if_ppp.c revision 1.171
1 /* $NetBSD: if_ppp.c,v 1.171 2022/08/27 19:15:00 thorpej 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 1.171 2022/08/27 19:15:00 thorpej 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 IFQ_SET_MAXLEN(&sc->sc_inq, IFQ_MAXLEN); 323 IFQ_SET_MAXLEN(&sc->sc_fastq, IFQ_MAXLEN); 324 IFQ_SET_MAXLEN(&sc->sc_rawq, IFQ_MAXLEN); 325 326 IFQ_LOCK_INIT(&sc->sc_fastq); 327 328 /* Ratio of 1:2 packets between the regular and the fast queue */ 329 sc->sc_maxfastq = 2; 330 IFQ_SET_READY(&sc->sc_if.if_snd); 331 if_attach(&sc->sc_if); 332 if_alloc_sadl(&sc->sc_if); 333 bpf_attach(&sc->sc_if, DLT_NULL, 0); 334 return sc; 335 } 336 337 static int 338 ppp_clone_create(struct if_clone *ifc, int unit) 339 { 340 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 341 } 342 343 static int 344 ppp_clone_destroy(struct ifnet *ifp) 345 { 346 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 347 348 if (sc->sc_devp != NULL) 349 return EBUSY; /* Not removing it */ 350 351 mutex_enter(&ppp_softcs.lock); 352 LIST_REMOVE(sc, sc_iflist); 353 mutex_exit(&ppp_softcs.lock); 354 355 bpf_detach(ifp); 356 if_detach(ifp); 357 358 IFQ_LOCK_DESTROY(&sc->sc_fastq); 359 360 free(sc, M_DEVBUF); 361 return 0; 362 } 363 364 /* 365 * Allocate a ppp interface unit and initialize it. 366 */ 367 struct ppp_softc * 368 pppalloc(pid_t pid) 369 { 370 struct ppp_softc *sc = NULL, *scf; 371 int i; 372 373 mutex_enter(&ppp_softcs.lock); 374 LIST_FOREACH(scf, &ppp_softcs.list, sc_iflist) { 375 if (scf->sc_xfer == pid) { 376 scf->sc_xfer = 0; 377 mutex_exit(&ppp_softcs.lock); 378 return scf; 379 } 380 if (scf->sc_devp == NULL && sc == NULL) 381 sc = scf; 382 } 383 mutex_exit(&ppp_softcs.lock); 384 385 if (sc == NULL) 386 sc = ppp_create(ppp_cloner.ifc_name, -1); 387 388 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 389 if (sc->sc_si == NULL) { 390 printf("%s: unable to establish softintr\n", 391 sc->sc_if.if_xname); 392 return NULL; 393 } 394 sc->sc_flags = 0; 395 sc->sc_mru = PPP_MRU; 396 sc->sc_relinq = NULL; 397 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 398 #ifdef VJC 399 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 400 if (sc->sc_comp) 401 sl_compress_init(sc->sc_comp); 402 #endif 403 #ifdef PPP_COMPRESS 404 sc->sc_xc_state = NULL; 405 sc->sc_rc_state = NULL; 406 #endif /* PPP_COMPRESS */ 407 for (i = 0; i < NUM_NP; ++i) 408 sc->sc_npmode[i] = NPMODE_ERROR; 409 sc->sc_npqueue = NULL; 410 sc->sc_npqtail = &sc->sc_npqueue; 411 sc->sc_last_sent = sc->sc_last_recv = time_second; 412 413 return sc; 414 } 415 416 /* 417 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 418 */ 419 void 420 pppdealloc(struct ppp_softc *sc) 421 { 422 struct mbuf *m; 423 424 softint_disestablish(sc->sc_si); 425 if_down(&sc->sc_if); 426 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 427 sc->sc_devp = NULL; 428 sc->sc_xfer = 0; 429 for (;;) { 430 IF_DEQUEUE(&sc->sc_rawq, m); 431 if (m == NULL) 432 break; 433 m_freem(m); 434 } 435 for (;;) { 436 IF_DEQUEUE(&sc->sc_inq, m); 437 if (m == NULL) 438 break; 439 m_freem(m); 440 } 441 for (;;) { 442 IF_DEQUEUE(&sc->sc_fastq, m); 443 if (m == NULL) 444 break; 445 m_freem(m); 446 } 447 while ((m = sc->sc_npqueue) != NULL) { 448 sc->sc_npqueue = m->m_nextpkt; 449 m_freem(m); 450 } 451 if (sc->sc_togo != NULL) { 452 m_freem(sc->sc_togo); 453 sc->sc_togo = NULL; 454 } 455 #ifdef PPP_COMPRESS 456 ppp_ccp_closed(sc); 457 sc->sc_xc_state = NULL; 458 sc->sc_rc_state = NULL; 459 #endif /* PPP_COMPRESS */ 460 #ifdef PPP_FILTER 461 if (sc->sc_pass_filt_in.bf_insns != 0) { 462 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 463 sc->sc_pass_filt_in.bf_insns = 0; 464 sc->sc_pass_filt_in.bf_len = 0; 465 } 466 if (sc->sc_pass_filt_out.bf_insns != 0) { 467 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 468 sc->sc_pass_filt_out.bf_insns = 0; 469 sc->sc_pass_filt_out.bf_len = 0; 470 } 471 if (sc->sc_active_filt_in.bf_insns != 0) { 472 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 473 sc->sc_active_filt_in.bf_insns = 0; 474 sc->sc_active_filt_in.bf_len = 0; 475 } 476 if (sc->sc_active_filt_out.bf_insns != 0) { 477 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 478 sc->sc_active_filt_out.bf_insns = 0; 479 sc->sc_active_filt_out.bf_len = 0; 480 } 481 #endif /* PPP_FILTER */ 482 #ifdef VJC 483 if (sc->sc_comp != 0) { 484 free(sc->sc_comp, M_DEVBUF); 485 sc->sc_comp = 0; 486 } 487 #endif 488 (void)ppp_clone_destroy(&sc->sc_if); 489 } 490 491 /* 492 * Ioctl routine for generic ppp devices. 