1 2 /* 3 * ng_pppoe.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD$ 40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41 */ 42 #if 0 43 #define DBG do { printf("ng_device: %s\n", __func__ ); } while (0) 44 #else 45 #define DBG do {} while (0) 46 #endif 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/mbuf.h> 52 #include <sys/malloc.h> 53 #include <sys/errno.h> 54 #include <sys/sysctl.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_connect_t ng_pppoe_connect; 82 static ng_rcvdata_t ng_pppoe_rcvdata; 83 static ng_disconnect_t ng_pppoe_disconnect; 84 85 /* Parse type for struct ngpppoe_init_data */ 86 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 87 = NG_PPPOE_INIT_DATA_TYPE_INFO; 88 static const struct ng_parse_type ngpppoe_init_data_state_type = { 89 &ng_parse_struct_type, 90 &ngpppoe_init_data_type_fields 91 }; 92 93 /* Parse type for struct ngpppoe_sts */ 94 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 95 = NG_PPPOE_STS_TYPE_INFO; 96 static const struct ng_parse_type ng_pppoe_sts_state_type = { 97 &ng_parse_struct_type, 98 &ng_pppoe_sts_type_fields 99 }; 100 101 /* List of commands and how to convert arguments to/from ASCII */ 102 static const struct ng_cmdlist ng_pppoe_cmds[] = { 103 { 104 NGM_PPPOE_COOKIE, 105 NGM_PPPOE_CONNECT, 106 "pppoe_connect", 107 &ngpppoe_init_data_state_type, 108 NULL 109 }, 110 { 111 NGM_PPPOE_COOKIE, 112 NGM_PPPOE_LISTEN, 113 "pppoe_listen", 114 &ngpppoe_init_data_state_type, 115 NULL 116 }, 117 { 118 NGM_PPPOE_COOKIE, 119 NGM_PPPOE_OFFER, 120 "pppoe_offer", 121 &ngpppoe_init_data_state_type, 122 NULL 123 }, 124 { 125 NGM_PPPOE_COOKIE, 126 NGM_PPPOE_SERVICE, 127 "pppoe_service", 128 &ngpppoe_init_data_state_type, 129 NULL 130 }, 131 { 132 NGM_PPPOE_COOKIE, 133 NGM_PPPOE_SUCCESS, 134 "pppoe_success", 135 &ng_pppoe_sts_state_type, 136 NULL 137 }, 138 { 139 NGM_PPPOE_COOKIE, 140 NGM_PPPOE_FAIL, 141 "pppoe_fail", 142 &ng_pppoe_sts_state_type, 143 NULL 144 }, 145 { 146 NGM_PPPOE_COOKIE, 147 NGM_PPPOE_CLOSE, 148 "pppoe_close", 149 &ng_pppoe_sts_state_type, 150 NULL 151 }, 152 { 153 NGM_PPPOE_COOKIE, 154 NGM_PPPOE_SETMODE, 155 "pppoe_setmode", 156 &ng_parse_string_type, 157 NULL 158 }, 159 { 160 NGM_PPPOE_COOKIE, 161 NGM_PPPOE_GETMODE, 162 "pppoe_getmode", 163 NULL, 164 &ng_parse_string_type 165 }, 166 { 0 } 167 }; 168 169 /* Netgraph node type descriptor */ 170 static struct ng_type typestruct = { 171 .version = NG_ABI_VERSION, 172 .name = NG_PPPOE_NODE_TYPE, 173 .constructor = ng_pppoe_constructor, 174 .rcvmsg = ng_pppoe_rcvmsg, 175 .shutdown = ng_pppoe_shutdown, 176 .newhook = ng_pppoe_newhook, 177 .connect = ng_pppoe_connect, 178 .rcvdata = ng_pppoe_rcvdata, 179 .disconnect = ng_pppoe_disconnect, 180 .cmdlist = ng_pppoe_cmds, 181 }; 182 NETGRAPH_INIT(pppoe, &typestruct); 183 /* Depend on ng_ether so we can use the Ethernet parse type */ 184 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1); 185 186 /* 187 * States for the session state machine. 188 * These have no meaning if there is no hook attached yet. 189 */ 190 enum state { 191 PPPOE_SNONE=0, /* [both] Initial state */ 192 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 193 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 194 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 195 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 196 PPPOE_SREQ, /* [Client] Sent a Request */ 197 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 198 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 199 PPPOE_DEAD /* [Both] */ 200 }; 201 202 #define NUMTAGS 20 /* number of tags we are set up to work with */ 203 204 /* 205 * Information we store for each hook on each node for negotiating the 206 * session. The mbuf and cluster are freed once negotiation has completed. 207 * The whole negotiation block is then discarded. 208 */ 209 210 struct sess_neg { 211 struct mbuf *m; /* holds cluster with last sent packet */ 212 union packet *pkt; /* points within the above cluster */ 213 struct callout handle; /* see timeout(9) */ 214 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 215 u_int numtags; 216 const struct pppoe_tag *tags[NUMTAGS]; 217 u_int service_len; 218 u_int ac_name_len; 219 220 struct datatag service; 221 struct datatag ac_name; 222 }; 223 typedef struct sess_neg *negp; 224 225 /* 226 * Session information that is needed after connection. 227 */ 228 struct sess_con { 229 hook_p hook; 230 u_int16_t Session_ID; 231 enum state state; 232 ng_ID_t creator; /* who to notify */ 233 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 234 negp neg; /* used when negotiating */ 235 /*struct sess_con *hash_next;*/ /* not yet used */ 236 }; 237 typedef struct sess_con *sessp; 238 239 #define NG_PPPOE_SESSION_NODE(sp) NG_HOOK_NODE(sp->hook) 240 241 enum { 242 PPPOE_STANDARD = 1, /* standard RFC2516 mode */ 243 PPPOE_NONSTANDARD, /* 3Com proprietary mode */ 244 }; 245 246 struct ng_pppoe_mode_t { 247 u_int8_t id; 248 const struct ether_header *eh_prototype; 249 const char *name; 250 }; 251 252 static const struct ether_header eh_standard = 253 {{0xff,0xff,0xff,0xff,0xff,0xff}, 254 {0x00,0x00,0x00,0x00,0x00,0x00}, 255 ETHERTYPE_PPPOE_DISC}; 256 257 static const struct ether_header eh_3Com = 258 {{0xff,0xff,0xff,0xff,0xff,0xff}, 259 {0x00,0x00,0x00,0x00,0x00,0x00}, 260 ETHERTYPE_PPPOE_STUPID_DISC}; 261 262 static const struct ng_pppoe_mode_t ng_pppoe_modes[] = { 263 { PPPOE_STANDARD, &eh_standard, NG_PPPOE_STANDARD }, 264 { PPPOE_NONSTANDARD, &eh_3Com, NG_PPPOE_NONSTANDARD }, 265 { 0, NULL}, 266 }; 267 268 /* 269 * Information we store for each node 270 */ 271 struct PPPOE { 272 node_p node; /* back pointer to node */ 273 hook_p ethernet_hook; 274 hook_p debug_hook; 275 u_int packets_in; /* packets in from ethernet */ 276 u_int packets_out; /* packets out towards ethernet */ 277 u_int32_t flags; 278 const struct ng_pppoe_mode_t *mode; /* standard PPPoE or 3Com? */ 279 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 280 }; 281 typedef struct PPPOE *priv_p; 282 283 /* Deprecated sysctl, leaved here to keep compatibility for some time */ 284 #define PPPOE_SYSCTL_KEEPSTANDARD -1 285 #define PPPOE_SYSCTL_STANDARD 0 286 #define PPPOE_SYSCTL_NONSTANDARD 1 287 static int pppoe_mode = PPPOE_SYSCTL_KEEPSTANDARD; 288 static const struct ng_pppoe_mode_t *sysctl_mode = ng_pppoe_modes; 289 290 static int 291 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 292 { 293 int error; 294 int val; 295 296 val = pppoe_mode; 297 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 298 if (error != 0 || req->newptr == NULL) 299 return (error); 300 switch (val) { 301 case PPPOE_SYSCTL_NONSTANDARD: 302 sysctl_mode = ng_pppoe_modes + 1; 303 break; 304 case PPPOE_SYSCTL_STANDARD: 305 case PPPOE_SYSCTL_KEEPSTANDARD: 306 sysctl_mode = ng_pppoe_modes; 307 break; 308 default: 309 return (EINVAL); 310 } 311 312 pppoe_mode = val; 313 printf("net.graph.nonstandard_pppoe is deprecated. See ng_pppoe(4), ppp(8).