if_ppp.c revision 1.161.2.2
1 /* $NetBSD: if_ppp.c,v 1.161.2.2 2020/04/08 14:08:57 martin 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 1.161.2.2 2020/04/08 14:08:57 martin 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 LIST_HEAD(ppp_sclist, ppp_softc); 210 static struct { 211 struct ppp_sclist list; 212 kmutex_t lock; 213 } ppp_softcs __cacheline_aligned; 214 215 struct if_clone ppp_cloner = 216 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 217 218 #ifdef PPP_COMPRESS 219 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 220 static kmutex_t ppp_compressors_mtx; 221 222 static int ppp_compressor_init(void); 223 static int ppp_compressor_destroy(void); 224 static struct compressor *ppp_get_compressor(uint8_t); 225 static void ppp_compressor_rele(struct compressor *); 226 #endif /* PPP_COMPRESS */ 227 228 229 /* 230 * Called from boot code to establish ppp interfaces. 231 */ 232 void 233 pppattach(int n __unused) 234 { 235 236 /* 237 * Nothing to do here, initialization is handled by the 238 * module initialization code in pppinit() below). 239 */ 240 } 241 242 static void 243 pppinit(void) 244 { 245 /* Init the compressor sub-sub-system */ 246 ppp_compressor_init(); 247 248 if (ttyldisc_attach(&ppp_disc) != 0) 249 panic("%s", __func__); 250 251 mutex_init(&ppp_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 252 LIST_INIT(&ppp_softcs.list); 253 if_clone_attach(&ppp_cloner); 254 } 255 256 static int 257 pppdetach(void) 258 { 259 int error = 0; 260 261 if (!LIST_EMPTY(&ppp_softcs.list)) 262 error = EBUSY; 263 264 if (error == 0) 265 error = ttyldisc_detach(&ppp_disc); 266 267 if (error == 0) { 268 mutex_destroy(&ppp_softcs.lock); 269 if_clone_detach(&ppp_cloner); 270 ppp_compressor_destroy(); 271 } 272 273 return error; 274 } 275 276 static struct ppp_softc * 277 ppp_create(const char *name, int unit) 278 { 279 struct ppp_softc *sc, *sci, *scl = NULL; 280 281 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 282 283 mutex_enter(&ppp_softcs.lock); 284 if (unit == -1) { 285 int i = 0; 286 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 287 scl = sci; 288 if (i < sci->sc_unit) { 289 unit = i; 290 break; 291 } else { 292 #ifdef DIAGNOSTIC 293 KASSERT(i == sci->sc_unit); 294 #endif 295 i++; 296 } 297 } 298 if (unit == -1) 299 unit = i; 300 } else { 301 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) { 302 scl = sci; 303 if (unit < sci->sc_unit) 304 break; 305 else if (unit == sci->sc_unit) { 306 free(sc, M_DEVBUF); 307 mutex_exit(&ppp_softcs.lock); 308 return NULL; 309 } 310 } 311 } 312 313 if (sci != NULL) 314 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 315 else if (scl != NULL) 316 LIST_INSERT_AFTER(scl, sc, sc_iflist); 317 else 318 LIST_INSERT_HEAD(&ppp_softcs.list, sc, sc_iflist); 319 320 mutex_exit(&ppp_softcs.lock); 321 322 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 323 callout_init(&sc->sc_timo_ch, 0); 324 sc->sc_if.if_softc = sc; 325 sc->sc_if.if_mtu = PPP_MTU; 326 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 327 sc->sc_if.if_type = IFT_PPP; 328 sc->sc_if.if_hdrlen = PPP_HDRLEN; 329 sc->sc_if.if_dlt = DLT_NULL; 330 sc->sc_if.if_ioctl = pppsioctl; 331 sc->sc_if.if_output = pppoutput; 332 #ifdef ALTQ 333 sc->sc_if.if_start = ppp_ifstart; 334 #endif 335 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 336 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 337 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 338 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 339 /* Ratio of 1:2 packets between the regular and the fast queue */ 340 sc->sc_maxfastq = 2; 341 IFQ_SET_READY(&sc->sc_if.if_snd); 342 if_attach(&sc->sc_if); 343 if_alloc_sadl(&sc->sc_if); 344 bpf_attach(&sc->sc_if, DLT_NULL, 0); 345 return sc; 346 } 347 348 static int 349 ppp_clone_create(struct if_clone *ifc, int unit) 350 { 351 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 352 } 353 354 static int 355 ppp_clone_destroy(struct ifnet *ifp) 356 { 357 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 358 359 if (sc->sc_devp != NULL) 360 return EBUSY; /* Not removing it */ 361 362 mutex_enter(&ppp_softcs.lock); 363 LIST_REMOVE(sc, sc_iflist); 364 mutex_exit(&ppp_softcs.lock); 365 366 bpf_detach(ifp); 367 if_detach(ifp); 368 369 free(sc, M_DEVBUF); 370 return 0; 371 } 372 373 /* 374 * Allocate a ppp interface unit and initialize it. 375 */ 376 struct ppp_softc * 377 pppalloc(pid_t pid) 378 { 379 struct ppp_softc *sc = NULL, *scf; 380 int i; 381 382 mutex_enter(&ppp_softcs.lock); 383 LIST_FOREACH(scf, &ppp_softcs.list, sc_iflist) { 384 if (scf->sc_xfer == pid) { 385 scf->sc_xfer = 0; 386 mutex_exit(&ppp_softcs.lock); 387 return scf; 388 } 389 if (scf->sc_devp == NULL && sc == NULL) 390 sc = scf; 391 } 392 mutex_exit(&ppp_softcs.lock); 393 394 if (sc == NULL) 395 sc = ppp_create(ppp_cloner.ifc_name, -1); 396 397 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 398 if (sc->sc_si == NULL) { 399 printf("%s: unable to establish softintr\n", 400 sc->sc_if.if_xname); 401 return (NULL); 402 } 403 sc->sc_flags = 0; 404 sc->sc_mru = PPP_MRU; 405 sc->sc_relinq = NULL; 406 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 407 #ifdef VJC 408 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 409 if (sc->sc_comp) 410 sl_compress_init(sc->sc_comp); 411 #endif 412 #ifdef PPP_COMPRESS 413 sc->sc_xc_state = NULL; 414 sc->sc_rc_state = NULL; 415 #endif /* PPP_COMPRESS */ 416 for (i = 0; i < NUM_NP; ++i) 417 sc->sc_npmode[i] = NPMODE_ERROR; 418 sc->sc_npqueue = NULL; 419 sc->sc_npqtail = &sc->sc_npqueue; 420 sc->sc_last_sent = sc->sc_last_recv = time_second; 421 422 return sc; 423 } 424 425 /* 426 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 427 */ 428 void 429 pppdealloc(struct ppp_softc *sc) 430 { 431 struct mbuf *m; 432 433 softint_disestablish(sc->sc_si); 434 if_down(&sc->sc_if); 435 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 436 sc->sc_devp = NULL; 437 sc->sc_xfer = 0; 438 for (;;) { 439 IF_DEQUEUE(&sc->sc_rawq, m); 440 if (m == NULL) 441 break; 442 m_freem(m); 443 } 444 for (;;) { 445 IF_DEQUEUE(&sc->sc_inq, m); 446 if (m == NULL) 447 break; 448 m_freem(m); 449 } 450 for (;;) { 451 IF_DEQUEUE(&sc->sc_fastq, m); 452 if (m == NULL) 453 break; 454 m_freem(m); 455 } 456 while ((m = sc->sc_npqueue) != NULL) { 457 sc->sc_npqueue = m->m_nextpkt; 458 m_freem(m); 459 } 460 if (sc->sc_togo != NULL) { 461 m_freem(sc->sc_togo); 462 sc->sc_togo = NULL; 463 } 464 #ifdef PPP_COMPRESS 465 ppp_ccp_closed(sc); 466 sc->sc_xc_state = NULL; 467 