if_ppp.c revision 1.146.4.1
1 /* $NetBSD: if_ppp.c,v 1.146.4.1 2015/06/06 14:40:25 skrll 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 1.146.4.1 2015/06/06 14:40:25 skrll 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", 363 sc->sc_if.if_xname); 364 return (NULL); 365 } 366 sc->sc_flags = 0; 367 sc->sc_mru = PPP_MRU; 368 sc->sc_relinq = NULL; 369 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 370 #ifdef VJC 371 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 372 if (sc->sc_comp) 373 sl_compress_init(sc->sc_comp); 374 #endif 375 #ifdef PPP_COMPRESS 376 sc->sc_xc_state = NULL; 377 sc->sc_rc_state = NULL; 378 #endif /* PPP_COMPRESS */ 379 for (i = 0; i < NUM_NP; ++i) 380 sc->sc_npmode[i] = NPMODE_ERROR; 381 sc->sc_npqueue = NULL; 382 sc->sc_npqtail = &sc->sc_npqueue; 383 sc->sc_last_sent = sc->sc_last_recv = time_second; 384 385 return sc; 386 } 387 388 /* 389 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 390 */ 391 void 392 pppdealloc(struct ppp_softc *sc) 393 { 394 struct mbuf *m; 395 396 softint_disestablish(sc->sc_si); 397 if_down(&sc->sc_if); 398 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 399 sc->sc_devp = NULL; 400 sc->sc_xfer = 0; 401 for (;;) { 402 IF_DEQUEUE(&sc->sc_rawq, m); 403 if (m == NULL) 404 break; 405 m_freem(m); 406 } 407 for (;;) { 408 IF_DEQUEUE(&sc->sc_inq, m); 409 if (m == NULL) 410 break; 411 m_freem(m); 412 } 413 for (;;) { 414 IF_DEQUEUE(&sc->sc_fastq, m); 415 if (m == NULL) 416 break; 417 m_freem(m); 418 } 419 while ((m = sc->sc_npqueue) != NULL) { 420 sc->sc_npqueue = m->m_nextpkt; 421 m_freem(m); 422 } 423 if (sc->sc_togo != NULL) { 424 m_freem(sc->sc_togo); 425 sc->sc_togo = NULL; 426 } 427 #ifdef PPP_COMPRESS 428 ppp_ccp_closed(sc); 429 sc->sc_xc_state = NULL; 430 sc->sc_rc_state = NULL; 431 #endif /* PPP_COMPRESS */ 432 #ifdef PPP_FILTER 433 if (sc->sc_pass_filt_in.bf_insns != 0) { 434 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 435 sc->sc_pass_filt_in.bf_insns = 0; 436 sc->sc_pass_filt_in.bf_len = 0; 437 } 438 if (sc->sc_pass_filt_out.bf_insns != 0) { 439 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 440 sc->sc_pass_filt_out.bf_insns = 0; 441 sc->sc_pass_filt_out.bf_len = 0; 442 } 443 if (sc->sc_active_filt_in.bf_insns != 0) { 444 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 445 sc->sc_active_filt_in.bf_insns = 0; 446 sc->sc_active_filt_in.bf_len = 0; 447 } 448 if (sc->sc_active_filt_out.bf_insns != 0) { 449 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 450 sc->sc_active_filt_out.bf_insns = 0; 451 sc->sc_active_filt_out.bf_len = 0; 452 } 453 #endif /* PPP_FILTER */ 454 #ifdef VJC 455 if (sc->sc_comp != 0) { 456 free(sc->sc_comp, M_DEVBUF); 457 sc->sc_comp = 0; 458 } 459 #endif 460 (void)ppp_clone_destroy(&sc->sc_if); 461 } 462 463 /* 464 * Ioctl routine for generic ppp devices. 465 */ 466 int 467 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 468 struct lwp *l) 469 { 470 int s, error, flags, mru, npx; 471 u_int nb; 472 struct ppp_option_data *odp; 473 struct compressor *cp; 474 struct npioctl *npi; 475 time_t t; 476 #ifdef PPP_FILTER 477 struct bpf_program *bp, *nbp; 478 struct bpf_insn *newcode, *oldcode; 479 int newcodelen; 480 #endif /* PPP_FILTER */ 481 #ifdef PPP_COMPRESS 482 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 483 #endif 484 485 switch (cmd) { 486 case PPPIOCSFLAGS: 487 case PPPIOCSMRU: 488 case PPPIOCSMAXCID: 489 case PPPIOCSCOMPRESS: 490 case PPPIOCSNPMODE: 491 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 492 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, 493 KAUTH_ARG(cmd), NULL) != 0) 494 return (EPERM); 495 break; 496 case PPPIOCXFERUNIT: 497 /* XXX: Why is this privileged?! */ 498 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 499 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, 500 KAUTH_ARG(cmd), NULL) != 0) 501 return (EPERM); 502 break; 503 default: 504 break; 505 } 506 507 switch (cmd) { 508 case FIONREAD: 509 *(int *)data = sc->sc_inq.ifq_len; 510 break; 511 512 case PPPIOCGUNIT: 513 *(int *)data = sc->sc_unit; 514 break; 515 516 case PPPIOCGFLAGS: 517 *(u_int *)data = sc->sc_flags; 518 break; 519 520 case PPPIOCGRAWIN: 521 { 522 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 523 u_char c, q = 0; 524 525 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 526 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 527 528 for (c = 0; c < sc->sc_rawin_start;) 529 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 530 531 rwin->count = sc->sc_rawin.count; 532 } 533 break; 534 535 case PPPIOCSFLAGS: 536 flags = *(int *)data & SC_MASK; 537 s = splsoftnet(); 538 #ifdef PPP_COMPRESS 539 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 540 ppp_ccp_closed(sc); 541 #endif 542 splhigh(); /* XXX IMP ME HARDER */ 