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 The delayed INIT_ACK should be dropped in nf_conntrack_proto_sctp instead of updating the vtag with the out-of-date init_tag, otherwise, the vtag in DATA chunks later sent by client don't match the vtag in the conntrack entry and the DATA chunks get dropped.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>
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@ -6,13 +6,14 @@ TEST_PROGS := nft_trans_stress.sh nft_fib.sh nft_nat.sh bridge_brouter.sh \
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nft_concat_range.sh nft_conntrack_helper.sh \
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nft_queue.sh nft_meta.sh nf_nat_edemux.sh \
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ipip-conntrack-mtu.sh conntrack_tcp_unreplied.sh \
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conntrack_vrf.sh nft_synproxy.sh rpath.sh nft_audit.sh
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conntrack_vrf.sh nft_synproxy.sh rpath.sh nft_audit.sh \
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conntrack_sctp_collision.sh
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HOSTPKG_CONFIG := pkg-config
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CFLAGS += $(shell $(HOSTPKG_CONFIG) --cflags libmnl 2>/dev/null)
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LDLIBS += $(shell $(HOSTPKG_CONFIG) --libs libmnl 2>/dev/null || echo -lmnl)
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TEST_GEN_FILES = nf-queue connect_close audit_logread
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TEST_GEN_FILES = nf-queue connect_close audit_logread sctp_collision
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include ../lib.mk
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@ -0,0 +1,89 @@
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Testing For SCTP COLLISION SCENARIO as Below:
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#
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# 14:35:47.655279 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT] [init tag: 2017837359]
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# 14:35:48.353250 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT] [init tag: 1187206187]
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# 14:35:48.353275 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT ACK] [init tag: 2017837359]
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# 14:35:48.353283 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [COOKIE ECHO]
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# 14:35:48.353977 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [COOKIE ACK]
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# 14:35:48.855335 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT ACK] [init tag: 164579970]
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#
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# TOPO: SERVER_NS (link0)<--->(link1) ROUTER_NS (link2)<--->(link3) CLIENT_NS
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CLIENT_NS=$(mktemp -u client-XXXXXXXX)
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CLIENT_IP="198.51.200.1"
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CLIENT_PORT=1234
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SERVER_NS=$(mktemp -u server-XXXXXXXX)
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SERVER_IP="198.51.100.1"
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SERVER_PORT=1234
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ROUTER_NS=$(mktemp -u router-XXXXXXXX)
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CLIENT_GW="198.51.200.2"
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SERVER_GW="198.51.100.2"
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# setup the topo
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setup() {
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ip net add $CLIENT_NS
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ip net add $SERVER_NS
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ip net add $ROUTER_NS
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ip -n $SERVER_NS link add link0 type veth peer name link1 netns $ROUTER_NS
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ip -n $CLIENT_NS link add link3 type veth peer name link2 netns $ROUTER_NS
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ip -n $SERVER_NS link set link0 up
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ip -n $SERVER_NS addr add $SERVER_IP/24 dev link0
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ip -n $SERVER_NS route add $CLIENT_IP dev link0 via $SERVER_GW
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ip -n $ROUTER_NS link set link1 up
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ip -n $ROUTER_NS link set link2 up
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ip -n $ROUTER_NS addr add $SERVER_GW/24 dev link1
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ip -n $ROUTER_NS addr add $CLIENT_GW/24 dev link2
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ip net exec $ROUTER_NS sysctl -wq net.ipv4.ip_forward=1
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ip -n $CLIENT_NS link set link3 up
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ip -n $CLIENT_NS addr add $CLIENT_IP/24 dev link3
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ip -n $CLIENT_NS route add $SERVER_IP dev link3 via $CLIENT_GW
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# simulate the delay on OVS upcall by setting up a delay for INIT_ACK with
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# tc on $SERVER_NS side
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tc -n $SERVER_NS qdisc add dev link0 root handle 1: htb
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tc -n $SERVER_NS class add dev link0 parent 1: classid 1:1 htb rate 100mbit
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tc -n $SERVER_NS filter add dev link0 parent 1: protocol ip u32 match ip protocol 132 \
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0xff match u8 2 0xff at 32 flowid 1:1
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tc -n $SERVER_NS qdisc add dev link0 parent 1:1 handle 10: netem delay 1200ms
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# simulate the ctstate check on OVS nf_conntrack
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ip net exec $ROUTER_NS iptables -A FORWARD -m state --state INVALID,UNTRACKED -j DROP
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ip net exec $ROUTER_NS iptables -A INPUT -p sctp -j DROP
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# use a smaller number for assoc's max_retrans to reproduce the issue
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modprobe sctp
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ip net exec $CLIENT_NS sysctl -wq net.sctp.association_max_retrans=3
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}
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cleanup() {
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ip net exec $CLIENT_NS pkill sctp_collision 2>&1 >/dev/null
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ip net exec $SERVER_NS pkill sctp_collision 2>&1 >/dev/null
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ip net del "$CLIENT_NS"
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ip net del "$SERVER_NS"
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ip net del "$ROUTER_NS"
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}
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do_test() {
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ip net exec $SERVER_NS ./sctp_collision server \
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$SERVER_IP $SERVER_PORT $CLIENT_IP $CLIENT_PORT &
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ip net exec $CLIENT_NS ./sctp_collision client \
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$CLIENT_IP $CLIENT_PORT $SERVER_IP $SERVER_PORT
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}
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# NOTE: one way to work around the issue is set a smaller hb_interval
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# ip net exec $CLIENT_NS sysctl -wq net.sctp.hb_interval=3500
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# run the test case
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trap cleanup EXIT
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setup && \
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echo "Test for SCTP Collision in nf_conntrack:" && \
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do_test && echo "PASS!"
