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sys/netgraph/ng_pppoe.c
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1 /* 2 * ng_pppoe.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: releng/6.0/sys/netgraph/ng_pppoe.c 150384 2005-09-20 13:46:15Z glebius $ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 #if 0 44 #define DBG do { printf("ng_device: %s\n", __func__ ); } while (0) 45 #else 46 #define DBG do {} while (0) 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/mbuf.h> 53 #include <sys/malloc.h> 54 #include <sys/errno.h> 55 #include <sys/syslog.h> 56 #include <net/ethernet.h> 57 58 #include <netgraph/ng_message.h> 59 #include <netgraph/netgraph.h> 60 #include <netgraph/ng_parse.h> 61 #include <netgraph/ng_pppoe.h> 62 63 #ifdef NG_SEPARATE_MALLOC 64 MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 65 #else 66 #define M_NETGRAPH_PPPOE M_NETGRAPH 67 #endif 68 69 #define SIGNOFF "session closed" 70 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 71 72 /* 73 * This section contains the netgraph method declarations for the 74 * pppoe node. These methods define the netgraph pppoe 'type'. 75 */ 76 77 static ng_constructor_t ng_pppoe_constructor; 78 static ng_rcvmsg_t ng_pppoe_rcvmsg; 79 static ng_shutdown_t ng_pppoe_shutdown; 80 static ng_newhook_t ng_pppoe_newhook; 81 static ng_rcvdata_t ng_pppoe_rcvdata; 82 static ng_disconnect_t ng_pppoe_disconnect; 83 84 /* Parse type for struct ngpppoe_init_data */ 85 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 86 = NG_PPPOE_INIT_DATA_TYPE_INFO; 87 static const struct ng_parse_type ngpppoe_init_data_state_type = { 88 &ng_parse_struct_type, 89 &ngpppoe_init_data_type_fields 90 }; 91 92 /* Parse type for struct ngpppoe_sts */ 93 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 94 = NG_PPPOE_STS_TYPE_INFO; 95 static const struct ng_parse_type ng_pppoe_sts_state_type = { 96 &ng_parse_struct_type, 97 &ng_pppoe_sts_type_fields 98 }; 99 100 /* List of commands and how to convert arguments to/from ASCII */ 101 static const struct ng_cmdlist ng_pppoe_cmds[] = { 102 { 103 NGM_PPPOE_COOKIE, 104 NGM_PPPOE_CONNECT, 105 "pppoe_connect", 106 &ngpppoe_init_data_state_type, 107 NULL 108 }, 109 { 110 NGM_PPPOE_COOKIE, 111 NGM_PPPOE_LISTEN, 112 "pppoe_listen", 113 &ngpppoe_init_data_state_type, 114 NULL 115 }, 116 { 117 NGM_PPPOE_COOKIE, 118 NGM_PPPOE_OFFER, 119 "pppoe_offer", 120 &ngpppoe_init_data_state_type, 121 NULL 122 }, 123 { 124 NGM_PPPOE_COOKIE, 125 NGM_PPPOE_SERVICE, 126 "pppoe_service", 127 &ngpppoe_init_data_state_type, 128 NULL 129 }, 130 { 131 NGM_PPPOE_COOKIE, 132 NGM_PPPOE_SUCCESS, 133 "pppoe_success", 134 &ng_pppoe_sts_state_type, 135 NULL 136 }, 137 { 138 NGM_PPPOE_COOKIE, 139 NGM_PPPOE_FAIL, 140 "pppoe_fail", 141 &ng_pppoe_sts_state_type, 142 NULL 143 }, 144 { 145 NGM_PPPOE_COOKIE, 146 NGM_PPPOE_CLOSE, 147 "pppoe_close", 148 &ng_pppoe_sts_state_type, 149 NULL 150 }, 151 { 152 NGM_PPPOE_COOKIE, 153 NGM_PPPOE_SETMODE, 154 "pppoe_setmode", 155 &ng_parse_string_type, 156 NULL 157 }, 158 { 159 NGM_PPPOE_COOKIE, 160 NGM_PPPOE_GETMODE, 161 "pppoe_getmode", 162 NULL, 163 &ng_parse_string_type 164 }, 165 { 0 } 166 }; 167 168 /* Netgraph node type descriptor */ 169 static struct ng_type typestruct = { 170 .version = NG_ABI_VERSION, 171 .name = NG_PPPOE_NODE_TYPE, 172 .constructor = ng_pppoe_constructor, 173 .rcvmsg = ng_pppoe_rcvmsg, 174 .shutdown = ng_pppoe_shutdown, 175 .newhook = ng_pppoe_newhook, 176 .rcvdata = ng_pppoe_rcvdata, 177 .disconnect = ng_pppoe_disconnect, 178 .cmdlist = ng_pppoe_cmds, 179 }; 180 NETGRAPH_INIT(pppoe, &typestruct); 181 182 /* 183 * States for the session state machine. 184 * These have no meaning if there is no hook attached yet. 185 */ 186 enum state { 187 PPPOE_SNONE=0, /* [both] Initial state */ 188 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 189 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 190 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 191 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 192 PPPOE_SREQ, /* [Client] Sent a Request */ 193 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 194 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 195 PPPOE_DEAD /* [Both] */ 196 }; 197 198 #define NUMTAGS 20 /* number of tags we are set up to work with */ 199 200 /* 201 * Information we store for each hook on each node for negotiating the 202 * session. The mbuf and cluster are freed once negotiation has completed. 203 * The whole negotiation block is then discarded. 204 */ 205 206 struct sess_neg { 207 struct mbuf *m; /* holds cluster with last sent packet */ 208 union packet *pkt; /* points within the above cluster */ 209 struct callout handle; /* see timeout(9) */ 210 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 211 u_int numtags; 212 const struct pppoe_tag *tags[NUMTAGS]; 213 u_int service_len; 214 u_int ac_name_len; 215 216 struct datatag service; 217 struct datatag ac_name; 218 }; 219 typedef struct sess_neg *negp; 220 221 /* 222 * Session information that is needed after connection. 