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sys/netgraph/ng_pppoe.c
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1 /* 2 * ng_pppoe.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: releng/11.1/sys/netgraph/ng_pppoe.c 298813 2016-04-29 21:25:05Z pfg $ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/ktr.h> 48 #include <sys/mbuf.h> 49 #include <sys/malloc.h> 50 #include <sys/errno.h> 51 #include <sys/syslog.h> 52 #include <net/ethernet.h> 53 54 #include <netgraph/ng_message.h> 55 #include <netgraph/netgraph.h> 56 #include <netgraph/ng_parse.h> 57 #include <netgraph/ng_pppoe.h> 58 #include <netgraph/ng_ether.h> 59 60 #ifdef NG_SEPARATE_MALLOC 61 static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 62 #else 63 #define M_NETGRAPH_PPPOE M_NETGRAPH 64 #endif 65 66 #define SIGNOFF "session closed" 67 68 /* 69 * This section contains the netgraph method declarations for the 70 * pppoe node. These methods define the netgraph pppoe 'type'. 71 */ 72 73 static ng_constructor_t ng_pppoe_constructor; 74 static ng_rcvmsg_t ng_pppoe_rcvmsg; 75 static ng_shutdown_t ng_pppoe_shutdown; 76 static ng_newhook_t ng_pppoe_newhook; 77 static ng_connect_t ng_pppoe_connect; 78 static ng_rcvdata_t ng_pppoe_rcvdata; 79 static ng_rcvdata_t ng_pppoe_rcvdata_ether; 80 static ng_rcvdata_t ng_pppoe_rcvdata_debug; 81 static ng_disconnect_t ng_pppoe_disconnect; 82 83 /* Parse type for struct ngpppoe_init_data */ 84 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 85 = NG_PPPOE_INIT_DATA_TYPE_INFO; 86 static const struct ng_parse_type ngpppoe_init_data_state_type = { 87 &ng_parse_struct_type, 88 &ngpppoe_init_data_type_fields 89 }; 90 91 /* Parse type for struct ngpppoe_sts */ 92 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 93 = NG_PPPOE_STS_TYPE_INFO; 94 static const struct ng_parse_type ng_pppoe_sts_state_type = { 95 &ng_parse_struct_type, 96 &ng_pppoe_sts_type_fields 97 }; 98 99 /* List of commands and how to convert arguments to/from ASCII */ 100 static const struct ng_cmdlist ng_pppoe_cmds[] = { 101 { 102 NGM_PPPOE_COOKIE, 103 NGM_PPPOE_CONNECT, 104 "pppoe_connect", 105 &ngpppoe_init_data_state_type, 106 NULL 107 }, 108 { 109 NGM_PPPOE_COOKIE, 110 NGM_PPPOE_LISTEN, 111 "pppoe_listen", 112 &ngpppoe_init_data_state_type, 113 NULL 114 }, 115 { 116 NGM_PPPOE_COOKIE, 117 NGM_PPPOE_OFFER, 118 "pppoe_offer", 119 &ngpppoe_init_data_state_type, 120 NULL 121 }, 122 { 123 NGM_PPPOE_COOKIE, 124 NGM_PPPOE_SERVICE, 125 "pppoe_service", 126 &ngpppoe_init_data_state_type, 127 NULL 128 }, 129 { 130 NGM_PPPOE_COOKIE, 131 NGM_PPPOE_SUCCESS, 132 "pppoe_success", 133 &ng_pppoe_sts_state_type, 134 NULL 135 }, 136 { 137 NGM_PPPOE_COOKIE, 138 NGM_PPPOE_FAIL, 139 "pppoe_fail", 140 &ng_pppoe_sts_state_type, 141 NULL 142 }, 143 { 144 NGM_PPPOE_COOKIE, 145 NGM_PPPOE_CLOSE, 146 "pppoe_close", 147 &ng_pppoe_sts_state_type, 148 NULL 149 }, 150 { 151 NGM_PPPOE_COOKIE, 152 NGM_PPPOE_SETMODE, 153 "pppoe_setmode", 154 &ng_parse_string_type, 155 NULL 156 }, 157 { 158 NGM_PPPOE_COOKIE, 159 NGM_PPPOE_GETMODE, 160 "pppoe_getmode", 161 NULL, 162 &ng_parse_string_type 163 }, 164 { 165 NGM_PPPOE_COOKIE, 166 NGM_PPPOE_SETENADDR, 167 "setenaddr", 168 &ng_parse_enaddr_type, 169 NULL 170 }, 171 { 172 NGM_PPPOE_COOKIE, 173 NGM_PPPOE_SETMAXP, 174 "setmaxp", 175 &ng_parse_uint16_type, 176 NULL 177 }, 178 { 0 } 179 }; 180 181 /* Netgraph node type descriptor */ 182 static struct ng_type typestruct = { 183 .version = NG_ABI_VERSION, 184 .name = NG_PPPOE_NODE_TYPE, 185 .constructor = ng_pppoe_constructor, 186 .rcvmsg = ng_pppoe_rcvmsg, 187 .shutdown = ng_pppoe_shutdown, 188 .newhook = ng_pppoe_newhook, 189 .connect = ng_pppoe_connect, 190 .rcvdata = ng_pppoe_rcvdata, 191 .disconnect = ng_pppoe_disconnect, 192 .cmdlist = ng_pppoe_cmds, 193 }; 194 NETGRAPH_INIT(pppoe, &typestruct); 195 196 /* 197 * States for the session state machine. 198 * These have no meaning if there is no hook attached yet. 199 */ 200 enum state { 201 PPPOE_SNONE=0, /* [both] Initial state */ 202 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 203 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 204 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 205 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 206 PPPOE_SREQ, /* [Client] Sent a Request */ 207 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 208 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 209 PPPOE_DEAD /* [Both] */ 210 }; 211 212 #define NUMTAGS 20 /* number of tags we are set up to work with */ 213 214 /* 215 * Information we store for each hook on each node for negotiating the 216 * session. The mbuf and cluster are freed once negotiation has completed. 217 * The whole negotiation block is then discarded. 218 */ 219 220 struct sess_neg { 221 struct mbuf *m; /* holds cluster with last sent packet */ 222 union packet *pkt; /* points within the above cluster */ 223 struct callout handle; /* see timeout(9) */ 224 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 225 u_int numtags; 226 const struct pppoe_tag *tags[NUMTAGS]; 227 u_int service_len; 228 u_int ac_name_len; 229 230 struct datatag service; 231 struct datatag ac_name; 232 }; 233 typedef struct sess_neg *negp; 234 235 /* 236 * Session information that is needed after connection. 237 */ 238 struct sess_con { 239 hook_p hook; 240 uint16_t Session_ID; 241 enum state state; 242 ng_ID_t creator; /* who to notify */ 243 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 244 negp neg; /* used when negotiating */ 245 LIST_ENTRY(sess_con) sessions; 246 }; 247 typedef struct sess_con *sessp; 248 249 #define SESSHASHSIZE 0x0100 250 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) 251 252 struct sess_hash_entry { 253 struct mtx mtx; 254 LIST_HEAD(hhead, sess_con) head; 255 }; 256 257 /* 258 * Information we store for each node 259 */ 260 struct PPPoE { 261 node_p node; /* back pointer to node */ 262 hook_p ethernet_hook; 263 hook_p debug_hook; 264 u_int packets_in; /* packets in from ethernet */ 265 u_int packets_out; /* packets out towards ethernet */ 266 uint32_t flags; 267 #define COMPAT_3COM 0x00000001 268 #define COMPAT_DLINK 0x00000002 269 struct ether_header eh; 270 LIST_HEAD(, sess_con) listeners; 271 struct sess_hash_entry sesshash[SESSHASHSIZE]; 272 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */ 273 }; 274 typedef struct PPPoE *priv_p; 275 276 union uniq { 277 char bytes[sizeof(void *)]; 278 void *pointer; 279 }; 280 281 #define LEAVE(x) do { error = x; goto quit; } while(0) 282 static void pppoe_start(sessp sp); 283 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 284 static const struct pppoe_tag *scan_tags(sessp sp, 285 const struct pppoe_hdr* ph); 286 static int pppoe_send_event(sessp sp, enum cmd cmdid); 287 288 /************************************************************************* 289 * Some basic utilities from the Linux version with author's permission.