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 [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 Justin Iurman (5): uapi: IPv6 IOAM headers definition ipv6: ioam: Data plane support for Pre-allocated Trace ipv6: ioam: IOAM Generic Netlink API ipv6: ioam: Support for IOAM injection with lwtunnels ipv6: ioam: Documentation for new IOAM sysctls Documentation/networking/ioam6-sysctl.rst | 20 + Documentation/networking/ip-sysctl.rst | 5 + include/linux/ioam6.h | 13 + include/linux/ioam6_genl.h | 13 + include/linux/ioam6_iptunnel.h | 13 + include/linux/ipv6.h | 2 + include/net/ioam6.h | 65 ++ include/net/netns/ipv6.h | 2 + include/uapi/linux/in6.h | 1 + include/uapi/linux/ioam6.h | 124 +++ include/uapi/linux/ioam6_genl.h | 49 ++ include/uapi/linux/ioam6_iptunnel.h | 19 + include/uapi/linux/ipv6.h | 2 + include/uapi/linux/lwtunnel.h | 1 + net/core/lwtunnel.c | 2 + net/ipv6/Kconfig | 11 + net/ipv6/Makefile | 3 +- net/ipv6/addrconf.c | 20 + net/ipv6/af_inet6.c | 7 + net/ipv6/exthdrs.c | 51 ++ net/ipv6/ioam6.c | 872 ++++++++++++++++++++++ net/ipv6/ioam6_iptunnel.c | 273 +++++++ net/ipv6/sysctl_net_ipv6.c | 7 + 23 files changed, 1574 insertions(+), 1 deletion(-) create mode 100644 Documentation/networking/ioam6-sysctl.rst create mode 100644 include/linux/ioam6.h create mode 100644 include/linux/ioam6_genl.h create mode 100644 include/linux/ioam6_iptunnel.h create mode 100644 include/net/ioam6.h create mode 100644 include/uapi/linux/ioam6.h create mode 100644 include/uapi/linux/ioam6_genl.h create mode 100644 include/uapi/linux/ioam6_iptunnel.h create mode 100644 net/ipv6/ioam6.c create mode 100644 net/ipv6/ioam6_iptunnel.c -- 2.17.1
