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 <sys/syslog.h> 58 #include <net/ethernet.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include <netgraph/ng_parse.h> 63 #include <netgraph/ng_pppoe.h> 64 65 #ifdef NG_SEPARATE_MALLOC 66 MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 67 #else 68 #define M_NETGRAPH_PPPOE M_NETGRAPH 69 #endif 70 71 #define SIGNOFF "session closed" 72 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 73 74 /* 75 * This section contains the netgraph method declarations for the 76 * pppoe node. These methods define the netgraph pppoe 'type'. 77 */ 78 79 static ng_constructor_t ng_pppoe_constructor; 80 static ng_rcvmsg_t ng_pppoe_rcvmsg; 81 static ng_shutdown_t ng_pppoe_shutdown; 82 static ng_newhook_t ng_pppoe_newhook; 83 static ng_connect_t ng_pppoe_connect; 84 static ng_rcvdata_t ng_pppoe_rcvdata; 85 static ng_disconnect_t ng_pppoe_disconnect; 86 87 /* Parse type for struct ngpppoe_init_data */ 88 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 89 = NG_PPPOE_INIT_DATA_TYPE_INFO; 90 static const struct ng_parse_type ngpppoe_init_data_state_type = { 91 &ng_parse_struct_type, 92 &ngpppoe_init_data_type_fields 93 }; 94 95 /* Parse type for struct ngpppoe_sts */ 96 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 97 = NG_PPPOE_STS_TYPE_INFO; 98 static const struct ng_parse_type ng_pppoe_sts_state_type = { 99 &ng_parse_struct_type, 100 &ng_pppoe_sts_type_fields 101 }; 102 103 /* List of commands and how to convert arguments to/from ASCII */ 104 static const struct ng_cmdlist ng_pppoe_cmds[] = { 105 { 106 NGM_PPPOE_COOKIE, 107 NGM_PPPOE_CONNECT, 108 "pppoe_connect", 109 &ngpppoe_init_data_state_type, 110 NULL 111 }, 112 { 113 NGM_PPPOE_COOKIE, 114 NGM_PPPOE_LISTEN, 115 "pppoe_listen", 116 &ngpppoe_init_data_state_type, 117 NULL 118 }, 119 { 120 NGM_PPPOE_COOKIE, 121 NGM_PPPOE_OFFER, 122 "pppoe_offer", 123 &ngpppoe_init_data_state_type, 124 NULL 125 }, 126 { 127 NGM_PPPOE_COOKIE, 128 NGM_PPPOE_SERVICE, 129 "pppoe_service", 130 &ngpppoe_init_data_state_type, 131 NULL 132 }, 133 { 134 NGM_PPPOE_COOKIE, 135 NGM_PPPOE_SUCCESS, 136 "pppoe_success", 137 &ng_pppoe_sts_state_type, 138 NULL 139 }, 140 { 141 NGM_PPPOE_COOKIE, 142 NGM_PPPOE_FAIL, 143 "pppoe_fail", 144 &ng_pppoe_sts_state_type, 145 NULL 146 }, 147 { 148 NGM_PPPOE_COOKIE, 149 NGM_PPPOE_CLOSE, 150 "pppoe_close", 151 &ng_pppoe_sts_state_type, 152 NULL 153 }, 154 { 0 } 155 }; 156 157 /* Netgraph node type descriptor */ 158 static struct ng_type typestruct = { 159 .version = NG_ABI_VERSION, 160 .name = NG_PPPOE_NODE_TYPE, 161 .constructor = ng_pppoe_constructor, 162 .rcvmsg = ng_pppoe_rcvmsg, 163 .shutdown = ng_pppoe_shutdown, 164 .newhook = ng_pppoe_newhook, 165 .connect = ng_pppoe_connect, 166 .rcvdata = ng_pppoe_rcvdata, 167 .disconnect = ng_pppoe_disconnect, 168 .cmdlist = ng_pppoe_cmds, 169 }; 170 NETGRAPH_INIT(pppoe, &typestruct); 171 /* Depend on ng_ether so we can use the Ethernet parse type */ 172 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1); 173 174 /* 175 * States for the session state machine. 176 * These have no meaning if there is no hook attached yet. 177 */ 178 enum state { 179 PPPOE_SNONE=0, /* [both] Initial state */ 180 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 181 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 182 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 183 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 184 PPPOE_SREQ, /* [Client] Sent a Request */ 185 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 186 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 187 PPPOE_DEAD /* [Both] */ 188 }; 189 190 #define NUMTAGS 20 /* number of tags we are set up to work with */ 191 192 /* 193 * Information we store for each hook on each node for negotiating the 194 * session. The mbuf and cluster are freed once negotiation has completed. 195 * The whole negotiation block is then discarded. 196 */ 197 198 struct sess_neg { 199 struct mbuf *m; /* holds cluster with last sent packet */ 200 union packet *pkt; /* points within the above cluster */ 201 struct callout_handle timeout_handle; /* see timeout(9) */ 202 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 203 u_int numtags; 204 const struct pppoe_tag *tags[NUMTAGS]; 205 u_int service_len; 206 u_int ac_name_len; 207 208 struct datatag service; 209 struct datatag ac_name; 210 }; 211 typedef struct sess_neg *negp; 212 213 /* 214 * Session information that is needed after connection. 215 */ 216 struct sess_con { 217 hook_p hook; 218 u_int16_t Session_ID; 219 enum state state; 220 ng_ID_t creator; /* who to notify */ 221 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 222 negp neg; /* used when negotiating */ 223 /*struct sess_con *hash_next;*/ /* not yet used */ 224 }; 225 typedef struct sess_con *sessp; 226 227 /* 228 * Information we store for each node 229 */ 230 struct PPPOE { 231 node_p node; /* back pointer to node */ 232 hook_p ethernet_hook; 233 hook_p debug_hook; 234 u_int packets_in; /* packets in from ethernet */ 235 u_int packets_out; /* packets out towards ethernet */ 236 u_int32_t flags; 237 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 238 }; 239 typedef struct PPPOE *priv_p; 240 241 struct ether_header eh_prototype = 242 {{0xff,0xff,0xff,0xff,0xff,0xff}, 243 {0x00,0x00,0x00,0x00,0x00,0x00}, 244 ETHERTYPE_PPPOE_DISC}; 245 246 #define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */ 247 #define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */ 248 #define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */ 249 static int pppoe_mode = PPPOE_KEEPSTANDARD; 250 251 static int 252 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 253 { 254 int error; 255 int val; 256 257 val = pppoe_mode; 258 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 259 if (error != 0 || req->newptr == NULL) 260 return (error); 261 switch (val) { 262 case PPPOE_NONSTANDARD: 263 pppoe_mode = PPPOE_NONSTANDARD; 264 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 265 break; 266 case PPPOE_STANDARD: 267 