The branch main has been updated by donner:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=f6f297871d469daf808f78faead8f950a2c81e36

commit f6f297871d469daf808f78faead8f950a2c81e36
Author:     Lutz Donnerhacke <don...@freebsd.org>
AuthorDate: 2021-05-11 08:22:16 +0000
Commit:     Lutz Donnerhacke <don...@freebsd.org>
CommitDate: 2021-05-11 08:44:33 +0000

    sbin/ipfw: Allow tablearg as hostname
    
    Hostnames starting with "tablearg" are considered as a functional
    argument instead of a literal.
    
    Reported by:    ae
    Reviewers:      ae
    MFC after:      1 week
    Differential Revision: https://reviews.freebsd.org/D30208
---
 sbin/ipfw/ipfw2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index 498da22e6599..fb1d9a4a180b 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -4021,7 +4021,8 @@ chkarg:
 
                NEED1("missing forward address[:port]");
 
-               if (strncmp(*av, "tablearg", 8) == 0)
+               if (strncmp(*av, "tablearg", 8) == 0 &&
+                   ((*av)[8] == '\0' || (*av)[8] == ',' || (*av)[8] == ':'))
                        memcpy(++(*av), "0.0.0.0", 7);
 
                /*
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