sys/netgraph/pppoe/ng_pppoe.c

   1
   2 /*
   3  * ng_pppoe.c
   4  *
   5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   6  * All rights reserved.
   7  *
   8  * Subject to the following obligations and disclaimer of warranty, use and
   9  * redistribution of this software, in source or object code forms, with or
  10  * without modifications are expressly permitted by Whistle Communications;
  11  * provided, however, that:
  12  * 1. Any and all reproductions of the source or object code must include the
  13  *    copyright notice above and the following disclaimer of warranties; and
  14  * 2. No rights are granted, in any manner or form, to use Whistle
  15  *    Communications, Inc. trademarks, including the mark "WHISTLE
  16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  17  *    such appears in the above copyright notice or in the software.
  18  *
  19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  *
  37  * Author: Julian Elischer <julian@freebsd.org>
  38  *
  39  * $FreeBSD: src/sys/netgraph/ng_pppoe.c,v 1.23.2.17 2002/07/02 22:17:18 archie Exp $
  40  * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
  41  */
  42 #if 0
  43 #define AAA kprintf("pppoe: %s\n", __func__ );
  44 #define BBB kprintf("-%d-", __LINE__ );
  45 #else
  46 #define AAA
  47 #define BBB
  48 #endif
  49
  50 #include <sys/param.h>
  51 #include <sys/systm.h>
  52 #include <sys/kernel.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/malloc.h>
  55 #include <sys/errno.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/syslog.h>
  58 #include <sys/thread2.h>
  59
  60 #include <net/if_var.h>
  61 #include <net/ethernet.h>
  62
  63 #include <netgraph/ng_message.h>
  64 #include <netgraph/netgraph.h>
  65 #include "ng_pppoe.h"
  66
  67 #define SIGNOFF "session closed"
  68
  69 /*
  70  * This section contains the netgraph method declarations for the
  71  * pppoe node. These methods define the netgraph pppoe 'type'.
  72  */
  73
  74 static ng_constructor_t ng_pppoe_constructor;
  75 static ng_rcvmsg_t      ng_pppoe_rcvmsg;
  76 static ng_shutdown_t    ng_pppoe_rmnode;
  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_disconnect_t  ng_pppoe_disconnect;
  81
  82 /* Netgraph node type descriptor */
  83 static struct ng_type typestruct = {
  84         NG_VERSION,
  85         NG_PPPOE_NODE_TYPE,
  86         NULL,
  87         ng_pppoe_constructor,
  88         ng_pppoe_rcvmsg,
  89         ng_pppoe_rmnode,
  90         ng_pppoe_newhook,
  91         NULL,
  92         ng_pppoe_connect,
  93         ng_pppoe_rcvdata,
  94         ng_pppoe_rcvdata,
  95         ng_pppoe_disconnect,
  96         NULL
  97 };
  98 NETGRAPH_INIT(pppoe, &typestruct);
  99
 100 /*
 101  * States for the session state machine.
 102  * These have no meaning if there is no hook attached yet.
 103  */
 104 enum state {
 105     PPPOE_SNONE=0,      /* [both] Initial state */
 106     PPPOE_LISTENING,    /* [Daemon] Listening for discover initiation pkt */
 107     PPPOE_SINIT,        /* [Client] Sent discovery initiation */
 108     PPPOE_PRIMED,       /* [Server] Awaiting PADI from daemon */
 109     PPPOE_SOFFER,       /* [Server] Sent offer message  (got PADI)*/
 110     PPPOE_SREQ,         /* [Client] Sent a Request */
 111     PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
 112     PPPOE_CONNECTED,    /* [Both] Connection established, Data received */
 113     PPPOE_DEAD          /* [Both] */
 114 };
 115
 116 #define NUMTAGS 20 /* number of tags we are set up to work with */
 117
 118 /*
 119  * Information we store for each hook on each node for negotiating the
 120  * session. The mbuf and cluster are freed once negotiation has completed.
 121  * The whole negotiation block is then discarded.
 122  */
 123
 124 struct sess_neg {
 125         struct mbuf             *m; /* holds cluster with last sent packet */
 126         union   packet          *pkt; /* points within the above cluster */
 127         struct callout          timeout_ch;
 128         u_int                   timeout; /* 0,1,2,4,8,16 etc. seconds */
 129         u_int                   numtags;
 130         const struct pppoe_tag  *tags[NUMTAGS];
 131         u_int                   service_len;
 132         u_int                   ac_name_len;
 133
 134         struct datatag          service;
 135         struct datatag          ac_name;
 136 };
 137 typedef struct sess_neg *negp;
 138
 139 /*
 140  * Session information that is needed after connection.
 141  */
 142 struct sess_con {
 143         hook_p                  hook;
 144         u_int16_t               Session_ID;
 145         enum state              state;
 146         char                    creator[NG_NODESIZ]; /* who to notify */
 147         struct pppoe_full_hdr   pkt_hdr;        /* used when connected */
 148         negp                    neg;            /* used when negotiating */
 149         /*struct sess_con       *hash_next;*/   /* not yet used */
 150 };
 151 typedef struct sess_con *sessp;
 152
 153 /*
 154  * Information we store for each node
 155  */
 156 struct PPPOE {
 157         node_p          node;           /* back pointer to node */
 158         hook_p          ethernet_hook;
 159         hook_p          debug_hook;
 160         u_int           packets_in;     /* packets in from ethernet */
 161         u_int           packets_out;    /* packets out towards ethernet */
 162         u_int32_t       flags;
 163         /*struct sess_con *buckets[HASH_SIZE];*/        /* not yet used */
 164 };
 165 typedef struct PPPOE *priv_p;
 166
 167 struct ether_header eh_prototype =
 168         {{0xff,0xff,0xff,0xff,0xff,0xff},
 169          {0x00,0x00,0x00,0x00,0x00,0x00},
 170          ETHERTYPE_PPPOE_DISC};
 171
 172 #define PPPOE_KEEPSTANDARD      -1      /* never switch to nonstandard mode */
 173 #define PPPOE_STANDARD          0       /* try standard mode (dangerous!) */
 174 #define PPPOE_NONSTANDARD       1       /* just be in nonstandard mode */
 175 static int pppoe_mode = PPPOE_KEEPSTANDARD;
 176
 177 static int
 178 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
 179 {
 180         int error;
 181         int val;
 182
 183         val = pppoe_mode;
 184         error = sysctl_handle_int(oidp, &val, 0, req);
 185         if (error != 0 || req->newptr == NULL)
 186                 return (error);
 187         switch (val) {
 188         case PPPOE_NONSTANDARD:
 189                 pppoe_mode = PPPOE_NONSTANDARD;
 190                 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
 191                 break;
 192         case PPPOE_STANDARD:
 193                 pppoe_mode = PPPOE_STANDARD;
 194                 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
 195                 break;
 196         case PPPOE_KEEPSTANDARD:
 197                 pppoe_mode = PPPOE_KEEPSTANDARD;
 198                 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
 199                 break;
 200         default:
 201                 return (EINVAL);
 202         }
 203         return (0);
 204 }
 205
 206 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
 207     0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype");
 208
 209 union uniq {
 210         char bytes[sizeof(void *)];
 211         void * pointer;
 212         };
 213
 214 #define LEAVE(x) do { error = x; goto quit; } while(0)
 215 static void     pppoe_start(sessp sp);
 216 static void     sendpacket(sessp sp);
 217 static void     pppoe_ticker(void *arg);
 218 static const    struct pppoe_tag *scan_tags(sessp sp,
 219                         const struct pppoe_hdr* ph);
 220 static  int     pppoe_send_event(sessp sp, enum cmd cmdid);
 221
 222 /*************************************************************************
 223  * Some basic utilities  from the Linux version with author's permission.*
 224  * Author:      Michal Ostrowski <mostrows@styx.uwaterloo.ca>            *
 225  ************************************************************************/
 226
 227 /*
 228  * Generate a new session id
 229  * XXX find out the FreeBSD locking scheme.
