From: Tom Herbert <therbert@google.com>
Date: Wed, 2 Jul 2014 04:33:01 +0000 (-0700)
Subject: flow_dissector: Use IPv6 flow label in flow_dissector
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=19469a873bafd4e65daef3597db2bd724c1b03c9;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

flow_dissector: Use IPv6 flow label in flow_dissector

This patch implements the receive side to support RFC 6438 which is to
use the flow label as an ECMP hash. If an IPv6 flow label is set
in a packet we can use this as input for computing an L4-hash. There
should be no need to parse any transport headers in this case.

Signed-off-by: Tom Herbert <therbert@google.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 62d1cb624f53..c5f3912dad4c 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -80,6 +80,8 @@ ip:
 	case htons(ETH_P_IPV6): {
 		const struct ipv6hdr *iph;
 		struct ipv6hdr _iph;
+		__be32 flow_label;
+
 ipv6:
 		iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
 		if (!iph)
@@ -89,6 +91,21 @@ ipv6:
 		flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
 		flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
 		nhoff += sizeof(struct ipv6hdr);
+
+		flow_label = ip6_flowlabel(iph);
+		if (flow_label) {
+			/* Awesome, IPv6 packet has a flow label so we can
+			 * use that to represent the ports without any
+			 * further dissection.
+			 */
+			flow->n_proto = proto;
+			flow->ip_proto = ip_proto;
+			flow->ports = flow_label;
+			flow->thoff = (u16)nhoff;
+
+			return true;
+		}
+
 		break;
 	}
 	case htons(ETH_P_8021AD):