if_ppp.c revision 1.120
1 /* $NetBSD: if_ppp.c,v 1.120 2008/01/04 21:18:15 ad 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 1.120 2008/01/04 21:18:15 ad 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 #include <sys/conf.h> 128 #include <sys/kauth.h> 129 #include <sys/intr.h> 130 #include <sys/simplelock.h> 131 132 #include <net/if.h> 133 #include <net/if_types.h> 134 #include <net/netisr.h> 135 #include <net/route.h> 136 #ifdef PPP_FILTER 137 #include <net/bpf.h> 138 #endif 139 140 #include <netinet/in.h> 141 #include <netinet/in_systm.h> 142 #include <netinet/in_var.h> 143 #ifdef INET 144 #include <netinet/ip.h> 145 #endif 146 147 #include "bpfilter.h" 148 #if NBPFILTER > 0 149 #include <net/bpf.h> 150 #endif 151 152 #if defined(PPP_FILTER) || NBPFILTER > 0 153 #include <net/slip.h> 154 #endif 155 156 #ifdef VJC 157 #include <net/slcompress.h> 158 #endif 159 160 #include <net/ppp_defs.h> 161 #include <net/if_ppp.h> 162 #include <net/if_pppvar.h> 163 #include <sys/cpu.h> 164 165 #ifdef PPP_COMPRESS 166 #define PACKETPTR struct mbuf * 167 #include <net/ppp-comp.h> 168 #endif 169 170 static int pppsioctl(struct ifnet *, u_long, void *); 171 static void ppp_requeue(struct ppp_softc *); 172 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 173 static void ppp_ccp_closed(struct ppp_softc *); 174 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 175 static void pppdumpm(struct mbuf *m0); 176 #ifdef ALTQ 177 static void ppp_ifstart(struct ifnet *ifp); 178 #endif 179 180 static void pppintr(void *); 181 182 /* 183 * Some useful mbuf macros not in mbuf.h. 184 */ 185 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 186 187 #define M_DATASTART(m) \ 188 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 189 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 190 191 #define M_DATASIZE(m) \ 192 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 193 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 194 195 /* 196 * We define two link layer specific mbuf flags, to mark high-priority 197 * packets for output, and received packets following lost/corrupted 198 * packets. 199 */ 200 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 201 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 202 203 static int ppp_clone_create(struct if_clone *, int); 204 static int ppp_clone_destroy(struct ifnet *); 205 206 static struct ppp_softc *ppp_create(const char *, int); 207 208 static LIST_HEAD(, ppp_softc) ppp_softc_list; 209 210 struct if_clone ppp_cloner = 211 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 212 213 static struct simplelock ppp_list_mutex = SIMPLELOCK_INITIALIZER; 214 215 #ifdef PPP_COMPRESS 216 /* 217 * List of compressors we know about. 218 * We leave some space so maybe we can modload compressors. 219 */ 220 221 extern struct compressor ppp_bsd_compress; 222 extern struct compressor ppp_deflate, ppp_deflate_draft; 223 224 struct compressor *ppp_compressors[PPP_COMPRESSORS_MAX] = { 225 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 226 &ppp_bsd_compress, 227 #endif 228 #if DO_DEFLATE && defined(PPP_DEFLATE) 229 &ppp_deflate, 230 &ppp_deflate_draft, 231 #endif 232 NULL 233 }; 234 #endif /* PPP_COMPRESS */ 235 236 237 /* 238 * Called from boot code to establish ppp interfaces. 239 */ 240 void 241 pppattach(void) 242 { 243 extern struct linesw ppp_disc; 244 245 if (ttyldisc_attach(&ppp_disc) != 0) 246 panic("pppattach"); 247 LIST_INIT(&ppp_softc_list); 248 if_clone_attach(&ppp_cloner); 249 } 250 251 static struct ppp_softc * 252 ppp_create(const char *name, int unit) 253 { 254 struct ppp_softc *sc, *sci, *scl = NULL; 255 256 MALLOC(sc, struct ppp_softc *, sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 257 258 simple_lock(&ppp_list_mutex); 259 if (unit == -1) { 260 int i = 0; 261 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 262 scl = sci; 263 if (i < sci->sc_unit) { 264 unit = i; 265 break; 266 } else { 267 #ifdef DIAGNOSTIC 268 KASSERT(i == sci->sc_unit); 269 #endif 270 i++; 271 } 272 } 273 if (unit == -1) 274 unit = i; 275 } else { 276 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 277 scl = sci; 278 if (unit < sci->sc_unit) 279 break; 280 else if (unit == sci->sc_unit) { 281 FREE(sc, M_DEVBUF); 282 return NULL; 283 } 284 } 285 } 286 287 if (sci != NULL) 288 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 289 else if (scl != NULL) 290 LIST_INSERT_AFTER(scl, sc, sc_iflist); 291 else 292 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 293 294 simple_unlock(&ppp_list_mutex); 295 296 (void)snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 297 name, sc->sc_unit = unit); 298 callout_init(&sc->sc_timo_ch, 0); 299 sc->sc_if.if_softc = sc; 300 sc->sc_if.if_mtu = PPP_MTU; 301 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 302 sc->sc_if.if_type = IFT_PPP; 303 sc->sc_if.if_hdrlen = PPP_HDRLEN; 304 sc->sc_if.if_dlt = DLT_NULL; 305 sc->sc_if.if_ioctl = pppsioctl; 306 sc->sc_if.if_output = pppoutput; 307 #ifdef ALTQ 308 sc->sc_if.if_start = ppp_ifstart; 309 #endif 310 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 311 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 312 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 313 