ng_pppoe.c revision 52510
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@whistle.com> 38 * 39 * $FreeBSD: head/sys/netgraph/ng_pppoe.c 52510 1999-10-26 08:08:48Z julian $ 40 * $Whistle: ng_pppoe.c,v 1.7 1999/10/16 10:16:43 julian Exp $ 41 */ 42#if 0 43#define AAA printf("pppoe: %s\n", __FUNCTION__ ); 44#define BBB printf("-%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/syslog.h> 57#include <net/ethernet.h> 58 59#include <netgraph/ng_message.h> 60#include <netgraph/netgraph.h> 61#include <netgraph/ng_pppoe.h> 62 63/* 64 * This section contains the netgraph method declarations for the 65 * sample node. These methods define the netgraph 'type'. 66 */ 67 68static int ng_PPPoE_constructor(node_p *node); 69static int ng_PPPoE_rcvmsg(node_p node, struct ng_mesg *msg, 70 const char *retaddr, struct ng_mesg **resp); 71static int ng_PPPoE_rmnode(node_p node); 72static int ng_PPPoE_newhook(node_p node, hook_p hook, const char *name); 73static int ng_PPPoE_connect(hook_p hook); 74static int ng_PPPoE_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); 75static int ng_PPPoE_disconnect(hook_p hook); 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}; 92NETGRAPH_INIT(PPPoE, &typestruct); 93 94/* 95 * States for the session state machine. 96 * These have no meaning if there is no hook attached yet. 97 */ 98enum state { 99 PPPOE_SNONE=0, /* [both] Initial state */ 100 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 101 PPPOE_PRIMED, /* [Server] Sent offer message */ 102 PPPOE_SOFFER, /* [Server] Sent offer message */ 103 PPPOE_SREQ, /* [Client] Sent a Request */ 104 PPPOE_LISTENING, /* [Server] Listening for discover initiation msg */ 105 PPPOE_NEWCONNECTED, /* [Both] Connection established, No data received */ 106 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 107 PPPOE_DEAD /* [Both] */ 108}; 109 110#define NUMTAGS 20 /* number of tags we are set up to work with */ 111 112/* 113 * Information we store for each hook on each node for negotiating the 114 * session. The mbuf and cluster are freed once negotiation has completed. 115 * The whole negotiation block is then discarded. 116 */ 117 118struct sess_neg { 119 struct mbuf *m; /* holds cluster with last sent packet */ 120 union packet *pkt; /* points within the above cluster */ 121 struct callout_handle timeout_handle; /* see timeout(9) */ 122 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 123 u_int numtags; 124 struct pppoe_tag *tags[NUMTAGS]; 125 u_int service_len; 126 u_int ac_name_len; 127 128 struct datatag service; 129 struct datatag ac_name; 130}; 131typedef struct sess_neg *negp; 132 133/* 134 * Session information that is needed after connection. 135 */ 136struct session { 137 hook_p hook; 138 u_int16_t Session_ID; 139 struct session *hash_next; /* not yet uesed */ 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}; 145typedef struct session *sessp; 146 147/* 148 * Information we store for each node 149 */ 150struct PPPOE { 151 node_p node; /* back pointer to node */ 152 hook_p ethernet_hook; 153 hook_p debug_hook; 154 u_int packets_in; /* packets in from ethernet */ 155 u_int packets_out; /* packets out towards ethernet */ 156 u_int32_t flags; 157 /*struct session *buckets[HASH_SIZE];*/ /* not yet used */ 158}; 159typedef struct PPPOE *priv_p; 160 161const struct ether_header eh_prototype = 162 {{0xff,0xff,0xff,0xff,0xff,0xff}, 163 {0x00,0x00,0x00,0x00,0x00,0x00}, 164 ETHERTYPE_PPPOE_DISC}; 165 166union uniq { 167 char bytes[sizeof(void *)]; 168 void * pointer; 169 }; 170 171#define LEAVE(x) do { error = x; goto quit; } while(0) 172static void pppoe_start(sessp sp); 173static void sendpacket(sessp sp); 174static void pppoe_ticker(void *arg); 175static struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 176static int pppoe_send_event(sessp sp, enum cmd cmdid); 177 178/************************************************************************* 179 * Some basic utilities from the Linux version with author's permission.* 180 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 181 ************************************************************************/ 182 183/* 184 * Generate a new session id 185 * XXX find out the freeBSD locking scheme. 186 */ 187static u_int16_t 188get_new_sid(node_p node) 189{ 190 static int pppoe_sid = 10; 191 sessp sp; 192 hook_p hook; 193 u_int16_t val; 194 priv_p privp = node->private; 195 196AAA 197restart: 198 val = pppoe_sid++; 199 /* 200 * Spec says 0xFFFF is reserved. 