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pfsync: fix pfsync_undefer_state() locking

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pfsync_undefer_state() takes the bucket lock, but could get called from
places (e.g. from pfsync_update_state() or pfsync_delete_state()) where
we already held the lock.

As it can also be called from places where we don't yet hold the lock
create new locked variant for use when the lock is already held. Keep
using pfsync_undefer_state() where the lock must still be taken.

PR:		268246
MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC (Netgate)
This commit is contained in:
Kristof Provost 2023-03-20 14:29:55 +01:00
parent 844ad2828a
commit 53247cdf12
1 changed files with 16 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
sys/netpfil/pf/if_pfsync.c
View File

@ -297,6 +297,7 @@ static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
static int pfsync_defer(struct pf_kstate *, struct mbuf *);
static void pfsync_undefer(struct pfsync_deferral *, int);
static void pfsync_undefer_state_locked(struct pf_kstate *, int);
static void pfsync_undefer_state(struct pf_kstate *, int);
static void pfsync_defer_tmo(void *);
@ -1851,28 +1852,37 @@ pfsync_defer_tmo(void *arg)
}
static void
pfsync_undefer_state(struct pf_kstate *st, int drop)
pfsync_undefer_state_locked(struct pf_kstate *st, int drop)
{
struct pfsync_softc *sc = V_pfsyncif;
struct pfsync_deferral *pd;
struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
PFSYNC_BUCKET_LOCK(b);
PFSYNC_BUCKET_LOCK_ASSERT(b);
TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) {
if (pd->pd_st == st) {
if (callout_stop(&pd->pd_tmo) > 0)
pfsync_undefer(pd, drop);
PFSYNC_BUCKET_UNLOCK(b);
return;
}
}
PFSYNC_BUCKET_UNLOCK(b);
panic("%s: unable to find deferred state", __func__);
}
static void
pfsync_undefer_state(struct pf_kstate *st, int drop)
{
struct pfsync_softc *sc = V_pfsyncif;
struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
PFSYNC_BUCKET_LOCK(b);
pfsync_undefer_state_locked(st, drop);
PFSYNC_BUCKET_UNLOCK(b);
}
static struct pfsync_bucket*
pfsync_get_bucket(struct pfsync_softc *sc, struct pf_kstate *st)
{
@ -1891,7 +1901,7 @@ pfsync_update_state(struct pf_kstate *st)
PFSYNC_BUCKET_LOCK(b);
if (st->state_flags & PFSTATE_ACK)
pfsync_undefer_state(st, 0);
pfsync_undefer_state_locked(st, 0);
if (st->state_flags & PFSTATE_NOSYNC) {
if (st->sync_state != PFSYNC_S_NONE)
pfsync_q_del(st, true, b);
@ -2034,7 +2044,7 @@ pfsync_delete_state(struct pf_kstate *st)
PFSYNC_BUCKET_LOCK(b);
if (st->state_flags & PFSTATE_ACK)
pfsync_undefer_state(st, 1);
pfsync_undefer_state_locked(st, 1);
if (st->state_flags & PFSTATE_NOSYNC) {
if (st->sync_state != PFSYNC_S_NONE)
pfsync_q_del(st, true, b);