1 /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
2 *
3 * Marek Lindner, Simon Wunderlich
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include "main.h"
19 #include "soft-interface.h"
20 #include "hard-interface.h"
21 #include "distributed-arp-table.h"
22 #include "routing.h"
23 #include "send.h"
24 #include "debugfs.h"
25 #include "translation-table.h"
26 #include "hash.h"
27 #include "gateway_common.h"
28 #include "gateway_client.h"
29 #include "sysfs.h"
30 #include "originator.h"
31 #include <linux/slab.h>
32 #include <linux/ethtool.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_vlan.h>
35 #include "multicast.h"
36 #include "bridge_loop_avoidance.h"
37 #include "network-coding.h"
38
39 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
40 static void batadv_get_drvinfo(struct net_device *dev,
41 struct ethtool_drvinfo *info);
42 static u32 batadv_get_msglevel(struct net_device *dev);
43 static void batadv_set_msglevel(struct net_device *dev, u32 value);
44 static u32 batadv_get_link(struct net_device *dev);
45 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
46 static void batadv_get_ethtool_stats(struct net_device *dev,
47 struct ethtool_stats *stats, u64 *data);
48 static int batadv_get_sset_count(struct net_device *dev, int stringset);
49
50 static const struct ethtool_ops batadv_ethtool_ops = {
51 .get_settings = batadv_get_settings,
52 .get_drvinfo = batadv_get_drvinfo,
53 .get_msglevel = batadv_get_msglevel,
54 .set_msglevel = batadv_set_msglevel,
55 .get_link = batadv_get_link,
56 .get_strings = batadv_get_strings,
57 .get_ethtool_stats = batadv_get_ethtool_stats,
58 .get_sset_count = batadv_get_sset_count,
59 };
60
batadv_skb_head_push(struct sk_buff * skb,unsigned int len)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 to
67 * 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, len);
73 if (result < 0)
74 return result;
75
76 skb_push(skb, len);
77 return 0;
78 }
79
batadv_interface_open(struct net_device * dev)80 static int batadv_interface_open(struct net_device *dev)
81 {
82 netif_start_queue(dev);
83 return 0;
84 }
85
batadv_interface_release(struct net_device * dev)86 static int batadv_interface_release(struct net_device *dev)
87 {
88 netif_stop_queue(dev);
89 return 0;
90 }
91
batadv_interface_stats(struct net_device * dev)92 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
93 {
94 struct batadv_priv *bat_priv = netdev_priv(dev);
95 struct net_device_stats *stats = &bat_priv->stats;
96
97 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
98 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
99 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
100 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
101 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
102 return stats;
103 }
104
batadv_interface_set_mac_addr(struct net_device * dev,void * p)105 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
106 {
107 struct batadv_priv *bat_priv = netdev_priv(dev);
108 struct sockaddr *addr = p;
109 uint8_t old_addr[ETH_ALEN];
110
111 if (!is_valid_ether_addr(addr->sa_data))
112 return -EADDRNOTAVAIL;
113
114 ether_addr_copy(old_addr, dev->dev_addr);
115 ether_addr_copy(dev->dev_addr, addr->sa_data);
116
117 /* only modify transtable if it has been initialized before */
118 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) {
119 batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS,
120 "mac address changed", false);
121 batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS,
122 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
123 }
124
125 return 0;
126 }
127
batadv_interface_change_mtu(struct net_device * dev,int new_mtu)128 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
129 {
130 /* check ranges */
131 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
132 return -EINVAL;
133
134 dev->mtu = new_mtu;
135
136 return 0;
137 }
138
139 /**
140 * batadv_interface_set_rx_mode - set the rx mode of a device
141 * @dev: registered network device to modify
142 *
143 * We do not actually need to set any rx filters for the virtual batman
144 * soft interface. However a dummy handler enables a user to set static
145 * multicast listeners for instance.
