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", __func__ ); 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 static int nonstandard; 248 static int 249 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 250 { 251 int error; 252 int val; 253 254 val = nonstandard; 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 nonstandard = 1; 260 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 261 } else { 262 nonstandard = 0; 263 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 264 } 265 return (0); 266 } 267 268 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, 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 */ 454 455 #define NG_MATCH_EXACT 1 456 #define NG_MATCH_ANY 2 457 458 static hook_p 459 pppoe_match_svc(node_p node, char *svc_name, int svc_len, int match) 460 { 461 sessp sp = NULL; 462 negp neg = NULL; 463 priv_p privp = NG_NODE_PRIVATE(node); 464 hook_p allhook = NULL; 465 hook_p hook; 466 467 AAA 468 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 469 470 /* skip any hook that is debug or ethernet */ 471 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 472 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 473 continue; 474 sp = NG_HOOK_PRIVATE(hook); 475 476 /* Skip any sessions which are not in LISTEN mode. */ 477 if ( sp->state != PPPOE_LISTENING) 478 continue; 479 480 neg = sp->neg; 481 482 /* Special case for a blank or "*" service name (wildcard) */ 483 if (match == NG_MATCH_ANY && neg->service_len == 1 && 484 neg->service.data[0] == '*') { 485 allhook = hook; 486 continue; 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 (svc_len == 0) 495 break; 496 497 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 498 break; 499 } 500 return (hook ? hook : allhook); 501 } 502 /************************************************************************** 503 * Routine to find a particular session that matches an incoming packet * 504 **************************************************************************/ 505 static hook_p 506 pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 507 { 508 sessp sp = NULL; 509 hook_p hook = NULL; 510 priv_p privp = NG_NODE_PRIVATE(node); 511 u_int16_t session = ntohs(wh->ph.sid); 512 513 /* 514 * find matching peer/session combination. 515 */ 516 AAA 517 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 518 /* don't check special hooks */ 519 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 520 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 521 continue; 522 } 523 sp = NG_HOOK_PRIVATE(hook); 524 if ( ( (sp->state == PPPOE_CONNECTED) 525 || (sp->state == PPPOE_NEWCONNECTED) ) 526 && (sp->Session_ID == session) 527 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 528 wh->eh.ether_shost, 529 ETHER_ADDR_LEN)) == 0) { 530 break; 531 } 532 } 533 return (hook); 534 } 535 536 static hook_p 537 pppoe_finduniq(node_p node, struct pppoe_tag *tag) 538 { 539 hook_p hook = NULL; 540 priv_p privp = NG_NODE_PRIVATE(node); 541 union uniq uniq; 542 543 AAA 544 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 545 /* cycle through all known hooks */ 546 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 547 /* don't check special hooks */ 548 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 549 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 550 continue; 551 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 552 break; 553 } 554 return (hook); 555 } 556 557 /************************************************************************** 558 * start of Netgraph entrypoints * 559 **************************************************************************/ 560 561 /* 562 * Allocate the private data structure and the generic node 563 * and link them together. 564 * 565 * ng_make_node_common() returns with a generic node struct 566 * with a single reference for us.. we transfer it to the 567 * private structure.. when we free the private struct we must 568 * unref the node so it gets freed too. 569 */ 570 static int 571 ng_pppoe_constructor(node_p node) 572 { 573 priv_p privdata; 574 575 AAA 576 /* Initialize private descriptor */ 577 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 578 M_NOWAIT | M_ZERO); 579 if (privdata == NULL) 580 return (ENOMEM); 581 582 /* Link structs together; this counts as our one reference to *nodep */ 583 NG_NODE_SET_PRIVATE(node, privdata); 584 privdata->node = node; 585 return (0); 586 } 587 588 /* 589 * Give our ok for a hook to be added... 