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/*
* Copyright (c) 2015 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_lisp_gpe_packet_h
#define included_lisp_gpe_packet_h
/*
* From draft-lewis-lisp-gpe-02.txt
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |N|L|E|V|I|P|R|O|Ver| Reserved | Next Protocol |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Instance ID/Locator-Status-Bits |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* N: The N-bit is the nonce-present bit. When this bit is set to 1,
* the low-order 24 bits of the first 32 bits of the LISP header
* contain a Nonce. See Section 6.3.1 for details. Both N- and
* V-bits MUST NOT be set in the same packet. If they are, a
* decapsulating ETR MUST treat the 'Nonce/Map-Version' field as
* having a Nonce value present.
*
* L: The L-bit is the 'Locator-Status-Bits' field enabled bit. When
* this bit is set to 1, the Locator-Status-Bits in the second
* 32 bits of the LISP header are in use.
*
* E: The E-bit is the echo-nonce-request bit. This bit MUST be ignored
* and has no meaning when the N-bit is set to 0. When the N-bit is
* set to 1 and this bit is set to 1, an ITR is requesting that the
* nonce value in the 'Nonce' field be echoed back in LISP-
* encapsulated packets when the ITR is also an ETR. See
* Section 6.3.1 for details.
*
* V: The V-bit is the Map-Version present bit. When this bit is set to
* 1, the N-bit MUST be 0. Refer to Section 6.6.3 for more details.
*
* I: The I-bit is the Instance ID bit. See Section 5.5 for more
* details. When this bit is set to 1, the 'Locator-Status-Bits'
* field is reduced to 8 bits and the high-order 24 bits are used as
* an Instance ID. If the L-bit is set to 0, then the low-order
* 8 bits are transmitted as zero and ignored on receipt.
*
* P Bit: Flag bit 5 is defined as the Next Protocol bit. The P bit
* MUST be set to 1 to indicate the presence of the 8 bit next
* protocol field.
*
* P = 0 indicates that the payload MUST conform to LISP as defined
* in [RFC6830].
*
* Flag bit 5 was chosen as the P bit because this flag bit is
* currently unallocated in LISP [RFC6830].
*
* O: Flag bit 7 is defined as the O bit. When the O bit is set to 1, the
* packet is an OAM packet and OAM processing MUST occur. The OAM
* protocol details are out of scope for this document. As with the
* P-bit, bit 7 is currently a reserved flag in [RFC6830].
*
* Next Protocol Field: The lower 8 bits of the first word are used to
* carry a next protocol. This next protocol field contains the
* protocol of the encapsulated payload packet.
*
* LISP [RFC6830] uses the lower 16 bits of the first word for either
* a nonce, an echo-nonce ([RFC6830]) or to support map-versioning
* ([RFC6834]). These are all optional capabilities that are
* indicated by setting the N, E, and the V bit respectively.
*
* To maintain the desired data plane compatibility, when the P bit
* is set, the N, E, and V bits MUST be set to zero.
*
* A new protocol registry will be requested from IANA for the Next
* Protocol field. This draft defines the following Next Protocol
* values:
*
* 0x1 : IPv4
* 0x2 : IPv6
* 0x3 : Ethernet
* 0x4: Network Service Header
*/
typedef struct {
u8 flags;
u8 ver_res;
u8 res;
u8 next_protocol;
u32 iid;
} lisp_gpe_header_t;
#define foreach_lisp_gpe_flag_bit \
_(N, 0x80) \
_(L, 0x40) \
_(E, 0x20) \
_(V, 0x10) \
_(I, 0x08) \
_(P, 0x04) \
_(O, 0x01)
typedef enum {
#define _(n,v) LISP_GPE_FLAGS_##n = v,
foreach_lisp_gpe_flag_bit
#undef _
} vnet_lisp_gpe_flag_bit_t;
#define LISP_GPE_VERSION 0x0
#define LISP_GPE_NEXT_PROTOCOL_IP4 0x1
#define LISP_GPE_NEXT_PROTOCOL_IP6 0x2
#define LISP_GPE_NEXT_PROTOCOL_ETHERNET 0x3
#define LISP_GPE_NEXT_PROTOCOL_NSH 0x4
#endif /* included_lisp_gpe_packet_h */
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