 230  */
 231 static u_int16_t
 232 get_new_sid(node_p node)
 233 {
 234         static int pppoe_sid = 10;
 235         sessp sp;
 236         hook_p  hook;
 237         u_int16_t val;
 238         priv_p privp = node->private;
 239
 240 AAA
 241 restart:
 242         val = pppoe_sid++;
 243         /*
 244          * Spec says 0xFFFF is reserved.
 245          * Also don't use 0x0000
 246          */
 247         if (val == 0xffff) {
 248                 pppoe_sid = 20;
 249                 goto restart;
 250         }
 251
 252         /* Check it isn't already in use */
 253         LIST_FOREACH(hook, &node->hooks, hooks) {
 254                 /* don't check special hooks */
 255                 if ((hook->private == &privp->debug_hook)
 256                 ||  (hook->private == &privp->ethernet_hook))
 257                         continue;
 258                 sp = hook->private;
 259                 if (sp->Session_ID == val)
 260                         goto restart;
 261         }
 262
 263         return val;
 264 }
 265
 266
 267 /*
 268  * Return the location where the next tag can be put
 269  */
 270 static __inline const struct pppoe_tag*
 271 next_tag(const struct pppoe_hdr* ph)
 272 {
 273         return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
 274             + ntohs(ph->length));
 275 }
 276
 277 /*
 278  * Look for a tag of a specific type
 279  * Don't trust any length the other end says.
 280  * but assume we already sanity checked ph->length.
 281  */
 282 static const struct pppoe_tag*
 283 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
 284 {
 285         const char *const end = (const char *)next_tag(ph);
 286         const char *ptn;
 287         const struct pppoe_tag *pt = &ph->tag[0];
 288         /*
 289          * Keep processing tags while a tag header will still fit.
 290          */
 291 AAA
 292         while((const char*)(pt + 1) <= end) {
 293             /*
 294              * If the tag data would go past the end of the packet, abort.
 295              */
 296             ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
 297             if(ptn > end)
 298                 return NULL;
 299
 300             if(pt->tag_type == idx)
 301                 return pt;
 302
 303             pt = (const struct pppoe_tag*)ptn;
 304         }
 305         return NULL;
 306 }
 307
 308 /**************************************************************************
 309  * inlines to initialise or add tags to a session's tag list,
 310  **************************************************************************/
 311 /*
 312  * Initialise the session's tag list
 313  */
 314 static void
 315 init_tags(sessp sp)
 316 {
 317 AAA
 318         if(sp->neg == NULL) {
 319                 kprintf("pppoe: asked to init NULL neg pointer\n");
 320                 return;
 321         }
 322         sp->neg->numtags = 0;
 323 }
 324
 325 static void
 326 insert_tag(sessp sp, const struct pppoe_tag *tp)
 327 {
 328         int     i;
 329         negp neg;
 330
 331 AAA
 332         if((neg = sp->neg) == NULL) {
 333                 kprintf("pppoe: asked to use NULL neg pointer\n");
 334                 return;
 335         }
 336         if ((i = neg->numtags++) < NUMTAGS) {
 337                 neg->tags[i] = tp;
 338         } else {
 339                 kprintf("pppoe: asked to add too many tags to packet\n");
 340                 neg->numtags--;
 341         }
 342 }
 343
 344 /*
 345  * Make up a packet, using the tags filled out for the session.
 346  *
 347  * Assume that the actual pppoe header and ethernet header
 348  * are filled out externally to this routine.
 349  * Also assume that neg->wh points to the correct
 350  * location at the front of the buffer space.
 351  */
 352 static void
 353 make_packet(sessp sp) {
 354         struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
 355         const struct pppoe_tag **tag;
 356         char *dp;
 357         int count;
 358         int tlen;
 359         u_int16_t length = 0;
 360
 361 AAA
 362         if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
 363                 kprintf("pppoe: make_packet called from wrong state\n");
 364         }
 365         dp = (char *)wh->ph.tag;
 366         for (count = 0, tag = sp->neg->tags;
 367             ((count < sp->neg->numtags) && (count < NUMTAGS));
 368             tag++, count++) {
 369                 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
 370                 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
 371                         kprintf("pppoe: tags too long\n");
 372                         sp->neg->numtags = count;
 373                         break;  /* XXX chop off what's too long */
 374                 }
 375                 bcopy(*tag, dp, tlen);
 376                 length += tlen;
 377                 dp += tlen;
 378         }
 379         wh->ph.length = htons(length);
 380         sp->neg->m->m_len = length + sizeof(*wh);
 381         sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
 382 }
 383
 384 /**************************************************************************
 385  * Routine to match a service offered                                     *
 386  **************************************************************************/
 387 /*
 388  * Find a hook that has a service string that matches that
 389  * we are seeking. for now use a simple string.
 390  * In the future we may need something like regexp().
 391  * for testing allow a null string to match 1st found and a null service
 392  * to match all requests. Also make '*' do the same.
 393  */
 394
 395 #define NG_MATCH_EXACT  1
 396 #define NG_MATCH_ANY    2
 397
 398 static hook_p
 399 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
 400 {
 401         sessp   sp      = NULL;
 402         negp    neg     = NULL;
 403         priv_p  privp   = node->private;
 404         hook_p  allhook = NULL;
 405         hook_p  hook;
 406
 407 AAA
 408         LIST_FOREACH(hook, &node->hooks, hooks) {
 409
 410                 /* skip any hook that is debug or ethernet */
 411                 if ((hook->private == &privp->debug_hook)
 412                 ||  (hook->private == &privp->ethernet_hook))
 413                         continue;
 414                 sp = hook->private;
 415
 416                 /* Skip any sessions which are not in LISTEN mode. */
 417                 if ( sp->state != PPPOE_LISTENING)
 418                         continue;
 419
 420                 neg = sp->neg;
 421
 422                 /* Special case for a blank or "*" service name (wildcard) */
 423                 if (match == NG_MATCH_ANY && neg->service_len == 1 &&
 424                     neg->service.data[0] == '*') {
 425                         allhook = hook;
 426                         continue;
 427                 }
 428
 429                 /* If the lengths don't match, that aint it. */
 430                 if (neg->service_len != svc_len)
 431                         continue;
 432
 433                 /* An exact match? */
 434                 if (svc_len == 0)
 435                         break;
 436
 437                 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
 438                         break;
 439         }
 440         return (hook ? hook : allhook);
 441 }
 442 /**************************************************************************
 443  * Routine to find a particular session that matches an incoming packet   *
 444  **************************************************************************/
 445 static hook_p
 446 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
 447 {
 448         sessp   sp = NULL;
 449         hook_p hook = NULL;
 450         priv_p  privp = node->private;
 451         u_int16_t       session = ntohs(wh->ph.sid);
 452
 453         /*
 454          * find matching peer/session combination.
