forked from kamailio/kamailio
-
Notifications
You must be signed in to change notification settings - Fork 1
/
dst_blacklist.c
1204 lines (1046 loc) · 29.1 KB
/
dst_blacklist.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
/*
* $Id$
*
* resolver related functions
*
* Copyright (C) 2006 iptelorg GmbH
*
* This file is part of ser, a free SIP server.
*
* ser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* History:
* --------
* 2006-07-29 created by andrei
* 2007-05-39 added hooks for add; more locks to reduce contention (andrei)
* 2007-06-26 added hooks for search (andrei)
* 2007-07-30 added dst_blacklist_del() and dst_blacklist_add_to() (andrei)
* 2007-07-30 dst blacklist measurements added (Gergo)
* 2008-02-11 dns_blacklist_init cfg parameter is introduced (Miklos)
* 2009-02-26 added dst_blacklist_su* variant (andrei)
*/
/*!
* \file
* \brief SIP-router core ::
* \ingroup core
* Module: \ref core
*/
#ifdef USE_DST_BLACKLIST
#include "dst_blacklist.h"
#include "globals.h"
#include "cfg_core.h"
#include "mem/shm_mem.h"
#include "hashes.h"
#include "locking.h"
#include "timer.h"
#include "timer_ticks.h"
#include "ip_addr.h"
#include "error.h"
#include "rpc.h"
#include "compiler_opt.h"
#include "resolve.h" /* for str2ip */
#ifdef USE_DST_BLACKLIST_STATS
#include "pt.h"
#endif
struct dst_blst_entry{
struct dst_blst_entry* next;
ticks_t expire;
unsigned short port;
unsigned char proto;
unsigned char flags; /* contains the address type + error flags */
unsigned char ip[4]; /* 4 for ipv4, 16 for ipv6 */
};
#define DST_BLST_ENTRY_SIZE(b) \
(sizeof(struct dst_blst_entry)+((b).flags&BLST_IS_IPV6)*12)
#define DST_BLST_HASH_SIZE 1024
#define DEFAULT_BLST_TIMER_INTERVAL 60 /* 1 min */
/* lock method */
#ifdef GEN_LOCK_T_UNLIMITED
#define BLST_LOCK_PER_BUCKET
#elif defined GEN_LOCK_SET_T_UNLIMITED
#define BLST_LOCK_SET
#else
#define BLST_ONE_LOCK
#endif
#ifdef BLST_LOCK_PER_BUCKET
/* lock included in the hash bucket */
#define LOCK_BLST(h) lock_get(&dst_blst_hash[(h)].lock)
#define UNLOCK_BLST(h) lock_release(&dst_blst_hash[(h)].lock)
#elif defined BLST_LOCK_SET
static gen_lock_set_t* blst_lock_set=0;
#define LOCK_BLST(h) lock_set_get(blst_lock_set, (h))
#define UNLOCK_BLST(h) lock_set_release(blst_lock_set, (h))
#else
/* use only one lock */
static gen_lock_t* blst_lock=0;
#define LOCK_BLST(h) lock_get(blst_lock)
#define UNLOCK_BLST(h) lock_release(blst_lock)
#endif
#define BLST_HASH_STATS
#ifdef BLST_HASH_STATS
#define BLST_HASH_STATS_DEC(h) dst_blst_hash[(h)].entries--
#define BLST_HASH_STATS_INC(h) dst_blst_hash[(h)].entries++
#else
#define BLST_HASH_STATS_DEC(h) do{}while(0)
#define BLST_HASH_STATS_INC(h) do{}while(0)
#endif
struct dst_blst_lst_head{
struct dst_blst_entry* first;
#ifdef BLST_LOCK_PER_BUCKET
gen_lock_t lock;
#endif
#ifdef BLST_HASH_STATS
unsigned int entries;
#endif
};
int dst_blacklist_init=1; /* if 0, the dst blacklist is not initialized at startup */
static struct timer_ln* blst_timer_h=0;
static volatile unsigned int* blst_mem_used=0;
unsigned int blst_timer_interval=DEFAULT_BLST_TIMER_INTERVAL;
struct dst_blst_lst_head* dst_blst_hash=0;
#ifdef USE_DST_BLACKLIST_STATS
struct t_dst_blacklist_stats* dst_blacklist_stats=0;
#endif
/* blacklist per protocol event ignore mask array */
unsigned blst_proto_imask[PROTO_LAST+1];
#ifdef DST_BLACKLIST_HOOKS
/* there 2 types of callbacks supported: on add new entry to the blacklist
* (DST_BLACKLIST_ADD_CB) and on blacklist search (DST_BLACKLIST_SEARCH_CB).
