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 <sys/sysctl.h> 57 #include <net/ethernet.h> 58 59 #include <netgraph/ng_message.h> 60 #include <netgraph/netgraph.h> 61 #include <netgraph/ng_parse.h> 62 #include <netgraph/ng_pppoe.h> 63 64 #ifdef NG_SEPARATE_MALLOC 65 MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 66 #else 67 #define M_NETGRAPH_PPPOE M_NETGRAPH 68 #endif 69 70 #define SIGNOFF "session closed" 71 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 72 73 /* 74 * This section contains the netgraph method declarations for the 75 * pppoe node. These methods define the netgraph pppoe 'type'. 76 */ 77 78 static ng_constructor_t ng_pppoe_constructor; 79 static ng_rcvmsg_t ng_pppoe_rcvmsg; 80 static ng_shutdown_t ng_pppoe_shutdown; 81 static ng_newhook_t ng_pppoe_newhook; 82 static ng_connect_t ng_pppoe_connect; 83 static ng_rcvdata_t ng_pppoe_rcvdata; 84 static ng_disconnect_t ng_pppoe_disconnect; 85 86 /* Parse type for struct ngpppoe_init_data */ 87 static const struct ng_parse_struct_info ngpppoe_init_data_type_info 88 = NG_PPPOE_INIT_DATA_TYPE_INFO; 89 static const struct ng_parse_type ngpppoe_init_data_state_type = { 90 &ng_parse_struct_type, 91 &ngpppoe_init_data_type_info 92 }; 93 94 /* Parse type for struct ngpppoe_sts */ 95 static const struct ng_parse_struct_info ng_pppoe_sts_type_info 96 = NG_PPPOE_STS_TYPE_INFO; 97 static const struct ng_parse_type ng_pppoe_sts_state_type = { 98 &ng_parse_struct_type, 99 &ng_pppoe_sts_type_info 100 }; 101 102 /* List of commands and how to convert arguments to/from ASCII */ 103 static const struct ng_cmdlist ng_pppoe_cmds[] = { 104 { 105 NGM_PPPOE_COOKIE, 106 NGM_PPPOE_CONNECT, 107 "pppoe_connect", 108 &ngpppoe_init_data_state_type, 109 NULL 110 }, 111 { 112 NGM_PPPOE_COOKIE, 113 NGM_PPPOE_LISTEN, 114 "pppoe_listen", 115 &ngpppoe_init_data_state_type, 116 NULL 117 }, 118 { 119 NGM_PPPOE_COOKIE, 120 NGM_PPPOE_OFFER, 121 "pppoe_offer", 122 &ngpppoe_init_data_state_type, 123 NULL 124 }, 125 { 126 NGM_PPPOE_COOKIE, 127 NGM_PPPOE_SERVICE, 128 "pppoe_service", 129 &ngpppoe_init_data_state_type, 130 NULL 131 }, 132 { 133 NGM_PPPOE_COOKIE, 134 NGM_PPPOE_SUCCESS, 135 "pppoe_success", 136 &ng_pppoe_sts_state_type, 137 NULL 138 }, 139 { 140 NGM_PPPOE_COOKIE, 141 NGM_PPPOE_FAIL, 142 "pppoe_fail", 143 &ng_pppoe_sts_state_type, 144 NULL 145 }, 146 { 147 NGM_PPPOE_COOKIE, 148 NGM_PPPOE_CLOSE, 149 "pppoe_close", 150 &ng_pppoe_sts_state_type, 151 NULL 152 }, 153 { 0 } 154 }; 155 156 /* Netgraph node type descriptor */ 157 static struct ng_type typestruct = { 158 NG_ABI_VERSION, 159 NG_PPPOE_NODE_TYPE, 160 NULL, 161 ng_pppoe_constructor, 162 ng_pppoe_rcvmsg, 163 ng_pppoe_shutdown, 164 ng_pppoe_newhook, 165 NULL, 166 ng_pppoe_connect, 167 ng_pppoe_rcvdata, 168 ng_pppoe_disconnect, 169 ng_pppoe_cmds 170 }; 171 NETGRAPH_INIT(pppoe, &typestruct); 172 /* Depend on ng_ether so we can use the Ethernet parse type */ 173 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1); 174 175 /* 176 * States for the session state machine. 177 * These have no meaning if there is no hook attached yet. 178 */ 179 enum state { 180 PPPOE_SNONE=0, /* [both] Initial state */ 181 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 182 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 183 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 184 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 185 PPPOE_SREQ, /* [Client] Sent a Request */ 186 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 187 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 188 PPPOE_DEAD /* [Both] */ 189 }; 190 191 #define NUMTAGS 20 /* number of tags we are set up to work with */ 192 193 /* 194 * Information we store for each hook on each node for negotiating the 195 * session. The mbuf and cluster are freed once negotiation has completed. 196 * The whole negotiation block is then discarded. 197 */ 198 199 struct sess_neg { 200 struct mbuf *m; /* holds cluster with last sent packet */ 201 union packet *pkt; /* points within the above cluster */ 202 struct callout_handle timeout_handle; /* see timeout(9) */ 203 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 204 u_int numtags; 205 struct pppoe_tag *tags[NUMTAGS]; 206 u_int service_len; 207 u_int ac_name_len; 208 209 struct datatag service; 210 struct datatag ac_name; 211 }; 212 typedef struct sess_neg *negp; 213 214 /* 215 * Session information that is needed after connection. 216 */ 217 struct sess_con { 218 hook_p hook; 219 u_int16_t Session_ID; 220 enum state state; 221 ng_ID_t creator; /* who to notify */ 222 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 223 negp neg; /* used when negotiating */ 224 /*struct sess_con *hash_next;*/ /* not yet used */ 225 }; 226 typedef struct sess_con *sessp; 227 228 /* 229 * Information we store for each node 230 */ 231 struct PPPOE { 232 node_p node; /* back pointer to node */ 233 hook_p ethernet_hook; 234 hook_p debug_hook; 235 u_int packets_in; /* packets in from ethernet */ 236 u_int packets_out; /* packets out towards ethernet */ 237 u_int32_t flags; 238 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 239 }; 240 typedef struct PPPOE *priv_p; 241 242 struct ether_header eh_prototype = 243 {{0xff,0xff,0xff,0xff,0xff,0xff}, 244 {0x00,0x00,0x00,0x00,0x00,0x00}, 245 ETHERTYPE_PPPOE_DISC}; 246 247 int stupid_isp; 248 static int 249 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 250 { 251 int error; 252 int val; 253 254 val = stupid_isp; 255 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 256 if (error != 0 || req->newptr == NULL) 257 return (error); 258 if (val == 1) { 259 stupid_isp = 1; 260 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 261 } else { 262 stupid_isp = 0; 263 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 264 } 265 return (0); 266 } 267 268 SYSCTL_PROC(_net_graph, OID_AUTO, stupid_isp, CTLTYPE_INT | CTLFLAG_RW, 269 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP"); 270 271 union uniq { 272 char bytes[sizeof(void *)]; 273 void * pointer; 274 }; 275 276 #define LEAVE(x) do { error = x; goto quit; } while(0) 277 static void pppoe_start(sessp sp); 278 static void sendpacket(sessp sp); 279 static void pppoe_ticker(void *arg); 280 static struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 281 static int pppoe_send_event(sessp sp, enum cmd cmdid); 282 283 /************************************************************************* 284 * Some basic utilities from the Linux version with author's permission.