ng_pppoe.c revision 189315
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: head/sys/netgraph/ng_pppoe.c 189315 2009-03-03 18:47:33Z ed $ 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 61MALLOC_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 73static ng_constructor_t ng_pppoe_constructor; 74static ng_rcvmsg_t ng_pppoe_rcvmsg; 75static ng_shutdown_t ng_pppoe_shutdown; 76static ng_newhook_t ng_pppoe_newhook; 77static ng_connect_t ng_pppoe_connect; 78static ng_rcvdata_t ng_pppoe_rcvdata; 79static ng_rcvdata_t ng_pppoe_rcvdata_ether; 80static ng_rcvdata_t ng_pppoe_rcvdata_debug; 81static ng_disconnect_t ng_pppoe_disconnect; 82 83/* Parse type for struct ngpppoe_init_data */ 84static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 85 = NG_PPPOE_INIT_DATA_TYPE_INFO; 86static 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 */ 92static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 93 = NG_PPPOE_STS_TYPE_INFO; 94static 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 */ 100static 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 { 0 } 172}; 173 174/* Netgraph node type descriptor */ 175static struct ng_type typestruct = { 176 .version = NG_ABI_VERSION, 177 .name = NG_PPPOE_NODE_TYPE, 178 .constructor = ng_pppoe_constructor, 179 .rcvmsg = ng_pppoe_rcvmsg, 180 .shutdown = ng_pppoe_shutdown, 181 .newhook = ng_pppoe_newhook, 182 .connect = ng_pppoe_connect, 183 .rcvdata = ng_pppoe_rcvdata, 184 .disconnect = ng_pppoe_disconnect, 185 .cmdlist = ng_pppoe_cmds, 186}; 187NETGRAPH_INIT(pppoe, &typestruct); 188 189/* 190 * States for the session state machine. 191 * These have no meaning if there is no hook attached yet. 192 */ 193enum state { 194 PPPOE_SNONE=0, /* [both] Initial state */ 195 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 196 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 197 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 198 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 199 PPPOE_SREQ, /* [Client] Sent a Request */ 200 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 201 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 202 PPPOE_DEAD /* [Both] */ 203}; 204 205#define NUMTAGS 20 /* number of tags we are set up to work with */ 206 207/* 208 * Information we store for each hook on each node for negotiating the 209 * session. The mbuf and cluster are freed once negotiation has completed. 210 * The whole negotiation block is then discarded. 211 */ 212 213struct sess_neg { 214 struct mbuf *m; /* holds cluster with last sent packet */ 215 union packet *pkt; /* points within the above cluster */ 216 struct callout handle; /* see timeout(9) */ 217 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 218 u_int numtags; 219 const struct pppoe_tag *tags[NUMTAGS]; 220 u_int service_len; 221 u_int ac_name_len; 222 223 struct datatag service; 224 struct datatag ac_name; 225}; 226typedef struct sess_neg *negp; 227 228/* 229 * Session information that is needed after connection. 230 */ 231struct sess_con { 232 hook_p hook; 233 uint16_t Session_ID; 234 enum state state; 235 ng_ID_t creator; /* who to notify */ 236 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 237 negp neg; /* used when negotiating */ 238 LIST_ENTRY(sess_con) sessions; 239}; 240typedef struct sess_con *sessp; 241 242#define SESSHASHSIZE 0x0100 243#define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) 244 245struct sess_hash_entry { 246 struct mtx mtx; 247 LIST_HEAD(hhead, sess_con) head; 248}; 249 250/* 251 * Information we store for each node 252 */ 253struct PPPoE { 254 node_p node; /* back pointer to node */ 255 hook_p ethernet_hook; 256 hook_p debug_hook; 257 u_int packets_in; /* packets in from ethernet */ 258 u_int packets_out; /* packets out towards ethernet */ 259 uint32_t flags; 260#define COMPAT_3COM 0x00000001 261#define COMPAT_DLINK 0x00000002 262 struct ether_header eh; 263 LIST_HEAD(, sess_con) listeners; 264 struct sess_hash_entry sesshash[SESSHASHSIZE]; 265}; 266typedef struct PPPoE *priv_p; 267 268union uniq { 269 char bytes[sizeof(void *)]; 270 void *pointer; 271}; 272 273#define LEAVE(x) do { error = x; goto quit; } while(0) 274static void pppoe_start(sessp sp); 275static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 276static const struct pppoe_tag *scan_tags(sessp sp, 277 const struct pppoe_hdr* ph); 278static int pppoe_send_event(sessp sp, enum cmd cmdid); 279 280/************************************************************************* 281 * Some basic utilities from the Linux version with author's permission.* 282 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 283 ************************************************************************/ 284 285 286 287/* 288 * Return the location where the next tag can be put 289 */ 290static __inline const struct pppoe_tag* 291next_tag(const struct pppoe_hdr* ph) 292{ 293 return (const struct pppoe_tag*)(((const char*)(ph + 1)) 294 + ntohs(ph->length)); 295} 296 297/* 298 * Look for a tag of a specific type. 299 * Don't trust any length the other end says, 300 * but assume we already sanity checked ph->length. 301 */ 302static const struct pppoe_tag* 303get_tag(const struct pppoe_hdr* ph, uint16_t idx) 304{ 305 const char *const end = (const char *)next_tag(ph); 306 const struct pppoe_tag *pt = (const void *)(ph + 1); 307 const char *ptn; 308 309 /* 310 * Keep processing tags while a tag header will still fit. 311 */ 312 while((const char*)(pt + 1) <= end) { 313 /* 314 * If the tag data would go past the end of the packet, abort. 315 */ 316 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 317 if (ptn > end) { 318 CTR2(KTR_NET, "%20s: invalid length for tag %d", 319 __func__, idx); 320 return (NULL); 321 } 322 if (pt->tag_type == idx) { 323 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); 324 return (pt); 325 } 326 327 pt = (const struct pppoe_tag*)ptn; 328 } 329 330 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); 331 return (NULL); 332} 333 334/************************************************************************** 335 * Inlines to initialise or add tags to a session's tag list. 336 **************************************************************************/ 337/* 338 * Initialise the session's tag list. 339 */ 340static void 341init_tags(sessp sp) 342{ 343 KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); 344 sp->neg->numtags = 0; 345} 346 347static void 348insert_tag(sessp sp, const struct pppoe_tag *tp) 349{ 350 negp neg = sp->neg; 351 int i; 352 353 KASSERT(neg != NULL, ("%s: no neg", __func__)); 354 if ((i = neg->numtags++) < NUMTAGS) { 355 neg->tags[i] = tp; 356 } else { 357 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " 358 "packet\n"); 359 neg->numtags--; 360 } 361} 362 363/* 364 * Make up a packet, using the tags filled out for the session. 