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ptp: fix L2 event message recognition

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The IEEE 1588 standard defines two kinds of messages, event and general
messages. Event messages require time stamping, and general do not. When
using UDP transport, two separate ports are used for the two message
types.

The BPF designed to recognize event messages incorrectly classifies L2
general messages as event messages. This commit fixes the issue by
extending the filter to check the message type field for L2 PTP packets.
Event messages are be distinguished from general messages by testing
the "general" bit.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Cc: <stable@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2011-09-20 01:25:41 +00:00 committed by David S. Miller
parent d5767c5353
commit f75159e993
1 changed files with 10 additions and 3 deletions
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13
include/linux/ptp_classify.h
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@ -51,6 +51,7 @@
#define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN)
#define PTP_EV_PORT 319
#define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */
#define OFF_ETYPE 12
#define OFF_IHL 14
@ -116,14 +117,20 @@ static inline int ptp_filter_init(struct sock_filter *f, int len)
{OP_OR, 0, 0, PTP_CLASS_IPV6 }, /* */ \
{OP_RETA, 0, 0, 0 }, /* */ \
/*L3x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, /* */ \
/*L40*/ {OP_JEQ, 0, 6, ETH_P_8021Q }, /* f goto L50 */ \
/*L40*/ {OP_JEQ, 0, 9, ETH_P_8021Q }, /* f goto L50 */ \
{OP_LDH, 0, 0, OFF_ETYPE + 4 }, /* */ \
{OP_JEQ, 0, 9, ETH_P_1588 }, /* f goto L60 */ \
{OP_JEQ, 0, 15, ETH_P_1588 }, /* f goto L60 */ \
{OP_LDB, 0, 0, ETH_HLEN + VLAN_HLEN }, /* */ \
{OP_AND, 0, 0, PTP_GEN_BIT }, /* */ \
{OP_JEQ, 0, 12, 0 }, /* f goto L6x */ \
{OP_LDH, 0, 0, ETH_HLEN + VLAN_HLEN }, /* */ \
{OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \
{OP_OR, 0, 0, PTP_CLASS_VLAN }, /* */ \
{OP_RETA, 0, 0, 0 }, /* */ \
/*L50*/ {OP_JEQ, 0, 4, ETH_P_1588 }, /* f goto L61 */ \
/*L50*/ {OP_JEQ, 0, 7, ETH_P_1588 }, /* f goto L61 */ \
{OP_LDB, 0, 0, ETH_HLEN }, /* */ \
{OP_AND, 0, 0, PTP_GEN_BIT }, /* */ \
{OP_JEQ, 0, 4, 0 }, /* f goto L6x */ \
{OP_LDH, 0, 0, ETH_HLEN }, /* */ \
{OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \
{OP_OR, 0, 0, PTP_CLASS_L2 }, /* */ \