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sys/netgraph/ng_pppoe.c
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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: releng/5.2/sys/netgraph/ng_pppoe.c 111119 2003-02-19 05:47:46Z imp $ 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_field ngpppoe_init_data_type_fields[] 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_fields 92 }; 93 94 /* Parse type for struct ngpppoe_sts */ 95 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 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_fields 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 const 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 const struct pppoe_tag *scan_tags(sessp sp, 281 const struct pppoe_hdr* ph); 282 static int pppoe_send_event(sessp sp, enum cmd cmdid); 283 284 /************************************************************************* 285 * Some basic utilities from the Linux version with author's permission.* 286 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 287 ************************************************************************/ 288 289 /* 290 * Generate a new session id 291 * XXX find out the FreeBSD locking scheme. 292 */ 293 static u_int16_t 294 get_new_sid(node_p node) 295 { 296 static int pppoe_sid = 10; 297 sessp sp; 298 hook_p hook; 299 u_int16_t val; 300 priv_p privp = NG_NODE_PRIVATE(node); 301 302 AAA 303 restart: 304 val = pppoe_sid++; 305 /* 306 * Spec says 0xFFFF is reserved. 307 * Also don't use 0x0000 308 */ 309 if (val == 0xffff) { 310 pppoe_sid = 20; 311 goto restart; 312 } 313 314 /* Check it isn't already in use */ 315 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 316 /* don't check special hooks */ 317 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 318 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 319 continue; 320 sp = NG_HOOK_PRIVATE(hook); 321 if (sp->Session_ID == val) 322 goto restart; 323 } 324 325 return val; 326 } 327 328 329 /* 330 * Return the location where the next tag can be put 331 */ 332 static __inline const struct pppoe_tag* 333 next_tag(const struct pppoe_hdr* ph) 334 { 335 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 336 + ntohs(ph->length)); 337 } 338 339 /* 340 * Look for a tag of a specific type 341 * Don't trust any length the other end says. 342 * but assume we already sanity checked ph->length. 343 */ 344 static const struct pppoe_tag* 345 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 346 { 347 const char *const end = (const char *)next_tag(ph); 348 const char *ptn; 349 const struct pppoe_tag *pt = &ph->tag[0]; 350 /* 351 * Keep processing tags while a tag header will still fit. 352 */ 353 AAA 354 while((const char*)(pt + 1) <= end) { 355 /* 356 * If the tag data would go past the end of the packet, abort. 357 */ 358 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 359 if(ptn > end) 360 return NULL; 361 362 if(pt->tag_type == idx) 363 return pt; 364 365 pt = (const struct pppoe_tag*)ptn; 366 } 367 return NULL; 368 } 369 370 /************************************************************************** 371 * inlines to initialise or add tags to a session's tag list, 372 **************************************************************************/ 373 /* 374 * Initialise the session's tag list 375 */ 376 static void 377 init_tags(sessp sp) 378 { 379 AAA 380 if(sp->neg == NULL) { 381 printf("pppoe: asked to init NULL neg pointer\n"); 382 return; 383 } 384 sp->neg->numtags = 0; 385 } 386 387 static void 388 insert_tag(sessp sp, const struct pppoe_tag *tp) 389 { 390 int i; 391 negp neg; 392 393 AAA 394 if((neg = sp->neg) == NULL) { 395 printf("pppoe: asked to use NULL neg pointer\n"); 396 return; 397 } 398 if ((i = neg->numtags++) < NUMTAGS) { 399 neg->tags[i] = tp; 400 } else { 401 printf("pppoe: asked to add too many tags to packet\n"); 402 neg->numtags--; 403 } 404 } 405 406 /* 407 * Make up a packet, using the tags filled out for the session. 408 * 409 * Assume that the actual pppoe header and ethernet header 410 * are filled out externally to this routine. 411 * Also assume that neg->wh points to the correct 412 * location at the front of the buffer space. 413 */ 414 static void 415 make_packet(sessp sp) { 416 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 417 const struct pppoe_tag **tag; 418 char *dp; 419 int count; 420 int tlen; 421 u_int16_t length = 0; 422 423 AAA 424 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 425 printf("pppoe: make_packet called from wrong state\n"); 426 } 427 dp = (char *)wh->ph.tag; 428 for (count = 0, tag = sp->neg->tags; 429 ((count < sp->neg->numtags) && (count < NUMTAGS)); 430 tag++, count++) { 431 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 432 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 433 printf("pppoe: tags too long\n"); 434 sp->neg->numtags = count; 435 break; /* XXX chop off what's too long */ 436 } 437 bcopy(*tag, (char *)dp, tlen); 438 length += tlen; 439 dp += tlen; 440 } 441 wh->ph.length = htons(length); 442 sp->neg->m->m_len = length + sizeof(*wh); 443 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 444 } 445 446 /************************************************************************** 447 * Routine to match a service offered * 448 **************************************************************************/ 449 /* 450 * Find a hook that has a service string that matches that 451 * we are seeking. for now use a simple string. 