201 * Also don't use 0x0000 202 */ 203 if (val == 0xffff) { 204 pppoe_sid = 20; 205 goto restart; 206 } 207 208 /* Check it isn't already in use */ 209 LIST_FOREACH(hook, &node->hooks, hooks) { 210 /* don't check special hooks */ 211 if ((hook->private == &privp->debug_hook) 212 || (hook->private == &privp->ethernet_hook)) 213 continue; 214 sp = hook->private; 215 if (sp->Session_ID == val) 216 goto restart; 217 } 218 219 return val; 220} 221 222 223/* 224 * Return the location where the next tag can be put 225 */ 226static __inline struct pppoe_tag* 227next_tag(struct pppoe_hdr* ph) 228{ 229 return (struct pppoe_tag*)(((char*)&ph->tag[0]) + ntohs(ph->length)); 230} 231 232/* 233 * Look for a tag of a specific type 234 * Don't trust any length the other end says. 235 * but assume we already sanity checked ph->length. 236 */ 237static struct pppoe_tag* 238get_tag(struct pppoe_hdr* ph, u_int16_t idx) 239{ 240 char *end = (char *)next_tag(ph); 241 char *ptn; 242 struct pppoe_tag *pt = &ph->tag[0]; 243 /* 244 * Keep processing tags while a tag header will still fit. 245 */ 246AAA 247 while((char*)(pt + 1) <= end) { 248 /* 249 * If the tag data would go past the end of the packet, abort. 250 */ 251 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 252 if(ptn > end) 253 return NULL; 254 255 if(pt->tag_type == idx) 256 return pt; 257 258 pt = (struct pppoe_tag*)ptn; 259 } 260 return NULL; 261} 262 263/************************************************************************** 264 * inlines to initialise or add tags to a session's tag list, 265 **************************************************************************/ 266/* 267 * Initialise the session's tag list 268 */ 269static void 270init_tags(sessp sp) 271{ 272AAA 273 if(sp->neg == NULL) { 274 printf("pppoe: asked to init NULL neg pointer\n"); 275 return; 276 } 277 sp->neg->numtags = 0; 278} 279 280static void 281insert_tag(sessp sp, struct pppoe_tag *tp) 282{ 283 int i; 284 negp neg; 285 286AAA 287 if((neg = sp->neg) == NULL) { 288 printf("pppoe: asked to use NULL neg pointer\n"); 289 return; 290 } 291 if ((i = neg->numtags++) < NUMTAGS) { 292 neg->tags[i] = tp; 293 } else { 294 printf("pppoe: asked to add too many tags to packet\n"); 295 } 296} 297 298/* 299 * Make up a packet, using the tags filled out for the session. 300 * 301 * Assume that the actual pppoe header and ethernet header 302 * are filled out externally to this routine. 303 * Also assume that neg->wh points to the correct 304 * location at the front of the buffer space. 305 */ 306static void 307make_packet(sessp sp) { 308 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 309 struct pppoe_tag **tag; 310 char *dp; 311 int count; 312 int tlen; 313 u_int16_t length = 0; 314 315AAA 316 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 317 printf("pppoe: make_packet called from wrong state\n"); 318 } 319 dp = (char *)wh->ph.tag; 320 for (count = 0, tag = sp->neg->tags; 321 ((count < sp->neg->numtags) && (count < NUMTAGS)); 322 tag++, count++) { 323 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 324 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 325 printf("pppoe: tags too long\n"); 326 sp->neg->numtags = count; 327 break; /* XXX chop off what's too long */ 328 } 329 bcopy((char *)*tag, (char *)dp, tlen); 330 length += tlen; 331 dp += tlen; 332 } 333 wh->ph.length = htons(length); 334 sp->neg->m->m_len = length + sizeof(*wh); 335 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 336} 337 338/************************************************************************** 339 * Routine to match a service offered * 340 **************************************************************************/ 341/* 342 * Find a hook that has a service string that matches that 343 * we are seeking. for now use a simple string. 344 * In the future we may need something like regexp(). 345 * for testing allow a null string to match 1st found and a null service 346 * to match all requests. Also make '*' do the same. 347 */ 348static hook_p 349pppoe_match_svc(node_p node, char *svc_name, int svc_len) 350{ 351 sessp sp = NULL; 352 negp neg = NULL; 353 priv_p privp = node->private; 354 hook_p hook; 355 356AAA 357 LIST_FOREACH(hook, &node->hooks, hooks) { 358 359 /* skip any hook that is debug or ethernet */ 360 if ((hook->private == &privp->debug_hook) 361 || (hook->private == &privp->ethernet_hook)) 362 continue; 363 sp = hook->private; 364 365 /* Skip any sessions which are not in LISTEN mode. */ 366 if ( sp->state != PPPOE_LISTENING) 367 continue; 368 369 neg = sp->neg; 370 /* XXX check validity of this */ 371 /* special case, NULL request. match 1st found. */ 372 if (svc_len == 0) 373 break; 374 375 /* XXX check validity of this */ 376 /* Special case for a blank or "*" service name (wildcard) */ 377 if ((neg->service_len == 0) 378 || ((neg->service_len == 1) 379 && (neg->service.data[0] == '*'))) { 380 break; 381 } 382 383 /* If the lengths don't match, that aint it. */ 384 if (neg->service_len != svc_len) 385 continue; 386 387 /* An exact match? */ 388 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 389 break; 390 } 391 return (hook); 392} 393/************************************************************************** 394 * Routine to find a particular session that matches an incoming packet * 395 **************************************************************************/ 396static hook_p 397pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 398{ 399 sessp sp = NULL; 400 hook_p hook = NULL; 401 priv_p privp = node->private; 402 u_int16_t session = ntohs(wh->ph.sid); 403 404 /* 405 * find matching peer/session combination. 406 */ 407AAA 408 LIST_FOREACH(hook, &node->hooks, hooks) { 409 /* don't check special hooks */ 410 if ((hook->private == &privp->debug_hook) 411 || (hook->private == &privp->ethernet_hook)) { 412 continue; 413 } 414 sp = hook->private; 415 if ( ( (sp->state == PPPOE_CONNECTED) 416 || (sp->state == PPPOE_NEWCONNECTED) ) 417 && (sp->Session_ID == session) 418 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 419 wh->eh.ether_shost, 420 ETHER_ADDR_LEN)) == 0) { 421 break; 422 } 423 } 424 return (hook); 425} 426 427static hook_p 428pppoe_finduniq(node_p node, struct pppoe_tag *tag) 429{ 430 hook_p hook = NULL; 431 priv_p privp = node->private; 432 union uniq uniq; 433 434AAA 435 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 436 /* cycle through all known hooks */ 437 LIST_FOREACH(hook, &node->hooks, hooks) { 438 /* don't check special hooks */ 439 if ((hook->private == &privp->debug_hook) 440 || (hook->private == &privp->ethernet_hook)) 441 continue; 442 if (uniq.pointer == hook->private) 443 break; 444 } 445 return (hook); 446} 447 448/************************************************************************** 449 * start of Netgraph entrypoints * 450 **************************************************************************/ 451 452/* 453 * Allocate the private data structure and the generic node 454 * and link them together. 455 * 456 * ng_make_node_common() returns with a generic node struct 457 * with a single reference for us.. we transfer it to the 458 * private structure.. when we free the private struct we must 459 * unref the node so it gets freed too. 460 * 461 * If this were a device node than this work would be done in the attach() 462 * routine and the constructor would return EINVAL as you should not be able 463 * to creatednodes that depend on hardware (unless you can add the hardware :) 464 */ 465static int 466ng_PPPoE_constructor(node_p *nodep) 467{ 468 priv_p privdata; 469 int error; 470 471AAA 472 /* Initialize private descriptor */ 473 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, M_WAITOK); 474 if (privdata == NULL) 475 return (ENOMEM); 476 bzero(privdata, sizeof(*privdata)); 477 478 /* Call the 'generic' (ie, superclass) node constructor */ 479 if ((error = ng_make_node_common(&typestruct, nodep))) { 480 FREE(privdata, M_NETGRAPH); 481 return (error); 482 } 483 484 /* Link structs together; this counts as our one reference to *nodep */ 485 (*nodep)->private = privdata; 486 privdata->node = *nodep; 487 return (0); 488} 489 490/* 491 * Give our ok for a hook to be added... 492 * point the hook's private info to the hook structure. 493 * 494 * The following hook names are special: 495 * Ethernet: the hook that should be connected to a NIC. 496 * debug: copies of data sent out here (when I write the code). 497 */ 498static int 499ng_PPPoE_newhook(node_p node, hook_p hook, const char *name) 500{ 501 const priv_p privp = node->private; 502 sessp sp; 503 504AAA 505 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 506 privp->ethernet_hook = hook; 507 hook->private = &privp->ethernet_hook; 508 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 509 privp->debug_hook = hook; 510 hook->private = &privp->debug_hook; 511 } else { 512 /* 513 * Any other unique name is OK. 514 * The infrastructure has already checked that it's unique, 515 * so just allocate it and hook it in. 516 */ 517 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_WAITOK); 518 if (sp == NULL) { 519 return (ENOMEM); 520 } 521 bzero(sp, sizeof(*sp)); 522 523 hook->private = sp; 524 sp->hook = hook; 525 } 526 return(0); 527} 528 529/* 530 * Get a netgraph control message. 531 * Check it is one we understand. If needed, send a response. 532 * We sometimes save the address for an async action later. 533 * Always free the message. 