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selftests/bpf: test that GSO works in lwt_ip_encap

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Add a test on egress that a large TCP packet successfully goes through
the lwt+bpf encap tunnel.

Although there is no direct evidence that GSO worked, as opposed to
e.g. TCP segmentation or IP fragmentation (maybe a kernel stats counter
should be added to track the number of failed GSO attempts?), without
the previous patch in the patchset this test fails, and printk-debugging
showed that software-based GSO succeeded here (veth is not compatible with
SKB_GSO_DODGY, so GSO happens in the software stack).

Also removed an unnecessary nodad and added a missed failed flag.

Signed-off-by: Peter Oskolkov <posk@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Peter Oskolkov 2019-03-04 16:27:09 -08:00 committed by Daniel Borkmann
parent ea0371f787
commit 17a90a7884
1 changed files with 52 additions and 2 deletions
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54
tools/testing/selftests/bpf/test_lwt_ip_encap.sh
View File

@ -78,6 +78,8 @@ TEST_STATUS=0
TESTS_SUCCEEDED=0
TESTS_FAILED=0
TMPFILE=""
process_test_results()
{
if [[ "${TEST_STATUS}" -eq 0 ]] ; then
@ -147,7 +149,6 @@ setup()
ip -netns ${NS2} -6 addr add ${IPv6_7}/128 nodad dev veth7
ip -netns ${NS3} -6 addr add ${IPv6_8}/128 nodad dev veth8
ip -netns ${NS1} link set dev veth1 up
ip -netns ${NS2} link set dev veth2 up
ip -netns ${NS2} link set dev veth3 up
@ -205,7 +206,7 @@ setup()
# configure IPv4 GRE device in NS3, and a route to it via the "bottom" route
ip -netns ${NS3} tunnel add gre_dev mode gre remote ${IPv4_1} local ${IPv4_GRE} ttl 255
ip -netns ${NS3} link set gre_dev up
ip -netns ${NS3} addr add ${IPv4_GRE} nodad dev gre_dev
ip -netns ${NS3} addr add ${IPv4_GRE} dev gre_dev
ip -netns ${NS1} route add ${IPv4_GRE}/32 dev veth5 via ${IPv4_6}
ip -netns ${NS2} route add ${IPv4_GRE}/32 dev veth7 via ${IPv4_8}
@ -222,12 +223,18 @@ setup()
ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
TMPFILE=$(mktemp /tmp/test_lwt_ip_encap.XXXXXX)
sleep 1 # reduce flakiness
set +e
}
cleanup()
{
if [ -f ${TMPFILE} ] ; then
rm ${TMPFILE}
fi
ip netns del ${NS1} 2> /dev/null
ip netns del ${NS2} 2> /dev/null
ip netns del ${NS3} 2> /dev/null
@ -278,6 +285,46 @@ test_ping()
fi
}
test_gso()
{
local readonly PROTO=$1
local readonly PKT_SZ=5000
local IP_DST=""
: > ${TMPFILE} # trim the capture file
# check that nc is present
command -v nc >/dev/null 2>&1 || \
{ echo >&2 "nc is not available: skipping TSO tests"; return; }
# listen on IPv*_DST, capture TCP into $TMPFILE
if [ "${PROTO}" == "IPv4" ] ; then
IP_DST=${IPv4_DST}
ip netns exec ${NS3} bash -c \
"nc -4 -l -s ${IPv4_DST} -p 9000 > ${TMPFILE} &"
elif [ "${PROTO}" == "IPv6" ] ; then
IP_DST=${IPv6_DST}
ip netns exec ${NS3} bash -c \
"nc -6 -l -s ${IPv6_DST} -p 9000 > ${TMPFILE} &"
RET=$?
else
echo " test_gso: unknown PROTO: ${PROTO}"
TEST_STATUS=1
fi
sleep 1 # let nc start listening
# send a packet larger than MTU
ip netns exec ${NS1} bash -c \
"dd if=/dev/zero bs=$PKT_SZ count=1 > /dev/tcp/${IP_DST}/9000 2>/dev/null"
sleep 2 # let the packet get delivered
# verify we received all expected bytes
SZ=$(stat -c %s ${TMPFILE})
if [ "$SZ" != "$PKT_SZ" ] ; then
echo " test_gso failed: ${PROTO}"
TEST_STATUS=1
fi
}
test_egress()
{
local readonly ENCAP=$1
@ -307,6 +354,8 @@ test_egress()
fi
test_ping IPv4 0
test_ping IPv6 0
test_gso IPv4
test_gso IPv6
# a negative test: remove routes to GRE devices: ping fails
remove_routes_to_gredev
@ -350,6 +399,7 @@ test_ingress()
ip -netns ${NS2} -6 route add ${IPv6_DST} encap bpf in obj test_lwt_ip_encap.o sec encap_gre6 dev veth2
else
echo "FAIL: unknown encap ${ENCAP}"
TEST_STATUS=1
fi
test_ping IPv4 0
test_ping IPv6 0