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

Version: ~ [ linux-5.12-rc6 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /* Copyright (C) 2007-2017  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 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
 68 {
 69         int result;
 70 
 71         /* TODO: We must check if we can release all references to non-payload
 72          * data using skb_header_release in our skbs to allow skb_cow_header to
 73          * work optimally. This means that those skbs are not allowed to read
 74          * or write any data which is before the current position of skb->data
 75          * after that call and thus allow other skbs with the same data buffer
 76          * to write freely in that area.
 77          */
 78         result = skb_cow_head(skb, len);
 79         if (result < 0)
 80                 return result;
 81 
 82         skb_push(skb, len);
 83         return 0;
 84 }
 85 
 86 static int batadv_interface_open(struct net_device *dev)
 87 {
 88         netif_start_queue(dev);
 89         return 0;
 90 }
 91 
 92 static int batadv_interface_release(struct net_device *dev)
 93 {
 94         netif_stop_queue(dev);
 95         return 0;
 96 }
 97 
 98 /**
 99  * batadv_sum_counter - Sum the cpu-local counters for index 'idx'
100  * @bat_priv: the bat priv with all the soft interface information
101  * @idx: index of counter to sum up
102  *
103  * Return: sum of all cpu-local counters
104  */
105 static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
106 {
107         u64 *counters, sum = 0;
108         int cpu;
109 
110         for_each_possible_cpu(cpu) {
111                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
112                 sum += counters[idx];
113         }
114 
115         return sum;
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 = &dev->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         /* reset control block to avoid left overs from previous users */
212         memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
213 
214         netif_trans_update(soft_iface);
215         vid = batadv_get_vid(skb, 0);
216         ethhdr = eth_hdr(skb);
217 
218         switch (ntohs(ethhdr->h_proto)) {
219         case ETH_P_8021Q:
220                 vhdr = vlan_eth_hdr(skb);
221 
222                 /* drop batman-in-batman packets to prevent loops */
223                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
224                         network_offset += VLAN_HLEN;
225                         break;
226                 }
227 
228                 /* fall through */
229         case ETH_P_BATMAN:
230                 goto dropped;
231         }
232 
233         skb_set_network_header(skb, network_offset);
234 
235         if (batadv_bla_tx(bat_priv, skb, vid))
236                 goto dropped;
237 
238         /* skb->data might have been reallocated by batadv_bla_tx() */
239         ethhdr = eth_hdr(skb);
240 
241         /* Register the client MAC in the transtable */
242         if (!is_multicast_ether_addr(ethhdr->h_source) &&
243             !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
244                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
245                                                    vid, skb->skb_iif,
246                                                    skb->mark);
247                 if (!client_added)
248                         goto dropped;
249         }
250 
251         /* don't accept stp packets. STP does not help in meshes.
252          * better use the bridge loop avoidance ...
253          *
254          * The same goes for ECTP sent at least by some Cisco Switches,
255          * it might confuse the mesh when used with bridge loop avoidance.
256          */
257         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
258                 goto dropped;
259 
260         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
261                 goto dropped;
262 
263         gw_mode = atomic_read(&bat_priv->gw.mode);
264         if (is_multicast_ether_addr(ethhdr->h_dest)) {
265                 /* if gw mode is off, broadcast every packet */
266                 if (gw_mode == BATADV_GW_MODE_OFF) {
267                         do_bcast = true;
268                         goto send;
269                 }
270 
271                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
272                                                         chaddr);
273                 /* skb->data may have been modified by
274                  * batadv_gw_dhcp_recipient_get()
275                  */
276                 ethhdr = eth_hdr(skb);
277                 /* if gw_mode is on, broadcast any non-DHCP message.
278                  * All the DHCP packets are going to be sent as unicast
279                  */
280                 if (dhcp_rcp == BATADV_DHCP_NO) {
281                         do_bcast = true;
282                         goto send;
283                 }
284 
285                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
286                         dst_hint = chaddr;
287                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
288                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
289                         /* gateways should not forward any DHCP message if
290                          * directed to a DHCP server
291                          */
292                         goto dropped;
293 
294 send:
295                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
296                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
297                                                            &mcast_single_orig);
298                         if (forw_mode == BATADV_FORW_NONE)
299                                 goto dropped;
300 
301                         if (forw_mode == BATADV_FORW_SINGLE)
302                                 do_bcast = false;
303                 }
304         }
305 
306         batadv_skb_set_priority(skb, 0);
307 
308         /* ethernet packet should be broadcasted */
309         if (do_bcast) {
310                 primary_if = batadv_primary_if_get_selected(bat_priv);
311                 if (!primary_if)
312                         goto dropped;
313 
314                 /* in case of ARP request, we do not immediately broadcasti the
315                  * packet, instead we first wait for DAT to try to retrieve the
316                  * correct ARP entry
317                  */
318                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
319                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
320 
321                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
322                         goto dropped;
323 
324                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
325                 bcast_packet->version = BATADV_COMPAT_VERSION;
326                 bcast_packet->ttl = BATADV_TTL;
327 
328                 /* batman packet type: broadcast */
329                 bcast_packet->packet_type = BATADV_BCAST;
330                 bcast_packet->reserved = 0;
331 
332                 /* hw address of first interface is the orig mac because only
333                  * this mac is known throughout the mesh
334                  */
335                 ether_addr_copy(bcast_packet->orig,
336                                 primary_if->net_dev->dev_addr);
337 
338                 /* set broadcast sequence number */
339                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
340                 bcast_packet->seqno = htonl(seqno);
341 
342                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
343 
344                 /* a copy is stored in the bcast list, therefore removing
345                  * the original skb.
346                  */
347                 consume_skb(skb);
348 
349         /* unicast packet */
350         } else {
351                 /* DHCP packets going to a server will use the GW feature */
352                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
353                         ret = batadv_gw_out_of_range(bat_priv, skb);
354                         if (ret)
355                                 goto dropped;
356                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
357                 } else if (mcast_single_orig) {
358                         ret = batadv_send_skb_unicast(bat_priv, skb,
359                                                       BATADV_UNICAST, 0,
360                                                       mcast_single_orig, vid);
361                 } else {
362                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
363                                                                   skb))
364                                 goto dropped;
365 
366                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
367 
368                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
369                                                      vid);
370                 }
371                 if (ret != NET_XMIT_SUCCESS)
372                         goto dropped_freed;
373         }
374 
375         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
376         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
377         goto end;
378 
379 dropped:
380         kfree_skb(skb);
381 dropped_freed:
382         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
383 end:
384         if (mcast_single_orig)
385                 batadv_orig_node_put(mcast_single_orig);
386         if (primary_if)
387                 batadv_hardif_put(primary_if);
388         return NETDEV_TX_OK;
389 }
390 
391 /**
392  * batadv_interface_rx - receive ethernet frame on local batman-adv interface
393  * @soft_iface: local interface which will receive the ethernet frame
394  * @skb: ethernet frame for @soft_iface
395  * @hdr_size: size of already parsed batman-adv header
396  * @orig_node: originator from which the batman-adv packet was sent
397  *
398  * Sends a ethernet frame to the receive path of the local @soft_iface.
399  * skb->data has still point to the batman-adv header with the size @hdr_size.
400  * The caller has to have parsed this header already and made sure that at least
401  * @hdr_size bytes are still available for pull in @skb.
402  *
403  * The packet may still get dropped. This can happen when the encapsulated
404  * ethernet frame is invalid or contains again an batman-adv packet. Also
405  * unicast packets will be dropped directly when it was sent between two
406  * isolated clients.
407  */
408 void batadv_interface_rx(struct net_device *soft_iface,
409                          struct sk_buff *skb, int hdr_size,
410                          struct batadv_orig_node *orig_node)
411 {
412         struct batadv_bcast_packet *batadv_bcast_packet;
413         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
414         struct vlan_ethhdr *vhdr;
415         struct ethhdr *ethhdr;
416         unsigned short vid;
417         bool is_bcast;
418 
419         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
420         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
421 
422         skb_pull_rcsum(skb, hdr_size);
423         skb_reset_mac_header(skb);
424 
425         /* clean the netfilter state now that the batman-adv header has been
426          * removed
427          */
428         nf_reset(skb);
429 
430         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
431                 goto dropped;
432 
433         vid = batadv_get_vid(skb, 0);
434         ethhdr = eth_hdr(skb);
435 
436         switch (ntohs(ethhdr->h_proto)) {
437         case ETH_P_8021Q:
438                 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
439                         goto dropped;
440 
441                 vhdr = (struct vlan_ethhdr *)skb->data;
442 
443                 /* drop batman-in-batman packets to prevent loops */
444                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
445                         break;
446 
447                 /* fall through */
448         case ETH_P_BATMAN:
449                 goto dropped;
450         }
451 
452         /* skb->dev & skb->pkt_type are set here */
453         skb->protocol = eth_type_trans(skb, soft_iface);
454 
455         /* should not be necessary anymore as we use skb_pull_rcsum()
456          * TODO: please verify this and remove this TODO
457          * -- Dec 21st 2009, Simon Wunderlich
458          */
459 
460         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
461 
462         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
463         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
464                            skb->len + ETH_HLEN);
465 
466         /* Let the bridge loop avoidance check the packet. If will
467          * not handle it, we can safely push it up.
