sys/netgraph/ng_pppoe.c

   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 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 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
  68
  69 /*
  70  * This section contains the netgraph method declarations for the
  71  * pppoe node. These methods define the netgraph pppoe 'type'.
  72  */
  73
  74 static ng_constructor_t ng_pppoe_constructor;
  75 static ng_rcvmsg_t      ng_pppoe_rcvmsg;
  76 static ng_shutdown_t    ng_pppoe_shutdown;
  77 static ng_newhook_t     ng_pppoe_newhook;
  78 static ng_connect_t     ng_pppoe_connect;
  79 static ng_rcvdata_t     ng_pppoe_rcvdata;
  80 static ng_rcvdata_t     ng_pppoe_rcvdata_ether;
  81 static ng_rcvdata_t     ng_pppoe_rcvdata_debug;
  82 static ng_disconnect_t  ng_pppoe_disconnect;
  83
  84 /* Parse type for struct ngpppoe_init_data */
  85 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
  86         = NG_PPPOE_INIT_DATA_TYPE_INFO;
  87 static const struct ng_parse_type ngpppoe_init_data_state_type = {
  88         &ng_parse_struct_type,
  89         &ngpppoe_init_data_type_fields
  90 };
  91
  92 /* Parse type for struct ngpppoe_sts */
  93 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
  94         = NG_PPPOE_STS_TYPE_INFO;
  95 static const struct ng_parse_type ng_pppoe_sts_state_type = {
  96         &ng_parse_struct_type,
  97         &ng_pppoe_sts_type_fields
  98 };
  99
 100 /* List of commands and how to convert arguments to/from ASCII */
 101 static const struct ng_cmdlist ng_pppoe_cmds[] = {
 102         {
 103           NGM_PPPOE_COOKIE,
 104           NGM_PPPOE_CONNECT,
 105           "pppoe_connect",
 106           &ngpppoe_init_data_state_type,
 107           NULL
 108         },
 109         {
 110           NGM_PPPOE_COOKIE,
 111           NGM_PPPOE_LISTEN,
 112           "pppoe_listen",
 113           &ngpppoe_init_data_state_type,
 114           NULL
 115         },
 116         {
 117           NGM_PPPOE_COOKIE,
 118           NGM_PPPOE_OFFER,
 119           "pppoe_offer",
 120           &ngpppoe_init_data_state_type,
 121           NULL
 122         },
 123         {
 124           NGM_PPPOE_COOKIE,
 125           NGM_PPPOE_SERVICE,
 126           "pppoe_service",
 127           &ngpppoe_init_data_state_type,
 128           NULL
 129         },
 130         {
 131           NGM_PPPOE_COOKIE,
 132           NGM_PPPOE_SUCCESS,
 133           "pppoe_success",
 134           &ng_pppoe_sts_state_type,
 135           NULL
 136         },
 137         {
 138           NGM_PPPOE_COOKIE,
 139           NGM_PPPOE_FAIL,
 140           "pppoe_fail",
 141           &ng_pppoe_sts_state_type,
 142           NULL
 143         },
 144         {
 145           NGM_PPPOE_COOKIE,
 146           NGM_PPPOE_CLOSE,
 147           "pppoe_close",
 148           &ng_pppoe_sts_state_type,
 149           NULL
 150         },
 151         {
 152           NGM_PPPOE_COOKIE,
 153           NGM_PPPOE_SETMODE,
 154           "pppoe_setmode",
 155           &ng_parse_string_type,
 156           NULL
 157         },
 158         {
 159           NGM_PPPOE_COOKIE,
 160           NGM_PPPOE_GETMODE,
 161           "pppoe_getmode",
 162           NULL,
 163           &ng_parse_string_type
 164         },
 165         {
 166           NGM_PPPOE_COOKIE,
 167           NGM_PPPOE_SETENADDR,
 168           "setenaddr",
 169           &ng_parse_enaddr_type,
 170           NULL
 171         },
 172         { 0 }
 173 };
 174
 175 /* Netgraph node type descriptor */
 176 static struct ng_type typestruct = {
 177         .version =      NG_ABI_VERSION,
 178         .name =         NG_PPPOE_NODE_TYPE,
 179         .constructor =  ng_pppoe_constructor,
 180         .rcvmsg =       ng_pppoe_rcvmsg,
 181         .shutdown =     ng_pppoe_shutdown,
 182         .newhook =      ng_pppoe_newhook,
 183         .connect =      ng_pppoe_connect,
 184         .rcvdata =      ng_pppoe_rcvdata,
 185         .disconnect =   ng_pppoe_disconnect,
 186         .cmdlist =      ng_pppoe_cmds,
 187 };
 188 NETGRAPH_INIT(pppoe, &typestruct);
 189
 190 /*
 191  * States for the session state machine.
 192  * These have no meaning if there is no hook attached yet.
 193  */
 194 enum state {
 195     PPPOE_SNONE=0,      /* [both] Initial state */
 196     PPPOE_LISTENING,    /* [Daemon] Listening for discover initiation pkt */
 197     PPPOE_SINIT,        /* [Client] Sent discovery initiation */
 198     PPPOE_PRIMED,       /* [Server] Awaiting PADI from daemon */
 199     PPPOE_SOFFER,       /* [Server] Sent offer message  (got PADI)*/
 200     PPPOE_SREQ,         /* [Client] Sent a Request */
 201     PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
 202     PPPOE_CONNECTED,    /* [Both] Connection established, Data received */
 203     PPPOE_DEAD          /* [Both] */
 204 };
 205
 206 #define NUMTAGS 20 /* number of tags we are set up to work with */
 207
 208 /*
 209  * Information we store for each hook on each node for negotiating the
 210  * session. The mbuf and cluster are freed once negotiation has completed.
