if_ppp.c revision 1.166
1 /* $NetBSD: if_ppp.c,v 1.166 2019/09/20 08:45:29 maxv 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 1.166 2019/09/20 08:45:29 maxv Exp $"); 106 107 #ifdef _KERNEL_OPT 108 #include "ppp.h" 109 #include "opt_inet.h" 110 #include "opt_gateway.h" 111 #include "opt_ppp.h" 112 #endif 113 114 #ifdef INET 115 #define VJC 116 #endif 117 #define PPP_COMPRESS 118 119 #include <sys/param.h> 120 #include <sys/proc.h> 121 #include <sys/mbuf.h> 122 #include <sys/socket.h> 123 #include <sys/ioctl.h> 124 #include <sys/kernel.h> 125 #include <sys/systm.h> 126 #include <sys/time.h> 127 #include <sys/malloc.h> 128 #include <sys/module.h> 129 #include <sys/mutex.h> 130 #include <sys/once.h> 131 #include <sys/conf.h> 132 #include <sys/kauth.h> 133 #include <sys/intr.h> 134 #include <sys/socketvar.h> 135 #include <sys/device.h> 136 #include <sys/module.h> 137 138 #include <net/if.h> 139 #include <net/if_types.h> 140 #include <net/netisr.h> 141 #include <net/route.h> 142 143 #include <netinet/in.h> 144 #include <netinet/in_systm.h> 145 #include <netinet/in_var.h> 146 #ifdef INET 147 #include <netinet/ip.h> 148 #endif 149 150 #include <net/bpf.h> 151 #include <net/slip.h> 152 153 #ifdef VJC 154 #include <net/slcompress.h> 155 #endif 156 157 #include <net/ppp_defs.h> 158 #include <net/if_ppp.h> 159 #include <net/if_pppvar.h> 160 #include <sys/cpu.h> 161 162 #ifdef PPP_COMPRESS 163 #define PACKETPTR struct mbuf * 164 #include <net/ppp-comp.h> 165 #endif 166 167 #include "ioconf.h" 168 169 static int pppsioctl(struct ifnet *, u_long, void *); 170 static void ppp_requeue(struct ppp_softc *); 171 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 172 static void ppp_ccp_closed(struct ppp_softc *); 173 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 174 static void pppdumpm(struct mbuf *m0); 175 #ifdef ALTQ 176 static void ppp_ifstart(struct ifnet *ifp); 177 #endif 178 179 static void pppintr(void *); 180 181 extern struct linesw ppp_disc; 182 183 /* 184 * We define two link layer specific mbuf flags, to mark high-priority 185 * packets for output, and received packets following lost/corrupted 186 * packets. 187 */ 188 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 189 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 190 191 static int ppp_clone_create(struct if_clone *, int); 192 static int ppp_clone_destroy(struct ifnet *); 193 194 static struct ppp_softc *ppp_create(const char *, int); 195 196 static struct { 197 LIST_HEAD(ppp_sclist, ppp_softc) list; 198 kmutex_t lock; 199 } ppp_softcs __cacheline_aligned; 200 201 struct if_clone ppp_cloner = 202 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 203 204 #ifdef PPP_COMPRESS 205 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 206 static kmutex_t ppp_compressors_mtx; 207 208 static int ppp_compressor_init(void); 209 static int ppp_compressor_destroy(void); 210 static struct compressor *ppp_get_compressor(uint8_t); 211 static void ppp_compressor_rele(struct compressor *); 212 #endif /* PPP_COMPRESS */ 213 214 215 /* 216 * Called from boot code to establish ppp interfaces. 217 */ 218 void 219 pppattach(int n __unused) 220 { 221 222 /* 223 * Nothing to do here, initialization is handled by the 224 * module initialization code in pppinit() below). 225 */ 226 } 227 228 static void 229 pppinit(void) 230 { 231 /* Init the compressor sub-sub-system */ 232 ppp_compressor_init(); 233 234 if (ttyldisc_attach(&ppp_disc) != 0) 235 panic("%s", __func__); 236 237 mutex_init(&ppp_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 238 LIST_INIT(&ppp_softcs.list); 239 if_clone_attach(&ppp_cloner); 240 } 241 242 static int 243 pppdetach(void) 244 { 245 int error = 0; 246 247 if (!LIST_EMPTY(&ppp_softcs.list)) 248 error = EBUSY; 249 250 if (error == 0) 251 error = ttyldisc_detach(&ppp_disc); 252 253 if (error == 0) { 254 mutex_destroy(&ppp_softcs.lock); 255 if_clone_detach(&ppp_cloner); 256 ppp_compressor_destroy(); 257 } 258 259 return error; 260 } 261 262 static struct ppp_softc * 263 ppp_create(const char *name, int unit) 264 { 265 struct ppp_softc *sc, *sci, *scl = NULL; 266 267 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 268 269 mutex_enter(&ppp_softcs.lock); 270 if (unit == -1) { 271 int i = 0; 272 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 273 scl = sci; 274 if (i < sci->sc_unit) { 275 unit = i; 276 break; 277 } else { 278 #ifdef DIAGNOSTIC 279 KASSERT(i == sci->sc_unit); 280 #endif 281 i++; 282 } 283 } 284 if (unit == -1) 285 unit = i; 286 } else { 287 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 288 scl = sci; 289 if (unit < sci->sc_unit) 290 break; 291 else if (unit == sci->sc_unit) { 292 free(sc, M_DEVBUF); 293 mutex_exit(&ppp_softcs.lock); 294 return NULL; 295 } 296 } 297 } 298 299 if (sci != NULL) 300 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 301 else if (scl != NULL) 302 LIST_INSERT_AFTER(scl, sc, sc_iflist); 303 else 304 LIST_INSERT_HEAD(&ppp_softcs.list, sc, sc_iflist); 305 306 mutex_exit(&ppp_softcs.lock); 307 308 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 309 callout_init(&sc->sc_timo_ch, 0); 310 sc->sc_if.if_softc = sc; 311 sc->sc_if.if_mtu = PPP_MTU; 312 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 313 sc->sc_if.if_type = IFT_PPP; 314 sc->sc_if.if_hdrlen = PPP_HDRLEN; 315 sc->sc_if.if_dlt = DLT_NULL; 316 sc->sc_if.if_ioctl = pppsioctl; 317 sc->sc_if.if_output = pppoutput; 318 #ifdef ALTQ 319 sc->sc_if.if_start = ppp_ifstart; 320 #endif 321 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 322 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 323 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 324 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 