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for bisybox

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Lain Iwakura 2025-07-18 14:58:10 +03:00
parent f2b020d0a4
commit 08243754f5
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GPG Key ID: C7C18257F2ADC6F8
1 changed files with 35 additions and 7 deletions
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42
xdp.c
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@ -95,20 +95,48 @@ int pinger(struct xdp_md* ctx) {
__u64* ts_secs = (void*)(icmphdr + 1);
__u8* payload = (void*)(icmphdr + 1);
int is_bsd = 0;
int ping_type = 0; // 0=linux, 1=bsd, 2=busybox
// Check payload size and signature to determine ping type
if ((void*)(payload + 16) <= data_end) {
// Check for BSD ping signature: 0x08, 0x09, 0x0a, 0x0b, ...
if (payload[8] == 0x08 && payload[9] == 0x09 && payload[10] == 0x0a && payload[11] == 0x0b &&
payload[12] == 0x0c && payload[13] == 0x0d && payload[14] == 0x0e && payload[15] == 0x0f) {
is_bsd = 1;
ping_type = 1; // BSD ping
}
}
if ((void*)(ts_secs + 1) <= data_end) {
__u64 old_secs = *ts_secs;
*ts_secs -= bpf_get_prandom_u32() % 500;
recalc_icmp_csum(icmphdr, old_secs, *ts_secs);
// Check for BusyBox ping (smaller payload, no specific signature)
if (ping_type == 0 && (void*)(payload + 8) <= data_end) {
// If payload is small and doesn't have BSD signature, likely BusyBox
if ((void*)(payload + 16) > data_end ||
(payload[8] != 0x08 && payload[9] != 0x09 && payload[10] != 0x0a && payload[11] != 0x0b)) {
ping_type = 2; // BusyBox ping
}
}
if (!is_bsd) {
if (ping_type == 2) {
// BusyBox: mutate only first 4 bytes (uint32_t timestamp)
__u32* ts_busybox = (void*)(icmphdr + 1);
if ((void*)(ts_busybox + 1) <= data_end) {
__u32 old_ts = *ts_busybox;
*ts_busybox -= bpf_get_prandom_u32() % 500;
recalc_icmp_csum(icmphdr, old_ts, *ts_busybox);
}
} else if (ping_type == 1) {
// BSD: mutate only first 8 bytes (timestamp)
if ((void*)(ts_secs + 1) <= data_end) {
__u64 old_secs = *ts_secs;
*ts_secs -= bpf_get_prandom_u32() % 500;
recalc_icmp_csum(icmphdr, old_secs, *ts_secs);
}
} else {
// Linux: mutate both 8-byte timestamps
if ((void*)(ts_secs + 1) <= data_end) {
__u64 old_secs = *ts_secs;
*ts_secs -= bpf_get_prandom_u32() % 500;
recalc_icmp_csum(icmphdr, old_secs, *ts_secs);
}
__u64* ts_nsecs = (void*)(icmphdr + 1) + sizeof(__u64);
if ((void*)ts_nsecs + sizeof(__u64) <= data_end) {
__u64 old_nsecs = *ts_nsecs;