303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*
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* include file for HSR and PRP.
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*/
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#ifndef __HSR_PRIVATE_H
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#define __HSR_PRIVATE_H
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#include <linux/netdevice.h>
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#include <linux/list.h>
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#include <linux/if_vlan.h>
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#include <linux/if_hsr.h>
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/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
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* Table 8.
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* All values in milliseconds.
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*/
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#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
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#define HSR_NODE_FORGET_TIME 60000 /* ms */
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#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
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#define HSR_ENTRY_FORGET_TIME 400 /* ms */
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/* By how much may slave1 and slave2 timestamps of latest received frame from
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* each node differ before we notify of communication problem?
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*/
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#define MAX_SLAVE_DIFF 3000 /* ms */
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#define HSR_SEQNR_START (USHRT_MAX - 1024)
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#define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)
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/* How often shall we check for broken ring and remove node entries older than
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* HSR_NODE_FORGET_TIME?
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*/
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#define PRUNE_PERIOD 3000 /* ms */
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#define HSR_TLV_ANNOUNCE 22
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#define HSR_TLV_LIFE_CHECK 23
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/* PRP V1 life check for Duplicate discard */
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#define PRP_TLV_LIFE_CHECK_DD 20
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/* PRP V1 life check for Duplicate Accept */
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#define PRP_TLV_LIFE_CHECK_DA 21
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/* HSR Tag.
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* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
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* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
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* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
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* encapsulated protocol } instead.
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*
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_tag {
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__be16 path_and_LSDU_size;
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__be16 sequence_nr;
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__be16 encap_proto;
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} __packed;
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#define HSR_HLEN 6
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#define HSR_V1_SUP_LSDUSIZE 52
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/* The helper functions below assumes that 'path' occupies the 4 most
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* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
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* equivalently, the 4 most significant bits of HSR tag byte 14).
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*
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* This is unclear in the IEC specification; its definition of MAC addresses
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* indicates the spec is written with the least significant bit first (to the
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* left). This, however, would mean that the LSDU field would be split in two
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* with the path field in-between, which seems strange. I'm guessing the MAC
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* address definition is in error.
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*/
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static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
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{
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ht->path_and_LSDU_size =
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htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
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}
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static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
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{
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ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
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0xF000) | (LSDU_size & 0x0FFF));
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}
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struct hsr_ethhdr {
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struct ethhdr ethhdr;
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struct hsr_tag hsr_tag;
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} __packed;
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struct hsr_vlan_ethhdr {
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struct vlan_ethhdr vlanhdr;
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struct hsr_tag hsr_tag;
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} __packed;
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/* HSR/PRP Supervision Frame data types.
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_sup_tag {
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__be16 path_and_HSR_ver;
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__be16 sequence_nr;
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__u8 HSR_TLV_type;
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__u8 HSR_TLV_length;
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} __packed;
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struct hsr_sup_payload {
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unsigned char macaddress_A[ETH_ALEN];
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} __packed;
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static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
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{
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set_hsr_tag_path((struct hsr_tag *)hst, path);
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}
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static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
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{
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set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
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}
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struct hsrv0_ethhdr_sp {
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struct ethhdr ethhdr;
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struct hsr_sup_tag hsr_sup;
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} __packed;
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struct hsrv1_ethhdr_sp {
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struct ethhdr ethhdr;
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struct hsr_tag hsr;
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struct hsr_sup_tag hsr_sup;
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} __packed;
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enum hsr_port_type {
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HSR_PT_NONE = 0, /* Must be 0, used by framereg */
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HSR_PT_SLAVE_A,
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HSR_PT_SLAVE_B,
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HSR_PT_INTERLINK,
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HSR_PT_MASTER,
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HSR_PT_PORTS, /* This must be the last item in the enum */
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};
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/* PRP Redunancy Control Trailor (RCT).
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* As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
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* Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
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*
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* Field names as defined in the IEC:2012 standard for PRP.
