if_ppp.c revision 1.135
1 /* $NetBSD: if_ppp.c,v 1.135 2011/10/28 20:13:32 dyoung 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 1.135 2011/10/28 20:13:32 dyoung Exp $"); 106 107 #include "ppp.h" 108 109 #include "opt_inet.h" 110 #include "opt_gateway.h" 111 #include "opt_ppp.h" 112 113 #ifdef INET 114 #define VJC 115 #endif 116 #define PPP_COMPRESS 117 118 #include <sys/param.h> 119 #include <sys/proc.h> 120 #include <sys/mbuf.h> 121 #include <sys/socket.h> 122 #include <sys/ioctl.h> 123 #include <sys/kernel.h> 124 #include <sys/systm.h> 125 #include <sys/time.h> 126 #include <sys/malloc.h> 127 #include <sys/module.h> 128 #include <sys/mutex.h> 129 #include <sys/once.h> 130 #include <sys/conf.h> 131 #include <sys/kauth.h> 132 #include <sys/intr.h> 133 #include <sys/socketvar.h> 134 135 #include <net/if.h> 136 #include <net/if_types.h> 137 #include <net/netisr.h> 138 #include <net/route.h> 139 #ifdef PPP_FILTER 140 #include <net/bpf.h> 141 #endif 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> 151 152 #include <net/slip.h> 153 154 #ifdef VJC 155 #include <net/slcompress.h> 156 #endif 157 158 #include <net/ppp_defs.h> 159 #include <net/if_ppp.h> 160 #include <net/if_pppvar.h> 161 #include <sys/cpu.h> 162 163 #ifdef PPP_COMPRESS 164 #define PACKETPTR struct mbuf * 165 #include <net/ppp-comp.h> 166 #endif 167 168 static int pppsioctl(struct ifnet *, u_long, void *); 169 static void ppp_requeue(struct ppp_softc *); 170 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 171 static void ppp_ccp_closed(struct ppp_softc *); 172 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 173 static void pppdumpm(struct mbuf *m0); 174 #ifdef ALTQ 175 static void ppp_ifstart(struct ifnet *ifp); 176 #endif 177 178 static void pppintr(void *); 179 180 /* 181 * Some useful mbuf macros not in mbuf.h. 182 */ 183 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 184 185 #define M_DATASTART(m) \ 186 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 187 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 188 189 #define M_DATASIZE(m) \ 190 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 191 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 192 193 /* 194 * We define two link layer specific mbuf flags, to mark high-priority 195 * packets for output, and received packets following lost/corrupted 196 * packets. 197 */ 198 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 199 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 200 201 static int ppp_clone_create(struct if_clone *, int); 202 static int ppp_clone_destroy(struct ifnet *); 203 204 static struct ppp_softc *ppp_create(const char *, int); 205 206 static LIST_HEAD(, ppp_softc) ppp_softc_list; 207 static kmutex_t ppp_list_lock; 208 209 struct if_clone ppp_cloner = 210 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 211 212 #ifdef PPP_COMPRESS 213 ONCE_DECL(ppp_compressor_mtx_init); 214 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 215 static kmutex_t ppp_compressors_mtx; 216 217 static int ppp_compressor_init(void); 218 static struct compressor *ppp_get_compressor(uint8_t); 219 static void ppp_compressor_rele(struct compressor *); 220 #endif /* PPP_COMPRESS */ 221 222 223 /* 224 * Called from boot code to establish ppp interfaces. 225 */ 226 void 227 pppattach(void) 228 { 229 extern struct linesw ppp_disc; 230 231 if (ttyldisc_attach(&ppp_disc) != 0) 232 panic("pppattach"); 233 234 mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); 235 LIST_INIT(&ppp_softc_list); 236 if_clone_attach(&ppp_cloner); 237 RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); 238 } 239 240 static struct ppp_softc * 241 ppp_create(const char *name, int unit) 242 { 243 struct ppp_softc *sc, *sci, *scl = NULL; 244 245 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 246 247 mutex_enter(&ppp_list_lock); 248 if (unit == -1) { 249 int i = 0; 250 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 251 scl = sci; 252 if (i < sci->sc_unit) { 253 unit = i; 254 break; 255 } else { 256 #ifdef DIAGNOSTIC 257 KASSERT(i == sci->sc_unit); 258 #endif 259 i++; 260 } 261 } 262 if (unit == -1) 263 unit = i; 264 } else { 265 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 266 scl = sci; 267 if (unit < sci->sc_unit) 268 break; 269 else if (unit == sci->sc_unit) { 270 free(sc, M_DEVBUF); 271 return NULL; 272 } 273 } 274 } 275 276 if (sci != NULL) 277 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 278 else if (scl != NULL) 279 LIST_INSERT_AFTER(scl, sc, sc_iflist); 280 else 281 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 282 283 mutex_exit(&ppp_list_lock); 284 285 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 286 callout_init(&sc->sc_timo_ch, 0); 287 sc->sc_if.if_softc = sc; 288 sc->sc_if.if_mtu = PPP_MTU; 289 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 290 sc->sc_if.if_type = IFT_PPP; 291 sc->sc_if.if_hdrlen = PPP_HDRLEN; 292 sc->sc_if.if_dlt = DLT_NULL; 293 sc->sc_if.if_ioctl = pppsioctl; 294 sc->sc_if.if_output = pppoutput; 295 #ifdef ALTQ 296 sc->sc_if.if_start = ppp_ifstart; 297 #endif 298 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 299 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 300 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 301 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 302 /* Ratio of 1:2 packets between the regular and the fast queue */ 303 sc->sc_maxfastq = 2; 304 IFQ_SET_READY(&sc->sc_if.if_snd); 305 if_attach(&sc->sc_if); 306 if_alloc_sadl(&sc->sc_if); 307 bpf_attach(&sc->sc_if, DLT_NULL, 0); 308 return sc; 309 } 310 311 static int 312 ppp_clone_create(struct if_clone *ifc, int unit) 313 { 314 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 315 } 316 317 static int 318 ppp_clone_destroy(struct ifnet *ifp) 319 { 320 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 321 322 if (sc->sc_devp != NULL) 323 return EBUSY; /* Not removing it */ 324 325 mutex_enter(&ppp_list_lock); 326 LIST_REMOVE(sc, sc_iflist); 327 mutex_exit(&ppp_list_lock); 328 329 bpf_detach(ifp); 330 if_detach(ifp); 331 332 free(sc, M_DEVBUF); 333 return 0; 334 } 335 336 /* 337 * Allocate a ppp interface unit and initialize it. 338 */ 339 struct ppp_softc * 340 pppalloc(pid_t pid) 341 { 342 struct ppp_softc *sc = NULL, *scf; 343 int i; 344 345 mutex_enter(&ppp_list_lock); 346 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 347 if (scf->sc_xfer == pid) { 348 scf->sc_xfer = 0; 349 mutex_exit(&ppp_list_lock); 350 return scf; 351 } 352 if (scf->sc_devp == NULL && sc == NULL) 353 sc = scf; 354 } 355 mutex_exit(&ppp_list_lock); 356 357 if (sc == NULL) 358 sc = ppp_create(ppp_cloner.ifc_name, -1); 359 360 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 361 if (sc->sc_si == NULL) { 362 printf("%s: unable to establish softintr\n", sc->sc_if.if_xname); 363 return (NULL); 364 } 365 sc->sc_flags = 0; 366 sc->sc_mru = PPP_MRU; 367 sc->sc_relinq = NULL; 368 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 369 #ifdef VJC 370 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 371 if (sc->sc_comp) 372 sl_compress_init(sc->sc_comp); 373 #endif 374 #ifdef PPP_COMPRESS 375 sc->sc_xc_state = NULL; 376 sc->sc_rc_state = NULL; 377 #endif /* PPP_COMPRESS */ 378 for (i = 0; i < NUM_NP; ++i) 379 sc->sc_npmode[i] = NPMODE_ERROR; 380 sc->sc_npqueue = NULL; 381 sc->sc_npqtail = &sc->sc_npqueue; 382 sc->sc_last_sent = sc->sc_last_recv = time_second; 383 384 return sc; 385 } 386 387 /* 388 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 389 */ 390 void 391 pppdealloc(struct ppp_softc *sc) 392 { 393 struct mbuf *m; 394 395 softint_disestablish(sc->sc_si); 396 if_down(&sc->sc_if); 397 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 398 sc->sc_devp = NULL; 399 sc->sc_xfer = 0; 400 for (;;) { 401 IF_DEQUEUE(&sc->sc_rawq, m); 402 if (m == NULL) 403 break; 404 m_freem(m); 405 } 406 for (;;) { 407 IF_DEQUEUE(&sc->sc_inq, m); 408 if (m == NULL) 409 break; 410 m_freem(m); 411 } 412 for (;;) { 413 IF_DEQUEUE(&sc->sc_fastq, m); 414 if (m == NULL) 415 break; 416 m_freem(m); 417 } 418 while ((m = sc->sc_npqueue) != NULL) { 419 sc->sc_npqueue = m->m_nextpkt; 420 m_freem(m); 421 } 422 if (sc->sc_togo != NULL) { 423 m_freem(sc->sc_togo); 424 sc->sc_togo = NULL; 425 } 426 #ifdef PPP_COMPRESS 427 ppp_ccp_closed(sc); 428 sc->sc_xc_state = NULL; 429 sc->sc_rc_state = NULL; 430 #endif /* PPP_COMPRESS */ 431 #ifdef PPP_FILTER 432 if (sc->sc_pass_filt_in.bf_insns != 0) { 433 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 434 sc->sc_pass_filt_in.bf_insns = 0; 435 sc->sc_pass_filt_in.bf_len = 0; 436 } 437 if (sc->sc_pass_filt_out.bf_insns != 0) { 438 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 439 sc->sc_pass_filt_out.bf_insns = 0; 440 sc->sc_pass_filt_out.bf_len = 0; 441 } 442 if (sc->sc_active_filt_in.bf_insns != 0) { 443 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 444 sc->sc_active_filt_in.bf_insns = 0; 445 sc->sc_active_filt_in.bf_len = 0; 446 } 447 if (sc->sc_active_filt_out.bf_insns != 0) { 448 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 449 sc->sc_active_filt_out.bf_insns = 0; 450 sc->sc_active_filt_out.bf_len = 0; 451 } 452 #endif /* PPP_FILTER */ 453 #ifdef VJC 454 if (sc->sc_comp != 0) { 455 free(sc->sc_comp, M_DEVBUF); 456 sc->sc_comp = 0; 457 } 458 #endif 459 (void)ppp_clone_destroy(&sc->sc_if); 460 } 461 462 /* 463 * Ioctl routine for generic ppp devices. 464 */ 465 int 466 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 467 struct lwp *l) 468 { 469 int s, error, flags, mru, npx; 470 u_int nb; 471 struct ppp_option_data *odp; 472 struct compressor *cp; 473 struct npioctl *npi; 474 time_t t; 475 #ifdef PPP_FILTER 476 struct bpf_program *bp, *nbp; 477 struct bpf_insn *newcode, *oldcode; 478 int newcodelen; 479 #endif /* PPP_FILTER */ 480 #ifdef PPP_COMPRESS 481 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 482 #endif 483 484 switch (cmd) { 485 case PPPIOCSFLAGS: 486 case PPPIOCSMRU: 487 case PPPIOCSMAXCID: 488 case PPPIOCSCOMPRESS: 489 case PPPIOCSNPMODE: 490 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 491 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, KAUTH_ARG(cmd), 492 NULL) != 0) 493 return (EPERM); 494 break; 495 case PPPIOCXFERUNIT: 496 /* XXX: Why is this privileged?! */ 497 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 498 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, KAUTH_ARG(cmd), 499 NULL) != 0) 500 return (EPERM); 501 break; 502 default: 503 break; 504 } 505 506 switch (cmd) { 507 case FIONREAD: 508 *(int *)data = sc->sc_inq.ifq_len; 509 break; 510 511 case PPPIOCGUNIT: 512 *(int *)data = sc->sc_unit; 513 break; 514 515 case PPPIOCGFLAGS: 516 *(u_int *)data = sc->sc_flags; 517 break; 518 519 case PPPIOCGRAWIN: 520 { 521 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 522 u_char c, q = 0; 523 524 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 525 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 526 527 for (c = 0; c < sc->sc_rawin_start;) 528 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 529 530 rwin->count = sc->sc_rawin.count; 531 } 532 break; 533 534 case PPPIOCSFLAGS: 535 flags = *(int *)data & SC_MASK; 536 s = splsoftnet(); 537 #ifdef PPP_COMPRESS 538 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 539 ppp_ccp_closed(sc); 540 #endif 541 splhigh(); /* XXX IMP ME HARDER */ 542 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 543 splx(s); 544 break; 545 546 case PPPIOCSMRU: 547 mru = *(int *)data; 548 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 549 sc->sc_mru = mru; 550 break; 551 552 case PPPIOCGMRU: 553 *(int *)data = sc->sc_mru; 554 break; 555 556 #ifdef VJC 557 case PPPIOCSMAXCID: 558 if (sc->sc_comp) { 559 s = splsoftnet(); 560 sl_compress_setup(sc->sc_comp, *(int *)data); 561 splx(s); 562 } 563 break; 564 #endif 565 566 case PPPIOCXFERUNIT: 567 sc->sc_xfer = l->l_proc->p_pid; 568 break; 569 570 #ifdef PPP_COMPRESS 571 case PPPIOCSCOMPRESS: 572 odp = (struct ppp_option_data *) data; 573 nb = odp->length; 574 if (nb > sizeof(ccp_option)) 575 nb = sizeof(ccp_option); 576 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 577 return (error); 578 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 579 return (EINVAL); 580 cp = ppp_get_compressor(ccp_option[0]); 581 if (cp == NULL) { 582 if (sc->sc_flags & SC_DEBUG) 583 printf("%s: no compressor for [%x %x %x], %x\n", 584 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 585 ccp_option[2], nb); 586 return (EINVAL); /* no handler found */ 587 } 588 /* 589 * Found a handler for the protocol - try to allocate 590 * a compressor or decompressor. 591 */ 592 error = 0; 593 if (odp->transmit) { 594 s = splsoftnet(); 595 if (sc->sc_xc_state != NULL) { 596 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 597 ppp_compressor_rele(sc->sc_xcomp); 598 } 599 sc->sc_xcomp = cp; 600 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 601 if (sc->sc_xc_state == NULL) { 602 if (sc->sc_flags & SC_DEBUG) 603 printf("%s: comp_alloc failed\n", 604 sc->sc_if.if_xname); 605 error = ENOBUFS; 606 } 607 splhigh(); /* XXX IMP ME HARDER */ 608 sc->sc_flags &= ~SC_COMP_RUN; 609 splx(s); 610 } else { 611 s = splsoftnet(); 612 if (sc->sc_rc_state != NULL) { 613 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 614 ppp_compressor_rele(sc->sc_rcomp); 615 } 616 sc->sc_rcomp = cp; 617 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 618 if (sc->sc_rc_state == NULL) { 619 if (sc->sc_flags & SC_DEBUG) 620 printf("%s: decomp_alloc failed\n", 621 sc->sc_if.if_xname); 622 error = ENOBUFS; 623 } 624 splhigh(); /* XXX IMP ME HARDER */ 625 sc->sc_flags &= ~SC_DECOMP_RUN; 626 splx(s); 627 } 628 return (error); 629 #endif /* PPP_COMPRESS */ 630 631 case PPPIOCGNPMODE: 632 case PPPIOCSNPMODE: 633 npi = (struct npioctl *) data; 634 switch (npi->protocol) { 635 case PPP_IP: 636 npx = NP_IP; 637 break; 638 case PPP_IPV6: 639 npx = NP_IPV6; 640 break; 641 default: 642 return EINVAL; 643 } 644 if (cmd == PPPIOCGNPMODE) { 645 npi->mode = sc->sc_npmode[npx]; 646 } else { 647 if (npi->mode != sc->sc_npmode[npx]) { 648 s = splnet(); 649 sc->sc_npmode[npx] = npi->mode; 650 if (npi->mode != NPMODE_QUEUE) { 651 ppp_requeue(sc); 652 ppp_restart(sc); 653 } 654 splx(s); 655 } 656 } 657 break; 658 659 case PPPIOCGIDLE: 660 s = splsoftnet(); 661 t = time_second; 662 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 663 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 664 splx(s); 665 break; 666 667 #ifdef PPP_FILTER 668 case PPPIOCSPASS: 669 case PPPIOCSACTIVE: 670 /* These are no longer supported. */ 671 return EOPNOTSUPP; 672 673 case PPPIOCSIPASS: 674 case PPPIOCSOPASS: 675 case PPPIOCSIACTIVE: 676 case PPPIOCSOACTIVE: 677 nbp = (struct bpf_program *) data; 678 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 679 return EINVAL; 680 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 681 if (newcodelen != 0) { 682 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 683 /* WAITOK -- malloc() never fails. */ 684 if ((error = copyin((void *)nbp->bf_insns, (void *)newcode, 685 newcodelen)) != 0) { 686 free(newcode, M_DEVBUF); 687 return error; 688 } 689 if (!bpf_validate(newcode, nbp->bf_len)) { 690 free(newcode, M_DEVBUF); 691 return EINVAL; 692 } 693 } else 694 newcode = 0; 695 switch (cmd) { 696 case PPPIOCSIPASS: 697 bp = &sc->sc_pass_filt_in; 698 break; 699 700 case PPPIOCSOPASS: 701 bp = &sc->sc_pass_filt_out; 702 break; 703 704 case PPPIOCSIACTIVE: 705 bp = &sc->sc_active_filt_in; 706 break; 707 708 case PPPIOCSOACTIVE: 709 bp = &sc->sc_active_filt_out; 710 break; 711 default: 712 free(newcode, M_DEVBUF); 713 return (EPASSTHROUGH); 714 } 715 oldcode = bp->bf_insns; 716 s = splnet(); 717 bp->bf_len = nbp->bf_len; 718 bp->bf_insns = newcode; 719 splx(s); 720 if (oldcode != 0) 721 free(oldcode, M_DEVBUF); 722 break; 723 #endif /* PPP_FILTER */ 724 725 default: 726 return (EPASSTHROUGH); 727 } 728 return (0); 729 } 730 731 /* 732 * Process an ioctl request to the ppp network interface. 733 */ 734 static int 735 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 736 { 737 struct ppp_softc *sc = ifp->if_softc; 738 struct ifaddr *ifa = (struct ifaddr *)data; 739 struct ifreq *ifr = (struct ifreq *)data; 740 struct ppp_stats *psp; 741 #ifdef PPP_COMPRESS 742 struct ppp_comp_stats *pcp; 743 #endif 744 int s = splnet(), error = 0; 745 746 switch (cmd) { 747 case SIOCSIFFLAGS: 748 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 749 break; 750 if ((ifp->if_flags & IFF_RUNNING) == 0) 751 ifp->if_flags &= ~IFF_UP; 752 break; 753 754 case SIOCINITIFADDR: 755 switch (ifa->ifa_addr->sa_family) { 756 #ifdef INET 757 case AF_INET: 758 break; 759 #endif 760 #ifdef INET6 761 case AF_INET6: 762 break; 763 #endif 764 default: 765 error = EAFNOSUPPORT; 766 break; 767 } 768 break; 769 770 case SIOCSIFDSTADDR: 771 switch (ifa->ifa_addr->sa_family) { 772 #ifdef INET 773 case AF_INET: 774 break; 775 #endif 776 #ifdef INET6 777 case AF_INET6: 778 break; 779 #endif 780 default: 781 error = EAFNOSUPPORT; 782 break; 783 } 784 break; 785 786 case SIOCADDMULTI: 787 case SIOCDELMULTI: 788 if (ifr == NULL) { 789 error = EAFNOSUPPORT; 790 break; 791 } 792 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 793 #ifdef INET 794 case AF_INET: 795 break; 796 #endif 797 #ifdef INET6 798 case AF_INET6: 799 break; 800 #endif 801 default: 802 error = EAFNOSUPPORT; 803 break; 804 } 805 break; 806 807 case SIOCGPPPSTATS: 808 psp = &((struct ifpppstatsreq *) data)->stats; 809 memset(psp, 0, sizeof(*psp)); 810 psp->p = sc->sc_stats; 811 #if defined(VJC) && !defined(SL_NO_STATS) 812 if (sc->sc_comp) { 813 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 814 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 815 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 816 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 817 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 818 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 819 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 820 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 821 } 822 #endif /* VJC */ 823 break; 824 825 #ifdef PPP_COMPRESS 826 case SIOCGPPPCSTATS: 827 pcp = &((struct ifpppcstatsreq *) data)->stats; 828 memset(pcp, 0, sizeof(*pcp)); 829 if (sc->sc_xc_state != NULL) 830 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 831 if (sc->sc_rc_state != NULL) 832 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 833 break; 834 #endif /* PPP_COMPRESS */ 835 836 default: 837 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 838 error = 0; 839 break; 840 } 841 splx(s); 842 return (error); 843 } 844 845 /* 846 * Queue a packet. Start transmission if not active. 847 * Packet is placed in Information field of PPP frame. 848 */ 849 int 850 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 851 struct rtentry *rtp) 852 { 853 struct ppp_softc *sc = ifp->if_softc; 854 int protocol, address, control; 855 u_char *cp; 856 int s, error; 857 #ifdef INET 858 struct ip *ip; 859 #endif 860 struct ifqueue *ifq; 861 enum NPmode mode; 862 int len; 863 ALTQ_DECL(struct altq_pktattr pktattr;) 864 865 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 866 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 867 error = ENETDOWN; /* sort of */ 868 goto bad; 869 } 870 871 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 872 873 /* 874 * Compute PPP header. 875 */ 876 m0->m_flags &= ~M_HIGHPRI; 877 switch (dst->sa_family) { 878 #ifdef INET 879 case AF_INET: 880 address = PPP_ALLSTATIONS; 881 control = PPP_UI; 882 protocol = PPP_IP; 883 mode = sc->sc_npmode[NP_IP]; 884 885 /* 886 * If this packet has the "low delay" bit set in the IP header, 887 * put it on the fastq instead. 888 */ 889 ip = mtod(m0, struct ip *); 890 if (ip->ip_tos & IPTOS_LOWDELAY) 891 m0->m_flags |= M_HIGHPRI; 892 break; 893 #endif 894 #ifdef INET6 895 case AF_INET6: 896 address = PPP_ALLSTATIONS; /*XXX*/ 897 control = PPP_UI; /*XXX*/ 898 protocol = PPP_IPV6; 899 mode = sc->sc_npmode[NP_IPV6]; 900 901 #if 0 /* XXX flowinfo/traffic class, maybe? */ 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 #endif 910 break; 911 #endif 912 case AF_UNSPEC: 913 address = PPP_ADDRESS(dst->sa_data); 914 control = PPP_CONTROL(dst->sa_data); 915 protocol = PPP_PROTOCOL(dst->sa_data); 916 mode = NPMODE_PASS; 917 break; 918 default: 919 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 920 error = EAFNOSUPPORT; 921 goto bad; 922 } 923 924 /* 925 * Drop this packet, or return an error, if necessary. 926 */ 927 if (mode == NPMODE_ERROR) { 928 error = ENETDOWN; 929 goto bad; 930 } 931 if (mode == NPMODE_DROP) { 932 error = 0; 933 goto bad; 934 } 935 936 /* 937 * Add PPP header. 938 */ 939 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 940 if (m0 == NULL) { 941 error = ENOBUFS; 942 goto bad; 943 } 944 945 cp = mtod(m0, u_char *); 946 *cp++ = address; 947 *cp++ = control; 948 *cp++ = protocol >> 8; 949 *cp++ = protocol & 0xff; 950 951 len = m_length(m0); 952 953 if (sc->sc_flags & SC_LOG_OUTPKT) { 954 printf("%s output: ", ifp->if_xname); 955 pppdumpm(m0); 956 } 957 958 if ((protocol & 0x8000) == 0) { 959 #ifdef PPP_FILTER 960 /* 961 * Apply the pass and active filters to the packet, 962 * but only if it is a data packet. 963 */ 964 if (sc->sc_pass_filt_out.bf_insns != 0 965 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 966 len, 0) == 0) { 967 error = 0; /* drop this packet */ 968 goto bad; 969 } 970 971 /* 972 * Update the time we sent the most recent packet. 973 */ 974 if (sc->sc_active_filt_out.bf_insns == 0 975 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 976 len, 0)) 977 sc->sc_last_sent = time_second; 978 #else 979 /* 980 * Update the time we sent the most recent packet. 981 */ 982 sc->sc_last_sent = time_second; 983 #endif /* PPP_FILTER */ 984 } 985 986 /* 987 * See if bpf wants to look at the packet. 988 */ 989 bpf_mtap(&sc->sc_if, m0); 990 991 /* 992 * Put the packet on the appropriate queue. 