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 1.11 2008/01/05 14:02:39 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_NODESIZ]; /* 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 | M_ZERO); 518 if (privdata == NULL) 519 return (ENOMEM); 520 521 /* Call the 'generic' (ie, superclass) node constructor */ 522 if ((error = ng_make_node_common(&typestruct, nodep))) { 523 FREE(privdata, M_NETGRAPH); 524 return (error); 525 } 526 527 /* Link structs together; this counts as our one reference to *nodep */ 528 (*nodep)->private = privdata; 529 privdata->node = *nodep; 530 return (0); 531 } 532 533 /* 534 * Give our ok for a hook to be added... 535 * point the hook's private info to the hook structure. 536 * 537 * The following hook names are special: 538 * Ethernet: the hook that should be connected to a NIC. 539 * debug: copies of data sent out here (when I write the code). 540 * All other hook names need only be unique. (the framework checks this). 541 */ 542 static int 543 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 544 { 545 const priv_p privp = node->private; 546 sessp sp; 547 548 AAA 549 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 550 privp->ethernet_hook = hook; 551 hook->private = &privp->ethernet_hook; 552 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 553 privp->debug_hook = hook; 554 hook->private = &privp->debug_hook; 555 } else { 556 /* 557 * Any other unique name is OK. 558 * The infrastructure has already checked that it's unique, 559 * so just allocate it and hook it in. 560 */ 561 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO); 562 if (sp == NULL) 563 return (ENOMEM); 564 565 hook->private = sp; 566 sp->hook = hook; 567 } 568 return(0); 569 } 570 571 /* 572 * Get a netgraph control message. 573 * Check it is one we understand. If needed, send a response. 574 * We sometimes save the address for an async action later. 575 * Always free the message. 576 */ 577 static int 578 ng_pppoe_rcvmsg(node_p node, 579 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 580 { 581 priv_p privp = node->private; 582 struct ngpppoe_init_data *ourmsg = NULL; 583 struct ng_mesg *resp = NULL; 584 int error = 0; 585 hook_p hook = NULL; 586 sessp sp = NULL; 587 negp neg = NULL; 588 589 AAA 590 /* Deal with message according to cookie and command */ 591 switch (msg->header.typecookie) { 592 case NGM_PPPOE_COOKIE: 593 switch (msg->header.cmd) { 594 case NGM_PPPOE_CONNECT: 595 case NGM_PPPOE_LISTEN: 596 case NGM_PPPOE_OFFER: 597 case NGM_PPPOE_SERVICE: 598 ourmsg = (struct ngpppoe_init_data *)msg->data; 599 if (( sizeof(*ourmsg) > msg->header.arglen) 600 || ((sizeof(*ourmsg) + ourmsg->data_len) 601 > msg->header.arglen)) { 602 kprintf("pppoe_rcvmsg: bad arg size"); 603 LEAVE(EMSGSIZE); 604 } 605 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 606 kprintf("pppoe: init data too long (%d)\n", 607 ourmsg->data_len); 608 LEAVE(EMSGSIZE); 609 } 610 /* make sure strcmp will terminate safely */ 611 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 612 613 /* cycle through all known hooks */ 614 LIST_FOREACH(hook, &node->hooks, hooks) { 615 if (hook->name 616 && strcmp(hook->name, ourmsg->hook) == 0) 617 break; 618 } 619 if (hook == NULL) { 620 LEAVE(ENOENT); 621 } 622 if ((hook->private == &privp->debug_hook) 623 || (hook->private == &privp->ethernet_hook)) { 624 LEAVE(EINVAL); 625 } 626 sp = hook->private; 627 628 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 629 /* 630 * Ensure we aren't already listening for this 631 * service. 632 */ 633 if (pppoe_match_svc(node, ourmsg->data, 634 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 635 LEAVE(EEXIST); 636 } 637 } 638 639 /* 640 * PPPOE_SERVICE advertisments are set up 641 * on sessions that are in PRIMED state. 