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net: Add IPv6 flow label to flow_keys 

In flow_dissector set the flow label in flow_keys for IPv6. This also
removes the shortcircuiting of flow dissection when a non-zero label
is present, the flow label can be considered to provide additional
entropy for a hash.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-06-04 09:16:44 -07:00 committed by David S. Miller
parent d34af823ff
commit 87ee9e52ff
2 changed files with 13 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/flow_dissector.h
View File

@ -28,7 +28,8 @@ struct flow_dissector_key_basic {
};
struct flow_dissector_key_tags {
u32 vlan_id:12;
u32 vlan_id:12,
flow_label:20;
};
/**
@ -111,6 +112,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
FLOW_DISSECTOR_KEY_MAX,
};

29
net/core/flow_dissector.c
View File

@ -210,30 +210,17 @@ ipv6:
memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs));
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
goto flow_label;
}
break;
flow_label:
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.
*/
key_basic->n_proto = proto;
key_basic->ip_proto = ip_proto;
key_control->thoff = (u16)nhoff;
if (skb_flow_dissector_uses_key(flow_dissector,
FLOW_DISSECTOR_KEY_PORTS)) {
key_ports = skb_flow_dissector_target(flow_dissector,
FLOW_DISSECTOR_KEY_PORTS,
target_container);
key_ports->ports = flow_label;
FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
key_tags = skb_flow_dissector_target(flow_dissector,
FLOW_DISSECTOR_KEY_FLOW_LABEL,
target_container);
key_tags->flow_label = ntohl(flow_label);
}
return true;
}
break;
@ -659,6 +646,10 @@ static const struct flow_dissector_key flow_keys_dissector_keys[] = {
.key_id = FLOW_DISSECTOR_KEY_VLANID,
.offset = offsetof(struct flow_keys, tags),
},
{
.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
.offset = offsetof(struct flow_keys, tags),
},
};
static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {