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 2.1 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 #include "qom/object.h"
34 
35 
36 /**
37  * @TYPE_CRYPTODEV_BACKEND_VHOST_USER:
38  * name of backend that uses vhost user server
39  */
40 #define TYPE_CRYPTODEV_BACKEND_VHOST_USER "cryptodev-vhost-user"
41 
42 OBJECT_DECLARE_SIMPLE_TYPE(CryptoDevBackendVhostUser, CRYPTODEV_BACKEND_VHOST_USER)
43 
44 
45 struct CryptoDevBackendVhostUser {
46     CryptoDevBackend parent_obj;
47 
48     VhostUserState vhost_user;
49     CharBackend chr;
50     char *chr_name;
51     bool opened;
52     CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
53 };
54 
55 static int
56 cryptodev_vhost_user_running(
57              CryptoDevBackendVhost *crypto)
58 {
59     return crypto ? 1 : 0;
60 }
61 
62 CryptoDevBackendVhost *
63 cryptodev_vhost_user_get_vhost(
64                          CryptoDevBackendClient *cc,
65                          CryptoDevBackend *b,
66                          uint16_t queue)
67 {
68     CryptoDevBackendVhostUser *s =
69                       CRYPTODEV_BACKEND_VHOST_USER(b);
70     assert(cc->type == QCRYPTODEV_BACKEND_TYPE_VHOST_USER);
71     assert(queue < MAX_CRYPTO_QUEUE_NUM);
72 
73     return s->vhost_crypto[queue];
74 }
75 
76 static void cryptodev_vhost_user_stop(int queues,
77                           CryptoDevBackendVhostUser *s)
78 {
79     size_t i;
80 
81     for (i = 0; i < queues; i++) {
82         if (!cryptodev_vhost_user_running(s->vhost_crypto[i])) {
83             continue;
84         }
85 
86         cryptodev_vhost_cleanup(s->vhost_crypto[i]);
87         s->vhost_crypto[i] = NULL;
88     }
89 }
90 
91 static int
92 cryptodev_vhost_user_start(int queues,
93                          CryptoDevBackendVhostUser *s)
94 {
95     CryptoDevBackendVhostOptions options;
96     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
97     int max_queues;
98     size_t i;
99 
100     for (i = 0; i < queues; i++) {
101         if (cryptodev_vhost_user_running(s->vhost_crypto[i])) {
102             continue;
103         }
104 
105         options.opaque = &s->vhost_user;
106         options.backend_type = VHOST_BACKEND_TYPE_USER;
107         options.cc = b->conf.peers.ccs[i];
108         s->vhost_crypto[i] = cryptodev_vhost_init(&options);
109         if (!s->vhost_crypto[i]) {
110             error_report("failed to init vhost_crypto for queue %zu", i);
111             goto err;
112         }
113 
114         if (i == 0) {
115             max_queues =
116               cryptodev_vhost_get_max_queues(s->vhost_crypto[i]);
117             if (queues > max_queues) {
118                 error_report("you are asking more queues than supported: %d",
119                              max_queues);
120                 goto err;
121             }
122         }
123     }
124 
125     return 0;
126 
127 err:
128     cryptodev_vhost_user_stop(i + 1, s);
129     return -1;
130 }
131 
132 static Chardev *
133 cryptodev_vhost_claim_chardev(CryptoDevBackendVhostUser *s,
134                                     Error **errp)
135 {
136     Chardev *chr;
137 
138     if (s->chr_name == NULL) {
139         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
140                    "chardev", "a valid character device");
141         return NULL;
142     }
143 
144     chr = qemu_chr_find(s->chr_name);
145     if (chr == NULL) {
146         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
147                   "Device '%s' not found", s->chr_name);
148         return NULL;
149     }
150 
151     return chr;
152 }
153 
154 static void cryptodev_vhost_user_event(void *opaque, QEMUChrEvent event)
155 {
156     CryptoDevBackendVhostUser *s = opaque;
157     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
158     int queues = b->conf.peers.queues;
159 
160     assert(queues < MAX_CRYPTO_QUEUE_NUM);
161 
162     switch (event) {
163     case CHR_EVENT_OPENED:
164         if (cryptodev_vhost_user_start(queues, s) < 0) {
165             exit(1);
166         }
167         b->ready = true;
168         break;
169     case CHR_EVENT_CLOSED:
170         b->ready = false;
171         cryptodev_vhost_user_stop(queues, s);
