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.h>
  61 #include <net/if_var.h>
  62 #include <net/ethernet.h>
  63
  64 #include <netgraph/ng_message.h>
  65 #include <netgraph/netgraph.h>
  66 #include "ng_pppoe.h"
  67
  68 #define SIGNOFF "session closed"
  69
  70 /*
  71  * This section contains the netgraph method declarations for the
  72  * pppoe node. These methods define the netgraph pppoe 'type'.
  73  */
  74
  75 static ng_constructor_t ng_pppoe_constructor;
  76 static ng_rcvmsg_t      ng_pppoe_rcvmsg;
  77 static ng_shutdown_t    ng_pppoe_rmnode;
  78 static ng_newhook_t     ng_pppoe_newhook;
  79 static ng_connect_t     ng_pppoe_connect;
  80 static ng_rcvdata_t     ng_pppoe_rcvdata;
  81 static ng_disconnect_t  ng_pppoe_disconnect;
  82
  83 /* Netgraph node type descriptor */
  84 static struct ng_type typestruct = {
  85         NG_VERSION,
  86         NG_PPPOE_NODE_TYPE,
  87         NULL,
  88         ng_pppoe_constructor,
  89         ng_pppoe_rcvmsg,
  90         ng_pppoe_rmnode,
  91         ng_pppoe_newhook,
  92         NULL,
  93         ng_pppoe_connect,
  94         ng_pppoe_rcvdata,
  95         ng_pppoe_rcvdata,
  96         ng_pppoe_disconnect,
  97         NULL
  98 };
  99 NETGRAPH_INIT(pppoe, &typestruct);
 100
 101 /*
 102  * States for the session state machine.
 103  * These have no meaning if there is no hook attached yet.
 104  */
 105 enum state {
 106     PPPOE_SNONE=0,      /* [both] Initial state */
 107     PPPOE_LISTENING,    /* [Daemon] Listening for discover initiation pkt */
 108     PPPOE_SINIT,        /* [Client] Sent discovery initiation */
 109     PPPOE_PRIMED,       /* [Server] Awaiting PADI from daemon */
 110     PPPOE_SOFFER,       /* [Server] Sent offer message  (got PADI)*/
 111     PPPOE_SREQ,         /* [Client] Sent a Request */
 112     PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
 113     PPPOE_CONNECTED,    /* [Both] Connection established, Data received */
 114     PPPOE_DEAD          /* [Both] */
 115 };
 116
 117 #define NUMTAGS 20 /* number of tags we are set up to work with */
 118
 119 /*
 120  * Information we store for each hook on each node for negotiating the
 121  * session. The mbuf and cluster are freed once negotiation has completed.
 122  * The whole negotiation block is then discarded.
 123  */
 124
 125 struct sess_neg {
 126         struct mbuf             *m; /* holds cluster with last sent packet */
 127         union   packet          *pkt; /* points within the above cluster */
 128         struct callout          timeout_ch;
 129         u_int                   timeout; /* 0,1,2,4,8,16 etc. seconds */
 130         u_int                   numtags;
 131         const struct pppoe_tag  *tags[NUMTAGS];
 132         u_int                   service_len;
 133         u_int                   ac_name_len;
 134
 135         struct datatag          service;
 136         struct datatag          ac_name;
 137 };
 138 typedef struct sess_neg *negp;
 139
 140 /*
 141  * Session information that is needed after connection.
 142  */
 143 struct sess_con {
 144         hook_p                  hook;
 145         u_int16_t               Session_ID;
 146         enum state              state;
 147         char                    creator[NG_NODESIZ]; /* who to notify */
 148         struct pppoe_full_hdr   pkt_hdr;        /* used when connected */
 149         negp                    neg;            /* used when negotiating */
 150         /*struct sess_con       *hash_next;*/   /* not yet used */
 151 };
 152 typedef struct sess_con *sessp;
 153
 154 /*
 155  * Information we store for each node
 156  */
 157 struct PPPOE {
 158         node_p          node;           /* back pointer to node */
 159         hook_p          ethernet_hook;
 160         hook_p          debug_hook;
 161         u_int           packets_in;     /* packets in from ethernet */
 162         u_int           packets_out;    /* packets out towards ethernet */
 163         u_int32_t       flags;
 164         /*struct sess_con *buckets[HASH_SIZE];*/        /* not yet used */
 165 };
 166 typedef struct PPPOE *priv_p;
 167
 168 struct ether_header eh_prototype =
 169         {{0xff,0xff,0xff,0xff,0xff,0xff},
 170          {0x00,0x00,0x00,0x00,0x00,0x00},
 171          ETHERTYPE_PPPOE_DISC};
 172
 173 #define PPPOE_KEEPSTANDARD      -1      /* never switch to nonstandard mode */
 174 #define PPPOE_STANDARD          0       /* try standard mode (dangerous!) */
 175 #define PPPOE_NONSTANDARD       1       /* just be in nonstandard mode */
 176 static int pppoe_mode = PPPOE_KEEPSTANDARD;
 177
 178 static int
 179 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
 180 {
 181         int error;
 182         int val;
 183
 184         val = pppoe_mode;
 185         error = sysctl_handle_int(oidp, &val, 0, req);
 186         if (error != 0 || req->newptr == NULL)
 187                 return (error);
 188         switch (val) {
 189         case PPPOE_NONSTANDARD:
 190                 pppoe_mode = PPPOE_NONSTANDARD;
 191                 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
 192                 break;
 193         case PPPOE_STANDARD:
 194                 pppoe_mode = PPPOE_STANDARD;
 195                 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
 196                 break;
 197         case PPPOE_KEEPSTANDARD:
 198                 pppoe_mode = PPPOE_KEEPSTANDARD;
 199                 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
 200                 break;
 201         default:
 202                 return (EINVAL);
 203         }
 204         return (0);
 205 }
 206
 207 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
 208     0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype");
 209
 210 union uniq {
 211         char bytes[sizeof(void *)];
 212         void * pointer;
 213         };
 214
 215 #define LEAVE(x) do { error = x; goto quit; } while(0)
 216 static void     pppoe_start(sessp sp);
 217 static void     sendpacket(sessp sp);
 218 static void     pppoe_ticker(void *arg);
 219 static const    struct pppoe_tag *scan_tags(sessp sp,
 220                         const struct pppoe_hdr* ph);
 221 static  int     pppoe_send_event(sessp sp, enum cmd cmdid);
 222
 223 /*************************************************************************
 224  * Some basic utilities  from the Linux version with author's permission.*
 225  * Author:      Michal Ostrowski <mostrows@styx.uwaterloo.ca>            *
 226  ************************************************************************/
 227
 228 /*
 229  * Generate a new session id
 230  * XXX find out the FreeBSD locking scheme.
 231  */
 232 static u_int16_t
 233 get_new_sid(node_p node)
 234 {
 235         static int pppoe_sid = 10;
 236         sessp sp;
 237         hook_p  hook;
 238         u_int16_t val;
 239         priv_p privp = node->private;
 240
 241 AAA
 242 restart:
 243         val = pppoe_sid++;
 244         /*
 245          * Spec says 0xFFFF is reserved.
 246          * Also don't use 0x0000
 247          */
 248         if (val == 0xffff) {
 249                 pppoe_sid = 20;
 250                 goto restart;
 251         }
 252
 253         /* Check it isn't already in use */
 254         LIST_FOREACH(hook, &node->hooks, hooks) {
 255                 /* don't check special hooks */
 256                 if ((hook->private == &privp->debug_hook)
 257                 ||  (hook->private == &privp->ethernet_hook))
 258                         continue;
 259                 sp = hook->private;
 260                 if (sp->Session_ID == val)
 261                         goto restart;
 262         }
 263
 264         return val;
 265 }
 266
 267
 268 /*
 269  * Return the location where the next tag can be put
 270  */
 271 static __inline const struct pppoe_tag*
 272 next_tag(const struct pppoe_hdr* ph)
 273 {
 274         return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
 275             + ntohs(ph->length));
 276 }
 277
 278 /*
 279  * Look for a tag of a specific type
 280  * Don't trust any length the other end says.
 281  * but assume we already sanity checked ph->length.
 282  */
 283 static const struct pppoe_tag*
 284 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
 285 {
 286         const char *const end = (const char *)next_tag(ph);
 287         const char *ptn;
 288         const struct pppoe_tag *pt = &ph->tag[0];
 289         /*
 290          * Keep processing tags while a tag header will still fit.
 291          */
 292 AAA
 293         while((const char*)(pt + 1) <= end) {
 294             /*
 295              * If the tag data would go past the end of the packet, abort.
 296              */
 297             ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
 298             if(ptn > end)
 299                 return NULL;
 300
 301             if(pt->tag_type == idx)
 302                 return pt;
 303
 304             pt = (const struct pppoe_tag*)ptn;
 305         }
 306         return NULL;
 307 }
 308
 309 /**************************************************************************
 310  * inlines to initialise or add tags to a session's tag list,
 311  **************************************************************************/
 312 /*
 313  * Initialise the session's tag list
 314  */
 315 static void
 316 init_tags(sessp sp)
 317 {
 318 AAA
 319         if(sp->neg == NULL) {
 320                 kprintf("pppoe: asked to init NULL neg pointer\n");
 321                 return;
 322         }
 323         sp->neg->numtags = 0;
 324 }
 325
 326 static void
 327 insert_tag(sessp sp, const struct pppoe_tag *tp)
 328 {
 329         int     i;
 330         negp neg;
 331
 332 AAA
 333         if((neg = sp->neg) == NULL) {
 334                 kprintf("pppoe: asked to use NULL neg pointer\n");
 335                 return;
 336         }
 337         if ((i = neg->numtags++) < NUMTAGS) {
 338                 neg->tags[i] = tp;
 339         } else {
 340                 kprintf("pppoe: asked to add too many tags to packet\n");
 341                 neg->numtags--;
 342         }
 343 }
 344
 345 /*
 346  * Make up a packet, using the tags filled out for the session.
 347  *
 348  * Assume that the actual pppoe header and ethernet header
 349  * are filled out externally to this routine.
 350  * Also assume that neg->wh points to the correct
 351  * location at the front of the buffer space.
 352  */
 353 static void
 354 make_packet(sessp sp) {
 355         struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
 356         const struct pppoe_tag **tag;
 357         char *dp;
 358         int count;
 359         int tlen;
 360         u_int16_t length = 0;
 361
 362 AAA
 363         if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
 364                 kprintf("pppoe: make_packet called from wrong state\n");
 365         }
 366         dp = (char *)wh->ph.tag;
 367         for (count = 0, tag = sp->neg->tags;
 368             ((count < sp->neg->numtags) && (count < NUMTAGS));
 369             tag++, count++) {
 370                 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
 371                 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
 372                         kprintf("pppoe: tags too long\n");
 373                         sp->neg->numtags = count;
 374                         break;  /* XXX chop off what's too long */
 375                 }
 376                 bcopy(*tag, dp, tlen);
 377                 length += tlen;
 378                 dp += tlen;
 379         }
 380         wh->ph.length = htons(length);
 381         sp->neg->m->m_len = length + sizeof(*wh);
 382         sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
 383 }
 384
 385 /**************************************************************************
 386  * Routine to match a service offered                                     *
 387  **************************************************************************/
 388 /*
 389  * Find a hook that has a service string that matches that
 390  * we are seeking. for now use a simple string.
 391  * In the future we may need something like regexp().
 392  * for testing allow a null string to match 1st found and a null service
 393  * to match all requests. Also make '*' do the same.
 394  */
 395
 396 #define NG_MATCH_EXACT  1
 397 #define NG_MATCH_ANY    2
 398
 399 static hook_p
 400 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
 401 {
 402         sessp   sp      = NULL;
 403         negp    neg     = NULL;
 404         priv_p  privp   = node->private;
 405         hook_p  allhook = NULL;
 406         hook_p  hook;
 407
 408 AAA
 409         LIST_FOREACH(hook, &node->hooks, hooks) {
 410
 411                 /* skip any hook that is debug or ethernet */
 412                 if ((hook->private == &privp->debug_hook)
 413                 ||  (hook->private == &privp->ethernet_hook))
 414                         continue;
 415                 sp = hook->private;
 416
 417                 /* Skip any sessions which are not in LISTEN mode. */
 418                 if ( sp->state != PPPOE_LISTENING)
 419                         continue;
 420
 421                 neg = sp->neg;
 422
 423                 /* Special case for a blank or "*" service name (wildcard) */
 424                 if (match == NG_MATCH_ANY && neg->service_len == 1 &&
 425                     neg->service.data[0] == '*') {
 426                         allhook = hook;
 427                         continue;
 428                 }
 429
 430                 /* If the lengths don't match, that aint it. */
 431                 if (neg->service_len != svc_len)
 432                         continue;
 433
 434                 /* An exact match? */
 435                 if (svc_len == 0)
 436                         break;
 437
 438                 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
 439                         break;
 440         }
 441         return (hook ? hook : allhook);
 442 }
 443 /**************************************************************************
 444  * Routine to find a particular session that matches an incoming packet   *
 445  **************************************************************************/
 446 static hook_p
 447 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
 448 {
 449         sessp   sp = NULL;
 450         hook_p hook = NULL;
 451         priv_p  privp = node->private;
 452         u_int16_t       session = ntohs(wh->ph.sid);
 453
 454         /*
 455          * find matching peer/session combination.
 456          */
 457 AAA
 458         LIST_FOREACH(hook, &node->hooks, hooks) {
 459                 /* don't check special hooks */
 460                 if ((hook->private == &privp->debug_hook)
 461                 ||  (hook->private == &privp->ethernet_hook)) {
 462                         continue;
 463                 }
 464                 sp = hook->private;
 465                 if ( ( (sp->state == PPPOE_CONNECTED)
 466                     || (sp->state == PPPOE_NEWCONNECTED) )
 467                 && (sp->Session_ID == session)
 468                 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
 469                     wh->eh.ether_shost,
 470                     ETHER_ADDR_LEN)) == 0) {
 471                         break;
 472                 }
 473         }
 474         return (hook);
 475 }
 476
 477 static hook_p
 478 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
 479 {
 480         hook_p hook = NULL;
 481         priv_p  privp = node->private;
 482         union uniq              uniq;
 483
 484 AAA
 485         bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
 486         /* cycle through all known hooks */
 487         LIST_FOREACH(hook, &node->hooks, hooks) {
 488                 /* don't check special hooks */
 489                 if ((hook->private == &privp->debug_hook)
 490                 ||  (hook->private == &privp->ethernet_hook))
 491                         continue;
 492                 if (uniq.pointer == hook->private)
 493                         break;
 494         }
 495         return (hook);
 496 }
 497
 498 /**************************************************************************
 499  * start of Netgraph entrypoints                                          *
 500  **************************************************************************/
 501
 502 /*
 503  * Allocate the private data structure and the generic node
 504  * and link them together.
