ng_pppoe.c revision 67506
1124480Sdes 2124480Sdes/* 3124480Sdes * ng_pppoe.c 4124480Sdes * 5124480Sdes * Copyright (c) 1996-1999 Whistle Communications, Inc. 6124480Sdes * All rights reserved. 7124480Sdes * 8124480Sdes * Subject to the following obligations and disclaimer of warranty, use and 9124480Sdes * redistribution of this software, in source or object code forms, with or 10124480Sdes * without modifications are expressly permitted by Whistle Communications; 11124480Sdes * provided, however, that: 12124480Sdes * 1. Any and all reproductions of the source or object code must include the 13124480Sdes * copyright notice above and the following disclaimer of warranties; and 14124480Sdes * 2. No rights are granted, in any manner or form, to use Whistle 15124480Sdes * Communications, Inc. trademarks, including the mark "WHISTLE 16124480Sdes * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17124480Sdes * such appears in the above copyright notice or in the software. 18124480Sdes * 19124480Sdes * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20124480Sdes * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21124480Sdes * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22124480Sdes * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23124480Sdes * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24124480Sdes * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25124480Sdes * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26124480Sdes * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27124480Sdes * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28124480Sdes * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29124480Sdes * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30124480Sdes * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31124480Sdes * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32124480Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33124480Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34124480Sdes * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35124480Sdes * OF SUCH DAMAGE. 36124480Sdes * 37124480Sdes * Author: Julian Elischer <julian@freebsd.org> 38124480Sdes * 39124480Sdes * $FreeBSD: head/sys/netgraph/ng_pppoe.c 67506 2000-10-24 17:32:45Z julian $ 40124480Sdes * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41124480Sdes */ 42124480Sdes#if 0 43124480Sdes#define AAA printf("pppoe: %s\n", __FUNCTION__ ); 44124480Sdes#define BBB printf("-%d-", __LINE__ ); 45124480Sdes#else 46124514Sdes#define AAA 47124480Sdes#define BBB 48124480Sdes#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 <net/ethernet.h> 57 58#include <netgraph/ng_message.h> 59#include <netgraph/netgraph.h> 60#include <netgraph/ng_pppoe.h> 61 62#define SIGNOFF "session closed" 63 64/* 65 * This section contains the netgraph method declarations for the 66 * sample node. These methods define the netgraph 'type'. 67 */ 68 69static ng_constructor_t ng_pppoe_constructor; 70static ng_rcvmsg_t ng_pppoe_rcvmsg; 71static ng_shutdown_t ng_pppoe_rmnode; 72static ng_newhook_t ng_pppoe_newhook; 73static ng_connect_t ng_pppoe_connect; 74static ng_rcvdata_t ng_pppoe_rcvdata; 75static ng_disconnect_t ng_pppoe_disconnect; 76 77/* Netgraph node type descriptor */ 78static struct ng_type typestruct = { 79 NG_VERSION, 80 NG_PPPOE_NODE_TYPE, 81 NULL, 82 ng_pppoe_constructor, 83 ng_pppoe_rcvmsg, 84 ng_pppoe_rmnode, 85 ng_pppoe_newhook, 86 NULL, 87 ng_pppoe_connect, 88 ng_pppoe_rcvdata, 89 ng_pppoe_rcvdata, 90 ng_pppoe_disconnect, 91 NULL 92}; 93NETGRAPH_INIT(pppoe, &typestruct); 94 95/* 96 * States for the session state machine. 97 * These have no meaning if there is no hook attached yet. 98 */ 99enum state { 100 PPPOE_SNONE=0, /* [both] Initial state */ 101 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 102 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 103 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 104 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 105 PPPOE_SREQ, /* [Client] Sent a Request */ 106 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 107 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 108 PPPOE_DEAD /* [Both] */ 109}; 110 111#define NUMTAGS 20 /* number of tags we are set up to work with */ 112 113/* 114 * Information we store for each hook on each node for negotiating the 115 * session. The mbuf and cluster are freed once negotiation has completed. 116 * The whole negotiation block is then discarded. 117 */ 118 119struct sess_neg { 120 struct mbuf *m; /* holds cluster with last sent packet */ 121 union packet *pkt; /* points within the above cluster */ 122 struct callout_handle timeout_handle; /* see timeout(9) */ 123 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 124 u_int numtags; 125 struct pppoe_tag *tags[NUMTAGS]; 126 u_int service_len; 127 u_int ac_name_len; 128 129 struct datatag service; 130 struct datatag ac_name; 131}; 132typedef struct sess_neg *negp; 133 134/* 135 * Session information that is needed after connection. 