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 314 /* Ratio of 1:2 packets between the regular and the fast queue */ 315 sc->sc_maxfastq = 2; 316 IFQ_SET_READY(&sc->sc_if.if_snd); 317 if_attach(&sc->sc_if); 318 if_alloc_sadl(&sc->sc_if); 319 #if NBPFILTER > 0 320 bpfattach(&sc->sc_if, DLT_NULL, 0); 321 #endif 322 return sc; 323 } 324 325 static int 326 ppp_clone_create(struct if_clone *ifc, int unit) 327 { 328 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 329 } 330 331 static int 332 ppp_clone_destroy(struct ifnet *ifp) 333 { 334 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 335 336 if (sc->sc_devp != NULL) 337 return EBUSY; /* Not removing it */ 338 339 simple_lock(&ppp_list_mutex); 340 LIST_REMOVE(sc, sc_iflist); 341 simple_unlock(&ppp_list_mutex); 342 343 #if NBPFILTER > 0 344 bpfdetach(ifp); 345 #endif 346 if_detach(ifp); 347 348 FREE(sc, M_DEVBUF); 349 return 0; 350 } 351 352 /* 353 * Allocate a ppp interface unit and initialize it. 354 */ 355 struct ppp_softc * 356 pppalloc(pid_t pid) 357 { 358 struct ppp_softc *sc = NULL, *scf; 359 int i; 360 361 simple_lock(&ppp_list_mutex); 362 for (scf = LIST_FIRST(&ppp_softc_list); scf != NULL; 363 scf = LIST_NEXT(scf, sc_iflist)) { 364 if (scf->sc_xfer == pid) { 365 scf->sc_xfer = 0; 366 simple_unlock(&ppp_list_mutex); 367 return scf; 368 } 369 if (scf->sc_devp == NULL && sc == NULL) 370 sc = scf; 371 } 372 simple_unlock(&ppp_list_mutex); 373 374 if (sc == NULL) 375 sc = ppp_create(ppp_cloner.ifc_name, -1); 376 377 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 378 if (sc->sc_si == NULL) { 379 printf("%s: unable to establish softintr\n", sc->sc_if.if_xname); 380 return (NULL); 381 } 382 sc->sc_flags = 0; 383 sc->sc_mru = PPP_MRU; 384 sc->sc_relinq = NULL; 385 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 386 #ifdef VJC 387 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 388 M_DEVBUF, M_NOWAIT); 389 if (sc->sc_comp) 390 sl_compress_init(sc->sc_comp); 391 #endif 392 #ifdef PPP_COMPRESS 393 sc->sc_xc_state = NULL; 394 sc->sc_rc_state = NULL; 395 #endif /* PPP_COMPRESS */ 396 for (i = 0; i < NUM_NP; ++i) 397 sc->sc_npmode[i] = NPMODE_ERROR; 398 sc->sc_npqueue = NULL; 399 sc->sc_npqtail = &sc->sc_npqueue; 400 sc->sc_last_sent = sc->sc_last_recv = time_second; 401 402 return sc; 403 } 404 405 /* 406 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 407 */ 408 void 409 pppdealloc(struct ppp_softc *sc) 410 { 411 struct mbuf *m; 412 413 softint_disestablish(sc->sc_si); 414 if_down(&sc->sc_if); 415 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 416 sc->sc_devp = NULL; 417 sc->sc_xfer = 0; 418 for (;;) { 419 IF_DEQUEUE(&sc->sc_rawq, m); 420 if (m == NULL) 421 break; 422 m_freem(m); 423 } 424 for (;;) { 425 IF_DEQUEUE(&sc->sc_inq, m); 426 if (m == NULL) 427 break; 428 m_freem(m); 429 } 430 for (;;) { 431 IF_DEQUEUE(&sc->sc_fastq, m); 432 if (m == NULL) 433 break; 434 m_freem(m); 435 } 436 while ((m = sc->sc_npqueue) != NULL) { 437 sc->sc_npqueue = m->m_nextpkt; 438 m_freem(m); 439 } 440 if (sc->sc_togo != NULL) { 441 m_freem(sc->sc_togo); 442 sc->sc_togo = NULL; 443 } 444 #ifdef PPP_COMPRESS 445 ppp_ccp_closed(sc); 446 sc->sc_xc_state = NULL; 447 sc->sc_rc_state = NULL; 448 #endif /* PPP_COMPRESS */ 449 #ifdef PPP_FILTER 450 if (sc->sc_pass_filt_in.bf_insns != 0) { 451 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 452 sc->sc_pass_filt_in.bf_insns = 0; 453 sc->sc_pass_filt_in.bf_len = 0; 454 } 455 if (sc->sc_pass_filt_out.bf_insns != 0) { 456 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 457 sc->sc_pass_filt_out.bf_insns = 0; 458 sc->sc_pass_filt_out.bf_len = 0; 459 } 460 if (sc->sc_active_filt_in.bf_insns != 0) { 461 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 462 sc->sc_active_filt_in.bf_insns = 0; 463 sc->sc_active_filt_in.bf_len = 0; 464 } 465 if (sc->sc_active_filt_out.bf_insns != 0) { 466 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 467 sc->sc_active_filt_out.bf_insns = 0; 468 sc->sc_active_filt_out.bf_len = 0; 469 } 470 #endif /* PPP_FILTER */ 471 #ifdef VJC 472 if (sc->sc_comp != 0) { 473 FREE(sc->sc_comp, M_DEVBUF); 474 sc->sc_comp = 0; 475 } 476 #endif 477 (void)ppp_clone_destroy(&sc->sc_if); 478 } 479 480 /* 481 * Ioctl routine for generic ppp devices. 482 */ 483 int 484 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 485 struct lwp *l) 486 { 487 int s, error, flags, mru, npx; 488 u_int nb; 489 struct ppp_option_data *odp; 490 struct compressor **cp; 491 struct npioctl *npi; 492 time_t t; 493 #ifdef PPP_FILTER 494 struct bpf_program *bp, *nbp; 495 struct bpf_insn *newcode, *oldcode; 496 int newcodelen; 497 #endif /* PPP_FILTER */ 498 #ifdef PPP_COMPRESS 499 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 500 #endif 501 502 switch (cmd) { 503 case PPPIOCSFLAGS: 504 case PPPIOCSMRU: 505 case PPPIOCSMAXCID: 506 case PPPIOCSCOMPRESS: 507 case PPPIOCSNPMODE: 508 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 509 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, (void *)cmd, 510 NULL) != 0) 511 return (EPERM); 512 break; 513 case PPPIOCXFERUNIT: 514 /* XXX: Why is this privileged?! */ 515 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 516 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, (void *)cmd, 517 NULL) != 0) 518 return (EPERM); 519 break; 520 default: 521 break; 522 } 523 524 switch (cmd) { 525 case FIONREAD: 526 *(int *)data = sc->sc_inq.ifq_len; 527 break; 528 529 case PPPIOCGUNIT: 530 *(int *)data = sc->sc_unit; 531 break; 532 533 case PPPIOCGFLAGS: 534 *(u_int *)data = sc->sc_flags; 535 break; 536 537 case PPPIOCGRAWIN: 538 { 539 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 540 u_char c, q = 0; 541 542 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 543 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 544 545 for (c = 0; c < sc->sc_rawin_start;) 546 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 547 548 rwin->count = sc->sc_rawin.count; 549 } 550 break; 551 552 case PPPIOCSFLAGS: 553 flags = *(int *)data & SC_MASK; 554 s = splsoftnet(); 555 #ifdef PPP_COMPRESS 556 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 557 ppp_ccp_closed(sc); 558 #endif 559 splhigh(); /* XXX IMP ME HARDER */ 560 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 561 splx(s); 562 break; 563 564 case PPPIOCSMRU: 565 mru = *(int *)data; 566 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 567 sc->sc_mru = mru; 568 break; 569 570 case PPPIOCGMRU: 571 *(int *)data = sc->sc_mru; 572 break; 573 574 #ifdef VJC 575 case PPPIOCSMAXCID: 576 if (sc->sc_comp) { 577 s = splsoftnet(); 578 sl_compress_setup(sc->sc_comp, *(int *)data); 579 splx(s); 580 } 581 break; 582 #endif 583 584 case PPPIOCXFERUNIT: 585 sc->sc_xfer = l->l_proc->p_pid; 586 break; 587 588 #ifdef PPP_COMPRESS 589 case PPPIOCSCOMPRESS: 590 odp = (struct ppp_option_data *) data; 591 nb = odp->length; 592 if (nb > sizeof(ccp_option)) 593 nb = sizeof(ccp_option); 594 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 595 return (error); 596 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 597 return (EINVAL); 598 for (cp = ppp_compressors; *cp != NULL; ++cp) 599 if ((*cp)->compress_proto == ccp_option[0]) { 600 /* 601 * Found a handler for the protocol - try to allocate 602 * a compressor or decompressor. 603 */ 604 error = 0; 605 if (odp->transmit) { 606 s = splsoftnet(); 607 if (sc->sc_xc_state != NULL) 608 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 609 sc->sc_xcomp = *cp; 610 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 611 if (sc->sc_xc_state == NULL) { 612 if (sc->sc_flags & SC_DEBUG) 613 printf("%s: comp_alloc failed\n", 614 sc->sc_if.if_xname); 615 error = ENOBUFS; 616 } 617 splhigh(); /* XXX IMP ME HARDER */ 618 sc->sc_flags &= ~SC_COMP_RUN; 619 splx(s); 620 } else { 621 s = splsoftnet(); 622 if (sc->sc_rc_state != NULL) 623 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 624 sc->sc_rcomp = *cp; 625 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); 626 if (sc->sc_rc_state == NULL) { 627 if (sc->sc_flags & SC_DEBUG) 628 printf("%s: decomp_alloc failed\n", 629 sc->sc_if.if_xname); 630 error = ENOBUFS; 631 } 632 splhigh(); /* XXX IMP ME HARDER */ 633 sc->sc_flags &= ~SC_DECOMP_RUN; 634 splx(s); 635 } 636 return (error); 637 } 638 if (sc->sc_flags & SC_DEBUG) 639 printf("%s: no compressor for [%x %x %x], %x\n", 640 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 641 ccp_option[2], nb); 642 return (EINVAL); /* no handler found */ 643 #endif /* PPP_COMPRESS */ 644 645 case PPPIOCGNPMODE: 646 case PPPIOCSNPMODE: 647 npi = (struct npioctl *) data; 648 switch (npi->protocol) { 649 case PPP_IP: 650 npx = NP_IP; 651 break; 652 case PPP_IPV6: 653 npx = NP_IPV6; 654 break; 655 default: 656 return EINVAL; 657 } 658 if (cmd == PPPIOCGNPMODE) { 659 npi->mode = sc->sc_npmode[npx]; 660 } else { 661 if (npi->mode != sc->sc_npmode[npx]) { 662 s = splnet(); 663 sc->sc_npmode[npx] = npi->mode; 664 if (npi->mode != NPMODE_QUEUE) { 665 ppp_requeue(sc); 666 ppp_restart(sc); 667 } 668 splx(s); 669 } 670 } 671 break; 672 673 case PPPIOCGIDLE: 674 s = splsoftnet(); 675 t = time_second; 676 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 677 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 678 splx(s); 679 break; 680 681 #ifdef PPP_FILTER 682 case PPPIOCSPASS: 683 case PPPIOCSACTIVE: 684 /* These are no longer supported. */ 685 return EOPNOTSUPP; 686 687 case PPPIOCSIPASS: 688 case PPPIOCSOPASS: 689 case PPPIOCSIACTIVE: 690 case PPPIOCSOACTIVE: 691 nbp = (struct bpf_program *) data; 692 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 693 return EINVAL; 694 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 695 if (newcodelen != 0) { 696 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 697 /* WAITOK -- malloc() never fails. */ 698 if ((error = copyin((void *)nbp->bf_insns, (void *)newcode, 699 newcodelen)) != 0) { 700 free(newcode, M_DEVBUF); 701 return error; 702 } 703 if (!bpf_validate(newcode, nbp->bf_len)) { 704 free(newcode, M_DEVBUF); 705 return EINVAL; 706 } 707 } else 708 newcode = 0; 709 switch (cmd) { 710 case PPPIOCSIPASS: 711 bp = &sc->sc_pass_filt_in; 712 break; 713 714 case PPPIOCSOPASS: 715 bp = &sc->sc_pass_filt_out; 716 break; 717 718 case PPPIOCSIACTIVE: 719 bp = &sc->sc_active_filt_in; 720 break; 721 722 case PPPIOCSOACTIVE: 723 bp = &sc->sc_active_filt_out; 724 break; 725 default: 726 free(newcode, M_DEVBUF); 727 return (EPASSTHROUGH); 728 } 729 oldcode = bp->bf_insns; 730 s = splnet(); 731 bp->bf_len = nbp->bf_len; 732 bp->bf_insns = newcode; 733 splx(s); 734 if (oldcode != 0) 735 free(oldcode, M_DEVBUF); 736 break; 737 #endif /* PPP_FILTER */ 738 739 default: 740 return (EPASSTHROUGH); 741 } 742 return (0); 743 } 744 745 /* 746 * Process an ioctl request to the ppp network interface. 