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

Version: ~ [ linux-5.19-rc3 ] ~ [ linux-5.18.5 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.48 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.123 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.199 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.248 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.284 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.319 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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  1 /* Copyright (C) 2007-2016  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 "soft-interface.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/byteorder/generic.h>
 23 #include <linux/cache.h>
 24 #include <linux/compiler.h>
 25 #include <linux/errno.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/ethtool.h>
 28 #include <linux/fs.h>
 29 #include <linux/if_ether.h>
 30 #include <linux/if_vlan.h>
 31 #include <linux/jiffies.h>
 32 #include <linux/kernel.h>
 33 #include <linux/kref.h>
 34 #include <linux/list.h>
 35 #include <linux/lockdep.h>
 36 #include <linux/netdevice.h>
 37 #include <linux/percpu.h>
 38 #include <linux/printk.h>
 39 #include <linux/random.h>
 40 #include <linux/rculist.h>
 41 #include <linux/rcupdate.h>
 42 #include <linux/skbuff.h>
 43 #include <linux/slab.h>
 44 #include <linux/socket.h>
 45 #include <linux/spinlock.h>
 46 #include <linux/stddef.h>
 47 #include <linux/string.h>
 48 #include <linux/types.h>
 49 #include <linux/workqueue.h>
 50 
 51 #include "bat_algo.h"
 52 #include "bridge_loop_avoidance.h"
 53 #include "debugfs.h"
 54 #include "distributed-arp-table.h"
 55 #include "gateway_client.h"
 56 #include "gateway_common.h"
 57 #include "hard-interface.h"
 58 #include "multicast.h"
 59 #include "network-coding.h"
 60 #include "packet.h"
 61 #include "send.h"
 62 #include "sysfs.h"
 63 #include "translation-table.h"
 64 
 65 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
 66 static void batadv_get_drvinfo(struct net_device *dev,
 67                                struct ethtool_drvinfo *info);
 68 static u32 batadv_get_msglevel(struct net_device *dev);
 69 static void batadv_set_msglevel(struct net_device *dev, u32 value);
 70 static u32 batadv_get_link(struct net_device *dev);
 71 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
 72 static void batadv_get_ethtool_stats(struct net_device *dev,
 73                                      struct ethtool_stats *stats, u64 *data);
 74 static int batadv_get_sset_count(struct net_device *dev, int stringset);
 75 
 76 static const struct ethtool_ops batadv_ethtool_ops = {
 77         .get_settings = batadv_get_settings,
 78         .get_drvinfo = batadv_get_drvinfo,
 79         .get_msglevel = batadv_get_msglevel,
 80         .set_msglevel = batadv_set_msglevel,
 81         .get_link = batadv_get_link,
 82         .get_strings = batadv_get_strings,
 83         .get_ethtool_stats = batadv_get_ethtool_stats,
 84         .get_sset_count = batadv_get_sset_count,
 85 };
 86 
 87 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
 88 {
 89         int result;
 90 
 91         /* TODO: We must check if we can release all references to non-payload
 92          * data using skb_header_release in our skbs to allow skb_cow_header to
 93          * work optimally. This means that those skbs are not allowed to read
 94          * or write any data which is before the current position of skb->data
 95          * after that call and thus allow other skbs with the same data buffer
 96          * to write freely in that area.
 97          */
 98         result = skb_cow_head(skb, len);
 99         if (result < 0)
100                 return result;
101 
102         skb_push(skb, len);
103         return 0;
104 }
105 
106 static int batadv_interface_open(struct net_device *dev)
107 {
108         netif_start_queue(dev);
109         return 0;
110 }
111 
112 static int batadv_interface_release(struct net_device *dev)
113 {
114         netif_stop_queue(dev);
115         return 0;
116 }
117 
118 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
119 {
120         struct batadv_priv *bat_priv = netdev_priv(dev);
121         struct net_device_stats *stats = &bat_priv->stats;
122 
123         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
124         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
125         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
126         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
127         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
128         return stats;
129 }
130 
131 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
132 {
133         struct batadv_priv *bat_priv = netdev_priv(dev);
134         struct batadv_softif_vlan *vlan;
135         struct sockaddr *addr = p;
136         u8 old_addr[ETH_ALEN];
137 
138         if (!is_valid_ether_addr(addr->sa_data))
139                 return -EADDRNOTAVAIL;
140 
141         ether_addr_copy(old_addr, dev->dev_addr);
142         ether_addr_copy(dev->dev_addr, addr->sa_data);
143 
144         /* only modify transtable if it has been initialized before */
145         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
146                 return 0;
147 
148         rcu_read_lock();
149         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
150                 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
151                                        "mac address changed", false);
152                 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
153                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
154         }
155         rcu_read_unlock();
156 
157         return 0;
158 }
159 
160 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
161 {
162         /* check ranges */
163         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
164                 return -EINVAL;
165 
166         dev->mtu = new_mtu;
167 
168         return 0;
169 }
170 
171 /**
172  * batadv_interface_set_rx_mode - set the rx mode of a device
173  * @dev: registered network device to modify
174  *
175  * We do not actually need to set any rx filters for the virtual batman
176  * soft interface. However a dummy handler enables a user to set static
177  * multicast listeners for instance.
