include/linux/ptp_classify.h

   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 #endif
  79 #endif /* _PTP_CLASSIFY_H_ */