if_ppp.c revision 1.158
1 /* $NetBSD: if_ppp.c,v 1.158 2016/10/02 14:17:07 christos 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 1.158 2016/10/02 14:17:07 christos 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 #ifdef PPP_FILTER 143 #include <net/bpf.h> 144 #endif 145 146 #include <netinet/in.h> 147 #include <netinet/in_systm.h> 148 #include <netinet/in_var.h> 149 #ifdef INET 150 #include <netinet/ip.h> 151 #endif 152 153 #include <net/bpf.h> 154 155 #include <net/slip.h> 156 157 #ifdef VJC 158 #include <net/slcompress.h> 159 #endif 160 161 #include <net/ppp_defs.h> 162 #include <net/if_ppp.h> 163 #include <net/if_pppvar.h> 164 #include <sys/cpu.h> 165 166 #ifdef PPP_COMPRESS 167 #define PACKETPTR struct mbuf * 168 #include <net/ppp-comp.h> 169 #endif 170 171 #include "ioconf.h" 172 173 static int pppsioctl(struct ifnet *, u_long, void *); 174 static void ppp_requeue(struct ppp_softc *); 175 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 176 static void ppp_ccp_closed(struct ppp_softc *); 177 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 178 static void pppdumpm(struct mbuf *m0); 179 #ifdef ALTQ 180 static void ppp_ifstart(struct ifnet *ifp); 181 #endif 182 183 static void pppintr(void *); 184 185 extern struct linesw ppp_disc; 186 187 /* 188 * Some useful mbuf macros not in mbuf.h. 189 */ 190 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 191 192 #define M_DATASTART(m) \ 193 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 194 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 195 196 #define M_DATASIZE(m) \ 197 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 198 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 199 200 /* 201 * We define two link layer specific mbuf flags, to mark high-priority 202 * packets for output, and received packets following lost/corrupted 203 * packets. 204 */ 205 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 206 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 207 208 static int ppp_clone_create(struct if_clone *, int); 209 static int ppp_clone_destroy(struct ifnet *); 210 211 static struct ppp_softc *ppp_create(const char *, int); 212 213 static LIST_HEAD(, ppp_softc) ppp_softc_list; 214 static kmutex_t ppp_list_lock; 215 216 struct if_clone ppp_cloner = 217 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 218 219 #ifdef PPP_COMPRESS 220 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 221 static kmutex_t ppp_compressors_mtx; 222 223 static int ppp_compressor_init(void); 224 static int ppp_compressor_destroy(void); 225 static struct compressor *ppp_get_compressor(uint8_t); 226 static void ppp_compressor_rele(struct compressor *); 227 #endif /* PPP_COMPRESS */ 228 229 230 /* 231 * Called from boot code to establish ppp interfaces. 232 */ 233 void 234 pppattach(int n __unused) 235 { 236 237 /* 238 * Nothing to do here, initialization is handled by the 239 * module initialization code in pppinit() below). 240 */ 241 } 242 243 static void 244 pppinit(void) 245 { 246 /* Init the compressor sub-sub-system */ 247 ppp_compressor_init(); 248 249 if (ttyldisc_attach(&ppp_disc) != 0) 250 panic("%s", __func__); 251 252 mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); 253 LIST_INIT(&ppp_softc_list); 254 if_clone_attach(&ppp_cloner); 255 } 256 257 static int 258 pppdetach(void) 259 { 260 int error = 0; 261 262 if (!LIST_EMPTY(&ppp_softc_list)) 263 error = EBUSY; 264 265 if (error == 0) 266 error = ttyldisc_detach(&ppp_disc); 267 268 if (error == 0) { 269 mutex_destroy(&ppp_list_lock); 270 if_clone_detach(&ppp_cloner); 271 ppp_compressor_destroy(); 272 } 273 274 return error; 275 } 276 277 static struct ppp_softc * 278 ppp_create(const char *name, int unit) 279 { 280 struct ppp_softc *sc, *sci, *scl = NULL; 281 282 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 283 284 mutex_enter(&ppp_list_lock); 285 if (unit == -1) { 286 int i = 0; 287 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 288 scl = sci; 289 if (i < sci->sc_unit) { 290 unit = i; 291 break; 292 } else { 293 #ifdef DIAGNOSTIC 294 KASSERT(i == sci->sc_unit); 295 #endif 296 i++; 297 } 298 } 299 if (unit == -1) 300 unit = i; 301 } else { 302 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 303 scl = sci; 304 if (unit < sci->sc_unit) 305 break; 306 else if (unit == sci->sc_unit) { 307 free(sc, M_DEVBUF); 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_softc_list, sc, sc_iflist); 319 320 mutex_exit(&ppp_list_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_list_lock); 363 LIST_REMOVE(sc, sc_iflist); 364 mutex_exit(&ppp_list_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_list_lock); 383 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 384 if (scf->sc_xfer == pid) { 385 scf->sc_xfer = 0; 386 mutex_exit(&ppp_list_lock); 387 return scf; 388 } 389 if (scf->sc_devp == NULL && sc == NULL) 390 sc = scf; 391 } 392 mutex_exit(&ppp_list_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 error = EAFNOSUPPORT; 805 break; 806 } 807 ifa->ifa_rtrequest = p2p_rtrequest; 808 break; 809 810 case SIOCADDMULTI: 811 case SIOCDELMULTI: 812 if (ifr == NULL) { 813 error = EAFNOSUPPORT; 814 break; 815 } 816 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 817 #ifdef INET 818 case AF_INET: 819 break; 820 #endif 821 #ifdef INET6 822 case AF_INET6: 823 break; 824 #endif 825 default: 826 error = EAFNOSUPPORT; 827 break; 828 } 829 break; 830 831 case SIOCGPPPSTATS: 832 psp = &((struct ifpppstatsreq *) data)->stats; 833 memset(psp, 0, sizeof(*psp)); 834 psp->p = sc->sc_stats; 835 #if defined(VJC) && !defined(SL_NO_STATS) 836 if (sc->sc_comp) { 837 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 838 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 839 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 840 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 841 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 842 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 843 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 844 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 845 } 846 #endif /* VJC */ 847 break; 848 849 #ifdef PPP_COMPRESS 850 case SIOCGPPPCSTATS: 851 pcp = &((struct ifpppcstatsreq *) data)->stats; 852 memset(pcp, 0, sizeof(*pcp)); 853 if (sc->sc_xc_state != NULL) 854 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 855 if (sc->sc_rc_state != NULL) 856 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 857 break; 858 #endif /* PPP_COMPRESS */ 859 860 default: 861 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 862 error = 0; 863 break; 864 } 865 splx(s); 866 return (error); 867 } 868 869 /* 870 * Queue a packet. Start transmission if not active. 871 * Packet is placed in Information field of PPP frame. 872 */ 873 int 874 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 875 const struct rtentry *rtp) 876 { 877 struct ppp_softc *sc = ifp->if_softc; 878 int protocol, address, control; 879 u_char *cp; 880 int s, error; 881 #ifdef INET 882 struct ip *ip; 883 #endif 884 struct ifqueue *ifq; 885 enum NPmode mode; 886 int len; 887 888 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 889 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 890 error = ENETDOWN; /* sort of */ 891 goto bad; 892 } 893 894 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 895 896 /* 897 * Compute PPP header. 898 */ 899 m0->m_flags &= ~M_HIGHPRI; 900 switch (dst->sa_family) { 901 #ifdef INET 902 case AF_INET: 903 address = PPP_ALLSTATIONS; 904 control = PPP_UI; 905 protocol = PPP_IP; 906 mode = sc->sc_npmode[NP_IP]; 907 908 /* 909 * If this packet has the "low delay" bit set in the IP header, 910 * put it on the fastq instead. 911 */ 912 ip = mtod(m0, struct ip *); 913 if (ip->ip_tos & IPTOS_LOWDELAY) 914 m0->m_flags |= M_HIGHPRI; 915 break; 916 #endif 917 #ifdef INET6 918 case AF_INET6: 919 address = PPP_ALLSTATIONS; /*XXX*/ 920 control = PPP_UI; /*XXX*/ 921 protocol = PPP_IPV6; 922 mode = sc->sc_npmode[NP_IPV6]; 923 924 #if 0 /* XXX flowinfo/traffic class, maybe? */ 925 /* 926 * If this packet has the "low delay" bit set in the IP header, 927 * put it on the fastq instead. 928 */ 929 ip = mtod(m0, struct ip *); 930 if (ip->ip_tos & IPTOS_LOWDELAY) 931 m0->m_flags |= M_HIGHPRI; 932 #endif 933 break; 934 #endif 935 case AF_UNSPEC: 936 address = PPP_ADDRESS(dst->sa_data); 937 control = PPP_CONTROL(dst->sa_data); 938 protocol = PPP_PROTOCOL(dst->sa_data); 939 mode = NPMODE_PASS; 940 break; 941 default: 942 printf("%s: af%d not supported\n", ifp->if_xname, 943 dst->sa_family); 944 error = EAFNOSUPPORT; 945 goto bad; 946 } 947 948 /* 949 * Drop this packet, or return an error, if necessary. 950 */ 951 if (mode == NPMODE_ERROR) { 952 error = ENETDOWN; 953 goto bad; 954 } 955 if (mode == NPMODE_DROP) { 956 error = 0; 957 goto bad; 958 } 959 960 /* 961 * Add PPP header. 962 */ 963 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 964 if (m0 == NULL) { 965 error = ENOBUFS; 966 goto bad; 967 } 968 969 cp = mtod(m0, u_char *); 970 *cp++ = address; 971 *cp++ = control; 972 *cp++ = protocol >> 8; 973 *cp++ = protocol & 0xff; 974 975 len = m_length(m0); 976 977 if (sc->sc_flags & SC_LOG_OUTPKT) { 978 printf("%s output: ", ifp->if_xname); 979 pppdumpm(m0); 980 } 981 982 if ((protocol & 0x8000) == 0) { 983 #ifdef PPP_FILTER 984 /* 985 * Apply the pass and active filters to the packet, 986 * but only if it is a data packet. 987 */ 988 if (sc->sc_pass_filt_out.bf_insns != 0 989 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 990 (u_char *)m0, len, 0) == 0) { 991 error = 0; /* drop this packet */ 992 goto bad; 993 } 994 995 /* 996 * Update the time we sent the most recent packet. 997 */ 998 if (sc->sc_active_filt_out.bf_insns == 0 999 || bpf_filter(sc->sc_active_filt_out.bf_insns, 1000 (u_char *)m0, len, 0)) 1001 sc->sc_last_sent = time_second; 1002 #else 1003 /* 1004 * Update the time we sent the most recent packet. 1005 */ 1006 sc->sc_last_sent = time_second; 1007 #endif /* PPP_FILTER */ 1008 } 1009 1010 /* 1011 * See if bpf wants to look at the packet. 1012 */ 1013 bpf_mtap(&sc->sc_if, m0); 1014 1015 /* 1016 * Put the packet on the appropriate queue. 1017 */ 1018 s = splnet(); 1019 if (mode == NPMODE_QUEUE) { 1020 /* XXX we should limit the number of packets on this queue */ 1021 *sc->sc_npqtail = m0; 1022 m0->m_nextpkt = NULL; 1023 sc->sc_npqtail = &m0->m_nextpkt; 1024 } else { 1025 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1026 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1027 splx(s); 1028 sc->sc_if.if_oerrors++; 1029 sc->sc_stats.ppp_oerrors++; 1030 return (error); 1031 } 1032 ppp_restart(sc); 1033 } 1034 ifp->if_opackets++; 1035 ifp->if_obytes += len; 1036 1037 splx(s); 1038 return (0); 1039 1040 bad: 1041 m_freem(m0); 1042 return (error); 1043 } 1044 1045 /* 1046 * After a change in the NPmode for some NP, move packets from the 1047 * npqueue to the send queue or the fast queue as appropriate. 1048 * Should be called at splnet, since we muck with the queues. 1049 */ 1050 static void 1051 ppp_requeue(struct ppp_softc *sc) 1052 { 1053 struct mbuf *m, **mpp; 1054 struct ifqueue *ifq; 1055 enum NPmode mode; 1056 int error; 1057 1058 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1059 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1060 case PPP_IP: 1061 mode = sc->sc_npmode[NP_IP]; 1062 break; 1063 case PPP_IPV6: 1064 mode = sc->sc_npmode[NP_IPV6]; 1065 break; 1066 default: 1067 mode = NPMODE_PASS; 1068 } 1069 1070 switch (mode) { 1071 case NPMODE_PASS: 1072 /* 1073 * This packet can now go on one of the queues to 1074 * be sent. 1075 */ 1076 *mpp = m->m_nextpkt; 1077 m->m_nextpkt = NULL; 1078 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1079 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1080 sc->sc_if.if_oerrors++; 1081 sc->sc_stats.ppp_oerrors++; 1082 } 1083 break; 1084 1085 case NPMODE_DROP: 1086 case NPMODE_ERROR: 1087 *mpp = m->m_nextpkt; 1088 m_freem(m); 1089 break; 1090 1091 case NPMODE_QUEUE: 1092 mpp = &m->m_nextpkt; 1093 break; 1094 } 1095 } 1096 sc->sc_npqtail = mpp; 1097 } 1098 1099 /* 1100 * Transmitter has finished outputting some stuff; 1101 * remember to call sc->sc_start later at splsoftnet. 1102 */ 1103 void 1104 ppp_restart(struct ppp_softc *sc) 1105 { 1106 int s = splhigh(); /* XXX IMP ME HARDER */ 1107 1108 sc->sc_flags &= ~SC_TBUSY; 1109 softint_schedule(sc->sc_si); 1110 splx(s); 1111 } 1112 1113 /* 1114 * Get a packet to send. This procedure is intended to be called at 1115 * splsoftnet, since it may involve time-consuming operations such as 1116 * applying VJ compression, packet compression, address/control and/or 1117 * protocol field compression to the packet. 