Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 476 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/test_lwt_ip_encap.sh b/tools/testing/selftests/bpf/test_lwt_ip_encap.sh
new file mode 100755
index 000000000..1e565f47a
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_lwt_ip_encap.sh
@@ -0,0 +1,476 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Setup/topology:
+#
+#    NS1             NS2             NS3
+#   veth1 <---> veth2   veth3 <---> veth4 (the top route)
+#   veth5 <---> veth6   veth7 <---> veth8 (the bottom route)
+#
+#   each vethN gets IPv[4|6]_N address
+#
+#   IPv*_SRC = IPv*_1
+#   IPv*_DST = IPv*_4
+#
+#   all tests test pings from IPv*_SRC to IPv*_DST
+#
+#   by default, routes are configured to allow packets to go
+#   IP*_1 <=> IP*_2 <=> IP*_3 <=> IP*_4 (the top route)
+#
+#   a GRE device is installed in NS3 with IPv*_GRE, and
+#   NS1/NS2 are configured to route packets to IPv*_GRE via IP*_8
+#   (the bottom route)
+#
+# Tests:
+#
+#   1. routes NS2->IPv*_DST are brought down, so the only way a ping
+#      from IP*_SRC to IP*_DST can work is via IPv*_GRE
+#
+#   2a. in an egress test, a bpf LWT_XMIT program is installed on veth1
+#       that encaps the packets with an IP/GRE header to route to IPv*_GRE
+#
+#       ping: SRC->[encap at veth1:egress]->GRE:decap->DST
+#       ping replies go DST->SRC directly
+#
+#   2b. in an ingress test, a bpf LWT_IN program is installed on veth2
+#       that encaps the packets with an IP/GRE header to route to IPv*_GRE
+#
+#       ping: SRC->[encap at veth2:ingress]->GRE:decap->DST
+#       ping replies go DST->SRC directly
+
+BPF_FILE="test_lwt_ip_encap.bpf.o"
+if [[ $EUID -ne 0 ]]; then
+	echo "This script must be run as root"
+	echo "FAIL"
+	exit 1
+fi
+
+readonly NS1="ns1-$(mktemp -u XXXXXX)"
+readonly NS2="ns2-$(mktemp -u XXXXXX)"
+readonly NS3="ns3-$(mktemp -u XXXXXX)"
+
+readonly IPv4_1="172.16.1.100"
+readonly IPv4_2="172.16.2.100"
+readonly IPv4_3="172.16.3.100"
+readonly IPv4_4="172.16.4.100"
+readonly IPv4_5="172.16.5.100"
+readonly IPv4_6="172.16.6.100"
+readonly IPv4_7="172.16.7.100"
+readonly IPv4_8="172.16.8.100"
+readonly IPv4_GRE="172.16.16.100"
+
+readonly IPv4_SRC=$IPv4_1
+readonly IPv4_DST=$IPv4_4
+
+readonly IPv6_1="fb01::1"
+readonly IPv6_2="fb02::1"
+readonly IPv6_3="fb03::1"
+readonly IPv6_4="fb04::1"
+readonly IPv6_5="fb05::1"
+readonly IPv6_6="fb06::1"
+readonly IPv6_7="fb07::1"
+readonly IPv6_8="fb08::1"
+readonly IPv6_GRE="fb10::1"
+
+readonly IPv6_SRC=$IPv6_1
+readonly IPv6_DST=$IPv6_4
+
+TEST_STATUS=0
+TESTS_SUCCEEDED=0
+TESTS_FAILED=0
+
+TMPFILE=""
+
+process_test_results()
+{
+	if [[ "${TEST_STATUS}" -eq 0 ]] ; then
+		echo "PASS"
+		TESTS_SUCCEEDED=$((TESTS_SUCCEEDED+1))
+	else
+		echo "FAIL"
+		TESTS_FAILED=$((TESTS_FAILED+1))
+	fi
+}
+
+print_test_summary_and_exit()
+{
+	echo "passed tests: ${TESTS_SUCCEEDED}"
+	echo "failed tests: ${TESTS_FAILED}"
+	if [ "${TESTS_FAILED}" -eq "0" ] ; then
+		exit 0
+	else
+		exit 1
+	fi
+}
+
+setup()