365 * 366 * Assume that the actual pppoe header and ethernet header 367 * are filled out externally to this routine. 368 * Also assume that neg->wh points to the correct 369 * location at the front of the buffer space. 370 */ 371static void 372make_packet(sessp sp) { 373 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 374 const struct pppoe_tag **tag; 375 char *dp; 376 int count; 377 int tlen; 378 uint16_t length = 0; 379 380 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), 381 ("%s: called from wrong state", __func__)); 382 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 383 384 dp = (char *)(&wh->ph + 1); 385 for (count = 0, tag = sp->neg->tags; 386 ((count < sp->neg->numtags) && (count < NUMTAGS)); 387 tag++, count++) { 388 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 389 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 390 log(LOG_NOTICE, "ng_pppoe: tags too long\n"); 391 sp->neg->numtags = count; 392 break; /* XXX chop off what's too long */ 393 } 394 bcopy(*tag, (char *)dp, tlen); 395 length += tlen; 396 dp += tlen; 397 } 398 wh->ph.length = htons(length); 399 sp->neg->m->m_len = length + sizeof(*wh); 400 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 401} 402 403/************************************************************************** 404 * Routines to match a service. * 405 **************************************************************************/ 406 407/* 408 * Find a hook that has a service string that matches that 409 * we are seeking. For now use a simple string. 410 * In the future we may need something like regexp(). 411 * 412 * Null string is a wildcard (ANY service), according to RFC2516. 413 * And historical FreeBSD wildcard is also "*". 414 */ 415 416static hook_p 417pppoe_match_svc(node_p node, const struct pppoe_tag *tag) 418{ 419 const priv_p privp = NG_NODE_PRIVATE(node); 420 sessp sp; 421 422 LIST_FOREACH(sp, &privp->listeners, sessions) { 423 negp neg = sp->neg; 424 425 /* Empty Service-Name matches any service. */ 426 if (neg->service_len == 0) 427 break; 428 429 /* Special case for a blank or "*" service name (wildcard). */ 430 if (neg->service_len == 1 && neg->service.data[0] == '*') 431 break; 432 433 /* If the lengths don't match, that aint it. */ 434 if (neg->service_len != ntohs(tag->tag_len)) 435 continue; 436 437 if (strncmp((const char *)(tag + 1), neg->service.data, 438 ntohs(tag->tag_len)) == 0) 439 break; 440 } 441 CTR3(KTR_NET, "%20s: matched %p for %s", __func__, 442 sp?sp->hook:NULL, (const char *)(tag + 1)); 443 444 return (sp?sp->hook:NULL); 445} 446 447/* 448 * Broadcast the PADI packet in m0 to all listening hooks. 449 * This routine is called when a PADI with empty Service-Name 450 * tag is received. Client should receive PADOs with all 451 * available services. 452 */ 453static int 454pppoe_broadcast_padi(node_p node, struct mbuf *m0) 455{ 456 const priv_p privp = NG_NODE_PRIVATE(node); 457 sessp sp; 458 int error = 0; 459 460 LIST_FOREACH(sp, &privp->listeners, sessions) { 461 struct mbuf *m; 462 463 m = m_dup(m0, M_DONTWAIT); 464 if (m == NULL) 465 return (ENOMEM); 466 NG_SEND_DATA_ONLY(error, sp->hook, m); 467 if (error) 468 return (error); 469 } 470 471 return (0); 472} 473 474/* 475 * Find a hook, which name equals to given service. 476 */ 477static hook_p 478pppoe_find_svc(node_p node, const char *svc_name, int svc_len) 479{ 480 const priv_p privp = NG_NODE_PRIVATE(node); 481 sessp sp; 482 483 LIST_FOREACH(sp, &privp->listeners, sessions) { 484 negp neg = sp->neg; 485 486 if (neg->service_len == svc_len && 487 strncmp(svc_name, neg->service.data, svc_len) == 0) 488 return (sp->hook); 489 } 490 491 return (NULL); 492} 493 494/************************************************************************** 495 * Routines to find a particular session that matches an incoming packet. * 496 **************************************************************************/ 497/* Find free session and add to hash. */ 498static uint16_t 499pppoe_getnewsession(sessp sp) 500{ 501 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 502 static uint16_t pppoe_sid = 1; 503 sessp tsp; 504 uint16_t val, hash; 505 506restart: 507 /* Atomicity is not needed here as value will be checked. */ 508 val = pppoe_sid++; 509 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ 510 if (val == 0xffff || val == 0x0000) 511 val = pppoe_sid = 1; 512 513 /* Check it isn't already in use. */ 514 hash = SESSHASH(val); 515 mtx_lock(&privp->sesshash[hash].mtx); 516 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { 517 if (tsp->Session_ID == val) 518 break; 519 } 520 if (!tsp) { 521 sp->Session_ID = val; 522 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 523 } 524 mtx_unlock(&privp->sesshash[hash].mtx); 525 if (tsp) 526 goto restart; 527 528 CTR2(KTR_NET, "%20s: new sid %d", __func__, val); 529 530 return (val); 531} 532 533/* Add specified session to hash. */ 534static void 535pppoe_addsession(sessp sp) 536{ 537 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 538 uint16_t hash = SESSHASH(sp->Session_ID); 539 540 mtx_lock(&privp->sesshash[hash].mtx); 541 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 542 mtx_unlock(&privp->sesshash[hash].mtx); 543} 544 545/* Delete specified session from hash. */ 546static void 547pppoe_delsession(sessp sp) 548{ 549 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 550 uint16_t hash = SESSHASH(sp->Session_ID); 551 552 mtx_lock(&privp->sesshash[hash].mtx); 553 LIST_REMOVE(sp, sessions); 554 mtx_unlock(&privp->sesshash[hash].mtx); 555} 556 557/* Find matching peer/session combination. */ 558static sessp 559pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) 560{ 561 uint16_t session = ntohs(wh->ph.sid); 562 uint16_t hash = SESSHASH(session); 563 sessp sp = NULL; 564 565 mtx_lock(&privp->sesshash[hash].mtx); 566 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { 567 if (sp->Session_ID == session && 568 bcmp(sp->pkt_hdr.eh.ether_dhost, 569 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { 570 break; 571 } 572 } 573 mtx_unlock(&privp->sesshash[hash].mtx); 574 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, 575 session); 576 577 return (sp); 578} 579 580static hook_p 581pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 582{ 583 hook_p hook = NULL; 584 union uniq uniq; 585 586 bcopy(tag + 1, uniq.bytes, sizeof(void *)); 587 /* Cycle through all known hooks. */ 588 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 589 /* Skip any nonsession hook. */ 590 if (NG_HOOK_PRIVATE(hook) == NULL) 591 continue; 592 if (uniq.pointer == NG_HOOK_PRIVATE(hook)) 593 break; 594 } 595 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.pointer); 596 597 return (hook); 598} 599 600/************************************************************************** 601 * Start of Netgraph entrypoints. * 602 **************************************************************************/ 603 604/* 605 * Allocate the private data structure and link it with node. 606 */ 607static int 608ng_pppoe_constructor(node_p node) 609{ 610 priv_p privp; 611 int i; 612 613 /* Initialize private descriptor. */ 614 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 615 if (privp == NULL) 616 return (ENOMEM); 617 618 /* Link structs together; this counts as our one reference to *node. */ 619 NG_NODE_SET_PRIVATE(node, privp); 620 privp->node = node; 621 622 /* Initialize to standard mode. */ 623 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); 624 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 625 626 LIST_INIT(&privp->listeners); 627 for (i = 0; i < SESSHASHSIZE; i++) { 628 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); 629 LIST_INIT(&privp->sesshash[i].head); 630 } 631 632 CTR3(KTR_NET, "%20s: created node [%x] (%p)", 633 __func__, node->nd_ID, node); 634 635 return (0); 636} 637 638/* 639 * Give our ok for a hook to be added... 640 * point the hook's private info to the hook structure. 641 * 642 * The following hook names are special: 643 * "ethernet": the hook that should be connected to a NIC. 644 * "debug": copies of data sent out here (when I write the code). 645 * All other hook names need only be unique. (the framework checks this). 646 */ 647static int 648ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 649{ 650 const priv_p privp = NG_NODE_PRIVATE(node); 651 sessp sp; 652 653 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 654 privp->ethernet_hook = hook; 655 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); 656 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 657 privp->debug_hook = hook; 658 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); 659 } else { 660 /* 661 * Any other unique name is OK. 662 * The infrastructure has already checked that it's unique, 663 * so just allocate it and hook it in. 664 */ 665 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 666 if (sp == NULL) 667 return (ENOMEM); 668 669 NG_HOOK_SET_PRIVATE(hook, sp); 670 sp->hook = hook; 671 } 672 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", 673 __func__, node->nd_ID, node, name, hook); 674 675 return(0); 676} 677 678/* 679 * Hook has been added successfully. Request the MAC address of 680 * the underlying Ethernet node. 681 */ 682static int 683ng_pppoe_connect(hook_p hook) 684{ 685 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 686 struct ng_mesg *msg; 687 int error; 688 689 if (hook != privp->ethernet_hook) 690 return (0); 691 692 /* 693 * If this is Ethernet hook, then request MAC address 694 * from our downstream. 695 */ 696 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); 697 if (msg == NULL) 698 return (ENOBUFS); 699 700 /* 701 * Our hook and peer hook have HK_INVALID flag set, 702 * so we can't use NG_SEND_MSG_HOOK() macro here. 703 */ 704 NG_SEND_MSG_ID(error, privp->node, msg, 705 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), 706 NG_NODE_ID(privp->node)); 707 708 return (error); 709} 710/* 711 * Get a netgraph control message. 712 * Check it is one we understand. If needed, send a response. 713 * We sometimes save the address for an async action later. 714 * Always free the message. 715 */ 716static int 717ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 718{ 719 priv_p privp = NG_NODE_PRIVATE(node); 720 struct ngpppoe_init_data *ourmsg = NULL; 721 struct ng_mesg *resp = NULL; 722 int error = 0; 723 hook_p hook = NULL; 724 sessp sp = NULL; 725 negp neg = NULL; 726 struct ng_mesg *msg; 727 728 NGI_GET_MSG(item, msg); 729 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", 730 __func__, node->nd_ID, node, msg->header.cmd, 731 msg->header.typecookie); 732 733 /* Deal with message according to cookie and command. */ 734 switch (msg->header.typecookie) { 735 case NGM_PPPOE_COOKIE: 736 switch (msg->header.cmd) { 737 case NGM_PPPOE_CONNECT: 738 case NGM_PPPOE_LISTEN: 739 case NGM_PPPOE_OFFER: 740 case NGM_PPPOE_SERVICE: 741 ourmsg = (struct ngpppoe_init_data *)msg->data; 742 if (msg->header.arglen < sizeof(*ourmsg)) { 743 log(LOG_ERR, "ng_pppoe[%x]: init data too " 744 "small\n", node->nd_ID); 745 LEAVE(EMSGSIZE); 746 } 747 if (msg->header.arglen - sizeof(*ourmsg) > 748 PPPOE_SERVICE_NAME_SIZE) { 749 log(LOG_ERR, "ng_pppoe[%x]: service name " 750 "too big\n", node->nd_ID); 751 LEAVE(EMSGSIZE); 752 } 753 if (msg->header.arglen - sizeof(*ourmsg) < 754 ourmsg->data_len) { 755 log(LOG_ERR, "ng_pppoe[%x]: init data has bad " 756 "length, %d should be %zd\n", node->nd_ID, 757 ourmsg->data_len, 758 msg->header.arglen - sizeof (*ourmsg)); 759 LEAVE(EMSGSIZE); 760 } 761 762 /* Make sure strcmp will terminate safely. */ 763 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 764 765 /* Find hook by name. */ 766 hook = ng_findhook(node, ourmsg->hook); 767 if (hook == NULL) 768 LEAVE(ENOENT); 769 770 sp = NG_HOOK_PRIVATE(hook); 771 if (sp == NULL) 772 LEAVE(EINVAL); 773 774 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 775 /* 776 * Ensure we aren't already listening for this 777 * service. 778 */ 779 if (pppoe_find_svc(node, ourmsg->data, 780 ourmsg->data_len) != NULL) 781 LEAVE(EEXIST); 782 } 783 784 /* 785 * PPPOE_SERVICE advertisments are set up 786 * on sessions that are in PRIMED state. 787 */ 788 if (msg->header.cmd == NGM_PPPOE_SERVICE) 789 break; 790 791 if (sp->state != PPPOE_SNONE) { 792 log(LOG_NOTICE, "ng_pppoe[%x]: Session already " 793 "active\n", node->nd_ID); 794 LEAVE(EISCONN); 795 } 796 797 /* 798 * Set up prototype header. 