223 */ 224 struct sess_con { 225 hook_p hook; 226 u_int16_t Session_ID; 227 enum state state; 228 ng_ID_t creator; /* who to notify */ 229 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 230 negp neg; /* used when negotiating */ 231 /*struct sess_con *hash_next;*/ /* not yet used */ 232 }; 233 typedef struct sess_con *sessp; 234 235 #define NG_PPPOE_SESSION_NODE(sp) NG_HOOK_NODE(sp->hook) 236 237 enum { 238 PPPOE_STANDARD = 1, /* standard RFC2516 mode */ 239 PPPOE_NONSTANDARD, /* 3Com proprietary mode */ 240 }; 241 242 struct ng_pppoe_mode_t { 243 u_int8_t id; 244 const struct ether_header *eh_prototype; 245 const char *name; 246 }; 247 248 static const struct ether_header eh_standard = 249 {{0xff,0xff,0xff,0xff,0xff,0xff}, 250 {0x00,0x00,0x00,0x00,0x00,0x00}, 251 ETHERTYPE_PPPOE_DISC}; 252 253 static const struct ether_header eh_3Com = 254 {{0xff,0xff,0xff,0xff,0xff,0xff}, 255 {0x00,0x00,0x00,0x00,0x00,0x00}, 256 ETHERTYPE_PPPOE_STUPID_DISC}; 257 258 static const struct ng_pppoe_mode_t ng_pppoe_modes[] = { 259 { PPPOE_STANDARD, &eh_standard, NG_PPPOE_STANDARD }, 260 { PPPOE_NONSTANDARD, &eh_3Com, NG_PPPOE_NONSTANDARD }, 261 { 0, NULL}, 262 }; 263 264 /* 265 * Information we store for each node 266 */ 267 struct PPPOE { 268 node_p node; /* back pointer to node */ 269 hook_p ethernet_hook; 270 hook_p debug_hook; 271 u_int packets_in; /* packets in from ethernet */ 272 u_int packets_out; /* packets out towards ethernet */ 273 u_int32_t flags; 274 const struct ng_pppoe_mode_t *mode; /* standard PPPoE or 3Com? */ 275 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 276 }; 277 typedef struct PPPOE *priv_p; 278 279 union uniq { 280 char bytes[sizeof(void *)]; 281 void * pointer; 282 }; 283 284 #define LEAVE(x) do { error = x; goto quit; } while(0) 285 static void pppoe_start(sessp sp); 286 static void sendpacket(sessp sp); 287 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 288 static const struct pppoe_tag *scan_tags(sessp sp, 289 const struct pppoe_hdr* ph); 290 static int pppoe_send_event(sessp sp, enum cmd cmdid); 291 292 /************************************************************************* 293 * Some basic utilities from the Linux version with author's permission.* 294 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 295 ************************************************************************/ 296 297 /* 298 * Generate a new session id 299 * XXX find out the FreeBSD locking scheme. 300 */ 301 static u_int16_t 302 get_new_sid(node_p node) 303 { 304 static int pppoe_sid = 10; 305 sessp sp; 306 hook_p hook; 307 u_int16_t val; 308 priv_p privp = NG_NODE_PRIVATE(node); 309 310 DBG; 311 restart: 312 val = pppoe_sid++; 313 /* 314 * Spec says 0xFFFF is reserved. 315 * Also don't use 0x0000 316 */ 317 if (val == 0xffff) { 318 pppoe_sid = 20; 319 goto restart; 320 } 321 322 /* Check it isn't already in use */ 323 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 324 /* don't check special hooks */ 325 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 326 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 327 continue; 328 sp = NG_HOOK_PRIVATE(hook); 329 if (sp->Session_ID == val) 330 goto restart; 331 } 332 333 return val; 334 } 335 336 337 /* 338 * Return the location where the next tag can be put 339 */ 340 static __inline const struct pppoe_tag* 341 next_tag(const struct pppoe_hdr* ph) 342 { 343 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 344 + ntohs(ph->length)); 345 } 346 347 /* 348 * Look for a tag of a specific type 349 * Don't trust any length the other end says. 350 * but assume we already sanity checked ph->length. 351 */ 352 static const struct pppoe_tag* 353 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 354 { 355 const char *const end = (const char *)next_tag(ph); 356 const char *ptn; 357 const struct pppoe_tag *pt = &ph->tag[0]; 358 /* 359 * Keep processing tags while a tag header will still fit. 360 */ 361 DBG; 362 while((const char*)(pt + 1) <= end) { 363 /* 364 * If the tag data would go past the end of the packet, abort. 365 */ 366 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 367 if(ptn > end) 368 return NULL; 369 370 if(pt->tag_type == idx) 371 return pt; 372 373 pt = (const struct pppoe_tag*)ptn; 374 } 375 return NULL; 376 } 377 378 /************************************************************************** 379 * inlines to initialise or add tags to a session's tag list, 380 **************************************************************************/ 381 /* 382 * Initialise the session's tag list 383 */ 384 static void 385 init_tags(sessp sp) 386 { 387 DBG; 388 if(sp->neg == NULL) { 389 printf("pppoe: asked to init NULL neg pointer\n"); 390 return; 391 } 392 sp->neg->numtags = 0; 393 } 394 395 static void 396 insert_tag(sessp sp, const struct pppoe_tag *tp) 397 { 398 int i; 399 negp neg; 400 401 DBG; 402 if((neg = sp->neg) == NULL) { 403 printf("pppoe: asked to use NULL neg pointer\n"); 404 return; 405 } 406 if ((i = neg->numtags++) < NUMTAGS) { 407 neg->tags[i] = tp; 408 } else { 409 printf("pppoe: asked to add too many tags to packet\n"); 410 neg->numtags--; 411 } 412 } 413 414 /* 415 * Make up a packet, using the tags filled out for the session. 416 * 417 * Assume that the actual pppoe header and ethernet header 418 * are filled out externally to this routine. 419 * Also assume that neg->wh points to the correct 420 * location at the front of the buffer space. 421 */ 422 static void 423 make_packet(sessp sp) { 424 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 425 const struct pppoe_tag **tag; 426 char *dp; 427 int count; 428 int tlen; 429 u_int16_t length = 0; 430 431 DBG; 432 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 433 printf("pppoe: make_packet called from wrong state\n"); 434 } 435 dp = (char *)wh->ph.tag; 436 for (count = 0, tag = sp->neg->tags; 437 ((count < sp->neg->numtags) && (count < NUMTAGS)); 438 tag++, count++) { 439 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 440 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 441 printf("pppoe: tags too long\n"); 442 sp->neg->numtags = count; 443 break; /* XXX chop off what's too long */ 444 } 445 bcopy(*tag, (char *)dp, tlen); 446 length += tlen; 447 dp += tlen; 448 } 449 wh->ph.length = htons(length); 450 sp->neg->m->m_len = length + sizeof(*wh); 451 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 452 } 453 454 /************************************************************************** 455 * Routine to match a service offered * 456 **************************************************************************/ 457 /* 458 * Find a hook that has a service string that matches that 459 * we are seeking. for now use a simple string. 