if_ppp.c revision 1.168
1 /* $NetBSD: if_ppp.c,v 1.168 2022/07/06 08:06:59 riastradh 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 1.168 2022/07/06 08:06:59 riastradh 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 || 877 (ifp->if_flags & IFF_RUNNING) == 0 || 878 ((ifp->if_flags & IFF_UP) == 0 && 879 dst->sa_family != AF_UNSPEC)) { 880 error = ENETDOWN; /* sort of */ 881 goto bad; 882 } 883 884 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 885 886 /* 887 * Compute PPP header. 888 */ 889 m0->m_flags &= ~M_HIGHPRI; 890 switch (dst->sa_family) { 891 #ifdef INET 892 case AF_INET: 893 address = PPP_ALLSTATIONS; 894 control = PPP_UI; 895 protocol = PPP_IP; 896 mode = sc->sc_npmode[NP_IP]; 897 898 /* 899 * If this packet has the "low delay" bit set in the IP header, 900 * put it on the fastq instead. 901 */ 902 ip = mtod(m0, struct ip *); 903 if (ip->ip_tos & IPTOS_LOWDELAY) 904 m0->m_flags |= M_HIGHPRI; 905 break; 906 #endif 907 #ifdef INET6 908 case AF_INET6: 909 address = PPP_ALLSTATIONS; /*XXX*/ 910 control = PPP_UI; /*XXX*/ 911 protocol = PPP_IPV6; 912 mode = sc->sc_npmode[NP_IPV6]; 913 914 #if 0 /* XXX flowinfo/traffic class, maybe? */ 915 /* 916 * If this packet has the "low delay" bit set in the IP header, 917 * put it on the fastq instead. 918 */ 919 ip = mtod(m0, struct ip *); 920 if (ip->ip_tos & IPTOS_LOWDELAY) 921 m0->m_flags |= M_HIGHPRI; 922 #endif 923 break; 924 #endif 925 case AF_UNSPEC: 926 address = PPP_ADDRESS(dst->sa_data); 927 control = PPP_CONTROL(dst->sa_data); 928 protocol = PPP_PROTOCOL(dst->sa_data); 929 mode = NPMODE_PASS; 930 break; 931 default: 932 printf("%s: af%d not supported\n", ifp->if_xname, 933 dst->sa_family); 934 error = EAFNOSUPPORT; 935 goto bad; 936 } 937 938 /* 939 * Drop this packet, or return an error, if necessary. 940 */ 941 if (mode == NPMODE_ERROR) { 942 error = ENETDOWN; 943 goto bad; 944 } 945 if (mode == NPMODE_DROP) { 946 error = 0; 947 goto bad; 948 } 949 950 /* 951 * Add PPP header. 952 */ 953 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 954 if (m0 == NULL) { 955 error = ENOBUFS; 956 goto bad; 957 } 958 959 cp = mtod(m0, u_char *); 960 *cp++ = address; 961 *cp++ = control; 962 *cp++ = protocol >> 8; 963 *cp++ = protocol & 0xff; 964 965 len = m_length(m0); 966 967 if (sc->sc_flags & SC_LOG_OUTPKT) { 968 printf("%s output: ", ifp->if_xname); 969 pppdumpm(m0); 970 } 971 972 if ((protocol & 0x8000) == 0) { 973 #ifdef PPP_FILTER 974 /* 975 * Apply the pass and active filters to the packet, 976 * but only if it is a data packet. 977 */ 978 if (sc->sc_pass_filt_out.bf_insns != 0 && 979 bpf_filter(sc->sc_pass_filt_out.bf_insns, 980 (u_char *)m0, len, 0) == 0) { 981 error = 0; /* drop this packet */ 982 goto bad; 983 } 984 985 /* 986 * Update the time we sent the most recent packet. 987 */ 988 if (sc->sc_active_filt_out.bf_insns == 0 || 989 bpf_filter(sc->sc_active_filt_out.bf_insns, 990 (u_char *)m0, len, 0)) 991 sc->sc_last_sent = time_second; 992 #else 993 /* 994 * Update the time we sent the most recent packet. 995 */ 996 sc->sc_last_sent = time_second; 997 #endif /* PPP_FILTER */ 998 } 999 1000 /* 1001 * See if bpf wants to look at the packet. 1002 */ 1003 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1004 1005 /* 1006 * Put the packet on the appropriate queue. 1007 */ 1008 s = splnet(); 1009 if (mode == NPMODE_QUEUE) { 1010 /* XXX we should limit the number of packets on this queue */ 1011 *sc->sc_npqtail = m0; 1012 m0->m_nextpkt = NULL; 1013 sc->sc_npqtail = &m0->m_nextpkt; 1014 } else { 1015 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1016 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1017 splx(s); 1018 if_statinc(&sc->sc_if, if_oerrors); 1019 sc->sc_stats.ppp_oerrors++; 1020 return error; 1021 } 1022 ppp_restart(sc); 1023 } 1024 if_statadd2(ifp, if_opackets, 1, if_obytes, len); 1025 1026 splx(s); 1027 return 0; 1028 1029 bad: 1030 m_freem(m0); 1031 return error; 1032 } 1033 1034 /* 1035 * After a change in the NPmode for some NP, move packets from the 1036 * npqueue to the send queue or the fast queue as appropriate. 1037 * Should be called at splnet, since we muck with the queues. 1038 */ 1039 static void 1040 ppp_requeue(struct ppp_softc *sc) 1041 { 1042 struct mbuf *m, **mpp; 1043 struct ifqueue *ifq; 1044 enum NPmode mode; 1045 int error; 1046 1047 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1048 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1049 case PPP_IP: 1050 mode = sc->sc_npmode[NP_IP]; 1051 break; 1052 case PPP_IPV6: 1053 mode = sc->sc_npmode[NP_IPV6]; 1054 break; 1055 default: 1056 mode = NPMODE_PASS; 1057 } 1058 1059 switch (mode) { 1060 case NPMODE_PASS: 1061 /* 1062 * This packet can now go on one of the queues to 1063 * be sent. 1064 */ 1065 *mpp = m->m_nextpkt; 1066 m->m_nextpkt = NULL; 1067 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1068 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1069 if_statinc(&sc->sc_if, if_oerrors); 1070 sc->sc_stats.ppp_oerrors++; 1071 } 1072 break; 1073 1074 case NPMODE_DROP: 1075 case NPMODE_ERROR: 1076 *mpp = m->m_nextpkt; 1077 m_freem(m); 1078 break; 1079 1080 case NPMODE_QUEUE: 1081 mpp = &m->m_nextpkt; 1082 break; 1083 } 1084 } 1085 sc->sc_npqtail = mpp; 1086 } 1087 1088 /* 1089 * Transmitter has finished outputting some stuff; 1090 * remember to call sc->sc_start later at splsoftnet. 1091 */ 1092 void 1093 ppp_restart(struct ppp_softc *sc) 1094 { 1095 int s = splhigh(); /* XXX IMP ME HARDER */ 1096 1097 sc->sc_flags &= ~SC_TBUSY; 1098 softint_schedule(sc->sc_si); 1099 splx(s); 1100 } 1101 1102 /* 1103 * Get a packet to send. This procedure is intended to be called at 1104 * splsoftnet, since it may involve time-consuming operations such as 1105 * applying VJ compression, packet compression, address/control and/or 1106 * protocol field compression to the packet. 1107 */ 1108 struct mbuf * 1109 ppp_dequeue(struct ppp_softc *sc) 1110 { 1111 struct mbuf *m, *mp; 1112 u_char *cp; 1113 int address, control, protocol; 1114 int s; 1115 1116 /* 1117 * Grab a packet to send: first try the fast queue, then the 1118 * normal queue. 1119 */ 1120 s = splnet(); 1121 if (sc->sc_nfastq < sc->sc_maxfastq) { 1122 IF_DEQUEUE(&sc->sc_fastq, m); 1123 if (m != NULL) 1124 sc->sc_nfastq++; 1125 else 1126 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1127 } else { 1128 sc->sc_nfastq = 0; 1129 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1130 if (m == NULL) { 1131 IF_DEQUEUE(&sc->sc_fastq, m); 1132 if (m != NULL) 1133 sc->sc_nfastq++; 1134 } 1135 } 1136 splx(s); 1137 1138 if (m == NULL) 1139 return NULL; 1140 1141 ++sc->sc_stats.ppp_opackets; 1142 1143 /* 1144 * Extract the ppp header of the new packet. 