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151 lines
4.4 KiB
151 lines
4.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* PTP 1588 support |
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* |
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* This file implements a BPF that recognizes PTP event messages. |
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* |
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* Copyright (C) 2010 OMICRON electronics GmbH |
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*/ |
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#ifndef _PTP_CLASSIFY_H_ |
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#define _PTP_CLASSIFY_H_ |
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#include <linux/ip.h> |
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#include <linux/skbuff.h> |
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#define PTP_CLASS_NONE 0x00 /* not a PTP event message */ |
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#define PTP_CLASS_V1 0x01 /* protocol version 1 */ |
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#define PTP_CLASS_V2 0x02 /* protocol version 2 */ |
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#define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ |
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#define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ |
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#define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ |
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#define PTP_CLASS_L2 0x40 /* event in a L2 packet */ |
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#define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */ |
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#define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */ |
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#define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) |
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#define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */ |
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#define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) |
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#define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) |
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#define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) |
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#define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) |
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#define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6) |
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#define PTP_MSGTYPE_SYNC 0x0 |
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#define PTP_MSGTYPE_DELAY_REQ 0x1 |
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#define PTP_MSGTYPE_PDELAY_REQ 0x2 |
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#define PTP_MSGTYPE_PDELAY_RESP 0x3 |
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#define PTP_EV_PORT 319 |
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#define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ |
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#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */ |
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#define OFF_PTP_SEQUENCE_ID 30 |
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/* Below defines should actually be removed at some point in time. */ |
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#define IP6_HLEN 40 |
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#define UDP_HLEN 8 |
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#define OFF_IHL 14 |
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#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) |
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struct clock_identity { |
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u8 id[8]; |
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} __packed; |
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struct port_identity { |
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struct clock_identity clock_identity; |
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__be16 port_number; |
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} __packed; |
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struct ptp_header { |
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u8 tsmt; /* transportSpecific | messageType */ |
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u8 ver; /* reserved | versionPTP */ |
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__be16 message_length; |
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u8 domain_number; |
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u8 reserved1; |
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u8 flag_field[2]; |
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__be64 correction; |
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__be32 reserved2; |
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struct port_identity source_port_identity; |
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__be16 sequence_id; |
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u8 control; |
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u8 log_message_interval; |
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} __packed; |
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#if defined(CONFIG_NET_PTP_CLASSIFY) |
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/** |
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* ptp_classify_raw - classify a PTP packet |
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* @skb: buffer |
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* |
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* Runs a minimal BPF dissector to classify a network packet to |
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* determine the PTP class. In case the skb does not contain any |
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* PTP protocol data, PTP_CLASS_NONE will be returned, otherwise |
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* PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or |
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* PTP_CLASS_V2_{L2,VLAN}, depending on the packet content. |
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*/ |
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unsigned int ptp_classify_raw(const struct sk_buff *skb); |
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/** |
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* ptp_parse_header - Get pointer to the PTP v2 header |
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* @skb: packet buffer |
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* @type: type of the packet (see ptp_classify_raw()) |
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* |
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* This function takes care of the VLAN, UDP, IPv4 and IPv6 headers. The length |
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* is checked. |
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* |
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* Note, internally skb_mac_header() is used. Make sure that the @skb is |
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* initialized accordingly. |
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* |
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* Return: Pointer to the ptp v2 header or NULL if not found |
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*/ |
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struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type); |
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/** |
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* ptp_get_msgtype - Extract ptp message type from given header |
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* @hdr: ptp header |
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* @type: type of the packet (see ptp_classify_raw()) |
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* |
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* This function returns the message type for a given ptp header. It takes care |
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* of the different ptp header versions (v1 or v2). |
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* |
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* Return: The message type |
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*/ |
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static inline u8 ptp_get_msgtype(const struct ptp_header *hdr, |
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unsigned int type) |
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{ |
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u8 msgtype; |
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if (unlikely(type & PTP_CLASS_V1)) { |
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/* msg type is located at the control field for ptp v1 */ |
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msgtype = hdr->control; |
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} else { |
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msgtype = hdr->tsmt & 0x0f; |
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} |
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return msgtype; |
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} |
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void __init ptp_classifier_init(void); |
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#else |
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static inline void ptp_classifier_init(void) |
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{ |
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} |
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static inline unsigned int ptp_classify_raw(struct sk_buff *skb) |
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{ |
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return PTP_CLASS_NONE; |
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} |
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static inline struct ptp_header *ptp_parse_header(struct sk_buff *skb, |
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unsigned int type) |
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{ |
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return NULL; |
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} |
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static inline u8 ptp_get_msgtype(const struct ptp_header *hdr, |
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unsigned int type) |
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{ |
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/* The return is meaningless. The stub function would not be |
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* executed since no available header from ptp_parse_header. |
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*/ |
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return PTP_MSGTYPE_SYNC; |
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} |
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#endif |
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#endif /* _PTP_CLASSIFY_H_ */
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