blob: 46e8830c197986353662f469d5a377ff1b71af43 [file] [log] [blame]
Daniel Borkmannfe1217c2013-12-29 18:27:10 +01001/*
2 * net/core/netclassid_cgroup.c Classid Cgroupfs Handling
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 */
11
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010012#include <linux/slab.h>
13#include <linux/cgroup.h>
14#include <linux/fdtable.h>
15#include <net/cls_cgroup.h>
16#include <net/sock.h>
17
18static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css)
19{
20 return css ? container_of(css, struct cgroup_cls_state, css) : NULL;
21}
22
23struct cgroup_cls_state *task_cls_state(struct task_struct *p)
24{
Konstantin Khlebnikovcc9f4da2015-07-22 12:23:20 +030025 return css_cls_state(task_css_check(p, net_cls_cgrp_id,
26 rcu_read_lock_bh_held()));
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010027}
28EXPORT_SYMBOL_GPL(task_cls_state);
29
30static struct cgroup_subsys_state *
31cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
32{
33 struct cgroup_cls_state *cs;
34
35 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
36 if (!cs)
37 return ERR_PTR(-ENOMEM);
38
39 return &cs->css;
40}
41
42static int cgrp_css_online(struct cgroup_subsys_state *css)
43{
44 struct cgroup_cls_state *cs = css_cls_state(css);
Tejun Heo5c9d5352014-05-16 13:22:48 -040045 struct cgroup_cls_state *parent = css_cls_state(css->parent);
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010046
47 if (parent)
48 cs->classid = parent->classid;
49
50 return 0;
51}
52
53static void cgrp_css_free(struct cgroup_subsys_state *css)
54{
55 kfree(css_cls_state(css));
56}
57
Nina Schiff3b137582015-11-20 12:31:39 -080058static int update_classid_sock(const void *v, struct file *file, unsigned n)
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010059{
60 int err;
61 struct socket *sock = sock_from_file(file, &err);
62
Tejun Heobd1060a2015-12-07 17:38:53 -050063 if (sock) {
64 spin_lock(&cgroup_sk_update_lock);
Tejun Heo2a56a1f2015-12-07 17:38:52 -050065 sock_cgroup_set_classid(&sock->sk->sk_cgrp_data,
66 (unsigned long)v);
Tejun Heobd1060a2015-12-07 17:38:53 -050067 spin_unlock(&cgroup_sk_update_lock);
68 }
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010069 return 0;
70}
71
Tejun Heo0b98f0c2015-12-07 10:09:03 -050072static void cgrp_attach(struct cgroup_taskset *tset)
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010073{
Tejun Heo0b98f0c2015-12-07 10:09:03 -050074 struct cgroup_subsys_state *css;
Tejun Heo62f63412017-03-14 19:25:56 -040075 struct task_struct *p;
Tejun Heo0b98f0c2015-12-07 10:09:03 -050076
Tejun Heo62f63412017-03-14 19:25:56 -040077 cgroup_taskset_for_each(p, css, tset) {
78 task_lock(p);
79 iterate_fd(p->files, 0, update_classid_sock,
80 (void *)(unsigned long)css_cls_state(css)->classid);
81 task_unlock(p);
82 }
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010083}
84
85static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft)
86{
87 return css_cls_state(css)->classid;
88}
89
90static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft,
91 u64 value)
92{
Nina Schiff3b137582015-11-20 12:31:39 -080093 struct cgroup_cls_state *cs = css_cls_state(css);
Tejun Heo62f63412017-03-14 19:25:56 -040094 struct css_task_iter it;
95 struct task_struct *p;
Daniel Borkmannfe1217c2013-12-29 18:27:10 +010096
Tejun Heobd1060a2015-12-07 17:38:53 -050097 cgroup_sk_alloc_disable();
98
Nina Schiff3b137582015-11-20 12:31:39 -080099 cs->classid = (u32)value;
100
Tejun Heo62f63412017-03-14 19:25:56 -0400101 css_task_iter_start(css, &it);
102 while ((p = css_task_iter_next(&it))) {
103 task_lock(p);
104 iterate_fd(p->files, 0, update_classid_sock,
105 (void *)(unsigned long)cs->classid);
106 task_unlock(p);
107 }
108 css_task_iter_end(&it);
109
Daniel Borkmannfe1217c2013-12-29 18:27:10 +0100110 return 0;
111}
112
113static struct cftype ss_files[] = {
114 {
115 .name = "classid",
116 .read_u64 = read_classid,
117 .write_u64 = write_classid,
118 },
119 { } /* terminate */
120};
121
Tejun Heo073219e2014-02-08 10:36:58 -0500122struct cgroup_subsys net_cls_cgrp_subsys = {
Daniel Borkmannfe1217c2013-12-29 18:27:10 +0100123 .css_alloc = cgrp_css_alloc,
124 .css_online = cgrp_css_online,
125 .css_free = cgrp_css_free,
126 .attach = cgrp_attach,
Tejun Heo55779642014-07-15 11:05:09 -0400127 .legacy_cftypes = ss_files,
Daniel Borkmannfe1217c2013-12-29 18:27:10 +0100128};