136 */ 137struct sess_con { 138 hook_p hook; 139 u_int16_t Session_ID; 140 enum state state; 141 char creator[NG_NODELEN + 1]; /* who to notify */ 142 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 143 negp neg; /* used when negotiating */ 144 /*struct sess_con *hash_next;*/ /* not yet used */ 145}; 146typedef struct sess_con *sessp; 147 148/* 149 * Information we store for each node 150 */ 151struct PPPOE { 152 node_p node; /* back pointer to node */ 153 hook_p ethernet_hook; 154 hook_p debug_hook; 155 u_int packets_in; /* packets in from ethernet */ 156 u_int packets_out; /* packets out towards ethernet */ 157 u_int32_t flags; 158 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 159}; 160typedef struct PPPOE *priv_p; 161 162const struct ether_header eh_prototype = 163 {{0xff,0xff,0xff,0xff,0xff,0xff}, 164 {0x00,0x00,0x00,0x00,0x00,0x00}, 165 ETHERTYPE_PPPOE_DISC}; 166 167union uniq { 168 char bytes[sizeof(void *)]; 169 void * pointer; 170 }; 171 172#define LEAVE(x) do { error = x; goto quit; } while(0) 173static void pppoe_start(sessp sp); 174static void sendpacket(sessp sp); 175static void pppoe_ticker(void *arg); 176static struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 177static int pppoe_send_event(sessp sp, enum cmd cmdid); 178 179/************************************************************************* 180 * Some basic utilities from the Linux version with author's permission.* 181 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 182 ************************************************************************/ 183 184/* 185 * Generate a new session id 186 * XXX find out the FreeBSD locking scheme. 187 */ 188static u_int16_t 189get_new_sid(node_p node) 190{ 191 static int pppoe_sid = 10; 192 sessp sp; 193 hook_p hook; 194 u_int16_t val; 195 priv_p privp = node->private; 196 197AAA 198restart: 199 val = pppoe_sid++; 200 /* 201 * Spec says 0xFFFF is reserved. 202 * Also don't use 0x0000 203 */ 204 if (val == 0xffff) { 205 pppoe_sid = 20; 206 goto restart; 207 } 208 209 /* Check it isn't already in use */ 210 LIST_FOREACH(hook, &node->hooks, hooks) { 211 /* don't check special hooks */ 212 if ((hook->private == &privp->debug_hook) 213 || (hook->private == &privp->ethernet_hook)) 214 continue; 215 sp = hook->private; 216 if (sp->Session_ID == val) 217 goto restart; 218 } 219 220 return val; 221} 222 223 224/* 225 * Return the location where the next tag can be put 226 */ 227static __inline struct pppoe_tag* 228next_tag(struct pppoe_hdr* ph) 229{ 230 return (struct pppoe_tag*)(((char*)&ph->tag[0]) + ntohs(ph->length)); 231} 232 233/* 234 * Look for a tag of a specific type 235 * Don't trust any length the other end says. 236 * but assume we already sanity checked ph->length. 237 */ 238static struct pppoe_tag* 239get_tag(struct pppoe_hdr* ph, u_int16_t idx) 240{ 241 char *end = (char *)next_tag(ph); 242 char *ptn; 243 struct pppoe_tag *pt = &ph->tag[0]; 244 /* 245 * Keep processing tags while a tag header will still fit. 246 */ 247AAA 248 while((char*)(pt + 1) <= end) { 249 /* 250 * If the tag data would go past the end of the packet, abort. 251 */ 252 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 253 if(ptn > end) 254 return NULL; 255 256 if(pt->tag_type == idx) 257 return pt; 258 259 pt = (struct pppoe_tag*)ptn; 260 } 261 return NULL; 262} 263 264/************************************************************************** 265 * inlines to initialise or add tags to a session's tag list, 266 **************************************************************************/ 267/* 268 * Initialise the session's tag list 269 */ 270static void 271init_tags(sessp sp) 272{ 273AAA 274 if(sp->neg == NULL) { 275 printf("pppoe: asked to init NULL neg pointer\n"); 276 return; 277 } 278 sp->neg->numtags = 0; 279} 280 281static void 282insert_tag(sessp sp, struct pppoe_tag *tp) 283{ 284 int i; 285 negp neg; 286 287AAA 288 if((neg = sp->neg) == NULL) { 289 printf("pppoe: asked to use NULL neg pointer\n"); 290 return; 291 } 292 if ((i = neg->numtags++) < NUMTAGS) { 293 neg->tags[i] = tp; 294 } else { 295 printf("pppoe: asked to add too many tags to packet\n"); 296 neg->numtags--; 297 } 298} 299 300/* 301 * Make up a packet, using the tags filled out for the session. 302 * 303 * Assume that the actual pppoe header and ethernet header 304 * are filled out externally to this routine. 305 * Also assume that neg->wh points to the correct 306 * location at the front of the buffer space. 307 */ 308static void 309make_packet(sessp sp) { 310 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 311 struct pppoe_tag **tag; 312 char *dp; 313 int count; 314 int tlen; 315 u_int16_t length = 0; 316 317AAA 318 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 319 printf("pppoe: make_packet called from wrong state\n"); 320 } 321 dp = (char *)wh->ph.tag; 322 for (count = 0, tag = sp->neg->tags; 323 ((count < sp->neg->numtags) && (count < NUMTAGS)); 324 tag++, count++) { 325 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 326 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 327 printf("pppoe: tags too long\n"); 328 sp->neg->numtags = count; 329 break; /* XXX chop off what's too long */ 330 } 331 bcopy((char *)*tag, (char *)dp, tlen); 332 length += tlen; 333 dp += tlen; 334 } 335 wh->ph.length = htons(length); 336 sp->neg->m->m_len = length + sizeof(*wh); 337 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 338} 339 340/************************************************************************** 341 * Routine to match a service offered * 342 **************************************************************************/ 343/* 344 * Find a hook that has a service string that matches that 345 * we are seeking. for now use a simple string. 346 * In the future we may need something like regexp(). 