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 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41 */ 42 #if 0 43 #define AAA kprintf("pppoe: %s\n", __func__ ); 44 #define BBB kprintf("-%d-", __LINE__ ); 45 #else 46 #define AAA 47 #define BBB 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 #include <sys/mbuf.h> 54 #include <sys/malloc.h> 55 #include <sys/errno.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <sys/thread2.h> 59 60 #include <net/if_var.h> 61 #include <net/ethernet.h> 62 63 #include <netgraph/ng_message.h> 64 #include <netgraph/netgraph.h> 65 #include "ng_pppoe.h" 66 67 #define SIGNOFF "session closed" 68 69 /* 70 * This section contains the netgraph method declarations for the 71 * pppoe node. These methods define the netgraph pppoe 'type'. 72 */ 73 74 static ng_constructor_t ng_pppoe_constructor; 75 static ng_rcvmsg_t ng_pppoe_rcvmsg; 76 static ng_shutdown_t ng_pppoe_rmnode; 77 static ng_newhook_t ng_pppoe_newhook; 78 static ng_connect_t ng_pppoe_connect; 79 static ng_rcvdata_t ng_pppoe_rcvdata; 80 static ng_disconnect_t ng_pppoe_disconnect; 81 82 /* Netgraph node type descriptor */ 83 static struct ng_type typestruct = { 84 NG_VERSION, 85 NG_PPPOE_NODE_TYPE, 86 NULL, 87 ng_pppoe_constructor, 88 ng_pppoe_rcvmsg, 89 ng_pppoe_rmnode, 90 ng_pppoe_newhook, 91 NULL, 92 ng_pppoe_connect, 93 ng_pppoe_rcvdata, 94 ng_pppoe_rcvdata, 95 ng_pppoe_disconnect, 96 NULL 97 }; 98 NETGRAPH_INIT(pppoe, &typestruct); 99 100 /* 101 * States for the session state machine. 102 * These have no meaning if there is no hook attached yet. 103 */ 104 enum state { 105 PPPOE_SNONE=0, /* [both] Initial state */ 106 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 107 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 108 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 109 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 110 PPPOE_SREQ, /* [Client] Sent a Request */ 111 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 112 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 113 PPPOE_DEAD /* [Both] */ 114 }; 115 116 #define NUMTAGS 20 /* number of tags we are set up to work with */ 117 118 /* 119 * Information we store for each hook on each node for negotiating the 120 * session. The mbuf and cluster are freed once negotiation has completed. 121 * The whole negotiation block is then discarded. 122 */ 123 124 struct sess_neg { 125 struct mbuf *m; /* holds cluster with last sent packet */ 126 union packet *pkt; /* points within the above cluster */ 127 struct callout timeout_ch; 128 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 129 u_int numtags; 130 const struct pppoe_tag *tags[NUMTAGS]; 131 u_int service_len; 132 u_int ac_name_len; 133 134 struct datatag service; 135 struct datatag ac_name; 136 }; 137 typedef struct sess_neg *negp; 138 139 /* 140 * Session information that is needed after connection. 141 */ 142 struct sess_con { 143 hook_p hook; 144 u_int16_t Session_ID; 145 enum state state; 146 char creator[NG_NODESIZ]; /* who to notify */ 147 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 148 negp neg; /* used when negotiating */ 149 /*struct sess_con *hash_next;*/ /* not yet used */ 150 }; 151 typedef struct sess_con *sessp; 152 153 /* 154 * Information we store for each node 155 */ 156 struct PPPOE { 157 node_p node; /* back pointer to node */ 158 hook_p ethernet_hook; 159 hook_p debug_hook; 160 u_int packets_in; /* packets in from ethernet */ 161 u_int packets_out; /* packets out towards ethernet */ 162 u_int32_t flags; 163 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 164 }; 165 typedef struct PPPOE *priv_p; 166 167 struct ether_header eh_prototype = 168 {{0xff,0xff,0xff,0xff,0xff,0xff}, 169 {0x00,0x00,0x00,0x00,0x00,0x00}, 170 ETHERTYPE_PPPOE_DISC}; 171 172 #define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */ 173 #define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */ 174 #define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */ 175 static int pppoe_mode = PPPOE_KEEPSTANDARD; 176 177 static int 178 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 179 { 180 int error; 181 int val; 182 183 val = pppoe_mode; 184 error = sysctl_handle_int(oidp, &val, 0, req); 185 if (error != 0 || req->newptr == NULL) 186 return (error); 187 switch (val) { 188 case PPPOE_NONSTANDARD: 189 pppoe_mode = PPPOE_NONSTANDARD; 190 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 191 break; 192 case PPPOE_STANDARD: 193 pppoe_mode = PPPOE_STANDARD; 194 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 195 break; 196 case PPPOE_KEEPSTANDARD: 197 pppoe_mode = PPPOE_KEEPSTANDARD; 198 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 199 break; 200 default: 201 return (EINVAL); 202 } 203 return (0); 204 } 205 206 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 207 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype"); 208 209 union uniq { 210 char bytes[sizeof(void *)]; 211 void * pointer; 212 }; 213 214 #define LEAVE(x) do { error = x; goto quit; } while(0) 215 static void pppoe_start(sessp sp); 216 static void sendpacket(sessp sp); 217 static void pppoe_ticker(void *arg); 218 static const struct pppoe_tag *scan_tags(sessp sp, 219 const struct pppoe_hdr* ph); 220 static int pppoe_send_event(sessp sp, enum cmd cmdid); 221 222 /************************************************************************* 223 * Some basic utilities from the Linux version with author's permission.