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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (c) 2010-2011 EIA Electronics,
// Kurt Van Dijck <>
// Copyright (c) 2017-2019 Pengutronix,
// Marc Kleine-Budde <>
// Copyright (c) 2017-2019 Pengutronix,
// Oleksij Rempel <>
#ifndef _J1939_PRIV_H_
#define _J1939_PRIV_H_
#include <linux/can/j1939.h>
#include <net/sock.h>
/* Timeout to receive the abort signal over loop back. In case CAN
* bus is open, the timeout should be triggered.
#define J1939_XTP_ABORT_TIMEOUT_MS 500
#define J1939_SIMPLE_ECHO_TIMEOUT_MS (10 * 1000)
struct j1939_session;
enum j1939_sk_errqueue_type {
/* j1939 devices */
struct j1939_ecu {
struct list_head list;
name_t name;
u8 addr;
/* indicates that this ecu successfully claimed @sa as its address */
struct hrtimer ac_timer;
struct kref kref;
struct j1939_priv *priv;
/* count users, to help transport protocol decide for interaction */
int nusers;
struct j1939_priv {
struct list_head ecus;
/* local list entry in priv
* These allow irq (& softirq) context lookups on j1939 devices
* This approach (separate lists) is done as the other 2 alternatives
* are not easier or even wrong
* 1) using the pure kobject methods involves mutexes, which are not
* allowed in irq context.
* 2) duplicating data structures would require a lot of synchronization
* code
* usage:
/* segments need a lock to protect the above list */
rwlock_t lock;
struct net_device *ndev;
/* list of 256 ecu ptrs, that cache the claimed addresses.
* also protected by the above lock
struct j1939_addr_ent {
struct j1939_ecu *ecu;
/* count users, to help transport protocol */
int nusers;
} ents[256];
struct kref kref;
/* List of active sessions to prevent start of conflicting
* one.
* Do not start two sessions of same type, addresses and
* direction.
struct list_head active_session_list;
/* protects active_session_list */
spinlock_t active_session_list_lock;
unsigned int tp_max_packet_size;
/* lock for j1939_socks list */
spinlock_t j1939_socks_lock;
struct list_head j1939_socks;
struct kref rx_kref;
u32 rx_tskey;
void j1939_ecu_put(struct j1939_ecu *ecu);
/* keep the cache of what is local */
int j1939_local_ecu_get(struct j1939_priv *priv, name_t name, u8 sa);
void j1939_local_ecu_put(struct j1939_priv *priv, name_t name, u8 sa);
static inline bool j1939_address_is_unicast(u8 addr)
return addr <= J1939_MAX_UNICAST_ADDR;
static inline bool j1939_address_is_idle(u8 addr)
return addr == J1939_IDLE_ADDR;
static inline bool j1939_address_is_valid(u8 addr)
return addr != J1939_NO_ADDR;
static inline bool j1939_pgn_is_pdu1(pgn_t pgn)
/* ignore dp & res bits for this */
return (pgn & 0xff00) < 0xf000;
/* utility to correctly unmap an ECU */
void j1939_ecu_unmap_locked(struct j1939_ecu *ecu);
void j1939_ecu_unmap(struct j1939_ecu *ecu);
u8 j1939_name_to_addr(struct j1939_priv *priv, name_t name);
struct j1939_ecu *j1939_ecu_find_by_addr_locked(struct j1939_priv *priv,
u8 addr);
struct j1939_ecu *j1939_ecu_get_by_addr(struct j1939_priv *priv, u8 addr);
struct j1939_ecu *j1939_ecu_get_by_addr_locked(struct j1939_priv *priv,
u8 addr);
struct j1939_ecu *j1939_ecu_get_by_name(struct j1939_priv *priv, name_t name);
struct j1939_ecu *j1939_ecu_get_by_name_locked(struct j1939_priv *priv,
name_t name);
enum j1939_transfer_type {
struct j1939_addr {
name_t src_name;
name_t dst_name;
pgn_t pgn;
u8 sa;
u8 da;
u8 type;
/* control buffer of the sk_buff */
struct j1939_sk_buff_cb {
/* Offset in bytes within one ETP session */
u32 offset;
/* for tx, MSG_SYN will be used to sync on sockets */
u32 msg_flags;
u32 tskey;
struct j1939_addr addr;
/* Flags for quick lookups during skb processing.
* These are set in the receive path only.