543 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 544 splx(s); 545 break; 546 547 case PPPIOCSMRU: 548 mru = *(int *)data; 549 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 550 sc->sc_mru = mru; 551 break; 552 553 case PPPIOCGMRU: 554 *(int *)data = sc->sc_mru; 555 break; 556 557 #ifdef VJC 558 case PPPIOCSMAXCID: 559 if (sc->sc_comp) { 560 s = splsoftnet(); 561 sl_compress_setup(sc->sc_comp, *(int *)data); 562 splx(s); 563 } 564 break; 565 #endif 566 567 case PPPIOCXFERUNIT: 568 sc->sc_xfer = l->l_proc->p_pid; 569 break; 570 571 #ifdef PPP_COMPRESS 572 case PPPIOCSCOMPRESS: 573 odp = (struct ppp_option_data *) data; 574 nb = odp->length; 575 if (nb > sizeof(ccp_option)) 576 nb = sizeof(ccp_option); 577 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 578 return (error); 579 /* preliminary check on the length byte */ 580 if (ccp_option[1] < 2) 581 return (EINVAL); 582 cp = ppp_get_compressor(ccp_option[0]); 583 if (cp == NULL) { 584 if (sc->sc_flags & SC_DEBUG) 585 printf("%s: no compressor for [%x %x %x], %x\n", 586 sc->sc_if.if_xname, ccp_option[0], 587 ccp_option[1], ccp_option[2], nb); 588 return (EINVAL); /* no handler found */ 589 } 590 /* 591 * Found a handler for the protocol - try to allocate 592 * a compressor or decompressor. 593 */ 594 error = 0; 595 if (odp->transmit) { 596 s = splsoftnet(); 597 if (sc->sc_xc_state != NULL) { 598 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 599 ppp_compressor_rele(sc->sc_xcomp); 600 } 601 sc->sc_xcomp = cp; 602 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 603 if (sc->sc_xc_state == NULL) { 604 if (sc->sc_flags & SC_DEBUG) 605 printf("%s: comp_alloc failed\n", 606 sc->sc_if.if_xname); 607 error = ENOBUFS; 608 } 609 splhigh(); /* XXX IMP ME HARDER */ 610 sc->sc_flags &= ~SC_COMP_RUN; 611 splx(s); 612 } else { 613 s = splsoftnet(); 614 if (sc->sc_rc_state != NULL) { 615 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 616 ppp_compressor_rele(sc->sc_rcomp); 617 } 618 sc->sc_rcomp = cp; 619 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 620 if (sc->sc_rc_state == NULL) { 621 if (sc->sc_flags & SC_DEBUG) 622 printf("%s: decomp_alloc failed\n", 623 sc->sc_if.if_xname); 624 error = ENOBUFS; 625 } 626 splhigh(); /* XXX IMP ME HARDER */ 627 sc->sc_flags &= ~SC_DECOMP_RUN; 628 splx(s); 629 } 630 return (error); 631 #endif /* PPP_COMPRESS */ 632 633 case PPPIOCGNPMODE: 634 case PPPIOCSNPMODE: 635 npi = (struct npioctl *) data; 636 switch (npi->protocol) { 637 case PPP_IP: 638 npx = NP_IP; 639 break; 640 case PPP_IPV6: 641 npx = NP_IPV6; 642 break; 643 default: 644 return EINVAL; 645 } 646 if (cmd == PPPIOCGNPMODE) { 647 npi->mode = sc->sc_npmode[npx]; 648 } else { 649 if (npi->mode != sc->sc_npmode[npx]) { 650 s = splnet(); 651 sc->sc_npmode[npx] = npi->mode; 652 if (npi->mode != NPMODE_QUEUE) { 653 ppp_requeue(sc); 654 ppp_restart(sc); 655 } 656 splx(s); 657 } 658 } 659 break; 660 661 case PPPIOCGIDLE: 662 s = splsoftnet(); 663 t = time_second; 664 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 665 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 666 splx(s); 667 break; 668 669 #ifdef PPP_FILTER 670 case PPPIOCSPASS: 671 case PPPIOCSACTIVE: 672 /* These are no longer supported. */ 673 return EOPNOTSUPP; 674 675 case PPPIOCSIPASS: 676 case PPPIOCSOPASS: 677 case PPPIOCSIACTIVE: 678 case PPPIOCSOACTIVE: 679 nbp = (struct bpf_program *) data; 680 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 681 return EINVAL; 682 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 683 if (newcodelen != 0) { 684 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 685 /* WAITOK -- malloc() never fails. */ 686 if ((error = copyin((void *)nbp->bf_insns, 687 (void *)newcode, newcodelen)) != 0) { 688 free(newcode, M_DEVBUF); 689 return error; 690 } 691 if (!bpf_validate(newcode, nbp->bf_len)) { 692 free(newcode, M_DEVBUF); 693 return EINVAL; 694 } 695 } else 696 newcode = 0; 697 switch (cmd) { 698 case PPPIOCSIPASS: 699 bp = &sc->sc_pass_filt_in; 700 break; 701 702 case PPPIOCSOPASS: 703 bp = &sc->sc_pass_filt_out; 704 break; 705 706 case PPPIOCSIACTIVE: 707 bp = &sc->sc_active_filt_in; 708 break; 709 710 case PPPIOCSOACTIVE: 711 bp = &sc->sc_active_filt_out; 712 break; 713 default: 714 free(newcode, M_DEVBUF); 715 return (EPASSTHROUGH); 716 } 717 oldcode = bp->bf_insns; 718 s = splnet(); 719 bp->bf_len = nbp->bf_len; 720 bp->bf_insns = newcode; 721 splx(s); 722 if (oldcode != 0) 723 free(oldcode, M_DEVBUF); 724 break; 725 #endif /* PPP_FILTER */ 726 727 default: 728 return (EPASSTHROUGH); 729 } 730 return (0); 731 } 732 733 /* 734 * Process an ioctl request to the ppp network interface. 