[Bug 238580] [PATCH] respect defines from 'sys/netinet/ip_carp.h'

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238580

            Bug ID: 238580
           Summary: [PATCH] respect defines from 'sys/netinet/ip_carp.h'
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: egypcio at FreeBSD.org

Created attachment 205076
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205076&action=edit
D20638.diff

based on information from man pages like carp(4) and ifconfig(8), some
inconstant values popped out while I troubleshooted a HA setup using CARP.

  - advskew was able to be changed to values higher than CARP_MAXSKEW;
  - CARP advertisements collected via tcpdump were still using (respecting) its
limit;

changing values on net.inet.carp.demotion does not increase advskew above the
limit (expected, I think).

root at fw1-lab:~ # uname -UKvm
FreeBSD 13.0-CURRENT r348978 GENERIC  amd64 1300031 1300031

root at fw1-lab:~ # ifconfig vlan3131 vhid 10 advskew 254

root at fw1-lab:~ # echo $?
0

root at fw1-lab:~ # ifconfig vlan3131 | grep carp
        carp: MASTER vhid 10 advbase 1 advskew 254

root at fw1-lab:~ # tcpdump -c 1 -n -v -i vlan3131 carp -T carp
tcpdump: listening on vlan3131, link-type EN10MB (Ethernet), capture size
262144 bytes
15:56:59.299379 IP (tos 0xe0, ttl 255, id 0, offset 0, flags [DF], proto VRRP
(112), length 56)
    172.31.31.1 > 224.0.0.18: carp 172.31.31.1 > 224.0.0.18: CARPv2-advertise
36: vhid=10 advbase=1 advskew=240 authlen=7 counter=8688083474654986394
1 packet captured
1 packet received by filter
0 packets dropped by kernel

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