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nfqws: tls client hello reassemble

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bol-van
2023-11-15 19:36:34 +03:00
parent f25f1f104b
commit a9a4cd5cb4
23 changed files with 377 additions and 149 deletions
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21
nfq/conntrack.h
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@@ -34,6 +34,14 @@ typedef struct
uint8_t l4proto; // IPPROTO_TCP, IPPROTO_UDP
} t_conn;
// this structure helps to reassemble continuous packets streams. it does not support out-of-orders
typedef struct {
uint8_t *packet; // allocated for size during reassemble request. requestor must know the message size.
uint32_t seq; // current seq number. if a packet comes with an unexpected seq - it fails reassemble session.
size_t size; // expected message size. success means that we have received exactly 'size' bytes and have them in 'packet'
size_t size_present; // how many bytes already stored in 'packet'
} t_reassemble;
// SYN - SYN or SYN/ACK received
// ESTABLISHED - any except SYN or SYN/ACK received
// FIN - FIN or RST received
@@ -55,11 +63,14 @@ typedef struct
uint8_t scale_orig, scale_reply; // last seen window scale factor. SCALE_NONE if none
uint8_t req_retrans_counter; // number of request retransmissions
uint32_t req_seq; // sequence number of the request (to track retransmissions)
bool req_seq_start_present, req_seq_present;
uint32_t req_seq_start,req_seq_end; // sequence interval of the request (to track retransmissions)
bool b_cutoff; // mark for deletion
bool b_wssize_cutoff, b_desync_cutoff;
t_reassemble reasm_orig;
t_l7proto l7proto;
char *hostname;
} t_ctrack;
@@ -85,3 +96,11 @@ bool ConntrackPoolDrop(t_conntrack *p, const struct ip *ip, const struct ip6_hdr
void CaonntrackExtractConn(t_conn *c, bool bReverse, const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcphdr, const struct udphdr *udphdr);
void ConntrackPoolDump(const t_conntrack *p);
void ConntrackPoolPurge(t_conntrack *p);
void ConntrackClearHostname(t_ctrack *track);
bool ReasmInit(t_reassemble *reasm, size_t size_requested, uint32_t seq_start);
void ReasmClear(t_reassemble *reasm);
// false means reassemble session has failed and we should ReasmClear() it
bool ReasmFeed(t_reassemble *reasm, uint32_t seq, const void *payload, size_t len);
inline static bool ReasmIsEmpty(t_reassemble *reasm) {return !reasm->size;}
inline static bool ReasmIsFull(t_reassemble *reasm) {return !ReasmIsEmpty(reasm) && (reasm->size==reasm->size_present);}