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 1.9 2006/12/22 23:44:57 swildner Exp $ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 #if 0 44 #define AAA kprintf("pppoe: %s\n", __func__ ); 45 #define BBB kprintf("-%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 <sys/syslog.h> 59 #include <sys/thread2.h> 60 #include <net/ethernet.h> 61 62 #include <netgraph/ng_message.h> 63 #include <netgraph/netgraph.h> 64 #include "ng_pppoe.h" 65 66 #define SIGNOFF "session closed" 67 68 /* 69 * This section contains the netgraph method declarations for the 70 * pppoe node. These methods define the netgraph pppoe 'type'. 71 */ 72 73 static ng_constructor_t ng_pppoe_constructor; 74 static ng_rcvmsg_t ng_pppoe_rcvmsg; 75 static ng_shutdown_t ng_pppoe_rmnode; 76 static ng_newhook_t ng_pppoe_newhook; 77 static ng_connect_t ng_pppoe_connect; 78 static ng_rcvdata_t ng_pppoe_rcvdata; 79 static ng_disconnect_t ng_pppoe_disconnect; 80 81 /* Netgraph node type descriptor */ 82 static struct ng_type typestruct = { 83 NG_VERSION, 84 NG_PPPOE_NODE_TYPE, 85 NULL, 86 ng_pppoe_constructor, 87 ng_pppoe_rcvmsg, 88 ng_pppoe_rmnode, 89 ng_pppoe_newhook, 90 NULL, 91 ng_pppoe_connect, 92 ng_pppoe_rcvdata, 93 ng_pppoe_rcvdata, 94 ng_pppoe_disconnect, 95 NULL 96 }; 97 NETGRAPH_INIT(pppoe, &typestruct); 98 99 /* 100 * States for the session state machine. 101 * These have no meaning if there is no hook attached yet. 102 */ 103 enum state { 104 PPPOE_SNONE=0, /* [both] Initial state */ 105 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 106 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 107 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 108 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 109 PPPOE_SREQ, /* [Client] Sent a Request */ 110 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 111 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 112 PPPOE_DEAD /* [Both] */ 113 }; 114 115 #define NUMTAGS 20 /* number of tags we are set up to work with */ 116 117 /* 118 * Information we store for each hook on each node for negotiating the 119 * session. The mbuf and cluster are freed once negotiation has completed. 120 * The whole negotiation block is then discarded. 121 */ 122 123 struct sess_neg { 124 struct mbuf *m; /* holds cluster with last sent packet */ 125 union packet *pkt; /* points within the above cluster */ 126 struct callout timeout_ch; 127 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 128 u_int numtags; 129 const struct pppoe_tag *tags[NUMTAGS]; 130 u_int service_len; 131 u_int ac_name_len; 132 133 struct datatag service; 134 struct datatag ac_name; 135 }; 136 typedef struct sess_neg *negp; 137 138 /* 139 * Session information that is needed after connection. 140 */ 141 struct sess_con { 142 hook_p hook; 143 u_int16_t Session_ID; 144 enum state state; 145 char creator[NG_NODELEN + 1]; /* who to notify */ 146 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 147 negp neg; /* used when negotiating */ 148 /*struct sess_con *hash_next;*/ /* not yet used */ 149 }; 150 typedef struct sess_con *sessp; 151 152 /* 153 * Information we store for each node 154 */ 155 struct PPPOE { 156 node_p node; /* back pointer to node */ 157 hook_p ethernet_hook; 158 hook_p debug_hook; 159 u_int packets_in; /* packets in from ethernet */ 160 u_int packets_out; /* packets out towards ethernet */ 161 u_int32_t flags; 162 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 163 }; 164 typedef struct PPPOE *priv_p; 165 166 struct ether_header eh_prototype = 167 {{0xff,0xff,0xff,0xff,0xff,0xff}, 168 {0x00,0x00,0x00,0x00,0x00,0x00}, 169 ETHERTYPE_PPPOE_DISC}; 170 171 #define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */ 172 #define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */ 173 #define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */ 174 static int pppoe_mode = PPPOE_KEEPSTANDARD; 175 176 static int 177 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 178 { 179 int error; 180 int val; 181 182 val = pppoe_mode; 183 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 184 if (error != 0 || req->newptr == NULL) 185 return (error); 186 switch (val) { 187 case PPPOE_NONSTANDARD: 188 pppoe_mode = PPPOE_NONSTANDARD; 189 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 190 break; 191 case PPPOE_STANDARD: 192 pppoe_mode = PPPOE_STANDARD; 193 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 194 break; 195 case PPPOE_KEEPSTANDARD: 196 pppoe_mode = PPPOE_KEEPSTANDARD; 197 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 198 break; 199 default: 200 return (EINVAL); 201 } 202 return (0); 203 } 204 205 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 206 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype"); 207 208 union uniq { 209 char bytes[sizeof(void *)]; 210 void * pointer; 211 }; 212 213 #define LEAVE(x) do { error = x; goto quit; } while(0) 214 static void pppoe_start(sessp sp); 215 static void sendpacket(sessp sp); 216 static void pppoe_ticker(void *arg); 217 static const struct pppoe_tag *scan_tags(sessp sp, 218 const struct pppoe_hdr* ph); 219 static int pppoe_send_event(sessp sp, enum cmd cmdid); 220 221 /************************************************************************* 222 * Some basic utilities from the Linux version with author's permission.* 223 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 224 ************************************************************************/ 225 226 /* 227 * Generate a new session id 228 * XXX find out the FreeBSD locking scheme. 229 */ 230 static u_int16_t 231 get_new_sid(node_p node) 232 { 233 static int pppoe_sid = 10; 234 sessp sp; 235 hook_p hook; 236 u_int16_t val; 237 priv_p privp = node->private; 238 239 AAA 240 restart: 241 val = pppoe_sid++; 242 /* 243 * Spec says 0xFFFF is reserved. 