452 * In the future we may need something like regexp(). 453 * for testing allow a null string to match 1st found and a null service 454 * to match all requests. Also make '*' do the same. 455 */ 456 457 #define NG_MATCH_EXACT 1 458 #define NG_MATCH_ANY 2 459 460 static hook_p 461 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 462 { 463 sessp sp = NULL; 464 negp neg = NULL; 465 priv_p privp = NG_NODE_PRIVATE(node); 466 hook_p allhook = NULL; 467 hook_p hook; 468 469 AAA 470 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 471 472 /* skip any hook that is debug or ethernet */ 473 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 474 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 475 continue; 476 sp = NG_HOOK_PRIVATE(hook); 477 478 /* Skip any sessions which are not in LISTEN mode. */ 479 if ( sp->state != PPPOE_LISTENING) 480 continue; 481 482 neg = sp->neg; 483 484 /* Special case for a blank or "*" service name (wildcard) */ 485 if (match == NG_MATCH_ANY && neg->service_len == 1 && 486 neg->service.data[0] == '*') { 487 allhook = hook; 488 continue; 489 } 490 491 /* If the lengths don't match, that aint it. */ 492 if (neg->service_len != svc_len) 493 continue; 494 495 /* An exact match? */ 496 if (svc_len == 0) 497 break; 498 499 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 500 break; 501 } 502 return (hook ? hook : allhook); 503 } 504 /************************************************************************** 505 * Routine to find a particular session that matches an incoming packet * 506 **************************************************************************/ 507 static hook_p 508 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 509 { 510 sessp sp = NULL; 511 hook_p hook = NULL; 512 priv_p privp = NG_NODE_PRIVATE(node); 513 u_int16_t session = ntohs(wh->ph.sid); 514 515 /* 516 * find matching peer/session combination. 517 */ 518 AAA 519 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 520 /* don't check special hooks */ 521 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 522 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 523 continue; 524 } 525 sp = NG_HOOK_PRIVATE(hook); 526 if ( ( (sp->state == PPPOE_CONNECTED) 527 || (sp->state == PPPOE_NEWCONNECTED) ) 528 && (sp->Session_ID == session) 529 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 530 wh->eh.ether_shost, 531 ETHER_ADDR_LEN)) == 0) { 532 break; 533 } 534 } 535 return (hook); 536 } 537 538 static hook_p 539 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 540 { 541 hook_p hook = NULL; 542 priv_p privp = NG_NODE_PRIVATE(node); 543 union uniq uniq; 544 545 AAA 546 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 547 /* cycle through all known hooks */ 548 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 549 /* don't check special hooks */ 550 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 551 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 552 continue; 553 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 554 break; 555 } 556 return (hook); 557 } 558 559 /************************************************************************** 560 * start of Netgraph entrypoints * 561 **************************************************************************/ 562 563 /* 564 * Allocate the private data structure and the generic node 565 * and link them together. 566 * 567 * ng_make_node_common() returns with a generic node struct 568 * with a single reference for us.. we transfer it to the 569 * private structure.. when we free the private struct we must 570 * unref the node so it gets freed too. 571 */ 572 static int 573 ng_pppoe_constructor(node_p node) 574 { 575 priv_p privdata; 576 577 AAA 578 /* Initialize private descriptor */ 579 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 580 M_NOWAIT | M_ZERO); 581 if (privdata == NULL) 582 return (ENOMEM); 583 584 /* Link structs together; this counts as our one reference to *nodep */ 585 NG_NODE_SET_PRIVATE(node, privdata); 586 privdata->node = node; 587 return (0); 588 } 589 590 /* 591 * Give our ok for a hook to be added... 592 * point the hook's private info to the hook structure. 593 * 594 * The following hook names are special: 595 * Ethernet: the hook that should be connected to a NIC. 596 * debug: copies of data sent out here (when I write the code). 597 * All other hook names need only be unique. (the framework checks this). 598 */ 599 static int 600 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 601 { 602 const priv_p privp = NG_NODE_PRIVATE(node); 603 sessp sp; 604 605 AAA 606 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 607 privp->ethernet_hook = hook; 608 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 609 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 610 privp->debug_hook = hook; 611 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 612 } else { 613 /* 614 * Any other unique name is OK. 615 * The infrastructure has already checked that it's unique, 616 * so just allocate it and hook it in. 617 */ 618 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 619 if (sp == NULL) { 620 return (ENOMEM); 621 } 622 623 NG_HOOK_SET_PRIVATE(hook, sp); 624 sp->hook = hook; 625 } 626 return(0); 627 } 628 629 /* 630 * Get a netgraph control message. 