nova/doc/api_samples/os-security-groups/security-group-rules-post-resp.json

{
    "security_group_rule": {
        "from_port": 22,
        "group": {},
        "id": "00000000-0000-0000-0000-000000000000",
        "ip_protocol": "tcp",
        "ip_range": {
            "cidr": "10.0.0.0/24"
        },
        "parent_group_id": "11111111-1111-1111-1111-111111111111",
        "to_port": 22
    }
}