afs: check function return
[linux-2.6-microblaze.git] / fs / cifs / netlink.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Netlink routines for CIFS
4  *
5  * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
6  */
7
8 #include <net/genetlink.h>
9 #include <uapi/linux/cifs/cifs_netlink.h>
10
11 #include "netlink.h"
12 #include "cifsglob.h"
13 #include "cifs_debug.h"
14 #include "cifs_swn.h"
15
16 static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = {
17         [CIFS_GENL_ATTR_SWN_REGISTRATION_ID]    = { .type = NLA_U32 },
18         [CIFS_GENL_ATTR_SWN_NET_NAME]           = { .type = NLA_STRING },
19         [CIFS_GENL_ATTR_SWN_SHARE_NAME]         = { .type = NLA_STRING },
20         [CIFS_GENL_ATTR_SWN_IP]                 = { .len = sizeof(struct sockaddr_storage) },
21         [CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY]    = { .type = NLA_FLAG },
22         [CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY]  = { .type = NLA_FLAG },
23         [CIFS_GENL_ATTR_SWN_IP_NOTIFY]          = { .type = NLA_FLAG },
24         [CIFS_GENL_ATTR_SWN_KRB_AUTH]           = { .type = NLA_FLAG },
25         [CIFS_GENL_ATTR_SWN_USER_NAME]          = { .type = NLA_STRING },
26         [CIFS_GENL_ATTR_SWN_PASSWORD]           = { .type = NLA_STRING },
27         [CIFS_GENL_ATTR_SWN_DOMAIN_NAME]        = { .type = NLA_STRING },
28         [CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]  = { .type = NLA_U32 },
29         [CIFS_GENL_ATTR_SWN_RESOURCE_STATE]     = { .type = NLA_U32 },
30         [CIFS_GENL_ATTR_SWN_RESOURCE_NAME]      = { .type = NLA_STRING},
31 };
32
33 static const struct genl_ops cifs_genl_ops[] = {
34         {
35                 .cmd = CIFS_GENL_CMD_SWN_NOTIFY,
36                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
37                 .doit = cifs_swn_notify,
38         },
39 };
40
41 static const struct genl_multicast_group cifs_genl_mcgrps[] = {
42         [CIFS_GENL_MCGRP_SWN] = { .name = CIFS_GENL_MCGRP_SWN_NAME },
43 };
44
45 struct genl_family cifs_genl_family = {
46         .name           = CIFS_GENL_NAME,
47         .version        = CIFS_GENL_VERSION,
48         .hdrsize        = 0,
49         .maxattr        = CIFS_GENL_ATTR_MAX,
50         .module         = THIS_MODULE,
51         .policy         = cifs_genl_policy,
52         .ops            = cifs_genl_ops,
53         .n_ops          = ARRAY_SIZE(cifs_genl_ops),
54         .mcgrps         = cifs_genl_mcgrps,
55         .n_mcgrps       = ARRAY_SIZE(cifs_genl_mcgrps),
56 };
57
58 /**
59  * cifs_genl_init - Register generic netlink family
60  *
61  * Return zero if initialized successfully, otherwise non-zero.
62  */
63 int cifs_genl_init(void)
64 {
65         int ret;
66
67         ret = genl_register_family(&cifs_genl_family);
68         if (ret < 0) {
69                 cifs_dbg(VFS, "%s: failed to register netlink family\n",
70                                 __func__);
71                 return ret;
72         }
73
74         return 0;
75 }
76
77 /**
78  * cifs_genl_exit - Unregister generic netlink family
79  */
80 void cifs_genl_exit(void)
81 {
82         int ret;
83
84         ret = genl_unregister_family(&cifs_genl_family);
85         if (ret < 0) {
86                 cifs_dbg(VFS, "%s: failed to unregister netlink family\n",
87                                 __func__);
88         }
89 }