460 * In the future we may need something like regexp(). 461 * for testing allow a null string to match 1st found and a null service 462 * to match all requests. Also make '*' do the same. 463 */ 464 465 #define NG_MATCH_EXACT 1 466 #define NG_MATCH_ANY 2 467 468 static hook_p 469 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 470 { 471 sessp sp = NULL; 472 negp neg = NULL; 473 priv_p privp = NG_NODE_PRIVATE(node); 474 hook_p allhook = NULL; 475 hook_p hook; 476 477 DBG; 478 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 479 480 /* skip any hook that is debug or ethernet */ 481 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 482 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 483 continue; 484 sp = NG_HOOK_PRIVATE(hook); 485 486 /* Skip any sessions which are not in LISTEN mode. */ 487 if ( sp->state != PPPOE_LISTENING) 488 continue; 489 490 neg = sp->neg; 491 492 /* Special case for a blank or "*" service name (wildcard) */ 493 if (match == NG_MATCH_ANY && neg->service_len == 1 && 494 neg->service.data[0] == '*') { 495 allhook = hook; 496 continue; 497 } 498 499 /* If the lengths don't match, that aint it. */ 500 if (neg->service_len != svc_len) 501 continue; 502 503 /* An exact match? */ 504 if (svc_len == 0) 505 break; 506 507 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 508 break; 509 } 510 return (hook ? hook : allhook); 511 } 512 /************************************************************************** 513 * Routine to find a particular session that matches an incoming packet * 514 **************************************************************************/ 515 static hook_p 516 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 517 { 518 sessp sp = NULL; 519 hook_p hook = NULL; 520 priv_p privp = NG_NODE_PRIVATE(node); 521 u_int16_t session = ntohs(wh->ph.sid); 522 523 /* 524 * find matching peer/session combination. 525 */ 526 DBG; 527 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 528 /* don't check special hooks */ 529 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 530 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 531 continue; 532 } 533 sp = NG_HOOK_PRIVATE(hook); 534 if ( ( (sp->state == PPPOE_CONNECTED) 535 || (sp->state == PPPOE_NEWCONNECTED) ) 536 && (sp->Session_ID == session) 537 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 538 wh->eh.ether_shost, 539 ETHER_ADDR_LEN)) == 0) { 540 break; 541 } 542 } 543 return (hook); 544 } 545 546 static hook_p 547 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 548 { 549 hook_p hook = NULL; 550 priv_p privp = NG_NODE_PRIVATE(node); 551 union uniq uniq; 552 553 DBG; 554 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 555 /* cycle through all known hooks */ 556 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 557 /* don't check special hooks */ 558 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 559 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 560 continue; 561 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 562 break; 563 } 564 return (hook); 565 } 566 567 /************************************************************************** 568 * start of Netgraph entrypoints * 569 **************************************************************************/ 570 571 /* 572 * Allocate the private data structure and the generic node 573 * and link them together. 574 * 575 * ng_make_node_common() returns with a generic node struct 576 * with a single reference for us.. we transfer it to the 577 * private structure.. when we free the private struct we must 578 * unref the node so it gets freed too. 579 */ 580 static int 581 ng_pppoe_constructor(node_p node) 582 { 583 priv_p privdata; 584 585 DBG; 586 /* Initialize private descriptor */ 587 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 588 M_NOWAIT | M_ZERO); 589 if (privdata == NULL) 590 return (ENOMEM); 591 592 /* Link structs together; this counts as our one reference to *nodep */ 593 NG_NODE_SET_PRIVATE(node, privdata); 594 privdata->node = node; 595 596 /* Initialize to standard mode (the first one in ng_pppoe_modes[]). */ 597 privdata->mode = &ng_pppoe_modes[0]; 598 599 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 DBG; 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 DBG; 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 ng_callout_init(&neg->handle); 754 neg->m->m_len = sizeof(struct pppoe_full_hdr); 755 neg->pkt = mtod(neg->m, union packet*); 756 memcpy((void *)&neg->pkt->pkt_header.eh, 757 (const void *)privp->mode->eh_prototype, 758 sizeof(struct ether_header)); 759 neg->pkt->pkt_header.ph.ver = 0x1; 760 neg->pkt->pkt_header.ph.type = 0x1; 761 neg->pkt->pkt_header.ph.sid = 0x0000; 762 neg->timeout = 0; 763 764 sp->creator = NGI_RETADDR(item); 765 } 766 switch (msg->header.cmd) { 767 case NGM_PPPOE_GET_STATUS: 768 { 769 struct ngpppoestat *stats; 770 771 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 772 if (!resp) { 773 LEAVE(ENOMEM); 774 } 775 stats = (struct ngpppoestat *) resp->data; 776 stats->packets_in = privp->packets_in; 777 stats->packets_out = privp->packets_out; 778 break; 779 } 780 case NGM_PPPOE_CONNECT: 781 /* 782 * Check the hook exists and is Uninitialised. 783 * Send a PADI request, and start the timeout logic. 