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sys/netgraph/ng_pppoe.c
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1 2 /* 3 * ng_pppoe.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD: releng/5.3/sys/netgraph/ng_pppoe.c 136588 2004-10-16 08:43:07Z cvs2svn $ 40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41 */ 42 #if 0 43 #define AAA printf("pppoe: %s\n", __func__ ); 44 #define BBB printf("-%d-", __LINE__ ); 45 #else 46 #define AAA 47 #define BBB 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 #include <sys/mbuf.h> 54 #include <sys/malloc.h> 55 #include <sys/errno.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <net/ethernet.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include <netgraph/ng_parse.h> 63 #include <netgraph/ng_pppoe.h> 64 65 #ifdef NG_SEPARATE_MALLOC 66 MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 67 #else 68 #define M_NETGRAPH_PPPOE M_NETGRAPH 69 #endif 70 71 #define SIGNOFF "session closed" 72 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 73 74 /* 75 * This section contains the netgraph method declarations for the 76 * pppoe node. These methods define the netgraph pppoe 'type'. 77 */ 78 79 static ng_constructor_t ng_pppoe_constructor; 80 static ng_rcvmsg_t ng_pppoe_rcvmsg; 81 static ng_shutdown_t ng_pppoe_shutdown; 82 static ng_newhook_t ng_pppoe_newhook; 83 static ng_connect_t ng_pppoe_connect; 84 static ng_rcvdata_t ng_pppoe_rcvdata; 85 static ng_disconnect_t ng_pppoe_disconnect; 86 87 /* Parse type for struct ngpppoe_init_data */ 88 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 89 = NG_PPPOE_INIT_DATA_TYPE_INFO; 90 static const struct ng_parse_type ngpppoe_init_data_state_type = { 91 &ng_parse_struct_type, 92 &ngpppoe_init_data_type_fields 93 }; 94 95 /* Parse type for struct ngpppoe_sts */ 96 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 97 = NG_PPPOE_STS_TYPE_INFO; 98 static const struct ng_parse_type ng_pppoe_sts_state_type = { 99 &ng_parse_struct_type, 100 &ng_pppoe_sts_type_fields 101 }; 102 103 /* List of commands and how to convert arguments to/from ASCII */ 104 static const struct ng_cmdlist ng_pppoe_cmds[] = { 105 { 106 NGM_PPPOE_COOKIE, 107 NGM_PPPOE_CONNECT, 108 "pppoe_connect", 109 &ngpppoe_init_data_state_type, 110 NULL 111 }, 112 { 113 NGM_PPPOE_COOKIE, 114 NGM_PPPOE_LISTEN, 115 "pppoe_listen", 116 &ngpppoe_init_data_state_type, 117 NULL 118 }, 119 { 120 NGM_PPPOE_COOKIE, 121 NGM_PPPOE_OFFER, 122 "pppoe_offer", 123 &ngpppoe_init_data_state_type, 124 NULL 125 }, 126 { 127 NGM_PPPOE_COOKIE, 128 NGM_PPPOE_SERVICE, 129 "pppoe_service", 130 &ngpppoe_init_data_state_type, 131 NULL 132 }, 133 { 134 NGM_PPPOE_COOKIE, 135 NGM_PPPOE_SUCCESS, 136 "pppoe_success", 137 &ng_pppoe_sts_state_type, 138 NULL 139 }, 140 { 141 NGM_PPPOE_COOKIE, 142 NGM_PPPOE_FAIL, 143 "pppoe_fail", 144 &ng_pppoe_sts_state_type, 145 NULL 146 }, 147 { 148 NGM_PPPOE_COOKIE, 149 NGM_PPPOE_CLOSE, 150 "pppoe_close", 151 &ng_pppoe_sts_state_type, 152 NULL 153 }, 154 { 155 NGM_PPPOE_COOKIE, 156 NGM_PPPOE_SETMODE, 157 "pppoe_setmode", 158 &ng_parse_string_type, 159 NULL 160 }, 161 { 162 NGM_PPPOE_COOKIE, 163 NGM_PPPOE_GETMODE, 164 "pppoe_getmode", 165 NULL, 166 &ng_parse_string_type 167 }, 168 { 0 } 169 }; 170 171 /* Netgraph node type descriptor */ 172 static struct ng_type typestruct = { 173 .version = NG_ABI_VERSION, 174 .name = NG_PPPOE_NODE_TYPE, 175 .constructor = ng_pppoe_constructor, 176 .rcvmsg = ng_pppoe_rcvmsg, 177 .shutdown = ng_pppoe_shutdown, 178 .newhook = ng_pppoe_newhook, 179 .connect = ng_pppoe_connect, 180 .rcvdata = ng_pppoe_rcvdata, 181 .disconnect = ng_pppoe_disconnect, 182 .cmdlist = ng_pppoe_cmds, 183 }; 184 NETGRAPH_INIT(pppoe, &typestruct); 185 /* Depend on ng_ether so we can use the Ethernet parse type */ 186 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1); 187 188 /* 189 * States for the session state machine. 190 * These have no meaning if there is no hook attached yet. 191 */ 192 enum state { 193 PPPOE_SNONE=0, /* [both] Initial state */ 194 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 195 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 196 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 197 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 198 PPPOE_SREQ, /* [Client] Sent a Request */ 199 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 200 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 201 PPPOE_DEAD /* [Both] */ 202 }; 203 204 #define NUMTAGS 20 /* number of tags we are set up to work with */ 205 206 /* 207 * Information we store for each hook on each node for negotiating the 208 * session. The mbuf and cluster are freed once negotiation has completed. 209 * The whole negotiation block is then discarded. 210 */ 211 212 struct sess_neg { 213 struct mbuf *m; /* holds cluster with last sent packet */ 214 union packet *pkt; /* points within the above cluster */ 215 struct callout_handle timeout_handle; /* see timeout(9) */ 216 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 217 u_int numtags; 218 const struct pppoe_tag *tags[NUMTAGS]; 219 u_int service_len; 220 u_int ac_name_len; 221 222 struct datatag service; 223 struct datatag ac_name; 224 }; 225 typedef struct sess_neg *negp; 226 227 /* 228 * Session information that is needed after connection. 229 */ 230 struct sess_con { 231 hook_p hook; 232 u_int16_t Session_ID; 233 enum state state; 234 ng_ID_t creator; /* who to notify */ 235 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 236 negp neg; /* used when negotiating */ 237 /*struct sess_con *hash_next;*/ /* not yet used */ 238 }; 239 typedef struct sess_con *sessp; 240 241 #define NG_PPPOE_SESSION_NODE(sp) NG_HOOK_NODE(sp->hook) 242 243 enum { 244 PPPOE_STANDARD = 1, /* standard RFC2516 mode */ 245 PPPOE_NONSTANDARD, /* 3Com proprietary mode */ 246 }; 247 248 struct ng_pppoe_mode_t { 249 u_int8_t id; 250 const struct ether_header *eh_prototype; 251 const char *name; 252 }; 253 254 static const struct ether_header eh_standard = 255 {{0xff,0xff,0xff,0xff,0xff,0xff}, 256 {0x00,0x00,0x00,0x00,0x00,0x00}, 257 ETHERTYPE_PPPOE_DISC}; 258 259 static const struct ether_header eh_3Com = 260 {{0xff,0xff,0xff,0xff,0xff,0xff}, 261 {0x00,0x00,0x00,0x00,0x00,0x00}, 262 ETHERTYPE_PPPOE_STUPID_DISC}; 263 264 static const struct ng_pppoe_mode_t ng_pppoe_modes[] = { 265 { PPPOE_STANDARD, &eh_standard, NG_PPPOE_STANDARD }, 266 { PPPOE_NONSTANDARD, &eh_3Com, NG_PPPOE_NONSTANDARD }, 267 { 0, NULL}, 268 }; 269 270 /* 271 * Information we store for each node 272 */ 273 struct PPPOE { 274 node_p node; /* back pointer to node */ 275 hook_p ethernet_hook; 276 hook_p debug_hook; 277 u_int packets_in; /* packets in from ethernet */ 278 u_int packets_out; /* packets out towards ethernet */ 279 u_int32_t flags; 280 const struct ng_pppoe_mode_t *mode; /* standard PPPoE or 3Com? */ 281 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 282 }; 283 typedef struct PPPOE *priv_p; 284 285 /* Deprecated sysctl, leaved here to keep compatibility for some time */ 286 #define PPPOE_SYSCTL_KEEPSTANDARD -1 287 #define PPPOE_SYSCTL_STANDARD 0 288 #define PPPOE_SYSCTL_NONSTANDARD 1 289 static int pppoe_mode = PPPOE_SYSCTL_KEEPSTANDARD; 290 static const struct ng_pppoe_mode_t *sysctl_mode = ng_pppoe_modes; 291 292 static int 293 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS) 294 { 295 int error; 296 int val; 297 298 val = pppoe_mode; 299 error = sysctl_handle_int(oidp, &val, sizeof(int), req); 300 if (error != 0 || req->newptr == NULL) 301 return (error); 302 switch (val) { 303 case PPPOE_SYSCTL_NONSTANDARD: 304 sysctl_mode = ng_pppoe_modes + 1; 305 break; 306 case PPPOE_SYSCTL_STANDARD: 307 case PPPOE_SYSCTL_KEEPSTANDARD: 308 sysctl_mode = ng_pppoe_modes; 309 break; 310 default: 311 return (EINVAL); 312 } 313 314 pppoe_mode = val; 315 printf("net.graph.nonstandard_pppoe is deprecated. See ng_pppoe(4), ppp(8).\n"); 316 return (0); 317 } 318 319 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW, 320 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP"); 321 322 union uniq { 323 char bytes[sizeof(void *)]; 324 void * pointer; 325 }; 326 327 #define LEAVE(x) do { error = x; goto quit; } while(0) 328 static void pppoe_start(sessp sp); 329 static void sendpacket(sessp sp); 330 static void pppoe_ticker(void *arg); 331 static const struct pppoe_tag *scan_tags(sessp sp, 332 const struct pppoe_hdr* ph); 333 static int pppoe_send_event(sessp sp, enum cmd cmdid); 334 335 /************************************************************************* 336 * Some basic utilities from the Linux version with author's permission.* 337 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 338 ************************************************************************/ 339 340 /* 341 * Generate a new session id 342 * XXX find out the FreeBSD locking scheme. 343 */ 344 static u_int16_t 345 get_new_sid(node_p node) 346 { 347 static int pppoe_sid = 10; 348 sessp sp; 349 hook_p hook; 350 u_int16_t val; 351 priv_p privp = NG_NODE_PRIVATE(node); 352 353 AAA 354 restart: 355 val = pppoe_sid++; 356 /* 357 * Spec says 0xFFFF is reserved. 358 * Also don't use 0x0000 359 */ 360 if (val == 0xffff) { 361 pppoe_sid = 20; 362 goto restart; 363 } 364 365 /* Check it isn't already in use */ 366 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 367 /* don't check special hooks */ 368 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 369 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 370 continue; 371 sp = NG_HOOK_PRIVATE(hook); 372 if (sp->Session_ID == val) 373 goto restart; 374 } 375 376 return val; 377 } 378 379 380 /* 381 * Return the location where the next tag can be put 382 */ 383 static __inline const struct pppoe_tag* 384 next_tag(const struct pppoe_hdr* ph) 385 { 386 return (const struct pppoe_tag*)(((const char*)&ph->tag[0]) 387 + ntohs(ph->length)); 388 } 389 390 /* 391 * Look for a tag of a specific type 392 * Don't trust any length the other end says. 393 * but assume we already sanity checked ph->length. 394 */ 395 static const struct pppoe_tag* 396 get_tag(const struct pppoe_hdr* ph, u_int16_t idx) 397 { 398 const char *const end = (const char *)next_tag(ph); 399 const char *ptn; 400 const struct pppoe_tag *pt = &ph->tag[0]; 401 /* 402 * Keep processing tags while a tag header will still fit. 403 */ 404 AAA 405 while((const char*)(pt + 1) <= end) { 406 /* 407 * If the tag data would go past the end of the packet, abort. 408 */ 409 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 410 if(ptn > end) 411 return NULL; 412 413 if(pt->tag_type == idx) 414 return pt; 415 416 pt = (const struct pppoe_tag*)ptn; 417 } 418 return NULL; 419 } 420 421 /************************************************************************** 422 * inlines to initialise or add tags to a session's tag list, 423 **************************************************************************/ 424 /* 425 * Initialise the session's tag list 426 */ 427 static void 428 init_tags(sessp sp) 429 { 430 AAA 431 if(sp->neg == NULL) { 432 printf("pppoe: asked to init NULL neg pointer\n"); 433 return; 434 } 435 sp->neg->numtags = 0; 436 } 437 438 static void 439 insert_tag(sessp sp, const struct pppoe_tag *tp) 440 { 441 int i; 442 negp neg; 443 444 AAA 445 if((neg = sp->neg) == NULL) { 446 printf("pppoe: asked to use NULL neg pointer\n"); 447 return; 448 } 449 if ((i = neg->numtags++) < NUMTAGS) { 450 neg->tags[i] = tp; 451 } else { 452 printf("pppoe: asked to add too many tags to packet\n"); 453 neg->numtags--; 454 } 455 } 456 457 /* 458 * Make up a packet, using the tags filled out for the session. 459 * 460 * Assume that the actual pppoe header and ethernet header 461 * are filled out externally to this routine. 462 * Also assume that neg->wh points to the correct 463 * location at the front of the buffer space. 464 */ 465 static void 466 make_packet(sessp sp) { 467 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 468 const struct pppoe_tag **tag; 469 char *dp; 470 int count; 471 int tlen; 472 u_int16_t length = 0; 473 474 AAA 475 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 476 printf("pppoe: make_packet called from wrong state\n"); 477 } 478 dp = (char *)wh->ph.tag; 479 for (count = 0, tag = sp->neg->tags; 480 ((count < sp->neg->numtags) && (count < NUMTAGS)); 481 tag++, count++) { 482 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 483 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 484 printf("pppoe: tags too long\n"); 485 sp->neg->numtags = count; 486 break; /* XXX chop off what's too long */ 487 } 488 bcopy(*tag, (char *)dp, tlen); 489 length += tlen; 490 dp += tlen; 491 } 492 wh->ph.length = htons(length); 493 sp->neg->m->m_len = length + sizeof(*wh); 494 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 495 } 496 497 /************************************************************************** 498 * Routine to match a service offered * 499 **************************************************************************/ 500 /* 501 * Find a hook that has a service string that matches that 502 * we are seeking. for now use a simple string. 