631 * Check it is one we understand. If needed, send a response. 632 * We sometimes save the address for an async action later. 633 * Always free the message. 634 */ 635 static int 636 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 637 { 638 priv_p privp = NG_NODE_PRIVATE(node); 639 struct ngpppoe_init_data *ourmsg = NULL; 640 struct ng_mesg *resp = NULL; 641 int error = 0; 642 hook_p hook = NULL; 643 sessp sp = NULL; 644 negp neg = NULL; 645 struct ng_mesg *msg; 646 647 AAA 648 NGI_GET_MSG(item, msg); 649 /* Deal with message according to cookie and command */ 650 switch (msg->header.typecookie) { 651 case NGM_PPPOE_COOKIE: 652 switch (msg->header.cmd) { 653 case NGM_PPPOE_CONNECT: 654 case NGM_PPPOE_LISTEN: 655 case NGM_PPPOE_OFFER: 656 case NGM_PPPOE_SERVICE: 657 ourmsg = (struct ngpppoe_init_data *)msg->data; 658 if (msg->header.arglen < sizeof(*ourmsg)) { 659 printf("pppoe: init data too small\n"); 660 LEAVE(EMSGSIZE); 661 } 662 if (msg->header.arglen - sizeof(*ourmsg) > 663 PPPOE_SERVICE_NAME_SIZE) { 664 printf("pppoe_rcvmsg: service name too big"); 665 LEAVE(EMSGSIZE); 666 } 667 if (msg->header.arglen - sizeof(*ourmsg) < 668 ourmsg->data_len) { 669 printf("pppoe: init data has bad length," 670 " %d should be %zd\n", ourmsg->data_len, 671 msg->header.arglen - sizeof (*ourmsg)); 672 LEAVE(EMSGSIZE); 673 } 674 675 /* make sure strcmp will terminate safely */ 676 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 677 678 /* cycle through all known hooks */ 679 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 680 if (NG_HOOK_NAME(hook) 681 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 682 break; 683 } 684 if (hook == NULL) { 685 LEAVE(ENOENT); 686 } 687 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 688 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 689 LEAVE(EINVAL); 690 } 691 sp = NG_HOOK_PRIVATE(hook); 692 693 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 694 /* 695 * Ensure we aren't already listening for this 696 * service. 697 */ 698 if (pppoe_match_svc(node, ourmsg->data, 699 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 700 LEAVE(EEXIST); 701 } 702 } 703 704 /* 705 * PPPOE_SERVICE advertisments are set up 706 * on sessions that are in PRIMED state. 707 */ 708 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 709 break; 710 } 711 if (sp->state |= PPPOE_SNONE) { 712 printf("pppoe: Session already active\n"); 713 LEAVE(EISCONN); 714 } 715 716 /* 717 * set up prototype header 718 */ 719 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 720 M_NOWAIT | M_ZERO); 721 722 if (neg == NULL) { 723 printf("pppoe: Session out of memory\n"); 724 LEAVE(ENOMEM); 725 } 726 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 727 if(neg->m == NULL) { 728 printf("pppoe: Session out of mbufs\n"); 729 FREE(neg, M_NETGRAPH_PPPOE); 730 LEAVE(ENOBUFS); 731 } 732 neg->m->m_pkthdr.rcvif = NULL; 733 MCLGET(neg->m, M_DONTWAIT); 734 if ((neg->m->m_flags & M_EXT) == 0) { 735 printf("pppoe: Session out of mcls\n"); 736 m_freem(neg->m); 737 FREE(neg, M_NETGRAPH_PPPOE); 738 LEAVE(ENOBUFS); 739 } 740 sp->neg = neg; 741 callout_handle_init( &neg->timeout_handle); 742 neg->m->m_len = sizeof(struct pppoe_full_hdr); 743 neg->pkt = mtod(neg->m, union packet*); 744 neg->pkt->pkt_header.eh = eh_prototype; 745 neg->pkt->pkt_header.ph.ver = 0x1; 746 neg->pkt->pkt_header.ph.type = 0x1; 747 neg->pkt->pkt_header.ph.sid = 0x0000; 748 neg->timeout = 0; 749 750 sp->creator = NGI_RETADDR(item); 751 } 752 switch (msg->header.cmd) { 753 case NGM_PPPOE_GET_STATUS: 754 { 755 struct ngpppoestat *stats; 756 757 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 758 if (!resp) { 759 LEAVE(ENOMEM); 760 } 761 stats = (struct ngpppoestat *) resp->data; 762 stats->packets_in = privp->packets_in; 763 stats->packets_out = privp->packets_out; 764 break; 765 } 766 case NGM_PPPOE_CONNECT: 767 /* 768 * Check the hook exists and is Uninitialised. 769 * Send a PADI request, and start the timeout logic. 770 * Store the originator of this message so we can send 771 * a success of fail message to them later. 772 * Move the session to SINIT 773 * Set up the session to the correct state and 774 * start it. 775 */ 776 neg->service.hdr.tag_type = PTT_SRV_NAME; 777 neg->service.hdr.tag_len = 778 htons((u_int16_t)ourmsg->data_len); 779 if (ourmsg->data_len) 780 bcopy(ourmsg->data, neg->service.data, 781 ourmsg->data_len); 782 neg->service_len = ourmsg->data_len; 783 pppoe_start(sp); 784 break; 785 case NGM_PPPOE_LISTEN: 786 /* 787 * Check the hook exists and is Uninitialised. 788 * Install the service matching string. 789 * Store the originator of this message so we can send 790 * a success of fail message to them later. 791 * Move the hook to 'LISTENING' 792 */ 793 neg->service.hdr.tag_type = PTT_SRV_NAME; 794 neg->service.hdr.tag_len = 795 htons((u_int16_t)ourmsg->data_len); 796 797 if (ourmsg->data_len) 798 bcopy(ourmsg->data, neg->service.data, 799 ourmsg->data_len); 800 neg->service_len = ourmsg->data_len; 801 neg->pkt->pkt_header.ph.code = PADT_CODE; 802 /* 803 * wait for PADI packet coming from ethernet 804 */ 805 sp->state = PPPOE_LISTENING; 806 break; 807 case NGM_PPPOE_OFFER: 808 /* 809 * Check the hook exists and is Uninitialised. 