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pfsync: Handle syncdev going away

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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
This commit is contained in:
Kristof Provost 2018-11-02 16:57:23 +00:00
parent 26549dfcad
commit fbbf436d56
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=340068
4 changed files with 34 additions and 0 deletions
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2
sys/net/pfvar.h
View File

@ -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 *);

27
sys/netpfil/pf/if_pfsync.c
View File

@ -281,6 +281,7 @@ static void pfsync_bulk_status(u_int8_t);
static void pfsync_bulk_update(void *);
static void pfsync_bulk_fail(void *);
static void pfsync_detach_ifnet(struct ifnet *);
#ifdef IPSEC
static void pfsync_update_net_tdb(struct pfsync_tdb *);
#endif
@ -2292,6 +2293,29 @@ pfsync_multicast_cleanup(struct pfsync_softc *sc)
imo->imo_multicast_ifp = NULL;
}
void
pfsync_detach_ifnet(struct ifnet *ifp)
{
struct pfsync_softc *sc = V_pfsyncif;
if (sc == NULL)
return;
PFSYNC_LOCK(sc);
if (sc->sc_sync_if == ifp) {
/* We don't need mutlicast cleanup here, because the interface
* is going away. We do need to ensure we don't try to do
* cleanup later.
*/
sc->sc_imo.imo_membership = NULL;
sc->sc_imo.imo_multicast_ifp = NULL;
sc->sc_sync_if = NULL;
}
PFSYNC_UNLOCK(sc);
}
#ifdef INET
extern struct domain inetdomain;
static struct protosw in_pfsync_protosw = {
@ -2372,6 +2396,8 @@ pfsync_init()
#ifdef INET
int error;
pfsync_detach_ifnet_ptr = pfsync_detach_ifnet;
error = pf_proto_register(PF_INET, &in_pfsync_protosw);
if (error)
return (error);
@ -2388,6 +2414,7 @@ pfsync_init()
static void
pfsync_uninit()
{
pfsync_detach_ifnet_ptr = NULL;
#ifdef INET
ipproto_unregister(IPPROTO_PFSYNC);

4
sys/netpfil/pf/pf_if.c
View File

@ -834,6 +834,9 @@ pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
{
struct pfi_kif *kif = (struct pfi_kif *)ifp->if_pf_kif;
if (pfsync_detach_ifnet_ptr)
pfsync_detach_ifnet_ptr(ifp);
if (kif == NULL)
return;
@ -841,6 +844,7 @@ pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
/* Avoid teardown race in the least expensive way. */
return;
}
PF_RULES_WLOCK();
V_pfi_update++;
pfi_kif_update(kif);

1
sys/netpfil/pf/pf_ioctl.c
View File

@ -218,6 +218,7 @@ VNET_DEFINE(pfsync_update_state_t *, pfsync_update_state_ptr);
VNET_DEFINE(pfsync_delete_state_t *, pfsync_delete_state_ptr);
VNET_DEFINE(pfsync_clear_states_t *, pfsync_clear_states_ptr);
VNET_DEFINE(pfsync_defer_t *, pfsync_defer_ptr);
pfsync_detach_ifnet_t *pfsync_detach_ifnet_ptr;
/* pflog */
pflog_packet_t *pflog_packet_ptr = NULL;