aboutsummaryrefslogtreecommitdiffstats
path: root/vpp-api/java/jvpp-registry/jvpp_registry.c
blob: f7f5561910a22302366f0972d93237aae4841f15 (plain)
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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#define _GNU_SOURCE /* for strcasestr(3) */
#include <vnet/vnet.h>

#define vl_api_version(n,v) static u32 vpe_api_version = (v);
#include <vpp-api/vpe.api.h>
#undef vl_api_version

#include <jni.h>
#include <jvpp-common/jvpp_common.h>
#include "io_fd_vpp_jvpp_VppJNIConnection.h"
#include "io_fd_vpp_jvpp_JVppRegistryImpl.h"

#include <vpp-api/vpe_msg_enum.h>
#define vl_typedefs             /* define message structures */
#include <vpp-api/vpe_all_api_h.h>
#undef vl_typedefs

#define vl_endianfun
#include <vpp-api/vpe_all_api_h.h>
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...)
#define vl_printfun
#include <vpp-api/vpe_all_api_h.h>
#undef vl_printfun

/*
 * The Java runtime isn't compile w/ -fstack-protector,
 * so we have to supply missing external references for the
 * regular vpp libraries.
 */
void __stack_chk_guard(void) __attribute__((weak));
void __stack_chk_guard(void) {
}

typedef struct {
    /* UThread attachment */
    volatile u32 control_ping_result_ready;
    volatile i32 control_ping_retval;

    /* Control poing callback */
    jobject registryObject;
    jclass registryClass;
    jclass controlPingReplyClass;
    jclass callbackExceptionClass;

    /* Thread cleanup */
    pthread_key_t cleanup_rx_thread_key;

    /* Connected indication */
    volatile u8 is_connected;
} jvpp_registry_main_t;

jvpp_registry_main_t jvpp_registry_main __attribute__((aligned (64)));

void vl_client_add_api_signatures(vl_api_memclnt_create_t *mp) {
    /*
     * Send the main API signature in slot 0. This bit of code must
     * match the checks in ../vpe/api/api.c: vl_msg_api_version_check().
     */
    mp->api_versions[0] = clib_host_to_net_u32(vpe_api_version);
}

/* cleanup handler for RX thread */
static_always_inline void cleanup_rx_thread(void *arg) {
    jvpp_main_t * jm = &jvpp_main;
    jvpp_registry_main_t * rm = &jvpp_registry_main;

    vppjni_lock(jm, 99);

    int getEnvStat = (*jm->jvm)->GetEnv(jm->jvm, (void **) &(jm->jenv),
    JNI_VERSION_1_8);
    if (getEnvStat == JNI_EVERSION) {
        clib_warning("Unsupported JNI version\n");
        rm->control_ping_retval = VNET_API_ERROR_UNSUPPORTED_JNI_VERSION;
        goto out;
    } else if (getEnvStat != JNI_EDETACHED) {
        (*jm->jvm)->DetachCurrentThread(jm->jvm);
    }
    out: vppjni_unlock(jm);
}

static void vl_api_control_ping_reply_t_handler(
        vl_api_control_ping_reply_t * mp) {
    jvpp_main_t * jm = &jvpp_main;
    jvpp_registry_main_t * rm = &jvpp_registry_main;
    char was_thread_connected = 0;

    // attach to java thread if not attached
    int getEnvStat = (*jm->jvm)->GetEnv(jm->jvm, (void **) &(jm->jenv),
            JNI_VERSION_1_8);
    if (getEnvStat == JNI_EDETACHED) {
        if ((*jm->jvm)->AttachCurrentThread(jm->jvm, (void **) &(jm->jenv),
                NULL) != 0) {
            clib_warning("Failed to attach thread\n");
            rm->control_ping_retval =
                    VNET_API_ERROR_FAILED_TO_ATTACH_TO_JAVA_THREAD;
            goto out;
        }