503 * In the future we may need something like regexp(). 504 * for testing allow a null string to match 1st found and a null service 505 * to match all requests. Also make '*' do the same. 506 */ 507 508 #define NG_MATCH_EXACT 1 509 #define NG_MATCH_ANY 2 510 511 static hook_p 512 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match) 513 { 514 sessp sp = NULL; 515 negp neg = NULL; 516 priv_p privp = NG_NODE_PRIVATE(node); 517 hook_p allhook = NULL; 518 hook_p hook; 519 520 AAA 521 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 522 523 /* skip any hook that is debug or ethernet */ 524 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 525 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 526 continue; 527 sp = NG_HOOK_PRIVATE(hook); 528 529 /* Skip any sessions which are not in LISTEN mode. */ 530 if ( sp->state != PPPOE_LISTENING) 531 continue; 532 533 neg = sp->neg; 534 535 /* Special case for a blank or "*" service name (wildcard) */ 536 if (match == NG_MATCH_ANY && neg->service_len == 1 && 537 neg->service.data[0] == '*') { 538 allhook = hook; 539 continue; 540 } 541 542 /* If the lengths don't match, that aint it. */ 543 if (neg->service_len != svc_len) 544 continue; 545 546 /* An exact match? */ 547 if (svc_len == 0) 548 break; 549 550 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 551 break; 552 } 553 return (hook ? hook : allhook); 554 } 555 /************************************************************************** 556 * Routine to find a particular session that matches an incoming packet * 557 **************************************************************************/ 558 static hook_p 559 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh) 560 { 561 sessp sp = NULL; 562 hook_p hook = NULL; 563 priv_p privp = NG_NODE_PRIVATE(node); 564 u_int16_t session = ntohs(wh->ph.sid); 565 566 /* 567 * find matching peer/session combination. 568 */ 569 AAA 570 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 571 /* don't check special hooks */ 572 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 573 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 574 continue; 575 } 576 sp = NG_HOOK_PRIVATE(hook); 577 if ( ( (sp->state == PPPOE_CONNECTED) 578 || (sp->state == PPPOE_NEWCONNECTED) ) 579 && (sp->Session_ID == session) 580 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 581 wh->eh.ether_shost, 582 ETHER_ADDR_LEN)) == 0) { 583 break; 584 } 585 } 586 return (hook); 587 } 588 589 static hook_p 590 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 591 { 592 hook_p hook = NULL; 593 priv_p privp = NG_NODE_PRIVATE(node); 594 union uniq uniq; 595 596 AAA 597 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 598 /* cycle through all known hooks */ 599 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 600 /* don't check special hooks */ 601 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 602 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) 603 continue; 604 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 605 break; 606 } 607 return (hook); 608 } 609 610 /************************************************************************** 611 * start of Netgraph entrypoints * 612 **************************************************************************/ 613 614 /* 615 * Allocate the private data structure and the generic node 616 * and link them together. 617 * 618 * ng_make_node_common() returns with a generic node struct 619 * with a single reference for us.. we transfer it to the 620 * private structure.. when we free the private struct we must 621 * unref the node so it gets freed too. 622 */ 623 static int 624 ng_pppoe_constructor(node_p node) 625 { 626 priv_p privdata; 627 628 AAA 629 /* Initialize private descriptor */ 630 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE, 631 M_NOWAIT | M_ZERO); 632 if (privdata == NULL) 633 return (ENOMEM); 634 635 /* Link structs together; this counts as our one reference to *nodep */ 636 NG_NODE_SET_PRIVATE(node, privdata); 637 privdata->node = node; 638 639 /* Initialize to standard mode (the first one in ng_pppoe_modes[]). */ 640 privdata->mode = sysctl_mode; 641 642 return (0); 643 } 644 645 /* 646 * Give our ok for a hook to be added... 647 * point the hook's private info to the hook structure. 648 * 649 * The following hook names are special: 650 * Ethernet: the hook that should be connected to a NIC. 651 * debug: copies of data sent out here (when I write the code). 652 * All other hook names need only be unique. (the framework checks this). 653 */ 654 static int 655 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 656 { 657 const priv_p privp = NG_NODE_PRIVATE(node); 658 sessp sp; 659 660 AAA 661 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 662 privp->ethernet_hook = hook; 663 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook); 664 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 665 privp->debug_hook = hook; 666 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook); 667 } else { 668 /* 669 * Any other unique name is OK. 670 * The infrastructure has already checked that it's unique, 671 * so just allocate it and hook it in. 672 */ 673 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 674 if (sp == NULL) { 675 return (ENOMEM); 676 } 677 678 NG_HOOK_SET_PRIVATE(hook, sp); 679 sp->hook = hook; 680 } 681 return(0); 682 } 683 684 /* 685 * Get a netgraph control message. 686 * Check it is one we understand. If needed, send a response. 687 * We sometimes save the address for an async action later. 688 * Always free the message. 