1 2 /* 3 * ng_pppoe.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD: src/sys/netgraph/ng_pppoe.c,v 1.23.2.17 2002/07/02 22:17:18 archie Exp $ 40 * $DragonFly: src/sys/netgraph/pppoe/ng_pppoe.c,v 1.3 2003/08/07 21:17:32 dillon Exp $ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 #if 0 44 #define AAA printf("pppoe: %s\n", __FUNCTION__ ); 45 #define BBB printf("-%d-", __LINE__ ); 46 #else 47 #define AAA 48 #define BBB 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/kernel.h> 54 #include <sys/mbuf.h> 55 #include <sys/malloc.h> 56 #include <sys/errno.h> 57 #include <sys/sysctl.h> 58 #include <net/ethernet.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include "ng_pppoe.h" 63 64 #define SIGNOFF "session closed" 65 66 /* 67 * This section contains the netgraph method declarations for the 68 * pppoe node. These methods define the netgraph pppoe 'type'. 69 */ 70 71 static ng_constructor_t ng_pppoe_constructor; 72 static ng_rcvmsg_t ng_pppoe_rcvmsg; 73 static ng_shutdown_t ng_pppoe_rmnode; 74 static ng_newhook_t ng_pppoe_newhook; 75 static ng_connect_t ng_pppoe_connect; 76 static ng_rcvdata_t ng_pppoe_rcvdata; 77 static ng_disconnect_t ng_pppoe_disconnect; 78 79 /* Netgraph node type descriptor */ 80 static struct ng_type typestruct = { 81 NG_VERSION, 82 NG_PPPOE_NODE_TYPE, 83 NULL, 84 ng_pppoe_constructor, 85 ng_pppoe_rcvmsg, 86 ng_pppoe_rmnode, 87 ng_pppoe_newhook, 88 NULL, 89 ng_pppoe_connect, 90 ng_pppoe_rcvdata, 91 ng_pppoe_rcvdata, 92 ng_pppoe_disconnect, 93 NULL 94 }; 95 NETGRAPH_INIT(pppoe, &typestruct); 96 97 /* 98 * States for the session state machine. 99 * These have no meaning if there is no hook attached yet. 100 */ 101 enum state { 102 PPPOE_SNONE=0, /* [both] Initial state */ 103 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 104 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 105 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 106 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 107 PPPOE_SREQ, /* [Client] Sent a Request */ 108 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 109 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 110 PPPOE_DEAD /* [Both] */ 111 }; 112 113 #define NUMTAGS 20 /* number of tags we are set up to work with */ 114 115 /* 116 * Information we store for each hook on each node for negotiating the 117 * session. The mbuf and cluster are freed once negotiation has completed. 118 * The whole negotiation block is then discarded. 119 */ 120 121 struct sess_neg { 122 struct mbuf *m; /* holds cluster with last sent packet */ 123 union packet *pkt; /* points within the above cluster */ 124 struct callout_handle timeout_handle; /* see timeout(9) */ 125 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 126 u_int numtags; 127 const struct pppoe_tag *tags[NUMTAGS]; 128 u_int service_len; 129 u_int ac_name_len; 130 131 struct datatag service; 132 struct datatag ac_name; 133 }; 134 typedef struct sess_neg *negp; 135 136 /* 137 * Session information that is needed after connection. 138 */ 139 struct sess_con { 140 hook_p hook; 141 u_int16_t Session_ID; 142 enum state state; 143 char creator[NG_NODELEN + 1]; /* who to notify */ 144 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 145 negp neg; /* used when negotiating */ 146 /*struct sess_con *hash_next;*/ /* not yet used */ 147 }; 148 typedef struct sess_con *sessp; 149 150 /* 151 * Information we store for each node 152 */ 153 struct PPPOE { 154 node_p node; /* back pointer to node */ 155 hook_p ethernet_hook; 156 hook_p debug_hook; 157 u_int packets_in; /* packets in from ethernet */ 158 u_int packets_out; /* packets out towards ethernet */ 159 u_int32_t flags; 160 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 161 }; 162 typedef struct PPPOE *priv_p; 163 164 struct ether_header eh_prototype = 165 {{0xff,0xff,0xff,0xff,0xff,0xff}, 166 {0x00,0x00,0x00,0x00,0x00,0x00}, 167 ETHERTYPE_PPPOE_DISC}; 168 169 static int nonstandard; 170 static int 171 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 172 { 173 int error; 174 int val; 175 176 val = nonstandard; 177 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 178 if (error != 0 || req->newptr == NULL) 179 return (error); 180 if (val == 1) { 181 nonstandard = 1; 182 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 183 } else { 184 nonstandard = 0; 185 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 186 } 187 return (0); 188 } 189 190 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 191 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype"); 192 193 union uniq { 194 char bytes[sizeof(void *)]; 195 void * pointer; 196 }; 197 198 #define LEAVE(x) do { error = x; goto quit; } while(0) 199 static void pppoe_start(sessp sp); 200 static void sendpacket(sessp sp); 201 static void pppoe_ticker(void *arg); 202 static const struct pppoe_tag *scan_tags(sessp sp, 203 const struct pppoe_hdr* ph); 204 static int pppoe_send_event(sessp sp, enum cmd cmdid); 205 206 /************************************************************************* 207 * Some basic utilities from the Linux version with author's permission.* 208 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 209 ************************************************************************/ 210 211 /* 212 * Generate a new session id 213 * XXX find out the FreeBSD locking scheme. 214 */ 215 static u_int16_t 216 get_new_sid(node_p node) 217 { 218 static int pppoe_sid = 10; 219 sessp sp; 220 hook_p hook; 221 u_int16_t val; 222 priv_p privp = node->private; 223 224 AAA 225 restart: 226 val = pppoe_sid++; 227 /* 228 * Spec says 0xFFFF is reserved. 