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selftests: forwarding: vxlan_bridge_1d: fix test failure with br_netfilter enabled

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The test generates VXLAN traffic using mausezahn, where the encapsulated
inner IPv4 packet contains a zero IP header checksum. After VXLAN
decapsulation, such packets do not pass sanity checks in br_netfilter
and are dropped, which causes the test to fail.

Fix this by calculating and setting a valid IPv4 header checksum for the
encapsulated packet generated by mausezahn, so that the packet is accepted
by br_netfilter. Fixed by using the payload_template_calc_checksum() /
payload_template_expand_checksum() helpers that are only available
in v6.3 and newer kernels.

Fixes: a0b61f3d8e ("selftests: forwarding: vxlan_bridge_1d: Add an ECN decap test")
Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260213131907.43351-2-aleksey.oladko@virtuozzo.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Aleksei Oladko 2026-02-13 13:19:05 +00:00 • committed by Paolo Abeni
parent 26f29b1491
commit 02cb2e6bac
1 changed files with 16 additions and 10 deletions
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26
tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh
View file

@ -567,6 +567,21 @@ vxlan_encapped_ping_do()
local inner_tos=$1; shift
local outer_tos=$1; shift
local ipv4hdr=$(:
)"45:"$( : IP version + IHL
)"$inner_tos:"$( : IP TOS
)"00:54:"$( : IP total length
)"99:83:"$( : IP identification
)"40:00:"$( : IP flags + frag off
)"40:"$( : IP TTL
)"01:"$( : IP proto
)"CHECKSUM:"$( : IP header csum
)"c0:00:02:03:"$( : IP saddr: 192.0.2.3
)"c0:00:02:01"$( : IP daddr: 192.0.2.1
)
local checksum=$(payload_template_calc_checksum "$ipv4hdr")
ipv4hdr=$(payload_template_expand_checksum "$ipv4hdr" $checksum)
$MZ $dev -c $count -d 100msec -q \
-b $next_hop_mac -B $dest_ip \
-t udp tos=$outer_tos,sp=23456,dp=$VXPORT,p=$(:
@ -577,16 +592,7 @@ vxlan_encapped_ping_do()
)"$dest_mac:"$( : ETH daddr
)"$(mac_get w2):"$( : ETH saddr
)"08:00:"$( : ETH type
)"45:"$( : IP version + IHL
)"$inner_tos:"$( : IP TOS
)"00:54:"$( : IP total length
)"99:83:"$( : IP identification
)"40:00:"$( : IP flags + frag off
)"40:"$( : IP TTL
)"01:"$( : IP proto
)"00:00:"$( : IP header csum
)"c0:00:02:03:"$( : IP saddr: 192.0.2.3
)"c0:00:02:01:"$( : IP daddr: 192.0.2.1
)"$ipv4hdr:"$( : IPv4 header
)"08:"$( : ICMP type
)"00:"$( : ICMP code
)"8b:f2:"$( : ICMP csum