590 * point the hook's private info to the hook structure. 591 * 592 * The following hook names are special: 593 * Ethernet: the hook that should be connected to a NIC. 594 * debug: copies of data sent out here (when I write the code). 595 * All other hook names need only be unique. (the framework checks this). 596 */ 597 static int 598 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 599 { 600 const priv_p privp = NG_NODE_PRIVATE(node); 601 sessp sp; 602 603 AAA 604 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 605 privp->ethernet_hook = hook; 606 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 607 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 608 privp->debug_hook = hook; 609 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 610 } else { 611 /* 612 * Any other unique name is OK. 613 * The infrastructure has already checked that it's unique, 614 * so just allocate it and hook it in. 615 */ 616 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 617 if (sp == NULL) { 618 return (ENOMEM); 619 } 620 621 NG_HOOK_SET_PRIVATE(hook, sp); 622 sp->hook = hook; 623 } 624 return(0); 625 } 626 627 /* 628 * Get a netgraph control message. 629 * Check it is one we understand. If needed, send a response. 630 * We sometimes save the address for an async action later. 631 * Always free the message. 632 */ 633 static int 634 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 635 { 636 priv_p privp = NG_NODE_PRIVATE(node); 637 struct ngpppoe_init_data *ourmsg = NULL; 638 struct ng_mesg *resp = NULL; 639 int error = 0; 640 hook_p hook = NULL; 641 sessp sp = NULL; 642 negp neg = NULL; 643 struct ng_mesg *msg; 644 645 AAA 646 NGI_GET_MSG(item, msg); 647 /* Deal with message according to cookie and command */ 648 switch (msg->header.typecookie) { 649 case NGM_PPPOE_COOKIE: 650 switch (msg->header.cmd) { 651 case NGM_PPPOE_CONNECT: 652 case NGM_PPPOE_LISTEN: 653 case NGM_PPPOE_OFFER: 654 case NGM_PPPOE_SERVICE: 655 ourmsg = (struct ngpppoe_init_data *)msg->data; 656 if (msg->header.arglen < sizeof(*ourmsg)) { 657 printf("pppoe: init data too small\n"); 658 LEAVE(EMSGSIZE); 659 } 660 if (msg->header.arglen - sizeof(*ourmsg) > 661 PPPOE_SERVICE_NAME_SIZE) { 662 printf("pppoe_rcvmsg: service name too big"); 663 LEAVE(EMSGSIZE); 664 } 665 if (msg->header.arglen - sizeof(*ourmsg) < 666 ourmsg->data_len) { 667 printf("pppoe: init data has bad length," 668 " %d should be %d\n", ourmsg->data_len, 669 msg->header.arglen - sizeof (*ourmsg)); 670 LEAVE(EMSGSIZE); 671 } 672 673 /* make sure strcmp will terminate safely */ 674 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 675 676 /* cycle through all known hooks */ 677 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 678 if (NG_HOOK_NAME(hook) 679 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 680 break; 681 } 682 if (hook == NULL) { 683 LEAVE(ENOENT); 684 } 685 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 686 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 687 LEAVE(EINVAL); 688 } 689 sp = NG_HOOK_PRIVATE(hook); 690 691 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 692 /* 693 * Ensure we aren't already listening for this 694 * service. 695 */ 696 if (pppoe_match_svc(node, ourmsg->data, 697 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 698 LEAVE(EEXIST); 699 } 700 } 701 702 /* 703 * PPPOE_SERVICE advertisments are set up 704 * on sessions that are in PRIMED state. 705 */ 706 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 707 break; 708 } 709 if (sp->state |= PPPOE_SNONE) { 710 printf("pppoe: Session already active\n"); 711 LEAVE(EISCONN); 712 } 713 714 /* 715 * set up prototype header 716 */ 717 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 718 M_NOWAIT | M_ZERO); 719 720 if (neg == NULL) { 721 printf("pppoe: Session out of memory\n"); 722 LEAVE(ENOMEM); 723 } 724 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 725 if(neg->m == NULL) { 726 printf("pppoe: Session out of mbufs\n"); 727 FREE(neg, M_NETGRAPH_PPPOE); 728 LEAVE(ENOBUFS); 729 } 730 neg->m->m_pkthdr.rcvif = NULL; 731 MCLGET(neg->m, M_DONTWAIT); 732 if ((neg->m->m_flags & M_EXT) == 0) { 733 printf("pppoe: Session out of mcls\n"); 734 m_freem(neg->m); 735 FREE(neg, M_NETGRAPH_PPPOE); 736 LEAVE(ENOBUFS); 737 } 738 sp->neg = neg; 739 callout_handle_init( &neg->timeout_handle); 740 neg->m->m_len = sizeof(struct pppoe_full_hdr); 741 neg->pkt = mtod(neg->m, union packet*); 742 neg->pkt->pkt_header.eh = eh_prototype; 743 neg->pkt->pkt_header.ph.ver = 0x1; 744 neg->pkt->pkt_header.ph.type = 0x1; 745 neg->pkt->pkt_header.ph.sid = 0x0000; 746 neg->timeout = 0; 747 748 sp->creator = NGI_RETADDR(item); 749 } 750 switch (msg->header.cmd) { 751 case NGM_PPPOE_GET_STATUS: 752 { 753 struct ngpppoestat *stats; 754 755 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 756 if (!resp) { 757 LEAVE(ENOMEM); 758 } 759 stats = (struct ngpppoestat *) resp->data; 760 stats->packets_in = privp->packets_in; 761 stats->packets_out = privp->packets_out; 762 break; 763 } 764 case NGM_PPPOE_CONNECT: 765 /* 766 * Check the hook exists and is Uninitialised. 