\n"); 314 return (0); 315 } 316 317 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 318 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP"); 319 320 union uniq { 321 char bytes[sizeof(void *)]; 322 void * pointer; 323 }; 324 325 #define LEAVE(x) do { error = x; goto quit; } while(0) 326 static void pppoe_start(sessp sp); 327 static void sendpacket(sessp sp); 328 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 329 static const struct pppoe_tag *scan_tags(sessp sp, 330 const struct pppoe_hdr* ph); 331 static int pppoe_send_event(sessp sp, enum cmd cmdid); 332 333 /************************************************************************* 334 * Some basic utilities from the Linux version with author's permission.* 335 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 336 ************************************************************************/ 337 338 /* 339 * Generate a new session id 340 * XXX find out the FreeBSD locking scheme. 341 */ 342 static u_int16_t 343 get_new_sid(node_p node) 344 { 345 static int pppoe_sid = 10; 346 sessp sp; 347 hook_p hook; 348 u_int16_t val; 349 priv_p privp = NG_NODE_PRIVATE(node); 350 351 DBG; 352 restart: 353 val = pppoe_sid++; 354 /* 355 * Spec says 0xFFFF is reserved. 356 * Also don't use 0x0000 357 */ 358 if (val == 0xffff) { 359 pppoe_sid = 20; 360 goto restart; 361 } 362 363 /* Check it isn't already in use */ 364 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 365 /* don't check special hooks */ 366 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 367 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 368 continue; 369 sp = NG_HOOK_PRIVATE(hook); 370 if (sp->Session_ID == val) 371 goto restart; 372 } 373 374 return val; 375 } 376 377 378 /* 379 * Return the location where the next tag can be put 380 */ 381 static __inline const struct pppoe_tag* 382 next_tag(const struct pppoe_hdr* ph) 383 { 384 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 385 + ntohs(ph->length)); 386 } 387 388 /* 389 * Look for a tag of a specific type 390 * Don't trust any length the other end says. 391 * but assume we already sanity checked ph->length. 392 */ 393 static const struct pppoe_tag* 394 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 395 { 396 const char *const end = (const char *)next_tag(ph); 397 const char *ptn; 398 const struct pppoe_tag *pt = &ph->tag[0]; 399 /* 400 * Keep processing tags while a tag header will still fit. 401 */ 402 DBG; 403 while((const char*)(pt + 1) <= end) { 404 /* 405 * If the tag data would go past the end of the packet, abort. 406 */ 407 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 408 if(ptn > end) 409 return NULL; 410 411 if(pt->tag_type == idx) 412 return pt; 413 414 pt = (const struct pppoe_tag*)ptn; 415 } 416 return NULL; 417 } 418 419 /************************************************************************** 420 * inlines to initialise or add tags to a session's tag list, 421 **************************************************************************/ 422 /* 423 * Initialise the session's tag list 424 */ 425 static void 426 init_tags(sessp sp) 427 { 428 DBG; 429 if(sp->neg == NULL) { 430 printf("pppoe: asked to init NULL neg pointer\n"); 431 return; 432 } 433 sp->neg->numtags = 0; 434 } 435 436 static void 437 insert_tag(sessp sp, const struct pppoe_tag *tp) 438 { 439 int i; 440 negp neg; 441 442 DBG; 443 if((neg = sp->neg) == NULL) { 444 printf("pppoe: asked to use NULL neg pointer\n"); 445 return; 446 } 447 if ((i = neg->numtags++) < NUMTAGS) { 448 neg->tags[i] = tp; 449 } else { 450 printf("pppoe: asked to add too many tags to packet\n"); 451 neg->numtags--; 452 } 453 } 454 455 /* 456 * Make up a packet, using the tags filled out for the session. 457 * 458 * Assume that the actual pppoe header and ethernet header 459 * are filled out externally to this routine. 460 * Also assume that neg->wh points to the correct 461 * location at the front of the buffer space. 462 */ 463 static void 464 make_packet(sessp sp) { 465 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 466 const struct pppoe_tag **tag; 467 char *dp; 468 int count; 469 int tlen; 470 u_int16_t length = 0; 471 472 DBG; 473 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 474 printf("pppoe: make_packet called from wrong state\n"); 475 } 476 dp = (char *)wh->ph.tag; 477 for (count = 0, tag = sp->neg->tags; 478 ((count < sp->neg->numtags) && (count < NUMTAGS)); 479 tag++, count++) { 480 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 481 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 482 printf("pppoe: tags too long\n"); 483 sp->neg->numtags = count; 484 break; /* XXX chop off what's too long */ 485 } 486 bcopy(*tag, (char *)dp, tlen); 487 length += tlen; 488 dp += tlen; 489 } 490 wh->ph.length = htons(length); 491 sp->neg->m->m_len = length + sizeof(*wh); 492 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 493 } 494 495 /************************************************************************** 496 * Routine to match a service offered * 497 **************************************************************************/ 498 /* 499 * Find a hook that has a service string that matches that 500 * we are seeking. for now use a simple string. 501 * In the future we may need something like regexp(). 