icmp.hpp

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef __LINUX_ROUTING_FILTER_ICMP_HPP__
#define __LINUX_ROUTING_FILTER_ICMP_HPP__

#include <string>
#include <vector>

#include <stout/ip.hpp>
#include <stout/option.hpp>
#include <stout/result.hpp>
#include <stout/try.hpp>

#include "linux/routing/handle.hpp"

#include "linux/routing/filter/action.hpp"
#include "linux/routing/filter/filter.hpp"
#include "linux/routing/filter/priority.hpp"

namespace routing {
namespace filter {
namespace icmp {

struct Classifier
{
  explicit Classifier(const Option<net::IP>& _destinationIP)
    : destinationIP(_destinationIP) {}

  bool operator==(const Classifier& that) const
  {
    return destinationIP == that.destinationIP;
  }

  // TODO(evelinad): Replace net::IP with net::IP::Network when we will
  // support classifiers for the entire subnet.
  Option<net::IP> destinationIP;
};


// Returns true if there exists an ICMP packet filter attached to the
// given parent on the link which matches the specified classifier.
Try<bool> exists(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier);


// Creates an ICMP packet filter attached to the given parent on the
// link which will redirect all the ICMP packets that satisfy the
// conditions specified by the classifier to the target link. Returns
// false if an ICMP packet filter attached to the given parent with
// the same classifier already exists. The user can choose to specify
// an optional priority for the filter.
Try<bool> create(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier,
    const Option<Priority>& priority,
    const action::Redirect& redirect);


// Creates an ICMP packet filter attached to the given parent on the
// link which will mirror all the ICMP packets that satisfy the
// conditions specified by the classifier to a set of links (specified
// in the mirror action). Returns false if an ICMP packet filter
// attached to the given parent with the same classifier already
// exists. The user can choose to specify an optional priority for the
// filter.
Try<bool> create(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier,
    const Option<Priority>& priority,
    const action::Mirror& mirror);


// Creates an ICMP packet filter attached to the given parent on the
// link which will set the classid for packets that satisfy the
// conditions specified by the classifier. Returns false if an ICMP
// packet filter attached to the given parent with the same classifier
// already exists. The user can choose to specify an optional priority
// for the filter.
Try<bool> create(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier,
    const Option<Priority>& priority,
    const Option<Handle>& classid);


// Removes the ICMP packet filter attached to the given parent that
// matches the specified classifier from the link. Returns false if
// such a filter is not found.
Try<bool> remove(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier);


// Updates the action of the ICMP packet filter attached to the given
// parent that matches the specified classifier on the link. Returns
// false if such a filter is not found.
Try<bool> update(
    const std::string& link,
    const Handle& parent,
    const Classifier& classifier,
    const action::Mirror& mirror);


// Returns the classifiers of all the ICMP packet filters attached to
// the given parent on the link. Returns None if the link or the
// parent is not found.
Result<std::vector<Classifier>> classifiers(
    const std::string& link,
    const Handle& parent);

} // namespace icmp {
} // namespace filter {
} // namespace routing {

#endif // __LINUX_ROUTING_FILTER_ICMP_HPP__