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a9b7b2ad AL |
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 | ||
9c058332 | 13 | #include "qemu/osdep.h" |
dccfcd0e | 14 | #include "sysemu/rng.h" |
7b1b5d19 | 15 | #include "qapi/qmp/qerror.h" |
269e09f3 | 16 | #include "qom/object_interfaces.h" |
a9b7b2ad AL |
17 | |
18 | void rng_backend_request_entropy(RngBackend *s, size_t size, | |
19 | EntropyReceiveFunc *receive_entropy, | |
20 | void *opaque) | |
21 | { | |
22 | RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); | |
60253ed1 | 23 | RngRequest *req; |
a9b7b2ad AL |
24 | |
25 | if (k->request_entropy) { | |
60253ed1 LP |
26 | req = g_malloc(sizeof(*req)); |
27 | ||
28 | req->offset = 0; | |
29 | req->size = size; | |
30 | req->receive_entropy = receive_entropy; | |
31 | req->opaque = opaque; | |
32 | req->data = g_malloc(req->size); | |
33 | ||
34 | k->request_entropy(s, req); | |
35 | ||
443590c2 | 36 | QSIMPLEQ_INSERT_TAIL(&s->requests, req, next); |
a9b7b2ad AL |
37 | } |
38 | } | |
39 | ||
a9b7b2ad AL |
40 | static bool rng_backend_prop_get_opened(Object *obj, Error **errp) |
41 | { | |
42 | RngBackend *s = RNG_BACKEND(obj); | |
43 | ||
44 | return s->opened; | |
45 | } | |
46 | ||
57d3e1b3 | 47 | static void rng_backend_complete(UserCreatable *uc, Error **errp) |
a9b7b2ad | 48 | { |
57d3e1b3 | 49 | object_property_set_bool(OBJECT(uc), true, "opened", errp); |
a9b7b2ad AL |
50 | } |
51 | ||
52 | static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp) | |
53 | { | |
54 | RngBackend *s = RNG_BACKEND(obj); | |
55 | RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); | |
65cd9064 | 56 | Error *local_err = NULL; |
a9b7b2ad AL |
57 | |
58 | if (value == s->opened) { | |
59 | return; | |
60 | } | |
61 | ||
62 | if (!value && s->opened) { | |
c6bd8c70 | 63 | error_setg(errp, QERR_PERMISSION_DENIED); |
a9b7b2ad AL |
64 | return; |
65 | } | |
66 | ||
67 | if (k->opened) { | |
65cd9064 MA |
68 | k->opened(s, &local_err); |
69 | if (local_err) { | |
70 | error_propagate(errp, local_err); | |
71 | return; | |
72 | } | |
a9b7b2ad AL |
73 | } |
74 | ||
65cd9064 | 75 | s->opened = true; |
a9b7b2ad AL |
76 | } |
77 | ||
9f14b0ad LP |
78 | static void rng_backend_free_request(RngRequest *req) |
79 | { | |
80 | g_free(req->data); | |
81 | g_free(req); | |
82 | } | |
83 | ||
84 | static void rng_backend_free_requests(RngBackend *s) | |
85 | { | |
443590c2 | 86 | RngRequest *req, *next; |
9f14b0ad | 87 | |
443590c2 LP |
88 | QSIMPLEQ_FOREACH_SAFE(req, &s->requests, next, next) { |
89 | rng_backend_free_request(req); | |
9f14b0ad LP |
90 | } |
91 | ||
443590c2 | 92 | QSIMPLEQ_INIT(&s->requests); |
9f14b0ad LP |
93 | } |
94 | ||
95 | void rng_backend_finalize_request(RngBackend *s, RngRequest *req) | |
96 | { | |
443590c2 | 97 | QSIMPLEQ_REMOVE(&s->requests, req, RngRequest, next); |
9f14b0ad LP |
98 | rng_backend_free_request(req); |
99 | } | |
100 | ||
a9b7b2ad AL |
101 | static void rng_backend_init(Object *obj) |
102 | { | |
443590c2 LP |
103 | RngBackend *s = RNG_BACKEND(obj); |
104 | ||
105 | QSIMPLEQ_INIT(&s->requests); | |
106 | ||
a9b7b2ad AL |
107 | object_property_add_bool(obj, "opened", |
108 | rng_backend_prop_get_opened, | |
109 | rng_backend_prop_set_opened, | |
110 | NULL); | |
111 | } | |
112 | ||
9f14b0ad LP |
113 | static void rng_backend_finalize(Object *obj) |
114 | { | |
115 | RngBackend *s = RNG_BACKEND(obj); | |
116 | ||
117 | rng_backend_free_requests(s); | |
118 | } | |
119 | ||
57d3e1b3 IM |
120 | static void rng_backend_class_init(ObjectClass *oc, void *data) |
121 | { | |
122 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); | |
123 | ||
124 | ucc->complete = rng_backend_complete; | |
125 | } | |
126 | ||
8c43a6f0 | 127 | static const TypeInfo rng_backend_info = { |
a9b7b2ad AL |
128 | .name = TYPE_RNG_BACKEND, |
129 | .parent = TYPE_OBJECT, | |
130 | .instance_size = sizeof(RngBackend), | |
131 | .instance_init = rng_backend_init, | |
9f14b0ad | 132 | .instance_finalize = rng_backend_finalize, |
a9b7b2ad | 133 | .class_size = sizeof(RngBackendClass), |
57d3e1b3 | 134 | .class_init = rng_backend_class_init, |
a9b7b2ad | 135 | .abstract = true, |
269e09f3 IM |
136 | .interfaces = (InterfaceInfo[]) { |
137 | { TYPE_USER_CREATABLE }, | |
138 | { } | |
139 | } | |
a9b7b2ad AL |
140 | }; |
141 | ||
142 | static void register_types(void) | |
143 | { | |
144 | type_register_static(&rng_backend_info); | |
145 | } | |
146 | ||
147 | type_init(register_types); |