| /* |
| * Copyright (c) 2016 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. |
| */ |
| /** |
| * @file |
| * @brief LISP-GPE packet header structure |
| * |
| */ |
| |
| #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 |
| */ |
| |
| /** LISP-GPE 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 |
| |
| typedef enum |
| { |
| LISP_GPE_NEXT_PROTO_IP4 = 1, |
| LISP_GPE_NEXT_PROTO_IP6, |
| LISP_GPE_NEXT_PROTO_ETHERNET, |
| LISP_GPE_NEXT_PROTO_NSH, |
| LISP_GPE_NEXT_PROTOS |
| } lisp_gpe_next_protocol_e; |
| |
| #endif /* included_lisp_gpe_packet_h */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |