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/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 { 179 NGM_PPPOE_COOKIE, 180 NGM_PPPOE_SEND_HURL, 181 "send_hurl", 182 &ngpppoe_init_data_state_type, 183 NULL 184 }, 185 { 186 NGM_PPPOE_COOKIE, 187 NGM_PPPOE_SEND_MOTM, 188 "send_motm", 189 &ngpppoe_init_data_state_type, 190 NULL 191 }, 192 { 0 } 193 }; 194 195 /* Netgraph node type descriptor */ 196 static struct ng_type typestruct = { 197 .version = NG_ABI_VERSION, 198 .name = NG_PPPOE_NODE_TYPE, 199 .constructor = ng_pppoe_constructor, 200 .rcvmsg = ng_pppoe_rcvmsg, 201 .shutdown = ng_pppoe_shutdown, 202 .newhook = ng_pppoe_newhook, 203 .connect = ng_pppoe_connect, 204 .rcvdata = ng_pppoe_rcvdata, 205 .disconnect = ng_pppoe_disconnect, 206 .cmdlist = ng_pppoe_cmds, 207 }; 208 NETGRAPH_INIT(pppoe, &typestruct); 209 210 /* 211 * States for the session state machine. 212 * These have no meaning if there is no hook attached yet. 213 */ 214 enum state { 215 PPPOE_SNONE=0, /* [both] Initial state */ 216 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 217 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 218 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 219 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 220 PPPOE_SREQ, /* [Client] Sent a Request */ 221 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 222 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 223 PPPOE_DEAD /* [Both] */ 224 }; 225 226 #define NUMTAGS 20 /* number of tags we are set up to work with */ 227 228 /* 229 * Information we store for each hook on each node for negotiating the 230 * session. The mbuf and cluster are freed once negotiation has completed. 231 * The whole negotiation block is then discarded. 232 */ 233 234 struct sess_neg { 235 struct mbuf *m; /* holds cluster with last sent packet */ 236 union packet *pkt; /* points within the above cluster */ 237 struct callout handle; /* see timeout(9) */ 238 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 239 u_int numtags; 240 const struct pppoe_tag *tags[NUMTAGS]; 241 u_int service_len; 242 u_int ac_name_len; 243 u_int host_uniq_len; 244 245 struct datatag service; 246 struct datatag ac_name; 247 struct datatag host_uniq; 248 }; 249 typedef struct sess_neg *negp; 250 251 /* 252 * Session information that is needed after connection. 253 */ 254 struct sess_con { 255 hook_p hook; 256 uint16_t Session_ID; 257 enum state state; 258 ng_ID_t creator; /* who to notify */ 259 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 260 negp neg; /* used when negotiating */ 261 LIST_ENTRY(sess_con) sessions; 262 }; 263 typedef struct sess_con *sessp; 264 265 #define SESSHASHSIZE 0x0100 266 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) 267 268 struct sess_hash_entry { 269 struct mtx mtx; 270 LIST_HEAD(hhead, sess_con) head; 271 }; 272 273 /* 274 * Information we store for each node 275 */ 276 struct PPPoE { 277 node_p node; /* back pointer to node */ 278 hook_p ethernet_hook; 279 hook_p debug_hook; 280 u_int packets_in; /* packets in from ethernet */ 281 u_int packets_out; /* packets out towards ethernet */ 282 uint32_t flags; 283 #define COMPAT_3COM 0x00000001 284 #define COMPAT_DLINK 0x00000002 285 struct ether_header eh; 286 LIST_HEAD(, sess_con) listeners; 287 struct sess_hash_entry sesshash[SESSHASHSIZE]; 288 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */ 289 }; 290 typedef struct PPPoE *priv_p; 291 292 union uniq { 293 char bytes[sizeof(void *)]; 294 void *pointer; 295 }; 296 297 #define LEAVE(x) do { error = x; goto quit; } while(0) 298 static void pppoe_start(sessp sp); 299 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 300 static const struct pppoe_tag *scan_tags(sessp sp, 301 const struct pppoe_hdr* ph); 302 static int pppoe_send_event(sessp sp, enum cmd cmdid); 303 304 /************************************************************************* 305 * Some basic utilities from the Linux version with author's permission.* 306 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 307 ************************************************************************/ 308 309 /* 310 * Return the location where the next tag can be put 311 */ 312 static __inline const struct pppoe_tag* 313 next_tag(const struct pppoe_hdr* ph) 314 { 315 return (const struct pppoe_tag*)(((const char*)(ph + 1)) 316 + ntohs(ph->length)); 317 } 318 319 /* 320 * Look for a tag of a specific type. 321 * Don't trust any length the other end says, 322 * but assume we already sanity checked ph->length. 323 */ 324 static const struct pppoe_tag* 325 get_tag(const struct pppoe_hdr* ph, uint16_t idx) 326 { 327 const char *const end = (const char *)next_tag(ph); 328 const struct pppoe_tag *pt = (const void *)(ph + 1); 329 const char *ptn; 330 331 /* 332 * Keep processing tags while a tag header will still fit. 333 */ 334 while((const char*)(pt + 1) <= end) { 335 /* 336 * If the tag data would go past the end of the packet, abort. 337 */ 338 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 339 if (ptn > end) { 340 CTR2(KTR_NET, "%20s: invalid length for tag %d", 341 __func__, idx); 342 return (NULL); 343 } 344 if (pt->tag_type == idx) { 345 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); 346 return (pt); 347 } 348 349 pt = (const struct pppoe_tag*)ptn; 350 } 351 352 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); 353 return (NULL); 354 } 355 356 /************************************************************************** 357 * Inlines to initialise or add tags to a session's tag list. 358 **************************************************************************/ 359 /* 360 * Initialise the session's tag list. 361 */ 362 static void 363 init_tags(sessp sp) 364 { 365 KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); 366 sp->neg->numtags = 0; 367 } 368 369 static void 370 insert_tag(sessp sp, const struct pppoe_tag *tp) 371 { 372 negp neg = sp->neg; 373 int i; 374 375 KASSERT(neg != NULL, ("%s: no neg", __func__)); 376 if ((i = neg->numtags++) < NUMTAGS) { 377 neg->tags[i] = tp; 378 } else { 379 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " 380 "packet\n"); 381 neg->numtags--; 382 } 383 } 384 385 /* 386 * Make up a packet, using the tags filled out for the session. 387 * 388 * Assume that the actual pppoe header and ethernet header 389 * are filled out externally to this routine. 390 * Also assume that neg->wh points to the correct 391 * location at the front of the buffer space. 392 */ 393 static void 394 make_packet(sessp sp) { 395 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 396 const struct pppoe_tag **tag; 397 char *dp; 398 int count; 399 int tlen; 400 uint16_t length = 0; 401 402 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), 403 ("%s: called from wrong state", __func__)); 404 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 405 406 dp = (char *)(&wh->ph + 1); 407 for (count = 0, tag = sp->neg->tags; 408 ((count < sp->neg->numtags) && (count < NUMTAGS)); 409 tag++, count++) { 410 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 411 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 412 log(LOG_NOTICE, "ng_pppoe: tags too long\n"); 413 sp->neg->numtags = count; 414 break; /* XXX chop off what's too long */ 415 } 416 bcopy(*tag, (char *)dp, tlen); 417 length += tlen; 418 dp += tlen; 419 } 420 wh->ph.length = htons(length); 421 sp->neg->m->m_len = length + sizeof(*wh); 422 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 423 } 424 425 /************************************************************************** 426 * Routines to match a service. * 427 **************************************************************************/ 428 429 /* 430 * Find a hook that has a service string that matches that 431 * we are seeking. For now use a simple string. 