1 /* $NetBSD: if_ppp.c,v 1.77 2002/05/12 20:38:15 matt 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@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@seismo.ARPA 55 * seismo!rick 56 * 57 * Pounded on heavily by Chris Torek (chris@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@cayman.com) 62 * Added VJ tcp header compression; more unified ioctls 63 * 64 * Extensively modified by Paul Mackerras (paulus@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@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 1.77 2002/05/12 20:38:15 matt 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 #include <machine/intr.h> 121 122 #include <netinet/in.h> 123 #include <netinet/in_systm.h> 124 #include <netinet/in_var.h> 125 #ifdef INET 126 #include <netinet/ip.h> 127 #endif 128 129 #include "bpfilter.h" 130 #if NBPFILTER > 0 131 #include <sys/time.h> 132 #include <net/bpf.h> 133 #endif 134 135 #if defined(PPP_FILTER) || NBPFILTER > 0 136 #include <net/slip.h> 137 #endif 138 139 #ifdef VJC 140 #include <net/slcompress.h> 141 #endif 142 143 #include <net/ppp_defs.h> 144 #include <net/if_ppp.h> 145 #include <net/if_pppvar.h> 146 #include <machine/cpu.h> 147 148 #ifdef PPP_COMPRESS 149 #define PACKETPTR struct mbuf * 150 #include <net/ppp-comp.h> 151 #endif 152 153 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 154 static void ppp_requeue __P((struct ppp_softc *)); 155 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 156 static void ppp_ccp_closed __P((struct ppp_softc *)); 157 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 158 static void pppdumpm __P((struct mbuf *m0)); 159 #ifdef ALTQ 160 static void ppp_ifstart __P((struct ifnet *ifp)); 161 #endif 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 struct ppp_softc ppp_softc[NPPP]; 190 191 #ifdef PPP_COMPRESS 192 /* 193 * List of compressors we know about. 194 * We leave some space so maybe we can modload compressors. 195 */ 196 197 extern struct compressor ppp_bsd_compress; 198 extern struct compressor ppp_deflate, ppp_deflate_draft; 199 200 struct compressor *ppp_compressors[8] = { 201 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 202 &ppp_bsd_compress, 203 #endif 204 #if DO_DEFLATE && defined(PPP_DEFLATE) 205 &ppp_deflate, 206 &ppp_deflate_draft, 207 #endif 208 NULL 209 }; 210 #endif /* PPP_COMPRESS */ 211 212 213 /* 214 * Called from boot code to establish ppp interfaces. 215 */ 216 void 217 pppattach() 218 { 219 struct ppp_softc *sc; 220 int i = 0; 221 222 for (sc = ppp_softc; i < NPPP; sc++) { 223 sc->sc_unit = i; /* XXX */ 224 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 225 callout_init(&sc->sc_timo_ch); 226 sc->sc_if.if_softc = sc; 227 sc->sc_if.if_mtu = PPP_MTU; 228 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 229 sc->sc_if.if_type = IFT_PPP; 230 sc->sc_if.if_hdrlen = PPP_HDRLEN; 231 sc->sc_if.if_dlt = DLT_NULL; 232 sc->sc_if.if_ioctl = pppsioctl; 233 sc->sc_if.if_output = pppoutput; 234 #ifdef ALTQ 235 sc->sc_if.if_start = ppp_ifstart; 236 #endif 237 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 238 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 239 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 240 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 241 IFQ_SET_READY(&sc->sc_if.if_snd); 242 if_attach(&sc->sc_if); 243 if_alloc_sadl(&sc->sc_if); 244 #if NBPFILTER > 0 245 bpfattach(&sc->sc_if, DLT_NULL, 0); 246 #endif 247 } 248 } 249 250 /* 251 * Allocate a ppp interface unit and initialize it. 252 */ 253 struct ppp_softc * 254 pppalloc(pid) 255 pid_t pid; 256 { 257 int nppp, i; 258 struct ppp_softc *sc; 259 260 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 261 if (sc->sc_xfer == pid) { 262 sc->sc_xfer = 0; 263 return sc; 264 } 265 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 266 if (sc->sc_devp == NULL) 267 break; 268 if (nppp >= NPPP) 269 return NULL; 270 271 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 272 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 273 if (sc->sc_si == NULL) { 274 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 275 return (NULL); 276 } 277 #endif 278 279 sc->sc_flags = 0; 280 sc->sc_mru = PPP_MRU; 281 sc->sc_relinq = NULL; 282 memset((char *)&sc->sc_stats, 0, sizeof(sc->sc_stats)); 283 #ifdef VJC 284 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 285 M_DEVBUF, M_NOWAIT); 286 if (sc->sc_comp) 287 sl_compress_init(sc->sc_comp); 288 #endif 289 #ifdef PPP_COMPRESS 290 sc->sc_xc_state = NULL; 291 sc->sc_rc_state = NULL; 292 #endif /* PPP_COMPRESS */ 293 for (i = 0; i < NUM_NP; ++i) 294 sc->sc_npmode[i] = NPMODE_ERROR; 295 sc->sc_npqueue = NULL; 296 sc->sc_npqtail = &sc->sc_npqueue; 297 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 298 299 return sc; 300 } 301 302 /* 303 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 304 */ 305 void 306 pppdealloc(sc) 307 struct ppp_softc *sc; 308 { 309 struct mbuf *m; 310 311 