commit

Signed-off-by: Rodrigo Martins <rodrigo.sousa.577@gmail.com>

bridge_xdp.c

@@ -0,0 +1,52 @@
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <linux/if_ether.h>
+#include "bridge_xdp.h"
+
+struct {
+    __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+    __uint(max_entries, 1);
+    __type(key, __u32);
+    __type(value, struct packet_stats);
+} stats_map SEC(".maps");
+
+SEC("xdp")
+int bridge_filter(struct xdp_md *ctx)
+{
+    void *data_end = (void *)(long)ctx->data_end;
+    void *data = (void *)(long)ctx->data;
+    struct ethhdr *eth = data;
+
+    // Verificação básica do header ethernet
+    if ((void*)(eth + 1) > data_end)
+        return XDP_ABORTED;
+
+    // Atualizar estatísticas
+    __u32 key = 0;
+    struct packet_stats *stats = bpf_map_lookup_elem(&stats_map, &key);
+    if (stats) {
+        stats->packets++;
+        stats->bytes += (data_end - data);
+    }
+
+    // Sempre permitir tráfego broadcast/multicast
+    if (eth->h_dest[0] & 1)
+        return XDP_PASS;
+
+    // Verificar se é tráfego IPv4
+    if (eth->h_proto == bpf_htons(ETH_P_IP)) {
+        struct iphdr *iph = (void*)(eth + 1);
+        if ((void*)(iph + 1) > data_end)
+            return XDP_PASS;  // Se não conseguir verificar, passa pro kernel
+
+        // Permitir todo tráfego local (entre containers)
+        if ((iph->daddr & 0xffff0000) == 0x0a0f0000) // 10.15.0.0/16
+            return XDP_PASS;
+    }
+
+    // Para outros protocolos, deixa passar
+    return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";