if_ppp.c revision 1.67.2.4
1 /* $NetBSD: if_ppp.c,v 1.67.2.4 2001/11/14 19:17:23 nathanw 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 1.67.2.4 2001/11/14 19:17:23 nathanw 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/lwp.h> 104 #include <sys/proc.h> 105 #include <sys/mbuf.h> 106 #include <sys/socket.h> 107 #include <sys/ioctl.h> 108 #include <sys/kernel.h> 109 #include <sys/systm.h> 110 #include <sys/time.h> 111 #include <sys/malloc.h> 112 113 #include <net/if.h> 114 #include <net/if_types.h> 115 #include <net/netisr.h> 116 #include <net/route.h> 117 #ifdef PPP_FILTER 118 #include <net/bpf.h> 119 #endif 120 121 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 122 #include <machine/intr.h> 123 #endif 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/in_var.h> 128 #ifdef INET 129 #include <netinet/ip.h> 130 #endif 131 132 #include "bpfilter.h" 133 #if NBPFILTER > 0 134 #include <sys/time.h> 135 #include <net/bpf.h> 136 #endif 137 138 #if defined(PPP_FILTER) || NBPFILTER > 0 139 #include <net/slip.h> 140 #endif 141 142 #ifdef VJC 143 #include <net/slcompress.h> 144 #endif 145 146 #include <net/ppp_defs.h> 147 #include <net/if_ppp.h> 148 #include <net/if_pppvar.h> 149 #include <machine/cpu.h> 150 151 #ifdef PPP_COMPRESS 152 #define PACKETPTR struct mbuf * 153 #include <net/ppp-comp.h> 154 #endif 155 156 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 157 static void ppp_requeue __P((struct ppp_softc *)); 158 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 159 static void ppp_ccp_closed __P((struct ppp_softc *)); 160 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 161 static void pppdumpm __P((struct mbuf *m0)); 162 163 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 164 void pppnetisr(void); 165 #endif 166 void pppintr(void *); 167 168 /* 169 * Some useful mbuf macros not in mbuf.h. 170 */ 171 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 172 173 #define M_DATASTART(m) \ 174 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 175 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 176 177 #define M_DATASIZE(m) \ 178 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 179 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 180 181 /* 182 * We define two link layer specific mbuf flags, to mark high-priority 183 * packets for output, and received packets following lost/corrupted 184 * packets. 185 */ 186 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 187 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 188 189 #ifdef PPP_COMPRESS 190 /* 191 * List of compressors we know about. 192 * We leave some space so maybe we can modload compressors. 193 */ 194 195 extern struct compressor ppp_bsd_compress; 196 extern struct compressor ppp_deflate, ppp_deflate_draft; 197 198 struct compressor *ppp_compressors[8] = { 199 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 200 &ppp_bsd_compress, 201 #endif 202 #if DO_DEFLATE && defined(PPP_DEFLATE) 203 &ppp_deflate, 204 &ppp_deflate_draft, 205 #endif 206 NULL 207 }; 208 #endif /* PPP_COMPRESS */ 209 210 211 /* 212 * Called from boot code to establish ppp interfaces. 213 */ 214 void 215 pppattach() 216 { 217 struct ppp_softc *sc; 218 int i = 0; 219 220 for (sc = ppp_softc; i < NPPP; sc++) { 221 sc->sc_unit = i; /* XXX */ 222 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 223 callout_init(&sc->sc_timo_ch); 224 sc->sc_if.if_softc = sc; 225 sc->sc_if.if_mtu = PPP_MTU; 226 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 227 sc->sc_if.if_type = IFT_PPP; 228 sc->sc_if.if_hdrlen = PPP_HDRLEN; 229 sc->sc_if.if_dlt = DLT_NULL; 230 sc->sc_if.if_ioctl = pppsioctl; 231 sc->sc_if.if_output = pppoutput; 232 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 233 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 234 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 235 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 236 IFQ_SET_READY(&sc->sc_if.if_snd); 237 if_attach(&sc->sc_if); 238 if_alloc_sadl(&sc->sc_if); 239 #if NBPFILTER > 0 240 bpfattach(&sc->sc_if, DLT_NULL, 0); 241 #endif 242 } 243 } 244 245 /* 246 * Allocate a ppp interface unit and initialize it. 247 */ 248 struct ppp_softc * 249 pppalloc(pid) 250 pid_t pid; 251 { 252 int nppp, i; 253 struct ppp_softc *sc; 254 255 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 256 if (sc->sc_xfer == pid) { 257 sc->sc_xfer = 0; 258 return sc; 259 } 260 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 261 if (sc->sc_devp == NULL) 262 break; 263 if (nppp >= NPPP) 264 return NULL; 265 266 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 267 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 268 if (sc->sc_si == NULL) { 269 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 270 return (NULL); 271 } 272 #endif 273 274 sc->sc_flags = 0; 275 sc->sc_mru = PPP_MRU; 276 sc->sc_relinq = NULL; 277 memset((char *)&sc->sc_stats, 0, sizeof(sc->sc_stats)); 278 #ifdef VJC 279 