xref: /openbmc/linux/net/batman-adv/netlink.c (revision bbb774d9)
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 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/minmax.h>
27 #include <linux/netdevice.h>
28 #include <linux/netlink.h>
29 #include <linux/printk.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/skbuff.h>
32 #include <linux/stddef.h>
33 #include <linux/types.h>
34 #include <net/genetlink.h>
35 #include <net/net_namespace.h>
36 #include <net/netlink.h>
37 #include <net/sock.h>
38 #include <uapi/linux/batadv_packet.h>
39 #include <uapi/linux/batman_adv.h>
40 
41 #include "bat_algo.h"
42 #include "bridge_loop_avoidance.h"
43 #include "distributed-arp-table.h"
44 #include "gateway_client.h"
45 #include "gateway_common.h"
46 #include "hard-interface.h"
47 #include "log.h"
48 #include "multicast.h"
49 #include "network-coding.h"
50 #include "originator.h"
51 #include "soft-interface.h"
52 #include "tp_meter.h"
53 #include "translation-table.h"
54 
55 struct genl_family batadv_netlink_family;
56 
57 /* multicast groups */
58 enum batadv_netlink_multicast_groups {
59 	BATADV_NL_MCGRP_CONFIG,
60 	BATADV_NL_MCGRP_TPMETER,
61 };
62 
63 /**
64  * enum batadv_genl_ops_flags - flags for genl_ops's internal_flags
65  */
66 enum batadv_genl_ops_flags {
67 	/**
68 	 * @BATADV_FLAG_NEED_MESH: request requires valid soft interface in
69 	 *  attribute BATADV_ATTR_MESH_IFINDEX and expects a pointer to it to be
70 	 *  saved in info->user_ptr[0]
71 	 */
72 	BATADV_FLAG_NEED_MESH = BIT(0),
73 
74 	/**
75 	 * @BATADV_FLAG_NEED_HARDIF: request requires valid hard interface in
76 	 *  attribute BATADV_ATTR_HARD_IFINDEX and expects a pointer to it to be
77 	 *  saved in info->user_ptr[1]
78 	 */
79 	BATADV_FLAG_NEED_HARDIF = BIT(1),
80 
81 	/**
82 	 * @BATADV_FLAG_NEED_VLAN: request requires valid vlan in
83 	 *  attribute BATADV_ATTR_VLANID and expects a pointer to it to be
84 	 *  saved in info->user_ptr[1]
85 	 */
86 	BATADV_FLAG_NEED_VLAN = BIT(2),
87 };
88 
89 static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
90 	[BATADV_NL_MCGRP_CONFIG] = { .name = BATADV_NL_MCAST_GROUP_CONFIG },
91 	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
92 };
93 
94 static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
95 	[BATADV_ATTR_VERSION]			= { .type = NLA_STRING },
96 	[BATADV_ATTR_ALGO_NAME]			= { .type = NLA_STRING },
97 	[BATADV_ATTR_MESH_IFINDEX]		= { .type = NLA_U32 },
98 	[BATADV_ATTR_MESH_IFNAME]		= { .type = NLA_STRING },
99 	[BATADV_ATTR_MESH_ADDRESS]		= { .len = ETH_ALEN },
100 	[BATADV_ATTR_HARD_IFINDEX]		= { .type = NLA_U32 },
101 	[BATADV_ATTR_HARD_IFNAME]		= { .type = NLA_STRING },
102 	[BATADV_ATTR_HARD_ADDRESS]		= { .len = ETH_ALEN },
103 	[BATADV_ATTR_ORIG_ADDRESS]		= { .len = ETH_ALEN },
104 	[BATADV_ATTR_TPMETER_RESULT]		= { .type = NLA_U8 },
105 	[BATADV_ATTR_TPMETER_TEST_TIME]		= { .type = NLA_U32 },
106 	[BATADV_ATTR_TPMETER_BYTES]		= { .type = NLA_U64 },
107 	[BATADV_ATTR_TPMETER_COOKIE]		= { .type = NLA_U32 },
108 	[BATADV_ATTR_ACTIVE]			= { .type = NLA_FLAG },
109 	[BATADV_ATTR_TT_ADDRESS]		= { .len = ETH_ALEN },
110 	[BATADV_ATTR_TT_TTVN]			= { .type = NLA_U8 },
111 	[BATADV_ATTR_TT_LAST_TTVN]		= { .type = NLA_U8 },
112 	[BATADV_ATTR_TT_CRC32]			= { .type = NLA_U32 },
113 	[BATADV_ATTR_TT_VID]			= { .type = NLA_U16 },
114 	[BATADV_ATTR_TT_FLAGS]			= { .type = NLA_U32 },
115 	[BATADV_ATTR_FLAG_BEST]			= { .type = NLA_FLAG },
116 	[BATADV_ATTR_LAST_SEEN_MSECS]		= { .type = NLA_U32 },
117 	[BATADV_ATTR_NEIGH_ADDRESS]		= { .len = ETH_ALEN },
118 	[BATADV_ATTR_TQ]			= { .type = NLA_U8 },
119 	[BATADV_ATTR_THROUGHPUT]		= { .type = NLA_U32 },
120 	[BATADV_ATTR_BANDWIDTH_UP]		= { .type = NLA_U32 },
121 	[BATADV_ATTR_BANDWIDTH_DOWN]		= { .type = NLA_U32 },
122 	[BATADV_ATTR_ROUTER]			= { .len = ETH_ALEN },
123 	[BATADV_ATTR_BLA_OWN]			= { .type = NLA_FLAG },
124 	[BATADV_ATTR_BLA_ADDRESS]		= { .len = ETH_ALEN },
125 	[BATADV_ATTR_BLA_VID]			= { .type = NLA_U16 },
126 	[BATADV_ATTR_BLA_BACKBONE]		= { .len = ETH_ALEN },
127 	[BATADV_ATTR_BLA_CRC]			= { .type = NLA_U16 },
128 	[BATADV_ATTR_DAT_CACHE_IP4ADDRESS]	= { .type = NLA_U32 },
129 	[BATADV_ATTR_DAT_CACHE_HWADDRESS]	= { .len = ETH_ALEN },
130 	[BATADV_ATTR_DAT_CACHE_VID]		= { .type = NLA_U16 },
131 	[BATADV_ATTR_MCAST_FLAGS]		= { .type = NLA_U32 },
132 	[BATADV_ATTR_MCAST_FLAGS_PRIV]		= { .type = NLA_U32 },
133 	[BATADV_ATTR_VLANID]			= { .type = NLA_U16 },
134 	[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]	= { .type = NLA_U8 },
135 	[BATADV_ATTR_AP_ISOLATION_ENABLED]	= { .type = NLA_U8 },
136 	[BATADV_ATTR_ISOLATION_MARK]		= { .type = NLA_U32 },
137 	[BATADV_ATTR_ISOLATION_MASK]		= { .type = NLA_U32 },
138 	[BATADV_ATTR_BONDING_ENABLED]		= { .type = NLA_U8 },
139 	[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]	= { .type = NLA_U8 },
140 	[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]	= { .type = NLA_U8 },
141 	[BATADV_ATTR_FRAGMENTATION_ENABLED]	= { .type = NLA_U8 },
142 	[BATADV_ATTR_GW_BANDWIDTH_DOWN]		= { .type = NLA_U32 },
143 	[BATADV_ATTR_GW_BANDWIDTH_UP]		= { .type = NLA_U32 },
144 	[BATADV_ATTR_GW_MODE]			= { .type = NLA_U8 },
145 	[BATADV_ATTR_GW_SEL_CLASS]		= { .type = NLA_U32 },
146 	[BATADV_ATTR_HOP_PENALTY]		= { .type = NLA_U8 },
147 	[BATADV_ATTR_LOG_LEVEL]			= { .type = NLA_U32 },
148 	[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]	= { .type = NLA_U8 },
149 	[BATADV_ATTR_MULTICAST_FANOUT]		= { .type = NLA_U32 },
150 	[BATADV_ATTR_NETWORK_CODING_ENABLED]	= { .type = NLA_U8 },
151 	[BATADV_ATTR_ORIG_INTERVAL]		= { .type = NLA_U32 },
152 	[BATADV_ATTR_ELP_INTERVAL]		= { .type = NLA_U32 },
153 	[BATADV_ATTR_THROUGHPUT_OVERRIDE]	= { .type = NLA_U32 },
154 };
155 
156 /**
157  * batadv_netlink_get_ifindex() - Extract an interface index from a message
158  * @nlh: Message header
159  * @attrtype: Attribute which holds an interface index
160  *
161  * Return: interface index, or 0.
162  */
163 int
164 batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
165 {
166 	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
167 
168 	return (attr && nla_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0;
169 }
170 
171 /**
172  * batadv_netlink_mesh_fill_ap_isolation() - Add ap_isolation softif attribute
173  * @msg: Netlink message to dump into
174  * @bat_priv: the bat priv with all the soft interface information
175  *
176  * Return: 0 on success or negative error number in case of failure
177  */
178 static int batadv_netlink_mesh_fill_ap_isolation(struct sk_buff *msg,
179 						 struct batadv_priv *bat_priv)
180 {
181 	struct batadv_softif_vlan *vlan;
182 	u8 ap_isolation;
183 
184 	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
185 	if (!vlan)
186 		return 0;
187 
188 	ap_isolation = atomic_read(&vlan->ap_isolation);
189 	batadv_softif_vlan_put(vlan);
190 
191 	return nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
192 			  !!ap_isolation);
193 }
194 
195 /**
196  * batadv_netlink_set_mesh_ap_isolation() - Set ap_isolation from genl msg
197  * @attr: parsed BATADV_ATTR_AP_ISOLATION_ENABLED attribute
198  * @bat_priv: the bat priv with all the soft interface information
199  *
200  * Return: 0 on success or negative error number in case of failure
201  */
202 static int batadv_netlink_set_mesh_ap_isolation(struct nlattr *attr,
203 						struct batadv_priv *bat_priv)
204 {
205 	struct batadv_softif_vlan *vlan;
206 
207 	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
208 	if (!vlan)
209 		return -ENOENT;
210 
211 	atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
212 	batadv_softif_vlan_put(vlan);
213 
214 	return 0;
215 }
216 
217 /**
218  * batadv_netlink_mesh_fill() - Fill message with mesh attributes
219  * @msg: Netlink message to dump into
220  * @bat_priv: the bat priv with all the soft interface information
221  * @cmd: type of message to generate
222  * @portid: Port making netlink request
223  * @seq: sequence number for message
224  * @flags: Additional flags for message
225  *
226  * Return: 0 on success or negative error number in case of failure
227  */
228 static int batadv_netlink_mesh_fill(struct sk_buff *msg,
229 				    struct batadv_priv *bat_priv,
230 				    enum batadv_nl_commands cmd,
231 				    u32 portid, u32 seq, int flags)
232 {
233 	struct net_device *soft_iface = bat_priv->soft_iface;
234 	struct batadv_hard_iface *primary_if = NULL;
235 	struct net_device *hard_iface;
236 	void *hdr;
237 
238 	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
239 	if (!hdr)
240 		return -ENOBUFS;
241 
242 	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
243 	    nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
244 			   bat_priv->algo_ops->name) ||
245 	    nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
246 	    nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
247 	    nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
248 		    soft_iface->dev_addr) ||
249 	    nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
250 		       (u8)atomic_read(&bat_priv->tt.vn)))
251 		goto nla_put_failure;
252 
253 #ifdef CONFIG_BATMAN_ADV_BLA
254 	if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
255 			ntohs(bat_priv->bla.claim_dest.group)))
256 		goto nla_put_failure;
257 #endif
258 
259 	if (batadv_mcast_mesh_info_put(msg, bat_priv))
260 		goto nla_put_failure;
261 
262 	primary_if = batadv_primary_if_get_selected(bat_priv);
263 	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
264 		hard_iface = primary_if->net_dev;
265 
266 		if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
267 				hard_iface->ifindex) ||
268 		    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
269 				   hard_iface->name) ||
270 		    nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
271 			    hard_iface->dev_addr))
272 			goto nla_put_failure;
273 	}
274 
275 	if (nla_put_u8(msg, BATADV_ATTR_AGGREGATED_OGMS_ENABLED,
276 		       !!atomic_read(&bat_priv->aggregated_ogms)))
277 		goto nla_put_failure;
278 
279 	if (batadv_netlink_mesh_fill_ap_isolation(msg, bat_priv))
280 		goto nla_put_failure;
281 
282 	if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK,
283 			bat_priv->isolation_mark))
284 		goto nla_put_failure;
285 
286 	if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK,
287 			bat_priv->isolation_mark_mask))
288 		goto nla_put_failure;
289 
290 	if (nla_put_u8(msg, BATADV_ATTR_BONDING_ENABLED,
291 		       !!atomic_read(&bat_priv->bonding)))
292 		goto nla_put_failure;
293 
294 #ifdef CONFIG_BATMAN_ADV_BLA
295 	if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED,
296 		       !!atomic_read(&bat_priv->bridge_loop_avoidance)))
297 		goto nla_put_failure;
298 #endif /* CONFIG_BATMAN_ADV_BLA */
299 
300 #ifdef CONFIG_BATMAN_ADV_DAT
301 	if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED,
302 		       !!atomic_read(&bat_priv->distributed_arp_table)))
303 		goto nla_put_failure;
304 #endif /* CONFIG_BATMAN_ADV_DAT */
305 
306 	if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED,
307 		       !!atomic_read(&bat_priv->fragmentation)))
308 		goto nla_put_failure;
309 
310 	if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN,
311 			atomic_read(&bat_priv->gw.bandwidth_down)))
312 		goto nla_put_failure;
313 
314 	if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP,
315 			atomic_read(&bat_priv->gw.bandwidth_up)))
316 		goto nla_put_failure;
317 
318 	if (nla_put_u8(msg, BATADV_ATTR_GW_MODE,
319 		       atomic_read(&bat_priv->gw.mode)))
320 		goto nla_put_failure;
321 
322 	if (bat_priv->algo_ops->gw.get_best_gw_node &&
323 	    bat_priv->algo_ops->gw.is_eligible) {
324 		/* GW selection class is not available if the routing algorithm
325 		 * in use does not implement the GW API
326 		 */
327 		if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS,
328 				atomic_read(&bat_priv->gw.sel_class)))
329 			goto nla_put_failure;
330 	}
331 
332 	if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
333 		       atomic_read(&bat_priv->hop_penalty)))
