1 /* 2 * ng_pppoe.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 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/epoch.h> 52 #include <sys/syslog.h> 53 #include <net/ethernet.h> 54 55 #include <netgraph/ng_message.h> 56 #include <netgraph/netgraph.h> 57 #include <netgraph/ng_parse.h> 58 #include <netgraph/ng_pppoe.h> 59 #include <netgraph/ng_ether.h> 60 61 #ifdef NG_SEPARATE_MALLOC 62 static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 63 #else 64 #define M_NETGRAPH_PPPOE M_NETGRAPH 65 #endif 66 67 #define SIGNOFF "session closed" 68 69 /* 70 * This section contains the netgraph method declarations for the 71 * pppoe node. These methods define the netgraph pppoe 'type'. 72 */ 73 74 static ng_constructor_t ng_pppoe_constructor; 75 static ng_rcvmsg_t ng_pppoe_rcvmsg; 76 static ng_shutdown_t ng_pppoe_shutdown; 77 static ng_newhook_t ng_pppoe_newhook; 78 static ng_connect_t ng_pppoe_connect; 79 static ng_rcvdata_t ng_pppoe_rcvdata; 80 static ng_rcvdata_t ng_pppoe_rcvdata_ether; 81 static ng_rcvdata_t ng_pppoe_rcvdata_debug; 82 static ng_disconnect_t ng_pppoe_disconnect; 83 84 /* Parse type for struct ngpppoe_init_data */ 85 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 86 = NG_PPPOE_INIT_DATA_TYPE_INFO; 87 static const struct ng_parse_type ngpppoe_init_data_state_type = { 88 &ng_parse_struct_type, 89 &ngpppoe_init_data_type_fields 90 }; 91 92 /* Parse type for struct ngpppoe_sts */ 93 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 94 = NG_PPPOE_STS_TYPE_INFO; 95 static const struct ng_parse_type ng_pppoe_sts_state_type = { 96 &ng_parse_struct_type, 97 &ng_pppoe_sts_type_fields 98 }; 99 100 /* List of commands and how to convert arguments to/from ASCII */ 101 static const struct ng_cmdlist ng_pppoe_cmds[] = { 102 { 103 NGM_PPPOE_COOKIE, 104 NGM_PPPOE_CONNECT, 105 "pppoe_connect", 106 &ngpppoe_init_data_state_type, 107 NULL 108 }, 109 { 110 NGM_PPPOE_COOKIE, 111 NGM_PPPOE_LISTEN, 112 "pppoe_listen", 113 &ngpppoe_init_data_state_type, 114 NULL 115 }, 116 { 117 NGM_PPPOE_COOKIE, 118 NGM_PPPOE_OFFER, 119 "pppoe_offer", 120 &ngpppoe_init_data_state_type, 121 NULL 122 }, 123 { 124 NGM_PPPOE_COOKIE, 125 NGM_PPPOE_SERVICE, 126 "pppoe_service", 127 &ngpppoe_init_data_state_type, 128 NULL 129 }, 130 { 131 NGM_PPPOE_COOKIE, 132 NGM_PPPOE_SUCCESS, 133 "pppoe_success", 134 &ng_pppoe_sts_state_type, 135 NULL 136 }, 137 { 138 NGM_PPPOE_COOKIE, 139 NGM_PPPOE_FAIL, 140 "pppoe_fail", 141 &ng_pppoe_sts_state_type, 142 NULL 143 }, 144 { 145 NGM_PPPOE_COOKIE, 146 NGM_PPPOE_CLOSE, 147 "pppoe_close", 148 &ng_pppoe_sts_state_type, 149 NULL 150 }, 151 { 152 NGM_PPPOE_COOKIE, 153 NGM_PPPOE_SETMODE, 154 "pppoe_setmode", 155 &ng_parse_string_type, 156 NULL 157 }, 158 { 159 NGM_PPPOE_COOKIE, 160 NGM_PPPOE_GETMODE, 161 "pppoe_getmode", 162 NULL, 163 &ng_parse_string_type 164 }, 165 { 166 NGM_PPPOE_COOKIE, 167 NGM_PPPOE_SETENADDR, 168 "setenaddr", 169 &ng_parse_enaddr_type, 170 NULL 171 }, 172 { 173 NGM_PPPOE_COOKIE, 174 NGM_PPPOE_SETMAXP, 175 "setmaxp", 176 &ng_parse_uint16_type, 177 NULL 178 }, 179 { 180 NGM_PPPOE_COOKIE, 181 NGM_PPPOE_SEND_HURL, 182 "send_hurl", 183 &ngpppoe_init_data_state_type, 184 NULL 185 }, 186 { 187 NGM_PPPOE_COOKIE, 188 NGM_PPPOE_SEND_MOTM, 189 "send_motm", 190 &ngpppoe_init_data_state_type, 191 NULL 192 }, 193 { 0 } 194 }; 195 196 /* Netgraph node type descriptor */ 197 static struct ng_type typestruct = { 198 .version = NG_ABI_VERSION, 199 .name = NG_PPPOE_NODE_TYPE, 200 .constructor = ng_pppoe_constructor, 201 .rcvmsg = ng_pppoe_rcvmsg, 202 .shutdown = ng_pppoe_shutdown, 203 .newhook = ng_pppoe_newhook, 204 .connect = ng_pppoe_connect, 205 .rcvdata = ng_pppoe_rcvdata, 206 .disconnect = ng_pppoe_disconnect, 207 .cmdlist = ng_pppoe_cmds, 208 }; 209 NETGRAPH_INIT(pppoe, &typestruct); 210 211 /* 212 * States for the session state machine. 213 * These have no meaning if there is no hook attached yet. 214 */ 215 enum state { 216 PPPOE_SNONE=0, /* [both] Initial state */ 217 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 218 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 219 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 220 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 221 PPPOE_SREQ, /* [Client] Sent a Request */ 222 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 223 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 224 PPPOE_DEAD /* [Both] */ 225 }; 226 227 #define NUMTAGS 20 /* number of tags we are set up to work with */ 228 229 /* 230 * Information we store for each hook on each node for negotiating the 231 * session. The mbuf and cluster are freed once negotiation has completed. 232 * The whole negotiation block is then discarded. 233 */ 234 235 struct sess_neg { 236 struct mbuf *m; /* holds cluster with last sent packet */ 237 union packet *pkt; /* points within the above cluster */ 238 struct callout handle; /* see timeout(9) */ 239 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 240 u_int numtags; 241 const struct pppoe_tag *tags[NUMTAGS]; 242 u_int service_len; 243 u_int ac_name_len; 244 u_int host_uniq_len; 245 246 struct datatag service; 247 struct datatag ac_name; 248 struct datatag host_uniq; 249 }; 250 typedef struct sess_neg *negp; 251 252 /* 253 * Session information that is needed after connection. 254 */ 255 struct sess_con { 256 hook_p hook; 257 uint16_t Session_ID; 258 enum state state; 259 ng_ID_t creator; /* who to notify */ 260 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 261 negp neg; /* used when negotiating */ 262 LIST_ENTRY(sess_con) sessions; 263 }; 264 typedef struct sess_con *sessp; 265 266 #define SESSHASHSIZE 0x0100 267 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) 268 269 struct sess_hash_entry { 270 struct mtx mtx; 271 LIST_HEAD(hhead, sess_con) head; 272 }; 273 274 /* 275 * Information we store for each node 276 */ 277 struct PPPoE { 278 node_p node; /* back pointer to node */ 279 hook_p ethernet_hook; 280 hook_p debug_hook; 281 u_int packets_in; /* packets in from ethernet */ 282 u_int packets_out; /* packets out towards ethernet */ 283 uint32_t flags; 284 #define COMPAT_3COM 0x00000001 285 #define COMPAT_DLINK 0x00000002 286 struct ether_header eh; 287 LIST_HEAD(, sess_con) listeners; 288 struct sess_hash_entry sesshash[SESSHASHSIZE]; 289 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */ 290 }; 291 typedef struct PPPoE *priv_p; 292 293 union uniq { 294 char bytes[sizeof(void *)]; 295 void *pointer; 296 }; 297 298 #define LEAVE(x) do { error = x; goto quit; } while(0) 299 static void pppoe_start(sessp sp); 300 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 301 static const struct pppoe_tag *scan_tags(sessp sp, 302 const struct pppoe_hdr* ph); 303 static int pppoe_send_event(sessp sp, enum cmd cmdid); 304 305 /************************************************************************* 306 * Some basic utilities from the Linux version with author's permission.* 307 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 308 ************************************************************************/ 309 310 /* 311 * Return the location where the next tag can be put 312 */ 313 static __inline const struct pppoe_tag* 314 next_tag(const struct pppoe_hdr* ph) 315 { 316 return (const struct pppoe_tag*)(((const char*)(ph + 1)) 317 + ntohs(ph->length)); 318 } 319 320 /* 321 * Look for a tag of a specific type. 322 * Don't trust any length the other end says, 323 * but assume we already sanity checked ph->length. 324 */ 325 static const struct pppoe_tag* 326 get_tag(const struct pppoe_hdr* ph, uint16_t idx) 327 { 328 const char *const end = (const char *)next_tag(ph); 329 const struct pppoe_tag *pt = (const void *)(ph + 1); 330 const char *ptn; 331 332 /* 333 * Keep processing tags while a tag header will still fit. 334 */ 335 while((const char*)(pt + 1) <= end) { 336 /* 337 * If the tag data would go past the end of the packet, abort. 