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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP_132/] [src/] [netif/] [ppp/] [ppp_oe.c] - Blame information for rev 606

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Line No. Rev Author Line
1 606 jeremybenn
/*****************************************************************************
2
* ppp_oe.c - PPP Over Ethernet implementation for lwIP.
3
*
4
* Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.
5
*
6
* The authors hereby grant permission to use, copy, modify, distribute,
7
* and license this software and its documentation for any purpose, provided
8
* that existing copyright notices are retained in all copies and that this
9
* notice and the following disclaimer are included verbatim in any
10
* distributions. No written agreement, license, or royalty fee is required
11
* for any of the authorized uses.
12
*
13
* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
14
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16
* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
17
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23
*
24
******************************************************************************
25
* REVISION HISTORY
26
*
27
* 06-01-01 Marc Boucher <marc@mbsi.ca>
28
*   Ported to lwIP.
29
*****************************************************************************/
30
 
31
 
32
 
33
/* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */
34
 
35
/*-
36
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
37
 * All rights reserved.
38
 *
39
 * This code is derived from software contributed to The NetBSD Foundation
40
 * by Martin Husemann <martin@NetBSD.org>.
41
 *
42
 * Redistribution and use in source and binary forms, with or without
43
 * modification, are permitted provided that the following conditions
44
 * are met:
45
 * 1. Redistributions of source code must retain the above copyright
46
 *    notice, this list of conditions and the following disclaimer.
47
 * 2. Redistributions in binary form must reproduce the above copyright
48
 *    notice, this list of conditions and the following disclaimer in the
49
 *    documentation and/or other materials provided with the distribution.
50
 * 3. All advertising materials mentioning features or use of this software
51
 *    must display the following acknowledgement:
52
 *        This product includes software developed by the NetBSD
53
 *        Foundation, Inc. and its contributors.
54
 * 4. Neither the name of The NetBSD Foundation nor the names of its
55
 *    contributors may be used to endorse or promote products derived
56
 *    from this software without specific prior written permission.
57
 *
58
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
59
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
60
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
61
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
62
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
63
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
64
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
65
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
66
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
67
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
68
 * POSSIBILITY OF SUCH DAMAGE.
69
 */
70
 
71
#include "lwip/opt.h"
72
 
73
#if PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */
74
 
75
#include "ppp.h"
76
#include "pppdebug.h"
77
 
78
#include "lwip/sys.h"
79
 
80
#include "netif/ppp_oe.h"
81
#include "netif/etharp.h"
82
 
83
#include <string.h>
84
#include <stdio.h>
85
 
86
/** @todo Replace this part with a simple list like other lwIP lists */
87
#ifndef _SYS_QUEUE_H_
88
#define _SYS_QUEUE_H_
89
 
90
/*
91
 * A list is headed by a single forward pointer (or an array of forward
92
 * pointers for a hash table header). The elements are doubly linked
93
 * so that an arbitrary element can be removed without a need to
94
 * traverse the list. New elements can be added to the list before
95
 * or after an existing element or at the head of the list. A list
96
 * may only be traversed in the forward direction.
97
 *
98
 * For details on the use of these macros, see the queue(3) manual page.
99
 */
100
 
101
/*
102
 * List declarations.
103
 */
104
#define  LIST_HEAD(name, type)                                                 \
105
struct name {                                                                  \
106
  struct type *lh_first;  /* first element */                                  \
107
}
108
 
109
#define  LIST_HEAD_INITIALIZER(head)                                           \
110
  { NULL }
111
 
112
#define  LIST_ENTRY(type)                                                      \
113
struct {                                                                       \
114
  struct type *le_next;  /* next element */                                    \
115
  struct type **le_prev; /* address of previous next element */                \
116
}
117
 
118
/*
119
 * List functions.
120
 */
121
 
122
#define  LIST_EMPTY(head)  ((head)->lh_first == NULL)
123
 
124
#define  LIST_FIRST(head)  ((head)->lh_first)
125
 
126
#define  LIST_FOREACH(var, head, field)                                        \
127
  for ((var) = LIST_FIRST((head));                                             \
128
      (var);                                                                   \
129
      (var) = LIST_NEXT((var), field))
130
 
131
#define  LIST_INIT(head) do {                                                  \
132
  LIST_FIRST((head)) = NULL;                                                   \
133
} while (0)
134
 
135
#define  LIST_INSERT_AFTER(listelm, elm, field) do {                           \
136
  if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)         \
137
    LIST_NEXT((listelm), field)->field.le_prev =                               \
138
        &LIST_NEXT((elm), field);                                              \
139
  LIST_NEXT((listelm), field) = (elm);                                         \
140
  (elm)->field.le_prev = &LIST_NEXT((listelm), field);                         \
141
} while (0)
142
 
143
#define  LIST_INSERT_BEFORE(listelm, elm, field) do {                          \
144
  (elm)->field.le_prev = (listelm)->field.le_prev;                             \
145
  LIST_NEXT((elm), field) = (listelm);                                         \
146
  *(listelm)->field.le_prev = (elm);                                           \
147
  (listelm)->field.le_prev = &LIST_NEXT((elm), field);                         \
148
} while (0)
149
 
