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 * $FreeBSD$ 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/sysctl.h> 56 #include <sys/syslog.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 { 154 NGM_PPPOE_COOKIE, 155 NGM_PPPOE_SETMODE, 156 "pppoe_setmode", 157 &ng_parse_string_type, 158 NULL 159 }, 160 { 161 NGM_PPPOE_COOKIE, 162 NGM_PPPOE_GETMODE, 163 "pppoe_getmode", 164 NULL, 165 &ng_parse_string_type 166 }, 167 { 0 } 168 }; 169 170 /* Netgraph node type descriptor */ 171 static struct ng_type typestruct = { 172 .version = NG_ABI_VERSION, 173 .name = NG_PPPOE_NODE_TYPE, 174 .constructor = ng_pppoe_constructor, 175 .rcvmsg = ng_pppoe_rcvmsg, 176 .shutdown = ng_pppoe_shutdown, 177 .newhook = ng_pppoe_newhook, 178 .connect = ng_pppoe_connect, 179 .rcvdata = ng_pppoe_rcvdata, 180 .disconnect = ng_pppoe_disconnect, 181 .cmdlist = ng_pppoe_cmds, 182 }; 183 NETGRAPH_INIT(pppoe, &typestruct); 184 /* Depend on ng_ether so we can use the Ethernet parse type */ 185 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1); 186 187 /* 188 * States for the session state machine. 189 * These have no meaning if there is no hook attached yet. 190 */ 191 enum state { 192 PPPOE_SNONE=0, /* [both] Initial state */ 193 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 194 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 195 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 196 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 197 PPPOE_SREQ, /* [Client] Sent a Request */ 198 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 199 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 200 PPPOE_DEAD /* [Both] */ 201 }; 202 203 #define NUMTAGS 20 /* number of tags we are set up to work with */ 204 205 /* 206 * Information we store for each hook on each node for negotiating the 207 * session. The mbuf and cluster are freed once negotiation has completed. 208 * The whole negotiation block is then discarded. 209 */ 210 211 struct sess_neg { 212 struct mbuf *m; /* holds cluster with last sent packet */ 213 union packet *pkt; /* points within the above cluster */ 214 struct callout handle; /* see timeout(9) */ 215 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 216 u_int numtags; 217 const struct pppoe_tag *tags[NUMTAGS]; 218 u_int service_len; 219 u_int ac_name_len; 220 221 struct datatag service; 222 struct datatag ac_name; 223 }; 224 typedef struct sess_neg *negp; 225 226 /* 227 * Session information that is needed after connection. 228 */ 229 struct sess_con { 230 hook_p hook; 231 u_int16_t Session_ID; 232 enum state state; 233 ng_ID_t creator; /* who to notify */ 234 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 235 negp neg; /* used when negotiating */ 236 /*struct sess_con *hash_next;*/ /* not yet used */ 237 }; 238 typedef struct sess_con *sessp; 239 240 #define NG_PPPOE_SESSION_NODE(sp) NG_HOOK_NODE(sp->hook) 241 242 enum { 243 PPPOE_STANDARD = 1, /* standard RFC2516 mode */ 244 PPPOE_NONSTANDARD, /* 3Com proprietary mode */ 245 }; 246 247 struct ng_pppoe_mode_t { 248 u_int8_t id; 249 const struct ether_header *eh_prototype; 250 const char *name; 251 }; 252 253 static const struct ether_header eh_standard = 254 {{0xff,0xff,0xff,0xff,0xff,0xff}, 255 {0x00,0x00,0x00,0x00,0x00,0x00}, 256 ETHERTYPE_PPPOE_DISC}; 257 258 static const struct ether_header eh_3Com = 259 {{0xff,0xff,0xff,0xff,0xff,0xff}, 260 {0x00,0x00,0x00,0x00,0x00,0x00}, 261 ETHERTYPE_PPPOE_STUPID_DISC}; 262 263 static const struct ng_pppoe_mode_t ng_pppoe_modes[] = { 264 { PPPOE_STANDARD, &eh_standard, NG_PPPOE_STANDARD }, 265 { PPPOE_NONSTANDARD, &eh_3Com, NG_PPPOE_NONSTANDARD }, 266 { 0, NULL}, 267 }; 268 269 /* 270 * Information we store for each node 271 */ 272 struct PPPOE { 273 node_p node; /* back pointer to node */ 274 hook_p ethernet_hook; 275 hook_p debug_hook; 276 u_int packets_in; /* packets in from ethernet */ 277 u_int packets_out; /* packets out towards ethernet */ 278 u_int32_t flags; 279 const struct ng_pppoe_mode_t *mode; /* standard PPPoE or 3Com? */ 280 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 281 }; 282 typedef struct PPPOE *priv_p; 283 284 /* Deprecated sysctl, leaved here to keep compatibility for some time */ 285 #define PPPOE_SYSCTL_KEEPSTANDARD -1 286 #define PPPOE_SYSCTL_STANDARD 0 287 #define PPPOE_SYSCTL_NONSTANDARD 1 288 static int pppoe_mode = PPPOE_SYSCTL_KEEPSTANDARD; 289 static const struct ng_pppoe_mode_t *sysctl_mode = ng_pppoe_modes; 290 291 static int 292 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 293 { 294 int error; 295 int val; 296 297 val = pppoe_mode; 298 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 299 if (error != 0 || req->newptr == NULL) 300 return (error); 301 switch (val) { 302 case PPPOE_SYSCTL_NONSTANDARD: 303 sysctl_mode = ng_pppoe_modes + 1; 304 break; 305 case PPPOE_SYSCTL_STANDARD: 306 case PPPOE_SYSCTL_KEEPSTANDARD: 307 sysctl_mode = ng_pppoe_modes; 308 break; 309 default: 310 return (EINVAL); 311 } 312 313 pppoe_mode = val; 314 printf("net.graph.nonstandard_pppoe is deprecated. See ng_pppoe(4), ppp(8).\n"); 315 return (0); 316 } 317 318 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 319 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP"); 320 321 union uniq { 322 char bytes[sizeof(void *)]; 323 void * pointer; 324 }; 325 326 #define LEAVE(x) do { error = x; goto quit; } while(0) 327 static void pppoe_start(sessp sp); 328 static void sendpacket(sessp sp); 329 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 330 static const struct pppoe_tag *scan_tags(sessp sp, 331 const struct pppoe_hdr* ph); 332 static int pppoe_send_event(sessp sp, enum cmd cmdid); 333 334 /************************************************************************* 335 * Some basic utilities from the Linux version with author's permission.* 336 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 337 ************************************************************************/ 338 339 /* 340 * Generate a new session id 341 * XXX find out the FreeBSD locking scheme. 342 */ 343 static u_int16_t 344 get_new_sid(node_p node) 345 { 346 static int pppoe_sid = 10; 347 sessp sp; 348 hook_p hook; 349 u_int16_t val; 350 priv_p privp = NG_NODE_PRIVATE(node); 351 352 DBG; 353 restart: 354 val = pppoe_sid++; 355 /* 356 * Spec says 0xFFFF is reserved. 357 * Also don't use 0x0000 358 */ 359 if (val == 0xffff) { 360 pppoe_sid = 20; 361 goto restart; 362 } 363 364 /* Check it isn't already in use */ 365 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 366 /* don't check special hooks */ 367 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 368 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 369 continue; 370 sp = NG_HOOK_PRIVATE(hook); 371 if (sp->Session_ID == val) 372 goto restart; 373 } 374 375 return val; 376 } 377 378 379 /* 380 * Return the location where the next tag can be put 381 */ 382 static __inline const struct pppoe_tag* 383 next_tag(const struct pppoe_hdr* ph) 384 { 385 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 386 + ntohs(ph->length)); 387 } 388 389 /* 390 * Look for a tag of a specific type 391 * Don't trust any length the other end says. 392 * but assume we already sanity checked ph->length. 393 */ 394 static const struct pppoe_tag* 395 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 396 { 397 const char *const end = (const char *)next_tag(ph); 398 const char *ptn; 399 const struct pppoe_tag *pt = &ph->tag[0]; 400 /* 401 * Keep processing tags while a tag header will still fit. 402 */ 403 DBG; 404 while((const char*)(pt + 1) <= end) { 405 /* 406 * If the tag data would go past the end of the packet, abort. 407 */ 408 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 409 if(ptn > end) 410 return NULL; 411 412 if(pt->tag_type == idx) 413 return pt; 414 415 pt = (const struct pppoe_tag*)ptn; 416 } 417 return NULL; 418 } 419 420 /************************************************************************** 421 * inlines to initialise or add tags to a session's tag list, 422 **************************************************************************/ 423 /* 424 * Initialise the session's tag list 425 */ 426 static void 427 init_tags(sessp sp) 428 { 429 DBG; 430 if(sp->neg == NULL) { 431 printf("pppoe: asked to init NULL neg pointer\n"); 432 return; 433 } 434 sp->neg->numtags = 0; 435 } 436 437 static void 438 insert_tag(sessp sp, const struct pppoe_tag *tp) 439 { 440 int i; 441 negp neg; 442 443 DBG; 444 if((neg = sp->neg) == NULL) { 445 printf("pppoe: asked to use NULL neg pointer\n"); 446 return; 447 } 448 if ((i = neg->numtags++) < NUMTAGS) { 449 neg->tags[i] = tp; 450 } else { 451 printf("pppoe: asked to add too many tags to packet\n"); 452 neg->numtags--; 453 } 454 } 455 456 /* 457 * Make up a packet, using the tags filled out for the session. 458 * 459 * Assume that the actual pppoe header and ethernet header 460 * are filled out externally to this routine. 461 * Also assume that neg->wh points to the correct 462 * location at the front of the buffer space. 463 */ 464 static void 465 make_packet(sessp sp) { 466 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 467 const struct pppoe_tag **tag; 468 char *dp; 469 int count; 470 int tlen; 471 u_int16_t length = 0; 472 473 DBG; 474 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 475 printf("pppoe: make_packet called from wrong state\n"); 476 } 477 dp = (char *)wh->ph.tag; 478 for (count = 0, tag = sp->neg->tags; 479 ((count < sp->neg->numtags) && (count < NUMTAGS)); 480 tag++, count++) { 481 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 482 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 483 printf("pppoe: tags too long\n"); 484 sp->neg->numtags = count; 485 break; /* XXX chop off what's too long */ 486 } 487 bcopy(*tag, (char *)dp, tlen); 488 length += tlen; 489 dp += tlen; 490 } 491 wh->ph.length = htons(length); 492 sp->neg->m->m_len = length + sizeof(*wh); 493 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 494 } 495 496 /************************************************************************** 497 * Routine to match a service offered * 498 **************************************************************************/ 499 /* 500 * Find a hook that has a service string that matches that 501 * we are seeking. for now use a simple string. 502 * In the future we may need something like regexp(). 503 * for testing allow a null string to match 1st found and a null service 504 * to match all requests. Also make '*' do the same. 505 */ 506 507 #define NG_MATCH_EXACT 1 508 #define NG_MATCH_ANY 2 509 510 static hook_p 511 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 512 { 513 sessp sp = NULL; 514 negp neg = NULL; 515 priv_p privp = NG_NODE_PRIVATE(node); 516 hook_p allhook = NULL; 517 hook_p hook; 518 519 DBG; 520 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 521 522 /* skip any hook that is debug or ethernet */ 523 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 524 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 525 continue; 526 sp = NG_HOOK_PRIVATE(hook); 527 528 /* Skip any sessions which are not in LISTEN mode. */ 529 if ( sp->state != PPPOE_LISTENING) 530 continue; 531 532 neg = sp->neg; 533 534 /* Special case for a blank or "*" service name (wildcard) */ 535 if (match == NG_MATCH_ANY && neg->service_len == 1 && 536 neg->service.data[0] == '*') { 537 allhook = hook; 538 continue; 539 } 540 541 /* If the lengths don't match, that aint it. */ 542 if (neg->service_len != svc_len) 543 continue; 544 545 /* An exact match? */ 546 if (svc_len == 0) 547 break; 548 549 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 550 break; 551 } 552 return (hook ? hook : allhook); 553 } 554 /************************************************************************** 555 * Routine to find a particular session that matches an incoming packet * 556 **************************************************************************/ 557 static hook_p 558 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 559 { 560 sessp sp = NULL; 561 hook_p hook = NULL; 562 priv_p privp = NG_NODE_PRIVATE(node); 563 u_int16_t session = ntohs(wh->ph.sid); 564 565 /* 566 * find matching peer/session combination. 