344 lines
9.4 KiB
C
344 lines
9.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (c) 2010-2011 EIA Electronics,
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// Kurt Van Dijck <kurt.van.dijck@eia.be>
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// Copyright (c) 2017-2019 Pengutronix,
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// Marc Kleine-Budde <kernel@pengutronix.de>
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// Copyright (c) 2017-2019 Pengutronix,
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// Oleksij Rempel <kernel@pengutronix.de>
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#ifndef _J1939_PRIV_H_
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#define _J1939_PRIV_H_
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#include <linux/can/j1939.h>
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#include <net/sock.h>
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/* Timeout to receive the abort signal over loop back. In case CAN
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* bus is open, the timeout should be triggered.
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*/
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#define J1939_XTP_ABORT_TIMEOUT_MS 500
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#define J1939_SIMPLE_ECHO_TIMEOUT_MS (10 * 1000)
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struct j1939_session;
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enum j1939_sk_errqueue_type {
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J1939_ERRQUEUE_TX_ACK,
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J1939_ERRQUEUE_TX_SCHED,
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J1939_ERRQUEUE_TX_ABORT,
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J1939_ERRQUEUE_RX_RTS,
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J1939_ERRQUEUE_RX_DPO,
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J1939_ERRQUEUE_RX_ABORT,
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};
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/* j1939 devices */
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struct j1939_ecu {
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struct list_head list;
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name_t name;
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u8 addr;
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/* indicates that this ecu successfully claimed @sa as its address */
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struct hrtimer ac_timer;
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struct kref kref;
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struct j1939_priv *priv;
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/* count users, to help transport protocol decide for interaction */
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int nusers;
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};
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struct j1939_priv {
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struct list_head ecus;
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/* local list entry in priv
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* These allow irq (& softirq) context lookups on j1939 devices
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* This approach (separate lists) is done as the other 2 alternatives
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* are not easier or even wrong
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* 1) using the pure kobject methods involves mutexes, which are not
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* allowed in irq context.
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* 2) duplicating data structures would require a lot of synchronization
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* code
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* usage:
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*/
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/* segments need a lock to protect the above list */
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rwlock_t lock;
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struct net_device *ndev;
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/* list of 256 ecu ptrs, that cache the claimed addresses.
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* also protected by the above lock
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*/
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struct j1939_addr_ent {
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struct j1939_ecu *ecu;
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/* count users, to help transport protocol */
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int nusers;
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} ents[256];
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struct kref kref;
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/* List of active sessions to prevent start of conflicting
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* one.
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*
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* Do not start two sessions of same type, addresses and
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* direction.
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*/
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struct list_head active_session_list;
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/* protects active_session_list */
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spinlock_t active_session_list_lock;
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unsigned int tp_max_packet_size;
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/* lock for j1939_socks list */
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spinlock_t j1939_socks_lock;
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struct list_head j1939_socks;
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struct kref rx_kref;
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u32 rx_tskey;
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};
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void j1939_ecu_put(struct j1939_ecu *ecu);
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/* keep the cache of what is local */
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int j1939_local_ecu_get(struct j1939_priv *priv, name_t name, u8 sa);
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void j1939_local_ecu_put(struct j1939_priv *priv, name_t name, u8 sa);
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static inline bool j1939_address_is_unicast(u8 addr)
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{
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return addr <= J1939_MAX_UNICAST_ADDR;
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}
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static inline bool j1939_address_is_idle(u8 addr)
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{
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return addr == J1939_IDLE_ADDR;
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}
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static inline bool j1939_address_is_valid(u8 addr)
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{
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return addr != J1939_NO_ADDR;
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}
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static inline bool j1939_pgn_is_pdu1(pgn_t pgn)
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{
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/* ignore dp & res bits for this */
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return (pgn & 0xff00) < 0xf000;
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}
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/* utility to correctly unmap an ECU */
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void j1939_ecu_unmap_locked(struct j1939_ecu *ecu);
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void j1939_ecu_unmap(struct j1939_ecu *ecu);
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u8 j1939_name_to_addr(struct j1939_priv *priv, name_t name);
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struct j1939_ecu *j1939_ecu_find_by_addr_locked(struct j1939_priv *priv,
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u8 addr);
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struct j1939_ecu *j1939_ecu_get_by_addr(struct j1939_priv *priv, u8 addr);
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struct j1939_ecu *j1939_ecu_get_by_addr_locked(struct j1939_priv *priv,
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u8 addr);
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struct j1939_ecu *j1939_ecu_get_by_name(struct j1939_priv *priv, name_t name);
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struct j1939_ecu *j1939_ecu_get_by_name_locked(struct j1939_priv *priv,
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name_t name);
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enum j1939_transfer_type {
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J1939_TP,
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J1939_ETP,
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J1939_SIMPLE,
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};
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struct j1939_addr {
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name_t src_name;
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name_t dst_name;
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pgn_t pgn;
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u8 sa;
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u8 da;
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u8 type;
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};
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/* control buffer of the sk_buff */
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struct j1939_sk_buff_cb {
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/* Offset in bytes within one ETP session */
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u32 offset;
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/* for tx, MSG_SYN will be used to sync on sockets */
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u32 msg_flags;
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u32 tskey;
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struct j1939_addr addr;
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/* Flags for quick lookups during skb processing.
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* These are set in the receive path only.
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*/
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#define J1939_ECU_LOCAL_SRC BIT(0)
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#define J1939_ECU_LOCAL_DST BIT(1)
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u8 flags;
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priority_t priority;
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};
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static inline
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struct j1939_sk_buff_cb *j1939_skb_to_cb(const struct sk_buff *skb)
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{
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BUILD_BUG_ON(sizeof(struct j1939_sk_buff_cb) > sizeof(skb->cb));
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return (struct j1939_sk_buff_cb *)skb->cb;
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}
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int j1939_send_one(struct j1939_priv *priv, struct sk_buff *skb);
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void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb);
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bool j1939_sk_recv_match(struct j1939_priv *priv,
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struct j1939_sk_buff_cb *skcb);
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void j1939_sk_send_loop_abort(struct sock *sk, int err);
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void j1939_sk_errqueue(struct j1939_session *session,
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enum j1939_sk_errqueue_type type);
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void j1939_sk_queue_activate_next(struct j1939_session *session);
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/* stack entries */
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struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
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struct sk_buff *skb, size_t size);
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int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb);
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int j1939_ac_fixup(struct j1939_priv *priv, struct sk_buff *skb);
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void j1939_ac_recv(struct j1939_priv *priv, struct sk_buff *skb);
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void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb);
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/* network management */
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struct j1939_ecu *j1939_ecu_create_locked(struct j1939_priv *priv, name_t name);
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void j1939_ecu_timer_start(struct j1939_ecu *ecu);
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void j1939_ecu_timer_cancel(struct j1939_ecu *ecu);
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void j1939_ecu_unmap_all(struct j1939_priv *priv);
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struct j1939_priv *j1939_netdev_start(struct net_device *ndev);
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void j1939_netdev_stop(struct j1939_priv *priv);
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void j1939_priv_put(struct j1939_priv *priv);
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void j1939_priv_get(struct j1939_priv *priv);
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/* notify/alert all j1939 sockets bound to ifindex */
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void j1939_sk_netdev_event_netdown(struct j1939_priv *priv);
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int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk);
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void j1939_tp_init(struct j1939_priv *priv);
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/* decrement pending skb for a j1939 socket */
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void j1939_sock_pending_del(struct sock *sk);
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enum j1939_session_state {
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J1939_SESSION_NEW,
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J1939_SESSION_ACTIVE,
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/* waiting for abort signal on the bus */
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J1939_SESSION_WAITING_ABORT,
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J1939_SESSION_ACTIVE_MAX,
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J1939_SESSION_DONE,
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};
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struct j1939_session {
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struct j1939_priv *priv;
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struct list_head active_session_list_entry;
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struct list_head sk_session_queue_entry;
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struct kref kref;
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struct sock *sk;
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/* ifindex, src, dst, pgn define the session block
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* the are _never_ modified after insertion in the list
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* this decreases locking problems a _lot_
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*/
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struct j1939_sk_buff_cb skcb;
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struct sk_buff_head skb_queue;
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/* all tx related stuff (last_txcmd, pkt.tx)
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* is protected (modified only) with the txtimer hrtimer
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* 'total' & 'block' are never changed,
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* last_cmd, last & block are protected by ->lock
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* this means that the tx may run after cts is received that should
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* have stopped tx, but this time discrepancy is never avoided anyhow
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*/
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u8 last_cmd, last_txcmd;
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bool transmission;
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bool extd;
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/* Total message size, number of bytes */
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unsigned int total_message_size;
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/* Total number of bytes queue from socket to the session */
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unsigned int total_queued_size;
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unsigned int tx_retry;
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int err;
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u32 tskey;
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enum j1939_session_state state;
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/* Packets counters for a (extended) transfer session. The packet is
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* maximal of 7 bytes.
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*/
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struct {
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/* total - total number of packets for this session */
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unsigned int total;
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/* last - last packet of a transfer block after which
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* responder should send ETP.CM_CTS and originator
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* ETP.CM_DPO
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*/
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unsigned int last;
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/* tx - number of packets send by originator node.
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* this counter can be set back if responder node
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* didn't received all packets send by originator.
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*/
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unsigned int tx;
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unsigned int tx_acked;
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/* rx - number of packets received */
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unsigned int rx;
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/* block - amount of packets expected in one block */
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unsigned int block;
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/* dpo - ETP.CM_DPO, Data Packet Offset */
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unsigned int dpo;
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} pkt;
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struct hrtimer txtimer, rxtimer;
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};
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struct j1939_sock {
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struct sock sk; /* must be first to skip with memset */
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struct j1939_priv *priv;
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struct list_head list;
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#define J1939_SOCK_BOUND BIT(0)
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#define J1939_SOCK_CONNECTED BIT(1)
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#define J1939_SOCK_PROMISC BIT(2)
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#define J1939_SOCK_ERRQUEUE BIT(3)
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int state;
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int ifindex;
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struct j1939_addr addr;
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struct j1939_filter *filters;
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int nfilters;
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pgn_t pgn_rx_filter;
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/* j1939 may emit equal PGN (!= equal CAN-id's) out of order
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* when transport protocol comes in.
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* To allow emitting in order, keep a 'pending' nr. of packets
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*/
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atomic_t skb_pending;
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wait_queue_head_t waitq;
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/* lock for the sk_session_queue list */
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spinlock_t sk_session_queue_lock;
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struct list_head sk_session_queue;
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};
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static inline struct j1939_sock *j1939_sk(const struct sock *sk)
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{
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return container_of(sk, struct j1939_sock, sk);
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}
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void j1939_session_get(struct j1939_session *session);
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void j1939_session_put(struct j1939_session *session);
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void j1939_session_skb_queue(struct j1939_session *session,
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struct sk_buff *skb);
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int j1939_session_activate(struct j1939_session *session);
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void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec);
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void j1939_session_timers_cancel(struct j1939_session *session);
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#define J1939_MIN_TP_PACKET_SIZE 9
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#define J1939_MAX_TP_PACKET_SIZE (7 * 0xff)
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#define J1939_MAX_ETP_PACKET_SIZE (7 * 0x00ffffff)
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#define J1939_REGULAR 0
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#define J1939_EXTENDED 1
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/* CAN protocol */
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extern const struct can_proto j1939_can_proto;
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#endif /* _J1939_PRIV_H_ */
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