Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2206 insertions, 0 deletions

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
new file mode 100644
index 000000000..bd8ec2433
--- /dev/null
+++ b/net/can/j1939/transport.c
@@ -0,0 +1,2206 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2010-2011 EIA Electronics,
+//                         Kurt Van Dijck <kurt.van.dijck@eia.be>
+// Copyright (c) 2018 Protonic,
+//                         Robin van der Gracht <robin@protonic.nl>
+// Copyright (c) 2017-2019 Pengutronix,
+//                         Marc Kleine-Budde <kernel@pengutronix.de>
+// Copyright (c) 2017-2019 Pengutronix,
+//                         Oleksij Rempel <kernel@pengutronix.de>
+
+#include <linux/can/skb.h>
+
+#include "j1939-priv.h"
+
+#define J1939_XTP_TX_RETRY_LIMIT 100
+
+#define J1939_ETP_PGN_CTL 0xc800
+#define J1939_ETP_PGN_DAT 0xc700
+#define J1939_TP_PGN_CTL 0xec00
+#define J1939_TP_PGN_DAT 0xeb00
+
+#define J1939_TP_CMD_RTS 0x10
+#define J1939_TP_CMD_CTS 0x11
+#define J1939_TP_CMD_EOMA 0x13
+#define J1939_TP_CMD_BAM 0x20
+#define J1939_TP_CMD_ABORT 0xff
+
+#define J1939_ETP_CMD_RTS 0x14
+#define J1939_ETP_CMD_CTS 0x15
+#define J1939_ETP_CMD_DPO 0x16
+#define J1939_ETP_CMD_EOMA 0x17
+#define J1939_ETP_CMD_ABORT 0xff
+
+enum j1939_xtp_abort {
+	J1939_XTP_NO_ABORT = 0,
+	J1939_XTP_ABORT_BUSY = 1,
+	/* Already in one or more connection managed sessions and
+	 * cannot support another.
+	 *
+	 * EALREADY:
+	 * Operation already in progress
+	 */
+
+	J1939_XTP_ABORT_RESOURCE = 2,
+	/* System resources were needed for another task so this
+	 * connection managed session was terminated.
+	 *
+	 * EMSGSIZE:
+	 * The socket type requires that message be sent atomically,
+	 * and the size of the message to be sent made this
+	 * impossible.
+	 */
+
+	J1939_XTP_ABORT_TIMEOUT = 3,
+	/* A timeout occurred and this is the connection abort to
+	 * close the session.
+	 *
+	 * EHOSTUNREACH:
+	 * The destination host cannot be reached (probably because
+	 * the host is down or a remote router cannot reach it).
+	 */
+
+	J1939_XTP_ABORT_GENERIC = 4,
+	/* CTS messages received when data transfer is in progress
+	 *
+	 * EBADMSG:
+	 * Not a data message
+	 */
+
+	J1939_XTP_ABORT_FAULT = 5,
+	/* Maximal retransmit request limit reached
+	 *
+	 * ENOTRECOVERABLE:
+	 * State not recoverable
+	 */
+
+	J1939_XTP_ABORT_UNEXPECTED_DATA = 6,
+	/* Unexpected data transfer packet
+	 *
+	 * ENOTCONN:
+	 * Transport endpoint is not connected
+	 */
+
+	J1939_XTP_ABORT_BAD_SEQ = 7,
+	/* Bad sequence number (and software is not able to recover)
+	 *
+	 * EILSEQ:
+	 * Illegal byte sequence
+	 */
+
+	J1939_XTP_ABORT_DUP_SEQ = 8,
+	/* Duplicate sequence number (and software is not able to
+	 * recover)
+	 */
+
+	J1939_XTP_ABORT_EDPO_UNEXPECTED = 9,
+	/* Unexpected EDPO packet (ETP) or Message size > 1785 bytes
+	 * (TP)
+	 */
+
+	J1939_XTP_ABORT_BAD_EDPO_PGN = 10,
+	/* Unexpected EDPO PGN (PGN in EDPO is bad) */
+
+	J1939_XTP_ABORT_EDPO_OUTOF_CTS = 11,
+	/* EDPO number of packets is greater than CTS */
+
+	J1939_XTP_ABORT_BAD_EDPO_OFFSET = 12,
+	/* Bad EDPO offset */
+
+	J1939_XTP_ABORT_OTHER_DEPRECATED = 13,
+	/* Deprecated. Use 250 instead (Any other reason)  */
+
+	J1939_XTP_ABORT_ECTS_UNXPECTED_PGN = 14,
+	/* Unexpected ECTS PGN (PGN in ECTS is bad) */
+
+	J1939_XTP_ABORT_ECTS_TOO_BIG = 15,
+	/* ECTS requested packets exceeds message size */
+
+	J1939_XTP_ABORT_OTHER = 250,
+	/* Any other reason (if a Connection Abort reason is
+	 * identified that is not listed in the table use code 250)
+	 */
+};
+
+static unsigned int j1939_tp_block = 255;
+static unsigned int j1939_tp_packet_delay;
+static unsigned int j1939_tp_padding = 1;
+
+/* helpers */
+static const char *j1939_xtp_abort_to_str(enum j1939_xtp_abort abort)
+{
+	switch (abort) {
+	case J1939_XTP_ABORT_BUSY:
+		return "Already in one or more connection managed sessions and cannot support another.";
+	case J1939_XTP_ABORT_RESOURCE:
+		return "System resources were needed for another task so this connection managed session was terminated.";
+	case J1939_XTP_ABORT_TIMEOUT:
+		return "A timeout occurred and this is the connection abort to close the session.";
+	case J1939_XTP_ABORT_GENERIC:
+		return "CTS messages received when data transfer is in progress";
+	case J1939_XTP_ABORT_FAULT:
+		return "Maximal retransmit request limit reached";
+	case J1939_XTP_ABORT_UNEXPECTED_DATA:
+		return "Unexpected data transfer packet";
+	case J1939_XTP_ABORT_BAD_SEQ:
+		return "Bad sequence number (and software is not able to recover)";
+	case J1939_XTP_ABORT_DUP_SEQ:
+		return "Duplicate sequence number (and software is not able to recover)";
+	case J1939_XTP_ABORT_EDPO_UNEXPECTED:
+		return "Unexpected EDPO packet (ETP) or Message size > 1785 bytes (TP)";
+	case J1939_XTP_ABORT_BAD_EDPO_PGN:
+		return "Unexpected EDPO PGN (PGN in EDPO is bad)";
+	case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
+		return "EDPO number of packets is greater than CTS";
+	case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
+		return "Bad EDPO offset";
+	case J1939_XTP_ABORT_OTHER_DEPRECATED:
+		return "Deprecated. Use 250 instead (Any other reason)";
+	case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
+		return "Unexpected ECTS PGN (PGN in ECTS is bad)";
+	case J1939_XTP_ABORT_ECTS_TOO_BIG:
+		return "ECTS requested packets exceeds message size";
+	case J1939_XTP_ABORT_OTHER:
+		return "Any other reason (if a Connection Abort reason is identified that is not listed in the table use code 250)";
+	default:
+		return "<unknown>";
+	}
+}
+
+static int j1939_xtp_abort_to_errno(struct j1939_priv *priv,
+				    enum j1939_xtp_abort abort)
+{
+	int err;
+
+	switch (abort) {
+	case J1939_XTP_NO_ABORT:
+		WARN_ON_ONCE(abort == J1939_XTP_NO_ABORT);
+		err = 0;
+		break;
+	case J1939_XTP_ABORT_BUSY:
+		err = EALREADY;
+		break;
+	case J1939_XTP_ABORT_RESOURCE:
+		err = EMSGSIZE;
+		break;
+	case J1939_XTP_ABORT_TIMEOUT:
+		err = EHOSTUNREACH;
+		break;
+	case J1939_XTP_ABORT_GENERIC:
+		err = EBADMSG;
+		break;
+	case J1939_XTP_ABORT_FAULT:
+		err = ENOTRECOVERABLE;
+		break;
+	case J1939_XTP_ABORT_UNEXPECTED_DATA:
+		err = ENOTCONN;
+		break;
+	case J1939_XTP_ABORT_BAD_SEQ:
+		err = EILSEQ;
+		break;
+	case J1939_XTP_ABORT_DUP_SEQ:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_EDPO_UNEXPECTED:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_BAD_EDPO_PGN:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_OTHER_DEPRECATED:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_ECTS_TOO_BIG:
+		err = EPROTO;
+		break;
+	case J1939_XTP_ABORT_OTHER:
+		err = EPROTO;
+		break;
+	default:
+		netdev_warn(priv->ndev, "Unknown abort code %i", abort);
+		err = EPROTO;
+	}
+
+	return err;
+}
+
+static inline void j1939_session_list_lock(struct j1939_priv *priv)
+{
+	spin_lock_bh(&priv->active_session_list_lock);
+}
+
+static inline void j1939_session_list_unlock(struct j1939_priv *priv)
+{
+	spin_unlock_bh(&priv->active_session_list_lock);
+}
+
+void j1939_session_get(struct j1939_session *session)
+{
+	kref_get(&session->kref);
+}
+
+/* session completion functions */
+static void __j1939_session_drop(struct j1939_session *session)
+{
+	if (!session->transmission)
+		return;
+
+	j1939_sock_pending_del(session->sk);
+	sock_put(session->sk);
+}
+
+static void j1939_session_destroy(struct j1939_session *session)
+{
+	struct sk_buff *skb;
+
+	if (session->transmission) {
+		if (session->err)
+			j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ABORT);
+		else
+			j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ACK);
+	} else if (session->err) {
+			j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
+	}
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
+	WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
+
+	while ((skb = skb_dequeue(&session->skb_queue)) != NULL) {
+		/* drop ref taken in j1939_session_skb_queue() */
+		skb_unref(skb);
+		kfree_skb(skb);
+	}
+	__j1939_session_drop(session);
+	j1939_priv_put(session->priv);
+	kfree(session);
+}
+
+static void __j1939_session_release(struct kref *kref)
+{
+	struct j1939_session *session = container_of(kref, struct j1939_session,
+						     kref);
+
+	j1939_session_destroy(session);
+}
+
+void j1939_session_put(struct j1939_session *session)
+{
+	kref_put(&session->kref, __j1939_session_release);
+}
+
+static void j1939_session_txtimer_cancel(struct j1939_session *session)
+{
+	if (hrtimer_cancel(&session->txtimer))
+		j1939_session_put(session);
+}
+
+static void j1939_session_rxtimer_cancel(struct j1939_session *session)
+{
+	if (hrtimer_cancel(&session->rxtimer))
+		j1939_session_put(session);
+}
+
+void j1939_session_timers_cancel(struct j1939_session *session)
+{
+	j1939_session_txtimer_cancel(session);
+	j1939_session_rxtimer_cancel(session);
+}
+
+static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb)
+{
+	return (!skcb->addr.dst_name && (skcb->addr.da == 0xff));
+}
+
+static void j1939_session_skb_drop_old(struct j1939_session *session)
+{
+	struct sk_buff *do_skb;
+	struct j1939_sk_buff_cb *do_skcb;
+	unsigned int offset_start;
+	unsigned long flags;
+
+	if (skb_queue_len(&session->skb_queue) < 2)
+		return;
+
+	offset_start = session->pkt.tx_acked * 7;
+
+	spin_lock_irqsave(&session->skb_queue.lock, flags);
+	do_skb = skb_peek(&session->skb_queue);
+	do_skcb = j1939_skb_to_cb(do_skb);
+
+	if ((do_skcb->offset + do_skb->len) < offset_start) {
+		__skb_unlink(do_skb, &session->skb_queue);
+		/* drop ref taken in j1939_session_skb_queue() */
+		skb_unref(do_skb);
+		spin_unlock_irqrestore(&session->skb_queue.lock, flags);
+
+		kfree_skb(do_skb);
+	} else {
+		spin_unlock_irqrestore(&session->skb_queue.lock, flags);
+	}
+}
+
+void j1939_session_skb_queue(struct j1939_session *session,
+			     struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_priv *priv = session->priv;
+
+	j1939_ac_fixup(priv, skb);
+
+	if (j1939_address_is_unicast(skcb->addr.da) &&
+	    priv->ents[skcb->addr.da].nusers)
+		skcb->flags |= J1939_ECU_LOCAL_DST;
+
+	skcb->flags |= J1939_ECU_LOCAL_SRC;
+
+	skb_get(skb);
+	skb_queue_tail(&session->skb_queue, skb);
+}
+
+static struct
+sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session,
+					 unsigned int offset_start)
+{
+	struct j1939_priv *priv = session->priv;
+	struct j1939_sk_buff_cb *do_skcb;
+	struct sk_buff *skb = NULL;
+	struct sk_buff *do_skb;
+	unsigned long flags;
+
+	spin_lock_irqsave(&session->skb_queue.lock, flags);
+	skb_queue_walk(&session->skb_queue, do_skb) {
+		do_skcb = j1939_skb_to_cb(do_skb);
+
+		if (offset_start >= do_skcb->offset &&
+		    offset_start < (do_skcb->offset + do_skb->len)) {
+			skb = do_skb;
+		}
+	}
+
+	if (skb)
+		skb_get(skb);
+
+	spin_unlock_irqrestore(&session->skb_queue.lock, flags);
+
+	if (!skb)
+		netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n",
+			   __func__, session, offset_start,
+			   skb_queue_len(&session->skb_queue));
+
+	return skb;
+}
+
+static struct sk_buff *j1939_session_skb_get(struct j1939_session *session)
+{
+	unsigned int offset_start;
+
+	offset_start = session->pkt.dpo * 7;
+	return j1939_session_skb_get_by_offset(session, offset_start);
+}
+
+/* see if we are receiver
+ * returns 0 for broadcasts, although we will receive them
+ */
+static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb)
+{
+	return skcb->flags & J1939_ECU_LOCAL_DST;
+}
+
+/* see if we are sender */
+static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb)
+{
+	return skcb->flags & J1939_ECU_LOCAL_SRC;
+}
+
+/* see if we are involved as either receiver or transmitter */
+static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap)
+{
+	if (swap)
+		return j1939_tp_im_receiver(skcb);
+	else
+		return j1939_tp_im_transmitter(skcb);
+}
+
+static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb)
+{
+	return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
+}
+
+/* extract pgn from flow-ctl message */
+static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat)
+{
+	pgn_t pgn;
+
+	pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0);
+	if (j1939_pgn_is_pdu1(pgn))
+		pgn &= 0xffff00;
+	return pgn;
+}
+
+static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat)
+{
+	return (dat[2] << 8) + (dat[1] << 0);
+}
+
+static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat)
+{
+	return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0);
+}
+
+static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat)
+{
+	return (dat[4] << 24) | (dat[3] << 16) |
+		(dat[2] << 8) | (dat[1] << 0);
+}
+
+/* find existing session:
+ * reverse: swap cb's src & dst
+ * there is no problem with matching broadcasts, since
+ * broadcasts (no dst, no da) would never call this
+ * with reverse == true
+ */
+static bool j1939_session_match(struct j1939_addr *se_addr,
+				struct j1939_addr *sk_addr, bool reverse)
+{
+	if (se_addr->type != sk_addr->type)
+		return false;
+
+	if (reverse) {
+		if (se_addr->src_name) {
+			if (se_addr->src_name != sk_addr->dst_name)
+				return false;
+		} else if (se_addr->sa != sk_addr->da) {
+			return false;
+		}
+
+		if (se_addr->dst_name) {
+			if (se_addr->dst_name != sk_addr->src_name)
+				return false;
+		} else if (se_addr->da != sk_addr->sa) {
+			return false;
+		}
+	} else {
+		if (se_addr->src_name) {
+			if (se_addr->src_name != sk_addr->src_name)
+				return false;
+		} else if (se_addr->sa != sk_addr->sa) {
+			return false;
+		}
+
+		if (se_addr->dst_name) {
+			if (se_addr->dst_name != sk_addr->dst_name)
+				return false;
+		} else if (se_addr->da != sk_addr->da) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static struct
+j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv,
+						struct list_head *root,
+						struct j1939_addr *addr,
+						bool reverse, bool transmitter)
+{
+	struct j1939_session *session;
+
+	lockdep_assert_held(&priv->active_session_list_lock);
+
+	list_for_each_entry(session, root, active_session_list_entry) {
+		j1939_session_get(session);
+		if (j1939_session_match(&session->skcb.addr, addr, reverse) &&
+		    session->transmission == transmitter)
+			return session;
+		j1939_session_put(session);
+	}
+
+	return NULL;
+}
+
+static struct
+j1939_session *j1939_session_get_simple(struct j1939_priv *priv,
+					struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+
+	lockdep_assert_held(&priv->active_session_list_lock);
+
+	list_for_each_entry(session, &priv->active_session_list,
+			    active_session_list_entry) {
+		j1939_session_get(session);
+		if (session->skcb.addr.type == J1939_SIMPLE &&
+		    session->tskey == skcb->tskey && session->sk == skb->sk)
+			return session;
+		j1939_session_put(session);
+	}
+
+	return NULL;
+}
+
+static struct
+j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv,
+					 struct j1939_addr *addr,
+					 bool reverse, bool transmitter)
+{
+	struct j1939_session *session;
+
+	j1939_session_list_lock(priv);
+	session = j1939_session_get_by_addr_locked(priv,
+						   &priv->active_session_list,
+						   addr, reverse, transmitter);
+	j1939_session_list_unlock(priv);
+
+	return session;
+}
+
+static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb)
+{
+	u8 tmp = 0;
+
+	swap(skcb->addr.dst_name, skcb->addr.src_name);
+	swap(skcb->addr.da, skcb->addr.sa);
+
+	/* swap SRC and DST flags, leave other untouched */
+	if (skcb->flags & J1939_ECU_LOCAL_SRC)
+		tmp |= J1939_ECU_LOCAL_DST;
+	if (skcb->flags & J1939_ECU_LOCAL_DST)
+		tmp |= J1939_ECU_LOCAL_SRC;
+	skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
+	skcb->flags |= tmp;
+}
+
+static struct
+sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
+			     const struct j1939_sk_buff_cb *re_skcb,
+			     bool ctl,
+			     bool swap_src_dst)
+{
+	struct sk_buff *skb;
+	struct j1939_sk_buff_cb *skcb;
+
+	skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv),
+			GFP_ATOMIC);
+	if (unlikely(!skb))
+		return ERR_PTR(-ENOMEM);
+
+	skb->dev = priv->ndev;
+	can_skb_reserve(skb);
+	can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
+	can_skb_prv(skb)->skbcnt = 0;
+	/* reserve CAN header */
+	skb_reserve(skb, offsetof(struct can_frame, data));
+
+	/* skb->cb must be large enough to hold a j1939_sk_buff_cb structure */
+	BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*re_skcb));
+
+	memcpy(skb->cb, re_skcb, sizeof(*re_skcb));
+	skcb = j1939_skb_to_cb(skb);
+	if (swap_src_dst)
+		j1939_skbcb_swap(skcb);
+
+	if (ctl) {
+		if (skcb->addr.type == J1939_ETP)
+			skcb->addr.pgn = J1939_ETP_PGN_CTL;
+		else
+			skcb->addr.pgn = J1939_TP_PGN_CTL;
+	} else {
+		if (skcb->addr.type == J1939_ETP)
+			skcb->addr.pgn = J1939_ETP_PGN_DAT;
+		else
+			skcb->addr.pgn = J1939_TP_PGN_DAT;
+	}
+
+	return skb;
+}
+
+/* TP transmit packet functions */
+static int j1939_tp_tx_dat(struct j1939_session *session,
+			   const u8 *dat, int len)
+{
+	struct j1939_priv *priv = session->priv;
+	struct sk_buff *skb;
+
+	skb = j1939_tp_tx_dat_new(priv, &session->skcb,
+				  false, false);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	skb_put_data(skb, dat, len);
+	if (j1939_tp_padding && len < 8)
+		memset(skb_put(skb, 8 - len), 0xff, 8 - len);
+
+	return j1939_send_one(priv, skb);
+}
+
+static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv,
+			       const struct j1939_sk_buff_cb *re_skcb,
+			       bool swap_src_dst, pgn_t pgn, const u8 *dat)
+{
+	struct sk_buff *skb;
+	u8 *skdat;
+
+	if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
+		return 0;
+
+	skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	skdat = skb_put(skb, 8);
+	memcpy(skdat, dat, 5);
+	skdat[5] = (pgn >> 0);
+	skdat[6] = (pgn >> 8);
+	skdat[7] = (pgn >> 16);
+
+	return j1939_send_one(priv, skb);
+}
+
+static inline int j1939_tp_tx_ctl(struct j1939_session *session,
+				  bool swap_src_dst, const u8 *dat)
+{
+	struct j1939_priv *priv = session->priv;
+
+	return j1939_xtp_do_tx_ctl(priv, &session->skcb,
+				   swap_src_dst,
+				   session->skcb.addr.pgn, dat);
+}
+
+static int j1939_xtp_tx_abort(struct j1939_priv *priv,
+			      const struct j1939_sk_buff_cb *re_skcb,
+			      bool swap_src_dst,
+			      enum j1939_xtp_abort err,
+			      pgn_t pgn)
+{
+	u8 dat[5];
+
+	if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
+		return 0;
+
+	memset(dat, 0xff, sizeof(dat));
+	dat[0] = J1939_TP_CMD_ABORT;
+	dat[1] = err;
+	return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat);
+}
+
+void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec)
+{
+	j1939_session_get(session);
+	hrtimer_start(&session->txtimer, ms_to_ktime(msec),
+		      HRTIMER_MODE_REL_SOFT);
+}
+
+static inline void j1939_tp_set_rxtimeout(struct j1939_session *session,
+					  int msec)
+{
+	j1939_session_rxtimer_cancel(session);
+	j1939_session_get(session);
+	hrtimer_start(&session->rxtimer, ms_to_ktime(msec),
+		      HRTIMER_MODE_REL_SOFT);
+}
+
+static int j1939_session_tx_rts(struct j1939_session *session)
+{
+	u8 dat[8];
+	int ret;
+
+	memset(dat, 0xff, sizeof(dat));
+
+	dat[1] = (session->total_message_size >> 0);
+	dat[2] = (session->total_message_size >> 8);
+	dat[3] = session->pkt.total;
+
+	if (session->skcb.addr.type == J1939_ETP) {
+		dat[0] = J1939_ETP_CMD_RTS;
+		dat[1] = (session->total_message_size >> 0);
+		dat[2] = (session->total_message_size >> 8);
+		dat[3] = (session->total_message_size >> 16);
+		dat[4] = (session->total_message_size >> 24);
+	} else if (j1939_cb_is_broadcast(&session->skcb)) {
+		dat[0] = J1939_TP_CMD_BAM;
+		/* fake cts for broadcast */
+		session->pkt.tx = 0;
+	} else {
+		dat[0] = J1939_TP_CMD_RTS;
+		dat[4] = dat[3];
+	}
+
+	if (dat[0] == session->last_txcmd)
+		/* done already */
+		return 0;
+
+	ret = j1939_tp_tx_ctl(session, false, dat);
+	if (ret < 0)
+		return ret;
+
+	session->last_txcmd = dat[0];
+	if (dat[0] == J1939_TP_CMD_BAM) {
+		j1939_tp_schedule_txtimer(session, 50);
+		j1939_tp_set_rxtimeout(session, 250);
+	} else {
+		j1939_tp_set_rxtimeout(session, 1250);
+	}
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	return 0;
+}
+
+static int j1939_session_tx_dpo(struct j1939_session *session)
+{
+	unsigned int pkt;
+	u8 dat[8];
+	int ret;
+
+	memset(dat, 0xff, sizeof(dat));
+
+	dat[0] = J1939_ETP_CMD_DPO;
+	session->pkt.dpo = session->pkt.tx_acked;
+	pkt = session->pkt.dpo;
+	dat[1] = session->pkt.last - session->pkt.tx_acked;
+	dat[2] = (pkt >> 0);
+	dat[3] = (pkt >> 8);
+	dat[4] = (pkt >> 16);
+
+	ret = j1939_tp_tx_ctl(session, false, dat);
+	if (ret < 0)
+		return ret;
+
+	session->last_txcmd = dat[0];
+	j1939_tp_set_rxtimeout(session, 1250);
+	session->pkt.tx = session->pkt.tx_acked;
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	return 0;
+}
+
+static int j1939_session_tx_dat(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	struct j1939_sk_buff_cb *se_skcb;
+	int offset, pkt_done, pkt_end;
+	unsigned int len, pdelay;
+	struct sk_buff *se_skb;
+	const u8 *tpdat;
+	int ret = 0;
+	u8 dat[8];
+
+	se_skb = j1939_session_skb_get_by_offset(session, session->pkt.tx * 7);
+	if (!se_skb)
+		return -ENOBUFS;
+
+	se_skcb = j1939_skb_to_cb(se_skb);
+	tpdat = se_skb->data;
+	ret = 0;
+	pkt_done = 0;
+	if (session->skcb.addr.type != J1939_ETP &&
+	    j1939_cb_is_broadcast(&session->skcb))
+		pkt_end = session->pkt.total;
+	else
+		pkt_end = session->pkt.last;
+
+	while (session->pkt.tx < pkt_end) {
+		dat[0] = session->pkt.tx - session->pkt.dpo + 1;
+		offset = (session->pkt.tx * 7) - se_skcb->offset;
+		len =  se_skb->len - offset;
+		if (len > 7)
+			len = 7;
+
+		if (offset + len > se_skb->len) {
+			netdev_err_once(priv->ndev,
+					"%s: 0x%p: requested data outside of queued buffer: offset %i, len %i, pkt.tx: %i\n",
+					__func__, session, se_skcb->offset,
+					se_skb->len , session->pkt.tx);
+			ret = -EOVERFLOW;
+			goto out_free;
+		}
+
+		if (!len) {
+			ret = -ENOBUFS;
+			break;
+		}
+
+		memcpy(&dat[1], &tpdat[offset], len);
+		ret = j1939_tp_tx_dat(session, dat, len + 1);
+		if (ret < 0) {
+			/* ENOBUFS == CAN interface TX queue is full */
+			if (ret != -ENOBUFS)
+				netdev_alert(priv->ndev,
+					     "%s: 0x%p: queue data error: %i\n",
+					     __func__, session, ret);
+			break;
+		}
+
+		session->last_txcmd = 0xff;
+		pkt_done++;
+		session->pkt.tx++;
+		pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 :
+			j1939_tp_packet_delay;
+
+		if (session->pkt.tx < session->pkt.total && pdelay) {
+			j1939_tp_schedule_txtimer(session, pdelay);
+			break;
+		}
+	}
+
+	if (pkt_done)
+		j1939_tp_set_rxtimeout(session, 250);
+
+ out_free:
+	if (ret)
+		kfree_skb(se_skb);
+	else
+		consume_skb(se_skb);
+
+	return ret;
+}
+
+static int j1939_xtp_txnext_transmiter(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	int ret = 0;
+
+	if (!j1939_tp_im_transmitter(&session->skcb)) {
+		netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n",