* Both of them take a struct dest_info*, a flags pointer(unsigned char*),
* and a struct sip_msg* as parameters. The flags can be changed.
* A callback should return one of:
* DST_BLACKLIST_CONTINUE - do nothing, let other callbacks run
* DST_BLACKLIST_ACCEPT - for blacklist add: force accept immediately,
* for blacklist search: force match and use
* the flags as the blacklist search return.
* ( so the flags should be set to some valid
* non zero BLST flags value )
* DST_BLACKLIST_DENY - for blacklist add: don't allow adding the
* destination to the blacklist.
* for blacklist search: force return not found
*/
#define MAX_BLST_HOOKS 1
struct blst_callbacks_lst{
struct blacklist_hook* hooks;
unsigned int max_hooks;
int last_idx;
};
static struct blst_callbacks_lst blst_add_cb;
static struct blst_callbacks_lst blst_search_cb;
static int init_blst_callback_lst(struct blst_callbacks_lst* cb_lst, int max)
{
cb_lst->max_hooks=MAX_BLST_HOOKS;
cb_lst->last_idx=0;
cb_lst->hooks=pkg_malloc(cb_lst->max_hooks*sizeof(struct blacklist_hook));
if (cb_lst->hooks==0)
goto error;
memset(cb_lst->hooks, 0, cb_lst->max_hooks*sizeof(struct blacklist_hook));
return 0;
error:
return -1;
}
static void destroy_blst_callback_lst(struct blst_callbacks_lst* cb_lst)
{
int r;
if (cb_lst && cb_lst->hooks){
for (r=0; r<cb_lst->last_idx; r++){
if (cb_lst->hooks[r].destroy)
cb_lst->hooks[r].destroy();
}
pkg_free(cb_lst->hooks);
cb_lst->hooks=0;
cb_lst->last_idx=0;
cb_lst->max_hooks=0;
}
}
static void destroy_blacklist_hooks()
{
destroy_blst_callback_lst(&blst_add_cb);
destroy_blst_callback_lst(&blst_search_cb);
}
static int init_blacklist_hooks()
{
if (init_blst_callback_lst(&blst_add_cb, MAX_BLST_HOOKS)!=0)
goto error;
if (init_blst_callback_lst(&blst_search_cb, MAX_BLST_HOOKS)!=0)
goto error;
return 0;
error:
LOG(L_ERR, "blacklist_hooks: failure initializing internal lists\n");
destroy_blacklist_hooks();
return -1;
}
/* allocates a new hook
* returns 0 on success and -1 on error
* must be called from mod init (from the main process, before forking)*/
int register_blacklist_hook(struct blacklist_hook *h, int type)
{
struct blst_callbacks_lst* cb_lst;
struct blacklist_hook* tmp;
int new_max_hooks;
if (dst_blacklist_init==0) {
LOG(L_ERR, "register_blacklist_hook: blacklist is turned off, "
"the hook cannot be registered\n");
goto error;
}
switch(type){
case DST_BLACKLIST_ADD_CB:
cb_lst=&blst_add_cb;
break;
case DST_BLACKLIST_SEARCH_CB:
cb_lst=&blst_search_cb;
break;
default:
BUG("register_blacklist_hook: invalid type %d\n", type);
goto error;
}
if (cb_lst==0 || cb_lst->hooks==0 || cb_lst->max_hooks==0){
BUG("register_blacklist_hook: intialization error\n");
goto error;
}
if (cb_lst->last_idx >= cb_lst->max_hooks){
new_max_hooks=2*cb_lst->max_hooks;
tmp=pkg_realloc(cb_lst->hooks,
new_max_hooks*sizeof(struct blacklist_hook));
if (tmp==0){
goto error;
}
cb_lst->hooks=tmp;
/* init the new chunk (but not the current entry which is
* overwritten anyway) */
memset(&cb_lst->hooks[cb_lst->max_hooks+1], 0,
(new_max_hooks-cb_lst->max_hooks-1)*
sizeof(struct blacklist_hook));
cb_lst->max_hooks=new_max_hooks;
}
cb_lst->hooks[cb_lst->last_idx]=*h;
cb_lst->last_idx++;
return 0;
error:
return -1;
}
inline static int blacklist_run_hooks(struct blst_callbacks_lst *cb_lst,
struct dest_info* si, unsigned char* flags,
struct sip_msg* msg)
{
int r;
int ret;
ret=DST_BLACKLIST_CONTINUE; /* default, if no hook installed accept
blacklist operation */
if (likely(cb_lst->last_idx==0))
return ret;
for (r=0; r<cb_lst->last_idx; r++){
ret=cb_lst->hooks[r].on_blst_action(si, flags, msg);
if (ret!=DST_BLACKLIST_CONTINUE) break;
}
return ret;
}
#endif /* DST_BLACKLIST_HOOKS */
/** init per protocol blacklist event ignore masks.