244 * Also don't use 0x0000 245 */ 246 if (val == 0xffff) { 247 pppoe_sid = 20; 248 goto restart; 249 } 250 251 /* Check it isn't already in use */ 252 LIST_FOREACH(hook, &node->hooks, hooks) { 253 /* don't check special hooks */ 254 if ((hook->private == &privp->debug_hook) 255 || (hook->private == &privp->ethernet_hook)) 256 continue; 257 sp = hook->private; 258 if (sp->Session_ID == val) 259 goto restart; 260 } 261 262 return val; 263 } 264 265 266 /* 267 * Return the location where the next tag can be put 268 */ 269 static __inline const struct pppoe_tag* 270 next_tag(const struct pppoe_hdr* ph) 271 { 272 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 273 + ntohs(ph->length)); 274 } 275 276 /* 277 * Look for a tag of a specific type 278 * Don't trust any length the other end says. 279 * but assume we already sanity checked ph->length. 280 */ 281 static const struct pppoe_tag* 282 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 283 { 284 const char *const end = (const char *)next_tag(ph); 285 const char *ptn; 286 const struct pppoe_tag *pt = &ph->tag[0]; 287 /* 288 * Keep processing tags while a tag header will still fit. 289 */ 290 AAA 291 while((const char*)(pt + 1) <= end) { 292 /* 293 * If the tag data would go past the end of the packet, abort. 294 */ 295 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 296 if(ptn > end) 297 return NULL; 298 299 if(pt->tag_type == idx) 300 return pt; 301 302 pt = (const struct pppoe_tag*)ptn; 303 } 304 return NULL; 305 } 306 307 /************************************************************************** 308 * inlines to initialise or add tags to a session's tag list, 309 **************************************************************************/ 310 /* 311 * Initialise the session's tag list 312 */ 313 static void 314 init_tags(sessp sp) 315 { 316 AAA 317 if(sp->neg == NULL) { 318 kprintf("pppoe: asked to init NULL neg pointer\n"); 319 return; 320 } 321 sp->neg->numtags = 0; 322 } 323 324 static void 325 insert_tag(sessp sp, const struct pppoe_tag *tp) 326 { 327 int i; 328 negp neg; 329 330 AAA 331 if((neg = sp->neg) == NULL) { 332 kprintf("pppoe: asked to use NULL neg pointer\n"); 333 return; 334 } 335 if ((i = neg->numtags++) < NUMTAGS) { 336 neg->tags[i] = tp; 337 } else { 338 kprintf("pppoe: asked to add too many tags to packet\n"); 339 neg->numtags--; 340 } 341 } 342 343 /* 344 * Make up a packet, using the tags filled out for the session. 345 * 346 * Assume that the actual pppoe header and ethernet header 347 * are filled out externally to this routine. 348 * Also assume that neg->wh points to the correct 349 * location at the front of the buffer space. 350 */ 351 static void 352 make_packet(sessp sp) { 353 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 354 const struct pppoe_tag **tag; 355 char *dp; 356 int count; 357 int tlen; 358 u_int16_t length = 0; 359 360 AAA 361 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 362 kprintf("pppoe: make_packet called from wrong state\n"); 363 } 364 dp = (char *)wh->ph.tag; 365 for (count = 0, tag = sp->neg->tags; 366 ((count < sp->neg->numtags) && (count < NUMTAGS)); 367 tag++, count++) { 368 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 369 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 370 kprintf("pppoe: tags too long\n"); 371 sp->neg->numtags = count; 372 break; /* XXX chop off what's too long */ 373 } 374 bcopy(*tag, (char *)dp, tlen); 375 length += tlen; 376 dp += tlen; 377 } 378 wh->ph.length = htons(length); 379 sp->neg->m->m_len = length + sizeof(*wh); 380 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 381 } 382 383 /************************************************************************** 384 * Routine to match a service offered * 385 **************************************************************************/ 386 /* 387 * Find a hook that has a service string that matches that 388 * we are seeking. for now use a simple string. 389 * In the future we may need something like regexp(). 390 * for testing allow a null string to match 1st found and a null service 391 * to match all requests. Also make '*' do the same. 392 */ 393 394 #define NG_MATCH_EXACT 1 395 #define NG_MATCH_ANY 2 396 397 static hook_p 398 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 399 { 400 sessp sp = NULL; 401 negp neg = NULL; 402 priv_p privp = node->private; 403 hook_p allhook = NULL; 404 hook_p hook; 405 406 AAA 407 LIST_FOREACH(hook, &node->hooks, hooks) { 408 409 /* skip any hook that is debug or ethernet */ 410 if ((hook->private == &privp->debug_hook) 411 || (hook->private == &privp->ethernet_hook)) 412 continue; 413 sp = hook->private; 414 415 /* Skip any sessions which are not in LISTEN mode. */ 416 if ( sp->state != PPPOE_LISTENING) 417 continue; 418 419 neg = sp->neg; 420 421 /* Special case for a blank or "*" service name (wildcard) */ 422 if (match == NG_MATCH_ANY && neg->service_len == 1 && 423 neg->service.data[0] == '*') { 424 allhook = hook; 425 continue; 426 } 427 428 /* If the lengths don't match, that aint it. */ 429 if (neg->service_len != svc_len) 430 continue; 431 432 /* An exact match? */ 433 if (svc_len == 0) 434 break; 435 436 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 437 break; 438 } 439 return (hook ? hook : allhook); 440 } 441 /************************************************************************** 442 * Routine to find a particular session that matches an incoming packet * 443 **************************************************************************/ 444 static hook_p 445 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 446 { 447 sessp sp = NULL; 448 hook_p hook = NULL; 449 priv_p privp = node->private; 450 u_int16_t session = ntohs(wh->ph.sid); 451 452 /* 453 * find matching peer/session combination. 