26 Jul, 2016

1 commit

• cf9b1199d   samples/bpf: Add test/example of using bpf_probe_write_user bpf helper ... Browse Code »

  This example shows using a kprobe to act as a dnat mechanism to divert
  traffic for arbitrary endpoints. It rewrite the arguments to a syscall
  while they're still in userspace, and before the syscall has a chance
  to copy the argument into kernel space.

  Although this is an example, it also acts as a test because the mapped
  address is 255.255.255.255:555 -> real address, and that's not a legal
  address to connect to. If the helper is broken, the example will fail
  on the intermediate steps, as well as the final step to verify the
  rewrite of userspace memory succeeded.

  Signed-off-by: Sargun Dhillon
  Cc: Alexei Starovoitov
  Cc: Daniel Borkmann
  Acked-by: Alexei Starovoitov
  Signed-off-by: David S. Miller

  Sargun Dhillon

  2016-07-26 09:07:48 +0800