* 290 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 291 ************************************************************************/ 292 293 294 295 /* 296 * Return the location where the next tag can be put 297 */ 298 static __inline const struct pppoe_tag* 299 next_tag(const struct pppoe_hdr* ph) 300 { 301 return (const struct pppoe_tag*)(((const char*)(ph + 1)) 302 + ntohs(ph->length)); 303 } 304 305 /* 306 * Look for a tag of a specific type. 307 * Don't trust any length the other end says, 308 * but assume we already sanity checked ph->length. 309 */ 310 static const struct pppoe_tag* 311 get_tag(const struct pppoe_hdr* ph, uint16_t idx) 312 { 313 const char *const end = (const char *)next_tag(ph); 314 const struct pppoe_tag *pt = (const void *)(ph + 1); 315 const char *ptn; 316 317 /* 318 * Keep processing tags while a tag header will still fit. 319 */ 320 while((const char*)(pt + 1) <= end) { 321 /* 322 * If the tag data would go past the end of the packet, abort. 323 */ 324 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 325 if (ptn > end) { 326 CTR2(KTR_NET, "%20s: invalid length for tag %d", 327 __func__, idx); 328 return (NULL); 329 } 330 if (pt->tag_type == idx) { 331 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); 332 return (pt); 333 } 334 335 pt = (const struct pppoe_tag*)ptn; 336 } 337 338 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); 339 return (NULL); 340 } 341 342 /************************************************************************** 343 * Inlines to initialise or add tags to a session's tag list. 344 **************************************************************************/ 345 /* 346 * Initialise the session's tag list. 347 */ 348 static void 349 init_tags(sessp sp) 350 { 351 KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); 352 sp->neg->numtags = 0; 353 } 354 355 static void 356 insert_tag(sessp sp, const struct pppoe_tag *tp) 357 { 358 negp neg = sp->neg; 359 int i; 360 361 KASSERT(neg != NULL, ("%s: no neg", __func__)); 362 if ((i = neg->numtags++) < NUMTAGS) { 363 neg->tags[i] = tp; 364 } else { 365 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " 366 "packet\n"); 367 neg->numtags--; 368 } 369 } 370 371 /* 372 * Make up a packet, using the tags filled out for the session. 373 * 374 * Assume that the actual pppoe header and ethernet header 375 * 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 */ 379 static void 380 make_packet(sessp sp) { 381 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 382 const struct pppoe_tag **tag; 383 char *dp; 384 int count; 385 int tlen; 386 uint16_t length = 0; 387 388 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), 389 ("%s: called from wrong state", __func__)); 390 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 391 392 dp = (char *)(&wh->ph + 1); 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 log(LOG_NOTICE, "ng_pppoe: tags too long\n"); 399 sp->neg->numtags = count; 400 break; /* XXX chop off what's too long */ 401 } 402 bcopy(*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 * Routines to match a service. * 413 **************************************************************************/ 414 415 /* 416 * Find a hook that has a service string that matches that 417 * we are seeking. For now use a simple string. 418 * In the future we may need something like regexp(). 419 * 420 * Null string is a wildcard (ANY service), according to RFC2516. 421 * And historical FreeBSD wildcard is also "*". 422 */ 423 424 static hook_p 425 pppoe_match_svc(node_p node, const struct pppoe_tag *tag) 426 { 427 const priv_p privp = NG_NODE_PRIVATE(node); 428 sessp sp; 429 430 LIST_FOREACH(sp, &privp->listeners, sessions) { 431 negp neg = sp->neg; 432 433 /* Empty Service-Name matches any service. */ 434 if (neg->service_len == 0) 435 break; 436 437 /* Special case for a blank or "*" service name (wildcard). */ 438 if (neg->service_len == 1 && neg->service.data[0] == '*') 439 break; 440 441 /* If the lengths don't match, that aint it. */ 442 if (neg->service_len != ntohs(tag->tag_len)) 443 continue; 444 445 if (strncmp((const char *)(tag + 1), neg->service.data, 446 ntohs(tag->tag_len)) == 0) 447 break; 448 } 449 CTR3(KTR_NET, "%20s: matched %p for %s", __func__, 450 sp?sp->hook:NULL, (const char *)(tag + 1)); 451 452 return (sp?sp->hook:NULL); 453 } 454 455 /* 456 * Broadcast the PADI packet in m0 to all listening hooks. 457 * This routine is called when a PADI with empty Service-Name 458 * tag is received. Client should receive PADOs with all 459 * available services. 460 */ 461 static int 462 pppoe_broadcast_padi(node_p node, struct mbuf *m0) 463 { 464 const priv_p privp = NG_NODE_PRIVATE(node); 465 sessp sp; 466 int error = 0; 467 468 LIST_FOREACH(sp, &privp->listeners, sessions) { 469 struct mbuf *m; 470 471 m = m_dup(m0, M_NOWAIT); 472 if (m == NULL) 473 return (ENOMEM); 474 NG_SEND_DATA_ONLY(error, sp->hook, m); 475 if (error) 476 return (error); 477 } 478 479 return (0); 480 } 481 482 /* 483 * Find a hook, which name equals to given service. 484 */ 485 static hook_p 486 pppoe_find_svc(node_p node, const char *svc_name, int svc_len) 487 { 488 const priv_p privp = NG_NODE_PRIVATE(node); 489 sessp sp; 490 491 LIST_FOREACH(sp, &privp->listeners, sessions) { 492 negp neg = sp->neg; 493 494 if (neg->service_len == svc_len && 495 strncmp(svc_name, neg->service.data, svc_len) == 0) 496 return (sp->hook); 497 } 498 499 return (NULL); 500 } 501 502 /************************************************************************** 503 * Routines to find a particular session that matches an incoming packet. * 504 **************************************************************************/ 505 /* Find free session and add to hash. */ 506 static uint16_t 507 pppoe_getnewsession(sessp sp) 508 { 509 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 510 static uint16_t pppoe_sid = 1; 511 sessp tsp; 512 uint16_t val, hash; 513 514 restart: 515 /* Atomicity is not needed here as value will be checked. */ 516 val = pppoe_sid++; 517 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ 518 if (val == 0xffff || val == 0x0000) 519 val = pppoe_sid = 1; 520 521 /* Check it isn't already in use. */ 522 hash = SESSHASH(val); 523 mtx_lock(&privp->sesshash[hash].mtx); 524 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { 525 if (tsp->Session_ID == val) 526 break; 527 } 528 if (!tsp) { 529 sp->Session_ID = val; 530 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 531 } 532 mtx_unlock(&privp->sesshash[hash].mtx); 533 if (tsp) 534 goto restart; 535 536 CTR2(KTR_NET, "%20s: new sid %d", __func__, val); 537 538 return (val); 539 } 540 541 /* Add specified session to hash. */ 542 static void 543 pppoe_addsession(sessp sp) 544 { 545 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 546 uint16_t hash = SESSHASH(sp->Session_ID); 547 548 mtx_lock(&privp->sesshash[hash].mtx); 549 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 550 mtx_unlock(&privp->sesshash[hash].mtx); 551 } 552 553 /* Delete specified session from hash. */ 554 static void 555 pppoe_delsession(sessp sp) 556 { 557 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 558 uint16_t hash = SESSHASH(sp->Session_ID); 559 560 mtx_lock(&privp->sesshash[hash].mtx); 561 LIST_REMOVE(sp, sessions); 562 mtx_unlock(&privp->sesshash[hash].mtx); 563 } 564 565 /* Find matching peer/session combination. */ 566 static sessp 567 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) 568 { 569 uint16_t session = ntohs(wh->ph.sid); 570 uint16_t hash = SESSHASH(session); 571 sessp sp = NULL; 572 573 mtx_lock(&privp->sesshash[hash].mtx); 574 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { 575 if (sp->Session_ID == session && 576 bcmp(sp->pkt_hdr.eh.ether_dhost, 577 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { 578 break; 579 } 580 } 581 mtx_unlock(&privp->sesshash[hash].mtx); 582 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, 583 session); 584 585 return (sp); 586 } 587 588 static hook_p 589 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 590 { 591 hook_p hook = NULL; 592 union uniq uniq; 593 594 bcopy(tag + 1, uniq.bytes, sizeof(void *)); 595 /* Cycle through all known hooks. */ 596 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 597 /* Skip any nonsession hook. */ 598 if (NG_HOOK_PRIVATE(hook) == NULL) 599 continue; 600 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 601 break; 602 } 603 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.pointer); 604 605 return (hook); 606 } 607 608 /************************************************************************** 609 * Start of Netgraph entrypoints. * 610 **************************************************************************/ 611 612 /* 613 * Allocate the private data structure and link it with node. 614 */ 615 static int 616 ng_pppoe_constructor(node_p node) 617 { 618 priv_p privp; 619 int i; 620 621 /* Initialize private descriptor. */ 622 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO); 623 624 /* Link structs together; this counts as our one reference to *node. */ 625 NG_NODE_SET_PRIVATE(node, privp); 626 privp->node = node; 627 628 /* Initialize to standard mode. */ 629 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); 630 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 631 632 LIST_INIT(&privp->listeners); 633 for (i = 0; i < SESSHASHSIZE; i++) { 634 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); 635 LIST_INIT(&privp->sesshash[i].head); 636 } 637 638 CTR3(KTR_NET, "%20s: created node [%x] (%p)", 639 __func__, node->nd_ID, node); 640 641 return (0); 642 } 643 644 /* 645 * Give our ok for a hook to be added... 646 * point the hook's private info to the hook structure. 647 * 648 * The following hook names are special: 649 * "ethernet": the hook that should be connected to a NIC. 650 * "debug": copies of data sent out here (when I write the code). 651 * All other hook names need only be unique. (the framework checks this). 652 */ 653 static int 654 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 655 { 656 const priv_p privp = NG_NODE_PRIVATE(node); 657 sessp sp; 658 659 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 660 privp->ethernet_hook = hook; 661 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); 662 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 663 privp->debug_hook = hook; 664 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); 665 } else { 666 /* 667 * Any other unique name is OK. 668 * The infrastructure has already checked that it's unique, 669 * so just allocate it and hook it in. 670 */ 671 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 672 if (sp == NULL) 673 return (ENOMEM); 674 675 NG_HOOK_SET_PRIVATE(hook, sp); 676 sp->hook = hook; 677 } 678 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", 679 __func__, node->nd_ID, node, name, hook); 680 681 return(0); 682 } 683 684 /* 685 * Hook has been added successfully. Request the MAC address of 686 * the underlying Ethernet node. 687 */ 688 static int 689 ng_pppoe_connect(hook_p hook) 690 { 691 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 692 struct ng_mesg *msg; 693 int error; 694 695 if (hook != privp->ethernet_hook) 696 return (0); 697 698 /* 699 * If this is Ethernet hook, then request MAC address 700 * from our downstream. 701 */ 702 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); 703 if (msg == NULL) 704 return (ENOBUFS); 705 706 /* 707 * Our hook and peer hook have HK_INVALID flag set, 708 * so we can't use NG_SEND_MSG_HOOK() macro here. 709 */ 710 NG_SEND_MSG_ID(error, privp->node, msg, 711 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), 712 NG_NODE_ID(privp->node)); 713 714 return (error); 715 } 716 /* 717 * Get a netgraph control message. 718 * Check it is one we understand. If needed, send a response. 719 * We sometimes save the address for an async action later. 720 * Always free the message. 721 */ 722 static int 723 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 724 { 725 priv_p privp = NG_NODE_PRIVATE(node); 726 struct ngpppoe_init_data *ourmsg = NULL; 727 struct ng_mesg *resp = NULL; 728 int error = 0; 729 hook_p hook = NULL; 730 sessp sp = NULL; 731 negp neg = NULL; 732 struct ng_mesg *msg; 733 734 NGI_GET_MSG(item, msg); 735 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", 736 __func__, node->nd_ID, node, msg->header.cmd, 737 msg->header.typecookie); 738 739 /* Deal with message according to cookie and command. */ 740 switch (msg->header.typecookie) { 741 case NGM_PPPOE_COOKIE: 742 switch (msg->header.cmd) { 743 case NGM_PPPOE_CONNECT: 744 case NGM_PPPOE_LISTEN: 745 case NGM_PPPOE_OFFER: 746 case NGM_PPPOE_SERVICE: 747 ourmsg = (struct ngpppoe_init_data *)msg->data; 748 if (msg->header.arglen < sizeof(*ourmsg)) { 749 log(LOG_ERR, "ng_pppoe[%x]: init data too " 750 "small\n", node->nd_ID); 751 LEAVE(EMSGSIZE); 752 } 753 if (msg->header.arglen - sizeof(*ourmsg) > 754 PPPOE_SERVICE_NAME_SIZE) { 755 log(LOG_ERR, "ng_pppoe[%x]: service name " 756 "too big\n", node->nd_ID); 757 LEAVE(EMSGSIZE); 758 } 759 if (msg->header.arglen - sizeof(*ourmsg) < 760 ourmsg->data_len) { 761 log(LOG_ERR, "ng_pppoe[%x]: init data has bad " 762 "length, %d should be %zd\n", node->nd_ID, 763 ourmsg->data_len, 764 msg->header.arglen - sizeof (*ourmsg)); 765 LEAVE(EMSGSIZE); 766 } 767 768 /* Make sure strcmp will terminate safely. */ 769 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 770 771 /* Find hook by name. */ 772 hook = ng_findhook(node, ourmsg->hook); 773 if (hook == NULL) 774 LEAVE(ENOENT); 775 776 sp = NG_HOOK_PRIVATE(hook); 777 if (sp == NULL) 778 LEAVE(EINVAL); 779 780 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 781 /* 782 * Ensure we aren't already listening for this 783 * service. 