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netfilter: nf_ct_helper: use nf_ct_iterate_destroy to unlink helper objs 

When we unlink the helper objects, we will iterate the nf_conntrack_hash,
iterate the unconfirmed list, handle the hash resize situation, etc.

Actually this logic is same as the nf_ct_iterate_destroy, so we can use
it to remove these copy & paste code.

Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2017-05-28 22:35:52 +08:00 committed by Pablo Neira Ayuso
parent 446a8268b7
commit ff1acc4964
1 changed files with 4 additions and 46 deletions
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50
net/netfilter/nf_conntrack_helper.c
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@ -285,16 +285,16 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper);
/* appropriate ct lock protecting must be taken by caller */
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
const struct nf_conntrack_helper *me)
static int unhelp(struct nf_conn *ct, void *me)
{
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i);
struct nf_conn_help *help = nfct_help(ct);
if (help && rcu_dereference_raw(help->helper) == me) {
nf_conntrack_event(IPCT_HELPER, ct);
RCU_INIT_POINTER(help->helper, NULL);
}
/* We are not intended to delete this conntrack. */
return 0;
}
@ -437,33 +437,10 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_register);
static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me,
struct net *net)
{
struct nf_conntrack_tuple_hash *h;
const struct hlist_nulls_node *nn;
int cpu;
/* Get rid of expecteds, set helpers to NULL. */
for_each_possible_cpu(cpu) {
struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
spin_lock_bh(&pcpu->lock);
hlist_nulls_for_each_entry(h, nn, &pcpu->unconfirmed, hnnode)
unhelp(h, me);
spin_unlock_bh(&pcpu->lock);
}
}
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_expect *exp;
const struct hlist_node *next;
const struct hlist_nulls_node *nn;
unsigned int last_hsize;
spinlock_t *lock;
struct net *net;
unsigned int i;
mutex_lock(&nf_ct_helper_mutex);
@ -491,26 +468,7 @@ void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
}
spin_unlock_bh(&nf_conntrack_expect_lock);
rtnl_lock();
for_each_net(net)
__nf_conntrack_helper_unregister(me, net);
rtnl_unlock();
local_bh_disable();
restart:
last_hsize = nf_conntrack_htable_size;
for (i = 0; i < last_hsize; i++) {
lock = &nf_conntrack_locks[i % CONNTRACK_LOCKS];
nf_conntrack_lock(lock);
if (last_hsize != nf_conntrack_htable_size) {
spin_unlock(lock);
goto restart;
}
hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode)
unhelp(h, me);
spin_unlock(lock);
}
local_bh_enable();
nf_ct_iterate_destroy(unhelp, me);
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);