netfilter: netns nat: per-netns bysource hash

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 45 insertions, 27 deletions

diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index 5d4a5b70da2b..2ac9eaf1a8c9 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -37,9 +37,6 @@ static struct nf_conntrack_l3proto *l3proto __read_mostly;
 
 /* Calculated at init based on memory size */
 static unsigned int nf_nat_htable_size __read_mostly;
-static int nf_nat_vmalloced;
-
-static struct hlist_head *bysource __read_mostly;
 
 #define MAX_IP_NAT_PROTO 256
 static const struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO]
@@ -145,7 +142,8 @@ same_src(const struct nf_conn *ct,
 
 /* Only called for SRC manip */
 static int
-find_appropriate_src(const struct nf_conntrack_tuple *tuple,
+find_appropriate_src(struct net *net,
+                     const struct nf_conntrack_tuple *tuple,
                      struct nf_conntrack_tuple *result,
                      const struct nf_nat_range *range)
 {
@@ -155,7 +153,7 @@ find_appropriate_src(const struct nf_conntrack_tuple *tuple,
         const struct hlist_node *n;
 
         rcu_read_lock();
-        hlist_for_each_entry_rcu(nat, n, &bysource[h], bysource) {
+        hlist_for_each_entry_rcu(nat, n, &net->ipv4.nat_bysource[h], bysource) {
                 ct = nat->ct;
                 if (same_src(ct, tuple)) {
                         /* Copy source part from reply tuple. */
@@ -231,6 +229,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
                  struct nf_conn *ct,
                  enum nf_nat_manip_type maniptype)
 {
+        struct net *net = nf_ct_net(ct);
         const struct nf_nat_protocol *proto;
 
         /* 1) If this srcip/proto/src-proto-part is currently mapped,
@@ -242,7 +241,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
            manips not an issue.  */
         if (maniptype == IP_NAT_MANIP_SRC &&
             !(range->flags & IP_NAT_RANGE_PROTO_RANDOM)) {
-                if (find_appropriate_src(orig_tuple, tuple, range)) {
+                if (find_appropriate_src(net, orig_tuple, tuple, range)) {
                         pr_debug("get_unique_tuple: Found current src map\n");
                         if (!nf_nat_used_tuple(tuple, ct))
                                 return;
@@ -283,6 +282,7 @@ nf_nat_setup_info(struct nf_conn *ct,
                   const struct nf_nat_range *range,
                   enum nf_nat_manip_type maniptype)
 {
+        struct net *net = nf_ct_net(ct);
         struct nf_conntrack_tuple curr_tuple, new_tuple;
         struct nf_conn_nat *nat;
         int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
@@ -334,7 +334,8 @@ nf_nat_setup_info(struct nf_conn *ct,
                 /* nf_conntrack_alter_reply might re-allocate exntension aera */
                 nat = nfct_nat(ct);
                 nat->ct = ct;
-                hlist_add_head_rcu(&nat->bysource, &bysource[srchash]);
+                hlist_add_head_rcu(&nat->bysource,
+                                   &net->ipv4.nat_bysource[srchash]);
                 spin_unlock_bh(&nf_nat_lock);
         }
 
@@ -583,6 +584,40 @@ static struct nf_ct_ext_type nat_extend __read_mostly = {
         .flags          = NF_CT_EXT_F_PREALLOC,
 };
 
+static int __net_init nf_nat_net_init(struct net *net)
+{
+        net->ipv4.nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
+                                                      &net->ipv4.nat_vmalloced);
+        if (!net->ipv4.nat_bysource)
+                return -ENOMEM;
+        return 0;
+}
+
+/* Clear NAT section of all conntracks, in case we're loaded again. */
+static int clean_nat(struct nf_conn *i, void *data)
+{
+        struct nf_conn_nat *nat = nfct_nat(i);
+
+        if (!nat)
+                return 0;
+        memset(nat, 0, sizeof(*nat));
+        i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
+        return 0;
+}
+
+static void __net_exit nf_nat_net_exit(struct net *net)
+{
+        nf_ct_iterate_cleanup(net, &clean_nat, NULL);
+        synchronize_rcu();
+        nf_ct_free_hashtable(net->ipv4.nat_bysource, net->ipv4.nat_vmalloced,
+                             nf_nat_htable_size);
+}
+
+static struct pernet_operations nf_nat_net_ops = {
+        .init = nf_nat_net_init,
+        .exit = nf_nat_net_exit,
+};
+
 static int __init nf_nat_init(void)
 {
         size_t i;
@@ -599,12 +634,9 @@ static int __init nf_nat_init(void)
         /* Leave them the same for the moment. */
         nf_nat_htable_size = nf_conntrack_htable_size;
 
-        bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
-                                         &nf_nat_vmalloced);
-        if (!bysource) {
-                ret = -ENOMEM;
+        ret = register_pernet_subsys(&nf_nat_net_ops);
+        if (ret < 0)
                 goto cleanup_extend;
-        }
 
         /* Sew in builtin protocols. */
         spin_lock_bh(&nf_nat_lock);
@@ -629,23 +661,9 @@ static int __init nf_nat_init(void)
         return ret;
 }
 
-/* Clear NAT section of all conntracks, in case we're loaded again. */
-static int clean_nat(struct nf_conn *i, void *data)
-{
-        struct nf_conn_nat *nat = nfct_nat(i);
-
-        if (!nat)
-                return 0;
-        memset(nat, 0, sizeof(*nat));
-        i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
-        return 0;
-}
-
 static void __exit nf_nat_cleanup(void)
 {
-        nf_ct_iterate_cleanup(&init_net, &clean_nat, NULL);
-        synchronize_rcu();
-        nf_ct_free_hashtable(bysource, nf_nat_vmalloced, nf_nat_htable_size);
+        unregister_pernet_subsys(&nf_nat_net_ops);
         nf_ct_l3proto_put(l3proto);
         nf_ct_extend_unregister(&nat_extend);
         rcu_assign_pointer(nf_nat_seq_adjust_hook, NULL);