diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 46c9e2c..7d83f90 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -45,6 +45,7 @@
 				      struct dst_entry *dst);
 	struct inet_peer *(*get_peer)(struct sock *sk, bool *release_it);
 	u16	    net_header_len;
+	u16	    net_frag_header_len;
 	u16	    sockaddr_len;
 	int	    (*setsockopt)(struct sock *sk, int level, int optname, 
 				  char __user *optval, unsigned int optlen);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index fc880e9..0fb84de 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -544,8 +544,8 @@
 
 extern void tcp_initialize_rcv_mss(struct sock *sk);
 
-extern int tcp_mtu_to_mss(const struct sock *sk, int pmtu);
-extern int tcp_mss_to_mtu(const struct sock *sk, int mss);
+extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
+extern int tcp_mss_to_mtu(struct sock *sk, int mss);
 extern void tcp_mtup_init(struct sock *sk);
 extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt);