Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / net / scm.h

diff --git a/kernel/include/net/scm.h b/kernel/include/net/scm.h
new file mode 100644 (file)
index 0000000..262532d
--- /dev/null
+++ b/kernel/include/net/scm.h
@@ -0,0 +1,141 @@
+#ifndef __LINUX_NET_SCM_H
+#define __LINUX_NET_SCM_H
+
+#include <linux/limits.h>
+#include <linux/net.h>
+#include <linux/security.h>
+#include <linux/pid.h>
+#include <linux/nsproxy.h>
+
+/* Well, we should have at least one descriptor open
+ * to accept passed FDs 8)
+ */
+#define SCM_MAX_FD     253
+
+struct scm_creds {
+       u32     pid;
+       kuid_t  uid;
+       kgid_t  gid;
+};
+
+struct scm_fp_list {
+       short                   count;
+       short                   max;
+       struct file             *fp[SCM_MAX_FD];
+};
+
+struct scm_cookie {
+       struct pid              *pid;           /* Skb credentials */
+       struct scm_fp_list      *fp;            /* Passed files         */
+       struct scm_creds        creds;          /* Skb credentials      */
+#ifdef CONFIG_SECURITY_NETWORK
+       u32                     secid;          /* Passed security ID   */
+#endif
+};
+
+void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
+void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
+int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
+void __scm_destroy(struct scm_cookie *scm);
+struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
+
+#ifdef CONFIG_SECURITY_NETWORK
+static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
+{
+       security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
+}
+#else
+static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
+{ }
+#endif /* CONFIG_SECURITY_NETWORK */
+
+static __inline__ void scm_set_cred(struct scm_cookie *scm,
+                                   struct pid *pid, kuid_t uid, kgid_t gid)
+{
+       scm->pid  = get_pid(pid);
+       scm->creds.pid = pid_vnr(pid);
+       scm->creds.uid = uid;
+       scm->creds.gid = gid;
+}
+
+static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
+{
+       put_pid(scm->pid);
+       scm->pid  = NULL;
+}
+
+static __inline__ void scm_destroy(struct scm_cookie *scm)
+{
+       scm_destroy_cred(scm);
+       if (scm->fp)
+               __scm_destroy(scm);
+}
+
+static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
+                              struct scm_cookie *scm, bool forcecreds)
+{
+       memset(scm, 0, sizeof(*scm));
+       scm->creds.uid = INVALID_UID;
+       scm->creds.gid = INVALID_GID;
+       if (forcecreds)
+               scm_set_cred(scm, task_tgid(current), current_uid(), current_gid());
+       unix_get_peersec_dgram(sock, scm);
+       if (msg->msg_controllen <= 0)
+               return 0;
+       return __scm_send(sock, msg, scm);
+}
+
+#ifdef CONFIG_SECURITY_NETWORK
+static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
+{
+       char *secdata;
+       u32 seclen;
+       int err;
+
+       if (test_bit(SOCK_PASSSEC, &sock->flags)) {
+               err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
+
+               if (!err) {
+                       put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
+                       security_release_secctx(secdata, seclen);
+               }
+       }
+}
+#else
+static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
+{ }
+#endif /* CONFIG_SECURITY_NETWORK */
+
+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)) {
+               struct user_namespace *current_ns = current_user_ns();
+               struct ucred ucreds = {
+                       .pid = scm->creds.pid,
+                       .uid = from_kuid_munged(current_ns, scm->creds.uid),
+                       .gid = from_kgid_munged(current_ns, scm->creds.gid),
+               };
+               put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds);
+       }
+
+       scm_destroy_cred(scm);
+
+       scm_passec(sock, msg, scm);
+
+       if (!scm->fp)
+               return;
+       
+       scm_detach_fds(msg, scm);
+}
+
+
+#endif /* __LINUX_NET_SCM_H */
+