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Merge branch 'ipv6-ioam'
Justin Iurman says: ==================== Support for the IOAM Pre-allocated Trace with IPv6 v5: - Refine types, min/max and default values for new sysctls - Introduce a "_wide" sysctl for each "ioam6_id" sysctl - Add more validation on headers before processing data - RCU for sc <> ns pointers + appropriate accessors - Generic Netlink policies are now per op, not per family anymore - Address other comments/remarks from Jakub (thanks again) - Revert "__packed" to "__attribute__((packed))" for uapi headers - Add tests to cover the functionality added, as requested by David Ahern v4: - Address warnings from checkpatch (ignore errors related to unnamed bitfields in the first patch) - Use of hweight32 (thanks Jakub) - Remove inline keyword from static functions in C files and let the compiler decide what to do (thanks Jakub) v3: - Fix warning "unused label 'out_unregister_genl'" by adding conditional macro - Fix lwtunnel output redirect bug: dst cache useless in this case, use orig_output instead v2: - Fix warning with static for __ioam6_fill_trace_data - Fix sparse warning with __force when casting __be64 to __be32 - Fix unchecked dereference when removing IOAM namespaces or schemas - exthdrs.c: Don't drop by default (now: ignore) to match the act bits "00" - Add control plane support for the inline insertion (lwtunnel) - Provide uapi structures - Use __net_timestamp if skb->tstamp is empty - Add note about the temporary IANA allocation - Remove support for "removable" TLVs - Remove support for virtual/anonymous tunnel decapsulation In-situ Operations, Administration, and Maintenance (IOAM) records operational and telemetry information in a packet while it traverses a path between two points in an IOAM domain. It is defined in draft-ietf-ippm-ioam-data [1]. IOAM data fields can be encapsulated into a variety of protocols. The IPv6 encapsulation is defined in draft-ietf-ippm-ioam-ipv6-options [2], via extension headers. IOAM can be used to complement OAM mechanisms based on e.g. ICMP or other types of probe packets. This patchset implements support for the Pre-allocated Trace, carried by a Hop-by-Hop. Therefore, a new IPv6 Hop-by-Hop TLV option is introduced, see IANA [3]. The three other IOAM options are not included in this patchset (Incremental Trace, Proof-of-Transit and Edge-to-Edge). The main idea behind the IOAM Pre-allocated Trace is that a node pre-allocates some room in packets for IOAM data. Then, each IOAM node on the path will insert its data. There exist several interesting use- cases, e.g. Fast failure detection/isolation or Smart service selection. Another killer use-case is what we have called Cross-Layer Telemetry, see the demo video on its repository [4], that aims to make the entire stack (L2/L3 -> L7) visible for distributed tracing tools (e.g. Jaeger), instead of the current L5 -> L7 limited view. So, basically, this is a nice feature for the Linux Kernel. This patchset also provides support for the control plane part, but only for the inline insertion (host-to-host use case), through lightweight tunnels. Indeed, for in-transit traffic, the solution is to have an IPv6-in-IPv6 encapsulation, which brings some difficulties and still requires a little bit of work and discussion (ie anonymous tunnel decapsulation and multi egress resolution). - Patch 1: IPv6 IOAM headers definition - Patch 2: Data plane support for Pre-allocated Trace - Patch 3: IOAM Generic Netlink API - Patch 4: Support for IOAM injection with lwtunnels - Patch 5: Documentation for new IOAM sysctls - Patch 6: Test for the IOAM insertion with IPv6 [1] https://tools.ietf.org/html/draft-ietf-ippm-ioam-data [2] https://tools.ietf.org/html/draft-ietf-ippm-ioam-ipv6-options [3] https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters-2 [4] https://github.com/iurmanj/cross-layer-telemetry ==================== Signed-off-by: David S. Miller <[email protected]>
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‎Documentation/networking/ioam6-sysctl.rst

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.. SPDX-License-Identifier: GPL-2.0
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=====================
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IOAM6 Sysfs variables
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=====================
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/proc/sys/net/conf/<iface>/ioam6_* variables:
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=============================================
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ioam6_enabled - BOOL
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Accept (= enabled) or ignore (= disabled) IPv6 IOAM options on ingress
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for this interface.
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* 0 - disabled (default)
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* 1 - enabled
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ioam6_id - SHORT INTEGER
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Define the IOAM id of this interface.
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Default is ~0.
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ioam6_id_wide - INTEGER
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Define the wide IOAM id of this interface.
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Default is ~0.