 211  * The whole negotiation block is then discarded.
 212  */
 213
 214 struct sess_neg {
 215         struct mbuf             *m; /* holds cluster with last sent packet */
 216         union   packet          *pkt; /* points within the above cluster */
 217         struct callout          handle;   /* see timeout(9) */
 218         u_int                   timeout; /* 0,1,2,4,8,16 etc. seconds */
 219         u_int                   numtags;
 220         const struct pppoe_tag  *tags[NUMTAGS];
 221         u_int                   service_len;
 222         u_int                   ac_name_len;
 223
 224         struct datatag          service;
 225         struct datatag          ac_name;
 226 };
 227 typedef struct sess_neg *negp;
 228
 229 /*
 230  * Session information that is needed after connection.
 231  */
 232 struct sess_con {
 233         hook_p                  hook;
 234         uint16_t                Session_ID;
 235         enum state              state;
 236         ng_ID_t                 creator;        /* who to notify */
 237         struct pppoe_full_hdr   pkt_hdr;        /* used when connected */
 238         negp                    neg;            /* used when negotiating */
 239 };
 240 typedef struct sess_con *sessp;
 241
 242 /*
 243  * Information we store for each node
 244  */
 245 struct PPPoE {
 246         node_p          node;           /* back pointer to node */
 247         hook_p          ethernet_hook;
 248         hook_p          debug_hook;
 249         u_int           packets_in;     /* packets in from ethernet */
 250         u_int           packets_out;    /* packets out towards ethernet */
 251         uint32_t        flags;
 252 #define COMPAT_3COM     0x00000001
 253 #define COMPAT_DLINK    0x00000002
 254         struct ether_header     eh;
 255 };
 256 typedef struct PPPoE *priv_p;
 257
 258 union uniq {
 259         char bytes[sizeof(void *)];
 260         void *pointer;
 261 };
 262
 263 #define LEAVE(x) do { error = x; goto quit; } while(0)
 264 static void     pppoe_start(sessp sp);
 265 static void     pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
 266 static const    struct pppoe_tag *scan_tags(sessp sp,
 267                         const struct pppoe_hdr* ph);
 268 static  int     pppoe_send_event(sessp sp, enum cmd cmdid);
 269
 270 /*************************************************************************
 271  * Some basic utilities  from the Linux version with author's permission.*
 272  * Author:      Michal Ostrowski <mostrows@styx.uwaterloo.ca>            *
 273  ************************************************************************/
 274
 275 /*
 276  * Generate a new session id
 277  * XXX find out the FreeBSD locking scheme.
 278  */
 279 static uint16_t
 280 get_new_sid(node_p node)
 281 {
 282         static int pppoe_sid = 10;
 283         hook_p  hook;
 284         uint16_t val;
 285
 286 restart:
 287         val = pppoe_sid++;
 288         /*
 289          * Spec says 0xFFFF is reserved.
 290          * Also don't use 0x0000
 291          */
 292         if (val == 0xffff) {
 293                 pppoe_sid = 20;
 294                 goto restart;
 295         }
 296
 297         /* Check it isn't already in use. */
 298         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 299                 sessp sp = NG_HOOK_PRIVATE(hook);
 300
 301                 /* Skip any nonsession hook. */
 302                 if (sp == NULL)
 303                         continue;
 304                 if (sp->Session_ID == val)
 305                         goto restart;
 306         }
 307
 308         CTR2(KTR_NET, "%20s: new sid %d", __func__, val);
 309
 310         return (val);
 311 }
 312
 313
 314 /*
 315  * Return the location where the next tag can be put
 316  */
 317 static __inline const struct pppoe_tag*
 318 next_tag(const struct pppoe_hdr* ph)
 319 {
 320         return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
 321             + ntohs(ph->length));
 322 }
 323
 324 /*
 325  * Look for a tag of a specific type.
 326  * Don't trust any length the other end says,
 327  * but assume we already sanity checked ph->length.
 328  */
 329 static const struct pppoe_tag*
 330 get_tag(const struct pppoe_hdr* ph, uint16_t idx)
 331 {
 332         const char *const end = (const char *)next_tag(ph);
 333         const struct pppoe_tag *pt = &ph->tag[0];
 334         const char *ptn;
 335
 336         /*
 337          * Keep processing tags while a tag header will still fit.
 338          */
 339         while((const char*)(pt + 1) <= end) {
 340                 /*
 341                  * If the tag data would go past the end of the packet, abort.
 342                  */
 343                 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
 344                 if (ptn > end) {
 345                         CTR2(KTR_NET, "%20s: invalid length for tag %d",
 346                             __func__, idx);
 347                         return (NULL);
 348                 }
 349                 if (pt->tag_type == idx) {
 350                         CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
 351                         return (pt);
 352                 }
 353
 354                 pt = (const struct pppoe_tag*)ptn;
 355         }
 356
 357         CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
 358         return (NULL);
 359 }
 360
 361 /**************************************************************************
 362  * Inlines to initialise or add tags to a session's tag list.
 363  **************************************************************************/
 364 /*
 365  * Initialise the session's tag list.
 366  */
 367 static void
 368 init_tags(sessp sp)
 369 {
 370         KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
 371         sp->neg->numtags = 0;
 372 }
 373
 374 static void
 375 insert_tag(sessp sp, const struct pppoe_tag *tp)
 376 {
 377         negp neg = sp->neg;
 378         int i;
 379
 380         KASSERT(neg != NULL, ("%s: no neg", __func__));
 381         if ((i = neg->numtags++) < NUMTAGS) {
 382                 neg->tags[i] = tp;
 383         } else {
 384                 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
 385                     "packet\n");
 386                 neg->numtags--;
 387         }
 388 }
 389
 390 /*
 391  * Make up a packet, using the tags filled out for the session.
