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Diffstat (limited to 'net/core/netclassid_cgroup.c')
-rw-r--r--net/core/netclassid_cgroup.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/net/core/netclassid_cgroup.c b/net/core/netclassid_cgroup.c
new file mode 100644
index 00000000000..719efd54166
--- /dev/null
+++ b/net/core/netclassid_cgroup.c
@@ -0,0 +1,120 @@
+/*
+ * 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_subsys_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(css));
+
+ 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, css, 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_subsys = {
+ .name = "net_cls",
+ .css_alloc = cgrp_css_alloc,
+ .css_online = cgrp_css_online,
+ .css_free = cgrp_css_free,
+ .attach = cgrp_attach,
+ .subsys_id = net_cls_subsys_id,
+ .base_cftypes = ss_files,
+ .module = THIS_MODULE,
+};
+
+static int __init init_netclassid_cgroup(void)
+{
+ return cgroup_load_subsys(&net_cls_subsys);
+}
+__initcall(init_netclassid_cgroup);