493 */ 494 int 495 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 496 struct lwp *l) 497 { 498 int s, error, flags, mru, npx; 499 u_int nb; 500 struct ppp_option_data *odp; 501 struct compressor *cp; 502 struct npioctl *npi; 503 time_t t; 504 #ifdef PPP_FILTER 505 struct bpf_program *bp, *nbp; 506 struct bpf_insn *newcode, *oldcode; 507 int newcodelen; 508 #endif /* PPP_FILTER */ 509 #ifdef PPP_COMPRESS 510 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 511 #endif 512 513 switch (cmd) { 514 case PPPIOCSFLAGS: 515 case PPPIOCSMRU: 516 case PPPIOCSMAXCID: 517 case PPPIOCSCOMPRESS: 518 case PPPIOCSNPMODE: 519 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 520 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 521 KAUTH_ARG(cmd), NULL) != 0) 522 return EPERM; 523 break; 524 case PPPIOCXFERUNIT: 525 /* XXX: Why is this privileged?! */ 526 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 527 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 528 KAUTH_ARG(cmd), NULL) != 0) 529 return EPERM; 530 break; 531 default: 532 break; 533 } 534 535 switch (cmd) { 536 case FIONREAD: 537 *(int *)data = sc->sc_inq.ifq_len; 538 break; 539 540 case PPPIOCGUNIT: 541 *(int *)data = sc->sc_unit; 542 break; 543 544 case PPPIOCGFLAGS: 545 *(u_int *)data = sc->sc_flags; 546 break; 547 548 case PPPIOCGRAWIN: 549 { 550 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 551 u_char c, q = 0; 552 553 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 554 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 555 556 for (c = 0; c < sc->sc_rawin_start;) 557 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 558 559 rwin->count = sc->sc_rawin.count; 560 } 561 break; 562 563 case PPPIOCSFLAGS: 564 flags = *(int *)data & SC_MASK; 565 s = splsoftnet(); 566 #ifdef PPP_COMPRESS 567 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 568 ppp_ccp_closed(sc); 569 #endif 570 splhigh(); /* XXX IMP ME HARDER */ 571 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 572 splx(s); 573 break; 574 575 case PPPIOCSMRU: 576 mru = *(int *)data; 577 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 578 sc->sc_mru = mru; 579 break; 580 581 case PPPIOCGMRU: 582 *(int *)data = sc->sc_mru; 583 break; 584 585 #ifdef VJC 586 case PPPIOCSMAXCID: 587 if (sc->sc_comp) { 588 s = splsoftnet(); 589 sl_compress_setup(sc->sc_comp, *(int *)data); 590 splx(s); 591 } 592 break; 593 #endif 594 595 case PPPIOCXFERUNIT: 596 sc->sc_xfer = l->l_proc->p_pid; 597 break; 598 599 #ifdef PPP_COMPRESS 600 case PPPIOCSCOMPRESS: 601 odp = (struct ppp_option_data *)data; 602 nb = odp->length; 603 if (nb > sizeof(ccp_option)) 604 nb = sizeof(ccp_option); 605 if (nb < 3) 606 return EINVAL; 607 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 608 return error; 609 /* preliminary check on the length byte */ 610 if (ccp_option[1] < 2) 611 return EINVAL; 612 cp = ppp_get_compressor(ccp_option[0]); 613 if (cp == NULL) { 614 if (sc->sc_flags & SC_DEBUG) 615 printf("%s: no compressor for [%x %x %x], %x\n", 616 sc->sc_if.if_xname, ccp_option[0], 617 ccp_option[1], ccp_option[2], nb); 618 return EINVAL; /* no handler found */ 619 } 620 /* 621 * Found a handler for the protocol - try to allocate 622 * a compressor or decompressor. 623 */ 624 error = 0; 625 if (odp->transmit) { 626 s = splsoftnet(); 627 if (sc->sc_xc_state != NULL) { 628 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 629 ppp_compressor_rele(sc->sc_xcomp); 630 } 631 sc->sc_xcomp = cp; 632 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 633 if (sc->sc_xc_state == NULL) { 634 if (sc->sc_flags & SC_DEBUG) 635 printf("%s: comp_alloc failed\n", 636 sc->sc_if.if_xname); 637 error = ENOBUFS; 638 } 639 splhigh(); /* XXX IMP ME HARDER */ 640 sc->sc_flags &= ~SC_COMP_RUN; 641 splx(s); 642 } else { 643 s = splsoftnet(); 644 if (sc->sc_rc_state != NULL) { 645 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 646 ppp_compressor_rele(sc->sc_rcomp); 647 } 648 sc->sc_rcomp = cp; 649 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 650 if (sc->sc_rc_state == NULL) { 651 if (sc->sc_flags & SC_DEBUG) 652 printf("%s: decomp_alloc failed\n", 653 sc->sc_if.if_xname); 654 error = ENOBUFS; 655 } 656 splhigh(); /* XXX IMP ME HARDER */ 657 sc->sc_flags &= ~SC_DECOMP_RUN; 658 splx(s); 659 } 660 return error; 661 #endif /* PPP_COMPRESS */ 662 663 case PPPIOCGNPMODE: 664 case PPPIOCSNPMODE: 665 npi = (struct npioctl *)data; 666 switch (npi->protocol) { 667 case PPP_IP: 668 npx = NP_IP; 669 break; 670 case PPP_IPV6: 671 npx = NP_IPV6; 672 break; 673 default: 674 return EINVAL; 675 } 676 if (cmd == PPPIOCGNPMODE) { 677 npi->mode = sc->sc_npmode[npx]; 678 } else { 679 if (npi->mode != sc->sc_npmode[npx]) { 680 s = splnet(); 681 sc->sc_npmode[npx] = npi->mode; 682 if (npi->mode != NPMODE_QUEUE) { 683 ppp_requeue(sc); 684 ppp_restart(sc); 685 } 686 splx(s); 687 } 688 } 689 break; 690 691 case PPPIOCGIDLE: 692 s = splsoftnet(); 693 t = time_second; 694 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 695 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 696 splx(s); 697 break; 698 699 #ifdef PPP_FILTER 700 case PPPIOCSPASS: 701 case PPPIOCSACTIVE: 702 /* These are no longer supported. */ 703 return EOPNOTSUPP; 704 705 case PPPIOCSIPASS: 706 case PPPIOCSOPASS: 707 case PPPIOCSIACTIVE: 708 case PPPIOCSOACTIVE: 709 nbp = (struct bpf_program *)data; 710 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 711 return EINVAL; 712 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 713 if (newcodelen != 0) { 714 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 715 /* WAITOK -- malloc() never fails. */ 716 if ((error = copyin((void *)nbp->bf_insns, 717 (void *)newcode, newcodelen)) != 0) { 718 free(newcode, M_DEVBUF); 719 return error; 720 } 721 if (!bpf_validate(newcode, nbp->bf_len)) { 722 free(newcode, M_DEVBUF); 723 return EINVAL; 724 } 725 } else 726 newcode = 0; 727 switch (cmd) { 728 case PPPIOCSIPASS: 729 bp = &sc->sc_pass_filt_in; 730 break; 731 732 case PPPIOCSOPASS: 733 bp = &sc->sc_pass_filt_out; 734 break; 735 736 case PPPIOCSIACTIVE: 737 bp = &sc->sc_active_filt_in; 738 break; 739 740 case PPPIOCSOACTIVE: 741 bp = &sc->sc_active_filt_out; 742 break; 743 default: 744 free(newcode, M_DEVBUF); 745 return EPASSTHROUGH; 746 } 747 oldcode = bp->bf_insns; 748 s = splnet(); 749 bp->bf_len = nbp->bf_len; 750 bp->bf_insns = newcode; 751 splx(s); 752 if (oldcode != 0) 753 free(oldcode, M_DEVBUF); 754 break; 755 #endif /* PPP_FILTER */ 756 757 default: 758 return EPASSTHROUGH; 759 } 760 return 0; 761 } 762 763 /* 764 * Process an ioctl request to the ppp network interface. 765 */ 766 static int 767 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 768 { 769 struct ppp_softc *sc = ifp->if_softc; 770 struct ifaddr *ifa = (struct ifaddr *)data; 771 struct ifreq *ifr = (struct ifreq *)data; 772 struct ppp_stats *psp; 773 #ifdef PPP_COMPRESS 774 struct ppp_comp_stats *pcp; 775 #endif 776 int s = splnet(), error = 0; 777 778 switch (cmd) { 779 case SIOCSIFFLAGS: 780 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 781 break; 782 if ((ifp->if_flags & IFF_RUNNING) == 0) 783 ifp->if_flags &= ~IFF_UP; 784 break; 785 786 case SIOCINITIFADDR: 787 switch (ifa->ifa_addr->sa_family) { 788 #ifdef INET 789 case AF_INET: 790 break; 791 #endif 792 #ifdef INET6 793 case AF_INET6: 794 break; 795 #endif 796 default: 797 printf("%s: af%d not supported\n", ifp->if_xname, 798 ifa->ifa_addr->sa_family); 799 error = EAFNOSUPPORT; 800 break; 801 } 802 ifa->ifa_rtrequest = p2p_rtrequest; 803 break; 804 805 case SIOCADDMULTI: 806 case SIOCDELMULTI: 807 if (ifr == NULL) { 808 error = EAFNOSUPPORT; 809 break; 810 } 811 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 812 #ifdef INET 813 case AF_INET: 814 break; 815 #endif 816 #ifdef INET6 817 case AF_INET6: 818 break; 819 #endif 820 default: 821 error = EAFNOSUPPORT; 822 break; 823 } 824 break; 825 826 case SIOCGPPPSTATS: 827 psp = &((struct ifpppstatsreq *)data)->stats; 828 memset(psp, 0, sizeof(*psp)); 829 psp->p = sc->sc_stats; 830 #if defined(VJC) && !defined(SL_NO_STATS) 831 if (sc->sc_comp) { 832 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 833 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 834 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 835 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 836 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 837 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 838 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 839 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 840 } 841 #endif /* VJC */ 842 break; 843 844 #ifdef PPP_COMPRESS 845 case SIOCGPPPCSTATS: 846 pcp = &((struct ifpppcstatsreq *)data)->stats; 847 memset(pcp, 0, sizeof(*pcp)); 848 if (sc->sc_xc_state != NULL) 849 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 850 if (sc->sc_rc_state != NULL) 851 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 852 break; 853 #endif /* PPP_COMPRESS */ 854 855 default: 856 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 857 error = 0; 858 break; 859 } 860 splx(s); 861 return error; 862 } 863 864 /* 865 * Queue a packet. Start transmission if not active. 866 * Packet is placed in Information field of PPP frame. 867 */ 868 int 869 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 870 const struct rtentry *rtp) 871 { 872 struct ppp_softc *sc = ifp->if_softc; 873 int protocol, address, control; 874 u_char *cp; 875 int s, error; 876 #ifdef INET 877 struct ip *ip; 878 #endif 879 struct ifqueue *ifq; 880 enum NPmode mode; 881 int len; 882 883 if (sc->sc_devp == NULL || 884 (ifp->if_flags & IFF_RUNNING) == 0 || 885 ((ifp->if_flags & IFF_UP) == 0 && 886 dst->sa_family != AF_UNSPEC)) { 887 error = ENETDOWN; /* sort of */ 888 goto bad; 889 } 890 891 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 892 893 /* 894 * Compute PPP header. 895 */ 896 m0->m_flags &= ~M_HIGHPRI; 897 switch (dst->sa_family) { 898 #ifdef INET 899 case AF_INET: 900 address = PPP_ALLSTATIONS; 901 control = PPP_UI; 902 protocol = PPP_IP; 903 mode = sc->sc_npmode[NP_IP]; 904 905 /* 906 * If this packet has the "low delay" bit set in the IP header, 907 * put it on the fastq instead. 908 */ 909 ip = mtod(m0, struct ip *); 910 if (ip->ip_tos & IPTOS_LOWDELAY) 911 m0->m_flags |= M_HIGHPRI; 912 break; 913 #endif 914 #ifdef INET6 915 case AF_INET6: 916 address = PPP_ALLSTATIONS; /*XXX*/ 917 control = PPP_UI; /*XXX*/ 918 protocol = PPP_IPV6; 919 mode = sc->sc_npmode[NP_IPV6]; 920 921 #if 0 /* XXX flowinfo/traffic class, maybe? */ 922 /* 923 * If this packet has the "low delay" bit set in the IP header, 924 * put it on the fastq instead. 