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22 lines
538 B
C
22 lines
538 B
C
// xdp_rewrite.c
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <linux/if_ether.h>
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SEC("xdp")
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int xdp_rewrite_mac(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct ethhdr *eth = data;
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if ((void*)(eth + 1) > data_end)
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return XDP_PASS;
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__u8 new_src[ETH_ALEN] = {0x02,0x00,0x00,0x00,0x00,0x02};
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for (int i = 0; i < ETH_ALEN; i++) eth->h_source[i] = new_src[i];
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return XDP_PASS;
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}
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char _license[] SEC("license") = "GPL";
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