454 */ 455 AAA 456 LIST_FOREACH(hook, &node->hooks, hooks) { 457 /* don't check special hooks */ 458 if ((hook->private == &privp->debug_hook) 459 || (hook->private == &privp->ethernet_hook)) { 460 continue; 461 } 462 sp = hook->private; 463 if ( ( (sp->state == PPPOE_CONNECTED) 464 || (sp->state == PPPOE_NEWCONNECTED) ) 465 && (sp->Session_ID == session) 466 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 467 wh->eh.ether_shost, 468 ETHER_ADDR_LEN)) == 0) { 469 break; 470 } 471 } 472 return (hook); 473 } 474 475 static hook_p 476 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 477 { 478 hook_p hook = NULL; 479 priv_p privp = node->private; 480 union uniq uniq; 481 482 AAA 483 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 484 /* cycle through all known hooks */ 485 LIST_FOREACH(hook, &node->hooks, hooks) { 486 /* don't check special hooks */ 487 if ((hook->private == &privp->debug_hook) 488 || (hook->private == &privp->ethernet_hook)) 489 continue; 490 if (uniq.pointer == hook->private) 491 break; 492 } 493 return (hook); 494 } 495 496 /************************************************************************** 497 * start of Netgraph entrypoints * 498 **************************************************************************/ 499 500 /* 501 * Allocate the private data structure and the generic node 502 * and link them together. 503 * 504 * ng_make_node_common() returns with a generic node struct 505 * with a single reference for us.. we transfer it to the 506 * private structure.. when we free the private struct we must 507 * unref the node so it gets freed too. 508 */ 509 static int 510 ng_pppoe_constructor(node_p *nodep) 511 { 512 priv_p privdata; 513 int error; 514 515 AAA 516 /* Initialize private descriptor */ 517 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, M_NOWAIT); 518 if (privdata == NULL) 519 return (ENOMEM); 520 bzero(privdata, sizeof(*privdata)); 521 522 /* Call the 'generic' (ie, superclass) node constructor */ 523 if ((error = ng_make_node_common(&typestruct, nodep))) { 524 FREE(privdata, M_NETGRAPH); 525 return (error); 526 } 527 528 /* Link structs together; this counts as our one reference to *nodep */ 529 (*nodep)->private = privdata; 530 privdata->node = *nodep; 531 return (0); 532 } 533 534 /* 535 * Give our ok for a hook to be added... 536 * point the hook's private info to the hook structure. 537 * 538 * The following hook names are special: 539 * Ethernet: the hook that should be connected to a NIC. 540 * debug: copies of data sent out here (when I write the code). 541 * All other hook names need only be unique. (the framework checks this). 542 */ 543 static int 544 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 545 { 546 const priv_p privp = node->private; 547 sessp sp; 548 549 AAA 550 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 551 privp->ethernet_hook = hook; 552 hook->private = &privp->ethernet_hook; 553 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 554 privp->debug_hook = hook; 555 hook->private = &privp->debug_hook; 556 } else { 557 /* 558 * Any other unique name is OK. 559 * The infrastructure has already checked that it's unique, 560 * so just allocate it and hook it in. 561 */ 562 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT); 563 if (sp == NULL) { 564 return (ENOMEM); 565 } 566 bzero(sp, sizeof(*sp)); 567 568 hook->private = sp; 569 sp->hook = hook; 570 } 571 return(0); 572 } 573 574 /* 575 * Get a netgraph control message. 576 * Check it is one we understand. If needed, send a response. 577 * We sometimes save the address for an async action later. 578 * Always free the message. 579 */ 580 static int 581 ng_pppoe_rcvmsg(node_p node, 582 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 583 { 584 priv_p privp = node->private; 585 struct ngpppoe_init_data *ourmsg = NULL; 586 struct ng_mesg *resp = NULL; 587 int error = 0; 588 hook_p hook = NULL; 589 sessp sp = NULL; 590 negp neg = NULL; 591 592 AAA 593 /* Deal with message according to cookie and command */ 594 switch (msg->header.typecookie) { 595 case NGM_PPPOE_COOKIE: 596 switch (msg->header.cmd) { 597 case NGM_PPPOE_CONNECT: 598 case NGM_PPPOE_LISTEN: 599 case NGM_PPPOE_OFFER: 600 case NGM_PPPOE_SERVICE: 601 ourmsg = (struct ngpppoe_init_data *)msg->data; 602 if (( sizeof(*ourmsg) > msg->header.arglen) 603 || ((sizeof(*ourmsg) + ourmsg->data_len) 604 > msg->header.arglen)) { 605 kprintf("pppoe_rcvmsg: bad arg size"); 606 LEAVE(EMSGSIZE); 607 } 608 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 609 kprintf("pppoe: init data too long (%d)\n", 610 ourmsg->data_len); 611 LEAVE(EMSGSIZE); 612 } 613 /* make sure strcmp will terminate safely */ 614 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 615 616 /* cycle through all known hooks */ 617 LIST_FOREACH(hook, &node->hooks, hooks) { 618 if (hook->name 619 && strcmp(hook->name, ourmsg->hook) == 0) 620 break; 621 } 622 if (hook == NULL) { 623 LEAVE(ENOENT); 624 } 625 if ((hook->private == &privp->debug_hook) 626 || (hook->private == &privp->ethernet_hook)) { 627 LEAVE(EINVAL); 628 } 629 sp = hook->private; 630 631 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 632 /* 633 * Ensure we aren't already listening for this 634 * service. 635 */ 636 if (pppoe_match_svc(node, ourmsg->data, 637 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 638 LEAVE(EEXIST); 639 } 640 } 641 642 /* 643 * PPPOE_SERVICE advertisments are set up 644 * on sessions that are in PRIMED state. 645 */ 646 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 647 break; 648 } 649 if (sp->state |= PPPOE_SNONE) { 650 kprintf("pppoe: Session already active\n"); 651 LEAVE(EISCONN); 652 } 653 654 /* 655 * set up prototype header 656 */ 657 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, M_NOWAIT); 658 659 if (neg == NULL) { 660 kprintf("pppoe: Session out of memory\n"); 661 LEAVE(ENOMEM); 662 } 663 bzero(neg, sizeof(*neg)); 664 MGETHDR(neg->m, MB_DONTWAIT, MT_DATA); 665 if(neg->m == NULL) { 666 kprintf("pppoe: Session out of mbufs\n"); 667 FREE(neg, M_NETGRAPH); 668 LEAVE(ENOBUFS); 669 } 670 neg->m->m_pkthdr.rcvif = NULL; 671 MCLGET(neg->m, MB_DONTWAIT); 672 if ((neg->m->m_flags & M_EXT) == 0) { 673 kprintf("pppoe: Session out of mcls\n"); 674 m_freem(neg->m); 675 FREE(neg, M_NETGRAPH); 676 LEAVE(ENOBUFS); 677 } 678 sp->neg = neg; 679 callout_init(&neg->timeout_ch); 680 neg->m->m_len = sizeof(struct pppoe_full_hdr); 681 neg->pkt = mtod(neg->m, union packet*); 682 neg->pkt->pkt_header.eh = eh_prototype; 683 neg->pkt->pkt_header.ph.ver = 0x1; 684 neg->pkt->pkt_header.ph.type = 0x1; 685 neg->pkt->pkt_header.ph.sid = 0x0000; 686 neg->timeout = 0; 687 688 strncpy(sp->creator, retaddr, NG_NODELEN); 689 sp->creator[NG_NODELEN] = '\0'; 690 } 691 switch (msg->header.cmd) { 692 case NGM_PPPOE_GET_STATUS: 693 { 694 struct ngpppoestat *stats; 695 696 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 697 if (!resp) { 698 LEAVE(ENOMEM); 699 } 700 stats = (struct ngpppoestat *) resp->data; 701 stats->packets_in = privp->packets_in; 702 stats->packets_out = privp->packets_out; 703 break; 704 } 705 case NGM_PPPOE_CONNECT: 706 /* 707 * Check the hook exists and is Uninitialised. 708 * Send a PADI request, and start the timeout logic. 709 * Store the originator of this message so we can send 710 * a success of fail message to them later. 711 * Move the session to SINIT 712 * Set up the session to the correct state and 713 * start it. 714 */ 715 neg->service.hdr.tag_type = PTT_SRV_NAME; 716 neg->service.hdr.tag_len = 717 htons((u_int16_t)ourmsg->data_len); 718 if (ourmsg->data_len) { 719 bcopy(ourmsg->data, 720 neg->service.data, ourmsg->data_len); 721 } 722 neg->service_len = ourmsg->data_len; 723 pppoe_start(sp); 724 break; 725 case NGM_PPPOE_LISTEN: 726 /* 727 * Check the hook exists and is Uninitialised. 728 * Install the service matching string. 729 * Store the originator of this message so we can send 730 * a success of fail message to them later. 731 * Move the hook to 'LISTENING' 732 */ 733 neg->service.hdr.tag_type = PTT_SRV_NAME; 734 neg->service.hdr.tag_len = 735 htons((u_int16_t)ourmsg->data_len); 736 737 if (ourmsg->data_len) { 738 bcopy(ourmsg->data, 739 neg->service.data, ourmsg->data_len); 740 } 741 neg->service_len = ourmsg->data_len; 742 neg->pkt->pkt_header.ph.code = PADT_CODE; 743 /* 744 * wait for PADI packet coming from ethernet 745 */ 746 sp->state = PPPOE_LISTENING; 747 break; 748 case NGM_PPPOE_OFFER: 749 /* 750 * Check the hook exists and is Uninitialised. 751 * Store the originator of this message so we can send 752 * a success of fail message to them later. 753 * Store the AC-Name given and go to PRIMED. 754 */ 755 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 756 neg->ac_name.hdr.tag_len = 757 htons((u_int16_t)ourmsg->data_len); 758 if (ourmsg->data_len) { 759 bcopy(ourmsg->data, 760 neg->ac_name.data, ourmsg->data_len); 761 } 762 neg->ac_name_len = ourmsg->data_len; 763 neg->pkt->pkt_header.ph.code = PADO_CODE; 764 /* 765 * Wait for PADI packet coming from hook 766 */ 767 sp->state = PPPOE_PRIMED; 768 break; 769 case NGM_PPPOE_SERVICE: 770 /* 771 * Check the session is primed. 772 * for now just allow ONE service to be advertised. 773 * If you do it twice you just overwrite. 774 */ 775 if (sp->state != PPPOE_PRIMED) { 776 kprintf("pppoe: Session not primed\n"); 777 LEAVE(EISCONN); 778 } 779 neg = sp->neg; 780 neg->service.hdr.tag_type = PTT_SRV_NAME; 781 neg->service.hdr.tag_len = 782 htons((u_int16_t)ourmsg->data_len); 783 784 if (ourmsg->data_len) 785 bcopy(ourmsg->data, neg->service.data, 786 ourmsg->data_len); 787 neg->service_len = ourmsg->data_len; 788 break; 789 default: 790 LEAVE(EINVAL); 791 } 792 break; 793 default: 794 LEAVE(EINVAL); 795 } 796 797 /* Take care of synchronous response, if any */ 798 if (rptr) 799 *rptr = resp; 800 else if (resp) 801 FREE(resp, M_NETGRAPH); 802 803 /* Free the message and return */ 804 quit: 805 FREE(msg, M_NETGRAPH); 806 return(error); 807 } 808 809 /* 810 * Start a client into the first state. A separate function because 811 * it can be needed if the negotiation times out. 812 */ 813 static void 814 pppoe_start(sessp sp) 815 { 816 struct { 817 struct pppoe_tag hdr; 818 union uniq data; 819 } __attribute ((packed)) uniqtag; 820 821 /* 822 * kick the state machine into starting up 823 */ 824 AAA 825 sp->state = PPPOE_SINIT; 826 /* reset the packet header to broadcast */ 827 sp->neg->pkt->pkt_header.eh = eh_prototype; 828 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 829 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 830 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 831 uniqtag.data.pointer = sp; 832 init_tags(sp); 833 insert_tag(sp, &uniqtag.hdr); 834 insert_tag(sp, &sp->neg->service.hdr); 835 make_packet(sp); 836 sendpacket(sp); 837 } 838 839 static int 840 send_acname(sessp sp, const struct pppoe_tag *tag) 841 { 842 int error, tlen; 843 struct ng_mesg *msg; 844 struct ngpppoe_sts *sts; 845 846 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 847 sizeof(struct ngpppoe_sts), M_NOWAIT); 848 if (msg == NULL) 849 return (ENOMEM); 850 851 sts = (struct ngpppoe_sts *)msg->data; 852 tlen = min(NG_HOOKLEN, ntohs(tag->tag_len)); 853 strncpy(sts->hook, tag->tag_data, tlen); 854 sts->hook[tlen] = '\0'; 855 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 856 857 return (error); 858 } 859 860 static int 861 send_sessionid(sessp sp) 862 { 863 int error; 864 struct ng_mesg *msg; 865 866 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 867 sizeof(u_int16_t), M_NOWAIT); 868 if (msg == NULL) 869 return (ENOMEM); 870 871 *(u_int16_t *)msg->data = sp->Session_ID; 872 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 873 874 return (error); 875 } 876 877 /* 878 * Receive data, and do something with it. 879 * The caller will never free m or meta, so 880 * if we use up this data or abort we must free BOTH of these. 