if_pppoe.c revision 1.19
1 /* $NetBSD: if_pppoe.c,v 1.19 2002/02/01 13:40:16 martin Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Martin Husemann. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.19 2002/02/01 13:40:16 martin Exp $"); 31 32 #include "pppoe.h" 33 #include "bpfilter.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/callout.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/socket.h> 42 #include <sys/proc.h> 43 #include <sys/ioctl.h> 44 #include <net/if.h> 45 #include <net/if_types.h> 46 #include <net/if_ether.h> 47 #include <net/if_sppp.h> 48 #include <net/if_spppvar.h> 49 #include <net/if_pppoe.h> 50 51 #if NBPFILTER > 0 52 #include <net/bpf.h> 53 #endif 54 55 #include <machine/intr.h> 56 57 #undef PPPOE_DEBUG /* XXX - remove this or make it an option */ 58 /* #define PPPOE_DEBUG 1 */ 59 60 #define PPPOE_HEADERLEN 6 61 #define PPPOE_VERTYPE 0x11 /* VER=1, TYPE = 1 */ 62 63 #define PPPOE_TAG_EOL 0x0000 /* end of list */ 64 #define PPPOE_TAG_SNAME 0x0101 /* service name */ 65 #define PPPOE_TAG_ACNAME 0x0102 /* access concentrator name */ 66 #define PPPOE_TAG_HUNIQUE 0x0103 /* host unique */ 67 #define PPPOE_TAG_ACCOOKIE 0x0104 /* AC cookie */ 68 #define PPPOE_TAG_VENDOR 0x0105 /* vendor specific */ 69 #define PPPOE_TAG_RELAYSID 0x0110 /* relay session id */ 70 #define PPPOE_TAG_SNAME_ERR 0x0201 /* service name error */ 71 #define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */ 72 #define PPPOE_TAG_GENERIC_ERR 0x0203 /* gerneric error */ 73 74 #define PPPOE_CODE_PADI 0x09 /* Active Discovery Initiation */ 75 #define PPPOE_CODE_PADO 0x07 /* Active Discovery Offer */ 76 #define PPPOE_CODE_PADR 0x19 /* Active Discovery Request */ 77 #define PPPOE_CODE_PADS 0x65 /* Active Discovery Session confirmation */ 78 #define PPPOE_CODE_PADT 0xA7 /* Active Discovery Terminate */ 79 80 /* two byte PPP protocol discriminator, then IP data */ 81 #define PPPOE_MAXMTU (ETHERMTU-PPPOE_HEADERLEN-2) 82 83 /* Read a 16 bit unsigned value from a buffer */ 84 #define PPPOE_READ_16(PTR, VAL) \ 85 (VAL) = ((PTR)[0] << 8) | (PTR)[1]; \ 86 (PTR)+=2 87 88 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */ 89 #define PPPOE_ADD_16(PTR, VAL) \ 90 *(PTR)++ = (VAL) / 256; \ 91 *(PTR)++ = (VAL) % 256 92 93 /* Add a complete PPPoE header to the buffer pointed to by PTR */ 94 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \ 95 *(PTR)++ = PPPOE_VERTYPE; \ 96 *(PTR)++ = (CODE); \ 97 PPPOE_ADD_16(PTR, SESS); \ 98 PPPOE_ADD_16(PTR, LEN) 99 100 #define PPPOE_DISC_TIMEOUT (hz*5) /* base for quick timeout calculation */ 101 #define PPPOE_SLOW_RETRY (hz*60) /* persistent retry interval */ 102 #define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */ 103 #define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */ 104 105 struct pppoe_softc { 106 struct sppp sc_sppp; /* contains a struct ifnet as first element */ 107 LIST_ENTRY(pppoe_softc) sc_list; 108 struct ifnet *sc_eth_if; /* ethernet interface we are using */ 109 110 int sc_state; /* discovery phase or session connected */ 111 struct ether_addr sc_dest; /* hardware address of concentrator */ 112 u_int16_t sc_session; /* PPPoE session id */ 113 114 char *sc_service_name; /* if != NULL: requested name of service */ 115 char *sc_concentrator_name; /* if != NULL: requested concentrator id */ 116 u_int8_t *sc_ac_cookie; /* content of AC cookie we must echo back */ 117 size_t sc_ac_cookie_len; /* length of cookie data */ 118 struct callout sc_timeout; /* timeout while not in session state */ 119 int sc_padi_retried; /* number of PADI retries already done */ 120 int sc_padr_retried; /* number of PADR retries already done */ 121 }; 122 123 /* incoming traffic will be queued here */ 