1145 * The ppp header will be in one mbuf. 1146 */ 1147 cp = mtod(m, u_char *); 1148 address = PPP_ADDRESS(cp); 1149 control = PPP_CONTROL(cp); 1150 protocol = PPP_PROTOCOL(cp); 1151 1152 switch (protocol) { 1153 case PPP_IP: 1154 #ifdef VJC 1155 /* 1156 * If the packet is a TCP/IP packet, see if we can compress it. 1157 */ 1158 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1159 struct ip *ip; 1160 int type; 1161 1162 mp = m; 1163 ip = (struct ip *)(cp + PPP_HDRLEN); 1164 if (mp->m_len <= PPP_HDRLEN) { 1165 mp = mp->m_next; 1166 if (mp == NULL) 1167 break; 1168 ip = mtod(mp, struct ip *); 1169 } 1170 /* 1171 * This code assumes the IP/TCP header is in one 1172 * non-shared mbuf 1173 */ 1174 if (ip->ip_p == IPPROTO_TCP) { 1175 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1176 !(sc->sc_flags & SC_NO_TCP_CCID)); 1177 switch (type) { 1178 case TYPE_UNCOMPRESSED_TCP: 1179 protocol = PPP_VJC_UNCOMP; 1180 break; 1181 case TYPE_COMPRESSED_TCP: 1182 protocol = PPP_VJC_COMP; 1183 cp = mtod(m, u_char *); 1184 cp[0] = address; /* Header has moved */ 1185 cp[1] = control; 1186 cp[2] = 0; 1187 break; 1188 } 1189 /* Update protocol in PPP header */ 1190 cp[3] = protocol; 1191 } 1192 } 1193 #endif /* VJC */ 1194 break; 1195 1196 #ifdef PPP_COMPRESS 1197 case PPP_CCP: 1198 ppp_ccp(sc, m, 0); 1199 break; 1200 #endif /* PPP_COMPRESS */ 1201 } 1202 1203 #ifdef PPP_COMPRESS 1204 if (protocol != PPP_LCP && protocol != PPP_CCP && 1205 sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1206 struct mbuf *mcomp = NULL; 1207 int slen; 1208 1209 slen = 0; 1210 for (mp = m; mp != NULL; mp = mp->m_next) 1211 slen += mp->m_len; 1212 (*sc->sc_xcomp->compress) 1213 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1214 if (mcomp != NULL) { 1215 if (sc->sc_flags & SC_CCP_UP) { 1216 /* 1217 * Send the compressed packet instead of the 1218 * original. 1219 */ 1220 m_freem(m); 1221 m = mcomp; 1222 cp = mtod(m, u_char *); 1223 protocol = cp[3]; 1224 } else { 1225 /* 1226 * Can't transmit compressed packets until CCP 1227 * is up. 1228 */ 1229 m_freem(mcomp); 1230 } 1231 } 1232 } 1233 #endif /* PPP_COMPRESS */ 1234 1235 /* 1236 * Compress the address/control and protocol, if possible. 1237 */ 1238 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1239 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1240 protocol != PPP_LCP) { 1241 /* can compress address/control */ 1242 m->m_data += 2; 1243 m->m_len -= 2; 1244 } 1245 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1246 /* can compress protocol */ 1247 if (mtod(m, u_char *) == cp) { 1248 cp[2] = cp[1]; /* move address/control up */ 1249 cp[1] = cp[0]; 1250 } 1251 ++m->m_data; 1252 --m->m_len; 1253 } 1254 1255 return m; 1256 } 1257 1258 /* 1259 * Software interrupt routine, called at splsoftnet. 1260 */ 1261 static void 1262 pppintr(void *arg) 1263 { 1264 struct ppp_softc *sc = arg; 1265 struct mbuf *m; 1266 int s; 1267 1268 mutex_enter(softnet_lock); 1269 if (!(sc->sc_flags & SC_TBUSY) && 1270 (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || 1271 sc->sc_fastq.ifq_head || 1272 sc->sc_outm)) { 1273 s = splhigh(); /* XXX IMP ME HARDER */ 1274 sc->sc_flags |= SC_TBUSY; 1275 splx(s); 1276 (*sc->sc_start)(sc); 1277 } 1278 for (;;) { 1279 s = splnet(); 1280 IF_DEQUEUE(&sc->sc_rawq, m); 1281 splx(s); 1282 if (m == NULL) 1283 break; 1284 ppp_inproc(sc, m); 1285 } 1286 mutex_exit(softnet_lock); 1287 } 1288 1289 #ifdef PPP_COMPRESS 1290 /* 1291 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1292 * 0 if it is about to be transmitted. 