[IPV4]: Enable use of 240/4 address space.

This short patch modifies the IPv4 networking to enable use of the
240.0.0.0/4 (aka "class-E") address space as propsed in the internet
draft draft-fuller-240space-00.txt.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/in.h b/include/linux/in.h
index 27d8a5ae9f75..70c6df882694 100644
--- a/include/linux/in.h
+++ b/include/linux/in.h
@@ -262,9 +262,10 @@ static inline bool ipv4_is_local_multicast(__be32 addr)
         return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
 }
 
-static inline bool ipv4_is_badclass(__be32 addr)
+static inline bool ipv4_is_lbcast(__be32 addr)
 {
-        return (addr & htonl(0xf0000000)) == htonl(0xf0000000);
+        /* limited broadcast */
+        return addr == INADDR_BROADCAST;
 }
 
 static inline bool ipv4_is_zeronet(__be32 addr)
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 8b1509bfc695..496503c03846 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -262,7 +262,7 @@ static inline int ipv6_isatap_eui64(u8 *eui, __be32 addr)
                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
-                  ipv4_is_badclass(addr)) ? 0x00 : 0x02;
+                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
         eui[1] = 0;
         eui[2] = 0x5E;
         eui[3] = 0xFE;