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/*
* 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.
*/
package io.fd.honeycomb.translate.v3po.interfaces.acl.ingress;
import com.google.common.primitives.Ints;
import io.fd.honeycomb.translate.vpp.util.Ipv4Translator;
import io.fd.vpp.jvpp.core.dto.ClassifyAddDelSession;
import io.fd.vpp.jvpp.core.dto.ClassifyAddDelTable;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.packet.fields.rev160708.AclIpHeaderFields;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.packet.fields.rev160708.AclIpv4HeaderFields;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.acl.rev161214.InterfaceMode;
import org.slf4j.Logger;
public interface Ip4AclTranslator extends Ipv4Translator {
int ETHER_TYPE_OFFSET = 12; // first 14 bytes represent L2 header (2x6)
int DSCP_OFFSET = 15;
int DSCP_MASK = 0xfc;
int IP_PROTOCOL_OFFSET = ETHER_TYPE_OFFSET + 11;
int IP_PROTOCOL_MASK = 0xff;
int IP4_LEN = 4;
int IP4_MASK_BIT_LENGTH = 32;
int SRC_IP_OFFSET = ETHER_TYPE_OFFSET + 14;
int DST_IP_OFFSET = SRC_IP_OFFSET + IP4_LEN;
default boolean ip4Mask(final int baseOffset, final InterfaceMode mode, final AclIpHeaderFields header,
final AclIpv4HeaderFields ip4, final ClassifyAddDelTable request, final Logger log) {
boolean aceIsEmpty = true;
if (InterfaceMode.L2.equals(mode)) {
// in L2 mode we need to match ether type
request.mask[baseOffset + ETHER_TYPE_OFFSET] = (byte) 0xff;
request.mask[baseOffset + ETHER_TYPE_OFFSET + 1] = (byte) 0xff;
}
if (header.getDscp() != null) {
aceIsEmpty = false;
request.mask[baseOffset + DSCP_OFFSET] = (byte) DSCP_MASK; // first 6 bits
}
if (header.getProtocol() != null) { // Internet Protocol number
aceIsEmpty = false;
request.mask[baseOffset + IP_PROTOCOL_OFFSET] = (byte) IP_PROTOCOL_MASK;
}
if (header.getSourcePortRange() != null) {
log.warn("L4 Header fields are not supported. Ignoring {}", header.getSourcePortRange());
}
if (header.getDestinationPortRange() != null) {
log.warn("L4 Header fields are not supported. Ignoring {}", header.getDestinationPortRange());
}
if (ip4.getSourceIpv4Network() != null) {
aceIsEmpty = false;
System.arraycopy(Impl.toByteMask(ip4.getSourceIpv4Network()), 0, request.mask,
baseOffset + SRC_IP_OFFSET, IP4_LEN);
}
if (ip4.getDestinationIpv4Network() != null) {
aceIsEmpty = false;
System.arraycopy(Impl.toByteMask(ip4.getDestinationIpv4Network()), 0, request.mask,
baseOffset + DST_IP_OFFSET, IP4_LEN);
}
return aceIsEmpty;
}
default boolean ip4Match(final int baseOffset, final InterfaceMode mode, final AclIpHeaderFields header,
final AclIpv4HeaderFields ip4, final ClassifyAddDelSession request, final Logger log) {
boolean noMatch = true;
if (InterfaceMode.L2.equals(mode)) {
// match IP4 etherType (0x0800)
request.match[baseOffset + ETHER_TYPE_OFFSET] = 0x08;
request.match[baseOffset + ETHER_TYPE_OFFSET + 1] = 0x00;
}
if (header.getDscp() != null) {
noMatch = false;
request.match[baseOffset + DSCP_OFFSET] = (byte) (DSCP_MASK & (header.getDscp().getValue() << 2));
}
if (header.getProtocol() != null) { // Internet Protocol number
noMatch = false;
request.match[baseOffset + IP_PROTOCOL_OFFSET] = (byte) (IP_PROTOCOL_MASK & header.getProtocol());
}
if (header.getSourcePortRange() != null) {
log.warn("L4 Header fields are not supported. Ignoring {}", header.getSourcePortRange());
}
if (header.getDestinationPortRange() != null) {
log.warn("L4 Header fields are not supported. Ignoring {}", header.getDestinationPortRange());
}
if (ip4.getSourceIpv4Network() != null) {
noMatch = false;
System.arraycopy(Impl.toMatchValue(ip4.getSourceIpv4Network()), 0, request.match,
baseOffset + SRC_IP_OFFSET, IP4_LEN);
}
if (ip4.getDestinationIpv4Network() != null) {
noMatch = false;
System.arraycopy(Impl.toMatchValue(ip4.getDestinationIpv4Network()), 0, request.match,
baseOffset + DST_IP_OFFSET, IP4_LEN);
}
return noMatch;
}
class Impl {
private static byte[] toByteMask(final int prefixLength) {
final long mask = ((1L << prefixLength) - 1) << (IP4_MASK_BIT_LENGTH - prefixLength);
return Ints.toByteArray((int) mask);
}
private static byte[] toByteMask(final Ipv4Prefix ipv4Prefix) {
final int prefixLength = Byte.valueOf(ipv4Prefix.getValue().split("/")[1]);
return toByteMask(prefixLength);
}
private static byte[] toMatchValue(final Ipv4Prefix ipv4Prefix) {
final String[] split = ipv4Prefix.getValue().split("/");
final byte[] addressBytes = Ipv4Translator.INSTANCE.ipv4AddressNoZoneToArray(split[0]);
final byte[] mask = Impl.toByteMask(Byte.valueOf(split[1]));
for (int i = 0; i < addressBytes.length; ++i) {
addressBytes[i] &= mask[i];
}
return addressBytes;
}
}
}
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