[Bug 271613] net/py-netif: interface flags incorrect, some flags missing

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 24 May 2023 16:58:41 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271613

            Bug ID: 271613
           Summary: net/py-netif: interface flags incorrect, some flags
                    missing
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bofh@freebsd.org
          Reporter: hartmut.brandt@dlr.de
             Flags: maintainer-feedback?(bofh@freebsd.org)
          Assignee: bofh@freebsd.org

The flags property of the NetworkInterface class produces bogus flags for the
upper half of ifru_flags. It looks like it is correctly defined in defs.pxd as
short ifru_flags[2]. The __get_flags() method returns just ifru_flags[0] and
ignores ifru_flags[1]. Unfortunately the short is sign expanded to uint32_t
which gives a bogus return value for the flags property.

I was not able to fix that. It looks like ifru_flags[1] reads always as 0. So
with correctly casting and adding the words, all the upper bits are 0.

There are also some flags missing which are defined in 14: IFF_NOGROUP and
IFF_NETLINK_1, IFF_NEEDSEPOCH, IFF_STICKYARP.

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