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Vector Packet Processing
nat_binding.hpp
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1 /*
2  * Copyright (c) 2017 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef __VOM_NAT_BINDING_H__
17 #define __VOM_NAT_BINDING_H__
18 
19 #include "vom/hw.hpp"
20 #include "vom/interface.hpp"
21 #include "vom/object_base.hpp"
22 #include "vom/om.hpp"
23 #include "vom/singular_db.hpp"
24 
25 namespace VOM {
26 /**
27  * A Class representing the binding of an L2 interface to a bridge-domain
28  * and the properties of that binding.
29  */
30 class nat_binding : public object_base
31 {
32 public:
33  /**
34  * NAT Zoness
35  */
36  struct zone_t : public enum_base<zone_t>
37  {
38  /**
39  * Constructor
40  */
41  zone_t(int v, const std::string s);
42 
43  /**
44  * Destructor
45  */
46  ~zone_t() = default;
47 
48  /**
49  * Permit Zone
50  */
51  const static zone_t INSIDE;
52 
53  /**
54  * Deny Zone
55  */
56  const static zone_t OUTSIDE;
57 
58  const static zone_t& from_vpp(u8 is_inside);
59  };
60 
61  /**
62  * The key for a NAT Binding.
63  * The zoe is not included, since the same interface is never inside
64  * and outside.
65  */
66  typedef std::tuple<interface::key_t, direction_t, l3_proto_t> key_t;
67 
68  /**
69  * Construct a new object matching the desried state
70  * @param itf The interface onto which we bind/apply the feature
71  * @param dir The direction (input/output)
72  * @param proto The L3 proto used inside.
73  * @param zone The NAT zone for the link
74  */
75  nat_binding(const interface& itf,
76  const direction_t& dir,
77  const l3_proto_t& proto,
78  const zone_t& zone);
79 
80  /**
81  * Copy Constructor
82  */
83  nat_binding(const nat_binding& o);
84 
85  /**
86  * Destructor
87  */
88  ~nat_binding();
89 
90  /**
91  * Comparison operator - for UT
92  */
93  bool operator==(const nat_binding& n) const;
94 
95  /**
96  * Return the binding's key
97  */
98  const key_t key() const;
99 
100  /**
101  * Return the 'singular instance' of the L2 config that matches this
102  * object
103  */
104  std::shared_ptr<nat_binding> singular() const;
105 
106  /**
107  * convert to string format for debug purposes
108  */
109  std::string to_string() const;
110 
111  /**
112  * Static function to find the bridge_domain in the model
113  */
114  static std::shared_ptr<nat_binding> find(const key_t& key);
115 
116  /**
117  * Dump all nat_bindings into the stream provided
118  */
119  static void dump(std::ostream& os);
120 
121 private:
122  /**
123  * Class definition for listeners to OM events
124  */
125  class event_handler : public OM::listener, public inspect::command_handler
126  {
127  public:
128  event_handler();
129  virtual ~event_handler() = default;
130 
131  /**
132  * Handle a populate event
133  */
134  void handle_populate(const client_db::key_t& key);
135 
136  /**
137  * Handle a replay event
138  */
139  void handle_replay();
140 
141  /**
142  * Show the object in the Singular DB
143  */
144  void show(std::ostream& os);
145 
146  /**
147  * Get the sortable Id of the listener
148  */
149  dependency_t order() const;
150  };
151 
152  /**
153  * event_handler to register with OM
154  */
155  static event_handler m_evh;
156 
157  /**
158  * Enquue commonds to the VPP command Q for the update
159  */
160  void update(const nat_binding& obj);
161 
162  /**
163  * Find or Add the singular instance in the DB
164  */
165  static std::shared_ptr<nat_binding> find_or_add(const nat_binding& temp);
166 
167  /*
168  * It's the OM class that calls singular()
169  */
170  friend class OM;
171 
172  /**
173  * It's the singular_db class that calls replay()
174  */
175  friend class singular_db<const key_t, nat_binding>;
176 
177  /**
178  * Sweep/reap the object if still stale
179  */
180  void sweep(void);
181 
182  /**
183  * replay the object to create it in hardware
184  */
185  void replay(void);
186 
187  /**
188  * HW configuration for the binding. The bool representing the
189  * do/don't bind.
