if_ppp.c revision 1.105.4.1
1 /* $NetBSD: if_ppp.c,v 1.105.4.1 2006/02/04 14:18:52 simonb 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 1.105.4.1 2006/02/04 14:18:52 simonb 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/conf.h> 128 129 #include <net/if.h> 130 #include <net/if_types.h> 131 #include <net/netisr.h> 132 #include <net/route.h> 133 #ifdef PPP_FILTER 134 #include <net/bpf.h> 135 #endif 136 137 #include <machine/intr.h> 138 139 #include <netinet/in.h> 140 #include <netinet/in_systm.h> 141 #include <netinet/in_var.h> 142 #ifdef INET 143 #include <netinet/ip.h> 144 #endif 145 146 #include "bpfilter.h" 147 #if NBPFILTER > 0 148 #include <net/bpf.h> 149 #endif 150 151 #if defined(PPP_FILTER) || NBPFILTER > 0 152 #include <net/slip.h> 153 #endif 154 155 #ifdef VJC 156 #include <net/slcompress.h> 157 #endif 158 159 #include <net/ppp_defs.h> 160 #include <net/if_ppp.h> 161 #include <net/if_pppvar.h> 162 #include <machine/cpu.h> 163 164 #ifdef PPP_COMPRESS 165 #define PACKETPTR struct mbuf * 166 #include <net/ppp-comp.h> 167 #endif 168 169 static int pppsioctl(struct ifnet *, u_long, caddr_t); 170 static void ppp_requeue(struct ppp_softc *); 171 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 172 static void ppp_ccp_closed(struct ppp_softc *); 173 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 174 static void pppdumpm(struct mbuf *m0); 175 #ifdef ALTQ 176 static void ppp_ifstart(struct ifnet *ifp); 177 #endif 178 179 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 180 void pppnetisr(void); 181 #endif 182 static void pppintr(void *); 183 184 /* 185 * Some useful mbuf macros not in mbuf.h. 186 */ 187 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 188 189 #define M_DATASTART(m) \ 190 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 191 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 192 193 #define M_DATASIZE(m) \ 194 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 195 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 196 197 /* 198 * We define two link layer specific mbuf flags, to mark high-priority 199 * packets for output, and received packets following lost/corrupted 200 * packets. 201 */ 202 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 203 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 204 205 static int ppp_clone_create(struct if_clone *, int); 206 static int ppp_clone_destroy(struct ifnet *); 207 208 static struct ppp_softc *ppp_create(const char *, int); 209 210 static LIST_HEAD(, ppp_softc) ppp_softc_list; 211 212 struct if_clone ppp_cloner = 213 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 214 215 static struct simplelock ppp_list_mutex = SIMPLELOCK_INITIALIZER; 216 217 #ifdef PPP_COMPRESS 218 /* 219 * List of compressors we know about. 220 * We leave some space so maybe we can modload compressors. 221 */ 222 223 extern struct compressor ppp_bsd_compress; 224 extern struct compressor ppp_deflate, ppp_deflate_draft; 225 226 struct compressor *ppp_compressors[PPP_COMPRESSORS_MAX] = { 227 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) 228 &ppp_bsd_compress, 229 #endif 230 #if DO_DEFLATE && defined(PPP_DEFLATE) 231 &ppp_deflate, 232 &ppp_deflate_draft, 233 #endif 234 NULL 235 }; 236 #endif /* PPP_COMPRESS */ 237 238 239 /* 240 * Called from boot code to establish ppp interfaces. 241 */ 242 void 243 pppattach(void) 244 { 245 extern struct linesw ppp_disc; 246 247 if (ttyldisc_attach(&ppp_disc) != 0) 248 panic("pppattach"); 249 LIST_INIT(&ppp_softc_list); 250 if_clone_attach(&ppp_cloner); 251 } 252 253 static struct ppp_softc * 254 ppp_create(const char *name, int unit) 255 { 256 struct ppp_softc *sc, *sci, *scl = NULL; 257 258 MALLOC(sc, struct ppp_softc *, sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 259 260 simple_lock(&ppp_list_mutex); 261 if (unit == -1) { 262 int i = 0; 263 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 264 scl = sci; 265 if (i < sci->sc_unit) { 266 unit = i; 267 break; 268 } else { 269 #ifdef DIAGNOSTIC 270 KASSERT(i == sci->sc_unit); 271 #endif 272 i++; 273 } 274 } 275 if (unit == -1) 276 unit = i; 277 } else { 278 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 279 scl = sci; 280 if (unit < sci->sc_unit) 281 break; 282 else if (unit == sci->sc_unit) { 283 FREE(sc, M_DEVBUF); 284 return NULL; 285 } 286 } 287 } 288 289 if (sci != NULL) 290 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 291 else if (scl != NULL) 292 LIST_INSERT_AFTER(scl, sc, sc_iflist); 293 else 294 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 295 296 simple_unlock(&ppp_list_mutex); 297 298 (void)snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 299 name, sc->sc_unit = unit); 300 callout_init(&sc->sc_timo_ch); 301 sc->sc_if.if_softc = sc; 302 sc->sc_if.if_mtu = PPP_MTU; 303 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 304 sc->sc_if.if_type = IFT_PPP; 305 sc->sc_if.if_hdrlen = PPP_HDRLEN; 306 sc->sc_if.if_dlt = DLT_NULL; 307 sc->sc_if.if_ioctl = pppsioctl; 308 sc->sc_if.if_output = pppoutput; 309 #ifdef ALTQ 310 sc->sc_if.if_start = ppp_ifstart; 311 #endif 312 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 313 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 314 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 