338 */ 339 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 340 if (ptn > end) { 341 CTR2(KTR_NET, "%20s: invalid length for tag %d", 342 __func__, idx); 343 return (NULL); 344 } 345 if (pt->tag_type == idx) { 346 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); 347 return (pt); 348 } 349 350 pt = (const struct pppoe_tag*)ptn; 351 } 352 353 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); 354 return (NULL); 355 } 356 357 /************************************************************************** 358 * Inlines to initialise or add tags to a session's tag list. 359 **************************************************************************/ 360 /* 361 * Initialise the session's tag list. 362 */ 363 static void 364 init_tags(sessp sp) 365 { 366 KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); 367 sp->neg->numtags = 0; 368 } 369 370 static void 371 insert_tag(sessp sp, const struct pppoe_tag *tp) 372 { 373 negp neg = sp->neg; 374 int i; 375 376 KASSERT(neg != NULL, ("%s: no neg", __func__)); 377 if ((i = neg->numtags++) < NUMTAGS) { 378 neg->tags[i] = tp; 379 } else { 380 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " 381 "packet\n"); 382 neg->numtags--; 383 } 384 } 385 386 /* 387 * Make up a packet, using the tags filled out for the session. 388 * 389 * Assume that the actual pppoe header and ethernet header 390 * are filled out externally to this routine. 391 * Also assume that neg->wh points to the correct 392 * location at the front of the buffer space. 393 */ 394 static void 395 make_packet(sessp sp) { 396 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 397 const struct pppoe_tag **tag; 398 char *dp; 399 int count; 400 int tlen; 401 uint16_t length = 0; 402 403 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), 404 ("%s: called from wrong state", __func__)); 405 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 406 407 dp = (char *)(&wh->ph + 1); 408 for (count = 0, tag = sp->neg->tags; 409 ((count < sp->neg->numtags) && (count < NUMTAGS)); 410 tag++, count++) { 411 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 412 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 413 log(LOG_NOTICE, "ng_pppoe: tags too long\n"); 414 sp->neg->numtags = count; 415 break; /* XXX chop off what's too long */ 416 } 417 bcopy(*tag, (char *)dp, tlen); 418 length += tlen; 419 dp += tlen; 420 } 421 wh->ph.length = htons(length); 422 sp->neg->m->m_len = length + sizeof(*wh); 423 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 424 } 425 426 /************************************************************************** 427 * Routines to match a service. * 428 **************************************************************************/ 429 430 /* 431 * Find a hook that has a service string that matches that 432 * we are seeking. For now use a simple string. 433 * In the future we may need something like regexp(). 434 * 435 * Null string is a wildcard (ANY service), according to RFC2516. 436 * And historical FreeBSD wildcard is also "*". 437 */ 438 439 static hook_p 440 pppoe_match_svc(node_p node, const struct pppoe_tag *tag) 441 { 442 const priv_p privp = NG_NODE_PRIVATE(node); 443 sessp sp; 444 445 LIST_FOREACH(sp, &privp->listeners, sessions) { 446 negp neg = sp->neg; 447 448 /* Empty Service-Name matches any service. */ 449 if (neg->service_len == 0) 450 break; 451 452 /* Special case for a blank or "*" service name (wildcard). */ 453 if (neg->service_len == 1 && neg->service.data[0] == '*') 454 break; 455 456 /* If the lengths don't match, that aint it. */ 457 if (neg->service_len != ntohs(tag->tag_len)) 458 continue; 459 460 if (strncmp((const char *)(tag + 1), neg->service.data, 461 ntohs(tag->tag_len)) == 0) 462 break; 463 } 464 CTR3(KTR_NET, "%20s: matched %p for %s", __func__, 465 sp?sp->hook:NULL, (const char *)(tag + 1)); 466 467 return (sp?sp->hook:NULL); 468 } 469 470 /* 471 * Broadcast the PADI packet in m0 to all listening hooks. 472 * This routine is called when a PADI with empty Service-Name 473 * tag is received. Client should receive PADOs with all 474 * available services. 475 */ 476 static int 477 pppoe_broadcast_padi(node_p node, struct mbuf *m0) 478 { 479 const priv_p privp = NG_NODE_PRIVATE(node); 480 sessp sp; 481 int error = 0; 482 483 LIST_FOREACH(sp, &privp->listeners, sessions) { 484 struct mbuf *m; 485 486 m = m_dup(m0, M_NOWAIT); 487 if (m == NULL) 488 return (ENOMEM); 489 NG_SEND_DATA_ONLY(error, sp->hook, m); 490 if (error) 491 return (error); 492 } 493 494 return (0); 495 } 496 497 /* 498 * Find a hook, which name equals to given service. 499 */ 500 static hook_p 501 pppoe_find_svc(node_p node, const char *svc_name, int svc_len) 502 { 503 const priv_p privp = NG_NODE_PRIVATE(node); 504 sessp sp; 505 506 LIST_FOREACH(sp, &privp->listeners, sessions) { 507 negp neg = sp->neg; 508 509 if (neg->service_len == svc_len && 510 strncmp(svc_name, neg->service.data, svc_len) == 0) 511 return (sp->hook); 512 } 513 514 return (NULL); 515 } 516 517 /************************************************************************** 518 * Routines to find a particular session that matches an incoming packet. * 519 **************************************************************************/ 520 /* Find free session and add to hash. */ 521 static uint16_t 522 pppoe_getnewsession(sessp sp) 523 { 524 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 525 static uint16_t pppoe_sid = 1; 526 sessp tsp; 527 uint16_t val, hash; 528 529 restart: 530 /* Atomicity is not needed here as value will be checked. */ 531 val = pppoe_sid++; 532 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ 533 if (val == 0xffff || val == 0x0000) 534 val = pppoe_sid = 1; 535 536 /* Check it isn't already in use. */ 537 hash = SESSHASH(val); 538 mtx_lock(&privp->sesshash[hash].mtx); 539 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { 540 if (tsp->Session_ID == val) 541 break; 542 } 543 if (!tsp) { 544 sp->Session_ID = val; 545 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 546 } 547 mtx_unlock(&privp->sesshash[hash].mtx); 548 if (tsp) 549 goto restart; 550 551 CTR2(KTR_NET, "%20s: new sid %d", __func__, val); 552 553 return (val); 554 } 555 556 /* Add specified session to hash. */ 557 static void 558 pppoe_addsession(sessp sp) 559 { 560 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 561 uint16_t hash = SESSHASH(sp->Session_ID); 562 563 mtx_lock(&privp->sesshash[hash].mtx); 564 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 565 mtx_unlock(&privp->sesshash[hash].mtx); 566 } 567 568 /* Delete specified session from hash. */ 569 static void 570 pppoe_delsession(sessp sp) 571 { 572 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 573 uint16_t hash = SESSHASH(sp->Session_ID); 574 575 mtx_lock(&privp->sesshash[hash].mtx); 576 LIST_REMOVE(sp, sessions); 577 mtx_unlock(&privp->sesshash[hash].mtx); 578 } 579 580 /* Find matching peer/session combination. */ 581 static sessp 582 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) 583 { 584 uint16_t session = ntohs(wh->ph.sid); 585 uint16_t hash = SESSHASH(session); 586 sessp sp = NULL; 587 588 mtx_lock(&privp->sesshash[hash].mtx); 589 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { 590 if (sp->Session_ID == session && 591 bcmp(sp->pkt_hdr.eh.ether_dhost, 592 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { 593 break; 594 } 595 } 596 mtx_unlock(&privp->sesshash[hash].mtx); 597 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, 598 session); 599 600 return (sp); 601 } 602 603 static hook_p 604 