net/hsr/hsr_main.h - third_party/kernel - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
  *
  * include file for HSR and PRP.
  */

 #ifndef __HSR_PRIVATE_H
 #define __HSR_PRIVATE_H

 #include <linux/netdevice.h>
 #include <linux/list.h>
 #include <linux/if_vlan.h>
 #include <linux/if_hsr.h>

 /* Time constants as specified in the HSR specification (IEC-62439-3 2010)
  * Table 8.
  * All values in milliseconds.
  */
 #define HSR_LIFE_CHECK_INTERVAL		 2000 /* ms */
 #define HSR_NODE_FORGET_TIME		60000 /* ms */
 #define HSR_ANNOUNCE_INTERVAL		  100 /* ms */
 #define HSR_ENTRY_FORGET_TIME		  400 /* ms */

 /* By how much may slave1 and slave2 timestamps of latest received frame from
  * each node differ before we notify of communication problem?
  */
 #define MAX_SLAVE_DIFF			 3000 /* ms */
 #define HSR_SEQNR_START			(USHRT_MAX - 1024)
 #define HSR_SUP_SEQNR_START		(HSR_SEQNR_START / 2)

 /* How often shall we check for broken ring and remove node entries older than
  * HSR_NODE_FORGET_TIME?
  */
 #define PRUNE_PERIOD			 3000 /* ms */

 #define HSR_TLV_ANNOUNCE		   22
 #define HSR_TLV_LIFE_CHECK		   23
 /* PRP V1 life check for Duplicate discard */
 #define PRP_TLV_LIFE_CHECK_DD		   20
 /* PRP V1 life check for Duplicate Accept */
 #define PRP_TLV_LIFE_CHECK_DA		   21

 /* HSR Tag.
  * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
  * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
  * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
  * encapsulated protocol } instead.
  *
  * Field names as defined in the IEC:2010 standard for HSR.
  */
 struct hsr_tag {
 	__be16		path_and_LSDU_size;
 	__be16		sequence_nr;
 	__be16		encap_proto;
 } __packed;

 #define HSR_HLEN	6

 #define HSR_V1_SUP_LSDUSIZE		52

 /* The helper functions below assumes that 'path' occupies the 4 most
  * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
  * equivalently, the 4 most significant bits of HSR tag byte 14).
  *
  * This is unclear in the IEC specification; its definition of MAC addresses
  * indicates the spec is written with the least significant bit first (to the
  * left). This, however, would mean that the LSDU field would be split in two
  * with the path field in-between, which seems strange. I'm guessing the MAC
  * address definition is in error.
  */

 static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
 {
 	ht->path_and_LSDU_size =
 		htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
 }

 static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
 {
 	ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
 				       0xF000) | (LSDU_size & 0x0FFF));
 }

 struct hsr_ethhdr {
 	struct ethhdr	ethhdr;
 	struct hsr_tag	hsr_tag;
 } __packed;

 struct hsr_vlan_ethhdr {
 	struct vlan_ethhdr vlanhdr;
 	struct hsr_tag	hsr_tag;
 } __packed;

 /* HSR/PRP Supervision Frame data types.
  * Field names as defined in the IEC:2010 standard for HSR.
  */
 struct hsr_sup_tag {
 	__be16		path_and_HSR_ver;
 	__be16		sequence_nr;
 	__u8		HSR_TLV_type;
 	__u8		HSR_TLV_length;
 } __packed;

 struct hsr_sup_payload {
 	unsigned char	macaddress_A[ETH_ALEN];
 } __packed;

 static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
 {
 	set_hsr_tag_path((struct hsr_tag *)hst, path);
 }

 static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
 {
 	set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
 }

 struct hsrv0_ethhdr_sp {
 	struct ethhdr		ethhdr;
 	struct hsr_sup_tag	hsr_sup;
 } __packed;

 struct hsrv1_ethhdr_sp {
 	struct ethhdr		ethhdr;
 	struct hsr_tag		hsr;
 	struct hsr_sup_tag	hsr_sup;
 } __packed;

 enum hsr_port_type {
 	HSR_PT_NONE = 0,	/* Must be 0, used by framereg */
 	HSR_PT_SLAVE_A,
 	HSR_PT_SLAVE_B,
 	HSR_PT_INTERLINK,
 	HSR_PT_MASTER,
 	HSR_PT_PORTS,	/* This must be the last item in the enum */
 };

