if_ppp.c revision 1.165
1 /* $NetBSD: if_ppp.c,v 1.165 2019/06/25 12:30:50 msaitoh 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 1.165 2019/06/25 12:30:50 msaitoh 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 * Some useful mbuf macros not in mbuf.h. 185 */ 186 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 187 188 #define M_DATASTART(m) \ 189 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 190 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 191 192 #define M_DATASIZE(m) \ 193 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 194 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 195 196 /* 197 * We define two link layer specific mbuf flags, to mark high-priority 198 * packets for output, and received packets following lost/corrupted 199 * packets. 200 */ 201 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 202 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 203 204 static int ppp_clone_create(struct if_clone *, int); 205 static int ppp_clone_destroy(struct ifnet *); 206 207 static struct ppp_softc *ppp_create(const char *, int); 208 209 static struct { 210 LIST_HEAD(ppp_sclist, ppp_softc) list; 211 kmutex_t lock; 212 } ppp_softcs __cacheline_aligned; 213 214 struct if_clone ppp_cloner = 215 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 216 217 #ifdef PPP_COMPRESS 218 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 219 static kmutex_t ppp_compressors_mtx; 220 221 static int ppp_compressor_init(void); 222 static int ppp_compressor_destroy(void); 223 static struct compressor *ppp_get_compressor(uint8_t); 224 static void ppp_compressor_rele(struct compressor *); 225 #endif /* PPP_COMPRESS */ 226 227 228 /* 229 * Called from boot code to establish ppp interfaces. 230 */ 231 void 232 pppattach(int n __unused) 233 { 234 235 /* 236 * Nothing to do here, initialization is handled by the 237 * module initialization code in pppinit() below). 238 */ 239 } 240 241 static void 242 pppinit(void) 243 { 244 /* Init the compressor sub-sub-system */ 245 ppp_compressor_init(); 246 247 if (ttyldisc_attach(&ppp_disc) != 0) 248 panic("%s", __func__); 249 250 mutex_init(&ppp_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 251 LIST_INIT(&ppp_softcs.list); 252 if_clone_attach(&ppp_cloner); 253 } 254 255 static int 256 pppdetach(void) 257 { 258 int error = 0; 259 260 if (!LIST_EMPTY(&ppp_softcs.list)) 261 error = EBUSY; 262 263 if (error == 0) 264 error = ttyldisc_detach(&ppp_disc); 265 266 if (error == 0) { 267 mutex_destroy(&ppp_softcs.lock); 268 if_clone_detach(&ppp_cloner); 269 ppp_compressor_destroy(); 270 } 271 272 return error; 273 } 274 275 static struct ppp_softc * 276 ppp_create(const char *name, int unit) 277 { 278 struct ppp_softc *sc, *sci, *scl = NULL; 279 280 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 281 282 mutex_enter(&ppp_softcs.lock); 283 if (unit == -1) { 284 int i = 0; 285 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 286 scl = sci; 287 if (i < sci->sc_unit) { 288 unit = i; 289 break; 290 } else { 291 #ifdef DIAGNOSTIC 292 KASSERT(i == sci->sc_unit); 293 #endif 294 i++; 295 } 296 } 297 if (unit == -1) 298 unit = i; 299 } else { 300 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 301 scl = sci; 302 if (unit < sci->sc_unit) 303 break; 304 else if (unit == sci->sc_unit) { 305 free(sc, M_DEVBUF); 306 mutex_exit(&ppp_softcs.lock); 307 return NULL; 308 } 309 } 310 } 311 312 if (sci != NULL) 313 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 314 else if (scl != NULL) 315 LIST_INSERT_AFTER(scl, sc, sc_iflist); 316 else 317 LIST_INSERT_HEAD(&ppp_softcs.list, sc, sc_iflist); 318 319 mutex_exit(&ppp_softcs.lock); 320 321 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 322 callout_init(&sc->sc_timo_ch, 0); 323 sc->sc_if.if_softc = sc; 324 sc->sc_if.if_mtu = PPP_MTU; 325 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 326 sc->sc_if.if_type = IFT_PPP; 327 sc->sc_if.if_hdrlen = PPP_HDRLEN; 328 sc->sc_if.if_dlt = DLT_NULL; 329 sc->sc_if.if_ioctl = pppsioctl; 330 sc->sc_if.if_output = pppoutput; 331 #ifdef ALTQ 332 sc->sc_if.if_start = ppp_ifstart; 333 #endif 334 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 335 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 336 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 337 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 338 /* Ratio of 1:2 packets between the regular and the fast queue */ 339 sc->sc_maxfastq = 2; 340 IFQ_SET_READY(&sc->sc_if.if_snd); 341 if_attach(&sc->sc_if); 342 if_alloc_sadl(&sc->sc_if); 343 bpf_attach(&sc->sc_if, DLT_NULL, 0); 344 return sc; 345 } 346 347 static int 348 ppp_clone_create(struct if_clone *ifc, int unit) 349 { 350 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 351 } 352 353 static int 354 ppp_clone_destroy(struct ifnet *ifp) 355 { 356 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 357 358 if (sc->sc_devp != NULL) 359 return EBUSY; /* Not removing it */ 360 361 mutex_enter(&ppp_softcs.lock); 362 LIST_REMOVE(sc, sc_iflist); 363 mutex_exit(&ppp_softcs.lock); 364 365 bpf_detach(ifp); 366 if_detach(ifp); 367 368 free(sc, M_DEVBUF); 369 return 0; 370 } 371 372 /* 373 * Allocate a ppp interface unit and initialize it. 374 */ 375 struct ppp_softc * 376 pppalloc(pid_t pid) 377 { 378 struct ppp_softc *sc = NULL, *scf; 379 int i; 380 381 mutex_enter(&ppp_softcs.lock); 382 LIST_FOREACH(scf, &ppp_softcs.list, sc_iflist) { 