150
#define  LIST_INSERT_HEAD(head, elm, field) do {                               \
151
  if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)                  \
152
    LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);              \
153
  LIST_FIRST((head)) = (elm);                                                  \
154
  (elm)->field.le_prev = &LIST_FIRST((head));                                  \
155
} while (0)
156
 
157
#define  LIST_NEXT(elm, field)  ((elm)->field.le_next)
158
 
159
#define  LIST_REMOVE(elm, field) do {                                          \
160
  if (LIST_NEXT((elm), field) != NULL)                                         \
161
    LIST_NEXT((elm), field)->field.le_prev =                                   \
162
        (elm)->field.le_prev;                                                  \
163
  *(elm)->field.le_prev = LIST_NEXT((elm), field);                             \
164
} while (0)
165
 
166
#endif /* !_SYS_QUEUE_H_ */
167
 
168
 
169
/* Add a 16 bit unsigned value to a buffer pointed to by PTR */
170
#define PPPOE_ADD_16(PTR, VAL) \
171
    *(PTR)++ = (VAL) / 256;    \
172
    *(PTR)++ = (VAL) % 256
173
 
174
/* Add a complete PPPoE header to the buffer pointed to by PTR */
175
#define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \
176
    *(PTR)++ = PPPOE_VERTYPE;  \
177
    *(PTR)++ = (CODE);         \
178
    PPPOE_ADD_16(PTR, SESS);   \
179
    PPPOE_ADD_16(PTR, LEN)
180
 
181
#define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */
182
#define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */
183
#define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */
184
#define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */
185
 
186
#ifdef PPPOE_SERVER
187
/* from if_spppsubr.c */
188
#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
189
#endif
190
 
191
struct pppoe_softc {
192
  LIST_ENTRY(pppoe_softc) sc_list;
193
  struct netif *sc_ethif;      /* ethernet interface we are using */
194
  int sc_pd;                   /* ppp unit number */
195
  void (*sc_linkStatusCB)(int pd, int up);
196
 
197
  int sc_state;                /* discovery phase or session connected */
198
  struct eth_addr sc_dest;     /* hardware address of concentrator */
199
  u16_t sc_session;            /* PPPoE session id */
200
 
201
  char *sc_service_name;       /* if != NULL: requested name of service */
202
  char *sc_concentrator_name;  /* if != NULL: requested concentrator id */
203
  u8_t *sc_ac_cookie;          /* content of AC cookie we must echo back */
204
  size_t sc_ac_cookie_len;     /* length of cookie data */
205
#ifdef PPPOE_SERVER
206
  u8_t *sc_hunique;            /* content of host unique we must echo back */
207
  size_t sc_hunique_len;       /* length of host unique */
208
#endif
209
  int sc_padi_retried;         /* number of PADI retries already done */
210
  int sc_padr_retried;         /* number of PADR retries already done */
211
};
212
 
213
/* input routines */
214
static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);
215
 
216
/* management routines */
217
static int pppoe_do_disconnect(struct pppoe_softc *);
218
static void pppoe_abort_connect(struct pppoe_softc *);
219
static void pppoe_clear_softc(struct pppoe_softc *, const char *);
220
 
221
/* internal timeout handling */
222
static void pppoe_timeout(void *);
223
 
224
/* sending actual protocol controll packets */
225
static err_t pppoe_send_padi(struct pppoe_softc *);
226
static err_t pppoe_send_padr(struct pppoe_softc *);
227
#ifdef PPPOE_SERVER
228
static err_t pppoe_send_pado(struct pppoe_softc *);
229
static err_t pppoe_send_pads(struct pppoe_softc *);
230
#endif
231
static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
232
 
233
/* internal helper functions */
234
static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);
235
static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);
236
 
237
static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
238
 
239
int pppoe_hdrlen;
240
 
241
void
242
pppoe_init(void)
243
{
244
  pppoe_hdrlen = sizeof(struct eth_hdr) + PPPOE_HEADERLEN;
245
  LIST_INIT(&pppoe_softc_list);
246
}
247
 
248
err_t
249
pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)
250
{
251
  struct pppoe_softc *sc;
252
 
253
  sc = mem_malloc(sizeof(struct pppoe_softc));
254
  if(!sc) {
255
    *scptr = NULL;
256
    return ERR_MEM;
257
  }
258
  memset(sc, 0, sizeof(struct pppoe_softc));
259
 
260
  /* changed to real address later */
261
  MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
262
 
263
  sc->sc_pd = pd;
264
  sc->sc_linkStatusCB = linkStatusCB;
265
  sc->sc_ethif = ethif;
266
 
267
  LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
268
 
269
  *scptr = sc;
270
 
271
  return ERR_OK;
272
}
273
 
274
err_t
275
pppoe_destroy(struct netif *ifp)
276
{
277
  struct pppoe_softc * sc;
278
 
