[Bug 287146] accept_rtadv does not work on bridged interface

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287146

            Bug ID: 287146
           Summary: accept_rtadv does not work on bridged interface
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: d8zNeCFG@aon.at

Scenario:
- host and router running FreeBSD stable/14 ca. Feb. 1
- router getting an IPv4 address from the DSL provider and a (global) IPv6
address using 6to4 (on stf0)
- router announcing routes using rtadvd
- host has bridge0 configured with a single interface em0 (this is done so that
tap interfaces can be attached for bhyve)
- host also runs rtsold
- there are the following lines for bridge0 in /etc/rc.conf:

[0]# grep bridge /etc/rc.conf
    bridge0_mac="42:00:01:00:13:01"
# create a bridge for use by bhyve
cloned_interfaces="bridge0"
create_args_bridge0="ether $bridge0_mac addm em0 up"
ifconfig_bridge0="inet ${hostname} netmask 255.255.255.0"
ifconfig_bridge0_ipv6="inet6 accept_rtadv ${hostname} prefixlen 64"
[0]# 

- hostname is set to the host name, and there are both IPv4 (RFC1918) and IPv6
(site-local) addresses in /etc/hosts

Result:
- Even though accept_rtadv is set on bridge0 and the router properly reacts to
router solicitation requests, no global IPv6 address is set on bridge0.
- During boot (executing of the startup scripts), rtsold complains as follows
very early after the kernel startup messages:

rtsol: cap_llflags_get() failed, anyway I'll try
rtsol: sendmsg on bridge0: Can't assign requested address

Expected result:
- If bridge0 is omitted and em0 is used directly (with proper reconfiguration
in rc.conf), em0 gets a global IPv6 address. The same should hold for bridge0.
- Similarly, when em0 is used directly, there are now rtsol error messages
during startup. The same should hold when em0 is part of bridge0.

-- Martin

p.s. I also wrote
https://forums.freebsd.org/threads/mountd-does-not-respond-via-ipv6-over-a-bridge.97913/,
but when trying this bridge0 setup again today, it mostly worked - except for
the issue with rtsol.

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