502 * for testing allow a null string to match 1st found and a null service 503 * to match all requests. Also make '*' do the same. 504 */ 505 506 #define NG_MATCH_EXACT 1 507 #define NG_MATCH_ANY 2 508 509 static hook_p 510 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 511 { 512 sessp sp = NULL; 513 negp neg = NULL; 514 priv_p privp = NG_NODE_PRIVATE(node); 515 hook_p allhook = NULL; 516 hook_p hook; 517 518 DBG; 519 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 520 521 /* skip any hook that is debug or ethernet */ 522 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 523 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 524 continue; 525 sp = NG_HOOK_PRIVATE(hook); 526 527 /* Skip any sessions which are not in LISTEN mode. */ 528 if ( sp->state != PPPOE_LISTENING) 529 continue; 530 531 neg = sp->neg; 532 533 /* Special case for a blank or "*" service name (wildcard) */ 534 if (match == NG_MATCH_ANY && neg->service_len == 1 && 535 neg->service.data[0] == '*') { 536 allhook = hook; 537 continue; 538 } 539 540 /* If the lengths don't match, that aint it. */ 541 if (neg->service_len != svc_len) 542 continue; 543 544 /* An exact match? */ 545 if (svc_len == 0) 546 break; 547 548 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 549 break; 550 } 551 return (hook ? hook : allhook); 552 } 553 /************************************************************************** 554 * Routine to find a particular session that matches an incoming packet * 555 **************************************************************************/ 556 static hook_p 557 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 558 { 559 sessp sp = NULL; 560 hook_p hook = NULL; 561 priv_p privp = NG_NODE_PRIVATE(node); 562 u_int16_t session = ntohs(wh->ph.sid); 563 564 /* 565 * find matching peer/session combination. 566 */ 567 DBG; 568 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 569 /* don't check special hooks */ 570 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 571 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 572 continue; 573 } 574 sp = NG_HOOK_PRIVATE(hook); 575 if ( ( (sp->state == PPPOE_CONNECTED) 576 || (sp->state == PPPOE_NEWCONNECTED) ) 577 && (sp->Session_ID == session) 578 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 579 wh->eh.ether_shost, 580 ETHER_ADDR_LEN)) == 0) { 581 break; 582 } 583 } 584 return (hook); 585 } 586 587 static hook_p 588 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 589 { 590 hook_p hook = NULL; 591 priv_p privp = NG_NODE_PRIVATE(node); 592 union uniq uniq; 593 594 DBG; 595 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 596 /* cycle through all known hooks */ 597 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 598 /* don't check special hooks */ 599 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 600 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 601 continue; 602 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 603 break; 604 } 605 return (hook); 606 } 607 608 /************************************************************************** 609 * start of Netgraph entrypoints * 610 **************************************************************************/ 611 612 /* 613 * Allocate the private data structure and the generic node 614 * and link them together. 615 * 616 * ng_make_node_common() returns with a generic node struct 617 * with a single reference for us.. we transfer it to the 618 * private structure.. when we free the private struct we must 619 * unref the node so it gets freed too. 620 */ 621 static int 622 ng_pppoe_constructor(node_p node) 623 { 624 priv_p privdata; 625 626 DBG; 627 /* Initialize private descriptor */ 628 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 629 M_NOWAIT | M_ZERO); 630 if (privdata == NULL) 631 return (ENOMEM); 632 633 /* Link structs together; this counts as our one reference to *nodep */ 634 NG_NODE_SET_PRIVATE(node, privdata); 635 privdata->node = node; 636 637 /* Initialize to standard mode (the first one in ng_pppoe_modes[]). */ 638 privdata->mode = sysctl_mode; 639 640 return (0); 641 } 642 643 /* 644 * Give our ok for a hook to be added... 645 * point the hook's private info to the hook structure. 646 * 647 * The following hook names are special: 648 * Ethernet: the hook that should be connected to a NIC. 649 * debug: copies of data sent out here (when I write the code). 650 * All other hook names need only be unique. (the framework checks this). 651 */ 652 static int 653 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 654 { 655 const priv_p privp = NG_NODE_PRIVATE(node); 656 sessp sp; 657 658 DBG; 659 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 660 privp->ethernet_hook = hook; 661 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 662 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 663 privp->debug_hook = hook; 664 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 665 } else { 666 /* 667 * Any other unique name is OK. 668 * The infrastructure has already checked that it's unique, 669 * so just allocate it and hook it in. 670 */ 671 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 672 if (sp == NULL) { 673 return (ENOMEM); 674 } 675 676 NG_HOOK_SET_PRIVATE(hook, sp); 677 sp->hook = hook; 678 } 679 return(0); 680 } 681 682 /* 683 * Get a netgraph control message. 684 * Check it is one we understand. If needed, send a response. 685 * We sometimes save the address for an async action later. 686 * Always free the message. 687 */ 688 static int 689 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 690 { 691 priv_p privp = NG_NODE_PRIVATE(node); 692 struct ngpppoe_init_data *ourmsg = NULL; 693 struct ng_mesg *resp = NULL; 694 int error = 0; 695 hook_p hook = NULL; 696 sessp sp = NULL; 697 negp neg = NULL; 698 struct ng_mesg *msg; 699 700 DBG; 701 NGI_GET_MSG(item, msg); 702 /* Deal with message according to cookie and command */ 703 switch (msg->header.typecookie) { 704 case NGM_PPPOE_COOKIE: 705 switch (msg->header.cmd) { 706 case NGM_PPPOE_CONNECT: 707 case NGM_PPPOE_LISTEN: 708 case NGM_PPPOE_OFFER: 709 case NGM_PPPOE_SERVICE: 710 ourmsg = (struct ngpppoe_init_data *)msg->data; 711 if (msg->header.arglen < sizeof(*ourmsg)) { 712 printf("pppoe: init data too small\n"); 713 LEAVE(EMSGSIZE); 714 } 715 if (msg->header.arglen - sizeof(*ourmsg) > 716 PPPOE_SERVICE_NAME_SIZE) { 717 printf("pppoe_rcvmsg: service name too big"); 718 LEAVE(EMSGSIZE); 719 } 720 if (msg->header.arglen - sizeof(*ourmsg) < 721 ourmsg->data_len) { 722 printf("pppoe: init data has bad length," 723 " %d should be %zd\n", ourmsg->data_len, 724 msg->header.arglen - sizeof (*ourmsg)); 725 LEAVE(EMSGSIZE); 726 } 727 728 /* make sure strcmp will terminate safely */ 729 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 730 731 /* cycle through all known hooks */ 732 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 733 if (NG_HOOK_NAME(hook) 734 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 735 break; 736 } 737 if (hook == NULL) { 738 LEAVE(ENOENT); 739 } 740 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 741 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 742 LEAVE(EINVAL); 743 } 744 sp = NG_HOOK_PRIVATE(hook); 745 746 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 747 /* 748 * Ensure we aren't already listening for this 749 * service. 