// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.net.filter;

using fuchsia.net;

/// Direction is which way (Incoming or Outgoing) a packet is moving in the stack.
enum Direction {
    incoming = 0;
    outgoing = 1;
};

enum Action {
    pass = 0;
    drop = 1;
    drop_reset = 2;
};

enum SocketProtocol {
    ip = 0;
    icmp = 1;
    tcp = 6;
    udp = 17;
    ipv6 = 41;
    icmpv6 = 58;
};

/// Rule describes the conditions and the action of a rule.
struct Rule {
    Action action;
    Direction direction;
    /// If true, no more rules will be tested.
    bool quick;
    SocketProtocol proto;
    fuchsia.net.Subnet? src_subnet;
    /// If true, matches any address that is NOT contained in the subnet.
    bool src_subnet_invert_match;
    uint16 src_port;
    fuchsia.net.Subnet? dst_subnet;
    /// If true, matches any address that is NOT contained in the subnet.
    bool dst_subnet_invert_match;
    uint16 dst_port;
    uint32 nic;
    bool log;
    bool keepState;
};

/// NAT is a special rule for Network Address Translation, which rewrites
/// the address of an outgoing packet.
struct NAT {
    SocketProtocol proto;
    fuchsia.net.Subnet src_subnet;
    fuchsia.net.IpAddress new_src_addr;
    uint32 nic;
};

/// RDR is a special rule for Redirector, which forwards an incoming packet
/// to a machine inside the firewall.
struct RDR {
    SocketProtocol proto;
    fuchsia.net.IpAddress dst_addr;
    uint16 dst_port;
    fuchsia.net.IpAddress new_dst_addr;
    uint16 new_dst_port;
    uint32 nic;
};