784 * Store the originator of this message so we can send 785 * a success of fail message to them later. 786 * Move the session to SINIT 787 * Set up the session to the correct state and 788 * start it. 789 */ 790 neg->service.hdr.tag_type = PTT_SRV_NAME; 791 neg->service.hdr.tag_len = 792 htons((u_int16_t)ourmsg->data_len); 793 if (ourmsg->data_len) 794 bcopy(ourmsg->data, neg->service.data, 795 ourmsg->data_len); 796 neg->service_len = ourmsg->data_len; 797 pppoe_start(sp); 798 break; 799 case NGM_PPPOE_LISTEN: 800 /* 801 * Check the hook exists and is Uninitialised. 802 * Install the service matching string. 803 * Store the originator of this message so we can send 804 * a success of fail message to them later. 805 * Move the hook to 'LISTENING' 806 */ 807 neg->service.hdr.tag_type = PTT_SRV_NAME; 808 neg->service.hdr.tag_len = 809 htons((u_int16_t)ourmsg->data_len); 810 811 if (ourmsg->data_len) 812 bcopy(ourmsg->data, neg->service.data, 813 ourmsg->data_len); 814 neg->service_len = ourmsg->data_len; 815 neg->pkt->pkt_header.ph.code = PADT_CODE; 816 /* 817 * wait for PADI packet coming from ethernet 818 */ 819 sp->state = PPPOE_LISTENING; 820 break; 821 case NGM_PPPOE_OFFER: 822 /* 823 * Check the hook exists and is Uninitialised. 824 * Store the originator of this message so we can send 825 * a success of fail message to them later. 826 * Store the AC-Name given and go to PRIMED. 827 */ 828 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 829 neg->ac_name.hdr.tag_len = 830 htons((u_int16_t)ourmsg->data_len); 831 if (ourmsg->data_len) 832 bcopy(ourmsg->data, neg->ac_name.data, 833 ourmsg->data_len); 834 neg->ac_name_len = ourmsg->data_len; 835 neg->pkt->pkt_header.ph.code = PADO_CODE; 836 /* 837 * Wait for PADI packet coming from hook 838 */ 839 sp->state = PPPOE_PRIMED; 840 break; 841 case NGM_PPPOE_SERVICE: 842 /* 843 * Check the session is primed. 844 * for now just allow ONE service to be advertised. 845 * If you do it twice you just overwrite. 846 */ 847 if (sp->state != PPPOE_PRIMED) { 848 printf("pppoe: Session not primed\n"); 849 LEAVE(EISCONN); 850 } 851 neg = sp->neg; 852 neg->service.hdr.tag_type = PTT_SRV_NAME; 853 neg->service.hdr.tag_len = 854 htons((u_int16_t)ourmsg->data_len); 855 856 if (ourmsg->data_len) 857 bcopy(ourmsg->data, neg->service.data, 858 ourmsg->data_len); 859 neg->service_len = ourmsg->data_len; 860 break; 861 case NGM_PPPOE_SETMODE: 862 { 863 const struct ng_pppoe_mode_t *mode; 864 char *s; 865 size_t len; 866 867 if (msg->header.arglen == 0) 868 LEAVE(EINVAL); 869 870 s = (char *)msg->data; 871 len = msg->header.arglen - 1; 872 873 /* Search for matching mode string */ 874 for (mode = ng_pppoe_modes; mode->id != 0; mode++ ) 875 if ((strlen(mode->name) == len) && 876 !strncmp(mode->name, s, len)) 877 break; /* found */ 878 879 if (mode->id != 0) 880 privp->mode = mode; 881 else 882 LEAVE(EINVAL); 883 break; 884 } 885 case NGM_PPPOE_GETMODE: 886 NG_MKRESPONSE(resp, msg, strlen(privp->mode->name) + 1, 887 M_NOWAIT); 888 if (resp == NULL) 889 LEAVE(ENOMEM); 890 strlcpy((char *)resp->data, privp->mode->name, 891 strlen(privp->mode->name) + 1); 892 break; 893 default: 894 LEAVE(EINVAL); 895 } 896 break; 897 default: 898 LEAVE(EINVAL); 899 } 900 901 /* Take care of synchronous response, if any */ 902 quit: 903 NG_RESPOND_MSG(error, node, item, resp); 904 /* Free the message and return */ 905 NG_FREE_MSG(msg); 906 return(error); 907 } 908 909 /* 910 * Start a client into the first state. A separate function because 911 * it can be needed if the negotiation times out. 912 */ 913 static void 914 pppoe_start(sessp sp) 915 { 916 priv_p privp = NG_NODE_PRIVATE(NG_PPPOE_SESSION_NODE(sp)); 917 struct { 918 struct pppoe_tag hdr; 919 union uniq data; 920 } __packed uniqtag; 921 922 /* 923 * kick the state machine into starting up 924 */ 925 DBG; 926 sp->state = PPPOE_SINIT; 927 /* Reset the packet header to broadcast. Since we are in a client 928 * mode use configured ethertype. */ 929 memcpy((void *)&sp->neg->pkt->pkt_header.eh, 930 (const void *)privp->mode->eh_prototype, 931 sizeof(struct ether_header)); 932 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 933 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 934 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 935 uniqtag.data.pointer = sp; 936 init_tags(sp); 937 insert_tag(sp, &uniqtag.hdr); 938 insert_tag(sp, &sp->neg->service.hdr); 939 make_packet(sp); 940 sendpacket(sp); 941 } 942 943 static int 944 send_acname(sessp sp, const struct pppoe_tag *tag) 945 { 946 int error, tlen; 947 struct ng_mesg *msg; 948 struct ngpppoe_sts *sts; 949 950 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 951 sizeof(struct ngpppoe_sts), M_NOWAIT); 952 if (msg == NULL) 953 return (ENOMEM); 954 955 sts = (struct ngpppoe_sts *)msg->data; 956 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 957 strncpy(sts->hook, tag->tag_data, tlen); 958 sts->hook[tlen] = '\0'; 959 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 960 961 return (error); 962 } 963 964 static int 965 send_sessionid(sessp sp) 966 { 967 int error; 968 struct ng_mesg *msg; 969 970 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 971 sizeof(u_int16_t), M_NOWAIT); 972 if (msg == NULL) 973 return (ENOMEM); 974 975 *(u_int16_t *)msg->data = sp->Session_ID; 976 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 977 978 return (error); 979 } 980 981 /* 982 * Receive data, and do something with it. 983 * The caller will never free m, so if we use up this data 984 * or abort we must free it. 985 */ 986 static int 987 ng_pppoe_rcvdata(hook_p hook, item_p item) 988 { 989 node_p node = NG_HOOK_NODE(hook); 990 const priv_p privp = NG_NODE_PRIVATE(node); 991 sessp sp = NG_HOOK_PRIVATE(hook); 992 const struct pppoe_full_hdr *wh; 993 const struct pppoe_hdr *ph; 994 int error = 0; 995 u_int16_t session; 996 u_int16_t length; 997 u_int8_t code; 998 const struct pppoe_tag *utag = NULL, *tag = NULL; 999 hook_p sendhook; 1000 struct { 1001 struct pppoe_tag hdr; 1002 union uniq data; 1003 } __packed uniqtag; 1004 negp neg = NULL; 1005 struct mbuf *m; 1006 1007 DBG; 1008 NGI_GET_M(item, m); 1009 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1010 /* 1011 * Data from the debug hook gets sent without modification 1012 * straight to the ethernet. 