 392  *
 393  * Assume that the actual pppoe header and ethernet header
 394  * are filled out externally to this routine.
 395  * Also assume that neg->wh points to the correct
 396  * location at the front of the buffer space.
 397  */
 398 static void
 399 make_packet(sessp sp) {
 400         struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
 401         const struct pppoe_tag **tag;
 402         char *dp;
 403         int count;
 404         int tlen;
 405         uint16_t length = 0;
 406
 407         KASSERT((sp->neg != NULL) && (sp->neg->m != NULL),
 408             ("%s: called from wrong state", __func__));
 409         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
 410
 411         dp = (char *)wh->ph.tag;
 412         for (count = 0, tag = sp->neg->tags;
 413             ((count < sp->neg->numtags) && (count < NUMTAGS));
 414             tag++, count++) {
 415                 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
 416                 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
 417                         log(LOG_NOTICE, "ng_pppoe: tags too long\n");
 418                         sp->neg->numtags = count;
 419                         break;  /* XXX chop off what's too long */
 420                 }
 421                 bcopy(*tag, (char *)dp, tlen);
 422                 length += tlen;
 423                 dp += tlen;
 424         }
 425         wh->ph.length = htons(length);
 426         sp->neg->m->m_len = length + sizeof(*wh);
 427         sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
 428 }
 429
 430 /**************************************************************************
 431  * Routines to match a service.                                           *
 432  **************************************************************************/
 433
 434 /*
 435  * Find a hook that has a service string that matches that
 436  * we are seeking. For now use a simple string.
 437  * In the future we may need something like regexp().
 438  *
 439  * Null string is a wildcard (ANY service), according to RFC2516.
 440  * And historical FreeBSD wildcard is also "*".
 441  */
 442
 443 static hook_p
 444 pppoe_match_svc(node_p node, const struct pppoe_tag *tag)
 445 {
 446         hook_p hook;
 447
 448         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 449                 sessp sp = NG_HOOK_PRIVATE(hook);
 450                 negp neg;
 451
 452                 /* Skip any nonsession hook. */
 453                 if (sp == NULL)
 454                         continue;
 455
 456                 /* Skip any sessions which are not in LISTEN mode. */
 457                 if (sp->state != PPPOE_LISTENING)
 458                         continue;
 459
 460                 neg = sp->neg;
 461
 462                 /* Empty Service-Name matches any service. */
 463                 if (neg->service_len == 0)
 464                         break;
 465
 466                 /* Special case for a blank or "*" service name (wildcard). */
 467                 if (neg->service_len == 1 && neg->service.data[0] == '*')
 468                         break;
 469
 470                 /* If the lengths don't match, that aint it. */
 471                 if (neg->service_len != ntohs(tag->tag_len))
 472                         continue;
 473
 474                 if (strncmp(tag->tag_data, neg->service.data,
 475                     ntohs(tag->tag_len)) == 0)
 476                         break;
 477         }
 478         CTR3(KTR_NET, "%20s: matched %p for %s", __func__, hook, tag->tag_data);
 479
 480         return (hook);
 481 }
 482
 483 /*
 484  * Broadcast the PADI packet in m0 to all listening hooks.
 485  * This routine is called when a PADI with empty Service-Name
 486  * tag is received. Client should receive PADOs with all
 487  * available services.
 488  */
 489 static int
 490 pppoe_broadcast_padi(node_p node, struct mbuf *m0)
 491 {
 492         hook_p hook;
 493         int error = 0;
 494
 495         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 496                 sessp sp = NG_HOOK_PRIVATE(hook);
 497                 struct mbuf *m;
 498
 499                 /*
 500                  * Go through all listening hooks and
 501                  * broadcast the PADI packet up there
 502                  */
 503                 if (sp == NULL)
 504                         continue;
 505
 506                 if (sp->state != PPPOE_LISTENING)
 507                         continue;
 508
 509                 m = m_dup(m0, M_DONTWAIT);
 510                 if (m == NULL)
 511                         return (ENOMEM);
 512                 NG_SEND_DATA_ONLY(error, hook, m);
 513                 if (error)
 514                         return (error);
 515         }
 516
 517         return (0);
 518 }
 519
 520 /*
 521  * Find a hook, which name equals to given service.
 522  */
 523 static hook_p
 524 pppoe_find_svc(node_p node, const char *svc_name, int svc_len)
 525 {
 526         hook_p  hook;
 527
 528         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 529                 sessp sp = NG_HOOK_PRIVATE(hook);
 530                 negp neg;
 531
 532                 /* Skip any nonsession hook. */
 533                 if (sp == NULL)
 534                         continue;
 535
 536                 /* Skip any sessions which are not in LISTEN mode. */
 537                 if (sp->state != PPPOE_LISTENING)
 538                         continue;
 539
 540                 neg = sp->neg;
 541
 542                 if (neg->service_len == svc_len &&
 543                     strncmp(svc_name, neg->service.data, svc_len) == 0)
 544                         return (hook);
 545         }
 546
 547         return (NULL);
 548 }
 549
 550 /**************************************************************************
 551  * Routine to find a particular session that matches an incoming packet.  *
 552  **************************************************************************/
 553 static hook_p
 554 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
 555 {
 556         hook_p  hook = NULL;
 557         uint16_t session = ntohs(wh->ph.sid);
 558
 559         /*
 560          * Find matching peer/session combination.
