net/batman-adv/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2016-2020  B.A.T.M.A.N. contributors:
   3  *
   4  * Matthias Schiffer
   5  */
   6
   7 #include "netlink.h"
   8 #include "main.h"
   9
  10 #include <linux/atomic.h>
  11 #include <linux/bitops.h>
  12 #include <linux/bug.h>
  13 #include <linux/byteorder/generic.h>
  14 #include <linux/cache.h>
  15 #include <linux/err.h>
  16 #include <linux/errno.h>
  17 #include <linux/export.h>
  18 #include <linux/genetlink.h>
  19 #include <linux/gfp.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/if_vlan.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/limits.h>
  25 #include <linux/list.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/netlink.h>
  28 #include <linux/printk.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/stddef.h>
  32 #include <linux/types.h>
  33 #include <net/genetlink.h>
  34 #include <net/net_namespace.h>
  35 #include <net/netlink.h>
  36 #include <net/sock.h>
  37 #include <uapi/linux/batadv_packet.h>
  38 #include <uapi/linux/batman_adv.h>
  39
  40 #include "bat_algo.h"
  41 #include "bridge_loop_avoidance.h"
  42 #include "distributed-arp-table.h"
  43 #include "gateway_client.h"
  44 #include "gateway_common.h"
  45 #include "hard-interface.h"
  46 #include "log.h"
  47 #include "multicast.h"
  48 #include "network-coding.h"
  49 #include "originator.h"
  50 #include "soft-interface.h"
  51 #include "tp_meter.h"
  52 #include "translation-table.h"
  53
  54 struct genl_family batadv_netlink_family;
  55
  56 /* multicast groups */
  57 enum batadv_netlink_multicast_groups {
  58         BATADV_NL_MCGRP_CONFIG,
  59         BATADV_NL_MCGRP_TPMETER,
  60 };
  61
  62 /**
  63  * enum batadv_genl_ops_flags - flags for genl_ops's internal_flags
  64  */
  65 enum batadv_genl_ops_flags {
  66         /**
  67          * @BATADV_FLAG_NEED_MESH: request requires valid soft interface in
  68          *  attribute BATADV_ATTR_MESH_IFINDEX and expects a pointer to it to be
  69          *  saved in info->user_ptr[0]
  70          */
  71         BATADV_FLAG_NEED_MESH = BIT(0),
  72
  73         /**
  74          * @BATADV_FLAG_NEED_HARDIF: request requires valid hard interface in
  75          *  attribute BATADV_ATTR_HARD_IFINDEX and expects a pointer to it to be
  76          *  saved in info->user_ptr[1]
  77          */
  78         BATADV_FLAG_NEED_HARDIF = BIT(1),
  79
  80         /**
  81          * @BATADV_FLAG_NEED_VLAN: request requires valid vlan in
  82          *  attribute BATADV_ATTR_VLANID and expects a pointer to it to be
  83          *  saved in info->user_ptr[1]
  84          */
  85         BATADV_FLAG_NEED_VLAN = BIT(2),
  86 };
  87
  88 static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
  89         [BATADV_NL_MCGRP_CONFIG] = { .name = BATADV_NL_MCAST_GROUP_CONFIG },
  90         [BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
  91 };
  92
  93 static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
  94         [BATADV_ATTR_VERSION]                   = { .type = NLA_STRING },
  95         [BATADV_ATTR_ALGO_NAME]                 = { .type = NLA_STRING },
  96         [BATADV_ATTR_MESH_IFINDEX]              = { .type = NLA_U32 },
  97         [BATADV_ATTR_MESH_IFNAME]               = { .type = NLA_STRING },
  98         [BATADV_ATTR_MESH_ADDRESS]              = { .len = ETH_ALEN },
  99         [BATADV_ATTR_HARD_IFINDEX]              = { .type = NLA_U32 },
 100         [BATADV_ATTR_HARD_IFNAME]               = { .type = NLA_STRING },
 101         [BATADV_ATTR_HARD_ADDRESS]              = { .len = ETH_ALEN },
 102         [BATADV_ATTR_ORIG_ADDRESS]              = { .len = ETH_ALEN },
 103         [BATADV_ATTR_TPMETER_RESULT]            = { .type = NLA_U8 },
 104         [BATADV_ATTR_TPMETER_TEST_TIME]         = { .type = NLA_U32 },
 105         [BATADV_ATTR_TPMETER_BYTES]             = { .type = NLA_U64 },
 106         [BATADV_ATTR_TPMETER_COOKIE]            = { .type = NLA_U32 },
 107         [BATADV_ATTR_ACTIVE]                    = { .type = NLA_FLAG },
 108         [BATADV_ATTR_TT_ADDRESS]                = { .len = ETH_ALEN },
 109         [BATADV_ATTR_TT_TTVN]                   = { .type = NLA_U8 },
 110         [BATADV_ATTR_TT_LAST_TTVN]              = { .type = NLA_U8 },
 111         [BATADV_ATTR_TT_CRC32]                  = { .type = NLA_U32 },
 112         [BATADV_ATTR_TT_VID]                    = { .type = NLA_U16 },
 113         [BATADV_ATTR_TT_FLAGS]                  = { .type = NLA_U32 },
 114         [BATADV_ATTR_FLAG_BEST]                 = { .type = NLA_FLAG },
 115         [BATADV_ATTR_LAST_SEEN_MSECS]           = { .type = NLA_U32 },
 116         [BATADV_ATTR_NEIGH_ADDRESS]             = { .len = ETH_ALEN },
 117         [BATADV_ATTR_TQ]                        = { .type = NLA_U8 },
 118         [BATADV_ATTR_THROUGHPUT]                = { .type = NLA_U32 },
 119         [BATADV_ATTR_BANDWIDTH_UP]              = { .type = NLA_U32 },
 120         [BATADV_ATTR_BANDWIDTH_DOWN]            = { .type = NLA_U32 },
 121         [BATADV_ATTR_ROUTER]                    = { .len = ETH_ALEN },
 122         [BATADV_ATTR_BLA_OWN]                   = { .type = NLA_FLAG },
 123         [BATADV_ATTR_BLA_ADDRESS]               = { .len = ETH_ALEN },
 124         [BATADV_ATTR_BLA_VID]                   = { .type = NLA_U16 },
 125         [BATADV_ATTR_BLA_BACKBONE]              = { .len = ETH_ALEN },
 126         [BATADV_ATTR_BLA_CRC]                   = { .type = NLA_U16 },
 127         [BATADV_ATTR_DAT_CACHE_IP4ADDRESS]      = { .type = NLA_U32 },
 128         [BATADV_ATTR_DAT_CACHE_HWADDRESS]       = { .len = ETH_ALEN },
 129         [BATADV_ATTR_DAT_CACHE_VID]             = { .type = NLA_U16 },
 130         [BATADV_ATTR_MCAST_FLAGS]               = { .type = NLA_U32 },
 131         [BATADV_ATTR_MCAST_FLAGS_PRIV]          = { .type = NLA_U32 },
 132         [BATADV_ATTR_VLANID]                    = { .type = NLA_U16 },
 133         [BATADV_ATTR_AGGREGATED_OGMS_ENABLED]   = { .type = NLA_U8 },
 134         [BATADV_ATTR_AP_ISOLATION_ENABLED]      = { .type = NLA_U8 },
 135         [BATADV_ATTR_ISOLATION_MARK]            = { .type = NLA_U32 },
 136         [BATADV_ATTR_ISOLATION_MASK]            = { .type = NLA_U32 },
 137         [BATADV_ATTR_BONDING_ENABLED]           = { .type = NLA_U8 },
 138         [BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]     = { .type = NLA_U8 },
 139         [BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]     = { .type = NLA_U8 },
 140         [BATADV_ATTR_FRAGMENTATION_ENABLED]     = { .type = NLA_U8 },
 141         [BATADV_ATTR_GW_BANDWIDTH_DOWN]         = { .type = NLA_U32 },
 142         [BATADV_ATTR_GW_BANDWIDTH_UP]           = { .type = NLA_U32 },
 143         [BATADV_ATTR_GW_MODE]                   = { .type = NLA_U8 },
 144         [BATADV_ATTR_GW_SEL_CLASS]              = { .type = NLA_U32 },
 145         [BATADV_ATTR_HOP_PENALTY]               = { .type = NLA_U8 },
 146         [BATADV_ATTR_LOG_LEVEL]                 = { .type = NLA_U32 },
 147         [BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]      = { .type = NLA_U8 },
 148         [BATADV_ATTR_MULTICAST_FANOUT]          = { .type = NLA_U32 },
 149         [BATADV_ATTR_NETWORK_CODING_ENABLED]    = { .type = NLA_U8 },
 150         [BATADV_ATTR_ORIG_INTERVAL]             = { .type = NLA_U32 },
 151         [BATADV_ATTR_ELP_INTERVAL]              = { .type = NLA_U32 },
 152         [BATADV_ATTR_THROUGHPUT_OVERRIDE]       = { .type = NLA_U32 },
 153 };
 154
 155 /**
 156  * batadv_netlink_get_ifindex() - Extract an interface index from a message
 157  * @nlh: Message header
 158  * @attrtype: Attribute which holds an interface index
 159  *
 160  * Return: interface index, or 0.
 161  */
 162 int
 163 batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
 164 {
 165         struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
 166
 167         return (attr && nla_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0;
 168 }
 169
 170 /**
 171  * batadv_netlink_mesh_fill_ap_isolation() - Add ap_isolation softif attribute
 172  * @msg: Netlink message to dump into
 173  * @bat_priv: the bat priv with all the soft interface information
 174  *
 175  * Return: 0 on success or negative error number in case of failure
 176  */
 177 static int batadv_netlink_mesh_fill_ap_isolation(struct sk_buff *msg,
 178                                                  struct batadv_priv *bat_priv)
 179 {
 180         struct batadv_softif_vlan *vlan;
 181         u8 ap_isolation;
 182
 183         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
 184         if (!vlan)
 185                 return 0;
 186
 187         ap_isolation = atomic_read(&vlan->ap_isolation);
 188         batadv_softif_vlan_put(vlan);
 189
 190         return nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
 191                           !!ap_isolation);
 192 }
 193
 194 /**
 195  * batadv_option_set_ap_isolation() - Set ap_isolation from genl msg
 196  * @attr: parsed BATADV_ATTR_AP_ISOLATION_ENABLED attribute
 197  * @bat_priv: the bat priv with all the soft interface information
 198  *
 199  * Return: 0 on success or negative error number in case of failure
 200  */
 201 static int batadv_netlink_set_mesh_ap_isolation(struct nlattr *attr,
 202                                                 struct batadv_priv *bat_priv)
 203 {
 204         struct batadv_softif_vlan *vlan;
 205
 206         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
 207         if (!vlan)
 208                 return -ENOENT;
 209
 210         atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
 211         batadv_softif_vlan_put(vlan);
 212
 213         return 0;
 214 }
 215
 216 /**
 217  * batadv_netlink_mesh_fill() - Fill message with mesh attributes
 218  * @msg: Netlink message to dump into
 219  * @bat_priv: the bat priv with all the soft interface information
 220  * @cmd: type of message to generate
 221  * @portid: Port making netlink request
 222  * @seq: sequence number for message
 223  * @flags: Additional flags for message
 224  *
 225  * Return: 0 on success or negative error number in case of failure
 226  */
 227 static int batadv_netlink_mesh_fill(struct sk_buff *msg,
 228                                     struct batadv_priv *bat_priv,
 229                                     enum batadv_nl_commands cmd,
 230                                     u32 portid, u32 seq, int flags)
 231 {
 232         struct net_device *soft_iface = bat_priv->soft_iface;
 233         struct batadv_hard_iface *primary_if = NULL;
 234         struct net_device *hard_iface;
 235         void *hdr;
 236
 237         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
 238         if (!hdr)
 239                 return -ENOBUFS;
 240
 241         if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
 242             nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
 243                            bat_priv->algo_ops->name) ||
 244             nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
 245             nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
 246             nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
 247                     soft_iface->dev_addr) ||
 248             nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
 249                        (u8)atomic_read(&bat_priv->tt.vn)))
 250                 goto nla_put_failure;
 251
 252 #ifdef CONFIG_BATMAN_ADV_BLA
 253         if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
 254                         ntohs(bat_priv->bla.claim_dest.group)))
 255                 goto nla_put_failure;
 256 #endif
 257
 258         if (batadv_mcast_mesh_info_put(msg, bat_priv))
 259                 goto nla_put_failure;
 260
 261         primary_if = batadv_primary_if_get_selected(bat_priv);
 262         if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
 263                 hard_iface = primary_if->net_dev;
 264
 265                 if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 266                                 hard_iface->ifindex) ||
 267                     nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
 268                                    hard_iface->name) ||
 269                     nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
 270                             hard_iface->dev_addr))
 271                         goto nla_put_failure;
 272         }
 273
 274         if (nla_put_u8(msg, BATADV_ATTR_AGGREGATED_OGMS_ENABLED,
 275                        !!atomic_read(&bat_priv->aggregated_ogms)))
 276                 goto nla_put_failure;
 277
 278         if (batadv_netlink_mesh_fill_ap_isolation(msg, bat_priv))
 279                 goto nla_put_failure;
 280
 281         if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK,
 282                         bat_priv->isolation_mark))
 283                 goto nla_put_failure;
 284
 285         if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK,
 286                         bat_priv->isolation_mark_mask))
 287                 goto nla_put_failure;
 288
 289         if (nla_put_u8(msg, BATADV_ATTR_BONDING_ENABLED,
 290                        !!atomic_read(&bat_priv->bonding)))
 291                 goto nla_put_failure;
 292
 293 #ifdef CONFIG_BATMAN_ADV_BLA
 294         if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED,
 295                        !!atomic_read(&bat_priv->bridge_loop_avoidance)))
 296                 goto nla_put_failure;
 297 #endif /* CONFIG_BATMAN_ADV_BLA */
 298
 299 #ifdef CONFIG_BATMAN_ADV_DAT
 300         if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED,
 301                        !!atomic_read(&bat_priv->distributed_arp_table)))
 302                 goto nla_put_failure;
 303 #endif /* CONFIG_BATMAN_ADV_DAT */
 304
 305         if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED,
 306                        !!atomic_read(&bat_priv->fragmentation)))
 307                 goto nla_put_failure;
 308
 309         if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN,
 310                         atomic_read(&bat_priv->gw.bandwidth_down)))
 311                 goto nla_put_failure;
 312
 313         if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP,
 314                         atomic_read(&bat_priv->gw.bandwidth_up)))
 315                 goto nla_put_failure;
 316
 317         if (nla_put_u8(msg, BATADV_ATTR_GW_MODE,
 318                        atomic_read(&bat_priv->gw.mode)))
 319                 goto nla_put_failure;
 320
 321         if (bat_priv->algo_ops->gw.get_best_gw_node &&
 322             bat_priv->algo_ops->gw.is_eligible) {
 323                 /* GW selection class is not available if the routing algorithm
 324                  * in use does not implement the GW API
 325                  */
 326                 if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS,
 327                                 atomic_read(&bat_priv->gw.sel_class)))
 328                         goto nla_put_failure;
 329         }
 330
 331         if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
 332                        atomic_read(&bat_priv->hop_penalty)))
 333                 goto nla_put_failure;
 334
 335 #ifdef CONFIG_BATMAN_ADV_DEBUG
 336         if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL,
 337                         atomic_read(&bat_priv->log_level)))
 338                 goto nla_put_failure;
 339 #endif /* CONFIG_BATMAN_ADV_DEBUG */
 340
 341 #ifdef CONFIG_BATMAN_ADV_MCAST
 342         if (nla_put_u8(msg, BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED,
 343                        !atomic_read(&bat_priv->multicast_mode)))
 344                 goto nla_put_failure;
 345
 346         if (nla_put_u32(msg, BATADV_ATTR_MULTICAST_FANOUT,
 347                         atomic_read(&bat_priv->multicast_fanout)))
 348                 goto nla_put_failure;
 349 #endif /* CONFIG_BATMAN_ADV_MCAST */
 350
 351 #ifdef CONFIG_BATMAN_ADV_NC
 352         if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED,
 353                        !!atomic_read(&bat_priv->network_coding)))
 354                 goto nla_put_failure;
 355 #endif /* CONFIG_BATMAN_ADV_NC */
 356
 357         if (nla_put_u32(msg, BATADV_ATTR_ORIG_INTERVAL,
 358                         atomic_read(&bat_priv->orig_interval)))
 359                 goto nla_put_failure;
 360
 361         if (primary_if)
 362                 batadv_hardif_put(primary_if);
 363
 364         genlmsg_end(msg, hdr);
 365         return 0;
 366
 367 nla_put_failure:
 368         if (primary_if)
 369                 batadv_hardif_put(primary_if);
 370
 371         genlmsg_cancel(msg, hdr);
 372         return -EMSGSIZE;
 373 }
 374
 375 /**
 376  * batadv_netlink_notify_mesh() - send softif attributes to listener
 377  * @bat_priv: the bat priv with all the soft interface information
 378  *
 379  * Return: 0 on success, < 0 on error
 380  */
 381 int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
 382 {
 383         struct sk_buff *msg;
 384         int ret;
 385
 386         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 387         if (!msg)
 388                 return -ENOMEM;
 389
 390         ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_SET_MESH,
 391                                        0, 0, 0);
 392         if (ret < 0) {
 393                 nlmsg_free(msg);
 394                 return ret;
 395         }
 396
 397         genlmsg_multicast_netns(&batadv_netlink_family,
 398                                 dev_net(bat_priv->soft_iface), msg, 0,
 399                                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
 400
 401         return 0;
 402 }
 403
 404 /**
 405  * batadv_netlink_get_mesh() - Get softif attributes
 406  * @skb: Netlink message with request data
 407  * @info: receiver information
 408  *
 409  * Return: 0 on success or negative error number in case of failure
 410  */
 411 static int batadv_netlink_get_mesh(struct sk_buff *skb, struct genl_info *info)
 412 {
 413         struct batadv_priv *bat_priv = info->user_ptr[0];
 414         struct sk_buff *msg;
 415         int ret;
 416
 417         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 418         if (!msg)
 419                 return -ENOMEM;
 420
 421         ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_GET_MESH,
 422                                        info->snd_portid, info->snd_seq, 0);
 423         if (ret < 0) {
 424                 nlmsg_free(msg);
 425                 return ret;
 426         }
 427
 428         ret = genlmsg_reply(msg, info);
 429
 430         return ret;
 431 }
 432
 433 /**
 434  * batadv_netlink_set_mesh() - Set softif attributes
 435  * @skb: Netlink message with request data
 436  * @info: receiver information
 437  *
 438  * Return: 0 on success or negative error number in case of failure
 439  */
 440 static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
 441 {
 442         struct batadv_priv *bat_priv = info->user_ptr[0];
 443         struct nlattr *attr;
 444
 445         if (info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]) {
 446                 attr = info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED];
 447
 448                 atomic_set(&bat_priv->aggregated_ogms, !!nla_get_u8(attr));
 449         }
 450
 451         if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
 452                 attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
 453
 454                 batadv_netlink_set_mesh_ap_isolation(attr, bat_priv);
 455         }
 456
 457         if (info->attrs[BATADV_ATTR_ISOLATION_MARK]) {
 458                 attr = info->attrs[BATADV_ATTR_ISOLATION_MARK];
 459
 460                 bat_priv->isolation_mark = nla_get_u32(attr);
 461         }
 462
 463         if (info->attrs[BATADV_ATTR_ISOLATION_MASK]) {
 464                 attr = info->attrs[BATADV_ATTR_ISOLATION_MASK];
 465
 466                 bat_priv->isolation_mark_mask = nla_get_u32(attr);
 467         }
 468
 469         if (info->attrs[BATADV_ATTR_BONDING_ENABLED]) {
 470                 attr = info->attrs[BATADV_ATTR_BONDING_ENABLED];
 471
 472                 atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
 473         }
 474
 475 #ifdef CONFIG_BATMAN_ADV_BLA
 476         if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]) {
 477                 attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED];
 478
 479                 atomic_set(&bat_priv->bridge_loop_avoidance,
 480                            !!nla_get_u8(attr));
 481                 batadv_bla_status_update(bat_priv->soft_iface);
 482         }
 483 #endif /* CONFIG_BATMAN_ADV_BLA */
 484
 485 #ifdef CONFIG_BATMAN_ADV_DAT
 486         if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]) {
 487                 attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED];
 488
 489                 atomic_set(&bat_priv->distributed_arp_table,
 490                            !!nla_get_u8(attr));
 491                 batadv_dat_status_update(bat_priv->soft_iface);
 492         }
 493 #endif /* CONFIG_BATMAN_ADV_DAT */
 494
 495         if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) {
 496                 attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED];
 497
 498                 atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr));
 499                 batadv_update_min_mtu(bat_priv->soft_iface);
 500         }
 501
 502         if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) {
 503                 attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN];
 504
 505                 atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr));
 506                 batadv_gw_tvlv_container_update(bat_priv);
 507         }
 508
 509         if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) {
 510                 attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP];
 511
 512                 atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr));
 513                 batadv_gw_tvlv_container_update(bat_priv);
 514         }
 515
 516         if (info->attrs[BATADV_ATTR_GW_MODE]) {
 517                 u8 gw_mode;
 518
 519                 attr = info->attrs[BATADV_ATTR_GW_MODE];
 520                 gw_mode = nla_get_u8(attr);
 521
 522                 if (gw_mode <= BATADV_GW_MODE_SERVER) {
 523                         /* Invoking batadv_gw_reselect() is not enough to really
 524                          * de-select the current GW. It will only instruct the
 525                          * gateway client code to perform a re-election the next
 526                          * time that this is needed.
