fs/afs/netdevices.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* AFS network device helpers
   3  *
   4  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   5  */
   6
   7 #include <linux/string.h>
   8 #include <linux/rtnetlink.h>
   9 #include <linux/inetdevice.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <net/net_namespace.h>
  13 #include "internal.h"
  14
  15 /*
  16  * get a list of this system's interface IPv4 addresses, netmasks and MTUs
  17  * - maxbufs must be at least 1
  18  * - returns the number of interface records in the buffer
  19  */
  20 int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
  21                             bool wantloopback)
  22 {
  23         struct net_device *dev;
  24         struct in_device *idev;
  25         int n = 0;
  26
  27         ASSERT(maxbufs > 0);
  28
  29         rtnl_lock();
  30         for_each_netdev(&init_net, dev) {
  31                 if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
  32                         continue;
  33                 idev = __in_dev_get_rtnl(dev);
  34                 if (!idev)
  35                         continue;
  36                 for_primary_ifa(idev) {
  37                         bufs[n].address.s_addr = ifa->ifa_address;
  38                         bufs[n].netmask.s_addr = ifa->ifa_mask;
  39                         bufs[n].mtu = dev->mtu;
  40                         n++;
  41                         if (n >= maxbufs)
  42                                 goto out;
  43                 } endfor_ifa(idev);
  44         }
  45 out:
  46         rtnl_unlock();
  47         return n;
  48 }