432 * In the future we may need something like regexp(). 433 * 434 * Null string is a wildcard (ANY service), according to RFC2516. 435 * And historical FreeBSD wildcard is also "*". 436 */ 437 438 static hook_p 439 pppoe_match_svc(node_p node, const struct pppoe_tag *tag) 440 { 441 const priv_p privp = NG_NODE_PRIVATE(node); 442 sessp sp; 443 444 LIST_FOREACH(sp, &privp->listeners, sessions) { 445 negp neg = sp->neg; 446 447 /* Empty Service-Name matches any service. */ 448 if (neg->service_len == 0) 449 break; 450 451 /* Special case for a blank or "*" service name (wildcard). */ 452 if (neg->service_len == 1 && neg->service.data[0] == '*') 453 break; 454 455 /* If the lengths don't match, that aint it. */ 456 if (neg->service_len != ntohs(tag->tag_len)) 457 continue; 458 459 if (strncmp((const char *)(tag + 1), neg->service.data, 460 ntohs(tag->tag_len)) == 0) 461 break; 462 } 463 CTR3(KTR_NET, "%20s: matched %p for %s", __func__, 464 sp?sp->hook:NULL, (const char *)(tag + 1)); 465 466 return (sp?sp->hook:NULL); 467 } 468 469 /* 470 * Broadcast the PADI packet in m0 to all listening hooks. 471 * This routine is called when a PADI with empty Service-Name 472 * tag is received. Client should receive PADOs with all 473 * available services. 474 */ 475 static int 476 pppoe_broadcast_padi(node_p node, struct mbuf *m0) 477 { 478 const priv_p privp = NG_NODE_PRIVATE(node); 479 sessp sp; 480 int error = 0; 481 482 LIST_FOREACH(sp, &privp->listeners, sessions) { 483 struct mbuf *m; 484 485 m = m_dup(m0, M_NOWAIT); 486 if (m == NULL) 487 return (ENOMEM); 488 NG_SEND_DATA_ONLY(error, sp->hook, m); 489 if (error) 490 return (error); 491 } 492 493 return (0); 494 } 495 496 /* 497 * Find a hook, which name equals to given service. 498 */ 499 static hook_p 500 pppoe_find_svc(node_p node, const char *svc_name, int svc_len) 501 { 502 const priv_p privp = NG_NODE_PRIVATE(node); 503 sessp sp; 504 505 LIST_FOREACH(sp, &privp->listeners, sessions) { 506 negp neg = sp->neg; 507 508 if (neg->service_len == svc_len && 509 strncmp(svc_name, neg->service.data, svc_len) == 0) 510 return (sp->hook); 511 } 512 513 return (NULL); 514 } 515 516 /************************************************************************** 517 * Routines to find a particular session that matches an incoming packet. * 518 **************************************************************************/ 519 /* Find free session and add to hash. */ 520 static uint16_t 521 pppoe_getnewsession(sessp sp) 522 { 523 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 524 static uint16_t pppoe_sid = 1; 525 sessp tsp; 526 uint16_t val, hash; 527 528 restart: 529 /* Atomicity is not needed here as value will be checked. */ 530 val = pppoe_sid++; 531 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ 532 if (val == 0xffff || val == 0x0000) 533 val = pppoe_sid = 1; 534 535 /* Check it isn't already in use. */ 536 hash = SESSHASH(val); 537 mtx_lock(&privp->sesshash[hash].mtx); 538 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { 539 if (tsp->Session_ID == val) 540 break; 541 } 542 if (!tsp) { 543 sp->Session_ID = val; 544 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 545 } 546 mtx_unlock(&privp->sesshash[hash].mtx); 547 if (tsp) 548 goto restart; 549 550 CTR2(KTR_NET, "%20s: new sid %d", __func__, val); 551 552 return (val); 553 } 554 555 /* Add specified session to hash. */ 556 static void 557 pppoe_addsession(sessp sp) 558 { 559 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 560 uint16_t hash = SESSHASH(sp->Session_ID); 561 562 mtx_lock(&privp->sesshash[hash].mtx); 563 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 564 mtx_unlock(&privp->sesshash[hash].mtx); 565 } 566 567 /* Delete specified session from hash. */ 568 static void 569 pppoe_delsession(sessp sp) 570 { 571 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 572 uint16_t hash = SESSHASH(sp->Session_ID); 573 574 mtx_lock(&privp->sesshash[hash].mtx); 575 LIST_REMOVE(sp, sessions); 576 mtx_unlock(&privp->sesshash[hash].mtx); 577 } 578 579 /* Find matching peer/session combination. */ 580 static sessp 581 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) 582 { 583 uint16_t session = ntohs(wh->ph.sid); 584 uint16_t hash = SESSHASH(session); 585 sessp sp = NULL; 586 587 mtx_lock(&privp->sesshash[hash].mtx); 588 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { 589 if (sp->Session_ID == session && 590 bcmp(sp->pkt_hdr.eh.ether_dhost, 591 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { 592 break; 593 } 594 } 595 mtx_unlock(&privp->sesshash[hash].mtx); 596 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, 597 session); 598 599 return (sp); 600 } 601 602 static hook_p 603 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 604 { 605 hook_p hook = NULL; 606 sessp sp; 607 608 /* Cycle through all known hooks. */ 609 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 610 /* Skip any nonsession hook. */ 611 if (NG_HOOK_PRIVATE(hook) == NULL) 612 continue; 613 sp = NG_HOOK_PRIVATE(hook); 614 /* Skip already connected sessions. */ 615 if (sp->neg == NULL) 616 continue; 617 if (sp->neg->host_uniq_len == ntohs(tag->tag_len) && 618 bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1), 619 sp->neg->host_uniq_len) == 0) 620 break; 621 } 622 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp); 623 624 return (hook); 625 } 626 627 static hook_p 628 pppoe_findcookie(node_p node, const struct pppoe_tag *tag) 629 { 630 hook_p hook = NULL; 631 union uniq cookie; 632 633 bcopy(tag + 1, cookie.bytes, sizeof(void *)); 634 /* Cycle through all known hooks. */ 635 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 636 /* Skip any nonsession hook. */ 637 if (NG_HOOK_PRIVATE(hook) == NULL) 638 continue; 639 if (cookie.pointer == NG_HOOK_PRIVATE(hook)) 640 break; 641 } 642 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer); 643 644 return (hook); 645 } 646 647 /************************************************************************** 648 * Start of Netgraph entrypoints. * 649 **************************************************************************/ 650 651 /* 652 * Allocate the private data structure and link it with node. 653 */ 654 static int 655 ng_pppoe_constructor(node_p node) 656 { 657 priv_p privp; 658 int i; 659 660 /* Initialize private descriptor. */ 661 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO); 662 663 /* Link structs together; this counts as our one reference to *node. */ 664 NG_NODE_SET_PRIVATE(node, privp); 665 privp->node = node; 666 667 /* Initialize to standard mode. */ 668 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); 669 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 670 671 LIST_INIT(&privp->listeners); 672 for (i = 0; i < SESSHASHSIZE; i++) { 673 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); 674 LIST_INIT(&privp->sesshash[i].head); 675 } 676 677 CTR3(KTR_NET, "%20s: created node [%x] (%p)", 678 __func__, node->nd_ID, node); 679 680 return (0); 681 } 682 683 /* 684 * Give our ok for a hook to be added... 