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 static int 892 send_acname(sessp sp, struct pppoe_tag *tag) 893 { 894 int error; 895 struct ng_mesg *msg; 896 struct ngpppoe_sts *sts; 897 898 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 899 sizeof(struct ngpppoe_sts), M_NOWAIT); 900 if (msg == NULL) 901 return (ENOMEM); 902 903 sts = (struct ngpppoe_sts *)msg->data; 904 strncpy(sts->hook, tag->tag_data, 905 min(NG_HOOKLEN + 1, ntohs(tag->tag_len))); 906 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL); 907 908 return (error); 909 } 910 911 /* 912 * Receive data, and do something with it. 913 * The caller will never free m or meta, so 914 * if we use up this data or abort we must free BOTH of these. 915 */ 916 static int 917 ng_pppoe_rcvdata(hook_p hook, item_p item) 918 { 919 node_p node = NG_HOOK_NODE(hook); 920 const priv_p privp = NG_NODE_PRIVATE(node); 921 sessp sp = NG_HOOK_PRIVATE(hook); 922 struct pppoe_full_hdr *wh; 923 struct pppoe_hdr *ph; 924 int error = 0; 925 u_int16_t session; 926 u_int16_t length; 927 u_int8_t code; 928 struct pppoe_tag *utag = NULL, *tag = NULL; 929 hook_p sendhook; 930 struct { 931 struct pppoe_tag hdr; 932 union uniq data; 933 } __attribute ((packed)) uniqtag; 934 negp neg = NULL; 935 struct mbuf *m; 936 937 AAA 938 NGI_GET_M(item, m); 939 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 940 /* 941 * Data from the debug hook gets sent without modification 942 * straight to the ethernet. 943 */ 944 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 945 privp->packets_out++; 946 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 947 /* 948 * Incoming data. 949 * Dig out various fields from the packet. 950 * use them to decide where to send it. 951 */ 952 953 privp->packets_in++; 954 if( m->m_len < sizeof(*wh)) { 955 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 956 if (m == NULL) { 957 printf("couldn't m_pullup\n"); 958 LEAVE(ENOBUFS); 959 } 960 } 961 wh = mtod(m, struct pppoe_full_hdr *); 962 length = ntohs(wh->ph.length); 963 switch(wh->eh.ether_type) { 964 case ETHERTYPE_PPPOE_STUPID_DISC: 965 nonstandard = 1; 966 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 967 /* fall through */ 968 case ETHERTYPE_PPPOE_DISC: 969 /* 970 * We need to try to make sure that the tag area 971 * is contiguous, or we could wander off the end 972 * of a buffer and make a mess. 973 * (Linux wouldn't have this problem). 974 */ 975 if (m->m_pkthdr.len <= MHLEN) { 976 if( m->m_len < m->m_pkthdr.len) { 977 m = m_pullup(m, m->m_pkthdr.len); 978 if (m == NULL) { 979 printf("couldn't m_pullup\n"); 980 LEAVE(ENOBUFS); 981 } 982 } 983 } 984 if (m->m_len != m->m_pkthdr.len) { 985 /* 986 * It's not all in one piece. 987 * We need to do extra work. 988 * Put it into a cluster. 989 */ 990 struct mbuf *n; 991 n = m_dup(m, M_DONTWAIT); 992 m_freem(m); 993 m = n; 994 if (m) { 995 /* just check we got a cluster */ 996 if (m->m_len != m->m_pkthdr.len) { 997 m_freem(m); 998 m = NULL; 999 } 1000 } 1001 if (m == NULL) { 1002 printf("packet fragmented\n"); 1003 LEAVE(EMSGSIZE); 1004 } 1005 } 1006 wh = mtod(m, struct pppoe_full_hdr *); 1007 length = ntohs(wh->ph.length); 1008 ph = &wh->ph; 1009 session = ntohs(wh->ph.sid); 1010 code = wh->ph.code; 1011 1012 switch(code) { 1013 case PADI_CODE: 1014 /* 1015 * We are a server: 1016 * Look for a hook with the required service 1017 * and send the ENTIRE packet up there. 