LXR linux/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 */
  20int 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        }
  45out:
  46        rtnl_unlock();
  47        return n;
  48}
  49