if_ppp.c revision 1.72
1 /* $NetBSD: if_ppp.c,v 1.72 2001/11/12 23:49:41 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 1.72 2001/11/12 23:49:41 lukem Exp $"); 90 91 #include "ppp.h" 92 93 #if NPPP > 0 94 95 #include "opt_inet.h" 96 #include "opt_gateway.h" 97 #include "opt_ppp.h" 98 99 #ifdef INET 100 #define VJC 101 #endif 102 #define PPP_COMPRESS 103 104 #include <sys/param.h> 105 #include <sys/proc.h> 106 #include <sys/mbuf.h> 107 #include <sys/socket.h> 108 #include <sys/ioctl.h> 109 #include <sys/kernel.h> 110 #include <sys/systm.h> 111 #include <sys/time.h> 112 #include <sys/malloc.h> 113 114 #include <net/if.h> 115 #include <net/if_types.h> 116 #include <net/netisr.h> 117 #include <net/route.h> 118 #ifdef PPP_FILTER 119 #include <net/bpf.h> 120 #endif 121 122 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 123 #include <machine/intr.h> 124 #endif 125 126 #include <netinet/in.h> 127 #include <netinet/in_systm.h> 128 #include <netinet/in_var.h> 129 #ifdef INET 130 #include <netinet/ip.h> 131 #endif 132 133 #include "bpfilter.h" 134 #if NBPFILTER > 0 135 #include <sys/time.h> 136 #include <net/bpf.h> 137 #endif 138 139 #if defined(PPP_FILTER) || NBPFILTER > 0 140 #include <net/slip.h> 141 #endif 142 143 #ifdef VJC 144 #include <net/slcompress.h> 145 #endif 146 147 #include <net/ppp_defs.h> 148 #include <net/if_ppp.h> 149 #include <net/if_pppvar.h> 150 #include <machine/cpu.h> 151 152 #ifdef PPP_COMPRESS 153 #define PACKETPTR struct mbuf * 154 #include <net/ppp-comp.h> 155 #endif 156 157 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 158 static void ppp_requeue __P((struct ppp_softc *)); 159 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 160 static void ppp_ccp_closed __P((struct ppp_softc *)); 161 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 162 static void pppdumpm __P((struct mbuf *m0)); 163 164 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 165 void pppnetisr(void); 166 #endif 167 void pppintr(void *); 168 169 /* 170 * Some useful mbuf macros not in mbuf.h. 171 */ 172 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 173 174 #define M_DATASTART(m) \ 175 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 176 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 177 178 #define M_DATASIZE(m) \ 179 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 180 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 181 182 /* 183 * We define two link layer specific mbuf flags, to mark high-priority 184 * packets for output, and received packets following lost/corrupted 185 * packets. 186 */ 187 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 188 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 189 190 #ifdef PPP_COMPRESS 191 /* 192 * List of compressors we know about. 193 * We leave some space so maybe we can modload compressors. 194 */ 195 196 extern struct compressor ppp_bsd_compress; 197 extern struct compressor ppp_deflate, ppp_deflate_draft; 198 199 struct compressor *ppp_compressors[8] = { 200 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 201 &ppp_bsd_compress, 202 #endif 203 #if DO_DEFLATE && defined(PPP_DEFLATE) 204 &ppp_deflate, 205 &ppp_deflate_draft, 206 #endif 207 NULL 208 }; 209 #endif /* PPP_COMPRESS */ 210 211 212 /* 213 * Called from boot code to establish ppp interfaces. 214 */ 215 void 216 pppattach() 217 { 218 struct ppp_softc *sc; 219 int i = 0; 220 221 for (sc = ppp_softc; i < NPPP; sc++) { 222 sc->sc_unit = i; /* XXX */ 223 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 224 callout_init(&sc->sc_timo_ch); 225 sc->sc_if.if_softc = sc; 226 sc->sc_if.if_mtu = PPP_MTU; 227 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 228 sc->sc_if.if_type = IFT_PPP; 229 sc->sc_if.if_hdrlen = PPP_HDRLEN; 230 sc->sc_if.if_dlt = DLT_NULL; 231 sc->sc_if.if_ioctl = pppsioctl; 232 sc->sc_if.if_output = pppoutput; 233 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 234 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 235 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 236 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 237 IFQ_SET_READY(&sc->sc_if.if_snd); 238 if_attach(&sc->sc_if); 239 if_alloc_sadl(&sc->sc_if); 240 #if NBPFILTER > 0 241 bpfattach(&sc->sc_if, DLT_NULL, 0); 242 #endif 243 } 244 } 245 246 /* 247 * Allocate a ppp interface unit and initialize it. 248 */ 249 struct ppp_softc * 250 pppalloc(pid) 251 pid_t pid; 252 { 253 int nppp, i; 254 struct ppp_softc *sc; 255 256 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 257 if (sc->sc_xfer == pid) { 258 sc->sc_xfer = 0; 259 return sc; 260 } 261 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 262 if (sc->sc_devp == NULL) 263 break; 264 if (nppp >= NPPP) 265 return NULL; 266 267 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 268 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 269 if (sc->sc_si == NULL) { 270 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 271 return (NULL); 