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
|
/****************************************************************************
* net/net_router.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include "net_internal.h"
#include "net_route.h"
#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
/****************************************************************************
* Public Types
****************************************************************************/
struct route_match_s
{
uip_ipaddr_t target; /* The target IP address on an external network to match */
uip_ipaddr_t router; /* The IP address of the router on one of our networks*/
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: net_match
*
* Description:
* Return 1 if the route is available
*
* Parameters:
* route - The next route to examine
* arg - The match values (cast to void*)
*
* Returned Value:
* 0 if the entry is not a match; 1 if the entry matched and was cleared.
*
****************************************************************************/
static int net_match(FAR struct net_route_s *route, FAR void *arg)
{
FAR struct route_match_s *match = ( FAR struct route_match_s *)arg;
/* To match, the masked target addresses must be the same. In the event
* of multiple matches, only the first is returned. There not (yet) any
* concept for the precedence of networks.
*/
if (uip_ipaddr_maskcmp(route->target, match->target, route->netmask))
{
/* They match.. Copy the router address */
uip_ipaddr_copy(match->router, route->router);
return 1;
}
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: net_router
*
* Description:
* Given an IP address on a external network, return the address of the
* router on a local network that can forward to the external network.
*
* Parameters:
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int net_router(uip_ipaddr_t target, uip_ipaddr_t *router)
#else
int net_router(uip_ipaddr_t target, uip_ipaddr_t router)
#endif
{
struct route_match_s match;
int ret;
/* Set up the comparison structure */
memset(&match, 0, sizeof(struct route_match_s));
uip_ipaddr_copy(match.target, target);
/* Then remove the entry from the routing table */
ret = net_foreachroute(net_match, &match) ? OK : -ENOENT;
#ifdef CONFIG_NET_IPv6
uip_ipaddr_copy(*router, match.target);
#else
uip_ipaddr_copy(router, match.target);
#endif
return ret;
}
#endif /* CONFIG_NET && CONFIG_NET_ROUTE */
|