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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}