flow_dissector: Use IPv6 flow label in flow_dissector (19469a87) · Commits · 戴 / test

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>

net/core/flow_dissector.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -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):

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