178  */
179 static void batadv_interface_set_rx_mode(struct net_device *dev)
180 {
181 }
182 
183 static int batadv_interface_tx(struct sk_buff *skb,
184                                struct net_device *soft_iface)
185 {
186         struct ethhdr *ethhdr;
187         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
188         struct batadv_hard_iface *primary_if = NULL;
189         struct batadv_bcast_packet *bcast_packet;
190         static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
191                                               0x00, 0x00};
192         static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
193                                                0x00, 0x00};
194         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
195         u8 *dst_hint = NULL, chaddr[ETH_ALEN];
196         struct vlan_ethhdr *vhdr;
197         unsigned int header_len = 0;
198         int data_len = skb->len, ret;
199         unsigned long brd_delay = 1;
200         bool do_bcast = false, client_added;
201         unsigned short vid;
202         u32 seqno;
203         int gw_mode;
204         enum batadv_forw_mode forw_mode;
205         struct batadv_orig_node *mcast_single_orig = NULL;
206         int network_offset = ETH_HLEN;
207 
208         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
209                 goto dropped;
210 
211         netif_trans_update(soft_iface);
212         vid = batadv_get_vid(skb, 0);
213         ethhdr = eth_hdr(skb);
214 
215         switch (ntohs(ethhdr->h_proto)) {
216         case ETH_P_8021Q:
217                 vhdr = vlan_eth_hdr(skb);
218 
219                 /* drop batman-in-batman packets to prevent loops */
220                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
221                         network_offset += VLAN_HLEN;
222                         break;
223                 }
224 
225                 /* fall through */
226         case ETH_P_BATMAN:
227                 goto dropped;
228         }
229 
230         skb_set_network_header(skb, network_offset);
231 
232         if (batadv_bla_tx(bat_priv, skb, vid))
233                 goto dropped;
234 
235         /* skb->data might have been reallocated by batadv_bla_tx() */
236         ethhdr = eth_hdr(skb);
237 
238         /* Register the client MAC in the transtable */
239         if (!is_multicast_ether_addr(ethhdr->h_source)) {
240                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
241                                                    vid, skb->skb_iif,
242                                                    skb->mark);
243                 if (!client_added)
244                         goto dropped;
245         }
246 
247         /* don't accept stp packets. STP does not help in meshes.
248          * better use the bridge loop avoidance ...
249          *
250          * The same goes for ECTP sent at least by some Cisco Switches,
251          * it might confuse the mesh when used with bridge loop avoidance.
252          */
253         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
254                 goto dropped;
255 
256         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
257                 goto dropped;
258 
259         gw_mode = atomic_read(&bat_priv->gw.mode);
260         if (is_multicast_ether_addr(ethhdr->h_dest)) {
261                 /* if gw mode is off, broadcast every packet */
262                 if (gw_mode == BATADV_GW_MODE_OFF) {
263                         do_bcast = true;
264                         goto send;
265                 }
266 
267                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
268                                                         chaddr);
269                 /* skb->data may have been modified by
270                  * batadv_gw_dhcp_recipient_get()
271                  */
272                 ethhdr = eth_hdr(skb);
273                 /* if gw_mode is on, broadcast any non-DHCP message.