1013 */ 1014 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 1015 privp->packets_out++; 1016 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1017 /* 1018 * Incoming data. 1019 * Dig out various fields from the packet. 1020 * use them to decide where to send it. 1021 */ 1022 1023 privp->packets_in++; 1024 if( m->m_len < sizeof(*wh)) { 1025 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1026 if (m == NULL) { 1027 printf("couldn't m_pullup\n"); 1028 LEAVE(ENOBUFS); 1029 } 1030 } 1031 wh = mtod(m, struct pppoe_full_hdr *); 1032 length = ntohs(wh->ph.length); 1033 switch(wh->eh.ether_type) { 1034 case ETHERTYPE_PPPOE_STUPID_DISC: /* fall through */ 1035 case ETHERTYPE_PPPOE_DISC: 1036 /* 1037 * We need to try to make sure that the tag area 1038 * is contiguous, or we could wander off the end 1039 * of a buffer and make a mess. 1040 * (Linux wouldn't have this problem). 1041 */ 1042 if (m->m_pkthdr.len <= MHLEN) { 1043 if( m->m_len < m->m_pkthdr.len) { 1044 m = m_pullup(m, m->m_pkthdr.len); 1045 if (m == NULL) { 1046 printf("couldn't m_pullup\n"); 1047 LEAVE(ENOBUFS); 1048 } 1049 } 1050 } 1051 if (m->m_len != m->m_pkthdr.len) { 1052 /* 1053 * It's not all in one piece. 1054 * We need to do extra work. 1055 * Put it into a cluster. 1056 */ 1057 struct mbuf *n; 1058 n = m_dup(m, M_DONTWAIT); 1059 m_freem(m); 1060 m = n; 1061 if (m) { 1062 /* just check we got a cluster */ 1063 if (m->m_len != m->m_pkthdr.len) { 1064 m_freem(m); 1065 m = NULL; 1066 } 1067 } 1068 if (m == NULL) { 1069 printf("packet fragmented\n"); 1070 LEAVE(EMSGSIZE); 1071 } 1072 } 1073 wh = mtod(m, struct pppoe_full_hdr *); 1074 length = ntohs(wh->ph.length); 1075 ph = &wh->ph; 1076 session = ntohs(wh->ph.sid); 1077 code = wh->ph.code; 1078 1079 switch(code) { 1080 case PADI_CODE: 1081 /* 1082 * We are a server: 1083 * Look for a hook with the required service 1084 * and send the ENTIRE packet up there. 1085 * It should come back to a new hook in 1086 * PRIMED state. Look there for further 1087 * processing. 1088 */ 1089 tag = get_tag(ph, PTT_SRV_NAME); 1090 if (tag == NULL) { 1091 printf("no service tag\n"); 1092 LEAVE(ENETUNREACH); 1093 } 1094 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1095 tag->tag_data, ntohs(tag->tag_len), 1096 NG_MATCH_ANY); 1097 if (sendhook) { 1098 NG_FWD_NEW_DATA(error, item, 1099 sendhook, m); 1100 } else { 1101 LEAVE(ENETUNREACH); 1102 } 1103 break; 1104 case PADO_CODE: 1105 /* 1106 * We are a client: 1107 * Use the host_uniq tag to find the 1108 * hook this is in response to. 1109 * Received #2, now send #3 1110 * For now simply accept the first we receive. 1111 */ 1112 utag = get_tag(ph, PTT_HOST_UNIQ); 1113 if ((utag == NULL) 1114 || (ntohs(utag->tag_len) != sizeof(sp))) { 1115 printf("no host unique field\n"); 1116 LEAVE(ENETUNREACH); 1117 } 1118 1119 sendhook = pppoe_finduniq(node, utag); 1120 if (sendhook == NULL) { 1121 printf("no matching session\n"); 1122 LEAVE(ENETUNREACH); 1123 } 1124 1125 /* 1126 * Check the session is in the right state. 1127 * It needs to be in PPPOE_SINIT. 1128 */ 1129 sp = NG_HOOK_PRIVATE(sendhook); 1130 if (sp->state != PPPOE_SINIT) { 1131 printf("session in wrong state\n"); 1132 LEAVE(ENETUNREACH); 1133 } 1134 neg = sp->neg; 1135 ng_uncallout(&neg->handle, node); 1136 1137 /* 1138 * This is the first time we hear 1139 * from the server, so note it's 1140 * unicast address, replacing the 1141 * broadcast address . 1142 */ 1143 bcopy(wh->eh.ether_shost, 1144 neg->pkt->pkt_header.eh.ether_dhost, 1145 ETHER_ADDR_LEN); 1146 neg->timeout = 0; 1147 neg->pkt->pkt_header.ph.code = PADR_CODE; 1148 init_tags(sp); 1149 insert_tag(sp, utag); /* Host Unique */ 1150 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1151 insert_tag(sp, tag); /* return cookie */ 1152 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1153 insert_tag(sp, tag); /* return it */ 1154 send_acname(sp, tag); 1155 } 1156 insert_tag(sp, &neg->service.hdr); /* Service */ 1157 scan_tags(sp, ph); 1158 make_packet(sp); 1159 sp->state = PPPOE_SREQ; 1160 sendpacket(sp); 1161 break; 1162 case PADR_CODE: 1163 1164 /* 1165 * We are a server: 1166 * Use the ac_cookie tag to find the 1167 * hook this is in response to. 1168 */ 1169 utag = get_tag(ph, PTT_AC_COOKIE); 1170 if ((utag == NULL) 1171 || (ntohs(utag->tag_len) != sizeof(sp))) { 1172 LEAVE(ENETUNREACH); 1173 } 1174 1175 sendhook = pppoe_finduniq(node, utag); 1176 if (sendhook == NULL) { 1177 LEAVE(ENETUNREACH); 1178 } 1179 1180 /* 1181 * Check the session is in the right state. 1182 * It needs to be in PPPOE_SOFFER 1183 * or PPPOE_NEWCONNECTED. If the latter, 1184 * then this is a retry by the client. 1185 * so be nice, and resend. 1186 */ 1187 sp = NG_HOOK_PRIVATE(sendhook); 1188 if (sp->state == PPPOE_NEWCONNECTED) { 1189 /* 1190 * Whoa! drop back to resend that 1191 * PADS packet. 