993 */ 994 s = splnet(); 995 if (mode == NPMODE_QUEUE) { 996 /* XXX we should limit the number of packets on this queue */ 997 *sc->sc_npqtail = m0; 998 m0->m_nextpkt = NULL; 999 sc->sc_npqtail = &m0->m_nextpkt; 1000 } else { 1001 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1002 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 1003 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { 1004 splx(s); 1005 sc->sc_if.if_oerrors++; 1006 sc->sc_stats.ppp_oerrors++; 1007 return (error); 1008 } 1009 ppp_restart(sc); 1010 } 1011 ifp->if_opackets++; 1012 ifp->if_obytes += len; 1013 1014 splx(s); 1015 return (0); 1016 1017 bad: 1018 m_freem(m0); 1019 return (error); 1020 } 1021 1022 /* 1023 * After a change in the NPmode for some NP, move packets from the 1024 * npqueue to the send queue or the fast queue as appropriate. 1025 * Should be called at splnet, since we muck with the queues. 1026 */ 1027 static void 1028 ppp_requeue(struct ppp_softc *sc) 1029 { 1030 struct mbuf *m, **mpp; 1031 struct ifqueue *ifq; 1032 enum NPmode mode; 1033 int error; 1034 1035 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1036 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1037 case PPP_IP: 1038 mode = sc->sc_npmode[NP_IP]; 1039 break; 1040 case PPP_IPV6: 1041 mode = sc->sc_npmode[NP_IPV6]; 1042 break; 1043 default: 1044 mode = NPMODE_PASS; 1045 } 1046 1047 switch (mode) { 1048 case NPMODE_PASS: 1049 /* 1050 * This packet can now go on one of the queues to be sent. 1051 */ 1052 *mpp = m->m_nextpkt; 1053 m->m_nextpkt = NULL; 1054 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1055 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA 1056 ALTQ_DECL(NULL))) != 0) { 1057 sc->sc_if.if_oerrors++; 1058 sc->sc_stats.ppp_oerrors++; 1059 } 1060 break; 1061 1062 case NPMODE_DROP: 1063 case NPMODE_ERROR: 1064 *mpp = m->m_nextpkt; 1065 m_freem(m); 1066 break; 1067 1068 case NPMODE_QUEUE: 1069 mpp = &m->m_nextpkt; 1070 break; 1071 } 1072 } 1073 sc->sc_npqtail = mpp; 1074 } 1075 1076 /* 1077 * Transmitter has finished outputting some stuff; 1078 * remember to call sc->sc_start later at splsoftnet. 1079 */ 1080 void 1081 ppp_restart(struct ppp_softc *sc) 1082 { 1083 int s = splhigh(); /* XXX IMP ME HARDER */ 1084 1085 sc->sc_flags &= ~SC_TBUSY; 1086 softint_schedule(sc->sc_si); 1087 splx(s); 1088 } 1089 1090 /* 1091 * Get a packet to send. This procedure is intended to be called at 1092 * splsoftnet, since it may involve time-consuming operations such as 1093 * applying VJ compression, packet compression, address/control and/or 1094 * protocol field compression to the packet. 1095 */ 1096 struct mbuf * 1097 ppp_dequeue(struct ppp_softc *sc) 1098 { 1099 struct mbuf *m, *mp; 1100 u_char *cp; 1101 int address, control, protocol; 1102 int s; 1103 1104 /* 1105 * Grab a packet to send: first try the fast queue, then the 1106 * normal queue. 1107 */ 1108 s = splnet(); 1109 if (sc->sc_nfastq < sc->sc_maxfastq) { 1110 IF_DEQUEUE(&sc->sc_fastq, m); 1111 if (m != NULL) 1112 sc->sc_nfastq++; 1113 else 1114 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1115 } else { 1116 sc->sc_nfastq = 0; 1117 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1118 if (m == NULL) { 1119 IF_DEQUEUE(&sc->sc_fastq, m); 1120 if (m != NULL) 1121 sc->sc_nfastq++; 1122 } 1123 } 1124 splx(s); 1125 1126 if (m == NULL) 1127 return NULL; 1128 1129 ++sc->sc_stats.ppp_opackets; 1130 1131 /* 1132 * Extract the ppp header of the new packet. 1133 * The ppp header will be in one mbuf. 1134 */ 1135 cp = mtod(m, u_char *); 1136 address = PPP_ADDRESS(cp); 1137 control = PPP_CONTROL(cp); 1138 protocol = PPP_PROTOCOL(cp); 1139 1140 switch (protocol) { 1141 case PPP_IP: 1142 #ifdef VJC 1143 /* 1144 * If the packet is a TCP/IP packet, see if we can compress it. 1145 */ 1146 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1147 struct ip *ip; 1148 int type; 1149 1150 mp = m; 1151 ip = (struct ip *) (cp + PPP_HDRLEN); 1152 if (mp->m_len <= PPP_HDRLEN) { 1153 mp = mp->m_next; 1154 if (mp == NULL) 1155 break; 1156 ip = mtod(mp, struct ip *); 1157 } 1158 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1159 if (ip->ip_p == IPPROTO_TCP) { 1160 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1161 !(sc->sc_flags & SC_NO_TCP_CCID)); 1162 switch (type) { 1163 case TYPE_UNCOMPRESSED_TCP: 1164 protocol = PPP_VJC_UNCOMP; 1165 break; 1166 case TYPE_COMPRESSED_TCP: 1167 protocol = PPP_VJC_COMP; 1168 cp = mtod(m, u_char *); 1169 cp[0] = address; /* header has moved */ 1170 cp[1] = control; 1171 cp[2] = 0; 1172 break; 1173 } 1174 cp[3] = protocol; /* update protocol in PPP header */ 1175 } 1176 } 1177 #endif /* VJC */ 1178 break; 1179 1180 #ifdef PPP_COMPRESS 1181 case PPP_CCP: 1182 ppp_ccp(sc, m, 0); 1183 break; 1184 #endif /* PPP_COMPRESS */ 1185 } 1186 1187 #ifdef PPP_COMPRESS 1188 if (protocol != PPP_LCP && protocol != PPP_CCP 1189 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1190 struct mbuf *mcomp = NULL; 1191 int slen; 1192 1193 slen = 0; 1194 for (mp = m; mp != NULL; mp = mp->m_next) 1195 slen += mp->m_len; 1196 (*sc->sc_xcomp->compress) 1197 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1198 if (mcomp != NULL) { 1199 if (sc->sc_flags & SC_CCP_UP) { 1200 /* Send the compressed packet instead of the original. */ 1201 m_freem(m); 1202 m = mcomp; 1203 cp = mtod(m, u_char *); 1204 protocol = cp[3]; 1205 } else { 1206 /* Can't transmit compressed packets until CCP is up. */ 1207 m_freem(mcomp); 1208 } 1209 } 1210 } 1211 #endif /* PPP_COMPRESS */ 1212 1213 /* 1214 * Compress the address/control and protocol, if possible. 1215 */ 1216 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1217 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1218 protocol != PPP_LCP) { 1219 /* can compress address/control */ 1220 m->m_data += 2; 1221 m->m_len -= 2; 1222 } 1223 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1224 /* can compress protocol */ 1225 if (mtod(m, u_char *) == cp) { 1226 cp[2] = cp[1]; /* move address/control up */ 1227 cp[1] = cp[0]; 1228 } 1229 ++m->m_data; 1230 --m->m_len; 1231 } 1232 1233 return m; 1234 } 1235 1236 /* 1237 * Software interrupt routine, called at splsoftnet. 