146 */
batadv_interface_set_rx_mode(struct net_device * dev)147 static void batadv_interface_set_rx_mode(struct net_device *dev)
148 {
149 }
150
batadv_interface_tx(struct sk_buff * skb,struct net_device * soft_iface)151 static int batadv_interface_tx(struct sk_buff *skb,
152 struct net_device *soft_iface)
153 {
154 struct ethhdr *ethhdr;
155 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
156 struct batadv_hard_iface *primary_if = NULL;
157 struct batadv_bcast_packet *bcast_packet;
158 __be16 ethertype = htons(ETH_P_BATMAN);
159 static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
160 0x00, 0x00};
161 static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
162 0x00, 0x00};
163 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
164 uint8_t *dst_hint = NULL, chaddr[ETH_ALEN];
165 struct vlan_ethhdr *vhdr;
166 unsigned int header_len = 0;
167 int data_len = skb->len, ret;
168 unsigned long brd_delay = 1;
169 bool do_bcast = false, client_added;
170 unsigned short vid;
171 uint32_t seqno;
172 int gw_mode;
173 enum batadv_forw_mode forw_mode;
174 struct batadv_orig_node *mcast_single_orig = NULL;
175 int network_offset = ETH_HLEN;
176
177 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
178 goto dropped;
179
180 soft_iface->trans_start = jiffies;
181 vid = batadv_get_vid(skb, 0);
182 ethhdr = eth_hdr(skb);
183
184 switch (ntohs(ethhdr->h_proto)) {
185 case ETH_P_8021Q:
186 vhdr = vlan_eth_hdr(skb);
187
188 if (vhdr->h_vlan_encapsulated_proto != ethertype) {
189 network_offset += VLAN_HLEN;
190 break;
191 }
192
193 /* fall through */
194 case ETH_P_BATMAN:
195 goto dropped;
196 }
197
198 skb_set_network_header(skb, network_offset);
199
200 if (batadv_bla_tx(bat_priv, skb, vid))
201 goto dropped;
202
203 /* skb->data might have been reallocated by batadv_bla_tx() */
204 ethhdr = eth_hdr(skb);
205
206 /* Register the client MAC in the transtable */
207 if (!is_multicast_ether_addr(ethhdr->h_source)) {
208 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
209 vid, skb->skb_iif,
210 skb->mark);
211 if (!client_added)
212 goto dropped;
213 }
214
215 /* don't accept stp packets. STP does not help in meshes.
216 * better use the bridge loop avoidance ...
217 *
218 * The same goes for ECTP sent at least by some Cisco Switches,
219 * it might confuse the mesh when used with bridge loop avoidance.
220 */
221 if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
222 goto dropped;
223
224 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
225 goto dropped;
226
227 gw_mode = atomic_read(&bat_priv->gw_mode);
228 if (is_multicast_ether_addr(ethhdr->h_dest)) {
229 /* if gw mode is off, broadcast every packet */
230 if (gw_mode == BATADV_GW_MODE_OFF) {
231 do_bcast = true;
232 goto send;
233 }
234
235 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
236 chaddr);
237 /* skb->data may have been modified by
238 * batadv_gw_dhcp_recipient_get()
239 */
240 ethhdr = eth_hdr(skb);
241 /* if gw_mode is on, broadcast any non-DHCP message.
242 * All the DHCP packets are going to be sent as unicast
243 */
244 if (dhcp_rcp == BATADV_DHCP_NO) {
245 do_bcast = true;
246 goto send;
247 }
248
249 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
250 dst_hint = chaddr;
251 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
252 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
253 /* gateways should not forward any DHCP message if
254 * directed to a DHCP server
255 */
256 goto dropped;
257
258 send:
259 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
260 forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
261 &mcast_single_orig);
262 if (forw_mode == BATADV_FORW_NONE)
263 goto dropped;
264
265 if (forw_mode == BATADV_FORW_SINGLE)
266 do_bcast = false;
267 }
268 }
269
270 batadv_skb_set_priority(skb, 0);
271
272 /* ethernet packet should be broadcasted */
273 if (do_bcast) {
274 primary_if = batadv_primary_if_get_selected(bat_priv);
275 if (!primary_if)
276 goto dropped;
277
278 /* in case of ARP request, we do not immediately broadcasti the
279 * packet, instead we first wait for DAT to try to retrieve the
280 * correct ARP entry
281 */
282 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
283 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
284
285 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
286 goto dropped;
287
288 bcast_packet = (struct batadv_bcast_packet *)skb->data;
289 bcast_packet->version = BATADV_COMPAT_VERSION;
290 bcast_packet->ttl = BATADV_TTL;
291
292 /* batman packet type: broadcast */
293 bcast_packet->packet_type = BATADV_BCAST;
294 bcast_packet->reserved = 0;
295
296 /* hw address of first interface is the orig mac because only
297 * this mac is known throughout the mesh
298 */
299 ether_addr_copy(bcast_packet->orig,
300 primary_if->net_dev->dev_addr);
301
302 /* set broadcast sequence number */
303 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
304 bcast_packet->seqno = htonl(seqno);
305
306 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
307
308 /* a copy is stored in the bcast list, therefore removing
309 * the original skb.
