/
if_pppoe.c
1503 lines (1349 loc) · 38.6 KB
/
if_pppoe.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* $NetBSD: if_pppoe.c,v 1.81.10.1 2008/01/02 21:57:08 bouyer Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Martin Husemann <martin@NetBSD.org>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.81.10.1 2008/01/02 21:57:08 bouyer Exp $");
#include "pppoe.h"
#include "bpfilter.h"
#include "opt_pfil_hooks.h"
#include "opt_pppoe.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/kauth.h>
#include <sys/intr.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <net/if_sppp.h>
#include <net/if_spppvar.h>
#include <net/if_pppoe.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#undef PPPOE_DEBUG /* XXX - remove this or make it an option */
/* #define PPPOE_DEBUG 1 */
struct pppoehdr {
u_int8_t vertype;
u_int8_t code;
u_int16_t session;
u_int16_t plen;
} __packed;
struct pppoetag {
u_int16_t tag;
u_int16_t len;
} __packed;
#define PPPOE_HEADERLEN sizeof(struct pppoehdr)
#define PPPOE_OVERHEAD (PPPOE_HEADERLEN + 2)
#define PPPOE_VERTYPE 0x11 /* VER=1, TYPE = 1 */
#define PPPOE_TAG_EOL 0x0000 /* end of list */
#define PPPOE_TAG_SNAME 0x0101 /* service name */
#define PPPOE_TAG_ACNAME 0x0102 /* access concentrator name */
#define PPPOE_TAG_HUNIQUE 0x0103 /* host unique */
#define PPPOE_TAG_ACCOOKIE 0x0104 /* AC cookie */
#define PPPOE_TAG_VENDOR 0x0105 /* vendor specific */
#define PPPOE_TAG_RELAYSID 0x0110 /* relay session id */
#define PPPOE_TAG_SNAME_ERR 0x0201 /* service name error */
#define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */
#define PPPOE_TAG_GENERIC_ERR 0x0203 /* gerneric error */
#define PPPOE_CODE_PADI 0x09 /* Active Discovery Initiation */
#define PPPOE_CODE_PADO 0x07 /* Active Discovery Offer */
#define PPPOE_CODE_PADR 0x19 /* Active Discovery Request */
#define PPPOE_CODE_PADS 0x65 /* Active Discovery Session confirmation */
#define PPPOE_CODE_PADT 0xA7 /* Active Discovery Terminate */
/* two byte PPP protocol discriminator, then IP data */
#define PPPOE_MAXMTU (ETHERMTU - PPPOE_OVERHEAD)
/* Add a 16 bit unsigned value to a buffer pointed to by PTR */
#define PPPOE_ADD_16(PTR, VAL) \
*(PTR)++ = (VAL) / 256; \
*(PTR)++ = (VAL) % 256
/* Add a complete PPPoE header to the buffer pointed to by PTR */
#define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \
*(PTR)++ = PPPOE_VERTYPE; \
*(PTR)++ = (CODE); \
PPPOE_ADD_16(PTR, SESS); \
PPPOE_ADD_16(PTR, LEN)
#define PPPOE_DISC_TIMEOUT (hz*5) /* base for quick timeout calculation */
#define PPPOE_SLOW_RETRY (hz*60) /* persistent retry interval */
#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */
#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */
#ifdef PPPOE_SERVER
/* from if_spppsubr.c */
#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
#endif
struct pppoe_softc {
struct sppp sc_sppp; /* contains a struct ifnet as first element */
LIST_ENTRY(pppoe_softc) sc_list;
struct ifnet *sc_eth_if; /* ethernet interface we are using */
int sc_state; /* discovery phase or session connected */
struct ether_addr sc_dest; /* hardware address of concentrator */
u_int16_t sc_session; /* PPPoE session id */
char *sc_service_name; /* if != NULL: requested name of service */
char *sc_concentrator_name; /* if != NULL: requested concentrator id */
u_int8_t *sc_ac_cookie; /* content of AC cookie we must echo back */
size_t sc_ac_cookie_len; /* length of cookie data */
#ifdef PPPOE_SERVER
