ng_pppoe.c revision 70700
1193323Sed 2193323Sed/* 3193323Sed * ng_pppoe.c 4193323Sed * 5193323Sed * Copyright (c) 1996-1999 Whistle Communications, Inc. 6193323Sed * All rights reserved. 7193323Sed * 8193323Sed * Subject to the following obligations and disclaimer of warranty, use and 9193323Sed * redistribution of this software, in source or object code forms, with or 10193323Sed * without modifications are expressly permitted by Whistle Communications; 11193323Sed * provided, however, that: 12193323Sed * 1. Any and all reproductions of the source or object code must include the 13193323Sed * copyright notice above and the following disclaimer of warranties; and 14193323Sed * 2. No rights are granted, in any manner or form, to use Whistle 15193323Sed * Communications, Inc. trademarks, including the mark "WHISTLE 16193323Sed * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17249423Sdim * such appears in the above copyright notice or in the software. 18193323Sed * 19193323Sed * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20249423Sdim * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21249423Sdim * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22249423Sdim * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23249423Sdim * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24263508Sdim * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25193323Sed * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26193323Sed * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27193323Sed * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28193323Sed * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29193323Sed * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30195340Sed * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31249423Sdim * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32193323Sed * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33193323Sed * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34193323Sed * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35193323Sed * OF SUCH DAMAGE. 36193323Sed * 37193323Sed * Author: Julian Elischer <julian@freebsd.org> 38249423Sdim * 39193323Sed * $FreeBSD: head/sys/netgraph/ng_pppoe.c 70700 2001-01-06 00:46:47Z julian $ 40193323Sed * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41193323Sed */ 42193323Sed#if 0 43193323Sed#define AAA printf("pppoe: %s\n", __FUNCTION__ ); 44193323Sed#define BBB printf("-%d-", __LINE__ ); 45193323Sed#else 46193323Sed#define AAA 47193323Sed#define BBB 48224145Sdim#endif 49193323Sed 50224145Sdim#include <sys/param.h> 51193323Sed#include <sys/systm.h> 52193323Sed#include <sys/kernel.h> 53193323Sed#include <sys/mbuf.h> 54193323Sed#include <sys/malloc.h> 55193323Sed#include <sys/errno.h> 56193323Sed#include <net/ethernet.h> 57193323Sed 58193323Sed#include <netgraph/ng_message.h> 59193323Sed#include <netgraph/netgraph.h> 60193323Sed#include <netgraph/ng_parse.h> 61249423Sdim#include <netgraph/ng_pppoe.h> 62193323Sed 63193323Sed#define SIGNOFF "session closed" 64193323Sed#define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 65193323Sed 66249423Sdim/* 67193323Sed * This section contains the netgraph method declarations for the 68193323Sed * sample node. These methods define the netgraph 'type'. 69193323Sed */ 70193323Sed 71249423Sdimstatic ng_constructor_t ng_pppoe_constructor; 72193323Sedstatic ng_rcvmsg_t ng_pppoe_rcvmsg; 73193323Sedstatic ng_shutdown_t ng_pppoe_shutdown; 74193323Sedstatic ng_newhook_t ng_pppoe_newhook; 75193323Sedstatic ng_connect_t ng_pppoe_connect; 76193323Sedstatic ng_rcvdata_t ng_pppoe_rcvdata; 77193323Sedstatic ng_disconnect_t ng_pppoe_disconnect; 78193323Sed 79249423Sdim/* Parse type for struct ngpppoe_init_data */ 80226633Sdimstatic const struct ng_parse_struct_info ngpppoe_init_data_type_info 81226633Sdim = NG_PPPOE_INIT_DATA_TYPE_INFO; 82249423Sdimstatic const struct ng_parse_type ngpppoe_init_data_state_type = { 83193323Sed &ng_parse_struct_type, 84249423Sdim &ngpppoe_init_data_type_info 85193323Sed}; 86193323Sed 87193323Sed/* Parse type for struct ngpppoe_sts */ 88193323Sedstatic const struct ng_parse_struct_info ng_pppoe_sts_type_info 89193323Sed = NG_PPPOE_STS_TYPE_INFO; 90198090Srdivackystatic const struct ng_parse_type ng_pppoe_sts_state_type = { 91198090Srdivacky &ng_parse_struct_type, 92198090Srdivacky &ng_pppoe_sts_type_info 93198090Srdivacky}; 94198090Srdivacky 95198090Srdivacky/* List of commands and how to convert arguments to/from ASCII */ 96198090Srdivackystatic const struct ng_cmdlist ng_pppoe_cmds[] = { 97249423Sdim { 98198892Srdivacky NGM_PPPOE_COOKIE, 99198090Srdivacky NGM_PPPOE_CONNECT, 100198090Srdivacky "pppoe_connect", 101198090Srdivacky &ngpppoe_init_data_state_type, 102198090Srdivacky NULL 103198090Srdivacky }, 104198090Srdivacky { 105198090Srdivacky NGM_PPPOE_COOKIE, 106198090Srdivacky NGM_PPPOE_LISTEN, 107198090Srdivacky "pppoe_listen", 108198090Srdivacky &ngpppoe_init_data_state_type, 109198090Srdivacky NULL 110249423Sdim }, 111198090Srdivacky { 112198090Srdivacky NGM_PPPOE_COOKIE, 113198090Srdivacky NGM_PPPOE_OFFER, 114198090Srdivacky "pppoe_offer", 115249423Sdim &ngpppoe_init_data_state_type, 116198090Srdivacky NULL 117198090Srdivacky }, 118198090Srdivacky { 119198090Srdivacky NGM_PPPOE_COOKIE, 120198090Srdivacky NGM_PPPOE_SERVICE, 121198090Srdivacky "pppoe_service", 122198090Srdivacky &ngpppoe_init_data_state_type, 123198090Srdivacky NULL 124198090Srdivacky }, 125203954Srdivacky { 126198892Srdivacky NGM_PPPOE_COOKIE, 127203954Srdivacky NGM_PPPOE_SUCCESS, 128193323Sed "pppoe_success", 129203954Srdivacky &ng_pppoe_sts_state_type, 130234353Sdim NULL 131193323Sed }, 132234353Sdim { 133234353Sdim NGM_PPPOE_COOKIE, 134234353Sdim NGM_PPPOE_FAIL, 135249423Sdim "pppoe_fail", 136224145Sdim &ng_pppoe_sts_state_type, 137193323Sed NULL 138198090Srdivacky }, 139198090Srdivacky { 140234353Sdim NGM_PPPOE_COOKIE, 141198090Srdivacky NGM_PPPOE_CLOSE, 142193323Sed "pppoe_close", 143193323Sed &ng_pppoe_sts_state_type, 144263508Sdim NULL 145249423Sdim }, 146263508Sdim { 0 } 147263508Sdim}; 148193323Sed 149193323Sed/* Netgraph node type descriptor */ 150193323Sedstatic struct ng_type typestruct = { 151249423Sdim NG_ABI_VERSION, 152249423Sdim NG_PPPOE_NODE_TYPE, 153249423Sdim NULL, 154249423Sdim ng_pppoe_constructor, 155249423Sdim ng_pppoe_rcvmsg, 156193323Sed ng_pppoe_shutdown, 157193323Sed ng_pppoe_newhook, 158193323Sed NULL, 159249423Sdim ng_pppoe_connect, 160193323Sed ng_pppoe_rcvdata, 161193323Sed ng_pppoe_disconnect, 162193323Sed ng_pppoe_cmds 163193323Sed}; 164249423SdimNETGRAPH_INIT(pppoe, &typestruct); 165193323Sed 166193323Sed/* 167193323Sed * States for the session state machine. 