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Current Path : /lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/
Linux 43-225-53-84.webhostbox.net 3.10.0-1160.92.1.el7.x86_64 #1 SMP Tue Jun 20 11:48:01 UTC 2023 x86_64
Current File : //lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/ptp_classify.h
/*
 * PTP 1588 support
 *
 * This file implements a BPF that recognizes PTP event messages.
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _PTP_CLASSIFY_H_
#define _PTP_CLASSIFY_H_

#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/filter.h>
#ifdef __KERNEL__
#include <linux/in.h>
#else
#include <netinet/in.h>
#endif

#define PTP_CLASS_NONE  0x00 /* not a PTP event message */
#define PTP_CLASS_V1    0x01 /* protocol version 1 */
#define PTP_CLASS_V2    0x02 /* protocol version 2 */
#define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */
#define PTP_CLASS_IPV4  0x10 /* event in an IPV4 UDP packet */
#define PTP_CLASS_IPV6  0x20 /* event in an IPV6 UDP packet */
#define PTP_CLASS_L2    0x30 /* event in a L2 packet */
#define PTP_CLASS_VLAN  0x40 /* event in a VLAN tagged L2 packet */
#define PTP_CLASS_PMASK 0xf0 /* mask for the packet type field */

#define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4)
#define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /*probably DNE*/
#define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4)
#define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6)
#define PTP_CLASS_V2_L2   (PTP_CLASS_V2 | PTP_CLASS_L2)
#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
#define OFF_FRAG	20
#define OFF_PROTO4	23
#define OFF_NEXT	6
#define OFF_UDP_DST	2

#define OFF_PTP_SOURCE_UUID	22 /* PTPv1 only */
#define OFF_PTP_SEQUENCE_ID	30
#define OFF_PTP_CONTROL		32 /* PTPv1 only */

#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)

#define IP6_HLEN	40
#define UDP_HLEN	8

#define RELOFF_DST4	(ETH_HLEN + OFF_UDP_DST)
#define OFF_DST6	(ETH_HLEN + IP6_HLEN + OFF_UDP_DST)
#define OFF_PTP6	(ETH_HLEN + IP6_HLEN + UDP_HLEN)

#define OP_AND	(BPF_ALU | BPF_AND  | BPF_K)
#define OP_JEQ	(BPF_JMP | BPF_JEQ  | BPF_K)
#define OP_JSET	(BPF_JMP | BPF_JSET | BPF_K)
#define OP_LDB	(BPF_LD  | BPF_B    | BPF_ABS)
#define OP_LDH	(BPF_LD  | BPF_H    | BPF_ABS)
#define OP_LDHI	(BPF_LD  | BPF_H    | BPF_IND)
#define OP_LDX	(BPF_LDX | BPF_B    | BPF_MSH)
#define OP_OR	(BPF_ALU | BPF_OR   | BPF_K)
#define OP_RETA	(BPF_RET | BPF_A)
#define OP_RETK	(BPF_RET | BPF_K)

static inline int ptp_filter_init(struct sock_filter *f, int len)
{
	if (OP_LDH == f[0].code)
		return sk_chk_filter(f, len);
	else
		return 0;
}

#define PTP_FILTER \
	{OP_LDH,	0,   0, OFF_ETYPE		}, /*              */ \
	{OP_JEQ,	0,  12, ETH_P_IP		}, /* f goto L20   */ \
	{OP_LDB,	0,   0, OFF_PROTO4		}, /*              */ \
	{OP_JEQ,	0,   9, IPPROTO_UDP		}, /* f goto L10   */ \
	{OP_LDH,	0,   0, OFF_FRAG		}, /*              */ \
	{OP_JSET,	7,   0, 0x1fff			}, /* t goto L11   */ \
	{OP_LDX,	0,   0, OFF_IHL			}, /*              */ \
	{OP_LDHI,	0,   0, RELOFF_DST4		}, /*              */ \
	{OP_JEQ,	0,   4, PTP_EV_PORT		}, /* f goto L12   */ \
	{OP_LDHI,	0,   0, ETH_HLEN + UDP_HLEN	}, /*              */ \
	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
	{OP_OR,		0,   0, PTP_CLASS_IPV4		}, /*              */ \
	{OP_RETA,	0,   0, 0			}, /*              */ \
/*L1x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		}, /*              */ \
/*L20*/	{OP_JEQ,	0,   9, ETH_P_IPV6		}, /* f goto L40   */ \
	{OP_LDB,	0,   0, ETH_HLEN + OFF_NEXT	}, /*              */ \
	{OP_JEQ,	0,   6, IPPROTO_UDP		}, /* f goto L30   */ \
	{OP_LDH,	0,   0, OFF_DST6		}, /*              */ \
	{OP_JEQ,	0,   4, PTP_EV_PORT		}, /* f goto L31   */ \
	{OP_LDH,	0,   0, OFF_PTP6		}, /*              */ \
	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
	{OP_OR,		0,   0, PTP_CLASS_IPV6		}, /*              */ \
	{OP_RETA,	0,   0, 0			}, /*              */ \
/*L3x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		}, /*              */ \
/*L40*/	{OP_JEQ,	0,   9, ETH_P_8021Q		}, /* f goto L50   */ \
	{OP_LDH,	0,   0, OFF_ETYPE + 4		}, /*              */ \
	{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,   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		}, /*              */ \
	{OP_RETA,	0,   0, 0			}, /*              */ \
/*L6x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		},

#endif
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