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-rw-r--r--net/sched/act_api.c4
-rw-r--r--net/sched/cls_api.c70
2 files changed, 60 insertions, 14 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 148a89ab789b..b43df1e25c6d 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -36,7 +36,7 @@ static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
if (!tp)
return -EINVAL;
- a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
+ a->goto_chain = tcf_chain_get_by_act(tp->chain->block, chain_index);
if (!a->goto_chain)
return -ENOMEM;
return 0;
@@ -44,7 +44,7 @@ static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
static void tcf_action_goto_chain_fini(struct tc_action *a)
{
- tcf_chain_put(a->goto_chain);
+ tcf_chain_put_by_act(a->goto_chain);
}
static void tcf_action_goto_chain_exec(const struct tc_action *a,
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 75cce2819de9..e20aad1987b8 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -262,6 +262,25 @@ static void tcf_chain_hold(struct tcf_chain *chain)
++chain->refcnt;
}
+static void tcf_chain_hold_by_act(struct tcf_chain *chain)
+{
+ ++chain->action_refcnt;
+}
+
+static void tcf_chain_release_by_act(struct tcf_chain *chain)
+{
+ --chain->action_refcnt;
+}
+
+static bool tcf_chain_is_zombie(struct tcf_chain *chain)
+{
+ /* In case all the references are action references, this
+ * chain is a zombie and should not be listed in the chain
+ * dump list.
+ */
+ return chain->refcnt == chain->action_refcnt;
+}
+
static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
u32 chain_index)
{
@@ -298,6 +317,15 @@ struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
}
EXPORT_SYMBOL(tcf_chain_get);
+struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
+{
+ struct tcf_chain *chain = tcf_chain_get(block, chain_index, true);
+
+ tcf_chain_hold_by_act(chain);
+ return chain;
+}
+EXPORT_SYMBOL(tcf_chain_get_by_act);
+
static void tc_chain_tmplt_del(struct tcf_chain *chain);
void tcf_chain_put(struct tcf_chain *chain)
@@ -310,6 +338,13 @@ void tcf_chain_put(struct tcf_chain *chain)
}
EXPORT_SYMBOL(tcf_chain_put);
+void tcf_chain_put_by_act(struct tcf_chain *chain)
+{
+ tcf_chain_release_by_act(chain);
+ tcf_chain_put(chain);
+}
+EXPORT_SYMBOL(tcf_chain_put_by_act);
+
static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
{
if (chain->explicitly_created)
@@ -1803,20 +1838,29 @@ replay:
chain = tcf_chain_lookup(block, chain_index);
if (n->nlmsg_type == RTM_NEWCHAIN) {
if (chain) {
- NL_SET_ERR_MSG(extack, "Filter chain already exists");
- return -EEXIST;
- }
- if (!(n->nlmsg_flags & NLM_F_CREATE)) {
- NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
- return -ENOENT;
- }
- chain = tcf_chain_create(block, chain_index);
- if (!chain) {
- NL_SET_ERR_MSG(extack, "Failed to create filter chain");
- return -ENOMEM;
+ if (tcf_chain_is_zombie(chain)) {
+ /* The chain exists only because there is
+ * some action referencing it, meaning it
+ * is a zombie.
+ */
+ tcf_chain_hold(chain);
+ } else {
+ NL_SET_ERR_MSG(extack, "Filter chain already exists");
+ return -EEXIST;
+ }
+ } else {
+ if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+ NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
+ return -ENOENT;
+ }
+ chain = tcf_chain_create(block, chain_index);
+ if (!chain) {
+ NL_SET_ERR_MSG(extack, "Failed to create filter chain");
+ return -ENOMEM;
+ }
}
} else {
- if (!chain) {
+ if (!chain || tcf_chain_is_zombie(chain)) {
NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
return -EINVAL;
}
@@ -1944,6 +1988,8 @@ static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
index++;
continue;
}
+ if (tcf_chain_is_zombie(chain))
+ continue;
err = tc_chain_fill_node(chain, net, skb, block,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,