net/ieee802154/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Netlink interface for IEEE 802.15.4 stack
   4  *
   5  * Copyright 2007, 2008 Siemens AG
   6  *
   7  * Written by:
   8  * Sergey Lapin <slapin@ossfans.org>
   9  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  10  * Maxim Osipov <maxim.osipov@siemens.com>
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/gfp.h>
  15 #include <net/genetlink.h>
  16 #include <linux/nl802154.h>
  17
  18 #include "ieee802154.h"
  19
  20 static unsigned int ieee802154_seq_num;
  21 static DEFINE_SPINLOCK(ieee802154_seq_lock);
  22
  23 /* Requests to userspace */
  24 struct sk_buff *ieee802154_nl_create(int flags, u8 req)
  25 {
  26         void *hdr;
  27         struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
  28         unsigned long f;
  29
  30         if (!msg)
  31                 return NULL;
  32
  33         spin_lock_irqsave(&ieee802154_seq_lock, f);
  34         hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
  35                           &nl802154_family, flags, req);
  36         spin_unlock_irqrestore(&ieee802154_seq_lock, f);
  37         if (!hdr) {
  38                 nlmsg_free(msg);
  39                 return NULL;
  40         }
  41
  42         return msg;
  43 }
  44
  45 int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
  46 {
  47         struct nlmsghdr *nlh = nlmsg_hdr(msg);
  48         void *hdr = genlmsg_data(nlmsg_data(nlh));
  49
  50         genlmsg_end(msg, hdr);
  51
  52         return genlmsg_multicast(&nl802154_family, msg, 0, group, GFP_ATOMIC);
  53 }
  54
  55 struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
  56                                         int flags, u8 req)
  57 {
  58         void *hdr;
  59         struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
  60
  61         if (!msg)
  62                 return NULL;
  63
  64         hdr = genlmsg_put_reply(msg, info,
  65                                 &nl802154_family, flags, req);
  66         if (!hdr) {
  67                 nlmsg_free(msg);
  68                 return NULL;
  69         }
  70
  71         return msg;
  72 }
  73
  74 int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
  75 {
  76         struct nlmsghdr *nlh = nlmsg_hdr(msg);
  77         void *hdr = genlmsg_data(nlmsg_data(nlh));
  78
  79         genlmsg_end(msg, hdr);
  80
  81         return genlmsg_reply(msg, info);
  82 }
  83
  84 static const struct genl_small_ops ieee802154_ops[] = {
  85         /* see nl-phy.c */
  86         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
  87                         ieee802154_dump_phy),
  88         IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
  89         IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
  90         /* see nl-mac.c */
  91         IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
  92         IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
  93         IEEE802154_OP(IEEE802154_DISASSOCIATE_REQ, ieee802154_disassociate_req),
  94         IEEE802154_OP(IEEE802154_SCAN_REQ, ieee802154_scan_req),
  95         IEEE802154_OP(IEEE802154_START_REQ, ieee802154_start_req),
  96         IEEE802154_DUMP(IEEE802154_LIST_IFACE, ieee802154_list_iface,
  97                         ieee802154_dump_iface),
  98         IEEE802154_OP(IEEE802154_SET_MACPARAMS, ieee802154_set_macparams),
  99         IEEE802154_OP(IEEE802154_LLSEC_GETPARAMS, ieee802154_llsec_getparams),
 100         IEEE802154_OP(IEEE802154_LLSEC_SETPARAMS, ieee802154_llsec_setparams),
 101         IEEE802154_DUMP(IEEE802154_LLSEC_LIST_KEY, NULL,
 102                         ieee802154_llsec_dump_keys),
 103         IEEE802154_OP(IEEE802154_LLSEC_ADD_KEY, ieee802154_llsec_add_key),
 104         IEEE802154_OP(IEEE802154_LLSEC_DEL_KEY, ieee802154_llsec_del_key),
 105         IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEV, NULL,
 106                         ieee802154_llsec_dump_devs),
 107         IEEE802154_OP(IEEE802154_LLSEC_ADD_DEV, ieee802154_llsec_add_dev),
 108         IEEE802154_OP(IEEE802154_LLSEC_DEL_DEV, ieee802154_llsec_del_dev),
 109         IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEVKEY, NULL,
 110                         ieee802154_llsec_dump_devkeys),
 111         IEEE802154_OP(IEEE802154_LLSEC_ADD_DEVKEY, ieee802154_llsec_add_devkey),
 112         IEEE802154_OP(IEEE802154_LLSEC_DEL_DEVKEY, ieee802154_llsec_del_devkey),
 113         IEEE802154_DUMP(IEEE802154_LLSEC_LIST_SECLEVEL, NULL,
 114                         ieee802154_llsec_dump_seclevels),
 115         IEEE802154_OP(IEEE802154_LLSEC_ADD_SECLEVEL,
 116                       ieee802154_llsec_add_seclevel),
 117         IEEE802154_OP(IEEE802154_LLSEC_DEL_SECLEVEL,
 118                       ieee802154_llsec_del_seclevel),
 119 };
 120
 121 static const struct genl_multicast_group ieee802154_mcgrps[] = {
 122         [IEEE802154_COORD_MCGRP] = { .name = IEEE802154_MCAST_COORD_NAME, },
 123         [IEEE802154_BEACON_MCGRP] = { .name = IEEE802154_MCAST_BEACON_NAME, },
 124 };
 125
 126 struct genl_family nl802154_family __ro_after_init = {
 127         .hdrsize        = 0,
 128         .name           = IEEE802154_NL_NAME,
 129         .version        = 1,
 130         .maxattr        = IEEE802154_ATTR_MAX,
 131         .policy         = ieee802154_policy,
 132         .module         = THIS_MODULE,
 133         .small_ops      = ieee802154_ops,
 134         .n_small_ops    = ARRAY_SIZE(ieee802154_ops),
 135         .resv_start_op  = IEEE802154_LLSEC_DEL_SECLEVEL + 1,
 136         .mcgrps         = ieee802154_mcgrps,
 137         .n_mcgrps       = ARRAY_SIZE(ieee802154_mcgrps),
 138 };
 139
 140 int __init ieee802154_nl_init(void)
 141 {
 142         return genl_register_family(&nl802154_family);
 143 }
 144
 145 void ieee802154_nl_exit(void)
 146 {
 147         genl_unregister_family(&nl802154_family);
 148 }