735 */ 736 static int 737 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 738 { 739 struct ppp_softc *sc = ifp->if_softc; 740 struct ifaddr *ifa = (struct ifaddr *)data; 741 struct ifreq *ifr = (struct ifreq *)data; 742 struct ppp_stats *psp; 743 #ifdef PPP_COMPRESS 744 struct ppp_comp_stats *pcp; 745 #endif 746 int s = splnet(), error = 0; 747 748 switch (cmd) { 749 case SIOCSIFFLAGS: 750 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 751 break; 752 if ((ifp->if_flags & IFF_RUNNING) == 0) 753 ifp->if_flags &= ~IFF_UP; 754 break; 755 756 case SIOCINITIFADDR: 757 switch (ifa->ifa_addr->sa_family) { 758 #ifdef INET 759 case AF_INET: 760 break; 761 #endif 762 #ifdef INET6 763 case AF_INET6: 764 break; 765 #endif 766 default: 767 error = EAFNOSUPPORT; 768 break; 769 } 770 ifa->ifa_rtrequest = p2p_rtrequest; 771 break; 772 773 case SIOCADDMULTI: 774 case SIOCDELMULTI: 775 if (ifr == NULL) { 776 error = EAFNOSUPPORT; 777 break; 778 } 779 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 780 #ifdef INET 781 case AF_INET: 782 break; 783 #endif 784 #ifdef INET6 785 case AF_INET6: 786 break; 787 #endif 788 default: 789 error = EAFNOSUPPORT; 790 break; 791 } 792 break; 793 794 case SIOCGPPPSTATS: 795 psp = &((struct ifpppstatsreq *) data)->stats; 796 memset(psp, 0, sizeof(*psp)); 797 psp->p = sc->sc_stats; 798 #if defined(VJC) && !defined(SL_NO_STATS) 799 if (sc->sc_comp) { 800 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 801 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 802 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 803 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 804 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 805 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 806 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 807 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 808 } 809 #endif /* VJC */ 810 break; 811 812 #ifdef PPP_COMPRESS 813 case SIOCGPPPCSTATS: 814 pcp = &((struct ifpppcstatsreq *) data)->stats; 815 memset(pcp, 0, sizeof(*pcp)); 816 if (sc->sc_xc_state != NULL) 817 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 818 if (sc->sc_rc_state != NULL) 819 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 820 break; 821 #endif /* PPP_COMPRESS */ 822 823 default: 824 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 825 error = 0; 826 break; 827 } 828 splx(s); 829 return (error); 830 } 831 832 /* 833 * Queue a packet. Start transmission if not active. 834 * Packet is placed in Information field of PPP frame. 835 */ 836 int 837 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 838 struct rtentry *rtp) 839 { 840 struct ppp_softc *sc = ifp->if_softc; 841 int protocol, address, control; 842 u_char *cp; 843 int s, error; 844 #ifdef INET 845 struct ip *ip; 846 #endif 847 struct ifqueue *ifq; 848 enum NPmode mode; 849 int len; 850 ALTQ_DECL(struct altq_pktattr pktattr;) 851 852 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 853 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 854 error = ENETDOWN; /* sort of */ 855 goto bad; 856 } 857 858 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 859 860 /* 861 * Compute PPP header. 862 */ 863 m0->m_flags &= ~M_HIGHPRI; 864 switch (dst->sa_family) { 865 #ifdef INET 866 case AF_INET: 867 address = PPP_ALLSTATIONS; 868 control = PPP_UI; 869 protocol = PPP_IP; 870 mode = sc->sc_npmode[NP_IP]; 871 872 /* 873 * If this packet has the "low delay" bit set in the IP header, 874 * put it on the fastq instead. 875 */ 876 ip = mtod(m0, struct ip *); 877 if (ip->ip_tos & IPTOS_LOWDELAY) 878 m0->m_flags |= M_HIGHPRI; 879 break; 880 #endif 881 #ifdef INET6 882 case AF_INET6: 883 address = PPP_ALLSTATIONS; /*XXX*/ 884 control = PPP_UI; /*XXX*/ 885 protocol = PPP_IPV6; 886 mode = sc->sc_npmode[NP_IPV6]; 887 888 #if 0 /* XXX flowinfo/traffic class, maybe? */ 889 /* 890 * If this packet has the "low delay" bit set in the IP header, 891 * put it on the fastq instead. 892 */ 893 ip = mtod(m0, struct ip *); 894 if (ip->ip_tos & IPTOS_LOWDELAY) 895 m0->m_flags |= M_HIGHPRI; 896 #endif 897 break; 898 #endif 899 case AF_UNSPEC: 900 address = PPP_ADDRESS(dst->sa_data); 901 control = PPP_CONTROL(dst->sa_data); 902 protocol = PPP_PROTOCOL(dst->sa_data); 903 mode = NPMODE_PASS; 904 break; 905 default: 906 printf("%s: af%d not supported\n", ifp->if_xname, 907 dst->sa_family); 908 error = EAFNOSUPPORT; 909 goto bad; 910 } 911 912 /* 913 * Drop this packet, or return an error, if necessary. 914 */ 915 if (mode == NPMODE_ERROR) { 916 error = ENETDOWN; 917 goto bad; 918 } 919 if (mode == NPMODE_DROP) { 920 error = 0; 921 goto bad; 922 } 923 924 /* 925 * Add PPP header. 