1238 */ 1239 static void 1240 pppintr(void *arg) 1241 { 1242 struct ppp_softc *sc = arg; 1243 struct mbuf *m; 1244 int s; 1245 1246 mutex_enter(softnet_lock); 1247 if (!(sc->sc_flags & SC_TBUSY) 1248 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1249 || sc->sc_outm)) { 1250 s = splhigh(); /* XXX IMP ME HARDER */ 1251 sc->sc_flags |= SC_TBUSY; 1252 splx(s); 1253 (*sc->sc_start)(sc); 1254 } 1255 for (;;) { 1256 s = splnet(); 1257 IF_DEQUEUE(&sc->sc_rawq, m); 1258 splx(s); 1259 if (m == NULL) 1260 break; 1261 ppp_inproc(sc, m); 1262 } 1263 mutex_exit(softnet_lock); 1264 } 1265 1266 #ifdef PPP_COMPRESS 1267 /* 1268 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1269 * 0 if it is about to be transmitted. 1270 */ 1271 static void 1272 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1273 { 1274 u_char *dp, *ep; 1275 struct mbuf *mp; 1276 int slen, s; 1277 1278 /* 1279 * Get a pointer to the data after the PPP header. 1280 */ 1281 if (m->m_len <= PPP_HDRLEN) { 1282 mp = m->m_next; 1283 if (mp == NULL) 1284 return; 1285 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1286 } else { 1287 mp = m; 1288 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1289 } 1290 1291 ep = mtod(mp, u_char *) + mp->m_len; 1292 if (dp + CCP_HDRLEN > ep) 1293 return; 1294 slen = CCP_LENGTH(dp); 1295 if (dp + slen > ep) { 1296 if (sc->sc_flags & SC_DEBUG) 1297 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1298 dp, slen, mtod(mp, u_char *), mp->m_len); 1299 return; 1300 } 1301 1302 switch (CCP_CODE(dp)) { 1303 case CCP_CONFREQ: 1304 case CCP_TERMREQ: 1305 case CCP_TERMACK: 1306 /* CCP must be going down - disable compression */ 1307 if (sc->sc_flags & SC_CCP_UP) { 1308 s = splhigh(); /* XXX IMP ME HARDER */ 1309 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1310 splx(s); 1311 } 1312 break; 1313 1314 case CCP_CONFACK: 1315 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1316 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1317 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1318 if (!rcvd) { 1319 /* we're agreeing to send compressed packets. */ 1320 if (sc->sc_xc_state != NULL 1321 && (*sc->sc_xcomp->comp_init) 1322 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1323 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1324 s = splhigh(); /* XXX IMP ME HARDER */ 1325 sc->sc_flags |= SC_COMP_RUN; 1326 splx(s); 1327 } 1328 } else { 1329 /* peer is agreeing to send compressed packets. */ 1330 if (sc->sc_rc_state != NULL 1331 && (*sc->sc_rcomp->decomp_init) 1332 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1333 sc->sc_unit, 0, sc->sc_mru, 1334 sc->sc_flags & SC_DEBUG)) { 1335 s = splhigh(); /* XXX IMP ME HARDER */ 1336 sc->sc_flags |= SC_DECOMP_RUN; 1337 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1338 splx(s); 1339 } 1340 } 1341 } 1342 break; 1343 1344 case CCP_RESETACK: 1345 if (sc->sc_flags & SC_CCP_UP) { 1346 if (!rcvd) { 1347 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1348 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1349 } else { 1350 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1351 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1352 s = splhigh(); /* XXX IMP ME HARDER */ 1353 sc->sc_flags &= ~SC_DC_ERROR; 1354 splx(s); 1355 } 1356 } 1357 } 1358 break; 1359 } 1360 } 1361 1362 /* 1363 * CCP is down; free (de)compressor state if necessary. 1364 */ 1365 static void 1366 ppp_ccp_closed(struct ppp_softc *sc) 1367 { 1368 if (sc->sc_xc_state) { 1369 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1370 ppp_compressor_rele(sc->sc_xcomp); 1371 sc->sc_xc_state = NULL; 1372 } 1373 if (sc->sc_rc_state) { 1374 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1375 ppp_compressor_rele(sc->sc_rcomp); 1376 sc->sc_rc_state = NULL; 1377 } 1378 } 1379 #endif /* PPP_COMPRESS */ 1380 1381 /* 1382 * PPP packet input routine. 1383 * The caller has checked and removed the FCS and has inserted 1384 * the address/control bytes and the protocol high byte if they 1385 * were omitted. 1386 */ 1387 void 1388 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1389 { 1390 int s = splhigh(); /* XXX IMP ME HARDER */ 1391 1392 if (lost) 1393 m->m_flags |= M_ERRMARK; 1394 IF_ENQUEUE(&sc->sc_rawq, m); 1395 softint_schedule(sc->sc_si); 1396 splx(s); 1397 } 1398 1399 /* 1400 * Process a received PPP packet, doing decompression as necessary. 1401 * Should be called at splsoftnet. 1402 */ 1403 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1404 TYPE_UNCOMPRESSED_TCP) 1405 1406 static void 1407 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1408 { 1409 struct ifnet *ifp = &sc->sc_if; 1410 struct ifqueue *inq; 1411 int s, ilen, proto, rv; 1412 u_char *cp, adrs, ctrl; 1413 struct mbuf *mp, *dmp = NULL; 1414 #ifdef VJC 1415 int xlen; 1416 u_char *iphdr; 1417 u_int hlen; 1418 #endif 1419 1420 sc->sc_stats.ppp_ipackets++; 1421 1422 if (sc->sc_flags & SC_LOG_INPKT) { 1423 ilen = 0; 1424 for (mp = m; mp != NULL; mp = mp->m_next) 1425 ilen += mp->m_len; 1426 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1427 pppdumpm(m); 1428 } 1429 1430 cp = mtod(m, u_char *); 1431 adrs = PPP_ADDRESS(cp); 1432 ctrl = PPP_CONTROL(cp); 1433 proto = PPP_PROTOCOL(cp); 1434 1435 if (m->m_flags & M_ERRMARK) { 1436 m->m_flags &= ~M_ERRMARK; 1437 s = splhigh(); /* XXX IMP ME HARDER */ 1438 sc->sc_flags |= SC_VJ_RESET; 1439 splx(s); 1440 } 1441 1442 #ifdef PPP_COMPRESS 1443 /* 1444 * Decompress this packet if necessary, update the receiver's 1445 * dictionary, or take appropriate action on a CCP packet. 