aboutsummaryrefslogtreecommitdiffstats
path: root/framework/src/suricata/src/decode.h
blob: f57dcea997fb0df1723ac843cb565ea7d448a21a (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
/* Copyright (C) 2007-2013 Open Information Security Foundation
 *
 * You can copy, redistribute or modify this Program under the terms of
 * the GNU General Public License version 2 as published by the Free
 * Software Foundation.
 *
 * This program 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
 * version 2 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

/**
 * \file
 *
 * \author Victor Julien <victor@inliniac.net>
 */

#ifndef __DECODE_H__
#define __DECODE_H__

//#define DBG_THREADS
#define COUNTERS

#include "suricata-common.h"
#include "threadvars.h"
#include "decode-events.h"

#ifdef __SC_CUDA_SUPPORT__
#include "util-cuda-buffer.h"
#include "util-cuda-vars.h"
#endif /* __SC_CUDA_SUPPORT__ */

typedef enum {
    CHECKSUM_VALIDATION_DISABLE,
    CHECKSUM_VALIDATION_ENABLE,
    CHECKSUM_VALIDATION_AUTO,
    CHECKSUM_VALIDATION_RXONLY,
    CHECKSUM_VALIDATION_KERNEL,
} ChecksumValidationMode;

enum PktSrcEnum {
    PKT_SRC_WIRE = 1,
    PKT_SRC_DECODER_GRE,
    PKT_SRC_DECODER_IPV4,
    PKT_SRC_DECODER_IPV6,
    PKT_SRC_DECODER_TEREDO,
    PKT_SRC_DEFRAG,
    PKT_SRC_STREAM_TCP_STREAM_END_PSEUDO,
    PKT_SRC_FFR,
};

#include "source-nflog.h"
#include "source-nfq.h"
#include "source-ipfw.h"
#include "source-pcap.h"
#include "source-af-packet.h"
#include "source-mpipe.h"
#include "source-netmap.h"

#include "action-globals.h"

#include "decode-erspan.h"
#include "decode-ethernet.h"
#include "decode-gre.h"
#include "decode-ppp.h"
#include "decode-pppoe.h"
#include "decode-sll.h"
#include "decode-ipv4.h"
#include "decode-ipv6.h"
#include "decode-icmpv4.h"
#include "decode-icmpv6.h"
#include "decode-tcp.h"
#include "decode-udp.h"
#include "decode-sctp.h"
#include "decode-raw.h"
#include "decode-null.h"
#include "decode-vlan.h"
#include "decode-mpls.h"

#include "detect-reference.h"

#include "app-layer-protos.h"

/* forward declarations */
struct DetectionEngineThreadCtx_;
typedef struct AppLayerThreadCtx_ AppLayerThreadCtx;

struct PktPool_;

/* declare these here as they are called from the
 * PACKET_RECYCLE and PACKET_CLEANUP macro's. */
typedef struct AppLayerDecoderEvents_ AppLayerDecoderEvents;
void AppLayerDecoderEventsResetEvents(AppLayerDecoderEvents *events);
void AppLayerDecoderEventsFreeEvents(AppLayerDecoderEvents **events);

/* Address */
typedef struct Address_ {
    char family;
    union {
        uint32_t       address_un_data32[4]; /* type-specific field */
        uint16_t       address_un_data16[8]; /* type-specific field */
        uint8_t        address_un_data8[16]; /* type-specific field */
    } address;
} Address;

#define addr_data32 address.address_un_data32
#define addr_data16 address.address_un_data16
#define addr_data8  address.address_un_data8

#define COPY_ADDRESS(a, b) do {                    \
        (b)->family = (a)->family;                 \
        (b)->addr_data32[0] = (a)->addr_data32[0]; \
        (b)->addr_data32[1] = (a)->addr_data32[1]; \
        (b)->addr_data32[2] = (a)->addr_data32[2]; \
        (b)->addr_data32[3] = (a)->addr_data32[3]; \
    } while (0)

/* Set the IPv4 addresses into the Addrs of the Packet.
 * Make sure p->ip4h is initialized and validated.
 *
 * We set the rest of the struct to 0 so we can
 * prevent using memset. */
#define SET_IPV4_SRC_ADDR(p, a) do {                              \
        (a)->family = AF_INET;                                    \
        (a)->addr_data32[0] = (uint32_t)(p)->ip4h->s_ip_src.s_addr; \
        (a)->addr_data32[1] = 0;                                  \
        (a)->addr_data32[2] = 0;                                  \
        (a)->addr_data32[3] = 0;                                  \
    } while (0)

#define SET_IPV4_DST_ADDR(p, a) do {                              \
        (a)->family = AF_INET;                                    \
        (a)->addr_data32[0] = (uint32_t)(p)->ip4h->s_ip_dst.s_addr; \
        (a)->addr_data32[1] = 0;                                  \
        (a)->addr_data32[2] = 0;                                  \
        (a)->addr_data32[3] = 0;                                  \
    } while (0)