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 605 { 606 hook_p hook = NULL; 607 sessp sp; 608 609 /* Cycle through all known hooks. */ 610 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 611 /* Skip any nonsession hook. */ 612 if (NG_HOOK_PRIVATE(hook) == NULL) 613 continue; 614 sp = NG_HOOK_PRIVATE(hook); 615 /* Skip already connected sessions. */ 616 if (sp->neg == NULL) 617 continue; 618 if (sp->neg->host_uniq_len == ntohs(tag->tag_len) && 619 bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1), 620 sp->neg->host_uniq_len) == 0) 621 break; 622 } 623 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp); 624 625 return (hook); 626 } 627 628 static hook_p 629 pppoe_findcookie(node_p node, const struct pppoe_tag *tag) 630 { 631 hook_p hook = NULL; 632 union uniq cookie; 633 634 bcopy(tag + 1, cookie.bytes, sizeof(void *)); 635 /* Cycle through all known hooks. */ 636 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 637 /* Skip any nonsession hook. */ 638 if (NG_HOOK_PRIVATE(hook) == NULL) 639 continue; 640 if (cookie.pointer == NG_HOOK_PRIVATE(hook)) 641 break; 642 } 643 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer); 644 645 return (hook); 646 } 647 648 /************************************************************************** 649 * Start of Netgraph entrypoints. * 650 **************************************************************************/ 651 652 /* 653 * Allocate the private data structure and link it with node. 654 */ 655 static int 656 ng_pppoe_constructor(node_p node) 657 { 658 priv_p privp; 659 int i; 660 661 /* Initialize private descriptor. */ 662 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO); 663 664 /* Link structs together; this counts as our one reference to *node. */ 665 NG_NODE_SET_PRIVATE(node, privp); 666 privp->node = node; 667 668 /* Initialize to standard mode. */ 669 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); 670 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 671 672 LIST_INIT(&privp->listeners); 673 for (i = 0; i < SESSHASHSIZE; i++) { 674 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); 675 LIST_INIT(&privp->sesshash[i].head); 676 } 677 678 CTR3(KTR_NET, "%20s: created node [%x] (%p)", 679 __func__, node->nd_ID, node); 680 681 return (0); 682 } 683 684 /* 685 * Give our ok for a hook to be added... 686 * point the hook's private info to the hook structure. 687 * 688 * The following hook names are special: 689 * "ethernet": the hook that should be connected to a NIC. 690 * "debug": copies of data sent out here (when I write the code). 691 * All other hook names need only be unique. (the framework checks this). 692 */ 693 static int 694 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 695 { 696 const priv_p privp = NG_NODE_PRIVATE(node); 697 sessp sp; 698 699 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 700 privp->ethernet_hook = hook; 701 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); 702 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 703 privp->debug_hook = hook; 704 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); 705 } else { 706 /* 707 * Any other unique name is OK. 708 * The infrastructure has already checked that it's unique, 709 * so just allocate it and hook it in. 710 */ 711 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 712 if (sp == NULL) 713 return (ENOMEM); 714 715 NG_HOOK_SET_PRIVATE(hook, sp); 716 sp->hook = hook; 717 } 718 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", 719 __func__, node->nd_ID, node, name, hook); 720 721 return(0); 722 } 723 724 /* 725 * Hook has been added successfully. Request the MAC address of 726 * the underlying Ethernet node. 727 */ 728 static int 729 ng_pppoe_connect(hook_p hook) 730 { 731 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 732 struct ng_mesg *msg; 733 int error; 734 735 if (hook != privp->ethernet_hook) 736 return (0); 737 738 /* 739 * If this is Ethernet hook, then request MAC address 740 * from our downstream. 741 */ 742 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); 743 if (msg == NULL) 744 return (ENOBUFS); 745 746 /* 747 * Our hook and peer hook have HK_INVALID flag set, 748 * so we can't use NG_SEND_MSG_HOOK() macro here. 749 */ 750 NG_SEND_MSG_ID(error, privp->node, msg, 751 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), 752 NG_NODE_ID(privp->node)); 753 754 return (error); 755 } 756 /* 757 * Get a netgraph control message. 758 * Check it is one we understand. If needed, send a response. 759 * We sometimes save the address for an async action later. 760 * Always free the message. 761 */ 762 static int 763 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 764 { 765 struct epoch_tracker et; 766 priv_p privp = NG_NODE_PRIVATE(node); 767 struct ngpppoe_init_data *ourmsg = NULL; 768 struct ng_mesg *resp = NULL; 769 int error = 0; 770 hook_p hook = NULL; 771 sessp sp = NULL; 772 negp neg = NULL; 773 struct ng_mesg *msg; 774 775 NGI_GET_MSG(item, msg); 776 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", 777 __func__, node->nd_ID, node, msg->header.cmd, 778 msg->header.typecookie); 779 780 /* Deal with message according to cookie and command. */ 781 switch (msg->header.typecookie) { 782 case NGM_PPPOE_COOKIE: 783 switch (msg->header.cmd) { 784 case NGM_PPPOE_CONNECT: 785 case NGM_PPPOE_LISTEN: 786 case NGM_PPPOE_OFFER: 787 case NGM_PPPOE_SERVICE: 788 case NGM_PPPOE_SEND_HURL: 789 case NGM_PPPOE_SEND_MOTM: 790 ourmsg = (struct ngpppoe_init_data *)msg->data; 791 if (msg->header.arglen < sizeof(*ourmsg)) { 792 log(LOG_ERR, "ng_pppoe[%x]: init data too " 793 "small\n", node->nd_ID); 794 LEAVE(EMSGSIZE); 795 } 796 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 797 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 798 if (msg->header.arglen - sizeof(*ourmsg) > 799 PPPOE_PADM_VALUE_SIZE) { 800 log(LOG_ERR, "ng_pppoe[%x]: message " 801 "too big\n", node->nd_ID); 802 LEAVE(EMSGSIZE); 803 } 804 } else { 805 if (msg->header.arglen - sizeof(*ourmsg) > 806 PPPOE_SERVICE_NAME_SIZE) { 807 log(LOG_ERR, "ng_pppoe[%x]: service name " 808 "too big\n", node->nd_ID); 809 LEAVE(EMSGSIZE); 810 } 811 } 812 if (msg->header.arglen - sizeof(*ourmsg) < 813 ourmsg->data_len) { 814 log(LOG_ERR, "ng_pppoe[%x]: init data has bad " 815 "length, %d should be %zd\n", node->nd_ID, 816 ourmsg->data_len, 817 msg->header.arglen - sizeof (*ourmsg)); 818 LEAVE(EMSGSIZE); 819 } 820 821 /* Make sure strcmp will terminate safely. */ 822 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 823 824 /* Find hook by name. */ 825 hook = ng_findhook(node, ourmsg->hook); 826 if (hook == NULL) 827 LEAVE(ENOENT); 828 829 sp = NG_HOOK_PRIVATE(hook); 830 if (sp == NULL) 831 LEAVE(EINVAL); 832 833 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 834 /* 835 * Ensure we aren't already listening for this 836 * service. 837 */ 838 if (pppoe_find_svc(node, ourmsg->data, 839 ourmsg->data_len) != NULL) 840 LEAVE(EEXIST); 841 } 842 843 /* 844 * PPPOE_SERVICE advertisements are set up 845 * on sessions that are in PRIMED state. 846 */ 847 if (msg->header.cmd == NGM_PPPOE_SERVICE) 848 break; 849 850 /* 851 * PADM messages are set up on active sessions. 852 */ 853 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 854 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 855 if (sp->state != PPPOE_NEWCONNECTED && 856 sp->state != PPPOE_CONNECTED) { 857 log(LOG_NOTICE, "ng_pppoe[%x]: session is not " 858 "active\n", node->nd_ID); 859 LEAVE(EISCONN); 860 } 861 break; 862 } 863 864 if (sp->state != PPPOE_SNONE) { 865 log(LOG_NOTICE, "ng_pppoe[%x]: Session already " 866 "active\n", node->nd_ID); 867 LEAVE(EISCONN); 868 } 869 870 /* 871 * Set up prototype header. 