if_ppp.c revision 1.158.8.1
1 /* $NetBSD: if_ppp.c,v 1.158.8.1 2018/07/26 23:55:31 snj 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 1.158.8.1 2018/07/26 23:55:31 snj Exp $"); 106 107 #ifdef _KERNEL_OPT 108 #include "ppp.h" 109 #include "opt_inet.h" 110 #include "opt_gateway.h" 111 #include "opt_ppp.h" 112 #endif 113 114 #ifdef INET 115 #define VJC 116 #endif 117 #define PPP_COMPRESS 118 119 #include <sys/param.h> 120 #include <sys/proc.h> 121 #include <sys/mbuf.h> 122 #include <sys/socket.h> 123 #include <sys/ioctl.h> 124 #include <sys/kernel.h> 125 #include <sys/systm.h> 126 #include <sys/time.h> 127 #include <sys/malloc.h> 128 #include <sys/module.h> 129 #include <sys/mutex.h> 130 #include <sys/once.h> 131 #include <sys/conf.h> 132 #include <sys/kauth.h> 133 #include <sys/intr.h> 134 #include <sys/socketvar.h> 135 #include <sys/device.h> 136 #include <sys/module.h> 137 138 #include <net/if.h> 139 #include <net/if_types.h> 140 #include <net/netisr.h> 141 #include <net/route.h> 142 143 #include <netinet/in.h> 144 #include <netinet/in_systm.h> 145 #include <netinet/in_var.h> 146 #ifdef INET 147 #include <netinet/ip.h> 148 #endif 149 150 #include <net/bpf.h> 151 #include <net/slip.h> 152 153 #ifdef VJC 154 #include <net/slcompress.h> 155 #endif 156 157 #include <net/ppp_defs.h> 158 #include <net/if_ppp.h> 159 #include <net/if_pppvar.h> 160 #include <sys/cpu.h> 161 162 #ifdef PPP_COMPRESS 163 #define PACKETPTR struct mbuf * 164 #include <net/ppp-comp.h> 165 #endif 166 167 #include "ioconf.h" 168 169 static int pppsioctl(struct ifnet *, u_long, void *); 170 static void ppp_requeue(struct ppp_softc *); 171 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 172 static void ppp_ccp_closed(struct ppp_softc *); 173 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 174 static void pppdumpm(struct mbuf *m0); 175 #ifdef ALTQ 176 static void ppp_ifstart(struct ifnet *ifp); 177 #endif 178 179 static void pppintr(void *); 180 181 extern struct linesw ppp_disc; 182 183 /* 184 * Some useful mbuf macros not in mbuf.h. 185 */ 186 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 187 188 #define M_DATASTART(m) \ 189 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 190 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 191 192 #define M_DATASIZE(m) \ 193 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 194 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 195 196 /* 197 * We define two link layer specific mbuf flags, to mark high-priority 198 * packets for output, and received packets following lost/corrupted 199 * packets. 200 */ 201 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 202 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 203 204 static int ppp_clone_create(struct if_clone *, int); 205 static int ppp_clone_destroy(struct ifnet *); 206 207 static struct ppp_softc *ppp_create(const char *, int); 208 209 static LIST_HEAD(, ppp_softc) ppp_softc_list; 210 static kmutex_t ppp_list_lock; 211 212 struct if_clone ppp_cloner = 213 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 214 215 #ifdef PPP_COMPRESS 216 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 217 static kmutex_t ppp_compressors_mtx; 218 219 static int ppp_compressor_init(void); 220 static int ppp_compressor_destroy(void); 221 static struct compressor *ppp_get_compressor(uint8_t); 222 static void ppp_compressor_rele(struct compressor *); 223 #endif /* PPP_COMPRESS */ 224 225 226 /* 227 * Called from boot code to establish ppp interfaces. 228 */ 229 void 230 pppattach(int n __unused) 231 { 232 233 /* 234 * Nothing to do here, initialization is handled by the 235 * module initialization code in pppinit() below). 236 */ 237 } 238 239 static void 240 pppinit(void) 241 { 242 /* Init the compressor sub-sub-system */ 243 ppp_compressor_init(); 244 245 if (ttyldisc_attach(&ppp_disc) != 0) 246 panic("%s", __func__); 247 248 mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); 249 LIST_INIT(&ppp_softc_list); 250 if_clone_attach(&ppp_cloner); 251 } 252 253 static int 254 pppdetach(void) 255 { 256 int error = 0; 257 258 if (!LIST_EMPTY(&ppp_softc_list)) 259 error = EBUSY; 260 261 if (error == 0) 262 error = ttyldisc_detach(&ppp_disc); 263 264 if (error == 0) { 265 mutex_destroy(&ppp_list_lock); 266 if_clone_detach(&ppp_cloner); 267 ppp_compressor_destroy(); 268 } 269 270 return error; 271 } 272 273 static struct ppp_softc * 274 ppp_create(const char *name, int unit) 275 { 276 struct ppp_softc *sc, *sci, *scl = NULL; 277 278 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 279 280 mutex_enter(&ppp_list_lock); 281 if (unit == -1) { 282 int i = 0; 283 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 284 scl = sci; 285 if (i < sci->sc_unit) { 286 unit = i; 287 break; 288 } else { 289 #ifdef DIAGNOSTIC 290 KASSERT(i == sci->sc_unit); 291 #endif 292 i++; 293 } 294 } 295 if (unit == -1) 296 unit = i; 297 } else { 298 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 299 scl = sci; 300 if (unit < sci->sc_unit) 301 break; 302 else if (unit == sci->sc_unit) { 303 free(sc, M_DEVBUF); 304 return NULL; 305 } 306 } 307 } 308 309 if (sci != NULL) 310 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 311 else if (scl != NULL) 312 LIST_INSERT_AFTER(scl, sc, sc_iflist); 313 else 314 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 315 316 mutex_exit(&ppp_list_lock); 317 318 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 319 callout_init(&sc->sc_timo_ch, 0); 320 sc->sc_if.if_softc = sc; 321 sc->sc_if.if_mtu = PPP_MTU; 322 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 323 sc->sc_if.if_type = IFT_PPP; 324 sc->sc_if.if_hdrlen = PPP_HDRLEN; 325 sc->sc_if.if_dlt = DLT_NULL; 326 sc->sc_if.if_ioctl = pppsioctl; 327 sc->sc_if.if_output = pppoutput; 328 #ifdef ALTQ 329 sc->sc_if.if_start = ppp_ifstart; 330 #endif 331 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 332 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 333 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 334 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 335 /* Ratio of 1:2 packets between the regular and the fast queue */ 336 sc->sc_maxfastq = 2; 337 IFQ_SET_READY(&sc->sc_if.if_snd); 338 if_attach(&sc->sc_if); 339 if_alloc_sadl(&sc->sc_if); 340 bpf_attach(&sc->sc_if, DLT_NULL, 0); 341 return sc; 342 } 343 344 static int 345 ppp_clone_create(struct if_clone *ifc, int unit) 346 { 347 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 348 } 349 350 static int 351 ppp_clone_destroy(struct ifnet *ifp) 352 { 353 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 354 355 if (sc->sc_devp != NULL) 356 return EBUSY; /* Not removing it */ 357 358 mutex_enter(&ppp_list_lock); 359 LIST_REMOVE(sc, sc_iflist); 360 mutex_exit(&ppp_list_lock); 361 362 bpf_detach(ifp); 363 if_detach(ifp); 364 365 free(sc, M_DEVBUF); 366 return 0; 367 } 368 369 /* 370 * Allocate a ppp interface unit and initialize it. 371 */ 372 struct ppp_softc * 373 pppalloc(pid_t pid) 374 { 375 struct ppp_softc *sc = NULL, *scf; 376 int i; 377 378 mutex_enter(&ppp_list_lock); 379 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 380 if (scf->sc_xfer == pid) { 381 scf->sc_xfer = 0; 382 mutex_exit(&ppp_list_lock); 383 return scf; 384 } 385 if (scf->sc_devp == NULL && sc == NULL) 386 sc = scf; 387 } 388 mutex_exit(&ppp_list_lock); 389 390 if (sc == NULL) 391 sc = ppp_create(ppp_cloner.ifc_name, -1); 392 393 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 394 if (sc->sc_si == NULL) { 395 printf("%s: unable to establish softintr\n", 396 sc->sc_if.if_xname); 397 return (NULL); 398 } 399 sc->sc_flags = 0; 400 sc->sc_mru = PPP_MRU; 401 sc->sc_relinq = NULL; 402 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 403 #ifdef VJC 404 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 405 if (sc->sc_comp) 406 sl_compress_init(sc->sc_comp); 407 #endif 408 #ifdef PPP_COMPRESS 409 sc->sc_xc_state = NULL; 410 sc->sc_rc_state = NULL; 411 #endif /* PPP_COMPRESS */ 412 for (i = 0; i < NUM_NP; ++i) 413 sc->sc_npmode[i] = NPMODE_ERROR; 414 sc->sc_npqueue = NULL; 415 sc->sc_npqtail = &sc->sc_npqueue; 416 sc->sc_last_sent = sc->sc_last_recv = time_second; 417 418 return sc; 419 } 420 421 /* 422 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 423 */ 424 void 425 pppdealloc(struct ppp_softc *sc) 426 { 427 struct mbuf *m; 428 429 softint_disestablish(sc->sc_si); 430 if_down(&sc->sc_if); 431 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 432 sc->sc_devp = NULL; 433 sc->sc_xfer = 0; 434 for (;;) { 435 IF_DEQUEUE(&sc->sc_rawq, m); 436 if (m == NULL) 437 break; 438 m_freem(m); 439 } 440 for (;;) { 441 IF_DEQUEUE(&sc->sc_inq, m); 442 if (m == NULL) 443 break; 444 m_freem(m); 445 } 446 for (;;) { 447 IF_DEQUEUE(&sc->sc_fastq, m); 448 if (m == NULL) 449 break; 450 m_freem(m); 451 } 452 while ((m = sc->sc_npqueue) != NULL) { 453 sc->sc_npqueue = m->m_nextpkt; 454 m_freem(m); 455 } 456 if (sc->sc_togo != NULL) { 457 m_freem(sc->sc_togo); 458 sc->sc_togo = NULL; 459 } 460 #ifdef PPP_COMPRESS 461 ppp_ccp_closed(sc); 462 sc->sc_xc_state = NULL; 463 sc->sc_rc_state = NULL; 464 #endif /* PPP_COMPRESS */ 465 #ifdef PPP_FILTER 466 if (sc->sc_pass_filt_in.bf_insns != 0) { 467 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 468 sc->sc_pass_filt_in.bf_insns = 0; 469 sc->sc_pass_filt_in.bf_len = 0; 470 } 471 if (sc->sc_pass_filt_out.bf_insns != 0) { 472 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 473 sc->sc_pass_filt_out.bf_insns = 0; 474 sc->sc_pass_filt_out.bf_len = 0; 475 } 476 if (sc->sc_active_filt_in.bf_insns != 0) { 477 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 478 sc->sc_active_filt_in.bf_insns = 0; 479 sc->sc_active_filt_in.bf_len = 0; 480 } 481 if (sc->sc_active_filt_out.bf_insns != 0) { 482 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 483 sc->sc_active_filt_out.bf_insns = 0; 484 sc->sc_active_filt_out.bf_len = 0; 485 } 486 #endif /* PPP_FILTER */ 487 #ifdef VJC 488 if (sc->sc_comp != 0) { 489 free(sc->sc_comp, M_DEVBUF); 490 sc->sc_comp = 0; 491 } 492 #endif 493 (void)ppp_clone_destroy(&sc->sc_if); 494 } 495 496 /* 497 * Ioctl routine for generic ppp devices. 498 */ 499 int 500 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 501 struct lwp *l) 502 { 503 int s, error, flags, mru, npx; 504 u_int nb; 505 struct ppp_option_data *odp; 506 struct compressor *cp; 507 struct npioctl *npi; 508 time_t t; 509 #ifdef PPP_FILTER 510 struct bpf_program *bp, *nbp; 511 struct bpf_insn *newcode, *oldcode; 512 int newcodelen; 513 #endif /* PPP_FILTER */ 514 #ifdef PPP_COMPRESS 515 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 516 #endif 517 518 switch (cmd) { 519 case PPPIOCSFLAGS: 520 case PPPIOCSMRU: 521 case PPPIOCSMAXCID: 522 case PPPIOCSCOMPRESS: 523 case PPPIOCSNPMODE: 524 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 525 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 526 KAUTH_ARG(cmd), NULL) != 0) 527 return (EPERM); 528 break; 529 case PPPIOCXFERUNIT: 530 /* XXX: Why is this privileged?! */ 531 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 532 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 533 KAUTH_ARG(cmd), NULL) != 0) 534 return (EPERM); 535 break; 536 default: 537 break; 538 } 539 540 switch (cmd) { 541 case FIONREAD: 542 *(int *)data = sc->sc_inq.ifq_len; 543 break; 544 545 case PPPIOCGUNIT: 546 *(int *)data = sc->sc_unit; 547 break; 548 549 case PPPIOCGFLAGS: 550 *(u_int *)data = sc->sc_flags; 551 break; 552 553 case PPPIOCGRAWIN: 554 { 555 