FD.io VPP  v20.05.1-6-gf53edbc3b
Vector Packet Processing
lisp_gpe_packet.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /**
16  * @file
17  * @brief LISP-GPE packet header structure
18  *
19  */
20 
21 #ifndef included_lisp_gpe_packet_h
22 #define included_lisp_gpe_packet_h
23 
24 /*
25  * From draft-lewis-lisp-gpe-02.txt
26  *
27  * 0 1 2 3
28  * 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
29  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
30  * |N|L|E|V|I|P|R|O|Ver| Reserved | Next Protocol |
31  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
32  * | Instance ID/Locator-Status-Bits |
33  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
34  *
35  * N: The N-bit is the nonce-present bit. When this bit is set to 1,
36  * the low-order 24 bits of the first 32 bits of the LISP header
37  * contain a Nonce. See Section 6.3.1 for details. Both N- and
38  * V-bits MUST NOT be set in the same packet. If they are, a
39  * decapsulating ETR MUST treat the 'Nonce/Map-Version' field as
40  * having a Nonce value present.
41  *
42  * L: The L-bit is the 'Locator-Status-Bits' field enabled bit. When
43  * this bit is set to 1, the Locator-Status-Bits in the second
44  * 32 bits of the LISP header are in use.
45  *
46  * E: The E-bit is the echo-nonce-request bit. This bit MUST be ignored
47  * and has no meaning when the N-bit is set to 0. When the N-bit is
48  * set to 1 and this bit is set to 1, an ITR is requesting that the
49  * nonce value in the 'Nonce' field be echoed back in LISP-
50  * encapsulated packets when the ITR is also an ETR. See
51  * Section 6.3.1 for details.
52  *
53  * V: The V-bit is the Map-Version present bit. When this bit is set to
54  * 1, the N-bit MUST be 0. Refer to Section 6.6.3 for more details.
55  *
56  * I: The I-bit is the Instance ID bit. See Section 5.5 for more
57  * details. When this bit is set to 1, the 'Locator-Status-Bits'
58  * field is reduced to 8 bits and the high-order 24 bits are used as
59  * an Instance ID. If the L-bit is set to 0, then the low-order
60  * 8 bits are transmitted as zero and ignored on receipt.
61  *
62  * P Bit: Flag bit 5 is defined as the Next Protocol bit. The P bit
63  * MUST be set to 1 to indicate the presence of the 8 bit next
64  * protocol field.
65  *
66  * P = 0 indicates that the payload MUST conform to LISP as defined
67  * in [RFC6830].
68  *
69  * Flag bit 5 was chosen as the P bit because this flag bit is
70  * currently unallocated in LISP [RFC6830].
71  *
72  * O: Flag bit 7 is defined as the O bit. When the O bit is set to 1, the
73  * packet is an OAM packet and OAM processing MUST occur. The OAM
74  * protocol details are out of scope for this document. As with the
75  * P-bit, bit 7 is currently a reserved flag in [RFC6830].
76  *
77  * Next Protocol Field: The lower 8 bits of the first word are used to
78  * carry a next protocol. This next protocol field contains the
79  * protocol of the encapsulated payload packet.
80  *
81  * LISP [RFC6830] uses the lower 16 bits of the first word for either
82  * a nonce, an echo-nonce ([RFC6830]) or to support map-versioning
83  * ([RFC6834]). These are all optional capabilities that are
84  * indicated by setting the N, E, and the V bit respectively.
85  *
86  * To maintain the desired data plane compatibility, when the P bit
87  * is set, the N, E, and V bits MUST be set to zero.
88  *
89  * A new protocol registry will be requested from IANA for the Next
90  * Protocol field. This draft defines the following Next Protocol
91  * values:
92  *
93  * 0x1 : IPv4
94  * 0x2 : IPv6
95  * 0x3 : Ethernet
96  * 0x4: Network Service Header
97  */
98 
99 /** LISP-GPE header */
100 typedef struct
101 {
108 
109 #define foreach_lisp_gpe_flag_bit \
110 _(N, 0x80) \
111 _(L, 0x40) \
112 _(E, 0x20) \
113 _(V, 0x10) \
114 _(I, 0x08) \
115 _(P, 0x04) \
116 _(O, 0x01)
117 
118 typedef enum
119 {
120 #define _(n,v) LISP_GPE_FLAGS_##n = v,
122 #undef _
124 
125 #define LISP_GPE_VERSION 0x0
126 
127 #define LISP_GPE_NEXT_PROTOCOL_IP4 0x1
128 #define LISP_GPE_NEXT_PROTOCOL_IP6 0x2
129 #define LISP_GPE_NEXT_PROTOCOL_ETHERNET 0x3
130 #define LISP_GPE_NEXT_PROTOCOL_NSH 0x4
131 
132 typedef enum
133 {
140 
141 #endif /* included_lisp_gpe_packet_h */
142 
143 /*
144  * fd.io coding-style-patch-verification: ON
145  *
146  * Local Variables:
147  * eval: (c-set-style "gnu")
148  * End:
149  */
unsigned char u8
Definition: types.h:56
unsigned int u32
Definition: types.h:88
vnet_lisp_gpe_flag_bit_t
#define foreach_lisp_gpe_flag_bit
LISP-GPE header.
lisp_gpe_next_protocol_e