31 lines
657 B
C
31 lines
657 B
C
#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_ether.h>
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#include <uapi/linux/if_packet.h>
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#include <uapi/linux/ip.h>
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#include "bpf_helpers.h"
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#include "bpf_legacy.h"
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32);
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__type(value, long);
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__uint(max_entries, 256);
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} my_map SEC(".maps");
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SEC("socket1")
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int bpf_prog1(struct __sk_buff *skb)
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{
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int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
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long *value;
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if (skb->pkt_type != PACKET_OUTGOING)
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return 0;
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value = bpf_map_lookup_elem(&my_map, &index);
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if (value)
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__sync_fetch_and_add(value, skb->len);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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