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

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ 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/cpumask.h>
 26 #include <linux/errno.h>
 27 #include <linux/etherdevice.h>
 28 #include <linux/ethtool.h>
 29 #include <linux/fs.h>
 30 #include <linux/if_ether.h>
 31 #include <linux/if_vlan.h>
 32 #include <linux/jiffies.h>
 33 #include <linux/kernel.h>
 34 #include <linux/kref.h>
 35 #include <linux/list.h>
 36 #include <linux/lockdep.h>
 37 #include <linux/netdevice.h>
 38 #include <linux/percpu.h>
 39 #include <linux/printk.h>
 40 #include <linux/random.h>
 41 #include <linux/rculist.h>
 42 #include <linux/rcupdate.h>
 43 #include <linux/rtnetlink.h>
 44 #include <linux/skbuff.h>
 45 #include <linux/slab.h>
 46 #include <linux/socket.h>
 47 #include <linux/spinlock.h>
 48 #include <linux/stddef.h>
 49 #include <linux/string.h>
 50 #include <linux/types.h>
 51 
 52 #include "bat_algo.h"
 53 #include "bridge_loop_avoidance.h"
 54 #include "debugfs.h"
 55 #include "distributed-arp-table.h"
 56 #include "gateway_client.h"
 57 #include "gateway_common.h"
 58 #include "hard-interface.h"
 59 #include "multicast.h"
 60 #include "network-coding.h"
 61 #include "originator.h"
 62 #include "packet.h"
 63 #include "send.h"
 64 #include "sysfs.h"
 65 #include "translation-table.h"
 66 
 67 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
 68 static void batadv_get_drvinfo(struct net_device *dev,
 69                                struct ethtool_drvinfo *info);
 70 static u32 batadv_get_msglevel(struct net_device *dev);
 71 static void batadv_set_msglevel(struct net_device *dev, u32 value);
 72 static u32 batadv_get_link(struct net_device *dev);
 73 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data);
 74 static void batadv_get_ethtool_stats(struct net_device *dev,
 75                                      struct ethtool_stats *stats, u64 *data);
 76 static int batadv_get_sset_count(struct net_device *dev, int stringset);
 77 
 78 static const struct ethtool_ops batadv_ethtool_ops = {
 79         .get_settings = batadv_get_settings,
 80         .get_drvinfo = batadv_get_drvinfo,
 81         .get_msglevel = batadv_get_msglevel,
 82         .set_msglevel = batadv_set_msglevel,
 83         .get_link = batadv_get_link,
 84         .get_strings = batadv_get_strings,
 85         .get_ethtool_stats = batadv_get_ethtool_stats,
 86         .get_sset_count = batadv_get_sset_count,
 87 };
 88 
 89 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
 90 {
 91         int result;
 92 
 93         /* TODO: We must check if we can release all references to non-payload
 94          * data using skb_header_release in our skbs to allow skb_cow_header to
 95          * work optimally. This means that those skbs are not allowed to read
 96          * or write any data which is before the current position of skb->data
 97          * after that call and thus allow other skbs with the same data buffer
 98          * to write freely in that area.
 99          */
100         result = skb_cow_head(skb, len);
101         if (result < 0)
102                 return result;
103 
104         skb_push(skb, len);
105         return 0;
106 }
107 
108 static int batadv_interface_open(struct net_device *dev)
109 {
110         netif_start_queue(dev);
111         return 0;
112 }
113 
114 static int batadv_interface_release(struct net_device *dev)
115 {
116         netif_stop_queue(dev);
117         return 0;
118 }
119 
120 /**
121  * batadv_sum_counter - Sum the cpu-local counters for index 'idx'
122  * @bat_priv: the bat priv with all the soft interface information
123  * @idx: index of counter to sum up
124  *
125  * Return: sum of all cpu-local counters
126  */
127 static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
128 {
129         u64 *counters, sum = 0;
130         int cpu;
131 
132         for_each_possible_cpu(cpu) {
133                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
134                 sum += counters[idx];
135         }
136 
137         return sum;
138 }
139 
140 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
141 {
142         struct batadv_priv *bat_priv = netdev_priv(dev);
143         struct net_device_stats *stats = &bat_priv->stats;
144 
145         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
146         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
147         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
148         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
149         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
150         return stats;
151 }
152 
153 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
154 {
155         struct batadv_priv *bat_priv = netdev_priv(dev);
156         struct batadv_softif_vlan *vlan;
157         struct sockaddr *addr = p;
158         u8 old_addr[ETH_ALEN];
159 
160         if (!is_valid_ether_addr(addr->sa_data))
161                 return -EADDRNOTAVAIL;
162 
163         ether_addr_copy(old_addr, dev->dev_addr);
164         ether_addr_copy(dev->dev_addr, addr->sa_data);
165 
166         /* only modify transtable if it has been initialized before */
167         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
168                 return 0;
169 
170         rcu_read_lock();
171         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
172                 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
173                                        "mac address changed", false);
174                 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
175                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
176         }
177         rcu_read_unlock();
178 
179         return 0;
180 }
181 
182 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
183 {
184         /* check ranges */
185         if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
186                 return -EINVAL;
187 
188         dev->mtu = new_mtu;
189 
190         return 0;
191 }
192 
193 /**
194  * batadv_interface_set_rx_mode - set the rx mode of a device
195  * @dev: registered network device to modify
196  *
197  * We do not actually need to set any rx filters for the virtual batman
198  * soft interface. However a dummy handler enables a user to set static
199  * multicast listeners for instance.
200  */
201 static void batadv_interface_set_rx_mode(struct net_device *dev)
202 {
203 }
204 
205 static int batadv_interface_tx(struct sk_buff *skb,
206                                struct net_device *soft_iface)
207 {
208         struct ethhdr *ethhdr;
209         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
210         struct batadv_hard_iface *primary_if = NULL;
211         struct batadv_bcast_packet *bcast_packet;
212         static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
213                                               0x00, 0x00};
214         static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
215                                                0x00, 0x00};
216         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
217         u8 *dst_hint = NULL, chaddr[ETH_ALEN];
218         struct vlan_ethhdr *vhdr;
219         unsigned int header_len = 0;
220         int data_len = skb->len, ret;
221         unsigned long brd_delay = 1;
222         bool do_bcast = false, client_added;
223         unsigned short vid;
224         u32 seqno;
225         int gw_mode;
226         enum batadv_forw_mode forw_mode;
227         struct batadv_orig_node *mcast_single_orig = NULL;
228         int network_offset = ETH_HLEN;
229 
230         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
231                 goto dropped;
232 
233         netif_trans_update(soft_iface);
234         vid = batadv_get_vid(skb, 0);
235         ethhdr = eth_hdr(skb);
236 
237         switch (ntohs(ethhdr->h_proto)) {
238         case ETH_P_8021Q:
239                 vhdr = vlan_eth_hdr(skb);
240 
241                 /* drop batman-in-batman packets to prevent loops */
242                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
243                         network_offset += VLAN_HLEN;
244                         break;
245                 }
246 
247                 /* fall through */
248         case ETH_P_BATMAN:
249                 goto dropped;
250         }
251 
252         skb_set_network_header(skb, network_offset);
253 
254         if (batadv_bla_tx(bat_priv, skb, vid))
255                 goto dropped;
256 
257         /* skb->data might have been reallocated by batadv_bla_tx() */
258         ethhdr = eth_hdr(skb);
259 
260         /* Register the client MAC in the transtable */
261         if (!is_multicast_ether_addr(ethhdr->h_source)) {
262                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
263                                                    vid, skb->skb_iif,
264                                                    skb->mark);
265                 if (!client_added)
266                         goto dropped;
267         }
268 
269         /* don't accept stp packets. STP does not help in meshes.
270          * better use the bridge loop avoidance ...
271          *
272          * The same goes for ECTP sent at least by some Cisco Switches,
273          * it might confuse the mesh when used with bridge loop avoidance.
274          */
275         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
276                 goto dropped;
277 
278         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
279                 goto dropped;
280 
281         gw_mode = atomic_read(&bat_priv->gw.mode);
282         if (is_multicast_ether_addr(ethhdr->h_dest)) {
283                 /* if gw mode is off, broadcast every packet */
284                 if (gw_mode == BATADV_GW_MODE_OFF) {
285                         do_bcast = true;
286                         goto send;
287                 }
288 
289                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
290                                                         chaddr);
291                 /* skb->data may have been modified by
292                  * batadv_gw_dhcp_recipient_get()
293                  */
294                 ethhdr = eth_hdr(skb);
295                 /* if gw_mode is on, broadcast any non-DHCP message.