925 */ 926 ip = mtod(m0, struct ip *); 927 if (ip->ip_tos & IPTOS_LOWDELAY) 928 m0->m_flags |= M_HIGHPRI; 929 #endif 930 break; 931 #endif 932 case AF_UNSPEC: 933 address = PPP_ADDRESS(dst->sa_data); 934 control = PPP_CONTROL(dst->sa_data); 935 protocol = PPP_PROTOCOL(dst->sa_data); 936 mode = NPMODE_PASS; 937 break; 938 default: 939 printf("%s: af%d not supported\n", ifp->if_xname, 940 dst->sa_family); 941 error = EAFNOSUPPORT; 942 goto bad; 943 } 944 945 /* 946 * Drop this packet, or return an error, if necessary. 947 */ 948 if (mode == NPMODE_ERROR) { 949 error = ENETDOWN; 950 goto bad; 951 } 952 if (mode == NPMODE_DROP) { 953 error = 0; 954 goto bad; 955 } 956 957 /* 958 * Add PPP header. 959 */ 960 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 961 if (m0 == NULL) { 962 error = ENOBUFS; 963 goto bad; 964 } 965 966 cp = mtod(m0, u_char *); 967 *cp++ = address; 968 *cp++ = control; 969 *cp++ = protocol >> 8; 970 *cp++ = protocol & 0xff; 971 972 len = m_length(m0); 973 974 if (sc->sc_flags & SC_LOG_OUTPKT) { 975 printf("%s output: ", ifp->if_xname); 976 pppdumpm(m0); 977 } 978 979 if ((protocol & 0x8000) == 0) { 980 #ifdef PPP_FILTER 981 /* 982 * Apply the pass and active filters to the packet, 983 * but only if it is a data packet. 984 */ 985 if (sc->sc_pass_filt_out.bf_insns != 0 && 986 bpf_filter(sc->sc_pass_filt_out.bf_insns, 987 (u_char *)m0, len, 0) == 0) { 988 error = 0; /* drop this packet */ 989 goto bad; 990 } 991 992 /* 993 * Update the time we sent the most recent packet. 994 */ 995 if (sc->sc_active_filt_out.bf_insns == 0 || 996 bpf_filter(sc->sc_active_filt_out.bf_insns, 997 (u_char *)m0, len, 0)) 998 sc->sc_last_sent = time_second; 999 #else 1000 /* 1001 * Update the time we sent the most recent packet. 1002 */ 1003 sc->sc_last_sent = time_second; 1004 #endif /* PPP_FILTER */ 1005 } 1006 1007 /* 1008 * See if bpf wants to look at the packet. 1009 */ 1010 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1011 1012 /* 1013 * Put the packet on the appropriate queue. 1014 */ 1015 s = splnet(); 1016 if (mode == NPMODE_QUEUE) { 1017 /* XXX we should limit the number of packets on this queue */ 1018 *sc->sc_npqtail = m0; 1019 m0->m_nextpkt = NULL; 1020 sc->sc_npqtail = &m0->m_nextpkt; 1021 } else { 1022 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1023 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1024 splx(s); 1025 if_statinc(&sc->sc_if, if_oerrors); 1026 sc->sc_stats.ppp_oerrors++; 1027 return error; 1028 } 1029 ppp_restart(sc); 1030 } 1031 if_statadd2(ifp, if_opackets, 1, if_obytes, len); 1032 1033 splx(s); 1034 return 0; 1035 1036 bad: 1037 m_freem(m0); 1038 return error; 1039 } 1040 1041 /* 1042 * After a change in the NPmode for some NP, move packets from the 1043 * npqueue to the send queue or the fast queue as appropriate. 1044 * Should be called at splnet, since we muck with the queues. 1045 */ 1046 static void 1047 ppp_requeue(struct ppp_softc *sc) 1048 { 1049 struct mbuf *m, **mpp; 1050 struct ifqueue *ifq; 1051 enum NPmode mode; 1052 int error; 1053 1054 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1055 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1056 case PPP_IP: 1057 mode = sc->sc_npmode[NP_IP]; 1058 break; 1059 case PPP_IPV6: 1060 mode = sc->sc_npmode[NP_IPV6]; 1061 break; 1062 default: 1063 mode = NPMODE_PASS; 1064 } 1065 1066 switch (mode) { 1067 case NPMODE_PASS: 1068 /* 1069 * This packet can now go on one of the queues to 1070 * be sent. 1071 */ 1072 *mpp = m->m_nextpkt; 1073 m->m_nextpkt = NULL; 1074 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1075 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1076 if_statinc(&sc->sc_if, if_oerrors); 1077 sc->sc_stats.ppp_oerrors++; 1078 } 1079 break; 1080 1081 case NPMODE_DROP: 1082 case NPMODE_ERROR: 1083 *mpp = m->m_nextpkt; 1084 m_freem(m); 1085 break; 1086 1087 case NPMODE_QUEUE: 1088 mpp = &m->m_nextpkt; 1089 break; 1090 } 1091 } 1092 sc->sc_npqtail = mpp; 1093 } 1094 1095 /* 1096 * Transmitter has finished outputting some stuff; 1097 * remember to call sc->sc_start later at splsoftnet. 1098 */ 1099 void 1100 ppp_restart(struct ppp_softc *sc) 1101 { 1102 int s = splhigh(); /* XXX IMP ME HARDER */ 1103 1104 sc->sc_flags &= ~SC_TBUSY; 1105 softint_schedule(sc->sc_si); 1106 splx(s); 1107 } 1108 1109 /* 1110 * Get a packet to send. This procedure is intended to be called at 1111 * splsoftnet, since it may involve time-consuming operations such as 1112 * applying VJ compression, packet compression, address/control and/or 1113 * protocol field compression to the packet. 1114 */ 1115 struct mbuf * 1116 ppp_dequeue(struct ppp_softc *sc) 1117 { 1118 struct mbuf *m, *mp; 1119 u_char *cp; 1120 int address, control, protocol; 1121 int s; 1122 1123 /* 1124 * Grab a packet to send: first try the fast queue, then the 1125 * normal queue. 1126 */ 1127 s = splnet(); 1128 if (sc->sc_nfastq < sc->sc_maxfastq) { 1129 IF_DEQUEUE(&sc->sc_fastq, m); 1130 if (m != NULL) 1131 sc->sc_nfastq++; 1132 else 1133 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1134 } else { 1135 sc->sc_nfastq = 0; 1136 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1137 if (m == NULL) { 1138 IF_DEQUEUE(&sc->sc_fastq, m); 1139 if (m != NULL) 1140 sc->sc_nfastq++; 1141 } 1142 } 1143 splx(s); 1144 1145 if (m == NULL) 1146 return NULL; 1147 1148 ++sc->sc_stats.ppp_opackets; 1149 1150 /* 1151 * Extract the ppp header of the new packet. 