 /* PRP Redunancy Control Trailor (RCT).
  * As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
  * Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
  *
  * Field names as defined in the IEC:2012 standard for PRP.
  */
 struct prp_rct {
 	__be16          sequence_nr;
 	__be16          lan_id_and_LSDU_size;
 	__be16          PRP_suffix;
 } __packed;

 static inline u16 get_prp_LSDU_size(struct prp_rct *rct)
 {
 	return ntohs(rct->lan_id_and_LSDU_size) & 0x0FFF;
 }

 static inline void set_prp_lan_id(struct prp_rct *rct, u16 lan_id)
 {
 	rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
 					  0x0FFF) | (lan_id << 12));
 }
 static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
 {
 	rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
 					  0xF000) | (LSDU_size & 0x0FFF));
 }

 struct hsr_port {
 	struct list_head	port_list;
 	struct net_device	*dev;
 	struct hsr_priv		*hsr;
 	enum hsr_port_type	type;
 };

 struct hsr_frame_info;
 struct hsr_node;

 struct hsr_proto_ops {
 	/* format and send supervision frame */
 	void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval);
 	void (*handle_san_frame)(bool san, enum hsr_port_type port,
 				 struct hsr_node *node);
 	bool (*drop_frame)(struct hsr_frame_info *frame, struct hsr_port *port);
 	struct sk_buff * (*get_untagged_frame)(struct hsr_frame_info *frame,
 					       struct hsr_port *port);
 	struct sk_buff * (*create_tagged_frame)(struct hsr_frame_info *frame,
 						struct hsr_port *port);
 	int (*fill_frame_info)(__be16 proto, struct sk_buff *skb,
 			       struct hsr_frame_info *frame);
 	bool (*invalid_dan_ingress_frame)(__be16 protocol);
 	void (*update_san_info)(struct hsr_node *node, bool is_sup);
 };

 struct hsr_priv {
 	struct rcu_head		rcu_head;
 	struct list_head	ports;
 	struct list_head	node_db;	/* Known HSR nodes */
 	struct list_head	self_node_db;	/* MACs of slaves */
 	struct timer_list	announce_timer;	/* Supervision frame dispatch */
 	struct timer_list	prune_timer;
 	int announce_count;
 	u16 sequence_nr;
 	u16 sup_sequence_nr;	/* For HSRv1 separate seq_nr for supervision */
 	enum hsr_version prot_version;	/* Indicate if HSRv0, HSRv1 or PRPv1 */
 	spinlock_t seqnr_lock;	/* locking for sequence_nr */
 	spinlock_t list_lock;	/* locking for node list */
 	struct hsr_proto_ops	*proto_ops;
 #define PRP_LAN_ID	0x5     /* 0x1010 for A and 0x1011 for B. Bit 0 is set
 				 * based on SLAVE_A or SLAVE_B
 				 */
 	u8 net_id;		/* for PRP, it occupies most significant 3 bits
 				 * of lan_id
 				 */
 	unsigned char		sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
 				/* Align to u16 boundary to avoid unaligned access
 				 * in ether_addr_equal
 				 */
 #ifdef	CONFIG_DEBUG_FS
 	struct dentry *node_tbl_root;
 #endif
 };

 #define hsr_for_each_port(hsr, port) \
 	list_for_each_entry_rcu((port), &(hsr)->ports, port_list)

 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);