642 */ 643 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 644 break; 645 } 646 if (sp->state |= PPPOE_SNONE) { 647 kprintf("pppoe: Session already active\n"); 648 LEAVE(EISCONN); 649 } 650 651 /* 652 * set up prototype header 653 */ 654 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, 655 M_NOWAIT | M_ZERO); 656 657 if (neg == NULL) { 658 kprintf("pppoe: Session out of memory\n"); 659 LEAVE(ENOMEM); 660 } 661 MGETHDR(neg->m, MB_DONTWAIT, MT_DATA); 662 if(neg->m == NULL) { 663 kprintf("pppoe: Session out of mbufs\n"); 664 FREE(neg, M_NETGRAPH); 665 LEAVE(ENOBUFS); 666 } 667 neg->m->m_pkthdr.rcvif = NULL; 668 MCLGET(neg->m, MB_DONTWAIT); 669 if ((neg->m->m_flags & M_EXT) == 0) { 670 kprintf("pppoe: Session out of mcls\n"); 671 m_freem(neg->m); 672 FREE(neg, M_NETGRAPH); 673 LEAVE(ENOBUFS); 674 } 675 sp->neg = neg; 676 callout_init(&neg->timeout_ch); 677 neg->m->m_len = sizeof(struct pppoe_full_hdr); 678 neg->pkt = mtod(neg->m, union packet*); 679 neg->pkt->pkt_header.eh = eh_prototype; 680 neg->pkt->pkt_header.ph.ver = 0x1; 681 neg->pkt->pkt_header.ph.type = 0x1; 682 neg->pkt->pkt_header.ph.sid = 0x0000; 683 neg->timeout = 0; 684 685 strlcpy(sp->creator, retaddr, NG_NODESIZ); 686 } 687 switch (msg->header.cmd) { 688 case NGM_PPPOE_GET_STATUS: 689 { 690 struct ngpppoestat *stats; 691 692 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 693 if (!resp) { 694 LEAVE(ENOMEM); 695 } 696 stats = (struct ngpppoestat *) resp->data; 697 stats->packets_in = privp->packets_in; 698 stats->packets_out = privp->packets_out; 699 break; 700 } 701 case NGM_PPPOE_CONNECT: 702 /* 703 * Check the hook exists and is Uninitialised. 704 * Send a PADI request, and start the timeout logic. 705 * Store the originator of this message so we can send 706 * a success of fail message to them later. 707 * Move the session to SINIT 708 * Set up the session to the correct state and 709 * start it. 710 */ 711 neg->service.hdr.tag_type = PTT_SRV_NAME; 712 neg->service.hdr.tag_len = 713 htons((u_int16_t)ourmsg->data_len); 714 if (ourmsg->data_len) { 715 bcopy(ourmsg->data, 716 neg->service.data, ourmsg->data_len); 717 } 718 neg->service_len = ourmsg->data_len; 719 pppoe_start(sp); 720 break; 721 case NGM_PPPOE_LISTEN: 722 /* 723 * Check the hook exists and is Uninitialised. 724 * Install the service matching string. 725 * Store the originator of this message so we can send 726 * a success of fail message to them later. 727 * Move the hook to 'LISTENING' 728 */ 729 neg->service.hdr.tag_type = PTT_SRV_NAME; 730 neg->service.hdr.tag_len = 731 htons((u_int16_t)ourmsg->data_len); 732 733 if (ourmsg->data_len) { 734 bcopy(ourmsg->data, 735 neg->service.data, ourmsg->data_len); 736 } 737 neg->service_len = ourmsg->data_len; 738 neg->pkt->pkt_header.ph.code = PADT_CODE; 739 /* 740 * wait for PADI packet coming from ethernet 741 */ 742 sp->state = PPPOE_LISTENING; 743 break; 744 case NGM_PPPOE_OFFER: 745 /* 746 * Check the hook exists and is Uninitialised. 747 * Store the originator of this message so we can send 748 * a success of fail message to them later. 749 * Store the AC-Name given and go to PRIMED. 750 */ 751 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 752 neg->ac_name.hdr.tag_len = 753 htons((u_int16_t)ourmsg->data_len); 754 if (ourmsg->data_len) { 755 bcopy(ourmsg->data, 756 neg->ac_name.data, ourmsg->data_len); 757 } 758 neg->ac_name_len = ourmsg->data_len; 759 neg->pkt->pkt_header.ph.code = PADO_CODE; 760 /* 761 * Wait for PADI packet coming from hook 762 */ 763 sp->state = PPPOE_PRIMED; 764 break; 765 case NGM_PPPOE_SERVICE: 766 /* 767 * Check the session is primed. 768 * for now just allow ONE service to be advertised. 769 * If you do it twice you just overwrite. 770 */ 771 if (sp->state != PPPOE_PRIMED) { 772 kprintf("pppoe: Session not primed\n"); 773 LEAVE(EISCONN); 774 } 775 neg = sp->neg; 776 neg->service.hdr.tag_type = PTT_SRV_NAME; 777 neg->service.hdr.tag_len = 778 htons((u_int16_t)ourmsg->data_len); 779 780 if (ourmsg->data_len) 781 bcopy(ourmsg->data, neg->service.data, 782 ourmsg->data_len); 783 neg->service_len = ourmsg->data_len; 784 break; 785 default: 786 LEAVE(EINVAL); 787 } 788 break; 789 default: 790 LEAVE(EINVAL); 791 } 792 793 /* Take care of synchronous response, if any */ 794 if (rptr) 795 *rptr = resp; 796 else if (resp) 797 FREE(resp, M_NETGRAPH); 798 799 /* Free the message and return */ 800 quit: 801 FREE(msg, M_NETGRAPH); 802 return(error); 803 } 804 805 /* 806 * Start a client into the first state. A separate function because 807 * it can be needed if the negotiation times out. 808 */ 809 static void 810 pppoe_start(sessp sp) 811 { 812 struct { 813 struct pppoe_tag hdr; 814 union uniq data; 815 } __attribute ((packed)) uniqtag; 816 817 /* 818 * kick the state machine into starting up 819 */ 820 AAA 821 sp->state = PPPOE_SINIT; 822 /* reset the packet header to broadcast */ 823 sp->neg->pkt->pkt_header.eh = eh_prototype; 824 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 825 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 826 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 827 uniqtag.data.pointer = sp; 828 init_tags(sp); 829 insert_tag(sp, &uniqtag.hdr); 830 insert_tag(sp, &sp->neg->service.hdr); 831 make_packet(sp); 832 sendpacket(sp); 833 } 834 835 static int 836 send_acname(sessp sp, const struct pppoe_tag *tag) 837 { 838 int error, tlen; 839 struct ng_mesg *msg; 840 struct ngpppoe_sts *sts; 841 842 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 843 sizeof(struct ngpppoe_sts), M_NOWAIT); 844 if (msg == NULL) 845 return (ENOMEM); 846 847 sts = (struct ngpppoe_sts *)msg->data; 848 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 849 strncpy(sts->hook, tag->tag_data, tlen); 850 sts->hook[tlen] = '\0'; 851 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 852 853 return (error); 854 } 855 856 static int 857 send_sessionid(sessp sp) 858 { 859 int error; 860 struct ng_mesg *msg; 861 862 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 863 sizeof(u_int16_t), M_NOWAIT); 864 if (msg == NULL) 865 return (ENOMEM); 866 867 *(u_int16_t *)msg->data = sp->Session_ID; 868 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 869 870 return (error); 871 } 872 873 /* 874 * Receive data, and do something with it. 875 * The caller will never free m or meta, so 876 * if we use up this data or abort we must free BOTH of these. 877 */ 878 static int 879 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 880 { 881 node_p node = hook->node; 882 const priv_p privp = node->private; 883 sessp sp = hook->private; 884 const struct pppoe_full_hdr *wh; 885 const struct pppoe_hdr *ph; 886 int error = 0; 887 u_int16_t session; 888 u_int16_t length; 889 u_int8_t code; 890 const struct pppoe_tag *utag = NULL, *tag = NULL; 891 hook_p sendhook; 892 struct { 893 struct pppoe_tag hdr; 894 union uniq data; 895 } __attribute ((packed)) uniqtag; 896 negp neg = NULL; 897 898 AAA 899 if (hook->private == &privp->debug_hook) { 900 /* 901 * Data from the debug hook gets sent without modification 902 * straight to the ethernet. 903 */ 904 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 905 privp->packets_out++; 906 } else if (hook->private == &privp->ethernet_hook) { 907 /* 908 * Incoming data. 909 * Dig out various fields from the packet. 910 * use them to decide where to send it. 911 */ 912 913 privp->packets_in++; 914 if( m->m_len < sizeof(*wh)) { 915 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 916 if (m == NULL) { 917 kprintf("couldn't m_pullup\n"); 918 LEAVE(ENOBUFS); 919 } 920 } 921 wh = mtod(m, struct pppoe_full_hdr *); 922 ph = &wh->ph; 923 session = ntohs(wh->ph.sid); 924 length = ntohs(wh->ph.length); 925 code = wh->ph.code; 926 switch(wh->eh.ether_type) { 927 case ETHERTYPE_PPPOE_STUPID_DISC: 928 if (pppoe_mode == PPPOE_STANDARD) { 929 pppoe_mode = PPPOE_NONSTANDARD; 930 eh_prototype.ether_type = 931 ETHERTYPE_PPPOE_STUPID_DISC; 932 log(LOG_NOTICE, 933 "Switched to nonstandard PPPoE mode due to " 934 "packet from %*D\n", 935 ETHER_ADDR_LEN, 936 wh->eh.ether_shost, ":"); 937 } else if (pppoe_mode == PPPOE_KEEPSTANDARD) 938 log(LOG_NOTICE, 939 "Ignored nonstandard PPPoE packet " 940 "from %*D\n", 941 ETHER_ADDR_LEN, 942 wh->eh.ether_shost, ":"); 943 /* fall through */ 944 case ETHERTYPE_PPPOE_DISC: 945 /* 946 * We need to try to make sure that the tag area 947 * is contiguous, or we could wander off the end 948 * of a buffer and make a mess. 949 * (Linux wouldn't have this problem). 950 */ 951 /*XXX fix this mess */ 952 953 if (m->m_pkthdr.len <= MHLEN) { 954 if( m->m_len < m->m_pkthdr.len) { 955 m = m_pullup(m, m->m_pkthdr.len); 956 if (m == NULL) { 957 kprintf("couldn't m_pullup\n"); 958 LEAVE(ENOBUFS); 959 } 960 } 961 } 962 if (m->m_len != m->m_pkthdr.len) { 963 /* 964 * It's not all in one piece. 965 * We need to do extra work. 966 */ 967 kprintf("packet fragmented\n"); 968 LEAVE(EMSGSIZE); 969 } 970 971 switch(code) { 972 case PADI_CODE: 973 /* 974 * We are a server: 975 * Look for a hook with the required service 976 * and send the ENTIRE packet up there. 977 * It should come back to a new hook in 978 * PRIMED state. Look there for further 979 * processing. 980 */ 981 tag = get_tag(ph, PTT_SRV_NAME); 982 if (tag == NULL) { 983 kprintf("no service tag\n"); 984 LEAVE(ENETUNREACH); 985 } 986 sendhook = pppoe_match_svc(hook->node, 987 tag->tag_data, ntohs(tag->tag_len), 988 NG_MATCH_ANY); 989 if (sendhook) { 990 NG_SEND_DATA(error, sendhook, m, meta); 991 } else { 992 LEAVE(ENETUNREACH); 993 } 994 break; 995 case PADO_CODE: 996 /* 997 * We are a client: 998 * Use the host_uniq tag to find the 999 * hook this is in response to. 1000 * Received #2, now send #3 1001 * For now simply accept the first we receive. 1002 */ 1003 utag = get_tag(ph, PTT_HOST_UNIQ); 1004 if ((utag == NULL) 1005 || (ntohs(utag->tag_len) != sizeof(sp))) { 1006 kprintf("no host unique field\n"); 1007 LEAVE(ENETUNREACH); 1008 } 1009 1010 sendhook = pppoe_finduniq(node, utag); 1011 if (sendhook == NULL) { 1012 kprintf("no matching session\n"); 1013 LEAVE(ENETUNREACH); 1014 } 1015 1016 /* 1017 * Check the session is in the right state. 1018 * It needs to be in PPPOE_SINIT. 1019 */ 1020 sp = sendhook->private; 1021 if (sp->state != PPPOE_SINIT) { 1022 kprintf("session in wrong state\n"); 1023 LEAVE(ENETUNREACH); 1024 } 1025 neg = sp->neg; 1026 callout_stop(&neg->timeout_ch); 1027 1028 /* 1029 * This is the first time we hear 1030 * from the server, so note it's 1031 * unicast address, replacing the 1032 * broadcast address . 1033 */ 1034 bcopy(wh->eh.ether_shost, 1035 neg->pkt->pkt_header.eh.ether_dhost, 1036 ETHER_ADDR_LEN); 1037 neg->timeout = 0; 1038 neg->pkt->pkt_header.ph.code = PADR_CODE; 1039 init_tags(sp); 1040 insert_tag(sp, utag); /* Host Unique */ 1041 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1042 insert_tag(sp, tag); /* return cookie */ 1043 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1044 insert_tag(sp, tag); /* return it */ 1045 send_acname(sp, tag); 1046 } 1047 insert_tag(sp, &neg->service.hdr); /* Service */ 1048 scan_tags(sp, ph); 1049 make_packet(sp); 1050 sp->state = PPPOE_SREQ; 1051 sendpacket(sp); 1052 break; 1053 case PADR_CODE: 1054 1055 /* 1056 * We are a server: 1057 * Use the ac_cookie tag to find the 1058 * hook this is in response to. 1059 */ 1060 utag = get_tag(ph, PTT_AC_COOKIE); 1061 if ((utag == NULL) 1062 || (ntohs(utag->tag_len) != sizeof(sp))) { 1063 LEAVE(ENETUNREACH); 1064 } 1065 1066 sendhook = pppoe_finduniq(node, utag); 1067 if (sendhook == NULL) { 1068 LEAVE(ENETUNREACH); 1069 } 1070 1071 /* 1072 * Check the session is in the right state. 1073 * It needs to be in PPPOE_SOFFER 1074 * or PPPOE_NEWCONNECTED. If the latter, 1075 * then this is a retry by the client. 1076 * so be nice, and resend. 1077 */ 1078 sp = sendhook->private; 1079 if (sp->state == PPPOE_NEWCONNECTED) { 1080 /* 1081 * Whoa! drop back to resend that 1082 * PADS packet. 1083 * We should still have a copy of it. 1084 */ 1085 sp->state = PPPOE_SOFFER; 1086 } 1087 if (sp->state != PPPOE_SOFFER) { 1088 LEAVE (ENETUNREACH); 1089 break; 1090 } 1091 neg = sp->neg; 1092 callout_stop(&neg->timeout_ch); 1093 neg->pkt->pkt_header.ph.code = PADS_CODE; 1094 if (sp->Session_ID == 0) 1095 neg->pkt->pkt_header.ph.sid = 1096 htons(sp->Session_ID 1097 = get_new_sid(node)); 1098 send_sessionid(sp); 1099 neg->timeout = 0; 1100 /* 1101 * start working out the tags to respond with. 1102 */ 1103 init_tags(sp); 1104 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1105 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1106 insert_tag(sp, tag);/* return service */ 1107 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1108 insert_tag(sp, tag); /* return it */ 1109 insert_tag(sp, utag); /* ac_cookie */ 1110 scan_tags(sp, ph); 1111 make_packet(sp); 1112 sp->state = PPPOE_NEWCONNECTED; 1113 sendpacket(sp); 1114 /* 1115 * Having sent the last Negotiation header, 1116 * Set up the stored packet header to 1117 * be correct for the actual session. 