[edraac]

In some scenarios, it might be useful to verify a network interface's flags such as (admin) up/down, loopback, multicast, etc. These flags are either set by the driver, kernel, or triggered by user space utilities, and are exposed by a sysfs entry via /sys/class/net//flags. The particular flags and their bit offset are defined in the kernel in include/uapi/linux/if.h.

The new cukinia_netif_has_flag wraps a check for these flags and PASS if the flag is set, FAIL otherwise. It takes the device name, the flag name as defined in the kernel's net_device_flags enum, and performs the bitwise operations required to verify if the flag is set.

Example:

cukinia_netif_has_flag ethsbc0 IFF_UP
not cukinia_netif_has_flag ethsbc0 IFF_LOOPBACK
cukinia_netif_has_flag ethsbc0 IFF_RUNNING

Output:

[PASS] Checking interface "ethsbc0" has IFF_UP flag
[PASS] Checking interface "ethsbc0" has NOT IFF_LOOPBACK flag [!]
[FAIL] Checking interface "ethsbc0" has IFF_RUNNING flag

[anakin-childerhose-sfl]

Thank you very much for your PR! I left a few comments but it looks pretty good so far!

[anakin4747]

Thanks, looks good to me!

[anakin-childerhose-sfl]

LGTM

[edraac]

@anakin-childerhose-sfl @anakin4747 the check failure seems unrelated to my latest changes, right?

[anakin-childerhose-sfl]

Yes, they do seem unrelated, I pulled your latest changes and they pass the tests on my side

[anakin-childerhose-sfl]

Actually I found the issue with the CI for the first failing test. echo -ne adds the -ne to the number with dash so the echo -ne in the mock needs to be replaced with printf:

$ docker run -it --rm ubuntu:24.04 /bin/dash 
$ value=$(echo -ne "0x1001")                                                                                                            
$ echo "$((value >> 0))"                                                                                                                  
/bin/dash: 2: Illegal number: -ne 0x1001
$ value=$(printf "0x1001")                                                                                                                
$ echo "$((value >> 0))"                                                                                                                  
4097