468          */
469         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
470                 goto out;
471 
472         if (orig_node)
473                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
474                                                      ethhdr->h_source, vid);
475 
476         if (is_multicast_ether_addr(ethhdr->h_dest)) {
477                 /* set the mark on broadcast packets if AP isolation is ON and
478                  * the packet is coming from an "isolated" client
479                  */
480                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
481                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
482                                                  vid)) {
483                         /* save bits in skb->mark not covered by the mask and
484                          * apply the mark on the rest
485                          */
486                         skb->mark &= ~bat_priv->isolation_mark_mask;
487                         skb->mark |= bat_priv->isolation_mark;
488                 }
489         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
490                                          ethhdr->h_dest, vid)) {
491                 goto dropped;
492         }
493 
494         netif_rx(skb);
495         goto out;
496 
497 dropped:
498         kfree_skb(skb);
499 out:
500         return;
501 }
502 
503 /**
504  * batadv_softif_vlan_release - release vlan from lists and queue for free after
505  *  rcu grace period
506  * @ref: kref pointer of the vlan object
507  */
508 static void batadv_softif_vlan_release(struct kref *ref)
509 {
510         struct batadv_softif_vlan *vlan;
511 
512         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
513 
514         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
515         hlist_del_rcu(&vlan->list);
516         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
517 
518         kfree_rcu(vlan, rcu);
519 }
520 
521 /**
522  * batadv_softif_vlan_put - decrease the vlan object refcounter and
523  *  possibly release it
524  * @vlan: the vlan object to release
525  */
526 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
527 {
528         if (!vlan)
529                 return;
530 
531         kref_put(&vlan->refcount, batadv_softif_vlan_release);
532 }
533 
534 /**
535  * batadv_softif_vlan_get - get the vlan object for a specific vid
536  * @bat_priv: the bat priv with all the soft interface information
537  * @vid: the identifier of the vlan object to retrieve
538  *
539  * Return: the private data of the vlan matching the vid passed as argument or
540  * NULL otherwise. The refcounter of the returned object is incremented by 1.
541  */
542 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
543                                                   unsigned short vid)
544 {
545         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
546 
547         rcu_read_lock();
548         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
549                 if (vlan_tmp->vid != vid)
550                         continue;
551 
552                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
553                         continue;
554 
555                 vlan = vlan_tmp;
556                 break;
557         }
558         rcu_read_unlock();
559 
560         return vlan;
561 }
562 
563 /**
564  * batadv_softif_create_vlan - allocate the needed resources for a new vlan
565  * @bat_priv: the bat priv with all the soft interface information
566  * @vid: the VLAN identifier
567  *
568  * Return: 0 on success, a negative error otherwise.
569  */
570 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
571 {
572         struct batadv_softif_vlan *vlan;
573         int err;
574 
575         vlan = batadv_softif_vlan_get(bat_priv, vid);
576         if (vlan) {
577                 batadv_softif_vlan_put(vlan);
578                 return -EEXIST;
579         }
580 
581         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
582         if (!vlan)
583                 return -ENOMEM;
584 
585         vlan->bat_priv = bat_priv;
586         vlan->vid = vid;
587         kref_init(&vlan->refcount);
588 
589         atomic_set(&vlan->ap_isolation, 0);
590 
591         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
592         if (err) {
593                 kfree(vlan);
594                 return err;
595         }
596 
597         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
598         kref_get(&vlan->refcount);
599         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
600         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
601 
602         /* add a new TT local entry. This one will be marked with the NOPURGE
603          * flag
604          */
605         batadv_tt_local_add(bat_priv->soft_iface,
606                             bat_priv->soft_iface->dev_addr, vid,
607                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
608 
609         /* don't return reference to new softif_vlan */
610         batadv_softif_vlan_put(vlan);
611 
612         return 0;
613 }
614 
615 /**
616  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
617  * @bat_priv: the bat priv with all the soft interface information
618  * @vlan: the object to remove
619  */
620 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
621                                        struct batadv_softif_vlan *vlan)
622 {
623         /* explicitly remove the associated TT local entry because it is marked
624          * with the NOPURGE flag
625          */
626         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
627                                vlan->vid, "vlan interface destroyed", false);
628 
629         batadv_sysfs_del_vlan(bat_priv, vlan);
630         batadv_softif_vlan_put(vlan);
631 }
632 
633 /**
634  * batadv_interface_add_vid - ndo_add_vid API implementation
635  * @dev: the netdev of the mesh interface
636  * @proto: protocol of the the vlan id
637  * @vid: identifier of the new vlan
638  *
639  * Set up all the internal structures for handling the new vlan on top of the
640  * mesh interface
641  *
642  * Return: 0 on success or a negative error code in case of failure.