750 */ 751 if (pppoe_match_svc(node, ourmsg->data, 752 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 753 LEAVE(EEXIST); 754 } 755 } 756 757 /* 758 * PPPOE_SERVICE advertisments are set up 759 * on sessions that are in PRIMED state. 760 */ 761 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 762 break; 763 } 764 if (sp->state |= PPPOE_SNONE) { 765 printf("pppoe: Session already active\n"); 766 LEAVE(EISCONN); 767 } 768 769 /* 770 * set up prototype header 771 */ 772 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 773 M_NOWAIT | M_ZERO); 774 775 if (neg == NULL) { 776 printf("pppoe: Session out of memory\n"); 777 LEAVE(ENOMEM); 778 } 779 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 780 if(neg->m == NULL) { 781 printf("pppoe: Session out of mbufs\n"); 782 FREE(neg, M_NETGRAPH_PPPOE); 783 LEAVE(ENOBUFS); 784 } 785 neg->m->m_pkthdr.rcvif = NULL; 786 MCLGET(neg->m, M_DONTWAIT); 787 if ((neg->m->m_flags & M_EXT) == 0) { 788 printf("pppoe: Session out of mcls\n"); 789 m_freem(neg->m); 790 FREE(neg, M_NETGRAPH_PPPOE); 791 LEAVE(ENOBUFS); 792 } 793 sp->neg = neg; 794 ng_callout_init(&neg->handle); 795 neg->m->m_len = sizeof(struct pppoe_full_hdr); 796 neg->pkt = mtod(neg->m, union packet*); 797 memcpy((void *)&neg->pkt->pkt_header.eh, 798 (const void *)privp->mode->eh_prototype, 799 sizeof(struct ether_header)); 800 neg->pkt->pkt_header.ph.ver = 0x1; 801 neg->pkt->pkt_header.ph.type = 0x1; 802 neg->pkt->pkt_header.ph.sid = 0x0000; 803 neg->timeout = 0; 804 805 sp->creator = NGI_RETADDR(item); 806 } 807 switch (msg->header.cmd) { 808 case NGM_PPPOE_GET_STATUS: 809 { 810 struct ngpppoestat *stats; 811 812 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 813 if (!resp) { 814 LEAVE(ENOMEM); 815 } 816 stats = (struct ngpppoestat *) resp->data; 817 stats->packets_in = privp->packets_in; 818 stats->packets_out = privp->packets_out; 819 break; 820 } 821 case NGM_PPPOE_CONNECT: 822 /* 823 * Check the hook exists and is Uninitialised. 824 * Send a PADI request, and start the timeout logic. 825 * Store the originator of this message so we can send 826 * a success of fail message to them later. 827 * Move the session to SINIT 828 * Set up the session to the correct state and 829 * start it. 830 */ 831 neg->service.hdr.tag_type = PTT_SRV_NAME; 832 neg->service.hdr.tag_len = 833 htons((u_int16_t)ourmsg->data_len); 834 if (ourmsg->data_len) 835 bcopy(ourmsg->data, neg->service.data, 836 ourmsg->data_len); 837 neg->service_len = ourmsg->data_len; 838 pppoe_start(sp); 839 break; 840 case NGM_PPPOE_LISTEN: 841 /* 842 * Check the hook exists and is Uninitialised. 843 * Install the service matching string. 844 * Store the originator of this message so we can send 845 * a success of fail message to them later. 846 * Move the hook to 'LISTENING' 847 */ 848 neg->service.hdr.tag_type = PTT_SRV_NAME; 849 neg->service.hdr.tag_len = 850 htons((u_int16_t)ourmsg->data_len); 851 852 if (ourmsg->data_len) 853 bcopy(ourmsg->data, neg->service.data, 854 ourmsg->data_len); 855 neg->service_len = ourmsg->data_len; 856 neg->pkt->pkt_header.ph.code = PADT_CODE; 857 /* 858 * wait for PADI packet coming from ethernet 859 */ 860 sp->state = PPPOE_LISTENING; 861 break; 862 case NGM_PPPOE_OFFER: 863 /* 864 * Check the hook exists and is Uninitialised. 865 * Store the originator of this message so we can send 866 * a success of fail message to them later. 867 * Store the AC-Name given and go to PRIMED. 868 */ 869 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 870 neg->ac_name.hdr.tag_len = 871 htons((u_int16_t)ourmsg->data_len); 872 if (ourmsg->data_len) 873 bcopy(ourmsg->data, neg->ac_name.data, 874 ourmsg->data_len); 875 neg->ac_name_len = ourmsg->data_len; 876 neg->pkt->pkt_header.ph.code = PADO_CODE; 877 /* 878 * Wait for PADI packet coming from hook 879 */ 880 sp->state = PPPOE_PRIMED; 881 break; 882 case NGM_PPPOE_SERVICE: 883 /* 884 * Check the session is primed. 885 * for now just allow ONE service to be advertised. 886 * If you do it twice you just overwrite. 887 */ 888 if (sp->state != PPPOE_PRIMED) { 889 printf("pppoe: Session not primed\n"); 890 LEAVE(EISCONN); 891 } 892 neg = sp->neg; 893 neg->service.hdr.tag_type = PTT_SRV_NAME; 894 neg->service.hdr.tag_len = 895 htons((u_int16_t)ourmsg->data_len); 896 897 if (ourmsg->data_len) 898 bcopy(ourmsg->data, neg->service.data, 899 ourmsg->data_len); 900 neg->service_len = ourmsg->data_len; 901 break; 902 case NGM_PPPOE_SETMODE: 903 { 904 const struct ng_pppoe_mode_t *mode; 905 char *s; 906 size_t len; 907 908 if (msg->header.arglen == 0) 909 LEAVE(EINVAL); 910 911 s = (char *)msg->data; 912 len = msg->header.arglen - 1; 913 914 /* Search for matching mode string */ 915 for (mode = ng_pppoe_modes; mode->id != 0; mode++ ) 916 if ((strlen(mode->name) == len) && 917 !strncmp(mode->name, s, len)) 918 break; /* found */ 919 920 if (mode->id != 0) 921 privp->mode = mode; 922 else 923 LEAVE(EINVAL); 924 break; 925 } 926 case NGM_PPPOE_GETMODE: 927 NG_MKRESPONSE(resp, msg, strlen(privp->mode->name) + 1, 928 M_NOWAIT); 929 if (resp == NULL) 930 LEAVE(ENOMEM); 931 strlcpy((char *)resp->data, privp->mode->name, 932 strlen(privp->mode->name) + 1); 933 break; 934 default: 935 LEAVE(EINVAL); 936 } 937 break; 938 default: 939 LEAVE(EINVAL); 940 } 941 942 /* Take care of synchronous response, if any */ 943 quit: 944 NG_RESPOND_MSG(error, node, item, resp); 945 /* Free the message and return */ 946 NG_FREE_MSG(msg); 947 return(error); 948 } 949 950 /* 951 * Start a