926 */ 927 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 928 if (m0 == NULL) { 929 error = ENOBUFS; 930 goto bad; 931 } 932 933 cp = mtod(m0, u_char *); 934 *cp++ = address; 935 *cp++ = control; 936 *cp++ = protocol >> 8; 937 *cp++ = protocol & 0xff; 938 939 len = m_length(m0); 940 941 if (sc->sc_flags & SC_LOG_OUTPKT) { 942 printf("%s output: ", ifp->if_xname); 943 pppdumpm(m0); 944 } 945 946 if ((protocol & 0x8000) == 0) { 947 #ifdef PPP_FILTER 948 /* 949 * Apply the pass and active filters to the packet, 950 * but only if it is a data packet. 951 */ 952 if (sc->sc_pass_filt_out.bf_insns != 0 953 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 954 (u_char *)m0, len, 0) == 0) { 955 error = 0; /* drop this packet */ 956 goto bad; 957 } 958 959 /* 960 * Update the time we sent the most recent packet. 961 */ 962 if (sc->sc_active_filt_out.bf_insns == 0 963 || bpf_filter(sc->sc_active_filt_out.bf_insns, 964 (u_char *)m0, len, 0)) 965 sc->sc_last_sent = time_second; 966 #else 967 /* 968 * Update the time we sent the most recent packet. 969 */ 970 sc->sc_last_sent = time_second; 971 #endif /* PPP_FILTER */ 972 } 973 974 /* 975 * See if bpf wants to look at the packet. 976 */ 977 bpf_mtap(&sc->sc_if, m0); 978 979 /* 980 * Put the packet on the appropriate queue. 981 */ 982 s = splnet(); 983 if (mode == NPMODE_QUEUE) { 984 /* XXX we should limit the number of packets on this queue */ 985 *sc->sc_npqtail = m0; 986 m0->m_nextpkt = NULL; 987 sc->sc_npqtail = &m0->m_nextpkt; 988 } else { 989 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 990 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 991 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { 992 splx(s); 993 sc->sc_if.if_oerrors++; 994 sc->sc_stats.ppp_oerrors++; 995 return (error); 996 } 997 ppp_restart(sc); 998 } 999 ifp->if_opackets++; 1000 ifp->if_obytes += len; 1001 1002 splx(s); 1003 return (0); 1004 1005 bad: 1006 m_freem(m0); 1007 return (error); 1008 } 1009 1010 /* 1011 * After a change in the NPmode for some NP, move packets from the 1012 * npqueue to the send queue or the fast queue as appropriate. 1013 * Should be called at splnet, since we muck with the queues. 1014 */ 1015 static void 1016 ppp_requeue(struct ppp_softc *sc) 1017 { 1018 struct mbuf *m, **mpp; 1019 struct ifqueue *ifq; 1020 enum NPmode mode; 1021 int error; 1022 1023 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1024 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1025 case PPP_IP: 1026 mode = sc->sc_npmode[NP_IP]; 1027 break; 1028 case PPP_IPV6: 1029 mode = sc->sc_npmode[NP_IPV6]; 1030 break; 1031 default: 1032 mode = NPMODE_PASS; 1033 } 1034 1035 switch (mode) { 1036 case NPMODE_PASS: 1037 /* 1038 * This packet can now go on one of the queues to 1039 * be sent. 1040 */ 1041 *mpp = m->m_nextpkt; 1042 m->m_nextpkt = NULL; 1043 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1044 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA 1045 ALTQ_DECL(NULL))) != 0) { 1046 sc->sc_if.if_oerrors++; 1047 sc->sc_stats.ppp_oerrors++; 1048 } 1049 break; 1050 1051 case NPMODE_DROP: 1052 case NPMODE_ERROR: 1053 *mpp = m->m_nextpkt; 1054 m_freem(m); 1055 break; 1056 1057 case NPMODE_QUEUE: 1058 mpp = &m->m_nextpkt; 1059 break; 1060 } 1061 } 1062 sc->sc_npqtail = mpp; 1063 } 1064 1065 /* 1066 * Transmitter has finished outputting some stuff; 1067 * remember to call sc->sc_start later at splsoftnet. 1068 */ 1069 void 1070 ppp_restart(struct ppp_softc *sc) 1071 { 1072 int s = splhigh(); /* XXX IMP ME HARDER */ 1073 1074 sc->sc_flags &= ~SC_TBUSY; 1075 softint_schedule(sc->sc_si); 1076 splx(s); 1077 } 1078 1079 /* 1080 * Get a packet to send. This procedure is intended to be called at 1081 * splsoftnet, since it may involve time-consuming operations such as 1082 * applying VJ compression, packet compression, address/control and/or 1083 * protocol field compression to the packet. 1084 */ 1085 struct mbuf * 1086 ppp_dequeue(struct ppp_softc *sc) 1087 { 1088 struct mbuf *m, *mp; 1089 u_char *cp; 1090 int address, control, protocol; 1091 int s; 1092 1093 /* 1094 * Grab a packet to send: first try the fast queue, then the 1095 * normal queue. 1096 */ 1097 s = splnet(); 1098 if (sc->sc_nfastq < sc->sc_maxfastq) { 1099 IF_DEQUEUE(&sc->sc_fastq, m); 1100 if (m != NULL) 1101 sc->sc_nfastq++; 1102 else 1103 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1104 } else { 1105 sc->sc_nfastq = 0; 1106 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1107 if (m == NULL) { 1108 IF_DEQUEUE(&sc->sc_fastq, m); 1109 if (m != NULL) 1110 sc->sc_nfastq++; 1111 } 1112 } 1113 splx(s); 1114 1115 if (m == NULL) 1116 return NULL; 1117 1118 ++sc->sc_stats.ppp_opackets; 1119 1120 /* 1121 * Extract the ppp header of the new packet. 