+			     __func__, session);
+		return -EINVAL;
+	}
+
+	switch (session->last_cmd) {
+	case 0:
+		ret = j1939_session_tx_rts(session);
+		break;
+
+	case J1939_ETP_CMD_CTS:
+		if (session->last_txcmd != J1939_ETP_CMD_DPO) {
+			ret = j1939_session_tx_dpo(session);
+			if (ret)
+				return ret;
+		}
+
+		fallthrough;
+	case J1939_TP_CMD_CTS:
+	case 0xff: /* did some data */
+	case J1939_ETP_CMD_DPO:
+	case J1939_TP_CMD_BAM:
+		ret = j1939_session_tx_dat(session);
+
+		break;
+	default:
+		netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
+			     __func__, session, session->last_cmd);
+	}
+
+	return ret;
+}
+
+static int j1939_session_tx_cts(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	unsigned int pkt, len;
+	int ret;
+	u8 dat[8];
+
+	if (!j1939_sk_recv_match(priv, &session->skcb))
+		return -ENOENT;
+
+	len = session->pkt.total - session->pkt.rx;
+	len = min3(len, session->pkt.block, j1939_tp_block ?: 255);
+	memset(dat, 0xff, sizeof(dat));
+
+	if (session->skcb.addr.type == J1939_ETP) {
+		pkt = session->pkt.rx + 1;
+		dat[0] = J1939_ETP_CMD_CTS;
+		dat[1] = len;
+		dat[2] = (pkt >> 0);
+		dat[3] = (pkt >> 8);
+		dat[4] = (pkt >> 16);
+	} else {
+		dat[0] = J1939_TP_CMD_CTS;
+		dat[1] = len;
+		dat[2] = session->pkt.rx + 1;
+	}
+
+	if (dat[0] == session->last_txcmd)
+		/* done already */
+		return 0;
+
+	ret = j1939_tp_tx_ctl(session, true, dat);
+	if (ret < 0)
+		return ret;
+
+	if (len)
+		/* only mark cts done when len is set */
+		session->last_txcmd = dat[0];
+	j1939_tp_set_rxtimeout(session, 1250);
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	return 0;
+}
+
+static int j1939_session_tx_eoma(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	u8 dat[8];
+	int ret;
+
+	if (!j1939_sk_recv_match(priv, &session->skcb))
+		return -ENOENT;
+
+	memset(dat, 0xff, sizeof(dat));
+
+	if (session->skcb.addr.type == J1939_ETP) {
+		dat[0] = J1939_ETP_CMD_EOMA;
+		dat[1] = session->total_message_size >> 0;
+		dat[2] = session->total_message_size >> 8;
+		dat[3] = session->total_message_size >> 16;
+		dat[4] = session->total_message_size >> 24;
+	} else {
+		dat[0] = J1939_TP_CMD_EOMA;
+		dat[1] = session->total_message_size;
+		dat[2] = session->total_message_size >> 8;
+		dat[3] = session->pkt.total;
+	}
+
+	if (dat[0] == session->last_txcmd)
+		/* done already */
+		return 0;
+
+	ret = j1939_tp_tx_ctl(session, true, dat);
+	if (ret < 0)
+		return ret;
+
+	session->last_txcmd = dat[0];
+
+	/* wait for the EOMA packet to come in */
+	j1939_tp_set_rxtimeout(session, 1250);
+
+	netdev_dbg(session->priv->ndev, "%p: 0x%p\n", __func__, session);
+
+	return 0;
+}
+
+static int j1939_xtp_txnext_receiver(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	int ret = 0;
+
+	if (!j1939_tp_im_receiver(&session->skcb)) {
+		netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n",
+			     __func__, session);
+		return -EINVAL;
+	}
+
+	switch (session->last_cmd) {
+	case J1939_TP_CMD_RTS:
+	case J1939_ETP_CMD_RTS:
+		ret = j1939_session_tx_cts(session);
+		break;
+
+	case J1939_ETP_CMD_CTS:
+	case J1939_TP_CMD_CTS:
+	case 0xff: /* did some data */
+	case J1939_ETP_CMD_DPO:
+		if ((session->skcb.addr.type == J1939_TP &&
+		     j1939_cb_is_broadcast(&session->skcb)))
+			break;
+
+		if (session->pkt.rx >= session->pkt.total) {
+			ret = j1939_session_tx_eoma(session);
+		} else if (session->pkt.rx >= session->pkt.last) {
+			session->last_txcmd = 0;
+			ret = j1939_session_tx_cts(session);
+		}
+		break;
+	default:
+		netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
+			     __func__, session, session->last_cmd);
+	}
+
+	return ret;
+}
+
+static int j1939_simple_txnext(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	struct sk_buff *se_skb = j1939_session_skb_get(session);
+	struct sk_buff *skb;
+	int ret;
+
+	if (!se_skb)
+		return 0;
+
+	skb = skb_clone(se_skb, GFP_ATOMIC);
+	if (!skb) {
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	can_skb_set_owner(skb, se_skb->sk);
+
+	j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS);
+
+	ret = j1939_send_one(priv, skb);
+	if (ret)
+		goto out_free;
+
+	j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_SCHED);
+	j1939_sk_queue_activate_next(session);
+
+ out_free:
+	if (ret)
+		kfree_skb(se_skb);
+	else
+		consume_skb(se_skb);
+
+	return ret;
+}
+
+static bool j1939_session_deactivate_locked(struct j1939_session *session)
+{
+	bool active = false;
+
+	lockdep_assert_held(&session->priv->active_session_list_lock);
+
+	if (session->state >= J1939_SESSION_ACTIVE &&
+	    session->state < J1939_SESSION_ACTIVE_MAX) {
+		active = true;
+
+		list_del_init(&session->active_session_list_entry);
+		session->state = J1939_SESSION_DONE;
+		j1939_session_put(session);
+	}
+
+	return active;
+}
+
+static bool j1939_session_deactivate(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	bool active;
+
+	j1939_session_list_lock(priv);
+	active = j1939_session_deactivate_locked(session);
+	j1939_session_list_unlock(priv);
+
+	return active;
+}
+
+static void
+j1939_session_deactivate_activate_next(struct j1939_session *session)
+{
+	if (j1939_session_deactivate(session))
+		j1939_sk_queue_activate_next(session);
+}
+
+static void __j1939_session_cancel(struct j1939_session *session,
+				   enum j1939_xtp_abort err)
+{
+	struct j1939_priv *priv = session->priv;
+
+	WARN_ON_ONCE(!err);
+	lockdep_assert_held(&session->priv->active_session_list_lock);
+
+	session->err = j1939_xtp_abort_to_errno(priv, err);
+	session->state = J1939_SESSION_WAITING_ABORT;
+	/* do not send aborts on incoming broadcasts */
+	if (!j1939_cb_is_broadcast(&session->skcb)) {
+		j1939_xtp_tx_abort(priv, &session->skcb,
+				   !session->transmission,
+				   err, session->skcb.addr.pgn);
+	}
+
+	if (session->sk)
+		j1939_sk_send_loop_abort(session->sk, session->err);
+}
+
+static void j1939_session_cancel(struct j1939_session *session,
+				 enum j1939_xtp_abort err)
+{
+	j1939_session_list_lock(session->priv);
+
+	if (session->state >= J1939_SESSION_ACTIVE &&
+	    session->state < J1939_SESSION_WAITING_ABORT) {
+		j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS);
+		__j1939_session_cancel(session, err);
+	}
+
+	j1939_session_list_unlock(session->priv);
+
+	if (!session->sk)
+		j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
+}
+
+static enum hrtimer_restart j1939_tp_txtimer(struct hrtimer *hrtimer)
+{
+	struct j1939_session *session =
+		container_of(hrtimer, struct j1939_session, txtimer);
+	struct j1939_priv *priv = session->priv;
+	int ret = 0;
+
+	if (session->skcb.addr.type == J1939_SIMPLE) {
+		ret = j1939_simple_txnext(session);
+	} else {
+		if (session->transmission)
+			ret = j1939_xtp_txnext_transmiter(session);
+		else
+			ret = j1939_xtp_txnext_receiver(session);
+	}
+
+	switch (ret) {
+	case -ENOBUFS:
+		/* Retry limit is currently arbitrary chosen */
+		if (session->tx_retry < J1939_XTP_TX_RETRY_LIMIT) {
+			session->tx_retry++;
+			j1939_tp_schedule_txtimer(session,
+						  10 + prandom_u32_max(16));
+		} else {
+			netdev_alert(priv->ndev, "%s: 0x%p: tx retry count reached\n",
+				     __func__, session);
+			session->err = -ENETUNREACH;
+			j1939_session_rxtimer_cancel(session);
+			j1939_session_deactivate_activate_next(session);
+		}
+		break;
+	case -ENETDOWN:
+		/* In this case we should get a netdev_event(), all active
+		 * sessions will be cleared by
+		 * j1939_cancel_all_active_sessions(). So handle this as an
+		 * error, but let j1939_cancel_all_active_sessions() do the
+		 * cleanup including propagation of the error to user space.
