[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>

1 files changed, 54 insertions, 0 deletions

diff --git a/fs/afs/netdevices.c b/fs/afs/netdevices.c
new file mode 100644
index 000000000000..2b3087357fa9
--- /dev/null
+++ b/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;
+}