pfsync: Handle syncdev going away

If the syncdev is removed we no longer need to clean up the multicast
entry we've got set up for that device.

Pass the ifnet detach event through pf to pfsync, and remove our
multicast handle, and mark us as no longer having a syncdev.

Note that this callback is always installed, even if the pfsync
interface is disabled (and thus it's not a per-vnet callback pointer).

MFC after:	2 weeks
Sponsored by:	Orange Business Services
Differential Revision:	https://reviews.freebsd.org/D17502

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/net/pfvar.h b/sys/net/pfvar.h
index 9ace26e49d0c..2924c06dbc43 100644
--- a/sys/net/pfvar.h
+++ b/sys/net/pfvar.h
@@ -824,6 +824,7 @@ typedef	void		pfsync_update_state_t(struct pf_state *);
 typedef	void		pfsync_delete_state_t(struct pf_state *);
 typedef void		pfsync_clear_states_t(u_int32_t, const char *);
 typedef int		pfsync_defer_t(struct pf_state *, struct mbuf *);
+typedef void		pfsync_detach_ifnet_t(struct ifnet *);
 
 VNET_DECLARE(pfsync_state_import_t *, pfsync_state_import_ptr);
 #define V_pfsync_state_import_ptr	VNET(pfsync_state_import_ptr)
@@ -837,6 +838,7 @@ VNET_DECLARE(pfsync_clear_states_t *, pfsync_clear_states_ptr);
 #define V_pfsync_clear_states_ptr	VNET(pfsync_clear_states_ptr)
 VNET_DECLARE(pfsync_defer_t *, pfsync_defer_ptr);
 #define V_pfsync_defer_ptr		VNET(pfsync_defer_ptr)
+extern pfsync_detach_ifnet_t	*pfsync_detach_ifnet_ptr;
 
 void			pfsync_state_export(struct pfsync_state *,
 			    struct pf_state *);