1446 */ 1447 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1448 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1449 /* decompress this packet */ 1450 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1451 if (rv == DECOMP_OK) { 1452 m_freem(m); 1453 if (dmp == NULL) { 1454 /* no error, but no decompressed packet produced */ 1455 return; 1456 } 1457 m = dmp; 1458 cp = mtod(m, u_char *); 1459 proto = PPP_PROTOCOL(cp); 1460 1461 } else { 1462 /* 1463 * An error has occurred in decompression. 1464 * Pass the compressed packet up to pppd, which may take 1465 * CCP down or issue a Reset-Req. 1466 */ 1467 if (sc->sc_flags & SC_DEBUG) 1468 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1469 s = splhigh(); /* XXX IMP ME HARDER */ 1470 sc->sc_flags |= SC_VJ_RESET; 1471 if (rv == DECOMP_ERROR) 1472 sc->sc_flags |= SC_DC_ERROR; 1473 else 1474 sc->sc_flags |= SC_DC_FERROR; 1475 splx(s); 1476 } 1477 1478 } else { 1479 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1480 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1481 } 1482 if (proto == PPP_CCP) { 1483 ppp_ccp(sc, m, 1); 1484 } 1485 } 1486 #endif 1487 1488 ilen = 0; 1489 for (mp = m; mp != NULL; mp = mp->m_next) 1490 ilen += mp->m_len; 1491 1492 #ifdef VJC 1493 if (sc->sc_flags & SC_VJ_RESET) { 1494 /* 1495 * If we've missed a packet, we must toss subsequent compressed 1496 * packets which don't have an explicit connection ID. 1497 */ 1498 if (sc->sc_comp) 1499 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1500 s = splhigh(); /* XXX IMP ME HARDER */ 1501 sc->sc_flags &= ~SC_VJ_RESET; 1502 splx(s); 1503 } 1504 1505 /* 1506 * See if we have a VJ-compressed packet to uncompress. 1507 */ 1508 if (proto == PPP_VJC_COMP) { 1509 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1510 goto bad; 1511 1512 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1513 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1514 sc->sc_comp, &iphdr, &hlen); 1515 1516 if (xlen <= 0) { 1517 if (sc->sc_flags & SC_DEBUG) 1518 printf("%s: VJ uncompress failed on type comp\n", 1519 ifp->if_xname); 1520 goto bad; 1521 } 1522 1523 /* Copy the PPP and IP headers into a new mbuf. */ 1524 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1525 if (mp == NULL) 1526 goto bad; 1527 mp->m_len = 0; 1528 mp->m_next = NULL; 1529 if (hlen + PPP_HDRLEN > MHLEN) { 1530 MCLGET(mp, M_DONTWAIT); 1531 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1532 m_freem(mp); 1533 goto bad; /* lose if big headers and no clusters */ 1534 } 1535 } 1536 cp = mtod(mp, u_char *); 1537 cp[0] = adrs; 1538 cp[1] = ctrl; 1539 cp[2] = 0; 1540 cp[3] = PPP_IP; 1541 proto = PPP_IP; 1542 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1543 mp->m_len = hlen + PPP_HDRLEN; 1544 1545 /* 1546 * Trim the PPP and VJ headers off the old mbuf 1547 * and stick the new and old mbufs together. 1548 */ 1549 m->m_data += PPP_HDRLEN + xlen; 1550 m->m_len -= PPP_HDRLEN + xlen; 1551 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1552 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1553 mp->m_len += m->m_len; 1554 MFREE(m, mp->m_next); 1555 } else 1556 mp->m_next = m; 1557 m = mp; 1558 ilen += hlen - xlen; 1559 1560 } else if (proto == PPP_VJC_UNCOMP) { 1561 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1562 goto bad; 1563 1564 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1565 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1566 sc->sc_comp, &iphdr, &hlen); 1567 1568 if (xlen < 0) { 1569 if (sc->sc_flags & SC_DEBUG) 1570 printf("%s: VJ uncompress failed on type uncomp\n", 1571 ifp->if_xname); 1572 goto bad; 1573 } 1574 1575 proto = PPP_IP; 1576 cp[3] = PPP_IP; 1577 } 1578 #endif /* VJC */ 1579 1580 /* 1581 * If the packet will fit in a header mbuf, don't waste a 1582 * whole cluster on it. 1583 */ 1584 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1585 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1586 if (mp != NULL) { 1587 m_copydata(m, 0, ilen, mtod(mp, void *)); 1588 m_freem(m); 1589 m = mp; 1590 m->m_len = ilen; 1591 } 1592 } 1593 m->m_pkthdr.len = ilen; 1594 m->m_pkthdr.rcvif = ifp; 1595 1596 if ((proto & 0x8000) == 0) { 1597 #ifdef PPP_FILTER 1598 /* 1599 * See whether we want to pass this packet, and 1600 * if it counts as link activity. 1601 */ 1602 if (sc->sc_pass_filt_in.bf_insns != 0 1603 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1604 ilen, 0) == 0) { 1605 /* drop this packet */ 1606 m_freem(m); 1607 return; 1608 } 1609 if (sc->sc_active_filt_in.bf_insns == 0 1610 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1611 ilen, 0)) 1612 sc->sc_last_recv = time_second; 1613 #else 1614 /* 1615 * Record the time that we received this packet. 