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
|
/*
* Copyright 2026 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "ssl_local.h"
#ifndef OPENSSL_NO_DTLS
/*
* Creates a new DTLS_RX structure. The demuxer is
* provided and owned by the DTLS listener.
*/
DTLS_RX *ossl_dtls_rx_new(DGRAM_DEMUX *demux)
{
DTLS_RX *rx = OPENSSL_malloc(sizeof(*rx));
if (rx == NULL)
return NULL;
rx->demux = demux;
ossl_list_urxe_init(&rx->urxe_pending);
rx->mutex = ossl_crypto_mutex_new();
#ifdef OPENSSL_THREADS
if (rx->mutex == NULL) {
OPENSSL_free(rx);
return NULL;
}
#endif
return rx;
}
/*
* Frees a DTLS_RX struct. The demuxer is not freed, as it is
* owned by the DTLS listener. The list is walked and freed.
*/
void ossl_dtls_rx_free(DTLS_RX *rx)
{
DGRAM_URXE *urxe, *urxe_next;
if (rx == NULL)
return;
for (urxe = ossl_list_urxe_head(&rx->urxe_pending); urxe != NULL;
urxe = urxe_next) {
urxe_next = ossl_list_urxe_next(urxe);
ossl_list_urxe_remove(&rx->urxe_pending, urxe);
ossl_dgram_demux_release_urxe(rx->demux, urxe);
}
/*
* The demuxer is not freed, as it is owned by the DTLS listener.
*/
rx->demux = NULL;
ossl_crypto_mutex_free(&rx->mutex);
OPENSSL_free(rx);
}
/*
* Injects a received URXE into the DTLS_RX struct.
*
* On overflow the oldest queued datagram is evicted: a flight can span
* several datagrams, so keeping the newest biases the queue toward the
* flight the peer just sent. The evicted URXE is released only after
* rx->mutex is dropped, as release takes demux->mutex, which must not
* nest under rx->mutex.
*/
void ossl_dtls_rx_inject_urxe(DTLS_RX *rx, DGRAM_URXE *e)
{
DGRAM_URXE *oldest = NULL;
ossl_crypto_mutex_lock(rx->mutex);
if (ossl_list_urxe_num(&rx->urxe_pending) >= OSSL_DTLS_RX_DEFAULT_MAX_QUEUED)
oldest = ossl_list_urxe_head(&rx->urxe_pending);
if (oldest != NULL)
ossl_list_urxe_remove(&rx->urxe_pending, oldest);
ossl_list_urxe_insert_tail(&rx->urxe_pending, e);
ossl_crypto_mutex_unlock(rx->mutex);
if (oldest != NULL)
ossl_dtls_rx_release_urxe(rx, oldest);
}
/*
* Release the URXE from the DTLS_RX struct.
*/
void ossl_dtls_rx_release_urxe(DTLS_RX *rx, DGRAM_URXE *e)
{
ossl_dgram_demux_release_urxe(rx->demux, e);
}
/*
* Reads a datagram from the DTLS_RX struct.
*/
DGRAM_URXE *ossl_dtls_read_datagram(DTLS_RX *rx)
{
DGRAM_URXE *e;
ossl_crypto_mutex_lock(rx->mutex);
if (ossl_list_urxe_is_empty(&rx->urxe_pending)) {
ossl_crypto_mutex_unlock(rx->mutex);
return NULL;
}
e = ossl_list_urxe_head(&rx->urxe_pending);
ossl_list_urxe_remove(&rx->urxe_pending, e);
e->demux_state = URXE_DEMUX_STATE_ISSUED;
ossl_crypto_mutex_unlock(rx->mutex);
return e;
}
#endif /* OPENSSL_NO_DTLS */
|
