[AFS]: Replace rtnetlink client by direct dev_base walking

Replace the large and complicated rtnetlink client by two simple
functions for getting the MAC address for the first ethernet device
and building a list of IPv4 addresses.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/afs/Makefile

@@ -18,7 +18,7 @@ kafs-objs := \
 	security.o \
 	server.o \
 	super.o \
-	use-rtnetlink.o \
+	netdevices.o \
 	vlclient.o \
 	vlocation.o \
 	vnode.o \

fs/afs/internal.h

@@ -349,7 +349,6 @@ struct afs_permits {
  * record of one of a system's set of network interfaces
  */
 struct afs_interface {
-	unsigned	index;		/* interface index */
 	struct in_addr	address;	/* IPv4 address bound to interface */
 	struct in_addr	netmask;	/* netmask applied to address */
 	unsigned	mtu;		/* MTU of interface */

fs/afs/netdevices.c

@@ -0,0 +1,54 @@
+/* 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"
+
+int afs_get_MAC_address(u8 mac[ETH_ALEN])
+{
+	struct net_device *dev;
+	int ret = -ENODEV;
+
+	rtnl_lock();
+	dev = __dev_getfirstbyhwtype(ARPHRD_ETHER);
+	if (dev) {
+		memcpy(mac, dev->dev_addr, ETH_ALEN);
+		ret = 0;
+	}
+	rtnl_unlock();
+	return ret;
+}
+
+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;
+
+	rtnl_lock();
+	for (dev = dev_base; dev; dev = dev->next) {
+		if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
+			continue;
+		idev = __in_dev_get_rtnl(dev);
+		if (!idev)
+			continue;
+		for_primary_ifa(idev) {
+			if (n == maxbufs)
+				goto out;
+			bufs[n].address.s_addr = ifa->ifa_address;
+			bufs[n].netmask.s_addr = ifa->ifa_mask;
+			bufs[n].mtu = dev->mtu;
+			n++;
+		} endfor_ifa(idev)
+	}
+out:
+	rtnl_unlock();
+	return n;
+}