168212904Sdim * These have no meaning if there is no hook attached yet. 169212904Sdim */ 170212904Sdimenum state { 171249423Sdim PPPOE_SNONE=0, /* [both] Initial state */ 172234353Sdim PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 173234353Sdim PPPOE_SINIT, /* [Client] Sent discovery initiation */ 174234353Sdim PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 175234353Sdim PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 176249423Sdim PPPOE_SREQ, /* [Client] Sent a Request */ 177193323Sed PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 178203954Srdivacky PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 179203954Srdivacky PPPOE_DEAD /* [Both] */ 180203954Srdivacky}; 181249423Sdim 182198892Srdivacky#define NUMTAGS 20 /* number of tags we are set up to work with */ 183198892Srdivacky 184198892Srdivacky/* 185198892Srdivacky * Information we store for each hook on each node for negotiating the 186212904Sdim * session. The mbuf and cluster are freed once negotiation has completed. 187243830Sdim * The whole negotiation block is then discarded. 188243830Sdim */ 189243830Sdim 190243830Sdimstruct sess_neg { 191243830Sdim struct mbuf *m; /* holds cluster with last sent packet */ 192243830Sdim union packet *pkt; /* points within the above cluster */ 193243830Sdim struct callout_handle timeout_handle; /* see timeout(9) */ 194243830Sdim u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 195243830Sdim u_int numtags; 196263508Sdim struct pppoe_tag *tags[NUMTAGS]; 197263508Sdim u_int service_len; 198193323Sed u_int ac_name_len; 199263508Sdim 200263508Sdim struct datatag service; 201263508Sdim struct datatag ac_name; 202263508Sdim}; 203263508Sdimtypedef struct sess_neg *negp; 204263508Sdim 205263508Sdim/* 206263508Sdim * Session information that is needed after connection. 207263508Sdim */ 208263508Sdimstruct sess_con { 209263508Sdim hook_p hook; 210263508Sdim u_int16_t Session_ID; 211263508Sdim enum state state; 212263508Sdim ng_ID_t creator; /* who to notify */ 213263508Sdim struct pppoe_full_hdr pkt_hdr; /* used when connected */ 214263508Sdim negp neg; /* used when negotiating */ 215263508Sdim /*struct sess_con *hash_next;*/ /* not yet used */ 216263508Sdim}; 217263508Sdimtypedef struct sess_con *sessp; 218263508Sdim 219263508Sdim/* 220263508Sdim * Information we store for each node 221263508Sdim */ 222263508Sdimstruct PPPOE { 223263508Sdim node_p node; /* back pointer to node */ 224263508Sdim hook_p ethernet_hook; 225263508Sdim hook_p debug_hook; 226201360Srdivacky u_int packets_in; /* packets in from ethernet */ 227203954Srdivacky u_int packets_out; /* packets out towards ethernet */ 228234353Sdim u_int32_t flags; 229263508Sdim /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 230243830Sdim}; 231193323Sedtypedef struct PPPOE *priv_p; 232234353Sdim 233234353Sdimconst struct ether_header eh_prototype = 234234353Sdim {{0xff,0xff,0xff,0xff,0xff,0xff}, 235263508Sdim {0x00,0x00,0x00,0x00,0x00,0x00}, 236243830Sdim ETHERTYPE_PPPOE_DISC}; 237234353Sdim 238193323Sedunion uniq { 239193323Sed char bytes[sizeof(void *)]; 240193323Sed void * pointer; 241234353Sdim }; 242234353Sdim 243234353Sdim#define LEAVE(x) do { error = x; goto quit; } while(0) 244193323Sedstatic void pppoe_start(sessp sp); 245249423Sdimstatic void sendpacket(sessp sp); 246203954Srdivackystatic void pppoe_ticker(void *arg); 247203954Srdivackystatic struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 248203954Srdivackystatic int pppoe_send_event(sessp sp, enum cmd cmdid); 249249423Sdim 250203954Srdivacky/************************************************************************* 251203954Srdivacky * Some basic utilities from the Linux version with author's permission.* 252263508Sdim * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 253263508Sdim ************************************************************************/ 254203954Srdivacky 255193323Sed/* 256193323Sed * Generate a new session id 257193323Sed * XXX find out the FreeBSD locking scheme. 258263508Sdim */ 259218893Sdimstatic u_int16_t 260218893Sdimget_new_sid(node_p node) 261218893Sdim{ 262263508Sdim static int pppoe_sid = 10; 263243830Sdim sessp sp; 264243830Sdim hook_p hook; 265243830Sdim u_int16_t val; 266193323Sed priv_p privp = node->private; 267224145Sdim 268226633SdimAAA 269224145Sdimrestart: 270198090Srdivacky val = pppoe_sid++; 271224145Sdim /* 272193323Sed * Spec says 0xFFFF is reserved. 273193323Sed * Also don't use 0x0000 274193323Sed */ 275193323Sed if (val == 0xffff) { 276193323Sed pppoe_sid = 20; 277249423Sdim goto restart; 278193323Sed } 279193323Sed 280249423Sdim /* Check it isn't already in use */ 281193323Sed LIST_FOREACH(hook, &node->hooks, hooks) { 282249423Sdim /* don't check special hooks */ 283193323Sed if ((hook->private == &privp->debug_hook) 284193323Sed || (hook->private == &privp->ethernet_hook)) 285193323Sed continue; 286263508Sdim sp = hook->private; 287193323Sed if (sp->Session_ID == val) 288193323Sed goto restart; 289193323Sed } 290243830Sdim 291243830Sdim return val; 292243830Sdim} 293193323Sed 294193323Sed 295193323Sed/* 296193323Sed * Return the location where the next tag can be put 297193323Sed */ 298193323Sedstatic __inline struct pppoe_tag* 299193323Sednext_tag(struct pppoe_hdr* ph) 300193323Sed{ 301243830Sdim return (struct pppoe_tag*)(((char*)&ph->tag[0]) + ntohs(ph->length)); 302193323Sed} 303193323Sed 304193323Sed/* 305193323Sed * Look for a tag of a specific type 306243830Sdim * Don't trust any length the other end says. 307243830Sdim * but assume we already sanity checked ph->length. 