5.4-stable review patch. If anyone has any objections, please let me know.
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From: Pablo Neira Ayuso pablo@netfilter.org
commit 0ce7cf4127f14078ca598ba9700d813178a59409 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/netfilter/nf_tables.h | 9 ++++++--- net/netfilter/nf_tables_api.c | 31 ++++++++++++++++--------------- 2 files changed, 22 insertions(+), 18 deletions(-)
--- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -1392,13 +1392,16 @@ 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; --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -893,6 +893,12 @@ static void nf_tables_table_disable(stru 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; @@ -916,19 +922,17 @@ static int nf_tables_updtable(struct nft
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; nft_trans_commit_list_add_tail(ctx->net, trans); return 0; @@ -7298,11 +7302,10 @@ static int nf_tables_commit(struct net * 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); } @@ -7497,11 +7500,9 @@ static int __nf_tables_abort(struct net 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);