#define J1939_ECU_LOCAL_SRC BIT(0)
#define J1939_ECU_LOCAL_DST BIT(1)
u8 flags;
priority_t priority;
static inline
struct j1939_sk_buff_cb *j1939_skb_to_cb(const struct sk_buff *skb)
BUILD_BUG_ON(sizeof(struct j1939_sk_buff_cb) > sizeof(skb->cb));
return (struct j1939_sk_buff_cb *)skb->cb;
int j1939_send_one(struct j1939_priv *priv, struct sk_buff *skb);
void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb);
bool j1939_sk_recv_match(struct j1939_priv *priv,
struct j1939_sk_buff_cb *skcb);
void j1939_sk_send_loop_abort(struct sock *sk, int err);
void j1939_sk_errqueue(struct j1939_session *session,
enum j1939_sk_errqueue_type type);
void j1939_sk_queue_activate_next(struct j1939_session *session);
/* stack entries */
struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
struct sk_buff *skb, size_t size);
int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb);
int j1939_ac_fixup(struct j1939_priv *priv, struct sk_buff *skb);
void j1939_ac_recv(struct j1939_priv *priv, struct sk_buff *skb);
void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb);
/* network management */
struct j1939_ecu *j1939_ecu_create_locked(struct j1939_priv *priv, name_t name);
void j1939_ecu_timer_start(struct j1939_ecu *ecu);
void j1939_ecu_timer_cancel(struct j1939_ecu *ecu);
void j1939_ecu_unmap_all(struct j1939_priv *priv);
struct j1939_priv *j1939_netdev_start(struct net_device *ndev);
void j1939_netdev_stop(struct j1939_priv *priv);
void j1939_priv_put(struct j1939_priv *priv);
void j1939_priv_get(struct j1939_priv *priv);
/* notify/alert all j1939 sockets bound to ifindex */
void j1939_sk_netdev_event_netdown(struct j1939_priv *priv);
int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk);
void j1939_tp_init(struct j1939_priv *priv);
/* decrement pending skb for a j1939 socket */
void j1939_sock_pending_del(struct sock *sk);
enum j1939_session_state {
/* waiting for abort signal on the bus */
struct j1939_session {
struct j1939_priv *priv;
struct list_head active_session_list_entry;
struct list_head sk_session_queue_entry;
struct kref kref;
struct sock *sk;
/* ifindex, src, dst, pgn define the session block
* the are _never_ modified after insertion in the list
* this decreases locking problems a _lot_
struct j1939_sk_buff_cb skcb;
struct sk_buff_head skb_queue;
/* all tx related stuff (last_txcmd, pkt.tx)
* is protected (modified only) with the txtimer hrtimer
* 'total' & 'block' are never changed,
* last_cmd, last & block are protected by ->lock
* this means that the tx may run after cts is received that should
* have stopped tx, but this time discrepancy is never avoided anyhow
u8 last_cmd, last_txcmd;
bool transmission;
bool extd;
/* Total message size, number of bytes */
unsigned int total_message_size;
/* Total number of bytes queue from socket to the session */
unsigned int total_queued_size;
unsigned int tx_retry;
int err;
u32 tskey;
enum j1939_session_state state;
/* Packets counters for a (extended) transfer session. The packet is
* maximal of 7 bytes.
struct {
/* total - total number of packets for this session */
unsigned int total;
/* last - last packet of a transfer block after which
* responder should send ETP.CM_CTS and originator
unsigned int last;
/* tx - number of packets send by originator node.
* this counter can be set back if responder node
* didn't received all packets send by originator.
unsigned int tx;
unsigned int tx_acked;
/* rx - number of packets received */
unsigned int rx;
/* block - amount of packets expected in one block */
unsigned int block;
/* dpo - ETP.CM_DPO, Data Packet Offset */
unsigned int dpo;
} pkt;
struct hrtimer txtimer, rxtimer;
struct j1939_sock {
struct sock sk; /* must be first to skip with memset */
struct j1939_priv *priv;
struct list_head list;
#define J1939_SOCK_BOUND BIT(0)
#define J1939_SOCK_CONNECTED BIT(1)
#define J1939_SOCK_PROMISC BIT(2)
#define J1939_SOCK_ERRQUEUE BIT(3)
int state;
int ifindex;
struct j1939_addr addr;
struct j1939_filter *filters;
int nfilters;
pgn_t pgn_rx_filter;
/* j1939 may emit equal PGN (!= equal CAN-id's) out of order
* when transport protocol comes in.
* To allow emitting in order, keep a 'pending' nr. of packets
atomic_t skb_pending;
wait_queue_head_t waitq;
/* lock for the sk_session_queue list */
spinlock_t sk_session_queue_lock;
struct list_head sk_session_queue;
static inline struct j1939_sock *j1939_sk(const struct sock *sk)
return container_of(sk, struct j1939_sock, sk);
void j1939_session_get(struct j1939_session *session);
void j1939_session_put(struct j1939_session *session);
void j1939_session_skb_queue(struct j1939_session *session,
struct sk_buff *skb);
int j1939_session_activate(struct j1939_session *session);
void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec);
void j1939_session_timers_cancel(struct j1939_session *session);
#define J1939_MIN_TP_PACKET_SIZE 9
#define J1939_MAX_TP_PACKET_SIZE (7 * 0xff)
#define J1939_MAX_ETP_PACKET_SIZE (7 * 0x00ffffff)
#define J1939_REGULAR 0
#define J1939_EXTENDED 1
/* CAN protocol */
extern const struct can_proto j1939_can_proto;
#endif /* _J1939_PRIV_H_ */