308243830Sdim */ 309243830Sdimstatic struct pppoe_tag* 310263508Sdimget_tag(struct pppoe_hdr* ph, u_int16_t idx) 311243830Sdim{ 312243830Sdim char *end = (char *)next_tag(ph); 313243830Sdim char *ptn; 314243830Sdim struct pppoe_tag *pt = &ph->tag[0]; 315243830Sdim /* 316243830Sdim * Keep processing tags while a tag header will still fit. 317243830Sdim */ 318243830SdimAAA 319243830Sdim while((char*)(pt + 1) <= end) { 320263508Sdim /* 321243830Sdim * If the tag data would go past the end of the packet, abort. 322243830Sdim */ 323193323Sed ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 324193323Sed if(ptn > end) 325193323Sed return NULL; 326243830Sdim 327243830Sdim if(pt->tag_type == idx) 328263508Sdim return pt; 329243830Sdim 330243830Sdim pt = (struct pppoe_tag*)ptn; 331243830Sdim } 332243830Sdim return NULL; 333243830Sdim} 334243830Sdim 335243830Sdim/************************************************************************** 336243830Sdim * inlines to initialise or add tags to a session's tag list, 337243830Sdim **************************************************************************/ 338243830Sdim/* 339263508Sdim * Initialise the session's tag list 340243830Sdim */ 341243830Sdimstatic void 342243830Sdiminit_tags(sessp sp) 343243830Sdim{ 344243830SdimAAA 345243830Sdim if(sp->neg == NULL) { 346243830Sdim printf("pppoe: asked to init NULL neg pointer\n"); 347243830Sdim return; 348243830Sdim } 349263508Sdim sp->neg->numtags = 0; 350263508Sdim} 351263508Sdim 352263508Sdimstatic void 353263508Sdiminsert_tag(sessp sp, struct pppoe_tag *tp) 354263508Sdim{ 355224145Sdim int i; 356263508Sdim negp neg; 357263508Sdim 358263508SdimAAA 359263508Sdim if((neg = sp->neg) == NULL) { 360263508Sdim printf("pppoe: asked to use NULL neg pointer\n"); 361263508Sdim return; 362263508Sdim } 363263508Sdim if ((i = neg->numtags++) < NUMTAGS) { 364263508Sdim neg->tags[i] = tp; 365263508Sdim } else { 366263508Sdim printf("pppoe: asked to add too many tags to packet\n"); 367263508Sdim neg->numtags--; 368263508Sdim } 369263508Sdim} 370234353Sdim 371193323Sed/* 372249423Sdim * Make up a packet, using the tags filled out for the session. 373193323Sed * 374193323Sed * Assume that the actual pppoe header and ethernet header 375193323Sed * are filled out externally to this routine. 376 * Also assume that neg->wh points to the correct 377 * location at the front of the buffer space. 378 */ 379static void 380make_packet(sessp sp) { 381 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 382 struct pppoe_tag **tag; 383 char *dp; 384 int count; 385 int tlen; 386 u_int16_t length = 0; 387 388AAA 389 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 390 printf("pppoe: make_packet called from wrong state\n"); 391 } 392 dp = (char *)wh->ph.tag; 393 for (count = 0, tag = sp->neg->tags; 394 ((count < sp->neg->numtags) && (count < NUMTAGS)); 395 tag++, count++) { 396 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 397 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 398 printf("pppoe: tags too long\n"); 399 sp->neg->numtags = count; 400 break; /* XXX chop off what's too long */ 401 } 402 bcopy((char *)*tag, (char *)dp, tlen); 403 length += tlen; 404 dp += tlen; 405 } 406 wh->ph.length = htons(length); 407 sp->neg->m->m_len = length + sizeof(*wh); 408 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 409} 410 411/************************************************************************** 412 * Routine to match a service offered * 413 **************************************************************************/ 414/* 415 * Find a hook that has a service string that matches that 416 * we are seeking. for now use a simple string. 417 * In the future we may need something like regexp(). 418 * for testing allow a null string to match 1st found and a null service 419 * to match all requests. Also make '*' do the same. 420 */ 421static hook_p 422pppoe_match_svc(node_p node, char *svc_name, int svc_len) 423{ 424 sessp sp = NULL; 425 negp neg = NULL; 426 priv_p privp = node->private; 427 hook_p hook; 428 429AAA 430 LIST_FOREACH(hook, &node->hooks, hooks) { 431 432 /* skip any hook that is debug or ethernet */ 433 if ((hook->private == &privp->debug_hook) 434 || (hook->private == &privp->ethernet_hook)) 435 continue; 436 sp = hook->private; 437 438 /* Skip any sessions which are not in LISTEN mode. */ 439 if ( sp->state != PPPOE_LISTENING) 440 continue; 441 442 neg = sp->neg; 443 /* XXX check validity of this */ 444 /* special case, NULL request. match 1st found. */ 445 if (svc_len == 0) 446 break; 447 448 /* XXX check validity of this */ 449 /* Special case for a blank or "*" service name (wildcard) */ 450 if ((neg->service_len == 0) 451 || ((neg->service_len == 1) 452 && (neg->service.data[0] == '*'))) { 453 break; 454 } 455 456 /* If the lengths don't match, that aint it. */ 457 if (neg->service_len != svc_len) 458 continue; 459 460 /* An exact match? */ 461 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 462 break; 463 } 464 return (hook); 465} 466/************************************************************************** 467 * Routine to find a particular session that matches an incoming packet * 468 **************************************************************************/ 469static hook_p 470pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 471{ 472 sessp sp = NULL; 473 hook_p hook = NULL; 474 priv_p privp = node->private; 475 u_int16_t session = ntohs(wh->ph.sid); 476 477 /* 478 * find matching peer/session combination. 479 */ 480AAA 481 LIST_FOREACH(hook, &node->hooks, hooks) { 482 /* don't check special hooks */ 483 if ((hook->private == &privp->debug_hook) 484 || (hook->private == &privp->ethernet_hook)) { 485 continue; 486 } 487 sp = hook->private; 488 if ( ( (sp->state == PPPOE_CONNECTED) 489 || (sp->state == PPPOE_NEWCONNECTED) ) 490 && (sp->Session_ID == session) 491 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 492 wh->eh.ether_shost, 493 ETHER_ADDR_LEN)) == 0) { 494 break; 495 } 496 } 497 return (hook); 498} 499 500static hook_p 501pppoe_finduniq(node_p node, struct pppoe_tag *tag) 502{ 503 hook_p hook = NULL; 504 priv_p privp = node->private; 505 union uniq uniq; 506 507AAA 508 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 509 /* cycle through all known hooks */ 510 LIST_FOREACH(hook, &node->hooks, hooks) { 511 /* don't check special hooks */ 512 if ((hook->private == &privp->debug_hook) 513 || (hook->private == &privp->ethernet_hook)) 514 continue; 515 if (uniq.pointer == hook->private) 516 break; 517 } 518 return (hook); 519} 520 521/************************************************************************** 522 * start of Netgraph entrypoints * 523 **************************************************************************/ 524 525/* 526 * Allocate the private data structure and the generic node 527 * and link them together. 528 * 529 * ng_make_node_common() returns with a generic node struct 530 * with a single reference for us.. we transfer it to the 531 * private structure.. when we free the private struct we must 532 * unref the node so it gets freed too. 533 */ 534static int 535ng_pppoe_constructor(node_p node) 536{ 537 priv_p privdata; 538 539AAA 540 /* Initialize private descriptor */ 541 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, 542 M_NOWAIT | M_ZERO); 543 if (privdata == NULL) 544 return (ENOMEM); 545 546 /* Link structs together; this counts as our one reference to *nodep */ 547 node->private = privdata; 548 privdata->node = node; 549 return (0); 550} 551 552/* 553 * Give our ok for a hook to be added... 554 * point the hook's private info to the hook structure. 555 * 556 * The following hook names are special: 557 * Ethernet: the hook that should be connected to a NIC. 558 * debug: copies of data sent out here (when I write the code). 559 * All other hook names need only be unique. (the framework checks this). 560 */ 561static int 562ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 563{ 564 const priv_p privp = node->private; 565 sessp sp; 566 567AAA 568 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 569 privp->ethernet_hook = hook; 570 hook->private = &privp->ethernet_hook; 571 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 572 privp->debug_hook = hook; 573 hook->private = &privp->debug_hook; 574 } else { 575 /* 576 * Any other unique name is OK. 577 * The infrastructure has already checked that it's unique, 578 * so just allocate it and hook it in. 579 */ 580 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO); 581 if (sp == NULL) { 582 return (ENOMEM); 583 } 584 585 hook->private = sp; 586 sp->hook = hook; 587 } 588 return(0); 589} 590 591/* 592 * Get a netgraph control message. 593 * Check it is one we understand. If needed, send a response. 594 * We sometimes save the address for an async action later. 595 * Always free the message. 596 */ 597static int 598ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 599{ 600 priv_p privp = node->private; 601 struct ngpppoe_init_data *ourmsg = NULL; 602 struct ng_mesg *resp = NULL; 603 int error = 0; 604 hook_p hook = NULL; 605 sessp sp = NULL; 606 negp neg = NULL; 607 struct ng_mesg *msg; 608 609AAA 610 NGI_GET_MSG(item, msg); 611 /* Deal with message according to cookie and command */ 612 switch (msg->header.typecookie) { 613 case NGM_PPPOE_COOKIE: 614 switch (msg->header.cmd) { 615 case NGM_PPPOE_CONNECT: 616 case NGM_PPPOE_LISTEN: 617 case NGM_PPPOE_OFFER: 618 case NGM_PPPOE_SERVICE: 619 ourmsg = (struct ngpppoe_init_data *)msg->data; 620 if (msg->header.arglen < sizeof(*ourmsg)) { 621 printf("pppoe: init data too small\n"); 622 LEAVE(EMSGSIZE); 623 } 624 if (msg->header.arglen - sizeof(*ourmsg) > 625 PPPOE_SERVICE_NAME_SIZE) { 626 printf("pppoe_rcvmsg: service name too big"); 627 LEAVE(EMSGSIZE); 628 } 629 if (msg->header.arglen - sizeof(*ourmsg) < 630 ourmsg->data_len) { 631 printf("pppoe: init data has bad length," 632 " %d should be %d\n", ourmsg->data_len, 633 msg->header.arglen - sizeof (*ourmsg)); 634 LEAVE(EMSGSIZE); 635 } 636 637 /* make sure strcmp will terminate safely */ 638 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 639 640 /* cycle through all known hooks */ 641 LIST_FOREACH(hook, &node->hooks, hooks) { 642 if (hook->name 643 && strcmp(hook->name, ourmsg->hook) == 0) 644 break; 645 } 646 if (hook == NULL) { 647 LEAVE(ENOENT); 648 } 649 if ((hook->private == &privp->debug_hook) 650 || (hook->private == &privp->ethernet_hook)) { 651 LEAVE(EINVAL); 652 } 653 sp = hook->private; 654 655 /* 656 * PPPOE_SERVICE advertisments are set up 657 * on sessions that are in PRIMED state. 658 */ 659 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 660 break; 661 } 662 if (sp->state |= PPPOE_SNONE) { 663 printf("pppoe: Session already active\n"); 664 LEAVE(EISCONN); 665 } 666 667 /* 668 * set up prototype header 669 */ 670 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, 671 M_NOWAIT | M_ZERO); 672 673 if (neg == NULL) { 674 printf("pppoe: Session out of memory\n"); 675 LEAVE(ENOMEM); 676 } 677 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 678 if(neg->m == NULL) { 679 printf("pppoe: Session out of mbufs\n"); 680 FREE(neg, M_NETGRAPH); 681 LEAVE(ENOBUFS); 682 } 683 neg->m->m_pkthdr.rcvif = NULL; 684 MCLGET(neg->m, M_DONTWAIT); 685 if ((neg->m->m_flags & M_EXT) == 0) { 686 printf("pppoe: Session out of mcls\n"); 687 m_freem(neg->m); 688 FREE(neg, M_NETGRAPH); 689 LEAVE(ENOBUFS); 690 } 691 sp->neg = neg; 692 callout_handle_init( &neg->timeout_handle); 693 neg->m->m_len = sizeof(struct pppoe_full_hdr); 694 neg->pkt = mtod(neg->m, union packet*); 695 neg->pkt->pkt_header.eh = eh_prototype; 696 neg->pkt->pkt_header.ph.ver = 0x1; 697 neg->pkt->pkt_header.ph.type = 0x1; 698 neg->pkt->pkt_header.ph.sid = 0x0000; 699 neg->timeout = 0; 700 701 sp->creator = NGI_RETADDR(item); 702 } 703 switch (msg->header.cmd) { 704 case NGM_PPPOE_GET_STATUS: 705 { 706 struct ngpppoestat *stats; 707 708 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 709 if (!resp) { 710 LEAVE(ENOMEM); 711 } 712 stats = (struct ngpppoestat *) resp->data; 713 stats->packets_in = privp->packets_in; 714 stats->packets_out = privp->packets_out; 715 break; 716 } 717 case NGM_PPPOE_CONNECT: 718 /* 719 * Check the hook exists and is Uninitialised. 720 * Send a PADI request, and start the timeout logic. 721 * Store the originator of this message so we can send 722 * a success of fail message to them later. 723 * Move the session to SINIT 724 * Set up the session to the correct state and 725 * start it. 726 */ 727 neg->service.hdr.tag_type = PTT_SRV_NAME; 728 neg->service.hdr.tag_len = 729 htons((u_int16_t)ourmsg->data_len); 730 if (ourmsg->data_len) 731 bcopy(ourmsg->data, neg->service.data, 732 ourmsg->data_len); 733 neg->service_len = ourmsg->data_len; 734 pppoe_start(sp); 735 break; 736 case NGM_PPPOE_LISTEN: 737 /* 738 * Check the hook exists and is Uninitialised. 