747 */ 748 static int 749 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 750 { 751 struct lwp *l = curlwp; /* XXX */ 752 struct ppp_softc *sc = ifp->if_softc; 753 struct ifaddr *ifa = (struct ifaddr *)data; 754 struct ifreq *ifr = (struct ifreq *)data; 755 struct ppp_stats *psp; 756 #ifdef PPP_COMPRESS 757 struct ppp_comp_stats *pcp; 758 #endif 759 int s = splnet(), error = 0; 760 761 switch (cmd) { 762 case SIOCSIFFLAGS: 763 if ((ifp->if_flags & IFF_RUNNING) == 0) 764 ifp->if_flags &= ~IFF_UP; 765 break; 766 767 case SIOCSIFADDR: 768 switch (ifa->ifa_addr->sa_family) { 769 #ifdef INET 770 case AF_INET: 771 break; 772 #endif 773 #ifdef INET6 774 case AF_INET6: 775 break; 776 #endif 777 default: 778 error = EAFNOSUPPORT; 779 break; 780 } 781 break; 782 783 case SIOCSIFDSTADDR: 784 switch (ifa->ifa_addr->sa_family) { 785 #ifdef INET 786 case AF_INET: 787 break; 788 #endif 789 #ifdef INET6 790 case AF_INET6: 791 break; 792 #endif 793 default: 794 error = EAFNOSUPPORT; 795 break; 796 } 797 break; 798 799 case SIOCSIFMTU: 800 if ((error = kauth_authorize_network(l->l_cred, 801 KAUTH_NETWORK_INTERFACE, KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, 802 ifp, (void *)cmd, NULL) != 0)) 803 break; 804 sc->sc_if.if_mtu = ifr->ifr_mtu; 805 break; 806 807 case SIOCGIFMTU: 808 ifr->ifr_mtu = sc->sc_if.if_mtu; 809 break; 810 811 case SIOCADDMULTI: 812 case SIOCDELMULTI: 813 if (ifr == NULL) { 814 error = EAFNOSUPPORT; 815 break; 816 } 817 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 818 #ifdef INET 819 case AF_INET: 820 break; 821 #endif 822 #ifdef INET6 823 case AF_INET6: 824 break; 825 #endif 826 default: 827 error = EAFNOSUPPORT; 828 break; 829 } 830 break; 831 832 case SIOCGPPPSTATS: 833 psp = &((struct ifpppstatsreq *) data)->stats; 834 memset(psp, 0, sizeof(*psp)); 835 psp->p = sc->sc_stats; 836 #if defined(VJC) && !defined(SL_NO_STATS) 837 if (sc->sc_comp) { 838 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 839 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 840 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 841 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 842 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 843 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 844 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 845 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 846 } 847 #endif /* VJC */ 848 break; 849 850 #ifdef PPP_COMPRESS 851 case SIOCGPPPCSTATS: 852 pcp = &((struct ifpppcstatsreq *) data)->stats; 853 memset(pcp, 0, sizeof(*pcp)); 854 if (sc->sc_xc_state != NULL) 855 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 856 if (sc->sc_rc_state != NULL) 857 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 858 break; 859 #endif /* PPP_COMPRESS */ 860 861 default: 862 error = EINVAL; 863 } 864 splx(s); 865 return (error); 866 } 867 868 /* 869 * Queue a packet. Start transmission if not active. 870 * Packet is placed in Information field of PPP frame. 871 */ 872 int 873 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 874 struct rtentry *rtp) 875 { 876 struct ppp_softc *sc = ifp->if_softc; 877 int protocol, address, control; 878 u_char *cp; 879 int s, error; 880 #ifdef INET 881 struct ip *ip; 882 #endif 883 struct ifqueue *ifq; 884 enum NPmode mode; 885 int len; 886 ALTQ_DECL(struct altq_pktattr pktattr;) 887 888 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 889 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 890 error = ENETDOWN; /* sort of */ 891 goto bad; 892 } 893 894 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 895 896 /* 897 * Compute PPP header. 898 */ 899 m0->m_flags &= ~M_HIGHPRI; 900 switch (dst->sa_family) { 901 #ifdef INET 902 case AF_INET: 903 address = PPP_ALLSTATIONS; 904 control = PPP_UI; 905 protocol = PPP_IP; 906 mode = sc->sc_npmode[NP_IP]; 907 908 /* 909 * If this packet has the "low delay" bit set in the IP header, 910 * put it on the fastq instead. 911 */ 912 ip = mtod(m0, struct ip *); 913 if (ip->ip_tos & IPTOS_LOWDELAY) 914 m0->m_flags |= M_HIGHPRI; 915 break; 916 #endif 917 #ifdef INET6 918 case AF_INET6: 919 address = PPP_ALLSTATIONS; /*XXX*/ 920 control = PPP_UI; /*XXX*/ 921 protocol = PPP_IPV6; 922 mode = sc->sc_npmode[NP_IPV6]; 923 924 #if 0 /* XXX flowinfo/traffic class, maybe? */ 925 /* 926 * If this packet has the "low delay" bit set in the IP header, 927 * put it on the fastq instead. 928 */ 929 ip = mtod(m0, struct ip *); 930 if (ip->ip_tos & IPTOS_LOWDELAY) 931 m0->m_flags |= M_HIGHPRI; 932 #endif 933 break; 934 #endif 935 case AF_UNSPEC: 936 address = PPP_ADDRESS(dst->sa_data); 937 control = PPP_CONTROL(dst->sa_data); 938 protocol = PPP_PROTOCOL(dst->sa_data); 939 mode = NPMODE_PASS; 940 break; 941 default: 942 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 943 error = EAFNOSUPPORT; 944 goto bad; 945 } 946 947 /* 948 * Drop this packet, or return an error, if necessary. 