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Commit a8a388c2 authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
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selftests: netfilter: add packetdrill based conntrack tests 

Add a new test script that uses packetdrill tool to exercise conntrack
state machine.

Needs ip/ip6tables and conntrack tool (to check if we have an entry in
the expected state).

Test cases added here cover following scenarios:
1. already-acked (retransmitted) packets are not tagged as INVALID
2. RST packet coming when conntrack is already closing (FIN/CLOSE_WAIT)
  transitions conntrack to CLOSE even if the RST is not an exact match
3. RST packets with out-of-window sequence numbers are marked as INVALID
4. SYN+Challenge ACK: check that challenge ack is allowed to pass
5. Old SYN/ACK: check conntrack handles the case where SYN is answered
  with SYN/ACK for an old, previous connection attempt
6. Check SYN reception while in ESTABLISHED state generates a challenge
   ack, RST response clears 'outdated' state + next SYN retransmit gets
   us into 'SYN_RECV' conntrack state.

Tests get run twice, once with ipv4 and once with ipv6.
Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 532aec7e
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tools/testing/selftests/net/netfilter/Makefile
View file @ a8a388c2
......@@ -13,6 +13,7 @@ TEST_PROGS += conntrack_tcp_unreplied.sh
TEST_PROGS += conntrack_sctp_collision.sh
TEST_PROGS += conntrack_vrf.sh
TEST_PROGS += ipvs.sh
TEST_PROGS += nf_conntrack_packetdrill.sh
TEST_PROGS += nf_nat_edemux.sh
TEST_PROGS += nft_audit.sh
TEST_PROGS += nft_concat_range.sh
......@@ -45,6 +46,7 @@ $(OUTPUT)/conntrack_dump_flush: CFLAGS += $(MNL_CFLAGS)
$(OUTPUT)/conntrack_dump_flush: LDLIBS += $(MNL_LDLIBS)
TEST_FILES := lib.sh
TEST_FILES += packetdrill
TEST_INCLUDES := \
../lib.sh
tools/testing/selftests/net/netfilter/config
View file @ a8a388c2
......@@ -86,3 +86,4 @@ CONFIG_VLAN_8021Q=m
CONFIG_XFRM_USER=m
CONFIG_XFRM_STATISTICS=y
CONFIG_NET_PKTGEN=m
CONFIG_TUN=m
tools/testing/selftests/net/netfilter/nf_conntrack_packetdrill.sh 0 → 100755
View file @ a8a388c2
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
source lib.sh
checktool "conntrack --version" "run test without conntrack"
checktool "iptables --version" "run test without iptables"
checktool "ip6tables --version" "run test without ip6tables"
modprobe -q tun
modprobe -q nf_conntrack
# echo 1 > /proc/sys/net/netfilter/nf_log_all_netns
PDRILL_TIMEOUT=10
files="
conntrack_ack_loss_stall.pkt
conntrack_inexact_rst.pkt
conntrack_syn_challenge_ack.pkt
conntrack_synack_old.pkt
conntrack_synack_reuse.pkt
conntrack_rst_invalid.pkt
"
if ! packetdrill --dry_run --verbose "packetdrill/conntrack_ack_loss_stall.pkt";then
echo "SKIP: packetdrill not installed"
exit ${ksft_skip}
fi
ret=0
run_packetdrill()
{
filename="$1"
ipver="$2"
local mtu=1500
export NFCT_IP_VERSION="$ipver"
if [ "$ipver" = "ipv4" ];then
export xtables="iptables"
elif [ "$ipver" = "ipv6" ];then
export xtables="ip6tables"
mtu=1520
fi
timeout "$PDRILL_TIMEOUT" unshare -n packetdrill --ip_version="$ipver" --mtu=$mtu \
--tolerance_usecs=1000000 --non_fatal packet "$filename"
}
run_one_test_file()
{
filename="$1"
for v in ipv4 ipv6;do
printf "%-50s(%s)%-20s" "$filename" "$v" ""
if run_packetdrill packetdrill/"$f" "$v";then
echo OK
else
echo FAIL
ret=1
fi
done
}
echo "Replaying packetdrill test cases:"
for f in $files;do
run_one_test_file packetdrill/"$f"
done
exit $ret
tools/testing/selftests/net/netfilter/packetdrill/common.sh 0 → 100755
View file @ a8a388c2
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# for debugging set net.netfilter.nf_log_all_netns=1 in init_net
# or do not use net namespaces.
modprobe -q nf_conntrack
sysctl -q net.netfilter.nf_conntrack_log_invalid=6
# Flush old cached data (fastopen cookies).
ip tcp_metrics flush all > /dev/null 2>&1
# TCP min, default, and max receive and send buffer sizes.
sysctl -q net.ipv4.tcp_rmem="4096 540000 $((15*1024*1024))"
sysctl -q net.ipv4.tcp_wmem="4096 $((256*1024)) 4194304"
# TCP congestion control.
sysctl -q net.ipv4.tcp_congestion_control=cubic
# TCP slow start after idle.
sysctl -q net.ipv4.tcp_slow_start_after_idle=0
# TCP Explicit Congestion Notification (ECN)
sysctl -q net.ipv4.tcp_ecn=0
sysctl -q net.ipv4.tcp_notsent_lowat=4294967295 > /dev/null 2>&1
# Override the default qdisc on the tun device.
# Many tests fail with timing errors if the default
# is FQ and that paces their flows.
tc qdisc add dev tun0 root pfifo
# Enable conntrack
$xtables -A INPUT -m conntrack --ctstate NEW -p tcp --syn
tools/testing/selftests/net/netfilter/packetdrill/conntrack_ack_loss_stall.pkt 0 → 100644
View file @ a8a388c2
// check that already-acked (retransmitted) packet is let through rather
// than tagged as INVALID.
`packetdrill/common.sh`
// should set -P DROP but it disconnects VM w.o. extra netns
+0 `$xtables -A INPUT -m conntrack --ctstate INVALID -j DROP`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 10) = 0
+0 < S 0:0(0) win 32792 <mss 1000>
+0 > S. 0:0(0) ack 1 <mss 1460>
+.01 < . 1:1(0) ack 1 win 65535
+0 accept(3, ..., ...) = 4
+0.0001 < P. 1:1461(1460) ack 1 win 257
+.0 > . 1:1(0) ack 1461 win 65535
+0.0001 < P. 1461:2921(1460) ack 1 win 257
+.0 > . 1:1(0) ack 2921 win 65535
+0.0001 < P. 2921:4381(1460) ack 1 win 257
+.0 > . 1:1(0) ack 4381 win 65535
+0.0001 < P. 4381:5841(1460) ack 1 win 257
+.0 > . 1:1(0) ack 5841 win 65535
+0.0001 < P. 5841:7301(1460) ack 1 win 257
+.0 > . 1:1(0) ack 7301 win 65535
+0.0001 < P. 7301:8761(1460) ack 1 win 257
+.0 > . 1:1(0) ack 8761 win 65535
+0.0001 < P. 8761:10221(1460) ack 1 win 257
+.0 > . 1:1(0) ack 10221 win 65535
+0.0001 < P. 10221:11681(1460) ack 1 win 257
+.0 > . 1:1(0) ack 11681 win 65535
+0.0001 < P. 11681:13141(1460) ack 1 win 257
+.0 > . 1:1(0) ack 13141 win 65535
+0.0001 < P. 13141:14601(1460) ack 1 win 257
+.0 > . 1:1(0) ack 14601 win 65535
+0.0001 < P. 14601:16061(1460) ack 1 win 257
+.0 > . 1:1(0) ack 16061 win 65535
+0.0001 < P. 16061:17521(1460) ack 1 win 257
+.0 > . 1:1(0) ack 17521 win 65535
+0.0001 < P. 17521:18981(1460) ack 1 win 257
+.0 > . 1:1(0) ack 18981 win 65535
+0.0001 < P. 18981:20441(1460) ack 1 win 257
+.0 > . 1:1(0) ack 20441 win 65535
+0.0001 < P. 20441:21901(1460) ack 1 win 257
+.0 > . 1:1(0) ack 21901 win 65535
+0.0001 < P. 21901:23361(1460) ack 1 win 257
+.0 > . 1:1(0) ack 23361 win 65535
+0.0001 < P. 23361:24821(1460) ack 1 win 257
0.055 > . 1:1(0) ack 24821 win 65535
+0.0001 < P. 24821:26281(1460) ack 1 win 257
+.0 > . 1:1(0) ack 26281 win 65535
+0.0001 < P. 26281:27741(1460) ack 1 win 257
