if_ppp.c revision 1.73
1 /* $NetBSD: if_ppp.c,v 1.73 2001/11/13 00:49:35 lukem 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 /* 79 * XXX IMP ME HARDER 80 * 81 * This is an explanation of that comment. This code used to use 82 * splimp() to block both network and tty interrupts. However, 83 * that call is deprecated. So, we have replaced the uses of 84 * splimp() with splhigh() in order to applomplish what it needs 85 * to accomplish, and added that happy little comment. 86 */ 87 88 #include <sys/cdefs.h> 89 __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.73 2001/11/13 00:49:35 lukem Exp $"); 90 91 #include "ppp.h" 92 93 #include "opt_inet.h" 94 #include "opt_gateway.h" 95 #include "opt_ppp.h" 96 97 #ifdef INET 98 #define VJC 99 #endif 100 #define PPP_COMPRESS 101 102 #include <sys/param.h> 103 #include <sys/proc.h> 104 #include <sys/mbuf.h> 105 #include <sys/socket.h> 106 #include <sys/ioctl.h> 107 #include <sys/kernel.h> 108 #include <sys/systm.h> 109 #include <sys/time.h> 110 #include <sys/malloc.h> 111 112 #include <net/if.h> 113 #include <net/if_types.h> 114 #include <net/netisr.h> 115 #include <net/route.h> 116 #ifdef PPP_FILTER 117 #include <net/bpf.h> 118 #endif 119 120 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 121 #include <machine/intr.h> 122 #endif 123 124 #include <netinet/in.h> 125 #include <netinet/in_systm.h> 126 #include <netinet/in_var.h> 127 #ifdef INET 128 #include <netinet/ip.h> 129 #endif 130 131 #include "bpfilter.h" 132 #if NBPFILTER > 0 133 #include <sys/time.h> 134 #include <net/bpf.h> 135 #endif 136 137 #if defined(PPP_FILTER) || NBPFILTER > 0 138 #include <net/slip.h> 139 #endif 140 141 #ifdef VJC 142 #include <net/slcompress.h> 143 #endif 144 145 #include <net/ppp_defs.h> 146 #include <net/if_ppp.h> 147 #include <net/if_pppvar.h> 148 #include <machine/cpu.h> 149 150 #ifdef PPP_COMPRESS 151 #define PACKETPTR struct mbuf * 152 #include <net/ppp-comp.h> 153 #endif 154 155 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 156 static void ppp_requeue __P((struct ppp_softc *)); 157 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 158 static void ppp_ccp_closed __P((struct ppp_softc *)); 159 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 160 static void pppdumpm __P((struct mbuf *m0)); 161 162 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 163 void pppnetisr(void); 164 #endif 165 void pppintr(void *); 166 167 /* 168 * Some useful mbuf macros not in mbuf.h. 169 */ 170 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 171 172 #define M_DATASTART(m) \ 173 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 174 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 175 176 #define M_DATASIZE(m) \ 177 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 178 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 179 180 /* 181 * We define two link layer specific mbuf flags, to mark high-priority 182 * packets for output, and received packets following lost/corrupted 183 * packets. 184 */ 185 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 186 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 187 188 #ifdef PPP_COMPRESS 189 /* 190 * List of compressors we know about. 191 * We leave some space so maybe we can modload compressors. 192 */ 193 194 extern struct compressor ppp_bsd_compress; 195 extern struct compressor ppp_deflate, ppp_deflate_draft; 196 197 struct compressor *ppp_compressors[8] = { 198 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 199 &ppp_bsd_compress, 200 #endif 201 #if DO_DEFLATE && defined(PPP_DEFLATE) 202 &ppp_deflate, 203 &ppp_deflate_draft, 204 #endif 205 NULL 206 }; 207 #endif /* PPP_COMPRESS */ 208 209 210 /* 211 * Called from boot code to establish ppp interfaces. 212 */ 213 void 214 pppattach() 215 { 216 struct ppp_softc *sc; 217 int i = 0; 218 219 for (sc = ppp_softc; i < NPPP; sc++) { 220 sc->sc_unit = i; /* XXX */ 221 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 222 callout_init(&sc->sc_timo_ch); 223 sc->sc_if.if_softc = sc; 224 sc->sc_if.if_mtu = PPP_MTU; 225 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 226 sc->sc_if.if_type = IFT_PPP; 227 sc->sc_if.if_hdrlen = PPP_HDRLEN; 228 sc->sc_if.if_dlt = DLT_NULL; 229 sc->sc_if.if_ioctl = pppsioctl; 230 sc->sc_if.if_output = pppoutput; 231 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 232 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 233 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 234 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 235 IFQ_SET_READY(&sc->sc_if.if_snd); 236 if_attach(&sc->sc_if); 237 if_alloc_sadl(&sc->sc_if); 238 #if NBPFILTER > 0 239 bpfattach(&sc->sc_if, DLT_NULL, 0); 240 #endif 241 } 242 } 243 244 /* 245 * Allocate a ppp interface unit and initialize it. 246 */ 247 struct ppp_softc * 248 pppalloc(pid) 249 pid_t pid; 250 { 251 int nppp, i; 252 struct ppp_softc *sc; 253 254 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 255 if (sc->sc_xfer == pid) { 256 sc->sc_xfer = 