Edit File: 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