+		 */
+		break;
+	case -EOVERFLOW:
+		j1939_session_cancel(session, J1939_XTP_ABORT_ECTS_TOO_BIG);
+		break;
+	case 0:
+		session->tx_retry = 0;
+		break;
+	default:
+		netdev_alert(priv->ndev, "%s: 0x%p: tx aborted with unknown reason: %i\n",
+			     __func__, session, ret);
+		if (session->skcb.addr.type != J1939_SIMPLE) {
+			j1939_session_cancel(session, J1939_XTP_ABORT_OTHER);
+		} else {
+			session->err = ret;
+			j1939_session_rxtimer_cancel(session);
+			j1939_session_deactivate_activate_next(session);
+		}
+	}
+
+	j1939_session_put(session);
+
+	return HRTIMER_NORESTART;
+}
+
+static void j1939_session_completed(struct j1939_session *session)
+{
+	struct sk_buff *se_skb;
+
+	if (!session->transmission) {
+		se_skb = j1939_session_skb_get(session);
+		/* distribute among j1939 receivers */
+		j1939_sk_recv(session->priv, se_skb);
+		consume_skb(se_skb);
+	}
+
+	j1939_session_deactivate_activate_next(session);
+}
+
+static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer)
+{
+	struct j1939_session *session = container_of(hrtimer,
+						     struct j1939_session,
+						     rxtimer);
+	struct j1939_priv *priv = session->priv;
+
+	if (session->state == J1939_SESSION_WAITING_ABORT) {
+		netdev_alert(priv->ndev, "%s: 0x%p: abort rx timeout. Force session deactivation\n",
+			     __func__, session);
+
+		j1939_session_deactivate_activate_next(session);
+
+	} else if (session->skcb.addr.type == J1939_SIMPLE) {
+		netdev_alert(priv->ndev, "%s: 0x%p: Timeout. Failed to send simple message.\n",
+			     __func__, session);
+
+		/* The message is probably stuck in the CAN controller and can
+		 * be send as soon as CAN bus is in working state again.
+		 */
+		session->err = -ETIME;
+		j1939_session_deactivate(session);
+	} else {
+		j1939_session_list_lock(session->priv);
+		if (session->state >= J1939_SESSION_ACTIVE &&
+		    session->state < J1939_SESSION_ACTIVE_MAX) {
+			netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n",
+				     __func__, session);
+			j1939_session_get(session);
+			hrtimer_start(&session->rxtimer,
+				      ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS),
+				      HRTIMER_MODE_REL_SOFT);
+			__j1939_session_cancel(session, J1939_XTP_ABORT_TIMEOUT);
+		}
+		j1939_session_list_unlock(session->priv);
+
+		if (!session->sk)
+			j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
+	}
+
+	j1939_session_put(session);
+
+	return HRTIMER_NORESTART;
+}
+
+static bool j1939_xtp_rx_cmd_bad_pgn(struct j1939_session *session,
+				     const struct sk_buff *skb)
+{
+	const struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	pgn_t pgn = j1939_xtp_ctl_to_pgn(skb->data);
+	struct j1939_priv *priv = session->priv;
+	enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
+	u8 cmd = skb->data[0];
+
+	if (session->skcb.addr.pgn == pgn)
+		return false;
+
+	switch (cmd) {
+	case J1939_TP_CMD_BAM:
+		abort = J1939_XTP_NO_ABORT;
+		break;
+
+	case J1939_ETP_CMD_RTS:
+		fallthrough;
+	case J1939_TP_CMD_RTS:
+		abort = J1939_XTP_ABORT_BUSY;
+		break;
+
+	case J1939_ETP_CMD_CTS:
+		fallthrough;
+	case J1939_TP_CMD_CTS:
+		abort = J1939_XTP_ABORT_ECTS_UNXPECTED_PGN;
+		break;
+
+	case J1939_ETP_CMD_DPO:
+		abort = J1939_XTP_ABORT_BAD_EDPO_PGN;
+		break;
+
+	case J1939_ETP_CMD_EOMA:
+		fallthrough;
+	case J1939_TP_CMD_EOMA:
+		abort = J1939_XTP_ABORT_OTHER;
+		break;
+
+	case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */
+		abort = J1939_XTP_NO_ABORT;
+		break;
+
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	netdev_warn(priv->ndev, "%s: 0x%p: CMD 0x%02x with PGN 0x%05x for running session with different PGN 0x%05x.\n",
+		    __func__, session, cmd, pgn, session->skcb.addr.pgn);
+	if (abort != J1939_XTP_NO_ABORT)
+		j1939_xtp_tx_abort(priv, skcb, true, abort, pgn);
+
+	return true;
+}
+
+static void j1939_xtp_rx_abort_one(struct j1939_priv *priv, struct sk_buff *skb,
+				   bool reverse, bool transmitter)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+	u8 abort = skb->data[1];
+
+	session = j1939_session_get_by_addr(priv, &skcb->addr, reverse,
+					    transmitter);
+	if (!session)
+		return;
+
+	if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
+		goto abort_put;
+
+	netdev_info(priv->ndev, "%s: 0x%p: 0x%05x: (%u) %s\n", __func__,
+		    session, j1939_xtp_ctl_to_pgn(skb->data), abort,
+		    j1939_xtp_abort_to_str(abort));
+
+	j1939_session_timers_cancel(session);
+	session->err = j1939_xtp_abort_to_errno(priv, abort);
+	if (session->sk)
+		j1939_sk_send_loop_abort(session->sk, session->err);
+	else
+		j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
+	j1939_session_deactivate_activate_next(session);
+
+abort_put:
+	j1939_session_put(session);
+}
+
+/* abort packets may come in 2 directions */
+static void
+j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb,
+		   bool transmitter)
+{
+	j1939_xtp_rx_abort_one(priv, skb, false, transmitter);
+	j1939_xtp_rx_abort_one(priv, skb, true, transmitter);
+}
+
+static void
+j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	const u8 *dat;
+	int len;
+
+	if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
+		return;
+
+	dat = skb->data;
+
+	if (skcb->addr.type == J1939_ETP)
+		len = j1939_etp_ctl_to_size(dat);
+	else
+		len = j1939_tp_ctl_to_size(dat);
+
+	if (session->total_message_size != len) {
+		netdev_warn_once(session->priv->ndev,
+				 "%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n",
+				 __func__, session, session->total_message_size,
+				 len);
+	}
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	session->pkt.tx_acked = session->pkt.total;
+	j1939_session_timers_cancel(session);
+	/* transmitted without problems */
+	j1939_session_completed(session);
+}
+
+static void
+j1939_xtp_rx_eoma(struct j1939_priv *priv, struct sk_buff *skb,
+		  bool transmitter)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+
+	session = j1939_session_get_by_addr(priv, &skcb->addr, true,
+					    transmitter);
+	if (!session)
+		return;
+
+	j1939_xtp_rx_eoma_one(session, skb);
+	j1939_session_put(session);
+}
+
+static void
+j1939_xtp_rx_cts_one(struct j1939_session *session, struct sk_buff *skb)
+{
+	enum j1939_xtp_abort err = J1939_XTP_ABORT_FAULT;
+	unsigned int pkt;
+	const u8 *dat;
+
+	dat = skb->data;
+
+	if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
+		return;
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	if (session->last_cmd == dat[0]) {
+		err = J1939_XTP_ABORT_DUP_SEQ;
+		goto out_session_cancel;
+	}
+
+	if (session->skcb.addr.type == J1939_ETP)
+		pkt = j1939_etp_ctl_to_packet(dat);
+	else
+		pkt = dat[2];
+
+	if (!pkt)
+		goto out_session_cancel;
+	else if (dat[1] > session->pkt.block /* 0xff for etp */)
+		goto out_session_cancel;
+
+	/* set packet counters only when not CTS(0) */
+	session->pkt.tx_acked = pkt - 1;
+	j1939_session_skb_drop_old(session);
+	session->pkt.last = session->pkt.tx_acked + dat[1];
+	if (session->pkt.last > session->pkt.total)