810 * Store the originator of this message so we can send 811 * a success of fail message to them later. 812 * Store the AC-Name given and go to PRIMED. 813 */ 814 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 815 neg->ac_name.hdr.tag_len = 816 htons((u_int16_t)ourmsg->data_len); 817 if (ourmsg->data_len) 818 bcopy(ourmsg->data, neg->ac_name.data, 819 ourmsg->data_len); 820 neg->ac_name_len = ourmsg->data_len; 821 neg->pkt->pkt_header.ph.code = PADO_CODE; 822 /* 823 * Wait for PADI packet coming from hook 824 */ 825 sp->state = PPPOE_PRIMED; 826 break; 827 case NGM_PPPOE_SERVICE: 828 /* 829 * Check the session is primed. 830 * for now just allow ONE service to be advertised. 831 * If you do it twice you just overwrite. 832 */ 833 if (sp->state != PPPOE_PRIMED) { 834 printf("pppoe: Session not primed\n"); 835 LEAVE(EISCONN); 836 } 837 neg = sp->neg; 838 neg->service.hdr.tag_type = PTT_SRV_NAME; 839 neg->service.hdr.tag_len = 840 htons((u_int16_t)ourmsg->data_len); 841 842 if (ourmsg->data_len) 843 bcopy(ourmsg->data, neg->service.data, 844 ourmsg->data_len); 845 neg->service_len = ourmsg->data_len; 846 break; 847 default: 848 LEAVE(EINVAL); 849 } 850 break; 851 default: 852 LEAVE(EINVAL); 853 } 854 855 /* Take care of synchronous response, if any */ 856 quit: 857 NG_RESPOND_MSG(error, node, item, resp); 858 /* Free the message and return */ 859 NG_FREE_MSG(msg); 860 return(error); 861 } 862 863 /* 864 * Start a client into the first state. A separate function because 865 * it can be needed if the negotiation times out. 866 */ 867 static void 868 pppoe_start(sessp sp) 869 { 870 struct { 871 struct pppoe_tag hdr; 872 union uniq data; 873 } __packed uniqtag; 874 875 /* 876 * kick the state machine into starting up 877 */ 878 AAA 879 sp->state = PPPOE_SINIT; 880 /* reset the packet header to broadcast */ 881 sp->neg->pkt->pkt_header.eh = eh_prototype; 882 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 883 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 884 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 885 uniqtag.data.pointer = sp; 886 init_tags(sp); 887 insert_tag(sp, &uniqtag.hdr); 888 insert_tag(sp, &sp->neg->service.hdr); 889 make_packet(sp); 890 sendpacket(sp); 891 } 892 893 static int 894 send_acname(sessp sp, const struct pppoe_tag *tag) 895 { 896 int error, tlen; 897 struct ng_mesg *msg; 898 struct ngpppoe_sts *sts; 899 900 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 901 sizeof(struct ngpppoe_sts), M_NOWAIT); 902 if (msg == NULL) 903 return (ENOMEM); 904 905 sts = (struct ngpppoe_sts *)msg->data; 906 tlen = min(NG_HOOKLEN, ntohs(tag->tag_len)); 907 strncpy(sts->hook, tag->tag_data, tlen); 908 sts->hook[tlen] = '\0'; 909 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 910 911 return (error); 912 } 913 914 static int 915 send_sessionid(sessp sp) 916 { 917 int error; 918 struct ng_mesg *msg; 919 920 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 921 sizeof(u_int16_t), M_NOWAIT); 922 if (msg == NULL) 923 return (ENOMEM); 924 925 *(u_int16_t *)msg->data = sp->Session_ID; 926 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 927 928 return (error); 929 } 930 931 /* 932 * Receive data, and do something with it. 933 * The caller will never free m or meta, so 934 * if we use up this data or abort we must free BOTH of these. 935 */ 936 static int 937 ng_pppoe_rcvdata(hook_p hook, item_p item) 938 { 939 node_p node = NG_HOOK_NODE(hook); 940 const priv_p privp = NG_NODE_PRIVATE(node); 941 sessp sp = NG_HOOK_PRIVATE(hook); 942 const struct pppoe_full_hdr *wh; 943 const struct pppoe_hdr *ph; 944 int error = 0; 945 u_int16_t session; 946 u_int16_t length; 947 u_int8_t code; 948 const struct pppoe_tag *utag = NULL, *tag = NULL; 949 hook_p sendhook; 950 struct { 951 struct pppoe_tag hdr; 952 union uniq data; 953 } __packed uniqtag; 954 negp neg = NULL; 955 struct mbuf *m; 956 957 AAA 958 NGI_GET_M(item, m); 959 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 960 /* 961 * Data from the debug hook gets sent without modification 962 * straight to the ethernet. 963 */ 964 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 965 privp->packets_out++; 966 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 967 /* 968 * Incoming data. 969 * Dig out various fields from the packet. 970 * use them to decide where to send it. 971 */ 972 973 privp->packets_in++; 974 if( m->m_len < sizeof(*wh)) { 975 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 976 if (m == NULL) { 977 printf("couldn't m_pullup\n"); 978 LEAVE(ENOBUFS); 979 } 980 } 981 wh = mtod(m, struct pppoe_full_hdr *); 982 length = ntohs(wh->ph.length); 983 switch(wh->eh.ether_type) { 984 case ETHERTYPE_PPPOE_STUPID_DISC: 985 nonstandard = 1; 986 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 987 /* fall through */ 988 case ETHERTYPE_PPPOE_DISC: 989 /* 990 * We need to try to make sure that the tag area 991 * is contiguous, or we could wander off the end 992 * of a buffer and make a mess. 993 * (Linux wouldn't have this problem). 994 */ 995 if (m->m_pkthdr.len <= MHLEN) { 996 if( m->m_len < m->m_pkthdr.len) { 997 m = m_pullup(m, m->m_pkthdr.len); 998 if (m == NULL) { 999 printf("couldn't m_pullup\n"); 1000 LEAVE(ENOBUFS); 1001 } 1002 } 1003 } 1004 if (m->m_len != m->m_pkthdr.len) { 1005 /* 1006 * It's not all in one piece. 1007 * We need to do extra work. 1008 * Put it into a cluster. 1009 */ 1010 struct mbuf *n; 1011 n = m_dup(m, M_DONTWAIT); 1012 m_freem(m); 1013 m = n; 1014 if (m) { 1015 /* just check we got a cluster */ 1016 if (m->m_len != m->m_pkthdr.len) { 1017 m_freem(m); 1018 m = NULL; 1019 } 1020 } 1021 if (m == NULL) { 1022 printf("packet fragmented\n"); 1023 LEAVE(EMSGSIZE); 1024 } 1025 } 1026 wh = mtod(m, struct pppoe_full_hdr *); 1027 length = ntohs(wh->ph.length); 1028 ph = &wh->ph; 1029 session = ntohs(wh->ph.sid); 1030 code = wh->ph.code; 1031 1032 switch(code) { 1033 case PADI_CODE: 1034 /* 1035 * We are a server: 1036 * Look for a hook with the required service 1037 * and send the ENTIRE packet up there. 1038 * It should come back to a new hook in 1039 * PRIMED state. Look there for further 1040 * processing. 1041 */ 1042 tag = get_tag(ph, PTT_SRV_NAME); 1043 if (tag == NULL) { 1044 printf("no service tag\n"); 1045 LEAVE(ENETUNREACH); 1046 } 1047 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1048 tag->tag_data, ntohs(tag->tag_len), 1049 NG_MATCH_ANY); 1050 if (sendhook) { 1051 NG_FWD_NEW_DATA(error, item, 1052 sendhook, m); 1053 } else { 1054 LEAVE(ENETUNREACH); 1055 } 1056 break; 1057 case PADO_CODE: 1058 /* 1059 * We are a client: 1060 * Use the host_uniq tag to find the 1061 * hook this is in response to. 1062 * Received #2, now send #3 1063 * For now simply accept the first we receive. 1064 */ 1065 utag = get_tag(ph, PTT_HOST_UNIQ); 1066 if ((utag == NULL) 1067 || (ntohs(utag->tag_len) != sizeof(sp))) { 1068 printf("no host unique field\n"); 1069 LEAVE(ENETUNREACH); 1070 } 1071 1072 sendhook = pppoe_finduniq(node, utag); 1073 if (sendhook == NULL) { 1074 printf("no matching session\n"); 1075 LEAVE(ENETUNREACH); 1076 } 1077 1078 /* 1079 * Check the session is in the right state. 1080 * It needs to be in PPPOE_SINIT. 1081 */ 1082 sp = NG_HOOK_PRIVATE(sendhook); 1083 if (sp->state != PPPOE_SINIT) { 1084 printf("session in wrong state\n"); 1085 LEAVE(ENETUNREACH); 1086 } 1087 neg = sp->neg; 1088 untimeout(pppoe_ticker, sendhook, 1089 neg->timeout_handle); 1090 1091 /* 1092 * This is the first time we hear 1093 * from the server, so note it's 1094 * unicast address, replacing the 1095 * broadcast address . 1096 */ 1097 bcopy(wh->eh.ether_shost, 1098 neg->pkt->pkt_header.eh.ether_dhost, 1099 ETHER_ADDR_LEN); 1100 neg->timeout = 0; 1101 neg->pkt->pkt_header.ph.code = PADR_CODE; 1102 init_tags(sp); 1103 insert_tag(sp, utag); /* Host Unique */ 1104 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1105 insert_tag(sp, tag); /* return cookie */ 1106 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1107 insert_tag(sp, tag); /* return it */ 1108 send_acname(sp, tag); 1109 } 1110 insert_tag(sp, &neg->service.hdr); /* Service */ 1111 scan_tags(sp, ph); 1112 make_packet(sp); 1113 sp->state = PPPOE_SREQ; 1114 sendpacket(sp); 1115 break; 1116 case PADR_CODE: 1117 1118 /* 1119 * We are a server: 1120 * Use the ac_cookie tag to find the 1121 * hook this is in response to. 1122 */ 1123 utag = get_tag(ph, PTT_AC_COOKIE); 1124 if ((utag == NULL) 1125 || (ntohs(utag->tag_len) != sizeof(sp))) { 1126 LEAVE(ENETUNREACH); 1127 } 1128 1129 sendhook = pppoe_finduniq(node, utag); 1130 if (sendhook == NULL) { 1131 LEAVE(ENETUNREACH); 1132 } 1133 1134 /* 1135 * Check the session is in the right state. 1136 * It needs to be in PPPOE_SOFFER 1137 * or PPPOE_NEWCONNECTED. If the latter, 1138 * then this is a retry by the client. 1139 * so be nice, and resend. 1140 */ 1141 sp = NG_HOOK_PRIVATE(sendhook); 1142 if (sp->state == PPPOE_NEWCONNECTED) { 1143 /* 1144 * Whoa! drop back to resend that 1145 * PADS packet. 1146 * We should still have a copy of it. 1147 */ 1148 sp->state = PPPOE_SOFFER; 1149 } 1150 if (sp->state != PPPOE_SOFFER) { 1151 LEAVE (ENETUNREACH); 1152 break; 1153 } 1154 neg = sp->neg; 1155 untimeout(pppoe_ticker, sendhook, 1156 neg->timeout_handle); 1157 neg->pkt->pkt_header.ph.code = PADS_CODE; 1158 if (sp->Session_ID == 0) 1159 neg->pkt->pkt_header.ph.sid = 1160 htons(sp->Session_ID 1161 = get_new_sid(node)); 1162 send_sessionid(sp); 1163 neg->timeout = 0; 1164 /* 1165 * start working out the tags to respond with. 1166 */ 1167 init_tags(sp); 1168 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1169 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1170 insert_tag(sp, tag);/* return service */ 1171 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1172 insert_tag(sp, tag); /* return it */ 1173 insert_tag(sp, utag); /* ac_cookie */ 1174 scan_tags(sp, ph); 1175 make_packet(sp); 1176 sp->state = PPPOE_NEWCONNECTED; 1177 sendpacket(sp); 1178 /* 1179 * Having sent the last Negotiation header, 1180 * Set up the stored packet header to 1181 * be correct for the actual session. 