334 		goto nla_put_failure;
335 
336 #ifdef CONFIG_BATMAN_ADV_DEBUG
337 	if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL,
338 			atomic_read(&bat_priv->log_level)))
339 		goto nla_put_failure;
340 #endif /* CONFIG_BATMAN_ADV_DEBUG */
341 
342 #ifdef CONFIG_BATMAN_ADV_MCAST
343 	if (nla_put_u8(msg, BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED,
344 		       !atomic_read(&bat_priv->multicast_mode)))
345 		goto nla_put_failure;
346 
347 	if (nla_put_u32(msg, BATADV_ATTR_MULTICAST_FANOUT,
348 			atomic_read(&bat_priv->multicast_fanout)))
349 		goto nla_put_failure;
350 #endif /* CONFIG_BATMAN_ADV_MCAST */
351 
352 #ifdef CONFIG_BATMAN_ADV_NC
353 	if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED,
354 		       !!atomic_read(&bat_priv->network_coding)))
355 		goto nla_put_failure;
356 #endif /* CONFIG_BATMAN_ADV_NC */
357 
358 	if (nla_put_u32(msg, BATADV_ATTR_ORIG_INTERVAL,
359 			atomic_read(&bat_priv->orig_interval)))
360 		goto nla_put_failure;
361 
362 	batadv_hardif_put(primary_if);
363 
364 	genlmsg_end(msg, hdr);
365 	return 0;
366 
367 nla_put_failure:
368 	batadv_hardif_put(primary_if);
369 
370 	genlmsg_cancel(msg, hdr);
371 	return -EMSGSIZE;
372 }
373 
374 /**
375  * batadv_netlink_notify_mesh() - send softif attributes to listener
376  * @bat_priv: the bat priv with all the soft interface information
377  *
378  * Return: 0 on success, < 0 on error
379  */
380 int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
381 {
382 	struct sk_buff *msg;
383 	int ret;
384 
385 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
386 	if (!msg)
387 		return -ENOMEM;
388 
389 	ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_SET_MESH,
390 				       0, 0, 0);
391 	if (ret < 0) {
392 		nlmsg_free(msg);
393 		return ret;
394 	}
395 
396 	genlmsg_multicast_netns(&batadv_netlink_family,
397 				dev_net(bat_priv->soft_iface), msg, 0,
398 				BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
399 
400 	return 0;
401 }
402 
403 /**
404  * batadv_netlink_get_mesh() - Get softif attributes
405  * @skb: Netlink message with request data
406  * @info: receiver information
407  *
408  * Return: 0 on success or negative error number in case of failure
409  */
410 static int batadv_netlink_get_mesh(struct sk_buff *skb, struct genl_info *info)
411 {
412 	struct batadv_priv *bat_priv = info->user_ptr[0];
413 	struct sk_buff *msg;
414 	int ret;
415 
416 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
417 	if (!msg)
418 		return -ENOMEM;
419 
420 	ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_GET_MESH,
421 				       info->snd_portid, info->snd_seq, 0);
422 	if (ret < 0) {
423 		nlmsg_free(msg);
424 		return ret;
425 	}
426 
427 	ret = genlmsg_reply(msg, info);
428 
429 	return ret;
430 }
431 
432 /**
433  * batadv_netlink_set_mesh() - Set softif attributes
434  * @skb: Netlink message with request data
435  * @info: receiver information
436  *
437  * Return: 0 on success or negative error number in case of failure
438  */
439 static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
440 {
441 	struct batadv_priv *bat_priv = info->user_ptr[0];
442 	struct nlattr *attr;
443 
444 	if (info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]) {
445 		attr = info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED];
446 
447 		atomic_set(&bat_priv->aggregated_ogms, !!nla_get_u8(attr));
448 	}
449 
450 	if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
451 		attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
452 
453 		batadv_netlink_set_mesh_ap_isolation(attr, bat_priv);
454 	}
455 
456 	if (info->attrs[BATADV_ATTR_ISOLATION_MARK]) {
457 		attr = info->attrs[BATADV_ATTR_ISOLATION_MARK];
458 
459 		bat_priv->isolation_mark = nla_get_u32(attr);
460 	}
461 
462 	if (info->attrs[BATADV_ATTR_ISOLATION_MASK]) {
463 		attr = info->attrs[BATADV_ATTR_ISOLATION_MASK];
464 
465 		bat_priv->isolation_mark_mask = nla_get_u32(attr);
466 	}
467 
468 	if (info->attrs[BATADV_ATTR_BONDING_ENABLED]) {
469 		attr = info->attrs[BATADV_ATTR_BONDING_ENABLED];
470 
471 		atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
472 	}
473 
474 #ifdef CONFIG_BATMAN_ADV_BLA
475 	if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]) {
476 		attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED];
477 
478 		atomic_set(&bat_priv->bridge_loop_avoidance,
479 			   !!nla_get_u8(attr));
480 		batadv_bla_status_update(bat_priv->soft_iface);
481 	}
482 #endif /* CONFIG_BATMAN_ADV_BLA */
483 
484 #ifdef CONFIG_BATMAN_ADV_DAT
485 	if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]) {
486 		attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED];
487 
488 		atomic_set(&bat_priv->distributed_arp_table,
489 			   !!nla_get_u8(attr));
490 		batadv_dat_status_update(bat_priv->soft_iface);
491 	}
492 #endif /* CONFIG_BATMAN_ADV_DAT */
493 
494 	if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) {
495 		attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED];
496 
497 		atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr));
498 		batadv_update_min_mtu(bat_priv->soft_iface);
499 	}
500 
501 	if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) {
502 		attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN];
503 
504 		atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr));
505 		batadv_gw_tvlv_container_update(bat_priv);
506 	}
507 
508 	if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) {
509 		attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP];
510 
511 		atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr));
512 		batadv_gw_tvlv_container_update(bat_priv);
513 	}
514 
515 	if (info->attrs[BATADV_ATTR_GW_MODE]) {
516 		u8 gw_mode;
517 
518 		attr = info->attrs[BATADV_ATTR_GW_MODE];
519 		gw_mode = nla_get_u8(attr);
520 
521 		if (gw_mode <= BATADV_GW_MODE_SERVER) {
522 			/* Invoking batadv_gw_reselect() is not enough to really
523 			 * de-select the current GW. It will only instruct the
524 			 * gateway client code to perform a re-election the next
525 			 * time that this is needed.
