if_ppp.c revision 1.79
1 /* $NetBSD: if_ppp.c,v 1.79 2002/09/25 16:10:15 darrenr 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) 1984-2000 Carnegie Mellon University. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The name "Carnegie Mellon University" must not be used to 22 * endorse or promote products derived from this software without 23 * prior written permission. For permission or any legal 24 * details, please contact 25 * Office of Technology Transfer 26 * Carnegie Mellon University 27 * 5000 Forbes Avenue 28 * Pittsburgh, PA 15213-3890 29 * (412) 268-4387, fax: (412) 268-7395 30 * tech-transfer (at) andrew.cmu.edu 31 * 32 * 4. Redistributions of any form whatsoever must retain the following 33 * acknowledgment: 34 * "This product includes software developed by Computing Services 35 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 36 * 37 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 38 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 39 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 40 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 42 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 43 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 44 * 45 * Based on: 46 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 47 * 48 * Copyright (c) 1987 Regents of the University of California. 49 * All rights reserved. 50 * 51 * Redistribution and use in source and binary forms are permitted 52 * provided that the above copyright notice and this paragraph are 53 * duplicated in all such forms and that any documentation, 54 * advertising materials, and other materials related to such 55 * distribution and use acknowledge that the software was developed 56 * by the University of California, Berkeley. The name of the 57 * University may not be used to endorse or promote products derived 58 * from this software without specific prior written permission. 59 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 61 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 62 * 63 * Serial Line interface 64 * 65 * Rick Adams 66 * Center for Seismic Studies 67 * 1300 N 17th Street, Suite 1450 68 * Arlington, Virginia 22209 69 * (703)276-7900 70 * rick (at) seismo.ARPA 71 * seismo!rick 72 * 73 * Pounded on heavily by Chris Torek (chris (at) mimsy.umd.edu, umcp-cs!chris). 74 * Converted to 4.3BSD Beta by Chris Torek. 75 * Other changes made at Berkeley, based in part on code by Kirk Smith. 76 * 77 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad (at) cayman.com) 78 * Added VJ tcp header compression; more unified ioctls 79 * 80 * Extensively modified by Paul Mackerras (paulus (at) cs.anu.edu.au). 81 * Cleaned up a lot of the mbuf-related code to fix bugs that 82 * caused system crashes and packet corruption. Changed pppstart 83 * so that it doesn't just give up with a collision if the whole 84 * packet doesn't fit in the output ring buffer. 85 * 86 * Added priority queueing for interactive IP packets, following 87 * the model of if_sl.c, plus hooks for bpf. 88 * Paul Mackerras (paulus (at) cs.anu.edu.au). 89 */ 90 91 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 92 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 93 94 /* 95 * XXX IMP ME HARDER 96 * 97 * This is an explanation of that comment. This code used to use 98 * splimp() to block both network and tty interrupts. However, 99 * that call is deprecated. So, we have replaced the uses of 100 * splimp() with splhigh() in order to applomplish what it needs 101 * to accomplish, and added that happy little comment. 102 */ 103 104 #include <sys/cdefs.h> 105 __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.79 2002/09/25 16:10:15 darrenr Exp $"); 106 107 #include "ppp.h" 108 109 #include "opt_inet.h" 110 #include "opt_gateway.h" 111 #include "opt_ppp.h" 112 113 #ifdef INET 114 #define VJC 115 #endif 116 #define PPP_COMPRESS 117 118 #include <sys/param.h> 119 #include <sys/proc.h> 120 #include <sys/mbuf.h> 121 #include <sys/socket.h> 122 #include <sys/ioctl.h> 123 #include <sys/kernel.h> 124 #include <sys/systm.h> 125 #include <sys/time.h> 126 #include <sys/malloc.h> 127 128 #include <net/if.h> 129 #include <net/if_types.h> 130 #include <net/netisr.h> 131 #include <net/route.h> 132 #ifdef PPP_FILTER 133 #include <net/bpf.h> 134 #endif 135 136 #include <machine/intr.h> 137 138 #include <netinet/in.h> 139 #include <netinet/in_systm.h> 140 #include <netinet/in_var.h> 141 #ifdef INET 142 #include <netinet/ip.h> 143 #endif 144 145 #include "bpfilter.h" 146 #if NBPFILTER > 0 147 #include <sys/time.h> 148 #include <net/bpf.h> 149 #endif 150 151 #if defined(PPP_FILTER) || NBPFILTER > 0 152 #include <net/slip.h> 153 #endif 154 155 #ifdef VJC 156 #include <net/slcompress.h> 157 #endif 158 159 #include <net/ppp_defs.h> 160 #include <net/if_ppp.h> 161 #include <net/if_pppvar.h> 162 #include <machine/cpu.h> 163 164 #ifdef PPP_COMPRESS 165 #define PACKETPTR struct mbuf * 166 #include <net/ppp-comp.h> 167 #endif 168 169 static int pppsioctl __P((struct ifnet *, u_long, caddr_t)); 170 static void ppp_requeue __P((struct ppp_softc *)); 171 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); 172 static void ppp_ccp_closed __P((struct ppp_softc *)); 173 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); 174 static void pppdumpm __P((struct mbuf *m0)); 175 #ifdef ALTQ 176 static void ppp_ifstart __P((struct ifnet *ifp)); 177 #endif 178 179 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 180 void pppnetisr(void); 181 #endif 182 void pppintr(void *); 183 184 /* 185 * Some useful mbuf macros not in mbuf.h. 186 */ 187 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 188 189 #define M_DATASTART(m) \ 190 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 191 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 192 193 #define M_DATASIZE(m) \ 194 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 195 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 196 197 /* 198 * We define two link layer specific mbuf flags, to mark high-priority 199 * packets for output, and received packets following lost/corrupted 200 * packets. 