 /* Caller must ensure skb is a valid HSR frame */
 static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
 {
 	struct hsr_ethhdr *hsr_ethhdr;

 	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
 	return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
 }

 static inline struct prp_rct *skb_get_PRP_rct(struct sk_buff *skb)
 {
 	unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN;

 	struct prp_rct *rct = (struct prp_rct *)tail;

 	if (rct->PRP_suffix == htons(ETH_P_PRP))
 		return rct;

 	return NULL;
 }

 /* Assume caller has confirmed this skb is PRP suffixed */
 static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct)
 {
 	return ntohs(rct->sequence_nr);
 }

 static inline u16 get_prp_lan_id(struct prp_rct *rct)
 {
 	return ntohs(rct->lan_id_and_LSDU_size) >> 12;
 }

 /* assume there is a valid rct */
 static inline bool prp_check_lsdu_size(struct sk_buff *skb,
 				       struct prp_rct *rct,
 				       bool is_sup)
 {
 	struct ethhdr *ethhdr;
 	int expected_lsdu_size;

 	if (is_sup) {
 		expected_lsdu_size = HSR_V1_SUP_LSDUSIZE;
 	} else {
 		ethhdr = (struct ethhdr *)skb_mac_header(skb);
 		expected_lsdu_size = skb->len - 14;
 		if (ethhdr->h_proto == htons(ETH_P_8021Q))
 			expected_lsdu_size -= 4;
 	}

 	return (expected_lsdu_size == get_prp_LSDU_size(rct));
 }

 #if IS_ENABLED(CONFIG_DEBUG_FS)
 void hsr_debugfs_rename(struct net_device *dev);
 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev);
 void hsr_debugfs_term(struct hsr_priv *priv);
 void hsr_debugfs_create_root(void);
 void hsr_debugfs_remove_root(void);
 #else
 static inline void hsr_debugfs_rename(struct net_device *dev)
 {
 }
 static inline void hsr_debugfs_init(struct hsr_priv *priv,
 				    struct net_device *hsr_dev)
 {}
 static inline void hsr_debugfs_term(struct hsr_priv *priv)
 {}
 static inline void hsr_debugfs_create_root(void)
 {}
 static inline void hsr_debugfs_remove_root(void)
 {}
 #endif

 #endif /*  __HSR_PRIVATE_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	/* Copyright 2011-2014 Autronica Fire and Security AS
	*
	* Author(s):
	* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
	*
	* include file for HSR and PRP.
	*/

	#ifndef __HSR_PRIVATE_H
	#define __HSR_PRIVATE_H

	#include <linux/netdevice.h>
	#include <linux/list.h>
	#include <linux/if_vlan.h>
	#include <linux/if_hsr.h>

	/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
	* Table 8.
	* All values in milliseconds.
	*/
	#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
	#define HSR_NODE_FORGET_TIME 60000 /* ms */
	#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
	#define HSR_ENTRY_FORGET_TIME 400 /* ms */

	/* By how much may slave1 and slave2 timestamps of latest received frame from
	* each node differ before we notify of communication problem?
	*/
	#define MAX_SLAVE_DIFF 3000 /* ms */
	#define HSR_SEQNR_START (USHRT_MAX - 1024)
	#define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)

	/* How often shall we check for broken ring and remove node entries older than
	* HSR_NODE_FORGET_TIME?
	*/
	#define PRUNE_PERIOD 3000 /* ms */

	#define HSR_TLV_ANNOUNCE 22
	#define HSR_TLV_LIFE_CHECK 23
	/* PRP V1 life check for Duplicate discard */
	#define PRP_TLV_LIFE_CHECK_DD 20
	/* PRP V1 life check for Duplicate Accept */
	#define PRP_TLV_LIFE_CHECK_DA 21

	/* HSR Tag.
	* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
	* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
	* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
	* encapsulated protocol } instead.
	*
	* Field names as defined in the IEC:2010 standard for HSR.
	*/
	struct hsr_tag {
	__be16 path_and_LSDU_size;
	__be16 sequence_nr;
	__be16 encap_proto;
	} __packed;

	#define HSR_HLEN 6

	#define HSR_V1_SUP_LSDUSIZE 52

	/* The helper functions below assumes that 'path' occupies the 4 most
	* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
	* equivalently, the 4 most significant bits of HSR tag byte 14).
	*
	* This is unclear in the IEC specification; its definition of MAC addresses
	* indicates the spec is written with the least significant bit first (to the
	* left). This, however, would mean that the LSDU field would be split in two
	* with the path field in-between, which seems strange. I'm guessing the MAC
	* address definition is in error.
	*/

	static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
	{
	ht->path_and_LSDU_size =
	htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) \| (path << 12));
	}

	static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
	{
	ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
	0xF000) \| (LSDU_size & 0x0FFF));
	}

	struct hsr_ethhdr {
	struct ethhdr ethhdr;
	struct hsr_tag hsr_tag;
	} __packed;

	struct hsr_vlan_ethhdr {
	struct vlan_ethhdr vlanhdr;
	struct hsr_tag hsr_tag;
	} __packed;

	/* HSR/PRP Supervision Frame data types.
	* Field names as defined in the IEC:2010 standard for HSR.
	*/
	struct hsr_sup_tag {
	__be16 path_and_HSR_ver;
	__be16 sequence_nr;
	__u8 HSR_TLV_type;
	__u8 HSR_TLV_length;
	} __packed;

	struct hsr_sup_payload {
	unsigned char macaddress_A[ETH_ALEN];
	} __packed;

	static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
	{
	set_hsr_tag_path((struct hsr_tag *)hst, path);
	}

	static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
	{
	set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
	}

	struct hsrv0_ethhdr_sp {
	struct ethhdr ethhdr;
	struct hsr_sup_tag hsr_sup;
	} __packed;

	struct hsrv1_ethhdr_sp {
	struct ethhdr ethhdr;
	struct hsr_tag hsr;
	struct hsr_sup_tag hsr_sup;
	} __packed;

	enum hsr_port_type {
	HSR_PT_NONE = 0, /* Must be 0, used by framereg */
	HSR_PT_SLAVE_A,
	HSR_PT_SLAVE_B,
	HSR_PT_INTERLINK,
	HSR_PT_MASTER,
	HSR_PT_PORTS, /* This must be the last item in the enum */
	};

	/* PRP Redunancy Control Trailor (RCT).
	* As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
	* Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
	*
	* Field names as defined in the IEC:2012 standard for PRP.
	*/
	struct prp_rct {
	__be16 sequence_nr;
	__be16 lan_id_and_LSDU_size;
	__be16 PRP_suffix;
	} __packed;

	static inline u16 get_prp_LSDU_size(struct prp_rct *rct)
	{
	return ntohs(rct->lan_id_and_LSDU_size) & 0x0FFF;
	}

	static inline void set_prp_lan_id(struct prp_rct *rct, u16 lan_id)
	{
	rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
	0x0FFF) \| (lan_id << 12));
	}
	static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
	{
	rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
	0xF000) \| (LSDU_size & 0x0FFF));
	}

	struct hsr_port {
	struct list_head port_list;
	struct net_device *dev;
	struct hsr_priv *hsr;
	enum hsr_port_type type;
	};

	struct hsr_frame_info;
	struct hsr_node;

	struct hsr_proto_ops {
	/* format and send supervision frame */
	void (send_sv_frame)(struct hsr_port port, unsigned long *interval);
	void (*handle_san_frame)(bool san, enum hsr_port_type port,
	struct hsr_node *node);
	bool (drop_frame)(struct hsr_frame_info frame, struct hsr_port *port);
	struct sk_buff * (get_untagged_frame)(struct hsr_frame_info frame,
	struct hsr_port *port);
	struct sk_buff * (create_tagged_frame)(struct hsr_frame_info frame,
	struct hsr_port *port);
	int (fill_frame_info)(__be16 proto, struct sk_buff skb,
	struct hsr_frame_info *frame);
	bool (*invalid_dan_ingress_frame)(__be16 protocol);
	void (update_san_info)(struct hsr_node node, bool is_sup);
	};