+.0 > . 1:1(0) ack 27741 win 65535
+0.0001 < P. 27741:29201(1460) ack 1 win 257
+.0 > . 1:1(0) ack 29201 win 65535
+0.0001 < P. 29201:30661(1460) ack 1 win 257
+.0 > . 1:1(0) ack 30661 win 65535
+0.0001 < P. 30661:32121(1460) ack 1 win 257
+.0 > . 1:1(0) ack 32121 win 65535
+0.0001 < P. 32121:33581(1460) ack 1 win 257
+.0 > . 1:1(0) ack 33581 win 65535
+0.0001 < P. 33581:35041(1460) ack 1 win 257
+.0 > . 1:1(0) ack 35041 win 65535
+0.0001 < P. 35041:36501(1460) ack 1 win 257
+.0 > . 1:1(0) ack 36501 win 65535
+0.0001 < P. 36501:37961(1460) ack 1 win 257
+.0 > . 1:1(0) ack 37961 win 65535
+0.0001 < P. 37961:39421(1460) ack 1 win 257
+.0 > . 1:1(0) ack 39421 win 65535
+0.0001 < P. 39421:40881(1460) ack 1 win 257
+.0 > . 1:1(0) ack 40881 win 65535
+0.0001 < P. 40881:42341(1460) ack 1 win 257
+.0 > . 1:1(0) ack 42341 win 65535
+0.0001 < P. 42341:43801(1460) ack 1 win 257
+.0 > . 1:1(0) ack 43801 win 65535
+0.0001 < P. 43801:45261(1460) ack 1 win 257
+.0 > . 1:1(0) ack 45261 win 65535
+0.0001 < P. 45261:46721(1460) ack 1 win 257
+.0 > . 1:1(0) ack 46721 win 65535
+0.0001 < P. 46721:48181(1460) ack 1 win 257
+.0 > . 1:1(0) ack 48181 win 65535
+0.0001 < P. 48181:49641(1460) ack 1 win 257
+.0 > . 1:1(0) ack 49641 win 65535
+0.0001 < P. 49641:51101(1460) ack 1 win 257
+.0 > . 1:1(0) ack 51101 win 65535
+0.0001 < P. 51101:52561(1460) ack 1 win 257
+.0 > . 1:1(0) ack 52561 win 65535
+0.0001 < P. 52561:54021(1460) ack 1 win 257
+.0 > . 1:1(0) ack 54021 win 65535
+0.0001 < P. 54021:55481(1460) ack 1 win 257
+.0 > . 1:1(0) ack 55481 win 65535
+0.0001 < P. 55481:56941(1460) ack 1 win 257
+.0 > . 1:1(0) ack 56941 win 65535
+0.0001 < P. 56941:58401(1460) ack 1 win 257
+.0 > . 1:1(0) ack 58401 win 65535
+0.0001 < P. 58401:59861(1460) ack 1 win 257
+.0 > . 1:1(0) ack 59861 win 65535
+0.0001 < P. 59861:61321(1460) ack 1 win 257
+.0 > . 1:1(0) ack 61321 win 65535
+0.0001 < P. 61321:62781(1460) ack 1 win 257
+.0 > . 1:1(0) ack 62781 win 65535
+0.0001 < P. 62781:64241(1460) ack 1 win 257
+.0 > . 1:1(0) ack 64241 win 65535
+0.0001 < P. 64241:65701(1460) ack 1 win 257
+.0 > . 1:1(0) ack 65701 win 65535
+0.0001 < P. 65701:67161(1460) ack 1 win 257
+.0 > . 1:1(0) ack 67161 win 65535
// nf_ct_proto_6: SEQ is under the lower bound (already ACKed data retransmitted) IN=tun0 OUT= MAC= SRC=192.0.2.1 DST=192.168.24.72 LEN=1500 TOS=0x00 PREC=0x00 TTL=255 ID=0 PROTO=TCP SPT=34375 DPT=8080 SEQ=1 ACK=4162510439 WINDOW=257 RES=0x00 ACK PSH URGP=0
+0.0001 < P. 1:1461(1460) ack 1 win 257
// only sent if above packet isn't flagged as invalid
+.0 > . 1:1(0) ack 67161 win 65535
+0 `$xtables -D INPUT -m conntrack --ctstate INVALID -j DROP`
tools/testing/selftests/net/netfilter/packetdrill/conntrack_inexact_rst.pkt 0 → 100644
View file @ a8a388c2
// check RST packet that doesn't exactly match expected next sequence
// number still transitions conntrack state to CLOSE iff its already in
// FIN/CLOSE_WAIT.
`packetdrill/common.sh`
// 5.771921 server_ip > client_ip TLSv1.2 337 [Packet size limited during capture]
// 5.771994 server_ip > client_ip TLSv1.2 337 [Packet size limited during capture]
// 5.772212 client_ip > server_ip TCP 66 45020 > 443 [ACK] Seq=1905874048 Ack=781810658 Win=36352 Len=0 TSval=3317842872 TSecr=675936334
// 5.787924 server_ip > client_ip TLSv1.2 1300 [Packet size limited during capture]
// 5.788126 server_ip > client_ip TLSv1.2 90 Application Data
// 5.788207 server_ip > client_ip TCP 66 443 > 45020 [FIN, ACK] Seq=781811916 Ack=1905874048 Win=31104 Len=0 TSval=675936350 TSecr=3317842872
// 5.788447 client_ip > server_ip TLSv1.2 90 Application Data
// 5.788479 client_ip > server_ip TCP 66 45020 > 443 [RST, ACK] Seq=1905874072 Ack=781811917 Win=39040 Len=0 TSval=3317842889 TSecr=675936350
// 5.788581 server_ip > client_ip TCP 54 8443 > 45020 [RST] Seq=781811892 Win=0 Len=0
+0 `iptables -A INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `iptables -A OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
0.1 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
0.1 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>
+0.1 < S. 1:1(0) ack 1 win 65535 <mss 1460>
+0 > . 1:1(0) ack 1 win 65535
+0 < . 1:1001(1000) ack 1 win 65535
+0 < . 1001:2001(1000) ack 1 win 65535
+0 < . 2001:3001(1000) ack 1 win 65535
+0 > . 1:1(0) ack 1001 win 65535
+0 > . 1:1(0) ack 2001 win 65535
+0 > . 1:1(0) ack 3001 win 65535
+0 write(3, ..., 1000) = 1000
+0.0 > P. 1:1001(1000) ack 3001 win 65535
+0.1 read(3, ..., 1000) = 1000
// Conntrack should move to FIN_WAIT, then CLOSE_WAIT.
+0 < F. 3001:3001(0) ack 1001 win 65535
+0 > . 1001:1001(0) ack 3002 win 65535
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q CLOSE_WAIT`
+1 close(3) = 0
// RST: unread data. FIN was seen, hence ack + 1
+0 > R. 1001:1001(0) ack 3002 win 65535
// ... and then, CLOSE.
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q CLOSE\ `
// Spurious RST from peer -- no sk state. Should NOT get
// marked INVALID, because conntrack is already closing.
+0.1 < R 2001:2001(0) win 0
// No packets should have been marked INVALID
+0 `iptables -v -S INPUT | grep INVALID | grep -q -- "-c 0 0"`
+0 `iptables -v -S OUTPUT | grep INVALID | grep -q -- "-c 0 0"`
tools/testing/selftests/net/netfilter/packetdrill/conntrack_rst_invalid.pkt 0 → 100644
View file @ a8a388c2
// check that out of window resets are marked as INVALID and conntrack remains
// in ESTABLISHED state.