1152 * The ppp header will be in one mbuf. 1153 */ 1154 cp = mtod(m, u_char *); 1155 address = PPP_ADDRESS(cp); 1156 control = PPP_CONTROL(cp); 1157 protocol = PPP_PROTOCOL(cp); 1158 1159 switch (protocol) { 1160 case PPP_IP: 1161 #ifdef VJC 1162 /* 1163 * If the packet is a TCP/IP packet, see if we can compress it. 1164 */ 1165 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1166 struct ip *ip; 1167 int type; 1168 1169 mp = m; 1170 ip = (struct ip *)(cp + PPP_HDRLEN); 1171 if (mp->m_len <= PPP_HDRLEN) { 1172 mp = mp->m_next; 1173 if (mp == NULL) 1174 break; 1175 ip = mtod(mp, struct ip *); 1176 } 1177 /* 1178 * This code assumes the IP/TCP header is in one 1179 * non-shared mbuf 1180 */ 1181 if (ip->ip_p == IPPROTO_TCP) { 1182 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1183 !(sc->sc_flags & SC_NO_TCP_CCID)); 1184 switch (type) { 1185 case TYPE_UNCOMPRESSED_TCP: 1186 protocol = PPP_VJC_UNCOMP; 1187 break; 1188 case TYPE_COMPRESSED_TCP: 1189 protocol = PPP_VJC_COMP; 1190 cp = mtod(m, u_char *); 1191 cp[0] = address; /* Header has moved */ 1192 cp[1] = control; 1193 cp[2] = 0; 1194 break; 1195 } 1196 /* Update protocol in PPP header */ 1197 cp[3] = protocol; 1198 } 1199 } 1200 #endif /* VJC */ 1201 break; 1202 1203 #ifdef PPP_COMPRESS 1204 case PPP_CCP: 1205 ppp_ccp(sc, m, 0); 1206 break; 1207 #endif /* PPP_COMPRESS */ 1208 } 1209 1210 #ifdef PPP_COMPRESS 1211 if (protocol != PPP_LCP && protocol != PPP_CCP && 1212 sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1213 struct mbuf *mcomp = NULL; 1214 int slen; 1215 1216 slen = 0; 1217 for (mp = m; mp != NULL; mp = mp->m_next) 1218 slen += mp->m_len; 1219 (*sc->sc_xcomp->compress) 1220 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1221 if (mcomp != NULL) { 1222 if (sc->sc_flags & SC_CCP_UP) { 1223 /* 1224 * Send the compressed packet instead of the 1225 * original. 1226 */ 1227 m_freem(m); 1228 m = mcomp; 1229 cp = mtod(m, u_char *); 1230 protocol = cp[3]; 1231 } else { 1232 /* 1233 * Can't transmit compressed packets until CCP 1234 * is up. 1235 */ 1236 m_freem(mcomp); 1237 } 1238 } 1239 } 1240 #endif /* PPP_COMPRESS */ 1241 1242 /* 1243 * Compress the address/control and protocol, if possible. 1244 */ 1245 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1246 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1247 protocol != PPP_LCP) { 1248 /* can compress address/control */ 1249 m->m_data += 2; 1250 m->m_len -= 2; 1251 } 1252 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1253 /* can compress protocol */ 1254 if (mtod(m, u_char *) == cp) { 1255 cp[2] = cp[1]; /* move address/control up */ 1256 cp[1] = cp[0]; 1257 } 1258 ++m->m_data; 1259 --m->m_len; 1260 } 1261 1262 return m; 1263 } 1264 1265 /* 1266 * Software interrupt routine, called at splsoftnet. 1267 */ 1268 static void 1269 pppintr(void *arg) 1270 { 1271 struct ppp_softc *sc = arg; 1272 struct mbuf *m; 1273 int s; 1274 1275 mutex_enter(softnet_lock); 1276 if (!(sc->sc_flags & SC_TBUSY) && 1277 (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || 1278 sc->sc_fastq.ifq_head || 1279 sc->sc_outm)) { 1280 s = splhigh(); /* XXX IMP ME HARDER */ 1281 sc->sc_flags |= SC_TBUSY; 1282 splx(s); 1283 (*sc->sc_start)(sc); 1284 } 1285 for (;;) { 1286 s = splnet(); 1287 IF_DEQUEUE(&sc->sc_rawq, m); 1288 splx(s); 1289 if (m == NULL) 1290 break; 1291 ppp_inproc(sc, m); 1292 } 1293 mutex_exit(softnet_lock); 1294 } 1295 1296 #ifdef PPP_COMPRESS 1297 /* 1298 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1299 * 0 if it is about to be transmitted. 1300 */ 1301 static void 1302 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1303 { 1304 u_char *dp, *ep; 1305 struct mbuf *mp; 1306 int slen, s; 1307 1308 /* 1309 * Get a pointer to the data after the PPP header. 1310 */ 1311 if (m->m_len <= PPP_HDRLEN) { 1312 mp = m->m_next; 1313 if (mp == NULL) 1314 return; 1315 dp = mtod(mp, u_char *); 1316 } else { 1317 mp = m; 1318 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1319 } 1320 1321 ep = mtod(mp, u_char *) + mp->m_len; 1322 if (dp + CCP_HDRLEN > ep) 1323 return; 1324 slen = CCP_LENGTH(dp); 1325 if (dp + slen > ep) { 1326 if (sc->sc_flags & SC_DEBUG) 1327 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1328 dp, slen, mtod(mp, u_char *), mp->m_len); 1329 return; 1330 } 1331 1332 switch (CCP_CODE(dp)) { 1333 case CCP_CONFREQ: 1334 case CCP_TERMREQ: 1335 case CCP_TERMACK: 1336 /* CCP must be going down - disable compression */ 1337 if (sc->sc_flags & SC_CCP_UP) { 1338 s = splhigh(); /* XXX IMP ME HARDER */ 1339 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1340 splx(s); 1341 } 1342 break; 1343 1344 case CCP_CONFACK: 1345 if (sc->sc_flags & SC_CCP_OPEN && 1346 !