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 280 M_DEVBUF, M_NOWAIT); 281 if (sc->sc_comp) 282 sl_compress_init(sc->sc_comp); 283 #endif 284 #ifdef PPP_COMPRESS 285 sc->sc_xc_state = NULL; 286 sc->sc_rc_state = NULL; 287 #endif /* PPP_COMPRESS */ 288 for (i = 0; i < NUM_NP; ++i) 289 sc->sc_npmode[i] = NPMODE_ERROR; 290 sc->sc_npqueue = NULL; 291 sc->sc_npqtail = &sc->sc_npqueue; 292 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 293 294 return sc; 295 } 296 297 /* 298 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 299 */ 300 void 301 pppdealloc(sc) 302 struct ppp_softc *sc; 303 { 304 struct mbuf *m; 305 306 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 307 softintr_disestablish(sc->sc_si); 308 #endif 309 if_down(&sc->sc_if); 310 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 311 sc->sc_devp = NULL; 312 sc->sc_xfer = 0; 313 for (;;) { 314 IF_DEQUEUE(&sc->sc_rawq, m); 315 if (m == NULL) 316 break; 317 m_freem(m); 318 } 319 for (;;) { 320 IF_DEQUEUE(&sc->sc_inq, m); 321 if (m == NULL) 322 break; 323 m_freem(m); 324 } 325 for (;;) { 326 IF_DEQUEUE(&sc->sc_fastq, m); 327 if (m == NULL) 328 break; 329 m_freem(m); 330 } 331 while ((m = sc->sc_npqueue) != NULL) { 332 sc->sc_npqueue = m->m_nextpkt; 333 m_freem(m); 334 } 335 if (sc->sc_togo != NULL) { 336 m_freem(sc->sc_togo); 337 sc->sc_togo = NULL; 338 } 339 #ifdef PPP_COMPRESS 340 ppp_ccp_closed(sc); 341 sc->sc_xc_state = NULL; 342 sc->sc_rc_state = NULL; 343 #endif /* PPP_COMPRESS */ 344 #ifdef PPP_FILTER 345 if (sc->sc_pass_filt_in.bf_insns != 0) { 346 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 347 sc->sc_pass_filt_in.bf_insns = 0; 348 sc->sc_pass_filt_in.bf_len = 0; 349 } 350 if (sc->sc_pass_filt_out.bf_insns != 0) { 351 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 352 sc->sc_pass_filt_out.bf_insns = 0; 353 sc->sc_pass_filt_out.bf_len = 0; 354 } 355 if (sc->sc_active_filt_in.bf_insns != 0) { 356 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 357 sc->sc_active_filt_in.bf_insns = 0; 358 sc->sc_active_filt_in.bf_len = 0; 359 } 360 if (sc->sc_active_filt_out.bf_insns != 0) { 361 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 362 sc->sc_active_filt_out.bf_insns = 0; 363 sc->sc_active_filt_out.bf_len = 0; 364 } 365 #endif /* PPP_FILTER */ 366 #ifdef VJC 367 if (sc->sc_comp != 0) { 368 FREE(sc->sc_comp, M_DEVBUF); 369 sc->sc_comp = 0; 370 } 371 #endif 372 } 373 374 /* 375 * Ioctl routine for generic ppp devices. 376 */ 377 int 378 pppioctl(sc, cmd, data, flag, p) 379 struct ppp_softc *sc; 380 u_long cmd; 381 caddr_t data; 382 int flag; 383 struct proc *p; 384 { 385 int s, error, flags, mru, npx; 386 u_int nb; 387 struct ppp_option_data *odp; 388 struct compressor **cp; 389 struct npioctl *npi; 390 time_t t; 391 #ifdef PPP_FILTER 392 struct bpf_program *bp, *nbp; 393 struct bpf_insn *newcode, *oldcode; 394 int newcodelen; 395 #endif /* PPP_FILTER */ 396 #ifdef PPP_COMPRESS 397 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 398 #endif 399 400 switch (cmd) { 401 case FIONREAD: 402 *(int *)data = sc->sc_inq.ifq_len; 403 break; 404 405 case PPPIOCGUNIT: 406 *(int *)data = sc->sc_unit; /* XXX */ 407 break; 408 409 case PPPIOCGFLAGS: 410 *(u_int *)data = sc->sc_flags; 411 break; 412 413 case PPPIOCSFLAGS: 414 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 415 return (error); 416 flags = *(int *)data & SC_MASK; 417 s = splsoftnet(); 418 #ifdef PPP_COMPRESS 419 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 420 ppp_ccp_closed(sc); 421 #endif 422 splhigh(); /* XXX IMP ME HARDER */ 423 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 424 splx(s); 425 break; 426 427 case PPPIOCSMRU: 428 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 429 return (error); 430 mru = *(int *)data; 431 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 432 sc->sc_mru = mru; 433 break; 434 435 case PPPIOCGMRU: 436 *(int *)data = sc->sc_mru; 437 break; 438 439 #ifdef VJC 440 case PPPIOCSMAXCID: 441 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 442 return (error); 443 if (sc->sc_comp) { 444 s = splsoftnet(); 445 sl_compress_setup(sc->sc_comp, *(int *)data); 446 splx(s); 447 } 448 break; 449 #endif 450 451 case PPPIOCXFERUNIT: 452 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 453 return (error); 454 sc->sc_xfer = p->p_pid; 455 break; 456 457 #ifdef PPP_COMPRESS 458 case PPPIOCSCOMPRESS: 459 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 460 return (error); 461 odp = (struct ppp_option_data *) data; 462 nb = odp->length; 463 if (nb > sizeof(ccp_option)) 464 nb = sizeof(ccp_option); 465 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 466 return (error); 467 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 468 return (EINVAL); 469 for (cp = ppp_compressors; *cp != NULL; ++cp) 470 if ((*cp)->compress_proto == ccp_option[0]) { 471 /* 472 * Found a handler for the protocol - try to allocate 473 * a compressor or decompressor. 