296                  * All the DHCP packets are going to be sent as unicast
297                  */
298                 if (dhcp_rcp == BATADV_DHCP_NO) {
299                         do_bcast = true;
300                         goto send;
301                 }
302 
303                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
304                         dst_hint = chaddr;
305                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
306                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
307                         /* gateways should not forward any DHCP message if
308                          * directed to a DHCP server
309                          */
310                         goto dropped;
311 
312 send:
313                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
314                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
315                                                            &mcast_single_orig);
316                         if (forw_mode == BATADV_FORW_NONE)
317                                 goto dropped;
318 
319                         if (forw_mode == BATADV_FORW_SINGLE)
320                                 do_bcast = false;
321                 }
322         }
323 
324         batadv_skb_set_priority(skb, 0);
325 
326         /* ethernet packet should be broadcasted */
327         if (do_bcast) {
328                 primary_if = batadv_primary_if_get_selected(bat_priv);
329                 if (!primary_if)
330                         goto dropped;
331 
332                 /* in case of ARP request, we do not immediately broadcasti the
333                  * packet, instead we first wait for DAT to try to retrieve the
334                  * correct ARP entry
335                  */
336                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
337                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
338 
339                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
340                         goto dropped;
341 
342                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
343                 bcast_packet->version = BATADV_COMPAT_VERSION;
344                 bcast_packet->ttl = BATADV_TTL;
345 
346                 /* batman packet type: broadcast */
347                 bcast_packet->packet_type = BATADV_BCAST;
348                 bcast_packet->reserved = 0;
349 
350                 /* hw address of first interface is the orig mac because only
351                  * this mac is known throughout the mesh
352                  */
353                 ether_addr_copy(bcast_packet->orig,
354                                 primary_if->net_dev->dev_addr);
355 
356                 /* set broadcast sequence number */
357                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
358                 bcast_packet->seqno = htonl(seqno);
359 
360                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
361 
362                 /* a copy is stored in the bcast list, therefore removing
363                  * the original skb.
364                  */
365                 consume_skb(skb);
366 
367         /* unicast packet */
368         } else {
369                 /* DHCP packets going to a server will use the GW feature */
370                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
371                         ret = batadv_gw_out_of_range(bat_priv, skb);
372                         if (ret)
373                                 goto dropped;
374                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
375                 } else if (mcast_single_orig) {
376                         ret = batadv_send_skb_unicast(bat_priv, skb,
377                                                       BATADV_UNICAST, 0,
378                                                       mcast_single_orig, vid);
379                 } else {
380                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
381                                                                   skb))
382                                 goto dropped;
383 
384                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
385 
386                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
387                                                      vid);
388                 }
389                 if (ret != NET_XMIT_SUCCESS)
390                         goto dropped_freed;
391         }
392 
393         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
394         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
395         goto end;
396 
397 dropped:
398         kfree_skb(skb);
399 dropped_freed:
400         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
401 end:
402         if (mcast_single_orig)
403                 batadv_orig_node_put(mcast_single_orig);
404         if (primary_if)
405                 batadv_hardif_put(primary_if);
406         return NETDEV_TX_OK;
407 }
408 
409 /**
410  * batadv_interface_rx - receive ethernet frame on local batman-adv interface
411  * @soft_iface: local interface which will receive the ethernet frame
412  * @skb: ethernet frame for @soft_iface
413  * @hdr_size: size of already parsed batman-adv header
414  * @orig_node: originator from which the batman-adv packet was sent
415  *
416  * Sends a ethernet frame to the receive path of the local @soft_iface.
417  * skb->data has still point to the batman-adv header with the size @hdr_size.
418  * The caller has to have parsed this header already and made sure that at least
419  * @hdr_size bytes are still available for pull in @skb.
420  *
421  * The packet may still get dropped. This can happen when the encapsulated
422  * ethernet frame is invalid or contains again an batman-adv packet. Also
423  * unicast packets will be dropped directly when it was sent between two
424  * isolated clients.
425  */
426 void batadv_interface_rx(struct net_device *soft_iface,
427                          struct sk_buff *skb, int hdr_size,
428                          struct batadv_orig_node *orig_node)
429 {
430         struct batadv_bcast_packet *batadv_bcast_packet;
431         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
432         struct vlan_ethhdr *vhdr;
433         struct ethhdr *ethhdr;
434         unsigned short vid;
435         bool is_bcast;
436 
437         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
438         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
439 
440         skb_pull_rcsum(skb, hdr_size);
441         skb_reset_mac_header(skb);
442 
443         /* clean the netfilter state now that the batman-adv header has been
444          * removed
445          */
446         nf_reset(skb);
447 
448         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
449                 goto dropped;
450 
451         vid = batadv_get_vid(skb, 0);
452         ethhdr = eth_hdr(skb);
453 
454         switch (ntohs(ethhdr->h_proto)) {
455         case ETH_P_8021Q:
456                 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
457                         goto dropped;
458 
459                 vhdr = (struct vlan_ethhdr *)skb->data;
460 
461                 /* drop batman-in-batman packets to prevent loops */
462                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
463                         break;
464 
465                 /* fall through */
466         case ETH_P_BATMAN:
467                 goto dropped;
468         }
469 
470         /* skb->dev & skb->pkt_type are set here */
471         skb->protocol = eth_type_trans(skb, soft_iface);
472 
473         /* should not be necessary anymore as we use skb_pull_rcsum()
474          * TODO: please verify this and remove this TODO
475          * -- Dec 21st 2009, Simon Wunderlich
476          */
477 
478         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
479 
480         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
481         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
482                            skb->len + ETH_HLEN);
483 
484         soft_iface->last_rx = jiffies;
485 
486         /* Let the bridge loop avoidance check the packet. If will
487          * not handle it, we can safely push it up.
488          */
489         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
490                 goto out;
491 
492         if (orig_node)
493                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
494                                                      ethhdr->h_source, vid);
495 
496         if (is_multicast_ether_addr(ethhdr->h_dest)) {
497                 /* set the mark on broadcast packets if AP isolation is ON and
498                  * the packet is coming from an "isolated" client
499                  */
500                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
501                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
502                                                  vid)) {
503                         /* save bits in skb->mark not covered by the mask and
504                          * apply the mark on the rest
505                          */
506                         skb->mark &= ~bat_priv->isolation_mark_mask;
507                         skb->mark |= bat_priv->isolation_mark;
508                 }
509         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
510                                          ethhdr->h_dest, vid)) {
511                 goto dropped;
512         }
513 
514         netif_rx(skb);
515         goto out;
516 
517 dropped:
518         kfree_skb(skb);
519 out:
520         return;
521 }
522 
523 /**
524  * batadv_softif_vlan_release - release vlan from lists and queue for free after
525  *  rcu grace period
526  * @ref: kref pointer of the vlan object
527  */
528 static void batadv_softif_vlan_release(struct kref *ref)
529 {
530         struct batadv_softif_vlan *vlan;
531 
532         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
533 
534         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
535         hlist_del_rcu(&vlan->list);
536         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
537 
538         kfree_rcu(vlan, rcu);
539 }
540 
541 /**
542  * batadv_softif_vlan_put - decrease the vlan object refcounter and
543  *  possibly release it
544  * @vlan: the vlan object to release
545  */
546 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
547 {
548         if (!vlan)
549                 return;
550 
551         kref_put(&vlan->refcount, batadv_softif_vlan_release);
552 }
553 
554 /**
555  * batadv_softif_vlan_get - get the vlan object for a specific vid
556  * @bat_priv: the bat priv with all the soft interface information
557  * @vid: the identifier of the vlan object to retrieve
558  *
559  * Return: the private data of the vlan matching the vid passed as argument or
560  * NULL otherwise. The refcounter of the returned object is incremented by 1.
561  */
562 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
563                                                   unsigned short vid)
564 {
565         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
566 
567         rcu_read_lock();
568         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
569                 if (vlan_tmp->vid != vid)
570                         continue;
571 
572                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
573                         continue;
574 
575                 vlan = vlan_tmp;
576                 break;
577         }
578         rcu_read_unlock();
579 
580         return vlan;
581 }
582 
583 /**
584  * batadv_softif_create_vlan - allocate the needed resources for a new vlan
585  * @bat_priv: the bat priv with all the soft interface information
586  * @vid: the VLAN identifier
587  *
588  * Return: 0 on success, a negative error otherwise.