/* clear the address structure by setting all fields to 0 */
#define CLEAR_ADDR(a) do {       \
        (a)->family = 0;         \
        (a)->addr_data32[0] = 0; \
        (a)->addr_data32[1] = 0; \
        (a)->addr_data32[2] = 0; \
        (a)->addr_data32[3] = 0; \
    } while (0)

/* Set the IPv6 addressesinto the Addrs of the Packet.
 * Make sure p->ip6h is initialized and validated. */
#define SET_IPV6_SRC_ADDR(p, a) do {                    \
        (a)->family = AF_INET6;                         \
        (a)->addr_data32[0] = (p)->ip6h->s_ip6_src[0];  \
        (a)->addr_data32[1] = (p)->ip6h->s_ip6_src[1];  \
        (a)->addr_data32[2] = (p)->ip6h->s_ip6_src[2];  \
        (a)->addr_data32[3] = (p)->ip6h->s_ip6_src[3];  \
    } while (0)

#define SET_IPV6_DST_ADDR(p, a) do {                    \
        (a)->family = AF_INET6;                         \
        (a)->addr_data32[0] = (p)->ip6h->s_ip6_dst[0];  \
        (a)->addr_data32[1] = (p)->ip6h->s_ip6_dst[1];  \
        (a)->addr_data32[2] = (p)->ip6h->s_ip6_dst[2];  \
        (a)->addr_data32[3] = (p)->ip6h->s_ip6_dst[3];  \
    } while (0)

/* Set the TCP ports into the Ports of the Packet.
 * Make sure p->tcph is initialized and validated. */
#define SET_TCP_SRC_PORT(pkt, prt) do {            \
        SET_PORT(TCP_GET_SRC_PORT((pkt)), *(prt)); \
    } while (0)

#define SET_TCP_DST_PORT(pkt, prt) do {            \
        SET_PORT(TCP_GET_DST_PORT((pkt)), *(prt)); \
    } while (0)

/* Set the UDP ports into the Ports of the Packet.
 * Make sure p->udph is initialized and validated. */
#define SET_UDP_SRC_PORT(pkt, prt) do {            \
        SET_PORT(UDP_GET_SRC_PORT((pkt)), *(prt)); \
    } while (0)
#define SET_UDP_DST_PORT(pkt, prt) do {            \
        SET_PORT(UDP_GET_DST_PORT((pkt)), *(prt)); \
    } while (0)

/* Set the SCTP ports into the Ports of the Packet.
 * Make sure p->sctph is initialized and validated. */
#define SET_SCTP_SRC_PORT(pkt, prt) do {            \
        SET_PORT(SCTP_GET_SRC_PORT((pkt)), *(prt)); \
    } while (0)

#define SET_SCTP_DST_PORT(pkt, prt) do {            \
        SET_PORT(SCTP_GET_DST_PORT((pkt)), *(prt)); \
    } while (0)



#define GET_IPV4_SRC_ADDR_U32(p) ((p)->src.addr_data32[0])
#define GET_IPV4_DST_ADDR_U32(p) ((p)->dst.addr_data32[0])
#define GET_IPV4_SRC_ADDR_PTR(p) ((p)->src.addr_data32)
#define GET_IPV4_DST_ADDR_PTR(p) ((p)->dst.addr_data32)

#define GET_IPV6_SRC_ADDR(p) ((p)->src.addr_data32)
#define GET_IPV6_DST_ADDR(p) ((p)->dst.addr_data32)
#define GET_TCP_SRC_PORT(p)  ((p)->sp)
#define GET_TCP_DST_PORT(p)  ((p)->dp)

#define GET_PKT_LEN(p) ((p)->pktlen)
#define GET_PKT_DATA(p) ((((p)->ext_pkt) == NULL ) ? (uint8_t *)((p) + 1) : (p)->ext_pkt)
#define GET_PKT_DIRECT_DATA(p) (uint8_t *)((p) + 1)
#define GET_PKT_DIRECT_MAX_SIZE(p) (default_packet_size)

#define SET_PKT_LEN(p, len) do { \
    (p)->pktlen = (len); \
    } while (0)


/* Port is just a uint16_t */
typedef uint16_t Port;
#define SET_PORT(v, p) ((p) = (v))
#define COPY_PORT(a,b) ((b) = (a))

#define CMP_ADDR(a1, a2) \
    (((a1)->addr_data32[3] == (a2)->addr_data32[3] && \
      (a1)->addr_data32[2] == (a2)->addr_data32[2] && \
      (a1)->addr_data32[1] == (a2)->addr_data32[1] && \
      (a1)->addr_data32[0] == (a2)->addr_data32[0]))
#define CMP_PORT(p1, p2) \
    ((p1) == (p2))

/*Given a packet pkt offset to the start of the ip header in a packet
 *We determine the ip version. */
#define IP_GET_RAW_VER(pkt) ((((pkt)[0] & 0xf0) >> 4))