* 224 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 225 ************************************************************************/ 226 227 /* 228 * Generate a new session id 229 * XXX find out the FreeBSD locking scheme. 230 */ 231 static u_int16_t 232 get_new_sid(node_p node) 233 { 234 static int pppoe_sid = 10; 235 sessp sp; 236 hook_p hook; 237 u_int16_t val; 238 priv_p privp = node->private; 239 240 AAA 241 restart: 242 val = pppoe_sid++; 243 /* 244 * Spec says 0xFFFF is reserved. 245 * Also don't use 0x0000 246 */ 247 if (val == 0xffff) { 248 pppoe_sid = 20; 249 goto restart; 250 } 251 252 /* Check it isn't already in use */ 253 LIST_FOREACH(hook, &node->hooks, hooks) { 254 /* don't check special hooks */ 255 if ((hook->private == &privp->debug_hook) 256 || (hook->private == &privp->ethernet_hook)) 257 continue; 258 sp = hook->private; 259 if (sp->Session_ID == val) 260 goto restart; 261 } 262 263 return val; 264 } 265 266 267 /* 268 * Return the location where the next tag can be put 269 */ 270 static __inline const struct pppoe_tag* 271 next_tag(const struct pppoe_hdr* ph) 272 { 273 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 274 + ntohs(ph->length)); 275 } 276 277 /* 278 * Look for a tag of a specific type 279 * Don't trust any length the other end says. 280 * but assume we already sanity checked ph->length. 281 */ 282 static const struct pppoe_tag* 283 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 284 { 285 const char *const end = (const char *)next_tag(ph); 286 const char *ptn; 287 const struct pppoe_tag *pt = &ph->tag[0]; 288 /* 289 * Keep processing tags while a tag header will still fit. 290 */ 291 AAA 292 while((const char*)(pt + 1) <= end) { 293 /* 294 * If the tag data would go past the end of the packet, abort. 295 */ 296 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 297 if(ptn > end) 298 return NULL; 299 300 if(pt->tag_type == idx) 301 return pt; 302 303 pt = (const struct pppoe_tag*)ptn; 304 } 305 return NULL; 306 } 307 308 /************************************************************************** 309 * inlines to initialise or add tags to a session's tag list, 310 **************************************************************************/ 311 /* 312 * Initialise the session's tag list 313 */ 314 static void 315 init_tags(sessp sp) 316 { 317 AAA 318 if(sp->neg == NULL) { 319 kprintf("pppoe: asked to init NULL neg pointer\n"); 320 return; 321 } 322 sp->neg->numtags = 0; 323 } 324 325 static void 326 insert_tag(sessp sp, const struct pppoe_tag *tp) 327 { 328 int i; 329 negp neg; 330 331 AAA 332 if((neg = sp->neg) == NULL) { 333 kprintf("pppoe: asked to use NULL neg pointer\n"); 334 return; 335 } 336 if ((i = neg->numtags++) < NUMTAGS) { 337 neg->tags[i] = tp; 338 } else { 339 kprintf("pppoe: asked to add too many tags to packet\n"); 340 neg->numtags--; 341 } 342 } 343 344 /* 345 * Make up a packet, using the tags filled out for the session. 346 * 347 * Assume that the actual pppoe header and ethernet header 348 * are filled out externally to this routine. 349 * Also assume that neg->wh points to the correct 350 * location at the front of the buffer space. 351 */ 352 static void 353 make_packet(sessp sp) { 354 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 355 const struct pppoe_tag **tag; 356 char *dp; 357 int count; 358 int tlen; 359 u_int16_t length = 0; 360 361 AAA 362 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 363 kprintf("pppoe: make_packet called from wrong state\n"); 364 } 365 dp = (char *)wh->ph.tag; 366 for (count = 0, tag = sp->neg->tags; 367 ((count < sp->neg->numtags) && (count < NUMTAGS)); 368 tag++, count++) { 369 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 370 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 371 kprintf("pppoe: tags too long\n"); 372 sp->neg->numtags = count; 373 break; /* XXX chop off what's too long */ 374 } 375 bcopy(*tag, dp, tlen); 376 length += tlen; 377 dp += tlen; 378 } 379 wh->ph.length = htons(length); 380 sp->neg->m->m_len = length + sizeof(*wh); 381 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 382 } 383 384 /************************************************************************** 385 * Routine to match a service offered * 386 **************************************************************************/ 387 /* 388 * Find a hook that has a service string that matches that 389 * we are seeking. for now use a simple string. 390 * In the future we may need something like regexp(). 391 * for testing allow a null string to match 1st found and a null service 392 * to match all requests. Also make '*' do the same. 393 */ 394 395 #define NG_MATCH_EXACT 1 396 #define NG_MATCH_ANY 2 397 398 static hook_p 399 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 400 { 401 sessp sp = NULL; 402 negp neg = NULL; 403 priv_p privp = node->private; 404 hook_p allhook = NULL; 405 hook_p hook; 406 407 AAA 408 LIST_FOREACH(hook, &node->hooks, hooks) { 409 410 /* skip any hook that is debug or ethernet */ 411 if ((hook->private == &privp->debug_hook) 412 || (hook->private == &privp->ethernet_hook)) 413 continue; 414 sp = hook->private; 415 416 /* Skip any sessions which are not in LISTEN mode. */ 417 if ( sp->state != PPPOE_LISTENING) 418 continue; 419 420 neg = sp->neg; 421 422 /* Special case for a blank or "*" service name (wildcard) */ 423 if (match == NG_MATCH_ANY && neg->service_len == 1 && 424 neg->service.data[0] == '*') { 425 allhook = hook; 426 continue; 427 } 428 429 /* If the lengths don't match, that aint it. */ 430 if (neg->service_len != svc_len) 431 continue; 432 433 /* An exact match? */ 434 if (svc_len == 0) 435 break; 436 437 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 438 break; 439 } 440 return (hook ? hook : allhook); 441 } 442 /************************************************************************** 443 * Routine to find a particular session that matches an incoming packet * 444 **************************************************************************/ 445 static hook_p 446 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 447 { 448 sessp sp = NULL; 449 hook_p hook = NULL; 450 priv_p privp = node->private; 451 u_int16_t session = ntohs(wh->ph.sid); 452 453 /* 454 * find matching peer/session combination. 