sc->sc_rc_state = NULL; 468 #endif /* PPP_COMPRESS */ 469 #ifdef PPP_FILTER 470 if (sc->sc_pass_filt_in.bf_insns != 0) { 471 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 472 sc->sc_pass_filt_in.bf_insns = 0; 473 sc->sc_pass_filt_in.bf_len = 0; 474 } 475 if (sc->sc_pass_filt_out.bf_insns != 0) { 476 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 477 sc->sc_pass_filt_out.bf_insns = 0; 478 sc->sc_pass_filt_out.bf_len = 0; 479 } 480 if (sc->sc_active_filt_in.bf_insns != 0) { 481 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 482 sc->sc_active_filt_in.bf_insns = 0; 483 sc->sc_active_filt_in.bf_len = 0; 484 } 485 if (sc->sc_active_filt_out.bf_insns != 0) { 486 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 487 sc->sc_active_filt_out.bf_insns = 0; 488 sc->sc_active_filt_out.bf_len = 0; 489 } 490 #endif /* PPP_FILTER */ 491 #ifdef VJC 492 if (sc->sc_comp != 0) { 493 free(sc->sc_comp, M_DEVBUF); 494 sc->sc_comp = 0; 495 } 496 #endif 497 (void)ppp_clone_destroy(&sc->sc_if); 498 } 499 500 /* 501 * Ioctl routine for generic ppp devices. 502 */ 503 int 504 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 505 struct lwp *l) 506 { 507 int s, error, flags, mru, npx; 508 u_int nb; 509 struct ppp_option_data *odp; 510 struct compressor *cp; 511 struct npioctl *npi; 512 time_t t; 513 #ifdef PPP_FILTER 514 struct bpf_program *bp, *nbp; 515 struct bpf_insn *newcode, *oldcode; 516 int newcodelen; 517 #endif /* PPP_FILTER */ 518 #ifdef PPP_COMPRESS 519 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 520 #endif 521 522 switch (cmd) { 523 case PPPIOCSFLAGS: 524 case PPPIOCSMRU: 525 case PPPIOCSMAXCID: 526 case PPPIOCSCOMPRESS: 527 case PPPIOCSNPMODE: 528 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 529 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 530 KAUTH_ARG(cmd), NULL) != 0) 531 return (EPERM); 532 break; 533 case PPPIOCXFERUNIT: 534 /* XXX: Why is this privileged?! */ 535 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 536 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 537 KAUTH_ARG(cmd), NULL) != 0) 538 return (EPERM); 539 break; 540 default: 541 break; 542 } 543 544 switch (cmd) { 545 case FIONREAD: 546 *(int *)data = sc->sc_inq.ifq_len; 547 break; 548 549 case PPPIOCGUNIT: 550 *(int *)data = sc->sc_unit; 551 break; 552 553 case PPPIOCGFLAGS: 554 *(u_int *)data = sc->sc_flags; 555 break; 556 557 case PPPIOCGRAWIN: 558 { 559 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 560 u_char c, q = 0; 561 562 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 563 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 564 565 for (c = 0; c < sc->sc_rawin_start;) 566 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 567 568 rwin->count = sc->sc_rawin.count; 569 } 570 break; 571 572 case PPPIOCSFLAGS: 573 flags = *(int *)data & SC_MASK; 574 s = splsoftnet(); 575 #ifdef PPP_COMPRESS 576 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 577 ppp_ccp_closed(sc); 578 #endif 579 splhigh(); /* XXX IMP ME HARDER */ 580 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 581 splx(s); 582 break; 583 584 case PPPIOCSMRU: 585 mru = *(int *)data; 586 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 587 sc->sc_mru = mru; 588 break; 589 590 case PPPIOCGMRU: 