 527                          *
 528                          * When gw client mode is being switched off the current
 529                          * GW must be de-selected explicitly otherwise no GW_ADD
 530                          * uevent is thrown on client mode re-activation. This
 531                          * is operation is performed in
 532                          * batadv_gw_check_client_stop().
 533                          */
 534                         batadv_gw_reselect(bat_priv);
 535
 536                         /* always call batadv_gw_check_client_stop() before
 537                          * changing the gateway state
 538                          */
 539                         batadv_gw_check_client_stop(bat_priv);
 540                         atomic_set(&bat_priv->gw.mode, gw_mode);
 541                         batadv_gw_tvlv_container_update(bat_priv);
 542                 }
 543         }
 544
 545         if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] &&
 546             bat_priv->algo_ops->gw.get_best_gw_node &&
 547             bat_priv->algo_ops->gw.is_eligible) {
 548                 /* setting the GW selection class is allowed only if the routing
 549                  * algorithm in use implements the GW API
 550                  */
 551
 552                 u32 sel_class_max = 0xffffffffu;
 553                 u32 sel_class;
 554
 555                 attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
 556                 sel_class = nla_get_u32(attr);
 557
 558                 if (!bat_priv->algo_ops->gw.store_sel_class)
 559                         sel_class_max = BATADV_TQ_MAX_VALUE;
 560
 561                 if (sel_class >= 1 && sel_class <= sel_class_max) {
 562                         atomic_set(&bat_priv->gw.sel_class, sel_class);
 563                         batadv_gw_reselect(bat_priv);
 564                 }
 565         }
 566
 567         if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
 568                 attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
 569
 570                 atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr));
 571         }
 572
 573 #ifdef CONFIG_BATMAN_ADV_DEBUG
 574         if (info->attrs[BATADV_ATTR_LOG_LEVEL]) {
 575                 attr = info->attrs[BATADV_ATTR_LOG_LEVEL];
 576
 577                 atomic_set(&bat_priv->log_level,
 578                            nla_get_u32(attr) & BATADV_DBG_ALL);
 579         }
 580 #endif /* CONFIG_BATMAN_ADV_DEBUG */
 581
 582 #ifdef CONFIG_BATMAN_ADV_MCAST
 583         if (info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]) {
 584                 attr = info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED];
 585
 586                 atomic_set(&bat_priv->multicast_mode, !nla_get_u8(attr));
 587         }
 588
 589         if (info->attrs[BATADV_ATTR_MULTICAST_FANOUT]) {
 590                 attr = info->attrs[BATADV_ATTR_MULTICAST_FANOUT];
 591
 592                 atomic_set(&bat_priv->multicast_fanout, nla_get_u32(attr));
 593         }
 594 #endif /* CONFIG_BATMAN_ADV_MCAST */
 595
 596 #ifdef CONFIG_BATMAN_ADV_NC
 597         if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) {
 598                 attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED];
 599
 600                 atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr));
 601                 batadv_nc_status_update(bat_priv->soft_iface);
 602         }
 603 #endif /* CONFIG_BATMAN_ADV_NC */
 604
 605         if (info->attrs[BATADV_ATTR_ORIG_INTERVAL]) {
 606                 u32 orig_interval;
 607
 608                 attr = info->attrs[BATADV_ATTR_ORIG_INTERVAL];
 609                 orig_interval = nla_get_u32(attr);
 610
 611                 orig_interval = min_t(u32, orig_interval, INT_MAX);
 612                 orig_interval = max_t(u32, orig_interval, 2 * BATADV_JITTER);
 613
 614                 atomic_set(&bat_priv->orig_interval, orig_interval);
 615         }
 616
 617         batadv_netlink_notify_mesh(bat_priv);
 618
 619         return 0;
 620 }
 621
 622 /**
 623  * batadv_netlink_tp_meter_put() - Fill information of started tp_meter session
 624  * @msg: netlink message to be sent back
 625  * @cookie: tp meter session cookie
 626  *
 627  *  Return: 0 on success, < 0 on error
 628  */
 629 static int
 630 batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
 631 {
 632         if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
 633                 return -ENOBUFS;
 634
 635         return 0;
 636 }
 637
 638 /**
 639  * batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client
 640  * @bat_priv: the bat priv with all the soft interface information
 641  * @dst: destination of tp_meter session
 642  * @result: reason for tp meter session stop
 643  * @test_time: total time of the tp_meter session
 644  * @total_bytes: bytes acked to the receiver
 645  * @cookie: cookie of tp_meter session
 646  *
 647  * Return: 0 on success, < 0 on error
 648  */
 649 int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
 650                                   u8 result, u32 test_time, u64 total_bytes,
 651                                   u32 cookie)
 652 {
 653         struct sk_buff *msg;
 654         void *hdr;
 655         int ret;
 656
 657         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 658         if (!msg)
 659                 return -ENOMEM;
 660
 661         hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
 662                           BATADV_CMD_TP_METER);
 663         if (!hdr) {
 664                 ret = -ENOBUFS;
 665                 goto err_genlmsg;
 666         }
 667
 668         if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
 669                 goto nla_put_failure;
 670
 671         if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
 672                 goto nla_put_failure;
 673
 674         if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
 675                               BATADV_ATTR_PAD))
 676                 goto nla_put_failure;
 677
 678         if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
 679                 goto nla_put_failure;
 680
 681         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
 682                 goto nla_put_failure;
 683
 684         genlmsg_end(msg, hdr);
 685
 686         genlmsg_multicast_netns(&batadv_netlink_family,
 687                                 dev_net(bat_priv->soft_iface), msg, 0,
 688                                 BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
 689
 690         return 0;
 691
 692 nla_put_failure:
 693         genlmsg_cancel(msg, hdr);
 694         ret = -EMSGSIZE;
 695
 696 err_genlmsg:
 697         nlmsg_free(msg);
 698         return ret;
 699 }
 700
 701 /**
 702  * batadv_netlink_tp_meter_start() - Start a new tp_meter session
 703  * @skb: received netlink message
 704  * @info: receiver information
 705  *
 706  * Return: 0 on success, < 0 on error
 707  */
 708 static int
 709 batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
 710 {
 711         struct batadv_priv *bat_priv = info->user_ptr[0];
 712         struct sk_buff *msg = NULL;
 713         u32 test_length;
 714         void *msg_head;
 715         u32 cookie;
 716         u8 *dst;
 717         int ret;
 718
 719         if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
 720                 return -EINVAL;
 721
 722         if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
 723                 return -EINVAL;
 724
 725         dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
 726
 727         test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
 728
 729         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 730         if (!msg) {
 731                 ret = -ENOMEM;
 732                 goto out;
 733         }
 734
 735         msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
 736                                &batadv_netlink_family, 0,
 737                                BATADV_CMD_TP_METER);
 738         if (!msg_head) {
 739                 ret = -ENOBUFS;
 740                 goto out;
 741         }
 742
 743         batadv_tp_start(bat_priv, dst, test_length, &cookie);
 744
 745         ret = batadv_netlink_tp_meter_put(msg, cookie);
 746
 747  out:
 748         if (ret) {
 749                 if (msg)
 750                         nlmsg_free(msg);
 751                 return ret;
 752         }
 753
 754         genlmsg_end(msg, msg_head);
 755         return genlmsg_reply(msg, info);
 756 }
 757
 758 /**
 759  * batadv_netlink_tp_meter_start() - Cancel a running tp_meter session
 760  * @skb: received netlink message
 761  * @info: receiver information
 762  *
 763  * Return: 0 on success, < 0 on error
 764  */
 765 static int
 766 batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
 767 {
 768         struct batadv_priv *bat_priv = info->user_ptr[0];
 769         u8 *dst;
 770         int ret = 0;
 771
 772         if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
 773                 return -EINVAL;
 774
 775         dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
 776
 777         batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
 778
 779         return ret;
 780 }
 781
 782 /**
 783  * batadv_netlink_hardif_fill() - Fill message with hardif attributes
 784  * @msg: Netlink message to dump into
 785  * @bat_priv: the bat priv with all the soft interface information
 786  * @hard_iface: hard interface which was modified
 787  * @cmd: type of message to generate
 788  * @portid: Port making netlink request
 789  * @seq: sequence number for message
 790  * @flags: Additional flags for message
 791  * @cb: Control block containing additional options
 792  *
 793  * Return: 0 on success or negative error number in case of failure
 794  */
 795 static int batadv_netlink_hardif_fill(struct sk_buff *msg,
 796                                       struct batadv_priv *bat_priv,
 797                                       struct batadv_hard_iface *hard_iface,
 798                                       enum batadv_nl_commands cmd,
 799                                       u32 portid, u32 seq, int flags,
 800                                       struct netlink_callback *cb)
 801 {
 802         struct net_device *net_dev = hard_iface->net_dev;
 803         void *hdr;
 804
 805         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
 806         if (!hdr)
 807                 return -ENOBUFS;
 808
 809         if (cb)
 810                 genl_dump_check_consistent(cb, hdr);
 811
 812         if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
 813                         bat_priv->soft_iface->ifindex))
 814                 goto nla_put_failure;
 815
 816         if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 817                         net_dev->ifindex) ||
 818             nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
 819                            net_dev->name) ||
 820             nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
 821                     net_dev->dev_addr))
 822                 goto nla_put_failure;
 823
 824         if (hard_iface->if_status == BATADV_IF_ACTIVE) {
 825                 if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
 826                         goto nla_put_failure;
 827         }
 828
 829         if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
 830                        atomic_read(&hard_iface->hop_penalty)))
 831                 goto nla_put_failure;
 832
 833 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 834         if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL,
 835                         atomic_read(&hard_iface->bat_v.elp_interval)))
 836                 goto nla_put_failure;
 837
 838         if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT_OVERRIDE,
 839                         atomic_read(&hard_iface->bat_v.throughput_override)))
 840                 goto nla_put_failure;
 841 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
 842
 843         genlmsg_end(msg, hdr);
 844         return 0;
 845
 846 nla_put_failure:
 847         genlmsg_cancel(msg, hdr);
 848         return -EMSGSIZE;
 849 }
 850
 851 /**
 852  * batadv_netlink_notify_hardif() - send hardif attributes to listener
 853  * @bat_priv: the bat priv with all the soft interface information
 854  * @hard_iface: hard interface which was modified
 855  *
 856  * Return: 0 on success, < 0 on error
 857  */
 858 int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
 859                                  struct batadv_hard_iface *hard_iface)
 860 {
 861         struct sk_buff *msg;
 862         int ret;
 863
 864         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 865         if (!msg)
 866                 return -ENOMEM;
 867
 868         ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
 869                                          BATADV_CMD_SET_HARDIF, 0, 0, 0, NULL);
 870         if (ret < 0) {
 871                 nlmsg_free(msg);
 872                 return ret;
 873         }
 874
 875         genlmsg_multicast_netns(&batadv_netlink_family,
 876                                 dev_net(bat_priv->soft_iface), msg, 0,
 877                                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
 878
 879         return 0;
 880 }
 881
 882 /**
 883  * batadv_netlink_get_hardif() - Get hardif attributes
 884  * @skb: Netlink message with request data
 885  * @info: receiver information
 886  *
 887  * Return: 0 on success or negative error number in case of failure
 888  */
 889 static int batadv_netlink_get_hardif(struct sk_buff *skb,
 890                                      struct genl_info *info)
 891 {
 892         struct batadv_hard_iface *hard_iface = info->user_ptr[1];
 893         struct batadv_priv *bat_priv = info->user_ptr[0];
 894         struct sk_buff *msg;
 895         int ret;
 896
 897         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 898         if (!msg)
 899                 return -ENOMEM;
 900
 901         ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
 902                                          BATADV_CMD_GET_HARDIF,
 903                                          info->snd_portid, info->snd_seq, 0,
 904                                          NULL);
 905         if (ret < 0) {
 906                 nlmsg_free(msg);
 907                 return ret;
 908         }
 909
 910         ret = genlmsg_reply(msg, info);
 911
 912         return ret;
 913 }
 914
 915 /**
 916  * batadv_netlink_set_hardif() - Set hardif attributes
 917  * @skb: Netlink message with request data
 918  * @info: receiver information
 919  *
 920  * Return: 0 on success or negative error number in case of failure