* 285 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 286 ************************************************************************/ 287 288 /* 289 * Generate a new session id 290 * XXX find out the FreeBSD locking scheme. 291 */ 292 static u_int16_t 293 get_new_sid(node_p node) 294 { 295 static int pppoe_sid = 10; 296 sessp sp; 297 hook_p hook; 298 u_int16_t val; 299 priv_p privp = NG_NODE_PRIVATE(node); 300 301 AAA 302 restart: 303 val = pppoe_sid++; 304 /* 305 * Spec says 0xFFFF is reserved. 306 * Also don't use 0x0000 307 */ 308 if (val == 0xffff) { 309 pppoe_sid = 20; 310 goto restart; 311 } 312 313 /* Check it isn't already in use */ 314 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 315 /* don't check special hooks */ 316 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 317 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 318 continue; 319 sp = NG_HOOK_PRIVATE(hook); 320 if (sp->Session_ID == val) 321 goto restart; 322 } 323 324 return val; 325 } 326 327 328 /* 329 * Return the location where the next tag can be put 330 */ 331 static __inline struct pppoe_tag* 332 next_tag(struct pppoe_hdr* ph) 333 { 334 return (struct pppoe_tag*)(((char*)&ph->tag[0]) + ntohs(ph->length)); 335 } 336 337 /* 338 * Look for a tag of a specific type 339 * Don't trust any length the other end says. 340 * but assume we already sanity checked ph->length. 341 */ 342 static struct pppoe_tag* 343 get_tag(struct pppoe_hdr* ph, u_int16_t idx) 344 { 345 char *end = (char *)next_tag(ph); 346 char *ptn; 347 struct pppoe_tag *pt = &ph->tag[0]; 348 /* 349 * Keep processing tags while a tag header will still fit. 350 */ 351 AAA 352 while((char*)(pt + 1) <= end) { 353 /* 354 * If the tag data would go past the end of the packet, abort. 355 */ 356 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 357 if(ptn > end) 358 return NULL; 359 360 if(pt->tag_type == idx) 361 return pt; 362 363 pt = (struct pppoe_tag*)ptn; 364 } 365 return NULL; 366 } 367 368 /************************************************************************** 369 * inlines to initialise or add tags to a session's tag list, 370 **************************************************************************/ 371 /* 372 * Initialise the session's tag list 373 */ 374 static void 375 init_tags(sessp sp) 376 { 377 AAA 378 if(sp->neg == NULL) { 379 printf("pppoe: asked to init NULL neg pointer\n"); 380 return; 381 } 382 sp->neg->numtags = 0; 383 } 384 385 static void 386 insert_tag(sessp sp, struct pppoe_tag *tp) 387 { 388 int i; 389 negp neg; 390 391 AAA 392 if((neg = sp->neg) == NULL) { 393 printf("pppoe: asked to use NULL neg pointer\n"); 394 return; 395 } 396 if ((i = neg->numtags++) < NUMTAGS) { 397 neg->tags[i] = tp; 398 } else { 399 printf("pppoe: asked to add too many tags to packet\n"); 400 neg->numtags--; 401 } 402 } 403 404 /* 405 * Make up a packet, using the tags filled out for the session. 406 * 407 * Assume that the actual pppoe header and ethernet header 408 * are filled out externally to this routine. 409 * Also assume that neg->wh points to the correct 410 * location at the front of the buffer space. 411 */ 412 static void 413 make_packet(sessp sp) { 414 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 415 struct pppoe_tag **tag; 416 char *dp; 417 int count; 418 int tlen; 419 u_int16_t length = 0; 420 421 AAA 422 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 423 printf("pppoe: make_packet called from wrong state\n"); 424 } 425 dp = (char *)wh->ph.tag; 426 for (count = 0, tag = sp->neg->tags; 427 ((count < sp->neg->numtags) && (count < NUMTAGS)); 428 tag++, count++) { 429 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 430 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 431 printf("pppoe: tags too long\n"); 432 sp->neg->numtags = count; 433 break; /* XXX chop off what's too long */ 434 } 435 bcopy((char *)*tag, (char *)dp, tlen); 436 length += tlen; 437 dp += tlen; 438 } 439 wh->ph.length = htons(length); 440 sp->neg->m->m_len = length + sizeof(*wh); 441 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 442 } 443 444 /************************************************************************** 445 * Routine to match a service offered * 446 **************************************************************************/ 447 /* 448 * Find a hook that has a service string that matches that 449 * we are seeking. for now use a simple string. 450 * In the future we may need something like regexp(). 451 * for testing allow a null string to match 1st found and a null service 452 * to match all requests. Also make '*' do the same. 453 */ 454 static hook_p 455 pppoe_match_svc(node_p node, char *svc_name, int svc_len) 456 { 457 sessp sp = NULL; 458 negp neg = NULL; 459 priv_p privp = NG_NODE_PRIVATE(node); 460 hook_p hook; 461 462 AAA 463 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 464 465 /* skip any hook that is debug or ethernet */ 466 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 467 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 468 continue; 469 sp = NG_HOOK_PRIVATE(hook); 470 471 /* Skip any sessions which are not in LISTEN mode. */ 472 if ( sp->state != PPPOE_LISTENING) 473 continue; 474 475 neg = sp->neg; 476 /* XXX check validity of this */ 477 /* special case, NULL request. match 1st found. */ 478 if (svc_len == 0) 479 break; 480 481 /* XXX check validity of this */ 482 /* Special case for a blank or "*" service name (wildcard) */ 483 if ((neg->service_len == 0) 484 || ((neg->service_len == 1) 485 && (neg->service.data[0] == '*'))) { 486 break; 487 } 488 489 /* If the lengths don't match, that aint it. */ 490 if (neg->service_len != svc_len) 491 continue; 492 493 /* An exact match? */ 494 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 495 break; 496 } 497 return (hook); 498 } 499 /************************************************************************** 500 * Routine to find a particular session that matches an incoming packet * 501 **************************************************************************/ 502 static hook_p 503 pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 504 { 505 sessp sp = NULL; 506 hook_p hook = NULL; 507 priv_p privp = NG_NODE_PRIVATE(node); 508 u_int16_t session = ntohs(wh->ph.sid); 509 510 /* 511 * find matching peer/session combination. 512 */ 513 AAA 514 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 515 /* don't check special hooks */ 516 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 517 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 518 continue; 519 } 520 sp = NG_HOOK_PRIVATE(hook); 521 if ( ( (sp->state == PPPOE_CONNECTED) 522 || (sp->state == PPPOE_NEWCONNECTED) ) 523 && (sp->Session_ID == session) 524 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 525 wh->eh.ether_shost, 526 ETHER_ADDR_LEN)) == 0) { 527 break; 528 } 529 } 530 return (hook); 531 } 532 533 static hook_p 534 pppoe_finduniq(node_p node, struct pppoe_tag *tag) 535 { 536 hook_p hook = NULL; 537 priv_p privp = NG_NODE_PRIVATE(node); 538 union uniq uniq; 539 540 AAA 541 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 542 /* cycle through all known hooks */ 543 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 544 /* don't check special hooks */ 545 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 546 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 547 continue; 548 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 549 break; 550 } 551 return (hook); 552 } 553 554 /************************************************************************** 555 * start of Netgraph entrypoints * 556 **************************************************************************/ 557 558 /* 559 * Allocate the private data structure and the generic node 560 * and link them together. 561 * 562 * ng_make_node_common() returns with a generic node struct 563 * with a single reference for us.. we transfer it to the 564 * private structure.. when we free the private struct we must 565 * unref the node so it gets freed too. 566 */ 567 static int 568 ng_pppoe_constructor(node_p node) 569 { 570 priv_p privdata; 571 572 AAA 573 /* Initialize private descriptor */ 574 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 575 M_NOWAIT | M_ZERO); 576 if (privdata == NULL) 577 return (ENOMEM); 578 579 /* Link structs together; this counts as our one reference to *nodep */ 580 NG_NODE_SET_PRIVATE(node, privdata); 581 privdata->node = node; 582 return (0); 583 } 584 585 /* 586 * Give our ok for a hook to be added... 587 * point the hook's private info to the hook structure. 588 * 589 * The following hook names are special: 590 * Ethernet: the hook that should be connected to a NIC. 591 * debug: copies of data sent out here (when I write the code). 592 * All other hook names need only be unique. (the framework checks this). 593 */ 594 static int 595 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 596 { 597 const priv_p privp = NG_NODE_PRIVATE(node); 598 sessp sp; 599 600 AAA 601 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 602 privp->ethernet_hook = hook; 603 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 604 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 605 privp->debug_hook = hook; 606 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 607 } else { 608 /* 609 * Any other unique name is OK. 610 * The infrastructure has already checked that it's unique, 611 * so just allocate it and hook it in. 612 */ 613 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 614 if (sp == NULL) { 615 return (ENOMEM); 616 } 617 618 NG_HOOK_SET_PRIVATE(hook, sp); 619 sp->hook = hook; 620 } 621 return(0); 622 } 623 624 /* 625 * Get a netgraph control message. 626 * Check it is one we understand. If needed, send a response. 627 * We sometimes save the address for an async action later. 628 * Always free the message. 629 */ 630 static int 631 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 632 { 633 priv_p privp = NG_NODE_PRIVATE(node); 634 struct ngpppoe_init_data *ourmsg = NULL; 635 struct ng_mesg *resp = NULL; 636 int error = 0; 637 hook_p hook = NULL; 638 sessp sp = NULL; 639 negp neg = NULL; 640 struct ng_mesg *msg; 641 642 AAA 643 NGI_GET_MSG(item, msg); 644 /* Deal with message according to cookie and command */ 645 switch (msg->header.typecookie) { 646 case NGM_PPPOE_COOKIE: 647 switch (msg->header.cmd) { 648 case NGM_PPPOE_CONNECT: 649 case NGM_PPPOE_LISTEN: 650 case NGM_PPPOE_OFFER: 651 case NGM_PPPOE_SERVICE: 652 ourmsg = (struct ngpppoe_init_data *)msg->data; 653 if (msg->header.arglen < sizeof(*ourmsg)) { 654 printf("pppoe: init data too small\n"); 655 LEAVE(EMSGSIZE); 656 } 657 if (msg->header.arglen - sizeof(*ourmsg) > 658 PPPOE_SERVICE_NAME_SIZE) { 659 printf("pppoe_rcvmsg: service name too big"); 660 