526 			 *
527 			 * When gw client mode is being switched off the current
528 			 * GW must be de-selected explicitly otherwise no GW_ADD
529 			 * uevent is thrown on client mode re-activation. This
530 			 * is operation is performed in
531 			 * batadv_gw_check_client_stop().
532 			 */
533 			batadv_gw_reselect(bat_priv);
534 
535 			/* always call batadv_gw_check_client_stop() before
536 			 * changing the gateway state
537 			 */
538 			batadv_gw_check_client_stop(bat_priv);
539 			atomic_set(&bat_priv->gw.mode, gw_mode);
540 			batadv_gw_tvlv_container_update(bat_priv);
541 		}
542 	}
543 
544 	if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] &&
545 	    bat_priv->algo_ops->gw.get_best_gw_node &&
546 	    bat_priv->algo_ops->gw.is_eligible) {
547 		/* setting the GW selection class is allowed only if the routing
548 		 * algorithm in use implements the GW API
549 		 */
550 
551 		u32 sel_class_max = 0xffffffffu;
552 		u32 sel_class;
553 
554 		attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
555 		sel_class = nla_get_u32(attr);
556 
557 		if (!bat_priv->algo_ops->gw.store_sel_class)
558 			sel_class_max = BATADV_TQ_MAX_VALUE;
559 
560 		if (sel_class >= 1 && sel_class <= sel_class_max) {
561 			atomic_set(&bat_priv->gw.sel_class, sel_class);
562 			batadv_gw_reselect(bat_priv);
563 		}
564 	}
565 
566 	if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
567 		attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
568 
569 		atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr));
570 	}
571 
572 #ifdef CONFIG_BATMAN_ADV_DEBUG
573 	if (info->attrs[BATADV_ATTR_LOG_LEVEL]) {
574 		attr = info->attrs[BATADV_ATTR_LOG_LEVEL];
575 
576 		atomic_set(&bat_priv->log_level,
577 			   nla_get_u32(attr) & BATADV_DBG_ALL);
578 	}
579 #endif /* CONFIG_BATMAN_ADV_DEBUG */
580 
581 #ifdef CONFIG_BATMAN_ADV_MCAST
582 	if (info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]) {
583 		attr = info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED];
584 
585 		atomic_set(&bat_priv->multicast_mode, !nla_get_u8(attr));
586 	}
587 
588 	if (info->attrs[BATADV_ATTR_MULTICAST_FANOUT]) {
589 		attr = info->attrs[BATADV_ATTR_MULTICAST_FANOUT];
590 
591 		atomic_set(&bat_priv->multicast_fanout, nla_get_u32(attr));
592 	}
593 #endif /* CONFIG_BATMAN_ADV_MCAST */
594 
595 #ifdef CONFIG_BATMAN_ADV_NC
596 	if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) {
597 		attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED];
598 
599 		atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr));
600 		batadv_nc_status_update(bat_priv->soft_iface);
601 	}
602 #endif /* CONFIG_BATMAN_ADV_NC */
603 
604 	if (info->attrs[BATADV_ATTR_ORIG_INTERVAL]) {
605 		u32 orig_interval;
606 
607 		attr = info->attrs[BATADV_ATTR_ORIG_INTERVAL];
608 		orig_interval = nla_get_u32(attr);
609 
610 		orig_interval = min_t(u32, orig_interval, INT_MAX);
611 		orig_interval = max_t(u32, orig_interval, 2 * BATADV_JITTER);
612 
613 		atomic_set(&bat_priv->orig_interval, orig_interval);
614 	}
615 
616 	batadv_netlink_notify_mesh(bat_priv);
617 
618 	return 0;
619 }
620 
621 /**
622  * batadv_netlink_tp_meter_put() - Fill information of started tp_meter session
623  * @msg: netlink message to be sent back
624  * @cookie: tp meter session cookie
625  *
626  *  Return: 0 on success, < 0 on error
627  */
628 static int
629 batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
630 {
631 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
632 		return -ENOBUFS;
633 
634 	return 0;
635 }
636 
637 /**
638  * batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client
639  * @bat_priv: the bat priv with all the soft interface information
640  * @dst: destination of tp_meter session
641  * @result: reason for tp meter session stop
642  * @test_time: total time of the tp_meter session
643  * @total_bytes: bytes acked to the receiver
644  * @cookie: cookie of tp_meter session
645  *
646  * Return: 0 on success, < 0 on error
647  */
648 int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
649 				  u8 result, u32 test_time, u64 total_bytes,
650 				  u32 cookie)
651 {
652 	struct sk_buff *msg;
653 	void *hdr;
654 	int ret;
655 
656 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
657 	if (!msg)
658 		return -ENOMEM;
659 
660 	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
661 			  BATADV_CMD_TP_METER);
662 	if (!hdr) {
663 		ret = -ENOBUFS;
664 		goto err_genlmsg;
665 	}
666 
667 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
668 		goto nla_put_failure;
669 
670 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
671 		goto nla_put_failure;
672 
673 	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
674 			      BATADV_ATTR_PAD))
675 		goto nla_put_failure;
676 
677 	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
678 		goto nla_put_failure;
679 
680 	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
681 		goto nla_put_failure;
682 
683 	genlmsg_end(msg, hdr);
684 
685 	genlmsg_multicast_netns(&batadv_netlink_family,
686 				dev_net(bat_priv->soft_iface), msg, 0,
687 				BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
688 
689 	return 0;
690 
691 nla_put_failure:
692 	genlmsg_cancel(msg, hdr);
693 	ret = -EMSGSIZE;
694 
695 err_genlmsg:
696 	nlmsg_free(msg);
697 	return ret;
698 }
699 
700 /**
701  * batadv_netlink_tp_meter_start() - Start a new tp_meter session
702  * @skb: received netlink message
703  * @info: receiver information
704  *
705  * Return: 0 on success, < 0 on error
706  */
707 static int
708 batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
709 {
710 	struct batadv_priv *bat_priv = info->user_ptr[0];
711 	struct sk_buff *msg = NULL;
712 	u32 test_length;
713 	void *msg_head;
714 	u32 cookie;
715 	u8 *dst;
716 	int ret;
717 
718 	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
719 		return -EINVAL;
720 
721 	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
722 		return -EINVAL;
723 
724 	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
725 
726 	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
727 
728 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
729 	if (!msg) {
730 		ret = -ENOMEM;
731 		goto out;
732 	}
733 
734 	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
735 			       &batadv_netlink_family, 0,
736 			       BATADV_CMD_TP_METER);
737 	if (!msg_head) {
738 		ret = -ENOBUFS;
739 		goto out;
740 	}
741 
742 	batadv_tp_start(bat_priv, dst, test_length, &cookie);
743 
744 	ret = batadv_netlink_tp_meter_put(msg, cookie);
745 
746  out:
747 	if (ret) {
748 		if (msg)
749 			nlmsg_free(msg);
750 		return ret;
751 	}
752 
753 	genlmsg_end(msg, msg_head);
754 	return genlmsg_reply(msg, info);
755 }
756 
757 /**
758  * batadv_netlink_tp_meter_cancel() - Cancel a running tp_meter session
759  * @skb: received netlink message
760  * @info: receiver information
761  *
762  * Return: 0 on success, < 0 on error
763  */
764 static int
765 batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
766 {
767 	struct batadv_priv *bat_priv = info->user_ptr[0];
768 	u8 *dst;
769 	int ret = 0;
770 
771 	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
772 		return -EINVAL;
773 
774 	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
775 
776 	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
777 
778 	return ret;
779 }
780 
781 /**
782  * batadv_netlink_hardif_fill() - Fill message with hardif attributes
783  * @msg: Netlink message to dump into
784  * @bat_priv: the bat priv with all the soft interface information
785  * @hard_iface: hard interface which was modified
786  * @cmd: type of message to generate
787  * @portid: Port making netlink request
788  * @seq: sequence number for message
789  * @flags: Additional flags for message
790  * @cb: Control block containing additional options
791  *
792  * Return: 0 on success or negative error number in case of failure
793  */
794 static int batadv_netlink_hardif_fill(struct sk_buff *msg,
795 				      struct batadv_priv *bat_priv,
796 				      struct batadv_hard_iface *hard_iface,
797 				      enum batadv_nl_commands cmd,
798 				      u32 portid, u32 seq, int flags,
799 				      struct netlink_callback *cb)
800 {
801 	struct net_device *net_dev = hard_iface->net_dev;
802 	void *hdr;
803 
804 	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
805 	if (!hdr)
806 		return -ENOBUFS;
807 
808 	if (cb)
809 		genl_dump_check_consistent(cb, hdr);
810 
811 	if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
812 			bat_priv->soft_iface->ifindex))
813 		goto nla_put_failure;
814 
815 	if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
816 			   bat_priv->soft_iface->name))
817 		goto nla_put_failure;
818 
819 	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
820 			net_dev->ifindex) ||
821 	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
822 			   net_dev->name) ||
823 	    nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
824 		    net_dev->dev_addr))
825 		goto nla_put_failure;
826 
827 	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
828 		if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
829 			goto nla_put_failure;
830 	}
831 
832 	if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
833 		       atomic_read(&hard_iface->hop_penalty)))
834 		goto nla_put_failure;
835 
836 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
837 	if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL,
838 			atomic_read(&hard_iface->bat_v.elp_interval)))
839 		goto nla_put_failure;
840 
841 	if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT_OVERRIDE,
842 			atomic_read(&hard_iface->bat_v.throughput_override)))
843 		goto nla_put_failure;
844 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
845 
846 	genlmsg_end(msg, hdr);
847 	return 0;
848 
849 nla_put_failure:
850 	genlmsg_cancel(msg, hdr);
851 	return -EMSGSIZE;
852 }
853 
854 /**
855  * batadv_netlink_notify_hardif() - send hardif attributes to listener
856  * @bat_priv: the bat priv with all the soft interface information
857  * @hard_iface: hard interface which was modified
858  *
859  * Return: 0 on success, < 0 on error
860  */
861 int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
862 				 struct batadv_hard_iface *hard_iface)
863 {
864 	struct sk_buff *msg;
865 	int ret;
866 
867 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
868 	if (!msg)
869 		return -ENOMEM;
870 
871 	ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
872 					 BATADV_CMD_SET_HARDIF, 0, 0, 0, NULL);
873 	if (ret < 0) {
874 		nlmsg_free(msg);
875 		return ret;
876 	}
877 
878 	genlmsg_multicast_netns(&batadv_netlink_family,
879 				dev_net(bat_priv->soft_iface), msg, 0,
880 				BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
881 
882 	return 0;
883 }
884 
885 /**
886  * batadv_netlink_get_hardif() - Get hardif attributes
887  * @skb: Netlink message with request data
888  * @info: receiver information
889  *
890  * Return: 0 on success or negative error number in case of failure
891  */
892 static int batadv_netlink_get_hardif(struct sk_buff *skb,
893 				     struct genl_info *info)
894 {
895 	struct batadv_hard_iface *hard_iface = info->user_ptr[1];
896 	struct batadv_priv *bat_priv = info->user_ptr[0];
897 	struct sk_buff *msg;
898 	int ret;
899 
900 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
901 	if (!msg)
902 		return -ENOMEM;
903 
904 	ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
905 					 BATADV_CMD_GET_HARDIF,
906 					 info->snd_portid, info->snd_seq, 0,
907 					 NULL);
908 	if (ret < 0) {
909 		nlmsg_free(msg);
910 		return ret;
911 	}
912 
913 	ret = genlmsg_reply(msg, info);
914 
915 	return ret;
916 }
917 
918 /**
919  * batadv_netlink_set_hardif() - Set hardif attributes
920  * @skb: Netlink message with request data
921  * @info: receiver information
922  *
923  * Return: 0 on success or negative error number in case of failure
924  */
925 static int batadv_netlink_set_hardif(struct sk_buff *skb,
926 				     struct genl_info *info)
927 {
928 	struct batadv_hard_iface *hard_iface = info->user_ptr[1];
929 	struct batadv_priv *bat_priv = info->user_ptr[0];
930 	struct nlattr *attr;
931 
932 	if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
933 		attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
934 
935 		atomic_set(&hard_iface->hop_penalty, nla_get_u8(attr));
936 	}
937 
938 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
939 
940 	if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) {
941 		attr = info->attrs[BATADV_ATTR_ELP_INTERVAL];
942 
943 		atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr));
944 	}
945 
946 	if (info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]) {
947 		attr = info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE];
948 
949 		atomic_set(&hard_iface->bat_v.throughput_override,
950 			   nla_get_u32(attr));
951 	}
952 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
953 
954 	batadv_netlink_notify_hardif(bat_priv, hard_iface);
955 
956 	return 0;
957 }
958 
959 /**
960  * batadv_netlink_dump_hardif() - Dump all hard interface into a messages
961  * @msg: Netlink message to dump into
962  * @cb: Parameters from query
963  *
964  * Return: error code, or length of reply message on success
965  */
966 static int
967 batadv_netlink_dump_hardif(struct sk_buff *msg, struct netlink_callback *cb)
968 {
969 	struct net *net = sock_net(cb->skb->sk);
970 	struct net_device *soft_iface;
971 	struct batadv_hard_iface *hard_iface;
972 	struct batadv_priv *bat_priv;
973 	int ifindex;
974 	int portid = NETLINK_CB(cb->skb).portid;
975 	int skip = cb->args[0];
976 	int i = 0;
977 
978 	ifindex = batadv_netlink_get_ifindex(cb->nlh,
979 					     BATADV_ATTR_MESH_IFINDEX);
980 	if (!ifindex)
981 		return -EINVAL;
982 
983 	soft_iface = dev_get_by_index(net, ifindex);
984 	if (!soft_iface)
985 		return -ENODEV;
986 
987 	if (!batadv_softif_is_valid(soft_iface)) {
988 		dev_put(soft_iface);
989 		return -ENODEV;
990 	}
991 
992 	bat_priv = netdev_priv(soft_iface);
993 
994 	rtnl_lock();
995 	cb->seq = batadv_hardif_generation << 1 | 1;
996 
997 	list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
998 		if (hard_iface->soft_iface != soft_iface)
999 			continue;
1000 
1001 		if (i++ < skip)
1002 			continue;
1003 
1004 		if (batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
1005 					       BATADV_CMD_GET_HARDIF,
1006 					       portid, cb->nlh->nlmsg_seq,
1007 					       NLM_F_MULTI, cb)) {
1008 			i--;
1009 			break;
1010 		}
1011 	}
1012 
1013 	rtnl_unlock();
1014 
1015 	dev_put(soft_iface);
1016 
1017 	cb->args[0] = i;
1018 
1019 	return msg->len;
1020 }
1021 
1022 /**
1023  * batadv_netlink_vlan_fill() - Fill message with vlan attributes
1024  * @msg: Netlink message to dump into
1025  * @bat_priv: the bat priv with all the soft interface information
1026  * @vlan: vlan which was modified
1027  * @cmd: type of message to generate
1028  * @portid: Port making netlink request
1029  * @seq: sequence number for message
1030  * @flags: Additional flags for message
1031  *
1032  * Return: 0 on success or negative error number in case of failure
1033  */
1034 static int batadv_netlink_vlan_fill(struct sk_buff *msg,
1035 				    struct batadv_priv *bat_priv,
1036 				    struct batadv_softif_vlan *vlan,
1037 				    enum batadv_nl_commands cmd,
1038 				    u32 portid, u32 seq, int flags)
1039 {
1040 	void *hdr;
1041 
1042 	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
1043 	if (!hdr)
1044 		return -ENOBUFS;
1045 
1046 	if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
1047 			bat_priv->soft_iface->ifindex))
1048 		goto nla_put_failure;
1049 
1050 	if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
1051 			   bat_priv->soft_iface->name))
1052 		goto nla_put_failure;
1053 
1054 	if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
1055 		goto nla_put_failure;
1056 
1057 	if (nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
1058 		       !!atomic_read(&vlan->ap_isolation)))
1059 		goto nla_put_failure;
1060 
1061 	genlmsg_end(msg, hdr);
1062 	return 0;
1063 
1064 nla_put_failure:
1065 	genlmsg_cancel(msg, hdr);
1066 	return -EMSGSIZE;
1067 }
1068 
1069 /**
1070  * batadv_netlink_notify_vlan() - send vlan attributes to listener
1071  * @bat_priv: the bat priv with all the soft interface information
1072  * @vlan: vlan which was modified
1073  *
1074  * Return: 0 on success, < 0 on error
1075  */
1076 int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
1077 			       struct batadv_softif_vlan *vlan)
1078 {
1079 	struct sk_buff *msg;
1080 	int ret;
1081 
1082 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1083 	if (!msg)
1084 		return -ENOMEM;
1085 
1086 	ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan,
1087 				       BATADV_CMD_SET_VLAN, 0, 0, 0);
1088 	if (ret < 0) {
1089 		nlmsg_free(msg);
1090 		return ret;
1091 	}
1092 
1093 	genlmsg_multicast_netns(&batadv_netlink_family,
1094 				dev_net(bat_priv->soft_iface), msg, 0,
1095 				BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
1096 
1097 	return 0;
1098 }
1099 
1100 /**
1101  * batadv_netlink_get_vlan() - Get vlan attributes
1102  * @skb: Netlink message with request data
1103  * @info: receiver information
1104  *
1105  * Return: 0 on success or negative error number in case of failure
1106  */
1107 static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info)
1108 {
1109 	struct batadv_softif_vlan *vlan = info->user_ptr[1];
1110 	struct batadv_priv *bat_priv = info->user_ptr[0];
1111 	struct sk_buff *msg;
1112 	int ret;
1113 
1114 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1115 	if (!msg)
1116 		return -ENOMEM;
1117 
1118 	ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
1119 				       info->snd_portid, info->snd_seq, 0);
1120 	if (ret < 0) {
1121 		nlmsg_free(msg);
1122 		return ret;
1123 	}
1124 
1125 	ret = genlmsg_reply(msg, info);
1126 
1127 	return ret;
1128 }
1129 
1130 /**
1131  * batadv_netlink_set_vlan() - Get vlan attributes
1132  * @skb: Netlink message with request data
1133  * @info: receiver information
1134  *
1135  * Return: 0 on success or negative error number in case of failure
