if_ppp.c revision 1.159.2.3
1 /* $NetBSD: if_ppp.c,v 1.159.2.3 2019/01/18 08:50:58 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 1.159.2.3 2019/01/18 08:50:58 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> 142 143 #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 mutex_exit(&ppp_list_lock); 305 return NULL; 306 } 307 } 308 } 309 310 if (sci != NULL) 311 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 312 else if (scl != NULL) 313 LIST_INSERT_AFTER(scl, sc, sc_iflist); 314 else 315 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 316 317 mutex_exit(&ppp_list_lock); 318 319 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 320 callout_init(&sc->sc_timo_ch, 0); 321 sc->sc_if.if_softc = sc; 322 sc->sc_if.if_mtu = PPP_MTU; 323 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 324 sc->sc_if.if_type = IFT_PPP; 325 sc->sc_if.if_hdrlen = PPP_HDRLEN; 326 sc->sc_if.if_dlt = DLT_NULL; 327 sc->sc_if.if_ioctl = pppsioctl; 328 sc->sc_if.if_output = pppoutput; 329 #ifdef ALTQ 330 sc->sc_if.if_start = ppp_ifstart; 331 #endif 332 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 333 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 334 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 335 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 336 /* Ratio of 1:2 packets between the regular and the fast queue */ 337 sc->sc_maxfastq = 2; 338 IFQ_SET_READY(&sc->sc_if.if_snd); 339 if_attach(&sc->sc_if); 340 if_alloc_sadl(&sc->sc_if); 341 bpf_attach(&sc->sc_if, DLT_NULL, 0); 342 return sc; 343 } 344 345 static int 346 ppp_clone_create(struct if_clone *ifc, int unit) 347 { 348 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 349 } 350 351 static int 352 ppp_clone_destroy(struct ifnet *ifp) 353 { 354 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 355 356 if (sc->sc_devp != NULL) 357 return EBUSY; /* Not removing it */ 358 359 mutex_enter(&ppp_list_lock); 360 LIST_REMOVE(sc, sc_iflist); 361 mutex_exit(&ppp_list_lock); 362 363 bpf_detach(ifp); 364 if_detach(ifp); 365 366 free(sc, M_DEVBUF); 367 return 0; 368 } 369 370 /* 371 * Allocate a ppp interface unit and initialize it. 372 */ 373 struct ppp_softc * 374 pppalloc(pid_t pid) 375 { 376 struct ppp_softc *sc = NULL, *scf; 377 int i; 378 379 mutex_enter(&ppp_list_lock); 380 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 381 if (scf->sc_xfer == pid) { 382 scf->sc_xfer = 0; 383 mutex_exit(&ppp_list_lock); 384 return scf; 385 } 386 if (scf->sc_devp == NULL && sc == NULL) 387 sc = scf; 388 } 389 mutex_exit(&ppp_list_lock); 390 391 if (sc == NULL) 392 sc = ppp_create(ppp_cloner.ifc_name, -1); 393 394 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 395 if (sc->sc_si == NULL) { 396 printf("%s: unable to establish softintr\n", 397 sc->sc_if.if_xname); 398 return (NULL); 399 } 400 sc->sc_flags = 0; 401 sc->sc_mru = PPP_MRU; 402 sc->sc_relinq = NULL; 403 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 404 #ifdef VJC 405 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 406 if (sc->sc_comp) 407 sl_compress_init(sc->sc_comp); 408 #endif 409 #ifdef PPP_COMPRESS 410 sc->sc_xc_state = NULL; 411 sc->sc_rc_state = NULL; 412 #endif /* PPP_COMPRESS */ 413 for (i = 0; i < NUM_NP; ++i) 414 sc->sc_npmode[i] = NPMODE_ERROR; 415 sc->sc_npqueue = NULL; 416 sc->sc_npqtail = &sc->sc_npqueue; 417 sc->sc_last_sent = sc->sc_last_recv = time_second; 418 419 return sc; 420 } 421 422 /* 423 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 424 */ 425 void 426 pppdealloc(struct ppp_softc *sc) 427 { 428 struct mbuf *m; 429 430 softint_disestablish(sc->sc_si); 431 if_down(&sc->sc_if); 432 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 433 sc->sc_devp = NULL; 434 sc->sc_xfer = 0; 435 for (;;) { 436 IF_DEQUEUE(&sc->sc_rawq, m); 437 if (m == NULL) 438 break; 439 m_freem(m); 440 } 441 for (;;) { 442 IF_DEQUEUE(&sc->sc_inq, m); 443 if (m == NULL) 444 break; 445 m_freem(m); 446 } 447 for (;;) { 448 IF_DEQUEUE(&sc->sc_fastq, m); 449 if (m == NULL) 450 break; 451 m_freem(m); 452 } 453 while ((m = sc->sc_npqueue) != NULL) { 454 sc->sc_npqueue = m->m_nextpkt; 455 m_freem(m); 456 } 457 if (sc->sc_togo != NULL) { 458 m_freem(sc->sc_togo); 459 sc->sc_togo = NULL; 460 } 461 #ifdef PPP_COMPRESS 462 ppp_ccp_closed(sc); 463 sc->sc_xc_state = NULL; 464 sc->sc_rc_state = NULL; 465 #endif /* PPP_COMPRESS */ 466 #ifdef PPP_FILTER 467 if (sc->sc_pass_filt_in.bf_insns != 0) { 468 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 469 sc->sc_pass_filt_in.bf_insns = 0; 470 sc->sc_pass_filt_in.bf_len = 0; 471 } 472 if (sc->sc_pass_filt_out.bf_insns != 0) { 473 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 474 sc->sc_pass_filt_out.bf_insns = 0; 475 sc->sc_pass_filt_out.bf_len = 0; 476 } 477 if (sc->sc_active_filt_in.bf_insns != 0) { 478 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 479 sc->sc_active_filt_in.bf_insns = 0; 480 sc->sc_active_filt_in.bf_len = 0; 481 } 482 if (sc->sc_active_filt_out.bf_insns != 0) { 483 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 484 sc->sc_active_filt_out.bf_insns = 0; 485 sc->sc_active_filt_out.bf_len = 0; 486 } 487 #endif /* PPP_FILTER */ 488 #ifdef VJC 489 if (sc->sc_comp != 0) { 490 free(sc->sc_comp, M_DEVBUF); 491 sc->sc_comp = 0; 492 } 493 #endif 494 (void)ppp_clone_destroy(&sc->sc_if); 495 } 496 497 /* 498 * Ioctl routine for generic ppp devices. 