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 556 u_char c, q = 0; 557 558 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 559 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 560 561 for (c = 0; c < sc->sc_rawin_start;) 562 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 563 564 rwin->count = sc->sc_rawin.count; 565 } 566 break; 567 568 case PPPIOCSFLAGS: 569 flags = *(int *)data & SC_MASK; 570 s = splsoftnet(); 571 #ifdef PPP_COMPRESS 572 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 573 ppp_ccp_closed(sc); 574 #endif 575 splhigh(); /* XXX IMP ME HARDER */ 576 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 577 splx(s); 578 break; 579 580 case PPPIOCSMRU: 581 mru = *(int *)data; 582 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 583 sc->sc_mru = mru; 584 break; 585 586 case PPPIOCGMRU: 587 *(int *)data = sc->sc_mru; 588 break; 589 590 #ifdef VJC 591 case PPPIOCSMAXCID: 592 if (sc->sc_comp) { 593 s = splsoftnet(); 594 sl_compress_setup(sc->sc_comp, *(int *)data); 595 splx(s); 596 } 597 break; 598 #endif 599 600 case PPPIOCXFERUNIT: 601 sc->sc_xfer = l->l_proc->p_pid; 602 break; 603 604 #ifdef PPP_COMPRESS 605 case PPPIOCSCOMPRESS: 606 odp = (struct ppp_option_data *) data; 607 nb = odp->length; 608 if (nb > sizeof(ccp_option)) 609 nb = sizeof(ccp_option); 610 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 611 return (error); 612 /* preliminary check on the length byte */ 613 if (ccp_option[1] < 2) 614 return (EINVAL); 615 cp = ppp_get_compressor(ccp_option[0]); 616 if (cp == NULL) { 617 if (sc->sc_flags & SC_DEBUG) 618 printf("%s: no compressor for [%x %x %x], %x\n", 619 sc->sc_if.if_xname, ccp_option[0], 620 ccp_option[1], ccp_option[2], nb); 621 return (EINVAL); /* no handler found */ 622 } 623 /* 624 * Found a handler for the protocol - try to allocate 625 * a compressor or decompressor. 626 */ 627 error = 0; 628 if (odp->transmit) { 629 s = splsoftnet(); 630 if (sc->sc_xc_state != NULL) { 631 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 632 ppp_compressor_rele(sc->sc_xcomp); 633 } 634 sc->sc_xcomp = cp; 635 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 636 if (sc->sc_xc_state == NULL) { 637 if (sc->sc_flags & SC_DEBUG) 638 printf("%s: comp_alloc failed\n", 639 sc->sc_if.if_xname); 640 error = ENOBUFS; 641 } 642 splhigh(); /* XXX IMP ME HARDER */ 643 sc->sc_flags &= ~SC_COMP_RUN; 644 splx(s); 645 } else { 646 s = splsoftnet(); 647 if (sc->sc_rc_state != NULL) { 648 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 649 ppp_compressor_rele(sc->sc_rcomp); 650 } 651 sc->sc_rcomp = cp; 652 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 653 if (sc->sc_rc_state == NULL) { 654 if (sc->sc_flags & SC_DEBUG) 655 printf("%s: decomp_alloc failed\n", 656 sc->sc_if.if_xname); 657 error = ENOBUFS; 658 } 659 splhigh(); /* XXX IMP ME HARDER */ 660 sc->sc_flags &= ~SC_DECOMP_RUN; 661 splx(s); 662 } 663 return (error); 664 #endif /* PPP_COMPRESS */ 665 666 case PPPIOCGNPMODE: 667 case PPPIOCSNPMODE: 668 npi = (struct npioctl *) data; 669 switch (npi->protocol) { 670 case PPP_IP: 671 npx = NP_IP; 672 break; 673 case PPP_IPV6: 674 npx = NP_IPV6; 675 break; 676 default: 677 return EINVAL; 678 } 679 if (cmd == PPPIOCGNPMODE) { 680 npi->mode = sc->sc_npmode[npx]; 681 } else { 682 if (npi->mode != sc->sc_npmode[npx]) { 683 s = splnet(); 684 sc->sc_npmode[npx] = npi->mode; 685 if (npi->mode != NPMODE_QUEUE) { 686 ppp_requeue(sc); 687 ppp_restart(sc); 688 } 689 splx(s); 690 } 691 } 692 break; 693 694 case PPPIOCGIDLE: 695 s = splsoftnet(); 696 t = time_second; 697 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 698 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 699 splx(s); 700 break; 701 702 #ifdef PPP_FILTER 703 case PPPIOCSPASS: 704 case PPPIOCSACTIVE: 705 /* These are no longer supported. */ 706 return EOPNOTSUPP; 707 708 case PPPIOCSIPASS: 709 case PPPIOCSOPASS: 710 case PPPIOCSIACTIVE: 711 case PPPIOCSOACTIVE: 712 nbp = (struct bpf_program *) data; 713 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 714 return EINVAL; 715 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 716 if (newcodelen != 0) { 717 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 718 /* WAITOK -- malloc() never fails. */ 719 if ((error = copyin((void *)nbp->bf_insns, 720 (void *)newcode, newcodelen)) != 0) { 721 free(newcode, M_DEVBUF); 722 return error; 723 } 724 if (!bpf_validate(newcode, nbp->bf_len)) { 725 free(newcode, M_DEVBUF); 726 return EINVAL; 727 } 728 } else 729 newcode = 0; 730 switch (cmd) { 731 case PPPIOCSIPASS: 732 bp = &sc->sc_pass_filt_in; 733 break; 734 735 case PPPIOCSOPASS: 736 bp = &sc->sc_pass_filt_out; 737 break; 738 739 case PPPIOCSIACTIVE: 740 bp = &sc->sc_active_filt_in; 741 break; 742 743 case PPPIOCSOACTIVE: 744 bp = &sc->sc_active_filt_out; 745 break; 746 default: 747 free(newcode, M_DEVBUF); 748 return (EPASSTHROUGH); 749 } 750 oldcode = bp->bf_insns; 751 s = splnet(); 752 bp->bf_len = nbp->bf_len; 753 bp->bf_insns = newcode; 754 splx(s); 755 if (oldcode != 0) 756 free(oldcode, M_DEVBUF); 757 break; 758 #endif /* PPP_FILTER */ 759 760 default: 761 return (EPASSTHROUGH); 762 } 763 return (0); 764 } 765 766 /* 767 * Process an ioctl request to the ppp network interface. 