1136  */
1137 static int batadv_netlink_set_vlan(struct sk_buff *skb, struct genl_info *info)
1138 {
1139 	struct batadv_softif_vlan *vlan = info->user_ptr[1];
1140 	struct batadv_priv *bat_priv = info->user_ptr[0];
1141 	struct nlattr *attr;
1142 
1143 	if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
1144 		attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
1145 
1146 		atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
1147 	}
1148 
1149 	batadv_netlink_notify_vlan(bat_priv, vlan);
1150 
1151 	return 0;
1152 }
1153 
1154 /**
1155  * batadv_get_softif_from_info() - Retrieve soft interface from genl attributes
1156  * @net: the applicable net namespace
1157  * @info: receiver information
1158  *
1159  * Return: Pointer to soft interface (with increased refcnt) on success, error
1160  *  pointer on error
1161  */
1162 static struct net_device *
1163 batadv_get_softif_from_info(struct net *net, struct genl_info *info)
1164 {
1165 	struct net_device *soft_iface;
1166 	int ifindex;
1167 
1168 	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
1169 		return ERR_PTR(-EINVAL);
1170 
1171 	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
1172 
1173 	soft_iface = dev_get_by_index(net, ifindex);
1174 	if (!soft_iface)
1175 		return ERR_PTR(-ENODEV);
1176 
1177 	if (!batadv_softif_is_valid(soft_iface))
1178 		goto err_put_softif;
1179 
1180 	return soft_iface;
1181 
1182 err_put_softif:
1183 	dev_put(soft_iface);
1184 
1185 	return ERR_PTR(-EINVAL);
1186 }
1187 
1188 /**
1189  * batadv_get_hardif_from_info() - Retrieve hardif from genl attributes
1190  * @bat_priv: the bat priv with all the soft interface information
1191  * @net: the applicable net namespace
1192  * @info: receiver information
1193  *
1194  * Return: Pointer to hard interface (with increased refcnt) on success, error
1195  *  pointer on error
1196  */
1197 static struct batadv_hard_iface *
1198 batadv_get_hardif_from_info(struct batadv_priv *bat_priv, struct net *net,
1199 			    struct genl_info *info)
1200 {
1201 	struct batadv_hard_iface *hard_iface;
1202 	struct net_device *hard_dev;
1203 	unsigned int hardif_index;
1204 
1205 	if (!info->attrs[BATADV_ATTR_HARD_IFINDEX])
1206 		return ERR_PTR(-EINVAL);
1207 
1208 	hardif_index = nla_get_u32(info->attrs[BATADV_ATTR_HARD_IFINDEX]);
1209 
1210 	hard_dev = dev_get_by_index(net, hardif_index);
1211 	if (!hard_dev)
1212 		return ERR_PTR(-ENODEV);
1213 
1214 	hard_iface = batadv_hardif_get_by_netdev(hard_dev);
1215 	if (!hard_iface)
1216 		goto err_put_harddev;
1217 
1218 	if (hard_iface->soft_iface != bat_priv->soft_iface)
1219 		goto err_put_hardif;
1220 
1221 	/* hard_dev is referenced by hard_iface and not needed here */
1222 	dev_put(hard_dev);
1223 
1224 	return hard_iface;
1225 
1226 err_put_hardif:
1227 	batadv_hardif_put(hard_iface);
1228 err_put_harddev:
1229 	dev_put(hard_dev);
1230 
1231 	return ERR_PTR(-EINVAL);
1232 }
1233 
1234 /**
1235  * batadv_get_vlan_from_info() - Retrieve vlan from genl attributes
1236  * @bat_priv: the bat priv with all the soft interface information
1237  * @net: the applicable net namespace
1238  * @info: receiver information
1239  *
1240  * Return: Pointer to vlan on success (with increased refcnt), error pointer
1241  *  on error
1242  */
1243 static struct batadv_softif_vlan *
1244 batadv_get_vlan_from_info(struct batadv_priv *bat_priv, struct net *net,
1245 			  struct genl_info *info)
1246 {
1247 	struct batadv_softif_vlan *vlan;
1248 	u16 vid;
1249 
1250 	if (!info->attrs[BATADV_ATTR_VLANID])
1251 		return ERR_PTR(-EINVAL);
1252 
1253 	vid = nla_get_u16(info->attrs[BATADV_ATTR_VLANID]);
1254 
1255 	vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
1256 	if (!vlan)
1257 		return ERR_PTR(-ENOENT);
1258 
1259 	return vlan;
1260 }
1261 
1262 /**
1263  * batadv_pre_doit() - Prepare batman-adv genl doit request
1264  * @ops: requested netlink operation
1265  * @skb: Netlink message with request data
1266  * @info: receiver information
1267  *
1268  * Return: 0 on success or negative error number in case of failure
1269  */
1270 static int batadv_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
1271 			   struct genl_info *info)
1272 {
1273 	struct net *net = genl_info_net(info);
1274 	struct batadv_hard_iface *hard_iface;
1275 	struct batadv_priv *bat_priv = NULL;
1276 	struct batadv_softif_vlan *vlan;
1277 	struct net_device *soft_iface;
1278 	u8 user_ptr1_flags;
1279 	u8 mesh_dep_flags;
1280 	int ret;
1281 
1282 	user_ptr1_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1283 	if (WARN_ON(hweight8(ops->internal_flags & user_ptr1_flags) > 1))
1284 		return -EINVAL;
1285 
1286 	mesh_dep_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1287 	if (WARN_ON((ops->internal_flags & mesh_dep_flags) &&
1288 		    (~ops->internal_flags & BATADV_FLAG_NEED_MESH)))
1289 		return -EINVAL;
1290 
1291 	if (ops->internal_flags & BATADV_FLAG_NEED_MESH) {
1292 		soft_iface = batadv_get_softif_from_info(net, info);
1293 		if (IS_ERR(soft_iface))
1294 			return PTR_ERR(soft_iface);
1295 
1296 		bat_priv = netdev_priv(soft_iface);
1297 		info->user_ptr[0] = bat_priv;
1298 	}
1299 
1300 	if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF) {
1301 		hard_iface = batadv_get_hardif_from_info(bat_priv, net, info);
1302 		if (IS_ERR(hard_iface)) {
1303 			ret = PTR_ERR(hard_iface);
1304 			goto err_put_softif;
1305 		}
1306 
1307 		info->user_ptr[1] = hard_iface;
1308 	}
1309 
1310 	if (ops->internal_flags & BATADV_FLAG_NEED_VLAN) {
1311 		vlan = batadv_get_vlan_from_info(bat_priv, net, info);
1312 		if (IS_ERR(vlan)) {
1313 			ret = PTR_ERR(vlan);
1314 			goto err_put_softif;
1315 		}
1316 
1317 		info->user_ptr[1] = vlan;
1318 	}
1319 
1320 	return 0;
1321 
1322 err_put_softif:
1323 	if (bat_priv)
1324 		dev_put(bat_priv->soft_iface);
1325 
1326 	return ret;
1327 }
1328 
1329 /**
1330  * batadv_post_doit() - End batman-adv genl doit request
1331  * @ops: requested netlink operation
1332  * @skb: Netlink message with request data
1333  * @info: receiver information
