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selftests/net: add test for IP-in-IPv6 tunneling 

commit 81c734dae2 ("ip6_tunnel: use skb_vlan_inet_prepare() in
__ip6_tnl_rcv()") was fine in and of itself, but its backport to 6.12
(and 6.6) broke IPv4-in-IPv6 tunneling, see [1]. This adds a self-test
for basic IPv4-in-IPv6 and IPv6-in-IPv6 functionality.

[1]: https://lore.kernel.org/all/CAA2RiuSnH_2xc+-W6EnFEG00XjS-dszMq61JEvRjcGS31CBw=g@mail.gmail.com/

Signed-off-by: Linus Heckemann <git@sphalerite.org>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Ricardo B. Marlière <rbm@suse.com>
Tested-by: Ricardo B. Marlière <rbm@suse.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260221114806.1231666-1-git@sphalerite.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
master
Linus Heckemann 2026-02-21 12:48:06 +01:00 committed by Jakub Kicinski
parent 8bf22c33e7
commit f77c7b9601
2 changed files with 45 additions and 0 deletions
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1
tools/testing/selftests/net/Makefile
View File

@ -44,6 +44,7 @@ TEST_PROGS := \
io_uring_zerocopy_tx.sh \
ioam6.sh \
ip6_gre_headroom.sh \
ip6_tunnel.sh \
ip_defrag.sh \
ip_local_port_range.sh \
ipv6_flowlabel.sh \

44
tools/testing/selftests/net/ip6_tunnel.sh Executable file
View File

@ -0,0 +1,44 @@
#!/bin/bash
# Test that IPv4-over-IPv6 tunneling works.
source lib.sh
set -e
setup_prepare() {
ip link add transport1 type veth peer name transport2
setup_ns ns1
ip link set transport1 netns $ns1
ip -n $ns1 address add 2001:db8::1/64 dev transport1 nodad
ip -n $ns1 address add 2001:db8::3/64 dev transport1 nodad
ip -n $ns1 link set transport1 up
ip -n $ns1 link add link transport1 name tunnel4 type ip6tnl mode ipip6 local 2001:db8::1 remote 2001:db8::2
ip -n $ns1 address add 172.0.0.1/32 peer 172.0.0.2/32 dev tunnel4
ip -n $ns1 link set tunnel4 up
ip -n $ns1 link add link transport1 name tunnel6 type ip6tnl mode ip6ip6 local 2001:db8::3 remote 2001:db8::4
ip -n $ns1 address add 2001:db8:6::1/64 dev tunnel6
ip -n $ns1 link set tunnel6 up
setup_ns ns2
ip link set transport2 netns $ns2
ip -n $ns2 address add 2001:db8::2/64 dev transport2 nodad
ip -n $ns2 address add 2001:db8::4/64 dev transport2 nodad
ip -n $ns2 link set transport2 up
ip -n $ns2 link add link transport2 name tunnel4 type ip6tnl mode ipip6 local 2001:db8::2 remote 2001:db8::1
ip -n $ns2 address add 172.0.0.2/32 peer 172.0.0.1/32 dev tunnel4
ip -n $ns2 link set tunnel4 up
ip -n $ns2 link add link transport2 name tunnel6 type ip6tnl mode ip6ip6 local 2001:db8::4 remote 2001:db8::3
ip -n $ns2 address add 2001:db8:6::2/64 dev tunnel6
ip -n $ns2 link set tunnel6 up
}
cleanup() {
cleanup_all_ns
# in case the namespaces haven't been set up yet
ip link delete transport1 &>/dev/null || true
}
trap cleanup EXIT
setup_prepare
ip netns exec $ns1 ping -q -W1 -c1 172.0.0.2 >/dev/null
ip netns exec $ns1 ping -q -W1 -c1 2001:db8:6::2 >/dev/null