474 */ 475 error = 0; 476 if (odp->transmit) { 477 s = splsoftnet(); 478 if (sc->sc_xc_state != NULL) 479 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 480 sc->sc_xcomp = *cp; 481 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 482 if (sc->sc_xc_state == NULL) { 483 if (sc->sc_flags & SC_DEBUG) 484 printf("%s: comp_alloc failed\n", 485 sc->sc_if.if_xname); 486 error = ENOBUFS; 487 } 488 splhigh(); /* XXX IMP ME HARDER */ 489 sc->sc_flags &= ~SC_COMP_RUN; 490 splx(s); 491 } else { 492 s = splsoftnet(); 493 if (sc->sc_rc_state != NULL) 494 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 495 sc->sc_rcomp = *cp; 496 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 497 if (sc->sc_rc_state == NULL) { 498 if (sc->sc_flags & SC_DEBUG) 499 printf("%s: decomp_alloc failed\n", 500 sc->sc_if.if_xname); 501 error = ENOBUFS; 502 } 503 splhigh(); /* XXX IMP ME HARDER */ 504 sc->sc_flags &= ~SC_DECOMP_RUN; 505 splx(s); 506 } 507 return (error); 508 } 509 if (sc->sc_flags & SC_DEBUG) 510 printf("%s: no compressor for [%x %x %x], %x\n", 511 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 512 ccp_option[2], nb); 513 return (EINVAL); /* no handler found */ 514 #endif /* PPP_COMPRESS */ 515 516 case PPPIOCGNPMODE: 517 case PPPIOCSNPMODE: 518 npi = (struct npioctl *) data; 519 switch (npi->protocol) { 520 case PPP_IP: 521 npx = NP_IP; 522 break; 523 case PPP_IPV6: 524 npx = NP_IPV6; 525 break; 526 default: 527 return EINVAL; 528 } 529 if (cmd == PPPIOCGNPMODE) { 530 npi->mode = sc->sc_npmode[npx]; 531 } else { 532 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 533 return (error); 534 if (npi->mode != sc->sc_npmode[npx]) { 535 s = splnet(); 536 sc->sc_npmode[npx] = npi->mode; 537 if (npi->mode != NPMODE_QUEUE) { 538 ppp_requeue(sc); 539 ppp_restart(sc); 540 } 541 splx(s); 542 } 543 } 544 break; 545 546 case PPPIOCGIDLE: 547 s = splsoftnet(); 548 t = time.tv_sec; 549 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 550 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 551 splx(s); 552 break; 553 554 #ifdef PPP_FILTER 555 case PPPIOCSPASS: 556 case PPPIOCSACTIVE: 557 /* These are no longer supported. */ 558 return EOPNOTSUPP; 559 560 case PPPIOCSIPASS: 561 case PPPIOCSOPASS: 562 case PPPIOCSIACTIVE: 563 case PPPIOCSOACTIVE: 564 nbp = (struct bpf_program *) data; 565 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 566 return EINVAL; 567 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 568 if (newcodelen != 0) { 569 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 570 /* WAITOK -- malloc() never fails. */ 571 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 572 newcodelen)) != 0) { 573 free(newcode, M_DEVBUF); 574 return error; 575 } 576 if (!bpf_validate(newcode, nbp->bf_len)) { 577 free(newcode, M_DEVBUF); 578 return EINVAL; 579 } 580 } else 581 newcode = 0; 582 switch (cmd) { 583 case PPPIOCSIPASS: 584 bp = &sc->sc_pass_filt_in; 585 break; 586 587 case PPPIOCSOPASS: 588 bp = &sc->sc_pass_filt_out; 589 break; 590 591 case PPPIOCSIACTIVE: 592 bp = &sc->sc_active_filt_in; 593 break; 594 595 case PPPIOCSOACTIVE: 596 bp = &sc->sc_active_filt_out; 597 break; 598 } 599 oldcode = bp->bf_insns; 600 s = splnet(); 601 bp->bf_len = nbp->bf_len; 602 bp->bf_insns = newcode; 603 splx(s); 604 if (oldcode != 0) 605 free(oldcode, M_DEVBUF); 606 break; 607 #endif /* PPP_FILTER */ 608 609 default: 610 return (-1); 611 } 612 return (0); 613 } 614 615 /* 616 * Process an ioctl request to the ppp network interface. 617 */ 618 static int 619 pppsioctl(ifp, cmd, data) 620 struct ifnet *ifp; 621 u_long cmd; 622 caddr_t data; 623 { 624 struct proc *p = curproc->l_proc; /* XXX */ 625 struct ppp_softc *sc = ifp->if_softc; 626 struct ifaddr *ifa = (struct ifaddr *)data; 627 struct ifreq *ifr = (struct ifreq *)data; 628 struct ppp_stats *psp; 629 #ifdef PPP_COMPRESS 630 struct ppp_comp_stats *pcp; 631 #endif 632 int s = splnet(), error = 0; 633 634 switch (cmd) { 635 case SIOCSIFFLAGS: 636 if ((ifp->if_flags & IFF_RUNNING) == 0) 637 ifp->if_flags &= ~IFF_UP; 638 break; 639 640 case SIOCSIFADDR: 641 switch (ifa->ifa_addr->sa_family) { 642 #ifdef INET 643 case AF_INET: 644 break; 645 #endif 646 #ifdef INET6 647 case AF_INET6: 648 break; 649 #endif 650 default: 651 error = EAFNOSUPPORT; 652 break; 653 } 654 break; 655 656 case SIOCSIFDSTADDR: 657 switch (ifa->ifa_addr->sa_family) { 658 #ifdef INET 659 case AF_INET: 660 break; 661 #endif 662 #ifdef INET6 663 case AF_INET6: 664 break; 665 #endif 666 default: 667 error = EAFNOSUPPORT; 668 break; 669 } 670 break; 671 672 case SIOCSIFMTU: 673 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 674 break; 675 sc->sc_if.if_mtu = ifr->ifr_mtu; 676 break; 677 678 case SIOCGIFMTU: 679 ifr->ifr_mtu = sc->sc_if.if_mtu; 680 break; 681 682 case SIOCADDMULTI: 683 case SIOCDELMULTI: 684 if (ifr == 0) { 685 error = EAFNOSUPPORT; 686 break; 687 } 688 switch(ifr->ifr_addr.sa_family) { 689 #ifdef INET 690 case AF_INET: 691 break; 692 #endif 693 #ifdef INET6 