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

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
...@@ -80,6 +80,8 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) ...@@ -80,6 +80,8 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
case htons(ETH_P_IPV6): { case htons(ETH_P_IPV6): {
const struct ipv6hdr *iph; const struct ipv6hdr *iph;
struct ipv6hdr _iph; struct ipv6hdr _iph;
__be32 flow_label;
ipv6: ipv6:
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
if (!iph) if (!iph)
...@@ -89,6 +91,21 @@ bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) ...@@ -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->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr); flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
nhoff += sizeof(struct ipv6hdr); 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; break;
} }
case htons(ETH_P_8021AD): case htons(ETH_P_8021AD):
......
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