567 */ 568 DBG; 569 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 570 /* don't check special hooks */ 571 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 572 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 573 continue; 574 } 575 sp = NG_HOOK_PRIVATE(hook); 576 if ( ( (sp->state == PPPOE_CONNECTED) 577 || (sp->state == PPPOE_NEWCONNECTED) ) 578 && (sp->Session_ID == session) 579 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 580 wh->eh.ether_shost, 581 ETHER_ADDR_LEN)) == 0) { 582 break; 583 } 584 } 585 return (hook); 586 } 587 588 static hook_p 589 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 590 { 591 hook_p hook = NULL; 592 priv_p privp = NG_NODE_PRIVATE(node); 593 union uniq uniq; 594 595 DBG; 596 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 597 /* cycle through all known hooks */ 598 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 599 /* don't check special hooks */ 600 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 601 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 602 continue; 603 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 604 break; 605 } 606 return (hook); 607 } 608 609 /************************************************************************** 610 * start of Netgraph entrypoints * 611 **************************************************************************/ 612 613 /* 614 * Allocate the private data structure and the generic node 615 * and link them together. 616 * 617 * ng_make_node_common() returns with a generic node struct 618 * with a single reference for us.. we transfer it to the 619 * private structure.. when we free the private struct we must 620 * unref the node so it gets freed too. 621 */ 622 static int 623 ng_pppoe_constructor(node_p node) 624 { 625 priv_p privdata; 626 627 DBG; 628 /* Initialize private descriptor */ 629 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 630 M_NOWAIT | M_ZERO); 631 if (privdata == NULL) 632 return (ENOMEM); 633 634 /* Link structs together; this counts as our one reference to *nodep */ 635 NG_NODE_SET_PRIVATE(node, privdata); 636 privdata->node = node; 637 638 /* Initialize to standard mode (the first one in ng_pppoe_modes[]). */ 639 privdata->mode = sysctl_mode; 640 641 return (0); 642 } 643 644 /* 645 * Give our ok for a hook to be added... 646 * point the hook's private info to the hook structure. 647 * 648 * The following hook names are special: 649 * Ethernet: the hook that should be connected to a NIC. 650 * debug: copies of data sent out here (when I write the code). 651 * All other hook names need only be unique. (the framework checks this). 652 */ 653 static int 654 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 655 { 656 const priv_p privp = NG_NODE_PRIVATE(node); 657 sessp sp; 658 659 DBG; 660 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 661 privp->ethernet_hook = hook; 662 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 663 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 664 privp->debug_hook = hook; 665 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 666 } else { 667 /* 668 * Any other unique name is OK. 669 * The infrastructure has already checked that it's unique, 670 * so just allocate it and hook it in. 671 */ 672 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 673 if (sp == NULL) { 674 return (ENOMEM); 675 } 676 677 NG_HOOK_SET_PRIVATE(hook, sp); 678 sp->hook = hook; 679 } 680 return(0); 681 } 682 683 /* 684 * Get a netgraph control message. 685 * Check it is one we understand. If needed, send a response. 686 * We sometimes save the address for an async action later. 687 * Always free the message. 688 */ 689 static int 690 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 691 { 692 priv_p privp = NG_NODE_PRIVATE(node); 693 struct ngpppoe_init_data *ourmsg = NULL; 694 struct ng_mesg *resp = NULL; 695 int error = 0; 696 hook_p hook = NULL; 697 sessp sp = NULL; 698 negp neg = NULL; 699 struct ng_mesg *msg; 700 701 DBG; 702 NGI_GET_MSG(item, msg); 703 /* Deal with message according to cookie and command */ 704 switch (msg->header.typecookie) { 705 case NGM_PPPOE_COOKIE: 706 switch (msg->header.cmd) { 707 case NGM_PPPOE_CONNECT: 708 case NGM_PPPOE_LISTEN: 709 case NGM_PPPOE_OFFER: 710 case NGM_PPPOE_SERVICE: 711 ourmsg = (struct ngpppoe_init_data *)msg->data; 712 if (msg->header.arglen < sizeof(*ourmsg)) { 713 printf("pppoe: init data too small\n"); 714 LEAVE(EMSGSIZE); 715 } 716 if (msg->header.arglen - sizeof(*ourmsg) > 717 PPPOE_SERVICE_NAME_SIZE) { 718 printf("pppoe_rcvmsg: service name too big"); 719 LEAVE(EMSGSIZE); 720 } 721 if (msg->header.arglen - sizeof(*ourmsg) < 722 ourmsg->data_len) { 723 printf("pppoe: init data has bad length," 724 " %d should be %zd\n", ourmsg->data_len, 725 msg->header.arglen - sizeof (*ourmsg)); 726 LEAVE(EMSGSIZE); 727 } 728 729 /* make sure strcmp will terminate safely */ 730 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 731 732 /* cycle through all known hooks */ 733 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 734 if (NG_HOOK_NAME(hook) 735 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 736 break; 737 } 738 if (hook == NULL) { 739 LEAVE(ENOENT); 740 } 741 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 742 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 743 LEAVE(EINVAL); 744 } 745 sp = NG_HOOK_PRIVATE(hook); 746 747 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 748 /* 749 * Ensure we aren't already listening for this 750 * service. 751 */ 752 if (pppoe_match_svc(node, ourmsg->data, 753 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 754 LEAVE(EEXIST); 755 } 756 } 757 758 /* 759 * PPPOE_SERVICE advertisments are set up 760 * on sessions that are in PRIMED state. 