 455          */
 456 AAA
 457         LIST_FOREACH(hook, &node->hooks, hooks) {
 458                 /* don't check special hooks */
 459                 if ((hook->private == &privp->debug_hook)
 460                 ||  (hook->private == &privp->ethernet_hook)) {
 461                         continue;
 462                 }
 463                 sp = hook->private;
 464                 if ( ( (sp->state == PPPOE_CONNECTED)
 465                     || (sp->state == PPPOE_NEWCONNECTED) )
 466                 && (sp->Session_ID == session)
 467                 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
 468                     wh->eh.ether_shost,
 469                     ETHER_ADDR_LEN)) == 0) {
 470                         break;
 471                 }
 472         }
 473         return (hook);
 474 }
 475
 476 static hook_p
 477 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
 478 {
 479         hook_p hook = NULL;
 480         priv_p  privp = node->private;
 481         union uniq              uniq;
 482
 483 AAA
 484         bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
 485         /* cycle through all known hooks */
 486         LIST_FOREACH(hook, &node->hooks, hooks) {
 487                 /* don't check special hooks */
 488                 if ((hook->private == &privp->debug_hook)
 489                 ||  (hook->private == &privp->ethernet_hook))
 490                         continue;
 491                 if (uniq.pointer == hook->private)
 492                         break;
 493         }
 494         return (hook);
 495 }
 496
 497 /**************************************************************************
 498  * start of Netgraph entrypoints                                          *
 499  **************************************************************************/
 500
 501 /*
 502  * Allocate the private data structure and the generic node
 503  * and link them together.
 504  *
 505  * ng_make_node_common() returns with a generic node struct
 506  * with a single reference for us.. we transfer it to the
 507  * private structure.. when we free the private struct we must
 508  * unref the node so it gets freed too.
 509  */
 510 static int
 511 ng_pppoe_constructor(node_p *nodep)
 512 {
 513         priv_p privdata;
 514         int error;
 515
 516 AAA
 517         /* Initialize private descriptor */
 518         privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO);
 519         if (privdata == NULL)
 520                 return (ENOMEM);
 521
 522         /* Call the 'generic' (ie, superclass) node constructor */
 523         if ((error = ng_make_node_common(&typestruct, nodep))) {
 524                 kfree(privdata, M_NETGRAPH);
 525                 return (error);
 526         }
 527
 528         /* Link structs together; this counts as our one reference to *nodep */
 529         (*nodep)->private = privdata;
 530         privdata->node = *nodep;
 531         return (0);
 532 }
 533
 534 /*
 535  * Give our ok for a hook to be added...
 536  * point the hook's private info to the hook structure.
 537  *
 538  * The following hook names are special:
 539  *  Ethernet:  the hook that should be connected to a NIC.
 540  *  debug:      copies of data sent out here  (when I write the code).
 541  * All other hook names need only be unique. (the framework checks this).
 542  */
 543 static int
 544 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
 545 {
 546         const priv_p privp = node->private;
 547         sessp sp;
 548
 549 AAA
 550         if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
 551                 privp->ethernet_hook = hook;
 552                 hook->private = &privp->ethernet_hook;
 553         } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
 554                 privp->debug_hook = hook;
 555                 hook->private = &privp->debug_hook;
 556         } else {
 557                 /*
 558                  * Any other unique name is OK.
 559                  * The infrastructure has already checked that it's unique,
 560                  * so just allocate it and hook it in.
 561                  */
 562                 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO);
 563                 if (sp == NULL)
 564                         return (ENOMEM);
 565
 566                 hook->private = sp;
 567                 sp->hook = hook;
 568         }
 569         return(0);
 570 }
 571
 572 /*
 573  * Get a netgraph control message.
 574  * Check it is one we understand. If needed, send a response.
 575  * We sometimes save the address for an async action later.
 576  * Always free the message.
 577  */
 578 static int
 579 ng_pppoe_rcvmsg(node_p node,
 580            struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
 581 {
 582         priv_p privp = node->private;
 583         struct ngpppoe_init_data *ourmsg = NULL;
 584         struct ng_mesg *resp = NULL;
 585         int error = 0;
 586         hook_p hook = NULL;
 587         sessp sp = NULL;
 588         negp neg = NULL;
 589
 590 AAA
 591         /* Deal with message according to cookie and command */
 592         switch (msg->header.typecookie) {
 593         case NGM_PPPOE_COOKIE:
 594                 switch (msg->header.cmd) {
 595                 case NGM_PPPOE_CONNECT:
 596                 case NGM_PPPOE_LISTEN:
 597                 case NGM_PPPOE_OFFER:
 598                 case NGM_PPPOE_SERVICE:
 599                         ourmsg = (struct ngpppoe_init_data *)msg->data;
 600                         if (( sizeof(*ourmsg) > msg->header.arglen)
 601                         || ((sizeof(*ourmsg) + ourmsg->data_len)
 602                             > msg->header.arglen)) {
 603                                 kprintf("pppoe_rcvmsg: bad arg size");
 604                                 LEAVE(EMSGSIZE);
 605                         }
 606                         if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) {
 607                                 kprintf("pppoe: init data too long (%d)\n",
 608                                                         ourmsg->data_len);
 609                                 LEAVE(EMSGSIZE);
 610                         }
 611                         /* make sure strcmp will terminate safely */
 612                         ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
 613
 614                         /* cycle through all known hooks */
 615                         LIST_FOREACH(hook, &node->hooks, hooks) {
 616                                 if (hook->name
 617                                 && strcmp(hook->name, ourmsg->hook) == 0)
 618                                         break;
 619                         }
 620                         if (hook == NULL) {
 621                                 LEAVE(ENOENT);
 622                         }
 623                         if ((hook->private == &privp->debug_hook)
 624                         ||  (hook->private == &privp->ethernet_hook)) {
 625                                 LEAVE(EINVAL);
 626                         }
 627                         sp = hook->private;
 628
 629                         if (msg->header.cmd == NGM_PPPOE_LISTEN) {
 630                                 /*
 631                                  * Ensure we aren't already listening for this
 632                                  * service.
 633                                  */
 634                                 if (pppoe_match_svc(node, ourmsg->data,
 635                                     ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
 636                                         LEAVE(EEXIST);
 637                                 }
 638                         }
 639
 640                         /*
 641                          * PPPOE_SERVICE advertisments are set up
 642                          * on sessions that are in PRIMED state.