274                  * All the DHCP packets are going to be sent as unicast
275                  */
276                 if (dhcp_rcp == BATADV_DHCP_NO) {
277                         do_bcast = true;
278                         goto send;
279                 }
280 
281                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
282                         dst_hint = chaddr;
283                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
284                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
285                         /* gateways should not forward any DHCP message if
286                          * directed to a DHCP server
287                          */
288                         goto dropped;
289 
290 send:
291                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
292                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
293                                                            &mcast_single_orig);
294                         if (forw_mode == BATADV_FORW_NONE)
295                                 goto dropped;
296 
297                         if (forw_mode == BATADV_FORW_SINGLE)
298                                 do_bcast = false;
299                 }
300         }
301 
302         batadv_skb_set_priority(skb, 0);
303 
304         /* ethernet packet should be broadcasted */
305         if (do_bcast) {
306                 primary_if = batadv_primary_if_get_selected(bat_priv);
307                 if (!primary_if)
308                         goto dropped;
309 
310                 /* in case of ARP request, we do not immediately broadcasti the
311                  * packet, instead we first wait for DAT to try to retrieve the
312                  * correct ARP entry
313                  */
314                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
315                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
316 
317                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
318                         goto dropped;
319 
320                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
321                 bcast_packet->version = BATADV_COMPAT_VERSION;
322                 bcast_packet->ttl = BATADV_TTL;
323 
324                 /* batman packet type: broadcast */
325                 bcast_packet->packet_type = BATADV_BCAST;
326                 bcast_packet->reserved = 0;
327 
328                 /* hw address of first interface is the orig mac because only
329                  * this mac is known throughout the mesh
330                  */
331                 ether_addr_copy(bcast_packet->orig,
332                                 primary_if->net_dev->dev_addr);
333 
334                 /* set broadcast sequence number */
335                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
336                 bcast_packet->seqno = htonl(seqno);
337 
338                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay);
339 
340                 /* a copy is stored in the bcast list, therefore removing
341                  * the original skb.
342                  */
343                 kfree_skb(skb);
344 
345         /* unicast packet */
346         } else {
347                 /* DHCP packets going to a server will use the GW feature */
348                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
349                         ret = batadv_gw_out_of_range(bat_priv, skb);
350                         if (ret)
351                                 goto dropped;
352                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
353                 } else if (mcast_single_orig) {
354                         ret = batadv_send_skb_unicast(bat_priv, skb,
355                                                       BATADV_UNICAST, 0,
356                                                       mcast_single_orig, vid);
357                 } else {
358                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
359                                                                   skb))
360                                 goto dropped;
361 
362                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
363 
364                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
365                                                      vid);
366                 }
367                 if (ret == NET_XMIT_DROP)
368                         goto dropped_freed;
369         }
370 
371         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
372         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
373         goto end;
374 
375 dropped:
376         kfree_skb(skb);
377 dropped_freed:
378         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
379 end:
380         if (primary_if)
381                 batadv_hardif_put(primary_if);
382         return NETDEV_TX_OK;
383 }
384 
385 /**
386  * batadv_interface_rx - receive ethernet frame on local batman-adv interface
387  * @soft_iface: local interface which will receive the ethernet frame
388  * @skb: ethernet frame for @soft_iface
389  * @hdr_size: size of already parsed batman-adv header
390  * @orig_node: originator from which the batman-adv packet was sent
391  *
392  * Sends a ethernet frame to the receive path of the local @soft_iface.
393  * skb->data has still point to the batman-adv header with the size @hdr_size.
394  * The caller has to have parsed this header already and made sure that at least
395  * @hdr_size bytes are still available for pull in @skb.
396  *
397  * The packet may still get dropped. This can happen when the encapsulated
398  * ethernet frame is invalid or contains again an batman-adv packet. Also
399  * unicast packets will be dropped directly when it was sent between two
400  * isolated clients.
401  */
402 void batadv_interface_rx(struct net_device *soft_iface,
403                          struct sk_buff *skb, int hdr_size,
404                          struct batadv_orig_node *orig_node)
405 {
406         struct batadv_bcast_packet *batadv_bcast_packet;
407         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
408         struct vlan_ethhdr *vhdr;
409         struct ethhdr *ethhdr;
410         unsigned short vid;
411         bool is_bcast;
412 
413         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
414         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
415 
416         skb_pull_rcsum(skb, hdr_size);
417         skb_reset_mac_header(skb);
418 
419         /* clean the netfilter state now that the batman-adv header has been
420          * removed
421          */
422         nf_reset(skb);
423 
424         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
425                 goto dropped;
426 
427         vid = batadv_get_vid(skb, 0);
428         ethhdr = eth_hdr(skb);
429 
430         switch (ntohs(ethhdr->h_proto)) {
431         case ETH_P_8021Q:
432                 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
433                         goto dropped;
434 
435                 vhdr = (struct vlan_ethhdr *)skb->data;
436 
437                 /* drop batman-in-batman packets to prevent loops */
438                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
439                         break;
440 
441                 /* fall through */
442         case ETH_P_BATMAN:
443                 goto dropped;
444         }
445 
446         /* skb->dev & skb->pkt_type are set here */
447         skb->protocol = eth_type_trans(skb, soft_iface);
448 
449         /* should not be necessary anymore as we use skb_pull_rcsum()
450          * TODO: please verify this and remove this TODO
451          * -- Dec 21st 2009, Simon Wunderlich
452          */
453 
454         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
455 
456         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
457         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
458                            skb->len + ETH_HLEN);
459 
460         soft_iface->last_rx = jiffies;
461 
462         /* Let the bridge loop avoidance check the packet. If will
463          * not handle it, we can safely push it up.
