This flag sets incoming switch device in order to let know that the flow
which the skb is part of is missed. Listener may react to it
appropriately,
Signed-off-by: Jiri Pirko <j...@resnulli.us>
---
include/linux/filter.h | 1 +
include/linux/skbuff.h | 13 +++++++++++++
net/core/filter.c | 3 +++
3 files changed, 17 insertions(+)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index e568c8e..38c7c04 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -154,6 +154,7 @@ enum {
BPF_S_ANC_VLAN_TAG,
BPF_S_ANC_VLAN_TAG_PRESENT,
BPF_S_ANC_PAY_OFFSET,
+ BPF_S_ANC_MISSED_FLOW,
};
#endif /* __LINUX_FILTER_H__ */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 03db95a..0100c2f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -567,6 +567,7 @@ struct sk_buff {
* headers if needed
*/
__u8 encapsulation:1;
+ __u8 missed_flow:1;
/* 6/8 bit hole (depending on ndisc_nodetype presence) */
kmemcheck_bitfield_end(flags2);
@@ -2993,5 +2994,17 @@ static inline unsigned int skb_gso_network_seglen(const
struct sk_buff *skb)
skb_network_header(skb);
return hdr_len + skb_gso_transport_seglen(skb);
}
+
+/**
+ * skb_mark_missed_flow - marks skb as a part of missed flow
+ * @skb: buffer
+ *
+ * Marks skb as a part of missed flow.
+ */
+static inline void skb_mark_missed_flow(struct sk_buff *skb)
+{
+ skb->missed_flow = 1;
+}
+
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */
diff --git a/net/core/filter.c b/net/core/filter.c
index ad30d62..048f11a 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -350,6 +350,9 @@ load_b:
case BPF_S_ANC_PAY_OFFSET:
A = __skb_get_poff(skb);
continue;
+ case BPF_S_ANC_MISSED_FLOW:
+ A = !!skb->missed_flow;
+ continue;
case BPF_S_ANC_NLATTR: {
struct nlattr *nla;
--
1.8.5.3
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