netdev - [PATCH net-next 1/2] flow_dissector: add mpls support

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Date:   Mon, 27 Mar 2017 14:13:42 -0400
From:   Benjamin LaHaise <benjamin.lahaise@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 1/2] flow_dissector: add mpls support

Add support for parsing MPLS flows to the flow dissector in preparation for
adding MPLS match support to cls_flower.

Signed-off-by: Benjamin LaHaise <benjamin.lahaise@...ronome.com>
Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
Reviewed-by: Simon Horman <simon.horman@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index ac97030..00d704f 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -41,6 +41,13 @@ struct flow_dissector_key_vlan {
 	u16	padding;
 };
 
+struct flow_dissector_key_mpls {
+	u32	mpls_ttl : 8,
+		mpls_bos : 1,
+		mpls_tc : 3,
+		mpls_label : 20;
+};
+
 struct flow_dissector_key_keyid {
 	__be32	keyid;
 };
@@ -169,6 +176,7 @@ enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
 	FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
 	FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
+	FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */
 
 	FLOW_DISSECTOR_KEY_MAX,
 };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 5f3ae92..15185d8 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -126,9 +126,11 @@ __skb_flow_dissect_mpls(const struct sk_buff *skb,
 {
 	struct flow_dissector_key_keyid *key_keyid;
 	struct mpls_label *hdr, _hdr[2];
+	u32 entry, label;
 
 	if (!dissector_uses_key(flow_dissector,
-				FLOW_DISSECTOR_KEY_MPLS_ENTROPY))
+				FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
+	    !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 		return FLOW_DISSECT_RET_OUT_GOOD;
 
 	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
@@ -136,8 +138,25 @@ __skb_flow_dissect_mpls(const struct sk_buff *skb,
 	if (!hdr)
 		return FLOW_DISSECT_RET_OUT_BAD;
 
-	if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
-	    MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
+	entry = ntohl(hdr[0].entry);
+	label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
+
+	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
+		struct flow_dissector_key_mpls *key_mpls;
+
+		key_mpls = skb_flow_dissector_target(flow_dissector,
+						     FLOW_DISSECTOR_KEY_MPLS,
+						     target_container);
+		key_mpls->mpls_label = label;
+		key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
+					>> MPLS_LS_TTL_SHIFT;
+		key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
+					>> MPLS_LS_TC_SHIFT;
+		key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
+					>> MPLS_LS_S_SHIFT;
+	}
+
+	if (label == MPLS_LABEL_ENTROPY) {
 		key_keyid = skb_flow_dissector_target(flow_dissector,
 						      FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 						      target_container);