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

   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'