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mini fix

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PoliEcho
2026-09-18 16:14:47 +02:00
parent 47c1334e5e
commit 5effc8541c
1 changed files with 9 additions and 5 deletions
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src/main.c
+9 -5
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@@ -7,6 +7,8 @@
#define ETH_HEADER_SIZE 14 #define ETH_HEADER_SIZE 14
#define MAC_SIZE 6
#define ETHER_TYPE_FIELD_OFFSET 12 #define ETHER_TYPE_FIELD_OFFSET 12
#define ETHER_TYPE_IPV4 0x0800 #define ETHER_TYPE_IPV4 0x0800
@@ -218,7 +220,7 @@ int xdp_drop_prog(struct xdp_md *ctx) {
// check SYN // check SYN
if (tcp_flags & SYN_MASK) { if (tcp_flags & SYN_MASK) {
bpf_printk("packet is SYN\n"); bpf_printk("packet is SYN\n");
if (mulberry32_at((__u32)time_seed, dst_port) % 3 == 0) { if (/*mulberry32_at((__u32)time_seed, dst_port) % 3 == 0*/1) {
bpf_printk("DROPING!\n"); bpf_printk("DROPING!\n");
__u16 *src_port_ptr = (__u16 *)(tcp_packet_data + TCP_SRC_PORT_OFFSET); __u16 *src_port_ptr = (__u16 *)(tcp_packet_data + TCP_SRC_PORT_OFFSET);
const __u16 src_port = bpf_ntohs(*src_port_ptr); const __u16 src_port = bpf_ntohs(*src_port_ptr);
@@ -284,9 +286,6 @@ int xdp_drop_prog(struct xdp_md *ctx) {
&pseudo_header, &pseudo_header,
(const __u8 *)&pseudo_header + sizeof(pseudo_header), tmp_sum); (const __u8 *)&pseudo_header + sizeof(pseudo_header), tmp_sum);
} else { } else {
if (EtherType != ETHER_TYPE_IPV6) {
return XDP_PASS;
}
if (ip_packet_data + IPV6_HEADER_SIZE > data_end) { if (ip_packet_data + IPV6_HEADER_SIZE > data_end) {
return XDP_PASS; return XDP_PASS;
} }
@@ -319,7 +318,12 @@ int xdp_drop_prog(struct xdp_md *ctx) {
tcp_checksum = bpf_htons(tcp_checksum_fold(tmp_sum)); tcp_checksum = bpf_htons(tcp_checksum_fold(tmp_sum));
} }
*(__u16 *)(tcp_packet_data + TCP_CHECKSUM_OFFSET) = tcp_checksum; *(__u16 *)(tcp_packet_data + TCP_CHECKSUM_OFFSET) = tcp_checksum;
{ // swap SRC an dst MAC
__u8 src_mac[MAC_SIZE];
__builtin_memcpy(src_mac, data + MAC_SIZE, MAC_SIZE);
__builtin_memcpy((__u8 *)data + MAC_SIZE, data, MAC_SIZE);
__builtin_memcpy((__u8 *)data, src_mac, MAC_SIZE);
}
return XDP_TX; return XDP_TX;
} }
} else { } else {