 643                          */
 644                         if (msg->header.cmd == NGM_PPPOE_SERVICE) {
 645                                 break;
 646                         }
 647                         if (sp->state != PPPOE_SNONE) {
 648                                 kprintf("pppoe: Session already active\n");
 649                                 LEAVE(EISCONN);
 650                         }
 651
 652                         /*
 653                          * set up prototype header
 654                          */
 655                         neg = kmalloc(sizeof(*neg), M_NETGRAPH,
 656                                       M_NOWAIT | M_ZERO);
 657
 658                         if (neg == NULL) {
 659                                 kprintf("pppoe: Session out of memory\n");
 660                                 LEAVE(ENOMEM);
 661                         }
 662                         MGETHDR(neg->m, MB_DONTWAIT, MT_DATA);
 663                         if(neg->m == NULL) {
 664                                 kprintf("pppoe: Session out of mbufs\n");
 665                                 kfree(neg, M_NETGRAPH);
 666                                 LEAVE(ENOBUFS);
 667                         }
 668                         neg->m->m_pkthdr.rcvif = NULL;
 669                         MCLGET(neg->m, MB_DONTWAIT);
 670                         if ((neg->m->m_flags & M_EXT) == 0) {
 671                                 kprintf("pppoe: Session out of mcls\n");
 672                                 m_freem(neg->m);
 673                                 kfree(neg, M_NETGRAPH);
 674                                 LEAVE(ENOBUFS);
 675                         }
 676                         sp->neg = neg;
 677                         callout_init(&neg->timeout_ch);
 678                         neg->m->m_len = sizeof(struct pppoe_full_hdr);
 679                         neg->pkt = mtod(neg->m, union packet*);
 680                         neg->pkt->pkt_header.eh = eh_prototype;
 681                         neg->pkt->pkt_header.ph.ver = 0x1;
 682                         neg->pkt->pkt_header.ph.type = 0x1;
 683                         neg->pkt->pkt_header.ph.sid = 0x0000;
 684                         neg->timeout = 0;
 685
 686                         strlcpy(sp->creator, retaddr, NG_NODESIZ);
 687                 }
 688                 switch (msg->header.cmd) {
 689                 case NGM_PPPOE_GET_STATUS:
 690                     {
 691                         struct ngpppoestat *stats;
 692
 693                         NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
 694                         if (!resp) {
 695                                 LEAVE(ENOMEM);
 696                         }
 697                         stats = (struct ngpppoestat *) resp->data;
 698                         stats->packets_in = privp->packets_in;
 699                         stats->packets_out = privp->packets_out;
 700                         break;
 701                     }
 702                 case NGM_PPPOE_CONNECT:
 703                         /*
 704                          * Check the hook exists and is Uninitialised.
 705                          * Send a PADI request, and start the timeout logic.
 706                          * Store the originator of this message so we can send
 707                          * a success of fail message to them later.
 708                          * Move the session to SINIT
 709                          * Set up the session to the correct state and
 710                          * start it.
 711                          */
 712                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 713                         neg->service.hdr.tag_len =
 714                                         htons((u_int16_t)ourmsg->data_len);
 715                         if (ourmsg->data_len) {
 716                                 bcopy(ourmsg->data,
 717                                         neg->service.data, ourmsg->data_len);
 718                         }
 719                         neg->service_len = ourmsg->data_len;
 720                         pppoe_start(sp);
 721                         break;
 722                 case NGM_PPPOE_LISTEN:
 723                         /*
 724                          * Check the hook exists and is Uninitialised.
 725                          * Install the service matching string.
 726                          * Store the originator of this message so we can send
 727                          * a success of fail message to them later.
 728                          * Move the hook to 'LISTENING'
 729                          */
 730                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 731                         neg->service.hdr.tag_len =
 732                                         htons((u_int16_t)ourmsg->data_len);
 733
 734                         if (ourmsg->data_len) {
 735                                 bcopy(ourmsg->data,
 736                                         neg->service.data, ourmsg->data_len);
 737                         }
 738                         neg->service_len = ourmsg->data_len;
 739                         neg->pkt->pkt_header.ph.code = PADT_CODE;
 740                         /*
 741                          * wait for PADI packet coming from ethernet
 742                          */
 743                         sp->state = PPPOE_LISTENING;
 744                         break;
 745                 case NGM_PPPOE_OFFER:
 746                         /*
 747                          * Check the hook exists and is Uninitialised.
 748                          * Store the originator of this message so we can send
 749                          * a success of fail message to them later.
 750                          * Store the AC-Name given and go to PRIMED.
 751                          */
 752                         neg->ac_name.hdr.tag_type = PTT_AC_NAME;
 753                         neg->ac_name.hdr.tag_len =
 754                                         htons((u_int16_t)ourmsg->data_len);
 755                         if (ourmsg->data_len) {
 756                                 bcopy(ourmsg->data,
 757                                         neg->ac_name.data, ourmsg->data_len);
 758                         }
 759                         neg->ac_name_len = ourmsg->data_len;
 760                         neg->pkt->pkt_header.ph.code = PADO_CODE;
 761                         /*
 762                          * Wait for PADI packet coming from hook
 763                          */
 764                         sp->state = PPPOE_PRIMED;
 765                         break;
 766                 case NGM_PPPOE_SERVICE:
 767                         /*
 768                          * Check the session is primed.
 769                          * for now just allow ONE service to be advertised.
 770                          * If you do it twice you just overwrite.
 771                          */
 772                         if (sp->state != PPPOE_PRIMED) {
 773                                 kprintf("pppoe: Session not primed\n");
 774                                 LEAVE(EISCONN);
 775                         }
 776                         neg = sp->neg;
 777                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 778                         neg->service.hdr.tag_len =
 779                             htons((u_int16_t)ourmsg->data_len);
 780
 781                         if (ourmsg->data_len)
 782                                 bcopy(ourmsg->data, neg->service.data,
 783                                     ourmsg->data_len);
 784                         neg->service_len = ourmsg->data_len;
 785                         break;
 786                 default:
 787                         LEAVE(EINVAL);
 788                 }
 789                 break;
 790         default:
 791                 LEAVE(EINVAL);
 792         }
 793
 794         /* Take care of synchronous response, if any */
 795         if (rptr)
 796                 *rptr = resp;
 797         else if (resp)
 798                 kfree(resp, M_NETGRAPH);
 799
 800         /* Free the message and return */
 801 quit:
 802         kfree(msg, M_NETGRAPH);
 803         return(error);
 804 }
 805
 806 /*
 807  * Start a client into the first state. A separate function because
 808  * it can be needed if the negotiation times out.
 809  */
 810 static void
 811 pppoe_start(sessp sp)
 812 {
 813         struct {
 814                 struct pppoe_tag hdr;
 815                 union   uniq    data;
 816         } __attribute ((packed)) uniqtag;
 817
 818         /*
 819          * kick the state machine into starting up
 820          */
 821 AAA
 822         sp->state = PPPOE_SINIT;
 823         /* reset the packet header to broadcast */
 824         sp->neg->pkt->pkt_header.eh = eh_prototype;
 825         sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
 826         uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
 827         uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
 828         uniqtag.data.pointer = sp;
 829         init_tags(sp);
 830         insert_tag(sp, &uniqtag.hdr);
 831         insert_tag(sp, &sp->neg->service.hdr);
 832         make_packet(sp);
 833         sendpacket(sp);
 834 }
 835
 836 static int
 837 send_acname(sessp sp, const struct pppoe_tag *tag)
 838 {
 839         int error, tlen;
 840         struct ng_mesg *msg;
 841         struct ngpppoe_sts *sts;
 842
 843         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
 844             sizeof(struct ngpppoe_sts), M_NOWAIT);
 845         if (msg == NULL)
 846                 return (ENOMEM);
 847
 848         sts = (struct ngpppoe_sts *)msg->data;
 849         tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
 850         strncpy(sts->hook, tag->tag_data, tlen);
 851         sts->hook[tlen] = '\0';
 852         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
 853
 854         return (error);
 855 }
 856
 857 static int
 858 send_sessionid(sessp sp)
 859 {
 860         int error;
 861         struct ng_mesg *msg;
 862
 863         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
 864             sizeof(u_int16_t), M_NOWAIT);
 865         if (msg == NULL)
 866                 return (ENOMEM);
 867
 868         *(u_int16_t *)msg->data = sp->Session_ID;
 869         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
 870
 871         return (error);
 872 }
 873
 874 /*
 875  * Receive data, and do something with it.
