if_ppp.c revision 1.87
1 /* $NetBSD: if_ppp.c,v 1.87 2003/10/28 20:15:19 mycroft 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 1.87 2003/10/28 20:15:19 mycroft 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[PPP_COMPRESSORS_MAX] = { 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 /*###413 [cc] warning: `bp' might be used uninitialized in this function%%%*/ 414 struct bpf_program *bp, *nbp; 415 struct bpf_insn *newcode, *oldcode; 416 int newcodelen; 417 #endif /* PPP_FILTER */ 418 #ifdef PPP_COMPRESS 419 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 420 #endif 421 422 switch (cmd) { 423 case FIONREAD: 424 *(int *)data = sc->sc_inq.ifq_len; 425 break; 426 427 case PPPIOCGUNIT: 428 *(int *)data = sc->sc_unit; /* XXX */ 429 break; 430 431 case PPPIOCGFLAGS: 432 *(u_int *)data = sc->sc_flags; 433 break; 434 435 case PPPIOCGRAWIN: 436 { 437 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 438 u_char p, q = 0; 439 440 for (p = sc->sc_rawin_start; p < sizeof(sc->sc_rawin.buf);) 441 rwin->buf[q++] = sc->sc_rawin.buf[p++]; 442 443 for (p = 0; p < sc->sc_rawin_start;) 444 rwin->buf[q++] = sc->sc_rawin.buf[p++]; 445 446 rwin->count = sc->sc_rawin.count; 447 } 448 break; 449 450 case PPPIOCSFLAGS: 451 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 452 return (error); 453 flags = *(int *)data & SC_MASK; 454 s = splsoftnet(); 455 #ifdef PPP_COMPRESS 456 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 457 ppp_ccp_closed(sc); 458 #endif 459 splhigh(); /* XXX IMP ME HARDER */ 460 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 461 splx(s); 462 break; 463 464 case PPPIOCSMRU: 465 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 466 return (error); 467 mru = *(int *)data; 468 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 469 sc->sc_mru = mru; 470 break; 471 472 case PPPIOCGMRU: 473 *(int *)data = sc->sc_mru; 474 break; 475 476 #ifdef VJC 477 case PPPIOCSMAXCID: 478 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 479 return (error); 480 if (sc->sc_comp) { 481 s = splsoftnet(); 482 sl_compress_setup(sc->sc_comp, *(int *)data); 483 splx(s); 484 } 485 break; 486 #endif 487 488 case PPPIOCXFERUNIT: 489 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 490 return (error); 491 sc->sc_xfer = p->p_pid; 492 break; 493 494 #ifdef PPP_COMPRESS 495 case PPPIOCSCOMPRESS: 496 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 497 return (error); 498 odp = (struct ppp_option_data *) data; 499 nb = odp->length; 500 if (nb > sizeof(ccp_option)) 501 nb = sizeof(ccp_option); 502 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 503 return (error); 504 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 505 return (EINVAL); 506 for (cp = ppp_compressors; *cp != NULL; ++cp) 507 if ((*cp)->compress_proto == ccp_option[0]) { 508 /* 509 * Found a handler for the protocol - try to allocate 510 * a compressor or decompressor. 511 */ 512 error = 0; 513 if (odp->transmit) { 514 s = splsoftnet(); 515 if (sc->sc_xc_state != NULL) 516 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 517 sc->sc_xcomp = *cp; 518 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 519 if (sc->sc_xc_state == NULL) { 520 if (sc->sc_flags & SC_DEBUG) 521 printf("%s: comp_alloc failed\n", 522 sc->sc_if.if_xname); 523 error = ENOBUFS; 524 } 525 splhigh(); /* XXX IMP ME HARDER */ 526 sc->sc_flags &= ~SC_COMP_RUN; 527 splx(s); 528 } else { 529 s = splsoftnet(); 530 if (sc->sc_rc_state != NULL) 531 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 532 sc->sc_rcomp = *cp; 533 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 534 if (sc->sc_rc_state == NULL) { 535 if (sc->sc_flags & SC_DEBUG) 536 printf("%s: decomp_alloc failed\n", 537 sc->sc_if.if_xname); 538 error = ENOBUFS; 539 } 540 splhigh(); /* XXX IMP ME HARDER */ 541 sc->sc_flags &= ~SC_DECOMP_RUN; 542 splx(s); 543 } 544 return (error); 545 } 546 if (sc->sc_flags & SC_DEBUG) 547 printf("%s: no compressor for [%x %x %x], %x\n", 548 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 549 ccp_option[2], nb); 550 return (EINVAL); /* no handler found */ 551 #endif /* PPP_COMPRESS */ 552 553 case PPPIOCGNPMODE: 