347 * for testing allow a null string to match 1st found and a null service 348 * to match all requests. Also make '*' do the same. 349 */ 350static hook_p 351pppoe_match_svc(node_p node, char *svc_name, int svc_len) 352{ 353 sessp sp = NULL; 354 negp neg = NULL; 355 priv_p privp = node->private; 356 hook_p hook; 357 358AAA 359 LIST_FOREACH(hook, &node->hooks, hooks) { 360 361 /* skip any hook that is debug or ethernet */ 362 if ((hook->private == &privp->debug_hook) 363 || (hook->private == &privp->ethernet_hook)) 364 continue; 365 sp = hook->private; 366 367 /* Skip any sessions which are not in LISTEN mode. */ 368 if ( sp->state != PPPOE_LISTENING) 369 continue; 370 371 neg = sp->neg; 372 /* XXX check validity of this */ 373 /* special case, NULL request. match 1st found. */ 374 if (svc_len == 0) 375 break; 376 377 /* XXX check validity of this */ 378 /* Special case for a blank or "*" service name (wildcard) */ 379 if ((neg->service_len == 0) 380 || ((neg->service_len == 1) 381 && (neg->service.data[0] == '*'))) { 382 break; 383 } 384 385 /* If the lengths don't match, that aint it. */ 386 if (neg->service_len != svc_len) 387 continue; 388 389 /* An exact match? */ 390 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 391 break; 392 } 393 return (hook); 394} 395/************************************************************************** 396 * Routine to find a particular session that matches an incoming packet * 397 **************************************************************************/ 398static hook_p 399pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 400{ 401 sessp sp = NULL; 402 hook_p hook = NULL; 403 priv_p privp = node->private; 404 u_int16_t session = ntohs(wh->ph.sid); 405 406 /* 407 * find matching peer/session combination. 408 */ 409AAA 410 LIST_FOREACH(hook, &node->hooks, hooks) { 411 /* don't check special hooks */ 412 if ((hook->private == &privp->debug_hook) 413 || (hook->private == &privp->ethernet_hook)) { 414 continue; 415 } 416 sp = hook->private; 417 if ( ( (sp->state == PPPOE_CONNECTED) 418 || (sp->state == PPPOE_NEWCONNECTED) ) 419 && (sp->Session_ID == session) 420 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 421 wh->eh.ether_shost, 422 ETHER_ADDR_LEN)) == 0) { 423 break; 424 } 425 } 426 return (hook); 427} 428 429static hook_p 430pppoe_finduniq(node_p node, struct pppoe_tag *tag) 431{ 432 hook_p hook = NULL; 433 priv_p privp = node->private; 434 union uniq uniq; 435 436AAA 437 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 438 /* cycle through all known hooks */ 439 LIST_FOREACH(hook, &node->hooks, hooks) { 440 /* don't check special hooks */ 441 if ((hook->private == &privp->debug_hook) 442 || (hook->private == &privp->ethernet_hook)) 443 continue; 444 if (uniq.pointer == hook->private) 445 break; 446 } 447 return (hook); 448} 449 450/************************************************************************** 451 * start of Netgraph entrypoints * 452 **************************************************************************/ 453 454/* 455 * Allocate the private data structure and the generic node 456 * and link them together. 457 * 458 * ng_make_node_common() returns with a generic node struct 459 * with a single reference for us.. we transfer it to the 460 * private structure.. when we free the private struct we must 461 * unref the node so it gets freed too. 462 * 463 * If this were a device node than this work would be done in the attach() 464 * routine and the constructor would return EINVAL as you should not be able 465 * to creatednodes that depend on hardware (unless you can add the hardware :) 466 */ 467static int 468ng_pppoe_constructor(node_p *nodep) 469{ 470 priv_p privdata; 471 int error; 472 473AAA 474 /* Initialize private descriptor */ 475 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, M_NOWAIT); 476 if (privdata == NULL) 477 return (ENOMEM); 478 bzero(privdata, sizeof(*privdata)); 479 480 /* Call the 'generic' (ie, superclass) node constructor */ 481 if ((error = ng_make_node_common(&typestruct, nodep))) { 482 FREE(privdata, M_NETGRAPH); 483 return (error); 484 } 485 486 /* Link structs together; this counts as our one reference to *nodep */ 487 (*nodep)->private = privdata; 488 privdata->node = *nodep; 489 return (0); 490} 491 492/* 493 * Give our ok for a hook to be added... 494 * point the hook's private info to the hook structure. 495 * 496 * The following hook names are special: 497 * Ethernet: the hook that should be connected to a NIC. 498 * debug: copies of data sent out here (when I write the code). 499 */ 500static int 501ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 502{ 503 const priv_p privp = node->private; 504 sessp sp; 505 506AAA 507 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 508 privp->ethernet_hook = hook; 509 hook->private = &privp->ethernet_hook; 510 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 511 privp->debug_hook = hook; 512 hook->private = &privp->debug_hook; 513 } else { 514 /* 515 * Any other unique name is OK. 516 * The infrastructure has already checked that it's unique, 517 * so just allocate it and hook it in. 518 */ 519 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT); 520 if (sp == NULL) { 521 return (ENOMEM); 522 } 523 bzero(sp, sizeof(*sp)); 524 525 hook->private = sp; 526 sp->hook = hook; 527 } 528 return(0); 529} 530 531/* 532 * Get a netgraph control message. 533 * Check it is one we understand. If needed, send a response. 534 * We sometimes save the address for an async action later. 