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Date: Mon, 1 Nov 2021 10:36:30 -0700
From: James Prestwood <prestwoj@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, corbet@....net,
yoshfuji@...ux-ipv6.org, dsahern@...nel.org, roopa@...dia.com,
daniel@...earbox.net, vladimir.oltean@....com, idosch@...dia.com,
nikolay@...dia.com, yajun.deng@...ux.dev, zhutong@...zon.com,
johannes@...solutions.net, jouni@...eaurora.org,
James Prestwood <prestwoj@...il.com>
Subject: [PATCH 3/3] selftests: net: add arp_ndisc_evict_nocarrier
This tests the sysctl options for ARP/ND:
/net/ipv4/conf/<iface>/arp_evict_nocarrier
/net/ipv4/conf/all/arp_evict_nocarrier
/net/ipv6/conf/<iface>/ndisc_evict_nocarrier
/net/ipv6/conf/all/ndisc_evict_nocarrier
Signed-off-by: James Prestwood <prestwoj@...il.com>
---
.../net/arp_ndisc_evict_nocarrier.sh | 220 ++++++++++++++++++
1 file changed, 220 insertions(+)
create mode 100755 tools/testing/selftests/net/arp_ndisc_evict_nocarrier.sh
diff --git a/tools/testing/selftests/net/arp_ndisc_evict_nocarrier.sh b/tools/testing/selftests/net/arp_ndisc_evict_nocarrier.sh
new file mode 100755
index 000000000000..b5af08af8559
--- /dev/null
+++ b/tools/testing/selftests/net/arp_ndisc_evict_nocarrier.sh
@@ -0,0 +1,220 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Tests sysctl options {arp,ndisc}_evict_nocarrier={0,1}
+#
+# Create a veth pair and set IPs/routes on both. Then ping to establish
+# an entry in the ARP/ND table. Depending on the test set sysctl option to
+# 1 or 0. Set remote veth down which will cause local veth to go into a no
+# carrier state. Depending on the test check the ARP/ND table:
+#
+# {arp,ndisc}_evict_nocarrier=1 should contain no ARP/ND after no carrier
+# {arp,ndisc}_evict_nocarrer=0 should still contain the single ARP/ND entry
+#
+
+readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
+readonly V4_ADDR0=10.0.10.1
+readonly V4_ADDR1=10.0.10.2
+readonly V6_ADDR0=2001:db8:91::1
+readonly V6_ADDR1=2001:db8:91::2
+nsid=100
+
+cleanup_v6()
+{
+ ip netns del me
+ ip netns del peer
+
+ sysctl -w net.ipv4.conf.veth0.ndisc_evict_nocarrier=1 >/dev/null 2>&1
+ sysctl -w net.ipv4.conf.all.ndisc_evict_nocarrier=1 >/dev/null 2>&1
+}
+
+create_ns()
+{
+ local n=${1}
+
+ ip netns del ${n} 2>/dev/null
+
+ ip netns add ${n}
+ ip netns set ${n} $((nsid++))
+ ip -netns ${n} link set lo up
+}
+
+
+setup_v6() {
+ create_ns me
+ create_ns peer
+
+ IP="ip -netns me"
+
+ $IP li add veth1 type veth peer name veth2
+ $IP li set veth1 up
+ $IP -6 addr add $V6_ADDR0/64 dev veth1 nodad
+ $IP li set veth2 netns peer up
+ ip -netns peer -6 addr add $V6_ADDR1/64 dev veth2 nodad
+
+ ip netns exec me sysctl -w $1 >/dev/null 2>&1
+
+ # Establish an ND cache entry
+ ip netns exec me ping -6 -c1 -Iveth1 $V6_ADDR1 >/dev/null 2>&1
+ # Should have the veth1 entry in ND table
+ ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
+ if [ $? -ne 0 ]; then
+ cleanup_v6
+ echo "failed"
+ exit
+ fi
+
+ # Set veth2 down, which will put veth1 in NOCARRIER state
+ ip netns exec peer ip link set veth2 down
+}
+
+setup_v4() {
+ ip netns add "${PEER_NS}"
+ ip link add name veth0 type veth peer name veth1
+ ip link set dev veth0 up
+ ip link set dev veth1 netns "${PEER_NS}"
+ ip netns exec "${PEER_NS}" ip link set dev veth1 up
+ ip addr add $V4_ADDR0/24 dev veth0
+ ip netns exec "${PEER_NS}" ip addr add $V4_ADDR1/24 dev veth1
+ ip netns exec ${PEER_NS} ip route add default via $V4_ADDR1 dev veth1
+ ip route add default via $V4_ADDR0 dev veth0
+
+ sysctl -w "$1" >/dev/null 2>&1
+
+ # Establish an ARP cache entry
+ ping -c1 -I veth0 $V4_ADDR1 -q >/dev/null 2>&1
+ # Should have the veth1 entry in ARP table
+ ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
+ if [ $? -ne 0 ]; then
+ cleanup_v4
+ echo "failed"
+ exit
+ fi
+
+ # Set veth1 down, which will put veth0 in NOCARRIER state
+ ip netns exec "${PEER_NS}" ip link set veth1 down
+}
+
+cleanup_v4() {
+ ip neigh flush dev veth0
+ ip link del veth0
+ local -r ns="$(ip netns list|grep $PEER_NS)"
+ [ -n "$ns" ] && ip netns del $ns 2>/dev/null
+
+ sysctl -w net.ipv4.conf.veth0.arp_evict_nocarrier=1 >/dev/null 2>&1
+ sysctl -w net.ipv4.conf.all.arp_evict_nocarrier=1 >/dev/null 2>&1
+}
+
+# Run test when arp_evict_nocarrier = 1 (default).
+run_arp_evict_nocarrier_enabled() {
+ echo "run arp_evict_nocarrier=1 test"
+ setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=1"
+
+ # ARP table should be empty
+ ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "failed"
+ else
+ echo "ok"
+ fi
+
+ cleanup_v4
+}
+
+# Run test when arp_evict_nocarrier = 0
+run_arp_evict_nocarrier_disabled() {
+ echo "run arp_evict_nocarrier=0 test"
+ setup_v4 "net.ipv4.conf.veth0.arp_evict_nocarrier=0"
+
+ # ARP table should still contain the entry
+ ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "ok"
+ else
+ echo "failed"
+ fi
+
+ cleanup_v4
+}
+
+run_arp_evict_nocarrier_disabled_all() {
+ echo "run all.arp_evict_nocarrier=0 test"
+ setup_v4 "net.ipv4.conf.all.arp_evict_nocarrier=0"
+
+ # ARP table should still contain the entry
+ ip neigh get $V4_ADDR1 dev veth0 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "ok"
+ else
+ echo "failed"
+ fi
+
+ cleanup_v4
+}
+
+run_ndisc_evict_nocarrier_enabled() {
+ echo "run ndisc_evict_nocarrier=1 test"
+
+ setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=1"
+
+ ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "failed"
+ else
+ echo "ok"
+ fi
+
+ cleanup_v6
+}
+
+run_ndisc_evict_nocarrier_disabled() {
+ echo "run ndisc_evict_nocarrier=0 test"
+
+ setup_v6 "net.ipv6.conf.veth1.ndisc_evict_nocarrier=0"
+
+ ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "ok"
+ else
+ echo "failed"
+ fi
+
+ cleanup_v6
+}
+
+run_ndisc_evict_nocarrier_disabled_all() {
+ echo "run all.ndisc_evict_nocarrier=0 test"
+
+ setup_v6 "net.ipv6.conf.all.ndisc_evict_nocarrier=0"
+
+ ip netns exec me ip -6 neigh get $V6_ADDR1 dev veth1 >/dev/null 2>&1
+
+ if [ $? -eq 0 ];then
+ echo "ok"
+ else
+ echo "failed"
+ fi
+
+ cleanup_v6
+}
+
+run_all_tests() {
+ run_arp_evict_nocarrier_enabled
+ run_arp_evict_nocarrier_disabled
+ run_arp_evict_nocarrier_disabled_all
+ run_ndisc_evict_nocarrier_enabled
+ run_ndisc_evict_nocarrier_disabled
+ run_ndisc_evict_nocarrier_disabled_all
+}
+
+if [ "$(id -u)" -ne 0 ];then
+ echo "SKIP: Need root privileges"
+ exit $ksft_skip;
+fi
+
+run_all_tests
--
2.31.1
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