`packetdrill/common.sh`
+0 `$xtables -A INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `$xtables -A OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
0.1 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
0.1 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>
+0.1 < S. 1:1(0) ack 1 win 65535 <mss 1460>
+0 > . 1:1(0) ack 1 win 65535
+0 < . 1:1001(1000) ack 1 win 65535
+0 < . 1001:2001(1000) ack 1 win 65535
+0 < . 2001:3001(1000) ack 1 win 65535
+0 > . 1:1(0) ack 1001 win 65535
+0 > . 1:1(0) ack 2001 win 65535
+0 > . 1:1(0) ack 3001 win 65535
+0 write(3, ..., 1000) = 1000
// out of window
+0.0 < R 0:0(0) win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`
// out of window
+0.0 < R 1000000:1000000(0) win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`
// in-window but not exact match
+0.0 < R 42:42(0) win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`
+0.0 > P. 1:1001(1000) ack 3001 win 65535
+0.1 read(3, ..., 1000) = 1000
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`
+0 < . 3001:3001(0) ack 1001 win 65535
+0.0 < R. 3000:3000(0) ack 1001 win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`
// exact next sequence
+0.0 < R. 3001:3001(0) ack 1001 win 0
// Conntrack should move to CLOSE
// Expect four invalid RSTs
+0 `$xtables -v -S INPUT | grep INVALID | grep -q -- "-c 4 "`
+0 `$xtables -v -S OUTPUT | grep INVALID | grep -q -- "-c 0 0"`
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q CLOSE\ `
tools/testing/selftests/net/netfilter/packetdrill/conntrack_syn_challenge_ack.pkt 0 → 100644
View file @ a8a388c2
// Check connection re-use, i.e. peer that receives the SYN answers with
// a challenge-ACK.
// Check that conntrack lets all packets pass, including the challenge ack,
// and that a new connection is established.
`packetdrill/common.sh`
// S >
// . < (challnge-ack)
// R. >
// S >
// S. <
// Expected outcome: established connection.
+0 `$xtables -A INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `$xtables -A OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
0.1 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
0.1 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>
// Challenge ACK, old incarnation.
0.1 < . 145824453:145824453(0) ack 643160523 win 240 <mss 1460,nop,nop,TS val 1 ecr 1,nop,wscale 0>
+0.01 > R 643160523:643160523(0) win 0
+0.01 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null | grep UNREPLIED | grep -q SYN_SENT`
// Must go through.
+0.01 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>
// correct synack
+0.1 < S. 0:0(0) ack 1 win 250 <mss 1460,nop,nop,TS val 1 ecr 1,nop,wscale 0>
// 3whs completes.
+0.01 > . 1:1(0) ack 1 win 256 <nop,nop,TS val 1 ecr 1>
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null | grep ESTABLISHED | grep -q ASSURED`
// No packets should have been marked INVALID
+0 `$xtables -v -S INPUT | grep INVALID | grep -q -- "-c 0 0"`
+0 `$xtables -v -S OUTPUT | grep INVALID | grep -q -- "-c 0 0"`
tools/testing/selftests/net/netfilter/packetdrill/conntrack_synack_old.pkt 0 → 100644
View file @ a8a388c2
// Check conntrack copes with syn/ack reply for a previous, old incarnation.
// tcpdump with buggy sequence
// 10.176.25.8.829 > 10.192.171.30.2049: Flags [S], seq 2375731741, win 29200, options [mss 1460,sackOK,TS val 2083107423 ecr 0,nop,wscale 7], length 0
// OLD synack, for old/previous S
// 10.192.171.30.2049 > 10.176.25.8.829: Flags [S.], seq 145824453, ack 643160523, win 65535, options [mss 8952,nop,wscale 5,TS val 3215437785 ecr 2082921663,nop,nop], length 0
// This reset never makes it to the endpoint, elided in the packetdrill script
// 10.192.171.30.2049 > 10.176.25.8.829: Flags [R.], seq 1, ack 1, win 65535, options [mss 8952,nop,wscale 5,TS val 3215443451 ecr 2082921663,nop,nop], length 0
// Syn retransmit, no change
// 10.176.25.8.829 > 10.192.171.30.2049: Flags [S], seq 2375731741, win 29200, options [mss 1460,sackOK,TS val 2083115583 ecr 0,nop,wscale 7], length 0
// CORRECT synack, should be accepted, but conntrack classified this as INVALID:
// SEQ is over the upper bound (over the window of the receiver) IN=tun0 OUT= MAC= SRC=192.0.2.1 DST=192.168.37.78 LEN=40 TOS=0x00 PREC=0x00 TTL=255 ID=0 PROTO=TCP SPT=8080 DPT=34500 SEQ=162602411 ACK=2124350315 ..