201 */ 202 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 203 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 204 205 struct ppp_softc ppp_softc[NPPP]; 206 207 #ifdef PPP_COMPRESS 208 /* 209 * List of compressors we know about. 210 * We leave some space so maybe we can modload compressors. 211 */ 212 213 extern struct compressor ppp_bsd_compress; 214 extern struct compressor ppp_deflate, ppp_deflate_draft; 215 216 struct compressor *ppp_compressors[8] = { 217 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 218 &ppp_bsd_compress, 219 #endif 220 #if DO_DEFLATE && defined(PPP_DEFLATE) 221 &ppp_deflate, 222 &ppp_deflate_draft, 223 #endif 224 NULL 225 }; 226 #endif /* PPP_COMPRESS */ 227 228 229 /* 230 * Called from boot code to establish ppp interfaces. 231 */ 232 void 233 pppattach() 234 { 235 struct ppp_softc *sc; 236 int i = 0; 237 238 for (sc = ppp_softc; i < NPPP; sc++) { 239 sc->sc_unit = i; /* XXX */ 240 sprintf(sc->sc_if.if_xname, "ppp%d", i++); 241 callout_init(&sc->sc_timo_ch); 242 sc->sc_if.if_softc = sc; 243 sc->sc_if.if_mtu = PPP_MTU; 244 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 245 sc->sc_if.if_type = IFT_PPP; 246 sc->sc_if.if_hdrlen = PPP_HDRLEN; 247 sc->sc_if.if_dlt = DLT_NULL; 248 sc->sc_if.if_ioctl = pppsioctl; 249 sc->sc_if.if_output = pppoutput; 250 #ifdef ALTQ 251 sc->sc_if.if_start = ppp_ifstart; 252 #endif 253 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 254 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 255 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 256 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 257 IFQ_SET_READY(&sc->sc_if.if_snd); 258 if_attach(&sc->sc_if); 259 if_alloc_sadl(&sc->sc_if); 260 #if NBPFILTER > 0 261 bpfattach(&sc->sc_if, DLT_NULL, 0); 262 #endif 263 } 264 } 265 266 /* 267 * Allocate a ppp interface unit and initialize it. 268 */ 269 struct ppp_softc * 270 pppalloc(pid) 271 pid_t pid; 272 { 273 int nppp, i; 274 struct ppp_softc *sc; 275 276 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 277 if (sc->sc_xfer == pid) { 278 sc->sc_xfer = 0; 279 return sc; 280 } 281 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) 282 if (sc->sc_devp == NULL) 283 break; 284 if (nppp >= NPPP) 285 return NULL; 286 287 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 288 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 289 if (sc->sc_si == NULL) { 290 printf("ppp%d: unable to establish softintr\n", sc->sc_unit); 291 return (NULL); 292 } 293 #endif 294 295 sc->sc_flags = 0; 296 sc->sc_mru = PPP_MRU; 297 sc->sc_relinq = NULL; 298 memset((char *)&sc->sc_stats, 0, sizeof(sc->sc_stats)); 299 #ifdef VJC 300 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 301 M_DEVBUF, M_NOWAIT); 302 if (sc->sc_comp) 303 sl_compress_init(sc->sc_comp); 304 #endif 305 #ifdef PPP_COMPRESS 306 sc->sc_xc_state = NULL; 307 sc->sc_rc_state = NULL; 308 #endif /* PPP_COMPRESS */ 309 for (i = 0; i < NUM_NP; ++i) 310 sc->sc_npmode[i] = NPMODE_ERROR; 311 sc->sc_npqueue = NULL; 312 sc->sc_npqtail = &sc->sc_npqueue; 313 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; 314 315 return sc; 316 } 317 318 /* 319 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 320 */ 321 void 322 pppdealloc(sc) 323 struct ppp_softc *sc; 324 { 325 struct mbuf *m; 326 327 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 328 softintr_disestablish(sc->sc_si); 329 #endif 330 if_down(&sc->sc_if); 331 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 332 sc->sc_devp = NULL; 333 sc->sc_xfer = 0; 334 for (;;) { 335 IF_DEQUEUE(&sc->sc_rawq, m); 336 if (m == NULL) 337 break; 338 m_freem(m); 339 } 340 for (;;) { 341 IF_DEQUEUE(&sc->sc_inq, m); 342 if (m == NULL) 343 break; 344 m_freem(m); 345 } 346 for (;;) { 347 IF_DEQUEUE(&sc->sc_fastq, m); 348 if (m == NULL) 349 break; 350 m_freem(m); 351 } 352 while ((m = sc->sc_npqueue) != NULL) { 353 sc->sc_npqueue = m->m_nextpkt; 354 m_freem(m); 355 } 356 if (sc->sc_togo != NULL) { 357 m_freem(sc->sc_togo); 358 sc->sc_togo = NULL; 359 } 360 #ifdef PPP_COMPRESS 361 ppp_ccp_closed(sc); 362 sc->sc_xc_state = NULL; 363 sc->sc_rc_state = NULL; 364 #endif /* PPP_COMPRESS */ 365 #ifdef PPP_FILTER 366 if (sc->sc_pass_filt_in.bf_insns != 0) { 367 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 368 sc->sc_pass_filt_in.bf_insns = 0; 369 sc->sc_pass_filt_in.bf_len = 0; 370 } 371 if (sc->sc_pass_filt_out.bf_insns != 0) { 372 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 373 sc->sc_pass_filt_out.bf_insns = 0; 374 sc->sc_pass_filt_out.bf_len = 0; 375 } 376 if (sc->sc_active_filt_in.bf_insns != 0) { 377 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 378 sc->sc_active_filt_in.bf_insns = 0; 379 sc->sc_active_filt_in.bf_len = 0; 380 } 381 if (sc->sc_active_filt_out.bf_insns != 0) { 382 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 383 sc->sc_active_filt_out.bf_insns = 0; 384 sc->sc_active_filt_out.bf_len = 0; 385 } 386 #endif /* PPP_FILTER */ 387 #ifdef VJC 388 if (sc->sc_comp != 0) { 389 FREE(sc->sc_comp, M_DEVBUF); 390 sc->sc_comp = 0; 391 } 392 #endif 393 } 394 395 /* 396 * Ioctl routine for generic ppp devices. 397 */ 398 int 399 pppioctl(sc, cmd, data, flag, p) 400 struct ppp_softc *sc; 401 u_long cmd; 402 caddr_t data; 403 int flag; 404 struct proc *p; 405 { 406 int s, error, flags, mru, npx; 407 u_int nb; 408 struct ppp_option_data *odp; 409 struct compressor **cp; 410 struct npioctl *npi; 411 time_t t; 412 #ifdef PPP_FILTER 413 struct bpf_program *bp, *nbp; 414 struct bpf_insn *newcode, *oldcode; 415 int newcodelen; 416 #endif /* PPP_FILTER */ 417 #ifdef PPP_COMPRESS 418 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 419 #endif 420 421 switch (cmd) { 422 case FIONREAD: 423 *(int *)data = sc->sc_inq.ifq_len; 424 break; 425 426 case PPPIOCGUNIT: 427 *(int *)data = sc->sc_unit; /* XXX */ 428 break; 429 430 case PPPIOCGFLAGS: 431 *(u_int *)data = sc->sc_flags; 432 break; 433 434 case PPPIOCSFLAGS: 435 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 436 return (error); 437 flags = *(int *)data & SC_MASK; 438 s = splsoftnet(); 439 #ifdef PPP_COMPRESS 440 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 441 ppp_ccp_closed(sc); 442 #endif 443 splhigh(); /* XXX IMP ME HARDER */ 444 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 445 splx(s); 446 break; 447 448 case PPPIOCSMRU: 449 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 450 return (error); 451 mru = *(int *)data; 452 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 453 sc->sc_mru = mru; 454 break; 455 456 case PPPIOCGMRU: 457 *(int *)data = sc->sc_mru; 458 break; 459 460 #ifdef VJC 461 case PPPIOCSMAXCID: 462 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 463 return (error); 464 if (sc->sc_comp) { 465 s = splsoftnet(); 466 sl_compress_setup(sc->sc_comp, *(int *)data); 467 splx(s); 468 } 469 break; 470 #endif 471 472 case PPPIOCXFERUNIT: 473 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 474 return (error); 475 sc->sc_xfer = p->p_pid; 476 break; 477 478 #ifdef PPP_COMPRESS 479 case PPPIOCSCOMPRESS: 480 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 481 return (error); 482 odp = (struct ppp_option_data *) data; 483 nb = odp->length; 484 if (nb > sizeof(ccp_option)) 485 nb = sizeof(ccp_option); 486 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 487 return (error); 488 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 489 return (EINVAL); 490 for (cp = ppp_compressors; *cp != NULL; ++cp) 491 if ((*cp)->compress_proto == ccp_option[0]) { 492 /* 493 * Found a handler for the protocol - try to allocate 494 * a compressor or decompressor. 495 */ 496 error = 0; 497 if (odp->transmit) { 498 s = splsoftnet(); 499 if (sc->sc_xc_state != NULL) 500 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 501 sc->sc_xcomp = *cp; 502 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 503 if (sc->sc_xc_state == NULL) { 504 if (sc->sc_flags & SC_DEBUG) 505 printf("%s: comp_alloc failed\n", 506 sc->sc_if.if_xname); 507 error = ENOBUFS; 508 } 509 splhigh(); /* XXX IMP ME HARDER */ 510 sc->sc_flags &= ~SC_COMP_RUN; 511 splx(s); 512 } else { 513 s = splsoftnet(); 514 if (sc->sc_rc_state != NULL) 515 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 516 sc->sc_rcomp = *cp; 517 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 518 if (sc->sc_rc_state == NULL) { 519 if (sc->sc_flags & SC_DEBUG) 520 printf("%s: decomp_alloc failed\n", 521 sc->sc_if.if_xname); 522 error = ENOBUFS; 523 } 524 splhigh(); /* XXX IMP ME HARDER */ 525 sc->sc_flags &= ~SC_DECOMP_RUN; 526 splx(s); 527 } 528 return (error); 529 } 530 if (sc->sc_flags & SC_DEBUG) 531 printf("%s: no compressor for [%x %x %x], %x\n", 532 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 533 ccp_option[2], nb); 534 return (EINVAL); /* no handler found */ 535 #endif /* PPP_COMPRESS */ 536 537 case PPPIOCGNPMODE: 538 case PPPIOCSNPMODE: 539 npi = (struct npioctl *) data; 540 switch (npi->protocol) { 541 case PPP_IP: 542 npx = NP_IP; 543 break; 544 case PPP_IPV6: 545 npx = NP_IPV6; 546 break; 547 default: 548 return EINVAL; 549 } 550 if (cmd == PPPIOCGNPMODE) { 551 npi->mode = sc->sc_npmode[npx]; 552 } else { 553 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 554 return (error); 555 if (npi->mode != sc->sc_npmode[npx]) { 556 s = splnet(); 557 sc->sc_npmode[npx] = npi->mode; 558 if (npi->mode != NPMODE_QUEUE) { 559 ppp_requeue(sc); 560 ppp_restart(sc); 561 } 562 splx(s); 563 } 564 } 565 break; 566 567 case PPPIOCGIDLE: 568 s = splsoftnet(); 569 t = time.tv_sec; 570 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 571 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 572 splx(s); 573 break; 574 575 #ifdef PPP_FILTER 576 case PPPIOCSPASS: 577 case PPPIOCSACTIVE: 578 /* These are no longer supported. */ 579 return EOPNOTSUPP; 580 581 case PPPIOCSIPASS: 582 case PPPIOCSOPASS: 583 case PPPIOCSIACTIVE: 584 case PPPIOCSOACTIVE: 585 nbp = (struct bpf_program *) data; 586 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 587 return EINVAL; 588 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 589 if (newcodelen != 0) { 590 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 591 /* WAITOK -- malloc() never fails. */ 592 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 593 newcodelen)) != 0) { 594 free(newcode, M_DEVBUF); 595 return error; 596 } 597 if (!bpf_validate(newcode, nbp->bf_len)) { 598 free(newcode, M_DEVBUF); 599 return EINVAL; 600 } 601 } else 602 newcode = 0; 603 switch (cmd) { 604 case PPPIOCSIPASS: 605 bp = &sc->sc_pass_filt_in; 606 break; 607 608 case PPPIOCSOPASS: 609 bp = &sc->sc_pass_filt_out; 610 break; 611 612 case PPPIOCSIACTIVE: 613 bp = &sc->sc_active_filt_in; 614 break; 615 616 case PPPIOCSOACTIVE: 617 bp = &sc->sc_active_filt_out; 618 break; 619 } 620 oldcode = bp->bf_insns; 621 s = splnet(); 622 bp->bf_len = nbp->bf_len; 623 bp->bf_insns = newcode; 624 splx(s); 625 if (oldcode != 0) 626 free(oldcode, M_DEVBUF); 627 break; 628 #endif /* PPP_FILTER */ 629 630 default: 631 return (EPASSTHROUGH); 632 } 633 return (0); 634 } 635 636 /* 637 * Process an ioctl request to the ppp network interface. 