383 if (scf->sc_xfer == pid) { 384 scf->sc_xfer = 0; 385 mutex_exit(&ppp_softcs.lock); 386 return scf; 387 } 388 if (scf->sc_devp == NULL && sc == NULL) 389 sc = scf; 390 } 391 mutex_exit(&ppp_softcs.lock); 392 393 if (sc == NULL) 394 sc = ppp_create(ppp_cloner.ifc_name, -1); 395 396 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 397 if (sc->sc_si == NULL) { 398 printf("%s: unable to establish softintr\n", 399 sc->sc_if.if_xname); 400 return (NULL); 401 } 402 sc->sc_flags = 0; 403 sc->sc_mru = PPP_MRU; 404 sc->sc_relinq = NULL; 405 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 406 #ifdef VJC 407 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 408 if (sc->sc_comp) 409 sl_compress_init(sc->sc_comp); 410 #endif 411 #ifdef PPP_COMPRESS 412 sc->sc_xc_state = NULL; 413 sc->sc_rc_state = NULL; 414 #endif /* PPP_COMPRESS */ 415 for (i = 0; i < NUM_NP; ++i) 416 sc->sc_npmode[i] = NPMODE_ERROR; 417 sc->sc_npqueue = NULL; 418 sc->sc_npqtail = &sc->sc_npqueue; 419 sc->sc_last_sent = sc->sc_last_recv = time_second; 420 421 return sc; 422 } 423 424 /* 425 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 426 */ 427 void 428 pppdealloc(struct ppp_softc *sc) 429 { 430 struct mbuf *m; 431 432 softint_disestablish(sc->sc_si); 433 if_down(&sc->sc_if); 434 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 435 sc->sc_devp = NULL; 436 sc->sc_xfer = 0; 437 for (;;) { 438 IF_DEQUEUE(&sc->sc_rawq, m); 439 if (m == NULL) 440 break; 441 m_freem(m); 442 } 443 for (;;) { 444 IF_DEQUEUE(&sc->sc_inq, m); 445 if (m == NULL) 446 break; 447 m_freem(m); 448 } 449 for (;;) { 450 IF_DEQUEUE(&sc->sc_fastq, m); 451 if (m == NULL) 452 break; 453 m_freem(m); 454 } 455 while ((m = sc->sc_npqueue) != NULL) { 456 sc->sc_npqueue = m->m_nextpkt; 457 m_freem(m); 458 } 459 if (sc->sc_togo != NULL) { 460 m_freem(sc->sc_togo); 461 sc->sc_togo = NULL; 462 } 463 #ifdef PPP_COMPRESS 464 ppp_ccp_closed(sc); 465 sc->sc_xc_state = NULL; 466 sc->sc_rc_state = NULL; 467 #endif /* PPP_COMPRESS */ 468 #ifdef PPP_FILTER 469 if (sc->sc_pass_filt_in.bf_insns != 0) { 470 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 471 sc->sc_pass_filt_in.bf_insns = 0; 472 sc->sc_pass_filt_in.bf_len = 0; 473 } 474 if (sc->sc_pass_filt_out.bf_insns != 0) { 475 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 476 sc->sc_pass_filt_out.bf_insns = 0; 477 sc->sc_pass_filt_out.bf_len = 0; 478 } 479 if (sc->sc_active_filt_in.bf_insns != 0) { 480 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 481 sc->sc_active_filt_in.bf_insns = 0; 482 sc->sc_active_filt_in.bf_len = 0; 483 } 484 if (sc->sc_active_filt_out.bf_insns != 0) { 485 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 486 sc->sc_active_filt_out.bf_insns = 0; 487 sc->sc_active_filt_out.bf_len = 0; 488 } 489 #endif /* PPP_FILTER */ 490 #ifdef VJC 491 if (sc->sc_comp != 0) { 492 free(sc->sc_comp, M_DEVBUF); 493 sc->sc_comp = 0; 494 } 495 #endif 496 (void)ppp_clone_destroy(&sc->sc_if); 497 } 498 499 /* 500 * Ioctl routine for generic ppp devices. 501 */ 502 int 503 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 504 struct lwp *l) 505 { 506 int s, error, flags, mru, npx; 507 u_int nb; 508 struct ppp_option_data *odp; 509 struct compressor *cp; 510 struct npioctl *npi; 511 time_t t; 512 #ifdef PPP_FILTER 513 struct bpf_program *bp, *nbp; 514 struct bpf_insn *newcode, *oldcode; 515 int newcodelen; 516 #endif /* PPP_FILTER */ 517 #ifdef PPP_COMPRESS 518 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 519 #endif 520 521 switch (cmd) { 522 case PPPIOCSFLAGS: 523 case PPPIOCSMRU: 524 case PPPIOCSMAXCID: 525 case PPPIOCSCOMPRESS: 526 case PPPIOCSNPMODE: 527 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 528 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 529 KAUTH_ARG(cmd), NULL) != 0) 530 return (EPERM); 531 break; 532 case PPPIOCXFERUNIT: 533 /* XXX: Why is this privileged?! */ 534 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 535 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 536 KAUTH_ARG(cmd), NULL) != 0) 537 return (EPERM); 538 break; 539 default: 540 break; 541 } 542 543 switch (cmd) { 544 case FIONREAD: 545 *(int *)data = sc->sc_inq.ifq_len; 546 break; 547 548 case PPPIOCGUNIT: 549 *(int *)data = sc->sc_unit; 550 break; 551 552 case PPPIOCGFLAGS: 553 *(u_int *)data = sc->sc_flags; 554 break; 555 556 case PPPIOCGRAWIN: 557 { 558 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 559 u_char c, q = 0; 560 561 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 562 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 563 564 for (c = 0; c < sc->sc_rawin_start;) 565 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 566 567 rwin->count = sc->sc_rawin.count; 568 } 569 break; 570 571 case PPPIOCSFLAGS: 572 flags = *(int *)data & SC_MASK; 573 s = splsoftnet(); 574 #ifdef PPP_COMPRESS 575 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 576 ppp_ccp_closed(sc); 577 #endif 578 splhigh(); /* XXX IMP ME HARDER */ 579 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 580 splx(s); 581 break; 582 583 case PPPIOCSMRU: 584 mru = *(int *)data; 585 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 586 sc->sc_mru = mru; 587 break; 588 589 case PPPIOCGMRU: 590 *(int *)data = sc->sc_mru; 591 break; 592 593 #ifdef VJC 594 case PPPIOCSMAXCID: 595 if (sc->sc_comp) { 596 s = splsoftnet(); 597 sl_compress_setup(sc->sc_comp, *(int *)data); 598 splx(s); 599 } 600 