1118 * But keep the negotialtion stuff 1119 * around in case we need to resend this last 1120 * packet. We'll discard it when we move 1121 * from NEWCONNECTED to CONNECTED 1122 */ 1123 sp->pkt_hdr = neg->pkt->pkt_header; 1124 if (pppoe_mode == PPPOE_NONSTANDARD) 1125 sp->pkt_hdr.eh.ether_type 1126 = ETHERTYPE_PPPOE_STUPID_SESS; 1127 else 1128 sp->pkt_hdr.eh.ether_type 1129 = ETHERTYPE_PPPOE_SESS; 1130 sp->pkt_hdr.ph.code = 0; 1131 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1132 break; 1133 case PADS_CODE: 1134 /* 1135 * We are a client: 1136 * Use the host_uniq tag to find the 1137 * hook this is in response to. 1138 * take the session ID and store it away. 1139 * Also make sure the pre-made header is 1140 * correct and set us into Session mode. 1141 */ 1142 utag = get_tag(ph, PTT_HOST_UNIQ); 1143 if ((utag == NULL) 1144 || (ntohs(utag->tag_len) != sizeof(sp))) { 1145 LEAVE (ENETUNREACH); 1146 break; 1147 } 1148 sendhook = pppoe_finduniq(node, utag); 1149 if (sendhook == NULL) { 1150 LEAVE(ENETUNREACH); 1151 } 1152 1153 /* 1154 * Check the session is in the right state. 1155 * It needs to be in PPPOE_SREQ. 1156 */ 1157 sp = sendhook->private; 1158 if (sp->state != PPPOE_SREQ) { 1159 LEAVE(ENETUNREACH); 1160 } 1161 neg = sp->neg; 1162 callout_stop(&neg->timeout_ch); 1163 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1164 sp->Session_ID = ntohs(wh->ph.sid); 1165 send_sessionid(sp); 1166 neg->timeout = 0; 1167 sp->state = PPPOE_CONNECTED; 1168 /* 1169 * Now we have gone to Connected mode, 1170 * Free all resources needed for 1171 * negotiation. 1172 * Keep a copy of the header we will be using. 1173 */ 1174 sp->pkt_hdr = neg->pkt->pkt_header; 1175 if (pppoe_mode == PPPOE_NONSTANDARD) 1176 sp->pkt_hdr.eh.ether_type 1177 = ETHERTYPE_PPPOE_STUPID_SESS; 1178 else 1179 sp->pkt_hdr.eh.ether_type 1180 = ETHERTYPE_PPPOE_SESS; 1181 sp->pkt_hdr.ph.code = 0; 1182 m_freem(neg->m); 1183 FREE(sp->neg, M_NETGRAPH); 1184 sp->neg = NULL; 1185 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1186 break; 1187 case PADT_CODE: 1188 /* 1189 * Send a 'close' message to the controlling 1190 * process (the one that set us up); 1191 * And then tear everything down. 1192 * 1193 * Find matching peer/session combination. 1194 */ 1195 sendhook = pppoe_findsession(node, wh); 1196 NG_FREE_DATA(m, meta); /* no longer needed */ 1197 if (sendhook == NULL) { 1198 LEAVE(ENETUNREACH); 1199 } 1200 /* send message to creator */ 1201 /* close hook */ 1202 if (sendhook) { 1203 ng_destroy_hook(sendhook); 1204 } 1205 break; 1206 default: 1207 LEAVE(EPFNOSUPPORT); 1208 } 1209 break; 1210 case ETHERTYPE_PPPOE_STUPID_SESS: 1211 case ETHERTYPE_PPPOE_SESS: 1212 /* 1213 * find matching peer/session combination. 1214 */ 1215 sendhook = pppoe_findsession(node, wh); 1216 if (sendhook == NULL) { 1217 LEAVE (ENETUNREACH); 1218 break; 1219 } 1220 sp = sendhook->private; 1221 m_adj(m, sizeof(*wh)); 1222 if (m->m_pkthdr.len < length) { 1223 /* Packet too short, dump it */ 1224 LEAVE(EMSGSIZE); 1225 } 1226 1227 /* Also need to trim excess at the end */ 1228 if (m->m_pkthdr.len > length) { 1229 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1230 } 1231 if ( sp->state != PPPOE_CONNECTED) { 1232 if (sp->state == PPPOE_NEWCONNECTED) { 1233 sp->state = PPPOE_CONNECTED; 1234 /* 1235 * Now we have gone to Connected mode, 1236 * Free all resources needed for 1237 * negotiation. Be paranoid about 1238 * whether there may be a timeout. 