694 case AF_INET6: 695 break; 696 #endif 697 default: 698 error = EAFNOSUPPORT; 699 break; 700 } 701 break; 702 703 case SIOCGPPPSTATS: 704 psp = &((struct ifpppstatsreq *) data)->stats; 705 memset(psp, 0, sizeof(*psp)); 706 psp->p = sc->sc_stats; 707 #if defined(VJC) && !defined(SL_NO_STATS) 708 if (sc->sc_comp) { 709 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 710 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 711 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 712 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 713 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 714 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 715 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 716 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 717 } 718 #endif /* VJC */ 719 break; 720 721 #ifdef PPP_COMPRESS 722 case SIOCGPPPCSTATS: 723 pcp = &((struct ifpppcstatsreq *) data)->stats; 724 memset(pcp, 0, sizeof(*pcp)); 725 if (sc->sc_xc_state != NULL) 726 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 727 if (sc->sc_rc_state != NULL) 728 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 729 break; 730 #endif /* PPP_COMPRESS */ 731 732 default: 733 error = EINVAL; 734 } 735 splx(s); 736 return (error); 737 } 738 739 /* 740 * Queue a packet. Start transmission if not active. 741 * Packet is placed in Information field of PPP frame. 742 */ 743 int 744 pppoutput(ifp, m0, dst, rtp) 745 struct ifnet *ifp; 746 struct mbuf *m0; 747 struct sockaddr *dst; 748 struct rtentry *rtp; 749 { 750 struct ppp_softc *sc = ifp->if_softc; 751 int protocol, address, control; 752 u_char *cp; 753 int s, error; 754 #ifdef INET 755 struct ip *ip; 756 #endif 757 struct ifqueue *ifq; 758 enum NPmode mode; 759 int len; 760 struct mbuf *m; 761 ALTQ_DECL(struct altq_pktattr pktattr;) 762 763 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 764 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 765 error = ENETDOWN; /* sort of */ 766 goto bad; 767 } 768 769 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 770 771 /* 772 * Compute PPP header. 773 */ 774 m0->m_flags &= ~M_HIGHPRI; 775 switch (dst->sa_family) { 776 #ifdef INET 777 case AF_INET: 778 address = PPP_ALLSTATIONS; 779 control = PPP_UI; 780 protocol = PPP_IP; 781 mode = sc->sc_npmode[NP_IP]; 782 783 /* 784 * If this packet has the "low delay" bit set in the IP header, 785 * put it on the fastq instead. 786 */ 787 ip = mtod(m0, struct ip *); 788 if (ip->ip_tos & IPTOS_LOWDELAY) 789 m0->m_flags |= M_HIGHPRI; 790 break; 791 #endif 792 #ifdef INET6 793 case AF_INET6: 794 address = PPP_ALLSTATIONS; /*XXX*/ 795 control = PPP_UI; /*XXX*/ 796 protocol = PPP_IPV6; 797 mode = sc->sc_npmode[NP_IPV6]; 798 799 #if 0 /* XXX flowinfo/traffic class, maybe? */ 800 /* 801 * If this packet has the "low delay" bit set in the IP header, 802 * put it on the fastq instead. 803 */ 804 ip = mtod(m0, struct ip *); 805 if (ip->ip_tos & IPTOS_LOWDELAY) 806 m0->m_flags |= M_HIGHPRI; 807 #endif 808 break; 809 #endif 810 case AF_UNSPEC: 811 address = PPP_ADDRESS(dst->sa_data); 812 control = PPP_CONTROL(dst->sa_data); 813 protocol = PPP_PROTOCOL(dst->sa_data); 814 mode = NPMODE_PASS; 815 break; 816 default: 817 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 818 error = EAFNOSUPPORT; 819 goto bad; 820 } 821 822 /* 823 * Drop this packet, or return an error, if necessary. 824 */ 825 if (mode == NPMODE_ERROR) { 826 error = ENETDOWN; 827 goto bad; 828 } 829 if (mode == NPMODE_DROP) { 830 error = 0; 831 goto bad; 832 } 833 834 /* 835 * Add PPP header. If no space in first mbuf, allocate another. 836 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 837 */ 838 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 839 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 840 if (m0 == 0) { 841 error = ENOBUFS; 842 goto bad; 843 } 844 m0->m_len = 0; 845 } else 846 m0->m_data -= PPP_HDRLEN; 847 848 cp = mtod(m0, u_char *); 849 *cp++ = address; 850 *cp++ = control; 851 *cp++ = protocol >> 8; 852 *cp++ = protocol & 0xff; 853 m0->m_len += PPP_HDRLEN; 854 855 len = 0; 856 for (m = m0; m != 0; m = m->m_next) 857 len += m->m_len; 858 859 if (sc->sc_flags & SC_LOG_OUTPKT) { 860 printf("%s output: ", ifp->if_xname); 861 pppdumpm(m0); 862 } 863 864 if ((protocol & 0x8000) == 0) { 865 #ifdef PPP_FILTER 866 /* 867 * Apply the pass and active filters to the packet, 868 * but only if it is a data packet. 869 */ 870 if (sc->sc_pass_filt_out.bf_insns != 0 871 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 872 len, 0) == 0) { 873 error = 0; /* drop this packet */ 874 goto bad; 875 } 876 877 /* 878 * Update the time we sent the most recent packet. 879 */ 880 if (sc->sc_active_filt_out.bf_insns == 0 881 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 882 len, 0)) 883 sc->sc_last_sent = time.tv_sec; 884 #else 885 /* 886 * Update the time we sent the most recent packet. 