if_ppp.c revision 1.156
1 /* $NetBSD: if_ppp.c,v 1.156 2016/08/06 22:54:34 pgoyette 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 1.156 2016/08/06 22:54:34 pgoyette 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 { 246 247 if (ttyldisc_attach(&ppp_disc) != 0) 248 panic("%s", __func__); 249 250 mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); 251 LIST_INIT(&ppp_softc_list); 252 if_clone_attach(&ppp_cloner); 253 } 254 255 static int 256 pppdetach(void) 257 { 258 int error = 0; 259 260 if (!LIST_EMPTY(&ppp_softc_list)) 261 error = EBUSY; 262 263 if (error == 0) 264 error = ttyldisc_detach(&ppp_disc); 265 266 mutex_destroy(&ppp_list_lock); 267 268 return error; 269 } 270 271 static struct ppp_softc * 272 ppp_create(const char *name, int unit) 273 { 274 struct ppp_softc *sc, *sci, *scl = NULL; 275 276 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 277 278 mutex_enter(&ppp_list_lock); 279 if (unit == -1) { 280 int i = 0; 281 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 282 scl = sci; 283 if (i < sci->sc_unit) { 284 unit = i; 285 break; 286 } else { 287 #ifdef DIAGNOSTIC 288 KASSERT(i == sci->sc_unit); 289 #endif 290 i++; 291 } 292 } 293 if (unit == -1) 294 unit = i; 295 } else { 296 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 297 scl = sci; 298 if (unit < sci->sc_unit) 299 break; 300 else if (unit == sci->sc_unit) { 301 free(sc, M_DEVBUF); 302 return NULL; 303 } 304 } 305 } 306 307 if (sci != NULL) 308 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 309 else if (scl != NULL) 310 LIST_INSERT_AFTER(scl, sc, sc_iflist); 311 else 312 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 313 314 mutex_exit(&ppp_list_lock); 315 316 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 317 callout_init(&sc->sc_timo_ch, 0); 318 sc->sc_if.if_softc = sc; 319 sc->sc_if.if_mtu = PPP_MTU; 320 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 321 sc->sc_if.if_type = IFT_PPP; 322 sc->sc_if.if_hdrlen = PPP_HDRLEN; 323 sc->sc_if.if_dlt = DLT_NULL; 324 sc->sc_if.if_ioctl = pppsioctl; 325 sc->sc_if.if_output = pppoutput; 326 #ifdef ALTQ 327 sc->sc_if.if_start = ppp_ifstart; 328 #endif 329 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 330 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 331 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 332 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 333 /* Ratio of 1:2 packets between the regular and the fast queue */ 334 sc->sc_maxfastq = 2; 335 IFQ_SET_READY(&sc->sc_if.if_snd); 336 if_attach(&sc->sc_if); 337 if_alloc_sadl(&sc->sc_if); 338 bpf_attach(&sc->sc_if, DLT_NULL, 0); 339 return sc; 340 } 341 342 static int 343 ppp_clone_create(struct if_clone *ifc, int unit) 344 { 345 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 346 } 347 348 static int 349 ppp_clone_destroy(struct ifnet *ifp) 350 { 351 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 352 353 if (sc->sc_devp != NULL) 354 return EBUSY; /* Not removing it */ 355 356 mutex_enter(&ppp_list_lock); 357 LIST_REMOVE(sc, sc_iflist); 358 mutex_exit(&ppp_list_lock); 359 360 bpf_detach(ifp); 361 if_detach(ifp); 362 363 free(sc, M_DEVBUF); 364 return 0; 365 } 366 367 /* 368 * Allocate a ppp interface unit and initialize it. 369 */ 370 struct ppp_softc * 371 pppalloc(pid_t pid) 372 { 373 struct ppp_softc *sc = NULL, *scf; 374 int i; 375 376 mutex_enter(&ppp_list_lock); 377 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 378 if (scf->sc_xfer == pid) { 379 scf->sc_xfer = 0; 380 mutex_exit(&ppp_list_lock); 381 return scf; 382 } 383 if (scf->sc_devp == NULL && sc == NULL) 384 sc = scf; 385 } 386 mutex_exit(&ppp_list_lock); 387 388 if (sc == NULL) 389 sc = ppp_create(ppp_cloner.ifc_name, -1); 390 391 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 392 if (sc->sc_si == NULL) { 393 printf("%s: unable to establish softintr\n", 394 sc->sc_if.if_xname); 395 return (NULL); 396 } 397 sc->sc_flags = 0; 398 sc->sc_mru = PPP_MRU; 399 sc->sc_relinq = NULL; 400 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 401 #ifdef VJC 402 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 403 if (sc->sc_comp) 404 sl_compress_init(sc->sc_comp); 405 #endif 406 #ifdef PPP_COMPRESS 407 sc->sc_xc_state = NULL; 408 sc->sc_rc_state = NULL; 409 #endif /* PPP_COMPRESS */ 410 for (i = 0; i < NUM_NP; ++i) 411 sc->sc_npmode[i] = NPMODE_ERROR; 412 sc->sc_npqueue = NULL; 413 sc->sc_npqtail = &sc->sc_npqueue; 414 sc->sc_last_sent = sc->sc_last_recv = time_second; 415 416 return sc; 417 } 418 419 /* 420 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 421 */ 422 void 423 pppdealloc(struct ppp_softc *sc) 424 { 425 struct mbuf *m; 426 427 softint_disestablish(sc->sc_si); 428 if_down(&sc->sc_if); 429 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 430 sc->sc_devp = NULL; 431 sc->sc_xfer = 0; 432 for (;;) { 433 IF_DEQUEUE(&sc->sc_rawq, m); 434 if (m == NULL) 435 break; 436 m_freem(m); 437 } 438 for (;;) { 439 IF_DEQUEUE(&sc->sc_inq, m); 440 if (m == NULL) 441 break; 442 m_freem(m); 443 } 444 for (;;) { 445 IF_DEQUEUE(&sc->sc_fastq, m); 446 if (m == NULL) 447 break; 448 m_freem(m); 449 } 450 while ((m = sc->sc_npqueue) != NULL) { 451 sc->sc_npqueue = m->m_nextpkt; 452 m_freem(m); 453 } 454 if (sc->sc_togo != NULL) { 455 m_freem(sc->sc_togo); 456 sc->sc_togo = NULL; 457 } 458 #ifdef PPP_COMPRESS 459 ppp_ccp_closed(sc); 460 sc->sc_xc_state = NULL; 461 sc->sc_rc_state = NULL; 462 #endif /* PPP_COMPRESS */ 463 #ifdef PPP_FILTER 464 if (sc->sc_pass_filt_in.bf_insns != 0) { 465 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 466 sc->sc_pass_filt_in.bf_insns = 0; 467 sc->sc_pass_filt_in.bf_len = 0; 468 } 469 if (sc->sc_pass_filt_out.bf_insns != 0) { 470 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 471 sc->sc_pass_filt_out.bf_insns = 0; 472 sc->sc_pass_filt_out.bf_len = 0; 473 } 474 if (sc->sc_active_filt_in.bf_insns != 0) { 475 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 476 sc->sc_active_filt_in.bf_insns = 0; 477 sc->sc_active_filt_in.bf_len = 0; 478 } 479 if (sc->sc_active_filt_out.bf_insns != 0) { 480 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 481 sc->sc_active_filt_out.bf_insns = 0; 482 sc->sc_active_filt_out.bf_len = 0; 483 } 484 #endif /* PPP_FILTER */ 485 #ifdef VJC 486 if (sc->sc_comp != 0) { 487 free(sc->sc_comp, M_DEVBUF); 488 sc->sc_comp = 0; 489 } 490 #endif 491 (void)ppp_clone_destroy(&sc->sc_if); 492 } 493 494 /* 495 * Ioctl routine for generic ppp devices. 496 */ 497 int 498 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 499 struct lwp *l) 500 { 501 int s, error, flags, mru, npx; 502 u_int nb; 503 struct ppp_option_data *odp; 504 struct compressor *cp; 505 struct npioctl *npi; 506 time_t t; 507 #ifdef PPP_FILTER 508 struct bpf_program *bp, *nbp; 509 struct bpf_insn *newcode, *oldcode; 510 int newcodelen; 511 #endif /* PPP_FILTER */ 512 #ifdef PPP_COMPRESS 513 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 514 #endif 515 516 switch (cmd) { 517 case PPPIOCSFLAGS: 518 case PPPIOCSMRU: 519 case PPPIOCSMAXCID: 520 case PPPIOCSCOMPRESS: 521 case PPPIOCSNPMODE: 522 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 523 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 524 KAUTH_ARG(cmd), NULL) != 0) 525 return (EPERM); 526 break; 527 case PPPIOCXFERUNIT: 528 /* XXX: Why is this privileged?! */ 529 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 530 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 531 KAUTH_ARG(cmd), NULL) != 0) 532 return (EPERM); 533 break; 534 default: 535 break; 536 } 537 538 switch (cmd) { 539 case FIONREAD: 540 *(int *)data = sc->sc_inq.ifq_len; 541 break; 542 543 case PPPIOCGUNIT: 544 *(int *)data = sc->sc_unit; 545 break; 546 547 case PPPIOCGFLAGS: 548 *(u_int *)data = sc->sc_flags; 549 break; 550 551 case PPPIOCGRAWIN: 552 { 553 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 554 u_char c, q = 0; 555 556 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 557 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 558 559 for (c = 0; c < sc->sc_rawin_start;) 560 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 561 562 rwin->count = sc->sc_rawin.count; 563 } 564 break; 565 566 case PPPIOCSFLAGS: 567 flags = *(int *)data & SC_MASK; 568 s = splsoftnet(); 569 #ifdef PPP_COMPRESS 570 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 571 ppp_ccp_closed(sc); 572 #endif 573 splhigh(); /* XXX IMP ME HARDER */ 574 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 575 splx(s); 576 break; 577 578 case PPPIOCSMRU: 579 mru = *(int *)data; 580 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 581 sc->sc_mru = mru; 582 break; 583 584 case PPPIOCGMRU: 585 *(int *)data = sc->sc_mru; 586 break; 587 588 #ifdef VJC 589 case PPPIOCSMAXCID: 590 if (sc->sc_comp) { 591 s = splsoftnet(); 592 sl_compress_setup(sc->sc_comp, *(int *)data); 593 splx(s); 594 } 595 break; 596 #endif 597 598 case PPPIOCXFERUNIT: 599 sc->sc_xfer = l->l_proc->p_pid; 600 break; 601 602 #ifdef PPP_COMPRESS 603 case PPPIOCSCOMPRESS: 604 odp = (struct ppp_option_data *) data; 605 nb = odp->length; 606 if (nb > sizeof(ccp_option)) 607 nb = sizeof(ccp_option); 608 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 609 return (error); 610 /* preliminary check on the length byte */ 611 if (ccp_option[1] < 2) 612 return (EINVAL); 613 cp = ppp_get_compressor(ccp_option[0]); 614 if (cp == NULL) { 615 if (sc->sc_flags & SC_DEBUG) 616 printf("%s: no compressor for [%x %x %x], %x\n", 617 sc->sc_if.if_xname, ccp_option[0], 618 ccp_option[1], ccp_option[2], nb); 619 return (EINVAL); /* no handler found */ 620 } 621 /* 622 * Found a handler for the protocol - try to allocate 623 * a compressor or decompressor. 624 */ 625 error = 0; 626 if (odp->transmit) { 627 s = splsoftnet(); 628 if (sc->sc_xc_state != NULL) { 629 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 630 ppp_compressor_rele(sc->sc_xcomp); 631 } 632 sc->sc_xcomp = cp; 633 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 634 if (sc->sc_xc_state == NULL) { 635 if (sc->sc_flags & SC_DEBUG) 636 printf("%s: comp_alloc failed\n", 637 sc->sc_if.if_xname); 638 error = ENOBUFS; 639 } 640 splhigh(); /* XXX IMP ME HARDER */ 641 sc->sc_flags &= ~SC_COMP_RUN; 642 splx(s); 643 } else { 644 s = splsoftnet(); 645 if (sc->sc_rc_state != NULL) { 646 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 647 ppp_compressor_rele(sc->sc_rcomp); 648 } 649 sc->sc_rcomp = cp; 650 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 651 if (sc->sc_rc_state == NULL) { 652 if (sc->sc_flags & SC_DEBUG) 653 printf("%s: decomp_alloc failed\n", 654 sc->sc_if.if_xname); 655 error = ENOBUFS; 656 } 657 splhigh(); /* XXX IMP ME HARDER */ 658 sc->sc_flags &= ~SC_DECOMP_RUN; 659 splx(s); 660 } 661 return (error); 662 #endif /* PPP_COMPRESS */ 663 664 case PPPIOCGNPMODE: 665 case PPPIOCSNPMODE: 666 npi = (struct npioctl *) data; 667 switch (npi->protocol) { 668 case PPP_IP: 669 npx = NP_IP; 670 break; 671 case PPP_IPV6: 672 npx = NP_IPV6; 673 break; 674 default: 675 return EINVAL; 676 } 677 if (cmd == PPPIOCGNPMODE) { 678 npi->mode = sc->sc_npmode[npx]; 679 } else { 680 if (npi->mode != sc->sc_npmode[npx]) { 681 s = splnet(); 682 sc->sc_npmode[npx] = npi->mode; 683 if (npi->mode != NPMODE_QUEUE) { 684 ppp_requeue(sc); 685 ppp_restart(sc); 686 } 687 splx(s); 688 } 689 } 690 break; 691 692 case PPPIOCGIDLE: 693 s = splsoftnet(); 694 t = time_second; 695 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 696 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 697 splx(s); 698 break; 699 700 #ifdef PPP_FILTER 701 case PPPIOCSPASS: 702 case PPPIOCSACTIVE: 703 /* These are no longer supported. */ 704 return EOPNOTSUPP; 705 706 case PPPIOCSIPASS: 707 case PPPIOCSOPASS: 708 case PPPIOCSIACTIVE: 709 case PPPIOCSOACTIVE: 710 nbp = (struct bpf_program *) data; 711 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 712 return EINVAL; 713 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 714 if (newcodelen != 0) { 715 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 716 /* WAITOK -- malloc() never fails. */ 717 if ((error = copyin((void *)nbp->bf_insns, 718 (void *)newcode, newcodelen)) != 0) { 719 free(newcode, M_DEVBUF); 720 return error; 721 } 722 if (!bpf_validate(newcode, nbp->bf_len)) { 723 free(newcode, M_DEVBUF); 724 return EINVAL; 725 } 726 } else 727 newcode = 0; 728 switch (cmd) { 729 case PPPIOCSIPASS: 730 bp = &sc->sc_pass_filt_in; 731 break; 732 733 case PPPIOCSOPASS: 734 bp = &sc->sc_pass_filt_out; 735 break; 736 737 case PPPIOCSIACTIVE: 738 bp = &sc->sc_active_filt_in; 739 break; 740 741 case PPPIOCSOACTIVE: 742 bp = &sc->sc_active_filt_out; 743 break; 744 default: 745 free(newcode, M_DEVBUF); 746 return (EPASSTHROUGH); 747 } 748 oldcode = bp->bf_insns; 749 s = splnet(); 750 bp->bf_len = nbp->bf_len; 751 bp->bf_insns = newcode; 752 splx(s); 753 if (oldcode != 0) 754 free(oldcode, M_DEVBUF); 755 break; 756 #endif /* PPP_FILTER */ 757 758 default: 759 return (EPASSTHROUGH); 760 } 761 return (0); 762 } 763 764 /* 765 * Process an ioctl request to the ppp network interface. 766 */ 767 static int 768 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 769 { 770 struct ppp_softc *sc = ifp->if_softc; 771 struct ifaddr *ifa = (struct ifaddr *)data; 772 struct ifreq *ifr = (struct ifreq *)data; 773 struct ppp_stats *psp; 774 #ifdef PPP_COMPRESS 775 struct ppp_comp_stats *pcp; 776 #endif 777 int s = splnet(), error = 0; 778 779 switch (cmd) { 780 case SIOCSIFFLAGS: 781 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 782 break; 783 if ((ifp->if_flags & IFF_RUNNING) == 0) 784 ifp->if_flags &= ~IFF_UP; 785 break; 786 787 case SIOCINITIFADDR: 788 switch (ifa->ifa_addr->sa_family) { 789 #ifdef INET 790 case AF_INET: 791 break; 792 #endif 793 #ifdef INET6 794 case AF_INET6: 795 break; 796 #endif 797 default: 798 error = EAFNOSUPPORT; 799 break; 800 } 801 ifa->ifa_rtrequest = p2p_rtrequest; 802 break; 803 804 case SIOCADDMULTI: 805 case SIOCDELMULTI: 806 if (ifr == NULL) { 807 error = EAFNOSUPPORT; 808 break; 809 } 810 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 811 #ifdef INET 812 case AF_INET: 813 break; 814 #endif 815 #ifdef INET6 816 case AF_INET6: 817 break; 818 #endif 819 default: 820 error = EAFNOSUPPORT; 821 break; 822 } 823 break; 824 825 case SIOCGPPPSTATS: 826 psp = &((struct ifpppstatsreq *) data)->stats; 827 memset(psp, 0, sizeof(*psp)); 828 psp->p = sc->sc_stats; 829 #if defined(VJC) && !defined(SL_NO_STATS) 830 if (sc->sc_comp) { 831 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 832 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 833 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 834 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 835 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 836 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 837 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 838 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 839 } 840 #endif /* VJC */ 841 break; 842 843 #ifdef PPP_COMPRESS 844 case SIOCGPPPCSTATS: 845 pcp = &((struct ifpppcstatsreq *) data)->stats; 846 memset(pcp, 0, sizeof(*pcp)); 847 if (sc->sc_xc_state != NULL) 848 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 849 if (sc->sc_rc_state != NULL) 850 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 851 break; 852 #endif /* PPP_COMPRESS */ 853 854 default: 855 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 856 error = 0; 857 break; 858 } 859 splx(s); 860 return (error); 861 } 862 863 /* 864 * Queue a packet. Start transmission if not active. 865 * Packet is placed in Information field of PPP frame. 866 */ 867 int 868 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 869 const struct rtentry *rtp) 870 { 871 struct ppp_softc *sc = ifp->if_softc; 872 int protocol, address, control; 873 u_char *cp; 874 int s, error; 875 #ifdef INET 876 struct ip *ip; 877 #endif 878 struct ifqueue *ifq; 879 enum NPmode mode; 880 int len; 881 882 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 883 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 884 error = ENETDOWN; /* sort of */ 885 goto bad; 886 } 887 888 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 889 890 /* 891 * Compute PPP header. 