#define PKT_IS_IPV4(p)      (((p)->ip4h != NULL))
#define PKT_IS_IPV6(p)      (((p)->ip6h != NULL))
#define PKT_IS_TCP(p)       (((p)->tcph != NULL))
#define PKT_IS_UDP(p)       (((p)->udph != NULL))
#define PKT_IS_ICMPV4(p)    (((p)->icmpv4h != NULL))
#define PKT_IS_ICMPV6(p)    (((p)->icmpv6h != NULL))
#define PKT_IS_TOSERVER(p)  (((p)->flowflags & FLOW_PKT_TOSERVER))
#define PKT_IS_TOCLIENT(p)  (((p)->flowflags & FLOW_PKT_TOCLIENT))

#define IPH_IS_VALID(p) (PKT_IS_IPV4((p)) || PKT_IS_IPV6((p)))

/* Retrieve proto regardless of IP version */
#define IP_GET_IPPROTO(p) \
    (p->proto ? p->proto : \
    (PKT_IS_IPV4((p))? IPV4_GET_IPPROTO((p)) : (PKT_IS_IPV6((p))? IPV6_GET_L4PROTO((p)) : 0)))

/* structure to store the sids/gids/etc the detection engine
 * found in this packet */
typedef struct PacketAlert_ {
    SigIntId num; /* Internal num, used for sorting */
    uint8_t action; /* Internal num, used for sorting */
    uint8_t flags;
    struct Signature_ *s;
    uint64_t tx_id;
} PacketAlert;

/** After processing an alert by the thresholding module, if at
 *  last it gets triggered, we might want to stick the drop action to
 *  the flow on IPS mode */
#define PACKET_ALERT_FLAG_DROP_FLOW     0x01
/** alert was generated based on state */
#define PACKET_ALERT_FLAG_STATE_MATCH   0x02
/** alert was generated based on stream */
#define PACKET_ALERT_FLAG_STREAM_MATCH  0x04
/** alert is in a tx, tx_id set */
#define PACKET_ALERT_FLAG_TX            0x08

#define PACKET_ALERT_MAX 15

typedef struct PacketAlerts_ {
    uint16_t cnt;
    PacketAlert alerts[PACKET_ALERT_MAX];
    /* single pa used when we're dropping,
     * so we can log it out in the drop log. */
    PacketAlert drop;
} PacketAlerts;

/** number of decoder events we support per packet. Power of 2 minus 1
 *  for memory layout */
#define PACKET_ENGINE_EVENT_MAX 15

/** data structure to store decoder, defrag and stream events */
typedef struct PacketEngineEvents_ {
    uint8_t cnt;                                /**< number of events */
    uint8_t events[PACKET_ENGINE_EVENT_MAX];   /**< array of events */
} PacketEngineEvents;

typedef struct PktVar_ {
    char *name;
    struct PktVar_ *next; /* right now just implement this as a list,
                           * in the long run we have thing of something
                           * faster. */
    uint8_t *value;
    uint16_t value_len;
} PktVar;

#ifdef PROFILING

/** \brief Per TMM stats storage */
typedef struct PktProfilingTmmData_ {
    uint64_t ticks_start;
    uint64_t ticks_end;
#ifdef PROFILE_LOCKING
    uint64_t mutex_lock_cnt;
    uint64_t mutex_lock_wait_ticks;
    uint64_t mutex_lock_contention;
    uint64_t spin_lock_cnt;
    uint64_t spin_lock_wait_ticks;
    uint64_t spin_lock_contention;
    uint64_t rww_lock_cnt;
    uint64_t rww_lock_wait_ticks;
    uint64_t rww_lock_contention;
    uint64_t rwr_lock_cnt;
    uint64_t rwr_lock_wait_ticks;
    uint64_t rwr_lock_contention;
#endif
} PktProfilingTmmData;

typedef struct PktProfilingDetectData_ {
    uint64_t ticks_start;
    uint64_t ticks_end;
    uint64_t ticks_spent;
} PktProfilingDetectData;

typedef struct PktProfilingAppData_ {
    uint64_t ticks_spent;
} PktProfilingAppData;

/** \brief Per pkt stats storage */
typedef struct PktProfiling_ {
    uint64_t ticks_start;
    uint64_t ticks_end;

    PktProfilingTmmData tmm[TMM_SIZE];
    PktProfilingAppData app[ALPROTO_MAX];
    PktProfilingDetectData detect[PROF_DETECT_SIZE];
    uint64_t proto_detect;
} PktProfiling;

#endif /* PROFILING */

/* forward declartion since Packet struct definition requires this */
struct PacketQueue_;

/* sizes of the members:
 * src: 17 bytes
 * dst: 17 bytes
 * sp/type: 1 byte
 * dp/code: 1 byte
 * proto: 1 byte
 * recurs: 1 byte
 *
 * sum of above: 38 bytes
 *
 * flow ptr: 4/8 bytes
 * flags: 1 byte
 * flowflags: 1 byte
 *
 * sum of above 44/48 bytes
 */
typedef struct Packet_
{
    /* Addresses, Ports and protocol
     * these are on top so we can use
     * the Packet as a hash key */
    Address src;
    Address dst;
    union {
        Port sp;
        uint8_t type;
    };
    union {
        Port dp;
        uint8_t code;
    };
    uint8_t proto;
    /* make sure we can't be attacked on when the tunneled packet
     * has the exact same tuple as the lower levels */
    uint8_t recursion_level;

    uint16_t vlan_id[2];
    uint8_t vlan_idx;

    /* flow */
    uint8_t flowflags;
    /* coccinelle: Packet:flowflags:FLOW_PKT_ */

    /* Pkt Flags */
    uint32_t flags;

    struct Flow_ *flow;

    struct timeval ts;

    union {
        /* nfq stuff */
#ifdef HAVE_NFLOG
        NFLOGPacketVars nflog_v;
#endif /* HAVE_NFLOG */
#ifdef NFQ
        NFQPacketVars nfq_v;
#endif /* NFQ */
#ifdef IPFW
        IPFWPacketVars ipfw_v;
#endif /* IPFW */
#ifdef AF_PACKET
        AFPPacketVars afp_v;
#endif
#ifdef HAVE_MPIPE
        /* tilegx mpipe stuff */
        MpipePacketVars mpipe_v;
#endif
#ifdef HAVE_NETMAP
        NetmapPacketVars netmap_v;
#endif

        /** libpcap vars: shared by Pcap Live mode and Pcap File mode */
        PcapPacketVars pcap_v;
    };

    /** The release function for packet structure and data */
    void (*ReleasePacket)(struct Packet_ *);

    /* pkt vars */
    PktVar *pktvar;

    /* header pointers */
    EthernetHdr *ethh;

    /* Checksum for IP packets. */
    int32_t level3_comp_csum;
    /* Check sum for TCP, UDP or ICMP packets */
    int32_t level4_comp_csum;

    IPV4Hdr *ip4h;

    IPV6Hdr *ip6h;

    /* IPv4 and IPv6 are mutually exclusive */
    union {
        IPV4Vars ip4vars;
        struct {
            IPV6Vars ip6vars;
            IPV6ExtHdrs ip6eh;
        };
    };
    /* Can only be one of TCP, UDP, ICMP at any given time */
    union {
        TCPVars tcpvars;
        UDPVars udpvars;
        ICMPV4Vars icmpv4vars;
        ICMPV6Vars icmpv6vars;
    };

    TCPHdr *tcph;

    UDPHdr *udph;

    SCTPHdr *sctph;

    ICMPV4Hdr *icmpv4h;

    ICMPV6Hdr *icmpv6h;

    PPPHdr *ppph;
    PPPOESessionHdr *pppoesh;
    PPPOEDiscoveryHdr *pppoedh;

    GREHdr *greh;

    VLANHdr *vlanh[2];

    /* ptr to the payload of the packet
     * with it's length. */
    uint8_t *payload;
    uint16_t payload_len;

    /* IPS action to take */
    uint8_t action;

    uint8_t pkt_src;

    /* storage: set to pointer to heap and extended via allocation if necessary */
    uint32_t pktlen;
    uint8_t *ext_pkt;

    /* Incoming interface */
    struct LiveDevice_ *livedev;

    PacketAlerts alerts;

    struct Host_ *host_src;
    struct Host_ *host_dst;

    /** packet number in the pcap file, matches wireshark */
    uint64_t pcap_cnt;


    /* engine events */
    PacketEngineEvents events;

    AppLayerDecoderEvents *app_layer_events;

    /* double linked list ptrs */
    struct Packet_ *next;
    struct Packet_ *prev;

    /** data linktype in host order */
    int datalink;

    /* used to hold flowbits only if debuglog is enabled */
    int debuglog_flowbits_names_len;
    const char **debuglog_flowbits_names;

    /* tunnel/encapsulation handling */
    struct Packet_ *root; /* in case of tunnel this is a ptr
                           * to the 'real' packet, the one we
                           * need to set the verdict on --
                           * It should always point to the lowest
                           * packet in a encapsulated packet */

    /** mutex to protect access to:
     *  - tunnel_rtv_cnt
     *  - tunnel_tpr_cnt
     */
    SCMutex tunnel_mutex;
    /* ready to set verdict counter, only set in root */
    uint16_t tunnel_rtv_cnt;
    /* tunnel packet ref count */
    uint16_t tunnel_tpr_cnt;

    /** tenant id for this packet, if any. If 0 then no tenant was assigned. */
    uint32_t tenant_id;

    /* The Packet pool from which this packet was allocated. Used when returning
     * the packet to its owner's stack. If NULL, then allocated with malloc.
     */
    struct PktPool_ *pool;

#ifdef PROFILING
    PktProfiling *profile;
#endif
#ifdef __SC_CUDA_SUPPORT__
    CudaPacketVars cuda_pkt_vars;
#endif
}
#ifdef HAVE_MPIPE
    /* mPIPE requires packet buffers to be aligned to 128 byte boundaries. */
    __attribute__((aligned(128)))
#endif
Packet;