499 */ 500 int 501 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 502 struct lwp *l) 503 { 504 int s, error, flags, mru, npx; 505 u_int nb; 506 struct ppp_option_data *odp; 507 struct compressor *cp; 508 struct npioctl *npi; 509 time_t t; 510 #ifdef PPP_FILTER 511 struct bpf_program *bp, *nbp; 512 struct bpf_insn *newcode, *oldcode; 513 int newcodelen; 514 #endif /* PPP_FILTER */ 515 #ifdef PPP_COMPRESS 516 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 517 #endif 518 519 switch (cmd) { 520 case PPPIOCSFLAGS: 521 case PPPIOCSMRU: 522 case PPPIOCSMAXCID: 523 case PPPIOCSCOMPRESS: 524 case PPPIOCSNPMODE: 525 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 526 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 527 KAUTH_ARG(cmd), NULL) != 0) 528 return (EPERM); 529 break; 530 case PPPIOCXFERUNIT: 531 /* XXX: Why is this privileged?! */ 532 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 533 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 534 KAUTH_ARG(cmd), NULL) != 0) 535 return (EPERM); 536 break; 537 default: 538 break; 539 } 540 541 switch (cmd) { 542 case FIONREAD: 543 *(int *)data = sc->sc_inq.ifq_len; 544 break; 545 546 case PPPIOCGUNIT: 547 *(int *)data = sc->sc_unit; 548 break; 549 550 case PPPIOCGFLAGS: 551 *(u_int *)data = sc->sc_flags; 552 break; 553 554 case PPPIOCGRAWIN: 555 { 556 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 557 u_char c, q = 0; 558 559 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 560 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 561 562 for (c = 0; c < sc->sc_rawin_start;) 563 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 564 565 rwin->count = sc->sc_rawin.count; 566 } 567 break; 568 569 case PPPIOCSFLAGS: 570 flags = *(int *)data & SC_MASK; 571 s = splsoftnet(); 572 #ifdef PPP_COMPRESS 573 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 574 ppp_ccp_closed(sc); 575 #endif 576 splhigh(); /* XXX IMP ME HARDER */ 577 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 578 splx(s); 579 break; 580 581 case PPPIOCSMRU: 582 mru = *(int *)data; 583 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 584 sc->sc_mru = mru; 585 break; 586 587 case PPPIOCGMRU: 588 *(int *)data = sc->sc_mru; 589 break; 590 591 #ifdef VJC 592 case PPPIOCSMAXCID: 593 if (sc->sc_comp) { 594 s = splsoftnet(); 595 sl_compress_setup(sc->sc_comp, *(int *)data); 596 splx(s); 597 } 598 break; 599 #endif 600 601 case PPPIOCXFERUNIT: 602 sc->sc_xfer = l->l_proc->p_pid; 603 break; 604 605 #ifdef PPP_COMPRESS 606 case PPPIOCSCOMPRESS: 607 odp = (struct ppp_option_data *) data; 608 nb = odp->length; 609 if (nb > sizeof(ccp_option)) 610 nb = sizeof(ccp_option); 611 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 612 return (error); 613 /* preliminary check on the length byte */ 614 if (ccp_option[1] < 2) 615 return (EINVAL); 616 cp = ppp_get_compressor(ccp_option[0]); 617 if (cp == NULL) { 618 if (sc->sc_flags & SC_DEBUG) 619 printf("%s: no compressor for [%x %x %x], %x\n", 620 sc->sc_if.if_xname, ccp_option[0], 621 ccp_option[1], ccp_option[2], nb); 622 return (EINVAL); /* no handler found */ 623 } 624 /* 625 * Found a handler for the protocol - try to allocate 626 * a compressor or decompressor. 627 */ 628 error = 0; 629 if (odp->transmit) { 630 s = splsoftnet(); 631 if (sc->sc_xc_state != NULL) { 632 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 633 ppp_compressor_rele(sc->sc_xcomp); 634 } 635 sc->sc_xcomp = cp; 636 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 637 if (sc->sc_xc_state == NULL) { 638 if (sc->sc_flags & SC_DEBUG) 639 printf("%s: comp_alloc failed\n", 640 sc->sc_if.if_xname); 641 error = ENOBUFS; 642 } 643 splhigh(); /* XXX IMP ME HARDER */ 644 sc->sc_flags &= ~SC_COMP_RUN; 645 splx(s); 646 } else { 647 s = splsoftnet(); 648 if (sc->sc_rc_state != NULL) { 649 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 650 ppp_compressor_rele(sc->sc_rcomp); 651 } 652 sc->sc_rcomp = cp; 653 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 654 if (sc->sc_rc_state == NULL) { 655 if (sc->sc_flags & SC_DEBUG) 656 printf("%s: decomp_alloc failed\n", 657 sc->sc_if.if_xname); 658 error = ENOBUFS; 659 } 660 splhigh(); /* XXX IMP ME HARDER */ 661 sc->sc_flags &= ~SC_DECOMP_RUN; 662 splx(s); 663 } 664 return (error); 665 #endif /* PPP_COMPRESS */ 666 667 case PPPIOCGNPMODE: 668 case PPPIOCSNPMODE: 669 npi = (struct npioctl *) data; 670 switch (npi->protocol) { 671 case PPP_IP: 672 npx = NP_IP; 673 break; 674 case PPP_IPV6: 675 npx = NP_IPV6; 676 break; 677 default: 678 return EINVAL; 679 } 680 if (cmd == PPPIOCGNPMODE) { 681 npi->mode = sc->sc_npmode[npx]; 682 } else { 683 if (npi->mode != sc->sc_npmode[npx]) { 684 s = splnet(); 685 sc->sc_npmode[npx] = npi->mode; 686 if (npi->mode != NPMODE_QUEUE) { 687 ppp_requeue(sc); 688 ppp_restart(sc); 689 } 690 splx(s); 691 } 692 } 693 break; 694 695 case PPPIOCGIDLE: 696 s = splsoftnet(); 697 t = time_second; 698 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 