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