1293 */ 1294 static void 1295 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1296 { 1297 u_char *dp, *ep; 1298 struct mbuf *mp; 1299 int slen, s; 1300 1301 /* 1302 * Get a pointer to the data after the PPP header. 1303 */ 1304 if (m->m_len <= PPP_HDRLEN) { 1305 mp = m->m_next; 1306 if (mp == NULL) 1307 return; 1308 dp = mtod(mp, u_char *); 1309 } else { 1310 mp = m; 1311 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1312 } 1313 1314 ep = mtod(mp, u_char *) + mp->m_len; 1315 if (dp + CCP_HDRLEN > ep) 1316 return; 1317 slen = CCP_LENGTH(dp); 1318 if (dp + slen > ep) { 1319 if (sc->sc_flags & SC_DEBUG) 1320 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1321 dp, slen, mtod(mp, u_char *), mp->m_len); 1322 return; 1323 } 1324 1325 switch (CCP_CODE(dp)) { 1326 case CCP_CONFREQ: 1327 case CCP_TERMREQ: 1328 case CCP_TERMACK: 1329 /* CCP must be going down - disable compression */ 1330 if (sc->sc_flags & SC_CCP_UP) { 1331 s = splhigh(); /* XXX IMP ME HARDER */ 1332 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1333 splx(s); 1334 } 1335 break; 1336 1337 case CCP_CONFACK: 1338 if (sc->sc_flags & SC_CCP_OPEN && 1339 !(sc->sc_flags & SC_CCP_UP) && 1340 slen >= CCP_HDRLEN + CCP_OPT_MINLEN && 1341 slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1342 if (!rcvd) { 1343 /* We're agreeing to send compressed packets. */ 1344 if (sc->sc_xc_state != NULL && 1345 (*sc->sc_xcomp->comp_init)(sc->sc_xc_state, 1346 dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1347 sc->sc_unit, 0, 1348 sc->sc_flags & SC_DEBUG)) { 1349 s = splhigh(); /* XXX IMP ME HARDER */ 1350 sc->sc_flags |= SC_COMP_RUN; 1351 splx(s); 1352 } 1353 } else { 1354 /* 1355 * Peer is agreeing to send compressed 1356 * packets. 1357 */ 1358 if (sc->sc_rc_state != NULL && 1359 (*sc->sc_rcomp->decomp_init)( 1360 sc->sc_rc_state, 1361 dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1362 sc->sc_unit, 0, sc->sc_mru, 1363 sc->sc_flags & SC_DEBUG)) { 1364 s = splhigh(); /* XXX IMP ME HARDER */ 1365 sc->sc_flags |= SC_DECOMP_RUN; 1366 sc->sc_flags &= 1367 ~(SC_DC_ERROR | SC_DC_FERROR); 1368 splx(s); 1369 } 1370 } 1371 } 1372 break; 1373 1374 case CCP_RESETACK: 1375 if (sc->sc_flags & SC_CCP_UP) { 1376 if (!rcvd) { 1377 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1378 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1379 } else { 1380 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1381 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1382 s = splhigh(); /* XXX IMP ME HARDER */ 1383 sc->sc_flags &= ~SC_DC_ERROR; 1384 splx(s); 1385 } 1386 } 1387 } 1388 break; 1389 } 1390 } 1391 1392 /* 1393 * CCP is down; free (de)compressor state if necessary. 1394 */ 1395 static void 1396 ppp_ccp_closed(struct ppp_softc *sc) 1397 { 1398 if (sc->sc_xc_state) { 1399 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1400 ppp_compressor_rele(sc->sc_xcomp); 1401 sc->sc_xc_state = NULL; 1402 } 1403 if (sc->sc_rc_state) { 1404 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1405 ppp_compressor_rele(sc->sc_rcomp); 1406 sc->sc_rc_state = NULL; 1407 } 1408 } 1409 #endif /* PPP_COMPRESS */ 1410 1411 /* 1412 * PPP packet input routine. 