[PATCH v4 net-next 11/11] mpls: Add MPLS entropy label in flow_keys

[Tom Herbert]

In flow dissector if an MPLS header contains an entropy label this is
saved in the new keyid field of flow_keys. The entropy label is
then represented in the flow hash function input.

Signed-off-by: Tom Herbert <t...@herbertland.com>
---
 include/net/flow_dissector.h |  1 +
 net/core/flow_dissector.c    | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index f9a3084..65db4eb 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -118,6 +118,7 @@ enum flow_dissector_key_id {
        FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
        FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_label 
*/
        FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
+       FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
 
        FLOW_DISSECTOR_KEY_MAX,
 };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 20ce55d..da4e895 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -15,6 +15,7 @@
 #include <linux/ppp_defs.h>
 #include <linux/stddef.h>
 #include <linux/if_ether.h>
+#include <linux/mpls.h>
 #include <net/flow_dissector.h>
 #include <scsi/fc/fc_fcoe.h>
 
@@ -286,6 +287,39 @@ ipv6:
                }
                return true;
        }
+
+       case htons(ETH_P_MPLS_UC):
+       case htons(ETH_P_MPLS_MC): {
+               struct mpls_label *hdr, _hdr[2];
+mpls:
+               hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
+                                          hlen, &_hdr);
+               if (!hdr)
+                       return false;
+
+               if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) ==
+                    MPLS_LABEL_ENTROPY) {
+                       if (skb_flow_dissector_uses_key(
+                                       flow_dissector,
+                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
+                               key_keyid = skb_flow_dissector_target(
+                                       flow_dissector,
+                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
+                                       target_container);
+                               key_keyid->keyid = ntohl(hdr[1].entry) &
+                                       MPLS_LS_LABEL_MASK;
+                       }
+
+                       key_basic->n_proto = proto;
+                       key_basic->ip_proto = ip_proto;
+                       key_control->thoff = (u16)nhoff;
+
+                       return true;
+               }
+
+               return true;
+       }
+
        case htons(ETH_P_FCOE):
                key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
                /* fall through */
@@ -356,6 +390,9 @@ ipv6:
        case IPPROTO_IPV6:
                proto = htons(ETH_P_IPV6);
                goto ipv6;
+       case IPPROTO_MPLS:
+               proto = htons(ETH_P_MPLS_UC);
+               goto mpls;
        default:
                break;
        }
-- 
1.8.1

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