699 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 700 splx(s); 701 break; 702 703 #ifdef PPP_FILTER 704 case PPPIOCSPASS: 705 case PPPIOCSACTIVE: 706 /* These are no longer supported. */ 707 return EOPNOTSUPP; 708 709 case PPPIOCSIPASS: 710 case PPPIOCSOPASS: 711 case PPPIOCSIACTIVE: 712 case PPPIOCSOACTIVE: 713 nbp = (struct bpf_program *) data; 714 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 715 return EINVAL; 716 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 717 if (newcodelen != 0) { 718 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 719 /* WAITOK -- malloc() never fails. */ 720 if ((error = copyin((void *)nbp->bf_insns, 721 (void *)newcode, newcodelen)) != 0) { 722 free(newcode, M_DEVBUF); 723 return error; 724 } 725 if (!bpf_validate(newcode, nbp->bf_len)) { 726 free(newcode, M_DEVBUF); 727 return EINVAL; 728 } 729 } else 730 newcode = 0; 731 switch (cmd) { 732 case PPPIOCSIPASS: 733 bp = &sc->sc_pass_filt_in; 734 break; 735 736 case PPPIOCSOPASS: 737 bp = &sc->sc_pass_filt_out; 738 break; 739 740 case PPPIOCSIACTIVE: 741 bp = &sc->sc_active_filt_in; 742 break; 743 744 case PPPIOCSOACTIVE: 745 bp = &sc->sc_active_filt_out; 746 break; 747 default: 748 free(newcode, M_DEVBUF); 749 return (EPASSTHROUGH); 750 } 751 oldcode = bp->bf_insns; 752 s = splnet(); 753 bp->bf_len = nbp->bf_len; 754 bp->bf_insns = newcode; 755 splx(s); 756 if (oldcode != 0) 757 free(oldcode, M_DEVBUF); 758 break; 759 #endif /* PPP_FILTER */ 760 761 default: 762 return (EPASSTHROUGH); 763 } 764 return (0); 765 } 766 767 /* 768 * Process an ioctl request to the ppp network interface. 769 */ 770 static int 771 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 772 { 773 struct ppp_softc *sc = ifp->if_softc; 774 struct ifaddr *ifa = (struct ifaddr *)data; 775 struct ifreq *ifr = (struct ifreq *)data; 776 struct ppp_stats *psp; 777 #ifdef PPP_COMPRESS 778 struct ppp_comp_stats *pcp; 779 #endif 780 int s = splnet(), error = 0; 781 782 switch (cmd) { 783 case SIOCSIFFLAGS: 784 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 785 break; 786 if ((ifp->if_flags & IFF_RUNNING) == 0) 787 ifp->if_flags &= ~IFF_UP; 788 break; 789 790 case SIOCINITIFADDR: 791 switch (ifa->ifa_addr->sa_family) { 792 #ifdef INET 793 case AF_INET: 794 break; 795 #endif 796 #ifdef INET6 797 case AF_INET6: 798 break; 799 #endif 800 default: 801 printf("%s: af%d not supported\n", ifp->if_xname, 802 ifa->ifa_addr->sa_family); 803 error = EAFNOSUPPORT; 804 break; 805 } 806 ifa->ifa_rtrequest = p2p_rtrequest; 807 break; 808 809 case SIOCADDMULTI: 810 case SIOCDELMULTI: 811 if (ifr == NULL) { 812 error = EAFNOSUPPORT; 813 break; 814 } 815 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 816 #ifdef INET 817 case AF_INET: 818 break; 819 #endif 820 #ifdef INET6 821 case AF_INET6: 822 break; 823 #endif 824 default: 825 error = EAFNOSUPPORT; 826 break; 827 } 828 break; 829 830 case SIOCGPPPSTATS: 831 psp = &((struct ifpppstatsreq *) data)->stats; 832 memset(psp, 0, sizeof(*psp)); 833 psp->p = sc->sc_stats; 834 #if defined(VJC) && !defined(SL_NO_STATS) 835 if (sc->sc_comp) { 836 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 837 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 838 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 839 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 840 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 841 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 842 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 843 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 844 } 845 #endif /* VJC */ 846 break; 847 848 #ifdef PPP_COMPRESS 849 case SIOCGPPPCSTATS: 850 pcp = &((struct ifpppcstatsreq *) data)->stats; 851 memset(pcp, 0, sizeof(*pcp)); 852 if (sc->sc_xc_state != NULL) 853 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 854 if (sc->sc_rc_state != NULL) 855 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 856 break; 857 #endif /* PPP_COMPRESS */ 858 859 default: 860 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 861 error = 0; 862 break; 863 } 864 splx(s); 865 return (error); 866 } 867 868 /* 869 * Queue a packet. Start transmission if not active. 870 * Packet is placed in Information field of PPP frame. 871 */ 872 int 873 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 874 const struct rtentry *rtp) 875 { 876 struct ppp_softc *sc = ifp->if_softc; 877 int protocol, address, control; 878 u_char *cp; 879 int s, error; 880 #ifdef INET 881 struct ip *ip; 882 #endif 883 struct ifqueue *ifq; 884 enum NPmode mode; 885 int len; 886 887 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 888 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 889 error = ENETDOWN; /* sort of */ 890 goto bad; 891 } 892 893 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); 894 895 /* 896 * Compute PPP header. 897 */ 898 m0->m_flags &= ~M_HIGHPRI; 899 switch (dst->sa_family) { 900 #ifdef INET 901 case AF_INET: 902 address = PPP_ALLSTATIONS; 903 control = PPP_UI; 904 protocol = PPP_IP; 905 mode = sc->sc_npmode[NP_IP]; 906 907 /* 908 * If this packet has the "low delay" bit set in the IP header, 909 * put it on the fastq instead. 