872 */ 873 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, 874 M_NOWAIT | M_ZERO); 875 876 if (neg == NULL) 877 LEAVE(ENOMEM); 878 879 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 880 if (neg->m == NULL) { 881 free(neg, M_NETGRAPH_PPPOE); 882 LEAVE(ENOBUFS); 883 } 884 neg->m->m_pkthdr.rcvif = NULL; 885 sp->neg = neg; 886 ng_callout_init(&neg->handle); 887 neg->m->m_len = sizeof(struct pppoe_full_hdr); 888 neg->pkt = mtod(neg->m, union packet*); 889 memcpy((void *)&neg->pkt->pkt_header.eh, 890 &privp->eh, sizeof(struct ether_header)); 891 neg->pkt->pkt_header.ph.ver = 0x1; 892 neg->pkt->pkt_header.ph.type = 0x1; 893 neg->pkt->pkt_header.ph.sid = 0x0000; 894 neg->timeout = 0; 895 896 sp->creator = NGI_RETADDR(item); 897 } 898 switch (msg->header.cmd) { 899 case NGM_PPPOE_GET_STATUS: 900 { 901 struct ngpppoestat *stats; 902 903 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 904 if (!resp) 905 LEAVE(ENOMEM); 906 907 stats = (struct ngpppoestat *) resp->data; 908 stats->packets_in = privp->packets_in; 909 stats->packets_out = privp->packets_out; 910 break; 911 } 912 case NGM_PPPOE_CONNECT: 913 { 914 /* 915 * Check the hook exists and is Uninitialised. 916 * Send a PADI request, and start the timeout logic. 917 * Store the originator of this message so we can send 918 * a success or fail message to them later. 919 * Move the session to SINIT. 920 * Set up the session to the correct state and 921 * start it. 922 */ 923 int acnpos, acnlen = 0, acnsep = 0; 924 int hupos, hulen = 0, husep = 0; 925 int i, srvpos, srvlen; 926 acnpos = 0; 927 for (i = 0; i < ourmsg->data_len; i++) { 928 if (ourmsg->data[i] == '\\') { 929 acnlen = i; 930 acnsep = 1; 931 break; 932 } 933 } 934 hupos = acnlen + acnsep; 935 for (i = hupos; i < ourmsg->data_len; i++) { 936 if (ourmsg->data[i] == '|') { 937 hulen = i - hupos; 938 husep = 1; 939 break; 940 } 941 } 942 srvpos = hupos + hulen + husep; 943 srvlen = ourmsg->data_len - srvpos; 944 945 bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen); 946 neg->ac_name_len = acnlen; 947 948 neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ; 949 if (hulen == 0) { 950 /* Not provided, generate one */ 951 neg->host_uniq.hdr.tag_len = htons(sizeof(sp)); 952 bcopy(&sp, neg->host_uniq.data, sizeof(sp)); 953 neg->host_uniq_len = sizeof(sp); 954 } else if (hulen > 2 && ourmsg->data[hupos] == '0' && 955 ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) { 956 /* Hex encoded */ 957 static const char hexdig[16] = "0123456789abcdef"; 958 int j; 959 960 neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1)); 961 for (i = 0; i < hulen - 2; i++) { 962 for (j = 0; 963 j < 16 && 964 ourmsg->data[hupos + 2 + i] != hexdig[j]; 965 j++); 966 if (j == 16) 967 LEAVE(EINVAL); 968 if (i % 2 == 0) 969 neg->host_uniq.data[i / 2] = j << 4; 970 else 971 neg->host_uniq.data[i / 2] |= j; 972 } 973 neg->host_uniq_len = hulen / 2 - 1; 974 } else { 975 /* Plain string */ 976 neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen); 977 bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen); 978 neg->host_uniq_len = hulen; 979 } 980 981 neg->service.hdr.tag_type = PTT_SRV_NAME; 982 neg->service.hdr.tag_len = htons((uint16_t)srvlen); 983 bcopy(ourmsg->data + srvpos, neg->service.data, srvlen); 984 neg->service_len = srvlen; 985 NET_EPOCH_ENTER(et); 986 pppoe_start(sp); 987 NET_EPOCH_EXIT(et); 988 break; 989 } 990 case NGM_PPPOE_LISTEN: 991 /* 992 * Check the hook exists and is Uninitialised. 993 * Install the service matching string. 994 * Store the originator of this message so we can send 995 * a success or fail message to them later. 996 * Move the hook to 'LISTENING' 997 */ 998 neg->service.hdr.tag_type = PTT_SRV_NAME; 999 neg->service.hdr.tag_len = 1000 htons((uint16_t)ourmsg->data_len); 1001 1002 if (ourmsg->data_len) 1003 bcopy(ourmsg->data, neg->service.data, 1004 ourmsg->data_len); 1005 neg->service_len = ourmsg->data_len; 1006 neg->pkt->pkt_header.ph.code = PADT_CODE; 1007 /* 1008 * Wait for PADI packet coming from Ethernet. 1009 */ 1010 sp->state = PPPOE_LISTENING; 1011 LIST_INSERT_HEAD(&privp->listeners, sp, sessions); 1012 break; 1013 case NGM_PPPOE_OFFER: 1014 /* 1015 * Check the hook exists and is Uninitialised. 1016 * Store the originator of this message so we can send 1017 * a success of fail message to them later. 1018 * Store the AC-Name given and go to PRIMED. 1019 */ 1020 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 1021 neg->ac_name.hdr.tag_len = 1022 htons((uint16_t)ourmsg->data_len); 1023 if (ourmsg->data_len) 1024 bcopy(ourmsg->data, neg->ac_name.data, 1025 ourmsg->data_len); 1026 neg->ac_name_len = ourmsg->data_len; 1027 neg->pkt->pkt_header.ph.code = PADO_CODE; 1028 /* 1029 * Wait for PADI packet coming from hook. 1030 */ 1031 sp->state = PPPOE_PRIMED; 1032 break; 1033 case NGM_PPPOE_SERVICE: 1034 /* 1035 * Check the session is primed. 1036 * for now just allow ONE service to be advertised. 1037 * If you do it twice you just overwrite. 1038 */ 1039 if (sp->state != PPPOE_PRIMED) { 1040 log(LOG_NOTICE, "ng_pppoe[%x]: session not " 1041 "primed\n", node->nd_ID); 1042 LEAVE(EISCONN); 1043 } 1044 neg = sp->neg; 1045 neg->service.hdr.tag_type = PTT_SRV_NAME; 1046 neg->service.hdr.tag_len = 1047 htons((uint16_t)ourmsg->data_len); 1048 1049 if (ourmsg->data_len) 1050 bcopy(ourmsg->data, neg->service.data, 1051 ourmsg->data_len); 1052 neg->service_len = ourmsg->data_len; 1053 break; 1054 case NGM_PPPOE_SETMODE: 1055 { 1056 char *s; 1057 size_t len; 1058 1059 if (msg->header.arglen == 0) 1060 LEAVE(EINVAL); 1061 1062 s = (char *)msg->data; 1063 len = msg->header.arglen - 1; 1064 1065 /* Search for matching mode string. */ 1066 if (len == strlen(NG_PPPOE_STANDARD) && 1067 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { 1068 privp->flags = 0; 1069 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1070 break; 1071 } 1072 if (len == strlen(NG_PPPOE_3COM) && 1073 (strncmp(NG_PPPOE_3COM, s, len) == 0)) { 1074 privp->flags |= COMPAT_3COM; 1075 privp->eh.ether_type = 1076 ETHERTYPE_PPPOE_3COM_DISC; 1077 break; 1078 } 1079 if (len == strlen(NG_PPPOE_DLINK) && 1080 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { 1081 privp->flags |= COMPAT_DLINK; 1082 break; 1083 } 1084 error = EINVAL; 1085 break; 1086 } 1087 case NGM_PPPOE_GETMODE: 1088 { 1089 char *s; 1090 size_t len = 0; 1091 1092 if (privp->flags == 0) 1093 len += strlen(NG_PPPOE_STANDARD) + 1; 1094 if (privp->flags & COMPAT_3COM) 1095 len += strlen(NG_PPPOE_3COM) + 1; 1096 if (privp->flags & COMPAT_DLINK) 1097 len += strlen(NG_PPPOE_DLINK) + 1; 1098 1099 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 1100 if (resp == NULL) 1101 LEAVE(ENOMEM); 1102 1103 s = (char *)resp->data; 1104 if (privp->flags == 0) { 1105 len = strlen(NG_PPPOE_STANDARD); 1106 strlcpy(s, NG_PPPOE_STANDARD, len + 1); 1107 break; 1108 } 1109 if (privp->flags & COMPAT_3COM) { 1110 len = strlen(NG_PPPOE_3COM); 1111 strlcpy(s, NG_PPPOE_3COM, len + 1); 1112 s += len; 1113 } 1114 if (privp->flags & COMPAT_DLINK) { 1115 if (s != resp->data) 1116 *s++ = '|'; 1117 len = strlen(NG_PPPOE_DLINK); 1118 strlcpy(s, NG_PPPOE_DLINK, len + 1); 1119 } 1120 break; 1121 } 1122 case NGM_PPPOE_SETENADDR: 1123 if (msg->header.arglen != ETHER_ADDR_LEN) 1124 LEAVE(EINVAL); 1125 bcopy(msg->data, &privp->eh.ether_shost, 1126 ETHER_ADDR_LEN); 1127 break; 1128 case NGM_PPPOE_SETMAXP: 1129 if (msg->header.arglen != sizeof(uint16_t)) 1130 LEAVE(EINVAL); 1131 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL; 1132 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t)); 1133 privp->max_payload.data = htons(*((uint16_t *)msg->data)); 1134 break; 1135 case NGM_PPPOE_SEND_HURL: 1136 { 1137 struct mbuf *m; 1138 1139 /* Generate a packet of that type. */ 1140 m = m_gethdr(M_NOWAIT, MT_DATA); 1141 if (m == NULL) 1142 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1143 "mbufs\n", node->nd_ID); 1144 else { 1145 struct pppoe_full_hdr *wh; 1146 struct pppoe_tag *tag; 1147 int error = 0; 1148 1149 wh = mtod(m, struct pppoe_full_hdr *); 1150 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1151 1152 /* Revert the stored header to DISC/PADM mode. */ 1153 wh->ph.code = PADM_CODE; 1154 /* 1155 * Configure ethertype depending on what 1156 * was used during sessions stage. 