0; 257 return sc; 258 } 259 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 260 if (sc->sc_devp == NULL) 261 break; 262 if (nppp >= NPPP) 263 return NULL; 264 265 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 266 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 267 if (sc->sc_si == NULL) { 268 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 269 return (NULL); 270 } 271 #endif 272 273 sc->sc_flags = 0; 274 sc->sc_mru = PPP_MRU; 275 sc->sc_relinq = NULL; 276 memset((char *)&sc->sc_stats, 0, sizeof(sc->sc_stats)); 277 #ifdef VJC 278 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 279 M_DEVBUF, M_NOWAIT); 280 if (sc->sc_comp) 281 sl_compress_init(sc->sc_comp); 282 #endif 283 #ifdef PPP_COMPRESS 284 sc->sc_xc_state = NULL; 285 sc->sc_rc_state = NULL; 286 #endif /* PPP_COMPRESS */ 287 for (i = 0; i < NUM_NP; ++i) 288 sc->sc_npmode[i] = NPMODE_ERROR; 289 sc->sc_npqueue = NULL; 290 sc->sc_npqtail = &sc->sc_npqueue; 291 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 292 293 return sc; 294 } 295 296 /* 297 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 298 */ 299 void 300 pppdealloc(sc) 301 struct ppp_softc *sc; 302 { 303 struct mbuf *m; 304 305 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 306 softintr_disestablish(sc->sc_si); 307 #endif 308 if_down(&sc->sc_if); 309 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 310 sc->sc_devp = NULL; 311 sc->sc_xfer = 0; 312 for (;;) { 313 IF_DEQUEUE(&sc->sc_rawq, m); 314 if (m == NULL) 315 break; 316 m_freem(m); 317 } 318 for (;;) { 319 IF_DEQUEUE(&sc->sc_inq, m); 320 if (m == NULL) 321 break; 322 m_freem(m); 323 } 324 for (;;) { 325 IF_DEQUEUE(&sc->sc_fastq, m); 326 if (m == NULL) 327 break; 328 m_freem(m); 329 } 330 while ((m = sc->sc_npqueue) != NULL) { 331 sc->sc_npqueue = m->m_nextpkt; 332 m_freem(m); 333 } 334 if (sc->sc_togo != NULL) { 335 m_freem(sc->sc_togo); 336 sc->sc_togo = NULL; 337 } 338 #ifdef PPP_COMPRESS 339 ppp_ccp_closed(sc); 340 sc->sc_xc_state = NULL; 341 sc->sc_rc_state = NULL; 342 #endif /* PPP_COMPRESS */ 343 #ifdef PPP_FILTER 344 if (sc->sc_pass_filt_in.bf_insns != 0) { 345 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 346 sc->sc_pass_filt_in.bf_insns = 0; 347 sc->sc_pass_filt_in.bf_len = 0; 348 } 349 if (sc->sc_pass_filt_out.bf_insns != 0) { 350 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 351 sc->sc_pass_filt_out.bf_insns = 0; 352 sc->sc_pass_filt_out.bf_len = 0; 353 } 354 if (sc->sc_active_filt_in.bf_insns != 0) { 355 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 356 sc->sc_active_filt_in.bf_insns = 0; 357 sc->sc_active_filt_in.bf_len = 0; 358 } 359 if (sc->sc_active_filt_out.bf_insns != 0) { 360 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 361 sc->sc_active_filt_out.bf_insns = 0; 362 sc->sc_active_filt_out.bf_len = 0; 363 } 364 #endif /* PPP_FILTER */ 365 #ifdef VJC 366 if (sc->sc_comp != 0) { 367 FREE(sc->sc_comp, M_DEVBUF); 368 sc->sc_comp = 0; 369 } 370 #endif 371 } 372 373 /* 374 * Ioctl routine for generic ppp devices. 375 */ 376 int 377 pppioctl(sc, cmd, data, flag, p) 378 struct ppp_softc *sc; 379 u_long cmd; 380 caddr_t data; 381 int flag; 382 struct proc *p; 383 { 384 int s, error, flags, mru, npx; 385 u_int nb; 386 struct ppp_option_data *odp; 387 struct compressor **cp; 388 struct npioctl *npi; 389 time_t t; 390 #ifdef PPP_FILTER 391 struct bpf_program *bp, *nbp; 392 struct bpf_insn *newcode, *oldcode; 393 int newcodelen; 394 #endif /* PPP_FILTER */ 395 #ifdef PPP_COMPRESS 396 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 397 #endif 398 399 switch (cmd) { 400 case FIONREAD: 401 *(int *)data = sc->sc_inq.ifq_len; 402 break; 403 404 case PPPIOCGUNIT: 405 *(int *)data = sc->sc_unit; /* XXX */ 406 break; 407 408 case PPPIOCGFLAGS: 409 *(u_int *)data = sc->sc_flags; 410 break; 411 412 case PPPIOCSFLAGS: 413 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 414 return (error); 415 flags = *(int *)data & SC_MASK; 416 s = splsoftnet(); 417 #ifdef PPP_COMPRESS 418 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 419 ppp_ccp_closed(sc); 420 #endif 421 splhigh(); /* XXX IMP ME HARDER */ 422 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 423 splx(s); 424 break; 425 426 case PPPIOCSMRU: 427 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 428 return (error); 429 mru = *(int *)data; 430 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 431 sc->sc_mru = mru; 432 break; 433 434 case PPPIOCGMRU: 435 *(int *)data = sc->sc_mru; 436 break; 437 438 #ifdef VJC 439 case PPPIOCSMAXCID: 440 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 441 return (error); 442 if (sc->sc_comp) { 443 s = splsoftnet(); 444 sl_compress_setup(sc->sc_comp, *(int *)data); 445 splx(s); 446 } 447 break; 448 #endif 449 450 case PPPIOCXFERUNIT: 451 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 452 return (error); 453 sc->sc_xfer = p->p_pid; 454 break; 455 456 #ifdef PPP_COMPRESS 457 case PPPIOCSCOMPRESS: 458 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 459 return (error); 460 odp = (struct ppp_option_data *) data; 461 nb = odp->length; 462 if (nb > sizeof(ccp_option)) 463 nb = sizeof(ccp_option); 464 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 465 return (error); 466 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 467 return (EINVAL); 468 for (cp = ppp_compressors; *cp != NULL; ++cp) 469 if ((*cp)->compress_proto == ccp_option[0]) { 470 /* 471 * Found a handler for the protocol - try to allocate 472 * a compressor or decompressor. 