From 539e44d26855fdd198280ee41360a0b3adcf699b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Stefan=20S=C3=B8rensen?= Date: Tue, 3 Nov 2015 09:34:04 +0100 Subject: [PATCH] dp83640: Include hash in timestamp/packet matching MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Only using the message type and sequence id for matching timestamps with packets is error prone, as multiple clients may very well be sending packets with the same messagetype and timestamp at the same time. Fix by extending the check to include the hash of bytes 20-29 (source id in PTPv2) that is provided with the timestamps. Signed-off-by: Stefan Sørensen Signed-off-by: David S. Miller --- drivers/net/phy/dp83640.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c index 185b03c08e16..cae3b3b3ea3c 100644 --- a/drivers/net/phy/dp83640.c +++ b/drivers/net/phy/dp83640.c @@ -20,6 +20,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -787,9 +788,12 @@ static int decode_evnt(struct dp83640_private *dp83640, return parsed; } +#define DP83640_PACKET_HASH_OFFSET 20 +#define DP83640_PACKET_HASH_LEN 10 + static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts) { - u16 *seqid; + u16 *seqid, hash; unsigned int offset = 0; u8 *msgtype, *data = skb_mac_header(skb); @@ -819,11 +823,19 @@ static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts) msgtype = data + offset + OFF_PTP_CONTROL; else msgtype = data + offset; + if (rxts->msgtype != (*msgtype & 0xf)) + return 0; seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID); + if (rxts->seqid != ntohs(*seqid)) + return 0; + + hash = ether_crc(DP83640_PACKET_HASH_LEN, + data + offset + DP83640_PACKET_HASH_OFFSET) >> 20; + if (rxts->hash != hash) + return 0; - return rxts->msgtype == (*msgtype & 0xf) && - rxts->seqid == ntohs(*seqid); + return 1; } static void decode_rxts(struct dp83640_private *dp83640, -- 2.20.1