761 */ 762 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 763 break; 764 } 765 if (sp->state |= PPPOE_SNONE) { 766 printf("pppoe: Session already active\n"); 767 LEAVE(EISCONN); 768 } 769 770 /* 771 * set up prototype header 772 */ 773 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 774 M_NOWAIT | M_ZERO); 775 776 if (neg == NULL) { 777 printf("pppoe: Session out of memory\n"); 778 LEAVE(ENOMEM); 779 } 780 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 781 if(neg->m == NULL) { 782 printf("pppoe: Session out of mbufs\n"); 783 FREE(neg, M_NETGRAPH_PPPOE); 784 LEAVE(ENOBUFS); 785 } 786 neg->m->m_pkthdr.rcvif = NULL; 787 MCLGET(neg->m, M_DONTWAIT); 788 if ((neg->m->m_flags & M_EXT) == 0) { 789 printf("pppoe: Session out of mcls\n"); 790 m_freem(neg->m); 791 FREE(neg, M_NETGRAPH_PPPOE); 792 LEAVE(ENOBUFS); 793 } 794 sp->neg = neg; 795 ng_callout_init(&neg->handle); 796 neg->m->m_len = sizeof(struct pppoe_full_hdr); 797 neg->pkt = mtod(neg->m, union packet*); 798 memcpy((void *)&neg->pkt->pkt_header.eh, 799 (const void *)privp->mode->eh_prototype, 800 sizeof(struct ether_header)); 801 neg->pkt->pkt_header.ph.ver = 0x1; 802 neg->pkt->pkt_header.ph.type = 0x1; 803 neg->pkt->pkt_header.ph.sid = 0x0000; 804 neg->timeout = 0; 805 806 sp->creator = NGI_RETADDR(item); 807 } 808 switch (msg->header.cmd) { 809 case NGM_PPPOE_GET_STATUS: 810 { 811 struct ngpppoestat *stats; 812 813 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 814 if (!resp) { 815 LEAVE(ENOMEM); 816 } 817 stats = (struct ngpppoestat *) resp->data; 818 stats->packets_in = privp->packets_in; 819 stats->packets_out = privp->packets_out; 820 break; 821 } 822 case NGM_PPPOE_CONNECT: 823 /* 824 * Check the hook exists and is Uninitialised. 825 * Send a PADI request, and start the timeout logic. 826 * Store the originator of this message so we can send 827 * a success of fail message to them later. 828 * Move the session to SINIT 829 * Set up the session to the correct state and 830 * start it. 831 */ 832 neg->service.hdr.tag_type = PTT_SRV_NAME; 833 neg->service.hdr.tag_len = 834 htons((u_int16_t)ourmsg->data_len); 835 if (ourmsg->data_len) 836 bcopy(ourmsg->data, neg->service.data, 837 ourmsg->data_len); 838 neg->service_len = ourmsg->data_len; 839 pppoe_start(sp); 840 break; 841 case NGM_PPPOE_LISTEN: 842 /* 843 * Check the hook exists and is Uninitialised. 844 * Install the service matching string. 845 * Store the originator of this message so we can send 846 * a success of fail message to them later. 847 * Move the hook to 'LISTENING' 848 */ 849 neg->service.hdr.tag_type = PTT_SRV_NAME; 850 neg->service.hdr.tag_len = 851 htons((u_int16_t)ourmsg->data_len); 852 853 if (ourmsg->data_len) 854 bcopy(ourmsg->data, neg->service.data, 855 ourmsg->data_len); 856 neg->service_len = ourmsg->data_len; 857 neg->pkt->pkt_header.ph.code = PADT_CODE; 858 /* 859 * wait for PADI packet coming from ethernet 860 */ 861 sp->state = PPPOE_LISTENING; 862 break; 863 case NGM_PPPOE_OFFER: 864 /* 865 * Check the hook exists and is Uninitialised. 866 * Store the originator of this message so we can send 867 * a success of fail message to them later. 868 * Store the AC-Name given and go to PRIMED. 869 */ 870 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 871 neg->ac_name.hdr.tag_len = 872 htons((u_int16_t)ourmsg->data_len); 873 if (ourmsg->data_len) 874 bcopy(ourmsg->data, neg->ac_name.data, 875 ourmsg->data_len); 876 neg->ac_name_len = ourmsg->data_len; 877 neg->pkt->pkt_header.ph.code = PADO_CODE; 878 /* 879 * Wait for PADI packet coming from hook 880 */ 881 sp->state = PPPOE_PRIMED; 882 break; 883 case NGM_PPPOE_SERVICE: 884 /* 885 * Check the session is primed. 886 * for now just allow ONE service to be advertised. 887 * If you do it twice you just overwrite. 888 */ 889 if (sp->state != PPPOE_PRIMED) { 890 printf("pppoe: Session not primed\n"); 891 LEAVE(EISCONN); 892 } 893 neg = sp->neg; 894 neg->service.hdr.tag_type = PTT_SRV_NAME; 895 neg->service.hdr.tag_len = 896 htons((u_int16_t)ourmsg->data_len); 897 898 if (ourmsg->data_len) 899 bcopy(ourmsg->data, neg->service.data, 900 ourmsg->data_len); 901 neg->service_len = ourmsg->data_len; 902 break; 903 case NGM_PPPOE_SETMODE: 904 { 905 const struct ng_pppoe_mode_t *mode; 906 char *s; 907 size_t len; 908 909 if (msg->header.arglen == 0) 910 LEAVE(EINVAL); 911 912 s = (char *)msg->data; 913 len = msg->header.arglen - 1; 914 915 /* Search for matching mode string */ 916 for (mode = ng_pppoe_modes; mode->id != 0; mode++ ) 917 if ((strlen(mode->name) == len) && 918 !strncmp(mode->name, s, len)) 919 break; /* found */ 920 921 if (mode->id != 0) 922 privp->mode = mode; 923 else 924 LEAVE(EINVAL); 925 break; 926 } 927 case NGM_PPPOE_GETMODE: 928 NG_MKRESPONSE(resp, msg, strlen(privp->mode->name) + 1, 929 M_NOWAIT); 930 if (resp == NULL) 931 LEAVE(ENOMEM); 932 strlcpy((char *)resp->data, privp->mode->name, 933 strlen(privp->mode->name) + 1); 934 break; 935 default: 936 LEAVE(EINVAL); 937 } 938 break; 939 default: 940 LEAVE(EINVAL); 941 } 942 943 /* Take care of synchronous response, if any */ 944 quit: 945 NG_RESPOND_MSG(error, node, item, resp); 946 /* Free the message and return */ 947 NG_FREE_MSG(msg); 948 return(error); 949 } 950 951 /* 952 * Start a client into the first state. A separate function because 953 * it can be needed if the negotiation times out. 954 */ 955 static void 956 pppoe_start(sessp sp) 957 { 958 priv_p privp = NG_NODE_PRIVATE(NG_PPPOE_SESSION_NODE(sp)); 959 struct { 960 struct pppoe_tag hdr; 961 union uniq data; 962 } __packed uniqtag; 963 964 /* 965 * kick the state machine into starting up 966 */ 967 DBG; 968 sp->state = PPPOE_SINIT; 969 /* Reset the packet header to broadcast. Since we are in a client 970 * mode use configured ethertype. */ 971 memcpy((void *)&sp->neg->pkt->pkt_header.eh, 972 (const void *)privp->mode->eh_prototype, 973 sizeof(struct ether_header)); 974 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 975 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 976 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 977 uniqtag.data.pointer = sp; 978 init_tags(sp); 979 insert_tag(sp, &uniqtag.hdr); 980 insert_tag(sp, &sp->neg->service.hdr); 