1239 */ 1240 m_freem(sp->neg->m); 1241 callout_stop(&sp->neg->timeout_ch); 1242 FREE(sp->neg, M_NETGRAPH); 1243 sp->neg = NULL; 1244 } else { 1245 LEAVE (ENETUNREACH); 1246 break; 1247 } 1248 } 1249 NG_SEND_DATA( error, sendhook, m, meta); 1250 break; 1251 default: 1252 LEAVE(EPFNOSUPPORT); 1253 } 1254 } else { 1255 /* 1256 * Not ethernet or debug hook.. 1257 * 1258 * The packet has come in on a normal hook. 1259 * We need to find out what kind of hook, 1260 * So we can decide how to handle it. 1261 * Check the hook's state. 1262 */ 1263 sp = hook->private; 1264 switch (sp->state) { 1265 case PPPOE_NEWCONNECTED: 1266 case PPPOE_CONNECTED: { 1267 static const u_char addrctrl[] = { 0xff, 0x03 }; 1268 struct pppoe_full_hdr *wh; 1269 1270 /* 1271 * Remove PPP address and control fields, if any. 1272 * For example, ng_ppp(4) always sends LCP packets 1273 * with address and control fields as required by 1274 * generic PPP. PPPoE is an exception to the rule. 1275 */ 1276 if (m->m_pkthdr.len >= 2) { 1277 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1278 LEAVE(ENOBUFS); 1279 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1280 m_adj(m, 2); 1281 } 1282 /* 1283 * Bang in a pre-made header, and set the length up 1284 * to be correct. Then send it to the ethernet driver. 1285 * But first correct the length. 1286 */ 1287 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1288 M_PREPEND(m, sizeof(*wh), MB_DONTWAIT); 1289 if (m == NULL) { 1290 LEAVE(ENOBUFS); 1291 } 1292 wh = mtod(m, struct pppoe_full_hdr *); 1293 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1294 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1295 privp->packets_out++; 1296 break; 1297 } 1298 case PPPOE_PRIMED: 1299 /* 1300 * A PADI packet is being returned by the application 1301 * that has set up this hook. This indicates that it 1302 * wants us to offer service. 1303 */ 1304 neg = sp->neg; 1305 if (m->m_len < sizeof(*wh)) { 1306 m = m_pullup(m, sizeof(*wh)); 1307 if (m == NULL) { 1308 LEAVE(ENOBUFS); 1309 } 1310 } 1311 wh = mtod(m, struct pppoe_full_hdr *); 1312 ph = &wh->ph; 1313 session = ntohs(wh->ph.sid); 1314 length = ntohs(wh->ph.length); 1315 code = wh->ph.code; 1316 if ( code != PADI_CODE) { 1317 LEAVE(EINVAL); 1318 }; 1319 callout_stop(&neg->timeout_ch); 1320 1321 /* 1322 * This is the first time we hear 1323 * from the client, so note it's 1324 * unicast address, replacing the 1325 * broadcast address. 1326 */ 1327 bcopy(wh->eh.ether_shost, 1328 neg->pkt->pkt_header.eh.ether_dhost, 1329 ETHER_ADDR_LEN); 1330 sp->state = PPPOE_SOFFER; 1331 neg->timeout = 0; 1332 neg->pkt->pkt_header.ph.code = PADO_CODE; 1333 1334 /* 1335 * start working out the tags to respond with. 1336 */ 1337 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1338 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1339 uniqtag.data.pointer = sp; 1340 init_tags(sp); 1341 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1342 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1343 insert_tag(sp, tag); /* return service */ 1344 /* 1345 * If we have a NULL service request 1346 * and have an extra service defined in this hook, 1347 * then also add a tag for the extra service. 1348 * XXX this is a hack. eventually we should be able 1349 * to support advertising many services, not just one 1350 */ 1351 if (((tag == NULL) || (tag->tag_len == 0)) 1352 && (neg->service.hdr.tag_len != 0)) { 1353 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1354 } 1355 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1356 insert_tag(sp, tag); /* returned hostunique */ 1357 insert_tag(sp, &uniqtag.hdr); 1358 scan_tags(sp, ph); 1359 make_packet(sp); 1360 sendpacket(sp); 1361 break; 1362 1363 /* 1364 * Packets coming from the hook make no sense 1365 * to sessions in these states. Throw them away. 1366 */ 1367 case PPPOE_SINIT: 1368 case PPPOE_SREQ: 1369 case PPPOE_SOFFER: 1370 case PPPOE_SNONE: 1371 case PPPOE_LISTENING: 1372 case PPPOE_DEAD: 1373 default: 1374 LEAVE(ENETUNREACH); 1375 } 1376 } 1377 quit: 1378 NG_FREE_DATA(m, meta); 1379 return error; 1380 } 1381 1382 /* 1383 * Do local shutdown processing.. 1384 * If we are a persistant device, we might refuse to go away, and 1385 * we'd only remove our links and reset ourself. 