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Commit 19469a87 authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

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: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 535fb8d0

net/core/flow_dissector.c

+17 −0
Original line number Diff line number Diff line
@@ -80,6 +80,8 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) 
	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 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) 
		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):