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flow_dissector: Add control/reporting of fragmentation

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Add an input flag to flow dissector on rather dissection should be
attempted on a first fragment. Also add key_control flags to indicate
that a packet is a fragment or first fragment.

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 09:24:28 -07:00
committed by David S. Miller
parent cd79a2382a
commit 807e165dc4
2 changed files with 17 additions and 2 deletions
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net/core/flow_dissector.c
+13 -2
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@@ -177,8 +177,6 @@ ip:
nhoff += iph->ihl * 4;
ip_proto = iph->protocol;
if (ip_is_fragment(iph))
ip_proto = 0;
if (!skb_flow_dissector_uses_key(flow_dissector,
FLOW_DISSECTOR_KEY_IPV4_ADDRS))
@@ -189,6 +187,19 @@ ip:
memcpy(&key_addrs->v4addrs, &iph->saddr,
sizeof(key_addrs->v4addrs));
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
if (ip_is_fragment(iph)) {
key_control->is_fragment = 1;
if (iph->frag_off & htons(IP_OFFSET)) {
goto out_good;
} else {
key_control->first_frag = 1;
if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
goto out_good;
}
}
break;
}
case htons(ETH_P_IPV6): {