887 */ 888 sc->sc_last_sent = time.tv_sec; 889 #endif /* PPP_FILTER */ 890 } 891 892 #if NBPFILTER > 0 893 /* 894 * See if bpf wants to look at the packet. 895 */ 896 if (sc->sc_if.if_bpf) 897 bpf_mtap(sc->sc_if.if_bpf, m0); 898 #endif 899 900 /* 901 * Put the packet on the appropriate queue. 902 */ 903 s = splnet(); 904 if (mode == NPMODE_QUEUE) { 905 /* XXX we should limit the number of packets on this queue */ 906 *sc->sc_npqtail = m0; 907 m0->m_nextpkt = NULL; 908 sc->sc_npqtail = &m0->m_nextpkt; 909 } else { 910 if ((m0->m_flags & M_HIGHPRI) 911 #ifdef ALTQ 912 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 913 #endif 914 ) { 915 ifq = &sc->sc_fastq; 916 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 917 IF_DROP(ifq); 918 splx(s); 919 error = ENOBUFS; 920 goto bad; 921 } else { 922 IF_ENQUEUE(ifq, m0); 923 error = 0; 924 } 925 } else 926 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 927 if (error) { 928 splx(s); 929 sc->sc_if.if_oerrors++; 930 sc->sc_stats.ppp_oerrors++; 931 return (error); 932 } 933 ppp_restart(sc); 934 } 935 ifp->if_opackets++; 936 ifp->if_obytes += len; 937 938 splx(s); 939 return (0); 940 941 bad: 942 m_freem(m0); 943 return (error); 944 } 945 946 /* 947 * After a change in the NPmode for some NP, move packets from the 948 * npqueue to the send queue or the fast queue as appropriate. 949 * Should be called at splnet, since we muck with the queues. 950 */ 951 static void 952 ppp_requeue(sc) 953 struct ppp_softc *sc; 954 { 955 struct mbuf *m, **mpp; 956 struct ifqueue *ifq; 957 enum NPmode mode; 958 int error; 959 960 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 961 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 962 case PPP_IP: 963 mode = sc->sc_npmode[NP_IP]; 964 break; 965 case PPP_IPV6: 966 mode = sc->sc_npmode[NP_IPV6]; 967 break; 968 default: 969 mode = NPMODE_PASS; 970 } 971 972 switch (mode) { 973 case NPMODE_PASS: 974 /* 975 * This packet can now go on one of the queues to be sent. 976 */ 977 *mpp = m->m_nextpkt; 978 m->m_nextpkt = NULL; 979 if ((m->m_flags & M_HIGHPRI) 980 #ifdef ALTQ 981 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 982 #endif 983 ) { 984 ifq = &sc->sc_fastq; 985 if (IF_QFULL(ifq)) { 986 IF_DROP(ifq); 987 m_freem(m); 988 error = ENOBUFS; 989 } else { 990 IF_ENQUEUE(ifq, m); 991 error = 0; 992 } 993 } else 994 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 995 if (error) { 996 sc->sc_if.if_oerrors++; 997 sc->sc_stats.ppp_oerrors++; 998 } 999 break; 1000 1001 case NPMODE_DROP: 1002 case NPMODE_ERROR: 1003 *mpp = m->m_nextpkt; 1004 m_freem(m); 1005 break; 1006 1007 case NPMODE_QUEUE: 1008 mpp = &m->m_nextpkt; 1009 break; 1010 } 1011 } 1012 sc->sc_npqtail = mpp; 1013 } 1014 1015 /* 1016 * Transmitter has finished outputting some stuff; 1017 * remember to call sc->sc_start later at splsoftnet. 1018 */ 1019 void 1020 ppp_restart(sc) 1021 struct ppp_softc *sc; 1022 { 1023 int s = splhigh(); /* XXX IMP ME HARDER */ 1024 1025 sc->sc_flags &= ~SC_TBUSY; 1026 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1027 softintr_schedule(sc->sc_si); 1028 #else 1029 schednetisr(NETISR_PPP); 1030 #endif 1031 splx(s); 1032 } 1033 1034 /* 1035 * Get a packet to send. This procedure is intended to be called at 1036 * splsoftnet, since it may involve time-consuming operations such as 1037 * applying VJ compression, packet compression, address/control and/or 1038 * protocol field compression to the packet. 1039 */ 1040 struct mbuf * 1041 ppp_dequeue(sc) 1042 struct ppp_softc *sc; 1043 { 1044 struct mbuf *m, *mp; 1045 u_char *cp; 1046 int address, control, protocol; 1047 int s; 1048 1049 /* 1050 * Grab a packet to send: first try the fast queue, then the 1051 * normal queue. 1052 */ 1053 s = splnet(); 1054 IF_DEQUEUE(&sc->sc_fastq, m); 1055 if (m == NULL) 1056 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1057 splx(s); 1058 1059 if (m == NULL) 1060 return NULL; 1061 1062 ++sc->sc_stats.ppp_opackets; 1063 1064 /* 1065 * Extract the ppp header of the new packet. 1066 * The ppp header will be in one mbuf. 1067 */ 1068 cp = mtod(m, u_char *); 1069 address = PPP_ADDRESS(cp); 1070 control = PPP_CONTROL(cp); 1071 protocol = PPP_PROTOCOL(cp); 1072 1073 switch (protocol) { 1074 case PPP_IP: 1075 #ifdef VJC 1076 /* 1077 * If the packet is a TCP/IP packet, see if we can compress it. 1078 */ 1079 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1080 struct ip *ip; 1081 int type; 1082 1083 mp = m; 1084 ip = (struct ip *) (cp + PPP_HDRLEN); 1085 if (mp->m_len <= PPP_HDRLEN) { 1086 mp = mp->m_next; 1087 if (mp == NULL) 1088 break; 1089 ip = mtod(mp, struct ip *); 1090 } 1091 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1092 if (ip->ip_p == IPPROTO_TCP) { 1093 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1094 !(sc->sc_flags & SC_NO_TCP_CCID)); 1095 switch (type) { 1096 case TYPE_UNCOMPRESSED_TCP: 1097 protocol = PPP_VJC_UNCOMP; 1098 break; 1099 case TYPE_COMPRESSED_TCP: 1100 protocol = PPP_VJC_COMP; 1101 cp = mtod(m, u_char *); 1102 cp[0] = address; /* header has moved */ 1103 cp[1] = control; 1104 cp[2] = 0; 1105 break; 1106 } 1107 cp[3] = protocol; /* update protocol in PPP header */ 1108 } 1109 } 1110 #endif /* VJC */ 1111 break; 1112 1113 #ifdef PPP_COMPRESS 1114 case PPP_CCP: 1115 ppp_ccp(sc, m, 0); 1116 break; 1117 #endif /* PPP_COMPRESS */ 1118 } 1119 1120 #ifdef PPP_COMPRESS 1121 if (protocol != PPP_LCP && protocol != PPP_CCP 1122 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1123 struct mbuf *mcomp = NULL; 1124 int slen, clen; 1125 1126 slen = 0; 1127 for (mp = m; mp != NULL; mp = mp->m_next) 1128 slen += mp->m_len; 1129 clen = (*sc->sc_xcomp->compress) 1130 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1131 if (mcomp != NULL) { 1132 if (sc->sc_flags & SC_CCP_UP) { 1133 /* Send the compressed packet instead of the original. */ 1134 m_freem(m); 1135 m = mcomp; 1136 cp = mtod(m, u_char *); 1137 protocol = cp[3]; 1138 } else { 1139 /* Can't transmit compressed packets until CCP is up. */ 1140 m_freem(mcomp); 1141 } 1142 } 1143 } 1144 #endif /* PPP_COMPRESS */ 1145 1146 /* 1147 * Compress the address/control and protocol, if possible. 1148 */ 1149 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1150 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1151 protocol != PPP_LCP) { 1152 /* can compress address/control */ 1153 m->m_data += 2; 1154 m->m_len -= 2; 1155 } 1156 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1157 /* can compress protocol */ 1158 if (mtod(m, u_char *) == cp) { 1159 cp[2] = cp[1]; /* move address/control up */ 1160 cp[1] = cp[0]; 1161 } 1162 ++m->m_data; 1163 --m->m_len; 1164 } 1165 1166 return m; 1167 } 1168 1169 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1170 void 1171 pppnetisr(void) 1172 { 1173 struct ppp_softc *sc; 1174 int i; 1175 1176 for (i = 0; i < NPPP; i++) { 1177 sc = &ppp_softc[i]; 1178 pppintr(sc); 1179 } 1180 } 1181 #endif 1182 1183 /* 1184 * Software interrupt routine, called at splsoftnet. 1185 */ 1186 void 1187 pppintr(void *arg) 1188 { 1189 struct ppp_softc *sc = arg; 1190 struct mbuf *m; 1191 int s; 1192 1193 if (!(sc->sc_flags & SC_TBUSY) 1194 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1195 || sc->sc_outm)) { 1196 s = splhigh(); /* XXX IMP ME HARDER */ 1197 sc->sc_flags |= SC_TBUSY; 1198 splx(s); 1199 (*sc->sc_start)(sc); 1200 } 1201 for (;;) { 1202 s = splnet(); 1203 IF_DEQUEUE(&sc->sc_rawq, m); 1204 splx(s); 1205 if (m == NULL) 1206 break; 1207 ppp_inproc(sc, m); 1208 } 1209 } 1210 1211 #ifdef PPP_COMPRESS 1212 /* 1213 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1214 * 0 if it is about to be transmitted. 1215 */ 1216 static void 1217 ppp_ccp(sc, m, rcvd) 1218 struct ppp_softc *sc; 1219 struct mbuf *m; 1220 int rcvd; 1221 { 1222 u_char *dp, *ep; 1223 struct mbuf *mp; 1224 int slen, s; 1225 1226 /* 1227 * Get a pointer to the data after the PPP header. 1228 */ 1229 if (m->m_len <= PPP_HDRLEN) { 1230 mp = m->m_next; 1231 if (mp == NULL) 1232 return; 1233 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1234 } else { 1235 mp = m; 1236 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1237 } 1238 1239 ep = mtod(mp, u_char *) + mp->m_len; 1240 if (dp + CCP_HDRLEN > ep) 1241 return; 1242 slen = CCP_LENGTH(dp); 1243 if (dp + slen > ep) { 1244 if (sc->sc_flags & SC_DEBUG) 1245 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1246 dp, slen, mtod(mp, u_char *), mp->m_len); 1247 return; 1248 } 1249 1250 switch (CCP_CODE(dp)) { 1251 case CCP_CONFREQ: 1252 case CCP_TERMREQ: 1253 case CCP_TERMACK: 1254 /* CCP must be going down - disable compression */ 1255 if (sc->sc_flags & SC_CCP_UP) { 1256 s = splhigh(); /* XXX IMP ME HARDER */ 1257 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1258 splx(s); 1259 } 1260 break; 1261 1262 case CCP_CONFACK: 1263 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1264 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1265 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1266 if (!rcvd) { 1267 /* we're agreeing to send compressed packets. */ 1268 if (sc->sc_xc_state != NULL 1269 && (*sc->sc_xcomp->comp_init) 1270 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1271 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1272 s = splhigh(); /* XXX IMP ME HARDER */ 1273 sc->sc_flags |= SC_COMP_RUN; 1274 splx(s); 1275 } 1276 } else { 1277 /* peer is agreeing to send compressed packets. */ 1278 if (sc->sc_rc_state != NULL 1279 && (*sc->sc_rcomp->decomp_init) 1280 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1281 sc->sc_unit, 0, sc->sc_mru, 1282 sc->sc_flags & SC_DEBUG)) { 1283 s = splhigh(); /* XXX IMP ME HARDER */ 1284 sc->sc_flags |= SC_DECOMP_RUN; 1285 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1286 splx(s); 1287 } 1288 } 1289 } 1290 break; 1291 1292 case CCP_RESETACK: 1293 if (sc->sc_flags & SC_CCP_UP) { 1294 if (!rcvd) { 1295 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1296 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1297 } else { 1298 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1299 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1300 s = splhigh(); /* XXX IMP ME HARDER */ 1301 sc->sc_flags &= ~SC_DC_ERROR; 1302 splx(s); 1303 } 1304 } 1305 } 1306 break; 1307 } 1308 } 1309 1310 /* 1311 * CCP is down; free (de)compressor state if necessary. 