535 * Always free the message. 536 */ 537static int 538ng_pppoe_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 539 struct ng_mesg **rptr, hook_p lasthook) 540{ 541 priv_p privp = node->private; 542 struct ngpppoe_init_data *ourmsg = NULL; 543 struct ng_mesg *resp = NULL; 544 int error = 0; 545 hook_p hook = NULL; 546 sessp sp = NULL; 547 negp neg = NULL; 548 549AAA 550 /* Deal with message according to cookie and command */ 551 switch (msg->header.typecookie) { 552 case NGM_PPPOE_COOKIE: 553 switch (msg->header.cmd) { 554 case NGM_PPPOE_CONNECT: 555 case NGM_PPPOE_LISTEN: 556 case NGM_PPPOE_OFFER: 557 ourmsg = (struct ngpppoe_init_data *)msg->data; 558 if (( sizeof(*ourmsg) > msg->header.arglen) 559 || ((sizeof(*ourmsg) + ourmsg->data_len) 560 > msg->header.arglen)) { 561 printf("pppoe_rcvmsg: bad arg size"); 562 LEAVE(EMSGSIZE); 563 } 564 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 565 printf("pppoe: init data too long (%d)\n", 566 ourmsg->data_len); 567 LEAVE(EMSGSIZE); 568 } 569 /* make sure strcmp will terminate safely */ 570 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 571 572 /* cycle through all known hooks */ 573 LIST_FOREACH(hook, &node->hooks, hooks) { 574 if (hook->name 575 && strcmp(hook->name, ourmsg->hook) == 0) 576 break; 577 } 578 if (hook == NULL) { 579 LEAVE(ENOENT); 580 } 581 if ((hook->private == &privp->debug_hook) 582 || (hook->private == &privp->ethernet_hook)) { 583 LEAVE(EINVAL); 584 } 585 sp = hook->private; 586 if (sp->state |= PPPOE_SNONE) { 587 printf("pppoe: Session already active\n"); 588 LEAVE(EISCONN); 589 } 590 591 /* 592 * set up prototype header 593 */ 594 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, M_NOWAIT); 595 596 if (neg == NULL) { 597 printf("pppoe: Session out of memory\n"); 598 LEAVE(ENOMEM); 599 } 600 bzero(neg, sizeof(*neg)); 601 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 602 if(neg->m == NULL) { 603 printf("pppoe: Session out of mbufs\n"); 604 FREE(neg, M_NETGRAPH); 605 LEAVE(ENOBUFS); 606 } 607 neg->m->m_pkthdr.rcvif = NULL; 608 MCLGET(neg->m, M_DONTWAIT); 609 if ((neg->m->m_flags & M_EXT) == 0) { 610 printf("pppoe: Session out of mcls\n"); 611 m_freem(neg->m); 612 FREE(neg, M_NETGRAPH); 613 LEAVE(ENOBUFS); 614 } 615 sp->neg = neg; 616 callout_handle_init( &neg->timeout_handle); 617 neg->m->m_len = sizeof(struct pppoe_full_hdr); 618 neg->pkt = mtod(neg->m, union packet*); 619 neg->pkt->pkt_header.eh = eh_prototype; 620 neg->pkt->pkt_header.ph.ver = 0x1; 621 neg->pkt->pkt_header.ph.type = 0x1; 622 neg->pkt->pkt_header.ph.sid = 0x0000; 623 neg->timeout = 0; 624 625 strncpy(sp->creator, retaddr, NG_NODELEN); 626 sp->creator[NG_NODELEN] = '\0'; 627 } 628 switch (msg->header.cmd) { 629 case NGM_PPPOE_GET_STATUS: 630 { 631 struct ngpppoestat *stats; 632 633 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 634 if (!resp) { 635 LEAVE(ENOMEM); 636 } 637 stats = (struct ngpppoestat *) resp->data; 638 stats->packets_in = privp->packets_in; 639 stats->packets_out = privp->packets_out; 640 break; 641 } 642 case NGM_PPPOE_CONNECT: 643 /* 644 * Check the hook exists and is Uninitialised. 645 * Send a PADI request, and start the timeout logic. 646 * Store the originator of this message so we can send 647 * a success of fail message to them later. 648 * Move the session to SINIT 649 * Set up the session to the correct state and 650 * start it. 651 */ 652 neg->service.hdr.tag_type = PTT_SRV_NAME; 653 neg->service.hdr.tag_len = 654 htons((u_int16_t)ourmsg->data_len); 655 if (ourmsg->data_len) { 656 bcopy(ourmsg->data, 657 neg->service.data, ourmsg->data_len); 658 } 659 neg->service_len = ourmsg->data_len; 660 pppoe_start(sp); 661 break; 662 case NGM_PPPOE_LISTEN: 663 /* 664 * Check the hook exists and is Uninitialised. 665 * Install the service matching string. 666 * Store the originator of this message so we can send 667 * a success of fail message to them later. 668 * Move the hook to 'LISTENING' 669 670 */ 671 neg->service.hdr.tag_type = PTT_SRV_NAME; 672 neg->service.hdr.tag_len = 673 htons((u_int16_t)ourmsg->data_len); 674 675 if (ourmsg->data_len) { 676 bcopy(ourmsg->data, 677 neg->service.data, ourmsg->data_len); 678 } 679 neg->service_len = ourmsg->data_len; 680 neg->pkt->pkt_header.ph.code = PADT_CODE; 681 /* 682 * wait for PADI packet coming from ethernet 683 */ 684 sp->state = PPPOE_LISTENING; 685 break; 686 case NGM_PPPOE_OFFER: 687 /* 688 * Check the hook exists and is Uninitialised. 689 * Store the originator of this message so we can send 690 * a success of fail message to them later. 691 * Store the AC-Name given and go to PRIMED. 692 */ 693 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 694 neg->ac_name.hdr.tag_len = 695 htons((u_int16_t)ourmsg->data_len); 696 if (ourmsg->data_len) { 697 bcopy(ourmsg->data, 698 neg->ac_name.data, ourmsg->data_len); 699 } 700 neg->ac_name_len = ourmsg->data_len; 701 neg->pkt->pkt_header.ph.code = PADO_CODE; 702 /* 703 * Wait for PADI packet coming from hook 704 */ 705 sp->state = PPPOE_PRIMED; 706 break; 707 default: 708 LEAVE(EINVAL); 709 } 710 break; 711 default: 712 LEAVE(EINVAL); 713 } 714 715 /* Take care of synchronous response, if any */ 716 if (rptr) 717 *rptr = resp; 718 else if (resp) 719 FREE(resp, M_NETGRAPH); 720 721 /* Free the message and return */ 722quit: 723 FREE(msg, M_NETGRAPH); 724 return(error); 725} 726 727/* 728 * Start a client into the first state. A separate function because 729 * it can be needed if the