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Guillaume NaultPaolo Abeni
Guillaume Nault
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Paolo Abeni
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selftests: Add IPv6 link-local address generation tests for GRE devices.
GRE devices have their special code for IPv6 link-local address generation that has been the source of several regressions in the past. Add selftest to check that all gre, ip6gre, gretap and ip6gretap get an IPv6 link-link local address in accordance with the net.ipv6.conf.<dev>.addr_gen_mode sysctl. Signed-off-by: Guillaume Nault <[email protected]> Reviewed-by: Ido Schimmel <[email protected]> Tested-by: Ido Schimmel <[email protected]> Reviewed-by: Petr Machata <[email protected]> Link: https://patch.msgid.link/2d6772af8e1da9016b2180ec3f8d9ee99f470c77.1741375285.git.gnault@redhat.com Signed-off-by: Paolo Abeni <[email protected]>
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‎tools/testing/selftests/net/Makefile

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@@ -31,6 +31,7 @@ TEST_PROGS += veth.sh
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TEST_PROGS += ioam6.sh
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TEST_PROGS += gro.sh
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TEST_PROGS += gre_gso.sh
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TEST_PROGS += gre_ipv6_lladdr.sh
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TEST_PROGS += cmsg_so_mark.sh
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TEST_PROGS += cmsg_so_priority.sh
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TEST_PROGS += cmsg_time.sh cmsg_ipv6.sh

‎tools/testing/selftests/net/gre_ipv6_lladdr.sh

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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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source ./lib.sh
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PAUSE_ON_FAIL="no"
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# The trap function handler
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#
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exit_cleanup_all()
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{
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cleanup_all_ns
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exit "${EXIT_STATUS}"
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}
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# Add fake IPv4 and IPv6 networks on the loopback device, to be used as
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# underlay by future GRE devices.
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#
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setup_basenet()
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{
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ip -netns "${NS0}" link set dev lo up
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ip -netns "${NS0}" address add dev lo 192.0.2.10/24
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ip -netns "${NS0}" address add dev lo 2001:db8::10/64 nodad
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}
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# Check if network device has an IPv6 link-local address assigned.
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#
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# Parameters:
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#
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# * $1: The network device to test
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# * $2: An extra regular expression that should be matched (to verify the
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# presence of extra attributes)
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# * $3: The expected return code from grep (to allow checking the absence of
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# a link-local address)
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# * $4: The user visible name for the scenario being tested
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#
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check_ipv6_ll_addr()
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{
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local DEV="$1"
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local EXTRA_MATCH="$2"
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local XRET="$3"
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local MSG="$4"
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RET=0
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set +e
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ip -netns "${NS0}" -6 address show dev "${DEV}" scope link | grep "fe80::" | grep -q "${EXTRA_MATCH}"
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check_err_fail "${XRET}" $? ""
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log_test "${MSG}"
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set -e
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}
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# Create a GRE device and verify that it gets an IPv6 link-local address as
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# expected.
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#
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# Parameters:
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#
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# * $1: The device type (gre, ip6gre, gretap or ip6gretap)
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# * $2: The local underlay IP address (can be an IPv4, an IPv6 or "any")
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# * $3: The remote underlay IP address (can be an IPv4, an IPv6 or "any")
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# * $4: The IPv6 interface identifier generation mode to use for the GRE
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# device (eui64, none, stable-privacy or random).
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#
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test_gre_device()
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{
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local GRE_TYPE="$1"
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local LOCAL_IP="$2"
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local REMOTE_IP="$3"
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local MODE="$4"
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local ADDR_GEN_MODE
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local MATCH_REGEXP
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local MSG
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ip link add netns "${NS0}" name gretest type "${GRE_TYPE}" local "${LOCAL_IP}" remote "${REMOTE_IP}"
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case "${MODE}" in
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"eui64")
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ADDR_GEN_MODE=0
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MATCH_REGEXP=""
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MSG="${GRE_TYPE}, mode: 0 (EUI64), ${LOCAL_IP} -> ${REMOTE_IP}"
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XRET=0
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;;
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"none")
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ADDR_GEN_MODE=1
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MATCH_REGEXP=""
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MSG="${GRE_TYPE}, mode: 1 (none), ${LOCAL_IP} -> ${REMOTE_IP}"
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XRET=1 # No link-local address should be generated
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;;
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"stable-privacy")
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ADDR_GEN_MODE=2
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MATCH_REGEXP="stable-privacy"
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MSG="${GRE_TYPE}, mode: 2 (stable privacy), ${LOCAL_IP} -> ${REMOTE_IP}"
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XRET=0
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# Initialise stable_secret (required for stable-privacy mode)
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ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.stable_secret="2001:db8::abcd"
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;;
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"random")
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ADDR_GEN_MODE=3
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MATCH_REGEXP="stable-privacy"
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MSG="${GRE_TYPE}, mode: 3 (random), ${LOCAL_IP} -> ${REMOTE_IP}"
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XRET=0
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;;
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esac
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# Check that IPv6 link-local address is generated when device goes up
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ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}"
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ip -netns "${NS0}" link set dev gretest up
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check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "config: ${MSG}"
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# Now disable link-local address generation
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ip -netns "${NS0}" link set dev gretest down
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ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode=1
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ip -netns "${NS0}" link set dev gretest up
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# Check that link-local address generation works when re-enabled while
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# the device is already up
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ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}"
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check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "update: ${MSG}"
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ip -netns "${NS0}" link del dev gretest
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}
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test_gre4()
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{
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local GRE_TYPE
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local MODE
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for GRE_TYPE in "gre" "gretap"; do
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printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n"
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for MODE in "eui64" "none" "stable-privacy" "random"; do
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test_gre_device "${GRE_TYPE}" 192.0.2.10 192.0.2.11 "${MODE}"
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test_gre_device "${GRE_TYPE}" any 192.0.2.11 "${MODE}"
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test_gre_device "${GRE_TYPE}" 192.0.2.10 any "${MODE}"
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done
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done
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}
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test_gre6()
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{
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local GRE_TYPE
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local MODE
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for GRE_TYPE in "ip6gre" "ip6gretap"; do
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printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n"
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for MODE in "eui64" "none" "stable-privacy" "random"; do
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test_gre_device "${GRE_TYPE}" 2001:db8::10 2001:db8::11 "${MODE}"
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test_gre_device "${GRE_TYPE}" any 2001:db8::11 "${MODE}"
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test_gre_device "${GRE_TYPE}" 2001:db8::10 any "${MODE}"
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done
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done
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}
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usage()
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{
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echo "Usage: $0 [-p]"
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exit 1
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}
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while getopts :p o
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do
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case $o in
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p) PAUSE_ON_FAIL="yes";;
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*) usage;;
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esac
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done
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setup_ns NS0
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set -e
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trap exit_cleanup_all EXIT
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setup_basenet
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test_gre4
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test_gre6

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