Returns the internal linux bridge flags, was written in order to inspect whether BROPT_MTU_SET_BY_USER was set for a given bridge.

bridge_flags.py

root@mtutest:~# cat bridge_flags.py 
#!/usr/local/bin/drgn -k

# Usage: ./bridge_flags.py bridge_interface_name
#
# Returns the internal bridge flags, was written in order to inspect whether
# BROPT_MTU_SET_BY_USER was set for a given bridge.

import sys
from drgn import NULL, Object, cast, container_of, execscript, offsetof, reinterpret, sizeof
from drgn.helpers.common import *
from drgn.helpers.linux import *
from drgn.helpers.linux import net

if len(sys.argv) != 2:
    print(f"Usage: {sys.argv[0]} bridge_interface_name")
    sys.exit(1)

bridge_intf = net.netdev_get_by_name(prog, sys.argv[1])

bridge = Object(prog, "struct net_bridge", address=net.netdev_priv(bridge_intf))

print(sys.argv[1]+":", decode_enum_type_flags(bridge.options, prog.type('enum net_bridge_opts')))