638 */ 639 static int 640 pppsioctl(ifp, cmd, data) 641 struct ifnet *ifp; 642 u_long cmd; 643 caddr_t data; 644 { 645 struct proc *p = curproc; /* XXX */ 646 struct ppp_softc *sc = ifp->if_softc; 647 struct ifaddr *ifa = (struct ifaddr *)data; 648 struct ifreq *ifr = (struct ifreq *)data; 649 struct ppp_stats *psp; 650 #ifdef PPP_COMPRESS 651 struct ppp_comp_stats *pcp; 652 #endif 653 int s = splnet(), error = 0; 654 655 switch (cmd) { 656 case SIOCSIFFLAGS: 657 if ((ifp->if_flags & IFF_RUNNING) == 0) 658 ifp->if_flags &= ~IFF_UP; 659 break; 660 661 case SIOCSIFADDR: 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 SIOCSIFDSTADDR: 678 switch (ifa->ifa_addr->sa_family) { 679 #ifdef INET 680 case AF_INET: 681 break; 682 #endif 683 #ifdef INET6 684 case AF_INET6: 685 break; 686 #endif 687 default: 688 error = EAFNOSUPPORT; 689 break; 690 } 691 break; 692 693 case SIOCSIFMTU: 694 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 695 break; 696 sc->sc_if.if_mtu = ifr->ifr_mtu; 697 break; 698 699 case SIOCGIFMTU: 700 ifr->ifr_mtu = sc->sc_if.if_mtu; 701 break; 702 703 case SIOCADDMULTI: 704 case SIOCDELMULTI: 705 if (ifr == 0) { 706 error = EAFNOSUPPORT; 707 break; 708 } 709 switch(ifr->ifr_addr.sa_family) { 710 #ifdef INET 711 case AF_INET: 712 break; 713 #endif 714 #ifdef INET6 715 case AF_INET6: 716 break; 717 #endif 718 default: 719 error = EAFNOSUPPORT; 720 break; 721 } 722 break; 723 724 case SIOCGPPPSTATS: 725 psp = &((struct ifpppstatsreq *) data)->stats; 726 memset(psp, 0, sizeof(*psp)); 727 psp->p = sc->sc_stats; 728 #if defined(VJC) && !defined(SL_NO_STATS) 729 if (sc->sc_comp) { 730 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 731 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 732 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 733 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 734 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 735 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 736 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 737 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 738 } 739 #endif /* VJC */ 740 break; 741 742 #ifdef PPP_COMPRESS 743 case SIOCGPPPCSTATS: 744 pcp = &((struct ifpppcstatsreq *) data)->stats; 745 memset(pcp, 0, sizeof(*pcp)); 746 if (sc->sc_xc_state != NULL) 747 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 748 if (sc->sc_rc_state != NULL) 749 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 750 break; 751 #endif /* PPP_COMPRESS */ 752 753 default: 754 error = EINVAL; 755 } 756 splx(s); 757 return (error); 758 } 759 760 /* 761 * Queue a packet. Start transmission if not active. 762 * Packet is placed in Information field of PPP frame. 763 */ 764 int 765 pppoutput(ifp, m0, dst, rtp) 766 struct ifnet *ifp; 767 struct mbuf *m0; 768 struct sockaddr *dst; 769 struct rtentry *rtp; 770 { 771 struct ppp_softc *sc = ifp->if_softc; 772 int protocol, address, control; 773 u_char *cp; 774 int s, error; 775 #ifdef INET 776 struct ip *ip; 777 #endif 778 struct ifqueue *ifq; 779 enum NPmode mode; 780 int len; 781 struct mbuf *m; 782 ALTQ_DECL(struct altq_pktattr pktattr;) 783 784 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 785 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 786 error = ENETDOWN; /* sort of */ 787 goto bad; 788 } 789 790 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 791 792 /* 793 * Compute PPP header. 794 */ 795 m0->m_flags &= ~M_HIGHPRI; 796 switch (dst->sa_family) { 797 #ifdef INET 798 case AF_INET: 799 address = PPP_ALLSTATIONS; 800 control = PPP_UI; 801 protocol = PPP_IP; 802 mode = sc->sc_npmode[NP_IP]; 803 804 /* 805 * If this packet has the "low delay" bit set in the IP header, 806 * put it on the fastq instead. 807 */ 808 ip = mtod(m0, struct ip *); 809 if (ip->ip_tos & IPTOS_LOWDELAY) 810 m0->m_flags |= M_HIGHPRI; 811 break; 812 #endif 813 #ifdef INET6 814 case AF_INET6: 815 address = PPP_ALLSTATIONS; /*XXX*/ 816 control = PPP_UI; /*XXX*/ 817 protocol = PPP_IPV6; 818 mode = sc->sc_npmode[NP_IPV6]; 819 820 #if 0 /* XXX flowinfo/traffic class, maybe? */ 821 /* 822 * If this packet has the "low delay" bit set in the IP header, 823 * put it on the fastq instead. 824 */ 825 ip = mtod(m0, struct ip *); 826 if (ip->ip_tos & IPTOS_LOWDELAY) 827 m0->m_flags |= M_HIGHPRI; 828 #endif 829 break; 830 #endif 831 case AF_UNSPEC: 832 address = PPP_ADDRESS(dst->sa_data); 833 control = PPP_CONTROL(dst->sa_data); 834 protocol = PPP_PROTOCOL(dst->sa_data); 835 mode = NPMODE_PASS; 836 break; 837 default: 838 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 839 error = EAFNOSUPPORT; 840 goto bad; 841 } 842 843 /* 844 * Drop this packet, or return an error, if necessary. 