client into the first state. A separate function because 952 * it can be needed if the negotiation times out. 953 */ 954 static void 955 pppoe_start(sessp sp) 956 { 957 priv_p privp = NG_NODE_PRIVATE(NG_PPPOE_SESSION_NODE(sp)); 958 struct { 959 struct pppoe_tag hdr; 960 union uniq data; 961 } __packed uniqtag; 962 963 /* 964 * kick the state machine into starting up 965 */ 966 DBG; 967 sp->state = PPPOE_SINIT; 968 /* Reset the packet header to broadcast. Since we are in a client 969 * mode use configured ethertype. */ 970 memcpy((void *)&sp->neg->pkt->pkt_header.eh, 971 (const void *)privp->mode->eh_prototype, 972 sizeof(struct ether_header)); 973 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 974 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 975 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 976 uniqtag.data.pointer = sp; 977 init_tags(sp); 978 insert_tag(sp, &uniqtag.hdr); 979 insert_tag(sp, &sp->neg->service.hdr); 980 make_packet(sp); 981 sendpacket(sp); 982 } 983 984 static int 985 send_acname(sessp sp, const struct pppoe_tag *tag) 986 { 987 int error, tlen; 988 struct ng_mesg *msg; 989 struct ngpppoe_sts *sts; 990 991 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 992 sizeof(struct ngpppoe_sts), M_NOWAIT); 993 if (msg == NULL) 994 return (ENOMEM); 995 996 sts = (struct ngpppoe_sts *)msg->data; 997 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 998 strncpy(sts->hook, tag->tag_data, tlen); 999 sts->hook[tlen] = '\0'; 1000 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1001 1002 return (error); 1003 } 1004 1005 static int 1006 send_sessionid(sessp sp) 1007 { 1008 int error; 1009 struct ng_mesg *msg; 1010 1011 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1012 sizeof(u_int16_t), M_NOWAIT); 1013 if (msg == NULL) 1014 return (ENOMEM); 1015 1016 *(u_int16_t *)msg->data = sp->Session_ID; 1017 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1018 1019 return (error); 1020 } 1021 1022 /* 1023 * Receive data, and do something with it. 1024 * The caller will never free m, so if we use up this data 1025 * or abort we must free it. 1026 */ 1027 static int 1028 ng_pppoe_rcvdata(hook_p hook, item_p item) 1029 { 1030 node_p node = NG_HOOK_NODE(hook); 1031 const priv_p privp = NG_NODE_PRIVATE(node); 1032 sessp sp = NG_HOOK_PRIVATE(hook); 1033 const struct pppoe_full_hdr *wh; 1034 const struct pppoe_hdr *ph; 1035 int error = 0; 1036 u_int16_t session; 1037 u_int16_t length; 1038 u_int8_t code; 1039 const struct pppoe_tag *utag = NULL, *tag = NULL; 1040 hook_p sendhook; 1041 struct { 1042 struct pppoe_tag hdr; 1043 union uniq data; 1044 } __packed uniqtag; 1045 negp neg = NULL; 1046 struct mbuf *m; 1047 1048 DBG; 1049 NGI_GET_M(item, m); 1050 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1051 /* 1052 * Data from the debug hook gets sent without modification 1053 * straight to the ethernet. 1054 */ 1055 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 1056 privp->packets_out++; 1057 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1058 /* 1059 * Incoming data. 1060 * Dig out various fields from the packet. 1061 * use them to decide where to send it. 1062 */ 1063 1064 privp->packets_in++; 1065 if( m->m_len < sizeof(*wh)) { 1066 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1067 if (m == NULL) { 1068 printf("couldn't m_pullup\n"); 1069 LEAVE(ENOBUFS); 1070 } 1071 } 1072 wh = mtod(m, struct pppoe_full_hdr *); 1073 length = ntohs(wh->ph.length); 1074 switch(wh->eh.ether_type) { 1075 case ETHERTYPE_PPPOE_STUPID_DISC: /* fall through */ 1076 case ETHERTYPE_PPPOE_DISC: 1077 /* 1078 * We need to try to make sure that the tag area 1079 * is contiguous, or we could wander off the end 1080 * of a buffer and make a mess. 1081 * (Linux wouldn't have this problem). 1082 */ 1083 if (m->m_pkthdr.len <= MHLEN) { 1084 if( m->m_len < m->m_pkthdr.len) { 1085 m = m_pullup(m, m->m_pkthdr.len); 1086 if (m == NULL) { 1087 printf("couldn't m_pullup\n"); 1088 LEAVE(ENOBUFS); 1089 } 1090 } 1091 } 1092 if (m->m_len != m->m_pkthdr.len) { 1093 /* 1094 * It's not all in one piece. 1095 * We need to do extra work. 1096 * Put it into a cluster. 1097 */ 1098 struct mbuf *n; 1099 n = m_dup(m, M_DONTWAIT); 1100 m_freem(m); 1101 m = n; 1102 if (m) { 1103 /* just check we got a cluster */ 1104 if (m->m_len != m->m_pkthdr.len) { 1105 m_freem(m); 1106 m = NULL; 1107 } 1108 } 1109 if (m == NULL) { 1110 printf("packet fragmented\n"); 1111 LEAVE(EMSGSIZE); 1112 } 1113 } 1114 wh = mtod(m, struct pppoe_full_hdr *); 1115 length = ntohs(wh->ph.length); 1116 ph = &wh->ph; 1117 session = ntohs(wh->ph.sid); 1118 code = wh->ph.code; 1119 1120 switch(code) { 1121 case PADI_CODE: 1122 /* 1123 * We are a server: 1124 * Look for a hook with the required service 1125 * and send the ENTIRE packet up there. 1126 * It should come back to a new hook in 1127 * PRIMED state. Look there for further 1128 * processing. 1129 */ 1130 tag = get_tag(ph, PTT_SRV_NAME); 1131 if (tag == NULL) { 1132 printf("no service tag\n"); 1133 LEAVE(ENETUNREACH); 1134 } 1135 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1136 tag->tag_data, ntohs(tag->tag_len), 1137 NG_MATCH_ANY); 1138 if (sendhook) { 1139 NG_FWD_NEW_DATA(error, item, 1140 sendhook, m); 1141 } else { 1142 LEAVE(ENETUNREACH); 1143 } 1144 break; 1145 case PADO_CODE: 1146 /* 1147 * We are a client: 1148 * Use the host_uniq tag to find the 1149 * hook this is in response to. 1150 * Received #2, now send #3 1151 * For now simply accept the first we receive. 1152 */ 1153 utag = get_tag(ph, PTT_HOST_UNIQ); 1154 if ((utag == NULL) 1155 || (ntohs(utag->tag_len) != sizeof(sp))) { 1156 printf("no host unique field\n"); 1157 LEAVE(ENETUNREACH); 1158 } 1159 1160 sendhook = pppoe_finduniq(node, utag); 1161 if (sendhook == NULL) { 1162 printf("no matching session\n"); 1163 LEAVE(ENETUNREACH); 1164 } 1165 1166 /* 1167 * Check the session is in the right state. 1168 * It needs to be in PPPOE_SINIT. 1169 */ 1170 sp = NG_HOOK_PRIVATE(sendhook); 1171 if (sp->state != PPPOE_SINIT) { 1172 printf("session in wrong state\n"); 1173 LEAVE(ENETUNREACH); 1174 } 1175 neg = sp->neg; 1176 ng_uncallout(&neg->handle, node); 1177 1178 /* 1179 * This is the first time we hear 1180 * from the server, so note it's 1181 * unicast address, replacing the 1182 * broadcast address . 