767 * Send a PADI request, and start the timeout logic. 768 * Store the originator of this message so we can send 769 * a success of fail message to them later. 770 * Move the session to SINIT 771 * Set up the session to the correct state and 772 * start it. 773 */ 774 neg->service.hdr.tag_type = PTT_SRV_NAME; 775 neg->service.hdr.tag_len = 776 htons((u_int16_t)ourmsg->data_len); 777 if (ourmsg->data_len) 778 bcopy(ourmsg->data, neg->service.data, 779 ourmsg->data_len); 780 neg->service_len = ourmsg->data_len; 781 pppoe_start(sp); 782 break; 783 case NGM_PPPOE_LISTEN: 784 /* 785 * Check the hook exists and is Uninitialised. 786 * Install the service matching string. 787 * Store the originator of this message so we can send 788 * a success of fail message to them later. 789 * Move the hook to 'LISTENING' 790 */ 791 neg->service.hdr.tag_type = PTT_SRV_NAME; 792 neg->service.hdr.tag_len = 793 htons((u_int16_t)ourmsg->data_len); 794 795 if (ourmsg->data_len) 796 bcopy(ourmsg->data, neg->service.data, 797 ourmsg->data_len); 798 neg->service_len = ourmsg->data_len; 799 neg->pkt->pkt_header.ph.code = PADT_CODE; 800 /* 801 * wait for PADI packet coming from ethernet 802 */ 803 sp->state = PPPOE_LISTENING; 804 break; 805 case NGM_PPPOE_OFFER: 806 /* 807 * Check the hook exists and is Uninitialised. 808 * Store the originator of this message so we can send 809 * a success of fail message to them later. 810 * Store the AC-Name given and go to PRIMED. 811 */ 812 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 813 neg->ac_name.hdr.tag_len = 814 htons((u_int16_t)ourmsg->data_len); 815 if (ourmsg->data_len) 816 bcopy(ourmsg->data, neg->ac_name.data, 817 ourmsg->data_len); 818 neg->ac_name_len = ourmsg->data_len; 819 neg->pkt->pkt_header.ph.code = PADO_CODE; 820 /* 821 * Wait for PADI packet coming from hook 822 */ 823 sp->state = PPPOE_PRIMED; 824 break; 825 case NGM_PPPOE_SERVICE: 826 /* 827 * Check the session is primed. 828 * for now just allow ONE service to be advertised. 829 * If you do it twice you just overwrite. 830 */ 831 if (sp->state != PPPOE_PRIMED) { 832 printf("pppoe: Session not primed\n"); 833 LEAVE(EISCONN); 834 } 835 neg = sp->neg; 836 neg->service.hdr.tag_type = PTT_SRV_NAME; 837 neg->service.hdr.tag_len = 838 htons((u_int16_t)ourmsg->data_len); 839 840 if (ourmsg->data_len) 841 bcopy(ourmsg->data, neg->service.data, 842 ourmsg->data_len); 843 neg->service_len = ourmsg->data_len; 844 break; 845 default: 846 LEAVE(EINVAL); 847 } 848 break; 849 default: 850 LEAVE(EINVAL); 851 } 852 853 /* Take care of synchronous response, if any */ 854 quit: 855 NG_RESPOND_MSG(error, node, item, resp); 856 /* Free the message and return */ 857 NG_FREE_MSG(msg); 858 return(error); 859 } 860 861 /* 862 * Start a client into the first state. A separate function because 863 * it can be needed if the negotiation times out. 864 */ 865 static void 866 pppoe_start(sessp sp) 867 { 868 struct { 869 struct pppoe_tag hdr; 870 union uniq data; 871 } __attribute ((packed)) uniqtag; 872 873 /* 874 * kick the state machine into starting up 875 */ 876 AAA 877 sp->state = PPPOE_SINIT; 878 /* reset the packet header to broadcast */ 879 sp->neg->pkt->pkt_header.eh = eh_prototype; 880 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 881 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 882 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 883 uniqtag.data.pointer = sp; 884 init_tags(sp); 885 insert_tag(sp, &uniqtag.hdr); 886 insert_tag(sp, &sp->neg->service.hdr); 887 make_packet(sp); 888 sendpacket(sp); 889 } 890 891 /* 892 * Receive data, and do something with it. 893 * The caller will never free m or meta, so 894 * if we use up this data or abort we must free BOTH of these. 