9ee11f0fff
Implement support for processing the IOAM Pre-allocated Trace with IPv6, see [1] and [2]. Introduce a new IPv6 Hop-by-Hop TLV option, see IANA [3]. A new per-interface sysctl is introduced. The value is a boolean to accept (=1) or ignore (=0, by default) IPv6 IOAM options on ingress for an interface: - net.ipv6.conf.XXX.ioam6_enabled Two other sysctls are introduced to define IOAM IDs, represented by an integer. They are respectively per-namespace and per-interface: - net.ipv6.ioam6_id - net.ipv6.conf.XXX.ioam6_id The value of the first one represents the IOAM ID of the node itself (u32; max and default value = U32_MAX>>8, due to hop limit concatenation) while the other represents the IOAM ID of an interface (u16; max and default value = U16_MAX). Each "ioam6_id" sysctl has a "_wide" equivalent: - net.ipv6.ioam6_id_wide - net.ipv6.conf.XXX.ioam6_id_wide The value of the first one represents the wide IOAM ID of the node itself (u64; max and default value = U64_MAX>>8, due to hop limit concatenation) while the other represents the wide IOAM ID of an interface (u32; max and default value = U32_MAX). The use of short and wide equivalents is not exclusive, a deployment could choose to leverage both. For example, net.ipv6.conf.XXX.ioam6_id (short format) could be an identifier for a physical interface, whereas net.ipv6.conf.XXX.ioam6_id_wide (wide format) could be an identifier for a logical sub-interface. Documentation about new sysctls is provided at the end of this patchset. Two relativistic hash tables are used: one for IOAM namespaces, the other for IOAM schemas. A namespace can only have a single active schema and a schema can only be attached to a single namespace (1:1 relationship). [1] https://tools.ietf.org/html/draft-ietf-ippm-ioam-ipv6-options [2] https://tools.ietf.org/html/draft-ietf-ippm-ioam-data [3] https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters-2 Signed-off-by: Justin Iurman <justin.iurman@uliege.be> Signed-off-by: David S. Miller <davem@davemloft.net>
133 lines
2.3 KiB
C
133 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* IPv6 IOAM implementation
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*
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* Author:
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* Justin Iurman <justin.iurman@uliege.be>
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*/
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#ifndef _UAPI_LINUX_IOAM6_H
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#define _UAPI_LINUX_IOAM6_H
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#include <asm/byteorder.h>
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#include <linux/types.h>
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#define IOAM6_U16_UNAVAILABLE U16_MAX
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#define IOAM6_U32_UNAVAILABLE U32_MAX
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#define IOAM6_U64_UNAVAILABLE U64_MAX
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#define IOAM6_DEFAULT_ID (IOAM6_U32_UNAVAILABLE >> 8)
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#define IOAM6_DEFAULT_ID_WIDE (IOAM6_U64_UNAVAILABLE >> 8)
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#define IOAM6_DEFAULT_IF_ID IOAM6_U16_UNAVAILABLE
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#define IOAM6_DEFAULT_IF_ID_WIDE IOAM6_U32_UNAVAILABLE
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/*
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* IPv6 IOAM Option Header
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*/
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struct ioam6_hdr {
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__u8 opt_type;
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__u8 opt_len;
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__u8 :8; /* reserved */
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#define IOAM6_TYPE_PREALLOC 0
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__u8 type;
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} __attribute__((packed));
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/*
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* IOAM Trace Header
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*/
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struct ioam6_trace_hdr {
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__be16 namespace_id;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 :1, /* unused */
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:1, /* unused */
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overflow:1,
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nodelen:5;
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__u8 remlen:7,
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:1; /* unused */
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union {
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__be32 type_be32;
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struct {
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__u32 bit7:1,
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bit6:1,
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bit5:1,
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bit4:1,
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bit3:1,
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bit2:1,
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bit1:1,
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bit0:1,
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bit15:1, /* unused */
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bit14:1, /* unused */
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bit13:1, /* unused */
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bit12:1, /* unused */
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bit11:1,
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bit10:1,
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bit9:1,
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bit8:1,
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bit23:1, /* reserved */
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bit22:1,
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bit21:1, /* unused */
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bit20:1, /* unused */
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bit19:1, /* unused */
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bit18:1, /* unused */
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bit17:1, /* unused */
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bit16:1, /* unused */
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:8; /* reserved */
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} type;
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};
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 nodelen:5,
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overflow:1,
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:1, /* unused */
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:1; /* unused */
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__u8 :1, /* unused */
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remlen:7;
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union {
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__be32 type_be32;
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struct {
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__u32 bit0:1,
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bit1:1,
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bit2:1,
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bit3:1,
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bit4:1,
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bit5:1,
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bit6:1,
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bit7:1,
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bit8:1,
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bit9:1,
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bit10:1,
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bit11:1,
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bit12:1, /* unused */
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bit13:1, /* unused */
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bit14:1, /* unused */
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bit15:1, /* unused */
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bit16:1, /* unused */
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bit17:1, /* unused */
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bit18:1, /* unused */
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bit19:1, /* unused */
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bit20:1, /* unused */
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bit21:1, /* unused */
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bit22:1,
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bit23:1, /* reserved */
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:8; /* reserved */
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} type;
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};
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 data[0];
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} __attribute__((packed));
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#endif /* _UAPI_LINUX_IOAM6_H */
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