1118 */ 1119 struct mbuf * 1120 ppp_dequeue(struct ppp_softc *sc) 1121 { 1122 struct mbuf *m, *mp; 1123 u_char *cp; 1124 int address, control, protocol; 1125 int s; 1126 1127 /* 1128 * Grab a packet to send: first try the fast queue, then the 1129 * normal queue. 1130 */ 1131 s = splnet(); 1132 if (sc->sc_nfastq < sc->sc_maxfastq) { 1133 IF_DEQUEUE(&sc->sc_fastq, m); 1134 if (m != NULL) 1135 sc->sc_nfastq++; 1136 else 1137 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1138 } else { 1139 sc->sc_nfastq = 0; 1140 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1141 if (m == NULL) { 1142 IF_DEQUEUE(&sc->sc_fastq, m); 1143 if (m != NULL) 1144 sc->sc_nfastq++; 1145 } 1146 } 1147 splx(s); 1148 1149 if (m == NULL) 1150 return NULL; 1151 1152 ++sc->sc_stats.ppp_opackets; 1153 1154 /* 1155 * Extract the ppp header of the new packet. 1156 * The ppp header will be in one mbuf. 1157 */ 1158 cp = mtod(m, u_char *); 1159 address = PPP_ADDRESS(cp); 1160 control = PPP_CONTROL(cp); 1161 protocol = PPP_PROTOCOL(cp); 1162 1163 switch (protocol) { 1164 case PPP_IP: 1165 #ifdef VJC 1166 /* 1167 * If the packet is a TCP/IP packet, see if we can compress it. 1168 */ 1169 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1170 struct ip *ip; 1171 int type; 1172 1173 mp = m; 1174 ip = (struct ip *) (cp + PPP_HDRLEN); 1175 if (mp->m_len <= PPP_HDRLEN) { 1176 mp = mp->m_next; 1177 if (mp == NULL) 1178 break; 1179 ip = mtod(mp, struct ip *); 1180 } 1181 /* 1182 * This code assumes the IP/TCP header is in one 1183 * non-shared mbuf 1184 */ 1185 if (ip->ip_p == IPPROTO_TCP) { 1186 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1187 !(sc->sc_flags & SC_NO_TCP_CCID)); 1188 switch (type) { 1189 case TYPE_UNCOMPRESSED_TCP: 1190 protocol = PPP_VJC_UNCOMP; 1191 break; 1192 case TYPE_COMPRESSED_TCP: 1193 protocol = PPP_VJC_COMP; 1194 cp = mtod(m, u_char *); 1195 cp[0] = address; /* Header has moved */ 1196 cp[1] = control; 1197 cp[2] = 0; 1198 break; 1199 } 1200 /* Update protocol in PPP header */ 1201 cp[3] = protocol; 1202 } 1203 } 1204 #endif /* VJC */ 1205 break; 1206 1207 #ifdef PPP_COMPRESS 1208 case PPP_CCP: 1209 ppp_ccp(sc, m, 0); 1210 break; 1211 #endif /* PPP_COMPRESS */ 1212 } 1213 1214 #ifdef PPP_COMPRESS 1215 if (protocol != PPP_LCP && protocol != PPP_CCP 1216 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1217 struct mbuf *mcomp = NULL; 1218 int slen; 1219 1220 slen = 0; 1221 for (mp = m; mp != NULL; mp = mp->m_next) 1222 slen += mp->m_len; 1223 (*sc->sc_xcomp->compress) 1224 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1225 if (mcomp != NULL) { 1226 if (sc->sc_flags & SC_CCP_UP) { 1227 /* 1228 * Send the compressed packet instead of the 1229 * original. 1230 */ 1231 m_freem(m); 1232 m = mcomp; 1233 cp = mtod(m, u_char *); 1234 protocol = cp[3]; 1235 } else { 1236 /* 1237 * Can't transmit compressed packets until CCP 1238 * is up. 1239 */ 1240 m_freem(mcomp); 1241 } 1242 } 1243 } 1244 #endif /* PPP_COMPRESS */ 1245 1246 /* 1247 * Compress the address/control and protocol, if possible. 1248 */ 1249 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1250 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1251 protocol != PPP_LCP) { 1252 /* can compress address/control */ 1253 m->m_data += 2; 1254 m->m_len -= 2; 1255 } 1256 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1257 /* can compress protocol */ 1258 if (mtod(m, u_char *) == cp) { 1259 cp[2] = cp[1]; /* move address/control up */ 1260 cp[1] = cp[0]; 1261 } 1262 ++m->m_data; 1263 --m->m_len; 1264 } 1265 1266 return m; 1267 } 1268 1269 /* 1270 * Software interrupt routine, called at splsoftnet. 1271 */ 1272 static void 1273 pppintr(void *arg) 1274 { 1275 struct ppp_softc *sc = arg; 1276 struct mbuf *m; 1277 int s; 1278 1279 mutex_enter(softnet_lock); 1280 if (!(sc->sc_flags & SC_TBUSY) 1281 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1282 || sc->sc_outm)) { 1283 s = splhigh(); /* XXX IMP ME HARDER */ 1284 sc->sc_flags |= SC_TBUSY; 1285 splx(s); 1286 (*sc->sc_start)(sc); 1287 } 1288 for (;;) { 1289 s = splnet(); 1290 IF_DEQUEUE(&sc->sc_rawq, m); 1291 splx(s); 1292 if (m == NULL) 1293 break; 1294 ppp_inproc(sc, m); 1295 } 1296 mutex_exit(softnet_lock); 1297 } 1298 1299 #ifdef PPP_COMPRESS 1300 /* 1301 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1302 * 0 if it is about to be transmitted. 1303 */ 1304 static void 1305 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1306 { 1307 u_char *dp, *ep; 1308 struct mbuf *mp; 1309 int slen, s; 1310 1311 /* 1312 * Get a pointer to the data after the PPP header. 1313 */ 1314 if (m->m_len <= PPP_HDRLEN) { 1315 mp = m->m_next; 1316 if (mp == NULL) 1317 return; 1318 dp = mtod(mp, u_char *); 1319 } else { 1320 mp = m; 1321 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1322 } 1323 1324 ep = mtod(mp, u_char *) + mp->m_len; 1325 if (dp + CCP_HDRLEN > ep) 1326 return; 1327 slen = CCP_LENGTH(dp); 1328 if (dp + slen > ep) { 1329 if (sc->sc_flags & SC_DEBUG) 1330 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1331 dp, slen, mtod(mp, u_char *), mp->m_len); 1332 return; 1333 } 1334 1335 switch (CCP_CODE(dp)) { 1336 case CCP_CONFREQ: 1337 case CCP_TERMREQ: 1338 case CCP_TERMACK: 1339 /* CCP must be going down - disable compression */ 1340 if (sc->sc_flags & SC_CCP_UP) { 1341 s = splhigh(); /* XXX IMP ME HARDER */ 1342 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1343 splx(s); 1344 } 1345 break; 1346 1347 case CCP_CONFACK: 1348 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1349 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1350 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1351 if (!rcvd) { 1352 /* We're agreeing to send compressed packets. */ 1353 if (sc->sc_xc_state != NULL 1354 && (*sc->sc_xcomp->comp_init) 1355 (sc->sc_xc_state, dp + CCP_HDRLEN, 1356 slen - CCP_HDRLEN, sc->sc_unit, 0, 1357 sc->sc_flags & SC_DEBUG)) { 1358 s = splhigh(); /* XXX IMP ME HARDER */ 1359 sc->sc_flags |= SC_COMP_RUN; 1360 splx(s); 1361 } 1362 } else { 1363 /* 1364 * Peer is agreeing to send compressed 1365 * packets. 1366 */ 1367 if (sc->sc_rc_state != NULL 1368 && (*sc->sc_rcomp->decomp_init) 1369 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1370 sc->sc_unit, 0, sc->sc_mru, 1371 sc->sc_flags & SC_DEBUG)) { 1372 s = splhigh(); /* XXX IMP ME HARDER */ 1373 sc->sc_flags |= SC_DECOMP_RUN; 1374 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1375 splx(s); 1376 } 1377 } 1378 } 1379 break; 1380 1381 case CCP_RESETACK: 1382 if (sc->sc_flags & SC_CCP_UP) { 1383 if (!rcvd) { 1384 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1385 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1386 } else { 1387 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1388 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1389 s = splhigh(); /* XXX IMP ME HARDER */ 1390 sc->sc_flags &= ~SC_DC_ERROR; 1391 splx(s); 1392 } 1393 } 1394 } 1395 break; 1396 } 1397 } 1398 1399 /* 1400 * CCP is down; free (de)compressor state if necessary. 1401 */ 1402 static void 1403 ppp_ccp_closed(struct ppp_softc *sc) 1404 { 1405 if (sc->sc_xc_state) { 1406 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1407 ppp_compressor_rele(sc->sc_xcomp); 1408 sc->sc_xc_state = NULL; 1409 } 1410 if (sc->sc_rc_state) { 1411 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1412 ppp_compressor_rele(sc->sc_rcomp); 1413 sc->sc_rc_state = NULL; 1414 } 1415 } 1416 #endif /* PPP_COMPRESS */ 1417 1418 /* 1419 * PPP packet input routine. 1420 * The caller has checked and removed the FCS and has inserted 1421 * the address/control bytes and the protocol high byte if they 1422 * were omitted. 1423 */ 1424 void 1425 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1426 { 1427 int s = splhigh(); /* XXX IMP ME HARDER */ 1428 1429 if (lost) 1430 m->m_flags |= M_ERRMARK; 1431 IF_ENQUEUE(&sc->sc_rawq, m); 1432 softint_schedule(sc->sc_si); 1433 splx(s); 1434 } 1435 1436 /* 1437 * Process a received PPP packet, doing decompression as necessary. 1438 * Should be called at splsoftnet. 