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if: guard against if_ioctl being NULL
There are situations where an struct ifnet has a NULL if_ioctl pointer.
For example, e6000sw creates such struct ifnets for each of its ports s=
o it
can
call into the MII code.
If there is then a link state event this calls do_link_state_change()
-> rtnl_handle_ifevent() -> dump_iface() -> get_operstate() ->
get_operstate_ether(). That wants to know if the link is up or down, so=
it
tries
to ioctl(SIOCGIFMEDIA), which doesn't go well if if_ioctl is NULL.
Guard against this, and return EOPNOTSUPP.
PR: 275920
MFC ater: 3 days
Approved by: re (cperciva)
Sponsored by: Rubicon Communications, LLC ("Netgate")
(cherry picked from commit 43387b4e574043b78a58c8bcb7575161b055fce1)
(cherry picked from commit 9a8a26aefb366ef6f497d48547a1562a1de566c1)
sys/net/if.c | 3 +++
1 file changed, 3 insertions(+)
--=20
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