325 /* Ratio of 1:2 packets between the regular and the fast queue */ 326 sc->sc_maxfastq = 2; 327 IFQ_SET_READY(&sc->sc_if.if_snd); 328 if_attach(&sc->sc_if); 329 if_alloc_sadl(&sc->sc_if); 330 bpf_attach(&sc->sc_if, DLT_NULL, 0); 331 return sc; 332 } 333 334 static int 335 ppp_clone_create(struct if_clone *ifc, int unit) 336 { 337 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 338 } 339 340 static int 341 ppp_clone_destroy(struct ifnet *ifp) 342 { 343 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 344 345 if (sc->sc_devp != NULL) 346 return EBUSY; /* Not removing it */ 347 348 mutex_enter(&ppp_softcs.lock); 349 LIST_REMOVE(sc, sc_iflist); 350 mutex_exit(&ppp_softcs.lock); 351 352 bpf_detach(ifp); 353 if_detach(ifp); 354 355 free(sc, M_DEVBUF); 356 return 0; 357 } 358 359 /* 360 * Allocate a ppp interface unit and initialize it. 361 */ 362 struct ppp_softc * 363 pppalloc(pid_t pid) 364 { 365 struct ppp_softc *sc = NULL, *scf; 366 int i; 367 368 mutex_enter(&ppp_softcs.lock); 369 LIST_FOREACH(scf, &ppp_softcs.list, sc_iflist) { 370 if (scf->sc_xfer == pid) { 371 scf->sc_xfer = 0; 372 mutex_exit(&ppp_softcs.lock); 373 return scf; 374 } 375 if (scf->sc_devp == NULL && sc == NULL) 376 sc = scf; 377 } 378 mutex_exit(&ppp_softcs.lock); 379 380 if (sc == NULL) 381 sc = ppp_create(ppp_cloner.ifc_name, -1); 382 383 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 384 if (sc->sc_si == NULL) { 385 printf("%s: unable to establish softintr\n", 386 sc->sc_if.if_xname); 387 return (NULL); 388 } 389 sc->sc_flags = 0; 390 sc->sc_mru = PPP_MRU; 391 sc->sc_relinq = NULL; 392 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 393 #ifdef VJC 394 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 395 if (sc->sc_comp) 396 sl_compress_init(sc->sc_comp); 397 #endif 398 #ifdef PPP_COMPRESS 399 sc->sc_xc_state = NULL; 400 sc->sc_rc_state = NULL; 401 #endif /* PPP_COMPRESS */ 402 for (i = 0; i < NUM_NP; ++i) 403 sc->sc_npmode[i] = NPMODE_ERROR; 404 sc->sc_npqueue = NULL; 405 sc->sc_npqtail = &sc->sc_npqueue; 406 sc->sc_last_sent = sc->sc_last_recv = time_second; 407 408 return sc; 409 } 410 411 /* 412 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 413 */ 414 void 415 pppdealloc(struct ppp_softc *sc) 416 { 417 struct mbuf *m; 418 419 softint_disestablish(sc->sc_si); 420 if_down(&sc->sc_if); 421 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 422 sc->sc_devp = NULL; 423 sc->sc_xfer = 0; 424 for (;;) { 425 IF_DEQUEUE(&sc->sc_rawq, m); 426 if (m == NULL) 427 break; 428 m_freem(m); 429 } 430 for (;;) { 431 IF_DEQUEUE(&sc->sc_inq, m); 432 if (m == NULL) 433 break; 434 m_freem(m); 435 } 436 for (;;) { 437 IF_DEQUEUE(&sc->sc_fastq, m); 438 if (m == NULL) 439 break; 440 m_freem(m); 441 } 442 while ((m = sc->sc_npqueue) != NULL) { 443 sc->sc_npqueue = m->m_nextpkt; 444 m_freem(m); 445 } 446 if (sc->sc_togo != NULL) { 447 m_freem(sc->sc_togo); 448 sc->sc_togo = NULL; 449 } 450 #ifdef PPP_COMPRESS 451 ppp_ccp_closed(sc); 452 sc->sc_xc_state = NULL; 453 sc->sc_rc_state = NULL; 454 #endif /* PPP_COMPRESS */ 455 #ifdef PPP_FILTER 456 if (sc->sc_pass_filt_in.bf_insns != 0) { 457 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 458 sc->sc_pass_filt_in.bf_insns = 0; 459 sc->sc_pass_filt_in.bf_len = 0; 460 } 461 if (sc->sc_pass_filt_out.bf_insns != 0) { 462 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 463 sc->sc_pass_filt_out.bf_insns = 0; 464 sc->sc_pass_filt_out.bf_len = 0; 465 } 466 if (sc->sc_active_filt_in.bf_insns != 0) { 467 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 468 sc->sc_active_filt_in.bf_insns = 0; 469 sc->sc_active_filt_in.bf_len = 0; 470 } 471 if (sc->sc_active_filt_out.bf_insns != 0) { 472 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 473 sc->sc_active_filt_out.bf_insns = 0; 474 sc->sc_active_filt_out.bf_len = 0; 475 } 476 #endif /* PPP_FILTER */ 477 #ifdef VJC 478 if (sc->sc_comp != 0) { 479 free(sc->sc_comp, M_DEVBUF); 480 sc->sc_comp = 0; 481 } 482 #endif 483 (void)ppp_clone_destroy(&sc->sc_if); 484 } 485 486 /* 487 * Ioctl routine for generic ppp devices. 488 */ 489 int 490 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 491 struct lwp *l) 492 { 493 int s, error, flags, mru, npx; 494 u_int nb; 495 struct ppp_option_data *odp; 496 struct compressor *cp; 497 struct npioctl *npi; 498 time_t t; 499 #ifdef PPP_FILTER 500 struct bpf_program *bp, *nbp; 501 struct bpf_insn *newcode, *oldcode; 502 int newcodelen; 503 #endif /* PPP_FILTER */ 504 #ifdef PPP_COMPRESS 505 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 506 #endif 507 508 switch (cmd) { 509 case PPPIOCSFLAGS: 510 case PPPIOCSMRU: 511 case PPPIOCSMAXCID: 512 case PPPIOCSCOMPRESS: 513 case PPPIOCSNPMODE: 514 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 515 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 516 KAUTH_ARG(cmd), NULL) != 0) 517 return (EPERM); 518 break; 519 case PPPIOCXFERUNIT: 520 /* XXX: Why is this privileged?! */ 521 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 522 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 523 KAUTH_ARG(cmd), NULL) != 0) 524 return (EPERM); 525 break; 526 default: 527 break; 528 } 529 530 switch (cmd) { 531 case FIONREAD: 532 *(int *)data = sc->sc_inq.ifq_len; 533 break; 534 535 case PPPIOCGUNIT: 536 *(int *)data = sc->sc_unit; 537 break; 538 539 case PPPIOCGFLAGS: 540 *(u_int *)data = sc->sc_flags; 541 break; 542 543 case PPPIOCGRAWIN: 544 { 545 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 546 u_char c, q = 0; 547 548 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 549 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 550 551 for (c = 0; c < sc->sc_rawin_start;) 552 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 