1b886d83cSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2bdc8e5f8SSerge E. Hallyn /*
3bdc8e5f8SSerge E. Hallyn * Copyright (C) 2007 IBM Corporation
4bdc8e5f8SSerge E. Hallyn *
5bdc8e5f8SSerge E. Hallyn * Author: Cedric Le Goater <clg@fr.ibm.com>
6bdc8e5f8SSerge E. Hallyn */
7bdc8e5f8SSerge E. Hallyn
8bdc8e5f8SSerge E. Hallyn #include <linux/nsproxy.h>
9bdc8e5f8SSerge E. Hallyn #include <linux/ipc_namespace.h>
10bdc8e5f8SSerge E. Hallyn #include <linux/sysctl.h>
11bdc8e5f8SSerge E. Hallyn
12dc55e35fSAlexey Gladkov #include <linux/stat.h>
13dc55e35fSAlexey Gladkov #include <linux/capability.h>
14dc55e35fSAlexey Gladkov #include <linux/slab.h>
15bdc8e5f8SSerge E. Hallyn
16bdc8e5f8SSerge E. Hallyn static int msg_max_limit_min = MIN_MSGMAX;
1793e6f119SDoug Ledford static int msg_max_limit_max = HARD_MSGMAX;
18bdc8e5f8SSerge E. Hallyn
19bdc8e5f8SSerge E. Hallyn static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
2093e6f119SDoug Ledford static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
21bdc8e5f8SSerge E. Hallyn
22a5c5928bSJoe Perches static struct ctl_table mq_sysctls[] = {
23bdc8e5f8SSerge E. Hallyn {
24bdc8e5f8SSerge E. Hallyn .procname = "queues_max",
25bdc8e5f8SSerge E. Hallyn .data = &init_ipc_ns.mq_queues_max,
26bdc8e5f8SSerge E. Hallyn .maxlen = sizeof(int),
27bdc8e5f8SSerge E. Hallyn .mode = 0644,
28dc55e35fSAlexey Gladkov .proc_handler = proc_dointvec,
29bdc8e5f8SSerge E. Hallyn },
30bdc8e5f8SSerge E. Hallyn {
31bdc8e5f8SSerge E. Hallyn .procname = "msg_max",
32bdc8e5f8SSerge E. Hallyn .data = &init_ipc_ns.mq_msg_max,
33bdc8e5f8SSerge E. Hallyn .maxlen = sizeof(int),
34bdc8e5f8SSerge E. Hallyn .mode = 0644,
35dc55e35fSAlexey Gladkov .proc_handler = proc_dointvec_minmax,
36bdc8e5f8SSerge E. Hallyn .extra1 = &msg_max_limit_min,
37bdc8e5f8SSerge E. Hallyn .extra2 = &msg_max_limit_max,
38bdc8e5f8SSerge E. Hallyn },
39bdc8e5f8SSerge E. Hallyn {
40bdc8e5f8SSerge E. Hallyn .procname = "msgsize_max",
41bdc8e5f8SSerge E. Hallyn .data = &init_ipc_ns.mq_msgsize_max,
42bdc8e5f8SSerge E. Hallyn .maxlen = sizeof(int),
43bdc8e5f8SSerge E. Hallyn .mode = 0644,
44dc55e35fSAlexey Gladkov .proc_handler = proc_dointvec_minmax,
45bdc8e5f8SSerge E. Hallyn .extra1 = &msg_maxsize_limit_min,
46bdc8e5f8SSerge E. Hallyn .extra2 = &msg_maxsize_limit_max,
47bdc8e5f8SSerge E. Hallyn },
48cef0184cSKOSAKI Motohiro {
49cef0184cSKOSAKI Motohiro .procname = "msg_default",
50cef0184cSKOSAKI Motohiro .data = &init_ipc_ns.mq_msg_default,
51cef0184cSKOSAKI Motohiro .maxlen = sizeof(int),
52cef0184cSKOSAKI Motohiro .mode = 0644,
53dc55e35fSAlexey Gladkov .proc_handler = proc_dointvec_minmax,
54cef0184cSKOSAKI Motohiro .extra1 = &msg_max_limit_min,
55cef0184cSKOSAKI Motohiro .extra2 = &msg_max_limit_max,
56cef0184cSKOSAKI Motohiro },
57cef0184cSKOSAKI Motohiro {
58cef0184cSKOSAKI Motohiro .procname = "msgsize_default",
59cef0184cSKOSAKI Motohiro .data = &init_ipc_ns.mq_msgsize_default,
60cef0184cSKOSAKI Motohiro .maxlen = sizeof(int),
61cef0184cSKOSAKI Motohiro .mode = 0644,
62dc55e35fSAlexey Gladkov .proc_handler = proc_dointvec_minmax,
63cef0184cSKOSAKI Motohiro .extra1 = &msg_maxsize_limit_min,
64cef0184cSKOSAKI Motohiro .extra2 = &msg_maxsize_limit_max,
65cef0184cSKOSAKI Motohiro },
662bc4657cSEric W. Biederman {}
67bdc8e5f8SSerge E. Hallyn };
68bdc8e5f8SSerge E. Hallyn
set_lookup(struct ctl_table_root * root)69dc55e35fSAlexey Gladkov static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
70bdc8e5f8SSerge E. Hallyn {
71dc55e35fSAlexey Gladkov return ¤t->nsproxy->ipc_ns->mq_set;
72dc55e35fSAlexey Gladkov }
73dc55e35fSAlexey Gladkov
set_is_seen(struct ctl_table_set * set)74dc55e35fSAlexey Gladkov static int set_is_seen(struct ctl_table_set *set)
75dc55e35fSAlexey Gladkov {
76dc55e35fSAlexey Gladkov return ¤t->nsproxy->ipc_ns->mq_set == set;
77dc55e35fSAlexey Gladkov }
78dc55e35fSAlexey Gladkov
79dc55e35fSAlexey Gladkov static struct ctl_table_root set_root = {
80dc55e35fSAlexey Gladkov .lookup = set_lookup,
81bdc8e5f8SSerge E. Hallyn };
82bdc8e5f8SSerge E. Hallyn
setup_mq_sysctls(struct ipc_namespace * ns)83dc55e35fSAlexey Gladkov bool setup_mq_sysctls(struct ipc_namespace *ns)
84bdc8e5f8SSerge E. Hallyn {
85dc55e35fSAlexey Gladkov struct ctl_table *tbl;
86bdc8e5f8SSerge E. Hallyn
87dc55e35fSAlexey Gladkov setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
88dc55e35fSAlexey Gladkov
89dc55e35fSAlexey Gladkov tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
90dc55e35fSAlexey Gladkov if (tbl) {
91dc55e35fSAlexey Gladkov int i;
92dc55e35fSAlexey Gladkov
93dc55e35fSAlexey Gladkov for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
94dc55e35fSAlexey Gladkov if (tbl[i].data == &init_ipc_ns.mq_queues_max)
95dc55e35fSAlexey Gladkov tbl[i].data = &ns->mq_queues_max;
96dc55e35fSAlexey Gladkov
97dc55e35fSAlexey Gladkov else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
98dc55e35fSAlexey Gladkov tbl[i].data = &ns->mq_msg_max;
99dc55e35fSAlexey Gladkov
100dc55e35fSAlexey Gladkov else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
101dc55e35fSAlexey Gladkov tbl[i].data = &ns->mq_msgsize_max;
102dc55e35fSAlexey Gladkov
103dc55e35fSAlexey Gladkov else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
104dc55e35fSAlexey Gladkov tbl[i].data = &ns->mq_msg_default;
105dc55e35fSAlexey Gladkov
106dc55e35fSAlexey Gladkov else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
107dc55e35fSAlexey Gladkov tbl[i].data = &ns->mq_msgsize_default;
108dc55e35fSAlexey Gladkov else
109dc55e35fSAlexey Gladkov tbl[i].data = NULL;
110dc55e35fSAlexey Gladkov }
111dc55e35fSAlexey Gladkov
112*bff97cf1SJoel Granados ns->mq_sysctls = __register_sysctl_table(&ns->mq_set,
113*bff97cf1SJoel Granados "fs/mqueue", tbl,
114*bff97cf1SJoel Granados ARRAY_SIZE(mq_sysctls));
115dc55e35fSAlexey Gladkov }
116dc55e35fSAlexey Gladkov if (!ns->mq_sysctls) {
117dc55e35fSAlexey Gladkov kfree(tbl);
118dc55e35fSAlexey Gladkov retire_sysctl_set(&ns->mq_set);
119dc55e35fSAlexey Gladkov return false;
120dc55e35fSAlexey Gladkov }
121dc55e35fSAlexey Gladkov
122dc55e35fSAlexey Gladkov return true;
123dc55e35fSAlexey Gladkov }
124dc55e35fSAlexey Gladkov
retire_mq_sysctls(struct ipc_namespace * ns)125dc55e35fSAlexey Gladkov void retire_mq_sysctls(struct ipc_namespace *ns)
126bdc8e5f8SSerge E. Hallyn {
127dc55e35fSAlexey Gladkov struct ctl_table *tbl;
128dc55e35fSAlexey Gladkov
129dc55e35fSAlexey Gladkov tbl = ns->mq_sysctls->ctl_table_arg;
130dc55e35fSAlexey Gladkov unregister_sysctl_table(ns->mq_sysctls);
131dc55e35fSAlexey Gladkov retire_sysctl_set(&ns->mq_set);
132dc55e35fSAlexey Gladkov kfree(tbl);
133bdc8e5f8SSerge E. Hallyn }
134