643  */
644 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
645                                     unsigned short vid)
646 {
647         struct batadv_priv *bat_priv = netdev_priv(dev);
648         struct batadv_softif_vlan *vlan;
649         int ret;
650 
651         /* only 802.1Q vlans are supported.
652          * batman-adv does not know how to handle other types
653          */
654         if (proto != htons(ETH_P_8021Q))
655                 return -EINVAL;
656 
657         vid |= BATADV_VLAN_HAS_TAG;
658 
659         /* if a new vlan is getting created and it already exists, it means that
660          * it was not deleted yet. batadv_softif_vlan_get() increases the
661          * refcount in order to revive the object.
662          *
663          * if it does not exist then create it.
664          */
665         vlan = batadv_softif_vlan_get(bat_priv, vid);
666         if (!vlan)
667                 return batadv_softif_create_vlan(bat_priv, vid);
668 
669         /* recreate the sysfs object if it was already destroyed (and it should
670          * be since we received a kill_vid() for this vlan
671          */
672         if (!vlan->kobj) {
673                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
674                 if (ret) {
675                         batadv_softif_vlan_put(vlan);
676                         return ret;
677                 }
678         }
679 
680         /* add a new TT local entry. This one will be marked with the NOPURGE
681          * flag. This must be added again, even if the vlan object already
682          * exists, because the entry was deleted by kill_vid()
683          */
684         batadv_tt_local_add(bat_priv->soft_iface,
685                             bat_priv->soft_iface->dev_addr, vid,
686                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
687 
688         return 0;
689 }
690 
691 /**
692  * batadv_interface_kill_vid - ndo_kill_vid API implementation
693  * @dev: the netdev of the mesh interface
694  * @proto: protocol of the the vlan id
695  * @vid: identifier of the deleted vlan
696  *
697  * Destroy all the internal structures used to handle the vlan identified by vid
698  * on top of the mesh interface
699  *
700  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
701  * or -ENOENT if the specified vlan id wasn't registered.
702  */
703 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
704                                      unsigned short vid)
705 {
706         struct batadv_priv *bat_priv = netdev_priv(dev);
707         struct batadv_softif_vlan *vlan;
708 
709         /* only 802.1Q vlans are supported. batman-adv does not know how to
710          * handle other types
711          */
712         if (proto != htons(ETH_P_8021Q))
713                 return -EINVAL;
714 
715         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
716         if (!vlan)
717                 return -ENOENT;
718 
719         batadv_softif_destroy_vlan(bat_priv, vlan);
720 
721         /* finally free the vlan object */
722         batadv_softif_vlan_put(vlan);
723 
724         return 0;
725 }
726 
727 /* batman-adv network devices have devices nesting below it and are a special
728  * "super class" of normal network devices; split their locks off into a
729  * separate class since they always nest.