+{
+	set -e  # exit on error
+	TEST_STATUS=0
+
+	# create devices and namespaces
+	ip netns add "${NS1}"
+	ip netns add "${NS2}"
+	ip netns add "${NS3}"
+
+	# rp_filter gets confused by what these tests are doing, so disable it
+	ip netns exec ${NS1} sysctl -wq net.ipv4.conf.all.rp_filter=0
+	ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
+	ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
+	ip netns exec ${NS1} sysctl -wq net.ipv4.conf.default.rp_filter=0
+	ip netns exec ${NS2} sysctl -wq net.ipv4.conf.default.rp_filter=0
+	ip netns exec ${NS3} sysctl -wq net.ipv4.conf.default.rp_filter=0
+
+	# disable IPv6 DAD because it sometimes takes too long and fails tests
+	ip netns exec ${NS1} sysctl -wq net.ipv6.conf.all.accept_dad=0
+	ip netns exec ${NS2} sysctl -wq net.ipv6.conf.all.accept_dad=0
+	ip netns exec ${NS3} sysctl -wq net.ipv6.conf.all.accept_dad=0
+	ip netns exec ${NS1} sysctl -wq net.ipv6.conf.default.accept_dad=0
+	ip netns exec ${NS2} sysctl -wq net.ipv6.conf.default.accept_dad=0
+	ip netns exec ${NS3} sysctl -wq net.ipv6.conf.default.accept_dad=0
+
+	ip link add veth1 type veth peer name veth2
+	ip link add veth3 type veth peer name veth4
+	ip link add veth5 type veth peer name veth6
+	ip link add veth7 type veth peer name veth8
+
+	ip netns exec ${NS2} sysctl -wq net.ipv4.ip_forward=1
+	ip netns exec ${NS2} sysctl -wq net.ipv6.conf.all.forwarding=1
+
+	ip link set veth1 netns ${NS1}
+	ip link set veth2 netns ${NS2}
+	ip link set veth3 netns ${NS2}
+	ip link set veth4 netns ${NS3}
+	ip link set veth5 netns ${NS1}
+	ip link set veth6 netns ${NS2}
+	ip link set veth7 netns ${NS2}
+	ip link set veth8 netns ${NS3}
+
+	if [ ! -z "${VRF}" ] ; then
+		ip -netns ${NS1} link add red type vrf table 1001
+		ip -netns ${NS1} link set red up
+		ip -netns ${NS1} route add table 1001 unreachable default metric 8192
+		ip -netns ${NS1} -6 route add table 1001 unreachable default metric 8192
+		ip -netns ${NS1} link set veth1 vrf red
+		ip -netns ${NS1} link set veth5 vrf red
+
+		ip -netns ${NS2} link add red type vrf table 1001
+		ip -netns ${NS2} link set red up
+		ip -netns ${NS2} route add table 1001 unreachable default metric 8192
+		ip -netns ${NS2} -6 route add table 1001 unreachable default metric 8192
+		ip -netns ${NS2} link set veth2 vrf red
+		ip -netns ${NS2} link set veth3 vrf red
+		ip -netns ${NS2} link set veth6 vrf red
+		ip -netns ${NS2} link set veth7 vrf red
+	fi
+
+	# configure addesses: the top route (1-2-3-4)
+	ip -netns ${NS1}    addr add ${IPv4_1}/24  dev veth1
+	ip -netns ${NS2}    addr add ${IPv4_2}/24  dev veth2
+	ip -netns ${NS2}    addr add ${IPv4_3}/24  dev veth3
+	ip -netns ${NS3}    addr add ${IPv4_4}/24  dev veth4
+	ip -netns ${NS1} -6 addr add ${IPv6_1}/128 nodad dev veth1
+	ip -netns ${NS2} -6 addr add ${IPv6_2}/128 nodad dev veth2
+	ip -netns ${NS2} -6 addr add ${IPv6_3}/128 nodad dev veth3
+	ip -netns ${NS3} -6 addr add ${IPv6_4}/128 nodad dev veth4
+
+	# configure addresses: the bottom route (5-6-7-8)
