// ghost_gate_kern.c — XDP Ghost Gate — DoD Grade — Drops corporate IPs/ASNs at NIC
// SEC 17684-273-411-436 ZAXIS 0x3F8F9A1B2C3D XPS-2026-001-v10-LANE-VM
// RFC-SERIES-001 Speculative Compression — Binary Header 0x3F8F9A1B2C3D ISA 57000 VMM 17684
// Compiles to ghost_gate_kern.o — loaded via aya / bpftool
// CEOs: your telemetry never even gets a kernel stack frame.

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/ipv6.h>

struct {
    __uint(type, BPF_MAP_TYPE_HASH);
    __uint(max_entries, 65535);
    __type(key, __u32);   // IPv4 dest address (network byte order)
    __type(value, __u8);  // 1 = blocked
} blacklist_map SEC(".maps");

struct {
    __uint(type, BPF_MAP_TYPE_HASH);
    __uint(max_entries, 65535);
    __type(key, __u32);   // ASN
    __type(value, __u8);
} asn_blacklist_map SEC(".maps");

// Evidence ring buffer — aggressive proof of IP infringement
struct evidence_event {
    __u32 src_ip;
    __u32 dst_ip;
    __u64 timestamp;
    __u32 asn;
    __u8 action; // 1=DROP
};

struct {
    __uint(type, BPF_MAP_TYPE_RINGBUF);
    __uint(max_entries, 1 << 24);
} evidence_ring SEC(".maps");

SEC("xdp")
int xdp_ghost_gate(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;

    // Only IPv4 for now — IPv6 handled via second prog
    if (eth->h_proto != __constant_htons(ETH_P_IP))
        return XDP_PASS;

    struct iphdr *ip = (void *)(eth + 1);
    if ((void *)(ip + 1) > data_end)
        return XDP_PASS;

    __u32 dest_ip = ip->daddr;
    __u32 src_ip = ip->saddr;
    __u8 *blocked = bpf_map_lookup_elem(&blacklist_map, &dest_ip);
    if (!blocked) {
        blocked = bpf_map_lookup_elem(&blacklist_map, &src_ip);
    }

    if (blocked && *blocked == 1) {
        // Aggressive cryptographic proof — push to ring buffer
        struct evidence_event *e = bpf_ringbuf_reserve(&evidence_ring, sizeof(*e), 0);
        if (e) {
            e->src_ip = src_ip;
            e->dst_ip = dest_ip;
            e->timestamp = bpf_ktime_get_ns();
            e->asn = 0;
            e->action = 1;
            bpf_ringbuf_submit(e, 0);
        }
        // Engineers: instant oblivion for corporate probes
        // Data at rest on their servers remains encrypted — they store poison
        return XDP_DROP;
    }

    return XDP_PASS;
}

char _license[] SEC("license") = "GPL";