 876  * The caller will never free m or meta, so
 877  * if we use up this data or abort we must free BOTH of these.
 878  */
 879 static int
 880 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 881 {
 882         node_p                  node = hook->node;
 883         const priv_p            privp = node->private;
 884         sessp                   sp = hook->private;
 885         const struct pppoe_full_hdr *wh;
 886         const struct pppoe_hdr  *ph;
 887         int                     error = 0;
 888         u_int16_t               length;
 889         u_int8_t                code;
 890         const struct pppoe_tag  *utag = NULL, *tag = NULL;
 891         hook_p                  sendhook;
 892         struct {
 893                 struct pppoe_tag hdr;
 894                 union   uniq    data;
 895         } __attribute ((packed)) uniqtag;
 896         negp                    neg = NULL;
 897         char ethstr[ETHER_ADDRSTRLEN + 1];
 898
 899 AAA
 900         if (hook->private == &privp->debug_hook) {
 901                 /*
 902                  * Data from the debug hook gets sent without modification
 903                  * straight to the ethernet.
 904                  */
 905                 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
 906                 privp->packets_out++;
 907         } else if (hook->private == &privp->ethernet_hook) {
 908                 /*
 909                  * Incoming data.
 910                  * Dig out various fields from the packet.
 911                  * use them to decide where to send it.
 912                  */
 913
 914                 privp->packets_in++;
 915                 if( m->m_len < sizeof(*wh)) {
 916                         m = m_pullup(m, sizeof(*wh)); /* Checks length */
 917                         if (m == NULL) {
 918                                 kprintf("couldn't m_pullup\n");
 919                                 LEAVE(ENOBUFS);
 920                         }
 921                 }
 922                 wh = mtod(m, struct pppoe_full_hdr *);
 923                 ph = &wh->ph;
 924                 length = ntohs(wh->ph.length);
 925                 code = wh->ph.code;
 926                 switch(wh->eh.ether_type) {
 927                 case    ETHERTYPE_PPPOE_STUPID_DISC:
 928                         if (pppoe_mode == PPPOE_STANDARD) {
 929                                 pppoe_mode = PPPOE_NONSTANDARD;
 930                                 eh_prototype.ether_type =
 931                                     ETHERTYPE_PPPOE_STUPID_DISC;
 932                                 log(LOG_NOTICE,
 933                                     "Switched to nonstandard PPPoE mode due to "
 934                                     "packet from %s\n",
 935                                     kether_ntoa(wh->eh.ether_shost, ethstr));
 936                         } else if (pppoe_mode == PPPOE_KEEPSTANDARD)
 937                                 log(LOG_NOTICE,
 938                                     "Ignored nonstandard PPPoE packet "
 939                                     "from %s\n",
 940                                     kether_ntoa(wh->eh.ether_shost, ethstr));
 941                         /* fall through */
 942                 case    ETHERTYPE_PPPOE_DISC:
 943                         /*
 944                          * We need to try to make sure that the tag area
 945                          * is contiguous, or we could wander off the end
 946                          * of a buffer and make a mess.
 947                          * (Linux wouldn't have this problem).
 948                          */
 949 /*XXX fix this mess */
 950
 951                         if (m->m_pkthdr.len <= MHLEN) {
 952                                 if( m->m_len < m->m_pkthdr.len) {
 953                                         m = m_pullup(m, m->m_pkthdr.len);
 954                                         if (m == NULL) {
 955                                                 kprintf("couldn't m_pullup\n");
 956                                                 LEAVE(ENOBUFS);
 957                                         }
 958                                 }
 959                         }
 960                         if (m->m_len != m->m_pkthdr.len) {
 961                                 /*
 962                                  * It's not all in one piece.
 963                                  * We need to do extra work.
 964                                  */
 965                                 kprintf("packet fragmented\n");
 966                                 LEAVE(EMSGSIZE);
 967                         }
 968
 969                         switch(code) {
 970                         case    PADI_CODE:
 971                                 /*
 972                                  * We are a server:
 973                                  * Look for a hook with the required service
 974                                  * and send the ENTIRE packet up there.
 975                                  * It should come back to a new hook in
 976                                  * PRIMED state. Look there for further
 977                                  * processing.
 978                                  */
 979                                 tag = get_tag(ph, PTT_SRV_NAME);
 980                                 if (tag == NULL) {
 981                                         kprintf("no service tag\n");
 982                                         LEAVE(ENETUNREACH);
 983                                 }
 984                                 sendhook = pppoe_match_svc(hook->node,
 985                                         tag->tag_data, ntohs(tag->tag_len),
 986                                         NG_MATCH_ANY);
 987                                 if (sendhook) {
 988                                         NG_SEND_DATA(error, sendhook, m, meta);
 989                                 } else {
 990                                         LEAVE(ENETUNREACH);
 991                                 }
 992                                 break;
 993                         case    PADO_CODE:
 994                                 /*
 995                                  * We are a client:
 996                                  * Use the host_uniq tag to find the
 997                                  * hook this is in response to.
 998                                  * Received #2, now send #3
 999                                  * For now simply accept the first we receive.
1000                                  */
1001                                 utag = get_tag(ph, PTT_HOST_UNIQ);
1002                                 if ((utag == NULL)
1003                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1004                                         kprintf("no host unique field\n");
1005                                         LEAVE(ENETUNREACH);
1006                                 }
1007
1008                                 sendhook = pppoe_finduniq(node, utag);
1009                                 if (sendhook == NULL) {
1010                                         kprintf("no matching session\n");
1011                                         LEAVE(ENETUNREACH);
1012                                 }
1013
1014                                 /*
1015                                  * Check the session is in the right state.
1016                                  * It needs to be in PPPOE_SINIT.
1017                                  */
1018                                 sp = sendhook->private;
1019                                 if (sp->state != PPPOE_SINIT) {
1020                                         kprintf("session in wrong state\n");
1021                                         LEAVE(ENETUNREACH);
1022                                 }
1023                                 neg = sp->neg;
1024                                 callout_stop(&neg->timeout_ch);
1025
1026                                 /*
1027                                  * This is the first time we hear
1028                                  * from the server, so note it's
1029                                  * unicast address, replacing the
1030                                  * broadcast address .
1031                                  */
1032                                 bcopy(wh->eh.ether_shost,
1033                                         neg->pkt->pkt_header.eh.ether_dhost,
1034                                         ETHER_ADDR_LEN);
1035                                 neg->timeout = 0;
1036                                 neg->pkt->pkt_header.ph.code = PADR_CODE;
1037                                 init_tags(sp);
1038                                 insert_tag(sp, utag);      /* Host Unique */
1039                                 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1040                                         insert_tag(sp, tag); /* return cookie */
1041                                 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1042                                         insert_tag(sp, tag); /* return it */
1043                                         send_acname(sp, tag);
1044                                 }
1045                                 insert_tag(sp, &neg->service.hdr); /* Service */
1046                                 scan_tags(sp, ph);
1047                                 make_packet(sp);
1048                                 sp->state = PPPOE_SREQ;
1049                                 sendpacket(sp);
1050                                 break;
1051                         case    PADR_CODE:
1052
1053                                 /*
1054                                  * We are a server:
1055                                  * Use the ac_cookie tag to find the
1056                                  * hook this is in response to.