768 */ 769 static int 770 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 771 { 772 struct ppp_softc *sc = ifp->if_softc; 773 struct ifaddr *ifa = (struct ifaddr *)data; 774 struct ifreq *ifr = (struct ifreq *)data; 775 struct ppp_stats *psp; 776 #ifdef PPP_COMPRESS 777 struct ppp_comp_stats *pcp; 778 #endif 779 int s = splnet(), error = 0; 780 781 switch (cmd) { 782 case SIOCSIFFLAGS: 783 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 784 break; 785 if ((ifp->if_flags & IFF_RUNNING) == 0) 786 ifp->if_flags &= ~IFF_UP; 787 break; 788 789 case SIOCINITIFADDR: 790 switch (ifa->ifa_addr->sa_family) { 791 #ifdef INET 792 case AF_INET: 793 break; 794 #endif 795 #ifdef INET6 796 case AF_INET6: 797 break; 798 #endif 799 default: 800 error = EAFNOSUPPORT; 801 break; 802 } 803 ifa->ifa_rtrequest = p2p_rtrequest; 804 break; 805 806 case SIOCADDMULTI: 807 case SIOCDELMULTI: 808 if (ifr == NULL) { 809 error = EAFNOSUPPORT; 810 break; 811 } 812 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 813 #ifdef INET 814 case AF_INET: 815 break; 816 #endif 817 #ifdef INET6 818 case AF_INET6: 819 break; 820 #endif 821 default: 822 error = EAFNOSUPPORT; 823 break; 824 } 825 break; 826 827 case SIOCGPPPSTATS: 828 psp = &((struct ifpppstatsreq *) data)->stats; 829 memset(psp, 0, sizeof(*psp)); 830 psp->p = sc->sc_stats; 831 #if defined(VJC) && !defined(SL_NO_STATS) 832 if (sc->sc_comp) { 833 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 834 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 835 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 836 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 837 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 838 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 839 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 840 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 841 } 842 #endif /* VJC */ 843 break; 844 845 #ifdef PPP_COMPRESS 846 case SIOCGPPPCSTATS: 847 pcp = &((struct ifpppcstatsreq *) data)->stats; 848 memset(pcp, 0, sizeof(*pcp)); 849 if (sc->sc_xc_state != NULL) 850 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 851 if (sc->sc_rc_state != NULL) 852 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 853 break; 854 #endif /* PPP_COMPRESS */ 855 856 default: 857 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 858 error = 0; 859 break; 860 } 861 splx(s); 862 return (error); 863 } 864 865 /* 866 * Queue a packet. Start transmission if not active. 867 * Packet is placed in Information field of PPP frame. 868 */ 869 int 870 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 871 const struct rtentry *rtp) 872 { 873 struct ppp_softc *sc = ifp->if_softc; 874 int protocol, address, control; 875 u_char *cp; 876 int s, error; 877 #ifdef INET 878 struct ip *ip; 879 #endif 880 struct ifqueue *ifq; 881 enum NPmode mode; 882 int len; 883 884 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 885 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 886 error = ENETDOWN; /* sort of */ 887 goto bad; 888 } 889 890 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 891 892 /* 893 * Compute PPP header. 894 */ 895 m0->m_flags &= ~M_HIGHPRI; 896 switch (dst->sa_family) { 897 #ifdef INET 898 case AF_INET: 899 address = PPP_ALLSTATIONS; 900 control = PPP_UI; 901 protocol = PPP_IP; 902 mode = sc->sc_npmode[NP_IP]; 903 904 /* 905 * If this packet has the "low delay" bit set in the IP header, 906 * put it on the fastq instead. 907 */ 908 ip = mtod(m0, struct ip *); 909 if (ip->ip_tos & IPTOS_LOWDELAY) 910 m0->m_flags |= M_HIGHPRI; 911 break; 912 #endif 913 #ifdef INET6 914 case AF_INET6: 915 address = PPP_ALLSTATIONS; /*XXX*/ 916 control = PPP_UI; /*XXX*/ 917 protocol = PPP_IPV6; 918 mode = sc->sc_npmode[NP_IPV6]; 919 920 #if 0 /* XXX flowinfo/traffic class, maybe? */ 921 /* 922 * If this packet has the "low delay" bit set in the IP header, 923 * put it on the fastq instead. 924 */ 925 ip = mtod(m0, struct ip *); 926 if (ip->ip_tos & IPTOS_LOWDELAY) 927 m0->m_flags |= M_HIGHPRI; 928 #endif 929 break; 930 #endif 931 case AF_UNSPEC: 932 address = PPP_ADDRESS(dst->sa_data); 933 control = PPP_CONTROL(dst->sa_data); 934 protocol = PPP_PROTOCOL(dst->sa_data); 935 mode = NPMODE_PASS; 936 break; 937 default: 938 printf("%s: af%d not supported\n", ifp->if_xname, 939 dst->sa_family); 940 error = EAFNOSUPPORT; 941 goto bad; 942 } 943 944 /* 945 * Drop this packet, or return an error, if necessary. 946 */ 947 if (mode == NPMODE_ERROR) { 948 error = ENETDOWN; 949 goto bad; 950 } 951 if (mode == NPMODE_DROP) { 952 error = 0; 953 goto bad; 954 } 955 956 /* 957 * Add PPP header. 958 */ 959 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 960 if (m0 == NULL) { 961 error = ENOBUFS; 962 goto bad; 963 } 964 965 cp = mtod(m0, u_char *); 966 *cp++ = address; 967 *cp++ = control; 968 *cp++ = protocol >> 8; 969 *cp++ = protocol & 0xff; 970 971 len = m_length(m0); 972 973 if (sc->sc_flags & SC_LOG_OUTPKT) { 974 printf("%s output: ", ifp->if_xname); 975 pppdumpm(m0); 976 } 977 978 if ((protocol & 0x8000) == 0) { 979 #ifdef PPP_FILTER 980 /* 981 * Apply the pass and active filters to the packet, 982 * but only if it is a data packet. 983 */ 984 if (sc->sc_pass_filt_out.bf_insns != 0 985 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 986 (u_char *)m0, len, 0) == 0) { 987 error = 0; /* drop this packet */ 988 goto bad; 989 } 990 991 /* 992 * Update the time we sent the most recent packet. 993 */ 994 if (sc->sc_active_filt_out.bf_insns == 0 995 || bpf_filter(sc->sc_active_filt_out.bf_insns, 996 (u_char *)m0, len, 0)) 997 sc->sc_last_sent = time_second; 998 #else 999 /* 1000 * Update the time we sent the most recent packet. 1001 */ 1002 sc->sc_last_sent = time_second; 1003 #endif /* PPP_FILTER */ 1004 } 1005 1006 /* 1007 * See if bpf wants to look at the packet. 1008 */ 1009 bpf_mtap(&sc->sc_if, m0); 1010 1011 /* 1012 * Put the packet on the appropriate queue. 