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TOMOYO Linux Cross Reference
Linux/net/batman-adv/soft-interface.c

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

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