845 */ 846 if (mode == NPMODE_ERROR) { 847 error = ENETDOWN; 848 goto bad; 849 } 850 if (mode == NPMODE_DROP) { 851 error = 0; 852 goto bad; 853 } 854 855 /* 856 * Add PPP header. If no space in first mbuf, allocate another. 857 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 858 */ 859 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 860 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 861 if (m0 == 0) { 862 error = ENOBUFS; 863 goto bad; 864 } 865 m0->m_len = 0; 866 } else 867 m0->m_data -= PPP_HDRLEN; 868 869 cp = mtod(m0, u_char *); 870 *cp++ = address; 871 *cp++ = control; 872 *cp++ = protocol >> 8; 873 *cp++ = protocol & 0xff; 874 m0->m_len += PPP_HDRLEN; 875 m0->m_pkthdr.len += PPP_HDRLEN; 876 len = m0->m_pkthdr.len; 877 878 if (sc->sc_flags & SC_LOG_OUTPKT) { 879 printf("%s output: ", ifp->if_xname); 880 pppdumpm(m0); 881 } 882 883 if ((protocol & 0x8000) == 0) { 884 #ifdef PPP_FILTER 885 /* 886 * Apply the pass and active filters to the packet, 887 * but only if it is a data packet. 888 */ 889 if (sc->sc_pass_filt_out.bf_insns != 0 890 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 891 len, 0) == 0) { 892 error = 0; /* drop this packet */ 893 goto bad; 894 } 895 896 /* 897 * Update the time we sent the most recent packet. 898 */ 899 if (sc->sc_active_filt_out.bf_insns == 0 900 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 901 len, 0)) 902 sc->sc_last_sent = time.tv_sec; 903 #else 904 /* 905 * Update the time we sent the most recent packet. 906 */ 907 sc->sc_last_sent = time.tv_sec; 908 #endif /* PPP_FILTER */ 909 } 910 911 #if NBPFILTER > 0 912 /* 913 * See if bpf wants to look at the packet. 914 */ 915 if (sc->sc_if.if_bpf) 916 bpf_mtap(sc->sc_if.if_bpf, m0); 917 #endif 918 919 /* 920 * Put the packet on the appropriate queue. 921 */ 922 s = splnet(); 923 if (mode == NPMODE_QUEUE) { 924 /* XXX we should limit the number of packets on this queue */ 925 *sc->sc_npqtail = m0; 926 m0->m_nextpkt = NULL; 927 sc->sc_npqtail = &m0->m_nextpkt; 928 } else { 929 if ((m0->m_flags & M_HIGHPRI) 930 #ifdef ALTQ 931 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 932 #endif 933 ) { 934 ifq = &sc->sc_fastq; 935 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 936 IF_DROP(ifq); 937 splx(s); 938 error = ENOBUFS; 939 goto bad; 940 } else { 941 IF_ENQUEUE(ifq, m0); 942 error = 0; 943 } 944 } else 945 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 946 if (error) { 947 splx(s); 948 sc->sc_if.if_oerrors++; 949 sc->sc_stats.ppp_oerrors++; 950 return (error); 951 } 952 ppp_restart(sc); 953 } 954 ifp->if_opackets++; 955 ifp->if_obytes += len; 956 957 splx(s); 958 return (0); 959 960 bad: 961 m_freem(m0); 962 return (error); 963 } 964 965 /* 966 * After a change in the NPmode for some NP, move packets from the 967 * npqueue to the send queue or the fast queue as appropriate. 968 * Should be called at splnet, since we muck with the queues. 969 */ 970 static void 971 ppp_requeue(sc) 972 struct ppp_softc *sc; 973 { 974 struct mbuf *m, **mpp; 975 struct ifqueue *ifq; 976 enum NPmode mode; 977 int error; 978 979 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 980 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 981 case PPP_IP: 982 mode = sc->sc_npmode[NP_IP]; 983 break; 984 case PPP_IPV6: 985 mode = sc->sc_npmode[NP_IPV6]; 986 break; 987 default: 988 mode = NPMODE_PASS; 989 } 990 991 switch (mode) { 992 case NPMODE_PASS: 993 /* 994 * This packet can now go on one of the queues to be sent. 995 */ 996 *mpp = m->m_nextpkt; 997 m->m_nextpkt = NULL; 998 if ((m->m_flags & M_HIGHPRI) 999 #ifdef ALTQ 1000 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 1001 #endif 1002 ) { 1003 ifq = &sc->sc_fastq; 1004 if (IF_QFULL(ifq)) { 1005 IF_DROP(ifq); 1006 m_freem(m); 1007 error = ENOBUFS; 1008 } else { 1009 IF_ENQUEUE(ifq, m); 1010 error = 0; 1011 } 1012 } else 1013 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 1014 if (error) { 1015 sc->sc_if.if_oerrors++; 1016 sc->sc_stats.ppp_oerrors++; 1017 } 1018 break; 1019 1020 case NPMODE_DROP: 1021 case NPMODE_ERROR: 1022 *mpp = m->m_nextpkt; 1023 m_freem(m); 1024 break; 1025 1026 case NPMODE_QUEUE: 1027 mpp = &m->m_nextpkt; 1028 break; 1029 } 1030 } 1031 sc->sc_npqtail = mpp; 1032 } 1033 1034 /* 1035 * Transmitter has finished outputting some stuff; 1036 * remember to call sc->sc_start later at splsoftnet. 1037 */ 1038 void 1039 ppp_restart(sc) 1040 struct ppp_softc *sc; 1041 { 1042 int s = splhigh(); /* XXX IMP ME HARDER */ 1043 1044 sc->sc_flags &= ~SC_TBUSY; 1045 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1046 softintr_schedule(sc->sc_si); 1047 #else 1048 schednetisr(NETISR_PPP); 1049 #endif 1050 splx(s); 1051 } 1052 1053 /* 1054 * Get a packet to send. This procedure is intended to be called at 1055 * splsoftnet, since it may involve time-consuming operations such as 1056 * applying VJ compression, packet compression, address/control and/or 1057 * protocol field compression to the packet. 1058 */ 1059 struct mbuf * 1060 ppp_dequeue(sc) 1061 struct ppp_softc *sc; 1062 { 1063 struct mbuf *m, *mp; 1064 u_char *cp; 1065 int address, control, protocol; 1066 int s; 1067 1068 /* 1069 * Grab a packet to send: first try the fast queue, then the 1070 * normal queue. 1071 */ 1072 s = splnet(); 1073 IF_DEQUEUE(&sc->sc_fastq, m); 1074 if (m == NULL) 1075 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1076 splx(s); 1077 1078 if (m == NULL) 1079 return NULL; 1080 1081 ++sc->sc_stats.ppp_opackets; 1082 1083 /* 1084 * Extract the ppp header of the new packet. 