895 */ 896 static int 897 ng_pppoe_rcvdata(hook_p hook, item_p item) 898 { 899 node_p node = NG_HOOK_NODE(hook); 900 const priv_p privp = NG_NODE_PRIVATE(node); 901 sessp sp = NG_HOOK_PRIVATE(hook); 902 struct pppoe_full_hdr *wh; 903 struct pppoe_hdr *ph; 904 int error = 0; 905 u_int16_t session; 906 u_int16_t length; 907 u_int8_t code; 908 struct pppoe_tag *utag = NULL, *tag = NULL; 909 hook_p sendhook; 910 struct { 911 struct pppoe_tag hdr; 912 union uniq data; 913 } __attribute ((packed)) uniqtag; 914 negp neg = NULL; 915 struct mbuf *m; 916 917 AAA 918 NGI_GET_M(item, m); 919 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 920 /* 921 * Data from the debug hook gets sent without modification 922 * straight to the ethernet. 923 */ 924 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 925 privp->packets_out++; 926 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 927 /* 928 * Incoming data. 929 * Dig out various fields from the packet. 930 * use them to decide where to send it. 931 */ 932 933 privp->packets_in++; 934 if( m->m_len < sizeof(*wh)) { 935 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 936 if (m == NULL) { 937 printf("couldn't m_pullup\n"); 938 LEAVE(ENOBUFS); 939 } 940 } 941 wh = mtod(m, struct pppoe_full_hdr *); 942 length = ntohs(wh->ph.length); 943 switch(wh->eh.ether_type) { 944 case ETHERTYPE_PPPOE_STUPID_DISC: 945 nonstandard = 1; 946 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 947 /* fall through */ 948 case ETHERTYPE_PPPOE_DISC: 949 /* 950 * We need to try to make sure that the tag area 951 * is contiguous, or we could wander off the end 952 * of a buffer and make a mess. 953 * (Linux wouldn't have this problem). 954 */ 955 if (m->m_pkthdr.len <= MHLEN) { 956 if( m->m_len < m->m_pkthdr.len) { 957 m = m_pullup(m, m->m_pkthdr.len); 958 if (m == NULL) { 959 printf("couldn't m_pullup\n"); 960 LEAVE(ENOBUFS); 961 } 962 } 963 } 964 if (m->m_len != m->m_pkthdr.len) { 965 /* 966 * It's not all in one piece. 967 * We need to do extra work. 968 * Put it into a cluster. 969 */ 970 struct mbuf *n; 971 n = m_dup(m, M_DONTWAIT); 972 m_freem(m); 973 m = n; 974 if (m) { 975 /* just check we got a cluster */ 976 if (m->m_len != m->m_pkthdr.len) { 977 m_freem(m); 978 m = NULL; 979 } 980 } 981 if (m == NULL) { 982 printf("packet fragmented\n"); 983 LEAVE(EMSGSIZE); 984 } 985 } 986 wh = mtod(m, struct pppoe_full_hdr *); 987 length = ntohs(wh->ph.length); 988 ph = &wh->ph; 989 session = ntohs(wh->ph.sid); 990 code = wh->ph.code; 991 992 switch(code) { 993 case PADI_CODE: 994 /* 995 * We are a server: 996 * Look for a hook with the required service 997 * and send the ENTIRE packet up there. 998 * It should come back to a new hook in 999 * PRIMED state. Look there for further 1000 * processing. 1001 */ 1002 tag = get_tag(ph, PTT_SRV_NAME); 1003 if (tag == NULL) { 1004 printf("no service tag\n"); 1005 LEAVE(ENETUNREACH); 1006 } 1007 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1008 tag->tag_data, ntohs(tag->tag_len), 1009 NG_MATCH_ANY); 1010 if (sendhook) { 1011 NG_FWD_NEW_DATA(error, item, 1012 sendhook, m); 1013 } else { 1014 LEAVE(ENETUNREACH); 1015 } 1016 break; 1017 case PADO_CODE: 1018 /* 1019 * We are a client: 1020 * Use the host_uniq tag to find the 1021 * hook this is in response to. 1022 * Received #2, now send #3 1023 * For now simply accept the first we receive. 1024 */ 1025 utag = get_tag(ph, PTT_HOST_UNIQ); 1026 if ((utag == NULL) 1027 || (ntohs(utag->tag_len) != sizeof(sp))) { 1028 printf("no host unique field\n"); 1029 LEAVE(ENETUNREACH); 1030 } 1031 1032 sendhook = pppoe_finduniq(node, utag); 1033 if (sendhook == NULL) { 1034 printf("no matching session\n"); 1035 LEAVE(ENETUNREACH); 1036 } 1037 1038 /* 1039 * Check the session is in the right state. 1040 * It needs to be in PPPOE_SINIT. 1041 */ 1042 sp = NG_HOOK_PRIVATE(sendhook); 1043 if (sp->state != PPPOE_SINIT) { 1044 printf("session in wrong state\n"); 1045 LEAVE(ENETUNREACH); 1046 } 1047 neg = sp->neg; 1048 untimeout(pppoe_ticker, sendhook, 1049 neg->timeout_handle); 1050 1051 /* 1052 * This is the first time we hear 1053 * from the server, so note it's 1054 * unicast address, replacing the 1055 * broadcast address . 