break; 601 #endif 602 603 case PPPIOCXFERUNIT: 604 sc->sc_xfer = l->l_proc->p_pid; 605 break; 606 607 #ifdef PPP_COMPRESS 608 case PPPIOCSCOMPRESS: 609 odp = (struct ppp_option_data *) data; 610 nb = odp->length; 611 if (nb > sizeof(ccp_option)) 612 nb = sizeof(ccp_option); 613 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 614 return (error); 615 /* preliminary check on the length byte */ 616 if (ccp_option[1] < 2) 617 return (EINVAL); 618 cp = ppp_get_compressor(ccp_option[0]); 619 if (cp == NULL) { 620 if (sc->sc_flags & SC_DEBUG) 621 printf("%s: no compressor for [%x %x %x], %x\n", 622 sc->sc_if.if_xname, ccp_option[0], 623 ccp_option[1], ccp_option[2], nb); 624 return (EINVAL); /* no handler found */ 625 } 626 /* 627 * Found a handler for the protocol - try to allocate 628 * a compressor or decompressor. 629 */ 630 error = 0; 631 if (odp->transmit) { 632 s = splsoftnet(); 633 if (sc->sc_xc_state != NULL) { 634 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 635 ppp_compressor_rele(sc->sc_xcomp); 636 } 637 sc->sc_xcomp = cp; 638 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 639 if (sc->sc_xc_state == NULL) { 640 if (sc->sc_flags & SC_DEBUG) 641 printf("%s: comp_alloc failed\n", 642 sc->sc_if.if_xname); 643 error = ENOBUFS; 644 } 645 splhigh(); /* XXX IMP ME HARDER */ 646 sc->sc_flags &= ~SC_COMP_RUN; 647 splx(s); 648 } else { 649 s = splsoftnet(); 650 if (sc->sc_rc_state != NULL) { 651 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 652 ppp_compressor_rele(sc->sc_rcomp); 653 } 654 sc->sc_rcomp = cp; 655 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 656 if (sc->sc_rc_state == NULL) { 657 if (sc->sc_flags & SC_DEBUG) 658 printf("%s: decomp_alloc failed\n", 659 sc->sc_if.if_xname); 660 error = ENOBUFS; 661 } 662 splhigh(); /* XXX IMP ME HARDER */ 663 sc->sc_flags &= ~SC_DECOMP_RUN; 664 splx(s); 665 } 666 return (error); 667 #endif /* PPP_COMPRESS */ 668 669 case PPPIOCGNPMODE: 670 case PPPIOCSNPMODE: 671 npi = (struct npioctl *) data; 672 switch (npi->protocol) { 673 case PPP_IP: 674 npx = NP_IP; 675 break; 676 case PPP_IPV6: 677 npx = NP_IPV6; 678 break; 679 default: 680 return EINVAL; 681 } 682 if (cmd == PPPIOCGNPMODE) { 683 npi->mode = sc->sc_npmode[npx]; 684 } else { 685 if (npi->mode != sc->sc_npmode[npx]) { 686 s = splnet(); 687 sc->sc_npmode[npx] = npi->mode; 688 if (npi->mode != NPMODE_QUEUE) { 689 ppp_requeue(sc); 690 ppp_restart(sc); 691 } 692 splx(s); 693 } 694 } 695 break; 696 697 case PPPIOCGIDLE: 698 s = splsoftnet(); 699 t = time_second; 700 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 701 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 702 splx(s); 703 break; 704 705 #ifdef PPP_FILTER 706 case PPPIOCSPASS: 707 case PPPIOCSACTIVE: 708 /* These are no longer supported. */ 709 return EOPNOTSUPP; 710 711 case PPPIOCSIPASS: 712 case PPPIOCSOPASS: 713 case PPPIOCSIACTIVE: 714 case PPPIOCSOACTIVE: 715 nbp = (struct bpf_program *) data; 716 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 717 return EINVAL; 718 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 719 if (newcodelen != 0) { 720 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 721 /* WAITOK -- malloc() never fails. */ 722 if ((error = copyin((void *)nbp->bf_insns, 723 (void *)newcode, newcodelen)) != 0) { 724 free(newcode, M_DEVBUF); 725 return error; 726 } 727 if (!bpf_validate(newcode, nbp->bf_len)) { 728 free(newcode, M_DEVBUF); 729 return EINVAL; 730 } 731 } else 732 newcode = 0; 733 switch (cmd) { 734 case PPPIOCSIPASS: 735 bp = &sc->sc_pass_filt_in; 736 break; 737 738 case PPPIOCSOPASS: 739 bp = &sc->sc_pass_filt_out; 740 break; 741 742 case PPPIOCSIACTIVE: 743 bp = &sc->sc_active_filt_in; 744 break; 745 746 case PPPIOCSOACTIVE: 747 bp = &sc->sc_active_filt_out; 748 break; 749 default: 750 free(newcode, M_DEVBUF); 751 return (EPASSTHROUGH); 752 } 753 oldcode = bp->bf_insns; 754 s = splnet(); 755 bp->bf_len = nbp->bf_len; 756 bp->bf_insns = newcode; 757 splx(s); 758 if (oldcode != 0) 759 free(oldcode, M_DEVBUF); 760 break; 761 #endif /* PPP_FILTER */ 762 763 default: 764 return (EPASSTHROUGH); 765 } 766 return (0); 767 } 768 769 /* 770 * Process an ioctl request to the ppp network interface. 771 */ 772 static int 773 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 774 { 775 struct ppp_softc *sc = ifp->if_softc; 776 struct ifaddr *ifa = (struct ifaddr *)data; 777 struct ifreq *ifr = (struct ifreq *)data; 778 struct ppp_stats *psp; 779 #ifdef PPP_COMPRESS 780 struct ppp_comp_stats *pcp; 781 #endif 782 int s = splnet(), error = 0; 783 784 switch (cmd) { 785 case SIOCSIFFLAGS: 786 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 787 break; 788 if ((ifp->if_flags & IFF_RUNNING) == 0) 789 ifp->if_flags &= ~IFF_UP; 790 break; 791 792 case SIOCINITIFADDR: 793 switch (ifa->ifa_addr->sa_family) { 794 #ifdef INET 795 case AF_INET: 796 break; 797 #endif 798 #ifdef INET6 799 case AF_INET6: 800 break; 801 #endif 802 default: 803 printf("%s: af%d not supported\n", ifp->if_xname, 804 ifa->ifa_addr->sa_family); 805 error = EAFNOSUPPORT; 806 break; 807 } 808 ifa->ifa_rtrequest = p2p_rtrequest; 809 break; 810 811 case SIOCADDMULTI: 812 case SIOCDELMULTI: 813 if (ifr == NULL) { 814 error = EAFNOSUPPORT; 815 break; 816 } 817 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 818 #ifdef INET 819 case AF_INET: 820 break; 821 #endif 822 #ifdef INET6 823 case AF_INET6: 824 break; 825 #endif 