784 */ 785 if (pppoe_find_svc(node, ourmsg->data, 786 ourmsg->data_len) != NULL) 787 LEAVE(EEXIST); 788 } 789 790 /* 791 * PPPOE_SERVICE advertisements are set up 792 * on sessions that are in PRIMED state. 793 */ 794 if (msg->header.cmd == NGM_PPPOE_SERVICE) 795 break; 796 797 if (sp->state != PPPOE_SNONE) { 798 log(LOG_NOTICE, "ng_pppoe[%x]: Session already " 799 "active\n", node->nd_ID); 800 LEAVE(EISCONN); 801 } 802 803 /* 804 * Set up prototype header. 805 */ 806 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, 807 M_NOWAIT | M_ZERO); 808 809 if (neg == NULL) 810 LEAVE(ENOMEM); 811 812 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 813 if (neg->m == NULL) { 814 free(neg, M_NETGRAPH_PPPOE); 815 LEAVE(ENOBUFS); 816 } 817 neg->m->m_pkthdr.rcvif = NULL; 818 sp->neg = neg; 819 ng_callout_init(&neg->handle); 820 neg->m->m_len = sizeof(struct pppoe_full_hdr); 821 neg->pkt = mtod(neg->m, union packet*); 822 memcpy((void *)&neg->pkt->pkt_header.eh, 823 &privp->eh, sizeof(struct ether_header)); 824 neg->pkt->pkt_header.ph.ver = 0x1; 825 neg->pkt->pkt_header.ph.type = 0x1; 826 neg->pkt->pkt_header.ph.sid = 0x0000; 827 neg->timeout = 0; 828 829 sp->creator = NGI_RETADDR(item); 830 } 831 switch (msg->header.cmd) { 832 case NGM_PPPOE_GET_STATUS: 833 { 834 struct ngpppoestat *stats; 835 836 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 837 if (!resp) 838 LEAVE(ENOMEM); 839 840 stats = (struct ngpppoestat *) resp->data; 841 stats->packets_in = privp->packets_in; 842 stats->packets_out = privp->packets_out; 843 break; 844 } 845 case NGM_PPPOE_CONNECT: 846 { 847 /* 848 * Check the hook exists and is Uninitialised. 849 * Send a PADI request, and start the timeout logic. 850 * Store the originator of this message so we can send 851 * a success of fail message to them later. 852 * Move the session to SINIT. 853 * Set up the session to the correct state and 854 * start it. 855 */ 856 int i, acnlen = 0, acnsep = 0, srvlen; 857 for (i = 0; i < ourmsg->data_len; i++) { 858 if (ourmsg->data[i] == '\\') { 859 acnlen = i; 860 acnsep = 1; 861 break; 862 } 863 } 864 srvlen = ourmsg->data_len - acnlen - acnsep; 865 866 bcopy(ourmsg->data, neg->ac_name.data, acnlen); 867 neg->ac_name_len = acnlen; 868 869 neg->service.hdr.tag_type = PTT_SRV_NAME; 870 neg->service.hdr.tag_len = htons((uint16_t)srvlen); 871 bcopy(ourmsg->data + acnlen + acnsep, 872 neg->service.data, srvlen); 873 neg->service_len = srvlen; 874 pppoe_start(sp); 875 break; 876 } 877 case NGM_PPPOE_LISTEN: 878 /* 879 * Check the hook exists and is Uninitialised. 880 * Install the service matching string. 881 * Store the originator of this message so we can send 882 * a success of fail message to them later. 883 * Move the hook to 'LISTENING' 884 */ 885 neg->service.hdr.tag_type = PTT_SRV_NAME; 886 neg->service.hdr.tag_len = 887 htons((uint16_t)ourmsg->data_len); 888 889 if (ourmsg->data_len) 890 bcopy(ourmsg->data, neg->service.data, 891 ourmsg->data_len); 892 neg->service_len = ourmsg->data_len; 893 neg->pkt->pkt_header.ph.code = PADT_CODE; 894 /* 895 * Wait for PADI packet coming from Ethernet. 896 */ 897 sp->state = PPPOE_LISTENING; 898 LIST_INSERT_HEAD(&privp->listeners, sp, sessions); 899 break; 900 case NGM_PPPOE_OFFER: 901 /* 902 * Check the hook exists and is Uninitialised. 903 * Store the originator of this message so we can send 904 * a success of fail message to them later. 905 * Store the AC-Name given and go to PRIMED. 906 */ 907 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 908 neg->ac_name.hdr.tag_len = 909 htons((uint16_t)ourmsg->data_len); 910 if (ourmsg->data_len) 911 bcopy(ourmsg->data, neg->ac_name.data, 912 ourmsg->data_len); 913 neg->ac_name_len = ourmsg->data_len; 914 neg->pkt->pkt_header.ph.code = PADO_CODE; 915 /* 916 * Wait for PADI packet coming from hook. 917 */ 918 sp->state = PPPOE_PRIMED; 919 break; 920 case NGM_PPPOE_SERVICE: 921 /* 922 * Check the session is primed. 923 * for now just allow ONE service to be advertised. 924 * If you do it twice you just overwrite. 925 */ 926 if (sp->state != PPPOE_PRIMED) { 927 log(LOG_NOTICE, "ng_pppoe[%x]: session not " 928 "primed\n", node->nd_ID); 929 LEAVE(EISCONN); 930 } 931 neg = sp->neg; 932 neg->service.hdr.tag_type = PTT_SRV_NAME; 933 neg->service.hdr.tag_len = 934 htons((uint16_t)ourmsg->data_len); 935 936 if (ourmsg->data_len) 937 bcopy(ourmsg->data, neg->service.data, 938 ourmsg->data_len); 939 neg->service_len = ourmsg->data_len; 940 break; 941 case NGM_PPPOE_SETMODE: 942 { 943 char *s; 944 size_t len; 945 946 if (msg->header.arglen == 0) 947 LEAVE(EINVAL); 948 949 s = (char *)msg->data; 950 len = msg->header.arglen - 1; 951 952 /* Search for matching mode string. */ 953 if (len == strlen(NG_PPPOE_STANDARD) && 954 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { 955 privp->flags = 0; 956 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 957 break; 958 } 959 if (len == strlen(NG_PPPOE_3COM) && 960 (strncmp(NG_PPPOE_3COM, s, len) == 0)) { 961 privp->flags |= COMPAT_3COM; 962 privp->eh.ether_type = 963 ETHERTYPE_PPPOE_3COM_DISC; 964 break; 965 } 966 if (len == strlen(NG_PPPOE_DLINK) && 967 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { 968 privp->flags |= COMPAT_DLINK; 969 break; 970 } 971 error = EINVAL; 972 break; 973 } 974 case NGM_PPPOE_GETMODE: 975 { 976 char *s; 977 size_t len = 0; 978 979 if (privp->flags == 0) 980 len += strlen(NG_PPPOE_STANDARD) + 1; 981 if (privp->flags & COMPAT_3COM) 982 len += strlen(NG_PPPOE_3COM) + 1; 983 if (privp->flags & COMPAT_DLINK) 984 len += strlen(NG_PPPOE_DLINK) + 1; 985 986 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 987 if (resp == NULL) 988 LEAVE(ENOMEM); 989 990 s = (char *)resp->data; 991 if (privp->flags == 0) { 992 len = strlen(NG_PPPOE_STANDARD); 993 strlcpy(s, NG_PPPOE_STANDARD, len + 1); 994 break; 995 } 996 if (privp->flags & COMPAT_3COM) { 997 len = strlen(NG_PPPOE_3COM); 998 strlcpy(s, NG_PPPOE_3COM, len + 1); 999 s += len; 1000 } 1001 if (privp->flags & COMPAT_DLINK) { 1002 if (s != resp->data) 1003 *s++ = '|'; 1004 len = strlen(NG_PPPOE_DLINK); 1005 strlcpy(s, NG_PPPOE_DLINK, len + 1); 1006 } 1007 break; 1008 } 1009 case NGM_PPPOE_SETENADDR: 1010 if (msg->header.arglen != ETHER_ADDR_LEN) 1011 LEAVE(EINVAL); 1012 bcopy(msg->data, &privp->eh.ether_shost, 1013 ETHER_ADDR_LEN); 1014 break; 1015 case NGM_PPPOE_SETMAXP: 1016 if (msg->header.arglen != sizeof(uint16_t)) 1017 LEAVE(EINVAL); 1018 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL; 1019 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t)); 1020 privp->max_payload.data = htons(*((uint16_t *)msg->data)); 1021 break; 1022 default: 1023 LEAVE(EINVAL); 1024 } 1025 break; 1026 case NGM_ETHER_COOKIE: 1027 if (!