315 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 316 /* Ratio of 1:2 packets between the regular and the fast queue */ 317 sc->sc_maxfastq = 2; 318 IFQ_SET_READY(&sc->sc_if.if_snd); 319 if_attach(&sc->sc_if); 320 if_alloc_sadl(&sc->sc_if); 321 #if NBPFILTER > 0 322 bpfattach(&sc->sc_if, DLT_NULL, 0); 323 #endif 324 return sc; 325 } 326 327 static int 328 ppp_clone_create(struct if_clone *ifc, int unit) 329 { 330 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 331 } 332 333 static int 334 ppp_clone_destroy(struct ifnet *ifp) 335 { 336 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 337 338 if (sc->sc_devp != NULL) 339 return EBUSY; /* Not removing it */ 340 341 simple_lock(&ppp_list_mutex); 342 LIST_REMOVE(sc, sc_iflist); 343 simple_unlock(&ppp_list_mutex); 344 345 #if NBPFILTER > 0 346 bpfdetach(ifp); 347 #endif 348 if_detach(ifp); 349 350 FREE(sc, M_DEVBUF); 351 return 0; 352 } 353 354 /* 355 * Allocate a ppp interface unit and initialize it. 356 */ 357 struct ppp_softc * 358 pppalloc(pid_t pid) 359 { 360 struct ppp_softc *sc = NULL, *scf; 361 int i; 362 363 simple_lock(&ppp_list_mutex); 364 for (scf = LIST_FIRST(&ppp_softc_list); scf != NULL; 365 scf = LIST_NEXT(scf, sc_iflist)) { 366 if (scf->sc_xfer == pid) { 367 scf->sc_xfer = 0; 368 simple_unlock(&ppp_list_mutex); 369 return scf; 370 } 371 if (scf->sc_devp == NULL && sc == NULL) 372 sc = scf; 373 } 374 simple_unlock(&ppp_list_mutex); 375 376 if (sc == NULL) 377 sc = ppp_create(ppp_cloner.ifc_name, -1); 378 379 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 380 sc->sc_si = softintr_establish(IPL_SOFTNET, pppintr, sc); 381 if (sc->sc_si == NULL) { 382 printf("%s: unable to establish softintr\n", sc->sc_if.if_xname); 383 return (NULL); 384 } 385 #endif 386 sc->sc_flags = 0; 387 sc->sc_mru = PPP_MRU; 388 sc->sc_relinq = NULL; 389 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 390 #ifdef VJC 391 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), 392 M_DEVBUF, M_NOWAIT); 393 if (sc->sc_comp) 394 sl_compress_init(sc->sc_comp); 395 #endif 396 #ifdef PPP_COMPRESS 397 sc->sc_xc_state = NULL; 398 sc->sc_rc_state = NULL; 399 #endif /* PPP_COMPRESS */ 400 for (i = 0; i < NUM_NP; ++i) 401 sc->sc_npmode[i] = NPMODE_ERROR; 402 sc->sc_npqueue = NULL; 403 sc->sc_npqtail = &sc->sc_npqueue; 404 sc->sc_last_sent = sc->sc_last_recv = time_second; 405 406 return sc; 407 } 408 409 /* 410 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 411 */ 412 void 413 pppdealloc(struct ppp_softc *sc) 414 { 415 struct mbuf *m; 416 417 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 418 softintr_disestablish(sc->sc_si); 419 #endif 420 if_down(&sc->sc_if); 421 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 422 sc->sc_devp = NULL; 423 sc->sc_xfer = 0; 424 for (;;) { 425 IF_DEQUEUE(&sc->sc_rawq, m); 426 if (m == NULL) 427 break; 428 m_freem(m); 429 } 430 for (;;) { 431 IF_DEQUEUE(&sc->sc_inq, m); 432 if (m == NULL) 433 break; 434 m_freem(m); 435 } 436 for (;;) { 437 IF_DEQUEUE(&sc->sc_fastq, m); 438 if (m == NULL) 439 break; 440 m_freem(m); 441 } 442 while ((m = sc->sc_npqueue) != NULL) { 443 sc->sc_npqueue = m->m_nextpkt; 444 m_freem(m); 445 } 446 if (sc->sc_togo != NULL) { 447 m_freem(sc->sc_togo); 448 sc->sc_togo = NULL; 449 } 450 #ifdef PPP_COMPRESS 451 ppp_ccp_closed(sc); 452 sc->sc_xc_state = NULL; 453 sc->sc_rc_state = NULL; 454 #endif /* PPP_COMPRESS */ 455 #ifdef PPP_FILTER 456 if (sc->sc_pass_filt_in.bf_insns != 0) { 457 FREE(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 458 sc->sc_pass_filt_in.bf_insns = 0; 459 sc->sc_pass_filt_in.bf_len = 0; 460 } 461 if (sc->sc_pass_filt_out.bf_insns != 0) { 462 FREE(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 463 sc->sc_pass_filt_out.bf_insns = 0; 464 sc->sc_pass_filt_out.bf_len = 0; 465 } 466 if (sc->sc_active_filt_in.bf_insns != 0) { 467 FREE(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 468 sc->sc_active_filt_in.bf_insns = 0; 469 sc->sc_active_filt_in.bf_len = 0; 470 } 471 if (sc->sc_active_filt_out.bf_insns != 0) { 472 FREE(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 473 sc->sc_active_filt_out.bf_insns = 0; 474 sc->sc_active_filt_out.bf_len = 0; 475 } 476 #endif /* PPP_FILTER */ 477 #ifdef VJC 478 if (sc->sc_comp != 0) { 479 FREE(sc->sc_comp, M_DEVBUF); 480 sc->sc_comp = 0; 481 } 482 #endif 483 (void)ppp_clone_destroy(&sc->sc_if); 484 } 485 486 /* 487 * Ioctl routine for generic ppp devices. 