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Vector Packet Processing
packet.h
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1 #ifndef included_vnet_mpls_packet_h
2 #define included_vnet_mpls_packet_h
3 
4 /*
5  * MPLS packet format
6  *
7  * Copyright (c) 2012 Cisco and/or its affiliates.
8  * Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at:
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 
21 /**
22  * A label value only, i.e. 20bits.
23  */
24 typedef u32 mpls_label_t;
25 
26 typedef struct {
27  /* Label: top 20 bits [in network byte order] */
28  /* Experimental: 3 bits ... */
29  /* S (bottom of label stack): 1 bit */
30  /* TTL: 8 bits */
33 
34 typedef enum mpls_eos_bit_t_
35 {
37  MPLS_EOS = 1,
39 
40 #define MPLS_EOS_BITS { \
41  [MPLS_NON_EOS] = "neos", \
42  [MPLS_EOS] = "eos", \
43 }
44 
45 /**
46  * The Default TTL added to MPLS label headers when no other value is available
47  */
48 #define MPLS_LABEL_DEFAULT_TTL 64
49 
50 /**
51  * The Default EXP added to MPLS label headers when no other value is available
52  */
53 #define MPLS_LABEL_DEFAULT_EXP 0
54 
55 /**
56  * When in uniform mode convert an IPv[46] DSCP value to an MPLS EXP value
57  */
58 static inline u8 ip_dscp_to_mpls_exp (u8 tos)
59 {
60  return (tos >> 5);
61 }
62 
63 /**
64  * When in uniform mode convert an MPLS EXP value to an IPv[46] DSCP value
65  */
66 static inline u8 mpls_exp_to_ip_dscp (u8 exp)
67 {
68  return (exp << 5);
69 }
70 
71 #define FOR_EACH_MPLS_EOS_BIT(_eos) \
72  for (_eos = MPLS_NON_EOS; _eos <= MPLS_EOS; _eos++)
73 
74 #define MPLS_ENTRY_LABEL_OFFSET 0
75 #define MPLS_ENTRY_LABEL_SHIFT 12
76 #define MPLS_ENTRY_LABEL_MASK 0x000fffff
77 #define MPLS_ENTRY_LABEL_BITS \
78  (MPLS_ENTRY_LABEL_MASK << MPLS_ENTRY_LABEL_SHIFT)
79 
80 #define MPLS_ENTRY_EXP_OFFSET 2 /* byte offset to EXP bits */
81 #define MPLS_ENTRY_EXP_SHIFT 9
82 #define MPLS_ENTRY_EXP_MASK 0x07
83 #define MPLS_ENTRY_EXP(mpls) \
84  (((mpls)>>MPLS_ENTRY_EXP_SHIFT) & MPLS_ENTRY_EXP_MASK)
85 #define MPLS_ENTRY_EXP_BITS \
86  (MPLS_ENTRY_EXP_MASK << MPLS_ENTRY_EXP_SHIFT)
87 
88 #define MPLS_ENTRY_EOS_OFFSET 2 /* byte offset to EOS bit */
89 #define MPLS_ENTRY_EOS_SHIFT 8
90 #define MPLS_ENTRY_EOS_MASK 0x01 /* EOS bit in its byte */
91 #define MPLS_ENTRY_EOS(mpls) \
92  (((mpls) >> MPLS_ENTRY_EOS_SHIFT) & MPLS_ENTRY_EOS_MASK)
93 #define MPLS_ENTRY_EOS_BIT (MPLS_ENTRY_EOS_MASK << MPLS_ENTRY_EOS_SHIFT)
94 
95 #define MPLS_ENTRY_TTL_OFFSET 3 /* byte offset to ttl field */
96 #define MPLS_ENTRY_TTL_SHIFT 0
97 #define MPLS_ENTRY_TTL_MASK 0xff
98 #define MPLS_ENTRY_TTL(mpls) \
99  (((mpls) >> MPLS_ENTRY_TTL_SHIFT) & MPLS_ENTRY_TTL_MASK)
100 #define MPLS_ENTRY_TTL_BITS \
101  (MPLS_ENTRY_TTL_MASK << MPLS_ENTRY_TTL_SHIFT)
102 
103 static inline u32 vnet_mpls_uc_get_label (mpls_label_t label_exp_s_ttl)
104 {
105  return (label_exp_s_ttl>>MPLS_ENTRY_LABEL_SHIFT);
106 }
107 
108 static inline u32 vnet_mpls_uc_get_exp (mpls_label_t label_exp_s_ttl)
109 {
110  return (MPLS_ENTRY_EXP(label_exp_s_ttl));
111 }
112 