124 struct ifqueue ppoediscinq = { NULL }; 125 struct ifqueue ppoeinq = { NULL }; 126 127 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 128 void * pppoe_softintr = NULL; 129 static void pppoe_softintr_handler(void *); 130 #else 131 struct callout pppoe_softintr = CALLOUT_INITIALIZER; 132 void pppoe_softintr_handler(void*); 133 #endif 134 135 extern int sppp_ioctl(struct ifnet *ifp, unsigned long cmd, void *data); 136 137 /* input routines */ 138 static void pppoe_input(void); 139 static void pppoe_disc_input(struct mbuf *m); 140 static void pppoe_dispatch_disc_pkt(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh); 141 static void pppoe_data_input(struct mbuf *m); 142 143 /* management routines */ 144 void pppoeattach(int count); 145 static int pppoe_connect(struct pppoe_softc *sc); 146 static int pppoe_disconnect(struct pppoe_softc *sc); 147 static void pppoe_abort_connect(struct pppoe_softc *sc); 148 static int pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data); 149 static void pppoe_tls(struct sppp *sp); 150 static void pppoe_tlf(struct sppp *sp); 151 static void pppoe_start(struct ifnet *ifp); 152 153 /* internal timeout handling */ 154 static void pppoe_timeout(void*); 155 156 /* sending actual protocol controll packets */ 157 static int pppoe_send_padi(struct pppoe_softc *sc); 158 static int pppoe_send_padr(struct pppoe_softc *sc); 159 static int pppoe_send_padt(struct pppoe_softc *sc); 160 161 /* raw output */ 162 static int pppoe_output(struct pppoe_softc *sc, struct mbuf *m); 163 164 /* internal helper functions */ 165 static struct pppoe_softc * pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif); 166 static struct pppoe_softc * pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif); 167 168 LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list; 169 170 int pppoe_clone_create __P((struct if_clone *, int)); 171 void pppoe_clone_destroy __P((struct ifnet *)); 172 173 struct if_clone pppoe_cloner = 174 IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy); 175 176 /* ARGSUSED */ 177 void 178 pppoeattach(count) 179 int count; 180 { 181 LIST_INIT(&pppoe_softc_list); 182 if_clone_attach(&pppoe_cloner); 183 184 ppoediscinq.ifq_maxlen = IFQ_MAXLEN; 185 ppoeinq.ifq_maxlen = IFQ_MAXLEN; 186 187 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 188 pppoe_softintr = softintr_establish(IPL_SOFTNET, pppoe_softintr_handler, NULL); 189 #endif 190 } 191 192 int 193 pppoe_clone_create(ifc, unit) 194 struct if_clone *ifc; 195 int unit; 196 { 197 struct pppoe_softc *sc; 198 199 sc = malloc(sizeof(struct pppoe_softc), M_DEVBUF, M_WAITOK); 200 memset(sc, 0, sizeof(struct pppoe_softc)); 201 202 sprintf(sc->sc_sppp.pp_if.if_xname, "pppoe%d", unit); 203 sc->sc_sppp.pp_if.if_softc = sc; 204 sc->sc_sppp.pp_if.if_mtu = PPPOE_MAXMTU; 205 sc->sc_sppp.pp_if.if_flags = IFF_SIMPLEX|IFF_POINTOPOINT|IFF_MULTICAST; 206 sc->sc_sppp.pp_if.if_type = IFT_PPP; 207 sc->sc_sppp.pp_if.if_hdrlen = sizeof(struct ether_header)+PPPOE_HEADERLEN; 208 sc->sc_sppp.pp_if.if_dlt = DLT_PPP_ETHER; 209 sc->sc_sppp.pp_flags |= PP_KEEPALIVE| /* use LCP keepalive */ 210 PP_NOFRAMING; /* no serial encapsulation */ 211 sc->sc_sppp.pp_if.if_ioctl = pppoe_ioctl; 212 IFQ_SET_MAXLEN(&sc->sc_sppp.pp_if.if_snd, IFQ_MAXLEN); 213 IFQ_SET_READY(&sc->sc_sppp.pp_if.if_snd); 214 215 /* changed to real address later */ 216 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 217 218 callout_init(&sc->sc_timeout); 219 220 sc->sc_sppp.pp_if.if_start = pppoe_start; 221 sc->sc_sppp.pp_tls = pppoe_tls; 222 sc->sc_sppp.pp_tlf = pppoe_tlf; 223 sc->sc_sppp.pp_framebytes = PPPOE_HEADERLEN; /* framing added to ppp packets */ 224 225 if_attach(&sc->sc_sppp.pp_if); 226 sppp_attach(&sc->sc_sppp.pp_if); 227 228 #if NBPFILTER > 0 229 bpfattach(&sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0); 230 #endif 231 LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list); 232 return 0; 233 } 234 235 void 236 pppoe_clone_destroy(ifp) 237 struct ifnet *ifp; 238 { 239 struct pppoe_softc * sc = ifp->if_softc; 240 241 LIST_REMOVE(sc, sc_list); 242 #if NBPFILTER > 0 243 bpfdetach(ifp); 244 #endif 245 sppp_detach(&sc->sc_sppp.pp_if); 246 if_detach(ifp); 247 free(sc, M_DEVBUF); 248 } 249 250 /* 251 * Find the interface handling the specified session. 252 * Note: O(number of sessions open), this is a client-side only, mean 253 * and lean implementation, so number of open sessions typically should 254 * be 1. 255 */ 256 static struct pppoe_softc * 257 pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif) 258 { 259 struct pppoe_softc *sc; 260 261 if (session == 0) return NULL; 262 263 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { 264 if (sc->sc_state == PPPOE_STATE_SESSION 265 && sc->sc_session == session) { 266 if (sc->sc_eth_if == rcvif) 267 return sc; 268 else 269 return NULL; 270 } 271 } 272 return NULL; 273 } 274 275 /* Check host unique token passed and return appropriate softc pointer, 276 * or NULL if token is bogus. */ 277 static struct pppoe_softc * 278 pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif) 279 { 280 struct pppoe_softc *sc, *t; 281 282 if (LIST_EMPTY(&pppoe_softc_list)) return NULL; 283 284 if (len != sizeof sc) return NULL; 285 memcpy(&t, token, len); 286 287 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) 288 if (sc == t) break; 289 290 if (sc != t) { 291 #ifdef PPPOE_DEBUG 292 printf("pppoe: alien host unique tag, no session found\n"); 293 #endif 294 return NULL; 295 } 296 297 /* should be safe to access *sc now */ 298 if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) { 299 printf("%s: host unique tag found, but it belongs to a connection in state %d\n", 300 sc->sc_sppp.pp_if.if_xname, sc->sc_state); 301 return NULL; 302 } 303 if (sc->sc_eth_if != rcvif) { 304 printf("%s: wrong interface, not accepting host unique\n", 305 sc->sc_sppp.pp_if.if_xname); 306 return NULL; 307 } 308 return sc; 309 } 310 311 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 312 static void pppoe_softintr_handler(void *dummy) 313 { 314 /* called at splsoftnet() */ 315 pppoe_input(); 316 } 317 #else 318 void pppoe_softintr_handler(void *dummy) 319 { 320 int s = splnet(); 321 pppoe_input(); 322 callout_deactivate(&pppoe_softintr); 323 splx(s); 324 } 325 #endif 326 327 /* called at appropriate protection level */ 328 static void 329 pppoe_input() 330 { 331 struct mbuf *m; 332 int s, disc_done, data_done; 333 334 do { 335 disc_done = 0; 336 data_done = 0; 337 for (;;) { 338 s = splnet(); 339 IF_DEQUEUE(&ppoediscinq, m); 340 splx(s); 341 if (m == NULL) break; 342 disc_done = 1; 343 pppoe_disc_input(m); 344 } 345 346 for (;;) { 347 s = splnet(); 348 IF_DEQUEUE(&ppoeinq, m); 349 splx(s); 350 if (m == NULL) break; 351 data_done = 1; 352 pppoe_data_input(m); 353 } 354 } while (disc_done || data_done); 355 } 356 357 /* analyze and handle a single received packet while not in session state */ 358 static void pppoe_dispatch_disc_pkt(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh) 359 { 360 u_int16_t tag, len; 361 u_int8_t vertype, code; 362 u_int16_t session, plen; 363 struct pppoe_softc *sc; 364 const char *err_msg = NULL; 365 u_int8_t * ac_cookie; 366 size_t ac_cookie_len; 367 368 ac_cookie = NULL; 369 ac_cookie_len = 0; 370 session = 0; 371 if (size <= PPPOE_HEADERLEN) { 372 printf("pppoe: packet too short: %ld\n", (long)size); 373 return; 374 } 375 vertype = *p++; 376 if (vertype != PPPOE_VERTYPE) { 377 printf("pppoe: unknown version/type packet: 0x%x\n", vertype); 378 return; 379 } 380 code = *p++; 381 PPPOE_READ_16(p, session); 382 PPPOE_READ_16(p, plen); 383 size -= PPPOE_HEADERLEN; 384 385 if (plen > size) { 386 printf("pppoe: packet content does not fit: data available = %ld, packet size = %ld\n", 387 (long)size, (long)plen); 388 return; 389 } 390 size = plen; /* ignore trailing garbage */ 391 tag = 0; 392 len = 0; 393 sc = NULL; 394 while (size > 4) { 395 PPPOE_READ_16(p, tag); 396 PPPOE_READ_16(p, len); 397 if (len > size) { 398 printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len); 399 return; 400 } 401 switch (tag) { 402 case PPPOE_TAG_EOL: 403 size = 0; break; 404 case PPPOE_TAG_SNAME: 405 break; /* ignored */ 406 case PPPOE_TAG_ACNAME: 407 break; /* ignored */ 408 case PPPOE_TAG_HUNIQUE: 409 if (sc == NULL) 410 sc = pppoe_find_softc_by_hunique(p, len, rcvif); 411 break; 412 case PPPOE_TAG_ACCOOKIE: 413 if (ac_cookie == NULL) { 414 ac_cookie = p; 415 ac_cookie_len = len; 416 } 417 break; 418 case PPPOE_TAG_SNAME_ERR: 419 err_msg = "SERVICE NAME ERROR"; 420 break; 421 case PPPOE_TAG_ACSYS_ERR: 422 err_msg = "AC SYSTEM ERROR"; 423 break; 424 case PPPOE_TAG_GENERIC_ERR: 425 err_msg = "GENERIC ERROR"; 426 break; 427 } 428 if (err_msg) { 429 printf("%s: %s\n", sc? sc->sc_sppp.pp_if.if_xname : "pppoe", 430 err_msg); 431 return; 432 } 433 if (size >= 0) { 434 size -= 4 + len; 435 if (len > 0) 436 p += len; 437 } 438 } 439 switch (code) { 440 case PPPOE_CODE_PADI: 441 case PPPOE_CODE_PADR: 442 /* ignore, we are no access concentrator */ 443 return; 444 case PPPOE_CODE_PADO: 445 if (sc == NULL) { 446 printf("pppoe: received PADO but could not find request for it\n"); 447 return; 448 } 449 if (sc->sc_state != PPPOE_STATE_PADI_SENT) { 450 printf("%s: received unexpected PADO\n", sc->sc_sppp.pp_if.if_xname); 451 return; 452 } 453 if (ac_cookie) { 454 sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF, M_DONTWAIT); 455 if (sc->sc_ac_cookie == NULL) 456 return; 457 sc->sc_ac_cookie_len = ac_cookie_len; 458 memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len); 459 } 460 memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest); 461 callout_stop(&sc->sc_timeout); 462 sc->sc_padr_retried = 0; 463 sc->sc_state = PPPOE_STATE_PADR_SENT; 464 if (pppoe_send_padr(sc) == 0) 465 callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc); 466 else 467 pppoe_abort_connect(sc); 468 break; 469 case PPPOE_CODE_PADS: 470 if (sc == NULL) 471 return; 472 sc->sc_session = session; 473 callout_stop(&sc->sc_timeout); 474 printf("%s: session 0x%x connected\n", sc->sc_sppp.pp_if.if_xname, session); 475 sc->sc_state = PPPOE_STATE_SESSION; 476 sc->sc_sppp.pp_up(&sc->sc_sppp); /* notify upper layers */ 477 break; 478 case PPPOE_CODE_PADT: 479 if (sc == NULL) 480 return; 481 /* stop timer (we might be about to transmit a PADT ourself) */ 482 callout_stop(&sc->sc_timeout); 483 /* signal upper layer */ 484 printf("%s: session 0x%x terminated, received PADT\n", sc->sc_sppp.pp_if.if_xname, session); 485 /* clean up softc */ 486 sc->sc_state = PPPOE_STATE_INITIAL; 487 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 488 if (sc->sc_ac_cookie) { 489 free(sc->sc_ac_cookie, M_MBUF); 490 sc->sc_ac_cookie = NULL; 491 } 492 sc->sc_ac_cookie_len = 0; 493 sc->sc_session = 0; 494 sc->sc_sppp.pp_down(&sc->sc_sppp); 495 break; 496 default: 497 printf("%s: unknown code (0x%04x) session = 0x%04x\n", 498 sc? sc->sc_sppp.pp_if.if_xname : "pppoe", 499 code, session); 500 break; 501 } 502 } 503 504 static void 505 pppoe_disc_input(struct mbuf *m) 506 { 507 u_int8_t *p; 508 struct ether_header *eh; 509 510 eh = mtod(m, struct ether_header*); 