(msg->header.flags & NGF_RESP)) 1028 LEAVE(EINVAL); 1029 switch (msg->header.cmd) { 1030 case NGM_ETHER_GET_ENADDR: 1031 if (msg->header.arglen != ETHER_ADDR_LEN) 1032 LEAVE(EINVAL); 1033 bcopy(msg->data, &privp->eh.ether_shost, 1034 ETHER_ADDR_LEN); 1035 break; 1036 default: 1037 LEAVE(EINVAL); 1038 } 1039 break; 1040 default: 1041 LEAVE(EINVAL); 1042 } 1043 1044 /* Take care of synchronous response, if any. */ 1045 quit: 1046 CTR2(KTR_NET, "%20s: returning %d", __func__, error); 1047 NG_RESPOND_MSG(error, node, item, resp); 1048 /* Free the message and return. */ 1049 NG_FREE_MSG(msg); 1050 return(error); 1051 } 1052 1053 /* 1054 * Start a client into the first state. A separate function because 1055 * it can be needed if the negotiation times out. 1056 */ 1057 static void 1058 pppoe_start(sessp sp) 1059 { 1060 hook_p hook = sp->hook; 1061 node_p node = NG_HOOK_NODE(hook); 1062 priv_p privp = NG_NODE_PRIVATE(node); 1063 negp neg = sp->neg; 1064 struct { 1065 struct pppoe_tag hdr; 1066 union uniq data; 1067 } __packed uniqtag; 1068 struct mbuf *m0; 1069 int error; 1070 1071 /* 1072 * Kick the state machine into starting up. 1073 */ 1074 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1075 sp->state = PPPOE_SINIT; 1076 /* 1077 * Reset the packet header to broadcast. Since we are 1078 * in a client mode use configured ethertype. 1079 */ 1080 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, 1081 sizeof(struct ether_header)); 1082 neg->pkt->pkt_header.ph.code = PADI_CODE; 1083 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 1084 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 1085 uniqtag.data.pointer = sp; 1086 init_tags(sp); 1087 insert_tag(sp, &uniqtag.hdr); 1088 insert_tag(sp, &neg->service.hdr); 1089 if (privp->max_payload.data != 0) 1090 insert_tag(sp, &privp->max_payload.hdr); 1091 make_packet(sp); 1092 /* 1093 * Send packet and prepare to retransmit it after timeout. 1094 */ 1095 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1096 pppoe_ticker, NULL, 0); 1097 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1098 m0 = m_copypacket(neg->m, M_NOWAIT); 1099 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); 1100 } 1101 1102 static int 1103 send_acname(sessp sp, const struct pppoe_tag *tag) 1104 { 1105 int error, tlen; 1106 struct ng_mesg *msg; 1107 struct ngpppoe_sts *sts; 1108 1109 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1110 1111 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 1112 sizeof(struct ngpppoe_sts), M_NOWAIT); 1113 if (msg == NULL) 1114 return (ENOMEM); 1115 1116 sts = (struct ngpppoe_sts *)msg->data; 1117 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1118 strncpy(sts->hook, (const char *)(tag + 1), tlen); 1119 sts->hook[tlen] = '\0'; 1120 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1121 1122 return (error); 1123 } 1124 1125 static int 1126 send_sessionid(sessp sp) 1127 { 1128 int error; 1129 struct ng_mesg *msg; 1130 1131 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1132 1133 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1134 sizeof(uint16_t), M_NOWAIT); 1135 if (msg == NULL) 1136 return (ENOMEM); 1137 1138 *(uint16_t *)msg->data = sp->Session_ID; 1139 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1140 1141 return (error); 1142 } 1143 1144 static int 1145 send_maxp(sessp sp, const struct pppoe_tag *tag) 1146 { 1147 int error; 1148 struct ng_mesg *msg; 1149 struct ngpppoe_maxp *maxp; 1150 1151 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1152 1153 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, 1154 sizeof(struct ngpppoe_maxp), M_NOWAIT); 1155 if (msg == NULL) 1156 return (ENOMEM); 1157 1158 maxp = (struct ngpppoe_maxp *)msg->data; 1159 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1160 maxp->data = ntohs(((const struct maxptag *)tag)->data); 1161 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1162 1163 return (error); 1164 } 1165 1166 /* 1167 * Receive data from session hook and do something with it. 1168 */ 1169 static int 1170 ng_pppoe_rcvdata(hook_p hook, item_p item) 1171 { 1172 node_p node = NG_HOOK_NODE(hook); 1173 const priv_p privp = NG_NODE_PRIVATE(node); 1174 sessp sp = NG_HOOK_PRIVATE(hook); 1175 struct pppoe_full_hdr *wh; 1176 struct mbuf *m; 1177 int error; 1178 1179 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1180 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1181 1182 NGI_GET_M(item, m); 1183 switch (sp->state) { 1184 case PPPOE_NEWCONNECTED: 1185 case PPPOE_CONNECTED: { 1186 /* 1187 * Remove PPP address and control fields, if any. 1188 * For example, ng_ppp(4) always sends LCP packets 1189 * with address and control fields as required by 1190 * generic PPP. PPPoE is an exception to the rule. 1191 */ 1192 if (m->m_pkthdr.len >= 2) { 1193 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1194 LEAVE(ENOBUFS); 1195 if (mtod(m, u_char *)[0] == 0xff && 1196 mtod(m, u_char *)[1] == 0x03) 1197 m_adj(m, 2); 1198 } 1199 /* 1200 * Bang in a pre-made header, and set the length up 1201 * to be correct. Then send it to the ethernet driver. 1202 */ 1203 M_PREPEND(m, sizeof(*wh), M_NOWAIT); 1204 if (m == NULL) 1205 LEAVE(ENOBUFS); 1206 1207 wh = mtod(m, struct pppoe_full_hdr *); 1208 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1209 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh)); 1210 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m); 1211 privp->packets_out++; 1212 break; 1213 } 1214 case PPPOE_PRIMED: { 1215 struct { 1216 struct pppoe_tag hdr; 1217 union uniq data; 1218 } __packed uniqtag; 1219 const struct pppoe_tag *tag; 1220 struct mbuf *m0; 1221 const struct pppoe_hdr *ph; 1222 negp neg = sp->neg; 1223 uint16_t session; 1224 uint16_t length; 1225 uint8_t code; 1226 1227 /* 1228 * A PADI packet is being returned by the application 1229 * that has set up this hook. This indicates that it 1230 * wants us to offer service. 1231 */ 1232 if (m->m_len < sizeof(*wh)) { 1233 m = m_pullup(m, sizeof(*wh)); 1234 if (m == NULL) 1235 LEAVE(ENOBUFS); 1236 } 1237 wh = mtod(m, struct pppoe_full_hdr *); 1238 ph = &wh->ph; 1239 session = ntohs(wh->ph.sid); 1240 length = ntohs(wh->ph.length); 1241 code = wh->ph.code; 1242 /* Use peers mode in session. */ 1243 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1244 if (code != PADI_CODE) 1245 LEAVE(EINVAL); 1246 ng_uncallout(&neg->handle, node); 1247 1248 /* 1249 * This is the first time we hear 1250 * from the client, so note it's 1251 * unicast address, replacing the 1252 * broadcast address. 1253 */ 1254 bcopy(wh->eh.ether_shost, 1255 neg->pkt->pkt_header.eh.ether_dhost, 1256 ETHER_ADDR_LEN); 1257 sp->state = PPPOE_SOFFER; 1258 neg->timeout = 0; 1259 neg->pkt->pkt_header.ph.code = PADO_CODE; 1260 1261 /* 1262 * Start working out the tags to respond with. 1263 */ 1264 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1265 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1266 uniqtag.data.pointer = sp; 1267 init_tags(sp); 1268 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1269 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1270 insert_tag(sp, tag); /* return service */ 1271 /* 1272 * If we have a NULL service request 1273 * and have an extra service defined in this hook, 1274 * then also add a tag for the extra service. 