799 */ 800 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, 801 M_NOWAIT | M_ZERO); 802 803 if (neg == NULL) 804 LEAVE(ENOMEM); 805 806 neg->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 807 if (neg->m == NULL) { 808 free(neg, M_NETGRAPH_PPPOE); 809 LEAVE(ENOBUFS); 810 } 811 neg->m->m_pkthdr.rcvif = NULL; 812 sp->neg = neg; 813 ng_callout_init(&neg->handle); 814 neg->m->m_len = sizeof(struct pppoe_full_hdr); 815 neg->pkt = mtod(neg->m, union packet*); 816 memcpy((void *)&neg->pkt->pkt_header.eh, 817 &privp->eh, sizeof(struct ether_header)); 818 neg->pkt->pkt_header.ph.ver = 0x1; 819 neg->pkt->pkt_header.ph.type = 0x1; 820 neg->pkt->pkt_header.ph.sid = 0x0000; 821 neg->timeout = 0; 822 823 sp->creator = NGI_RETADDR(item); 824 } 825 switch (msg->header.cmd) { 826 case NGM_PPPOE_GET_STATUS: 827 { 828 struct ngpppoestat *stats; 829 830 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 831 if (!resp) 832 LEAVE(ENOMEM); 833 834 stats = (struct ngpppoestat *) resp->data; 835 stats->packets_in = privp->packets_in; 836 stats->packets_out = privp->packets_out; 837 break; 838 } 839 case NGM_PPPOE_CONNECT: 840 { 841 /* 842 * Check the hook exists and is Uninitialised. 843 * Send a PADI request, and start the timeout logic. 844 * Store the originator of this message so we can send 845 * a success of fail message to them later. 846 * Move the session to SINIT. 847 * Set up the session to the correct state and 848 * start it. 849 */ 850 int i, acnlen = 0, acnsep = 0, srvlen; 851 for (i = 0; i < ourmsg->data_len; i++) { 852 if (ourmsg->data[i] == '\\') { 853 acnlen = i; 854 acnsep = 1; 855 break; 856 } 857 } 858 srvlen = ourmsg->data_len - acnlen - acnsep; 859 860 bcopy(ourmsg->data, neg->ac_name.data, acnlen); 861 neg->ac_name_len = acnlen; 862 863 neg->service.hdr.tag_type = PTT_SRV_NAME; 864 neg->service.hdr.tag_len = htons((uint16_t)srvlen); 865 bcopy(ourmsg->data + acnlen + acnsep, 866 neg->service.data, srvlen); 867 neg->service_len = srvlen; 868 pppoe_start(sp); 869 break; 870 } 871 case NGM_PPPOE_LISTEN: 872 /* 873 * Check the hook exists and is Uninitialised. 874 * Install the service matching string. 875 * Store the originator of this message so we can send 876 * a success of fail message to them later. 877 * Move the hook to 'LISTENING' 878 */ 879 neg->service.hdr.tag_type = PTT_SRV_NAME; 880 neg->service.hdr.tag_len = 881 htons((uint16_t)ourmsg->data_len); 882 883 if (ourmsg->data_len) 884 bcopy(ourmsg->data, neg->service.data, 885 ourmsg->data_len); 886 neg->service_len = ourmsg->data_len; 887 neg->pkt->pkt_header.ph.code = PADT_CODE; 888 /* 889 * Wait for PADI packet coming from Ethernet. 890 */ 891 sp->state = PPPOE_LISTENING; 892 LIST_INSERT_HEAD(&privp->listeners, sp, sessions); 893 break; 894 case NGM_PPPOE_OFFER: 895 /* 896 * Check the hook exists and is Uninitialised. 897 * Store the originator of this message so we can send 898 * a success of fail message to them later. 899 * Store the AC-Name given and go to PRIMED. 900 */ 901 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 902 neg->ac_name.hdr.tag_len = 903 htons((uint16_t)ourmsg->data_len); 904 if (ourmsg->data_len) 905 bcopy(ourmsg->data, neg->ac_name.data, 906 ourmsg->data_len); 907 neg->ac_name_len = ourmsg->data_len; 908 neg->pkt->pkt_header.ph.code = PADO_CODE; 909 /* 910 * Wait for PADI packet coming from hook. 911 */ 912 sp->state = PPPOE_PRIMED; 913 break; 914 case NGM_PPPOE_SERVICE: 915 /* 916 * Check the session is primed. 917 * for now just allow ONE service to be advertised. 918 * If you do it twice you just overwrite. 919 */ 920 if (sp->state != PPPOE_PRIMED) { 921 log(LOG_NOTICE, "ng_pppoe[%x]: session not " 922 "primed\n", node->nd_ID); 923 LEAVE(EISCONN); 924 } 925 neg = sp->neg; 926 neg->service.hdr.tag_type = PTT_SRV_NAME; 927 neg->service.hdr.tag_len = 928 htons((uint16_t)ourmsg->data_len); 929 930 if (ourmsg->data_len) 931 bcopy(ourmsg->data, neg->service.data, 932 ourmsg->data_len); 933 neg->service_len = ourmsg->data_len; 934 break; 935 case NGM_PPPOE_SETMODE: 936 { 937 char *s; 938 size_t len; 939 940 if (msg->header.arglen == 0) 941 LEAVE(EINVAL); 942 943 s = (char *)msg->data; 944 len = msg->header.arglen - 1; 945 946 /* Search for matching mode string. */ 947 if (len == strlen(NG_PPPOE_STANDARD) && 948 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { 949 privp->flags = 0; 950 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 951 break; 952 } 953 if (len == strlen(NG_PPPOE_3COM) && 954 (strncmp(NG_PPPOE_3COM, s, len) == 0)) { 955 privp->flags |= COMPAT_3COM; 956 privp->eh.ether_type = 957 ETHERTYPE_PPPOE_3COM_DISC; 958 break; 959 } 960 if (len == strlen(NG_PPPOE_DLINK) && 961 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { 962 privp->flags |= COMPAT_DLINK; 963 break; 964 } 965 error = EINVAL; 966 break; 967 } 968 case NGM_PPPOE_GETMODE: 969 { 970 char *s; 971 size_t len = 0; 972 973 if (privp->flags == 0) 974 len += strlen(NG_PPPOE_STANDARD) + 1; 975 if (privp->flags & COMPAT_3COM) 976 len += strlen(NG_PPPOE_3COM) + 1; 977 if (privp->flags & COMPAT_DLINK) 978 len += strlen(NG_PPPOE_DLINK) + 1; 979 980 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 981 if (resp == NULL) 982 LEAVE(ENOMEM); 983 984 s = (char *)resp->data; 985 if (privp->flags == 0) { 986 len = strlen(NG_PPPOE_STANDARD); 987 strlcpy(s, NG_PPPOE_STANDARD, len + 1); 988 break; 989 } 990 if (privp->flags & COMPAT_3COM) { 991 len = strlen(NG_PPPOE_3COM); 992 strlcpy(s, NG_PPPOE_3COM, len + 1); 993 s += len; 994 } 995 if (privp->flags & COMPAT_DLINK) { 996 if (s != resp->data) 997 *s++ = '|'; 998 len = strlen(NG_PPPOE_DLINK); 999 strlcpy(s, NG_PPPOE_DLINK, len + 1); 1000 } 1001 break; 1002 } 1003 case NGM_PPPOE_SETENADDR: 1004 if (msg->header.arglen != ETHER_ADDR_LEN) 1005 LEAVE(EINVAL); 1006 bcopy(msg->data, &privp->eh.ether_shost, 1007 ETHER_ADDR_LEN); 1008 break; 1009 default: 1010 LEAVE(EINVAL); 1011 } 1012 break; 1013 case NGM_ETHER_COOKIE: 1014 if (!