1 /*
2 * QEMU Random Number Generator Backend
3 *
4 * Copyright IBM, Corp. 2012
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include "sysemu/rng.h"
15 #include "qapi/error.h"
16 #include "qemu/module.h"
17 #include "qom/object_interfaces.h"
18
rng_backend_request_entropy(RngBackend * s,size_t size,EntropyReceiveFunc * receive_entropy,void * opaque)19 void rng_backend_request_entropy(RngBackend *s, size_t size,
20 EntropyReceiveFunc *receive_entropy,
21 void *opaque)
22 {
23 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
24 RngRequest *req;
25
26 if (k->request_entropy) {
27 req = g_malloc(sizeof(*req));
28
29 req->offset = 0;
30 req->size = size;
31 req->receive_entropy = receive_entropy;
32 req->opaque = opaque;
33 req->data = g_malloc(req->size);
34
35 k->request_entropy(s, req);
36
37 QSIMPLEQ_INSERT_TAIL(&s->requests, req, next);
38 }
39 }
40
rng_backend_prop_get_opened(Object * obj,Error ** errp)41 static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
42 {
43 RngBackend *s = RNG_BACKEND(obj);
44
45 return s->opened;
46 }
47
rng_backend_complete(UserCreatable * uc,Error ** errp)48 static void rng_backend_complete(UserCreatable *uc, Error **errp)
49 {
50 RngBackend *s = RNG_BACKEND(uc);
51 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
52 Error *local_err = NULL;
53
54 if (k->opened) {
55 k->opened(s, &local_err);
56 if (local_err) {
57 error_propagate(errp, local_err);
58 return;
59 }
60 }
61
62 s->opened = true;
63 }
64
rng_backend_free_request(RngRequest * req)65 static void rng_backend_free_request(RngRequest *req)
66 {
67 g_free(req->data);
68 g_free(req);
69 }
70
rng_backend_free_requests(RngBackend * s)71 static void rng_backend_free_requests(RngBackend *s)
72 {
73 RngRequest *req, *next;
74
75 QSIMPLEQ_FOREACH_SAFE(req, &s->requests, next, next) {
76 rng_backend_free_request(req);
77 }
78
79 QSIMPLEQ_INIT(&s->requests);
80 }
81
rng_backend_finalize_request(RngBackend * s,RngRequest * req)82 void rng_backend_finalize_request(RngBackend *s, RngRequest *req)
83 {
84 QSIMPLEQ_REMOVE(&s->requests, req, RngRequest, next);
85 rng_backend_free_request(req);
86 }
87
rng_backend_init(Object * obj)88 static void rng_backend_init(Object *obj)
89 {
90 RngBackend *s = RNG_BACKEND(obj);
91
92 QSIMPLEQ_INIT(&s->requests);
93 }
94
rng_backend_finalize(Object * obj)95 static void rng_backend_finalize(Object *obj)
96 {
97 RngBackend *s = RNG_BACKEND(obj);
98
99 rng_backend_free_requests(s);
100 }
101
rng_backend_class_init(ObjectClass * oc,void * data)102 static void rng_backend_class_init(ObjectClass *oc, void *data)
103 {
104 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
105
106 ucc->complete = rng_backend_complete;
107
108 object_class_property_add_bool(oc, "opened",
109 rng_backend_prop_get_opened,
110 NULL);
111 }
112
113 static const TypeInfo rng_backend_info = {
114 .name = TYPE_RNG_BACKEND,
115 .parent = TYPE_OBJECT,
116 .instance_size = sizeof(RngBackend),
117 .instance_init = rng_backend_init,
118 .instance_finalize = rng_backend_finalize,
119 .class_size = sizeof(RngBackendClass),
120 .class_init = rng_backend_class_init,
121 .abstract = true,
122 .interfaces = (InterfaceInfo[]) {
123 { TYPE_USER_CREATABLE },
124 { }
125 }
126 };
127
register_types(void)128 static void register_types(void)
129 {
130 type_register_static(&rng_backend_info);
131 }
132
133 type_init(register_types);
134