+	ip -netns ${NS1}    addr add ${IPv4_5}/24  dev veth5
+	ip -netns ${NS2}    addr add ${IPv4_6}/24  dev veth6
+	ip -netns ${NS2}    addr add ${IPv4_7}/24  dev veth7
+	ip -netns ${NS3}    addr add ${IPv4_8}/24  dev veth8
+	ip -netns ${NS1} -6 addr add ${IPv6_5}/128 nodad dev veth5
+	ip -netns ${NS2} -6 addr add ${IPv6_6}/128 nodad dev veth6
+	ip -netns ${NS2} -6 addr add ${IPv6_7}/128 nodad dev veth7
+	ip -netns ${NS3} -6 addr add ${IPv6_8}/128 nodad dev veth8
+
+	ip -netns ${NS1} link set dev veth1 up
+	ip -netns ${NS2} link set dev veth2 up
+	ip -netns ${NS2} link set dev veth3 up
+	ip -netns ${NS3} link set dev veth4 up
+	ip -netns ${NS1} link set dev veth5 up
+	ip -netns ${NS2} link set dev veth6 up
+	ip -netns ${NS2} link set dev veth7 up
+	ip -netns ${NS3} link set dev veth8 up
+
+	# configure routes: IP*_SRC -> veth1/IP*_2 (= top route) default;
+	# the bottom route to specific bottom addresses
+
+	# NS1
+	# top route
+	ip -netns ${NS1}    route add ${IPv4_2}/32  dev veth1 ${VRF}
+	ip -netns ${NS1}    route add default dev veth1 via ${IPv4_2} ${VRF}  # go top by default
+	ip -netns ${NS1} -6 route add ${IPv6_2}/128 dev veth1 ${VRF}
+	ip -netns ${NS1} -6 route add default dev veth1 via ${IPv6_2} ${VRF}  # go top by default
+	# bottom route
+	ip -netns ${NS1}    route add ${IPv4_6}/32  dev veth5 ${VRF}
+	ip -netns ${NS1}    route add ${IPv4_7}/32  dev veth5 via ${IPv4_6} ${VRF}
+	ip -netns ${NS1}    route add ${IPv4_8}/32  dev veth5 via ${IPv4_6} ${VRF}
+	ip -netns ${NS1} -6 route add ${IPv6_6}/128 dev veth5 ${VRF}
+	ip -netns ${NS1} -6 route add ${IPv6_7}/128 dev veth5 via ${IPv6_6} ${VRF}
+	ip -netns ${NS1} -6 route add ${IPv6_8}/128 dev veth5 via ${IPv6_6} ${VRF}
+
+	# NS2
+	# top route
+	ip -netns ${NS2}    route add ${IPv4_1}/32  dev veth2 ${VRF}
+	ip -netns ${NS2}    route add ${IPv4_4}/32  dev veth3 ${VRF}
+	ip -netns ${NS2} -6 route add ${IPv6_1}/128 dev veth2 ${VRF}
+	ip -netns ${NS2} -6 route add ${IPv6_4}/128 dev veth3 ${VRF}
+	# bottom route
+	ip -netns ${NS2}    route add ${IPv4_5}/32  dev veth6 ${VRF}
+	ip -netns ${NS2}    route add ${IPv4_8}/32  dev veth7 ${VRF}
+	ip -netns ${NS2} -6 route add ${IPv6_5}/128 dev veth6 ${VRF}
+	ip -netns ${NS2} -6 route add ${IPv6_8}/128 dev veth7 ${VRF}
+
+	# NS3
+	# top route
+	ip -netns ${NS3}    route add ${IPv4_3}/32  dev veth4
+	ip -netns ${NS3}    route add ${IPv4_1}/32  dev veth4 via ${IPv4_3}
+	ip -netns ${NS3}    route add ${IPv4_2}/32  dev veth4 via ${IPv4_3}
+	ip -netns ${NS3} -6 route add ${IPv6_3}/128 dev veth4
+	ip -netns ${NS3} -6 route add ${IPv6_1}/128 dev veth4 via ${IPv6_3}
+	ip -netns ${NS3} -6 route add ${IPv6_2}/128 dev veth4 via ${IPv6_3}
+	# bottom route
+	ip -netns ${NS3}    route add ${IPv4_7}/32  dev veth8
+	ip -netns ${NS3}    route add ${IPv4_5}/32  dev veth8 via ${IPv4_7}
+	ip -netns ${NS3}    route add ${IPv4_6}/32  dev veth8 via ${IPv4_7}
+	ip -netns ${NS3} -6 route add ${IPv6_7}/128 dev veth8
+	ip -netns ${NS3} -6 route add ${IPv6_5}/128 dev veth8 via ${IPv6_7}