826 default: 827 error = EAFNOSUPPORT; 828 break; 829 } 830 break; 831 832 case SIOCGPPPSTATS: 833 psp = &((struct ifpppstatsreq *) data)->stats; 834 memset(psp, 0, sizeof(*psp)); 835 psp->p = sc->sc_stats; 836 #if defined(VJC) && !defined(SL_NO_STATS) 837 if (sc->sc_comp) { 838 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 839 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 840 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 841 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 842 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 843 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 844 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 845 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 846 } 847 #endif /* VJC */ 848 break; 849 850 #ifdef PPP_COMPRESS 851 case SIOCGPPPCSTATS: 852 pcp = &((struct ifpppcstatsreq *) data)->stats; 853 memset(pcp, 0, sizeof(*pcp)); 854 if (sc->sc_xc_state != NULL) 855 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 856 if (sc->sc_rc_state != NULL) 857 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 858 break; 859 #endif /* PPP_COMPRESS */ 860 861 default: 862 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 863 error = 0; 864 break; 865 } 866 splx(s); 867 return (error); 868 } 869 870 /* 871 * Queue a packet. Start transmission if not active. 872 * Packet is placed in Information field of PPP frame. 873 */ 874 int 875 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 876 const struct rtentry *rtp) 877 { 878 struct ppp_softc *sc = ifp->if_softc; 879 int protocol, address, control; 880 u_char *cp; 881 int s, error; 882 #ifdef INET 883 struct ip *ip; 884 #endif 885 struct ifqueue *ifq; 886 enum NPmode mode; 887 int len; 888 889 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 890 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 891 error = ENETDOWN; /* sort of */ 892 goto bad; 893 } 894 895 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 896 897 /* 898 * Compute PPP header. 899 */ 900 m0->m_flags &= ~M_HIGHPRI; 901 switch (dst->sa_family) { 902 #ifdef INET 903 case AF_INET: 904 address = PPP_ALLSTATIONS; 905 control = PPP_UI; 906 protocol = PPP_IP; 907 mode = sc->sc_npmode[NP_IP]; 908 909 /* 910 * If this packet has the "low delay" bit set in the IP header, 911 * put it on the fastq instead. 912 */ 913 ip = mtod(m0, struct ip *); 914 if (ip->ip_tos & IPTOS_LOWDELAY) 915 m0->m_flags |= M_HIGHPRI; 916 break; 917 #endif 918 #ifdef INET6 919 case AF_INET6: 920 address = PPP_ALLSTATIONS; /*XXX*/ 921 control = PPP_UI; /*XXX*/ 922 protocol = PPP_IPV6; 923 mode = sc->sc_npmode[NP_IPV6]; 924 925 #if 0 /* XXX flowinfo/traffic class, maybe? */ 926 /* 927 * If this packet has the "low delay" bit set in the IP header, 928 * put it on the fastq instead. 929 */ 930 ip = mtod(m0, struct ip *); 931 if (ip->ip_tos & IPTOS_LOWDELAY) 932 m0->m_flags |= M_HIGHPRI; 933 #endif 934 break; 935 #endif 936 case AF_UNSPEC: 937 address = PPP_ADDRESS(dst->sa_data); 938 control = PPP_CONTROL(dst->sa_data); 939 protocol = PPP_PROTOCOL(dst->sa_data); 940 mode = NPMODE_PASS; 941 break; 942 default: 943 printf("%s: af%d not supported\n", ifp->if_xname, 944 dst->sa_family); 945 error = EAFNOSUPPORT; 946 goto bad; 947 } 948 949 /* 950 * Drop this packet, or return an error, if necessary. 951 */ 952 if (mode == NPMODE_ERROR) { 953 error = ENETDOWN; 954 goto bad; 955 } 956 if (mode == NPMODE_DROP) { 957 error = 0; 958 goto bad; 959 } 960 961 /* 962 * Add PPP header. 963 */ 964 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 965 if (m0 == NULL) { 966 error = ENOBUFS; 967 goto bad; 968 } 969 970 cp = mtod(m0, u_char *); 971 *cp++ = address; 972 *cp++ = control; 973 *cp++ = protocol >> 8; 974 *cp++ = protocol & 0xff; 975 976 len = m_length(m0); 977 978 if (sc->sc_flags & SC_LOG_OUTPKT) { 979 printf("%s output: ", ifp->if_xname); 980 pppdumpm(m0); 981 } 982 983 if ((protocol & 0x8000) == 0) { 984 #ifdef PPP_FILTER 985 /* 986 * Apply the pass and active filters to the packet, 987 * but only if it is a data packet. 988 */ 989 if (sc->sc_pass_filt_out.bf_insns != 0 990 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 991 (u_char *)m0, len, 0) == 0) { 992 error = 0; /* drop this packet */ 993 goto bad; 994 } 995 996 /* 997 * Update the time we sent the most recent packet. 998 */ 999 if (sc->sc_active_filt_out.bf_insns == 0 1000 || bpf_filter(sc->sc_active_filt_out.bf_insns, 1001 (u_char *)m0, len, 0)) 1002 sc->sc_last_sent = time_second; 1003 #else 1004 /* 1005 * Update the time we sent the most recent packet. 1006 */ 1007 sc->sc_last_sent = time_second; 1008 #endif /* PPP_FILTER */ 1009 } 1010 1011 /* 1012 * See if bpf wants to look at the packet. 1013 */ 1014 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1015 1016 /* 1017 * Put the packet on the appropriate queue. 1018 */ 1019 s = splnet(); 1020 if (mode == NPMODE_QUEUE) { 1021 /* XXX we should limit the number of packets on this queue */ 1022 *sc->sc_npqtail = m0; 1023 m0->m_nextpkt = NULL; 1024 sc->sc_npqtail = &m0->m_nextpkt; 1025 } else { 1026 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1027 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1028 splx(s); 1029 sc->sc_if.if_oerrors++; 1030 sc->sc_stats.ppp_oerrors++; 1031 return (error); 1032 } 1033 ppp_restart(sc); 1034 } 1035 ifp->if_opackets++; 1036 ifp->if_obytes += len; 1037 1038 splx(s); 1039 return (0); 1040 1041 bad: 1042 m_freem(m0); 1043 return (error); 1044 } 1045 1046 /* 1047 * After a change in the NPmode for some NP, move packets from the 1048 * npqueue to the send queue or the fast queue as appropriate. 