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107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/* Copyright (C) 2007-2016 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef SURICATA_DETECT_ENGINE_PREFILTER_COMMON_H
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#define SURICATA_DETECT_ENGINE_PREFILTER_COMMON_H
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#include "rust.h"
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typedef union {
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uint8_t u8[16];
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uint16_t u16[8];
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uint32_t u32[4];
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uint64_t u64[2];
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} PrefilterPacketHeaderValue;
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#define PREFILTER_EXTRA_MATCH_UNUSED 0
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#define PREFILTER_EXTRA_MATCH_ALPROTO 1
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#define PREFILTER_EXTRA_MATCH_SRCPORT 2
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#define PREFILTER_EXTRA_MATCH_DSTPORT 3
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typedef struct PrefilterPacketHeaderCtx_ {
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PrefilterPacketHeaderValue v1;
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uint16_t type;
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uint16_t value;
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/** rules to add when the flags are present */
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uint32_t sigs_cnt;
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SigIntId *sigs_array;
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} PrefilterPacketHeaderCtx;
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typedef struct SigsArray_ {
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SigIntId *sigs;
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uint32_t cnt;
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uint32_t offset; // used to track assign pos
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} SigsArray;
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typedef struct PrefilterPacketU8HashCtx_ {
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SigsArray *array[256];
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} PrefilterPacketU8HashCtx;
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#define PREFILTER_U8HASH_MODE_EQ DetectUintModeEqual
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#define PREFILTER_U8HASH_MODE_LT DetectUintModeLt
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#define PREFILTER_U8HASH_MODE_GT DetectUintModeGt
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#define PREFILTER_U8HASH_MODE_RA DetectUintModeRange
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int PrefilterSetupPacketHeader(DetectEngineCtx *de_ctx, SigGroupHead *sgh, int sm_type,
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SignatureMask mask, void (*Set)(PrefilterPacketHeaderValue *v, void *),
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bool (*Compare)(PrefilterPacketHeaderValue v, void *),
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void (*Match)(DetectEngineThreadCtx *det_ctx, Packet *p, const void *pectx));
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int PrefilterSetupPacketHeaderU8Hash(DetectEngineCtx *de_ctx, SigGroupHead *sgh, int sm_type,
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SignatureMask mask, void (*Set)(PrefilterPacketHeaderValue *v, void *),
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bool (*Compare)(PrefilterPacketHeaderValue v, void *),
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void (*Match)(DetectEngineThreadCtx *det_ctx, Packet *p, const void *pectx));
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static inline bool
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PrefilterPacketHeaderExtraMatch(const PrefilterPacketHeaderCtx *ctx,
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const Packet *p)
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{
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switch (ctx->type)
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{
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case PREFILTER_EXTRA_MATCH_UNUSED:
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break;
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case PREFILTER_EXTRA_MATCH_ALPROTO:
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if (p->flow == NULL || !AppProtoEquals(ctx->value, p->flow->alproto))
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return false;
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break;
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case PREFILTER_EXTRA_MATCH_SRCPORT:
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if (p->sp != ctx->value)
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return false;
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break;
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case PREFILTER_EXTRA_MATCH_DSTPORT:
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if (p->dp != ctx->value)
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return false;
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break;
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}
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return true;
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}
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static inline bool PrefilterIsPrefilterableById(const Signature *s, enum DetectKeywordId kid)
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{
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const SigMatch *sm;
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for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
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if (sm->type == kid) {
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return true;
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}
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}
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return false;
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}
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#endif /* SURICATA_DETECT_ENGINE_PREFILTER_COMMON_H */
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