949 */ 950 if (mode == NPMODE_ERROR) { 951 error = ENETDOWN; 952 goto bad; 953 } 954 if (mode == NPMODE_DROP) { 955 error = 0; 956 goto bad; 957 } 958 959 /* 960 * Add PPP header. 961 */ 962 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 963 if (m0 == NULL) { 964 error = ENOBUFS; 965 goto bad; 966 } 967 968 cp = mtod(m0, u_char *); 969 *cp++ = address; 970 *cp++ = control; 971 *cp++ = protocol >> 8; 972 *cp++ = protocol & 0xff; 973 974 len = m_length(m0); 975 976 if (sc->sc_flags & SC_LOG_OUTPKT) { 977 printf("%s output: ", ifp->if_xname); 978 pppdumpm(m0); 979 } 980 981 if ((protocol & 0x8000) == 0) { 982 #ifdef PPP_FILTER 983 /* 984 * Apply the pass and active filters to the packet, 985 * but only if it is a data packet. 986 */ 987 if (sc->sc_pass_filt_out.bf_insns != 0 988 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 989 len, 0) == 0) { 990 error = 0; /* drop this packet */ 991 goto bad; 992 } 993 994 /* 995 * Update the time we sent the most recent packet. 996 */ 997 if (sc->sc_active_filt_out.bf_insns == 0 998 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 999 len, 0)) 1000 sc->sc_last_sent = time_second; 1001 #else 1002 /* 1003 * Update the time we sent the most recent packet. 1004 */ 1005 sc->sc_last_sent = time_second; 1006 #endif /* PPP_FILTER */ 1007 } 1008 1009 #if NBPFILTER > 0 1010 /* 1011 * See if bpf wants to look at the packet. 1012 */ 1013 if (sc->sc_if.if_bpf) 1014 bpf_mtap(sc->sc_if.if_bpf, m0); 1015 #endif 1016 1017 /* 1018 * Put the packet on the appropriate queue. 1019 */ 1020 s = splnet(); 1021 if (mode == NPMODE_QUEUE) { 1022 /* XXX we should limit the number of packets on this queue */ 1023 *sc->sc_npqtail = m0; 1024 m0->m_nextpkt = NULL; 1025 sc->sc_npqtail = &m0->m_nextpkt; 1026 } else { 1027 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1028 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 1029 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { 1030 splx(s); 1031 sc->sc_if.if_oerrors++; 1032 sc->sc_stats.ppp_oerrors++; 1033 return (error); 1034 } 1035 ppp_restart(sc); 1036 } 1037 ifp->if_opackets++; 1038 ifp->if_obytes += len; 1039 1040 splx(s); 1041 return (0); 1042 1043 bad: 1044 m_freem(m0); 1045 return (error); 1046 } 1047 1048 /* 1049 * After a change in the NPmode for some NP, move packets from the 1050 * npqueue to the send queue or the fast queue as appropriate. 1051 * Should be called at splnet, since we muck with the queues. 1052 */ 1053 static void 1054 ppp_requeue(struct ppp_softc *sc) 1055 { 1056 struct mbuf *m, **mpp; 1057 struct ifqueue *ifq; 1058 enum NPmode mode; 1059 int error; 1060 1061 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1062 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1063 case PPP_IP: 1064 mode = sc->sc_npmode[NP_IP]; 1065 break; 1066 case PPP_IPV6: 1067 mode = sc->sc_npmode[NP_IPV6]; 1068 break; 1069 default: 1070 mode = NPMODE_PASS; 1071 } 1072 1073 switch (mode) { 1074 case NPMODE_PASS: 1075 /* 1076 * This packet can now go on one of the queues to be sent. 1077 */ 1078 *mpp = m->m_nextpkt; 1079 m->m_nextpkt = NULL; 1080 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1081 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA 1082 ALTQ_DECL(NULL))) != 0) { 1083 sc->sc_if.if_oerrors++; 1084 sc->sc_stats.ppp_oerrors++; 1085 } 1086 break; 1087 1088 case NPMODE_DROP: 1089 case NPMODE_ERROR: 1090 *mpp = m->m_nextpkt; 1091 m_freem(m); 1092 break; 1093 1094 case NPMODE_QUEUE: 1095 mpp = &m->m_nextpkt; 1096 break; 1097 } 1098 } 1099 sc->sc_npqtail = mpp; 1100 } 1101 1102 /* 1103 * Transmitter has finished outputting some stuff; 1104 * remember to call sc->sc_start later at splsoftnet. 1105 */ 1106 void 1107 ppp_restart(struct ppp_softc *sc) 1108 { 1109 int s = splhigh(); /* XXX IMP ME HARDER */ 1110 1111 sc->sc_flags &= ~SC_TBUSY; 1112 softint_schedule(sc->sc_si); 1113 splx(s); 1114 } 1115 1116 /* 1117 * Get a packet to send. This procedure is intended to be called at 1118 * splsoftnet, since it may involve time-consuming operations such as 1119 * applying VJ compression, packet compression, address/control and/or 1120 * protocol field compression to the packet. 1121 */ 1122 struct mbuf * 1123 ppp_dequeue(struct ppp_softc *sc) 1124 { 1125 struct mbuf *m, *mp; 1126 u_char *cp; 1127 int address, control, protocol; 1128 int s; 1129 1130 /* 1131 * Grab a packet to send: first try the fast queue, then the 1132 * normal queue. 1133 */ 1134 s = splnet(); 1135 if (sc->sc_nfastq < sc->sc_maxfastq) { 1136 IF_DEQUEUE(&sc->sc_fastq, m); 1137 if (m != NULL) 1138 sc->sc_nfastq++; 1139 else 1140 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1141 } else { 1142 sc->sc_nfastq = 0; 1143 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1144 if (m == NULL) { 1145 IF_DEQUEUE(&sc->sc_fastq, m); 1146 if (m != NULL) 1147 sc->sc_nfastq++; 1148 } 1149 } 1150 splx(s); 1151 1152 if (m == NULL) 1153 return NULL; 1154 1155 ++sc->sc_stats.ppp_opackets; 1156 1157 /* 1158 * Extract the ppp header of the new packet. 