1 /*
2  * QEMU Cryptodev backend for QEMU cipher APIs
3  *
4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
5  *
6  * Authors:
7  *    Gonglei <arei.gonglei@huawei.com>
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
21  *
22  */
23 
24 #include "qemu/osdep.h"
25 #include "qapi/error.h"
26 #include "qapi/qmp/qerror.h"
27 #include "qemu/error-report.h"
28 #include "hw/virtio/vhost-user.h"
29 #include "standard-headers/linux/virtio_crypto.h"
30 #include "sysemu/cryptodev-vhost.h"
31 #include "chardev/char-fe.h"
32 #include "sysemu/cryptodev-vhost-user.h"
33 
34 
35 /**
36  * @TYPE_CRYPTODEV_BACKEND_VHOST_USER:
37  * name of backend that uses vhost user server
38  */
39 #define TYPE_CRYPTODEV_BACKEND_VHOST_USER "cryptodev-vhost-user"
40 
41 #define CRYPTODEV_BACKEND_VHOST_USER(obj) \
42     OBJECT_CHECK(CryptoDevBackendVhostUser, \
43                  (obj), TYPE_CRYPTODEV_BACKEND_VHOST_USER)
44 
45 
46 typedef struct CryptoDevBackendVhostUser {
47     CryptoDevBackend parent_obj;
48 
49     VhostUserState vhost_user;
50     CharBackend chr;
51     char *chr_name;
52     bool opened;
53     CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
54 } CryptoDevBackendVhostUser;
55 
56 static int
57 cryptodev_vhost_user_running(
58              CryptoDevBackendVhost *crypto)
59 {
60     return crypto ? 1 : 0;
61 }
62 
63 CryptoDevBackendVhost *
64 cryptodev_vhost_user_get_vhost(
65                          CryptoDevBackendClient *cc,
66                          CryptoDevBackend *b,
67                          uint16_t queue)
68 {
69     CryptoDevBackendVhostUser *s =
70                       CRYPTODEV_BACKEND_VHOST_USER(b);
71     assert(cc->type == CRYPTODEV_BACKEND_TYPE_VHOST_USER);
72     assert(queue < MAX_CRYPTO_QUEUE_NUM);
73 
74     return s->vhost_crypto[queue];
75 }
76 
77 static void cryptodev_vhost_user_stop(int queues,
78                           CryptoDevBackendVhostUser *s)
79 {
80     size_t i;
81 
82     for (i = 0; i < queues; i++) {
83         if (!cryptodev_vhost_user_running(s->vhost_crypto[i])) {
84             continue;
85         }
86 
87         cryptodev_vhost_cleanup(s->vhost_crypto[i]);
88         s->vhost_crypto[i] = NULL;
89     }
90 }
91 
92 static int
93 cryptodev_vhost_user_start(int queues,
94                          CryptoDevBackendVhostUser *s)
95 {
96     CryptoDevBackendVhostOptions options;
97     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
98     int max_queues;
99     size_t i;
100 
101     for (i = 0; i < queues; i++) {
102         if (cryptodev_vhost_user_running(s->vhost_crypto[i])) {
103             continue;
104         }
105 
106         options.opaque = &s->vhost_user;
107         options.backend_type = VHOST_BACKEND_TYPE_USER;
108         options.cc = b->conf.peers.ccs[i];
109         s->vhost_crypto[i] = cryptodev_vhost_init(&options);
110         if (!s->vhost_crypto[i]) {
111             error_report("failed to init vhost_crypto for queue %zu", i);
112             goto err;
113         }
114 
115         if (i == 0) {
116             max_queues =
117               cryptodev_vhost_get_max_queues(s->vhost_crypto[i]);
118             if (queues > max_queues) {
119                 error_report("you are asking more queues than supported: %d",
120                              max_queues);
121                 goto err;
122             }
123         }
124     }
125 
126     return 0;
127 
128 err:
129     cryptodev_vhost_user_stop(i + 1, s);
130     return -1;
131 }
132 
133 static Chardev *
134 cryptodev_vhost_claim_chardev(CryptoDevBackendVhostUser *s,
135                                     Error **errp)
136 {
137     Chardev *chr;
138 
139     if (s->chr_name == NULL) {
140         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
141                    "chardev", "a valid character device");
142         return NULL;