+		/* safety measure */
+		session->pkt.last = session->pkt.total;
+	/* TODO: do not set tx here, do it in txtimer */
+	session->pkt.tx = session->pkt.tx_acked;
+
+	session->last_cmd = dat[0];
+	if (dat[1]) {
+		j1939_tp_set_rxtimeout(session, 1250);
+		if (session->transmission) {
+			if (session->pkt.tx_acked)
+				j1939_sk_errqueue(session,
+						  J1939_ERRQUEUE_TX_SCHED);
+			j1939_session_txtimer_cancel(session);
+			j1939_tp_schedule_txtimer(session, 0);
+		}
+	} else {
+		/* CTS(0) */
+		j1939_tp_set_rxtimeout(session, 550);
+	}
+	return;
+
+ out_session_cancel:
+	j1939_session_timers_cancel(session);
+	j1939_session_cancel(session, err);
+}
+
+static void
+j1939_xtp_rx_cts(struct j1939_priv *priv, struct sk_buff *skb, bool transmitter)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+
+	session = j1939_session_get_by_addr(priv, &skcb->addr, true,
+					    transmitter);
+	if (!session)
+		return;
+	j1939_xtp_rx_cts_one(session, skb);
+	j1939_session_put(session);
+}
+
+static struct j1939_session *j1939_session_new(struct j1939_priv *priv,
+					       struct sk_buff *skb, size_t size)
+{
+	struct j1939_session *session;
+	struct j1939_sk_buff_cb *skcb;
+
+	session = kzalloc(sizeof(*session), gfp_any());
+	if (!session)
+		return NULL;
+
+	INIT_LIST_HEAD(&session->active_session_list_entry);
+	INIT_LIST_HEAD(&session->sk_session_queue_entry);
+	kref_init(&session->kref);
+
+	j1939_priv_get(priv);
+	session->priv = priv;
+	session->total_message_size = size;
+	session->state = J1939_SESSION_NEW;
+
+	skb_queue_head_init(&session->skb_queue);
+	skb_queue_tail(&session->skb_queue, skb);
+
+	skcb = j1939_skb_to_cb(skb);
+	memcpy(&session->skcb, skcb, sizeof(session->skcb));
+
+	hrtimer_init(&session->txtimer, CLOCK_MONOTONIC,
+		     HRTIMER_MODE_REL_SOFT);
+	session->txtimer.function = j1939_tp_txtimer;
+	hrtimer_init(&session->rxtimer, CLOCK_MONOTONIC,
+		     HRTIMER_MODE_REL_SOFT);
+	session->rxtimer.function = j1939_tp_rxtimer;
+
+	netdev_dbg(priv->ndev, "%s: 0x%p: sa: %02x, da: %02x\n",
+		   __func__, session, skcb->addr.sa, skcb->addr.da);
+
+	return session;
+}
+
+static struct
+j1939_session *j1939_session_fresh_new(struct j1939_priv *priv,
+				       int size,
+				       const struct j1939_sk_buff_cb *rel_skcb)
+{
+	struct sk_buff *skb;
+	struct j1939_sk_buff_cb *skcb;
+	struct j1939_session *session;
+
+	skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC);
+	if (unlikely(!skb))
+		return NULL;
+
+	skb->dev = priv->ndev;
+	can_skb_reserve(skb);
+	can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
+	can_skb_prv(skb)->skbcnt = 0;
+	skcb = j1939_skb_to_cb(skb);
+	memcpy(skcb, rel_skcb, sizeof(*skcb));
+
+	session = j1939_session_new(priv, skb, size);
+	if (!session) {
+		kfree_skb(skb);
+		return NULL;
+	}
+
+	/* alloc data area */
+	skb_put(skb, size);
+	/* skb is recounted in j1939_session_new() */
+	return session;
+}
+
+int j1939_session_activate(struct j1939_session *session)
+{
+	struct j1939_priv *priv = session->priv;
+	struct j1939_session *active = NULL;
+	int ret = 0;
+
+	j1939_session_list_lock(priv);
+	if (session->skcb.addr.type != J1939_SIMPLE)
+		active = j1939_session_get_by_addr_locked(priv,
+							  &priv->active_session_list,
+							  &session->skcb.addr, false,
+							  session->transmission);
+	if (active) {
+		j1939_session_put(active);
+		ret = -EAGAIN;
+	} else {
+		WARN_ON_ONCE(session->state != J1939_SESSION_NEW);
+		list_add_tail(&session->active_session_list_entry,
+			      &priv->active_session_list);
+		j1939_session_get(session);
+		session->state = J1939_SESSION_ACTIVE;
+
+		netdev_dbg(session->priv->ndev, "%s: 0x%p\n",
+			   __func__, session);
+	}
+	j1939_session_list_unlock(priv);
+
+	return ret;
+}
+
+static struct
+j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv,
+					    struct sk_buff *skb)
+{
+	enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
+	struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+	const u8 *dat;
+	pgn_t pgn;
+	int len;
+
+	netdev_dbg(priv->ndev, "%s\n", __func__);
+
+	dat = skb->data;
+	pgn = j1939_xtp_ctl_to_pgn(dat);
+	skcb.addr.pgn = pgn;
+
+	if (!j1939_sk_recv_match(priv, &skcb))
+		return NULL;
+
+	if (skcb.addr.type == J1939_ETP) {
+		len = j1939_etp_ctl_to_size(dat);
+		if (len > J1939_MAX_ETP_PACKET_SIZE)
+			abort = J1939_XTP_ABORT_FAULT;
+		else if (len > priv->tp_max_packet_size)
+			abort = J1939_XTP_ABORT_RESOURCE;
+		else if (len <= J1939_MAX_TP_PACKET_SIZE)
+			abort = J1939_XTP_ABORT_FAULT;
+	} else {
+		len = j1939_tp_ctl_to_size(dat);
+		if (len > J1939_MAX_TP_PACKET_SIZE)
+			abort = J1939_XTP_ABORT_FAULT;
+		else if (len > priv->tp_max_packet_size)
+			abort = J1939_XTP_ABORT_RESOURCE;
+		else if (len < J1939_MIN_TP_PACKET_SIZE)
+			abort = J1939_XTP_ABORT_FAULT;
+	}
+
+	if (abort != J1939_XTP_NO_ABORT) {
+		j1939_xtp_tx_abort(priv, &skcb, true, abort, pgn);
+		return NULL;
+	}
+
+	session = j1939_session_fresh_new(priv, len, &skcb);
+	if (!session) {
+		j1939_xtp_tx_abort(priv, &skcb, true,
+				   J1939_XTP_ABORT_RESOURCE, pgn);
+		return NULL;
+	}
+
+	/* initialize the control buffer: plain copy */
+	session->pkt.total = (len + 6) / 7;
+	session->pkt.block = 0xff;
+	if (skcb.addr.type != J1939_ETP) {
+		if (dat[3] != session->pkt.total)
+			netdev_alert(priv->ndev, "%s: 0x%p: strange total, %u != %u\n",
+				     __func__, session, session->pkt.total,
+				     dat[3]);
+		session->pkt.total = dat[3];
+		session->pkt.block = min(dat[3], dat[4]);
+	}
+
+	session->pkt.rx = 0;
+	session->pkt.tx = 0;
+
+	session->tskey = priv->rx_tskey++;
+	j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_RTS);
+
+	WARN_ON_ONCE(j1939_session_activate(session));
+
+	return session;
+}
+
+static int j1939_xtp_rx_rts_session_active(struct j1939_session *session,
+					   struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_priv *priv = session->priv;
+
+	if (!session->transmission) {
+		if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
+			return -EBUSY;
+
+		/* RTS on active session */
+		j1939_session_timers_cancel(session);
+		j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
+	}
+
+	if (session->last_cmd != 0) {
+		/* we received a second rts on the same connection */
+		netdev_alert(priv->ndev, "%s: 0x%p: connection exists (%02x %02x). last cmd: %x\n",
+			     __func__, session, skcb->addr.sa, skcb->addr.da,
+			     session->last_cmd);
+
+		j1939_session_timers_cancel(session);
+		j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
+
+		return -EBUSY;
+	}
+
+	if (session->skcb.addr.sa != skcb->addr.sa ||
+	    session->skcb.addr.da != skcb->addr.da)
+		netdev_warn(priv->ndev, "%s: 0x%p: session->skcb.addr.sa=0x%02x skcb->addr.sa=0x%02x session->skcb.addr.da=0x%02x skcb->addr.da=0x%02x\n",
+			    __func__, session,
+			    session->skcb.addr.sa, skcb->addr.sa,
+			    session->skcb.addr.da, skcb->addr.da);
+	/* make sure 'sa' & 'da' are correct !