1413 * The caller has checked and removed the FCS and has inserted 1414 * the address/control bytes and the protocol high byte if they 1415 * were omitted. 1416 */ 1417 void 1418 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1419 { 1420 int s = splhigh(); /* XXX IMP ME HARDER */ 1421 1422 if (lost) 1423 m->m_flags |= M_ERRMARK; 1424 IF_ENQUEUE(&sc->sc_rawq, m); 1425 softint_schedule(sc->sc_si); 1426 splx(s); 1427 } 1428 1429 /* 1430 * Process a received PPP packet, doing decompression as necessary. 1431 * Should be called at splsoftnet. 1432 */ 1433 #define COMPTYPE(proto) \ 1434 ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP \ 1435 : TYPE_UNCOMPRESSED_TCP) 1436 1437 static void 1438 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1439 { 1440 struct ifnet *ifp = &sc->sc_if; 1441 pktqueue_t *pktq = NULL; 1442 struct ifqueue *inq = NULL; 1443 int s, ilen, proto, rv; 1444 u_char *cp, adrs, ctrl; 1445 struct mbuf *mp, *dmp = NULL; 1446 #ifdef VJC 1447 int xlen; 1448 u_char *iphdr; 1449 u_int hlen; 1450 #endif 1451 1452 sc->sc_stats.ppp_ipackets++; 1453 1454 if (sc->sc_flags & SC_LOG_INPKT) { 1455 ilen = 0; 1456 for (mp = m; mp != NULL; mp = mp->m_next) 1457 ilen += mp->m_len; 1458 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1459 pppdumpm(m); 1460 } 1461 1462 cp = mtod(m, u_char *); 1463 adrs = PPP_ADDRESS(cp); 1464 ctrl = PPP_CONTROL(cp); 1465 proto = PPP_PROTOCOL(cp); 1466 1467 if (m->m_flags & M_ERRMARK) { 1468 m->m_flags &= ~M_ERRMARK; 1469 s = splhigh(); /* XXX IMP ME HARDER */ 1470 sc->sc_flags |= SC_VJ_RESET; 1471 splx(s); 1472 } 1473 1474 #ifdef PPP_COMPRESS 1475 /* 1476 * Decompress this packet if necessary, update the receiver's 1477 * dictionary, or take appropriate action on a CCP packet. 1478 */ 1479 if (proto == PPP_COMP && 1480 sc->sc_rc_state && 1481 (sc->sc_flags & SC_DECOMP_RUN) && 1482 !(sc->sc_flags & SC_DC_ERROR) && 1483 !(sc->sc_flags & SC_DC_FERROR)) { 1484 /* Decompress this packet */ 1485 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1486 if (rv == DECOMP_OK) { 1487 m_freem(m); 1488 if (dmp == NULL) { 1489 /* 1490 * No error, but no decompressed packet 1491 * produced 1492 */ 1493 return; 1494 } 1495 m = dmp; 1496 cp = mtod(m, u_char *); 1497 proto = PPP_PROTOCOL(cp); 1498 1499 } else { 1500 /* 1501 * An error has occurred in decompression. 1502 * Pass the compressed packet up to pppd, which may 1503 * take CCP down or issue a Reset-Req. 1504 */ 1505 if (sc->sc_flags & SC_DEBUG) 1506 printf("%s: decompress failed %d\n", 1507 ifp->if_xname, rv); 1508 s = splhigh(); /* XXX IMP ME HARDER */ 1509 sc->sc_flags |= SC_VJ_RESET; 1510 if (rv == DECOMP_ERROR) 1511 sc->sc_flags |= SC_DC_ERROR; 1512 else 1513 sc->sc_flags |= SC_DC_FERROR; 1514 splx(s); 1515 } 1516 1517 } else { 1518 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1519 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1520 if (proto == PPP_CCP) 1521 ppp_ccp(sc, m, 1); 1522 } 1523 #endif 1524 1525 ilen = 0; 1526 for (mp = m; mp != NULL; mp = mp->m_next) 1527 ilen += mp->m_len; 1528 1529 #ifdef VJC 1530 if (sc->sc_flags & SC_VJ_RESET) { 1531 /* 1532 * If we've missed a packet, we must toss subsequent compressed 1533 * packets which don't have an explicit connection ID. 1534 */ 1535 if (sc->sc_comp) 1536 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1537 s = splhigh(); /* XXX IMP ME HARDER */ 1538 sc->sc_flags &= ~SC_VJ_RESET; 1539 splx(s); 1540 } 1541 1542 /* 1543 * See if we have a VJ-compressed packet to uncompress. 