1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
3 | * |
4 | * Marek Lindner, Simon Wunderlich |
5 | */ |
6 | |
7 | #include "soft-interface.h" |
8 | #include "main.h" |
9 | |
10 | #include <linux/atomic.h> |
11 | #include <linux/byteorder/generic.h> |
12 | #include <linux/cache.h> |
13 | #include <linux/compiler.h> |
14 | #include <linux/container_of.h> |
15 | #include <linux/cpumask.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/etherdevice.h> |
18 | #include <linux/ethtool.h> |
19 | #include <linux/gfp.h> |
20 | #include <linux/if_ether.h> |
21 | #include <linux/if_vlan.h> |
22 | #include <linux/jiffies.h> |
23 | #include <linux/kref.h> |
24 | #include <linux/list.h> |
25 | #include <linux/lockdep.h> |
26 | #include <linux/netdevice.h> |
27 | #include <linux/netlink.h> |
28 | #include <linux/percpu.h> |
29 | #include <linux/random.h> |
30 | #include <linux/rculist.h> |
31 | #include <linux/rcupdate.h> |
32 | #include <linux/skbuff.h> |
33 | #include <linux/slab.h> |
34 | #include <linux/socket.h> |
35 | #include <linux/spinlock.h> |
36 | #include <linux/stddef.h> |
37 | #include <linux/string.h> |
38 | #include <linux/types.h> |
39 | #include <net/net_namespace.h> |
40 | #include <net/netlink.h> |
41 | #include <uapi/linux/batadv_packet.h> |
42 | #include <uapi/linux/batman_adv.h> |
43 | |
44 | #include "bat_algo.h" |
45 | #include "bridge_loop_avoidance.h" |
46 | #include "distributed-arp-table.h" |
47 | #include "gateway_client.h" |
48 | #include "hard-interface.h" |
49 | #include "multicast.h" |
50 | #include "network-coding.h" |
51 | #include "send.h" |
52 | #include "translation-table.h" |
53 | |
54 | /** |
55 | * batadv_skb_head_push() - Increase header size and move (push) head pointer |
56 | * @skb: packet buffer which should be modified |
57 | * @len: number of bytes to add |
58 | * |
59 | * Return: 0 on success or negative error number in case of failure |
60 | */ |
61 | int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) |
62 | { |
63 | int result; |
64 | |
65 | /* TODO: We must check if we can release all references to non-payload |
66 | * data using __skb_header_release in our skbs to allow skb_cow_header |
67 | * to work optimally. This means that those skbs are not allowed to read |
68 | * or write any data which is before the current position of skb->data |
69 | * after that call and thus allow other skbs with the same data buffer |
70 | * to write freely in that area. |
71 | */ |
72 | result = skb_cow_head(skb, headroom: len); |
73 | if (result < 0) |
74 | return result; |
75 | |
76 | skb_push(skb, len); |
77 | return 0; |
78 | } |
79 | |
80 | static int batadv_interface_open(struct net_device *dev) |
81 | { |
82 | netif_start_queue(dev); |
83 | return 0; |
84 | } |
85 | |
86 | static int batadv_interface_release(struct net_device *dev) |
87 | { |
88 | netif_stop_queue(dev); |
89 | return 0; |
90 | } |
91 | |
92 | /** |
93 | * batadv_sum_counter() - Sum the cpu-local counters for index 'idx' |
94 | * @bat_priv: the bat priv with all the soft interface information |
95 | * @idx: index of counter to sum up |
96 | * |
97 | * Return: sum of all cpu-local counters |
98 | */ |
99 | static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) |
100 | { |
101 | u64 *counters, sum = 0; |
102 | int cpu; |
103 | |
104 | for_each_possible_cpu(cpu) { |
105 | counters = per_cpu_ptr(bat_priv->bat_counters, cpu); |
106 | sum += counters[idx]; |
107 | } |
108 | |
109 | return sum; |
110 | } |
111 | |
112 | static struct net_device_stats *batadv_interface_stats(struct net_device *dev) |
113 | { |
114 | struct batadv_priv *bat_priv = netdev_priv(dev); |
115 | struct net_device_stats *stats = &dev->stats; |
116 | |
117 | stats->tx_packets = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX); |
118 | stats->tx_bytes = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX_BYTES); |
119 | stats->tx_dropped = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX_DROPPED); |
120 | stats->rx_packets = batadv_sum_counter(bat_priv, idx: BATADV_CNT_RX); |
121 | stats->rx_bytes = batadv_sum_counter(bat_priv, idx: BATADV_CNT_RX_BYTES); |
122 | return stats; |
123 | } |
124 | |
125 | static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) |
126 | { |
127 | struct batadv_priv *bat_priv = netdev_priv(dev); |
128 | struct batadv_softif_vlan *vlan; |
129 | struct sockaddr *addr = p; |
130 | u8 old_addr[ETH_ALEN]; |
131 | |
132 | if (!is_valid_ether_addr(addr: addr->sa_data)) |
133 | return -EADDRNOTAVAIL; |
134 | |
135 | ether_addr_copy(dst: old_addr, src: dev->dev_addr); |
136 | eth_hw_addr_set(dev, addr: addr->sa_data); |
137 | |
138 | /* only modify transtable if it has been initialized before */ |
139 | if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
140 | return 0; |
141 | |
142 | rcu_read_lock(); |
143 | hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { |
144 | batadv_tt_local_remove(bat_priv, addr: old_addr, vid: vlan->vid, |
145 | message: "mac address changed" , roaming: false); |
146 | batadv_tt_local_add(soft_iface: dev, addr: addr->sa_data, vid: vlan->vid, |
