git: f7e56b482606 - stable/12 - pf tests: Basic adaptive mode syncookie test

[Kristof Provost]

The branch stable/12 has been updated by kp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=f7e56b48260646f8b1d5d619a92ca1b2c2d26efc

commit f7e56b48260646f8b1d5d619a92ca1b2c2d26efc
Author:     Kristof Provost <k...@freebsd.org>
AuthorDate: 2021-09-25 13:05:02 +0000
Commit:     Kristof Provost <k...@freebsd.org>
CommitDate: 2021-10-06 08:46:58 +0000

    pf tests: Basic adaptive mode syncookie test
    
    MFC after:      1 week
    Sponsored by:   Modirum MDPay
    Differential Revision:  https://reviews.freebsd.org/D32139
    
    (cherry picked from commit 2f20d80692ceb584842a7642562fc9f610a5b661)
---
 tests/sys/netpfil/pf/syncookie.sh | 50 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/tests/sys/netpfil/pf/syncookie.sh 
b/tests/sys/netpfil/pf/syncookie.sh
index 8a4005d0fc6d..d85beac1a4d1 100644
--- a/tests/sys/netpfil/pf/syncookie.sh
+++ b/tests/sys/netpfil/pf/syncookie.sh
@@ -168,9 +168,59 @@ nostate_cleanup()
        pft_cleanup
 }
 
+atf_test_case "adaptive" "cleanup"
+adaptive_head()
+{
+       atf_set descr 'Adaptive mode test'
+       atf_set require.user root
+       atf_set require.progs scapy
+}
+
+adaptive_body()
+{
+       pft_init
+
+       epair=$(vnet_mkepair)
+       ifconfig ${epair}a 192.0.2.2/24 up
+
+       vnet_mkjail alcatraz ${epair}b
+       jexec alcatraz ifconfig ${epair}b 192.0.2.1/24 up
+
+       jexec alcatraz pfctl -e
+       pft_set_rules alcatraz \
+               "set limit states 100" \
+               "set syncookies adaptive (start 10%%, end 5%%)" \
+               "pass in" \
+               "pass out"
+
+       # Sanity check
+       atf_check -s exit:0 -o ignore ping -c 1 192.0.2.1
+
+       # Now syn flood to create many states
+       ${common_dir}/pft_synflood.py \
+               --sendif ${epair}a \
+               --to 192.0.2.2 \
+               --count 100
+
+       # Adaptive mode should kick in and stop us from creating more than
+       # about 10 states
+       states=$(jexec alcatraz pfctl -ss | grep tcp | wc -l)
+       if [ "$states" -gt 20 ];
+       then
+               echo "$states"
+               atf_fail "Found unexpected states"
+       fi
+}
+
+adaptive_cleanup()
+{
+       pft_cleanup
+}
+
 atf_init_test_cases()
 {
        atf_add_test_case "basic"
        atf_add_test_case "forward"
        atf_add_test_case "nostate"
+       atf_add_test_case "adaptive"
 }