Commit b66c9b8d authored by Lourdes Pedrajas's avatar Lourdes Pedrajas Committed by David S. Miller
Browse files

selftests: pmtu: implement IPIP, SIT and ip6tnl PMTU discovery tests 



Add PMTU discovery tests for these encapsulations:

- IPIP
- SIT, mode ip6ip
- ip6tnl, modes ip6ip6 and ipip6

Signed-off-by: default avatarLourdes Pedrajas <lu@pplo.net>
Reviewed-by: default avatarStefano Brivio <sbrivio@redhat.com>
Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cceadc83

tools/testing/selftests/net/pmtu.sh

+122 −0
Original line number Diff line number Diff line
@@ -67,6 +67,10 @@ 
#	Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6

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

#

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

#	Same as pmtu_ipv4_vxlan4, but using a IPv4/IPv6 tunnel 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
@@ -151,6 +155,10 @@ tests=" 
	pmtu_ipv6_gue4_exception	IPv6 over gue4: PMTU exceptions		1

	pmtu_ipv4_gue6_exception	IPv4 over gue6: PMTU exceptions		1

	pmtu_ipv6_gue6_exception	IPv6 over gue6: PMTU exceptions		1

	pmtu_ipv4_ipv4_exception	IPv4 over IPv4: PMTU exceptions		1

	pmtu_ipv6_ipv4_exception	IPv6 over IPv4: PMTU exceptions		1

	pmtu_ipv4_ipv6_exception	IPv4 over IPv6: PMTU exceptions		1

	pmtu_ipv6_ipv6_exception	IPv6 over IPv6: PMTU exceptions		1

	pmtu_vti6_exception		vti6: PMTU exceptions			0

	pmtu_vti4_exception		vti4: PMTU exceptions			0

	pmtu_vti4_default_mtu		vti4: default MTU assignment		0
@@ -363,6 +371,62 @@ setup_gue66() { 
	setup_fou_or_gue 6 6 gue

}



setup_ipvX_over_ipvY() {

	inner=${1}

	outer=${2}



	if [ "${outer}" -eq 4 ]; then

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

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

		if [ "${inner}" -eq 4 ]; then

			type="ipip"

			mode="ipip"

		else

			type="sit"

			mode="ip6ip"

		fi

	else

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

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

		type="ip6tnl"

		if [ "${inner}" -eq 4 ]; then

			mode="ipip6"

		else

			mode="ip6ip6"

		fi

	fi



	run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return 2

	run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}



	run_cmd ${ns_a} ip link set ip_a up

	run_cmd ${ns_b} ip link set ip_b up



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

		run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a

		run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b

	else

		run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a

		run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b

	fi

}



setup_ip4ip4() {

	setup_ipvX_over_ipvY 4 4

}



setup_ip6ip4() {

	setup_ipvX_over_ipvY 6 4

}



setup_ip4ip6() {

	setup_ipvX_over_ipvY 4 6

}



setup_ip6ip6() {

	setup_ipvX_over_ipvY 6 6

}



setup_namespaces() {

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

		ip netns add ${n} || return 1
@@ -908,6 +972,64 @@ test_pmtu_ipv6_gue6_exception() { 
	test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue

}



test_pmtu_ipvX_over_ipvY_exception() {

	inner=${1}

	outer=${2}

	ll_mtu=4000



	setup namespaces routing ip${inner}ip${outer} || return 2



	trace "${ns_a}" ip_a         "${ns_b}"  ip_b  \

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

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



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

		ping=ping

		dst=${tunnel4_b_addr}

	else

		ping=${ping6}

		dst=${tunnel6_b_addr}

	fi



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

		#                      IPv4 header

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

	else

		#                      IPv6 header   Option 4

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

	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}" ip_a $((${ll_mtu} + 1000)) || return

	mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}



	# 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 ip${inner}ip${outer} interface"

}



test_pmtu_ipv4_ipv4_exception() {

	test_pmtu_ipvX_over_ipvY_exception 4 4

}



test_pmtu_ipv6_ipv4_exception() {

	test_pmtu_ipvX_over_ipvY_exception 6 4

}



test_pmtu_ipv4_ipv6_exception() {

	test_pmtu_ipvX_over_ipvY_exception 4 6

}



test_pmtu_ipv6_ipv6_exception() {

	test_pmtu_ipvX_over_ipvY_exception 6 6

}



test_pmtu_vti4_exception() {

	setup namespaces veth vti4 xfrm4 || return 2

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

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