1439 */ 1440 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1441 TYPE_UNCOMPRESSED_TCP) 1442 1443 static void 1444 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1445 { 1446 struct ifnet *ifp = &sc->sc_if; 1447 pktqueue_t *pktq = NULL; 1448 struct ifqueue *inq = NULL; 1449 int s, ilen, proto, rv; 1450 u_char *cp, adrs, ctrl; 1451 struct mbuf *mp, *dmp = NULL; 1452 #ifdef VJC 1453 int xlen; 1454 u_char *iphdr; 1455 u_int hlen; 1456 #endif 1457 1458 sc->sc_stats.ppp_ipackets++; 1459 1460 if (sc->sc_flags & SC_LOG_INPKT) { 1461 ilen = 0; 1462 for (mp = m; mp != NULL; mp = mp->m_next) 1463 ilen += mp->m_len; 1464 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1465 pppdumpm(m); 1466 } 1467 1468 cp = mtod(m, u_char *); 1469 adrs = PPP_ADDRESS(cp); 1470 ctrl = PPP_CONTROL(cp); 1471 proto = PPP_PROTOCOL(cp); 1472 1473 if (m->m_flags & M_ERRMARK) { 1474 m->m_flags &= ~M_ERRMARK; 1475 s = splhigh(); /* XXX IMP ME HARDER */ 1476 sc->sc_flags |= SC_VJ_RESET; 1477 splx(s); 1478 } 1479 1480 #ifdef PPP_COMPRESS 1481 /* 1482 * Decompress this packet if necessary, update the receiver's 1483 * dictionary, or take appropriate action on a CCP packet. 1484 */ 1485 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1486 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1487 /* Decompress this packet */ 1488 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1489 if (rv == DECOMP_OK) { 1490 m_freem(m); 1491 if (dmp == NULL) { 1492 /* 1493 * No error, but no decompressed packet 1494 * produced 1495 */ 1496 return; 1497 } 1498 m = dmp; 1499 cp = mtod(m, u_char *); 1500 proto = PPP_PROTOCOL(cp); 1501 1502 } else { 1503 /* 1504 * An error has occurred in decompression. 1505 * Pass the compressed packet up to pppd, which may 1506 * take CCP down or issue a Reset-Req. 1507 */ 1508 if (sc->sc_flags & SC_DEBUG) 1509 printf("%s: decompress failed %d\n", 1510 ifp->if_xname, rv); 1511 s = splhigh(); /* XXX IMP ME HARDER */ 1512 sc->sc_flags |= SC_VJ_RESET; 1513 if (rv == DECOMP_ERROR) 1514 sc->sc_flags |= SC_DC_ERROR; 1515 else 1516 sc->sc_flags |= SC_DC_FERROR; 1517 splx(s); 1518 } 1519 1520 } else { 1521 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1522 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1523 if (proto == PPP_CCP) 1524 ppp_ccp(sc, m, 1); 1525 } 1526 #endif 1527 1528 ilen = 0; 1529 for (mp = m; mp != NULL; mp = mp->m_next) 1530 ilen += mp->m_len; 1531 1532 #ifdef VJC 1533 if (sc->sc_flags & SC_VJ_RESET) { 1534 /* 1535 * If we've missed a packet, we must toss subsequent compressed 1536 * packets which don't have an explicit connection ID. 1537 */ 1538 if (sc->sc_comp) 1539 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1540 s = splhigh(); /* XXX IMP ME HARDER */ 1541 sc->sc_flags &= ~SC_VJ_RESET; 1542 splx(s); 1543 } 1544 1545 /* 1546 * See if we have a VJ-compressed packet to uncompress. 1547 */ 1548 if (proto == PPP_VJC_COMP) { 1549 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1550 goto bad; 1551 1552 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1553 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1554 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1555 1556 if (xlen <= 0) { 1557 if (sc->sc_flags & SC_DEBUG) 1558 printf("%s: VJ uncompress failed on type comp\n", 1559 ifp->if_xname); 1560 goto bad; 1561 } 1562 1563 /* Copy the PPP and IP headers into a new mbuf. */ 1564 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1565 if (mp == NULL) 1566 goto bad; 1567 mp->m_len = 0; 1568 mp->m_next = NULL; 1569 if (hlen + PPP_HDRLEN > MHLEN) { 1570 MCLGET(mp, M_DONTWAIT); 1571 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1572 /* Lose if big headers and no clusters */ 1573 m_freem(mp); 1574 goto bad; 1575 } 1576 } 1577 cp = mtod(mp, u_char *); 1578 cp[0] = adrs; 1579 cp[1] = ctrl; 1580 cp[2] = 0; 1581 cp[3] = PPP_IP; 1582 proto = PPP_IP; 1583 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1584 mp->m_len = hlen + PPP_HDRLEN; 1585 1586 /* 1587 * Trim the PPP and VJ headers off the old mbuf 1588 * and stick the new and old mbufs together. 