pppoe_mode = PPPOE_STANDARD; 268 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 269 break; 270 case PPPOE_KEEPSTANDARD: 271 pppoe_mode = PPPOE_KEEPSTANDARD; 272 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC; 273 break; 274 default: 275 return (EINVAL); 276 } 277 return (0); 278 } 279 280 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 281 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP"); 282 283 union uniq { 284 char bytes[sizeof(void *)]; 285 void * pointer; 286 }; 287 288 #define LEAVE(x) do { error = x; goto quit; } while(0) 289 static void pppoe_start(sessp sp); 290 static void sendpacket(sessp sp); 291 static void pppoe_ticker(void *arg); 292 static const struct pppoe_tag *scan_tags(sessp sp, 293 const struct pppoe_hdr* ph); 294 static int pppoe_send_event(sessp sp, enum cmd cmdid); 295 296 /************************************************************************* 297 * Some basic utilities from the Linux version with author's permission.* 298 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 299 ************************************************************************/ 300 301 /* 302 * Generate a new session id 303 * XXX find out the FreeBSD locking scheme. 304 */ 305 static u_int16_t 306 get_new_sid(node_p node) 307 { 308 static int pppoe_sid = 10; 309 sessp sp; 310 hook_p hook; 311 u_int16_t val; 312 priv_p privp = NG_NODE_PRIVATE(node); 313 314 AAA 315 restart: 316 val = pppoe_sid++; 317 /* 318 * Spec says 0xFFFF is reserved. 319 * Also don't use 0x0000 320 */ 321 if (val == 0xffff) { 322 pppoe_sid = 20; 323 goto restart; 324 } 325 326 /* Check it isn't already in use */ 327 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 328 /* don't check special hooks */ 329 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 330 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 331 continue; 332 sp = NG_HOOK_PRIVATE(hook); 333 if (sp->Session_ID == val) 334 goto restart; 335 } 336 337 return val; 338 } 339 340 341 /* 342 * Return the location where the next tag can be put 343 */ 344 static __inline const struct pppoe_tag* 345 next_tag(const struct pppoe_hdr* ph) 346 { 347 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 348 + ntohs(ph->length)); 349 } 350 351 /* 352 * Look for a tag of a specific type 353 * Don't trust any length the other end says. 354 * but assume we already sanity checked ph->length. 355 */ 356 static const struct pppoe_tag* 357 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 358 { 359 const char *const end = (const char *)next_tag(ph); 360 const char *ptn; 361 const struct pppoe_tag *pt = &ph->tag[0]; 362 /* 363 * Keep processing tags while a tag header will still fit. 364 */ 365 AAA 366 while((const char*)(pt + 1) <= end) { 367 /* 368 * If the tag data would go past the end of the packet, abort. 369 */ 370 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 371 if(ptn > end) 372 return NULL; 373 374 if(pt->tag_type == idx) 375 return pt; 376 377 pt = (const struct pppoe_tag*)ptn; 378 } 379 return NULL; 380 } 381 382 /************************************************************************** 383 * inlines to initialise or add tags to a session's tag list, 384 **************************************************************************/ 385 /* 386 * Initialise the session's tag list 387 */ 388 static void 389 init_tags(sessp sp) 390 { 391 AAA 392 if(sp->neg == NULL) { 393 printf("pppoe: asked to init NULL neg pointer\n"); 394 return; 395 } 396 sp->neg->numtags = 0; 397 } 398 399 static void 400 insert_tag(sessp sp, const struct pppoe_tag *tp) 401 { 402 int i; 403 negp neg; 404 405 AAA 406 if((neg = sp->neg) == NULL) { 407 printf("pppoe: asked to use NULL neg pointer\n"); 408 return; 409 } 410 if ((i = neg->numtags++) < NUMTAGS) { 411 neg->tags[i] = tp; 412 } else { 413 printf("pppoe: asked to add too many tags to packet\n"); 414 neg->numtags--; 415 } 416 } 417 418 /* 419 * Make up a packet, using the tags filled out for the session. 420 * 421 * Assume that the actual pppoe header and ethernet header 422 * are filled out externally to this routine. 423 * Also assume that neg->wh points to the correct 424 * location at the front of the buffer space. 425 */ 426 static void 427 make_packet(sessp sp) { 428 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 429 const struct pppoe_tag **tag; 430 char *dp; 431 int count; 432 int tlen; 433 u_int16_t length = 0; 434 435 AAA 436 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 437 printf("pppoe: make_packet called from wrong state\n"); 438 } 439 dp = (char *)wh->ph.tag; 440 for (count = 0, tag = sp->neg->tags; 441 ((count < sp->neg->numtags) && (count < NUMTAGS)); 442 tag++, count++) { 443 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 444 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 445 printf("pppoe: tags too long\n"); 446 sp->neg->numtags = count; 447 break; /* XXX chop off what's too long */ 448 } 449 bcopy(*tag, (char *)dp, tlen); 450 length += tlen; 451 dp += tlen; 452 } 453 wh->ph.length = htons(length); 454 sp->neg->m->m_len = length + sizeof(*wh); 455 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 456 } 457 458 /************************************************************************** 459 * Routine to match a service offered * 460 **************************************************************************/ 461 /* 462 * Find a hook that has a service string that matches that 463 * we are seeking. for now use a simple string. 464 * In the future we may need something like regexp(). 