1018 * It should come back to a new hook in 1019 * PRIMED state. Look there for further 1020 * processing. 1021 */ 1022 tag = get_tag(ph, PTT_SRV_NAME); 1023 if (tag == NULL) { 1024 printf("no service tag\n"); 1025 LEAVE(ENETUNREACH); 1026 } 1027 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1028 tag->tag_data, ntohs(tag->tag_len), 1029 NG_MATCH_ANY); 1030 if (sendhook) { 1031 NG_FWD_NEW_DATA(error, item, 1032 sendhook, m); 1033 } else { 1034 LEAVE(ENETUNREACH); 1035 } 1036 break; 1037 case PADO_CODE: 1038 /* 1039 * We are a client: 1040 * Use the host_uniq tag to find the 1041 * hook this is in response to. 1042 * Received #2, now send #3 1043 * For now simply accept the first we receive. 1044 */ 1045 utag = get_tag(ph, PTT_HOST_UNIQ); 1046 if ((utag == NULL) 1047 || (ntohs(utag->tag_len) != sizeof(sp))) { 1048 printf("no host unique field\n"); 1049 LEAVE(ENETUNREACH); 1050 } 1051 1052 sendhook = pppoe_finduniq(node, utag); 1053 if (sendhook == NULL) { 1054 printf("no matching session\n"); 1055 LEAVE(ENETUNREACH); 1056 } 1057 1058 /* 1059 * Check the session is in the right state. 1060 * It needs to be in PPPOE_SINIT. 1061 */ 1062 sp = NG_HOOK_PRIVATE(sendhook); 1063 if (sp->state != PPPOE_SINIT) { 1064 printf("session in wrong state\n"); 1065 LEAVE(ENETUNREACH); 1066 } 1067 neg = sp->neg; 1068 untimeout(pppoe_ticker, sendhook, 1069 neg->timeout_handle); 1070 1071 /* 1072 * This is the first time we hear 1073 * from the server, so note it's 1074 * unicast address, replacing the 1075 * broadcast address . 1076 */ 1077 bcopy(wh->eh.ether_shost, 1078 neg->pkt->pkt_header.eh.ether_dhost, 1079 ETHER_ADDR_LEN); 1080 neg->timeout = 0; 1081 neg->pkt->pkt_header.ph.code = PADR_CODE; 1082 init_tags(sp); 1083 insert_tag(sp, utag); /* Host Unique */ 1084 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1085 insert_tag(sp, tag); /* return cookie */ 1086 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1087 insert_tag(sp, tag); /* return it */ 1088 send_acname(sp, tag); 1089 } 1090 insert_tag(sp, &neg->service.hdr); /* Service */ 1091 scan_tags(sp, ph); 1092 make_packet(sp); 1093 sp->state = PPPOE_SREQ; 1094 sendpacket(sp); 1095 break; 1096 case PADR_CODE: 1097 1098 /* 1099 * We are a server: 1100 * Use the ac_cookie tag to find the 1101 * hook this is in response to. 1102 */ 1103 utag = get_tag(ph, PTT_AC_COOKIE); 1104 if ((utag == NULL) 1105 || (ntohs(utag->tag_len) != sizeof(sp))) { 1106 LEAVE(ENETUNREACH); 1107 } 1108 1109 sendhook = pppoe_finduniq(node, utag); 1110 if (sendhook == NULL) { 1111 LEAVE(ENETUNREACH); 1112 } 1113 1114 /* 1115 * Check the session is in the right state. 1116 * It needs to be in PPPOE_SOFFER 1117 * or PPPOE_NEWCONNECTED. If the latter, 1118 * then this is a retry by the client. 1119 * so be nice, and resend. 1120 */ 1121 sp = NG_HOOK_PRIVATE(sendhook); 1122 if (sp->state == PPPOE_NEWCONNECTED) { 1123 /* 1124 * Whoa! drop back to resend that 1125 * PADS packet. 