511 m_adj(m, sizeof(struct ether_header)); 512 p = mtod(m, u_int8_t*); 513 KASSERT(m->m_flags & M_PKTHDR); 514 pppoe_dispatch_disc_pkt(p, m->m_len, m->m_pkthdr.rcvif, eh); 515 m_free(m); 516 } 517 518 static void 519 pppoe_data_input(struct mbuf *m) 520 { 521 u_int8_t *p, vertype; 522 u_int16_t session, plen, code; 523 struct pppoe_softc *sc; 524 525 KASSERT(m->m_flags & M_PKTHDR); 526 527 m_adj(m, sizeof(struct ether_header)); 528 if (m->m_pkthdr.len <= PPPOE_HEADERLEN) { 529 printf("pppoe (data): dropping too short packet: %ld bytes\n", (long)m->m_pkthdr.len); 530 goto drop; 531 } 532 533 p = mtod(m, u_int8_t*); 534 535 vertype = *p++; 536 if (vertype != PPPOE_VERTYPE) { 537 printf("pppoe (data): unknown version/type packet: 0x%x\n", vertype); 538 goto drop; 539 } 540 541 code = *p++; 542 if (code != 0) 543 goto drop; 544 545 PPPOE_READ_16(p, session); 546 sc = pppoe_find_softc_by_session(session, m->m_pkthdr.rcvif); 547 if (sc == NULL) 548 goto drop; 549 550 PPPOE_READ_16(p, plen); 551 552 #if NBPFILTER > 0 553 if(sc->sc_sppp.pp_if.if_bpf) 554 bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m); 555 #endif 556 557 m_adj(m, PPPOE_HEADERLEN); 558 559 #ifdef PPPOE_DEBUG 560 { 561 struct mbuf *p; 562 563 printf("%s: pkthdr.len=%d, pppoe.len=%d", 564 sc->sc_sppp.pp_if.if_xname, 565 m->m_pkthdr.len, plen); 566 p = m; 567 while (p) { 568 printf(" l=%d", p->m_len); 569 p = p->m_next; 570 } 571 printf("\n"); 572 } 573 #endif 574 575 if (m->m_pkthdr.len < plen) 576 goto drop; 577 578 /* fix incoming interface pointer (not the raw ethernet interface anymore) */ 579 m->m_pkthdr.rcvif = &sc->sc_sppp.pp_if; 580 581 /* pass packet up and account for it */ 582 sc->sc_sppp.pp_if.if_ipackets++; 583 sppp_input(&sc->sc_sppp.pp_if, m); 584 return; 585 586 drop: 587 m_free(m); 588 } 589 590 static int 591 pppoe_output(struct pppoe_softc *sc, struct mbuf *m) 592 { 593 struct sockaddr dst; 594 struct ether_header *eh; 595 u_int16_t etype; 596 597 if (sc->sc_eth_if == NULL) 598 return EIO; 599 600 memset(&dst, 0, sizeof dst); 601 dst.sa_family = AF_UNSPEC; 602 eh = (struct ether_header*)&dst.sa_data; 603 etype = sc->sc_state == PPPOE_STATE_SESSION? ETHERTYPE_PPPOE : ETHERTYPE_PPPOEDISC; 604 eh->ether_type = htons(etype); 605 memcpy(&eh->ether_dhost, &sc->sc_dest, sizeof sc->sc_dest); 606 607 #ifdef PPPOE_DEBUG 608 printf("%s (%x) state=%d, session=0x%x output -> %s, len=%d\n", 609 sc->sc_sppp.pp_if.if_xname, etype, 610 sc->sc_state, sc->sc_session, 611 ether_sprintf((const unsigned char *)&sc->sc_dest), m->m_pkthdr.len); 612 #endif 613 614 sc->sc_sppp.pp_if.if_opackets++; 615 return sc->sc_eth_if->if_output(sc->sc_eth_if, m, &dst, NULL); 616 } 617 618 static int 619 pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data) 620 { 621 struct proc *p = curproc; /* XXX */ 622 struct pppoe_softc *sc = (struct pppoe_softc*)ifp; 623 int error = 0; 624 625 switch (cmd) { 626 case PPPOESETPARMS: 627 { 628 struct pppoediscparms *parms = (struct pppoediscparms*)data; 629 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 630 return error; 631 if (parms->eth_ifname[0] != 0) { 632 sc->sc_eth_if = ifunit(parms->eth_ifname); 633 if (sc->sc_eth_if == NULL) 634 return ENXIO; 635 } 636 if (parms->ac_name) { 637 size_t s; 638 char * p = malloc(parms->ac_name_len + 1, M_DEVBUF, M_WAITOK); 639 copyinstr(parms->ac_name, p, parms->ac_name_len, &s); 640 if (sc->sc_concentrator_name) 641 free(sc->sc_concentrator_name, M_DEVBUF); 642 sc->sc_concentrator_name = p; 643 } 644 if (parms->service_name) { 645 size_t s; 646 char * p = malloc(parms->service_name_len + 1, M_DEVBUF, M_WAITOK); 647 copyinstr(parms->service_name, p, parms->service_name_len, &s); 648 if (sc->sc_service_name) 