553 554 rwin->count = sc->sc_rawin.count; 555 } 556 break; 557 558 case PPPIOCSFLAGS: 559 flags = *(int *)data & SC_MASK; 560 s = splsoftnet(); 561 #ifdef PPP_COMPRESS 562 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 563 ppp_ccp_closed(sc); 564 #endif 565 splhigh(); /* XXX IMP ME HARDER */ 566 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 567 splx(s); 568 break; 569 570 case PPPIOCSMRU: 571 mru = *(int *)data; 572 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 573 sc->sc_mru = mru; 574 break; 575 576 case PPPIOCGMRU: 577 *(int *)data = sc->sc_mru; 578 break; 579 580 #ifdef VJC 581 case PPPIOCSMAXCID: 582 if (sc->sc_comp) { 583 s = splsoftnet(); 584 sl_compress_setup(sc->sc_comp, *(int *)data); 585 splx(s); 586 } 587 break; 588 #endif 589 590 case PPPIOCXFERUNIT: 591 sc->sc_xfer = l->l_proc->p_pid; 592 break; 593 594 #ifdef PPP_COMPRESS 595 case PPPIOCSCOMPRESS: 596 odp = (struct ppp_option_data *) data; 597 nb = odp->length; 598 if (nb > sizeof(ccp_option)) 599 nb = sizeof(ccp_option); 600 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 601 return (error); 602 /* preliminary check on the length byte */ 603 if (ccp_option[1] < 2) 604 return (EINVAL); 605 cp = ppp_get_compressor(ccp_option[0]); 606 if (cp == NULL) { 607 if (sc->sc_flags & SC_DEBUG) 608 printf("%s: no compressor for [%x %x %x], %x\n", 609 sc->sc_if.if_xname, ccp_option[0], 610 ccp_option[1], ccp_option[2], nb); 611 return (EINVAL); /* no handler found */ 612 } 613 /* 614 * Found a handler for the protocol - try to allocate 615 * a compressor or decompressor. 616 */ 617 error = 0; 618 if (odp->transmit) { 619 s = splsoftnet(); 620 if (sc->sc_xc_state != NULL) { 621 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 622 ppp_compressor_rele(sc->sc_xcomp); 623 } 624 sc->sc_xcomp = cp; 625 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 626 if (sc->sc_xc_state == NULL) { 627 if (sc->sc_flags & SC_DEBUG) 628 printf("%s: comp_alloc failed\n", 629 sc->sc_if.if_xname); 630 error = ENOBUFS; 631 } 632 splhigh(); /* XXX IMP ME HARDER */ 633 sc->sc_flags &= ~SC_COMP_RUN; 634 splx(s); 635 } else { 636 s = splsoftnet(); 637 if (sc->sc_rc_state != NULL) { 638 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 639 ppp_compressor_rele(sc->sc_rcomp); 640 } 641 sc->sc_rcomp = cp; 642 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 643 if (sc->sc_rc_state == NULL) { 644 if (sc->sc_flags & SC_DEBUG) 645 printf("%s: decomp_alloc failed\n", 646 sc->sc_if.if_xname); 647 error = ENOBUFS; 648 } 649 splhigh(); /* XXX IMP ME HARDER */ 650 sc->sc_flags &= ~SC_DECOMP_RUN; 651 splx(s); 652 } 653 return (error); 654 #endif /* PPP_COMPRESS */ 655 656 case PPPIOCGNPMODE: 657 case PPPIOCSNPMODE: 658 npi = (struct npioctl *) data; 659 switch (npi->protocol) { 660 case PPP_IP: 661 npx = NP_IP; 662 break; 663 case PPP_IPV6: 664 npx = NP_IPV6; 665 break; 666 default: 667 return EINVAL; 668 } 669 if (cmd == PPPIOCGNPMODE) { 670 npi->mode = sc->sc_npmode[npx]; 671 } else { 672 if (npi->mode != sc->sc_npmode[npx]) { 673 s = splnet(); 674 sc->sc_npmode[npx] = npi->mode; 675 if (npi->mode != NPMODE_QUEUE) { 676 ppp_requeue(sc); 677 ppp_restart(sc); 678 } 679 splx(s); 680 } 681 } 682 break; 683 684 case PPPIOCGIDLE: 685 s = splsoftnet(); 686 t = time_second; 687 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 688 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 689 splx(s); 690 break; 691 692 #ifdef PPP_FILTER 693 case PPPIOCSPASS: 694 case PPPIOCSACTIVE: 695 /* These are no longer supported. */ 696 return EOPNOTSUPP; 697 698 case PPPIOCSIPASS: 699 case PPPIOCSOPASS: 700 case PPPIOCSIACTIVE: 701 case PPPIOCSOACTIVE: 702 nbp = (struct bpf_program *) data; 703 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 704 return EINVAL; 705 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 706 if (newcodelen != 0) { 707 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 708 /* WAITOK -- malloc() never fails. */ 709 if ((error = copyin((void *)nbp->bf_insns, 710 (void *)newcode, newcodelen)) != 0) { 711 free(newcode, M_DEVBUF); 712 return error; 713 } 714 if (!bpf_validate(newcode, nbp->bf_len)) { 715 free(newcode, M_DEVBUF); 716 return EINVAL; 717 } 718 } else 719 newcode = 0; 720 switch (cmd) { 721 case PPPIOCSIPASS: 722 bp = &sc->sc_pass_filt_in; 723 break; 724 725 case PPPIOCSOPASS: 726 bp = &sc->sc_pass_filt_out; 727 break; 728 729 case PPPIOCSIACTIVE: 730 bp = &sc->sc_active_filt_in; 731 break; 732 733 case PPPIOCSOACTIVE: 734 bp = &sc->sc_active_filt_out; 735 break; 736 default: 737 free(newcode, M_DEVBUF); 738 return (EPASSTHROUGH); 739 } 740 oldcode = bp->bf_insns; 741 s = splnet(); 742 bp->bf_len = nbp->bf_len; 743 bp->bf_insns = newcode; 744 splx(s); 745 if (oldcode != 0) 746 free(oldcode, M_DEVBUF); 747 break; 748 #endif /* PPP_FILTER */ 749 750 default: 751 return (EPASSTHROUGH); 752 } 753 return (0); 754 } 755 756 /* 757 * Process an ioctl request to the ppp network interface. 758 */ 759 static int 760 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 761 { 762 struct ppp_softc *sc = ifp->if_softc; 763 struct ifaddr *ifa = (struct ifaddr *)data; 764 struct ifreq *ifr = (struct ifreq *)data; 765 struct ppp_stats *psp; 766 #ifdef PPP_COMPRESS 767 struct ppp_comp_stats *pcp; 768 #endif 769 int s = splnet(), error = 0; 770 771 switch (cmd) { 772 case SIOCSIFFLAGS: 773 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 774 break; 775 if ((ifp->if_flags & IFF_RUNNING) == 0) 776 ifp->if_flags &= ~IFF_UP; 777 break; 778 779 case SIOCINITIFADDR: 780 switch (ifa->ifa_addr->sa_family) { 781 #ifdef INET 782 case AF_INET: 783 break; 784 #endif 785 #ifdef INET6 786 case AF_INET6: 787 break; 788 #endif 789 default: 790 printf("%s: af%d not supported\n", ifp->if_xname, 791 ifa->ifa_addr->sa_family); 792 error = EAFNOSUPPORT; 793 break; 794 } 795 ifa->ifa_rtrequest = p2p_rtrequest; 796 break; 797 798 case SIOCADDMULTI: 799 case SIOCDELMULTI: 800 if (ifr == NULL) { 801 error = EAFNOSUPPORT; 802 break; 803 } 804 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 805 #ifdef INET 806 case AF_INET: 807 break; 808 #endif 809 #ifdef INET6 810 case AF_INET6: 811 break; 812 #endif 813 default: 814 error = EAFNOSUPPORT; 815 break; 816 } 817 break; 818 819 case SIOCGPPPSTATS: 820 psp = &((struct ifpppstatsreq *) data)->stats; 821 memset(psp, 0, sizeof(*psp)); 822 psp->p = sc->sc_stats; 823 #if defined(VJC) && !defined(SL_NO_STATS) 824 if (sc->sc_comp) { 825 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 826 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 827 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 828 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 829 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 830 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 831 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 832 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 833 } 834 #endif /* VJC */ 835 break; 836 837 #ifdef PPP_COMPRESS 838 case SIOCGPPPCSTATS: 839 pcp = &((struct ifpppcstatsreq *) data)->stats; 840 memset(pcp, 0, sizeof(*pcp)); 841 if (sc->sc_xc_state != NULL) 842 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 843 if (sc->sc_rc_state != NULL) 844 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 845 break; 846 #endif /* PPP_COMPRESS */ 847 848 default: 849 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 850 error = 0; 851 break; 852 } 853 splx(s); 854 return (error); 855 } 856 857 /* 858 * Queue a packet. Start transmission if not active. 859 * Packet is placed in Information field of PPP frame. 860 */ 861 int 862 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 863 const struct rtentry *rtp) 864 { 865 struct ppp_softc *sc = ifp->if_softc; 866 int protocol, address, control; 867 u_char *cp; 868 int s, error; 869 #ifdef INET 870 struct ip *ip; 871 #endif 872 struct ifqueue *ifq; 873 enum NPmode mode; 874 int len; 875 876 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 877 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 878 error = ENETDOWN; /* sort of */ 879 goto bad; 880 } 881 882 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 883 884 /* 885 * Compute PPP header. 886 */ 887 m0->m_flags &= ~M_HIGHPRI; 888 switch (dst->sa_family) { 889 #ifdef INET 890 case AF_INET: 891 address = PPP_ALLSTATIONS; 892 control = PPP_UI; 893 protocol = PPP_IP; 894 mode = sc->sc_npmode[NP_IP]; 895 896 /* 897 * If this packet has the "low delay" bit set in the IP header, 898 * put it on the fastq instead. 899 */ 900 ip = mtod(m0, struct ip *); 901 if (ip->ip_tos & IPTOS_LOWDELAY) 902 m0->m_flags |= M_HIGHPRI; 903 break; 904 #endif 905 #ifdef INET6 906 case AF_INET6: 907 address = PPP_ALLSTATIONS; /*XXX*/ 908 control = PPP_UI; /*XXX*/ 909 protocol = PPP_IPV6; 910 mode = sc->sc_npmode[NP_IPV6]; 911 912 #if 0 /* XXX flowinfo/traffic class, maybe? */ 913 /* 914 * If this packet has the "low delay" bit set in the IP header, 915 * put it on the fastq instead. 916 */ 917 ip = mtod(m0, struct ip *); 918 if (ip->ip_tos & IPTOS_LOWDELAY) 919 m0->m_flags |= M_HIGHPRI; 920 #endif 921 break; 922 #endif 923 case AF_UNSPEC: 924 address = PPP_ADDRESS(dst->sa_data); 925 control = PPP_CONTROL(dst->sa_data); 926 protocol = PPP_PROTOCOL(dst->sa_data); 927 mode = NPMODE_PASS; 928 break; 929 default: 930 printf("%s: af%d not supported\n", ifp->if_xname, 931 dst->sa_family); 932 error = EAFNOSUPPORT; 933 goto bad; 934 } 935 936 /* 937 * Drop this packet, or return an error, if necessary. 938 */ 939 if (mode == NPMODE_ERROR) { 940 error = ENETDOWN; 941 goto bad; 942 } 943 if (mode == NPMODE_DROP) { 944 error = 0; 945 goto bad; 946 } 947 948 /* 949 * Add PPP header. 950 */ 951 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 952 if (m0 == NULL) { 953 error = ENOBUFS; 954 goto bad; 955 } 956 957 cp = mtod(m0, u_char *); 958 *cp++ = address; 959 *cp++ = control; 960 *cp++ = protocol >> 8; 961 *cp++ = protocol & 0xff; 962 963 len = m_length(m0); 964 965 if (sc->sc_flags & SC_LOG_OUTPKT) { 966 printf("%s output: ", ifp->if_xname); 967 pppdumpm(m0); 968 } 969 970 if ((protocol & 0x8000) == 0) { 971 #ifdef PPP_FILTER 972 /* 973 * Apply the pass and active filters to the packet, 974 * but only if it is a data packet. 975 */ 976 if (sc->sc_pass_filt_out.bf_insns != 0 977 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 978 (u_char *)m0, len, 0) == 0) { 979 error = 0; /* drop this packet */ 980 goto bad; 981 } 982 983 /* 984 * Update the time we sent the most recent packet. 985 */ 986 if (sc->sc_active_filt_out.bf_insns == 0 987 || bpf_filter(sc->sc_active_filt_out.bf_insns, 988 (u_char *)m0, len, 0)) 989 sc->sc_last_sent = time_second; 990 #else 991 /* 992 * Update the time we sent the most recent packet. 993 */ 994 sc->sc_last_sent = time_second; 995 #endif /* PPP_FILTER */ 996 } 997 998 /* 999 * See if bpf wants to look at the packet. 1000 */ 1001 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1002 1003 /* 1004 * Put the packet on the appropriate queue. 1005 */ 1006 s = splnet(); 1007 if (mode == NPMODE_QUEUE) { 1008 /* XXX we should limit the number of packets on this queue */ 1009 *sc->sc_npqtail = m0; 1010 m0->m_nextpkt = NULL; 1011 sc->sc_npqtail = &m0->m_nextpkt; 1012 } else { 1013 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1014 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1015 splx(s); 1016 sc->sc_if.if_oerrors++; 1017 sc->sc_stats.ppp_oerrors++; 1018 return (error); 1019 } 1020 ppp_restart(sc); 1021 } 1022 ifp->if_opackets++; 1023 ifp->if_obytes += len; 1024 1025 splx(s); 1026 return (0); 1027 1028 bad: 1029 m_freem(m0); 1030 return (error); 1031 } 1032 1033 /* 1034 * After a change in the NPmode for some NP, move packets from the 1035 * npqueue to the send queue or the fast queue as appropriate. 1036 * Should be called at splnet, since we muck with the queues. 1037 */ 1038 static void 1039 ppp_requeue(struct ppp_softc *sc) 1040 { 1041 struct mbuf *m, **mpp; 1042 struct ifqueue *ifq; 1043 enum NPmode mode; 1044 int error; 1045 1046 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1047 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1048 case PPP_IP: 1049 mode = sc->sc_npmode[NP_IP]; 1050 break; 1051 case PPP_IPV6: 1052 mode = sc->sc_npmode[NP_IPV6]; 1053 break; 1054 default: 1055 mode = NPMODE_PASS; 1056 } 1057 1058 switch (mode) { 1059 case NPMODE_PASS: 1060 /* 1061 * This packet can now go on one of the queues to 1062 * be sent. 1063 */ 1064 *mpp = m->m_nextpkt; 1065 m->m_nextpkt = NULL; 1066 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1067 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1068 sc->sc_if.if_oerrors++; 1069 sc->sc_stats.ppp_oerrors++; 1070 } 1071 break; 1072 1073 case NPMODE_DROP: 1074 case NPMODE_ERROR: 1075 *mpp = m->m_nextpkt; 1076 m_freem(m); 1077 break; 1078 1079 case NPMODE_QUEUE: 1080 mpp = &m->m_nextpkt; 1081 break; 1082 } 1083 } 1084 sc->sc_npqtail = mpp; 1085 } 1086 1087 /* 1088 * Transmitter has finished outputting some stuff; 1089 * remember to call sc->sc_start later at splsoftnet. 1090 */ 1091 void 1092 ppp_restart(struct ppp_softc *sc) 1093 { 1094 int s = splhigh(); /* XXX IMP ME HARDER */ 1095 1096 sc->sc_flags &= ~SC_TBUSY; 1097 softint_schedule(sc->sc_si); 1098 splx(s); 1099 } 1100 1101 /* 1102 * Get a packet to send. This procedure is intended to be called at 1103 * splsoftnet, since it may involve time-consuming operations such as 1104 * applying VJ compression, packet compression, address/control and/or 1105 * protocol field compression to the packet. 1106 */ 1107 struct mbuf * 1108 ppp_dequeue(struct ppp_softc *sc) 1109 { 1110 struct mbuf *m, *mp; 1111 u_char *cp; 1112 int address, control, protocol; 1113 int s; 1114 1115 /* 1116 * Grab a packet to send: first try the fast queue, then the 1117 * normal queue. 1118 */ 1119 s = splnet(); 1120 if (sc->sc_nfastq < sc->sc_maxfastq) { 1121 IF_DEQUEUE(&sc->sc_fastq, m); 1122 if (m != NULL) 1123 sc->sc_nfastq++; 1124 else 1125 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1126 } else { 1127 sc->sc_nfastq = 0; 1128 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1129 if (m == NULL) { 1130 IF_DEQUEUE(&sc->sc_fastq, m); 1131 if (m != NULL) 1132 sc->sc_nfastq++; 1133 } 1134 } 1135 splx(s); 1136 1137 if (m == NULL) 1138 return NULL; 1139 1140 ++sc->sc_stats.ppp_opackets; 1141 1142 /* 1143 * Extract the ppp header of the new packet. 1144 * The ppp header will be in one mbuf. 1145 */ 1146 cp = mtod(m, u_char *); 1147 address = PPP_ADDRESS(cp); 1148 control = PPP_CONTROL(cp); 1149 protocol = PPP_PROTOCOL(cp); 1150 1151 switch (protocol) { 1152 case PPP_IP: 1153 #ifdef VJC 1154 /* 1155 * If the packet is a TCP/IP packet, see if we can compress it. 1156 */ 1157 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1158 struct ip *ip; 1159 int type; 1160 1161 mp = m; 1162 ip = (struct ip *) (cp + PPP_HDRLEN); 1163 if (mp->m_len <= PPP_HDRLEN) { 1164 mp = mp->m_next; 1165 if (mp == NULL) 1166 break; 1167 ip = mtod(mp, struct ip *); 1168 } 1169 /* 1170 * This code assumes the IP/TCP header is in one 1171 * non-shared mbuf 1172 */ 1173 if (ip->ip_p == IPPROTO_TCP) { 1174 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1175 !(sc->sc_flags & SC_NO_TCP_CCID)); 1176 switch (type) { 1177 case TYPE_UNCOMPRESSED_TCP: 1178 protocol = PPP_VJC_UNCOMP; 1179 break; 1180 case TYPE_COMPRESSED_TCP: 1181 protocol = PPP_VJC_COMP; 1182 cp = mtod(m, u_char *); 1183 cp[0] = address; /* Header has moved */ 1184 cp[1] = control; 1185 cp[2] = 0; 1186 break; 1187 } 1188 /* Update protocol in PPP header */ 1189 cp[3] = protocol; 1190 } 1191 } 1192 #endif /* VJC */ 1193 break; 1194 1195 #ifdef PPP_COMPRESS 1196 case PPP_CCP: 1197 ppp_ccp(sc, m, 0); 1198 break; 1199 #endif /* PPP_COMPRESS */ 1200 } 1201 1202 #ifdef PPP_COMPRESS 1203 if (protocol != PPP_LCP && protocol != PPP_CCP 1204 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1205 struct mbuf *mcomp = NULL; 1206 int slen; 1207 1208 slen = 0; 1209 for (mp = m; mp != NULL; mp = mp->m_next) 1210 slen += mp->m_len; 1211 (*sc->sc_xcomp->compress) 1212 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1213 if (mcomp != NULL) { 1214 if (sc->sc_flags & SC_CCP_UP) { 1215 /* 1216 * Send the compressed packet instead of the 1217 * original. 1218 */ 1219 m_freem(m); 1220 m = mcomp; 1221 cp = mtod(m, u_char *); 1222 protocol = cp[3]; 1223 } else { 1224 /* 1225 * Can't transmit compressed packets until CCP 1226 * is up. 1227 */ 1228 m_freem(mcomp); 1229 } 1230 } 1231 } 1232 #endif /* PPP_COMPRESS */ 1233 1234 /* 1235 * Compress the address/control and protocol, if possible. 1236 */ 1237 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1238 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1239 protocol != PPP_LCP) { 1240 /* can compress address/control */ 1241 m->m_data += 2; 1242 m->m_len -= 2; 1243 } 1244 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1245 /* can compress protocol */ 1246 if (mtod(m, u_char *) == cp) { 1247 cp[2] = cp[1]; /* move address/control up */ 1248 cp[1] = cp[0]; 1249 } 1250 ++m->m_data; 1251 --m->m_len; 1252 } 1253 1254 return m; 1255 } 1256 1257 /* 1258 * Software interrupt routine, called at splsoftnet. 