1 files changed, 71 insertions, 0 deletions

diff --git a/include/net/scm.h b/include/net/scm.h
new file mode 100644
index 000000000000..c3fa3d5ab606
--- /dev/null
+++ b/include/net/scm.h
@@ -0,0 +1,71 @@
+#ifndef __LINUX_NET_SCM_H
+#define __LINUX_NET_SCM_H
+
+#include <linux/limits.h>
+#include <linux/net.h>
+
+/* Well, we should have at least one descriptor open
+ * to accept passed FDs 8)
+ */
+#define SCM_MAX_FD      (OPEN_MAX-1)
+
+struct scm_fp_list
+{
+        int             count;
+        struct file     *fp[SCM_MAX_FD];
+};
+
+struct scm_cookie
+{
+        struct ucred            creds;          /* Skb credentials      */
+        struct scm_fp_list      *fp;            /* Passed files         */
+        unsigned long           seq;            /* Connection seqno     */
+};
+
+extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
+extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
+extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
+extern void __scm_destroy(struct scm_cookie *scm);
+extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
+
+static __inline__ void scm_destroy(struct scm_cookie *scm)
+{
+        if (scm && scm->fp)
+                __scm_destroy(scm);
+}
+
+static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
+                               struct scm_cookie *scm)
+{
+        memset(scm, 0, sizeof(*scm));
+        scm->creds.uid = current->uid;
+        scm->creds.gid = current->gid;
+        scm->creds.pid = current->tgid;
+        if (msg->msg_controllen <= 0)
+                return 0;
+        return __scm_send(sock, msg, scm);
+}
+
+static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
+                                struct scm_cookie *scm, int flags)
+{
+        if (!msg->msg_control)
+        {
+                if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
+                        msg->msg_flags |= MSG_CTRUNC;
+                scm_destroy(scm);
+                return;
+        }
+
+        if (test_bit(SOCK_PASSCRED, &sock->flags))
+                put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
+
+        if (!scm->fp)
+                return;
+        
+        scm_detach_fds(msg, scm);
+}
+
+
+#endif /* __LINUX_NET_SCM_H */
+