1. 06 Dec, 2017 3 commits
  2. 05 Dec, 2017 1 commit
    • Lawrence Brakmo's avatar
      bpf: Add access to snd_cwnd and others in sock_ops · f19397a5
      Lawrence Brakmo authored
      Adds read access to snd_cwnd and srtt_us fields of tcp_sock. Since these
      fields are only valid if the socket associated with the sock_ops program
      call is a full socket, the field is_fullsock is also added to the
      bpf_sock_ops struct. If the socket is not a full socket, reading these
      fields returns 0.
      
      Note that in most cases it will not be necessary to check is_fullsock to
      know if there is a full socket. The context of the call, as specified by
      the 'op' field, can sometimes determine whether there is a full socket.
      
      The struct bpf_sock_ops has the following fields added:
      
        __u32 is_fullsock;      /* Some TCP fields are only valid if
                                 * there is a full socket. If not, the
                                 * fields read as zero.
      			   */
        __u32 snd_cwnd;
        __u32 srtt_us;          /* Averaged RTT << 3 in usecs */
      
      There is a new macro, SOCK_OPS_GET_TCP32(NAME), to make it easier to add
      read access to more 32 bit tcp_sock fields.
      Signed-off-by: default avatarLawrence Brakmo <brakmo@fb.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      f19397a5
  3. 04 Dec, 2017 16 commits
  4. 03 Dec, 2017 20 commits