1312 */ 1313 static void 1314 ppp_ccp_closed(sc) 1315 struct ppp_softc *sc; 1316 { 1317 if (sc->sc_xc_state) { 1318 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1319 sc->sc_xc_state = NULL; 1320 } 1321 if (sc->sc_rc_state) { 1322 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1323 sc->sc_rc_state = NULL; 1324 } 1325 } 1326 #endif /* PPP_COMPRESS */ 1327 1328 /* 1329 * PPP packet input routine. 1330 * The caller has checked and removed the FCS and has inserted 1331 * the address/control bytes and the protocol high byte if they 1332 * were omitted. 1333 */ 1334 void 1335 ppppktin(sc, m, lost) 1336 struct ppp_softc *sc; 1337 struct mbuf *m; 1338 int lost; 1339 { 1340 int s = splhigh(); /* XXX IMP ME HARDER */ 1341 1342 if (lost) 1343 m->m_flags |= M_ERRMARK; 1344 IF_ENQUEUE(&sc->sc_rawq, m); 1345 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1346 softintr_schedule(sc->sc_si); 1347 #else 1348 schednetisr(NETISR_PPP); 1349 #endif 1350 splx(s); 1351 } 1352 1353 /* 1354 * Process a received PPP packet, doing decompression as necessary. 1355 * Should be called at splsoftnet. 1356 */ 1357 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1358 TYPE_UNCOMPRESSED_TCP) 1359 1360 static void 1361 ppp_inproc(sc, m) 1362 struct ppp_softc *sc; 1363 struct mbuf *m; 1364 { 1365 struct ifnet *ifp = &sc->sc_if; 1366 struct ifqueue *inq; 1367 int s, ilen, proto, rv; 1368 u_char *cp, adrs, ctrl; 1369 struct mbuf *mp, *dmp = NULL; 1370 #ifdef VJC 1371 int xlen; 1372 u_char *iphdr; 1373 u_int hlen; 1374 #endif 1375 1376 sc->sc_stats.ppp_ipackets++; 1377 1378 if (sc->sc_flags & SC_LOG_INPKT) { 1379 ilen = 0; 1380 for (mp = m; mp != NULL; mp = mp->m_next) 1381 ilen += mp->m_len; 1382 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1383 pppdumpm(m); 1384 } 1385 1386 cp = mtod(m, u_char *); 1387 adrs = PPP_ADDRESS(cp); 1388 ctrl = PPP_CONTROL(cp); 1389 proto = PPP_PROTOCOL(cp); 1390 1391 if (m->m_flags & M_ERRMARK) { 1392 m->m_flags &= ~M_ERRMARK; 1393 s = splhigh(); /* XXX IMP ME HARDER */ 1394 sc->sc_flags |= SC_VJ_RESET; 1395 splx(s); 1396 } 1397 1398 #ifdef PPP_COMPRESS 1399 /* 1400 * Decompress this packet if necessary, update the receiver's 1401 * dictionary, or take appropriate action on a CCP packet. 1402 */ 1403 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1404 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1405 /* decompress this packet */ 1406 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1407 if (rv == DECOMP_OK) { 1408 m_freem(m); 1409 if (dmp == NULL) { 1410 /* no error, but no decompressed packet produced */ 1411 return; 1412 } 1413 m = dmp; 1414 cp = mtod(m, u_char *); 1415 proto = PPP_PROTOCOL(cp); 1416 1417 } else { 1418 /* 1419 * An error has occurred in decompression. 1420 * Pass the compressed packet up to pppd, which may take 1421 * CCP down or issue a Reset-Req. 1422 */ 1423 if (sc->sc_flags & SC_DEBUG) 1424 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1425 s = splhigh(); /* XXX IMP ME HARDER */ 1426 sc->sc_flags |= SC_VJ_RESET; 1427 if (rv == DECOMP_ERROR) 1428 sc->sc_flags |= SC_DC_ERROR; 1429 else 1430 sc->sc_flags |= SC_DC_FERROR; 1431 splx(s); 1432 } 1433 1434 } else { 1435 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1436 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1437 } 1438 if (proto == PPP_CCP) { 1439 ppp_ccp(sc, m, 1); 1440 } 1441 } 1442 #endif 1443 1444 ilen = 0; 1445 for (mp = m; mp != NULL; mp = mp->m_next) 1446 ilen += mp->m_len; 1447 1448 #ifdef VJC 1449 if (sc->sc_flags & SC_VJ_RESET) { 1450 /* 1451 * If we've missed a packet, we must toss subsequent compressed 1452 * packets which don't have an explicit connection ID. 1453 */ 1454 if (sc->sc_comp) 1455 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1456 s = splhigh(); /* XXX IMP ME HARDER */ 1457 sc->sc_flags &= ~SC_VJ_RESET; 1458 splx(s); 1459 } 1460 1461 /* 1462 * See if we have a VJ-compressed packet to uncompress. 1463 */ 1464 if (proto == PPP_VJC_COMP) { 1465 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1466 goto bad; 1467 1468 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1469 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1470 sc->sc_comp, &iphdr, &hlen); 1471 1472 if (xlen <= 0) { 1473 if (sc->sc_flags & SC_DEBUG) 1474 printf("%s: VJ uncompress failed on type comp\n", 1475 ifp->if_xname); 1476 goto bad; 1477 } 1478 1479 /* Copy the PPP and IP headers into a new mbuf. */ 1480 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1481 if (mp == NULL) 1482 goto bad; 1483 mp->m_len = 0; 1484 mp->m_next = NULL; 1485 if (hlen + PPP_HDRLEN > MHLEN) { 1486 MCLGET(mp, M_DONTWAIT); 1487 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1488 m_freem(mp); 1489 goto bad; /* lose if big headers and no clusters */ 1490 } 1491 } 1492 cp = mtod(mp, u_char *); 1493 cp[0] = adrs; 1494 cp[1] = ctrl; 1495 cp[2] = 0; 1496 cp[3] = PPP_IP; 1497 proto = PPP_IP; 1498 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1499 mp->m_len = hlen + PPP_HDRLEN; 1500 1501 /* 1502 * Trim the PPP and VJ headers off the old mbuf 1503 * and stick the new and old mbufs together. 