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b9c15df9 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
b9c15df9 PS |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/version.h> | |
b9975b29 | 22 | #include <linux/completion.h> |
b9c15df9 PS |
23 | #include <net/genetlink.h> |
24 | #include "genl_exec.h" | |
25 | ||
26 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) | |
27 | ||
28 | static DEFINE_MUTEX(genl_exec_lock); | |
29 | ||
30 | static genl_exec_func_t genl_exec_function; | |
31 | static int genl_exec_function_ret; | |
32 | static void *genl_exec_data; | |
33 | static struct completion done; | |
34 | ||
35 | static struct sk_buff *genlmsg_skb; | |
36 | ||
37 | static int genl_exec_cmd(struct sk_buff *dummy, struct genl_info *dummy2) | |
38 | { | |
39 | genl_exec_function_ret = genl_exec_function(genl_exec_data); | |
40 | complete(&done); | |
41 | return 0; | |
42 | } | |
43 | ||
44 | enum exec_cmd { | |
45 | GENL_EXEC_UNSPEC, | |
46 | GENL_EXEC_RUN, | |
47 | }; | |
48 | ||
49 | static struct genl_family genl_exec_family = { | |
50 | .id = GENL_ID_GENERATE, | |
51 | .name = "ovs_genl_exec", | |
52 | .version = 1, | |
53 | }; | |
54 | ||
55 | static struct genl_ops genl_exec_ops[] = { | |
56 | { | |
57 | .cmd = GENL_EXEC_RUN, | |
58 | .doit = genl_exec_cmd, | |
59 | .flags = CAP_NET_ADMIN, | |
60 | }, | |
61 | }; | |
62 | ||
63 | int genl_exec_init(void) | |
64 | { | |
65 | int err; | |
66 | ||
67 | err = genl_register_family_with_ops(&genl_exec_family, | |
68 | genl_exec_ops, ARRAY_SIZE(genl_exec_ops)); | |
69 | ||
70 | if (err) | |
71 | return err; | |
72 | ||
73 | genlmsg_skb = genlmsg_new(0, GFP_KERNEL); | |
74 | if (!genlmsg_skb) { | |
75 | genl_unregister_family(&genl_exec_family); | |
76 | return -ENOMEM; | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
81 | void genl_exec_exit(void) | |
82 | { | |
83 | kfree_skb(genlmsg_skb); | |
84 | genl_unregister_family(&genl_exec_family); | |
85 | } | |
86 | ||
87 | /* genl_lock() is not exported from older kernel. | |
88 | * Following function allows any function to be executed with | |
89 | * genl_mutex held. */ | |
90 | ||
91 | int genl_exec(genl_exec_func_t func, void *data) | |
92 | { | |
93 | int ret; | |
94 | ||
95 | mutex_lock(&genl_exec_lock); | |
96 | ||
97 | init_completion(&done); | |
98 | skb_get(genlmsg_skb); | |
99 | genlmsg_put(genlmsg_skb, 0, 0, &genl_exec_family, | |
100 | NLM_F_REQUEST, GENL_EXEC_RUN); | |
101 | ||
102 | genl_exec_function = func; | |
103 | genl_exec_data = data; | |
2a4999f3 PS |
104 | |
105 | /* There is no need to send msg to current namespace. */ | |
b9c15df9 PS |
106 | ret = genlmsg_unicast(&init_net, genlmsg_skb, 0); |
107 | ||
108 | if (!ret) { | |
109 | wait_for_completion(&done); | |
110 | ret = genl_exec_function_ret; | |
111 | } else { | |
112 | pr_err("genl_exec send error %d\n", ret); | |
113 | } | |
114 | ||
115 | /* Wait for genetlink to kfree skb. */ | |
116 | while (skb_shared(genlmsg_skb)) | |
117 | cpu_relax(); | |
118 | ||
119 | genlmsg_skb->data = genlmsg_skb->head; | |
120 | skb_reset_tail_pointer(genlmsg_skb); | |
121 | ||
122 | mutex_unlock(&genl_exec_lock); | |
123 | ||
124 | return ret; | |
125 | } | |
126 | ||
127 | #else | |
128 | ||
129 | int genl_exec(genl_exec_func_t func, void *data) | |
130 | { | |
131 | int ret; | |
132 | ||
133 | genl_lock(); | |
134 | ret = func(data); | |
135 | genl_unlock(); | |
136 | return ret; | |
137 | } | |
138 | ||
139 | int genl_exec_init(void) | |
140 | { | |
141 | return 0; | |
142 | } | |
143 | ||
144 | void genl_exec_exit(void) | |
145 | { | |
146 | } | |
147 | #endif |