892 */ 893 m0->m_flags &= ~M_HIGHPRI; 894 switch (dst->sa_family) { 895 #ifdef INET 896 case AF_INET: 897 address = PPP_ALLSTATIONS; 898 control = PPP_UI; 899 protocol = PPP_IP; 900 mode = sc->sc_npmode[NP_IP]; 901 902 /* 903 * If this packet has the "low delay" bit set in the IP header, 904 * put it on the fastq instead. 905 */ 906 ip = mtod(m0, struct ip *); 907 if (ip->ip_tos & IPTOS_LOWDELAY) 908 m0->m_flags |= M_HIGHPRI; 909 break; 910 #endif 911 #ifdef INET6 912 case AF_INET6: 913 address = PPP_ALLSTATIONS; /*XXX*/ 914 control = PPP_UI; /*XXX*/ 915 protocol = PPP_IPV6; 916 mode = sc->sc_npmode[NP_IPV6]; 917 918 #if 0 /* XXX flowinfo/traffic class, maybe? */ 919 /* 920 * If this packet has the "low delay" bit set in the IP header, 921 * put it on the fastq instead. 922 */ 923 ip = mtod(m0, struct ip *); 924 if (ip->ip_tos & IPTOS_LOWDELAY) 925 m0->m_flags |= M_HIGHPRI; 926 #endif 927 break; 928 #endif 929 case AF_UNSPEC: 930 address = PPP_ADDRESS(dst->sa_data); 931 control = PPP_CONTROL(dst->sa_data); 932 protocol = PPP_PROTOCOL(dst->sa_data); 933 mode = NPMODE_PASS; 934 break; 935 default: 936 printf("%s: af%d not supported\n", ifp->if_xname, 937 dst->sa_family); 938 error = EAFNOSUPPORT; 939 goto bad; 940 } 941 942 /* 943 * Drop this packet, or return an error, if necessary. 944 */ 945 if (mode == NPMODE_ERROR) { 946 error = ENETDOWN; 947 goto bad; 948 } 949 if (mode == NPMODE_DROP) { 950 error = 0; 951 goto bad; 952 } 953 954 /* 955 * Add PPP header. 956 */ 957 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 958 if (m0 == NULL) { 959 error = ENOBUFS; 960 goto bad; 961 } 962 963 cp = mtod(m0, u_char *); 964 *cp++ = address; 965 *cp++ = control; 966 *cp++ = protocol >> 8; 967 *cp++ = protocol & 0xff; 968 969 len = m_length(m0); 970 971 if (sc->sc_flags & SC_LOG_OUTPKT) { 972 printf("%s output: ", ifp->if_xname); 973 pppdumpm(m0); 974 } 975 976 if ((protocol & 0x8000) == 0) { 977 #ifdef PPP_FILTER 978 /* 979 * Apply the pass and active filters to the packet, 980 * but only if it is a data packet. 981 */ 982 if (sc->sc_pass_filt_out.bf_insns != 0 983 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 984 (u_char *)m0, len, 0) == 0) { 985 error = 0; /* drop this packet */ 986 goto bad; 987 } 988 989 /* 990 * Update the time we sent the most recent packet. 991 */ 992 if (sc->sc_active_filt_out.bf_insns == 0 993 || bpf_filter(sc->sc_active_filt_out.bf_insns, 994 (u_char *)m0, len, 0)) 995 sc->sc_last_sent = time_second; 996 #else 997 /* 998 * Update the time we sent the most recent packet. 999 */ 1000 sc->sc_last_sent = time_second; 1001 #endif /* PPP_FILTER */ 1002 } 1003 1004 /* 1005 * See if bpf wants to look at the packet. 1006 */ 1007 bpf_mtap(&sc->sc_if, m0); 1008 1009 /* 1010 * Put the packet on the appropriate queue. 1011 */ 1012 s = splnet(); 1013 if (mode == NPMODE_QUEUE) { 1014 /* XXX we should limit the number of packets on this queue */ 1015 *sc->sc_npqtail = m0; 1016 m0->m_nextpkt = NULL; 1017 sc->sc_npqtail = &m0->m_nextpkt; 1018 } else { 1019 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1020 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1021 splx(s); 1022 sc->sc_if.if_oerrors++; 1023 sc->sc_stats.ppp_oerrors++; 1024 return (error); 1025 } 1026 ppp_restart(sc); 1027 } 1028 ifp->if_opackets++; 1029 ifp->if_obytes += len; 1030 1031 splx(s); 1032 return (0); 1033 1034 bad: 1035 m_freem(m0); 1036 return (error); 1037 } 1038 1039 /* 1040 * After a change in the NPmode for some NP, move packets from the 1041 * npqueue to the send queue or the fast queue as appropriate. 1042 * Should be called at splnet, since we muck with the queues. 1043 */ 1044 static void 1045 ppp_requeue(struct ppp_softc *sc) 1046 { 1047 struct mbuf *m, **mpp; 1048 struct ifqueue *ifq; 1049 enum NPmode mode; 1050 int error; 1051 1052 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1053 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1054 case PPP_IP: 1055 mode = sc->sc_npmode[NP_IP]; 1056 break; 1057 case PPP_IPV6: 1058 mode = sc->sc_npmode[NP_IPV6]; 1059 break; 1060 default: 1061 mode = NPMODE_PASS; 1062 } 1063 1064 switch (mode) { 1065 case NPMODE_PASS: 1066 /* 1067 * This packet can now go on one of the queues to 1068 * be sent. 1069 */ 1070 *mpp = m->m_nextpkt; 1071 m->m_nextpkt = NULL; 1072 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1073 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1074 sc->sc_if.if_oerrors++; 1075 sc->sc_stats.ppp_oerrors++; 1076 } 1077 break; 1078 1079 case NPMODE_DROP: 1080 case NPMODE_ERROR: 1081 *mpp = m->m_nextpkt; 1082 m_freem(m); 1083 break; 1084 1085 case NPMODE_QUEUE: 1086 mpp = &m->m_nextpkt; 1087 break; 1088 } 1089 } 1090 sc->sc_npqtail = mpp; 1091 } 1092 1093 /* 1094 * Transmitter has finished outputting some stuff; 1095 * remember to call sc->sc_start later at splsoftnet. 1096 */ 1097 void 1098 ppp_restart(struct ppp_softc *sc) 1099 { 1100 int s = splhigh(); /* XXX IMP ME HARDER */ 1101 1102 sc->sc_flags &= ~SC_TBUSY; 1103 softint_schedule(sc->sc_si); 1104 splx(s); 1105 } 1106 1107 /* 1108 * Get a packet to send. This procedure is intended to be called at 1109 * splsoftnet, since it may involve time-consuming operations such as 1110 * applying VJ compression, packet compression, address/control and/or 1111 * protocol field compression to the packet. 1112 */ 1113 struct mbuf * 1114 ppp_dequeue(struct ppp_softc *sc) 1115 { 1116 struct mbuf *m, *mp; 1117 u_char *cp; 1118 int address, control, protocol; 1119 int s; 1120 1121 /* 1122 * Grab a packet to send: first try the fast queue, then the 1123 * normal queue. 