inet: protect against too small mtu values.

[linux-block.git] / include / net / ip.h

diff --git a/include/net/ip.h b/include/net/ip.h
index 02d68e346f6729ddd5fb019ff70cdad6a46983a5..5b317c9f4470a93abae9cbe8e7dfd3e919aa8851 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -760,4 +760,9 @@ int ip_misc_proc_init(void);
 int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
                                struct netlink_ext_ack *extack);
 
+static inline bool inetdev_valid_mtu(unsigned int mtu)
+{
+       return likely(mtu >= IPV4_MIN_MTU);
+}
+
 #endif /* _IP_H */