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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>
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1 changed files with 17 additions and 0 deletions
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@ -80,6 +80,8 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
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case htons(ETH_P_IPV6): {
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case htons(ETH_P_IPV6): {
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const struct ipv6hdr *iph;
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const struct ipv6hdr *iph;
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struct ipv6hdr _iph;
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struct ipv6hdr _iph;
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__be32 flow_label;
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ipv6:
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ipv6:
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iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
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iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
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if (!iph)
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if (!iph)
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@ -89,6 +91,21 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
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flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
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flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
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flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
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flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
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nhoff += sizeof(struct ipv6hdr);
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nhoff += sizeof(struct ipv6hdr);
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flow_label = ip6_flowlabel(iph);
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if (flow_label) {
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/* Awesome, IPv6 packet has a flow label so we can
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* use that to represent the ports without any
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* further dissection.
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*/
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flow->n_proto = proto;
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flow->ip_proto = ip_proto;
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flow->ports = flow_label;
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flow->thoff = (u16)nhoff;
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return true;
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}
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break;
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break;
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}
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}
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case htons(ETH_P_8021AD):
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case htons(ETH_P_8021AD):
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