selftests: net: Test headroom handling of ip6_gre devices

Commit 5691484df961 ("net: ip6_gre: Fix headroom request in
ip6erspan_tunnel_xmit()") and commit 01b8d064d58b ("net: ip6_gre:
Request headroom in __gre6_xmit()") fix problems in reserving headroom
in the packets tunneled through ip6gre/tap and ip6erspan netdevices.

These two patches included snippets that reproduced the issues. This
patch elevates the snippets to a full-fledged test case.

Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/ip6_gre_headroom.sh b/tools/testing/selftests/net/ip6_gre_headroom.sh
new file mode 100755 (executable)
index 0000000..5b41e8b
--- /dev/null
+++ b/tools/testing/selftests/net/ip6_gre_headroom.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Test that enough headroom is reserved for the first packet passing through an
+# IPv6 GRE-like netdevice.
+
+setup_prepare()
+{
+       ip link add h1 type veth peer name swp1
+       ip link add h3 type veth peer name swp3
+
+       ip link set dev h1 up
+       ip address add 192.0.2.1/28 dev h1
+
+       ip link add dev vh3 type vrf table 20
+       ip link set dev h3 master vh3
+       ip link set dev vh3 up
+       ip link set dev h3 up
+
+       ip link set dev swp3 up
+       ip address add dev swp3 2001:db8:2::1/64
+       ip address add dev swp3 2001:db8:2::3/64
+
+       ip link set dev swp1 up
+       tc qdisc add dev swp1 clsact
+
+       ip link add name er6 type ip6erspan \
+          local 2001:db8:2::1 remote 2001:db8:2::2 oseq okey 123
+       ip link set dev er6 up
+
+       ip link add name gt6 type ip6gretap \
+          local 2001:db8:2::3 remote 2001:db8:2::4
+       ip link set dev gt6 up
+
+       sleep 1
+}
+
+cleanup()
+{
+       ip link del dev gt6
+       ip link del dev er6
+       ip link del dev swp1
+       ip link del dev swp3
+       ip link del dev vh3
+}
+
+test_headroom()
+{
+       local type=$1; shift
+       local tundev=$1; shift
+
+       tc filter add dev swp1 ingress pref 1000 matchall skip_hw \
+               action mirred egress mirror dev $tundev
+       ping -I h1 192.0.2.2 -c 1 -w 2 &> /dev/null
+       tc filter del dev swp1 ingress pref 1000
+
+       # If it doesn't panic, it passes.
+       printf "TEST: %-60s  [PASS]\n" "$type headroom"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+test_headroom ip6gretap gt6
+test_headroom ip6erspan er6