147 | BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
148 | } |
149 | rcu_read_unlock(); |
150 | |
151 | return 0; |
152 | } |
153 | |
154 | static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) |
155 | { |
156 | struct batadv_priv *bat_priv = netdev_priv(dev); |
157 | |
158 | /* check ranges */ |
159 | if (new_mtu < ETH_MIN_MTU || new_mtu > batadv_hardif_min_mtu(soft_iface: dev)) |
160 | return -EINVAL; |
161 | |
162 | dev->mtu = new_mtu; |
163 | bat_priv->mtu_set_by_user = new_mtu; |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | /** |
169 | * batadv_interface_set_rx_mode() - set the rx mode of a device |
170 | * @dev: registered network device to modify |
171 | * |
172 | * We do not actually need to set any rx filters for the virtual batman |
173 | * soft interface. However a dummy handler enables a user to set static |
174 | * multicast listeners for instance. |
175 | */ |
176 | static void batadv_interface_set_rx_mode(struct net_device *dev) |
177 | { |
178 | } |
179 | |
180 | static netdev_tx_t batadv_interface_tx(struct sk_buff *skb, |
181 | struct net_device *soft_iface) |
182 | { |
183 | struct ethhdr *ethhdr; |
184 | struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface); |
185 | struct batadv_hard_iface *primary_if = NULL; |
186 | struct batadv_bcast_packet *bcast_packet; |
187 | static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, |
188 | 0x00, 0x00}; |
189 | static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, |
190 | 0x00, 0x00}; |
191 | enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; |
192 | u8 *dst_hint = NULL, chaddr[ETH_ALEN]; |
193 | struct vlan_ethhdr *vhdr; |
194 | unsigned int = 0; |
195 | int data_len = skb->len, ret; |
196 | unsigned long brd_delay = 0; |
197 | bool do_bcast = false, client_added; |
198 | unsigned short vid; |
199 | u32 seqno; |
200 | int gw_mode; |
201 | enum batadv_forw_mode forw_mode = BATADV_FORW_BCAST; |
202 | int mcast_is_routable = 0; |
203 | int network_offset = ETH_HLEN; |
204 | __be16 proto; |
205 | |
206 | if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
207 | goto dropped; |
208 | |
209 | /* reset control block to avoid left overs from previous users */ |
210 | memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); |
211 | |
212 | netif_trans_update(dev: soft_iface); |
213 | vid = batadv_get_vid(skb, header_len: 0); |
214 | |
215 | skb_reset_mac_header(skb); |
216 | ethhdr = eth_hdr(skb); |
217 | |
218 | proto = ethhdr->h_proto; |
219 | |
220 | switch (ntohs(proto)) { |
221 | case ETH_P_8021Q: |
222 | if (!pskb_may_pull(skb, len: sizeof(*vhdr))) |
223 | goto dropped; |
224 | vhdr = vlan_eth_hdr(skb); |
225 | proto = vhdr->h_vlan_encapsulated_proto; |
226 | |
227 | /* drop batman-in-batman packets to prevent loops */ |
228 | if (proto != htons(ETH_P_BATMAN)) { |
229 | network_offset += VLAN_HLEN; |
230 | break; |
231 | } |
232 | |
233 | fallthrough; |
234 | case ETH_P_BATMAN: |
235 | goto dropped; |
236 | } |
237 | |
238 | skb_set_network_header(skb, offset: network_offset); |
239 | |
240 | if (batadv_bla_tx(bat_priv, skb, vid)) |
241 | goto dropped; |
242 | |
243 | /* skb->data might have been reallocated by batadv_bla_tx() */ |
244 | ethhdr = eth_hdr(skb); |
245 | |
246 | /* Register the client MAC in the transtable */ |
247 | if (!is_multicast_ether_addr(addr: ethhdr->h_source) && |
248 | !batadv_bla_is_loopdetect_mac(mac: ethhdr->h_source)) { |
249 | client_added = batadv_tt_local_add(soft_iface, addr: ethhdr->h_source, |
250 | vid, ifindex: skb->skb_iif, |
251 | mark: skb->mark); |
252 | if (!client_added) |
253 | goto dropped; |
254 | } |
255 | |
256 | /* Snoop address candidates from DHCPACKs for early DAT filling */ |
257 | batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid); |
258 | |
259 | /* don't accept stp packets. STP does not help in meshes. |
260 | * better use the bridge loop avoidance ... |
261 | * |
262 | * The same goes for ECTP sent at least by some Cisco Switches, |
263 | * it might confuse the mesh when used with bridge loop avoidance. |
264 | */ |
265 | if (batadv_compare_eth(data1: ethhdr->h_dest, data2: stp_addr)) |
266 | goto dropped; |
267 | |
268 | if (batadv_compare_eth(data1: ethhdr->h_dest, data2: ectp_addr)) |
269 | goto dropped; |
270 | |
271 | gw_mode = atomic_read(v: &bat_priv->gw.mode); |
272 | if (is_multicast_ether_addr(addr: ethhdr->h_dest)) { |
273 | /* if gw mode is off, broadcast every packet */ |
274 | if (gw_mode == BATADV_GW_MODE_OFF) { |
275 | do_bcast = true; |
276 | goto send; |
277 | } |
278 | |
279 | dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, header_len: &header_len, |
280 | chaddr); |
281 | /* skb->data may have been modified by |
282 | * batadv_gw_dhcp_recipient_get() |
283 | */ |
284 | ethhdr = eth_hdr(skb); |
285 | /* if gw_mode is on, broadcast any non-DHCP message. |
286 | * All the DHCP packets are going to be sent as unicast |
287 | */ |
288 | if (dhcp_rcp == BATADV_DHCP_NO) { |
289 | do_bcast = true; |
290 | goto send; |
291 | } |
292 | |
293 | if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) |
294 | dst_hint = chaddr; |
295 | else if ((gw_mode == BATADV_GW_MODE_SERVER) && |
296 | (dhcp_rcp == BATADV_DHCP_TO_SERVER)) |
297 | /* gateways should not forward any DHCP message if |
298 | * directed to a DHCP server |
299 | */ |
300 | goto dropped; |
301 | |
302 | send: |
303 | if (do_bcast && !is_broadcast_ether_addr(addr: ethhdr->h_dest)) { |
304 | forw_mode = batadv_mcast_forw_mode(bat_priv, skb, vid, |
305 | is_routable: &mcast_is_routable); |
306 | switch (forw_mode) { |
307 | case BATADV_FORW_BCAST: |
308 | break; |
309 | case BATADV_FORW_UCASTS: |
310 | case BATADV_FORW_MCAST: |
311 | do_bcast = false; |
312 | break; |
313 | case BATADV_FORW_NONE: |
314 | fallthrough; |
315 | default: |
316 | goto dropped; |
317 | } |
318 | } |
319 | } |
320 | |
321 | batadv_skb_set_priority(skb, offset: 0); |
322 | |
323 | /* ethernet packet should be broadcasted */ |
324 | if (do_bcast) { |
325 | primary_if = batadv_primary_if_get_selected(bat_priv); |
326 | if (!primary_if) |
327 | goto dropped; |
328 | |
329 | /* in case of ARP request, we do not immediately broadcasti the |
330 | * packet, instead we first wait for DAT to try to retrieve the |
331 | * correct ARP entry |
332 | */ |
333 | if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) |
334 | brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); |
335 | |
336 | if (batadv_skb_head_push(skb, len: sizeof(*bcast_packet)) < 0) |
337 | goto dropped; |
338 | |
339 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
340 | bcast_packet->version = BATADV_COMPAT_VERSION; |
341 | bcast_packet->ttl = BATADV_TTL - 1; |
342 | |
343 | /* batman packet type: broadcast */ |
344 | bcast_packet->packet_type = BATADV_BCAST; |
345 | bcast_packet->reserved = 0; |
346 | |
347 | /* hw address of first interface is the orig mac because only |
348 | * this mac is known throughout the mesh |
349 | */ |
350 | ether_addr_copy(dst: bcast_packet->orig, |
351 | src: primary_if->net_dev->dev_addr); |
352 | |
353 | /* set broadcast sequence number */ |
354 | seqno = atomic_inc_return(v: &bat_priv->bcast_seqno); |
355 | bcast_packet->seqno = htonl(seqno); |
356 | |
357 | batadv_send_bcast_packet(bat_priv, skb, delay: brd_delay, own_packet: true); |
358 | /* unicast packet */ |
359 | } else { |
360 | /* DHCP packets going to a server will use the GW feature */ |
361 | if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { |
362 | ret = batadv_gw_out_of_range(bat_priv, skb); |
363 | if (ret) |
364 | goto dropped; |
365 | ret = batadv_send_skb_via_gw(bat_priv, skb, vid); |
366 | } else if (forw_mode == BATADV_FORW_UCASTS) { |
367 | ret = batadv_mcast_forw_send(bat_priv, skb, vid, |
368 | is_routable: mcast_is_routable); |
369 | } else if (forw_mode == BATADV_FORW_MCAST) { |
370 | ret = batadv_mcast_forw_mcsend(bat_priv, skb); |
371 | } else { |
372 | if (batadv_dat_snoop_outgoing_arp_request(bat_priv, |
373 | skb)) |
374 | goto dropped; |
375 | |
376 | batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); |
377 | |
378 | ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, |
379 | vid); |
380 | } |
381 | if (ret != NET_XMIT_SUCCESS) |
382 | goto dropped_freed; |
383 | } |
384 | |
385 | batadv_inc_counter(bat_priv, BATADV_CNT_TX); |
386 | batadv_add_counter(bat_priv, idx: BATADV_CNT_TX_BYTES, count: data_len); |
387 | goto end; |
388 | |
389 | dropped: |
390 | kfree_skb(skb); |
391 | dropped_freed: |
392 | batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); |
393 | end: |
394 | batadv_hardif_put(hard_iface: primary_if); |
395 | return NETDEV_TX_OK; |
396 | } |
397 | |
398 | /** |
399 | * batadv_interface_rx() - receive ethernet frame on local batman-adv interface |
400 | * @soft_iface: local interface which will receive the ethernet frame |
401 | * @skb: ethernet frame for @soft_iface |
402 | * @hdr_size: size of already parsed batman-adv header |
403 | * @orig_node: originator from which the batman-adv packet was sent |
404 | * |
405 | * Sends an ethernet frame to the receive path of the local @soft_iface. |
406 | * skb->data has still point to the batman-adv header with the size @hdr_size. |
407 | * The caller has to have parsed this header already and made sure that at least |
408 | * @hdr_size bytes are still available for pull in @skb. |
409 | * |
410 | * The packet may still get dropped. This can happen when the encapsulated |
411 | * ethernet frame is invalid or contains again an batman-adv packet. Also |
412 | * unicast packets will be dropped directly when it was sent between two |
413 | * isolated clients. |
414 | */ |
415 | void batadv_interface_rx(struct net_device *soft_iface, |
416 | struct sk_buff *skb, int hdr_size, |
417 | struct batadv_orig_node *orig_node) |
418 | { |
419 | struct batadv_bcast_packet *batadv_bcast_packet; |
420 | struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface); |
421 | struct vlan_ethhdr *vhdr; |
422 | struct ethhdr *ethhdr; |
423 | unsigned short vid; |
424 | int packet_type; |
425 | |
426 | batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; |
427 | packet_type = batadv_bcast_packet->packet_type; |
428 | |
429 | skb_pull_rcsum(skb, len: hdr_size); |
430 | skb_reset_mac_header(skb); |
431 | |
432 | /* clean the netfilter state now that the batman-adv header has been |
433 | * removed |
434 | */ |
435 | nf_reset_ct(skb); |
436 | |
437 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
438 | goto dropped; |
439 | |
440 | vid = batadv_get_vid(skb, header_len: 0); |
441 | ethhdr = eth_hdr(skb); |
442 | |
443 | switch (ntohs(ethhdr->h_proto)) { |
444 | case ETH_P_8021Q: |
445 | if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) |
446 | goto dropped; |
447 | |
448 | vhdr = skb_vlan_eth_hdr(skb); |
449 | |
450 | /* drop batman-in-batman packets to prevent loops */ |
451 | if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) |
452 | break; |
453 | |
454 | fallthrough; |
455 | case ETH_P_BATMAN: |
456 | goto dropped; |
457 | } |
458 | |
459 | /* skb->dev & skb->pkt_type are set here */ |
460 | skb->protocol = eth_type_trans(skb, dev: soft_iface); |
461 | skb_postpull_rcsum(skb, start: eth_hdr(skb), ETH_HLEN); |
462 | |
463 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
464 | batadv_add_counter(bat_priv, idx: BATADV_CNT_RX_BYTES, |
465 | count: skb->len + ETH_HLEN); |
466 | |
467 | /* Let the bridge loop avoidance check the packet. If will |
468 | * not handle it, we can safely push it up. |
469 | */ |
470 | if (batadv_bla_rx(bat_priv, skb, vid, packet_type)) |
471 | goto out; |
472 | |
473 | if (orig_node) |
474 | batadv_tt_add_temporary_global_entry(bat_priv, orig_node, |
475 | addr: ethhdr->h_source, vid); |
476 | |
477 | if (is_multicast_ether_addr(addr: ethhdr->h_dest)) { |
478 | /* set the mark on broadcast packets if AP isolation is ON and |
479 | * the packet is coming from an "isolated" client |
480 | */ |
481 | if (batadv_vlan_ap_isola_get(bat_priv, vid) && |
482 | batadv_tt_global_is_isolated(bat_priv, addr: ethhdr->h_source, |
483 | vid)) { |
484 | /* save bits in skb->mark not covered by the mask and |
485 | * apply the mark on the rest |
486 | */ |
487 | skb->mark &= ~bat_priv->isolation_mark_mask; |
488 | skb->mark |= bat_priv->isolation_mark; |
489 | } |
490 | } else if (batadv_is_ap_isolated(bat_priv, src: ethhdr->h_source, |
491 | dst: ethhdr->h_dest, vid)) { |
492 | goto dropped; |
493 | } |
494 | |
495 | netif_rx(skb); |
496 | goto out; |
497 | |
498 | dropped: |
499 | kfree_skb(skb); |
500 | out: |
501 | return; |
502 | } |
503 | |
504 | /** |
505 | * batadv_softif_vlan_release() - release vlan from lists and queue for free |
506 | * after rcu grace period |
507 | * @ref: kref pointer of the vlan object |
508 | */ |
509 | void batadv_softif_vlan_release(struct kref *ref) |
510 | { |
511 | struct batadv_softif_vlan *vlan; |
512 | |
513 | vlan = container_of(ref, struct batadv_softif_vlan, refcount); |
514 | |
515 | spin_lock_bh(lock: &vlan->bat_priv->softif_vlan_list_lock); |
516 | hlist_del_rcu(n: &vlan->list); |
517 | spin_unlock_bh(lock: &vlan->bat_priv->softif_vlan_list_lock); |
518 | |
519 | kfree_rcu(vlan, rcu); |
520 | } |
521 | |
522 | /** |
523 | * batadv_softif_vlan_get() - get the vlan object for a specific vid |
524 | * @bat_priv: the bat priv with all the soft interface information |
525 | * @vid: the identifier of the vlan object to retrieve |
526 | * |
527 | * Return: the private data of the vlan matching the vid passed as argument or |
528 | * NULL otherwise. The refcounter of the returned object is incremented by 1. |
529 | */ |
530 | struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, |
531 | unsigned short vid) |
532 | { |
533 | struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; |
534 | |
535 | rcu_read_lock(); |
536 | hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { |
537 | if (vlan_tmp->vid != vid) |
538 | continue; |
539 | |
540 | if (!kref_get_unless_zero(kref: &vlan_tmp->refcount)) |
541 | continue; |
542 | |
543 | vlan = vlan_tmp; |
544 | break; |
545 | } |
546 | rcu_read_unlock(); |
547 | |
548 | return vlan; |
549 | } |
550 | |
551 | /** |
552 | * batadv_softif_create_vlan() - allocate the needed resources for a new vlan |
553 | * @bat_priv: the bat priv with all the soft interface information |
554 | * @vid: the VLAN identifier |
555 | * |
556 | * Return: 0 on success, a negative error otherwise. |
557 | */ |
558 | int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) |
559 | { |
560 | struct batadv_softif_vlan *vlan; |
561 | |
562 | spin_lock_bh(lock: &bat_priv->softif_vlan_list_lock); |
563 | |
564 | vlan = batadv_softif_vlan_get(bat_priv, vid); |
565 | if (vlan) { |
566 | batadv_softif_vlan_put(vlan); |
567 | spin_unlock_bh(lock: &bat_priv->softif_vlan_list_lock); |
568 | return -EEXIST; |
569 | } |
570 | |
571 | vlan = kzalloc(size: sizeof(*vlan), GFP_ATOMIC); |
572 | if (!vlan) { |
573 | spin_unlock_bh(lock: &bat_priv->softif_vlan_list_lock); |
574 | return -ENOMEM; |
575 | } |
576 | |
577 | vlan->bat_priv = bat_priv; |
578 | vlan->vid = vid; |
579 | kref_init(kref: &vlan->refcount); |
580 | |