1126 * We should still have a copy of it. 1127 */ 1128 sp->state = PPPOE_SOFFER; 1129 } 1130 if (sp->state != PPPOE_SOFFER) { 1131 LEAVE (ENETUNREACH); 1132 break; 1133 } 1134 neg = sp->neg; 1135 untimeout(pppoe_ticker, sendhook, 1136 neg->timeout_handle); 1137 neg->pkt->pkt_header.ph.code = PADS_CODE; 1138 if (sp->Session_ID == 0) 1139 neg->pkt->pkt_header.ph.sid = 1140 htons(sp->Session_ID 1141 = get_new_sid(node)); 1142 neg->timeout = 0; 1143 /* 1144 * start working out the tags to respond with. 1145 */ 1146 init_tags(sp); 1147 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1148 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1149 insert_tag(sp, tag);/* return service */ 1150 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1151 insert_tag(sp, tag); /* return it */ 1152 insert_tag(sp, utag); /* ac_cookie */ 1153 scan_tags(sp, ph); 1154 make_packet(sp); 1155 sp->state = PPPOE_NEWCONNECTED; 1156 sendpacket(sp); 1157 /* 1158 * Having sent the last Negotiation header, 1159 * Set up the stored packet header to 1160 * be correct for the actual session. 1161 * But keep the negotialtion stuff 1162 * around in case we need to resend this last 1163 * packet. We'll discard it when we move 1164 * from NEWCONNECTED to CONNECTED 1165 */ 1166 sp->pkt_hdr = neg->pkt->pkt_header; 1167 if (nonstandard) 1168 sp->pkt_hdr.eh.ether_type 1169 = ETHERTYPE_PPPOE_STUPID_SESS; 1170 else 1171 sp->pkt_hdr.eh.ether_type 1172 = ETHERTYPE_PPPOE_SESS; 1173 sp->pkt_hdr.ph.code = 0; 1174 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1175 break; 1176 case PADS_CODE: 1177 /* 1178 * We are a client: 1179 * Use the host_uniq tag to find the 1180 * hook this is in response to. 1181 * take the session ID and store it away. 1182 * Also make sure the pre-made header is 1183 * correct and set us into Session mode. 1184 */ 1185 utag = get_tag(ph, PTT_HOST_UNIQ); 1186 if ((utag == NULL) 1187 || (ntohs(utag->tag_len) != sizeof(sp))) { 1188 LEAVE (ENETUNREACH); 1189 break; 1190 } 1191 sendhook = pppoe_finduniq(node, utag); 1192 if (sendhook == NULL) { 1193 LEAVE(ENETUNREACH); 1194 } 1195 1196 /* 1197 * Check the session is in the right state. 1198 * It needs to be in PPPOE_SREQ. 1199 */ 1200 sp = NG_HOOK_PRIVATE(sendhook); 1201 if (sp->state != PPPOE_SREQ) { 1202 LEAVE(ENETUNREACH); 1203 } 1204 neg = sp->neg; 1205 untimeout(pppoe_ticker, sendhook, 1206 neg->timeout_handle); 1207 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1208 sp->Session_ID = ntohs(wh->ph.sid); 1209 neg->timeout = 0; 1210 sp->state = PPPOE_CONNECTED; 1211 /* 1212 * Now we have gone to Connected mode, 1213 * Free all resources needed for 1214 * negotiation. 1215 * Keep a copy of the header we will be using. 1216 */ 1217 sp->pkt_hdr = neg->pkt->pkt_header; 1218 if (nonstandard) 1219 sp->pkt_hdr.eh.ether_type 1220 = ETHERTYPE_PPPOE_STUPID_SESS; 1221 else 1222 sp->pkt_hdr.eh.ether_type 1223 = ETHERTYPE_PPPOE_SESS; 1224 sp->pkt_hdr.ph.code = 0; 1225 m_freem(neg->m); 1226 FREE(sp->neg, M_NETGRAPH_PPPOE); 1227 sp->neg = NULL; 1228 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1229 break; 1230 case PADT_CODE: 1231 /* 1232 * Send a 'close' message to the controlling 1233 * process (the one that set us up); 1234 * And then tear everything down. 1235 * 1236 * Find matching peer/session combination. 1237 */ 1238 sendhook = pppoe_findsession(node, wh); 1239 if (sendhook == NULL) { 1240 LEAVE(ENETUNREACH); 1241 } 1242 /* send message to creator */ 1243 /* close hook */ 1244 if (sendhook) { 1245 ng_rmhook_self(sendhook); 1246 } 1247 break; 1248 default: 1249 LEAVE(EPFNOSUPPORT); 1250 } 1251 break; 1252 case ETHERTYPE_PPPOE_STUPID_SESS: 1253 case ETHERTYPE_PPPOE_SESS: 1254 /* 1255 * find matching peer/session combination. 