1049 * Should be called at splnet, since we muck with the queues. 1050 */ 1051 static void 1052 ppp_requeue(struct ppp_softc *sc) 1053 { 1054 struct mbuf *m, **mpp; 1055 struct ifqueue *ifq; 1056 enum NPmode mode; 1057 int error; 1058 1059 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1060 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1061 case PPP_IP: 1062 mode = sc->sc_npmode[NP_IP]; 1063 break; 1064 case PPP_IPV6: 1065 mode = sc->sc_npmode[NP_IPV6]; 1066 break; 1067 default: 1068 mode = NPMODE_PASS; 1069 } 1070 1071 switch (mode) { 1072 case NPMODE_PASS: 1073 /* 1074 * This packet can now go on one of the queues to 1075 * be sent. 1076 */ 1077 *mpp = m->m_nextpkt; 1078 m->m_nextpkt = NULL; 1079 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1080 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1081 sc->sc_if.if_oerrors++; 1082 sc->sc_stats.ppp_oerrors++; 1083 } 1084 break; 1085 1086 case NPMODE_DROP: 1087 case NPMODE_ERROR: 1088 *mpp = m->m_nextpkt; 1089 m_freem(m); 1090 break; 1091 1092 case NPMODE_QUEUE: 1093 mpp = &m->m_nextpkt; 1094 break; 1095 } 1096 } 1097 sc->sc_npqtail = mpp; 1098 } 1099 1100 /* 1101 * Transmitter has finished outputting some stuff; 1102 * remember to call sc->sc_start later at splsoftnet. 1103 */ 1104 void 1105 ppp_restart(struct ppp_softc *sc) 1106 { 1107 int s = splhigh(); /* XXX IMP ME HARDER */ 1108 1109 sc->sc_flags &= ~SC_TBUSY; 1110 softint_schedule(sc->sc_si); 1111 splx(s); 1112 } 1113 1114 /* 1115 * Get a packet to send. This procedure is intended to be called at 1116 * splsoftnet, since it may involve time-consuming operations such as 1117 * applying VJ compression, packet compression, address/control and/or 1118 * protocol field compression to the packet. 1119 */ 1120 struct mbuf * 1121 ppp_dequeue(struct ppp_softc *sc) 1122 { 1123 struct mbuf *m, *mp; 1124 u_char *cp; 1125 int address, control, protocol; 1126 int s; 1127 1128 /* 1129 * Grab a packet to send: first try the fast queue, then the 1130 * normal queue. 1131 */ 1132 s = splnet(); 1133 if (sc->sc_nfastq < sc->sc_maxfastq) { 1134 IF_DEQUEUE(&sc->sc_fastq, m); 1135 if (m != NULL) 1136 sc->sc_nfastq++; 1137 else 1138 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1139 } else { 1140 sc->sc_nfastq = 0; 1141 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1142 if (m == NULL) { 1143 IF_DEQUEUE(&sc->sc_fastq, m); 1144 if (m != NULL) 1145 sc->sc_nfastq++; 1146 } 1147 } 1148 splx(s); 1149 1150 if (m == NULL) 1151 return NULL; 1152 1153 ++sc->sc_stats.ppp_opackets; 1154 1155 /* 1156 * Extract the ppp header of the new packet. 1157 * The ppp header will be in one mbuf. 1158 */ 1159 cp = mtod(m, u_char *); 1160 address = PPP_ADDRESS(cp); 1161 control = PPP_CONTROL(cp); 1162 protocol = PPP_PROTOCOL(cp); 1163 1164 switch (protocol) { 1165 case PPP_IP: 1166 #ifdef VJC 1167 /* 1168 * If the packet is a TCP/IP packet, see if we can compress it. 1169 */ 1170 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1171 struct ip *ip; 1172 int type; 1173 1174 mp = m; 1175 ip = (struct ip *) (cp + PPP_HDRLEN); 1176 if (mp->m_len <= PPP_HDRLEN) { 1177 mp = mp->m_next; 1178 if (mp == NULL) 1179 break; 1180 ip = mtod(mp, struct ip *); 1181 } 1182 /* 1183 * This code assumes the IP/TCP header is in one 1184 * non-shared mbuf 1185 */ 1186 if (ip->ip_p == IPPROTO_TCP) { 1187 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1188 !(sc->sc_flags & SC_NO_TCP_CCID)); 1189 switch (type) { 1190 case TYPE_UNCOMPRESSED_TCP: 1191 protocol = PPP_VJC_UNCOMP; 1192 break; 1193 case TYPE_COMPRESSED_TCP: 1194 protocol = PPP_VJC_COMP; 1195 cp = mtod(m, u_char *); 1196 cp[0] = address; /* Header has moved */ 1197 cp[1] = control; 1198 cp[2] = 0; 1199 break; 1200 } 1201 /* Update protocol in PPP header */ 1202 cp[3] = protocol; 1203 } 1204 } 1205 #endif /* VJC */ 1206 break; 1207 1208 #ifdef PPP_COMPRESS 1209 case PPP_CCP: 1210 ppp_ccp(sc, m, 0); 1211 break; 1212 #endif /* PPP_COMPRESS */ 1213 } 1214 1215 #ifdef PPP_COMPRESS 1216 if (protocol != PPP_LCP && protocol != PPP_CCP 1217 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1218 struct mbuf *mcomp = NULL; 1219 int slen; 1220 1221 slen = 0; 1222 for (mp = m; mp != NULL; mp = mp->m_next) 1223 slen += mp->m_len; 1224 (*sc->sc_xcomp->compress) 1225 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1226 if (mcomp != NULL) { 1227 if (sc->sc_flags & SC_CCP_UP) { 1228 /* 1229 * Send the compressed packet instead of the 1230 * original. 1231 */ 1232 m_freem(m); 1233 m = mcomp; 1234 cp = mtod(m, u_char *); 1235 protocol = cp[3]; 1236 } else { 1237 /* 1238 * Can't transmit compressed packets until CCP 1239 * is up. 1240 */ 1241 m_freem(mcomp); 1242 } 1243 } 1244 } 1245 #endif /* PPP_COMPRESS */ 1246 1247 /* 1248 * Compress the address/control and protocol, if possible. 1249 */ 1250 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1251 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1252 protocol != PPP_LCP) { 1253 /* can compress address/control */ 1254 m->m_data += 2; 1255 m->m_len -= 2; 1256 } 1257 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1258 /* can compress protocol */ 1259 if (mtod(m, u_char *) == cp) { 1260 cp[2] = cp[1]; /* move address/control up */ 1261 cp[1] = cp[0]; 1262 } 1263 ++m->m_data; 1264 --m->m_len; 1265 } 1266 1267 return m; 1268 } 1269 1270 /* 1271 * Software interrupt routine, called at splsoftnet. 