(msg->header.flags & NGF_RESP)) 1015 LEAVE(EINVAL); 1016 switch (msg->header.cmd) { 1017 case NGM_ETHER_GET_ENADDR: 1018 if (msg->header.arglen != ETHER_ADDR_LEN) 1019 LEAVE(EINVAL); 1020 bcopy(msg->data, &privp->eh.ether_shost, 1021 ETHER_ADDR_LEN); 1022 break; 1023 default: 1024 LEAVE(EINVAL); 1025 } 1026 break; 1027 default: 1028 LEAVE(EINVAL); 1029 } 1030 1031 /* Take care of synchronous response, if any. */ 1032quit: 1033 CTR2(KTR_NET, "%20s: returning %d", __func__, error); 1034 NG_RESPOND_MSG(error, node, item, resp); 1035 /* Free the message and return. */ 1036 NG_FREE_MSG(msg); 1037 return(error); 1038} 1039 1040/* 1041 * Start a client into the first state. A separate function because 1042 * it can be needed if the negotiation times out. 1043 */ 1044static void 1045pppoe_start(sessp sp) 1046{ 1047 hook_p hook = sp->hook; 1048 node_p node = NG_HOOK_NODE(hook); 1049 priv_p privp = NG_NODE_PRIVATE(node); 1050 negp neg = sp->neg; 1051 struct { 1052 struct pppoe_tag hdr; 1053 union uniq data; 1054 } __packed uniqtag; 1055 struct mbuf *m0; 1056 int error; 1057 1058 /* 1059 * Kick the state machine into starting up. 1060 */ 1061 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1062 sp->state = PPPOE_SINIT; 1063 /* 1064 * Reset the packet header to broadcast. Since we are 1065 * in a client mode use configured ethertype. 1066 */ 1067 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, 1068 sizeof(struct ether_header)); 1069 neg->pkt->pkt_header.ph.code = PADI_CODE; 1070 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 1071 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 1072 uniqtag.data.pointer = sp; 1073 init_tags(sp); 1074 insert_tag(sp, &uniqtag.hdr); 1075 insert_tag(sp, &neg->service.hdr); 1076 make_packet(sp); 1077 /* 1078 * Send packet and prepare to retransmit it after timeout. 1079 */ 1080 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1081 pppoe_ticker, NULL, 0); 1082 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1083 m0 = m_copypacket(neg->m, M_DONTWAIT); 1084 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); 1085} 1086 1087static int 1088send_acname(sessp sp, const struct pppoe_tag *tag) 1089{ 1090 int error, tlen; 1091 struct ng_mesg *msg; 1092 struct ngpppoe_sts *sts; 1093 1094 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1095 1096 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 1097 sizeof(struct ngpppoe_sts), M_NOWAIT); 1098 if (msg == NULL) 1099 return (ENOMEM); 1100 1101 sts = (struct ngpppoe_sts *)msg->data; 1102 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1103 strncpy(sts->hook, (const char *)(tag + 1), tlen); 1104 sts->hook[tlen] = '\0'; 1105 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1106 1107 return (error); 1108} 1109 1110static int 1111send_sessionid(sessp sp) 1112{ 1113 int error; 1114 struct ng_mesg *msg; 1115 1116 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1117 1118 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1119 sizeof(uint16_t), M_NOWAIT); 1120 if (msg == NULL) 1121 return (ENOMEM); 1122 1123 *(uint16_t *)msg->data = sp->Session_ID; 1124 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1125 1126 return (error); 1127} 1128 1129/* 1130 * Receive data from session hook and do something with it. 1131 */ 1132static int 1133ng_pppoe_rcvdata(hook_p hook, item_p item) 1134{ 1135 node_p node = NG_HOOK_NODE(hook); 1136 const priv_p privp = NG_NODE_PRIVATE(node); 1137 sessp sp = NG_HOOK_PRIVATE(hook); 1138 struct pppoe_full_hdr *wh; 1139 struct mbuf *m; 1140 int error; 1141 1142 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1143 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1144 1145 NGI_GET_M(item, m); 1146 switch (sp->state) { 1147 case PPPOE_NEWCONNECTED: 1148 case PPPOE_CONNECTED: { 1149 /* 1150 * Remove PPP address and control fields, if any. 1151 * For example, ng_ppp(4) always sends LCP packets 1152 * with address and control fields as required by 1153 * generic PPP. PPPoE is an exception to the rule. 1154 */ 1155 if (m->m_pkthdr.len >= 2) { 1156 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1157 LEAVE(ENOBUFS); 1158 if (mtod(m, u_char *)[0] == 0xff && 1159 mtod(m, u_char *)[1] == 0x03) 1160 m_adj(m, 2); 1161 } 1162 /* 1163 * Bang in a pre-made header, and set the length up 1164 * to be correct. Then send it to the ethernet driver. 1165 */ 1166 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1167 if (m == NULL) 1168 LEAVE(ENOBUFS); 1169 1170 wh = mtod(m, struct pppoe_full_hdr *); 1171 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1172 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh)); 1173 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m); 1174 privp->packets_out++; 1175 break; 1176 } 1177 case PPPOE_PRIMED: { 1178 struct { 1179 struct pppoe_tag hdr; 1180 union uniq data; 1181 } __packed uniqtag; 1182 const struct pppoe_tag *tag; 1183 struct mbuf *m0; 1184 const struct pppoe_hdr *ph; 1185 negp neg = sp->neg; 1186 uint16_t session; 1187 uint16_t length; 1188 uint8_t code; 1189 1190 /* 1191 * A PADI packet is being returned by the application 1192 * that has set up this hook. This indicates that it 1193 * wants us to offer service. 1194 */ 1195 if (m->m_len < sizeof(*wh)) { 1196 m = m_pullup(m, sizeof(*wh)); 1197 if (m == NULL) 1198 LEAVE(ENOBUFS); 1199 } 1200 wh = mtod(m, struct pppoe_full_hdr *); 1201 ph = &wh->ph; 1202 session = ntohs(wh->ph.sid); 1203 length = ntohs(wh->ph.length); 1204 code = wh->ph.code; 1205 /* Use peers mode in session. */ 1206 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1207 if (code != PADI_CODE) 1208 LEAVE(EINVAL); 1209 ng_uncallout(&neg->handle, node); 1210 1211 /* 1212 * This is the first time we hear 1213 * from the client, so note it's 1214 * unicast address, replacing the 1215 * broadcast address. 1216 */ 1217 bcopy(wh->eh.ether_shost, 1218 neg->pkt->pkt_header.eh.ether_dhost, 1219 ETHER_ADDR_LEN); 1220 sp->state = PPPOE_SOFFER; 1221 neg->timeout = 0; 1222 neg->pkt->pkt_header.ph.code = PADO_CODE; 1223 1224 /* 1225 * Start working out the tags to respond with. 1226 */ 1227 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1228 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1229 uniqtag.data.pointer = sp; 1230 init_tags(sp); 1231 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1232 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1233 insert_tag(sp, tag); /* return service */ 1234 /* 1235 * If we have a NULL service request 1236 * and have an extra service defined in this hook, 1237 * then also add a tag for the extra service. 