inet: protect against too small mtu values.

[mirror_ubuntu-bionic-kernel.git] / include / net / ip.h

diff --git a/include/net/ip.h b/include/net/ip.h
index b8ebee43941fc8954973395754b8dc6d8811ddb2..666d89ca4e2e259caf6e44adb03f6d08645bd715 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -644,4 +644,9 @@ extern int sysctl_icmp_msgs_burst;
 int ip_misc_proc_init(void);
 #endif
 
+static inline bool inetdev_valid_mtu(unsigned int mtu)
+{
+       return likely(mtu >= IPV4_MIN_MTU);
+}
+
 #endif /* _IP_H */