554 case PPPIOCSNPMODE: 555 npi = (struct npioctl *) data; 556 switch (npi->protocol) { 557 case PPP_IP: 558 npx = NP_IP; 559 break; 560 case PPP_IPV6: 561 npx = NP_IPV6; 562 break; 563 default: 564 return EINVAL; 565 } 566 if (cmd == PPPIOCGNPMODE) { 567 npi->mode = sc->sc_npmode[npx]; 568 } else { 569 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 570 return (error); 571 if (npi->mode != sc->sc_npmode[npx]) { 572 s = splnet(); 573 sc->sc_npmode[npx] = npi->mode; 574 if (npi->mode != NPMODE_QUEUE) { 575 ppp_requeue(sc); 576 ppp_restart(sc); 577 } 578 splx(s); 579 } 580 } 581 break; 582 583 case PPPIOCGIDLE: 584 s = splsoftnet(); 585 t = time.tv_sec; 586 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 587 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 588 splx(s); 589 break; 590 591 #ifdef PPP_FILTER 592 case PPPIOCSPASS: 593 case PPPIOCSACTIVE: 594 /* These are no longer supported. */ 595 return EOPNOTSUPP; 596 597 case PPPIOCSIPASS: 598 case PPPIOCSOPASS: 599 case PPPIOCSIACTIVE: 600 case PPPIOCSOACTIVE: 601 nbp = (struct bpf_program *) data; 602 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 603 return EINVAL; 604 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 605 if (newcodelen != 0) { 606 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 607 /* WAITOK -- malloc() never fails. */ 608 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 609 newcodelen)) != 0) { 610 free(newcode, M_DEVBUF); 611 return error; 612 } 613 if (!bpf_validate(newcode, nbp->bf_len)) { 614 free(newcode, M_DEVBUF); 615 return EINVAL; 616 } 617 } else 618 newcode = 0; 619 switch (cmd) { 620 case PPPIOCSIPASS: 621 bp = &sc->sc_pass_filt_in; 622 break; 623 624 case PPPIOCSOPASS: 625 bp = &sc->sc_pass_filt_out; 626 break; 627 628 case PPPIOCSIACTIVE: 629 bp = &sc->sc_active_filt_in; 630 break; 631 632 case PPPIOCSOACTIVE: 633 bp = &sc->sc_active_filt_out; 634 break; 635 default: 636 return (EPASSTHROUGH); 637 } 638 oldcode = bp->bf_insns; 639 s = splnet(); 640 bp->bf_len = nbp->bf_len; 641 bp->bf_insns = newcode; 642 splx(s); 643 if (oldcode != 0) 644 free(oldcode, M_DEVBUF); 645 break; 646 #endif /* PPP_FILTER */ 647 648 default: 649 return (EPASSTHROUGH); 650 } 651 return (0); 652 } 653 654 /* 655 * Process an ioctl request to the ppp network interface. 656 */ 657 static int 658 pppsioctl(ifp, cmd, data) 659 struct ifnet *ifp; 660 u_long cmd; 661 caddr_t data; 662 { 663 struct proc *p = curproc; /* XXX */ 664 struct ppp_softc *sc = ifp->if_softc; 665 struct ifaddr *ifa = (struct ifaddr *)data; 666 struct ifreq *ifr = (struct ifreq *)data; 667 struct ppp_stats *psp; 668 #ifdef PPP_COMPRESS 669 struct ppp_comp_stats *pcp; 670 #endif 671 int s = splnet(), error = 0; 672 673 switch (cmd) { 674 case SIOCSIFFLAGS: 675 if ((ifp->if_flags & IFF_RUNNING) == 0) 676 ifp->if_flags &= ~IFF_UP; 677 break; 678 679 case SIOCSIFADDR: 680 switch (ifa->ifa_addr->sa_family) { 681 #ifdef INET 682 case AF_INET: 683 break; 684 #endif 685 #ifdef INET6 686 case AF_INET6: 687 break; 688 #endif 689 default: 690 error = EAFNOSUPPORT; 691 break; 692 } 693 break; 694 695 case SIOCSIFDSTADDR: 696 switch (ifa->ifa_addr->sa_family) { 697 #ifdef INET 698 case AF_INET: 699 break; 700 #endif 701 #ifdef INET6 702 case AF_INET6: 703 break; 704 #endif 705 default: 706 error = EAFNOSUPPORT; 707 break; 708 } 709 break; 710 711 case SIOCSIFMTU: 712 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 713 break; 714 sc->sc_if.if_mtu = ifr->ifr_mtu; 715 break; 716 717 case SIOCGIFMTU: 718 ifr->ifr_mtu = sc->sc_if.if_mtu; 719 break; 720 721 case SIOCADDMULTI: 722 case SIOCDELMULTI: 723 if (ifr == 0) { 724 error = EAFNOSUPPORT; 725 break; 726 } 727 switch (ifr->ifr_addr.sa_family) { 728 #ifdef INET 729 case AF_INET: 730 break; 731 #endif 732 #ifdef INET6 733 case AF_INET6: 734 break; 735 #endif 736 default: 737 error = EAFNOSUPPORT; 738 break; 739 } 740 break; 741 742 case SIOCGPPPSTATS: 743 psp = &((struct ifpppstatsreq *) data)->stats; 744 memset(psp, 0, sizeof(*psp)); 745 psp->p = sc->sc_stats; 746 #if defined(VJC) && !defined(SL_NO_STATS) 747 if (sc->sc_comp) { 748 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 749 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 750 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 751 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 752 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 753 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 754 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 755 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 756 } 757 #endif /* VJC */ 758 break; 759 760 #ifdef PPP_COMPRESS 761 case SIOCGPPPCSTATS: 762 pcp = &((struct ifpppcstatsreq *) data)->stats; 763 memset(pcp, 0, sizeof(*pcp)); 764 if (sc->sc_xc_state != NULL) 765 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 766 if (sc->sc_rc_state != NULL) 767 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 768 break; 769 #endif /* PPP_COMPRESS */ 770 771 default: 772 error = EINVAL; 773 } 774 splx(s); 775 return (error); 776 } 777 778 /* 779 * Queue a packet. Start transmission if not active. 780 * Packet is placed in Information field of PPP frame. 781 */ 782 int 783 pppoutput(ifp, m0, dst, rtp) 784 struct ifnet *ifp; 785 struct mbuf *m0; 786 struct sockaddr *dst; 787 struct rtentry *rtp; 788 { 789 struct ppp_softc *sc = ifp->if_softc; 790 int protocol, address, control; 791 u_char *cp; 792 int s, error; 793 #ifdef INET 794 struct ip *ip; 795 #endif 796 struct ifqueue *ifq; 797 enum NPmode mode; 798 int len; 799 struct mbuf *m; 800 ALTQ_DECL(struct altq_pktattr pktattr;) 801 802 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 803 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 804 error = ENETDOWN; /* sort of */ 805 goto bad; 806 } 807 808 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 809 810 /* 811 * Compute PPP header. 812 */ 813 m0->m_flags &= ~M_HIGHPRI; 814 switch (dst->sa_family) { 815 #ifdef INET 816 case AF_INET: 817 address = PPP_ALLSTATIONS; 818 control = PPP_UI; 819 protocol = PPP_IP; 820 mode = sc->sc_npmode[NP_IP]; 821 822 /* 823 * If this packet has the "low delay" bit set in the IP header, 824 * put it on the fastq instead. 825 */ 826 ip = mtod(m0, struct ip *); 827 if (ip->ip_tos & IPTOS_LOWDELAY) 828 m0->m_flags |= M_HIGHPRI; 829 break; 830 #endif 831 #ifdef INET6 832 case AF_INET6: 833 address = PPP_ALLSTATIONS; /*XXX*/ 834 control = PPP_UI; /*XXX*/ 835 protocol = PPP_IPV6; 836 mode = sc->sc_npmode[NP_IPV6]; 837 838 #if 0 /* XXX flowinfo/traffic class, maybe? */ 839 /* 840 * If this packet has the "low delay" bit set in the IP header, 841 * put it on the fastq instead. 842 */ 843 ip = mtod(m0, struct ip *); 844 if (ip->ip_tos & IPTOS_LOWDELAY) 845 m0->m_flags |= M_HIGHPRI; 846 #endif 847 break; 848 #endif 849 case AF_UNSPEC: 850 address = PPP_ADDRESS(dst->sa_data); 851 control = PPP_CONTROL(dst->sa_data); 852 protocol = PPP_PROTOCOL(dst->sa_data); 853 mode = NPMODE_PASS; 854 break; 855 default: 856 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 857 error = EAFNOSUPPORT; 858 goto bad; 859 } 860 861 /* 862 * Drop this packet, or return an error, if necessary. 863 */ 864 if (mode == NPMODE_ERROR) { 865 error = ENETDOWN; 866 goto bad; 867 } 868 if (mode == NPMODE_DROP) { 869 error = 0; 870 goto bad; 871 } 872 873 /* 874 * Add PPP header. If no space in first mbuf, allocate another. 875 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) 876 */ 877 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { 878 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); 879 if (m0 == 0) { 880 error = ENOBUFS; 881 goto bad; 882 } 883 m0->m_len = 0; 884 } else 885 m0->m_data -= PPP_HDRLEN; 886 887 cp = mtod(m0, u_char *); 888 *cp++ = address; 889 *cp++ = control; 890 *cp++ = protocol >> 8; 891 *cp++ = protocol & 0xff; 892 m0->m_len += PPP_HDRLEN; 893 894 len = 0; 895 for (m = m0; m != 0; m = m->m_next) 896 len += m->m_len; 897 898 if (sc->sc_flags & SC_LOG_OUTPKT) { 899 printf("%s output: ", ifp->if_xname); 900 pppdumpm(m0); 901 } 902 903 if ((protocol & 0x8000) == 0) { 904 #ifdef PPP_FILTER 905 /* 906 * Apply the pass and active filters to the packet, 907 * but only if it is a data packet. 908 */ 909 if (sc->sc_pass_filt_out.bf_insns != 0 910 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 911 len, 0) == 0) { 912 error = 0; /* drop this packet */ 913 goto bad; 914 } 915 916 /* 917 * Update the time we sent the most recent packet. 918 */ 919 if (sc->sc_active_filt_out.bf_insns == 0 920 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 921 len, 0)) 922 sc->sc_last_sent = time.tv_sec; 923 #else 924 /* 925 * Update the time we sent the most recent packet. 926 */ 927 sc->sc_last_sent = time.tv_sec; 928 #endif /* PPP_FILTER */ 929 } 930 931 #if NBPFILTER > 0 932 /* 933 * See if bpf wants to look at the packet. 934 */ 935 if (sc->sc_if.if_bpf) 936 bpf_mtap(sc->sc_if.if_bpf, m0); 937 #endif 938 939 /* 940 * Put the packet on the appropriate queue. 941 */ 942 s = splnet(); 943 if (mode == NPMODE_QUEUE) { 944 /* XXX we should limit the number of packets on this queue */ 945 *sc->sc_npqtail = m0; 946 m0->m_nextpkt = NULL; 947 sc->sc_npqtail = &m0->m_nextpkt; 948 } else { 949 if ((m0->m_flags & M_HIGHPRI) 950 #ifdef ALTQ 951 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 952 #endif 953 ) { 954 ifq = &sc->sc_fastq; 955 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { 956 IF_DROP(ifq); 957 splx(s); 958 error = ENOBUFS; 959 goto bad; 960 } else { 961 IF_ENQUEUE(ifq, m0); 962 error = 0; 963 } 964 } else 965 IFQ_ENQUEUE(&sc->sc_if.if_snd, m0, &pktattr, error); 966 if (error) { 967 splx(s); 968 sc->sc_if.if_oerrors++; 969 sc->sc_stats.ppp_oerrors++; 970 return (error); 971 } 972 ppp_restart(sc); 973 } 974 ifp->if_opackets++; 975 ifp->if_obytes += len; 976 977 splx(s); 978 return (0); 979 980 bad: 981 m_freem(m0); 982 return (error); 983 } 984 985 /* 986 * After a change in the NPmode for some NP, move packets from the 987 * npqueue to the send queue or the fast queue as appropriate. 988 * Should be called at splnet, since we muck with the queues. 989 */ 990 static void 991 ppp_requeue(sc) 992 struct ppp_softc *sc; 993 { 994 struct mbuf *m, **mpp; 995 struct ifqueue *ifq; 996 enum NPmode mode; 997 int error; 998 999 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1000 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1001 case PPP_IP: 1002 mode = sc->sc_npmode[NP_IP]; 1003 break; 1004 case PPP_IPV6: 1005 mode = sc->sc_npmode[NP_IPV6]; 1006 break; 1007 default: 1008 mode = NPMODE_PASS; 1009 } 1010 1011 switch (mode) { 1012 case NPMODE_PASS: 1013 /* 1014 * This packet can now go on one of the queues to be sent. 1015 */ 1016 *mpp = m->m_nextpkt; 1017 m->m_nextpkt = NULL; 1018 if ((m->m_flags & M_HIGHPRI) 1019 #ifdef ALTQ 1020 && ALTQ_IS_ENABLED(&sc->sc_if.if_snd) == 0 1021 #endif 1022 ) { 1023 ifq = &sc->sc_fastq; 1024 if (IF_QFULL(ifq)) { 1025 IF_DROP(ifq); 1026 m_freem(m); 1027 error = ENOBUFS; 1028 } else { 1029 IF_ENQUEUE(ifq, m); 1030 error = 0; 1031 } 1032 } else 1033 IFQ_ENQUEUE(&sc->sc_if.if_snd, m, NULL, error); 1034 if (error) { 1035 sc->sc_if.if_oerrors++; 1036 sc->sc_stats.ppp_oerrors++; 1037 } 1038 break; 1039 1040 case NPMODE_DROP: 1041 case NPMODE_ERROR: 1042 *mpp = m->m_nextpkt; 1043 m_freem(m); 1044 break; 1045 1046 case NPMODE_QUEUE: 1047 mpp = &m->m_nextpkt; 1048 break; 1049 } 1050 } 1051 sc->sc_npqtail = mpp; 1052 } 1053 1054 /* 1055 * Transmitter has finished outputting some stuff; 1056 * remember to call sc->sc_start later at splsoftnet. 1057 */ 1058 void 1059 ppp_restart(sc) 1060 struct ppp_softc *sc; 1061 { 1062 int s = splhigh(); /* XXX IMP ME HARDER */ 1063 1064 sc->sc_flags &= ~SC_TBUSY; 1065 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1066 softintr_schedule(sc->sc_si); 1067 #else 1068 schednetisr(NETISR_PPP); 1069 #endif 1070 splx(s); 1071 } 1072 1073 /* 1074 * Get a packet to send. This procedure is intended to be called at 1075 * splsoftnet, since it may involve time-consuming operations such as 1076 * applying VJ compression, packet compression, address/control and/or 1077 * protocol field compression to the packet. 1078 */ 1079 struct mbuf * 1080 ppp_dequeue(sc) 1081 struct ppp_softc *sc; 1082 { 1083 struct mbuf *m, *mp; 1084 u_char *cp; 1085 int address, control, protocol; 1086 int s; 1087 1088 /* 1089 * Grab a packet to send: first try the fast queue, then the 1090 * normal queue. 