1259 */ 1260 static void 1261 pppintr(void *arg) 1262 { 1263 struct ppp_softc *sc = arg; 1264 struct mbuf *m; 1265 int s; 1266 1267 mutex_enter(softnet_lock); 1268 if (!(sc->sc_flags & SC_TBUSY) 1269 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1270 || sc->sc_outm)) { 1271 s = splhigh(); /* XXX IMP ME HARDER */ 1272 sc->sc_flags |= SC_TBUSY; 1273 splx(s); 1274 (*sc->sc_start)(sc); 1275 } 1276 for (;;) { 1277 s = splnet(); 1278 IF_DEQUEUE(&sc->sc_rawq, m); 1279 splx(s); 1280 if (m == NULL) 1281 break; 1282 ppp_inproc(sc, m); 1283 } 1284 mutex_exit(softnet_lock); 1285 } 1286 1287 #ifdef PPP_COMPRESS 1288 /* 1289 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1290 * 0 if it is about to be transmitted. 1291 */ 1292 static void 1293 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1294 { 1295 u_char *dp, *ep; 1296 struct mbuf *mp; 1297 int slen, s; 1298 1299 /* 1300 * Get a pointer to the data after the PPP header. 1301 */ 1302 if (m->m_len <= PPP_HDRLEN) { 1303 mp = m->m_next; 1304 if (mp == NULL) 1305 return; 1306 dp = mtod(mp, u_char *); 1307 } else { 1308 mp = m; 1309 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1310 } 1311 1312 ep = mtod(mp, u_char *) + mp->m_len; 1313 if (dp + CCP_HDRLEN > ep) 1314 return; 1315 slen = CCP_LENGTH(dp); 1316 if (dp + slen > ep) { 1317 if (sc->sc_flags & SC_DEBUG) 1318 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1319 dp, slen, mtod(mp, u_char *), mp->m_len); 1320 return; 1321 } 1322 1323 switch (CCP_CODE(dp)) { 1324 case CCP_CONFREQ: 1325 case CCP_TERMREQ: 1326 case CCP_TERMACK: 1327 /* CCP must be going down - disable compression */ 1328 if (sc->sc_flags & SC_CCP_UP) { 1329 s = splhigh(); /* XXX IMP ME HARDER */ 1330 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1331 splx(s); 1332 } 1333 break; 1334 1335 case CCP_CONFACK: 1336 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1337 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1338 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1339 if (!rcvd) { 1340 /* We're agreeing to send compressed packets. */ 1341 if (sc->sc_xc_state != NULL 1342 && (*sc->sc_xcomp->comp_init) 1343 (sc->sc_xc_state, dp + CCP_HDRLEN, 1344 slen - CCP_HDRLEN, sc->sc_unit, 0, 1345 sc->sc_flags & SC_DEBUG)) { 1346 s = splhigh(); /* XXX IMP ME HARDER */ 1347 sc->sc_flags |= SC_COMP_RUN; 1348 splx(s); 1349 } 1350 } else { 1351 /* 1352 * Peer is agreeing to send compressed 1353 * packets. 1354 */ 1355 if (sc->sc_rc_state != NULL 1356 && (*sc->sc_rcomp->decomp_init) 1357 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1358 sc->sc_unit, 0, sc->sc_mru, 1359 sc->sc_flags & SC_DEBUG)) { 1360 s = splhigh(); /* XXX IMP ME HARDER */ 1361 sc->sc_flags |= SC_DECOMP_RUN; 1362 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1363 splx(s); 1364 } 1365 } 1366 } 1367 break; 1368 1369 case CCP_RESETACK: 1370 if (sc->sc_flags & SC_CCP_UP) { 1371 if (!rcvd) { 1372 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1373 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1374 } else { 1375 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1376 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1377 s = splhigh(); /* XXX IMP ME HARDER */ 1378 sc->sc_flags &= ~SC_DC_ERROR; 1379 splx(s); 1380 } 1381 } 1382 } 1383 break; 1384 } 1385 } 1386 1387 /* 1388 * CCP is down; free (de)compressor state if necessary. 1389 */ 1390 static void 1391 ppp_ccp_closed(struct ppp_softc *sc) 1392 { 1393 if (sc->sc_xc_state) { 1394 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1395 ppp_compressor_rele(sc->sc_xcomp); 1396 sc->sc_xc_state = NULL; 1397 } 1398 if (sc->sc_rc_state) { 1399 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1400 ppp_compressor_rele(sc->sc_rcomp); 1401 sc->sc_rc_state = NULL; 1402 } 1403 } 1404 #endif /* PPP_COMPRESS */ 1405 1406 /* 1407 * PPP packet input routine. 1408 * The caller has checked and removed the FCS and has inserted 1409 * the address/control bytes and the protocol high byte if they 1410 * were omitted. 1411 */ 1412 void 1413 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1414 { 1415 int s = splhigh(); /* XXX IMP ME HARDER */ 1416 1417 if (lost) 1418 m->m_flags |= M_ERRMARK; 1419 IF_ENQUEUE(&sc->sc_rawq, m); 1420 softint_schedule(sc->sc_si); 1421 splx(s); 1422 } 1423 1424 /* 1425 * Process a received PPP packet, doing decompression as necessary. 1426 * Should be called at splsoftnet. 1427 */ 1428 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1429 TYPE_UNCOMPRESSED_TCP) 1430 1431 static void 1432 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1433 { 1434 struct ifnet *ifp = &sc->sc_if; 1435 pktqueue_t *pktq = NULL; 1436 struct ifqueue *inq = NULL; 1437 int s, ilen, proto, rv; 1438 u_char *cp, adrs, ctrl; 1439 struct mbuf *mp, *dmp = NULL; 1440 #ifdef VJC 1441 int xlen; 1442 u_char *iphdr; 1443 u_int hlen; 1444 #endif 1445 1446 sc->sc_stats.ppp_ipackets++; 1447 1448 if (sc->sc_flags & SC_LOG_INPKT) { 1449 ilen = 0; 1450 for (mp = m; mp != NULL; mp = mp->m_next) 1451 ilen += mp->m_len; 1452 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1453 pppdumpm(m); 1454 } 1455 1456 cp = mtod(m, u_char *); 1457 adrs = PPP_ADDRESS(cp); 1458 ctrl = PPP_CONTROL(cp); 1459 proto = PPP_PROTOCOL(cp); 1460 1461 if (m->m_flags & M_ERRMARK) { 1462 m->m_flags &= ~M_ERRMARK; 1463 s = splhigh(); /* XXX IMP ME HARDER */ 1464 sc->sc_flags |= SC_VJ_RESET; 1465 splx(s); 1466 } 1467 1468 #ifdef PPP_COMPRESS 1469 /* 1470 * Decompress this packet if necessary, update the receiver's 1471 * dictionary, or take appropriate action on a CCP packet. 