730  */
731 static struct lock_class_key batadv_netdev_xmit_lock_key;
732 static struct lock_class_key batadv_netdev_addr_lock_key;
733 
734 /**
735  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
736  * @dev: device which owns the tx queue
737  * @txq: tx queue to modify
738  * @_unused: always NULL
739  */
740 static void batadv_set_lockdep_class_one(struct net_device *dev,
741                                          struct netdev_queue *txq,
742                                          void *_unused)
743 {
744         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
745 }
746 
747 /**
748  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
749  * @dev: network device to modify
750  */
751 static void batadv_set_lockdep_class(struct net_device *dev)
752 {
753         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
754         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
755 }
756 
757 /**
758  * batadv_softif_init_late - late stage initialization of soft interface
759  * @dev: registered network device to modify
760  *
761  * Return: error code on failures
762  */
763 static int batadv_softif_init_late(struct net_device *dev)
764 {
765         struct batadv_priv *bat_priv;
766         u32 random_seqno;
767         int ret;
768         size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
769 
770         batadv_set_lockdep_class(dev);
771 
772         bat_priv = netdev_priv(dev);
773         bat_priv->soft_iface = dev;
774 
775         /* batadv_interface_stats() needs to be available as soon as
776          * register_netdevice() has been called
777          */
778         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
779         if (!bat_priv->bat_counters)
780                 return -ENOMEM;
781 
782         atomic_set(&bat_priv->aggregated_ogms, 1);
783         atomic_set(&bat_priv->bonding, 0);
784 #ifdef CONFIG_BATMAN_ADV_BLA
785         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
786 #endif
787 #ifdef CONFIG_BATMAN_ADV_DAT
788         atomic_set(&bat_priv->distributed_arp_table, 1);
789 #endif
790 #ifdef CONFIG_BATMAN_ADV_MCAST
791         bat_priv->mcast.querier_ipv4.exists = false;
792         bat_priv->mcast.querier_ipv4.shadowing = false;
793         bat_priv->mcast.querier_ipv6.exists = false;
794         bat_priv->mcast.querier_ipv6.shadowing = false;
795         bat_priv->mcast.flags = BATADV_NO_FLAGS;
796         atomic_set(&bat_priv->multicast_mode, 1);
797         atomic_set(&bat_priv->mcast.num_disabled, 0);
798         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
799         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
800         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
801 #endif
802         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
803         atomic_set(&bat_priv->gw.bandwidth_down, 100);
804         atomic_set(&bat_priv->gw.bandwidth_up, 20);
805         atomic_set(&bat_priv->orig_interval, 1000);
806         atomic_set(&bat_priv->hop_penalty, 30);
807 #ifdef CONFIG_BATMAN_ADV_DEBUG
808         atomic_set(&bat_priv->log_level, 0);
809 #endif
810         atomic_set(&bat_priv->fragmentation, 1);
811         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
812         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
813         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
814 
815         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
816         atomic_set(&bat_priv->bcast_seqno, 1);
817         atomic_set(&bat_priv->tt.vn, 0);
818         atomic_set(&bat_priv->tt.local_changes, 0);
819         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
820 #ifdef CONFIG_BATMAN_ADV_BLA
821         atomic_set(&bat_priv->bla.num_requests, 0);
822 #endif
823         atomic_set(&bat_priv->tp_num, 0);
824 
825         bat_priv->tt.last_changeset = NULL;
826         bat_priv->tt.last_changeset_len = 0;
827         bat_priv->isolation_mark = 0;
828         bat_priv->isolation_mark_mask = 0;
829 
830         /* randomize initial seqno to avoid collision */
831         get_random_bytes(&random_seqno, sizeof(random_seqno));
832         atomic_set(&bat_priv->frag_seqno, random_seqno);
833 
834         bat_priv->primary_if = NULL;
835         bat_priv->num_ifaces = 0;
836 
837         batadv_nc_init_bat_priv(bat_priv);
838 
839         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
840         if (ret < 0)
841                 goto free_bat_counters;
842 
843         ret = batadv_debugfs_add_meshif(dev);
844         if (ret < 0)
845                 goto free_bat_counters;
846 
847         ret = batadv_mesh_init(dev);
848         if (ret < 0)
849                 goto unreg_debugfs;
850 
851         return 0;
852 
853 unreg_debugfs:
854         batadv_debugfs_del_meshif(dev);
855 free_bat_counters:
856         free_percpu(bat_priv->bat_counters);
857         bat_priv->bat_counters = NULL;
858 
859         return ret;
860 }
861 
862 /**
863  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
864  * @dev: batadv_soft_interface used as master interface
865  * @slave_dev: net_device which should become the slave interface
866  *
867  * Return: 0 if successful or error otherwise.
