Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_pppoe.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 * $FreeBSD$ 40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 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 <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 69 static ng_constructor_t ng_pppoe_constructor; 70 static ng_rcvmsg_t ng_pppoe_rcvmsg; 71 static ng_shutdown_t ng_pppoe_rmnode; 72 static ng_newhook_t ng_pppoe_newhook; 73 static ng_connect_t ng_pppoe_connect; 74 static ng_rcvdata_t ng_pppoe_rcvdata; 75 static ng_disconnect_t ng_pppoe_disconnect; 76 77 /* Netgraph node type descriptor */ 78 static 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 }; 93 NETGRAPH_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 */ 99 enum 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 */ 118 119 struct 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 }; 132 typedef struct sess_neg *negp; 133 134 /* 135 * Session information that is needed after connection. 136 */ 137 struct session { 138 hook_p hook; 139 u_int16_t Session_ID; 140 struct session *hash_next; /* not yet uesed */ 141 enum state state; 142 char creator[NG_NODELEN + 1]; /* who to notify */ 143 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 144 negp neg; /* used when negotiating */ 145 }; 146 typedef struct session *sessp; 147 148 /* 149 * Information we store for each node 150 */ 151 struct 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 session *buckets[HASH_SIZE];*/ /* not yet used */ 159 }; 160 typedef struct PPPOE *priv_p; 161 162 const struct ether_header eh_prototype = 163 {{0xff,0xff,0xff,0xff,0xff,0xff}, 164 {0x00,0x00,0x00,0x00,0x00,0x00}, 165 ETHERTYPE_PPPOE_DISC}; 166 167 union uniq { 168 char bytes[sizeof(void *)]; 169 void * pointer; 170 }; 171 172 #define LEAVE(x) do { error = x; goto quit; } while(0) 173 static void pppoe_start(sessp sp); 174 static void sendpacket(sessp sp); 175 static void pppoe_ticker(void *arg); 176 static struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 177 static 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 */ 188 static u_int16_t 189 get_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; 196 197 AAA 198 restart: 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 */ 227 static __inline struct pppoe_tag* 228 next_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 */ 238 static struct pppoe_tag* 239 get_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 */ 247 AAA 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 */ 270 static void 271 init_tags(sessp sp) 272 { 273 AAA 274 if(sp->neg == NULL) { 275 printf("pppoe: asked to init NULL neg pointer\n"); 276 return; 277 } 278 sp->neg->numtags = 0; 279 } 280 281 static void 282 insert_tag(sessp sp, struct pppoe_tag *tp) 283 { 284 int i; 285 negp neg; 286 287 AAA 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 */ 308 static void 309 make_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; 316 317 AAA 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 */ 350 static hook_p 351 pppoe_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; 357 358 AAA 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 **************************************************************************/ 398 static hook_p 399 pppoe_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 */ 409 AAA 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 } 428 429 static hook_p 430 pppoe_finduniq(node_p node, struct pppoe_tag *tag) 431 { 432 hook_p hook = NULL; 433 priv_p privp = node->private; 434 union uniq