591 *(int *)data = sc->sc_mru; 592 break; 593 594 #ifdef VJC 595 case PPPIOCSMAXCID: 596 if (sc->sc_comp) { 597 s = splsoftnet(); 598 sl_compress_setup(sc->sc_comp, *(int *)data); 599 splx(s); 600 } 601 break; 602 #endif 603 604 case PPPIOCXFERUNIT: 605 sc->sc_xfer = l->l_proc->p_pid; 606 break; 607 608 #ifdef PPP_COMPRESS 609 case PPPIOCSCOMPRESS: 610 odp = (struct ppp_option_data *) data; 611 nb = odp->length; 612 if (nb > sizeof(ccp_option)) 613 nb = sizeof(ccp_option); 614 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 615 return (error); 616 /* preliminary check on the length byte */ 617 if (ccp_option[1] < 2) 618 return (EINVAL); 619 cp = ppp_get_compressor(ccp_option[0]); 620 if (cp == NULL) { 621 if (sc->sc_flags & SC_DEBUG) 622 printf("%s: no compressor for [%x %x %x], %x\n", 623 sc->sc_if.if_xname, ccp_option[0], 624 ccp_option[1], ccp_option[2], nb); 625 return (EINVAL); /* no handler found */ 626 } 627 /* 628 * Found a handler for the protocol - try to allocate 629 * a compressor or decompressor. 630 */ 631 error = 0; 632 if (odp->transmit) { 633 s = splsoftnet(); 634 if (sc->sc_xc_state != NULL) { 635 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 636 ppp_compressor_rele(sc->sc_xcomp); 637 } 638 sc->sc_xcomp = cp; 639 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 640 if (sc->sc_xc_state == NULL) { 641 if (sc->sc_flags & SC_DEBUG) 642 printf("%s: comp_alloc failed\n", 643 sc->sc_if.if_xname); 644 error = ENOBUFS; 645 } 646 splhigh(); /* XXX IMP ME HARDER */ 647 sc->sc_flags &= ~SC_COMP_RUN; 648 splx(s); 649 } else { 650 s = splsoftnet(); 651 if (sc->sc_rc_state != NULL) { 652 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 653 ppp_compressor_rele(sc->sc_rcomp); 654 } 655 sc->sc_rcomp = cp; 656 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 657 if (sc->sc_rc_state == NULL) { 658 if (sc->sc_flags & SC_DEBUG) 659 printf("%s: decomp_alloc failed\n", 660 sc->sc_if.if_xname); 661 error = ENOBUFS; 662 } 663 splhigh(); /* XXX IMP ME HARDER */ 664 sc->sc_flags &= ~SC_DECOMP_RUN; 665 splx(s); 666 } 667 return (error); 668 #endif /* PPP_COMPRESS */ 669 670 case PPPIOCGNPMODE: 671 case PPPIOCSNPMODE: 672 npi = (struct npioctl *) data; 673 switch (npi->protocol) { 674 case PPP_IP: 675 npx = NP_IP; 676 break; 677 case PPP_IPV6: 678 npx = NP_IPV6; 679 break; 680 default: 681 return EINVAL; 682 } 683 if (cmd == PPPIOCGNPMODE) { 684 npi->mode = sc->sc_npmode[npx]; 685 } else { 686 if (npi->mode != sc->sc_npmode[npx]) { 687 s = splnet(); 688 sc->sc_npmode[npx] = npi->mode; 689 if (npi->mode != NPMODE_QUEUE) { 690 ppp_requeue(sc); 691 ppp_restart(sc); 692 } 693 splx(s); 694 } 695 } 696 break; 697 698 case PPPIOCGIDLE: 699 s = splsoftnet(); 700 t = time_second; 701 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 702 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 703 splx(s); 704 break; 705 706 #ifdef PPP_FILTER 707 case PPPIOCSPASS: 708 case PPPIOCSACTIVE: 709 /* These are no longer supported. */ 710 return EOPNOTSUPP; 711 712 case PPPIOCSIPASS: 713 case PPPIOCSOPASS: 714 case PPPIOCSIACTIVE: 715 case PPPIOCSOACTIVE: 716 nbp = (struct bpf_program *) data; 717 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 718 return EINVAL; 719 