 561          */
 562         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 563                 sessp   sp = NG_HOOK_PRIVATE(hook);
 564
 565                 /* Skip any nonsession hook. */
 566                 if (sp == NULL)
 567                         continue;
 568                 if (sp->Session_ID == session &&
 569                     (sp->state == PPPOE_CONNECTED ||
 570                      sp->state == PPPOE_NEWCONNECTED) &&
 571                     bcmp(sp->pkt_hdr.eh.ether_dhost,
 572                      wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) {
 573                         break;
 574                 }
 575         }
 576         CTR3(KTR_NET, "%20s: matched %p for %d", __func__, hook, session);
 577
 578         return (hook);
 579 }
 580
 581 static hook_p
 582 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
 583 {
 584         hook_p  hook = NULL;
 585         union uniq uniq;
 586
 587         bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
 588         /* Cycle through all known hooks. */
 589         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 590                 /* Skip any nonsession hook. */
 591                 if (NG_HOOK_PRIVATE(hook) == NULL)
 592                         continue;
 593                 if (uniq.pointer == NG_HOOK_PRIVATE(hook))
 594                         break;
 595         }
 596         CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.pointer);
 597
 598         return (hook);
 599 }
 600
 601 /**************************************************************************
 602  * Start of Netgraph entrypoints.                                         *
 603  **************************************************************************/
 604
 605 /*
 606  * Allocate the private data structure and link it with node.
 607  */
 608 static int
 609 ng_pppoe_constructor(node_p node)
 610 {
 611         priv_p privp;
 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         CTR3(KTR_NET, "%20s: created node [%x] (%p)",
 627             __func__, node->nd_ID, node);
 628
 629         return (0);
 630 }
 631
 632 /*
 633  * Give our ok for a hook to be added...
 634  * point the hook's private info to the hook structure.
 635  *
 636  * The following hook names are special:
 637  *  "ethernet":  the hook that should be connected to a NIC.
 638  *  "debug":    copies of data sent out here  (when I write the code).
 639  * All other hook names need only be unique. (the framework checks this).
 640  */
 641 static int
 642 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
 643 {
 644         const priv_p privp = NG_NODE_PRIVATE(node);
 645         sessp sp;
 646
 647         if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
 648                 privp->ethernet_hook = hook;
 649                 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether);
 650         } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
 651                 privp->debug_hook = hook;
 652                 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug);
 653         } else {
 654                 /*
 655                  * Any other unique name is OK.
 656                  * The infrastructure has already checked that it's unique,
 657                  * so just allocate it and hook it in.
 658                  */
 659                 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
 660                 if (sp == NULL)
 661                         return (ENOMEM);
 662
 663                 NG_HOOK_SET_PRIVATE(hook, sp);
 664                 sp->hook = hook;
 665         }
 666         CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)",
 667             __func__, node->nd_ID, node, name, hook);
 668
 669         return(0);
 670 }
 671
 672 /*
 673  * Hook has been added successfully. Request the MAC address of
 674  * the underlying Ethernet node.
 675  */
 676 static int
 677 ng_pppoe_connect(hook_p hook)
 678 {
 679         const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 680         struct ng_mesg *msg;
 681         int error;
 682
 683         if (hook != privp->ethernet_hook)
 684                 return (0);
 685
 686         /*
 687          * If this is Ethernet hook, then request MAC address
 688          * from our downstream.
 689          */
 690         NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT);
 691         if (msg == NULL)
 692                 return (ENOBUFS);
 693
 694         /*
 695          * Our hook and peer hook have HK_INVALID flag set,
 696          * so we can't use NG_SEND_MSG_HOOK() macro here.
 697          */
 698         NG_SEND_MSG_ID(error, privp->node, msg,
 699             NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)),
 700             NG_NODE_ID(privp->node));
 701
 702         return (error);
 703 }
 704 /*
 705  * Get a netgraph control message.
 706  * Check it is one we understand. If needed, send a response.
 707  * We sometimes save the address for an async action later.
 708  * Always free the message.
 709  */
 710 static int
 711 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
 712 {
 713         priv_p privp = NG_NODE_PRIVATE(node);
 714         struct ngpppoe_init_data *ourmsg = NULL;
 715         struct ng_mesg *resp = NULL;
 716         int error = 0;
 717         hook_p hook = NULL;
 718         sessp sp = NULL;
 719         negp neg = NULL;
 720         struct ng_mesg *msg;
 721
 722         NGI_GET_MSG(item, msg);
 723         CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
 724             __func__, node->nd_ID, node, msg->header.cmd,
 725             msg->header.typecookie);
 726
 727         /* Deal with message according to cookie and command. */
 728         switch (msg->header.typecookie) {
 729         case NGM_PPPOE_COOKIE:
 730                 switch (msg->header.cmd) {
 731                 case NGM_PPPOE_CONNECT:
 732                 case NGM_PPPOE_LISTEN:
 733                 case NGM_PPPOE_OFFER:
 734                 case NGM_PPPOE_SERVICE:
 735                         ourmsg = (struct ngpppoe_init_data *)msg->data;
 736                         if (msg->header.arglen < sizeof(*ourmsg)) {
 737                                 log(LOG_ERR, "ng_pppoe[%x]: init data too "
 738                                     "small\n", node->nd_ID);
 739                                 LEAVE(EMSGSIZE);
 740                         }
 741                         if (msg->header.arglen - sizeof(*ourmsg) >
 742                             PPPOE_SERVICE_NAME_SIZE) {
 743                                 log(LOG_ERR, "ng_pppoe[%x]: service name "
 744                                     "too big\n", node->nd_ID);
 745                                 LEAVE(EMSGSIZE);
 746                         }
 747                         if (msg->header.arglen - sizeof(*ourmsg) <
 748                             ourmsg->data_len) {
 749                                 log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
 750                                     "length, %d should be %zd\n", node->nd_ID,
 751                                     ourmsg->data_len,
 752                                     msg->header.arglen - sizeof (*ourmsg));
 753                                 LEAVE(EMSGSIZE);
 754                         }
 755
 756                         /* Make sure strcmp will terminate safely. */
 757                         ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
 758
 759                         /* Cycle through all known hooks. */
 760                         LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
 761                                 if (NG_HOOK_NAME(hook) &&
 762                                     strcmp(NG_HOOK_NAME(hook), ourmsg->hook) ==
 763                                     0)
 764                                         break;
 765                         }
 766                         if (hook == NULL)
 767                                 LEAVE(ENOENT);
 768
 769                         sp = NG_HOOK_PRIVATE(hook);
 770
 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                         break;
 893                 case NGM_PPPOE_OFFER:
 894                         /*
 895                          * Check the hook exists and is Uninitialised.
 896                          * Store the originator of this message so we can send
 897                          * a success of fail message to them later.
 898                          * Store the AC-Name given and go to PRIMED.
 899                          */
 900                         neg->ac_name.hdr.tag_type = PTT_AC_NAME;
 901                         neg->ac_name.hdr.tag_len =
 902                             htons((uint16_t)ourmsg->data_len);
 903                         if (ourmsg->data_len)
 904                                 bcopy(ourmsg->data, neg->ac_name.data,
 905                                     ourmsg->data_len);
 906                         neg->ac_name_len = ourmsg->data_len;
 907                         neg->pkt->pkt_header.ph.code = PADO_CODE;
 908                         /*
 909                          * Wait for PADI packet coming from hook.
 910                          */
 911                         sp->state = PPPOE_PRIMED;
 912                         break;
 913                 case NGM_PPPOE_SERVICE:
 914                         /*
 915                          * Check the session is primed.
 916                          * for now just allow ONE service to be advertised.
 917                          * If you do it twice you just overwrite.
 918                          */
 919                         if (sp->state != PPPOE_PRIMED) {
 920                                 log(LOG_NOTICE, "ng_pppoe[%x]: session not "
 921                                     "primed\n", node->nd_ID);
 922                                 LEAVE(EISCONN);
 923                         }
 924                         neg = sp->neg;
 925                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 926                         neg->service.hdr.tag_len =
 927                             htons((uint16_t)ourmsg->data_len);
 928
 929                         if (ourmsg->data_len)
 930                                 bcopy(ourmsg->data, neg->service.data,
 931                                     ourmsg->data_len);
 932                         neg->service_len = ourmsg->data_len;
 933                         break;
 934                 case NGM_PPPOE_SETMODE:
 935                     {
 936                         char *s;
 937                         size_t len;
 938
 939                         if (msg->header.arglen == 0)
 940                                 LEAVE(EINVAL);
 941
 942                         s = (char *)msg->data;
 943                         len = msg->header.arglen - 1;
 944
 945                         /* Search for matching mode string. */
 946                         if (len == strlen(NG_PPPOE_STANDARD) &&
 947                             (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) {
 948                                 privp->flags = 0;
 949                                 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
 950                                 break;
 951                         }
 952                         if (len == strlen(NG_PPPOE_3COM) &&
 953                             (strncmp(NG_PPPOE_3COM, s, len) == 0)) {
 954                                 privp->flags |= COMPAT_3COM;
 955                                 privp->eh.ether_type =
 956                                     ETHERTYPE_PPPOE_3COM_DISC;
 957                                 break;
 958                         }
 959                         if (len == strlen(NG_PPPOE_DLINK) &&
 960                             (strncmp(NG_PPPOE_DLINK, s, len) == 0)) {
 961                                 privp->flags |= COMPAT_DLINK;
 962                                 break;
 963                         }
 964                         error = EINVAL;
 965                         break;
 966                     }
 967                 case NGM_PPPOE_GETMODE:
 968                     {
 969                         char *s;
 970                         size_t len = 0;
 971
 972                         if (privp->flags == 0)
 973                                 len += strlen(NG_PPPOE_STANDARD) + 1;
 974                         if (privp->flags & COMPAT_3COM)
 975                                 len += strlen(NG_PPPOE_3COM) + 1;
 976                         if (privp->flags & COMPAT_DLINK)
 977                                 len += strlen(NG_PPPOE_DLINK) + 1;
 978
 979                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
 980                         if (resp == NULL)
 981                                 LEAVE(ENOMEM);
 982
 983                         s = (char *)resp->data;
 984                         if (privp->flags == 0) {
 985                                 len = strlen(NG_PPPOE_STANDARD);
 986                                 strlcpy(s, NG_PPPOE_STANDARD, len + 1);
 987                                 break;
 988                         }
 989                         if (privp->flags & COMPAT_3COM) {
 990                                 len = strlen(NG_PPPOE_3COM);
 991                                 strlcpy(s, NG_PPPOE_3COM, len + 1);
 992                                 s += len;
 993                         }
 994                         if (privp->flags & COMPAT_DLINK) {
 995                                 if (s != resp->data)
 996                                         *s++ = '|';
 997                                 len = strlen(NG_PPPOE_DLINK);
 998                                 strlcpy(s, NG_PPPOE_DLINK, len + 1);
 999                         }
1000                         break;
1001                     }
1002                 case NGM_PPPOE_SETENADDR:
1003                         if (msg->header.arglen != ETHER_ADDR_LEN)
1004                                 LEAVE(EINVAL);
1005                         bcopy(msg->data, &privp->eh.ether_shost,
1006                             ETHER_ADDR_LEN);
1007                         break;
1008                 default:
1009                         LEAVE(EINVAL);
1010                 }
1011                 break;
1012         case NGM_ETHER_COOKIE:
1013                 if (!(msg->header.flags & NGF_RESP))
1014                         LEAVE(EINVAL);
1015                 switch (msg->header.cmd) {
1016                 case NGM_ETHER_GET_ENADDR:
1017                         if (msg->header.arglen != ETHER_ADDR_LEN)
1018                                 LEAVE(EINVAL);
1019                         bcopy(msg->data, &privp->eh.ether_shost,
1020                             ETHER_ADDR_LEN);
1021                         break;
1022                 default:
1023                         LEAVE(EINVAL);
1024                 }
1025                 break;
1026         default:
1027                 LEAVE(EINVAL);
1028         }
1029
1030         /* Take care of synchronous response, if any. */
1031 quit:
1032         CTR2(KTR_NET, "%20s: returning %d", __func__, error);
1033         NG_RESPOND_MSG(error, node, item, resp);
1034         /* Free the message and return. */
1035         NG_FREE_MSG(msg);
1036         return(error);
1037 }
1038
1039 /*
1040  * Start a client into the first state. A separate function because
1041  * it can be needed if the negotiation times out.
