aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/dhcp/dhcp_proxy.h
blob: f8fc2902684dfa93102c23a7a0a08e6386b8a345 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 * dhcp_proxy.h: DHCP v4 & v6 proxy common functions/types
 *
 * Copyright (c) 2013 Cisco and/or its affiliates.
 * Licensed 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef included_dhcp_proxy_h
#define included_dhcp_proxy_h

#include <vnet/vnet.h>
#include <vnet/dhcp/dhcp4_packet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/pg/pg.h>
#include <vnet/ip/format.h>
#include <vnet/udp/udp.h>

typedef enum
{
#define dhcp_proxy_error(n,s) DHCP_PROXY_ERROR_##n,
#include <vnet/dhcp/dhcp4_proxy_error.def>
#undef dhcp_proxy_error
  DHCP_PROXY_N_ERROR,
} dhcp_proxy_error_t;

typedef enum
{
#define dhcpv6_proxy_error(n,s) DHCPV6_PROXY_ERROR_##n,
#include <vnet/dhcp/dhcp6_proxy_error.def>
#undef dhcpv6_proxy_error
  DHCPV6_PROXY_N_ERROR,
} dhcpv6_proxy_error_t;


/**
 * @brief The Virtual Sub-net Selection information for a given RX FIB
 */
typedef struct dhcp_vss_t_
{
    /**
     * @brief VSS type as defined in RFC 6607:
     *	 0 for NVT ASCII VPN Identifier
     *   1 for RFC 2685 VPN-ID of 7 octects - 3 bytes OUI & 4 bytes VPN index
     *   255 for global default VPN
     */
  u8 vss_type;
#define VSS_TYPE_ASCII 0
#define VSS_TYPE_VPN_ID 1
#define VSS_TYPE_INVALID 123
#define VSS_TYPE_DEFAULT 255
    /**
     * @brief Type 1 VPN-ID
     */
  u8 vpn_id[7];
    /**
     * @brief Type 0 ASCII VPN Identifier
     */
  u8 *vpn_ascii_id;
} dhcp_vss_t;

/**
 * @brief A representation of a single DHCP Server within a given VRF config
 */
typedef struct dhcp_server_t_
{
    /**
     * @brief The address of the DHCP server to which to relay the client's
     *        messages
     */
  ip46_address_t dhcp_server;

    /**
     * @brief The FIB index (not the external Table-ID) in which the server
     *        is reachable.
     */
  u32 server_fib_index;
} dhcp_server_t;

/**
 * @brief A DHCP proxy represenation fpr per-client VRF config
 */
typedef struct dhcp_proxy_t_
{
    /**
     * @brief The set of DHCP servers to which messages are relayed.
     *  If multiple servers are configured then discover/solict messages
     * are relayed to each. A cookie is maintained for the relay, and only
     * one message is replayed to the client, based on the presence of the
     * cookie.
     * The expectation is there are only 1 or 2 servers, hence no fancy DB.
     */
  dhcp_server_t *dhcp_servers;

    /**
     * @brief Hash table of pending requets key'd on the clients MAC address
     */
  uword *dhcp_pending;

    /**
     * @brief A lock for the pending request DB.
     */
  int lock;

    /**
     * @brief The source address to use in relayed messaes
     */
  ip46_address_t dhcp_src_address;

    /**
     * @brief The FIB index (not the external Table-ID) in which the client
     *        is resides.
     */
  u32 rx_fib_index;
} dhcp_proxy_t;

#define DHCP_N_PROTOS (FIB_PROTOCOL_IP6 + 1)

/**
 * @brief Collection of global DHCP proxy data
 */
typedef struct
{
  /* Pool of DHCP servers */
  dhcp_proxy_t *dhcp_servers[DHCP_N_PROTOS];

  /* Pool of selected DHCP server. Zero is the default server */
  u32 *dhcp_server_index_by_rx_fib_index[DHCP_N_PROTOS];

  /* to drop pkts in server-to-client direction */
  u32 error_drop_node_index;

  dhcp_vss_t *vss[DHCP_N_PROTOS];

  /* hash lookup specific vrf_id -> option 82 vss suboption  */
  u32 *vss_index_by_rx_fib_index[DHCP_N_PROTOS];

  /* udp ports have been registered */
  int udp_ports_registered;

  /* convenience */
  vlib_main_t *vlib_main;

} dhcp_proxy_main_t;

extern dhcp_proxy_main_t dhcp_proxy_main;

/**
 * @brief Register the dhcp client and server ports, if not already done
 */
void dhcp_maybe_register_udp_ports (void);