464          */
465         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
466                 goto out;
467 
468         if (orig_node)
469                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
470                                                      ethhdr->h_source, vid);
471 
472         if (is_multicast_ether_addr(ethhdr->h_dest)) {
473                 /* set the mark on broadcast packets if AP isolation is ON and
474                  * the packet is coming from an "isolated" client
475                  */
476                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
477                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
478                                                  vid)) {
479                         /* save bits in skb->mark not covered by the mask and
480                          * apply the mark on the rest
481                          */
482                         skb->mark &= ~bat_priv->isolation_mark_mask;
483                         skb->mark |= bat_priv->isolation_mark;
484                 }
485         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
486                                          ethhdr->h_dest, vid)) {
487                 goto dropped;
488         }
489 
490         netif_rx(skb);
491         goto out;
492 
493 dropped:
494         kfree_skb(skb);
495 out:
496         return;
497 }
498 
499 /**
500  * batadv_softif_vlan_release - release vlan from lists and queue for free after
501  *  rcu grace period
502  * @ref: kref pointer of the vlan object
503  */
504 static void batadv_softif_vlan_release(struct kref *ref)
505 {
506         struct batadv_softif_vlan *vlan;
507 
508         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
509 
510         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
511         hlist_del_rcu(&vlan->list);
512         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
513 
514         kfree_rcu(vlan, rcu);
515 }
516 
517 /**
518  * batadv_softif_vlan_put - decrease the vlan object refcounter and
519  *  possibly release it
520  * @vlan: the vlan object to release
521  */
522 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
523 {
524         if (!vlan)
525                 return;
526 
527         kref_put(&vlan->refcount, batadv_softif_vlan_release);
528 }
529 
530 /**
531  * batadv_softif_vlan_get - get the vlan object for a specific vid
532  * @bat_priv: the bat priv with all the soft interface information
533  * @vid: the identifier of the vlan object to retrieve
534  *
535  * Return: the private data of the vlan matching the vid passed as argument or
536  * NULL otherwise. The refcounter of the returned object is incremented by 1.
537  */
538 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
539                                                   unsigned short vid)
540 {
541         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
542 
543         rcu_read_lock();
544         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
545                 if (vlan_tmp->vid != vid)
546                         continue;
547 
548                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
549                         continue;
550 
551                 vlan = vlan_tmp;
552                 break;
553         }
554         rcu_read_unlock();
555 
556         return vlan;
557 }
558 
559 /**
560  * batadv_softif_create_vlan - allocate the needed resources for a new vlan
561  * @bat_priv: the bat priv with all the soft interface information
562  * @vid: the VLAN identifier
563  *
564  * Return: 0 on success, a negative error otherwise.
565  */
566 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
567 {
568         struct batadv_softif_vlan *vlan;
569         int err;
570 
571         vlan = batadv_softif_vlan_get(bat_priv, vid);
572         if (vlan) {
573                 batadv_softif_vlan_put(vlan);
574                 return -EEXIST;
575         }
576 
577         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
578         if (!vlan)
579                 return -ENOMEM;
580 
581         vlan->bat_priv = bat_priv;
582         vlan->vid = vid;
583         kref_init(&vlan->refcount);
584 
585         atomic_set(&vlan->ap_isolation, 0);
586 
587         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
588         if (err) {
589                 kfree(vlan);
590                 return err;
591         }
592 
593         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
594         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
595         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
596 
597         /* add a new TT local entry. This one will be marked with the NOPURGE
598          * flag
599          */
600         batadv_tt_local_add(bat_priv->soft_iface,
601                             bat_priv->soft_iface->dev_addr, vid,
602                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
603 
604         return 0;
605 }
606 
607 /**
608  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
609  * @bat_priv: the bat priv with all the soft interface information
610  * @vlan: the object to remove
611  */
612 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
613                                        struct batadv_softif_vlan *vlan)
614 {
615         /* explicitly remove the associated TT local entry because it is marked
616          * with the NOPURGE flag
617          */
618         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
619                                vlan->vid, "vlan interface destroyed", false);
620 
621         batadv_sysfs_del_vlan(bat_priv, vlan);
622         batadv_softif_vlan_put(vlan);
623 }
624 
625 /**
626  * batadv_interface_add_vid - ndo_add_vid API implementation
627  * @dev: the netdev of the mesh interface
628  * @proto: protocol of the the vlan id
629  * @vid: identifier of the new vlan
630  *
631  * Set up all the internal structures for handling the new vlan on top of the
632  * mesh interface
633  *
634  * Return: 0 on success or a negative error code in case of failure.
