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 }