1275 * XXX this is a hack. eventually we should be able 1276 * to support advertising many services, not just one 1277 */ 1278 if (((tag == NULL) || (tag->tag_len == 0)) && 1279 (neg->service.hdr.tag_len != 0)) { 1280 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1281 } 1282 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1283 insert_tag(sp, tag); /* returned hostunique */ 1284 insert_tag(sp, &uniqtag.hdr); 1285 scan_tags(sp, ph); 1286 make_packet(sp); 1287 /* 1288 * Send the offer but if they don't respond 1289 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1290 */ 1291 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1292 pppoe_ticker, NULL, 0); 1293 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1294 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1295 privp->packets_out++; 1296 break; 1297 } 1298 1299 /* 1300 * Packets coming from the hook make no sense 1301 * to sessions in the rest of states. Throw them away. 1302 */ 1303 default: 1304 LEAVE(ENETUNREACH); 1305 } 1306 quit: 1307 if (item) 1308 NG_FREE_ITEM(item); 1309 NG_FREE_M(m); 1310 return (error); 1311 } 1312 1313 /* 1314 * Receive data from ether and do something with it. 1315 */ 1316 static int 1317 ng_pppoe_rcvdata_ether(hook_p hook, item_p item) 1318 { 1319 node_p node = NG_HOOK_NODE(hook); 1320 const priv_p privp = NG_NODE_PRIVATE(node); 1321 sessp sp; 1322 const struct pppoe_tag *utag = NULL, *tag = NULL; 1323 const struct pppoe_full_hdr *wh; 1324 const struct pppoe_hdr *ph; 1325 negp neg = NULL; 1326 struct mbuf *m; 1327 hook_p sendhook; 1328 int error = 0; 1329 uint16_t session; 1330 uint16_t length; 1331 uint8_t code; 1332 struct mbuf *m0; 1333 1334 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1335 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1336 1337 NGI_GET_M(item, m); 1338 /* 1339 * Dig out various fields from the packet. 1340 * Use them to decide where to send it. 1341 */ 1342 privp->packets_in++; 1343 if( m->m_len < sizeof(*wh)) { 1344 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1345 if (m == NULL) { 1346 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " 1347 "m_pullup(wh)\n", node->nd_ID); 1348 LEAVE(ENOBUFS); 1349 } 1350 } 1351 wh = mtod(m, struct pppoe_full_hdr *); 1352 length = ntohs(wh->ph.length); 1353 switch(wh->eh.ether_type) { 1354 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ 1355 case ETHERTYPE_PPPOE_DISC: 1356 /* 1357 * We need to try to make sure that the tag area 1358 * is contiguous, or we could wander off the end 1359 * of a buffer and make a mess. 1360 * (Linux wouldn't have this problem). 1361 */ 1362 if (m->m_pkthdr.len <= MHLEN) { 1363 if( m->m_len < m->m_pkthdr.len) { 1364 m = m_pullup(m, m->m_pkthdr.len); 1365 if (m == NULL) { 1366 log(LOG_NOTICE, "ng_pppoe[%x]: " 1367 "couldn't m_pullup(pkthdr)\n", 1368 node->nd_ID); 1369 LEAVE(ENOBUFS); 1370 } 1371 } 1372 } 1373 if (m->m_len != m->m_pkthdr.len) { 1374 /* 1375 * It's not all in one piece. 1376 * We need to do extra work. 1377 * Put it into a cluster. 1378 */ 1379 struct mbuf *n; 1380 n = m_dup(m, M_NOWAIT); 1381 m_freem(m); 1382 m = n; 1383 if (m) { 1384 /* just check we got a cluster */ 1385 if (m->m_len != m->m_pkthdr.len) { 1386 m_freem(m); 1387 m = NULL; 1388 } 1389 } 1390 if (m == NULL) { 1391 log(LOG_NOTICE, "ng_pppoe[%x]: packet " 1392 "fragmented\n", node->nd_ID); 1393 LEAVE(EMSGSIZE); 1394 } 1395 } 1396 wh = mtod(m, struct pppoe_full_hdr *); 1397 length = ntohs(wh->ph.length); 1398 ph = &wh->ph; 1399 session = ntohs(wh->ph.sid); 1400 code = wh->ph.code; 1401 1402 switch(code) { 1403 case PADI_CODE: 1404 /* 1405 * We are a server: 1406 * Look for a hook with the required service and send 1407 * the ENTIRE packet up there. It should come back to 1408 * a new hook in PRIMED state. Look there for further 1409 * processing. 1410 */ 1411 tag = get_tag(ph, PTT_SRV_NAME); 1412 if (tag == NULL) { 1413 CTR1(KTR_NET, "%20s: PADI w/o Service-Name", 1414 __func__); 1415 LEAVE(ENETUNREACH); 1416 } 1417 1418 /* 1419 * First, try to match Service-Name against our 1420 * listening hooks. If no success and we are in D-Link 1421 * compat mode and Service-Name is empty, then we 1422 * broadcast the PADI to all listening hooks. 1423 */ 1424 sendhook = pppoe_match_svc(node, tag); 1425 if (sendhook != NULL) 1426 NG_FWD_NEW_DATA(error, item, sendhook, m); 1427 else if (privp->flags & COMPAT_DLINK && 1428 ntohs(tag->tag_len) == 0) 1429 error = pppoe_broadcast_padi(node, m); 1430 else 1431 error = ENETUNREACH; 1432 break; 1433 case PADO_CODE: 1434 /* 1435 * We are a client: 1436 * Use the host_uniq tag to find the hook this is in 1437 * response to. Received #2, now send #3 1438 * For now simply accept the first we receive. 1439 */ 1440 utag = get_tag(ph, PTT_HOST_UNIQ); 1441 if ((utag == NULL) || 1442 (ntohs(utag->tag_len) != sizeof(sp))) { 1443 log(LOG_NOTICE, "ng_pppoe[%x]: no host " 1444 "unique field\n", node->nd_ID); 1445 LEAVE(ENETUNREACH); 1446 } 1447 1448 sendhook = pppoe_finduniq(node, utag); 1449 if (sendhook == NULL) { 1450 log(LOG_NOTICE, "ng_pppoe[%x]: no " 1451 "matching session\n", node->nd_ID); 1452 LEAVE(ENETUNREACH); 1453 } 1454 1455 /* 1456 * Check the session is in the right state. 1457 * It needs to be in PPPOE_SINIT. 1458 */ 1459 sp = NG_HOOK_PRIVATE(sendhook); 1460 if (sp->state == PPPOE_SREQ || 1461 sp->state == PPPOE_CONNECTED) { 1462 break; /* Multiple PADO is OK. */ 1463 } 1464 if (sp->state != PPPOE_SINIT) { 1465 log(LOG_NOTICE, "ng_pppoe[%x]: session " 1466 "in wrong state\n", node->nd_ID); 1467 LEAVE(ENETUNREACH); 1468 } 1469 neg = sp->neg; 1470 /* If requested specific AC-name, check it. */ 1471 if (neg->ac_name_len) { 1472 tag = get_tag(ph, PTT_AC_NAME); 1473 if (!tag) { 1474 /* No PTT_AC_NAME in PADO */ 1475 break; 1476 } 1477 if (neg->ac_name_len != htons(tag->tag_len) || 1478 strncmp(neg->ac_name.data, 1479 (const char *)(tag + 1), 1480 neg->ac_name_len) != 0) { 1481 break; 1482 } 1483 } 1484 sp->state = PPPOE_SREQ; 1485 ng_uncallout(&neg->handle, node); 1486 1487 /* 1488 * This is the first time we hear 1489 * from the server, so note it's 1490 * unicast address, replacing the 1491 * broadcast address . 