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 * Event handling for HSR and PRP devices.
   8 */
   9
  10#include <linux/netdevice.h>
  11#include <net/rtnetlink.h>
  12#include <linux/rculist.h>
  13#include <linux/timer.h>
  14#include <linux/etherdevice.h>
  15#include "hsr_main.h"
  16#include "hsr_device.h"
  17#include "hsr_netlink.h"
  18#include "hsr_framereg.h"
  19#include "hsr_slave.h"
  20
  21static bool hsr_slave_empty(struct hsr_priv *hsr)
  22{
  23        struct hsr_port *port;
  24
  25        hsr_for_each_port(hsr, port)
  26                if (port->type != HSR_PT_MASTER)
  27                        return false;
  28        return true;
  29}
  30
  31static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
  32                             void *ptr)
  33{
  34        struct hsr_port *port, *master;
  35        struct net_device *dev;
  36        struct hsr_priv *hsr;
  37        LIST_HEAD(list_kill);
  38        int mtu_max;
  39        int res;
  40
  41        dev = netdev_notifier_info_to_dev(ptr);
  42        port = hsr_port_get_rtnl(dev);
  43        if (!port) {
  44                if (!is_hsr_master(dev))
  45                        return NOTIFY_DONE;     /* Not an HSR device */
  46                hsr = netdev_priv(dev);
  47                port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  48                if (!port) {
  49                        /* Resend of notification concerning removed device? */
  50                        return NOTIFY_DONE;
  51                }
  52        } else {
  53                hsr = port->hsr;
  54        }
  55
  56        switch (event) {
  57        case NETDEV_UP:         /* Administrative state DOWN */
  58        case NETDEV_DOWN:       /* Administrative state UP */
  59        case NETDEV_CHANGE:     /* Link (carrier) state changes */
  60                hsr_check_carrier_and_operstate(hsr);
  61                break;
  62        case NETDEV_CHANGENAME:
  63                if (is_hsr_master(dev))
  64                        hsr_debugfs_rename(dev);
  65                break;
  66        case NETDEV_CHANGEADDR:
  67                if (port->type == HSR_PT_MASTER) {
  68                        /* This should not happen since there's no
  69                         * ndo_set_mac_address() for HSR devices - i.e. not
  70                         * supported.
  71                         */
  72                        break;
  73                }
  74
  75                master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  76
  77                if (port->type == HSR_PT_SLAVE_A) {
  78                        ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
  79                        call_netdevice_notifiers(NETDEV_CHANGEADDR,
  80                                                 master->dev);
  81                }
  82
  83                /* Make sure we recognize frames from ourselves in hsr_rcv() */
  84                port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
  85                res = hsr_create_self_node(hsr,
  86                                           master->dev->dev_addr,
  87                                           port ?
  88                                                port->dev->dev_addr :
  89                                                master->dev->dev_addr);
  90                if (res)
  91                        netdev_warn(master->dev,
  92                                    "Could not update HSR node address.\n");
  93                break;
  94        case NETDEV_CHANGEMTU:
  95                if (port->type == HSR_PT_MASTER)
  96                        break; /* Handled in ndo_change_mtu() */
  97                mtu_max = hsr_get_max_mtu(port->hsr);
  98                master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
  99                master->dev->mtu = mtu_max;
 100                break;
 101        case NETDEV_UNREGISTER:
 102                if (!is_hsr_master(dev)) {
 103                        master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
 104                        hsr_del_port(port);
 105                        if (hsr_slave_empty(master->hsr)) {
 106                                const struct rtnl_link_ops *ops;
 107
 108                                ops = master->dev->rtnl_link_ops;
 109                                ops->dellink(master->dev, &list_kill);
 110                                unregister_netdevice_many(&list_kill);
 111                        }
 112                }
 113                break;
 114        case NETDEV_PRE_TYPE_CHANGE:
 115                /* HSR works only on Ethernet devices. Refuse slave to change
 116                 * its type.
 117                 */
 118                return NOTIFY_BAD;
 119        }
 120
 121        return NOTIFY_DONE;
 122}
 123
 124struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
 125{
 126        struct hsr_port *port;
 127
 128        hsr_for_each_port(hsr, port)
 129                if (port->type == pt)
 130                        return port;
 131        return NULL;
 132}
 133
 134int hsr_get_version(struct net_device *dev, enum hsr_version *ver)
 135{
 136        struct hsr_priv *hsr;
 137
 138        hsr = netdev_priv(dev);
 139        *ver = hsr->prot_version;
 140
 141        return 0;
 142}
 143EXPORT_SYMBOL(hsr_get_version);
 144
 145static struct notifier_block hsr_nb = {
 146        .notifier_call = hsr_netdev_notify,     /* Slave event notifications */
 147};
 148
 149static int __init hsr_init(void)
 150{
 151        int res;
 152
 153        BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 154
 155        register_netdevice_notifier(&hsr_nb);
 156        res = hsr_netlink_init();
 157
 158        return res;
 159}
 160
 161static void __exit hsr_exit(void)
 162{
 163        hsr_netlink_exit();
 164        hsr_debugfs_remove_root();
 165        unregister_netdevice_notifier(&hsr_nb);
 166}
 167
 168module_init(hsr_init);
 169module_exit(hsr_exit);
 170MODULE_LICENSE("GPL");
 171