1 #!/bin/bash -e
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # This test checks that the network buffer sysctls are present
5 # in a network namespaces, and that they are readonly.
6 
7 source lib.sh
8 
9 cleanup() {
10     cleanup_ns $test_ns
11 }
12 
13 trap cleanup EXIT
14 
15 fail() {
16 	echo "ERROR: $*" >&2
17 	exit 1
18 }
19 
20 setup_ns test_ns
21 
22 for sc in {r,w}mem_{default,max}; do
23 	# check that this is writable in a netns
24 	[ -w "/proc/sys/net/core/$sc" ] ||
25 		fail "$sc isn't writable in the init netns!"
26 
27 	# change the value in the host netns
28 	sysctl -qw "net.core.$sc=300000" ||
29 		fail "Can't write $sc in init netns!"
30 
31 	# check that the value is read from the init netns
32 	[ "$(ip netns exec $test_ns sysctl -n "net.core.$sc")" -eq 300000 ] ||
33 		fail "Value for $sc mismatch!"
34 
35 	# check that this isn't writable in a netns
36 	ip netns exec $test_ns [ -w "/proc/sys/net/core/$sc" ] &&
37 		fail "$sc is writable in a netns!"
38 done
39 
40 echo 'Test passed OK'
41