649 free(sc->sc_service_name, M_DEVBUF); 650 sc->sc_service_name = p; 651 } 652 return 0; 653 } 654 break; 655 case PPPOEGETPARMS: 656 { 657 struct pppoediscparms *parms = (struct pppoediscparms*)data; 658 memset(parms, 0, sizeof *parms); 659 if (sc->sc_eth_if) 660 strncpy(parms->ifname, sc->sc_eth_if->if_xname, IFNAMSIZ); 661 return 0; 662 } 663 break; 664 case PPPOEGETSESSION: 665 { 666 struct pppoeconnectionstate *state = (struct pppoeconnectionstate*)data; 667 state->state = sc->sc_state; 668 state->session_id = sc->sc_session; 669 state->padi_retry_no = sc->sc_padi_retried; 670 state->padr_retry_no = sc->sc_padr_retried; 671 return 0; 672 } 673 break; 674 case SIOCSIFFLAGS: 675 { 676 struct ifreq *ifr = (struct ifreq*) data; 677 /* 678 * Prevent running re-establishment timers overriding 679 * administrators choice. 680 */ 681 if ((ifr->ifr_flags & IFF_UP) == 0 682 && sc->sc_state >= PPPOE_STATE_PADI_SENT 683 && sc->sc_state < PPPOE_STATE_SESSION) { 684 callout_stop(&sc->sc_timeout); 685 sc->sc_state = PPPOE_STATE_INITIAL; 686 sc->sc_padi_retried = 0; 687 sc->sc_padr_retried = 0; 688 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 689 } 690 return sppp_ioctl(ifp, cmd, data); 691 } 692 case SIOCSIFMTU: 693 { 694 struct ifreq *ifr = (struct ifreq*) data; 695 696 if (ifr->ifr_mtu > PPPOE_MAXMTU) 697 return EINVAL; 698 return sppp_ioctl(ifp, cmd, data); 699 } 700 default: 701 return sppp_ioctl(ifp, cmd, data); 702 } 703 return 0; 704 } 705 706 /* 707 * Allocate a mbuf/cluster with space to store the given data length 708 * of payload, leaving space for prepending an ethernet header 709 * in front. 710 */ 711 static struct mbuf * 712 pppoe_get_mbuf(size_t len) 713 { 714 struct mbuf *m; 715 716 MGETHDR(m, M_DONTWAIT, MT_DATA); 717 if (m == NULL) 718 return NULL; 719 if (len+sizeof(struct ether_header) > MHLEN) { 720 MCLGET(m, M_DONTWAIT); 721 if ((m->m_flags & M_EXT) == 0) { 722 struct mbuf *n; 723 MFREE(m, n); 724 return 0; 725 } 726 } 727 m->m_data += sizeof(struct ether_header); 728 m->m_len = len; 729 m->m_pkthdr.len = len; 730 m->m_pkthdr.rcvif = NULL; 731 732 return m; 733 } 734 735 static int 736 pppoe_send_padi(struct pppoe_softc *sc) 737 { 738 struct mbuf *m0; 739 int len, l1, l2; 740 u_int8_t *p; 741 742 if (sc->sc_state >PPPOE_STATE_PADI_SENT) 743 panic("pppoe_send_padi in state %d", sc->sc_state); 744 745 /* calculate length of frame (excluding ethernet header + pppoe header) */ 746 len = 2+2+2+2+sizeof sc; /* service name tag is required, host unique is send too */ 747 if (sc->sc_service_name != NULL) { 748 l1 = strlen(sc->sc_service_name); 749 len += l1; 750 } 751 if (sc->sc_concentrator_name != NULL) { 752 l2 = strlen(sc->sc_concentrator_name); 753 len += 2+2+l2; 754 } 755 756 /* allocate a buffer */ 757 m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN); /* header len + payload len */ 758 if (!m0) return ENOBUFS; 759 760 /* fill in pkt */ 761 p = mtod(m0, u_int8_t*); 762 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, len); 763 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 764 if (sc->sc_service_name != NULL) { 765 PPPOE_ADD_16(p, l1); 766 memcpy(p, sc->sc_service_name, l1); 767 p += l1; 768 } else { 769 PPPOE_ADD_16(p, 0); 770 } 771 if (sc->sc_concentrator_name != NULL) { 772 PPPOE_ADD_16(p, PPPOE_TAG_ACNAME); 773 PPPOE_ADD_16(p, l2); 774 memcpy(p, sc->sc_concentrator_name, l2); 775 p += l2; 776 } 777 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 778 PPPOE_ADD_16(p, sizeof(sc)); 779 memcpy(p, &sc, sizeof sc); 780 781 #ifdef PPPOE_DEBUG 782 p += sizeof sc; 783 if (p - mtod(m0, u_int8_t*) != len + PPPOE_HEADERLEN) 784 panic("pppoe_send_padi: garbled output len, should be %ld, is %ld", 785 (long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t*))); 786 #endif 787 788 /* send pkt */ 789 return pppoe_output(sc, m0); 790 } 791 792 static void 793 pppoe_timeout(void *arg) 794 { 795 int x, retry_wait; 796 struct pppoe_softc *sc = (struct pppoe_softc*)arg; 797 798 #ifdef PPPOE_DEBUG 799 printf("%s: timeout\n", sc->sc_sppp.pp_if.if_xname); 800 #endif 801 802 switch (sc->sc_state) { 803 case PPPOE_STATE_PADI_SENT: 804 /* 805 * We have two basic ways of retrying: 806 * - Quick retry mode: try a few times in short sequence 807 * - Slow retry mode: we already had a connection successfully 808 * established and will try infinitely (without user 809 * intervention) 810 * We only enter slow retry mode if IFF_LINK1 (aka autodial) 811 * is not set and we already had a successfull connection. 812 */ 813 814 /* initialize for quick retry mode */ 815 retry_wait = PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried); 816 817 x = splnet(); 818 sc->sc_padi_retried++; 819 if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) { 820 if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0 821 && sc->sc_sppp.pp_if.if_ibytes) { 822 /* slow retry mode */ 823 retry_wait = PPPOE_SLOW_RETRY; 824 } else { 825 pppoe_abort_connect(sc); 826 splx(x); 827 return; 828 } 829 } 830 if (pppoe_send_padi(sc) == 0) 831 callout_reset(&sc->sc_timeout, retry_wait, pppoe_timeout, sc); 832 else 833 pppoe_abort_connect(sc); 834 splx(x); 835 break; 836 837 case PPPOE_STATE_PADR_SENT: 838 x = splnet(); 839 sc->sc_padr_retried++; 840 if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) { 841 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 842 sc->sc_state = PPPOE_STATE_PADI_SENT; 843 sc->sc_padr_retried = 0; 844 if (pppoe_send_padi(sc) == 0) 845 callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried), pppoe_timeout, sc); 846 else 847 pppoe_abort_connect(sc); 848 splx(x); 849 return; 850 } 851 if (pppoe_send_padr(sc) == 0) 852 callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc); 853 else 854 pppoe_abort_connect(sc); 855 splx(x); 856 break; 857 case PPPOE_STATE_CLOSING: 858 pppoe_disconnect(sc); 859 break; 860 default: 861 return; /* all done, work in peace */ 862 } 863 } 864 865 /* Start a connection (i.e. initiate discovery phase) */ 866 static int 867 pppoe_connect(struct pppoe_softc *sc) 868 { 869 int x, err; 870 871 if (sc->sc_state != PPPOE_STATE_INITIAL) 872 return EBUSY; 873 874 x = splnet(); 875 sc->sc_state = PPPOE_STATE_PADI_SENT; 876 sc->sc_padr_retried = 0; 877 err = pppoe_send_padi(sc); 878 if (err == 0) 879 callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT, pppoe_timeout, sc); 880 else 881 pppoe_abort_connect(sc); 882 splx(x); 883 return err; 884 } 885 886 /* disconnect */ 887 static int 888 pppoe_disconnect(struct pppoe_softc *sc) 889 { 890 int err, x; 891 892 x = splnet(); 893 894 if (sc->sc_state < PPPOE_STATE_SESSION) 895 err = EBUSY; 896 else { 897 printf("%s: disconnecting\n", sc->sc_sppp.pp_if.if_xname); 898 err = pppoe_send_padt(sc); 899 } 900 901 /* cleanup softc */ 902 sc->sc_state = PPPOE_STATE_INITIAL; 903 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 904 if (sc->sc_ac_cookie) { 905 free(sc->sc_ac_cookie, M_MBUF); 906 sc->sc_ac_cookie = NULL; 907 } 908 sc->sc_ac_cookie_len = 0; 909 sc->sc_session = 0; 910 911 /* notify upper layer */ 912 sc->sc_sppp.pp_down(&sc->sc_sppp); 913 914 splx(x); 915 916 return err; 917 } 918 919 /* Connection attempt aborted */ 920 static void 921 pppoe_abort_connect(struct pppoe_softc *sc) 922 { 923 printf("%s: could not establish connection\n", 924 sc->sc_sppp.pp_if.if_xname); 925 sc->sc_state = PPPOE_STATE_INITIAL; 926 memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); 