310 */
311 kfree_skb(skb);
312
313 /* unicast packet */
314 } else {
315 /* DHCP packets going to a server will use the GW feature */
316 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
317 ret = batadv_gw_out_of_range(bat_priv, skb);
318 if (ret)
319 goto dropped;
320 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
321 } else if (mcast_single_orig) {
322 ret = batadv_send_skb_unicast(bat_priv, skb,
323 BATADV_UNICAST, 0,
324 mcast_single_orig, vid);
325 } else {
326 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
327 skb))
328 goto dropped;
329
330 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
331
332 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
333 vid);
334 }
335 if (ret == NET_XMIT_DROP)
336 goto dropped_freed;
337 }
338
339 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
340 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
341 goto end;
342
343 dropped:
344 kfree_skb(skb);
345 dropped_freed:
346 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
347 end:
348 if (primary_if)
349 batadv_hardif_free_ref(primary_if);
350 return NETDEV_TX_OK;
351 }
352
batadv_interface_rx(struct net_device * soft_iface,struct sk_buff * skb,struct batadv_hard_iface * recv_if,int hdr_size,struct batadv_orig_node * orig_node)353 void batadv_interface_rx(struct net_device *soft_iface,
354 struct sk_buff *skb, struct batadv_hard_iface *recv_if,
355 int hdr_size, struct batadv_orig_node *orig_node)
356 {
357 struct batadv_bcast_packet *batadv_bcast_packet;
358 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
359 __be16 ethertype = htons(ETH_P_BATMAN);
360 struct vlan_ethhdr *vhdr;
361 struct ethhdr *ethhdr;
362 unsigned short vid;
363 bool is_bcast;
364
365 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
366 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
367
368 /* check if enough space is available for pulling, and pull */
369 if (!pskb_may_pull(skb, hdr_size))
370 goto dropped;
371
372 skb_pull_rcsum(skb, hdr_size);
373 skb_reset_mac_header(skb);
374
375 /* clean the netfilter state now that the batman-adv header has been
376 * removed
377 */
378 nf_reset(skb);
379
380 vid = batadv_get_vid(skb, 0);
381 ethhdr = eth_hdr(skb);
382
383 switch (ntohs(ethhdr->h_proto)) {
384 case ETH_P_8021Q:
385 vhdr = (struct vlan_ethhdr *)skb->data;
386
387 if (vhdr->h_vlan_encapsulated_proto != ethertype)
388 break;
389
390 /* fall through */
391 case ETH_P_BATMAN:
392 goto dropped;
393 }
394
395 /* skb->dev & skb->pkt_type are set here */
396 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
397 goto dropped;
398 skb->protocol = eth_type_trans(skb, soft_iface);
399
400 /* should not be necessary anymore as we use skb_pull_rcsum()
401 * TODO: please verify this and remove this TODO
402 * -- Dec 21st 2009, Simon Wunderlich
403 */
404
405 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
406
407 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
408 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
409 skb->len + ETH_HLEN);
410
411 soft_iface->last_rx = jiffies;
412
413 /* Let the bridge loop avoidance check the packet. If will
414 * not handle it, we can safely push it up.
415 */
416 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
417 goto out;
418
419 if (orig_node)
420 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
421 ethhdr->h_source, vid);
422
423 if (is_multicast_ether_addr(ethhdr->h_dest)) {
424 /* set the mark on broadcast packets if AP isolation is ON and
425 * the packet is coming from an "isolated" client
426 */
427 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
428 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
429 vid)) {
430 /* save bits in skb->mark not covered by the mask and
431 * apply the mark on the rest
432 */
433 skb->mark &= ~bat_priv->isolation_mark_mask;
434 skb->mark |= bat_priv->isolation_mark;
435 }
436 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
437 ethhdr->h_dest, vid)) {
438 goto dropped;
439 }
440
441 netif_rx(skb);
442 goto out;
443
444 dropped:
445 kfree_skb(skb);
446 out:
447 return;
448 }
449
450 /**
451 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
452 * possibly free it
453 * @softif_vlan: the vlan object to release
454 */
batadv_softif_vlan_free_ref(struct batadv_softif_vlan * vlan)455 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
456 {
457 if (!vlan)
458 return;
459
460 if (atomic_dec_and_test(&vlan->refcount)) {
461 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
462 hlist_del_rcu(&vlan->list);
463 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
464
465 kfree_rcu(vlan, rcu);
466 }
467 }
468
469 /**
470 * batadv_softif_vlan_get - get the vlan object for a specific vid
471 * @bat_priv: the bat priv with all the soft interface information
472 * @vid: the identifier of the vlan object to retrieve
473 *
474 * Returns the private data of the vlan matching the vid passed as argument or
475 * NULL otherwise. The refcounter of the returned object is incremented by 1.
