Merge "remove dead portions of BpfUtils.java" into main am: bee431759a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2803204

Change-Id: Ib920e77884fb0d1d88d45c93a84cbd19b7244484
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

service/src/com/android/server/ConnectivityService.java

@@ -1538,9 +1538,9 @@ public class ConnectivityService extends IConnectivityManager.Stub
         /**
          * Get BPF program Id from CGROUP. See {@link BpfUtils#getProgramId}.
          */
-        public int getBpfProgramId(final int attachType, @NonNull final String cgroupPath)
+        public int getBpfProgramId(final int attachType)
                 throws IOException {
-            return BpfUtils.getProgramId(attachType, cgroupPath);
+            return BpfUtils.getProgramId(attachType);
         }
 
         /**
@@ -3274,15 +3274,15 @@ public class ConnectivityService extends IConnectivityManager.Stub
         pw.increaseIndent();
         try {
             pw.print("CGROUP_INET_INGRESS: ");
-            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_INGRESS, BpfUtils.CGROUP_PATH));
+            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_INGRESS));
             pw.print("CGROUP_INET_EGRESS: ");
-            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_EGRESS, BpfUtils.CGROUP_PATH));
+            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_EGRESS));
             pw.print("CGROUP_INET_SOCK_CREATE: ");
-            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_SOCK_CREATE, BpfUtils.CGROUP_PATH));
+            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET_SOCK_CREATE));
             pw.print("CGROUP_INET4_BIND: ");
-            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET4_BIND, BpfUtils.CGROUP_PATH));
+            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET4_BIND));
             pw.print("CGROUP_INET6_BIND: ");
-            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET6_BIND, BpfUtils.CGROUP_PATH));
+            pw.println(mDeps.getBpfProgramId(BPF_CGROUP_INET6_BIND));
         } catch (IOException e) {
             pw.println("  IOException");
         }
@@ -10816,7 +10816,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
                         // If type can't be parsed, this throws NumberFormatException, which
                         // is passed back to adb who prints it.
                         final int type = Integer.parseInt(getNextArg());
-                        final int ret = BpfUtils.getProgramId(type, BpfUtils.CGROUP_PATH);
+                        final int ret = BpfUtils.getProgramId(type);
                         pw.println(ret);
                         return 0;
                     }

staticlibs/device/com/android/net/module/util/BpfUtils.java

@@ -40,50 +40,19 @@ public class BpfUtils {
     // on T+ devices as well, but this is not guaranteed.
     public static final String CGROUP_PATH = "/sys/fs/cgroup/";
 
-    /**
-     * Attach BPF program to CGROUP
-     */
-    public static void attachProgram(int type, @NonNull String programPath,
-            @NonNull String cgroupPath, int flags) throws IOException {
-        native_attachProgramToCgroup(type, programPath, cgroupPath, flags);
-    }
-
-    /**
-     * Detach BPF program from CGROUP
-     */
-    public static void detachProgram(int type, @NonNull String cgroupPath)
-            throws IOException {
-        native_detachProgramFromCgroup(type, cgroupPath);
-    }
-
     /**
      * Get BPF program Id from CGROUP.
      *
      * Note: This requires a 4.19 kernel which is only guaranteed on V+.
      *
      * @param attachType Bpf attach type. See bpf_attach_type in include/uapi/linux/bpf.h.
-     * @param cgroupPath Path of cgroup.
      * @return Positive integer for a Program Id. 0 if no program is attached.
      * @throws IOException if failed to open the cgroup directory or query bpf program.
      */
-    public static int getProgramId(int attachType, @NonNull String cgroupPath) throws IOException {
+    public static int getProgramId(int attachType) throws IOException {
-        return native_getProgramIdFromCgroup(attachType, cgroupPath);
+        return native_getProgramIdFromCgroup(attachType, CGROUP_PATH);
     }
 
-    /**
-     * Detach single BPF program from CGROUP
-     */
-    public static void detachSingleProgram(int type, @NonNull String programPath,
-            @NonNull String cgroupPath) throws IOException {
-        native_detachSingleProgramFromCgroup(type, programPath, cgroupPath);
-    }
-
-    private static native boolean native_attachProgramToCgroup(int type, String programPath,
-            String cgroupPath, int flags) throws IOException;
-    private static native boolean native_detachProgramFromCgroup(int type, String cgroupPath)
-            throws IOException;
-    private static native boolean native_detachSingleProgramFromCgroup(int type,
-            String programPath, String cgroupPath) throws IOException;
     private static native int native_getProgramIdFromCgroup(int type, String cgroupPath)
             throws IOException;
 }

staticlibs/native/bpfutiljni/com_android_net_module_util_BpfUtils.cpp

@@ -30,86 +30,6 @@ namespace android {
 
 using base::unique_fd;
 
