selftests: netfilter: test for sctp collision processing in nf_conntrack

This patch adds a test case to reproduce the SCTP DATA chunk retransmission
timeout issue caused by the improper SCTP collision processing in netfilter
nf_conntrack_proto_sctp.

In this test, client sends a INIT chunk, but the INIT_ACK replied from
server is delayed until the server sends a INIT chunk to start a new
connection from its side. After the connection is complete from server
side, the delayed INIT_ACK arrives in nf_conntrack_proto_sctp.

The delayed INIT_ACK should be dropped in nf_conntrack_proto_sctp instead
of updating the vtag with the out-of-date init_tag, otherwise, the vtag
in DATA chunks later sent by client don't match the vtag in the conntrack
entry and the DATA chunks get dropped.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

diff --git a/tools/testing/selftests/netfilter/Makefile b/tools/testing/selftests/netfilter/Makefile
index 321db88..ef90aca 100644 (file)
--- a/tools/testing/selftests/netfilter/Makefile
+++ b/tools/testing/selftests/netfilter/Makefile
@@ -6,13 +6,14 @@ TEST_PROGS := nft_trans_stress.sh nft_fib.sh nft_nat.sh bridge_brouter.sh \
        nft_concat_range.sh nft_conntrack_helper.sh \
        nft_queue.sh nft_meta.sh nf_nat_edemux.sh \
        ipip-conntrack-mtu.sh conntrack_tcp_unreplied.sh \
-       conntrack_vrf.sh nft_synproxy.sh rpath.sh nft_audit.sh
+       conntrack_vrf.sh nft_synproxy.sh rpath.sh nft_audit.sh \
+       conntrack_sctp_collision.sh
 
 HOSTPKG_CONFIG := pkg-config
 
 CFLAGS += $(shell $(HOSTPKG_CONFIG) --cflags libmnl 2>/dev/null)
 LDLIBS += $(shell $(HOSTPKG_CONFIG) --libs libmnl 2>/dev/null || echo -lmnl)
 
-TEST_GEN_FILES =  nf-queue connect_close audit_logread
+TEST_GEN_FILES =  nf-queue connect_close audit_logread sctp_collision
 
 include ../lib.mk

diff --git a/tools/testing/selftests/netfilter/conntrack_sctp_collision.sh b/tools/testing/selftests/netfilter/conntrack_sctp_collision.sh
new file mode 100755 (executable)
index 0000000..a924e59
--- /dev/null
+++ b/tools/testing/selftests/netfilter/conntrack_sctp_collision.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Testing For SCTP COLLISION SCENARIO as Below:
+#
+#   14:35:47.655279 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT] [init tag: 2017837359]
+#   14:35:48.353250 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT] [init tag: 1187206187]
+#   14:35:48.353275 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT ACK] [init tag: 2017837359]
+#   14:35:48.353283 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [COOKIE ECHO]
+#   14:35:48.353977 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [COOKIE ACK]
+#   14:35:48.855335 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT ACK] [init tag: 164579970]
+#
+# TOPO: SERVER_NS (link0)<--->(link1) ROUTER_NS (link2)<--->(link3) CLIENT_NS
+
+CLIENT_NS=$(mktemp -u client-XXXXXXXX)
+CLIENT_IP="198.51.200.1"
+CLIENT_PORT=1234
+
+SERVER_NS=$(mktemp -u server-XXXXXXXX)
+SERVER_IP="198.51.100.1"
+SERVER_PORT=1234
+
+ROUTER_NS=$(mktemp -u router-XXXXXXXX)
+CLIENT_GW="198.51.200.2"
+SERVER_GW="198.51.100.2"
+
+# setup the topo
+setup() {
+       ip net add $CLIENT_NS
+       ip net add $SERVER_NS
+       ip net add $ROUTER_NS
+       ip -n $SERVER_NS link add link0 type veth peer name link1 netns $ROUTER_NS
+       ip -n $CLIENT_NS link add link3 type veth peer name link2 netns $ROUTER_NS
+
+       ip -n $SERVER_NS link set link0 up
+       ip -n $SERVER_NS addr add $SERVER_IP/24 dev link0
+       ip -n $SERVER_NS route add $CLIENT_IP dev link0 via $SERVER_GW
+
+       ip -n $ROUTER_NS link set link1 up
+       ip -n $ROUTER_NS link set link2 up
+       ip -n $ROUTER_NS addr add $SERVER_GW/24 dev link1
+       ip -n $ROUTER_NS addr add $CLIENT_GW/24 dev link2
+       ip net exec $ROUTER_NS sysctl -wq net.ipv4.ip_forward=1
+
+       ip -n $CLIENT_NS link set link3 up
+       ip -n $CLIENT_NS addr add $CLIENT_IP/24 dev link3
+       ip -n $CLIENT_NS route add $SERVER_IP dev link3 via $CLIENT_GW
+
+       # simulate the delay on OVS upcall by setting up a delay for INIT_ACK with
+       # tc on $SERVER_NS side
+       tc -n $SERVER_NS qdisc add dev link0 root handle 1: htb
+       tc -n $SERVER_NS class add dev link0 parent 1: classid 1:1 htb rate 100mbit
+       tc -n $SERVER_NS filter add dev link0 parent 1: protocol ip u32 match ip protocol 132 \
+               0xff match u8 2 0xff at 32 flowid 1:1
+       tc -n $SERVER_NS qdisc add dev link0 parent 1:1 handle 10: netem delay 1200ms
+
+       # simulate the ctstate check on OVS nf_conntrack
+       ip net exec $ROUTER_NS iptables -A FORWARD -m state --state INVALID,UNTRACKED -j DROP
+       ip net exec $ROUTER_NS iptables -A INPUT -p sctp -j DROP
+
+       # use a smaller number for assoc's max_retrans to reproduce the issue
+       modprobe sctp
+       ip net exec $CLIENT_NS sysctl -wq net.sctp.association_max_retrans=3
+}
+
+cleanup() {
+       ip net exec $CLIENT_NS pkill sctp_collision 2>&1 >/dev/null
+       ip net exec $SERVER_NS pkill sctp_collision 2>&1 >/dev/null
+       ip net del "$CLIENT_NS"
+       ip net del "$SERVER_NS"
+       ip net del "$ROUTER_NS"
+}
+
+do_test() {
+       ip net exec $SERVER_NS ./sctp_collision server \
+               $SERVER_IP $SERVER_PORT $CLIENT_IP $CLIENT_PORT &
+       ip net exec $CLIENT_NS ./sctp_collision client \
+               $CLIENT_IP $CLIENT_PORT $SERVER_IP $SERVER_PORT
+}
+
+# NOTE: one way to work around the issue is set a smaller hb_interval
+# ip net exec $CLIENT_NS sysctl -wq net.sctp.hb_interval=3500
+
+# run the test case
+trap cleanup EXIT
+setup && \
+echo "Test for SCTP Collision in nf_conntrack:" && \
+do_test && echo "PASS!"
+exit $?