881 */ 882 static int 883 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 884 { 885 node_p node = hook->node; 886 const priv_p privp = node->private; 887 sessp sp = hook->private; 888 const struct pppoe_full_hdr *wh; 889 const struct pppoe_hdr *ph; 890 int error = 0; 891 u_int16_t session; 892 u_int16_t length; 893 u_int8_t code; 894 const struct pppoe_tag *utag = NULL, *tag = NULL; 895 hook_p sendhook; 896 struct { 897 struct pppoe_tag hdr; 898 union uniq data; 899 } __attribute ((packed)) uniqtag; 900 negp neg = NULL; 901 902 AAA 903 if (hook->private == &privp->debug_hook) { 904 /* 905 * Data from the debug hook gets sent without modification 906 * straight to the ethernet. 907 */ 908 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 909 privp->packets_out++; 910 } else if (hook->private == &privp->ethernet_hook) { 911 /* 912 * Incoming data. 913 * Dig out various fields from the packet. 914 * use them to decide where to send it. 915 */ 916 917 privp->packets_in++; 918 if( m->m_len < sizeof(*wh)) { 919 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 920 if (m == NULL) { 921 kprintf("couldn't m_pullup\n"); 922 LEAVE(ENOBUFS); 923 } 924 } 925 wh = mtod(m, struct pppoe_full_hdr *); 926 ph = &wh->ph; 927 session = ntohs(wh->ph.sid); 928 length = ntohs(wh->ph.length); 929 code = wh->ph.code; 930 switch(wh->eh.ether_type) { 931 case ETHERTYPE_PPPOE_STUPID_DISC: 932 if (pppoe_mode == PPPOE_STANDARD) { 933 pppoe_mode = PPPOE_NONSTANDARD; 934 eh_prototype.ether_type = 935 ETHERTYPE_PPPOE_STUPID_DISC; 936 log(LOG_NOTICE, 937 "Switched to nonstandard PPPoE mode due to " 938 "packet from %*D\n", 939 ETHER_ADDR_LEN, 940 wh->eh.ether_shost, ":"); 941 } else if (pppoe_mode == PPPOE_KEEPSTANDARD) 942 log(LOG_NOTICE, 943 "Ignored nonstandard PPPoE packet " 944 "from %*D\n", 945 ETHER_ADDR_LEN, 946 wh->eh.ether_shost, ":"); 947 /* fall through */ 948 case ETHERTYPE_PPPOE_DISC: 949 /* 950 * We need to try to make sure that the tag area 951 * is contiguous, or we could wander off the end 952 * of a buffer and make a mess. 953 * (Linux wouldn't have this problem). 954 */ 955 /*XXX fix this mess */ 956 957 if (m->m_pkthdr.len <= MHLEN) { 958 if( m->m_len < m->m_pkthdr.len) { 959 m = m_pullup(m, m->m_pkthdr.len); 960 if (m == NULL) { 961 kprintf("couldn't m_pullup\n"); 962 LEAVE(ENOBUFS); 963 } 964 } 965 } 966 if (m->m_len != m->m_pkthdr.len) { 967 /* 968 * It's not all in one piece. 969 * We need to do extra work. 970 */ 971 kprintf("packet fragmented\n"); 972 LEAVE(EMSGSIZE); 973 } 974 975 switch(code) { 976 case PADI_CODE: 977 /* 978 * We are a server: 979 * Look for a hook with the required service 980 * and send the ENTIRE packet up there. 981 * It should come back to a new hook in 982 * PRIMED state. Look there for further 983 * processing. 984 */ 985 tag = get_tag(ph, PTT_SRV_NAME); 986 if (tag == NULL) { 987 kprintf("no service tag\n"); 988 LEAVE(ENETUNREACH); 989 } 990 sendhook = pppoe_match_svc(hook->node, 991 tag->tag_data, ntohs(tag->tag_len), 992 NG_MATCH_ANY); 993 if (sendhook) { 994 NG_SEND_DATA(error, sendhook, m, meta); 995 } else { 996 LEAVE(ENETUNREACH); 997 } 998 break; 999 case PADO_CODE: 1000 /* 1001 * We are a client: 1002 * Use the host_uniq tag to find the 1003 * hook this is in response to. 1004 * Received #2, now send #3 1005 * For now simply accept the first we receive. 1006 */ 1007 utag = get_tag(ph, PTT_HOST_UNIQ); 1008 if ((utag == NULL) 1009 || (ntohs(utag->tag_len) != sizeof(sp))) { 1010 kprintf("no host unique field\n"); 1011 LEAVE(ENETUNREACH); 1012 } 1013 1014 sendhook = pppoe_finduniq(node, utag); 1015 if (sendhook == NULL) { 1016 kprintf("no matching session\n"); 1017 LEAVE(ENETUNREACH); 1018 } 1019 1020 /* 1021 * Check the session is in the right state. 1022 * It needs to be in PPPOE_SINIT. 1023 */ 1024 sp = sendhook->private; 1025 if (sp->state != PPPOE_SINIT) { 1026 kprintf("session in wrong state\n"); 1027 LEAVE(ENETUNREACH); 1028 } 1029 neg = sp->neg; 1030 callout_stop(&neg->timeout_ch); 1031 1032 /* 1033 * This is the first time we hear 1034 * from the server, so note it's 1035 * unicast address, replacing the 1036 * broadcast address . 1037 */ 1038 bcopy(wh->eh.ether_shost, 1039 neg->pkt->pkt_header.eh.ether_dhost, 1040 ETHER_ADDR_LEN); 1041 neg->timeout = 0; 1042 neg->pkt->pkt_header.ph.code = PADR_CODE; 1043 init_tags(sp); 1044 insert_tag(sp, utag); /* Host Unique */ 1045 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1046 insert_tag(sp, tag); /* return cookie */ 1047 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1048 insert_tag(sp, tag); /* return it */ 1049 send_acname(sp, tag); 1050 } 1051 insert_tag(sp, &neg->service.hdr); /* Service */ 1052 scan_tags(sp, ph); 1053 make_packet(sp); 1054 sp->state = PPPOE_SREQ; 1055 sendpacket(sp); 1056 break; 1057 case PADR_CODE: 1058 1059 /* 1060 * We are a server: 1061 * Use the ac_cookie tag to find the 1062 * hook this is in response to. 1063 */ 1064 utag = get_tag(ph, PTT_AC_COOKIE); 1065 if ((utag == NULL) 1066 || (ntohs(utag->tag_len) != sizeof(sp))) { 1067 LEAVE(ENETUNREACH); 1068 } 1069 1070 sendhook = pppoe_finduniq(node, utag); 1071 if (sendhook == NULL) { 1072 LEAVE(ENETUNREACH); 1073 } 1074 1075 /* 1076 * Check the session is in the right state. 