488 */ 489 int 490 pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag, 491 struct proc *p) 492 { 493 int s, error, flags, mru, npx; 494 u_int nb; 495 struct ppp_option_data *odp; 496 struct compressor **cp; 497 struct npioctl *npi; 498 time_t t; 499 #ifdef PPP_FILTER 500 struct bpf_program *bp, *nbp; 501 struct bpf_insn *newcode, *oldcode; 502 int newcodelen; 503 #endif /* PPP_FILTER */ 504 #ifdef PPP_COMPRESS 505 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 506 #endif 507 508 switch (cmd) { 509 case FIONREAD: 510 *(int *)data = sc->sc_inq.ifq_len; 511 break; 512 513 case PPPIOCGUNIT: 514 *(int *)data = sc->sc_unit; 515 break; 516 517 case PPPIOCGFLAGS: 518 *(u_int *)data = sc->sc_flags; 519 break; 520 521 case PPPIOCGRAWIN: 522 { 523 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 524 u_char c, q = 0; 525 526 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 527 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 528 529 for (c = 0; c < sc->sc_rawin_start;) 530 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 531 532 rwin->count = sc->sc_rawin.count; 533 } 534 break; 535 536 case PPPIOCSFLAGS: 537 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 538 return (error); 539 flags = *(int *)data & SC_MASK; 540 s = splsoftnet(); 541 #ifdef PPP_COMPRESS 542 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 543 ppp_ccp_closed(sc); 544 #endif 545 splhigh(); /* XXX IMP ME HARDER */ 546 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 547 splx(s); 548 break; 549 550 case PPPIOCSMRU: 551 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 552 return (error); 553 mru = *(int *)data; 554 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 555 sc->sc_mru = mru; 556 break; 557 558 case PPPIOCGMRU: 559 *(int *)data = sc->sc_mru; 560 break; 561 562 #ifdef VJC 563 case PPPIOCSMAXCID: 564 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 565 return (error); 566 if (sc->sc_comp) { 567 s = splsoftnet(); 568 sl_compress_setup(sc->sc_comp, *(int *)data); 569 splx(s); 570 } 571 break; 572 #endif 573 574 case PPPIOCXFERUNIT: 575 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 576 return (error); 577 sc->sc_xfer = p->p_pid; 578 break; 579 580 #ifdef PPP_COMPRESS 581 case PPPIOCSCOMPRESS: 582 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 583 return (error); 584 odp = (struct ppp_option_data *) data; 585 nb = odp->length; 586 if (nb > sizeof(ccp_option)) 587 nb = sizeof(ccp_option); 588 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 589 return (error); 590 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 591 return (EINVAL); 592 for (cp = ppp_compressors; *cp != NULL; ++cp) 593 if ((*cp)->compress_proto == ccp_option[0]) { 594 /* 595 * Found a handler for the protocol - try to allocate 596 * a compressor or decompressor. 597 */ 598 error = 0; 599 if (odp->transmit) { 600 s = splsoftnet(); 601 if (sc->sc_xc_state != NULL) 602 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 603 sc->sc_xcomp = *cp; 604 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); 605 if (sc->sc_xc_state == NULL) { 606 if (sc->sc_flags & SC_DEBUG) 607 printf("%s: comp_alloc failed\n", 608 sc->sc_if.if_xname); 609 error = ENOBUFS; 610 } 611 splhigh(); /* XXX IMP ME HARDER */ 612 sc->sc_flags &= ~SC_COMP_RUN; 613 splx(s); 614 } else { 615 s = splsoftnet(); 616 if (sc->sc_rc_state != NULL) 617 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 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 } 632 if (sc->sc_flags & SC_DEBUG) 633 printf("%s: no compressor for [%x %x %x], %x\n", 634 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 635 ccp_option[2], nb); 636 return (EINVAL); /* no handler found */ 637 #endif /* PPP_COMPRESS */ 638 639 case PPPIOCGNPMODE: 640 case PPPIOCSNPMODE: 641 npi = (struct npioctl *) data; 642 switch (npi->protocol) { 643 case PPP_IP: 644 npx = NP_IP; 645 break; 646 case PPP_IPV6: 647 npx = NP_IPV6; 648 break; 649 default: 650 return EINVAL; 651 } 652 if (cmd == PPPIOCGNPMODE) { 653 npi->mode = sc->sc_npmode[npx]; 654 } else { 655 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 656 return (error); 657 if (npi->mode != sc->sc_npmode[npx]) { 658 s = splnet(); 659 sc->sc_npmode[npx] = npi->mode; 660 if (npi->mode != NPMODE_QUEUE) { 661 ppp_requeue(sc); 662 ppp_restart(sc); 663 } 664 splx(s); 665 } 666 } 667 break; 668 669 case PPPIOCGIDLE: 670 s = splsoftnet(); 671 t = time_second; 672 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 673 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 674 splx(s); 675 break; 676 677 #ifdef PPP_FILTER 678 case PPPIOCSPASS: 679 case PPPIOCSACTIVE: 680 /* These are no longer supported. */ 681 return EOPNOTSUPP; 682 683 case PPPIOCSIPASS: 684 case PPPIOCSOPASS: 685 case PPPIOCSIACTIVE: 686 case PPPIOCSOACTIVE: 687 nbp = (struct bpf_program *) data; 688 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 689 return EINVAL; 690 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 691 if (newcodelen != 0) { 692 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 693 /* WAITOK -- malloc() never fails. */ 694 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, 695 newcodelen)) != 0) { 696 free(newcode, M_DEVBUF); 697 return error; 698 } 699 if (!bpf_validate(newcode, nbp->bf_len)) { 700 free(newcode, M_DEVBUF); 701 return EINVAL; 702 } 703 } else 704 newcode = 0; 705 switch (cmd) { 706 case PPPIOCSIPASS: 707 bp = &sc->sc_pass_filt_in; 708 break; 709 710 case PPPIOCSOPASS: 711 bp = &sc->sc_pass_filt_out; 712 break; 713 714 case PPPIOCSIACTIVE: 715 bp = &sc->sc_active_filt_in; 716 break; 717 718 case PPPIOCSOACTIVE: 719 bp = &sc->sc_active_filt_out; 720 break; 721 default: 722 free(newcode, M_DEVBUF); 723 return (EPASSTHROUGH); 724 } 725 oldcode = bp->bf_insns; 726 s = splnet(); 727 bp->bf_len = nbp->bf_len; 728 bp->bf_insns = newcode; 729 splx(s); 730 if (oldcode != 0) 731 free(oldcode, M_DEVBUF); 732 break; 733 #endif /* PPP_FILTER */ 734 735 default: 736 return (EPASSTHROUGH); 737 } 738 return (0); 739 } 740 741 /* 742 * Process an ioctl request to the ppp network interface. 