1159 * The ppp header will be in one mbuf. 1160 */ 1161 cp = mtod(m, u_char *); 1162 address = PPP_ADDRESS(cp); 1163 control = PPP_CONTROL(cp); 1164 protocol = PPP_PROTOCOL(cp); 1165 1166 switch (protocol) { 1167 case PPP_IP: 1168 #ifdef VJC 1169 /* 1170 * If the packet is a TCP/IP packet, see if we can compress it. 1171 */ 1172 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1173 struct ip *ip; 1174 int type; 1175 1176 mp = m; 1177 ip = (struct ip *) (cp + PPP_HDRLEN); 1178 if (mp->m_len <= PPP_HDRLEN) { 1179 mp = mp->m_next; 1180 if (mp == NULL) 1181 break; 1182 ip = mtod(mp, struct ip *); 1183 } 1184 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1185 if (ip->ip_p == IPPROTO_TCP) { 1186 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1187 !(sc->sc_flags & SC_NO_TCP_CCID)); 1188 switch (type) { 1189 case TYPE_UNCOMPRESSED_TCP: 1190 protocol = PPP_VJC_UNCOMP; 1191 break; 1192 case TYPE_COMPRESSED_TCP: 1193 protocol = PPP_VJC_COMP; 1194 cp = mtod(m, u_char *); 1195 cp[0] = address; /* header has moved */ 1196 cp[1] = control; 1197 cp[2] = 0; 1198 break; 1199 } 1200 cp[3] = protocol; /* update protocol in PPP header */ 1201 } 1202 } 1203 #endif /* VJC */ 1204 break; 1205 1206 #ifdef PPP_COMPRESS 1207 case PPP_CCP: 1208 ppp_ccp(sc, m, 0); 1209 break; 1210 #endif /* PPP_COMPRESS */ 1211 } 1212 1213 #ifdef PPP_COMPRESS 1214 if (protocol != PPP_LCP && protocol != PPP_CCP 1215 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1216 struct mbuf *mcomp = NULL; 1217 int slen; 1218 1219 slen = 0; 1220 for (mp = m; mp != NULL; mp = mp->m_next) 1221 slen += mp->m_len; 1222 (*sc->sc_xcomp->compress) 1223 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1224 if (mcomp != NULL) { 1225 if (sc->sc_flags & SC_CCP_UP) { 1226 /* Send the compressed packet instead of the original. */ 1227 m_freem(m); 1228 m = mcomp; 1229 cp = mtod(m, u_char *); 1230 protocol = cp[3]; 1231 } else { 1232 /* Can't transmit compressed packets until CCP is up. */ 1233 m_freem(mcomp); 1234 } 1235 } 1236 } 1237 #endif /* PPP_COMPRESS */ 1238 1239 /* 1240 * Compress the address/control and protocol, if possible. 1241 */ 1242 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1243 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1244 protocol != PPP_LCP) { 1245 /* can compress address/control */ 1246 m->m_data += 2; 1247 m->m_len -= 2; 1248 } 1249 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1250 /* can compress protocol */ 1251 if (mtod(m, u_char *) == cp) { 1252 cp[2] = cp[1]; /* move address/control up */ 1253 cp[1] = cp[0]; 1254 } 1255 ++m->m_data; 1256 --m->m_len; 1257 } 1258 1259 return m; 1260 } 1261 1262 /* 1263 * Software interrupt routine, called at splsoftnet. 1264 */ 1265 static void 1266 pppintr(void *arg) 1267 { 1268 struct ppp_softc *sc = arg; 1269 struct mbuf *m; 1270 int s; 1271 1272 if (!(sc->sc_flags & SC_TBUSY) 1273 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1274 || sc->sc_outm)) { 1275 s = splhigh(); /* XXX IMP ME HARDER */ 1276 sc->sc_flags |= SC_TBUSY; 1277 splx(s); 1278 (*sc->sc_start)(sc); 1279 } 1280 for (;;) { 1281 s = splnet(); 1282 IF_DEQUEUE(&sc->sc_rawq, m); 1283 splx(s); 1284 if (m == NULL) 1285 break; 1286 ppp_inproc(sc, m); 1287 } 1288 } 1289 1290 #ifdef PPP_COMPRESS 1291 /* 1292 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1293 * 0 if it is about to be transmitted. 1294 */ 1295 static void 1296 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1297 { 1298 u_char *dp, *ep; 1299 struct mbuf *mp; 1300 int slen, s; 1301 1302 /* 1303 * Get a pointer to the data after the PPP header. 1304 */ 1305 if (m->m_len <= PPP_HDRLEN) { 1306 mp = m->m_next; 1307 if (mp == NULL) 1308 return; 1309 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1310 } else { 1311 mp = m; 1312 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1313 } 1314 1315 ep = mtod(mp, u_char *) + mp->m_len; 1316 if (dp + CCP_HDRLEN > ep) 1317 return; 1318 slen = CCP_LENGTH(dp); 1319 if (dp + slen > ep) { 1320 if (sc->sc_flags & SC_DEBUG) 1321 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1322 dp, slen, mtod(mp, u_char *), mp->m_len); 1323 return; 1324 } 1325 1326 switch (CCP_CODE(dp)) { 1327 case CCP_CONFREQ: 1328 case CCP_TERMREQ: 1329 case CCP_TERMACK: 1330 /* CCP must be going down - disable compression */ 1331 if (sc->sc_flags & SC_CCP_UP) { 1332 s = splhigh(); /* XXX IMP ME HARDER */ 1333 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1334 splx(s); 1335 } 1336 break; 1337 1338 case CCP_CONFACK: 1339 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1340 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1341 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1342 if (!rcvd) { 1343 /* we're agreeing to send compressed packets. */ 1344 if (sc->sc_xc_state != NULL 1345 && (*sc->sc_xcomp->comp_init) 1346 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1347 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1348 s = splhigh(); /* XXX IMP ME HARDER */ 1349 sc->sc_flags |= SC_COMP_RUN; 1350 splx(s); 1351 } 1352 } else { 1353 /* peer is agreeing to send compressed packets. */ 1354 if (sc->sc_rc_state != NULL 1355 && (*sc->sc_rcomp->decomp_init) 1356 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1357 sc->sc_unit, 0, sc->sc_mru, 1358 sc->sc_flags & SC_DEBUG)) { 1359 s = splhigh(); /* XXX IMP ME HARDER */ 1360 sc->sc_flags |= SC_DECOMP_RUN; 1361 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1362 splx(s); 1363 } 1364 } 1365 } 1366 break; 1367 1368 case CCP_RESETACK: 1369 if (sc->sc_flags & SC_CCP_UP) { 1370 if (!rcvd) { 1371 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1372 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1373 } else { 1374 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1375 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1376 s = splhigh(); /* XXX IMP ME HARDER */ 1377 sc->sc_flags &= ~SC_DC_ERROR; 1378 splx(s); 1379 } 1380 } 1381 } 1382 break; 1383 } 1384 } 1385 1386 /* 1387 * CCP is down; free (de)compressor state if necessary. 