981 make_packet(sp); 982 sendpacket(sp); 983 } 984 985 static int 986 send_acname(sessp sp, const struct pppoe_tag *tag) 987 { 988 int error, tlen; 989 struct ng_mesg *msg; 990 struct ngpppoe_sts *sts; 991 992 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 993 sizeof(struct ngpppoe_sts), M_NOWAIT); 994 if (msg == NULL) 995 return (ENOMEM); 996 997 sts = (struct ngpppoe_sts *)msg->data; 998 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 999 strncpy(sts->hook, tag->tag_data, tlen); 1000 sts->hook[tlen] = '\0'; 1001 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1002 1003 return (error); 1004 } 1005 1006 static int 1007 send_sessionid(sessp sp) 1008 { 1009 int error; 1010 struct ng_mesg *msg; 1011 1012 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1013 sizeof(u_int16_t), M_NOWAIT); 1014 if (msg == NULL) 1015 return (ENOMEM); 1016 1017 *(u_int16_t *)msg->data = sp->Session_ID; 1018 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1019 1020 return (error); 1021 } 1022 1023 /* 1024 * Receive data, and do something with it. 1025 * The caller will never free m, so if we use up this data 1026 * or abort we must free it. 1027 */ 1028 static int 1029 ng_pppoe_rcvdata(hook_p hook, item_p item) 1030 { 1031 node_p node = NG_HOOK_NODE(hook); 1032 const priv_p privp = NG_NODE_PRIVATE(node); 1033 sessp sp = NG_HOOK_PRIVATE(hook); 1034 const struct pppoe_full_hdr *wh; 1035 const struct pppoe_hdr *ph; 1036 int error = 0; 1037 u_int16_t session; 1038 u_int16_t length; 1039 u_int8_t code; 1040 const struct pppoe_tag *utag = NULL, *tag = NULL; 1041 hook_p sendhook; 1042 struct { 1043 struct pppoe_tag hdr; 1044 union uniq data; 1045 } __packed uniqtag; 1046 negp neg = NULL; 1047 struct mbuf *m; 1048 1049 DBG; 1050 NGI_GET_M(item, m); 1051 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1052 /* 1053 * Data from the debug hook gets sent without modification 1054 * straight to the ethernet. 1055 */ 1056 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 1057 privp->packets_out++; 1058 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1059 /* 1060 * Incoming data. 1061 * Dig out various fields from the packet. 1062 * use them to decide where to send it. 1063 */ 1064 1065 privp->packets_in++; 1066 if( m->m_len < sizeof(*wh)) { 1067 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1068 if (m == NULL) { 1069 printf("couldn't m_pullup\n"); 1070 LEAVE(ENOBUFS); 1071 } 1072 } 1073 wh = mtod(m, struct pppoe_full_hdr *); 1074 length = ntohs(wh->ph.length); 1075 switch(wh->eh.ether_type) { 1076 case ETHERTYPE_PPPOE_STUPID_DISC: /* fall through */ 1077 case ETHERTYPE_PPPOE_DISC: 1078 /* 1079 * We need to try to make sure that the tag area 1080 * is contiguous, or we could wander off the end 1081 * of a buffer and make a mess. 1082 * (Linux wouldn't have this problem). 1083 */ 1084 if (m->m_pkthdr.len <= MHLEN) { 1085 if( m->m_len < m->m_pkthdr.len) { 1086 m = m_pullup(m, m->m_pkthdr.len); 1087 if (m == NULL) { 1088 printf("couldn't m_pullup\n"); 1089 LEAVE(ENOBUFS); 1090 } 1091 } 1092 } 1093 if (m->m_len != m->m_pkthdr.len) { 1094 /* 1095 * It's not all in one piece. 1096 * We need to do extra work. 1097 * Put it into a cluster. 1098 */ 1099 struct mbuf *n; 1100 n = m_dup(m, M_DONTWAIT); 1101 m_freem(m); 1102 m = n; 1103 if (m) { 1104 /* just check we got a cluster */ 1105 if (m->m_len != m->m_pkthdr.len) { 1106 m_freem(m); 1107 m = NULL; 1108 } 1109 } 1110 if (m == NULL) { 1111 printf("packet fragmented\n"); 1112 LEAVE(EMSGSIZE); 1113 } 1114 } 1115 wh = mtod(m, struct pppoe_full_hdr *); 1116 length = ntohs(wh->ph.length); 1117 ph = &wh->ph; 1118 session = ntohs(wh->ph.sid); 1119 code = wh->ph.code; 1120 1121 switch(code) { 1122 case PADI_CODE: 1123 /* 1124 * We are a server: 1125 * Look for a hook with the required service 1126 * and send the ENTIRE packet up there. 1127 * It should come back to a new hook in 1128 * PRIMED state. Look there for further 1129 * processing. 1130 */ 1131 tag = get_tag(ph, PTT_SRV_NAME); 1132 if (tag == NULL) { 1133 printf("no service tag\n"); 1134 LEAVE(ENETUNREACH); 1135 } 1136 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1137 tag->tag_data, ntohs(tag->tag_len), 1138 NG_MATCH_ANY); 1139 if (sendhook) { 1140 NG_FWD_NEW_DATA(error, item, 1141 sendhook, m); 1142 } else { 1143 LEAVE(ENETUNREACH); 1144 } 1145 break; 1146 case PADO_CODE: 1147 /* 1148 * We are a client: 1149 * Use the host_uniq tag to find the 1150 * hook this is in response to. 1151 * Received #2, now send #3 1152 * For now simply accept the first we receive. 1153 */ 1154 utag = get_tag(ph, PTT_HOST_UNIQ); 1155 if ((utag == NULL) 1156 || (ntohs(utag->tag_len) != sizeof(sp))) { 1157 printf("no host unique field\n"); 1158 LEAVE(ENETUNREACH); 1159 } 1160 1161 sendhook = pppoe_finduniq(node, utag); 1162 if (sendhook == NULL) { 1163 printf("no matching session\n"); 1164 LEAVE(ENETUNREACH); 1165 } 1166 1167 /* 1168 * Check the session is in the right state. 1169 * It needs to be in PPPOE_SINIT. 1170 */ 1171 sp = NG_HOOK_PRIVATE(sendhook); 1172 if (sp->state != PPPOE_SINIT) { 1173 printf("session in wrong state\n"); 1174 LEAVE(ENETUNREACH); 1175 } 1176 neg = sp->neg; 1177 ng_uncallout(&neg->handle, node); 1178 1179 /* 1180 * This is the first time we hear 1181 * from the server, so note it's 1182 * unicast address, replacing the 1183 * broadcast address . 1184 */ 1185 bcopy(wh->eh.ether_shost, 1186 neg->pkt->pkt_header.eh.ether_dhost, 1187 ETHER_ADDR_LEN); 1188 neg->timeout = 0; 1189 neg->pkt->pkt_header.ph.code = PADR_CODE; 1190 init_tags(sp); 1191 insert_tag(sp, utag); /* Host Unique */ 1192 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1193 insert_tag(sp, tag); /* return cookie */ 1194 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1195 insert_tag(sp, tag); /* return it */ 1196 send_acname(sp, tag); 1197 } 1198 insert_tag(sp, &neg->service.hdr); /* Service */ 1199 scan_tags(sp, ph); 1200 make_packet(sp); 1201 sp->state = PPPOE_SREQ; 1202 sendpacket(sp); 1203 break; 1204 case PADR_CODE: 1205 1206 /* 1207 * We are a server: 1208 * Use the ac_cookie tag to find the 1209 * hook this is in response to. 1210 */ 1211 utag = get_tag(ph, PTT_AC_COOKIE); 1212 if ((utag == NULL) 1213 || (ntohs(utag->tag_len) != sizeof(sp))) { 1214 LEAVE(ENETUNREACH); 1215 } 1216 1217 sendhook = pppoe_finduniq(node, utag); 1218 if (sendhook == NULL) { 1219 LEAVE(ENETUNREACH); 1220 } 1221 1222 /* 1223 * Check the session is in the right state. 1224 * It needs to be in PPPOE_SOFFER 1225 * or PPPOE_NEWCONNECTED. If the latter, 1226 * then this is a retry by the client. 1227 * so be nice, and resend. 1228 */ 1229 sp = NG_HOOK_PRIVATE(sendhook); 1230 if (sp->state == PPPOE_NEWCONNECTED) { 1231 /* 1232 * Whoa! drop back to resend that 1233 * PADS packet. 1234 * We should still have a copy of it. 1235 */ 1236 sp->state = PPPOE_SOFFER; 1237 } 1238 if (sp->state != PPPOE_SOFFER) { 1239 LEAVE (ENETUNREACH); 1240 break; 1241 } 1242 neg = sp->neg; 1243 ng_uncallout(&neg->handle, node); 1244 neg->pkt->pkt_header.ph.code = PADS_CODE; 1245 if (sp->Session_ID == 0) 1246 neg->pkt->pkt_header.ph.sid = 1247 htons(sp->Session_ID 1248 = get_new_sid(node)); 1249 send_sessionid(sp); 1250 neg->timeout = 0; 1251 /* 1252 * start working out the tags to respond with. 1253 */ 1254 init_tags(sp); 1255 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1256 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1257 insert_tag(sp, tag);/* return service */ 1258 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1259 insert_tag(sp, tag); /* return it */ 1260 insert_tag(sp, utag); /* ac_cookie */ 1261 scan_tags(sp, ph); 1262 make_packet(sp); 1263 sp->state = PPPOE_NEWCONNECTED; 1264 sendpacket(sp); 1265 /* 1266 * Having sent the last Negotiation header, 1267 * Set up the stored packet header to 1268 * be correct for the actual session. 1269 * But keep the negotialtion stuff 1270 * around in case we need to resend this last 1271 * packet. We'll discard it when we move 1272 * from NEWCONNECTED to CONNECTED 1273 */ 1274 sp->pkt_hdr = neg->pkt->pkt_header; 1275 /* Configure ethertype depending on what 1276 * ethertype was used at discovery phase */ 1277 if (sp->pkt_hdr.eh.ether_type == 1278 ETHERTYPE_PPPOE_STUPID_DISC) 1279 sp->pkt_hdr.eh.ether_type 1280 = ETHERTYPE_PPPOE_STUPID_SESS; 1281 else 1282 sp->pkt_hdr.eh.ether_type 1283 = ETHERTYPE_PPPOE_SESS; 1284 sp->pkt_hdr.ph.code = 0; 1285 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1286 break; 1287 case PADS_CODE: 1288 /* 1289 * We are a client: 1290 * Use the host_uniq tag to find the 1291 * hook this is in response to. 1292 * take the session ID and store it away. 1293 * Also make sure the pre-made header is 1294 * correct and set us into Session mode. 1295 */ 1296 utag = get_tag(ph, PTT_HOST_UNIQ); 1297 if ((utag == NULL) 1298 || (ntohs(utag->tag_len) != sizeof(sp))) { 1299 LEAVE (ENETUNREACH); 1300 break; 1301 } 1302 sendhook = pppoe_finduniq(node, utag); 1303 if (sendhook == NULL) { 1304 LEAVE(ENETUNREACH); 1305 } 1306 1307 /* 1308 * Check the session is in the right state. 1309 * It needs to be in PPPOE_SREQ. 1310 */ 1311 sp = NG_HOOK_PRIVATE(sendhook); 1312 if (sp->state != PPPOE_SREQ) { 1313 LEAVE(ENETUNREACH); 1314 } 1315 neg = sp->neg; 1316 ng_uncallout(&neg->handle, node); 1317 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1318 sp->Session_ID = ntohs(wh->ph.sid); 1319 send_sessionid(sp); 1320 neg->timeout = 0; 1321 sp->state = PPPOE_CONNECTED; 1322 /* 1323 * Now we have gone to Connected mode, 1324 * Free all resources needed for 1325 * negotiation. 1326 * Keep a copy of the header we will be using. 1327 */ 1328 sp->pkt_hdr = neg->pkt->pkt_header; 1329 if (privp->mode->id == PPPOE_NONSTANDARD) 1330 sp->pkt_hdr.eh.ether_type 1331 = ETHERTYPE_PPPOE_STUPID_SESS; 1332 else 1333 sp->pkt_hdr.eh.ether_type 1334 = ETHERTYPE_PPPOE_SESS; 1335 sp->pkt_hdr.ph.code = 0; 1336 m_freem(neg->m); 1337 FREE(sp->neg, M_NETGRAPH_PPPOE); 1338 sp->neg = NULL; 1339 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1340 break; 1341 case PADT_CODE: 1342 /* 1343 * Send a 'close' message to the controlling 1344 * process (the one that set us up); 1345 * And then tear everything down. 1346 * 1347 * Find matching peer/session combination. 1348 */ 1349 sendhook = pppoe_findsession(node, wh); 1350 if (sendhook == NULL) { 1351 LEAVE(ENETUNREACH); 1352 } 1353 /* send message to creator */ 1354 /* close hook */ 1355 if (sendhook) { 1356 ng_rmhook_self(sendhook); 1357 } 1358 break; 1359 default: 1360 LEAVE(EPFNOSUPPORT); 1361 } 1362 break; 1363 case ETHERTYPE_PPPOE_STUPID_SESS: 1364 case ETHERTYPE_PPPOE_SESS: 1365 /* 1366 * find matching peer/session combination. 1367 */ 1368 sendhook = pppoe_findsession(node, wh); 1369 if (sendhook == NULL) { 1370 LEAVE (ENETUNREACH); 1371 break; 1372 } 1373 sp = NG_HOOK_PRIVATE(sendhook); 1374 m_adj(m, sizeof(*wh)); 1375 if (m->m_pkthdr.len < length) { 1376 /* Packet too short, dump it */ 1377 LEAVE(EMSGSIZE); 1378 } 1379 1380 /* Also need to trim excess at the end */ 1381 if (m->m_pkthdr.len > length) { 1382 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1383 } 1384 if ( sp->state != PPPOE_CONNECTED) { 1385 if (sp->state == PPPOE_NEWCONNECTED) { 1386 sp->state = PPPOE_CONNECTED; 1387 /* 1388 * Now we have gone to Connected mode, 1389 * Free all resources needed for 1390 * negotiation. Be paranoid about 1391 * whether there may be a timeout. 1392 */ 1393 m_freem(sp->neg->m); 1394 ng_uncallout(&sp->neg->handle, node); 1395 FREE(sp->neg, M_NETGRAPH_PPPOE); 1396 sp->neg = NULL; 1397 } else { 1398 LEAVE (ENETUNREACH); 1399 break; 1400 } 1401 } 1402 NG_FWD_NEW_DATA( error, item, sendhook, m); 1403 break; 1404 default: 1405 LEAVE(EPFNOSUPPORT); 1406 } 1407 } else { 1408 /* 1409 * Not ethernet or debug hook.. 1410 * 1411 * The packet has come in on a normal hook. 1412 * We need to find out what kind of hook, 1413 * So we can decide how to handle it. 1414 * Check the hook's state. 