[PATCH] sk_reuse fixes

[Ilya Pashkovsky <ilya.pashkovsky@xxxxxxxxx>]

This fixes sk_reuse checks:
1) allow outgoing connections AND one listening socket bound to same
source port.
2) remove > 1 check of a boolean variable

http://puding.mine.nu/patches/patch-reuse-bool

--- linux/net/ipv4/tcp_ipv4.c.orig      2004-12-07 14:54:12.597084704 +0200
+++ linux/net/ipv4/tcp_ipv4.c   2004-12-08 14:47:27.792827816 +0200
@@ -50,6 +50,8 @@
  *     YOSHIFUJI Hideaki @USAGI and:   Support IPV6_V6ONLY socket option, which
  *     Alexey Kuznetsov                allow both IPv4 and IPv6 sockets to bind
  *                                     a single port at the same time.
+ *     Ilya Pashkovsky         :       fix TCP_LISTEN check on reuse
+ *                                     remove (sk_reuse > 1) check in get_port
  */
 
 #include <linux/config.h>
@@ -184,7 +186,8 @@ static inline int tcp_bind_conflict(stru
        const u32 sk_rcv_saddr = tcp_v4_rcv_saddr(sk);
        struct sock *sk2;
        struct hlist_node *node;
-       int reuse = sk->sk_reuse;
+       unsigned char reuse = sk->sk_reuse;
+       unsigned char state = sk->sk_state;
 
        sk_for_each_bound(sk2, node, &tb->owners) {
                if (sk != sk2 &&
@@ -193,7 +196,7 @@ static inline int tcp_bind_conflict(stru
                     !sk2->sk_bound_dev_if ||
                     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
                        if (!reuse || !sk2->sk_reuse ||
-                           sk2->sk_state == TCP_LISTEN) {
+                           (state == TCP_LISTEN && sk2->sk_state == 
TCP_LISTEN)) {
                                const u32 sk2_rcv_saddr = tcp_v4_rcv_saddr(sk2);
                                if (!sk2_rcv_saddr || !sk_rcv_saddr ||
                                    sk2_rcv_saddr == sk_rcv_saddr)
@@ -259,8 +262,14 @@ static int tcp_v4_get_port(struct sock *
        goto tb_not_found;
 tb_found:
        if (!hlist_empty(&tb->owners)) {
-               if (sk->sk_reuse > 1)
-                       goto success;
+
+               /* 
+                * sk_reuse is boolean
+                *
+                *if (sk->sk_reuse > 1)
+                *      goto success;
+                */
+
                if (tb->fastreuse > 0 &&
                    sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
                        goto success;