1042  */
1043 static void
1044 pppoe_start(sessp sp)
1045 {
1046         hook_p  hook = sp->hook;
1047         node_p  node = NG_HOOK_NODE(hook);
1048         priv_p  privp = NG_NODE_PRIVATE(node);
1049         negp    neg = sp->neg;
1050         struct {
1051                 struct pppoe_tag hdr;
1052                 union   uniq    data;
1053         } __packed uniqtag;
1054         struct  mbuf *m0;
1055         int     error;
1056
1057         /*
1058          * Kick the state machine into starting up.
1059          */
1060         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1061         sp->state = PPPOE_SINIT;
1062         /*
1063          * Reset the packet header to broadcast. Since we are
1064          * in a client mode use configured ethertype.
1065          */
1066         memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
1067             sizeof(struct ether_header));
1068         neg->pkt->pkt_header.ph.code = PADI_CODE;
1069         uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
1070         uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
1071         uniqtag.data.pointer = sp;
1072         init_tags(sp);
1073         insert_tag(sp, &uniqtag.hdr);
1074         insert_tag(sp, &neg->service.hdr);
1075         make_packet(sp);
1076         /*
1077          * Send packet and prepare to retransmit it after timeout.
1078          */
1079         ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
1080             pppoe_ticker, NULL, 0);
1081         neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1082         m0 = m_copypacket(neg->m, M_DONTWAIT);
1083         NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
1084 }
1085
1086 static int
1087 send_acname(sessp sp, const struct pppoe_tag *tag)
1088 {
1089         int error, tlen;
1090         struct ng_mesg *msg;
1091         struct ngpppoe_sts *sts;
1092
1093         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1094
1095         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
1096             sizeof(struct ngpppoe_sts), M_NOWAIT);
1097         if (msg == NULL)
1098                 return (ENOMEM);
1099
1100         sts = (struct ngpppoe_sts *)msg->data;
1101         tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
1102         strncpy(sts->hook, tag->tag_data, tlen);
1103         sts->hook[tlen] = '\0';
1104         NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1105
1106         return (error);
1107 }
1108
1109 static int
1110 send_sessionid(sessp sp)
1111 {
1112         int error;
1113         struct ng_mesg *msg;
1114
1115         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1116
1117         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
1118             sizeof(uint16_t), M_NOWAIT);
1119         if (msg == NULL)
1120                 return (ENOMEM);
1121
1122         *(uint16_t *)msg->data = sp->Session_ID;
1123         NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1124
1125         return (error);
1126 }
1127
1128 /*
1129  * Receive data from session hook and do something with it.
1130  */
1131 static int
1132 ng_pppoe_rcvdata(hook_p hook, item_p item)
1133 {
1134         node_p                  node = NG_HOOK_NODE(hook);
1135         const priv_p            privp = NG_NODE_PRIVATE(node);
1136         sessp                   sp = NG_HOOK_PRIVATE(hook);
1137         struct pppoe_full_hdr   *wh;
1138         struct mbuf             *m;
1139         int                     error;
1140
1141         CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1142             __func__, node->nd_ID, node, item, hook->hk_name, hook);
1143
1144         NGI_GET_M(item, m);
1145         switch (sp->state) {
1146         case    PPPOE_NEWCONNECTED:
1147         case    PPPOE_CONNECTED: {
1148                 static const u_char addrctrl[] = { 0xff, 0x03 };
1149
1150                 /*
1151                  * Remove PPP address and control fields, if any.
1152                  * For example, ng_ppp(4) always sends LCP packets
1153                  * with address and control fields as required by
1154                  * generic PPP. PPPoE is an exception to the rule.
1155                  */
1156                 if (m->m_pkthdr.len >= 2) {
1157                         if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1158                                 LEAVE(ENOBUFS);
1159                         if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
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         }
1269 quit:
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  */
1279 static int
1280 ng_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, tag->tag_data,
1442                                     neg->ac_name_len) != 0) {
1443                                         break;
1444                                 }
1445                         }
1446                         sp->state = PPPOE_SREQ;
1447                         ng_uncallout(&neg->handle, node);
1448
1449                         /*
1450                          * This is the first time we hear
1451                          * from the server, so note it's
1452                          * unicast address, replacing the
1453                          * broadcast address .
