| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright 2011-2014 Autronica Fire and Security AS |
| * |
| * Author(s): |
| * 2011-2014 Arvid Brodin, arvid.brodin@alten.se |
| */ |
| |
| #include "hsr_slave.h" |
| #include <linux/etherdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_vlan.h> |
| #include "hsr_main.h" |
| #include "hsr_device.h" |
| #include "hsr_forward.h" |
| #include "hsr_framereg.h" |
| |
| static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb) |
| { |
| struct sk_buff *skb = *pskb; |
| struct hsr_port *port; |
| u16 protocol; |
| |
| if (!skb_mac_header_was_set(skb)) { |
| WARN_ONCE(1, "%s: skb invalid", __func__); |
| return RX_HANDLER_PASS; |
| } |
| |
| rcu_read_lock(); /* hsr->node_db, hsr->ports */ |
| port = hsr_port_get_rcu(skb->dev); |
| if (!port) |
| goto finish_pass; |
| |
| if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) { |
| /* Directly kill frames sent by ourselves */ |
| kfree_skb(skb); |
| goto finish_consume; |
| } |
| |
| protocol = eth_hdr(skb)->h_proto; |
| if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) |
| goto finish_pass; |
| |
| skb_push(skb, ETH_HLEN); |
| |
| hsr_forward_skb(skb, port); |
| |
| finish_consume: |
| rcu_read_unlock(); /* hsr->node_db, hsr->ports */ |
| return RX_HANDLER_CONSUMED; |
| |
| finish_pass: |
| rcu_read_unlock(); /* hsr->node_db, hsr->ports */ |
| return RX_HANDLER_PASS; |
| } |
| |
| bool hsr_port_exists(const struct net_device *dev) |
| { |
| return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; |
| } |
| |
| static int hsr_check_dev_ok(struct net_device *dev) |
| { |
| /* Don't allow HSR on non-ethernet like devices */ |
| if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER || |
| dev->addr_len != ETH_ALEN) { |
| netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); |
| return -EINVAL; |
| } |
| |
| /* Don't allow enslaving hsr devices */ |
| if (is_hsr_master(dev)) { |
| netdev_info(dev, "Cannot create trees of HSR devices.\n"); |
| return -EINVAL; |
| } |
| |
| if (hsr_port_exists(dev)) { |
| netdev_info(dev, "This device is already a HSR slave.\n"); |
| return -EINVAL; |
| } |
| |
| if (is_vlan_dev(dev)) { |
| netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); |
| return -EINVAL; |
| } |
| |
| if (dev->priv_flags & IFF_DONT_BRIDGE) { |
| netdev_info(dev, "This device does not support bridging.\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| /* HSR over bonded devices has not been tested, but I'm not sure it |
| * won't work... |
| */ |
| |
| return 0; |
| } |
| |
| /* Setup device to be added to the HSR bridge. */ |
| static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port) |
| { |
| int res; |
| |
| dev_hold(dev); |
| res = dev_set_promiscuity(dev, 1); |
| if (res) |
| goto fail_promiscuity; |
| |
| /* FIXME: |
| * What does net device "adjacency" mean? Should we do |
| * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ? |
| */ |
| |
| res = netdev_rx_handler_register(dev, hsr_handle_frame, port); |
| if (res) |
| goto fail_rx_handler; |
| dev_disable_lro(dev); |
| |
| return 0; |
| |
| fail_rx_handler: |
| dev_set_promiscuity(dev, -1); |
| fail_promiscuity: |
| dev_put(dev); |
| |
| return res; |
| } |
| |
| int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev, |
| enum hsr_port_type type) |
| { |
| struct hsr_port *port, *master; |
| int res; |
| |
| if (type != HSR_PT_MASTER) { |
| res = hsr_check_dev_ok(dev); |
| if (res) |
| return res; |
| } |
| |
| port = hsr_port_get_hsr(hsr, type); |
| if (port) |
| return -EBUSY; /* This port already exists */ |
| |
| port = kzalloc(sizeof(*port), GFP_KERNEL); |
| if (!port) |
| return -ENOMEM; |
| |
| if (type != HSR_PT_MASTER) { |
| res = hsr_portdev_setup(dev, port); |
| if (res) |
| goto fail_dev_setup; |
| } |
| |
| port->hsr = hsr; |
| port->dev = dev; |
| port->type = type; |
| |
| list_add_tail_rcu(&port->port_list, &hsr->ports); |
| synchronize_rcu(); |
| |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| netdev_update_features(master->dev); |
| dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); |
| |
| return 0; |
| |
| fail_dev_setup: |
| kfree(port); |
| return res; |
| } |
| |
| void hsr_del_port(struct hsr_port *port) |
| { |
| struct hsr_priv *hsr; |
| struct hsr_port *master; |
| |
| hsr = port->hsr; |
| master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
| list_del_rcu(&port->port_list); |
| |
| if (port != master) { |
| if (master) { |
| netdev_update_features(master->dev); |
| dev_set_mtu(master->dev, hsr_get_max_mtu(hsr)); |
| } |
| netdev_rx_handler_unregister(port->dev); |
| dev_set_promiscuity(port->dev, -1); |
| } |
| |
| /* FIXME? |
| * netdev_upper_dev_unlink(port->dev, port->hsr->dev); |
| */ |
| |
| synchronize_rcu(); |
| |
| if (port != master) |
| dev_put(port->dev); |
| kfree(port); |
| } |