1415 */ 1416 sp = NG_HOOK_PRIVATE(hook); 1417 switch (sp->state) { 1418 case PPPOE_NEWCONNECTED: 1419 case PPPOE_CONNECTED: { 1420 static const u_char addrctrl[] = { 0xff, 0x03 }; 1421 struct pppoe_full_hdr *wh; 1422 1423 /* 1424 * Remove PPP address and control fields, if any. 1425 * For example, ng_ppp(4) always sends LCP packets 1426 * with address and control fields as required by 1427 * generic PPP. PPPoE is an exception to the rule. 1428 */ 1429 if (m->m_pkthdr.len >= 2) { 1430 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1431 LEAVE(ENOBUFS); 1432 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1433 m_adj(m, 2); 1434 } 1435 /* 1436 * Bang in a pre-made header, and set the length up 1437 * to be correct. Then send it to the ethernet driver. 1438 * But first correct the length. 1439 */ 1440 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1441 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1442 if (m == NULL) { 1443 LEAVE(ENOBUFS); 1444 } 1445 wh = mtod(m, struct pppoe_full_hdr *); 1446 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1447 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1448 privp->packets_out++; 1449 break; 1450 } 1451 case PPPOE_PRIMED: 1452 /* 1453 * A PADI packet is being returned by the application 1454 * that has set up this hook. This indicates that it 1455 * wants us to offer service. 1456 */ 1457 neg = sp->neg; 1458 if (m->m_len < sizeof(*wh)) { 1459 m = m_pullup(m, sizeof(*wh)); 1460 if (m == NULL) { 1461 LEAVE(ENOBUFS); 1462 } 1463 } 1464 wh = mtod(m, struct pppoe_full_hdr *); 1465 ph = &wh->ph; 1466 session = ntohs(wh->ph.sid); 1467 length = ntohs(wh->ph.length); 1468 code = wh->ph.code; 1469 /* Use peers mode in session */ 1470 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1471 if ( code != PADI_CODE) { 1472 LEAVE(EINVAL); 1473 }; 1474 ng_uncallout(&neg->handle, node); 1475 1476 /* 1477 * This is the first time we hear 1478 * from the client, so note it's 1479 * unicast address, replacing the 1480 * broadcast address. 1481 */ 1482 bcopy(wh->eh.ether_shost, 1483 neg->pkt->pkt_header.eh.ether_dhost, 1484 ETHER_ADDR_LEN); 1485 sp->state = PPPOE_SOFFER; 1486 neg->timeout = 0; 1487 neg->pkt->pkt_header.ph.code = PADO_CODE; 1488 1489 /* 1490 * start working out the tags to respond with. 1491 */ 1492 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1493 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1494 uniqtag.data.pointer = sp; 1495 init_tags(sp); 1496 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1497 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1498 insert_tag(sp, tag); /* return service */ 1499 /* 1500 * If we have a NULL service request 1501 * and have an extra service defined in this hook, 1502 * then also add a tag for the extra service. 1503 * XXX this is a hack. eventually we should be able 1504 * to support advertising many services, not just one 1505 */ 1506 if (((tag == NULL) || (tag->tag_len == 0)) 1507 && (neg->service.hdr.tag_len != 0)) { 1508 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1509 } 1510 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1511 insert_tag(sp, tag); /* returned hostunique */ 1512 insert_tag(sp, &uniqtag.hdr); 1513 scan_tags(sp, ph); 1514 make_packet(sp); 1515 sendpacket(sp); 1516 break; 1517 1518 /* 1519 * Packets coming from the hook make no sense 1520 * to sessions in these states. Throw them away. 1521 */ 1522 case PPPOE_SINIT: 1523 case PPPOE_SREQ: 1524 case PPPOE_SOFFER: 1525 case PPPOE_SNONE: 1526 case PPPOE_LISTENING: 1527 case PPPOE_DEAD: 1528 default: 1529 LEAVE(ENETUNREACH); 1530 } 1531 } 1532 quit: 1533 if (item) 1534 NG_FREE_ITEM(item); 1535 NG_FREE_M(m); 1536 return error; 1537 } 1538 1539 /* 1540 * Do local shutdown processing.. 1541 * If we are a persistant device, we might refuse to go away, and 1542 * we'd only remove our links and reset ourself. 1543 */ 1544 static int 1545 ng_pppoe_shutdown(node_p node) 1546 { 1547 const priv_p privdata = NG_NODE_PRIVATE(node); 1548 1549 DBG; 1550 NG_NODE_SET_PRIVATE(node, NULL); 1551 NG_NODE_UNREF(privdata->node); 1552 FREE(privdata, M_NETGRAPH_PPPOE); 1553 return (0); 1554 } 1555 1556 /* 1557 * This is called once we've already connected a new hook to the other node. 1558 * It gives us a chance to balk at the last minute. 1559 */ 1560 static int 1561 ng_pppoe_connect(hook_p hook) 1562 { 1563 /* be really amiable and just say "YUP that's OK by me! " */ 1564 return (0); 1565 } 1566 1567 /* 1568 * Hook disconnection 1569 * 1570 * Clean up all dangling links and information about the session/hook. 1571 * For this type, removal of the last link destroys the node 1572 */ 1573 static int 1574 ng_pppoe_disconnect(hook_p hook) 1575 { 1576 node_p node = NG_HOOK_NODE(hook); 1577 priv_p privp = NG_NODE_PRIVATE(node); 1578 sessp sp; 1579 int hooks; 1580 1581 DBG; 1582 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1583 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1584 privp->debug_hook = NULL; 1585 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1586 privp->ethernet_hook = NULL; 1587 if (NG_NODE_IS_VALID(node)) 1588 ng_rmnode_self(node); 1589 } else { 1590 sp = NG_HOOK_PRIVATE(hook); 1591 if (sp->state != PPPOE_SNONE ) { 1592 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1593 } 1594 /* 1595 * According to the spec, if we are connected, 1596 * we should send a DISC packet if we are shutting down 1597 * a session. 