1077 * It needs to be in PPPOE_SOFFER 1078 * or PPPOE_NEWCONNECTED. If the latter, 1079 * then this is a retry by the client. 1080 * so be nice, and resend. 1081 */ 1082 sp = sendhook->private; 1083 if (sp->state == PPPOE_NEWCONNECTED) { 1084 /* 1085 * Whoa! drop back to resend that 1086 * PADS packet. 1087 * We should still have a copy of it. 1088 */ 1089 sp->state = PPPOE_SOFFER; 1090 } 1091 if (sp->state != PPPOE_SOFFER) { 1092 LEAVE (ENETUNREACH); 1093 break; 1094 } 1095 neg = sp->neg; 1096 callout_stop(&neg->timeout_ch); 1097 neg->pkt->pkt_header.ph.code = PADS_CODE; 1098 if (sp->Session_ID == 0) 1099 neg->pkt->pkt_header.ph.sid = 1100 htons(sp->Session_ID 1101 = get_new_sid(node)); 1102 send_sessionid(sp); 1103 neg->timeout = 0; 1104 /* 1105 * start working out the tags to respond with. 1106 */ 1107 init_tags(sp); 1108 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1109 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1110 insert_tag(sp, tag);/* return service */ 1111 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1112 insert_tag(sp, tag); /* return it */ 1113 insert_tag(sp, utag); /* ac_cookie */ 1114 scan_tags(sp, ph); 1115 make_packet(sp); 1116 sp->state = PPPOE_NEWCONNECTED; 1117 sendpacket(sp); 1118 /* 1119 * Having sent the last Negotiation header, 1120 * Set up the stored packet header to 1121 * be correct for the actual session. 1122 * But keep the negotialtion stuff 1123 * around in case we need to resend this last 1124 * packet. We'll discard it when we move 1125 * from NEWCONNECTED to CONNECTED 1126 */ 1127 sp->pkt_hdr = neg->pkt->pkt_header; 1128 if (pppoe_mode == PPPOE_NONSTANDARD) 1129 sp->pkt_hdr.eh.ether_type 1130 = ETHERTYPE_PPPOE_STUPID_SESS; 1131 else 1132 sp->pkt_hdr.eh.ether_type 1133 = ETHERTYPE_PPPOE_SESS; 1134 sp->pkt_hdr.ph.code = 0; 1135 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1136 break; 1137 case PADS_CODE: 1138 /* 1139 * We are a client: 1140 * Use the host_uniq tag to find the 1141 * hook this is in response to. 1142 * take the session ID and store it away. 1143 * Also make sure the pre-made header is 1144 * correct and set us into Session mode. 1145 */ 1146 utag = get_tag(ph, PTT_HOST_UNIQ); 1147 if ((utag == NULL) 1148 || (ntohs(utag->tag_len) != sizeof(sp))) { 1149 LEAVE (ENETUNREACH); 1150 break; 1151 } 1152 sendhook = pppoe_finduniq(node, utag); 1153 if (sendhook == NULL) { 1154 LEAVE(ENETUNREACH); 1155 } 1156 1157 /* 1158 * Check the session is in the right state. 1159 * It needs to be in PPPOE_SREQ. 1160 */ 1161 sp = sendhook->private; 1162 if (sp->state != PPPOE_SREQ) { 1163 LEAVE(ENETUNREACH); 1164 } 1165 neg = sp->neg; 1166 callout_stop(&neg->timeout_ch); 1167 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1168 sp->Session_ID = ntohs(wh->ph.sid); 1169 send_sessionid(sp); 1170 neg->timeout = 0; 1171 sp->state = PPPOE_CONNECTED; 1172 /* 1173 * Now we have gone to Connected mode, 1174 * Free all resources needed for 1175 * negotiation. 1176 * Keep a copy of the header we will be using. 1177 */ 1178 sp->pkt_hdr = neg->pkt->pkt_header; 1179 if (pppoe_mode == PPPOE_NONSTANDARD) 1180 sp->pkt_hdr.eh.ether_type 1181 = ETHERTYPE_PPPOE_STUPID_SESS; 1182 else 1183 sp->pkt_hdr.eh.ether_type 1184 = ETHERTYPE_PPPOE_SESS; 1185 sp->pkt_hdr.ph.code = 0; 1186 m_freem(neg->m); 1187 FREE(sp->neg, M_NETGRAPH); 1188 sp->neg = NULL; 1189 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1190 break; 1191 case PADT_CODE: 1192 /* 1193 * Send a 'close' message to the controlling 1194 * process (the one that set us up); 1195 * And then tear everything down. 1196 * 1197 * Find matching peer/session combination. 1198 */ 1199 sendhook = pppoe_findsession(node, wh); 1200 NG_FREE_DATA(m, meta); /* no longer needed */ 1201 if (sendhook == NULL) { 1202 LEAVE(ENETUNREACH); 1203 } 1204 /* send message to creator */ 1205 /* close hook */ 1206 if (sendhook) { 1207 ng_destroy_hook(sendhook); 1208 } 1209 break; 1210 default: 1211 LEAVE(EPFNOSUPPORT); 1212 } 1213 break; 1214 case ETHERTYPE_PPPOE_STUPID_SESS: 1215 case ETHERTYPE_PPPOE_SESS: 1216 /* 1217 * find matching peer/session combination. 1218 */ 1219 sendhook = pppoe_findsession(node, wh); 1220 if (sendhook == NULL) { 1221 LEAVE (ENETUNREACH); 1222 break; 1223 } 1224 sp = sendhook->private; 1225 m_adj(m, sizeof(*wh)); 1226 if (m->m_pkthdr.len < length) { 1227 /* Packet too short, dump it */ 1228 LEAVE(EMSGSIZE); 1229 } 1230 1231 /* Also need to trim excess at the end */ 1232 if (m->m_pkthdr.len > length) { 1233 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1234 } 1235 if ( sp->state != PPPOE_CONNECTED) { 1236 if (sp->state == PPPOE_NEWCONNECTED) { 1237 sp->state = PPPOE_CONNECTED; 1238 /* 1239 * Now we have gone to Connected mode, 1240 * Free all resources needed for 1241 * negotiation. Be paranoid about 1242 * whether there may be a timeout. 1243 */ 1244 m_freem(sp->neg->m); 1245 callout_stop(&sp->neg->timeout_ch); 1246 FREE(sp->neg, M_NETGRAPH); 1247 sp->neg = NULL; 1248 } else { 1249 LEAVE (ENETUNREACH); 1250 break; 1251 } 1252 } 1253 NG_SEND_DATA( error, sendhook, m, meta); 1254 break; 1255 default: 1256 LEAVE(EPFNOSUPPORT); 1257 } 1258 } else { 1259 /* 1260 * Not ethernet or debug hook.. 1261 * 1262 * The packet has come in on a normal hook. 1263 * We need to find out what kind of hook, 1264 * So we can decide how to handle it. 1265 * Check the hook's state. 1266 */ 1267 sp = hook->private; 1268 switch (sp->state) { 1269 case PPPOE_NEWCONNECTED: 1270 case PPPOE_CONNECTED: { 1271 static const u_char addrctrl[] = { 0xff, 0x03 }; 1272 struct pppoe_full_hdr *wh; 1273 1274 /* 1275 * Remove PPP address and control fields, if any. 1276 * For example, ng_ppp(4) always sends LCP packets 1277 * with address and control fields as required by 1278 * generic PPP. PPPoE is an exception to the rule. 1279 */ 1280 if (m->m_pkthdr.len >= 2) { 1281 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1282 LEAVE(ENOBUFS); 1283 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1284 m_adj(m, 2); 1285 } 1286 /* 1287 * Bang in a pre-made header, and set the length up 1288 * to be correct. Then send it to the ethernet driver. 1289 * But first correct the length. 1290 */ 1291 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1292 M_PREPEND(m, sizeof(*wh), MB_DONTWAIT); 1293 if (m == NULL) { 1294 LEAVE(ENOBUFS); 1295 } 1296 wh = mtod(m, struct pppoe_full_hdr *); 1297 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1298 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1299 privp->packets_out++; 1300 break; 1301 } 1302 case PPPOE_PRIMED: 1303 /* 1304 * A PADI packet is being returned by the application 1305 * that has set up this hook. This indicates that it 1306 * wants us to offer service. 1307 */ 1308 neg = sp->neg; 1309 if (m->m_len < sizeof(*wh)) { 1310 m = m_pullup(m, sizeof(*wh)); 1311 if (m == NULL) { 1312 LEAVE(ENOBUFS); 1313 } 1314 } 1315 wh = mtod(m, struct pppoe_full_hdr *); 1316 ph = &wh->ph; 1317 session = ntohs(wh->ph.sid); 1318 length = ntohs(wh->ph.length); 1319 code = wh->ph.code; 1320 if ( code != PADI_CODE) { 1321 LEAVE(EINVAL); 1322 }; 1323 callout_stop(&neg->timeout_ch); 1324 1325 /* 1326 * This is the first time we hear 1327 * from the client, so note it's 1328 * unicast address, replacing the 1329 * broadcast address. 1330 */ 1331 bcopy(wh->eh.ether_shost, 1332 neg->pkt->pkt_header.eh.ether_dhost, 1333 ETHER_ADDR_LEN); 1334 sp->state = PPPOE_SOFFER; 1335 neg->timeout = 0; 1336 neg->pkt->pkt_header.ph.code = PADO_CODE; 1337 1338 /* 1339 * start working out the tags to respond with. 1340 */ 1341 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1342 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1343 uniqtag.data.pointer = sp; 1344 init_tags(sp); 1345 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1346 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1347 insert_tag(sp, tag); /* return service */ 1348 /* 1349 * If we have a NULL service request 1350 * and have an extra service defined in this hook, 1351 * then also add a tag for the extra service. 1352 * XXX this is a hack. eventually we should be able 1353 * to support advertising many services, not just one 1354 */ 1355 if (((tag == NULL) || (tag->tag_len == 0)) 1356 && (neg->service.hdr.tag_len != 0)) { 1357 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1358 } 1359 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1360 insert_tag(sp, tag); /* returned hostunique */ 1361 insert_tag(sp, &uniqtag.hdr); 1362 scan_tags(sp, ph); 1363 make_packet(sp); 1364 sendpacket(sp); 1365 break; 1366 1367 /* 1368 * Packets coming from the hook make no sense 1369 * to sessions in these states. Throw them away. 1370 */ 1371 case PPPOE_SINIT: 1372 case PPPOE_SREQ: 1373 case PPPOE_SOFFER: 1374 case PPPOE_SNONE: 1375 case PPPOE_LISTENING: 1376 case PPPOE_DEAD: 1377 default: 1378 LEAVE(ENETUNREACH); 1379 } 1380 } 1381 quit: 1382 NG_FREE_DATA(m, meta); 1383 return error; 1384 } 1385 1386 /* 1387 * Do local shutdown processing.. 1388 * If we are a persistant device, we might refuse to go away, and 1389 * we'd only remove our links and reset ourself. 1390 */ 1391 static int 1392 ng_pppoe_rmnode(node_p node) 1393 { 1394 const priv_p privdata = node->private; 1395 1396 AAA 1397 node->flags |= NG_INVALID; 1398 ng_cutlinks(node); 1399 ng_unname(node); 1400 node->private = NULL; 1401 ng_unref(privdata->node); 1402 FREE(privdata, M_NETGRAPH); 1403 return (0); 1404 } 1405 1406 /* 1407 * This is called once we've already connected a new hook to the other node. 1408 * It gives us a chance to balk at the last minute. 1409 */ 1410 static int 1411 ng_pppoe_connect(hook_p hook) 1412 { 1413 /* be really amiable and just say "YUP that's OK by me! " */ 1414 return (0); 1415 } 1416 1417 /* 1418 * Hook disconnection 1419 * 1420 * Clean up all dangling links and information about the session/hook. 1421 * For this type, removal of the last link destroys the node 1422 */ 1423 static int 1424 ng_pppoe_disconnect(hook_p hook) 1425 { 1426 node_p node = hook->node; 1427 priv_p privp = node->private; 1428 sessp sp; 1429 int hooks; 1430 1431 AAA 1432 hooks = node->numhooks; /* this one already not counted */ 1433 if (hook->private == &privp->debug_hook) { 1434 privp->debug_hook = NULL; 1435 } else if (hook->private == &privp->ethernet_hook) { 1436 privp->ethernet_hook = NULL; 1437 ng_rmnode(node); 1438 } else { 1439 sp = hook->private; 1440 if (sp->state != PPPOE_SNONE ) { 1441 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1442 } 1443 /* 1444 * According to the spec, if we are connected, 1445 * we should send a DISC packet if we are shutting down 1446 * a session. 