1182 * But keep the negotialtion stuff 1183 * around in case we need to resend this last 1184 * packet. We'll discard it when we move 1185 * from NEWCONNECTED to CONNECTED 1186 */ 1187 sp->pkt_hdr = neg->pkt->pkt_header; 1188 if (nonstandard) 1189 sp->pkt_hdr.eh.ether_type 1190 = ETHERTYPE_PPPOE_STUPID_SESS; 1191 else 1192 sp->pkt_hdr.eh.ether_type 1193 = ETHERTYPE_PPPOE_SESS; 1194 sp->pkt_hdr.ph.code = 0; 1195 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1196 break; 1197 case PADS_CODE: 1198 /* 1199 * We are a client: 1200 * Use the host_uniq tag to find the 1201 * hook this is in response to. 1202 * take the session ID and store it away. 1203 * Also make sure the pre-made header is 1204 * correct and set us into Session mode. 1205 */ 1206 utag = get_tag(ph, PTT_HOST_UNIQ); 1207 if ((utag == NULL) 1208 || (ntohs(utag->tag_len) != sizeof(sp))) { 1209 LEAVE (ENETUNREACH); 1210 break; 1211 } 1212 sendhook = pppoe_finduniq(node, utag); 1213 if (sendhook == NULL) { 1214 LEAVE(ENETUNREACH); 1215 } 1216 1217 /* 1218 * Check the session is in the right state. 1219 * It needs to be in PPPOE_SREQ. 1220 */ 1221 sp = NG_HOOK_PRIVATE(sendhook); 1222 if (sp->state != PPPOE_SREQ) { 1223 LEAVE(ENETUNREACH); 1224 } 1225 neg = sp->neg; 1226 untimeout(pppoe_ticker, sendhook, 1227 neg->timeout_handle); 1228 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1229 sp->Session_ID = ntohs(wh->ph.sid); 1230 send_sessionid(sp); 1231 neg->timeout = 0; 1232 sp->state = PPPOE_CONNECTED; 1233 /* 1234 * Now we have gone to Connected mode, 1235 * Free all resources needed for 1236 * negotiation. 1237 * Keep a copy of the header we will be using. 1238 */ 1239 sp->pkt_hdr = neg->pkt->pkt_header; 1240 if (nonstandard) 1241 sp->pkt_hdr.eh.ether_type 1242 = ETHERTYPE_PPPOE_STUPID_SESS; 1243 else 1244 sp->pkt_hdr.eh.ether_type 1245 = ETHERTYPE_PPPOE_SESS; 1246 sp->pkt_hdr.ph.code = 0; 1247 m_freem(neg->m); 1248 FREE(sp->neg, M_NETGRAPH_PPPOE); 1249 sp->neg = NULL; 1250 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1251 break; 1252 case PADT_CODE: 1253 /* 1254 * Send a 'close' message to the controlling 1255 * process (the one that set us up); 1256 * And then tear everything down. 1257 * 1258 * Find matching peer/session combination. 1259 */ 1260 sendhook = pppoe_findsession(node, wh); 1261 if (sendhook == NULL) { 1262 LEAVE(ENETUNREACH); 1263 } 1264 /* send message to creator */ 1265 /* close hook */ 1266 if (sendhook) { 1267 ng_rmhook_self(sendhook); 1268 } 1269 break; 1270 default: 1271 LEAVE(EPFNOSUPPORT); 1272 } 1273 break; 1274 case ETHERTYPE_PPPOE_STUPID_SESS: 1275 case ETHERTYPE_PPPOE_SESS: 1276 /* 1277 * find matching peer/session combination. 1278 */ 1279 sendhook = pppoe_findsession(node, wh); 1280 if (sendhook == NULL) { 1281 LEAVE (ENETUNREACH); 1282 break; 1283 } 1284 sp = NG_HOOK_PRIVATE(sendhook); 1285 m_adj(m, sizeof(*wh)); 1286 if (m->m_pkthdr.len < length) { 1287 /* Packet too short, dump it */ 1288 LEAVE(EMSGSIZE); 1289 } 1290 1291 /* Also need to trim excess at the end */ 1292 if (m->m_pkthdr.len > length) { 1293 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1294 } 1295 if ( sp->state != PPPOE_CONNECTED) { 1296 if (sp->state == PPPOE_NEWCONNECTED) { 1297 sp->state = PPPOE_CONNECTED; 1298 /* 1299 * Now we have gone to Connected mode, 1300 * Free all resources needed for 1301 * negotiation. Be paranoid about 1302 * whether there may be a timeout. 1303 */ 1304 m_freem(sp->neg->m); 1305 untimeout(pppoe_ticker, sendhook, 1306 sp->neg->timeout_handle); 1307 FREE(sp->neg, M_NETGRAPH_PPPOE); 1308 sp->neg = NULL; 1309 } else { 1310 LEAVE (ENETUNREACH); 1311 break; 1312 } 1313 } 1314 NG_FWD_NEW_DATA( error, item, sendhook, m); 1315 break; 1316 default: 1317 LEAVE(EPFNOSUPPORT); 1318 } 1319 } else { 1320 /* 1321 * Not ethernet or debug hook.. 1322 * 1323 * The packet has come in on a normal hook. 1324 * We need to find out what kind of hook, 1325 * So we can decide how to handle it. 1326 * Check the hook's state. 1327 */ 1328 sp = NG_HOOK_PRIVATE(hook); 1329 switch (sp->state) { 1330 case PPPOE_NEWCONNECTED: 1331 case PPPOE_CONNECTED: { 1332 static const u_char addrctrl[] = { 0xff, 0x03 }; 1333 struct pppoe_full_hdr *wh; 1334 1335 /* 1336 * Remove PPP address and control fields, if any. 1337 * For example, ng_ppp(4) always sends LCP packets 1338 * with address and control fields as required by 1339 * generic PPP. PPPoE is an exception to the rule. 1340 */ 1341 if (m->m_pkthdr.len >= 2) { 1342 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1343 LEAVE(ENOBUFS); 1344 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1345 m_adj(m, 2); 1346 } 1347 /* 1348 * Bang in a pre-made header, and set the length up 1349 * to be correct. Then send it to the ethernet driver. 1350 * But first correct the length. 1351 */ 1352 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1353 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1354 if (m == NULL) { 1355 LEAVE(ENOBUFS); 1356 } 1357 wh = mtod(m, struct pppoe_full_hdr *); 1358 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1359 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1360 privp->packets_out++; 1361 break; 1362 } 1363 case PPPOE_PRIMED: 1364 /* 1365 * A PADI packet is being returned by the application 1366 * that has set up this hook. This indicates that it 1367 * wants us to offer service. 