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 312 softintr_disestablish(sc->sc_si); 313 #endif 314 if_down(&sc->sc_if); 315 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 316 sc->sc_devp = NULL; 317 sc->sc_xfer = 0; 318 for (;;) { 319 IF_DEQUEUE(&sc->sc_rawq, m); 320 if (m == NULL) 321 break; 322 m_freem(m); 323 } 324 for (;;) { 325 IF_DEQUEUE(&sc->sc_inq, m); 326 if (m == NULL) 327 break; 328 m_freem(m); 329 } 330 for (;;) { 331 IF_DEQUEUE(&sc->sc_fastq, m); 332 if (m == NULL) 333 break; 334 m_freem(m); 335 } 336 while ((m = sc->sc_npqueue) != NULL) { 337 sc->sc_npqueue = m->m_nextpkt; 338 m_freem(m); 339 } 340 if (sc->sc_togo != NULL) { 341 m_freem(sc->sc_togo); 342 sc->sc_togo = NULL; 343 } 344 #ifdef PPP_COMPRESS 345 ppp_ccp_closed(sc); 346 sc->sc_xc_state = NULL; 347 sc->sc_rc_state = NULL; 348 #endif /* PPP_COMPRESS */ 349 #ifdef PPP_FILTER 350 if (sc->sc_pass_filt_in.bf_insns != 0) { 351 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 352 sc->sc_pass_filt_in.bf_insns = 0; 353 sc->sc_pass_filt_in.bf_len = 0; 354 } 355 if (sc->sc_pass_filt_out.bf_insns != 0) { 356 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 357 sc->sc_pass_filt_out.bf_insns = 0; 358 sc->sc_pass_filt_out.bf_len = 0; 359 } 360 if (sc->sc_active_filt_in.bf_insns != 0) { 361 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 362 sc->sc_active_filt_in.bf_insns = 0; 363 sc->sc_active_filt_in.bf_len = 0; 364 } 365 if (sc->sc_active_filt_out.bf_insns != 0) { 366 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 367 sc->sc_active_filt_out.bf_insns = 0; 368 sc->sc_active_filt_out.bf_len = 0; 369 } 370 #endif /* PPP_FILTER */ 371 #ifdef VJC 372 if (sc->sc_comp != 0) { 373 FREE(sc->sc_comp, M_DEVBUF); 374 sc->sc_comp = 0; 375 } 376 #endif 377 } 378 379 /* 380 * Ioctl routine for generic ppp devices. 381 */ 382 int 383 pppioctl(sc, cmd, data, flag, p) 384 struct ppp_softc *sc; 385 u_long cmd; 386 caddr_t data; 387 int flag; 388 struct proc *p; 389 { 390 int s, error, flags, mru, npx; 391 u_int nb; 392 struct ppp_option_data *odp; 393 struct compressor **cp; 394 struct npioctl *npi; 395 time_t t; 396 #ifdef PPP_FILTER 397 struct bpf_program *bp, *nbp; 398 struct bpf_insn *newcode, *oldcode; 399 int newcodelen; 400 #endif /* PPP_FILTER */ 401 #ifdef PPP_COMPRESS 402 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 403 #endif 404 405 switch (cmd) { 406 case FIONREAD: 407 *(int *)data = sc->sc_inq.ifq_len; 408 break; 409 410 case PPPIOCGUNIT: 411 *(int *)data = sc->sc_unit; /* XXX */ 412 break; 413 414 case PPPIOCGFLAGS: 415 *(u_int *)data = sc->sc_flags; 416 break; 417 418 case PPPIOCSFLAGS: 419 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 420 return (error); 421 flags = *(int *)data & SC_MASK; 422 s = splsoftnet(); 423 #ifdef PPP_COMPRESS 424 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 425 ppp_ccp_closed(sc); 426 #endif 427 splhigh(); /* XXX IMP ME HARDER */ 428 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 429 splx(s); 430 break; 431 432 case PPPIOCSMRU: 433 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 434 return (error); 435 mru = *(int *)data; 436 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 437 sc->sc_mru = mru; 438 break; 439 440 case PPPIOCGMRU: 441 *(int *)data = sc->sc_mru; 442 break; 443 444 #ifdef VJC 445 case PPPIOCSMAXCID: 446 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 447 return (error); 448 if (sc->sc_comp) { 449 s = splsoftnet(); 450 sl_compress_setup(sc->sc_comp, *(int *)data); 451 splx(s); 452 } 453 break; 454 #endif 455 456 case PPPIOCXFERUNIT: 457 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 458 return (error); 459 sc->sc_xfer = p->p_pid; 460 break; 461 462 #ifdef PPP_COMPRESS 463 case PPPIOCSCOMPRESS: 464 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 465 return (error); 466 odp = (struct ppp_option_data *) data; 467 nb = odp->length; 468 if (nb > sizeof(ccp_option)) 469 nb = sizeof(ccp_option); 470 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 471 return (error); 472 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 473 return (EINVAL); 474 for (cp = ppp_compressors; *cp != NULL; ++cp) 475 if ((*cp)->compress_proto == ccp_option[0]) { 476 /* 477 * Found a handler for the protocol - try to allocate 478 * a compressor or decompressor. 