* @return 0 on success, < 0 on error.
*/
int blst_init_ign_masks(void)
{
if ((PROTO_UDP > PROTO_LAST) || (PROTO_TCP > PROTO_LAST) ||
(PROTO_TLS > PROTO_LAST) || (PROTO_SCTP > PROTO_LAST)){
BUG("protocol array too small\n");
return -1;
}
blst_proto_imask[PROTO_UDP]=cfg_get(core, core_cfg, blst_udp_imask);
blst_proto_imask[PROTO_TCP]=cfg_get(core, core_cfg, blst_tcp_imask);
blst_proto_imask[PROTO_TLS]=cfg_get(core, core_cfg, blst_tls_imask);
blst_proto_imask[PROTO_SCTP]=cfg_get(core, core_cfg, blst_sctp_imask);
blst_proto_imask[PROTO_NONE]=blst_proto_imask[PROTO_UDP];
return 0;
}
inline static void blst_destroy_entry(struct dst_blst_entry* e)
{
shm_free(e);
}
static ticks_t blst_timer(ticks_t ticks, struct timer_ln* tl, void* data);
inline static void dst_blst_entry2ip(struct ip_addr* ip,
struct dst_blst_entry* e)
{
if (e->flags & BLST_IS_IPV6){
ip->af=AF_INET6;
ip->len=16;
}else
{
ip->af=AF_INET;
ip->len=4;
}
memcpy(ip->u.addr, e->ip, ip->len);
}
inline static unsigned short dst_blst_hash_no(unsigned char proto,
struct ip_addr* ip,
unsigned short port)
{
str s1;
str s2;
s1.s=(char*)ip->u.addr;
s1.len=ip->len;
s2.s=(char*)&port;
s2.len=sizeof(unsigned short);
return get_hash2_raw(&s1, &s2)%DST_BLST_HASH_SIZE;
}
void destroy_dst_blacklist()
{
int r;
struct dst_blst_entry** crt;
struct dst_blst_entry* e;
if (blst_timer_h){
timer_del(blst_timer_h);
timer_free(blst_timer_h);
blst_timer_h=0;
}
#ifdef BLST_LOCK_PER_BUCKET
if (dst_blst_hash)
for(r=0; r<DST_BLST_HASH_SIZE; r++)
lock_destroy(&dst_blst_hash[r].lock);
#elif defined BLST_LOCK_SET
if (blst_lock_set){
lock_set_destroy(blst_lock_set);
lock_set_dealloc(blst_lock_set);
blst_lock_set=0;
}
#else
if (blst_lock){
lock_destroy(blst_lock);
lock_dealloc(blst_lock);
blst_lock=0;
}
#endif
if (dst_blst_hash){
for(r=0; r<DST_BLST_HASH_SIZE; r++){
crt=&dst_blst_hash[r].first;
while(*crt){
e=*crt;
*crt=(*crt)->next;
blst_destroy_entry(e);
}
}
shm_free(dst_blst_hash);
dst_blst_hash=0;
}
if (blst_mem_used){
shm_free((void*)blst_mem_used);
blst_mem_used=0;
}
#ifdef DST_BLACKLIST_HOOKS
destroy_blacklist_hooks();
#endif
#ifdef USE_DST_BLACKLIST_STATS
if (dst_blacklist_stats)
shm_free(dst_blacklist_stats);
#endif
}
int init_dst_blacklist()
{
int ret;
#ifdef BLST_LOCK_PER_BUCKET
int r;
#endif
if (dst_blacklist_init==0) {
/* the dst blacklist is turned off */
default_core_cfg.use_dst_blacklist=0;
return 0;
}
ret=-1;
#ifdef DST_BLACKLIST_HOOKS
if (init_blacklist_hooks()!=0){
ret=E_OUT_OF_MEM;
goto error;
}
#endif
blst_mem_used=shm_malloc(sizeof(*blst_mem_used));
if (blst_mem_used==0){
ret=E_OUT_OF_MEM;
goto error;
}
*blst_mem_used=0;
dst_blst_hash=shm_malloc(sizeof(struct dst_blst_lst_head) *
DST_BLST_HASH_SIZE);
if (dst_blst_hash==0){
ret=E_OUT_OF_MEM;
goto error;
}
memset(dst_blst_hash, 0, sizeof(struct dst_blst_lst_head) *
DST_BLST_HASH_SIZE);
#ifdef BLST_LOCK_PER_BUCKET
for (r=0; r<DST_BLST_HASH_SIZE; r++){
if (lock_init(&dst_blst_hash[r].lock)==0){
ret=-1;
goto error;
}
}