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 720 if (newcodelen != 0) { 721 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 722 /* WAITOK -- malloc() never fails. */ 723 if ((error = copyin((void *)nbp->bf_insns, 724 (void *)newcode, newcodelen)) != 0) { 725 free(newcode, M_DEVBUF); 726 return error; 727 } 728 if (!bpf_validate(newcode, nbp->bf_len)) { 729 free(newcode, M_DEVBUF); 730 return EINVAL; 731 } 732 } else 733 newcode = 0; 734 switch (cmd) { 735 case PPPIOCSIPASS: 736 bp = &sc->sc_pass_filt_in; 737 break; 738 739 case PPPIOCSOPASS: 740 bp = &sc->sc_pass_filt_out; 741 break; 742 743 case PPPIOCSIACTIVE: 744 bp = &sc->sc_active_filt_in; 745 break; 746 747 case PPPIOCSOACTIVE: 748 bp = &sc->sc_active_filt_out; 749 break; 750 default: 751 free(newcode, M_DEVBUF); 752 return (EPASSTHROUGH); 753 } 754 oldcode = bp->bf_insns; 755 s = splnet(); 756 bp->bf_len = nbp->bf_len; 757 bp->bf_insns = newcode; 758 splx(s); 759 if (oldcode != 0) 760 free(oldcode, M_DEVBUF); 761 break; 762 #endif /* PPP_FILTER */ 763 764 default: 765 return (EPASSTHROUGH); 766 } 767 return (0); 768 } 769 770 /* 771 * Process an ioctl request to the ppp network interface. 772 */ 773 static int 774 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 775 { 776 struct ppp_softc *sc = ifp->if_softc; 777 struct ifaddr *ifa = (struct ifaddr *)data; 778 struct ifreq *ifr = (struct ifreq *)data; 779 struct ppp_stats *psp; 780 #ifdef PPP_COMPRESS 781 struct ppp_comp_stats *pcp; 782 #endif 783 int s = splnet(), error = 0; 784 785 switch (cmd) { 786 case SIOCSIFFLAGS: 787 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 788 break; 789 if ((ifp->if_flags & IFF_RUNNING) == 0) 790 ifp->if_flags &= ~IFF_UP; 791 break; 792 793 case SIOCINITIFADDR: 794 switch (ifa->ifa_addr->sa_family) { 795 #ifdef INET 796 case AF_INET: 797 break; 798 #endif 799 #ifdef INET6 800 case AF_INET6: 801 break; 802 #endif 803 default: 804 printf("%s: af%d not supported\n", ifp->if_xname, 805 ifa->ifa_addr->sa_family); 806 error = EAFNOSUPPORT; 807 break; 808 } 809 ifa->ifa_rtrequest = p2p_rtrequest; 810 break; 811 812 case SIOCADDMULTI: 813 case SIOCDELMULTI: 814 if (ifr == NULL) { 815 error = EAFNOSUPPORT; 816 break; 817 } 818 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 819 #ifdef INET 820 case AF_INET: 821 break; 822 #endif 823 #ifdef INET6 824 case AF_INET6: 825 break; 826 #endif 827 default: 828 error = EAFNOSUPPORT; 829 break; 830 } 831 break; 832 833 case SIOCGPPPSTATS: 834 psp = &((struct ifpppstatsreq *) data)->stats; 835 memset(psp, 0, sizeof(*psp)); 836 psp->p = sc->sc_stats; 837 #if defined(VJC) && !defined(SL_NO_STATS) 838 if (sc->sc_comp) { 839 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 840 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 841 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 842 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 843 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 844 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 845 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 846 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 847 } 848 #endif /* VJC */ 849 break; 850 851 #ifdef PPP_COMPRESS 852 case SIOCGPPPCSTATS: 853 pcp = &((struct ifpppcstatsreq *) data)->stats; 854 memset(pcp, 0, sizeof(*pcp)); 855 if (sc->sc_xc_state != NULL) 856 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 857 if (sc->sc_rc_state != NULL) 858 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 859 break; 860 #endif /* PPP_COMPRESS */ 861 862 default: 863 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 864 error = 0; 865 break; 866 } 867 splx(s); 868 return (error); 869 } 870 871 /* 872 * Queue a packet. Start transmission if not active. 