u_int8_t *sc_hunique; /* content of host unique we must echo back */
size_t sc_hunique_len; /* length of host unique */
#endif
callout_t sc_timeout; /* timeout while not in session state */
int sc_padi_retried; /* number of PADI retries already done */
int sc_padr_retried; /* number of PADR retries already done */
};
/* incoming traffic will be queued here */
struct ifqueue ppoediscinq = { .ifq_maxlen = IFQ_MAXLEN };
struct ifqueue ppoeinq = { .ifq_maxlen = IFQ_MAXLEN };
void *pppoe_softintr = NULL;
static void pppoe_softintr_handler(void *);
extern int sppp_ioctl(struct ifnet *, unsigned long, void *);
/* input routines */
static void pppoe_input(void);
static void pppoe_disc_input(struct mbuf *);
static void pppoe_dispatch_disc_pkt(struct mbuf *, int);
static void pppoe_data_input(struct mbuf *);
/* management routines */
void pppoeattach(int);
static int pppoe_connect(struct pppoe_softc *);
static int pppoe_disconnect(struct pppoe_softc *);
static void pppoe_abort_connect(struct pppoe_softc *);
static int pppoe_ioctl(struct ifnet *, unsigned long, void *);
static void pppoe_tls(struct sppp *);
static void pppoe_tlf(struct sppp *);
static void pppoe_start(struct ifnet *);
static void pppoe_clear_softc(struct pppoe_softc *, const char *);
/* internal timeout handling */
static void pppoe_timeout(void *);
/* sending actual protocol controll packets */
static int pppoe_send_padi(struct pppoe_softc *);
static int pppoe_send_padr(struct pppoe_softc *);
#ifdef PPPOE_SERVER
static int pppoe_send_pado(struct pppoe_softc *);
static int pppoe_send_pads(struct pppoe_softc *);
#endif
static int pppoe_send_padt(struct ifnet *, u_int, const u_int8_t *);
/* raw output */
static int pppoe_output(struct pppoe_softc *, struct mbuf *);
/* internal helper functions */
static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct ifnet *);
static struct pppoe_softc * pppoe_find_softc_by_hunique(u_int8_t *, size_t, struct ifnet *);
static struct mbuf *pppoe_get_mbuf(size_t len);
#ifdef PFIL_HOOKS
static int pppoe_ifattach_hook(void *, struct mbuf **, struct ifnet *, int);
#endif
static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
static int pppoe_clone_create(struct if_clone *, int);
static int pppoe_clone_destroy(struct ifnet *);
static struct if_clone pppoe_cloner =
IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy);
/* ARGSUSED */
void
pppoeattach(int count)
{
LIST_INIT(&pppoe_softc_list);
if_clone_attach(&pppoe_cloner);
pppoe_softintr = softint_establish(SOFTINT_NET, pppoe_softintr_handler, NULL);
}
static int
pppoe_clone_create(struct if_clone *ifc, int unit)
{
struct pppoe_softc *sc;
sc = malloc(sizeof(struct pppoe_softc), M_DEVBUF, M_WAITOK);
memset(sc, 0, sizeof(struct pppoe_softc));
snprintf(sc->sc_sppp.pp_if.if_xname, sizeof(sc->sc_sppp.pp_if.if_xname),
"pppoe%d", unit);
sc->sc_sppp.pp_if.if_softc = sc;
sc->sc_sppp.pp_if.if_mtu = PPPOE_MAXMTU;
sc->sc_sppp.pp_if.if_flags = IFF_SIMPLEX|IFF_POINTOPOINT|IFF_MULTICAST;
sc->sc_sppp.pp_if.if_type = IFT_PPP;
sc->sc_sppp.pp_if.if_hdrlen = sizeof(struct ether_header) + PPPOE_HEADERLEN;
sc->sc_sppp.pp_if.if_dlt = DLT_PPP_ETHER;
sc->sc_sppp.pp_flags |= PP_KEEPALIVE | /* use LCP keepalive */
PP_NOFRAMING; /* no serial encapsulation */
sc->sc_sppp.pp_if.if_ioctl = pppoe_ioctl;
IFQ_SET_MAXLEN(&sc->sc_sppp.pp_if.if_snd, IFQ_MAXLEN);
IFQ_SET_READY(&sc->sc_sppp.pp_if.if_snd);
/* changed to real address later */
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