1192 * We should still have a copy of it. 1193 */ 1194 sp->state = PPPOE_SOFFER; 1195 } 1196 if (sp->state != PPPOE_SOFFER) { 1197 LEAVE (ENETUNREACH); 1198 break; 1199 } 1200 neg = sp->neg; 1201 ng_uncallout(&neg->handle, node); 1202 neg->pkt->pkt_header.ph.code = PADS_CODE; 1203 if (sp->Session_ID == 0) 1204 neg->pkt->pkt_header.ph.sid = 1205 htons(sp->Session_ID 1206 = get_new_sid(node)); 1207 send_sessionid(sp); 1208 neg->timeout = 0; 1209 /* 1210 * start working out the tags to respond with. 1211 */ 1212 init_tags(sp); 1213 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1214 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1215 insert_tag(sp, tag);/* return service */ 1216 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1217 insert_tag(sp, tag); /* return it */ 1218 insert_tag(sp, utag); /* ac_cookie */ 1219 scan_tags(sp, ph); 1220 make_packet(sp); 1221 sp->state = PPPOE_NEWCONNECTED; 1222 sendpacket(sp); 1223 /* 1224 * Having sent the last Negotiation header, 1225 * Set up the stored packet header to 1226 * be correct for the actual session. 1227 * But keep the negotialtion stuff 1228 * around in case we need to resend this last 1229 * packet. We'll discard it when we move 1230 * from NEWCONNECTED to CONNECTED 1231 */ 1232 sp->pkt_hdr = neg->pkt->pkt_header; 1233 /* Configure ethertype depending on what 1234 * ethertype was used at discovery phase */ 1235 if (sp->pkt_hdr.eh.ether_type == 1236 ETHERTYPE_PPPOE_STUPID_DISC) 1237 sp->pkt_hdr.eh.ether_type 1238 = ETHERTYPE_PPPOE_STUPID_SESS; 1239 else 1240 sp->pkt_hdr.eh.ether_type 1241 = ETHERTYPE_PPPOE_SESS; 1242 sp->pkt_hdr.ph.code = 0; 1243 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1244 break; 1245 case PADS_CODE: 1246 /* 1247 * We are a client: 1248 * Use the host_uniq tag to find the 1249 * hook this is in response to. 1250 * take the session ID and store it away. 1251 * Also make sure the pre-made header is 1252 * correct and set us into Session mode. 1253 */ 1254 utag = get_tag(ph, PTT_HOST_UNIQ); 1255 if ((utag == NULL) 1256 || (ntohs(utag->tag_len) != sizeof(sp))) { 1257 LEAVE (ENETUNREACH); 1258 break; 1259 } 1260 sendhook = pppoe_finduniq(node, utag); 1261 if (sendhook == NULL) { 1262 LEAVE(ENETUNREACH); 1263 } 1264 1265 /* 1266 * Check the session is in the right state. 1267 * It needs to be in PPPOE_SREQ. 1268 */ 1269 sp = NG_HOOK_PRIVATE(sendhook); 1270 if (sp->state != PPPOE_SREQ) { 1271 LEAVE(ENETUNREACH); 1272 } 1273 neg = sp->neg; 1274 ng_uncallout(&neg->handle, node); 1275 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1276 sp->Session_ID = ntohs(wh->ph.sid); 1277 send_sessionid(sp); 1278 neg->timeout = 0; 1279 sp->state = PPPOE_CONNECTED; 1280 /* 1281 * Now we have gone to Connected mode, 1282 * Free all resources needed for 1283 * negotiation. 1284 * Keep a copy of the header we will be using. 1285 */ 1286 sp->pkt_hdr = neg->pkt->pkt_header; 1287 if (privp->mode->id == PPPOE_NONSTANDARD) 1288 sp->pkt_hdr.eh.ether_type 1289 = ETHERTYPE_PPPOE_STUPID_SESS; 1290 else 1291 sp->pkt_hdr.eh.ether_type 1292 = ETHERTYPE_PPPOE_SESS; 1293 sp->pkt_hdr.ph.code = 0; 1294 m_freem(neg->m); 1295 FREE(sp->neg, M_NETGRAPH_PPPOE); 1296 sp->neg = NULL; 1297 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1298 break; 1299 case PADT_CODE: 1300 /* 1301 * Send a 'close' message to the controlling 1302 * process (the one that set us up); 1303 * And then tear everything down. 1304 * 1305 * Find matching peer/session combination. 1306 */ 1307 sendhook = pppoe_findsession(node, wh); 1308 if (sendhook == NULL) { 1309 LEAVE(ENETUNREACH); 1310 } 1311 /* send message to creator */ 1312 /* close hook */ 1313 if (sendhook) { 1314 ng_rmhook_self(sendhook); 1315 } 1316 break; 1317 default: 1318 LEAVE(EPFNOSUPPORT); 1319 } 1320 break; 1321 case ETHERTYPE_PPPOE_STUPID_SESS: 1322 case ETHERTYPE_PPPOE_SESS: 1323 /* 1324 * find matching peer/session combination. 1325 */ 1326 sendhook = pppoe_findsession(node, wh); 1327 if (sendhook == NULL) { 1328 LEAVE (ENETUNREACH); 1329 break; 1330 } 1331 sp = NG_HOOK_PRIVATE(sendhook); 1332 m_adj(m, sizeof(*wh)); 1333 if (m->m_pkthdr.len < length) { 1334 /* Packet too short, dump it */ 1335 LEAVE(EMSGSIZE); 1336 } 1337 1338 /* Also need to trim excess at the end */ 1339 if (m->m_pkthdr.len > length) { 1340 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1341 } 1342 if ( sp->state != PPPOE_CONNECTED) { 1343 if (sp->state == PPPOE_NEWCONNECTED) { 1344 sp->state = PPPOE_CONNECTED; 1345 /* 1346 * Now we have gone to Connected mode, 1347 * Free all resources needed for 1348 * negotiation. Be paranoid about 1349 * whether there may be a timeout. 1350 */ 1351 m_freem(sp->neg->m); 1352 ng_uncallout(&sp->neg->handle, node); 1353 FREE(sp->neg, M_NETGRAPH_PPPOE); 1354 sp->neg = NULL; 1355 } else { 1356 LEAVE (ENETUNREACH); 1357 break; 1358 } 1359 } 1360 NG_FWD_NEW_DATA( error, item, sendhook, m); 1361 break; 1362 default: 1363 LEAVE(EPFNOSUPPORT); 1364 } 1365 } else { 1366 /* 1367 * Not ethernet or debug hook.. 1368 * 1369 * The packet has come in on a normal hook. 1370 * We need to find out what kind of hook, 1371 * So we can decide how to handle it. 1372 * Check the hook's state. 1373 */ 1374 sp = NG_HOOK_PRIVATE(hook); 1375 switch (sp->state) { 1376 case PPPOE_NEWCONNECTED: 1377 case PPPOE_CONNECTED: { 1378 static const u_char addrctrl[] = { 0xff, 0x03 }; 1379 struct pppoe_full_hdr *wh; 1380 1381 /* 1382 * Remove PPP address and control fields, if any. 1383 * For example, ng_ppp(4) always sends LCP packets 1384 * with address and control fields as required by 1385 * generic PPP. PPPoE is an exception to the rule. 1386 */ 1387 if (m->m_pkthdr.len >= 2) { 1388 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1389 LEAVE(ENOBUFS); 1390 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1391 m_adj(m, 2); 1392 } 1393 /* 1394 * Bang in a pre-made header, and set the length up 1395 * to be correct. Then send it to the ethernet driver. 1396 * But first correct the length. 1397 */ 1398 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1399 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1400 if (m == NULL) { 1401 LEAVE(ENOBUFS); 1402 } 1403 wh = mtod(m, struct pppoe_full_hdr *); 1404 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1405 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1406 privp->packets_out++; 1407 break; 1408 } 1409 case PPPOE_PRIMED: 1410 /* 1411 * A PADI packet is being returned by the application 1412 * that has set up this hook. This indicates that it 1413 * wants us to offer service. 1414 */ 1415 neg = sp->neg; 1416 if (m->m_len < sizeof(*wh)) { 1417 m = m_pullup(m, sizeof(*wh)); 1418 if (m == NULL) { 1419 LEAVE(ENOBUFS); 1420 } 1421 } 1422 wh = mtod(m, struct pppoe_full_hdr *); 1423 ph = &wh->ph; 1424 session = ntohs(wh->ph.sid); 1425 length = ntohs(wh->ph.length); 1426 code = wh->ph.code; 1427 /* Use peers mode in session */ 1428 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1429 if ( code != PADI_CODE) { 1430 LEAVE(EINVAL); 1431 }; 1432 ng_uncallout(&neg->handle, node); 1433 1434 /* 1435 * This is the first time we hear 1436 * from the client, so note it's 1437 * unicast address, replacing the 1438 * broadcast address. 1439 */ 1440 bcopy(wh->eh.ether_shost, 1441 neg->pkt->pkt_header.eh.ether_dhost, 1442 ETHER_ADDR_LEN); 1443 sp->state = PPPOE_SOFFER; 1444 neg->timeout = 0; 1445 neg->pkt->pkt_header.ph.code = PADO_CODE; 1446 1447 /* 1448 * start working out the tags to respond with. 1449 */ 1450 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1451 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1452 uniqtag.data.pointer = sp; 1453 init_tags(sp); 1454 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1455 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1456 insert_tag(sp, tag); /* return service */ 1457 /* 1458 * If we have a NULL service request 1459 * and have an extra service defined in this hook, 1460 * then also add a tag for the extra service. 1461 * XXX this is a hack. eventually we should be able 1462 * to support advertising many services, not just one 1463 */ 1464 if (((tag == NULL) || (tag->tag_len == 0)) 1465 && (neg->service.hdr.tag_len != 0)) { 1466 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1467 } 1468 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1469 insert_tag(sp, tag); /* returned hostunique */ 1470 insert_tag(sp, &uniqtag.hdr); 1471 scan_tags(sp, ph); 1472 make_packet(sp); 1473 sendpacket(sp); 1474 break; 1475 1476 /* 1477 * Packets coming from the hook make no sense 1478 * to sessions in these states. Throw them away. 1479 */ 1480 case PPPOE_SINIT: 1481 case PPPOE_SREQ: 1482 case PPPOE_SOFFER: 1483 case PPPOE_SNONE: 1484 case PPPOE_LISTENING: 1485 case PPPOE_DEAD: 1486 default: 1487 LEAVE(ENETUNREACH); 1488 } 1489 } 1490 quit: 1491 if (item) 1492 NG_FREE_ITEM(item); 1493 NG_FREE_M(m); 1494 return error; 1495 } 1496 1497 /* 1498 * Do local shutdown processing.. 1499 * If we are a persistant device, we might refuse to go away, and 1500 * we'd only remove our links and reset ourself. 1501 */ 1502 static int 1503 ng_pppoe_shutdown(node_p node) 1504 { 1505 const priv_p privdata = NG_NODE_PRIVATE(node); 1506 1507 DBG; 1508 NG_NODE_SET_PRIVATE(node, NULL); 1509 NG_NODE_UNREF(privdata->node); 1510 FREE(privdata, M_NETGRAPH_PPPOE); 1511 return (0); 1512 } 1513 1514 /* 1515 * Hook disconnection 1516 * 1517 * Clean up all dangling links and information about the session/hook. 1518 * For this type, removal of the last link destroys the node 1519 */ 1520 static int 1521 ng_pppoe_disconnect(hook_p hook) 1522 { 1523 node_p node = NG_HOOK_NODE(hook); 1524 priv_p privp = NG_NODE_PRIVATE(node); 1525 sessp sp; 1526 int hooks; 1527 1528 DBG; 1529 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1530 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1531 privp->debug_hook = NULL; 1532 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1533 privp->ethernet_hook = NULL; 1534 if (NG_NODE_IS_VALID(node)) 1535 ng_rmnode_self(node); 1536 } else { 1537 sp = NG_HOOK_PRIVATE(hook); 1538 if (sp->state != PPPOE_SNONE ) { 1539 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1540 } 1541 /* 1542 * According to the spec, if we are connected, 1543 * we should send a DISC packet if we are shutting down 1544 * a session. 1545 */ 1546 if ((privp->ethernet_hook) 1547 && ((sp->state == PPPOE_CONNECTED) 1548 || (sp->state == PPPOE_NEWCONNECTED))) { 1549 struct mbuf *m; 1550 struct pppoe_full_hdr *wh; 1551 struct pppoe_tag *tag; 1552 int msglen = strlen(SIGNOFF); 1553 int error = 0; 1554 1555 /* revert the stored header to DISC/PADT mode */ 1556 wh = &sp->pkt_hdr; 1557 wh->ph.code = PADT_CODE; 1558 /* Configure ethertype depending on what was used during 1559 * sessions stage. */ 1560 if (sp->pkt_hdr.eh.ether_type == 1561 ETHERTYPE_PPPOE_STUPID_SESS) 1562 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1563 else 1564 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1565 1566 /* generate a packet of that type */ 1567 MGETHDR(m, M_DONTWAIT, MT_DATA); 1568 if(m == NULL) 1569 printf("pppoe: Session out of mbufs\n"); 1570 else { 1571 m->m_pkthdr.rcvif = NULL; 1572 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1573 bcopy((caddr_t)wh, mtod(m, caddr_t), 1574 sizeof(*wh)); 1575 /* 1576 * Add a General error message and adjust 1577 * sizes 1578 */ 1579 wh = mtod(m, struct pppoe_full_hdr *); 1580 tag = wh->ph.tag; 1581 tag->tag_type = PTT_GEN_ERR; 1582 tag->tag_len = htons((u_int16_t)msglen); 1583 strncpy(tag->tag_data, SIGNOFF, msglen); 1584 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1585 msglen); 1586 wh->ph.length = htons(sizeof(*tag) + msglen); 1587 NG_SEND_DATA_ONLY(error, 1588 privp->ethernet_hook, m); 1589 } 1590 } 1591 /* 1592 * As long as we have somewhere to store the timeout handle, 1593 * we may have a timeout pending.. get rid of it. 1594 */ 1595 if (sp->neg) { 1596 ng_uncallout(&sp->neg->handle, node); 1597 if (sp->neg->m) 1598 m_freem(sp->neg->m); 1599 FREE(sp->neg, M_NETGRAPH_PPPOE); 1600 } 1601 FREE(sp, M_NETGRAPH_PPPOE); 1602 NG_HOOK_SET_PRIVATE(hook, NULL); 1603 /* work out how many session hooks there are */ 1604 /* Node goes away on last session hook removal */ 1605 if (privp->ethernet_hook) hooks -= 1; 1606 if (privp->debug_hook) hooks -= 1; 1607 } 1608 if ((NG_NODE_NUMHOOKS(node) == 0) 1609 && (NG_NODE_IS_VALID(node))) 1610 ng_rmnode_self(node); 1611 return (0); 1612 } 1613 1614 /* 1615 * timeouts come here. 1616 */ 1617 static void 1618 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 1619 { 1620 sessp sp = NG_HOOK_PRIVATE(hook); 1621 negp neg = sp->neg; 1622 int error = 0; 1623 struct mbuf *m0 = NULL; 1624 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1625 1626 DBG; 1627 switch(sp->state) { 1628 /* 1629 * resend the last packet, using an exponential backoff. 1630 * After a period of time, stop growing the backoff, 1631 * and either leave it, or revert to the start. 1632 */ 1633 case PPPOE_SINIT: 1634 case PPPOE_SREQ: 1635 /* timeouts on these produce resends */ 1636 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1637 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1638 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 1639 pppoe_ticker, NULL, 0); 1640 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1641 if (sp->state == PPPOE_SREQ) { 1642 /* revert to SINIT mode */ 1643 pppoe_start(sp); 1644 } else { 1645 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1646 } 1647 } 1648 break; 1649 case PPPOE_PRIMED: 1650 case PPPOE_SOFFER: 1651 /* a timeout on these says "give up" */ 1652 ng_rmhook_self(hook); 1653 break; 1654 default: 1655 /* timeouts have no meaning in other states */ 1656 printf("pppoe: unexpected timeout\n"); 1657 } 1658 } 1659 1660 1661 static void 1662 sendpacket(sessp sp) 1663 { 1664 struct mbuf *m0 = NULL; 1665 hook_p hook = sp->hook; 1666 node_p node = NG_HOOK_NODE(hook); 1667 priv_p privp = NG_NODE_PRIVATE(node); 1668 negp neg = sp->neg; 1669 int error = 0; 1670 1671 DBG; 1672 switch(sp->state) { 1673 case PPPOE_LISTENING: 1674 case PPPOE_DEAD: 1675 case PPPOE_SNONE: 1676 case PPPOE_CONNECTED: 1677 printf("pppoe: sendpacket: unexpected state\n"); 1678 break; 1679 1680 case PPPOE_NEWCONNECTED: 1681 /* send the PADS without a timeout - we're now connected */ 1682 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1683 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1684 break; 1685 1686 case PPPOE_PRIMED: 1687 /* No packet to send, but set up the timeout */ 1688 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1689 pppoe_ticker, NULL, 0); 1690 break; 1691 1692 case PPPOE_SOFFER: 1693 /* 1694 * send the offer but if they don't respond 1695 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1696 */ 1697 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1698 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1699 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1700 pppoe_ticker, NULL, 0); 1701 break; 1702 1703 case PPPOE_SINIT: 1704 case PPPOE_SREQ: 1705 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1706 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1707 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1708 pppoe_ticker, NULL, 0); 1709 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1710 break; 1711 1712 default: 1713 error = EINVAL; 1714 printf("pppoe: timeout: bad state\n"); 1715 } 1716 /* return (error); */ 1717 } 1718 1719 /* 1720 * Parse an incoming packet to see if any tags should be copied to the 1721 * output packet. Don't do any tags that have been handled in the main 1722 * state machine. 1723 */ 1724 static const struct pppoe_tag* 1725 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1726 { 1727 const char *const end = (const char *)next_tag(ph); 1728 const char *ptn; 1729 const struct pppoe_tag *pt = &ph->tag[0]; 1730 /* 1731 * Keep processing tags while a tag header will still fit. 1732 */ 1733 DBG; 1734 while((const char*)(pt + 1) <= end) { 1735 /* 1736 * If the tag data would go past the end of the packet, abort. 1737 */ 1738 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1739 if(ptn > end) 1740 return NULL; 1741 1742 switch (pt->tag_type) { 1743 case PTT_RELAY_SID: 1744 insert_tag(sp, pt); 1745 break; 1746 case PTT_EOL: 1747 return NULL; 1748 case PTT_SRV_NAME: 1749 case PTT_AC_NAME: 1750 case PTT_HOST_UNIQ: 1751 case PTT_AC_COOKIE: 1752 case PTT_VENDOR: 1753 case PTT_SRV_ERR: 1754 case PTT_SYS_ERR: 1755 case PTT_GEN_ERR: 1756 break; 1757 } 1758 pt = (const struct pppoe_tag*)ptn; 1759 } 1760 return NULL; 1761 } 1762 1763 static int 1764 pppoe_send_event(sessp sp, enum cmd cmdid) 1765 { 1766 int error; 1767 struct ng_mesg *msg; 1768 struct ngpppoe_sts *sts; 1769 1770 DBG; 1771 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1772 sizeof(struct ngpppoe_sts), M_NOWAIT); 1773 if (msg == NULL) 1774 return (ENOMEM); 1775 sts = (struct ngpppoe_sts *)msg->data; 1776 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1777 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1778 return (error); 1779 }
Cache object: 74dbac2f75aa29092388320783cef4d6
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