 505  *
 506  * ng_make_node_common() returns with a generic node struct
 507  * with a single reference for us.. we transfer it to the
 508  * private structure.. when we free the private struct we must
 509  * unref the node so it gets freed too.
 510  */
 511 static int
 512 ng_pppoe_constructor(node_p *nodep)
 513 {
 514         priv_p privdata;
 515         int error;
 516
 517 AAA
 518         /* Initialize private descriptor */
 519         privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO);
 520         if (privdata == NULL)
 521                 return (ENOMEM);
 522
 523         /* Call the 'generic' (ie, superclass) node constructor */
 524         if ((error = ng_make_node_common(&typestruct, nodep))) {
 525                 kfree(privdata, M_NETGRAPH);
 526                 return (error);
 527         }
 528
 529         /* Link structs together; this counts as our one reference to *nodep */
 530         (*nodep)->private = privdata;
 531         privdata->node = *nodep;
 532         return (0);
 533 }
 534
 535 /*
 536  * Give our ok for a hook to be added...
 537  * point the hook's private info to the hook structure.
 538  *
 539  * The following hook names are special:
 540  *  Ethernet:  the hook that should be connected to a NIC.
 541  *  debug:      copies of data sent out here  (when I write the code).
 542  * All other hook names need only be unique. (the framework checks this).
 543  */
 544 static int
 545 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
 546 {
 547         const priv_p privp = node->private;
 548         sessp sp;
 549
 550 AAA
 551         if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
 552                 privp->ethernet_hook = hook;
 553                 hook->private = &privp->ethernet_hook;
 554         } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
 555                 privp->debug_hook = hook;
 556                 hook->private = &privp->debug_hook;
 557         } else {
 558                 /*
 559                  * Any other unique name is OK.
 560                  * The infrastructure has already checked that it's unique,
 561                  * so just allocate it and hook it in.
 562                  */
 563                 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO);
 564                 if (sp == NULL)
 565                         return (ENOMEM);
 566
 567                 hook->private = sp;
 568                 sp->hook = hook;
 569         }
 570         return(0);
 571 }
 572
 573 /*
 574  * Get a netgraph control message.
 575  * Check it is one we understand. If needed, send a response.
 576  * We sometimes save the address for an async action later.
 577  * Always free the message.
 578  */
 579 static int
 580 ng_pppoe_rcvmsg(node_p node,
 581            struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
 582 {
 583         priv_p privp = node->private;
 584         struct ngpppoe_init_data *ourmsg = NULL;
 585         struct ng_mesg *resp = NULL;
 586         int error = 0;
 587         hook_p hook = NULL;
 588         sessp sp = NULL;
 589         negp neg = NULL;
 590
 591 AAA
 592         /* Deal with message according to cookie and command */
 593         switch (msg->header.typecookie) {
 594         case NGM_PPPOE_COOKIE:
 595                 switch (msg->header.cmd) {
 596                 case NGM_PPPOE_CONNECT:
 597                 case NGM_PPPOE_LISTEN:
 598                 case NGM_PPPOE_OFFER:
 599                 case NGM_PPPOE_SERVICE:
 600                         ourmsg = (struct ngpppoe_init_data *)msg->data;
 601                         if (( sizeof(*ourmsg) > msg->header.arglen)
 602                         || ((sizeof(*ourmsg) + ourmsg->data_len)
 603                             > msg->header.arglen)) {
 604                                 kprintf("pppoe_rcvmsg: bad arg size");
 605                                 LEAVE(EMSGSIZE);
 606                         }
 607                         if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) {
 608                                 kprintf("pppoe: init data too long (%d)\n",
 609                                                         ourmsg->data_len);
 610                                 LEAVE(EMSGSIZE);
 611                         }
 612                         /* make sure strcmp will terminate safely */
 613                         ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
 614
 615                         /* cycle through all known hooks */
 616                         LIST_FOREACH(hook, &node->hooks, hooks) {
 617                                 if (hook->name
 618                                 && strcmp(hook->name, ourmsg->hook) == 0)
 619                                         break;
 620                         }
 621                         if (hook == NULL) {
 622                                 LEAVE(ENOENT);
 623                         }
 624                         if ((hook->private == &privp->debug_hook)
 625                         ||  (hook->private == &privp->ethernet_hook)) {
 626                                 LEAVE(EINVAL);
 627                         }
 628                         sp = hook->private;
 629
 630                         if (msg->header.cmd == NGM_PPPOE_LISTEN) {
 631                                 /*
 632                                  * Ensure we aren't already listening for this
 633                                  * service.
 634                                  */
 635                                 if (pppoe_match_svc(node, ourmsg->data,
 636                                     ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
 637                                         LEAVE(EEXIST);
 638                                 }
 639                         }
 640
 641                         /*
 642                          * PPPOE_SERVICE advertisments are set up
 643                          * on sessions that are in PRIMED state.
 644                          */
 645                         if (msg->header.cmd == NGM_PPPOE_SERVICE) {
 646                                 break;
 647                         }
 648                         if (sp->state != PPPOE_SNONE) {
 649                                 kprintf("pppoe: Session already active\n");
 650                                 LEAVE(EISCONN);
 651                         }
 652
 653                         /*
 654                          * set up prototype header
 655                          */
 656                         neg = kmalloc(sizeof(*neg), M_NETGRAPH,
 657                                       M_NOWAIT | M_ZERO);
 658
 659                         if (neg == NULL) {
 660                                 kprintf("pppoe: Session out of memory\n");
 661                                 LEAVE(ENOMEM);
 662                         }
 663                         MGETHDR(neg->m, M_NOWAIT, MT_DATA);
 664                         if(neg->m == NULL) {
 665                                 kprintf("pppoe: Session out of mbufs\n");
 666                                 kfree(neg, M_NETGRAPH);
 667                                 LEAVE(ENOBUFS);
 668                         }
 669                         neg->m->m_pkthdr.rcvif = NULL;
 670                         MCLGET(neg->m, M_NOWAIT);
 671                         if ((neg->m->m_flags & M_EXT) == 0) {
 672                                 kprintf("pppoe: Session out of mcls\n");
 673                                 m_freem(neg->m);
 674                                 kfree(neg, M_NETGRAPH);
 675                                 LEAVE(ENOBUFS);
 676                         }
 677                         sp->neg = neg;
 678                         callout_init(&neg->timeout_ch);
 679                         neg->m->m_len = sizeof(struct pppoe_full_hdr);
 680                         neg->pkt = mtod(neg->m, union packet*);
 681                         neg->pkt->pkt_header.eh = eh_prototype;
 682                         neg->pkt->pkt_header.ph.ver = 0x1;
 683                         neg->pkt->pkt_header.ph.type = 0x1;
 684                         neg->pkt->pkt_header.ph.sid = 0x0000;
 685                         neg->timeout = 0;
 686
 687                         strlcpy(sp->creator, retaddr, NG_NODESIZ);
 688                 }
 689                 switch (msg->header.cmd) {
 690                 case NGM_PPPOE_GET_STATUS:
 691                     {
 692                         struct ngpppoestat *stats;
 693
 694                         NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
 695                         if (!resp) {
 696                                 LEAVE(ENOMEM);
 697                         }
 698                         stats = (struct ngpppoestat *) resp->data;
 699                         stats->packets_in = privp->packets_in;
 700                         stats->packets_out = privp->packets_out;
 701                         break;
 702                     }
 703                 case NGM_PPPOE_CONNECT:
 704                         /*
 705                          * Check the hook exists and is Uninitialised.
 706                          * Send a PADI request, and start the timeout logic.
 707                          * Store the originator of this message so we can send
 708                          * a success of fail message to them later.
 709                          * Move the session to SINIT
 710                          * Set up the session to the correct state and
 711                          * start it.
 712                          */
 713                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 714                         neg->service.hdr.tag_len =
 715                                         htons((u_int16_t)ourmsg->data_len);
 716                         if (ourmsg->data_len) {
 717                                 bcopy(ourmsg->data,
 718                                         neg->service.data, ourmsg->data_len);
 719                         }
 720                         neg->service_len = ourmsg->data_len;
 721                         pppoe_start(sp);
 722                         break;
 723                 case NGM_PPPOE_LISTEN:
 724                         /*
 725                          * Check the hook exists and is Uninitialised.
 726                          * Install the service matching string.
 727                          * Store the originator of this message so we can send
 728                          * a success of fail message to them later.
 729                          * Move the hook to 'LISTENING'
 730                          */
 731                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 732                         neg->service.hdr.tag_len =
 733                                         htons((u_int16_t)ourmsg->data_len);
 734
 735                         if (ourmsg->data_len) {
 736                                 bcopy(ourmsg->data,
 737                                         neg->service.data, ourmsg->data_len);
 738                         }
 739                         neg->service_len = ourmsg->data_len;
 740                         neg->pkt->pkt_header.ph.code = PADT_CODE;
 741                         /*
 742                          * wait for PADI packet coming from ethernet
 743                          */
 744                         sp->state = PPPOE_LISTENING;
 745                         break;
 746                 case NGM_PPPOE_OFFER:
 747                         /*
 748                          * Check the hook exists and is Uninitialised.
 749                          * Store the originator of this message so we can send
 750                          * a success of fail message to them later.
 751                          * Store the AC-Name given and go to PRIMED.
 752                          */
 753                         neg->ac_name.hdr.tag_type = PTT_AC_NAME;
 754                         neg->ac_name.hdr.tag_len =
 755                                         htons((u_int16_t)ourmsg->data_len);
 756                         if (ourmsg->data_len) {
 757                                 bcopy(ourmsg->data,
 758                                         neg->ac_name.data, ourmsg->data_len);
 759                         }
 760                         neg->ac_name_len = ourmsg->data_len;
 761                         neg->pkt->pkt_header.ph.code = PADO_CODE;
 762                         /*
 763                          * Wait for PADI packet coming from hook
 764                          */
 765                         sp->state = PPPOE_PRIMED;
 766                         break;
 767                 case NGM_PPPOE_SERVICE:
 768                         /*
 769                          * Check the session is primed.
 770                          * for now just allow ONE service to be advertised.
 771                          * If you do it twice you just overwrite.
 772                          */
 773                         if (sp->state != PPPOE_PRIMED) {
 774                                 kprintf("pppoe: Session not primed\n");
 775                                 LEAVE(EISCONN);
 776                         }
 777                         neg = sp->neg;
 778                         neg->service.hdr.tag_type = PTT_SRV_NAME;
 779                         neg->service.hdr.tag_len =
 780                             htons((u_int16_t)ourmsg->data_len);
 781
 782                         if (ourmsg->data_len)
 783                                 bcopy(ourmsg->data, neg->service.data,
 784                                     ourmsg->data_len);
 785                         neg->service_len = ourmsg->data_len;
 786                         break;
 787                 default:
 788                         LEAVE(EINVAL);
 789                 }
 790                 break;
 791         default:
 792                 LEAVE(EINVAL);
 793         }
 794
 795         /* Take care of synchronous response, if any */
 796         if (rptr)
 797                 *rptr = resp;
 798         else if (resp)
 799                 kfree(resp, M_NETGRAPH);
 800
 801         /* Free the message and return */
 802 quit:
 803         kfree(msg, M_NETGRAPH);
 804         return(error);
 805 }
 806
 807 /*
 808  * Start a client into the first state. A separate function because
 809  * it can be needed if the negotiation times out.
 810  */
 811 static void
 812 pppoe_start(sessp sp)
 813 {
 814         struct {
 815                 struct pppoe_tag hdr;
 816                 union   uniq    data;
 817         } __attribute ((packed)) uniqtag;
 818
 819         /*
 820          * kick the state machine into starting up
 821          */
 822 AAA
 823         sp->state = PPPOE_SINIT;
 824         /* reset the packet header to broadcast */
 825         sp->neg->pkt->pkt_header.eh = eh_prototype;
 826         sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
 827         uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
 828         uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
 829         uniqtag.data.pointer = sp;
 830         init_tags(sp);
 831         insert_tag(sp, &uniqtag.hdr);
 832         insert_tag(sp, &sp->neg->service.hdr);
 833         make_packet(sp);
 834         sendpacket(sp);
 835 }
 836
 837 static int
 838 send_acname(sessp sp, const struct pppoe_tag *tag)
 839 {
 840         int error, tlen;
 841         struct ng_mesg *msg;
 842         struct ngpppoe_sts *sts;
 843
 844         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
 845             sizeof(struct ngpppoe_sts), M_NOWAIT);
 846         if (msg == NULL)
 847                 return (ENOMEM);
 848
 849         sts = (struct ngpppoe_sts *)msg->data;
 850         tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
 851         strncpy(sts->hook, tag->tag_data, tlen);
 852         sts->hook[tlen] = '\0';
 853         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
 854
 855         return (error);
 856 }
 857
 858 static int
 859 send_sessionid(sessp sp)
 860 {
 861         int error;
 862         struct ng_mesg *msg;
 863
 864         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
 865             sizeof(u_int16_t), M_NOWAIT);
 866         if (msg == NULL)
 867                 return (ENOMEM);
 868
 869         *(u_int16_t *)msg->data = sp->Session_ID;
 870         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
 871
 872         return (error);
 873 }
 874
 875 /*
 876  * Receive data, and do something with it.
 877  * The caller will never free m or meta, so
 878  * if we use up this data or abort we must free BOTH of these.