+	ip -netns ${NS3} -6 route add ${IPv6_6}/128 dev veth8 via ${IPv6_7}
+
+	# configure IPv4 GRE device in NS3, and a route to it via the "bottom" route
+	ip -netns ${NS3} tunnel add gre_dev mode gre remote ${IPv4_1} local ${IPv4_GRE} ttl 255
+	ip -netns ${NS3} link set gre_dev up
+	ip -netns ${NS3} addr add ${IPv4_GRE} dev gre_dev
+	ip -netns ${NS1} route add ${IPv4_GRE}/32 dev veth5 via ${IPv4_6} ${VRF}
+	ip -netns ${NS2} route add ${IPv4_GRE}/32 dev veth7 via ${IPv4_8} ${VRF}
+
+
+	# configure IPv6 GRE device in NS3, and a route to it via the "bottom" route
+	ip -netns ${NS3} -6 tunnel add name gre6_dev mode ip6gre remote ${IPv6_1} local ${IPv6_GRE} ttl 255
+	ip -netns ${NS3} link set gre6_dev up
+	ip -netns ${NS3} -6 addr add ${IPv6_GRE} nodad dev gre6_dev
+	ip -netns ${NS1} -6 route add ${IPv6_GRE}/128 dev veth5 via ${IPv6_6} ${VRF}
+	ip -netns ${NS2} -6 route add ${IPv6_GRE}/128 dev veth7 via ${IPv6_8} ${VRF}
+
+	TMPFILE=$(mktemp /tmp/test_lwt_ip_encap.XXXXXX)
+
+	sleep 1  # reduce flakiness
+	set +e
+}
+
+cleanup()
+{
+	if [ -f ${TMPFILE} ] ; then
+		rm ${TMPFILE}
+	fi
+
+	ip netns del ${NS1} 2> /dev/null
+	ip netns del ${NS2} 2> /dev/null
+	ip netns del ${NS3} 2> /dev/null
+}
+
+trap cleanup EXIT
+
+remove_routes_to_gredev()
+{
+	ip -netns ${NS1} route del ${IPv4_GRE} dev veth5 ${VRF}
+	ip -netns ${NS2} route del ${IPv4_GRE} dev veth7 ${VRF}
+	ip -netns ${NS1} -6 route del ${IPv6_GRE}/128 dev veth5 ${VRF}
+	ip -netns ${NS2} -6 route del ${IPv6_GRE}/128 dev veth7 ${VRF}
+}
+
+add_unreachable_routes_to_gredev()
+{
+	ip -netns ${NS1} route add unreachable ${IPv4_GRE}/32 ${VRF}
+	ip -netns ${NS2} route add unreachable ${IPv4_GRE}/32 ${VRF}
+	ip -netns ${NS1} -6 route add unreachable ${IPv6_GRE}/128 ${VRF}
+	ip -netns ${NS2} -6 route add unreachable ${IPv6_GRE}/128 ${VRF}
+}
+
+test_ping()
+{
+	local readonly PROTO=$1
+	local readonly EXPECTED=$2
+	local RET=0
+
+	if [ "${PROTO}" == "IPv4" ] ; then
+		ip netns exec ${NS1} ping  -c 1 -W 1 -I veth1 ${IPv4_DST} 2>&1 > /dev/null
+		RET=$?
+	elif [ "${PROTO}" == "IPv6" ] ; then
+		ip netns exec ${NS1} ping6 -c 1 -W 1 -I veth1 ${IPv6_DST} 2>&1 > /dev/null
+		RET=$?
+	else
+		echo "    test_ping: unknown PROTO: ${PROTO}"
+		TEST_STATUS=1
+	fi
+
+	if [ "0" != "${RET}" ]; then
+		RET=1
+	fi
+
+	if [ "${EXPECTED}" != "${RET}" ] ; then
+		echo "    test_ping failed: expected: ${EXPECTED}; got ${RET}"
+		TEST_STATUS=1
+	fi
+}
+
+test_gso()
+{
+	local readonly PROTO=$1
+	local readonly PKT_SZ=5000
+	local IP_DST=""
+	: > ${TMPFILE}  # trim the capture file
+
+	# check that nc is present
+	command -v nc >/dev/null 2>&1 || \
+		{ echo >&2 "nc is not available: skipping TSO tests"; return; }
+
+	# listen on port 9000, capture TCP into $TMPFILE
+	if [ "${PROTO}" == "IPv4" ] ; then
+		IP_DST=${IPv4_DST}
+		ip netns exec ${NS3} bash -c \
+			"nc -4 -l -p 9000 > ${TMPFILE} &"
+	elif [ "${PROTO}" == "IPv6" ] ; then
+		IP_DST=${IPv6_DST}
+		ip netns exec ${NS3} bash -c \
+			"nc -6 -l -p 9000 > ${TMPFILE} &"
+		RET=$?