	struct hsr_priv {
	struct rcu_head rcu_head;
	struct list_head ports;
	struct list_head node_db; /* Known HSR nodes */
	struct list_head self_node_db; /* MACs of slaves */
	struct timer_list announce_timer; /* Supervision frame dispatch */
	struct timer_list prune_timer;
	int announce_count;
	u16 sequence_nr;
	u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
	enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
	spinlock_t seqnr_lock; /* locking for sequence_nr */
	spinlock_t list_lock; /* locking for node list */
	struct hsr_proto_ops *proto_ops;
	#define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set
	* based on SLAVE_A or SLAVE_B
	*/
	u8 net_id; /* for PRP, it occupies most significant 3 bits
	* of lan_id
	*/
	unsigned char sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
	/* Align to u16 boundary to avoid unaligned access
	* in ether_addr_equal
	*/
	#ifdef CONFIG_DEBUG_FS
	struct dentry *node_tbl_root;
	#endif
	};

	#define hsr_for_each_port(hsr, port) \
	list_for_each_entry_rcu((port), &(hsr)->ports, port_list)

	struct hsr_port hsr_port_get_hsr(struct hsr_priv hsr, enum hsr_port_type pt);

	/* Caller must ensure skb is a valid HSR frame */
	static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
	{
	struct hsr_ethhdr *hsr_ethhdr;

	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
	return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
	}

	static inline struct prp_rct skb_get_PRP_rct(struct sk_buff skb)
	{
	unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN;

	struct prp_rct rct = (struct prp_rct )tail;

	if (rct->PRP_suffix == htons(ETH_P_PRP))
	return rct;

	return NULL;
	}

	/* Assume caller has confirmed this skb is PRP suffixed */
	static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct)
	{
	return ntohs(rct->sequence_nr);
	}

	static inline u16 get_prp_lan_id(struct prp_rct *rct)
	{
	return ntohs(rct->lan_id_and_LSDU_size) >> 12;
	}

	/* assume there is a valid rct */
	static inline bool prp_check_lsdu_size(struct sk_buff *skb,
	struct prp_rct *rct,
	bool is_sup)
	{
	struct ethhdr *ethhdr;
	int expected_lsdu_size;

	if (is_sup) {
	expected_lsdu_size = HSR_V1_SUP_LSDUSIZE;
	} else {
	ethhdr = (struct ethhdr *)skb_mac_header(skb);
	expected_lsdu_size = skb->len - 14;
	if (ethhdr->h_proto == htons(ETH_P_8021Q))
	expected_lsdu_size -= 4;
	}

	return (expected_lsdu_size == get_prp_LSDU_size(rct));
	}

	#if IS_ENABLED(CONFIG_DEBUG_FS)
	void hsr_debugfs_rename(struct net_device *dev);
	void hsr_debugfs_init(struct hsr_priv priv, struct net_device hsr_dev);
	void hsr_debugfs_term(struct hsr_priv *priv);
	void hsr_debugfs_create_root(void);
	void hsr_debugfs_remove_root(void);
	#else
	static inline void hsr_debugfs_rename(struct net_device *dev)
	{
	}
	static inline void hsr_debugfs_init(struct hsr_priv *priv,
	struct net_device *hsr_dev)
	{}
	static inline void hsr_debugfs_term(struct hsr_priv *priv)
	{}
	static inline void hsr_debugfs_create_root(void)
	{}
	static inline void hsr_debugfs_remove_root(void)
	{}
	#endif

	#endif /* __HSR_PRIVATE_H */