1124 */ 1125 s = splnet(); 1126 if (sc->sc_nfastq < sc->sc_maxfastq) { 1127 IF_DEQUEUE(&sc->sc_fastq, m); 1128 if (m != NULL) 1129 sc->sc_nfastq++; 1130 else 1131 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1132 } else { 1133 sc->sc_nfastq = 0; 1134 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1135 if (m == NULL) { 1136 IF_DEQUEUE(&sc->sc_fastq, m); 1137 if (m != NULL) 1138 sc->sc_nfastq++; 1139 } 1140 } 1141 splx(s); 1142 1143 if (m == NULL) 1144 return NULL; 1145 1146 ++sc->sc_stats.ppp_opackets; 1147 1148 /* 1149 * Extract the ppp header of the new packet. 1150 * The ppp header will be in one mbuf. 1151 */ 1152 cp = mtod(m, u_char *); 1153 address = PPP_ADDRESS(cp); 1154 control = PPP_CONTROL(cp); 1155 protocol = PPP_PROTOCOL(cp); 1156 1157 switch (protocol) { 1158 case PPP_IP: 1159 #ifdef VJC 1160 /* 1161 * If the packet is a TCP/IP packet, see if we can compress it. 1162 */ 1163 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1164 struct ip *ip; 1165 int type; 1166 1167 mp = m; 1168 ip = (struct ip *) (cp + PPP_HDRLEN); 1169 if (mp->m_len <= PPP_HDRLEN) { 1170 mp = mp->m_next; 1171 if (mp == NULL) 1172 break; 1173 ip = mtod(mp, struct ip *); 1174 } 1175 /* 1176 * This code assumes the IP/TCP header is in one 1177 * non-shared mbuf 1178 */ 1179 if (ip->ip_p == IPPROTO_TCP) { 1180 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1181 !(sc->sc_flags & SC_NO_TCP_CCID)); 1182 switch (type) { 1183 case TYPE_UNCOMPRESSED_TCP: 1184 protocol = PPP_VJC_UNCOMP; 1185 break; 1186 case TYPE_COMPRESSED_TCP: 1187 protocol = PPP_VJC_COMP; 1188 cp = mtod(m, u_char *); 1189 cp[0] = address; /* Header has moved */ 1190 cp[1] = control; 1191 cp[2] = 0; 1192 break; 1193 } 1194 /* Update protocol in PPP header */ 1195 cp[3] = protocol; 1196 } 1197 } 1198 #endif /* VJC */ 1199 break; 1200 1201 #ifdef PPP_COMPRESS 1202 case PPP_CCP: 1203 ppp_ccp(sc, m, 0); 1204 break; 1205 #endif /* PPP_COMPRESS */ 1206 } 1207 1208 #ifdef PPP_COMPRESS 1209 if (protocol != PPP_LCP && protocol != PPP_CCP 1210 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1211 struct mbuf *mcomp = NULL; 1212 int slen; 1213 1214 slen = 0; 1215 for (mp = m; mp != NULL; mp = mp->m_next) 1216 slen += mp->m_len; 1217 (*sc->sc_xcomp->compress) 1218 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1219 if (mcomp != NULL) { 1220 if (sc->sc_flags & SC_CCP_UP) { 1221 /* 1222 * Send the compressed packet instead of the 1223 * original. 1224 */ 1225 m_freem(m); 1226 m = mcomp; 1227 cp = mtod(m, u_char *); 1228 protocol = cp[3]; 1229 } else { 1230 /* 1231 * Can't transmit compressed packets until CCP 1232 * is up. 1233 */ 1234 m_freem(mcomp); 1235 } 1236 } 1237 } 1238 #endif /* PPP_COMPRESS */ 1239 1240 /* 1241 * Compress the address/control and protocol, if possible. 1242 */ 1243 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1244 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1245 protocol != PPP_LCP) { 1246 /* can compress address/control */ 1247 m->m_data += 2; 1248 m->m_len -= 2; 1249 } 1250 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1251 /* can compress protocol */ 1252 if (mtod(m, u_char *) == cp) { 1253 cp[2] = cp[1]; /* move address/control up */ 1254 cp[1] = cp[0]; 1255 } 1256 ++m->m_data; 1257 --m->m_len; 1258 } 1259 1260 return m; 1261 } 1262 1263 /* 1264 * Software interrupt routine, called at splsoftnet. 1265 */ 1266 static void 1267 pppintr(void *arg) 1268 { 1269 struct ppp_softc *sc = arg; 1270 struct mbuf *m; 1271 int s; 1272 1273 mutex_enter(softnet_lock); 1274 if (!(sc->sc_flags & SC_TBUSY) 1275 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1276 || sc->sc_outm)) { 1277 s = splhigh(); /* XXX IMP ME HARDER */ 1278 sc->sc_flags |= SC_TBUSY; 1279 splx(s); 1280 (*sc->sc_start)(sc); 1281 } 1282 for (;;) { 1283 s = splnet(); 1284 IF_DEQUEUE(&sc->sc_rawq, m); 1285 splx(s); 1286 if (m == NULL) 1287 break; 1288 ppp_inproc(sc, m); 1289 } 1290 mutex_exit(softnet_lock); 1291 } 1292 1293 #ifdef PPP_COMPRESS 1294 /* 1295 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1296 * 0 if it is about to be transmitted. 1297 */ 1298 static void 1299 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1300 { 1301 u_char *dp, *ep; 1302 struct mbuf *mp; 1303 int slen, s; 1304 1305 /* 1306 * Get a pointer to the data after the PPP header. 1307 */ 1308 if (m->m_len <= PPP_HDRLEN) { 1309 mp = m->m_next; 1310 if (mp == NULL) 1311 return; 1312 dp = mtod(mp, u_char *); 1313 } else { 1314 mp = m; 1315 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1316 } 1317 1318 ep = mtod(mp, u_char *) + mp->m_len; 1319 if (dp + CCP_HDRLEN > ep) 1320 return; 1321 slen = CCP_LENGTH(dp); 1322 if (dp + slen > ep) { 1323 if (sc->sc_flags & SC_DEBUG) 1324 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1325 dp, slen, mtod(mp, u_char *), mp->m_len); 1326 return; 1327 } 1328 1329 switch (CCP_CODE(dp)) { 1330 case CCP_CONFREQ: 1331 case CCP_TERMREQ: 1332 case CCP_TERMACK: 1333 /* CCP must be going down - disable compression */ 1334 if (sc->sc_flags & SC_CCP_UP) { 1335 s = splhigh(); /* XXX IMP ME HARDER */ 1336 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1337 splx(s); 1338 } 1339 break; 1340 1341 case CCP_CONFACK: 1342 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1343 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1344 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1345 if (!rcvd) { 1346 /* We're agreeing to send compressed packets. */ 1347 if (sc->sc_xc_state != NULL 1348 && (*sc->sc_xcomp->comp_init) 1349 (sc->sc_xc_state, dp + CCP_HDRLEN, 1350 slen - CCP_HDRLEN, sc->sc_unit, 0, 1351 sc->sc_flags & SC_DEBUG)) { 1352 s = splhigh(); /* XXX IMP ME HARDER */ 1353 sc->sc_flags |= SC_COMP_RUN; 1354 splx(s); 1355 } 1356 } else { 1357 /* 1358 * Peer is agreeing to send compressed 1359 * packets. 