476 */
batadv_softif_vlan_get(struct batadv_priv * bat_priv,unsigned short vid)477 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
478 unsigned short vid)
479 {
480 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
481
482 rcu_read_lock();
483 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
484 if (vlan_tmp->vid != vid)
485 continue;
486
487 if (!atomic_inc_not_zero(&vlan_tmp->refcount))
488 continue;
489
490 vlan = vlan_tmp;
491 break;
492 }
493 rcu_read_unlock();
494
495 return vlan;
496 }
497
498 /**
499 * batadv_create_vlan - allocate the needed resources for a new vlan
500 * @bat_priv: the bat priv with all the soft interface information
501 * @vid: the VLAN identifier
502 *
503 * Returns 0 on success, a negative error otherwise.
504 */
batadv_softif_create_vlan(struct batadv_priv * bat_priv,unsigned short vid)505 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
506 {
507 struct batadv_softif_vlan *vlan;
508 int err;
509
510 vlan = batadv_softif_vlan_get(bat_priv, vid);
511 if (vlan) {
512 batadv_softif_vlan_free_ref(vlan);
513 return -EEXIST;
514 }
515
516 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
517 if (!vlan)
518 return -ENOMEM;
519
520 vlan->bat_priv = bat_priv;
521 vlan->vid = vid;
522 atomic_set(&vlan->refcount, 1);
523
524 atomic_set(&vlan->ap_isolation, 0);
525
526 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
527 if (err) {
528 kfree(vlan);
529 return err;
530 }
531
532 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
533 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
534 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
535
536 /* add a new TT local entry. This one will be marked with the NOPURGE
537 * flag
538 */
539 batadv_tt_local_add(bat_priv->soft_iface,
540 bat_priv->soft_iface->dev_addr, vid,
541 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
542
543 return 0;
544 }
545
546 /**
547 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
548 * @bat_priv: the bat priv with all the soft interface information
549 * @vlan: the object to remove
550 */
batadv_softif_destroy_vlan(struct batadv_priv * bat_priv,struct batadv_softif_vlan * vlan)551 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
552 struct batadv_softif_vlan *vlan)
553 {
554 /* explicitly remove the associated TT local entry because it is marked
555 * with the NOPURGE flag
556 */
557 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
558 vlan->vid, "vlan interface destroyed", false);
559
560 batadv_sysfs_del_vlan(bat_priv, vlan);
561 batadv_softif_vlan_free_ref(vlan);
562 }
563
564 /**
565 * batadv_interface_add_vid - ndo_add_vid API implementation
566 * @dev: the netdev of the mesh interface
567 * @vid: identifier of the new vlan
568 *
569 * Set up all the internal structures for handling the new vlan on top of the
570 * mesh interface
571 *
572 * Returns 0 on success or a negative error code in case of failure.
573 */
batadv_interface_add_vid(struct net_device * dev,__be16 proto,unsigned short vid)574 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
575 unsigned short vid)
576 {
577 struct batadv_priv *bat_priv = netdev_priv(dev);
578 struct batadv_softif_vlan *vlan;
579 int ret;
580
581 /* only 802.1Q vlans are supported.
582 * batman-adv does not know how to handle other types
583 */
584 if (proto != htons(ETH_P_8021Q))
585 return -EINVAL;
586
587 vid |= BATADV_VLAN_HAS_TAG;
588
589 /* if a new vlan is getting created and it already exists, it means that
590 * it was not deleted yet. batadv_softif_vlan_get() increases the
591 * refcount in order to revive the object.
592 *
593 * if it does not exist then create it.
