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Comments for managing functions

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This commit is contained in:
Vadim Vetrov
2024-08-11 11:40:13 +03:00
parent 2e96aa150e
commit 6df3b53d7a
2 changed files with 34 additions and 5 deletions
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33
mangle.h
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@@ -31,28 +31,50 @@ typedef __u32 uint32_t;
#include <netinet/tcp.h>
#endif
struct verdict {
/**
* Result of analyze_tls_data function
*/
struct tls_verdict {
int target_sni; /* google video hello packet */
int sni_offset; /* offset from start of tcp _payload_ */
int sni_len;
};
struct verdict analyze_tls_data(const uint8_t *data, uint32_t dlen);
/**
* Processes the packet and finds TLS Client Hello information inside it.
* data pointer points to start of TLS Message (TCP Payload)
*/
struct tls_verdict analyze_tls_data(const uint8_t *data, uint32_t dlen);
/**
* Splits the packet to two IP fragments on position payload_offset.
* payload_offset indicates the position relatively to start of IP payload
* (start of transport header)
*/
int ip4_frag(const uint8_t *pkt, uint32_t pktlen,
uint32_t payload_offset,
uint8_t *frag1, uint32_t *f1len,
uint8_t *frag2, uint32_t *f2len);
/**
* Splits the packet to two TCP segments on position payload_offset
* payload_offset indicates the position relatively to start of TCP payload.
*/
int tcp4_frag(const uint8_t *pkt, uint32_t pktlen,
uint32_t payload_offset,
uint8_t *seg1, uint32_t *s1len,
uint8_t *seg2, uint32_t *s2len);
/**
* Splits the raw packet payload to ip header and ip payload.
*/
int ip4_payload_split(uint8_t *pkt, uint32_t buflen,
struct iphdr **iph, uint32_t *iph_len,
uint8_t **payload, uint32_t *plen);
/**
* Splits the raw packet payload to ip header, tcp header and tcp payload.
*/
int tcp4_payload_split(uint8_t *pkt, uint32_t buflen,
struct iphdr **iph, uint32_t *iph_len,
struct tcphdr **tcph, uint32_t *tcph_len,
@@ -61,9 +83,16 @@ int tcp4_payload_split(uint8_t *pkt, uint32_t buflen,
void tcp4_set_checksum(struct tcphdr *tcph, struct iphdr *iph);
void ip4_set_checksum(struct iphdr *iph);
/**
* Generates fake client hello message
*/
int gen_fake_sni(const struct iphdr *iph, const struct tcphdr *tcph,
uint8_t *buf, uint32_t *buflen);
/**
* Invalidates the raw packet. The function aims to invalid the packet
* in such way as it will be accepted by DPI, but dropped by target server
*/
int fail4_packet(uint8_t *payload, uint32_t plen);
#define PKT_ACCEPT 0