root/include/linux/ptp_classify.h

INCLUDED FROM

DEFINITIONS

1. ptp_classifier_init
2. ptp_classify_raw

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * PTP 1588 support
   4  *
   5  * This file implements a BPF that recognizes PTP event messages.
   6  *
   7  * Copyright (C) 2010 OMICRON electronics GmbH
   8  */
   9 
  10 #ifndef _PTP_CLASSIFY_H_
  11 #define _PTP_CLASSIFY_H_
  12 
  13 #include <linux/ip.h>
  14 #include <linux/skbuff.h>
  15 
  16 #define PTP_CLASS_NONE  0x00 /* not a PTP event message */
  17 #define PTP_CLASS_V1    0x01 /* protocol version 1 */
  18 #define PTP_CLASS_V2    0x02 /* protocol version 2 */
  19 #define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */
  20 #define PTP_CLASS_IPV4  0x10 /* event in an IPV4 UDP packet */
  21 #define PTP_CLASS_IPV6  0x20 /* event in an IPV6 UDP packet */
  22 #define PTP_CLASS_L2    0x40 /* event in a L2 packet */
  23 #define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */
  24 #define PTP_CLASS_VLAN  0x80 /* event in a VLAN tagged packet */
  25 
  26 #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4)
  27 #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */
  28 #define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4)
  29 #define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6)
  30 #define PTP_CLASS_V2_L2   (PTP_CLASS_V2 | PTP_CLASS_L2)
  31 #define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN)
  32 #define PTP_CLASS_L4      (PTP_CLASS_IPV4 | PTP_CLASS_IPV6)
  33 
  34 #define PTP_EV_PORT 319
  35 #define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */
  36 
  37 #define OFF_PTP_SOURCE_UUID     22 /* PTPv1 only */
  38 #define OFF_PTP_SEQUENCE_ID     30
  39 #define OFF_PTP_CONTROL         32 /* PTPv1 only */
  40 
  41 /* Below defines should actually be removed at some point in time. */
  42 #define IP6_HLEN        40
  43 #define UDP_HLEN        8
  44 #define OFF_IHL         14
  45 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
  46 
  47 #if defined(CONFIG_NET_PTP_CLASSIFY)
  48 /**
  49  * ptp_classify_raw - classify a PTP packet
  50  * @skb: buffer
  51  *
  52  * Runs a minimal BPF dissector to classify a network packet to
  53  * determine the PTP class. In case the skb does not contain any
  54  * PTP protocol data, PTP_CLASS_NONE will be returned, otherwise
  55  * PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or
  56  * PTP_CLASS_V2_{L2,VLAN}, depending on the packet content.
  57  */
  58 unsigned int ptp_classify_raw(const struct sk_buff *skb);
  59 
  60 void __init ptp_classifier_init(void);
  61 #else
  62 static inline void ptp_classifier_init(void)
  63 {
  64 }
  65 static inline unsigned int ptp_classify_raw(struct sk_buff *skb)
  66 {
  67         return PTP_CLASS_NONE;
  68 }
  69 #endif
  70 #endif /* _PTP_CLASSIFY_H_ */