1122 * The ppp header will be in one mbuf. 1123 */ 1124 cp = mtod(m, u_char *); 1125 address = PPP_ADDRESS(cp); 1126 control = PPP_CONTROL(cp); 1127 protocol = PPP_PROTOCOL(cp); 1128 1129 switch (protocol) { 1130 case PPP_IP: 1131 #ifdef VJC 1132 /* 1133 * If the packet is a TCP/IP packet, see if we can compress it. 1134 */ 1135 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1136 struct ip *ip; 1137 int type; 1138 1139 mp = m; 1140 ip = (struct ip *) (cp + PPP_HDRLEN); 1141 if (mp->m_len <= PPP_HDRLEN) { 1142 mp = mp->m_next; 1143 if (mp == NULL) 1144 break; 1145 ip = mtod(mp, struct ip *); 1146 } 1147 /* 1148 * This code assumes the IP/TCP header is in one 1149 * non-shared mbuf 1150 */ 1151 if (ip->ip_p == IPPROTO_TCP) { 1152 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1153 !(sc->sc_flags & SC_NO_TCP_CCID)); 1154 switch (type) { 1155 case TYPE_UNCOMPRESSED_TCP: 1156 protocol = PPP_VJC_UNCOMP; 1157 break; 1158 case TYPE_COMPRESSED_TCP: 1159 protocol = PPP_VJC_COMP; 1160 cp = mtod(m, u_char *); 1161 cp[0] = address; /* Header has moved */ 1162 cp[1] = control; 1163 cp[2] = 0; 1164 break; 1165 } 1166 /* Update protocol in PPP header */ 1167 cp[3] = protocol; 1168 } 1169 } 1170 #endif /* VJC */ 1171 break; 1172 1173 #ifdef PPP_COMPRESS 1174 case PPP_CCP: 1175 ppp_ccp(sc, m, 0); 1176 break; 1177 #endif /* PPP_COMPRESS */ 1178 } 1179 1180 #ifdef PPP_COMPRESS 1181 if (protocol != PPP_LCP && protocol != PPP_CCP 1182 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1183 struct mbuf *mcomp = NULL; 1184 int slen; 1185 1186 slen = 0; 1187 for (mp = m; mp != NULL; mp = mp->m_next) 1188 slen += mp->m_len; 1189 (*sc->sc_xcomp->compress) 1190 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1191 if (mcomp != NULL) { 1192 if (sc->sc_flags & SC_CCP_UP) { 1193 /* 1194 * Send the compressed packet instead of the 1195 * original. 1196 */ 1197 m_freem(m); 1198 m = mcomp; 1199 cp = mtod(m, u_char *); 1200 protocol = cp[3]; 1201 } else { 1202 /* 1203 * Can't transmit compressed packets until CCP 1204 * is up. 1205 */ 1206 m_freem(mcomp); 1207 } 1208 } 1209 } 1210 #endif /* PPP_COMPRESS */ 1211 1212 /* 1213 * Compress the address/control and protocol, if possible. 1214 */ 1215 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1216 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1217 protocol != PPP_LCP) { 1218 /* can compress address/control */ 1219 m->m_data += 2; 1220 m->m_len -= 2; 1221 } 1222 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1223 /* can compress protocol */ 1224 if (mtod(m, u_char *) == cp) { 1225 cp[2] = cp[1]; /* move address/control up */ 1226 cp[1] = cp[0]; 1227 } 1228 ++m->m_data; 1229 --m->m_len; 1230 } 1231 1232 return m; 1233 } 1234 1235 /* 1236 * Software interrupt routine, called at splsoftnet. 1237 */ 1238 static void 1239 pppintr(void *arg) 1240 { 1241 struct ppp_softc *sc = arg; 1242 struct mbuf *m; 1243 int s; 1244 1245 mutex_enter(softnet_lock); 1246 if (!(sc->sc_flags & SC_TBUSY) 1247 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1248 || sc->sc_outm)) { 1249 s = splhigh(); /* XXX IMP ME HARDER */ 1250 sc->sc_flags |= SC_TBUSY; 1251 splx(s); 1252 (*sc->sc_start)(sc); 1253 } 1254 for (;;) { 1255 s = splnet(); 1256 IF_DEQUEUE(&sc->sc_rawq, m); 1257 splx(s); 1258 if (m == NULL) 1259 break; 1260 ppp_inproc(sc, m); 1261 } 1262 mutex_exit(softnet_lock); 1263 } 1264 1265 #ifdef PPP_COMPRESS 1266 /* 1267 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1268 * 0 if it is about to be transmitted. 1269 */ 1270 static void 1271 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1272 { 1273 u_char *dp, *ep; 1274 struct mbuf *mp; 1275 int slen, s; 1276 1277 /* 1278 * Get a pointer to the data after the PPP header. 1279 */ 1280 if (m->m_len <= PPP_HDRLEN) { 1281 mp = m->m_next; 1282 if (mp == NULL) 1283 return; 1284 dp = mtod(mp, u_char *); 1285 } else { 1286 mp = m; 1287 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1288 } 1289 1290 ep = mtod(mp, u_char *) + mp->m_len; 1291 if (dp + CCP_HDRLEN > ep) 1292 return; 1293 slen = CCP_LENGTH(dp); 1294 if (dp + slen > ep) { 1295 if (sc->sc_flags & SC_DEBUG) 1296 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1297 dp, slen, mtod(mp, u_char *), mp->m_len); 1298 return; 1299 } 1300 1301 switch (CCP_CODE(dp)) { 1302 case CCP_CONFREQ: 1303 case CCP_TERMREQ: 1304 case CCP_TERMACK: 1305 /* CCP must be going down - disable compression */ 1306 if (sc->sc_flags & SC_CCP_UP) { 1307 s = splhigh(); /* XXX IMP ME HARDER */ 1308 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1309 splx(s); 1310 } 1311 break; 1312 1313 case CCP_CONFACK: 1314 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1315 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1316 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1317 if (!rcvd) { 1318 /* We're agreeing to send compressed packets. */ 1319 if (sc->sc_xc_state != NULL 1320 && (*sc->sc_xcomp->comp_init) 1321 (sc->sc_xc_state, dp + CCP_HDRLEN, 1322 slen - CCP_HDRLEN, sc->sc_unit, 0, 1323 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 /* 1330 * Peer is agreeing to send compressed 1331 * packets. 