1360 */ 1361 if (sc->sc_rc_state != NULL 1362 && (*sc->sc_rcomp->decomp_init) 1363 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1364 sc->sc_unit, 0, sc->sc_mru, 1365 sc->sc_flags & SC_DEBUG)) { 1366 s = splhigh(); /* XXX IMP ME HARDER */ 1367 sc->sc_flags |= SC_DECOMP_RUN; 1368 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1369 splx(s); 1370 } 1371 } 1372 } 1373 break; 1374 1375 case CCP_RESETACK: 1376 if (sc->sc_flags & SC_CCP_UP) { 1377 if (!rcvd) { 1378 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1379 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1380 } else { 1381 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1382 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1383 s = splhigh(); /* XXX IMP ME HARDER */ 1384 sc->sc_flags &= ~SC_DC_ERROR; 1385 splx(s); 1386 } 1387 } 1388 } 1389 break; 1390 } 1391 } 1392 1393 /* 1394 * CCP is down; free (de)compressor state if necessary. 1395 */ 1396 static void 1397 ppp_ccp_closed(struct ppp_softc *sc) 1398 { 1399 if (sc->sc_xc_state) { 1400 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1401 ppp_compressor_rele(sc->sc_xcomp); 1402 sc->sc_xc_state = NULL; 1403 } 1404 if (sc->sc_rc_state) { 1405 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1406 ppp_compressor_rele(sc->sc_rcomp); 1407 sc->sc_rc_state = NULL; 1408 } 1409 } 1410 #endif /* PPP_COMPRESS */ 1411 1412 /* 1413 * PPP packet input routine. 1414 * The caller has checked and removed the FCS and has inserted 1415 * the address/control bytes and the protocol high byte if they 1416 * were omitted. 1417 */ 1418 void 1419 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1420 { 1421 int s = splhigh(); /* XXX IMP ME HARDER */ 1422 1423 if (lost) 1424 m->m_flags |= M_ERRMARK; 1425 IF_ENQUEUE(&sc->sc_rawq, m); 1426 softint_schedule(sc->sc_si); 1427 splx(s); 1428 } 1429 1430 /* 1431 * Process a received PPP packet, doing decompression as necessary. 1432 * Should be called at splsoftnet. 1433 */ 1434 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1435 TYPE_UNCOMPRESSED_TCP) 1436 1437 static void 1438 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1439 { 1440 struct ifnet *ifp = &sc->sc_if; 1441 pktqueue_t *pktq = NULL; 1442 struct ifqueue *inq = NULL; 1443 int s, ilen, proto, rv; 1444 u_char *cp, adrs, ctrl; 1445 struct mbuf *mp, *dmp = NULL; 1446 #ifdef VJC 1447 int xlen; 1448 u_char *iphdr; 1449 u_int hlen; 1450 #endif 1451 1452 sc->sc_stats.ppp_ipackets++; 1453 1454 if (sc->sc_flags & SC_LOG_INPKT) { 1455 ilen = 0; 1456 for (mp = m; mp != NULL; mp = mp->m_next) 1457 ilen += mp->m_len; 1458 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1459 pppdumpm(m); 1460 } 1461 1462 cp = mtod(m, u_char *); 1463 adrs = PPP_ADDRESS(cp); 1464 ctrl = PPP_CONTROL(cp); 1465 proto = PPP_PROTOCOL(cp); 1466 1467 if (m->m_flags & M_ERRMARK) { 1468 m->m_flags &= ~M_ERRMARK; 1469 s = splhigh(); /* XXX IMP ME HARDER */ 1470 sc->sc_flags |= SC_VJ_RESET; 1471 splx(s); 1472 } 1473 1474 #ifdef PPP_COMPRESS 1475 /* 1476 * Decompress this packet if necessary, update the receiver's 1477 * dictionary, or take appropriate action on a CCP packet. 1478 */ 1479 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1480 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1481 /* Decompress this packet */ 1482 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1483 if (rv == DECOMP_OK) { 1484 m_freem(m); 1485 if (dmp == NULL) { 1486 /* 1487 * No error, but no decompressed packet 1488 * produced 1489 */ 1490 return; 1491 } 1492 m = dmp; 1493 cp = mtod(m, u_char *); 1494 proto = PPP_PROTOCOL(cp); 1495 1496 } else { 1497 /* 1498 * An error has occurred in decompression. 1499 * Pass the compressed packet up to pppd, which may 1500 * take CCP down or issue a Reset-Req. 1501 */ 1502 if (sc->sc_flags & SC_DEBUG) 1503 printf("%s: decompress failed %d\n", 1504 ifp->if_xname, rv); 1505 s = splhigh(); /* XXX IMP ME HARDER */ 1506 sc->sc_flags |= SC_VJ_RESET; 1507 if (rv == DECOMP_ERROR) 1508 sc->sc_flags |= SC_DC_ERROR; 1509 else 1510 sc->sc_flags |= SC_DC_FERROR; 1511 splx(s); 1512 } 1513 1514 } else { 1515 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1516 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1517 if (proto == PPP_CCP) 1518 ppp_ccp(sc, m, 1); 1519 } 1520 #endif 1521 1522 ilen = 0; 1523 for (mp = m; mp != NULL; mp = mp->m_next) 1524 ilen += mp->m_len; 1525 1526 #ifdef VJC 1527 if (sc->sc_flags & SC_VJ_RESET) { 1528 /* 1529 * If we've missed a packet, we must toss subsequent compressed 1530 * packets which don't have an explicit connection ID. 1531 */ 1532 if (sc->sc_comp) 1533 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1534 s = splhigh(); /* XXX IMP ME HARDER */ 1535 sc->sc_flags &= ~SC_VJ_RESET; 1536 splx(s); 1537 } 1538 1539 /* 1540 * See if we have a VJ-compressed packet to uncompress. 