uniq; 435 436 AAA 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 */ 467 static int 468 ng_pppoe_constructor(node_p *nodep) 469 { 470 priv_p privdata; 471 int error; 472 473 AAA 474 /* Initialize private descriptor */ 475 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, M_WAITOK); 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 */ 500 static int 501 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 502 { 503 const priv_p privp = node->private; 504 sessp sp; 505 506 AAA 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_WAITOK); 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 */ 537 static int 538 ng_pppoe_rcvmsg(node_p node, 539 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) 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; 548 549 AAA 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_WAITOK); 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 */ 722 quit: 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 */ 731 static void 732 pppoe_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 */ 742 AAA 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, &uniqtag.hdr); 752 insert_tag(sp, &sp->neg->service.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 */ 762 static int 763 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 764 { 765 node_p node = hook->node; 766 const priv_p privp = node->private; 767 sessp sp = hook->private; 768 struct pppoe_full_hdr *wh; 769 struct pppoe_hdr *ph; 770 int error = 0; 771 u_int16_t session; 772 u_int16_t length; 773 u_int8_t code; 774 struct pppoe_tag *utag = NULL, *tag = NULL; 775 hook_p sendhook; 776 struct { 777 struct pppoe_tag hdr; 778 union uniq data; 779 } uniqtag; 780 negp neg = NULL; 781 782 AAA 783 if (hook->private == &privp->debug_hook) { 784 /* 785 * Data from the debug hook gets sent without modification 786 * straight to the ethernet. 787 */ 788 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 789 privp->packets_out++; 790 } else if (hook->private == &privp->ethernet_hook) { 791 /* 792 * Incoming data. 793 * Dig out various fields from the packet. 794 * use them to decide where to send it. 795 */ 796 797 privp->packets_in++; 798 if( m->m_len < sizeof(*wh)) { 799 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 800 if (m == NULL) { 801 printf("couldn't m_pullup\n"); 802 LEAVE(ENOBUFS); 803 } 804 } 805 wh = mtod(m, struct pppoe_full_hdr *); 806 ph = &wh->ph; 807 session = ntohs(wh->ph.sid); 808 length = ntohs(wh->ph.length); 809 code = wh->ph.code; 810 switch(wh->eh.ether_type) { 811 case ETHERTYPE_PPPOE_DISC: 812 /* 813 * We need to try to make sure that the tag area 814 * is contiguous, or we could wander off the end 815 * of a buffer and make a mess. 816 * (Linux wouldn't have this problem). 817 */ 818 /*XXX fix this mess */ 819 820 if (m->m_pkthdr.len <= MHLEN) { 821 if( m->m_len < m->m_pkthdr.len) { 822 m = m_pullup(m, m->m_pkthdr.len); 823 if (m == NULL) { 824 printf("couldn't m_pullup\n"); 825 LEAVE(ENOBUFS); 826 } 827 } 828 } 829 if (m->m_len != m->m_pkthdr.len) { 830 /* 831 * It's not all in one piece. 832 * We need to do extra work. 833 */ 834 printf("packet fragmented\n"); 835 LEAVE(EMSGSIZE); 836 } 837 838 switch(code) { 839 case PADI_CODE: 840 /* 841 * We are a server: 842 * Look for a hook with the required service 843 * and send the ENTIRE packet up there. 844 * It should come back to a new hook in 845 * PRIMED state. Look there for further 846 * processing. 