272 } 273 #endif 274 275 sc->sc_flags = 0; 276 sc->sc_mru = PPP_MRU; 277 sc->sc_relinq = NULL; 278 memset((char *)&sc->sc_stats, 0, sizeof(sc->sc_stats)); 279 #ifdef VJC 280 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 281 M_DEVBUF, M_NOWAIT); 282 if (sc->sc_comp) 283 sl_compress_init(sc->sc_comp); 284 #endif 285 #ifdef PPP_COMPRESS 286 sc->sc_xc_state = NULL; 287 sc->sc_rc_state = NULL; 288 #endif /* PPP_COMPRESS */ 289 for (i = 0; i < NUM_NP; ++i) 290 sc->sc_npmode[i] = NPMODE_ERROR; 291 sc->sc_npqueue = NULL; 292 sc->sc_npqtail = &sc->sc_npqueue; 293 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 294 295 return sc; 296 } 297 298 /* 299 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 300 */ 301 void 302 pppdealloc(sc) 303 struct ppp_softc *sc; 304 { 305 struct mbuf *m; 306 307 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 308 softintr_disestablish(sc->sc_si); 309 #endif 310 if_down(&sc->sc_if); 311 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 312 sc->sc_devp = NULL; 313 sc->sc_xfer = 0; 314 for (;;) { 315 IF_DEQUEUE(&sc->sc_rawq, m); 316 if (m == NULL) 317 break; 318 m_freem(m); 319 } 320 for (;;) { 321 IF_DEQUEUE(&sc->sc_inq, m); 322 if (m == NULL) 323 break; 324 m_freem(m); 325 } 326 for (;;) { 327 IF_DEQUEUE(&sc->sc_fastq, m); 328 if (m == NULL) 329 break; 330 m_freem(m); 331 } 332 while ((m = sc->sc_npqueue) != NULL) { 333 sc->sc_npqueue = m->m_nextpkt; 334 m_freem(m); 335 } 336 if (sc->sc_togo != NULL) { 337 m_freem(sc->sc_togo); 338 sc->sc_togo = NULL; 339 } 340 #ifdef PPP_COMPRESS 341 ppp_ccp_closed(sc); 342 sc->sc_xc_state = NULL; 343 sc->sc_rc_state = NULL; 344 #endif /* PPP_COMPRESS */ 345 #ifdef PPP_FILTER 346 if (sc->sc_pass_filt_in.bf_insns != 0) { 347 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 348 sc->sc_pass_filt_in.bf_insns = 0; 349 sc->sc_pass_filt_in.bf_len = 0; 350 } 351 if (sc->sc_pass_filt_out.bf_insns != 0) { 352 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 353 sc->sc_pass_filt_out.bf_insns = 0; 354 sc->sc_pass_filt_out.bf_len = 0; 355 } 356 if (sc->sc_active_filt_in.bf_insns != 0) { 357 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 358 sc->sc_active_filt_in.bf_insns = 0; 359 sc->sc_active_filt_in.bf_len = 0; 360 } 361 if (sc->sc_active_filt_out.bf_insns != 0) { 362 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 363 sc->sc_active_filt_out.bf_insns = 0; 364 sc->sc_active_filt_out.bf_len = 0; 365 } 366 #endif /* PPP_FILTER */ 367 #ifdef VJC 368 if (sc->sc_comp != 0) { 369 FREE(sc->sc_comp, M_DEVBUF); 370 sc->sc_comp = 0; 371 } 372 #endif 373 } 374 375 /* 376 * Ioctl routine for generic ppp devices. 377 */ 378 int 379 pppioctl(sc, cmd, data, flag, p) 380 struct ppp_softc *sc; 381 u_long cmd; 382 caddr_t data; 383 int flag; 384 struct proc *p; 385 { 386 int s, error, flags, mru, npx; 387 u_int nb; 388 struct ppp_option_data *odp; 389 struct compressor **cp; 390 struct npioctl *npi; 391 time_t t; 392 #ifdef PPP_FILTER 393 struct bpf_program *bp, *nbp; 394 struct bpf_insn *newcode, *oldcode; 395 int newcodelen; 396 #endif /* PPP_FILTER */ 397 #ifdef PPP_COMPRESS 398 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 399 #endif 400 401 switch (cmd) { 402 case FIONREAD: 403 *(int *)data = sc->sc_inq.ifq_len; 404 break; 405 406 case PPPIOCGUNIT: 407 *(int *)data = sc->sc_unit; /* XXX */ 408 break; 409 410 case PPPIOCGFLAGS: 411 *(u_int *)data = sc->sc_flags; 412 break; 413 414 case PPPIOCSFLAGS: 415 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 416 return (error); 417 flags = *(int *)data & SC_MASK; 418 s = splsoftnet(); 419 #ifdef PPP_COMPRESS 420 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 421 ppp_ccp_closed(sc); 422 #endif 423 splhigh(); /* XXX IMP ME HARDER */ 424 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 425 splx(s); 426 break; 427 428 case PPPIOCSMRU: 429 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 430 return (error); 431 mru = *(int *)data; 432 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 433 sc->sc_mru = mru; 434 break; 435 436 case PPPIOCGMRU: 437 *(int *)data = sc->sc_mru; 438 break; 439 440 #ifdef VJC 441 case PPPIOCSMAXCID: 442 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 443 return (error); 444 if (sc->sc_comp) { 445 s = splsoftnet(); 446 sl_compress_setup(sc->sc_comp, *(int *)data); 447 splx(s); 448 } 449 break; 450 #endif 451 452 case PPPIOCXFERUNIT: 453 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 454 return (error); 455 sc->sc_xfer = p->p_pid; 456 break; 457 458 #ifdef PPP_COMPRESS 459 case PPPIOCSCOMPRESS: 460 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 461 return (error); 462 odp = (struct ppp_option_data *) data; 463 nb = odp->length; 464 if (nb > sizeof(ccp_option)) 465 nb = sizeof(ccp_option); 466 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 467 return (error); 468 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 469 return (EINVAL); 470 for (cp = ppp_compressors; *cp != NULL; ++cp) 471 if ((*cp)->compress_proto == ccp_option[0]) { 472 /* 473 * Found a handler for the protocol - try to allocate 474 * a compressor or decompressor. 475 */ 476 error = 0; 477 if (odp->transmit) { 478 s = splsoftnet(); 479 if (sc->sc_xc_state != NULL) 480 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 481 sc->sc_xcomp = *cp; 482 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 483 if (sc->sc_xc_state == NULL) { 484 if (sc->sc_flags & SC_DEBUG) 485 printf("%s: comp_alloc failed\n", 486 sc->sc_if.if_xname); 487 error = ENOBUFS; 488 } 489 splhigh(); /* XXX IMP ME HARDER */ 490 sc->sc_flags &= ~SC_COMP_RUN; 491 splx(s); 492 } else { 493 s = splsoftnet(); 494 if (sc->sc_rc_state != NULL) 495 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 496 sc->sc_rcomp = *cp; 497 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 498 if (sc->sc_rc_state == NULL) { 499 if (sc->sc_flags & SC_DEBUG) 500 printf("%s: decomp_alloc failed\n", 501 sc->sc_if.if_xname); 502 error = ENOBUFS; 503 } 504 splhigh(); /* XXX IMP ME HARDER */ 505 sc->sc_flags &= ~SC_DECOMP_RUN; 506 splx(s); 507 } 508 return (error); 509 } 510 if (sc->sc_flags & SC_DEBUG) 511 printf("%s: no compressor for [%x %x %x], %x\n", 512 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 513 ccp_option[2], nb); 514 return (EINVAL); /* no handler found */ 515 #endif /* PPP_COMPRESS */ 516 517 case PPPIOCGNPMODE: 518 case PPPIOCSNPMODE: 519 npi = (struct npioctl *) data; 520 switch (npi->protocol) { 521 case PPP_IP: 522 npx = NP_IP; 523 break; 524 case PPP_IPV6: 525 npx = NP_IPV6; 526 break; 527 default: 528 return EINVAL; 529 } 530 if (cmd == PPPIOCGNPMODE) { 531 npi->mode = sc->sc_npmode[npx]; 532 } else { 533 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 534 return (error); 535 if (npi->mode != sc->sc_npmode[npx]) { 536 s = splnet(); 537 sc->sc_npmode[npx] = npi->mode; 538 if (npi->mode != NPMODE_QUEUE) { 539 ppp_requeue(sc); 540 ppp_restart(sc); 541 } 542 splx(s); 543 } 544 } 545 break; 546 547 case PPPIOCGIDLE: 548 s = splsoftnet(); 549 t = time.tv_sec; 550 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 551 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 552 splx(s); 553 break; 554 555 #ifdef PPP_FILTER 556 case PPPIOCSPASS: 557 case PPPIOCSACTIVE: 558 /* These are no longer supported. */ 559 return EOPNOTSUPP; 560 561 case PPPIOCSIPASS: 562 case PPPIOCSOPASS: 563 case PPPIOCSIACTIVE: 564 case PPPIOCSOACTIVE: 565 nbp = (struct bpf_program *) data; 566 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 567 return EINVAL; 568 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 569 if (newcodelen != 0) { 570 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 571 /* WAITOK -- malloc() never fails. */ 572 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 573 newcodelen)) != 0) { 574 free(newcode, M_DEVBUF); 575 return error; 576 } 577 if (!bpf_validate(newcode, nbp->bf_len)) { 578 free(newcode, M_DEVBUF); 579 return EINVAL; 580 } 581 } else 582 newcode = 0; 583 switch (cmd) { 584 case PPPIOCSIPASS: 585 bp = &sc->sc_pass_filt_in; 586 break; 587 588 case PPPIOCSOPASS: 589 bp = &sc->sc_pass_filt_out; 590 break; 591 592 case PPPIOCSIACTIVE: 593 bp = &sc->sc_active_filt_in; 594 break; 595 596 case PPPIOCSOACTIVE: 597 bp = &sc->sc_active_filt_out; 598 break; 599 } 600 oldcode = bp->bf_insns; 601 s = splnet(); 602 bp->bf_len = nbp->bf_len; 603 bp->bf_insns = newcode; 604 splx(s); 605 if (oldcode != 0) 606 free(oldcode, M_DEVBUF); 607 break; 608 #endif /* PPP_FILTER */ 609 610 default: 611 return (-1); 612 } 613 return (0); 614 } 615 616 /* 617 * Process an ioctl request to the ppp network interface. 618 */ 619 static int 620 pppsioctl(ifp, cmd, data) 621 struct ifnet *ifp; 622 u_long cmd; 623 caddr_t data; 624 { 625 struct proc *p = curproc; /* XXX */ 626 struct ppp_softc *sc = ifp->if_softc; 627 struct ifaddr *ifa = (struct ifaddr *)data; 628 struct ifreq *ifr = (struct ifreq *)data; 629 struct ppp_stats *psp; 630 #ifdef PPP_COMPRESS 631 struct ppp_comp_stats *pcp; 632 #endif 633 int s = splnet(), error = 0; 634 635 switch (cmd) { 636 case SIOCSIFFLAGS: 637 if ((ifp->if_flags & IFF_RUNNING) == 0) 638 ifp->if_flags &= ~IFF_UP; 639 break; 640 641 case SIOCSIFADDR: 642 switch (ifa->ifa_addr->sa_family) { 643 #ifdef INET 644 case AF_INET: 645 break; 646 #endif 647 #ifdef INET6 648 case AF_INET6: 649 break; 650 #endif 651 default: 652 error = EAFNOSUPPORT; 653 break; 654 } 655 break; 656 657 case SIOCSIFDSTADDR: 658 switch (ifa->ifa_addr->sa_family) { 659 #ifdef INET 660 case AF_INET: 661 break; 662 #endif 663 #ifdef INET6 664 case AF_INET6: 665 break; 666 #endif 667 default: 668 error = EAFNOSUPPORT; 669 break; 670 } 671 break; 672 673 case SIOCSIFMTU: 674 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 675 break; 676 sc->sc_if.if_mtu = ifr->ifr_mtu; 677 break; 678 679 case SIOCGIFMTU: 680 ifr->ifr_mtu = sc->sc_if.if_mtu; 681 break; 682 683 case SIOCADDMULTI: 684 case SIOCDELMULTI: 685 if (ifr == 0) { 686 error = EAFNOSUPPORT; 687 break; 688 } 689 switch(ifr->ifr_addr.sa_family) { 690 #ifdef INET 691 case AF_INET: 692 break; 693 #endif 694 #ifdef INET6 695 case AF_INET6: 696 break; 697 #endif 698 default: 699 error = EAFNOSUPPORT; 700 break; 701 } 702 break; 703 704 case SIOCGPPPSTATS: 705 psp = &((struct ifpppstatsreq *) data)->stats; 706 memset(psp, 0, sizeof(*psp)); 707 psp->p = sc->sc_stats; 708 #if defined(VJC) && !defined(SL_NO_STATS) 709 if (sc->sc_comp) { 710 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 711 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 712 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 713 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 714 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 715 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 716 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 717 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 718 } 719 #endif /* VJC */ 720 break; 721 722 #ifdef PPP_COMPRESS 723 case SIOCGPPPCSTATS: 724 pcp = &((struct ifpppcstatsreq *) data)->stats; 725 memset(pcp, 0, sizeof(*pcp)); 726 if (sc->sc_xc_state != NULL) 727 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 728 if (sc->sc_rc_state != NULL) 729 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 730 break; 731 #endif /* PPP_COMPRESS */ 732 733 default: 734 error = EINVAL; 735 } 736 splx(s); 737 return (error); 738 } 739 740 /* 741 * Queue a packet. Start transmission if not active. 742 * Packet is placed in Information field of PPP frame. 743 */ 744 int 745 pppoutput(ifp, m0, dst, rtp) 746 struct ifnet *ifp; 747 struct mbuf *m0; 748 struct sockaddr *dst; 749 struct rtentry *rtp; 750 { 751 struct ppp_softc *sc = ifp->if_softc; 752 int protocol, address, control; 753 u_char *cp; 754 int s, error; 755 #ifdef INET 756 struct ip *ip; 757 #endif 758 struct ifqueue *ifq; 759 enum NPmode mode; 760 int len; 761 struct mbuf *m; 762 ALTQ_DECL(struct altq_pktattr pktattr;) 763 764 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 765 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 766 error = ENETDOWN; /* sort of */ 767 goto bad; 768 } 769 770 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 771 772 /* 773 * Compute PPP header. 774 */ 775 m0->m_flags &= ~M_HIGHPRI; 776 switch (dst->sa_family) { 777 #ifdef INET 778 case AF_INET: 779 address = PPP_ALLSTATIONS; 780 control = PPP_UI; 781 protocol = PPP_IP; 782 mode = sc->sc_npmode[NP_IP]; 783 784 /* 785 * If this packet has the "low delay" bit set in the IP header, 786 * put it on the fastq instead. 787 */ 788 ip = mtod(m0, struct ip *); 789 if (ip->ip_tos & IPTOS_LOWDELAY) 790 m0->m_flags |= M_HIGHPRI; 791 break; 792 #endif 793 #ifdef INET6 794 case AF_INET6: 795 address = PPP_ALLSTATIONS; /*XXX*/ 796 control = PPP_UI; /*XXX*/ 797 protocol = PPP_IPV6; 798 mode = sc->sc_npmode[NP_IPV6]; 799 800 #if 0 /* XXX flowinfo/traffic class, maybe? */ 801 /* 802 * If this packet has the "low delay" bit set in the IP header, 803 * put it on the fastq instead. 804 */ 805 ip = mtod(m0, struct ip *); 806 if (ip->ip_tos & IPTOS_LOWDELAY) 807 m0->m_flags |= M_HIGHPRI; 808 #endif 809 break; 810 #endif 811 case AF_UNSPEC: 812 address = PPP_ADDRESS(dst->sa_data); 813 control = PPP_CONTROL(dst->sa_data); 814 protocol = PPP_PROTOCOL(dst->sa_data); 815 mode = NPMODE_PASS; 816 break; 817 default: 818 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 819 error = EAFNOSUPPORT; 820 goto bad; 821 } 822 823 /* 824 * Drop this packet, or return an error, if necessary. 825 */ 826 if (mode == NPMODE_ERROR) { 827 error = ENETDOWN; 828 goto bad; 829 } 830 if (mode == NPMODE_DROP) { 831 error = 0; 832 goto bad; 833 } 834 835 /* 836 * Add PPP header. If no space in first mbuf, allocate another. 837 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 838 */ 839 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 840 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 841 if (m0 == 0) { 842 error = ENOBUFS; 843 goto bad; 844 } 845 m0->m_len = 0; 846 } else 847 m0->m_data -= PPP_HDRLEN; 848 849 cp = mtod(m0, u_char *); 850 *cp++ = address; 851 *cp++ = control; 852 *cp++ = protocol >> 8; 853 *cp++ = protocol & 0xff; 854 m0->m_len += PPP_HDRLEN; 855 856 len = 0; 857 for (m = m0; m != 0; m = m->m_next) 858 len += m->m_len; 859 860 if (sc->sc_flags & SC_LOG_OUTPKT) { 861 printf("%s output: ", ifp->if_xname); 862 pppdumpm(m0); 863 } 864 865 if ((protocol & 0x8000) == 0) { 866 #ifdef PPP_FILTER 867 /* 868 * Apply the pass and active filters to the packet, 869 * but only if it is a data packet. 870 */ 871 if (sc->sc_pass_filt_out.bf_insns != 0 872 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 873 len, 0) == 0) { 874 error = 0; /* drop this packet */ 875 goto bad; 876 } 877 878 /* 879 * Update the time we sent the most recent packet. 880 */ 881 if (sc->sc_active_filt_out.bf_insns == 0 882 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 883 len, 0)) 884 sc->sc_last_sent = time.tv_sec; 885 #else 886 /* 887 * Update the time we sent the most recent packet. 888 */ 889 sc->sc_last_sent = time.tv_sec; 890 #endif /* PPP_FILTER */ 891 } 892 893 #if NBPFILTER > 0 894 /* 895 * See if bpf wants to look at the packet. 896 */ 897 if (sc->sc_if.if_bpf) 898 bpf_mtap(sc->sc_if.if_bpf, m0); 899 #endif 900 901 /* 902 * Put the packet on the appropriate queue. 903 */ 904 s = splnet(); 905 if (mode == NPMODE_QUEUE) { 906 /* XXX we should limit the number of packets on this queue */ 907 *sc->sc_npqtail = m0; 908 m0->m_nextpkt = NULL; 909 sc->sc_npqtail = &m0->m_nextpkt; 910 } else { 911 if ((m0->m_flags & M_HIGHPRI) 912 #ifdef ALTQ 913 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 914 #endif 915 ) { 916 ifq = &sc->sc_fastq; 917 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 918 IF_DROP(ifq); 919 splx(s); 920 error = ENOBUFS; 921 goto bad; 922 } else { 923 IF_ENQUEUE(ifq, m0); 924 error = 0; 925 } 926 } else 927 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 928 if (error) { 929 splx(s); 930 sc->sc_if.if_oerrors++; 931 sc->sc_stats.ppp_oerrors++; 932 return (error); 933 } 934 ppp_restart(sc); 935 } 936 ifp->if_opackets++; 937 ifp->if_obytes += len; 938 939 splx(s); 940 return (0); 941 942 bad: 943 m_freem(m0); 944 return (error); 945 } 946 947 /* 948 * After a change in the NPmode for some NP, move packets from the 949 * npqueue to the send queue or the fast queue as appropriate. 950 * Should be called at splnet, since we muck with the queues. 951 */ 952 static void 953 ppp_requeue(sc) 954 struct ppp_softc *sc; 955 { 956 struct mbuf *m, **mpp; 957 struct ifqueue *ifq; 958 enum NPmode mode; 959 int error; 960 961 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 962 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 963 case PPP_IP: 964 mode = sc->sc_npmode[NP_IP]; 965 break; 966 case PPP_IPV6: 967 mode = sc->sc_npmode[NP_IPV6]; 968 break; 969 default: 970 mode = NPMODE_PASS; 971 } 972 973 switch (mode) { 974 case NPMODE_PASS: 975 /* 976 * This packet can now go on one of the queues to be sent. 977 */ 978 *mpp = m->m_nextpkt; 979 m->m_nextpkt = NULL; 980 if ((m->m_flags & M_HIGHPRI) 981 #ifdef ALTQ 982 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 983 #endif 984 ) { 985 ifq = &sc->sc_fastq; 986 if (IF_QFULL(ifq)) { 987 IF_DROP(ifq); 988 m_freem(m); 989 error = ENOBUFS; 990 } else { 991 IF_ENQUEUE(ifq, m); 992 error = 0; 993 } 994 } else 995 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 996 if (error) { 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 = splhigh(); /* XXX IMP ME HARDER */ 1025 1026 sc->sc_flags &= ~SC_TBUSY; 1027 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1028 softintr_schedule(sc->sc_si); 1029 #else 1030 schednetisr(NETISR_PPP); 1031 #endif 1032 splx(s); 1033 } 1034 1035 /* 1036 * Get a packet to send. This procedure is intended to be called at 1037 * splsoftnet, since it may involve time-consuming operations such as 1038 * applying VJ compression, packet compression, address/control and/or 1039 * protocol field compression to the packet. 1040 */ 1041 struct mbuf * 1042 ppp_dequeue(sc) 1043 struct ppp_softc *sc; 1044 { 1045 struct mbuf *m, *mp; 1046 u_char *cp; 1047 int address, control, protocol; 1048 int s; 1049 1050 /* 1051 * Grab a packet to send: first try the fast queue, then the 1052 * normal queue. 1053 */ 1054 s = splnet(); 1055 IF_DEQUEUE(&sc->sc_fastq, m); 1056 if (m == NULL) 1057 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1058 splx(s); 1059 1060 if (m == NULL) 1061 return NULL; 1062 1063 ++sc->sc_stats.ppp_opackets; 1064 1065 /* 1066 * Extract the ppp header of the new packet. 1067 * The ppp header will be in one mbuf. 1068 */ 1069 cp = mtod(m, u_char *); 1070 address = PPP_ADDRESS(cp); 1071 control = PPP_CONTROL(cp); 1072 protocol = PPP_PROTOCOL(cp); 1073 1074 switch (protocol) { 1075 case PPP_IP: 1076 #ifdef VJC 1077 /* 1078 * If the packet is a TCP/IP packet, see if we can compress it. 1079 */ 1080 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1081 struct ip *ip; 1082 int type; 1083 1084 mp = m; 1085 ip = (struct ip *) (cp + PPP_HDRLEN); 1086 if (mp->m_len <= PPP_HDRLEN) { 1087 mp = mp->m_next; 1088 if (mp == NULL) 1089 break; 1090 ip = mtod(mp, struct ip *); 1091 } 1092 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1093 if (ip->ip_p == IPPROTO_TCP) { 1094 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1095 !