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Date: Fri, 16 Jul 2021 13:54:17 +0300
From: Vadim Fedorenko <vfedorenko@...ek.ru>
To: David Ahern <dsahern@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Xin Long <lucien.xin@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Vadim Fedorenko <vfedorenko@...ek.ru>
Subject: [PATCH net v2 2/2] selftests: net: add ESP-in-UDP PMTU test
The case of ESP in UDP encapsulation was not covered before. Add
cases of local changes of MTU and difference on routed path.
Signed-off-by: Vadim Fedorenko <vfedorenko@...ek.ru>
---
tools/testing/selftests/net/nettest.c | 55 ++++++-
tools/testing/selftests/net/pmtu.sh | 212 +++++++++++++++++++++++++-
2 files changed, 260 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c
index 6365c7fd1262..bd6288302094 100644
--- a/tools/testing/selftests/net/nettest.c
+++ b/tools/testing/selftests/net/nettest.c
@@ -11,9 +11,11 @@
#include <sys/socket.h>
#include <sys/wait.h>
#include <linux/tcp.h>
+#include <linux/udp.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
+#include <netinet/ip.h>
#include <netdb.h>
#include <fcntl.h>
#include <libgen.h>
@@ -27,6 +29,10 @@
#include <time.h>
#include <errno.h>
+#include <linux/xfrm.h>
+#include <linux/ipsec.h>
+#include <linux/pfkeyv2.h>
+
#ifndef IPV6_UNICAST_IF
#define IPV6_UNICAST_IF 76
#endif
@@ -114,6 +120,9 @@ struct sock_args {
struct in_addr in;
struct in6_addr in6;
} expected_raddr;
+
+ /* ESP in UDP encap test */
+ int use_xfrm;
};
static int server_mode;
@@ -1346,6 +1355,41 @@ static int bind_socket(int sd, struct sock_args *args)
return 0;
}
+static int config_xfrm_policy(int sd, struct sock_args *args)
+{
+ struct xfrm_userpolicy_info policy = {};
+ int type = UDP_ENCAP_ESPINUDP;
+ int xfrm_af = IP_XFRM_POLICY;
+ int level = SOL_IP;
+
+ if (args->type != SOCK_DGRAM) {
+ log_error("Invalid socket type. Only DGRAM could be used for XFRM\n");
+ return 1;
+ }
+
+ policy.action = XFRM_POLICY_ALLOW;
+ policy.sel.family = args->version;
+ if (args->version == AF_INET6) {
+ xfrm_af = IPV6_XFRM_POLICY;
+ level = SOL_IPV6;
+ }
+
+ policy.dir = XFRM_POLICY_OUT;
+ if (setsockopt(sd, level, xfrm_af, &policy, sizeof(policy)) < 0)
+ return 1;
+
+ policy.dir = XFRM_POLICY_IN;
+ if (setsockopt(sd, level, xfrm_af, &policy, sizeof(policy)) < 0)
+ return 1;
+
+ if (setsockopt(sd, IPPROTO_UDP, UDP_ENCAP, &type, sizeof(type)) < 0) {
+ log_err_errno("Failed to set xfrm encap");
+ return 1;
+ }
+
+ return 0;
+}
+
static int lsock_init(struct sock_args *args)
{
long flags;
@@ -1389,6 +1433,11 @@ static int lsock_init(struct sock_args *args)
if (fcntl(sd, F_SETFD, FD_CLOEXEC) < 0)
log_err_errno("Failed to set close-on-exec flag");
+ if (args->use_xfrm && config_xfrm_policy(sd, args)) {
+ log_err_errno("Failed to set xfrm policy");
+ goto err;
+ }
+
out:
return sd;
@@ -1772,7 +1821,7 @@ static int ipc_parent(int cpid, int fd, struct sock_args *args)
return client_status;
}
-#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6L:0:1:2:3:Fbq"
+#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6xL:0:1:2:3:Fbq"
static void print_usage(char *prog)
{
@@ -1795,6 +1844,7 @@ static void print_usage(char *prog)
" -D|R datagram (D) / raw (R) socket (default stream)\n"
" -l addr local address to bind to in server mode\n"
" -c addr local address to bind to in client mode\n"
+ " -x configure XFRM policy on socket\n"
"\n"
" -d dev bind socket to given device name\n"
" -I dev bind socket to given device name - server mode\n"
@@ -1966,6 +2016,9 @@ int main(int argc, char *argv[])
case 'q':
quiet = 1;
break;
+ case 'x':
+ args.use_xfrm = 1;
+ break;
default:
print_usage(argv[0]);
return 1;
diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 64cd2e23c568..ac67bd78081a 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -118,6 +118,16 @@
# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
# changes alone won't affect PMTU
#
+# - pmtu_vti4_udp_exception
+# Same as pmtu_vti4_exception, but using ESP-in-UDP
+#
+# - pmtu_vti4_udp_routed_exception
+# Set up vti tunnel on top of veth connected through routing namespace and
+# add xfrm states and policies with ESP-in-UDP encapsulation. Check that
+# route exception is not created if link layer MTU is not exceeded, then
+# lower MTU on second part of routed environment and check that exception
+# is created with the expected PMTU.