1541 */ 1542 if (proto == PPP_VJC_COMP) { 1543 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1544 goto bad; 1545 1546 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1547 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1548 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1549 1550 if (xlen <= 0) { 1551 if (sc->sc_flags & SC_DEBUG) 1552 printf("%s: VJ uncompress failed on type comp\n", 1553 ifp->if_xname); 1554 goto bad; 1555 } 1556 1557 /* Copy the PPP and IP headers into a new mbuf. */ 1558 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1559 if (mp == NULL) 1560 goto bad; 1561 mp->m_len = 0; 1562 mp->m_next = NULL; 1563 if (hlen + PPP_HDRLEN > MHLEN) { 1564 MCLGET(mp, M_DONTWAIT); 1565 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1566 /* Lose if big headers and no clusters */ 1567 m_freem(mp); 1568 goto bad; 1569 } 1570 } 1571 cp = mtod(mp, u_char *); 1572 cp[0] = adrs; 1573 cp[1] = ctrl; 1574 cp[2] = 0; 1575 cp[3] = PPP_IP; 1576 proto = PPP_IP; 1577 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1578 mp->m_len = hlen + PPP_HDRLEN; 1579 1580 /* 1581 * Trim the PPP and VJ headers off the old mbuf 1582 * and stick the new and old mbufs together. 1583 */ 1584 m->m_data += PPP_HDRLEN + xlen; 1585 m->m_len -= PPP_HDRLEN + xlen; 1586 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1587 bcopy(mtod(m, u_char *), 1588 mtod(mp, u_char *) + mp->m_len, m->m_len); 1589 mp->m_len += m->m_len; 1590 MFREE(m, mp->m_next); 1591 } else 1592 mp->m_next = m; 1593 m = mp; 1594 ilen += hlen - xlen; 1595 1596 } else if (proto == PPP_VJC_UNCOMP) { 1597 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1598 goto bad; 1599 1600 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1601 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1602 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1603 1604 if (xlen < 0) { 1605 if (sc->sc_flags & SC_DEBUG) 1606 printf("%s: VJ uncompress failed on type uncomp\n", 1607 ifp->if_xname); 1608 goto bad; 1609 } 1610 1611 proto = PPP_IP; 1612 cp[3] = PPP_IP; 1613 } 1614 #endif /* VJC */ 1615 1616 /* 1617 * If the packet will fit in a header mbuf, don't waste a 1618 * whole cluster on it. 1619 */ 1620 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1621 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1622 if (mp != NULL) { 1623 m_copydata(m, 0, ilen, mtod(mp, void *)); 1624 m_freem(m); 1625 m = mp; 1626 m->m_len = ilen; 1627 } 1628 } 1629 m->m_pkthdr.len = ilen; 1630 m_set_rcvif(m, ifp); 1631 1632 if ((proto & 0x8000) == 0) { 1633 #ifdef PPP_FILTER 1634 /* 1635 * See whether we want to pass this packet, and 1636 * if it counts as link activity. 1637 */ 1638 if (sc->sc_pass_filt_in.bf_insns != 0 1639 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1640 (u_char *)m, ilen, 0) == 0) { 1641 /* drop this packet */ 1642 m_freem(m); 1643 return; 1644 } 1645 if (sc->sc_active_filt_in.bf_insns == 0 1646 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1647 (u_char *)m, ilen, 0)) 1648 sc->sc_last_recv = time_second; 1649 #else 1650 /* 1651 * Record the time that we received this packet. 1652 */ 1653 sc->sc_last_recv = time_second; 1654 #endif /* PPP_FILTER */ 1655 } 1656 1657 /* See if bpf wants to look at the packet. */ 1658 bpf_mtap(&sc->sc_if, m); 1659 1660 switch (proto) { 1661 #ifdef INET 1662 case PPP_IP: 1663 /* 1664 * IP packet - take off the ppp header and pass it up to IP. 1665 */ 1666 if ((ifp->if_flags & IFF_UP) == 0 1667 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1668 /* Interface is down - drop the packet. */ 1669 m_freem(m); 1670 return; 1671 } 1672 m->m_pkthdr.len -= PPP_HDRLEN; 1673 m->m_data += PPP_HDRLEN; 1674 m->m_len -= PPP_HDRLEN; 1675 #ifdef GATEWAY 1676 if (ipflow_fastforward(m)) 1677 return; 1678 #endif 1679 pktq = ip_pktq; 1680 break; 1681 #endif 1682 1683 #ifdef INET6 1684 case PPP_IPV6: 1685 /* 1686 * IPv6 packet - take off the ppp header and pass it up to 1687 * IPv6. 1688 */ 1689 if ((ifp->if_flags & IFF_UP) == 0 1690 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1691 /* interface is down - drop the packet. */ 1692 m_freem(m); 1693 return; 1694 } 1695 m->m_pkthdr.len -= PPP_HDRLEN; 1696 m->m_data += PPP_HDRLEN; 1697 m->m_len -= PPP_HDRLEN; 1698 #ifdef GATEWAY 1699 if (ip6flow_fastforward(&m)) 1700 return; 1701 #endif 1702 pktq = ip6_pktq; 1703 break; 1704 #endif 1705 1706 default: 1707 /* 1708 * Some other protocol - place on input queue for read(). 1709 */ 1710 inq = &sc->sc_inq; 1711 pktq = NULL; 1712 break; 1713 } 1714 1715 /* 1716 * Put the packet on the appropriate input queue. 1717 */ 1718 s = splnet(); 1719 1720 /* pktq: inet or inet6 cases */ 1721 if (__predict_true(pktq)) { 1722 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1723 ifp->if_iqdrops++; 1724 goto bad; 1725 } 1726 ifp->if_ipackets++; 1727 ifp->if_ibytes += ilen; 1728 splx(s); 1729 return; 1730 } 1731 1732 /* ifq: other protocol cases */ 1733 if (!inq) { 1734 goto bad; 1735 } 1736 if (IF_QFULL(inq)) { 1737 IF_DROP(inq); 1738 splx(s); 1739 if (sc->sc_flags & SC_DEBUG) 1740 printf("%s: input queue full\n", ifp->if_xname); 1741 ifp->if_iqdrops++; 1742 goto bad; 1743 } 1744 IF_ENQUEUE(inq, m); 1745 splx(s); 1746 ifp->if_ipackets++; 1747 ifp->if_ibytes += ilen; 1748 1749 (*sc->sc_ctlp)(sc); 1750 1751 return; 1752 1753 bad: 1754 m_freem(m); 1755 sc->sc_if.if_ierrors++; 1756 sc->sc_stats.ppp_ierrors++; 1757 } 1758 1759 #define MAX_DUMP_BYTES 128 1760 1761 static void 1762 pppdumpm(struct mbuf *m0) 1763 { 1764 char buf[3*MAX_DUMP_BYTES+4]; 1765 char *bp = buf; 1766 struct mbuf *m; 1767 1768 for (m = m0; m; m = m->m_next) { 1769 int l = m->m_len; 1770 u_char *rptr = (u_char *)m->m_data; 1771 1772 while (l--) { 1773 if (bp > buf + sizeof(buf) - 4) 1774 goto done; 1775 /* Convert byte to ascii hex */ 1776 *bp++ = hexdigits[*rptr >> 4]; 1777 *bp++ = hexdigits[*rptr++ & 0xf]; 1778 } 1779 1780 if (m->m_next) { 1781 if (bp > buf + sizeof(buf) - 3) 1782 goto done; 1783 *bp++ = '|'; 1784 } else 1785 *bp++ = ' '; 1786 } 1787 done: 1788 if (m) 1789 *bp++ = '>'; 1790 *bp = 0; 1791 printf("%s\n", buf); 1792 } 1793 1794 #ifdef ALTQ 1795 /* 1796 * A wrapper to transmit a packet from if_start since ALTQ uses 1797 * if_start to send a packet. 