473 */ 474 error = 0; 475 if (odp->transmit) { 476 s = splsoftnet(); 477 if (sc->sc_xc_state != NULL) 478 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 479 sc->sc_xcomp = *cp; 480 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 481 if (sc->sc_xc_state == NULL) { 482 if (sc->sc_flags & SC_DEBUG) 483 printf("%s: comp_alloc failed\n", 484 sc->sc_if.if_xname); 485 error = ENOBUFS; 486 } 487 splhigh(); /* XXX IMP ME HARDER */ 488 sc->sc_flags &= ~SC_COMP_RUN; 489 splx(s); 490 } else { 491 s = splsoftnet(); 492 if (sc->sc_rc_state != NULL) 493 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 494 sc->sc_rcomp = *cp; 495 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 496 if (sc->sc_rc_state == NULL) { 497 if (sc->sc_flags & SC_DEBUG) 498 printf("%s: decomp_alloc failed\n", 499 sc->sc_if.if_xname); 500 error = ENOBUFS; 501 } 502 splhigh(); /* XXX IMP ME HARDER */ 503 sc->sc_flags &= ~SC_DECOMP_RUN; 504 splx(s); 505 } 506 return (error); 507 } 508 if (sc->sc_flags & SC_DEBUG) 509 printf("%s: no compressor for [%x %x %x], %x\n", 510 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 511 ccp_option[2], nb); 512 return (EINVAL); /* no handler found */ 513 #endif /* PPP_COMPRESS */ 514 515 case PPPIOCGNPMODE: 516 case PPPIOCSNPMODE: 517 npi = (struct npioctl *) data; 518 switch (npi->protocol) { 519 case PPP_IP: 520 npx = NP_IP; 521 break; 522 case PPP_IPV6: 523 npx = NP_IPV6; 524 break; 525 default: 526 return EINVAL; 527 } 528 if (cmd == PPPIOCGNPMODE) { 529 npi->mode = sc->sc_npmode[npx]; 530 } else { 531 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 532 return (error); 533 if (npi->mode != sc->sc_npmode[npx]) { 534 s = splnet(); 535 sc->sc_npmode[npx] = npi->mode; 536 if (npi->mode != NPMODE_QUEUE) { 537 ppp_requeue(sc); 538 ppp_restart(sc); 539 } 540 splx(s); 541 } 542 } 543 break; 544 545 case PPPIOCGIDLE: 546 s = splsoftnet(); 547 t = time.tv_sec; 548 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 549 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 550 splx(s); 551 break; 552 553 #ifdef PPP_FILTER 554 case PPPIOCSPASS: 555 case PPPIOCSACTIVE: 556 /* These are no longer supported. */ 557 return EOPNOTSUPP; 558 559 case PPPIOCSIPASS: 560 case PPPIOCSOPASS: 561 case PPPIOCSIACTIVE: 562 case PPPIOCSOACTIVE: 563 nbp = (struct bpf_program *) data; 564 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 565 return EINVAL; 566 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 567 if (newcodelen != 0) { 568 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 569 /* WAITOK -- malloc() never fails. */ 570 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 571 newcodelen)) != 0) { 572 free(newcode, M_DEVBUF); 573 return error; 574 } 575 if (!bpf_validate(newcode, nbp->bf_len)) { 576 free(newcode, M_DEVBUF); 577 return EINVAL; 578 } 579 } else 580 newcode = 0; 581 switch (cmd) { 582 case PPPIOCSIPASS: 583 bp = &sc->sc_pass_filt_in; 584 break; 585 586 case PPPIOCSOPASS: 587 bp = &sc->sc_pass_filt_out; 588 break; 589 590 case PPPIOCSIACTIVE: 591 bp = &sc->sc_active_filt_in; 592 break; 593 594 case PPPIOCSOACTIVE: 595 bp = &sc->sc_active_filt_out; 596 break; 597 } 598 oldcode = bp->bf_insns; 599 s = splnet(); 600 bp->bf_len = nbp->bf_len; 601 bp->bf_insns = newcode; 602 splx(s); 603 if (oldcode != 0) 604 free(oldcode, M_DEVBUF); 605 break; 606 #endif /* PPP_FILTER */ 607 608 default: 609 return (-1); 610 } 611 return (0); 612 } 613 614 /* 615 * Process an ioctl request to the ppp network interface. 616 */ 617 static int 618 pppsioctl(ifp, cmd, data) 619 struct ifnet *ifp; 620 u_long cmd; 621 caddr_t data; 622 { 623 struct proc *p = curproc; /* XXX */ 624 struct ppp_softc *sc = ifp->if_softc; 625 struct ifaddr *ifa = (struct ifaddr *)data; 626 struct ifreq *ifr = (struct ifreq *)data; 627 struct ppp_stats *psp; 628 #ifdef PPP_COMPRESS 629 struct ppp_comp_stats *pcp; 630 #endif 631 int s = splnet(), error = 0; 632 633 switch (cmd) { 634 case SIOCSIFFLAGS: 635 if ((ifp->if_flags & IFF_RUNNING) == 0) 636 ifp->if_flags &= ~IFF_UP; 637 break; 638 639 case SIOCSIFADDR: 640 switch (ifa->ifa_addr->sa_family) { 641 #ifdef INET 642 case AF_INET: 643 break; 644 #endif 645 #ifdef INET6 646 case AF_INET6: 647 break; 648 #endif 649 default: 650 error = EAFNOSUPPORT; 651 break; 652 } 653 break; 654 655 case SIOCSIFDSTADDR: 656 switch (ifa->ifa_addr->sa_family) { 657 #ifdef INET 658 case AF_INET: 659 break; 660 #endif 661 #ifdef INET6 662 case AF_INET6: 663 