#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <bpf/bpf_helpers.h> SEC("xdp")
int xdp_filter_iot(struct xdp_md *ctx) { void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; struct ethhdr *eth = data; if ((void *)(eth + 1) > data_end) return XDP_PASS; if (eth->h_proto != __constant_htons(ETH_P_IP)) return XDP_PASS; struct iphdr *iph = (void *)(eth + 1); if ((void *)(iph + 1) > data_end) return XDP_PASS; // Only allow traffic from the authorized Management IP: 192.168.1.50 // (Hex representation: 0x3201A8C0) if (iph->saddr != 0x3201A8C0) { return XDP_DROP; // Drop unauthorized traffic at the kernel level } return XDP_PASS; // Allow authorized traffic
} char _license[] SEC("license") = "GPL";
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <bpf/bpf_helpers.h> SEC("xdp")
int xdp_filter_iot(struct xdp_md *ctx) { void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; struct ethhdr *eth = data; if ((void *)(eth + 1) > data_end) return XDP_PASS; if (eth->h_proto != __constant_htons(ETH_P_IP)) return XDP_PASS; struct iphdr *iph = (void *)(eth + 1); if ((void *)(iph + 1) > data_end) return XDP_PASS; // Only allow traffic from the authorized Management IP: 192.168.1.50 // (Hex representation: 0x3201A8C0) if (iph->saddr != 0x3201A8C0) { return XDP_DROP; // Drop unauthorized traffic at the kernel level } return XDP_PASS; // Allow authorized traffic
} char _license[] SEC("license") = "GPL";
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <bpf/bpf_helpers.h> SEC("xdp")
int xdp_filter_iot(struct xdp_md *ctx) { void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; struct ethhdr *eth = data; if ((void *)(eth + 1) > data_end) return XDP_PASS; if (eth->h_proto != __constant_htons(ETH_P_IP)) return XDP_PASS; struct iphdr *iph = (void *)(eth + 1); if ((void *)(iph + 1) > data_end) return XDP_PASS; // Only allow traffic from the authorized Management IP: 192.168.1.50 // (Hex representation: 0x3201A8C0) if (iph->saddr != 0x3201A8C0) { return XDP_DROP; // Drop unauthorized traffic at the kernel level } return XDP_PASS; // Allow authorized traffic
} char _license[] SEC("license") = "GPL"; - Snort/Suricata: Primarily signature-based. They are great for detecting known exploits but can be resource-intensive, making them difficult to run on low-power edge devices like a Raspberry Pi.- Zeek (formerly Bro): Excellent for network metadata and behavioral analysis. However, it requires a significant amount of configuration to handle proprietary OT protocols.- HookProbe NAPSE: Designed specifically for the edge. NAPSE uses an AI-native approach that combines the best of signature-based detection with advanced behavioral modeling. It is optimized to run on edge hardware, providing a viable path for those asking how to set up IDS on raspberry pi or other ARM-based gateways.