(sc->sc_flags & SC_NO_TCP_CCID)); 1096 switch (type) { 1097 case TYPE_UNCOMPRESSED_TCP: 1098 protocol = PPP_VJC_UNCOMP; 1099 break; 1100 case TYPE_COMPRESSED_TCP: 1101 protocol = PPP_VJC_COMP; 1102 cp = mtod(m, u_char *); 1103 cp[0] = address; /* header has moved */ 1104 cp[1] = control; 1105 cp[2] = 0; 1106 break; 1107 } 1108 cp[3] = protocol; /* update protocol in PPP header */ 1109 } 1110 } 1111 #endif /* VJC */ 1112 break; 1113 1114 #ifdef PPP_COMPRESS 1115 case PPP_CCP: 1116 ppp_ccp(sc, m, 0); 1117 break; 1118 #endif /* PPP_COMPRESS */ 1119 } 1120 1121 #ifdef PPP_COMPRESS 1122 if (protocol != PPP_LCP && protocol != PPP_CCP 1123 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1124 struct mbuf *mcomp = NULL; 1125 int slen, clen; 1126 1127 slen = 0; 1128 for (mp = m; mp != NULL; mp = mp->m_next) 1129 slen += mp->m_len; 1130 clen = (*sc->sc_xcomp->compress) 1131 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1132 if (mcomp != NULL) { 1133 if (sc->sc_flags & SC_CCP_UP) { 1134 /* Send the compressed packet instead of the original. */ 1135 m_freem(m); 1136 m = mcomp; 1137 cp = mtod(m, u_char *); 1138 protocol = cp[3]; 1139 } else { 1140 /* Can't transmit compressed packets until CCP is up. */ 1141 m_freem(mcomp); 1142 } 1143 } 1144 } 1145 #endif /* PPP_COMPRESS */ 1146 1147 /* 1148 * Compress the address/control and protocol, if possible. 1149 */ 1150 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1151 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1152 protocol != PPP_LCP) { 1153 /* can compress address/control */ 1154 m->m_data += 2; 1155 m->m_len -= 2; 1156 } 1157 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1158 /* can compress protocol */ 1159 if (mtod(m, u_char *) == cp) { 1160 cp[2] = cp[1]; /* move address/control up */ 1161 cp[1] = cp[0]; 1162 } 1163 ++m->m_data; 1164 --m->m_len; 1165 } 1166 1167 return m; 1168 } 1169 1170 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1171 void 1172 pppnetisr(void) 1173 { 1174 struct ppp_softc *sc; 1175 int i; 1176 1177 for (i = 0; i < NPPP; i++) { 1178 sc = &ppp_softc[i]; 1179 pppintr(sc); 1180 } 1181 } 1182 #endif 1183 1184 /* 1185 * Software interrupt routine, called at splsoftnet. 1186 */ 1187 void 1188 pppintr(void *arg) 1189 { 1190 struct ppp_softc *sc = arg; 1191 struct mbuf *m; 1192 int s; 1193 1194 if (!(sc->sc_flags & SC_TBUSY) 1195 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1196 || sc->sc_outm)) { 1197 s = splhigh(); /* XXX IMP ME HARDER */ 1198 sc->sc_flags |= SC_TBUSY; 1199 splx(s); 1200 (*sc->sc_start)(sc); 1201 } 1202 for (;;) { 1203 s = splnet(); 1204 IF_DEQUEUE(&sc->sc_rawq, m); 1205 splx(s); 1206 if (m == NULL) 1207 break; 1208 ppp_inproc(sc, m); 1209 } 1210 } 1211 1212 #ifdef PPP_COMPRESS 1213 /* 1214 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1215 * 0 if it is about to be transmitted. 1216 */ 1217 static void 1218 ppp_ccp(sc, m, rcvd) 1219 struct ppp_softc *sc; 1220 struct mbuf *m; 1221 int rcvd; 1222 { 1223 u_char *dp, *ep; 1224 struct mbuf *mp; 1225 int slen, s; 1226 1227 /* 1228 * Get a pointer to the data after the PPP header. 1229 */ 1230 if (m->m_len <= PPP_HDRLEN) { 1231 mp = m->m_next; 1232 if (mp == NULL) 1233 return; 1234 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1235 } else { 1236 mp = m; 1237 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1238 } 1239 1240 ep = mtod(mp, u_char *) + mp->m_len; 1241 if (dp + CCP_HDRLEN > ep) 1242 return; 1243 slen = CCP_LENGTH(dp); 1244 if (dp + slen > ep) { 1245 if (sc->sc_flags & SC_DEBUG) 1246 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1247 dp, slen, mtod(mp, u_char *), mp->m_len); 1248 return; 1249 } 1250 1251 switch (CCP_CODE(dp)) { 1252 case CCP_CONFREQ: 1253 case CCP_TERMREQ: 1254 case CCP_TERMACK: 1255 /* CCP must be going down - disable compression */ 1256 if (sc->sc_flags & SC_CCP_UP) { 1257 s = splhigh(); /* XXX IMP ME HARDER */ 1258 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1259 splx(s); 1260 } 1261 break; 1262 1263 case CCP_CONFACK: 1264 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1265 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1266 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1267 if (!rcvd) { 1268 /* we're agreeing to send compressed packets. */ 1269 if (sc->sc_xc_state != NULL 1270 && (*sc->sc_xcomp->comp_init) 1271 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1272 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1273 s = splhigh(); /* XXX IMP ME HARDER */ 1274 sc->sc_flags |= SC_COMP_RUN; 1275 splx(s); 1276 } 1277 } else { 1278 /* peer is agreeing to send compressed packets. */ 1279 if (sc->sc_rc_state != NULL 1280 && (*sc->sc_rcomp->decomp_init) 1281 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1282 sc->sc_unit, 0, sc->sc_mru, 1283 sc->sc_flags & SC_DEBUG)) { 1284 s = splhigh(); /* XXX IMP ME HARDER */ 1285 sc->sc_flags |= SC_DECOMP_RUN; 1286 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1287 splx(s); 1288 } 1289 } 1290 } 1291 break; 1292 1293 case CCP_RESETACK: 1294 if (sc->sc_flags & SC_CCP_UP) { 1295 if (!rcvd) { 1296 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1297 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1298 } else { 1299 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1300 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1301 s = splhigh(); /* XXX IMP ME HARDER */ 1302 sc->sc_flags &= ~SC_DC_ERROR; 1303 splx(s); 1304 } 1305 } 1306 } 1307 break; 1308 } 1309 } 1310 1311 /* 1312 * CCP is down; free (de)compressor state if necessary. 