910 */ 911 ip = mtod(m0, struct ip *); 912 if (ip->ip_tos & IPTOS_LOWDELAY) 913 m0->m_flags |= M_HIGHPRI; 914 break; 915 #endif 916 #ifdef INET6 917 case AF_INET6: 918 address = PPP_ALLSTATIONS; /*XXX*/ 919 control = PPP_UI; /*XXX*/ 920 protocol = PPP_IPV6; 921 mode = sc->sc_npmode[NP_IPV6]; 922 923 #if 0 /* XXX flowinfo/traffic class, maybe? */ 924 /* 925 * If this packet has the "low delay" bit set in the IP header, 926 * put it on the fastq instead. 927 */ 928 ip = mtod(m0, struct ip *); 929 if (ip->ip_tos & IPTOS_LOWDELAY) 930 m0->m_flags |= M_HIGHPRI; 931 #endif 932 break; 933 #endif 934 case AF_UNSPEC: 935 address = PPP_ADDRESS(dst->sa_data); 936 control = PPP_CONTROL(dst->sa_data); 937 protocol = PPP_PROTOCOL(dst->sa_data); 938 mode = NPMODE_PASS; 939 break; 940 default: 941 printf("%s: af%d not supported\n", ifp->if_xname, 942 dst->sa_family); 943 error = EAFNOSUPPORT; 944 goto bad; 945 } 946 947 /* 948 * Drop this packet, or return an error, if necessary. 949 */ 950 if (mode == NPMODE_ERROR) { 951 error = ENETDOWN; 952 goto bad; 953 } 954 if (mode == NPMODE_DROP) { 955 error = 0; 956 goto bad; 957 } 958 959 /* 960 * Add PPP header. 961 */ 962 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 963 if (m0 == NULL) { 964 error = ENOBUFS; 965 goto bad; 966 } 967 968 cp = mtod(m0, u_char *); 969 *cp++ = address; 970 *cp++ = control; 971 *cp++ = protocol >> 8; 972 *cp++ = protocol & 0xff; 973 974 len = m_length(m0); 975 976 if (sc->sc_flags & SC_LOG_OUTPKT) { 977 printf("%s output: ", ifp->if_xname); 978 pppdumpm(m0); 979 } 980 981 if ((protocol & 0x8000) == 0) { 982 #ifdef PPP_FILTER 983 /* 984 * Apply the pass and active filters to the packet, 985 * but only if it is a data packet. 986 */ 987 if (sc->sc_pass_filt_out.bf_insns != 0 988 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 989 (u_char *)m0, len, 0) == 0) { 990 error = 0; /* drop this packet */ 991 goto bad; 992 } 993 994 /* 995 * Update the time we sent the most recent packet. 996 */ 997 if (sc->sc_active_filt_out.bf_insns == 0 998 || bpf_filter(sc->sc_active_filt_out.bf_insns, 999 (u_char *)m0, len, 0)) 1000 sc->sc_last_sent = time_second; 1001 #else 1002 /* 1003 * Update the time we sent the most recent packet. 1004 */ 1005 sc->sc_last_sent = time_second; 1006 #endif /* PPP_FILTER */ 1007 } 1008 1009 /* 1010 * See if bpf wants to look at the packet. 1011 */ 1012 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT); 1013 1014 /* 1015 * Put the packet on the appropriate queue. 1016 */ 1017 s = splnet(); 1018 if (mode == NPMODE_QUEUE) { 1019 /* XXX we should limit the number of packets on this queue */ 1020 *sc->sc_npqtail = m0; 1021 m0->m_nextpkt = NULL; 1022 sc->sc_npqtail = &m0->m_nextpkt; 1023 } else { 1024 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1025 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) { 1026 splx(s); 1027 sc->sc_if.if_oerrors++; 1028 sc->sc_stats.ppp_oerrors++; 1029 return (error); 1030 } 1031 ppp_restart(sc); 1032 } 1033 ifp->if_opackets++; 1034 ifp->if_obytes += len; 1035 1036 splx(s); 1037 return (0); 1038 1039 bad: 1040 m_freem(m0); 1041 return (error); 1042 } 1043 1044 /* 1045 * After a change in the NPmode for some NP, move packets from the 1046 * npqueue to the send queue or the fast queue as appropriate. 1047 * Should be called at splnet, since we muck with the queues. 1048 */ 1049 static void 1050 ppp_requeue(struct ppp_softc *sc) 1051 { 1052 struct mbuf *m, **mpp; 1053 struct ifqueue *ifq; 1054 enum NPmode mode; 1055 int error; 1056 1057 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1058 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1059 case PPP_IP: 1060 mode = sc->sc_npmode[NP_IP]; 1061 break; 1062 case PPP_IPV6: 1063 mode = sc->sc_npmode[NP_IPV6]; 1064 break; 1065 default: 1066 mode = NPMODE_PASS; 1067 } 1068 1069 switch (mode) { 1070 case NPMODE_PASS: 1071 /* 1072 * This packet can now go on one of the queues to 1073 * be sent. 1074 */ 1075 *mpp = m->m_nextpkt; 1076 m->m_nextpkt = NULL; 1077 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1078 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) { 1079 sc->sc_if.if_oerrors++; 1080 sc->sc_stats.ppp_oerrors++; 1081 } 1082 break; 1083 1084 case NPMODE_DROP: 1085 case NPMODE_ERROR: 1086 *mpp = m->m_nextpkt; 1087 m_freem(m); 1088 break; 1089 1090 case NPMODE_QUEUE: 1091 mpp = &m->m_nextpkt; 1092 break; 1093 } 1094 } 1095 sc->sc_npqtail = mpp; 1096 } 1097 1098 /* 1099 * Transmitter has finished outputting some stuff; 1100 * remember to call sc->sc_start later at splsoftnet. 1101 */ 1102 void 1103 ppp_restart(struct ppp_softc *sc) 1104 { 1105 int s = splhigh(); /* XXX IMP ME HARDER */ 1106 1107 sc->sc_flags &= ~SC_TBUSY; 1108 softint_schedule(sc->sc_si); 1109 splx(s); 1110 } 1111 1112 /* 1113 * Get a packet to send. This procedure is intended to be called at 1114 * splsoftnet, since it may involve time-consuming operations such as 1115 * applying VJ compression, packet compression, address/control and/or 1116 * protocol field compression to the packet. 