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-rw-r--r--include/net/cls_cgroup.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h
index c15d39456..ccd6d8bff 100644
--- a/include/net/cls_cgroup.h
+++ b/include/net/cls_cgroup.h
@@ -49,9 +49,38 @@ static inline void sock_update_classid(struct sock *sk)
if (classid != sk->sk_classid)
sk->sk_classid = classid;
}
+
+static inline u32 task_get_classid(const struct sk_buff *skb)
+{
+ u32 classid = task_cls_state(current)->classid;
+
+ /* Due to the nature of the classifier it is required to ignore all
+ * packets originating from softirq context as accessing `current'
+ * would lead to false results.
+ *
+ * This test assumes that all callers of dev_queue_xmit() explicitly
+ * disable bh. Knowing this, it is possible to detect softirq based
+ * calls by looking at the number of nested bh disable calls because
+ * softirqs always disables bh.
+ */
+ if (in_serving_softirq()) {
+ /* If there is an sk_classid we'll use that. */
+ if (!skb->sk)
+ return 0;
+
+ classid = skb->sk->sk_classid;
+ }
+
+ return classid;
+}
#else /* !CONFIG_CGROUP_NET_CLASSID */
static inline void sock_update_classid(struct sock *sk)
{
}
+
+static inline u32 task_get_classid(const struct sk_buff *skb)
+{
+ return 0;
+}
#endif /* CONFIG_CGROUP_NET_CLASSID */
#endif /* _NET_CLS_CGROUP_H */