1157 */ 1158 if (wh->eh.ether_type == 1159 ETHERTYPE_PPPOE_3COM_SESS) 1160 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1161 else 1162 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1163 /* 1164 * Add PADM message and adjust sizes. 1165 */ 1166 tag = (void *)(&wh->ph + 1); 1167 tag->tag_type = PTT_HURL; 1168 tag->tag_len = htons(ourmsg->data_len); 1169 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1170 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1171 ourmsg->data_len; 1172 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1173 NET_EPOCH_ENTER(et); 1174 NG_SEND_DATA_ONLY(error, 1175 privp->ethernet_hook, m); 1176 NET_EPOCH_EXIT(et); 1177 } 1178 break; 1179 } 1180 case NGM_PPPOE_SEND_MOTM: 1181 { 1182 struct mbuf *m; 1183 1184 /* Generate a packet of that type. */ 1185 m = m_gethdr(M_NOWAIT, MT_DATA); 1186 if (m == NULL) 1187 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1188 "mbufs\n", node->nd_ID); 1189 else { 1190 struct pppoe_full_hdr *wh; 1191 struct pppoe_tag *tag; 1192 int error = 0; 1193 1194 wh = mtod(m, struct pppoe_full_hdr *); 1195 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1196 1197 /* Revert the stored header to DISC/PADM mode. */ 1198 wh->ph.code = PADM_CODE; 1199 /* 1200 * Configure ethertype depending on what 1201 * was used during sessions stage. 1202 */ 1203 if (wh->eh.ether_type == 1204 ETHERTYPE_PPPOE_3COM_SESS) 1205 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1206 else 1207 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1208 /* 1209 * Add PADM message and adjust sizes. 1210 */ 1211 tag = (void *)(&wh->ph + 1); 1212 tag->tag_type = PTT_MOTM; 1213 tag->tag_len = htons(ourmsg->data_len); 1214 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1215 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1216 ourmsg->data_len; 1217 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1218 NET_EPOCH_ENTER(et); 1219 NG_SEND_DATA_ONLY(error, 1220 privp->ethernet_hook, m); 1221 NET_EPOCH_EXIT(et); 1222 } 1223 break; 1224 } 1225 default: 1226 LEAVE(EINVAL); 1227 } 1228 break; 1229 case NGM_ETHER_COOKIE: 1230 if (!(msg->header.flags & NGF_RESP)) 1231 LEAVE(EINVAL); 1232 switch (msg->header.cmd) { 1233 case NGM_ETHER_GET_ENADDR: 1234 if (msg->header.arglen != ETHER_ADDR_LEN) 1235 LEAVE(EINVAL); 1236 bcopy(msg->data, &privp->eh.ether_shost, 1237 ETHER_ADDR_LEN); 1238 break; 1239 default: 1240 LEAVE(EINVAL); 1241 } 1242 break; 1243 default: 1244 LEAVE(EINVAL); 1245 } 1246 1247 /* Take care of synchronous response, if any. */ 1248 quit: 1249 CTR2(KTR_NET, "%20s: returning %d", __func__, error); 1250 NG_RESPOND_MSG(error, node, item, resp); 1251 /* Free the message and return. */ 1252 NG_FREE_MSG(msg); 1253 return(error); 1254 } 1255 1256 /* 1257 * Start a client into the first state. A separate function because 1258 * it can be needed if the negotiation times out. 1259 */ 1260 static void 1261 pppoe_start(sessp sp) 1262 { 1263 hook_p hook = sp->hook; 1264 node_p node = NG_HOOK_NODE(hook); 1265 priv_p privp = NG_NODE_PRIVATE(node); 1266 negp neg = sp->neg; 1267 struct mbuf *m0; 1268 int error; 1269 1270 /* 1271 * Kick the state machine into starting up. 1272 */ 1273 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1274 sp->state = PPPOE_SINIT; 1275 /* 1276 * Reset the packet header to broadcast. Since we are 1277 * in a client mode use configured ethertype. 1278 */ 1279 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, 1280 sizeof(struct ether_header)); 1281 neg->pkt->pkt_header.ph.code = PADI_CODE; 1282 init_tags(sp); 1283 insert_tag(sp, &neg->host_uniq.hdr); 1284 insert_tag(sp, &neg->service.hdr); 1285 if (privp->max_payload.data != 0) 1286 insert_tag(sp, &privp->max_payload.hdr); 1287 make_packet(sp); 1288 /* 1289 * Send packet and prepare to retransmit it after timeout. 1290 */ 1291 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1292 pppoe_ticker, NULL, 0); 1293 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1294 m0 = m_copypacket(neg->m, M_NOWAIT); 1295 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); 1296 } 1297 1298 static int 1299 send_acname(sessp sp, const struct pppoe_tag *tag) 1300 { 1301 int error, tlen; 1302 struct ng_mesg *msg; 1303 struct ngpppoe_sts *sts; 1304 1305 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1306 1307 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 1308 sizeof(struct ngpppoe_sts), M_NOWAIT); 1309 if (msg == NULL) 1310 return (ENOMEM); 1311 1312 sts = (struct ngpppoe_sts *)msg->data; 1313 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1314 strncpy(sts->hook, (const char *)(tag + 1), tlen); 1315 sts->hook[tlen] = '\0'; 1316 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1317 1318 return (error); 1319 } 1320 1321 static int 1322 send_sessionid(sessp sp) 1323 { 1324 int error; 1325 struct ng_mesg *msg; 1326 1327 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1328 1329 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1330 sizeof(uint16_t), M_NOWAIT); 1331 if (msg == NULL) 1332 return (ENOMEM); 1333 1334 *(uint16_t *)msg->data = sp->Session_ID; 1335 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1336 1337 return (error); 1338 } 1339 1340 static int 1341 send_maxp(sessp sp, const struct pppoe_tag *tag) 1342 { 1343 int error; 1344 struct ng_mesg *msg; 1345 struct ngpppoe_maxp *maxp; 1346 1347 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1348 1349 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, 1350 sizeof(struct ngpppoe_maxp), M_NOWAIT); 1351 if (msg == NULL) 1352 return (ENOMEM); 1353 1354 maxp = (struct ngpppoe_maxp *)msg->data; 1355 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1356 maxp->data = ntohs(((const struct maxptag *)tag)->data); 1357 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1358 1359 return (error); 1360 } 1361 1362 static int 1363 send_hurl(sessp sp, const struct pppoe_tag *tag) 1364 { 1365 int error, tlen; 1366 struct ng_mesg *msg; 1367 struct ngpppoe_padm *padm; 1368 1369 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1370 1371 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL, 1372 sizeof(struct ngpppoe_padm), M_NOWAIT); 1373 if (msg == NULL) 1374 return (ENOMEM); 1375 1376 padm = (struct ngpppoe_padm *)msg->data; 1377 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1378 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1379 padm->msg[tlen] = '\0'; 1380 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1381 1382 return (error); 1383 } 1384 1385 static int 1386 send_motm(sessp sp, const struct pppoe_tag *tag) 1387 { 1388 int error, tlen; 1389 struct ng_mesg *msg; 1390 struct ngpppoe_padm *padm; 1391 1392 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1393 1394 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM, 1395 sizeof(struct ngpppoe_padm), M_NOWAIT); 1396 if (msg == NULL) 1397 return (ENOMEM); 1398 1399 padm = (struct ngpppoe_padm *)msg->data; 1400 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1401 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1402 padm->msg[tlen] = '\0'; 1403 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1404 1405 return (error); 1406 } 1407 1408 /* 1409 * Receive data from session hook and do something with it. 1410 */ 1411 static int 1412 ng_pppoe_rcvdata(hook_p hook, item_p item) 1413 { 1414 node_p node = NG_HOOK_NODE(hook); 1415 const priv_p privp = NG_NODE_PRIVATE(node); 1416 sessp sp = NG_HOOK_PRIVATE(hook); 1417 struct pppoe_full_hdr *wh; 1418 struct mbuf *m; 1419 int error; 1420 1421 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1422 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1423 1424 NGI_GET_M(item, m); 1425 switch (sp->state) { 1426 case PPPOE_NEWCONNECTED: 1427 case PPPOE_CONNECTED: { 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 (mtod(m, u_char *)[0] == 0xff && 1438 mtod(m, u_char *)[1] == 0x03) 1439 m_adj(m, 2); 1440 } 1441 /* 1442 * Bang in a pre-made header, and set the length up 1443 * to be correct. Then send it to the ethernet driver. 1444 */ 1445 M_PREPEND(m, sizeof(*wh), M_NOWAIT); 1446 if (m == NULL) 1447 LEAVE(ENOBUFS); 1448 1449 wh = mtod(m, struct pppoe_full_hdr *); 1450 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1451 wh->ph.length = htons(m->m_pkthdr.len - 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 struct { 1458 struct pppoe_tag hdr; 1459 union uniq data; 1460 } __packed uniqtag; 1461 const struct pppoe_tag *tag; 1462 struct mbuf *m0; 1463 const struct pppoe_hdr *ph; 1464 negp neg = sp->neg; 1465 uint16_t session; 1466 uint16_t length; 1467 uint8_t code; 1468 1469 /* 1470 * A PADI packet is being returned by the application 1471 * that has set up this hook. This indicates that it 1472 * wants us to offer service. 1473 */ 1474 if (m->m_len < sizeof(*wh)) { 1475 m = m_pullup(m, sizeof(*wh)); 1476 if (m == NULL) 1477 LEAVE(ENOBUFS); 1478 } 1479 wh = mtod(m, struct pppoe_full_hdr *); 1480 ph = &wh->ph; 1481 session = ntohs(wh->ph.sid); 1482 length = ntohs(wh->ph.length); 1483 code = wh->ph.code; 1484 /* Use peers mode in session. */ 1485 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1486 if (code != PADI_CODE) 1487 LEAVE(EINVAL); 1488 ng_uncallout(&neg->handle, node); 1489 1490 /* 1491 * This is the first time we hear 1492 * from the client, so note it's 1493 * unicast address, replacing the 1494 * broadcast address. 1495 */ 1496 bcopy(wh->eh.ether_shost, 1497 neg->pkt->pkt_header.eh.ether_dhost, 1498 ETHER_ADDR_LEN); 1499 sp->state = PPPOE_SOFFER; 1500 neg->timeout = 0; 1501 neg->pkt->pkt_header.ph.code = PADO_CODE; 1502 1503 /* 1504 * Start working out the tags to respond with. 1505 */ 1506 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1507 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1508 uniqtag.data.pointer = sp; 1509 init_tags(sp); 1510 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1511 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1512 insert_tag(sp, tag); /* return service */ 1513 /* 1514 * If we have a NULL service request 1515 * and have an extra service defined in this hook, 1516 * then also add a tag for the extra service. 1517 * XXX this is a hack. eventually we should be able 1518 * to support advertising many services, not just one 1519 */ 1520 if (((tag == NULL) || (tag->tag_len == 0)) && 1521 (neg->service.hdr.tag_len != 0)) { 1522 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1523 } 1524 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1525 insert_tag(sp, tag); /* returned hostunique */ 1526 insert_tag(sp, &uniqtag.hdr); 1527 scan_tags(sp, ph); 1528 make_packet(sp); 1529 /* 1530 * Send the offer but if they don't respond 1531 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1532 */ 1533 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1534 pppoe_ticker, NULL, 0); 1535 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1536 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1537 privp->packets_out++; 1538 break; 1539 } 1540 1541 /* 1542 * Packets coming from the hook make no sense 1543 * to sessions in the rest of states. Throw them away. 1544 */ 1545 default: 1546 LEAVE(ENETUNREACH); 1547 } 1548 quit: 1549 if (item) 1550 NG_FREE_ITEM(item); 1551 NG_FREE_M(m); 1552 return (error); 1553 } 1554 1555 /* 1556 * Receive data from ether and do something with it. 1557 */ 1558 static int 1559 ng_pppoe_rcvdata_ether(hook_p hook, item_p item) 1560 { 1561 node_p node = NG_HOOK_NODE(hook); 1562 const priv_p privp = NG_NODE_PRIVATE(node); 1563 sessp sp; 1564 const struct pppoe_tag *utag = NULL, *tag = NULL; 1565 const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 }; 1566 const struct pppoe_full_hdr *wh; 1567 const struct pppoe_hdr *ph; 1568 negp neg = NULL; 1569 struct mbuf *m; 1570 hook_p sendhook; 1571 int error = 0; 1572 uint16_t session; 1573 uint16_t length; 1574 uint8_t code; 1575 struct mbuf *m0; 1576 1577 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1578 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1579 1580 NGI_GET_M(item, m); 1581 /* 1582 * Dig out various fields from the packet. 1583 * Use them to decide where to send it. 1584 */ 1585 privp->packets_in++; 1586 if( m->m_len < sizeof(*wh)) { 1587 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1588 if (m == NULL) { 1589 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " 1590 "m_pullup(wh)\n", node->nd_ID); 1591 LEAVE(ENOBUFS); 1592 } 1593 } 1594 wh = mtod(m, struct pppoe_full_hdr *); 1595 length = ntohs(wh->ph.length); 1596 switch(wh->eh.ether_type) { 1597 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ 1598 case ETHERTYPE_PPPOE_DISC: 1599 /* 1600 * We need to try to make sure that the tag area 1601 * is contiguous, or we could wander off the end 1602 * of a buffer and make a mess. 1603 * (Linux wouldn't have this problem). 1604 */ 1605 if (m->m_pkthdr.len <= MHLEN) { 1606 if( m->m_len < m->m_pkthdr.len) { 1607 m = m_pullup(m, m->m_pkthdr.len); 1608 if (m == NULL) { 1609 log(LOG_NOTICE, "ng_pppoe[%x]: " 1610 "couldn't m_pullup(pkthdr)\n", 1611 node->nd_ID); 1612 LEAVE(ENOBUFS); 1613 } 1614 } 1615 } 1616 if (m->m_len != m->m_pkthdr.len) { 1617 /* 1618 * It's not all in one piece. 1619 * We need to do extra work. 1620 * Put it into a cluster. 1621 */ 1622 struct mbuf *n; 1623 n = m_dup(m, M_NOWAIT); 1624 m_freem(m); 1625 m = n; 1626 if (m) { 1627 /* just check we got a cluster */ 1628 if (m->m_len != m->m_pkthdr.len) { 1629 m_freem(m); 1630 m = NULL; 1631 } 1632 } 1633 if (m == NULL) { 1634 log(LOG_NOTICE, "ng_pppoe[%x]: packet " 1635 "fragmented\n", node->nd_ID); 1636 LEAVE(EMSGSIZE); 1637 } 1638 } 1639 wh = mtod(m, struct pppoe_full_hdr *); 1640 length = ntohs(wh->ph.length); 1641 ph = &wh->ph; 1642 session = ntohs(wh->ph.sid); 1643 code = wh->ph.code; 1644 1645 switch(code) { 1646 case PADI_CODE: 1647 /* 1648 * We are a server: 1649 * Look for a hook with the required service and send 1650 * the ENTIRE packet up there. It should come back to 1651 * a new hook in PRIMED state. Look there for further 1652 * processing. 1653 */ 1654 tag = get_tag(ph, PTT_SRV_NAME); 1655 if (tag == NULL) 1656 tag = &sntag; 1657 1658 /* 1659 * First, try to match Service-Name against our 1660 * listening hooks. If no success and we are in D-Link 1661 * compat mode and Service-Name is empty, then we 1662 * broadcast the PADI to all listening hooks. 1663 */ 1664 sendhook = pppoe_match_svc(node, tag); 1665 if (sendhook != NULL) 1666 NG_FWD_NEW_DATA(error, item, sendhook, m); 1667 else if (privp->flags & COMPAT_DLINK && 1668 ntohs(tag->tag_len) == 0) 1669 error = pppoe_broadcast_padi(node, m); 1670 else 1671 error = ENETUNREACH; 1672 break; 1673 case PADO_CODE: 1674 /* 1675 * We are a client: 1676 * Use the host_uniq tag to find the hook this is in 1677 * response to. Received #2, now send #3 1678 * For now simply accept the first we receive. 