The manpage for `pf.conf(5)` references a "pflow(4) interface" both within the document and in the SEE ALSO section. However, there is no `pflow(4)` manpage and `apropos pflow` returns nothing. Asking on IRC turned up https://lists.freebsd.org/pipermail/freebsd-pf/2014-July/007409.html which references the port `net/pfflow` but there's no way I would have found that based on current docs within a fresh/stock base system. Is there something that can be done to make this clear in the docs? Perhaps reference `net/pfflow` in conjunction with the introduction to pflow?
You also find pflow mentioned in ObsoleteFiles.inc, # 20120908: pf cleanup OLD_FILES+=usr/include/net/if_pflow.h and sys/net/pfvar.h, /* was PFSTATE_PFLOW 0x04 */ I don't think the net/pflowd port is relevant, it is also marked as broken.
A commit references this bug: Author: kp Date: Sat Jan 5 05:50:16 UTC 2019 New revision: 342784 URL: https://svnweb.freebsd.org/changeset/base/342784 Log: pf: Remove references to pflow from the pf.conf man page pflow no longer exists. It was removed as part of a pf update back in 2012 (r240233). PR: 223957 MFC after: 1 week Changes: head/share/man/man5/pf.conf.5
A commit references this bug: Author: kp Date: Sat Jan 12 05:38:48 UTC 2019 New revision: 342955 URL: https://svnweb.freebsd.org/changeset/base/342955 Log: MFC r342784: pf: Remove references to pflow from the pf.conf man page pflow no longer exists. It was removed as part of a pf update back in 2012 (r240233). PR: 223957 Changes: _U stable/12/ stable/12/share/man/man5/pf.conf.5
A commit references this bug: Author: kp Date: Sat Jan 12 05:44:10 UTC 2019 New revision: 342956 URL: https://svnweb.freebsd.org/changeset/base/342956 Log: MFC r342784: pf: Remove references to pflow from the pf.conf man page pflow no longer exists. It was removed as part of a pf update back in 2012 (r240233). PR: 223957 Changes: _U stable/11/ stable/11/share/man/man5/pf.conf.5