1013 */ 1014 s = splnet(); 1015 if (mode == NPMODE_QUEUE) { 1016 /* XXX we should limit the number of packets on this queue */ 1017 *sc->sc_npqtail = m0; 1018 m0->m_nextpkt = NULL; 1019 sc->sc_npqtail = &m0->m_nextpkt; 1020 } else { 1021 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1022 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1023 splx(s); 1024 sc->sc_if.if_oerrors++; 1025 sc->sc_stats.ppp_oerrors++; 1026 return (error); 1027 } 1028 ppp_restart(sc); 1029 } 1030 ifp->if_opackets++; 1031 ifp->if_obytes += len; 1032 1033 splx(s); 1034 return (0); 1035 1036 bad: 1037 m_freem(m0); 1038 return (error); 1039 } 1040 1041 /* 1042 * After a change in the NPmode for some NP, move packets from the 1043 * npqueue to the send queue or the fast queue as appropriate. 1044 * Should be called at splnet, since we muck with the queues. 1045 */ 1046 static void 1047 ppp_requeue(struct ppp_softc *sc) 1048 { 1049 struct mbuf *m, **mpp; 1050 struct ifqueue *ifq; 1051 enum NPmode mode; 1052 int error; 1053 1054 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1055 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1056 case PPP_IP: 1057 mode = sc->sc_npmode[NP_IP]; 1058 break; 1059 case PPP_IPV6: 1060 mode = sc->sc_npmode[NP_IPV6]; 1061 break; 1062 default: 1063 mode = NPMODE_PASS; 1064 } 1065 1066 switch (mode) { 1067 case NPMODE_PASS: 1068 /* 1069 * This packet can now go on one of the queues to 1070 * be sent. 1071 */ 1072 *mpp = m->m_nextpkt; 1073 m->m_nextpkt = NULL; 1074 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1075 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1076 sc->sc_if.if_oerrors++; 1077 sc->sc_stats.ppp_oerrors++; 1078 } 1079 break; 1080 1081 case NPMODE_DROP: 1082 case NPMODE_ERROR: 1083 *mpp = m->m_nextpkt; 1084 m_freem(m); 1085 break; 1086 1087 case NPMODE_QUEUE: 1088 mpp = &m->m_nextpkt; 1089 break; 1090 } 1091 } 1092 sc->sc_npqtail = mpp; 1093 } 1094 1095 /* 1096 * Transmitter has finished outputting some stuff; 1097 * remember to call sc->sc_start later at splsoftnet. 1098 */ 1099 void 1100 ppp_restart(struct ppp_softc *sc) 1101 { 1102 int s = splhigh(); /* XXX IMP ME HARDER */ 1103 1104 sc->sc_flags &= ~SC_TBUSY; 1105 softint_schedule(sc->sc_si); 1106 splx(s); 1107 } 1108 1109 /* 1110 * Get a packet to send. This procedure is intended to be called at 1111 * splsoftnet, since it may involve time-consuming operations such as 1112 * applying VJ compression, packet compression, address/control and/or 1113 * protocol field compression to the packet. 1114 */ 1115 struct mbuf * 1116 ppp_dequeue(struct ppp_softc *sc) 1117 { 1118 struct mbuf *m, *mp; 1119 u_char *cp; 1120 int address, control, protocol; 1121 int s; 1122 1123 /* 1124 * Grab a packet to send: first try the fast queue, then the 1125 * normal queue. 1126 */ 1127 s = splnet(); 1128 if (sc->sc_nfastq < sc->sc_maxfastq) { 1129 IF_DEQUEUE(&sc->sc_fastq, m); 1130 if (m != NULL) 1131 sc->sc_nfastq++; 1132 else 1133 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1134 } else { 1135 sc->sc_nfastq = 0; 1136 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1137 if (m == NULL) { 1138 IF_DEQUEUE(&sc->sc_fastq, m); 1139 if (m != NULL) 1140 sc->sc_nfastq++; 1141 } 1142 } 1143 splx(s); 1144 1145 if (m == NULL) 1146 return NULL; 1147 1148 ++sc->sc_stats.ppp_opackets; 1149 1150 /* 1151 * Extract the ppp header of the new packet. 1152 * The ppp header will be in one mbuf. 1153 */ 1154 cp = mtod(m, u_char *); 1155 address = PPP_ADDRESS(cp); 1156 control = PPP_CONTROL(cp); 1157 protocol = PPP_PROTOCOL(cp); 1158 1159 switch (protocol) { 1160 case PPP_IP: 1161 #ifdef VJC 1162 /* 1163 * If the packet is a TCP/IP packet, see if we can compress it. 1164 */ 1165 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1166 struct ip *ip; 1167 int type; 1168 1169 mp = m; 1170 ip = (struct ip *) (cp + PPP_HDRLEN); 1171 if (mp->m_len <= PPP_HDRLEN) { 1172 mp = mp->m_next; 1173 if (mp == NULL) 1174 break; 1175 ip = mtod(mp, struct ip *); 1176 } 1177 /* 1178 * This code assumes the IP/TCP header is in one 1179 * non-shared mbuf 1180 */ 1181 if (ip->ip_p == IPPROTO_TCP) { 1182 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1183 !(sc->sc_flags & SC_NO_TCP_CCID)); 1184 switch (type) { 1185 case TYPE_UNCOMPRESSED_TCP: 1186 protocol = PPP_VJC_UNCOMP; 1187 break; 1188 case TYPE_COMPRESSED_TCP: 1189 protocol = PPP_VJC_COMP; 1190 cp = mtod(m, u_char *); 1191 cp[0] = address; /* Header has moved */ 1192 cp[1] = control; 1193 cp[2] = 0; 1194 break; 1195 } 1196 /* Update protocol in PPP header */ 1197 cp[3] = protocol; 1198 } 1199 } 1200 #endif /* VJC */ 1201 break; 1202 1203 #ifdef PPP_COMPRESS 1204 case PPP_CCP: 1205 ppp_ccp(sc, m, 0); 1206 break; 1207 #endif /* PPP_COMPRESS */ 1208 } 1209 1210 #ifdef PPP_COMPRESS 1211 if (protocol != PPP_LCP && protocol != PPP_CCP 1212 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1213 struct mbuf *mcomp = NULL; 1214 int slen; 1215 1216 slen = 0; 1217 for (mp = m; mp != NULL; mp = mp->m_next) 1218 slen += mp->m_len; 1219 (*sc->sc_xcomp->compress) 1220 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1221 if (mcomp != NULL) { 1222 if (sc->sc_flags & SC_CCP_UP) { 1223 /* 1224 * Send the compressed packet instead of the 1225 * original. 1226 */ 1227 m_freem(m); 1228 m = mcomp; 1229 cp = mtod(m, u_char *); 1230 protocol = cp[3]; 1231 } else { 1232 /* 1233 * Can't transmit compressed packets until CCP 1234 * is up. 1235 */ 1236 m_freem(mcomp); 1237 } 1238 } 1239 } 1240 #endif /* PPP_COMPRESS */ 1241 1242 /* 1243 * Compress the address/control and protocol, if possible. 1244 */ 1245 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1246 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1247 protocol != PPP_LCP) { 1248 /* can compress address/control */ 1249 m->m_data += 2; 1250 m->m_len -= 2; 1251 } 1252 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1253 /* can compress protocol */ 1254 if (mtod(m, u_char *) == cp) { 1255 cp[2] = cp[1]; /* move address/control up */ 1256 cp[1] = cp[0]; 1257 } 1258 ++m->m_data; 1259 --m->m_len; 1260 } 1261 1262 return m; 1263 } 1264 1265 /* 1266 * Software interrupt routine, called at splsoftnet. 1267 */ 1268 static void 1269 pppintr(void *arg) 1270 { 1271 struct ppp_softc *sc = arg; 1272 struct mbuf *m; 1273 int s; 1274 1275 mutex_enter(softnet_lock); 1276 if (!(sc->sc_flags & SC_TBUSY) 1277 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1278 || sc->sc_outm)) { 1279 s = splhigh(); /* XXX IMP ME HARDER */ 1280 sc->sc_flags |= SC_TBUSY; 1281 splx(s); 1282 (*sc->sc_start)(sc); 1283 } 1284 for (;;) { 1285 s = splnet(); 1286 IF_DEQUEUE(&sc->sc_rawq, m); 1287 splx(s); 1288 if (m == NULL) 1289 break; 1290 ppp_inproc(sc, m); 1291 } 1292 mutex_exit(softnet_lock); 1293 } 1294 1295 #ifdef PPP_COMPRESS 1296 /* 1297 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1298 * 0 if it is about to be transmitted. 1299 */ 1300 static void 1301 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1302 { 1303 u_char *dp, *ep; 1304 struct mbuf *mp; 1305 int slen, s; 1306 1307 /* 1308 * Get a pointer to the data after the PPP header. 1309 */ 1310 if (m->m_len <= PPP_HDRLEN) { 1311 mp = m->m_next; 1312 if (mp == NULL) 1313 return; 1314 dp = mtod(mp, u_char *); 1315 } else { 1316 mp = m; 1317 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1318 } 1319 1320 ep = mtod(mp, u_char *) + mp->m_len; 1321 if (dp + CCP_HDRLEN > ep) 1322 return; 1323 slen = CCP_LENGTH(dp); 1324 if (dp + slen > ep) { 1325 if (sc->sc_flags & SC_DEBUG) 1326 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1327 dp, slen, mtod(mp, u_char *), mp->m_len); 1328 return; 1329 } 1330 1331 switch (CCP_CODE(dp)) { 1332 case CCP_CONFREQ: 1333 case CCP_TERMREQ: 1334 case CCP_TERMACK: 1335 /* CCP must be going down - disable compression */ 1336 if (sc->sc_flags & SC_CCP_UP) { 1337 s = splhigh(); /* XXX IMP ME HARDER */ 1338 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1339 splx(s); 1340 } 1341 break; 1342 1343 case CCP_CONFACK: 1344 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1345 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1346 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1347 if (!rcvd) { 1348 /* We're agreeing to send compressed packets. */ 1349 if (sc->sc_xc_state != NULL 1350 && (*sc->sc_xcomp->comp_init) 1351 (sc->sc_xc_state, dp + CCP_HDRLEN, 1352 slen - CCP_HDRLEN, sc->sc_unit, 0, 1353 sc->sc_flags & SC_DEBUG)) { 1354 s = splhigh(); /* XXX IMP ME HARDER */ 1355 sc->sc_flags |= SC_COMP_RUN; 1356 splx(s); 1357 } 1358 } else { 1359 /* 1360 * Peer is agreeing to send compressed 1361 * packets. 1362 */ 1363 if (sc->sc_rc_state != NULL 1364 && (*sc->sc_rcomp->decomp_init) 1365 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1366 sc->sc_unit, 0, sc->sc_mru, 1367 sc->sc_flags & SC_DEBUG)) { 1368 s = splhigh(); /* XXX IMP ME HARDER */ 1369 sc->sc_flags |= SC_DECOMP_RUN; 1370 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1371 splx(s); 1372 } 1373 } 1374 } 1375 break; 1376 1377 case CCP_RESETACK: 1378 if (sc->sc_flags & SC_CCP_UP) { 1379 if (!rcvd) { 1380 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1381 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1382 } else { 1383 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1384 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1385 s = splhigh(); /* XXX IMP ME HARDER */ 1386 sc->sc_flags &= ~SC_DC_ERROR; 1387 splx(s); 1388 } 1389 } 1390 } 1391 break; 1392 } 1393 } 1394 1395 /* 1396 * CCP is down; free (de)compressor state if necessary. 1397 */ 1398 static void 1399 ppp_ccp_closed(struct ppp_softc *sc) 1400 { 1401 if (sc->sc_xc_state) { 1402 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1403 ppp_compressor_rele(sc->sc_xcomp); 1404 sc->sc_xc_state = NULL; 1405 } 1406 if (sc->sc_rc_state) { 1407 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1408 ppp_compressor_rele(sc->sc_rcomp); 1409 sc->sc_rc_state = NULL; 1410 } 1411 } 1412 #endif /* PPP_COMPRESS */ 1413 1414 /* 1415 * PPP packet input routine. 1416 * The caller has checked and removed the FCS and has inserted 1417 * the address/control bytes and the protocol high byte if they 1418 * were omitted. 1419 */ 1420 void 1421 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1422 { 1423 int s = splhigh(); /* XXX IMP ME HARDER */ 1424 1425 if (lost) 1426 m->m_flags |= M_ERRMARK; 1427 IF_ENQUEUE(&sc->sc_rawq, m); 1428 softint_schedule(sc->sc_si); 1429 splx(s); 1430 } 1431 1432 /* 1433 * Process a received PPP packet, doing decompression as necessary. 1434 * Should be called at splsoftnet. 1435 */ 1436 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1437 TYPE_UNCOMPRESSED_TCP) 1438 1439 static void 1440 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1441 { 1442 struct ifnet *ifp = &sc->sc_if; 1443 pktqueue_t *pktq = NULL; 1444 struct ifqueue *inq = NULL; 1445 int s, ilen, proto, rv; 1446 u_char *cp, adrs, ctrl; 1447 struct mbuf *mp, *dmp = NULL; 1448 #ifdef VJC 1449 int xlen; 1450 u_char *iphdr; 1451 u_int hlen; 1452 #endif 1453 1454 sc->sc_stats.ppp_ipackets++; 1455 1456 if (sc->sc_flags & SC_LOG_INPKT) { 1457 ilen = 0; 1458 for (mp = m; mp != NULL; mp = mp->m_next) 1459 ilen += mp->m_len; 1460 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1461 pppdumpm(m); 1462 } 1463 1464 cp = mtod(m, u_char *); 1465 adrs = PPP_ADDRESS(cp); 1466 ctrl = PPP_CONTROL(cp); 1467 proto = PPP_PROTOCOL(cp); 1468 1469 if (m->m_flags & M_ERRMARK) { 1470 m->m_flags &= ~M_ERRMARK; 1471 s = splhigh(); /* XXX IMP ME HARDER */ 1472 sc->sc_flags |= SC_VJ_RESET; 1473 splx(s); 1474 } 1475 1476 #ifdef PPP_COMPRESS 1477 /* 1478 * Decompress this packet if necessary, update the receiver's 1479 * dictionary, or take appropriate action on a CCP packet. 