mirror of
https://github.com/Waujito/youtubeUnblock.git
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93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
#ifndef UTILS_H
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#define UTILS_H
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#include "types.h"
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#define IP4VERSION 4
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#define IP6VERSION 6
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/**
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* Splits the packet to two IP fragments on position payload_offset.
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* payload_offset indicates the position relatively to start of IP payload
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* (start of transport header)
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*/
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int ip4_frag(const uint8_t *pkt, uint32_t pktlen,
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uint32_t payload_offset,
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uint8_t *frag1, uint32_t *f1len,
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uint8_t *frag2, uint32_t *f2len);
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/**
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* Splits the packet to two TCP segments on position payload_offset
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* payload_offset indicates the position relatively to start of TCP payload.
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*/
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// int tcp4_frag(const uint8_t *pkt, uint32_t pktlen,
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// uint32_t payload_offset,
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// uint8_t *seg1, uint32_t *s1len,
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// uint8_t *seg2, uint32_t *s2len);
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int tcp_frag(const uint8_t *pkt, uint32_t pktlen,
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uint32_t payload_offset,
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uint8_t *seg1, uint32_t *s1len,
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uint8_t *seg2, uint32_t *s2len);
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/**
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* Splits the raw packet payload to ip header and ip payload.
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*/
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int ip4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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uint8_t **payload, uint32_t *plen);
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static inline int netproto_version(const uint8_t *pkt, uint32_t buflen) {
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if (pkt == NULL || buflen == 0)
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return -1;
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return (*pkt) >> 4;
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}
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/**
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* Splits the raw packet payload to ip header, tcp header and tcp payload.
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*/
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int tcp4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header and ip payload.
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*/
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int ip6_payload_split(uint8_t *pkt, uint32_t buflen,
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struct ip6_hdr **iph, uint32_t *iph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header, tcp header and tcp payload.
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*/
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int tcp6_payload_split(uint8_t *pkt, uint32_t buflen,
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struct ip6_hdr **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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int tcp_payload_split(uint8_t *pkt, uint32_t buflen,
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void **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header, udp header and udp payload.
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*/
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int udp4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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struct udphdr **udph,
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uint8_t **payload, uint32_t *plen);
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void tcp4_set_checksum(struct tcphdr *tcph, struct iphdr *iph);
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void ip4_set_checksum(struct iphdr *iph);
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void ip6_set_checksum(struct ip6_hdr *iph);
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void tcp6_set_checksum(struct tcphdr *tcph, struct ip6_hdr *iph);
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int set_ip_checksum(void *iph, uint32_t iphb_len);
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int set_tcp_checksum(struct tcphdr *tcph, void *iph, uint32_t iphb_len);
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#endif /* UTILS_H */
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