685 * point the hook's private info to the hook structure. 686 * 687 * The following hook names are special: 688 * "ethernet": the hook that should be connected to a NIC. 689 * "debug": copies of data sent out here (when I write the code). 690 * All other hook names need only be unique. (the framework checks this). 691 */ 692 static int 693 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 694 { 695 const priv_p privp = NG_NODE_PRIVATE(node); 696 sessp sp; 697 698 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 699 privp->ethernet_hook = hook; 700 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); 701 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 702 privp->debug_hook = hook; 703 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); 704 } else { 705 /* 706 * Any other unique name is OK. 707 * The infrastructure has already checked that it's unique, 708 * so just allocate it and hook it in. 709 */ 710 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 711 if (sp == NULL) 712 return (ENOMEM); 713 714 NG_HOOK_SET_PRIVATE(hook, sp); 715 sp->hook = hook; 716 } 717 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", 718 __func__, node->nd_ID, node, name, hook); 719 720 return(0); 721 } 722 723 /* 724 * Hook has been added successfully. Request the MAC address of 725 * the underlying Ethernet node. 726 */ 727 static int 728 ng_pppoe_connect(hook_p hook) 729 { 730 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 731 struct ng_mesg *msg; 732 int error; 733 734 if (hook != privp->ethernet_hook) 735 return (0); 736 737 /* 738 * If this is Ethernet hook, then request MAC address 739 * from our downstream. 740 */ 741 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); 742 if (msg == NULL) 743 return (ENOBUFS); 744 745 /* 746 * Our hook and peer hook have HK_INVALID flag set, 747 * so we can't use NG_SEND_MSG_HOOK() macro here. 748 */ 749 NG_SEND_MSG_ID(error, privp->node, msg, 750 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), 751 NG_NODE_ID(privp->node)); 752 753 return (error); 754 } 755 /* 756 * Get a netgraph control message. 757 * Check it is one we understand. If needed, send a response. 758 * We sometimes save the address for an async action later. 759 * Always free the message. 760 */ 761 static int 762 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 763 { 764 priv_p privp = NG_NODE_PRIVATE(node); 765 struct ngpppoe_init_data *ourmsg = NULL; 766 struct ng_mesg *resp = NULL; 767 int error = 0; 768 hook_p hook = NULL; 769 sessp sp = NULL; 770 negp neg = NULL; 771 struct ng_mesg *msg; 772 773 NGI_GET_MSG(item, msg); 774 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", 775 __func__, node->nd_ID, node, msg->header.cmd, 776 msg->header.typecookie); 777 778 /* Deal with message according to cookie and command. */ 779 switch (msg->header.typecookie) { 780 case NGM_PPPOE_COOKIE: 781 switch (msg->header.cmd) { 782 case NGM_PPPOE_CONNECT: 783 case NGM_PPPOE_LISTEN: 784 case NGM_PPPOE_OFFER: 785 case NGM_PPPOE_SERVICE: 786 case NGM_PPPOE_SEND_HURL: 787 case NGM_PPPOE_SEND_MOTM: 788 ourmsg = (struct ngpppoe_init_data *)msg->data; 789 if (msg->header.arglen < sizeof(*ourmsg)) { 790 log(LOG_ERR, "ng_pppoe[%x]: init data too " 791 "small\n", node->nd_ID); 792 LEAVE(EMSGSIZE); 793 } 794 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 795 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 796 if (msg->header.arglen - sizeof(*ourmsg) > 797 PPPOE_PADM_VALUE_SIZE) { 798 log(LOG_ERR, "ng_pppoe[%x]: message " 799 "too big\n", node->nd_ID); 800 LEAVE(EMSGSIZE); 801 } 802 } else { 803 if (msg->header.arglen - sizeof(*ourmsg) > 804 PPPOE_SERVICE_NAME_SIZE) { 805 log(LOG_ERR, "ng_pppoe[%x]: service name " 806 "too big\n", node->nd_ID); 807 LEAVE(EMSGSIZE); 808 } 809 } 810 if (msg->header.arglen - sizeof(*ourmsg) < 811 ourmsg->data_len) { 812 log(LOG_ERR, "ng_pppoe[%x]: init data has bad " 813 "length, %d should be %zd\n", node->nd_ID, 814 ourmsg->data_len, 815 msg->header.arglen - sizeof (*ourmsg)); 816 LEAVE(EMSGSIZE); 817 } 818 819 /* Make sure strcmp will terminate safely. */ 820 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 821 822 /* Find hook by name. */ 823 hook = ng_findhook(node, ourmsg->hook); 824 if (hook == NULL) 825 LEAVE(ENOENT); 826 827 sp = NG_HOOK_PRIVATE(hook); 828 if (sp == NULL) 829 LEAVE(EINVAL); 830 831 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 832 /* 833 * Ensure we aren't already listening for this 834 * service. 835 */ 836 if (pppoe_find_svc(node, ourmsg->data, 837 ourmsg->data_len) != NULL) 838 LEAVE(EEXIST); 839 } 840 841 /* 842 * PPPOE_SERVICE advertisements are set up 843 * on sessions that are in PRIMED state. 844 */ 845 if (msg->header.cmd == NGM_PPPOE_SERVICE) 846 break; 847 848 /* 849 * PADM messages are set up on active sessions. 850 */ 851 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 852 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 853 if (sp->state != PPPOE_NEWCONNECTED && 854 sp->state != PPPOE_CONNECTED) { 855 log(LOG_NOTICE, "ng_pppoe[%x]: session is not " 856 "active\n", node->nd_ID); 857 LEAVE(EISCONN); 858 } 859 break; 860 } 861 862 if (sp->state != PPPOE_SNONE) { 863 log(LOG_NOTICE, "ng_pppoe[%x]: Session already " 864 "active\n", node->nd_ID); 865 LEAVE(EISCONN); 866 } 867 868 /* 869 * Set up prototype header. 870 */ 871 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, 872 M_NOWAIT | M_ZERO); 873 874 if (neg == NULL) 875 LEAVE(ENOMEM); 876 877 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 878 if (neg->m == NULL) { 879 free(neg, M_NETGRAPH_PPPOE); 880 LEAVE(ENOBUFS); 881 } 882 neg->m->m_pkthdr.rcvif = NULL; 883 sp->neg = neg; 884 ng_callout_init(&neg->handle); 885 neg->m->m_len = sizeof(struct pppoe_full_hdr); 886 neg->pkt = mtod(neg->m, union packet*); 887 memcpy((void *)&neg->pkt->pkt_header.eh, 888 &privp->eh, sizeof(struct ether_header)); 889 neg->pkt->pkt_header.ph.ver = 0x1; 890 neg->pkt->pkt_header.ph.type = 0x1; 891 neg->pkt->pkt_header.ph.sid = 0x0000; 892 neg->timeout = 0; 893 894 sp->creator = NGI_RETADDR(item); 895 } 896 switch (msg->header.cmd) { 897 case NGM_PPPOE_GET_STATUS: 898 { 899 struct ngpppoestat *stats; 900 901 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 902 if (!resp) 903 LEAVE(ENOMEM); 904 905 stats = (struct ngpppoestat *) resp->data; 906 stats->packets_in = privp->packets_in; 907 stats->packets_out = privp->packets_out; 908 break; 909 } 910 case NGM_PPPOE_CONNECT: 911 { 912 /* 913 * Check the hook exists and is Uninitialised. 914 * Send a PADI request, and start the timeout logic. 915 * Store the originator of this message so we can send 916 * a success or fail message to them later. 917 * Move the session to SINIT. 