1183 */ 1184 bcopy(wh->eh.ether_shost, 1185 neg->pkt->pkt_header.eh.ether_dhost, 1186 ETHER_ADDR_LEN); 1187 neg->timeout = 0; 1188 neg->pkt->pkt_header.ph.code = PADR_CODE; 1189 init_tags(sp); 1190 insert_tag(sp, utag); /* Host Unique */ 1191 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1192 insert_tag(sp, tag); /* return cookie */ 1193 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1194 insert_tag(sp, tag); /* return it */ 1195 send_acname(sp, tag); 1196 } 1197 insert_tag(sp, &neg->service.hdr); /* Service */ 1198 scan_tags(sp, ph); 1199 make_packet(sp); 1200 sp->state = PPPOE_SREQ; 1201 sendpacket(sp); 1202 break; 1203 case PADR_CODE: 1204 1205 /* 1206 * We are a server: 1207 * Use the ac_cookie tag to find the 1208 * hook this is in response to. 1209 */ 1210 utag = get_tag(ph, PTT_AC_COOKIE); 1211 if ((utag == NULL) 1212 || (ntohs(utag->tag_len) != sizeof(sp))) { 1213 LEAVE(ENETUNREACH); 1214 } 1215 1216 sendhook = pppoe_finduniq(node, utag); 1217 if (sendhook == NULL) { 1218 LEAVE(ENETUNREACH); 1219 } 1220 1221 /* 1222 * Check the session is in the right state. 1223 * It needs to be in PPPOE_SOFFER 1224 * or PPPOE_NEWCONNECTED. If the latter, 1225 * then this is a retry by the client. 1226 * so be nice, and resend. 1227 */ 1228 sp = NG_HOOK_PRIVATE(sendhook); 1229 if (sp->state == PPPOE_NEWCONNECTED) { 1230 /* 1231 * Whoa! drop back to resend that 1232 * PADS packet. 1233 * We should still have a copy of it. 1234 */ 1235 sp->state = PPPOE_SOFFER; 1236 } 1237 if (sp->state != PPPOE_SOFFER) { 1238 LEAVE (ENETUNREACH); 1239 break; 1240 } 1241 neg = sp->neg; 1242 ng_uncallout(&neg->handle, node); 1243 neg->pkt->pkt_header.ph.code = PADS_CODE; 1244 if (sp->Session_ID == 0) 1245 neg->pkt->pkt_header.ph.sid = 1246 htons(sp->Session_ID 1247 = get_new_sid(node)); 1248 send_sessionid(sp); 1249 neg->timeout = 0; 1250 /* 1251 * start working out the tags to respond with. 1252 */ 1253 init_tags(sp); 1254 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1255 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1256 insert_tag(sp, tag);/* return service */ 1257 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1258 insert_tag(sp, tag); /* return it */ 1259 insert_tag(sp, utag); /* ac_cookie */ 1260 scan_tags(sp, ph); 1261 make_packet(sp); 1262 sp->state = PPPOE_NEWCONNECTED; 1263 sendpacket(sp); 1264 /* 1265 * Having sent the last Negotiation header, 1266 * Set up the stored packet header to 1267 * be correct for the actual session. 1268 * But keep the negotialtion stuff 1269 * around in case we need to resend this last 1270 * packet. We'll discard it when we move 1271 * from NEWCONNECTED to CONNECTED 1272 */ 1273 sp->pkt_hdr = neg->pkt->pkt_header; 1274 /* Configure ethertype depending on what 1275 * ethertype was used at discovery phase */ 1276 if (sp->pkt_hdr.eh.ether_type == 1277 ETHERTYPE_PPPOE_STUPID_DISC) 1278 sp->pkt_hdr.eh.ether_type 1279 = ETHERTYPE_PPPOE_STUPID_SESS; 1280 else 1281 sp->pkt_hdr.eh.ether_type 1282 = ETHERTYPE_PPPOE_SESS; 1283 sp->pkt_hdr.ph.code = 0; 1284 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1285 break; 1286 case PADS_CODE: 1287 /* 1288 * We are a client: 1289 * Use the host_uniq tag to find the 1290 * hook this is in response to. 1291 * take the session ID and store it away. 1292 * Also make sure the pre-made header is 1293 * correct and set us into Session mode. 1294 */ 1295 utag = get_tag(ph, PTT_HOST_UNIQ); 1296 if ((utag == NULL) 1297 || (ntohs(utag->tag_len) != sizeof(sp))) { 1298 LEAVE (ENETUNREACH); 1299 break; 1300 } 1301 sendhook = pppoe_finduniq(node, utag); 1302 if (sendhook == NULL) { 1303 LEAVE(ENETUNREACH); 1304 } 1305 1306 /* 1307 * Check the session is in the right state. 1308 * It needs to be in PPPOE_SREQ. 1309 */ 1310 sp = NG_HOOK_PRIVATE(sendhook); 1311 if (sp->state != PPPOE_SREQ) { 1312 LEAVE(ENETUNREACH); 1313 } 1314 neg = sp->neg; 1315 ng_uncallout(&neg->handle, node); 1316 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1317 sp->Session_ID = ntohs(wh->ph.sid); 1318 send_sessionid(sp); 1319 neg->timeout = 0; 1320 sp->state = PPPOE_CONNECTED; 1321 /* 1322 * Now we have gone to Connected mode, 1323 * Free all resources needed for 1324 * negotiation. 1325 * Keep a copy of the header we will be using. 1326 */ 1327 sp->pkt_hdr = neg->pkt->pkt_header; 1328 if (privp->mode->id == PPPOE_NONSTANDARD) 1329 sp->pkt_hdr.eh.ether_type 1330 = ETHERTYPE_PPPOE_STUPID_SESS; 1331 else 1332 sp->pkt_hdr.eh.ether_type 1333 = ETHERTYPE_PPPOE_SESS; 1334 sp->pkt_hdr.ph.code = 0; 1335 m_freem(neg->m); 1336 FREE(sp->neg, M_NETGRAPH_PPPOE); 1337 sp->neg = NULL; 1338 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1339 break; 1340 case PADT_CODE: 1341 /* 1342 * Send a 'close' message to the controlling 1343 * process (the one that set us up); 1344 * And then tear everything down. 1345 * 1346 * Find matching peer/session combination. 1347 */ 1348 sendhook = pppoe_findsession(node, wh); 1349 if (sendhook == NULL) { 1350 LEAVE(ENETUNREACH); 1351 } 1352 /* send message to creator */ 1353 /* close hook */ 1354 if (sendhook) { 1355 ng_rmhook_self(sendhook); 1356 } 1357 break; 1358 default: 1359 LEAVE(EPFNOSUPPORT); 1360 } 1361 break; 1362 case ETHERTYPE_PPPOE_STUPID_SESS: 1363 case ETHERTYPE_PPPOE_SESS: 1364 /* 1365 * find matching peer/session combination. 1366 */ 1367 sendhook = pppoe_findsession(node, wh); 1368 if (sendhook == NULL) { 1369 LEAVE (ENETUNREACH); 1370 break; 1371 } 1372 sp = NG_HOOK_PRIVATE(sendhook); 1373 m_adj(m, sizeof(*wh)); 1374 if (m->m_pkthdr.len < length) { 1375 /* Packet too short, dump it */ 1376 LEAVE(EMSGSIZE); 1377 } 1378 1379 /* Also need to trim excess at the end */ 1380 if (m->m_pkthdr.len > length) { 1381 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1382 } 1383 if ( sp->state != PPPOE_CONNECTED) { 1384 if (sp->state == PPPOE_NEWCONNECTED) { 1385 sp->state = PPPOE_CONNECTED; 1386 /* 1387 * Now we have gone to Connected mode, 1388 * Free all resources needed for 1389 * negotiation. Be paranoid about 1390 * whether there may be a timeout. 