1085 * The ppp header will be in one mbuf. 1086 */ 1087 cp = mtod(m, u_char *); 1088 address = PPP_ADDRESS(cp); 1089 control = PPP_CONTROL(cp); 1090 protocol = PPP_PROTOCOL(cp); 1091 1092 switch (protocol) { 1093 case PPP_IP: 1094 #ifdef VJC 1095 /* 1096 * If the packet is a TCP/IP packet, see if we can compress it. 1097 */ 1098 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1099 struct ip *ip; 1100 int type; 1101 1102 mp = m; 1103 ip = (struct ip *) (cp + PPP_HDRLEN); 1104 if (mp->m_len <= PPP_HDRLEN) { 1105 mp = mp->m_next; 1106 if (mp == NULL) 1107 break; 1108 ip = mtod(mp, struct ip *); 1109 } 1110 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1111 if (ip->ip_p == IPPROTO_TCP) { 1112 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1113 !(sc->sc_flags & SC_NO_TCP_CCID)); 1114 switch (type) { 1115 case TYPE_UNCOMPRESSED_TCP: 1116 protocol = PPP_VJC_UNCOMP; 1117 break; 1118 case TYPE_COMPRESSED_TCP: 1119 protocol = PPP_VJC_COMP; 1120 cp = mtod(m, u_char *); 1121 cp[0] = address; /* header has moved */ 1122 cp[1] = control; 1123 cp[2] = 0; 1124 break; 1125 } 1126 cp[3] = protocol; /* update protocol in PPP header */ 1127 } 1128 } 1129 #endif /* VJC */ 1130 break; 1131 1132 #ifdef PPP_COMPRESS 1133 case PPP_CCP: 1134 ppp_ccp(sc, m, 0); 1135 break; 1136 #endif /* PPP_COMPRESS */ 1137 } 1138 1139 #ifdef PPP_COMPRESS 1140 if (protocol != PPP_LCP && protocol != PPP_CCP 1141 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1142 struct mbuf *mcomp = NULL; 1143 int slen, clen; 1144 1145 slen = m->m_pkthdr.len; 1146 clen = (*sc->sc_xcomp->compress) 1147 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1148 if (mcomp != NULL) { 1149 if (sc->sc_flags & SC_CCP_UP) { 1150 /* Send the compressed packet instead of the original. */ 1151 m_freem(m); 1152 m = mcomp; 1153 cp = mtod(m, u_char *); 1154 protocol = cp[3]; 1155 } else { 1156 /* Can't transmit compressed packets until CCP is up. */ 1157 m_freem(mcomp); 1158 } 1159 } 1160 } 1161 #endif /* PPP_COMPRESS */ 1162 1163 /* 1164 * Compress the address/control and protocol, if possible. 1165 */ 1166 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1167 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1168 protocol != PPP_LCP) { 1169 /* can compress address/control */ 1170 m->m_data += 2; 1171 m->m_len -= 2; 1172 m->m_pkthdr.len -= 2; 1173 } 1174 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1175 /* can compress protocol */ 1176 if (mtod(m, u_char *) == cp) { 1177 cp[2] = cp[1]; /* move address/control up */ 1178 cp[1] = cp[0]; 1179 } 1180 m->m_data++; 1181 m->m_len--; 1182 m->m_pkthdr.len--; 1183 } 1184 1185 return m; 1186 } 1187 1188 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1189 void 1190 pppnetisr(void) 1191 { 1192 struct ppp_softc *sc; 1193 int i; 1194 1195 for (i = 0; i < NPPP; i++) { 1196 sc = &ppp_softc[i]; 1197 pppintr(sc); 1198 } 1199 } 1200 #endif 1201 1202 /* 1203 * Software interrupt routine, called at splsoftnet. 1204 */ 1205 void 1206 pppintr(void *arg) 1207 { 1208 struct ppp_softc *sc = arg; 1209 struct mbuf *m; 1210 int s; 1211 1212 if (!(sc->sc_flags & SC_TBUSY) 1213 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1214 || sc->sc_outm)) { 1215 s = splhigh(); /* XXX IMP ME HARDER */ 1216 sc->sc_flags |= SC_TBUSY; 1217 splx(s); 1218 (*sc->sc_start)(sc); 1219 } 1220 for (;;) { 1221 s = splnet(); 1222 IF_DEQUEUE(&sc->sc_rawq, m); 1223 splx(s); 1224 if (m == NULL) 1225 break; 1226 ppp_inproc(sc, m); 1227 } 1228 } 1229 1230 #ifdef PPP_COMPRESS 1231 /* 1232 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1233 * 0 if it is about to be transmitted. 1234 */ 1235 static void 1236 ppp_ccp(sc, m, rcvd) 1237 struct ppp_softc *sc; 1238 struct mbuf *m; 1239 int rcvd; 1240 { 1241 u_char *dp, *ep; 1242 struct mbuf *mp; 1243 int slen, s; 1244 1245 /* 1246 * Get a pointer to the data after the PPP header. 1247 */ 1248 if (m->m_len <= PPP_HDRLEN) { 1249 mp = m->m_next; 1250 if (mp == NULL) 1251 return; 1252 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1253 } else { 1254 mp = m; 1255 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1256 } 1257 1258 ep = mtod(mp, u_char *) + mp->m_len; 1259 if (dp + CCP_HDRLEN > ep) 1260 return; 1261 slen = CCP_LENGTH(dp); 1262 if (dp + slen > ep) { 1263 if (sc->sc_flags & SC_DEBUG) 1264 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1265 dp, slen, mtod(mp, u_char *), mp->m_len); 1266 return; 1267 } 1268 1269 switch (CCP_CODE(dp)) { 1270 case CCP_CONFREQ: 1271 case CCP_TERMREQ: 1272 case CCP_TERMACK: 1273 /* CCP must be going down - disable compression */ 1274 if (sc->sc_flags & SC_CCP_UP) { 1275 s = splhigh(); /* XXX IMP ME HARDER */ 1276 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1277 splx(s); 1278 } 1279 break; 1280 1281 case CCP_CONFACK: 1282 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1283 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1284 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1285 if (!rcvd) { 1286 /* we're agreeing to send compressed packets. */ 1287 if (sc->sc_xc_state != NULL 1288 && (*sc->sc_xcomp->comp_init) 1289 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1290 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1291 s = splhigh(); /* XXX IMP ME HARDER */ 1292 sc->sc_flags |= SC_COMP_RUN; 1293 splx(s); 1294 } 1295 } else { 1296 /* peer is agreeing to send compressed packets. */ 1297 if (sc->sc_rc_state != NULL 1298 && (*sc->sc_rcomp->decomp_init) 1299 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1300 sc->sc_unit, 0, sc->sc_mru, 1301 sc->sc_flags & SC_DEBUG)) { 1302 s = splhigh(); /* XXX IMP ME HARDER */ 1303 sc->sc_flags |= SC_DECOMP_RUN; 1304 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1305 splx(s); 1306 } 1307 } 1308 } 1309 break; 1310 1311 case CCP_RESETACK: 1312 if (sc->sc_flags & SC_CCP_UP) { 1313 if (!rcvd) { 1314 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1315 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1316 } else { 1317 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1318 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1319 s = splhigh(); /* XXX IMP ME HARDER */ 1320 sc->sc_flags &= ~SC_DC_ERROR; 1321 splx(s); 1322 } 1323 } 1324 } 1325 break; 1326 } 1327 } 1328 1329 /* 1330 * CCP is down; free (de)compressor state if necessary. 1331 */ 1332 static void 1333 ppp_ccp_closed(sc) 1334 struct ppp_softc *sc; 1335 { 1336 if (sc->sc_xc_state) { 1337 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1338 sc->sc_xc_state = NULL; 1339 } 1340 if (sc->sc_rc_state) { 1341 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1342 sc->sc_rc_state = NULL; 1343 } 1344 } 1345 #endif /* PPP_COMPRESS */ 1346 1347 /* 1348 * PPP packet input routine. 1349 * The caller has checked and removed the FCS and has inserted 1350 * the address/control bytes and the protocol high byte if they 1351 * were omitted. 1352 */ 1353 void 1354 ppppktin(sc, m, lost) 1355 struct ppp_softc *sc; 1356 struct mbuf *m; 1357 int lost; 1358 { 1359 int s = splhigh(); /* XXX IMP ME HARDER */ 1360 1361 if (lost) 1362 m->m_flags |= M_ERRMARK; 1363 IF_ENQUEUE(&sc->sc_rawq, m); 1364 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1365 softintr_schedule(sc->sc_si); 1366 #else 1367 schednetisr(NETISR_PPP); 1368 #endif 1369 splx(s); 1370 } 1371 1372 /* 1373 * Process a received PPP packet, doing decompression as necessary. 1374 * Should be called at splsoftnet. 1375 */ 1376 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1377 TYPE_UNCOMPRESSED_TCP) 1378 1379 static void 1380 ppp_inproc(sc, m) 1381 struct ppp_softc *sc; 1382 struct mbuf *m; 1383 { 1384 struct ifnet *ifp = &sc->sc_if; 1385 struct ifqueue *inq; 1386 int s, ilen, proto, rv; 1387 u_char *cp, adrs, ctrl; 1388 struct mbuf *mp, *dmp = NULL; 1389 #ifdef VJC 1390 int xlen; 1391 u_char *iphdr; 1392 u_int hlen; 1393 #endif 1394 1395 sc->sc_stats.ppp_ipackets++; 1396 1397 if (sc->sc_flags & SC_LOG_INPKT) { 1398 ilen = m->m_pkthdr.len; 1399 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1400 pppdumpm(m); 1401 } 1402 1403 cp = mtod(m, u_char *); 1404 adrs = PPP_ADDRESS(cp); 1405 ctrl = PPP_CONTROL(cp); 1406 proto = PPP_PROTOCOL(cp); 1407 1408 if (m->m_flags & M_ERRMARK) { 1409 m->m_flags &= ~M_ERRMARK; 1410 s = splhigh(); /* XXX IMP ME HARDER */ 1411 sc->sc_flags |= SC_VJ_RESET; 1412 splx(s); 1413 } 1414 1415 #ifdef PPP_COMPRESS 1416 /* 1417 * Decompress this packet if necessary, update the receiver's 1418 * dictionary, or take appropriate action on a CCP packet. 1419 */ 1420 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1421 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1422 /* decompress this packet */ 1423 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1424 if (rv == DECOMP_OK) { 1425 m_freem(m); 1426 if (dmp == NULL) { 1427 /* no error, but no decompressed packet produced */ 1428 return; 1429 } 1430 m = dmp; 1431 cp = mtod(m, u_char *); 1432 proto = PPP_PROTOCOL(cp); 1433 1434 } else { 1435 /* 1436 * An error has occurred in decompression. 1437 * Pass the compressed packet up to pppd, which may take 1438 * CCP down or issue a Reset-Req. 1439 */ 1440 if (sc->sc_flags & SC_DEBUG) 1441 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1442 s = splhigh(); /* XXX IMP ME HARDER */ 1443 sc->sc_flags |= SC_VJ_RESET; 1444 if (rv == DECOMP_ERROR) 1445 sc->sc_flags |= SC_DC_ERROR; 1446 else 1447 sc->sc_flags |= SC_DC_FERROR; 1448 splx(s); 1449 } 1450 1451 } else { 1452 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1453 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1454 } 1455 if (proto == PPP_CCP) { 1456 ppp_ccp(sc, m, 1); 1457 } 1458 } 1459 #endif 1460 1461 ilen = m->m_pkthdr.len; 1462 1463 #ifdef VJC 1464 if (sc->sc_flags & SC_VJ_RESET) { 1465 /* 1466 * If we've missed a packet, we must toss subsequent compressed 1467 * packets which don't have an explicit connection ID. 1468 */ 1469 if (sc->sc_comp) 1470 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1471 s = splhigh(); /* XXX IMP ME HARDER */ 1472 sc->sc_flags &= ~SC_VJ_RESET; 1473 splx(s); 1474 } 1475 1476 /* 1477 * See if we have a VJ-compressed packet to uncompress. 1478 */ 1479 if (proto == PPP_VJC_COMP) { 1480 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1481 goto bad; 1482 1483 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1484 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1485 sc->sc_comp, &iphdr, &hlen); 1486 1487 if (xlen <= 0) { 1488 if (sc->sc_flags & SC_DEBUG) 1489 printf("%s: VJ uncompress failed on type comp\n", 1490 ifp->if_xname); 1491 goto bad; 1492 } 1493 1494 /* Copy the PPP and IP headers into a new mbuf. */ 1495 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1496 if (mp == NULL) 1497 goto bad; 1498 mp->m_len = 0; 1499 mp->m_pkthdr.len = 0; 1500 if (hlen + PPP_HDRLEN > MHLEN) { 1501 MCLGET(mp, M_DONTWAIT); 1502 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1503 m_freem(mp); 1504 goto bad; /* lose if big headers and no clusters */ 1505 } 1506 } 1507 cp = mtod(mp, u_char *); 1508 cp[0] = adrs; 1509 cp[1] = ctrl; 1510 cp[2] = 0; 1511 cp[3] = PPP_IP; 1512 proto = PPP_IP; 1513 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1514 mp->m_len = hlen + PPP_HDRLEN; 1515 mp->m_pkthdr.len = mp->m_len; 1516 1517 /* 1518 * Trim the PPP and VJ headers off the old mbuf 1519 * and stick the new and old mbufs together. 