689 */ 690 static int 691 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 692 { 693 priv_p privp = NG_NODE_PRIVATE(node); 694 struct ngpppoe_init_data *ourmsg = NULL; 695 struct ng_mesg *resp = NULL; 696 int error = 0; 697 hook_p hook = NULL; 698 sessp sp = NULL; 699 negp neg = NULL; 700 struct ng_mesg *msg; 701 702 AAA 703 NGI_GET_MSG(item, msg); 704 /* Deal with message according to cookie and command */ 705 switch (msg->header.typecookie) { 706 case NGM_PPPOE_COOKIE: 707 switch (msg->header.cmd) { 708 case NGM_PPPOE_CONNECT: 709 case NGM_PPPOE_LISTEN: 710 case NGM_PPPOE_OFFER: 711 case NGM_PPPOE_SERVICE: 712 ourmsg = (struct ngpppoe_init_data *)msg->data; 713 if (msg->header.arglen < sizeof(*ourmsg)) { 714 printf("pppoe: init data too small\n"); 715 LEAVE(EMSGSIZE); 716 } 717 if (msg->header.arglen - sizeof(*ourmsg) > 718 PPPOE_SERVICE_NAME_SIZE) { 719 printf("pppoe_rcvmsg: service name too big"); 720 LEAVE(EMSGSIZE); 721 } 722 if (msg->header.arglen - sizeof(*ourmsg) < 723 ourmsg->data_len) { 724 printf("pppoe: init data has bad length," 725 " %d should be %zd\n", ourmsg->data_len, 726 msg->header.arglen - sizeof (*ourmsg)); 727 LEAVE(EMSGSIZE); 728 } 729 730 /* make sure strcmp will terminate safely */ 731 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 732 733 /* cycle through all known hooks */ 734 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 735 if (NG_HOOK_NAME(hook) 736 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0) 737 break; 738 } 739 if (hook == NULL) { 740 LEAVE(ENOENT); 741 } 742 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook) 743 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) { 744 LEAVE(EINVAL); 745 } 746 sp = NG_HOOK_PRIVATE(hook); 747 748 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 749 /* 750 * Ensure we aren't already listening for this 751 * service. 752 */ 753 if (pppoe_match_svc(node, ourmsg->data, 754 ourmsg->data_len, NG_MATCH_EXACT) != NULL) { 755 LEAVE(EEXIST); 756 } 757 } 758 759 /* 760 * PPPOE_SERVICE advertisments are set up 761 * on sessions that are in PRIMED state. 762 */ 763 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 764 break; 765 } 766 if (sp->state |= PPPOE_SNONE) { 767 printf("pppoe: Session already active\n"); 768 LEAVE(EISCONN); 769 } 770 771 /* 772 * set up prototype header 773 */ 774 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE, 775 M_NOWAIT | M_ZERO); 776 777 if (neg == NULL) { 778 printf("pppoe: Session out of memory\n"); 779 LEAVE(ENOMEM); 780 } 781 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 782 if(neg->m == NULL) { 783 printf("pppoe: Session out of mbufs\n"); 784 FREE(neg, M_NETGRAPH_PPPOE); 785 LEAVE(ENOBUFS); 786 } 787 neg->m->m_pkthdr.rcvif = NULL; 788 MCLGET(neg->m, M_DONTWAIT); 789 if ((neg->m->m_flags & M_EXT) == 0) { 790 printf("pppoe: Session out of mcls\n"); 791 m_freem(neg->m); 792 FREE(neg, M_NETGRAPH_PPPOE); 793 LEAVE(ENOBUFS); 794 } 795 sp->neg = neg; 796 callout_handle_init( &neg->timeout_handle); 797 neg->m->m_len = sizeof(struct pppoe_full_hdr); 798 neg->pkt = mtod(neg->m, union packet*); 799 memcpy((void *)&neg->pkt->pkt_header.eh, 800 (const void *)privp->mode->eh_prototype, 801 sizeof(struct ether_header)); 802 neg->pkt->pkt_header.ph.ver = 0x1; 803 neg->pkt->pkt_header.ph.type = 0x1; 804 neg->pkt->pkt_header.ph.sid = 0x0000; 805 neg->timeout = 0; 806 807 sp->creator = NGI_RETADDR(item); 808 } 809 switch (msg->header.cmd) { 810 case NGM_PPPOE_GET_STATUS: 811 { 812 struct ngpppoestat *stats; 813 814 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 815 if (!resp) { 816 LEAVE(ENOMEM); 817 } 818 stats = (struct ngpppoestat *) resp->data; 819 stats->packets_in = privp->packets_in; 820 stats->packets_out = privp->packets_out; 821 break; 822 } 823 case NGM_PPPOE_CONNECT: 824 /* 825 * Check the hook exists and is Uninitialised. 826 * Send a PADI request, and start the timeout logic. 827 * Store the originator of this message so we can send 828 * a success of fail message to them later. 829 * Move the session to SINIT 830 * Set up the session to the correct state and 831 * start it. 832 */ 833 neg->service.hdr.tag_type = PTT_SRV_NAME; 834 neg->service.hdr.tag_len = 835 htons((u_int16_t)ourmsg->data_len); 836 if (ourmsg->data_len) 837 bcopy(ourmsg->data, neg->service.data, 838 ourmsg->data_len); 839 neg->service_len = ourmsg->data_len; 840 pppoe_start(sp); 841 break; 842 case NGM_PPPOE_LISTEN: 843 /* 844 * Check the hook exists and is Uninitialised. 845 * Install the service matching string. 846 * Store the originator of this message so we can send 847 * a success of fail message to them later. 848 * Move the hook to 'LISTENING' 849 */ 850 neg->service.hdr.tag_type = PTT_SRV_NAME; 851 neg->service.hdr.tag_len = 852 htons((u_int16_t)ourmsg->data_len); 853 854 if (ourmsg->data_len) 855 bcopy(ourmsg->data, neg->service.data, 856 ourmsg->data_len); 857 neg->service_len = ourmsg->data_len; 858 neg->pkt->pkt_header.ph.code = PADT_CODE; 859 /* 860 * wait for PADI packet coming from ethernet 861 */ 862 sp->state = PPPOE_LISTENING; 863 break; 864 case NGM_PPPOE_OFFER: 865 /* 866 * Check the hook exists and is Uninitialised. 867 * Store the originator of this message so we can send 868 * a success of fail message to them later. 869 * Store the AC-Name given and go to PRIMED. 870 */ 871 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 872 neg->ac_name.hdr.tag_len = 873 htons((u_int16_t)ourmsg->data_len); 874 if (ourmsg->data_len) 875 bcopy(ourmsg->data, neg->ac_name.data, 876 ourmsg->data_len); 877 neg->ac_name_len = ourmsg->data_len; 878 neg->pkt->pkt_header.ph.code = PADO_CODE; 879 /* 880 * Wait for PADI packet coming from hook 881 */ 882 sp->state = PPPOE_PRIMED; 883 break; 884 case NGM_PPPOE_SERVICE: 885 /* 886 * Check the session is primed. 887 * for now just allow ONE service to be advertised. 888 * If you do it twice you just overwrite. 889 */ 890 if (sp->state != PPPOE_PRIMED) { 891 printf("pppoe: Session not primed\n"); 892 LEAVE(EISCONN); 893 } 894 neg = sp->neg; 895 neg->service.hdr.tag_type = PTT_SRV_NAME; 896 neg->service.hdr.tag_len = 897 htons((u_int16_t)ourmsg->data_len); 898 899 if (ourmsg->data_len) 900 bcopy(ourmsg->data, neg->service.data, 901 ourmsg->data_len); 902 neg->service_len = ourmsg->data_len; 903 break; 904 case NGM_PPPOE_SETMODE: 905 { 906 const struct ng_pppoe_mode_t *mode; 907 char *s; 908 size_t len; 909 910 if (msg->header.arglen == 0) 911 LEAVE(EINVAL); 912 913 s = (char *)msg->data; 914 len = msg->header.arglen - 1; 915 916 /* Search for matching mode string */ 917 for (mode = ng_pppoe_modes; mode->id != 0; mode++ ) 918 if ((strlen(mode->name) == len) && 919 !strncmp(mode->name, s, len)) 920 break; /* found */ 921 922 if (mode->id != 0) 923 privp->mode = mode; 924 else 925 LEAVE(EINVAL); 926 break; 927 } 928 case NGM_PPPOE_GETMODE: 929 NG_MKRESPONSE(resp, msg, strlen(privp->mode->name) + 1, 930 M_NOWAIT); 931 if (resp == NULL) 932 LEAVE(ENOMEM); 933 strlcpy((char *)resp->data, privp->mode->name, 934 