534 */ 535static int 536ng_PPPoE_rcvmsg(node_p node, 537 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 538{ 539 priv_p privp = node->private; 540 struct ngPPPoE_init_data *ourmsg = NULL; 541 struct ng_mesg *resp = NULL; 542 int error = 0; 543 hook_p hook = NULL; 544 sessp sp = NULL; 545 negp neg = NULL; 546 547AAA 548 /* Deal with message according to cookie and command */ 549 switch (msg->header.typecookie) { 550 case NGM_PPPOE_COOKIE: 551 switch (msg->header.cmd) { 552 case NGM_PPPOE_CONNECT: 553 case NGM_PPPOE_LISTEN: 554 case NGM_PPPOE_OFFER: 555 ourmsg = (struct ngPPPoE_init_data *)msg->data; 556 if (( sizeof(*ourmsg) > msg->header.arglen) 557 || ((sizeof(*ourmsg) + ourmsg->data_len) 558 > msg->header.arglen)) { 559 printf("PPPoE_rcvmsg: bad arg size"); 560 LEAVE(EMSGSIZE); 561 } 562 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) { 563 printf("pppoe: init data too long (%d)\n", 564 ourmsg->data_len); 565 LEAVE(EMSGSIZE); 566 } 567 /* make sure strcmp will terminate safely */ 568 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 569 570 /* cycle through all known hooks */ 571 LIST_FOREACH(hook, &node->hooks, hooks) { 572 if (hook->name 573 && strcmp(hook->name, ourmsg->hook) == 0) 574 break; 575 } 576 if (hook == NULL) { 577 LEAVE(ENOENT); 578 } 579 if ((hook->private == &privp->debug_hook) 580 || (hook->private == &privp->ethernet_hook)) { 581 LEAVE(EINVAL); 582 } 583 sp = hook->private; 584 if (sp->state |= PPPOE_SNONE) { 585 printf("pppoe: Session already active\n"); 586 LEAVE(EISCONN); 587 } 588 589 /* 590 * set up prototype header 591 */ 592 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, M_WAITOK); 593 594 if (neg == NULL) { 595 printf("pppoe: Session out of memory\n"); 596 LEAVE(ENOMEM); 597 } 598 bzero(neg, sizeof(*neg)); 599 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 600 if(neg->m == NULL) { 601 printf("pppoe: Session out of mbufs\n"); 602 FREE(neg, M_NETGRAPH); 603 LEAVE(ENOBUFS); 604 } 605 neg->m->m_pkthdr.rcvif = NULL; 606 MCLGET(neg->m, M_DONTWAIT); 607 if ((neg->m->m_flags & M_EXT) == 0) { 608 printf("pppoe: Session out of mcls\n"); 609 m_freem(neg->m); 610 FREE(neg, M_NETGRAPH); 611 LEAVE(ENOBUFS); 612 } 613 sp->neg = neg; 614 callout_handle_init( &neg->timeout_handle); 615 neg->m->m_len = sizeof(struct pppoe_full_hdr); 616 neg->pkt = mtod(neg->m, union packet*); 617 neg->pkt->pkt_header.eh = eh_prototype; 618 neg->pkt->pkt_header.ph.ver = 0x1; 619 neg->pkt->pkt_header.ph.type = 0x1; 620 neg->pkt->pkt_header.ph.sid = 0x0000; 621 neg->timeout = 0; 622 623 strncpy(sp->creator, retaddr, NG_NODELEN); 624 sp->creator[NG_NODELEN] = '\0'; 625 } 626 switch (msg->header.cmd) { 627 case NGM_PPPOE_GET_STATUS: 628 { 629 struct ngPPPoEstat *stats; 630 631 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 632 if (!resp) { 633 LEAVE(ENOMEM); 634 } 635 stats = (struct ngPPPoEstat *) resp->data; 636 stats->packets_in = privp->packets_in; 637 stats->packets_out = privp->packets_out; 638 break; 639 } 640 case NGM_PPPOE_CONNECT: 641 /* 642 * Check the hook exists and is Uninitialised. 643 * Send a PADI request, and start the timeout logic. 644 * Store the originator of this message so we can send 645 * a success of fail message to them later. 646 * Move the session to SINIT 647 * Set up the session to the correct state and 648 * start it. 649 */ 650 neg->service.hdr.tag_type = PTT_SRV_NAME; 651 neg->service.hdr.tag_len = 652 htons((u_int16_t)ourmsg->data_len); 653 if (ourmsg->data_len) { 654 bcopy(ourmsg->data, 655 neg->service.data, ourmsg->data_len); 656 } 657 neg->service_len = ourmsg->data_len; 658 pppoe_start(sp); 659 break; 660 case NGM_PPPOE_LISTEN: 661 /* 662 * Check the hook exists and is Uninitialised. 663 * Install the service matching string. 664 * Store the originator of this message so we can send 665 * a success of fail message to them later. 666 * Move the hook to 'LISTENING' 667 668 */ 669 neg->service.hdr.tag_type = PTT_SRV_NAME; 670 neg->service.hdr.tag_len = 671 htons((u_int16_t)ourmsg->data_len); 672 673 if (ourmsg->data_len) { 674 bcopy(ourmsg->data, 675 neg->service.data, ourmsg->data_len); 676 } 677 neg->service_len = ourmsg->data_len; 678 neg->pkt->pkt_header.ph.code = PADT_CODE; 679 /* 680 * wait for PADI packet coming from ethernet 681 */ 682 sp->state = PPPOE_LISTENING; 683 break; 684 case NGM_PPPOE_OFFER: 685 /* 686 * Check the hook exists and is Uninitialised. 687 * Store the originator of this message so we can send 688 * a success of fail message to them later. 689 * Store the AC-Name given and go to PRIMED. 