negotiation times out. 730 */ 731static void 732pppoe_start(sessp sp) 733{ 734 struct { 735 struct pppoe_tag hdr; 736 union uniq data; 737 } uniqtag; 738 739 /* 740 * kick the state machine into starting up 741 */ 742AAA 743 sp->state = PPPOE_SINIT; 744 /* reset the packet header to broadcast */ 745 sp->neg->pkt->pkt_header.eh = eh_prototype; 746 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 747 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 748 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 749 uniqtag.data.pointer = sp; 750 init_tags(sp); 751 insert_tag(sp, &sp->neg->service.hdr); 752 insert_tag(sp, &uniqtag.hdr); 753 make_packet(sp); 754 sendpacket(sp); 755} 756 757/* 758 * Receive data, and do something with it. 759 * The caller will never free m or meta, so 760 * if we use up this data or abort we must free BOTH of these. 761 */ 762static int 763ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, 764 struct mbuf **ret_m, meta_p *ret_meta) 765{ 766 node_p node = hook->node; 767 const priv_p privp = node->private; 768 sessp sp = hook->private; 769 struct pppoe_full_hdr *wh; 770 struct pppoe_hdr *ph; 771 int error = 0; 772 u_int16_t session; 773 u_int16_t length; 774 u_int8_t code; 775 struct pppoe_tag *utag = NULL, *tag = NULL; 776 hook_p sendhook; 777 struct { 778 struct pppoe_tag hdr; 779 union uniq data; 780 } uniqtag; 781 negp neg = NULL; 782 783AAA 784 if (hook->private == &privp->debug_hook) { 785 /* 786 * Data from the debug hook gets sent without modification 787 * straight to the ethernet. 788 */ 789 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 790 privp->packets_out++; 791 } else if (hook->private == &privp->ethernet_hook) { 792 /* 793 * Incoming data. 794 * Dig out various fields from the packet. 795 * use them to decide where to send it. 796 */ 797 798 privp->packets_in++; 799 if( m->m_len < sizeof(*wh)) { 800 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 801 if (m == NULL) { 802 printf("couldn't m_pullup\n"); 803 LEAVE(ENOBUFS); 804 } 805 } 806 wh = mtod(m, struct pppoe_full_hdr *); 807 ph = &wh->ph; 808 session = ntohs(wh->ph.sid); 809 length = ntohs(wh->ph.length); 810 code = wh->ph.code; 811 switch(wh->eh.ether_type) { 812 case ETHERTYPE_PPPOE_DISC: 813 /* 814 * We need to try to make sure that the tag area 815 * is contiguous, or we could wander off the end 816 * of a buffer and make a mess. 817 * (Linux wouldn't have this problem). 818 */ 819/*XXX fix this mess */ 820 821 if (m->m_pkthdr.len <= MHLEN) { 822 if( m->m_len < m->m_pkthdr.len) { 823 m = m_pullup(m, m->m_pkthdr.len); 824 if (m == NULL) { 825 printf("couldn't m_pullup\n"); 826 LEAVE(ENOBUFS); 827 } 828 } 829 } 830 if (m->m_len != m->m_pkthdr.len) { 831 /* 832 * It's not all in one piece. 833 * We need to do extra work. 834 */ 835 printf("packet fragmented\n"); 836 LEAVE(EMSGSIZE); 837 } 838 839 switch(code) { 840 case PADI_CODE: 841 /* 842 * We are a server: 843 * Look for a hook with the required service 844 * and send the ENTIRE packet up there. 845 * It should come back to a new hook in 846 * PRIMED state. Look there for further 847 * processing. 848 */ 849 tag = get_tag(ph, PTT_SRV_NAME); 850 if (tag == NULL) { 851 printf("no service tag\n"); 852 LEAVE(ENETUNREACH); 853 } 854 sendhook = pppoe_match_svc(hook->node, 855 tag->tag_data, ntohs(tag->tag_len)); 856 if (sendhook) { 857 NG_SEND_DATA(error, sendhook, m, meta); 858 } else { 859 printf("no such service\n"); 860 LEAVE(ENETUNREACH); 861 } 862 break; 863 case PADO_CODE: 864 /* 865 * We are a client: 866 * Use the host_uniq tag to find the 867 * hook this is in response to. 868 * Received #2, now send #3 869 * For now simply accept the first we receive. 870 */ 871 utag = get_tag(ph, PTT_HOST_UNIQ); 872 if ((utag == NULL) 873 || (ntohs(utag->tag_len) != sizeof(sp))) { 874 printf("no host unique field\n"); 875 LEAVE(ENETUNREACH); 876 } 877 878 sendhook = pppoe_finduniq(node, utag); 879 if (sendhook == NULL) { 880 printf("no matching session\n"); 881 LEAVE(ENETUNREACH); 882 } 883 884 /* 885 * Check the session is in the right state. 886 * It needs to be in PPPOE_SINIT. 887 */ 888 sp = sendhook->private; 889 if (sp->state != PPPOE_SINIT) { 890 printf("session in wrong state\n"); 891 LEAVE(ENETUNREACH); 892 } 893 neg = sp->neg; 894 untimeout(pppoe_ticker, sendhook, 895 neg->timeout_handle); 896 897 /* 898 * This is the first time we hear 899 * from the server, so note it's 900 * unicast address, replacing the 901 * broadcast address . 902 */ 903 bcopy(wh->eh.ether_shost, 904 neg->pkt->pkt_header.eh.ether_dhost, 905 ETHER_ADDR_LEN); 906 neg->timeout = 0; 907 neg->pkt->pkt_header.ph.code = PADR_CODE; 908 init_tags(sp); 909 insert_tag(sp, &neg->service.hdr); /* Service */ 910 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 911 insert_tag(sp, tag); /* return cookie */ 912 if ((tag = get_tag(ph, PTT_AC_NAME))) 913 insert_tag(sp, tag); /* return it */ 914 insert_tag(sp, utag); /* Host Unique */ 915 scan_tags(sp, ph); 916 make_packet(sp); 917 sp->state = PPPOE_SREQ; 918 sendpacket(sp); 919 break; 920 case PADR_CODE: 921 922 /* 923 * We are a server: 924 * Use the ac_cookie tag to find the 925 * hook this is in response to. 926 */ 927 utag = get_tag(ph, PTT_AC_COOKIE); 928 if ((utag == NULL) 929 || (ntohs(utag->tag_len) != sizeof(sp))) { 930 LEAVE(ENETUNREACH); 931 } 932 933 sendhook = pppoe_finduniq(node, utag); 934 if (sendhook == NULL) { 935 LEAVE(ENETUNREACH); 936 } 937 938 /* 939 * Check the session is in the right state. 