1480 */ 1481 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1482 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1483 /* Decompress this packet */ 1484 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1485 if (rv == DECOMP_OK) { 1486 m_freem(m); 1487 if (dmp == NULL) { 1488 /* 1489 * No error, but no decompressed packet 1490 * produced 1491 */ 1492 return; 1493 } 1494 m = dmp; 1495 cp = mtod(m, u_char *); 1496 proto = PPP_PROTOCOL(cp); 1497 1498 } else { 1499 /* 1500 * An error has occurred in decompression. 1501 * Pass the compressed packet up to pppd, which may 1502 * take CCP down or issue a Reset-Req. 1503 */ 1504 if (sc->sc_flags & SC_DEBUG) 1505 printf("%s: decompress failed %d\n", 1506 ifp->if_xname, rv); 1507 s = splhigh(); /* XXX IMP ME HARDER */ 1508 sc->sc_flags |= SC_VJ_RESET; 1509 if (rv == DECOMP_ERROR) 1510 sc->sc_flags |= SC_DC_ERROR; 1511 else 1512 sc->sc_flags |= SC_DC_FERROR; 1513 splx(s); 1514 } 1515 1516 } else { 1517 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1518 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1519 if (proto == PPP_CCP) 1520 ppp_ccp(sc, m, 1); 1521 } 1522 #endif 1523 1524 ilen = 0; 1525 for (mp = m; mp != NULL; mp = mp->m_next) 1526 ilen += mp->m_len; 1527 1528 #ifdef VJC 1529 if (sc->sc_flags & SC_VJ_RESET) { 1530 /* 1531 * If we've missed a packet, we must toss subsequent compressed 1532 * packets which don't have an explicit connection ID. 1533 */ 1534 if (sc->sc_comp) 1535 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1536 s = splhigh(); /* XXX IMP ME HARDER */ 1537 sc->sc_flags &= ~SC_VJ_RESET; 1538 splx(s); 1539 } 1540 1541 /* 1542 * See if we have a VJ-compressed packet to uncompress. 1543 */ 1544 if (proto == PPP_VJC_COMP) { 1545 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1546 goto bad; 1547 1548 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1549 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1550 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1551 1552 if (xlen <= 0) { 1553 if (sc->sc_flags & SC_DEBUG) 1554 printf("%s: VJ uncompress failed on type comp\n", 1555 ifp->if_xname); 1556 goto bad; 1557 } 1558 1559 /* Copy the PPP and IP headers into a new mbuf. */ 1560 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1561 if (mp == NULL) 1562 goto bad; 1563 mp->m_len = 0; 1564 mp->m_next = NULL; 1565 if (hlen + PPP_HDRLEN > MHLEN) { 1566 MCLGET(mp, M_DONTWAIT); 1567 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1568 /* Lose if big headers and no clusters */ 1569 m_freem(mp); 1570 goto bad; 1571 } 1572 } 1573 cp = mtod(mp, u_char *); 1574 cp[0] = adrs; 1575 cp[1] = ctrl; 1576 cp[2] = 0; 1577 cp[3] = PPP_IP; 1578 proto = PPP_IP; 1579 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1580 mp->m_len = hlen + PPP_HDRLEN; 1581 1582 /* 1583 * Trim the PPP and VJ headers off the old mbuf 1584 * and stick the new and old mbufs together. 1585 */ 1586 m->m_data += PPP_HDRLEN + xlen; 1587 m->m_len -= PPP_HDRLEN + xlen; 1588 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1589 bcopy(mtod(m, u_char *), 1590 mtod(mp, u_char *) + mp->m_len, m->m_len); 1591 mp->m_len += m->m_len; 1592 mp->m_next = m_free(m); 1593 } else 1594 mp->m_next = m; 1595 m = mp; 1596 ilen += hlen - xlen; 1597 1598 } else if (proto == PPP_VJC_UNCOMP) { 1599 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1600 goto bad; 1601 1602 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1603 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1604 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1605 1606 if (xlen < 0) { 1607 if (sc->sc_flags & SC_DEBUG) 1608 printf("%s: VJ uncompress failed on type uncomp\n", 1609 ifp->if_xname); 1610 goto bad; 1611 } 1612 1613 proto = PPP_IP; 1614 cp[3] = PPP_IP; 1615 } 1616 #endif /* VJC */ 1617 1618 /* 1619 * If the packet will fit in a header mbuf, don't waste a 1620 * whole cluster on it. 1621 */ 1622 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1623 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1624 if (mp != NULL) { 1625 m_copydata(m, 0, ilen, mtod(mp, void *)); 1626 m_freem(m); 1627 m = mp; 1628 m->m_len = ilen; 1629 } 1630 } 1631 m->m_pkthdr.len = ilen; 1632 m_set_rcvif(m, ifp); 1633 1634 if ((proto & 0x8000) == 0) { 1635 #ifdef PPP_FILTER 1636 /* 1637 * See whether we want to pass this packet, and 1638 * if it counts as link activity. 1639 */ 1640 if (sc->sc_pass_filt_in.bf_insns != 0 1641 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1642 (u_char *)m, ilen, 0) == 0) { 1643 /* drop this packet */ 1644 m_freem(m); 1645 return; 1646 } 1647 if (sc->sc_active_filt_in.bf_insns == 0 1648 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1649 (u_char *)m, ilen, 0)) 1650 sc->sc_last_recv = time_second; 1651 #else 1652 /* 1653 * Record the time that we received this packet. 1654 */ 1655 sc->sc_last_recv = time_second; 1656 #endif /* PPP_FILTER */ 1657 } 1658 1659 /* See if bpf wants to look at the packet. */ 1660 bpf_mtap(&sc->sc_if, m); 1661 1662 switch (proto) { 1663 #ifdef INET 1664 case PPP_IP: 1665 /* 1666 * IP packet - take off the ppp header and pass it up to IP. 1667 */ 1668 if ((ifp->if_flags & IFF_UP) == 0 1669 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1670 /* Interface is down - drop the packet. */ 1671 m_freem(m); 1672 return; 1673 } 1674 m->m_pkthdr.len -= PPP_HDRLEN; 1675 m->m_data += PPP_HDRLEN; 1676 m->m_len -= PPP_HDRLEN; 1677 #ifdef GATEWAY 1678 if (ipflow_fastforward(m)) 1679 return; 1680 #endif 1681 pktq = ip_pktq; 1682 break; 1683 #endif 1684 1685 #ifdef INET6 1686 case PPP_IPV6: 1687 /* 1688 * IPv6 packet - take off the ppp header and pass it up to 1689 * IPv6. 