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libpfctl: grow request buffer on ENOSPC

Description

libpfctl: grow request buffer on ENOSPC

When we issue a request to pf and expect a serialised nvlist as a reply
we have to supply a suitable buffer to the kernel.
The required size for this buffer is difficult to predict, and may be
(slightly) different from request to request.
If it's insufficient the kernel will return ENOSPC. Teach libpfctl to
catch this and send the request again with a larger buffer.

MFC after: 2 weeks
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D34908

(cherry picked from commit 7ed19f5c7780ebe9ec67121f0c5aa19fbc80bf1a)

Details

Provenance
kpAuthored on Apr 14 2022, 12:08 PM
Differential Revision
D34908: libpfctl: grow request buffer on ENOSPC
Parents
rGeed3a36c5475: pfctl: fix recursive printing of rules
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