940 * It needs to be in PPPOE_SOFFER 941 * or PPPOE_NEWCONNECTED. If the latter, 942 * then this is a retry by the client. 943 * so be nice, and resend. 944 */ 945 sp = sendhook->private; 946 if (sp->state == PPPOE_NEWCONNECTED) { 947 /* 948 * Whoa! drop back to resend that 949 * PADS packet. 950 * We should still have a copy of it. 951 */ 952 sp->state = PPPOE_SOFFER; 953 } 954 if (sp->state != PPPOE_SOFFER) { 955 LEAVE (ENETUNREACH); 956 break; 957 } 958 neg = sp->neg; 959 untimeout(pppoe_ticker, sendhook, 960 neg->timeout_handle); 961 neg->pkt->pkt_header.ph.code = PADS_CODE; 962 if (sp->Session_ID == 0) 963 neg->pkt->pkt_header.ph.sid = 964 htons(sp->Session_ID 965 = get_new_sid(node)); 966 neg->timeout = 0; 967 /* 968 * start working out the tags to respond with. 969 */ 970 init_tags(sp); 971 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 972 if ((tag = get_tag(ph, PTT_SRV_NAME))) 973 insert_tag(sp, tag);/* return service */ 974 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 975 insert_tag(sp, tag); /* return it */ 976 insert_tag(sp, utag); /* ac_cookie */ 977 scan_tags(sp, ph); 978 make_packet(sp); 979 sp->state = PPPOE_NEWCONNECTED; 980 sendpacket(sp); 981 /* 982 * Having sent the last Negotiation header, 983 * Set up the stored packet header to 984 * be correct for the actual session. 985 * But keep the negotialtion stuff 986 * around in case we need to resend this last 987 * packet. We'll discard it when we move 988 * from NEWCONNECTED to CONNECTED 989 */ 990 sp->pkt_hdr = neg->pkt->pkt_header; 991 sp->pkt_hdr.eh.ether_type 992 = ETHERTYPE_PPPOE_SESS; 993 sp->pkt_hdr.ph.code = 0; 994 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 995 break; 996 case PADS_CODE: 997 /* 998 * We are a client: 999 * Use the host_uniq tag to find the 1000 * hook this is in response to. 1001 * take the session ID and store it away. 1002 * Also make sure the pre-made header is 1003 * correct and set us into Session mode. 1004 */ 1005 utag = get_tag(ph, PTT_HOST_UNIQ); 1006 if ((utag == NULL) 1007 || (ntohs(utag->tag_len) != sizeof(sp))) { 1008 LEAVE (ENETUNREACH); 1009 break; 1010 } 1011 sendhook = pppoe_finduniq(node, utag); 1012 if (sendhook == NULL) { 1013 LEAVE(ENETUNREACH); 1014 } 1015 1016 /* 1017 * Check the session is in the right state. 1018 * It needs to be in PPPOE_SREQ. 1019 */ 1020 sp = sendhook->private; 1021 if (sp->state != PPPOE_SREQ) { 1022 LEAVE(ENETUNREACH); 1023 } 1024 neg = sp->neg; 1025 untimeout(pppoe_ticker, sendhook, 1026 neg->timeout_handle); 1027 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1028 sp->Session_ID = ntohs(wh->ph.sid); 1029 neg->timeout = 0; 1030 sp->state = PPPOE_CONNECTED; 1031 /* 1032 * Now we have gone to Connected mode, 1033 * Free all resources needed for 1034 * negotiation. 1035 * Keep a copy of the header we will be using. 1036 */ 1037 sp->pkt_hdr = neg->pkt->pkt_header; 1038 sp->pkt_hdr.eh.ether_type 1039 = ETHERTYPE_PPPOE_SESS; 1040 sp->pkt_hdr.ph.code = 0; 1041 m_freem(neg->m); 1042 FREE(sp->neg, M_NETGRAPH); 1043 sp->neg = NULL; 1044 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1045 break; 1046 case PADT_CODE: 1047 /* 1048 * Send a 'close' message to the controlling 1049 * process (the one that set us up); 1050 * And then tear everything down. 1051 * 1052 * Find matching peer/session combination. 1053 */ 1054 sendhook = pppoe_findsession(node, wh); 1055 NG_FREE_DATA(m, meta); /* no longer needed */ 1056 if (sendhook == NULL) { 1057 LEAVE(ENETUNREACH); 1058 } 1059 /* send message to creator */ 1060 /* close hook */ 1061 if (sendhook) { 1062 ng_destroy_hook(sendhook); 1063 } 1064 break; 1065 default: 1066 LEAVE(EPFNOSUPPORT); 1067 } 1068 break; 1069 case ETHERTYPE_PPPOE_SESS: 1070 /* 1071 * find matching peer/session combination. 1072 */ 1073 sendhook = pppoe_findsession(node, wh); 1074 if (sendhook == NULL) { 1075 LEAVE (ENETUNREACH); 1076 break; 1077 } 1078 sp = sendhook->private; 1079 m_adj(m, sizeof(*wh)); 1080 if (m->m_pkthdr.len < length) { 1081 /* Packet too short, dump it */ 1082 LEAVE(EMSGSIZE); 1083 } 1084 1085 /* Also need to trim excess at the end */ 1086 if (m->m_pkthdr.len > length) { 1087 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1088 } 1089 if ( sp->state != PPPOE_CONNECTED) { 1090 if (sp->state == PPPOE_NEWCONNECTED) { 1091 sp->state = PPPOE_CONNECTED; 1092 /* 1093 * Now we have gone to Connected mode, 1094 * Free all resources needed for 1095 * negotiation. Be paranoid about 1096 * whether there may be a timeout. 1097 */ 1098 m_freem(sp->neg->m); 1099 untimeout(pppoe_ticker, sendhook, 1100 sp->neg->timeout_handle); 1101 FREE(sp->neg, M_NETGRAPH); 1102 sp->neg = NULL; 1103 } else { 1104 LEAVE (ENETUNREACH); 1105 break; 1106 } 1107 } 1108 NG_SEND_DATA( error, sendhook, m, meta); 1109 break; 1110 default: 1111 LEAVE(EPFNOSUPPORT); 1112 } 1113 } else { 1114 /* 1115 * Not ethernet or debug hook.. 1116 * 1117 * The packet has come in on a normal hook. 1118 * We need to find out what kind of hook, 1119 * So we can decide how to handle it. 1120 * Check the hook's state. 