1391 */ 1392 m_freem(sp->neg->m); 1393 ng_uncallout(&sp->neg->handle, node); 1394 FREE(sp->neg, M_NETGRAPH_PPPOE); 1395 sp->neg = NULL; 1396 } else { 1397 LEAVE (ENETUNREACH); 1398 break; 1399 } 1400 } 1401 NG_FWD_NEW_DATA( error, item, sendhook, m); 1402 break; 1403 default: 1404 LEAVE(EPFNOSUPPORT); 1405 } 1406 } else { 1407 /* 1408 * Not ethernet or debug hook.. 1409 * 1410 * The packet has come in on a normal hook. 1411 * We need to find out what kind of hook, 1412 * So we can decide how to handle it. 1413 * Check the hook's state. 1414 */ 1415 sp = NG_HOOK_PRIVATE(hook); 1416 switch (sp->state) { 1417 case PPPOE_NEWCONNECTED: 1418 case PPPOE_CONNECTED: { 1419 static const u_char addrctrl[] = { 0xff, 0x03 }; 1420 struct pppoe_full_hdr *wh; 1421 1422 /* 1423 * Remove PPP address and control fields, if any. 1424 * For example, ng_ppp(4) always sends LCP packets 1425 * with address and control fields as required by 1426 * generic PPP. PPPoE is an exception to the rule. 1427 */ 1428 if (m->m_pkthdr.len >= 2) { 1429 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1430 LEAVE(ENOBUFS); 1431 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1432 m_adj(m, 2); 1433 } 1434 /* 1435 * Bang in a pre-made header, and set the length up 1436 * to be correct. Then send it to the ethernet driver. 1437 * But first correct the length. 1438 */ 1439 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1440 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1441 if (m == NULL) { 1442 LEAVE(ENOBUFS); 1443 } 1444 wh = mtod(m, struct pppoe_full_hdr *); 1445 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1446 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1447 privp->packets_out++; 1448 break; 1449 } 1450 case PPPOE_PRIMED: 1451 /* 1452 * A PADI packet is being returned by the application 1453 * that has set up this hook. This indicates that it 1454 * wants us to offer service. 1455 */ 1456 neg = sp->neg; 1457 if (m->m_len < sizeof(*wh)) { 1458 m = m_pullup(m, sizeof(*wh)); 1459 if (m == NULL) { 1460 LEAVE(ENOBUFS); 1461 } 1462 } 1463 wh = mtod(m, struct pppoe_full_hdr *); 1464 ph = &wh->ph; 1465 session = ntohs(wh->ph.sid); 1466 length = ntohs(wh->ph.length); 1467 code = wh->ph.code; 1468 /* Use peers mode in session */ 1469 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1470 if ( code != PADI_CODE) { 1471 LEAVE(EINVAL); 1472 }; 1473 ng_uncallout(&neg->handle, node); 1474 1475 /* 1476 * This is the first time we hear 1477 * from the client, so note it's 1478 * unicast address, replacing the 1479 * broadcast address. 1480 */ 1481 bcopy(wh->eh.ether_shost, 1482 neg->pkt->pkt_header.eh.ether_dhost, 1483 ETHER_ADDR_LEN); 1484 sp->state = PPPOE_SOFFER; 1485 neg->timeout = 0; 1486 neg->pkt->pkt_header.ph.code = PADO_CODE; 1487 1488 /* 1489 * start working out the tags to respond with. 1490 */ 1491 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1492 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1493 uniqtag.data.pointer = sp; 1494 init_tags(sp); 1495 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1496 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1497 insert_tag(sp, tag); /* return service */ 1498 /* 1499 * If we have a NULL service request 1500 * and have an extra service defined in this hook, 1501 * then also add a tag for the extra service. 1502 * XXX this is a hack. eventually we should be able 1503 * to support advertising many services, not just one 1504 */ 1505 if (((tag == NULL) || (tag->tag_len == 0)) 1506 && (neg->service.hdr.tag_len != 0)) { 1507 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1508 } 1509 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1510 insert_tag(sp, tag); /* returned hostunique */ 1511 insert_tag(sp, &uniqtag.hdr); 1512 scan_tags(sp, ph); 1513 make_packet(sp); 1514 sendpacket(sp); 1515 break; 1516 1517 /* 1518 * Packets coming from the hook make no sense 1519 * to sessions in these states. Throw them away. 1520 */ 1521 case PPPOE_SINIT: 1522 case PPPOE_SREQ: 1523 case PPPOE_SOFFER: 1524 case PPPOE_SNONE: 1525 case PPPOE_LISTENING: 1526 case PPPOE_DEAD: 1527 default: 1528 LEAVE(ENETUNREACH); 1529 } 1530 } 1531 quit: 1532 if (item) 1533 NG_FREE_ITEM(item); 1534 NG_FREE_M(m); 1535 return error; 1536 } 1537 1538 /* 1539 * Do local shutdown processing.. 1540 * If we are a persistant device, we might refuse to go away, and 1541 * we'd only remove our links and reset ourself. 1542 */ 1543 static int 1544 ng_pppoe_shutdown(node_p node) 1545 { 1546 const priv_p privdata = NG_NODE_PRIVATE(node); 1547 1548 DBG; 1549 NG_NODE_SET_PRIVATE(node, NULL); 1550 NG_NODE_UNREF(privdata->node); 1551 FREE(privdata, M_NETGRAPH_PPPOE); 1552 return (0); 1553 } 1554 1555 /* 1556 * This is called once we've already connected a new hook to the other node. 1557 * It gives us a chance to balk at the last minute. 1558 */ 1559 static int 1560 ng_pppoe_connect(hook_p hook) 1561 { 1562 /* be really amiable and just say "YUP that's OK by me! " */ 1563 return (0); 1564 } 1565 1566 /* 1567 * Hook disconnection 1568 * 1569 * Clean up all dangling links and information about the session/hook. 1570 * For this type, removal of the last link destroys the node 1571 */ 1572 static int 1573 ng_pppoe_disconnect(hook_p hook) 1574 { 1575 node_p node = NG_HOOK_NODE(hook); 1576 priv_p privp = NG_NODE_PRIVATE(node); 1577 sessp sp; 1578 int hooks; 1579 1580 DBG; 1581 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1582 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1583 privp->debug_hook = NULL; 1584 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1585 privp->ethernet_hook = NULL; 1586 if (NG_NODE_IS_VALID(node)) 1587 ng_rmnode_self(node); 1588 } else { 1589 sp = NG_HOOK_PRIVATE(hook); 1590 if (sp->state != PPPOE_SNONE ) { 1591 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1592 } 1593 /* 1594 * According to the spec, if we are connected, 1595 * we should send a DISC packet if we are shutting down 1596 * a session. 