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a80857822b
this example does the same task as previous socket example
in assembler, but this one does it in C.
eBPF program in kernel does:
/* assume that packet is IPv4, load one byte of IP->proto */
int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
long *value;
value = bpf_map_lookup_elem(&my_map, &index);
if (value)
__sync_fetch_and_add(value, 1);
Corresponding user space reads map[tcp], map[udp], map[icmp]
and prints protocol stats every second
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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|---|---|---|
| .. | ||
| bpf_helpers.h | ||
| bpf_load.c | ||
| bpf_load.h | ||
| libbpf.c | ||
| libbpf.h | ||
| Makefile | ||
| sock_example.c | ||
| sockex1_kern.c | ||
| sockex1_user.c | ||
| test_maps.c | ||
| test_verifier.c | ||