/**
 * @brief Send the details of a proxy session to the API client during a dump
 */
void dhcp_send_details (fib_protocol_t proto,
			void *opaque, u32 context, dhcp_proxy_t * proxy);

/**
 * @brief Show (on CLI) a VSS config during a show walk
 */
int dhcp_vss_show_walk (dhcp_vss_t * vss, u32 rx_table_id, void *ctx);

/**
 * @brief Configure/set a new VSS info
 */
int dhcp_proxy_set_vss (fib_protocol_t proto,
			u32 tbl_id,
			u8 vss_type,
			u8 * vpn_ascii_id, u32 oui, u32 vpn_index, u8 is_del);

/**
 * @brief Dump the proxy configs to the API
 */
void dhcp_proxy_dump (fib_protocol_t proto, void *opaque, u32 context);

/**
 * @brief Add a new DHCP proxy server configuration.
 * @return 1 is the config is new,
 *         0 otherwise (implying a modify of an existing)
 */
int dhcp_proxy_server_add (fib_protocol_t proto,
			   ip46_address_t * addr,
			   ip46_address_t * src_address,
			   u32 rx_fib_iindex, u32 server_table_id);

/**
 * @brief Delete a DHCP proxy config
 * @return 1 if the proxy is deleted, 0 otherwise
 */
int dhcp_proxy_server_del (fib_protocol_t proto,
			   u32 rx_fib_index,
			   ip46_address_t * addr, u32 server_table_id);

u32 dhcp_proxy_rx_table_get_table_id (fib_protocol_t proto, u32 fib_index);

/**
 * @brief Callback function invoked for each DHCP proxy entry
 *  return 0 to break the walk, non-zero otherwise.
 */
typedef int (*dhcp_proxy_walk_fn_t) (dhcp_proxy_t * server, void *ctx);

/**
 * @brief Walk/Visit each DHCP proxy server
 */
void dhcp_proxy_walk (fib_protocol_t proto,
		      dhcp_proxy_walk_fn_t fn, void *ctx);

/**
 * @brief Callback function invoked for each DHCP VSS entry
 *  return 0 to break the walk, non-zero otherwise.
 */
typedef int (*dhcp_vss_walk_fn_t) (dhcp_vss_t * server,
				   u32 rx_table_id, void *ctx);

/**
 * @brief Walk/Visit each DHCP proxy VSS
 */
void dhcp_vss_walk (fib_protocol_t proto, dhcp_vss_walk_fn_t fn, void *ctx);

/**
 * @brief Lock a proxy object to prevent simultaneous access of its
 *  pending store
 */
void dhcp_proxy_lock (dhcp_proxy_t * server);

/**
 * @brief Lock a proxy object to prevent simultaneous access of its
 *  pending store
 */
void dhcp_proxy_unlock (dhcp_proxy_t * server);

/**
 * @brief Get the VSS data for the FIB index
 */
static inline dhcp_vss_t *
dhcp_get_vss_info (dhcp_proxy_main_t * dm,
		   u32 rx_fib_index, fib_protocol_t proto)
{
  dhcp_vss_t *v = NULL;

  if (vec_len (dm->vss_index_by_rx_fib_index[proto]) > rx_fib_index &&
      dm->vss_index_by_rx_fib_index[proto][rx_fib_index] != ~0)
    {
      v = pool_elt_at_index (dm->vss[proto],
			     dm->vss_index_by_rx_fib_index[proto]
			     [rx_fib_index]);
    }

  return (v);
}

/**
 * @brief Get the DHCP proxy server data for the FIB index
 */
static inline dhcp_proxy_t *
dhcp_get_proxy (dhcp_proxy_main_t * dm,
		u32 rx_fib_index, fib_protocol_t proto)
{
  dhcp_proxy_t *s = NULL;

  if (vec_len (dm->dhcp_server_index_by_rx_fib_index[proto]) > rx_fib_index &&
      dm->dhcp_server_index_by_rx_fib_index[proto][rx_fib_index] != ~0)
    {
      s = pool_elt_at_index (dm->dhcp_servers[proto],
			     dm->dhcp_server_index_by_rx_fib_index[proto]
			     [rx_fib_index]);
    }

  return (s);
}

int dhcp6_proxy_set_server (ip46_address_t * addr,
			    ip46_address_t * src_addr,
			    u32 rx_table_id, u32 server_table_id, int is_del);
int dhcp4_proxy_set_server (ip46_address_t * addr,
			    ip46_address_t * src_addr,
			    u32 rx_table_id, u32 server_table_id, int is_del);

#endif /* included_dhcp_proxy_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */