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nfqws: allow hopbyhop with 2nd phase desync

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bol-van
2022-02-02 15:18:35 +03:00
parent f0a9246fd9
commit 707e86bd90
15 changed files with 98 additions and 21 deletions
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22
nfq/darkmagic.c
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@@ -16,6 +16,10 @@ uint32_t net32_add(uint32_t netorder_value, uint32_t cpuorder_increment)
{
return htonl(ntohl(netorder_value)+cpuorder_increment);
}
uint32_t net16_add(uint16_t netorder_value, uint16_t cpuorder_increment)
{
return htons(ntohs(netorder_value)+cpuorder_increment);
}
uint8_t *tcp_find_option(struct tcphdr *tcp, uint8_t kind)
{
@@ -346,7 +350,23 @@ bool prepare_udp_segment(
false;
}
bool ip6_insert_hopbyhop(uint8_t *data_pkt, size_t len_pkt, uint8_t *buf, size_t *buflen)
{
if ((len_pkt+8)<=*buflen && len_pkt>=sizeof(struct ip6_hdr))
{
struct ip6_hdr *ip6 = (struct ip6_hdr *)buf;
struct ip6_hbh *hbh = (struct ip6_hbh*)(ip6+1);
*ip6 = *(struct ip6_hdr*)data_pkt;
memset(hbh,0,8);
memcpy((uint8_t*)hbh+8, data_pkt+sizeof(struct ip6_hdr), len_pkt-sizeof(struct ip6_hdr));
hbh->ip6h_nxt = ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt;
ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt = 0;
ip6->ip6_ctlun.ip6_un1.ip6_un1_plen = net16_add(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen, 8);
*buflen = len_pkt + 8;
return true;
}
return false;
}
// split ipv4 packet into 2 fragments at data payload position frag_pos
bool ip_frag4(