strlen(privp->mode->name) + 1); 935 break; 936 default: 937 LEAVE(EINVAL); 938 } 939 break; 940 default: 941 LEAVE(EINVAL); 942 } 943 944 /* Take care of synchronous response, if any */ 945 quit: 946 NG_RESPOND_MSG(error, node, item, resp); 947 /* Free the message and return */ 948 NG_FREE_MSG(msg); 949 return(error); 950 } 951 952 /* 953 * Start a client into the first state. A separate function because 954 * it can be needed if the negotiation times out. 955 */ 956 static void 957 pppoe_start(sessp sp) 958 { 959 priv_p privp = NG_NODE_PRIVATE(NG_PPPOE_SESSION_NODE(sp)); 960 struct { 961 struct pppoe_tag hdr; 962 union uniq data; 963 } __packed uniqtag; 964 965 /* 966 * kick the state machine into starting up 967 */ 968 AAA 969 sp->state = PPPOE_SINIT; 970 /* Reset the packet header to broadcast. Since we are in a client 971 * mode use configured ethertype. */ 972 memcpy((void *)&sp->neg->pkt->pkt_header.eh, 973 (const void *)privp->mode->eh_prototype, 974 sizeof(struct ether_header)); 975 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 976 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 977 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 978 uniqtag.data.pointer = sp; 979 init_tags(sp); 980 insert_tag(sp, &uniqtag.hdr); 981 insert_tag(sp, &sp->neg->service.hdr); 982 make_packet(sp); 983 sendpacket(sp); 984 } 985 986 static int 987 send_acname(sessp sp, const struct pppoe_tag *tag) 988 { 989 int error, tlen; 990 struct ng_mesg *msg; 991 struct ngpppoe_sts *sts; 992 993 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 994 sizeof(struct ngpppoe_sts), M_NOWAIT); 995 if (msg == NULL) 996 return (ENOMEM); 997 998 sts = (struct ngpppoe_sts *)msg->data; 999 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1000 strncpy(sts->hook, tag->tag_data, tlen); 1001 sts->hook[tlen] = '\0'; 1002 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1003 1004 return (error); 1005 } 1006 1007 static int 1008 send_sessionid(sessp sp) 1009 { 1010 int error; 1011 struct ng_mesg *msg; 1012 1013 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1014 sizeof(u_int16_t), M_NOWAIT); 1015 if (msg == NULL) 1016 return (ENOMEM); 1017 1018 *(u_int16_t *)msg->data = sp->Session_ID; 1019 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1020 1021 return (error); 1022 } 1023 1024 /* 1025 * Receive data, and do something with it. 1026 * The caller will never free m, so if we use up this data 1027 * or abort we must free it. 1028 */ 1029 static int 1030 ng_pppoe_rcvdata(hook_p hook, item_p item) 1031 { 1032 node_p node = NG_HOOK_NODE(hook); 1033 const priv_p privp = NG_NODE_PRIVATE(node); 1034 sessp sp = NG_HOOK_PRIVATE(hook); 1035 const struct pppoe_full_hdr *wh; 1036 const struct pppoe_hdr *ph; 1037 int error = 0; 1038 u_int16_t session; 1039 u_int16_t length; 1040 u_int8_t code; 1041 const struct pppoe_tag *utag = NULL, *tag = NULL; 1042 hook_p sendhook; 1043 struct { 1044 struct pppoe_tag hdr; 1045 union uniq data; 1046 } __packed uniqtag; 1047 negp neg = NULL; 1048 struct mbuf *m; 1049 1050 AAA 1051 NGI_GET_M(item, m); 1052 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1053 /* 1054 * Data from the debug hook gets sent without modification 1055 * straight to the ethernet. 1056 */ 1057 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook); 1058 privp->packets_out++; 1059 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1060 /* 1061 * Incoming data. 1062 * Dig out various fields from the packet. 1063 * use them to decide where to send it. 1064 */ 1065 1066 privp->packets_in++; 1067 if( m->m_len < sizeof(*wh)) { 1068 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1069 if (m == NULL) { 1070 printf("couldn't m_pullup\n"); 1071 LEAVE(ENOBUFS); 1072 } 1073 } 1074 wh = mtod(m, struct pppoe_full_hdr *); 1075 length = ntohs(wh->ph.length); 1076 switch(wh->eh.ether_type) { 1077 case ETHERTYPE_PPPOE_STUPID_DISC: /* fall through */ 1078 case ETHERTYPE_PPPOE_DISC: 1079 /* 1080 * We need to try to make sure that the tag area 1081 * is contiguous, or we could wander off the end 1082 * of a buffer and make a mess. 1083 * (Linux wouldn't have this problem). 1084 */ 1085 if (m->m_pkthdr.len <= MHLEN) { 1086 if( m->m_len < m->m_pkthdr.len) { 1087 m = m_pullup(m, m->m_pkthdr.len); 1088 if (m == NULL) { 1089 printf("couldn't m_pullup\n"); 1090 LEAVE(ENOBUFS); 1091 } 1092 } 1093 } 1094 if (m->m_len != m->m_pkthdr.len) { 1095 /* 1096 * It's not all in one piece. 1097 * We need to do extra work. 1098 * Put it into a cluster. 1099 */ 1100 struct mbuf *n; 1101 n = m_dup(m, M_DONTWAIT); 1102 m_freem(m); 1103 m = n; 1104 if (m) { 1105 /* just check we got a cluster */ 1106 if (m->m_len != m->m_pkthdr.len) { 1107 m_freem(m); 1108 m = NULL; 1109 } 1110 } 1111 if (m == NULL) { 1112 printf("packet fragmented\n"); 1113 LEAVE(EMSGSIZE); 1114 } 1115 } 1116 wh = mtod(m, struct pppoe_full_hdr *); 1117 length = ntohs(wh->ph.length); 1118 ph = &wh->ph; 1119 session = ntohs(wh->ph.sid); 1120 code = wh->ph.code; 1121 1122 switch(code) { 1123 case PADI_CODE: 1124 /* 1125 * We are a server: 1126 * Look for a hook with the required service 1127 * and send the ENTIRE packet up there. 1128 * It should come back to a new hook in 1129 * PRIMED state. Look there for further 1130 * processing. 1131 */ 1132 tag = get_tag(ph, PTT_SRV_NAME); 1133 if (tag == NULL) { 1134 printf("no service tag\n"); 1135 LEAVE(ENETUNREACH); 1136 } 1137 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook), 1138 tag->tag_data, ntohs(tag->tag_len), 1139 NG_MATCH_ANY); 1140 if (sendhook) { 1141 NG_FWD_NEW_DATA(error, item, 1142 sendhook, m); 1143 } else { 1144 LEAVE(ENETUNREACH); 1145 } 1146 break; 1147 case PADO_CODE: 1148 /* 1149 * We are a client: 1150 * Use the host_uniq tag to find the 1151 * hook this is in response to. 1152 * Received #2, now send #3 1153 * For now simply accept the first we receive. 1154 */ 1155 utag = get_tag(ph, PTT_HOST_UNIQ); 1156 if ((utag == NULL) 1157 || (ntohs(utag->tag_len) != sizeof(sp))) { 1158 printf("no host unique field\n"); 1159 LEAVE(ENETUNREACH); 1160 } 1161 1162 sendhook = pppoe_finduniq(node, utag); 1163 if (sendhook == NULL) { 1164 printf("no matching session\n"); 1165 LEAVE(ENETUNREACH); 1166 } 1167 1168 /* 1169 * Check the session is in the right state. 1170 * It needs to be in PPPOE_SINIT. 1171 */ 1172 sp = NG_HOOK_PRIVATE(sendhook); 1173 if (sp->state != PPPOE_SINIT) { 1174 printf("session in wrong state\n"); 1175 LEAVE(ENETUNREACH); 1176 } 1177 neg = sp->neg; 1178 untimeout(pppoe_ticker, sendhook, 1179 neg->timeout_handle); 1180 1181 /* 1182 * This is the first time we hear 1183 * from the server, so note it's 1184 * unicast address, replacing the 1185 * broadcast address . 1186 */ 1187 bcopy(wh->eh.ether_shost, 1188 neg->pkt->pkt_header.eh.ether_dhost, 1189 ETHER_ADDR_LEN); 1190 neg->timeout = 0; 1191 neg->pkt->pkt_header.ph.code = PADR_CODE; 1192 init_tags(sp); 1193 insert_tag(sp, utag); /* Host Unique */ 1194 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1195 insert_tag(sp, tag); /* return cookie */ 1196 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1197 insert_tag(sp, tag); /* return it */ 1198 send_acname(sp, tag); 1199 } 1200 insert_tag(sp, &neg->service.hdr); /* Service */ 1201 scan_tags(sp, ph); 1202 make_packet(sp); 1203 sp->state = PPPOE_SREQ; 1204 sendpacket(sp); 1205 break; 1206 case PADR_CODE: 1207 1208 /* 1209 * We are a server: 1210 * Use the ac_cookie tag to find the 1211 * hook this is in response to. 1212 */ 1213 utag = get_tag(ph, PTT_AC_COOKIE); 1214 if ((utag == NULL) 1215 || (ntohs(utag->tag_len) != sizeof(sp))) { 1216 LEAVE(ENETUNREACH); 1217 } 1218 1219 sendhook = pppoe_finduniq(node, utag); 1220 if (sendhook == NULL) { 1221 LEAVE(ENETUNREACH); 1222 } 1223 1224 /* 1225 * Check the session is in the right state. 1226 * It needs to be in PPPOE_SOFFER 1227 * or PPPOE_NEWCONNECTED. If the latter, 1228 * then this is a retry by the client. 1229 * so be nice, and resend. 1230 */ 1231 sp = NG_HOOK_PRIVATE(sendhook); 1232 if (sp->state == PPPOE_NEWCONNECTED) { 1233 /* 1234 * Whoa! drop back to resend that 1235 * PADS packet. 1236 * We should still have a copy of it. 1237 */ 1238 sp->state = PPPOE_SOFFER; 1239 } 1240 if (sp->state != PPPOE_SOFFER) { 1241 LEAVE (ENETUNREACH); 1242 break; 1243 } 1244 neg = sp->neg; 1245 untimeout(pppoe_ticker, sendhook, 1246 neg->timeout_handle); 1247 neg->pkt->pkt_header.ph.code = PADS_CODE; 1248 if (sp->Session_ID == 0) 1249 neg->pkt->pkt_header.ph.sid = 1250 htons(sp->Session_ID 1251 = get_new_sid(node)); 1252 send_sessionid(sp); 1253 neg->timeout = 0; 1254 /* 1255 * start working out the tags to respond with. 1256 */ 1257 init_tags(sp); 1258 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1259 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1260 insert_tag(sp, tag);/* return service */ 1261 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1262 insert_tag(sp, tag); /* return it */ 1263 insert_tag(sp, utag); /* ac_cookie */ 1264 scan_tags(sp, ph); 1265 make_packet(sp); 1266 sp->state = PPPOE_NEWCONNECTED; 1267 sendpacket(sp); 1268 /* 1269 * Having sent the last Negotiation header, 1270 * Set up the stored packet header to 1271 * be correct for the actual session. 1272 * But keep the negotialtion stuff 1273 * around in case we need to resend this last 1274 * packet. We'll discard it when we move 1275 * from NEWCONNECTED to CONNECTED 1276 */ 1277 sp->pkt_hdr = neg->pkt->pkt_header; 1278 /* Configure ethertype depending on what 1279 * ethertype was used at discovery phase */ 1280 if (sp->pkt_hdr.eh.ether_type == 1281 ETHERTYPE_PPPOE_STUPID_DISC) 1282 sp->pkt_hdr.eh.ether_type 1283 = ETHERTYPE_PPPOE_STUPID_SESS; 1284 else 1285 sp->pkt_hdr.eh.ether_type 1286 = ETHERTYPE_PPPOE_SESS; 1287 sp->pkt_hdr.ph.code = 0; 1288 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1289 break; 1290 case PADS_CODE: 1291 /* 1292 * We are a client: 1293 * Use the host_uniq tag to find the 1294 * hook this is in response to. 1295 * take the session ID and store it away. 1296 * Also make sure the pre-made header is 1297 * correct and set us into Session mode. 1298 */ 1299 utag = get_tag(ph, PTT_HOST_UNIQ); 1300 if ((utag == NULL) 1301 || (ntohs(utag->tag_len) != sizeof(sp))) { 1302 LEAVE (ENETUNREACH); 1303 break; 1304 } 1305 sendhook = pppoe_finduniq(node, utag); 1306 if (sendhook == NULL) { 1307 LEAVE(ENETUNREACH); 1308 } 1309 1310 /* 1311 * Check the session is in the right state. 1312 * It needs to be in PPPOE_SREQ. 1313 */ 1314 sp = NG_HOOK_PRIVATE(sendhook); 1315 if (sp->state != PPPOE_SREQ) { 1316 LEAVE(ENETUNREACH); 1317 } 1318 neg = sp->neg; 1319 untimeout(pppoe_ticker, sendhook, 1320 neg->timeout_handle); 1321 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1322 sp->Session_ID = ntohs(wh->ph.sid); 1323 send_sessionid(sp); 1324 neg->timeout = 0; 1325 sp->state = PPPOE_CONNECTED; 1326 /* 1327 * Now we have gone to Connected mode, 1328 * Free all resources needed for 1329 * negotiation. 1330 * Keep a copy of the header we will be using. 1331 */ 1332 sp->pkt_hdr = neg->pkt->pkt_header; 1333 if (privp->mode->id == PPPOE_NONSTANDARD) 1334 sp->pkt_hdr.eh.ether_type 1335 = ETHERTYPE_PPPOE_STUPID_SESS; 1336 else 1337 sp->pkt_hdr.eh.ether_type 1338 = ETHERTYPE_PPPOE_SESS; 1339 sp->pkt_hdr.ph.code = 0; 1340 m_freem(neg->m); 1341 FREE(sp->neg, M_NETGRAPH_PPPOE); 1342 sp->neg = NULL; 1343 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1344 break; 1345 case PADT_CODE: 1346 /* 1347 * Send a 'close' message to the controlling 1348 * process (the one that set us up); 1349 * And then tear everything down. 1350 * 1351 * Find matching peer/session combination. 1352 */ 1353 sendhook = pppoe_findsession(node, wh); 1354 if (sendhook == NULL) { 1355 LEAVE(ENETUNREACH); 1356 } 1357 /* send message to creator */ 1358 /* close hook */ 1359 if (sendhook) { 1360 ng_rmhook_self(sendhook); 1361 } 1362 break; 1363 default: 1364 LEAVE(EPFNOSUPPORT); 1365 } 1366 break; 1367 case ETHERTYPE_PPPOE_STUPID_SESS: 1368 case ETHERTYPE_PPPOE_SESS: 1369 /* 1370 * find matching peer/session combination. 1371 */ 1372 sendhook = pppoe_findsession(node, wh); 1373 if (sendhook == NULL) { 1374 LEAVE (ENETUNREACH); 1375 break; 1376 } 1377 sp = NG_HOOK_PRIVATE(sendhook); 1378 m_adj(m, sizeof(*wh)); 1379 if (m->m_pkthdr.len < length) { 1380 /* Packet too short, dump it */ 1381 LEAVE(EMSGSIZE); 1382 } 1383 1384 /* Also need to trim excess at the end */ 1385 if (m->m_pkthdr.len > length) { 1386 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1387 } 1388 if ( sp->state != PPPOE_CONNECTED) { 1389 if (sp->state == PPPOE_NEWCONNECTED) { 1390 sp->state = PPPOE_CONNECTED; 1391 /* 1392 * Now we have gone to Connected mode, 1393 * Free all resources needed for 1394 * negotiation. Be paranoid about 1395 * whether there may be a timeout. 1396 */ 1397 m_freem(sp->neg->m); 1398 untimeout(pppoe_ticker, sendhook, 1399 sp->neg->timeout_handle); 1400 FREE(sp->neg, M_NETGRAPH_PPPOE); 1401 sp->neg = NULL; 1402 } else { 1403 LEAVE (ENETUNREACH); 1404 break; 1405 } 1406 } 1407 NG_FWD_NEW_DATA( error, item, sendhook, m); 1408 break; 1409 default: 1410 LEAVE(EPFNOSUPPORT); 1411 } 1412 } else { 1413 /* 1414 * Not ethernet or debug hook.. 1415 * 1416 * The packet has come in on a normal hook. 1417 * We need to find out what kind of hook, 1418 * So we can decide how to handle it. 1419 * Check the hook's state. 1420 */ 1421 sp = NG_HOOK_PRIVATE(hook); 1422 switch (sp->state) { 1423 case PPPOE_NEWCONNECTED: 1424 case PPPOE_CONNECTED: { 1425 static const u_char addrctrl[] = { 0xff, 0x03 }; 1426 struct pppoe_full_hdr *wh; 1427 1428 /* 1429 * Remove PPP address and control fields, if any. 1430 * For example, ng_ppp(4) always sends LCP packets 1431 * with address and control fields as required by 1432 * generic PPP. PPPoE is an exception to the rule. 1433 */ 1434 if (m->m_pkthdr.len >= 2) { 1435 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1436 LEAVE(ENOBUFS); 1437 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1438 m_adj(m, 2); 1439 } 1440 /* 1441 * Bang in a pre-made header, and set the length up 1442 * to be correct. Then send it to the ethernet driver. 1443 * But first correct the length. 1444 */ 1445 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1446 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1447 if (m == NULL) { 1448 LEAVE(ENOBUFS); 1449 } 1450 wh = mtod(m, struct pppoe_full_hdr *); 1451 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1452 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m); 1453 privp->packets_out++; 1454 break; 1455 } 1456 case PPPOE_PRIMED: 1457 /* 1458 * A PADI packet is being returned by the application 1459 * that has set up this hook. This indicates that it 1460 * wants us to offer service. 1461 */ 1462 neg = sp->neg; 1463 if (m->m_len < sizeof(*wh)) { 1464 m = m_pullup(m, sizeof(*wh)); 1465 if (m == NULL) { 1466 LEAVE(ENOBUFS); 1467 } 1468 } 1469 wh = mtod(m, struct pppoe_full_hdr *); 1470 ph = &wh->ph; 1471 session = ntohs(wh->ph.sid); 1472 length = ntohs(wh->ph.length); 1473 code = wh->ph.code; 1474 /* Use peers mode in session */ 1475 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1476 if ( code != PADI_CODE) { 1477 LEAVE(EINVAL); 1478 }; 1479 untimeout(pppoe_ticker, hook, 1480 neg->timeout_handle); 1481 1482 /* 1483 * This is the first time we hear 1484 * from the client, so note it's 1485 * unicast address, replacing the 1486 * broadcast address. 1487 */ 1488 bcopy(wh->eh.ether_shost, 1489 neg->pkt->pkt_header.eh.ether_dhost, 1490 ETHER_ADDR_LEN); 1491 sp->state = PPPOE_SOFFER; 1492 neg->timeout = 0; 1493 neg->pkt->pkt_header.ph.code = PADO_CODE; 1494 1495 /* 1496 * start working out the tags to respond with. 1497 */ 1498 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1499 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1500 uniqtag.data.pointer = sp; 1501 init_tags(sp); 1502 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1503 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1504 insert_tag(sp, tag); /* return service */ 1505 /* 1506 * If we have a NULL service request 1507 * and have an extra service defined in this hook, 1508 * then also add a tag for the extra service. 1509 * XXX this is a hack. eventually we should be able 1510 * to support advertising many services, not just one 1511 */ 1512 if (((tag == NULL) || (tag->tag_len == 0)) 1513 && (neg->service.hdr.tag_len != 0)) { 1514 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1515 } 1516 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1517 insert_tag(sp, tag); /* returned hostunique */ 1518 insert_tag(sp, &uniqtag.hdr); 1519 scan_tags(sp, ph); 1520 make_packet(sp); 1521 sendpacket(sp); 1522 break; 1523 1524 /* 1525 * Packets coming from the hook make no sense 1526 * to sessions in these states. Throw them away. 1527 */ 1528 case PPPOE_SINIT: 1529 case PPPOE_SREQ: 1530 case PPPOE_SOFFER: 1531 case PPPOE_SNONE: 1532 case PPPOE_LISTENING: 1533 case PPPOE_DEAD: 1534 default: 1535 LEAVE(ENETUNREACH); 1536 } 1537 } 1538 quit: 1539 if (item) 1540 NG_FREE_ITEM(item); 1541 NG_FREE_M(m); 1542 return error; 1543 } 1544 1545 /* 1546 * Do local shutdown processing.. 1547 * If we are a persistant device, we might refuse to go away, and 1548 * we'd only remove our links and reset ourself. 1549 */ 1550 static int 1551 ng_pppoe_shutdown(node_p node) 1552 { 1553 const priv_p privdata = NG_NODE_PRIVATE(node); 1554 1555 AAA 1556 NG_NODE_SET_PRIVATE(node, NULL); 1557 NG_NODE_UNREF(privdata->node); 1558 FREE(privdata, M_NETGRAPH_PPPOE); 1559 return (0); 1560 } 1561 1562 /* 1563 * This is called once we've already connected a new hook to the other node. 1564 * It gives us a chance to balk at the last minute. 1565 */ 1566 static int 1567 ng_pppoe_connect(hook_p hook) 1568 { 1569 /* be really amiable and just say "YUP that's OK by me! " */ 1570 return (0); 1571 } 1572 1573 /* 1574 * Hook disconnection 1575 * 1576 * Clean up all dangling links and information about the session/hook. 1577 * For this type, removal of the last link destroys the node 1578 */ 1579 static int 1580 ng_pppoe_disconnect(hook_p hook) 1581 { 1582 node_p node = NG_HOOK_NODE(hook); 1583 priv_p privp = NG_NODE_PRIVATE(node); 1584 sessp sp; 1585 int hooks; 1586 1587 AAA 1588 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */ 1589 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) { 1590 privp->debug_hook = NULL; 1591 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) { 1592 privp->ethernet_hook = NULL; 1593 if (NG_NODE_IS_VALID(node)) 1594 ng_rmnode_self(node); 1595 } else { 1596 sp = NG_HOOK_PRIVATE(hook); 1597 if (sp->state != PPPOE_SNONE ) { 1598 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1599 } 1600 /* 1601 * According to the spec, if we are connected, 1602 * we should send a DISC packet if we are shutting down 1603 * a session. 