918 * Set up the session to the correct state and 919 * start it. 920 */ 921 int acnpos, acnlen = 0, acnsep = 0; 922 int hupos, hulen = 0, husep = 0; 923 int i, srvpos, srvlen; 924 acnpos = 0; 925 for (i = 0; i < ourmsg->data_len; i++) { 926 if (ourmsg->data[i] == '\\') { 927 acnlen = i; 928 acnsep = 1; 929 break; 930 } 931 } 932 hupos = acnlen + acnsep; 933 for (i = hupos; i < ourmsg->data_len; i++) { 934 if (ourmsg->data[i] == '|') { 935 hulen = i - hupos; 936 husep = 1; 937 break; 938 } 939 } 940 srvpos = hupos + hulen + husep; 941 srvlen = ourmsg->data_len - srvpos; 942 943 bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen); 944 neg->ac_name_len = acnlen; 945 946 neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ; 947 if (hulen == 0) { 948 /* Not provided, generate one */ 949 neg->host_uniq.hdr.tag_len = htons(sizeof(sp)); 950 bcopy(&sp, neg->host_uniq.data, sizeof(sp)); 951 neg->host_uniq_len = sizeof(sp); 952 } else if (hulen > 2 && ourmsg->data[hupos] == '0' && 953 ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) { 954 /* Hex encoded */ 955 static const char hexdig[16] = "0123456789abcdef"; 956 int j; 957 958 neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1)); 959 for (i = 0; i < hulen - 2; i++) { 960 for (j = 0; 961 j < 16 && 962 ourmsg->data[hupos + 2 + i] != hexdig[j]; 963 j++); 964 if (j == 16) 965 LEAVE(EINVAL); 966 if (i % 2 == 0) 967 neg->host_uniq.data[i / 2] = j << 4; 968 else 969 neg->host_uniq.data[i / 2] |= j; 970 } 971 neg->host_uniq_len = hulen / 2 - 1; 972 } else { 973 /* Plain string */ 974 neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen); 975 bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen); 976 neg->host_uniq_len = hulen; 977 } 978 979 neg->service.hdr.tag_type = PTT_SRV_NAME; 980 neg->service.hdr.tag_len = htons((uint16_t)srvlen); 981 bcopy(ourmsg->data + srvpos, neg->service.data, srvlen); 982 neg->service_len = srvlen; 983 pppoe_start(sp); 984 break; 985 } 986 case NGM_PPPOE_LISTEN: 987 /* 988 * Check the hook exists and is Uninitialised. 989 * Install the service matching string. 990 * Store the originator of this message so we can send 991 * a success or fail message to them later. 992 * Move the hook to 'LISTENING' 993 */ 994 neg->service.hdr.tag_type = PTT_SRV_NAME; 995 neg->service.hdr.tag_len = 996 htons((uint16_t)ourmsg->data_len); 997 998 if (ourmsg->data_len) 999 bcopy(ourmsg->data, neg->service.data, 1000 ourmsg->data_len); 1001 neg->service_len = ourmsg->data_len; 1002 neg->pkt->pkt_header.ph.code = PADT_CODE; 1003 /* 1004 * Wait for PADI packet coming from Ethernet. 1005 */ 1006 sp->state = PPPOE_LISTENING; 1007 LIST_INSERT_HEAD(&privp->listeners, sp, sessions); 1008 break; 1009 case NGM_PPPOE_OFFER: 1010 /* 1011 * Check the hook exists and is Uninitialised. 1012 * Store the originator of this message so we can send 1013 * a success of fail message to them later. 1014 * Store the AC-Name given and go to PRIMED. 1015 */ 1016 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 1017 neg->ac_name.hdr.tag_len = 1018 htons((uint16_t)ourmsg->data_len); 1019 if (ourmsg->data_len) 1020 bcopy(ourmsg->data, neg->ac_name.data, 1021 ourmsg->data_len); 1022 neg->ac_name_len = ourmsg->data_len; 1023 neg->pkt->pkt_header.ph.code = PADO_CODE; 1024 /* 1025 * Wait for PADI packet coming from hook. 1026 */ 1027 sp->state = PPPOE_PRIMED; 1028 break; 1029 case NGM_PPPOE_SERVICE: 1030 /* 1031 * Check the session is primed. 1032 * for now just allow ONE service to be advertised. 1033 * If you do it twice you just overwrite. 1034 */ 1035 if (sp->state != PPPOE_PRIMED) { 1036 log(LOG_NOTICE, "ng_pppoe[%x]: session not " 1037 "primed\n", node->nd_ID); 1038 LEAVE(EISCONN); 1039 } 1040 neg = sp->neg; 1041 neg->service.hdr.tag_type = PTT_SRV_NAME; 1042 neg->service.hdr.tag_len = 1043 htons((uint16_t)ourmsg->data_len); 1044 1045 if (ourmsg->data_len) 1046 bcopy(ourmsg->data, neg->service.data, 1047 ourmsg->data_len); 1048 neg->service_len = ourmsg->data_len; 1049 break; 1050 case NGM_PPPOE_SETMODE: 1051 { 1052 char *s; 1053 size_t len; 1054 1055 if (msg->header.arglen == 0) 1056 LEAVE(EINVAL); 1057 1058 s = (char *)msg->data; 1059 len = msg->header.arglen - 1; 1060 1061 /* Search for matching mode string. */ 1062 if (len == strlen(NG_PPPOE_STANDARD) && 1063 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { 1064 privp->flags = 0; 1065 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1066 break; 1067 } 1068 if (len == strlen(NG_PPPOE_3COM) && 1069 (strncmp(NG_PPPOE_3COM, s, len) == 0)) { 1070 privp->flags |= COMPAT_3COM; 1071 privp->eh.ether_type = 1072 ETHERTYPE_PPPOE_3COM_DISC; 1073 break; 1074 } 1075 if (len == strlen(NG_PPPOE_DLINK) && 1076 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { 1077 privp->flags |= COMPAT_DLINK; 1078 break; 1079 } 1080 error = EINVAL; 1081 break; 1082 } 1083 case NGM_PPPOE_GETMODE: 1084 { 1085 char *s; 1086 size_t len = 0; 1087 1088 if (privp->flags == 0) 1089 len += strlen(NG_PPPOE_STANDARD) + 1; 1090 if (privp->flags & COMPAT_3COM) 1091 len += strlen(NG_PPPOE_3COM) + 1; 1092 if (privp->flags & COMPAT_DLINK) 1093 len += strlen(NG_PPPOE_DLINK) + 1; 1094 1095 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 1096 if (resp == NULL) 1097 LEAVE(ENOMEM); 1098 1099 s = (char *)resp->data; 1100 if (privp->flags == 0) { 1101 len = strlen(NG_PPPOE_STANDARD); 1102 strlcpy(s, NG_PPPOE_STANDARD, len + 1); 1103 break; 1104 } 1105 if (privp->flags & COMPAT_3COM) { 1106 len = strlen(NG_PPPOE_3COM); 1107 strlcpy(s, NG_PPPOE_3COM, len + 1); 1108 s += len; 1109 } 1110 if (privp->flags & COMPAT_DLINK) { 1111 if (s != resp->data) 1112 *s++ = '|'; 1113 len = strlen(NG_PPPOE_DLINK); 1114 strlcpy(s, NG_PPPOE_DLINK, len + 1); 1115 } 1116 break; 1117 } 1118 case NGM_PPPOE_SETENADDR: 1119 if (msg->header.arglen != ETHER_ADDR_LEN) 1120 LEAVE(EINVAL); 1121 bcopy(msg->data, &privp->eh.ether_shost, 1122 ETHER_ADDR_LEN); 1123 break; 1124 case NGM_PPPOE_SETMAXP: 1125 if (msg->header.arglen != sizeof(uint16_t)) 1126 LEAVE(EINVAL); 1127 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL; 1128 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t)); 1129 privp->max_payload.data = htons(*((uint16_t *)msg->data)); 1130 break; 1131 case NGM_PPPOE_SEND_HURL: 1132 { 1133 struct mbuf *m; 1134 1135 /* Generate a packet of that type. */ 1136 m = m_gethdr(M_NOWAIT, MT_DATA); 1137 if (m == NULL) 1138 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1139 "mbufs\n", node->nd_ID); 1140 else { 1141 struct pppoe_full_hdr *wh; 1142 struct pppoe_tag *tag; 1143 int error = 0; 1144 1145 wh = mtod(m, struct pppoe_full_hdr *); 1146 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1147 1148 /* Revert the stored header to DISC/PADM mode. */ 1149 wh->ph.code = PADM_CODE; 1150 /* 1151 * Configure ethertype depending on what 1152 * was used during sessions stage. 1153 */ 1154 if (wh->eh.ether_type == 1155 ETHERTYPE_PPPOE_3COM_SESS) 1156 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1157 else 1158 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1159 /* 1160 * Add PADM message and adjust sizes. 1161 */ 1162 tag = (void *)(&wh->ph + 1); 1163 tag->tag_type = PTT_HURL; 1164 tag->tag_len = htons(ourmsg->data_len); 1165 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1166 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1167 ourmsg->data_len; 1168 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1169 NG_SEND_DATA_ONLY(error, 1170 privp->ethernet_hook, m); 1171 } 1172 break; 1173 } 1174 case NGM_PPPOE_SEND_MOTM: 1175 { 1176 struct mbuf *m; 1177 1178 /* Generate a packet of that type. */ 1179 m = m_gethdr(M_NOWAIT, MT_DATA); 1180 if (m == NULL) 1181 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1182 "mbufs\n", node->nd_ID); 1183 else { 1184 struct pppoe_full_hdr *wh; 1185 struct pppoe_tag *tag; 1186 int error = 0; 1187 1188 wh = mtod(m, struct pppoe_full_hdr *); 1189 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1190 1191 /* Revert the stored header to DISC/PADM mode. */ 1192 wh->ph.code = PADM_CODE; 1193 /* 1194 * Configure ethertype depending on what 1195 * was used during sessions stage. 