[ARP]: Minus one level of indentation in arp_req_set

The ATF_PUBL requests are handled completely separate from
the others. Emphasize it with a separate function. This also
reduces the indentation level.

The same issue exists with the arp_delete_request, but
when I tried to make it in one patch diff produced completely
unreadable patch. So I split it into two, but they may be
done with one commit.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 33 insertions, 25 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 54a76b8b803..04e0ecdd07b 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -952,37 +952,45 @@ out_of_mem:
  *      Set (create) an ARP cache entry.
  */
 
+static int arp_req_set_public(struct arpreq *r, struct net_device *dev)
+{
+        __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
+        __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr;
+
+        if (mask && mask != htonl(0xFFFFFFFF))
+                return -EINVAL;
+        if (!dev && (r->arp_flags & ATF_COM)) {
+                dev = dev_getbyhwaddr(&init_net, r->arp_ha.sa_family,
+                                r->arp_ha.sa_data);
+                if (!dev)
+                        return -ENODEV;
+        }
+        if (mask) {
+                if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL)
+                        return -ENOBUFS;
+                return 0;
+        }
+        if (dev == NULL) {
+                IPV4_DEVCONF_ALL(PROXY_ARP) = 1;
+                return 0;
+        }
+        if (__in_dev_get_rtnl(dev)) {
+                IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, 1);
+                return 0;
+        }
+        return -ENXIO;
+}
+
 static int arp_req_set(struct arpreq *r, struct net_device * dev)
 {
-        __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
+        __be32 ip;
         struct neighbour *neigh;
         int err;
 
-        if (r->arp_flags&ATF_PUBL) {
-                __be32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
-                if (mask && mask != htonl(0xFFFFFFFF))
-                        return -EINVAL;
-                if (!dev && (r->arp_flags & ATF_COM)) {
-                        dev = dev_getbyhwaddr(&init_net, r->arp_ha.sa_family, r->arp_ha.sa_data);
-                        if (!dev)
-                                return -ENODEV;
-                }
-                if (mask) {
-                        if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL)
-                                return -ENOBUFS;
-                        return 0;
-                }
-                if (dev == NULL) {
-                        IPV4_DEVCONF_ALL(PROXY_ARP) = 1;
-                        return 0;
-                }
-                if (__in_dev_get_rtnl(dev)) {
-                        IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, 1);
-                        return 0;
-                }
-                return -ENXIO;
-        }
+        if (r->arp_flags & ATF_PUBL)
+                return arp_req_set_public(r, dev);
 
+        ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
         if (r->arp_flags & ATF_PERM)
                 r->arp_flags |= ATF_COM;
         if (dev == NULL) {