break; 664 #endif 665 default: 666 error = EAFNOSUPPORT; 667 break; 668 } 669 break; 670 671 case SIOCSIFMTU: 672 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 673 break; 674 sc->sc_if.if_mtu = ifr->ifr_mtu; 675 break; 676 677 case SIOCGIFMTU: 678 ifr->ifr_mtu = sc->sc_if.if_mtu; 679 break; 680 681 case SIOCADDMULTI: 682 case SIOCDELMULTI: 683 if (ifr == 0) { 684 error = EAFNOSUPPORT; 685 break; 686 } 687 switch(ifr->ifr_addr.sa_family) { 688 #ifdef INET 689 case AF_INET: 690 break; 691 #endif 692 #ifdef INET6 693 case AF_INET6: 694 break; 695 #endif 696 default: 697 error = EAFNOSUPPORT; 698 break; 699 } 700 break; 701 702 case SIOCGPPPSTATS: 703 psp = &((struct ifpppstatsreq *) data)->stats; 704 memset(psp, 0, sizeof(*psp)); 705 psp->p = sc->sc_stats; 706 #if defined(VJC) && !defined(SL_NO_STATS) 707 if (sc->sc_comp) { 708 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 709 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 710 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 711 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 712 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 713 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 714 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 715 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 716 } 717 #endif /* VJC */ 718 break; 719 720 #ifdef PPP_COMPRESS 721 case SIOCGPPPCSTATS: 722 pcp = &((struct ifpppcstatsreq *) data)->stats; 723 memset(pcp, 0, sizeof(*pcp)); 724 if (sc->sc_xc_state != NULL) 725 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 726 if (sc->sc_rc_state != NULL) 727 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 728 break; 729 #endif /* PPP_COMPRESS */ 730 731 default: 732 error = EINVAL; 733 } 734 splx(s); 735 return (error); 736 } 737 738 /* 739 * Queue a packet. Start transmission if not active. 740 * Packet is placed in Information field of PPP frame. 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 struct ppp_softc *sc = ifp->if_softc; 750 int protocol, address, control; 751 u_char *cp; 752 int s, error; 753 #ifdef INET 754 struct ip *ip; 755 #endif 756 struct ifqueue *ifq; 757 enum NPmode mode; 758 int len; 759 struct mbuf *m; 760 ALTQ_DECL(struct altq_pktattr pktattr;) 761 762 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 763 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 764 error = ENETDOWN; /* sort of */ 765 goto bad; 766 } 767 768 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 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 INET6 792 case AF_INET6: 793 address = PPP_ALLSTATIONS; /*XXX*/ 794 control = PPP_UI; /*XXX*/ 795 protocol = PPP_IPV6; 796 mode = sc->sc_npmode[NP_IPV6]; 797 798 #if 0 /* XXX flowinfo/traffic class, maybe? */ 799 /* 800 * If this packet has the "low delay" bit set in the IP header, 801 * put it on the fastq instead. 802 */ 803 ip = mtod(m0, struct ip *); 804 if (ip->ip_tos & IPTOS_LOWDELAY) 805 m0->m_flags |= M_HIGHPRI; 806 #endif 807 break; 808 #endif 809 case AF_UNSPEC: 810 address = PPP_ADDRESS(dst->sa_data); 811 control = PPP_CONTROL(dst->sa_data); 812 protocol = PPP_PROTOCOL(dst->sa_data); 813 mode = NPMODE_PASS; 814 break; 815 default: 816 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 817 error = EAFNOSUPPORT; 818 goto bad; 819 } 820 821 /* 822 * Drop this packet, or return an error, if necessary. 823 */ 824 if (mode == NPMODE_ERROR) { 825 error = ENETDOWN; 826 goto bad; 827 } 828 if (mode == NPMODE_DROP) { 829 error = 0; 830 goto bad; 831 } 832 833 /* 834 * Add PPP header. If no space in first mbuf, allocate another. 835 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 836 */ 837 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 838 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 839 if (m0 == 0) { 840 error = ENOBUFS; 841 goto bad; 842 } 843 m0->m_len = 0; 844 } else 845 m0->m_data -= PPP_HDRLEN; 846 847 cp = mtod(m0, u_char *); 848 *cp++ = address; 849 *cp++ = control; 850 *cp++ = protocol >> 8; 851 *cp++ = protocol & 0xff; 852 m0->m_len += PPP_HDRLEN; 853 854 len = 0; 855 for (m = m0; m != 0; m = m->m_next) 856 len += m->m_len; 857 858 if (sc->sc_flags & SC_LOG_OUTPKT) { 859 printf("%s output: ", ifp->if_xname); 860 pppdumpm(m0); 861 } 862 863 if ((protocol & 0x8000) == 0) { 864 #ifdef PPP_FILTER 865 /* 866 * Apply the pass and active filters to the packet, 867 * but only if it is a data packet. 868 */ 869 if (sc->sc_pass_filt_out.bf_insns != 0 870 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 871 len, 0) == 0) { 872 error = 0; /* drop this packet */ 873 goto bad; 874 } 875 876 /* 877 * Update the time we sent the most recent packet. 878 */ 879 if (sc->sc_active_filt_out.bf_insns == 0 880 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 881 len, 0)) 882 sc->sc_last_sent = time.tv_sec; 883 #else 884 /* 885 * Update the time we sent the most recent packet. 886 */ 887 sc->sc_last_sent = time.tv_sec; 888 #endif /* PPP_FILTER */ 889 } 890 891 #if NBPFILTER > 0 892 /* 893 * See if bpf wants to look at the packet. 