1272 */ 1273 static void 1274 pppintr(void *arg) 1275 { 1276 struct ppp_softc *sc = arg; 1277 struct mbuf *m; 1278 int s; 1279 1280 mutex_enter(softnet_lock); 1281 if (!(sc->sc_flags & SC_TBUSY) 1282 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1283 || sc->sc_outm)) { 1284 s = splhigh(); /* XXX IMP ME HARDER */ 1285 sc->sc_flags |= SC_TBUSY; 1286 splx(s); 1287 (*sc->sc_start)(sc); 1288 } 1289 for (;;) { 1290 s = splnet(); 1291 IF_DEQUEUE(&sc->sc_rawq, m); 1292 splx(s); 1293 if (m == NULL) 1294 break; 1295 ppp_inproc(sc, m); 1296 } 1297 mutex_exit(softnet_lock); 1298 } 1299 1300 #ifdef PPP_COMPRESS 1301 /* 1302 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1303 * 0 if it is about to be transmitted. 1304 */ 1305 static void 1306 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1307 { 1308 u_char *dp, *ep; 1309 struct mbuf *mp; 1310 int slen, s; 1311 1312 /* 1313 * Get a pointer to the data after the PPP header. 1314 */ 1315 if (m->m_len <= PPP_HDRLEN) { 1316 mp = m->m_next; 1317 if (mp == NULL) 1318 return; 1319 dp = mtod(mp, u_char *); 1320 } else { 1321 mp = m; 1322 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1323 } 1324 1325 ep = mtod(mp, u_char *) + mp->m_len; 1326 if (dp + CCP_HDRLEN > ep) 1327 return; 1328 slen = CCP_LENGTH(dp); 1329 if (dp + slen > ep) { 1330 if (sc->sc_flags & SC_DEBUG) 1331 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1332 dp, slen, mtod(mp, u_char *), mp->m_len); 1333 return; 1334 } 1335 1336 switch (CCP_CODE(dp)) { 1337 case CCP_CONFREQ: 1338 case CCP_TERMREQ: 1339 case CCP_TERMACK: 1340 /* CCP must be going down - disable compression */ 1341 if (sc->sc_flags & SC_CCP_UP) { 1342 s = splhigh(); /* XXX IMP ME HARDER */ 1343 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1344 splx(s); 1345 } 1346 break; 1347 1348 case CCP_CONFACK: 1349 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1350 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1351 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1352 if (!rcvd) { 1353 /* We're agreeing to send compressed packets. */ 1354 if (sc->sc_xc_state != NULL 1355 && (*sc->sc_xcomp->comp_init) 1356 (sc->sc_xc_state, dp + CCP_HDRLEN, 1357 slen - CCP_HDRLEN, sc->sc_unit, 0, 1358 sc->sc_flags & SC_DEBUG)) { 1359 s = splhigh(); /* XXX IMP ME HARDER */ 1360 sc->sc_flags |= SC_COMP_RUN; 1361 splx(s); 1362 } 1363 } else { 1364 /* 1365 * Peer is agreeing to send compressed 1366 * packets. 1367 */ 1368 if (sc->sc_rc_state != NULL 1369 && (*sc->sc_rcomp->decomp_init) 1370 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1371 sc->sc_unit, 0, sc->sc_mru, 1372 sc->sc_flags & SC_DEBUG)) { 1373 s = splhigh(); /* XXX IMP ME HARDER */ 1374 sc->sc_flags |= SC_DECOMP_RUN; 1375 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1376 splx(s); 1377 } 1378 } 1379 } 1380 break; 1381 1382 case CCP_RESETACK: 1383 if (sc->sc_flags & SC_CCP_UP) { 1384 if (!rcvd) { 1385 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1386 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1387 } else { 1388 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1389 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1390 s = splhigh(); /* XXX IMP ME HARDER */ 1391 sc->sc_flags &= ~SC_DC_ERROR; 1392 splx(s); 1393 } 1394 } 1395 } 1396 break; 1397 } 1398 } 1399 1400 /* 1401 * CCP is down; free (de)compressor state if necessary. 1402 */ 1403 static void 1404 ppp_ccp_closed(struct ppp_softc *sc) 1405 { 1406 if (sc->sc_xc_state) { 1407 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1408 ppp_compressor_rele(sc->sc_xcomp); 1409 sc->sc_xc_state = NULL; 1410 } 1411 if (sc->sc_rc_state) { 1412 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1413 ppp_compressor_rele(sc->sc_rcomp); 1414 sc->sc_rc_state = NULL; 1415 } 1416 } 1417 #endif /* PPP_COMPRESS */ 1418 1419 /* 1420 * PPP packet input routine. 1421 * The caller has checked and removed the FCS and has inserted 1422 * the address/control bytes and the protocol high byte if they 1423 * were omitted. 1424 */ 1425 void 1426 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1427 { 1428 int s = splhigh(); /* XXX IMP ME HARDER */ 1429 1430 if (lost) 1431 m->m_flags |= M_ERRMARK; 1432 IF_ENQUEUE(&sc->sc_rawq, m); 1433 softint_schedule(sc->sc_si); 1434 splx(s); 1435 } 1436 1437 /* 1438 * Process a received PPP packet, doing decompression as necessary. 1439 * Should be called at splsoftnet. 1440 */ 1441 #define COMPTYPE(proto) ((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 && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1487 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1488 /* Decompress this packet */ 1489 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1490 if (rv == DECOMP_OK) { 1491 m_freem(m); 1492 if (dmp == NULL) { 1493 /* 1494 * No error, but no decompressed packet 1495 * produced 1496 */ 1497 return; 1498 } 1499 m = dmp; 1500 cp = mtod(m, u_char *); 1501 proto = PPP_PROTOCOL(cp); 1502 1503 } else { 1504 /* 1505 * An error has occurred in decompression. 