229 * Also don't use 0x0000 230 */ 231 if (val == 0xffff) { 232 pppoe_sid = 20; 233 goto restart; 234 } 235 236 /* Check it isn't already in use */ 237 LIST_FOREACH(hook, &node->hooks, hooks) { 238 /* don't check special hooks */ 239 if ((hook->private == &privp->debug_hook) 240 || (hook->private == &privp->ethernet_hook)) 241 continue; 242 sp = hook->private; 243 if (sp->Session_ID == val) 244 goto restart; 245 } 246 247 return val; 248 } 249 250 251 /* 252 * Return the location where the next tag can be put 253 */ 254 static __inline const struct pppoe_tag* 255 next_tag(const struct pppoe_hdr* ph) 256 { 257 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 258 + ntohs(ph->length)); 259 } 260 261 /* 262 * Look for a tag of a specific type 263 * Don't trust any length the other end says. 264 * but assume we already sanity checked ph->length. 265 */ 266 static const struct pppoe_tag* 267 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 268 { 269 const char *const end = (const char *)next_tag(ph); 270 const char *ptn; 271 const struct pppoe_tag *pt = &ph->tag[0]; 272 /* 273 * Keep processing tags while a tag header will still fit. 274 */ 275 AAA 276 while((const char*)(pt + 1) <= end) { 277 /* 278 * If the tag data would go past the end of the packet, abort. 279 */ 280 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 281 if(ptn > end) 282 return NULL; 283 284 if(pt->tag_type == idx) 285 return pt; 286 287 pt = (const struct pppoe_tag*)ptn; 288 } 289 return NULL; 290 } 291 292 /************************************************************************** 293 * inlines to initialise or add tags to a session's tag list, 294 **************************************************************************/ 295 /* 296 * Initialise the session's tag list 297 */ 298 static void 299 init_tags(sessp sp) 300 { 301 AAA 302 if(sp->neg == NULL) { 303 printf("pppoe: asked to init NULL neg pointer\n"); 304 return; 305 } 306 sp->neg->numtags = 0; 307 } 308 309 static void 310 insert_tag(sessp sp, const struct pppoe_tag *tp) 311 { 312 int i; 313 negp neg; 314 315 AAA 316 if((neg = sp->neg) == NULL) { 317 printf("pppoe: asked to use NULL neg pointer\n"); 318 return; 319 } 320 if ((i = neg->numtags++) < NUMTAGS) { 321 neg->tags[i] = tp; 322 } else { 323 printf("pppoe: asked to add too many tags to packet\n"); 324 neg->numtags--; 325 } 326 } 327 328 /* 329 * Make up a packet, using the tags filled out for the session. 330 * 331 * Assume that the actual pppoe header and ethernet header 332 * are filled out externally to this routine. 333 * Also assume that neg->wh points to the correct 334 * location at the front of the buffer space. 335 */ 336 static void 337 make_packet(sessp sp) { 338 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 339 const struct pppoe_tag **tag; 340 char *dp; 341 int count; 342 int tlen; 343 u_int16_t length = 0; 344 345 AAA 346 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 347 printf("pppoe: make_packet called from wrong state\n"); 348 } 349 dp = (char *)wh->ph.tag; 350 for (count = 0, tag = sp->neg->tags; 351 ((count < sp->neg->numtags) && (count < NUMTAGS)); 352 tag++, count++) { 353 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 354 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 355 printf("pppoe: tags too long\n"); 356 sp->neg->numtags = count; 357 break; /* XXX chop off what's too long */ 358 } 359 bcopy(*tag, (char *)dp, tlen); 360 length += tlen; 361 dp += tlen; 362 } 363 wh->ph.length = htons(length); 364 sp->neg->m->m_len = length + sizeof(*wh); 365 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 366 } 367 368 /************************************************************************** 369 * Routine to match a service offered * 370 **************************************************************************/ 371 /* 372 * Find a hook that has a service string that matches that 373 * we are seeking. for now use a simple string. 374 * In the future we may need something like regexp(). 375 * for testing allow a null string to match 1st found and a null service 376 * to match all requests. Also make '*' do the same. 377 */ 378 379 #define NG_MATCH_EXACT 1 380 #define NG_MATCH_ANY 2 381 382 static hook_p 383 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 384 { 385 sessp sp = NULL; 386 negp neg = NULL; 387 priv_p privp = node->private; 388 hook_p allhook = NULL; 389 hook_p hook; 390 391 AAA 392 LIST_FOREACH(hook, &node->hooks, hooks) { 393 394 /* skip any hook that is debug or ethernet */ 395 if ((hook->private == &privp->debug_hook) 396 || (hook->private == &privp->ethernet_hook)) 397 continue; 398 sp = hook->private; 399 400 /* Skip any sessions which are not in LISTEN mode. */ 401 if ( sp->state != PPPOE_LISTENING) 402 continue; 403 404 neg = sp->neg; 405 406 /* Special case for a blank or "*" service name (wildcard) */ 407 if (match == NG_MATCH_ANY && neg->service_len == 1 && 408 neg->service.data[0] == '*') { 409 allhook = hook; 410 continue; 411 } 412 413 /* If the lengths don't match, that aint it. */ 414 if (neg->service_len != svc_len) 415 continue; 416 417 /* An exact match? */ 418 if (svc_len == 0) 419 break; 420 421 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 422 break; 423 } 424 return (hook ? hook : allhook); 425 } 426 /************************************************************************** 427 * Routine to find a particular session that matches an incoming packet * 428 **************************************************************************/ 429 static hook_p 430 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 431 { 432 sessp sp = NULL; 433 hook_p hook = NULL; 434 priv_p privp = node->private; 435 u_int16_t session = ntohs(wh->ph.sid); 436 437 /* 438 * find matching peer/session combination. 439 */ 440 AAA 441 LIST_FOREACH(hook, &node->hooks, hooks) { 442 /* don't check special hooks */ 443 if ((hook->private == &privp->debug_hook) 444 || (hook->private == &privp->ethernet_hook)) { 445 continue; 446 } 447 sp = hook->private; 448 if ( ( (sp->state == PPPOE_CONNECTED) 449 || (sp->state == PPPOE_NEWCONNECTED) ) 450 && (sp->Session_ID == session) 451 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 452 wh->eh.ether_shost, 453 ETHER_ADDR_LEN)) == 0) { 454 break; 455 } 456 } 457 return (hook); 458 } 459 460 static hook_p 461 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 462 { 463 hook_p hook = NULL; 464 priv_p privp = node->private; 465 union uniq uniq; 466 467 AAA 468 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 469 /* cycle through all known hooks */ 470 LIST_FOREACH(hook, &node->hooks, hooks) { 471 /* don't check special hooks */ 472 if ((hook->private == &privp->debug_hook) 473 || (hook->private == &privp->ethernet_hook)) 474 continue; 475 if (uniq.pointer == hook->private) 476 break; 477 } 478 return (hook); 479 } 480 481 /************************************************************************** 482 * start of Netgraph entrypoints * 483 **************************************************************************/ 484 485 /* 486 * Allocate the private data structure and the generic node 487 * and link them together. 488 * 489 * ng_make_node_common() returns with a generic node struct 490 * with a single reference for us.. we transfer it to the 491 * private structure.. when we free the private struct we must 492 * unref the node so it gets freed too. 493 */ 494 static int 495 ng_pppoe_constructor(node_p *nodep) 496 { 497 priv_p privdata; 498 int error; 499 500 AAA 501 /* Initialize private descriptor */ 502 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, M_NOWAIT); 503 if (privdata == NULL) 504 return (ENOMEM); 505 bzero(privdata, sizeof(*privdata)); 506 507 /* Call the 'generic' (ie, superclass) node constructor */ 508 if ((error = ng_make_node_common(&typestruct, nodep))) { 509 FREE(privdata, M_NETGRAPH); 510 return (error); 511 } 512 513 /* Link structs together; this counts as our one reference to *nodep */ 514 (*nodep)->private = privdata; 515 privdata->node = *nodep; 516 return (0); 517 } 518 519 /* 520 * Give our ok for a hook to be added... 521 * point the hook's private info to the hook structure. 522 * 523 * The following hook names are special: 524 * Ethernet: the hook that should be connected to a NIC. 525 * debug: copies of data sent out here (when I write the code). 526 * All other hook names need only be unique. (the framework checks this). 527 */ 528 static int 529 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 530 { 531 const priv_p privp = node->private; 532 sessp sp; 533 534 AAA 535 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 536 privp->ethernet_hook = hook; 537 hook->private = &privp->ethernet_hook; 538 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 539 privp->debug_hook = hook; 540 hook->private = &privp->debug_hook; 541 } else { 542 /* 543 * Any other unique name is OK. 544 * The infrastructure has already checked that it's unique, 545 * so just allocate it and hook it in. 546 */ 547 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT); 548 if (sp == NULL) { 549 return (ENOMEM); 550 } 551 bzero(sp, sizeof(*sp)); 552 553 hook->private = sp; 554 sp->hook = hook; 555 } 556 return(0); 557 } 558 559 /* 560 * Get a netgraph control message. 561 * Check it is one we understand. If needed, send a response. 562 * We sometimes save the address for an async action later. 563 * Always free the message. 564 */ 565 static int 566 ng_pppoe_rcvmsg(node_p node, 567 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 568 { 569 priv_p privp = node->private; 570 struct ngpppoe_init_data *ourmsg = NULL; 571 struct ng_mesg *resp = NULL; 572 int error = 0; 573 hook_p hook = NULL; 574 sessp sp = NULL; 575 negp neg = NULL; 576 577 AAA 578 /* Deal with message according to cookie and command */ 579 switch (msg->header.typecookie) { 580 case NGM_PPPOE_COOKIE: 581 switch (msg->header.cmd) { 582 case NGM_PPPOE_CONNECT: 583 case NGM_PPPOE_LISTEN: 584 case NGM_PPPOE_OFFER: 585 case NGM_PPPOE_SERVICE: 586 ourmsg = (struct ngpppoe_init_data *)msg->data; 587 if (( sizeof(*ourmsg) > msg->header.arglen) 588 || ((sizeof(*ourmsg) + ourmsg->data_len) 589 > msg->header.arglen)) { 590 printf("pppoe_rcvmsg: bad arg size"); 591 LEAVE(EMSGSIZE); 592 } 593 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 594 printf("pppoe: init data too long (%d)\n", 595 ourmsg->data_len); 596 LEAVE(EMSGSIZE); 597 } 598 /* make sure strcmp will terminate safely */ 599 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 600 601 /* cycle through all known hooks */ 602 LIST_FOREACH(hook, &node->hooks, hooks) { 603 if (hook->name 604 && strcmp(hook->name, ourmsg->hook) == 0) 605 break; 606 } 607 if (hook == NULL) { 608 LEAVE(ENOENT); 609 } 610 if ((hook->private == &privp->debug_hook) 611 || (hook->private == &privp->ethernet_hook)) { 612 LEAVE(EINVAL); 613 } 614 sp = hook->private; 615 616 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 617 /* 618 * Ensure we aren't already listening for this 619 * service. 620 */ 621 if (pppoe_match_svc(node, ourmsg->data, 622 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 623 LEAVE(EEXIST); 624 } 625 } 626 627 /* 628 * PPPOE_SERVICE advertisments are set up 629 * on sessions that are in PRIMED state. 630 */ 631 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 632 break; 633 } 634 if (sp->state |= PPPOE_SNONE) { 635 printf("pppoe: Session already active\n"); 636 LEAVE(EISCONN); 637 } 638 639 /* 640 * set up prototype header 641 */ 642 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, M_NOWAIT); 643 644 if (neg == NULL) { 645 printf("pppoe: Session out of memory\n"); 646 LEAVE(ENOMEM); 647 } 648 bzero(neg, sizeof(*neg)); 649 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 650 if(neg->m == NULL) { 651 printf("pppoe: Session out of mbufs\n"); 652 FREE(neg, M_NETGRAPH); 653 LEAVE(ENOBUFS); 654 } 655 neg->m->m_pkthdr.rcvif = NULL; 656 MCLGET(neg->m, M_DONTWAIT); 657 if ((neg->m->m_flags & M_EXT) == 0) { 658 printf("pppoe: Session out of mcls\n"); 659 m_freem(neg->m); 660 FREE(neg, M_NETGRAPH); 661 LEAVE(ENOBUFS); 662 } 663 sp->neg = neg; 664 callout_handle_init( &neg->timeout_handle); 665 neg->m->m_len = sizeof(struct pppoe_full_hdr); 666 neg->pkt = mtod(neg->m, union packet*); 667 neg->pkt->pkt_header.eh = eh_prototype; 668 neg->pkt->pkt_header.ph.ver = 0x1; 669 neg->pkt->pkt_header.ph.type = 0x1; 670 neg->pkt->pkt_header.ph.sid = 0x0000; 671 neg->timeout = 0; 672 673 strncpy(sp->creator, retaddr, NG_NODELEN); 674 sp->creator[NG_NODELEN] = '\0'; 675 } 676 switch (msg->header.cmd) { 677 case NGM_PPPOE_GET_STATUS: 678 { 679 struct ngpppoestat *stats; 680 681 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 682 if (!resp) { 683 LEAVE(ENOMEM); 684 } 685 stats = (struct ngpppoestat *) resp->data; 686 stats->packets_in = privp->packets_in; 687 stats->packets_out = privp->packets_out; 688 break; 689 } 690 case NGM_PPPOE_CONNECT: 691 /* 692 * Check the hook exists and is Uninitialised. 693 * Send a PADI request, and start the timeout logic. 694 * Store the originator of this message so we can send 695 * a success of fail message to them later. 696 * Move the session to SINIT 697 * Set up the session to the correct state and 698 * start it. 699 */ 700 neg->service.hdr.tag_type = PTT_SRV_NAME; 701 neg->service.hdr.tag_len = 702 htons((u_int16_t)ourmsg->data_len); 703 if (ourmsg->data_len) { 704 bcopy(ourmsg->data, 705 neg->service.data, ourmsg->data_len); 706 } 707 neg->service_len = ourmsg->data_len; 708 pppoe_start(sp); 709 break; 710 case NGM_PPPOE_LISTEN: 711 /* 712 * Check the hook exists and is Uninitialised. 713 * Install the service matching string. 714 * Store the originator of this message so we can send 715 * a success of fail message to them later. 716 * Move the hook to 'LISTENING' 717 */ 718 neg->service.hdr.tag_type = PTT_SRV_NAME; 719 neg->service.hdr.tag_len = 720 htons((u_int16_t)ourmsg->data_len); 721 722 if (ourmsg->data_len) { 723 bcopy(ourmsg->data, 724 neg->service.data, ourmsg->data_len); 725 } 726 neg->service_len = ourmsg->data_len; 727 neg->pkt->pkt_header.ph.code = PADT_CODE; 728 /* 729 * wait for PADI packet coming from ethernet 730 */ 731 sp->state = PPPOE_LISTENING; 732 break; 733 case NGM_PPPOE_OFFER: 734 /* 735 * Check the hook exists and is Uninitialised. 736 * Store the originator of this message so we can send 737 * a success of fail message to them later. 738 * Store the AC-Name given and go to PRIMED. 739 */ 740 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 741 neg->ac_name.hdr.tag_len = 742 htons((u_int16_t)ourmsg->data_len); 743 if (ourmsg->data_len) { 744 bcopy(ourmsg->data, 745 neg->ac_name.data, ourmsg->data_len); 746 } 747 neg->ac_name_len = ourmsg->data_len; 748 neg->pkt->pkt_header.ph.code = PADO_CODE; 749 /* 750 * Wait for PADI packet coming from hook 751 */ 752 sp->state = PPPOE_PRIMED; 753 break; 754 case NGM_PPPOE_SERVICE: 755 /* 756 * Check the session is primed. 757 * for now just allow ONE service to be advertised. 758 * If you do it twice you just overwrite. 759 */ 760 if (sp->state != PPPOE_PRIMED) { 761 printf("pppoe: Session not primed\n"); 762 LEAVE(EISCONN); 763 } 764 neg = sp->neg; 765 neg->service.hdr.tag_type = PTT_SRV_NAME; 766 neg->service.hdr.tag_len = 767 htons((u_int16_t)ourmsg->data_len); 768 769 if (ourmsg->data_len) 770 bcopy(ourmsg->data, neg->service.data, 771 ourmsg->data_len); 772 neg->service_len = ourmsg->data_len; 773 break; 774 default: 775 LEAVE(EINVAL); 776 } 777 break; 778 default: 779 LEAVE(EINVAL); 780 } 781 782 /* Take care of synchronous response, if any */ 783 if (rptr) 784 *rptr = resp; 785 else if (resp) 786 FREE(resp, M_NETGRAPH); 787 788 /* Free the message and return */ 789 quit: 790 FREE(msg, M_NETGRAPH); 791 return(error); 792 } 793 794 /* 795 * Start a client into the first state. A separate function because 796 * it can be needed if the negotiation times out. 797 */ 798 static void 799 pppoe_start(sessp sp) 800 { 801 struct { 802 struct pppoe_tag hdr; 803 union uniq data; 804 } __attribute ((packed)) uniqtag; 805 806 /* 807 * kick the state machine into starting up 808 */ 809 AAA 810 sp->state = PPPOE_SINIT; 811 /* reset the packet header to broadcast */ 812 sp->neg->pkt->pkt_header.eh = eh_prototype; 813 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 814 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 815 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 816 uniqtag.data.pointer = sp; 817 init_tags(sp); 818 insert_tag(sp, &uniqtag.hdr); 819 insert_tag(sp, &sp->neg->service.hdr); 820 make_packet(sp); 821 sendpacket(sp); 822 } 823 824 static int 825 send_acname(sessp sp, const struct pppoe_tag *tag) 826 { 827 int error, tlen; 828 struct ng_mesg *msg; 829 struct ngpppoe_sts *sts; 830 831 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 832 sizeof(struct ngpppoe_sts), M_NOWAIT); 833 if (msg == NULL) 834 return (ENOMEM); 835 836 sts = (struct ngpppoe_sts *)msg->data; 837 tlen = min(NG_HOOKLEN, ntohs(tag->tag_len)); 838 strncpy(sts->hook, tag->tag_data, tlen); 839 sts->hook[tlen] = '\0'; 840 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 841 842 return (error); 843 } 844 845 static int 846 send_sessionid(sessp sp) 847 { 848 int error; 849 struct ng_mesg *msg; 850 851 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 852 sizeof(u_int16_t), M_NOWAIT); 853 if (msg == NULL) 854 return (ENOMEM); 855 856 *(u_int16_t *)msg->data = sp->Session_ID; 857 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 858 859 return (error); 860 } 861 862 /* 863 * Receive data, and do something with it. 864 * The caller will never free m or meta, so 865 * if we use up this data or abort we must free BOTH of these. 866 */ 867 static int 868 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 869 { 870 node_p node = hook->node; 871 const priv_p privp = node->private; 872 sessp sp = hook->private; 873 const struct pppoe_full_hdr *wh; 874 const struct pppoe_hdr *ph; 875 int error = 0; 876 u_int16_t session; 877 u_int16_t length; 878 u_int8_t code; 879 const struct pppoe_tag *utag = NULL, *tag = NULL; 880 hook_p sendhook; 881 struct { 882 struct pppoe_tag hdr; 883 union uniq data; 884 } __attribute ((packed)) uniqtag; 885 negp neg = NULL; 886 887 AAA 888 if (hook->private == &privp->debug_hook) { 889 /* 890 * Data from the debug hook gets sent without modification 891 * straight to the ethernet. 892 */ 893 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 894 privp->packets_out++; 895 } else if (hook->private == &privp->ethernet_hook) { 896 /* 897 * Incoming data. 898 * Dig out various fields from the packet. 899 * use them to decide where to send it. 900 */ 901 902 privp->packets_in++; 903 if( m->m_len < sizeof(*wh)) { 904 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 905 if (m == NULL) { 906 printf("couldn't m_pullup\n"); 907 LEAVE(ENOBUFS); 908 } 909 } 910 wh = mtod(m, struct pppoe_full_hdr *); 911 ph = &wh->ph; 912 session = ntohs(wh->ph.sid); 913 length = ntohs(wh->ph.length); 914 code = wh->ph.code; 915 switch(wh->eh.ether_type) { 916 case ETHERTYPE_PPPOE_STUPID_DISC: 917 nonstandard = 1; 918 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 919 /* fall through */ 920 case ETHERTYPE_PPPOE_DISC: 921 /* 922 * We need to try to make sure that the tag area 923 * is contiguous, or we could wander off the end 924 * of a buffer and make a mess. 925 * (Linux wouldn't have this problem). 926 */ 927 /*XXX fix this mess */ 928 929 if (m->m_pkthdr.len <= MHLEN) { 930 if( m->m_len < m->m_pkthdr.len) { 931 m = m_pullup(m, m->m_pkthdr.len); 932 if (m == NULL) { 933 printf("couldn't m_pullup\n"); 934 LEAVE(ENOBUFS); 935 } 936 } 937 } 938 if (m->m_len != m->m_pkthdr.len) { 939 /* 940 * It's not all in one piece. 941 * We need to do extra work. 942 */ 943 printf("packet fragmented\n"); 944 LEAVE(EMSGSIZE); 945 } 946 947 switch(code) { 948 case PADI_CODE: 949 /* 950 * We are a server: 951 * Look for a hook with the required service 952 * and send the ENTIRE packet up there. 953 * It should come back to a new hook in 954 * PRIMED state. Look there for further 955 * processing. 956 */ 957 tag = get_tag(ph, PTT_SRV_NAME); 958 if (tag == NULL) { 959 printf("no service tag\n"); 960 LEAVE(ENETUNREACH); 961 } 962 sendhook = pppoe_match_svc(hook->node, 963 tag->tag_data, ntohs(tag->tag_len), 964 NG_MATCH_ANY); 965 if (sendhook) { 966 NG_SEND_DATA(error, sendhook, m, meta); 967 } else { 968 LEAVE(ENETUNREACH); 969 } 970 break; 971 case PADO_CODE: 972 /* 973 * We are a client: 974 * Use the host_uniq tag to find the 975 * hook this is in response to. 976 * Received #2, now send #3 977 * For now simply accept the first we receive. 978 */ 979 utag = get_tag(ph, PTT_HOST_UNIQ); 980 if ((utag == NULL) 981 || (ntohs(utag->tag_len) != sizeof(sp))) { 982 printf("no host unique field\n"); 983 LEAVE(ENETUNREACH); 984 } 985 986 sendhook = pppoe_finduniq(node, utag); 987 if (sendhook == NULL) { 988 printf("no matching session\n"); 989 LEAVE(ENETUNREACH); 990 } 991 992 /* 993 * Check the session is in the right state. 994 * It needs to be in PPPOE_SINIT. 995 */ 996 sp = sendhook->private; 997 if (sp->state != PPPOE_SINIT) { 998 printf("session in wrong state\n"); 999 LEAVE(ENETUNREACH); 1000 } 1001 neg = sp->neg; 1002 untimeout(pppoe_ticker, sendhook, 1003 neg->timeout_handle); 1004 1005 /* 1006 * This is the first time we hear 1007 * from the server, so note it's 1008 * unicast address, replacing the 1009 * broadcast address . 1010 */ 1011 bcopy(wh->eh.ether_shost, 1012 neg->pkt->pkt_header.eh.ether_dhost, 1013 ETHER_ADDR_LEN); 1014 neg->timeout = 0; 1015 neg->pkt->pkt_header.ph.code = PADR_CODE; 1016 init_tags(sp); 1017 insert_tag(sp, utag); /* Host Unique */ 1018 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1019 insert_tag(sp, tag); /* return cookie */ 1020 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1021 insert_tag(sp, tag); /* return it */ 1022 send_acname(sp, tag); 1023 } 1024 insert_tag(sp, &neg->service.hdr); /* Service */ 1025 scan_tags(sp, ph); 1026 make_packet(sp); 1027 sp->state = PPPOE_SREQ; 1028 sendpacket(sp); 1029 break; 1030 case PADR_CODE: 1031 1032 /* 1033 * We are a server: 1034 * Use the ac_cookie tag to find the 1035 * hook this is in response to. 1036 */ 1037 utag = get_tag(ph, PTT_AC_COOKIE); 1038 if ((utag == NULL) 1039 || (ntohs(utag->tag_len) != sizeof(sp))) { 1040 LEAVE(ENETUNREACH); 1041 } 1042 1043 sendhook = pppoe_finduniq(node, utag); 1044 if (sendhook == NULL) { 1045 LEAVE(ENETUNREACH); 1046 } 1047 1048 /* 1049 * Check the session is in the right state. 1050 * It needs to be in PPPOE_SOFFER 1051 * or PPPOE_NEWCONNECTED. If the latter, 1052 * then this is a retry by the client. 1053 * so be nice, and resend. 1054 */ 1055 sp = sendhook->private; 1056 if (sp->state == PPPOE_NEWCONNECTED) { 1057 /* 1058 * Whoa! drop back to resend that 1059 * PADS packet. 1060 * We should still have a copy of it. 1061 */ 1062 sp->state = PPPOE_SOFFER; 1063 } 1064 if (sp->state != PPPOE_SOFFER) { 1065 LEAVE (ENETUNREACH); 1066 break; 1067 } 1068 neg = sp->neg; 1069 untimeout(pppoe_ticker, sendhook, 1070 neg->timeout_handle); 1071 neg->pkt->pkt_header.ph.code = PADS_CODE; 1072 if (sp->Session_ID == 0) 1073 neg->pkt->pkt_header.ph.sid = 1074 htons(sp->Session_ID 1075 = get_new_sid(node)); 1076 send_sessionid(sp); 1077 neg->timeout = 0; 1078 /* 1079 * start working out the tags to respond with. 1080 */ 1081 init_tags(sp); 1082 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1083 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1084 insert_tag(sp, tag);/* return service */ 1085 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1086 insert_tag(sp, tag); /* return it */ 1087 insert_tag(sp, utag); /* ac_cookie */ 1088 scan_tags(sp, ph); 1089 make_packet(sp); 1090 sp->state = PPPOE_NEWCONNECTED; 1091 sendpacket(sp); 1092 /* 1093 * Having sent the last Negotiation header, 1094 * Set up the stored packet header to 1095 * be correct for the actual session. 1096 * But keep the negotialtion stuff 1097 * around in case we need to resend this last 1098 * packet. We'll discard it when we move 1099 * from NEWCONNECTED to CONNECTED 1100 */ 1101 sp->pkt_hdr = neg->pkt->pkt_header; 1102 if (nonstandard) 1103 sp->pkt_hdr.eh.ether_type 1104 = ETHERTYPE_PPPOE_STUPID_SESS; 1105 else 1106 sp->pkt_hdr.eh.ether_type 1107 = ETHERTYPE_PPPOE_SESS; 1108 sp->pkt_hdr.ph.code = 0; 1109 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1110 break; 1111 case PADS_CODE: 1112 /* 1113 * We are a client: 1114 * Use the host_uniq tag to find the 1115 * hook this is in response to. 1116 * take the session ID and store it away. 1117 * Also make sure the pre-made header is 1118 * correct and set us into Session mode. 1119 */ 1120 utag = get_tag(ph, PTT_HOST_UNIQ); 1121 if ((utag == NULL) 1122 || (ntohs(utag->tag_len) != sizeof(sp))) { 1123 LEAVE (ENETUNREACH); 1124 break; 1125 } 1126 sendhook = pppoe_finduniq(node, utag); 1127 if (sendhook == NULL) { 1128 LEAVE(ENETUNREACH); 1129 } 1130 1131 /* 1132 * Check the session is in the right state. 1133 * It needs to be in PPPOE_SREQ. 1134 */ 1135 sp = sendhook->private; 1136 if (sp->state != PPPOE_SREQ) { 1137 LEAVE(ENETUNREACH); 1138 } 1139 neg = sp->neg; 1140 untimeout(pppoe_ticker, sendhook, 1141 neg->timeout_handle); 1142 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1143 sp->Session_ID = ntohs(wh->ph.sid); 1144 send_sessionid(sp); 1145 neg->timeout = 0; 1146 sp->state = PPPOE_CONNECTED; 1147 /* 1148 * Now we have gone to Connected mode, 1149 * Free all resources needed for 1150 * negotiation. 1151 * Keep a copy of the header we will be using. 1152 */ 1153 sp->pkt_hdr = neg->pkt->pkt_header; 1154 if (nonstandard) 1155 sp->pkt_hdr.eh.ether_type 1156 = ETHERTYPE_PPPOE_STUPID_SESS; 1157 else 1158 sp->pkt_hdr.eh.ether_type 1159 = ETHERTYPE_PPPOE_SESS; 1160 sp->pkt_hdr.ph.code = 0; 1161 m_freem(neg->m); 1162 FREE(sp->neg, M_NETGRAPH); 1163 sp->neg = NULL; 1164 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1165 break; 1166 case PADT_CODE: 1167 /* 1168 * Send a 'close' message to the controlling 1169 * process (the one that set us up); 1170 * And then tear everything down. 1171 * 1172 * Find matching peer/session combination. 1173 */ 1174 sendhook = pppoe_findsession(node, wh); 1175 NG_FREE_DATA(m, meta); /* no longer needed */ 1176 if (sendhook == NULL) { 1177 LEAVE(ENETUNREACH); 1178 } 1179 /* send message to creator */ 1180 /* close hook */ 1181 if (sendhook) { 1182 ng_destroy_hook(sendhook); 1183 } 1184 break; 1185 default: 1186 LEAVE(EPFNOSUPPORT); 1187 } 1188 break; 1189 case ETHERTYPE_PPPOE_STUPID_SESS: 1190 case ETHERTYPE_PPPOE_SESS: 1191 /* 1192 * find matching peer/session combination. 1193 */ 1194 sendhook = pppoe_findsession(node, wh); 1195 if (sendhook == NULL) { 1196 LEAVE (ENETUNREACH); 1197 break; 1198 } 1199 sp = sendhook->private; 1200 m_adj(m, sizeof(*wh)); 1201 if (m->m_pkthdr.len < length) { 1202 /* Packet too short, dump it */ 1203 LEAVE(EMSGSIZE); 1204 } 1205 1206 /* Also need to trim excess at the end */ 1207 if (m->m_pkthdr.len > length) { 1208 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1209 } 1210 if ( sp->state != PPPOE_CONNECTED) { 1211 if (sp->state == PPPOE_NEWCONNECTED) { 1212 sp->state = PPPOE_CONNECTED; 1213 /* 1214 * Now we have gone to Connected mode, 1215 * Free all resources needed for 1216 * negotiation. Be paranoid about 1217 * whether there may be a timeout. 1218 */ 1219 m_freem(sp->neg->m); 1220 untimeout(pppoe_ticker, sendhook, 1221 sp->neg->timeout_handle); 1222 FREE(sp->neg, M_NETGRAPH); 1223 sp->neg = NULL; 1224 } else { 1225 LEAVE (ENETUNREACH); 1226 break; 1227 } 1228 } 1229 NG_SEND_DATA( error, sendhook, m, meta); 1230 break; 1231 default: 1232 LEAVE(EPFNOSUPPORT); 1233 } 1234 } else { 1235 /* 1236 * Not ethernet or debug hook.. 1237 * 1238 * The packet has come in on a normal hook. 1239 * We need to find out what kind of hook, 1240 * So we can decide how to handle it. 1241 * Check the hook's state. 1242 */ 1243 sp = hook->private; 1244 switch (sp->state) { 1245 case PPPOE_NEWCONNECTED: 1246 case PPPOE_CONNECTED: { 1247 static const u_char addrctrl[] = { 0xff, 0x03 }; 1248 struct pppoe_full_hdr *wh; 1249 1250 /* 1251 * Remove PPP address and control fields, if any. 1252 * For example, ng_ppp(4) always sends LCP packets 1253 * with address and control fields as required by 1254 * generic PPP. PPPoE is an exception to the rule. 1255 */ 1256 if (m->m_pkthdr.len >= 2) { 1257 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1258 LEAVE(ENOBUFS); 1259 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1260 m_adj(m, 2); 1261 } 1262 /* 1263 * Bang in a pre-made header, and set the length up 1264 * to be correct. Then send it to the ethernet driver. 1265 * But first correct the length. 1266 */ 1267 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1268 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1269 if (m == NULL) { 1270 LEAVE(ENOBUFS); 1271 } 1272 wh = mtod(m, struct pppoe_full_hdr *); 1273 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1274 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1275 privp->packets_out++; 1276 break; 1277 } 1278 case PPPOE_PRIMED: 1279 /* 1280 * A PADI packet is being returned by the application 1281 * that has set up this hook. This indicates that it 1282 * wants us to offer service. 1283 */ 1284 neg = sp->neg; 1285 if (m->m_len < sizeof(*wh)) { 1286 m = m_pullup(m, sizeof(*wh)); 1287 if (m == NULL) { 1288 LEAVE(ENOBUFS); 1289 } 1290 } 1291 wh = mtod(m, struct pppoe_full_hdr *); 1292 ph = &wh->ph; 1293 session = ntohs(wh->ph.sid); 1294 length = ntohs(wh->ph.length); 1295 code = wh->ph.code; 1296 if ( code != PADI_CODE) { 1297 LEAVE(EINVAL); 1298 }; 1299 untimeout(pppoe_ticker, hook, 1300 neg->timeout_handle); 1301 1302 /* 1303 * This is the first time we hear 1304 * from the client, so note it's 1305 * unicast address, replacing the 1306 * broadcast address. 1307 */ 1308 bcopy(wh->eh.ether_shost, 1309 neg->pkt->pkt_header.eh.ether_dhost, 1310 ETHER_ADDR_LEN); 1311 sp->state = PPPOE_SOFFER; 1312 neg->timeout = 0; 1313 neg->pkt->pkt_header.ph.code = PADO_CODE; 1314 1315 /* 1316 * start working out the tags to respond with. 1317 */ 1318 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1319 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1320 uniqtag.data.pointer = sp; 1321 init_tags(sp); 1322 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1323 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1324 insert_tag(sp, tag); /* return service */ 1325 /* 1326 * If we have a NULL service request 1327 * and have an extra service defined in this hook, 1328 * then also add a tag for the extra service. 1329 * XXX this is a hack. eventually we should be able 1330 * to support advertising many services, not just one 1331 */ 1332 if (((tag == NULL) || (tag->tag_len == 0)) 1333 && (neg->service.hdr.tag_len != 0)) { 1334 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1335 } 1336 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1337 insert_tag(sp, tag); /* returned hostunique */ 1338 insert_tag(sp, &uniqtag.hdr); 1339 scan_tags(sp, ph); 1340 make_packet(sp); 1341 sendpacket(sp); 1342 break; 1343 1344 /* 1345 * Packets coming from the hook make no sense 1346 * to sessions in these states. Throw them away. 1347 */ 1348 case PPPOE_SINIT: 1349 case PPPOE_SREQ: 1350 case PPPOE_SOFFER: 1351 case PPPOE_SNONE: 1352 case PPPOE_LISTENING: 1353 case PPPOE_DEAD: 1354 default: 1355 LEAVE(ENETUNREACH); 1356 } 1357 } 1358 quit: 1359 NG_FREE_DATA(m, meta); 1360 return error; 1361 } 1362 1363 /* 1364 * Do local shutdown processing.. 1365 * If we are a persistant device, we might refuse to go away, and 1366 * we'd only remove our links and reset ourself. 1367 */ 1368 static int 1369 ng_pppoe_rmnode(node_p node) 1370 { 1371 const priv_p privdata = node->private; 1372 1373 AAA 1374 node->flags |= NG_INVALID; 1375 ng_cutlinks(node); 1376 ng_unname(node); 1377 node->private = NULL; 1378 ng_unref(privdata->node); 1379 FREE(privdata, M_NETGRAPH); 1380 return (0); 1381 } 1382 1383 /* 1384 * This is called once we've already connected a new hook to the other node. 1385 * It gives us a chance to balk at the last minute. 1386 */ 1387 static int 1388 ng_pppoe_connect(hook_p hook) 1389 { 1390 /* be really amiable and just say "YUP that's OK by me! " */ 1391 return (0); 1392 } 1393 1394 /* 1395 * Hook disconnection 1396 * 1397 * Clean up all dangling links and information about the session/hook. 1398 * For this type, removal of the last link destroys the node 1399 */ 1400 static int 1401 ng_pppoe_disconnect(hook_p hook) 1402 { 1403 node_p node = hook->node; 1404 priv_p privp = node->private; 1405 sessp sp; 1406 int hooks; 1407 1408 AAA 1409 hooks = node->numhooks; /* this one already not counted */ 1410 if (hook->private == &privp->debug_hook) { 1411 privp->debug_hook = NULL; 1412 } else if (hook->private == &privp->ethernet_hook) { 1413 privp->ethernet_hook = NULL; 1414 ng_rmnode(node); 1415 } else { 1416 sp = hook->private; 1417 if (sp->state != PPPOE_SNONE ) { 1418 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1419 } 1420 /* 1421 * According to the spec, if we are connected, 1422 * we should send a DISC packet if we are shutting down 1423 * a session. 1424 */ 1425 if ((privp->ethernet_hook) 1426 && ((sp->state == PPPOE_CONNECTED) 1427 || (sp->state == PPPOE_NEWCONNECTED))) { 1428 struct mbuf *m; 1429 struct pppoe_full_hdr *wh; 1430 struct pppoe_tag *tag; 1431 int msglen = strlen(SIGNOFF); 1432 void *dummy = NULL; 1433 int error = 0; 1434 1435 /* revert the stored header to DISC/PADT mode */ 1436 wh = &sp->pkt_hdr; 1437 wh->ph.code = PADT_CODE; 1438 if (nonstandard) 1439 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1440 else 1441 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1442 1443 /* generate a packet of that type */ 1444 MGETHDR(m, M_DONTWAIT, MT_DATA); 1445 if(m == NULL) 1446 printf("pppoe: Session out of mbufs\n"); 1447 else { 1448 m->m_pkthdr.rcvif = NULL; 1449 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1450 bcopy((caddr_t)wh, mtod(m, caddr_t), 1451 sizeof(*wh)); 1452 /* 1453 * Add a General error message and adjust 1454 * sizes 1455 */ 1456 wh = mtod(m, struct pppoe_full_hdr *); 1457 tag = wh->ph.tag; 1458 tag->tag_type = PTT_GEN_ERR; 1459 tag->tag_len = htons((u_int16_t)msglen); 1460 strncpy(tag->tag_data, SIGNOFF, msglen); 1461 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1462 msglen); 1463 wh->ph.length = htons(sizeof(*tag) + msglen); 1464 NG_SEND_DATA(error, privp->ethernet_hook, m, 1465 dummy); 1466 } 1467 } 1468 /* 1469 * As long as we have somewhere to store the timeout handle, 1470 * we may have a timeout pending.. get rid of it. 1471 */ 1472 if (sp->neg) { 1473 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1474 if (sp->neg->m) 1475 m_freem(sp->neg->m); 1476 FREE(sp->neg, M_NETGRAPH); 1477 } 1478 FREE(sp, M_NETGRAPH); 1479 hook->private = NULL; 1480 /* work out how many session hooks there are */ 1481 /* Node goes away on last session hook removal */ 1482 if (privp->ethernet_hook) hooks -= 1; 1483 if (privp->debug_hook) hooks -= 1; 1484 } 1485 if (node->numhooks == 0) 1486 ng_rmnode(node); 1487 return (0); 1488 } 1489 1490 /* 1491 * timeouts come here. 1492 */ 1493 static void 1494 pppoe_ticker(void *arg) 1495 { 1496 int s = splnet(); 1497 hook_p hook = arg; 1498 sessp sp = hook->private; 1499 negp neg = sp->neg; 1500 int error = 0; 1501 struct mbuf *m0 = NULL; 1502 priv_p privp = hook->node->private; 1503 meta_p dummy = NULL; 1504 1505 AAA 1506 switch(sp->state) { 1507 /* 1508 * resend the last packet, using an exponential backoff. 1509 * After a period of time, stop growing the backoff, 1510 * and either leave it, or revert to the start. 1511 */ 1512 case PPPOE_SINIT: 1513 case PPPOE_SREQ: 1514 /* timeouts on these produce resends */ 1515 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1516 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1517 neg->timeout_handle = timeout(pppoe_ticker, 1518 hook, neg->timeout * hz); 1519 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1520 if (sp->state == PPPOE_SREQ) { 1521 /* revert to SINIT mode */ 1522 pppoe_start(sp); 1523 } else { 1524 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1525 } 1526 } 1527 break; 1528 case PPPOE_PRIMED: 1529 case PPPOE_SOFFER: 1530 /* a timeout on these says "give up" */ 1531 ng_destroy_hook(hook); 1532 break; 1533 default: 1534 /* timeouts have no meaning in other states */ 1535 printf("pppoe: unexpected timeout\n"); 1536 } 1537 splx(s); 1538 } 1539 1540 1541 static void 1542 sendpacket(sessp sp) 1543 { 1544 int error = 0; 1545 struct mbuf *m0 = NULL; 1546 hook_p hook = sp->hook; 1547 negp neg = sp->neg; 1548 priv_p privp = hook->node->private; 1549 meta_p dummy = NULL; 1550 1551 AAA 1552 switch(sp->state) { 1553 case PPPOE_LISTENING: 1554 case PPPOE_DEAD: 1555 case PPPOE_SNONE: 1556 case PPPOE_CONNECTED: 1557 printf("pppoe: sendpacket: unexpected state\n"); 1558 break; 1559 1560 case PPPOE_NEWCONNECTED: 1561 /* send the PADS without a timeout - we're now connected */ 1562 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1563 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1564 break; 1565 1566 case PPPOE_PRIMED: 1567 /* No packet to send, but set up the timeout */ 1568 neg->timeout_handle = timeout(pppoe_ticker, 1569 hook, PPPOE_OFFER_TIMEOUT * hz); 1570 break; 1571 1572 case PPPOE_SOFFER: 1573 /* 1574 * send the offer but if they don't respond 1575 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1576 */ 1577 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1578 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1579 neg->timeout_handle = timeout(pppoe_ticker, 1580 hook, PPPOE_OFFER_TIMEOUT * hz); 1581 break; 1582 1583 case PPPOE_SINIT: 1584 case PPPOE_SREQ: 1585 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1586 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1587 neg->timeout_handle = timeout(pppoe_ticker, hook, 1588 (hz * PPPOE_INITIAL_TIMEOUT)); 1589 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1590 break; 1591 1592 default: 1593 error = EINVAL; 1594 printf("pppoe: timeout: bad state\n"); 1595 } 1596 /* return (error); */ 1597 } 1598 1599 /* 1600 * Parse an incoming packet to see if any tags should be copied to the 1601 * output packet. Don't do any tags that have been handled in the main 1602 * state machine. 1603 */ 1604 static const struct pppoe_tag* 1605 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1606 { 1607 const char *const end = (const char *)next_tag(ph); 1608 const char *ptn; 1609 const struct pppoe_tag *pt = &ph->tag[0]; 1610 /* 1611 * Keep processing tags while a tag header will still fit. 1612 */ 1613 AAA 1614 while((const char*)(pt + 1) <= end) { 1615 /* 1616 * If the tag data would go past the end of the packet, abort. 1617 */ 1618 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1619 if(ptn > end) 1620 return NULL; 1621 1622 switch (pt->tag_type) { 1623 case PTT_RELAY_SID: 1624 insert_tag(sp, pt); 1625 break; 1626 case PTT_EOL: 1627 return NULL; 1628 case PTT_SRV_NAME: 1629 case PTT_AC_NAME: 1630 case PTT_HOST_UNIQ: 1631 case PTT_AC_COOKIE: 1632 case PTT_VENDOR: 1633 case PTT_SRV_ERR: 1634 case PTT_SYS_ERR: 1635 case PTT_GEN_ERR: 1636 break; 1637 } 1638 pt = (const struct pppoe_tag*)ptn; 1639 } 1640 return NULL; 1641 } 1642 1643 static int 1644 pppoe_send_event(sessp sp, enum cmd cmdid) 1645 { 1646 int error; 1647 struct ng_mesg *msg; 1648 struct ngpppoe_sts *sts; 1649 1650 AAA 1651 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1652 sizeof(struct ngpppoe_sts), M_NOWAIT); 1653 if (msg == NULL) 1654 return (ENOMEM); 1655 sts = (struct ngpppoe_sts *)msg->data; 1656 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1657 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1658 return (error); 1659 } 1660