callout_init(&sc->sc_timeout, 0);
sc->sc_sppp.pp_if.if_start = pppoe_start;
sc->sc_sppp.pp_tls = pppoe_tls;
sc->sc_sppp.pp_tlf = pppoe_tlf;
sc->sc_sppp.pp_framebytes = PPPOE_HEADERLEN; /* framing added to ppp packets */
if_attach(&sc->sc_sppp.pp_if);
sppp_attach(&sc->sc_sppp.pp_if);
#if NBPFILTER > 0
bpfattach(&sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0);
#endif
#ifdef PFIL_HOOKS
if (LIST_EMPTY(&pppoe_softc_list))
pfil_add_hook(pppoe_ifattach_hook, NULL,
PFIL_IFNET|PFIL_WAITOK, &if_pfil);
#endif
LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
return 0;
}
static int
pppoe_clone_destroy(struct ifnet *ifp)
{
struct pppoe_softc * sc = ifp->if_softc;
callout_stop(&sc->sc_timeout);
LIST_REMOVE(sc, sc_list);
#ifdef PFIL_HOOKS
if (LIST_EMPTY(&pppoe_softc_list))
pfil_remove_hook(pppoe_ifattach_hook, NULL,
PFIL_IFNET|PFIL_WAITOK, &if_pfil);
#endif
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
sppp_detach(&sc->sc_sppp.pp_if);
if_detach(ifp);
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF);
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF);
if (sc->sc_ac_cookie)
free(sc->sc_ac_cookie, M_DEVBUF);
callout_destroy(&sc->sc_timeout);
free(sc, M_DEVBUF);
return (0);
}
/*
* Find the interface handling the specified session.
* Note: O(number of sessions open), this is a client-side only, mean
* and lean implementation, so number of open sessions typically should
* be 1.
*/
static struct pppoe_softc *
pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif)
{
struct pppoe_softc *sc;
if (session == 0)
return NULL;
LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
if (sc->sc_state == PPPOE_STATE_SESSION
&& sc->sc_session == session) {
if (sc->sc_eth_if == rcvif)
return sc;
else
return NULL;
}
}
return NULL;
}
/* Check host unique token passed and return appropriate softc pointer,
* or NULL if token is bogus. */
static struct pppoe_softc *
pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif)
{
struct pppoe_softc *sc, *t;
if (LIST_EMPTY(&pppoe_softc_list))
return NULL;
if (len != sizeof sc)
return NULL;
memcpy(&t, token, len);
LIST_FOREACH(sc, &pppoe_softc_list, sc_list)
if (sc == t) break;
if (sc == NULL) {
#ifdef PPPOE_DEBUG
printf("pppoe: alien host unique tag, no session found\n");
#endif
return NULL;
}
/* should be safe to access *sc now */
if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
printf("%s: host unique tag found, but it belongs to a connection in state %d\n",
sc->sc_sppp.pp_if.if_xname, sc->sc_state);
return NULL;
}
if (sc->sc_eth_if != rcvif) {
printf("%s: wrong interface, not accepting host unique\n",
sc->sc_sppp.pp_if.if_xname);
return NULL;
}
return sc;
}
static void
pppoe_softintr_handler(void *dummy)
{
/* called at splsoftnet() */
pppoe_input();
}
/* called at appropriate protection level */
static void
pppoe_input(void)
{
struct mbuf *m;
int s, disc_done, data_done;
do {
disc_done = 0;
data_done = 0;
for (;;) {
s = splnet();
IF_DEQUEUE(&ppoediscinq, m);
splx(s);
if (m == NULL) break;
disc_done = 1;
pppoe_disc_input(m);
}
for (;;) {
s = splnet();
IF_DEQUEUE(&ppoeinq, m);
splx(s);
if (m == NULL) break;
data_done = 1;
pppoe_data_input(m);
}
} while (disc_done || data_done);
}
/* analyze and handle a single received packet while not in session state */
static void
pppoe_dispatch_disc_pkt(struct mbuf *m, int off)
{
u_int16_t tag, len;
u_int16_t session, plen;
struct pppoe_softc *sc;
const char *err_msg, *devname;
char *error;
u_int8_t *ac_cookie;
size_t ac_cookie_len;
#ifdef PPPOE_SERVER
u_int8_t *hunique;
size_t hunique_len;
#endif
struct pppoehdr *ph;
struct pppoetag *pt;
struct mbuf *n;
int noff, err, errortag;
struct ether_header *eh;
devname = "pppoe"; /* as long as we don't know which instance */
err_msg = NULL;
errortag = 0;
if (m->m_len < sizeof(*eh)) {
m = m_pullup(m, sizeof(*eh));
if (!m)
goto done;
}
eh = mtod(m, struct ether_header *);
off += sizeof(*eh);
ac_cookie = NULL;
ac_cookie_len = 0;
#ifdef PPPOE_SERVER
hunique = NULL;
hunique_len = 0;
#endif
session = 0;
if (m->m_pkthdr.len - off <= PPPOE_HEADERLEN) {
printf("pppoe: packet too short: %d\n", m->m_pkthdr.len);
goto done;
}
n = m_pulldown(m, off, sizeof(*ph), &noff);
if (!n) {
printf("pppoe: could not get PPPoE header\n");
m = NULL;
goto done;
}
ph = (struct pppoehdr *)(mtod(n, char *) + noff);
if (ph->vertype != PPPOE_VERTYPE) {
printf("pppoe: unknown version/type packet: 0x%x\n",
ph->vertype);
goto done;
}
session = ntohs(ph->session);
plen = ntohs(ph->plen);
off += sizeof(*ph);
if (plen + off > m->m_pkthdr.len) {
printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
m->m_pkthdr.len - off, plen);
goto done;
}
m_adj(m, off + plen - m->m_pkthdr.len); /* ignore trailing garbage */
tag = 0;
len = 0;
sc = NULL;
while (off + sizeof(*pt) <= m->m_pkthdr.len) {
n = m_pulldown(m, off, sizeof(*pt), &noff);
if (!n) {
printf("%s: parse error\n", devname);
m = NULL;
goto done;
}
pt = (struct pppoetag *)(mtod(n, char *) + noff);
tag = ntohs(pt->tag);
len = ntohs(pt->len);
if (off + len > m->m_pkthdr.len) {
printf("pppoe: tag 0x%x len 0x%x is too long\n",
tag, len);
goto done;
}
switch (tag) {
case PPPOE_TAG_EOL:
goto breakbreak;
case PPPOE_TAG_SNAME:
break; /* ignored */
case PPPOE_TAG_ACNAME:
error = NULL;
if (sc != NULL && len > 0) {
error = malloc(len+1, M_TEMP, M_NOWAIT);
if (error) {
n = m_pulldown(m, off + sizeof(*pt),
len, &noff);
if (n) {
strncpy(error,
mtod(n, char*) + noff,
len);
error[len] = '\0';
}
printf("%s: connected to %s\n",
devname, error);
free(error, M_TEMP);
}
}
break; /* ignored */
case PPPOE_TAG_HUNIQUE:
if (sc != NULL)
break;
n = m_pulldown(m, off + sizeof(*pt), len, &noff);
if (!n) {
m = NULL;
err_msg = "TAG HUNIQUE ERROR";
break;
}
#ifdef PPPOE_SERVER
hunique = mtod(n, u_int8_t *) + noff;
hunique_len = len;
#endif
sc = pppoe_find_softc_by_hunique(mtod(n, char *) + noff,
len, m->m_pkthdr.rcvif);
if (sc != NULL)
devname = sc->sc_sppp.pp_if.if_xname;
break;
case PPPOE_TAG_ACCOOKIE:
if (ac_cookie == NULL) {
n = m_pulldown(m, off + sizeof(*pt), len,
&noff);
if (!n) {
err_msg = "TAG ACCOOKIE ERROR";
m = NULL;
break;
}
ac_cookie = mtod(n, char *) + noff;
ac_cookie_len = len;
}
break;
case PPPOE_TAG_SNAME_ERR:
err_msg = "SERVICE NAME ERROR";
errortag = 1;
break;
case PPPOE_TAG_ACSYS_ERR:
err_msg = "AC SYSTEM ERROR";
errortag = 1;
break;
case PPPOE_TAG_GENERIC_ERR:
err_msg = "GENERIC ERROR";
errortag = 1;
break;
}
if (err_msg) {
error = NULL;
if (errortag && len) {
error = malloc(len+1, M_TEMP, M_NOWAIT);
n = m_pulldown(m, off + sizeof(*pt), len,
&noff);
if (n && error) {
strncpy(error,
mtod(n, char *) + noff, len);
error[len] = '\0';
}
}
if (error) {
printf("%s: %s: %s\n", devname,
err_msg, error);
free(error, M_TEMP);
} else
printf("%s: %s\n", devname, err_msg);
if (errortag)
goto done;
}
off += sizeof(*pt) + len;
}
breakbreak:;
switch (ph->code) {
case PPPOE_CODE_PADI:
#ifdef PPPOE_SERVER
/*
* got service name, concentrator name, and/or host unique.
* ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
*/
if (LIST_EMPTY(&pppoe_softc_list))
goto done;
LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP))
continue;
if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE))
continue;
if (sc->sc_state == PPPOE_STATE_INITIAL)
break;
}
if (sc == NULL) {
/* printf("pppoe: free passive interface is not found\n");*/
goto done;
}
if (hunique) {
if (sc->sc_hunique)
free(sc->sc_hunique, M_DEVBUF);
sc->sc_hunique = malloc(hunique_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_hunique == NULL)
goto done;
sc->sc_hunique_len = hunique_len;
memcpy(sc->sc_hunique, hunique, hunique_len);
}
memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
sc->sc_state = PPPOE_STATE_PADO_SENT;
pppoe_send_pado(sc);
break;
#endif /* PPPOE_SERVER */
case PPPOE_CODE_PADR:
#ifdef PPPOE_SERVER
/*
* get sc from ac_cookie if IFF_PASSIVE
*/
if (ac_cookie == NULL) {
/* be quiet if there is not a single pppoe instance */
printf("pppoe: received PADR but not includes ac_cookie\n");
goto done;
}
sc = pppoe_find_softc_by_hunique(ac_cookie,
ac_cookie_len,
m->m_pkthdr.rcvif);
if (sc == NULL) {
/* be quiet if there is not a single pppoe instance */
if (!LIST_EMPTY(&pppoe_softc_list))
printf("pppoe: received PADR but could not find request for it\n");
goto done;
}
if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
printf("%s: received unexpected PADR\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
if (hunique) {
if (sc->sc_hunique)
free(sc->sc_hunique, M_DEVBUF);
sc->sc_hunique = malloc(hunique_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_hunique == NULL)
goto done;
sc->sc_hunique_len = hunique_len;
memcpy(sc->sc_hunique, hunique, hunique_len);
}
pppoe_send_pads(sc);
sc->sc_state = PPPOE_STATE_SESSION;
sc->sc_sppp.pp_up(&sc->sc_sppp);
break;
#else
/* ignore, we are no access concentrator */
goto done;
#endif /* PPPOE_SERVER */
case PPPOE_CODE_PADO:
if (sc == NULL) {
/* be quiet if there is not a single pppoe instance */
if (!LIST_EMPTY(&pppoe_softc_list))
printf("pppoe: received PADO but could not find request for it\n");
goto done;
}
if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
printf("%s: received unexpected PADO\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
if (ac_cookie) {
if (sc->sc_ac_cookie)
free(sc->sc_ac_cookie, M_DEVBUF);
sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_ac_cookie == NULL)
goto done;
sc->sc_ac_cookie_len = ac_cookie_len;
memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
}
memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
callout_stop(&sc->sc_timeout);
sc->sc_padr_retried = 0;
sc->sc_state = PPPOE_STATE_PADR_SENT;
if ((err = pppoe_send_padr(sc)) != 0) {
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to send PADR, "
"error=%d\n", sc->sc_sppp.pp_if.if_xname,
err);
}
callout_reset(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried),
pppoe_timeout, sc);
break;
case PPPOE_CODE_PADS:
if (sc == NULL)
goto done;
sc->sc_session = session;
callout_stop(&sc->sc_timeout);
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: session 0x%x connected\n",
sc->sc_sppp.pp_if.if_xname, session);
sc->sc_state = PPPOE_STATE_SESSION;
sc->sc_sppp.pp_up(&sc->sc_sppp); /* notify upper layers */