1334  */
1335 static void batadv_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
1336 			     struct genl_info *info)
1337 {
1338 	struct batadv_hard_iface *hard_iface;
1339 	struct batadv_softif_vlan *vlan;
1340 	struct batadv_priv *bat_priv;
1341 
1342 	if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF &&
1343 	    info->user_ptr[1]) {
1344 		hard_iface = info->user_ptr[1];
1345 
1346 		batadv_hardif_put(hard_iface);
1347 	}
1348 
1349 	if (ops->internal_flags & BATADV_FLAG_NEED_VLAN && info->user_ptr[1]) {
1350 		vlan = info->user_ptr[1];
1351 		batadv_softif_vlan_put(vlan);
1352 	}
1353 
1354 	if (ops->internal_flags & BATADV_FLAG_NEED_MESH && info->user_ptr[0]) {
1355 		bat_priv = info->user_ptr[0];
1356 		dev_put(bat_priv->soft_iface);
1357 	}
1358 }
1359 
1360 static const struct genl_small_ops batadv_netlink_ops[] = {
1361 	{
1362 		.cmd = BATADV_CMD_GET_MESH,
1363 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1364 		/* can be retrieved by unprivileged users */
1365 		.doit = batadv_netlink_get_mesh,
1366 		.internal_flags = BATADV_FLAG_NEED_MESH,
1367 	},
1368 	{
1369 		.cmd = BATADV_CMD_TP_METER,
1370 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1371 		.flags = GENL_UNS_ADMIN_PERM,
1372 		.doit = batadv_netlink_tp_meter_start,
1373 		.internal_flags = BATADV_FLAG_NEED_MESH,
1374 	},
1375 	{
1376 		.cmd = BATADV_CMD_TP_METER_CANCEL,
1377 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1378 		.flags = GENL_UNS_ADMIN_PERM,
1379 		.doit = batadv_netlink_tp_meter_cancel,
1380 		.internal_flags = BATADV_FLAG_NEED_MESH,
1381 	},
1382 	{
1383 		.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
1384 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1385 		.flags = GENL_UNS_ADMIN_PERM,
1386 		.dumpit = batadv_algo_dump,
1387 	},
1388 	{
1389 		.cmd = BATADV_CMD_GET_HARDIF,
1390 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1391 		/* can be retrieved by unprivileged users */
1392 		.dumpit = batadv_netlink_dump_hardif,
1393 		.doit = batadv_netlink_get_hardif,
1394 		.internal_flags = BATADV_FLAG_NEED_MESH |
1395 				  BATADV_FLAG_NEED_HARDIF,
1396 	},
1397 	{
1398 		.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
1399 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1400 		.flags = GENL_UNS_ADMIN_PERM,
1401 		.dumpit = batadv_tt_local_dump,
1402 	},
1403 	{
1404 		.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
1405 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1406 		.flags = GENL_UNS_ADMIN_PERM,
1407 		.dumpit = batadv_tt_global_dump,
1408 	},
1409 	{
1410 		.cmd = BATADV_CMD_GET_ORIGINATORS,
1411 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1412 		.flags = GENL_UNS_ADMIN_PERM,
1413 		.dumpit = batadv_orig_dump,
1414 	},
1415 	{
1416 		.cmd = BATADV_CMD_GET_NEIGHBORS,
1417 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1418 		.flags = GENL_UNS_ADMIN_PERM,
1419 		.dumpit = batadv_hardif_neigh_dump,
1420 	},
1421 	{
1422 		.cmd = BATADV_CMD_GET_GATEWAYS,
1423 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1424 		.flags = GENL_UNS_ADMIN_PERM,
1425 		.dumpit = batadv_gw_dump,
1426 	},
1427 	{
1428 		.cmd = BATADV_CMD_GET_BLA_CLAIM,
1429 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1430 		.flags = GENL_UNS_ADMIN_PERM,
1431 		.dumpit = batadv_bla_claim_dump,
1432 	},
1433 	{
1434 		.cmd = BATADV_CMD_GET_BLA_BACKBONE,
1435 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1436 		.flags = GENL_UNS_ADMIN_PERM,
1437 		.dumpit = batadv_bla_backbone_dump,
1438 	},
1439 	{
1440 		.cmd = BATADV_CMD_GET_DAT_CACHE,
1441 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1442 		.flags = GENL_UNS_ADMIN_PERM,
1443 		.dumpit = batadv_dat_cache_dump,
1444 	},
1445 	{
1446 		.cmd = BATADV_CMD_GET_MCAST_FLAGS,
1447 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1448 		.flags = GENL_UNS_ADMIN_PERM,
1449 		.dumpit = batadv_mcast_flags_dump,
1450 	},
1451 	{
1452 		.cmd = BATADV_CMD_SET_MESH,
1453 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1454 		.flags = GENL_UNS_ADMIN_PERM,
1455 		.doit = batadv_netlink_set_mesh,
1456 		.internal_flags = BATADV_FLAG_NEED_MESH,
1457 	},
1458 	{
1459 		.cmd = BATADV_CMD_SET_HARDIF,
1460 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1461 		.flags = GENL_UNS_ADMIN_PERM,
1462 		.doit = batadv_netlink_set_hardif,
1463 		.internal_flags = BATADV_FLAG_NEED_MESH |
1464 				  BATADV_FLAG_NEED_HARDIF,
1465 	},
1466 	{
1467 		.cmd = BATADV_CMD_GET_VLAN,
1468 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1469 		/* can be retrieved by unprivileged users */
1470 		.doit = batadv_netlink_get_vlan,
1471 		.internal_flags = BATADV_FLAG_NEED_MESH |
1472 				  BATADV_FLAG_NEED_VLAN,
1473 	},
1474 	{
1475 		.cmd = BATADV_CMD_SET_VLAN,
1476 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1477 		.flags = GENL_UNS_ADMIN_PERM,
1478 		.doit = batadv_netlink_set_vlan,
1479 		.internal_flags = BATADV_FLAG_NEED_MESH |
1480 				  BATADV_FLAG_NEED_VLAN,
1481 	},
1482 };
1483 
1484 struct genl_family batadv_netlink_family __ro_after_init = {
1485 	.hdrsize = 0,
1486 	.name = BATADV_NL_NAME,
1487 	.version = 1,
1488 	.maxattr = BATADV_ATTR_MAX,
1489 	.policy = batadv_netlink_policy,
1490 	.netnsok = true,
1491 	.pre_doit = batadv_pre_doit,
1492 	.post_doit = batadv_post_doit,
1493 	.module = THIS_MODULE,
1494 	.small_ops = batadv_netlink_ops,
1495 	.n_small_ops = ARRAY_SIZE(batadv_netlink_ops),
1496 	.mcgrps = batadv_netlink_mcgrps,
1497 	.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
1498 };
1499 
1500 /**
1501  * batadv_netlink_register() - register batadv genl netlink family
1502  */
1503 void __init batadv_netlink_register(void)
1504 {
1505 	int ret;
1506 
1507 	ret = genl_register_family(&batadv_netlink_family);
1508 	if (ret)
1509 		pr_warn("unable to register netlink family");
1510 }
1511 
1512 /**
1513  * batadv_netlink_unregister() - unregister batadv genl netlink family
1514  */
1515 void batadv_netlink_unregister(void)
1516 {
1517 	genl_unregister_family(&batadv_netlink_family);
1518 }
1519