1313 */ 1314 static void 1315 ppp_ccp_closed(sc) 1316 struct ppp_softc *sc; 1317 { 1318 if (sc->sc_xc_state) { 1319 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1320 sc->sc_xc_state = NULL; 1321 } 1322 if (sc->sc_rc_state) { 1323 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1324 sc->sc_rc_state = NULL; 1325 } 1326 } 1327 #endif /* PPP_COMPRESS */ 1328 1329 /* 1330 * PPP packet input routine. 1331 * The caller has checked and removed the FCS and has inserted 1332 * the address/control bytes and the protocol high byte if they 1333 * were omitted. 1334 */ 1335 void 1336 ppppktin(sc, m, lost) 1337 struct ppp_softc *sc; 1338 struct mbuf *m; 1339 int lost; 1340 { 1341 int s = splhigh(); /* XXX IMP ME HARDER */ 1342 1343 if (lost) 1344 m->m_flags |= M_ERRMARK; 1345 IF_ENQUEUE(&sc->sc_rawq, m); 1346 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1347 softintr_schedule(sc->sc_si); 1348 #else 1349 schednetisr(NETISR_PPP); 1350 #endif 1351 splx(s); 1352 } 1353 1354 /* 1355 * Process a received PPP packet, doing decompression as necessary. 1356 * Should be called at splsoftnet. 1357 */ 1358 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1359 TYPE_UNCOMPRESSED_TCP) 1360 1361 static void 1362 ppp_inproc(sc, m) 1363 struct ppp_softc *sc; 1364 struct mbuf *m; 1365 { 1366 struct ifnet *ifp = &sc->sc_if; 1367 struct ifqueue *inq; 1368 int s, ilen, proto, rv; 1369 u_char *cp, adrs, ctrl; 1370 struct mbuf *mp, *dmp = NULL; 1371 #ifdef VJC 1372 int xlen; 1373 u_char *iphdr; 1374 u_int hlen; 1375 #endif 1376 1377 sc->sc_stats.ppp_ipackets++; 1378 1379 if (sc->sc_flags & SC_LOG_INPKT) { 1380 ilen = 0; 1381 for (mp = m; mp != NULL; mp = mp->m_next) 1382 ilen += mp->m_len; 1383 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1384 pppdumpm(m); 1385 } 1386 1387 cp = mtod(m, u_char *); 1388 adrs = PPP_ADDRESS(cp); 1389 ctrl = PPP_CONTROL(cp); 1390 proto = PPP_PROTOCOL(cp); 1391 1392 if (m->m_flags & M_ERRMARK) { 1393 m->m_flags &= ~M_ERRMARK; 1394 s = splhigh(); /* XXX IMP ME HARDER */ 1395 sc->sc_flags |= SC_VJ_RESET; 1396 splx(s); 1397 } 1398 1399 #ifdef PPP_COMPRESS 1400 /* 1401 * Decompress this packet if necessary, update the receiver's 1402 * dictionary, or take appropriate action on a CCP packet. 1403 */ 1404 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1405 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1406 /* decompress this packet */ 1407 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1408 if (rv == DECOMP_OK) { 1409 m_freem(m); 1410 if (dmp == NULL) { 1411 /* no error, but no decompressed packet produced */ 1412 return; 1413 } 1414 m = dmp; 1415 cp = mtod(m, u_char *); 1416 proto = PPP_PROTOCOL(cp); 1417 1418 } else { 1419 /* 1420 * An error has occurred in decompression. 1421 * Pass the compressed packet up to pppd, which may take 1422 * CCP down or issue a Reset-Req. 1423 */ 1424 if (sc->sc_flags & SC_DEBUG) 1425 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1426 s = splhigh(); /* XXX IMP ME HARDER */ 1427 sc->sc_flags |= SC_VJ_RESET; 1428 if (rv == DECOMP_ERROR) 1429 sc->sc_flags |= SC_DC_ERROR; 1430 else 1431 sc->sc_flags |= SC_DC_FERROR; 1432 splx(s); 1433 } 1434 1435 } else { 1436 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1437 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1438 } 1439 if (proto == PPP_CCP) { 1440 ppp_ccp(sc, m, 1); 1441 } 1442 } 1443 #endif 1444 1445 ilen = 0; 1446 for (mp = m; mp != NULL; mp = mp->m_next) 1447 ilen += mp->m_len; 1448 1449 #ifdef VJC 1450 if (sc->sc_flags & SC_VJ_RESET) { 1451 /* 1452 * If we've missed a packet, we must toss subsequent compressed 1453 * packets which don't have an explicit connection ID. 1454 */ 1455 if (sc->sc_comp) 1456 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1457 s = splhigh(); /* XXX IMP ME HARDER */ 1458 sc->sc_flags &= ~SC_VJ_RESET; 1459 splx(s); 1460 } 1461 1462 /* 1463 * See if we have a VJ-compressed packet to uncompress. 1464 */ 1465 if (proto == PPP_VJC_COMP) { 1466 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1467 goto bad; 1468 1469 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1470 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1471 sc->sc_comp, &iphdr, &hlen); 1472 1473 if (xlen <= 0) { 1474 if (sc->sc_flags & SC_DEBUG) 1475 printf("%s: VJ uncompress failed on type comp\n", 1476 ifp->if_xname); 1477 goto bad; 1478 } 1479 1480 /* Copy the PPP and IP headers into a new mbuf. */ 1481 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1482 if (mp == NULL) 1483 goto bad; 1484 mp->m_len = 0; 1485 mp->m_next = NULL; 1486 if (hlen + PPP_HDRLEN > MHLEN) { 1487 MCLGET(mp, M_DONTWAIT); 1488 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1489 m_freem(mp); 1490 goto bad; /* lose if big headers and no clusters */ 1491 } 1492 } 1493 cp = mtod(mp, u_char *); 1494 cp[0] = adrs; 1495 cp[1] = ctrl; 1496 cp[2] = 0; 1497 cp[3] = PPP_IP; 1498 proto = PPP_IP; 1499 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1500 mp->m_len = hlen + PPP_HDRLEN; 1501 1502 /* 1503 * Trim the PPP and VJ headers off the old mbuf 1504 * and stick the new and old mbufs together. 