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1 | /* |
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 | |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/cgroup.h> |
15 | #include <linux/fdtable.h> |
16 | #include <net/cls_cgroup.h> |
17 | #include <net/sock.h> |
18 | |
19 | static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css) |
20 | { |
21 | return css ? container_of(css, struct cgroup_cls_state, css) : NULL; |
22 | } |
23 | |
24 | struct cgroup_cls_state *task_cls_state(struct task_struct *p) |
25 | { |
26 | return css_cls_state(task_css(p, net_cls_cgrp_id)); |
27 | } |
28 | EXPORT_SYMBOL_GPL(task_cls_state); |
29 | |
30 | static struct cgroup_subsys_state * |
31 | cgrp_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 | |
42 | static int cgrp_css_online(struct cgroup_subsys_state *css) |
43 | { |
44 | struct cgroup_cls_state *cs = css_cls_state(css); |
45 | struct cgroup_cls_state *parent = css_cls_state(css_parent(css)); |
46 | |
47 | if (parent) |
48 | cs->classid = parent->classid; |
49 | |
50 | return 0; |
51 | } |
52 | |
53 | static void cgrp_css_free(struct cgroup_subsys_state *css) |
54 | { |
55 | kfree(css_cls_state(css)); |
56 | } |
57 | |
58 | static int update_classid(const void *v, struct file *file, unsigned n) |
59 | { |
60 | int err; |
61 | struct socket *sock = sock_from_file(file, &err); |
62 | |
63 | if (sock) |
64 | sock->sk->sk_classid = (u32)(unsigned long)v; |
65 | |
66 | return 0; |
67 | } |
68 | |
69 | static void cgrp_attach(struct cgroup_subsys_state *css, |
70 | struct cgroup_taskset *tset) |
71 | { |
72 | struct cgroup_cls_state *cs = css_cls_state(css); |
73 | void *v = (void *)(unsigned long)cs->classid; |
74 | struct task_struct *p; |
75 | |
76 | cgroup_taskset_for_each(p, tset) { |
77 | task_lock(p); |
78 | iterate_fd(p->files, 0, update_classid, v); |
79 | task_unlock(p); |
80 | } |
81 | } |
82 | |
83 | static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft) |
84 | { |
85 | return css_cls_state(css)->classid; |
86 | } |
87 | |
88 | static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft, |
89 | u64 value) |
90 | { |
91 | css_cls_state(css)->classid = (u32) value; |
92 | |
93 | return 0; |
94 | } |
95 | |
96 | static struct cftype ss_files[] = { |
97 | { |
98 | .name = "classid", |
99 | .read_u64 = read_classid, |
100 | .write_u64 = write_classid, |
101 | }, |
102 | { } /* terminate */ |
103 | }; |
104 | |
105 | struct cgroup_subsys net_cls_cgrp_subsys = { |
106 | .css_alloc = cgrp_css_alloc, |
107 | .css_online = cgrp_css_online, |
108 | .css_free = cgrp_css_free, |
109 | .attach = cgrp_attach, |
110 | .base_cftypes = ss_files, |
111 | }; |
112 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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