1057                                  */
1058                                 utag = get_tag(ph, PTT_AC_COOKIE);
1059                                 if ((utag == NULL)
1060                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1061                                         LEAVE(ENETUNREACH);
1062                                 }
1063
1064                                 sendhook = pppoe_finduniq(node, utag);
1065                                 if (sendhook == NULL) {
1066                                         LEAVE(ENETUNREACH);
1067                                 }
1068
1069                                 /*
1070                                  * Check the session is in the right state.
1071                                  * It needs to be in PPPOE_SOFFER
1072                                  * or PPPOE_NEWCONNECTED. If the latter,
1073                                  * then this is a retry by the client.
1074                                  * so be nice, and resend.
1075                                  */
1076                                 sp = sendhook->private;
1077                                 if (sp->state == PPPOE_NEWCONNECTED) {
1078                                         /*
1079                                          * Whoa! drop back to resend that
1080                                          * PADS packet.
1081                                          * We should still have a copy of it.
1082                                          */
1083                                         sp->state = PPPOE_SOFFER;
1084                                 }
1085                                 if (sp->state != PPPOE_SOFFER) {
1086                                         LEAVE (ENETUNREACH);
1087                                         break;
1088                                 }
1089                                 neg = sp->neg;
1090                                 callout_stop(&neg->timeout_ch);
1091                                 neg->pkt->pkt_header.ph.code = PADS_CODE;
1092                                 if (sp->Session_ID == 0)
1093                                         neg->pkt->pkt_header.ph.sid =
1094                                             htons(sp->Session_ID
1095                                                 = get_new_sid(node));
1096                                 send_sessionid(sp);
1097                                 neg->timeout = 0;
1098                                 /*
1099                                  * start working out the tags to respond with.
1100                                  */
1101                                 init_tags(sp);
1102                                 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1103                                 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1104                                         insert_tag(sp, tag);/* return service */
1105                                 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1106                                         insert_tag(sp, tag); /* return it */
1107                                 insert_tag(sp, utag);   /* ac_cookie */
1108                                 scan_tags(sp, ph);
1109                                 make_packet(sp);
1110                                 sp->state = PPPOE_NEWCONNECTED;
1111                                 sendpacket(sp);
1112                                 /*
1113                                  * Having sent the last Negotiation header,
1114                                  * Set up the stored packet header to
1115                                  * be correct for the actual session.
1116                                  * But keep the negotialtion stuff
1117                                  * around in case we need to resend this last
1118                                  * packet. We'll discard it when we move
1119                                  * from NEWCONNECTED to CONNECTED
1120                                  */
1121                                 sp->pkt_hdr = neg->pkt->pkt_header;
1122                                 if (pppoe_mode == PPPOE_NONSTANDARD)
1123                                         sp->pkt_hdr.eh.ether_type
1124                                                 = ETHERTYPE_PPPOE_STUPID_SESS;
1125                                 else
1126                                         sp->pkt_hdr.eh.ether_type
1127                                                 = ETHERTYPE_PPPOE_SESS;
1128                                 sp->pkt_hdr.ph.code = 0;
1129                                 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1130                                 break;
1131                         case    PADS_CODE:
1132                                 /*
1133                                  * We are a client:
1134                                  * Use the host_uniq tag to find the
1135                                  * hook this is in response to.
1136                                  * take the session ID and store it away.
1137                                  * Also make sure the pre-made header is
1138                                  * correct and set us into Session mode.
1139                                  */
1140                                 utag = get_tag(ph, PTT_HOST_UNIQ);
1141                                 if ((utag == NULL)
1142                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1143                                         LEAVE (ENETUNREACH);
1144                                         break;
1145                                 }
1146                                 sendhook = pppoe_finduniq(node, utag);
1147                                 if (sendhook == NULL) {
1148                                         LEAVE(ENETUNREACH);
1149                                 }
1150
1151                                 /*
1152                                  * Check the session is in the right state.
1153                                  * It needs to be in PPPOE_SREQ.
1154                                  */
1155                                 sp = sendhook->private;
1156                                 if (sp->state != PPPOE_SREQ) {
1157                                         LEAVE(ENETUNREACH);
1158                                 }
1159                                 neg = sp->neg;
1160                                 callout_stop(&neg->timeout_ch);
1161                                 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1162                                 sp->Session_ID = ntohs(wh->ph.sid);
1163                                 send_sessionid(sp);
1164                                 neg->timeout = 0;
1165                                 sp->state = PPPOE_CONNECTED;
1166                                 /*
1167                                  * Now we have gone to Connected mode,
1168                                  * Free all resources needed for
1169                                  * negotiation.
1170                                  * Keep a copy of the header we will be using.
1171                                  */
1172                                 sp->pkt_hdr = neg->pkt->pkt_header;
1173                                 if (pppoe_mode == PPPOE_NONSTANDARD)
1174                                         sp->pkt_hdr.eh.ether_type
1175                                                 = ETHERTYPE_PPPOE_STUPID_SESS;
1176                                 else
1177                                         sp->pkt_hdr.eh.ether_type
1178                                                 = ETHERTYPE_PPPOE_SESS;
1179                                 sp->pkt_hdr.ph.code = 0;
1180                                 m_freem(neg->m);
1181                                 kfree(sp->neg, M_NETGRAPH);
1182                                 sp->neg = NULL;
1183                                 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1184                                 break;
1185                         case    PADT_CODE:
1186                                 /*
1187                                  * Send a 'close' message to the controlling
1188                                  * process (the one that set us up);
1189                                  * And then tear everything down.
1190                                  *
1191                                  * Find matching peer/session combination.
1192                                  */
1193                                 sendhook = pppoe_findsession(node, wh);
1194                                 NG_FREE_DATA(m, meta); /* no longer needed */
1195                                 if (sendhook == NULL) {
1196                                         LEAVE(ENETUNREACH);
1197                                 }
1198                                 /* send message to creator */
1199                                 /* close hook */
1200                                 if (sendhook) {
1201                                         ng_destroy_hook(sendhook);
1202                                 }
1203                                 break;
1204                         default:
1205                                 LEAVE(EPFNOSUPPORT);
1206                         }
1207                         break;
1208                 case    ETHERTYPE_PPPOE_STUPID_SESS:
1209                 case    ETHERTYPE_PPPOE_SESS:
1210                         /*
1211                          * find matching peer/session combination.
1212                          */
1213                         sendhook = pppoe_findsession(node, wh);
1214                         if (sendhook == NULL) {
1215                                 LEAVE (ENETUNREACH);
1216                                 break;
1217                         }
1218                         sp = sendhook->private;
1219                         m_adj(m, sizeof(*wh));
1220                         if (m->m_pkthdr.len < length) {
1221                                 /* Packet too short, dump it */
1222                                 LEAVE(EMSGSIZE);
1223                         }
1224
1225                         /* Also need to trim excess at the end */
1226                         if (m->m_pkthdr.len > length) {
1227                                 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1228                         }
1229                         if ( sp->state != PPPOE_CONNECTED) {
1230                                 if (sp->state == PPPOE_NEWCONNECTED) {
1231                                         sp->state = PPPOE_CONNECTED;
1232                                         /*
1233                                          * Now we have gone to Connected mode,
1234                                          * Free all resources needed for
1235                                          * negotiation. Be paranoid about
1236                                          * whether there may be a timeout.
