From: Pablo Neira Ayuso pablo@netfilter.org
From: Laura Garcia Liebana nevola@gmail.com
commit 9b05b6e11d5e93a3a517cadc12b9836e0470c255 upstream.
The deletion of a flowtable after a flush in the same transaction results in EBUSY. This patch adds an activation and deactivation of flowtables in order to update the _use_ counter.
Signed-off-by: Laura Garcia Liebana nevola@gmail.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/netfilter/nf_tables.h | 4 ++++ net/netfilter/nf_tables_api.c | 16 ++++++++++++++++ net/netfilter/nft_flow_offload.c | 19 +++++++++++++++++++ 3 files changed, 39 insertions(+)
--- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -1161,6 +1161,10 @@ struct nft_flowtable *nft_flowtable_look const struct nlattr *nla, u8 genmask);
+void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, + struct nft_flowtable *flowtable, + enum nft_trans_phase phase); + void nft_register_flowtable_type(struct nf_flowtable_type *type); void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
--- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5519,6 +5519,22 @@ struct nft_flowtable *nft_flowtable_look } EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
+void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, + struct nft_flowtable *flowtable, + enum nft_trans_phase phase) +{ + switch (phase) { + case NFT_TRANS_PREPARE: + case NFT_TRANS_ABORT: + case NFT_TRANS_RELEASE: + flowtable->use--; + /* fall through */ + default: + return; + } +} +EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable); + static struct nft_flowtable * nft_flowtable_lookup_byhandle(const struct nft_table *table, const struct nlattr *nla, u8 genmask) --- a/net/netfilter/nft_flow_offload.c +++ b/net/netfilter/nft_flow_offload.c @@ -175,6 +175,23 @@ static int nft_flow_offload_init(const s return nf_ct_netns_get(ctx->net, ctx->family); }
+static void nft_flow_offload_deactivate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + enum nft_trans_phase phase) +{ + struct nft_flow_offload *priv = nft_expr_priv(expr); + + nf_tables_deactivate_flowtable(ctx, priv->flowtable, phase); +} + +static void nft_flow_offload_activate(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_flow_offload *priv = nft_expr_priv(expr); + + priv->flowtable->use++; +} + static void nft_flow_offload_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) { @@ -203,6 +220,8 @@ static const struct nft_expr_ops nft_flo .size = NFT_EXPR_SIZE(sizeof(struct nft_flow_offload)), .eval = nft_flow_offload_eval, .init = nft_flow_offload_init, + .activate = nft_flow_offload_activate, + .deactivate = nft_flow_offload_deactivate, .destroy = nft_flow_offload_destroy, .validate = nft_flow_offload_validate, .dump = nft_flow_offload_dump,