143     }
144 
145     chr = qemu_chr_find(s->chr_name);
146     if (chr == NULL) {
147         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
148                   "Device '%s' not found", s->chr_name);
149         return NULL;
150     }
151 
152     return chr;
153 }
154 
155 static void cryptodev_vhost_user_event(void *opaque, int event)
156 {
157     CryptoDevBackendVhostUser *s = opaque;
158     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
159     int queues = b->conf.peers.queues;
160 
161     assert(queues < MAX_CRYPTO_QUEUE_NUM);
162 
163     switch (event) {
164     case CHR_EVENT_OPENED:
165         if (cryptodev_vhost_user_start(queues, s) < 0) {
166             exit(1);
167         }
168         b->ready = true;
169         break;
170     case CHR_EVENT_CLOSED:
171         b->ready = false;
172         cryptodev_vhost_user_stop(queues, s);
173         break;
174     }
175 }
176 
177 static void cryptodev_vhost_user_init(
178              CryptoDevBackend *backend, Error **errp)
179 {
180     int queues = backend->conf.peers.queues;
181     size_t i;
182     Error *local_err = NULL;
183     Chardev *chr;
184     CryptoDevBackendClient *cc;
185     CryptoDevBackendVhostUser *s =
186                       CRYPTODEV_BACKEND_VHOST_USER(backend);
187 
188     chr = cryptodev_vhost_claim_chardev(s, &local_err);
189     if (local_err) {
190         error_propagate(errp, local_err);
191         return;
192     }
193 
194     s->opened = true;
195 
196     for (i = 0; i < queues; i++) {
197         cc = cryptodev_backend_new_client(
198                   "cryptodev-vhost-user", NULL);
199         cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
200                                        i, chr->label);
201         cc->queue_index = i;
202         cc->type = CRYPTODEV_BACKEND_TYPE_VHOST_USER;
203 
204         backend->conf.peers.ccs[i] = cc;
205 
206         if (i == 0) {
207             if (!qemu_chr_fe_init(&s->chr, chr, &local_err)) {
208                 error_propagate(errp, local_err);
209                 return;
210             }
211         }
212     }
213 
214     if (!vhost_user_init(&s->vhost_user, &s->chr, errp)) {
215         return;
216     }
217 
218     qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
219                      cryptodev_vhost_user_event, NULL, s, NULL, true);
220 
221     backend->conf.crypto_services =
222                          1u << VIRTIO_CRYPTO_SERVICE_CIPHER |
223                          1u << VIRTIO_CRYPTO_SERVICE_HASH |
224                          1u << VIRTIO_CRYPTO_SERVICE_MAC;
225     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
226     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
227 
228     backend->conf.max_size = UINT64_MAX;
229     backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
230     backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
231 }
232 
233 static int64_t cryptodev_vhost_user_sym_create_session(
234            CryptoDevBackend *backend,
235            CryptoDevBackendSymSessionInfo *sess_info,
236            uint32_t queue_index, Error **errp)
237 {
238     CryptoDevBackendClient *cc =
239                    backend->conf.peers.ccs[queue_index];
240     CryptoDevBackendVhost *vhost_crypto;
241     uint64_t session_id = 0;
242     int ret;
243 
244     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
245     if (vhost_crypto) {
246         struct vhost_dev *dev = &(vhost_crypto->dev);
247         ret = dev->vhost_ops->vhost_crypto_create_session(dev,
248                                                           sess_info,
249                                                           &session_id);
250         if (ret < 0) {
251             return -1;
252         } else {
253             return session_id;
254         }
255     }
256     return -1;
257 }
258 
