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/*
* MPLS packet format
*
* Copyright (c) 2012 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.
*/
#ifndef included_vnet_mpls_packet_h
#define included_vnet_mpls_packet_h
#include <vnet/ip/ip_packet.h>
/**
* A label value only, i.e. 20bits.
*/
typedef u32 mpls_label_t;
typedef struct {
/* Label: top 20 bits [in network byte order] */
/* Experimental: 3 bits ... */
/* S (bottom of label stack): 1 bit */
/* TTL: 8 bits */
mpls_label_t label_exp_s_ttl;
} mpls_unicast_header_t;
typedef enum mpls_eos_bit_t_
{
MPLS_NON_EOS = 0,
MPLS_EOS = 1,
} mpls_eos_bit_t;
#define MPLS_EOS_BITS { \
[MPLS_NON_EOS] = "neos", \
[MPLS_EOS] = "eos", \
}
/**
* The Default TTL added to MPLS label headers when no other value is available
*/
#define MPLS_LABEL_DEFAULT_TTL 64
/**
* The Default EXP added to MPLS label headers when no other value is available
*/
#define MPLS_LABEL_DEFAULT_EXP 0
/**
* When in uniform mode convert an IPv[46] DSCP value to an MPLS EXP value
*/
static inline u8 ip_dscp_to_mpls_exp (ip_dscp_t tos)
{
return (tos >> 5);
}
/**
* When in uniform mode convert an MPLS EXP value to an IPv[46] DSCP value
*/
static inline u8 mpls_exp_to_ip_dscp (u8 exp)
{
return (exp << 5);
}
#define FOR_EACH_MPLS_EOS_BIT(_eos) \
for (_eos = MPLS_NON_EOS; _eos <= MPLS_EOS; _eos++)
#define MPLS_ENTRY_LABEL_OFFSET 0
#define MPLS_ENTRY_LABEL_SHIFT 12
#define MPLS_ENTRY_LABEL_MASK 0x000fffff
#define MPLS_ENTRY_LABEL_BITS \
(MPLS_ENTRY_LABEL_MASK << MPLS_ENTRY_LABEL_SHIFT)
#define MPLS_ENTRY_EXP_OFFSET 2 /* byte offset to EXP bits */
#define MPLS_ENTRY_EXP_SHIFT 9
#define MPLS_ENTRY_EXP_MASK 0x07
#define MPLS_ENTRY_EXP(mpls) \
(((mpls)>>MPLS_ENTRY_EXP_SHIFT) & MPLS_ENTRY_EXP_MASK)
#define MPLS_ENTRY_EXP_BITS \
(MPLS_ENTRY_EXP_MASK << MPLS_ENTRY_EXP_SHIFT)
#define MPLS_ENTRY_EOS_OFFSET 2 /* byte offset to EOS bit */
#define MPLS_ENTRY_EOS_SHIFT 8
#define MPLS_ENTRY_EOS_MASK 0x01 /* EOS bit in its byte */
#define MPLS_ENTRY_EOS(mpls) \
(((mpls) >> MPLS_ENTRY_EOS_SHIFT) & MPLS_ENTRY_EOS_MASK)
#define MPLS_ENTRY_EOS_BIT (MPLS_ENTRY_EOS_MASK << MPLS_ENTRY_EOS_SHIFT)
#define MPLS_ENTRY_TTL_OFFSET 3 /* byte offset to ttl field */
#define MPLS_ENTRY_TTL_SHIFT 0
#define MPLS_ENTRY_TTL_MASK 0xff
#define MPLS_ENTRY_TTL(mpls) \
(((mpls) >> MPLS_ENTRY_TTL_SHIFT) & MPLS_ENTRY_TTL_MASK)
#define MPLS_ENTRY_TTL_BITS \
(MPLS_ENTRY_TTL_MASK << MPLS_ENTRY_TTL_SHIFT)
static inline u32 vnet_mpls_uc_get_label (mpls_label_t label_exp_s_ttl)
{
return (label_exp_s_ttl>>MPLS_ENTRY_LABEL_SHIFT);
}
static inline u32 vnet_mpls_uc_get_exp (mpls_label_t label_exp_s_ttl)
{
return (MPLS_ENTRY_EXP(label_exp_s_ttl));
}
static inline u32 vnet_mpls_uc_get_s (mpls_label_t label_exp_s_ttl)
{
return (MPLS_ENTRY_EOS(label_exp_s_ttl));
}
static inline u32 vnet_mpls_uc_get_ttl (mpls_label_t label_exp_s_ttl)
{
return (MPLS_ENTRY_TTL(label_exp_s_ttl));
}
static inline void vnet_mpls_uc_set_label (mpls_label_t *label_exp_s_ttl,
u32 value)
{
*label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_LABEL_BITS)) |
((value & MPLS_ENTRY_LABEL_MASK) << MPLS_ENTRY_LABEL_SHIFT));
}
static inline void vnet_mpls_uc_set_exp (mpls_label_t *label_exp_s_ttl,
u32 exp)
{
*label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EXP_BITS)) |
((exp & MPLS_ENTRY_EXP_MASK) << MPLS_ENTRY_EXP_SHIFT));
}
static inline void vnet_mpls_uc_set_s (mpls_label_t *label_exp_s_ttl,
u32 eos)
{
*label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EOS_BIT)) |
((eos & MPLS_ENTRY_EOS_MASK) << MPLS_ENTRY_EOS_SHIFT));
}
static inline void vnet_mpls_uc_set_ttl (mpls_label_t *label_exp_s_ttl,
u32 ttl)
{
*label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_TTL_BITS)) |
((ttl & MPLS_ENTRY_TTL_MASK)));
}
#endif /* included_vnet_mpls_packet_h */
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