927 928 /* notify upper layer */ 929 sc->sc_sppp.pp_down(&sc->sc_sppp); 930 } 931 932 /* Send a PADR packet */ 933 static int 934 pppoe_send_padr(struct pppoe_softc *sc) 935 { 936 struct mbuf *m0; 937 u_int8_t *p; 938 size_t len, l1; 939 940 if (sc->sc_state != PPPOE_STATE_PADR_SENT) 941 return EIO; 942 943 len = 2+2+2+2+sizeof(sc); /* service name, host unique */ 944 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ 945 l1 = strlen(sc->sc_service_name); 946 len += l1; 947 } 948 if (sc->sc_ac_cookie_len > 0) 949 len += 2+2+sc->sc_ac_cookie_len; /* AC cookie */ 950 m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN); 951 if (!m0) return ENOBUFS; 952 p = mtod(m0, u_int8_t*); 953 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len); 954 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 955 if (sc->sc_service_name != NULL) { 956 PPPOE_ADD_16(p, l1); 957 memcpy(p, sc->sc_service_name, l1); 958 p += l1; 959 } else { 960 PPPOE_ADD_16(p, 0); 961 } 962 if (sc->sc_ac_cookie_len > 0) { 963 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); 964 PPPOE_ADD_16(p, sc->sc_ac_cookie_len); 965 memcpy(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len); 966 p += sc->sc_ac_cookie_len; 967 } 968 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 969 PPPOE_ADD_16(p, sizeof(sc)); 970 memcpy(p, &sc, sizeof sc); 971 972 #ifdef PPPOE_DEBUG 973 p += sizeof sc; 974 if (p - mtod(m0, u_int8_t*) != len + PPPOE_HEADERLEN) 975 panic("pppoe_send_padr: garbled output len, should be %ld, is %ld", 976 (long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t*))); 977 #endif 978 979 return pppoe_output(sc, m0); 980 } 981 982 /* send a PADT packet */ 983 static int 984 pppoe_send_padt(struct pppoe_softc *sc) 985 { 986 struct mbuf *m0; 987 u_int8_t *p; 988 989 if (sc->sc_state < PPPOE_STATE_SESSION) 990 return EIO; 991 992 #ifdef PPPOE_DEBUG 993 printf("%s: sending PADT\n", sc->sc_sppp.pp_if.if_xname); 994 #endif 995 m0 = pppoe_get_mbuf(PPPOE_HEADERLEN); 996 if (!m0) return ENOBUFS; 997 p = mtod(m0, u_int8_t*); 998 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, sc->sc_session, 0); 999 return pppoe_output(sc, m0); 1000 } 1001 1002 static void 1003 pppoe_tls(struct sppp *sp) 1004 { 1005 struct pppoe_softc *sc = (void*)sp; 1006 if (sc->sc_state != PPPOE_STATE_INITIAL) 1007 return; 1008 pppoe_connect(sc); 1009 } 1010 1011 static void 1012 pppoe_tlf(struct sppp *sp) 1013 { 1014 struct pppoe_softc *sc = (void*)sp; 1015 if (sc->sc_state < PPPOE_STATE_SESSION) 1016 return; 1017 /* 1018 * Do not call pppoe_disconnect here, the upper layer state 1019 * machine gets confused by this. We must return from this 1020 * function and defer disconnecting to the timeout handler. 1021 */ 1022 sc->sc_state = PPPOE_STATE_CLOSING; 1023 callout_reset(&sc->sc_timeout, hz/50, pppoe_timeout, sc); 1024 } 1025 1026 static void 1027 pppoe_start(struct ifnet *ifp) 1028 { 1029 struct pppoe_softc *sc = (void*)ifp; 1030 struct mbuf *m; 1031 u_int8_t *p; 1032 size_t len; 1033 1034 if (sppp_isempty(ifp)) 1035 return; 1036 1037 /* are we read to proccess data yet? */ 1038 if (sc->sc_state < PPPOE_STATE_SESSION) { 1039 sppp_flush(&sc->sc_sppp.pp_if); 1040 return; 1041 } 1042 1043 while ((m = sppp_dequeue(ifp)) != NULL) { 1044 len = m->m_pkthdr.len; 1045 M_PREPEND(m, PPPOE_HEADERLEN, M_DONTWAIT); 1046 if (m == NULL) { 1047 m_free(m); 1048 break; 1049 } 1050 p = mtod(m, u_int8_t*); 1051 PPPOE_ADD_HEADER(p, 0, sc->sc_session, len); 1052 1053 #if NBPFILTER > 0 1054 if(sc->sc_sppp.pp_if.if_bpf) 1055 bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m); 1056 #endif 1057 1058 pppoe_output(sc, m); 1059 } 1060 } 1061
Indexes created Mon Sep 29 21:09:56 GMT 2025