 879  */
 880 static int
 881 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 882 {
 883         node_p                  node = hook->node;
 884         const priv_p            privp = node->private;
 885         sessp                   sp = hook->private;
 886         const struct pppoe_full_hdr *wh;
 887         const struct pppoe_hdr  *ph;
 888         int                     error = 0;
 889         u_int16_t               length;
 890         u_int8_t                code;
 891         const struct pppoe_tag  *utag = NULL, *tag = NULL;
 892         hook_p                  sendhook;
 893         struct {
 894                 struct pppoe_tag hdr;
 895                 union   uniq    data;
 896         } __attribute ((packed)) uniqtag;
 897         negp                    neg = NULL;
 898         char ethstr[ETHER_ADDRSTRLEN + 1];
 899
 900 AAA
 901         if (hook->private == &privp->debug_hook) {
 902                 /*
 903                  * Data from the debug hook gets sent without modification
 904                  * straight to the ethernet.
 905                  */
 906                 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
 907                 privp->packets_out++;
 908         } else if (hook->private == &privp->ethernet_hook) {
 909                 /*
 910                  * Incoming data.
 911                  * Dig out various fields from the packet.
 912                  * use them to decide where to send it.
 913                  */
 914
 915                 privp->packets_in++;
 916                 if( m->m_len < sizeof(*wh)) {
 917                         m = m_pullup(m, sizeof(*wh)); /* Checks length */
 918                         if (m == NULL) {
 919                                 kprintf("couldn't m_pullup\n");
 920                                 LEAVE(ENOBUFS);
 921                         }
 922                 }
 923                 wh = mtod(m, struct pppoe_full_hdr *);
 924                 ph = &wh->ph;
 925                 length = ntohs(wh->ph.length);
 926                 code = wh->ph.code;
 927                 switch(wh->eh.ether_type) {
 928                 case    ETHERTYPE_PPPOE_STUPID_DISC:
 929                         if (pppoe_mode == PPPOE_STANDARD) {
 930                                 pppoe_mode = PPPOE_NONSTANDARD;
 931                                 eh_prototype.ether_type =
 932                                     ETHERTYPE_PPPOE_STUPID_DISC;
 933                                 log(LOG_NOTICE,
 934                                     "Switched to nonstandard PPPoE mode due to "
 935                                     "packet from %s\n",
 936                                     kether_ntoa(wh->eh.ether_shost, ethstr));
 937                         } else if (pppoe_mode == PPPOE_KEEPSTANDARD)
 938                                 log(LOG_NOTICE,
 939                                     "Ignored nonstandard PPPoE packet "
 940                                     "from %s\n",
 941                                     kether_ntoa(wh->eh.ether_shost, ethstr));
 942                         /* fall through */
 943                 case    ETHERTYPE_PPPOE_DISC:
 944                         /*
 945                          * We need to try to make sure that the tag area
 946                          * is contiguous, or we could wander off the end
 947                          * of a buffer and make a mess.
 948                          * (Linux wouldn't have this problem).
 949                          */
 950 /*XXX fix this mess */
 951
 952                         if (m->m_pkthdr.len <= MHLEN) {
 953                                 if( m->m_len < m->m_pkthdr.len) {
 954                                         m = m_pullup(m, m->m_pkthdr.len);
 955                                         if (m == NULL) {
 956                                                 kprintf("couldn't m_pullup\n");
 957                                                 LEAVE(ENOBUFS);
 958                                         }
 959                                 }
 960                         }
 961                         if (m->m_len != m->m_pkthdr.len) {
 962                                 /*
 963                                  * It's not all in one piece.
 964                                  * We need to do extra work.
 965                                  */
 966                                 kprintf("packet fragmented\n");
 967                                 LEAVE(EMSGSIZE);
 968                         }
 969
 970                         switch(code) {
 971                         case    PADI_CODE:
 972                                 /*
 973                                  * We are a server:
 974                                  * Look for a hook with the required service
 975                                  * and send the ENTIRE packet up there.
 976                                  * It should come back to a new hook in
 977                                  * PRIMED state. Look there for further
 978                                  * processing.
 979                                  */
 980                                 tag = get_tag(ph, PTT_SRV_NAME);
 981                                 if (tag == NULL) {
 982                                         kprintf("no service tag\n");
 983                                         LEAVE(ENETUNREACH);
 984                                 }
 985                                 sendhook = pppoe_match_svc(hook->node,
 986                                         tag->tag_data, ntohs(tag->tag_len),
 987                                         NG_MATCH_ANY);
 988                                 if (sendhook) {
 989                                         NG_SEND_DATA(error, sendhook, m, meta);
 990                                 } else {
 991                                         LEAVE(ENETUNREACH);
 992                                 }
 993                                 break;
 994                         case    PADO_CODE:
 995                                 /*
 996                                  * We are a client:
 997                                  * Use the host_uniq tag to find the
 998                                  * hook this is in response to.
 999                                  * Received #2, now send #3
1000                                  * For now simply accept the first we receive.
1001                                  */
1002                                 utag = get_tag(ph, PTT_HOST_UNIQ);
1003                                 if ((utag == NULL)
1004                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1005                                         kprintf("no host unique field\n");
1006                                         LEAVE(ENETUNREACH);
1007                                 }
1008
1009                                 sendhook = pppoe_finduniq(node, utag);
1010                                 if (sendhook == NULL) {
1011                                         kprintf("no matching session\n");
1012                                         LEAVE(ENETUNREACH);
1013                                 }
1014
1015                                 /*
1016                                  * Check the session is in the right state.
1017                                  * It needs to be in PPPOE_SINIT.
1018                                  */
1019                                 sp = sendhook->private;
1020                                 if (sp->state != PPPOE_SINIT) {
1021                                         kprintf("session in wrong state\n");
1022                                         LEAVE(ENETUNREACH);
1023                                 }
1024                                 neg = sp->neg;
1025                                 callout_stop(&neg->timeout_ch);
1026
1027                                 /*
1028                                  * This is the first time we hear
1029                                  * from the server, so note it's
1030                                  * unicast address, replacing the
1031                                  * broadcast address .
1032                                  */
1033                                 bcopy(wh->eh.ether_shost,
1034                                         neg->pkt->pkt_header.eh.ether_dhost,
1035                                         ETHER_ADDR_LEN);
1036                                 neg->timeout = 0;
1037                                 neg->pkt->pkt_header.ph.code = PADR_CODE;
1038                                 init_tags(sp);
1039                                 insert_tag(sp, utag);      /* Host Unique */
1040                                 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1041                                         insert_tag(sp, tag); /* return cookie */
1042                                 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1043                                         insert_tag(sp, tag); /* return it */
1044                                         send_acname(sp, tag);
1045                                 }
1046                                 insert_tag(sp, &neg->service.hdr); /* Service */
1047                                 scan_tags(sp, ph);
1048                                 make_packet(sp);
1049                                 sp->state = PPPOE_SREQ;
1050                                 sendpacket(sp);
1051                                 break;
1052                         case    PADR_CODE:
1053
1054                                 /*
1055                                  * We are a server:
1056                                  * Use the ac_cookie tag to find the
1057                                  * hook this is in response to.
1058                                  */
1059                                 utag = get_tag(ph, PTT_AC_COOKIE);
1060                                 if ((utag == NULL)
1061                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1062                                         LEAVE(ENETUNREACH);
1063                                 }
1064
1065                                 sendhook = pppoe_finduniq(node, utag);
1066                                 if (sendhook == NULL) {
1067                                         LEAVE(ENETUNREACH);
1068                                 }
1069
1070                                 /*
1071                                  * Check the session is in the right state.
1072                                  * It needs to be in PPPOE_SOFFER
1073                                  * or PPPOE_NEWCONNECTED. If the latter,
1074                                  * then this is a retry by the client.
1075                                  * so be nice, and resend.
1076                                  */
1077                                 sp = sendhook->private;
1078                                 if (sp->state == PPPOE_NEWCONNECTED) {
1079                                         /*
1080                                          * Whoa! drop back to resend that
1081                                          * PADS packet.
1082                                          * We should still have a copy of it.
1083                                          */
1084                                         sp->state = PPPOE_SOFFER;
1085                                 }
1086                                 if (sp->state != PPPOE_SOFFER) {
1087                                         LEAVE (ENETUNREACH);
1088                                         break;
1089                                 }
1090                                 neg = sp->neg;
1091                                 callout_stop(&neg->timeout_ch);
1092                                 neg->pkt->pkt_header.ph.code = PADS_CODE;
1093                                 if (sp->Session_ID == 0)
1094                                         neg->pkt->pkt_header.ph.sid =
1095                                             htons(sp->Session_ID
1096                                                 = get_new_sid(node));
1097                                 send_sessionid(sp);
1098                                 neg->timeout = 0;
1099                                 /*
1100                                  * start working out the tags to respond with.
1101                                  */
1102                                 init_tags(sp);
1103                                 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1104                                 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1105                                         insert_tag(sp, tag);/* return service */
1106                                 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1107                                         insert_tag(sp, tag); /* return it */
1108                                 insert_tag(sp, utag);   /* ac_cookie */
1109                                 scan_tags(sp, ph);
1110                                 make_packet(sp);
1111                                 sp->state = PPPOE_NEWCONNECTED;
1112                                 sendpacket(sp);
1113                                 /*
1114                                  * Having sent the last Negotiation header,
1115                                  * Set up the stored packet header to
1116                                  * be correct for the actual session.
1117                                  * But keep the negotialtion stuff
1118                                  * around in case we need to resend this last
1119                                  * packet. We'll discard it when we move
1120                                  * from NEWCONNECTED to CONNECTED
1121                                  */
1122                                 sp->pkt_hdr = neg->pkt->pkt_header;
1123                                 if (pppoe_mode == PPPOE_NONSTANDARD)
1124                                         sp->pkt_hdr.eh.ether_type
1125                                                 = ETHERTYPE_PPPOE_STUPID_SESS;
1126                                 else
1127                                         sp->pkt_hdr.eh.ether_type
1128                                                 = ETHERTYPE_PPPOE_SESS;
1129                                 sp->pkt_hdr.ph.code = 0;
1130                                 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1131                                 break;
1132                         case    PADS_CODE:
1133                                 /*
1134                                  * We are a client:
1135                                  * Use the host_uniq tag to find the
1136                                  * hook this is in response to.
1137                                  * take the session ID and store it away.
1138                                  * Also make sure the pre-made header is
1139                                  * correct and set us into Session mode.
1140                                  */
1141                                 utag = get_tag(ph, PTT_HOST_UNIQ);
1142                                 if ((utag == NULL)
1143                                 || (ntohs(utag->tag_len) != sizeof(sp))) {
1144                                         LEAVE (ENETUNREACH);
1145                                         break;
1146                                 }
1147                                 sendhook = pppoe_finduniq(node, utag);
1148                                 if (sendhook == NULL) {
1149                                         LEAVE(ENETUNREACH);
1150                                 }
1151
1152                                 /*
1153                                  * Check the session is in the right state.
1154                                  * It needs to be in PPPOE_SREQ.
1155                                  */
1156                                 sp = sendhook->private;
1157                                 if (sp->state != PPPOE_SREQ) {
1158                                         LEAVE(ENETUNREACH);
1159                                 }
1160                                 neg = sp->neg;
1161                                 callout_stop(&neg->timeout_ch);
1162                                 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1163                                 sp->Session_ID = ntohs(wh->ph.sid);
1164                                 send_sessionid(sp);
1165                                 neg->timeout = 0;
1166                                 sp->state = PPPOE_CONNECTED;
1167                                 /*
1168                                  * Now we have gone to Connected mode,
1169                                  * Free all resources needed for
1170                                  * negotiation.
1171                                  * Keep a copy of the header we will be using.
1172                                  */
1173                                 sp->pkt_hdr = neg->pkt->pkt_header;
1174                                 if (pppoe_mode == PPPOE_NONSTANDARD)
1175                                         sp->pkt_hdr.eh.ether_type
1176                                                 = ETHERTYPE_PPPOE_STUPID_SESS;
1177                                 else
1178                                         sp->pkt_hdr.eh.ether_type
1179                                                 = ETHERTYPE_PPPOE_SESS;
1180                                 sp->pkt_hdr.ph.code = 0;
1181                                 m_freem(neg->m);
1182                                 kfree(sp->neg, M_NETGRAPH);
1183                                 sp->neg = NULL;
1184                                 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1185                                 break;
1186                         case    PADT_CODE:
1187                                 /*
1188                                  * Send a 'close' message to the controlling
1189                                  * process (the one that set us up);
1190                                  * And then tear everything down.
1191                                  *
1192                                  * Find matching peer/session combination.
1193                                  */
1194                                 sendhook = pppoe_findsession(node, wh);
1195                                 NG_FREE_DATA(m, meta); /* no longer needed */
1196                                 if (sendhook == NULL) {
1197                                         LEAVE(ENETUNREACH);
1198                                 }
1199                                 /* send message to creator */
1200                                 /* close hook */
1201                                 if (sendhook) {
1202                                         ng_destroy_hook(sendhook);
1203                                 }
1204                                 break;
1205                         default:
1206                                 LEAVE(EPFNOSUPPORT);
1207                         }
1208                         break;
1209                 case    ETHERTYPE_PPPOE_STUPID_SESS:
1210                 case    ETHERTYPE_PPPOE_SESS:
1211                         /*
1212                          * find matching peer/session combination.
1213                          */
1214                         sendhook = pppoe_findsession(node, wh);
1215                         if (sendhook == NULL) {
1216                                 LEAVE (ENETUNREACH);
1217                                 break;
1218                         }
1219                         sp = sendhook->private;
1220                         m_adj(m, sizeof(*wh));
1221                         if (m->m_pkthdr.len < length) {
1222                                 /* Packet too short, dump it */
1223                                 LEAVE(EMSGSIZE);
1224                         }
1225
1226                         /* Also need to trim excess at the end */
1227                         if (m->m_pkthdr.len > length) {
1228                                 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1229                         }
1230                         if ( sp->state != PPPOE_CONNECTED) {
1231                                 if (sp->state == PPPOE_NEWCONNECTED) {
1232                                         sp->state = PPPOE_CONNECTED;
1233                                         /*
1234                                          * Now we have gone to Connected mode,
1235                                          * Free all resources needed for
1236                                          * negotiation. Be paranoid about
1237                                          * whether there may be a timeout.
1238                                          */
1239                                         m_freem(sp->neg->m);
1240                                         callout_stop(&sp->neg->timeout_ch);
1241                                         kfree(sp->neg, M_NETGRAPH);
1242                                         sp->neg = NULL;
1243                                 } else {
1244                                         LEAVE (ENETUNREACH);
1245                                         break;
1246                                 }
1247                         }
1248                         NG_SEND_DATA( error, sendhook, m, meta);
1249                         break;
1250                 default:
1251                         LEAVE(EPFNOSUPPORT);
1252                 }
1253         } else {
1254                 /*
1255                  *      Not ethernet or debug hook..