#elif defined BLST_LOCK_SET
blst_lock_set=lock_set_alloc(DST_BLST_HASH_SIZE);
if (blst_lock_set==0){
ret=E_OUT_OF_MEM;
goto error;
}
if (lock_set_init(blst_lock_set)==0){
lock_set_dealloc(blst_lock_set);
blst_lock_set=0;
ret=-1;
goto error;
}
#else /* BLST_ONE_LOCK */
blst_lock=lock_alloc();
if (blst_lock==0){
ret=E_OUT_OF_MEM;
goto error;
}
if (lock_init(blst_lock)==0){
lock_dealloc(blst_lock);
blst_lock=0;
ret=-1;
goto error;
}
#endif /* BLST*LOCK*/
blst_timer_h=timer_alloc();
if (blst_timer_h==0){
ret=E_OUT_OF_MEM;
goto error;
}
/* fix options */
default_core_cfg.blst_max_mem<<=10; /* in Kb */ /* TODO: test with 0 */
if (blst_timer_interval){
timer_init(blst_timer_h, blst_timer, 0 ,0); /* slow timer */
if (timer_add(blst_timer_h, S_TO_TICKS(blst_timer_interval))<0){
LOG(L_CRIT, "BUG: init_dst_blacklist: failed to add the timer\n");
timer_free(blst_timer_h);
blst_timer_h=0;
goto error;
}
}
if (blst_init_ign_masks() < 0){
ret=E_BUG;
goto error;
}
return 0;
error:
destroy_dst_blacklist();
return ret;
}
#ifdef USE_DST_BLACKLIST_STATS
int init_dst_blacklist_stats(int iproc_num)
{
/* do not initialize the stats array if the dst blacklist will not be used */
if (dst_blacklist_init==0) return 0;
/* if it is already initialized */
if (dst_blacklist_stats)
shm_free(dst_blacklist_stats);
dst_blacklist_stats=shm_malloc(sizeof(*dst_blacklist_stats) * iproc_num);
if (dst_blacklist_stats==0){
return E_OUT_OF_MEM;
}
memset(dst_blacklist_stats, 0, sizeof(*dst_blacklist_stats) * iproc_num);
return 0;
}
#endif
/* must be called with the lock held
* struct dst_blst_entry** head, struct dst_blst_entry* e */
#define dst_blacklist_lst_add(head, e)\
do{ \
(e)->next=*(head); \
*(head)=(e); \
}while(0)
/* must be called with the lock held
* returns a pointer to the blacklist entry if found, 0 otherwise
* it also deletes expired elements (expire<=now) as it searches
* proto==PROTO_NONE = wildcard */
inline static struct dst_blst_entry* _dst_blacklist_lst_find(
unsigned short hash,
struct ip_addr* ip,
unsigned char proto,
unsigned short port,
ticks_t now)
{
struct dst_blst_entry** crt;
struct dst_blst_entry** tmp;
struct dst_blst_entry* e;
struct dst_blst_entry** head;
unsigned char type;
head=&dst_blst_hash[hash].first;
type=(ip->af==AF_INET6)*BLST_IS_IPV6;
for (crt=head, tmp=&(*head)->next; *crt; crt=tmp, tmp=&(*crt)->next){
e=*crt;
prefetch_loc_r((*crt)->next, 1);
/* remove old expired entries */
if ((s_ticks_t)(now-(*crt)->expire)>=0){
*crt=(*crt)->next;
tmp=crt;
*blst_mem_used-=DST_BLST_ENTRY_SIZE(*e);
BLST_HASH_STATS_DEC(hash);
blst_destroy_entry(e);
}else if ((e->port==port) && ((e->flags & BLST_IS_IPV6)==type) &&
((e->proto==PROTO_NONE) || (proto==PROTO_NONE) ||
(e->proto==proto)) &&
(memcmp(ip->u.addr, e->ip, ip->len)==0)){
return e;
}
}
return 0;
}
/* must be called with the lock held
* returns 1 if a matching entry was deleted, 0 otherwise
* it also deletes expired elements (expire<=now) as it searches
* proto==PROTO_NONE = wildcard */
