diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_core.c')
-rw-r--r-- | net/netfilter/nf_conntrack_core.c | 89 |
1 files changed, 78 insertions, 11 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 14235b1..5f72b94 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -183,10 +183,6 @@ destroy_conntrack(struct nf_conntrack *nfct) NF_CT_ASSERT(atomic_read(&nfct->use) == 0); NF_CT_ASSERT(!timer_pending(&ct->timeout)); - if (!test_bit(IPS_DYING_BIT, &ct->status)) - nf_conntrack_event(IPCT_DESTROY, ct); - set_bit(IPS_DYING_BIT, &ct->status); - /* To make sure we don't get any weird locking issues here: * destroy_conntrack() MUST NOT be called with a write lock * to nf_conntrack_lock!!! -HW */ @@ -220,9 +216,8 @@ destroy_conntrack(struct nf_conntrack *nfct) nf_conntrack_free(ct); } -static void death_by_timeout(unsigned long ul_conntrack) +void nf_ct_delete_from_lists(struct nf_conn *ct) { - struct nf_conn *ct = (void *)ul_conntrack; struct net *net = nf_ct_net(ct); nf_ct_helper_destroy(ct); @@ -232,6 +227,59 @@ static void death_by_timeout(unsigned long ul_conntrack) NF_CT_STAT_INC(net, delete_list); clean_from_lists(ct); spin_unlock_bh(&nf_conntrack_lock); +} +EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); + +static void death_by_event(unsigned long ul_conntrack) +{ + struct nf_conn *ct = (void *)ul_conntrack; + struct net *net = nf_ct_net(ct); + + if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { + /* bad luck, let's retry again */ + ct->timeout.expires = jiffies + + (random32() % net->ct.sysctl_events_retry_timeout); + add_timer(&ct->timeout); + return; + } + /* we've got the event delivered, now it's dying */ + set_bit(IPS_DYING_BIT, &ct->status); + spin_lock(&nf_conntrack_lock); + hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); + spin_unlock(&nf_conntrack_lock); + nf_ct_put(ct); +} + +void nf_ct_insert_dying_list(struct nf_conn *ct) +{ + struct net *net = nf_ct_net(ct); + + /* add this conntrack to the dying list */ + spin_lock_bh(&nf_conntrack_lock); + hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, + &net->ct.dying); + spin_unlock_bh(&nf_conntrack_lock); + /* set a new timer to retry event delivery */ + setup_timer(&ct->timeout, death_by_event, (unsigned long)ct); + ct->timeout.expires = jiffies + + (random32() % net->ct.sysctl_events_retry_timeout); + add_timer(&ct->timeout); +} +EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list); + +static void death_by_timeout(unsigned long ul_conntrack) +{ + struct nf_conn *ct = (void *)ul_conntrack; + + if (!test_bit(IPS_DYING_BIT, &ct->status) && + unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { + /* destroy event was not delivered */ + nf_ct_delete_from_lists(ct); + nf_ct_insert_dying_list(ct); + return; + } + set_bit(IPS_DYING_BIT, &ct->status); + nf_ct_delete_from_lists(ct); nf_ct_put(ct); } @@ -982,11 +1030,13 @@ static int kill_report(struct nf_conn *i, void *data) { struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; - /* get_next_corpse sets the dying bit for us */ - nf_conntrack_event_report(IPCT_DESTROY, - i, - fr->pid, - fr->report); + /* If we fail to deliver the event, death_by_timeout() will retry */ + if (nf_conntrack_event_report(IPCT_DESTROY, i, + fr->pid, fr->report) < 0) + return 1; + + /* Avoid the delivery of the destroy event in death_by_timeout(). */ + set_bit(IPS_DYING_BIT, &i->status); return 1; } @@ -1015,6 +1065,21 @@ void nf_conntrack_flush_report(struct net *net, u32 pid, int report) } EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); +static void nf_ct_release_dying_list(void) +{ + struct nf_conntrack_tuple_hash *h; + struct nf_conn *ct; + struct hlist_nulls_node *n; + + spin_lock_bh(&nf_conntrack_lock); + hlist_nulls_for_each_entry(h, n, &init_net.ct.dying, hnnode) { + ct = nf_ct_tuplehash_to_ctrack(h); + /* never fails to remove them, no listeners at this point */ + nf_ct_kill(ct); + } + spin_unlock_bh(&nf_conntrack_lock); +} + static void nf_conntrack_cleanup_init_net(void) { nf_conntrack_helper_fini(); @@ -1026,6 +1091,7 @@ static void nf_conntrack_cleanup_net(struct net *net) { i_see_dead_people: nf_ct_iterate_cleanup(net, kill_all, NULL); + nf_ct_release_dying_list(); if (atomic_read(&net->ct.count) != 0) { schedule(); goto i_see_dead_people; @@ -1207,6 +1273,7 @@ static int nf_conntrack_init_net(struct net *net) atomic_set(&net->ct.count, 0); INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0); + INIT_HLIST_NULLS_HEAD(&net->ct.dying, 0); net->ct.stat = alloc_percpu(struct ip_conntrack_stat); if (!net->ct.stat) { ret = -ENOMEM; |