1117 */ 1118 struct mbuf * 1119 ppp_dequeue(struct ppp_softc *sc) 1120 { 1121 struct mbuf *m, *mp; 1122 u_char *cp; 1123 int address, control, protocol; 1124 int s; 1125 1126 /* 1127 * Grab a packet to send: first try the fast queue, then the 1128 * normal queue. 1129 */ 1130 s = splnet(); 1131 if (sc->sc_nfastq < sc->sc_maxfastq) { 1132 IF_DEQUEUE(&sc->sc_fastq, m); 1133 if (m != NULL) 1134 sc->sc_nfastq++; 1135 else 1136 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1137 } else { 1138 sc->sc_nfastq = 0; 1139 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1140 if (m == NULL) { 1141 IF_DEQUEUE(&sc->sc_fastq, m); 1142 if (m != NULL) 1143 sc->sc_nfastq++; 1144 } 1145 } 1146 splx(s); 1147 1148 if (m == NULL) 1149 return NULL; 1150 1151 ++sc->sc_stats.ppp_opackets; 1152 1153 /* 1154 * Extract the ppp header of the new packet. 1155 * The ppp header will be in one mbuf. 1156 */ 1157 cp = mtod(m, u_char *); 1158 address = PPP_ADDRESS(cp); 1159 control = PPP_CONTROL(cp); 1160 protocol = PPP_PROTOCOL(cp); 1161 1162 switch (protocol) { 1163 case PPP_IP: 1164 #ifdef VJC 1165 /* 1166 * If the packet is a TCP/IP packet, see if we can compress it. 1167 */ 1168 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1169 struct ip *ip; 1170 int type; 1171 1172 mp = m; 1173 ip = (struct ip *) (cp + PPP_HDRLEN); 1174 if (mp->m_len <= PPP_HDRLEN) { 1175 mp = mp->m_next; 1176 if (mp == NULL) 1177 break; 1178 ip = mtod(mp, struct ip *); 1179 } 1180 /* 1181 * This code assumes the IP/TCP header is in one 1182 * non-shared mbuf 1183 */ 1184 if (ip->ip_p == IPPROTO_TCP) { 1185 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1186 !(sc->sc_flags & SC_NO_TCP_CCID)); 1187 switch (type) { 1188 case TYPE_UNCOMPRESSED_TCP: 1189 protocol = PPP_VJC_UNCOMP; 1190 break; 1191 case TYPE_COMPRESSED_TCP: 1192 protocol = PPP_VJC_COMP; 1193 cp = mtod(m, u_char *); 1194 cp[0] = address; /* Header has moved */ 1195 cp[1] = control; 1196 cp[2] = 0; 1197 break; 1198 } 1199 /* Update protocol in PPP header */ 1200 cp[3] = protocol; 1201 } 1202 } 1203 #endif /* VJC */ 1204 break; 1205 1206 #ifdef PPP_COMPRESS 1207 case PPP_CCP: 1208 ppp_ccp(sc, m, 0); 1209 break; 1210 #endif /* PPP_COMPRESS */ 1211 } 1212 1213 #ifdef PPP_COMPRESS 1214 if (protocol != PPP_LCP && protocol != PPP_CCP 1215 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1216 struct mbuf *mcomp = NULL; 1217 int slen; 1218 1219 slen = 0; 1220 for (mp = m; mp != NULL; mp = mp->m_next) 1221 slen += mp->m_len; 1222 (*sc->sc_xcomp->compress) 1223 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1224 if (mcomp != NULL) { 1225 if (sc->sc_flags & SC_CCP_UP) { 1226 /* 1227 * Send the compressed packet instead of the 1228 * original. 1229 */ 1230 m_freem(m); 1231 m = mcomp; 1232 cp = mtod(m, u_char *); 1233 protocol = cp[3]; 1234 } else { 1235 /* 1236 * Can't transmit compressed packets until CCP 1237 * is up. 1238 */ 1239 m_freem(mcomp); 1240 } 1241 } 1242 } 1243 #endif /* PPP_COMPRESS */ 1244 1245 /* 1246 * Compress the address/control and protocol, if possible. 1247 */ 1248 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1249 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1250 protocol != PPP_LCP) { 1251 /* can compress address/control */ 1252 m->m_data += 2; 1253 m->m_len -= 2; 1254 } 1255 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1256 /* can compress protocol */ 1257 if (mtod(m, u_char *) == cp) { 1258 cp[2] = cp[1]; /* move address/control up */ 1259 cp[1] = cp[0]; 1260 } 1261 ++m->m_data; 1262 --m->m_len; 1263 } 1264 1265 return m; 1266 } 1267 1268 /* 1269 * Software interrupt routine, called at splsoftnet. 1270 */ 1271 static void 1272 pppintr(void *arg) 1273 { 1274 struct ppp_softc *sc = arg; 1275 struct mbuf *m; 1276 int s; 1277 1278 mutex_enter(softnet_lock); 1279 if (!(sc->sc_flags & SC_TBUSY) 1280 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1281 || sc->sc_outm)) { 1282 s = splhigh(); /* XXX IMP ME HARDER */ 1283 sc->sc_flags |= SC_TBUSY; 1284 splx(s); 1285 (*sc->sc_start)(sc); 1286 } 1287 for (;;) { 1288 s = splnet(); 1289 IF_DEQUEUE(&sc->sc_rawq, m); 1290 splx(s); 1291 if (m == NULL) 1292 break; 1293 ppp_inproc(sc, m); 1294 } 1295 mutex_exit(softnet_lock); 1296 } 1297 1298 #ifdef PPP_COMPRESS 1299 /* 1300 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1301 * 0 if it is about to be transmitted. 1302 */ 1303 static void 1304 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1305 { 1306 u_char *dp, *ep; 1307 struct mbuf *mp; 1308 int slen, s; 1309 1310 /* 1311 * Get a pointer to the data after the PPP header. 1312 */ 1313 if (m->m_len <= PPP_HDRLEN) { 1314 mp = m->m_next; 1315 if (mp == NULL) 1316 return; 1317 dp = mtod(mp, u_char *); 1318 } else { 1319 mp = m; 1320 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1321 } 1322 1323 ep = mtod(mp, u_char *) + mp->m_len; 1324 if (dp + CCP_HDRLEN > ep) 1325 return; 1326 slen = CCP_LENGTH(dp); 1327 if (dp + slen > ep) { 1328 if (sc->sc_flags & SC_DEBUG) 1329 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1330 dp, slen, mtod(mp, u_char *), mp->m_len); 1331 return; 1332 } 1333 1334 switch (CCP_CODE(dp)) { 1335 case CCP_CONFREQ: 1336 case CCP_TERMREQ: 1337 case CCP_TERMACK: 1338 /* CCP must be going down - disable compression */ 1339 if (sc->sc_flags & SC_CCP_UP) { 1340 s = splhigh(); /* XXX IMP ME HARDER */ 1341 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1342 splx(s); 1343 } 1344 break; 1345 1346 case CCP_CONFACK: 1347 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1348 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1349 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1350 if (!rcvd) { 1351 /* We're agreeing to send compressed packets. */ 1352 if (sc->sc_xc_state != NULL 1353 && (*sc->sc_xcomp->comp_init) 1354 (sc->sc_xc_state, dp + CCP_HDRLEN, 1355 slen - CCP_HDRLEN, sc->sc_unit, 0, 1356 sc->sc_flags & SC_DEBUG)) { 1357 s = splhigh(); /* XXX IMP ME HARDER */ 1358 sc->sc_flags |= SC_COMP_RUN; 1359 splx(s); 1360 } 1361 } else { 1362 /* 1363 * Peer is agreeing to send compressed 1364 * packets. 1365 */ 1366 if (sc->sc_rc_state != NULL 1367 && (*sc->sc_rcomp->decomp_init) 1368 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1369 sc->sc_unit, 0, sc->sc_mru, 1370 sc->sc_flags & SC_DEBUG)) { 1371 s = splhigh(); /* XXX IMP ME HARDER */ 1372 sc->sc_flags |= SC_DECOMP_RUN; 1373 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1374 splx(s); 1375 } 1376 } 1377 } 1378 break; 1379 1380 case CCP_RESETACK: 1381 if (sc->sc_flags & SC_CCP_UP) { 1382 if (!rcvd) { 1383 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1384 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1385 } else { 1386 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1387 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1388 s = splhigh(); /* XXX IMP ME HARDER */ 1389 sc->sc_flags &= ~SC_DC_ERROR; 1390 splx(s); 1391 } 1392 } 1393 } 1394 break; 1395 } 1396 } 1397 1398 /* 1399 * CCP is down; free (de)compressor state if necessary. 1400 */ 1401 static void 1402 ppp_ccp_closed(struct ppp_softc *sc) 1403 { 1404 if (sc->sc_xc_state) { 1405 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1406 ppp_compressor_rele(sc->sc_xcomp); 1407 sc->sc_xc_state = NULL; 1408 } 1409 if (sc->sc_rc_state) { 1410 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1411 ppp_compressor_rele(sc->sc_rcomp); 1412 sc->sc_rc_state = NULL; 1413 } 1414 } 1415 #endif /* PPP_COMPRESS */ 1416 1417 /* 1418 * PPP packet input routine. 1419 * The caller has checked and removed the FCS and has inserted 1420 * the address/control bytes and the protocol high byte if they 1421 * were omitted. 1422 */ 1423 void 1424 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1425 { 1426 int s = splhigh(); /* XXX IMP ME HARDER */ 1427 1428 if (lost) 1429 m->m_flags |= M_ERRMARK; 1430 IF_ENQUEUE(&sc->sc_rawq, m); 1431 softint_schedule(sc->sc_si); 1432 splx(s); 1433 } 1434 1435 /* 1436 * Process a received PPP packet, doing decompression as necessary. 1437 * Should be called at splsoftnet. 1438 */ 1439 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1440 TYPE_UNCOMPRESSED_TCP) 1441 1442 static void 1443 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1444 { 1445 struct ifnet *ifp = &sc->sc_if; 1446 pktqueue_t *pktq = NULL; 1447 struct ifqueue *inq = NULL; 1448 int s, ilen, proto, rv; 1449 u_char *cp, adrs, ctrl; 1450 struct mbuf *mp, *dmp = NULL; 1451 #ifdef VJC 1452 int xlen; 1453 u_char *iphdr; 1454 u_int hlen; 1455 #endif 1456 1457 sc->sc_stats.ppp_ipackets++; 1458 1459 if (sc->sc_flags & SC_LOG_INPKT) { 1460 ilen = 0; 1461 for (mp = m; mp != NULL; mp = mp->m_next) 1462 ilen += mp->m_len; 1463 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1464 pppdumpm(m); 1465 } 1466 1467 cp = mtod(m, u_char *); 1468 adrs = PPP_ADDRESS(cp); 1469 ctrl = PPP_CONTROL(cp); 1470 proto = PPP_PROTOCOL(cp); 1471 1472 if (m->m_flags & M_ERRMARK) { 1473 m->m_flags &= ~M_ERRMARK; 1474 s = splhigh(); /* XXX IMP ME HARDER */ 1475 sc->sc_flags |= SC_VJ_RESET; 1476 splx(s); 1477 } 1478 1479 #ifdef PPP_COMPRESS 1480 /* 1481 * Decompress this packet if necessary, update the receiver's 1482 * dictionary, or take appropriate action on a CCP packet. 1483 */ 1484 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1485 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1486 /* Decompress this packet */ 1487 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1488 if (rv == DECOMP_OK) { 1489 m_freem(m); 1490 if (dmp == NULL) { 1491 /* 1492 * No error, but no decompressed packet 1493 * produced 1494 */ 1495 return; 1496 } 1497 m = dmp; 1498 cp = mtod(m, u_char *); 1499 proto = PPP_PROTOCOL(cp); 1500 1501 } else { 1502 /* 1503 * An error has occurred in decompression. 1504 * Pass the compressed packet up to pppd, which may 1505 * take CCP down or issue a Reset-Req. 1506 */ 1507 if (sc->sc_flags & SC_DEBUG) 1508 printf("%s: decompress failed %d\n", 1509 ifp->if_xname, rv); 1510 s = splhigh(); /* XXX IMP ME HARDER */ 1511 sc->sc_flags |= SC_VJ_RESET; 1512 if (rv == DECOMP_ERROR) 1513 sc->sc_flags |= SC_DC_ERROR; 1514 else 1515 sc->sc_flags |= SC_DC_FERROR; 1516 splx(s); 1517 } 1518 1519 } else { 1520 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1521 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1522 if (proto == PPP_CCP) 1523 ppp_ccp(sc, m, 1); 1524 } 1525 #endif 1526 1527 ilen = 0; 1528 for (mp = m; mp != NULL; mp = mp->m_next) 1529 ilen += mp->m_len; 1530 1531 #ifdef VJC 1532 if (sc->sc_flags & SC_VJ_RESET) { 1533 /* 1534 * If we've missed a packet, we must toss subsequent compressed 1535 * packets which don't have an explicit connection ID. 1536 */ 1537 if (sc->sc_comp) 1538 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1539 s = splhigh(); /* XXX IMP ME HARDER */ 1540 sc->sc_flags &= ~SC_VJ_RESET; 1541 splx(s); 1542 } 1543 1544 /* 1545 * See if we have a VJ-compressed packet to uncompress. 