259 static int cryptodev_vhost_user_sym_close_session(
260            CryptoDevBackend *backend,
261            uint64_t session_id,
262            uint32_t queue_index, Error **errp)
263 {
264     CryptoDevBackendClient *cc =
265                   backend->conf.peers.ccs[queue_index];
266     CryptoDevBackendVhost *vhost_crypto;
267     int ret;
268 
269     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
270     if (vhost_crypto) {
271         struct vhost_dev *dev = &(vhost_crypto->dev);
272         ret = dev->vhost_ops->vhost_crypto_close_session(dev,
273                                                          session_id);
274         if (ret < 0) {
275             return -1;
276         } else {
277             return 0;
278         }
279     }
280     return -1;
281 }
282 
283 static void cryptodev_vhost_user_cleanup(
284              CryptoDevBackend *backend,
285              Error **errp)
286 {
287     CryptoDevBackendVhostUser *s =
288                       CRYPTODEV_BACKEND_VHOST_USER(backend);
289     size_t i;
290     int queues = backend->conf.peers.queues;
291     CryptoDevBackendClient *cc;
292 
293     cryptodev_vhost_user_stop(queues, s);
294 
295     for (i = 0; i < queues; i++) {
296         cc = backend->conf.peers.ccs[i];
297         if (cc) {
298             cryptodev_backend_free_client(cc);
299             backend->conf.peers.ccs[i] = NULL;
300         }
301     }
302 
303     vhost_user_cleanup(&s->vhost_user);
304 }
305 
306 static void cryptodev_vhost_user_set_chardev(Object *obj,
307                                     const char *value, Error **errp)
308 {
309     CryptoDevBackendVhostUser *s =
310                       CRYPTODEV_BACKEND_VHOST_USER(obj);
311 
312     if (s->opened) {
313         error_setg(errp, QERR_PERMISSION_DENIED);
314     } else {
315         g_free(s->chr_name);
316         s->chr_name = g_strdup(value);
317     }
318 }
319 
320 static char *
321 cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
322 {
323     CryptoDevBackendVhostUser *s =
324                       CRYPTODEV_BACKEND_VHOST_USER(obj);
325     Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
326 
327     if (chr && chr->label) {
328         return g_strdup(chr->label);
329     }
330 
331     return NULL;
332 }
333 
334 static void cryptodev_vhost_user_instance_int(Object *obj)
335 {
336     object_property_add_str(obj, "chardev",
337                             cryptodev_vhost_user_get_chardev,
338                             cryptodev_vhost_user_set_chardev,
339                             NULL);
340 }
341 
342 static void cryptodev_vhost_user_finalize(Object *obj)
343 {
344     CryptoDevBackendVhostUser *s =
345                       CRYPTODEV_BACKEND_VHOST_USER(obj);
346 
347     qemu_chr_fe_deinit(&s->chr, false);
348 
349     g_free(s->chr_name);
350 }
351 
352 static void
353 cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
354 {
355     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
356 
357     bc->init = cryptodev_vhost_user_init;
358     bc->cleanup = cryptodev_vhost_user_cleanup;
359     bc->create_session = cryptodev_vhost_user_sym_create_session;
360     bc->close_session = cryptodev_vhost_user_sym_close_session;
361     bc->do_sym_op = NULL;
362 }
363 
364 static const TypeInfo cryptodev_vhost_user_info = {
365     .name = TYPE_CRYPTODEV_BACKEND_VHOST_USER,
366     .parent = TYPE_CRYPTODEV_BACKEND,
367     .class_init = cryptodev_vhost_user_class_init,
368     .instance_init = cryptodev_vhost_user_instance_int,
369     .instance_finalize = cryptodev_vhost_user_finalize,
370     .instance_size = sizeof(CryptoDevBackendVhostUser),
371 };
372 
373 static void
374 cryptodev_vhost_user_register_types(void)
375 {
376     type_register_static(&cryptodev_vhost_user_info);
377 }
378 
379 type_init(cryptodev_vhost_user_register_types);
380