1472 */ 1473 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1474 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1475 /* Decompress this packet */ 1476 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1477 if (rv == DECOMP_OK) { 1478 m_freem(m); 1479 if (dmp == NULL) { 1480 /* 1481 * No error, but no decompressed packet 1482 * produced 1483 */ 1484 return; 1485 } 1486 m = dmp; 1487 cp = mtod(m, u_char *); 1488 proto = PPP_PROTOCOL(cp); 1489 1490 } else { 1491 /* 1492 * An error has occurred in decompression. 1493 * Pass the compressed packet up to pppd, which may 1494 * take CCP down or issue a Reset-Req. 1495 */ 1496 if (sc->sc_flags & SC_DEBUG) 1497 printf("%s: decompress failed %d\n", 1498 ifp->if_xname, rv); 1499 s = splhigh(); /* XXX IMP ME HARDER */ 1500 sc->sc_flags |= SC_VJ_RESET; 1501 if (rv == DECOMP_ERROR) 1502 sc->sc_flags |= SC_DC_ERROR; 1503 else 1504 sc->sc_flags |= SC_DC_FERROR; 1505 splx(s); 1506 } 1507 1508 } else { 1509 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1510 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1511 if (proto == PPP_CCP) 1512 ppp_ccp(sc, m, 1); 1513 } 1514 #endif 1515 1516 ilen = 0; 1517 for (mp = m; mp != NULL; mp = mp->m_next) 1518 ilen += mp->m_len; 1519 1520 #ifdef VJC 1521 if (sc->sc_flags & SC_VJ_RESET) { 1522 /* 1523 * If we've missed a packet, we must toss subsequent compressed 1524 * packets which don't have an explicit connection ID. 1525 */ 1526 if (sc->sc_comp) 1527 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1528 s = splhigh(); /* XXX IMP ME HARDER */ 1529 sc->sc_flags &= ~SC_VJ_RESET; 1530 splx(s); 1531 } 1532 1533 /* 1534 * See if we have a VJ-compressed packet to uncompress. 1535 */ 1536 if (proto == PPP_VJC_COMP) { 1537 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1538 goto bad; 1539 1540 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1541 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1542 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1543 1544 if (xlen <= 0) { 1545 if (sc->sc_flags & SC_DEBUG) 1546 printf("%s: VJ uncompress failed on type comp\n", 1547 ifp->if_xname); 1548 goto bad; 1549 } 1550 1551 /* Copy the PPP and IP headers into a new mbuf. */ 1552 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1553 if (mp == NULL) 1554 goto bad; 1555 mp->m_len = 0; 1556 mp->m_next = NULL; 1557 if (hlen + PPP_HDRLEN > MHLEN) { 1558 MCLGET(mp, M_DONTWAIT); 1559 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1560 /* Lose if big headers and no clusters */ 1561 m_freem(mp); 1562 goto bad; 1563 } 1564 } 1565 cp = mtod(mp, u_char *); 1566 cp[0] = adrs; 1567 cp[1] = ctrl; 1568 cp[2] = 0; 1569 cp[3] = PPP_IP; 1570 proto = PPP_IP; 1571 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1572 mp->m_len = hlen + PPP_HDRLEN; 1573 1574 /* 1575 * Trim the PPP and VJ headers off the old mbuf 1576 * and stick the new and old mbufs together. 1577 */ 1578 m->m_data += PPP_HDRLEN + xlen; 1579 m->m_len -= PPP_HDRLEN + xlen; 1580 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1581 bcopy(mtod(m, u_char *), 1582 mtod(mp, u_char *) + mp->m_len, m->m_len); 1583 mp->m_len += m->m_len; 1584 mp->m_next = m_free(m); 1585 } else 1586 mp->m_next = m; 1587 m = mp; 1588 ilen += hlen - xlen; 1589 1590 } else if (proto == PPP_VJC_UNCOMP) { 1591 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1592 goto bad; 1593 1594 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1595 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1596 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1597 1598 if (xlen < 0) { 1599 if (sc->sc_flags & SC_DEBUG) 1600 printf("%s: VJ uncompress failed on type uncomp\n", 1601 ifp->if_xname); 1602 goto bad; 1603 } 1604 1605 proto = PPP_IP; 1606 cp[3] = PPP_IP; 1607 } 1608 #endif /* VJC */ 1609 1610 /* 1611 * If the packet will fit in a header mbuf, don't waste a 1612 * whole cluster on it. 1613 */ 1614 if (ilen <= MHLEN && (m->m_flags & M_EXT)) { 1615 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1616 if (mp != NULL) { 1617 m_copydata(m, 0, ilen, mtod(mp, void *)); 1618 m_freem(m); 1619 m = mp; 1620 m->m_len = ilen; 1621 } 1622 } 1623 m->m_pkthdr.len = ilen; 1624 m_set_rcvif(m, ifp); 1625 1626 if ((proto & 0x8000) == 0) { 1627 #ifdef PPP_FILTER 1628 /* 1629 * See whether we want to pass this packet, and 1630 * if it counts as link activity. 1631 */ 1632 if (sc->sc_pass_filt_in.bf_insns != 0 1633 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1634 (u_char *)m, ilen, 0) == 0) { 1635 /* drop this packet */ 1636 m_freem(m); 1637 return; 1638 } 1639 if (sc->sc_active_filt_in.bf_insns == 0 1640 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1641 (u_char *)m, ilen, 0)) 1642 sc->sc_last_recv = time_second; 1643 #else 1644 /* 1645 * Record the time that we received this packet. 1646 */ 1647 sc->sc_last_recv = time_second; 1648 #endif /* PPP_FILTER */ 1649 } 1650 1651 /* See if bpf wants to look at the packet. */ 1652 bpf_mtap(&sc->sc_if, m, BPF_D_IN); 1653 1654 switch (proto) { 1655 #ifdef INET 1656 case PPP_IP: 1657 /* 1658 * IP packet - take off the ppp header and pass it up to IP. 1659 */ 1660 if ((ifp->if_flags & IFF_UP) == 0 1661 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1662 /* Interface is down - drop the packet. */ 1663 m_freem(m); 1664 return; 1665 } 1666 m->m_pkthdr.len -= PPP_HDRLEN; 1667 m->m_data += PPP_HDRLEN; 1668 m->m_len -= PPP_HDRLEN; 1669 #ifdef GATEWAY 1670 if (ipflow_fastforward(m)) 1671 return; 1672 #endif 1673 pktq = ip_pktq; 1674 break; 1675 #endif 1676 1677 #ifdef INET6 1678 case PPP_IPV6: 1679 /* 1680 * IPv6 packet - take off the ppp header and pass it up to 1681 * IPv6. 