465 * for testing allow a null string to match 1st found and a null service 466 * to match all requests. Also make '*' do the same. 467 */ 468 469 #define NG_MATCH_EXACT 1 470 #define NG_MATCH_ANY 2 471 472 static hook_p 473 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 474 { 475 sessp sp = NULL; 476 negp neg = NULL; 477 priv_p privp = NG_NODE_PRIVATE(node); 478 hook_p allhook = NULL; 479 hook_p hook; 480 481 AAA 482 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 483 484 /* skip any hook that is debug or ethernet */ 485 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 486 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 487 continue; 488 sp = NG_HOOK_PRIVATE(hook); 489 490 /* Skip any sessions which are not in LISTEN mode. */ 491 if ( sp->state != PPPOE_LISTENING) 492 continue; 493 494 neg = sp->neg; 495 496 /* Special case for a blank or "*" service name (wildcard) */ 497 if (match == NG_MATCH_ANY && neg->service_len == 1 && 498 neg->service.data[0] == '*') { 499 allhook = hook; 500 continue; 501 } 502 503 /* If the lengths don't match, that aint it. */ 504 if (neg->service_len != svc_len) 505 continue; 506 507 /* An exact match? */ 508 if (svc_len == 0) 509 break; 510 511 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 512 break; 513 } 514 return (hook ? hook : allhook); 515 } 516 /************************************************************************** 517 * Routine to find a particular session that matches an incoming packet * 518 **************************************************************************/ 519 static hook_p 520 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 521 { 522 sessp sp = NULL; 523 hook_p hook = NULL; 524 priv_p privp = NG_NODE_PRIVATE(node); 525 u_int16_t session = ntohs(wh->ph.sid); 526 527 /* 528 * find matching peer/session combination. 529 */ 530 AAA 531 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 532 /* don't check special hooks */ 533 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 534 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 535 continue; 536 } 537 sp = NG_HOOK_PRIVATE(hook); 538 if ( ( (sp->state == PPPOE_CONNECTED) 539 || (sp->state == PPPOE_NEWCONNECTED) ) 540 && (sp->Session_ID == session) 541 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 542 wh->eh.ether_shost, 543 ETHER_ADDR_LEN)) == 0) { 544 break; 545 } 546 } 547 return (hook); 548 } 549 550 static hook_p 551 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 552 { 553 hook_p hook = NULL; 554 priv_p privp = NG_NODE_PRIVATE(node); 555 union uniq uniq; 556 557 AAA 558 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 559 /* cycle through all known hooks */ 560 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 561 /* don't check special hooks */ 562 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 563 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 564 continue; 565 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 566 break; 567 } 568 return (hook); 569 } 570 571 /************************************************************************** 572 * start of Netgraph entrypoints * 573 **************************************************************************/ 574 575 /* 576 * Allocate the private data structure and the generic node 577 * and link them together. 578 * 579 * ng_make_node_common() returns with a generic node struct 580 * with a single reference for us.. we transfer it to the 581 * private structure.. when we free the private struct we must 582 * unref the node so it gets freed too. 583 */ 584 static int 585 ng_pppoe_constructor(node_p node) 586 { 587 priv_p privdata; 588 589 AAA 590 /* Initialize private descriptor */ 591 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 592 M_NOWAIT | M_ZERO); 593 if (privdata == NULL) 594 return (ENOMEM); 595 596 /* Link structs together; this counts as our one reference to *nodep */ 597 NG_NODE_SET_PRIVATE(node, privdata); 598 privdata->node = node; 599 return (0); 600 } 601 602 /* 603 * Give our ok for a hook to be added... 604 * point the hook's private info to the hook structure. 605 * 606 * The following hook names are special: 607 * Ethernet: the hook that should be connected to a NIC. 608 * debug: copies of data sent out here (when I write the code). 609 * All other hook names need only be unique. (the framework checks this). 610 */ 611 static int 612 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 613 { 614 const priv_p privp = NG_NODE_PRIVATE(node); 615 sessp sp; 616 617 AAA 618 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 619 privp->ethernet_hook = hook; 620 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 621 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 622 privp->debug_hook = hook; 623 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 624 } else { 625 /* 626 * Any other unique name is OK. 627 * The infrastructure has already checked that it's unique, 628 * so just allocate it and hook it in. 629 */ 630 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 631 if (sp == NULL) { 632 return (ENOMEM); 633 } 634 635 NG_HOOK_SET_PRIVATE(hook, sp); 636 sp->hook = hook; 637 } 638 return(0); 639 } 640 641 /* 642 * Get a netgraph control message. 643 * Check it is one we understand. If needed, send a response. 644 * We sometimes save the address for an async action later. 645 * Always free the message. 646 */ 647 static int 648 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 649 { 650 priv_p privp = NG_NODE_PRIVATE(node); 651 struct ngpppoe_init_data *ourmsg = NULL; 652 struct ng_mesg *resp = NULL; 653 int error = 0; 654 hook_p hook = NULL; 655 sessp sp = NULL; 656 negp neg = NULL; 657 struct ng_mesg *msg; 658 659 AAA 660 NGI_GET_MSG(item, msg); 661 /* Deal with message according to cookie and command */ 662 switch (msg->header.typecookie) { 663 case NGM_PPPOE_COOKIE: 664 switch (msg->header.cmd) { 665 case NGM_PPPOE_CONNECT: 666 case NGM_PPPOE_LISTEN: 667 case NGM_PPPOE_OFFER: 668 case NGM_PPPOE_SERVICE: 669 ourmsg = (struct ngpppoe_init_data *)msg->data; 670 if (msg->header.arglen < sizeof(*ourmsg)) { 671 printf("pppoe: init data too small\n"); 672 LEAVE(EMSGSIZE); 673 } 674 if (msg->header.arglen - sizeof(*ourmsg) > 675 PPPOE_SERVICE_NAME_SIZE) { 676 printf("pppoe_rcvmsg: service name too big"); 677 LEAVE(EMSGSIZE); 678 } 679 if (msg->header.arglen - sizeof(*ourmsg) < 680 ourmsg->data_len) { 681 printf("pppoe: init data has bad length," 682 " %d should be %zd\n", ourmsg->data_len, 683 msg->header.arglen - sizeof (*ourmsg)); 684 LEAVE(EMSGSIZE); 685 } 686 687 /* make sure strcmp will terminate safely */ 688 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 689 690 /* cycle through all known hooks */ 691 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 692 if (NG_HOOK_NAME(hook) 693 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 694 break; 695 } 696 if (hook == NULL) { 697 LEAVE(ENOENT); 698 } 699 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 700 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 701 LEAVE(EINVAL); 702 } 703 sp = NG_HOOK_PRIVATE(hook); 704 705 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 706 /* 707 * Ensure we aren't already listening for this 708 * service. 