1368 */ 1369 neg = sp->neg; 1370 if (m->m_len < sizeof(*wh)) { 1371 m = m_pullup(m, sizeof(*wh)); 1372 if (m == NULL) { 1373 LEAVE(ENOBUFS); 1374 } 1375 } 1376 wh = mtod(m, struct pppoe_full_hdr *); 1377 ph = &wh->ph; 1378 session = ntohs(wh->ph.sid); 1379 length = ntohs(wh->ph.length); 1380 code = wh->ph.code; 1381 if ( code != PADI_CODE) { 1382 LEAVE(EINVAL); 1383 }; 1384 untimeout(pppoe_ticker, hook, 1385 neg->timeout_handle); 1386 1387 /* 1388 * This is the first time we hear 1389 * from the client, so note it's 1390 * unicast address, replacing the 1391 * broadcast address. 1392 */ 1393 bcopy(wh->eh.ether_shost, 1394 neg->pkt->pkt_header.eh.ether_dhost, 1395 ETHER_ADDR_LEN); 1396 sp->state = PPPOE_SOFFER; 1397 neg->timeout = 0; 1398 neg->pkt->pkt_header.ph.code = PADO_CODE; 1399 1400 /* 1401 * start working out the tags to respond with. 1402 */ 1403 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1404 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1405 uniqtag.data.pointer = sp; 1406 init_tags(sp); 1407 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1408 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1409 insert_tag(sp, tag); /* return service */ 1410 /* 1411 * If we have a NULL service request 1412 * and have an extra service defined in this hook, 1413 * then also add a tag for the extra service. 1414 * XXX this is a hack. eventually we should be able 1415 * to support advertising many services, not just one 1416 */ 1417 if (((tag == NULL) || (tag->tag_len == 0)) 1418 && (neg->service.hdr.tag_len != 0)) { 1419 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1420 } 1421 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1422 insert_tag(sp, tag); /* returned hostunique */ 1423 insert_tag(sp, &uniqtag.hdr); 1424 scan_tags(sp, ph); 1425 make_packet(sp); 1426 sendpacket(sp); 1427 break; 1428 1429 /* 1430 * Packets coming from the hook make no sense 1431 * to sessions in these states. Throw them away. 1432 */ 1433 case PPPOE_SINIT: 1434 case PPPOE_SREQ: 1435 case PPPOE_SOFFER: 1436 case PPPOE_SNONE: 1437 case PPPOE_LISTENING: 1438 case PPPOE_DEAD: 1439 default: 1440 LEAVE(ENETUNREACH); 1441 } 1442 } 1443 quit: 1444 if (item) 1445 NG_FREE_ITEM(item); 1446 NG_FREE_M(m); 1447 return error; 1448 } 1449 1450 /* 1451 * Do local shutdown processing.. 1452 * If we are a persistant device, we might refuse to go away, and 1453 * we'd only remove our links and reset ourself. 1454 */ 1455 static int 1456 ng_pppoe_shutdown(node_p node) 1457 { 1458 const priv_p privdata = NG_NODE_PRIVATE(node); 1459 1460 AAA 1461 NG_NODE_SET_PRIVATE(node, NULL); 1462 NG_NODE_UNREF(privdata->node); 1463 FREE(privdata, M_NETGRAPH_PPPOE); 1464 return (0); 1465 } 1466 1467 /* 1468 * This is called once we've already connected a new hook to the other node. 1469 * It gives us a chance to balk at the last minute. 1470 */ 1471 static int 1472 ng_pppoe_connect(hook_p hook) 1473 { 1474 /* be really amiable and just say "YUP that's OK by me! " */ 1475 return (0); 1476 } 1477 1478 /* 1479 * Hook disconnection 1480 * 1481 * Clean up all dangling links and information about the session/hook. 1482 * For this type, removal of the last link destroys the node 1483 */ 1484 static int 1485 ng_pppoe_disconnect(hook_p hook) 1486 { 1487 node_p node = NG_HOOK_NODE(hook); 1488 priv_p privp = NG_NODE_PRIVATE(node); 1489 sessp sp; 1490 int hooks; 1491 1492 AAA 1493 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1494 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1495 privp->debug_hook = NULL; 1496 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1497 privp->ethernet_hook = NULL; 1498 if (NG_NODE_IS_VALID(node)) 1499 ng_rmnode_self(node); 1500 } else { 1501 sp = NG_HOOK_PRIVATE(hook); 1502 if (sp->state != PPPOE_SNONE ) { 1503 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1504 } 1505 /* 1506 * According to the spec, if we are connected, 1507 * we should send a DISC packet if we are shutting down 1508 * a session. 1509 */ 1510 if ((privp->ethernet_hook) 1511 && ((sp->state == PPPOE_CONNECTED) 1512 || (sp->state == PPPOE_NEWCONNECTED))) { 1513 struct mbuf *m; 1514 struct pppoe_full_hdr *wh; 1515 struct pppoe_tag *tag; 1516 int msglen = strlen(SIGNOFF); 1517 int error = 0; 1518 1519 /* revert the stored header to DISC/PADT mode */ 1520 wh = &sp->pkt_hdr; 1521 wh->ph.code = PADT_CODE; 1522 if (nonstandard) 1523 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1524 else 1525 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1526 1527 /* generate a packet of that type */ 1528 MGETHDR(m, M_DONTWAIT, MT_DATA); 1529 if(m == NULL) 1530 printf("pppoe: Session out of mbufs\n"); 1531 else { 1532 m->m_pkthdr.rcvif = NULL; 1533 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1534 bcopy((caddr_t)wh, mtod(m, caddr_t), 1535 sizeof(*wh)); 1536 /* 1537 * Add a General error message and adjust 1538 * sizes 1539 */ 1540 wh = mtod(m, struct pppoe_full_hdr *); 1541 tag = wh->ph.tag; 1542 tag->tag_type = PTT_GEN_ERR; 1543 tag->tag_len = htons((u_int16_t)msglen); 1544 strncpy(tag->tag_data, SIGNOFF, msglen); 1545 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1546 msglen); 1547 wh->ph.length = htons(sizeof(*tag) + msglen); 1548 NG_SEND_DATA_ONLY(error, 1549 privp->ethernet_hook, m); 1550 } 1551 } 1552 /* 1553 * As long as we have somewhere to store the timeout handle, 1554 * we may have a timeout pending.. get rid of it. 1555 */ 1556 if (sp->neg) { 1557 