739 * Install the service matching string. 740 * Store the originator of this message so we can send 741 * a success of fail message to them later. 742 * Move the hook to 'LISTENING' 743 */ 744 neg->service.hdr.tag_type = PTT_SRV_NAME; 745 neg->service.hdr.tag_len = 746 htons((u_int16_t)ourmsg->data_len); 747 748 if (ourmsg->data_len) 749 bcopy(ourmsg->data, neg->service.data, 750 ourmsg->data_len); 751 neg->service_len = ourmsg->data_len; 752 neg->pkt->pkt_header.ph.code = PADT_CODE; 753 /* 754 * wait for PADI packet coming from ethernet 755 */ 756 sp->state = PPPOE_LISTENING; 757 break; 758 case NGM_PPPOE_OFFER: 759 /* 760 * Check the hook exists and is Uninitialised. 761 * Store the originator of this message so we can send 762 * a success of fail message to them later. 763 * Store the AC-Name given and go to PRIMED. 764 */ 765 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 766 neg->ac_name.hdr.tag_len = 767 htons((u_int16_t)ourmsg->data_len); 768 if (ourmsg->data_len) 769 bcopy(ourmsg->data, neg->ac_name.data, 770 ourmsg->data_len); 771 neg->ac_name_len = ourmsg->data_len; 772 neg->pkt->pkt_header.ph.code = PADO_CODE; 773 /* 774 * Wait for PADI packet coming from hook 775 */ 776 sp->state = PPPOE_PRIMED; 777 break; 778 case NGM_PPPOE_SERVICE: 779 /* 780 * Check the session is primed. 781 * for now just allow ONE service to be advertised. 782 * If you do it twice you just overwrite. 783 */ 784 if (sp->state != PPPOE_PRIMED) { 785 printf("pppoe: Session not primed\n"); 786 LEAVE(EISCONN); 787 } 788 neg->service.hdr.tag_type = PTT_SRV_NAME; 789 neg->service.hdr.tag_len = 790 htons((u_int16_t)ourmsg->data_len); 791 792 if (ourmsg->data_len) 793 bcopy(ourmsg->data, neg->service.data, 794 ourmsg->data_len); 795 neg->service_len = ourmsg->data_len; 796 break; 797 default: 798 LEAVE(EINVAL); 799 } 800 break; 801 default: 802 LEAVE(EINVAL); 803 } 804 805 /* Take care of synchronous response, if any */ 806quit: 807 NG_RESPOND_MSG(error, node, item, resp); 808 /* Free the message and return */ 809 NG_FREE_MSG(msg); 810 return(error); 811} 812 813/* 814 * Start a client into the first state. A separate function because 815 * it can be needed if the negotiation times out. 816 */ 817static void 818pppoe_start(sessp sp) 819{ 820 struct { 821 struct pppoe_tag hdr; 822 union uniq data; 823 } uniqtag; 824 825 /* 826 * kick the state machine into starting up 827 */ 828AAA 829 sp->state = PPPOE_SINIT; 830 /* reset the packet header to broadcast */ 831 sp->neg->pkt->pkt_header.eh = eh_prototype; 832 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 833 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 834 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 835 uniqtag.data.pointer = sp; 836 init_tags(sp); 837 insert_tag(sp, &uniqtag.hdr); 838 insert_tag(sp, &sp->neg->service.hdr); 839 make_packet(sp); 840 sendpacket(sp); 841} 842 843/* 844 * Receive data, and do something with it. 845 * The caller will never free m or meta, so 846 * if we use up this data or abort we must free BOTH of these. 847 */ 848static int 849ng_pppoe_rcvdata(hook_p hook, item_p item) 850{ 851 node_p node = hook->node; 852 const priv_p privp = node->private; 853 sessp sp = hook->private; 854 struct pppoe_full_hdr *wh; 855 struct pppoe_hdr *ph; 856 int error = 0; 857 u_int16_t session; 858 u_int16_t length; 859 u_int8_t code; 860 struct pppoe_tag *utag = NULL, *tag = NULL; 861 hook_p sendhook; 862 struct { 863 struct pppoe_tag hdr; 864 union uniq data; 865 } uniqtag; 866 negp neg = NULL; 867 struct mbuf *m; 868 869AAA 870 NGI_GET_M(item, m); 871 if (hook->private == &privp->debug_hook) { 872 /* 873 * Data from the debug hook gets sent without modification 874 * straight to the ethernet. 875 */ 876 NG_FWD_DATA( error, item, privp->ethernet_hook); 877 privp->packets_out++; 878 } else if (hook->private == &privp->ethernet_hook) { 879 /* 880 * Incoming data. 881 * Dig out various fields from the packet. 882 * use them to decide where to send it. 883 */ 884 885 privp->packets_in++; 886 if( m->m_len < sizeof(*wh)) { 887 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 888 if (m == NULL) { 889 printf("couldn't m_pullup\n"); 890 LEAVE(ENOBUFS); 891 } 892 } 893 wh = mtod(m, struct pppoe_full_hdr *); 894 length = ntohs(wh->ph.length); 895 switch(wh->eh.ether_type) { 896 case ETHERTYPE_PPPOE_DISC: 897 /* 898 * We need to try to make sure that the tag area 899 * is contiguous, or we could wander off the end 900 * of a buffer and make a mess. 901 * (Linux wouldn't have this problem). 902 */ 903 if (m->m_pkthdr.len <= MHLEN) { 904 if( m->m_len < m->m_pkthdr.len) { 905 m = m_pullup(m, m->m_pkthdr.len); 906 if (m == NULL) { 907 printf("couldn't m_pullup\n"); 908 LEAVE(ENOBUFS); 909 } 910 } 911 } 912 if (m->m_len != m->m_pkthdr.len) { 913 /* 914 * It's not all in one piece. 915 * We need to do extra work. 916 * Put it into a cluster. 917 */ 918 struct mbuf *n; 919 n = m_dup(m, M_DONTWAIT); 920 m_freem(m); 921 m = n; 922 if (m) { 923 /* just check we got a cluster */ 924 if (m->m_len != m->m_pkthdr.len) { 925 m_freem(m); 926 m = NULL; 927 } 928 } 929 if (m == NULL) { 930 printf("packet fragmented\n"); 931 LEAVE(EMSGSIZE); 932 } 933 } 934 wh = mtod(m, struct pppoe_full_hdr *); 935 length = ntohs(wh->ph.length); 936 ph = &wh->ph; 937 session = ntohs(wh->ph.sid); 938 code = wh->ph.code; 939 940 switch(code) { 941 case PADI_CODE: 942 /* 943 * We are a server: 944 * Look for a hook with the required service 945 * and send the ENTIRE packet up there. 946 * It should come back to a new hook in 947 * PRIMED state. Look there for further 948 * processing. 949 */ 950 tag = get_tag(ph, PTT_SRV_NAME); 951 if (tag == NULL) { 952 printf("no service tag\n"); 953 LEAVE(ENETUNREACH); 954 } 955 sendhook = pppoe_match_svc(hook->node, 956 tag->tag_data, ntohs(tag->tag_len)); 957 if (sendhook) { 958 NG_FWD_NEW_DATA(error, item, 959 sendhook, m); 960 } else { 961 printf("no such service\n"); 962 LEAVE(ENETUNREACH); 963 } 964 break; 965 case PADO_CODE: 966 /* 967 * We are a client: 968 * Use the host_uniq tag to find the 969 * hook this is in response to. 970 * Received #2, now send #3 971 * For now simply accept the first we receive. 972 */ 973 utag = get_tag(ph, PTT_HOST_UNIQ); 974 if ((utag == NULL) 975 || (ntohs(utag->tag_len) != sizeof(sp))) { 976 printf("no host unique field\n"); 977 LEAVE(ENETUNREACH); 978 } 979 980 sendhook = pppoe_finduniq(node, utag); 981 if (sendhook == NULL) { 982 printf("no matching session\n"); 983 LEAVE(ENETUNREACH); 984 } 985 986 /* 987 * Check the session is in the right state. 988 * It needs to be in PPPOE_SINIT. 989 */ 990 sp = sendhook->private; 991 if (sp->state != PPPOE_SINIT) { 992 printf("session in wrong state\n"); 993 LEAVE(ENETUNREACH); 994 } 995 neg = sp->neg; 996 untimeout(pppoe_ticker, sendhook, 997 neg->timeout_handle); 998 999 /* 1000 * This is the first time we hear 1001 * from the server, so note it's 1002 * unicast address, replacing the 1003 * broadcast address . 1004 */ 1005 bcopy(wh->eh.ether_shost, 1006 neg->pkt->pkt_header.eh.ether_dhost, 1007 ETHER_ADDR_LEN); 1008 neg->timeout = 0; 1009 neg->pkt->pkt_header.ph.code = PADR_CODE; 1010 init_tags(sp); 1011 insert_tag(sp, utag); /* Host Unique */ 1012 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1013 insert_tag(sp, tag); /* return cookie */ 1014 if ((tag = get_tag(ph, PTT_AC_NAME))) 1015 insert_tag(sp, tag); /* return it */ 1016 insert_tag(sp, &neg->service.hdr); /* Service */ 1017 scan_tags(sp, ph); 1018 make_packet(sp); 1019 sp->state = PPPOE_SREQ; 1020 sendpacket(sp); 1021 break; 1022 case PADR_CODE: 1023 1024 /* 1025 * We are a server: 1026 * Use the ac_cookie tag to find the 1027 * hook this is in response to. 1028 */ 1029 utag = get_tag(ph, PTT_AC_COOKIE); 1030 if ((utag == NULL) 1031 || (ntohs(utag->tag_len) != sizeof(sp))) { 1032 LEAVE(ENETUNREACH); 1033 } 1034 1035 sendhook = pppoe_finduniq(node, utag); 1036 if (sendhook == NULL) { 1037 LEAVE(ENETUNREACH); 1038 } 1039 1040 /* 1041 * Check the session is in the right state. 1042 * It needs to be in PPPOE_SOFFER 1043 * or PPPOE_NEWCONNECTED. If the latter, 1044 * then this is a retry by the client. 1045 * so be nice, and resend. 1046 */ 1047 sp = sendhook->private; 1048 if (sp->state == PPPOE_NEWCONNECTED) { 1049 /* 1050 * Whoa! drop back to resend that 1051 * PADS packet. 1052 * We should still have a copy of it. 1053 */ 1054 sp->state = PPPOE_SOFFER; 1055 } 1056 if (sp->state != PPPOE_SOFFER) { 1057 LEAVE (ENETUNREACH); 1058 break; 1059 } 1060 neg = sp->neg; 1061 untimeout(pppoe_ticker, sendhook, 1062 neg->timeout_handle); 1063 neg->pkt->pkt_header.ph.code = PADS_CODE; 1064 if (sp->Session_ID == 0) 1065 neg->pkt->pkt_header.ph.sid = 1066 htons(sp->Session_ID 1067 = get_new_sid(node)); 1068 neg->timeout = 0; 1069 /* 1070 * start working out the tags to respond with. 1071 */ 1072 init_tags(sp); 1073 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1074 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1075 insert_tag(sp, tag);/* return service */ 1076 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1077 insert_tag(sp, tag); /* return it */ 1078 insert_tag(sp, utag); /* ac_cookie */ 1079 scan_tags(sp, ph); 1080 make_packet(sp); 1081 sp->state = PPPOE_NEWCONNECTED; 1082 sendpacket(sp); 1083 /* 1084 * Having sent the last Negotiation header, 1085 * Set up the stored packet header to 1086 * be correct for the actual session. 1087 * But keep the negotialtion stuff 1088 * around in case we need to resend this last 1089 * packet. We'll discard it when we move 1090 * from NEWCONNECTED to CONNECTED 1091 */ 1092 sp->pkt_hdr = neg->pkt->pkt_header; 1093 sp->pkt_hdr.eh.ether_type 1094 = ETHERTYPE_PPPOE_SESS; 1095 sp->pkt_hdr.ph.code = 0; 1096 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1097 break; 1098 case PADS_CODE: 1099 /* 1100 * We are a client: 1101 * Use the host_uniq tag to find the 1102 * hook this is in response to. 1103 * take the session ID and store it away. 1104 * Also make sure the pre-made header is 1105 * correct and set us into Session mode. 1106 */ 1107 utag = get_tag(ph, PTT_HOST_UNIQ); 1108 if ((utag == NULL) 1109 || (ntohs(utag->tag_len) != sizeof(sp))) { 1110 LEAVE (ENETUNREACH); 1111 break; 1112 } 1113 sendhook = pppoe_finduniq(node, utag); 1114 if (sendhook == NULL) { 1115 LEAVE(ENETUNREACH); 1116 } 1117 1118 /* 1119 * Check the session is in the right state. 1120 * It needs to be in PPPOE_SREQ. 1121 */ 1122 sp = sendhook->private; 1123 if (sp->state != PPPOE_SREQ) { 1124 LEAVE(ENETUNREACH); 1125 } 1126 neg = sp->neg; 1127 untimeout(pppoe_ticker, sendhook, 1128 neg->timeout_handle); 1129 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1130 sp->Session_ID = ntohs(wh->ph.sid); 1131 neg->timeout = 0; 1132 sp->state = PPPOE_CONNECTED; 1133 /* 1134 * Now we have gone to Connected mode, 1135 * Free all resources needed for 1136 * negotiation. 1137 * Keep a copy of the header we will be using. 1138 */ 1139 sp->pkt_hdr = neg->pkt->pkt_header; 1140 sp->pkt_hdr.eh.ether_type 1141 = ETHERTYPE_PPPOE_SESS; 1142 sp->pkt_hdr.ph.code = 0; 1143 m_freem(neg->m); 1144 FREE(sp->neg, M_NETGRAPH); 1145 sp->neg = NULL; 1146 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1147 break; 1148 case PADT_CODE: 1149 /* 1150 * Send a 'close' message to the controlling 1151 * process (the one that set us up); 1152 * And then tear everything down. 1153 * 1154 * Find matching peer/session combination. 1155 */ 1156 sendhook = pppoe_findsession(node, wh); 1157 if (sendhook == NULL) { 1158 LEAVE(ENETUNREACH); 1159 } 1160 /* send message to creator */ 1161 /* close hook */ 1162 if (sendhook) { 1163 ng_destroy_hook(sendhook); 1164 } 1165 break; 1166 default: 1167 LEAVE(EPFNOSUPPORT); 1168 } 1169 break; 1170 case ETHERTYPE_PPPOE_SESS: 1171 /* 1172 * find matching peer/session combination. 1173 */ 1174 sendhook = pppoe_findsession(node, wh); 1175 if (sendhook == NULL) { 1176 LEAVE (ENETUNREACH); 1177 break; 1178 } 1179 sp = sendhook->private; 1180 m_adj(m, sizeof(*wh)); 1181 if (m->m_pkthdr.len < length) { 1182 /* Packet too short, dump it */ 1183 LEAVE(EMSGSIZE); 1184 } 1185 1186 /* Also need to trim excess at the end */ 1187 if (m->m_pkthdr.len > length) { 1188 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1189 } 1190 if ( sp->state != PPPOE_CONNECTED) { 1191 if (sp->state == PPPOE_NEWCONNECTED) { 1192 sp->state = PPPOE_CONNECTED; 1193 /* 1194 * Now we have gone to Connected mode, 1195 * Free all resources needed for 1196 * negotiation. Be paranoid about 1197 * whether there may be a timeout. 