/* * 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/ip.h> #include <linux/skbuff.h> #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 0x40 /* event in a L2 packet */ #define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */ #define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */ #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_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6) #define PTP_EV_PORT 319 #define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ #define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */ #define OFF_PTP_SEQUENCE_ID 30 #define OFF_PTP_CONTROL 32 /* PTPv1 only */ /* Below defines should actually be removed at some point in time. */ #define IP6_HLEN 40 #define UDP_HLEN 8 #define OFF_IHL 14 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) #if defined([31mCONFIG_NET_PTP_CLASSIFY[0m) /** * ptp_classify_raw - classify a PTP packet * @skb: buffer * * Runs a minimal BPF dissector to classify a network packet to * determine the PTP class. In case the skb does not contain any * PTP protocol data, PTP_CLASS_NONE will be returned, otherwise * PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or * PTP_CLASS_V2_{L2,VLAN}, depending on the packet content. */ unsigned int ptp_classify_raw(const struct sk_buff *skb); void __init ptp_classifier_init(void); #else static inline void ptp_classifier_init(void) { } #endif #endif /* _PTP_CLASSIFY_H_ */ |