1492 */ 1493 bcopy(wh->eh.ether_shost, 1494 neg->pkt->pkt_header.eh.ether_dhost, 1495 ETHER_ADDR_LEN); 1496 neg->timeout = 0; 1497 neg->pkt->pkt_header.ph.code = PADR_CODE; 1498 init_tags(sp); 1499 insert_tag(sp, utag); /* Host Unique */ 1500 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1501 insert_tag(sp, tag); /* return cookie */ 1502 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1503 insert_tag(sp, tag); /* return it */ 1504 send_acname(sp, tag); 1505 } 1506 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1507 (privp->max_payload.data != 0)) 1508 insert_tag(sp, tag); /* return it */ 1509 insert_tag(sp, &neg->service.hdr); /* Service */ 1510 scan_tags(sp, ph); 1511 make_packet(sp); 1512 sp->state = PPPOE_SREQ; 1513 ng_callout(&neg->handle, node, sp->hook, 1514 PPPOE_INITIAL_TIMEOUT * hz, 1515 pppoe_ticker, NULL, 0); 1516 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1517 m0 = m_copypacket(neg->m, M_NOWAIT); 1518 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1519 break; 1520 case PADR_CODE: 1521 /* 1522 * We are a server: 1523 * Use the ac_cookie tag to find the 1524 * hook this is in response to. 1525 */ 1526 utag = get_tag(ph, PTT_AC_COOKIE); 1527 if ((utag == NULL) || 1528 (ntohs(utag->tag_len) != sizeof(sp))) { 1529 LEAVE(ENETUNREACH); 1530 } 1531 1532 sendhook = pppoe_finduniq(node, utag); 1533 if (sendhook == NULL) 1534 LEAVE(ENETUNREACH); 1535 1536 /* 1537 * Check the session is in the right state. 1538 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. 1539 * If the latter, then this is a retry by the client, 1540 * so be nice, and resend. 1541 */ 1542 sp = NG_HOOK_PRIVATE(sendhook); 1543 if (sp->state == PPPOE_NEWCONNECTED) { 1544 /* 1545 * Whoa! drop back to resend that PADS packet. 1546 * We should still have a copy of it. 1547 */ 1548 sp->state = PPPOE_SOFFER; 1549 } else if (sp->state != PPPOE_SOFFER) 1550 LEAVE (ENETUNREACH); 1551 neg = sp->neg; 1552 ng_uncallout(&neg->handle, node); 1553 neg->pkt->pkt_header.ph.code = PADS_CODE; 1554 if (sp->Session_ID == 0) { 1555 neg->pkt->pkt_header.ph.sid = 1556 htons(pppoe_getnewsession(sp)); 1557 } 1558 send_sessionid(sp); 1559 neg->timeout = 0; 1560 /* 1561 * start working out the tags to respond with. 1562 */ 1563 init_tags(sp); 1564 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1565 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1566 insert_tag(sp, tag);/* return service */ 1567 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1568 insert_tag(sp, tag); /* return it */ 1569 insert_tag(sp, utag); /* ac_cookie */ 1570 scan_tags(sp, ph); 1571 make_packet(sp); 1572 sp->state = PPPOE_NEWCONNECTED; 1573 1574 /* Send the PADS without a timeout - we're now connected. */ 1575 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1576 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1577 1578 /* 1579 * Having sent the last Negotiation header, 1580 * Set up the stored packet header to be correct for 1581 * the actual session. But keep the negotialtion stuff 1582 * around in case we need to resend this last packet. 1583 * We'll discard it when we move from NEWCONNECTED 1584 * to CONNECTED 1585 */ 1586 sp->pkt_hdr = neg->pkt->pkt_header; 1587 /* Configure ethertype depending on what 1588 * ethertype was used at discovery phase */ 1589 if (sp->pkt_hdr.eh.ether_type == 1590 ETHERTYPE_PPPOE_3COM_DISC) 1591 sp->pkt_hdr.eh.ether_type 1592 = ETHERTYPE_PPPOE_3COM_SESS; 1593 else 1594 sp->pkt_hdr.eh.ether_type 1595 = ETHERTYPE_PPPOE_SESS; 1596 sp->pkt_hdr.ph.code = 0; 1597 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1598 break; 1599 case PADS_CODE: 1600 /* 1601 * We are a client: 1602 * Use the host_uniq tag to find the hook this is in 1603 * response to. Take the session ID and store it away. 1604 * Also make sure the pre-made header is correct and 1605 * set us into Session mode. 1606 */ 1607 utag = get_tag(ph, PTT_HOST_UNIQ); 1608 if ((utag == NULL) || 1609 (ntohs(utag->tag_len) != sizeof(sp))) { 1610 LEAVE (ENETUNREACH); 1611 } 1612 sendhook = pppoe_finduniq(node, utag); 1613 if (sendhook == NULL) 1614 LEAVE(ENETUNREACH); 1615 1616 /* 1617 * Check the session is in the right state. 1618 * It needs to be in PPPOE_SREQ. 1619 */ 1620 sp = NG_HOOK_PRIVATE(sendhook); 1621 if (sp->state != PPPOE_SREQ) 1622 LEAVE(ENETUNREACH); 1623 neg = sp->neg; 1624 ng_uncallout(&neg->handle, node); 1625 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1626 sp->Session_ID = ntohs(wh->ph.sid); 1627 pppoe_addsession(sp); 1628 send_sessionid(sp); 1629 neg->timeout = 0; 1630 sp->state = PPPOE_CONNECTED; 1631 /* 1632 * Now we have gone to Connected mode, 1633 * Free all resources needed for negotiation. 1634 * Keep a copy of the header we will be using. 1635 */ 1636 sp->pkt_hdr = neg->pkt->pkt_header; 1637 if (privp->flags & COMPAT_3COM) 1638 sp->pkt_hdr.eh.ether_type 1639 = ETHERTYPE_PPPOE_3COM_SESS; 1640 else 1641 sp->pkt_hdr.eh.ether_type 1642 = ETHERTYPE_PPPOE_SESS; 1643 sp->pkt_hdr.ph.code = 0; 1644 m_freem(neg->m); 1645 free(sp->neg, M_NETGRAPH_PPPOE); 1646 sp->neg = NULL; 1647 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1648 (privp->max_payload.data != 0)) 1649 send_maxp(sp, tag); 1650 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1651 break; 1652 case PADT_CODE: 1653 /* 1654 * Find matching peer/session combination. 1655 */ 1656 sp = pppoe_findsession(privp, wh); 1657 if (sp == NULL) 1658 LEAVE(ENETUNREACH); 1659 /* Disconnect that hook. */ 1660 ng_rmhook_self(sp->hook); 1661 break; 1662 default: 1663 LEAVE(EPFNOSUPPORT); 1664 } 1665 break; 1666 case ETHERTYPE_PPPOE_3COM_SESS: 1667 case ETHERTYPE_PPPOE_SESS: 1668 /* 1669 * Find matching peer/session combination. 1670 */ 1671 sp = pppoe_findsession(privp, wh); 1672 if (sp == NULL) 1673 LEAVE (ENETUNREACH); 1674 m_adj(m, sizeof(*wh)); 1675 1676 /* If packet too short, dump it. */ 1677 if (m->m_pkthdr.len < length) 1678 LEAVE(EMSGSIZE); 1679 /* Also need to trim excess at the end */ 1680 if (m->m_pkthdr.len > length) { 1681 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1682 } 1683 if ( sp->state != PPPOE_CONNECTED) { 1684 if (sp->state == PPPOE_NEWCONNECTED) { 1685 sp->state = PPPOE_CONNECTED; 1686 /* 1687 * Now we have gone to Connected mode, 1688 * Free all resources needed for negotiation. 1689 * Be paranoid about whether there may be 1690 * a timeout. 1691 */ 1692 m_freem(sp->neg->m); 1693 ng_uncallout(&sp->neg->handle, node); 1694 free(sp->neg, M_NETGRAPH_PPPOE); 1695 sp->neg = NULL; 1696 } else { 1697 LEAVE (ENETUNREACH); 1698 } 1699 } 1700 NG_FWD_NEW_DATA(error, item, sp->hook, m); 1701 break; 1702 default: 1703 LEAVE(EPFNOSUPPORT); 1704 } 1705 quit: 1706 if (item) 1707 NG_FREE_ITEM(item); 1708 NG_FREE_M(m); 1709 return (error); 1710 } 1711 1712 /* 1713 * Receive data from debug hook and bypass it to ether. 1714 */ 1715 static int 1716 ng_pppoe_rcvdata_debug(hook_p hook, item_p item) 1717 { 1718 node_p node = NG_HOOK_NODE(hook); 1719 const priv_p privp = NG_NODE_PRIVATE(node); 1720 int error; 1721 1722 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1723 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1724 1725 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); 1726 privp->packets_out++; 1727 return (error); 1728 } 1729 1730 /* 1731 * Do local shutdown processing.. 1732 * If we are a persistent device, we might refuse to go away, and 1733 * we'd only remove our links and reset ourself. 1734 */ 1735 static int 1736 ng_pppoe_shutdown(node_p node) 1737 { 1738 const priv_p privp = NG_NODE_PRIVATE(node); 1739 int i; 1740 1741 for (i = 0; i < SESSHASHSIZE; i++) 1742 mtx_destroy(&privp->sesshash[i].mtx); 1743 NG_NODE_SET_PRIVATE(node, NULL); 1744 NG_NODE_UNREF(privp->node); 1745 free(privp, M_NETGRAPH_PPPOE); 1746 return (0); 1747 } 1748 1749 /* 1750 * Hook disconnection 1751 * 1752 * Clean up all dangling links and information about the session/hook. 1753 * For this type, removal of the last link destroys the node. 1754 */ 1755 static int 1756 ng_pppoe_disconnect(hook_p hook) 1757 { 1758 node_p node = NG_HOOK_NODE(hook); 1759 priv_p privp = NG_NODE_PRIVATE(node); 1760 sessp sp; 1761 1762 if (hook == privp->debug_hook) { 1763 privp->debug_hook = NULL; 1764 } else if (hook == privp->ethernet_hook) { 1765 privp->ethernet_hook = NULL; 1766 if (NG_NODE_IS_VALID(node)) 1767 ng_rmnode_self(node); 1768 } else { 1769 sp = NG_HOOK_PRIVATE(hook); 1770 if (sp->state != PPPOE_SNONE ) { 1771 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1772 } 1773 /* 1774 * According to the spec, if we are connected, 1775 * we should send a DISC packet if we are shutting down 1776 * a session. 1777 */ 1778 if ((privp->ethernet_hook) 1779 && ((sp->state == PPPOE_CONNECTED) 1780 || (sp->state == PPPOE_NEWCONNECTED))) { 1781 struct mbuf *m; 1782 1783 /* Generate a packet of that type. */ 1784 MGETHDR(m, M_NOWAIT, MT_DATA); 1785 if (m == NULL) 1786 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1787 "mbufs\n", node->nd_ID); 1788 else { 1789 struct pppoe_full_hdr *wh; 1790 struct pppoe_tag *tag; 1791 int msglen = strlen(SIGNOFF); 1792 int error = 0; 1793 1794 m->m_pkthdr.rcvif = NULL; 1795 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1796 wh = mtod(m, struct pppoe_full_hdr *); 1797 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1798 1799 /* Revert the stored header to DISC/PADT mode. */ 1800 wh->ph.code = PADT_CODE; 1801 /* 1802 * Configure ethertype depending on what 1803 * was used during sessions stage. 1804 */ 1805 if (wh->eh.ether_type == 1806 ETHERTYPE_PPPOE_3COM_SESS) 1807 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1808 else 1809 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1810 /* 1811 * Add a General error message and adjust 1812 * sizes. 1813 */ 1814 tag = (void *)(&wh->ph + 1); 1815 tag->tag_type = PTT_GEN_ERR; 1816 tag->tag_len = htons((u_int16_t)msglen); 1817 strncpy((char *)(tag + 1), SIGNOFF, msglen); 1818 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1819 msglen); 1820 wh->ph.length = htons(sizeof(*tag) + msglen); 1821 NG_SEND_DATA_ONLY(error, 1822 privp->ethernet_hook, m); 1823 } 1824 } 1825 if (sp->state == PPPOE_LISTENING) 1826 LIST_REMOVE(sp, sessions); 1827 else if (sp->Session_ID) 1828 pppoe_delsession(sp); 1829 /* 1830 * As long as we have somewhere to store the timeout handle, 1831 * we may have a timeout pending.. get rid of it. 1832 */ 1833 if (sp->neg) { 1834 ng_uncallout(&sp->neg->handle, node); 1835 if (sp->neg->m) 1836 m_freem(sp->neg->m); 1837 free(sp->neg, M_NETGRAPH_PPPOE); 1838 } 1839 free(sp, M_NETGRAPH_PPPOE); 1840 NG_HOOK_SET_PRIVATE(hook, NULL); 1841 } 1842 if ((NG_NODE_NUMHOOKS(node) == 0) && 1843 (NG_NODE_IS_VALID(node))) 1844 ng_rmnode_self(node); 1845 return (0); 1846 } 1847 1848 /* 1849 * Timeouts come here. 1850 */ 1851 static void 1852 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 1853 { 1854 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1855 sessp sp = NG_HOOK_PRIVATE(hook); 1856 negp neg = sp->neg; 1857 struct mbuf *m0 = NULL; 1858 int error = 0; 1859 1860 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", 1861 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); 1862 switch(sp->state) { 1863 /* 1864 * Resend the last packet, using an exponential backoff. 1865 * After a period of time, stop growing the backoff, 1866 * And either leave it, or revert to the start. 1867 */ 1868 case PPPOE_SINIT: 1869 case PPPOE_SREQ: 1870 /* Timeouts on these produce resends. */ 1871 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1872 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1873 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 1874 pppoe_ticker, NULL, 0); 1875 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1876 if (sp->state == PPPOE_SREQ) { 1877 /* Revert to SINIT mode. */ 1878 pppoe_start(sp); 1879 } else { 1880 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1881 } 1882 } 1883 break; 1884 case PPPOE_PRIMED: 1885 case PPPOE_SOFFER: 1886 /* A timeout on these says "give up" */ 1887 ng_rmhook_self(hook); 1888 break; 1889 default: 1890 /* Timeouts have no meaning in other states. */ 1891 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", 1892 node->nd_ID); 1893 } 1894 } 1895 1896 /* 1897 * Parse an incoming packet to see if any tags should be copied to the 1898 * output packet. Don't do any tags that have been handled in the main 1899 * state machine. 1900 */ 1901 static const struct pppoe_tag* 1902 scan_tags(sessp sp, const struct pppoe_hdr* ph) 1903 { 1904 const char *const end = (const char *)next_tag(ph); 1905 const char *ptn; 1906 const struct pppoe_tag *pt = (const void *)(ph + 1); 1907 1908 /* 1909 * Keep processing tags while a tag header will still fit. 1910 */ 1911 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1912 1913 while((const char*)(pt + 1) <= end) { 1914 /* 1915 * If the tag data would go past the end of the packet, abort. 1916 */ 1917 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1918 if(ptn > end) 1919 return NULL; 1920 1921 switch (pt->tag_type) { 1922 case PTT_RELAY_SID: 1923 insert_tag(sp, pt); 1924 break; 1925 case PTT_EOL: 1926 return NULL; 1927 case PTT_SRV_NAME: 1928 case PTT_AC_NAME: 1929 case PTT_HOST_UNIQ: 1930 case PTT_AC_COOKIE: 1931 case PTT_VENDOR: 1932 case PTT_SRV_ERR: 1933 case PTT_SYS_ERR: 1934 case PTT_GEN_ERR: 1935 case PTT_MAX_PAYL: 1936 break; 1937 } 1938 pt = (const struct pppoe_tag*)ptn; 1939 } 1940 return NULL; 1941 } 1942 1943 static int 1944 pppoe_send_event(sessp sp, enum cmd cmdid) 1945 { 1946 int error; 1947 struct ng_mesg *msg; 1948 struct ngpppoe_sts *sts; 1949 1950 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1951 1952 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1953 sizeof(struct ngpppoe_sts), M_NOWAIT); 1954 if (msg == NULL) 1955 return (ENOMEM); 1956 sts = (struct ngpppoe_sts *)msg->data; 1957 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1958 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1959 return (error); 1960 }
Cache object: 15adace64f3b01654308cd679d14b2d6
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