1386 */ 1387 static int 1388 ng_pppoe_rmnode(node_p node) 1389 { 1390 const priv_p privdata = node->private; 1391 1392 AAA 1393 node->flags |= NG_INVALID; 1394 ng_cutlinks(node); 1395 ng_unname(node); 1396 node->private = NULL; 1397 ng_unref(privdata->node); 1398 FREE(privdata, M_NETGRAPH); 1399 return (0); 1400 } 1401 1402 /* 1403 * This is called once we've already connected a new hook to the other node. 1404 * It gives us a chance to balk at the last minute. 1405 */ 1406 static int 1407 ng_pppoe_connect(hook_p hook) 1408 { 1409 /* be really amiable and just say "YUP that's OK by me! " */ 1410 return (0); 1411 } 1412 1413 /* 1414 * Hook disconnection 1415 * 1416 * Clean up all dangling links and information about the session/hook. 1417 * For this type, removal of the last link destroys the node 1418 */ 1419 static int 1420 ng_pppoe_disconnect(hook_p hook) 1421 { 1422 node_p node = hook->node; 1423 priv_p privp = node->private; 1424 sessp sp; 1425 int hooks; 1426 1427 AAA 1428 hooks = node->numhooks; /* this one already not counted */ 1429 if (hook->private == &privp->debug_hook) { 1430 privp->debug_hook = NULL; 1431 } else if (hook->private == &privp->ethernet_hook) { 1432 privp->ethernet_hook = NULL; 1433 ng_rmnode(node); 1434 } else { 1435 sp = hook->private; 1436 if (sp->state != PPPOE_SNONE ) { 1437 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1438 } 1439 /* 1440 * According to the spec, if we are connected, 1441 * we should send a DISC packet if we are shutting down 1442 * a session. 1443 */ 1444 if ((privp->ethernet_hook) 1445 && ((sp->state == PPPOE_CONNECTED) 1446 || (sp->state == PPPOE_NEWCONNECTED))) { 1447 struct mbuf *m; 1448 struct pppoe_full_hdr *wh; 1449 struct pppoe_tag *tag; 1450 int msglen = strlen(SIGNOFF); 1451 void *dummy = NULL; 1452 int error = 0; 1453 1454 /* revert the stored header to DISC/PADT mode */ 1455 wh = &sp->pkt_hdr; 1456 wh->ph.code = PADT_CODE; 1457 if (pppoe_mode == PPPOE_NONSTANDARD) 1458 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1459 else 1460 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1461 1462 /* generate a packet of that type */ 1463 MGETHDR(m, MB_DONTWAIT, MT_DATA); 1464 if(m == NULL) 1465 kprintf("pppoe: Session out of mbufs\n"); 1466 else { 1467 m->m_pkthdr.rcvif = NULL; 1468 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1469 bcopy((caddr_t)wh, mtod(m, caddr_t), 1470 sizeof(*wh)); 1471 /* 1472 * Add a General error message and adjust 1473 * sizes 1474 */ 1475 wh = mtod(m, struct pppoe_full_hdr *); 1476 tag = wh->ph.tag; 1477 tag->tag_type = PTT_GEN_ERR; 1478 tag->tag_len = htons((u_int16_t)msglen); 1479 strncpy(tag->tag_data, SIGNOFF, msglen); 1480 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1481 msglen); 1482 wh->ph.length = htons(sizeof(*tag) + msglen); 1483 NG_SEND_DATA(error, privp->ethernet_hook, m, 1484 dummy); 1485 } 1486 } 1487 /* 1488 * As long as we have somewhere to store the timeout handle, 1489 * we may have a timeout pending.. get rid of it. 1490 */ 1491 if (sp->neg) { 1492 callout_stop(&sp->neg->timeout_ch); 1493 if (sp->neg->m) 1494 m_freem(sp->neg->m); 1495 FREE(sp->neg, M_NETGRAPH); 1496 } 1497 FREE(sp, M_NETGRAPH); 1498 hook->private = NULL; 1499 /* work out how many session hooks there are */ 1500 /* Node goes away on last session hook removal */ 1501 if (privp->ethernet_hook) hooks -= 1; 1502 if (privp->debug_hook) hooks -= 1; 1503 } 1504 if (node->numhooks == 0) 1505 ng_rmnode(node); 1506 return (0); 1507 } 1508 1509 /* 1510 * timeouts come here. 1511 */ 1512 static void 1513 pppoe_ticker(void *arg) 1514 { 1515 hook_p hook = arg; 1516 sessp sp = hook->private; 1517 negp neg = sp->neg; 1518 int error = 0; 1519 struct mbuf *m0 = NULL; 1520 priv_p privp = hook->node->private; 1521 meta_p dummy = NULL; 1522 1523 crit_enter(); 1524 AAA 1525 switch(sp->state) { 1526 /* 1527 * resend the last packet, using an exponential backoff. 1528 * After a period of time, stop growing the backoff, 1529 * and either leave it, or revert to the start. 