sock_diag: Generalize requests cookies managements
The sk address is used as a cookie between dump/get_exact calls.
It will be required for unix socket sdumping, so move it from
inet_diag to sock_diag.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index cee96f3..711bdef 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -12,6 +12,25 @@
static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
static DEFINE_MUTEX(sock_diag_table_mutex);
+int sock_diag_check_cookie(void *sk, __u32 *cookie)
+{
+ if ((cookie[0] != INET_DIAG_NOCOOKIE ||
+ cookie[1] != INET_DIAG_NOCOOKIE) &&
+ ((u32)(unsigned long)sk != cookie[0] ||
+ (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
+ return -ESTALE;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
+
+void sock_diag_save_cookie(void *sk, __u32 *cookie)
+{
+ cookie[0] = (u32)(unsigned long)sk;
+ cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
+}
+EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
+
void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
{
mutex_lock(&sock_diag_table_mutex);