LEAVE(EMSGSIZE); 661 } 662 if (msg->header.arglen - sizeof(*ourmsg) < 663 ourmsg->data_len) { 664 printf("pppoe: init data has bad length," 665 " %d should be %d\n", ourmsg->data_len, 666 msg->header.arglen - sizeof (*ourmsg)); 667 LEAVE(EMSGSIZE); 668 } 669 670 /* make sure strcmp will terminate safely */ 671 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 672 673 /* cycle through all known hooks */ 674 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 675 if (NG_HOOK_NAME(hook) 676 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 677 break; 678 } 679 if (hook == NULL) { 680 LEAVE(ENOENT); 681 } 682 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 683 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 684 LEAVE(EINVAL); 685 } 686 sp = NG_HOOK_PRIVATE(hook); 687 688 /* 689 * PPPOE_SERVICE advertisments are set up 690 * on sessions that are in PRIMED state. 691 */ 692 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 693 break; 694 } 695 if (sp->state |= PPPOE_SNONE) { 696 printf("pppoe: Session already active\n"); 697 LEAVE(EISCONN); 698 } 699 700 /* 701 * set up prototype header 702 */ 703 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 704 M_NOWAIT | M_ZERO); 705 706 if (neg == NULL) { 707 printf("pppoe: Session out of memory\n"); 708 LEAVE(ENOMEM); 709 } 710 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 711 if(neg->m == NULL) { 712 printf("pppoe: Session out of mbufs\n"); 713 FREE(neg, M_NETGRAPH_PPPOE); 714 LEAVE(ENOBUFS); 715 } 716 neg->m->m_pkthdr.rcvif = NULL; 717 MCLGET(neg->m, M_DONTWAIT); 718 if ((neg->m->m_flags & M_EXT) == 0) { 719 printf("pppoe: Session out of mcls\n"); 720 m_freem(neg->m); 721 FREE(neg, M_NETGRAPH_PPPOE); 722 LEAVE(ENOBUFS); 723 } 724 sp->neg = neg; 725 callout_handle_init( &neg->timeout_handle); 726 neg->m->m_len = sizeof(struct pppoe_full_hdr); 727 neg->pkt = mtod(neg->m, union packet*); 728 neg->pkt->pkt_header.eh = eh_prototype; 729 neg->pkt->pkt_header.ph.ver = 0x1; 730 neg->pkt->pkt_header.ph.type = 0x1; 731 neg->pkt->pkt_header.ph.sid = 0x0000; 732 neg->timeout = 0; 733 734 sp->creator = NGI_RETADDR(item); 735 } 736 switch (msg->header.cmd) { 737 case NGM_PPPOE_GET_STATUS: 738 { 739 struct ngpppoestat *stats; 740 741 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 742 if (!resp) { 743 LEAVE(ENOMEM); 744 } 745 stats = (struct ngpppoestat *) resp->data; 746 stats->packets_in = privp->packets_in; 747 stats->packets_out = privp->packets_out; 748 break; 749 } 750 case NGM_PPPOE_CONNECT: 751 /* 752 * Check the hook exists and is Uninitialised. 753 * Send a PADI request, and start the timeout logic. 754 * Store the originator of this message so we can send 755 * a success of fail message to them later. 756 * Move the session to SINIT 757 * Set up the session to the correct state and 758 * start it. 759 */ 760 neg->service.hdr.tag_type = PTT_SRV_NAME; 761 neg->service.hdr.tag_len = 762 htons((u_int16_t)ourmsg->data_len); 763 if (ourmsg->data_len) 764 bcopy(ourmsg->data, neg->service.data, 765 ourmsg->data_len); 766 neg->service_len = ourmsg->data_len; 767 pppoe_start(sp); 768 break; 769 case NGM_PPPOE_LISTEN: 770 /* 771 * Check the hook exists and is Uninitialised. 772 * Install the service matching string. 773 * Store the originator of this message so we can send 774 * a success of fail message to them later. 775 * Move the hook to 'LISTENING' 776 */ 777 neg->service.hdr.tag_type = PTT_SRV_NAME; 778 neg->service.hdr.tag_len = 779 htons((u_int16_t)ourmsg->data_len); 780 781 if (ourmsg->data_len) 782 bcopy(ourmsg->data, neg->service.data, 783 ourmsg->data_len); 784 neg->service_len = ourmsg->data_len; 785 neg->pkt->pkt_header.ph.code = PADT_CODE; 786 /* 787 * wait for PADI packet coming from ethernet 788 */ 789 sp->state = PPPOE_LISTENING; 790 break; 791 case NGM_PPPOE_OFFER: 792 /* 793 * Check the hook exists and is Uninitialised. 794 * Store the originator of this message so we can send 795 * a success of fail message to them later. 796 * Store the AC-Name given and go to PRIMED. 797 */ 798 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 799 neg->ac_name.hdr.tag_len = 800 htons((u_int16_t)ourmsg->data_len); 801 if (ourmsg->data_len) 802 bcopy(ourmsg->data, neg->ac_name.data, 803 ourmsg->data_len); 804 neg->ac_name_len = ourmsg->data_len; 805 neg->pkt->pkt_header.ph.code = PADO_CODE; 806 /* 807 * Wait for PADI packet coming from hook 808 */ 809 sp->state = PPPOE_PRIMED; 810 break; 811 case NGM_PPPOE_SERVICE: 812 /* 813 * Check the session is primed. 814 * for now just allow ONE service to be advertised. 815 * If you do it twice you just overwrite. 816 */ 817 if (sp->state != PPPOE_PRIMED) { 818 printf("pppoe: Session not primed\n"); 819 LEAVE(EISCONN); 820 } 821 neg = sp->neg; 822 neg->service.hdr.tag_type = PTT_SRV_NAME; 823 neg->service.hdr.tag_len = 824 htons((u_int16_t)ourmsg->data_len); 825 826 if (ourmsg->data_len) 827 bcopy(ourmsg->data, neg->service.data, 828 ourmsg->data_len); 829 neg->service_len = ourmsg->data_len; 830 break; 831 default: 832 LEAVE(EINVAL); 833 } 834 break; 835 default: 836 LEAVE(EINVAL); 837 } 838 839 /* Take care of synchronous response, if any */ 840 quit: 841 NG_RESPOND_MSG(error, node, item, resp); 842 /* Free the message and return */ 843 NG_FREE_MSG(msg); 844 return(error); 845 } 846 847 /* 848 * Start a client into the first state. A separate function because 849 * it can be needed if the negotiation times out. 850 */ 851 static void 852 pppoe_start(sessp sp) 853 { 854 struct { 855 struct pppoe_tag hdr; 856 union uniq data; 857 } uniqtag; 858 859 /* 860 * kick the state machine into starting up 861 */ 862 AAA 863 sp->state = PPPOE_SINIT; 864 /* reset the packet header to broadcast */ 865 sp->neg->pkt->pkt_header.eh = eh_prototype; 866 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 867 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 868 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 869 uniqtag.data.pointer = sp; 870 init_tags(sp); 871 insert_tag(sp, &uniqtag.hdr); 872 insert_tag(sp, &sp->neg->service.hdr); 873 make_packet(sp); 874 sendpacket(sp); 875 } 876 877 /* 878 * Receive data, and do something with it. 879 * The caller will never free m or meta, so 880 * if we use up this data or abort we must free BOTH of these. 