279
  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
280
    if (sc->sc_ethif == ifp) {
281
      break;
282
    }
283
  }
284
 
285
  if(!(sc && (sc->sc_ethif == ifp))) {
286
    return ERR_IF;
287
  }
288
 
289
  tcpip_untimeout(pppoe_timeout, sc);
290
  LIST_REMOVE(sc, sc_list);
291
 
292
  if (sc->sc_concentrator_name) {
293
    mem_free(sc->sc_concentrator_name);
294
  }
295
  if (sc->sc_service_name) {
296
    mem_free(sc->sc_service_name);
297
  }
298
  if (sc->sc_ac_cookie) {
299
    mem_free(sc->sc_ac_cookie);
300
  }
301
  mem_free(sc);
302
 
303
  return ERR_OK;
304
}
305
 
306
/*
307
 * Find the interface handling the specified session.
308
 * Note: O(number of sessions open), this is a client-side only, mean
309
 * and lean implementation, so number of open sessions typically should
310
 * be 1.
311
 */
312
static struct pppoe_softc *
313
pppoe_find_softc_by_session(u_int session, struct netif *rcvif)
314
{
315
  struct pppoe_softc *sc;
316
 
317
  if (session == 0) {
318
    return NULL;
319
  }
320
 
321
  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
322
    if (sc->sc_state == PPPOE_STATE_SESSION
323
        && sc->sc_session == session) {
324
      if (sc->sc_ethif == rcvif) {
325
        return sc;
326
      } else {
327
        return NULL;
328
      }
329
    }
330
  }
331
  return NULL;
332
}
333
 
334
/* Check host unique token passed and return appropriate softc pointer,
335
 * or NULL if token is bogus. */
336
static struct pppoe_softc *
337
pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)
338
{
339
  struct pppoe_softc *sc, *t;
340
 
341
  if (LIST_EMPTY(&pppoe_softc_list)) {
342
    return NULL;
343
  }
344
 
345
  if (len != sizeof sc) {
346
    return NULL;
347
  }
348
  MEMCPY(&t, token, len);
349
 
350
  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
351
    if (sc == t) {
352
      break;
353
    }
354
  }
355
 
356
  if (sc == NULL) {
357
    PPPDEBUG((LOG_DEBUG, "pppoe: alien host unique tag, no session found\n"));
358
    return NULL;
359
  }
360
 
361
  /* should be safe to access *sc now */
362
  if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
363
    printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
364
      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);
365
    return NULL;
366
  }
367
  if (sc->sc_ethif != rcvif) {
368
    printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",
369
      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
370
    return NULL;
371
  }
372
  return sc;
373
}
374
 
375
static void
376
pppoe_linkstatus_up(void *arg)
377
{
378
  struct pppoe_softc *sc = (struct pppoe_softc*)arg;
379
 
380
  sc->sc_linkStatusCB(sc->sc_pd, 1);
381
}
382
 
383
/* analyze and handle a single received packet while not in session state */
384
static void
385
pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)
386
{
387
  u16_t tag, len;
388
  u16_t session, plen;
389
  struct pppoe_softc *sc;
390
  const char *err_msg;
391
  char devname[6];
392
  char *error;
393
  u8_t *ac_cookie;
394
  size_t ac_cookie_len;
395
#ifdef PPPOE_SERVER
396
  u8_t *hunique;
397
  size_t hunique_len;
398
#endif
399
  struct pppoehdr *ph;
400
  struct pppoetag pt;
401
  int off, err, errortag;
402
  struct eth_hdr *ethhdr;
403
 
404
  pb = pppSingleBuf(pb);
405
 
406
  strcpy(devname, "pppoe");  /* as long as we don't know which instance */
407
  err_msg = NULL;
408
  errortag = 0;
409
  if (pb->len < sizeof(*ethhdr)) {
410
    goto done;
411
  }
412
  ethhdr = (struct eth_hdr *)pb->payload;
413
  off = sizeof(*ethhdr);
414
 
415
  ac_cookie = NULL;
416
  ac_cookie_len = 0;
417
#ifdef PPPOE_SERVER
418
  hunique = NULL;
419
  hunique_len = 0;
420
#endif
421
  session = 0;
422
  if (pb->len - off < PPPOE_HEADERLEN) {
423
    printf("pppoe: packet too short: %d\n", pb->len);
424
    goto done;
425
  }
426
 
427
  ph = (struct pppoehdr *) (ethhdr + 1);
428
  if (ph->vertype != PPPOE_VERTYPE) {
429
    printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);
430
    goto done;
431
  }
432
  session = ntohs(ph->session);
433
  plen = ntohs(ph->plen);
434
  off += sizeof(*ph);
435
 
