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
|
/****************************************************************************
* net/net-close.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <net/uip/uip-arch.h>
#include "net-internal.h"
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_NET_TCP
struct tcp_close_s
{
FAR struct socket *cl_psock; /* Reference to the TCP socket */
sem_t cl_sem; /* Semaphore signals disconnect completion */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: netclose_disconnect
*
* Description:
* Break any current TCP connection
*
* Parameters:
* conn - uIP TCP connection structure
*
* Returned Value:
* None
*
* Assumptions:
* Called from normal user-level logic
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static uint8 netclose_interrupt(struct uip_driver_s *dev,
struct uip_conn *conn, uint8 flags)
{
struct tcp_close_s *pstate = (struct tcp_close_s *)conn->data_private;
nvdbg("flags: %02x\n", flags);
if (pstate)
{
/* UIP_CLOSE: The remote host has closed the connection
* UIP_ABORT: The remote host has aborted the connection
*/
if ((flags & (UIP_CLOSE|UIP_ABORT)) != 0)
{
/* The disconnection is complete */
conn->data_flags = 0;
conn->data_private = NULL;
conn->data_event = NULL;
sem_post(&pstate->cl_sem);
nvdbg("Resuming\n");
}
else
{
/* Drop data received in this state and make sure that UIP_CLOSE
* is set in the response
*/
dev->d_len = 0;
return (flags & ~UIP_NEWDATA) | UIP_CLOSE;
}
}
return flags;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: netclose_disconnect
*
* Description:
* Break any current TCP connection
*
* Parameters:
* conn - uIP TCP connection structure
*
* Returned Value:
* None
*
* Assumptions:
* Called from normal user-level logic
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static inline void netclose_disconnect(FAR struct socket *psock)
{
struct tcp_close_s state;
struct uip_conn *conn;
irqstate_t flags;
/* Interrupts are disabled here to avoid race conditions */
flags = irqsave();
/* Is the TCP socket in a connected state? */
if (_SS_ISCONNECTED(psock->s_flags))
{
/* Set up to receive TCP data events */
state.cl_psock = psock;
sem_init(&state.cl_sem, 0, 0);
conn = psock->s_conn;
conn->data_flags = UIP_NEWDATA|UIP_CLOSE|UIP_ABORT;
conn->data_private = (void*)&state;
conn->data_event = netclose_interrupt;
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(&conn->ripaddr);
/* Wait for the disconnect event */
(void)sem_wait(&state.cl_sem);
/* We are now disconnected */
sem_destroy(&state.cl_sem);
conn->data_flags = 0;
conn->data_private = NULL;
conn->data_event = NULL;
}
irqrestore(flags);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: net_close
*
* Description:
* Performs the close operation on socket descriptors
*
* Parameters:
* sockfd Socket descriptor of socket
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
int net_close(int sockfd)
{
FAR struct socket *psock = sockfd_socket(sockfd);
int err;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* Perform uIP side of the close depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
struct uip_conn *conn = psock->s_conn;
uip_unlisten(conn); /* No longer accepting connections */
netclose_disconnect(psock); /* Break any current connections */
uip_tcpfree(conn); /* Free uIP resources */
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
uip_udpfree(psock->s_conn); /* Free uIP resources */
break;
#endif
default:
err = EBADF;
goto errout;
}
/* Then release the socket structure containing the connection */
sockfd_release(sockfd);
return OK;
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
|