-// If attach fails throw error and return false.
-static jboolean com_android_net_module_util_BpfUtil_attachProgramToCgroup(JNIEnv *env,
-        jclass clazz, jint type, jstring bpfProgPath, jstring cgroupPath, jint flags) {
-
-    ScopedUtfChars dirPath(env, cgroupPath);
-    unique_fd cg_fd(open(dirPath.c_str(), O_DIRECTORY | O_RDONLY | O_CLOEXEC));
-    if (cg_fd == -1) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to open the cgroup directory %s: %s",
-                             dirPath.c_str(), strerror(errno));
-        return false;
-    }
-
-    ScopedUtfChars bpfProg(env, bpfProgPath);
-    unique_fd bpf_fd(bpf::retrieveProgram(bpfProg.c_str()));
-    if (bpf_fd == -1) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to retrieve bpf program from %s: %s",
-                             bpfProg.c_str(), strerror(errno));
-        return false;
-    }
-    if (bpf::attachProgram((bpf_attach_type) type, bpf_fd, cg_fd, flags)) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to attach bpf program %s to %s: %s",
-                             bpfProg.c_str(), dirPath.c_str(), strerror(errno));
-        return false;
-    }
-    return true;
-}
-
-// If detach fails throw error and return false.
-static jboolean com_android_net_module_util_BpfUtil_detachProgramFromCgroup(JNIEnv *env,
-        jclass clazz, jint type, jstring cgroupPath) {
-
-    ScopedUtfChars dirPath(env, cgroupPath);
-    unique_fd cg_fd(open(dirPath.c_str(), O_DIRECTORY | O_RDONLY | O_CLOEXEC));
-    if (cg_fd == -1) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to open the cgroup directory %s: %s",
-                             dirPath.c_str(), strerror(errno));
-        return false;
-    }
-
-    if (bpf::detachProgram((bpf_attach_type) type, cg_fd)) {
-        jniThrowExceptionFmt(env, "Failed to detach bpf program from %s: %s",
-                dirPath.c_str(), strerror(errno));
-        return false;
-    }
-    return true;
-}
-
-// If detach single program fails throw error and return false.
-static jboolean com_android_net_module_util_BpfUtil_detachSingleProgramFromCgroup(JNIEnv *env,
-        jclass clazz, jint type, jstring bpfProgPath, jstring cgroupPath) {
-
-    ScopedUtfChars dirPath(env, cgroupPath);
-    unique_fd cg_fd(open(dirPath.c_str(), O_DIRECTORY | O_RDONLY | O_CLOEXEC));
-    if (cg_fd == -1) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to open the cgroup directory %s: %s",
-                             dirPath.c_str(), strerror(errno));
-        return false;
-    }
-
-    ScopedUtfChars bpfProg(env, bpfProgPath);
-    unique_fd bpf_fd(bpf::retrieveProgram(bpfProg.c_str()));
-    if (bpf_fd == -1) {
-        jniThrowExceptionFmt(env, "java/io/IOException",
-                             "Failed to retrieve bpf program from %s: %s",
-                             bpfProg.c_str(), strerror(errno));
-        return false;
-    }
-    if (bpf::detachSingleProgram((bpf_attach_type) type, bpf_fd, cg_fd)) {
-        jniThrowExceptionFmt(env, "Failed to detach bpf program %s from %s: %s",
-                bpfProg.c_str(), dirPath.c_str(), strerror(errno));
-        return false;
-    }
-    return true;
-}
-
 static jint com_android_net_module_util_BpfUtil_getProgramIdFromCgroup(JNIEnv *env,
         jclass clazz, jint type, jstring cgroupPath) {
 
@@ -138,12 +58,6 @@ static jint com_android_net_module_util_BpfUtil_getProgramIdFromCgroup(JNIEnv *e
  */
 static const JNINativeMethod gMethods[] = {
     /* name, signature, funcPtr */
-    { "native_attachProgramToCgroup", "(ILjava/lang/String;Ljava/lang/String;I)Z",
-        (void*) com_android_net_module_util_BpfUtil_attachProgramToCgroup },
-    { "native_detachProgramFromCgroup", "(ILjava/lang/String;)Z",
-        (void*) com_android_net_module_util_BpfUtil_detachProgramFromCgroup },
-    { "native_detachSingleProgramFromCgroup", "(ILjava/lang/String;Ljava/lang/String;)Z",
-        (void*) com_android_net_module_util_BpfUtil_detachSingleProgramFromCgroup },
     { "native_getProgramIdFromCgroup", "(ILjava/lang/String;)I",
         (void*) com_android_net_module_util_BpfUtil_getProgramIdFromCgroup },
 };

tests/unit/java/com/android/server/ConnectivityServiceTest.java

@@ -2299,7 +2299,7 @@ public class ConnectivityServiceTest {
         }
 
         @Override
-        public int getBpfProgramId(final int attachType, @NonNull final String cgroupPath) {
+        public int getBpfProgramId(final int attachType) {
             return 0;
         }