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*/
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struct prp_rct {
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__be16 sequence_nr;
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__be16 lan_id_and_LSDU_size;
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__be16 PRP_suffix;
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} __packed;
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static inline u16 get_prp_LSDU_size(struct prp_rct *rct)
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{
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return ntohs(rct->lan_id_and_LSDU_size) & 0x0FFF;
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}
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static inline void set_prp_lan_id(struct prp_rct *rct, u16 lan_id)
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{
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rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
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0x0FFF) | (lan_id << 12));
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}
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static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
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{
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rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
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0xF000) | (LSDU_size & 0x0FFF));
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}
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struct hsr_port {
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struct list_head port_list;
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struct net_device *dev;
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struct hsr_priv *hsr;
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enum hsr_port_type type;
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};
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struct hsr_frame_info;
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struct hsr_node;
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struct hsr_proto_ops {
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/* format and send supervision frame */
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void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval);
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void (*handle_san_frame)(bool san, enum hsr_port_type port,
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struct hsr_node *node);
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bool (*drop_frame)(struct hsr_frame_info *frame, struct hsr_port *port);
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struct sk_buff * (*get_untagged_frame)(struct hsr_frame_info *frame,
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struct hsr_port *port);
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struct sk_buff * (*create_tagged_frame)(struct hsr_frame_info *frame,
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struct hsr_port *port);
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int (*fill_frame_info)(__be16 proto, struct sk_buff *skb,
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struct hsr_frame_info *frame);
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bool (*invalid_dan_ingress_frame)(__be16 protocol);
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void (*update_san_info)(struct hsr_node *node, bool is_sup);
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};
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struct hsr_priv {
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struct rcu_head rcu_head;
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struct list_head ports;
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struct list_head node_db; /* Known HSR nodes */
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struct list_head self_node_db; /* MACs of slaves */
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struct timer_list announce_timer; /* Supervision frame dispatch */
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struct timer_list prune_timer;
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int announce_count;
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u16 sequence_nr;
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u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
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enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
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spinlock_t seqnr_lock; /* locking for sequence_nr */
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spinlock_t list_lock; /* locking for node list */
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struct hsr_proto_ops *proto_ops;
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#define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set
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* based on SLAVE_A or SLAVE_B
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*/
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u8 net_id; /* for PRP, it occupies most significant 3 bits
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* of lan_id
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*/
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unsigned char sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
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/* Align to u16 boundary to avoid unaligned access
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* in ether_addr_equal
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*/
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#ifdef CONFIG_DEBUG_FS
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struct dentry *node_tbl_root;
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#endif
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};
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#define hsr_for_each_port(hsr, port) \
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list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
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struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
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/* Caller must ensure skb is a valid HSR frame */
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static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
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return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
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}
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static inline struct prp_rct *skb_get_PRP_rct(struct sk_buff *skb)
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{
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unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN;
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struct prp_rct *rct = (struct prp_rct *)tail;
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if (rct->PRP_suffix == htons(ETH_P_PRP))
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return rct;
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return NULL;
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}
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/* Assume caller has confirmed this skb is PRP suffixed */
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static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct)
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{
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return ntohs(rct->sequence_nr);
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}
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static inline u16 get_prp_lan_id(struct prp_rct *rct)
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{
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return ntohs(rct->lan_id_and_LSDU_size) >> 12;
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}
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/* assume there is a valid rct */
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static inline bool prp_check_lsdu_size(struct sk_buff *skb,
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struct prp_rct *rct,
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bool is_sup)
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{
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struct ethhdr *ethhdr;
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int expected_lsdu_size;
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if (is_sup) {
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expected_lsdu_size = HSR_V1_SUP_LSDUSIZE;
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} else {
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ethhdr = (struct ethhdr *)skb_mac_header(skb);
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expected_lsdu_size = skb->len - 14;
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if (ethhdr->h_proto == htons(ETH_P_8021Q))
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expected_lsdu_size -= 4;
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}
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return (expected_lsdu_size == get_prp_LSDU_size(rct));
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}
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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void hsr_debugfs_rename(struct net_device *dev);
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void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev);
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void hsr_debugfs_term(struct hsr_priv *priv);
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void hsr_debugfs_create_root(void);
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void hsr_debugfs_remove_root(void);
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#else
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static inline void hsr_debugfs_rename(struct net_device *dev)
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{
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}
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static inline void hsr_debugfs_init(struct hsr_priv *priv,
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struct net_device *hsr_dev)
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{}
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static inline void hsr_debugfs_term(struct hsr_priv *priv)
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{}
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static inline void hsr_debugfs_create_root(void)
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{}
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static inline void hsr_debugfs_remove_root(void)
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{}
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#endif
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#endif /* __HSR_PRIVATE_H */
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