436
  if (plen + off > pb->len) {
437
    printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
438
        pb->len - off, plen);
439
    goto done;
440
  }
441
  if(pb->tot_len == pb->len) {
442
    pb->tot_len = pb->len = off + plen; /* ignore trailing garbage */
443
  }
444
  tag = 0;
445
  len = 0;
446
  sc = NULL;
447
  while (off + sizeof(pt) <= pb->len) {
448
    MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
449
    tag = ntohs(pt.tag);
450
    len = ntohs(pt.len);
451
    if (off + sizeof(pt) + len > pb->len) {
452
      printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
453
      goto done;
454
    }
455
    switch (tag) {
456
      case PPPOE_TAG_EOL:
457
        goto breakbreak;
458
      case PPPOE_TAG_SNAME:
459
        break;  /* ignored */
460
      case PPPOE_TAG_ACNAME:
461
        break;  /* ignored */
462
      case PPPOE_TAG_HUNIQUE:
463
        if (sc != NULL) {
464
          break;
465
        }
466
#ifdef PPPOE_SERVER
467
        hunique = (u8_t*)pb->payload + off + sizeof(pt);
468
        hunique_len = len;
469
#endif
470
        sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
471
        if (sc != NULL) {
472
          snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
473
        }
474
        break;
475
      case PPPOE_TAG_ACCOOKIE:
476
        if (ac_cookie == NULL) {
477
          ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
478
          ac_cookie_len = len;
479
        }
480
        break;
481
      case PPPOE_TAG_SNAME_ERR:
482
        err_msg = "SERVICE NAME ERROR";
483
        errortag = 1;
484
        break;
485
      case PPPOE_TAG_ACSYS_ERR:
486
        err_msg = "AC SYSTEM ERROR";
487
        errortag = 1;
488
        break;
489
      case PPPOE_TAG_GENERIC_ERR:
490
        err_msg = "GENERIC ERROR";
491
        errortag = 1;
492
        break;
493
    }
494
    if (err_msg) {
495
      error = NULL;
496
      if (errortag && len) {
497
        error = mem_malloc(len+1);
498
        if (error) {
499
          strncpy(error, (char*)pb->payload + off + sizeof(pt), len);
500
          error[len-1] = '\0';
501
        }
502
      }
503
      if (error) {
504
        printf("%s: %s: %s\n", devname, err_msg, error);
505
        mem_free(error);
506
      } else {
507
        printf("%s: %s\n", devname, err_msg);
508
      }
509
      if (errortag) {
510
        goto done;
511
      }
512
    }
513
    off += sizeof(pt) + len;
514
  }
515
 
516
breakbreak:;
517
  switch (ph->code) {
518
    case PPPOE_CODE_PADI:
519
#ifdef PPPOE_SERVER
520
      /*
521
       * got service name, concentrator name, and/or host unique.
522
       * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
523
       */
524
      if (LIST_EMPTY(&pppoe_softc_list)) {
525
        goto done;
526
      }
527
      LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
528
        if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
529
          continue;
530
        }
531
        if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
532
          continue;
533
        }
534
        if (sc->sc_state == PPPOE_STATE_INITIAL) {
535
          break;
536
        }
537
      }
538
      if (sc == NULL) {
539
        /* printf("pppoe: free passive interface is not found\n"); */
540
        goto done;
541
      }
542
      if (hunique) {
543
        if (sc->sc_hunique) {
544
          mem_free(sc->sc_hunique);
545
        }
546
        sc->sc_hunique = mem_malloc(hunique_len);
547
        if (sc->sc_hunique == NULL) {
548
          goto done;
549
        }
550
        sc->sc_hunique_len = hunique_len;
551
        MEMCPY(sc->sc_hunique, hunique, hunique_len);
552
      }
553
      MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
554
      sc->sc_state = PPPOE_STATE_PADO_SENT;
555
      pppoe_send_pado(sc);
556
      break;
557
  #endif /* PPPOE_SERVER */
558
    case PPPOE_CODE_PADR:
559
  #ifdef PPPOE_SERVER
560
      /*
561
       * get sc from ac_cookie if IFF_PASSIVE
562
       */
563
      if (ac_cookie == NULL) {
564
        /* be quiet if there is not a single pppoe instance */
565
        printf("pppoe: received PADR but not includes ac_cookie\n");
566
        goto done;
567
      }
568
      sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
569
      if (sc == NULL) {
570
        /* be quiet if there is not a single pppoe instance */
571
        if (!LIST_EMPTY(&pppoe_softc_list)) {
572
          printf("pppoe: received PADR but could not find request for it\n");
573
        }
574
        goto done;
575
      }
576
      if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
577
        printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
578
        goto done;
579
      }
580
      if (hunique) {
581
        if (sc->sc_hunique) {
582
          mem_free(sc->sc_hunique);
583
        }
584
        sc->sc_hunique = mem_malloc(hunique_len);
585
        if (sc->sc_hunique == NULL) {
586
          goto done;
587
        }
588
        sc->sc_hunique_len = hunique_len;
589
        MEMCPY(sc->sc_hunique, hunique, hunique_len);
590
      }
591
      pppoe_send_pads(sc);
592
      sc->sc_state = PPPOE_STATE_SESSION;
593
      tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */
594
      break;
595
  #else
596
      /* ignore, we are no access concentrator */
597
      goto done;
598
  #endif /* PPPOE_SERVER */
599
    case PPPOE_CODE_PADO:
600
      if (sc == NULL) {
601
        /* be quiet if there is not a single pppoe instance */
602
        if (!LIST_EMPTY(&pppoe_softc_list)) {
603
          printf("pppoe: received PADO but could not find request for it\n");
604
        }
605
        goto done;
606
      }
607
      if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
608
        printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
609
        goto done;
610
      }
611
      if (ac_cookie) {
612
        if (sc->sc_ac_cookie) {
613
          mem_free(sc->sc_ac_cookie);
614
        }
615
        sc->sc_ac_cookie = mem_malloc(ac_cookie_len);
616
        if (sc->sc_ac_cookie == NULL) {
617
          goto done;
618
        }
619
        sc->sc_ac_cookie_len = ac_cookie_len;
620
        MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
621
      }
622
      MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
623
      tcpip_untimeout(pppoe_timeout, sc);
624
      sc->sc_padr_retried = 0;
625
      sc->sc_state = PPPOE_STATE_PADR_SENT;
626
      if ((err = pppoe_send_padr(sc)) != 0) {
627
        PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
628
      }
629
      tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
630
      break;
631
    case PPPOE_CODE_PADS:
632
      if (sc == NULL) {
633
        goto done;
634
      }
635
      sc->sc_session = session;
636
      tcpip_untimeout(pppoe_timeout, sc);
637
      PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": session 0x%x connected\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, session));
638
      sc->sc_state = PPPOE_STATE_SESSION;
639
      tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */
640
      break;
641
    case PPPOE_CODE_PADT:
642
      if (sc == NULL) {
643
        goto done;
644
      }
645
      pppoe_clear_softc(sc, "received PADT");
646
      break;
647
    default:
648
      if(sc) {
649
        printf("%c%c%"U16_F": unknown code (0x%04x) session = 0x%04x\n",
650
            sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
651
            ph->code, session);
652
      } else {
653
        printf("pppoe: unknown code (0x%04x) session = 0x%04x\n", ph->code, session);
654
      }
655
      break;
656
  }
657
 