1256                  *
1257                  * The packet has come in on a normal hook.
1258                  * We need to find out what kind of hook,
1259                  * So we can decide how to handle it.
1260                  * Check the hook's state.
1261                  */
1262                 sp = hook->private;
1263                 switch (sp->state) {
1264                 case    PPPOE_NEWCONNECTED:
1265                 case    PPPOE_CONNECTED: {
1266                         static const u_char addrctrl[] = { 0xff, 0x03 };
1267                         struct pppoe_full_hdr *wh;
1268
1269                         /*
1270                          * Remove PPP address and control fields, if any.
1271                          * For example, ng_ppp(4) always sends LCP packets
1272                          * with address and control fields as required by
1273                          * generic PPP. PPPoE is an exception to the rule.
1274                          */
1275                         if (m->m_pkthdr.len >= 2) {
1276                                 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1277                                         LEAVE(ENOBUFS);
1278                                 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
1279                                         m_adj(m, 2);
1280                         }
1281                         /*
1282                          * Bang in a pre-made header, and set the length up
1283                          * to be correct. Then send it to the ethernet driver.
1284                          * But first correct the length.
1285                          */
1286                         sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1287                         M_PREPEND(m, sizeof(*wh), M_NOWAIT);
1288                         if (m == NULL) {
1289                                 LEAVE(ENOBUFS);
1290                         }
1291                         wh = mtod(m, struct pppoe_full_hdr *);
1292                         bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1293                         NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
1294                         privp->packets_out++;
1295                         break;
1296                         }
1297                 case    PPPOE_PRIMED:
1298                         /*
1299                          * A PADI packet is being returned by the application
1300                          * that has set up this hook. This indicates that it
1301                          * wants us to offer service.
1302                          */
1303                         neg = sp->neg;
1304                         if (m->m_len < sizeof(*wh)) {
1305                                 m = m_pullup(m, sizeof(*wh));
1306                                 if (m == NULL) {
1307                                         LEAVE(ENOBUFS);
1308                                 }
1309                         }
1310                         wh = mtod(m, struct pppoe_full_hdr *);
1311                         ph = &wh->ph;
1312                         length = ntohs(wh->ph.length);
1313                         code = wh->ph.code;
1314                         if ( code != PADI_CODE) {
1315                                 LEAVE(EINVAL);
1316                         }
1317                         callout_stop(&neg->timeout_ch);
1318
1319                         /*
1320                          * This is the first time we hear
1321                          * from the client, so note it's
1322                          * unicast address, replacing the
1323                          * broadcast address.
1324                          */
1325                         bcopy(wh->eh.ether_shost,
1326                                 neg->pkt->pkt_header.eh.ether_dhost,
1327                                 ETHER_ADDR_LEN);
1328                         sp->state = PPPOE_SOFFER;
1329                         neg->timeout = 0;
1330                         neg->pkt->pkt_header.ph.code = PADO_CODE;
1331
1332                         /*
1333                          * start working out the tags to respond with.
1334                          */
1335                         uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1336                         uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1337                         uniqtag.data.pointer = sp;
1338                         init_tags(sp);
1339                         insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1340                         if ((tag = get_tag(ph, PTT_SRV_NAME)))
1341                                 insert_tag(sp, tag);      /* return service */
1342                         /*
1343                          * If we have a NULL service request
1344                          * and have an extra service defined in this hook,
1345                          * then also add a tag for the extra service.
1346                          * XXX this is a hack. eventually we should be able
1347                          * to support advertising many services, not just one
1348                          */
1349                         if (((tag == NULL) || (tag->tag_len == 0))
1350                         && (neg->service.hdr.tag_len != 0)) {
1351                                 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1352                         }
1353                         if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1354                                 insert_tag(sp, tag); /* returned hostunique */
1355                         insert_tag(sp, &uniqtag.hdr);
1356                         scan_tags(sp, ph);
1357                         make_packet(sp);
1358                         sendpacket(sp);
1359                         break;
1360
1361                 /*
1362                  * Packets coming from the hook make no sense
1363                  * to sessions in these states. Throw them away.
1364                  */
1365                 case    PPPOE_SINIT:
1366                 case    PPPOE_SREQ:
1367                 case    PPPOE_SOFFER:
1368                 case    PPPOE_SNONE:
1369                 case    PPPOE_LISTENING:
1370                 case    PPPOE_DEAD:
1371                 default:
1372                         LEAVE(ENETUNREACH);
1373                 }
1374         }
1375 quit:
1376         NG_FREE_DATA(m, meta);
1377         return error;
1378 }
1379
1380 /*
1381  * Do local shutdown processing..
1382  * If we are a persistant device, we might refuse to go away, and
1383  * we'd only remove our links and reset ourself.
1384  */
1385 static int
1386 ng_pppoe_rmnode(node_p node)
1387 {
1388         const priv_p privdata = node->private;
1389
1390 AAA
1391         node->flags |= NG_INVALID;
1392         ng_cutlinks(node);
1393         ng_unname(node);
1394         node->private = NULL;
1395         ng_unref(privdata->node);
1396         kfree(privdata, M_NETGRAPH);
1397         return (0);
1398 }
1399
1400 /*
1401  * This is called once we've already connected a new hook to the other node.
1402  * It gives us a chance to balk at the last minute.
1403  */
1404 static int
1405 ng_pppoe_connect(hook_p hook)
1406 {
1407         /* be really amiable and just say "YUP that's OK by me! " */
1408         return (0);
1409 }
1410
1411 /*
1412  * Hook disconnection
1413  *
1414  * Clean up all dangling links and information about the session/hook.
1415  * For this type, removal of the last link destroys the node
1416  */
1417 static int
1418 ng_pppoe_disconnect(hook_p hook)
1419 {
1420         node_p node = hook->node;
1421         priv_p privp = node->private;
1422         sessp   sp;
1423         int     hooks;
1424
1425 AAA
1426         hooks = node->numhooks; /* this one already not counted */
1427         if (hook->private == &privp->debug_hook) {
1428                 privp->debug_hook = NULL;
1429         } else if (hook->private == &privp->ethernet_hook) {
1430                 privp->ethernet_hook = NULL;
1431                 ng_rmnode(node);
1432         } else {
1433                 sp = hook->private;
1434                 if (sp->state != PPPOE_SNONE ) {
1435                         pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1436                 }
1437                 /*
1438                  * According to the spec, if we are connected,
1439                  * we should send a DISC packet if we are shutting down
1440                  * a session.
1441                  */
1442                 if ((privp->ethernet_hook)
1443                 && ((sp->state == PPPOE_CONNECTED)
1444                  || (sp->state == PPPOE_NEWCONNECTED))) {
1445                         struct mbuf *m;
1446                         struct pppoe_full_hdr *wh;
1447                         struct pppoe_tag *tag;
1448                         int     msglen = strlen(SIGNOFF);
1449                         void *dummy = NULL;
1450                         int error = 0;
1451
1452                         /* revert the stored header to DISC/PADT mode */
1453                         wh = &sp->pkt_hdr;
1454                         wh->ph.code = PADT_CODE;
1455                         if (pppoe_mode == PPPOE_NONSTANDARD)
1456                                 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1457                         else
1458                                 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1459
1460                         /* generate a packet of that type */
1461                         MGETHDR(m, M_NOWAIT, MT_DATA);
1462                         if(m == NULL)
1463                                 kprintf("pppoe: Session out of mbufs\n");
1464                         else {
1465                                 m->m_pkthdr.rcvif = NULL;
1466                                 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1467                                 bcopy((caddr_t)wh, mtod(m, caddr_t),
1468                                     sizeof(*wh));
1469                                 /*
1470                                  * Add a General error message and adjust
1471                                  * sizes
1472                                  */
1473                                 wh = mtod(m, struct pppoe_full_hdr *);
1474                                 tag = wh->ph.tag;
1475                                 tag->tag_type = PTT_GEN_ERR;
1476                                 tag->tag_len = htons((u_int16_t)msglen);
1477                                 strncpy(tag->tag_data, SIGNOFF, msglen);
1478                                 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1479                                     msglen);
1480                                 wh->ph.length = htons(sizeof(*tag) + msglen);
1481                                 NG_SEND_DATA(error, privp->ethernet_hook, m,
1482                                     dummy);
1483                         }
1484                 }
1485                 /*
1486                  * As long as we have somewhere to store the timeout handle,
1487                  * we may have a timeout pending.. get rid of it.
1488                  */
1489                 if (sp->neg) {
1490                         callout_stop(&sp->neg->timeout_ch);
1491                         if (sp->neg->m)
1492                                 m_freem(sp->neg->m);
1493                         kfree(sp->neg, M_NETGRAPH);
1494                 }
1495                 kfree(sp, M_NETGRAPH);
1496                 hook->private = NULL;
1497                 /* work out how many session hooks there are */
1498                 /* Node goes away on last session hook removal */
1499                 if (privp->ethernet_hook) hooks -= 1;
1500                 if (privp->debug_hook) hooks -= 1;
1501         }
1502         if (node->numhooks == 0)
1503                 ng_rmnode(node);
1504         return (0);
1505 }
1506
1507 /*
1508  * timeouts come here.
1509  */
1510 static void
1511 pppoe_ticker(void *arg)
1512 {
1513         hook_p hook = arg;
1514         sessp   sp = hook->private;
1515         negp    neg = sp->neg;
1516         int     error = 0;
1517         struct mbuf *m0 = NULL;
1518         priv_p privp = hook->node->private;
1519         meta_p dummy = NULL;
1520
1521         crit_enter();
1522 AAA
1523         switch(sp->state) {
1524                 /*
1525                  * resend the last packet, using an exponential backoff.
1526                  * After a period of time, stop growing the backoff,
1527                  * and either leave it, or revert to the start.
1528                  */
1529         case    PPPOE_SINIT:
1530         case    PPPOE_SREQ:
1531                 /* timeouts on these produce resends */
1532                 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1533                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1534                 callout_reset(&neg->timeout_ch, neg->timeout * hz,
1535                                 pppoe_ticker, hook);
1536                 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1537                         if (sp->state == PPPOE_SREQ) {
1538                                 /* revert to SINIT mode */
1539                                 pppoe_start(sp);
1540                         } else {
1541                                 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1542                         }
1543                 }
1544                 break;
1545         case    PPPOE_PRIMED:
1546         case    PPPOE_SOFFER:
1547                 /* a timeout on these says "give up" */
1548                 ng_destroy_hook(hook);
1549                 break;
1550         default:
1551                 /* timeouts have no meaning in other states */
1552                 kprintf("pppoe: unexpected timeout\n");
1553         }
1554         crit_exit();
1555 }
1556
1557
1558 static void
1559 sendpacket(sessp sp)
1560 {
1561         int     error = 0;
1562         struct mbuf *m0 = NULL;
1563         hook_p hook = sp->hook;
1564         negp    neg = sp->neg;
1565         priv_p  privp = hook->node->private;
1566         meta_p dummy = NULL;
1567
1568 AAA
1569         switch(sp->state) {
1570         case    PPPOE_LISTENING:
1571         case    PPPOE_DEAD:
1572         case    PPPOE_SNONE:
1573         case    PPPOE_CONNECTED:
1574                 kprintf("pppoe: sendpacket: unexpected state\n");
1575                 break;
1576
1577         case    PPPOE_NEWCONNECTED:
1578                 /* send the PADS without a timeout - we're now connected */
1579                 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1580                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1581                 break;
1582
1583         case    PPPOE_PRIMED:
1584                 /* No packet to send, but set up the timeout */
1585                 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1586                                 pppoe_ticker, hook);
1587                 break;
1588
1589         case    PPPOE_SOFFER:
1590                 /*
1591                  * send the offer but if they don't respond
1592                  * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1593                  */
1594                 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1595                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1596                 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1597                                 pppoe_ticker, hook);
1598                 break;
1599
1600         case    PPPOE_SINIT:
1601         case    PPPOE_SREQ:
1602                 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1603                 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1604                 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz,
1605                                 pppoe_ticker, hook);
1606                 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1607                 break;
1608
1609         default:
1610                 error = EINVAL;
1611                 kprintf("pppoe: timeout: bad state\n");
1612         }
1613         /* return (error); */
1614 }
1615
1616 /*
1617  * Parse an incoming packet to see if any tags should be copied to the
1618  * output packet. Don't do any tags that have been handled in the main
1619  * state machine.
1620  */
1621 static const struct pppoe_tag*
1622 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1623 {
1624         const char *const end = (const char *)next_tag(ph);
1625         const char *ptn;
1626         const struct pppoe_tag *pt = &ph->tag[0];
1627         /*
1628          * Keep processing tags while a tag header will still fit.
1629          */
1630 AAA
1631         while((const char*)(pt + 1) <= end) {
1632                 /*
1633                  * If the tag data would go past the end of the packet, abort.
1634                  */
1635                 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1636                 if(ptn > end)
1637                         return NULL;
1638
1639                 switch (pt->tag_type) {
1640                 case    PTT_RELAY_SID:
1641                         insert_tag(sp, pt);
1642                         break;
1643                 case    PTT_EOL:
1644                         return NULL;
1645                 case    PTT_SRV_NAME:
1646                 case    PTT_AC_NAME:
1647                 case    PTT_HOST_UNIQ:
1648                 case    PTT_AC_COOKIE:
1649                 case    PTT_VENDOR:
1650                 case    PTT_SRV_ERR:
1651                 case    PTT_SYS_ERR:
1652                 case    PTT_GEN_ERR:
1653                         break;
1654                 }
1655                 pt = (const struct pppoe_tag*)ptn;
1656         }
1657         return NULL;
1658 }
1659
1660 static  int
1661 pppoe_send_event(sessp sp, enum cmd cmdid)
1662 {
1663         int error;
1664         struct ng_mesg *msg;
1665         struct ngpppoe_sts *sts;
1666
1667 AAA
1668         NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1669                         sizeof(struct ngpppoe_sts), M_NOWAIT);
1670         if (msg == NULL)
1671                 return (ENOMEM);
1672         sts = (struct ngpppoe_sts *)msg->data;
1673         strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ);
1674         error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
1675         return (error);
1676 }