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619afef01f
hsr_del_port() should release all the resources allocated in hsr_add_port(). As a consequence of this change, hsr_for_each_port() is no longer safe to work with hsr_del_port(), switch to list_for_each_entry_safe() as we always hold RTNL lock. Cc: Arvid Brodin <arvid.brodin@alten.se> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
198 lines
4.2 KiB
C
198 lines
4.2 KiB
C
// 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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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*/
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#include "hsr_slave.h"
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include "hsr_main.h"
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#include "hsr_device.h"
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#include "hsr_forward.h"
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#include "hsr_framereg.h"
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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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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 (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
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/* Directly kill frames sent by ourselves */
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kfree_skb(skb);
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goto finish_consume;
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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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goto finish_pass;
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skb_push(skb, ETH_HLEN);
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hsr_forward_skb(skb, port);
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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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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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bool hsr_port_exists(const struct net_device *dev)
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{
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return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
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}
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static int hsr_check_dev_ok(struct net_device *dev)
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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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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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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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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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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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return -EOPNOTSUPP;
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}
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/* HSR over bonded devices has not been tested, but I'm not sure it
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* won't work...
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*/
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return 0;
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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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{
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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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/* 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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res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
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if (res)
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goto fail_rx_handler;
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dev_disable_lro(dev);
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return 0;
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fail_rx_handler:
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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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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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{
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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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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)
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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)
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return -ENOMEM;
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if (type != HSR_PT_MASTER) {
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res = hsr_portdev_setup(dev, port);
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if (res)
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goto fail_dev_setup;
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}
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port->hsr = hsr;
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port->dev = dev;
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port->type = type;
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list_add_tail_rcu(&port->port_list, &hsr->ports);
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synchronize_rcu();
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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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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return 0;
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fail_dev_setup:
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kfree(port);
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return res;
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}
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void hsr_del_port(struct hsr_port *port)
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{
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struct hsr_priv *hsr;
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struct hsr_port *master;
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hsr = port->hsr;
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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list_del_rcu(&port->port_list);
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if (port != master) {
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if (master) {
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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_rx_handler_unregister(port->dev);
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dev_set_promiscuity(port->dev, -1);
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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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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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}
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