1690 */ 1691 if ((ifp->if_flags & IFF_UP) == 0 1692 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1693 /* interface is down - drop the packet. */ 1694 m_freem(m); 1695 return; 1696 } 1697 m->m_pkthdr.len -= PPP_HDRLEN; 1698 m->m_data += PPP_HDRLEN; 1699 m->m_len -= PPP_HDRLEN; 1700 #ifdef GATEWAY 1701 if (ip6flow_fastforward(&m)) 1702 return; 1703 #endif 1704 pktq = ip6_pktq; 1705 break; 1706 #endif 1707 1708 default: 1709 /* 1710 * Some other protocol - place on input queue for read(). 1711 */ 1712 inq = &sc->sc_inq; 1713 pktq = NULL; 1714 break; 1715 } 1716 1717 /* 1718 * Put the packet on the appropriate input queue. 1719 */ 1720 s = splnet(); 1721 1722 /* pktq: inet or inet6 cases */ 1723 if (__predict_true(pktq)) { 1724 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1725 ifp->if_iqdrops++; 1726 goto bad; 1727 } 1728 ifp->if_ipackets++; 1729 ifp->if_ibytes += ilen; 1730 splx(s); 1731 return; 1732 } 1733 1734 /* ifq: other protocol cases */ 1735 if (!inq) { 1736 goto bad; 1737 } 1738 if (IF_QFULL(inq)) { 1739 IF_DROP(inq); 1740 splx(s); 1741 if (sc->sc_flags & SC_DEBUG) 1742 printf("%s: input queue full\n", ifp->if_xname); 1743 ifp->if_iqdrops++; 1744 goto bad; 1745 } 1746 IF_ENQUEUE(inq, m); 1747 splx(s); 1748 ifp->if_ipackets++; 1749 ifp->if_ibytes += ilen; 1750 1751 (*sc->sc_ctlp)(sc); 1752 1753 return; 1754 1755 bad: 1756 m_freem(m); 1757 sc->sc_if.if_ierrors++; 1758 sc->sc_stats.ppp_ierrors++; 1759 } 1760 1761 #define MAX_DUMP_BYTES 128 1762 1763 static void 1764 pppdumpm(struct mbuf *m0) 1765 { 1766 char buf[3*MAX_DUMP_BYTES+4]; 1767 char *bp = buf; 1768 struct mbuf *m; 1769 1770 for (m = m0; m; m = m->m_next) { 1771 int l = m->m_len; 1772 u_char *rptr = (u_char *)m->m_data; 1773 1774 while (l--) { 1775 if (bp > buf + sizeof(buf) - 4) 1776 goto done; 1777 /* Convert byte to ascii hex */ 1778 *bp++ = hexdigits[*rptr >> 4]; 1779 *bp++ = hexdigits[*rptr++ & 0xf]; 1780 } 1781 1782 if (m->m_next) { 1783 if (bp > buf + sizeof(buf) - 3) 1784 goto done; 1785 *bp++ = '|'; 1786 } else 1787 *bp++ = ' '; 1788 } 1789 done: 1790 if (m) 1791 *bp++ = '>'; 1792 *bp = 0; 1793 printf("%s\n", buf); 1794 } 1795 1796 #ifdef ALTQ 1797 /* 1798 * A wrapper to transmit a packet from if_start since ALTQ uses 1799 * if_start to send a packet. 1800 */ 1801 static void 1802 ppp_ifstart(struct ifnet *ifp) 1803 { 1804 struct ppp_softc *sc; 1805 1806 sc = ifp->if_softc; 1807 (*sc->sc_start)(sc); 1808 } 1809 #endif 1810 1811 static const struct ppp_known_compressor { 1812 uint8_t code; 1813 const char *module; 1814 } ppp_known_compressors[] = { 1815 { CI_DEFLATE, "ppp_deflate" }, 1816 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1817 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1818 { CI_MPPE, "ppp_mppe" }, 1819 { 0, NULL } 1820 }; 1821 1822 static int 1823 ppp_compressor_init(void) 1824 { 1825 1826 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1827 return 0; 1828 } 1829 1830 static int 1831 ppp_compressor_destroy(void) 1832 { 1833 1834 mutex_destroy(&ppp_compressors_mtx); 1835 return 0; 1836 } 1837 1838 static void 1839 ppp_compressor_rele(struct compressor *cp) 1840 { 1841 1842 mutex_enter(&ppp_compressors_mtx); 1843 --cp->comp_refcnt; 1844 mutex_exit(&ppp_compressors_mtx); 1845 } 1846 1847 static struct compressor * 1848 ppp_get_compressor_noload(uint8_t ci, bool hold) 1849 { 1850 struct compressor *cp; 1851 1852 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1853 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1854 if (cp->compress_proto == ci) { 1855 if (hold) 1856 ++cp->comp_refcnt; 1857 return cp; 1858 } 1859 } 1860 1861 return NULL; 1862 } 1863 1864 static struct compressor * 1865 ppp_get_compressor(uint8_t ci) 1866 { 1867 struct compressor *cp = NULL; 1868 const struct ppp_known_compressor *pkc; 1869 1870 mutex_enter(&ppp_compressors_mtx); 1871 cp = ppp_get_compressor_noload(ci, true); 1872 mutex_exit(&ppp_compressors_mtx); 1873 if (cp != NULL) 1874 return cp; 1875 1876 kernconfig_lock(); 1877 mutex_enter(&ppp_compressors_mtx); 1878 cp = ppp_get_compressor_noload(ci, true); 1879 mutex_exit(&ppp_compressors_mtx); 1880 if (cp == NULL) { 1881 /* Not found, so try to autoload a module */ 1882 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1883 if (pkc->code == ci) { 1884 if (module_autoload(pkc->module, 1885 MODULE_CLASS_MISC) != 0) 1886 break; 1887 mutex_enter(&ppp_compressors_mtx); 1888 cp = ppp_get_compressor_noload(ci, true); 1889 mutex_exit(&ppp_compressors_mtx); 1890 break; 1891 } 1892 } 1893 } 1894 kernconfig_unlock(); 1895 1896 return cp; 1897 } 1898 1899 int 1900 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1901 { 1902 int error = 0; 1903 size_t i; 1904 1905 mutex_enter(&ppp_compressors_mtx); 1906 for (i = 0; i < ncomp; i++) { 1907 if (ppp_get_compressor_noload(pc[i].compress_proto, 1908 false) != NULL) 1909 error = EEXIST; 1910 } 1911 if (!error) { 1912 for (i = 0; i < ncomp; i++) { 1913 pc[i].comp_refcnt = 0; 1914 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1915 } 1916 } 1917 mutex_exit(&ppp_compressors_mtx); 1918 1919 return error; 1920 } 1921 1922 int 1923 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1924 { 1925 int error = 0; 1926 size_t i; 1927 1928 mutex_enter(&ppp_compressors_mtx); 1929 for (i = 0; i < ncomp; i++) { 1930 if (ppp_get_compressor_noload(pc[i].compress_proto, 1931 false) != &pc[i]) 1932 error = ENOENT; 1933 else if (pc[i].comp_refcnt != 0) 1934 error = EBUSY; 1935 } 1936 if (!error) { 1937 for (i = 0; i < ncomp; i++) { 1938 LIST_REMOVE(&pc[i], comp_list); 1939 } 1940 } 1941 mutex_exit(&ppp_compressors_mtx); 1942 1943 return error; 1944 } 1945 1946 /* 1947 * Module infrastructure 1948 */ 1949 #include "if_module.h" 1950 1951 #ifdef PPP_FILTER 1952 #define PPP_DEP "bpf_filter," 1953 #else 1954 #define PPP_DEP 1955 #endif 1956 1957 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1958
Indexes created Fri Oct 03 02:09:57 GMT 2025