894 */ 895 if (sc->sc_if.if_bpf) 896 bpf_mtap(sc->sc_if.if_bpf, m0); 897 #endif 898 899 /* 900 * Put the packet on the appropriate queue. 901 */ 902 s = splnet(); 903 if (mode == NPMODE_QUEUE) { 904 /* XXX we should limit the number of packets on this queue */ 905 *sc->sc_npqtail = m0; 906 m0->m_nextpkt = NULL; 907 sc->sc_npqtail = &m0->m_nextpkt; 908 } else { 909 if ((m0->m_flags & M_HIGHPRI) 910 #ifdef ALTQ 911 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 912 #endif 913 ) { 914 ifq = &sc->sc_fastq; 915 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 916 IF_DROP(ifq); 917 splx(s); 918 error = ENOBUFS; 919 goto bad; 920 } else { 921 IF_ENQUEUE(ifq, m0); 922 error = 0; 923 } 924 } else 925 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 926 if (error) { 927 splx(s); 928 sc->sc_if.if_oerrors++; 929 sc->sc_stats.ppp_oerrors++; 930 return (error); 931 } 932 ppp_restart(sc); 933 } 934 ifp->if_opackets++; 935 ifp->if_obytes += len; 936 937 splx(s); 938 return (0); 939 940 bad: 941 m_freem(m0); 942 return (error); 943 } 944 945 /* 946 * After a change in the NPmode for some NP, move packets from the 947 * npqueue to the send queue or the fast queue as appropriate. 948 * Should be called at splnet, since we muck with the queues. 949 */ 950 static void 951 ppp_requeue(sc) 952 struct ppp_softc *sc; 953 { 954 struct mbuf *m, **mpp; 955 struct ifqueue *ifq; 956 enum NPmode mode; 957 int error; 958 959 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 960 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 961 case PPP_IP: 962 mode = sc->sc_npmode[NP_IP]; 963 break; 964 case PPP_IPV6: 965 mode = sc->sc_npmode[NP_IPV6]; 966 break; 967 default: 968 mode = NPMODE_PASS; 969 } 970 971 switch (mode) { 972 case NPMODE_PASS: 973 /* 974 * This packet can now go on one of the queues to be sent. 975 */ 976 *mpp = m->m_nextpkt; 977 m->m_nextpkt = NULL; 978 if ((m->m_flags & M_HIGHPRI) 979 #ifdef ALTQ 980 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 981 #endif 982 ) { 983 ifq = &sc->sc_fastq; 984 if (IF_QFULL(ifq)) { 985 IF_DROP(ifq); 986 m_freem(m); 987 error = ENOBUFS; 988 } else { 989 IF_ENQUEUE(ifq, m); 990 error = 0; 991 } 992 } else 993 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 994 if (error) { 995 sc->sc_if.if_oerrors++; 996 sc->sc_stats.ppp_oerrors++; 997 } 998 break; 999 1000 case NPMODE_DROP: 1001 case NPMODE_ERROR: 1002 *mpp = m->m_nextpkt; 1003 m_freem(m); 1004 break; 1005 1006 case NPMODE_QUEUE: 1007 mpp = &m->m_nextpkt; 1008 break; 1009 } 1010 } 1011 sc->sc_npqtail = mpp; 1012 } 1013 1014 /* 1015 * Transmitter has finished outputting some stuff; 1016 * remember to call sc->sc_start later at splsoftnet. 1017 */ 1018 void 1019 ppp_restart(sc) 1020 struct ppp_softc *sc; 1021 { 1022 int s = splhigh(); /* XXX IMP ME HARDER */ 1023 1024 sc->sc_flags &= ~SC_TBUSY; 1025 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1026 softintr_schedule(sc->sc_si); 1027 #else 1028 schednetisr(NETISR_PPP); 1029 #endif 1030 splx(s); 1031 } 1032 1033 /* 1034 * Get a packet to send. This procedure is intended to be called at 1035 * splsoftnet, since it may involve time-consuming operations such as 1036 * applying VJ compression, packet compression, address/control and/or 1037 * protocol field compression to the packet. 1038 */ 1039 struct mbuf * 1040 ppp_dequeue(sc) 1041 struct ppp_softc *sc; 1042 { 1043 struct mbuf *m, *mp; 1044 u_char *cp; 1045 int address, control, protocol; 1046 int s; 1047 1048 /* 1049 * Grab a packet to send: first try the fast queue, then the 1050 * normal queue. 1051 */ 1052 s = splnet(); 1053 IF_DEQUEUE(&sc->sc_fastq, m); 1054 if (m == NULL) 1055 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1056 splx(s); 1057 1058 if (m == NULL) 1059 return NULL; 1060 1061 ++sc->sc_stats.ppp_opackets; 1062 1063 /* 1064 * Extract the ppp header of the new packet. 1065 * The ppp header will be in one mbuf. 1066 */ 1067 cp = mtod(m, u_char *); 1068 address = PPP_ADDRESS(cp); 1069 control = PPP_CONTROL(cp); 1070 protocol = PPP_PROTOCOL(cp); 1071 1072 switch (protocol) { 1073 case PPP_IP: 1074 #ifdef VJC 1075 /* 1076 * If the packet is a TCP/IP packet, see if we can compress it. 1077 */ 1078 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1079 struct ip *ip; 1080 int type; 1081 1082 mp = m; 1083 ip = (struct ip *) (cp + PPP_HDRLEN); 1084 if (mp->m_len <= PPP_HDRLEN) { 1085 mp = mp->m_next; 1086 if (mp == NULL) 1087 break; 1088 ip = mtod(mp, struct ip *); 1089 } 1090 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1091 if (ip->ip_p == IPPROTO_TCP) { 1092 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1093 !