// 10.192.171.30.2049 > 10.176.25.8.829: Flags [S.], seq 162602410, ack 2375731742, win 65535, options [mss 8952,nop,wscale 5,TS val 3215445754 ecr 2083115583,nop,nop], length 0
`packetdrill/common.sh`
+0 `$xtables -A INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `$xtables -A OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
0.1 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
0.1 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>
// bogus/outdated synack, invalid ack value
0.1 < S. 145824453:145824453(0) ack 643160523 win 240 <mss 1440,nop,nop,TS val 1 ecr 1,nop,wscale 0>
// syn retransmitted
1.01 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1015 ecr 0,nop,wscale 8>
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null | grep UNREPLIED | grep -q SYN_SENT`
// correct synack
+0 < S. 145758918:145758918(0) ack 1 win 250 <mss 1460,nop,nop,TS val 1 ecr 1,nop,wscale 0>
+0 write(3, ..., 1) = 1
// with buggy conntrack above packet is dropped, so SYN rtx is seen:
// script packet: 1.054007 . 1:1(0) ack 16777958 win 256 <nop,nop,TS val 1033 ecr 1>
// actual packet: 3.010000 S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1015 ecr 0,nop,wscale 8>
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null | grep ESTABLISHED | grep -q ASSURED`
+0 > P. 1:2(1) ack 4294901762 win 256 <nop,nop,TS val 1067 ecr 1>
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null | grep ASSURED | grep -q ESTABLISHED`
// No packets should have been marked INVALID in OUTPUT direction, 1 in INPUT
+0 `$xtables -v -S OUTPUT | grep INVALID | grep -q -- "-c 0 0"`
+0 `$xtables -v -S INPUT | grep INVALID | grep -q -- "-c 1 "`
+0 `$xtables -D INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `$xtables -D OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
tools/testing/selftests/net/netfilter/packetdrill/conntrack_synack_reuse.pkt 0 → 100644
View file @ a8a388c2
// Check reception of another SYN while we have an established conntrack state.
// Challenge ACK is supposed to pass through, RST reply should clear conntrack
// state and SYN retransmit should give us new 'SYN_RECV' connection state.
`packetdrill/common.sh`
// should show a match if bug is present:
+0 `iptables -A INPUT -m conntrack --ctstate INVALID -p tcp --tcp-flags SYN,ACK SYN,ACK`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 10) = 0
+0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7, TS val 1 ecr 0,nop,nop>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,TS val 100 ecr 1,nop,wscale 8>
+.01 < . 1:1(0) ack 1 win 257 <TS val 1 ecr 100,nop,nop>
+0 accept(3, ..., ...) = 4
+0 < P. 1:101(100) ack 1 win 257 <TS val 2 ecr 100,nop,nop>
+.001 > . 1:1(0) ack 101 win 256 <nop,nop,TS val 110 ecr 2>
+0 read(4, ..., 101) = 100
1.0 < S 2000:2000(0) win 32792 <mss 1000,nop,wscale 7, TS val 233 ecr 0,nop,nop>
// Won't expect this: challenge ack.
+0 > . 1:1(0) ack 101 win 256 <nop,nop,TS val 112 ecr 2>
+0 < R. 101:101(0) ack 1 win 257
+0 close(4) = 0
1.5 < S 2000:2000(0) win 32792 <mss 1000,nop,wscale 0, TS val 233 ecr 0,nop,nop>
+0 `conntrack -L -p tcp --dport 8080 2>/dev/null | grep -q SYN_RECV`
+0 `iptables -v -S INPUT | grep INVALID | grep -q -- "-c 0 0"`
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