847 */ 848 tag = get_tag(ph, PTT_SRV_NAME); 849 if (tag == NULL) { 850 printf("no service tag\n"); 851 LEAVE(ENETUNREACH); 852 } 853 sendhook = pppoe_match_svc(hook->node, 854 tag->tag_data, ntohs(tag->tag_len)); 855 if (sendhook) { 856 NG_SEND_DATA(error, sendhook, m, meta); 857 } else { 858 printf("no such service\n"); 859 LEAVE(ENETUNREACH); 860 } 861 break; 862 case PADO_CODE: 863 /* 864 * We are a client: 865 * Use the host_uniq tag to find the 866 * hook this is in response to. 867 * Received #2, now send #3 868 * For now simply accept the first we receive. 869 */ 870 utag = get_tag(ph, PTT_HOST_UNIQ); 871 if ((utag == NULL) 872 || (ntohs(utag->tag_len) != sizeof(sp))) { 873 printf("no host unique field\n"); 874 LEAVE(ENETUNREACH); 875 } 876 877 sendhook = pppoe_finduniq(node, utag); 878 if (sendhook == NULL) { 879 printf("no matching session\n"); 880 LEAVE(ENETUNREACH); 881 } 882 883 /* 884 * Check the session is in the right state. 885 * It needs to be in PPPOE_SINIT. 886 */ 887 sp = sendhook->private; 888 if (sp->state != PPPOE_SINIT) { 889 printf("session in wrong state\n"); 890 LEAVE(ENETUNREACH); 891 } 892 neg = sp->neg; 893 untimeout(pppoe_ticker, sendhook, 894 neg->timeout_handle); 895 896 /* 897 * This is the first time we hear 898 * from the server, so note it's 899 * unicast address, replacing the 900 * broadcast address . 901 */ 902 bcopy(wh->eh.ether_shost, 903 neg->pkt->pkt_header.eh.ether_dhost, 904 ETHER_ADDR_LEN); 905 neg->timeout = 0; 906 neg->pkt->pkt_header.ph.code = PADR_CODE; 907 init_tags(sp); 908 insert_tag(sp, utag); /* Host Unique */ 909 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 910 insert_tag(sp, tag); /* return cookie */ 911 if ((tag = get_tag(ph, PTT_AC_NAME))) 912 insert_tag(sp, tag); /* return it */ 913 insert_tag(sp, &neg->service.hdr); /* Service */ 914 scan_tags(sp, ph); 915 make_packet(sp); 916 sp->state = PPPOE_SREQ; 917 sendpacket(sp); 918 break; 919 case PADR_CODE: 920 921 /* 922 * We are a server: 923 * Use the ac_cookie tag to find the 924 * hook this is in response to. 925 */ 926 utag = get_tag(ph, PTT_AC_COOKIE); 927 if ((utag == NULL) 928 || (ntohs(utag->tag_len) != sizeof(sp))) { 929 LEAVE(ENETUNREACH); 930 } 931 932 sendhook = pppoe_finduniq(node, utag); 933 if (sendhook == NULL) { 934 LEAVE(ENETUNREACH); 935 } 936 937 /* 938 * Check the session is in the right state. 939 * It needs to be in PPPOE_SOFFER 940 * or PPPOE_NEWCONNECTED. If the latter, 941 * then this is a retry by the client. 942 * so be nice, and resend. 943 */ 944 sp = sendhook->private; 945 if (sp->state == PPPOE_NEWCONNECTED) { 946 /* 947 * Whoa! drop back to resend that 948 * PADS packet. 949 * We should still have a copy of it. 950 */ 951 sp->state = PPPOE_SOFFER; 952 } 953 if (sp->state != PPPOE_SOFFER) { 954 LEAVE (ENETUNREACH); 955 break; 956 } 957 neg = sp->neg; 958 untimeout(pppoe_ticker, sendhook, 959 neg->timeout_handle); 960 neg->pkt->pkt_header.ph.code = PADS_CODE; 961 if (sp->Session_ID == 0) 962 neg->pkt->pkt_header.ph.sid = 963 htons(sp->Session_ID 964 = get_new_sid(node)); 965 neg->timeout = 0; 966 /* 967 * start working out the tags to respond with. 968 */ 969 init_tags(sp); 970 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 971 if ((tag = get_tag(ph, PTT_SRV_NAME))) 972 insert_tag(sp, tag);/* return service */ 973 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 974 insert_tag(sp, tag); /* return it */ 975 insert_tag(sp, utag); /* ac_cookie */ 976 scan_tags(sp, ph); 977 make_packet(sp); 978 sp->state = PPPOE_NEWCONNECTED; 979 sendpacket(sp); 980 /* 981 * Having sent the last Negotiation header, 982 * Set up the stored packet header to 983 * be correct for the actual session. 