1256 */ 1257 sendhook = pppoe_findsession(node, wh); 1258 if (sendhook == NULL) { 1259 LEAVE (ENETUNREACH); 1260 break; 1261 } 1262 sp = NG_HOOK_PRIVATE(sendhook); 1263 m_adj(m, sizeof(*wh)); 1264 if (m->m_pkthdr.len < length) { 1265 /* Packet too short, dump it */ 1266 LEAVE(EMSGSIZE); 1267 } 1268 1269 /* Also need to trim excess at the end */ 1270 if (m->m_pkthdr.len > length) { 1271 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1272 } 1273 if ( sp->state != PPPOE_CONNECTED) { 1274 if (sp->state == PPPOE_NEWCONNECTED) { 1275 sp->state = PPPOE_CONNECTED; 1276 /* 1277 * Now we have gone to Connected mode, 1278 * Free all resources needed for 1279 * negotiation. Be paranoid about 1280 * whether there may be a timeout. 1281 */ 1282 m_freem(sp->neg->m); 1283 untimeout(pppoe_ticker, sendhook, 1284 sp->neg->timeout_handle); 1285 FREE(sp->neg, M_NETGRAPH_PPPOE); 1286 sp->neg = NULL; 1287 } else { 1288 LEAVE (ENETUNREACH); 1289 break; 1290 } 1291 } 1292 NG_FWD_NEW_DATA( error, item, sendhook, m); 1293 break; 1294 default: 1295 LEAVE(EPFNOSUPPORT); 1296 } 1297 } else { 1298 /* 1299 * Not ethernet or debug hook.. 1300 * 1301 * The packet has come in on a normal hook. 1302 * We need to find out what kind of hook, 1303 * So we can decide how to handle it. 1304 * Check the hook's state. 1305 */ 1306 sp = NG_HOOK_PRIVATE(hook); 1307 switch (sp->state) { 1308 case PPPOE_NEWCONNECTED: 1309 case PPPOE_CONNECTED: { 1310 static const u_char addrctrl[] = { 0xff, 0x03 }; 1311 struct pppoe_full_hdr *wh; 1312 1313 /* 1314 * Remove PPP address and control fields, if any. 1315 * For example, ng_ppp(4) always sends LCP packets 1316 * with address and control fields as required by 1317 * generic PPP. PPPoE is an exception to the rule. 1318 */ 1319 if (m->m_pkthdr.len >= 2) { 1320 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1321 LEAVE(ENOBUFS); 1322 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1323 m_adj(m, 2); 1324 } 1325 /* 1326 * Bang in a pre-made header, and set the length up 1327 * to be correct. Then send it to the ethernet driver. 1328 * But first correct the length. 1329 */ 1330 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1331 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1332 if (m == NULL) { 1333 LEAVE(ENOBUFS); 1334 } 1335 wh = mtod(m, struct pppoe_full_hdr *); 1336 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1337 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1338 privp->packets_out++; 1339 break; 1340 } 1341 case PPPOE_PRIMED: 1342 /* 1343 * A PADI packet is being returned by the application 1344 * that has set up this hook. This indicates that it 1345 * wants us to offer service. 1346 */ 1347 neg = sp->neg; 1348 if (m->m_len < sizeof(*wh)) { 1349 m = m_pullup(m, sizeof(*wh)); 1350 if (m == NULL) { 1351 LEAVE(ENOBUFS); 1352 } 1353 } 1354 wh = mtod(m, struct pppoe_full_hdr *); 1355 ph = &wh->ph; 1356 session = ntohs(wh->ph.sid); 1357 length = ntohs(wh->ph.length); 1358 code = wh->ph.code; 1359 if ( code != PADI_CODE) { 1360 LEAVE(EINVAL); 1361 }; 1362 untimeout(pppoe_ticker, hook, 1363 neg->timeout_handle); 1364 1365 /* 1366 * This is the first time we hear 1367 * from the client, so note it's 1368 * unicast address, replacing the 1369 * broadcast address. 