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/*
* Copyright (c) 2015 Cloudbase Solutions Srl
*
* 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.
*/
#ifndef __MPLS_H_
#define __MPLS_H_ 1
#include "precomp.h"
#include "Ethernet.h"
/*
* MPLS definitions
*/
#define FLOW_MAX_MPLS_LABELS 3
#define MPLS_HLEN 4
#define MPLS_BOS_MASK 0x00000100
/* Reference: RFC 5462, RFC 3032
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Label | TC |S| TTL |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* Label: Label Value, 20 bits
* TC: Traffic Class field, 3 bits
* S: Bottom of Stack, 1 bit
* TTL: Time to Live, 8 bits
*/
typedef struct MPLSHdr {
ovs_be32 lse;
} MPLSHdr;
__inline BOOLEAN
OvsEthertypeIsMpls(ovs_be16 ethertype)
{
return ethertype == htons(ETH_TYPE_MPLS) ||
ethertype == htons(ETH_TYPE_MPLS_MCAST);
}
/* Returns the number of MPLS LSEs present in 'a'
*
* Counts 'flow''s MPLS label stack entries (LESs) stopping at the first
* entry that has the bottom of stack (BOS) bit set. If no such entry exists,
* then zero is returned, meaning that the maximum number of supported
* MPLS LSEs exceeded.
*/
__inline UINT32
OvsCountMplsLabels(PNL_ATTR a)
{
const MPLSHdr *mpls = NlAttrGet(a);
UINT32 count = 0;
BOOLEAN bos = FALSE;
for (count = 0; count < FLOW_MAX_MPLS_LABELS; count++) {
if ((mpls + count)->lse & htonl(MPLS_BOS_MASK)) {
bos = TRUE;
break;
}
}
return bos ? ++count : 0;
}
#endif /* __MPLS_H_ */
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