1056 */ 1057 bcopy(wh->eh.ether_shost, 1058 neg->pkt->pkt_header.eh.ether_dhost, 1059 ETHER_ADDR_LEN); 1060 neg->timeout = 0; 1061 neg->pkt->pkt_header.ph.code = PADR_CODE; 1062 init_tags(sp); 1063 insert_tag(sp, utag); /* Host Unique */ 1064 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1065 insert_tag(sp, tag); /* return cookie */ 1066 if ((tag = get_tag(ph, PTT_AC_NAME))) 1067 insert_tag(sp, tag); /* return it */ 1068 insert_tag(sp, &neg->service.hdr); /* Service */ 1069 scan_tags(sp, ph); 1070 make_packet(sp); 1071 sp->state = PPPOE_SREQ; 1072 sendpacket(sp); 1073 break; 1074 case PADR_CODE: 1075 1076 /* 1077 * We are a server: 1078 * Use the ac_cookie tag to find the 1079 * hook this is in response to. 1080 */ 1081 utag = get_tag(ph, PTT_AC_COOKIE); 1082 if ((utag == NULL) 1083 || (ntohs(utag->tag_len) != sizeof(sp))) { 1084 LEAVE(ENETUNREACH); 1085 } 1086 1087 sendhook = pppoe_finduniq(node, utag); 1088 if (sendhook == NULL) { 1089 LEAVE(ENETUNREACH); 1090 } 1091 1092 /* 1093 * Check the session is in the right state. 1094 * It needs to be in PPPOE_SOFFER 1095 * or PPPOE_NEWCONNECTED. If the latter, 1096 * then this is a retry by the client. 1097 * so be nice, and resend. 1098 */ 1099 sp = NG_HOOK_PRIVATE(sendhook); 1100 if (sp->state == PPPOE_NEWCONNECTED) { 1101 /* 1102 * Whoa! drop back to resend that 1103 * PADS packet. 1104 * We should still have a copy of it. 1105 */ 1106 sp->state = PPPOE_SOFFER; 1107 } 1108 if (sp->state != PPPOE_SOFFER) { 1109 LEAVE (ENETUNREACH); 1110 break; 1111 } 1112 neg = sp->neg; 1113 untimeout(pppoe_ticker, sendhook, 1114 neg->timeout_handle); 1115 neg->pkt->pkt_header.ph.code = PADS_CODE; 1116 if (sp->Session_ID == 0) 1117 neg->pkt->pkt_header.ph.sid = 1118 htons(sp->Session_ID 1119 = get_new_sid(node)); 1120 neg->timeout = 0; 1121 /* 1122 * start working out the tags to respond with. 1123 */ 1124 init_tags(sp); 1125 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1126 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1127 insert_tag(sp, tag);/* return service */ 1128 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1129 insert_tag(sp, tag); /* return it */ 1130 insert_tag(sp, utag); /* ac_cookie */ 1131 scan_tags(sp, ph); 1132 make_packet(sp); 1133 sp->state = PPPOE_NEWCONNECTED; 1134 sendpacket(sp); 1135 /* 1136 * Having sent the last Negotiation header, 1137 * Set up the stored packet header to 1138 * be correct for the actual session. 1139 * But keep the negotialtion stuff 1140 * around in case we need to resend this last 1141 * packet. We'll discard it when we move 1142 * from NEWCONNECTED to CONNECTED 1143 */ 1144 sp->pkt_hdr = neg->pkt->pkt_header; 1145 if (nonstandard) 1146 sp->pkt_hdr.eh.ether_type 1147 = ETHERTYPE_PPPOE_STUPID_SESS; 1148 else 1149 sp->pkt_hdr.eh.ether_type 1150 = ETHERTYPE_PPPOE_SESS; 1151 sp->pkt_hdr.ph.code = 0; 1152 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1153 break; 1154 case PADS_CODE: 1155 /* 1156 * We are a client: 1157 * Use the host_uniq tag to find the 1158 * hook this is in response to. 1159 * take the session ID and store it away. 1160 * Also make sure the pre-made header is 1161 * correct and set us into Session mode. 1162 */ 1163 utag = get_tag(ph, PTT_HOST_UNIQ); 1164 if ((utag == NULL) 1165 || (ntohs(utag->tag_len) != sizeof(sp))) { 1166 LEAVE (ENETUNREACH); 1167 break; 1168 } 1169 sendhook = pppoe_finduniq(node, utag); 1170 if (sendhook == NULL) { 1171 LEAVE(ENETUNREACH); 1172 } 1173 1174 /* 1175 * Check the session is in the right state. 1176 * It needs to be in PPPOE_SREQ. 1177 */ 1178 sp = NG_HOOK_PRIVATE(sendhook); 1179 if (sp->state != PPPOE_SREQ) { 1180 LEAVE(ENETUNREACH); 1181 } 1182 neg = sp->neg; 1183 untimeout(pppoe_ticker, sendhook, 1184 neg->timeout_handle); 1185 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1186 sp->Session_ID = ntohs(wh->ph.sid); 1187 neg->timeout = 0; 1188 sp->state = PPPOE_CONNECTED; 1189 /* 1190 * Now we have gone to Connected mode, 1191 * Free all resources needed for 1192 * negotiation. 1193 * Keep a copy of the header we will be using. 1194 */ 1195 sp->pkt_hdr = neg->pkt->pkt_header; 1196 if (nonstandard) 1197 sp->pkt_hdr.eh.ether_type 1198 = ETHERTYPE_PPPOE_STUPID_SESS; 1199 else 1200 sp->pkt_hdr.eh.ether_type 1201 = ETHERTYPE_PPPOE_SESS; 1202 sp->pkt_hdr.ph.code = 0; 1203 m_freem(neg->m); 1204 FREE(sp->neg, M_NETGRAPH_PPPOE); 1205 sp->neg = NULL; 1206 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1207 break; 1208 case PADT_CODE: 1209 /* 1210 * Send a 'close' message to the controlling 1211 * process (the one that set us up); 1212 * And then tear everything down. 1213 * 1214 * Find matching peer/session combination. 1215 */ 1216 sendhook = pppoe_findsession(node, wh); 1217 if (sendhook == NULL) { 1218 LEAVE(ENETUNREACH); 1219 } 1220 /* send message to creator */ 1221 /* close hook */ 1222 if (sendhook) { 1223 ng_rmhook_self(sendhook); 1224 } 1225 break; 1226 default: 1227 LEAVE(EPFNOSUPPORT); 1228 } 1229 break; 1230 case ETHERTYPE_PPPOE_STUPID_SESS: 1231 case ETHERTYPE_PPPOE_SESS: 1232 /* 1233 * find matching peer/session combination. 