[IP_SOCKGLUE]: Remove most of the tcp specific calls

As DCCP needs to be called in the same spots.

Now we have a member in inet_sock (is_icsk), set at sock creation time from
struct inet_protosw->flags (if INET_PROTOSW_ICSK is set, like for TCP and
DCCP) to see if a struct sock instance is a inet_connection_sock for places
like the ones in ip_sockglue.c (v4 and v6) where we previously were looking if
sk_type was SOCK_STREAM, that is insufficient because we now use the same code
for DCCP, that has sk_type SOCK_DCCP.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 4f2d872..add019c 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -29,8 +29,7 @@
 #include <net/sock.h>
 #include <net/ip.h>
 #include <net/icmp.h>
-#include <net/tcp.h>
-#include <linux/tcp.h>
+#include <net/tcp_states.h>
 #include <linux/udp.h>
 #include <linux/igmp.h>
 #include <linux/netfilter.h>
@@ -427,8 +426,8 @@
 			err = ip_options_get_from_user(&opt, optval, optlen);
 			if (err)
 				break;
-			if (sk->sk_type == SOCK_STREAM) {
-				struct tcp_sock *tp = tcp_sk(sk);
+			if (inet->is_icsk) {
+				struct inet_connection_sock *icsk = inet_csk(sk);
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 				if (sk->sk_family == PF_INET ||
 				    (!((1 << sk->sk_state) &
@@ -436,10 +435,10 @@
 				     inet->daddr != LOOPBACK4_IPV6)) {
 #endif
 					if (inet->opt)
-						tp->ext_header_len -= inet->opt->optlen;
+						icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 					if (opt)
-						tp->ext_header_len += opt->optlen;
-					tcp_sync_mss(sk, tp->pmtu_cookie);
+						icsk->icsk_ext_hdr_len += opt->optlen;
+					icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 				}
 #endif