455 */ 456 AAA 457 LIST_FOREACH(hook, &node->hooks, hooks) { 458 /* don't check special hooks */ 459 if ((hook->private == &privp->debug_hook) 460 || (hook->private == &privp->ethernet_hook)) { 461 continue; 462 } 463 sp = hook->private; 464 if ( ( (sp->state == PPPOE_CONNECTED) 465 || (sp->state == PPPOE_NEWCONNECTED) ) 466 && (sp->Session_ID == session) 467 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 468 wh->eh.ether_shost, 469 ETHER_ADDR_LEN)) == 0) { 470 break; 471 } 472 } 473 return (hook); 474 } 475 476 static hook_p 477 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 478 { 479 hook_p hook = NULL; 480 priv_p privp = node->private; 481 union uniq uniq; 482 483 AAA 484 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 485 /* cycle through all known hooks */ 486 LIST_FOREACH(hook, &node->hooks, hooks) { 487 /* don't check special hooks */ 488 if ((hook->private == &privp->debug_hook) 489 || (hook->private == &privp->ethernet_hook)) 490 continue; 491 if (uniq.pointer == hook->private) 492 break; 493 } 494 return (hook); 495 } 496 497 /************************************************************************** 498 * start of Netgraph entrypoints * 499 **************************************************************************/ 500 501 /* 502 * Allocate the private data structure and the generic node 503 * and link them together. 504 * 505 * ng_make_node_common() returns with a generic node struct 506 * with a single reference for us.. we transfer it to the 507 * private structure.. when we free the private struct we must 508 * unref the node so it gets freed too. 509 */ 510 static int 511 ng_pppoe_constructor(node_p *nodep) 512 { 513 priv_p privdata; 514 int error; 515 516 AAA 517 /* Initialize private descriptor */ 518 privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO); 519 if (privdata == NULL) 520 return (ENOMEM); 521 522 /* Call the 'generic' (ie, superclass) node constructor */ 523 if ((error = ng_make_node_common(&typestruct, nodep))) { 524 kfree(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 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO); 563 if (sp == NULL) 564 return (ENOMEM); 565 566 hook->private = sp; 567 sp->hook = hook; 568 } 569 return(0); 570 } 571 572 /* 573 * Get a netgraph control message. 574 * Check it is one we understand. If needed, send a response. 575 * We sometimes save the address for an async action later. 576 * Always free the message. 577 */ 578 static int 579 ng_pppoe_rcvmsg(node_p node, 580 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 581 { 582 priv_p privp = node->private; 583 struct ngpppoe_init_data *ourmsg = NULL; 584 struct ng_mesg *resp = NULL; 585 int error = 0; 586 hook_p hook = NULL; 587 sessp sp = NULL; 588 negp neg = NULL; 589 590 AAA 591 /* Deal with message according to cookie and command */ 592 switch (msg->header.typecookie) { 593 case NGM_PPPOE_COOKIE: 594 switch (msg->header.cmd) { 595 case NGM_PPPOE_CONNECT: 596 case NGM_PPPOE_LISTEN: 597 case NGM_PPPOE_OFFER: 598 case NGM_PPPOE_SERVICE: 599 ourmsg = (struct ngpppoe_init_data *)msg->data; 600 if (( sizeof(*ourmsg) > msg->header.arglen) 601 || ((sizeof(*ourmsg) + ourmsg->data_len) 602 > msg->header.arglen)) { 603 kprintf("pppoe_rcvmsg: bad arg size"); 604 LEAVE(EMSGSIZE); 605 } 606 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 607 kprintf("pppoe: init data too long (%d)\n", 608 ourmsg->data_len); 609 LEAVE(EMSGSIZE); 610 } 611 /* make sure strcmp will terminate safely */ 612 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 613 614 /* cycle through all known hooks */ 615 LIST_FOREACH(hook, &node->hooks, hooks) { 616 if (hook->name 617 && strcmp(hook->name, ourmsg->hook) == 0) 618 break; 619 } 620 if (hook == NULL) { 621 LEAVE(ENOENT); 622 } 623 if ((hook->private == &privp->debug_hook) 624 || (hook->private == &privp->ethernet_hook)) { 625 LEAVE(EINVAL); 626 } 627 sp = hook->private; 628 629 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 630 /* 631 * Ensure we aren't already listening for this 632 * service. 633 */ 634 if (pppoe_match_svc(node, ourmsg->data, 635 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 636 LEAVE(EEXIST); 637 } 638 } 639 640 /* 641 * PPPOE_SERVICE advertisments are set up 642 * on sessions that are in PRIMED state. 