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: Lourdes Pedrajas <lu@pplo.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 71a62e7..77c09cd 100755 (executable)
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -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 \