flow_dissector: Add control/reporting of encapsulation
Add an input flag to flow dissector on rather dissection should stop
when encapsulation is detected (IP/IP or GRE). Also, add a key_control
flag that indicates encapsulation was encountered during the
dissection.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 094e343..8d89013 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -397,6 +397,11 @@
proto = eth->h_proto;
nhoff += sizeof(*eth);
}
+
+ key_control->encapsulation = 1;
+ if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
+ goto out_good;
+
goto again;
}
case NEXTHDR_HOP:
@@ -444,9 +449,19 @@
}
case IPPROTO_IPIP:
proto = htons(ETH_P_IP);
+
+ key_control->encapsulation = 1;
+ if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
+ goto out_good;
+
goto ip;
case IPPROTO_IPV6:
proto = htons(ETH_P_IPV6);
+
+ key_control->encapsulation = 1;
+ if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
+ goto out_good;
+
goto ipv6;
case IPPROTO_MPLS:
proto = htons(ETH_P_MPLS_UC);