+	 * They may be 'not filled in yet' for sending
+	 * skb's, since they did not pass the Address Claim ever.
+	 */
+	session->skcb.addr.sa = skcb->addr.sa;
+	session->skcb.addr.da = skcb->addr.da;
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	return 0;
+}
+
+static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb,
+			     bool transmitter)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+	u8 cmd = skb->data[0];
+
+	session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+					    transmitter);
+
+	if (!session) {
+		if (transmitter) {
+			/* If we're the transmitter and this function is called,
+			 * we received our own RTS. A session has already been
+			 * created.
+			 *
+			 * For some reasons however it might have been destroyed
+			 * already. So don't create a new one here (using
+			 * "j1939_xtp_rx_rts_session_new()") as this will be a
+			 * receiver session.
+			 *
+			 * The reasons the session is already destroyed might
+			 * be:
+			 * - user space closed socket was and the session was
+			 *   aborted
+			 * - session was aborted due to external abort message
+			 */
+			return;
+		}
+		session = j1939_xtp_rx_rts_session_new(priv, skb);
+		if (!session) {
+			if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb))
+				netdev_info(priv->ndev, "%s: failed to create TP BAM session\n",
+					    __func__);
+			return;
+		}
+	} else {
+		if (j1939_xtp_rx_rts_session_active(session, skb)) {
+			j1939_session_put(session);
+			return;
+		}
+	}
+	session->last_cmd = cmd;
+
+	if (cmd == J1939_TP_CMD_BAM) {
+		if (!session->transmission)
+			j1939_tp_set_rxtimeout(session, 750);
+	} else {
+		if (!session->transmission) {
+			j1939_session_txtimer_cancel(session);
+			j1939_tp_schedule_txtimer(session, 0);
+		}
+		j1939_tp_set_rxtimeout(session, 1250);
+	}
+
+	j1939_session_put(session);
+}
+
+static void j1939_xtp_rx_dpo_one(struct j1939_session *session,
+				 struct sk_buff *skb)
+{
+	const u8 *dat = skb->data;
+
+	if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
+		return;
+
+	netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
+
+	/* transmitted without problems */
+	session->pkt.dpo = j1939_etp_ctl_to_packet(skb->data);
+	session->last_cmd = dat[0];
+	j1939_tp_set_rxtimeout(session, 750);
+
+	if (!session->transmission)
+		j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_DPO);
+}
+
+static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb,
+			     bool transmitter)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+
+	session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+					    transmitter);
+	if (!session) {
+		netdev_info(priv->ndev,
+			    "%s: no connection found\n", __func__);
+		return;
+	}
+
+	j1939_xtp_rx_dpo_one(session, skb);
+	j1939_session_put(session);
+}
+
+static void j1939_xtp_rx_dat_one(struct j1939_session *session,
+				 struct sk_buff *skb)
+{
+	enum j1939_xtp_abort abort = J1939_XTP_ABORT_FAULT;
+	struct j1939_priv *priv = session->priv;
+	struct j1939_sk_buff_cb *skcb, *se_skcb;
+	struct sk_buff *se_skb = NULL;
+	const u8 *dat;
+	u8 *tpdat;
+	int offset;
+	int nbytes;
+	bool final = false;
+	bool remain = false;
+	bool do_cts_eoma = false;
+	int packet;
+
+	skcb = j1939_skb_to_cb(skb);
+	dat = skb->data;
+	if (skb->len != 8) {
+		/* makes no sense */
+		abort = J1939_XTP_ABORT_UNEXPECTED_DATA;
+		goto out_session_cancel;
+	}
+
+	switch (session->last_cmd) {
+	case 0xff:
+		break;
+	case J1939_ETP_CMD_DPO:
+		if (skcb->addr.type == J1939_ETP)
+			break;
+		fallthrough;
+	case J1939_TP_CMD_BAM:
+		fallthrough;
+	case J1939_TP_CMD_CTS:
+		if (skcb->addr.type != J1939_ETP)
+			break;
+		fallthrough;
+	default:
+		netdev_info(priv->ndev, "%s: 0x%p: last %02x\n", __func__,
+			    session, session->last_cmd);
+		goto out_session_cancel;
+	}
+
+	packet = (dat[0] - 1 + session->pkt.dpo);
+	if (packet > session->pkt.total ||
+	    (session->pkt.rx + 1) > session->pkt.total) {
+		netdev_info(priv->ndev, "%s: 0x%p: should have been completed\n",
+			    __func__, session);
+		goto out_session_cancel;
+	}
+
+	se_skb = j1939_session_skb_get_by_offset(session, packet * 7);
+	if (!se_skb) {
+		netdev_warn(priv->ndev, "%s: 0x%p: no skb found\n", __func__,
+			    session);
+		goto out_session_cancel;
+	}
+
+	se_skcb = j1939_skb_to_cb(se_skb);
+	offset = packet * 7 - se_skcb->offset;
+	nbytes = se_skb->len - offset;
+	if (nbytes > 7)
+		nbytes = 7;
+	if (nbytes <= 0 || (nbytes + 1) > skb->len) {
+		netdev_info(priv->ndev, "%s: 0x%p: nbytes %i, len %i\n",
+			    __func__, session, nbytes, skb->len);
+		goto out_session_cancel;
+	}
+
+	tpdat = se_skb->data;
+	if (!session->transmission) {
+		memcpy(&tpdat[offset], &dat[1], nbytes);
+	} else {
+		int err;
+
+		err = memcmp(&tpdat[offset], &dat[1], nbytes);
+		if (err)
+			netdev_err_once(priv->ndev,
+					"%s: 0x%p: Data of RX-looped back packet (%*ph) doesn't match TX data (%*ph)!\n",
+					__func__, session,
+					nbytes, &dat[1],
+					nbytes, &tpdat[offset]);
+	}
+
+	if (packet == session->pkt.rx)
+		session->pkt.rx++;
+
+	if (se_skcb->addr.type != J1939_ETP &&
+	    j1939_cb_is_broadcast(&session->skcb)) {
+		if (session->pkt.rx >= session->pkt.total)
+			final = true;
+		else
+			remain = true;
+	} else {
+		/* never final, an EOMA must follow */
+		if (session->pkt.rx >= session->pkt.last)
+			do_cts_eoma = true;
+	}
+
+	if (final) {
+		j1939_session_timers_cancel(session);
+		j1939_session_completed(session);
+	} else if (remain) {
+		if (!session->transmission)
+			j1939_tp_set_rxtimeout(session, 750);
+	} else if (do_cts_eoma) {
+		j1939_tp_set_rxtimeout(session, 1250);
+		if (!session->transmission)
+			j1939_tp_schedule_txtimer(session, 0);
+	} else {
+		j1939_tp_set_rxtimeout(session, 750);
+	}
+	session->last_cmd = 0xff;
+	consume_skb(se_skb);
+	j1939_session_put(session);
+
+	return;
+
+ out_session_cancel:
+	kfree_skb(se_skb);
+	j1939_session_timers_cancel(session);
+	j1939_session_cancel(session, abort);
+	j1939_session_put(session);
+}
+
+static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb;
+	struct j1939_session *session;
+
+	skcb = j1939_skb_to_cb(skb);
+
+	if (j1939_tp_im_transmitter(skcb)) {
+		session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+						    true);
+		if (!session)
+			netdev_info(priv->ndev, "%s: no tx connection found\n",
+				    __func__);
+		else
+			j1939_xtp_rx_dat_one(session, skb);
+	}
+
+	if (j1939_tp_im_receiver(skcb)) {
+		session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+						    false);