658
done:
659
  pbuf_free(pb);
660
  return;
661
}
662
 
663
void
664
pppoe_disc_input(struct netif *netif, struct pbuf *p)
665
{
666
  /* avoid error messages if there is not a single pppoe instance */
667
  if (!LIST_EMPTY(&pppoe_softc_list)) {
668
    pppoe_dispatch_disc_pkt(netif, p);
669
  } else {
670
    pbuf_free(p);
671
  }
672
}
673
 
674
void
675
pppoe_data_input(struct netif *netif, struct pbuf *pb)
676
{
677
  u16_t session, plen;
678
  struct pppoe_softc *sc;
679
  struct pppoehdr *ph;
680
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
681
  u8_t shost[ETHER_ADDR_LEN];
682
#endif
683
 
684
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
685
  MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
686
#endif
687
  if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
688
    /* bail out */
689
    PPPDEBUG((LOG_ERR, "pppoe_data_input: pbuf_header failed\n"));
690
    LINK_STATS_INC(link.lenerr);
691
    goto drop;
692
  }
693
 
694
  pb = pppSingleBuf (pb);
695
 
696
  if (pb->len <= PPPOE_HEADERLEN) {
697
    printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
698
    goto drop;
699
  }
700
 
701
  if (pb->len < sizeof(*ph)) {
702
    printf("pppoe_data_input: could not get PPPoE header\n");
703
    goto drop;
704
  }
705
  ph = (struct pppoehdr *)pb->payload;
706
 
707
  if (ph->vertype != PPPOE_VERTYPE) {
708
    printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
709
    goto drop;
710
  }
711
  if (ph->code != 0) {
712
    goto drop;
713
  }
714
 
715
  session = ntohs(ph->session);
716
  sc = pppoe_find_softc_by_session(session, netif);
717
  if (sc == NULL) {
718
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
719
    printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
720
    pppoe_send_padt(netif, session, shost);
721
#endif
722
    goto drop;
723
  }
724
 
725
  plen = ntohs(ph->plen);
726
 
727
  if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
728
    /* bail out */
729
    PPPDEBUG((LOG_ERR, "pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
730
    LINK_STATS_INC(link.lenerr);
731
    goto drop;
732
  }
733
 
734
  PPPDEBUG((LOG_DEBUG, "pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
735
        sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
736
        pb->len, plen));
737
 
738
  if (pb->len < plen) {
739
    goto drop;
740
  }
741
 
742
  pppInProcOverEthernet(sc->sc_pd, pb);
743
 
744
  return;
745
 
746
drop:
747
  pbuf_free(pb);
748
}
749
 
750
static err_t
751
pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
752
{
753
  struct eth_hdr *ethhdr;
754
  u16_t etype;
755
  err_t res;
756
 
757
  if (!sc->sc_ethif) {
758
    pbuf_free(pb);
759
    return ERR_IF;
760
  }
761
 