643 */ 644 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 645 break; 646 } 647 if (sp->state != PPPOE_SNONE) { 648 kprintf("pppoe: Session already active\n"); 649 LEAVE(EISCONN); 650 } 651 652 /* 653 * set up prototype header 654 */ 655 neg = kmalloc(sizeof(*neg), M_NETGRAPH, 656 M_NOWAIT | M_ZERO); 657 658 if (neg == NULL) { 659 kprintf("pppoe: Session out of memory\n"); 660 LEAVE(ENOMEM); 661 } 662 MGETHDR(neg->m, M_NOWAIT, MT_DATA); 663 if(neg->m == NULL) { 664 kprintf("pppoe: Session out of mbufs\n"); 665 kfree(neg, M_NETGRAPH); 666 LEAVE(ENOBUFS); 667 } 668 neg->m->m_pkthdr.rcvif = NULL; 669 MCLGET(neg->m, M_NOWAIT); 670 if ((neg->m->m_flags & M_EXT) == 0) { 671 kprintf("pppoe: Session out of mcls\n"); 672 m_freem(neg->m); 673 kfree(neg, M_NETGRAPH); 674 LEAVE(ENOBUFS); 675 } 676 sp->neg = neg; 677 callout_init(&neg->timeout_ch); 678 neg->m->m_len = sizeof(struct pppoe_full_hdr); 679 neg->pkt = mtod(neg->m, union packet*); 680 neg->pkt->pkt_header.eh = eh_prototype; 681 neg->pkt->pkt_header.ph.ver = 0x1; 682 neg->pkt->pkt_header.ph.type = 0x1; 683 neg->pkt->pkt_header.ph.sid = 0x0000; 684 neg->timeout = 0; 685 686 strlcpy(sp->creator, retaddr, NG_NODESIZ); 687 } 688 switch (msg->header.cmd) { 689 case NGM_PPPOE_GET_STATUS: 690 { 691 struct ngpppoestat *stats; 692 693 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 694 if (!resp) { 695 LEAVE(ENOMEM); 696 } 697 stats = (struct ngpppoestat *) resp->data; 698 stats->packets_in = privp->packets_in; 699 stats->packets_out = privp->packets_out; 700 break; 701 } 702 case NGM_PPPOE_CONNECT: 703 /* 704 * Check the hook exists and is Uninitialised. 705 * Send a PADI request, and start the timeout logic. 706 * Store the originator of this message so we can send 707 * a success of fail message to them later. 708 * Move the session to SINIT 709 * Set up the session to the correct state and 710 * start it. 711 */ 712 neg->service.hdr.tag_type = PTT_SRV_NAME; 713 neg->service.hdr.tag_len = 714 htons((u_int16_t)ourmsg->data_len); 715 if (ourmsg->data_len) { 716 bcopy(ourmsg->data, 717 neg->service.data, ourmsg->data_len); 718 } 719 neg->service_len = ourmsg->data_len; 720 pppoe_start(sp); 721 break; 722 case NGM_PPPOE_LISTEN: 723 /* 724 * Check the hook exists and is Uninitialised. 725 * Install the service matching string. 726 * Store the originator of this message so we can send 727 * a success of fail message to them later. 728 * Move the hook to 'LISTENING' 729 */ 730 neg->service.hdr.tag_type = PTT_SRV_NAME; 731 neg->service.hdr.tag_len = 732 htons((u_int16_t)ourmsg->data_len); 733 734 if (ourmsg->data_len) { 735 bcopy(ourmsg->data, 736 neg->service.data, ourmsg->data_len); 737 } 738 neg->service_len = ourmsg->data_len; 739 neg->pkt->pkt_header.ph.code = PADT_CODE; 740 /* 741 * wait for PADI packet coming from ethernet 742 */ 743 sp->state = PPPOE_LISTENING; 744 break; 745 case NGM_PPPOE_OFFER: 746 /* 747 * Check the hook exists and is Uninitialised. 748 * Store the originator of this message so we can send 749 * a success of fail message to them later. 750 * Store the AC-Name given and go to PRIMED. 751 */ 752 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 753 neg->ac_name.hdr.tag_len = 754 htons((u_int16_t)ourmsg->data_len); 755 if (ourmsg->data_len) { 756 bcopy(ourmsg->data, 757 neg->ac_name.data, ourmsg->data_len); 758 } 759 neg->ac_name_len = ourmsg->data_len; 760 neg->pkt->pkt_header.ph.code = PADO_CODE; 761 /* 762 * Wait for PADI packet coming from hook 763 */ 764 sp->state = PPPOE_PRIMED; 765 break; 766 case NGM_PPPOE_SERVICE: 767 /* 768 * Check the session is primed. 769 * for now just allow ONE service to be advertised. 770 * If you do it twice you just overwrite. 771 */ 772 if (sp->state != PPPOE_PRIMED) { 773 kprintf("pppoe: Session not primed\n"); 774 LEAVE(EISCONN); 775 } 776 neg = sp->neg; 777 neg->service.hdr.tag_type = PTT_SRV_NAME; 778 neg->service.hdr.tag_len = 779 htons((u_int16_t)ourmsg->data_len); 780 781 if (ourmsg->data_len) 782 bcopy(ourmsg->data, neg->service.data, 783 ourmsg->data_len); 784 neg->service_len = ourmsg->data_len; 785 break; 786 default: 787 LEAVE(EINVAL); 788 } 789 break; 790 default: 791 LEAVE(EINVAL); 792 } 793 794 /* Take care of synchronous response, if any */ 795 if (rptr) 796 *rptr = resp; 797 else if (resp) 798 kfree(resp, M_NETGRAPH); 799 800 /* Free the message and return */ 801 quit: 802 kfree(msg, M_NETGRAPH); 803 return(error); 804 } 805 806 /* 807 * Start a client into the first state. A separate function because 808 * it can be needed if the negotiation times out. 809 */ 810 static void 811 pppoe_start(sessp sp) 812 { 813 struct { 814 struct pppoe_tag hdr; 815 union uniq data; 816 } __attribute ((packed)) uniqtag; 817 818 /* 819 * kick the state machine into starting up 820 */ 821 AAA 822 sp->state = PPPOE_SINIT; 823 /* reset the packet header to broadcast */ 824 sp->neg->pkt->pkt_header.eh = eh_prototype; 825 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 826 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 827 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 828 uniqtag.data.pointer = sp; 829 init_tags(sp); 830 insert_tag(sp, &uniqtag.hdr); 831 insert_tag(sp, &sp->neg->service.hdr); 832 make_packet(sp); 833 sendpacket(sp); 834 } 835 836 static int 837 send_acname(sessp sp, const struct pppoe_tag *tag) 838 { 839 int error, tlen; 840 struct ng_mesg *msg; 841 struct ngpppoe_sts *sts; 842 843 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 844 sizeof(struct ngpppoe_sts), M_NOWAIT); 845 if (msg == NULL) 846 return (ENOMEM); 847 848 sts = (struct ngpppoe_sts *)msg->data; 849 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 850 strncpy(sts->hook, tag->tag_data, tlen); 851 sts->hook[tlen] = '\0'; 852 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 853 854 return (error); 855 } 856 857 static int 858 send_sessionid(sessp sp) 859 { 860 int error; 861 struct ng_mesg *msg; 862 863 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 864 sizeof(u_int16_t), M_NOWAIT); 865 if (msg == NULL) 866 return (ENOMEM); 867 868 *(u_int16_t *)msg->data = sp->Session_ID; 869 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 870 871 return (error); 872 } 873 874 /* 875 * Receive data, and do something with it. 876 * The caller will never free m or meta, so 877 * if we use up this data or abort we must free BOTH of these. 