868  */
869 static int batadv_softif_slave_add(struct net_device *dev,
870                                    struct net_device *slave_dev)
871 {
872         struct batadv_hard_iface *hard_iface;
873         struct net *net = dev_net(dev);
874         int ret = -EINVAL;
875 
876         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
877         if (!hard_iface || hard_iface->soft_iface)
878                 goto out;
879 
880         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
881 
882 out:
883         if (hard_iface)
884                 batadv_hardif_put(hard_iface);
885         return ret;
886 }
887 
888 /**
889  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
890  * @dev: batadv_soft_interface used as master interface
891  * @slave_dev: net_device which should be removed from the master interface
892  *
893  * Return: 0 if successful or error otherwise.
894  */
895 static int batadv_softif_slave_del(struct net_device *dev,
896                                    struct net_device *slave_dev)
897 {
898         struct batadv_hard_iface *hard_iface;
899         int ret = -EINVAL;
900 
901         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
902 
903         if (!hard_iface || hard_iface->soft_iface != dev)
904                 goto out;
905 
906         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
907         ret = 0;
908 
909 out:
910         if (hard_iface)
911                 batadv_hardif_put(hard_iface);
912         return ret;
913 }
914 
915 static const struct net_device_ops batadv_netdev_ops = {
916         .ndo_init = batadv_softif_init_late,
917         .ndo_open = batadv_interface_open,
918         .ndo_stop = batadv_interface_release,
919         .ndo_get_stats = batadv_interface_stats,
920         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
921         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
922         .ndo_set_mac_address = batadv_interface_set_mac_addr,
923         .ndo_change_mtu = batadv_interface_change_mtu,
924         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
925         .ndo_start_xmit = batadv_interface_tx,
926         .ndo_validate_addr = eth_validate_addr,
927         .ndo_add_slave = batadv_softif_slave_add,
928         .ndo_del_slave = batadv_softif_slave_del,
929 };
930 
931 static void batadv_get_drvinfo(struct net_device *dev,
932                                struct ethtool_drvinfo *info)
933 {
934         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
935         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
936         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
937         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
938 }
939 
940 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
941  * Declare each description string in struct.name[] to get fixed sized buffer
942  * and compile time checking for strings longer than ETH_GSTRING_LEN.
943  */
944 static const struct {
945         const char name[ETH_GSTRING_LEN];
946 } batadv_counters_strings[] = {
947         { "tx" },
948         { "tx_bytes" },
949         { "tx_dropped" },
950         { "rx" },
951         { "rx_bytes" },
952         { "forward" },
953         { "forward_bytes" },
954         { "mgmt_tx" },
955         { "mgmt_tx_bytes" },
956         { "mgmt_rx" },
957         { "mgmt_rx_bytes" },
958         { "frag_tx" },
959         { "frag_tx_bytes" },
960         { "frag_rx" },
961         { "frag_rx_bytes" },
962         { "frag_fwd" },
963         { "frag_fwd_bytes" },
964         { "tt_request_tx" },
965         { "tt_request_rx" },
966         { "tt_response_tx" },
967         { "tt_response_rx" },
968         { "tt_roam_adv_tx" },
969         { "tt_roam_adv_rx" },
970 #ifdef CONFIG_BATMAN_ADV_DAT
971         { "dat_get_tx" },
972         { "dat_get_rx" },
973         { "dat_put_tx" },
974         { "dat_put_rx" },
975         { "dat_cached_reply_tx" },
976 #endif
977 #ifdef CONFIG_BATMAN_ADV_NC
978         { "nc_code" },
979         { "nc_code_bytes" },
980         { "nc_recode" },
981         { "nc_recode_bytes" },
982         { "nc_buffer" },
983         { "nc_decode" },
984         { "nc_decode_bytes" },
985         { "nc_decode_failed" },
986         { "nc_sniffed" },
987 #endif
988 };
989 
990 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
991 {
992         if (stringset == ETH_SS_STATS)
993                 memcpy(data, batadv_counters_strings,
994                        sizeof(batadv_counters_strings));
995 }
996 
997 static void batadv_get_ethtool_stats(struct net_device *dev,
998                                      struct ethtool_stats *stats, u64 *data)
999 {
1000         struct batadv_priv *bat_priv = netdev_priv(dev);
1001         int i;
1002 
1003         for (i = 0; i < BATADV_CNT_NUM; i++)
1004                 data[i] = batadv_sum_counter(bat_priv, i);
1005 }
1006 
1007 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1008 {
1009         if (stringset == ETH_SS_STATS)
1010                 return BATADV_CNT_NUM;
1011 
1012         return -EOPNOTSUPP;