172         break;
173     case CHR_EVENT_BREAK:
174     case CHR_EVENT_MUX_IN:
175     case CHR_EVENT_MUX_OUT:
176         /* Ignore */
177         break;
178     }
179 }
180 
181 static void cryptodev_vhost_user_init(
182              CryptoDevBackend *backend, Error **errp)
183 {
184     int queues = backend->conf.peers.queues;
185     size_t i;
186     Error *local_err = NULL;
187     Chardev *chr;
188     CryptoDevBackendClient *cc;
189     CryptoDevBackendVhostUser *s =
190                       CRYPTODEV_BACKEND_VHOST_USER(backend);
191 
192     chr = cryptodev_vhost_claim_chardev(s, &local_err);
193     if (local_err) {
194         error_propagate(errp, local_err);
195         return;
196     }
197 
198     s->opened = true;
199 
200     for (i = 0; i < queues; i++) {
201         cc = cryptodev_backend_new_client();
202         cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
203                                        i, chr->label);
204         cc->queue_index = i;
205         cc->type = QCRYPTODEV_BACKEND_TYPE_VHOST_USER;
206 
207         backend->conf.peers.ccs[i] = cc;
208 
209         if (i == 0) {
210             if (!qemu_chr_fe_init(&s->chr, chr, errp)) {
211                 return;
212             }
213         }
214     }
215 
216     if (!vhost_user_init(&s->vhost_user, &s->chr, errp)) {
217         return;
218     }
219 
220     qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
221                      cryptodev_vhost_user_event, NULL, s, NULL, true);
222 
223     backend->conf.crypto_services =
224                          1u << QCRYPTODEV_BACKEND_SERVICE_CIPHER |
225                          1u << QCRYPTODEV_BACKEND_SERVICE_HASH |
226                          1u << QCRYPTODEV_BACKEND_SERVICE_MAC;
227     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
228     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
229 
230     backend->conf.max_size = UINT64_MAX;
231     backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
232     backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
233 }
234 
235 static int64_t cryptodev_vhost_user_crypto_create_session(
236            CryptoDevBackend *backend,
237            CryptoDevBackendSessionInfo *sess_info,
238            uint32_t queue_index, Error **errp)
239 {
240     CryptoDevBackendClient *cc =
241                    backend->conf.peers.ccs[queue_index];
242     CryptoDevBackendVhost *vhost_crypto;
243     uint64_t session_id = 0;
244     int ret;
245 
246     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
247     if (vhost_crypto) {
248         struct vhost_dev *dev = &(vhost_crypto->dev);
249         ret = dev->vhost_ops->vhost_crypto_create_session(dev,
250                                                           sess_info,
251                                                           &session_id);
252         if (ret < 0) {
253             return -1;
254         } else {
255             return session_id;
256         }
257     }
258     return -1;
259 }
260 
261 static int cryptodev_vhost_user_create_session(
262            CryptoDevBackend *backend,
263            CryptoDevBackendSessionInfo *sess_info,
264            uint32_t queue_index,
265            CryptoDevCompletionFunc cb,
266            void *opaque)
267 {
268     uint32_t op_code = sess_info->op_code;
269     int64_t ret;
270     Error *local_error = NULL;
271     int status;
272 
273     switch (op_code) {
274     case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
275     case VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION:
276     case VIRTIO_CRYPTO_HASH_CREATE_SESSION:
277     case VIRTIO_CRYPTO_MAC_CREATE_SESSION:
278     case VIRTIO_CRYPTO_AEAD_CREATE_SESSION:
279         ret = cryptodev_vhost_user_crypto_create_session(backend, sess_info,
280                    queue_index, &local_error);
281         break;
282 
283     default:
284         error_setg(&local_error, "Unsupported opcode :%" PRIu32 "",
285                    sess_info->op_code);
286         return -VIRTIO_CRYPTO_NOTSUPP;
287     }
288 
289     if (local_error) {
290         error_report_err(local_error);
291     }
292     if (ret < 0) {
293         status = -VIRTIO_CRYPTO_ERR;
294     } else {
295         sess_info->session_id = ret;
296         status = VIRTIO_CRYPTO_OK;
297     }
298     if (cb) {
299         cb(opaque, status);
300     }
301     return 0;
302 }
303 
304 static int cryptodev_vhost_user_close_session(
305            CryptoDevBackend *backend,
306            uint64_t session_id,
307            uint32_t queue_index,
308            CryptoDevCompletionFunc cb,
309            void *opaque)
310 {
311     CryptoDevBackendClient *cc =
312                   backend->conf.peers.ccs[queue_index];
313     CryptoDevBackendVhost *vhost_crypto;
314     int ret = -1, status;
315 
316     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
317     if (vhost_crypto) {
318         struct vhost_dev *dev = &(vhost_crypto->dev);
319         ret = dev->vhost_ops->vhost_crypto_close_session(dev,
320                                                          session_id);
321         if (ret < 0) {
322             status = -VIRTIO_CRYPTO_ERR;
323         } else {
324             status = VIRTIO_CRYPTO_OK;
325         }
326     } else {
327         status = -VIRTIO_CRYPTO_NOTSUPP;
328     }
329     if (cb) {
330         cb(opaque, status);
331     }
332     return 0;
333 }
334 
335 static void cryptodev_vhost_user_cleanup(
336              CryptoDevBackend *backend,
337              Error **errp)
338 {
339     CryptoDevBackendVhostUser *s =
340                       CRYPTODEV_BACKEND_VHOST_USER(backend);
341     size_t i;
342     int queues = backend->conf.peers.queues;
343     CryptoDevBackendClient *cc;
344 
345     cryptodev_vhost_user_stop(queues, s);
346 
347     for (i = 0; i < queues; i++) {
348         cc = backend->conf.peers.ccs[i];
349         if (cc) {
350             cryptodev_backend_free_client(cc);
351             backend->conf.peers.ccs[i] = NULL;
352         }
353     }
354 
355     vhost_user_cleanup(&s->vhost_user);
356 }
357 
358 static void cryptodev_vhost_user_set_chardev(Object *obj,
359                                     const char *value, Error **errp)
360 {
361     CryptoDevBackendVhostUser *s =
362                       CRYPTODEV_BACKEND_VHOST_USER(obj);
363 
364     if (s->opened) {
365         error_setg(errp, "Property 'chardev' can no longer be set");
366     } else {
367         g_free(s->chr_name);
368         s->chr_name = g_strdup(value);
369     }
370 }
371 
372 static char *
373 cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
374 {
375     CryptoDevBackendVhostUser *s =
376                       CRYPTODEV_BACKEND_VHOST_USER(obj);
377     Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
378 
379     if (chr && chr->label) {
380         return g_strdup(chr->label);
381     }
382 
383     return NULL;
384 }
385 
386 static void cryptodev_vhost_user_finalize(Object *obj)
387 {
388     CryptoDevBackendVhostUser *s =
389                       CRYPTODEV_BACKEND_VHOST_USER(obj);
390 
391     qemu_chr_fe_deinit(&s->chr, false);
392 
393     g_free(s->chr_name);
394 }
395 
396 static void
397 cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
398 {
399     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
400 
401     bc->init = cryptodev_vhost_user_init;
402     bc->cleanup = cryptodev_vhost_user_cleanup;
403     bc->create_session = cryptodev_vhost_user_create_session;
404     bc->close_session = cryptodev_vhost_user_close_session;
405     bc->do_op = NULL;
406 
407     object_class_property_add_str(oc, "chardev",
408                                   cryptodev_vhost_user_get_chardev,
409                                   cryptodev_vhost_user_set_chardev);
410 
411 }
412 
413 static const TypeInfo cryptodev_vhost_user_info = {
414     .name = TYPE_CRYPTODEV_BACKEND_VHOST_USER,
415     .parent = TYPE_CRYPTODEV_BACKEND,
416     .class_init = cryptodev_vhost_user_class_init,
417     .instance_finalize = cryptodev_vhost_user_finalize,
418     .instance_size = sizeof(CryptoDevBackendVhostUser),
419 };
420 
421 static void
422 cryptodev_vhost_user_register_types(void)
423 {
424     type_register_static(&cryptodev_vhost_user_info);
425 }
426 
427 type_init(cryptodev_vhost_user_register_types);
428