984 * But keep the negotialtion stuff 985 * around in case we need to resend this last 986 * packet. We'll discard it when we move 987 * from NEWCONNECTED to CONNECTED 988 */ 989 sp->pkt_hdr = neg->pkt->pkt_header; 990 sp->pkt_hdr.eh.ether_type 991 = ETHERTYPE_PPPOE_SESS; 992 sp->pkt_hdr.ph.code = 0; 993 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 994 break; 995 case PADS_CODE: 996 /* 997 * We are a client: 998 * Use the host_uniq tag to find the 999 * hook this is in response to. 1000 * take the session ID and store it away. 1001 * Also make sure the pre-made header is 1002 * correct and set us into Session mode. 1003 */ 1004 utag = get_tag(ph, PTT_HOST_UNIQ); 1005 if ((utag == NULL) 1006 || (ntohs(utag->tag_len) != sizeof(sp))) { 1007 LEAVE (ENETUNREACH); 1008 break; 1009 } 1010 sendhook = pppoe_finduniq(node, utag); 1011 if (sendhook == NULL) { 1012 LEAVE(ENETUNREACH); 1013 } 1014 1015 /* 1016 * Check the session is in the right state. 1017 * It needs to be in PPPOE_SREQ. 1018 */ 1019 sp = sendhook->private; 1020 if (sp->state != PPPOE_SREQ) { 1021 LEAVE(ENETUNREACH); 1022 } 1023 neg = sp->neg; 1024 untimeout(pppoe_ticker, sendhook, 1025 neg->timeout_handle); 1026 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1027 sp->Session_ID = ntohs(wh->ph.sid); 1028 neg->timeout = 0; 1029 sp->state = PPPOE_CONNECTED; 1030 /* 1031 * Now we have gone to Connected mode, 1032 * Free all resources needed for 1033 * negotiation. 1034 * Keep a copy of the header we will be using. 1035 */ 1036 sp->pkt_hdr = neg->pkt->pkt_header; 1037 sp->pkt_hdr.eh.ether_type 1038 = ETHERTYPE_PPPOE_SESS; 1039 sp->pkt_hdr.ph.code = 0; 1040 m_freem(neg->m); 1041 FREE(sp->neg, M_NETGRAPH); 1042 sp->neg = NULL; 1043 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1044 break; 1045 case PADT_CODE: 1046 /* 1047 * Send a 'close' message to the controlling 1048 * process (the one that set us up); 1049 * And then tear everything down. 1050 * 1051 * Find matching peer/session combination. 1052 */ 1053 sendhook = pppoe_findsession(node, wh); 1054 NG_FREE_DATA(m, meta); /* no longer needed */ 1055 if (sendhook == NULL) { 1056 LEAVE(ENETUNREACH); 1057 } 1058 /* send message to creator */ 1059 /* close hook */ 1060 if (sendhook) { 1061 ng_destroy_hook(sendhook); 1062 } 1063 break; 1064 default: 1065 LEAVE(EPFNOSUPPORT); 1066 } 1067 break; 1068 case ETHERTYPE_PPPOE_SESS: 1069 /* 1070 * find matching peer/session combination. 1071 */ 1072 sendhook = pppoe_findsession(node, wh); 1073 if (sendhook == NULL) { 1074 LEAVE (ENETUNREACH); 1075 break; 1076 } 1077 sp = sendhook->private; 1078 m_adj(m, sizeof(*wh)); 1079 if (m->m_pkthdr.len < length) { 1080 /* Packet too short, dump it */ 1081 LEAVE(EMSGSIZE); 1082 } 1083 1084 /* Also need to trim excess at the end */ 1085 if (m->m_pkthdr.len > length) { 1086 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1087 } 1088 if ( sp->state != PPPOE_CONNECTED) { 1089 if (sp->state == PPPOE_NEWCONNECTED) { 1090 sp->state = PPPOE_CONNECTED; 1091 /* 1092 * Now we have gone to Connected mode, 1093 * Free all resources needed for 1094 * negotiation. 1095 */ 1096 m_freem(sp->neg->m); 1097 FREE(sp->neg, M_NETGRAPH); 1098 sp->neg = NULL; 1099 } else { 1100 LEAVE (ENETUNREACH); 1101 break; 1102 } 1103 } 1104 NG_SEND_DATA( error, sendhook, m, meta); 1105 break; 1106 default: 1107 LEAVE(EPFNOSUPPORT); 1108 } 1109 } else { 1110 /* 1111 * Not ethernet or debug hook.. 1112 * 1113 * The packet has come in on a normal hook. 1114 * We need to find out what kind of hook, 1115 * So we can decide how to handle it. 1116 * Check the hook's state. 