1 files changed, 68 insertions, 0 deletions
diff --git a/fs/afs/netdevices.c b/fs/afs/netdevices.c
new file mode 100644
index 00000000..7ad36506
--- /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 <net/net_namespace.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;
+
+	BUG_ON(maclen != ETH_ALEN);
+
+	rtnl_lock();
+	dev = __dev_getfirstbyhwtype(&init_net, 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(&init_net, 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;
+}