1616 */ 1617 sc->sc_last_recv = time_second; 1618 #endif /* PPP_FILTER */ 1619 } 1620 1621 /* See if bpf wants to look at the packet. */ 1622 bpf_mtap(&sc->sc_if, m); 1623 1624 rv = 0; 1625 switch (proto) { 1626 #ifdef INET 1627 case PPP_IP: 1628 /* 1629 * IP packet - take off the ppp header and pass it up to IP. 1630 */ 1631 if ((ifp->if_flags & IFF_UP) == 0 1632 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1633 /* interface is down - drop the packet. */ 1634 m_freem(m); 1635 return; 1636 } 1637 m->m_pkthdr.len -= PPP_HDRLEN; 1638 m->m_data += PPP_HDRLEN; 1639 m->m_len -= PPP_HDRLEN; 1640 #ifdef GATEWAY 1641 if (ipflow_fastforward(m)) 1642 return; 1643 #endif 1644 schednetisr(NETISR_IP); 1645 inq = &ipintrq; 1646 break; 1647 #endif 1648 1649 #ifdef INET6 1650 case PPP_IPV6: 1651 /* 1652 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1653 */ 1654 if ((ifp->if_flags & IFF_UP) == 0 1655 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1656 /* interface is down - drop the packet. */ 1657 m_freem(m); 1658 return; 1659 } 1660 m->m_pkthdr.len -= PPP_HDRLEN; 1661 m->m_data += PPP_HDRLEN; 1662 m->m_len -= PPP_HDRLEN; 1663 #ifdef GATEWAY 1664 if (ip6flow_fastforward(m)) 1665 return; 1666 #endif 1667 schednetisr(NETISR_IPV6); 1668 inq = &ip6intrq; 1669 break; 1670 #endif 1671 1672 default: 1673 /* 1674 * Some other protocol - place on input queue for read(). 1675 */ 1676 inq = &sc->sc_inq; 1677 rv = 1; 1678 break; 1679 } 1680 1681 /* 1682 * Put the packet on the appropriate input queue. 1683 */ 1684 s = splnet(); 1685 if (IF_QFULL(inq)) { 1686 IF_DROP(inq); 1687 splx(s); 1688 if (sc->sc_flags & SC_DEBUG) 1689 printf("%s: input queue full\n", ifp->if_xname); 1690 ifp->if_iqdrops++; 1691 goto bad; 1692 } 1693 IF_ENQUEUE(inq, m); 1694 splx(s); 1695 ifp->if_ipackets++; 1696 ifp->if_ibytes += ilen; 1697 1698 if (rv) 1699 (*sc->sc_ctlp)(sc); 1700 1701 return; 1702 1703 bad: 1704 m_freem(m); 1705 sc->sc_if.if_ierrors++; 1706 sc->sc_stats.ppp_ierrors++; 1707 } 1708 1709 #define MAX_DUMP_BYTES 128 1710 1711 static void 1712 pppdumpm(struct mbuf *m0) 1713 { 1714 char buf[3*MAX_DUMP_BYTES+4]; 1715 char *bp = buf; 1716 struct mbuf *m; 1717 1718 for (m = m0; m; m = m->m_next) { 1719 int l = m->m_len; 1720 u_char *rptr = (u_char *)m->m_data; 1721 1722 while (l--) { 1723 if (bp > buf + sizeof(buf) - 4) 1724 goto done; 1725 *bp++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */ 1726 *bp++ = hexdigits[*rptr++ & 0xf]; 1727 } 1728 1729 if (m->m_next) { 1730 if (bp > buf + sizeof(buf) - 3) 1731 goto done; 1732 *bp++ = '|'; 1733 } else 1734 *bp++ = ' '; 1735 } 1736 done: 1737 if (m) 1738 *bp++ = '>'; 1739 *bp = 0; 1740 printf("%s\n", buf); 1741 } 1742 1743 #ifdef ALTQ 1744 /* 1745 * a wrapper to transmit a packet from if_start since ALTQ uses 1746 * if_start to send a packet. 1747 */ 1748 static void 1749 ppp_ifstart(struct ifnet *ifp) 1750 { 1751 struct ppp_softc *sc; 1752 1753 sc = ifp->if_softc; 1754 (*sc->sc_start)(sc); 1755 } 1756 #endif 1757 1758 static const struct ppp_known_compressor { 1759 uint8_t code; 1760 const char *module; 1761 } ppp_known_compressors[] = { 1762 { CI_DEFLATE, "ppp_deflate" }, 1763 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1764 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1765 { CI_MPPE, "ppp_mppe" }, 1766 { 0, NULL } 1767 }; 1768 1769 static int 1770 ppp_compressor_init(void) 1771 { 1772 1773 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1774 return 0; 1775 } 1776 1777 static void 1778 ppp_compressor_rele(struct compressor *cp) 1779 { 1780 1781 mutex_enter(&ppp_compressors_mtx); 1782 --cp->comp_refcnt; 1783 mutex_exit(&ppp_compressors_mtx); 1784 } 1785 1786 static struct compressor * 1787 ppp_get_compressor_noload(uint8_t ci, bool hold) 1788 { 1789 struct compressor *cp; 1790 1791 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1792 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1793 if (cp->compress_proto == ci) { 1794 if (hold) 1795 ++cp->comp_refcnt; 1796 return cp; 1797 } 1798 } 1799 1800 return NULL; 1801 } 1802 1803 static struct compressor * 1804 ppp_get_compressor(uint8_t ci) 1805 { 1806 struct compressor *cp = NULL; 1807 const struct ppp_known_compressor *pkc; 1808 1809 mutex_enter(&ppp_compressors_mtx); 1810 cp = ppp_get_compressor_noload(ci, true); 1811 mutex_exit(&ppp_compressors_mtx); 1812 if (cp != NULL) 1813 return cp; 1814 1815 kernconfig_lock(); 1816 mutex_enter(&ppp_compressors_mtx); 1817 cp = ppp_get_compressor_noload(ci, true); 1818 mutex_exit(&ppp_compressors_mtx); 1819 if (cp == NULL) { 1820 /* Not found, so try to autoload a module */ 1821 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1822 if (pkc->code == ci) { 1823 if (module_autoload(pkc->module, 1824 MODULE_CLASS_MISC) != 0) 1825 break; 1826 mutex_enter(&ppp_compressors_mtx); 1827 cp = ppp_get_compressor_noload(ci, true); 1828 mutex_exit(&ppp_compressors_mtx); 1829 break; 1830 } 1831 } 1832 } 1833 kernconfig_unlock(); 1834 1835 return cp; 1836 } 1837 1838 int 1839 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1840 { 1841 int error = 0; 1842 size_t i; 1843 1844 RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); 1845 1846 mutex_enter(&ppp_compressors_mtx); 1847 for (i = 0; i < ncomp; i++) { 1848 if (ppp_get_compressor_noload(pc[i].compress_proto, 1849 false) != NULL) 1850 error = EEXIST; 1851 } 1852 if (!error) { 1853 for (i = 0; i < ncomp; i++) { 1854 pc[i].comp_refcnt = 0; 1855 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1856 } 1857 } 1858 mutex_exit(&ppp_compressors_mtx); 1859 1860 return error; 1861 } 1862 1863 int 1864 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1865 { 1866 int error = 0; 1867 size_t i; 1868 1869 mutex_enter(&ppp_compressors_mtx); 1870 for (i = 0; i < ncomp; i++) { 1871 if (ppp_get_compressor_noload(pc[i].compress_proto, 1872 false) != &pc[i]) 1873 error = ENOENT; 1874 else if (pc[i].comp_refcnt != 0) 1875 error = EBUSY; 1876 } 1877 if (!error) { 1878 for (i = 0; i < ncomp; i++) { 1879 LIST_REMOVE(&pc[i], comp_list); 1880 } 1881 } 1882 mutex_exit(&ppp_compressors_mtx); 1883 1884 return error; 1885 } 1886
Indexes created Fri Oct 03 02:09:57 GMT 2025