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authorPavel Emelyanov <xemul@parallels.com>2011-12-15 02:43:44 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-16 13:48:27 -0500
commitf65c1b534b99aef1809b893387b295963821549f (patch)
tree0718e1598b4d01c4c1817a3c663a312616f0dddd /net/core/sock_diag.c
parentaec8dc62f66199aef153d86e1f90d9c1d14696e3 (diff)
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>
Diffstat (limited to 'net/core/sock_diag.c')
-rw-r--r--net/core/sock_diag.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index cee96f36810..711bdefe775 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);