[Bug 213804] [carp]: packets got processes on the BACKUP node under certain conditions

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213804

            Bug ID: 213804
           Summary: [carp]: packets got processes on the BACKUP node under
                    certain conditions
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emz at norma.perm.ru

Consider the following scheme:


          +-----------------+
   iface1 |                 | iface2
  +-------| host A (MASTER) |--------
  |       |                 |
  |       +-----------------+
carp1
  |       +-----------------+
  |       |                 |  iface2
  +-------| host B (BACKUP) |--------  << packet to carp 1 IP
   iface1 |                 |
          +-----------------+

Lets assume both hosts are advertising themselves using rtadvd as ipv6 routers
for network attached to the iface2. In this case, they both can receive ipv6
packets undercertain conditions, destined to the CARP address carp1. When a
BACKUP node receives such packets, it processes them locally, regardless of the
state of the CARP, as if it was MASTER.

I observe this only on the ipv6, because the process of router advertising in
ipv6 is different from ipv4. However, I suppose the same rule applies to the
ipv4, but it's not that important, since I cannot imagine the configuration
that would reproduce this for ipv4.

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