ah_present, esp_present, comp_present
              Set to yes if an AH, ESP, or compression proposal was received
              respectively, no otherwise.

     app_domain
              Always set to IPsec policy.

     comp_alg
              One of oui, deflate, lzs, or v42bis, based on the compression
              algorithm specified in the compression proposal.

     comp_dict_size
              Specifies the log2 maximum size of the dictionary, according to
              the compression proposal.