1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.net.apf; 18 19 /** 20 * APF program support capabilities. 21 * 22 * @hide 23 */ 24 public class ApfCapabilities { 25 /** 26 * Version of APF instruction set supported for packet filtering. 0 indicates no support for 27 * packet filtering using APF programs. 28 */ 29 public final int apfVersionSupported; 30 31 /** 32 * Maximum size of APF program allowed. 33 */ 34 public final int maximumApfProgramSize; 35 36 /** 37 * Format of packets passed to APF filter. Should be one of ARPHRD_* 38 */ 39 public final int apfPacketFormat; 40 41 public ApfCapabilities(int apfVersionSupported, int maximumApfProgramSize, int apfPacketFormat) 42 { 43 this.apfVersionSupported = apfVersionSupported; 44 this.maximumApfProgramSize = maximumApfProgramSize; 45 this.apfPacketFormat = apfPacketFormat; 46 } 47 48 public String toString() { 49 return String.format("%s{version: %d, maxSize: %d, format: %d}", getClass().getSimpleName(), 50 apfVersionSupported, maximumApfProgramSize, apfPacketFormat); 51 } 52 53 /** 54 * Returns true if the APF interpreter advertises support for the data buffer access opcodes 55 * LDDW and STDW. 56 * 57 * Full LDDW and STDW support is present from APFv4 on. 58 */ 59 public boolean hasDataAccess() { 60 return apfVersionSupported >= 4; 61 } 62 } 63