1238 * XXX this is a hack. eventually we should be able 1239 * to support advertising many services, not just one 1240 */ 1241 if (((tag == NULL) || (tag->tag_len == 0)) && 1242 (neg->service.hdr.tag_len != 0)) { 1243 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1244 } 1245 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1246 insert_tag(sp, tag); /* returned hostunique */ 1247 insert_tag(sp, &uniqtag.hdr); 1248 scan_tags(sp, ph); 1249 make_packet(sp); 1250 /* 1251 * Send the offer but if they don't respond 1252 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1253 */ 1254 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1255 pppoe_ticker, NULL, 0); 1256 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1257 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1258 privp->packets_out++; 1259 break; 1260 } 1261 1262 /* 1263 * Packets coming from the hook make no sense 1264 * to sessions in the rest of states. Throw them away. 1265 */ 1266 default: 1267 LEAVE(ENETUNREACH); 1268 } 1269quit: 1270 if (item) 1271 NG_FREE_ITEM(item); 1272 NG_FREE_M(m); 1273 return (error); 1274} 1275 1276/* 1277 * Receive data from ether and do something with it. 1278 */ 1279static int 1280ng_pppoe_rcvdata_ether(hook_p hook, item_p item) 1281{ 1282 node_p node = NG_HOOK_NODE(hook); 1283 const priv_p privp = NG_NODE_PRIVATE(node); 1284 sessp sp = NG_HOOK_PRIVATE(hook); 1285 const struct pppoe_tag *utag = NULL, *tag = NULL; 1286 const struct pppoe_full_hdr *wh; 1287 const struct pppoe_hdr *ph; 1288 negp neg = NULL; 1289 struct mbuf *m; 1290 hook_p sendhook; 1291 int error = 0; 1292 uint16_t session; 1293 uint16_t length; 1294 uint8_t code; 1295 struct mbuf *m0; 1296 1297 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1298 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1299 1300 NGI_GET_M(item, m); 1301 /* 1302 * Dig out various fields from the packet. 1303 * Use them to decide where to send it. 1304 */ 1305 privp->packets_in++; 1306 if( m->m_len < sizeof(*wh)) { 1307 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1308 if (m == NULL) { 1309 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " 1310 "m_pullup(wh)\n", node->nd_ID); 1311 LEAVE(ENOBUFS); 1312 } 1313 } 1314 wh = mtod(m, struct pppoe_full_hdr *); 1315 length = ntohs(wh->ph.length); 1316 switch(wh->eh.ether_type) { 1317 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ 1318 case ETHERTYPE_PPPOE_DISC: 1319 /* 1320 * We need to try to make sure that the tag area 1321 * is contiguous, or we could wander off the end 1322 * of a buffer and make a mess. 1323 * (Linux wouldn't have this problem). 1324 */ 1325 if (m->m_pkthdr.len <= MHLEN) { 1326 if( m->m_len < m->m_pkthdr.len) { 1327 m = m_pullup(m, m->m_pkthdr.len); 1328 if (m == NULL) { 1329 log(LOG_NOTICE, "ng_pppoe[%x]: " 1330 "couldn't m_pullup(pkthdr)\n", 1331 node->nd_ID); 1332 LEAVE(ENOBUFS); 1333 } 1334 } 1335 } 1336 if (m->m_len != m->m_pkthdr.len) { 1337 /* 1338 * It's not all in one piece. 1339 * We need to do extra work. 1340 * Put it into a cluster. 1341 */ 1342 struct mbuf *n; 1343 n = m_dup(m, M_DONTWAIT); 1344 m_freem(m); 1345 m = n; 1346 if (m) { 1347 /* just check we got a cluster */ 1348 if (m->m_len != m->m_pkthdr.len) { 1349 m_freem(m); 1350 m = NULL; 1351 } 1352 } 1353 if (m == NULL) { 1354 log(LOG_NOTICE, "ng_pppoe[%x]: packet " 1355 "fragmented\n", node->nd_ID); 1356 LEAVE(EMSGSIZE); 1357 } 1358 } 1359 wh = mtod(m, struct pppoe_full_hdr *); 1360 length = ntohs(wh->ph.length); 1361 ph = &wh->ph; 1362 session = ntohs(wh->ph.sid); 1363 code = wh->ph.code; 1364 1365 switch(code) { 1366 case PADI_CODE: 1367 /* 1368 * We are a server: 1369 * Look for a hook with the required service and send 1370 * the ENTIRE packet up there. It should come back to 1371 * a new hook in PRIMED state. Look there for further 1372 * processing. 1373 */ 1374 tag = get_tag(ph, PTT_SRV_NAME); 1375 if (tag == NULL) { 1376 CTR1(KTR_NET, "%20s: PADI w/o Service-Name", 1377 __func__); 1378 LEAVE(ENETUNREACH); 1379 } 1380 1381 /* 1382 * First, try to match Service-Name against our 1383 * listening hooks. If no success and we are in D-Link 1384 * compat mode and Service-Name is empty, then we 1385 * broadcast the PADI to all listening hooks. 1386 */ 1387 sendhook = pppoe_match_svc(node, tag); 1388 if (sendhook != NULL) 1389 NG_FWD_NEW_DATA(error, item, sendhook, m); 1390 else if (privp->flags & COMPAT_DLINK && 1391 ntohs(tag->tag_len) == 0) 1392 error = pppoe_broadcast_padi(node, m); 1393 else 1394 error = ENETUNREACH; 1395 break; 1396 case PADO_CODE: 1397 /* 1398 * We are a client: 1399 * Use the host_uniq tag to find the hook this is in 1400 * response to. Received #2, now send #3 1401 * For now simply accept the first we receive. 1402 */ 1403 utag = get_tag(ph, PTT_HOST_UNIQ); 1404 if ((utag == NULL) || 1405 (ntohs(utag->tag_len) != sizeof(sp))) { 1406 log(LOG_NOTICE, "ng_pppoe[%x]: no host " 1407 "unique field\n", node->nd_ID); 1408 LEAVE(ENETUNREACH); 1409 } 1410 1411 sendhook = pppoe_finduniq(node, utag); 1412 if (sendhook == NULL) { 1413 log(LOG_NOTICE, "ng_pppoe[%x]: no " 1414 "matching session\n", node->nd_ID); 1415 LEAVE(ENETUNREACH); 1416 } 1417 1418 /* 1419 * Check the session is in the right state. 1420 * It needs to be in PPPOE_SINIT. 1421 */ 1422 sp = NG_HOOK_PRIVATE(sendhook); 1423 if (sp->state == PPPOE_SREQ || 1424 sp->state == PPPOE_CONNECTED) { 1425 break; /* Multiple PADO is OK. */ 1426 } 1427 if (sp->state != PPPOE_SINIT) { 1428 log(LOG_NOTICE, "ng_pppoe[%x]: session " 1429 "in wrong state\n", node->nd_ID); 1430 LEAVE(ENETUNREACH); 1431 } 1432 neg = sp->neg; 1433 /* If requested specific AC-name, check it. */ 1434 if (neg->ac_name_len) { 1435 tag = get_tag(ph, PTT_AC_NAME); 1436 if (!tag) { 1437 /* No PTT_AC_NAME in PADO */ 1438 break; 1439 } 1440 if (neg->ac_name_len != htons(tag->tag_len) || 1441 strncmp(neg->ac_name.data, 1442 (const char *)(tag + 1), 1443 neg->ac_name_len) != 0) { 1444 break; 1445 } 1446 } 1447 sp->state = PPPOE_SREQ; 1448 ng_uncallout(&neg->handle, node); 1449 1450 /* 1451 * This is the first time we hear 1452 * from the server, so note it's 1453 * unicast address, replacing the 1454 * broadcast address . 1455 */ 1456 bcopy(wh->eh.ether_shost, 1457 neg->pkt->pkt_header.eh.ether_dhost, 1458 ETHER_ADDR_LEN); 1459 neg->timeout = 0; 1460 neg->pkt->pkt_header.ph.code = PADR_CODE; 1461 init_tags(sp); 1462 insert_tag(sp, utag); /* Host Unique */ 1463 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1464 insert_tag(sp, tag); /* return cookie */ 1465 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1466 insert_tag(sp, tag); /* return it */ 1467 send_acname(sp, tag); 1468 } 1469 insert_tag(sp, &neg->service.hdr); /* Service */ 1470 scan_tags(sp, ph); 1471 make_packet(sp); 1472 sp->state = PPPOE_SREQ; 1473 ng_callout(&neg->handle, node, sp->hook, 1474 PPPOE_INITIAL_TIMEOUT * hz, 1475 pppoe_ticker, NULL, 0); 1476 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1477 m0 = m_copypacket(neg->m, M_DONTWAIT); 1478 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1479 break; 1480 case PADR_CODE: 1481 /* 1482 * We are a server: 1483 * Use the ac_cookie tag to find the 1484 * hook this is in response to. 1485 */ 1486 utag = get_tag(ph, PTT_AC_COOKIE); 1487 if ((utag == NULL) || 1488 (ntohs(utag->tag_len) != sizeof(sp))) { 1489 LEAVE(ENETUNREACH); 1490 } 1491 1492 sendhook = pppoe_finduniq(node, utag); 1493 if (sendhook == NULL) 1494 LEAVE(ENETUNREACH); 1495 1496 /* 1497 * Check the session is in the right state. 