581 | atomic_set(v: &vlan->ap_isolation, i: 0); |
582 | |
583 | kref_get(kref: &vlan->refcount); |
584 | hlist_add_head_rcu(n: &vlan->list, h: &bat_priv->softif_vlan_list); |
585 | spin_unlock_bh(lock: &bat_priv->softif_vlan_list_lock); |
586 | |
587 | /* add a new TT local entry. This one will be marked with the NOPURGE |
588 | * flag |
589 | */ |
590 | batadv_tt_local_add(soft_iface: bat_priv->soft_iface, |
591 | addr: bat_priv->soft_iface->dev_addr, vid, |
592 | BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
593 | |
594 | /* don't return reference to new softif_vlan */ |
595 | batadv_softif_vlan_put(vlan); |
596 | |
597 | return 0; |
598 | } |
599 | |
600 | /** |
601 | * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object |
602 | * @bat_priv: the bat priv with all the soft interface information |
603 | * @vlan: the object to remove |
604 | */ |
605 | static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, |
606 | struct batadv_softif_vlan *vlan) |
607 | { |
608 | /* explicitly remove the associated TT local entry because it is marked |
609 | * with the NOPURGE flag |
610 | */ |
611 | batadv_tt_local_remove(bat_priv, addr: bat_priv->soft_iface->dev_addr, |
612 | vid: vlan->vid, message: "vlan interface destroyed" , roaming: false); |
613 | |
614 | batadv_softif_vlan_put(vlan); |
615 | } |
616 | |
617 | /** |
618 | * batadv_interface_add_vid() - ndo_add_vid API implementation |
619 | * @dev: the netdev of the mesh interface |
620 | * @proto: protocol of the vlan id |
621 | * @vid: identifier of the new vlan |
622 | * |
623 | * Set up all the internal structures for handling the new vlan on top of the |
624 | * mesh interface |
625 | * |
626 | * Return: 0 on success or a negative error code in case of failure. |
627 | */ |
628 | static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, |
629 | unsigned short vid) |
630 | { |
631 | struct batadv_priv *bat_priv = netdev_priv(dev); |
632 | struct batadv_softif_vlan *vlan; |
633 | |
634 | /* only 802.1Q vlans are supported. |
635 | * batman-adv does not know how to handle other types |
636 | */ |
637 | if (proto != htons(ETH_P_8021Q)) |
638 | return -EINVAL; |
639 | |
640 | vid |= BATADV_VLAN_HAS_TAG; |
641 | |
642 | /* if a new vlan is getting created and it already exists, it means that |
643 | * it was not deleted yet. batadv_softif_vlan_get() increases the |
644 | * refcount in order to revive the object. |
645 | * |
646 | * if it does not exist then create it. |
647 | */ |
648 | vlan = batadv_softif_vlan_get(bat_priv, vid); |
649 | if (!vlan) |
650 | return batadv_softif_create_vlan(bat_priv, vid); |
651 | |
652 | /* add a new TT local entry. This one will be marked with the NOPURGE |
653 | * flag. This must be added again, even if the vlan object already |
654 | * exists, because the entry was deleted by kill_vid() |
655 | */ |
656 | batadv_tt_local_add(soft_iface: bat_priv->soft_iface, |
657 | addr: bat_priv->soft_iface->dev_addr, vid, |
658 | BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
659 | |
660 | return 0; |
661 | } |
662 | |
663 | /** |
664 | * batadv_interface_kill_vid() - ndo_kill_vid API implementation |
665 | * @dev: the netdev of the mesh interface |
666 | * @proto: protocol of the vlan id |
667 | * @vid: identifier of the deleted vlan |
668 | * |
669 | * Destroy all the internal structures used to handle the vlan identified by vid |
670 | * on top of the mesh interface |
671 | * |
672 | * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q |
673 | * or -ENOENT if the specified vlan id wasn't registered. |
674 | */ |
675 | static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, |
676 | unsigned short vid) |
677 | { |
678 | struct batadv_priv *bat_priv = netdev_priv(dev); |
679 | struct batadv_softif_vlan *vlan; |
680 | |
681 | /* only 802.1Q vlans are supported. batman-adv does not know how to |
682 | * handle other types |
683 | */ |
684 | if (proto != htons(ETH_P_8021Q)) |
685 | return -EINVAL; |
686 | |
687 | vlan = batadv_softif_vlan_get(bat_priv, vid: vid | BATADV_VLAN_HAS_TAG); |
688 | if (!vlan) |
689 | return -ENOENT; |
690 | |
691 | batadv_softif_destroy_vlan(bat_priv, vlan); |
692 | |
693 | /* finally free the vlan object */ |
694 | batadv_softif_vlan_put(vlan); |
695 | |
696 | return 0; |
697 | } |
698 | |
699 | /* batman-adv network devices have devices nesting below it and are a special |
700 | * "super class" of normal network devices; split their locks off into a |
701 | * separate class since they always nest. |
702 | */ |
703 | static struct lock_class_key batadv_netdev_xmit_lock_key; |
704 | static struct lock_class_key batadv_netdev_addr_lock_key; |
705 | |
706 | /** |
707 | * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue |
708 | * @dev: device which owns the tx queue |
709 | * @txq: tx queue to modify |
710 | * @_unused: always NULL |
711 | */ |
712 | static void batadv_set_lockdep_class_one(struct net_device *dev, |
713 | struct netdev_queue *txq, |
714 | void *_unused) |
715 | { |
716 | lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); |