589  */
590 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
591 {
592         struct batadv_softif_vlan *vlan;
593         int err;
594 
595         vlan = batadv_softif_vlan_get(bat_priv, vid);
596         if (vlan) {
597                 batadv_softif_vlan_put(vlan);
598                 return -EEXIST;
599         }
600 
601         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
602         if (!vlan)
603                 return -ENOMEM;
604 
605         vlan->bat_priv = bat_priv;
606         vlan->vid = vid;
607         kref_init(&vlan->refcount);
608 
609         atomic_set(&vlan->ap_isolation, 0);
610 
611         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
612         if (err) {
613                 kfree(vlan);
614                 return err;
615         }
616 
617         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
618         kref_get(&vlan->refcount);
619         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
620         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
621 
622         /* add a new TT local entry. This one will be marked with the NOPURGE
623          * flag
624          */
625         batadv_tt_local_add(bat_priv->soft_iface,
626                             bat_priv->soft_iface->dev_addr, vid,
627                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
628 
629         /* don't return reference to new softif_vlan */
630         batadv_softif_vlan_put(vlan);
631 
632         return 0;
633 }
634 
635 /**
636  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
637  * @bat_priv: the bat priv with all the soft interface information
638  * @vlan: the object to remove
639  */
640 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
641                                        struct batadv_softif_vlan *vlan)
642 {
643         /* explicitly remove the associated TT local entry because it is marked
644          * with the NOPURGE flag
645          */
646         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
647                                vlan->vid, "vlan interface destroyed", false);
648 
649         batadv_sysfs_del_vlan(bat_priv, vlan);
650         batadv_softif_vlan_put(vlan);
651 }
652 
653 /**
654  * batadv_interface_add_vid - ndo_add_vid API implementation
655  * @dev: the netdev of the mesh interface
656  * @proto: protocol of the the vlan id
657  * @vid: identifier of the new vlan
658  *
659  * Set up all the internal structures for handling the new vlan on top of the
660  * mesh interface
661  *
662  * Return: 0 on success or a negative error code in case of failure.
663  */
664 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
665                                     unsigned short vid)
666 {
667         struct batadv_priv *bat_priv = netdev_priv(dev);
668         struct batadv_softif_vlan *vlan;
669         int ret;
670 
671         /* only 802.1Q vlans are supported.
672          * batman-adv does not know how to handle other types
673          */
674         if (proto != htons(ETH_P_8021Q))
675                 return -EINVAL;
676 
677         vid |= BATADV_VLAN_HAS_TAG;
678 
679         /* if a new vlan is getting created and it already exists, it means that
680          * it was not deleted yet. batadv_softif_vlan_get() increases the
681          * refcount in order to revive the object.
682          *
683          * if it does not exist then create it.
684          */
685         vlan = batadv_softif_vlan_get(bat_priv, vid);
686         if (!vlan)
687                 return batadv_softif_create_vlan(bat_priv, vid);
688 
689         /* recreate the sysfs object if it was already destroyed (and it should
690          * be since we received a kill_vid() for this vlan
691          */
692         if (!vlan->kobj) {
693                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
694                 if (ret) {
695                         batadv_softif_vlan_put(vlan);
696                         return ret;
697                 }
698         }
699 
700         /* add a new TT local entry. This one will be marked with the NOPURGE
701          * flag. This must be added again, even if the vlan object already
702          * exists, because the entry was deleted by kill_vid()
703          */
704         batadv_tt_local_add(bat_priv->soft_iface,
705                             bat_priv->soft_iface->dev_addr, vid,
706                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
707 
708         return 0;
709 }
710 
711 /**
712  * batadv_interface_kill_vid - ndo_kill_vid API implementation
713  * @dev: the netdev of the mesh interface
714  * @proto: protocol of the the vlan id
715  * @vid: identifier of the deleted vlan
716  *
717  * Destroy all the internal structures used to handle the vlan identified by vid
718  * on top of the mesh interface
719  *
720  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
721  * or -ENOENT if the specified vlan id wasn't registered.
722  */
723 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
724                                      unsigned short vid)
725 {
726         struct batadv_priv *bat_priv = netdev_priv(dev);
727         struct batadv_softif_vlan *vlan;
728 
729         /* only 802.1Q vlans are supported. batman-adv does not know how to
730          * handle other types
731          */
732         if (proto != htons(ETH_P_8021Q))
733                 return -EINVAL;
734 
735         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
736         if (!vlan)
737                 return -ENOENT;
738 
739         batadv_softif_destroy_vlan(bat_priv, vlan);
740 
741         /* finally free the vlan object */
742         batadv_softif_vlan_put(vlan);
743 
744         return 0;
745 }
746 
747 /* batman-adv network devices have devices nesting below it and are a special
748  * "super class" of normal network devices; split their locks off into a
749  * separate class since they always nest.