881 */ 882 static int 883 ng_pppoe_rcvdata(hook_p hook, item_p item) 884 { 885 node_p node = NG_HOOK_NODE(hook); 886 const priv_p privp = NG_NODE_PRIVATE(node); 887 sessp sp = NG_HOOK_PRIVATE(hook); 888 struct pppoe_full_hdr *wh; 889 struct pppoe_hdr *ph; 890 int error = 0; 891 u_int16_t session; 892 u_int16_t length; 893 u_int8_t code; 894 struct pppoe_tag *utag = NULL, *tag = NULL; 895 hook_p sendhook; 896 struct { 897 struct pppoe_tag hdr; 898 union uniq data; 899 } uniqtag; 900 negp neg = NULL; 901 struct mbuf *m; 902 903 AAA 904 NGI_GET_M(item, m); 905 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 906 /* 907 * Data from the debug hook gets sent without modification 908 * straight to the ethernet. 909 */ 910 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 911 privp->packets_out++; 912 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 913 /* 914 * Incoming data. 915 * Dig out various fields from the packet. 916 * use them to decide where to send it. 917 */ 918 919 privp->packets_in++; 920 if( m->m_len < sizeof(*wh)) { 921 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 922 if (m == NULL) { 923 printf("couldn't m_pullup\n"); 924 LEAVE(ENOBUFS); 925 } 926 } 927 wh = mtod(m, struct pppoe_full_hdr *); 928 length = ntohs(wh->ph.length); 929 switch(wh->eh.ether_type) { 930 case ETHERTYPE_PPPOE_STUPID_DISC: 931 stupid_isp = 1; 932 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 933 /* fall through */ 934 case ETHERTYPE_PPPOE_DISC: 935 /* 936 * We need to try to make sure that the tag area 937 * is contiguous, or we could wander off the end 938 * of a buffer and make a mess. 939 * (Linux wouldn't have this problem). 940 */ 941 if (m->m_pkthdr.len <= MHLEN) { 942 if( m->m_len < m->m_pkthdr.len) { 943 m = m_pullup(m, m->m_pkthdr.len); 944 if (m == NULL) { 945 printf("couldn't m_pullup\n"); 946 LEAVE(ENOBUFS); 947 } 948 } 949 } 950 if (m->m_len != m->m_pkthdr.len) { 951 /* 952 * It's not all in one piece. 953 * We need to do extra work. 954 * Put it into a cluster. 955 */ 956 struct mbuf *n; 957 n = m_dup(m, M_DONTWAIT); 958 m_freem(m); 959 m = n; 960 if (m) { 961 /* just check we got a cluster */ 962 if (m->m_len != m->m_pkthdr.len) { 963 m_freem(m); 964 m = NULL; 965 } 966 } 967 if (m == NULL) { 968 printf("packet fragmented\n"); 969 LEAVE(EMSGSIZE); 970 } 971 } 972 wh = mtod(m, struct pppoe_full_hdr *); 973 length = ntohs(wh->ph.length); 974 ph = &wh->ph; 975 session = ntohs(wh->ph.sid); 976 code = wh->ph.code; 977 978 switch(code) { 979 case PADI_CODE: 980 /* 981 * We are a server: 982 * Look for a hook with the required service 983 * and send the ENTIRE packet up there. 984 * It should come back to a new hook in 985 * PRIMED state. Look there for further 986 * processing. 987 */ 988 tag = get_tag(ph, PTT_SRV_NAME); 989 if (tag == NULL) { 990 printf("no service tag\n"); 991 LEAVE(ENETUNREACH); 992 } 993 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 994 tag->tag_data, ntohs(tag->tag_len)); 995 if (sendhook) { 996 NG_FWD_NEW_DATA(error, item, 997 sendhook, m); 998 } else { 999 printf("no such service\n"); 1000 LEAVE(ENETUNREACH); 1001 } 1002 break; 1003 case PADO_CODE: 1004 /* 1005 * We are a client: 1006 * Use the host_uniq tag to find the 1007 * hook this is in response to. 1008 * Received #2, now send #3 1009 * For now simply accept the first we receive. 1010 */ 1011 utag = get_tag(ph, PTT_HOST_UNIQ); 1012 if ((utag == NULL) 1013 || (ntohs(utag->tag_len) != sizeof(sp))) { 1014 printf("no host unique field\n"); 1015 LEAVE(ENETUNREACH); 1016 } 1017 1018 sendhook = pppoe_finduniq(node, utag); 1019 if (sendhook == NULL) { 1020 printf("no matching session\n"); 1021 LEAVE(ENETUNREACH); 1022 } 1023 1024 /* 1025 * Check the session is in the right state. 1026 * It needs to be in PPPOE_SINIT. 1027 */ 1028 sp = NG_HOOK_PRIVATE(sendhook); 1029 if (sp->state != PPPOE_SINIT) { 1030 printf("session in wrong state\n"); 1031 LEAVE(ENETUNREACH); 1032 } 1033 neg = sp->neg; 1034 untimeout(pppoe_ticker, sendhook, 1035 neg->timeout_handle); 1036 1037 /* 1038 * This is the first time we hear 1039 * from the server, so note it's 1040 * unicast address, replacing the 1041 * broadcast address . 1042 */ 1043 bcopy(wh->eh.ether_shost, 1044 neg->pkt->pkt_header.eh.ether_dhost, 1045 ETHER_ADDR_LEN); 1046 neg->timeout = 0; 1047 neg->pkt->pkt_header.ph.code = PADR_CODE; 1048 init_tags(sp); 1049 insert_tag(sp, utag); /* Host Unique */ 1050 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1051 insert_tag(sp, tag); /* return cookie */ 1052 if ((tag = get_tag(ph, PTT_AC_NAME))) 1053 insert_tag(sp, tag); /* return it */ 1054 insert_tag(sp, &neg->service.hdr); /* Service */ 1055 scan_tags(sp, ph); 1056 make_packet(sp); 1057 sp->state = PPPOE_SREQ; 1058 sendpacket(sp); 1059 break; 1060 case PADR_CODE: 1061 1062 /* 1063 * We are a server: 1064 * Use the ac_cookie tag to find the 1065 * hook this is in response to. 1066 */ 1067 utag = get_tag(ph, PTT_AC_COOKIE); 1068 if ((utag == NULL) 1069 || (ntohs(utag->tag_len) != sizeof(sp))) { 1070 LEAVE(ENETUNREACH); 1071 } 1072 1073 sendhook = pppoe_finduniq(node, utag); 1074 if (sendhook == NULL) { 1075 LEAVE(ENETUNREACH); 1076 } 1077 1078 /* 1079 * Check the session is in the right state. 