635  */
636 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
637                                     unsigned short vid)
638 {
639         struct batadv_priv *bat_priv = netdev_priv(dev);
640         struct batadv_softif_vlan *vlan;
641         int ret;
642 
643         /* only 802.1Q vlans are supported.
644          * batman-adv does not know how to handle other types
645          */
646         if (proto != htons(ETH_P_8021Q))
647                 return -EINVAL;
648 
649         vid |= BATADV_VLAN_HAS_TAG;
650 
651         /* if a new vlan is getting created and it already exists, it means that
652          * it was not deleted yet. batadv_softif_vlan_get() increases the
653          * refcount in order to revive the object.
654          *
655          * if it does not exist then create it.
656          */
657         vlan = batadv_softif_vlan_get(bat_priv, vid);
658         if (!vlan)
659                 return batadv_softif_create_vlan(bat_priv, vid);
660 
661         /* recreate the sysfs object if it was already destroyed (and it should
662          * be since we received a kill_vid() for this vlan
663          */
664         if (!vlan->kobj) {
665                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
666                 if (ret) {
667                         batadv_softif_vlan_put(vlan);
668                         return ret;
669                 }
670         }
671 
672         /* add a new TT local entry. This one will be marked with the NOPURGE
673          * flag. This must be added again, even if the vlan object already
674          * exists, because the entry was deleted by kill_vid()
675          */
676         batadv_tt_local_add(bat_priv->soft_iface,
677                             bat_priv->soft_iface->dev_addr, vid,
678                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
679 
680         return 0;
681 }
682 
683 /**
684  * batadv_interface_kill_vid - ndo_kill_vid API implementation
685  * @dev: the netdev of the mesh interface
686  * @proto: protocol of the the vlan id
687  * @vid: identifier of the deleted vlan
688  *
689  * Destroy all the internal structures used to handle the vlan identified by vid
690  * on top of the mesh interface
691  *
692  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
693  * or -ENOENT if the specified vlan id wasn't registered.
694  */
695 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
696                                      unsigned short vid)
697 {
698         struct batadv_priv *bat_priv = netdev_priv(dev);
699         struct batadv_softif_vlan *vlan;
700 
701         /* only 802.1Q vlans are supported. batman-adv does not know how to
702          * handle other types
703          */
704         if (proto != htons(ETH_P_8021Q))
705                 return -EINVAL;
706 
707         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
708         if (!vlan)
709                 return -ENOENT;
710 
711         batadv_softif_destroy_vlan(bat_priv, vlan);
712 
713         /* finally free the vlan object */
714         batadv_softif_vlan_put(vlan);
715 
716         return 0;
717 }
718 
719 /* batman-adv network devices have devices nesting below it and are a special
720  * "super class" of normal network devices; split their locks off into a
721  * separate class since they always nest.
722  */
723 static struct lock_class_key batadv_netdev_xmit_lock_key;
724 static struct lock_class_key batadv_netdev_addr_lock_key;
725 
726 /**
727  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
728  * @dev: device which owns the tx queue
729  * @txq: tx queue to modify
730  * @_unused: always NULL
731  */
732 static void batadv_set_lockdep_class_one(struct net_device *dev,
733                                          struct netdev_queue *txq,
734                                          void *_unused)
735 {
736         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
737 }
738 
739 /**
740  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
741  * @dev: network device to modify
742  */
743 static void batadv_set_lockdep_class(struct net_device *dev)
744 {
745         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
746         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
747 }
748 
749 /**
750  * batadv_softif_destroy_finish - cleans up the remains of a softif
751  * @work: work queue item
752  *
753  * Free the parts of the soft interface which can not be removed under
754  * rtnl lock (to prevent deadlock situations).
