1. 19 Jan, 2014 1 commit
    • Michal Sekletar's avatar
      net: introduce SO_BPF_EXTENSIONS · ea02f941
      Michal Sekletar authored
      For user space packet capturing libraries such as libpcap, there's
      currently only one way to check which BPF extensions are supported
      by the kernel, that is, commit aa1113d9 ("net: filter: return
      -EINVAL if BPF_S_ANC* operation is not supported"). For querying all
      extensions at once this might be rather inconvenient.
      
      Therefore, this patch introduces a new option which can be used as
      an argument for getsockopt(), and allows one to obtain information
      about which BPF extensions are supported by the current kernel.
      
      As David Miller suggests, we do not need to define any bits right
      now and status quo can just return 0 in order to state that this
      versions supports SKF_AD_PROTOCOL up to SKF_AD_PAY_OFFSET. Later
      additions to BPF extensions need to add their bits to the
      bpf_tell_extensions() function, as documented in the comment.
      Signed-off-by: default avatarMichal Sekletar <msekleta@redhat.com>
      Cc: David Miller <davem@davemloft.net>
      Reviewed-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ea02f941
  2. 18 Jan, 2014 39 commits