709 */ 710 if (pppoe_match_svc(node, ourmsg->data, 711 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 712 LEAVE(EEXIST); 713 } 714 } 715 716 /* 717 * PPPOE_SERVICE advertisments are set up 718 * on sessions that are in PRIMED state. 719 */ 720 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 721 break; 722 } 723 if (sp->state |= PPPOE_SNONE) { 724 printf("pppoe: Session already active\n"); 725 LEAVE(EISCONN); 726 } 727 728 /* 729 * set up prototype header 730 */ 731 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 732 M_NOWAIT | M_ZERO); 733 734 if (neg == NULL) { 735 printf("pppoe: Session out of memory\n"); 736 LEAVE(ENOMEM); 737 } 738 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 739 if(neg->m == NULL) { 740 printf("pppoe: Session out of mbufs\n"); 741 FREE(neg, M_NETGRAPH_PPPOE); 742 LEAVE(ENOBUFS); 743 } 744 neg->m->m_pkthdr.rcvif = NULL; 745 MCLGET(neg->m, M_DONTWAIT); 746 if ((neg->m->m_flags & M_EXT) == 0) { 747 printf("pppoe: Session out of mcls\n"); 748 m_freem(neg->m); 749 FREE(neg, M_NETGRAPH_PPPOE); 750 LEAVE(ENOBUFS); 751 } 752 sp->neg = neg; 753 callout_handle_init( &neg->timeout_handle); 754 neg->m->m_len = sizeof(struct pppoe_full_hdr); 755 neg->pkt = mtod(neg->m, union packet*); 756 neg->pkt->pkt_header.eh = eh_prototype; 757 neg->pkt->pkt_header.ph.ver = 0x1; 758 neg->pkt->pkt_header.ph.type = 0x1; 759 neg->pkt->pkt_header.ph.sid = 0x0000; 760 neg->timeout = 0; 761 762 sp->creator = NGI_RETADDR(item); 763 } 764 switch (msg->header.cmd) { 765 case NGM_PPPOE_GET_STATUS: 766 { 767 struct ngpppoestat *stats; 768 769 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 770 if (!resp) { 771 LEAVE(ENOMEM); 772 } 773 stats = (struct ngpppoestat *) resp->data; 774 stats->packets_in = privp->packets_in; 775 stats->packets_out = privp->packets_out; 776 break; 777 } 778 case NGM_PPPOE_CONNECT: 779 /* 780 * Check the hook exists and is Uninitialised. 781 * Send a PADI request, and start the timeout logic. 782 * Store the originator of this message so we can send 783 * a success of fail message to them later. 784 * Move the session to SINIT 785 * Set up the session to the correct state and 786 * start it. 787 */ 788 neg->service.hdr.tag_type = PTT_SRV_NAME; 789 neg->service.hdr.tag_len = 790 htons((u_int16_t)ourmsg->data_len); 791 if (ourmsg->data_len) 792 bcopy(ourmsg->data, neg->service.data, 793 ourmsg->data_len); 794 neg->service_len = ourmsg->data_len; 795 pppoe_start(sp); 796 break; 797 case NGM_PPPOE_LISTEN: 798 /* 799 * Check the hook exists and is Uninitialised. 800 * Install the service matching string. 801 * Store the originator of this message so we can send 802 * a success of fail message to them later. 803 * Move the hook to 'LISTENING' 804 */ 805 neg->service.hdr.tag_type = PTT_SRV_NAME; 806 neg->service.hdr.tag_len = 807 htons((u_int16_t)ourmsg->data_len); 808 809 if (ourmsg->data_len) 810 bcopy(ourmsg->data, neg->service.data, 811 ourmsg->data_len); 812 neg->service_len = ourmsg->data_len; 813 neg->pkt->pkt_header.ph.code = PADT_CODE; 814 /* 815 * wait for PADI packet coming from ethernet 816 */ 817 sp->state = PPPOE_LISTENING; 818 break; 819 case NGM_PPPOE_OFFER: 820 /* 821 * Check the hook exists and is Uninitialised. 822 * Store the originator of this message so we can send 823 * a success of fail message to them later. 824 * Store the AC-Name given and go to PRIMED. 825 */ 826 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 827 neg->ac_name.hdr.tag_len = 828 htons((u_int16_t)ourmsg->data_len); 829 if (ourmsg->data_len) 830 bcopy(ourmsg->data, neg->ac_name.data, 831 ourmsg->data_len); 832 neg->ac_name_len = ourmsg->data_len; 833 neg->pkt->pkt_header.ph.code = PADO_CODE; 834 /* 835 * Wait for PADI packet coming from hook 836 */ 837 sp->state = PPPOE_PRIMED; 838 break; 839 case NGM_PPPOE_SERVICE: 840 /* 841 * Check the session is primed. 842 * for now just allow ONE service to be advertised. 843 * If you do it twice you just overwrite. 844 */ 845 if (sp->state != PPPOE_PRIMED) { 846 printf("pppoe: Session not primed\n"); 847 LEAVE(EISCONN); 848 } 849 neg = sp->neg; 850 neg->service.hdr.tag_type = PTT_SRV_NAME; 851 neg->service.hdr.tag_len = 852 htons((u_int16_t)ourmsg->data_len); 853 854 if (ourmsg->data_len) 855 bcopy(ourmsg->data, neg->service.data, 856 ourmsg->data_len); 857 neg->service_len = ourmsg->data_len; 858 break; 859 default: 860 LEAVE(EINVAL); 861 } 862 break; 863 default: 864 LEAVE(EINVAL); 865 } 866 867 /* Take care of synchronous response, if any */ 868 quit: 869 NG_RESPOND_MSG(error, node, item, resp); 870 /* Free the message and return */ 871 NG_FREE_MSG(msg); 872 return(error); 873 } 874 875 /* 876 * Start a client into the first state. A separate function because 877 * it can be needed if the negotiation times out. 878 */ 879 static void 880 pppoe_start(sessp sp) 881 { 882 struct { 883 struct pppoe_tag hdr; 884 union uniq data; 885 } __packed uniqtag; 886 887 /* 888 * kick the state machine into starting up 889 */ 890 AAA 891 sp->state = PPPOE_SINIT; 892 /* reset the packet header to broadcast */ 893 sp->neg->pkt->pkt_header.eh = eh_prototype; 894 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 895 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 896 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 897 uniqtag.data.pointer = sp; 898 init_tags(sp); 899 insert_tag(sp, &uniqtag.hdr); 900 insert_tag(sp, &sp->neg->service.hdr); 