This is a skeleton implementation of a cgroup controller for networking
properties. It will be used for:
* limiting the specific ports that a process in a cgroup is allowed to bind
to or listen on
* restricting which dscp values processes can use with their sockets
* limiting the total number of udp ports that can be used by a process
Also there is new documentation of this controller in
Documentation/cgroup-v1/net.txt.
Signed-off-by: Anoop Naravaram <anaravaram@xxxxxxxxxx>
---
Documentation/cgroup-v1/net.txt | 9 ++++++
include/linux/cgroup_subsys.h | 4 +++
include/net/net_cgroup.h | 27 ++++++++++++++++++
net/Kconfig | 10 +++++++
net/core/Makefile | 1 +
net/core/net_cgroup.c | 62 +++++++++++++++++++++++++++++++++++++++++
6 files changed, 113 insertions(+)
create mode 100644 Documentation/cgroup-v1/net.txt
create mode 100644 include/net/net_cgroup.h
create mode 100644 net/core/net_cgroup.c
diff --git a/Documentation/cgroup-v1/net.txt b/Documentation/cgroup-v1/net.txt
new file mode 100644
index 0000000..580c214
--- /dev/null
+++ b/Documentation/cgroup-v1/net.txt
@@ -0,0 +1,9 @@
+Networking cgroup
+=================
+
+The net cgroup controller keeps track of the following networking related
+properties for each process group:
+* bind port ranges
+* listen port ranges
+* dscp ranges
+* udp port usage and limit
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 0df0336a..81ff75b 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -40,6 +40,10 @@ SUBSYS(freezer)
SUBSYS(net_cls)
#endif
+#if IS_ENABLED(CONFIG_CGROUP_NET)
+SUBSYS(net)
+#endif
+
#if IS_ENABLED(CONFIG_CGROUP_PERF)
SUBSYS(perf_event)
#endif
diff --git a/include/net/net_cgroup.h b/include/net/net_cgroup.h
new file mode 100644
index 0000000..8e98803
--- /dev/null
+++ b/include/net/net_cgroup.h
@@ -0,0 +1,27 @@
+/*
+ * net_cgroup.h Networking Control Group
+ *
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * Authors: Anoop Naravaram <anaravaram@xxxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+
+#ifndef _NET_CGROUP_H
+#define _NET_CGROUP_H
+
+#include <linux/cgroup.h>
+
+#ifdef CONFIG_CGROUP_NET
+
+struct net_cgroup {
+ struct cgroup_subsys_state css;
+};
+
+#endif /* CONFIG_CGROUP_NET */
+#endif /* _NET_CGROUP_H */
diff --git a/net/Kconfig b/net/Kconfig
index c2cdbce..47f68bd 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -278,6 +278,16 @@ config CGROUP_NET_CLASSID
Cgroup subsystem for use as general purpose socket classid marker that is
being used in cls_cgroup and for netfilter matching.
+config CGROUP_NET
+ bool "Networking cgroup"
+ depends on CGROUPS
+ ---help---
+ Cgroup subsystem for use in managing several networking properties,
+ such as restricting which ports are available for processes to bind
+ and listen on, restricting which dscp values processes can use with
+ their sockets, and limiting the number of udp ports that can be
+ acquired by processes from the cgroup.
+
config NET_RX_BUSY_POLL
bool
default y
diff --git a/net/core/Makefile b/net/core/Makefile
index d6508c2..9dbc8b6 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += timestamping.o
obj-$(CONFIG_NET_PTP_CLASSIFY) += ptp_classifier.o
obj-$(CONFIG_CGROUP_NET_PRIO) += netprio_cgroup.o
obj-$(CONFIG_CGROUP_NET_CLASSID) += netclassid_cgroup.o
+obj-$(CONFIG_CGROUP_NET) += net_cgroup.o
obj-$(CONFIG_LWTUNNEL) += lwtunnel.o
obj-$(CONFIG_DST_CACHE) += dst_cache.o
obj-$(CONFIG_HWBM) += hwbm.o
diff --git a/net/core/net_cgroup.c b/net/core/net_cgroup.c
new file mode 100644
index 0000000..3a46960
--- /dev/null
+++ b/net/core/net_cgroup.c
@@ -0,0 +1,62 @@
+/*
+ * net/core/net_cgroup.c Networking Control Group
+ *
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * 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: Anoop Naravaram <anaravaram@xxxxxxxxxx>
+ */
+
+#include <linux/slab.h>
+#include <net/net_cgroup.h>
+
+static struct net_cgroup *css_to_net_cgroup(struct cgroup_subsys_state *css)
+{
+ return css ? container_of(css, struct net_cgroup, css) : NULL;
+}
+
+static struct net_cgroup *task_to_net_cgroup(struct task_struct *p)
+{
+ return css_to_net_cgroup(task_css(p, net_cgrp_id));
+}
+
+static struct net_cgroup *net_cgroup_to_parent(struct net_cgroup *netcg)
+{
+ return css_to_net_cgroup(netcg->css.parent);
+}
+
+static void free_net_cgroup(struct net_cgroup *netcg)
+{
+ kfree(netcg);
+}
+
+static struct cgroup_subsys_state *
+cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
+{
+ struct net_cgroup *netcg;
+
+ netcg = kzalloc(sizeof(*netcg), GFP_KERNEL);
+ if (!netcg)
+ return ERR_PTR(-ENOMEM);
+
+ return &netcg->css;
+}
+
+static void cgrp_css_free(struct cgroup_subsys_state *css)
+{
+ free_net_cgroup(css_to_net_cgroup(css));
+}
+
+static struct cftype ss_files[] = {
+ { } /* terminate */
+};
+
+struct cgroup_subsys net_cgrp_subsys = {
+ .css_alloc = cgrp_css_alloc,
+ .css_free = cgrp_css_free,
+ .legacy_cftypes = ss_files,
+};
--
2.8.0.rc3.226.g39d4020
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