762
  ethhdr = (struct eth_hdr *)pb->payload;
763
  etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
764
  ethhdr->type = htons(etype);
765
  MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
766
  MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));
767
 
768
  PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F" (%x) state=%d, session=0x%x output -> %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F", len=%d\n",
769
      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
770
      sc->sc_state, sc->sc_session,
771
      sc->sc_dest.addr[0], sc->sc_dest.addr[1], sc->sc_dest.addr[2], sc->sc_dest.addr[3], sc->sc_dest.addr[4], sc->sc_dest.addr[5],
772
      pb->tot_len));
773
 
774
  res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
775
 
776
  pbuf_free(pb);
777
 
778
  return res;
779
}
780
 
781
static err_t
782
pppoe_send_padi(struct pppoe_softc *sc)
783
{
784
  struct pbuf *pb;
785
  u8_t *p;
786
  int len, l1 = 0, l2 = 0; /* XXX: gcc */
787
 
788
  if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
789
    PPPDEBUG((LOG_ERR, "ERROR: pppoe_send_padi in state %d", sc->sc_state));
790
  }
791
 
792
  /* calculate length of frame (excluding ethernet header + pppoe header) */
793
  len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
794
  if (sc->sc_service_name != NULL) {
795
    l1 = strlen(sc->sc_service_name);
796
    len += l1;
797
  }
798
  if (sc->sc_concentrator_name != NULL) {
799
    l2 = strlen(sc->sc_concentrator_name);
800
    len += 2 + 2 + l2;
801
  }
802
 
803
  /* allocate a buffer */
804
  pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
805
  if (!pb) {
806
    return ERR_MEM;
807
  }
808
 
809
  p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
810
  /* fill in pkt */
811
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, len);
812
  PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
813
  if (sc->sc_service_name != NULL) {
814
    PPPOE_ADD_16(p, l1);
815
    MEMCPY(p, sc->sc_service_name, l1);
816
    p += l1;
817
  } else {
818
    PPPOE_ADD_16(p, 0);
819
  }
820
  if (sc->sc_concentrator_name != NULL) {
821
    PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
822
    PPPOE_ADD_16(p, l2);
823
    MEMCPY(p, sc->sc_concentrator_name, l2);
824
    p += l2;
825
  }
826
  PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
827
  PPPOE_ADD_16(p, sizeof(sc));
828
  MEMCPY(p, &sc, sizeof sc);
829
 
830
  /* send pkt */
831
  return pppoe_output(sc, pb);
832
}
833
 
834
static void
835
pppoe_timeout(void *arg)
836
{
837
  int retry_wait, err;
838
  struct pppoe_softc *sc = (struct pppoe_softc*)arg;
839
 
840
  PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
841
 
842
  switch (sc->sc_state) {
843
    case PPPOE_STATE_PADI_SENT:
844
      /*
845
       * We have two basic ways of retrying:
846
       *  - Quick retry mode: try a few times in short sequence
847
       *  - Slow retry mode: we already had a connection successfully
848
       *    established and will try infinitely (without user
849
       *    intervention)
850
       * We only enter slow retry mode if IFF_LINK1 (aka autodial)
851
       * is not set.
852
       */
853
 
854
      /* initialize for quick retry mode */
855
      retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);
856
 
857
      sc->sc_padi_retried++;
858
      if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
859
#if 0
860
        if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
861
          /* slow retry mode */
862
          retry_wait = PPPOE_SLOW_RETRY;
863
        } else
864
#endif
865
        {
866
          pppoe_abort_connect(sc);
867
          return;
868
        }
869
      }
870
      if ((err = pppoe_send_padi(sc)) != 0) {
871
        sc->sc_padi_retried--;
872
        PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": failed to transmit PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
873
      }
874
      tcpip_timeout(retry_wait, pppoe_timeout, sc);
875
      break;
876
 
877
    case PPPOE_STATE_PADR_SENT:
878
      sc->sc_padr_retried++;
879
      if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
880
        MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
881
        sc->sc_state = PPPOE_STATE_PADI_SENT;
882
        sc->sc_padr_retried = 0;
883
        if ((err = pppoe_send_padi(sc)) != 0) {
884
          PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
885
        }
886
        tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
887
        return;
888
      }
889
      if ((err = pppoe_send_padr(sc)) != 0) {
890
        sc->sc_padr_retried--;
891
        PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
892
      }
893
      tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
894
      break;
895
    case PPPOE_STATE_CLOSING:
896
      pppoe_do_disconnect(sc);
897
      break;
898
    default:
899
      return;  /* all done, work in peace */
900
  }
901
}
902
 
903
/* Start a connection (i.e. initiate discovery phase) */
904
int
905
pppoe_connect(struct pppoe_softc *sc)
906
{
907
  int err;
908
 
909
  if (sc->sc_state != PPPOE_STATE_INITIAL) {
910
    return EBUSY;
911
  }
912
 
