mirror of
https://github.com/bol-van/zapret.git
synced 2024-11-11 17:29:16 +05:00
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
#pragma once
|
|
|
|
// this conntrack is not bullet-proof
|
|
// its designed to satisfy dpi desync needs only
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <time.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet/tcp.h>
|
|
#include <netinet/udp.h>
|
|
|
|
//#define HASH_BLOOM 20
|
|
#define HASH_NONFATAL_OOM 1
|
|
#undef HASH_FUNCTION
|
|
#define HASH_FUNCTION HASH_BER
|
|
#include "uthash.h"
|
|
|
|
#define RETRANS_COUNTER_STOP ((uint8_t)-1)
|
|
|
|
typedef union {
|
|
struct in_addr ip;
|
|
struct in6_addr ip6;
|
|
} t_addr;
|
|
typedef struct
|
|
{
|
|
t_addr src, dst;
|
|
uint16_t sport,dport;
|
|
uint8_t l3proto; // IPPROTO_IP, IPPROTO_IPV6
|
|
uint8_t l4proto; // IPPROTO_TCP, IPPROTO_UDP
|
|
} t_conn;
|
|
|
|
// SYN - SYN or SYN/ACK received
|
|
// ESTABLISHED - any except SYN or SYN/ACK received
|
|
// FIN - FIN or RST received
|
|
typedef enum {SYN=0, ESTABLISHED, FIN} t_connstate;
|
|
typedef enum {UNKNOWN=0, HTTP, TLS, QUIC, WIREGUARD, DHT} t_l7proto;
|
|
typedef struct
|
|
{
|
|
// common state
|
|
time_t t_start, t_last;
|
|
uint64_t pcounter_orig, pcounter_reply; // packet counter
|
|
uint64_t pdcounter_orig, pdcounter_reply; // data packet counter (with payload)
|
|
uint32_t pos_orig, pos_reply; // TCP: seq_last+payload, ack_last+payload UDP: sum of all seen payload lenghts including current
|
|
uint32_t seq_last, ack_last; // TCP: last seen seq and ack UDP: sum of all seen payload lenghts NOT including current
|
|
|
|
// tcp only state, not used in udp
|
|
t_connstate state;
|
|
uint32_t seq0, ack0; // starting seq and ack
|
|
uint16_t winsize_orig, winsize_reply; // last seen window size
|
|
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 b_cutoff; // mark for deletion
|
|
bool b_wssize_cutoff, b_desync_cutoff;
|
|
|
|
t_l7proto l7proto;
|
|
char *hostname;
|
|
} t_ctrack;
|
|
|
|
typedef struct
|
|
{
|
|
t_ctrack track;
|
|
UT_hash_handle hh; // makes this structure hashable
|
|
t_conn conn; // key
|
|
} t_conntrack_pool;
|
|
typedef struct
|
|
{
|
|
// inactivity time to purge an entry in each connection state
|
|
uint32_t timeout_syn,timeout_established,timeout_fin,timeout_udp;
|
|
time_t t_purge_interval, t_last_purge;
|
|
t_conntrack_pool *pool;
|
|
} t_conntrack;
|
|
|
|
void ConntrackPoolInit(t_conntrack *p, time_t purge_interval, uint32_t timeout_syn, uint32_t timeout_established, uint32_t timeout_fin, uint32_t timeout_udp);
|
|
void ConntrackPoolDestroy(t_conntrack *p);
|
|
bool ConntrackPoolFeed(t_conntrack *p, const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcphdr, const struct udphdr *udphdr, size_t len_payload, t_ctrack **ctrack, bool *bReverse);
|
|
bool ConntrackPoolDrop(t_conntrack *p, const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcphdr, const struct udphdr *udphdr);
|
|
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);
|