594 */
595 vlan = batadv_softif_vlan_get(bat_priv, vid);
596 if (!vlan)
597 return batadv_softif_create_vlan(bat_priv, vid);
598
599 /* recreate the sysfs object if it was already destroyed (and it should
600 * be since we received a kill_vid() for this vlan
601 */
602 if (!vlan->kobj) {
603 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
604 if (ret) {
605 batadv_softif_vlan_free_ref(vlan);
606 return ret;
607 }
608 }
609
610 /* add a new TT local entry. This one will be marked with the NOPURGE
611 * flag. This must be added again, even if the vlan object already
612 * exists, because the entry was deleted by kill_vid()
613 */
614 batadv_tt_local_add(bat_priv->soft_iface,
615 bat_priv->soft_iface->dev_addr, vid,
616 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
617
618 return 0;
619 }
620
621 /**
622 * batadv_interface_kill_vid - ndo_kill_vid API implementation
623 * @dev: the netdev of the mesh interface
624 * @vid: identifier of the deleted vlan
625 *
626 * Destroy all the internal structures used to handle the vlan identified by vid
627 * on top of the mesh interface
628 *
629 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
630 * or -ENOENT if the specified vlan id wasn't registered.
631 */
batadv_interface_kill_vid(struct net_device * dev,__be16 proto,unsigned short vid)632 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
633 unsigned short vid)
634 {
635 struct batadv_priv *bat_priv = netdev_priv(dev);
636 struct batadv_softif_vlan *vlan;
637
638 /* only 802.1Q vlans are supported. batman-adv does not know how to
639 * handle other types
640 */
641 if (proto != htons(ETH_P_8021Q))
642 return -EINVAL;
643
644 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
645 if (!vlan)
646 return -ENOENT;
647
648 batadv_softif_destroy_vlan(bat_priv, vlan);
649
650 /* finally free the vlan object */
651 batadv_softif_vlan_free_ref(vlan);
652
653 return 0;
654 }
655
656 /* batman-adv network devices have devices nesting below it and are a special
657 * "super class" of normal network devices; split their locks off into a
658 * separate class since they always nest.
659 */
660 static struct lock_class_key batadv_netdev_xmit_lock_key;
661 static struct lock_class_key batadv_netdev_addr_lock_key;
662
663 /**
664 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
665 * @dev: device which owns the tx queue
666 * @txq: tx queue to modify
667 * @_unused: always NULL
668 */
batadv_set_lockdep_class_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)669 static void batadv_set_lockdep_class_one(struct net_device *dev,
670 struct netdev_queue *txq,
671 void *_unused)
672 {
673 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
674 }
675
676 /**
677 * batadv_set_lockdep_class - Set txq and addr_list lockdep class
678 * @dev: network device to modify
679 */
batadv_set_lockdep_class(struct net_device * dev)680 static void batadv_set_lockdep_class(struct net_device *dev)
681 {
682 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
683 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
684 }
685
686 /**
687 * batadv_softif_destroy_finish - cleans up the remains of a softif
688 * @work: work queue item
689 *
690 * Free the parts of the soft interface which can not be removed under
691 * rtnl lock (to prevent deadlock situations).
692 */
batadv_softif_destroy_finish(struct work_struct * work)693 static void batadv_softif_destroy_finish(struct work_struct *work)
694 {
695 struct batadv_softif_vlan *vlan;
696 struct batadv_priv *bat_priv;
697 struct net_device *soft_iface;
698
699 bat_priv = container_of(work, struct batadv_priv,
700 cleanup_work);
701 soft_iface = bat_priv->soft_iface;
702
703 /* destroy the "untagged" VLAN */
704 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
705 if (vlan) {
706 batadv_softif_destroy_vlan(bat_priv, vlan);
707 batadv_softif_vlan_free_ref(vlan);
708 }
709
710 batadv_sysfs_del_meshif(soft_iface);
711 unregister_netdev(soft_iface);
712 }
713
714 /**
715 * batadv_softif_init_late - late stage initialization of soft interface
716 * @dev: registered network device to modify
717 *
718 * Returns error code on failures
719 */
batadv_softif_init_late(struct net_device * dev)720 static int batadv_softif_init_late(struct net_device *dev)
721 {
722 struct batadv_priv *bat_priv;
723 uint32_t random_seqno;
724 int ret;
725 size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
726
727 batadv_set_lockdep_class(dev);
728
729 bat_priv = netdev_priv(dev);
730 bat_priv->soft_iface = dev;
731 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
732
733 /* batadv_interface_stats() needs to be available as soon as
734 * register_netdevice() has been called
735 */
736 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
737 if (!bat_priv->bat_counters)
738 return -ENOMEM;
739
740 atomic_set(&bat_priv->aggregated_ogms, 1);
741 atomic_set(&bat_priv->bonding, 0);
742 #ifdef CONFIG_BATMAN_ADV_BLA
743 atomic_set(&bat_priv->bridge_loop_avoidance, 0);
744 #endif
745 #ifdef CONFIG_BATMAN_ADV_DAT
746 atomic_set(&bat_priv->distributed_arp_table, 1);
747 #endif
748 #ifdef CONFIG_BATMAN_ADV_MCAST
749 bat_priv->mcast.flags = BATADV_NO_FLAGS;
750 atomic_set(&bat_priv->multicast_mode, 1);
751 atomic_set(&bat_priv->mcast.num_disabled, 0);
752 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
753 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
754 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
755 #endif
756 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
757 atomic_set(&bat_priv->gw_sel_class, 20);
758 atomic_set(&bat_priv->gw.bandwidth_down, 100);
759 atomic_set(&bat_priv->gw.bandwidth_up, 20);
760 atomic_set(&bat_priv->orig_interval, 1000);
761 atomic_set(&bat_priv->hop_penalty, 30);
762 #ifdef CONFIG_BATMAN_ADV_DEBUG
763 atomic_set(&bat_priv->log_level, 0);
764 #endif
765 atomic_set(&bat_priv->fragmentation, 1);
766 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
767 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
768 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
769
770 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
771 atomic_set(&bat_priv->bcast_seqno, 1);
772 atomic_set(&bat_priv->tt.vn, 0);
773 atomic_set(&bat_priv->tt.local_changes, 0);
774 atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
775 #ifdef CONFIG_BATMAN_ADV_BLA
776 atomic_set(&bat_priv->bla.num_requests, 0);
777 #endif
778 bat_priv->tt.last_changeset = NULL;
779 bat_priv->tt.last_changeset_len = 0;
780 bat_priv->isolation_mark = 0;
781 bat_priv->isolation_mark_mask = 0;
782
783 /* randomize initial seqno to avoid collision */
784 get_random_bytes(&random_seqno, sizeof(random_seqno));
785 atomic_set(&bat_priv->frag_seqno, random_seqno);
786
787 bat_priv->primary_if = NULL;
788 bat_priv->num_ifaces = 0;
789
790 batadv_nc_init_bat_priv(bat_priv);
791
792 ret = batadv_algo_select(bat_priv, batadv_routing_algo);
793 if (ret < 0)
794 goto free_bat_counters;
795
796 ret = batadv_debugfs_add_meshif(dev);
797 if (ret < 0)
798 goto free_bat_counters;
799
800 ret = batadv_mesh_init(dev);
801 if (ret < 0)
802 goto unreg_debugfs;
803
804 return 0;
805
806 unreg_debugfs:
807 batadv_debugfs_del_meshif(dev);
808 free_bat_counters:
809 free_percpu(bat_priv->bat_counters);
810 bat_priv->bat_counters = NULL;
811
812 return ret;
813 }
814
815 /**
816 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
817 * @dev: batadv_soft_interface used as master interface
818 * @slave_dev: net_device which should become the slave interface
819 *
820 * Return 0 if successful or error otherwise.
821 */
batadv_softif_slave_add(struct net_device * dev,struct net_device * slave_dev)822 static int batadv_softif_slave_add(struct net_device *dev,
823 struct net_device *slave_dev)
824 {
825 struct batadv_hard_iface *hard_iface;
826 int ret = -EINVAL;
827
828 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
829 if (!hard_iface || hard_iface->soft_iface != NULL)
830 goto out;
831
832 ret = batadv_hardif_enable_interface(hard_iface, dev->name);
833
834 out:
835 if (hard_iface)
836 batadv_hardif_free_ref(hard_iface);
837 return ret;
838 }
839
840 /**
841 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
842 * @dev: batadv_soft_interface used as master interface
843 * @slave_dev: net_device which should be removed from the master interface
844 *
845 * Return 0 if successful or error otherwise.
846 */
batadv_softif_slave_del(struct net_device * dev,struct net_device * slave_dev)847 static int batadv_softif_slave_del(struct net_device *dev,
848 struct net_device *slave_dev)
849 {
850 struct batadv_hard_iface *hard_iface;
851 int ret = -EINVAL;
852
853 hard_iface = batadv_hardif_get_by_netdev(slave_dev);
854
855 if (!hard_iface || hard_iface->soft_iface != dev)
856 goto out;
857
858 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
859 ret = 0;
860
861 out:
862 if (hard_iface)
863 batadv_hardif_free_ref(hard_iface);
864 return ret;
865 }
866
867 static const struct net_device_ops batadv_netdev_ops = {
868 .ndo_init = batadv_softif_init_late,
869 .ndo_open = batadv_interface_open,
870 .ndo_stop = batadv_interface_release,
871 .ndo_get_stats = batadv_interface_stats,
872 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
873 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
874 .ndo_set_mac_address = batadv_interface_set_mac_addr,
875 .ndo_change_mtu = batadv_interface_change_mtu,
876 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
877 .ndo_start_xmit = batadv_interface_tx,
878 .ndo_validate_addr = eth_validate_addr,
879 .ndo_add_slave = batadv_softif_slave_add,
880 .ndo_del_slave = batadv_softif_slave_del,
881 };
882
883 /**
884 * batadv_softif_free - Deconstructor of batadv_soft_interface
885 * @dev: Device to cleanup and remove
886 */
batadv_softif_free(struct net_device * dev)887 static void batadv_softif_free(struct net_device *dev)
888 {
889 batadv_debugfs_del_meshif(dev);
890 batadv_mesh_free(dev);
891
892 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
893 * their tasks. Wait for them all to be finished before freeing the
894 * netdev and its private data (bat_priv)
895 */
896 rcu_barrier();
897
898 free_netdev(dev);
899 }
900
901 /**
902 * batadv_softif_init_early - early stage initialization of soft interface
903 * @dev: registered network device to modify
904 */
batadv_softif_init_early(struct net_device * dev)905 static void batadv_softif_init_early(struct net_device *dev)
906 {
907 struct batadv_priv *priv = netdev_priv(dev);
908
909 ether_setup(dev);
910
911 dev->netdev_ops = &batadv_netdev_ops;
912 dev->destructor = batadv_softif_free;
913 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
914 dev->tx_queue_len = 0;
915
916 /* can't call min_mtu, because the needed variables
917 * have not been initialized yet
918 */
919 dev->mtu = ETH_DATA_LEN;
920 /* reserve more space in the skbuff for our header */
921 dev->hard_header_len = batadv_max_header_len();
922
923 /* generate random address */
924 eth_hw_addr_random(dev);
925
926 dev->ethtool_ops = &batadv_ethtool_ops;
927
928 memset(priv, 0, sizeof(*priv));
929 }
930
batadv_softif_create(const char * name)931 struct net_device *batadv_softif_create(const char *name)
932 {
933 struct net_device *soft_iface;
934 int ret;
935
936 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
937 NET_NAME_UNKNOWN, batadv_softif_init_early);
938 if (!soft_iface)
939 return NULL;
940
941 soft_iface->rtnl_link_ops = &batadv_link_ops;
942
943 ret = register_netdevice(soft_iface);
944 if (ret < 0) {
945 pr_err("Unable to register the batman interface '%s': %i\n",
946 name, ret);
947 free_netdev(soft_iface);
948 return NULL;
949 }
950
951 return soft_iface;
952 }
953
954 /**
955 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
956 * @soft_iface: the to-be-removed batman-adv interface
957 */
batadv_softif_destroy_sysfs(struct net_device * soft_iface)958 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
959 {
960 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
961
962 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
963 }
964
965 /**
966 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
967 * @soft_iface: the to-be-removed batman-adv interface
968 * @head: list pointer
969 */
batadv_softif_destroy_netlink(struct net_device * soft_iface,struct list_head * head)970 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
971 struct list_head *head)
972 {
973 struct batadv_hard_iface *hard_iface;
974
975 list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
976 if (hard_iface->soft_iface == soft_iface)