743 */ 744 static int 745 pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 746 { 747 struct proc *p = curproc; /* XXX */ 748 struct ppp_softc *sc = ifp->if_softc; 749 struct ifaddr *ifa = (struct ifaddr *)data; 750 struct ifreq *ifr = (struct ifreq *)data; 751 struct ppp_stats *psp; 752 #ifdef PPP_COMPRESS 753 struct ppp_comp_stats *pcp; 754 #endif 755 int s = splnet(), error = 0; 756 757 switch (cmd) { 758 case SIOCSIFFLAGS: 759 if ((ifp->if_flags & IFF_RUNNING) == 0) 760 ifp->if_flags &= ~IFF_UP; 761 break; 762 763 case SIOCSIFADDR: 764 switch (ifa->ifa_addr->sa_family) { 765 #ifdef INET 766 case AF_INET: 767 break; 768 #endif 769 #ifdef INET6 770 case AF_INET6: 771 break; 772 #endif 773 default: 774 error = EAFNOSUPPORT; 775 break; 776 } 777 break; 778 779 case SIOCSIFDSTADDR: 780 switch (ifa->ifa_addr->sa_family) { 781 #ifdef INET 782 case AF_INET: 783 break; 784 #endif 785 #ifdef INET6 786 case AF_INET6: 787 break; 788 #endif 789 default: 790 error = EAFNOSUPPORT; 791 break; 792 } 793 break; 794 795 case SIOCSIFMTU: 796 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 797 break; 798 sc->sc_if.if_mtu = ifr->ifr_mtu; 799 break; 800 801 case SIOCGIFMTU: 802 ifr->ifr_mtu = sc->sc_if.if_mtu; 803 break; 804 805 case SIOCADDMULTI: 806 case SIOCDELMULTI: 807 if (ifr == 0) { 808 error = EAFNOSUPPORT; 809 break; 810 } 811 switch (ifr->ifr_addr.sa_family) { 812 #ifdef INET 813 case AF_INET: 814 break; 815 #endif 816 #ifdef INET6 817 case AF_INET6: 818 break; 819 #endif 820 default: 821 error = EAFNOSUPPORT; 822 break; 823 } 824 break; 825 826 case SIOCGPPPSTATS: 827 psp = &((struct ifpppstatsreq *) data)->stats; 828 memset(psp, 0, sizeof(*psp)); 829 psp->p = sc->sc_stats; 830 #if defined(VJC) && !defined(SL_NO_STATS) 831 if (sc->sc_comp) { 832 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 833 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 834 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 835 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 836 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 837 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 838 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 839 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 840 } 841 #endif /* VJC */ 842 break; 843 844 #ifdef PPP_COMPRESS 845 case SIOCGPPPCSTATS: 846 pcp = &((struct ifpppcstatsreq *) data)->stats; 847 memset(pcp, 0, sizeof(*pcp)); 848 if (sc->sc_xc_state != NULL) 849 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 850 if (sc->sc_rc_state != NULL) 851 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 852 break; 853 #endif /* PPP_COMPRESS */ 854 855 default: 856 error = EINVAL; 857 } 858 splx(s); 859 return (error); 860 } 861 862 /* 863 * Queue a packet. Start transmission if not active. 864 * Packet is placed in Information field of PPP frame. 865 */ 866 int 867 pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 868 struct rtentry *rtp) 869 { 870 struct ppp_softc *sc = ifp->if_softc; 871 int protocol, address, control; 872 u_char *cp; 873 int s, error; 874 #ifdef INET 875 struct ip *ip; 876 #endif 877 struct ifqueue *ifq; 878 enum NPmode mode; 879 int len; 880 ALTQ_DECL(struct altq_pktattr pktattr;) 881 882 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 883 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 884 error = ENETDOWN; /* sort of */ 885 goto bad; 886 } 887 888 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 889 890 /* 891 * Compute PPP header. 892 */ 893 m0->m_flags &= ~M_HIGHPRI; 894 switch (dst->sa_family) { 895 #ifdef INET 896 case AF_INET: 897 address = PPP_ALLSTATIONS; 898 control = PPP_UI; 899 protocol = PPP_IP; 900 mode = sc->sc_npmode[NP_IP]; 901 902 /* 903 * If this packet has the "low delay" bit set in the IP header, 904 * put it on the fastq instead. 905 */ 906 ip = mtod(m0, struct ip *); 907 if (ip->ip_tos & IPTOS_LOWDELAY) 908 m0->m_flags |= M_HIGHPRI; 909 break; 910 #endif 911 #ifdef INET6 912 case AF_INET6: 913 address = PPP_ALLSTATIONS; /*XXX*/ 914 control = PPP_UI; /*XXX*/ 915 protocol = PPP_IPV6; 916 mode = sc->sc_npmode[NP_IPV6]; 917 918 #if 0 /* XXX flowinfo/traffic class, maybe? */ 919 /* 920 * If this packet has the "low delay" bit set in the IP header, 921 * put it on the fastq instead. 922 */ 923 ip = mtod(m0, struct ip *); 924 if (ip->ip_tos & IPTOS_LOWDELAY) 925 m0->m_flags |= M_HIGHPRI; 926 #endif 927 break; 928 #endif 929 case AF_UNSPEC: 930 address = PPP_ADDRESS(dst->sa_data); 931 control = PPP_CONTROL(dst->sa_data); 932 protocol = PPP_PROTOCOL(dst->sa_data); 933 mode = NPMODE_PASS; 934 break; 935 default: 936 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 937 error = EAFNOSUPPORT; 938 goto bad; 939 } 940 941 /* 942 * Drop this packet, or return an error, if necessary. 943 */ 944 if (mode == NPMODE_ERROR) { 945 error = ENETDOWN; 946 goto bad; 947 } 948 if (mode == NPMODE_DROP) { 949 error = 0; 950 goto bad; 951 } 952 953 /* 954 * Add PPP header. 