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exit $?
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@ -0,0 +1,99 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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int main(int argc, char *argv[])
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{
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struct sockaddr_in saddr = {}, daddr = {};
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int sd, ret, len = sizeof(daddr);
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struct timeval tv = {25, 0};
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char buf[] = "hello";
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if (argc != 6 || (strcmp(argv[1], "server") && strcmp(argv[1], "client"))) {
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printf("%s <server|client> <LOCAL_IP> <LOCAL_PORT> <REMOTE_IP> <REMOTE_PORT>\n",
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argv[0]);
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return -1;
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}
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sd = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
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if (sd < 0) {
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printf("Failed to create sd\n");
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return -1;
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}
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saddr.sin_family = AF_INET;
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saddr.sin_addr.s_addr = inet_addr(argv[2]);
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saddr.sin_port = htons(atoi(argv[3]));
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ret = bind(sd, (struct sockaddr *)&saddr, sizeof(saddr));
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if (ret < 0) {
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printf("Failed to bind to address\n");
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goto out;
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}
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ret = listen(sd, 5);
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if (ret < 0) {
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printf("Failed to listen on port\n");
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goto out;
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}
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daddr.sin_family = AF_INET;
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daddr.sin_addr.s_addr = inet_addr(argv[4]);
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daddr.sin_port = htons(atoi(argv[5]));
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/* make test shorter than 25s */
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ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
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if (ret < 0) {
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printf("Failed to setsockopt SO_RCVTIMEO\n");
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goto out;
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}
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if (!strcmp(argv[1], "server")) {
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sleep(1); /* wait a bit for client's INIT */
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ret = connect(sd, (struct sockaddr *)&daddr, len);
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if (ret < 0) {
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printf("Failed to connect to peer\n");
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goto out;
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}
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ret = recvfrom(sd, buf, sizeof(buf), 0, (struct sockaddr *)&daddr, &len);
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if (ret < 0) {
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printf("Failed to recv msg %d\n", ret);
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goto out;
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}
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ret = sendto(sd, buf, strlen(buf) + 1, 0, (struct sockaddr *)&daddr, len);
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if (ret < 0) {
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printf("Failed to send msg %d\n", ret);
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goto out;
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}
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printf("Server: sent! %d\n", ret);
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}
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if (!strcmp(argv[1], "client")) {
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usleep(300000); /* wait a bit for server's listening */
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ret = connect(sd, (struct sockaddr *)&daddr, len);
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if (ret < 0) {
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printf("Failed to connect to peer\n");
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goto out;
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}
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sleep(1); /* wait a bit for server's delayed INIT_ACK to reproduce the issue */
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ret = sendto(sd, buf, strlen(buf) + 1, 0, (struct sockaddr *)&daddr, len);
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if (ret < 0) {
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printf("Failed to send msg %d\n", ret);
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goto out;
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}
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ret = recvfrom(sd, buf, sizeof(buf), 0, (struct sockaddr *)&daddr, &len);
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if (ret < 0) {
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printf("Failed to recv msg %d\n", ret);
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goto out;
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}
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printf("Client: rcvd! %d\n", ret);
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}
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ret = 0;
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out:
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close(sd);
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return ret;
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}
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