1196 */ 1197 if (wh->eh.ether_type == 1198 ETHERTYPE_PPPOE_3COM_SESS) 1199 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1200 else 1201 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1202 /* 1203 * Add PADM message and adjust sizes. 1204 */ 1205 tag = (void *)(&wh->ph + 1); 1206 tag->tag_type = PTT_MOTM; 1207 tag->tag_len = htons(ourmsg->data_len); 1208 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1209 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1210 ourmsg->data_len; 1211 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1212 NG_SEND_DATA_ONLY(error, 1213 privp->ethernet_hook, m); 1214 } 1215 break; 1216 } 1217 default: 1218 LEAVE(EINVAL); 1219 } 1220 break; 1221 case NGM_ETHER_COOKIE: 1222 if (!(msg->header.flags & NGF_RESP)) 1223 LEAVE(EINVAL); 1224 switch (msg->header.cmd) { 1225 case NGM_ETHER_GET_ENADDR: 1226 if (msg->header.arglen != ETHER_ADDR_LEN) 1227 LEAVE(EINVAL); 1228 bcopy(msg->data, &privp->eh.ether_shost, 1229 ETHER_ADDR_LEN); 1230 break; 1231 default: 1232 LEAVE(EINVAL); 1233 } 1234 break; 1235 default: 1236 LEAVE(EINVAL); 1237 } 1238 1239 /* Take care of synchronous response, if any. */ 1240 quit: 1241 CTR2(KTR_NET, "%20s: returning %d", __func__, error); 1242 NG_RESPOND_MSG(error, node, item, resp); 1243 /* Free the message and return. */ 1244 NG_FREE_MSG(msg); 1245 return(error); 1246 } 1247 1248 /* 1249 * Start a client into the first state. A separate function because 1250 * it can be needed if the negotiation times out. 1251 */ 1252 static void 1253 pppoe_start(sessp sp) 1254 { 1255 hook_p hook = sp->hook; 1256 node_p node = NG_HOOK_NODE(hook); 1257 priv_p privp = NG_NODE_PRIVATE(node); 1258 negp neg = sp->neg; 1259 struct mbuf *m0; 1260 int error; 1261 1262 /* 1263 * Kick the state machine into starting up. 1264 */ 1265 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1266 sp->state = PPPOE_SINIT; 1267 /* 1268 * Reset the packet header to broadcast. Since we are 1269 * in a client mode use configured ethertype. 1270 */ 1271 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, 1272 sizeof(struct ether_header)); 1273 neg->pkt->pkt_header.ph.code = PADI_CODE; 1274 init_tags(sp); 1275 insert_tag(sp, &neg->host_uniq.hdr); 1276 insert_tag(sp, &neg->service.hdr); 1277 if (privp->max_payload.data != 0) 1278 insert_tag(sp, &privp->max_payload.hdr); 1279 make_packet(sp); 1280 /* 1281 * Send packet and prepare to retransmit it after timeout. 1282 */ 1283 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1284 pppoe_ticker, NULL, 0); 1285 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1286 m0 = m_copypacket(neg->m, M_NOWAIT); 1287 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); 1288 } 1289 1290 static int 1291 send_acname(sessp sp, const struct pppoe_tag *tag) 1292 { 1293 int error, tlen; 1294 struct ng_mesg *msg; 1295 struct ngpppoe_sts *sts; 1296 1297 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1298 1299 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 1300 sizeof(struct ngpppoe_sts), M_NOWAIT); 1301 if (msg == NULL) 1302 return (ENOMEM); 1303 1304 sts = (struct ngpppoe_sts *)msg->data; 1305 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1306 strncpy(sts->hook, (const char *)(tag + 1), tlen); 1307 sts->hook[tlen] = '\0'; 1308 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1309 1310 return (error); 1311 } 1312 1313 static int 1314 send_sessionid(sessp sp) 1315 { 1316 int error; 1317 struct ng_mesg *msg; 1318 1319 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1320 1321 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1322 sizeof(uint16_t), M_NOWAIT); 1323 if (msg == NULL) 1324 return (ENOMEM); 1325 1326 *(uint16_t *)msg->data = sp->Session_ID; 1327 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1328 1329 return (error); 1330 } 1331 1332 static int 1333 send_maxp(sessp sp, const struct pppoe_tag *tag) 1334 { 1335 int error; 1336 struct ng_mesg *msg; 1337 struct ngpppoe_maxp *maxp; 1338 1339 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1340 1341 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, 1342 sizeof(struct ngpppoe_maxp), M_NOWAIT); 1343 if (msg == NULL) 1344 return (ENOMEM); 1345 1346 maxp = (struct ngpppoe_maxp *)msg->data; 1347 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1348 maxp->data = ntohs(((const struct maxptag *)tag)->data); 1349 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1350 1351 return (error); 1352 } 1353 1354 static int 1355 send_hurl(sessp sp, const struct pppoe_tag *tag) 1356 { 1357 int error, tlen; 1358 struct ng_mesg *msg; 1359 struct ngpppoe_padm *padm; 1360 1361 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1362 1363 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL, 1364 sizeof(struct ngpppoe_padm), M_NOWAIT); 1365 if (msg == NULL) 1366 return (ENOMEM); 1367 1368 padm = (struct ngpppoe_padm *)msg->data; 1369 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1370 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1371 padm->msg[tlen] = '\0'; 1372 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1373 1374 return (error); 1375 } 1376 1377 static int 1378 send_motm(sessp sp, const struct pppoe_tag *tag) 1379 { 1380 int error, tlen; 1381 struct ng_mesg *msg; 1382 struct ngpppoe_padm *padm; 1383 1384 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1385 1386 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM, 1387 sizeof(struct ngpppoe_padm), M_NOWAIT); 1388 if (msg == NULL) 1389 return (ENOMEM); 1390 1391 padm = (struct ngpppoe_padm *)msg->data; 1392 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1393 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1394 padm->msg[tlen] = '\0'; 1395 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1396 1397 return (error); 1398 } 1399 1400 /* 1401 * Receive data from session hook and do something with it. 1402 */ 1403 static int 1404 ng_pppoe_rcvdata(hook_p hook, item_p item) 1405 { 1406 node_p node = NG_HOOK_NODE(hook); 1407 const priv_p privp = NG_NODE_PRIVATE(node); 1408 sessp sp = NG_HOOK_PRIVATE(hook); 1409 struct pppoe_full_hdr *wh; 1410 struct mbuf *m; 1411 int error; 1412 1413 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1414 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1415 1416 NGI_GET_M(item, m); 1417 switch (sp->state) { 1418 case PPPOE_NEWCONNECTED: 1419 case PPPOE_CONNECTED: { 1420 /* 1421 * Remove PPP address and control fields, if any. 1422 * For example, ng_ppp(4) always sends LCP packets 1423 * with address and control fields as required by 1424 * generic PPP. PPPoE is an exception to the rule. 1425 */ 1426 if (m->m_pkthdr.len >= 2) { 1427 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1428 LEAVE(ENOBUFS); 1429 if (mtod(m, u_char *)[0] == 0xff && 1430 mtod(m, u_char *)[1] == 0x03) 1431 m_adj(m, 2); 1432 } 1433 /* 1434 * Bang in a pre-made header, and set the length up 1435 * to be correct. Then send it to the ethernet driver. 