955 */ 956 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 957 if (m0 == NULL) { 958 error = ENOBUFS; 959 goto bad; 960 } 961 962 cp = mtod(m0, u_char *); 963 *cp++ = address; 964 *cp++ = control; 965 *cp++ = protocol >> 8; 966 *cp++ = protocol & 0xff; 967 968 len = m_length(m0); 969 970 if (sc->sc_flags & SC_LOG_OUTPKT) { 971 printf("%s output: ", ifp->if_xname); 972 pppdumpm(m0); 973 } 974 975 if ((protocol & 0x8000) == 0) { 976 #ifdef PPP_FILTER 977 /* 978 * Apply the pass and active filters to the packet, 979 * but only if it is a data packet. 980 */ 981 if (sc->sc_pass_filt_out.bf_insns != 0 982 && bpf_filter(sc->sc_pass_filt_out.bf_insns, (u_char *) m0, 983 len, 0) == 0) { 984 error = 0; /* drop this packet */ 985 goto bad; 986 } 987 988 /* 989 * Update the time we sent the most recent packet. 990 */ 991 if (sc->sc_active_filt_out.bf_insns == 0 992 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *) m0, 993 len, 0)) 994 sc->sc_last_sent = time_second; 995 #else 996 /* 997 * Update the time we sent the most recent packet. 998 */ 999 sc->sc_last_sent = time_second; 1000 #endif /* PPP_FILTER */ 1001 } 1002 1003 #if NBPFILTER > 0 1004 /* 1005 * See if bpf wants to look at the packet. 1006 */ 1007 if (sc->sc_if.if_bpf) 1008 bpf_mtap(sc->sc_if.if_bpf, m0); 1009 #endif 1010 1011 /* 1012 * Put the packet on the appropriate queue. 1013 */ 1014 s = splnet(); 1015 if (mode == NPMODE_QUEUE) { 1016 /* XXX we should limit the number of packets on this queue */ 1017 *sc->sc_npqtail = m0; 1018 m0->m_nextpkt = NULL; 1019 sc->sc_npqtail = &m0->m_nextpkt; 1020 } else { 1021 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1022 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 1023 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { 1024 splx(s); 1025 sc->sc_if.if_oerrors++; 1026 sc->sc_stats.ppp_oerrors++; 1027 return (error); 1028 } 1029 ppp_restart(sc); 1030 } 1031 ifp->if_opackets++; 1032 ifp->if_obytes += len; 1033 1034 splx(s); 1035 return (0); 1036 1037 bad: 1038 m_freem(m0); 1039 return (error); 1040 } 1041 1042 /* 1043 * After a change in the NPmode for some NP, move packets from the 1044 * npqueue to the send queue or the fast queue as appropriate. 1045 * Should be called at splnet, since we muck with the queues. 1046 */ 1047 static void 1048 ppp_requeue(struct ppp_softc *sc) 1049 { 1050 struct mbuf *m, **mpp; 1051 struct ifqueue *ifq; 1052 enum NPmode mode; 1053 int error; 1054 1055 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1056 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1057 case PPP_IP: 1058 mode = sc->sc_npmode[NP_IP]; 1059 break; 1060 case PPP_IPV6: 1061 mode = sc->sc_npmode[NP_IPV6]; 1062 break; 1063 default: 1064 mode = NPMODE_PASS; 1065 } 1066 1067 switch (mode) { 1068 case NPMODE_PASS: 1069 /* 1070 * This packet can now go on one of the queues to be sent. 1071 */ 1072 *mpp = m->m_nextpkt; 1073 m->m_nextpkt = NULL; 1074 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1075 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA 1076 ALTQ_DECL(NULL))) != 0) { 1077 sc->sc_if.if_oerrors++; 1078 sc->sc_stats.ppp_oerrors++; 1079 } 1080 break; 1081 1082 case NPMODE_DROP: 1083 case NPMODE_ERROR: 1084 *mpp = m->m_nextpkt; 1085 m_freem(m); 1086 break; 1087 1088 case NPMODE_QUEUE: 1089 mpp = &m->m_nextpkt; 1090 break; 1091 } 1092 } 1093 sc->sc_npqtail = mpp; 1094 } 1095 1096 /* 1097 * Transmitter has finished outputting some stuff; 1098 * remember to call sc->sc_start later at splsoftnet. 1099 */ 1100 void 1101 ppp_restart(struct ppp_softc *sc) 1102 { 1103 int s = splhigh(); /* XXX IMP ME HARDER */ 1104 1105 sc->sc_flags &= ~SC_TBUSY; 1106 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1107 softintr_schedule(sc->sc_si); 1108 #else 1109 schednetisr(NETISR_PPP); 1110 #endif 1111 splx(s); 1112 } 1113 1114 /* 1115 * Get a packet to send. This procedure is intended to be called at 1116 * splsoftnet, since it may involve time-consuming operations such as 1117 * applying VJ compression, packet compression, address/control and/or 1118 * protocol field compression to the packet. 1119 */ 1120 struct mbuf * 1121 ppp_dequeue(struct ppp_softc *sc) 1122 { 1123 struct mbuf *m, *mp; 1124 u_char *cp; 1125 int address, control, protocol; 1126 int s; 1127 1128 /* 1129 * Grab a packet to send: first try the fast queue, then the 1130 * normal queue. 1131 */ 1132 s = splnet(); 1133 if (sc->sc_nfastq < sc->sc_maxfastq) { 1134 IF_DEQUEUE(&sc->sc_fastq, m); 1135 if (m != NULL) 1136 sc->sc_nfastq++; 1137 else 1138 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1139 } else { 1140 sc->sc_nfastq = 0; 1141 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1142 if (m == NULL) { 1143 IF_DEQUEUE(&sc->sc_fastq, m); 1144 if (m != NULL) 1145 sc->sc_nfastq++; 1146 } 1147 } 1148 splx(s); 1149 1150 if (m == NULL) 1151 return NULL; 1152 1153 ++sc->sc_stats.ppp_opackets; 1154 1155 /* 1156 * Extract the ppp header of the new packet. 1157 * The ppp header will be in one mbuf. 1158 */ 1159 cp = mtod(m, u_char *); 1160 address = PPP_ADDRESS(cp); 1161 control = PPP_CONTROL(cp); 1162 protocol = PPP_PROTOCOL(cp); 1163 1164 switch (protocol) { 1165 case PPP_IP: 1166 #ifdef VJC 1167 /* 1168 * If the packet is a TCP/IP packet, see if we can compress it. 1169 */ 1170 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1171 struct ip *ip; 1172 int type; 1173 1174 mp = m; 1175 ip = (struct ip *) (cp + PPP_HDRLEN); 1176 if (mp->m_len <= PPP_HDRLEN) { 1177 mp = mp->m_next; 1178 if (mp == NULL) 1179 break; 1180 ip = mtod(mp, struct ip *); 1181 } 1182 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1183 if (ip->ip_p == IPPROTO_TCP) { 1184 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1185 !