Add an input flag to flow dissector on rather dissection should be
stopped when an L3 packet is encountered. This would be useful if a
caller just wanted to get IP addresses of the outermost header (e.g.
to do an L3 hash).
Signed-off-by: Tom Herbert <t...@herbertland.com>
---
include/net/flow_dissector.h | 1 +
net/core/flow_dissector.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 3410227..bb81e3b 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -125,6 +125,7 @@ enum flow_dissector_key_id {
};
#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
+#define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
struct flow_dissector_key {
enum flow_dissector_key_id key_id;
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 907de2f..94fd841 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -200,6 +200,9 @@ ip:
}
}
+ if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
+ goto out_good;
+
break;
}
case htons(ETH_P_IPV6): {
@@ -238,6 +241,9 @@ ipv6:
}
}
+ if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
+ goto out_good;
+
break;
}
case htons(ETH_P_8021AD):
--
1.8.1
--
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