113 static inline u32 vnet_mpls_uc_get_s (mpls_label_t label_exp_s_ttl)
114 {
115  return (MPLS_ENTRY_EOS(label_exp_s_ttl));
116 }
117 
118 static inline u32 vnet_mpls_uc_get_ttl (mpls_label_t label_exp_s_ttl)
119 {
120  return (MPLS_ENTRY_TTL(label_exp_s_ttl));
121 }
122 
123 static inline void vnet_mpls_uc_set_label (mpls_label_t *label_exp_s_ttl,
124  u32 value)
125 {
126  *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_LABEL_BITS)) |
128 }
129 
130 static inline void vnet_mpls_uc_set_exp (mpls_label_t *label_exp_s_ttl,
131  u32 exp)
132 {
133  *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EXP_BITS)) |
135 }
136 
137 static inline void vnet_mpls_uc_set_s (mpls_label_t *label_exp_s_ttl,
138  u32 eos)
139 {
140  *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EOS_BIT)) |
142 }
143 
144 static inline void vnet_mpls_uc_set_ttl (mpls_label_t *label_exp_s_ttl,
145  u32 ttl)
146 {
147  *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_TTL_BITS)) |
148  ((ttl & MPLS_ENTRY_TTL_MASK)));
149 }
150 
151 #endif /* included_vnet_mpls_packet_h */
mpls_eos_bit_t_
Definition: packet.h:34
#define MPLS_ENTRY_LABEL_SHIFT
Definition: packet.h:75
#define MPLS_ENTRY_EOS_MASK
Definition: packet.h:90
#define MPLS_ENTRY_TTL_MASK
Definition: packet.h:97
u32 mpls_label_t
A label value only, i.e.
Definition: packet.h:24
#define MPLS_ENTRY_LABEL_BITS
Definition: packet.h:77
#define MPLS_ENTRY_EXP_MASK
Definition: packet.h:82
unsigned char u8
Definition: types.h:56
#define MPLS_ENTRY_EOS_SHIFT
Definition: packet.h:89
unsigned int u32
Definition: types.h:88
static u32 vnet_mpls_uc_get_ttl(mpls_label_t label_exp_s_ttl)
Definition: packet.h:118
static void vnet_mpls_uc_set_label(mpls_label_t *label_exp_s_ttl, u32 value)
Definition: packet.h:123
static void vnet_mpls_uc_set_exp(mpls_label_t *label_exp_s_ttl, u32 exp)
Definition: packet.h:130
#define MPLS_ENTRY_EOS_BIT
Definition: packet.h:93
static u32 vnet_mpls_uc_get_label(mpls_label_t label_exp_s_ttl)
Definition: packet.h:103
static u8 mpls_exp_to_ip_dscp(u8 exp)
When in uniform mode convert an MPLS EXP value to an IPv[46] DSCP value.
Definition: packet.h:66
#define MPLS_ENTRY_LABEL_MASK
Definition: packet.h:76
#define MPLS_ENTRY_EXP_BITS
Definition: packet.h:85
#define MPLS_ENTRY_EOS(mpls)
Definition: packet.h:91
#define MPLS_ENTRY_TTL(mpls)
Definition: packet.h:98
static u8 ip_dscp_to_mpls_exp(u8 tos)
When in uniform mode convert an IPv[46] DSCP value to an MPLS EXP value.
Definition: packet.h:58
mpls_label_t label_exp_s_ttl
Definition: packet.h:31
static void vnet_mpls_uc_set_s(mpls_label_t *label_exp_s_ttl, u32 eos)
Definition: packet.h:137
#define MPLS_ENTRY_EXP_SHIFT
Definition: packet.h:81
static u32 vnet_mpls_uc_get_s(mpls_label_t label_exp_s_ttl)
Definition: packet.h:113
static void vnet_mpls_uc_set_ttl(mpls_label_t *label_exp_s_ttl, u32 ttl)
Definition: packet.h:144
static u32 vnet_mpls_uc_get_exp(mpls_label_t label_exp_s_ttl)
Definition: packet.h:108
#define MPLS_ENTRY_EXP(mpls)
Definition: packet.h:83
#define MPLS_ENTRY_TTL_BITS
Definition: packet.h:100
enum mpls_eos_bit_t_ mpls_eos_bit_t