[PATCH 18/51] netfilter: nf_flow_table: track flow tables in nf_flow_table directly

[Pablo Neira Ayuso]

From: Felix Fietkau <n...@nbd.name>

Avoids having nf_flow_table depend on nftables (useful for future
iptables backport work)

Signed-off-by: Felix Fietkau <n...@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 include/net/netfilter/nf_flow_table.h |  1 +
 include/net/netfilter/nf_tables.h     |  3 ---
 net/netfilter/nf_flow_table_core.c    | 21 ++++++++++++++++++---
 net/netfilter/nf_tables_api.c         | 17 -----------------
 4 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/include/net/netfilter/nf_flow_table.h 
b/include/net/netfilter/nf_flow_table.h
index f876e32a60b8..ab408adba688 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -21,6 +21,7 @@ struct nf_flowtable_type {
 };
 
 struct nf_flowtable {
+       struct list_head                list;
        struct rhashtable               rhashtable;
        const struct nf_flowtable_type  *type;
        struct delayed_work             gc_work;
diff --git a/include/net/netfilter/nf_tables.h 
b/include/net/netfilter/nf_tables.h
index cd368d1b8cb8..2f2062ae1c45 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1109,9 +1109,6 @@ struct nft_flowtable {
 struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table,
                                                 const struct nlattr *nla,
                                                 u8 genmask);
-void nft_flow_table_iterate(struct net *net,
-                           void (*iter)(struct nf_flowtable *flowtable, void 
*data),
-                           void *data);
 
 void nft_register_flowtable_type(struct nf_flowtable_type *type);
 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
diff --git a/net/netfilter/nf_flow_table_core.c 
b/net/netfilter/nf_flow_table_core.c
index 09d1be669c39..e761359b56a9 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -18,6 +18,9 @@ struct flow_offload_entry {
        struct rcu_head         rcu_head;
 };
 
+static DEFINE_MUTEX(flowtable_lock);
+static LIST_HEAD(flowtables);
+
 static void
 flow_offload_fill_dir(struct flow_offload *flow, struct nf_conn *ct,
                      struct nf_flow_route *route,
@@ -410,6 +413,10 @@ int nf_flow_table_init(struct nf_flowtable *flowtable)
        queue_delayed_work(system_power_efficient_wq,
                           &flowtable->gc_work, HZ);
 
+       mutex_lock(&flowtable_lock);
+       list_add(&flowtable->list, &flowtables);
+       mutex_unlock(&flowtable_lock);
+
        return 0;
 }
 EXPORT_SYMBOL_GPL(nf_flow_table_init);
@@ -425,20 +432,28 @@ static void nf_flow_table_do_cleanup(struct flow_offload 
*flow, void *data)
 }
 
 static void nf_flow_table_iterate_cleanup(struct nf_flowtable *flowtable,
-                                         void *data)
+                                         struct net_device *dev)
 {
-       nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, data);
+       nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);
        flush_delayed_work(&flowtable->gc_work);
 }
 
 void nf_flow_table_cleanup(struct net *net, struct net_device *dev)
 {
-       nft_flow_table_iterate(net, nf_flow_table_iterate_cleanup, dev);
+       struct nf_flowtable *flowtable;
+
+       mutex_lock(&flowtable_lock);
+       list_for_each_entry(flowtable, &flowtables, list)
+               nf_flow_table_iterate_cleanup(flowtable, dev);
+       mutex_unlock(&flowtable_lock);
 }
 EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
 
 void nf_flow_table_free(struct nf_flowtable *flow_table)
 {
+       mutex_lock(&flowtable_lock);
+       list_del(&flow_table->list);
+       mutex_unlock(&flowtable_lock);
        cancel_delayed_work_sync(&flow_table->gc_work);
        nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
        WARN_ON(!nf_flow_offload_gc_step(flow_table));
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 517bb93c00fb..16b67f54b3d2 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5060,23 +5060,6 @@ static const struct nf_flowtable_type 
*nft_flowtable_type_get(u8 family)
        return ERR_PTR(-ENOENT);
 }
 
-void nft_flow_table_iterate(struct net *net,
-                           void (*iter)(struct nf_flowtable *flowtable, void 
*data),
-                           void *data)
-{
-       struct nft_flowtable *flowtable;
-       const struct nft_table *table;
-
-       nfnl_lock(NFNL_SUBSYS_NFTABLES);
-       list_for_each_entry(table, &net->nft.tables, list) {
-               list_for_each_entry(flowtable, &table->flowtables, list) {
-                       iter(&flowtable->data, data);
-               }
-       }
-       nfnl_unlock(NFNL_SUBSYS_NFTABLES);
-}
-EXPORT_SYMBOL_GPL(nft_flow_table_iterate);
-
 static void nft_unregister_flowtable_net_hooks(struct net *net,
                                               struct nft_flowtable *flowtable)
 {
-- 
2.11.0