750  */
751 static struct lock_class_key batadv_netdev_xmit_lock_key;
752 static struct lock_class_key batadv_netdev_addr_lock_key;
753 
754 /**
755  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
756  * @dev: device which owns the tx queue
757  * @txq: tx queue to modify
758  * @_unused: always NULL
759  */
760 static void batadv_set_lockdep_class_one(struct net_device *dev,
761                                          struct netdev_queue *txq,
762                                          void *_unused)
763 {
764         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
765 }
766 
767 /**
768  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
769  * @dev: network device to modify
770  */
771 static void batadv_set_lockdep_class(struct net_device *dev)
772 {
773         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
774         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
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 
795         /* batadv_interface_stats() needs to be available as soon as
796          * register_netdevice() has been called
797          */
798         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
799         if (!bat_priv->bat_counters)
800                 return -ENOMEM;
801 
802         atomic_set(&bat_priv->aggregated_ogms, 1);
803         atomic_set(&bat_priv->bonding, 0);
804 #ifdef CONFIG_BATMAN_ADV_BLA
805         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
806 #endif
807 #ifdef CONFIG_BATMAN_ADV_DAT
808         atomic_set(&bat_priv->distributed_arp_table, 1);
809 #endif
810 #ifdef CONFIG_BATMAN_ADV_MCAST
811         bat_priv->mcast.querier_ipv4.exists = false;
812         bat_priv->mcast.querier_ipv4.shadowing = false;
813         bat_priv->mcast.querier_ipv6.exists = false;
814         bat_priv->mcast.querier_ipv6.shadowing = false;
815         bat_priv->mcast.flags = BATADV_NO_FLAGS;
816         atomic_set(&bat_priv->multicast_mode, 1);
817         atomic_set(&bat_priv->mcast.num_disabled, 0);
818         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
819         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
820         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
821 #endif
822         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
823         atomic_set(&bat_priv->gw.sel_class, 20);
824         atomic_set(&bat_priv->gw.bandwidth_down, 100);
825         atomic_set(&bat_priv->gw.bandwidth_up, 20);
826         atomic_set(&bat_priv->orig_interval, 1000);
827         atomic_set(&bat_priv->hop_penalty, 30);
828 #ifdef CONFIG_BATMAN_ADV_DEBUG
829         atomic_set(&bat_priv->log_level, 0);
830 #endif
831         atomic_set(&bat_priv->fragmentation, 1);
832         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
833         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
834         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
835 
836         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
837         atomic_set(&bat_priv->bcast_seqno, 1);
838         atomic_set(&bat_priv->tt.vn, 0);
839         atomic_set(&bat_priv->tt.local_changes, 0);
840         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
841 #ifdef CONFIG_BATMAN_ADV_BLA
842         atomic_set(&bat_priv->bla.num_requests, 0);
843 #endif
844         atomic_set(&bat_priv->tp_num, 0);
845 
846         bat_priv->tt.last_changeset = NULL;
847         bat_priv->tt.last_changeset_len = 0;
848         bat_priv->isolation_mark = 0;
849         bat_priv->isolation_mark_mask = 0;
850 
851         /* randomize initial seqno to avoid collision */
852         get_random_bytes(&random_seqno, sizeof(random_seqno));
853         atomic_set(&bat_priv->frag_seqno, random_seqno);
854 
855         bat_priv->primary_if = NULL;
856         bat_priv->num_ifaces = 0;
857 
858         batadv_nc_init_bat_priv(bat_priv);
859 
860         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
861         if (ret < 0)
862                 goto free_bat_counters;
863 
864         ret = batadv_debugfs_add_meshif(dev);
865         if (ret < 0)
866                 goto free_bat_counters;
867 
868         ret = batadv_mesh_init(dev);
869         if (ret < 0)
870                 goto unreg_debugfs;
871 
872         return 0;
873 
874 unreg_debugfs:
875         batadv_debugfs_del_meshif(dev);
876 free_bat_counters:
877         free_percpu(bat_priv->bat_counters);
878         bat_priv->bat_counters = NULL;
879 
880         return ret;
881 }
882 
883 /**
884  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
885  * @dev: batadv_soft_interface used as master interface
886  * @slave_dev: net_device which should become the slave interface
887  *
888  * Return: 0 if successful or error otherwise.
889  */
890 static int batadv_softif_slave_add(struct net_device *dev,
891                                    struct net_device *slave_dev)
892 {
893         struct batadv_hard_iface *hard_iface;
894         struct net *net = dev_net(dev);
895         int ret = -EINVAL;
896 
897         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
898         if (!hard_iface || hard_iface->soft_iface)
899                 goto out;
900 
901         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
902 
903 out:
904         if (hard_iface)
905                 batadv_hardif_put(hard_iface);
906         return ret;
907 }
908 
909 /**
910  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
911  * @dev: batadv_soft_interface used as master interface
912  * @slave_dev: net_device which should be removed from the master interface
913  *
914  * Return: 0 if successful or error otherwise.
915  */
916 static int batadv_softif_slave_del(struct net_device *dev,
917                                    struct net_device *slave_dev)
918 {
919         struct batadv_hard_iface *hard_iface;
920         int ret = -EINVAL;
921 
922         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
923 
924         if (!hard_iface || hard_iface->soft_iface != dev)
925                 goto out;
926 
927         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
928         ret = 0;
929 
930 out:
931         if (hard_iface)
932                 batadv_hardif_put(hard_iface);
933         return ret;
934 }
935 
936 static const struct net_device_ops batadv_netdev_ops = {
937         .ndo_init = batadv_softif_init_late,
938         .ndo_open = batadv_interface_open,
939         .ndo_stop = batadv_interface_release,
940         .ndo_get_stats = batadv_interface_stats,
941         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
942         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
943         .ndo_set_mac_address = batadv_interface_set_mac_addr,
944         .ndo_change_mtu = batadv_interface_change_mtu,
945         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
946         .ndo_start_xmit = batadv_interface_tx,
947         .ndo_validate_addr = eth_validate_addr,
948         .ndo_add_slave = batadv_softif_slave_add,
949         .ndo_del_slave = batadv_softif_slave_del,
950 };
951 
952 /**
953  * batadv_softif_free - Deconstructor of batadv_soft_interface
954  * @dev: Device to cleanup and remove
955  */
956 static void batadv_softif_free(struct net_device *dev)
957 {
958         batadv_debugfs_del_meshif(dev);
959         batadv_mesh_free(dev);
960 
961         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
962          * their tasks. Wait for them all to be finished before freeing the
963          * netdev and its private data (bat_priv)
964          */
965         rcu_barrier();
966 
967         free_netdev(dev);
968 }
969 
970 /**
971  * batadv_softif_init_early - early stage initialization of soft interface
972  * @dev: registered network device to modify
973  */
974 static void batadv_softif_init_early(struct net_device *dev)
975 {
976         struct batadv_priv *priv = netdev_priv(dev);
977 
978         ether_setup(dev);
979 
980         dev->netdev_ops = &batadv_netdev_ops;
981         dev->destructor = batadv_softif_free;
982         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
983         dev->priv_flags |= IFF_NO_QUEUE;
984 
985         /* can't call min_mtu, because the needed variables
986          * have not been initialized yet
987          */
988         dev->mtu = ETH_DATA_LEN;
989 
990         /* generate random address */
991         eth_hw_addr_random(dev);
992 
993         dev->ethtool_ops = &batadv_ethtool_ops;
994 
995         memset(priv, 0, sizeof(*priv));
996 }
997 
998 struct net_device *batadv_softif_create(struct net *net, const char *name)
999 {
1000         struct net_device *soft_iface;
1001         int ret;
1002 
1003         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1004                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1005         if (!soft_iface)
1006                 return NULL;
1007 
1008         dev_net_set(soft_iface, net);
1009 
1010         soft_iface->rtnl_link_ops = &batadv_link_ops;
1011 
1012         ret = register_netdevice(soft_iface);
1013         if (ret < 0) {
1014                 pr_err("Unable to register the batman interface '%s': %i\n",
1015                        name, ret);
1016                 free_netdev(soft_iface);
1017                 return NULL;
1018         }
1019 
1020         return soft_iface;
1021 }
1022 
1023 /**
1024  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
1025  * @soft_iface: the to-be-removed batman-adv interface
1026  */
1027 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1028 {
1029         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1030         struct batadv_softif_vlan *vlan;
1031 
1032         ASSERT_RTNL();
1033 
1034         /* destroy the "untagged" VLAN */
1035         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1036         if (vlan) {
1037                 batadv_softif_destroy_vlan(bat_priv, vlan);
1038                 batadv_softif_vlan_put(vlan);
1039         }
1040 
1041         batadv_sysfs_del_meshif(soft_iface);
1042         unregister_netdevice(soft_iface);
1043 }
1044 
1045 /**
1046  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
1047  * @soft_iface: the to-be-removed batman-adv interface
1048  * @head: list pointer
1049  */
1050 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1051                                           struct list_head *head)
1052 {
1053         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1054         struct batadv_hard_iface *hard_iface;
1055         struct batadv_softif_vlan *vlan;
1056 
