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nfqws: wssize

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bol-van
2021-03-12 14:33:48 +03:00
parent 76e52c350b
commit 53f36c7297
21 changed files with 156 additions and 86 deletions
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39
nfq/darkmagic.c
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@@ -648,3 +648,42 @@ bool tcp_synack_segment(const struct tcphdr *tcphdr)
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == (TH_ACK|TH_SYN));
}
bool tcp_syn_segment(const struct tcphdr *tcphdr)
{
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == TH_SYN);
}
bool tcp_ack_segment(const struct tcphdr *tcphdr)
{
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == TH_ACK);
}
void tcp_rewrite_wscale(struct tcphdr *tcp, uint8_t scale_factor)
{
uint8_t *scale,scale_factor_old;
if (scale_factor!=(uint8_t)-1)
{
scale = tcp_find_option(tcp,3); // tcp option 3 - scale factor
if (scale && scale[1]==3) // length should be 3
{
scale_factor_old=scale[2];
scale[2]=scale_factor;
if (scale_factor_old!=scale_factor)
DLOG("Scale factor change %u => %u\n", scale_factor_old, scale_factor)
}
}
}
// scale_factor=-1 - do not change
void tcp_rewrite_winsize(struct tcphdr *tcp, uint16_t winsize, uint8_t scale_factor)
{
uint16_t winsize_old;
uint8_t *scale,scale_factor_old;
winsize_old = htons(tcp->th_win); // << scale_factor;
tcp->th_win = htons(winsize);
DLOG("Window size change %u => %u\n", winsize_old, winsize)
tcp_rewrite_wscale(tcp, scale_factor);
}