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: Matteo Croce teknoraver@meta.com --- tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/netns-sysctl.sh | 15 +++++++++++++++ 2 files changed, 16 insertions(+) create mode 100755 tools/testing/selftests/net/netns-sysctl.sh
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index bd01e4a0be2c..6da63d1831c1 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -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 diff --git a/tools/testing/selftests/net/netns-sysctl.sh b/tools/testing/selftests/net/netns-sysctl.sh new file mode 100755 index 000000000000..b948ba67b13a --- /dev/null +++ b/tools/testing/selftests/net/netns-sysctl.sh @@ -0,0 +1,15 @@ +#!/bin/bash -e + +for sc in {r,w}mem_{default,max}; do + # change the value in the host netns + sysctl -qw "net.core.$sc=300000" + + # check that the value is read from the init netns + [ "$(unshare -n sysctl -n "net.core.$sc")" -eq 300000 ] + + # check that this isn't writeable in a netns + ! unshare -n [ -w "/proc/sys/net/core/$sc" ] + ! unshare -n sysctl -w "net.core.$sc=100000" +done + +echo 'Test passed OK'