1/* AFS network device helpers 2 * 3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 4 */ 5 6#include <linux/string.h> 7#include <linux/rtnetlink.h> 8#include <linux/inetdevice.h> 9#include <linux/netdevice.h> 10#include <linux/if_arp.h> 11#include <net/net_namespace.h> 12#include "internal.h" 13 14/* 15 * get a MAC address from a random ethernet interface that has a real one 16 * - the buffer will normally be 6 bytes in size 17 */ 18int afs_get_MAC_address(u8 *mac, size_t maclen) 19{ 20 struct net_device *dev; 21 int ret = -ENODEV; 22 23 BUG_ON(maclen != ETH_ALEN); 24 25 rtnl_lock(); 26 dev = __dev_getfirstbyhwtype(&init_net, ARPHRD_ETHER); 27 if (dev) { 28 memcpy(mac, dev->dev_addr, maclen); 29 ret = 0; 30 } 31 rtnl_unlock(); 32 return ret; 33} 34 35/* 36 * get a list of this system's interface IPv4 addresses, netmasks and MTUs 37 * - maxbufs must be at least 1 38 * - returns the number of interface records in the buffer 39 */ 40int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs, 41 bool wantloopback) 42{ 43 struct net_device *dev; 44 struct in_device *idev; 45 int n = 0; 46 47 ASSERT(maxbufs > 0); 48 49 rtnl_lock(); 50 for_each_netdev(&init_net, dev) { 51 if (dev->type == ARPHRD_LOOPBACK && !wantloopback) 52 continue; 53 idev = __in_dev_get_rtnl(dev); 54 if (!idev) 55 continue; 56 for_primary_ifa(idev) { 57 bufs[n].address.s_addr = ifa->ifa_address; 58 bufs[n].netmask.s_addr = ifa->ifa_mask; 59 bufs[n].mtu = dev->mtu; 60 n++; 61 if (n >= maxbufs) 62 goto out; 63 } endfor_ifa(idev); 64 } 65out: 66 rtnl_unlock(); 67 return n; 68} 69