        // workaround as we can't use pthread_cleanup_push
        pthread_key_create(&rm->cleanup_rx_thread_key, cleanup_rx_thread);
        // destructor is only called if the value of key is non null
        pthread_setspecific(rm->cleanup_rx_thread_key, (void *) 1);
        was_thread_connected = 1;
    } else if (getEnvStat == JNI_EVERSION) {
        clib_warning("Unsupported JNI version\n");
        rm->control_ping_retval = VNET_API_ERROR_UNSUPPORTED_JNI_VERSION;
        goto out;
    }

    if (was_thread_connected == 0) {
        JNIEnv *env = jm->jenv;
        if (mp->retval < 0) {
            call_on_error("controlPing", mp->context, mp->retval,
                    rm->registryClass, rm->registryObject,
                    rm->callbackExceptionClass);
        } else {
            jmethodID constructor = (*env)->GetMethodID(env,
                    rm->controlPingReplyClass, "<init>", "()V");
            jmethodID callbackMethod = (*env)->GetMethodID(env,
                    rm->registryClass, "onControlPingReply",
                    "(Lio/fd/vpp/jvpp/dto/ControlPingReply;)V");

            jobject dto = (*env)->NewObject(env, rm->controlPingReplyClass,
                    constructor);

            jfieldID contextFieldId = (*env)->GetFieldID(env,
                    rm->controlPingReplyClass, "context", "I");
            (*env)->SetIntField(env, dto, contextFieldId,
                    clib_net_to_host_u32(mp->context));

            jfieldID clientIndexFieldId = (*env)->GetFieldID(env,
                    rm->controlPingReplyClass, "clientIndex", "I");
            (*env)->SetIntField(env, dto, clientIndexFieldId,
                    clib_net_to_host_u32(mp->client_index));

            jfieldID vpePidFieldId = (*env)->GetFieldID(env,
                    rm->controlPingReplyClass, "vpePid", "I");
            (*env)->SetIntField(env, dto, vpePidFieldId,
                    clib_net_to_host_u32(mp->vpe_pid));

            (*env)->CallVoidMethod(env, rm->registryObject, callbackMethod,
                    dto);
            (*env)->DeleteLocalRef(env, dto);
        }
    }

    out: rm->control_ping_result_ready = 1;
}

static int send_initial_control_ping() {
    f64 timeout;
    clib_time_t clib_time;
    vl_api_control_ping_t * mp;
    jvpp_main_t * jm = &jvpp_main;
    jvpp_registry_main_t * rm = &jvpp_registry_main;

    clib_time_init(&clib_time);

    rm->control_ping_result_ready = 0;
    mp = vl_msg_api_alloc(sizeof(*mp));
    memset(mp, 0, sizeof(*mp));
    mp->_vl_msg_id = ntohs(VL_API_CONTROL_PING);
    mp->client_index = jm->my_client_index;

    // send message:
    vl_msg_api_send_shmem(jm->vl_input_queue, (u8 *) &mp);

    // wait for results: Current time + 10 seconds is the timeout
    timeout = clib_time_now(&clib_time) + 10.0;
    int rv = VNET_API_ERROR_RESPONSE_NOT_READY;
    while (clib_time_now(&clib_time) < timeout) {
        if (rm->control_ping_result_ready == 1) {
            rv = rm->control_ping_retval;
            break;
        }
    }

    if (rv != 0) {
        clib_warning("common: first control ping failed: %d", rv);
    }

    return rv;
}

static int connect_to_vpe(char *name) {
    jvpp_main_t * jm = &jvpp_main;
    api_main_t * am = &api_main;

    if (vl_client_connect_to_vlib("/vpe-api", name, 32) < 0)
        return -1;

    jm->my_client_index = am->my_client_index;

    jm->vl_input_queue = am->shmem_hdr->vl_input_queue;

    vl_msg_api_set_handlers(VL_API_CONTROL_PING_REPLY, "control_ping_reply",
            vl_api_control_ping_reply_t_handler, vl_noop_handler,
            vl_api_control_ping_reply_t_endian,
            vl_api_control_ping_reply_t_print,
            sizeof(vl_api_control_ping_reply_t), 1);

    return send_initial_control_ping();
}

JNIEXPORT jobject JNICALL Java_io_fd_vpp_jvpp_VppJNIConnection_clientConnect(
        JNIEnv *env, jclass obj, jstring clientName) {
    int rv;
    const char *client_name;
    void vl_msg_reply_handler_hookup(void);
    jvpp_main_t * jm = &jvpp_main;
    jvpp_registry_main_t * rm = &jvpp_registry_main;

    jclass connectionInfoClass = (*env)->FindClass(env,
            "io/fd/vpp/jvpp/VppJNIConnection$ConnectionInfo");
    jmethodID connectionInfoConstructor = (*env)->GetMethodID(env,
            connectionInfoClass, "<init>", "(JII)V");