901 make_packet(sp); 902 sendpacket(sp); 903 } 904 905 static int 906 send_acname(sessp sp, const struct pppoe_tag *tag) 907 { 908 int error, tlen; 909 struct ng_mesg *msg; 910 struct ngpppoe_sts *sts; 911 912 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 913 sizeof(struct ngpppoe_sts), M_NOWAIT); 914 if (msg == NULL) 915 return (ENOMEM); 916 917 sts = (struct ngpppoe_sts *)msg->data; 918 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 919 strncpy(sts->hook, tag->tag_data, tlen); 920 sts->hook[tlen] = '\0'; 921 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 922 923 return (error); 924 } 925 926 static int 927 send_sessionid(sessp sp) 928 { 929 int error; 930 struct ng_mesg *msg; 931 932 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 933 sizeof(u_int16_t), M_NOWAIT); 934 if (msg == NULL) 935 return (ENOMEM); 936 937 *(u_int16_t *)msg->data = sp->Session_ID; 938 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 939 940 return (error); 941 } 942 943 /* 944 * Receive data, and do something with it. 945 * The caller will never free m, so if we use up this data 946 * or abort we must free it. 947 */ 948 static int 949 ng_pppoe_rcvdata(hook_p hook, item_p item) 950 { 951 node_p node = NG_HOOK_NODE(hook); 952 const priv_p privp = NG_NODE_PRIVATE(node); 953 sessp sp = NG_HOOK_PRIVATE(hook); 954 const struct pppoe_full_hdr *wh; 955 const struct pppoe_hdr *ph; 956 int error = 0; 957 u_int16_t session; 958 u_int16_t length; 959 u_int8_t code; 960 const struct pppoe_tag *utag = NULL, *tag = NULL; 961 hook_p sendhook; 962 struct { 963 struct pppoe_tag hdr; 964 union uniq data; 965 } __packed uniqtag; 966 negp neg = NULL; 967 struct mbuf *m; 968 969 AAA 970 NGI_GET_M(item, m); 971 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 972 /* 973 * Data from the debug hook gets sent without modification 974 * straight to the ethernet. 975 */ 976 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 977 privp->packets_out++; 978 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 979 /* 980 * Incoming data. 981 * Dig out various fields from the packet. 982 * use them to decide where to send it. 983 */ 984 985 privp->packets_in++; 986 if( m->m_len < sizeof(*wh)) { 987 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 988 if (m == NULL) { 989 printf("couldn't m_pullup\n"); 990 LEAVE(ENOBUFS); 991 } 992 } 993 wh = mtod(m, struct pppoe_full_hdr *); 994 length = ntohs(wh->ph.length); 995 switch(wh->eh.ether_type) { 996 case ETHERTYPE_PPPOE_STUPID_DISC: 997 if (pppoe_mode == PPPOE_STANDARD) { 998 pppoe_mode = PPPOE_NONSTANDARD; 999 eh_prototype.ether_type = 1000 ETHERTYPE_PPPOE_STUPID_DISC; 1001 log(LOG_NOTICE, 1002 "Switched to nonstandard PPPoE mode due to " 1003 "packet from %*D\n", 1004 ETHER_ADDR_LEN, 1005 wh->eh.ether_shost, ":"); 1006 } else if (pppoe_mode == PPPOE_KEEPSTANDARD) 1007 log(LOG_NOTICE, 1008 "Ignored nonstandard PPPoE packet " 1009 "from %*D\n", 1010 ETHER_ADDR_LEN, 1011 wh->eh.ether_shost, ":"); 1012 /* fall through */ 1013 case ETHERTYPE_PPPOE_DISC: 1014 /* 1015 * We need to try to make sure that the tag area 1016 * is contiguous, or we could wander off the end 1017 * of a buffer and make a mess. 1018 * (Linux wouldn't have this problem). 1019 */ 1020 if (m->m_pkthdr.len <= MHLEN) { 1021 if( m->m_len < m->m_pkthdr.len) { 1022 m = m_pullup(m, m->m_pkthdr.len); 1023 if (m == NULL) { 1024 printf("couldn't m_pullup\n"); 1025 LEAVE(ENOBUFS); 1026 } 1027 } 1028 } 1029 if (m->m_len != m->m_pkthdr.len) { 1030 /* 1031 * It's not all in one piece. 1032 * We need to do extra work. 1033 * Put it into a cluster. 1034 */ 1035 struct mbuf *n; 1036 n = m_dup(m, M_DONTWAIT); 1037 m_freem(m); 1038 m = n; 1039 if (m) { 1040 /* just check we got a cluster */ 1041 if (m->m_len != m->m_pkthdr.len) { 1042 m_freem(m); 1043 m = NULL; 1044 } 1045 } 1046 if (m == NULL) { 1047 printf("packet fragmented\n"); 1048 LEAVE(EMSGSIZE); 1049 } 1050 } 1051 wh = mtod(m, struct pppoe_full_hdr *); 1052 length = ntohs(wh->ph.length); 1053 ph = &wh->ph; 1054 session = ntohs(wh->ph.sid); 1055 code = wh->ph.code; 1056 1057 switch(code) { 1058 case PADI_CODE: 1059 /* 1060 * We are a server: 1061 * Look for a hook with the required service 1062 * and send the ENTIRE packet up there. 1063 * It should come back to a new hook in 1064 * PRIMED state. Look there for further 1065 * processing. 1066 */ 1067 tag = get_tag(ph, PTT_SRV_NAME); 1068 if (tag == NULL) { 1069 printf("no service tag\n"); 1070 LEAVE(ENETUNREACH); 1071 } 1072 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1073 tag->tag_data, ntohs(tag->tag_len), 1074 NG_MATCH_ANY); 1075 if (sendhook) { 1076 NG_FWD_NEW_DATA(error, item, 1077 sendhook, m); 1078 } else { 1079 LEAVE(ENETUNREACH); 1080 } 1081 break; 1082 case PADO_CODE: 1083 /* 1084 * We are a client: 1085 * Use the host_uniq tag to find the 1086 * hook this is in response to. 1087 * Received #2, now send #3 1088 * For now simply accept the first we receive. 1089 */ 1090 utag = get_tag(ph, PTT_HOST_UNIQ); 1091 if ((utag == NULL) 1092 || (ntohs(utag->tag_len) != sizeof(sp))) { 1093 printf("no host unique field\n"); 1094 LEAVE(ENETUNREACH); 1095 } 1096 1097 sendhook = pppoe_finduniq(node, utag); 1098 if (sendhook == NULL) { 1099 printf("no matching session\n"); 1100 LEAVE(ENETUNREACH); 1101 } 1102 1103 /* 1104 * Check the session is in the right state. 1105 * It needs to be in PPPOE_SINIT. 1106 */ 1107 sp = NG_HOOK_PRIVATE(sendhook); 1108 if (sp->state != PPPOE_SINIT) { 1109 printf("session in wrong state\n"); 1110 LEAVE(ENETUNREACH); 1111 } 1112 neg = sp->neg; 1113 untimeout(pppoe_ticker, sendhook, 1114 neg->timeout_handle); 1115 1116 /* 1117 * This is the first time we hear 1118 * from the server, so note it's 1119 * unicast address, replacing the 1120 * broadcast address . 