1234 */ 1235 sendhook = pppoe_findsession(node, wh); 1236 if (sendhook == NULL) { 1237 LEAVE (ENETUNREACH); 1238 break; 1239 } 1240 sp = NG_HOOK_PRIVATE(sendhook); 1241 m_adj(m, sizeof(*wh)); 1242 if (m->m_pkthdr.len < length) { 1243 /* Packet too short, dump it */ 1244 LEAVE(EMSGSIZE); 1245 } 1246 1247 /* Also need to trim excess at the end */ 1248 if (m->m_pkthdr.len > length) { 1249 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1250 } 1251 if ( sp->state != PPPOE_CONNECTED) { 1252 if (sp->state == PPPOE_NEWCONNECTED) { 1253 sp->state = PPPOE_CONNECTED; 1254 /* 1255 * Now we have gone to Connected mode, 1256 * Free all resources needed for 1257 * negotiation. Be paranoid about 1258 * whether there may be a timeout. 1259 */ 1260 m_freem(sp->neg->m); 1261 untimeout(pppoe_ticker, sendhook, 1262 sp->neg->timeout_handle); 1263 FREE(sp->neg, M_NETGRAPH_PPPOE); 1264 sp->neg = NULL; 1265 } else { 1266 LEAVE (ENETUNREACH); 1267 break; 1268 } 1269 } 1270 NG_FWD_NEW_DATA( error, item, sendhook, m); 1271 break; 1272 default: 1273 LEAVE(EPFNOSUPPORT); 1274 } 1275 } else { 1276 /* 1277 * Not ethernet or debug hook.. 1278 * 1279 * The packet has come in on a normal hook. 1280 * We need to find out what kind of hook, 1281 * So we can decide how to handle it. 1282 * Check the hook's state. 1283 */ 1284 sp = NG_HOOK_PRIVATE(hook); 1285 switch (sp->state) { 1286 case PPPOE_NEWCONNECTED: 1287 case PPPOE_CONNECTED: { 1288 static const u_char addrctrl[] = { 0xff, 0x03 }; 1289 struct pppoe_full_hdr *wh; 1290 1291 /* 1292 * Remove PPP address and control fields, if any. 1293 * For example, ng_ppp(4) always sends LCP packets 1294 * with address and control fields as required by 1295 * generic PPP. PPPoE is an exception to the rule. 1296 */ 1297 if (m->m_pkthdr.len >= 2) { 1298 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1299 LEAVE(ENOBUFS); 1300 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1301 m_adj(m, 2); 1302 } 1303 /* 1304 * Bang in a pre-made header, and set the length up 1305 * to be correct. Then send it to the ethernet driver. 1306 * But first correct the length. 1307 */ 1308 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1309 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1310 if (m == NULL) { 1311 LEAVE(ENOBUFS); 1312 } 1313 wh = mtod(m, struct pppoe_full_hdr *); 1314 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1315 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1316 privp->packets_out++; 1317 break; 1318 } 1319 case PPPOE_PRIMED: 1320 /* 1321 * A PADI packet is being returned by the application 1322 * that has set up this hook. This indicates that it 1323 * wants us to offer service. 1324 */ 1325 neg = sp->neg; 1326 if (m->m_len < sizeof(*wh)) { 1327 m = m_pullup(m, sizeof(*wh)); 1328 if (m == NULL) { 1329 LEAVE(ENOBUFS); 1330 } 1331 } 1332 wh = mtod(m, struct pppoe_full_hdr *); 1333 ph = &wh->ph; 1334 session = ntohs(wh->ph.sid); 1335 length = ntohs(wh->ph.length); 1336 code = wh->ph.code; 1337 if ( code != PADI_CODE) { 1338 LEAVE(EINVAL); 1339 }; 1340 untimeout(pppoe_ticker, hook, 1341 neg->timeout_handle); 1342 1343 /* 1344 * This is the first time we hear 1345 * from the client, so note it's 1346 * unicast address, replacing the 1347 * broadcast address. 1348 */ 1349 bcopy(wh->eh.ether_shost, 1350 neg->pkt->pkt_header.eh.ether_dhost, 1351 ETHER_ADDR_LEN); 1352 sp->state = PPPOE_SOFFER; 1353 neg->timeout = 0; 1354 neg->pkt->pkt_header.ph.code = PADO_CODE; 1355 1356 /* 1357 * start working out the tags to respond with. 1358 */ 1359 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1360 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1361 uniqtag.data.pointer = sp; 1362 init_tags(sp); 1363 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1364 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1365 insert_tag(sp, tag); /* return service */ 1366 /* 1367 * If we have a NULL service request 1368 * and have an extra service defined in this hook, 1369 * then also add a tag for the extra service. 