479 */ 480 error = 0; 481 if (odp->transmit) { 482 s = splsoftnet(); 483 if (sc->sc_xc_state != NULL) 484 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 485 sc->sc_xcomp = *cp; 486 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 487 if (sc->sc_xc_state == NULL) { 488 if (sc->sc_flags & SC_DEBUG) 489 printf("%s: comp_alloc failed\n", 490 sc->sc_if.if_xname); 491 error = ENOBUFS; 492 } 493 splhigh(); /* XXX IMP ME HARDER */ 494 sc->sc_flags &= ~SC_COMP_RUN; 495 splx(s); 496 } else { 497 s = splsoftnet(); 498 if (sc->sc_rc_state != NULL) 499 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 500 sc->sc_rcomp = *cp; 501 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 502 if (sc->sc_rc_state == NULL) { 503 if (sc->sc_flags & SC_DEBUG) 504 printf("%s: decomp_alloc failed\n", 505 sc->sc_if.if_xname); 506 error = ENOBUFS; 507 } 508 splhigh(); /* XXX IMP ME HARDER */ 509 sc->sc_flags &= ~SC_DECOMP_RUN; 510 splx(s); 511 } 512 return (error); 513 } 514 if (sc->sc_flags & SC_DEBUG) 515 printf("%s: no compressor for [%x %x %x], %x\n", 516 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 517 ccp_option[2], nb); 518 return (EINVAL); /* no handler found */ 519 #endif /* PPP_COMPRESS */ 520 521 case PPPIOCGNPMODE: 522 case PPPIOCSNPMODE: 523 npi = (struct npioctl *) data; 524 switch (npi->protocol) { 525 case PPP_IP: 526 npx = NP_IP; 527 break; 528 case PPP_IPV6: 529 npx = NP_IPV6; 530 break; 531 default: 532 return EINVAL; 533 } 534 if (cmd == PPPIOCGNPMODE) { 535 npi->mode = sc->sc_npmode[npx]; 536 } else { 537 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 538 return (error); 539 if (npi->mode != sc->sc_npmode[npx]) { 540 s = splnet(); 541 sc->sc_npmode[npx] = npi->mode; 542 if (npi->mode != NPMODE_QUEUE) { 543 ppp_requeue(sc); 544 ppp_restart(sc); 545 } 546 splx(s); 547 } 548 } 549 break; 550 551 case PPPIOCGIDLE: 552 s = splsoftnet(); 553 t = time.tv_sec; 554 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 555 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 556 splx(s); 557 break; 558 559 #ifdef PPP_FILTER 560 case PPPIOCSPASS: 561 case PPPIOCSACTIVE: 562 /* These are no longer supported. */ 563 return EOPNOTSUPP; 564 565 case PPPIOCSIPASS: 566 case PPPIOCSOPASS: 567 case PPPIOCSIACTIVE: 568 case PPPIOCSOACTIVE: 569 nbp = (struct bpf_program *) data; 570 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 571 return EINVAL; 572 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 573 if (newcodelen != 0) { 574 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 575 /* WAITOK -- malloc() never fails. */ 576 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 577 newcodelen)) != 0) { 578 free(newcode, M_DEVBUF); 579 return error; 580 } 581 if (!bpf_validate(newcode, nbp->bf_len)) { 582 free(newcode, M_DEVBUF); 583 return EINVAL; 584 } 585 } else 586 newcode = 0; 587 switch (cmd) { 588 case PPPIOCSIPASS: 589 bp = &sc->sc_pass_filt_in; 590 break; 591 592 case PPPIOCSOPASS: 593 bp = &sc->sc_pass_filt_out; 594 break; 595 596 case PPPIOCSIACTIVE: 597 bp = &sc->sc_active_filt_in; 598 break; 599 600 case PPPIOCSOACTIVE: 601 bp = &sc->sc_active_filt_out; 602 break; 603 } 604 oldcode = bp->bf_insns; 605 s = splnet(); 606 bp->bf_len = nbp->bf_len; 607 bp->bf_insns = newcode; 608 splx(s); 609 if (oldcode != 0) 610 free(oldcode, M_DEVBUF); 611 break; 612 #endif /* PPP_FILTER */ 613 614 default: 615 return (EPASSTHROUGH); 616 } 617 return (0); 618 } 619 620 /* 621 * Process an ioctl request to the ppp network interface. 622 */ 623 static int 624 pppsioctl(ifp, cmd, data) 625 struct ifnet *ifp; 626 u_long cmd; 627 caddr_t data; 628 { 629 struct proc *p = curproc; /* XXX */ 630 struct ppp_softc *sc = ifp->if_softc; 631 struct ifaddr *ifa = (struct ifaddr *)data; 632 struct ifreq *ifr = (struct ifreq *)data; 633 struct ppp_stats *psp; 634 #ifdef PPP_COMPRESS 635 struct ppp_comp_stats *pcp; 636 #endif 637 int s = splnet(), error = 0; 638 639 switch (cmd) { 640 case SIOCSIFFLAGS: 641 if ((ifp->if_flags & IFF_RUNNING) == 0) 642 ifp->if_flags &= ~IFF_UP; 643 break; 644 645 case SIOCSIFADDR: 646 switch (ifa->ifa_addr->sa_family) { 647 #ifdef INET 648 case AF_INET: 649 break; 650 #endif 651 #ifdef INET6 652 case AF_INET6: 653 break; 654 #endif 655 default: 656 error = EAFNOSUPPORT; 657 break; 658 } 659 break; 660 661 case SIOCSIFDSTADDR: 662 switch (ifa->ifa_addr->sa_family) { 663 #ifdef INET 664 case AF_INET: 665 break; 666 #endif 667 #ifdef INET6 668 case AF_INET6: 669 break; 670 #endif 671 default: 672 error = EAFNOSUPPORT; 673 break; 674 } 675 break; 676 677 case SIOCSIFMTU: 678 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 679 break; 680 sc->sc_if.if_mtu = ifr->ifr_mtu; 681 break; 682 683 case SIOCGIFMTU: 684 ifr->ifr_mtu = sc->sc_if.if_mtu; 685 break; 686 687 case SIOCADDMULTI: 688 case SIOCDELMULTI: 689 if (ifr == 0) { 690 error = EAFNOSUPPORT; 691 break; 692 } 693 switch(ifr->ifr_addr.sa_family) { 694 #ifdef INET 695 case AF_INET: 696 break; 697 #endif 698 #ifdef INET6 699 case AF_INET6: 700 break; 701 #endif 702 default: 703 error = EAFNOSUPPORT; 704 break; 705 } 706 break; 707 708 case SIOCGPPPSTATS: 709 psp = &((struct ifpppstatsreq *) data)->stats; 710 memset(psp, 0, sizeof(*psp)); 711 psp->p = sc->sc_stats; 712 #if defined(VJC) && !defined(SL_NO_STATS) 713 if (sc->sc_comp) { 714 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 715 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 716 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 717 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 718 