1091 */ 1092 s = splnet(); 1093 IF_DEQUEUE(&sc->sc_fastq, m); 1094 if (m == NULL) 1095 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1096 splx(s); 1097 1098 if (m == NULL) 1099 return NULL; 1100 1101 ++sc->sc_stats.ppp_opackets; 1102 1103 /* 1104 * Extract the ppp header of the new packet. 1105 * The ppp header will be in one mbuf. 1106 */ 1107 cp = mtod(m, u_char *); 1108 address = PPP_ADDRESS(cp); 1109 control = PPP_CONTROL(cp); 1110 protocol = PPP_PROTOCOL(cp); 1111 1112 switch (protocol) { 1113 case PPP_IP: 1114 #ifdef VJC 1115 /* 1116 * If the packet is a TCP/IP packet, see if we can compress it. 1117 */ 1118 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1119 struct ip *ip; 1120 int type; 1121 1122 mp = m; 1123 ip = (struct ip *) (cp + PPP_HDRLEN); 1124 if (mp->m_len <= PPP_HDRLEN) { 1125 mp = mp->m_next; 1126 if (mp == NULL) 1127 break; 1128 ip = mtod(mp, struct ip *); 1129 } 1130 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1131 if (ip->ip_p == IPPROTO_TCP) { 1132 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1133 !(sc->sc_flags & SC_NO_TCP_CCID)); 1134 switch (type) { 1135 case TYPE_UNCOMPRESSED_TCP: 1136 protocol = PPP_VJC_UNCOMP; 1137 break; 1138 case TYPE_COMPRESSED_TCP: 1139 protocol = PPP_VJC_COMP; 1140 cp = mtod(m, u_char *); 1141 cp[0] = address; /* header has moved */ 1142 cp[1] = control; 1143 cp[2] = 0; 1144 break; 1145 } 1146 cp[3] = protocol; /* update protocol in PPP header */ 1147 } 1148 } 1149 #endif /* VJC */ 1150 break; 1151 1152 #ifdef PPP_COMPRESS 1153 case PPP_CCP: 1154 ppp_ccp(sc, m, 0); 1155 break; 1156 #endif /* PPP_COMPRESS */ 1157 } 1158 1159 #ifdef PPP_COMPRESS 1160 if (protocol != PPP_LCP && protocol != PPP_CCP 1161 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1162 struct mbuf *mcomp = NULL; 1163 int slen; 1164 1165 slen = 0; 1166 for (mp = m; mp != NULL; mp = mp->m_next) 1167 slen += mp->m_len; 1168 (*sc->sc_xcomp->compress) 1169 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1170 if (mcomp != NULL) { 1171 if (sc->sc_flags & SC_CCP_UP) { 1172 /* Send the compressed packet instead of the original. */ 1173 m_freem(m); 1174 m = mcomp; 1175 cp = mtod(m, u_char *); 1176 protocol = cp[3]; 1177 } else { 1178 /* Can't transmit compressed packets until CCP is up. */ 1179 m_freem(mcomp); 1180 } 1181 } 1182 } 1183 #endif /* PPP_COMPRESS */ 1184 1185 /* 1186 * Compress the address/control and protocol, if possible. 1187 */ 1188 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1189 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1190 protocol != PPP_LCP) { 1191 /* can compress address/control */ 1192 m->m_data += 2; 1193 m->m_len -= 2; 1194 } 1195 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1196 /* can compress protocol */ 1197 if (mtod(m, u_char *) == cp) { 1198 cp[2] = cp[1]; /* move address/control up */ 1199 cp[1] = cp[0]; 1200 } 1201 ++m->m_data; 1202 --m->m_len; 1203 } 1204 1205 return m; 1206 } 1207 1208 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1209 void 1210 pppnetisr(void) 1211 { 1212 struct ppp_softc *sc; 1213 int i; 1214 1215 for (i = 0; i < NPPP; i++) { 1216 sc = &ppp_softc[i]; 1217 pppintr(sc); 1218 } 1219 } 1220 #endif 1221 1222 /* 1223 * Software interrupt routine, called at splsoftnet. 1224 */ 1225 void 1226 pppintr(void *arg) 1227 { 1228 struct ppp_softc *sc = arg; 1229 struct mbuf *m; 1230 int s; 1231 1232 if (!(sc->sc_flags & SC_TBUSY) 1233 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1234 || sc->sc_outm)) { 1235 s = splhigh(); /* XXX IMP ME HARDER */ 1236 sc->sc_flags |= SC_TBUSY; 1237 splx(s); 1238 (*sc->sc_start)(sc); 1239 } 1240 for (;;) { 1241 s = splnet(); 1242 IF_DEQUEUE(&sc->sc_rawq, m); 1243 splx(s); 1244 if (m == NULL) 1245 break; 1246 ppp_inproc(sc, m); 1247 } 1248 } 1249 1250 #ifdef PPP_COMPRESS 1251 /* 1252 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1253 * 0 if it is about to be transmitted. 1254 */ 1255 static void 1256 ppp_ccp(sc, m, rcvd) 1257 struct ppp_softc *sc; 1258 struct mbuf *m; 1259 int rcvd; 1260 { 1261 u_char *dp, *ep; 1262 struct mbuf *mp; 1263 int slen, s; 1264 1265 /* 1266 * Get a pointer to the data after the PPP header. 