add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/hsr/hsr_slave.c
..
..
@@ -1,12 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /* Copyright 2011-2014 Autronica Fire and Security AS
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the Free
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- * Software Foundation; either version 2 of the License, or (at your option)
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- * any later version.
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  *
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  * Author(s):
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5
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
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+ *
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+ * Frame handler other utility functions for HSR and PRP.
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  */
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9
 
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 #include "hsr_slave.h"
..
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@@ -18,22 +16,31 @@
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 #include "hsr_forward.h"
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 #include "hsr_framereg.h"
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18
 
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+bool hsr_invalid_dan_ingress_frame(__be16 protocol)
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+{
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+	return (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR));
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+}
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23
 
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 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
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 {
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 	struct sk_buff *skb = *pskb;
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 	struct hsr_port *port;
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-	u16 protocol;
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+	struct hsr_priv *hsr;
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+	__be16 protocol;
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+
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+	/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
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+	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
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+		return RX_HANDLER_PASS;
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 	if (!skb_mac_header_was_set(skb)) {
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 		WARN_ONCE(1, "%s: skb invalid", __func__);
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 		return RX_HANDLER_PASS;
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 	}
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-	rcu_read_lock(); /* hsr->node_db, hsr->ports */
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 	port = hsr_port_get_rcu(skb->dev);
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 	if (!port)
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 		goto finish_pass;
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+	hsr = port->hsr;
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 	if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
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 		/* Directly kill frames sent by ourselves */
..
..
@@ -41,20 +48,28 @@
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 		goto finish_consume;
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 	}
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50
 
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+	/* For HSR, only tagged frames are expected, but for PRP
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+	 * there could be non tagged frames as well from Single
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+	 * attached nodes (SANs).
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+	 */
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 	protocol = eth_hdr(skb)->h_proto;
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-	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
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+	if (hsr->proto_ops->invalid_dan_ingress_frame &&
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+	    hsr->proto_ops->invalid_dan_ingress_frame(protocol))
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 		goto finish_pass;
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 	skb_push(skb, ETH_HLEN);
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+	skb_reset_mac_header(skb);
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+	if ((!hsr->prot_version && protocol == htons(ETH_P_PRP)) ||
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+	    protocol == htons(ETH_P_HSR))
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+		skb_set_network_header(skb, ETH_HLEN + HSR_HLEN);
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+	skb_reset_mac_len(skb);
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 	hsr_forward_skb(skb, port);
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68
 
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 finish_consume:
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-	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
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 	return RX_HANDLER_CONSUMED;
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71
 
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 finish_pass:
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-	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
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 	return RX_HANDLER_PASS;
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 }
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75
 
..
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@@ -63,34 +78,37 @@
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 	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
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 }
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80
 
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-
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-static int hsr_check_dev_ok(struct net_device *dev)
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+static int hsr_check_dev_ok(struct net_device *dev,
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+			    struct netlink_ext_ack *extack)
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 {
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 	/* Don't allow HSR on non-ethernet like devices */
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-	if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
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-	    (dev->addr_len != ETH_ALEN)) {
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-		netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
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+	if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
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+	    dev->addr_len != ETH_ALEN) {
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+		NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave.");
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 		return -EINVAL;
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 	}
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 	/* Don't allow enslaving hsr devices */
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 	if (is_hsr_master(dev)) {
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-		netdev_info(dev, "Cannot create trees of HSR devices.\n");
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+		NL_SET_ERR_MSG_MOD(extack,
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+				   "Cannot create trees of HSR devices.");
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 		return -EINVAL;
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 	}
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 	if (hsr_port_exists(dev)) {
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-		netdev_info(dev, "This device is already a HSR slave.\n");
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+		NL_SET_ERR_MSG_MOD(extack,
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+				   "This device is already a HSR slave.");
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 		return -EINVAL;
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 	}
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 	if (is_vlan_dev(dev)) {
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-		netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
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+		NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver.");
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 		return -EINVAL;
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 	}
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 	if (dev->priv_flags & IFF_DONT_BRIDGE) {
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-		netdev_info(dev, "This device does not support bridging.\n");
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+		NL_SET_ERR_MSG_MOD(extack,
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+				   "This device does not support bridging.");
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 		return -EOPNOTSUPP;
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 	}
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114
 
..
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@@ -101,21 +119,26 @@
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 	return 0;
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 }
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-
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 /* Setup device to be added to the HSR bridge. */
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-static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
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+static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
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+			     struct hsr_port *port,
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+			     struct netlink_ext_ack *extack)
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+
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 {
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+	struct net_device *hsr_dev;
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+	struct hsr_port *master;
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 	int res;
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-	dev_hold(dev);
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 	res = dev_set_promiscuity(dev, 1);
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 	if (res)
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-		goto fail_promiscuity;
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+		return res;
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-	/* FIXME:
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-	 * What does net device "adjacency" mean? Should we do
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-	 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
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-	 */
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+	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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+	hsr_dev = master->dev;
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+
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+	res = netdev_upper_dev_link(dev, hsr_dev, extack);
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+	if (res)
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+		goto fail_upper_dev_link;
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 	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
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 	if (res)
..
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@@ -125,31 +148,30 @@
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 	return 0;
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 fail_rx_handler:
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+	netdev_upper_dev_unlink(dev, hsr_dev);
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+fail_upper_dev_link:
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 	dev_set_promiscuity(dev, -1);
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-fail_promiscuity:
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-	dev_put(dev);
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-
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 	return res;
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 }
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 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
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-		 enum hsr_port_type type)
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+		 enum hsr_port_type type, struct netlink_ext_ack *extack)
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 {
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 	struct hsr_port *port, *master;
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 	int res;
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 	if (type != HSR_PT_MASTER) {
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-		res = hsr_check_dev_ok(dev);
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+		res = hsr_check_dev_ok(dev, extack);
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 		if (res)
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 			return res;
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 	}
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 	port = hsr_port_get_hsr(hsr, type);
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-	if (port != NULL)
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+	if (port)
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 		return -EBUSY;	/* This port already exists */
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 	port = kzalloc(sizeof(*port), GFP_KERNEL);
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-	if (port == NULL)
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+	if (!port)
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 		return -ENOMEM;
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 	port->hsr = hsr;
..
..
@@ -157,7 +179,7 @@
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 	port->type = type;
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180
 
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 	if (type != HSR_PT_MASTER) {
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-		res = hsr_portdev_setup(dev, port);
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+		res = hsr_portdev_setup(hsr, dev, port, extack);
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 		if (res)
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 			goto fail_dev_setup;
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 	}
..
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@@ -186,20 +208,14 @@
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 	list_del_rcu(&port->port_list);
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209
 
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 	if (port != master) {
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-		if (master != NULL) {
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-			netdev_update_features(master->dev);
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-			dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
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-		}
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+		netdev_update_features(master->dev);
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+		dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
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 		netdev_rx_handler_unregister(port->dev);
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 		dev_set_promiscuity(port->dev, -1);
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+		netdev_upper_dev_unlink(port->dev, master->dev);
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 	}
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-
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-	/* FIXME?
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-	 * netdev_upper_dev_unlink(port->dev, port->hsr->dev);
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-	 */
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217
 
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 	synchronize_rcu();
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-	if (port != master)
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-		dev_put(port->dev);
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+	kfree(port);
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 }