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 719 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 720 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 721 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 722 } 723 #endif /* VJC */ 724 break; 725 726 #ifdef PPP_COMPRESS 727 case SIOCGPPPCSTATS: 728 pcp = &((struct ifpppcstatsreq *) data)->stats; 729 memset(pcp, 0, sizeof(*pcp)); 730 if (sc->sc_xc_state != NULL) 731 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 732 if (sc->sc_rc_state != NULL) 733 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 734 break; 735 #endif /* PPP_COMPRESS */ 736 737 default: 738 error = EINVAL; 739 } 740 splx(s); 741 return (error); 742 } 743 744 /* 745 * Queue a packet. Start transmission if not active. 746 * Packet is placed in Information field of PPP frame. 747 */ 748 int 749 pppoutput(ifp, m0, dst, rtp) 750 struct ifnet *ifp; 751 struct mbuf *m0; 752 struct sockaddr *dst; 753 struct rtentry *rtp; 754 { 755 struct ppp_softc *sc = ifp->if_softc; 756 int protocol, address, control; 757 u_char *cp; 758 int s, error; 759 #ifdef INET 760 struct ip *ip; 761 #endif 762 struct ifqueue *ifq; 763 enum NPmode mode; 764 int len; 765 struct mbuf *m; 766 ALTQ_DECL(struct altq_pktattr pktattr;) 767 768 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 769 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 770 error = ENETDOWN; /* sort of */ 771 goto bad; 772 } 773 774 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 775 776 /* 777 * Compute PPP header. 778 */ 779 m0->m_flags &= ~M_HIGHPRI; 780 switch (dst->sa_family) { 781 #ifdef INET 782 case AF_INET: 783 address = PPP_ALLSTATIONS; 784 control = PPP_UI; 785 protocol = PPP_IP; 786 mode = sc->sc_npmode[NP_IP]; 787 788 /* 789 * If this packet has the "low delay" bit set in the IP header, 790 * put it on the fastq instead. 791 */ 792 ip = mtod(m0, struct ip *); 793 if (ip->ip_tos & IPTOS_LOWDELAY) 794 m0->m_flags |= M_HIGHPRI; 795 break; 796 #endif 797 #ifdef INET6 798 case AF_INET6: 799 address = PPP_ALLSTATIONS; /*XXX*/ 800 control = PPP_UI; /*XXX*/ 801 protocol = PPP_IPV6; 802 mode = sc->sc_npmode[NP_IPV6]; 803 804 #if 0 /* XXX flowinfo/traffic class, maybe? */ 805 /* 806 * If this packet has the "low delay" bit set in the IP header, 807 * put it on the fastq instead. 808 */ 809 ip = mtod(m0, struct ip *); 810 if (ip->ip_tos & IPTOS_LOWDELAY) 811 m0->m_flags |= M_HIGHPRI; 812 #endif 813 break; 814 #endif 815 case AF_UNSPEC: 816 address = PPP_ADDRESS(dst->sa_data); 817 control = PPP_CONTROL(dst->sa_data); 818 protocol = PPP_PROTOCOL(dst->sa_data); 819 mode = NPMODE_PASS; 820 break; 821 default: 822 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 823 error = EAFNOSUPPORT; 824 goto bad; 825 } 826 827 /* 828 * Drop this packet, or return an error, if necessary. 829 */ 830 if (mode == NPMODE_ERROR) { 831 error = ENETDOWN; 832 goto bad; 833 } 834 if (mode == NPMODE_DROP) { 835 error = 0; 836 goto bad; 837 } 838 839 /* 840 * Add PPP header. If no space in first mbuf, allocate another. 841 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 842 */ 843 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 844 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 845 if (m0 == 0) { 846 error = ENOBUFS; 847 goto bad; 848 } 849 m0->m_len = 0; 850 } else 851 m0->m_data -= PPP_HDRLEN; 852 853 cp = mtod(m0, u_char *); 854 *cp++ = address; 855 *cp++ = control; 856 *cp++ = protocol >> 8; 857 *cp++ = protocol & 0xff; 858 m0->m_len += PPP_HDRLEN; 859 860 len = 0; 861 for (m = m0; m != 0; m = m->m_next) 862 len += m->m_len; 863 864 if (sc->sc_flags & SC_LOG_OUTPKT) { 865 printf("%s output: ", ifp->if_xname); 866 pppdumpm(m0); 867 } 868 869 if ((protocol & 0x8000) == 0) { 870 #ifdef PPP_FILTER 871 /* 872 * Apply the pass and active filters to the packet, 873 * but only if it is a data packet. 874 */ 875 if (sc->sc_pass_filt_out.bf_insns != 0 876 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 877 len, 0) == 0) { 878 error = 0; /* drop this packet */ 879 goto bad; 880 } 881 882 /* 883 * Update the time we sent the most recent packet. 884 */ 885 if (sc->sc_active_filt_out.bf_insns == 0 886 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 887 len, 0)) 888 sc->sc_last_sent = time.tv_sec; 889 #else 890 /* 891 * Update the time we sent the most recent packet. 892 */ 893 sc->sc_last_sent = time.tv_sec; 894 #endif /* PPP_FILTER */ 895 } 896 897 #if NBPFILTER > 0 898 /* 899 * See if bpf wants to look at the packet. 900 */ 901 if (sc->sc_if.if_bpf) 902 bpf_mtap(sc->sc_if.if_bpf, m0); 903 #endif 904 905 /* 906 * Put the packet on the appropriate queue. 907 */ 908 s = splnet(); 909 if (mode == NPMODE_QUEUE) { 910 /* XXX we should limit the number of packets on this queue */ 911 *sc->sc_npqtail = m0; 912 m0->m_nextpkt = NULL; 913 sc->sc_npqtail = &m0->m_nextpkt; 914 } else { 915 if ((m0->m_flags & M_HIGHPRI) 916 #ifdef ALTQ 917 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 918 #endif 919 ) { 920 ifq = &sc->sc_fastq; 921 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 922 IF_DROP(ifq); 923 splx(s); 924 error = ENOBUFS; 925 goto bad; 926 } else { 927 IF_ENQUEUE(ifq, m0); 928 error = 0; 929 } 930 } else 931 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 932 if (error) { 933 splx(s); 934 sc->sc_if.if_oerrors++; 935 sc->sc_stats.ppp_oerrors++; 936 return (error); 937 } 938 ppp_restart(sc); 939 } 940 ifp->if_opackets++; 941 ifp->if_obytes += len; 942 943 splx(s); 944 return (0); 945 946 bad: 947 m_freem(m0); 948 return (error); 949 } 950 951 /* 952 * After a change in the NPmode for some NP, move packets from the 953 * npqueue to the send queue or the fast queue as appropriate. 954 * Should be called at splnet, since we muck with the queues. 955 */ 956 static void 957 ppp_requeue(sc) 958 struct ppp_softc *sc; 959 { 960 struct mbuf *m, **mpp; 961 struct ifqueue *ifq; 962 enum NPmode mode; 963 int error; 964 965 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 966 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 967 case PPP_IP: 968 mode = sc->sc_npmode[NP_IP]; 969 break; 970 case PPP_IPV6: 971 mode = sc->sc_npmode[NP_IPV6]; 972 break; 973 default: 974 mode = NPMODE_PASS; 975 } 976 977 switch (mode) { 978 case NPMODE_PASS: 979 /* 980 * This packet can now go on one of the queues to be sent. 981 */ 982 *mpp = m->m_nextpkt; 983 m->m_nextpkt = NULL; 984 if ((m->m_flags & M_HIGHPRI) 985 #ifdef ALTQ 986 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 987 #endif 988 ) { 989 ifq = &sc->sc_fastq; 990 if (IF_QFULL(ifq)) { 991 IF_DROP(ifq); 992 m_freem(m); 993 error = ENOBUFS; 994 } else { 995 IF_ENQUEUE(ifq, m); 996 error = 0; 997 } 998 } else 999 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 1000 if (error) { 1001 sc->sc_if.if_oerrors++; 1002 sc->sc_stats.ppp_oerrors++; 1003 } 1004 break; 1005 1006 case NPMODE_DROP: 1007 case NPMODE_ERROR: 1008 *mpp = m->m_nextpkt; 1009 m_freem(m); 1010 break; 1011 1012 case NPMODE_QUEUE: 1013 mpp = &m->m_nextpkt; 1014 break; 1015 } 1016 } 1017 sc->sc_npqtail = mpp; 1018 } 1019 1020 /* 1021 * Transmitter has finished outputting some stuff; 1022 * remember to call sc->sc_start later at splsoftnet. 1023 */ 1024 void 1025 ppp_restart(sc) 1026 struct ppp_softc *sc; 1027 { 1028 int s = splhigh(); /* XXX IMP ME HARDER */ 1029 1030 sc->sc_flags &= ~SC_TBUSY; 1031 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1032 softintr_schedule(sc->sc_si); 1033 #else 1034 schednetisr(NETISR_PPP); 1035 #endif 1036 splx(s); 1037 } 1038 1039 /* 1040 * Get a packet to send. This procedure is intended to be called at 1041 * splsoftnet, since it may involve time-consuming operations such as 1042 * applying VJ compression, packet compression, address/control and/or 1043 * protocol field compression to the packet. 1044 */ 1045 struct mbuf * 1046 ppp_dequeue(sc) 1047 struct ppp_softc *sc; 1048 { 1049 struct mbuf *m, *mp; 1050 u_char *cp; 1051 int address, control, protocol; 1052 int s; 1053 1054 /* 1055 * Grab a packet to send: first try the fast queue, then the 1056 * normal queue. 1057 */ 1058 s = splnet(); 1059 IF_DEQUEUE(&sc->sc_fastq, m); 1060 if (m == NULL) 1061 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1062 splx(s); 1063 1064 if (m == NULL) 1065 return NULL; 1066 1067 ++sc->sc_stats.ppp_opackets; 1068 1069 /* 1070 * Extract the ppp header of the new packet. 1071 * The ppp header will be in one mbuf. 1072 */ 1073 cp = mtod(m, u_char *); 1074 address = PPP_ADDRESS(cp); 1075 control = PPP_CONTROL(cp); 1076 protocol = PPP_PROTOCOL(cp); 1077 1078 switch (protocol) { 1079 case PPP_IP: 1080 #ifdef VJC 1081 /* 1082 * If the packet is a TCP/IP packet, see if we can compress it. 1083 */ 1084 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1085 struct ip *ip; 1086 int type; 1087 1088 mp = m; 1089 ip = (struct ip *) (cp + PPP_HDRLEN); 1090 if (mp->m_len <= PPP_HDRLEN) { 1091 mp = mp->m_next; 1092 if (mp == NULL) 1093 break; 1094 ip = mtod(mp, struct ip *); 1095 } 1096 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1097 if (ip->ip_p == IPPROTO_TCP) { 1098 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1099 !(sc->sc_flags & SC_NO_TCP_CCID)); 1100 switch (type) { 1101 case TYPE_UNCOMPRESSED_TCP: 1102 protocol = PPP_VJC_UNCOMP; 1103 break; 1104 case TYPE_COMPRESSED_TCP: 1105 protocol = PPP_VJC_COMP; 1106 cp = mtod(m, u_char *); 1107 cp[0] = address; /* header has moved */ 1108 cp[1] = control; 1109 cp[2] = 0; 1110 break; 1111 } 1112 cp[3] = protocol; /* update protocol in PPP header */ 1113 } 1114 } 1115 #endif /* VJC */ 1116 break; 1117 1118 #ifdef PPP_COMPRESS 1119 case PPP_CCP: 1120 ppp_ccp(sc, m, 0); 1121 break; 1122 #endif /* PPP_COMPRESS */ 1123 } 1124 1125 #ifdef PPP_COMPRESS 1126 if (protocol != PPP_LCP && protocol != PPP_CCP 1127 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1128 struct mbuf *mcomp = NULL; 1129 int slen, clen; 1130 1131 slen = 0; 1132 for (mp = m; mp != NULL; mp = mp->m_next) 1133 slen += mp->m_len; 1134 clen = (*sc->sc_xcomp->compress) 1135 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1136 if (mcomp != NULL) { 1137 if (sc->sc_flags & SC_CCP_UP) { 1138 /* Send the compressed packet instead of the original. */ 1139 m_freem(m); 1140 m = mcomp; 1141 cp = mtod(m, u_char *); 1142 protocol = cp[3]; 1143 } else { 1144 /* Can't transmit compressed packets until CCP is up. */ 1145 m_freem(mcomp); 1146 } 1147 } 1148 } 1149 #endif /* PPP_COMPRESS */ 1150 1151 /* 1152 * Compress the address/control and protocol, if possible. 