1267 */ 1268 if (m->m_len <= PPP_HDRLEN) { 1269 mp = m->m_next; 1270 if (mp == NULL) 1271 return; 1272 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1273 } else { 1274 mp = m; 1275 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1276 } 1277 1278 ep = mtod(mp, u_char *) + mp->m_len; 1279 if (dp + CCP_HDRLEN > ep) 1280 return; 1281 slen = CCP_LENGTH(dp); 1282 if (dp + slen > ep) { 1283 if (sc->sc_flags & SC_DEBUG) 1284 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1285 dp, slen, mtod(mp, u_char *), mp->m_len); 1286 return; 1287 } 1288 1289 switch (CCP_CODE(dp)) { 1290 case CCP_CONFREQ: 1291 case CCP_TERMREQ: 1292 case CCP_TERMACK: 1293 /* CCP must be going down - disable compression */ 1294 if (sc->sc_flags & SC_CCP_UP) { 1295 s = splhigh(); /* XXX IMP ME HARDER */ 1296 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1297 splx(s); 1298 } 1299 break; 1300 1301 case CCP_CONFACK: 1302 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1303 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1304 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1305 if (!rcvd) { 1306 /* we're agreeing to send compressed packets. */ 1307 if (sc->sc_xc_state != NULL 1308 && (*sc->sc_xcomp->comp_init) 1309 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1310 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1311 s = splhigh(); /* XXX IMP ME HARDER */ 1312 sc->sc_flags |= SC_COMP_RUN; 1313 splx(s); 1314 } 1315 } else { 1316 /* peer is agreeing to send compressed packets. */ 1317 if (sc->sc_rc_state != NULL 1318 && (*sc->sc_rcomp->decomp_init) 1319 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1320 sc->sc_unit, 0, sc->sc_mru, 1321 sc->sc_flags & SC_DEBUG)) { 1322 s = splhigh(); /* XXX IMP ME HARDER */ 1323 sc->sc_flags |= SC_DECOMP_RUN; 1324 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1325 splx(s); 1326 } 1327 } 1328 } 1329 break; 1330 1331 case CCP_RESETACK: 1332 if (sc->sc_flags & SC_CCP_UP) { 1333 if (!rcvd) { 1334 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1335 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1336 } else { 1337 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1338 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1339 s = splhigh(); /* XXX IMP ME HARDER */ 1340 sc->sc_flags &= ~SC_DC_ERROR; 1341 splx(s); 1342 } 1343 } 1344 } 1345 break; 1346 } 1347 } 1348 1349 /* 1350 * CCP is down; free (de)compressor state if necessary. 1351 */ 1352 static void 1353 ppp_ccp_closed(sc) 1354 struct ppp_softc *sc; 1355 { 1356 if (sc->sc_xc_state) { 1357 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1358 sc->sc_xc_state = NULL; 1359 } 1360 if (sc->sc_rc_state) { 1361 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1362 sc->sc_rc_state = NULL; 1363 } 1364 } 1365 #endif /* PPP_COMPRESS */ 1366 1367 /* 1368 * PPP packet input routine. 1369 * The caller has checked and removed the FCS and has inserted 1370 * the address/control bytes and the protocol high byte if they 1371 * were omitted. 1372 */ 1373 void 1374 ppppktin(sc, m, lost) 1375 struct ppp_softc *sc; 1376 struct mbuf *m; 1377 int lost; 1378 { 1379 int s = splhigh(); /* XXX IMP ME HARDER */ 1380 1381 if (lost) 1382 m->m_flags |= M_ERRMARK; 1383 IF_ENQUEUE(&sc->sc_rawq, m); 1384 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1385 softintr_schedule(sc->sc_si); 1386 #else 1387 schednetisr(NETISR_PPP); 1388 #endif 1389 splx(s); 1390 } 1391 1392 /* 1393 * Process a received PPP packet, doing decompression as necessary. 1394 * Should be called at splsoftnet. 1395 */ 1396 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1397 TYPE_UNCOMPRESSED_TCP) 1398 1399 static void 1400 ppp_inproc(sc, m) 1401 struct ppp_softc *sc; 1402 struct mbuf *m; 1403 { 1404 struct ifnet *ifp = &sc->sc_if; 1405 struct ifqueue *inq; 1406 int s, ilen, proto, rv; 1407 u_char *cp, adrs, ctrl; 1408 struct mbuf *mp, *dmp = NULL; 1409 #ifdef VJC 1410 int xlen; 1411 u_char *iphdr; 1412 u_int hlen; 1413 #endif 1414 1415 sc->sc_stats.ppp_ipackets++; 1416 1417 if (sc->sc_flags & SC_LOG_INPKT) { 1418 ilen = 0; 1419 for (mp = m; mp != NULL; mp = mp->m_next) 1420 ilen += mp->m_len; 1421 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1422 pppdumpm(m); 1423 } 1424 1425 cp = mtod(m, u_char *); 1426 adrs = PPP_ADDRESS(cp); 1427 ctrl = PPP_CONTROL(cp); 1428 proto = PPP_PROTOCOL(cp); 1429 1430 if (m->m_flags & M_ERRMARK) { 1431 m->m_flags &= ~M_ERRMARK; 1432 s = splhigh(); /* XXX IMP ME HARDER */ 1433 sc->sc_flags |= SC_VJ_RESET; 1434 splx(s); 1435 } 1436 1437 #ifdef PPP_COMPRESS 1438 /* 1439 * Decompress this packet if necessary, update the receiver's 1440 * dictionary, or take appropriate action on a CCP packet. 