Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 67 insertions, 0 deletions

diff --git a/pfinet/linux-src/include/net/scm.h b/pfinet/linux-src/include/net/scm.h
new file mode 100644
index 00000000..98c2dc91
--- /dev/null
+++ b/pfinet/linux-src/include/net/scm.h
@@ -0,0 +1,67 @@
+#ifndef __LINUX_NET_SCM_H
+#define __LINUX_NET_SCM_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 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->pid;
+	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 (sock->passcred || scm->fp)
+			msg->msg_flags |= MSG_CTRUNC;
+		scm_destroy(scm);
+		return;
+	}
+
+	if (sock->passcred)
+		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
+