1798 */ 1799 static void 1800 ppp_ifstart(struct ifnet *ifp) 1801 { 1802 struct ppp_softc *sc; 1803 1804 sc = ifp->if_softc; 1805 (*sc->sc_start)(sc); 1806 } 1807 #endif 1808 1809 static const struct ppp_known_compressor { 1810 uint8_t code; 1811 const char *module; 1812 } ppp_known_compressors[] = { 1813 { CI_DEFLATE, "ppp_deflate" }, 1814 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1815 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1816 { CI_MPPE, "ppp_mppe" }, 1817 { 0, NULL } 1818 }; 1819 1820 static int 1821 ppp_compressor_init(void) 1822 { 1823 1824 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1825 return 0; 1826 } 1827 1828 static int 1829 ppp_compressor_destroy(void) 1830 { 1831 1832 mutex_destroy(&ppp_compressors_mtx); 1833 return 0; 1834 } 1835 1836 static void 1837 ppp_compressor_rele(struct compressor *cp) 1838 { 1839 1840 mutex_enter(&ppp_compressors_mtx); 1841 --cp->comp_refcnt; 1842 mutex_exit(&ppp_compressors_mtx); 1843 } 1844 1845 static struct compressor * 1846 ppp_get_compressor_noload(uint8_t ci, bool hold) 1847 { 1848 struct compressor *cp; 1849 1850 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1851 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1852 if (cp->compress_proto == ci) { 1853 if (hold) 1854 ++cp->comp_refcnt; 1855 return cp; 1856 } 1857 } 1858 1859 return NULL; 1860 } 1861 1862 static struct compressor * 1863 ppp_get_compressor(uint8_t ci) 1864 { 1865 struct compressor *cp = NULL; 1866 const struct ppp_known_compressor *pkc; 1867 1868 mutex_enter(&ppp_compressors_mtx); 1869 cp = ppp_get_compressor_noload(ci, true); 1870 mutex_exit(&ppp_compressors_mtx); 1871 if (cp != NULL) 1872 return cp; 1873 1874 kernconfig_lock(); 1875 mutex_enter(&ppp_compressors_mtx); 1876 cp = ppp_get_compressor_noload(ci, true); 1877 mutex_exit(&ppp_compressors_mtx); 1878 if (cp == NULL) { 1879 /* Not found, so try to autoload a module */ 1880 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1881 if (pkc->code == ci) { 1882 if (module_autoload(pkc->module, 1883 MODULE_CLASS_MISC) != 0) 1884 break; 1885 mutex_enter(&ppp_compressors_mtx); 1886 cp = ppp_get_compressor_noload(ci, true); 1887 mutex_exit(&ppp_compressors_mtx); 1888 break; 1889 } 1890 } 1891 } 1892 kernconfig_unlock(); 1893 1894 return cp; 1895 } 1896 1897 int 1898 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1899 { 1900 int error = 0; 1901 size_t i; 1902 1903 mutex_enter(&ppp_compressors_mtx); 1904 for (i = 0; i < ncomp; i++) { 1905 if (ppp_get_compressor_noload(pc[i].compress_proto, 1906 false) != NULL) 1907 error = EEXIST; 1908 } 1909 if (!error) { 1910 for (i = 0; i < ncomp; i++) { 1911 pc[i].comp_refcnt = 0; 1912 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1913 } 1914 } 1915 mutex_exit(&ppp_compressors_mtx); 1916 1917 return error; 1918 } 1919 1920 int 1921 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1922 { 1923 int error = 0; 1924 size_t i; 1925 1926 mutex_enter(&ppp_compressors_mtx); 1927 for (i = 0; i < ncomp; i++) { 1928 if (ppp_get_compressor_noload(pc[i].compress_proto, 1929 false) != &pc[i]) 1930 error = ENOENT; 1931 else if (pc[i].comp_refcnt != 0) 1932 error = EBUSY; 1933 } 1934 if (!error) { 1935 for (i = 0; i < ncomp; i++) { 1936 LIST_REMOVE(&pc[i], comp_list); 1937 } 1938 } 1939 mutex_exit(&ppp_compressors_mtx); 1940 1941 return error; 1942 } 1943 1944 /* 1945 * Module infrastructure 1946 */ 1947 1948 #ifdef PPP_FILTER 1949 #define PPP_DEP "bpf_filter," 1950 #else 1951 #define PPP_DEP 1952 #endif 1953 1954 MODULE(MODULE_CLASS_DRIVER, if_ppp, PPP_DEP "slcompress"); 1955 1956 #ifdef _MODULE 1957 CFDRIVER_DECL(ppp, DV_IFNET, NULL); 1958 #endif 1959 1960 static int 1961 if_ppp_modcmd(modcmd_t cmd, void *arg) 1962 { 1963 int error = 0; 1964 1965 switch (cmd) { 1966 case MODULE_CMD_INIT: 1967 /* Init the compressor sub-sub-system */ 1968 ppp_compressor_init(); 1969 1970 #ifdef _MODULE 1971 error = config_cfdriver_attach(&ppp_cd); 1972 if (error) { 1973 aprint_error("%s: unable to register cfdriver for" 1974 "%s, error %d\n", __func__, ppp_cd.cd_name, error); 1975 ppp_compressor_destroy(); 1976 break; 1977 } 1978 1979 #endif 1980 /* Init the unit list and line discipline stuff */ 1981 pppinit(); 1982 break; 1983 1984 case MODULE_CMD_FINI: 1985 /* 1986 * Make sure it's ok to detach - no units left, and 1987 * line discipline is removed 1988 */ 1989 error = pppdetach(); 1990 if (error != 0) 1991 break; 1992 #ifdef _MODULE 1993 /* Remove device from autoconf database */ 1994 error = config_cfdriver_detach(&ppp_cd); 1995 if (error) { 1996 aprint_error("%s: failed to detach %s cfdriver, " 1997 "error %d\n", __func__, ppp_cd.cd_name, error); 1998 break; 1999 } 2000 #endif 2001 ppp_compressor_destroy(); 2002 break; 2003 2004 case MODULE_CMD_STAT: 2005 error = ENOTTY; 2006 break; 2007 default: 2008 error = ENOTTY; 2009 break; 2010 } 2011 2012 return error; 2013 } 2014
Indexes created Wed Sep 24 05:09:52 GMT 2025