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Vector Packet Processing
dhcp_client.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_DHCP_CLIENT_H__
17 #define __VOM_DHCP_CLIENT_H__
18 
19 #include "vom/hw.hpp"
20 #include "vom/inspect.hpp"
21 #include "vom/interface.hpp"
22 #include "vom/object_base.hpp"
23 #include "vom/om.hpp"
24 #include "vom/prefix.hpp"
25 #include "vom/singular_db.hpp"
26 
27 namespace VOM {
28 namespace dhcp_client_cmds {
29 class events_cmd;
30 };
31 /**
32  * A representation of DHCP client on an interface
33  */
34 class dhcp_client : public object_base
35 {
36 public:
37  /**
38  * typedef for the DHCP client key type
39  */
41 
42  struct state_t : enum_base<state_t>
43  {
44  const static state_t DISCOVER;
45  const static state_t REQUEST;
46  const static state_t BOUND;
47 
48  static const state_t& from_vpp(int i);
49 
50  private:
51  /**
52  * Private constructor taking the value and the string name
53  */
54  state_t(int v, const std::string& s);
55  };
56 
57  /**
58  * A DHCP lease data
59  */
60  struct lease_t
61  {
62  lease_t();
63  lease_t(const state_t& state,
64  std::shared_ptr<interface> itf,
65  const boost::asio::ip::address& router_address,
66  const route::prefix_t& host_prefix,
67  const std::string& hostname,
68  const mac_address_t& mac);
69 
70  std::string to_string() const;
71 
72  const state_t& state;
73  std::shared_ptr<interface> itf;
76  std::string hostname;
78  };
79 
80  /**
81  * A class that listens to DHCP Events
82  */
84  {
85  public:
86  /**
87  * Constructor
88  */
90 
91  /**
92  * listener's virtual function invoked when a DHCP event is
93  * available to read
94  */
95  virtual void handle_dhcp_event(std::shared_ptr<lease_t> e) = 0;
96 
97  /**
98  * Return the HW::item associated with this command
99  */
100  HW::item<bool>& status();
101 
102  protected:
103  /**
104  * The HW::item associated with this command
105  */
107  };
108 
109  /**
110  * Construct a new object matching the desried state
111  */
112  dhcp_client(const interface& itf,
113  const std::string& hostname,
114  bool set_broadcast_flag = true,
115  event_listener* ev = nullptr);
116 
117  /**
118  * Construct a new object matching the desried state
119  */
120  dhcp_client(const interface& itf,
121  const std::string& hostname,
122  const l2_address_t& client_id,
123  bool set_broadcast_flag = true,
124  event_listener* ev = nullptr);
125 
126  /**
127  * Copy Constructor
128  */
129  dhcp_client(const dhcp_client& o);
130 
131  /**
132  * Destructor
133  */
134  ~dhcp_client();
135 
136  /**
137  * Comparison operator - for UT
138  */
139  bool operator==(const dhcp_client& d) const;
140 
141  /**
142  * Return the object's key
143  */
144  const key_t& key() const;
145 
146  /**
147  * Return the 'singular' of the DHCP client that matches this object
148  */
149  std::shared_ptr<dhcp_client> singular() const;
150 
151  /**
152  * convert to string format for debug purposes
153  */
154  std::string to_string() const;
155 
156  /**
157  * Dump all DHCP clients into the stream provided
158  */
159  static void dump(std::ostream& os);
160 
161  /**
162  * Find a DHCP client from its key
163  */
164  static std::shared_ptr<dhcp_client> find(const key_t& k);
165 
166  /**
167  * return the current lease data
168  */
169  const std::shared_ptr<lease_t> lease() const;
170 
171 private:
172  /**
173  * Class definition for listeners to OM events
174  */
176  {
177  public:
178  event_handler();
179  virtual ~event_handler() = default;
180 
181  /**
182  * Handle a populate event
183  */
184  void handle_populate(const client_db::key_t& key);
185 
186  /**
187  * Handle a replay event
188  */
189  void handle_replay();
190 
191  /**
192  * Show the object in the Singular DB
193  */
194  void show(std::ostream& os);
195 
196  /**
197  * Get the sortable Id of the listener
198  */
199  dependency_t order() const;
200  };
201 
202  /**
203  * event_handler to register with OM
204  */
205  static event_handler m_evh;
206 
207  /**
208  * Enquue commonds to the VPP command Q for the update
209  */
210  void update(const dhcp_client& obj);
211 
212  /**
213  * Find or add DHCP client to the OM
214  */
215  static std::shared_ptr<dhcp_client> find_or_add(const dhcp_client& temp);
216 
217  /*
218  * It's the OM class that calls singular()
219  */
220  friend class OM;
221 
222  /**
223  * It's the singular_db class that calls replay()
224  */
225  friend class singular_db<key_t, dhcp_client>;
226 
227  /**
228  * Sweep/reap the object if still stale
229  */
230  void sweep(void);
231 
232  /**
233  * replay the object to create it in hardware
234  */
235  void replay(void);
236 
237  void lease(std::shared_ptr<lease_t> l);
238 
239  /**
240  * A reference counting pointer to the interface on which DHCP client
241  * resides. By holding the reference here, we can guarantee that
242  * this object will outlive the interface
243  */
244  const std::shared_ptr<interface> m_itf;
245 
246  /**
247  * The hostname in the DHCP client
248  */
249  const std::string m_hostname;
250 
251  /**
252  * The option-61 client_id in the DHCP client
253  */
254  const l2_address_t m_client_id;
255 
256  /**
257  * Flag to control the setting the of DHCP discover's broadcast flag
258  */
259  const bool m_set_broadcast_flag;
260 
261  /**
262  * HW configuration for the binding. The bool representing the
263  * do/don't bind.
