1 files changed, 68 insertions, 0 deletions

diff --git a/fs/afs/netdevices.c b/fs/afs/netdevices.c
new file mode 100644
index 000000000000..fc27d4b52e5f
--- /dev/null
+++ b/fs/afs/netdevices.c
@@ -0,0 +1,68 @@
+/* AFS network device helpers
+ *
+ * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
+ */
+
+#include <linux/string.h>
+#include <linux/rtnetlink.h>
+#include <linux/inetdevice.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include "internal.h"
+
+/*
+ * get a MAC address from a random ethernet interface that has a real one
+ * - the buffer will normally be 6 bytes in size
+ */
+int afs_get_MAC_address(u8 *mac, size_t maclen)
+{
+        struct net_device *dev;
+        int ret = -ENODEV;
+
+        if (maclen != ETH_ALEN)
+                BUG();
+
+        rtnl_lock();
+        dev = __dev_getfirstbyhwtype(ARPHRD_ETHER);
+        if (dev) {
+                memcpy(mac, dev->dev_addr, maclen);
+                ret = 0;
+        }
+        rtnl_unlock();
+        return ret;
+}
+
+/*
+ * get a list of this system's interface IPv4 addresses, netmasks and MTUs
+ * - maxbufs must be at least 1
+ * - returns the number of interface records in the buffer
+ */
+int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
+                            bool wantloopback)
+{
+        struct net_device *dev;
+        struct in_device *idev;
+        int n = 0;
+
+        ASSERT(maxbufs > 0);
+
+        rtnl_lock();
+        for_each_netdev(dev) {
+                if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
+                        continue;
+                idev = __in_dev_get_rtnl(dev);
+                if (!idev)
+                        continue;
+                for_primary_ifa(idev) {
+                        bufs[n].address.s_addr = ifa->ifa_address;
+                        bufs[n].netmask.s_addr = ifa->ifa_mask;
+                        bufs[n].mtu = dev->mtu;
+                        n++;
+                        if (n >= maxbufs)
+                                goto out;
+                } endfor_ifa(idev);
+        }
+out:
+        rtnl_unlock();
+        return n;
+}