1436 */ 1437 M_PREPEND(m, sizeof(*wh), M_NOWAIT); 1438 if (m == NULL) 1439 LEAVE(ENOBUFS); 1440 1441 wh = mtod(m, struct pppoe_full_hdr *); 1442 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1443 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh)); 1444 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m); 1445 privp->packets_out++; 1446 break; 1447 } 1448 case PPPOE_PRIMED: { 1449 struct { 1450 struct pppoe_tag hdr; 1451 union uniq data; 1452 } __packed uniqtag; 1453 const struct pppoe_tag *tag; 1454 struct mbuf *m0; 1455 const struct pppoe_hdr *ph; 1456 negp neg = sp->neg; 1457 uint16_t session; 1458 uint16_t length; 1459 uint8_t code; 1460 1461 /* 1462 * A PADI packet is being returned by the application 1463 * that has set up this hook. This indicates that it 1464 * wants us to offer service. 1465 */ 1466 if (m->m_len < sizeof(*wh)) { 1467 m = m_pullup(m, sizeof(*wh)); 1468 if (m == NULL) 1469 LEAVE(ENOBUFS); 1470 } 1471 wh = mtod(m, struct pppoe_full_hdr *); 1472 ph = &wh->ph; 1473 session = ntohs(wh->ph.sid); 1474 length = ntohs(wh->ph.length); 1475 code = wh->ph.code; 1476 /* Use peers mode in session. */ 1477 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1478 if (code != PADI_CODE) 1479 LEAVE(EINVAL); 1480 ng_uncallout(&neg->handle, node); 1481 1482 /* 1483 * This is the first time we hear 1484 * from the client, so note it's 1485 * unicast address, replacing the 1486 * broadcast address. 1487 */ 1488 bcopy(wh->eh.ether_shost, 1489 neg->pkt->pkt_header.eh.ether_dhost, 1490 ETHER_ADDR_LEN); 1491 sp->state = PPPOE_SOFFER; 1492 neg->timeout = 0; 1493 neg->pkt->pkt_header.ph.code = PADO_CODE; 1494 1495 /* 1496 * Start working out the tags to respond with. 1497 */ 1498 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1499 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1500 uniqtag.data.pointer = sp; 1501 init_tags(sp); 1502 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1503 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1504 insert_tag(sp, tag); /* return service */ 1505 /* 1506 * If we have a NULL service request 1507 * and have an extra service defined in this hook, 1508 * then also add a tag for the extra service. 1509 * XXX this is a hack. eventually we should be able 1510 * to support advertising many services, not just one 1511 */ 1512 if (((tag == NULL) || (tag->tag_len == 0)) && 1513 (neg->service.hdr.tag_len != 0)) { 1514 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1515 } 1516 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1517 insert_tag(sp, tag); /* returned hostunique */ 1518 insert_tag(sp, &uniqtag.hdr); 1519 scan_tags(sp, ph); 1520 make_packet(sp); 1521 /* 1522 * Send the offer but if they don't respond 1523 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1524 */ 1525 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1526 pppoe_ticker, NULL, 0); 1527 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1528 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1529 privp->packets_out++; 1530 break; 1531 } 1532 1533 /* 1534 * Packets coming from the hook make no sense 1535 * to sessions in the rest of states. Throw them away. 1536 */ 1537 default: 1538 LEAVE(ENETUNREACH); 1539 } 1540 quit: 1541 if (item) 1542 NG_FREE_ITEM(item); 1543 NG_FREE_M(m); 1544 return (error); 1545 } 1546 1547 /* 1548 * Receive data from ether and do something with it. 1549 */ 1550 static int 1551 ng_pppoe_rcvdata_ether(hook_p hook, item_p item) 1552 { 1553 node_p node = NG_HOOK_NODE(hook); 1554 const priv_p privp = NG_NODE_PRIVATE(node); 1555 sessp sp; 1556 const struct pppoe_tag *utag = NULL, *tag = NULL; 1557 const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 }; 1558 const struct pppoe_full_hdr *wh; 1559 const struct pppoe_hdr *ph; 1560 negp neg = NULL; 1561 struct mbuf *m; 1562 hook_p sendhook; 1563 int error = 0; 1564 uint16_t session; 1565 uint16_t length; 1566 uint8_t code; 1567 struct mbuf *m0; 1568 1569 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1570 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1571 1572 NGI_GET_M(item, m); 1573 /* 1574 * Dig out various fields from the packet. 1575 * Use them to decide where to send it. 1576 */ 1577 privp->packets_in++; 1578 if( m->m_len < sizeof(*wh)) { 1579 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1580 if (m == NULL) { 1581 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " 1582 "m_pullup(wh)\n", node->nd_ID); 1583 LEAVE(ENOBUFS); 1584 } 1585 } 1586 wh = mtod(m, struct pppoe_full_hdr *); 1587 length = ntohs(wh->ph.length); 1588 switch(wh->eh.ether_type) { 1589 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ 1590 case ETHERTYPE_PPPOE_DISC: 1591 /* 1592 * We need to try to make sure that the tag area 1593 * is contiguous, or we could wander off the end 1594 * of a buffer and make a mess. 1595 * (Linux wouldn't have this problem). 1596 */ 1597 if (m->m_pkthdr.len <= MHLEN) { 1598 if( m->m_len < m->m_pkthdr.len) { 1599 m = m_pullup(m, m->m_pkthdr.len); 1600 if (m == NULL) { 1601 log(LOG_NOTICE, "ng_pppoe[%x]: " 1602 "couldn't m_pullup(pkthdr)\n", 1603 node->nd_ID); 1604 LEAVE(ENOBUFS); 1605 } 1606 } 1607 } 1608 if (m->m_len != m->m_pkthdr.len) { 1609 /* 1610 * It's not all in one piece. 1611 * We need to do extra work. 1612 * Put it into a cluster. 1613 */ 1614 struct mbuf *n; 1615 n = m_dup(m, M_NOWAIT); 1616 m_freem(m); 1617 m = n; 1618 if (m) { 1619 /* just check we got a cluster */ 1620 if (m->m_len != m->m_pkthdr.len) { 1621 m_freem(m); 1622 m = NULL; 1623 } 1624 } 1625 if (m == NULL) { 1626 log(LOG_NOTICE, "ng_pppoe[%x]: packet " 1627 "fragmented\n", node->nd_ID); 1628 LEAVE(EMSGSIZE); 1629 } 1630 } 1631 wh = mtod(m, struct pppoe_full_hdr *); 1632 length = ntohs(wh->ph.length); 1633 ph = &wh->ph; 1634 session = ntohs(wh->ph.sid); 1635 code = wh->ph.code; 1636 1637 switch(code) { 1638 case PADI_CODE: 1639 /* 1640 * We are a server: 1641 * Look for a hook with the required service and send 1642 * the ENTIRE packet up there. It should come back to 1643 * a new hook in PRIMED state. Look there for further 1644 * processing. 1645 */ 1646 tag = get_tag(ph, PTT_SRV_NAME); 1647 if (tag == NULL) 1648 tag = &sntag; 1649 1650 /* 1651 * First, try to match Service-Name against our 1652 * listening hooks. If no success and we are in D-Link 1653 * compat mode and Service-Name is empty, then we 1654 * broadcast the PADI to all listening hooks. 1655 */ 1656 sendhook = pppoe_match_svc(node, tag); 1657 if (sendhook != NULL) 1658 NG_FWD_NEW_DATA(error, item, sendhook, m); 1659 else if (privp->flags & COMPAT_DLINK && 1660 ntohs(tag->tag_len) == 0) 1661 error = pppoe_broadcast_padi(node, m); 1662 else 1663 error = ENETUNREACH; 1664 break; 1665 case PADO_CODE: 1666 /* 1667 * We are a client: 1668 * Use the host_uniq tag to find the hook this is in 1669 * response to. Received #2, now send #3 1670 * For now simply accept the first we receive. 1671 */ 1672 utag = get_tag(ph, PTT_HOST_UNIQ); 1673 if (utag == NULL) { 1674 log(LOG_NOTICE, "ng_pppoe[%x]: no host " 1675 "unique field\n", node->nd_ID); 1676 LEAVE(ENETUNREACH); 1677 } 1678 1679 sendhook = pppoe_finduniq(node, utag); 1680 if (sendhook == NULL) { 1681 log(LOG_NOTICE, "ng_pppoe[%x]: no " 1682 "matching session\n", node->nd_ID); 1683 LEAVE(ENETUNREACH); 1684 } 1685 1686 /* 1687 * Check the session is in the right state. 1688 * It needs to be in PPPOE_SINIT. 