break;
case PPPOE_CODE_PADT:
if (sc == NULL)
goto done;
pppoe_clear_softc(sc, "received PADT");
break;
default:
printf("%s: unknown code (0x%04x) session = 0x%04x\n",
sc? sc->sc_sppp.pp_if.if_xname : "pppoe",
ph->code, session);
break;
}
done:
if (m)
m_freem(m);
return;
}
static void
pppoe_disc_input(struct mbuf *m)
{
/* avoid error messages if there is not a single pppoe instance */
if (!LIST_EMPTY(&pppoe_softc_list)) {
KASSERT(m->m_flags & M_PKTHDR);
pppoe_dispatch_disc_pkt(m, 0);
} else
m_freem(m);
}
static void
pppoe_data_input(struct mbuf *m)
{
u_int16_t session, plen;
struct pppoe_softc *sc;
struct pppoehdr *ph;
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
u_int8_t shost[ETHER_ADDR_LEN];
#endif
KASSERT(m->m_flags & M_PKTHDR);
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
memcpy(shost, mtod(m, struct ether_header*)->ether_shost, ETHER_ADDR_LEN);
#endif
m_adj(m, sizeof(struct ether_header));
if (m->m_pkthdr.len <= PPPOE_HEADERLEN) {
printf("pppoe (data): dropping too short packet: %d bytes\n",
m->m_pkthdr.len);
goto drop;
}
if (m->m_len < sizeof(*ph)) {
m = m_pullup(m, sizeof(*ph));
if (!m) {
printf("pppoe: could not get PPPoE header\n");
return;
}
}
ph = mtod(m, struct pppoehdr *);
if (ph->vertype != PPPOE_VERTYPE) {
printf("pppoe (data): unknown version/type packet: 0x%x\n",
ph->vertype);
goto drop;
}
if (ph->code != 0)
goto drop;
session = ntohs(ph->session);
sc = pppoe_find_softc_by_session(session, m->m_pkthdr.rcvif);
if (sc == NULL) {
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
printf("pppoe: input for unknown session 0x%x, sending PADT\n",
session);
pppoe_send_padt(m->m_pkthdr.rcvif, session, shost);
#endif
goto drop;
}
plen = ntohs(ph->plen);
#if NBPFILTER > 0
if(sc->sc_sppp.pp_if.if_bpf)
bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m);
#endif
m_adj(m, PPPOE_HEADERLEN);
#ifdef PPPOE_DEBUG
{
struct mbuf *p;
printf("%s: pkthdr.len=%d, pppoe.len=%d",
sc->sc_sppp.pp_if.if_xname,
m->m_pkthdr.len, plen);
p = m;
while (p) {
printf(" l=%d", p->m_len);
p = p->m_next;
}
printf("\n");
}
#endif
if (m->m_pkthdr.len < plen)
goto drop;
/* fix incoming interface pointer (not the raw ethernet interface anymore) */
m->m_pkthdr.rcvif = &sc->sc_sppp.pp_if;
/* pass packet up and account for it */
sc->sc_sppp.pp_if.if_ipackets++;
sppp_input(&sc->sc_sppp.pp_if, m);
return;
drop:
m_freem(m);
}
static int
pppoe_output(struct pppoe_softc *sc, struct mbuf *m)
{
struct sockaddr dst;
struct ether_header *eh;
u_int16_t etype;
if (sc->sc_eth_if == NULL) {
m_freem(m);
return EIO;
}
memset(&dst, 0, sizeof dst);
dst.sa_family = AF_UNSPEC;
eh = (struct ether_header*)&dst.sa_data;
etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHERTYPE_PPPOE : ETHERTYPE_PPPOEDISC;
eh->ether_type = htons(etype);
memcpy(&eh->ether_dhost, &sc->sc_dest, sizeof sc->sc_dest);
#ifdef PPPOE_DEBUG
printf("%s (%x) state=%d, session=0x%x output -> %s, len=%d\n",
sc->sc_sppp.pp_if.if_xname, etype,
sc->sc_state, sc->sc_session,
ether_sprintf((const unsigned char *)&sc->sc_dest), m->m_pkthdr.len);
#endif
m->m_flags &= ~(M_BCAST|M_MCAST);
sc->sc_sppp.pp_if.if_opackets++;
return sc->sc_eth_if->if_output(sc->sc_eth_if, m, &dst, NULL);
}
static int
pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, void *data)
{
struct lwp *l = curlwp; /* XXX */
struct pppoe_softc *sc = (struct pppoe_softc*)ifp;
int error = 0;
switch (cmd) {
case PPPOESETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms*)data;
if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
NULL) != 0)
return (EPERM);
if (parms->eth_ifname[0] != 0) {
struct ifnet *eth_if;
eth_if = ifunit(parms->eth_ifname);
if (eth_if == NULL || eth_if->if_dlt != DLT_EN10MB) {
sc->sc_eth_if = NULL;
return ENXIO;
}
if (sc->sc_sppp.pp_if.if_mtu >
eth_if->if_mtu - PPPOE_OVERHEAD) {
sc->sc_sppp.pp_if.if_mtu = eth_if->if_mtu -
PPPOE_OVERHEAD;
}
sc->sc_eth_if = eth_if;
}
if (parms->ac_name != NULL) {
size_t s;
char *b = malloc(parms->ac_name_len + 1, M_DEVBUF,
M_WAITOK);
if (b == NULL)
return ENOMEM;
error = copyinstr(parms->ac_name, b,
parms->ac_name_len+1, &s);
if (error != 0) {
free(b, M_DEVBUF);
return error;
}
if (s != parms->ac_name_len+1) {
free(b, M_DEVBUF);
return EINVAL;
}
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF);
sc->sc_concentrator_name = b;
}
if (parms->service_name != NULL) {
size_t s;
char *b = malloc(parms->service_name_len + 1, M_DEVBUF,
M_WAITOK);
if (b == NULL)
return ENOMEM;
error = copyinstr(parms->service_name, b,
parms->service_name_len+1, &s);
if (error != 0) {
free(b, M_DEVBUF);
return error;
}
if (s != parms->service_name_len+1) {
free(b, M_DEVBUF);
return EINVAL;
}
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF);
sc->sc_service_name = b;
}
return 0;
}
break;
case PPPOEGETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms*)data;
memset(parms, 0, sizeof *parms);
if (sc->sc_eth_if)
strncpy(parms->ifname, sc->sc_eth_if->if_xname, IFNAMSIZ);
return 0;
}
break;
case PPPOEGETSESSION:
{
struct pppoeconnectionstate *state = (struct pppoeconnectionstate*)data;
state->state = sc->sc_state;
state->session_id = sc->sc_session;
state->padi_retry_no = sc->sc_padi_retried;
state->padr_retry_no = sc->sc_padr_retried;
return 0;
}
break;
case SIOCSIFFLAGS:
{
struct ifreq *ifr = (struct ifreq*) data;
/*
* Prevent running re-establishment timers overriding
* administrators choice.
*/
if ((ifr->ifr_flags & IFF_UP) == 0
&& sc->sc_state >= PPPOE_STATE_PADI_SENT
&& sc->sc_state < PPPOE_STATE_SESSION) {
callout_stop(&sc->sc_timeout);
sc->sc_state = PPPOE_STATE_INITIAL;
sc->sc_padi_retried = 0;
sc->sc_padr_retried = 0;
memcpy(&sc->sc_dest, etherbroadcastaddr,
sizeof(sc->sc_dest));
}
return sppp_ioctl(ifp, cmd, data);
}
case SIOCSIFMTU:
{
struct ifreq *ifr = (struct ifreq *)data;
if (ifr->ifr_mtu > (sc->sc_eth_if == NULL ?
PPPOE_MAXMTU : (sc->sc_eth_if->if_mtu - PPPOE_OVERHEAD))) {
return EINVAL;
}
return sppp_ioctl(ifp, cmd, data);
}
default:
return sppp_ioctl(ifp, cmd, data);
}
return 0;
}
/*
* Allocate a mbuf/cluster with space to store the given data length
* of payload, leaving space for prepending an ethernet header
* in front.
*/
static struct mbuf *
pppoe_get_mbuf(size_t len)
{
struct mbuf *m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return NULL;
if (len + sizeof(struct ether_header) > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
struct mbuf *n;
MFREE(m, n);
return 0;
}
}
m->m_data += sizeof(struct ether_header);