drygdryg/zapret
1
0
Fork 0
mirror of https://github.com/bol-van/zapret.git synced 2025-08-10 01:02:03 +03:00
Code Issues Packages Projects Releases Wiki Activity

nfqws: copy DF ip flag

Browse Source
This commit is contained in:
bol-van
2025-04-29 13:35:31 +03:00
parent 50539d6cbf
commit d2c9ff50cd
3 changed files with 52 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
nfq/darkmagic.c
View File

@@ -38,6 +38,11 @@ uint32_t net16_add(uint16_t netorder_value, uint16_t cpuorder_increment)
return htons(ntohs(netorder_value)+cpuorder_increment);
}
bool ip_has_df(const struct ip *ip)
{
return ip && !!(ntohs(ip->ip_off) & IP_DF);
}
uint8_t *tcp_find_option(struct tcphdr *tcp, uint8_t kind)
{
uint8_t *t = (uint8_t*)(tcp+1);
@@ -189,11 +194,11 @@ static void fill_udphdr(struct udphdr *udp, uint16_t nsport, uint16_t ndport, ui
udp->uh_sum = 0;
}
static void fill_iphdr(struct ip *ip, const struct in_addr *src, const struct in_addr *dst, uint16_t pktlen, uint8_t proto, uint8_t ttl, uint8_t tos, uint16_t ip_id)
static void fill_iphdr(struct ip *ip, const struct in_addr *src, const struct in_addr *dst, uint16_t pktlen, uint8_t proto, bool DF, uint8_t ttl, uint8_t tos, uint16_t ip_id)
{
ip->ip_tos = tos;
ip->ip_sum = 0;
ip->ip_off = 0;
ip->ip_off = DF ? htons(IP_DF) : 0;
ip->ip_v = 4;
ip->ip_hl = 5;
ip->ip_len = htons(pktlen);
@@ -222,6 +227,7 @@ bool prepare_tcp_segment4(
uint16_t nwsize,
uint8_t scale_factor,
uint32_t *timestamps,
bool DF,
uint8_t ttl,
uint8_t tos,
uint16_t ip_id,
@@ -240,7 +246,7 @@ bool prepare_tcp_segment4(
struct tcphdr *tcp = (struct tcphdr*)(ip+1);
uint8_t *payload = (uint8_t*)(tcp+1)+tcpoptlen;
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_TCP, ttl, tos, ip_id);
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_TCP, DF, ttl, tos, ip_id);
fill_tcphdr(tcp,fooling,tcp_flags,sack,nmss,nseq,nack_seq,src->sin_port,dst->sin_port,nwsize,scale_factor,timestamps,badseq_increment,badseq_ack_increment,len);
memcpy(payload,data,len);
@@ -346,6 +352,7 @@ bool prepare_tcp_segment(
uint16_t nwsize,
uint8_t scale_factor,
uint32_t *timestamps,
bool DF,
uint8_t ttl,
uint8_t tos,
uint16_t ip_id,
@@ -357,7 +364,7 @@ bool prepare_tcp_segment(
uint8_t *buf, size_t *buflen)
{
return (src->sa_family==AF_INET && dst->sa_family==AF_INET) ?
prepare_tcp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,tcp_flags,sack,nmss,nseq,nack_seq,nwsize,scale_factor,timestamps,ttl,tos,ip_id,fooling,badseq_increment,badseq_ack_increment,data,len,buf,buflen) :
prepare_tcp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,tcp_flags,sack,nmss,nseq,nack_seq,nwsize,scale_factor,timestamps,DF,ttl,tos,ip_id,fooling,badseq_increment,badseq_ack_increment,data,len,buf,buflen) :
(src->sa_family==AF_INET6 && dst->sa_family==AF_INET6) ?
prepare_tcp_segment6((struct sockaddr_in6 *)src,(struct sockaddr_in6 *)dst,tcp_flags,sack,nmss,nseq,nack_seq,nwsize,scale_factor,timestamps,ttl,flow_label,fooling,badseq_increment,badseq_ack_increment,data,len,buf,buflen) :
false;
@@ -367,6 +374,7 @@ bool prepare_tcp_segment(
// padlen<0 means payload shrinking
bool prepare_udp_segment4(
const struct sockaddr_in *src, const struct sockaddr_in *dst,
bool DF,
uint8_t ttl,
uint8_t tos,
uint16_t ip_id,
@@ -393,7 +401,7 @@ bool prepare_udp_segment4(
uint8_t *payload = (uint8_t*)(udp+1);
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_UDP, ttl, tos, ip_id);
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_UDP, DF, ttl, tos, ip_id);
fill_udphdr(udp, src->sin_port, dst->sin_port, datalen);
memcpy(payload,data,len);
@@ -498,6 +506,7 @@ bool prepare_udp_segment6(
}
bool prepare_udp_segment(
const struct sockaddr *src, const struct sockaddr *dst,
bool DF,
uint8_t ttl,
uint8_t tos,
uint16_t ip_id,
@@ -509,7 +518,7 @@ bool prepare_udp_segment(
uint8_t *buf, size_t *buflen)
{
return (src->sa_family==AF_INET && dst->sa_family==AF_INET) ?
prepare_udp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,ttl,tos,ip_id,fooling,padding,padding_size,padlen,data,len,buf,buflen) :
prepare_udp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,DF,ttl,tos,ip_id,fooling,padding,padding_size,padlen,data,len,buf,buflen) :
(src->sa_family==AF_INET6 && dst->sa_family==AF_INET6) ?
prepare_udp_segment6((struct sockaddr_in6 *)src,(struct sockaddr_in6 *)dst,ttl,flow_label,fooling,padding,padding_size,padlen,data,len,buf,buflen) :
false;