1689 */ 1690 sp = NG_HOOK_PRIVATE(sendhook); 1691 if (sp->state == PPPOE_SREQ || 1692 sp->state == PPPOE_CONNECTED) { 1693 break; /* Multiple PADO is OK. */ 1694 } 1695 if (sp->state != PPPOE_SINIT) { 1696 log(LOG_NOTICE, "ng_pppoe[%x]: session " 1697 "in wrong state\n", node->nd_ID); 1698 LEAVE(ENETUNREACH); 1699 } 1700 neg = sp->neg; 1701 /* If requested specific AC-name, check it. */ 1702 if (neg->ac_name_len) { 1703 tag = get_tag(ph, PTT_AC_NAME); 1704 if (!tag) { 1705 /* No PTT_AC_NAME in PADO */ 1706 break; 1707 } 1708 if (neg->ac_name_len != htons(tag->tag_len) || 1709 strncmp(neg->ac_name.data, 1710 (const char *)(tag + 1), 1711 neg->ac_name_len) != 0) { 1712 break; 1713 } 1714 } 1715 sp->state = PPPOE_SREQ; 1716 ng_uncallout(&neg->handle, node); 1717 1718 /* 1719 * This is the first time we hear 1720 * from the server, so note it's 1721 * unicast address, replacing the 1722 * broadcast address . 1723 */ 1724 bcopy(wh->eh.ether_shost, 1725 neg->pkt->pkt_header.eh.ether_dhost, 1726 ETHER_ADDR_LEN); 1727 neg->timeout = 0; 1728 neg->pkt->pkt_header.ph.code = PADR_CODE; 1729 init_tags(sp); 1730 insert_tag(sp, utag); /* Host Unique */ 1731 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1732 insert_tag(sp, tag); /* return cookie */ 1733 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1734 insert_tag(sp, tag); /* return it */ 1735 send_acname(sp, tag); 1736 } 1737 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1738 (privp->max_payload.data != 0)) 1739 insert_tag(sp, tag); /* return it */ 1740 insert_tag(sp, &neg->service.hdr); /* Service */ 1741 scan_tags(sp, ph); 1742 make_packet(sp); 1743 sp->state = PPPOE_SREQ; 1744 ng_callout(&neg->handle, node, sp->hook, 1745 PPPOE_INITIAL_TIMEOUT * hz, 1746 pppoe_ticker, NULL, 0); 1747 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1748 m0 = m_copypacket(neg->m, M_NOWAIT); 1749 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1750 break; 1751 case PADR_CODE: 1752 /* 1753 * We are a server: 1754 * Use the ac_cookie tag to find the 1755 * hook this is in response to. 1756 */ 1757 utag = get_tag(ph, PTT_AC_COOKIE); 1758 if ((utag == NULL) || 1759 (ntohs(utag->tag_len) != sizeof(sp))) { 1760 LEAVE(ENETUNREACH); 1761 } 1762 1763 sendhook = pppoe_findcookie(node, utag); 1764 if (sendhook == NULL) 1765 LEAVE(ENETUNREACH); 1766 1767 /* 1768 * Check the session is in the right state. 1769 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. 1770 * If the latter, then this is a retry by the client, 1771 * so be nice, and resend. 1772 */ 1773 sp = NG_HOOK_PRIVATE(sendhook); 1774 if (sp->state == PPPOE_NEWCONNECTED) { 1775 /* 1776 * Whoa! drop back to resend that PADS packet. 1777 * We should still have a copy of it. 1778 */ 1779 sp->state = PPPOE_SOFFER; 1780 } else if (sp->state != PPPOE_SOFFER) 1781 LEAVE (ENETUNREACH); 1782 neg = sp->neg; 1783 ng_uncallout(&neg->handle, node); 1784 neg->pkt->pkt_header.ph.code = PADS_CODE; 1785 if (sp->Session_ID == 0) { 1786 neg->pkt->pkt_header.ph.sid = 1787 htons(pppoe_getnewsession(sp)); 1788 } 1789 send_sessionid(sp); 1790 neg->timeout = 0; 1791 /* 1792 * start working out the tags to respond with. 1793 */ 1794 init_tags(sp); 1795 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1796 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1797 insert_tag(sp, tag);/* return service */ 1798 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1799 insert_tag(sp, tag); /* return it */ 1800 insert_tag(sp, utag); /* ac_cookie */ 1801 scan_tags(sp, ph); 1802 make_packet(sp); 1803 sp->state = PPPOE_NEWCONNECTED; 1804 1805 /* Send the PADS without a timeout - we're now connected. */ 1806 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1807 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1808 1809 /* 1810 * Having sent the last Negotiation header, 1811 * Set up the stored packet header to be correct for 1812 * the actual session. But keep the negotialtion stuff 1813 * around in case we need to resend this last packet. 1814 * We'll discard it when we move from NEWCONNECTED 1815 * to CONNECTED 1816 */ 1817 sp->pkt_hdr = neg->pkt->pkt_header; 1818 /* Configure ethertype depending on what 1819 * ethertype was used at discovery phase */ 1820 if (sp->pkt_hdr.eh.ether_type == 1821 ETHERTYPE_PPPOE_3COM_DISC) 1822 sp->pkt_hdr.eh.ether_type 1823 = ETHERTYPE_PPPOE_3COM_SESS; 1824 else 1825 sp->pkt_hdr.eh.ether_type 1826 = ETHERTYPE_PPPOE_SESS; 1827 sp->pkt_hdr.ph.code = 0; 1828 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1829 break; 1830 case PADS_CODE: 1831 /* 1832 * We are a client: 1833 * Use the host_uniq tag to find the hook this is in 1834 * response to. Take the session ID and store it away. 1835 * Also make sure the pre-made header is correct and 1836 * set us into Session mode. 1837 */ 1838 utag = get_tag(ph, PTT_HOST_UNIQ); 1839 if (utag == NULL) { 1840 LEAVE (ENETUNREACH); 1841 } 1842 sendhook = pppoe_finduniq(node, utag); 1843 if (sendhook == NULL) 1844 LEAVE(ENETUNREACH); 1845 1846 /* 1847 * Check the session is in the right state. 1848 * It needs to be in PPPOE_SREQ. 1849 */ 1850 sp = NG_HOOK_PRIVATE(sendhook); 1851 if (sp->state != PPPOE_SREQ) 1852 LEAVE(ENETUNREACH); 1853 neg = sp->neg; 1854 ng_uncallout(&neg->handle, node); 1855 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1856 sp->Session_ID = ntohs(wh->ph.sid); 1857 pppoe_addsession(sp); 1858 send_sessionid(sp); 1859 neg->timeout = 0; 1860 sp->state = PPPOE_CONNECTED; 1861 /* 1862 * Now we have gone to Connected mode, 1863 * Free all resources needed for negotiation. 1864 * Keep a copy of the header we will be using. 1865 */ 1866 sp->pkt_hdr = neg->pkt->pkt_header; 1867 if (privp->flags & COMPAT_3COM) 1868 sp->pkt_hdr.eh.ether_type 1869 = ETHERTYPE_PPPOE_3COM_SESS; 1870 else 1871 sp->pkt_hdr.eh.ether_type 1872 = ETHERTYPE_PPPOE_SESS; 1873 sp->pkt_hdr.ph.code = 0; 1874 m_freem(neg->m); 1875 free(sp->neg, M_NETGRAPH_PPPOE); 1876 sp->neg = NULL; 1877 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1878 (privp->max_payload.data != 0)) 1879 send_maxp(sp, tag); 1880 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1881 break; 1882 case PADT_CODE: 1883 /* 1884 * Find matching peer/session combination. 1885 */ 1886 sp = pppoe_findsession(privp, wh); 1887 if (sp == NULL) 1888 LEAVE(ENETUNREACH); 1889 /* Disconnect that hook. */ 1890 ng_rmhook_self(sp->hook); 1891 break; 1892 case PADM_CODE: 1893 /* 1894 * We are a client: 1895 * find matching peer/session combination. 1896 */ 1897 sp = pppoe_findsession(privp, wh); 1898 if (sp == NULL) 1899 LEAVE (ENETUNREACH); 1900 if ((tag = get_tag(ph, PTT_HURL))) 1901 send_hurl(sp, tag); 1902 if ((tag = get_tag(ph, PTT_MOTM))) 1903 send_motm(sp, tag); 1904 break; 1905 default: 1906 LEAVE(EPFNOSUPPORT); 1907 } 1908 break; 1909 case ETHERTYPE_PPPOE_3COM_SESS: 1910 case ETHERTYPE_PPPOE_SESS: 1911 /* 1912 * Find matching peer/session combination. 1913 */ 1914 sp = pppoe_findsession(privp, wh); 1915 if (sp == NULL) 1916 LEAVE (ENETUNREACH); 1917 m_adj(m, sizeof(*wh)); 1918 1919 /* If packet too short, dump it. */ 1920 if (m->m_pkthdr.len < length) 1921 LEAVE(EMSGSIZE); 1922 /* Also need to trim excess at the end */ 1923 if (m->m_pkthdr.len > length) { 1924 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1925 } 1926 if ( sp->state != PPPOE_CONNECTED) { 1927 if (sp->state == PPPOE_NEWCONNECTED) { 1928 sp->state = PPPOE_CONNECTED; 1929 /* 1930 * Now we have gone to Connected mode, 1931 * Free all resources needed for negotiation. 1932 * Be paranoid about whether there may be 1933 * a timeout. 1934 */ 1935 m_freem(sp->neg->m); 1936 ng_uncallout(&sp->neg->handle, node); 1937 free(sp->neg, M_NETGRAPH_PPPOE); 1938 sp->neg = NULL; 1939 } else { 1940 LEAVE (ENETUNREACH); 1941 } 1942 } 1943 NG_FWD_NEW_DATA(error, item, sp->hook, m); 1944 break; 1945 default: 1946 LEAVE(EPFNOSUPPORT); 1947 } 1948 quit: 1949 if (item) 1950 NG_FREE_ITEM(item); 1951 NG_FREE_M(m); 1952 return (error); 1953 } 1954 1955 /* 1956 * Receive data from debug hook and bypass it to ether. 1957 */ 1958 static int 1959 ng_pppoe_rcvdata_debug(hook_p hook, item_p item) 1960 { 1961 node_p node = NG_HOOK_NODE(hook); 1962 const priv_p privp = NG_NODE_PRIVATE(node); 1963 int error; 1964 1965 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1966 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1967 1968 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); 1969 privp->packets_out++; 1970 return (error); 1971 } 1972 1973 /* 1974 * Do local shutdown processing.. 1975 * If we are a persistent device, we might refuse to go away, and 1976 * we'd only remove our links and reset ourself. 1977 */ 1978 static int 1979 ng_pppoe_shutdown(node_p node) 1980 { 1981 const priv_p privp = NG_NODE_PRIVATE(node); 1982 int i; 1983 1984 for (i = 0; i < SESSHASHSIZE; i++) 1985 mtx_destroy(&privp->sesshash[i].mtx); 1986 NG_NODE_SET_PRIVATE(node, NULL); 1987 NG_NODE_UNREF(privp->node); 1988 free(privp, M_NETGRAPH_PPPOE); 1989 return (0); 1990 } 1991 1992 /* 1993 * Hook disconnection 1994 * 1995 * Clean up all dangling links and information about the session/hook. 1996 * For this type, removal of the last link destroys the node. 1997 */ 1998 static int 1999 ng_pppoe_disconnect(hook_p hook) 2000 { 2001 node_p node = NG_HOOK_NODE(hook); 2002 priv_p privp = NG_NODE_PRIVATE(node); 2003 sessp sp; 2004 2005 if (hook == privp->debug_hook) { 2006 privp->debug_hook = NULL; 2007 } else if (hook == privp->ethernet_hook) { 2008 privp->ethernet_hook = NULL; 2009 if (NG_NODE_IS_VALID(node)) 2010 ng_rmnode_self(node); 2011 } else { 2012 sp = NG_HOOK_PRIVATE(hook); 2013 if (sp->state != PPPOE_SNONE ) { 2014 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 2015 } 2016 /* 2017 * According to the spec, if we are connected, 2018 * we should send a DISC packet if we are shutting down 2019 * a session. 2020 */ 2021 if ((privp->ethernet_hook) 2022 && ((sp->state == PPPOE_CONNECTED) 2023 || (sp->state == PPPOE_NEWCONNECTED))) { 2024 struct mbuf *m; 2025 2026 /* Generate a packet of that type. */ 2027 m = m_gethdr(M_NOWAIT, MT_DATA); 2028 if (m == NULL) 2029 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 2030 "mbufs\n", node->nd_ID); 2031 else { 2032 struct pppoe_full_hdr *wh; 2033 struct pppoe_tag *tag; 2034 int msglen = strlen(SIGNOFF); 2035 int error = 0; 2036 2037 wh = mtod(m, struct pppoe_full_hdr *); 2038 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 2039 2040 /* Revert the stored header to DISC/PADT mode. */ 2041 wh->ph.code = PADT_CODE; 2042 /* 2043 * Configure ethertype depending on what 2044 * was used during sessions stage. 2045 */ 2046 if (wh->eh.ether_type == 2047 ETHERTYPE_PPPOE_3COM_SESS) 2048 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 2049 else 2050 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 2051 /* 2052 * Add a General error message and adjust 2053 * sizes. 2054 */ 2055 tag = (void *)(&wh->ph + 1); 2056 tag->tag_type = PTT_GEN_ERR; 2057 tag->tag_len = htons((u_int16_t)msglen); 2058 strncpy((char *)(tag + 1), SIGNOFF, msglen); 2059 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 2060 msglen; 2061 wh->ph.length = htons(sizeof(*tag) + msglen); 2062 NG_SEND_DATA_ONLY(error, 2063 privp->ethernet_hook, m); 2064 } 2065 } 2066 if (sp->state == PPPOE_LISTENING) 2067 LIST_REMOVE(sp, sessions); 2068 else if (sp->Session_ID) 2069 pppoe_delsession(sp); 2070 /* 2071 * As long as we have somewhere to store the timeout handle, 2072 * we may have a timeout pending.. get rid of it. 2073 */ 2074 if (sp->neg) { 2075 ng_uncallout(&sp->neg->handle, node); 2076 if (sp->neg->m) 2077 m_freem(sp->neg->m); 2078 free(sp->neg, M_NETGRAPH_PPPOE); 2079 } 2080 free(sp, M_NETGRAPH_PPPOE); 2081 NG_HOOK_SET_PRIVATE(hook, NULL); 2082 } 2083 if ((NG_NODE_NUMHOOKS(node) == 0) && 2084 (NG_NODE_IS_VALID(node))) 2085 ng_rmnode_self(node); 2086 return (0); 2087 } 2088 2089 /* 2090 * Timeouts come here. 2091 */ 2092 static void 2093 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 2094 { 2095 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 2096 sessp sp = NG_HOOK_PRIVATE(hook); 2097 negp neg = sp->neg; 2098 struct mbuf *m0 = NULL; 2099 int error = 0; 2100 2101 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", 2102 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); 2103 switch(sp->state) { 2104 /* 2105 * Resend the last packet, using an exponential backoff. 2106 * After a period of time, stop growing the backoff, 2107 * And either leave it, or revert to the start. 2108 */ 2109 case PPPOE_SINIT: 2110 case PPPOE_SREQ: 2111 /* Timeouts on these produce resends. */ 2112 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 2113 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 2114 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 2115 pppoe_ticker, NULL, 0); 2116 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 2117 if (sp->state == PPPOE_SREQ) { 2118 /* Revert to SINIT mode. */ 2119 pppoe_start(sp); 2120 } else { 2121 neg->timeout = PPPOE_TIMEOUT_LIMIT; 2122 } 2123 } 2124 break; 2125 case PPPOE_PRIMED: 2126 case PPPOE_SOFFER: 2127 /* A timeout on these says "give up" */ 2128 ng_rmhook_self(hook); 2129 break; 2130 default: 2131 /* Timeouts have no meaning in other states. */ 2132 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", 2133 node->nd_ID); 2134 } 2135 } 2136 2137 /* 2138 * Parse an incoming packet to see if any tags should be copied to the 2139 * output packet. Don't do any tags that have been handled in the main 2140 * state machine. 2141 */ 2142 static const struct pppoe_tag* 2143 scan_tags(sessp sp, const struct pppoe_hdr* ph) 2144 { 2145 const char *const end = (const char *)next_tag(ph); 2146 const char *ptn; 2147 const struct pppoe_tag *pt = (const void *)(ph + 1); 2148 2149 /* 2150 * Keep processing tags while a tag header will still fit. 2151 */ 2152 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2153 2154 while((const char*)(pt + 1) <= end) { 2155 /* 2156 * If the tag data would go past the end of the packet, abort. 2157 */ 2158 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 2159 if(ptn > end) 2160 return NULL; 2161 2162 switch (pt->tag_type) { 2163 case PTT_RELAY_SID: 2164 insert_tag(sp, pt); 2165 break; 2166 case PTT_EOL: 2167 return NULL; 2168 case PTT_SRV_NAME: 2169 case PTT_AC_NAME: 2170 case PTT_HOST_UNIQ: 2171 case PTT_AC_COOKIE: 2172 case PTT_VENDOR: 2173 case PTT_SRV_ERR: 2174 case PTT_SYS_ERR: 2175 case PTT_GEN_ERR: 2176 case PTT_MAX_PAYL: 2177 case PTT_HURL: 2178 case PTT_MOTM: 2179 break; 2180 } 2181 pt = (const struct pppoe_tag*)ptn; 2182 } 2183 return NULL; 2184 } 2185 2186 static int 2187 pppoe_send_event(sessp sp, enum cmd cmdid) 2188 { 2189 int error; 2190 struct ng_mesg *msg; 2191 struct ngpppoe_sts *sts; 2192 2193 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2194 2195 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 2196 sizeof(struct ngpppoe_sts), M_NOWAIT); 2197 if (msg == NULL) 2198 return (ENOMEM); 2199 sts = (struct ngpppoe_sts *)msg->data; 2200 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 2201 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 2202 return (error); 2203 } 2204