1117 */ 1118 sp = hook->private; 1119 switch (sp->state) { 1120 case PPPOE_NEWCONNECTED: 1121 case PPPOE_CONNECTED: { 1122 struct pppoe_full_hdr *wh; 1123 /* 1124 * Bang in a pre-made header, and set the length up 1125 * to be correct. Then send it to the ethernet driver. 1126 * But first correct the length. 1127 */ 1128 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1129 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1130 if (m == NULL) { 1131 LEAVE(ENOBUFS); 1132 } 1133 wh = mtod(m, struct pppoe_full_hdr *); 1134 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1135 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1136 privp->packets_out++; 1137 break; 1138 } 1139 case PPPOE_PRIMED: 1140 /* 1141 * A PADI packet is being returned by the application 1142 * that has set up this hook. This indicates that it 1143 * wants us to offer service. 1144 */ 1145 neg = sp->neg; 1146 if (m->m_len < sizeof(*wh)) { 1147 m = m_pullup(m, sizeof(*wh)); 1148 if (m == NULL) { 1149 LEAVE(ENOBUFS); 1150 } 1151 } 1152 wh = mtod(m, struct pppoe_full_hdr *); 1153 ph = &wh->ph; 1154 session = ntohs(wh->ph.sid); 1155 length = ntohs(wh->ph.length); 1156 code = wh->ph.code; 1157 if ( code != PADI_CODE) { 1158 LEAVE(EINVAL); 1159 }; 1160 untimeout(pppoe_ticker, hook, 1161 neg->timeout_handle); 1162 1163 /* 1164 * This is the first time we hear 1165 * from the client, so note it's 1166 * unicast address, replacing the 1167 * broadcast address. 1168 */ 1169 bcopy(wh->eh.ether_shost, 1170 neg->pkt->pkt_header.eh.ether_dhost, 1171 ETHER_ADDR_LEN); 1172 sp->state = PPPOE_SOFFER; 1173 neg->timeout = 0; 1174 neg->pkt->pkt_header.ph.code = PADO_CODE; 1175 1176 /* 1177 * start working out the tags to respond with. 1178 */ 1179 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1180 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1181 uniqtag.data.pointer = sp; 1182 init_tags(sp); 1183 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1184 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1185 insert_tag(sp, tag); /* return service */ 1186 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1187 insert_tag(sp, tag); /* returned hostunique */ 1188 insert_tag(sp, &uniqtag.hdr); 1189 /* XXX maybe put the tag in the session store */ 1190 scan_tags(sp, ph); 1191 make_packet(sp); 1192 sendpacket(sp); 1193 break; 1194 1195 /* 1196 * Packets coming from the hook make no sense 1197 * to sessions in these states. Throw them away. 1198 */ 1199 case PPPOE_SINIT: 1200 case PPPOE_SREQ: 1201 case PPPOE_SOFFER: 1202 case PPPOE_SNONE: 1203 case PPPOE_LISTENING: 1204 case PPPOE_DEAD: 1205 default: 1206 LEAVE(ENETUNREACH); 1207 } 1208 } 1209 quit: 1210 NG_FREE_DATA(m, meta); 1211 return error; 1212 } 1213 1214 /* 1215 * Do local shutdown processing.. 1216 * If we are a persistant device, we might refuse to go away, and 1217 * we'd only remove our links and reset ourself. 1218 */ 1219 static int 1220 ng_pppoe_rmnode(node_p node) 1221 { 1222 const priv_p privdata = node->private; 1223 1224 AAA 1225 node->flags |= NG_INVALID; 1226 ng_cutlinks(node); 1227 ng_unname(node); 1228 node->private = NULL; 1229 ng_unref(privdata->node); 1230 FREE(privdata, M_NETGRAPH); 1231 return (0); 1232 } 1233 1234 /* 1235 * This is called once we've already connected a new hook to the other node. 1236 * It gives us a chance to balk at the last minute. 1237 */ 1238 static int 1239 ng_pppoe_connect(hook_p hook) 1240 { 1241 /* be really amiable and just say "YUP that's OK by me! " */ 1242 return (0); 1243 } 1244 1245 /* 1246 * Hook disconnection 1247 * 1248 * Clean up all dangling links and information about the session/hook. 1249 * For this type, removal of the last link destroys the node 1250 */ 1251 static int 1252 ng_pppoe_disconnect(hook_p hook) 1253 { 1254 node_p node = hook->node; 1255 priv_p privp = node->private; 1256 sessp sp; 1257 int hooks; 1258 1259 AAA 1260 if (hook->private == &privp->debug_hook) { 1261 privp->debug_hook = NULL; 1262 } else if (hook->private == &privp->ethernet_hook) { 1263 privp->ethernet_hook = NULL; 1264 ng_rmnode(node); 1265 } else { 1266 sp = hook->private; 1267 if (sp->state != PPPOE_SNONE ) { 1268 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1269 } 1270 if ((privp->ethernet_hook) 1271 && ((sp->state == PPPOE_CONNECTED) 1272 || (sp->state == PPPOE_NEWCONNECTED))) { 1273 struct mbuf *m; 1274 struct pppoe_full_hdr *wh; 1275 struct pppoe_tag *tag; 1276 int msglen = strlen(SIGNOFF); 1277 void *dummy = NULL; 1278 int error = 0; 1279 1280 /* revert the stored header to DISC/PADT mode */ 1281 wh = &sp->pkt_hdr; 1282 wh->ph.code = PADT_CODE; 1283 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1284 1285 /* generate a packet of that type */ 1286 MGETHDR(m, M_DONTWAIT, MT_DATA); 1287 if(m == NULL) 1288 printf("pppoe: Session out of mbufs\n"); 1289 else { 1290 m->m_pkthdr.rcvif = NULL; 1291 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1292 bcopy((caddr_t)wh, mtod(m, caddr_t), 1293 sizeof(*wh)); 1294 /* 1295 * Add a General error message and adjust 1296 * sizes 1297 */ 1298 wh = mtod(m, struct pppoe_full_hdr *); 1299 tag = wh->ph.tag; 1300 tag->tag_type = PTT_GEN_ERR; 1301 tag->tag_len = htons((u_int16_t)msglen); 1302 strncpy(tag->tag_data, SIGNOFF, msglen); 1303 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1304 msglen); 1305 wh->ph.length = htons(sizeof(*tag) + msglen); 1306 NG_SEND_DATA(error, privp->ethernet_hook, m, 1307 dummy); 1308 } 1309 } 1310 if (sp->neg) { 1311 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1312 if (sp->neg->m) 1313 m_freem(sp->neg->m); 1314 FREE(sp->neg, M_NETGRAPH); 1315 } 1316 FREE(sp, M_NETGRAPH); 1317 hook->private = NULL; 1318 /* work out how many session hooks there are */ 1319 /* Node goes away on last session hook removal */ 1320 hooks = node->numhooks; /* this one already not counted */ 1321 if (privp->ethernet_hook) hooks -= 1; 1322 if (privp->debug_hook) hooks -= 1; 1323 if (hooks == 0) 1324 ng_rmnode(node); 1325 } 1326 if (node->numhooks == 0) 1327 ng_rmnode(node); 1328 return (0); 1329 } 1330 1331 /* 1332 * timeouts come here. 1333 */ 1334 static void 1335 pppoe_ticker(void *arg) 1336 { 1337 int s = splnet(); 1338 hook_p hook = arg; 1339 sessp sp = hook->private; 1340 negp neg = sp->neg; 1341 int error = 0; 1342 struct mbuf *m0 = NULL; 1343 priv_p privp = hook->node->private; 1344 meta_p dummy = NULL; 1345 1346 AAA 1347 switch(sp->state) { 1348 /* 1349 * resend the last packet, using an exponential backoff. 1350 * After a period of time, stop growing the backoff, 1351 * and either leave it, or revert to the start. 1352 */ 1353 case PPPOE_SINIT: 1354 case PPPOE_SREQ: 1355 /* timeouts on these produce resends */ 1356 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1357 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1358 neg->timeout_handle = timeout(pppoe_ticker, 1359 hook, neg->timeout * hz); 1360 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1361 if (sp->state == PPPOE_SREQ) { 1362 /* revert to SINIT mode */ 1363 pppoe_start(sp); 1364 } else { 1365 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1366 } 1367 } 1368 break; 1369 case PPPOE_PRIMED: 1370 case PPPOE_SOFFER: 1371 /* a timeout on these says "give up" */ 1372 ng_destroy_hook(hook); 1373 break; 1374 default: 1375 /* timeouts have no meaning in other states */ 1376 printf("pppoe: unexpected timeout\n"); 1377 } 1378 splx(s); 1379 } 1380 1381 1382 static void 1383 sendpacket(sessp sp) 1384 { 1385 int error = 0; 1386 struct mbuf *m0 = NULL; 1387 hook_p hook = sp->hook; 1388 negp neg = sp->neg; 1389 priv_p privp = hook->node->private; 1390 meta_p dummy = NULL; 1391 1392 AAA 1393 switch(sp->state) { 1394 case PPPOE_LISTENING: 1395 case PPPOE_DEAD: 1396 case PPPOE_SNONE: 1397 case PPPOE_CONNECTED: 1398 printf("pppoe: sendpacket: unexpected state\n"); 1399 break; 1400 1401 case PPPOE_NEWCONNECTED: 1402 /* send the PADS without a timeout - we're now connected */ 1403 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1404 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1405 break; 1406 1407 case PPPOE_PRIMED: 1408 /* No packet to send, but set up the timeout */ 1409 neg->timeout_handle = timeout(pppoe_ticker, 1410 hook, PPPOE_OFFER_TIMEOUT * hz); 1411 break; 1412 1413 case PPPOE_SOFFER: 1414 /* 1415 * send the offer but if they don't respond 1416 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1417 */ 1418 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1419 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1420 neg->timeout_handle = timeout(pppoe_ticker, 1421 hook, PPPOE_OFFER_TIMEOUT * hz); 1422 break; 1423 1424 case PPPOE_SINIT: 1425 case PPPOE_SREQ: 1426 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1427 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1428 neg->timeout_handle = timeout(pppoe_ticker, hook, 1429 (hz * PPPOE_INITIAL_TIMEOUT)); 1430 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1431 break; 1432 1433 default: 1434 error = EINVAL; 1435 printf("pppoe: timeout: bad state\n"); 1436 } 1437 /* return (error); */ 1438 } 1439 1440 /* 1441 * Parse an incoming packet to see if any tags should be copied to the 1442 * output packet. Don't do any tags that have been handled in the main 1443 * state machine. 1444 */ 1445 static struct pppoe_tag* 1446 scan_tags(sessp sp, struct pppoe_hdr* ph) 1447 { 1448 char *end = (char *)next_tag(ph); 1449 char *ptn; 1450 struct pppoe_tag *pt = &ph->tag[0]; 1451 /* 1452 * Keep processing tags while a tag header will still fit. 1453 */ 1454 AAA 1455 while((char*)(pt + 1) <= end) { 1456 /* 1457 * If the tag data would go past the end of the packet, abort. 1458 */ 1459 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1460 if(ptn > end) 1461 return NULL; 1462 1463 switch (pt->tag_type) { 1464 case PTT_RELAY_SID: 1465 insert_tag(sp, pt); 1466 break; 1467 case PTT_EOL: 1468 return NULL; 1469 case PTT_SRV_NAME: 1470 case PTT_AC_NAME: 1471 case PTT_HOST_UNIQ: 1472 case PTT_AC_COOKIE: 1473 case PTT_VENDOR: 1474 case PTT_SRV_ERR: 1475 case PTT_SYS_ERR: 1476 case PTT_GEN_ERR: 1477 break; 1478 } 1479 pt = (struct pppoe_tag*)ptn; 1480 } 1481 return NULL; 1482 } 1483 1484 static int 1485 pppoe_send_event(sessp sp, enum cmd cmdid) 1486 { 1487 int error; 1488 struct ng_mesg *msg; 1489 struct ngpppoe_sts *sts; 1490 1491 AAA 1492 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1493 sizeof(struct ngpppoe_sts), M_NOWAIT); 1494 sts = (struct ngpppoe_sts *)msg->data; 1495 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1496 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL); 1497 return (error); 1498 }
Cache object: 38fe58463ef4694b20ac6a6e3414af56
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]