Mirror/zapret
1
0
Fork 0
mirror of https://github.com/bol-van/zapret.git synced 2025-12-31 11:55:55 +03:00
Code Issues Packages Projects Releases Wiki Activity

nfqws: udp protocol desync

Browse Source
This commit is contained in:
bol-van
2022-01-01 20:22:04 +03:00
parent 566e3d1536
commit 65830eb665
21 changed files with 1048 additions and 736 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
nfq/checksum.c
View File

@@ -11,6 +11,9 @@ static uint16_t from64to16(uint64_t x)
return (uint16_t)u + (uint16_t)(u>>16);
}
// this function preserves data alignment requirements (otherwise it will be damn slow on mips arch)
// and uses 64-bit arithmetics to improve speed
// taken from linux source code
static uint16_t do_csum(const uint8_t * buff, size_t len)
{
uint8_t odd;
@@ -122,12 +125,12 @@ uint16_t csum_ipv6_magic(const void *saddr, const void *daddr, size_t len, uint8
void tcp4_fix_checksum(struct tcphdr *tcp,size_t len, const struct in_addr *src_addr, const struct in_addr *dest_addr)
{
tcp->th_sum = 0;
tcp->th_sum = csum_tcpudp_magic(src_addr->s_addr,dest_addr->s_addr,len,IPPROTO_TCP,csum_partial(tcp, len));
tcp->th_sum = csum_tcpudp_magic(src_addr->s_addr,dest_addr->s_addr,len,IPPROTO_TCP,csum_partial(tcp,len));
}
void tcp6_fix_checksum(struct tcphdr *tcp,size_t len, const struct in6_addr *src_addr, const struct in6_addr *dest_addr)
{
tcp->th_sum = 0;
tcp->th_sum = csum_ipv6_magic(src_addr,dest_addr,len,IPPROTO_TCP,csum_partial(tcp, len));
tcp->th_sum = csum_ipv6_magic(src_addr,dest_addr,len,IPPROTO_TCP,csum_partial(tcp,len));
}
void tcp_fix_checksum(struct tcphdr *tcp,size_t len,const struct ip *ip,const struct ip6_hdr *ip6hdr)
{
@@ -136,3 +139,21 @@ void tcp_fix_checksum(struct tcphdr *tcp,size_t len,const struct ip *ip,const st
else if (ip6hdr)
tcp6_fix_checksum(tcp, len, &ip6hdr->ip6_src, &ip6hdr->ip6_dst);
}
void udp4_fix_checksum(struct udphdr *udp,size_t len, const struct in_addr *src_addr, const struct in_addr *dest_addr)
{
udp->uh_sum = 0;
udp->uh_sum = csum_tcpudp_magic(src_addr->s_addr,dest_addr->s_addr,len,IPPROTO_UDP,csum_partial(udp,len));
}
void udp6_fix_checksum(struct udphdr *udp,size_t len, const struct in6_addr *src_addr, const struct in6_addr *dest_addr)
{
udp->uh_sum = 0;
udp->uh_sum = csum_ipv6_magic(src_addr,dest_addr,len,IPPROTO_UDP,csum_partial(udp,len));
}
void udp_fix_checksum(struct udphdr *udp,size_t len,const struct ip *ip,const struct ip6_hdr *ip6hdr)
{
if (ip)
udp4_fix_checksum(udp, len, &ip->ip_src, &ip->ip_dst);
else if (ip6hdr)
udp6_fix_checksum(udp, len, &ip6hdr->ip6_src, &ip6hdr->ip6_dst);
}