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/ip.h> 27 #include <linux/skbuff.h> 28 29 #define PTP_CLASS_NONE 0x00 /* not a PTP event message */ 30 #define PTP_CLASS_V1 0x01 /* protocol version 1 */ 31 #define PTP_CLASS_V2 0x02 /* protocol version 2 */ 32 #define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ 33 #define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ 34 #define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ 35 #define PTP_CLASS_L2 0x40 /* event in a L2 packet */ 36 #define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */ 37 #define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */ 38 39 #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) 40 #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */ 41 #define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) 42 #define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) 43 #define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) 44 #define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) 45 #define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6) 46 47 #define PTP_EV_PORT 319 48 #define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ 49 50 #define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */ 51 #define OFF_PTP_SEQUENCE_ID 30 52 #define OFF_PTP_CONTROL 32 /* PTPv1 only */ 53 54 /* Below defines should actually be removed at some point in time. */ 55 #define IP6_HLEN 40 56 #define UDP_HLEN 8 57 #define OFF_IHL 14 58 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) 59 60 #if defined(CONFIG_NET_PTP_CLASSIFY) 61 /** 62 * ptp_classify_raw - classify a PTP packet 63 * @skb: buffer 64 * 65 * Runs a minimal BPF dissector to classify a network packet to 66 * determine the PTP class. In case the skb does not contain any 67 * PTP protocol data, PTP_CLASS_NONE will be returned, otherwise 68 * PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or 69 * PTP_CLASS_V2_{L2,VLAN}, depending on the packet content. 70 */ 71 unsigned int ptp_classify_raw(const struct sk_buff *skb); 72 73 void __init ptp_classifier_init(void); 74 #else 75 static inline void ptp_classifier_init(void) 76 { 77 } 78 static inline unsigned int ptp_classify_raw(struct sk_buff *skb) 79 { 80 return PTP_CLASS_NONE; 81 } 82 #endif 83 #endif /* _PTP_CLASSIFY_H_ */ 84