1121 */ 1122 bcopy(wh->eh.ether_shost, 1123 neg->pkt->pkt_header.eh.ether_dhost, 1124 ETHER_ADDR_LEN); 1125 neg->timeout = 0; 1126 neg->pkt->pkt_header.ph.code = PADR_CODE; 1127 init_tags(sp); 1128 insert_tag(sp, utag); /* Host Unique */ 1129 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1130 insert_tag(sp, tag); /* return cookie */ 1131 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1132 insert_tag(sp, tag); /* return it */ 1133 send_acname(sp, tag); 1134 } 1135 insert_tag(sp, &neg->service.hdr); /* Service */ 1136 scan_tags(sp, ph); 1137 make_packet(sp); 1138 sp->state = PPPOE_SREQ; 1139 sendpacket(sp); 1140 break; 1141 case PADR_CODE: 1142 1143 /* 1144 * We are a server: 1145 * Use the ac_cookie tag to find the 1146 * hook this is in response to. 1147 */ 1148 utag = get_tag(ph, PTT_AC_COOKIE); 1149 if ((utag == NULL) 1150 || (ntohs(utag->tag_len) != sizeof(sp))) { 1151 LEAVE(ENETUNREACH); 1152 } 1153 1154 sendhook = pppoe_finduniq(node, utag); 1155 if (sendhook == NULL) { 1156 LEAVE(ENETUNREACH); 1157 } 1158 1159 /* 1160 * Check the session is in the right state. 1161 * It needs to be in PPPOE_SOFFER 1162 * or PPPOE_NEWCONNECTED. If the latter, 1163 * then this is a retry by the client. 1164 * so be nice, and resend. 1165 */ 1166 sp = NG_HOOK_PRIVATE(sendhook); 1167 if (sp->state == PPPOE_NEWCONNECTED) { 1168 /* 1169 * Whoa! drop back to resend that 1170 * PADS packet. 1171 * We should still have a copy of it. 1172 */ 1173 sp->state = PPPOE_SOFFER; 1174 } 1175 if (sp->state != PPPOE_SOFFER) { 1176 LEAVE (ENETUNREACH); 1177 break; 1178 } 1179 neg = sp->neg; 1180 untimeout(pppoe_ticker, sendhook, 1181 neg->timeout_handle); 1182 neg->pkt->pkt_header.ph.code = PADS_CODE; 1183 if (sp->Session_ID == 0) 1184 neg->pkt->pkt_header.ph.sid = 1185 htons(sp->Session_ID 1186 = get_new_sid(node)); 1187 send_sessionid(sp); 1188 neg->timeout = 0; 1189 /* 1190 * start working out the tags to respond with. 1191 */ 1192 init_tags(sp); 1193 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1194 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1195 insert_tag(sp, tag);/* return service */ 1196 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1197 insert_tag(sp, tag); /* return it */ 1198 insert_tag(sp, utag); /* ac_cookie */ 1199 scan_tags(sp, ph); 1200 make_packet(sp); 1201 sp->state = PPPOE_NEWCONNECTED; 1202 sendpacket(sp); 1203 /* 1204 * Having sent the last Negotiation header, 1205 * Set up the stored packet header to 1206 * be correct for the actual session. 1207 * But keep the negotialtion stuff 1208 * around in case we need to resend this last 1209 * packet. We'll discard it when we move 1210 * from NEWCONNECTED to CONNECTED 1211 */ 1212 sp->pkt_hdr = neg->pkt->pkt_header; 1213 if (pppoe_mode == PPPOE_NONSTANDARD) 1214 sp->pkt_hdr.eh.ether_type 1215 = ETHERTYPE_PPPOE_STUPID_SESS; 1216 else 1217 sp->pkt_hdr.eh.ether_type 1218 = ETHERTYPE_PPPOE_SESS; 1219 sp->pkt_hdr.ph.code = 0; 1220 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1221 break; 1222 case PADS_CODE: 1223 /* 1224 * We are a client: 1225 * Use the host_uniq tag to find the 1226 * hook this is in response to. 1227 * take the session ID and store it away. 1228 * Also make sure the pre-made header is 1229 * correct and set us into Session mode. 1230 */ 1231 utag = get_tag(ph, PTT_HOST_UNIQ); 1232 if ((utag == NULL) 1233 || (ntohs(utag->tag_len) != sizeof(sp))) { 1234 LEAVE (ENETUNREACH); 1235 break; 1236 } 1237 sendhook = pppoe_finduniq(node, utag); 1238 if (sendhook == NULL) { 1239 LEAVE(ENETUNREACH); 1240 } 1241 1242 /* 1243 * Check the session is in the right state. 1244 * It needs to be in PPPOE_SREQ. 1245 */ 1246 sp = NG_HOOK_PRIVATE(sendhook); 1247 if (sp->state != PPPOE_SREQ) { 1248 LEAVE(ENETUNREACH); 1249 } 1250 neg = sp->neg; 1251 untimeout(pppoe_ticker, sendhook, 1252 neg->timeout_handle); 1253 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1254 sp->Session_ID = ntohs(wh->ph.sid); 1255 send_sessionid(sp); 1256 neg->timeout = 0; 1257 sp->state = PPPOE_CONNECTED; 1258 /* 1259 * Now we have gone to Connected mode, 1260 * Free all resources needed for 1261 * negotiation. 1262 * Keep a copy of the header we will be using. 1263 */ 1264 sp->pkt_hdr = neg->pkt->pkt_header; 1265 if (pppoe_mode == PPPOE_NONSTANDARD) 1266 sp->pkt_hdr.eh.ether_type 1267 = ETHERTYPE_PPPOE_STUPID_SESS; 1268 else 1269 sp->pkt_hdr.eh.ether_type 1270 = ETHERTYPE_PPPOE_SESS; 1271 sp->pkt_hdr.ph.code = 0; 1272 m_freem(neg->m); 1273 FREE(sp->neg, M_NETGRAPH_PPPOE); 1274 sp->neg = NULL; 1275 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1276 break; 1277 case PADT_CODE: 1278 /* 1279 * Send a 'close' message to the controlling 1280 * process (the one that set us up); 1281 * And then tear everything down. 1282 * 1283 * Find matching peer/session combination. 1284 */ 1285 sendhook = pppoe_findsession(node, wh); 1286 if (sendhook == NULL) { 1287 LEAVE(ENETUNREACH); 1288 } 1289 /* send message to creator */ 1290 /* close hook */ 1291 if (sendhook) { 1292 ng_rmhook_self(sendhook); 1293 } 1294 break; 1295 default: 1296 LEAVE(EPFNOSUPPORT); 1297 } 1298 break; 1299 case ETHERTYPE_PPPOE_STUPID_SESS: 1300 case ETHERTYPE_PPPOE_SESS: 1301 /* 1302 * find matching peer/session combination. 1303 */ 1304 sendhook = pppoe_findsession(node, wh); 1305 if (sendhook == NULL) { 1306 LEAVE (ENETUNREACH); 1307 break; 1308 } 1309 sp = NG_HOOK_PRIVATE(sendhook); 1310 m_adj(m, sizeof(*wh)); 1311 if (m->m_pkthdr.len < length) { 1312 /* Packet too short, dump it */ 1313 LEAVE(EMSGSIZE); 1314 } 1315 1316 /* Also need to trim excess at the end */ 1317 if (m->m_pkthdr.len > length) { 1318 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1319 } 1320 if ( sp->state != PPPOE_CONNECTED) { 1321 if (sp->state == PPPOE_NEWCONNECTED) { 1322 sp->state = PPPOE_CONNECTED; 1323 /* 1324 * Now we have gone to Connected mode, 1325 * Free all resources needed for 1326 * negotiation. Be paranoid about 1327 * whether there may be a timeout. 1328 */ 1329 m_freem(sp->neg->m); 1330 untimeout(pppoe_ticker, sendhook, 1331 sp->neg->timeout_handle); 1332 FREE(sp->neg, M_NETGRAPH_PPPOE); 1333 sp->neg = NULL; 1334 } else { 1335 LEAVE (ENETUNREACH); 1336 break; 1337 } 1338 } 1339 NG_FWD_NEW_DATA( error, item, sendhook, m); 1340 break; 1341 default: 1342 LEAVE(EPFNOSUPPORT); 1343 } 1344 } else { 1345 /* 1346 * Not ethernet or debug hook.. 1347 * 1348 * The packet has come in on a normal hook. 1349 * We need to find out what kind of hook, 1350 * So we can decide how to handle it. 1351 * Check the hook's state. 