(sc->sc_flags & SC_NO_TCP_CCID)); 1094 switch (type) { 1095 case TYPE_UNCOMPRESSED_TCP: 1096 protocol = PPP_VJC_UNCOMP; 1097 break; 1098 case TYPE_COMPRESSED_TCP: 1099 protocol = PPP_VJC_COMP; 1100 cp = mtod(m, u_char *); 1101 cp[0] = address; /* header has moved */ 1102 cp[1] = control; 1103 cp[2] = 0; 1104 break; 1105 } 1106 cp[3] = protocol; /* update protocol in PPP header */ 1107 } 1108 } 1109 #endif /* VJC */ 1110 break; 1111 1112 #ifdef PPP_COMPRESS 1113 case PPP_CCP: 1114 ppp_ccp(sc, m, 0); 1115 break; 1116 #endif /* PPP_COMPRESS */ 1117 } 1118 1119 #ifdef PPP_COMPRESS 1120 if (protocol != PPP_LCP && protocol != PPP_CCP 1121 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1122 struct mbuf *mcomp = NULL; 1123 int slen, clen; 1124 1125 slen = 0; 1126 for (mp = m; mp != NULL; mp = mp->m_next) 1127 slen += mp->m_len; 1128 clen = (*sc->sc_xcomp->compress) 1129 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1130 if (mcomp != NULL) { 1131 if (sc->sc_flags & SC_CCP_UP) { 1132 /* Send the compressed packet instead of the original. */ 1133 m_freem(m); 1134 m = mcomp; 1135 cp = mtod(m, u_char *); 1136 protocol = cp[3]; 1137 } else { 1138 /* Can't transmit compressed packets until CCP is up. */ 1139 m_freem(mcomp); 1140 } 1141 } 1142 } 1143 #endif /* PPP_COMPRESS */ 1144 1145 /* 1146 * Compress the address/control and protocol, if possible. 1147 */ 1148 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1149 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1150 protocol != PPP_LCP) { 1151 /* can compress address/control */ 1152 m->m_data += 2; 1153 m->m_len -= 2; 1154 } 1155 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1156 /* can compress protocol */ 1157 if (mtod(m, u_char *) == cp) { 1158 cp[2] = cp[1]; /* move address/control up */ 1159 cp[1] = cp[0]; 1160 } 1161 ++m->m_data; 1162 --m->m_len; 1163 } 1164 1165 return m; 1166 } 1167 1168 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1169 void 1170 pppnetisr(void) 1171 { 1172 struct ppp_softc *sc; 1173 int i; 1174 1175 for (i = 0; i < NPPP; i++) { 1176 sc = &ppp_softc[i]; 1177 pppintr(sc); 1178 } 1179 } 1180 #endif 1181 1182 /* 1183 * Software interrupt routine, called at splsoftnet. 1184 */ 1185 void 1186 pppintr(void *arg) 1187 { 1188 struct ppp_softc *sc = arg; 1189 struct mbuf *m; 1190 int s; 1191 1192 if (!(sc->sc_flags & SC_TBUSY) 1193 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1194 || sc->sc_outm)) { 1195 s = splhigh(); /* XXX IMP ME HARDER */ 1196 sc->sc_flags |= SC_TBUSY; 1197 splx(s); 1198 (*sc->sc_start)(sc); 1199 } 1200 for (;;) { 1201 s = splnet(); 1202 IF_DEQUEUE(&sc->sc_rawq, m); 1203 splx(s); 1204 if (m == NULL) 1205 break; 1206 ppp_inproc(sc, m); 1207 } 1208 } 1209 1210 #ifdef PPP_COMPRESS 1211 /* 1212 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1213 * 0 if it is about to be transmitted. 1214 */ 1215 static void 1216 ppp_ccp(sc, m, rcvd) 1217 struct ppp_softc *sc; 1218 struct mbuf *m; 1219 int rcvd; 1220 { 1221 u_char *dp, *ep; 1222 struct mbuf *mp; 1223 int slen, s; 1224 1225 /* 1226 * Get a pointer to the data after the PPP header. 1227 */ 1228 if (m->m_len <= PPP_HDRLEN) { 1229 mp = m->m_next; 1230 if (mp == NULL) 1231 return; 1232 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1233 } else { 1234 mp = m; 1235 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1236 } 1237 1238 ep = mtod(mp, u_char *) + mp->m_len; 1239 if (dp + CCP_HDRLEN > ep) 1240 return; 1241 slen = CCP_LENGTH(dp); 1242 if (dp + slen > ep) { 1243 if (sc->sc_flags & SC_DEBUG) 1244 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1245 dp, slen, mtod(mp, u_char *), mp->m_len); 1246 return; 1247 } 1248 1249 switch (CCP_CODE(dp)) { 1250 case CCP_CONFREQ: 1251 case CCP_TERMREQ: 1252 case CCP_TERMACK: 1253 /* CCP must be going down - disable compression */ 1254 if (sc->sc_flags & SC_CCP_UP) { 1255 s = splhigh(); /* XXX IMP ME HARDER */ 1256 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1257 splx(s); 1258 } 1259 break; 1260 1261 case CCP_CONFACK: 1262 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1263 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1264 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1265 if (!rcvd) { 1266 /* we're agreeing to send compressed packets. */ 1267 if (sc->sc_xc_state != NULL 1268 && (*sc->sc_xcomp->comp_init) 1269 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1270 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1271 s = splhigh(); /* XXX IMP ME HARDER */ 1272 sc->sc_flags |= SC_COMP_RUN; 1273 splx(s); 1274 } 1275 } else { 1276 /* peer is agreeing to send compressed packets. */ 1277 if (sc->sc_rc_state != NULL 1278 && (*sc->sc_rcomp->decomp_init) 1279 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1280 sc->sc_unit, 0, sc->sc_mru, 1281 sc->sc_flags & SC_DEBUG)) { 1282 s = splhigh(); /* XXX IMP ME HARDER */ 1283 sc->sc_flags |= SC_DECOMP_RUN; 1284 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1285 splx(s); 1286 } 1287 } 1288 } 1289 break; 1290 1291 case CCP_RESETACK: 1292 if (sc->sc_flags & SC_CCP_UP) { 1293 if (!rcvd) { 1294 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1295 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1296 } else { 1297 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1298 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1299 s = splhigh(); /* XXX IMP ME HARDER */ 1300 sc->sc_flags &= ~SC_DC_ERROR; 1301 splx(s); 1302 } 1303 } 1304 } 1305 break; 1306 } 1307 } 1308 1309 /* 1310 * CCP is down; free (de)compressor state if necessary. 