1332 */ 1333 if (sc->sc_rc_state != NULL 1334 && (*sc->sc_rcomp->decomp_init) 1335 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1336 sc->sc_unit, 0, sc->sc_mru, 1337 sc->sc_flags & SC_DEBUG)) { 1338 s = splhigh(); /* XXX IMP ME HARDER */ 1339 sc->sc_flags |= SC_DECOMP_RUN; 1340 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1341 splx(s); 1342 } 1343 } 1344 } 1345 break; 1346 1347 case CCP_RESETACK: 1348 if (sc->sc_flags & SC_CCP_UP) { 1349 if (!rcvd) { 1350 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1351 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1352 } else { 1353 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1354 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1355 s = splhigh(); /* XXX IMP ME HARDER */ 1356 sc->sc_flags &= ~SC_DC_ERROR; 1357 splx(s); 1358 } 1359 } 1360 } 1361 break; 1362 } 1363 } 1364 1365 /* 1366 * CCP is down; free (de)compressor state if necessary. 1367 */ 1368 static void 1369 ppp_ccp_closed(struct ppp_softc *sc) 1370 { 1371 if (sc->sc_xc_state) { 1372 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1373 ppp_compressor_rele(sc->sc_xcomp); 1374 sc->sc_xc_state = NULL; 1375 } 1376 if (sc->sc_rc_state) { 1377 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1378 ppp_compressor_rele(sc->sc_rcomp); 1379 sc->sc_rc_state = NULL; 1380 } 1381 } 1382 #endif /* PPP_COMPRESS */ 1383 1384 /* 1385 * PPP packet input routine. 1386 * The caller has checked and removed the FCS and has inserted 1387 * the address/control bytes and the protocol high byte if they 1388 * were omitted. 1389 */ 1390 void 1391 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1392 { 1393 int s = splhigh(); /* XXX IMP ME HARDER */ 1394 1395 if (lost) 1396 m->m_flags |= M_ERRMARK; 1397 IF_ENQUEUE(&sc->sc_rawq, m); 1398 softint_schedule(sc->sc_si); 1399 splx(s); 1400 } 1401 1402 /* 1403 * Process a received PPP packet, doing decompression as necessary. 1404 * Should be called at splsoftnet. 1405 */ 1406 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP: \ 1407 TYPE_UNCOMPRESSED_TCP) 1408 1409 static void 1410 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1411 { 1412 struct ifnet *ifp = &sc->sc_if; 1413 pktqueue_t *pktq = NULL; 1414 struct ifqueue *inq = NULL; 1415 int s, ilen, proto, rv; 1416 u_char *cp, adrs, ctrl; 1417 struct mbuf *mp, *dmp = NULL; 1418 #ifdef VJC 1419 int xlen; 1420 u_char *iphdr; 1421 u_int hlen; 1422 #endif 1423 1424 sc->sc_stats.ppp_ipackets++; 1425 1426 if (sc->sc_flags & SC_LOG_INPKT) { 1427 ilen = 0; 1428 for (mp = m; mp != NULL; mp = mp->m_next) 1429 ilen += mp->m_len; 1430 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1431 pppdumpm(m); 1432 } 1433 1434 cp = mtod(m, u_char *); 1435 adrs = PPP_ADDRESS(cp); 1436 ctrl = PPP_CONTROL(cp); 1437 proto = PPP_PROTOCOL(cp); 1438 1439 if (m->m_flags & M_ERRMARK) { 1440 m->m_flags &= ~M_ERRMARK; 1441 s = splhigh(); /* XXX IMP ME HARDER */ 1442 sc->sc_flags |= SC_VJ_RESET; 1443 splx(s); 1444 } 1445 1446 #ifdef PPP_COMPRESS 1447 /* 1448 * Decompress this packet if necessary, update the receiver's 1449 * dictionary, or take appropriate action on a CCP packet. 1450 */ 1451 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1452 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1453 /* Decompress this packet */ 1454 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1455 if (rv == DECOMP_OK) { 1456 m_freem(m); 1457 if (dmp == NULL) { 1458 /* 1459 * No error, but no decompressed packet 1460 * produced 1461 */ 1462 return; 1463 } 1464 m = dmp; 1465 cp = mtod(m, u_char *); 1466 proto = PPP_PROTOCOL(cp); 1467 1468 } else { 1469 /* 1470 * An error has occurred in decompression. 1471 * Pass the compressed packet up to pppd, which may 1472 * take CCP down or issue a Reset-Req. 1473 */ 1474 if (sc->sc_flags & SC_DEBUG) 1475 printf("%s: decompress failed %d\n", 1476 ifp->if_xname, rv); 1477 s = splhigh(); /* XXX IMP ME HARDER */ 1478 sc->sc_flags |= SC_VJ_RESET; 1479 if (rv == DECOMP_ERROR) 1480 sc->sc_flags |= SC_DC_ERROR; 1481 else 1482 sc->sc_flags |= SC_DC_FERROR; 1483 splx(s); 1484 } 1485 1486 } else { 1487 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) 1488 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1489 if (proto == PPP_CCP) 1490 ppp_ccp(sc, m, 1); 1491 } 1492 #endif 1493 1494 ilen = 0; 1495 for (mp = m; mp != NULL; mp = mp->m_next) 1496 ilen += mp->m_len; 1497 1498 #ifdef VJC 1499 if (sc->sc_flags & SC_VJ_RESET) { 1500 /* 1501 * If we've missed a packet, we must toss subsequent compressed 1502 * packets which don't have an explicit connection ID. 1503 */ 1504 if (sc->sc_comp) 1505 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1506 s = splhigh(); /* XXX IMP ME HARDER */ 1507 sc->sc_flags &= ~SC_VJ_RESET; 1508 splx(s); 1509 } 1510 1511 /* 1512 * See if we have a VJ-compressed packet to uncompress. 