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1558 if (sp->neg->m) 1559 m_freem(sp->neg->m); 1560 FREE(sp->neg, M_NETGRAPH_PPPOE); 1561 } 1562 FREE(sp, M_NETGRAPH_PPPOE); 1563 NG_HOOK_SET_PRIVATE(hook, NULL); 1564 /* work out how many session hooks there are */ 1565 /* Node goes away on last session hook removal */ 1566 if (privp->ethernet_hook) hooks -= 1; 1567 if (privp->debug_hook) hooks -= 1; 1568 } 1569 if ((NG_NODE_NUMHOOKS(node) == 0) 1570 && (NG_NODE_IS_VALID(node))) 1571 ng_rmnode_self(node); 1572 return (0); 1573 } 1574 1575 /* 1576 * timeouts come here. 1577 */ 1578 static void 1579 pppoe_ticker(void *arg) 1580 { 1581 int s = splnet(); 1582 hook_p hook = arg; 1583 sessp sp = NG_HOOK_PRIVATE(hook); 1584 negp neg = sp->neg; 1585 int error = 0; 1586 struct mbuf *m0 = NULL; 1587 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1588 1589 AAA 1590 switch(sp->state) { 1591 /* 1592 * resend the last packet, using an exponential backoff. 1593 * After a period of time, stop growing the backoff, 1594 * and either leave it, or revert to the start. 1595 */ 1596 case PPPOE_SINIT: 1597 case PPPOE_SREQ: 1598 /* timeouts on these produce resends */ 1599 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1600 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1601 neg->timeout_handle = timeout(pppoe_ticker, 1602 hook, neg->timeout * hz); 1603 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1604 if (sp->state == PPPOE_SREQ) { 1605 /* revert to SINIT mode */ 1606 pppoe_start(sp); 1607 } else { 1608 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1609 } 1610 } 1611 break; 1612 case PPPOE_PRIMED: 1613 case PPPOE_SOFFER: 1614 /* a timeout on these says "give up" */ 1615 ng_rmhook_self(hook); 1616 break; 1617 default: 1618 /* timeouts have no meaning in other states */ 1619 printf("pppoe: unexpected timeout\n"); 1620 } 1621 splx(s); 1622 } 1623 1624 1625 static void 1626 sendpacket(sessp sp) 1627 { 1628 int error = 0; 1629 struct mbuf *m0 = NULL; 1630 hook_p hook = sp->hook; 1631 negp neg = sp->neg; 1632 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1633 1634 AAA 1635 switch(sp->state) { 1636 case PPPOE_LISTENING: 1637 case PPPOE_DEAD: 1638 case PPPOE_SNONE: 1639 case PPPOE_CONNECTED: 1640 printf("pppoe: sendpacket: unexpected state\n"); 1641 break; 1642 1643 case PPPOE_NEWCONNECTED: 1644 /* send the PADS without a timeout - we're now connected */ 1645 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1646 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1647 break; 1648 1649 case PPPOE_PRIMED: 1650 /* No packet to send, but set up the timeout */ 1651 neg->timeout_handle = timeout(pppoe_ticker, 1652 hook, PPPOE_OFFER_TIMEOUT * hz); 1653 break; 1654 1655 case PPPOE_SOFFER: 1656 /* 1657 * send the offer but if they don't respond 1658 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1659 */ 1660 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1661 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1662 neg->timeout_handle = timeout(pppoe_ticker, 1663 hook, PPPOE_OFFER_TIMEOUT * hz); 1664 break; 1665 1666 case PPPOE_SINIT: 1667 case PPPOE_SREQ: 1668 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1669 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1670 neg->timeout_handle = timeout(pppoe_ticker, hook, 1671 (hz * PPPOE_INITIAL_TIMEOUT)); 1672 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1673 break; 1674 1675 default: 1676 error = EINVAL; 1677 printf("pppoe: timeout: bad state\n"); 1678 } 1679 /* return (error); */ 1680 } 1681 1682 /* 1683 * Parse an incoming packet to see if any tags should be copied to the 1684 * output packet. Don't do any tags that have been handled in the main 1685 * state machine. 1686 */ 1687 static const struct pppoe_tag* 1688 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1689 { 1690 const char *const end = (const char *)next_tag(ph); 1691 const char *ptn; 1692 const struct pppoe_tag *pt = &ph->tag[0]; 1693 /* 1694 * Keep processing tags while a tag header will still fit. 1695 */ 1696 AAA 1697 while((const char*)(pt + 1) <= end) { 1698 /* 1699 * If the tag data would go past the end of the packet, abort. 1700 */ 1701 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1702 if(ptn > end) 1703 return NULL; 1704 1705 switch (pt->tag_type) { 1706 case PTT_RELAY_SID: 1707 insert_tag(sp, pt); 1708 break; 1709 case PTT_EOL: 1710 return NULL; 1711 case PTT_SRV_NAME: 1712 case PTT_AC_NAME: 1713 case PTT_HOST_UNIQ: 1714 case PTT_AC_COOKIE: 1715 case PTT_VENDOR: 1716 case PTT_SRV_ERR: 1717 case PTT_SYS_ERR: 1718 case PTT_GEN_ERR: 1719 break; 1720 } 1721 pt = (const struct pppoe_tag*)ptn; 1722 } 1723 return NULL; 1724 } 1725 1726 static int 1727 pppoe_send_event(sessp sp, enum cmd cmdid) 1728 { 1729 int error; 1730 struct ng_mesg *msg; 1731 struct ngpppoe_sts *sts; 1732 1733 AAA 1734 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1735 sizeof(struct ngpppoe_sts), M_NOWAIT); 1736 if (msg == NULL) 1737 return (ENOMEM); 1738 sts = (struct ngpppoe_sts *)msg->data; 1739 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKLEN + 1); 1740 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1741 return (error); 1742 }
Cache object: 79a6d5f033be41aa827c9a58a9c2cdeb
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