1454                          */
1455                         bcopy(wh->eh.ether_shost,
1456                                 neg->pkt->pkt_header.eh.ether_dhost,
1457                                 ETHER_ADDR_LEN);
1458                         neg->timeout = 0;
1459                         neg->pkt->pkt_header.ph.code = PADR_CODE;
1460                         init_tags(sp);
1461                         insert_tag(sp, utag);           /* Host Unique */
1462                         if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1463                                 insert_tag(sp, tag);    /* return cookie */
1464                         if ((tag = get_tag(ph, PTT_AC_NAME))) {
1465                                 insert_tag(sp, tag);    /* return it */
1466                                 send_acname(sp, tag);
1467                         }
1468                         insert_tag(sp, &neg->service.hdr); /* Service */
1469                         scan_tags(sp, ph);
1470                         make_packet(sp);
1471                         sp->state = PPPOE_SREQ;
1472                         ng_callout(&neg->handle, node, sp->hook,
1473                             PPPOE_INITIAL_TIMEOUT * hz,
1474                             pppoe_ticker, NULL, 0);
1475                         neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1476                         m0 = m_copypacket(neg->m, M_DONTWAIT);
1477                         NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1478                         break;
1479                 case    PADR_CODE:
1480                         /*
1481                          * We are a server:
1482                          * Use the ac_cookie tag to find the
1483                          * hook this is in response to.
1484                          */
1485                         utag = get_tag(ph, PTT_AC_COOKIE);
1486                         if ((utag == NULL) ||
1487                             (ntohs(utag->tag_len) != sizeof(sp))) {
1488                                 LEAVE(ENETUNREACH);
1489                         }
1490
1491                         sendhook = pppoe_finduniq(node, utag);
1492                         if (sendhook == NULL)
1493                                 LEAVE(ENETUNREACH);
1494
1495                         /*
1496                          * Check the session is in the right state.
1497                          * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED.
1498                          * If the latter, then this is a retry by the client,
1499                          * so be nice, and resend.
1500                          */
1501                         sp = NG_HOOK_PRIVATE(sendhook);
1502                         if (sp->state == PPPOE_NEWCONNECTED) {
1503                                 /*
1504                                  * Whoa! drop back to resend that PADS packet.
1505                                  * We should still have a copy of it.
1506                                  */
1507                                 sp->state = PPPOE_SOFFER;
1508                         }
1509                         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(sp->Session_ID
1517                                         = get_new_sid(node));
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                         send_sessionid(sp);
1588                         neg->timeout = 0;
1589                         sp->state = PPPOE_CONNECTED;
1590                         /*
1591                          * Now we have gone to Connected mode,
1592                          * Free all resources needed for negotiation.
1593                          * Keep a copy of the header we will be using.
1594                          */
1595                         sp->pkt_hdr = neg->pkt->pkt_header;
1596                         if (privp->flags & COMPAT_3COM)
1597                                 sp->pkt_hdr.eh.ether_type
1598                                         = ETHERTYPE_PPPOE_3COM_SESS;
1599                         else
1600                                 sp->pkt_hdr.eh.ether_type
1601                                         = ETHERTYPE_PPPOE_SESS;
1602                         sp->pkt_hdr.ph.code = 0;
1603                         m_freem(neg->m);
1604                         free(sp->neg, M_NETGRAPH_PPPOE);
1605                         sp->neg = NULL;
1606                         pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1607                         break;
1608                 case    PADT_CODE:
1609                         /*
1610                          * Find matching peer/session combination.
1611                          */
1612                         sendhook = pppoe_findsession(node, wh);
1613                         if (sendhook == NULL)
1614                                 LEAVE(ENETUNREACH);
1615                         /* Disconnect that hook. */
1616                         ng_rmhook_self(sendhook);
1617                         break;
1618                 default:
1619                         LEAVE(EPFNOSUPPORT);
1620                 }
1621                 break;
1622         case    ETHERTYPE_PPPOE_3COM_SESS:
1623         case    ETHERTYPE_PPPOE_SESS:
1624                 /*
1625                  * Find matching peer/session combination.
1626                  */
1627                 sendhook = pppoe_findsession(node, wh);
1628                 if (sendhook == NULL)
1629                         LEAVE (ENETUNREACH);
1630                 sp = NG_HOOK_PRIVATE(sendhook);
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, sendhook, m);
1658                 break;
1659         default:
1660                 LEAVE(EPFNOSUPPORT);
1661         }
1662 quit:
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  */
1672 static int
1673 ng_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  */
1692 static int
1693 ng_pppoe_shutdown(node_p node)
1694 {
1695         const priv_p privdata = NG_NODE_PRIVATE(node);
1696
1697         NG_NODE_SET_PRIVATE(node, NULL);
1698         NG_NODE_UNREF(privdata->node);
1699         free(privdata, M_NETGRAPH_PPPOE);
1700         return (0);
1701 }
1702
1703 /*
1704  * Hook disconnection
1705  *
1706  * Clean up all dangling links and information about the session/hook.
1707  * For this type, removal of the last link destroys the node.
1708  */
1709 static int
1710 ng_pppoe_disconnect(hook_p hook)
1711 {
1712         node_p node = NG_HOOK_NODE(hook);
1713         priv_p privp = NG_NODE_PRIVATE(node);
1714         sessp   sp;
1715
1716         if (hook == privp->debug_hook) {
1717                 privp->debug_hook = NULL;
1718         } else if (hook == privp->ethernet_hook) {
1719                 privp->ethernet_hook = NULL;
1720                 if (NG_NODE_IS_VALID(node))
1721                         ng_rmnode_self(node);
1722         } else {
1723                 sp = NG_HOOK_PRIVATE(hook);
1724                 if (sp->state != PPPOE_SNONE ) {
1725                         pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1726                 }
1727                 /*
1728                  * According to the spec, if we are connected,
1729                  * we should send a DISC packet if we are shutting down
1730                  * a session.
