netfilter: nftables: update table flags from the commit phase

Do not update table flags from the preparation phase. Store the flags
update into the transaction, then update the flags from the commit
phase.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index fdec57d..67bc36f 100644 (file)
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1498,13 +1498,16 @@ struct nft_trans_chain {
 
 struct nft_trans_table {
        bool                            update;
-       bool                            enable;
+       u8                              state;
+       u32                             flags;
 };
 
 #define nft_trans_table_update(trans)  \
        (((struct nft_trans_table *)trans->data)->update)
-#define nft_trans_table_enable(trans)  \
-       (((struct nft_trans_table *)trans->data)->enable)
+#define nft_trans_table_state(trans)   \
+       (((struct nft_trans_table *)trans->data)->state)
+#define nft_trans_table_flags(trans)   \
+       (((struct nft_trans_table *)trans->data)->flags)
 
 struct nft_trans_elem {
        struct nft_set                  *set;

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 083c112..bd5e812 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -900,6 +900,12 @@ static void nf_tables_table_disable(struct net *net, struct nft_table *table)
        nft_table_disable(net, table, 0);
 }
 
+enum {
+       NFT_TABLE_STATE_UNCHANGED       = 0,
+       NFT_TABLE_STATE_DORMANT,
+       NFT_TABLE_STATE_WAKEUP
+};
+
 static int nf_tables_updtable(struct nft_ctx *ctx)
 {
        struct nft_trans *trans;
@@ -929,19 +935,17 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
 
        if ((flags & NFT_TABLE_F_DORMANT) &&
            !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
-               nft_trans_table_enable(trans) = false;
+               nft_trans_table_state(trans) = NFT_TABLE_STATE_DORMANT;
        } else if (!(flags & NFT_TABLE_F_DORMANT) &&
                   ctx->table->flags & NFT_TABLE_F_DORMANT) {
-               ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
                ret = nf_tables_table_enable(ctx->net, ctx->table);
                if (ret >= 0)
-                       nft_trans_table_enable(trans) = true;
-               else
-                       ctx->table->flags |= NFT_TABLE_F_DORMANT;
+                       nft_trans_table_state(trans) = NFT_TABLE_STATE_WAKEUP;
        }
        if (ret < 0)
                goto err;
 
+       nft_trans_table_flags(trans) = flags;
        nft_trans_table_update(trans) = true;
        list_add_tail(&trans->list, &ctx->net->nft.commit_list);
        return 0;
@@ -8068,11 +8072,10 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
                switch (trans->msg_type) {
                case NFT_MSG_NEWTABLE:
                        if (nft_trans_table_update(trans)) {
-                               if (!nft_trans_table_enable(trans)) {
-                                       nf_tables_table_disable(net,
-                                                               trans->ctx.table);
-                                       trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
-                               }
+                               if (nft_trans_table_state(trans) == NFT_TABLE_STATE_DORMANT)
+                                       nf_tables_table_disable(net, trans->ctx.table);
+
+                               trans->ctx.table->flags = nft_trans_table_flags(trans);
                        } else {
                                nft_clear(net, trans->ctx.table);
                        }
@@ -8283,11 +8286,9 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
                switch (trans->msg_type) {
                case NFT_MSG_NEWTABLE:
                        if (nft_trans_table_update(trans)) {
-                               if (nft_trans_table_enable(trans)) {
-                                       nf_tables_table_disable(net,
-                                                               trans->ctx.table);
-                                       trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
-                               }
+                               if (nft_trans_table_state(trans) == NFT_TABLE_STATE_WAKEUP)
+                                       nf_tables_table_disable(net, trans->ctx.table);
+
                                nft_trans_destroy(trans);
                        } else {
                                list_del_rcu(&trans->ctx.table->list);