1013 }
1014 
1015 static const struct ethtool_ops batadv_ethtool_ops = {
1016         .get_drvinfo = batadv_get_drvinfo,
1017         .get_link = ethtool_op_get_link,
1018         .get_strings = batadv_get_strings,
1019         .get_ethtool_stats = batadv_get_ethtool_stats,
1020         .get_sset_count = batadv_get_sset_count,
1021 };
1022 
1023 /**
1024  * batadv_softif_free - Deconstructor of batadv_soft_interface
1025  * @dev: Device to cleanup and remove
1026  */
1027 static void batadv_softif_free(struct net_device *dev)
1028 {
1029         batadv_debugfs_del_meshif(dev);
1030         batadv_mesh_free(dev);
1031 
1032         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1033          * their tasks. Wait for them all to be finished before freeing the
1034          * netdev and its private data (bat_priv)
1035          */
1036         rcu_barrier();
1037 }
1038 
1039 /**
1040  * batadv_softif_init_early - early stage initialization of soft interface
1041  * @dev: registered network device to modify
1042  */
1043 static void batadv_softif_init_early(struct net_device *dev)
1044 {
1045         ether_setup(dev);
1046 
1047         dev->netdev_ops = &batadv_netdev_ops;
1048         dev->needs_free_netdev = true;
1049         dev->priv_destructor = batadv_softif_free;
1050         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1051         dev->priv_flags |= IFF_NO_QUEUE;
1052 
1053         /* can't call min_mtu, because the needed variables
1054          * have not been initialized yet
1055          */
1056         dev->mtu = ETH_DATA_LEN;
1057 
1058         /* generate random address */
1059         eth_hw_addr_random(dev);
1060 
1061         dev->ethtool_ops = &batadv_ethtool_ops;
1062 }
1063 
1064 struct net_device *batadv_softif_create(struct net *net, const char *name)
1065 {
1066         struct net_device *soft_iface;
1067         int ret;
1068 
1069         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1070                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1071         if (!soft_iface)
1072                 return NULL;
1073 
1074         dev_net_set(soft_iface, net);
1075 
1076         soft_iface->rtnl_link_ops = &batadv_link_ops;
1077 
1078         ret = register_netdevice(soft_iface);
1079         if (ret < 0) {
1080                 pr_err("Unable to register the batman interface '%s': %i\n",
1081                        name, ret);
1082                 free_netdev(soft_iface);
1083                 return NULL;
1084         }
1085 
1086         return soft_iface;
1087 }
1088 
1089 /**
1090  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
1091  * @soft_iface: the to-be-removed batman-adv interface
1092  */
1093 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1094 {
1095         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1096         struct batadv_softif_vlan *vlan;
1097 
1098         ASSERT_RTNL();
1099 
1100         /* destroy the "untagged" VLAN */
1101         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1102         if (vlan) {
1103                 batadv_softif_destroy_vlan(bat_priv, vlan);
1104                 batadv_softif_vlan_put(vlan);
1105         }
1106 
1107         batadv_sysfs_del_meshif(soft_iface);
1108         unregister_netdevice(soft_iface);
1109 }
1110 
1111 /**
1112  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
1113  * @soft_iface: the to-be-removed batman-adv interface
1114  * @head: list pointer
1115  */
1116 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1117                                           struct list_head *head)
1118 {
1119         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1120         struct batadv_hard_iface *hard_iface;
1121         struct batadv_softif_vlan *vlan;
1122 
1123         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1124                 if (hard_iface->soft_iface == soft_iface)
1125                         batadv_hardif_disable_interface(hard_iface,
1126                                                         BATADV_IF_CLEANUP_KEEP);
1127         }
1128 
1129         /* destroy the "untagged" VLAN */
1130         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1131         if (vlan) {
1132                 batadv_softif_destroy_vlan(bat_priv, vlan);
1133                 batadv_softif_vlan_put(vlan);
1134         }
1135 
1136         batadv_sysfs_del_meshif(soft_iface);
1137         unregister_netdevice_queue(soft_iface, head);
1138 }
1139 
1140 bool batadv_softif_is_valid(const struct net_device *net_dev)
1141 {
1142         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1143                 return true;
1144 
1145         return false;
1146 }
1147 
1148 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1149         .kind           = "batadv",
1150         .priv_size      = sizeof(struct batadv_priv),
1151         .setup          = batadv_softif_init_early,
1152         .dellink        = batadv_softif_destroy_netlink,
1153 };
1154 

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