1198 */ 1199 m_freem(sp->neg->m); 1200 untimeout(pppoe_ticker, sendhook, 1201 sp->neg->timeout_handle); 1202 FREE(sp->neg, M_NETGRAPH); 1203 sp->neg = NULL; 1204 } else { 1205 LEAVE (ENETUNREACH); 1206 break; 1207 } 1208 } 1209 NG_FWD_NEW_DATA( error, item, sendhook, m); 1210 break; 1211 default: 1212 LEAVE(EPFNOSUPPORT); 1213 } 1214 } else { 1215 /* 1216 * Not ethernet or debug hook.. 1217 * 1218 * The packet has come in on a normal hook. 1219 * We need to find out what kind of hook, 1220 * So we can decide how to handle it. 1221 * Check the hook's state. 1222 */ 1223 sp = hook->private; 1224 switch (sp->state) { 1225 case PPPOE_NEWCONNECTED: 1226 case PPPOE_CONNECTED: { 1227 static const u_char addrctrl[] = { 0xff, 0x03 }; 1228 struct pppoe_full_hdr *wh; 1229 1230 /* 1231 * Remove PPP address and control fields, if any. 1232 * For example, ng_ppp(4) always sends LCP packets 1233 * with address and control fields as required by 1234 * generic PPP. PPPoE is an exception to the rule. 1235 */ 1236 if (m->m_pkthdr.len >= 2) { 1237 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1238 LEAVE(ENOBUFS); 1239 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1240 m_adj(m, 2); 1241 } 1242 /* 1243 * Bang in a pre-made header, and set the length up 1244 * to be correct. Then send it to the ethernet driver. 1245 * But first correct the length. 1246 */ 1247 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1248 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1249 if (m == NULL) { 1250 LEAVE(ENOBUFS); 1251 } 1252 wh = mtod(m, struct pppoe_full_hdr *); 1253 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1254 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1255 privp->packets_out++; 1256 break; 1257 } 1258 case PPPOE_PRIMED: 1259 /* 1260 * A PADI packet is being returned by the application 1261 * that has set up this hook. This indicates that it 1262 * wants us to offer service. 1263 */ 1264 neg = sp->neg; 1265 if (m->m_len < sizeof(*wh)) { 1266 m = m_pullup(m, sizeof(*wh)); 1267 if (m == NULL) { 1268 LEAVE(ENOBUFS); 1269 } 1270 } 1271 wh = mtod(m, struct pppoe_full_hdr *); 1272 ph = &wh->ph; 1273 session = ntohs(wh->ph.sid); 1274 length = ntohs(wh->ph.length); 1275 code = wh->ph.code; 1276 if ( code != PADI_CODE) { 1277 LEAVE(EINVAL); 1278 }; 1279 untimeout(pppoe_ticker, hook, 1280 neg->timeout_handle); 1281 1282 /* 1283 * This is the first time we hear 1284 * from the client, so note it's 1285 * unicast address, replacing the 1286 * broadcast address. 1287 */ 1288 bcopy(wh->eh.ether_shost, 1289 neg->pkt->pkt_header.eh.ether_dhost, 1290 ETHER_ADDR_LEN); 1291 sp->state = PPPOE_SOFFER; 1292 neg->timeout = 0; 1293 neg->pkt->pkt_header.ph.code = PADO_CODE; 1294 1295 /* 1296 * start working out the tags to respond with. 1297 */ 1298 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1299 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1300 uniqtag.data.pointer = sp; 1301 init_tags(sp); 1302 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1303 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1304 insert_tag(sp, tag); /* return service */ 1305 /* 1306 * If we have a NULL service request 1307 * and have an extra service defined in this hook, 1308 * then also add a tag for the extra service. 1309 * XXX this is a hack. eventually we should be able 1310 * to support advertising many services, not just one 1311 */ 1312 if (((tag == NULL) || (tag->tag_len == 0)) 1313 && (neg->service.hdr.tag_len != 0)) { 1314 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1315 } 1316 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1317 insert_tag(sp, tag); /* returned hostunique */ 1318 insert_tag(sp, &uniqtag.hdr); 1319 scan_tags(sp, ph); 1320 make_packet(sp); 1321 sendpacket(sp); 1322 break; 1323 1324 /* 1325 * Packets coming from the hook make no sense 1326 * to sessions in these states. Throw them away. 1327 */ 1328 case PPPOE_SINIT: 1329 case PPPOE_SREQ: 1330 case PPPOE_SOFFER: 1331 case PPPOE_SNONE: 1332 case PPPOE_LISTENING: 1333 case PPPOE_DEAD: 1334 default: 1335 LEAVE(ENETUNREACH); 1336 } 1337 } 1338quit: 1339 NG_FREE_ITEM(item); 1340 NG_FREE_M(m); 1341 return error; 1342} 1343 1344/* 1345 * Do local shutdown processing.. 1346 * If we are a persistant device, we might refuse to go away, and 1347 * we'd only remove our links and reset ourself. 1348 */ 1349static int 1350ng_pppoe_shutdown(node_p node) 1351{ 1352 const priv_p privdata = node->private; 1353 1354AAA 1355 node->flags |= NG_INVALID; 1356 node->private = NULL; 1357 ng_unref(privdata->node); 1358 FREE(privdata, M_NETGRAPH); 1359 return (0); 1360} 1361 1362/* 1363 * This is called once we've already connected a new hook to the other node. 1364 * It gives us a chance to balk at the last minute. 1365 */ 1366static int 1367ng_pppoe_connect(hook_p hook) 1368{ 1369 /* be really amiable and just say "YUP that's OK by me! " */ 1370 return (0); 1371} 1372 1373/* 1374 * Hook disconnection 1375 * 1376 * Clean up all dangling links and information about the session/hook. 1377 * For this type, removal of the last link destroys the node 1378 */ 1379static int 1380ng_pppoe_disconnect(hook_p hook) 1381{ 1382 node_p node = hook->node; 1383 priv_p privp = node->private; 1384 sessp sp; 1385 int hooks; 1386 1387AAA 1388 hooks = node->numhooks; /* this one already not counted */ 1389 if (hook->private == &privp->debug_hook) { 1390 privp->debug_hook = NULL; 1391 } else if (hook->private == &privp->ethernet_hook) { 1392 privp->ethernet_hook = NULL; 1393 if ((node->flags & NG_INVALID) == 0) 1394 ng_rmnode_self(node); 1395 } else { 1396 sp = hook->private; 1397 if (sp->state != PPPOE_SNONE ) { 1398 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1399 } 1400 /* 1401 * According to the spec, if we are connected, 1402 * we should send a DISC packet if we are shutting down 1403 * a session. 