690 */ 691 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 692 neg->ac_name.hdr.tag_len = 693 htons((u_int16_t)ourmsg->data_len); 694 if (ourmsg->data_len) { 695 bcopy(ourmsg->data, 696 neg->ac_name.data, ourmsg->data_len); 697 } 698 neg->ac_name_len = ourmsg->data_len; 699 neg->pkt->pkt_header.ph.code = PADO_CODE; 700 /* 701 * Wait for PADI packet coming from hook 702 */ 703 sp->state = PPPOE_PRIMED; 704 break; 705 default: 706 LEAVE(EINVAL); 707 } 708 break; 709 default: 710 LEAVE(EINVAL); 711 } 712 713 /* Take care of synchronous response, if any */ 714 if (rptr) 715 *rptr = resp; 716 else if (resp) 717 FREE(resp, M_NETGRAPH); 718 719 /* Free the message and return */ 720quit: 721 FREE(msg, M_NETGRAPH); 722 return(error); 723} 724 725/* 726 * Start a client into the first state. A separate function because 727 * it can be needed if the negotiation times out. 728 */ 729static void 730pppoe_start(sessp sp) 731{ 732 struct { 733 struct pppoe_tag hdr; 734 union uniq data; 735 } uniqtag; 736 737 /* 738 * kick the state machine into starting up 739 */ 740AAA 741 sp->state = PPPOE_SINIT; 742 /* reset the packet header to broadcast */ 743 sp->neg->pkt->pkt_header.eh = eh_prototype; 744 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 745 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 746 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 747 uniqtag.data.pointer = sp; 748 init_tags(sp); 749 insert_tag(sp, &uniqtag.hdr); 750 insert_tag(sp, &sp->neg->service.hdr); 751 make_packet(sp); 752 sendpacket(sp); 753} 754 755/* 756 * Receive data, and do something with it. 757 * The caller will never free m or meta, so 758 * if we use up this data or abort we must free BOTH of these. 759 */ 760static int 761ng_PPPoE_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 762{ 763 node_p node = hook->node; 764 const priv_p privp = node->private; 765 sessp sp = hook->private; 766 struct pppoe_full_hdr *wh; 767 struct pppoe_hdr *ph; 768 int error = 0; 769 u_int16_t session; 770 u_int16_t length; 771 u_int8_t code; 772 struct pppoe_tag *tag = NULL; 773 hook_p sendhook; 774 struct { 775 struct pppoe_tag hdr; 776 union uniq data; 777 } uniqtag; 778 negp neg = NULL; 779 780AAA 781 if (hook->private == &privp->debug_hook) { 782 /* 783 * Data from the debug hook gets sent without modification 784 * straight to the ethernet. 785 */ 786 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 787 privp->packets_out++; 788 } else if (hook->private == &privp->ethernet_hook) { 789 /* 790 * Incoming data. 791 * Dig out various fields from the packet. 792 * use them to decide where to send it. 793 */ 794 795 privp->packets_in++; 796 if( m->m_len < sizeof(*wh)) { 797 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 798 if (m == NULL) { 799 printf("couldn't m_pullup\n"); 800 LEAVE(ENOBUFS); 801 } 802 } 803BBB 804 wh = mtod(m, struct pppoe_full_hdr *); 805 ph = &wh->ph; 806 session = ntohs(wh->ph.sid); 807 length = ntohs(wh->ph.length); 808 code = wh->ph.code; 809BBB 810 switch(wh->eh.ether_type) { 811 case ETHERTYPE_PPPOE_DISC: 812 /* 813 * We need to try make sure that the tag area 814 * is contiguous, or we could wander of the end 815 * of a buffer and make a mess. 816 * (Linux wouldn't have this problem). 817 */ 818BBB 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 839BBB 840 switch(code) { 841 case PADI_CODE: 842BBB 843 /* 844 * We are a server: 845 * Look for a hook with the required service 846 * and send the ENTIRE packet up there. 847 * It should come back to a new hook in 848 * PRIMED state. Look there for further 849 * processing. 850 */ 851 tag = get_tag(ph, PTT_SRV_NAME); 852 if (tag == NULL) { 853 printf("no service tag\n"); 854 LEAVE(ENETUNREACH); 855 } 856BBB 857 sendhook = pppoe_match_svc(hook->node, 858 tag->tag_data, ntohs(tag->tag_len)); 859 if (sendhook) { 860 NG_SEND_DATA(error, sendhook, m, meta); 861 } else { 862 printf("no such service\n"); 863 LEAVE(ENETUNREACH); 864 } 865BBB 866 break; 867 case PADO_CODE: 868 /* 869 * We are a client: 870 * Use the host_uniq tag to find the 871 * hook this is in response to. 872 * Received #2, now send #3 873 * For now simply accept the first we receive. 874 */ 875BBB 876 tag = get_tag(ph, PTT_HOST_UNIQ); 877 if ((tag == NULL) 878 || (ntohs(tag->tag_len) != sizeof(sp))) { 879 printf("no host unique field\n"); 880 LEAVE(ENETUNREACH); 881 } 882BBB 883 884 sendhook = pppoe_finduniq(node, tag); 885 if (sendhook == NULL) { 886 printf("no matching session\n"); 887 LEAVE(ENETUNREACH); 888 } 889BBB 890 891 /* 892 * Check the session is in the right state. 893 * It needs to be in PPPOE_SINIT. 894 */ 895 sp = sendhook->private; 896 if (sp->state != PPPOE_SINIT) { 897 printf("session in wrong state\n"); 898 LEAVE(ENETUNREACH); 899 } 900 neg = sp->neg; 901BBB 902 untimeout(pppoe_ticker, sendhook, 903 neg->timeout_handle); 904 905 /* 906 * This is the first time we hear 907 * from the server, so note it's 908 * unicast address, replacing the 909 * broadcast address . 910 */ 911BBB 912 bcopy(wh->eh.ether_shost, 913 neg->pkt->pkt_header.eh.ether_dhost, 914 ETHER_ADDR_LEN); 915 neg->timeout = 0; 916 neg->pkt->pkt_header.ph.code = PADR_CODE; 917BBB 918 init_tags(sp); 919BBB 920 insert_tag(sp, &neg->service.hdr); /* Service */ 921BBB 922 insert_tag(sp, tag); /* Host Unique */ 923BBB 924 tag = get_tag(ph, PTT_AC_COOKIE); 925 if (tag) 926 insert_tag(sp, tag); /* return cookie */ 927 scan_tags(sp, ph); 928BBB 929 make_packet(sp); 930 sp->state = PPPOE_SREQ; 931BBB 932 sendpacket(sp); 933BBB 934 break; 935 case PADR_CODE: 936 937BBB 938 /* 939 * We are a server: 940 * Use the ac_cookie tag to find the 941 * hook this is in response to. 942 */ 943 tag = get_tag(ph, PTT_AC_COOKIE); 944 if ((tag == NULL) 945 || (ntohs(tag->tag_len) != sizeof(sp))) { 946 LEAVE(ENETUNREACH); 947 } 948 949BBB 950 sendhook = pppoe_finduniq(node, tag); 951 if (sendhook == NULL) { 952 LEAVE(ENETUNREACH); 953 } 954 955BBB 956 /* 957 * Check the session is in the right state. 958 * It needs to be in PPPOE_SOFFER 959 * or PPPOE_NEWCONNECTED. If the latter, 960 * then this is a retry by the client. 961 * so be nice, and resend. 962 */ 963 sp = sendhook->private; 964 if (sp->state == PPPOE_NEWCONNECTED) { 965 /* 966 * Whoa! drop back to resend that 967 * PADS packet. 968 * We should still have a copy of it. 969 */ 970BBB 971 sp->state = PPPOE_SOFFER; 972 } 973BBB 974 if (sp->state != PPPOE_SOFFER) { 975 LEAVE (ENETUNREACH); 976 break; 977 } 978 neg = sp->neg; 979BBB 980 untimeout(pppoe_ticker, sendhook, 981 neg->timeout_handle); 982 neg->pkt->pkt_header.ph.code = PADS_CODE; 983 if (sp->Session_ID == 0) 984 neg->pkt->pkt_header.ph.sid = 985 htons(sp->Session_ID 986 = get_new_sid(node)); 987 neg->timeout = 0; 988BBB 989 /* 990 * start working out the tags to respond with. 991 */ 992 init_tags(sp); 993BBB 994 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 995 insert_tag(sp, tag); /* ac_cookie */ 996 tag = get_tag(ph, PTT_SRV_NAME); 997 insert_tag(sp, tag); /* returned service */ 998 tag = get_tag(ph, PTT_HOST_UNIQ); 999 insert_tag(sp, tag); /* returned hostuniq */ 1000BBB 1001 scan_tags(sp, ph); 1002 make_packet(sp); 1003 sp->state = PPPOE_NEWCONNECTED; 1004BBB 1005 sendpacket(sp); 1006BBB 1007 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1008BBB 1009 /* 1010 * Having sent the last Negotiation header, 1011 * Set up the stored packet header to 1012 * be correct for the actual session. 1013 * But keep the negotialtion stuff 1014 * around in case we need to resend this last 1015 * packet. We'll discard it when we move 1016 * from NEWCONNECTED to CONNECTED 1017 */ 1018 sp->pkt_hdr = neg->pkt->pkt_header; 1019BBB 1020 sp->pkt_hdr.eh.ether_type 1021 = ETHERTYPE_PPPOE_SESS; 1022 sp->pkt_hdr.ph.code = 0; 1023 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1024 break; 1025 case PADS_CODE: 1026 /* 1027 * We are a client: 1028 * Use the host_uniq tag to find the 1029 * hook this is in response to. 1030 * take the session ID and store it away. 1031 * Also make sure the pre-made header is 1032 * correct and set us into Session mode. 1033 */ 1034BBB 1035 tag = get_tag(ph, PTT_HOST_UNIQ); 1036 if ((tag == NULL) 1037 || (ntohs(tag->tag_len) != sizeof(sp))) { 1038 LEAVE (ENETUNREACH); 1039 break; 1040 } 1041BBB 1042 1043 sendhook = pppoe_finduniq(node, tag); 1044 if (sendhook == NULL) { 1045 LEAVE(ENETUNREACH); 1046 } 1047 1048 /* 1049 * Check the session is in the right state. 1050 * It needs to be in PPPOE_SREQ. 1051 */ 1052 sp = sendhook->private; 1053 if (sp->state != PPPOE_SREQ) { 1054 LEAVE(ENETUNREACH); 1055 } 1056 neg = sp->neg; 1057BBB 1058 untimeout(pppoe_ticker, sendhook, 1059 neg->timeout_handle); 1060 sp->Session_ID = ntohs(wh->ph.sid); 1061 neg->timeout = 0; 1062 sp->state = PPPOE_CONNECTED; 1063 sendpacket(sp); 1064 /* 1065 * Now we have gone to Connected mode, 1066 * Free all resources needed for 1067 * negotiation. 1068 * Keep a copy of the header we will be using. 1069 */ 1070BBB 1071 sp->pkt_hdr = neg->pkt->pkt_header; 1072 sp->pkt_hdr.eh.ether_type 1073 = ETHERTYPE_PPPOE_SESS; 1074 sp->pkt_hdr.ph.code = 0; 1075 m_freem(neg->m); 1076 FREE(sp->neg, M_NETGRAPH); 1077 sp->neg = NULL; 1078 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1079 break; 1080 case PADT_CODE: 1081 /* 1082 * Send a 'close' message to the controlling 1083 * process (the one that set us up); 1084 * And then tear everything down. 1085 * 1086 * Find matching peer/session combination. 1087 */ 1088 sendhook = pppoe_findsession(node, wh); 1089 NG_FREE_DATA(m, meta); /* no longer needed */ 1090 if (sendhook == NULL) { 1091 LEAVE(ENETUNREACH); 1092 } 1093 /* send message to creator */ 1094 /* close hook */ 1095 if (sendhook) { 1096 ng_destroy_hook(sendhook); 1097 } 1098 break; 1099 default: 1100 LEAVE(EPFNOSUPPORT); 1101 } 1102 break; 1103 case ETHERTYPE_PPPOE_SESS: 1104 /* 1105 * find matching peer/session combination. 1106 */ 1107 sendhook = pppoe_findsession(node, wh); 1108 if (sendhook == NULL) { 1109 LEAVE (ENETUNREACH); 1110 break; 1111 } 1112 m_adj(m, sizeof(*wh)); 1113 if (m->m_pkthdr.len < length) { 1114 /* Packet too short, dump it */ 1115 LEAVE(EMSGSIZE); 1116 } 1117 /* XXX also need to trim excess at end I should think */ 1118 if ( sp->state != PPPOE_CONNECTED) { 1119 if (sp->state == PPPOE_NEWCONNECTED) { 1120 sp->state = PPPOE_CONNECTED; 1121 /* 1122 * Now we have gone to Connected mode, 1123 * Free all resources needed for 1124 * negotiation. 1125 */ 1126 m_freem(sp->neg->m); 1127 FREE(sp->neg, M_NETGRAPH); 1128 sp->neg = NULL; 1129 } else { 1130 LEAVE (ENETUNREACH); 1131 break; 1132 } 1133 } 1134 NG_SEND_DATA( error, sendhook, m, meta); 1135 break; 1136 default: 1137BBB LEAVE(EPFNOSUPPORT); 1138 } 1139 } else { 1140 /* 1141 * Not ethernet or debug hook.. 1142 * 1143 * The packet has come in on a normal hook. 1144 * We need to find out what kind of hook, 1145 * So we can decide how to handle it. 1146 * Check the hook's state. 1147 */ 1148 sp = hook->private; 1149 switch (sp->state) { 1150 case PPPOE_NEWCONNECTED: 1151 case PPPOE_CONNECTED: { 1152 struct pppoe_full_hdr *wh; 1153 /* 1154 * Bang in a pre-made header, and set the length up 1155 * to be correct. Then send it to the ethernet driver. 1156 */ 1157 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1158 if (m == NULL) { 1159 LEAVE(ENOBUFS); 1160 } 1161 wh = mtod(m, struct pppoe_full_hdr *); 1162 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1163 wh->ph.length = htons((short)(m->m_pkthdr.len)); 1164 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1165 privp->packets_out++; 1166 break; 1167 } 1168 case PPPOE_PRIMED: 1169 /* 1170 * A PADI packet is being returned by the application 1171 * that has set up this hook. This indicates that it 1172 * wants us to offer service. 1173 */ 1174 neg = sp->neg; 1175 m_pullup(m, sizeof(*wh)); /* Checks length */ 1176 if (m == NULL) { 1177 LEAVE(ENOBUFS); 1178 } 1179 wh = mtod(m, struct pppoe_full_hdr *); 1180 ph = &wh->ph; 1181 session = ntohs(wh->ph.sid); 1182 length = ntohs(wh->ph.length); 1183 code = wh->ph.code; 1184 if ( code != PADI_CODE) { 1185 LEAVE(EINVAL); 1186 }; 1187 untimeout(pppoe_ticker, hook, 1188 neg->timeout_handle); 1189 1190 /* 1191 * This is the first time we hear 1192 * from the client, so note it's 1193 * unicast address, replacing the 1194 * broadcast address . 1195 */ 1196 bcopy(wh->eh.ether_shost, 1197 neg->pkt->pkt_header.eh.ether_dhost, 1198 ETHER_ADDR_LEN); 1199 sp->state = PPPOE_SOFFER; 1200 neg->timeout = 0; 1201 neg->pkt->pkt_header.ph.code = PADO_CODE; 1202 1203 /* 1204 * start working out the tags to respond with. 1205 */ 1206 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1207 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1208 uniqtag.data.pointer = sp; 1209 init_tags(sp); 1210 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1211 insert_tag(sp, tag); /* returned hostunique */ 1212 insert_tag(sp, &uniqtag.hdr); /* AC cookie */ 1213 tag = get_tag(ph, PTT_SRV_NAME); 1214 insert_tag(sp, tag); /* returned service */ 1215 /* XXX maybe put the tag in the session store */ 1216 scan_tags(sp, ph); 1217 make_packet(sp); 1218 sendpacket(sp); 1219 break; 1220 1221 /* 1222 * Packets coming from the hook make no sense 1223 * to sessions in these states. Throw them away. 1224 */ 1225 case PPPOE_SINIT: 1226 case PPPOE_SREQ: 1227 case PPPOE_SOFFER: 1228 case PPPOE_SNONE: 1229 case PPPOE_LISTENING: 1230 case PPPOE_DEAD: 1231 default: 1232 LEAVE(ENETUNREACH); 1233 } 1234 } 1235quit: 1236 NG_FREE_DATA(m, meta); 1237 return error; 1238} 1239 1240/* 1241 * Do local shutdown processing.. 1242 * If we are a persistant device, we might refuse to go away, and 1243 * we'd only remove our links and reset ourself. 1244 */ 1245static int 1246ng_PPPoE_rmnode(node_p node) 1247{ 1248 const priv_p privdata = node->private; 1249 1250AAA 1251 node->flags |= NG_INVALID; 1252 ng_cutlinks(node); 1253 ng_unname(node); 1254 node->private = NULL; 1255 ng_unref(privdata->node); 1256 FREE(privdata, M_NETGRAPH); 1257 return (0); 1258} 1259 1260/* 1261 * This is called once we've already connected a new hook to the other node. 1262 * It gives us a chance to balk at the last minute. 1263 */ 1264static int 1265ng_PPPoE_connect(hook_p hook) 1266{ 1267 /* be really amiable and just say "YUP that's OK by me! " */ 1268 return (0); 1269} 1270 1271/* 1272 * Hook disconnection 1273 * 1274 * Clean up all dangling links and infirmation about the session/hook. 1275 * For this type, removal of the last link destroys the node 1276 */ 1277static int 1278ng_PPPoE_disconnect(hook_p hook) 1279{ 1280 node_p node = hook->node; 1281 priv_p privp = node->private; 1282 sessp sp; 1283 1284AAA 1285 if (hook->private == &privp->debug_hook) { 1286 privp->debug_hook = NULL; 1287 } else if (hook->private == &privp->ethernet_hook) { 1288 privp->ethernet_hook = NULL; 1289 } else { 1290 sp = hook->private; 1291 if (sp->state != PPPOE_SNONE ) { 1292 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1293 } 1294 if (sp->neg) { 1295 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1296 if (sp->neg->m) 1297 m_freem(sp->neg->m); 1298 FREE(sp->neg, M_NETGRAPH); 1299 } 1300 FREE(sp, M_NETGRAPH); 1301 hook->private = NULL; 1302 } 1303 if (node->numhooks == 0) 1304 ng_rmnode(node); 1305 return (0); 1306} 1307 1308/* 1309 * timeouts come here. 1310 */ 1311static void 1312pppoe_ticker(void *arg) 1313{ 1314 int s = splnet(); 1315 hook_p hook = arg; 1316 sessp sp = hook->private; 1317 negp neg = sp->neg; 1318 int error = 0; 1319 struct mbuf *m0 = NULL; 1320 priv_p privp = hook->node->private; 1321 meta_p dummy = NULL; 1322 1323AAA 1324 switch(sp->state) { 1325 /* 1326 * resend the last packet, using an exponential backoff. 1327 * After a period of time, stop growing the backoff, 1328 * and either leave it, or reverst to the start. 1329 */ 1330 case PPPOE_SINIT: 1331 case PPPOE_SREQ: 1332 /* timeouts on these produce resends */ 1333 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1334 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1335 neg->timeout_handle = timeout(pppoe_ticker, 1336 hook, neg->timeout * hz); 1337 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1338 if (sp->state == PPPOE_SREQ) { 1339 /* revert to SINIT mode */ 1340 pppoe_start(sp); 1341 } else { 1342 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1343 } 1344 } 1345 break; 1346 case PPPOE_PRIMED: 1347 case PPPOE_SOFFER: 1348 /* a timeout on these says "give up" */ 1349 ng_destroy_hook(hook); 1350 break; 1351 default: 1352 /* timeouts have no meaning in other states */ 1353 printf("pppoe: unexpected timeout\n"); 1354 } 1355 splx(s); 1356} 1357 1358 1359static void 1360sendpacket(sessp sp) 1361{ 1362 int error = 0; 1363 struct mbuf *m0 = NULL; 1364 hook_p hook = sp->hook; 1365 negp neg = sp->neg; 1366 priv_p privp = hook->node->private; 1367 meta_p dummy = NULL; 1368 1369AAA 1370 switch(sp->state) { 1371 case PPPOE_LISTENING: 1372 case PPPOE_DEAD: 1373 case PPPOE_SNONE: 1374 case PPPOE_NEWCONNECTED: 1375 case PPPOE_CONNECTED: 1376 printf("pppoe: sendpacket: unexpected state\n"); 1377 break; 1378 1379 case PPPOE_PRIMED: 1380 /* No packet to send, but set up the timeout */ 1381 neg->timeout_handle = timeout(pppoe_ticker, 1382 hook, PPPOE_OFFER_TIMEOUT * hz); 1383 break; 1384 1385 case PPPOE_SOFFER: 1386 /* 1387 * send the offer but if they don't respond 1388 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1389 */ 1390 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1391 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1392 neg->timeout_handle = timeout(pppoe_ticker, 1393 hook, PPPOE_OFFER_TIMEOUT * hz); 1394 break; 1395 1396 case PPPOE_SINIT: 1397 case PPPOE_SREQ: 1398 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1399 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1400 neg->timeout_handle = timeout(pppoe_ticker, hook, hz); 1401 neg->timeout = 2; 1402 break; 1403 1404 default: 1405 error = EINVAL; 1406 printf("pppoe: timeout: bad state\n"); 1407 } 1408 /* return (error); */ 1409} 1410 1411/* 1412 * Parse an incoming packet to see if any tags should be copied to the 1413 * output packet. DOon't do any tags that are likely to have been 1414 * handles a the main state machine. 1415 */ 1416static struct pppoe_tag* 1417scan_tags(sessp sp, struct pppoe_hdr* ph) 1418{ 1419 char *end = (char *)next_tag(ph); 1420 char *ptn; 1421 struct pppoe_tag *pt = &ph->tag[0]; 1422 /* 1423 * Keep processing tags while a tag header will still fit. 1424 */ 1425AAA 1426 while((char*)(pt + 1) <= end) { 1427 /* 1428 * If the tag data would go past the end of the packet, abort. 1429 */ 1430 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1431 if(ptn > end) 1432 return NULL; 1433 1434 switch (pt->tag_type) { 1435 case PTT_RELAY_SID: 1436 insert_tag(sp, pt); 1437 break; 1438 case PTT_EOL: 1439 return NULL; 1440 case PTT_SRV_NAME: 1441 case PTT_AC_NAME: 1442 case PTT_HOST_UNIQ: 1443 case PTT_AC_COOKIE: 1444 case PTT_VENDOR: 1445 case PTT_SRV_ERR: 1446 case PTT_SYS_ERR: 1447 case PTT_GEN_ERR: 1448 break; 1449 } 1450 pt = (struct pppoe_tag*)ptn; 1451 } 1452 return NULL; 1453} 1454 1455static int 1456pppoe_send_event(sessp sp, enum cmd cmdid) 1457{ 1458 int error; 1459 struct ng_mesg *msg; 1460 struct ngPPPoE_sts *sts; 1461 1462AAA 1463 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1464 sizeof(struct ngPPPoE_sts), M_NOWAIT); 1465 sts = (struct ngPPPoE_sts *)msg->data; 1466 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1467 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1468 return (error); 1469} 1470