1513 */ 1514 if (proto == PPP_VJC_COMP) { 1515 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1516 goto bad; 1517 1518 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1519 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1520 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1521 1522 if (xlen <= 0) { 1523 if (sc->sc_flags & SC_DEBUG) 1524 printf("%s: VJ uncompress failed on type comp\n", 1525 ifp->if_xname); 1526 goto bad; 1527 } 1528 1529 /* Copy the PPP and IP headers into a new mbuf. */ 1530 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1531 if (mp == NULL) 1532 goto bad; 1533 mp->m_len = 0; 1534 mp->m_next = NULL; 1535 if (hlen + PPP_HDRLEN > MHLEN) { 1536 MCLGET(mp, M_DONTWAIT); 1537 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1538 /* Lose if big headers and no clusters */ 1539 m_freem(mp); 1540 goto bad; 1541 } 1542 } 1543 cp = mtod(mp, u_char *); 1544 cp[0] = adrs; 1545 cp[1] = ctrl; 1546 cp[2] = 0; 1547 cp[3] = PPP_IP; 1548 proto = PPP_IP; 1549 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1550 mp->m_len = hlen + PPP_HDRLEN; 1551 1552 /* 1553 * Trim the PPP and VJ headers off the old mbuf 1554 * and stick the new and old mbufs together. 1555 */ 1556 m->m_data += PPP_HDRLEN + xlen; 1557 m->m_len -= PPP_HDRLEN + xlen; 1558 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1559 bcopy(mtod(m, u_char *), 1560 mtod(mp, u_char *) + mp->m_len, m->m_len); 1561 mp->m_len += m->m_len; 1562 MFREE(m, mp->m_next); 1563 } else 1564 mp->m_next = m; 1565 m = mp; 1566 ilen += hlen - xlen; 1567 1568 } else if (proto == PPP_VJC_UNCOMP) { 1569 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1570 goto bad; 1571 1572 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, 1573 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, 1574 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); 1575 1576 if (xlen < 0) { 1577 if (sc->sc_flags & SC_DEBUG) 1578 printf("%s: VJ uncompress failed on type uncomp\n", 1579 ifp->if_xname); 1580 goto bad; 1581 } 1582 1583 proto = PPP_IP; 1584 cp[3] = PPP_IP; 1585 } 1586 #endif /* VJC */ 1587 1588 /* 1589 * If the packet will fit in a header mbuf, don't waste a 1590 * whole cluster on it. 1591 */ 1592 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1593 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1594 if (mp != NULL) { 1595 m_copydata(m, 0, ilen, mtod(mp, void *)); 1596 m_freem(m); 1597 m = mp; 1598 m->m_len = ilen; 1599 } 1600 } 1601 m->m_pkthdr.len = ilen; 1602 m->m_pkthdr.rcvif = ifp; 1603 1604 if ((proto & 0x8000) == 0) { 1605 #ifdef PPP_FILTER 1606 /* 1607 * See whether we want to pass this packet, and 1608 * if it counts as link activity. 1609 */ 1610 if (sc->sc_pass_filt_in.bf_insns != 0 1611 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1612 (u_char *)m, ilen, 0) == 0) { 1613 /* drop this packet */ 1614 m_freem(m); 1615 return; 1616 } 1617 if (sc->sc_active_filt_in.bf_insns == 0 1618 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1619 (u_char *)m, ilen, 0)) 1620 sc->sc_last_recv = time_second; 1621 #else 1622 /* 1623 * Record the time that we received this packet. 1624 */ 1625 sc->sc_last_recv = time_second; 1626 #endif /* PPP_FILTER */ 1627 } 1628 1629 /* See if bpf wants to look at the packet. */ 1630 bpf_mtap(&sc->sc_if, m); 1631 1632 switch (proto) { 1633 #ifdef INET 1634 case PPP_IP: 1635 /* 1636 * IP packet - take off the ppp header and pass it up to IP. 1637 */ 1638 if ((ifp->if_flags & IFF_UP) == 0 1639 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1640 /* Interface is down - drop the packet. */ 1641 m_freem(m); 1642 return; 1643 } 1644 m->m_pkthdr.len -= PPP_HDRLEN; 1645 m->m_data += PPP_HDRLEN; 1646 m->m_len -= PPP_HDRLEN; 1647 #ifdef GATEWAY 1648 if (ipflow_fastforward(m)) 1649 return; 1650 #endif 1651 pktq = ip_pktq; 1652 break; 1653 #endif 1654 1655 #ifdef INET6 1656 case PPP_IPV6: 1657 /* 1658 * IPv6 packet - take off the ppp header and pass it up to 1659 * IPv6. 1660 */ 1661 if ((ifp->if_flags & IFF_UP) == 0 1662 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1663 /* interface is down - drop the packet. */ 1664 m_freem(m); 1665 return; 1666 } 1667 m->m_pkthdr.len -= PPP_HDRLEN; 1668 m->m_data += PPP_HDRLEN; 1669 m->m_len -= PPP_HDRLEN; 1670 #ifdef GATEWAY 1671 if (ip6flow_fastforward(&m)) 1672 return; 1673 #endif 1674 pktq = ip6_pktq; 1675 break; 1676 #endif 1677 1678 default: 1679 /* 1680 * Some other protocol - place on input queue for read(). 1681 */ 1682 inq = &sc->sc_inq; 1683 pktq = NULL; 1684 break; 1685 } 1686 1687 /* 1688 * Put the packet on the appropriate input queue. 