+#
# - pmtu_vti6_exception
# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
# namespaces with matching endpoints. Check that route exception is
@@ -125,6 +135,13 @@
# decrease and increase MTU of tunnel, checking that route exception PMTU
# changes accordingly
#
+# - pmtu_vti6_udp_exception
+# Same as pmtu_vti6_exception, but using ESP-in-UDP
+#
+# - pmtu_vti6_udp_routed_exception
+# Same as pmtu_vti6_udp_routed_exception but with routing between vti
+# endpoints
+#
# - pmtu_vti4_default_mtu
# Set up vti4 tunnel on top of veth, in two namespaces with matching
# endpoints. Check that MTU assigned to vti interface is the MTU of the
@@ -224,6 +241,10 @@ tests="
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_vti6_udp_exception vti6: PMTU exceptions (ESP-in-UDP) 0
+ pmtu_vti4_udp_exception vti4: PMTU exceptions (ESP-in-UDP) 0
+ pmtu_vti6_udp_routed_exception vti6: PMTU exceptions, routed (ESP-in-UDP) 0
+ pmtu_vti4_udp_routed_exception vti4: PMTU exceptions, routed (ESP-in-UDP) 0
pmtu_vti4_default_mtu vti4: default MTU assignment 0
pmtu_vti6_default_mtu vti6: default MTU assignment 0
pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0
@@ -246,7 +267,6 @@ ns_b="ip netns exec ${NS_B}"
ns_c="ip netns exec ${NS_C}"
ns_r1="ip netns exec ${NS_R1}"
ns_r2="ip netns exec ${NS_R2}"
-
# Addressing and routing for tests with routers: four network segments, with
# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
@@ -279,7 +299,6 @@ routes="
A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2
B default ${prefix6}:${b_r1}::2
"
-
USE_NH="no"
# ns family nh id destination gateway
nexthops="
@@ -326,6 +345,7 @@ dummy6_mask="64"
err_buf=
tcpdump_pids=
+nettest_pids=
err() {
err_buf="${err_buf}${1}
@@ -548,6 +568,14 @@ setup_vti6() {
setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
}
+setup_vti4routed() {
+ setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
+}
+
+setup_vti6routed() {
+ setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
+}
+
setup_vxlan_or_geneve() {
type="${1}"
a_addr="${2}"
@@ -619,18 +647,36 @@ setup_xfrm() {
proto=${1}
veth_a_addr="${2}"
veth_b_addr="${3}"
+ encap=${4}
- run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1
- run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
+ run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} || return 1
+ run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
run_cmd ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
run_cmd ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
- run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
- run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
+ run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
+ run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
run_cmd ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
run_cmd ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
}
+setup_nettest_xfrm() {
+ which nettest >/dev/null
+ if [ $? -ne 0 ]; then
+ echo "'nettest' command not found; skipping tests"
+ return 1
+ fi
+
+ [ ${1} -eq 6 ] && proto="-6" || proto=""
+ port=${2}
+
+ run_cmd ${ns_a} nettest ${proto} -q -D -s -x -p ${port} -t 5 &
+ nettest_pids="${nettest_pids} $!"
+
+ run_cmd ${ns_b} nettest ${proto} -q -D -s -x -p ${port} -t 5 &
+ nettest_pids="${nettest_pids} $!"
+}
+
setup_xfrm4() {
setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
}
@@ -639,6 +685,26 @@ setup_xfrm6() {
setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
}
+setup_xfrm4udp() {
+ setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0"
+ setup_nettest_xfrm 4 4500
+}
+
+setup_xfrm6udp() {
+ setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0"
+ setup_nettest_xfrm 6 4500
+}
+
+setup_xfrm4udprouted() {
+ setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0"
+ setup_nettest_xfrm 4 4500
+}
+
+setup_xfrm6udprouted() {
+ setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0"
+ setup_nettest_xfrm 6 4500
+}
+
setup_routing_old() {
for i in ${routes}; do
[ "${ns}" = "" ] && ns="${i}" && continue
@@ -823,6 +889,11 @@ cleanup() {
done
tcpdump_pids=
+ for pid in ${nettest_pids}; do
+ kill ${pid}
+ done
+ nettest_pids=
+
for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
ip netns del ${n} 2> /dev/null
done
@@ -1432,6 +1503,135 @@ test_pmtu_vti6_exception() {
return ${fail}
}
+test_pmtu_vti4_udp_exception() {
+ setup namespaces veth vti4 xfrm4udp || return $ksft_skip
+ trace "${ns_a}" veth_a "${ns_b}" veth_b \
+ "${ns_a}" vti4_a "${ns_b}" vti4_b
+
+ veth_mtu=1500
+ vti_mtu=$((veth_mtu - 20))
+
+ # UDP SPI SN IV ICV pad length next header
+ esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
+ ping_payload=$((esp_payload_rfc4106 - 28))
+
+ mtu "${ns_a}" veth_a ${veth_mtu}
+ mtu "${ns_b}" veth_b ${veth_mtu}
+ mtu "${ns_a}" vti4_a ${vti_mtu}
+ mtu "${ns_b}" vti4_b ${vti_mtu}
+
+ # Send DF packet without exceeding link layer MTU, check that no
+ # exception is created
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
+
+ # Now exceed link layer MTU by one byte, check that exception is created
+ # with the right PMTU value
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
+}
+
+test_pmtu_vti6_udp_exception() {
+ setup namespaces veth vti6 xfrm6udp || return $ksft_skip
+ trace "${ns_a}" veth_a "${ns_b}" veth_b \
+ "${ns_a}" vti6_a "${ns_b}" vti6_b
+ fail=0
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_a 4000
+ mtu "${ns_b}" veth_b 4000
+ mtu "${ns_a}" vti6_a 5000
+ mtu "${ns_b}" vti6_b 5000
+ run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
+
+ # Check that exception was created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
+
+ # Decrease tunnel MTU, check for PMTU decrease in route exception
+ mtu "${ns_a}" vti6_a 3000
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
+
+ # Increase tunnel MTU, check for PMTU increase in route exception
+ mtu "${ns_a}" vti6_a 9000
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
+
+ return ${fail}
+}
+
+test_pmtu_vti4_udp_routed_exception() {
+ setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip
+ trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
+ "${ns_a}" vti4_a "${ns_b}" vti4_b
+
+ veth_mtu=1500
+ vti_mtu=$((veth_mtu - 20))
+
+ # UDP SPI SN IV ICV pad length next header
+ esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
+ ping_payload=$((esp_payload_rfc4106 - 28))
+
+ mtu "${ns_a}" veth_A-R1 ${veth_mtu}
+ mtu "${ns_r1}" veth_R1-A ${veth_mtu}
+ mtu "${ns_b}" veth_B-R1 ${veth_mtu}
+ mtu "${ns_r1}" veth_R1-B ${veth_mtu}
+
+ mtu "${ns_a}" vti4_a ${vti_mtu}
+ mtu "${ns_b}" vti4_b ${vti_mtu}
+
+ # Send DF packet without exceeding link layer MTU, check that no
+ # exception is created
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
+
+ # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
+ # with the right PMTU value
+ mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
+}
+
+test_pmtu_vti6_udp_routed_exception() {
+ setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip
+ trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
+ "${ns_a}" vti6_a "${ns_b}" vti6_b
+
+ veth_mtu=1500
+ vti_mtu=$((veth_mtu - 40))
+
+ # UDP SPI SN IV ICV pad length next header
+ esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
+ ping_payload=$((esp_payload_rfc4106 - 48))
+
+ mtu "${ns_a}" veth_A-R1 ${veth_mtu}
+ mtu "${ns_r1}" veth_R1-A ${veth_mtu}
+ mtu "${ns_b}" veth_B-R1 ${veth_mtu}
+ mtu "${ns_r1}" veth_R1-B ${veth_mtu}
+
+ # mtu "${ns_a}" vti6_a ${vti_mtu}
+ # mtu "${ns_b}" vti6_b ${vti_mtu}
+
+ run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr}
+
+ # Check that exception was not created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
+
+ # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
+ # with the right PMTU value
+ mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
+ run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
+
+}
+
test_pmtu_vti4_default_mtu() {
setup namespaces veth vti4 || return $ksft_skip
--
2.18.4
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