[Bug 290011] ipfw ip6 error when using service name

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290011

--- Comment #3 from Andrey V. Elsukov <[email protected]> ---
(In reply to Bernard Spil from comment #2)

```
             A backslash (‘\’) can be used to escape the dash (‘-’) character
             in a service name (from a shell, the backslash must be typed
             twice to avoid the shell itself interpreting it as an escape
             character).

                   ipfw add count tcp from any ftp\\-data-ftp to any
```

# ipfw add 1 count ip from 3fff:1:2:3::1 dhcpv6\\-client to 3fff:1:2:3::/64
"dhcpv6\-client"
000001 count ip from 3fff:1:2:3::1 546 to 3fff:1:2:3::/64 546

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