1311 */ 1312 static void 1313 ppp_ccp_closed(sc) 1314 struct ppp_softc *sc; 1315 { 1316 if (sc->sc_xc_state) { 1317 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1318 sc->sc_xc_state = NULL; 1319 } 1320 if (sc->sc_rc_state) { 1321 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1322 sc->sc_rc_state = NULL; 1323 } 1324 } 1325 #endif /* PPP_COMPRESS */ 1326 1327 /* 1328 * PPP packet input routine. 1329 * The caller has checked and removed the FCS and has inserted 1330 * the address/control bytes and the protocol high byte if they 1331 * were omitted. 1332 */ 1333 void 1334 ppppktin(sc, m, lost) 1335 struct ppp_softc *sc; 1336 struct mbuf *m; 1337 int lost; 1338 { 1339 int s = splhigh(); /* XXX IMP ME HARDER */ 1340 1341 if (lost) 1342 m->m_flags |= M_ERRMARK; 1343 IF_ENQUEUE(&sc->sc_rawq, m); 1344 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1345 softintr_schedule(sc->sc_si); 1346 #else 1347 schednetisr(NETISR_PPP); 1348 #endif 1349 splx(s); 1350 } 1351 1352 /* 1353 * Process a received PPP packet, doing decompression as necessary. 1354 * Should be called at splsoftnet. 1355 */ 1356 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1357 TYPE_UNCOMPRESSED_TCP) 1358 1359 static void 1360 ppp_inproc(sc, m) 1361 struct ppp_softc *sc; 1362 struct mbuf *m; 1363 { 1364 struct ifnet *ifp = &sc->sc_if; 1365 struct ifqueue *inq; 1366 int s, ilen, proto, rv; 1367 u_char *cp, adrs, ctrl; 1368 struct mbuf *mp, *dmp = NULL; 1369 #ifdef VJC 1370 int xlen; 1371 u_char *iphdr; 1372 u_int hlen; 1373 #endif 1374 1375 sc->sc_stats.ppp_ipackets++; 1376 1377 if (sc->sc_flags & SC_LOG_INPKT) { 1378 ilen = 0; 1379 for (mp = m; mp != NULL; mp = mp->m_next) 1380 ilen += mp->m_len; 1381 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1382 pppdumpm(m); 1383 } 1384 1385 cp = mtod(m, u_char *); 1386 adrs = PPP_ADDRESS(cp); 1387 ctrl = PPP_CONTROL(cp); 1388 proto = PPP_PROTOCOL(cp); 1389 1390 if (m->m_flags & M_ERRMARK) { 1391 m->m_flags &= ~M_ERRMARK; 1392 s = splhigh(); /* XXX IMP ME HARDER */ 1393 sc->sc_flags |= SC_VJ_RESET; 1394 splx(s); 1395 } 1396 1397 #ifdef PPP_COMPRESS 1398 /* 1399 * Decompress this packet if necessary, update the receiver's 1400 * dictionary, or take appropriate action on a CCP packet. 1401 */ 1402 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1403 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1404 /* decompress this packet */ 1405 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1406 if (rv == DECOMP_OK) { 1407 m_freem(m); 1408 if (dmp == NULL) { 1409 /* no error, but no decompressed packet produced */ 1410 return; 1411 } 1412 m = dmp; 1413 cp = mtod(m, u_char *); 1414 proto = PPP_PROTOCOL(cp); 1415 1416 } else { 1417 /* 1418 * An error has occurred in decompression. 1419 * Pass the compressed packet up to pppd, which may take 1420 * CCP down or issue a Reset-Req. 1421 */ 1422 if (sc->sc_flags & SC_DEBUG) 1423 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1424 s = splhigh(); /* XXX IMP ME HARDER */ 1425 sc->sc_flags |= SC_VJ_RESET; 1426 if (rv == DECOMP_ERROR) 1427 sc->sc_flags |= SC_DC_ERROR; 1428 else 1429 sc->sc_flags |= SC_DC_FERROR; 1430 splx(s); 1431 } 1432 1433 } else { 1434 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1435 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1436 } 1437 if (proto == PPP_CCP) { 1438 ppp_ccp(sc, m, 1); 1439 } 1440 } 1441 #endif 1442 1443 ilen = 0; 1444 for (mp = m; mp != NULL; mp = mp->m_next) 1445 ilen += mp->m_len; 1446 1447 #ifdef VJC 1448 if (sc->sc_flags & SC_VJ_RESET) { 1449 /* 1450 * If we've missed a packet, we must toss subsequent compressed 1451 * packets which don't have an explicit connection ID. 1452 */ 1453 if (sc->sc_comp) 1454 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1455 s = splhigh(); /* XXX IMP ME HARDER */ 1456 sc->sc_flags &= ~SC_VJ_RESET; 1457 splx(s); 1458 } 1459 1460 /* 1461 * See if we have a VJ-compressed packet to uncompress. 1462 */ 1463 if (proto == PPP_VJC_COMP) { 1464 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1465 goto bad; 1466 1467 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1468 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1469 sc->sc_comp, &iphdr, &hlen); 1470 1471 if (xlen <= 0) { 1472 if (sc->sc_flags & SC_DEBUG) 1473 printf("%s: VJ uncompress failed on type comp\n", 1474 ifp->if_xname); 1475 goto bad; 1476 } 1477 1478 /* Copy the PPP and IP headers into a new mbuf. */ 1479 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1480 if (mp == NULL) 1481 goto bad; 1482 mp->m_len = 0; 1483 mp->m_next = NULL; 1484 if (hlen + PPP_HDRLEN > MHLEN) { 1485 MCLGET(mp, M_DONTWAIT); 1486 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1487 m_freem(mp); 1488 goto bad; /* lose if big headers and no clusters */ 1489 } 1490 } 1491 cp = mtod(mp, u_char *); 1492 cp[0] = adrs; 1493 cp[1] = ctrl; 1494 cp[2] = 0; 1495 cp[3] = PPP_IP; 1496 proto = PPP_IP; 1497 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1498 mp->m_len = hlen + PPP_HDRLEN; 1499 1500 /* 1501 * Trim the PPP and VJ headers off the old mbuf 1502 * and stick the new and old mbufs together. 1503 */ 1504 m->m_data += PPP_HDRLEN + xlen; 1505 m->m_len -= PPP_HDRLEN + xlen; 1506 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1507 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1508 mp->m_len += m->m_len; 1509 MFREE(m, mp->m_next); 1510 } else 1511 mp->m_next = m; 1512 m = mp; 1513 ilen += hlen - xlen; 1514 1515 } else if (proto == PPP_VJC_UNCOMP) { 1516 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1517 goto bad; 1518 1519 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1520 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1521 sc->sc_comp, &iphdr, &hlen); 1522 1523 if (xlen < 0) { 1524 if (sc->sc_flags & SC_DEBUG) 1525 printf("%s: VJ uncompress failed on type uncomp\n", 1526 ifp->if_xname); 1527 goto bad; 1528 } 1529 1530 proto = PPP_IP; 1531 cp[3] = PPP_IP; 1532 } 1533 #endif /* VJC */ 1534 1535 /* 1536 * If the packet will fit in a header mbuf, don't waste a 1537 * whole cluster on it. 1538 */ 1539 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1540 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1541 if (mp != NULL) { 1542 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1543 m_freem(m); 1544 m = mp; 1545 m->m_len = ilen; 1546 } 1547 } 1548 m->m_pkthdr.len = ilen; 1549 m->m_pkthdr.rcvif = ifp; 1550 1551 if ((proto & 0x8000) == 0) { 1552 #ifdef PPP_FILTER 1553 /* 1554 * See whether we want to pass this packet, and 1555 * if it counts as link activity. 1556 */ 1557 if (sc->sc_pass_filt_in.bf_insns != 0 1558 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1559 ilen, 0) == 0) { 1560 /* drop this packet */ 1561 m_freem(m); 1562 return; 1563 } 1564 if (sc->sc_active_filt_in.bf_insns == 0 1565 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1566 ilen, 0)) 1567 sc->sc_last_recv = time.tv_sec; 1568 #else 1569 /* 1570 * Record the time that we received this packet. 1571 */ 1572 sc->sc_last_recv = time.tv_sec; 1573 #endif /* PPP_FILTER */ 1574 } 1575 1576 #if NBPFILTER > 0 1577 /* See if bpf wants to look at the packet. */ 1578 if (sc->sc_if.if_bpf) 1579 bpf_mtap(sc->sc_if.if_bpf, m); 1580 #endif 1581 1582 rv = 0; 1583 switch (proto) { 1584 #ifdef INET 1585 case PPP_IP: 1586 /* 1587 * IP packet - take off the ppp header and pass it up to IP. 1588 */ 1589 if ((ifp->if_flags & IFF_UP) == 0 1590 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1591 /* interface is down - drop the packet. */ 1592 m_freem(m); 1593 return; 1594 } 1595 m->m_pkthdr.len -= PPP_HDRLEN; 1596 m->m_data += PPP_HDRLEN; 1597 m->m_len -= PPP_HDRLEN; 1598 #ifdef GATEWAY 1599 if (ipflow_fastforward(m)) 1600 return; 1601 #endif 1602 schednetisr(NETISR_IP); 1603 inq = &ipintrq; 1604 break; 1605 #endif 1606 1607 #ifdef INET6 1608 case PPP_IPV6: 1609 /* 1610 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1611 */ 1612 if ((ifp->if_flags & IFF_UP) == 0 1613 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1614 /* interface is down - drop the packet. */ 1615 m_freem(m); 1616 return; 1617 } 1618 m->m_pkthdr.len -= PPP_HDRLEN; 1619 m->m_data += PPP_HDRLEN; 1620 m->m_len -= PPP_HDRLEN; 1621 schednetisr(NETISR_IPV6); 1622 inq = &ip6intrq; 1623 break; 1624 #endif 1625 1626 default: 1627 /* 1628 * Some other protocol - place on input queue for read(). 1629 */ 1630 inq = &sc->sc_inq; 1631 rv = 1; 1632 break; 1633 } 1634 1635 /* 1636 * Put the packet on the appropriate input queue. 1637 */ 1638 s = splnet(); 1639 if (IF_QFULL(inq)) { 1640 IF_DROP(inq); 1641 splx(s); 1642 if (sc->sc_flags & SC_DEBUG) 1643 printf("%s: input queue full\n", ifp->if_xname); 1644 ifp->if_iqdrops++; 1645 goto bad; 1646 } 1647 IF_ENQUEUE(inq, m); 1648 splx(s); 1649 ifp->if_ipackets++; 1650 ifp->if_ibytes += ilen; 1651 1652 if (rv) 1653 (*sc->sc_ctlp)(sc); 1654 1655 return; 1656 1657 bad: 1658 m_freem(m); 1659 sc->sc_if.if_ierrors++; 1660 sc->sc_stats.ppp_ierrors++; 1661 } 1662 1663 #define MAX_DUMP_BYTES 128 1664 1665 static void 1666 pppdumpm(m0) 1667 struct mbuf *m0; 1668 { 1669 char buf[3*MAX_DUMP_BYTES+4]; 1670 char *bp = buf; 1671 struct mbuf *m; 1672 static char digits[] = "0123456789abcdef"; 1673 1674 for (m = m0; m; m = m->m_next) { 1675 int l = m->m_len; 1676 u_char *rptr = (u_char *)m->m_data; 1677 1678 while (l--) { 1679 if (bp > buf + sizeof(buf) - 4) 1680 goto done; 1681 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1682 *bp++ = digits[*rptr++ & 0xf]; 1683 } 1684 1685 if (m->m_next) { 1686 if (bp > buf + sizeof(buf) - 3) 1687 goto done; 1688 *bp++ = '|'; 1689 } else 1690 *bp++ = ' '; 1691 } 1692 done: 1693 if (m) 1694 *bp++ = '>'; 1695 *bp = 0; 1696 printf("%s\n", buf); 1697 } 1698
Indexes created Fri Oct 03 02:09:57 GMT 2025