1370 * XXX this is a hack. eventually we should be able 1371 * to support advertising many services, not just one 1372 */ 1373 if (((tag == NULL) || (tag->tag_len == 0)) 1374 && (neg->service.hdr.tag_len != 0)) { 1375 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1376 } 1377 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1378 insert_tag(sp, tag); /* returned hostunique */ 1379 insert_tag(sp, &uniqtag.hdr); 1380 scan_tags(sp, ph); 1381 make_packet(sp); 1382 sendpacket(sp); 1383 break; 1384 1385 /* 1386 * Packets coming from the hook make no sense 1387 * to sessions in these states. Throw them away. 1388 */ 1389 case PPPOE_SINIT: 1390 case PPPOE_SREQ: 1391 case PPPOE_SOFFER: 1392 case PPPOE_SNONE: 1393 case PPPOE_LISTENING: 1394 case PPPOE_DEAD: 1395 default: 1396 LEAVE(ENETUNREACH); 1397 } 1398 } 1399 quit: 1400 if (item) 1401 NG_FREE_ITEM(item); 1402 NG_FREE_M(m); 1403 return error; 1404 } 1405 1406 /* 1407 * Do local shutdown processing.. 1408 * If we are a persistant device, we might refuse to go away, and 1409 * we'd only remove our links and reset ourself. 1410 */ 1411 static int 1412 ng_pppoe_shutdown(node_p node) 1413 { 1414 const priv_p privdata = NG_NODE_PRIVATE(node); 1415 1416 AAA 1417 NG_NODE_SET_PRIVATE(node, NULL); 1418 NG_NODE_UNREF(privdata->node); 1419 FREE(privdata, M_NETGRAPH_PPPOE); 1420 return (0); 1421 } 1422 1423 /* 1424 * This is called once we've already connected a new hook to the other node. 1425 * It gives us a chance to balk at the last minute. 1426 */ 1427 static int 1428 ng_pppoe_connect(hook_p hook) 1429 { 1430 /* be really amiable and just say "YUP that's OK by me! " */ 1431 return (0); 1432 } 1433 1434 /* 1435 * Hook disconnection 1436 * 1437 * Clean up all dangling links and information about the session/hook. 1438 * For this type, removal of the last link destroys the node 1439 */ 1440 static int 1441 ng_pppoe_disconnect(hook_p hook) 1442 { 1443 node_p node = NG_HOOK_NODE(hook); 1444 priv_p privp = NG_NODE_PRIVATE(node); 1445 sessp sp; 1446 int hooks; 1447 1448 AAA 1449 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1450 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1451 privp->debug_hook = NULL; 1452 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1453 privp->ethernet_hook = NULL; 1454 if (NG_NODE_IS_VALID(node)) 1455 ng_rmnode_self(node); 1456 } else { 1457 sp = NG_HOOK_PRIVATE(hook); 1458 if (sp->state != PPPOE_SNONE ) { 1459 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1460 } 1461 /* 1462 * According to the spec, if we are connected, 1463 * we should send a DISC packet if we are shutting down 1464 * a session. 1465 */ 1466 if ((privp->ethernet_hook) 1467 && ((sp->state == PPPOE_CONNECTED) 1468 || (sp->state == PPPOE_NEWCONNECTED))) { 1469 struct mbuf *m; 1470 struct pppoe_full_hdr *wh; 1471 struct pppoe_tag *tag; 1472 int msglen = strlen(SIGNOFF); 1473 int error = 0; 1474 1475 /* revert the stored header to DISC/PADT mode */ 1476 wh = &sp->pkt_hdr; 1477 wh->ph.code = PADT_CODE; 1478 if (nonstandard) 1479 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1480 else 1481 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1482 1483 /* generate a packet of that type */ 1484 MGETHDR(m, M_DONTWAIT, MT_DATA); 1485 if(m == NULL) 1486 printf("pppoe: Session out of mbufs\n"); 1487 else { 1488 m->m_pkthdr.rcvif = NULL; 1489 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1490 bcopy((caddr_t)wh, mtod(m, caddr_t), 1491 sizeof(*wh)); 1492 /* 1493 * Add a General error message and adjust 1494 * sizes 1495 */ 1496 wh = mtod(m, struct pppoe_full_hdr *); 1497 tag = wh->ph.tag; 1498 tag->tag_type = PTT_GEN_ERR; 1499 tag->tag_len = htons((u_int16_t)msglen); 1500 strncpy(tag->tag_data, SIGNOFF, msglen); 1501 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1502 msglen); 1503 wh->ph.length = htons(sizeof(*tag) + msglen); 1504 NG_SEND_DATA_ONLY(error, 1505 privp->ethernet_hook, m); 1506 } 1507 } 1508 /* 1509 * As long as we have somewhere to store the timeout handle, 1510 * we may have a timeout pending.. get rid of it. 1511 */ 1512 if (sp->neg) { 1513 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1514 if (sp->neg->m) 1515 m_freem(sp->neg->m); 1516 FREE(sp->neg, M_NETGRAPH_PPPOE); 1517 } 1518 FREE(sp, M_NETGRAPH_PPPOE); 1519 NG_HOOK_SET_PRIVATE(hook, NULL); 1520 /* work out how many session hooks there are */ 1521 /* Node goes away on last session hook removal */ 1522 if (privp->ethernet_hook) hooks -= 1; 1523 if (privp->debug_hook) hooks -= 1; 1524 } 1525 if ((NG_NODE_NUMHOOKS(node) == 0) 1526 && (NG_NODE_IS_VALID(node))) 1527 ng_rmnode_self(node); 1528 return (0); 1529 } 1530 1531 /* 1532 * timeouts come here. 1533 */ 1534 static void 1535 pppoe_ticker(void *arg) 1536 { 1537 int s = splnet(); 1538 hook_p hook = arg; 1539 sessp sp = NG_HOOK_PRIVATE(hook); 1540 negp neg = sp->neg; 1541 int error = 0; 1542 struct mbuf *m0 = NULL; 1543 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1544 1545 AAA 1546 switch(sp->state) { 1547 /* 1548 * resend the last packet, using an exponential backoff. 