1520 */ 1521 m->m_data += PPP_HDRLEN + xlen; 1522 m->m_len -= PPP_HDRLEN + xlen; 1523 m->m_pkthdr.len -= PPP_HDRLEN + xlen; 1524 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1525 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1526 mp->m_len += m->m_len; 1527 mp->m_pkthdr.len += m->m_len; 1528 MFREE(m, mp->m_next); 1529 } else 1530 mp->m_next = m; 1531 m = mp; 1532 ilen += hlen - xlen; 1533 1534 } else if (proto == PPP_VJC_UNCOMP) { 1535 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1536 goto bad; 1537 1538 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1539 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1540 sc->sc_comp, &iphdr, &hlen); 1541 1542 if (xlen < 0) { 1543 if (sc->sc_flags & SC_DEBUG) 1544 printf("%s: VJ uncompress failed on type uncomp\n", 1545 ifp->if_xname); 1546 goto bad; 1547 } 1548 1549 proto = PPP_IP; 1550 cp[3] = PPP_IP; 1551 } 1552 #endif /* VJC */ 1553 1554 /* 1555 * If the packet will fit in a header mbuf, don't waste a 1556 * whole cluster on it. 1557 */ 1558 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1559 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1560 if (mp != NULL) { 1561 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1562 m_freem(m); 1563 m = mp; 1564 m->m_len = ilen; 1565 } 1566 } 1567 m->m_pkthdr.len = ilen; 1568 m->m_pkthdr.rcvif = ifp; 1569 1570 if ((proto & 0x8000) == 0) { 1571 #ifdef PPP_FILTER 1572 /* 1573 * See whether we want to pass this packet, and 1574 * if it counts as link activity. 1575 */ 1576 if (sc->sc_pass_filt_in.bf_insns != 0 1577 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1578 ilen, 0) == 0) { 1579 /* drop this packet */ 1580 m_freem(m); 1581 return; 1582 } 1583 if (sc->sc_active_filt_in.bf_insns == 0 1584 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1585 ilen, 0)) 1586 sc->sc_last_recv = time.tv_sec; 1587 #else 1588 /* 1589 * Record the time that we received this packet. 1590 */ 1591 sc->sc_last_recv = time.tv_sec; 1592 #endif /* PPP_FILTER */ 1593 } 1594 1595 #if NBPFILTER > 0 1596 /* See if bpf wants to look at the packet. */ 1597 if (sc->sc_if.if_bpf) 1598 bpf_mtap(sc->sc_if.if_bpf, m); 1599 #endif 1600 1601 rv = 0; 1602 switch (proto) { 1603 #ifdef INET 1604 case PPP_IP: 1605 /* 1606 * IP packet - take off the ppp header and pass it up to IP. 1607 */ 1608 if ((ifp->if_flags & IFF_UP) == 0 1609 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1610 /* interface is down - drop the packet. */ 1611 m_freem(m); 1612 return; 1613 } 1614 m->m_pkthdr.len -= PPP_HDRLEN; 1615 m->m_data += PPP_HDRLEN; 1616 m->m_len -= PPP_HDRLEN; 1617 #ifdef GATEWAY 1618 if (ipflow_fastforward(m)) 1619 return; 1620 #endif 1621 schednetisr(NETISR_IP); 1622 inq = &ipintrq; 1623 break; 1624 #endif 1625 1626 #ifdef INET6 1627 case PPP_IPV6: 1628 /* 1629 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1630 */ 1631 if ((ifp->if_flags & IFF_UP) == 0 1632 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1633 /* interface is down - drop the packet. */ 1634 m_freem(m); 1635 return; 1636 } 1637 m->m_pkthdr.len -= PPP_HDRLEN; 1638 m->m_data += PPP_HDRLEN; 1639 m->m_len -= PPP_HDRLEN; 1640 schednetisr(NETISR_IPV6); 1641 inq = &ip6intrq; 1642 break; 1643 #endif 1644 1645 default: 1646 /* 1647 * Some other protocol - place on input queue for read(). 1648 */ 1649 inq = &sc->sc_inq; 1650 rv = 1; 1651 break; 1652 } 1653 1654 /* 1655 * Put the packet on the appropriate input queue. 1656 */ 1657 s = splnet(); 1658 if (IF_QFULL(inq)) { 1659 IF_DROP(inq); 1660 splx(s); 1661 if (sc->sc_flags & SC_DEBUG) 1662 printf("%s: input queue full\n", ifp->if_xname); 1663 ifp->if_iqdrops++; 1664 goto bad; 1665 } 1666 IF_ENQUEUE(inq, m); 1667 splx(s); 1668 ifp->if_ipackets++; 1669 ifp->if_ibytes += ilen; 1670 1671 if (rv) 1672 (*sc->sc_ctlp)(sc); 1673 1674 return; 1675 1676 bad: 1677 m_freem(m); 1678 sc->sc_if.if_ierrors++; 1679 sc->sc_stats.ppp_ierrors++; 1680 } 1681 1682 #define MAX_DUMP_BYTES 128 1683 1684 static void 1685 pppdumpm(m0) 1686 struct mbuf *m0; 1687 { 1688 char buf[3*MAX_DUMP_BYTES+4]; 1689 char *bp = buf; 1690 struct mbuf *m; 1691 static char digits[] = "0123456789abcdef"; 1692 1693 for (m = m0; m; m = m->m_next) { 1694 int l = m->m_len; 1695 u_char *rptr = (u_char *)m->m_data; 1696 1697 while (l--) { 1698 if (bp > buf + sizeof(buf) - 4) 1699 goto done; 1700 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1701 *bp++ = digits[*rptr++ & 0xf]; 1702 } 1703 1704 if (m->m_next) { 1705 if (bp > buf + sizeof(buf) - 3) 1706 goto done; 1707 *bp++ = '|'; 1708 } else 1709 *bp++ = ' '; 1710 } 1711 done: 1712 if (m) 1713 *bp++ = '>'; 1714 *bp = 0; 1715 printf("%s\n", buf); 1716 } 1717 1718 #ifdef ALTQ 1719 /* 1720 * a wrapper to transmit a packet from if_start since ALTQ uses 1721 * if_start to send a packet. 1722 */ 1723 static void 1724 ppp_ifstart(ifp) 1725 struct ifnet *ifp; 1726 { 1727 struct ppp_softc *sc; 1728 1729 sc = ifp->if_softc; 1730 (*sc->sc_start)(sc); 1731 } 1732 #endif 1733
Indexes created Fri Oct 03 02:09:57 GMT 2025