#define DEFAULT_PACKET_SIZE (1500 + ETHERNET_HEADER_LEN)
/* storage: maximum ip packet size + link header */
#define MAX_PAYLOAD_SIZE (IPV6_HEADER_LEN + 65536 + 28)
uint32_t default_packet_size;
#define SIZE_OF_PACKET (default_packet_size + sizeof(Packet))

typedef struct PacketQueue_ {
    Packet *top;
    Packet *bot;
    uint32_t len;
#ifdef DBG_PERF
    uint32_t dbg_maxlen;
#endif /* DBG_PERF */
    SCMutex mutex_q;
    SCCondT cond_q;
} PacketQueue;

/** \brief Structure to hold thread specific data for all decode modules */
typedef struct DecodeThreadVars_
{
    /** Specific context for udp protocol detection (here atm) */
    AppLayerThreadCtx *app_tctx;

    int vlan_disabled;

    /** stats/counters */
    uint16_t counter_pkts;
    uint16_t counter_bytes;
    uint16_t counter_avg_pkt_size;
    uint16_t counter_max_pkt_size;

    uint16_t counter_invalid;

    uint16_t counter_eth;
    uint16_t counter_ipv4;
    uint16_t counter_ipv6;
    uint16_t counter_tcp;
    uint16_t counter_udp;
    uint16_t counter_icmpv4;
    uint16_t counter_icmpv6;

    uint16_t counter_sll;
    uint16_t counter_raw;
    uint16_t counter_null;
    uint16_t counter_sctp;
    uint16_t counter_ppp;
    uint16_t counter_gre;
    uint16_t counter_vlan;
    uint16_t counter_vlan_qinq;
    uint16_t counter_pppoe;
    uint16_t counter_teredo;
    uint16_t counter_mpls;
    uint16_t counter_ipv4inipv6;
    uint16_t counter_ipv6inipv6;
    uint16_t counter_erspan;

    /** frag stats - defrag runs in the context of the decoder. */
    uint16_t counter_defrag_ipv4_fragments;
    uint16_t counter_defrag_ipv4_reassembled;
    uint16_t counter_defrag_ipv4_timeouts;
    uint16_t counter_defrag_ipv6_fragments;
    uint16_t counter_defrag_ipv6_reassembled;
    uint16_t counter_defrag_ipv6_timeouts;
    uint16_t counter_defrag_max_hit;

    uint16_t counter_flow_memcap;

    /* thread data for flow logging api: only used at forced
     * flow recycle during lookups */
    void *output_flow_thread_data;

#ifdef __SC_CUDA_SUPPORT__
    CudaThreadVars cuda_vars;
#endif
} DecodeThreadVars;

typedef struct CaptureStats_ {

    uint16_t counter_ips_accepted;
    uint16_t counter_ips_blocked;
    uint16_t counter_ips_rejected;
    uint16_t counter_ips_replaced;

} CaptureStats;

void CaptureStatsUpdate(ThreadVars *tv, CaptureStats *s, const Packet *p);
void CaptureStatsSetup(ThreadVars *tv, CaptureStats *s);

/**
 *  \brief reset these to -1(indicates that the packet is fresh from the queue)
 */
#define PACKET_RESET_CHECKSUMS(p) do { \
        (p)->level3_comp_csum = -1;   \
        (p)->level4_comp_csum = -1;   \
    } while (0)

/* if p uses extended data, free them */
#define PACKET_FREE_EXTDATA(p) do {                 \
        if ((p)->ext_pkt) {                         \
            if (!((p)->flags & PKT_ZERO_COPY)) {    \
                SCFree((p)->ext_pkt);               \
            }                                       \
            (p)->ext_pkt = NULL;                    \
        }                                           \
    } while(0)

/**
 *  \brief Initialize a packet structure for use.
 */
#ifdef __SC_CUDA_SUPPORT__
#include "util-cuda-handlers.h"
#include "util-mpm.h"

#define PACKET_INITIALIZE(p) do {                                       \
        memset((p), 0x00, SIZE_OF_PACKET);                              \
        SCMutexInit(&(p)->tunnel_mutex, NULL);                          \
        PACKET_RESET_CHECKSUMS((p));                                    \
        (p)->livedev = NULL;                                            \
        SCMutexInit(&(p)->cuda_pkt_vars.cuda_mutex, NULL);            \
        SCCondInit(&(p)->cuda_pkt_vars.cuda_cond, NULL);                \
    } while (0)
#else
#define PACKET_INITIALIZE(p) {         \
    SCMutexInit(&(p)->tunnel_mutex, NULL); \
    PACKET_RESET_CHECKSUMS((p)); \
    (p)->livedev = NULL; \
}
#endif

#define PACKET_RELEASE_REFS(p) do {              \
        FlowDeReference(&((p)->flow));          \
        HostDeReference(&((p)->host_src));      \
        HostDeReference(&((p)->host_dst));      \
    } while (0)

/**
 *  \brief Recycle a packet structure for reuse.
 */
#define PACKET_REINIT(p) do {             \
        CLEAR_ADDR(&(p)->src);                  \
        CLEAR_ADDR(&(p)->dst);                  \
        (p)->sp = 0;                            \
        (p)->dp = 0;                            \
        (p)->proto = 0;                         \
        (p)->recursion_level = 0;               \
        PACKET_FREE_EXTDATA((p));               \
        (p)->flags = (p)->flags & PKT_ALLOC;    \
        (p)->flowflags = 0;                     \
        (p)->pkt_src = 0;                       \
        (p)->vlan_id[0] = 0;                    \
        (p)->vlan_id[1] = 0;                    \
        (p)->vlan_idx = 0;                      \
        (p)->ts.tv_sec = 0;                     \
        (p)->ts.tv_usec = 0;                    \
        (p)->datalink = 0;                      \
        (p)->action = 0;                        \
        if ((p)->pktvar != NULL) {              \
            PktVarFree((p)->pktvar);            \
            (p)->pktvar = NULL;                 \
        }                                       \
        (p)->ethh = NULL;                       \
        if ((p)->ip4h != NULL) {                \
            CLEAR_IPV4_PACKET((p));             \
        }                                       \
        if ((p)->ip6h != NULL) {                \
            CLEAR_IPV6_PACKET((p));             \
        }                                       \
        if ((p)->tcph != NULL) {                \
            CLEAR_TCP_PACKET((p));              \
        }                                       \
        if ((p)->udph != NULL) {                \
            CLEAR_UDP_PACKET((p));              \
        }                                       \
        if ((p)->sctph != NULL) {               \
            CLEAR_SCTP_PACKET((p));             \
        }                                       \
        if ((p)->icmpv4h != NULL) {             \
            CLEAR_ICMPV4_PACKET((p));           \
        }                                       \
        if ((p)->icmpv6h != NULL) {             \
            CLEAR_ICMPV6_PACKET((p));           \
        }                                       \
        (p)->ppph = NULL;                       \
        (p)->pppoesh = NULL;                    \
        (p)->pppoedh = NULL;                    \
        (p)->greh = NULL;                       \
        (p)->vlanh[0] = NULL;                   \
        (p)->vlanh[1] = NULL;                   \
        (p)->payload = NULL;                    \
        (p)->payload_len = 0;                   \
        (p)->pktlen = 0;                        \
        (p)->alerts.cnt = 0;                    \
        (p)->alerts.drop.action = 0;            \
        (p)->pcap_cnt = 0;                      \
        (p)->tunnel_rtv_cnt = 0;                \
        (p)->tunnel_tpr_cnt = 0;                \
        (p)->events.cnt = 0;                    \
        AppLayerDecoderEventsResetEvents((p)->app_layer_events); \
        (p)->next = NULL;                       \
        (p)->prev = NULL;                       \
        (p)->root = NULL;                       \
        (p)->livedev = NULL;                    \
        PACKET_RESET_CHECKSUMS((p));            \
        PACKET_PROFILING_RESET((p));            \
        p->tenant_id = 0;                       \
    } while (0)

#define PACKET_RECYCLE(p) do { \
        PACKET_RELEASE_REFS((p)); \
        PACKET_REINIT((p)); \
    } while (0)

/**
 *  \brief Cleanup a packet so that we can free it. No memset needed..
 */
#define PACKET_DESTRUCTOR(p) do {                  \
        if ((p)->pktvar != NULL) {              \
            PktVarFree((p)->pktvar);            \
        }                                       \
        PACKET_FREE_EXTDATA((p));               \
        SCMutexDestroy(&(p)->tunnel_mutex);     \
        AppLayerDecoderEventsFreeEvents(&(p)->app_layer_events); \
        PACKET_PROFILING_RESET((p));            \
    } while (0)


/* macro's for setting the action
 * handle the case of a root packet
 * for tunnels */

#define PACKET_SET_ACTION(p, a) do { \
    ((p)->root ? \
     ((p)->root->action = a) : \
     ((p)->action = a)); \
} while (0)

#define PACKET_ALERT(p) PACKET_SET_ACTION(p, ACTION_ALERT)

#define PACKET_ACCEPT(p) PACKET_SET_ACTION(p, ACTION_ACCEPT)

#define PACKET_DROP(p) PACKET_SET_ACTION(p, ACTION_DROP)

#define PACKET_REJECT(p) PACKET_SET_ACTION(p, (ACTION_REJECT|ACTION_DROP))

#define PACKET_REJECT_DST(p) PACKET_SET_ACTION(p, (ACTION_REJECT_DST|ACTION_DROP))

#define PACKET_REJECT_BOTH(p) PACKET_SET_ACTION(p, (ACTION_REJECT_BOTH|ACTION_DROP))

#define PACKET_PASS(p) PACKET_SET_ACTION(p, ACTION_PASS)

#define PACKET_TEST_ACTION(p, a) \
    ((p)->root ? \
     ((p)->root->action & a) : \
     ((p)->action & a))

#define PACKET_UPDATE_ACTION(p, a) do { \
    ((p)->root ? \
     ((p)->root->action |= a) : \
     ((p)->action |= a)); \
} while (0)

#define TUNNEL_INCR_PKT_RTV(p) do {                                                 \
        SCMutexLock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);     \
        ((p)->root ? (p)->root->tunnel_rtv_cnt++ : (p)->tunnel_rtv_cnt++);          \
        SCMutexUnlock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);   \
    } while (0)

#define TUNNEL_INCR_PKT_TPR(p) do {                                                 \
        SCMutexLock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);     \
        ((p)->root ? (p)->root->tunnel_tpr_cnt++ : (p)->tunnel_tpr_cnt++);          \
        SCMutexUnlock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);   \
    } while (0)

#define TUNNEL_DECR_PKT_TPR(p) do {                                                 \
        SCMutexLock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);     \
        ((p)->root ? (p)->root->tunnel_tpr_cnt-- : (p)->tunnel_tpr_cnt--);          \
        SCMutexUnlock((p)->root ? &(p)->root->tunnel_mutex : &(p)->tunnel_mutex);   \
    } while (0)

#define TUNNEL_DECR_PKT_TPR_NOLOCK(p) do {                                          \
        ((p)->root ? (p)->root->tunnel_tpr_cnt-- : (p)->tunnel_tpr_cnt--);          \
    } while (0)

#define TUNNEL_PKT_RTV(p) ((p)->root ? (p)->root->tunnel_rtv_cnt : (p)->tunnel_rtv_cnt)
#define TUNNEL_PKT_TPR(p) ((p)->root ? (p)->root->tunnel_tpr_cnt : (p)->tunnel_tpr_cnt)

#define IS_TUNNEL_PKT(p)            (((p)->flags & PKT_TUNNEL))
#define SET_TUNNEL_PKT(p)           ((p)->flags |= PKT_TUNNEL)
#define UNSET_TUNNEL_PKT(p)         ((p)->flags &= ~PKT_TUNNEL)
#define IS_TUNNEL_ROOT_PKT(p)       (IS_TUNNEL_PKT(p) && (p)->root == NULL)

#define IS_TUNNEL_PKT_VERDICTED(p)  (((p)->flags & PKT_TUNNEL_VERDICTED))
#define SET_TUNNEL_PKT_VERDICTED(p) ((p)->flags |= PKT_TUNNEL_VERDICTED)

enum DecodeTunnelProto {
    DECODE_TUNNEL_ETHERNET,
    DECODE_TUNNEL_ERSPAN,
    DECODE_TUNNEL_VLAN,
    DECODE_TUNNEL_IPV4,
    DECODE_TUNNEL_IPV6,
    DECODE_TUNNEL_PPP,
};

Packet *PacketTunnelPktSetup(ThreadVars *tv, DecodeThreadVars *dtv, Packet *parent,
                             uint8_t *pkt, uint16_t len, enum DecodeTunnelProto proto, PacketQueue *pq);
Packet *PacketDefragPktSetup(Packet *parent, uint8_t *pkt, uint16_t len, uint8_t proto);
void PacketDefragPktSetupParent(Packet *parent);
void DecodeRegisterPerfCounters(DecodeThreadVars *, ThreadVars *);
Packet *PacketGetFromQueueOrAlloc(void);
Packet *PacketGetFromAlloc(void);
void PacketDecodeFinalize(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p);
void PacketFree(Packet *p);
void PacketFreeOrRelease(Packet *p);
int PacketCallocExtPkt(Packet *p, int datalen);
int PacketCopyData(Packet *p, uint8_t *pktdata, int pktlen);
int PacketSetData(Packet *p, uint8_t *pktdata, int pktlen);
int PacketCopyDataOffset(Packet *p, int offset, uint8_t *data, int datalen);
const char *PktSrcToString(enum PktSrcEnum pkt_src);

DecodeThreadVars *DecodeThreadVarsAlloc(ThreadVars *);
void DecodeThreadVarsFree(ThreadVars *, DecodeThreadVars *);
void DecodeUpdatePacketCounters(ThreadVars *tv,
                                const DecodeThreadVars *dtv, const Packet *p);

/* decoder functions */
int DecodeEthernet(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeSll(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodePPP(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodePPPOESession(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodePPPOEDiscovery(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeTunnel(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *, enum DecodeTunnelProto) __attribute__ ((warn_unused_result));
int DecodeNull(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeRaw(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeIPV4(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeIPV6(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeICMPV4(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeICMPV6(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeTCP(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeUDP(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeSCTP(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeGRE(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeVLAN(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeMPLS(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);
int DecodeERSPAN(ThreadVars *, DecodeThreadVars *, Packet *, uint8_t *, uint16_t, PacketQueue *);

void AddressDebugPrint(Address *);

/** \brief Set the No payload inspection Flag for the packet.
 *
 * \param p Packet to set the flag in
 */
#define DecodeSetNoPayloadInspectionFlag(p) do { \
        (p)->flags |= PKT_NOPAYLOAD_INSPECTION;  \
    } while (0)

#define DecodeUnsetNoPayloadInspectionFlag(p) do { \
        (p)->flags &= ~PKT_NOPAYLOAD_INSPECTION;  \
    } while (0)

