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userspace: Add support for NSH MD1 match fields
This patch adds support for NSH packet header fields to the OVS control plane and the userspace datapath. Initially we support the fields of the NSH base header as defined in https://www.ietf.org/id/draft-ietf-sfc-nsh-13.txt and the fixed context headers specified for metadata format MD1. The variable length MD2 format is parsed but the TLV context headers are not yet available for matching. The NSH fields are modelled as experimenter fields with the dedicated experimenter class 0x005ad650 proposed for NSH in ONF. The following fields are defined: NXOXM code ofctl name Size Comment ===================================================================== NXOXM_NSH_FLAGS nsh_flags 8 Bits 2-9 of 1st NSH word (0x005ad650,1) NXOXM_NSH_MDTYPE nsh_mdtype 8 Bits 16-23 (0x005ad650,2) NXOXM_NSH_NEXTPROTO nsh_np 8 Bits 24-31 (0x005ad650,3) NXOXM_NSH_SPI nsh_spi 24 Bits 0-23 of 2nd NSH word (0x005ad650,4) NXOXM_NSH_SI nsh_si 8 Bits 24-31 (0x005ad650,5) NXOXM_NSH_C1 nsh_c1 32 Maskable, nsh_mdtype==1 (0x005ad650,6) NXOXM_NSH_C2 nsh_c2 32 Maskable, nsh_mdtype==1 (0x005ad650,7) NXOXM_NSH_C3 nsh_c3 32 Maskable, nsh_mdtype==1 (0x005ad650,8) NXOXM_NSH_C4 nsh_c4 32 Maskable, nsh_mdtype==1 (0x005ad650,9) Co-authored-by: Johnson Li <johnson.li@intel.com> Signed-off-by: Yi Yang <yi.y.yang@intel.com> Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com> Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Jan Scheurich
Ben Pfaff
135
include/openvswitch/nsh.h
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135
include/openvswitch/nsh.h
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#ifndef __OPENVSWITCH_NSH_H
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#define __OPENVSWITCH_NSH_H 1
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#include "openvswitch/types.h"
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/*
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* Network Service Header:
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Ver|O|C|R|R|R|R|R|R| Length | MD Type | Next Proto |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Service Path ID | Service Index |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* ~ Mandatory/Optional Context Header ~
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* Ver = The version field is used to ensure backward compatibility
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* going forward with future NSH updates. It MUST be set to 0x0
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* by the sender, in this first revision of NSH.
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*
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* O = OAM. when set to 0x1 indicates that this packet is an operations
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* and management (OAM) packet. The receiving SFF and SFs nodes
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* MUST examine the payload and take appropriate action.
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*
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* C = context. Indicates that a critical metadata TLV is present.
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*
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* Length : total length, in 4-byte words, of NSH including the Base
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* Header, the Service Path Header and the optional variable
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* TLVs.
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* MD Type: indicates the format of NSH beyond the mandatory Base Header
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* and the Service Path Header.
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*
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* Next Protocol: indicates the protocol type of the original packet. A
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* new IANA registry will be created for protocol type.
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*
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* Service Path Identifier (SPI): identifies a service path.
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* Participating nodes MUST use this identifier for Service
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* Function Path selection.
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*
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* Service Index (SI): provides location within the SFP.
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*
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* [0] https://tools.ietf.org/html/draft-ietf-sfc-nsh-13
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* struct nsh_md1_ctx - Keeps track of NSH context data
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* @nshc<1-4>: NSH Contexts.
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*/
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struct nsh_md1_ctx {
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ovs_16aligned_be32 c[4];
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};
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struct nsh_md2_tlv {
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ovs_be16 md_class;
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uint8_t type;
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uint8_t length;
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uint8_t md_value[];
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};
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struct nsh_hdr {
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ovs_be16 ver_flags_len;
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uint8_t md_type;
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uint8_t next_proto;
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ovs_16aligned_be32 path_hdr;
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union {
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struct nsh_md1_ctx md1;
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struct nsh_md2_tlv md2[0];
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};
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};
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/* Masking NSH header fields. */
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#define NSH_VER_MASK 0xc000
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#define NSH_VER_SHIFT 14
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#define NSH_FLAGS_MASK 0x3fc0
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#define NSH_FLAGS_SHIFT 6
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#define NSH_LEN_MASK 0x003f
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#define NSH_LEN_SHIFT 0
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#define NSH_SPI_MASK 0xffffff00
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#define NSH_SPI_SHIFT 8
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#define NSH_SI_MASK 0x000000ff
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#define NSH_SI_SHIFT 0
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#define NSH_DST_PORT 4790 /* UDP Port for NSH on VXLAN. */
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#define ETH_P_NSH 0x894F /* Ethertype for NSH. */
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/* NSH Base Header Next Protocol. */
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#define NSH_P_IPV4 0x01
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#define NSH_P_IPV6 0x02
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#define NSH_P_ETHERNET 0x03
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#define NSH_P_NSH 0x04
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#define NSH_P_MPLS 0x05
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/* MD Type Registry. */
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#define NSH_M_TYPE1 0x01
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#define NSH_M_TYPE2 0x02
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#define NSH_M_EXP1 0xFE
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#define NSH_M_EXP2 0xFF
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/* NSH Metadata Length. */
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#define NSH_M_TYPE1_MDLEN 16
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/* NSH Base Header Length */
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#define NSH_BASE_HDR_LEN 8
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/* NSH MD Type 1 header Length. */
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#define NSH_M_TYPE1_LEN 24
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static inline uint16_t
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nsh_hdr_len(const struct nsh_hdr *nsh)
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{
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return 4 * (ntohs(nsh->ver_flags_len) & NSH_LEN_MASK) >> NSH_LEN_SHIFT;
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}
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static inline struct nsh_md1_ctx *
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nsh_md1_ctx(struct nsh_hdr *nsh)
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{
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return &nsh->md1;
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}
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static inline struct nsh_md2_tlv *
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nsh_md2_ctx(struct nsh_hdr *nsh)
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{
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return nsh->md2;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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