1441 */ 1442 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1443 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1444 /* decompress this packet */ 1445 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1446 if (rv == DECOMP_OK) { 1447 m_freem(m); 1448 if (dmp == NULL) { 1449 /* no error, but no decompressed packet produced */ 1450 return; 1451 } 1452 m = dmp; 1453 cp = mtod(m, u_char *); 1454 proto = PPP_PROTOCOL(cp); 1455 1456 } else { 1457 /* 1458 * An error has occurred in decompression. 1459 * Pass the compressed packet up to pppd, which may take 1460 * CCP down or issue a Reset-Req. 1461 */ 1462 if (sc->sc_flags & SC_DEBUG) 1463 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1464 s = splhigh(); /* XXX IMP ME HARDER */ 1465 sc->sc_flags |= SC_VJ_RESET; 1466 if (rv == DECOMP_ERROR) 1467 sc->sc_flags |= SC_DC_ERROR; 1468 else 1469 sc->sc_flags |= SC_DC_FERROR; 1470 splx(s); 1471 } 1472 1473 } else { 1474 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1475 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1476 } 1477 if (proto == PPP_CCP) { 1478 ppp_ccp(sc, m, 1); 1479 } 1480 } 1481 #endif 1482 1483 ilen = 0; 1484 for (mp = m; mp != NULL; mp = mp->m_next) 1485 ilen += mp->m_len; 1486 1487 #ifdef VJC 1488 if (sc->sc_flags & SC_VJ_RESET) { 1489 /* 1490 * If we've missed a packet, we must toss subsequent compressed 1491 * packets which don't have an explicit connection ID. 1492 */ 1493 if (sc->sc_comp) 1494 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1495 s = splhigh(); /* XXX IMP ME HARDER */ 1496 sc->sc_flags &= ~SC_VJ_RESET; 1497 splx(s); 1498 } 1499 1500 /* 1501 * See if we have a VJ-compressed packet to uncompress. 1502 */ 1503 if (proto == PPP_VJC_COMP) { 1504 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1505 goto bad; 1506 1507 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1508 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1509 sc->sc_comp, &iphdr, &hlen); 1510 1511 if (xlen <= 0) { 1512 if (sc->sc_flags & SC_DEBUG) 1513 printf("%s: VJ uncompress failed on type comp\n", 1514 ifp->if_xname); 1515 goto bad; 1516 } 1517 1518 /* Copy the PPP and IP headers into a new mbuf. */ 1519 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1520 if (mp == NULL) 1521 goto bad; 1522 mp->m_len = 0; 1523 mp->m_next = NULL; 1524 if (hlen + PPP_HDRLEN > MHLEN) { 1525 MCLGET(mp, M_DONTWAIT); 1526 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1527 m_freem(mp); 1528 goto bad; /* lose if big headers and no clusters */ 1529 } 1530 } 1531 cp = mtod(mp, u_char *); 1532 cp[0] = adrs; 1533 cp[1] = ctrl; 1534 cp[2] = 0; 1535 cp[3] = PPP_IP; 1536 proto = PPP_IP; 1537 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1538 mp->m_len = hlen + PPP_HDRLEN; 1539 1540 /* 1541 * Trim the PPP and VJ headers off the old mbuf 1542 * and stick the new and old mbufs together. 1543 */ 1544 m->m_data += PPP_HDRLEN + xlen; 1545 m->m_len -= PPP_HDRLEN + xlen; 1546 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1547 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1548 mp->m_len += m->m_len; 1549 MFREE(m, mp->m_next); 1550 } else 1551 mp->m_next = m; 1552 m = mp; 1553 ilen += hlen - xlen; 1554 1555 } else if (proto == PPP_VJC_UNCOMP) { 1556 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1557 goto bad; 1558 1559 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1560 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1561 sc->sc_comp, &iphdr, &hlen); 1562 1563 if (xlen < 0) { 1564 if (sc->sc_flags & SC_DEBUG) 1565 printf("%s: VJ uncompress failed on type uncomp\n", 1566 ifp->if_xname); 1567 goto bad; 1568 } 1569 1570 proto = PPP_IP; 