1352 */ 1353 sp = NG_HOOK_PRIVATE(hook); 1354 switch (sp->state) { 1355 case PPPOE_NEWCONNECTED: 1356 case PPPOE_CONNECTED: { 1357 static const u_char addrctrl[] = { 0xff, 0x03 }; 1358 struct pppoe_full_hdr *wh; 1359 1360 /* 1361 * Remove PPP address and control fields, if any. 1362 * For example, ng_ppp(4) always sends LCP packets 1363 * with address and control fields as required by 1364 * generic PPP. PPPoE is an exception to the rule. 1365 */ 1366 if (m->m_pkthdr.len >= 2) { 1367 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1368 LEAVE(ENOBUFS); 1369 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1370 m_adj(m, 2); 1371 } 1372 /* 1373 * Bang in a pre-made header, and set the length up 1374 * to be correct. Then send it to the ethernet driver. 1375 * But first correct the length. 1376 */ 1377 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1378 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1379 if (m == NULL) { 1380 LEAVE(ENOBUFS); 1381 } 1382 wh = mtod(m, struct pppoe_full_hdr *); 1383 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1384 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1385 privp->packets_out++; 1386 break; 1387 } 1388 case PPPOE_PRIMED: 1389 /* 1390 * A PADI packet is being returned by the application 1391 * that has set up this hook. This indicates that it 1392 * wants us to offer service. 1393 */ 1394 neg = sp->neg; 1395 if (m->m_len < sizeof(*wh)) { 1396 m = m_pullup(m, sizeof(*wh)); 1397 if (m == NULL) { 1398 LEAVE(ENOBUFS); 1399 } 1400 } 1401 wh = mtod(m, struct pppoe_full_hdr *); 1402 ph = &wh->ph; 1403 session = ntohs(wh->ph.sid); 1404 length = ntohs(wh->ph.length); 1405 code = wh->ph.code; 1406 if ( code != PADI_CODE) { 1407 LEAVE(EINVAL); 1408 }; 1409 untimeout(pppoe_ticker, hook, 1410 neg->timeout_handle); 1411 1412 /* 1413 * This is the first time we hear 1414 * from the client, so note it's 1415 * unicast address, replacing the 1416 * broadcast address. 1417 */ 1418 bcopy(wh->eh.ether_shost, 1419 neg->pkt->pkt_header.eh.ether_dhost, 1420 ETHER_ADDR_LEN); 1421 sp->state = PPPOE_SOFFER; 1422 neg->timeout = 0; 1423 neg->pkt->pkt_header.ph.code = PADO_CODE; 1424 1425 /* 1426 * start working out the tags to respond with. 1427 */ 1428 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1429 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1430 uniqtag.data.pointer = sp; 1431 init_tags(sp); 1432 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1433 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1434 insert_tag(sp, tag); /* return service */ 1435 /* 1436 * If we have a NULL service request 1437 * and have an extra service defined in this hook, 1438 * then also add a tag for the extra service. 1439 * XXX this is a hack. eventually we should be able 1440 * to support advertising many services, not just one 1441 */ 1442 if (((tag == NULL) || (tag->tag_len == 0)) 1443 && (neg->service.hdr.tag_len != 0)) { 1444 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1445 } 1446 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1447 insert_tag(sp, tag); /* returned hostunique */ 1448 insert_tag(sp, &uniqtag.hdr); 1449 scan_tags(sp, ph); 1450 make_packet(sp); 1451 sendpacket(sp); 1452 break; 1453 1454 /* 1455 * Packets coming from the hook make no sense 1456 * to sessions in these states. Throw them away. 1457 */ 1458 case PPPOE_SINIT: 1459 case PPPOE_SREQ: 1460 case PPPOE_SOFFER: 1461 case PPPOE_SNONE: 1462 case PPPOE_LISTENING: 1463 case PPPOE_DEAD: 1464 default: 1465 LEAVE(ENETUNREACH); 1466 } 1467 } 1468 quit: 1469 if (item) 1470 NG_FREE_ITEM(item); 1471 NG_FREE_M(m); 1472 return error; 1473 } 1474 1475 /* 1476 * Do local shutdown processing.. 1477 * If we are a persistant device, we might refuse to go away, and 1478 * we'd only remove our links and reset ourself. 1479 */ 1480 static int 1481 ng_pppoe_shutdown(node_p node) 1482 { 1483 const priv_p privdata = NG_NODE_PRIVATE(node); 1484 1485 AAA 1486 NG_NODE_SET_PRIVATE(node, NULL); 1487 NG_NODE_UNREF(privdata->node); 1488 FREE(privdata, M_NETGRAPH_PPPOE); 1489 return (0); 1490 } 1491 1492 /* 1493 * This is called once we've already connected a new hook to the other node. 1494 * It gives us a chance to balk at the last minute. 1495 */ 1496 static int 1497 ng_pppoe_connect(hook_p hook) 1498 { 1499 /* be really amiable and just say "YUP that's OK by me! " */ 1500 return (0); 1501 } 1502 1503 /* 1504 * Hook disconnection 1505 * 1506 * Clean up all dangling links and information about the session/hook. 1507 * For this type, removal of the last link destroys the node 1508 */ 1509 static int 1510 ng_pppoe_disconnect(hook_p hook) 1511 { 1512 node_p node = NG_HOOK_NODE(hook); 1513 priv_p privp = NG_NODE_PRIVATE(node); 1514 sessp sp; 1515 int hooks; 1516 1517 AAA 1518 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1519 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1520 privp->debug_hook = NULL; 1521 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1522 privp->ethernet_hook = NULL; 1523 if (NG_NODE_IS_VALID(node)) 1524 ng_rmnode_self(node); 1525 } else { 1526 sp = NG_HOOK_PRIVATE(hook); 1527 if (sp->state != PPPOE_SNONE ) { 1528 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1529 } 1530 /* 1531 * According to the spec, if we are connected, 1532 * we should send a DISC packet if we are shutting down 1533 * a session. 