878 */ 879 static int 880 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 881 { 882 node_p node = hook->node; 883 const priv_p privp = node->private; 884 sessp sp = hook->private; 885 const struct pppoe_full_hdr *wh; 886 const struct pppoe_hdr *ph; 887 int error = 0; 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 char ethstr[ETHER_ADDRSTRLEN + 1]; 898 899 AAA 900 if (hook->private == &privp->debug_hook) { 901 /* 902 * Data from the debug hook gets sent without modification 903 * straight to the ethernet. 904 */ 905 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 906 privp->packets_out++; 907 } else if (hook->private == &privp->ethernet_hook) { 908 /* 909 * Incoming data. 910 * Dig out various fields from the packet. 911 * use them to decide where to send it. 912 */ 913 914 privp->packets_in++; 915 if( m->m_len < sizeof(*wh)) { 916 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 917 if (m == NULL) { 918 kprintf("couldn't m_pullup\n"); 919 LEAVE(ENOBUFS); 920 } 921 } 922 wh = mtod(m, struct pppoe_full_hdr *); 923 ph = &wh->ph; 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 %s\n", 935 kether_ntoa(wh->eh.ether_shost, ethstr)); 936 } else if (pppoe_mode == PPPOE_KEEPSTANDARD) 937 log(LOG_NOTICE, 938 "Ignored nonstandard PPPoE packet " 939 "from %s\n", 940 kether_ntoa(wh->eh.ether_shost, ethstr)); 941 /* fall through */ 942 case ETHERTYPE_PPPOE_DISC: 943 /* 944 * We need to try to make sure that the tag area 945 * is contiguous, or we could wander off the end 946 * of a buffer and make a mess. 947 * (Linux wouldn't have this problem). 948 */ 949 /*XXX fix this mess */ 950 951 if (m->m_pkthdr.len <= MHLEN) { 952 if( m->m_len < m->m_pkthdr.len) { 953 m = m_pullup(m, m->m_pkthdr.len); 954 if (m == NULL) { 955 kprintf("couldn't m_pullup\n"); 956 LEAVE(ENOBUFS); 957 } 958 } 959 } 960 if (m->m_len != m->m_pkthdr.len) { 961 /* 962 * It's not all in one piece. 963 * We need to do extra work. 964 */ 965 kprintf("packet fragmented\n"); 966 LEAVE(EMSGSIZE); 967 } 968 969 switch(code) { 970 case PADI_CODE: 971 /* 972 * We are a server: 973 * Look for a hook with the required service 974 * and send the ENTIRE packet up there. 975 * It should come back to a new hook in 976 * PRIMED state. Look there for further 977 * processing. 978 */ 979 tag = get_tag(ph, PTT_SRV_NAME); 980 if (tag == NULL) { 981 kprintf("no service tag\n"); 982 LEAVE(ENETUNREACH); 983 } 984 sendhook = pppoe_match_svc(hook->node, 985 tag->tag_data, ntohs(tag->tag_len), 986 NG_MATCH_ANY); 987 if (sendhook) { 988 NG_SEND_DATA(error, sendhook, m, meta); 989 } else { 990 LEAVE(ENETUNREACH); 991 } 992 break; 993 case PADO_CODE: 994 /* 995 * We are a client: 996 * Use the host_uniq tag to find the 997 * hook this is in response to. 998 * Received #2, now send #3 999 * For now simply accept the first we receive. 1000 */ 1001 utag = get_tag(ph, PTT_HOST_UNIQ); 1002 if ((utag == NULL) 1003 || (ntohs(utag->tag_len) != sizeof(sp))) { 1004 kprintf("no host unique field\n"); 1005 LEAVE(ENETUNREACH); 1006 } 1007 1008 sendhook = pppoe_finduniq(node, utag); 1009 if (sendhook == NULL) { 1010 kprintf("no matching session\n"); 1011 LEAVE(ENETUNREACH); 1012 } 1013 1014 /* 1015 * Check the session is in the right state. 1016 * It needs to be in PPPOE_SINIT. 1017 */ 1018 sp = sendhook->private; 1019 if (sp->state != PPPOE_SINIT) { 1020 kprintf("session in wrong state\n"); 1021 LEAVE(ENETUNREACH); 1022 } 1023 neg = sp->neg; 1024 callout_stop(&neg->timeout_ch); 1025 1026 /* 1027 * This is the first time we hear 1028 * from the server, so note it's 1029 * unicast address, replacing the 1030 * broadcast address . 1031 */ 1032 bcopy(wh->eh.ether_shost, 1033 neg->pkt->pkt_header.eh.ether_dhost, 1034 ETHER_ADDR_LEN); 1035 neg->timeout = 0; 1036 neg->pkt->pkt_header.ph.code = PADR_CODE; 1037 init_tags(sp); 1038 insert_tag(sp, utag); /* Host Unique */ 1039 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1040 insert_tag(sp, tag); /* return cookie */ 1041 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1042 insert_tag(sp, tag); /* return it */ 1043 send_acname(sp, tag); 1044 } 1045 insert_tag(sp, &neg->service.hdr); /* Service */ 1046 scan_tags(sp, ph); 1047 make_packet(sp); 1048 sp->state = PPPOE_SREQ; 1049 sendpacket(sp); 1050 break; 1051 case PADR_CODE: 1052 1053 /* 1054 * We are a server: 1055 * Use the ac_cookie tag to find the 1056 * hook this is in response to. 1057 */ 1058 utag = get_tag(ph, PTT_AC_COOKIE); 1059 if ((utag == NULL) 1060 || (ntohs(utag->tag_len) != sizeof(sp))) { 1061 LEAVE(ENETUNREACH); 1062 } 1063 1064 sendhook = pppoe_finduniq(node, utag); 1065 if (sendhook == NULL) { 1066 LEAVE(ENETUNREACH); 1067 } 1068 1069 /* 1070 * Check the session is in the right state. 1071 * It needs to be in PPPOE_SOFFER 1072 * or PPPOE_NEWCONNECTED. If the latter, 1073 * then this is a retry by the client. 1074 * so be nice, and resend. 1075 */ 1076 sp = sendhook->private; 1077 if (sp->state == PPPOE_NEWCONNECTED) { 1078 /* 1079 * Whoa! drop back to resend that 1080 * PADS packet. 