1604 */ 1605 if ((privp->ethernet_hook) 1606 && ((sp->state == PPPOE_CONNECTED) 1607 || (sp->state == PPPOE_NEWCONNECTED))) { 1608 struct mbuf *m; 1609 struct pppoe_full_hdr *wh; 1610 struct pppoe_tag *tag; 1611 int msglen = strlen(SIGNOFF); 1612 int error = 0; 1613 1614 /* revert the stored header to DISC/PADT mode */ 1615 wh = &sp->pkt_hdr; 1616 wh->ph.code = PADT_CODE; 1617 /* Configure ethertype depending on what was used during 1618 * sessions stage. */ 1619 if (sp->pkt_hdr.eh.ether_type == 1620 ETHERTYPE_PPPOE_STUPID_SESS) 1621 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC; 1622 else 1623 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1624 1625 /* generate a packet of that type */ 1626 MGETHDR(m, M_DONTWAIT, MT_DATA); 1627 if(m == NULL) 1628 printf("pppoe: Session out of mbufs\n"); 1629 else { 1630 m->m_pkthdr.rcvif = NULL; 1631 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1632 bcopy((caddr_t)wh, mtod(m, caddr_t), 1633 sizeof(*wh)); 1634 /* 1635 * Add a General error message and adjust 1636 * sizes 1637 */ 1638 wh = mtod(m, struct pppoe_full_hdr *); 1639 tag = wh->ph.tag; 1640 tag->tag_type = PTT_GEN_ERR; 1641 tag->tag_len = htons((u_int16_t)msglen); 1642 strncpy(tag->tag_data, SIGNOFF, msglen); 1643 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1644 msglen); 1645 wh->ph.length = htons(sizeof(*tag) + msglen); 1646 NG_SEND_DATA_ONLY(error, 1647 privp->ethernet_hook, m); 1648 } 1649 } 1650 /* 1651 * As long as we have somewhere to store the timeout handle, 1652 * we may have a timeout pending.. get rid of it. 1653 */ 1654 if (sp->neg) { 1655 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1656 if (sp->neg->m) 1657 m_freem(sp->neg->m); 1658 FREE(sp->neg, M_NETGRAPH_PPPOE); 1659 } 1660 FREE(sp, M_NETGRAPH_PPPOE); 1661 NG_HOOK_SET_PRIVATE(hook, NULL); 1662 /* work out how many session hooks there are */ 1663 /* Node goes away on last session hook removal */ 1664 if (privp->ethernet_hook) hooks -= 1; 1665 if (privp->debug_hook) hooks -= 1; 1666 } 1667 if ((NG_NODE_NUMHOOKS(node) == 0) 1668 && (NG_NODE_IS_VALID(node))) 1669 ng_rmnode_self(node); 1670 return (0); 1671 } 1672 1673 /* 1674 * timeouts come here. 1675 */ 1676 static void 1677 pppoe_ticker(void *arg) 1678 { 1679 int s = splnet(); 1680 hook_p hook = arg; 1681 sessp sp = NG_HOOK_PRIVATE(hook); 1682 negp neg = sp->neg; 1683 int error = 0; 1684 struct mbuf *m0 = NULL; 1685 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1686 1687 AAA 1688 switch(sp->state) { 1689 /* 1690 * resend the last packet, using an exponential backoff. 1691 * After a period of time, stop growing the backoff, 1692 * and either leave it, or revert to the start. 1693 */ 1694 case PPPOE_SINIT: 1695 case PPPOE_SREQ: 1696 /* timeouts on these produce resends */ 1697 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1698 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1699 neg->timeout_handle = timeout(pppoe_ticker, 1700 hook, neg->timeout * hz); 1701 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1702 if (sp->state == PPPOE_SREQ) { 1703 /* revert to SINIT mode */ 1704 pppoe_start(sp); 1705 } else { 1706 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1707 } 1708 } 1709 break; 1710 case PPPOE_PRIMED: 1711 case PPPOE_SOFFER: 1712 /* a timeout on these says "give up" */ 1713 ng_rmhook_self(hook); 1714 break; 1715 default: 1716 /* timeouts have no meaning in other states */ 1717 printf("pppoe: unexpected timeout\n"); 1718 } 1719 splx(s); 1720 } 1721 1722 1723 static void 1724 sendpacket(sessp sp) 1725 { 1726 int error = 0; 1727 struct mbuf *m0 = NULL; 1728 hook_p hook = sp->hook; 1729 negp neg = sp->neg; 1730 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1731 1732 AAA 1733 switch(sp->state) { 1734 case PPPOE_LISTENING: 1735 case PPPOE_DEAD: 1736 case PPPOE_SNONE: 1737 case PPPOE_CONNECTED: 1738 printf("pppoe: sendpacket: unexpected state\n"); 1739 break; 1740 1741 case PPPOE_NEWCONNECTED: 1742 /* send the PADS without a timeout - we're now connected */ 1743 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1744 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1745 break; 1746 1747 case PPPOE_PRIMED: 1748 /* No packet to send, but set up the timeout */ 1749 neg->timeout_handle = timeout(pppoe_ticker, 1750 hook, PPPOE_OFFER_TIMEOUT * hz); 1751 break; 1752 1753 case PPPOE_SOFFER: 1754 /* 1755 * send the offer but if they don't respond 1756 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1757 */ 1758 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1759 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1760 neg->timeout_handle = timeout(pppoe_ticker, 1761 hook, PPPOE_OFFER_TIMEOUT * hz); 1762 break; 1763 1764 case PPPOE_SINIT: 1765 case PPPOE_SREQ: 1766 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1767 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1768 neg->timeout_handle = timeout(pppoe_ticker, hook, 1769 (hz * PPPOE_INITIAL_TIMEOUT)); 1770 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1771 break; 1772 1773 default: 1774 error = EINVAL; 1775 printf("pppoe: timeout: bad state\n"); 1776 } 1777 /* return (error); */ 1778 } 1779 1780 /* 1781 * Parse an incoming packet to see if any tags should be copied to the 1782 * output packet. Don't do any tags that have been handled in the main 1783 * state machine. 1784 */ 1785 static const struct pppoe_tag* 1786 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1787 { 1788 const char *const end = (const char *)next_tag(ph); 1789 const char *ptn; 1790 const struct pppoe_tag *pt = &ph->tag[0]; 1791 /* 1792 * Keep processing tags while a tag header will still fit. 1793 */ 1794 AAA 1795 while((const char*)(pt + 1) <= end) { 1796 /* 1797 * If the tag data would go past the end of the packet, abort. 1798 */ 1799 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1800 if(ptn > end) 1801 return NULL; 1802 1803 switch (pt->tag_type) { 1804 case PTT_RELAY_SID: 1805 insert_tag(sp, pt); 1806 break; 1807 case PTT_EOL: 1808 return NULL; 1809 case PTT_SRV_NAME: 1810 case PTT_AC_NAME: 1811 case PTT_HOST_UNIQ: 1812 case PTT_AC_COOKIE: 1813 case PTT_VENDOR: 1814 case PTT_SRV_ERR: 1815 case PTT_SYS_ERR: 1816 case PTT_GEN_ERR: 1817 break; 1818 } 1819 pt = (const struct pppoe_tag*)ptn; 1820 } 1821 return NULL; 1822 } 1823 1824 static int 1825 pppoe_send_event(sessp sp, enum cmd cmdid) 1826 { 1827 int error; 1828 struct ng_mesg *msg; 1829 struct ngpppoe_sts *sts; 1830 1831 AAA 1832 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1833 sizeof(struct ngpppoe_sts), M_NOWAIT); 1834 if (msg == NULL) 1835 return (ENOMEM); 1836 sts = (struct ngpppoe_sts *)msg->data; 1837 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1838 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1839 return (error); 1840 }
Cache object: 94bf7c6183d2d8c23fae63de5e467126
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