264  */
265  HW::item<bool> m_binding;
266 
267  /**
268  * A pointer to an event listener for client events
269  */
270  event_listener* m_evl;
271 
272  /**
273  * Current lease state for this client
274  */
275  std::shared_ptr<lease_t> m_lease;
276 
277  std::shared_ptr<dhcp_client_cmds::events_cmd> m_event_cmd;
278 
279  void handle_dhcp_event(std::shared_ptr<lease_t> e);
280 
281  /**
282  * A map of all Dhcp clients keyed against the interface.
283  */
285 
286  static std::weak_ptr<dhcp_client_cmds::events_cmd> m_s_event_cmd;
287  static std::shared_ptr<dhcp_client_cmds::events_cmd> get_event_cmd();
288 
289  class dhcp_client_listener : public event_listener
290  {
291  public:
292  /**
293  * listener's virtual function invoked when a DHCP event is
294  * available to read
295  */
296  void handle_dhcp_event(std::shared_ptr<lease_t> e);
297  };
298  static dhcp_client_listener m_listener;
299 };
300 };
301 
302 /*
303  * fd.io coding-style-patch-verification: ON
304  *
305  * Local Variables:
306  * eval: (c-set-style "mozilla")
307  * End:
308  */
309 
310 #endif
typedef address
Definition: ip_types.api:30
HW::item< bool > m_status
The HW::item associated with this command.
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
route::path from_vpp(const vapi_type_fib_path &p, const nh_proto_t &nhp)
static const state_t REQUEST
Definition: dhcp_client.hpp:45
A functor class represents our desire to recieve interface events.
int i
A representation of DHCP client on an interface.
Definition: dhcp_client.hpp:34
A class that listens to DHCP Events.
Definition: dhcp_client.hpp:83
Type def of a L2 address as read from VPP.
Definition: types.hpp:339
vhost_vring_state_t state
Definition: vhost_user.h:120
route::prefix_t host_prefix
Definition: dhcp_client.hpp:75
static const state_t BOUND
Definition: dhcp_client.hpp:46
static const state_t DISCOVER
Definition: dhcp_client.hpp:44
A Database to store the unique &#39;singular&#39; instances of a single object type.
Definition: singular_db.hpp:33
boost::asio::ip::address router_address
Definition: dhcp_client.hpp:74
interface::key_t key_t
typedef for the DHCP client key type
Definition: dhcp_client.hpp:40
A representation of an interface in VPP.
Definition: interface.hpp:41
std::shared_ptr< interface > itf
Definition: dhcp_client.hpp:73
Class definition for listeners to OM events.
Definition: om.hpp:284
inspect command handler Handler
Definition: inspect.hpp:54
void event_handler(void *tls_async)
Definition: tls_async.c:340
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
The VPP Object Model (VOM) library.
Definition: acl_binding.cpp:19
void show(char *chroot_path, int verbose)
Definition: svmtool.c:105
A DHCP lease data.
Definition: dhcp_client.hpp:60
Type def of a Ethernet address.
Definition: types.hpp:295
std::string key_t
The key for interface&#39;s key.
Definition: interface.hpp:56
vl_api_mac_address_t mac
Definition: gbp.api:118
A prefix defintion.
Definition: prefix.hpp:92