755  */
756 static void batadv_softif_destroy_finish(struct work_struct *work)
757 {
758         struct batadv_softif_vlan *vlan;
759         struct batadv_priv *bat_priv;
760         struct net_device *soft_iface;
761 
762         bat_priv = container_of(work, struct batadv_priv,
763                                 cleanup_work);
764         soft_iface = bat_priv->soft_iface;
765 
766         /* destroy the "untagged" VLAN */
767         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
768         if (vlan) {
769                 batadv_softif_destroy_vlan(bat_priv, vlan);
770                 batadv_softif_vlan_put(vlan);
771         }
772 
773         batadv_sysfs_del_meshif(soft_iface);
774         unregister_netdev(soft_iface);
775 }
776 
777 /**
778  * batadv_softif_init_late - late stage initialization of soft interface
779  * @dev: registered network device to modify
780  *
781  * Return: error code on failures
782  */
783 static int batadv_softif_init_late(struct net_device *dev)
784 {
785         struct batadv_priv *bat_priv;
786         u32 random_seqno;
787         int ret;
788         size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
789 
790         batadv_set_lockdep_class(dev);
791 
792         bat_priv = netdev_priv(dev);
793         bat_priv->soft_iface = dev;
794         INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
795 
796         /* batadv_interface_stats() needs to be available as soon as
797          * register_netdevice() has been called
798          */
799         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
800         if (!bat_priv->bat_counters)
801                 return -ENOMEM;
802 
803         atomic_set(&bat_priv->aggregated_ogms, 1);
804         atomic_set(&bat_priv->bonding, 0);
805 #ifdef CONFIG_BATMAN_ADV_BLA
806         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
807 #endif
808 #ifdef CONFIG_BATMAN_ADV_DAT
809         atomic_set(&bat_priv->distributed_arp_table, 1);
810 #endif
811 #ifdef CONFIG_BATMAN_ADV_MCAST
812         bat_priv->mcast.querier_ipv4.exists = false;
813         bat_priv->mcast.querier_ipv4.shadowing = false;
814         bat_priv->mcast.querier_ipv6.exists = false;
815         bat_priv->mcast.querier_ipv6.shadowing = false;
816         bat_priv->mcast.flags = BATADV_NO_FLAGS;
817         atomic_set(&bat_priv->multicast_mode, 1);
818         atomic_set(&bat_priv->mcast.num_disabled, 0);
819         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
820         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
821         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
822 #endif
823         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
824         atomic_set(&bat_priv->gw.sel_class, 20);
825         atomic_set(&bat_priv->gw.bandwidth_down, 100);
826         atomic_set(&bat_priv->gw.bandwidth_up, 20);
827         atomic_set(&bat_priv->orig_interval, 1000);
828         atomic_set(&bat_priv->hop_penalty, 30);
829 #ifdef CONFIG_BATMAN_ADV_DEBUG
830         atomic_set(&bat_priv->log_level, 0);
831 #endif
832         atomic_set(&bat_priv->fragmentation, 1);
833         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
834         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
835         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
836 
837         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
838         atomic_set(&bat_priv->bcast_seqno, 1);
839         atomic_set(&bat_priv->tt.vn, 0);
840         atomic_set(&bat_priv->tt.local_changes, 0);
841         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
842 #ifdef CONFIG_BATMAN_ADV_BLA
843         atomic_set(&bat_priv->bla.num_requests, 0);
844 #endif
845         atomic_set(&bat_priv->tp_num, 0);
846 
847         bat_priv->tt.last_changeset = NULL;
848         bat_priv->tt.last_changeset_len = 0;
849         bat_priv->isolation_mark = 0;
850         bat_priv->isolation_mark_mask = 0;
851 
852         /* randomize initial seqno to avoid collision */
853         get_random_bytes(&random_seqno, sizeof(random_seqno));
854         atomic_set(&bat_priv->frag_seqno, random_seqno);
855 
856         bat_priv->primary_if = NULL;
857         bat_priv->num_ifaces = 0;
858 
859         batadv_nc_init_bat_priv(bat_priv);
860 
861         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
862         if (ret < 0)
863                 goto free_bat_counters;
864 
865         ret = batadv_debugfs_add_meshif(dev);
866         if (ret < 0)
867                 goto free_bat_counters;
868 
869         ret = batadv_mesh_init(dev);
870         if (ret < 0)
871                 goto unreg_debugfs;
872 
873         return 0;
874 
875 unreg_debugfs:
876         batadv_debugfs_del_meshif(dev);
877 free_bat_counters:
878         free_percpu(bat_priv->bat_counters);
879         bat_priv->bat_counters = NULL;
880 
881         return ret;
882 }
883 
884 /**
885  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
886  * @dev: batadv_soft_interface used as master interface
887  * @slave_dev: net_device which should become the slave interface
888  *
889  * Return: 0 if successful or error otherwise.
