netdev - [PATCH 4/6] ptp: add api to get ptp seq id and event type from skb

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 17 Oct 2012 04:15:16 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	<netdev@...r.kernel.org>
CC:	<davem@...emloft.net>, Richard Cochran <richardcochran@...il.com>,
	Mugunthan V N <mugunthanvnm@...com>
Subject: [PATCH 4/6] ptp: add api to get ptp seq id and event type from skb

Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
---
 include/linux/ptp_classify.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
index 1dc420b..9b3b55b 100644
--- a/include/linux/ptp_classify.h
+++ b/include/linux/ptp_classify.h
@@ -137,4 +137,46 @@ static inline int ptp_filter_init(struct sock_filter *f, int len)
 	{OP_RETA,	0,   0, 0			}, /*              */ \
 /*L6x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		},
 
+static inline int ptp_get_skb_event(struct sk_buff *skb, u32 ptp_class,
+				    u16 *evt_seqid, u8 *evt_msgtype)
+{
+	u16 *seqid;
+	unsigned int offset;
+	u8 *msgtype, *data = skb->data;
+
+	switch (ptp_class) {
+	case PTP_CLASS_V1_IPV4:
+	case PTP_CLASS_V2_IPV4:
+		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
+		break;
+	case PTP_CLASS_V1_IPV6:
+	case PTP_CLASS_V2_IPV6:
+		offset = OFF_PTP6;
+		break;
+	case PTP_CLASS_V2_L2:
+		offset = ETH_HLEN;
+		break;
+	case PTP_CLASS_V2_VLAN:
+		offset = ETH_HLEN + VLAN_HLEN;
+		break;
+	default:
+		return 0;
+	}
+
+	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
+		return 0;
+
+	if (unlikely(ptp_class & PTP_CLASS_V1))
+		msgtype = data + offset + OFF_PTP_CONTROL;
+	else
+		msgtype = data + offset;
+
+	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
+
+	*evt_seqid = ntohs(*seqid);
+	*evt_msgtype = *msgtype & 0xf;
+
+	return 0;
+}
+
 #endif
-- 
1.7.0.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html