inline static int _dst_blacklist_del(
unsigned short hash,
struct ip_addr* ip,
unsigned char proto,
unsigned short port,
ticks_t now)
{
struct dst_blst_entry** crt;
struct dst_blst_entry** tmp;
struct dst_blst_entry* e;
struct dst_blst_entry** head;
unsigned char type;
head=&dst_blst_hash[hash].first;
type=(ip->af==AF_INET6)*BLST_IS_IPV6;
for (crt=head, tmp=&(*head)->next; *crt; crt=tmp, tmp=&(*crt)->next){
e=*crt;
prefetch_loc_r((*crt)->next, 1);
/* remove old expired entries */
if ((s_ticks_t)(now-(*crt)->expire)>=0){
*crt=(*crt)->next;
tmp=crt;
*blst_mem_used-=DST_BLST_ENTRY_SIZE(*e);
BLST_HASH_STATS_DEC(hash);
blst_destroy_entry(e);
}else if ((e->port==port) && ((e->flags & BLST_IS_IPV6)==type) &&
((e->proto==PROTO_NONE) || (proto==PROTO_NONE) ||
(e->proto==proto)) &&
(memcmp(ip->u.addr, e->ip, ip->len)==0)){
*crt=(*crt)->next;
tmp=crt;
*blst_mem_used-=DST_BLST_ENTRY_SIZE(*e);
BLST_HASH_STATS_DEC(hash);
blst_destroy_entry(e);
return 1;
}
}
return 0;
}
/* frees all the expired entries until either there are no more of them
* or the total memory used is <= target (to free all of them use -1 for
* targer)
* params: target - free expired entries until no more then taget memory
* is used (use 0 to free all of them)
* delta - consider an entry expired if it expires after delta
* ticks from now
* timeout - exit after timeout ticks
*
* returns: number of deleted entries
* This function should be called periodically from a timer
*/
inline static int dst_blacklist_clean_expired(unsigned int target,
ticks_t delta,
ticks_t timeout)
{
static unsigned int start=0;
unsigned int h;
struct dst_blst_entry** crt;
struct dst_blst_entry** tmp;
struct dst_blst_entry* e;
ticks_t start_time;
ticks_t now;
int no=0;
int i;
now=start_time=get_ticks_raw();
for(h=start; h!=(start+DST_BLST_HASH_SIZE); h++){
i=h%DST_BLST_HASH_SIZE;
if (dst_blst_hash[i].first){
LOCK_BLST(i);
for (crt=&dst_blst_hash[i].first, tmp=&(*crt)->next;
*crt; crt=tmp, tmp=&(*crt)->next){
e=*crt;
prefetch_loc_r((*crt)->next, 1);
if ((s_ticks_t)(now+delta-(*crt)->expire)>=0){
*crt=(*crt)->next;
tmp=crt;
*blst_mem_used-=DST_BLST_ENTRY_SIZE(*e);
blst_destroy_entry(e);
BLST_HASH_STATS_DEC(i);
no++;
if (*blst_mem_used<=target){
UNLOCK_BLST(i);
goto skip;
}
}
}
UNLOCK_BLST(i);
/* check for timeout only "between" hash cells */
now=get_ticks_raw();
if ((now-start_time)>=timeout){
DBG("_dst_blacklist_clean_expired_unsafe: timeout: %d > %d\n",
TICKS_TO_MS(now-start_time), TICKS_TO_MS(timeout));
goto skip;
}
}
}
skip:
start=h; /* next time we start where we left */
if (no){
DBG("dst_blacklist_clean_expired, %d entries removed\n", no);
}
return no;
}
/* timer */
static ticks_t blst_timer(ticks_t ticks, struct timer_ln* tl, void* data)
{
dst_blacklist_clean_expired(0, 0, 2); /*spend max. 2 ticks*/
return (ticks_t)(-1);
}
/* adds a proto ip:port combination to the blacklist
* returns 0 on success, -1 on error (blacklist full -- would use more then
* blst:_max_mem, or out of shm. mem.)
*/
inline static int dst_blacklist_add_ip(unsigned char err_flags,
unsigned char proto,
struct ip_addr* ip, unsigned short port,
ticks_t timeout)
{
int size;
struct dst_blst_entry* e;
unsigned short hash;
ticks_t now;
int ret;
ret=0;
if (ip->af==AF_INET){
err_flags&=~BLST_IS_IPV6; /* make sure the ipv6 flag is reset */
size=sizeof(struct dst_blst_entry);
}else{
err_flags|=BLST_IS_IPV6;
size=sizeof(struct dst_blst_entry)+12 /* ipv6 addr - 4 */;
}
now=get_ticks_raw();
hash=dst_blst_hash_no(proto, ip, port);
/* check if the entry already exists */
LOCK_BLST(hash);
e=_dst_blacklist_lst_find(hash, ip, proto, port, now);
if (e){
e->flags|=err_flags;
e->expire=now+timeout; /* update the timeout */
}else{
if (unlikely((*blst_mem_used+size) >=
cfg_get(core, core_cfg, blst_max_mem))){
#ifdef USE_DST_BLACKLIST_STATS
dst_blacklist_stats[process_no].bkl_lru_cnt++;
#endif
UNLOCK_BLST(hash);
/* first try to free some memory (~ 12%), but don't
* spend more then 250 ms*/
dst_blacklist_clean_expired(*blst_mem_used/16*14, 0,
MS_TO_TICKS(250));
if (unlikely(*blst_mem_used+size >=
cfg_get(core, core_cfg, blst_max_mem))){
ret=-1;
goto error;
}
LOCK_BLST(hash);
}
e=shm_malloc(size);
if (e==0){
UNLOCK_BLST(hash);
ret=E_OUT_OF_MEM;
goto error;
}
*blst_mem_used+=size;
e->flags=err_flags;
e->proto=proto;
e->port=port;
memcpy(e->ip, ip->u.addr, ip->len);
e->expire=now+timeout; /* update the timeout */
e->next=0;
dst_blacklist_lst_add(&dst_blst_hash[hash].first, e);
BLST_HASH_STATS_INC(hash);
}
UNLOCK_BLST(hash);
error:
return ret;
}
/* if no blacklisted returns 0, else returns the blacklist flags */
inline static int dst_is_blacklisted_ip(unsigned char proto,
struct ip_addr* ip,
unsigned short port)
{
struct dst_blst_entry* e;
unsigned short hash;
ticks_t now;
int ret;
ret=0;
now=get_ticks_raw();
hash=dst_blst_hash_no(proto, ip, port);
if (unlikely(dst_blst_hash[hash].first)){
LOCK_BLST(hash);
e=_dst_blacklist_lst_find(hash, ip, proto, port, now);
if (e){
ret=e->flags;
}
UNLOCK_BLST(hash);
}
return ret;
}
/** add dst to the blacklist, specifying the timeout.
* @param err_flags - reason (bitmap)
* @param si - destination (protocol, ip and port)
* @param msg - sip message that triggered the blacklisting (can be 0 if
* not known)
* @param timeout - timeout in ticks
* @return 0 on success, -1 on error
*/
int dst_blacklist_force_add_to(unsigned char err_flags, struct dest_info* si,
struct sip_msg* msg, ticks_t timeout)
{
struct ip_addr ip;
#ifdef DST_BLACKLIST_HOOKS
if (unlikely (blacklist_run_hooks(&blst_add_cb, si, &err_flags, msg) ==
DST_BLACKLIST_DENY))
return 0;
#endif
su2ip_addr(&ip, &si->to);
return dst_blacklist_add_ip(err_flags, si->proto, &ip,
su_getport(&si->to), timeout);
}
/** add dst to the blacklist, specifying the timeout.
