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| author | Patrick McHardy <kaber@trash.net> | 2007-02-12 11:14:11 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-02-12 11:14:11 -0800 |
| commit | 982d9a9ce389c396bc83ce29d799937f379ddcb7 (patch) | |
| tree | 5f470babe5eafa37aac006bc87a1fab31db80114 | |
| parent | 6b48a7d08d1bb2e3932bce1662fe411304acc18f (diff) | |
| download | linux-3.10-982d9a9ce389c396bc83ce29d799937f379ddcb7.tar.gz linux-3.10-982d9a9ce389c396bc83ce29d799937f379ddcb7.tar.bz2 linux-3.10-982d9a9ce389c396bc83ce29d799937f379ddcb7.zip | |
[NETFILTER]: nf_conntrack: properly use RCU for nf_conntrack_destroyed callback
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_core.c | 7 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 9 |
2 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c index 5156d5d6c3b..2c01378d359 100644 --- a/net/ipv4/netfilter/nf_nat_core.c +++ b/net/ipv4/netfilter/nf_nat_core.c @@ -617,8 +617,8 @@ static int __init nf_nat_init(void) } /* FIXME: Man, this is a hack. <SIGH> */ - NF_CT_ASSERT(nf_conntrack_destroyed == NULL); - nf_conntrack_destroyed = &nf_nat_cleanup_conntrack; + NF_CT_ASSERT(rcu_dereference(nf_conntrack_destroyed) == NULL); + rcu_assign_pointer(nf_conntrack_destroyed, nf_nat_cleanup_conntrack); /* Initialize fake conntrack so that NAT will skip it */ nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK; @@ -642,7 +642,8 @@ static int clean_nat(struct nf_conn *i, void *data) static void __exit nf_nat_cleanup(void) { nf_ct_iterate_cleanup(&clean_nat, NULL); - nf_conntrack_destroyed = NULL; + rcu_assign_pointer(nf_conntrack_destroyed, NULL); + synchronize_rcu(); vfree(bysource); nf_ct_l3proto_put(l3proto); } diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index d59640e2377..0cc150560fb 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -318,6 +318,7 @@ destroy_conntrack(struct nf_conntrack *nfct) struct nf_conn_help *help = nfct_help(ct); struct nf_conntrack_l3proto *l3proto; struct nf_conntrack_l4proto *l4proto; + typeof(nf_conntrack_destroyed) destroyed; DEBUGP("destroy_conntrack(%p)\n", ct); NF_CT_ASSERT(atomic_read(&nfct->use) == 0); @@ -341,10 +342,12 @@ destroy_conntrack(struct nf_conntrack *nfct) ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum); if (l4proto && l4proto->destroy) l4proto->destroy(ct); - rcu_read_unlock(); - if (nf_conntrack_destroyed) - nf_conntrack_destroyed(ct); + destroyed = rcu_dereference(nf_conntrack_destroyed); + if (destroyed) + destroyed(ct); + + rcu_read_unlock(); write_lock_bh(&nf_conntrack_lock); /* Expectations will have been removed in clean_from_lists, |