1504 */ 1505 m->m_data += PPP_HDRLEN + xlen; 1506 m->m_len -= PPP_HDRLEN + xlen; 1507 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1508 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1509 mp->m_len += m->m_len; 1510 MFREE(m, mp->m_next); 1511 } else 1512 mp->m_next = m; 1513 m = mp; 1514 ilen += hlen - xlen; 1515 1516 } else if (proto == PPP_VJC_UNCOMP) { 1517 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1518 goto bad; 1519 1520 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1521 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1522 sc->sc_comp, &iphdr, &hlen); 1523 1524 if (xlen < 0) { 1525 if (sc->sc_flags & SC_DEBUG) 1526 printf("%s: VJ uncompress failed on type uncomp\n", 1527 ifp->if_xname); 1528 goto bad; 1529 } 1530 1531 proto = PPP_IP; 1532 cp[3] = PPP_IP; 1533 } 1534 #endif /* VJC */ 1535 1536 /* 1537 * If the packet will fit in a header mbuf, don't waste a 1538 * whole cluster on it. 1539 */ 1540 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1541 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1542 if (mp != NULL) { 1543 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1544 m_freem(m); 1545 m = mp; 1546 m->m_len = ilen; 1547 } 1548 } 1549 m->m_pkthdr.len = ilen; 1550 m->m_pkthdr.rcvif = ifp; 1551 1552 if ((proto & 0x8000) == 0) { 1553 #ifdef PPP_FILTER 1554 /* 1555 * See whether we want to pass this packet, and 1556 * if it counts as link activity. 1557 */ 1558 if (sc->sc_pass_filt_in.bf_insns != 0 1559 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1560 ilen, 0) == 0) { 1561 /* drop this packet */ 1562 m_freem(m); 1563 return; 1564 } 1565 if (sc->sc_active_filt_in.bf_insns == 0 1566 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1567 ilen, 0)) 1568 sc->sc_last_recv = time.tv_sec; 1569 #else 1570 /* 1571 * Record the time that we received this packet. 1572 */ 1573 sc->sc_last_recv = time.tv_sec; 1574 #endif /* PPP_FILTER */ 1575 } 1576 1577 #if NBPFILTER > 0 1578 /* See if bpf wants to look at the packet. */ 1579 if (sc->sc_if.if_bpf) 1580 bpf_mtap(sc->sc_if.if_bpf, m); 1581 #endif 1582 1583 rv = 0; 1584 switch (proto) { 1585 #ifdef INET 1586 case PPP_IP: 1587 /* 1588 * IP packet - take off the ppp header and pass it up to IP. 1589 */ 1590 if ((ifp->if_flags & IFF_UP) == 0 1591 || sc->sc_npmode[NP_IP] != 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 #ifdef GATEWAY 1600 if (ipflow_fastforward(m)) 1601 return; 1602 #endif 1603 schednetisr(NETISR_IP); 1604 inq = &ipintrq; 1605 break; 1606 #endif 1607 1608 #ifdef INET6 1609 case PPP_IPV6: 1610 /* 1611 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1612 */ 1613 if ((ifp->if_flags & IFF_UP) == 0 1614 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1615 /* interface is down - drop the packet. */ 1616 m_freem(m); 1617 return; 1618 } 1619 m->m_pkthdr.len -= PPP_HDRLEN; 1620 m->m_data += PPP_HDRLEN; 1621 m->m_len -= PPP_HDRLEN; 1622 schednetisr(NETISR_IPV6); 1623 inq = &ip6intrq; 1624 break; 1625 #endif 1626 1627 default: 1628 /* 1629 * Some other protocol - place on input queue for read(). 1630 */ 1631 inq = &sc->sc_inq; 1632 rv = 1; 1633 break; 1634 } 1635 1636 /* 1637 * Put the packet on the appropriate input queue. 1638 */ 1639 s = splnet(); 1640 if (IF_QFULL(inq)) { 1641 IF_DROP(inq); 1642 splx(s); 1643 if (sc->sc_flags & SC_DEBUG) 1644 printf("%s: input queue full\n", ifp->if_xname); 1645 ifp->if_iqdrops++; 1646 goto bad; 1647 } 1648 IF_ENQUEUE(inq, m); 1649 splx(s); 1650 ifp->if_ipackets++; 1651 ifp->if_ibytes += ilen; 1652 1653 if (rv) 1654 (*sc->sc_ctlp)(sc); 1655 1656 return; 1657 1658 bad: 1659 m_freem(m); 1660 sc->sc_if.if_ierrors++; 1661 sc->sc_stats.ppp_ierrors++; 1662 } 1663 1664 #define MAX_DUMP_BYTES 128 1665 1666 static void 1667 pppdumpm(m0) 1668 struct mbuf *m0; 1669 { 1670 char buf[3*MAX_DUMP_BYTES+4]; 1671 char *bp = buf; 1672 struct mbuf *m; 1673 static char digits[] = "0123456789abcdef"; 1674 1675 for (m = m0; m; m = m->m_next) { 1676 int l = m->m_len; 1677 u_char *rptr = (u_char *)m->m_data; 1678 1679 while (l--) { 1680 if (bp > buf + sizeof(buf) - 4) 1681 goto done; 1682 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1683 *bp++ = digits[*rptr++ & 0xf]; 1684 } 1685 1686 if (m->m_next) { 1687 if (bp > buf + sizeof(buf) - 3) 1688 goto done; 1689 *bp++ = '|'; 1690 } else 1691 *bp++ = ' '; 1692 } 1693 done: 1694 if (m) 1695 *bp++ = '>'; 1696 *bp = 0; 1697 printf("%s\n", buf); 1698 } 1699
Indexes created Fri Oct 03 02:09:57 GMT 2025