1237                                          */
1238                                         m_freem(sp->neg->m);
1239                                         callout_stop(&sp->neg->timeout_ch);
1240                                         kfree(sp->neg, M_NETGRAPH);
1241                                         sp->neg = NULL;
1242                                 } else {
1243                                         LEAVE (ENETUNREACH);
1244                                         break;
1245                                 }
1246                         }
1247                         NG_SEND_DATA( error, sendhook, m, meta);
1248                         break;
1249                 default:
1250                         LEAVE(EPFNOSUPPORT);
1251                 }
1252         } else {
1253                 /*
1254                  *      Not ethernet or debug hook..
1255                  *
1256                  * The packet has come in on a normal hook.
1257                  * We need to find out what kind of hook,
1258                  * So we can decide how to handle it.
1259                  * Check the hook's state.
1260                  */
1261                 sp = hook->private;
1262                 switch (sp->state) {
1263                 case    PPPOE_NEWCONNECTED:
1264                 case    PPPOE_CONNECTED: {
1265                         static const u_char addrctrl[] = { 0xff, 0x03 };
1266                         struct pppoe_full_hdr *wh;
1267
1268                         /*
1269                          * Remove PPP address and control fields, if any.
1270                          * For example, ng_ppp(4) always sends LCP packets
1271                          * with address and control fields as required by
1272                          * generic PPP. PPPoE is an exception to the rule.
1273                          */
1274                         if (m->m_pkthdr.len >= 2) {
1275                                 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1276                                         LEAVE(ENOBUFS);
1277                                 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
1278                                         m_adj(m, 2);
1279                         }
1280                         /*
1281                          * Bang in a pre-made header, and set the length up
1282                          * to be correct. Then send it to the ethernet driver.
1283                          * But first correct the length.
1284                          */
1285                         sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1286                         M_PREPEND(m, sizeof(*wh), MB_DONTWAIT);
1287                         if (m == NULL) {
1288                                 LEAVE(ENOBUFS);
1289                         }
1290                         wh = mtod(m, struct pppoe_full_hdr *);
1291                         bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1292                         NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
1293                         privp->packets_out++;
1294                         break;
1295                         }
1296                 case    PPPOE_PRIMED:
1297                         /*
1298                          * A PADI packet is being returned by the application
1299                          * that has set up this hook. This indicates that it
1300                          * wants us to offer service.
1301                          */
1302                         neg = sp->neg;
1303                         if (m->m_len < sizeof(*wh)) {
1304                                 m = m_pullup(m, sizeof(*wh));
1305                                 if (m == NULL) {
1306                                         LEAVE(ENOBUFS);
1307                                 }
1308                         }
1309                         wh = mtod(m, struct pppoe_full_hdr *);
1310                         ph = &wh->ph;
1311                         length = ntohs(wh->ph.length);
1312                         code = wh->ph.code;
1313                         if ( code != PADI_CODE) {
1314                                 LEAVE(EINVAL);
1315                         }
1316                         callout_stop(&neg->timeout_ch);
1317
1318                         /*
1319                          * This is the first time we hear
1320                          * from the client, so note it's
1321                          * unicast address, replacing the
1322                          * broadcast address.
1323                          */
1324                         bcopy(wh->eh.ether_shost,
1325                                 neg->pkt->pkt_header.eh.ether_dhost,
1326                                 ETHER_ADDR_LEN);
1327                         sp->state = PPPOE_SOFFER;
1328                         neg->timeout = 0;
1329                         neg->pkt->pkt_header.ph.code = PADO_CODE;
1330
1331                         /*
1332                          * start working out the tags to respond with.
1333                          */
1334                         uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1335                         uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1336                         uniqtag.data.pointer = sp;
1337                         init_tags(sp);
1338                         insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1339                         if ((tag = get_tag(ph, PTT_SRV_NAME)))
1340                                 insert_tag(sp, tag);      /* return service */
1341                         /*
1342                          * If we have a NULL service request
1343                          * and have an extra service defined in this hook,
1344                          * then also add a tag for the extra service.
1345                          * XXX this is a hack. eventually we should be able
1346                          * to support advertising many services, not just one
1347                          */
1348                         if (((tag == NULL) || (tag->tag_len == 0))
1349                         && (neg->service.hdr.tag_len != 0)) {
1350                                 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1351                         }
1352                         if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1353                                 insert_tag(sp, tag); /* returned hostunique */
1354                         insert_tag(sp, &uniqtag.hdr);
1355                         scan_tags(sp, ph);
1356                         make_packet(sp);
1357                         sendpacket(sp);
1358                         break;
1359
1360                 /*
1361                  * Packets coming from the hook make no sense
1362                  * to sessions in these states. Throw them away.
1363                  */
1364                 case    PPPOE_SINIT:
1365                 case    PPPOE_SREQ:
1366                 case    PPPOE_SOFFER:
1367                 case    PPPOE_SNONE:
1368                 case    PPPOE_LISTENING:
1369                 case    PPPOE_DEAD:
1370                 default:
1371                         LEAVE(ENETUNREACH);
1372                 }
1373         }
1374 quit:
1375         NG_FREE_DATA(m, meta);
1376         return error;
1377 }
1378
1379 /*
1380  * Do local shutdown processing..
1381  * If we are a persistant device, we might refuse to go away, and
1382  * we'd only remove our links and reset ourself.
1383  */
1384 static int
1385 ng_pppoe_rmnode(node_p node)
1386 {
1387         const priv_p privdata = node->private;
1388
1389 AAA
1390         node->flags |= NG_INVALID;
1391         ng_cutlinks(node);
1392         ng_unname(node);
1393         node->private = NULL;
1394         ng_unref(privdata->node);
1395         kfree(privdata, M_NETGRAPH);
1396         return (0);
1397 }
1398
1399 /*
1400  * This is called once we've already connected a new hook to the other node.
1401  * It gives us a chance to balk at the last minute.
1402  */
1403 static int
1404 ng_pppoe_connect(hook_p hook)
1405 {
1406         /* be really amiable and just say "YUP that's OK by me! " */
1407         return (0);
1408 }
1409
1410 /*
1411  * Hook disconnection
1412  *
1413  * Clean up all dangling links and information about the session/hook.
1414  * For this type, removal of the last link destroys the node
1415  */
1416 static int
1417 ng_pppoe_disconnect(hook_p hook)
1418 {
1419         node_p node = hook->node;
1420         priv_p privp = node->private;
1421         sessp   sp;
1422         int     hooks;
1423
1424 AAA
1425         hooks = node->numhooks; /* this one already not counted */
1426         if (hook->private == &privp->debug_hook) {
1427                 privp->debug_hook = NULL;
1428         } else if (hook->private == &privp->ethernet_hook) {
1429                 privp->ethernet_hook = NULL;
1430                 ng_rmnode(node);
1431         } else {
1432                 sp = hook->private;
1433                 if (sp->state != PPPOE_SNONE ) {
1434                         pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1435                 }
1436                 /*
1437                  * According to the spec, if we are connected,
1438                  * we should send a DISC packet if we are shutting down
1439                  * a session.