873 * Packet is placed in Information field of PPP frame. 874 */ 875 int 876 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 877 const struct rtentry *rtp) 878 { 879 struct ppp_softc *sc = ifp->if_softc; 880 int protocol, address, control; 881 u_char *cp; 882 int s, error; 883 #ifdef INET 884 struct ip *ip; 885 #endif 886 struct ifqueue *ifq; 887 enum NPmode mode; 888 int len; 889 890 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 891 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 892 error = ENETDOWN; /* sort of */ 893 goto bad; 894 } 895 896 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 897 898 /* 899 * Compute PPP header. 900 */ 901 m0->m_flags &= ~M_HIGHPRI; 902 switch (dst->sa_family) { 903 #ifdef INET 904 case AF_INET: 905 address = PPP_ALLSTATIONS; 906 control = PPP_UI; 907 protocol = PPP_IP; 908 mode = sc->sc_npmode[NP_IP]; 909 910 /* 911 * If this packet has the "low delay" bit set in the IP header, 912 * put it on the fastq instead. 913 */ 914 ip = mtod(m0, struct ip *); 915 if (ip->ip_tos & IPTOS_LOWDELAY) 916 m0->m_flags |= M_HIGHPRI; 917 break; 918 #endif 919 #ifdef INET6 920 case AF_INET6: 921 address = PPP_ALLSTATIONS; /*XXX*/ 922 control = PPP_UI; /*XXX*/ 923 protocol = PPP_IPV6; 924 mode = sc->sc_npmode[NP_IPV6]; 925 926 #if 0 /* XXX flowinfo/traffic class, maybe? */ 927 /* 928 * If this packet has the "low delay" bit set in the IP header, 929 * put it on the fastq instead. 930 */ 931 ip = mtod(m0, struct ip *); 932 if (ip->ip_tos & IPTOS_LOWDELAY) 933 m0->m_flags |= M_HIGHPRI; 934 #endif 935 break; 936 #endif 937 case AF_UNSPEC: 938 address = PPP_ADDRESS(dst->sa_data); 939 control = PPP_CONTROL(dst->sa_data); 940 protocol = PPP_PROTOCOL(dst->sa_data); 941 mode = NPMODE_PASS; 942 break; 943 default: 944 printf("%s: af%d not supported\n", ifp->if_xname, 945 dst->sa_family); 946 error = EAFNOSUPPORT; 947 goto bad; 948 } 949 950 /* 951 * Drop this packet, or return an error, if necessary. 952 */ 953 if (mode == NPMODE_ERROR) { 954 error = ENETDOWN; 955 goto bad; 956 } 957 if (mode == NPMODE_DROP) { 958 error = 0; 959 goto bad; 960 } 961 962 /* 963 * Add PPP header. 964 */ 965 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 966 if (m0 == NULL) { 967 error = ENOBUFS; 968 goto bad; 969 } 970 971 cp = mtod(m0, u_char *); 972 *cp++ = address; 973 *cp++ = control; 974 *cp++ = protocol >> 8; 975 *cp++ = protocol & 0xff; 976 977 len = m_length(m0); 978 979 if (sc->sc_flags & SC_LOG_OUTPKT) { 980 printf("%s output: ", ifp->if_xname); 981 pppdumpm(m0); 982 } 983 984 if ((protocol & 0x8000) == 0) { 985 #ifdef PPP_FILTER 986 /* 987 * Apply the pass and active filters to the packet, 988 * but only if it is a data packet. 