1081 * We should still have a copy of it. 1082 */ 1083 sp->state = PPPOE_SOFFER; 1084 } 1085 if (sp->state != PPPOE_SOFFER) { 1086 LEAVE (ENETUNREACH); 1087 break; 1088 } 1089 neg = sp->neg; 1090 callout_stop(&neg->timeout_ch); 1091 neg->pkt->pkt_header.ph.code = PADS_CODE; 1092 if (sp->Session_ID == 0) 1093 neg->pkt->pkt_header.ph.sid = 1094 htons(sp->Session_ID 1095 = get_new_sid(node)); 1096 send_sessionid(sp); 1097 neg->timeout = 0; 1098 /* 1099 * start working out the tags to respond with. 1100 */ 1101 init_tags(sp); 1102 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1103 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1104 insert_tag(sp, tag);/* return service */ 1105 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1106 insert_tag(sp, tag); /* return it */ 1107 insert_tag(sp, utag); /* ac_cookie */ 1108 scan_tags(sp, ph); 1109 make_packet(sp); 1110 sp->state = PPPOE_NEWCONNECTED; 1111 sendpacket(sp); 1112 /* 1113 * Having sent the last Negotiation header, 1114 * Set up the stored packet header to 1115 * be correct for the actual session. 1116 * But keep the negotialtion stuff 1117 * around in case we need to resend this last 1118 * packet. We'll discard it when we move 1119 * from NEWCONNECTED to CONNECTED 1120 */ 1121 sp->pkt_hdr = neg->pkt->pkt_header; 1122 if (pppoe_mode == PPPOE_NONSTANDARD) 1123 sp->pkt_hdr.eh.ether_type 1124 = ETHERTYPE_PPPOE_STUPID_SESS; 1125 else 1126 sp->pkt_hdr.eh.ether_type 1127 = ETHERTYPE_PPPOE_SESS; 1128 sp->pkt_hdr.ph.code = 0; 1129 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1130 break; 1131 case PADS_CODE: 1132 /* 1133 * We are a client: 1134 * Use the host_uniq tag to find the 1135 * hook this is in response to. 1136 * take the session ID and store it away. 1137 * Also make sure the pre-made header is 1138 * correct and set us into Session mode. 1139 */ 1140 utag = get_tag(ph, PTT_HOST_UNIQ); 1141 if ((utag == NULL) 1142 || (ntohs(utag->tag_len) != sizeof(sp))) { 1143 LEAVE (ENETUNREACH); 1144 break; 1145 } 1146 sendhook = pppoe_finduniq(node, utag); 1147 if (sendhook == NULL) { 1148 LEAVE(ENETUNREACH); 1149 } 1150 1151 /* 1152 * Check the session is in the right state. 1153 * It needs to be in PPPOE_SREQ. 1154 */ 1155 sp = sendhook->private; 1156 if (sp->state != PPPOE_SREQ) { 1157 LEAVE(ENETUNREACH); 1158 } 1159 neg = sp->neg; 1160 callout_stop(&neg->timeout_ch); 1161 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1162 sp->Session_ID = ntohs(wh->ph.sid); 1163 send_sessionid(sp); 1164 neg->timeout = 0; 1165 sp->state = PPPOE_CONNECTED; 1166 /* 1167 * Now we have gone to Connected mode, 1168 * Free all resources needed for 1169 * negotiation. 1170 * Keep a copy of the header we will be using. 1171 */ 1172 sp->pkt_hdr = neg->pkt->pkt_header; 1173 if (pppoe_mode == PPPOE_NONSTANDARD) 1174 sp->pkt_hdr.eh.ether_type 1175 = ETHERTYPE_PPPOE_STUPID_SESS; 1176 else 1177 sp->pkt_hdr.eh.ether_type 1178 = ETHERTYPE_PPPOE_SESS; 1179 sp->pkt_hdr.ph.code = 0; 1180 m_freem(neg->m); 1181 kfree(sp->neg, M_NETGRAPH); 1182 sp->neg = NULL; 1183 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1184 break; 1185 case PADT_CODE: 1186 /* 1187 * Send a 'close' message to the controlling 1188 * process (the one that set us up); 1189 * And then tear everything down. 1190 * 1191 * Find matching peer/session combination. 1192 */ 1193 sendhook = pppoe_findsession(node, wh); 1194 NG_FREE_DATA(m, meta); /* no longer needed */ 1195 if (sendhook == NULL) { 1196 LEAVE(ENETUNREACH); 1197 } 1198 /* send message to creator */ 1199 /* close hook */ 1200 if (sendhook) { 1201 ng_destroy_hook(sendhook); 1202 } 1203 break; 1204 default: 1205 LEAVE(EPFNOSUPPORT); 1206 } 1207 break; 1208 case ETHERTYPE_PPPOE_STUPID_SESS: 1209 case ETHERTYPE_PPPOE_SESS: 1210 /* 1211 * find matching peer/session combination. 1212 */ 1213 sendhook = pppoe_findsession(node, wh); 1214 if (sendhook == NULL) { 1215 LEAVE (ENETUNREACH); 1216 break; 1217 } 1218 sp = sendhook->private; 1219 m_adj(m, sizeof(*wh)); 1220 if (m->m_pkthdr.len < length) { 1221 /* Packet too short, dump it */ 1222 LEAVE(EMSGSIZE); 1223 } 1224 1225 /* Also need to trim excess at the end */ 1226 if (m->m_pkthdr.len > length) { 1227 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1228 } 1229 if ( sp->state != PPPOE_CONNECTED) { 1230 if (sp->state == PPPOE_NEWCONNECTED) { 1231 sp->state = PPPOE_CONNECTED; 1232 /* 1233 * Now we have gone to Connected mode, 1234 * Free all resources needed for 1235 * negotiation. Be paranoid about 1236 * whether there may be a timeout. 1237 */ 1238 m_freem(sp->neg->m); 1239 callout_stop(&sp->neg->timeout_ch); 1240 kfree(sp->neg, M_NETGRAPH); 1241 sp->neg = NULL; 1242 } else { 1243 LEAVE (ENETUNREACH); 1244 break; 1245 } 1246 } 1247 NG_SEND_DATA( error, sendhook, m, meta); 1248 break; 1249 default: 1250 LEAVE(EPFNOSUPPORT); 1251 } 1252 } else { 1253 /* 1254 * Not ethernet or debug hook.. 1255 * 1256 * The packet has come in on a normal hook. 1257 * We need to find out what kind of hook, 1258 * So we can decide how to handle it. 1259 * Check the hook's state. 1260 */ 1261 sp = hook->private; 1262 switch (sp->state) { 1263 case PPPOE_NEWCONNECTED: 1264 case PPPOE_CONNECTED: { 1265 static const u_char addrctrl[] = { 0xff, 0x03 }; 1266 struct pppoe_full_hdr *wh; 1267 1268 /* 1269 * Remove PPP address and control fields, if any. 1270 * For example, ng_ppp(4) always sends LCP packets 1271 * with address and control fields as required by 1272 * generic PPP. PPPoE is an exception to the rule. 1273 */ 1274 if (m->m_pkthdr.len >= 2) { 1275 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1276 LEAVE(ENOBUFS); 1277 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1278 m_adj(m, 2); 1279 } 1280 /* 1281 * Bang in a pre-made header, and set the length up 1282 * to be correct. Then send it to the ethernet driver. 