(sc->sc_flags & SC_CCP_UP) && 1347 slen >= CCP_HDRLEN + CCP_OPT_MINLEN && 1348 slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1349 if (!rcvd) { 1350 /* We're agreeing to send compressed packets. */ 1351 if (sc->sc_xc_state != NULL && 1352 (*sc->sc_xcomp->comp_init)(sc->sc_xc_state, 1353 dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1354 sc->sc_unit, 0, 1355 sc->sc_flags & SC_DEBUG)) { 1356 s = splhigh(); /* XXX IMP ME HARDER */ 1357 sc->sc_flags |= SC_COMP_RUN; 1358 splx(s); 1359 } 1360 } else { 1361 /* 1362 * Peer is agreeing to send compressed 1363 * packets. 1364 */ 1365 if (sc->sc_rc_state != NULL && 1366 (*sc->sc_rcomp->decomp_init)( 1367 sc->sc_rc_state, 1368 dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1369 sc->sc_unit, 0, sc->sc_mru, 1370 sc->sc_flags & SC_DEBUG)) { 1371 s = splhigh(); /* XXX IMP ME HARDER */ 1372 sc->sc_flags |= SC_DECOMP_RUN; 1373 sc->sc_flags &= 1374 ~(SC_DC_ERROR | SC_DC_FERROR); 1375 splx(s); 1376 } 1377 } 1378 } 1379 break; 1380 1381 case CCP_RESETACK: 1382 if (sc->sc_flags & SC_CCP_UP) { 1383 if (!rcvd) { 1384 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1385 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1386 } else { 1387 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1388 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1389 s = splhigh(); /* XXX IMP ME HARDER */ 1390 sc->sc_flags &= ~SC_DC_ERROR; 1391 splx(s); 1392 } 1393 } 1394 } 1395 break; 1396 } 1397 } 1398 1399 /* 1400 * CCP is down; free (de)compressor state if necessary. 1401 */ 1402 static void 1403 ppp_ccp_closed(struct ppp_softc *sc) 1404 { 1405 if (sc->sc_xc_state) { 1406 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1407 ppp_compressor_rele(sc->sc_xcomp); 1408 sc->sc_xc_state = NULL; 1409 } 1410 if (sc->sc_rc_state) { 1411 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1412 ppp_compressor_rele(sc->sc_rcomp); 1413 sc->sc_rc_state = NULL; 1414 } 1415 } 1416 #endif /* PPP_COMPRESS */ 1417 1418 /* 1419 * PPP packet input routine. 1420 * The caller has checked and removed the FCS and has inserted 1421 * the address/control bytes and the protocol high byte if they 1422 * were omitted. 1423 */ 1424 void 1425 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1426 { 1427 int s = splhigh(); /* XXX IMP ME HARDER */ 1428 1429 if (lost) 1430 m->m_flags |= M_ERRMARK; 1431 IF_ENQUEUE(&sc->sc_rawq, m); 1432 softint_schedule(sc->sc_si); 1433 splx(s); 1434 } 1435 1436 /* 1437 * Process a received PPP packet, doing decompression as necessary. 1438 * Should be called at splsoftnet. 1439 */ 1440 #define COMPTYPE(proto) \ 1441 ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP \ 1442 : TYPE_UNCOMPRESSED_TCP) 1443 1444 static void 1445 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1446 { 1447 struct ifnet *ifp = &sc->sc_if; 1448 pktqueue_t *pktq = NULL; 1449 struct ifqueue *inq = NULL; 1450 int s, ilen, proto, rv; 1451 u_char *cp, adrs, ctrl; 1452 struct mbuf *mp, *dmp = NULL; 1453 #ifdef VJC 1454 int xlen; 1455 u_char *iphdr; 1456 u_int hlen; 1457 #endif 1458 1459 sc->sc_stats.ppp_ipackets++; 1460 1461 if (sc->sc_flags & SC_LOG_INPKT) { 1462 ilen = 0; 1463 for (mp = m; mp != NULL; mp = mp->m_next) 1464 ilen += mp->m_len; 1465 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1466 pppdumpm(m); 1467 } 1468 1469 cp = mtod(m, u_char *); 1470 adrs = PPP_ADDRESS(cp); 1471 ctrl = PPP_CONTROL(cp); 1472 proto = PPP_PROTOCOL(cp); 1473 1474 if (m->m_flags & M_ERRMARK) { 1475 m->m_flags &= ~M_ERRMARK; 1476 s = splhigh(); /* XXX IMP ME HARDER */ 1477 sc->sc_flags |= SC_VJ_RESET; 1478 splx(s); 1479 } 1480 1481 #ifdef PPP_COMPRESS 1482 /* 1483 * Decompress this packet if necessary, update the receiver's 1484 * dictionary, or take appropriate action on a CCP packet. 1485 */ 1486 if (proto == PPP_COMP && 1487 sc->sc_rc_state && 1488 (sc->sc_flags & SC_DECOMP_RUN) && 1489 !(sc->sc_flags & SC_DC_ERROR) && 1490 !(sc->sc_flags & SC_DC_FERROR)) { 1491 /* Decompress this packet */ 1492 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1493 if (rv == DECOMP_OK) { 1494 m_freem(m); 1495 if (dmp == NULL) { 1496 /* 1497 * No error, but no decompressed packet 1498 * produced 1499 */ 1500 return; 1501 } 1502 m = dmp; 1503 cp = mtod(m, u_char *); 1504 proto = PPP_PROTOCOL(cp); 1505 1506 } else { 1507 /* 1508 * An error has occurred in decompression. 1509 * Pass the compressed packet up to pppd, which may 1510 * take CCP down or issue a Reset-Req. 1511 */ 1512 if (sc->sc_flags & SC_DEBUG) 1513 printf("%s: decompress failed %d\n", 1514 ifp->if_xname, rv); 1515 s = splhigh(); /* XXX IMP ME HARDER */ 1516 sc->sc_flags |= SC_VJ_RESET; 1517 if (rv == DECOMP_ERROR) 1518 sc->sc_flags |= SC_DC_ERROR; 1519 else 1520 sc->sc_flags |= SC_DC_FERROR; 1521 splx(s); 1522 } 1523 1524 } else { 1525 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1526 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1527 if (proto == PPP_CCP) 1528 ppp_ccp(sc, m, 1); 1529 } 1530 #endif 1531 1532 ilen = 0; 1533 for (mp = m; mp != NULL; mp = mp->m_next) 1534 ilen += mp->m_len; 1535 1536 #ifdef VJC 1537 if (sc->sc_flags & SC_VJ_RESET) { 1538 /* 1539 * If we've missed a packet, we must toss subsequent compressed 1540 * packets which don't have an explicit connection ID. 1541 */ 1542 if (sc->sc_comp) 1543 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1544 s = splhigh(); /* XXX IMP ME HARDER */ 1545 sc->sc_flags &= ~SC_VJ_RESET; 1546 splx(s); 1547 } 1548 1549 /* 1550 * See if we have a VJ-compressed packet to uncompress. 