1534 */ 1535 if ((privp->ethernet_hook) 1536 && ((sp->state == PPPOE_CONNECTED) 1537 || (sp->state == PPPOE_NEWCONNECTED))) { 1538 struct mbuf *m; 1539 struct pppoe_full_hdr *wh; 1540 struct pppoe_tag *tag; 1541 int msglen = strlen(SIGNOFF); 1542 int error = 0; 1543 1544 /* revert the stored header to DISC/PADT mode */ 1545 wh = &sp->pkt_hdr; 1546 wh->ph.code = PADT_CODE; 1547 if (pppoe_mode == PPPOE_NONSTANDARD) 1548 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1549 else 1550 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1551 1552 /* generate a packet of that type */ 1553 MGETHDR(m, M_DONTWAIT, MT_DATA); 1554 if(m == NULL) 1555 printf("pppoe: Session out of mbufs\n"); 1556 else { 1557 m->m_pkthdr.rcvif = NULL; 1558 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1559 bcopy((caddr_t)wh, mtod(m, caddr_t), 1560 sizeof(*wh)); 1561 /* 1562 * Add a General error message and adjust 1563 * sizes 1564 */ 1565 wh = mtod(m, struct pppoe_full_hdr *); 1566 tag = wh->ph.tag; 1567 tag->tag_type = PTT_GEN_ERR; 1568 tag->tag_len = htons((u_int16_t)msglen); 1569 strncpy(tag->tag_data, SIGNOFF, msglen); 1570 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1571 msglen); 1572 wh->ph.length = htons(sizeof(*tag) + msglen); 1573 NG_SEND_DATA_ONLY(error, 1574 privp->ethernet_hook, m); 1575 } 1576 } 1577 /* 1578 * As long as we have somewhere to store the timeout handle, 1579 * we may have a timeout pending.. get rid of it. 1580 */ 1581 if (sp->neg) { 1582 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1583 if (sp->neg->m) 1584 m_freem(sp->neg->m); 1585 FREE(sp->neg, M_NETGRAPH_PPPOE); 1586 } 1587 FREE(sp, M_NETGRAPH_PPPOE); 1588 NG_HOOK_SET_PRIVATE(hook, NULL); 1589 /* work out how many session hooks there are */ 1590 /* Node goes away on last session hook removal */ 1591 if (privp->ethernet_hook) hooks -= 1; 1592 if (privp->debug_hook) hooks -= 1; 1593 } 1594 if ((NG_NODE_NUMHOOKS(node) == 0) 1595 && (NG_NODE_IS_VALID(node))) 1596 ng_rmnode_self(node); 1597 return (0); 1598 } 1599 1600 /* 1601 * timeouts come here. 1602 */ 1603 static void 1604 pppoe_ticker(void *arg) 1605 { 1606 int s = splnet(); 1607 hook_p hook = arg; 1608 sessp sp = NG_HOOK_PRIVATE(hook); 1609 negp neg = sp->neg; 1610 int error = 0; 1611 struct mbuf *m0 = NULL; 1612 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1613 1614 AAA 1615 switch(sp->state) { 1616 /* 1617 * resend the last packet, using an exponential backoff. 1618 * After a period of time, stop growing the backoff, 1619 * and either leave it, or revert to the start. 1620 */ 1621 case PPPOE_SINIT: 1622 case PPPOE_SREQ: 1623 /* timeouts on these produce resends */ 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, 1627 hook, neg->timeout * hz); 1628 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1629 if (sp->state == PPPOE_SREQ) { 1630 /* revert to SINIT mode */ 1631 pppoe_start(sp); 1632 } else { 1633 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1634 } 1635 } 1636 break; 1637 case PPPOE_PRIMED: 1638 case PPPOE_SOFFER: 1639 /* a timeout on these says "give up" */ 1640 ng_rmhook_self(hook); 1641 break; 1642 default: 1643 /* timeouts have no meaning in other states */ 1644 printf("pppoe: unexpected timeout\n"); 1645 } 1646 splx(s); 1647 } 1648 1649 1650 static void 1651 sendpacket(sessp sp) 1652 { 1653 int error = 0; 1654 struct mbuf *m0 = NULL; 1655 hook_p hook = sp->hook; 1656 negp neg = sp->neg; 1657 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1658 1659 AAA 1660 switch(sp->state) { 1661 case PPPOE_LISTENING: 1662 case PPPOE_DEAD: 1663 case PPPOE_SNONE: 1664 case PPPOE_CONNECTED: 1665 printf("pppoe: sendpacket: unexpected state\n"); 1666 break; 1667 1668 case PPPOE_NEWCONNECTED: 1669 /* send the PADS without a timeout - we're now connected */ 1670 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1671 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1672 break; 1673 1674 case PPPOE_PRIMED: 1675 /* No packet to send, but set up the timeout */ 1676 neg->timeout_handle = timeout(pppoe_ticker, 1677 hook, PPPOE_OFFER_TIMEOUT * hz); 1678 break; 1679 1680 case PPPOE_SOFFER: 1681 /* 1682 * send the offer but if they don't respond 1683 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1684 */ 1685 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1686 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1687 neg->timeout_handle = timeout(pppoe_ticker, 1688 hook, PPPOE_OFFER_TIMEOUT * hz); 1689 break; 1690 1691 case PPPOE_SINIT: 1692 case PPPOE_SREQ: 1693 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1694 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1695 neg->timeout_handle = timeout(pppoe_ticker, hook, 1696 (hz * PPPOE_INITIAL_TIMEOUT)); 1697 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1698 break; 1699 1700 default: 1701 error = EINVAL; 1702 printf("pppoe: timeout: bad state\n"); 1703 } 1704 /* return (error); */ 1705 } 1706 1707 /* 1708 * Parse an incoming packet to see if any tags should be copied to the 1709 * output packet. Don't do any tags that have been handled in the main 1710 * state machine. 1711 */ 1712 static const struct pppoe_tag* 1713 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1714 { 1715 const char *const end = (const char *)next_tag(ph); 1716 const char *ptn; 1717 const struct pppoe_tag *pt = &ph->tag[0]; 1718 /* 1719 * Keep processing tags while a tag header will still fit. 1720 */ 1721 AAA 1722 while((const char*)(pt + 1) <= end) { 1723 /* 1724 * If the tag data would go past the end of the packet, abort. 1725 */ 1726 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1727 if(ptn > end) 1728 return NULL; 1729 1730 switch (pt->tag_type) { 1731 case PTT_RELAY_SID: 1732 insert_tag(sp, pt); 1733 break; 1734 case PTT_EOL: 1735 return NULL; 1736 case PTT_SRV_NAME: 1737 case PTT_AC_NAME: 1738 case PTT_HOST_UNIQ: 1739 case PTT_AC_COOKIE: 1740 case PTT_VENDOR: 1741 case PTT_SRV_ERR: 1742 case PTT_SYS_ERR: 1743 case PTT_GEN_ERR: 1744 break; 1745 } 1746 pt = (const struct pppoe_tag*)ptn; 1747 } 1748 return NULL; 1749 } 1750 1751 static int 1752 pppoe_send_event(sessp sp, enum cmd cmdid) 1753 { 1754 int error; 1755 struct ng_mesg *msg; 1756 struct ngpppoe_sts *sts; 1757 1758 AAA 1759 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1760 sizeof(struct ngpppoe_sts), M_NOWAIT); 1761 if (msg == NULL) 1762 return (ENOMEM); 1763 sts = (struct ngpppoe_sts *)msg->data; 1764 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1765 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1766 return (error); 1767 } 1768