1506 * Pass the compressed packet up to pppd, which may 1507 * take CCP down or issue a Reset-Req. 1508 */ 1509 if (sc->sc_flags & SC_DEBUG) 1510 printf("%s: decompress failed %d\n", 1511 ifp->if_xname, rv); 1512 s = splhigh(); /* XXX IMP ME HARDER */ 1513 sc->sc_flags |= SC_VJ_RESET; 1514 if (rv == DECOMP_ERROR) 1515 sc->sc_flags |= SC_DC_ERROR; 1516 else 1517 sc->sc_flags |= SC_DC_FERROR; 1518 splx(s); 1519 } 1520 1521 } else { 1522 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1523 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1524 if (proto == PPP_CCP) 1525 ppp_ccp(sc, m, 1); 1526 } 1527 #endif 1528 1529 ilen = 0; 1530 for (mp = m; mp != NULL; mp = mp->m_next) 1531 ilen += mp->m_len; 1532 1533 #ifdef VJC 1534 if (sc->sc_flags & SC_VJ_RESET) { 1535 /* 1536 * If we've missed a packet, we must toss subsequent compressed 1537 * packets which don't have an explicit connection ID. 1538 */ 1539 if (sc->sc_comp) 1540 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1541 s = splhigh(); /* XXX IMP ME HARDER */ 1542 sc->sc_flags &= ~SC_VJ_RESET; 1543 splx(s); 1544 } 1545 1546 /* 1547 * See if we have a VJ-compressed packet to uncompress. 1548 */ 1549 if (proto == PPP_VJC_COMP) { 1550 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1551 goto bad; 1552 1553 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1554 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1555 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1556 1557 if (xlen <= 0) { 1558 if (sc->sc_flags & SC_DEBUG) 1559 printf("%s: VJ uncompress failed on type comp\n", 1560 ifp->if_xname); 1561 goto bad; 1562 } 1563 1564 /* Copy the PPP and IP headers into a new mbuf. */ 1565 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1566 if (mp == NULL) 1567 goto bad; 1568 mp->m_len = 0; 1569 mp->m_next = NULL; 1570 if (hlen + PPP_HDRLEN > MHLEN) { 1571 MCLGET(mp, M_DONTWAIT); 1572 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1573 /* Lose if big headers and no clusters */ 1574 m_freem(mp); 1575 goto bad; 1576 } 1577 } 1578 cp = mtod(mp, u_char *); 1579 cp[0] = adrs; 1580 cp[1] = ctrl; 1581 cp[2] = 0; 1582 cp[3] = PPP_IP; 1583 proto = PPP_IP; 1584 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1585 mp->m_len = hlen + PPP_HDRLEN; 1586 1587 /* 1588 * Trim the PPP and VJ headers off the old mbuf 1589 * and stick the new and old mbufs together. 1590 */ 1591 m->m_data += PPP_HDRLEN + xlen; 1592 m->m_len -= PPP_HDRLEN + xlen; 1593 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1594 bcopy(mtod(m, u_char *), 1595 mtod(mp, u_char *) + mp->m_len, m->m_len); 1596 mp->m_len += m->m_len; 1597 mp->m_next = m_free(m); 1598 } else 1599 mp->m_next = m; 1600 m = mp; 1601 ilen += hlen - xlen; 1602 1603 } else if (proto == PPP_VJC_UNCOMP) { 1604 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1605 goto bad; 1606 1607 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1608 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1609 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1610 1611 if (xlen < 0) { 1612 if (sc->sc_flags & SC_DEBUG) 1613 printf("%s: VJ uncompress failed on type uncomp\n", 1614 ifp->if_xname); 1615 goto bad; 1616 } 1617 1618 proto = PPP_IP; 1619 cp[3] = PPP_IP; 1620 } 1621 #endif /* VJC */ 1622 1623 /* 1624 * If the packet will fit in a header mbuf, don't waste a 1625 * whole cluster on it. 1626 */ 1627 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1628 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1629 if (mp != NULL) { 1630 m_copydata(m, 0, ilen, mtod(mp, void *)); 1631 m_freem(m); 1632 m = mp; 1633 m->m_len = ilen; 1634 } 1635 } 1636 m->m_pkthdr.len = ilen; 1637 m_set_rcvif(m, ifp); 1638 1639 if ((proto & 0x8000) == 0) { 1640 #ifdef PPP_FILTER 1641 /* 1642 * See whether we want to pass this packet, and 1643 * if it counts as link activity. 1644 */ 1645 if (sc->sc_pass_filt_in.bf_insns != 0 1646 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1647 (u_char *)m, ilen, 0) == 0) { 1648 /* drop this packet */ 1649 m_freem(m); 1650 return; 1651 } 1652 if (sc->sc_active_filt_in.bf_insns == 0 1653 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1654 (u_char *)m, ilen, 0)) 1655 sc->sc_last_recv = time_second; 1656 #else 1657 /* 1658 * Record the time that we received this packet. 1659 */ 1660 sc->sc_last_recv = time_second; 1661 #endif /* PPP_FILTER */ 1662 } 1663 1664 /* See if bpf wants to look at the packet. */ 1665 bpf_mtap(&sc->sc_if, m, BPF_D_IN); 1666 1667 switch (proto) { 1668 #ifdef INET 1669 case PPP_IP: 1670 /* 1671 * IP packet - take off the ppp header and pass it up to IP. 1672 */ 1673 if ((ifp->if_flags & IFF_UP) == 0 1674 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1675 /* Interface is down - drop the packet. */ 1676 m_freem(m); 1677 return; 1678 } 1679 m->m_pkthdr.len -= PPP_HDRLEN; 1680 m->m_data += PPP_HDRLEN; 1681 m->m_len -= PPP_HDRLEN; 1682 #ifdef GATEWAY 1683 if (ipflow_fastforward(m)) 1684 return; 1685 #endif 1686 pktq = ip_pktq; 1687 break; 1688 #endif 1689 1690 #ifdef INET6 1691 case PPP_IPV6: 1692 /* 1693 * IPv6 packet - take off the ppp header and pass it up to 1694 * IPv6. 1695 */ 1696 if ((ifp->if_flags & IFF_UP) == 0 1697 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1698 /* interface is down - drop the packet. */ 1699 m_freem(m); 1700 return; 1701 } 1702 m->m_pkthdr.len -= PPP_HDRLEN; 1703 m->m_data += PPP_HDRLEN; 1704 m->m_len -= PPP_HDRLEN; 1705 #ifdef GATEWAY 1706 if (ip6flow_fastforward(&m)) 1707 return; 1708 #endif 1709 pktq = ip6_pktq; 1710 break; 1711 #endif 1712 1713 default: 1714 /* 1715 * Some other protocol - place on input queue for read(). 