1597 */ 1598 if ((privp->ethernet_hook) 1599 && ((sp->state == PPPOE_CONNECTED) 1600 || (sp->state == PPPOE_NEWCONNECTED))) { 1601 struct mbuf *m; 1602 struct pppoe_full_hdr *wh; 1603 struct pppoe_tag *tag; 1604 int msglen = strlen(SIGNOFF); 1605 int error = 0; 1606 1607 /* revert the stored header to DISC/PADT mode */ 1608 wh = &sp->pkt_hdr; 1609 wh->ph.code = PADT_CODE; 1610 /* Configure ethertype depending on what was used during 1611 * sessions stage. */ 1612 if (sp->pkt_hdr.eh.ether_type == 1613 ETHERTYPE_PPPOE_STUPID_SESS) 1614 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1615 else 1616 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1617 1618 /* generate a packet of that type */ 1619 MGETHDR(m, M_DONTWAIT, MT_DATA); 1620 if(m == NULL) 1621 printf("pppoe: Session out of mbufs\n"); 1622 else { 1623 m->m_pkthdr.rcvif = NULL; 1624 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1625 bcopy((caddr_t)wh, mtod(m, caddr_t), 1626 sizeof(*wh)); 1627 /* 1628 * Add a General error message and adjust 1629 * sizes 1630 */ 1631 wh = mtod(m, struct pppoe_full_hdr *); 1632 tag = wh->ph.tag; 1633 tag->tag_type = PTT_GEN_ERR; 1634 tag->tag_len = htons((u_int16_t)msglen); 1635 strncpy(tag->tag_data, SIGNOFF, msglen); 1636 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1637 msglen); 1638 wh->ph.length = htons(sizeof(*tag) + msglen); 1639 NG_SEND_DATA_ONLY(error, 1640 privp->ethernet_hook, m); 1641 } 1642 } 1643 /* 1644 * As long as we have somewhere to store the timeout handle, 1645 * we may have a timeout pending.. get rid of it. 1646 */ 1647 if (sp->neg) { 1648 ng_uncallout(&sp->neg->handle, node); 1649 if (sp->neg->m) 1650 m_freem(sp->neg->m); 1651 FREE(sp->neg, M_NETGRAPH_PPPOE); 1652 } 1653 FREE(sp, M_NETGRAPH_PPPOE); 1654 NG_HOOK_SET_PRIVATE(hook, NULL); 1655 /* work out how many session hooks there are */ 1656 /* Node goes away on last session hook removal */ 1657 if (privp->ethernet_hook) hooks -= 1; 1658 if (privp->debug_hook) hooks -= 1; 1659 } 1660 if ((NG_NODE_NUMHOOKS(node) == 0) 1661 && (NG_NODE_IS_VALID(node))) 1662 ng_rmnode_self(node); 1663 return (0); 1664 } 1665 1666 /* 1667 * timeouts come here. 1668 */ 1669 static void 1670 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 1671 { 1672 sessp sp = NG_HOOK_PRIVATE(hook); 1673 negp neg = sp->neg; 1674 int error = 0; 1675 struct mbuf *m0 = NULL; 1676 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1677 1678 DBG; 1679 switch(sp->state) { 1680 /* 1681 * resend the last packet, using an exponential backoff. 1682 * After a period of time, stop growing the backoff, 1683 * and either leave it, or revert to the start. 1684 */ 1685 case PPPOE_SINIT: 1686 case PPPOE_SREQ: 1687 /* timeouts on these produce resends */ 1688 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1689 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1690 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 1691 pppoe_ticker, NULL, 0); 1692 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1693 if (sp->state == PPPOE_SREQ) { 1694 /* revert to SINIT mode */ 1695 pppoe_start(sp); 1696 } else { 1697 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1698 } 1699 } 1700 break; 1701 case PPPOE_PRIMED: 1702 case PPPOE_SOFFER: 1703 /* a timeout on these says "give up" */ 1704 ng_rmhook_self(hook); 1705 break; 1706 default: 1707 /* timeouts have no meaning in other states */ 1708 printf("pppoe: unexpected timeout\n"); 1709 } 1710 } 1711 1712 1713 static void 1714 sendpacket(sessp sp) 1715 { 1716 struct mbuf *m0 = NULL; 1717 hook_p hook = sp->hook; 1718 node_p node = NG_HOOK_NODE(hook); 1719 priv_p privp = NG_NODE_PRIVATE(node); 1720 negp neg = sp->neg; 1721 int error = 0; 1722 1723 DBG; 1724 switch(sp->state) { 1725 case PPPOE_LISTENING: 1726 case PPPOE_DEAD: 1727 case PPPOE_SNONE: 1728 case PPPOE_CONNECTED: 1729 printf("pppoe: sendpacket: unexpected state\n"); 1730 break; 1731 1732 case PPPOE_NEWCONNECTED: 1733 /* send the PADS without a timeout - we're now connected */ 1734 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1735 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1736 break; 1737 1738 case PPPOE_PRIMED: 1739 /* No packet to send, but set up the timeout */ 1740 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1741 pppoe_ticker, NULL, 0); 1742 break; 1743 1744 case PPPOE_SOFFER: 1745 /* 1746 * send the offer but if they don't respond 1747 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1748 */ 1749 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1750 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1751 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1752 pppoe_ticker, NULL, 0); 1753 break; 1754 1755 case PPPOE_SINIT: 1756 case PPPOE_SREQ: 1757 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1758 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1759 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1760 pppoe_ticker, NULL, 0); 1761 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1762 break; 1763 1764 default: 1765 error = EINVAL; 1766 printf("pppoe: timeout: bad state\n"); 1767 } 1768 /* return (error); */ 1769 } 1770 1771 /* 1772 * Parse an incoming packet to see if any tags should be copied to the 1773 * output packet. Don't do any tags that have been handled in the main 1774 * state machine. 1775 */ 1776 static const struct pppoe_tag* 1777 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1778 { 1779 const char *const end = (const char *)next_tag(ph); 1780 const char *ptn; 1781 const struct pppoe_tag *pt = &ph->tag[0]; 1782 /* 1783 * Keep processing tags while a tag header will still fit. 1784 */ 1785 DBG; 1786 while((const char*)(pt + 1) <= end) { 1787 /* 1788 * If the tag data would go past the end of the packet, abort. 1789 */ 1790 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1791 if(ptn > end) 1792 return NULL; 1793 1794 switch (pt->tag_type) { 1795 case PTT_RELAY_SID: 1796 insert_tag(sp, pt); 1797 break; 1798 case PTT_EOL: 1799 return NULL; 1800 case PTT_SRV_NAME: 1801 case PTT_AC_NAME: 1802 case PTT_HOST_UNIQ: 1803 case PTT_AC_COOKIE: 1804 case PTT_VENDOR: 1805 case PTT_SRV_ERR: 1806 case PTT_SYS_ERR: 1807 case PTT_GEN_ERR: 1808 break; 1809 } 1810 pt = (const struct pppoe_tag*)ptn; 1811 } 1812 return NULL; 1813 } 1814 1815 static int 1816 pppoe_send_event(sessp sp, enum cmd cmdid) 1817 { 1818 int error; 1819 struct ng_mesg *msg; 1820 struct ngpppoe_sts *sts; 1821 1822 DBG; 1823 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1824 sizeof(struct ngpppoe_sts), M_NOWAIT); 1825 if (msg == NULL) 1826 return (ENOMEM); 1827 sts = (struct ngpppoe_sts *)msg->data; 1828 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1829 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1830 return (error); 1831 } 1832