1530 */ 1531 case PPPOE_SINIT: 1532 case PPPOE_SREQ: 1533 /* timeouts on these produce resends */ 1534 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1535 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1536 callout_reset(&neg->timeout_ch, neg->timeout * hz, 1537 pppoe_ticker, hook); 1538 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1539 if (sp->state == PPPOE_SREQ) { 1540 /* revert to SINIT mode */ 1541 pppoe_start(sp); 1542 } else { 1543 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1544 } 1545 } 1546 break; 1547 case PPPOE_PRIMED: 1548 case PPPOE_SOFFER: 1549 /* a timeout on these says "give up" */ 1550 ng_destroy_hook(hook); 1551 break; 1552 default: 1553 /* timeouts have no meaning in other states */ 1554 kprintf("pppoe: unexpected timeout\n"); 1555 } 1556 crit_exit(); 1557 } 1558 1559 1560 static void 1561 sendpacket(sessp sp) 1562 { 1563 int error = 0; 1564 struct mbuf *m0 = NULL; 1565 hook_p hook = sp->hook; 1566 negp neg = sp->neg; 1567 priv_p privp = hook->node->private; 1568 meta_p dummy = NULL; 1569 1570 AAA 1571 switch(sp->state) { 1572 case PPPOE_LISTENING: 1573 case PPPOE_DEAD: 1574 case PPPOE_SNONE: 1575 case PPPOE_CONNECTED: 1576 kprintf("pppoe: sendpacket: unexpected state\n"); 1577 break; 1578 1579 case PPPOE_NEWCONNECTED: 1580 /* send the PADS without a timeout - we're now connected */ 1581 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1582 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1583 break; 1584 1585 case PPPOE_PRIMED: 1586 /* No packet to send, but set up the timeout */ 1587 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1588 pppoe_ticker, hook); 1589 break; 1590 1591 case PPPOE_SOFFER: 1592 /* 1593 * send the offer but if they don't respond 1594 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1595 */ 1596 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1597 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1598 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1599 pppoe_ticker, hook); 1600 break; 1601 1602 case PPPOE_SINIT: 1603 case PPPOE_SREQ: 1604 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT); 1605 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1606 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz, 1607 pppoe_ticker, hook); 1608 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1609 break; 1610 1611 default: 1612 error = EINVAL; 1613 kprintf("pppoe: timeout: bad state\n"); 1614 } 1615 /* return (error); */ 1616 } 1617 1618 /* 1619 * Parse an incoming packet to see if any tags should be copied to the 1620 * output packet. Don't do any tags that have been handled in the main 1621 * state machine. 1622 */ 1623 static const struct pppoe_tag* 1624 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1625 { 1626 const char *const end = (const char *)next_tag(ph); 1627 const char *ptn; 1628 const struct pppoe_tag *pt = &ph->tag[0]; 1629 /* 1630 * Keep processing tags while a tag header will still fit. 1631 */ 1632 AAA 1633 while((const char*)(pt + 1) <= end) { 1634 /* 1635 * If the tag data would go past the end of the packet, abort. 1636 */ 1637 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1638 if(ptn > end) 1639 return NULL; 1640 1641 switch (pt->tag_type) { 1642 case PTT_RELAY_SID: 1643 insert_tag(sp, pt); 1644 break; 1645 case PTT_EOL: 1646 return NULL; 1647 case PTT_SRV_NAME: 1648 case PTT_AC_NAME: 1649 case PTT_HOST_UNIQ: 1650 case PTT_AC_COOKIE: 1651 case PTT_VENDOR: 1652 case PTT_SRV_ERR: 1653 case PTT_SYS_ERR: 1654 case PTT_GEN_ERR: 1655 break; 1656 } 1657 pt = (const struct pppoe_tag*)ptn; 1658 } 1659 return NULL; 1660 } 1661 1662 static int 1663 pppoe_send_event(sessp sp, enum cmd cmdid) 1664 { 1665 int error; 1666 struct ng_mesg *msg; 1667 struct ngpppoe_sts *sts; 1668 1669 AAA 1670 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1671 sizeof(struct ngpppoe_sts), M_NOWAIT); 1672 if (msg == NULL) 1673 return (ENOMEM); 1674 sts = (struct ngpppoe_sts *)msg->data; 1675 strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ); 1676 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1677 return (error); 1678 } 1679