1153 */ 1154 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1155 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1156 protocol != PPP_LCP) { 1157 /* can compress address/control */ 1158 m->m_data += 2; 1159 m->m_len -= 2; 1160 } 1161 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1162 /* can compress protocol */ 1163 if (mtod(m, u_char *) == cp) { 1164 cp[2] = cp[1]; /* move address/control up */ 1165 cp[1] = cp[0]; 1166 } 1167 ++m->m_data; 1168 --m->m_len; 1169 } 1170 1171 return m; 1172 } 1173 1174 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1175 void 1176 pppnetisr(void) 1177 { 1178 struct ppp_softc *sc; 1179 int i; 1180 1181 for (i = 0; i < NPPP; i++) { 1182 sc = &ppp_softc[i]; 1183 pppintr(sc); 1184 } 1185 } 1186 #endif 1187 1188 /* 1189 * Software interrupt routine, called at splsoftnet. 1190 */ 1191 void 1192 pppintr(void *arg) 1193 { 1194 struct ppp_softc *sc = arg; 1195 struct mbuf *m; 1196 int s; 1197 1198 if (!(sc->sc_flags & SC_TBUSY) 1199 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1200 || sc->sc_outm)) { 1201 s = splhigh(); /* XXX IMP ME HARDER */ 1202 sc->sc_flags |= SC_TBUSY; 1203 splx(s); 1204 (*sc->sc_start)(sc); 1205 } 1206 for (;;) { 1207 s = splnet(); 1208 IF_DEQUEUE(&sc->sc_rawq, m); 1209 splx(s); 1210 if (m == NULL) 1211 break; 1212 ppp_inproc(sc, m); 1213 } 1214 } 1215 1216 #ifdef PPP_COMPRESS 1217 /* 1218 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1219 * 0 if it is about to be transmitted. 1220 */ 1221 static void 1222 ppp_ccp(sc, m, rcvd) 1223 struct ppp_softc *sc; 1224 struct mbuf *m; 1225 int rcvd; 1226 { 1227 u_char *dp, *ep; 1228 struct mbuf *mp; 1229 int slen, s; 1230 1231 /* 1232 * Get a pointer to the data after the PPP header. 1233 */ 1234 if (m->m_len <= PPP_HDRLEN) { 1235 mp = m->m_next; 1236 if (mp == NULL) 1237 return; 1238 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1239 } else { 1240 mp = m; 1241 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1242 } 1243 1244 ep = mtod(mp, u_char *) + mp->m_len; 1245 if (dp + CCP_HDRLEN > ep) 1246 return; 1247 slen = CCP_LENGTH(dp); 1248 if (dp + slen > ep) { 1249 if (sc->sc_flags & SC_DEBUG) 1250 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1251 dp, slen, mtod(mp, u_char *), mp->m_len); 1252 return; 1253 } 1254 1255 switch (CCP_CODE(dp)) { 1256 case CCP_CONFREQ: 1257 case CCP_TERMREQ: 1258 case CCP_TERMACK: 1259 /* CCP must be going down - disable compression */ 1260 if (sc->sc_flags & SC_CCP_UP) { 1261 s = splhigh(); /* XXX IMP ME HARDER */ 1262 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1263 splx(s); 1264 } 1265 break; 1266 1267 case CCP_CONFACK: 1268 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1269 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1270 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1271 if (!rcvd) { 1272 /* we're agreeing to send compressed packets. */ 1273 if (sc->sc_xc_state != NULL 1274 && (*sc->sc_xcomp->comp_init) 1275 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1276 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1277 s = splhigh(); /* XXX IMP ME HARDER */ 1278 sc->sc_flags |= SC_COMP_RUN; 1279 splx(s); 1280 } 1281 } else { 1282 /* peer is agreeing to send compressed packets. */ 1283 if (sc->sc_rc_state != NULL 1284 && (*sc->sc_rcomp->decomp_init) 1285 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1286 sc->sc_unit, 0, sc->sc_mru, 1287 sc->sc_flags & SC_DEBUG)) { 1288 s = splhigh(); /* XXX IMP ME HARDER */ 1289 sc->sc_flags |= SC_DECOMP_RUN; 1290 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1291 splx(s); 1292 } 1293 } 1294 } 1295 break; 1296 1297 case CCP_RESETACK: 1298 if (sc->sc_flags & SC_CCP_UP) { 1299 if (!rcvd) { 1300 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1301 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1302 } else { 1303 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1304 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1305 s = splhigh(); /* XXX IMP ME HARDER */ 1306 sc->sc_flags &= ~SC_DC_ERROR; 1307 splx(s); 1308 } 1309 } 1310 } 1311 break; 1312 } 1313 } 1314 1315 /* 1316 * CCP is down; free (de)compressor state if necessary. 