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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/net/scm.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/net/scm.h')
-rw-r--r--include/net/scm.h71
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 */
+