16 Mar, 2015

1 commit

• 614cd3bd3   samples: bpf: add skb->field examples and tests ... Browse Code »

  - modify sockex1 example to count number of bytes in outgoing packets
  - modify sockex2 example to count number of bytes and packets per flow
  - add 4 stress tests that exercise 'skb->field' code path of verifier

  Signed-off-by: Alexei Starovoitov
  Signed-off-by: David S. Miller

  Alexei Starovoitov

  2015-03-16 10:02:28 +0800  

06 Dec, 2014

1 commit

• a80857822   samples: bpf: trivial eBPF program in C ... Browse Code »

  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
  Signed-off-by: David S. Miller

  Alexei Starovoitov

  2014-12-06 13:47:33 +0800