1317 */ 1318 static void 1319 ppp_ccp_closed(sc) 1320 struct ppp_softc *sc; 1321 { 1322 if (sc->sc_xc_state) { 1323 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1324 sc->sc_xc_state = NULL; 1325 } 1326 if (sc->sc_rc_state) { 1327 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1328 sc->sc_rc_state = NULL; 1329 } 1330 } 1331 #endif /* PPP_COMPRESS */ 1332 1333 /* 1334 * PPP packet input routine. 1335 * The caller has checked and removed the FCS and has inserted 1336 * the address/control bytes and the protocol high byte if they 1337 * were omitted. 1338 */ 1339 void 1340 ppppktin(sc, m, lost) 1341 struct ppp_softc *sc; 1342 struct mbuf *m; 1343 int lost; 1344 { 1345 int s = splhigh(); /* XXX IMP ME HARDER */ 1346 1347 if (lost) 1348 m->m_flags |= M_ERRMARK; 1349 IF_ENQUEUE(&sc->sc_rawq, m); 1350 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1351 softintr_schedule(sc->sc_si); 1352 #else 1353 schednetisr(NETISR_PPP); 1354 #endif 1355 splx(s); 1356 } 1357 1358 /* 1359 * Process a received PPP packet, doing decompression as necessary. 1360 * Should be called at splsoftnet. 1361 */ 1362 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1363 TYPE_UNCOMPRESSED_TCP) 1364 1365 static void 1366 ppp_inproc(sc, m) 1367 struct ppp_softc *sc; 1368 struct mbuf *m; 1369 { 1370 struct ifnet *ifp = &sc->sc_if; 1371 struct ifqueue *inq; 1372 int s, ilen, proto, rv; 1373 u_char *cp, adrs, ctrl; 1374 struct mbuf *mp, *dmp = NULL; 1375 #ifdef VJC 1376 int xlen; 1377 u_char *iphdr; 1378 u_int hlen; 1379 #endif 1380 1381 sc->sc_stats.ppp_ipackets++; 1382 1383 if (sc->sc_flags & SC_LOG_INPKT) { 1384 ilen = 0; 1385 for (mp = m; mp != NULL; mp = mp->m_next) 1386 ilen += mp->m_len; 1387 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1388 pppdumpm(m); 1389 } 1390 1391 cp = mtod(m, u_char *); 1392 adrs = PPP_ADDRESS(cp); 1393 ctrl = PPP_CONTROL(cp); 1394 proto = PPP_PROTOCOL(cp); 1395 1396 if (m->m_flags & M_ERRMARK) { 1397 m->m_flags &= ~M_ERRMARK; 1398 s = splhigh(); /* XXX IMP ME HARDER */ 1399 sc->sc_flags |= SC_VJ_RESET; 1400 splx(s); 1401 } 1402 1403 #ifdef PPP_COMPRESS 1404 /* 1405 * Decompress this packet if necessary, update the receiver's 1406 * dictionary, or take appropriate action on a CCP packet. 1407 */ 1408 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1409 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1410 /* decompress this packet */ 1411 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1412 if (rv == DECOMP_OK) { 1413 m_freem(m); 1414 if (dmp == NULL) { 1415 /* no error, but no decompressed packet produced */ 1416 return; 1417 } 1418 m = dmp; 1419 cp = mtod(m, u_char *); 1420 proto = PPP_PROTOCOL(cp); 1421 1422 } else { 1423 /* 1424 * An error has occurred in decompression. 1425 * Pass the compressed packet up to pppd, which may take 1426 * CCP down or issue a Reset-Req. 1427 */ 1428 if (sc->sc_flags & SC_DEBUG) 1429 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1430 s = splhigh(); /* XXX IMP ME HARDER */ 1431 sc->sc_flags |= SC_VJ_RESET; 1432 if (rv == DECOMP_ERROR) 1433 sc->sc_flags |= SC_DC_ERROR; 1434 else 1435 sc->sc_flags |= SC_DC_FERROR; 1436 splx(s); 1437 } 1438 1439 } else { 1440 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1441 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1442 } 1443 if (proto == PPP_CCP) { 1444 ppp_ccp(sc, m, 1); 1445 } 1446 } 1447 #endif 1448 1449 ilen = 0; 1450 for (mp = m; mp != NULL; mp = mp->m_next) 1451 ilen += mp->m_len; 1452 1453 #ifdef VJC 1454 if (sc->sc_flags & SC_VJ_RESET) { 1455 /* 1456 * If we've missed a packet, we must toss subsequent compressed 1457 * packets which don't have an explicit connection ID. 1458 */ 1459 if (sc->sc_comp) 1460 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1461 s = splhigh(); /* XXX IMP ME HARDER */ 1462 sc->sc_flags &= ~SC_VJ_RESET; 1463 splx(s); 1464 } 1465 1466 /* 1467 * See if we have a VJ-compressed packet to uncompress. 1468 */ 1469 if (proto == PPP_VJC_COMP) { 1470 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1471 goto bad; 1472 1473 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1474 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1475 sc->sc_comp, &iphdr, &hlen); 1476 1477 if (xlen <= 0) { 1478 if (sc->sc_flags & SC_DEBUG) 1479 printf("%s: VJ uncompress failed on type comp\n", 1480 ifp->if_xname); 1481 goto bad; 1482 } 1483 1484 /* Copy the PPP and IP headers into a new mbuf. */ 1485 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1486 if (mp == NULL) 1487 goto bad; 1488 mp->m_len = 0; 1489 mp->m_next = NULL; 1490 if (hlen + PPP_HDRLEN > MHLEN) { 1491 MCLGET(mp, M_DONTWAIT); 1492 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1493 m_freem(mp); 1494 goto bad; /* lose if big headers and no clusters */ 1495 } 1496 } 1497 cp = mtod(mp, u_char *); 1498 cp[0] = adrs; 1499 cp[1] = ctrl; 1500 cp[2] = 0; 1501 cp[3] = PPP_IP; 1502 proto = PPP_IP; 1503 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1504 mp->m_len = hlen + PPP_HDRLEN; 1505 1506 /* 1507 * Trim the PPP and VJ headers off the old mbuf 1508 * and stick the new and old mbufs together. 