890  */
891 static int batadv_softif_slave_add(struct net_device *dev,
892                                    struct net_device *slave_dev)
893 {
894         struct batadv_hard_iface *hard_iface;
895         struct net *net = dev_net(dev);
896         int ret = -EINVAL;
897 
898         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
899         if (!hard_iface || hard_iface->soft_iface)
900                 goto out;
901 
902         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
903 
904 out:
905         if (hard_iface)
906                 batadv_hardif_put(hard_iface);
907         return ret;
908 }
909 
910 /**
911  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
912  * @dev: batadv_soft_interface used as master interface
913  * @slave_dev: net_device which should be removed from the master interface
914  *
915  * Return: 0 if successful or error otherwise.
916  */
917 static int batadv_softif_slave_del(struct net_device *dev,
918                                    struct net_device *slave_dev)
919 {
920         struct batadv_hard_iface *hard_iface;
921         int ret = -EINVAL;
922 
923         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
924 
925         if (!hard_iface || hard_iface->soft_iface != dev)
926                 goto out;
927 
928         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
929         ret = 0;
930 
931 out:
932         if (hard_iface)
933                 batadv_hardif_put(hard_iface);
934         return ret;
935 }
936 
937 static const struct net_device_ops batadv_netdev_ops = {
938         .ndo_init = batadv_softif_init_late,
939         .ndo_open = batadv_interface_open,
940         .ndo_stop = batadv_interface_release,
941         .ndo_get_stats = batadv_interface_stats,
942         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
943         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
944         .ndo_set_mac_address = batadv_interface_set_mac_addr,
945         .ndo_change_mtu = batadv_interface_change_mtu,
946         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
947         .ndo_start_xmit = batadv_interface_tx,
948         .ndo_validate_addr = eth_validate_addr,
949         .ndo_add_slave = batadv_softif_slave_add,
950         .ndo_del_slave = batadv_softif_slave_del,
951 };
952 
953 /**
954  * batadv_softif_free - Deconstructor of batadv_soft_interface
955  * @dev: Device to cleanup and remove
956  */
957 static void batadv_softif_free(struct net_device *dev)
958 {
959         batadv_debugfs_del_meshif(dev);
960         batadv_mesh_free(dev);
961 
962         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
963          * their tasks. Wait for them all to be finished before freeing the
964          * netdev and its private data (bat_priv)
965          */
966         rcu_barrier();
967 
968         free_netdev(dev);
969 }
970 
971 /**
972  * batadv_softif_init_early - early stage initialization of soft interface
973  * @dev: registered network device to modify
974  */
975 static void batadv_softif_init_early(struct net_device *dev)
976 {
977         struct batadv_priv *priv = netdev_priv(dev);
978 
979         ether_setup(dev);
980 
981         dev->netdev_ops = &batadv_netdev_ops;
982         dev->destructor = batadv_softif_free;
983         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
984         dev->priv_flags |= IFF_NO_QUEUE;
985 
986         /* can't call min_mtu, because the needed variables
987          * have not been initialized yet
988          */
989         dev->mtu = ETH_DATA_LEN;
990 
991         /* generate random address */
992         eth_hw_addr_random(dev);
993 
994         dev->ethtool_ops = &batadv_ethtool_ops;
995 
996         memset(priv, 0, sizeof(*priv));
997 }
998 
999 struct net_device *batadv_softif_create(struct net *net, const char *name)
1000 {
1001         struct net_device *soft_iface;
1002         int ret;
1003 
1004         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1005                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1006         if (!soft_iface)
1007                 return NULL;
1008 
1009         dev_net_set(soft_iface, net);
1010 
1011         soft_iface->rtnl_link_ops = &batadv_link_ops;
1012 
1013         ret = register_netdevice(soft_iface);
1014         if (ret < 0) {
1015                 pr_err("Unable to register the batman interface '%s': %i\n",
1016                        name, ret);
1017                 free_netdev(soft_iface);
1018                 return NULL;
1019         }
1020 
1021         return soft_iface;
1022 }
1023 
1024 /**
1025  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
1026  * @soft_iface: the to-be-removed batman-adv interface
1027  */
1028 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1029 {
1030         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1031 
1032         queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
1033 }
1034 
1035 /**
1036  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
1037  * @soft_iface: the to-be-removed batman-adv interface
1038  * @head: list pointer
1039  */
1040 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1041                                           struct list_head *head)
1042 {
1043         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1044         struct batadv_hard_iface *hard_iface;
1045         struct batadv_softif_vlan *vlan;
1046 
1047         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1048                 if (hard_iface->soft_iface == soft_iface)
1049                         batadv_hardif_disable_interface(hard_iface,
1050                                                         BATADV_IF_CLEANUP_KEEP);
1051         }
1052 
1053         /* destroy the "untagged" VLAN */
1054         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1055         if (vlan) {
1056                 batadv_softif_destroy_vlan(bat_priv, vlan);
1057                 batadv_softif_vlan_put(vlan);
1058         }
1059 
1060         batadv_sysfs_del_meshif(soft_iface);
1061         unregister_netdevice_queue(soft_iface, head);
1062 }
1063 
1064 bool batadv_softif_is_valid(const struct net_device *net_dev)
1065 {
1066         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1067                 return true;
1068 
1069         return false;
1070 }
1071 
1072 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1073         .kind           = "batadv",
1074         .priv_size      = sizeof(struct batadv_priv),
1075         .setup          = batadv_softif_init_early,
1076         .dellink        = batadv_softif_destroy_netlink,
1077 };
1078 
1079 /* ethtool */
1080 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1081 {
1082         cmd->supported = 0;
1083         cmd->advertising = 0;
1084         ethtool_cmd_speed_set(cmd, SPEED_10);
1085         cmd->duplex = DUPLEX_FULL;
1086         cmd->port = PORT_TP;
1087         cmd->phy_address = 0;
1088         cmd->transceiver = XCVR_INTERNAL;
1089         cmd->autoneg = AUTONEG_DISABLE;
1090         cmd->maxtxpkt = 0;
1091         cmd->maxrxpkt = 0;
1092 
1093         return 0;
1094 }
1095 
1096 static void batadv_get_drvinfo(struct net_device *dev,
1097                                struct ethtool_drvinfo *info)
1098 {
1099         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1100         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1101         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1102         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1103 }
1104 
1105 static u32 batadv_get_msglevel(struct net_device *dev)
1106 {
1107         return -EOPNOTSUPP;
1108 }
1109 
1110 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1111 {
1112 }
1113 
1114 static u32 batadv_get_link(struct net_device *dev)
1115 {
1116         return 1;
1117 }
1118 
1119 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1120  * Declare each description string in struct.name[] to get fixed sized buffer
1121  * and compile time checking for strings longer than ETH_GSTRING_LEN.
1122  */
1123 static const struct {
1124         const char name[ETH_GSTRING_LEN];
1125 } batadv_counters_strings[] = {
1126         { "tx" },
1127         { "tx_bytes" },
1128         { "tx_dropped" },
1129         { "rx" },
1130         { "rx_bytes" },
1131         { "forward" },
1132         { "forward_bytes" },
1133         { "mgmt_tx" },
1134         { "mgmt_tx_bytes" },
1135         { "mgmt_rx" },
1136         { "mgmt_rx_bytes" },
1137         { "frag_tx" },
1138         { "frag_tx_bytes" },
1139         { "frag_rx" },
1140         { "frag_rx_bytes" },
1141         { "frag_fwd" },
1142         { "frag_fwd_bytes" },
1143         { "tt_request_tx" },
1144         { "tt_request_rx" },
1145         { "tt_response_tx" },
1146         { "tt_response_rx" },
1147         { "tt_roam_adv_tx" },
1148         { "tt_roam_adv_rx" },
1149 #ifdef CONFIG_BATMAN_ADV_DAT
1150         { "dat_get_tx" },
1151         { "dat_get_rx" },
1152         { "dat_put_tx" },
1153         { "dat_put_rx" },
1154         { "dat_cached_reply_tx" },
1155 #endif
1156 #ifdef CONFIG_BATMAN_ADV_NC
1157         { "nc_code" },
1158         { "nc_code_bytes" },
1159         { "nc_recode" },
1160         { "nc_recode_bytes" },
1161         { "nc_buffer" },
1162         { "nc_decode" },
1163         { "nc_decode_bytes" },
1164         { "nc_decode_failed" },
1165         { "nc_sniffed" },
1166 #endif
1167 };
1168 
1169 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1170 {
1171         if (stringset == ETH_SS_STATS)
1172                 memcpy(data, batadv_counters_strings,
1173                        sizeof(batadv_counters_strings));
1174 }
1175 
1176 static void batadv_get_ethtool_stats(struct net_device *dev,
1177                                      struct ethtool_stats *stats, u64 *data)
1178 {
1179         struct batadv_priv *bat_priv = netdev_priv(dev);
1180         int i;
1181 
1182         for (i = 0; i < BATADV_CNT_NUM; i++)
1183                 data[i] = batadv_sum_counter(bat_priv, i);
1184 }
1185 
1186 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1187 {
1188         if (stringset == ETH_SS_STATS)
1189                 return BATADV_CNT_NUM;
1190 
1191         return -EOPNOTSUPP;
1192 }
1193 

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