1546 */ 1547 if (proto == PPP_VJC_COMP) { 1548 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1549 goto bad; 1550 1551 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1552 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1553 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1554 1555 if (xlen <= 0) { 1556 if (sc->sc_flags & SC_DEBUG) 1557 printf("%s: VJ uncompress failed on type comp\n", 1558 ifp->if_xname); 1559 goto bad; 1560 } 1561 1562 /* Copy the PPP and IP headers into a new mbuf. */ 1563 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1564 if (mp == NULL) 1565 goto bad; 1566 mp->m_len = 0; 1567 mp->m_next = NULL; 1568 if (hlen + PPP_HDRLEN > MHLEN) { 1569 MCLGET(mp, M_DONTWAIT); 1570 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1571 /* Lose if big headers and no clusters */ 1572 m_freem(mp); 1573 goto bad; 1574 } 1575 } 1576 cp = mtod(mp, u_char *); 1577 cp[0] = adrs; 1578 cp[1] = ctrl; 1579 cp[2] = 0; 1580 cp[3] = PPP_IP; 1581 proto = PPP_IP; 1582 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1583 mp->m_len = hlen + PPP_HDRLEN; 1584 1585 /* 1586 * Trim the PPP and VJ headers off the old mbuf 1587 * and stick the new and old mbufs together. 1588 */ 1589 m->m_data += PPP_HDRLEN + xlen; 1590 m->m_len -= PPP_HDRLEN + xlen; 1591 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1592 bcopy(mtod(m, u_char *), 1593 mtod(mp, u_char *) + mp->m_len, m->m_len); 1594 mp->m_len += m->m_len; 1595 mp->m_next = m_free(m); 1596 } else 1597 mp->m_next = m; 1598 m = mp; 1599 ilen += hlen - xlen; 1600 1601 } else if (proto == PPP_VJC_UNCOMP) { 1602 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1603 goto bad; 1604 1605 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1606 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1607 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1608 1609 if (xlen < 0) { 1610 if (sc->sc_flags & SC_DEBUG) 1611 printf("%s: VJ uncompress failed on type uncomp\n", 1612 ifp->if_xname); 1613 goto bad; 1614 } 1615 1616 proto = PPP_IP; 1617 cp[3] = PPP_IP; 1618 } 1619 #endif /* VJC */ 1620 1621 /* 1622 * If the packet will fit in a header mbuf, don't waste a 1623 * whole cluster on it. 1624 */ 1625 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1626 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1627 if (mp != NULL) { 1628 m_copydata(m, 0, ilen, mtod(mp, void *)); 1629 m_freem(m); 1630 m = mp; 1631 m->m_len = ilen; 1632 } 1633 } 1634 m->m_pkthdr.len = ilen; 1635 m_set_rcvif(m, ifp); 1636 1637 if ((proto & 0x8000) == 0) { 1638 #ifdef PPP_FILTER 1639 /* 1640 * See whether we want to pass this packet, and 1641 * if it counts as link activity. 1642 */ 1643 if (sc->sc_pass_filt_in.bf_insns != 0 1644 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1645 (u_char *)m, ilen, 0) == 0) { 1646 /* drop this packet */ 1647 m_freem(m); 1648 return; 1649 } 1650 if (sc->sc_active_filt_in.bf_insns == 0 1651 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1652 (u_char *)m, ilen, 0)) 1653 sc->sc_last_recv = time_second; 1654 #else 1655 /* 1656 * Record the time that we received this packet. 1657 */ 1658 sc->sc_last_recv = time_second; 1659 #endif /* PPP_FILTER */ 1660 } 1661 1662 /* See if bpf wants to look at the packet. */ 1663 bpf_mtap(&sc->sc_if, m, BPF_D_IN); 1664 1665 switch (proto) { 1666 #ifdef INET 1667 case PPP_IP: 1668 /* 1669 * IP packet - take off the ppp header and pass it up to IP. 1670 */ 1671 if ((ifp->if_flags & IFF_UP) == 0 1672 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1673 /* Interface is down - drop the packet. */ 1674 m_freem(m); 1675 return; 1676 } 1677 m->m_pkthdr.len -= PPP_HDRLEN; 1678 m->m_data += PPP_HDRLEN; 1679 m->m_len -= PPP_HDRLEN; 1680 #ifdef GATEWAY 1681 if (ipflow_fastforward(m)) 1682 return; 1683 #endif 1684 pktq = ip_pktq; 1685 break; 1686 #endif 1687 1688 #ifdef INET6 1689 case PPP_IPV6: 1690 /* 1691 * IPv6 packet - take off the ppp header and pass it up to 1692 * IPv6. 1693 */ 1694 if ((ifp->if_flags & IFF_UP) == 0 1695 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1696 /* interface is down - drop the packet. */ 1697 m_freem(m); 1698 return; 1699 } 1700 m->m_pkthdr.len -= PPP_HDRLEN; 1701 m->m_data += PPP_HDRLEN; 1702 m->m_len -= PPP_HDRLEN; 1703 #ifdef GATEWAY 1704 if (ip6flow_fastforward(&m)) 1705 return; 1706 #endif 1707 pktq = ip6_pktq; 1708 break; 1709 #endif 1710 1711 default: 1712 /* 1713 * Some other protocol - place on input queue for read(). 1714 */ 1715 inq = &sc->sc_inq; 1716 pktq = NULL; 1717 break; 1718 } 1719 1720 /* 1721 * Put the packet on the appropriate input queue. 