1682 */ 1683 if ((ifp->if_flags & IFF_UP) == 0 1684 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1685 /* interface is down - drop the packet. */ 1686 m_freem(m); 1687 return; 1688 } 1689 m->m_pkthdr.len -= PPP_HDRLEN; 1690 m->m_data += PPP_HDRLEN; 1691 m->m_len -= PPP_HDRLEN; 1692 #ifdef GATEWAY 1693 if (ip6flow_fastforward(&m)) 1694 return; 1695 #endif 1696 pktq = ip6_pktq; 1697 break; 1698 #endif 1699 1700 default: 1701 /* 1702 * Some other protocol - place on input queue for read(). 1703 */ 1704 inq = &sc->sc_inq; 1705 pktq = NULL; 1706 break; 1707 } 1708 1709 /* 1710 * Put the packet on the appropriate input queue. 1711 */ 1712 s = splnet(); 1713 1714 /* pktq: inet or inet6 cases */ 1715 if (__predict_true(pktq)) { 1716 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1717 splx(s); 1718 ifp->if_iqdrops++; 1719 goto bad; 1720 } 1721 ifp->if_ipackets++; 1722 ifp->if_ibytes += ilen; 1723 splx(s); 1724 return; 1725 } 1726 1727 /* ifq: other protocol cases */ 1728 if (!inq) { 1729 splx(s); 1730 goto bad; 1731 } 1732 if (IF_QFULL(inq)) { 1733 IF_DROP(inq); 1734 splx(s); 1735 if (sc->sc_flags & SC_DEBUG) 1736 printf("%s: input queue full\n", ifp->if_xname); 1737 ifp->if_iqdrops++; 1738 goto bad; 1739 } 1740 IF_ENQUEUE(inq, m); 1741 splx(s); 1742 ifp->if_ipackets++; 1743 ifp->if_ibytes += ilen; 1744 1745 (*sc->sc_ctlp)(sc); 1746 1747 return; 1748 1749 bad: 1750 m_freem(m); 1751 sc->sc_if.if_ierrors++; 1752 sc->sc_stats.ppp_ierrors++; 1753 } 1754 1755 #define MAX_DUMP_BYTES 128 1756 1757 static void 1758 pppdumpm(struct mbuf *m0) 1759 { 1760 char buf[3*MAX_DUMP_BYTES+4]; 1761 char *bp = buf; 1762 struct mbuf *m; 1763 1764 for (m = m0; m; m = m->m_next) { 1765 int l = m->m_len; 1766 u_char *rptr = (u_char *)m->m_data; 1767 1768 while (l--) { 1769 if (bp > buf + sizeof(buf) - 4) 1770 goto done; 1771 /* Convert byte to ascii hex */ 1772 *bp++ = hexdigits[*rptr >> 4]; 1773 *bp++ = hexdigits[*rptr++ & 0xf]; 1774 } 1775 1776 if (m->m_next) { 1777 if (bp > buf + sizeof(buf) - 3) 1778 goto done; 1779 *bp++ = '|'; 1780 } else 1781 *bp++ = ' '; 1782 } 1783 done: 1784 if (m) 1785 *bp++ = '>'; 1786 *bp = 0; 1787 printf("%s\n", buf); 1788 } 1789 1790 #ifdef ALTQ 1791 /* 1792 * A wrapper to transmit a packet from if_start since ALTQ uses 1793 * if_start to send a packet. 1794 */ 1795 static void 1796 ppp_ifstart(struct ifnet *ifp) 1797 { 1798 struct ppp_softc *sc; 1799 1800 sc = ifp->if_softc; 1801 (*sc->sc_start)(sc); 1802 } 1803 #endif 1804 1805 static const struct ppp_known_compressor { 1806 uint8_t code; 1807 const char *module; 1808 } ppp_known_compressors[] = { 1809 { CI_DEFLATE, "ppp_deflate" }, 1810 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1811 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1812 { CI_MPPE, "ppp_mppe" }, 1813 { 0, NULL } 1814 }; 1815 1816 static int 1817 ppp_compressor_init(void) 1818 { 1819 1820 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1821 return 0; 1822 } 1823 1824 static int 1825 ppp_compressor_destroy(void) 1826 { 1827 1828 mutex_destroy(&ppp_compressors_mtx); 1829 return 0; 1830 } 1831 1832 static void 1833 ppp_compressor_rele(struct compressor *cp) 1834 { 1835 1836 mutex_enter(&ppp_compressors_mtx); 1837 --cp->comp_refcnt; 1838 mutex_exit(&ppp_compressors_mtx); 1839 } 1840 1841 static struct compressor * 1842 ppp_get_compressor_noload(uint8_t ci, bool hold) 1843 { 1844 struct compressor *cp; 1845 1846 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1847 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1848 if (cp->compress_proto == ci) { 1849 if (hold) 1850 ++cp->comp_refcnt; 1851 return cp; 1852 } 1853 } 1854 1855 return NULL; 1856 } 1857 1858 static struct compressor * 1859 ppp_get_compressor(uint8_t ci) 1860 { 1861 struct compressor *cp = NULL; 1862 const struct ppp_known_compressor *pkc; 1863 1864 mutex_enter(&ppp_compressors_mtx); 1865 cp = ppp_get_compressor_noload(ci, true); 1866 mutex_exit(&ppp_compressors_mtx); 1867 if (cp != NULL) 1868 return cp; 1869 1870 kernconfig_lock(); 1871 mutex_enter(&ppp_compressors_mtx); 1872 cp = ppp_get_compressor_noload(ci, true); 1873 mutex_exit(&ppp_compressors_mtx); 1874 if (cp == NULL) { 1875 /* Not found, so try to autoload a module */ 1876 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1877 if (pkc->code == ci) { 1878 if (module_autoload(pkc->module, 1879 MODULE_CLASS_MISC) != 0) 1880 break; 1881 mutex_enter(&ppp_compressors_mtx); 1882 cp = ppp_get_compressor_noload(ci, true); 1883 mutex_exit(&ppp_compressors_mtx); 1884 break; 1885 } 1886 } 1887 } 1888 kernconfig_unlock(); 1889 1890 return cp; 1891 } 1892 1893 int 1894 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1895 { 1896 int error = 0; 1897 size_t i; 1898 1899 mutex_enter(&ppp_compressors_mtx); 1900 for (i = 0; i < ncomp; i++) { 1901 if (ppp_get_compressor_noload(pc[i].compress_proto, 1902 false) != NULL) 1903 error = EEXIST; 1904 } 1905 if (!error) { 1906 for (i = 0; i < ncomp; i++) { 1907 pc[i].comp_refcnt = 0; 1908 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1909 } 1910 } 1911 mutex_exit(&ppp_compressors_mtx); 1912 1913 return error; 1914 } 1915 1916 int 1917 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1918 { 1919 int error = 0; 1920 size_t i; 1921 1922 mutex_enter(&ppp_compressors_mtx); 1923 for (i = 0; i < ncomp; i++) { 1924 if (ppp_get_compressor_noload(pc[i].compress_proto, 1925 false) != &pc[i]) 1926 error = ENOENT; 1927 else if (pc[i].comp_refcnt != 0) 1928 error = EBUSY; 1929 } 1930 if (!error) { 1931 for (i = 0; i < ncomp; i++) { 1932 LIST_REMOVE(&pc[i], comp_list); 1933 } 1934 } 1935 mutex_exit(&ppp_compressors_mtx); 1936 1937 return error; 1938 } 1939 1940 /* 1941 * Module infrastructure 1942 */ 1943 #include "if_module.h" 1944 1945 #ifdef PPP_FILTER 1946 #define PPP_DEP "bpf_filter," 1947 #else 1948 #define PPP_DEP 1949 #endif 1950 1951 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1952
Indexes created Fri Oct 03 02:09:57 GMT 2025