1080 * It needs to be in PPPOE_SOFFER 1081 * or PPPOE_NEWCONNECTED. If the latter, 1082 * then this is a retry by the client. 1083 * so be nice, and resend. 1084 */ 1085 sp = NG_HOOK_PRIVATE(sendhook); 1086 if (sp->state == PPPOE_NEWCONNECTED) { 1087 /* 1088 * Whoa! drop back to resend that 1089 * PADS packet. 1090 * We should still have a copy of it. 1091 */ 1092 sp->state = PPPOE_SOFFER; 1093 } 1094 if (sp->state != PPPOE_SOFFER) { 1095 LEAVE (ENETUNREACH); 1096 break; 1097 } 1098 neg = sp->neg; 1099 untimeout(pppoe_ticker, sendhook, 1100 neg->timeout_handle); 1101 neg->pkt->pkt_header.ph.code = PADS_CODE; 1102 if (sp->Session_ID == 0) 1103 neg->pkt->pkt_header.ph.sid = 1104 htons(sp->Session_ID 1105 = get_new_sid(node)); 1106 neg->timeout = 0; 1107 /* 1108 * start working out the tags to respond with. 1109 */ 1110 init_tags(sp); 1111 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1112 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1113 insert_tag(sp, tag);/* return service */ 1114 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1115 insert_tag(sp, tag); /* return it */ 1116 insert_tag(sp, utag); /* ac_cookie */ 1117 scan_tags(sp, ph); 1118 make_packet(sp); 1119 sp->state = PPPOE_NEWCONNECTED; 1120 sendpacket(sp); 1121 /* 1122 * Having sent the last Negotiation header, 1123 * Set up the stored packet header to 1124 * be correct for the actual session. 1125 * But keep the negotialtion stuff 1126 * around in case we need to resend this last 1127 * packet. We'll discard it when we move 1128 * from NEWCONNECTED to CONNECTED 1129 */ 1130 sp->pkt_hdr = neg->pkt->pkt_header; 1131 if (stupid_isp) 1132 sp->pkt_hdr.eh.ether_type 1133 = ETHERTYPE_PPPOE_STUPID_SESS; 1134 else 1135 sp->pkt_hdr.eh.ether_type 1136 = ETHERTYPE_PPPOE_SESS; 1137 sp->pkt_hdr.ph.code = 0; 1138 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1139 break; 1140 case PADS_CODE: 1141 /* 1142 * We are a client: 1143 * Use the host_uniq tag to find the 1144 * hook this is in response to. 1145 * take the session ID and store it away. 1146 * Also make sure the pre-made header is 1147 * correct and set us into Session mode. 1148 */ 1149 utag = get_tag(ph, PTT_HOST_UNIQ); 1150 if ((utag == NULL) 1151 || (ntohs(utag->tag_len) != sizeof(sp))) { 1152 LEAVE (ENETUNREACH); 1153 break; 1154 } 1155 sendhook = pppoe_finduniq(node, utag); 1156 if (sendhook == NULL) { 1157 LEAVE(ENETUNREACH); 1158 } 1159 1160 /* 1161 * Check the session is in the right state. 1162 * It needs to be in PPPOE_SREQ. 1163 */ 1164 sp = NG_HOOK_PRIVATE(sendhook); 1165 if (sp->state != PPPOE_SREQ) { 1166 LEAVE(ENETUNREACH); 1167 } 1168 neg = sp->neg; 1169 untimeout(pppoe_ticker, sendhook, 1170 neg->timeout_handle); 1171 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1172 sp->Session_ID = ntohs(wh->ph.sid); 1173 neg->timeout = 0; 1174 sp->state = PPPOE_CONNECTED; 1175 /* 1176 * Now we have gone to Connected mode, 1177 * Free all resources needed for 1178 * negotiation. 1179 * Keep a copy of the header we will be using. 1180 */ 1181 sp->pkt_hdr = neg->pkt->pkt_header; 1182 if (stupid_isp) 1183 sp->pkt_hdr.eh.ether_type 1184 = ETHERTYPE_PPPOE_STUPID_SESS; 1185 else 1186 sp->pkt_hdr.eh.ether_type 1187 = ETHERTYPE_PPPOE_SESS; 1188 sp->pkt_hdr.ph.code = 0; 1189 m_freem(neg->m); 1190 FREE(sp->neg, M_NETGRAPH_PPPOE); 1191 sp->neg = NULL; 1192 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1193 break; 1194 case PADT_CODE: 1195 /* 1196 * Send a 'close' message to the controlling 1197 * process (the one that set us up); 1198 * And then tear everything down. 1199 * 1200 * Find matching peer/session combination. 1201 */ 1202 sendhook = pppoe_findsession(node, wh); 1203 if (sendhook == NULL) { 1204 LEAVE(ENETUNREACH); 1205 } 1206 /* send message to creator */ 1207 /* close hook */ 1208 if (sendhook) { 1209 ng_rmhook_self(sendhook); 1210 } 1211 break; 1212 default: 1213 LEAVE(EPFNOSUPPORT); 1214 } 1215 break; 1216 case ETHERTYPE_PPPOE_STUPID_SESS: 1217 case ETHERTYPE_PPPOE_SESS: 1218 /* 1219 * find matching peer/session combination. 1220 */ 1221 sendhook = pppoe_findsession(node, wh); 1222 if (sendhook == NULL) { 1223 LEAVE (ENETUNREACH); 1224 break; 1225 } 1226 sp = NG_HOOK_PRIVATE(sendhook); 1227 m_adj(m, sizeof(*wh)); 1228 if (m->m_pkthdr.len < length) { 1229 /* Packet too short, dump it */ 1230 LEAVE(EMSGSIZE); 1231 } 1232 1233 /* Also need to trim excess at the end */ 1234 if (m->m_pkthdr.len > length) { 1235 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1236 } 1237 if ( sp->state != PPPOE_CONNECTED) { 1238 if (sp->state == PPPOE_NEWCONNECTED) { 1239 sp->state = PPPOE_CONNECTED; 1240 /* 1241 * Now we have gone to Connected mode, 1242 * Free all resources needed for 1243 * negotiation. Be paranoid about 1244 * whether there may be a timeout. 1245 */ 1246 m_freem(sp->neg->m); 1247 untimeout(pppoe_ticker, sendhook, 1248 sp->neg->timeout_handle); 1249 FREE(sp->neg, M_NETGRAPH_PPPOE); 1250 sp->neg = NULL; 1251 } else { 1252 LEAVE (ENETUNREACH); 1253 break; 1254 } 1255 } 1256 NG_FWD_NEW_DATA( error, item, sendhook, m); 1257 break; 1258 default: 1259 LEAVE(EPFNOSUPPORT); 1260 } 1261 } else { 1262 /* 1263 * Not ethernet or debug hook.. 1264 * 1265 * The packet has come in on a normal hook. 1266 * We need to find out what kind of hook, 1267 * So we can decide how to handle it. 1268 * Check the hook's state. 1269 */ 1270 sp = NG_HOOK_PRIVATE(hook); 1271 switch (sp->state) { 1272 case PPPOE_NEWCONNECTED: 1273 case PPPOE_CONNECTED: { 1274 static const u_char addrctrl[] = { 0xff, 0x03 }; 1275 struct pppoe_full_hdr *wh; 1276 1277 /* 1278 * Remove PPP address and control fields, if any. 1279 * For example, ng_ppp(4) always sends LCP packets 1280 * with address and control fields as required by 1281 * generic PPP. PPPoE is an exception to the rule. 1282 */ 1283 if (m->m_pkthdr.len >= 2) { 1284 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1285 LEAVE(ENOBUFS); 1286 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1287 m_adj(m, 2); 1288 } 1289 /* 1290 * Bang in a pre-made header, and set the length up 1291 * to be correct. Then send it to the ethernet driver. 