1370 */ 1371 bcopy(wh->eh.ether_shost, 1372 neg->pkt->pkt_header.eh.ether_dhost, 1373 ETHER_ADDR_LEN); 1374 sp->state = PPPOE_SOFFER; 1375 neg->timeout = 0; 1376 neg->pkt->pkt_header.ph.code = PADO_CODE; 1377 1378 /* 1379 * start working out the tags to respond with. 1380 */ 1381 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1382 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1383 uniqtag.data.pointer = sp; 1384 init_tags(sp); 1385 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1386 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1387 insert_tag(sp, tag); /* return service */ 1388 /* 1389 * If we have a NULL service request 1390 * and have an extra service defined in this hook, 1391 * then also add a tag for the extra service. 1392 * XXX this is a hack. eventually we should be able 1393 * to support advertising many services, not just one 1394 */ 1395 if (((tag == NULL) || (tag->tag_len == 0)) 1396 && (neg->service.hdr.tag_len != 0)) { 1397 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1398 } 1399 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1400 insert_tag(sp, tag); /* returned hostunique */ 1401 insert_tag(sp, &uniqtag.hdr); 1402 scan_tags(sp, ph); 1403 make_packet(sp); 1404 sendpacket(sp); 1405 break; 1406 1407 /* 1408 * Packets coming from the hook make no sense 1409 * to sessions in these states. Throw them away. 1410 */ 1411 case PPPOE_SINIT: 1412 case PPPOE_SREQ: 1413 case PPPOE_SOFFER: 1414 case PPPOE_SNONE: 1415 case PPPOE_LISTENING: 1416 case PPPOE_DEAD: 1417 default: 1418 LEAVE(ENETUNREACH); 1419 } 1420 } 1421 quit: 1422 if (item) 1423 NG_FREE_ITEM(item); 1424 NG_FREE_M(m); 1425 return error; 1426 } 1427 1428 /* 1429 * Do local shutdown processing.. 1430 * If we are a persistant device, we might refuse to go away, and 1431 * we'd only remove our links and reset ourself. 1432 */ 1433 static int 1434 ng_pppoe_shutdown(node_p node) 1435 { 1436 const priv_p privdata = NG_NODE_PRIVATE(node); 1437 1438 AAA 1439 NG_NODE_SET_PRIVATE(node, NULL); 1440 NG_NODE_UNREF(privdata->node); 1441 FREE(privdata, M_NETGRAPH_PPPOE); 1442 return (0); 1443 } 1444 1445 /* 1446 * This is called once we've already connected a new hook to the other node. 1447 * It gives us a chance to balk at the last minute. 1448 */ 1449 static int 1450 ng_pppoe_connect(hook_p hook) 1451 { 1452 /* be really amiable and just say "YUP that's OK by me! " */ 1453 return (0); 1454 } 1455 1456 /* 1457 * Hook disconnection 1458 * 1459 * Clean up all dangling links and information about the session/hook. 1460 * For this type, removal of the last link destroys the node 1461 */ 1462 static int 1463 ng_pppoe_disconnect(hook_p hook) 1464 { 1465 node_p node = NG_HOOK_NODE(hook); 1466 priv_p privp = NG_NODE_PRIVATE(node); 1467 sessp sp; 1468 int hooks; 1469 1470 AAA 1471 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1472 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1473 privp->debug_hook = NULL; 1474 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1475 privp->ethernet_hook = NULL; 1476 if (NG_NODE_IS_VALID(node)) 1477 ng_rmnode_self(node); 1478 } else { 1479 sp = NG_HOOK_PRIVATE(hook); 1480 if (sp->state != PPPOE_SNONE ) { 1481 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1482 } 1483 /* 1484 * According to the spec, if we are connected, 1485 * we should send a DISC packet if we are shutting down 1486 * a session. 1487 */ 1488 if ((privp->ethernet_hook) 1489 && ((sp->state == PPPOE_CONNECTED) 1490 || (sp->state == PPPOE_NEWCONNECTED))) { 1491 struct mbuf *m; 1492 struct pppoe_full_hdr *wh; 1493 struct pppoe_tag *tag; 1494 int msglen = strlen(SIGNOFF); 1495 int error = 0; 1496 1497 /* revert the stored header to DISC/PADT mode */ 1498 wh = &sp->pkt_hdr; 1499 wh->ph.code = PADT_CODE; 1500 if (nonstandard) 1501 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1502 else 1503 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1504 1505 /* generate a packet of that type */ 1506 MGETHDR(m, M_DONTWAIT, MT_DATA); 1507 if(m == NULL) 1508 printf("pppoe: Session out of mbufs\n"); 1509 else { 1510 m->m_pkthdr.rcvif = NULL; 1511 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1512 bcopy((caddr_t)wh, mtod(m, caddr_t), 1513 sizeof(*wh)); 1514 /* 1515 * Add a General error message and adjust 1516 * sizes 1517 */ 1518 wh = mtod(m, struct pppoe_full_hdr *); 1519 tag = wh->ph.tag; 1520 tag->tag_type = PTT_GEN_ERR; 1521 tag->tag_len = htons((u_int16_t)msglen); 1522 strncpy(tag->tag_data, SIGNOFF, msglen); 1523 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1524 msglen); 1525 wh->ph.length = htons(sizeof(*tag) + msglen); 1526 NG_SEND_DATA_ONLY(error, 1527 privp->ethernet_hook, m); 1528 } 1529 } 1530 /* 1531 * As long as we have somewhere to store the timeout handle, 1532 * we may have a timeout pending.. get rid of it. 1533 */ 1534 if (sp->neg) { 1535 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1536 if (sp->neg->m) 1537 m_freem(sp->neg->m); 1538 FREE(sp->neg, M_NETGRAPH_PPPOE); 1539 } 1540 FREE(sp, M_NETGRAPH_PPPOE); 1541 NG_HOOK_SET_PRIVATE(hook, NULL); 1542 /* work out how many session hooks there are */ 1543 /* Node goes away on last session hook removal */ 1544 if (privp->ethernet_hook) hooks -= 1; 1545 if (privp->debug_hook) hooks -= 1; 1546 } 1547 if ((NG_NODE_NUMHOOKS(node) == 0) 1548 && (NG_NODE_IS_VALID(node))) 1549 ng_rmnode_self(node); 1550 return (0); 1551 } 1552 1553 /* 1554 * timeouts come here. 1555 */ 1556 static void 1557 pppoe_ticker(void *arg) 1558 { 1559 int s = splnet(); 1560 hook_p hook = arg; 1561 sessp sp = NG_HOOK_PRIVATE(hook); 1562 negp neg = sp->neg; 1563 int error = 0; 1564 struct mbuf *m0 = NULL; 1565 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1566 1567 AAA 1568 switch(sp->state) { 1569 /* 1570 * resend the last packet, using an exponential backoff. 1571 * After a period of time, stop growing the backoff, 1572 * and either leave it, or revert to the start. 1573 */ 1574 case PPPOE_SINIT: 1575 case PPPOE_SREQ: 1576 /* timeouts on these produce resends */ 1577 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1578 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1579 neg->timeout_handle = timeout(pppoe_ticker, 1580 hook, neg->timeout * hz); 1581 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1582 if (sp->state == PPPOE_SREQ) { 1583 /* revert to SINIT mode */ 1584 pppoe_start(sp); 1585 } else { 1586 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1587 } 1588 } 1589 break; 1590 case PPPOE_PRIMED: 1591 case PPPOE_SOFFER: 1592 /* a timeout on these says "give up" */ 1593 ng_rmhook_self(hook); 1594 break; 1595 default: 1596 /* timeouts have no meaning in