+	else
+		echo "    test_gso: unknown PROTO: ${PROTO}"
+		TEST_STATUS=1
+	fi
+	sleep 1  # let nc start listening
+
+	# send a packet larger than MTU
+	ip netns exec ${NS1} bash -c \
+		"dd if=/dev/zero bs=$PKT_SZ count=1 > /dev/tcp/${IP_DST}/9000 2>/dev/null"
+	sleep 2 # let the packet get delivered
+
+	# verify we received all expected bytes
+	SZ=$(stat -c %s ${TMPFILE})
+	if [ "$SZ" != "$PKT_SZ" ] ; then
+		echo "    test_gso failed: ${PROTO}"
+		TEST_STATUS=1
+	fi
+}
+
+test_egress()
+{
+	local readonly ENCAP=$1
+	echo "starting egress ${ENCAP} encap test ${VRF}"
+	setup
+
+	# by default, pings work
+	test_ping IPv4 0
+	test_ping IPv6 0
+
+	# remove NS2->DST routes, ping fails
+	ip -netns ${NS2}    route del ${IPv4_DST}/32  dev veth3 ${VRF}
+	ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3 ${VRF}
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	# install replacement routes (LWT/eBPF), pings succeed
+	if [ "${ENCAP}" == "IPv4" ] ; then
+		ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj \
+			${BPF_FILE} sec encap_gre dev veth1 ${VRF}
+		ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj \
+			${BPF_FILE} sec encap_gre dev veth1 ${VRF}
+	elif [ "${ENCAP}" == "IPv6" ] ; then
+		ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj \
+			${BPF_FILE} sec encap_gre6 dev veth1 ${VRF}
+		ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj \
+			${BPF_FILE} sec encap_gre6 dev veth1 ${VRF}
+	else
+		echo "    unknown encap ${ENCAP}"
+		TEST_STATUS=1
+	fi
+	test_ping IPv4 0
+	test_ping IPv6 0
+
+	# skip GSO tests with VRF: VRF routing needs properly assigned
+	# source IP/device, which is easy to do with ping and hard with dd/nc.
+	if [ -z "${VRF}" ] ; then
+		test_gso IPv4
+		test_gso IPv6
+	fi
+
+	# a negative test: remove routes to GRE devices: ping fails
+	remove_routes_to_gredev
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	# another negative test
+	add_unreachable_routes_to_gredev
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	cleanup
+	process_test_results
+}
+
+test_ingress()
+{
+	local readonly ENCAP=$1
+	echo "starting ingress ${ENCAP} encap test ${VRF}"
+	setup
+
+	# need to wait a bit for IPv6 to autoconf, otherwise
+	# ping6 sometimes fails with "unable to bind to address"
+
+	# by default, pings work
+	test_ping IPv4 0
+	test_ping IPv6 0
+
+	# remove NS2->DST routes, pings fail
+	ip -netns ${NS2}    route del ${IPv4_DST}/32  dev veth3 ${VRF}
+	ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3 ${VRF}
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	# install replacement routes (LWT/eBPF), pings succeed
+	if [ "${ENCAP}" == "IPv4" ] ; then
+		ip -netns ${NS2} route add ${IPv4_DST} encap bpf in obj \
+			${BPF_FILE} sec encap_gre dev veth2 ${VRF}
+		ip -netns ${NS2} -6 route add ${IPv6_DST} encap bpf in obj \
+			${BPF_FILE} sec encap_gre dev veth2 ${VRF}
+	elif [ "${ENCAP}" == "IPv6" ] ; then
+		ip -netns ${NS2} route add ${IPv4_DST} encap bpf in obj \
+			${BPF_FILE} sec encap_gre6 dev veth2 ${VRF}
+		ip -netns ${NS2} -6 route add ${IPv6_DST} encap bpf in obj \
+			${BPF_FILE} sec encap_gre6 dev veth2 ${VRF}
+	else
+		echo "FAIL: unknown encap ${ENCAP}"
+		TEST_STATUS=1
+	fi
+	test_ping IPv4 0
+	test_ping IPv6 0
+
+	# a negative test: remove routes to GRE devices: ping fails
+	remove_routes_to_gredev
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	# another negative test
+	add_unreachable_routes_to_gredev
+	test_ping IPv4 1
+	test_ping IPv6 1
+
+	cleanup
+	process_test_results
+}
+
+VRF=""
+test_egress IPv4
+test_egress IPv6
+test_ingress IPv4
+test_ingress IPv6
+
+VRF="vrf red"
+test_egress IPv4
+test_egress IPv6
+test_ingress IPv4
+test_ingress IPv6
+
+print_test_summary_and_exit