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flow: Add helper to determine a flow's protocol

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Each flow already has a type field.  This implies the protocol the
flow represents, but also has more information: we have two ways to
represent TCP flows, "tap" and "spliced".  In order to generalise some
of the flow mechanics, we'll need to determine a flow's protocol in
terms of the IP (L4) protocol number.

Introduce a constant table and helper macro to derive this from the flow
type.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson
2024-02-28 22:25:07 +11:00
committed by Stefano Brivio
parent bb9bf0bb8f
commit 76c7e1dca3
2 changed files with 11 additions and 0 deletions
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4
flow.h
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@@ -27,6 +27,10 @@ extern const char *flow_type_str[];
#define FLOW_TYPE(f) \
((f)->type < FLOW_NUM_TYPES ? flow_type_str[(f)->type] : "?")
extern const uint8_t flow_proto[];
#define FLOW_PROTO(f) \
((f)->type < FLOW_NUM_TYPES ? flow_proto[(f)->type] : 0)
/**
* struct flow_common - Common fields for packet flows
* @type: Type of packet flow