Commit 56fd865f authored by Stefano Brivio's avatar Stefano Brivio Committed by David S. Miller
Browse files

selftests: pmtu: Introduce FoU and GUE PMTU exceptions tests 



Introduce eight tests, for FoU and GUE, with IPv4 and IPv6 payload,
on IPv4 and IPv6 transport, that check that PMTU exceptions are created
with the right value when exceeding the MTU on a link of the path.

Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Reviewed-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b8a51b38

tools/testing/selftests/net/pmtu.sh

+179 −0
Original line number Diff line number Diff line
@@ -59,6 +59,14 @@ 
#	Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of

#	VXLAN

#

# - pmtu_ipv{4,6}_fou{4,6}_exception

#	Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation

#	(FoU) over IPv4/IPv6, instead of VXLAN

#

# - pmtu_ipv{4,6}_fou{4,6}_exception

#	Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6

#	encapsulation (GUE) over IPv4/IPv6, instead of VXLAN

#

# - pmtu_vti4_exception

#	Set up vti tunnel on top of veth, with xfrm states and policies, in two

#	namespaces with matching endpoints. Check that route exception is not
@@ -113,6 +121,14 @@ tests=" 
	pmtu_ipv6_geneve4_exception	IPv6 over geneve4: PMTU exceptions

	pmtu_ipv4_geneve6_exception	IPv4 over geneve6: PMTU exceptions

	pmtu_ipv6_geneve6_exception	IPv6 over geneve6: PMTU exceptions

	pmtu_ipv4_fou4_exception	IPv4 over fou4: PMTU exceptions

	pmtu_ipv6_fou4_exception	IPv6 over fou4: PMTU exceptions

	pmtu_ipv4_fou6_exception	IPv4 over fou6: PMTU exceptions

	pmtu_ipv6_fou6_exception	IPv6 over fou6: PMTU exceptions

	pmtu_ipv4_gue4_exception	IPv4 over gue4: PMTU exceptions

	pmtu_ipv6_gue4_exception	IPv6 over gue4: PMTU exceptions

	pmtu_ipv4_gue6_exception	IPv4 over gue6: PMTU exceptions

	pmtu_ipv6_gue6_exception	IPv6 over gue6: PMTU exceptions

	pmtu_vti6_exception		vti6: PMTU exceptions

	pmtu_vti4_exception		vti4: PMTU exceptions

	pmtu_vti4_default_mtu		vti4: default MTU assignment
@@ -200,6 +216,89 @@ nsname() { 
	eval echo \$NS_$1

}



setup_fou_or_gue() {

	outer="${1}"

	inner="${2}"

	encap="${3}"



	if [ "${outer}" = "4" ]; then

		modprobe fou || return 2

		a_addr="${prefix4}.${a_r1}.1"

		b_addr="${prefix4}.${b_r1}.1"

		if [ "${inner}" = "4" ]; then

			type="ipip"

			ipproto="4"

		else

			type="sit"

			ipproto="41"

		fi

	else

		modprobe fou6 || return 2

		a_addr="${prefix6}:${a_r1}::1"

		b_addr="${prefix6}:${b_r1}::1"

		if [ "${inner}" = "4" ]; then

			type="ip6tnl"

			mode="mode ipip6"

			ipproto="4 -6"

		else

			type="ip6tnl"

			mode="mode ip6ip6"

			ipproto="41 -6"

		fi

	fi



	${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2

	${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return 2



	${ns_b} ip fou add port 5556 ipproto ${ipproto}

	${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555



	if [ "${inner}" = "4" ]; then

		${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a

		${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b

	else

		${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a

		${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b

	fi



	${ns_a} ip link set ${encap}_a up

	${ns_b} ip link set ${encap}_b up



	sleep 1

}



setup_fou44() {

	setup_fou_or_gue 4 4 fou

}



setup_fou46() {

	setup_fou_or_gue 4 6 fou

}



setup_fou64() {

	setup_fou_or_gue 6 4 fou

}



setup_fou66() {

	setup_fou_or_gue 6 6 fou

}



setup_gue44() {

	setup_fou_or_gue 4 4 gue

}



setup_gue46() {

	setup_fou_or_gue 4 6 gue

}



setup_gue64() {

	setup_fou_or_gue 6 4 gue

}



setup_gue66() {

	setup_fou_or_gue 6 6 gue

}



setup_namespaces() {

	for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do

		ip netns add ${n} || return 1
@@ -627,6 +726,86 @@ test_pmtu_ipv6_geneve6_exception() { 
	test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6

}



test_pmtu_ipvX_over_fouY_or_gueY() {

	inner_family=${1}

	outer_family=${2}

	encap=${3}

	ll_mtu=4000



	setup namespaces routing ${encap}${outer_family}${inner_family} || return 2

	trace "${ns_a}" ${encap}_a   "${ns_b}"  ${encap}_b \

	      "${ns_a}" veth_A-R1    "${ns_r1}" veth_R1-A \

	      "${ns_b}" veth_B-R1    "${ns_r1}" veth_R1-B



	if [ ${inner_family} -eq 4 ]; then

		ping=ping

		dst=${tunnel4_b_addr}

	else

		ping=${ping6}

		dst=${tunnel6_b_addr}

	fi



	if [ "${encap}" = "gue" ]; then

		encap_overhead=4

	else

		encap_overhead=0

	fi



	if [ ${outer_family} -eq 4 ]; then

		#                      IPv4 header   UDP header

		exp_mtu=$((${ll_mtu} - 20          - 8         - ${encap_overhead}))

	else

		#                      IPv6 header   Option 4   UDP header

		exp_mtu=$((${ll_mtu} - 40          - 8        - 8       - ${encap_overhead}))

	fi



	# Create route exception by exceeding link layer MTU

	mtu "${ns_a}"  veth_A-R1 $((${ll_mtu} + 1000))

	mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))

	mtu "${ns_b}"  veth_B-R1 ${ll_mtu}

	mtu "${ns_r1}" veth_R1-B ${ll_mtu}



	mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))

	mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))

	${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null



	# Check that exception was created

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"

	check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"

}



test_pmtu_ipv4_fou4_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou

}



test_pmtu_ipv6_fou4_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou

}



test_pmtu_ipv4_fou6_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou

}



test_pmtu_ipv6_fou6_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou

}



test_pmtu_ipv4_gue4_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue

}



test_pmtu_ipv6_gue4_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue

}



test_pmtu_ipv4_gue6_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue

}



test_pmtu_ipv6_gue6_exception() {

	test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue

}



test_pmtu_vti4_exception() {

	setup namespaces veth vti4 xfrm4 || return 2

	trace "${ns_a}" veth_a    "${ns_b}" veth_b \

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