Commit 5b5233fb authored by Matteo Croce's avatar Matteo Croce Committed by Jakub Kicinski
Browse files

selftests: net: tests net.core.{r,w}mem_{default,max} sysctls in a netns 



Add a selftest which checks that the sysctl is present in a netns,
that the value is read from the init one, and that it's readonly.

Signed-off-by: default avatarMatteo Croce <teknoraver@meta.com>
Link: https://lore.kernel.org/r/20240530232722.45255-3-technoboy85@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 19249c07

tools/testing/selftests/net/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ TEST_PROGS += bind_bhash.sh 
TEST_PROGS += ip_local_port_range.sh

TEST_PROGS += rps_default_mask.sh

TEST_PROGS += big_tcp.sh

TEST_PROGS += netns-sysctl.sh

TEST_PROGS_EXTENDED := toeplitz_client.sh toeplitz.sh

TEST_GEN_FILES =  socket nettest

TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any

tools/testing/selftests/net/netns-sysctl.sh

0 → 100755
+40 −0
Original line number Diff line number Diff line 
#!/bin/bash -e

# SPDX-License-Identifier: GPL-2.0

#

# This test checks that the network buffer sysctls are present

# in a network namespaces, and that they are readonly.



source lib.sh



cleanup() {

    cleanup_ns $test_ns

}



trap cleanup EXIT



fail() {

	echo "ERROR: $*" >&2

	exit 1

}



setup_ns test_ns



for sc in {r,w}mem_{default,max}; do

	# check that this is writable in a netns

	[ -w "/proc/sys/net/core/$sc" ] ||

		fail "$sc isn't writable in the init netns!"



	# change the value in the host netns

	sysctl -qw "net.core.$sc=300000" ||

		fail "Can't write $sc in init netns!"



	# check that the value is read from the init netns

	[ "$(ip netns exec $test_ns sysctl -n "net.core.$sc")" -eq 300000 ] ||

		fail "Value for $sc mismatch!"



	# check that this isn't writable in a netns

	ip netns exec $test_ns [ -w "/proc/sys/net/core/$sc" ] &&

		fail "$sc is writable in a netns!"

done



echo 'Test passed OK'