 1412 } else { 1413 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1414 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1415 } 1416 if (proto == PPP_CCP) { 1417 ppp_ccp(sc, m, 1); 1418 } 1419 } 1420 #endif 1421 1422 ilen = m_length(m, NULL); 1423 1424 #ifdef VJC 1425 if (sc->sc_flags & SC_VJ_RESET) { 1426 /* 1427 * If we've missed a packet, we must toss subsequent compressed 1428 * packets which don't have an explicit connection ID. 1429 */ 1430 if (sc->sc_comp) 1431 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1432 s = splimp(); 1433 sc->sc_flags &= ~SC_VJ_RESET; 1434 splx(s); 1435 } 1436 1437 /* 1438 * See if we have a VJ-compressed packet to uncompress. 1439 */ 1440 if (proto == PPP_VJC_COMP) { 1441 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1442 goto bad; 1443 1444 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1445 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1446 sc->sc_comp, &iphdr, &hlen); 1447 1448 if (xlen <= 0) { 1449 if (sc->sc_flags & SC_DEBUG) 1450 if_printf(ifp, "VJ uncompress failed on type comp\n"); 1451 goto bad; 1452 } 1453 1454 /* Copy the PPP and IP headers into a new mbuf. */ 1455 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1456 if (mp == NULL) 1457 goto bad; 1458 mp->m_len = 0; 1459 mp->m_next = NULL; 1460 if (hlen + PPP_HDRLEN > MHLEN) { 1461 MCLGET(mp, M_DONTWAIT); 1462 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1463 m_freem(mp); 1464 goto bad; /* lose if big headers and no clusters */ 1465 } 1466 } 1467 #ifdef MAC 1468 mac_create_mbuf_from_mbuf(m, mp); 1469 #endif 1470 cp = mtod(mp, u_char *); 1471 cp[0] = adrs; 1472 cp[1] = ctrl; 1473 cp[2] = 0; 1474 cp[3] = PPP_IP; 1475 proto = PPP_IP; 1476 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1477 mp->m_len = hlen + PPP_HDRLEN; 1478 1479 /* 1480 * Trim the PPP and VJ headers off the old mbuf 1481 * and stick the new and old mbufs together. 1482 */ 1483 m->m_data += PPP_HDRLEN + xlen; 1484 m->m_len -= PPP_HDRLEN + xlen; 1485 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1486 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1487 mp->m_len += m->m_len; 1488 mp->m_next = m_free(m); 1489 } else { 1490 mp->m_next = m; 1491 } 1492 m = mp; 1493 ilen += hlen - xlen; 1494 1495 } else if (proto == PPP_VJC_UNCOMP) { 1496 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1497 goto bad; 1498 1499 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1500 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1501 sc->sc_comp, &iphdr, &hlen); 1502 1503 if (xlen < 0) { 1504 if (sc->sc_flags & SC_DEBUG) 1505 if_printf(ifp, "VJ uncompress failed on type uncomp\n"); 1506 goto bad; 1507 } 1508 1509 proto = PPP_IP; 1510 cp[3] = PPP_IP; 1511 } 1512 #endif /* VJC */ 1513 1514 /* 1515 * If the packet will fit in a header mbuf, don't waste a 1516 * whole cluster on it. 1517 */ 1518 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1519 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1520 if (mp != NULL) { 1521 #ifdef MAC 1522 mac_create_mbuf_from_mbuf(m, mp); 1523 #endif 1524 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1525 m_freem(m); 1526 m = mp; 1527 m->m_len = ilen; 1528 } 1529 } 1530 m->m_pkthdr.len = ilen; 1531 m->m_pkthdr.rcvif = ifp; 1532 1533 if ((proto & 0x8000) == 0) { 1534 #ifdef PPP_FILTER 1535 /* 1536 * See whether we want to pass this packet, and 1537 * if it counts as link activity. 1538 */ 1539 adrs = *mtod(m, u_char *); /* save address field */ 1540 *mtod(m, u_char *) = 0; /* indicate inbound */ 1541 if (sc->sc_pass_filt.bf_insns != 0 1542 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, 1543 ilen, 0) == 0) { 1544 /* drop this packet */ 1545 m_freem(m); 1546 return; 1547 } 1548 if (sc->sc_active_filt.bf_insns == 0 1549 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) 1550 sc->sc_last_recv = time_second; 1551 1552 *mtod(m, u_char *) = adrs; 1553 #else 1554 /* 1555 * Record the time that we received this packet. 1556 */ 1557 sc->sc_last_recv = time_second; 1558 #endif /* PPP_FILTER */ 1559 } 1560 1561 /* See if bpf wants to look at the packet. */ 1562 BPF_MTAP(&sc->sc_if, m); 1563 1564 isr = -1; 1565 switch (proto) { 1566 #ifdef INET 1567 case PPP_IP: 1568 /* 1569 * IP packet - take off the ppp header and pass it up to IP. 1570 */ 1571 if ((ifp->if_flags & IFF_UP) == 0 1572 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1573 /* interface is down - drop the packet. */ 1574 m_freem(m); 1575 return; 1576 } 1577 m->m_pkthdr.len -= PPP_HDRLEN; 1578 m->m_data += PPP_HDRLEN; 1579 m->m_len -= PPP_HDRLEN; 1580 if (ip_fastforward(m)) 1581 return; 1582 isr = NETISR_IP; 1583 break; 1584 #endif 1585 #ifdef IPX 1586 case PPP_IPX: 1587 /* 1588 * IPX packet - take off the ppp header and pass it up to IPX. 1589 */ 1590 if ((sc->sc_if.if_flags & IFF_UP) == 0 1591 /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) { 1592 /* interface is down - drop the packet. */ 1593 m_freem(m); 1594 return; 1595 } 1596 m->m_pkthdr.len -= PPP_HDRLEN; 1597 m->m_data += PPP_HDRLEN; 1598 m->m_len -= PPP_HDRLEN; 1599 isr = NETISR_IPX; 1600 sc->sc_last_recv = time_second; /* update time of last pkt rcvd */ 1601 break; 1602 #endif 1603 1604 default: 1605 /* 1606 * Some other protocol - place on input queue for read(). 1607 */ 1608 break; 1609 } 1610 1611 if (isr == -1) 1612 rv = IF_HANDOFF(&sc->sc_inq, m, NULL); 1613 else 1614 rv = netisr_queue(isr, m); /* (0) on success. */ 1615 if ((isr == -1 && !rv) || (isr != -1 && rv)) { 1616 if (sc->sc_flags & SC_DEBUG) 1617 if_printf(ifp, "input queue full\n"); 1618 ifp->if_iqdrops++; 1619 m = NULL; 1620 goto bad; 1621 } 1622 ifp->if_ipackets++; 1623 ifp->if_ibytes += ilen; 1624 getmicrotime(&ifp->if_lastchange); 1625 1626 if (isr == -1) 1627 (*sc->sc_ctlp)(sc); 1628 1629 return; 1630 1631 bad: 1632 if (m) 1633 m_freem(m); 1634 sc->sc_if.if_ierrors++; 1635 sc->sc_stats.ppp_ierrors++; 1636 } 1637 1638 #define MAX_DUMP_BYTES 128 1639 1640 static void 1641 pppdumpm(m0) 1642 struct mbuf *m0; 1643 { 1644 char buf[3*MAX_DUMP_BYTES+4]; 1645 char *bp = buf; 1646 struct mbuf *m; 1647 1648 for (m = m0; m; m = m->m_next) { 1649 int l = m->m_len; 1650 u_char *rptr = (u_char *)m->m_data; 1651 1652 while (l--) { 1653 if (bp > buf + (sizeof(buf) - 4)) 1654 goto done; 1655 *bp++ = hex2ascii(*rptr >> 4); 1656 *bp++ = hex2ascii(*rptr++ & 0xf); 1657 } 1658 1659 if (m->m_next) { 1660 if (bp > buf + (sizeof(buf) - 3)) 1661 goto done; 1662 *bp++ = '|'; 1663 } else 1664 *bp++ = ' '; 1665 } 1666 done: 1667 if (m) 1668 *bp++ = '>'; 1669 *bp = 0; 1670 printf("%s\n", buf); 1671 }
Cache object: 66b2e78eb226b1ee2f94f453ccb83a4e
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