LXR linux/net/hsr/hsr

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright 2011-2014 Autronica Fire and Security AS
   3 *
   4 * Author(s):
   5 *      2011-2014 Arvid Brodin, arvid.brodin@alten.se
   6 */
   7
   8#include <linux/netdevice.h>
   9#include <net/rtnetlink.h>
  10#include <linux/rculist.h>
  11#include <linux/timer.h>
  12#include <linux/etherdevice.h>
  13#include "hsr_main.h"
  14#include "hsr_device.h"
  15#include "hsr_netlink.h"
  16#include "hsr_framereg.h"
  17#include "hsr_slave.h"
  18
  19static bool hsr_slave_empty(struct hsr_priv *hsr)
  20{
  21        struct hsr_port *port;
  22
  23        hsr_for_each_port(hsr, port)
  24                if (port->type != HSR_PT_MASTER)
  25                        return false;
  26        return true;
  27}
  28
  29static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
  30                             void *ptr)
  31{
  32        struct hsr_port *port, *master;
  33        struct net_device *dev;
  34        struct hsr_priv *hsr;
  35        LIST_HEAD(list_kill);
  36        int mtu_max;
  37        int res;
  38
  39        dev = netdev_notifier_info_to_dev(ptr);
  40        port = hsr_port_get_rtnl(dev);
  41        if (!port) {
  42                if (!is_hsr_master(dev))
  43                        return NOTIFY_DONE;     /* Not an HSR device */
  44                hsr = netdev_priv(dev);
  45                port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  46                if (!port) {
  47                        /* Resend of notification concerning removed device? */
  48                        return NOTIFY_DONE;
  49                }
  50        } else {
  51                hsr = port->hsr;
  52        }
  53
  54        switch (event) {
  55        case NETDEV_UP:         /* Administrative state DOWN */
  56        case NETDEV_DOWN:       /* Administrative state UP */
  57        case NETDEV_CHANGE:     /* Link (carrier) state changes */
  58                hsr_check_carrier_and_operstate(hsr);
  59                break;
  60        case NETDEV_CHANGENAME:
  61                if (is_hsr_master(dev))
  62                        hsr_debugfs_rename(dev);
  63                break;
  64        case NETDEV_CHANGEADDR:
  65                if (port->type == HSR_PT_MASTER) {
  66                        /* This should not happen since there's no
  67                         * ndo_set_mac_address() for HSR devices - i.e. not
  68                         * supported.
  69                         */
  70                        break;
  71                }
  72
  73                master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  74
  75                if (port->type == HSR_PT_SLAVE_A) {
  76                        ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
  77                        call_netdevice_notifiers(NETDEV_CHANGEADDR,
  78                                                 master->dev);
  79                }
  80
  81                /* Make sure we recognize frames from ourselves in hsr_rcv() */
  82                port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
  83                res = hsr_create_self_node(hsr,
  84                                           master->dev->dev_addr,
  85                                           port ?
  86                                                port->dev->dev_addr :
  87                                                master->dev->dev_addr);
  88                if (res)
  89                        netdev_warn(master->dev,
  90                                    "Could not update HSR node address.\n");
  91                break;
  92        case NETDEV_CHANGEMTU:
  93                if (port->type == HSR_PT_MASTER)
  94                        break; /* Handled in ndo_change_mtu() */
  95                mtu_max = hsr_get_max_mtu(port->hsr);
  96                master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
  97                master->dev->mtu = mtu_max;
  98                break;
  99        case NETDEV_UNREGISTER:
 100                if (!is_hsr_master(dev)) {
 101                        master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
 102                        hsr_del_port(port);
 103                        if (hsr_slave_empty(master->hsr)) {
 104                                const struct rtnl_link_ops *ops;
 105
 106                                ops = master->dev->rtnl_link_ops;
 107                                ops->dellink(master->dev, &list_kill);
 108                                unregister_netdevice_many(&list_kill);
 109                        }
 110                }
 111                break;
 112        case NETDEV_PRE_TYPE_CHANGE:
 113                /* HSR works only on Ethernet devices. Refuse slave to change
 114                 * its type.
 115                 */
 116                return NOTIFY_BAD;
 117        }
 118
 119        return NOTIFY_DONE;
 120}
 121
 122struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
 123{
 124        struct hsr_port *port;
 125
 126        hsr_for_each_port(hsr, port)
 127                if (port->type == pt)
 128                        return port;
 129        return NULL;
 130}
 131
 132static struct notifier_block hsr_nb = {
 133        .notifier_call = hsr_netdev_notify,     /* Slave event notifications */
 134};
 135
 136static int __init hsr_init(void)
 137{
 138        int res;
 139
 140        BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 141
 142        register_netdevice_notifier(&hsr_nb);
 143        res = hsr_netlink_init();
 144
 145        return res;
 146}
 147
 148static void __exit hsr_exit(void)
 149{
 150        hsr_netlink_exit();
 151        hsr_debugfs_remove_root();
 152        unregister_netdevice_notifier(&hsr_nb);
 153}
 154
 155module_init(hsr_init);
 156module_exit(hsr_exit);
 157MODULE_LICENSE("GPL");
 158