190  */
191  HW::item<bool> m_binding;
192 
193  /**
194  * A reference counting pointer the interface that this NAT binding
195  * represents. By holding the reference here, we can guarantee that
196  * this object will outlive the interface
197  */
198  const std::shared_ptr<interface> m_itf;
199 
200  /**
201  * The direction in which the feature applies
202  */
203  direction_t m_dir;
204 
205  /**
206  * The L3 protocol used on the inside
207  */
208  l3_proto_t m_proto;
209 
210  /**
211  * The NAT zone the interface is in
212  */
213  zone_t m_zone;
214 
215  /**
216  * A map of all L2 interfaces key against the interface's handle_t
217  */
219 };
220 
221 std::ostream& operator<<(std::ostream& os, const nat_binding::key_t& key);
222 };
223 
224 /*
225  * fd.io coding-style-patch-verification: ON
226  *
227  * Local Variables:
228  * eval: (c-set-style "mozilla")
229  * End:
230  */
231 
232 #endif
~nat_binding()
Destructor.
Definition: nat_binding.cpp:64
static const zone_t OUTSIDE
Deny Zone.
Definition: nat_binding.hpp:56
~zone_t()=default
Destructor.
A template base class for all enum types.
Definition: enum_base.hpp:30
const std::string key_t
In the opflex world each entity is known by a URI which can be converted into a string.
Definition: client_db.hpp:51
Types belonging to Routing.
Definition: prefix.hpp:32
A Class representing the binding of an L2 interface to a bridge-domain and the properties of that bin...
Definition: nat_binding.hpp:30
nat_binding(const interface &itf, const direction_t &dir, const l3_proto_t &proto, const zone_t &zone)
Construct a new object matching the desried state.
Definition: nat_binding.cpp:43
Feature Directions.
Definition: types.hpp:133
static const zone_t INSIDE
Permit Zone.
Definition: nat_binding.hpp:51
const key_t key() const
Return the binding&#39;s key.
Definition: nat_binding.cpp:71
#define v
Definition: acl.c:341
A Database to store the unique &#39;singular&#39; instances of a single object type.
Definition: singular_db.hpp:32
zone_t(int v, const std::string s)
Constructor.
Definition: nat_binding.cpp:28
bool operator==(const enum_base &e) const
Comparison operator.
Definition: enum_base.hpp:41
static void dump(std::ostream &os)
Dump all nat_bindings into the stream provided.
A representation of an interface in VPP.
Definition: interface.hpp:41
Class definition for listeners to OM events.
Definition: om.hpp:284
inspect command handler Handler
Definition: inspect.hpp:54
std::shared_ptr< nat_binding > singular() const
Return the &#39;singular instance&#39; of the L2 config that matches this object.
dependency_t
There needs to be a strict order in which object types are read from VPP (at boot time) and replayed ...
Definition: types.hpp:43
The interface to writing objects into VPP OM.
Definition: om.hpp:140
A base class for all object_base in the VPP object_base-Model.
Definition: object_base.hpp:29
std::ostream & operator<<(std::ostream &os, const std::pair< direction_t, interface::key_t > &key)
The VPP Object Model (VOM) library.
Definition: acl_binding.cpp:19
static std::shared_ptr< nat_binding > find(const key_t &key)
Static function to find the bridge_domain in the model.
unsigned char u8
Definition: types.h:56
void show(char *chroot_path, int verbose)
Definition: svmtool.c:105
const std::string & to_string() const
convert to string format for debug purposes
Definition: enum_base.hpp:36
std::tuple< interface::key_t, direction_t, l3_proto_t > key_t
The key for a NAT Binding.
Definition: nat_binding.hpp:66
static const zone_t & from_vpp(u8 is_inside)
Definition: nat_binding.cpp:33