1544 */ 1545 if (proto == PPP_VJC_COMP) { 1546 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1547 goto bad; 1548 1549 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1550 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1551 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1552 if (xlen <= 0) { 1553 if (sc->sc_flags & SC_DEBUG) { 1554 printf("%s: VJ uncompress failed" 1555 " on type comp\n", 1556 ifp->if_xname); 1557 } 1558 goto bad; 1559 } 1560 1561 /* Copy the PPP and IP headers into a new mbuf. */ 1562 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1563 if (mp == NULL) 1564 goto bad; 1565 mp->m_len = 0; 1566 mp->m_next = NULL; 1567 if (hlen + PPP_HDRLEN > MHLEN) { 1568 MCLGET(mp, M_DONTWAIT); 1569 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1570 /* Lose if big headers and no clusters */ 1571 m_freem(mp); 1572 goto bad; 1573 } 1574 } 1575 cp = mtod(mp, u_char *); 1576 cp[0] = adrs; 1577 cp[1] = ctrl; 1578 cp[2] = 0; 1579 cp[3] = PPP_IP; 1580 proto = PPP_IP; 1581 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1582 mp->m_len = hlen + PPP_HDRLEN; 1583 1584 /* 1585 * Trim the PPP and VJ headers off the old mbuf 1586 * and stick the new and old mbufs together. 1587 */ 1588 m->m_data += PPP_HDRLEN + xlen; 1589 m->m_len -= PPP_HDRLEN + xlen; 1590 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1591 bcopy(mtod(m, u_char *), 1592 mtod(mp, u_char *) + mp->m_len, m->m_len); 1593 mp->m_len += m->m_len; 1594 mp->m_next = m_free(m); 1595 } else 1596 mp->m_next = m; 1597 m = mp; 1598 ilen += hlen - xlen; 1599 1600 } else if (proto == PPP_VJC_UNCOMP) { 1601 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1602 goto bad; 1603 1604 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1605 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1606 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1607 if (xlen < 0) { 1608 if (sc->sc_flags & SC_DEBUG) { 1609 printf("%s: VJ uncompress failed" 1610 " on type uncomp\n", 1611 ifp->if_xname); 1612 } 1613 goto bad; 1614 } 1615 1616 proto = PPP_IP; 1617 cp[3] = PPP_IP; 1618 } 1619 #endif /* VJC */ 1620 1621 /* 1622 * If the packet will fit in a header mbuf, don't waste a 1623 * whole cluster on it. 1624 */ 1625 if (ilen <= MHLEN && (m->m_flags & M_EXT)) { 1626 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1627 if (mp != NULL) { 1628 m_copydata(m, 0, ilen, mtod(mp, void *)); 1629 m_freem(m); 1630 m = mp; 1631 m->m_len = ilen; 1632 } 1633 } 1634 m->m_pkthdr.len = ilen; 1635 m_set_rcvif(m, ifp); 1636 1637 if ((proto & 0x8000) == 0) { 1638 #ifdef PPP_FILTER 1639 /* 1640 * See whether we want to pass this packet, and 1641 * if it counts as link activity. 1642 */ 1643 if (sc->sc_pass_filt_in.bf_insns != 0 && 1644 bpf_filter(sc->sc_pass_filt_in.bf_insns, 1645 (u_char *)m, ilen, 0) == 0) { 1646 /* drop this packet */ 1647 m_freem(m); 1648 return; 1649 } 1650 if (sc->sc_active_filt_in.bf_insns == 0 || 1651 bpf_filter(sc->sc_active_filt_in.bf_insns, 1652 (u_char *)m, ilen, 0)) 1653 sc->sc_last_recv = time_second; 1654 #else 1655 /* 1656 * Record the time that we received this packet. 