PF_KEY_V2
hdr->sadb_msg_version = PF_KEY_V2;
if (protocol != PF_KEY_V2)
hdr->sadb_msg_version = PF_KEY_V2;
out_hdr->sadb_msg_version = PF_KEY_V2;
hdr->sadb_msg_version = PF_KEY_V2;
if (hdr->sadb_msg_version != PF_KEY_V2 ||
out_hdr->sadb_msg_version = PF_KEY_V2;
hdr->sadb_msg_version = PF_KEY_V2;
hdr->sadb_msg_version = PF_KEY_V2;
hdr->sadb_msg_version = PF_KEY_V2;