977 batadv_hardif_disable_interface(hard_iface,
978 BATADV_IF_CLEANUP_KEEP);
979 }
980
981 batadv_sysfs_del_meshif(soft_iface);
982 unregister_netdevice_queue(soft_iface, head);
983 }
984
batadv_softif_is_valid(const struct net_device * net_dev)985 int batadv_softif_is_valid(const struct net_device *net_dev)
986 {
987 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
988 return 1;
989
990 return 0;
991 }
992
993 struct rtnl_link_ops batadv_link_ops __read_mostly = {
994 .kind = "batadv",
995 .priv_size = sizeof(struct batadv_priv),
996 .setup = batadv_softif_init_early,
997 .dellink = batadv_softif_destroy_netlink,
998 };
999
1000 /* ethtool */
batadv_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)1001 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1002 {
1003 cmd->supported = 0;
1004 cmd->advertising = 0;
1005 ethtool_cmd_speed_set(cmd, SPEED_10);
1006 cmd->duplex = DUPLEX_FULL;
1007 cmd->port = PORT_TP;
1008 cmd->phy_address = 0;
1009 cmd->transceiver = XCVR_INTERNAL;
1010 cmd->autoneg = AUTONEG_DISABLE;
1011 cmd->maxtxpkt = 0;
1012 cmd->maxrxpkt = 0;
1013
1014 return 0;
1015 }
1016
batadv_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1017 static void batadv_get_drvinfo(struct net_device *dev,
1018 struct ethtool_drvinfo *info)
1019 {
1020 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1021 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1022 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1023 strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1024 }
1025
batadv_get_msglevel(struct net_device * dev)1026 static u32 batadv_get_msglevel(struct net_device *dev)
1027 {
1028 return -EOPNOTSUPP;
1029 }
1030
batadv_set_msglevel(struct net_device * dev,u32 value)1031 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1032 {
1033 }
1034
batadv_get_link(struct net_device * dev)1035 static u32 batadv_get_link(struct net_device *dev)
1036 {
1037 return 1;
1038 }
1039
1040 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1041 * Declare each description string in struct.name[] to get fixed sized buffer
1042 * and compile time checking for strings longer than ETH_GSTRING_LEN.
1043 */
1044 static const struct {
1045 const char name[ETH_GSTRING_LEN];
1046 } batadv_counters_strings[] = {
1047 { "tx" },
1048 { "tx_bytes" },
1049 { "tx_dropped" },
1050 { "rx" },
1051 { "rx_bytes" },
1052 { "forward" },
1053 { "forward_bytes" },
1054 { "mgmt_tx" },
1055 { "mgmt_tx_bytes" },
1056 { "mgmt_rx" },
1057 { "mgmt_rx_bytes" },
1058 { "frag_tx" },
1059 { "frag_tx_bytes" },
1060 { "frag_rx" },
1061 { "frag_rx_bytes" },
1062 { "frag_fwd" },
1063 { "frag_fwd_bytes" },
1064 { "tt_request_tx" },
1065 { "tt_request_rx" },
1066 { "tt_response_tx" },
1067 { "tt_response_rx" },
1068 { "tt_roam_adv_tx" },
1069 { "tt_roam_adv_rx" },
1070 #ifdef CONFIG_BATMAN_ADV_DAT
1071 { "dat_get_tx" },
1072 { "dat_get_rx" },
1073 { "dat_put_tx" },
1074 { "dat_put_rx" },
1075 { "dat_cached_reply_tx" },
1076 #endif
1077 #ifdef CONFIG_BATMAN_ADV_NC
1078 { "nc_code" },
1079 { "nc_code_bytes" },
1080 { "nc_recode" },
1081 { "nc_recode_bytes" },
1082 { "nc_buffer" },
1083 { "nc_decode" },
1084 { "nc_decode_bytes" },
1085 { "nc_decode_failed" },
1086 { "nc_sniffed" },
1087 #endif
1088 };
1089
batadv_get_strings(struct net_device * dev,uint32_t stringset,uint8_t * data)1090 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
1091 uint8_t *data)
1092 {
1093 if (stringset == ETH_SS_STATS)
1094 memcpy(data, batadv_counters_strings,
1095 sizeof(batadv_counters_strings));
1096 }
1097
batadv_get_ethtool_stats(struct net_device * dev,struct ethtool_stats * stats,uint64_t * data)1098 static void batadv_get_ethtool_stats(struct net_device *dev,
1099 struct ethtool_stats *stats,
1100 uint64_t *data)
1101 {
1102 struct batadv_priv *bat_priv = netdev_priv(dev);
1103 int i;
1104
1105 for (i = 0; i < BATADV_CNT_NUM; i++)
1106 data[i] = batadv_sum_counter(bat_priv, i);
1107 }
1108
batadv_get_sset_count(struct net_device * dev,int stringset)1109 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1110 {
1111 if (stringset == ETH_SS_STATS)
1112 return BATADV_CNT_NUM;
1113
1114 return -EOPNOTSUPP;
1115 }
1116