1657 */ 1658 sc->sc_last_recv = time_second; 1659 #endif /* PPP_FILTER */ 1660 } 1661 1662 /* See if bpf wants to look at the packet. */ 1663 bpf_mtap(&sc->sc_if, m, BPF_D_IN); 1664 1665 switch (proto) { 1666 #ifdef INET 1667 case PPP_IP: 1668 /* 1669 * IP packet - take off the ppp header and pass it up to IP. 1670 */ 1671 if ((ifp->if_flags & IFF_UP) == 0 || 1672 sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1673 /* Interface is down - drop the packet. */ 1674 m_freem(m); 1675 return; 1676 } 1677 m->m_pkthdr.len -= PPP_HDRLEN; 1678 m->m_data += PPP_HDRLEN; 1679 m->m_len -= PPP_HDRLEN; 1680 #ifdef GATEWAY 1681 if (ipflow_fastforward(m)) 1682 return; 1683 #endif 1684 pktq = ip_pktq; 1685 break; 1686 #endif 1687 1688 #ifdef INET6 1689 case PPP_IPV6: 1690 /* 1691 * IPv6 packet - take off the ppp header and pass it up to 1692 * IPv6. 1693 */ 1694 if ((ifp->if_flags & IFF_UP) == 0 || 1695 sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1696 /* interface is down - drop the packet. */ 1697 m_freem(m); 1698 return; 1699 } 1700 m->m_pkthdr.len -= PPP_HDRLEN; 1701 m->m_data += PPP_HDRLEN; 1702 m->m_len -= PPP_HDRLEN; 1703 #ifdef GATEWAY 1704 if (ip6flow_fastforward(&m)) 1705 return; 1706 #endif 1707 pktq = ip6_pktq; 1708 break; 1709 #endif 1710 1711 default: 1712 /* 1713 * Some other protocol - place on input queue for read(). 1714 */ 1715 inq = &sc->sc_inq; 1716 pktq = NULL; 1717 break; 1718 } 1719 1720 /* 1721 * Put the packet on the appropriate input queue. 1722 */ 1723 s = splnet(); 1724 1725 /* pktq: inet or inet6 cases */ 1726 if (__predict_true(pktq)) { 1727 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1728 splx(s); 1729 if_statinc(ifp, if_iqdrops); 1730 goto bad; 1731 } 1732 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1733 splx(s); 1734 return; 1735 } 1736 1737 /* ifq: other protocol cases */ 1738 if (!inq) { 1739 splx(s); 1740 goto bad; 1741 } 1742 if (IF_QFULL(inq)) { 1743 IF_DROP(inq); 1744 splx(s); 1745 if (sc->sc_flags & SC_DEBUG) 1746 printf("%s: input queue full\n", ifp->if_xname); 1747 if_statinc(ifp, if_iqdrops); 1748 goto bad; 1749 } 1750 IF_ENQUEUE(inq, m); 1751 splx(s); 1752 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1753 1754 (*sc->sc_ctlp)(sc); 1755 1756 return; 1757 1758 bad: 1759 m_freem(m); 1760 if_statinc(&sc->sc_if, if_ierrors); 1761 sc->sc_stats.ppp_ierrors++; 1762 } 1763 1764 #define MAX_DUMP_BYTES 128 1765 1766 static void 1767 pppdumpm(struct mbuf *m0) 1768 { 1769 char buf[3*MAX_DUMP_BYTES+4]; 1770 char *bp = buf; 1771 struct mbuf *m; 1772 1773 for (m = m0; m; m = m->m_next) { 1774 int l = m->m_len; 1775 u_char *rptr = (u_char *)m->m_data; 1776 1777 while (l--) { 1778 if (bp > buf + sizeof(buf) - 4) 1779 goto done; 1780 /* Convert byte to ascii hex */ 1781 *bp++ = hexdigits[*rptr >> 4]; 1782 *bp++ = hexdigits[*rptr++ & 0xf]; 1783 } 1784 1785 if (m->m_next) { 1786 if (bp > buf + sizeof(buf) - 3) 1787 goto done; 1788 *bp++ = '|'; 1789 } else 1790 *bp++ = ' '; 1791 } 1792 done: 1793 if (m) 1794 *bp++ = '>'; 1795 *bp = 0; 1796 printf("%s\n", buf); 1797 } 1798 1799 #ifdef ALTQ 1800 /* 1801 * A wrapper to transmit a packet from if_start since ALTQ uses 1802 * if_start to send a packet. 1803 */ 1804 static void 1805 ppp_ifstart(struct ifnet *ifp) 1806 { 1807 struct ppp_softc *sc; 1808 1809 sc = ifp->if_softc; 1810 (*sc->sc_start)(sc); 1811 } 1812 #endif 1813 1814 static const struct ppp_known_compressor { 1815 uint8_t code; 1816 const char *module; 1817 } ppp_known_compressors[] = { 1818 { CI_DEFLATE, "ppp_deflate" }, 1819 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1820 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1821 { CI_MPPE, "ppp_mppe" }, 1822 { 0, NULL } 1823 }; 1824 1825 static int 1826 ppp_compressor_init(void) 1827 { 1828 1829 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1830 return 0; 1831 } 1832 1833 static int 1834 ppp_compressor_destroy(void) 1835 { 1836 1837 mutex_destroy(&ppp_compressors_mtx); 1838 return 0; 1839 } 1840 1841 static void 1842 ppp_compressor_rele(struct compressor *cp) 1843 { 1844 1845 mutex_enter(&ppp_compressors_mtx); 1846 --cp->comp_refcnt; 1847 mutex_exit(&ppp_compressors_mtx); 1848 } 1849 1850 static struct compressor * 1851 ppp_get_compressor_noload(uint8_t ci, bool hold) 1852 { 1853 struct compressor *cp; 1854 1855 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1856 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1857 if (cp->compress_proto == ci) { 1858 if (hold) 1859 ++cp->comp_refcnt; 1860 return cp; 1861 } 1862 } 1863 1864 return NULL; 1865 } 1866 1867 static struct compressor * 1868 ppp_get_compressor(uint8_t ci) 1869 { 1870 struct compressor *cp = NULL; 1871 const struct ppp_known_compressor *pkc; 1872 1873 mutex_enter(&ppp_compressors_mtx); 1874 cp = ppp_get_compressor_noload(ci, true); 1875 mutex_exit(&ppp_compressors_mtx); 1876 if (cp != NULL) 1877 return cp; 1878 1879 kernconfig_lock(); 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 /* Not found, so try to autoload a module */ 1885 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1886 if (pkc->code == ci) { 1887 if (module_autoload(pkc->module, 1888 MODULE_CLASS_MISC) != 0) 1889 break; 1890 mutex_enter(&ppp_compressors_mtx); 1891 cp = ppp_get_compressor_noload(ci, true); 1892 mutex_exit(&ppp_compressors_mtx); 1893 break; 1894 } 1895 } 1896 } 1897 kernconfig_unlock(); 1898 1899 return cp; 1900 } 1901 1902 int 1903 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1904 { 1905 int error = 0; 1906 size_t i; 1907 1908 mutex_enter(&ppp_compressors_mtx); 1909 for (i = 0; i < ncomp; i++) { 1910 if (ppp_get_compressor_noload(pc[i].compress_proto, 1911 false) != NULL) 1912 error = EEXIST; 1913 } 1914 if (!error) { 1915 for (i = 0; i < ncomp; i++) { 1916 pc[i].comp_refcnt = 0; 1917 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1918 } 1919 } 1920 mutex_exit(&ppp_compressors_mtx); 1921 1922 return error; 1923 } 1924 1925 int 1926 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1927 { 1928 int error = 0; 1929 size_t i; 1930 1931 mutex_enter(&ppp_compressors_mtx); 1932 for (i = 0; i < ncomp; i++) { 1933 if (ppp_get_compressor_noload(pc[i].compress_proto, 1934 false) != &pc[i]) 1935 error = ENOENT; 1936 else if (pc[i].comp_refcnt != 0) 1937 error = EBUSY; 1938 } 1939 if (!error) { 1940 for (i = 0; i < ncomp; i++) { 1941 LIST_REMOVE(&pc[i], comp_list); 1942 } 1943 } 1944 mutex_exit(&ppp_compressors_mtx); 1945 1946 return error; 1947 } 1948 1949 /* 1950 * Module infrastructure 1951 */ 1952 #include "if_module.h" 1953 1954 #ifdef PPP_FILTER 1955 #define PPP_DEP "bpf_filter," 1956 #else 1957 #define PPP_DEP 1958 #endif 1959 1960 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1961
Indexes created Wed Sep 24 15:09:51 GMT 2025