diff -Nur linux-2.6.25/include/net/inet_sock.h linux-2.6.25-zph/include/net/inet_sock.h
--- linux-2.6.25/include/net/inet_sock.h	2008-04-16 21:49:44.000000000 -0500
+++ linux-2.6.25-zph/include/net/inet_sock.h	2008-04-23 10:14:10.000000000 -0500
@@ -142,6 +142,7 @@
 		__be32			addr;
 		struct flowi		fl;
 	} cork;
+	__u8                    zph_tos;        /* ZPH TOS received on connect */ 
 };
 
 #define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
diff -Nur linux-2.6.25/net/ipv4/ip_sockglue.c linux-2.6.25-zph/net/ipv4/ip_sockglue.c
--- linux-2.6.25/net/ipv4/ip_sockglue.c	2008-04-16 21:49:44.000000000 -0500
+++ linux-2.6.25-zph/net/ipv4/ip_sockglue.c	2008-04-23 10:15:17.000000000 -0500
@@ -1120,6 +1120,10 @@
 			int hlim = inet->mc_ttl;
 			put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
 		}
+		if (inet->cmsg_flags&IP_CMSG_TOS) {
+                	int hlim = inet->zph_tos;
+                	put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(hlim), &hlim);
+                }
 		len -= msg.msg_controllen;
 		return put_user(len, optlen);
 	}
diff -Nur linux-2.6.25/net/ipv4/tcp_input.c linux-2.6.25-zph/net/ipv4/tcp_input.c
--- linux-2.6.25/net/ipv4/tcp_input.c	2008-04-16 21:49:44.000000000 -0500
+++ linux-2.6.25-zph/net/ipv4/tcp_input.c	2008-04-23 10:16:35.000000000 -0500
@@ -4883,6 +4883,8 @@
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct inet_sock *inet = inet_sk(sk);
+	struct iphdr *iph = ip_hdr(skb);
 	int saved_clamp = tp->rx_opt.mss_clamp;
 
 	tcp_parse_options(skb, &tp->rx_opt, 0);
@@ -4941,6 +4943,12 @@
 
 		TCP_ECN_rcv_synack(tp, th);
 
+		/* ZPH:
+		 * Copy TOS field from the SYNACK packet to zph_tos field
+		 * of the af_inet member of sock structure
+		 */
+		inet->zph_tos = iph->tos;
+
 		tp->snd_wl1 = TCP_SKB_CB(skb)->seq;
 		tcp_ack(sk, skb, FLAG_SLOWPATH);