1498 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. 1499 * If the latter, then this is a retry by the client, 1500 * so be nice, and resend. 1501 */ 1502 sp = NG_HOOK_PRIVATE(sendhook); 1503 if (sp->state == PPPOE_NEWCONNECTED) { 1504 /* 1505 * Whoa! drop back to resend that PADS packet. 1506 * We should still have a copy of it. 1507 */ 1508 sp->state = PPPOE_SOFFER; 1509 } else if (sp->state != PPPOE_SOFFER) 1510 LEAVE (ENETUNREACH); 1511 neg = sp->neg; 1512 ng_uncallout(&neg->handle, node); 1513 neg->pkt->pkt_header.ph.code = PADS_CODE; 1514 if (sp->Session_ID == 0) { 1515 neg->pkt->pkt_header.ph.sid = 1516 htons(pppoe_getnewsession(sp)); 1517 } 1518 send_sessionid(sp); 1519 neg->timeout = 0; 1520 /* 1521 * start working out the tags to respond with. 1522 */ 1523 init_tags(sp); 1524 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1525 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1526 insert_tag(sp, tag);/* return service */ 1527 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1528 insert_tag(sp, tag); /* return it */ 1529 insert_tag(sp, utag); /* ac_cookie */ 1530 scan_tags(sp, ph); 1531 make_packet(sp); 1532 sp->state = PPPOE_NEWCONNECTED; 1533 1534 /* Send the PADS without a timeout - we're now connected. */ 1535 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1536 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1537 1538 /* 1539 * Having sent the last Negotiation header, 1540 * Set up the stored packet header to be correct for 1541 * the actual session. But keep the negotialtion stuff 1542 * around in case we need to resend this last packet. 1543 * We'll discard it when we move from NEWCONNECTED 1544 * to CONNECTED 1545 */ 1546 sp->pkt_hdr = neg->pkt->pkt_header; 1547 /* Configure ethertype depending on what 1548 * ethertype was used at discovery phase */ 1549 if (sp->pkt_hdr.eh.ether_type == 1550 ETHERTYPE_PPPOE_3COM_DISC) 1551 sp->pkt_hdr.eh.ether_type 1552 = ETHERTYPE_PPPOE_3COM_SESS; 1553 else 1554 sp->pkt_hdr.eh.ether_type 1555 = ETHERTYPE_PPPOE_SESS; 1556 sp->pkt_hdr.ph.code = 0; 1557 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1558 break; 1559 case PADS_CODE: 1560 /* 1561 * We are a client: 1562 * Use the host_uniq tag to find the hook this is in 1563 * response to. Take the session ID and store it away. 1564 * Also make sure the pre-made header is correct and 1565 * set us into Session mode. 1566 */ 1567 utag = get_tag(ph, PTT_HOST_UNIQ); 1568 if ((utag == NULL) || 1569 (ntohs(utag->tag_len) != sizeof(sp))) { 1570 LEAVE (ENETUNREACH); 1571 } 1572 sendhook = pppoe_finduniq(node, utag); 1573 if (sendhook == NULL) 1574 LEAVE(ENETUNREACH); 1575 1576 /* 1577 * Check the session is in the right state. 1578 * It needs to be in PPPOE_SREQ. 1579 */ 1580 sp = NG_HOOK_PRIVATE(sendhook); 1581 if (sp->state != PPPOE_SREQ) 1582 LEAVE(ENETUNREACH); 1583 neg = sp->neg; 1584 ng_uncallout(&neg->handle, node); 1585 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1586 sp->Session_ID = ntohs(wh->ph.sid); 1587 pppoe_addsession(sp); 1588 send_sessionid(sp); 1589 neg->timeout = 0; 1590 sp->state = PPPOE_CONNECTED; 1591 /* 1592 * Now we have gone to Connected mode, 1593 * Free all resources needed for negotiation. 1594 * Keep a copy of the header we will be using. 1595 */ 1596 sp->pkt_hdr = neg->pkt->pkt_header; 1597 if (privp->flags & COMPAT_3COM) 1598 sp->pkt_hdr.eh.ether_type 1599 = ETHERTYPE_PPPOE_3COM_SESS; 1600 else 1601 sp->pkt_hdr.eh.ether_type 1602 = ETHERTYPE_PPPOE_SESS; 1603 sp->pkt_hdr.ph.code = 0; 1604 m_freem(neg->m); 1605 free(sp->neg, M_NETGRAPH_PPPOE); 1606 sp->neg = NULL; 1607 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1608 break; 1609 case PADT_CODE: 1610 /* 1611 * Find matching peer/session combination. 1612 */ 1613 sp = pppoe_findsession(privp, wh); 1614 if (sp == NULL) 1615 LEAVE(ENETUNREACH); 1616 /* Disconnect that hook. */ 1617 ng_rmhook_self(sp->hook); 1618 break; 1619 default: 1620 LEAVE(EPFNOSUPPORT); 1621 } 1622 break; 1623 case ETHERTYPE_PPPOE_3COM_SESS: 1624 case ETHERTYPE_PPPOE_SESS: 1625 /* 1626 * Find matching peer/session combination. 1627 */ 1628 sp = pppoe_findsession(privp, wh); 1629 if (sp == NULL) 1630 LEAVE (ENETUNREACH); 1631 m_adj(m, sizeof(*wh)); 1632 1633 /* If packet too short, dump it. */ 1634 if (m->m_pkthdr.len < length) 1635 LEAVE(EMSGSIZE); 1636 /* Also need to trim excess at the end */ 1637 if (m->m_pkthdr.len > length) { 1638 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1639 } 1640 if ( sp->state != PPPOE_CONNECTED) { 1641 if (sp->state == PPPOE_NEWCONNECTED) { 1642 sp->state = PPPOE_CONNECTED; 1643 /* 1644 * Now we have gone to Connected mode, 1645 * Free all resources needed for negotiation. 1646 * Be paranoid about whether there may be 1647 * a timeout. 1648 */ 1649 m_freem(sp->neg->m); 1650 ng_uncallout(&sp->neg->handle, node); 1651 free(sp->neg, M_NETGRAPH_PPPOE); 1652 sp->neg = NULL; 1653 } else { 1654 LEAVE (ENETUNREACH); 1655 } 1656 } 1657 NG_FWD_NEW_DATA(error, item, sp->hook, m); 1658 break; 1659 default: 1660 LEAVE(EPFNOSUPPORT); 1661 } 1662quit: 1663 if (item) 1664 NG_FREE_ITEM(item); 1665 NG_FREE_M(m); 1666 return (error); 1667} 1668 1669/* 1670 * Receive data from debug hook and bypass it to ether. 1671 */ 1672static int 1673ng_pppoe_rcvdata_debug(hook_p hook, item_p item) 1674{ 1675 node_p node = NG_HOOK_NODE(hook); 1676 const priv_p privp = NG_NODE_PRIVATE(node); 1677 int error; 1678 1679 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1680 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1681 1682 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); 1683 privp->packets_out++; 1684 return (error); 1685} 1686 1687/* 1688 * Do local shutdown processing.. 1689 * If we are a persistant device, we might refuse to go away, and 1690 * we'd only remove our links and reset ourself. 1691 */ 1692static int 1693ng_pppoe_shutdown(node_p node) 1694{ 1695 const priv_p privp = NG_NODE_PRIVATE(node); 1696 int i; 1697 1698 for (i = 0; i < SESSHASHSIZE; i++) 1699 mtx_destroy(&privp->sesshash[i].mtx); 1700 NG_NODE_SET_PRIVATE(node, NULL); 1701 NG_NODE_UNREF(privp->node); 1702 free(privp, M_NETGRAPH_PPPOE); 1703 return (0); 1704} 1705 1706/* 1707 * Hook disconnection 1708 * 1709 * Clean up all dangling links and information about the session/hook. 1710 * For this type, removal of the last link destroys the node. 1711 */ 1712static int 1713ng_pppoe_disconnect(hook_p hook) 1714{ 1715 node_p node = NG_HOOK_NODE(hook); 1716 priv_p privp = NG_NODE_PRIVATE(node); 1717 sessp sp; 1718 1719 if (hook == privp->debug_hook) { 1720 privp->debug_hook = NULL; 1721 } else if (hook == privp->ethernet_hook) { 1722 privp->ethernet_hook = NULL; 1723 if (NG_NODE_IS_VALID(node)) 1724 ng_rmnode_self(node); 1725 } else { 1726 sp = NG_HOOK_PRIVATE(hook); 1727 if (sp->state != PPPOE_SNONE ) { 1728 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1729 } 1730 /* 1731 * According to the spec, if we are connected, 1732 * we should send a DISC packet if we are shutting down 1733 * a session. 1734 */ 1735 if ((privp->ethernet_hook) 1736 && ((sp->state == PPPOE_CONNECTED) 1737 || (sp->state == PPPOE_NEWCONNECTED))) { 1738 struct mbuf *m; 1739 1740 /* Generate a packet of that type. */ 1741 MGETHDR(m, M_DONTWAIT, MT_DATA); 1742 if (m == NULL) 1743 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1744 "mbufs\n", node->nd_ID); 1745 else { 1746 struct pppoe_full_hdr *wh; 1747 struct pppoe_tag *tag; 1748 int msglen = strlen(SIGNOFF); 1749 int error = 0; 1750 1751 m->m_pkthdr.rcvif = NULL; 1752 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1753 wh = mtod(m, struct pppoe_full_hdr *); 1754 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1755 1756 /* Revert the stored header to DISC/PADT mode. */ 1757 wh->ph.code = PADT_CODE; 1758 /* 1759 * Configure ethertype depending on what 1760 * was used during sessions stage. 1761 */ 1762 if (wh->eh.ether_type == 1763 ETHERTYPE_PPPOE_3COM_SESS) 1764 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1765 else 1766 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1767 /* 1768 * Add a General error message and adjust 1769 * sizes. 1770 */ 1771 tag = (void *)(&wh->ph + 1); 1772 tag->tag_type = PTT_GEN_ERR; 1773 tag->tag_len = htons((u_int16_t)msglen); 1774 strncpy((char *)(tag + 1), SIGNOFF, msglen); 1775 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1776 msglen); 1777 wh->ph.length = htons(sizeof(*tag) + msglen); 1778 NG_SEND_DATA_ONLY(error, 1779 privp->ethernet_hook, m); 1780 } 1781 } 1782 if (sp->state == PPPOE_LISTENING) 1783 LIST_REMOVE(sp, sessions); 1784 else if (sp->Session_ID) 1785 pppoe_delsession(sp); 1786 /* 1787 * As long as we have somewhere to store the timeout handle, 1788 * we may have a timeout pending.. get rid of it. 1789 */ 1790 if (sp->neg) { 1791 ng_uncallout(&sp->neg->handle, node); 1792 if (sp->neg->m) 1793 m_freem(sp->neg->m); 1794 free(sp->neg, M_NETGRAPH_PPPOE); 1795 } 1796 free(sp, M_NETGRAPH_PPPOE); 1797 NG_HOOK_SET_PRIVATE(hook, NULL); 1798 } 1799 if ((NG_NODE_NUMHOOKS(node) == 0) && 1800 (NG_NODE_IS_VALID(node))) 1801 ng_rmnode_self(node); 1802 return (0); 1803} 1804 1805/* 1806 * Timeouts come here. 1807 */ 1808static void 1809pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 1810{ 1811 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1812 sessp sp = NG_HOOK_PRIVATE(hook); 1813 negp neg = sp->neg; 1814 struct mbuf *m0 = NULL; 1815 int error = 0; 1816 1817 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", 1818 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); 1819 switch(sp->state) { 1820 /* 1821 * Resend the last packet, using an exponential backoff. 1822 * After a period of time, stop growing the backoff, 1823 * And either leave it, or revert to the start. 1824 */ 1825 case PPPOE_SINIT: 1826 case PPPOE_SREQ: 1827 /* Timeouts on these produce resends. */ 1828 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1829 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 1830 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 1831 pppoe_ticker, NULL, 0); 1832 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1833 if (sp->state == PPPOE_SREQ) { 1834 /* Revert to SINIT mode. */ 1835 pppoe_start(sp); 1836 } else { 1837 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1838 } 1839 } 1840 break; 1841 case PPPOE_PRIMED: 1842 case PPPOE_SOFFER: 1843 /* A timeout on these says "give up" */ 1844 ng_rmhook_self(hook); 1845 break; 1846 default: 1847 /* Timeouts have no meaning in other states. */ 1848 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", 1849 node->nd_ID); 1850 } 1851} 1852 1853/* 1854 * Parse an incoming packet to see if any tags should be copied to the 1855 * output packet. Don't do any tags that have been handled in the main 1856 * state machine. 1857 */ 1858static const struct pppoe_tag* 1859scan_tags(sessp sp, const struct pppoe_hdr* ph) 1860{ 1861 const char *const end = (const char *)next_tag(ph); 1862 const char *ptn; 1863 const struct pppoe_tag *pt = (const void *)(ph + 1); 1864 1865 /* 1866 * Keep processing tags while a tag header will still fit. 1867 */ 1868 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1869 1870 while((const char*)(pt + 1) <= end) { 1871 /* 1872 * If the tag data would go past the end of the packet, abort. 1873 */ 1874 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 1875 if(ptn > end) 1876 return NULL; 1877 1878 switch (pt->tag_type) { 1879 case PTT_RELAY_SID: 1880 insert_tag(sp, pt); 1881 break; 1882 case PTT_EOL: 1883 return NULL; 1884 case PTT_SRV_NAME: 1885 case PTT_AC_NAME: 1886 case PTT_HOST_UNIQ: 1887 case PTT_AC_COOKIE: 1888 case PTT_VENDOR: 1889 case PTT_SRV_ERR: 1890 case PTT_SYS_ERR: 1891 case PTT_GEN_ERR: 1892 break; 1893 } 1894 pt = (const struct pppoe_tag*)ptn; 1895 } 1896 return NULL; 1897} 1898 1899static int 1900pppoe_send_event(sessp sp, enum cmd cmdid) 1901{ 1902 int error; 1903 struct ng_mesg *msg; 1904 struct ngpppoe_sts *sts; 1905 1906 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1907 1908 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1909 sizeof(struct ngpppoe_sts), M_NOWAIT); 1910 if (msg == NULL) 1911 return (ENOMEM); 1912 sts = (struct ngpppoe_sts *)msg->data; 1913 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1914 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1915 return (error); 1916} 1917