1549 * After a period of time, stop growing the backoff, 1550 * and either leave it, or revert to the start. 1551 */ 1552 case PPPOE_SINIT: 1553 case PPPOE_SREQ: 1554 /* timeouts on these produce resends */ 1555 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1556 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1557 neg->timeout_handle = timeout(pppoe_ticker, 1558 hook, neg->timeout * hz); 1559 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1560 if (sp->state == PPPOE_SREQ) { 1561 /* revert to SINIT mode */ 1562 pppoe_start(sp); 1563 } else { 1564 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1565 } 1566 } 1567 break; 1568 case PPPOE_PRIMED: 1569 case PPPOE_SOFFER: 1570 /* a timeout on these says "give up" */ 1571 ng_rmhook_self(hook); 1572 break; 1573 default: 1574 /* timeouts have no meaning in other states */ 1575 printf("pppoe: unexpected timeout\n"); 1576 } 1577 splx(s); 1578 } 1579 1580 1581 static void 1582 sendpacket(sessp sp) 1583 { 1584 int error = 0; 1585 struct mbuf *m0 = NULL; 1586 hook_p hook = sp->hook; 1587 negp neg = sp->neg; 1588 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1589 1590 AAA 1591 switch(sp->state) { 1592 case PPPOE_LISTENING: 1593 case PPPOE_DEAD: 1594 case PPPOE_SNONE: 1595 case PPPOE_CONNECTED: 1596 printf("pppoe: sendpacket: unexpected state\n"); 1597 break; 1598 1599 case PPPOE_NEWCONNECTED: 1600 /* send the PADS without a timeout - we're now connected */ 1601 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1602 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1603 break; 1604 1605 case PPPOE_PRIMED: 1606 /* No packet to send, but set up the timeout */ 1607 neg->timeout_handle = timeout(pppoe_ticker, 1608 hook, PPPOE_OFFER_TIMEOUT * hz); 1609 break; 1610 1611 case PPPOE_SOFFER: 1612 /* 1613 * send the offer but if they don't respond 1614 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1615 */ 1616 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1617 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1618 neg->timeout_handle = timeout(pppoe_ticker, 1619 hook, PPPOE_OFFER_TIMEOUT * hz); 1620 break; 1621 1622 case PPPOE_SINIT: 1623 case PPPOE_SREQ: 1624 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1625 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1626 neg->timeout_handle = timeout(pppoe_ticker, hook, 1627 (hz * PPPOE_INITIAL_TIMEOUT)); 1628 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1629 break; 1630 1631 default: 1632 error = EINVAL; 1633 printf("pppoe: timeout: bad state\n"); 1634 } 1635 /* return (error); */ 1636 } 1637 1638 /* 1639 * Parse an incoming packet to see if any tags should be copied to the 1640 * output packet. Don't do any tags that have been handled in the main 1641 * state machine. 1642 */ 1643 static struct pppoe_tag* 1644 scan_tags(sessp sp, struct pppoe_hdr* ph) 1645 { 1646 char *end = (char *)next_tag(ph); 1647 char *ptn; 1648 struct pppoe_tag *pt = &ph->tag[0]; 1649 /* 1650 * Keep processing tags while a tag header will still fit. 1651 */ 1652 AAA 1653 while((char*)(pt + 1) <= end) { 1654 /* 1655 * If the tag data would go past the end of the packet, abort. 1656 */ 1657 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1658 if(ptn > end) 1659 return NULL; 1660 1661 switch (pt->tag_type) { 1662 case PTT_RELAY_SID: 1663 insert_tag(sp, pt); 1664 break; 1665 case PTT_EOL: 1666 return NULL; 1667 case PTT_SRV_NAME: 1668 case PTT_AC_NAME: 1669 case PTT_HOST_UNIQ: 1670 case PTT_AC_COOKIE: 1671 case PTT_VENDOR: 1672 case PTT_SRV_ERR: 1673 case PTT_SYS_ERR: 1674 case PTT_GEN_ERR: 1675 break; 1676 } 1677 pt = (struct pppoe_tag*)ptn; 1678 } 1679 return NULL; 1680 } 1681 1682 static int 1683 pppoe_send_event(sessp sp, enum cmd cmdid) 1684 { 1685 int error; 1686 struct ng_mesg *msg; 1687 struct ngpppoe_sts *sts; 1688 1689 AAA 1690 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1691 sizeof(struct ngpppoe_sts), M_NOWAIT); 1692 if (msg == NULL) 1693 return (ENOMEM); 1694 sts = (struct ngpppoe_sts *)msg->data; 1695 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKLEN + 1); 1696 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL); 1697 return (error); 1698 } 1699