1731                  */
1732                 if ((privp->ethernet_hook)
1733                 && ((sp->state == PPPOE_CONNECTED)
1734                  || (sp->state == PPPOE_NEWCONNECTED))) {
1735                         struct mbuf *m;
1736
1737                         /* Generate a packet of that type. */
1738                         MGETHDR(m, M_DONTWAIT, MT_DATA);
1739                         if (m == NULL)
1740                                 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1741                                     "mbufs\n", node->nd_ID);
1742                         else {
1743                                 struct pppoe_full_hdr *wh;
1744                                 struct pppoe_tag *tag;
1745                                 int     msglen = strlen(SIGNOFF);
1746                                 int     error = 0;
1747
1748                                 m->m_pkthdr.rcvif = NULL;
1749                                 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1750                                 wh = mtod(m, struct pppoe_full_hdr *);
1751                                 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1752
1753                                 /* Revert the stored header to DISC/PADT mode. */
1754                                 wh->ph.code = PADT_CODE;
1755                                 /*
1756                                  * Configure ethertype depending on what
1757                                  * was used during sessions stage.
1758                                  */
1759                                 if (wh->eh.ether_type ==
1760                                     ETHERTYPE_PPPOE_3COM_SESS)
1761                                         wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1762                                 else
1763                                         wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1764                                 /*
1765                                  * Add a General error message and adjust
1766                                  * sizes.
1767                                  */
1768                                 tag = wh->ph.tag;
1769                                 tag->tag_type = PTT_GEN_ERR;
1770                                 tag->tag_len = htons((u_int16_t)msglen);
1771                                 strncpy(tag->tag_data, SIGNOFF, msglen);
1772                                 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1773                                     msglen);
1774                                 wh->ph.length = htons(sizeof(*tag) + msglen);
1775                                 NG_SEND_DATA_ONLY(error,
1776                                         privp->ethernet_hook, m);
1777                         }
1778                 }
1779                 /*
1780                  * As long as we have somewhere to store the timeout handle,
1781                  * we may have a timeout pending.. get rid of it.
1782                  */
1783                 if (sp->neg) {
1784                         ng_uncallout(&sp->neg->handle, node);
1785                         if (sp->neg->m)
1786                                 m_freem(sp->neg->m);
1787                         free(sp->neg, M_NETGRAPH_PPPOE);
1788                 }
1789                 free(sp, M_NETGRAPH_PPPOE);
1790                 NG_HOOK_SET_PRIVATE(hook, NULL);
1791         }
1792         if ((NG_NODE_NUMHOOKS(node) == 0) &&
1793             (NG_NODE_IS_VALID(node)))
1794                 ng_rmnode_self(node);
1795         return (0);
1796 }
1797
1798 /*
1799  * Timeouts come here.
1800  */
1801 static void
1802 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2)
1803 {
1804         priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
1805         sessp   sp = NG_HOOK_PRIVATE(hook);
1806         negp    neg = sp->neg;
1807         struct mbuf *m0 = NULL;
1808         int     error = 0;
1809
1810         CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d",
1811             __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID);
1812         switch(sp->state) {
1813                 /*
1814                  * Resend the last packet, using an exponential backoff.
1815                  * After a period of time, stop growing the backoff,
1816                  * And either leave it, or revert to the start.
1817                  */
1818         case    PPPOE_SINIT:
1819         case    PPPOE_SREQ:
1820                 /* Timeouts on these produce resends. */
1821                 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1822                 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1823                 ng_callout(&neg->handle, node, hook, neg->timeout * hz,
1824                     pppoe_ticker, NULL, 0);
1825                 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1826                         if (sp->state == PPPOE_SREQ) {
1827                                 /* Revert to SINIT mode. */
1828                                 pppoe_start(sp);
1829                         } else {
1830                                 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1831                         }
1832                 }
1833                 break;
1834         case    PPPOE_PRIMED:
1835         case    PPPOE_SOFFER:
1836                 /* A timeout on these says "give up" */
1837                 ng_rmhook_self(hook);
1838                 break;
1839         default:
1840                 /* Timeouts have no meaning in other states. */
1841                 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n",
1842                     node->nd_ID);
1843         }
1844 }
1845
1846 /*
1847  * Parse an incoming packet to see if any tags should be copied to the
1848  * output packet. Don't do any tags that have been handled in the main
1849  * state machine.
1850  */
1851 static const struct pppoe_tag*
1852 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1853 {
1854         const char *const end = (const char *)next_tag(ph);
1855         const char *ptn;
1856         const struct pppoe_tag *pt = &ph->tag[0];
1857
1858         /*
1859          * Keep processing tags while a tag header will still fit.
1860          */
1861         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1862
1863         while((const char*)(pt + 1) <= end) {
1864                 /*
1865                  * If the tag data would go past the end of the packet, abort.
1866                  */
1867                 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1868                 if(ptn > end)
1869                         return NULL;
1870
1871                 switch (pt->tag_type) {
1872                 case    PTT_RELAY_SID:
1873                         insert_tag(sp, pt);
1874                         break;
1875                 case    PTT_EOL:
1876                         return NULL;
1877                 case    PTT_SRV_NAME:
1878                 case    PTT_AC_NAME:
1879                 case    PTT_HOST_UNIQ:
1880                 case    PTT_AC_COOKIE:
1881                 case    PTT_VENDOR:
1882                 case    PTT_SRV_ERR:
1883                 case    PTT_SYS_ERR:
1884                 case    PTT_GEN_ERR:
1885                         break;
1886                 }
1887                 pt = (const struct pppoe_tag*)ptn;
1888         }
1889         return NULL;
1890 }
1891
1892 static  int
1893 pppoe_send_event(sessp sp, enum cmd cmdid)
1894 {
1895         int error;
1896         struct ng_mesg *msg;
1897         struct ngpppoe_sts *sts;
1898
1899         CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1900
1901         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1902                         sizeof(struct ngpppoe_sts), M_NOWAIT);
1903         if (msg == NULL)
1904                 return (ENOMEM);
1905         sts = (struct ngpppoe_sts *)msg->data;
1906         strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
1907         NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1908         return (error);
1909 }