1722 */ 1723 s = splnet(); 1724 1725 /* pktq: inet or inet6 cases */ 1726 if (__predict_true(pktq)) { 1727 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1728 splx(s); 1729 ifp->if_iqdrops++; 1730 goto bad; 1731 } 1732 ifp->if_ipackets++; 1733 ifp->if_ibytes += ilen; 1734 splx(s); 1735 return; 1736 } 1737 1738 /* ifq: other protocol cases */ 1739 if (!inq) { 1740 splx(s); 1741 goto bad; 1742 } 1743 if (IF_QFULL(inq)) { 1744 IF_DROP(inq); 1745 splx(s); 1746 if (sc->sc_flags & SC_DEBUG) 1747 printf("%s: input queue full\n", ifp->if_xname); 1748 ifp->if_iqdrops++; 1749 goto bad; 1750 } 1751 IF_ENQUEUE(inq, m); 1752 splx(s); 1753 ifp->if_ipackets++; 1754 ifp->if_ibytes += ilen; 1755 1756 (*sc->sc_ctlp)(sc); 1757 1758 return; 1759 1760 bad: 1761 m_freem(m); 1762 sc->sc_if.if_ierrors++; 1763 sc->sc_stats.ppp_ierrors++; 1764 } 1765 1766 #define MAX_DUMP_BYTES 128 1767 1768 static void 1769 pppdumpm(struct mbuf *m0) 1770 { 1771 char buf[3*MAX_DUMP_BYTES+4]; 1772 char *bp = buf; 1773 struct mbuf *m; 1774 1775 for (m = m0; m; m = m->m_next) { 1776 int l = m->m_len; 1777 u_char *rptr = (u_char *)m->m_data; 1778 1779 while (l--) { 1780 if (bp > buf + sizeof(buf) - 4) 1781 goto done; 1782 /* Convert byte to ascii hex */ 1783 *bp++ = hexdigits[*rptr >> 4]; 1784 *bp++ = hexdigits[*rptr++ & 0xf]; 1785 } 1786 1787 if (m->m_next) { 1788 if (bp > buf + sizeof(buf) - 3) 1789 goto done; 1790 *bp++ = '|'; 1791 } else 1792 *bp++ = ' '; 1793 } 1794 done: 1795 if (m) 1796 *bp++ = '>'; 1797 *bp = 0; 1798 printf("%s\n", buf); 1799 } 1800 1801 #ifdef ALTQ 1802 /* 1803 * A wrapper to transmit a packet from if_start since ALTQ uses 1804 * if_start to send a packet. 1805 */ 1806 static void 1807 ppp_ifstart(struct ifnet *ifp) 1808 { 1809 struct ppp_softc *sc; 1810 1811 sc = ifp->if_softc; 1812 (*sc->sc_start)(sc); 1813 } 1814 #endif 1815 1816 static const struct ppp_known_compressor { 1817 uint8_t code; 1818 const char *module; 1819 } ppp_known_compressors[] = { 1820 { CI_DEFLATE, "ppp_deflate" }, 1821 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1822 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1823 { CI_MPPE, "ppp_mppe" }, 1824 { 0, NULL } 1825 }; 1826 1827 static int 1828 ppp_compressor_init(void) 1829 { 1830 1831 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1832 return 0; 1833 } 1834 1835 static int 1836 ppp_compressor_destroy(void) 1837 { 1838 1839 mutex_destroy(&ppp_compressors_mtx); 1840 return 0; 1841 } 1842 1843 static void 1844 ppp_compressor_rele(struct compressor *cp) 1845 { 1846 1847 mutex_enter(&ppp_compressors_mtx); 1848 --cp->comp_refcnt; 1849 mutex_exit(&ppp_compressors_mtx); 1850 } 1851 1852 static struct compressor * 1853 ppp_get_compressor_noload(uint8_t ci, bool hold) 1854 { 1855 struct compressor *cp; 1856 1857 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1858 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1859 if (cp->compress_proto == ci) { 1860 if (hold) 1861 ++cp->comp_refcnt; 1862 return cp; 1863 } 1864 } 1865 1866 return NULL; 1867 } 1868 1869 static struct compressor * 1870 ppp_get_compressor(uint8_t ci) 1871 { 1872 struct compressor *cp = NULL; 1873 const struct ppp_known_compressor *pkc; 1874 1875 mutex_enter(&ppp_compressors_mtx); 1876 cp = ppp_get_compressor_noload(ci, true); 1877 mutex_exit(&ppp_compressors_mtx); 1878 if (cp != NULL) 1879 return cp; 1880 1881 kernconfig_lock(); 1882 mutex_enter(&ppp_compressors_mtx); 1883 cp = ppp_get_compressor_noload(ci, true); 1884 mutex_exit(&ppp_compressors_mtx); 1885 if (cp == NULL) { 1886 /* Not found, so try to autoload a module */ 1887 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1888 if (pkc->code == ci) { 1889 if (module_autoload(pkc->module, 1890 MODULE_CLASS_MISC) != 0) 1891 break; 1892 mutex_enter(&ppp_compressors_mtx); 1893 cp = ppp_get_compressor_noload(ci, true); 1894 mutex_exit(&ppp_compressors_mtx); 1895 break; 1896 } 1897 } 1898 } 1899 kernconfig_unlock(); 1900 1901 return cp; 1902 } 1903 1904 int 1905 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1906 { 1907 int error = 0; 1908 size_t i; 1909 1910 mutex_enter(&ppp_compressors_mtx); 1911 for (i = 0; i < ncomp; i++) { 1912 if (ppp_get_compressor_noload(pc[i].compress_proto, 1913 false) != NULL) 1914 error = EEXIST; 1915 } 1916 if (!error) { 1917 for (i = 0; i < ncomp; i++) { 1918 pc[i].comp_refcnt = 0; 1919 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1920 } 1921 } 1922 mutex_exit(&ppp_compressors_mtx); 1923 1924 return error; 1925 } 1926 1927 int 1928 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1929 { 1930 int error = 0; 1931 size_t i; 1932 1933 mutex_enter(&ppp_compressors_mtx); 1934 for (i = 0; i < ncomp; i++) { 1935 if (ppp_get_compressor_noload(pc[i].compress_proto, 1936 false) != &pc[i]) 1937 error = ENOENT; 1938 else if (pc[i].comp_refcnt != 0) 1939 error = EBUSY; 1940 } 1941 if (!error) { 1942 for (i = 0; i < ncomp; i++) { 1943 LIST_REMOVE(&pc[i], comp_list); 1944 } 1945 } 1946 mutex_exit(&ppp_compressors_mtx); 1947 1948 return error; 1949 } 1950 1951 /* 1952 * Module infrastructure 1953 */ 1954 #include "if_module.h" 1955 1956 #ifdef PPP_FILTER 1957 #define PPP_DEP "bpf_filter," 1958 #else 1959 #define PPP_DEP 1960 #endif 1961 1962 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress") 1963
Indexes created Fri Oct 03 02:09:57 GMT 2025