1283 * But first correct the length. 1284 */ 1285 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1286 M_PREPEND(m, sizeof(*wh), M_NOWAIT); 1287 if (m == NULL) { 1288 LEAVE(ENOBUFS); 1289 } 1290 wh = mtod(m, struct pppoe_full_hdr *); 1291 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1292 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1293 privp->packets_out++; 1294 break; 1295 } 1296 case PPPOE_PRIMED: 1297 /* 1298 * A PADI packet is being returned by the application 1299 * that has set up this hook. This indicates that it 1300 * wants us to offer service. 1301 */ 1302 neg = sp->neg; 1303 if (m->m_len < sizeof(*wh)) { 1304 m = m_pullup(m, sizeof(*wh)); 1305 if (m == NULL) { 1306 LEAVE(ENOBUFS); 1307 } 1308 } 1309 wh = mtod(m, struct pppoe_full_hdr *); 1310 ph = &wh->ph; 1311 length = ntohs(wh->ph.length); 1312 code = wh->ph.code; 1313 if ( code != PADI_CODE) { 1314 LEAVE(EINVAL); 1315 } 1316 callout_stop(&neg->timeout_ch); 1317 1318 /* 1319 * This is the first time we hear 1320 * from the client, so note it's 1321 * unicast address, replacing the 1322 * broadcast address. 1323 */ 1324 bcopy(wh->eh.ether_shost, 1325 neg->pkt->pkt_header.eh.ether_dhost, 1326 ETHER_ADDR_LEN); 1327 sp->state = PPPOE_SOFFER; 1328 neg->timeout = 0; 1329 neg->pkt->pkt_header.ph.code = PADO_CODE; 1330 1331 /* 1332 * start working out the tags to respond with. 1333 */ 1334 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1335 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1336 uniqtag.data.pointer = sp; 1337 init_tags(sp); 1338 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1339 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1340 insert_tag(sp, tag); /* return service */ 1341 /* 1342 * If we have a NULL service request 1343 * and have an extra service defined in this hook, 1344 * then also add a tag for the extra service. 1345 * XXX this is a hack. eventually we should be able 1346 * to support advertising many services, not just one 1347 */ 1348 if (((tag == NULL) || (tag->tag_len == 0)) 1349 && (neg->service.hdr.tag_len != 0)) { 1350 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1351 } 1352 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1353 insert_tag(sp, tag); /* returned hostunique */ 1354 insert_tag(sp, &uniqtag.hdr); 1355 scan_tags(sp, ph); 1356 make_packet(sp); 1357 sendpacket(sp); 1358 break; 1359 1360 /* 1361 * Packets coming from the hook make no sense 1362 * to sessions in these states. Throw them away. 1363 */ 1364 case PPPOE_SINIT: 1365 case PPPOE_SREQ: 1366 case PPPOE_SOFFER: 1367 case PPPOE_SNONE: 1368 case PPPOE_LISTENING: 1369 case PPPOE_DEAD: 1370 default: 1371 LEAVE(ENETUNREACH); 1372 } 1373 } 1374 quit: 1375 NG_FREE_DATA(m, meta); 1376 return error; 1377 } 1378 1379 /* 1380 * Do local shutdown processing.. 1381 * If we are a persistant device, we might refuse to go away, and 1382 * we'd only remove our links and reset ourself. 1383 */ 1384 static int 1385 ng_pppoe_rmnode(node_p node) 1386 { 1387 const priv_p privdata = node->private; 1388 1389 AAA 1390 node->flags |= NG_INVALID; 1391 ng_cutlinks(node); 1392 ng_unname(node); 1393 node->private = NULL; 1394 ng_unref(privdata->node); 1395 kfree(privdata, M_NETGRAPH); 1396 return (0); 1397 } 1398 1399 /* 1400 * This is called once we've already connected a new hook to the other node. 1401 * It gives us a chance to balk at the last minute. 1402 */ 1403 static int 1404 ng_pppoe_connect(hook_p hook) 1405 { 1406 /* be really amiable and just say "YUP that's OK by me! " */ 1407 return (0); 1408 } 1409 1410 /* 1411 * Hook disconnection 1412 * 1413 * Clean up all dangling links and information about the session/hook. 1414 * For this type, removal of the last link destroys the node 1415 */ 1416 static int 1417 ng_pppoe_disconnect(hook_p hook) 1418 { 1419 node_p node = hook->node; 1420 priv_p privp = node->private; 1421 sessp sp; 1422 int hooks; 1423 1424 AAA 1425 hooks = node->numhooks; /* this one already not counted */ 1426 if (hook->private == &privp->debug_hook) { 1427 privp->debug_hook = NULL; 1428 } else if (hook->private == &privp->ethernet_hook) { 1429 privp->ethernet_hook = NULL; 1430 ng_rmnode(node); 1431 } else { 1432 sp = hook->private; 1433 if (sp->state != PPPOE_SNONE ) { 1434 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1435 } 1436 /* 1437 * According to the spec, if we are connected, 1438 * we should send a DISC packet if we are shutting down 1439 * a session. 1440 */ 1441 if ((privp->ethernet_hook) 1442 && ((sp->state == PPPOE_CONNECTED) 1443 || (sp->state == PPPOE_NEWCONNECTED))) { 1444 struct mbuf *m; 1445 struct pppoe_full_hdr *wh; 1446 struct pppoe_tag *tag; 1447 int msglen = strlen(SIGNOFF); 1448 void *dummy = NULL; 1449 int error = 0; 1450 1451 /* revert the stored header to DISC/PADT mode */ 1452 wh = &sp->pkt_hdr; 1453 wh->ph.code = PADT_CODE; 1454 if (pppoe_mode == PPPOE_NONSTANDARD) 1455 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1456 else 1457 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1458 1459 /* generate a packet of that type */ 1460 MGETHDR(m, M_NOWAIT, MT_DATA); 1461 if(m == NULL) 1462 kprintf("pppoe: Session out of mbufs\n"); 1463 else { 1464 m->m_pkthdr.rcvif = NULL; 1465 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1466 bcopy((caddr_t)wh, mtod(m, caddr_t), 1467 sizeof(*wh)); 1468 /* 1469 * Add a General error message and adjust 1470 * sizes 1471 */ 1472 wh = mtod(m, struct pppoe_full_hdr *); 1473 tag = wh->ph.tag; 1474 tag->tag_type = PTT_GEN_ERR; 1475 tag->tag_len = htons((u_int16_t)msglen); 1476 strncpy(tag->tag_data, SIGNOFF, msglen); 1477 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1478 msglen); 1479 wh->ph.length = htons(sizeof(*tag) + msglen); 1480 NG_SEND_DATA(error, privp->ethernet_hook, m, 1481 dummy); 1482 } 1483 } 1484 /* 1485 * As long as we have somewhere to store the timeout handle, 1486 * we may have a timeout pending.. get rid of it. 1487 */ 1488 if (sp->neg) { 1489 callout_stop(&sp->neg->timeout_ch); 1490 if (sp->neg->m) 1491 m_freem(sp->neg->m); 1492 kfree(sp->neg, M_NETGRAPH); 1493 } 1494 kfree(sp, M_NETGRAPH); 1495 hook->private = NULL; 1496 /* work out how many session hooks there are */ 1497 /* Node goes away on last session hook removal */ 1498 if (privp->ethernet_hook) hooks -= 1; 1499 if (privp->debug_hook) hooks -= 1; 1500 } 1501 if (node->numhooks == 0) 1502 ng_rmnode(node); 1503 return (0); 1504 } 1505 1506 /* 1507 * timeouts come here. 1508 */ 1509 static void 1510 pppoe_ticker(void *arg) 1511 { 1512 hook_p hook = arg; 1513 sessp sp = hook->private; 1514 negp neg = sp->neg; 1515 int error = 0; 1516 struct mbuf *m0 = NULL; 1517 priv_p privp = hook->node->private; 1518 meta_p dummy = NULL; 1519 1520 crit_enter(); 1521 AAA 1522 switch(sp->state) { 1523 /* 1524 * resend the last packet, using an exponential backoff. 1525 * After a period of time, stop growing the backoff, 1526 * and either leave it, or revert to the start. 1527 */ 1528 case PPPOE_SINIT: 1529 case PPPOE_SREQ: 1530 /* timeouts on these produce resends */ 1531 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1532 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1533 callout_reset(&neg->timeout_ch, neg->timeout * hz, 1534 pppoe_ticker, hook); 1535 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1536 if (sp->state == PPPOE_SREQ) { 1537 /* revert to SINIT mode */ 1538 pppoe_start(sp); 1539 } else { 1540 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1541 } 1542 } 1543 break; 1544 case PPPOE_PRIMED: 1545 case PPPOE_SOFFER: 1546 /* a timeout on these says "give up" */ 1547 ng_destroy_hook(hook); 1548 break; 1549 default: 1550 /* timeouts have no meaning in other states */ 1551 kprintf("pppoe: unexpected timeout\n"); 1552 } 1553 crit_exit(); 1554 } 1555 1556 1557 static void 1558 sendpacket(sessp sp) 1559 { 1560 int error = 0; 1561 struct mbuf *m0 = NULL; 1562 hook_p hook = sp->hook; 1563 negp neg = sp->neg; 1564 priv_p privp = hook->node->private; 1565 meta_p dummy = NULL; 1566 1567 AAA 1568 switch(sp->state) { 1569 case PPPOE_LISTENING: 1570 case PPPOE_DEAD: 1571 case PPPOE_SNONE: 1572 case PPPOE_CONNECTED: 1573 kprintf("pppoe: sendpacket: unexpected state\n"); 1574 break; 1575 1576 case PPPOE_NEWCONNECTED: 1577 /* send the PADS without a timeout - we're now connected */ 1578 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1579 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1580 break; 1581 1582 case PPPOE_PRIMED: 1583 /* No packet to send, but set up the timeout */ 1584 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1585 pppoe_ticker, hook); 1586 break; 1587 1588 case PPPOE_SOFFER: 1589 /* 1590 * send the offer but if they don't respond 1591 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1592 */ 1593 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1594 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1595 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz, 1596 pppoe_ticker, hook); 1597 break; 1598 1599 case PPPOE_SINIT: 1600 case PPPOE_SREQ: 1601 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1602 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1603 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz, 1604 pppoe_ticker, hook); 1605 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1606 break; 1607 1608 default: 1609 error = EINVAL; 1610 kprintf("pppoe: timeout: bad state\n"); 1611 } 1612 /* return (error); */ 1613 } 1614 1615 /* 1616 * Parse an incoming packet to see if any tags should be copied to the 1617 * output packet. Don't do any tags that have been handled in the main 1618 * state machine. 1619 */ 1620 static const struct pppoe_tag* 1621 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1622 { 1623 const char *const end = (const char *)next_tag(ph); 1624 const char *ptn; 1625 const struct pppoe_tag *pt = &ph->tag[0]; 1626 /* 1627 * Keep processing tags while a tag header will still fit. 1628 */ 1629 AAA 1630 while((const char*)(pt + 1) <= end) { 1631 /* 1632 * If the tag data would go past the end of the packet, abort. 1633 */ 1634 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1635 if(ptn > end) 1636 return NULL; 1637 1638 switch (pt->tag_type) { 1639 case PTT_RELAY_SID: 1640 insert_tag(sp, pt); 1641 break; 1642 case PTT_EOL: 1643 return NULL; 1644 case PTT_SRV_NAME: 1645 case PTT_AC_NAME: 1646 case PTT_HOST_UNIQ: 1647 case PTT_AC_COOKIE: 1648 case PTT_VENDOR: 1649 case PTT_SRV_ERR: 1650 case PTT_SYS_ERR: 1651 case PTT_GEN_ERR: 1652 break; 1653 } 1654 pt = (const struct pppoe_tag*)ptn; 1655 } 1656 return NULL; 1657 } 1658 1659 static int 1660 pppoe_send_event(sessp sp, enum cmd cmdid) 1661 { 1662 int error; 1663 struct ng_mesg *msg; 1664 struct ngpppoe_sts *sts; 1665 1666 AAA 1667 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1668 sizeof(struct ngpppoe_sts), M_NOWAIT); 1669 if (msg == NULL) 1670 return (ENOMEM); 1671 sts = (struct ngpppoe_sts *)msg->data; 1672 strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ); 1673 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1674 return (error); 1675 } 1676