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Vector Packet Processing
lisp_gpe_packet.h
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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 #ifndef included_lisp_gpe_packet_h
17 #define included_lisp_gpe_packet_h
18 
19 /*
20  * From draft-lewis-lisp-gpe-02.txt
21  *
22  * 0 1 2 3
23  * 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
24  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
25  * |N|L|E|V|I|P|R|O|Ver| Reserved | Next Protocol |
26  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
27  * | Instance ID/Locator-Status-Bits |
28  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
29  *
30  * N: The N-bit is the nonce-present bit. When this bit is set to 1,
31  * the low-order 24 bits of the first 32 bits of the LISP header
32  * contain a Nonce. See Section 6.3.1 for details. Both N- and
33  * V-bits MUST NOT be set in the same packet. If they are, a
34  * decapsulating ETR MUST treat the 'Nonce/Map-Version' field as
35  * having a Nonce value present.
36  *
37  * L: The L-bit is the 'Locator-Status-Bits' field enabled bit. When
38  * this bit is set to 1, the Locator-Status-Bits in the second
39  * 32 bits of the LISP header are in use.
40  *
41  * E: The E-bit is the echo-nonce-request bit. This bit MUST be ignored
42  * and has no meaning when the N-bit is set to 0. When the N-bit is
43  * set to 1 and this bit is set to 1, an ITR is requesting that the
44  * nonce value in the 'Nonce' field be echoed back in LISP-
45  * encapsulated packets when the ITR is also an ETR. See
46  * Section 6.3.1 for details.
47  *
48  * V: The V-bit is the Map-Version present bit. When this bit is set to
49  * 1, the N-bit MUST be 0. Refer to Section 6.6.3 for more details.
50  *
51  * I: The I-bit is the Instance ID bit. See Section 5.5 for more
52  * details. When this bit is set to 1, the 'Locator-Status-Bits'
53  * field is reduced to 8 bits and the high-order 24 bits are used as
54  * an Instance ID. If the L-bit is set to 0, then the low-order
55  * 8 bits are transmitted as zero and ignored on receipt.
56  *
57  * P Bit: Flag bit 5 is defined as the Next Protocol bit. The P bit
58  * MUST be set to 1 to indicate the presence of the 8 bit next
59  * protocol field.
60  *
61  * P = 0 indicates that the payload MUST conform to LISP as defined
62  * in [RFC6830].
63  *
64  * Flag bit 5 was chosen as the P bit because this flag bit is
65  * currently unallocated in LISP [RFC6830].
66  *
67  * O: Flag bit 7 is defined as the O bit. When the O bit is set to 1, the
68  * packet is an OAM packet and OAM processing MUST occur. The OAM
69  * protocol details are out of scope for this document. As with the
70  * P-bit, bit 7 is currently a reserved flag in [RFC6830].
71  *
72  * Next Protocol Field: The lower 8 bits of the first word are used to
73  * carry a next protocol. This next protocol field contains the
74  * protocol of the encapsulated payload packet.
75  *
76  * LISP [RFC6830] uses the lower 16 bits of the first word for either
77  * a nonce, an echo-nonce ([RFC6830]) or to support map-versioning
78  * ([RFC6834]). These are all optional capabilities that are
79  * indicated by setting the N, E, and the V bit respectively.
80  *
81  * To maintain the desired data plane compatibility, when the P bit
82  * is set, the N, E, and V bits MUST be set to zero.
83  *
84  * A new protocol registry will be requested from IANA for the Next
85  * Protocol field. This draft defines the following Next Protocol
86  * values:
87  *
88  * 0x1 : IPv4
89  * 0x2 : IPv6
90  * 0x3 : Ethernet
91  * 0x4: Network Service Header
92  */
93 
94 typedef struct {
101 
102 #define foreach_lisp_gpe_flag_bit \
103 _(N, 0x80) \
104 _(L, 0x40) \
105 _(E, 0x20) \
106 _(V, 0x10) \
107 _(I, 0x08) \
108 _(P, 0x04) \
109 _(O, 0x01)
110 
111 typedef enum {
112 #define _(n,v) LISP_GPE_FLAGS_##n = v,
114 #undef _
116 
117 #define LISP_GPE_VERSION 0x0
118 
119 #define LISP_GPE_NEXT_PROTOCOL_IP4 0x1
120 #define LISP_GPE_NEXT_PROTOCOL_IP6 0x2
121 #define LISP_GPE_NEXT_PROTOCOL_ETHERNET 0x3
122 #define LISP_GPE_NEXT_PROTOCOL_NSH 0x4
123 
124 typedef enum
125 {
132 
133 #endif /* included_lisp_gpe_packet_h */
vnet_lisp_gpe_flag_bit_t
#define foreach_lisp_gpe_flag_bit
unsigned int u32
Definition: types.h:88
unsigned char u8
Definition: types.h:56
lisp_gpe_next_protocol_e