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flow_dissector: Add flag to stop parsing at L3 

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 <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-09-01 09:24:30 -07:00 committed by David S. Miller
parent b840f28b90
commit 8306b688f1
2 changed files with 7 additions and 0 deletions
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1
include/net/flow_dissector.h
View File

@ -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;

6
net/core/flow_dissector.c
View File

@ -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):