diff --git a/tools/testing/selftests/netfilter/sctp_collision.c b/tools/testing/selftests/netfilter/sctp_collision.c
new file mode 100644 (file)
index 0000000..21bb1cf
--- /dev/null
+++ b/tools/testing/selftests/netfilter/sctp_collision.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+int main(int argc, char *argv[])
+{
+       struct sockaddr_in saddr = {}, daddr = {};
+       int sd, ret, len = sizeof(daddr);
+       struct timeval tv = {25, 0};
+       char buf[] = "hello";
+
+       if (argc != 6 || (strcmp(argv[1], "server") && strcmp(argv[1], "client"))) {
+               printf("%s <server|client> <LOCAL_IP> <LOCAL_PORT> <REMOTE_IP> <REMOTE_PORT>\n",
+                      argv[0]);
+               return -1;
+       }
+
+       sd = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
+       if (sd < 0) {
+               printf("Failed to create sd\n");
+               return -1;
+       }
+
+       saddr.sin_family = AF_INET;
+       saddr.sin_addr.s_addr = inet_addr(argv[2]);
+       saddr.sin_port = htons(atoi(argv[3]));
+
+       ret = bind(sd, (struct sockaddr *)&saddr, sizeof(saddr));
+       if (ret < 0) {
+               printf("Failed to bind to address\n");
+               goto out;
+       }
+
+       ret = listen(sd, 5);
+       if (ret < 0) {
+               printf("Failed to listen on port\n");
+               goto out;
+       }
+
+       daddr.sin_family = AF_INET;
+       daddr.sin_addr.s_addr = inet_addr(argv[4]);
+       daddr.sin_port = htons(atoi(argv[5]));
+
+       /* make test shorter than 25s */
+       ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+       if (ret < 0) {
+               printf("Failed to setsockopt SO_RCVTIMEO\n");
+               goto out;
+       }
+
+       if (!strcmp(argv[1], "server")) {
+               sleep(1); /* wait a bit for client's INIT */
+               ret = connect(sd, (struct sockaddr *)&daddr, len);
+               if (ret < 0) {
+                       printf("Failed to connect to peer\n");
+                       goto out;
+               }
+               ret = recvfrom(sd, buf, sizeof(buf), 0, (struct sockaddr *)&daddr, &len);
+               if (ret < 0) {
+                       printf("Failed to recv msg %d\n", ret);
+                       goto out;
+               }
+               ret = sendto(sd, buf, strlen(buf) + 1, 0, (struct sockaddr *)&daddr, len);
+               if (ret < 0) {
+                       printf("Failed to send msg %d\n", ret);
+                       goto out;
+               }
+               printf("Server: sent! %d\n", ret);
+       }
+
+       if (!strcmp(argv[1], "client")) {
+               usleep(300000); /* wait a bit for server's listening */
+               ret = connect(sd, (struct sockaddr *)&daddr, len);
+               if (ret < 0) {
+                       printf("Failed to connect to peer\n");
+                       goto out;
+               }
+               sleep(1); /* wait a bit for server's delayed INIT_ACK to reproduce the issue */
+               ret = sendto(sd, buf, strlen(buf) + 1, 0, (struct sockaddr *)&daddr, len);
+               if (ret < 0) {
+                       printf("Failed to send msg %d\n", ret);
+                       goto out;
+               }
+               ret = recvfrom(sd, buf, sizeof(buf), 0, (struct sockaddr *)&daddr, &len);
+               if (ret < 0) {
+                       printf("Failed to recv msg %d\n", ret);
+                       goto out;
+               }
+               printf("Client: rcvd! %d\n", ret);
+       }
+       ret = 0;
+out:
+       close(sd);
+       return ret;
+}