717 | } |
718 | |
719 | /** |
720 | * batadv_set_lockdep_class() - Set txq and addr_list lockdep class |
721 | * @dev: network device to modify |
722 | */ |
723 | static void batadv_set_lockdep_class(struct net_device *dev) |
724 | { |
725 | lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); |
726 | netdev_for_each_tx_queue(dev, f: batadv_set_lockdep_class_one, NULL); |
727 | } |
728 | |
729 | /** |
730 | * batadv_softif_init_late() - late stage initialization of soft interface |
731 | * @dev: registered network device to modify |
732 | * |
733 | * Return: error code on failures |
734 | */ |
735 | static int batadv_softif_init_late(struct net_device *dev) |
736 | { |
737 | struct batadv_priv *bat_priv; |
738 | u32 random_seqno; |
739 | int ret; |
740 | size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; |
741 | |
742 | batadv_set_lockdep_class(dev); |
743 | |
744 | bat_priv = netdev_priv(dev); |
745 | bat_priv->soft_iface = dev; |
746 | |
747 | /* batadv_interface_stats() needs to be available as soon as |
748 | * register_netdevice() has been called |
749 | */ |
750 | bat_priv->bat_counters = __alloc_percpu(size: cnt_len, align: __alignof__(u64)); |
751 | if (!bat_priv->bat_counters) |
752 | return -ENOMEM; |
753 | |
754 | atomic_set(v: &bat_priv->aggregated_ogms, i: 1); |
755 | atomic_set(v: &bat_priv->bonding, i: 0); |
756 | #ifdef CONFIG_BATMAN_ADV_BLA |
757 | atomic_set(v: &bat_priv->bridge_loop_avoidance, i: 1); |
758 | #endif |
759 | #ifdef CONFIG_BATMAN_ADV_DAT |
760 | atomic_set(v: &bat_priv->distributed_arp_table, i: 1); |
761 | #endif |
762 | #ifdef CONFIG_BATMAN_ADV_MCAST |
763 | atomic_set(v: &bat_priv->multicast_mode, i: 1); |
764 | atomic_set(v: &bat_priv->multicast_fanout, i: 16); |
765 | atomic_set(v: &bat_priv->mcast.num_want_all_unsnoopables, i: 0); |
766 | atomic_set(v: &bat_priv->mcast.num_want_all_ipv4, i: 0); |
767 | atomic_set(v: &bat_priv->mcast.num_want_all_ipv6, i: 0); |
768 | atomic_set(v: &bat_priv->mcast.num_no_mc_ptype_capa, i: 0); |
769 | #endif |
770 | atomic_set(v: &bat_priv->gw.mode, i: BATADV_GW_MODE_OFF); |
771 | atomic_set(v: &bat_priv->gw.bandwidth_down, i: 100); |
772 | atomic_set(v: &bat_priv->gw.bandwidth_up, i: 20); |
773 | atomic_set(v: &bat_priv->orig_interval, i: 1000); |
774 | atomic_set(v: &bat_priv->hop_penalty, i: 30); |
775 | #ifdef CONFIG_BATMAN_ADV_DEBUG |
776 | atomic_set(v: &bat_priv->log_level, i: 0); |
777 | #endif |
778 | atomic_set(v: &bat_priv->fragmentation, i: 1); |
779 | atomic_set(v: &bat_priv->packet_size_max, ETH_DATA_LEN); |
780 | atomic_set(v: &bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); |
781 | atomic_set(v: &bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); |
782 | |
783 | atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE); |
784 | atomic_set(v: &bat_priv->bcast_seqno, i: 1); |
785 | atomic_set(v: &bat_priv->tt.vn, i: 0); |
786 | atomic_set(v: &bat_priv->tt.local_changes, i: 0); |
787 | atomic_set(v: &bat_priv->tt.ogm_append_cnt, i: 0); |
788 | #ifdef CONFIG_BATMAN_ADV_BLA |
789 | atomic_set(v: &bat_priv->bla.num_requests, i: 0); |
790 | #endif |
791 | atomic_set(v: &bat_priv->tp_num, i: 0); |
792 | |
793 | bat_priv->tt.last_changeset = NULL; |
794 | bat_priv->tt.last_changeset_len = 0; |
795 | bat_priv->isolation_mark = 0; |
796 | bat_priv->isolation_mark_mask = 0; |
797 | |
798 | /* randomize initial seqno to avoid collision */ |
799 | get_random_bytes(buf: &random_seqno, len: sizeof(random_seqno)); |
800 | atomic_set(v: &bat_priv->frag_seqno, i: random_seqno); |
801 | |
802 | bat_priv->primary_if = NULL; |
803 | |
804 | batadv_nc_init_bat_priv(bat_priv); |
805 | |
806 | if (!bat_priv->algo_ops) { |
807 | ret = batadv_algo_select(bat_priv, name: batadv_routing_algo); |
808 | if (ret < 0) |
809 | goto free_bat_counters; |
810 | } |
811 | |
812 | ret = batadv_mesh_init(soft_iface: dev); |
813 | if (ret < 0) |
814 | goto free_bat_counters; |
815 | |
816 | return 0; |
817 | |
818 | free_bat_counters: |
819 | free_percpu(pdata: bat_priv->bat_counters); |
820 | bat_priv->bat_counters = NULL; |
821 | |
822 | return ret; |
823 | } |
824 | |
825 | /** |
826 | * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface |
827 | * @dev: batadv_soft_interface used as master interface |
828 | * @slave_dev: net_device which should become the slave interface |
829 | * @extack: extended ACK report struct |
830 | * |
831 | * Return: 0 if successful or error otherwise. |
832 | */ |
833 | static int batadv_softif_slave_add(struct net_device *dev, |
834 | struct net_device *slave_dev, |
835 | struct netlink_ext_ack *extack) |
836 | { |
837 | struct batadv_hard_iface *hard_iface; |
838 | int ret = -EINVAL; |
839 | |
840 | hard_iface = batadv_hardif_get_by_netdev(net_dev: slave_dev); |
841 | if (!hard_iface || hard_iface->soft_iface) |
842 | goto out; |
843 | |
844 | ret = batadv_hardif_enable_interface(hard_iface, soft_iface: dev); |
845 | |
846 | out: |
847 | batadv_hardif_put(hard_iface); |
848 | return ret; |
849 | } |
850 | |
851 | /** |
852 | * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface |
853 | * @dev: batadv_soft_interface used as master interface |
854 | * @slave_dev: net_device which should be removed from the master interface |
855 | * |
856 | * Return: 0 if successful or error otherwise. |
857 | */ |
858 | static int batadv_softif_slave_del(struct net_device *dev, |
859 | struct net_device *slave_dev) |
860 | { |
861 | struct batadv_hard_iface *hard_iface; |
862 | int ret = -EINVAL; |
863 | |
864 | hard_iface = batadv_hardif_get_by_netdev(net_dev: slave_dev); |
865 | |
866 | if (!hard_iface || hard_iface->soft_iface != dev) |
867 | goto out; |
868 | |
869 | batadv_hardif_disable_interface(hard_iface); |
870 | ret = 0; |
871 | |
872 | out: |
873 | batadv_hardif_put(hard_iface); |
874 | return ret; |
875 | } |
876 | |
877 | static const struct net_device_ops batadv_netdev_ops = { |
878 | .ndo_init = batadv_softif_init_late, |
879 | .ndo_open = batadv_interface_open, |
880 | .ndo_stop = batadv_interface_release, |
881 | .ndo_get_stats = batadv_interface_stats, |
882 | .ndo_vlan_rx_add_vid = batadv_interface_add_vid, |
883 | .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, |
884 | .ndo_set_mac_address = batadv_interface_set_mac_addr, |
885 | .ndo_change_mtu = batadv_interface_change_mtu, |
886 | .ndo_set_rx_mode = batadv_interface_set_rx_mode, |
887 | .ndo_start_xmit = batadv_interface_tx, |
888 | .ndo_validate_addr = eth_validate_addr, |
889 | .ndo_add_slave = batadv_softif_slave_add, |
890 | .ndo_del_slave = batadv_softif_slave_del, |
891 | }; |
892 | |
893 | static void batadv_get_drvinfo(struct net_device *dev, |
894 | struct ethtool_drvinfo *info) |
895 | { |
896 | strscpy(info->driver, "B.A.T.M.A.N. advanced" , sizeof(info->driver)); |
897 | strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); |
898 | strscpy(info->fw_version, "N/A" , sizeof(info->fw_version)); |
899 | strscpy(info->bus_info, "batman" , sizeof(info->bus_info)); |
900 | } |
901 | |
902 | /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 |
903 | * Declare each description string in struct.name[] to get fixed sized buffer |
904 | * and compile time checking for strings longer than ETH_GSTRING_LEN. |
905 | */ |
906 | static const struct { |
907 | const char name[ETH_GSTRING_LEN]; |
908 | } batadv_counters_strings[] = { |
909 | { "tx" }, |
910 | { "tx_bytes" }, |
911 | { "tx_dropped" }, |
912 | { "rx" }, |
913 | { "rx_bytes" }, |
914 | { "forward" }, |
915 | { "forward_bytes" }, |
916 | { "mgmt_tx" }, |
917 | { "mgmt_tx_bytes" }, |
918 | { "mgmt_rx" }, |
919 | { "mgmt_rx_bytes" }, |
920 | { "frag_tx" }, |
921 | { "frag_tx_bytes" }, |
922 | { "frag_rx" }, |
923 | { "frag_rx_bytes" }, |
924 | { "frag_fwd" }, |
925 | { "frag_fwd_bytes" }, |
926 | { "tt_request_tx" }, |
927 | { "tt_request_rx" }, |
928 | { "tt_response_tx" }, |
929 | { "tt_response_rx" }, |
930 | { "tt_roam_adv_tx" }, |
931 | { "tt_roam_adv_rx" }, |
932 | #ifdef CONFIG_BATMAN_ADV_MCAST |
933 | { "mcast_tx" }, |
934 | { "mcast_tx_bytes" }, |
935 | { "mcast_tx_local" }, |
936 | { "mcast_tx_local_bytes" }, |
937 | { "mcast_rx" }, |
938 | { "mcast_rx_bytes" }, |
939 | { "mcast_rx_local" }, |
940 | { "mcast_rx_local_bytes" }, |
941 | { "mcast_fwd" }, |
942 | { "mcast_fwd_bytes" }, |
943 | #endif |
944 | #ifdef CONFIG_BATMAN_ADV_DAT |
945 | { "dat_get_tx" }, |
946 | { "dat_get_rx" }, |
947 | { "dat_put_tx" }, |
948 | { "dat_put_rx" }, |
949 | { "dat_cached_reply_tx" }, |
950 | #endif |
951 | #ifdef CONFIG_BATMAN_ADV_NC |
952 | { "nc_code" }, |
953 | { "nc_code_bytes" }, |
954 | { "nc_recode" }, |
955 | { "nc_recode_bytes" }, |
956 | { "nc_buffer" }, |
957 | { "nc_decode" }, |
958 | { "nc_decode_bytes" }, |
959 | { "nc_decode_failed" }, |
960 | { "nc_sniffed" }, |
961 | #endif |
962 | }; |
963 | |
964 | static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
965 | { |
966 | if (stringset == ETH_SS_STATS) |
967 | memcpy(data, batadv_counters_strings, |
968 | sizeof(batadv_counters_strings)); |
969 | } |
970 | |
971 | static void batadv_get_ethtool_stats(struct net_device *dev, |
972 | struct ethtool_stats *stats, u64 *data) |
973 | { |
974 | struct batadv_priv *bat_priv = netdev_priv(dev); |
975 | int i; |
976 | |
977 | for (i = 0; i < BATADV_CNT_NUM; i++) |
978 | data[i] = batadv_sum_counter(bat_priv, idx: i); |
979 | } |
980 | |
981 | static int batadv_get_sset_count(struct net_device *dev, int stringset) |
982 | { |
983 | if (stringset == ETH_SS_STATS) |
984 | return BATADV_CNT_NUM; |
985 | |
986 | return -EOPNOTSUPP; |
987 | } |
988 | |
989 | static const struct ethtool_ops batadv_ethtool_ops = { |
990 | .get_drvinfo = batadv_get_drvinfo, |
991 | .get_link = ethtool_op_get_link, |
992 | .get_strings = batadv_get_strings, |
993 | .get_ethtool_stats = batadv_get_ethtool_stats, |
994 | .get_sset_count = batadv_get_sset_count, |
995 | }; |
996 | |
997 | /** |
998 | * batadv_softif_free() - Deconstructor of batadv_soft_interface |
999 | * @dev: Device to cleanup and remove |
1000 | */ |
1001 | static void batadv_softif_free(struct net_device *dev) |
1002 | { |
1003 | batadv_mesh_free(soft_iface: dev); |