1551 */ 1552 if (proto == PPP_VJC_COMP) { 1553 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1554 goto bad; 1555 1556 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1557 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1558 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1559 if (xlen <= 0) { 1560 if (sc->sc_flags & SC_DEBUG) { 1561 printf("%s: VJ uncompress failed" 1562 " on type comp\n", 1563 ifp->if_xname); 1564 } 1565 goto bad; 1566 } 1567 1568 /* Copy the PPP and IP headers into a new mbuf. */ 1569 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1570 if (mp == NULL) 1571 goto bad; 1572 mp->m_len = 0; 1573 mp->m_next = NULL; 1574 if (hlen + PPP_HDRLEN > MHLEN) { 1575 MCLGET(mp, M_DONTWAIT); 1576 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1577 /* Lose if big headers and no clusters */ 1578 m_freem(mp); 1579 goto bad; 1580 } 1581 } 1582 cp = mtod(mp, u_char *); 1583 cp[0] = adrs; 1584 cp[1] = ctrl; 1585 cp[2] = 0; 1586 cp[3] = PPP_IP; 1587 proto = PPP_IP; 1588 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1589 mp->m_len = hlen + PPP_HDRLEN; 1590 1591 /* 1592 * Trim the PPP and VJ headers off the old mbuf 1593 * and stick the new and old mbufs together. 1594 */ 1595 m->m_data += PPP_HDRLEN + xlen; 1596 m->m_len -= PPP_HDRLEN + xlen; 1597 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1598 bcopy(mtod(m, u_char *), 1599 mtod(mp, u_char *) + mp->m_len, m->m_len); 1600 mp->m_len += m->m_len; 1601 mp->m_next = m_free(m); 1602 } else 1603 mp->m_next = m; 1604 m = mp; 1605 ilen += hlen - xlen; 1606 1607 } else if (proto == PPP_VJC_UNCOMP) { 1608 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1609 goto bad; 1610 1611 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1612 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1613 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1614 if (xlen < 0) { 1615 if (sc->sc_flags & SC_DEBUG) { 1616 printf("%s: VJ uncompress failed" 1617 " on type uncomp\n", 1618 ifp->if_xname); 1619 } 1620 goto bad; 1621 } 1622 1623 proto = PPP_IP; 1624 cp[3] = PPP_IP; 1625 } 1626 #endif /* VJC */ 1627 1628 /* 1629 * If the packet will fit in a header mbuf, don't waste a 1630 * whole cluster on it. 1631 */ 1632 if (ilen <= MHLEN && (m->m_flags & M_EXT)) { 1633 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1634 if (mp != NULL) { 1635 m_copydata(m, 0, ilen, mtod(mp, void *)); 1636 m_freem(m); 1637 m = mp; 1638 m->m_len = ilen; 1639 } 1640 } 1641 m->m_pkthdr.len = ilen; 1642 m_set_rcvif(m, ifp); 1643 1644 if ((proto & 0x8000) == 0) { 1645 #ifdef PPP_FILTER 1646 /* 1647 * See whether we want to pass this packet, and 1648 * if it counts as link activity. 1649 */ 1650 if (sc->sc_pass_filt_in.bf_insns != 0 && 1651 bpf_filter(sc->sc_pass_filt_in.bf_insns, 1652 (u_char *)m, ilen, 0) == 0) { 1653 /* drop this packet */ 1654 m_freem(m); 1655 return; 1656 } 1657 if (sc->sc_active_filt_in.bf_insns == 0 || 1658 bpf_filter(sc->sc_active_filt_in.bf_insns, 1659 (u_char *)m, ilen, 0)) 1660 sc->sc_last_recv = time_second; 1661 #else 1662 /* 1663 * Record the time that we received this packet. 1664 */ 1665 sc->sc_last_recv = time_second; 1666 #endif /* PPP_FILTER */ 1667 } 1668 1669 /* See if bpf wants to look at the packet. */ 1670 bpf_mtap(&sc->sc_if, m, BPF_D_IN); 1671 1672 switch (proto) { 1673 #ifdef INET 1674 case PPP_IP: 1675 /* 1676 * IP packet - take off the ppp header and pass it up to IP. 1677 */ 1678 if ((ifp->if_flags & IFF_UP) == 0 || 1679 sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1680 /* Interface is down - drop the packet. */ 1681 m_freem(m); 1682 return; 1683 } 1684 m->m_pkthdr.len -= PPP_HDRLEN; 1685 m->m_data += PPP_HDRLEN; 1686 m->m_len -= PPP_HDRLEN; 1687 #ifdef GATEWAY 1688 if (ipflow_fastforward(m)) 1689 return; 1690 #endif 1691 pktq = ip_pktq; 1692 break; 1693 #endif 1694 1695 #ifdef INET6 1696 case PPP_IPV6: 1697 /* 1698 * IPv6 packet - take off the ppp header and pass it up to 1699 * IPv6. 1700 */ 1701 if ((ifp->if_flags & IFF_UP) == 0 || 1702 sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1703 /* interface is down - drop the packet. */ 1704 m_freem(m); 1705 return; 1706 } 1707 m->m_pkthdr.len -= PPP_HDRLEN; 1708 m->m_data += PPP_HDRLEN; 1709 m->m_len -= PPP_HDRLEN; 1710 #ifdef GATEWAY 1711 if (ip6flow_fastforward(&m)) 1712 return; 1713 #endif 1714 pktq = ip6_pktq; 1715 break; 1716 #endif 1717 1718 default: 1719 /* 1720 * Some other protocol - place on input queue for read(). 1721 */ 1722 inq = &sc->sc_inq; 1723 pktq = NULL; 1724 break; 1725 } 1726 1727 /* 1728 * Put the packet on the appropriate input queue. 1729 */ 1730 s = splnet(); 1731 1732 /* pktq: inet or inet6 cases */ 1733 if (__predict_true(pktq)) { 1734 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1735 splx(s); 1736 if_statinc(ifp, if_iqdrops); 1737 goto bad; 1738 } 1739 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1740 splx(s); 1741 return; 1742 } 1743 1744 /* ifq: other protocol cases */ 1745 if (!inq) { 1746 splx(s); 1747 goto bad; 1748 } 1749 if (IF_QFULL(inq)) { 1750 IF_DROP(inq); 1751 splx(s); 1752 if (sc->sc_flags & SC_DEBUG) 1753 printf("%s: input queue full\n", ifp->if_xname); 1754 if_statinc(ifp, if_iqdrops); 1755 goto bad; 1756 } 1757 IF_ENQUEUE(inq, m); 1758 splx(s); 1759 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1760 1761 (*sc->sc_ctlp)(sc); 1762 1763 return; 1764 1765 bad: 1766 m_freem(m); 1767 if_statinc(&sc->sc_if, if_ierrors); 1768 sc->sc_stats.ppp_ierrors++; 1769 } 1770 1771 #define MAX_DUMP_BYTES 128 1772 1773 static void 1774 pppdumpm(struct mbuf *m0) 1775 { 1776 char buf[3*MAX_DUMP_BYTES+4]; 1777 char *bp = buf; 1778 struct mbuf *m; 1779 1780 for (m = m0; m; m = m->m_next) { 1781 int l = m->m_len; 1782 u_char *rptr = (u_char *)m->m_data; 1783 1784 while (l--) { 1785 if (bp > buf + sizeof(buf) - 4) 1786 goto done; 1787 /* Convert byte to ascii hex */ 1788 *bp++ = hexdigits[*rptr >> 4]; 1789 *bp++ = hexdigits[*rptr++ & 0xf]; 1790 } 1791 1792 if (m->m_next) { 1793 if (bp > buf + sizeof(buf) - 3) 1794 goto done; 1795 *bp++ = '|'; 1796 } else 1797 *bp++ = ' '; 1798 } 1799 done: 1800 if (m) 1801 *bp++ = '>'; 1802 *bp = 0; 1803 printf("%s\n", buf); 1804 } 1805 1806 #ifdef ALTQ 1807 /* 1808 * A wrapper to transmit a packet from if_start since ALTQ uses 1809 * if_start to send a packet. 1810 */ 1811 static void 1812 ppp_ifstart(struct ifnet *ifp) 1813 { 1814 struct ppp_softc *sc; 1815 1816 sc = ifp->if_softc; 1817 (*sc->sc_start)(sc); 1818 } 1819 #endif 1820 1821 static const struct ppp_known_compressor { 1822 uint8_t code; 1823 const char *module; 1824 } ppp_known_compressors[] = { 1825 { CI_DEFLATE, "ppp_deflate" }, 1826 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1827 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1828 { CI_MPPE, "ppp_mppe" }, 1829 { 0, NULL } 1830 }; 1831 1832 static int 1833 ppp_compressor_init(void) 1834 { 1835 1836 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1837 return 0; 1838 } 1839 1840 static int 1841 ppp_compressor_destroy(void) 1842 { 1843 1844 mutex_destroy(&ppp_compressors_mtx); 1845 return 0; 1846 } 1847 1848 static void 1849 ppp_compressor_rele(struct compressor *cp) 1850 { 1851 1852 mutex_enter(&ppp_compressors_mtx); 1853 --cp->comp_refcnt; 1854 mutex_exit(&ppp_compressors_mtx); 1855 } 1856 1857 static struct compressor * 1858 ppp_get_compressor_noload(uint8_t ci, bool hold) 1859 { 1860 struct compressor *cp; 1861 1862 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1863 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1864 if (cp->compress_proto == ci) { 1865 if (hold) 1866 ++cp->comp_refcnt; 1867 return cp; 1868 } 1869 } 1870 1871 return NULL; 1872 } 1873 1874 static struct compressor * 1875 ppp_get_compressor(uint8_t ci) 1876 { 1877 struct compressor *cp = NULL; 1878 const struct ppp_known_compressor *pkc; 1879 1880 mutex_enter(&ppp_compressors_mtx); 1881 cp = ppp_get_compressor_noload(ci, true); 1882 mutex_exit(&ppp_compressors_mtx); 1883 if (cp != NULL) 1884 return cp; 1885 1886 kernconfig_lock(); 1887 mutex_enter(&ppp_compressors_mtx); 1888 cp = ppp_get_compressor_noload(ci, true); 1889 mutex_exit(&ppp_compressors_mtx); 1890 if (cp == NULL) { 1891 /* Not found, so try to autoload a module */ 1892 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1893 if (pkc->code == ci) { 1894 if (module_autoload(pkc->module, 1895 MODULE_CLASS_MISC) != 0) 1896 break; 1897 mutex_enter(&ppp_compressors_mtx); 1898 cp = ppp_get_compressor_noload(ci, true); 1899 mutex_exit(&ppp_compressors_mtx); 1900 break; 1901 } 1902 } 1903 } 1904 kernconfig_unlock(); 1905 1906 return cp; 1907 } 1908 1909 int 1910 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1911 { 1912 int error = 0; 1913 size_t i; 1914 1915 mutex_enter(&ppp_compressors_mtx); 1916 for (i = 0; i < ncomp; i++) { 1917 if (ppp_get_compressor_noload(pc[i].compress_proto, 1918 false) != NULL) 1919 error = EEXIST; 1920 } 1921 if (!error) { 1922 for (i = 0; i < ncomp; i++) { 1923 pc[i].comp_refcnt = 0; 1924 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1925 } 1926 } 1927 mutex_exit(&ppp_compressors_mtx); 1928 1929 return error; 1930 } 1931 1932 int 1933 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1934 { 1935 int error = 0; 1936 size_t i; 1937 1938 mutex_enter(&ppp_compressors_mtx); 1939 for (i = 0; i < ncomp; i++) { 1940 if (ppp_get_compressor_noload(pc[i].compress_proto, 1941 false) != &pc[i]) 1942 error = ENOENT; 1943 else if (pc[i].comp_refcnt != 0) 1944 error = EBUSY; 1945 } 1946 if (!error) { 1947 for (i = 0; i < ncomp; i++) { 1948 LIST_REMOVE(&pc[i], comp_list); 1949 } 1950 } 1951 mutex_exit(&ppp_compressors_mtx); 1952 1953 return error; 1954 } 1955 1956 /* 1957 * Module infrastructure 1958 */ 1959 #include "if_module.h" 1960 1961 #ifdef PPP_FILTER 1962 #define PPP_DEP "bpf_filter," 1963 #else 1964 #define PPP_DEP 1965 #endif 1966 1967 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1968
Indexes created Sat Sep 27 14:09:57 GMT 2025