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fe1217c4 DB |
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 | ||
fe1217c4 DB |
12 | #include <linux/slab.h> |
13 | #include <linux/cgroup.h> | |
14 | #include <linux/fdtable.h> | |
f719ff9b IM |
15 | #include <linux/sched/task.h> |
16 | ||
fe1217c4 DB |
17 | #include <net/cls_cgroup.h> |
18 | #include <net/sock.h> | |
19 | ||
20 | static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css) | |
21 | { | |
22 | return css ? container_of(css, struct cgroup_cls_state, css) : NULL; | |
23 | } | |
24 | ||
25 | struct cgroup_cls_state *task_cls_state(struct task_struct *p) | |
26 | { | |
cc9f4daa KK |
27 | return css_cls_state(task_css_check(p, net_cls_cgrp_id, |
28 | rcu_read_lock_bh_held())); | |
fe1217c4 DB |
29 | } |
30 | EXPORT_SYMBOL_GPL(task_cls_state); | |
31 | ||
32 | static struct cgroup_subsys_state * | |
33 | cgrp_css_alloc(struct cgroup_subsys_state *parent_css) | |
34 | { | |
35 | struct cgroup_cls_state *cs; | |
36 | ||
37 | cs = kzalloc(sizeof(*cs), GFP_KERNEL); | |
38 | if (!cs) | |
39 | return ERR_PTR(-ENOMEM); | |
40 | ||
41 | return &cs->css; | |
42 | } | |
43 | ||
44 | static int cgrp_css_online(struct cgroup_subsys_state *css) | |
45 | { | |
46 | struct cgroup_cls_state *cs = css_cls_state(css); | |
5c9d535b | 47 | struct cgroup_cls_state *parent = css_cls_state(css->parent); |
fe1217c4 DB |
48 | |
49 | if (parent) | |
50 | cs->classid = parent->classid; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static void cgrp_css_free(struct cgroup_subsys_state *css) | |
56 | { | |
57 | kfree(css_cls_state(css)); | |
58 | } | |
59 | ||
3b13758f | 60 | static int update_classid_sock(const void *v, struct file *file, unsigned n) |
fe1217c4 DB |
61 | { |
62 | int err; | |
63 | struct socket *sock = sock_from_file(file, &err); | |
64 | ||
bd1060a1 TH |
65 | if (sock) { |
66 | spin_lock(&cgroup_sk_update_lock); | |
2a56a1fe TH |
67 | sock_cgroup_set_classid(&sock->sk->sk_cgrp_data, |
68 | (unsigned long)v); | |
bd1060a1 TH |
69 | spin_unlock(&cgroup_sk_update_lock); |
70 | } | |
fe1217c4 DB |
71 | return 0; |
72 | } | |
73 | ||
a05d4fd9 | 74 | static void cgrp_attach(struct cgroup_taskset *tset) |
fe1217c4 | 75 | { |
a05d4fd9 | 76 | struct cgroup_subsys_state *css; |
fe1217c4 DB |
77 | struct task_struct *p; |
78 | ||
a05d4fd9 | 79 | cgroup_taskset_for_each(p, css, tset) { |
fe1217c4 | 80 | task_lock(p); |
a05d4fd9 TH |
81 | iterate_fd(p->files, 0, update_classid_sock, |
82 | (void *)(unsigned long)css_cls_state(css)->classid); | |
fe1217c4 DB |
83 | task_unlock(p); |
84 | } | |
85 | } | |
86 | ||
87 | static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft) | |
88 | { | |
89 | return css_cls_state(css)->classid; | |
90 | } | |
91 | ||
92 | static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft, | |
93 | u64 value) | |
94 | { | |
3b13758f | 95 | struct cgroup_cls_state *cs = css_cls_state(css); |
a05d4fd9 TH |
96 | struct css_task_iter it; |
97 | struct task_struct *p; | |
3b13758f | 98 | |
bd1060a1 TH |
99 | cgroup_sk_alloc_disable(); |
100 | ||
3b13758f | 101 | cs->classid = (u32)value; |
fe1217c4 | 102 | |
a05d4fd9 TH |
103 | css_task_iter_start(css, &it); |
104 | while ((p = css_task_iter_next(&it))) { | |
105 | task_lock(p); | |
106 | iterate_fd(p->files, 0, update_classid_sock, | |
107 | (void *)(unsigned long)cs->classid); | |
108 | task_unlock(p); | |
109 | } | |
110 | css_task_iter_end(&it); | |
111 | ||
fe1217c4 DB |
112 | return 0; |
113 | } | |
114 | ||
115 | static struct cftype ss_files[] = { | |
116 | { | |
117 | .name = "classid", | |
118 | .read_u64 = read_classid, | |
119 | .write_u64 = write_classid, | |
120 | }, | |
121 | { } /* terminate */ | |
122 | }; | |
123 | ||
073219e9 | 124 | struct cgroup_subsys net_cls_cgrp_subsys = { |
fe1217c4 DB |
125 | .css_alloc = cgrp_css_alloc, |
126 | .css_online = cgrp_css_online, | |
127 | .css_free = cgrp_css_free, | |
128 | .attach = cgrp_attach, | |
5577964e | 129 | .legacy_cftypes = ss_files, |
fe1217c4 | 130 | }; |