other states */ 1597 printf("pppoe: unexpected timeout\n"); 1598 } 1599 splx(s); 1600 } 1601 1602 1603 static void 1604 sendpacket(sessp sp) 1605 { 1606 int error = 0; 1607 struct mbuf *m0 = NULL; 1608 hook_p hook = sp->hook; 1609 negp neg = sp->neg; 1610 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1611 1612 AAA 1613 switch(sp->state) { 1614 case PPPOE_LISTENING: 1615 case PPPOE_DEAD: 1616 case PPPOE_SNONE: 1617 case PPPOE_CONNECTED: 1618 printf("pppoe: sendpacket: unexpected state\n"); 1619 break; 1620 1621 case PPPOE_NEWCONNECTED: 1622 /* send the PADS without a timeout - we're now connected */ 1623 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1624 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1625 break; 1626 1627 case PPPOE_PRIMED: 1628 /* No packet to send, but set up the timeout */ 1629 neg->timeout_handle = timeout(pppoe_ticker, 1630 hook, PPPOE_OFFER_TIMEOUT * hz); 1631 break; 1632 1633 case PPPOE_SOFFER: 1634 /* 1635 * send the offer but if they don't respond 1636 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1637 */ 1638 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1639 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1640 neg->timeout_handle = timeout(pppoe_ticker, 1641 hook, PPPOE_OFFER_TIMEOUT * hz); 1642 break; 1643 1644 case PPPOE_SINIT: 1645 case PPPOE_SREQ: 1646 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1647 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1648 neg->timeout_handle = timeout(pppoe_ticker, hook, 1649 (hz * PPPOE_INITIAL_TIMEOUT)); 1650 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1651 break; 1652 1653 default: 1654 error = EINVAL; 1655 printf("pppoe: timeout: bad state\n"); 1656 } 1657 /* return (error); */ 1658 } 1659 1660 /* 1661 * Parse an incoming packet to see if any tags should be copied to the 1662 * output packet. Don't do any tags that have been handled in the main 1663 * state machine. 1664 */ 1665 static struct pppoe_tag* 1666 scan_tags(sessp sp, struct pppoe_hdr* ph) 1667 { 1668 char *end = (char *)next_tag(ph); 1669 char *ptn; 1670 struct pppoe_tag *pt = &ph->tag[0]; 1671 /* 1672 * Keep processing tags while a tag header will still fit. 1673 */ 1674 AAA 1675 while((char*)(pt + 1) <= end) { 1676 /* 1677 * If the tag data would go past the end of the packet, abort. 1678 */ 1679 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1680 if(ptn > end) 1681 return NULL; 1682 1683 switch (pt->tag_type) { 1684 case PTT_RELAY_SID: 1685 insert_tag(sp, pt); 1686 break; 1687 case PTT_EOL: 1688 return NULL; 1689 case PTT_SRV_NAME: 1690 case PTT_AC_NAME: 1691 case PTT_HOST_UNIQ: 1692 case PTT_AC_COOKIE: 1693 case PTT_VENDOR: 1694 case PTT_SRV_ERR: 1695 case PTT_SYS_ERR: 1696 case PTT_GEN_ERR: 1697 break; 1698 } 1699 pt = (struct pppoe_tag*)ptn; 1700 } 1701 return NULL; 1702 } 1703 1704 static int 1705 pppoe_send_event(sessp sp, enum cmd cmdid) 1706 { 1707 int error; 1708 struct ng_mesg *msg; 1709 struct ngpppoe_sts *sts; 1710 1711 AAA 1712 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1713 sizeof(struct ngpppoe_sts), M_NOWAIT); 1714 if (msg == NULL) 1715 return (ENOMEM); 1716 sts = (struct ngpppoe_sts *)msg->data; 1717 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKLEN + 1); 1718 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL); 1719 return (error); 1720 } 1721