[Bug 241462] netgraph/ng_tag: Variable length data can not be set for all length

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241462

            Bug ID: 241462
           Summary: netgraph/ng_tag: Variable length data can not be set
                    for all length
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: lutz at donnerhacke.de

ng_tag does can operator on arbitary data of mbuf_tags.
This only works for any data sets.

+ mkpeer . tag t t
+ msg t sethookin { thisHook="t" tag_len=4 tag_data=[1] }

works. But the following does not:

+ msg t sethookin { thisHook="t" tag_len=1 tag_data=[1] }
ngctl: send msg: Invalid argument

Especially in the case of checking for mbuf_tag values, the length
of checked data is important.

The reason behind this behavior is, that the record size
is padded to the next multiple of the alignment. Therefore
it's sufficient to check for large enough data received.

Patch is in review D22140

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