net/hsr/hsr_main.c

   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 <linux/rculist.h>
  10 #include <linux/timer.h>
  11 #include <linux/etherdevice.h>
  12 #include "hsr_main.h"
  13 #include "hsr_device.h"
  14 #include "hsr_netlink.h"
  15 #include "hsr_framereg.h"
  16 #include "hsr_slave.h"
  17
  18 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
  19                              void *ptr)
  20 {
  21         struct net_device *dev;
  22         struct hsr_port *port, *master;
  23         struct hsr_priv *hsr;
  24         int mtu_max;
  25         int res;
  26
  27         dev = netdev_notifier_info_to_dev(ptr);
  28         port = hsr_port_get_rtnl(dev);
  29         if (!port) {
  30                 if (!is_hsr_master(dev))
  31                         return NOTIFY_DONE;     /* Not an HSR device */
  32                 hsr = netdev_priv(dev);
  33                 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  34                 if (!port) {
  35                         /* Resend of notification concerning removed device? */
  36                         return NOTIFY_DONE;
  37                 }
  38         } else {
  39                 hsr = port->hsr;
  40         }
  41
  42         switch (event) {
  43         case NETDEV_UP:         /* Administrative state DOWN */
  44         case NETDEV_DOWN:       /* Administrative state UP */
  45         case NETDEV_CHANGE:     /* Link (carrier) state changes */
  46                 hsr_check_carrier_and_operstate(hsr);
  47                 break;
  48         case NETDEV_CHANGEADDR:
  49                 if (port->type == HSR_PT_MASTER) {
  50                         /* This should not happen since there's no
  51                          * ndo_set_mac_address() for HSR devices - i.e. not
  52                          * supported.
  53                          */
  54                         break;
  55                 }
  56
  57                 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  58
  59                 if (port->type == HSR_PT_SLAVE_A) {
  60                         ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
  61                         call_netdevice_notifiers(NETDEV_CHANGEADDR,
  62                                                  master->dev);
  63                 }
  64
  65                 /* Make sure we recognize frames from ourselves in hsr_rcv() */
  66                 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
  67                 res = hsr_create_self_node(&hsr->self_node_db,
  68                                            master->dev->dev_addr,
  69                                            port ?
  70                                                 port->dev->dev_addr :
  71                                                 master->dev->dev_addr);
  72                 if (res)
  73                         netdev_warn(master->dev,
  74                                     "Could not update HSR node address.\n");
  75                 break;
  76         case NETDEV_CHANGEMTU:
  77                 if (port->type == HSR_PT_MASTER)
  78                         break; /* Handled in ndo_change_mtu() */
  79                 mtu_max = hsr_get_max_mtu(port->hsr);
  80                 master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
  81                 master->dev->mtu = mtu_max;
  82                 break;
  83         case NETDEV_UNREGISTER:
  84                 hsr_del_port(port);
  85                 break;
  86         case NETDEV_PRE_TYPE_CHANGE:
  87                 /* HSR works only on Ethernet devices. Refuse slave to change
  88                  * its type.
  89                  */
  90                 return NOTIFY_BAD;
  91         }
  92
  93         return NOTIFY_DONE;
  94 }
  95
  96 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
  97 {
  98         struct hsr_port *port;
  99
 100         hsr_for_each_port(hsr, port)
 101                 if (port->type == pt)
 102                         return port;
 103         return NULL;
 104 }
 105
 106 static struct notifier_block hsr_nb = {
 107         .notifier_call = hsr_netdev_notify,     /* Slave event notifications */
 108 };
 109
 110 static int __init hsr_init(void)
 111 {
 112         int res;
 113
 114         BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 115
 116         register_netdevice_notifier(&hsr_nb);
 117         res = hsr_netlink_init();
 118
 119         return res;
 120 }
 121
 122 static void __exit hsr_exit(void)
 123 {
 124         unregister_netdevice_notifier(&hsr_nb);
 125         hsr_netlink_exit();
 126 }
 127
 128 module_init(hsr_init);
 129 module_exit(hsr_exit);
 130 MODULE_LICENSE("GPL");