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