1004 | |
1005 | /* some scheduled RCU callbacks need the bat_priv struct to accomplish |
1006 | * their tasks. Wait for them all to be finished before freeing the |
1007 | * netdev and its private data (bat_priv) |
1008 | */ |
1009 | rcu_barrier(); |
1010 | } |
1011 | |
1012 | /** |
1013 | * batadv_softif_init_early() - early stage initialization of soft interface |
1014 | * @dev: registered network device to modify |
1015 | */ |
1016 | static void batadv_softif_init_early(struct net_device *dev) |
1017 | { |
1018 | ether_setup(dev); |
1019 | |
1020 | dev->netdev_ops = &batadv_netdev_ops; |
1021 | dev->needs_free_netdev = true; |
1022 | dev->priv_destructor = batadv_softif_free; |
1023 | dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; |
1024 | dev->features |= NETIF_F_LLTX; |
1025 | dev->priv_flags |= IFF_NO_QUEUE; |
1026 | |
1027 | /* can't call min_mtu, because the needed variables |
1028 | * have not been initialized yet |
1029 | */ |
1030 | dev->mtu = ETH_DATA_LEN; |
1031 | |
1032 | /* generate random address */ |
1033 | eth_hw_addr_random(dev); |
1034 | |
1035 | dev->ethtool_ops = &batadv_ethtool_ops; |
1036 | } |
1037 | |
1038 | /** |
1039 | * batadv_softif_validate() - validate configuration of new batadv link |
1040 | * @tb: IFLA_INFO_DATA netlink attributes |
1041 | * @data: enum batadv_ifla_attrs attributes |
1042 | * @extack: extended ACK report struct |
1043 | * |
1044 | * Return: 0 if successful or error otherwise. |
1045 | */ |
1046 | static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[], |
1047 | struct netlink_ext_ack *extack) |
1048 | { |
1049 | struct batadv_algo_ops *algo_ops; |
1050 | |
1051 | if (!data) |
1052 | return 0; |
1053 | |
1054 | if (data[IFLA_BATADV_ALGO_NAME]) { |
1055 | algo_ops = batadv_algo_get(name: nla_data(nla: data[IFLA_BATADV_ALGO_NAME])); |
1056 | if (!algo_ops) |
1057 | return -EINVAL; |
1058 | } |
1059 | |
1060 | return 0; |
1061 | } |
1062 | |
1063 | /** |
1064 | * batadv_softif_newlink() - pre-initialize and register new batadv link |
1065 | * @src_net: the applicable net namespace |
1066 | * @dev: network device to register |
1067 | * @tb: IFLA_INFO_DATA netlink attributes |
1068 | * @data: enum batadv_ifla_attrs attributes |
1069 | * @extack: extended ACK report struct |
1070 | * |
1071 | * Return: 0 if successful or error otherwise. |
1072 | */ |
1073 | static int batadv_softif_newlink(struct net *src_net, struct net_device *dev, |
1074 | struct nlattr *tb[], struct nlattr *data[], |
1075 | struct netlink_ext_ack *extack) |
1076 | { |
1077 | struct batadv_priv *bat_priv = netdev_priv(dev); |
1078 | const char *algo_name; |
1079 | int err; |
1080 | |
1081 | if (data && data[IFLA_BATADV_ALGO_NAME]) { |
1082 | algo_name = nla_data(nla: data[IFLA_BATADV_ALGO_NAME]); |
1083 | err = batadv_algo_select(bat_priv, name: algo_name); |
1084 | if (err) |
1085 | return -EINVAL; |
1086 | } |
1087 | |
1088 | return register_netdevice(dev); |
1089 | } |
1090 | |
1091 | /** |
1092 | * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via |
1093 | * netlink |
1094 | * @soft_iface: the to-be-removed batman-adv interface |
1095 | * @head: list pointer |
1096 | */ |
1097 | static void batadv_softif_destroy_netlink(struct net_device *soft_iface, |
1098 | struct list_head *head) |
1099 | { |
1100 | struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface); |
1101 | struct batadv_hard_iface *hard_iface; |
1102 | struct batadv_softif_vlan *vlan; |
1103 | |
1104 | list_for_each_entry(hard_iface, &batadv_hardif_list, list) { |
1105 | if (hard_iface->soft_iface == soft_iface) |
1106 | batadv_hardif_disable_interface(hard_iface); |
1107 | } |
1108 | |
1109 | /* destroy the "untagged" VLAN */ |
1110 | vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); |
1111 | if (vlan) { |
1112 | batadv_softif_destroy_vlan(bat_priv, vlan); |
1113 | batadv_softif_vlan_put(vlan); |
1114 | } |
1115 | |
1116 | unregister_netdevice_queue(dev: soft_iface, head); |
1117 | } |
1118 | |
1119 | /** |
1120 | * batadv_softif_is_valid() - Check whether device is a batadv soft interface |
1121 | * @net_dev: device which should be checked |
1122 | * |
1123 | * Return: true when net_dev is a batman-adv interface, false otherwise |
1124 | */ |
1125 | bool batadv_softif_is_valid(const struct net_device *net_dev) |
1126 | { |
1127 | if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) |
1128 | return true; |
1129 | |
1130 | return false; |
1131 | } |
1132 | |
1133 | static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = { |
1134 | [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING }, |
1135 | }; |
1136 | |
1137 | struct rtnl_link_ops batadv_link_ops __read_mostly = { |
1138 | .kind = "batadv" , |
1139 | .priv_size = sizeof(struct batadv_priv), |
1140 | .setup = batadv_softif_init_early, |
1141 | .maxtype = IFLA_BATADV_MAX, |
1142 | .policy = batadv_ifla_policy, |
1143 | .validate = batadv_softif_validate, |
1144 | .newlink = batadv_softif_newlink, |
1145 | .dellink = batadv_softif_destroy_netlink, |
1146 | }; |
1147 | |