‎Documentation/networking/ip-sysctl.rst

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@@ -1926,6 +1926,23 @@ fib_notify_on_flag_change - INTEGER
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- 1 - Emit notifications.
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- 2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change.
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ioam6_id - INTEGER
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Define the IOAM id of this node. Uses only 24 bits out of 32 in total.
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Min: 0
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Max: 0xFFFFFF
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Default: 0xFFFFFF
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ioam6_id_wide - LONG INTEGER
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Define the wide IOAM id of this node. Uses only 56 bits out of 64 in
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total. Can be different from ioam6_id.
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Min: 0
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Max: 0xFFFFFFFFFFFFFF
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Default: 0xFFFFFFFFFFFFFF
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IPv6 Fragmentation:
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ip6frag_high_thresh - INTEGER

‎include/linux/ioam6.h

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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* IPv6 IOAM
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*
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* Author:
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* Justin Iurman <[email protected]>
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*/
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#ifndef _LINUX_IOAM6_H
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#define _LINUX_IOAM6_H
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#include <uapi/linux/ioam6.h>
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#endif /* _LINUX_IOAM6_H */

‎include/linux/ioam6_genl.h

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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* IPv6 IOAM Generic Netlink API
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*
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* Author:
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* Justin Iurman <[email protected]>
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*/
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#ifndef _LINUX_IOAM6_GENL_H
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#define _LINUX_IOAM6_GENL_H
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#include <uapi/linux/ioam6_genl.h>
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#endif /* _LINUX_IOAM6_GENL_H */

‎include/linux/ioam6_iptunnel.h

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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* IPv6 IOAM Lightweight Tunnel API
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*
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* Author:
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* Justin Iurman <[email protected]>
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*/
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#ifndef _LINUX_IOAM6_IPTUNNEL_H
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#define _LINUX_IOAM6_IPTUNNEL_H
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#include <uapi/linux/ioam6_iptunnel.h>
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#endif /* _LINUX_IOAM6_IPTUNNEL_H */

‎include/linux/ipv6.h

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@@ -76,6 +76,9 @@ struct ipv6_devconf {
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__s32 disable_policy;
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__s32 ndisc_tclass;
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__s32 rpl_seg_enabled;
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__u32 ioam6_id;
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__u32 ioam6_id_wide;
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__u8 ioam6_enabled;
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struct ctl_table_header *sysctl_header;
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};

‎include/net/ioam6.h

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/* SPDX-License-Identifier: GPL-2.0+ */
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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 <[email protected]>
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*/
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#ifndef _NET_IOAM6_H
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#define _NET_IOAM6_H
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/ioam6.h>
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#include <linux/rhashtable-types.h>
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struct ioam6_namespace {
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struct rhash_head head;
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struct rcu_head rcu;
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struct ioam6_schema __rcu *schema;
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__be16 id;
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__be32 data;
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__be64 data_wide;
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};
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struct ioam6_schema {
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struct rhash_head head;
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struct rcu_head rcu;
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struct ioam6_namespace __rcu *ns;
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u32 id;
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int len;
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__be32 hdr;
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u8 data[0];
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};
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struct ioam6_pernet_data {
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struct mutex lock;
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struct rhashtable namespaces;
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struct rhashtable schemas;
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};
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static inline struct ioam6_pernet_data *ioam6_pernet(struct net *net)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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return net->ipv6.ioam6_data;
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#else
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return NULL;
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#endif
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}
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struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id);
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void ioam6_fill_trace_data(struct sk_buff *skb,
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struct ioam6_namespace *ns,
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struct ioam6_trace_hdr *trace);
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int ioam6_init(void);
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void ioam6_exit(void);
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int ioam6_iptunnel_init(void);
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void ioam6_iptunnel_exit(void);
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#endif /* _NET_IOAM6_H */

‎include/net/netns/ipv6.h

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@@ -51,6 +51,8 @@ struct netns_sysctl_ipv6 {
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int max_dst_opts_len;
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int max_hbh_opts_len;
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int seg6_flowlabel;
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u32 ioam6_id;
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u64 ioam6_id_wide;
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bool skip_notify_on_dev_down;
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u8 fib_notify_on_flag_change;
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};
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spinlock_t lock;
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u32 seq;
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} ip6addrlbl_table;
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struct ioam6_pernet_data *ioam6_data;
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};
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#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)

‎include/uapi/linux/in6.h

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#define IPV6_TLV_PADN 1
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#define IPV6_TLV_ROUTERALERT 5
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#define IPV6_TLV_CALIPSO 7 /* RFC 5570 */
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#define IPV6_TLV_IOAM 49 /* TEMPORARY IANA allocation for IOAM */
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#define IPV6_TLV_JUMBO 194
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#define IPV6_TLV_HAO 201 /* home address option */
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‎include/uapi/linux/ioam6.h

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/* 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 <[email protected]>
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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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#define IOAM6_TRACE_DATA_SIZE_MAX 244
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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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