1292 * But first correct the length. 1293 */ 1294 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1295 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1296 if (m == NULL) { 1297 LEAVE(ENOBUFS); 1298 } 1299 wh = mtod(m, struct pppoe_full_hdr *); 1300 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1301 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1302 privp->packets_out++; 1303 break; 1304 } 1305 case PPPOE_PRIMED: 1306 /* 1307 * A PADI packet is being returned by the application 1308 * that has set up this hook. This indicates that it 1309 * wants us to offer service. 1310 */ 1311 neg = sp->neg; 1312 if (m->m_len < sizeof(*wh)) { 1313 m = m_pullup(m, sizeof(*wh)); 1314 if (m == NULL) { 1315 LEAVE(ENOBUFS); 1316 } 1317 } 1318 wh = mtod(m, struct pppoe_full_hdr *); 1319 ph = &wh->ph; 1320 session = ntohs(wh->ph.sid); 1321 length = ntohs(wh->ph.length); 1322 code = wh->ph.code; 1323 if ( code != PADI_CODE) { 1324 LEAVE(EINVAL); 1325 }; 1326 untimeout(pppoe_ticker, hook, 1327 neg->timeout_handle); 1328 1329 /* 1330 * This is the first time we hear 1331 * from the client, so note it's 1332 * unicast address, replacing the 1333 * broadcast address. 1334 */ 1335 bcopy(wh->eh.ether_shost, 1336 neg->pkt->pkt_header.eh.ether_dhost, 1337 ETHER_ADDR_LEN); 1338 sp->state = PPPOE_SOFFER; 1339 neg->timeout = 0; 1340 neg->pkt->pkt_header.ph.code = PADO_CODE; 1341 1342 /* 1343 * start working out the tags to respond with. 1344 */ 1345 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1346 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1347 uniqtag.data.pointer = sp; 1348 init_tags(sp); 1349 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1350 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1351 insert_tag(sp, tag); /* return service */ 1352 /* 1353 * If we have a NULL service request 1354 * and have an extra service defined in this hook, 1355 * then also add a tag for the extra service. 1356 * XXX this is a hack. eventually we should be able 1357 * to support advertising many services, not just one 1358 */ 1359 if (((tag == NULL) || (tag->tag_len == 0)) 1360 && (neg->service.hdr.tag_len != 0)) { 1361 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1362 } 1363 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1364 insert_tag(sp, tag); /* returned hostunique */ 1365 insert_tag(sp, &uniqtag.hdr); 1366 scan_tags(sp, ph); 1367 make_packet(sp); 1368 sendpacket(sp); 1369 break; 1370 1371 /* 1372 * Packets coming from the hook make no sense 1373 * to sessions in these states. Throw them away. 1374 */ 1375 case PPPOE_SINIT: 1376 case PPPOE_SREQ: 1377 case PPPOE_SOFFER: 1378 case PPPOE_SNONE: 1379 case PPPOE_LISTENING: 1380 case PPPOE_DEAD: 1381 default: 1382 LEAVE(ENETUNREACH); 1383 } 1384 } 1385 quit: 1386 if (item) 1387 NG_FREE_ITEM(item); 1388 NG_FREE_M(m); 1389 return error; 1390 } 1391 1392 /* 1393 * Do local shutdown processing.. 1394 * If we are a persistant device, we might refuse to go away, and 1395 * we'd only remove our links and reset ourself. 1396 */ 1397 static int 1398 ng_pppoe_shutdown(node_p node) 1399 { 1400 const priv_p privdata = NG_NODE_PRIVATE(node); 1401 1402 AAA 1403 NG_NODE_SET_PRIVATE(node, NULL); 1404 NG_NODE_UNREF(privdata->node); 1405 FREE(privdata, M_NETGRAPH_PPPOE); 1406 return (0); 1407 } 1408 1409 /* 1410 * This is called once we've already connected a new hook to the other node. 1411 * It gives us a chance to balk at the last minute. 1412 */ 1413 static int 1414 ng_pppoe_connect(hook_p hook) 1415 { 1416 /* be really amiable and just say "YUP that's OK by me! " */ 1417 return (0); 1418 } 1419 1420 /* 1421 * Hook disconnection 1422 * 1423 * Clean up all dangling links and information about the session/hook. 1424 * For this type, removal of the last link destroys the node 1425 */ 1426 static int 1427 ng_pppoe_disconnect(hook_p hook) 1428 { 1429 node_p node = NG_HOOK_NODE(hook); 1430 priv_p privp = NG_NODE_PRIVATE(node); 1431 sessp sp; 1432 int hooks; 1433 1434 AAA 1435 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1436 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1437 privp->debug_hook = NULL; 1438 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1439 privp->ethernet_hook = NULL; 1440 if (NG_NODE_IS_VALID(node)) 1441 ng_rmnode_self(node); 1442 } else { 1443 sp = NG_HOOK_PRIVATE(hook); 1444 if (sp->state != PPPOE_SNONE ) { 1445 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1446 } 1447 /* 1448 * According to the spec, if we are connected, 1449 * we should send a DISC packet if we are shutting down 1450 * a session. 1451 */ 1452 if ((privp->ethernet_hook) 1453 && ((sp->state == PPPOE_CONNECTED) 1454 || (sp->state == PPPOE_NEWCONNECTED))) { 1455 struct mbuf *m; 1456 struct pppoe_full_hdr *wh; 1457 struct pppoe_tag *tag; 1458 int msglen = strlen(SIGNOFF); 1459 int error = 0; 1460 1461 /* revert the stored header to DISC/PADT mode */ 1462 wh = &sp->pkt_hdr; 1463 wh->ph.code = PADT_CODE; 1464 if (stupid_isp) 1465 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1466 else 1467 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1468 1469 /* generate a packet of that type */ 1470 MGETHDR(m, M_DONTWAIT, MT_DATA); 1471 if(m == NULL) 1472 printf("pppoe: Session out of mbufs\n"); 1473 else { 1474 m->m_pkthdr.rcvif = NULL; 1475 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1476 bcopy((caddr_t)wh, mtod(m, caddr_t), 1477 sizeof(*wh)); 1478 /* 1479 * Add a General error message and adjust 1480 * sizes 1481 */ 1482 wh = mtod(m, struct pppoe_full_hdr *); 1483 tag = wh->ph.tag; 1484 tag->tag_type = PTT_GEN_ERR; 1485 tag->tag_len = htons((u_int16_t)msglen); 1486 strncpy(tag->tag_data, SIGNOFF, msglen); 1487 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1488 msglen); 1489 wh->ph.length = htons(sizeof(*tag) + msglen); 1490 NG_SEND_DATA_ONLY(error, 1491 privp->ethernet_hook, m); 1492 } 1493 } 1494 /* 1495 * As long as we have somewhere to store the timeout handle, 1496 * we may have a timeout pending.. get rid of it. 1497 */ 1498 if (sp->neg) { 1499 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1500 if (sp->neg->m) 1501 m_freem(sp->neg->m); 1502 FREE(sp->neg, M_NETGRAPH_PPPOE); 1503 } 1504 FREE(sp, M_NETGRAPH_PPPOE); 1505 NG_HOOK_SET_PRIVATE(hook, NULL); 1506 /* work out how many session hooks there are */ 1507 /* Node goes away on last session hook removal */ 1508 if (privp->ethernet_hook) hooks -= 1; 1509 if (privp->debug_hook) hooks -= 1; 1510 } 1511 if ((NG_NODE_NUMHOOKS(node) == 0) 1512 && (NG_NODE_IS_VALID(node))) 1513 ng_rmnode_self(node); 1514 return (0); 1515 } 1516 1517 /* 1518 * timeouts come here. 1519 */ 1520 static void 1521 pppoe_ticker(void *arg) 1522 { 1523 int s = splnet(); 1524 hook_p hook = arg; 1525 sessp sp = NG_HOOK_PRIVATE(hook); 1526 negp neg = sp->neg; 1527 int error = 0; 1528 struct mbuf *m0 = NULL; 1529 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1530 1531 AAA 1532 switch(sp->state) { 1533 /* 1534 * resend the last packet, using an exponential backoff. 1535 * After a period of time, stop growing the backoff, 1536 * and either leave it, or revert to the start. 1537 */ 1538 case PPPOE_SINIT: 1539 case PPPOE_SREQ: 1540 /* timeouts on these produce resends */ 1541 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1542 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1543 neg->timeout_handle = timeout(pppoe_ticker, 1544 hook, neg->timeout * hz); 1545 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1546 if (sp->state == PPPOE_SREQ) { 1547 /* revert to SINIT mode */ 1548 pppoe_start(sp); 1549 } else { 1550 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1551 } 1552 } 1553 break; 1554 case PPPOE_PRIMED: 1555 case PPPOE_SOFFER: 1556 /* a timeout on these says "give up" */ 1557 ng_rmhook_self(hook); 1558 break; 1559 default: 1560 /* timeouts have no meaning in other states */ 1561 printf("pppoe: unexpected timeout\n"); 1562 } 1563 splx(s); 1564 } 1565 1566 1567 static void 1568 sendpacket(sessp sp) 1569 { 1570 int error = 0; 1571 struct mbuf *m0 = NULL; 1572 hook_p hook = sp->hook; 1573 negp neg = sp->neg; 1574 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1575 1576 AAA 1577 switch(sp->state) { 1578 case PPPOE_LISTENING: 1579 case PPPOE_DEAD: 1580 case PPPOE_SNONE: 1581 case PPPOE_CONNECTED: 1582 printf("pppoe: sendpacket: unexpected state\n"); 1583 break; 1584 1585 case PPPOE_NEWCONNECTED: 1586 /* send the PADS without a timeout - we're now connected */ 1587 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1588 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1589 break; 1590 1591 case PPPOE_PRIMED: 1592 /* No packet to send, but set up the timeout */ 1593 neg->timeout_handle = timeout(pppoe_ticker, 1594 hook, PPPOE_OFFER_TIMEOUT * hz); 1595 break; 1596 1597 case PPPOE_SOFFER: 1598 /* 1599 * send the offer but if they don't respond 1600 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1601 */ 1602 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1603 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1604 neg->timeout_handle = timeout(pppoe_ticker, 1605 hook, PPPOE_OFFER_TIMEOUT * hz); 1606 break; 1607 1608 case PPPOE_SINIT: 1609 case PPPOE_SREQ: 1610 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1611 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1612 neg->timeout_handle = timeout(pppoe_ticker, hook, 1613 (hz * PPPOE_INITIAL_TIMEOUT)); 1614 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1615 break; 1616 1617 default: 1618 error = EINVAL; 1619 printf("pppoe: timeout: bad state\n"); 1620 } 1621 /* return (error); */ 1622 } 1623 1624 /* 1625 * Parse an incoming packet to see if any tags should be copied to the 1626 * output packet. Don't do any tags that have been handled in the main 1627 * state machine. 1628 */ 1629 static struct pppoe_tag* 1630 scan_tags(sessp sp, struct pppoe_hdr* ph) 1631 { 1632 char *end = (char *)next_tag(ph); 1633 char *ptn; 1634 struct pppoe_tag *pt = &ph->tag[0]; 1635 /* 1636 * Keep processing tags while a tag header will still fit. 1637 */ 1638 AAA 1639 while((char*)(pt + 1) <= end) { 1640 /* 1641 * If the tag data would go past the end of the packet, abort. 1642 */ 1643 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1644 if(ptn > end) 1645 return NULL; 1646 1647 switch (pt->tag_type) { 1648 case PTT_RELAY_SID: 1649 insert_tag(sp, pt); 1650 break; 1651 case PTT_EOL: 1652 return NULL; 1653 case PTT_SRV_NAME: 1654 case PTT_AC_NAME: 1655 case PTT_HOST_UNIQ: 1656 case PTT_AC_COOKIE: 1657 case PTT_VENDOR: 1658 case PTT_SRV_ERR: 1659 case PTT_SYS_ERR: 1660 case PTT_GEN_ERR: 1661 break; 1662 } 1663 pt = (struct pppoe_tag*)ptn; 1664 } 1665 return NULL; 1666 } 1667 1668 static int 1669 pppoe_send_event(sessp sp, enum cmd cmdid) 1670 { 1671 int error; 1672 struct ng_mesg *msg; 1673 struct ngpppoe_sts *sts; 1674 1675 AAA 1676 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1677 sizeof(struct ngpppoe_sts), M_NOWAIT); 1678 if (msg == NULL) 1679 return (ENOMEM); 1680 sts = (struct ngpppoe_sts *)msg->data; 1681 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKLEN + 1); 1682 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL); 1683 return (error); 1684 } 1685