1447 */ 1448 if ((privp->ethernet_hook) 1449 && ((sp->state == PPPOE_CONNECTED) 1450 || (sp->state == PPPOE_NEWCONNECTED))) { 1451 struct mbuf *m; 1452 struct pppoe_full_hdr *wh; 1453 struct pppoe_tag *tag; 1454 int msglen = strlen(SIGNOFF); 1455 void *dummy = NULL; 1456 int error = 0; 1457 1458 /* revert the stored header to DISC/PADT mode */ 1459 wh = &sp->pkt_hdr; 1460 wh->ph.code = PADT_CODE; 1461 if (pppoe_mode == PPPOE_NONSTANDARD) 1462 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1463 else 1464 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1465 1466 /* generate a packet of that type */ 1467 MGETHDR(m, MB_DONTWAIT, MT_DATA); 1468 if(m == NULL) 1469 kprintf("pppoe: Session out of mbufs\n"); 1470 else { 1471 m->m_pkthdr.rcvif = NULL; 1472 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1473 bcopy((caddr_t)wh, mtod(m, caddr_t), 1474 sizeof(*wh)); 1475 /* 1476 * Add a General error message and adjust 1477 * sizes 1478 */ 1479 wh = mtod(m, struct pppoe_full_hdr *); 1480 tag = wh->ph.tag; 1481 tag->tag_type = PTT_GEN_ERR; 1482 tag->tag_len = htons((u_int16_t)msglen); 1483 strncpy(tag->tag_data, SIGNOFF, msglen); 1484 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1485 msglen); 1486 wh->ph.length = htons(sizeof(*tag) + msglen); 1487 NG_SEND_DATA(error, privp->ethernet_hook, m, 1488 dummy); 1489 } 1490 } 1491 /* 1492 * As long as we have somewhere to store the timeout handle, 1493 * we may have a timeout pending.. get rid of it. 1494 */ 1495 if (sp->neg) { 1496 callout_stop(&sp->neg->timeout_ch); 1497 if (sp->neg->m) 1498 m_freem(sp->neg->m); 1499 FREE(sp->neg, M_NETGRAPH); 1500 } 1501 FREE(sp, M_NETGRAPH); 1502 hook->private = NULL; 1503 /* work out how many session hooks there are */ 1504 /* Node goes away on last session hook removal */ 1505 if (privp->ethernet_hook) hooks -= 1; 1506 if (privp->debug_hook) hooks -= 1; 1507 } 1508 if (node->numhooks == 0) 1509 ng_rmnode(node); 1510 return (0); 1511 } 1512 1513 /* 1514 * timeouts come here. 1515 */ 1516 static void 1517 pppoe_ticker(void *arg) 1518 { 1519 hook_p hook = arg; 1520 sessp sp = hook->private; 1521 negp neg = sp->neg; 1522 int error = 0; 1523 struct mbuf *m0 = NULL; 1524 priv_p privp = hook->node->private; 1525 meta_p dummy = NULL; 1526 1527 crit_enter(); 1528 AAA 1529 switch(sp->state) { 1530 /* 1531 * resend the last packet, using an exponential backoff. 1532 * After a period of time, stop growing the backoff, 1533 * and either leave it, or revert to the start. 1534 */ 1535 case PPPOE_SINIT: 1536 case PPPOE_SREQ: 1537 /* timeouts on these produce resends */ 1538 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1539 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1540 callout_reset(&neg->timeout_ch, neg->timeout * hz, 1541 pppoe_ticker, hook); 1542 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1543 if (sp->state == PPPOE_SREQ) { 1544 /* revert to SINIT mode */ 1545 pppoe_start(sp); 1546 } else { 1547 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1548 } 1549 } 1550 break; 1551 case PPPOE_PRIMED: 1552 case PPPOE_SOFFER: 1553 /* a timeout on these says "give up" */ 1554 ng_destroy_hook(hook); 1555 break; 1556 default: 1557 /* timeouts have no meaning in other states */ 1558 kprintf("pppoe: unexpected timeout\n"); 1559 } 1560 crit_exit(); 1561 } 1562 1563 1564 static void 1565 sendpacket(sessp sp) 1566 { 1567 int error = 0; 1568 struct mbuf *m0 = NULL; 1569 hook_p hook = sp->hook; 1570 negp neg = sp->neg; 1571 priv_p privp = hook->node->private; 1572 meta_p dummy = NULL; 1573 1574 AAA 1575 switch(sp->state) { 1576 case PPPOE_LISTENING: 1577 case PPPOE_DEAD: 1578 case PPPOE_SNONE: 1579 case PPPOE_CONNECTED: 1580 kprintf("pppoe: sendpacket: unexpected state\n"); 1581 break; 1582 1583 case PPPOE_NEWCONNECTED: 1584 /* send the PADS without a timeout - we're now connected */ 1585 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1586 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1587 break; 1588 1589 case PPPOE_PRIMED: 1590 /* No packet to send, but set up the timeout */ 1591 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1592 pppoe_ticker, hook); 1593 break; 1594 1595 case PPPOE_SOFFER: 1596 /* 1597 * send the offer but if they don't respond 1598 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1599 */ 1600 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1601 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1602 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1603 pppoe_ticker, hook); 1604 break; 1605 1606 case PPPOE_SINIT: 1607 case PPPOE_SREQ: 1608 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1609 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1610 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz, 1611 pppoe_ticker, hook); 1612 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1613 break; 1614 1615 default: 1616 error = EINVAL; 1617 kprintf("pppoe: timeout: bad state\n"); 1618 } 1619 /* return (error); */ 1620 } 1621 1622 /* 1623 * Parse an incoming packet to see if any tags should be copied to the 1624 * output packet. Don't do any tags that have been handled in the main 1625 * state machine. 1626 */ 1627 static const struct pppoe_tag* 1628 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1629 { 1630 const char *const end = (const char *)next_tag(ph); 1631 const char *ptn; 1632 const struct pppoe_tag *pt = &ph->tag[0]; 1633 /* 1634 * Keep processing tags while a tag header will still fit. 1635 */ 1636 AAA 1637 while((const char*)(pt + 1) <= end) { 1638 /* 1639 * If the tag data would go past the end of the packet, abort. 1640 */ 1641 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1642 if(ptn > end) 1643 return NULL; 1644 1645 switch (pt->tag_type) { 1646 case PTT_RELAY_SID: 1647 insert_tag(sp, pt); 1648 break; 1649 case PTT_EOL: 1650 return NULL; 1651 case PTT_SRV_NAME: 1652 case PTT_AC_NAME: 1653 case PTT_HOST_UNIQ: 1654 case PTT_AC_COOKIE: 1655 case PTT_VENDOR: 1656 case PTT_SRV_ERR: 1657 case PTT_SYS_ERR: 1658 case PTT_GEN_ERR: 1659 break; 1660 } 1661 pt = (const struct pppoe_tag*)ptn; 1662 } 1663 return NULL; 1664 } 1665 1666 static int 1667 pppoe_send_event(sessp sp, enum cmd cmdid) 1668 { 1669 int error; 1670 struct ng_mesg *msg; 1671 struct ngpppoe_sts *sts; 1672 1673 AAA 1674 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1675 sizeof(struct ngpppoe_sts), M_NOWAIT); 1676 if (msg == NULL) 1677 return (ENOMEM); 1678 sts = (struct ngpppoe_sts *)msg->data; 1679 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1680 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1681 return (error); 1682 } 1683