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authorJamal Hadi Salim <jhs@mojatatu.com>2016-09-19 19:02:51 -0400
committerDavid S. Miller <davem@davemloft.net>2016-09-20 23:34:55 -0400
commitaecc5cefc389735b5327d234e11d1fe505e1c280 (patch)
treeab8e60904b6455817d06a5a3acbe06b6f0028a63 /net/sched
parent1d9423ae0dbcdbfb914e9e516ed44379f0189555 (diff)
net sched actions: fix GETing actions
With the batch changes that translated transient actions into a temporary list lost in the translation was the fact that tcf_action_destroy() will eventually delete the action from the permanent location if the refcount is zero. Example of what broke: ...add a gact action to drop sudo $TC actions add action drop index 10 ...now retrieve it, looks good sudo $TC actions get action gact index 10 ...retrieve it again and find it is gone! sudo $TC actions get action gact index 10 Fixes: 22dc13c837c3 ("net_sched: convert tcf_exts from list to pointer array"), Fixes: 824a7e8863b3 ("net_sched: remove an unnecessary list_del()") Fixes: f07fed82ad79 ("net_sched: remove the leftover cleanup_a()") Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/act_api.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index d0aceb1740b1..c9102172ce3b 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -592,6 +592,17 @@ err_out:
return ERR_PTR(err);
}
+static void cleanup_a(struct list_head *actions, int ovr)
+{
+ struct tc_action *a;
+
+ if (!ovr)
+ return;
+
+ list_for_each_entry(a, actions, list)
+ a->tcfa_refcnt--;
+}
+
int tcf_action_init(struct net *net, struct nlattr *nla, struct nlattr *est,
char *name, int ovr, int bind, struct list_head *actions)
{
@@ -611,8 +622,15 @@ int tcf_action_init(struct net *net, struct nlattr *nla, struct nlattr *est,
goto err;
}
act->order = i;
+ if (ovr)
+ act->tcfa_refcnt++;
list_add_tail(&act->list, actions);
}
+
+ /* Remove the temp refcnt which was necessary to protect against
+ * destroying an existing action which was being replaced
+ */
+ cleanup_a(actions, ovr);
return 0;
err:
@@ -882,6 +900,8 @@ tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
goto err;
}
act->order = i;
+ if (event == RTM_GETACTION)
+ act->tcfa_refcnt++;
list_add_tail(&act->list, &actions);
}