(sc->sc_flags & SC_NO_TCP_CCID)); 1186 switch (type) { 1187 case TYPE_UNCOMPRESSED_TCP: 1188 protocol = PPP_VJC_UNCOMP; 1189 break; 1190 case TYPE_COMPRESSED_TCP: 1191 protocol = PPP_VJC_COMP; 1192 cp = mtod(m, u_char *); 1193 cp[0] = address; /* header has moved */ 1194 cp[1] = control; 1195 cp[2] = 0; 1196 break; 1197 } 1198 cp[3] = protocol; /* update protocol in PPP header */ 1199 } 1200 } 1201 #endif /* VJC */ 1202 break; 1203 1204 #ifdef PPP_COMPRESS 1205 case PPP_CCP: 1206 ppp_ccp(sc, m, 0); 1207 break; 1208 #endif /* PPP_COMPRESS */ 1209 } 1210 1211 #ifdef PPP_COMPRESS 1212 if (protocol != PPP_LCP && protocol != PPP_CCP 1213 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1214 struct mbuf *mcomp = NULL; 1215 int slen; 1216 1217 slen = 0; 1218 for (mp = m; mp != NULL; mp = mp->m_next) 1219 slen += mp->m_len; 1220 (*sc->sc_xcomp->compress) 1221 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1222 if (mcomp != NULL) { 1223 if (sc->sc_flags & SC_CCP_UP) { 1224 /* Send the compressed packet instead of the original. */ 1225 m_freem(m); 1226 m = mcomp; 1227 cp = mtod(m, u_char *); 1228 protocol = cp[3]; 1229 } else { 1230 /* Can't transmit compressed packets until CCP is up. */ 1231 m_freem(mcomp); 1232 } 1233 } 1234 } 1235 #endif /* PPP_COMPRESS */ 1236 1237 /* 1238 * Compress the address/control and protocol, if possible. 1239 */ 1240 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1241 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1242 protocol != PPP_LCP) { 1243 /* can compress address/control */ 1244 m->m_data += 2; 1245 m->m_len -= 2; 1246 } 1247 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1248 /* can compress protocol */ 1249 if (mtod(m, u_char *) == cp) { 1250 cp[2] = cp[1]; /* move address/control up */ 1251 cp[1] = cp[0]; 1252 } 1253 ++m->m_data; 1254 --m->m_len; 1255 } 1256 1257 return m; 1258 } 1259 1260 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1261 void 1262 pppnetisr(void) 1263 { 1264 struct ppp_softc *sc; 1265 1266 for (sc = LIST_FIRST(&ppp_softc_list); sc != NULL; 1267 sc = LIST_NEXT(sc, sc_iflist)) 1268 pppintr(sc); 1269 } 1270 #endif 1271 1272 /* 1273 * Software interrupt routine, called at splsoftnet. 1274 */ 1275 static void 1276 pppintr(void *arg) 1277 { 1278 struct ppp_softc *sc = arg; 1279 struct mbuf *m; 1280 int s; 1281 1282 if (!(sc->sc_flags & SC_TBUSY) 1283 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1284 || sc->sc_outm)) { 1285 s = splhigh(); /* XXX IMP ME HARDER */ 1286 sc->sc_flags |= SC_TBUSY; 1287 splx(s); 1288 (*sc->sc_start)(sc); 1289 } 1290 for (;;) { 1291 s = splnet(); 1292 IF_DEQUEUE(&sc->sc_rawq, m); 1293 splx(s); 1294 if (m == NULL) 1295 break; 1296 ppp_inproc(sc, m); 1297 } 1298 } 1299 1300 #ifdef PPP_COMPRESS 1301 /* 1302 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1303 * 0 if it is about to be transmitted. 1304 */ 1305 static void 1306 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1307 { 1308 u_char *dp, *ep; 1309 struct mbuf *mp; 1310 int slen, s; 1311 1312 /* 1313 * Get a pointer to the data after the PPP header. 1314 */ 1315 if (m->m_len <= PPP_HDRLEN) { 1316 mp = m->m_next; 1317 if (mp == NULL) 1318 return; 1319 dp = (mp != NULL)? mtod(mp, u_char *): NULL; 1320 } else { 1321 mp = m; 1322 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1323 } 1324 1325 ep = mtod(mp, u_char *) + mp->m_len; 1326 if (dp + CCP_HDRLEN > ep) 1327 return; 1328 slen = CCP_LENGTH(dp); 1329 if (dp + slen > ep) { 1330 if (sc->sc_flags & SC_DEBUG) 1331 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1332 dp, slen, mtod(mp, u_char *), mp->m_len); 1333 return; 1334 } 1335 1336 switch (CCP_CODE(dp)) { 1337 case CCP_CONFREQ: 1338 case CCP_TERMREQ: 1339 case CCP_TERMACK: 1340 /* CCP must be going down - disable compression */ 1341 if (sc->sc_flags & SC_CCP_UP) { 1342 s = splhigh(); /* XXX IMP ME HARDER */ 1343 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1344 splx(s); 1345 } 1346 break; 1347 1348 case CCP_CONFACK: 1349 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1350 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1351 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1352 if (!rcvd) { 1353 /* we're agreeing to send compressed packets. */ 1354 if (sc->sc_xc_state != NULL 1355 && (*sc->sc_xcomp->comp_init) 1356 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1357 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1358 s = splhigh(); /* XXX IMP ME HARDER */ 1359 sc->sc_flags |= SC_COMP_RUN; 1360 splx(s); 1361 } 1362 } else { 1363 /* peer is agreeing to send compressed packets. */ 1364 if (sc->sc_rc_state != NULL 1365 && (*sc->sc_rcomp->decomp_init) 1366 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1367 sc->sc_unit, 0, sc->sc_mru, 1368 sc->sc_flags & SC_DEBUG)) { 1369 s = splhigh(); /* XXX IMP ME HARDER */ 1370 sc->sc_flags |= SC_DECOMP_RUN; 1371 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1372 splx(s); 1373 } 1374 } 1375 } 1376 break; 1377 1378 case CCP_RESETACK: 1379 if (sc->sc_flags & SC_CCP_UP) { 1380 if (!rcvd) { 1381 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1382 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1383 } else { 1384 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1385 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1386 s = splhigh(); /* XXX IMP ME HARDER */ 1387 sc->sc_flags &= ~SC_DC_ERROR; 1388 splx(s); 1389 } 1390 } 1391 } 1392 break; 1393 } 1394 } 1395 1396 /* 1397 * CCP is down; free (de)compressor state if necessary. 