/** \brief Set the No packet inspection Flag for the packet.
 *
 * \param p Packet to set the flag in
 */
#define DecodeSetNoPacketInspectionFlag(p) do { \
        (p)->flags |= PKT_NOPACKET_INSPECTION;  \
    } while (0)
#define DecodeUnsetNoPacketInspectionFlag(p) do { \
        (p)->flags &= ~PKT_NOPACKET_INSPECTION;  \
    } while (0)


#define ENGINE_SET_EVENT(p, e) do { \
    SCLogDebug("p %p event %d", (p), e); \
    if ((p)->events.cnt < PACKET_ENGINE_EVENT_MAX) { \
        (p)->events.events[(p)->events.cnt] = e; \
        (p)->events.cnt++; \
    } \
} while(0)

#define ENGINE_SET_INVALID_EVENT(p, e) do { \
    p->flags |= PKT_IS_INVALID; \
    ENGINE_SET_EVENT(p, e); \
} while(0)



#define ENGINE_ISSET_EVENT(p, e) ({ \
    int r = 0; \
    uint8_t u; \
    for (u = 0; u < (p)->events.cnt; u++) { \
        if ((p)->events.events[u] == (e)) { \
            r = 1; \
            break; \
        } \
    } \
    r; \
})

/* older libcs don't contain a def for IPPROTO_DCCP
 * inside of <netinet/in.h>
 * if it isn't defined let's define it here.
 */
#ifndef IPPROTO_DCCP
#define IPPROTO_DCCP 33
#endif

/* older libcs don't contain a def for IPPROTO_SCTP
 * inside of <netinet/in.h>
 * if it isn't defined let's define it here.
 */
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif

#ifndef IPPROTO_MH
#define IPPROTO_MH 135
#endif

/* Host Identity Protocol (rfc 5201) */
#ifndef IPPROTO_HIP
#define IPPROTO_HIP 139
#endif

#ifndef IPPROTO_SHIM6
#define IPPROTO_SHIM6 140
#endif

/* pcap provides this, but we don't want to depend on libpcap */
#ifndef DLT_EN10MB
#define DLT_EN10MB 1
#endif

/* taken from pcap's bpf.h */
#ifndef DLT_RAW
#ifdef __OpenBSD__
#define DLT_RAW     14  /* raw IP */
#else
#define DLT_RAW     12  /* raw IP */
#endif
#endif

#ifndef DLT_NULL
#define DLT_NULL 0
#endif

/** libpcap shows us the way to linktype codes
 * \todo we need more & maybe put them in a separate file? */
#define LINKTYPE_NULL       DLT_NULL
#define LINKTYPE_ETHERNET   DLT_EN10MB
#define LINKTYPE_LINUX_SLL  113
#define LINKTYPE_PPP        9
#define LINKTYPE_RAW        DLT_RAW
#define PPP_OVER_GRE        11
#define VLAN_OVER_GRE       13

/*Packet Flags*/
#define PKT_NOPACKET_INSPECTION         (1)         /**< Flag to indicate that packet header or contents should not be inspected*/
#define PKT_NOPAYLOAD_INSPECTION        (1<<2)      /**< Flag to indicate that packet contents should not be inspected*/
#define PKT_ALLOC                       (1<<3)      /**< Packet was alloc'd this run, needs to be freed */
#define PKT_HAS_TAG                     (1<<4)      /**< Packet has matched a tag */
#define PKT_STREAM_ADD                  (1<<5)      /**< Packet payload was added to reassembled stream */
#define PKT_STREAM_EST                  (1<<6)      /**< Packet is part of establised stream */
#define PKT_STREAM_EOF                  (1<<7)      /**< Stream is in eof state */
#define PKT_HAS_FLOW                    (1<<8)
#define PKT_PSEUDO_STREAM_END           (1<<9)      /**< Pseudo packet to end the stream */
#define PKT_STREAM_MODIFIED             (1<<10)     /**< Packet is modified by the stream engine, we need to recalc the csum and reinject/replace */
#define PKT_MARK_MODIFIED               (1<<11)     /**< Packet mark is modified */
#define PKT_STREAM_NOPCAPLOG            (1<<12)     /**< Exclude packet from pcap logging as it's part of a stream that has reassembly depth reached. */

#define PKT_TUNNEL                      (1<<13)
#define PKT_TUNNEL_VERDICTED            (1<<14)

#define PKT_IGNORE_CHECKSUM             (1<<15)     /**< Packet checksum is not computed (TX packet for example) */
#define PKT_ZERO_COPY                   (1<<16)     /**< Packet comes from zero copy (ext_pkt must not be freed) */

#define PKT_HOST_SRC_LOOKED_UP          (1<<17)
#define PKT_HOST_DST_LOOKED_UP          (1<<18)

#define PKT_IS_FRAGMENT                 (1<<19)     /**< Packet is a fragment */
#define PKT_IS_INVALID                  (1<<20)
#define PKT_PROFILE                     (1<<21)

/** \brief return 1 if the packet is a pseudo packet */
#define PKT_IS_PSEUDOPKT(p) ((p)->flags & PKT_PSEUDO_STREAM_END)

#define PKT_SET_SRC(p, src_val) ((p)->pkt_src = src_val)

#endif /* __DECODE_H__ */