1388 */ 1389 static void 1390 ppp_ccp_closed(struct ppp_softc *sc) 1391 { 1392 if (sc->sc_xc_state) { 1393 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1394 sc->sc_xc_state = NULL; 1395 } 1396 if (sc->sc_rc_state) { 1397 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1398 sc->sc_rc_state = NULL; 1399 } 1400 } 1401 #endif /* PPP_COMPRESS */ 1402 1403 /* 1404 * PPP packet input routine. 1405 * The caller has checked and removed the FCS and has inserted 1406 * the address/control bytes and the protocol high byte if they 1407 * were omitted. 1408 */ 1409 void 1410 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1411 { 1412 int s = splhigh(); /* XXX IMP ME HARDER */ 1413 1414 if (lost) 1415 m->m_flags |= M_ERRMARK; 1416 IF_ENQUEUE(&sc->sc_rawq, m); 1417 softint_schedule(sc->sc_si); 1418 splx(s); 1419 } 1420 1421 /* 1422 * Process a received PPP packet, doing decompression as necessary. 1423 * Should be called at splsoftnet. 1424 */ 1425 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1426 TYPE_UNCOMPRESSED_TCP) 1427 1428 static void 1429 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1430 { 1431 struct ifnet *ifp = &sc->sc_if; 1432 struct ifqueue *inq; 1433 int s, ilen, proto, rv; 1434 u_char *cp, adrs, ctrl; 1435 struct mbuf *mp, *dmp = NULL; 1436 #ifdef VJC 1437 int xlen; 1438 u_char *iphdr; 1439 u_int hlen; 1440 #endif 1441 1442 sc->sc_stats.ppp_ipackets++; 1443 1444 if (sc->sc_flags & SC_LOG_INPKT) { 1445 ilen = 0; 1446 for (mp = m; mp != NULL; mp = mp->m_next) 1447 ilen += mp->m_len; 1448 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1449 pppdumpm(m); 1450 } 1451 1452 cp = mtod(m, u_char *); 1453 adrs = PPP_ADDRESS(cp); 1454 ctrl = PPP_CONTROL(cp); 1455 proto = PPP_PROTOCOL(cp); 1456 1457 if (m->m_flags & M_ERRMARK) { 1458 m->m_flags &= ~M_ERRMARK; 1459 s = splhigh(); /* XXX IMP ME HARDER */ 1460 sc->sc_flags |= SC_VJ_RESET; 1461 splx(s); 1462 } 1463 1464 #ifdef PPP_COMPRESS 1465 /* 1466 * Decompress this packet if necessary, update the receiver's 1467 * dictionary, or take appropriate action on a CCP packet. 1468 */ 1469 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1470 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1471 /* decompress this packet */ 1472 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1473 if (rv == DECOMP_OK) { 1474 m_freem(m); 1475 if (dmp == NULL) { 1476 /* no error, but no decompressed packet produced */ 1477 return; 1478 } 1479 m = dmp; 1480 cp = mtod(m, u_char *); 1481 proto = PPP_PROTOCOL(cp); 1482 1483 } else { 1484 /* 1485 * An error has occurred in decompression. 1486 * Pass the compressed packet up to pppd, which may take 1487 * CCP down or issue a Reset-Req. 1488 */ 1489 if (sc->sc_flags & SC_DEBUG) 1490 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1491 s = splhigh(); /* XXX IMP ME HARDER */ 1492 sc->sc_flags |= SC_VJ_RESET; 1493 if (rv == DECOMP_ERROR) 1494 sc->sc_flags |= SC_DC_ERROR; 1495 else 1496 sc->sc_flags |= SC_DC_FERROR; 1497 splx(s); 1498 } 1499 1500 } else { 1501 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1502 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1503 } 1504 if (proto == PPP_CCP) { 1505 ppp_ccp(sc, m, 1); 1506 } 1507 } 1508 #endif 1509 1510 ilen = 0; 1511 for (mp = m; mp != NULL; mp = mp->m_next) 1512 ilen += mp->m_len; 1513 1514 #ifdef VJC 1515 if (sc->sc_flags & SC_VJ_RESET) { 1516 /* 1517 * If we've missed a packet, we must toss subsequent compressed 1518 * packets which don't have an explicit connection ID. 1519 */ 1520 if (sc->sc_comp) 1521 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1522 s = splhigh(); /* XXX IMP ME HARDER */ 1523 sc->sc_flags &= ~SC_VJ_RESET; 1524 splx(s); 1525 } 1526 1527 /* 1528 * See if we have a VJ-compressed packet to uncompress. 1529 */ 1530 if (proto == PPP_VJC_COMP) { 1531 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1532 goto bad; 1533 1534 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1535 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1536 sc->sc_comp, &iphdr, &hlen); 1537 1538 if (xlen <= 0) { 1539 if (sc->sc_flags & SC_DEBUG) 1540 printf("%s: VJ uncompress failed on type comp\n", 1541 ifp->if_xname); 1542 goto bad; 1543 } 1544 1545 /* Copy the PPP and IP headers into a new mbuf. */ 1546 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1547 if (mp == NULL) 1548 goto bad; 1549 mp->m_len = 0; 1550 mp->m_next = NULL; 1551 if (hlen + PPP_HDRLEN > MHLEN) { 1552 MCLGET(mp, M_DONTWAIT); 1553 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1554 m_freem(mp); 1555 goto bad; /* lose if big headers and no clusters */ 1556 } 1557 } 1558 cp = mtod(mp, u_char *); 1559 cp[0] = adrs; 1560 cp[1] = ctrl; 1561 cp[2] = 0; 1562 cp[3] = PPP_IP; 1563 proto = PPP_IP; 1564 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1565 mp->m_len = hlen + PPP_HDRLEN; 1566 1567 /* 1568 * Trim the PPP and VJ headers off the old mbuf 1569 * and stick the new and old mbufs together. 