    /*
     * Bail out now if we're not running as root
     */
    if (geteuid() != 0) {
        return (*env)->NewObject(env, connectionInfoClass,
                connectionInfoConstructor, 0, 0,
                VNET_API_ERROR_NOT_RUNNING_AS_ROOT);
    }

    if (rm->is_connected) {
        return (*env)->NewObject(env, connectionInfoClass,
                connectionInfoConstructor, 0, 0,
                VNET_API_ERROR_ALREADY_CONNECTED);
    }

    client_name = (*env)->GetStringUTFChars(env, clientName, 0);
    if (!client_name) {
        return (*env)->NewObject(env, connectionInfoClass,
                connectionInfoConstructor, 0, 0, VNET_API_ERROR_INVALID_VALUE);
    }

    rv = connect_to_vpe((char *) client_name);

    if (rv < 0)
        clib_warning("connection failed, rv %d", rv);

    (*env)->ReleaseStringUTFChars(env, clientName, client_name);

    return (*env)->NewObject(env, connectionInfoClass,
            connectionInfoConstructor, (jlong) jm->vl_input_queue,
            (jint) jm->my_client_index, (jint) rv);
}

JNIEXPORT jint JNICALL Java_io_fd_vpp_jvpp_JVppRegistryImpl_controlPing0(
        JNIEnv *env, jobject regstryObject) {
    jvpp_main_t * jm = &jvpp_main;
    vl_api_control_ping_t * mp;
    u32 my_context_id = vppjni_get_context_id(&jvpp_main);
    jvpp_registry_main_t * rm = &jvpp_registry_main;

    if (rm->registryObject == 0) {
        rm->registryObject = (*env)->NewGlobalRef(env, regstryObject);
    }
    if (rm->registryClass == 0) {
        rm->registryClass = (jclass) (*env)->NewGlobalRef(env,
                (*env)->GetObjectClass(env, regstryObject));
    }

    mp = vl_msg_api_alloc(sizeof(*mp));
    memset(mp, 0, sizeof(*mp));
    mp->_vl_msg_id = ntohs(VL_API_CONTROL_PING);
    mp->client_index = jm->my_client_index;
    mp->context = clib_host_to_net_u32(my_context_id);

    // send message:
    vl_msg_api_send_shmem(jm->vl_input_queue, (u8 *) &mp);
    return my_context_id;
}

JNIEXPORT void JNICALL Java_io_fd_vpp_jvpp_VppJNIConnection_clientDisconnect(
        JNIEnv *env, jclass clazz) {
    jvpp_registry_main_t * rm = &jvpp_registry_main;
    rm->is_connected = 0; // TODO make thread safe
    vl_client_disconnect_from_vlib();

    // cleanup:
    if (rm->registryObject) {
        (*env)->DeleteGlobalRef(env, rm->registryObject);
        rm->registryObject = 0;
    }
    if (rm->registryClass) {
        (*env)->DeleteGlobalRef(env, rm->registryClass);
        rm->registryClass = 0;
    }
}

jint JNI_OnLoad(JavaVM *vm, void *reserved) {
    jvpp_main_t * jm = &jvpp_main;
    jvpp_registry_main_t * rm = &jvpp_registry_main;
    JNIEnv* env;

    if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_8) != JNI_OK) {
        return JNI_EVERSION;
    }

    rm->controlPingReplyClass = (jclass) (*env)->NewGlobalRef(env,
            (*env)->FindClass(env, "io/fd/vpp/jvpp/dto/ControlPingReply"));
    if ((*env)->ExceptionCheck(env)) {
        (*env)->ExceptionDescribe(env);
        clib_warning("Failed to cache class references\n");
        return JNI_ERR;
    }

    rm->callbackExceptionClass = (jclass) (*env)->NewGlobalRef(env,
            (*env)->FindClass(env, "io/fd/vpp/jvpp/VppCallbackException"));
    if ((*env)->ExceptionCheck(env)) {
        (*env)->ExceptionDescribe(env);
        return JNI_ERR;
    }

    jm->jvm = vm;
    return JNI_VERSION_1_8;
}

void JNI_OnUnload(JavaVM *vm, void *reserved) {
    jvpp_main_t * jm = &jvpp_main;
    JNIEnv* env;
    if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_8) != JNI_OK) {
        return;
    }

    jm->jenv = NULL;
    jm->jvm = NULL;
}