1679 */ 1680 utag = get_tag(ph, PTT_HOST_UNIQ); 1681 if (utag == NULL) { 1682 log(LOG_NOTICE, "ng_pppoe[%x]: no host " 1683 "unique field\n", node->nd_ID); 1684 LEAVE(ENETUNREACH); 1685 } 1686 1687 sendhook = pppoe_finduniq(node, utag); 1688 if (sendhook == NULL) { 1689 log(LOG_NOTICE, "ng_pppoe[%x]: no " 1690 "matching session\n", node->nd_ID); 1691 LEAVE(ENETUNREACH); 1692 } 1693 1694 /* 1695 * Check the session is in the right state. 1696 * It needs to be in PPPOE_SINIT. 1697 */ 1698 sp = NG_HOOK_PRIVATE(sendhook); 1699 if (sp->state == PPPOE_SREQ || 1700 sp->state == PPPOE_CONNECTED) { 1701 break; /* Multiple PADO is OK. */ 1702 } 1703 if (sp->state != PPPOE_SINIT) { 1704 log(LOG_NOTICE, "ng_pppoe[%x]: session " 1705 "in wrong state\n", node->nd_ID); 1706 LEAVE(ENETUNREACH); 1707 } 1708 neg = sp->neg; 1709 /* If requested specific AC-name, check it. */ 1710 if (neg->ac_name_len) { 1711 tag = get_tag(ph, PTT_AC_NAME); 1712 if (!tag) { 1713 /* No PTT_AC_NAME in PADO */ 1714 break; 1715 } 1716 if (neg->ac_name_len != htons(tag->tag_len) || 1717 strncmp(neg->ac_name.data, 1718 (const char *)(tag + 1), 1719 neg->ac_name_len) != 0) { 1720 break; 1721 } 1722 } 1723 sp->state = PPPOE_SREQ; 1724 ng_uncallout(&neg->handle, node); 1725 1726 /* 1727 * This is the first time we hear 1728 * from the server, so note it's 1729 * unicast address, replacing the 1730 * broadcast address . 1731 */ 1732 bcopy(wh->eh.ether_shost, 1733 neg->pkt->pkt_header.eh.ether_dhost, 1734 ETHER_ADDR_LEN); 1735 neg->timeout = 0; 1736 neg->pkt->pkt_header.ph.code = PADR_CODE; 1737 init_tags(sp); 1738 insert_tag(sp, utag); /* Host Unique */ 1739 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1740 insert_tag(sp, tag); /* return cookie */ 1741 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1742 insert_tag(sp, tag); /* return it */ 1743 send_acname(sp, tag); 1744 } 1745 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1746 (privp->max_payload.data != 0)) 1747 insert_tag(sp, tag); /* return it */ 1748 insert_tag(sp, &neg->service.hdr); /* Service */ 1749 scan_tags(sp, ph); 1750 make_packet(sp); 1751 sp->state = PPPOE_SREQ; 1752 ng_callout(&neg->handle, node, sp->hook, 1753 PPPOE_INITIAL_TIMEOUT * hz, 1754 pppoe_ticker, NULL, 0); 1755 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1756 m0 = m_copypacket(neg->m, M_NOWAIT); 1757 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1758 break; 1759 case PADR_CODE: 1760 /* 1761 * We are a server: 1762 * Use the ac_cookie tag to find the 1763 * hook this is in response to. 1764 */ 1765 utag = get_tag(ph, PTT_AC_COOKIE); 1766 if ((utag == NULL) || 1767 (ntohs(utag->tag_len) != sizeof(sp))) { 1768 LEAVE(ENETUNREACH); 1769 } 1770 1771 sendhook = pppoe_findcookie(node, utag); 1772 if (sendhook == NULL) 1773 LEAVE(ENETUNREACH); 1774 1775 /* 1776 * Check the session is in the right state. 1777 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. 1778 * If the latter, then this is a retry by the client, 1779 * so be nice, and resend. 1780 */ 1781 sp = NG_HOOK_PRIVATE(sendhook); 1782 if (sp->state == PPPOE_NEWCONNECTED) { 1783 /* 1784 * Whoa! drop back to resend that PADS packet. 1785 * We should still have a copy of it. 1786 */ 1787 sp->state = PPPOE_SOFFER; 1788 } else if (sp->state != PPPOE_SOFFER) 1789 LEAVE (ENETUNREACH); 1790 neg = sp->neg; 1791 ng_uncallout(&neg->handle, node); 1792 neg->pkt->pkt_header.ph.code = PADS_CODE; 1793 if (sp->Session_ID == 0) { 1794 neg->pkt->pkt_header.ph.sid = 1795 htons(pppoe_getnewsession(sp)); 1796 } 1797 send_sessionid(sp); 1798 neg->timeout = 0; 1799 /* 1800 * start working out the tags to respond with. 1801 */ 1802 init_tags(sp); 1803 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1804 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1805 insert_tag(sp, tag);/* return service */ 1806 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1807 insert_tag(sp, tag); /* return it */ 1808 insert_tag(sp, utag); /* ac_cookie */ 1809 scan_tags(sp, ph); 1810 make_packet(sp); 1811 sp->state = PPPOE_NEWCONNECTED; 1812 1813 /* Send the PADS without a timeout - we're now connected. */ 1814 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1815 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1816 1817 /* 1818 * Having sent the last Negotiation header, 1819 * Set up the stored packet header to be correct for 1820 * the actual session. But keep the negotialtion stuff 1821 * around in case we need to resend this last packet. 1822 * We'll discard it when we move from NEWCONNECTED 1823 * to CONNECTED 1824 */ 1825 sp->pkt_hdr = neg->pkt->pkt_header; 1826 /* Configure ethertype depending on what 1827 * ethertype was used at discovery phase */ 1828 if (sp->pkt_hdr.eh.ether_type == 1829 ETHERTYPE_PPPOE_3COM_DISC) 1830 sp->pkt_hdr.eh.ether_type 1831 = ETHERTYPE_PPPOE_3COM_SESS; 1832 else 1833 sp->pkt_hdr.eh.ether_type 1834 = ETHERTYPE_PPPOE_SESS; 1835 sp->pkt_hdr.ph.code = 0; 1836 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1837 break; 1838 case PADS_CODE: 1839 /* 1840 * We are a client: 1841 * Use the host_uniq tag to find the hook this is in 1842 * response to. Take the session ID and store it away. 1843 * Also make sure the pre-made header is correct and 1844 * set us into Session mode. 1845 */ 1846 utag = get_tag(ph, PTT_HOST_UNIQ); 1847 if (utag == NULL) { 1848 LEAVE (ENETUNREACH); 1849 } 1850 sendhook = pppoe_finduniq(node, utag); 1851 if (sendhook == NULL) 1852 LEAVE(ENETUNREACH); 1853 1854 /* 1855 * Check the session is in the right state. 1856 * It needs to be in PPPOE_SREQ. 1857 */ 1858 sp = NG_HOOK_PRIVATE(sendhook); 1859 if (sp->state != PPPOE_SREQ) 1860 LEAVE(ENETUNREACH); 1861 neg = sp->neg; 1862 ng_uncallout(&neg->handle, node); 1863 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1864 sp->Session_ID = ntohs(wh->ph.sid); 1865 pppoe_addsession(sp); 1866 send_sessionid(sp); 1867 neg->timeout = 0; 1868 sp->state = PPPOE_CONNECTED; 1869 /* 1870 * Now we have gone to Connected mode, 1871 * Free all resources needed for negotiation. 1872 * Keep a copy of the header we will be using. 1873 */ 1874 sp->pkt_hdr = neg->pkt->pkt_header; 1875 if (privp->flags & COMPAT_3COM) 1876 sp->pkt_hdr.eh.ether_type 1877 = ETHERTYPE_PPPOE_3COM_SESS; 1878 else 1879 sp->pkt_hdr.eh.ether_type 1880 = ETHERTYPE_PPPOE_SESS; 1881 sp->pkt_hdr.ph.code = 0; 1882 m_freem(neg->m); 1883 free(sp->neg, M_NETGRAPH_PPPOE); 1884 sp->neg = NULL; 1885 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1886 (privp->max_payload.data != 0)) 1887 send_maxp(sp, tag); 1888 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1889 break; 1890 case PADT_CODE: 1891 /* 1892 * Find matching peer/session combination. 1893 */ 1894 sp = pppoe_findsession(privp, wh); 1895 if (sp == NULL) 1896 LEAVE(ENETUNREACH); 1897 /* Disconnect that hook. */ 1898 ng_rmhook_self(sp->hook); 1899 break; 1900 case PADM_CODE: 1901 /* 1902 * We are a client: 1903 * find matching peer/session combination. 1904 */ 1905 sp = pppoe_findsession(privp, wh); 1906 if (sp == NULL) 1907 LEAVE (ENETUNREACH); 1908 if ((tag = get_tag(ph, PTT_HURL))) 1909 send_hurl(sp, tag); 1910 if ((tag = get_tag(ph, PTT_MOTM))) 1911 send_motm(sp, tag); 1912 break; 1913 default: 1914 LEAVE(EPFNOSUPPORT); 1915 } 1916 break; 1917 case ETHERTYPE_PPPOE_3COM_SESS: 1918 case ETHERTYPE_PPPOE_SESS: 1919 /* 1920 * Find matching peer/session combination. 1921 */ 1922 sp = pppoe_findsession(privp, wh); 1923 if (sp == NULL) 1924 LEAVE (ENETUNREACH); 1925 m_adj(m, sizeof(*wh)); 1926 1927 /* If packet too short, dump it. */ 1928 if (m->m_pkthdr.len < length) 1929 LEAVE(EMSGSIZE); 1930 /* Also need to trim excess at the end */ 1931 if (m->m_pkthdr.len > length) { 1932 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1933 } 1934 if ( sp->state != PPPOE_CONNECTED) { 1935 if (sp->state == PPPOE_NEWCONNECTED) { 1936 sp->state = PPPOE_CONNECTED; 1937 /* 1938 * Now we have gone to Connected mode, 1939 * Free all resources needed for negotiation. 1940 * Be paranoid about whether there may be 1941 * a timeout. 1942 */ 1943 m_freem(sp->neg->m); 1944 ng_uncallout(&sp->neg->handle, node); 1945 free(sp->neg, M_NETGRAPH_PPPOE); 1946 sp->neg = NULL; 1947 } else { 1948 LEAVE (ENETUNREACH); 1949 } 1950 } 1951 NG_FWD_NEW_DATA(error, item, sp->hook, m); 1952 break; 1953 default: 1954 LEAVE(EPFNOSUPPORT); 1955 } 1956 quit: 1957 if (item) 1958 NG_FREE_ITEM(item); 1959 NG_FREE_M(m); 1960 return (error); 1961 } 1962 1963 /* 1964 * Receive data from debug hook and bypass it to ether. 1965 */ 1966 static int 1967 ng_pppoe_rcvdata_debug(hook_p hook, item_p item) 1968 { 1969 node_p node = NG_HOOK_NODE(hook); 1970 const priv_p privp = NG_NODE_PRIVATE(node); 1971 int error; 1972 1973 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1974 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1975 1976 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); 1977 privp->packets_out++; 1978 return (error); 1979 } 1980 1981 /* 1982 * Do local shutdown processing.. 1983 * If we are a persistent device, we might refuse to go away, and 1984 * we'd only remove our links and reset ourself. 1985 */ 1986 static int 1987 ng_pppoe_shutdown(node_p node) 1988 { 1989 const priv_p privp = NG_NODE_PRIVATE(node); 1990 int i; 1991 1992 for (i = 0; i < SESSHASHSIZE; i++) 1993 mtx_destroy(&privp->sesshash[i].mtx); 1994 NG_NODE_SET_PRIVATE(node, NULL); 1995 NG_NODE_UNREF(privp->node); 1996 free(privp, M_NETGRAPH_PPPOE); 1997 return (0); 1998 } 1999 2000 /* 2001 * Hook disconnection 2002 * 2003 * Clean up all dangling links and information about the session/hook. 2004 * For this type, removal of the last link destroys the node. 2005 */ 2006 static int 2007 ng_pppoe_disconnect(hook_p hook) 2008 { 2009 node_p node = NG_HOOK_NODE(hook); 2010 priv_p privp = NG_NODE_PRIVATE(node); 2011 sessp sp; 2012 2013 if (hook == privp->debug_hook) { 2014 privp->debug_hook = NULL; 2015 } else if (hook == privp->ethernet_hook) { 2016 privp->ethernet_hook = NULL; 2017 if (NG_NODE_IS_VALID(node)) 2018 ng_rmnode_self(node); 2019 } else { 2020 sp = NG_HOOK_PRIVATE(hook); 2021 if (sp->state != PPPOE_SNONE ) { 2022 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 2023 } 2024 /* 2025 * According to the spec, if we are connected, 2026 * we should send a DISC packet if we are shutting down 2027 * a session. 2028 */ 2029 if ((privp->ethernet_hook) 2030 && ((sp->state == PPPOE_CONNECTED) 2031 || (sp->state == PPPOE_NEWCONNECTED))) { 2032 struct mbuf *m; 2033 2034 /* Generate a packet of that type. */ 2035 m = m_gethdr(M_NOWAIT, MT_DATA); 2036 if (m == NULL) 2037 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 2038 "mbufs\n", node->nd_ID); 2039 else { 2040 struct pppoe_full_hdr *wh; 2041 struct pppoe_tag *tag; 2042 int msglen = strlen(SIGNOFF); 2043 int error = 0; 2044 2045 wh = mtod(m, struct pppoe_full_hdr *); 2046 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 2047 2048 /* Revert the stored header to DISC/PADT mode. */ 2049 wh->ph.code = PADT_CODE; 2050 /* 2051 * Configure ethertype depending on what 2052 * was used during sessions stage. 2053 */ 2054 if (wh->eh.ether_type == 2055 ETHERTYPE_PPPOE_3COM_SESS) 2056 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 2057 else 2058 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 2059 /* 2060 * Add a General error message and adjust 2061 * sizes. 2062 */ 2063 tag = (void *)(&wh->ph + 1); 2064 tag->tag_type = PTT_GEN_ERR; 2065 tag->tag_len = htons((u_int16_t)msglen); 2066 strncpy((char *)(tag + 1), SIGNOFF, msglen); 2067 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 2068 msglen; 2069 wh->ph.length = htons(sizeof(*tag) + msglen); 2070 NG_SEND_DATA_ONLY(error, 2071 privp->ethernet_hook, m); 2072 } 2073 } 2074 if (sp->state == PPPOE_LISTENING) 2075 LIST_REMOVE(sp, sessions); 2076 else if (sp->Session_ID) 2077 pppoe_delsession(sp); 2078 /* 2079 * As long as we have somewhere to store the timeout handle, 2080 * we may have a timeout pending.. get rid of it. 2081 */ 2082 if (sp->neg) { 2083 ng_uncallout(&sp->neg->handle, node); 2084 if (sp->neg->m) 2085 m_freem(sp->neg->m); 2086 free(sp->neg, M_NETGRAPH_PPPOE); 2087 } 2088 free(sp, M_NETGRAPH_PPPOE); 2089 NG_HOOK_SET_PRIVATE(hook, NULL); 2090 } 2091 if ((NG_NODE_NUMHOOKS(node) == 0) && 2092 (NG_NODE_IS_VALID(node))) 2093 ng_rmnode_self(node); 2094 return (0); 2095 } 2096 2097 /* 2098 * Timeouts come here. 2099 */ 2100 static void 2101 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 2102 { 2103 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 2104 sessp sp = NG_HOOK_PRIVATE(hook); 2105 negp neg = sp->neg; 2106 struct mbuf *m0 = NULL; 2107 int error = 0; 2108 2109 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", 2110 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); 2111 switch(sp->state) { 2112 /* 2113 * Resend the last packet, using an exponential backoff. 2114 * After a period of time, stop growing the backoff, 2115 * And either leave it, or revert to the start. 2116 */ 2117 case PPPOE_SINIT: 2118 case PPPOE_SREQ: 2119 /* Timeouts on these produce resends. */ 2120 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 2121 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 2122 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 2123 pppoe_ticker, NULL, 0); 2124 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 2125 if (sp->state == PPPOE_SREQ) { 2126 /* Revert to SINIT mode. */ 2127 pppoe_start(sp); 2128 } else { 2129 neg->timeout = PPPOE_TIMEOUT_LIMIT; 2130 } 2131 } 2132 break; 2133 case PPPOE_PRIMED: 2134 case PPPOE_SOFFER: 2135 /* A timeout on these says "give up" */ 2136 ng_rmhook_self(hook); 2137 break; 2138 default: 2139 /* Timeouts have no meaning in other states. */ 2140 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", 2141 node->nd_ID); 2142 } 2143 } 2144 2145 /* 2146 * Parse an incoming packet to see if any tags should be copied to the 2147 * output packet. Don't do any tags that have been handled in the main 2148 * state machine. 2149 */ 2150 static const struct pppoe_tag* 2151 scan_tags(sessp sp, const struct pppoe_hdr* ph) 2152 { 2153 const char *const end = (const char *)next_tag(ph); 2154 const char *ptn; 2155 const struct pppoe_tag *pt = (const void *)(ph + 1); 2156 2157 /* 2158 * Keep processing tags while a tag header will still fit. 2159 */ 2160 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2161 2162 while((const char*)(pt + 1) <= end) { 2163 /* 2164 * If the tag data would go past the end of the packet, abort. 2165 */ 2166 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 2167 if(ptn > end) 2168 return NULL; 2169 2170 switch (pt->tag_type) { 2171 case PTT_RELAY_SID: 2172 insert_tag(sp, pt); 2173 break; 2174 case PTT_EOL: 2175 return NULL; 2176 case PTT_SRV_NAME: 2177 case PTT_AC_NAME: 2178 case PTT_HOST_UNIQ: 2179 case PTT_AC_COOKIE: 2180 case PTT_VENDOR: 2181 case PTT_SRV_ERR: 2182 case PTT_SYS_ERR: 2183 case PTT_GEN_ERR: 2184 case PTT_MAX_PAYL: 2185 case PTT_HURL: 2186 case PTT_MOTM: 2187 break; 2188 } 2189 pt = (const struct pppoe_tag*)ptn; 2190 } 2191 return NULL; 2192 } 2193 2194 static int 2195 pppoe_send_event(sessp sp, enum cmd cmdid) 2196 { 2197 int error; 2198 struct ng_mesg *msg; 2199 struct ngpppoe_sts *sts; 2200 2201 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2202 2203 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 2204 sizeof(struct ngpppoe_sts), M_NOWAIT); 2205 if (msg == NULL) 2206 return (ENOMEM); 2207 sts = (struct ngpppoe_sts *)msg->data; 2208 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 2209 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 2210 return (error); 2211 } 2212