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>

3 files changed, 24 insertions, 20 deletions

diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index cee96f368108..711bdefe7753 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -12,6 +12,25 @@ static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
 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);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index fa27313765f3..fb2e47ff59f7 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -102,8 +102,7 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
         r->idiag_retrans = 0;
 
         r->id.idiag_if = sk->sk_bound_dev_if;
-        r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
-        r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
+        sock_diag_save_cookie(sk, r->id.idiag_cookie);
 
         r->id.idiag_sport = inet->inet_sport;
         r->id.idiag_dport = inet->inet_dport;
@@ -221,8 +220,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
         r->idiag_family       = tw->tw_family;
         r->idiag_retrans      = 0;
         r->id.idiag_if        = tw->tw_bound_dev_if;
-        r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
-        r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
+        sock_diag_save_cookie(tw, r->id.idiag_cookie);
         r->id.idiag_sport     = tw->tw_sport;
         r->id.idiag_dport     = tw->tw_dport;
         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
@@ -261,18 +259,6 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
         return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
 }
 
-int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
-{
-        if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
-             req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
-            ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
-             (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
-                return -ESTALE;
-        else
-                return 0;
-}
-EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
-
 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
                 const struct nlmsghdr *nlh, struct inet_diag_req *req)
 {
@@ -304,7 +290,7 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_s
         if (sk == NULL)
                 goto out_nosk;
 
-        err = inet_diag_check_cookie(sk, req);
+        err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
         if (err)
                 goto out;
 
@@ -617,8 +603,7 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
         r->idiag_retrans = req->retrans;
 
         r->id.idiag_if = sk->sk_bound_dev_if;
-        r->id.idiag_cookie[0] = (u32)(unsigned long)req;
-        r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
+        sock_diag_save_cookie(req, r->id.idiag_cookie);
 
         tmo = req->expires - jiffies;
         if (tmo < 0)
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index fe9db8675acb..69f8a7ca63dd 100644
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -57,7 +57,7 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
         if (sk == NULL)
                 goto out_nosk;
 
-        err = inet_diag_check_cookie(sk, req);
+        err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
         if (err)
                 goto out;