 921  */
 922 static int batadv_netlink_set_hardif(struct sk_buff *skb,
 923                                      struct genl_info *info)
 924 {
 925         struct batadv_hard_iface *hard_iface = info->user_ptr[1];
 926         struct batadv_priv *bat_priv = info->user_ptr[0];
 927         struct nlattr *attr;
 928
 929         if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
 930                 attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
 931
 932                 atomic_set(&hard_iface->hop_penalty, nla_get_u8(attr));
 933         }
 934
 935 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 936
 937         if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) {
 938                 attr = info->attrs[BATADV_ATTR_ELP_INTERVAL];
 939
 940                 atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr));
 941         }
 942
 943         if (info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]) {
 944                 attr = info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE];
 945
 946                 atomic_set(&hard_iface->bat_v.throughput_override,
 947                            nla_get_u32(attr));
 948         }
 949 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
 950
 951         batadv_netlink_notify_hardif(bat_priv, hard_iface);
 952
 953         return 0;
 954 }
 955
 956 /**
 957  * batadv_netlink_dump_hardif() - Dump all hard interface into a messages
 958  * @msg: Netlink message to dump into
 959  * @cb: Parameters from query
 960  *
 961  * Return: error code, or length of reply message on success
 962  */
 963 static int
 964 batadv_netlink_dump_hardif(struct sk_buff *msg, struct netlink_callback *cb)
 965 {
 966         struct net *net = sock_net(cb->skb->sk);
 967         struct net_device *soft_iface;
 968         struct batadv_hard_iface *hard_iface;
 969         struct batadv_priv *bat_priv;
 970         int ifindex;
 971         int portid = NETLINK_CB(cb->skb).portid;
 972         int skip = cb->args[0];
 973         int i = 0;
 974
 975         ifindex = batadv_netlink_get_ifindex(cb->nlh,
 976                                              BATADV_ATTR_MESH_IFINDEX);
 977         if (!ifindex)
 978                 return -EINVAL;
 979
 980         soft_iface = dev_get_by_index(net, ifindex);
 981         if (!soft_iface)
 982                 return -ENODEV;
 983
 984         if (!batadv_softif_is_valid(soft_iface)) {
 985                 dev_put(soft_iface);
 986                 return -ENODEV;
 987         }
 988
 989         bat_priv = netdev_priv(soft_iface);
 990
 991         rtnl_lock();
 992         cb->seq = batadv_hardif_generation << 1 | 1;
 993
 994         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 995                 if (hard_iface->soft_iface != soft_iface)
 996                         continue;
 997
 998                 if (i++ < skip)
 999                         continue;
1000
1001                 if (batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
1002                                                BATADV_CMD_GET_HARDIF,
1003                                                portid, cb->nlh->nlmsg_seq,
1004                                                NLM_F_MULTI, cb)) {
1005                         i--;
1006                         break;
1007                 }
1008         }
1009
1010         rtnl_unlock();
1011
1012         dev_put(soft_iface);
1013
1014         cb->args[0] = i;
1015
1016         return msg->len;
1017 }
1018
1019 /**
1020  * batadv_netlink_vlan_fill() - Fill message with vlan attributes
1021  * @msg: Netlink message to dump into
1022  * @bat_priv: the bat priv with all the soft interface information
1023  * @vlan: vlan which was modified
1024  * @cmd: type of message to generate
1025  * @portid: Port making netlink request
1026  * @seq: sequence number for message
1027  * @flags: Additional flags for message
1028  *
1029  * Return: 0 on success or negative error number in case of failure
1030  */
1031 static int batadv_netlink_vlan_fill(struct sk_buff *msg,
1032                                     struct batadv_priv *bat_priv,
1033                                     struct batadv_softif_vlan *vlan,
1034                                     enum batadv_nl_commands cmd,
1035                                     u32 portid, u32 seq, int flags)
1036 {
1037         void *hdr;
1038
1039         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
1040         if (!hdr)
1041                 return -ENOBUFS;
1042
1043         if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
1044                         bat_priv->soft_iface->ifindex))
1045                 goto nla_put_failure;
1046
1047         if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
1048                 goto nla_put_failure;
1049
1050         if (nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
1051                        !!atomic_read(&vlan->ap_isolation)))
1052                 goto nla_put_failure;
1053
1054         genlmsg_end(msg, hdr);
1055         return 0;
1056
1057 nla_put_failure:
1058         genlmsg_cancel(msg, hdr);
1059         return -EMSGSIZE;
1060 }
1061
1062 /**
1063  * batadv_netlink_notify_vlan() - send vlan attributes to listener
1064  * @bat_priv: the bat priv with all the soft interface information
1065  * @vlan: vlan which was modified
1066  *
1067  * Return: 0 on success, < 0 on error
1068  */
1069 int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
1070                                struct batadv_softif_vlan *vlan)
1071 {
1072         struct sk_buff *msg;
1073         int ret;
1074
1075         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1076         if (!msg)
1077                 return -ENOMEM;
1078
1079         ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan,
1080                                        BATADV_CMD_SET_VLAN, 0, 0, 0);
1081         if (ret < 0) {
1082                 nlmsg_free(msg);
1083                 return ret;
1084         }
1085
1086         genlmsg_multicast_netns(&batadv_netlink_family,
1087                                 dev_net(bat_priv->soft_iface), msg, 0,
1088                                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
1089
1090         return 0;
1091 }
1092
1093 /**
1094  * batadv_netlink_get_vlan() - Get vlan attributes
1095  * @skb: Netlink message with request data
1096  * @info: receiver information
1097  *
1098  * Return: 0 on success or negative error number in case of failure
1099  */
1100 static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info)
1101 {
1102         struct batadv_softif_vlan *vlan = info->user_ptr[1];
1103         struct batadv_priv *bat_priv = info->user_ptr[0];
1104         struct sk_buff *msg;
1105         int ret;
1106
1107         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1108         if (!msg)
1109                 return -ENOMEM;
1110
1111         ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
1112                                        info->snd_portid, info->snd_seq, 0);
1113         if (ret < 0) {
1114                 nlmsg_free(msg);
1115                 return ret;
1116         }
1117
1118         ret = genlmsg_reply(msg, info);
1119
1120         return ret;
1121 }
1122
1123 /**
1124  * batadv_netlink_set_vlan() - Get vlan attributes
1125  * @skb: Netlink message with request data
1126  * @info: receiver information
1127  *
1128  * Return: 0 on success or negative error number in case of failure
1129  */
1130 static int batadv_netlink_set_vlan(struct sk_buff *skb, struct genl_info *info)
1131 {
1132         struct batadv_softif_vlan *vlan = info->user_ptr[1];
1133         struct batadv_priv *bat_priv = info->user_ptr[0];
1134         struct nlattr *attr;
1135
1136         if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
1137                 attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
1138
1139                 atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
1140         }
1141
1142         batadv_netlink_notify_vlan(bat_priv, vlan);
1143
1144         return 0;
1145 }
1146
1147 /**
1148  * batadv_get_softif_from_info() - Retrieve soft interface from genl attributes
1149  * @net: the applicable net namespace
1150  * @info: receiver information
1151  *
1152  * Return: Pointer to soft interface (with increased refcnt) on success, error
1153  *  pointer on error
1154  */
1155 static struct net_device *
1156 batadv_get_softif_from_info(struct net *net, struct genl_info *info)
1157 {
1158         struct net_device *soft_iface;
1159         int ifindex;
1160
1161         if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
1162                 return ERR_PTR(-EINVAL);
1163
1164         ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
1165
1166         soft_iface = dev_get_by_index(net, ifindex);
1167         if (!soft_iface)
1168                 return ERR_PTR(-ENODEV);
1169
1170         if (!batadv_softif_is_valid(soft_iface))
1171                 goto err_put_softif;
1172
1173         return soft_iface;
1174
1175 err_put_softif:
1176         dev_put(soft_iface);
1177
1178         return ERR_PTR(-EINVAL);
1179 }
1180
1181 /**
1182  * batadv_get_hardif_from_info() - Retrieve hardif from genl attributes
1183  * @bat_priv: the bat priv with all the soft interface information
1184  * @net: the applicable net namespace
1185  * @info: receiver information
1186  *
1187  * Return: Pointer to hard interface (with increased refcnt) on success, error
1188  *  pointer on error
1189  */
1190 static struct batadv_hard_iface *
1191 batadv_get_hardif_from_info(struct batadv_priv *bat_priv, struct net *net,
1192                             struct genl_info *info)
1193 {
1194         struct batadv_hard_iface *hard_iface;
1195         struct net_device *hard_dev;
1196         unsigned int hardif_index;
1197
1198         if (!info->attrs[BATADV_ATTR_HARD_IFINDEX])
1199                 return ERR_PTR(-EINVAL);
1200
1201         hardif_index = nla_get_u32(info->attrs[BATADV_ATTR_HARD_IFINDEX]);
1202
1203         hard_dev = dev_get_by_index(net, hardif_index);
1204         if (!hard_dev)
1205                 return ERR_PTR(-ENODEV);
1206
1207         hard_iface = batadv_hardif_get_by_netdev(hard_dev);
1208         if (!hard_iface)
1209                 goto err_put_harddev;
1210
1211         if (hard_iface->soft_iface != bat_priv->soft_iface)
1212                 goto err_put_hardif;
1213
1214         /* hard_dev is referenced by hard_iface and not needed here */
1215         dev_put(hard_dev);
1216
1217         return hard_iface;
1218
1219 err_put_hardif:
1220         batadv_hardif_put(hard_iface);
1221 err_put_harddev:
1222         dev_put(hard_dev);
1223
1224         return ERR_PTR(-EINVAL);
1225 }
1226
1227 /**
1228  * batadv_get_vlan_from_info() - Retrieve vlan from genl attributes
1229  * @bat_priv: the bat priv with all the soft interface information
1230  * @net: the applicable net namespace
1231  * @info: receiver information
1232  *
1233  * Return: Pointer to vlan on success (with increased refcnt), error pointer
1234  *  on error
1235  */
1236 static struct batadv_softif_vlan *
1237 batadv_get_vlan_from_info(struct batadv_priv *bat_priv, struct net *net,
1238                           struct genl_info *info)
1239 {
1240         struct batadv_softif_vlan *vlan;
1241         u16 vid;
1242
1243         if (!info->attrs[BATADV_ATTR_VLANID])
1244                 return ERR_PTR(-EINVAL);
1245
1246         vid = nla_get_u16(info->attrs[BATADV_ATTR_VLANID]);
1247
1248         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
1249         if (!vlan)
1250                 return ERR_PTR(-ENOENT);
1251
1252         return vlan;
1253 }
1254
1255 /**
1256  * batadv_pre_doit() - Prepare batman-adv genl doit request
1257  * @ops: requested netlink operation
1258  * @skb: Netlink message with request data
1259  * @info: receiver information
1260  *
1261  * Return: 0 on success or negative error number in case of failure
1262  */
1263 static int batadv_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
1264                            struct genl_info *info)
1265 {
1266         struct net *net = genl_info_net(info);
1267         struct batadv_hard_iface *hard_iface;
1268         struct batadv_priv *bat_priv = NULL;
1269         struct batadv_softif_vlan *vlan;
1270         struct net_device *soft_iface;
1271         u8 user_ptr1_flags;
1272         u8 mesh_dep_flags;
1273         int ret;
1274
1275         user_ptr1_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1276         if (WARN_ON(hweight8(ops->internal_flags & user_ptr1_flags) > 1))
1277                 return -EINVAL;
1278
1279         mesh_dep_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1280         if (WARN_ON((ops->internal_flags & mesh_dep_flags) &&
1281                     (~ops->internal_flags & BATADV_FLAG_NEED_MESH)))
1282                 return -EINVAL;
1283
1284         if (ops->internal_flags & BATADV_FLAG_NEED_MESH) {
1285                 soft_iface = batadv_get_softif_from_info(net, info);
1286                 if (IS_ERR(soft_iface))
1287                         return PTR_ERR(soft_iface);
1288
1289                 bat_priv = netdev_priv(soft_iface);
1290                 info->user_ptr[0] = bat_priv;
1291         }
1292
1293         if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF) {
1294                 hard_iface = batadv_get_hardif_from_info(bat_priv, net, info);
1295                 if (IS_ERR(hard_iface)) {
1296                         ret = PTR_ERR(hard_iface);
1297                         goto err_put_softif;
1298                 }
1299
1300                 info->user_ptr[1] = hard_iface;
1301         }
1302
1303         if (ops->internal_flags & BATADV_FLAG_NEED_VLAN) {
1304                 vlan = batadv_get_vlan_from_info(bat_priv, net, info);
1305                 if (IS_ERR(vlan)) {
1306                         ret = PTR_ERR(vlan);
1307                         goto err_put_softif;
1308                 }
1309
1310                 info->user_ptr[1] = vlan;
1311         }
1312
1313         return 0;
1314
1315 err_put_softif:
1316         if (bat_priv)
1317                 dev_put(bat_priv->soft_iface);
1318
1319         return ret;
1320 }
1321
1322 /**
1323  * batadv_post_doit() - End batman-adv genl doit request
1324  * @ops: requested netlink operation
1325  * @skb: Netlink message with request data
1326  * @info: receiver information
1327  */
1328 static void batadv_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
1329                              struct genl_info *info)
1330 {
1331         struct batadv_hard_iface *hard_iface;
1332         struct batadv_softif_vlan *vlan;
1333         struct batadv_priv *bat_priv;
1334
1335         if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF &&
1336             info->user_ptr[1]) {
1337                 hard_iface = info->user_ptr[1];
1338
1339                 batadv_hardif_put(hard_iface);
1340         }
1341
1342         if (ops->internal_flags & BATADV_FLAG_NEED_VLAN && info->user_ptr[1]) {
1343                 vlan = info->user_ptr[1];
1344                 batadv_softif_vlan_put(vlan);
1345         }
1346
1347         if (ops->internal_flags & BATADV_FLAG_NEED_MESH && info->user_ptr[0]) {
1348                 bat_priv = info->user_ptr[0];
1349                 dev_put(bat_priv->soft_iface);
1350         }
1351 }
1352
1353 static const struct genl_small_ops batadv_netlink_ops[] = {
1354         {
1355                 .cmd = BATADV_CMD_GET_MESH,
1356                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1357                 /* can be retrieved by unprivileged users */
1358                 .doit = batadv_netlink_get_mesh,
1359                 .internal_flags = BATADV_FLAG_NEED_MESH,
1360         },
1361         {
1362                 .cmd = BATADV_CMD_TP_METER,
1363                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1364                 .flags = GENL_ADMIN_PERM,
1365                 .doit = batadv_netlink_tp_meter_start,
1366                 .internal_flags = BATADV_FLAG_NEED_MESH,
1367         },
1368         {
1369                 .cmd = BATADV_CMD_TP_METER_CANCEL,
1370                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1371                 .flags = GENL_ADMIN_PERM,
1372                 .doit = batadv_netlink_tp_meter_cancel,
1373                 .internal_flags = BATADV_FLAG_NEED_MESH,
1374         },
1375         {
1376                 .cmd = BATADV_CMD_GET_ROUTING_ALGOS,
1377                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1378                 .flags = GENL_ADMIN_PERM,
1379                 .dumpit = batadv_algo_dump,
1380         },
1381         {
1382                 .cmd = BATADV_CMD_GET_HARDIF,
1383                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1384                 /* can be retrieved by unprivileged users */
1385                 .dumpit = batadv_netlink_dump_hardif,
1386                 .doit = batadv_netlink_get_hardif,
1387                 .internal_flags = BATADV_FLAG_NEED_MESH |
1388                                   BATADV_FLAG_NEED_HARDIF,
1389         },
1390         {
1391                 .cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
1392                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1393                 .flags = GENL_ADMIN_PERM,
1394                 .dumpit = batadv_tt_local_dump,
1395         },
1396         {
1397                 .cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
1398                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1399                 .flags = GENL_ADMIN_PERM,
1400                 .dumpit = batadv_tt_global_dump,
1401         },
1402         {
1403                 .cmd = BATADV_CMD_GET_ORIGINATORS,
1404                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1405                 .flags = GENL_ADMIN_PERM,
1406                 .dumpit = batadv_orig_dump,
1407         },
1408         {
1409                 .cmd = BATADV_CMD_GET_NEIGHBORS,
1410                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1411                 .flags = GENL_ADMIN_PERM,
1412                 .dumpit = batadv_hardif_neigh_dump,
1413         },
1414         {
1415                 .cmd = BATADV_CMD_GET_GATEWAYS,
1416                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1417                 .flags = GENL_ADMIN_PERM,
1418                 .dumpit = batadv_gw_dump,
1419         },
1420         {
1421                 .cmd = BATADV_CMD_GET_BLA_CLAIM,
1422                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1423                 .flags = GENL_ADMIN_PERM,
1424                 .dumpit = batadv_bla_claim_dump,
1425         },
1426         {
1427                 .cmd = BATADV_CMD_GET_BLA_BACKBONE,
1428                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1429                 .flags = GENL_ADMIN_PERM,
1430                 .dumpit = batadv_bla_backbone_dump,
1431         },
1432         {
1433                 .cmd = BATADV_CMD_GET_DAT_CACHE,
1434                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1435                 .flags = GENL_ADMIN_PERM,
1436                 .dumpit = batadv_dat_cache_dump,
1437         },
1438         {
1439                 .cmd = BATADV_CMD_GET_MCAST_FLAGS,
1440                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1441                 .flags = GENL_ADMIN_PERM,
1442                 .dumpit = batadv_mcast_flags_dump,
1443         },
1444         {
1445                 .cmd = BATADV_CMD_SET_MESH,
1446                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1447                 .flags = GENL_ADMIN_PERM,
1448                 .doit = batadv_netlink_set_mesh,
1449                 .internal_flags = BATADV_FLAG_NEED_MESH,
1450         },
1451         {
1452                 .cmd = BATADV_CMD_SET_HARDIF,
1453                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1454                 .flags = GENL_ADMIN_PERM,
1455                 .doit = batadv_netlink_set_hardif,
1456                 .internal_flags = BATADV_FLAG_NEED_MESH |
1457                                   BATADV_FLAG_NEED_HARDIF,
1458         },
1459         {
1460                 .cmd = BATADV_CMD_GET_VLAN,
1461                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1462                 /* can be retrieved by unprivileged users */
1463                 .doit = batadv_netlink_get_vlan,
1464                 .internal_flags = BATADV_FLAG_NEED_MESH |
1465                                   BATADV_FLAG_NEED_VLAN,
1466         },
1467         {
1468                 .cmd = BATADV_CMD_SET_VLAN,
1469                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1470                 .flags = GENL_ADMIN_PERM,
1471                 .doit = batadv_netlink_set_vlan,
1472                 .internal_flags = BATADV_FLAG_NEED_MESH |
1473                                   BATADV_FLAG_NEED_VLAN,
1474         },
1475 };
1476
1477 struct genl_family batadv_netlink_family __ro_after_init = {
1478         .hdrsize = 0,
1479         .name = BATADV_NL_NAME,
1480         .version = 1,
1481         .maxattr = BATADV_ATTR_MAX,
1482         .policy = batadv_netlink_policy,
1483         .netnsok = true,
1484         .pre_doit = batadv_pre_doit,
1485         .post_doit = batadv_post_doit,
1486         .module = THIS_MODULE,
1487         .small_ops = batadv_netlink_ops,
1488         .n_small_ops = ARRAY_SIZE(batadv_netlink_ops),
1489         .mcgrps = batadv_netlink_mcgrps,
1490         .n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
1491 };
1492
1493 /**
1494  * batadv_netlink_register() - register batadv genl netlink family
1495  */
1496 void __init batadv_netlink_register(void)
1497 {
1498         int ret;
1499
1500         ret = genl_register_family(&batadv_netlink_family);
1501         if (ret)
1502                 pr_warn("unable to register netlink family");
1503 }
1504
1505 /**
1506  * batadv_netlink_unregister() - unregister batadv genl netlink family
1507  */
1508 void batadv_netlink_unregister(void)
1509 {
1510         genl_unregister_family(&batadv_netlink_family);
1511 }