1057         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1058                 if (hard_iface->soft_iface == soft_iface)
1059                         batadv_hardif_disable_interface(hard_iface,
1060                                                         BATADV_IF_CLEANUP_KEEP);
1061         }
1062 
1063         /* destroy the "untagged" VLAN */
1064         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1065         if (vlan) {
1066                 batadv_softif_destroy_vlan(bat_priv, vlan);
1067                 batadv_softif_vlan_put(vlan);
1068         }
1069 
1070         batadv_sysfs_del_meshif(soft_iface);
1071         unregister_netdevice_queue(soft_iface, head);
1072 }
1073 
1074 bool batadv_softif_is_valid(const struct net_device *net_dev)
1075 {
1076         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1077                 return true;
1078 
1079         return false;
1080 }
1081 
1082 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1083         .kind           = "batadv",
1084         .priv_size      = sizeof(struct batadv_priv),
1085         .setup          = batadv_softif_init_early,
1086         .dellink        = batadv_softif_destroy_netlink,
1087 };
1088 
1089 /* ethtool */
1090 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1091 {
1092         cmd->supported = 0;
1093         cmd->advertising = 0;
1094         ethtool_cmd_speed_set(cmd, SPEED_10);
1095         cmd->duplex = DUPLEX_FULL;
1096         cmd->port = PORT_TP;
1097         cmd->phy_address = 0;
1098         cmd->transceiver = XCVR_INTERNAL;
1099         cmd->autoneg = AUTONEG_DISABLE;
1100         cmd->maxtxpkt = 0;
1101         cmd->maxrxpkt = 0;
1102 
1103         return 0;
1104 }
1105 
1106 static void batadv_get_drvinfo(struct net_device *dev,
1107                                struct ethtool_drvinfo *info)
1108 {
1109         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1110         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1111         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1112         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1113 }
1114 
1115 static u32 batadv_get_msglevel(struct net_device *dev)
1116 {
1117         return -EOPNOTSUPP;
1118 }
1119 
1120 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1121 {
1122 }
1123 
1124 static u32 batadv_get_link(struct net_device *dev)
1125 {
1126         return 1;
1127 }
1128 
1129 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1130  * Declare each description string in struct.name[] to get fixed sized buffer
1131  * and compile time checking for strings longer than ETH_GSTRING_LEN.
1132  */
1133 static const struct {
1134         const char name[ETH_GSTRING_LEN];
1135 } batadv_counters_strings[] = {
1136         { "tx" },
1137         { "tx_bytes" },
1138         { "tx_dropped" },
1139         { "rx" },
1140         { "rx_bytes" },
1141         { "forward" },
1142         { "forward_bytes" },
1143         { "mgmt_tx" },
1144         { "mgmt_tx_bytes" },
1145         { "mgmt_rx" },
1146         { "mgmt_rx_bytes" },
1147         { "frag_tx" },
1148         { "frag_tx_bytes" },
1149         { "frag_rx" },
1150         { "frag_rx_bytes" },
1151         { "frag_fwd" },
1152         { "frag_fwd_bytes" },
1153         { "tt_request_tx" },
1154         { "tt_request_rx" },
1155         { "tt_response_tx" },
1156         { "tt_response_rx" },
1157         { "tt_roam_adv_tx" },
1158         { "tt_roam_adv_rx" },
1159 #ifdef CONFIG_BATMAN_ADV_DAT
1160         { "dat_get_tx" },
1161         { "dat_get_rx" },
1162         { "dat_put_tx" },
1163         { "dat_put_rx" },
1164         { "dat_cached_reply_tx" },
1165 #endif
1166 #ifdef CONFIG_BATMAN_ADV_NC
1167         { "nc_code" },
1168         { "nc_code_bytes" },
1169         { "nc_recode" },
1170         { "nc_recode_bytes" },
1171         { "nc_buffer" },
1172         { "nc_decode" },
1173         { "nc_decode_bytes" },
1174         { "nc_decode_failed" },
1175         { "nc_sniffed" },
1176 #endif
1177 };
1178 
1179 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1180 {
1181         if (stringset == ETH_SS_STATS)
1182                 memcpy(data, batadv_counters_strings,
1183                        sizeof(batadv_counters_strings));
1184 }
1185 
1186 static void batadv_get_ethtool_stats(struct net_device *dev,
1187                                      struct ethtool_stats *stats, u64 *data)
1188 {
1189         struct batadv_priv *bat_priv = netdev_priv(dev);
1190         int i;
1191 
1192         for (i = 0; i < BATADV_CNT_NUM; i++)
1193                 data[i] = batadv_sum_counter(bat_priv, i);
1194 }
1195 
1196 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1197 {
1198         if (stringset == ETH_SS_STATS)
1199                 return BATADV_CNT_NUM;
1200 
1201         return -EOPNOTSUPP;
1202 }
1203 

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