1571 cp[3] = PPP_IP; 1572 } 1573 #endif /* VJC */ 1574 1575 /* 1576 * If the packet will fit in a header mbuf, don't waste a 1577 * whole cluster on it. 1578 */ 1579 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1580 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1581 if (mp != NULL) { 1582 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1583 m_freem(m); 1584 m = mp; 1585 m->m_len = ilen; 1586 } 1587 } 1588 m->m_pkthdr.len = ilen; 1589 m->m_pkthdr.rcvif = ifp; 1590 1591 if ((proto & 0x8000) == 0) { 1592 #ifdef PPP_FILTER 1593 /* 1594 * See whether we want to pass this packet, and 1595 * if it counts as link activity. 1596 */ 1597 if (sc->sc_pass_filt_in.bf_insns != 0 1598 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1599 ilen, 0) == 0) { 1600 /* drop this packet */ 1601 m_freem(m); 1602 return; 1603 } 1604 if (sc->sc_active_filt_in.bf_insns == 0 1605 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1606 ilen, 0)) 1607 sc->sc_last_recv = time.tv_sec; 1608 #else 1609 /* 1610 * Record the time that we received this packet. 1611 */ 1612 sc->sc_last_recv = time.tv_sec; 1613 #endif /* PPP_FILTER */ 1614 } 1615 1616 #if NBPFILTER > 0 1617 /* See if bpf wants to look at the packet. */ 1618 if (sc->sc_if.if_bpf) 1619 bpf_mtap(sc->sc_if.if_bpf, m); 1620 #endif 1621 1622 rv = 0; 1623 switch (proto) { 1624 #ifdef INET 1625 case PPP_IP: 1626 /* 1627 * IP packet - take off the ppp header and pass it up to IP. 1628 */ 1629 if ((ifp->if_flags & IFF_UP) == 0 1630 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1631 /* interface is down - drop the packet. */ 1632 m_freem(m); 1633 return; 1634 } 1635 m->m_pkthdr.len -= PPP_HDRLEN; 1636 m->m_data += PPP_HDRLEN; 1637 m->m_len -= PPP_HDRLEN; 1638 #ifdef GATEWAY 1639 if (ipflow_fastforward(m)) 1640 return; 1641 #endif 1642 schednetisr(NETISR_IP); 1643 inq = &ipintrq; 1644 break; 1645 #endif 1646 1647 #ifdef INET6 1648 case PPP_IPV6: 1649 /* 1650 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1651 */ 1652 if ((ifp->if_flags & IFF_UP) == 0 1653 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1654 /* interface is down - drop the packet. */ 1655 m_freem(m); 1656 return; 1657 } 1658 m->m_pkthdr.len -= PPP_HDRLEN; 1659 m->m_data += PPP_HDRLEN; 1660 m->m_len -= PPP_HDRLEN; 1661 schednetisr(NETISR_IPV6); 1662 inq = &ip6intrq; 1663 break; 1664 #endif 1665 1666 default: 1667 /* 1668 * Some other protocol - place on input queue for read(). 1669 */ 1670 inq = &sc->sc_inq; 1671 rv = 1; 1672 break; 1673 } 1674 1675 /* 1676 * Put the packet on the appropriate input queue. 1677 */ 1678 s = splnet(); 1679 if (IF_QFULL(inq)) { 1680 IF_DROP(inq); 1681 splx(s); 1682 if (sc->sc_flags & SC_DEBUG) 1683 printf("%s: input queue full\n", ifp->if_xname); 1684 ifp->if_iqdrops++; 1685 goto bad; 1686 } 1687 IF_ENQUEUE(inq, m); 1688 splx(s); 1689 ifp->if_ipackets++; 1690 ifp->if_ibytes += ilen; 1691 1692 if (rv) 1693 (*sc->sc_ctlp)(sc); 1694 1695 return; 1696 1697 bad: 1698 m_freem(m); 1699 sc->sc_if.if_ierrors++; 1700 sc->sc_stats.ppp_ierrors++; 1701 } 1702 1703 #define MAX_DUMP_BYTES 128 1704 1705 static void 1706 pppdumpm(m0) 1707 struct mbuf *m0; 1708 { 1709 char buf[3*MAX_DUMP_BYTES+4]; 1710 char *bp = buf; 1711 struct mbuf *m; 1712 static char digits[] = "0123456789abcdef"; 1713 1714 for (m = m0; m; m = m->m_next) { 1715 int l = m->m_len; 1716 u_char *rptr = (u_char *)m->m_data; 1717 1718 while (l--) { 1719 if (bp > buf + sizeof(buf) - 4) 1720 goto done; 1721 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ 1722 *bp++ = digits[*rptr++ & 0xf]; 1723 } 1724 1725 if (m->m_next) { 1726 if (bp > buf + sizeof(buf) - 3) 1727 goto done; 1728 *bp++ = '|'; 1729 } else 1730 *bp++ = ' '; 1731 } 1732 done: 1733 if (m) 1734 *bp++ = '>'; 1735 *bp = 0; 1736 printf("%s\n", buf); 1737 } 1738 1739 #ifdef ALTQ 1740 /* 1741 * a wrapper to transmit a packet from if_start since ALTQ uses 1742 * if_start to send a packet. 1743 */ 1744 static void 1745 ppp_ifstart(ifp) 1746 struct ifnet *ifp; 1747 { 1748 struct ppp_softc *sc; 1749 1750 sc = ifp->if_softc; 1751 (*sc->sc_start)(sc); 1752 } 1753 #endif 1754
Indexes created Wed Sep 24 15:09:51 GMT 2025