1589 */ 1590 m->m_data += PPP_HDRLEN + xlen; 1591 m->m_len -= PPP_HDRLEN + xlen; 1592 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1593 bcopy(mtod(m, u_char *), 1594 mtod(mp, u_char *) + mp->m_len, m->m_len); 1595 mp->m_len += m->m_len; 1596 mp->m_next = m_free(m); 1597 } else 1598 mp->m_next = m; 1599 m = mp; 1600 ilen += hlen - xlen; 1601 1602 } else if (proto == PPP_VJC_UNCOMP) { 1603 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1604 goto bad; 1605 1606 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1607 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1608 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1609 1610 if (xlen < 0) { 1611 if (sc->sc_flags & SC_DEBUG) 1612 printf("%s: VJ uncompress failed on type uncomp\n", 1613 ifp->if_xname); 1614 goto bad; 1615 } 1616 1617 proto = PPP_IP; 1618 cp[3] = PPP_IP; 1619 } 1620 #endif /* VJC */ 1621 1622 /* 1623 * If the packet will fit in a header mbuf, don't waste a 1624 * whole cluster on it. 1625 */ 1626 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1627 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1628 if (mp != NULL) { 1629 m_copydata(m, 0, ilen, mtod(mp, void *)); 1630 m_freem(m); 1631 m = mp; 1632 m->m_len = ilen; 1633 } 1634 } 1635 m->m_pkthdr.len = ilen; 1636 m_set_rcvif(m, ifp); 1637 1638 if ((proto & 0x8000) == 0) { 1639 #ifdef PPP_FILTER 1640 /* 1641 * See whether we want to pass this packet, and 1642 * if it counts as link activity. 1643 */ 1644 if (sc->sc_pass_filt_in.bf_insns != 0 1645 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1646 (u_char *)m, ilen, 0) == 0) { 1647 /* drop this packet */ 1648 m_freem(m); 1649 return; 1650 } 1651 if (sc->sc_active_filt_in.bf_insns == 0 1652 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1653 (u_char *)m, ilen, 0)) 1654 sc->sc_last_recv = time_second; 1655 #else 1656 /* 1657 * Record the time that we received this packet. 1658 */ 1659 sc->sc_last_recv = time_second; 1660 #endif /* PPP_FILTER */ 1661 } 1662 1663 /* See if bpf wants to look at the packet. */ 1664 bpf_mtap(&sc->sc_if, m); 1665 1666 switch (proto) { 1667 #ifdef INET 1668 case PPP_IP: 1669 /* 1670 * IP packet - take off the ppp header and pass it up to IP. 1671 */ 1672 if ((ifp->if_flags & IFF_UP) == 0 1673 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1674 /* Interface is down - drop the packet. */ 1675 m_freem(m); 1676 return; 1677 } 1678 m->m_pkthdr.len -= PPP_HDRLEN; 1679 m->m_data += PPP_HDRLEN; 1680 m->m_len -= PPP_HDRLEN; 1681 #ifdef GATEWAY 1682 if (ipflow_fastforward(m)) 1683 return; 1684 #endif 1685 pktq = ip_pktq; 1686 break; 1687 #endif 1688 1689 #ifdef INET6 1690 case PPP_IPV6: 1691 /* 1692 * IPv6 packet - take off the ppp header and pass it up to 1693 * IPv6. 1694 */ 1695 if ((ifp->if_flags & IFF_UP) == 0 1696 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1697 /* interface is down - drop the packet. */ 1698 m_freem(m); 1699 return; 1700 } 1701 m->m_pkthdr.len -= PPP_HDRLEN; 1702 m->m_data += PPP_HDRLEN; 1703 m->m_len -= PPP_HDRLEN; 1704 #ifdef GATEWAY 1705 if (ip6flow_fastforward(&m)) 1706 return; 1707 #endif 1708 pktq = ip6_pktq; 1709 break; 1710 #endif 1711 1712 default: 1713 /* 1714 * Some other protocol - place on input queue for read(). 1715 */ 1716 inq = &sc->sc_inq; 1717 pktq = NULL; 1718 break; 1719 } 1720 1721 /* 1722 * Put the packet on the appropriate input queue. 1723 */ 1724 s = splnet(); 1725 1726 /* pktq: inet or inet6 cases */ 1727 if (__predict_true(pktq)) { 1728 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1729 ifp->if_iqdrops++; 1730 goto bad; 1731 } 1732 ifp->if_ipackets++; 1733 ifp->if_ibytes += ilen; 1734 splx(s); 1735 return; 1736 } 1737 1738 /* ifq: other protocol cases */ 1739 if (!inq) { 1740 goto bad; 1741 } 1742 if (IF_QFULL(inq)) { 1743 IF_DROP(inq); 1744 splx(s); 1745 if (sc->sc_flags & SC_DEBUG) 1746 printf("%s: input queue full\n", ifp->if_xname); 1747 ifp->if_iqdrops++; 1748 goto bad; 1749 } 1750 IF_ENQUEUE(inq, m); 1751 splx(s); 1752 ifp->if_ipackets++; 1753 ifp->if_ibytes += ilen; 1754 1755 (*sc->sc_ctlp)(sc); 1756 1757 return; 1758 1759 bad: 1760 m_freem(m); 1761 sc->sc_if.if_ierrors++; 1762 sc->sc_stats.ppp_ierrors++; 1763 } 1764 1765 #define MAX_DUMP_BYTES 128 1766 1767 static void 1768 pppdumpm(struct mbuf *m0) 1769 { 1770 char buf[3*MAX_DUMP_BYTES+4]; 1771 char *bp = buf; 1772 struct mbuf *m; 1773 1774 for (m = m0; m; m = m->m_next) { 1775 int l = m->m_len; 1776 u_char *rptr = (u_char *)m->m_data; 1777 1778 while (l--) { 1779 if (bp > buf + sizeof(buf) - 4) 1780 goto done; 1781 /* Convert byte to ascii hex */ 1782 *bp++ = hexdigits[*rptr >> 4]; 1783 *bp++ = hexdigits[*rptr++ & 0xf]; 1784 } 1785 1786 if (m->m_next) { 1787 if (bp > buf + sizeof(buf) - 3) 1788 goto done; 1789 *bp++ = '|'; 1790 } else 1791 *bp++ = ' '; 1792 } 1793 done: 1794 if (m) 1795 *bp++ = '>'; 1796 *bp = 0; 1797 printf("%s\n", buf); 1798 } 1799 1800 #ifdef ALTQ 1801 /* 1802 * A wrapper to transmit a packet from if_start since ALTQ uses 1803 * if_start to send a packet. 