989 */ 990 if (sc->sc_pass_filt_out.bf_insns != 0 991 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 992 (u_char *)m0, len, 0) == 0) { 993 error = 0; /* drop this packet */ 994 goto bad; 995 } 996 997 /* 998 * Update the time we sent the most recent packet. 999 */ 1000 if (sc->sc_active_filt_out.bf_insns == 0 1001 || bpf_filter(sc->sc_active_filt_out.bf_insns, 1002 (u_char *)m0, len, 0)) 1003 sc->sc_last_sent = time_second; 1004 #else 1005 /* 1006 * Update the time we sent the most recent packet. 1007 */ 1008 sc->sc_last_sent = time_second; 1009 #endif /* PPP_FILTER */ 1010 } 1011 1012 /* 1013 * See if bpf wants to look at the packet. 1014 */ 1015 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1016 1017 /* 1018 * Put the packet on the appropriate queue. 1019 */ 1020 s = splnet(); 1021 if (mode == NPMODE_QUEUE) { 1022 /* XXX we should limit the number of packets on this queue */ 1023 *sc->sc_npqtail = m0; 1024 m0->m_nextpkt = NULL; 1025 sc->sc_npqtail = &m0->m_nextpkt; 1026 } else { 1027 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1028 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1029 splx(s); 1030 if_statinc(&sc->sc_if, if_oerrors); 1031 sc->sc_stats.ppp_oerrors++; 1032 return (error); 1033 } 1034 ppp_restart(sc); 1035 } 1036 if_statadd2(ifp, if_opackets, 1, 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 if_statinc(&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 if_statinc(ifp, if_iqdrops); 1732 goto bad; 1733 } 1734 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1735 splx(s); 1736 return; 1737 } 1738 1739 /* ifq: other protocol cases */ 1740 if (!inq) { 1741 splx(s); 1742 goto bad; 1743 } 1744 if (IF_QFULL(inq)) { 1745 IF_DROP(inq); 1746 splx(s); 1747 if (sc->sc_flags & SC_DEBUG) 1748 printf("%s: input queue full\n", ifp->if_xname); 1749 if_statinc(ifp, if_iqdrops); 1750 goto bad; 1751 } 1752 IF_ENQUEUE(inq, m); 1753 splx(s); 1754 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen); 1755 1756 (*sc->sc_ctlp)(sc); 1757 1758 return; 1759 1760 bad: 1761 m_freem(m); 1762 if_statinc(&sc->sc_if, if_ierrors); 1763 sc->sc_stats.ppp_ierrors++; 1764 } 1765 1766 #define MAX_DUMP_BYTES 128 1767 1768 static void 1769 pppdumpm(struct mbuf *m0) 1770 { 1771 char buf[3*MAX_DUMP_BYTES+4]; 1772 char *bp = buf; 1773 struct mbuf *m; 1774 1775 for (m = m0; m; m = m->m_next) { 1776 int l = m->m_len; 1777 u_char *rptr = (u_char *)m->m_data; 1778 1779 while (l--) { 1780 if (bp > buf + sizeof(buf) - 4) 1781 goto done; 1782 /* Convert byte to ascii hex */ 1783 *bp++ = hexdigits[*rptr >> 4]; 1784 *bp++ = hexdigits[*rptr++ & 0xf]; 1785 } 1786 1787 if (m->m_next) { 1788 if (bp > buf + sizeof(buf) - 3) 1789 goto done; 1790 *bp++ = '|'; 1791 } else 1792 *bp++ = ' '; 1793 } 1794 done: 1795 if (m) 1796 *bp++ = '>'; 1797 *bp = 0; 1798 printf("%s\n", buf); 1799 } 1800 1801 #ifdef ALTQ 1802 /* 1803 * A wrapper to transmit a packet from if_start since ALTQ uses 1804 * if_start to send a packet. 1805 */ 1806 static void 1807 ppp_ifstart(struct ifnet *ifp) 1808 { 1809 struct ppp_softc *sc; 1810 1811 sc = ifp->if_softc; 1812 (*sc->sc_start)(sc); 1813 } 1814 #endif 1815 1816 static const struct ppp_known_compressor { 1817 uint8_t code; 1818 const char *module; 1819 } ppp_known_compressors[] = { 1820 { CI_DEFLATE, "ppp_deflate" }, 1821 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1822 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1823 { CI_MPPE, "ppp_mppe" }, 1824 { 0, NULL } 1825 }; 1826 1827 static int 1828 ppp_compressor_init(void) 1829 { 1830 1831 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1832 return 0; 1833 } 1834 1835 static int 1836 ppp_compressor_destroy(void) 1837 { 1838 1839 mutex_destroy(&ppp_compressors_mtx); 1840 return 0; 1841 } 1842 1843 static void 1844 ppp_compressor_rele(struct compressor *cp) 1845 { 1846 1847 mutex_enter(&ppp_compressors_mtx); 1848 --cp->comp_refcnt; 1849 mutex_exit(&ppp_compressors_mtx); 1850 } 1851 1852 static struct compressor * 1853 ppp_get_compressor_noload(uint8_t ci, bool hold) 1854 { 1855 struct compressor *cp; 1856 1857 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1858 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1859 if (cp->compress_proto == ci) { 1860 if (hold) 1861 ++cp->comp_refcnt; 1862 return cp; 1863 } 1864 } 1865 1866 return NULL; 1867 } 1868 1869 static struct compressor * 1870 ppp_get_compressor(uint8_t ci) 1871 { 1872 struct compressor *cp = NULL; 1873 const struct ppp_known_compressor *pkc; 1874 1875 mutex_enter(&ppp_compressors_mtx); 1876 cp = ppp_get_compressor_noload(ci, true); 1877 mutex_exit(&ppp_compressors_mtx); 1878 if (cp != NULL) 1879 return cp; 1880 1881 kernconfig_lock(); 1882 mutex_enter(&ppp_compressors_mtx); 1883 cp = ppp_get_compressor_noload(ci, true); 1884 mutex_exit(&ppp_compressors_mtx); 1885 if (cp == NULL) { 1886 /* Not found, so try to autoload a module */ 1887 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1888 if (pkc->code == ci) { 1889 if (module_autoload(pkc->module, 1890 MODULE_CLASS_MISC) != 0) 1891 break; 1892 mutex_enter(&ppp_compressors_mtx); 1893 cp = ppp_get_compressor_noload(ci, true); 1894 mutex_exit(&ppp_compressors_mtx); 1895 break; 1896 } 1897 } 1898 } 1899 kernconfig_unlock(); 1900 1901 return cp; 1902 } 1903 1904 int 1905 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1906 { 1907 int error = 0; 1908 size_t i; 1909 1910 mutex_enter(&ppp_compressors_mtx); 1911 for (i = 0; i < ncomp; i++) { 1912 if (ppp_get_compressor_noload(pc[i].compress_proto, 1913 false) != NULL) 1914 error = EEXIST; 1915 } 1916 if (!error) { 1917 for (i = 0; i < ncomp; i++) { 1918 pc[i].comp_refcnt = 0; 1919 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1920 } 1921 } 1922 mutex_exit(&ppp_compressors_mtx); 1923 1924 return error; 1925 } 1926 1927 int 1928 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1929 { 1930 int error = 0; 1931 size_t i; 1932 1933 mutex_enter(&ppp_compressors_mtx); 1934 for (i = 0; i < ncomp; i++) { 1935 if (ppp_get_compressor_noload(pc[i].compress_proto, 1936 false) != &pc[i]) 1937 error = ENOENT; 1938 else if (pc[i].comp_refcnt != 0) 1939 error = EBUSY; 1940 } 1941 if (!error) { 1942 for (i = 0; i < ncomp; i++) { 1943 LIST_REMOVE(&pc[i], comp_list); 1944 } 1945 } 1946 mutex_exit(&ppp_compressors_mtx); 1947 1948 return error; 1949 } 1950 1951 /* 1952 * Module infrastructure 1953 */ 1954 #include "if_module.h" 1955 1956 #ifdef PPP_FILTER 1957 #define PPP_DEP "bpf_filter," 1958 #else 1959 #define PPP_DEP 1960 #endif 1961 1962 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1963
Indexes created Fri Oct 03 02:09:57 GMT 2025