1505 */ 1506 m->m_data += PPP_HDRLEN + xlen; 1507 m->m_len -= PPP_HDRLEN + xlen; 1508 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1509 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1510 mp->m_len += m->m_len; 1511 MFREE(m, mp->m_next); 1512 } else 1513 mp->m_next = m; 1514 m = mp; 1515 ilen += hlen - xlen; 1516 1517 } else if (proto == PPP_VJC_UNCOMP) { 1518 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1519 goto bad; 1520 1521 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1522 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1523 sc->sc_comp, &iphdr, &hlen); 1524 1525 if (xlen < 0) { 1526 if (sc->sc_flags & SC_DEBUG) 1527 printf("%s: VJ uncompress failed on type uncomp\n", 1528 ifp->if_xname); 1529 goto bad; 1530 } 1531 1532 proto = PPP_IP; 1533 cp[3] = PPP_IP; 1534 } 1535 #endif /* VJC */ 1536 1537 /* 1538 * If the packet will fit in a header mbuf, don't waste a 1539 * whole cluster on it. 1540 */ 1541 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1542 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1543 if (mp != NULL) { 1544 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1545 m_freem(m); 1546 m = mp; 1547 m->m_len = ilen; 1548 } 1549 } 1550 m->m_pkthdr.len = ilen; 1551 m->m_pkthdr.rcvif = ifp; 1552 1553 if ((proto & 0x8000) == 0) { 1554 #ifdef PPP_FILTER 1555 /* 1556 * See whether we want to pass this packet, and 1557 * if it counts as link activity. 1558 */ 1559 if (sc->sc_pass_filt_in.bf_insns != 0 1560 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1561 ilen, 0) == 0) { 1562 /* drop this packet */ 1563 m_freem(m); 1564 return; 1565 } 1566 if (sc->sc_active_filt_in.bf_insns == 0 1567 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1568 ilen, 0)) 1569 sc->sc_last_recv = time.tv_sec; 1570 #else 1571 /* 1572 * Record the time that we received this packet. 1573 */ 1574 sc->sc_last_recv = time.tv_sec; 1575 #endif /* PPP_FILTER */ 1576 } 1577 1578 #if NBPFILTER > 0 1579 /* See if bpf wants to look at the packet. */ 1580 if (sc->sc_if.if_bpf) 1581 bpf_mtap(sc->sc_if.if_bpf, m); 1582 #endif 1583 1584 rv = 0; 1585 switch (proto) { 1586 #ifdef INET 1587 case PPP_IP: 1588 /* 1589 * IP packet - take off the ppp header and pass it up to IP. 1590 */ 1591 if ((ifp->if_flags & IFF_UP) == 0 1592 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1593 /* interface is down - drop the packet. */ 1594 m_freem(m); 1595 return; 1596 } 1597 m->m_pkthdr.len -= PPP_HDRLEN; 1598 m->m_data += PPP_HDRLEN; 1599 m->m_len -= PPP_HDRLEN; 1600 #ifdef GATEWAY 1601 if (ipflow_fastforward(m)) 1602 return; 1603 #endif 1604 schednetisr(NETISR_IP); 1605 inq = &ipintrq; 1606 break; 1607 #endif 1608 1609 #ifdef INET6 1610 case PPP_IPV6: 1611 /* 1612 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1613 */ 1614 if ((ifp->if_flags & IFF_UP) == 0 1615 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1616 /* interface is down - drop the packet. */ 1617 m_freem(m); 1618 return; 1619 } 1620 m->m_pkthdr.len -= PPP_HDRLEN; 1621 m->m_data += PPP_HDRLEN; 1622 m->m_len -= PPP_HDRLEN; 1623 schednetisr(NETISR_IPV6); 1624 inq = &ip6intrq; 1625 break; 1626 #endif 1627 1628 default: 1629 /* 1630 * Some other protocol - place on input queue for read(). 1631 */ 1632 inq = &sc->sc_inq; 1633 rv = 1; 1634 break; 1635 } 1636 1637 /* 1638 * Put the packet on the appropriate input queue. 1639 */ 1640 s = splnet(); 1641 if (IF_QFULL(inq)) { 1642 IF_DROP(inq); 1643 splx(s); 1644 if (sc->sc_flags & SC_DEBUG) 1645 printf("%s: input queue full\n", ifp->if_xname); 1646 ifp->if_iqdrops++; 1647 goto bad; 1648 } 1649 IF_ENQUEUE(inq, m); 1650 splx(s); 1651 ifp->if_ipackets++; 1652 ifp->if_ibytes += ilen; 1653 1654 if (rv) 1655 (*sc->sc_ctlp)(sc); 1656 1657 return; 1658 1659 bad: 1660 m_freem(m); 1661 sc->sc_if.if_ierrors++; 1662 sc->sc_stats.ppp_ierrors++; 1663 } 1664 1665 #define MAX_DUMP_BYTES 128 1666 1667 static void 1668 pppdumpm(m0) 1669 struct mbuf *m0; 1670 { 1671 char buf[3*MAX_DUMP_BYTES+4]; 1672 char *bp = buf; 1673 struct mbuf *m; 1674 static char digits[] = "0123456789abcdef"; 1675 1676 for (m = m0; m; m = m->m_next) { 1677 int l = m->m_len; 1678 u_char *rptr = (u_char *)m->m_data; 1679 1680 while (l--) { 1681 if (bp > buf + sizeof(buf) - 4) 1682 goto done; 1683 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1684 *bp++ = digits[*rptr++ & 0xf]; 1685 } 1686 1687 if (m->m_next) { 1688 if (bp > buf + sizeof(buf) - 3) 1689 goto done; 1690 *bp++ = '|'; 1691 } else 1692 *bp++ = ' '; 1693 } 1694 done: 1695 if (m) 1696 *bp++ = '>'; 1697 *bp = 0; 1698 printf("%s\n", buf); 1699 } 1700 1701 #endif /* NPPP > 0 */ 1702
Indexes created Thu Sep 25 16:09:42 GMT 2025