1689 */ 1690 s = splnet(); 1691 1692 /* pktq: inet or inet6 cases */ 1693 if (__predict_true(pktq)) { 1694 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 1695 ifp->if_iqdrops++; 1696 goto bad; 1697 } 1698 ifp->if_ipackets++; 1699 ifp->if_ibytes += ilen; 1700 splx(s); 1701 return; 1702 } 1703 1704 /* ifq: other protocol cases */ 1705 if (!inq) { 1706 goto bad; 1707 } 1708 if (IF_QFULL(inq)) { 1709 IF_DROP(inq); 1710 splx(s); 1711 if (sc->sc_flags & SC_DEBUG) 1712 printf("%s: input queue full\n", ifp->if_xname); 1713 ifp->if_iqdrops++; 1714 goto bad; 1715 } 1716 IF_ENQUEUE(inq, m); 1717 splx(s); 1718 ifp->if_ipackets++; 1719 ifp->if_ibytes += ilen; 1720 1721 (*sc->sc_ctlp)(sc); 1722 1723 return; 1724 1725 bad: 1726 m_freem(m); 1727 sc->sc_if.if_ierrors++; 1728 sc->sc_stats.ppp_ierrors++; 1729 } 1730 1731 #define MAX_DUMP_BYTES 128 1732 1733 static void 1734 pppdumpm(struct mbuf *m0) 1735 { 1736 char buf[3*MAX_DUMP_BYTES+4]; 1737 char *bp = buf; 1738 struct mbuf *m; 1739 1740 for (m = m0; m; m = m->m_next) { 1741 int l = m->m_len; 1742 u_char *rptr = (u_char *)m->m_data; 1743 1744 while (l--) { 1745 if (bp > buf + sizeof(buf) - 4) 1746 goto done; 1747 /* Convert byte to ascii hex */ 1748 *bp++ = hexdigits[*rptr >> 4]; 1749 *bp++ = hexdigits[*rptr++ & 0xf]; 1750 } 1751 1752 if (m->m_next) { 1753 if (bp > buf + sizeof(buf) - 3) 1754 goto done; 1755 *bp++ = '|'; 1756 } else 1757 *bp++ = ' '; 1758 } 1759 done: 1760 if (m) 1761 *bp++ = '>'; 1762 *bp = 0; 1763 printf("%s\n", buf); 1764 } 1765 1766 #ifdef ALTQ 1767 /* 1768 * A wrapper to transmit a packet from if_start since ALTQ uses 1769 * if_start to send a packet. 1770 */ 1771 static void 1772 ppp_ifstart(struct ifnet *ifp) 1773 { 1774 struct ppp_softc *sc; 1775 1776 sc = ifp->if_softc; 1777 (*sc->sc_start)(sc); 1778 } 1779 #endif 1780 1781 static const struct ppp_known_compressor { 1782 uint8_t code; 1783 const char *module; 1784 } ppp_known_compressors[] = { 1785 { CI_DEFLATE, "ppp_deflate" }, 1786 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1787 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1788 { CI_MPPE, "ppp_mppe" }, 1789 { 0, NULL } 1790 }; 1791 1792 static int 1793 ppp_compressor_init(void) 1794 { 1795 1796 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1797 return 0; 1798 } 1799 1800 static void 1801 ppp_compressor_rele(struct compressor *cp) 1802 { 1803 1804 mutex_enter(&ppp_compressors_mtx); 1805 --cp->comp_refcnt; 1806 mutex_exit(&ppp_compressors_mtx); 1807 } 1808 1809 static struct compressor * 1810 ppp_get_compressor_noload(uint8_t ci, bool hold) 1811 { 1812 struct compressor *cp; 1813 1814 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1815 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1816 if (cp->compress_proto == ci) { 1817 if (hold) 1818 ++cp->comp_refcnt; 1819 return cp; 1820 } 1821 } 1822 1823 return NULL; 1824 } 1825 1826 static struct compressor * 1827 ppp_get_compressor(uint8_t ci) 1828 { 1829 struct compressor *cp = NULL; 1830 const struct ppp_known_compressor *pkc; 1831 1832 mutex_enter(&ppp_compressors_mtx); 1833 cp = ppp_get_compressor_noload(ci, true); 1834 mutex_exit(&ppp_compressors_mtx); 1835 if (cp != NULL) 1836 return cp; 1837 1838 kernconfig_lock(); 1839 mutex_enter(&ppp_compressors_mtx); 1840 cp = ppp_get_compressor_noload(ci, true); 1841 mutex_exit(&ppp_compressors_mtx); 1842 if (cp == NULL) { 1843 /* Not found, so try to autoload a module */ 1844 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1845 if (pkc->code == ci) { 1846 if (module_autoload(pkc->module, 1847 MODULE_CLASS_MISC) != 0) 1848 break; 1849 mutex_enter(&ppp_compressors_mtx); 1850 cp = ppp_get_compressor_noload(ci, true); 1851 mutex_exit(&ppp_compressors_mtx); 1852 break; 1853 } 1854 } 1855 } 1856 kernconfig_unlock(); 1857 1858 return cp; 1859 } 1860 1861 int 1862 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1863 { 1864 int error = 0; 1865 size_t i; 1866 1867 RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); 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) != NULL) 1873 error = EEXIST; 1874 } 1875 if (!error) { 1876 for (i = 0; i < ncomp; i++) { 1877 pc[i].comp_refcnt = 0; 1878 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1879 } 1880 } 1881 mutex_exit(&ppp_compressors_mtx); 1882 1883 return error; 1884 } 1885 1886 int 1887 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1888 { 1889 int error = 0; 1890 size_t i; 1891 1892 mutex_enter(&ppp_compressors_mtx); 1893 for (i = 0; i < ncomp; i++) { 1894 if (ppp_get_compressor_noload(pc[i].compress_proto, 1895 false) != &pc[i]) 1896 error = ENOENT; 1897 else if (pc[i].comp_refcnt != 0) 1898 error = EBUSY; 1899 } 1900 if (!error) { 1901 for (i = 0; i < ncomp; i++) { 1902 LIST_REMOVE(&pc[i], comp_list); 1903 } 1904 } 1905 mutex_exit(&ppp_compressors_mtx); 1906 1907 return error; 1908 } 1909
Indexes created Fri Oct 03 02:09:57 GMT 2025