1 /* 2 * PTP 1588 support 3 * 4 * This file implements a BPF that recognizes PTP event messages. 5 * 6 * Copyright (C) 2010 OMICRON electronics GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #ifndef _PTP_CLASSIFY_H_ 24 #define _PTP_CLASSIFY_H_ 25 26 #include <linux/if_ether.h> 27 #include <linux/if_vlan.h> 28 #include <linux/filter.h> 29 #ifdef __KERNEL__ 30 #include <linux/in.h> 31 #else 32 #include <netinet/in.h> 33 #endif 34 35 #define PTP_CLASS_NONE 0x00 /* not a PTP event message */ 36 #define PTP_CLASS_V1 0x01 /* protocol version 1 */ 37 #define PTP_CLASS_V2 0x02 /* protocol version 2 */ 38 #define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ 39 #define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ 40 #define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ 41 #define PTP_CLASS_L2 0x30 /* event in a L2 packet */ 42 #define PTP_CLASS_VLAN 0x40 /* event in a VLAN tagged L2 packet */ 43 #define PTP_CLASS_PMASK 0xf0 /* mask for the packet type field */ 44 45 #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) 46 #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /*probably DNE*/ 47 #define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) 48 #define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) 49 #define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) 50 #define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) 51 52 #define PTP_EV_PORT 319 53 54 #define OFF_ETYPE 12 55 #define OFF_IHL 14 56 #define OFF_FRAG 20 57 #define OFF_PROTO4 23 58 #define OFF_NEXT 6 59 #define OFF_UDP_DST 2 60 61 #define IP6_HLEN 40 62 #define UDP_HLEN 8 63 64 #define RELOFF_DST4 (ETH_HLEN + OFF_UDP_DST) 65 #define OFF_DST6 (ETH_HLEN + IP6_HLEN + OFF_UDP_DST) 66 #define OFF_PTP6 (ETH_HLEN + IP6_HLEN + UDP_HLEN) 67 68 #define OP_AND (BPF_ALU | BPF_AND | BPF_K) 69 #define OP_JEQ (BPF_JMP | BPF_JEQ | BPF_K) 70 #define OP_JSET (BPF_JMP | BPF_JSET | BPF_K) 71 #define OP_LDB (BPF_LD | BPF_B | BPF_ABS) 72 #define OP_LDH (BPF_LD | BPF_H | BPF_ABS) 73 #define OP_LDHI (BPF_LD | BPF_H | BPF_IND) 74 #define OP_LDX (BPF_LDX | BPF_B | BPF_MSH) 75 #define OP_OR (BPF_ALU | BPF_OR | BPF_K) 76 #define OP_RETA (BPF_RET | BPF_A) 77 #define OP_RETK (BPF_RET | BPF_K) 78 79 static inline int ptp_filter_init(struct sock_filter *f, int len) 80 { 81 if (OP_LDH == f[0].code) 82 return sk_chk_filter(f, len); 83 else 84 return 0; 85 } 86 87 #define PTP_FILTER \ 88 {OP_LDH, 0, 0, OFF_ETYPE }, /* */ \ 89 {OP_JEQ, 0, 12, ETH_P_IP }, /* f goto L20 */ \ 90 {OP_LDB, 0, 0, OFF_PROTO4 }, /* */ \ 91 {OP_JEQ, 0, 9, IPPROTO_UDP }, /* f goto L10 */ \ 92 {OP_LDH, 0, 0, OFF_FRAG }, /* */ \ 93 {OP_JSET, 7, 0, 0x1fff }, /* t goto L11 */ \ 94 {OP_LDX, 0, 0, OFF_IHL }, /* */ \ 95 {OP_LDHI, 0, 0, RELOFF_DST4 }, /* */ \ 96 {OP_JEQ, 0, 4, PTP_EV_PORT }, /* f goto L12 */ \ 97 {OP_LDHI, 0, 0, ETH_HLEN + UDP_HLEN }, /* */ \ 98 {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ 99 {OP_OR, 0, 0, PTP_CLASS_IPV4 }, /* */ \ 100 {OP_RETA, 0, 0, 0 }, /* */ \ 101 /*L1x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, /* */ \ 102 /*L20*/ {OP_JEQ, 0, 9, ETH_P_IPV6 }, /* f goto L40 */ \ 103 {OP_LDB, 0, 0, ETH_HLEN + OFF_NEXT }, /* */ \ 104 {OP_JEQ, 0, 6, IPPROTO_UDP }, /* f goto L30 */ \ 105 {OP_LDH, 0, 0, OFF_DST6 }, /* */ \ 106 {OP_JEQ, 0, 4, PTP_EV_PORT }, /* f goto L31 */ \ 107 {OP_LDH, 0, 0, OFF_PTP6 }, /* */ \ 108 {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ 109 {OP_OR, 0, 0, PTP_CLASS_IPV6 }, /* */ \ 110 {OP_RETA, 0, 0, 0 }, /* */ \ 111 /*L3x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, /* */ \ 112 /*L40*/ {OP_JEQ, 0, 6, ETH_P_8021Q }, /* f goto L50 */ \ 113 {OP_LDH, 0, 0, OFF_ETYPE + 4 }, /* */ \ 114 {OP_JEQ, 0, 9, ETH_P_1588 }, /* f goto L60 */ \ 115 {OP_LDH, 0, 0, ETH_HLEN + VLAN_HLEN }, /* */ \ 116 {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ 117 {OP_OR, 0, 0, PTP_CLASS_VLAN }, /* */ \ 118 {OP_RETA, 0, 0, 0 }, /* */ \ 119 /*L50*/ {OP_JEQ, 0, 4, ETH_P_1588 }, /* f goto L61 */ \ 120 {OP_LDH, 0, 0, ETH_HLEN }, /* */ \ 121 {OP_AND, 0, 0, PTP_CLASS_VMASK }, /* */ \ 122 {OP_OR, 0, 0, PTP_CLASS_L2 }, /* */ \ 123 {OP_RETA, 0, 0, 0 }, /* */ \ 124 /*L6x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE }, 125 126 #endif 127