+		if (!session)
+			netdev_info(priv->ndev, "%s: no rx connection found\n",
+				    __func__);
+		else
+			j1939_xtp_rx_dat_one(session, skb);
+	}
+
+	if (j1939_cb_is_broadcast(skcb)) {
+		session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+						    false);
+		if (session)
+			j1939_xtp_rx_dat_one(session, skb);
+	}
+}
+
+/* j1939 main intf */
+struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
+				    struct sk_buff *skb, size_t size)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	struct j1939_session *session;
+	int ret;
+
+	if (skcb->addr.pgn == J1939_TP_PGN_DAT ||
+	    skcb->addr.pgn == J1939_TP_PGN_CTL ||
+	    skcb->addr.pgn == J1939_ETP_PGN_DAT ||
+	    skcb->addr.pgn == J1939_ETP_PGN_CTL)
+		/* avoid conflict */
+		return ERR_PTR(-EDOM);
+
+	if (size > priv->tp_max_packet_size)
+		return ERR_PTR(-EMSGSIZE);
+
+	if (size <= 8)
+		skcb->addr.type = J1939_SIMPLE;
+	else if (size > J1939_MAX_TP_PACKET_SIZE)
+		skcb->addr.type = J1939_ETP;
+	else
+		skcb->addr.type = J1939_TP;
+
+	if (skcb->addr.type == J1939_ETP &&
+	    j1939_cb_is_broadcast(skcb))
+		return ERR_PTR(-EDESTADDRREQ);
+
+	/* fill in addresses from names */
+	ret = j1939_ac_fixup(priv, skb);
+	if (unlikely(ret))
+		return ERR_PTR(ret);
+
+	/* fix DST flags, it may be used there soon */
+	if (j1939_address_is_unicast(skcb->addr.da) &&
+	    priv->ents[skcb->addr.da].nusers)
+		skcb->flags |= J1939_ECU_LOCAL_DST;
+
+	/* src is always local, I'm sending ... */
+	skcb->flags |= J1939_ECU_LOCAL_SRC;
+
+	/* prepare new session */
+	session = j1939_session_new(priv, skb, size);
+	if (!session)
+		return ERR_PTR(-ENOMEM);
+
+	/* skb is recounted in j1939_session_new() */
+	sock_hold(skb->sk);
+	session->sk = skb->sk;
+	session->transmission = true;
+	session->pkt.total = (size + 6) / 7;
+	session->pkt.block = skcb->addr.type == J1939_ETP ? 255 :
+		min(j1939_tp_block ?: 255, session->pkt.total);
+
+	if (j1939_cb_is_broadcast(&session->skcb))
+		/* set the end-packet for broadcast */
+		session->pkt.last = session->pkt.total;
+
+	skcb->tskey = atomic_inc_return(&session->sk->sk_tskey) - 1;
+	session->tskey = skcb->tskey;
+
+	return session;
+}
+
+static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+	int extd = J1939_TP;
+	u8 cmd = skb->data[0];
+
+	switch (cmd) {
+	case J1939_ETP_CMD_RTS:
+		extd = J1939_ETP;
+		fallthrough;
+	case J1939_TP_CMD_BAM:
+		if (cmd == J1939_TP_CMD_BAM && !j1939_cb_is_broadcast(skcb)) {
+			netdev_err_once(priv->ndev, "%s: BAM to unicast (%02x), ignoring!\n",
+					__func__, skcb->addr.sa);
+			return;
+		}
+		fallthrough;
+	case J1939_TP_CMD_RTS:
+		if (skcb->addr.type != extd)
+			return;
+
+		if (cmd == J1939_TP_CMD_RTS && j1939_cb_is_broadcast(skcb)) {
+			netdev_alert(priv->ndev, "%s: rts without destination (%02x)\n",
+				     __func__, skcb->addr.sa);
+			return;
+		}
+
+		if (j1939_tp_im_transmitter(skcb))
+			j1939_xtp_rx_rts(priv, skb, true);
+
+		if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb))
+			j1939_xtp_rx_rts(priv, skb, false);
+
+		break;
+
+	case J1939_ETP_CMD_CTS:
+		extd = J1939_ETP;
+		fallthrough;
+	case J1939_TP_CMD_CTS:
+		if (skcb->addr.type != extd)
+			return;
+
+		if (j1939_tp_im_transmitter(skcb))
+			j1939_xtp_rx_cts(priv, skb, false);
+
+		if (j1939_tp_im_receiver(skcb))
+			j1939_xtp_rx_cts(priv, skb, true);
+
+		break;
+
+	case J1939_ETP_CMD_DPO:
+		if (skcb->addr.type != J1939_ETP)
+			return;
+
+		if (j1939_tp_im_transmitter(skcb))
+			j1939_xtp_rx_dpo(priv, skb, true);
+
+		if (j1939_tp_im_receiver(skcb))
+			j1939_xtp_rx_dpo(priv, skb, false);
+
+		break;
+
+	case J1939_ETP_CMD_EOMA:
+		extd = J1939_ETP;
+		fallthrough;
+	case J1939_TP_CMD_EOMA:
+		if (skcb->addr.type != extd)
+			return;
+
+		if (j1939_tp_im_transmitter(skcb))
+			j1939_xtp_rx_eoma(priv, skb, false);
+
+		if (j1939_tp_im_receiver(skcb))
+			j1939_xtp_rx_eoma(priv, skb, true);
+
+		break;
+
+	case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */
+		if (j1939_cb_is_broadcast(skcb)) {
+			netdev_err_once(priv->ndev, "%s: abort to broadcast (%02x), ignoring!\n",
+					__func__, skcb->addr.sa);
+			return;
+		}
+
+		if (j1939_tp_im_transmitter(skcb))
+			j1939_xtp_rx_abort(priv, skb, true);
+
+		if (j1939_tp_im_receiver(skcb))
+			j1939_xtp_rx_abort(priv, skb, false);
+
+		break;
+	default:
+		return;
+	}
+}
+
+int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb)
+{
+	struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
+
+	if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb))
+		return 0;
+
+	switch (skcb->addr.pgn) {
+	case J1939_ETP_PGN_DAT:
+		skcb->addr.type = J1939_ETP;
+		fallthrough;
+	case J1939_TP_PGN_DAT:
+		j1939_xtp_rx_dat(priv, skb);
+		break;
+
+	case J1939_ETP_PGN_CTL:
+		skcb->addr.type = J1939_ETP;
+		fallthrough;
+	case J1939_TP_PGN_CTL:
+		if (skb->len < 8)
+			return 0; /* Don't care. Nothing to extract here */
+
+		j1939_tp_cmd_recv(priv, skb);
+		break;
+	default:
+		return 0; /* no problem */
+	}
+	return 1; /* "I processed the message" */
+}
+
+void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb)
+{
+	struct j1939_session *session;
+
+	if (!skb->sk)
+		return;
+
+	if (skb->sk->sk_family != AF_CAN ||
+	    skb->sk->sk_protocol != CAN_J1939)
+		return;
+
+	j1939_session_list_lock(priv);
+	session = j1939_session_get_simple(priv, skb);
+	j1939_session_list_unlock(priv);
+	if (!session) {
+		netdev_warn(priv->ndev,
+			    "%s: Received already invalidated message\n",
+			    __func__);
+		return;
+	}
+
+	j1939_session_timers_cancel(session);
+	j1939_session_deactivate(session);
+	j1939_session_put(session);
+}
+
+int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk)
+{
+	struct j1939_session *session, *saved;
+
+	netdev_dbg(priv->ndev, "%s, sk: %p\n", __func__, sk);
+	j1939_session_list_lock(priv);
+	list_for_each_entry_safe(session, saved,
+				 &priv->active_session_list,
+				 active_session_list_entry) {
+		if (!sk || sk == session->sk) {
+			if (hrtimer_try_to_cancel(&session->txtimer) == 1)
+				j1939_session_put(session);
+			if (hrtimer_try_to_cancel(&session->rxtimer) == 1)
+				j1939_session_put(session);
+
+			session->err = ESHUTDOWN;
+			j1939_session_deactivate_locked(session);
+		}
+	}
+	j1939_session_list_unlock(priv);
+	return NOTIFY_DONE;
+}
+
+void j1939_tp_init(struct j1939_priv *priv)
+{
+	spin_lock_init(&priv->active_session_list_lock);
+	INIT_LIST_HEAD(&priv->active_session_list);
+	priv->tp_max_packet_size = J1939_MAX_ETP_PACKET_SIZE;
+}