1804 */ 1805 static void 1806 ppp_ifstart(struct ifnet *ifp) 1807 { 1808 struct ppp_softc *sc; 1809 1810 sc = ifp->if_softc; 1811 (*sc->sc_start)(sc); 1812 } 1813 #endif 1814 1815 static const struct ppp_known_compressor { 1816 uint8_t code; 1817 const char *module; 1818 } ppp_known_compressors[] = { 1819 { CI_DEFLATE, "ppp_deflate" }, 1820 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1821 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1822 { CI_MPPE, "ppp_mppe" }, 1823 { 0, NULL } 1824 }; 1825 1826 static int 1827 ppp_compressor_init(void) 1828 { 1829 1830 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1831 return 0; 1832 } 1833 1834 static int 1835 ppp_compressor_destroy(void) 1836 { 1837 1838 mutex_destroy(&ppp_compressors_mtx); 1839 return 0; 1840 } 1841 1842 static void 1843 ppp_compressor_rele(struct compressor *cp) 1844 { 1845 1846 mutex_enter(&ppp_compressors_mtx); 1847 --cp->comp_refcnt; 1848 mutex_exit(&ppp_compressors_mtx); 1849 } 1850 1851 static struct compressor * 1852 ppp_get_compressor_noload(uint8_t ci, bool hold) 1853 { 1854 struct compressor *cp; 1855 1856 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1857 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1858 if (cp->compress_proto == ci) { 1859 if (hold) 1860 ++cp->comp_refcnt; 1861 return cp; 1862 } 1863 } 1864 1865 return NULL; 1866 } 1867 1868 static struct compressor * 1869 ppp_get_compressor(uint8_t ci) 1870 { 1871 struct compressor *cp = NULL; 1872 const struct ppp_known_compressor *pkc; 1873 1874 mutex_enter(&ppp_compressors_mtx); 1875 cp = ppp_get_compressor_noload(ci, true); 1876 mutex_exit(&ppp_compressors_mtx); 1877 if (cp != NULL) 1878 return cp; 1879 1880 kernconfig_lock(); 1881 mutex_enter(&ppp_compressors_mtx); 1882 cp = ppp_get_compressor_noload(ci, true); 1883 mutex_exit(&ppp_compressors_mtx); 1884 if (cp == NULL) { 1885 /* Not found, so try to autoload a module */ 1886 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1887 if (pkc->code == ci) { 1888 if (module_autoload(pkc->module, 1889 MODULE_CLASS_MISC) != 0) 1890 break; 1891 mutex_enter(&ppp_compressors_mtx); 1892 cp = ppp_get_compressor_noload(ci, true); 1893 mutex_exit(&ppp_compressors_mtx); 1894 break; 1895 } 1896 } 1897 } 1898 kernconfig_unlock(); 1899 1900 return cp; 1901 } 1902 1903 int 1904 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1905 { 1906 int error = 0; 1907 size_t i; 1908 1909 mutex_enter(&ppp_compressors_mtx); 1910 for (i = 0; i < ncomp; i++) { 1911 if (ppp_get_compressor_noload(pc[i].compress_proto, 1912 false) != NULL) 1913 error = EEXIST; 1914 } 1915 if (!error) { 1916 for (i = 0; i < ncomp; i++) { 1917 pc[i].comp_refcnt = 0; 1918 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1919 } 1920 } 1921 mutex_exit(&ppp_compressors_mtx); 1922 1923 return error; 1924 } 1925 1926 int 1927 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1928 { 1929 int error = 0; 1930 size_t i; 1931 1932 mutex_enter(&ppp_compressors_mtx); 1933 for (i = 0; i < ncomp; i++) { 1934 if (ppp_get_compressor_noload(pc[i].compress_proto, 1935 false) != &pc[i]) 1936 error = ENOENT; 1937 else if (pc[i].comp_refcnt != 0) 1938 error = EBUSY; 1939 } 1940 if (!error) { 1941 for (i = 0; i < ncomp; i++) { 1942 LIST_REMOVE(&pc[i], comp_list); 1943 } 1944 } 1945 mutex_exit(&ppp_compressors_mtx); 1946 1947 return error; 1948 } 1949 1950 /* 1951 * Module infrastructure 1952 */ 1953 #include "if_module.h" 1954 1955 #ifdef PPP_FILTER 1956 #define PPP_DEP "bpf_filter," 1957 #else 1958 #define PPP_DEP 1959 #endif 1960 1961 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1962
Indexes created Tue Sep 23 21:09:50 GMT 2025