1509 */ 1510 m->m_data += PPP_HDRLEN + xlen; 1511 m->m_len -= PPP_HDRLEN + xlen; 1512 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1513 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1514 mp->m_len += m->m_len; 1515 MFREE(m, mp->m_next); 1516 } else 1517 mp->m_next = m; 1518 m = mp; 1519 ilen += hlen - xlen; 1520 1521 } else if (proto == PPP_VJC_UNCOMP) { 1522 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1523 goto bad; 1524 1525 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1526 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1527 sc->sc_comp, &iphdr, &hlen); 1528 1529 if (xlen < 0) { 1530 if (sc->sc_flags & SC_DEBUG) 1531 printf("%s: VJ uncompress failed on type uncomp\n", 1532 ifp->if_xname); 1533 goto bad; 1534 } 1535 1536 proto = PPP_IP; 1537 cp[3] = PPP_IP; 1538 } 1539 #endif /* VJC */ 1540 1541 /* 1542 * If the packet will fit in a header mbuf, don't waste a 1543 * whole cluster on it. 1544 */ 1545 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1546 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1547 if (mp != NULL) { 1548 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1549 m_freem(m); 1550 m = mp; 1551 m->m_len = ilen; 1552 } 1553 } 1554 m->m_pkthdr.len = ilen; 1555 m->m_pkthdr.rcvif = ifp; 1556 1557 if ((proto & 0x8000) == 0) { 1558 #ifdef PPP_FILTER 1559 /* 1560 * See whether we want to pass this packet, and 1561 * if it counts as link activity. 1562 */ 1563 if (sc->sc_pass_filt_in.bf_insns != 0 1564 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1565 ilen, 0) == 0) { 1566 /* drop this packet */ 1567 m_freem(m); 1568 return; 1569 } 1570 if (sc->sc_active_filt_in.bf_insns == 0 1571 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1572 ilen, 0)) 1573 sc->sc_last_recv = time.tv_sec; 1574 #else 1575 /* 1576 * Record the time that we received this packet. 1577 */ 1578 sc->sc_last_recv = time.tv_sec; 1579 #endif /* PPP_FILTER */ 1580 } 1581 1582 #if NBPFILTER > 0 1583 /* See if bpf wants to look at the packet. */ 1584 if (sc->sc_if.if_bpf) 1585 bpf_mtap(sc->sc_if.if_bpf, m); 1586 #endif 1587 1588 rv = 0; 1589 switch (proto) { 1590 #ifdef INET 1591 case PPP_IP: 1592 /* 1593 * IP packet - take off the ppp header and pass it up to IP. 1594 */ 1595 if ((ifp->if_flags & IFF_UP) == 0 1596 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1597 /* interface is down - drop the packet. */ 1598 m_freem(m); 1599 return; 1600 } 1601 m->m_pkthdr.len -= PPP_HDRLEN; 1602 m->m_data += PPP_HDRLEN; 1603 m->m_len -= PPP_HDRLEN; 1604 #ifdef GATEWAY 1605 if (ipflow_fastforward(m)) 1606 return; 1607 #endif 1608 schednetisr(NETISR_IP); 1609 inq = &ipintrq; 1610 break; 1611 #endif 1612 1613 #ifdef INET6 1614 case PPP_IPV6: 1615 /* 1616 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1617 */ 1618 if ((ifp->if_flags & IFF_UP) == 0 1619 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1620 /* interface is down - drop the packet. */ 1621 m_freem(m); 1622 return; 1623 } 1624 m->m_pkthdr.len -= PPP_HDRLEN; 1625 m->m_data += PPP_HDRLEN; 1626 m->m_len -= PPP_HDRLEN; 1627 schednetisr(NETISR_IPV6); 1628 inq = &ip6intrq; 1629 break; 1630 #endif 1631 1632 default: 1633 /* 1634 * Some other protocol - place on input queue for read(). 1635 */ 1636 inq = &sc->sc_inq; 1637 rv = 1; 1638 break; 1639 } 1640 1641 /* 1642 * Put the packet on the appropriate input queue. 1643 */ 1644 s = splnet(); 1645 if (IF_QFULL(inq)) { 1646 IF_DROP(inq); 1647 splx(s); 1648 if (sc->sc_flags & SC_DEBUG) 1649 printf("%s: input queue full\n", ifp->if_xname); 1650 ifp->if_iqdrops++; 1651 goto bad; 1652 } 1653 IF_ENQUEUE(inq, m); 1654 splx(s); 1655 ifp->if_ipackets++; 1656 ifp->if_ibytes += ilen; 1657 1658 if (rv) 1659 (*sc->sc_ctlp)(sc); 1660 1661 return; 1662 1663 bad: 1664 m_freem(m); 1665 sc->sc_if.if_ierrors++; 1666 sc->sc_stats.ppp_ierrors++; 1667 } 1668 1669 #define MAX_DUMP_BYTES 128 1670 1671 static void 1672 pppdumpm(m0) 1673 struct mbuf *m0; 1674 { 1675 char buf[3*MAX_DUMP_BYTES+4]; 1676 char *bp = buf; 1677 struct mbuf *m; 1678 static char digits[] = "0123456789abcdef"; 1679 1680 for (m = m0; m; m = m->m_next) { 1681 int l = m->m_len; 1682 u_char *rptr = (u_char *)m->m_data; 1683 1684 while (l--) { 1685 if (bp > buf + sizeof(buf) - 4) 1686 goto done; 1687 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1688 *bp++ = digits[*rptr++ & 0xf]; 1689 } 1690 1691 if (m->m_next) { 1692 if (bp > buf + sizeof(buf) - 3) 1693 goto done; 1694 *bp++ = '|'; 1695 } else 1696 *bp++ = ' '; 1697 } 1698 done: 1699 if (m) 1700 *bp++ = '>'; 1701 *bp = 0; 1702 printf("%s\n", buf); 1703 } 1704 1705 #ifdef ALTQ 1706 /* 1707 * a wrapper to transmit a packet from if_start since ALTQ uses 1708 * if_start to send a packet. 1709 */ 1710 static void 1711 ppp_ifstart(ifp) 1712 struct ifnet *ifp; 1713 { 1714 struct ppp_softc *sc; 1715 1716 sc = ifp->if_softc; 1717 (*sc->sc_start)(sc); 1718 } 1719 #endif 1720