1598 */ 1599 if ((privp->ethernet_hook) 1600 && ((sp->state == PPPOE_CONNECTED) 1601 || (sp->state == PPPOE_NEWCONNECTED))) { 1602 struct mbuf *m; 1603 struct pppoe_full_hdr *wh; 1604 struct pppoe_tag *tag; 1605 int msglen = strlen(SIGNOFF); 1606 int error = 0; 1607 1608 /* revert the stored header to DISC/PADT mode */ 1609 wh = &sp->pkt_hdr; 1610 wh->ph.code = PADT_CODE; 1611 /* Configure ethertype depending on what was used during 1612 * sessions stage. */ 1613 if (sp->pkt_hdr.eh.ether_type == 1614 ETHERTYPE_PPPOE_STUPID_SESS) 1615 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1616 else 1617 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1618 1619 /* generate a packet of that type */ 1620 MGETHDR(m, M_DONTWAIT, MT_DATA); 1621 if(m == NULL) 1622 printf("pppoe: Session out of mbufs\n"); 1623 else { 1624 m->m_pkthdr.rcvif = NULL; 1625 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1626 bcopy((caddr_t)wh, mtod(m, caddr_t), 1627 sizeof(*wh)); 1628 /* 1629 * Add a General error message and adjust 1630 * sizes 1631 */ 1632 wh = mtod(m, struct pppoe_full_hdr *); 1633 tag = wh->ph.tag; 1634 tag->tag_type = PTT_GEN_ERR; 1635 tag->tag_len = htons((u_int16_t)msglen); 1636 strncpy(tag->tag_data, SIGNOFF, msglen); 1637 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1638 msglen); 1639 wh->ph.length = htons(sizeof(*tag) + msglen); 1640 NG_SEND_DATA_ONLY(error, 1641 privp->ethernet_hook, m); 1642 } 1643 } 1644 /* 1645 * As long as we have somewhere to store the timeout handle, 1646 * we may have a timeout pending.. get rid of it. 1647 */ 1648 if (sp->neg) { 1649 ng_uncallout(&sp->neg->handle, node); 1650 if (sp->neg->m) 1651 m_freem(sp->neg->m); 1652 FREE(sp->neg, M_NETGRAPH_PPPOE); 1653 } 1654 FREE(sp, M_NETGRAPH_PPPOE); 1655 NG_HOOK_SET_PRIVATE(hook, NULL); 1656 /* work out how many session hooks there are */ 1657 /* Node goes away on last session hook removal */ 1658 if (privp->ethernet_hook) hooks -= 1; 1659 if (privp->debug_hook) hooks -= 1; 1660 } 1661 if ((NG_NODE_NUMHOOKS(node) == 0) 1662 && (NG_NODE_IS_VALID(node))) 1663 ng_rmnode_self(node); 1664 return (0); 1665 } 1666 1667 /* 1668 * timeouts come here. 1669 */ 1670 static void 1671 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 1672 { 1673 sessp sp = NG_HOOK_PRIVATE(hook); 1674 negp neg = sp->neg; 1675 int error = 0; 1676 struct mbuf *m0 = NULL; 1677 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1678 1679 DBG; 1680 switch(sp->state) { 1681 /* 1682 * resend the last packet, using an exponential backoff. 1683 * After a period of time, stop growing the backoff, 1684 * and either leave it, or revert to the start. 1685 */ 1686 case PPPOE_SINIT: 1687 case PPPOE_SREQ: 1688 /* timeouts on these produce resends */ 1689 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1690 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1691 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 1692 pppoe_ticker, NULL, 0); 1693 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1694 if (sp->state == PPPOE_SREQ) { 1695 /* revert to SINIT mode */ 1696 pppoe_start(sp); 1697 } else { 1698 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1699 } 1700 } 1701 break; 1702 case PPPOE_PRIMED: 1703 case PPPOE_SOFFER: 1704 /* a timeout on these says "give up" */ 1705 ng_rmhook_self(hook); 1706 break; 1707 default: 1708 /* timeouts have no meaning in other states */ 1709 printf("pppoe: unexpected timeout\n"); 1710 } 1711 } 1712 1713 1714 static void 1715 sendpacket(sessp sp) 1716 { 1717 struct mbuf *m0 = NULL; 1718 hook_p hook = sp->hook; 1719 node_p node = NG_HOOK_NODE(hook); 1720 priv_p privp = NG_NODE_PRIVATE(node); 1721 negp neg = sp->neg; 1722 int error = 0; 1723 1724 DBG; 1725 switch(sp->state) { 1726 case PPPOE_LISTENING: 1727 case PPPOE_DEAD: 1728 case PPPOE_SNONE: 1729 case PPPOE_CONNECTED: 1730 printf("pppoe: sendpacket: unexpected state\n"); 1731 break; 1732 1733 case PPPOE_NEWCONNECTED: 1734 /* send the PADS without a timeout - we're now connected */ 1735 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1736 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1737 break; 1738 1739 case PPPOE_PRIMED: 1740 /* No packet to send, but set up the timeout */ 1741 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1742 pppoe_ticker, NULL, 0); 1743 break; 1744 1745 case PPPOE_SOFFER: 1746 /* 1747 * send the offer but if they don't respond 1748 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1749 */ 1750 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1751 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1752 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1753 pppoe_ticker, NULL, 0); 1754 break; 1755 1756 case PPPOE_SINIT: 1757 case PPPOE_SREQ: 1758 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1759 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1760 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1761 pppoe_ticker, NULL, 0); 1762 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1763 break; 1764 1765 default: 1766 error = EINVAL; 1767 printf("pppoe: timeout: bad state\n"); 1768 } 1769 /* return (error); */ 1770 } 1771 1772 /* 1773 * Parse an incoming packet to see if any tags should be copied to the 1774 * output packet. Don't do any tags that have been handled in the main 1775 * state machine. 1776 */ 1777 static const struct pppoe_tag* 1778 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1779 { 1780 const char *const end = (const char *)next_tag(ph); 1781 const char *ptn; 1782 const struct pppoe_tag *pt = &ph->tag[0]; 1783 /* 1784 * Keep processing tags while a tag header will still fit. 1785 */ 1786 DBG; 1787 while((const char*)(pt + 1) <= end) { 1788 /* 1789 * If the tag data would go past the end of the packet, abort. 1790 */ 1791 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1792 if(ptn > end) 1793 return NULL; 1794 1795 switch (pt->tag_type) { 1796 case PTT_RELAY_SID: 1797 insert_tag(sp, pt); 1798 break; 1799 case PTT_EOL: 1800 return NULL; 1801 case PTT_SRV_NAME: 1802 case PTT_AC_NAME: 1803 case PTT_HOST_UNIQ: 1804 case PTT_AC_COOKIE: 1805 case PTT_VENDOR: 1806 case PTT_SRV_ERR: 1807 case PTT_SYS_ERR: 1808 case PTT_GEN_ERR: 1809 break; 1810 } 1811 pt = (const struct pppoe_tag*)ptn; 1812 } 1813 return NULL; 1814 } 1815 1816 static int 1817 pppoe_send_event(sessp sp, enum cmd cmdid) 1818 { 1819 int error; 1820 struct ng_mesg *msg; 1821 struct ngpppoe_sts *sts; 1822 1823 DBG; 1824 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1825 sizeof(struct ngpppoe_sts), M_NOWAIT); 1826 if (msg == NULL) 1827 return (ENOMEM); 1828 sts = (struct ngpppoe_sts *)msg->data; 1829 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1830 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1831 return (error); 1832 } 1833