Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / core / netclassid_cgroup.c

diff --git a/kernel/net/core/netclassid_cgroup.c b/kernel/net/core/netclassid_cgroup.c
new file mode 100644 (file)
index 0000000..1f2a126
--- /dev/null
+++ b/kernel/net/core/netclassid_cgroup.c
@@ -0,0 +1,111 @@
+/*
+ * net/core/netclassid_cgroup.c        Classid Cgroupfs Handling
+ *
+ *             This program is free software; you can redistribute it and/or
+ *             modify it under the terms of the GNU General Public License
+ *             as published by the Free Software Foundation; either version
+ *             2 of the License, or (at your option) any later version.
+ *
+ * Authors:    Thomas Graf <tgraf@suug.ch>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/cgroup.h>
+#include <linux/fdtable.h>
+#include <net/cls_cgroup.h>
+#include <net/sock.h>
+
+static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css)
+{
+       return css ? container_of(css, struct cgroup_cls_state, css) : NULL;
+}
+
+struct cgroup_cls_state *task_cls_state(struct task_struct *p)
+{
+       return css_cls_state(task_css(p, net_cls_cgrp_id));
+}
+EXPORT_SYMBOL_GPL(task_cls_state);
+
+static struct cgroup_subsys_state *
+cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
+{
+       struct cgroup_cls_state *cs;
+
+       cs = kzalloc(sizeof(*cs), GFP_KERNEL);
+       if (!cs)
+               return ERR_PTR(-ENOMEM);
+
+       return &cs->css;
+}
+
+static int cgrp_css_online(struct cgroup_subsys_state *css)
+{
+       struct cgroup_cls_state *cs = css_cls_state(css);
+       struct cgroup_cls_state *parent = css_cls_state(css->parent);
+
+       if (parent)
+               cs->classid = parent->classid;
+
+       return 0;
+}
+
+static void cgrp_css_free(struct cgroup_subsys_state *css)
+{
+       kfree(css_cls_state(css));
+}
+
+static int update_classid(const void *v, struct file *file, unsigned n)
+{
+       int err;
+       struct socket *sock = sock_from_file(file, &err);
+
+       if (sock)
+               sock->sk->sk_classid = (u32)(unsigned long)v;
+
+       return 0;
+}
+
+static void cgrp_attach(struct cgroup_subsys_state *css,
+                       struct cgroup_taskset *tset)
+{
+       struct cgroup_cls_state *cs = css_cls_state(css);
+       void *v = (void *)(unsigned long)cs->classid;
+       struct task_struct *p;
+
+       cgroup_taskset_for_each(p, tset) {
+               task_lock(p);
+               iterate_fd(p->files, 0, update_classid, v);
+               task_unlock(p);
+       }
+}
+
+static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft)
+{
+       return css_cls_state(css)->classid;
+}
+
+static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft,
+                        u64 value)
+{
+       css_cls_state(css)->classid = (u32) value;
+
+       return 0;
+}
+
+static struct cftype ss_files[] = {
+       {
+               .name           = "classid",
+               .read_u64       = read_classid,
+               .write_u64      = write_classid,
+       },
+       { }     /* terminate */
+};
+
+struct cgroup_subsys net_cls_cgrp_subsys = {
+       .css_alloc              = cgrp_css_alloc,
+       .css_online             = cgrp_css_online,
+       .css_free               = cgrp_css_free,
+       .attach                 = cgrp_attach,
+       .legacy_cftypes         = ss_files,
+};