913
#ifdef PPPOE_SERVER
914
  /* wait PADI if IFF_PASSIVE */
915
  if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
916
    return 0;
917
  }
918
#endif
919
  /* save state, in case we fail to send PADI */
920
  sc->sc_state = PPPOE_STATE_PADI_SENT;
921
  sc->sc_padr_retried = 0;
922
  err = pppoe_send_padi(sc);
923
  PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
924
  tcpip_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
925
  return err;
926
}
927
 
928
/* disconnect */
929
void
930
pppoe_disconnect(struct pppoe_softc *sc)
931
{
932
  if (sc->sc_state < PPPOE_STATE_SESSION) {
933
    return;
934
  }
935
  /*
936
   * Do not call pppoe_disconnect here, the upper layer state
937
   * machine gets confused by this. We must return from this
938
   * function and defer disconnecting to the timeout handler.
939
   */
940
  sc->sc_state = PPPOE_STATE_CLOSING;
941
  tcpip_timeout(20, pppoe_timeout, sc);
942
}
943
 
944
static int
945
pppoe_do_disconnect(struct pppoe_softc *sc)
946
{
947
  int err;
948
 
949
  if (sc->sc_state < PPPOE_STATE_SESSION) {
950
    err = EBUSY;
951
  } else {
952
    PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
953
    err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
954
  }
955
 
956
  /* cleanup softc */
957
  sc->sc_state = PPPOE_STATE_INITIAL;
958
  MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
959
  if (sc->sc_ac_cookie) {
960
    mem_free(sc->sc_ac_cookie);
961
    sc->sc_ac_cookie = NULL;
962
  }
963
  sc->sc_ac_cookie_len = 0;
964
#ifdef PPPOE_SERVER
965
  if (sc->sc_hunique) {
966
    mem_free(sc->sc_hunique);
967
    sc->sc_hunique = NULL;
968
  }
969
  sc->sc_hunique_len = 0;
970
#endif
971
  sc->sc_session = 0;
972
 
973
  sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
974
 
975
  return err;
976
}
977
 
978
/* Connection attempt aborted */
979
static void
980
pppoe_abort_connect(struct pppoe_softc *sc)
981
{
982
  printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
983
  sc->sc_state = PPPOE_STATE_CLOSING;
984
 
985
  sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
986
 
987
  /* clear connection state */
988
  MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
989
  sc->sc_state = PPPOE_STATE_INITIAL;
990
}
991
 
992
/* Send a PADR packet */
993
static err_t
994
pppoe_send_padr(struct pppoe_softc *sc)
995
{
996
  struct pbuf *pb;
997
  u8_t *p;
998
  size_t len, l1 = 0; /* XXX: gcc */
999
 
1000
  if (sc->sc_state != PPPOE_STATE_PADR_SENT) {
1001
    return ERR_CONN;
1002
  }
1003
 
1004
  len = 2 + 2 + 2 + 2 + sizeof(sc);    /* service name, host unique */
1005
  if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
1006
    l1 = strlen(sc->sc_service_name);
1007
    len += l1;
1008
  }
1009
  if (sc->sc_ac_cookie_len > 0) {
1010
    len += 2 + 2 + sc->sc_ac_cookie_len;  /* AC cookie */
1011
  }
1012
  pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1013
  if (!pb) {
1014
    return ERR_MEM;
1015
  }
1016
  p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1017
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
1018
  PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1019
  if (sc->sc_service_name != NULL) {
1020
    PPPOE_ADD_16(p, l1);
1021
    MEMCPY(p, sc->sc_service_name, l1);
1022
    p += l1;
1023
  } else {
1024
    PPPOE_ADD_16(p, 0);
1025
  }
1026
  if (sc->sc_ac_cookie_len > 0) {
1027
    PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1028
    PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
1029
    MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
1030
    p += sc->sc_ac_cookie_len;
1031
  }
1032
  PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1033
  PPPOE_ADD_16(p, sizeof(sc));
1034
  MEMCPY(p, &sc, sizeof sc);
1035
 
1036
  return pppoe_output(sc, pb);
1037
}
1038
 
1039
/* send a PADT packet */
1040
static err_t
1041
pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
1042
{
1043
  struct pbuf *pb;
1044
  struct eth_hdr *ethhdr;
1045
  err_t res;
1046
  u8_t *p;
1047
 
1048
  pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM);
1049
  if (!pb) {
1050
    return ERR_MEM;
1051
  }
1052
 
1053
  ethhdr = (struct eth_hdr *)pb->payload;
1054
  ethhdr->type = htons(ETHTYPE_PPPOEDISC);
1055
  MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
1056
  MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, sizeof(ethhdr->src.addr));
1057
 
1058
  p = (u8_t*)(ethhdr + 1);
1059
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
1060
 
1061
  res = outgoing_if->linkoutput(outgoing_if, pb);
1062
 
1063
  pbuf_free(pb);
1064
 
1065
  return res;
1066
}
1067
 
1068
#ifdef PPPOE_SERVER
1069
static err_t
1070
pppoe_send_pado(struct pppoe_softc *sc)
1071
{
1072
  struct pbuf *pb;
1073
  u8_t *p;
1074
  size_t len;
1075
 