1716 */ 1717 inq = &sc->sc_inq; 1718 pktq = NULL; 1719 break; 1720 } 1721 1722 /* 1723 * Put the packet on the appropriate input queue. 1724 */ 1725 s = splnet(); 1726 1727 /* pktq: inet or inet6 cases */ 1728 if (__predict_true(pktq)) { 1729 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1730 splx(s); 1731 ifp->if_iqdrops++; 1732 goto bad; 1733 } 1734 ifp->if_ipackets++; 1735 ifp->if_ibytes += ilen; 1736 splx(s); 1737 return; 1738 } 1739 1740 /* ifq: other protocol cases */ 1741 if (!inq) { 1742 splx(s); 1743 goto bad; 1744 } 1745 if (IF_QFULL(inq)) { 1746 IF_DROP(inq); 1747 splx(s); 1748 if (sc->sc_flags & SC_DEBUG) 1749 printf("%s: input queue full\n", ifp->if_xname); 1750 ifp->if_iqdrops++; 1751 goto bad; 1752 } 1753 IF_ENQUEUE(inq, m); 1754 splx(s); 1755 ifp->if_ipackets++; 1756 ifp->if_ibytes += ilen; 1757 1758 (*sc->sc_ctlp)(sc); 1759 1760 return; 1761 1762 bad: 1763 m_freem(m); 1764 sc->sc_if.if_ierrors++; 1765 sc->sc_stats.ppp_ierrors++; 1766 } 1767 1768 #define MAX_DUMP_BYTES 128 1769 1770 static void 1771 pppdumpm(struct mbuf *m0) 1772 { 1773 char buf[3*MAX_DUMP_BYTES+4]; 1774 char *bp = buf; 1775 struct mbuf *m; 1776 1777 for (m = m0; m; m = m->m_next) { 1778 int l = m->m_len; 1779 u_char *rptr = (u_char *)m->m_data; 1780 1781 while (l--) { 1782 if (bp > buf + sizeof(buf) - 4) 1783 goto done; 1784 /* Convert byte to ascii hex */ 1785 *bp++ = hexdigits[*rptr >> 4]; 1786 *bp++ = hexdigits[*rptr++ & 0xf]; 1787 } 1788 1789 if (m->m_next) { 1790 if (bp > buf + sizeof(buf) - 3) 1791 goto done; 1792 *bp++ = '|'; 1793 } else 1794 *bp++ = ' '; 1795 } 1796 done: 1797 if (m) 1798 *bp++ = '>'; 1799 *bp = 0; 1800 printf("%s\n", buf); 1801 } 1802 1803 #ifdef ALTQ 1804 /* 1805 * A wrapper to transmit a packet from if_start since ALTQ uses 1806 * if_start to send a packet. 1807 */ 1808 static void 1809 ppp_ifstart(struct ifnet *ifp) 1810 { 1811 struct ppp_softc *sc; 1812 1813 sc = ifp->if_softc; 1814 (*sc->sc_start)(sc); 1815 } 1816 #endif 1817 1818 static const struct ppp_known_compressor { 1819 uint8_t code; 1820 const char *module; 1821 } ppp_known_compressors[] = { 1822 { CI_DEFLATE, "ppp_deflate" }, 1823 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1824 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1825 { CI_MPPE, "ppp_mppe" }, 1826 { 0, NULL } 1827 }; 1828 1829 static int 1830 ppp_compressor_init(void) 1831 { 1832 1833 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1834 return 0; 1835 } 1836 1837 static int 1838 ppp_compressor_destroy(void) 1839 { 1840 1841 mutex_destroy(&ppp_compressors_mtx); 1842 return 0; 1843 } 1844 1845 static void 1846 ppp_compressor_rele(struct compressor *cp) 1847 { 1848 1849 mutex_enter(&ppp_compressors_mtx); 1850 --cp->comp_refcnt; 1851 mutex_exit(&ppp_compressors_mtx); 1852 } 1853 1854 static struct compressor * 1855 ppp_get_compressor_noload(uint8_t ci, bool hold) 1856 { 1857 struct compressor *cp; 1858 1859 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1860 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1861 if (cp->compress_proto == ci) { 1862 if (hold) 1863 ++cp->comp_refcnt; 1864 return cp; 1865 } 1866 } 1867 1868 return NULL; 1869 } 1870 1871 static struct compressor * 1872 ppp_get_compressor(uint8_t ci) 1873 { 1874 struct compressor *cp = NULL; 1875 const struct ppp_known_compressor *pkc; 1876 1877 mutex_enter(&ppp_compressors_mtx); 1878 cp = ppp_get_compressor_noload(ci, true); 1879 mutex_exit(&ppp_compressors_mtx); 1880 if (cp != NULL) 1881 return cp; 1882 1883 kernconfig_lock(); 1884 mutex_enter(&ppp_compressors_mtx); 1885 cp = ppp_get_compressor_noload(ci, true); 1886 mutex_exit(&ppp_compressors_mtx); 1887 if (cp == NULL) { 1888 /* Not found, so try to autoload a module */ 1889 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1890 if (pkc->code == ci) { 1891 if (module_autoload(pkc->module, 1892 MODULE_CLASS_MISC) != 0) 1893 break; 1894 mutex_enter(&ppp_compressors_mtx); 1895 cp = ppp_get_compressor_noload(ci, true); 1896 mutex_exit(&ppp_compressors_mtx); 1897 break; 1898 } 1899 } 1900 } 1901 kernconfig_unlock(); 1902 1903 return cp; 1904 } 1905 1906 int 1907 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1908 { 1909 int error = 0; 1910 size_t i; 1911 1912 mutex_enter(&ppp_compressors_mtx); 1913 for (i = 0; i < ncomp; i++) { 1914 if (ppp_get_compressor_noload(pc[i].compress_proto, 1915 false) != NULL) 1916 error = EEXIST; 1917 } 1918 if (!error) { 1919 for (i = 0; i < ncomp; i++) { 1920 pc[i].comp_refcnt = 0; 1921 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1922 } 1923 } 1924 mutex_exit(&ppp_compressors_mtx); 1925 1926 return error; 1927 } 1928 1929 int 1930 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1931 { 1932 int error = 0; 1933 size_t i; 1934 1935 mutex_enter(&ppp_compressors_mtx); 1936 for (i = 0; i < ncomp; i++) { 1937 if (ppp_get_compressor_noload(pc[i].compress_proto, 1938 false) != &pc[i]) 1939 error = ENOENT; 1940 else if (pc[i].comp_refcnt != 0) 1941 error = EBUSY; 1942 } 1943 if (!error) { 1944 for (i = 0; i < ncomp; i++) { 1945 LIST_REMOVE(&pc[i], comp_list); 1946 } 1947 } 1948 mutex_exit(&ppp_compressors_mtx); 1949 1950 return error; 1951 } 1952 1953 /* 1954 * Module infrastructure 1955 */ 1956 #include "if_module.h" 1957 1958 #ifdef PPP_FILTER 1959 #define PPP_DEP "bpf_filter," 1960 #else 1961 #define PPP_DEP 1962 #endif 1963 1964 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1965
Indexes created Tue Sep 23 13:09:54 GMT 2025