1398 */ 1399 static void 1400 ppp_ccp_closed(struct ppp_softc *sc) 1401 { 1402 if (sc->sc_xc_state) { 1403 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1404 sc->sc_xc_state = NULL; 1405 } 1406 if (sc->sc_rc_state) { 1407 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1408 sc->sc_rc_state = NULL; 1409 } 1410 } 1411 #endif /* PPP_COMPRESS */ 1412 1413 /* 1414 * PPP packet input routine. 1415 * The caller has checked and removed the FCS and has inserted 1416 * the address/control bytes and the protocol high byte if they 1417 * were omitted. 1418 */ 1419 void 1420 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1421 { 1422 int s = splhigh(); /* XXX IMP ME HARDER */ 1423 1424 if (lost) 1425 m->m_flags |= M_ERRMARK; 1426 IF_ENQUEUE(&sc->sc_rawq, m); 1427 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1428 softintr_schedule(sc->sc_si); 1429 #else 1430 schednetisr(NETISR_PPP); 1431 #endif 1432 splx(s); 1433 } 1434 1435 /* 1436 * Process a received PPP packet, doing decompression as necessary. 1437 * Should be called at splsoftnet. 1438 */ 1439 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1440 TYPE_UNCOMPRESSED_TCP) 1441 1442 static void 1443 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1444 { 1445 struct ifnet *ifp = &sc->sc_if; 1446 struct ifqueue *inq; 1447 int s, ilen, proto, rv; 1448 u_char *cp, adrs, ctrl; 1449 struct mbuf *mp, *dmp = NULL; 1450 #ifdef VJC 1451 int xlen; 1452 u_char *iphdr; 1453 u_int hlen; 1454 #endif 1455 1456 sc->sc_stats.ppp_ipackets++; 1457 1458 if (sc->sc_flags & SC_LOG_INPKT) { 1459 ilen = 0; 1460 for (mp = m; mp != NULL; mp = mp->m_next) 1461 ilen += mp->m_len; 1462 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1463 pppdumpm(m); 1464 } 1465 1466 cp = mtod(m, u_char *); 1467 adrs = PPP_ADDRESS(cp); 1468 ctrl = PPP_CONTROL(cp); 1469 proto = PPP_PROTOCOL(cp); 1470 1471 if (m->m_flags & M_ERRMARK) { 1472 m->m_flags &= ~M_ERRMARK; 1473 s = splhigh(); /* XXX IMP ME HARDER */ 1474 sc->sc_flags |= SC_VJ_RESET; 1475 splx(s); 1476 } 1477 1478 #ifdef PPP_COMPRESS 1479 /* 1480 * Decompress this packet if necessary, update the receiver's 1481 * dictionary, or take appropriate action on a CCP packet. 1482 */ 1483 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1484 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1485 /* decompress this packet */ 1486 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1487 if (rv == DECOMP_OK) { 1488 m_freem(m); 1489 if (dmp == NULL) { 1490 /* no error, but no decompressed packet produced */ 1491 return; 1492 } 1493 m = dmp; 1494 cp = mtod(m, u_char *); 1495 proto = PPP_PROTOCOL(cp); 1496 1497 } else { 1498 /* 1499 * An error has occurred in decompression. 1500 * Pass the compressed packet up to pppd, which may take 1501 * CCP down or issue a Reset-Req. 1502 */ 1503 if (sc->sc_flags & SC_DEBUG) 1504 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1505 s = splhigh(); /* XXX IMP ME HARDER */ 1506 sc->sc_flags |= SC_VJ_RESET; 1507 if (rv == DECOMP_ERROR) 1508 sc->sc_flags |= SC_DC_ERROR; 1509 else 1510 sc->sc_flags |= SC_DC_FERROR; 1511 splx(s); 1512 } 1513 1514 } else { 1515 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1516 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1517 } 1518 if (proto == PPP_CCP) { 1519 ppp_ccp(sc, m, 1); 1520 } 1521 } 1522 #endif 1523 1524 ilen = 0; 1525 for (mp = m; mp != NULL; mp = mp->m_next) 1526 ilen += mp->m_len; 1527 1528 #ifdef VJC 1529 if (sc->sc_flags & SC_VJ_RESET) { 1530 /* 1531 * If we've missed a packet, we must toss subsequent compressed 1532 * packets which don't have an explicit connection ID. 1533 */ 1534 if (sc->sc_comp) 1535 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1536 s = splhigh(); /* XXX IMP ME HARDER */ 1537 sc->sc_flags &= ~SC_VJ_RESET; 1538 splx(s); 1539 } 1540 1541 /* 1542 * See if we have a VJ-compressed packet to uncompress. 1543 */ 1544 if (proto == PPP_VJC_COMP) { 1545 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1546 goto bad; 1547 1548 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1549 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1550 sc->sc_comp, &iphdr, &hlen); 1551 1552 if (xlen <= 0) { 1553 if (sc->sc_flags & SC_DEBUG) 1554 printf("%s: VJ uncompress failed on type comp\n", 1555 ifp->if_xname); 1556 goto bad; 1557 } 1558 1559 /* Copy the PPP and IP headers into a new mbuf. */ 1560 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1561 if (mp == NULL) 1562 goto bad; 1563 mp->m_len = 0; 1564 mp->m_next = NULL; 1565 if (hlen + PPP_HDRLEN > MHLEN) { 1566 MCLGET(mp, M_DONTWAIT); 1567 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1568 m_freem(mp); 1569 goto bad; /* lose if big headers and no clusters */ 1570 } 1571 } 1572 cp = mtod(mp, u_char *); 1573 cp[0] = adrs; 1574 cp[1] = ctrl; 1575 cp[2] = 0; 1576 cp[3] = PPP_IP; 1577 proto = PPP_IP; 1578 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1579 mp->m_len = hlen + PPP_HDRLEN; 1580 1581 /* 1582 * Trim the PPP and VJ headers off the old mbuf 1583 * and stick the new and old mbufs together. 