1121 */ 1122 sp = hook->private; 1123 switch (sp->state) { 1124 case PPPOE_NEWCONNECTED: 1125 case PPPOE_CONNECTED: { 1126 static const u_char addrctrl[] = { 0xff, 0x03 }; 1127 struct pppoe_full_hdr *wh; 1128 1129 /* 1130 * Remove PPP address and control fields, if any. 1131 * For example, ng_ppp(4) always sends LCP packets 1132 * with address and control fields as required by 1133 * generic PPP. PPPoE is an exception to the rule. 1134 */ 1135 if (m->m_pkthdr.len >= 2) { 1136 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1137 LEAVE(ENOBUFS); 1138 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1139 m_adj(m, 2); 1140 } 1141 /* 1142 * Bang in a pre-made header, and set the length up 1143 * to be correct. Then send it to the ethernet driver. 1144 * But first correct the length. 1145 */ 1146 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1147 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1148 if (m == NULL) { 1149 LEAVE(ENOBUFS); 1150 } 1151 wh = mtod(m, struct pppoe_full_hdr *); 1152 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1153 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1154 privp->packets_out++; 1155 break; 1156 } 1157 case PPPOE_PRIMED: 1158 /* 1159 * A PADI packet is being returned by the application 1160 * that has set up this hook. This indicates that it 1161 * wants us to offer service. 1162 */ 1163 neg = sp->neg; 1164 if (m->m_len < sizeof(*wh)) { 1165 m = m_pullup(m, sizeof(*wh)); 1166 if (m == NULL) { 1167 LEAVE(ENOBUFS); 1168 } 1169 } 1170 wh = mtod(m, struct pppoe_full_hdr *); 1171 ph = &wh->ph; 1172 session = ntohs(wh->ph.sid); 1173 length = ntohs(wh->ph.length); 1174 code = wh->ph.code; 1175 if ( code != PADI_CODE) { 1176 LEAVE(EINVAL); 1177 }; 1178 untimeout(pppoe_ticker, hook, 1179 neg->timeout_handle); 1180 1181 /* 1182 * This is the first time we hear 1183 * from the client, so note it's 1184 * unicast address, replacing the 1185 * broadcast address. 1186 */ 1187 bcopy(wh->eh.ether_shost, 1188 neg->pkt->pkt_header.eh.ether_dhost, 1189 ETHER_ADDR_LEN); 1190 sp->state = PPPOE_SOFFER; 1191 neg->timeout = 0; 1192 neg->pkt->pkt_header.ph.code = PADO_CODE; 1193 1194 /* 1195 * start working out the tags to respond with. 1196 */ 1197 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1198 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1199 uniqtag.data.pointer = sp; 1200 init_tags(sp); 1201 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1202 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1203 insert_tag(sp, tag); /* return service */ 1204 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1205 insert_tag(sp, tag); /* returned hostunique */ 1206 insert_tag(sp, &uniqtag.hdr); 1207 /* XXX maybe put the tag in the session store */ 1208 scan_tags(sp, ph); 1209 make_packet(sp); 1210 sendpacket(sp); 1211 break; 1212 1213 /* 1214 * Packets coming from the hook make no sense 1215 * to sessions in these states. Throw them away. 1216 */ 1217 case PPPOE_SINIT: 1218 case PPPOE_SREQ: 1219 case PPPOE_SOFFER: 1220 case PPPOE_SNONE: 1221 case PPPOE_LISTENING: 1222 case PPPOE_DEAD: 1223 default: 1224 LEAVE(ENETUNREACH); 1225 } 1226 } 1227quit: 1228 NG_FREE_DATA(m, meta); 1229 return error; 1230} 1231 1232/* 1233 * Do local shutdown processing.. 1234 * If we are a persistant device, we might refuse to go away, and 1235 * we'd only remove our links and reset ourself. 1236 */ 1237static int 1238ng_pppoe_rmnode(node_p node) 1239{ 1240 const priv_p privdata = node->private; 1241 1242AAA 1243 node->flags |= NG_INVALID; 1244 ng_cutlinks(node); 1245 ng_unname(node); 1246 node->private = NULL; 1247 ng_unref(privdata->node); 1248 FREE(privdata, M_NETGRAPH); 1249 return (0); 1250} 1251 1252/* 1253 * This is called once we've already connected a new hook to the other node. 1254 * It gives us a chance to balk at the last minute. 1255 */ 1256static int 1257ng_pppoe_connect(hook_p hook) 1258{ 1259 /* be really amiable and just say "YUP that's OK by me! " */ 1260 return (0); 1261} 1262 1263/* 1264 * Hook disconnection 1265 * 1266 * Clean up all dangling links and information about the session/hook. 1267 * For this type, removal of the last link destroys the node 1268 */ 1269static int 1270ng_pppoe_disconnect(hook_p hook) 1271{ 1272 node_p node = hook->node; 1273 priv_p privp = node->private; 1274 sessp sp; 1275 int hooks; 1276 1277AAA 1278 hooks = node->numhooks; /* this one already not counted */ 1279 if (hook->private == &privp->debug_hook) { 1280 privp->debug_hook = NULL; 1281 } else if (hook->private == &privp->ethernet_hook) { 1282 privp->ethernet_hook = NULL; 1283 ng_rmnode(node); 1284 } else { 1285 sp = hook->private; 1286 if (sp->state != PPPOE_SNONE ) { 1287 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1288 } 1289 /* 1290 * According to the spec, if we are connected, 1291 * we should send a DISC packet if we are shutting down 1292 * a session. 1293 */ 1294 if ((privp->ethernet_hook) 1295 && ((sp->state == PPPOE_CONNECTED) 1296 || (sp->state == PPPOE_NEWCONNECTED))) { 1297 struct mbuf *m; 1298 struct pppoe_full_hdr *wh; 1299 struct pppoe_tag *tag; 1300 int msglen = strlen(SIGNOFF); 1301 void *dummy = NULL; 1302 int error = 0; 1303 1304 /* revert the stored header to DISC/PADT mode */ 1305 wh = &sp->pkt_hdr; 1306 wh->ph.code = PADT_CODE; 1307 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1308 1309 /* generate a packet of that type */ 1310 MGETHDR(m, M_DONTWAIT, MT_DATA); 1311 if(m == NULL) 1312 printf("pppoe: Session out of mbufs\n"); 1313 else { 1314 m->m_pkthdr.rcvif = NULL; 1315 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1316 bcopy((caddr_t)wh, mtod(m, caddr_t), 1317 sizeof(*wh)); 1318 /* 1319 * Add a General error message and adjust 1320 * sizes 1321 */ 1322 wh = mtod(m, struct pppoe_full_hdr *); 1323 tag = wh->ph.tag; 1324 tag->tag_type = PTT_GEN_ERR; 1325 tag->tag_len = htons((u_int16_t)msglen); 1326 strncpy(tag->tag_data, SIGNOFF, msglen); 1327 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1328 msglen); 1329 wh->ph.length = htons(sizeof(*tag) + msglen); 1330 NG_SEND_DATA(error, privp->ethernet_hook, m, 1331 dummy); 1332 } 1333 } 1334 /* 1335 * As long as we have somewhere to store the timeout handle, 1336 * we may have a timeout pending.. get rid of it. 1337 */ 1338 if (sp->neg) { 1339 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1340 if (sp->neg->m) 1341 m_freem(sp->neg->m); 1342 FREE(sp->neg, M_NETGRAPH); 1343 } 1344 FREE(sp, M_NETGRAPH); 1345 hook->private = NULL; 1346 /* work out how many session hooks there are */ 1347 /* Node goes away on last session hook removal */ 1348 if (privp->ethernet_hook) hooks -= 1; 1349 if (privp->debug_hook) hooks -= 1; 1350 } 1351 if (node->numhooks == 0) 1352 ng_rmnode(node); 1353 return (0); 1354} 1355 1356/* 1357 * timeouts come here. 1358 */ 1359static void 1360pppoe_ticker(void *arg) 1361{ 1362 int s = splnet(); 1363 hook_p hook = arg; 1364 sessp sp = hook->private; 1365 negp neg = sp->neg; 1366 int error = 0; 1367 struct mbuf *m0 = NULL; 1368 priv_p privp = hook->node->private; 1369 meta_p dummy = NULL; 1370 1371AAA 1372 switch(sp->state) { 1373 /* 1374 * resend the last packet, using an exponential backoff. 1375 * After a period of time, stop growing the backoff, 1376 * and either leave it, or revert to the start. 1377 */ 1378 case PPPOE_SINIT: 1379 case PPPOE_SREQ: 1380 /* timeouts on these produce resends */ 1381 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1382 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1383 neg->timeout_handle = timeout(pppoe_ticker, 1384 hook, neg->timeout * hz); 1385 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1386 if (sp->state == PPPOE_SREQ) { 1387 /* revert to SINIT mode */ 1388 pppoe_start(sp); 1389 } else { 1390 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1391 } 1392 } 1393 break; 1394 case PPPOE_PRIMED: 1395 case PPPOE_SOFFER: 1396 /* a timeout on these says "give up" */ 1397 ng_destroy_hook(hook); 1398 break; 1399 default: 1400 /* timeouts have no meaning in other states */ 1401 printf("pppoe: unexpected timeout\n"); 1402 } 1403 splx(s); 1404} 1405 1406 1407static void 1408sendpacket(sessp sp) 1409{ 1410 int error = 0; 1411 struct mbuf *m0 = NULL; 1412 hook_p hook = sp->hook; 1413 negp neg = sp->neg; 1414 priv_p privp = hook->node->private; 1415 meta_p dummy = NULL; 1416 1417AAA 1418 switch(sp->state) { 1419 case PPPOE_LISTENING: 1420 case PPPOE_DEAD: 1421 case PPPOE_SNONE: 1422 case PPPOE_CONNECTED: 1423 printf("pppoe: sendpacket: unexpected state\n"); 1424 break; 1425 1426 case PPPOE_NEWCONNECTED: 1427 /* send the PADS without a timeout - we're now connected */ 1428 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1429 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1430 break; 1431 1432 case PPPOE_PRIMED: 1433 /* No packet to send, but set up the timeout */ 1434 neg->timeout_handle = timeout(pppoe_ticker, 1435 hook, PPPOE_OFFER_TIMEOUT * hz); 1436 break; 1437 1438 case PPPOE_SOFFER: 1439 /* 1440 * send the offer but if they don't respond 1441 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1442 */ 1443 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1444 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1445 neg->timeout_handle = timeout(pppoe_ticker, 1446 hook, PPPOE_OFFER_TIMEOUT * hz); 1447 break; 1448 1449 case PPPOE_SINIT: 1450 case PPPOE_SREQ: 1451 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1452 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1453 neg->timeout_handle = timeout(pppoe_ticker, hook, 1454 (hz * PPPOE_INITIAL_TIMEOUT)); 1455 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1456 break; 1457 1458 default: 1459 error = EINVAL; 1460 printf("pppoe: timeout: bad state\n"); 1461 } 1462 /* return (error); */ 1463} 1464 1465/* 1466 * Parse an incoming packet to see if any tags should be copied to the 1467 * output packet. Don't do any tags that have been handled in the main 1468 * state machine. 1469 */ 1470static struct pppoe_tag* 1471scan_tags(sessp sp, struct pppoe_hdr* ph) 1472{ 1473 char *end = (char *)next_tag(ph); 1474 char *ptn; 1475 struct pppoe_tag *pt = &ph->tag[0]; 1476 /* 1477 * Keep processing tags while a tag header will still fit. 1478 */ 1479AAA 1480 while((char*)(pt + 1) <= end) { 1481 /* 1482 * If the tag data would go past the end of the packet, abort. 1483 */ 1484 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1485 if(ptn > end) 1486 return NULL; 1487 1488 switch (pt->tag_type) { 1489 case PTT_RELAY_SID: 1490 insert_tag(sp, pt); 1491 break; 1492 case PTT_EOL: 1493 return NULL; 1494 case PTT_SRV_NAME: 1495 case PTT_AC_NAME: 1496 case PTT_HOST_UNIQ: 1497 case PTT_AC_COOKIE: 1498 case PTT_VENDOR: 1499 case PTT_SRV_ERR: 1500 case PTT_SYS_ERR: 1501 case PTT_GEN_ERR: 1502 break; 1503 } 1504 pt = (struct pppoe_tag*)ptn; 1505 } 1506 return NULL; 1507} 1508 1509static int 1510pppoe_send_event(sessp sp, enum cmd cmdid) 1511{ 1512 int error; 1513 struct ng_mesg *msg; 1514 struct ngpppoe_sts *sts; 1515 1516AAA 1517 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1518 sizeof(struct ngpppoe_sts), M_NOWAIT); 1519 sts = (struct ngpppoe_sts *)msg->data; 1520 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1521 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1522 return (error); 1523} 1524