netdev - [PATCH net-next v4 2/2] net: flow_dissector: Parse PTP L2 packet header

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Date:   Tue, 12 Jan 2021 21:07:13 +0200
From:   Eran Ben Elisha <eranbe@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jiri Pirko <jiri@...dia.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Guillaume Nault <gnault@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Alexei Starovoitov <ast@...nel.org>,
        Ariel Levkovich <lariel@...lanox.com>,
        Andrii Nakryiko <andriin@...com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        "Eran Ben Elisha" <eranbe@...dia.com>
Subject: [PATCH net-next v4 2/2] net: flow_dissector: Parse PTP L2 packet header

Add support for parsing PTP L2 packet header. Such packet consists
of an L2 header (with ethertype of ETH_P_1588), PTP header, body
and an optional suffix.

Signed-off-by: Eran Ben Elisha <eranbe@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 net/core/flow_dissector.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 6f1adba6695f..2d70ded389ae 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -23,6 +23,7 @@
 #include <linux/if_ether.h>
 #include <linux/mpls.h>
 #include <linux/tcp.h>
+#include <linux/ptp_classify.h>
 #include <net/flow_dissector.h>
 #include <scsi/fc/fc_fcoe.h>
 #include <uapi/linux/batadv_packet.h>
@@ -1251,6 +1252,21 @@ bool __skb_flow_dissect(const struct net *net,
 						  &proto, &nhoff, hlen, flags);
 		break;
 
+	case htons(ETH_P_1588): {
+		struct ptp_header *hdr, _hdr;
+
+		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
+					   hlen, &_hdr);
+		if (!hdr) {
+			fdret = FLOW_DISSECT_RET_OUT_BAD;
+			break;
+		}
+
+		nhoff += ntohs(hdr->message_length);
+		fdret = FLOW_DISSECT_RET_OUT_GOOD;
+		break;
+	}
+
 	default:
 		fdret = FLOW_DISSECT_RET_OUT_BAD;
 		break;
-- 
2.17.1