Index: /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_input.c
===================================================================
--- /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_input.c	(revision 38400)
+++ /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_input.c	(working copy)
@@ -15088,9 +15088,12 @@
 				int mtu = ifp->if_mtu;
 				ip = mtod(m, struct ip *);
 				struct mbuf *mp = NULL;
-				if (ip->ip_p == IPPROTO_UDP && ntohs(ip->ip_len) > mtu) {
-					/*hardware checksum may work abormal for UDP if IP fragment happened*/
-					clickudp_udp_cksum_sw(m, ifp);
+                                if ((ip->ip_p == IPPROTO_UDP || ip->ip_p == IPPROTO_TCP) && ntohs(ip->ip_len) > mtu) {
+                                        /*hardware checksum may work abormal for UDP if IP fragment happened*/
+                                        if ( ip->ip_p == IPPROTO_UDP )
+                                            clickudp_udp_cksum_sw(m, ifp);
+                                        else if ( ip->ip_p == IPPROTO_TCP )
+                                            clicktcp_tcp_cksum_sw(m, ifp);
 
 					/*enable IP fragment*/
 					ip->ip_off = 0;
Index: /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_var.h
===================================================================
--- /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_var.h	(revision 38400)
+++ /branches/rel_apv_10_4_0_112_india/usr/src/sys/click/netinet/click_var.h	(working copy)
@@ -1671,6 +1671,20 @@
                                CLICK_HASH_NOINSERT, NULL, NULL, 1);
 }
 
+static __inline void
+clicktcp_tcp_cksum_sw(struct mbuf *mp, struct ifnet *ifp)
+{
+    struct ip *ip = mtod(mp, struct ip *);
+    struct tcphdr *tcp = (struct tcphdr *)((caddr_t)ip + sizeof(struct ip));
+    int totalsize = ntohs(ip->ip_len);
+    int iphl = (ip->ip_hl) << 2;       /* IP header length */
+
+    tcp->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
+                             htons(totalsize - iphl + IPPROTO_TCP));
+    mp->m_pkthdr.csum_flags &= ~CSUM_TCP;
+    tcp->th_sum = in_cksum_skip(mp, totalsize, iphl);
+}
+
 /*
  * Given a packet header mbuf containing TCP/IP headers (in network
  * byte order) and data, calculate TCP/IP checksums or defer it to