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selftests: netfilter: Stabilize rpath.sh

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[ Upstream commit d92906fd1b940681b4509f7bb8ae737789fb4695 ]

On some systems, neighbor discoveries from ns1 for fec0:42::1 (i.e., the
martian trap address) would happen at the wrong time and cause
false-negative test result.

Problem analysis also discovered that IPv6 martian ping test was broken
in that sent neighbor discoveries, not echo requests were inadvertently
trapped

Avoid the race condition by introducing the neighbors to each other
upfront. Also pin down the firewall rules to matching on echo requests
only.

Fixes: efb056e5f1 ("netfilter: ip6t_rpfilter: Fix regression with VRF interfaces")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phil Sutter
2024-12-06 15:08:40 +01:00
committed by Greg Kroah-Hartman
parent c3a2fb3086
commit baf9d7f5a7
1 changed files with 16 additions and 2 deletions
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tools/testing/selftests/net/netfilter/rpath.sh
+16 -2
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@@ -61,9 +61,20 @@ ip -net "$ns2" a a 192.168.42.1/24 dev d0
ip -net "$ns1" a a fec0:42::2/64 dev v0 nodad
ip -net "$ns2" a a fec0:42::1/64 dev d0 nodad
# avoid neighbor lookups and enable martian IPv6 pings
ns2_hwaddr=$(ip -net "$ns2" link show dev v0 | \
sed -n 's, *link/ether \([^ ]*\) .*,\1,p')
ns1_hwaddr=$(ip -net "$ns1" link show dev v0 | \
sed -n 's, *link/ether \([^ ]*\) .*,\1,p')
ip -net "$ns1" neigh add fec0:42::1 lladdr "$ns2_hwaddr" nud permanent dev v0
ip -net "$ns1" neigh add fec0:23::1 lladdr "$ns2_hwaddr" nud permanent dev v0
ip -net "$ns2" neigh add fec0:42::2 lladdr "$ns1_hwaddr" nud permanent dev d0
ip -net "$ns2" neigh add fec0:23::2 lladdr "$ns1_hwaddr" nud permanent dev v0
# firewall matches to test
[ -n "$iptables" ] && {
common='-t raw -A PREROUTING -s 192.168.0.0/16'
common+=' -p icmp --icmp-type echo-request'
if ! ip netns exec "$ns2" "$iptables" $common -m rpfilter;then
echo "Cannot add rpfilter rule"
exit $ksft_skip
@@ -72,6 +83,7 @@ ip -net "$ns2" a a fec0:42::1/64 dev d0 nodad
}
[ -n "$ip6tables" ] && {
common='-t raw -A PREROUTING -s fec0::/16'
common+=' -p icmpv6 --icmpv6-type echo-request'
if ! ip netns exec "$ns2" "$ip6tables" $common -m rpfilter;then
echo "Cannot add rpfilter rule"
exit $ksft_skip
@@ -82,8 +94,10 @@ ip -net "$ns2" a a fec0:42::1/64 dev d0 nodad
table inet t {
chain c {
type filter hook prerouting priority raw;
ip saddr 192.168.0.0/16 fib saddr . iif oif exists counter
ip6 saddr fec0::/16 fib saddr . iif oif exists counter
ip saddr 192.168.0.0/16 icmp type echo-request \
fib saddr . iif oif exists counter
ip6 saddr fec0::/16 icmpv6 type echo-request \
fib saddr . iif oif exists counter
}
}
EOF