1404 */ 1405 if ((privp->ethernet_hook) 1406 && ((sp->state == PPPOE_CONNECTED) 1407 || (sp->state == PPPOE_NEWCONNECTED))) { 1408 struct mbuf *m; 1409 struct pppoe_full_hdr *wh; 1410 struct pppoe_tag *tag; 1411 int msglen = strlen(SIGNOFF); 1412 int error = 0; 1413 1414 /* revert the stored header to DISC/PADT mode */ 1415 wh = &sp->pkt_hdr; 1416 wh->ph.code = PADT_CODE; 1417 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1418 1419 /* generate a packet of that type */ 1420 MGETHDR(m, M_DONTWAIT, MT_DATA); 1421 if(m == NULL) 1422 printf("pppoe: Session out of mbufs\n"); 1423 else { 1424 m->m_pkthdr.rcvif = NULL; 1425 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1426 bcopy((caddr_t)wh, mtod(m, caddr_t), 1427 sizeof(*wh)); 1428 /* 1429 * Add a General error message and adjust 1430 * sizes 1431 */ 1432 wh = mtod(m, struct pppoe_full_hdr *); 1433 tag = wh->ph.tag; 1434 tag->tag_type = PTT_GEN_ERR; 1435 tag->tag_len = htons((u_int16_t)msglen); 1436 strncpy(tag->tag_data, SIGNOFF, msglen); 1437 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1438 msglen); 1439 wh->ph.length = htons(sizeof(*tag) + msglen); 1440 NG_SEND_DATA_ONLY(error, 1441 privp->ethernet_hook, m); 1442 } 1443 } 1444 /* 1445 * As long as we have somewhere to store the timeout handle, 1446 * we may have a timeout pending.. get rid of it. 1447 */ 1448 if (sp->neg) { 1449 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1450 if (sp->neg->m) 1451 m_freem(sp->neg->m); 1452 FREE(sp->neg, M_NETGRAPH); 1453 } 1454 FREE(sp, M_NETGRAPH); 1455 hook->private = NULL; 1456 /* work out how many session hooks there are */ 1457 /* Node goes away on last session hook removal */ 1458 if (privp->ethernet_hook) hooks -= 1; 1459 if (privp->debug_hook) hooks -= 1; 1460 } 1461 if ((node->numhooks == 0) 1462 && ((node->flags & NG_INVALID) == 0)) 1463 ng_rmnode_self(node); 1464 return (0); 1465} 1466 1467/* 1468 * timeouts come here. 1469 */ 1470static void 1471pppoe_ticker(void *arg) 1472{ 1473 int s = splnet(); 1474 hook_p hook = arg; 1475 sessp sp = hook->private; 1476 negp neg = sp->neg; 1477 int error = 0; 1478 struct mbuf *m0 = NULL; 1479 priv_p privp = hook->node->private; 1480 1481AAA 1482 switch(sp->state) { 1483 /* 1484 * resend the last packet, using an exponential backoff. 1485 * After a period of time, stop growing the backoff, 1486 * and either leave it, or revert to the start. 1487 */ 1488 case PPPOE_SINIT: 1489 case PPPOE_SREQ: 1490 /* timeouts on these produce resends */ 1491 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1492 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1493 neg->timeout_handle = timeout(pppoe_ticker, 1494 hook, neg->timeout * hz); 1495 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1496 if (sp->state == PPPOE_SREQ) { 1497 /* revert to SINIT mode */ 1498 pppoe_start(sp); 1499 } else { 1500 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1501 } 1502 } 1503 break; 1504 case PPPOE_PRIMED: 1505 case PPPOE_SOFFER: 1506 /* a timeout on these says "give up" */ 1507 ng_destroy_hook(hook); 1508 break; 1509 default: 1510 /* timeouts have no meaning in other states */ 1511 printf("pppoe: unexpected timeout\n"); 1512 } 1513 splx(s); 1514} 1515 1516 1517static void 1518sendpacket(sessp sp) 1519{ 1520 int error = 0; 1521 struct mbuf *m0 = NULL; 1522 hook_p hook = sp->hook; 1523 negp neg = sp->neg; 1524 priv_p privp = hook->node->private; 1525 1526AAA 1527 switch(sp->state) { 1528 case PPPOE_LISTENING: 1529 case PPPOE_DEAD: 1530 case PPPOE_SNONE: 1531 case PPPOE_CONNECTED: 1532 printf("pppoe: sendpacket: unexpected state\n"); 1533 break; 1534 1535 case PPPOE_NEWCONNECTED: 1536 /* send the PADS without a timeout - we're now connected */ 1537 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1538 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1539 break; 1540 1541 case PPPOE_PRIMED: 1542 /* No packet to send, but set up the timeout */ 1543 neg->timeout_handle = timeout(pppoe_ticker, 1544 hook, PPPOE_OFFER_TIMEOUT * hz); 1545 break; 1546 1547 case PPPOE_SOFFER: 1548 /* 1549 * send the offer but if they don't respond 1550 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1551 */ 1552 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1553 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1554 neg->timeout_handle = timeout(pppoe_ticker, 1555 hook, PPPOE_OFFER_TIMEOUT * hz); 1556 break; 1557 1558 case PPPOE_SINIT: 1559 case PPPOE_SREQ: 1560 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1561 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1562 neg->timeout_handle = timeout(pppoe_ticker, hook, 1563 (hz * PPPOE_INITIAL_TIMEOUT)); 1564 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1565 break; 1566 1567 default: 1568 error = EINVAL; 1569 printf("pppoe: timeout: bad state\n"); 1570 } 1571 /* return (error); */ 1572} 1573 1574/* 1575 * Parse an incoming packet to see if any tags should be copied to the 1576 * output packet. Don't do any tags that have been handled in the main 1577 * state machine. 1578 */ 1579static struct pppoe_tag* 1580scan_tags(sessp sp, struct pppoe_hdr* ph) 1581{ 1582 char *end = (char *)next_tag(ph); 1583 char *ptn; 1584 struct pppoe_tag *pt = &ph->tag[0]; 1585 /* 1586 * Keep processing tags while a tag header will still fit. 1587 */ 1588AAA 1589 while((char*)(pt + 1) <= end) { 1590 /* 1591 * If the tag data would go past the end of the packet, abort. 1592 */ 1593 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1594 if(ptn > end) 1595 return NULL; 1596 1597 switch (pt->tag_type) { 1598 case PTT_RELAY_SID: 1599 insert_tag(sp, pt); 1600 break; 1601 case PTT_EOL: 1602 return NULL; 1603 case PTT_SRV_NAME: 1604 case PTT_AC_NAME: 1605 case PTT_HOST_UNIQ: 1606 case PTT_AC_COOKIE: 1607 case PTT_VENDOR: 1608 case PTT_SRV_ERR: 1609 case PTT_SYS_ERR: 1610 case PTT_GEN_ERR: 1611 break; 1612 } 1613 pt = (struct pppoe_tag*)ptn; 1614 } 1615 return NULL; 1616} 1617 1618static int 1619pppoe_send_event(sessp sp, enum cmd cmdid) 1620{ 1621 int error; 1622 struct ng_mesg *msg; 1623 struct ngpppoe_sts *sts; 1624 1625AAA 1626 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1627 sizeof(struct ngpppoe_sts), M_NOWAIT); 1628 if (msg == NULL) 1629 return (ENOMEM); 1630 sts = (struct ngpppoe_sts *)msg->data; 1631 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1); 1632 NG_SEND_MSG_ID(error, sp->hook->node, msg, sp->creator, NULL); 1633 return (error); 1634} 1635