linux/net/can/j1939/address-claim.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2010-2011 EIA Electronics,
//                         Kurt Van Dijck <[email protected]>
// Copyright (c) 2010-2011 EIA Electronics,
//                         Pieter Beyens <[email protected]>
// Copyright (c) 2017-2019 Pengutronix,
//                         Marc Kleine-Budde <[email protected]>
// Copyright (c) 2017-2019 Pengutronix,
//                         Oleksij Rempel <[email protected]>

/* J1939 Address Claiming.
 * Address Claiming in the kernel
 * - keeps track of the AC states of ECU's,
 * - resolves NAME<=>SA taking into account the AC states of ECU's.
 *
 * All Address Claim msgs (including host-originated msg) are processed
 * at the receive path (a sent msg is always received again via CAN echo).
 * As such, the processing of AC msgs is done in the order on which msgs
 * are sent on the bus.
 *
 * This module doesn't send msgs itself (e.g. replies on Address Claims),
 * this is the responsibility of a user space application or daemon.
 */

#define pr_fmt(fmt) …

#include <linux/netdevice.h>
#include <linux/skbuff.h>

#include "j1939-priv.h"

static inline name_t j1939_skb_to_name(const struct sk_buff *skb)
{ … }

static inline bool j1939_ac_msg_is_request(struct sk_buff *skb)
{ … }

static int j1939_ac_verify_outgoing(struct j1939_priv *priv,
				    struct sk_buff *skb)
{ … }

int j1939_ac_fixup(struct j1939_priv *priv, struct sk_buff *skb)
{ … }

static void j1939_ac_process(struct j1939_priv *priv, struct sk_buff *skb)
{ … }

void j1939_ac_recv(struct j1939_priv *priv, struct sk_buff *skb)
{ … }