1076
  if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
1077
    return ERR_CONN;
1078
  }
1079
 
1080
  /* calc length */
1081
  len = 0;
1082
  /* include ac_cookie */
1083
  len += 2 + 2 + sizeof(sc);
1084
  /* include hunique */
1085
  len += 2 + 2 + sc->sc_hunique_len;
1086
  pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1087
  if (!pb) {
1088
    return ERR_MEM;
1089
  }
1090
  p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1091
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
1092
  PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1093
  PPPOE_ADD_16(p, sizeof(sc));
1094
  MEMCPY(p, &sc, sizeof(sc));
1095
  p += sizeof(sc);
1096
  PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1097
  PPPOE_ADD_16(p, sc->sc_hunique_len);
1098
  MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1099
  return pppoe_output(sc, pb);
1100
}
1101
 
1102
static err_t
1103
pppoe_send_pads(struct pppoe_softc *sc)
1104
{
1105
  struct pbuf *pb;
1106
  u8_t *p;
1107
  size_t len, l1 = 0;  /* XXX: gcc */
1108
 
1109
  if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
1110
    return ERR_CONN;
1111
  }
1112
 
1113
  sc->sc_session = mono_time.tv_sec % 0xff + 1;
1114
  /* calc length */
1115
  len = 0;
1116
  /* include hunique */
1117
  len += 2 + 2 + 2 + 2 + sc->sc_hunique_len;  /* service name, host unique*/
1118
  if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
1119
    l1 = strlen(sc->sc_service_name);
1120
    len += l1;
1121
  }
1122
  pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1123
  if (!pb) {
1124
    return ERR_MEM;
1125
  }
1126
  p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1127
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
1128
  PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1129
  if (sc->sc_service_name != NULL) {
1130
    PPPOE_ADD_16(p, l1);
1131
    MEMCPY(p, sc->sc_service_name, l1);
1132
    p += l1;
1133
  } else {
1134
    PPPOE_ADD_16(p, 0);
1135
  }
1136
  PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1137
  PPPOE_ADD_16(p, sc->sc_hunique_len);
1138
  MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1139
  return pppoe_output(sc, pb);
1140
}
1141
#endif
1142
 
1143
err_t
1144
pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
1145
{
1146
  u8_t *p;
1147
  size_t len;
1148
 
1149
  /* are we ready to process data yet? */
1150
  if (sc->sc_state < PPPOE_STATE_SESSION) {
1151
    /*sppp_flush(&sc->sc_sppp.pp_if);*/
1152
    pbuf_free(pb);
1153
    return ERR_CONN;
1154
  }
1155
 
1156
  len = pb->tot_len;
1157
 
1158
  /* make room for Ethernet header - should not fail */
1159
  if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) {
1160
    /* bail out */
1161
    PPPDEBUG((LOG_ERR, "pppoe: %c%c%"U16_F": pppoe_xmit: could not allocate room for header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
1162
    LINK_STATS_INC(link.lenerr);
1163
    pbuf_free(pb);
1164
    return ERR_BUF;
1165
  }
1166
 
1167
  p = (u8_t*)pb->payload + sizeof(struct eth_hdr);
1168
  PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
1169
 
1170
  return pppoe_output(sc, pb);
1171
}
1172
 
1173
#if 0 /*def PFIL_HOOKS*/
1174
static int
1175
pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
1176
{
1177
  struct pppoe_softc *sc;
1178
  int s;
1179
 
1180
  if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
1181
    return 0;
1182
  }
1183
 
1184
  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
1185
    if (sc->sc_ethif != ifp) {
1186
      continue;
1187
    }
1188
    if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
1189
      sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1190
      printf("%c%c%"U16_F": ethernet interface detached, going down\n",
1191
          sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
1192
    }
1193
    sc->sc_ethif = NULL;
1194
    pppoe_clear_softc(sc, "ethernet interface detached");
1195
  }
1196
 
1197
  return 0;
1198
}
1199
#endif
1200
 
1201
static void
1202
pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
1203
{
1204
  LWIP_UNUSED_ARG(message);
1205
 
1206
  /* stop timer */
1207
  tcpip_untimeout(pppoe_timeout, sc);
1208
  PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": session 0x%x terminated, %s\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_session, message));
1209
 
1210
  /* fix our state */
1211
  sc->sc_state = PPPOE_STATE_INITIAL;
1212
 
1213
  /* notify upper layers */
1214
  sc->sc_linkStatusCB(sc->sc_pd, 0);
1215
 
1216
  /* clean up softc */
1217
  MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
1218
  if (sc->sc_ac_cookie) {
1219
    mem_free(sc->sc_ac_cookie);
1220
    sc->sc_ac_cookie = NULL;
1221
  }
1222
  sc->sc_ac_cookie_len = 0;
1223
  sc->sc_session = 0;
1224
}
1225
 
1226
#endif /* PPPOE_SUPPORT */
1227
 

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