1440                  */
1441                 if ((privp->ethernet_hook)
1442                 && ((sp->state == PPPOE_CONNECTED)
1443                  || (sp->state == PPPOE_NEWCONNECTED))) {
1444                         struct mbuf *m;
1445                         struct pppoe_full_hdr *wh;
1446                         struct pppoe_tag *tag;
1447                         int     msglen = strlen(SIGNOFF);
1448                         void *dummy = NULL;
1449                         int error = 0;
1450
1451                         /* revert the stored header to DISC/PADT mode */
1452                         wh = &sp->pkt_hdr;
1453                         wh->ph.code = PADT_CODE;
1454                         if (pppoe_mode == PPPOE_NONSTANDARD)
1455                                 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1456                         else
1457                                 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1458
1459                         /* generate a packet of that type */
1460                         MGETHDR(m, MB_DONTWAIT, MT_DATA);
1461                         if(m == NULL)
1462                                 kprintf("pppoe: Session out of mbufs\n");
1463                         else {
1464                                 m->m_pkthdr.rcvif = NULL;
1465                                 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1466                                 bcopy((caddr_t)wh, mtod(m, caddr_t),
1467                                     sizeof(*wh));
1468                                 /*
1469                                  * Add a General error message and adjust
1470                                  * sizes
1471                                  */
1472                                 wh = mtod(m, struct pppoe_full_hdr *);
1473                                 tag = wh->ph.tag;
1474                                 tag->tag_type = PTT_GEN_ERR;
1475                                 tag->tag_len = htons((u_int16_t)msglen);
1476                                 strncpy(tag->tag_data, SIGNOFF, msglen);
1477                                 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1478                                     msglen);
1479                                 wh->ph.length = htons(sizeof(*tag) + msglen);
1480                                 NG_SEND_DATA(error, privp->ethernet_hook, m,
1481                                     dummy);
1482                         }
1483                 }
1484                 /*
1485                  * As long as we have somewhere to store the timeout handle,
1486                  * we may have a timeout pending.. get rid of it.
1487                  */
1488                 if (sp->neg) {
1489                         callout_stop(&sp->neg->timeout_ch);
1490                         if (sp->neg->m)
1491                                 m_freem(sp->neg->m);
1492                         kfree(sp->neg, M_NETGRAPH);
1493                 }
1494                 kfree(sp, M_NETGRAPH);
1495                 hook->private = NULL;
1496                 /* work out how many session hooks there are */
1497                 /* Node goes away on last session hook removal */
1498                 if (privp->ethernet_hook) hooks -= 1;
1499                 if (privp->debug_hook) hooks -= 1;
1500         }
1501         if (node->numhooks == 0)
1502                 ng_rmnode(node);
1503         return (0);
1504 }
1505
1506 /*
1507  * timeouts come here.
1508  */
1509 static void
1510 pppoe_ticker(void *arg)
1511 {
1512         hook_p hook = arg;
1513         sessp   sp = hook->private;
1514         negp    neg = sp->neg;
1515         int     error = 0;
1516         struct mbuf *m0 = NULL;
1517         priv_p privp = hook->node->private;
1518         meta_p dummy = NULL;
1519
1520         crit_enter();
1521 AAA
1522         switch(sp->state) {
1523                 /*
1524                  * resend the last packet, using an exponential backoff.
1525                  * After a period of time, stop growing the backoff,
1526                  * and either leave it, or revert to the start.
1527                  */
1528         case    PPPOE_SINIT:
1529         case    PPPOE_SREQ:
1530                 /* timeouts on these produce resends */
1531                 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1532                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1533                 callout_reset(&neg->timeout_ch, neg->timeout * hz,
1534                                 pppoe_ticker, hook);
1535                 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1536                         if (sp->state == PPPOE_SREQ) {
1537                                 /* revert to SINIT mode */
1538                                 pppoe_start(sp);
1539                         } else {
1540                                 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1541                         }
1542                 }
1543                 break;
1544         case    PPPOE_PRIMED:
1545         case    PPPOE_SOFFER:
1546                 /* a timeout on these says "give up" */
1547                 ng_destroy_hook(hook);
1548                 break;
1549         default:
1550                 /* timeouts have no meaning in other states */
1551                 kprintf("pppoe: unexpected timeout\n");
1552         }
1553         crit_exit();
1554 }
1555
1556
1557 static void
1558 sendpacket(sessp sp)
1559 {
1560         int     error = 0;
1561         struct mbuf *m0 = NULL;
1562         hook_p hook = sp->hook;
1563         negp    neg = sp->neg;
1564         priv_p  privp = hook->node->private;
1565         meta_p dummy = NULL;
1566
1567 AAA
1568         switch(sp->state) {
1569         case    PPPOE_LISTENING:
1570         case    PPPOE_DEAD:
1571         case    PPPOE_SNONE:
1572         case    PPPOE_CONNECTED:
1573                 kprintf("pppoe: sendpacket: unexpected state\n");
1574                 break;
1575
1576         case    PPPOE_NEWCONNECTED:
1577                 /* send the PADS without a timeout - we're now connected */
1578                 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1579                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1580                 break;
1581
1582         case    PPPOE_PRIMED:
1583                 /* No packet to send, but set up the timeout */
1584                 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1585                                 pppoe_ticker, hook);
1586                 break;
1587
1588         case    PPPOE_SOFFER:
1589                 /*
1590                  * send the offer but if they don't respond
1591                  * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1592                  */
1593                 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1594                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1595                 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1596                                 pppoe_ticker, hook);
1597                 break;
1598
1599         case    PPPOE_SINIT:
1600         case    PPPOE_SREQ:
1601                 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1602                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1603                 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz,
1604                                 pppoe_ticker, hook);
1605                 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1606                 break;
1607
1608         default:
1609                 error = EINVAL;
1610                 kprintf("pppoe: timeout: bad state\n");
1611         }
1612         /* return (error); */
1613 }
1614
1615 /*
1616  * Parse an incoming packet to see if any tags should be copied to the
1617  * output packet. Don't do any tags that have been handled in the main
1618  * state machine.
1619  */
1620 static const struct pppoe_tag*
1621 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1622 {
1623         const char *const end = (const char *)next_tag(ph);
1624         const char *ptn;
1625         const struct pppoe_tag *pt = &ph->tag[0];
1626         /*
1627          * Keep processing tags while a tag header will still fit.
1628          */
1629 AAA
1630         while((const char*)(pt + 1) <= end) {
1631                 /*
1632                  * If the tag data would go past the end of the packet, abort.
1633                  */
1634                 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1635                 if(ptn > end)
1636                         return NULL;
1637
1638                 switch (pt->tag_type) {
1639                 case    PTT_RELAY_SID:
1640                         insert_tag(sp, pt);
1641                         break;
1642                 case    PTT_EOL:
1643                         return NULL;
1644                 case    PTT_SRV_NAME:
1645                 case    PTT_AC_NAME:
1646                 case    PTT_HOST_UNIQ:
1647                 case    PTT_AC_COOKIE:
1648                 case    PTT_VENDOR:
1649                 case    PTT_SRV_ERR:
1650                 case    PTT_SYS_ERR:
1651                 case    PTT_GEN_ERR:
1652                         break;
1653                 }
1654                 pt = (const struct pppoe_tag*)ptn;
1655         }
1656         return NULL;
1657 }
1658
1659 static  int
1660 pppoe_send_event(sessp sp, enum cmd cmdid)
1661 {
1662         int error;
1663         struct ng_mesg *msg;
1664         struct ngpppoe_sts *sts;
1665
1666 AAA
1667         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1668                         sizeof(struct ngpppoe_sts), M_NOWAIT);
1669         if (msg == NULL)
1670                 return (ENOMEM);
1671         sts = (struct ngpppoe_sts *)msg->data;
1672         strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ);
1673         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
1674         return (error);
1675 }