Files
xdp_filter/bridge_xdp.c
T
rodrigo f5231200d8 commit
Signed-off-by: Rodrigo Martins <rodrigo.sousa.577@gmail.com>
2025-03-23 21:22:58 -03:00

33 lines
828 B
C

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <linux/if_ether.h>
#include "bridge_xdp.h"
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);
}
// Verificar se é broadcast/multicast
if (eth->h_dest[0] & 1)
return XDP_PASS; // Deixar o kernel processar
return XDP_TX; // Enviar pacote diretamente
}
char _license[] SEC("license") = "GPL";