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| author | Tom Herbert <therbert@google.com> | 2014-07-01 21:33:01 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-07-07 21:14:21 -0700 |
| commit | 19469a873bafd4e65daef3597db2bd724c1b03c9 (patch) | |
| tree | c413b1130aaf9e5c70a7d378508684f5c72e3320 | |
| parent | 535fb8d006bc6a96d59558181a9a6f267be382c5 (diff) | |
| download | blackbird-op-linux-19469a873bafd4e65daef3597db2bd724c1b03c9.tar.gz blackbird-op-linux-19469a873bafd4e65daef3597db2bd724c1b03c9.zip | |
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>
| -rw-r--r-- | net/core/flow_dissector.c | 17 |
1 files changed, 17 insertions, 0 deletions
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): |