1584 */ 1585 m->m_data += PPP_HDRLEN + xlen; 1586 m->m_len -= PPP_HDRLEN + xlen; 1587 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1588 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1589 mp->m_len += m->m_len; 1590 MFREE(m, mp->m_next); 1591 } else 1592 mp->m_next = m; 1593 m = mp; 1594 ilen += hlen - xlen; 1595 1596 } else if (proto == PPP_VJC_UNCOMP) { 1597 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1598 goto bad; 1599 1600 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1601 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1602 sc->sc_comp, &iphdr, &hlen); 1603 1604 if (xlen < 0) { 1605 if (sc->sc_flags & SC_DEBUG) 1606 printf("%s: VJ uncompress failed on type uncomp\n", 1607 ifp->if_xname); 1608 goto bad; 1609 } 1610 1611 proto = PPP_IP; 1612 cp[3] = PPP_IP; 1613 } 1614 #endif /* VJC */ 1615 1616 /* 1617 * If the packet will fit in a header mbuf, don't waste a 1618 * whole cluster on it. 1619 */ 1620 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1621 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1622 if (mp != NULL) { 1623 m_copydata(m, 0, ilen, mtod(mp, caddr_t)); 1624 m_freem(m); 1625 m = mp; 1626 m->m_len = ilen; 1627 } 1628 } 1629 m->m_pkthdr.len = ilen; 1630 m->m_pkthdr.rcvif = ifp; 1631 1632 if ((proto & 0x8000) == 0) { 1633 #ifdef PPP_FILTER 1634 /* 1635 * See whether we want to pass this packet, and 1636 * if it counts as link activity. 1637 */ 1638 if (sc->sc_pass_filt_in.bf_insns != 0 1639 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *) m, 1640 ilen, 0) == 0) { 1641 /* drop this packet */ 1642 m_freem(m); 1643 return; 1644 } 1645 if (sc->sc_active_filt_in.bf_insns == 0 1646 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *) m, 1647 ilen, 0)) 1648 sc->sc_last_recv = time_second; 1649 #else 1650 /* 1651 * Record the time that we received this packet. 1652 */ 1653 sc->sc_last_recv = time_second; 1654 #endif /* PPP_FILTER */ 1655 } 1656 1657 #if NBPFILTER > 0 1658 /* See if bpf wants to look at the packet. */ 1659 if (sc->sc_if.if_bpf) 1660 bpf_mtap(sc->sc_if.if_bpf, m); 1661 #endif 1662 1663 rv = 0; 1664 switch (proto) { 1665 #ifdef INET 1666 case PPP_IP: 1667 /* 1668 * IP packet - take off the ppp header and pass it up to IP. 1669 */ 1670 if ((ifp->if_flags & IFF_UP) == 0 1671 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1672 /* interface is down - drop the packet. */ 1673 m_freem(m); 1674 return; 1675 } 1676 m->m_pkthdr.len -= PPP_HDRLEN; 1677 m->m_data += PPP_HDRLEN; 1678 m->m_len -= PPP_HDRLEN; 1679 #ifdef GATEWAY 1680 if (ipflow_fastforward(m)) 1681 return; 1682 #endif 1683 schednetisr(NETISR_IP); 1684 inq = &ipintrq; 1685 break; 1686 #endif 1687 1688 #ifdef INET6 1689 case PPP_IPV6: 1690 /* 1691 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1692 */ 1693 if ((ifp->if_flags & IFF_UP) == 0 1694 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1695 /* interface is down - drop the packet. */ 1696 m_freem(m); 1697 return; 1698 } 1699 m->m_pkthdr.len -= PPP_HDRLEN; 1700 m->m_data += PPP_HDRLEN; 1701 m->m_len -= PPP_HDRLEN; 1702 schednetisr(NETISR_IPV6); 1703 inq = &ip6intrq; 1704 break; 1705 #endif 1706 1707 default: 1708 /* 1709 * Some other protocol - place on input queue for read(). 1710 */ 1711 inq = &sc->sc_inq; 1712 rv = 1; 1713 break; 1714 } 1715 1716 /* 1717 * Put the packet on the appropriate input queue. 1718 */ 1719 s = splnet(); 1720 if (IF_QFULL(inq)) { 1721 IF_DROP(inq); 1722 splx(s); 1723 if (sc->sc_flags & SC_DEBUG) 1724 printf("%s: input queue full\n", ifp->if_xname); 1725 ifp->if_iqdrops++; 1726 goto bad; 1727 } 1728 IF_ENQUEUE(inq, m); 1729 splx(s); 1730 ifp->if_ipackets++; 1731 ifp->if_ibytes += ilen; 1732 1733 if (rv) 1734 (*sc->sc_ctlp)(sc); 1735 1736 return; 1737 1738 bad: 1739 m_freem(m); 1740 sc->sc_if.if_ierrors++; 1741 sc->sc_stats.ppp_ierrors++; 1742 } 1743 1744 #define MAX_DUMP_BYTES 128 1745 1746 static void 1747 pppdumpm(struct mbuf *m0) 1748 { 1749 char buf[3*MAX_DUMP_BYTES+4]; 1750 char *bp = buf; 1751 struct mbuf *m; 1752 1753 for (m = m0; m; m = m->m_next) { 1754 int l = m->m_len; 1755 u_char *rptr = (u_char *)m->m_data; 1756 1757 while (l--) { 1758 if (bp > buf + sizeof(buf) - 4) 1759 goto done; 1760 *bp++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */ 1761 *bp++ = hexdigits[*rptr++ & 0xf]; 1762 } 1763 1764 if (m->m_next) { 1765 if (bp > buf + sizeof(buf) - 3) 1766 goto done; 1767 *bp++ = '|'; 1768 } else 1769 *bp++ = ' '; 1770 } 1771 done: 1772 if (m) 1773 *bp++ = '>'; 1774 *bp = 0; 1775 printf("%s\n", buf); 1776 } 1777 1778 #ifdef ALTQ 1779 /* 1780 * a wrapper to transmit a packet from if_start since ALTQ uses 1781 * if_start to send a packet. 1782 */ 1783 static void 1784 ppp_ifstart(struct ifnet *ifp) 1785 { 1786 struct ppp_softc *sc; 1787 1788 sc = ifp->if_softc; 1789 (*sc->sc_start)(sc); 1790 } 1791 #endif 1792
Indexes created Fri Oct 03 02:09:57 GMT 2025