* (like @function dst_blacklist_force_add_to)= above, but uses
* (proto, sockaddr_union) instead of struct dest_info)
*/
int dst_blacklist_force_su_to(unsigned char err_flags, unsigned char proto,
union sockaddr_union* dst,
struct sip_msg* msg, ticks_t timeout)
{
struct ip_addr ip;
#ifdef DST_BLACKLIST_HOOKS
struct dest_info si;
init_dest_info(&si);
si.to=*dst;
si.proto=proto;
if (unlikely (blacklist_run_hooks(&blst_add_cb, &si, &err_flags, msg) ==
DST_BLACKLIST_DENY))
return 0;
#endif
su2ip_addr(&ip, dst);
return dst_blacklist_add_ip(err_flags, proto, &ip,
su_getport(dst), timeout);
}
int dst_is_blacklisted(struct dest_info* si, struct sip_msg* msg)
{
int ires;
struct ip_addr ip;
#ifdef DST_BLACKLIST_HOOKS
unsigned char err_flags;
int action;
#endif
su2ip_addr(&ip, &si->to);
#ifdef DST_BLACKLIST_HOOKS
err_flags=0;
if (unlikely((action=(blacklist_run_hooks(&blst_search_cb, si, &err_flags, msg))
) != DST_BLACKLIST_CONTINUE)){
if (action==DST_BLACKLIST_DENY)
return 0;
else /* if (action==DST_BLACKLIST_ACCEPT) */
return err_flags;
}
#endif
ires=dst_is_blacklisted_ip(si->proto, &ip, su_getport(&si->to));
#ifdef USE_DST_BLACKLIST_STATS
if (ires)
dst_blacklist_stats[process_no].bkl_hit_cnt++;
#endif
return ires;
}
/* returns 1 if the entry was deleted, 0 if not found */
int dst_blacklist_del(struct dest_info* si, struct sip_msg* msg)
{
unsigned short hash;
struct ip_addr ip;
ticks_t now;
int ret;
unsigned short port;
ret=0;
su2ip_addr(&ip, &si->to);
port=su_getport(&si->to);
now=get_ticks_raw();
hash=dst_blst_hash_no(si->proto, &ip, port);
if (unlikely(dst_blst_hash[hash].first)){
LOCK_BLST(hash);
ret=_dst_blacklist_del(hash, &ip, si->proto, port, now);
UNLOCK_BLST(hash);
}
return ret;
}
/* rpc functions */
void dst_blst_mem_info(rpc_t* rpc, void* ctx)
{
if (!cfg_get(core, core_cfg, use_dst_blacklist)){
rpc->fault(ctx, 500, "dst blacklist support disabled");
return;
}
rpc->add(ctx, "dd", *blst_mem_used, cfg_get(core, core_cfg, blst_max_mem));
}
#ifdef USE_DST_BLACKLIST_STATS
static unsigned long stat_sum(int ivar, int breset) {
unsigned long isum=0;
int i1=0;
for (; i1 < get_max_procs(); i1++)
switch (ivar) {
case 0:
isum+=dst_blacklist_stats[i1].bkl_hit_cnt;
if (breset)
dst_blacklist_stats[i1].bkl_hit_cnt=0;
break;
case 1:
isum+=dst_blacklist_stats[i1].bkl_lru_cnt;
if (breset)
dst_blacklist_stats[i1].bkl_lru_cnt=0;
break;
}
return isum;
}
void dst_blst_stats_get(rpc_t* rpc, void* c)
{
char *name=NULL;
void *handle;
int found=0,i=0;
int reset=0;
char* dst_blacklist_stats_names[] = {
"bkl_hit_cnt",
"bkl_lru_cnt",
NULL
};
if (!cfg_get(core, core_cfg, use_dst_blacklist)){
rpc->fault(c, 500, "dst blacklist support disabled");
return;
}
if (rpc->scan(c, "s", &name) < 0)
return;
if (rpc->scan(c, "d", &reset) < 0)
return;
if (!strcasecmp(name, DST_BLACKLIST_ALL_STATS)) {
/* dump all the dns cache stat values */
rpc->add(c, "{", &handle);
for (i=0; dst_blacklist_stats_names[i]; i++)
rpc->struct_add(handle, "d",
dst_blacklist_stats_names[i],
stat_sum(i, reset));
found=1;
} else {
for (i=0; dst_blacklist_stats_names[i]; i++)
if (!strcasecmp(dst_blacklist_stats_names[i], name)) {
rpc->add(c, "{", &handle);
rpc->struct_add(handle, "d",
dst_blacklist_stats_names[i],
stat_sum(i, reset));
found=1;
break;
}
}
if(!found)
rpc->fault(c, 500, "unknown dst blacklist stat parameter");
return;
}
#endif /* USE_DST_BLACKLIST_STATS */
/* only for debugging, it helds the lock too long for "production" use */