1570 */ 1571 m->m_data += PPP_HDRLEN + xlen; 1572 m->m_len -= PPP_HDRLEN + xlen; 1573 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1574 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1575 mp->m_len += m->m_len; 1576 MFREE(m, mp->m_next); 1577 } else 1578 mp->m_next = m; 1579 m = mp; 1580 ilen += hlen - xlen; 1581 1582 } else if (proto == PPP_VJC_UNCOMP) { 1583 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1584 goto bad; 1585 1586 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1587 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1588 sc->sc_comp, &iphdr, &hlen); 1589 1590 if (xlen < 0) { 1591 if (sc->sc_flags & SC_DEBUG) 1592 printf("%s: VJ uncompress failed on type uncomp\n", 1593 ifp->if_xname); 1594 goto bad; 1595 } 1596 1597 proto = PPP_IP; 1598 cp[3] = PPP_IP; 1599 } 1600 #endif /* VJC */ 1601 1602 /* 1603 * If the packet will fit in a header mbuf, don't waste a 1604 * whole cluster on it. 1605 */ 1606 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1607 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1608 if (mp != NULL) { 1609 m_copydata(m, 0, ilen, mtod(mp, void *)); 1610 m_freem(m); 1611 m = mp; 1612 m->m_len = ilen; 1613 } 1614 } 1615 m->m_pkthdr.len = ilen; 1616 m->m_pkthdr.rcvif = ifp; 1617 1618 if ((proto & 0x8000) == 0) { 1619 #ifdef PPP_FILTER 1620 /* 1621 * See whether we want to pass this packet, and 1622 * if it counts as link activity. 1623 */ 1624 if (sc->sc_pass_filt_in.bf_insns != 0 1625 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1626 ilen, 0) == 0) { 1627 /* drop this packet */ 1628 m_freem(m); 1629 return; 1630 } 1631 if (sc->sc_active_filt_in.bf_insns == 0 1632 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1633 ilen, 0)) 1634 sc->sc_last_recv = time_second; 1635 #else 1636 /* 1637 * Record the time that we received this packet. 1638 */ 1639 sc->sc_last_recv = time_second; 1640 #endif /* PPP_FILTER */ 1641 } 1642 1643 #if NBPFILTER > 0 1644 /* See if bpf wants to look at the packet. */ 1645 if (sc->sc_if.if_bpf) 1646 bpf_mtap(sc->sc_if.if_bpf, m); 1647 #endif 1648 1649 rv = 0; 1650 switch (proto) { 1651 #ifdef INET 1652 case PPP_IP: 1653 /* 1654 * IP packet - take off the ppp header and pass it up to IP. 1655 */ 1656 if ((ifp->if_flags & IFF_UP) == 0 1657 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1658 /* interface is down - drop the packet. */ 1659 m_freem(m); 1660 return; 1661 } 1662 m->m_pkthdr.len -= PPP_HDRLEN; 1663 m->m_data += PPP_HDRLEN; 1664 m->m_len -= PPP_HDRLEN; 1665 #ifdef GATEWAY 1666 if (ipflow_fastforward(m)) 1667 return; 1668 #endif 1669 schednetisr(NETISR_IP); 1670 inq = &ipintrq; 1671 break; 1672 #endif 1673 1674 #ifdef INET6 1675 case PPP_IPV6: 1676 /* 1677 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1678 */ 1679 if ((ifp->if_flags & IFF_UP) == 0 1680 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1681 /* interface is down - drop the packet. */ 1682 m_freem(m); 1683 return; 1684 } 1685 m->m_pkthdr.len -= PPP_HDRLEN; 1686 m->m_data += PPP_HDRLEN; 1687 m->m_len -= PPP_HDRLEN; 1688 #ifdef GATEWAY 1689 if (ip6flow_fastforward(m)) 1690 return; 1691 #endif 1692 schednetisr(NETISR_IPV6); 1693 inq = &ip6intrq; 1694 break; 1695 #endif 1696 1697 default: 1698 /* 1699 * Some other protocol - place on input queue for read(). 1700 */ 1701 inq = &sc->sc_inq; 1702 rv = 1; 1703 break; 1704 } 1705 1706 /* 1707 * Put the packet on the appropriate input queue. 1708 */ 1709 s = splnet(); 1710 if (IF_QFULL(inq)) { 1711 IF_DROP(inq); 1712 splx(s); 1713 if (sc->sc_flags & SC_DEBUG) 1714 printf("%s: input queue full\n", ifp->if_xname); 1715 ifp->if_iqdrops++; 1716 goto bad; 1717 } 1718 IF_ENQUEUE(inq, m); 1719 splx(s); 1720 ifp->if_ipackets++; 1721 ifp->if_ibytes += ilen; 1722 1723 if (rv) 1724 (*sc->sc_ctlp)(sc); 1725 1726 return; 1727 1728 bad: 1729 m_freem(m); 1730 sc->sc_if.if_ierrors++; 1731 sc->sc_stats.ppp_ierrors++; 1732 } 1733 1734 #define MAX_DUMP_BYTES 128 1735 1736 static void 1737 pppdumpm(struct mbuf *m0) 1738 { 1739 char buf[3*MAX_DUMP_BYTES+4]; 1740 char *bp = buf; 1741 struct mbuf *m; 1742 1743 for (m = m0; m; m = m->m_next) { 1744 int l = m->m_len; 1745 u_char *rptr = (u_char *)m->m_data; 1746 1747 while (l--) { 1748 if (bp > buf + sizeof(buf) - 4) 1749 goto done; 1750 *bp++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */ 1751 *bp++ = hexdigits[*rptr++ & 0xf]; 1752 } 1753 1754 if (m->m_next) { 1755 if (bp > buf + sizeof(buf) - 3) 1756 goto done; 1757 *bp++ = '|'; 1758 } else 1759 *bp++ = ' '; 1760 } 1761 done: 1762 if (m) 1763 *bp++ = '>'; 1764 *bp = 0; 1765 printf("%s\n", buf); 1766 } 1767 1768 #ifdef ALTQ 1769 /* 1770 * a wrapper to transmit a packet from if_start since ALTQ uses 1771 * if_start to send a packet. 1772 */ 1773 static void 1774 ppp_ifstart(struct ifnet *ifp) 1775 { 1776 struct ppp_softc *sc; 1777 1778 sc = ifp->if_softc; 1779 (*sc->sc_start)(sc); 1780 } 1781 #endif 1782
Indexes created Thu Sep 25 16:09:42 GMT 2025