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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) 2007-2017  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 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             !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
263                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
264                                                    vid, skb->skb_iif,
265                                                    skb->mark);
266                 if (!client_added)
267                         goto dropped;
268         }
269 
270         /* don't accept stp packets. STP does not help in meshes.
271          * better use the bridge loop avoidance ...
272          *
273          * The same goes for ECTP sent at least by some Cisco Switches,
274          * it might confuse the mesh when used with bridge loop avoidance.
275          */
276         if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
277                 goto dropped;
278 
279         if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
280                 goto dropped;
281 
282         gw_mode = atomic_read(&bat_priv->gw.mode);
283         if (is_multicast_ether_addr(ethhdr->h_dest)) {
284                 /* if gw mode is off, broadcast every packet */
285                 if (gw_mode == BATADV_GW_MODE_OFF) {
286                         do_bcast = true;
287                         goto send;
288                 }
289 
290                 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
291                                                         chaddr);
292                 /* skb->data may have been modified by
293                  * batadv_gw_dhcp_recipient_get()
294                  */
295                 ethhdr = eth_hdr(skb);
296                 /* if gw_mode is on, broadcast any non-DHCP message.
297                  * All the DHCP packets are going to be sent as unicast
298                  */
299                 if (dhcp_rcp == BATADV_DHCP_NO) {
300                         do_bcast = true;
301                         goto send;
302                 }
303 
304                 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
305                         dst_hint = chaddr;
306                 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
307                          (dhcp_rcp == BATADV_DHCP_TO_SERVER))
308                         /* gateways should not forward any DHCP message if
309                          * directed to a DHCP server
310                          */
311                         goto dropped;
312 
313 send:
314                 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
315                         forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
316                                                            &mcast_single_orig);
317                         if (forw_mode == BATADV_FORW_NONE)
318                                 goto dropped;
319 
320                         if (forw_mode == BATADV_FORW_SINGLE)
321                                 do_bcast = false;
322                 }
323         }
324 
325         batadv_skb_set_priority(skb, 0);
326 
327         /* ethernet packet should be broadcasted */
328         if (do_bcast) {
329                 primary_if = batadv_primary_if_get_selected(bat_priv);
330                 if (!primary_if)
331                         goto dropped;
332 
333                 /* in case of ARP request, we do not immediately broadcasti the
334                  * packet, instead we first wait for DAT to try to retrieve the
335                  * correct ARP entry
336                  */
337                 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
338                         brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
339 
340                 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
341                         goto dropped;
342 
343                 bcast_packet = (struct batadv_bcast_packet *)skb->data;
344                 bcast_packet->version = BATADV_COMPAT_VERSION;
345                 bcast_packet->ttl = BATADV_TTL;
346 
347                 /* batman packet type: broadcast */
348                 bcast_packet->packet_type = BATADV_BCAST;
349                 bcast_packet->reserved = 0;
350 
351                 /* hw address of first interface is the orig mac because only
352                  * this mac is known throughout the mesh
353                  */
354                 ether_addr_copy(bcast_packet->orig,
355                                 primary_if->net_dev->dev_addr);
356 
357                 /* set broadcast sequence number */
358                 seqno = atomic_inc_return(&bat_priv->bcast_seqno);
359                 bcast_packet->seqno = htonl(seqno);
360 
361                 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
362 
363                 /* a copy is stored in the bcast list, therefore removing
364                  * the original skb.
365                  */
366                 consume_skb(skb);
367 
368         /* unicast packet */
369         } else {
370                 /* DHCP packets going to a server will use the GW feature */
371                 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
372                         ret = batadv_gw_out_of_range(bat_priv, skb);
373                         if (ret)
374                                 goto dropped;
375                         ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
376                 } else if (mcast_single_orig) {
377                         ret = batadv_send_skb_unicast(bat_priv, skb,
378                                                       BATADV_UNICAST, 0,
379                                                       mcast_single_orig, vid);
380                 } else {
381                         if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
382                                                                   skb))
383                                 goto dropped;
384 
385                         batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
386 
387                         ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
388                                                      vid);
389                 }
390                 if (ret != NET_XMIT_SUCCESS)
391                         goto dropped_freed;
392         }
393 
394         batadv_inc_counter(bat_priv, BATADV_CNT_TX);
395         batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
396         goto end;
397 
398 dropped:
399         kfree_skb(skb);
400 dropped_freed:
401         batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
402 end:
403         if (mcast_single_orig)
404                 batadv_orig_node_put(mcast_single_orig);
405         if (primary_if)
406                 batadv_hardif_put(primary_if);
407         return NETDEV_TX_OK;
408 }
409 
410 /**
411  * batadv_interface_rx - receive ethernet frame on local batman-adv interface
412  * @soft_iface: local interface which will receive the ethernet frame
413  * @skb: ethernet frame for @soft_iface
414  * @hdr_size: size of already parsed batman-adv header
415  * @orig_node: originator from which the batman-adv packet was sent
416  *
417  * Sends a ethernet frame to the receive path of the local @soft_iface.
418  * skb->data has still point to the batman-adv header with the size @hdr_size.
419  * The caller has to have parsed this header already and made sure that at least
420  * @hdr_size bytes are still available for pull in @skb.
421  *
422  * The packet may still get dropped. This can happen when the encapsulated
423  * ethernet frame is invalid or contains again an batman-adv packet. Also
424  * unicast packets will be dropped directly when it was sent between two
425  * isolated clients.
426  */
427 void batadv_interface_rx(struct net_device *soft_iface,
428                          struct sk_buff *skb, int hdr_size,
429                          struct batadv_orig_node *orig_node)
430 {
431         struct batadv_bcast_packet *batadv_bcast_packet;
432         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
433         struct vlan_ethhdr *vhdr;
434         struct ethhdr *ethhdr;
435         unsigned short vid;
436         bool is_bcast;
437 
438         batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
439         is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
440 
441         skb_pull_rcsum(skb, hdr_size);
442         skb_reset_mac_header(skb);
443 
444         /* clean the netfilter state now that the batman-adv header has been
445          * removed
446          */
447         nf_reset(skb);
448 
449         if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
450                 goto dropped;
451 
452         vid = batadv_get_vid(skb, 0);
453         ethhdr = eth_hdr(skb);
454 
455         switch (ntohs(ethhdr->h_proto)) {
456         case ETH_P_8021Q:
457                 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
458                         goto dropped;
459 
460                 vhdr = (struct vlan_ethhdr *)skb->data;
461 
462                 /* drop batman-in-batman packets to prevent loops */
463                 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
464                         break;
465 
466                 /* fall through */
467         case ETH_P_BATMAN:
468                 goto dropped;
469         }
470 
471         /* skb->dev & skb->pkt_type are set here */
472         skb->protocol = eth_type_trans(skb, soft_iface);
473 
474         /* should not be necessary anymore as we use skb_pull_rcsum()
475          * TODO: please verify this and remove this TODO
476          * -- Dec 21st 2009, Simon Wunderlich
477          */
478 
479         /* skb->ip_summed = CHECKSUM_UNNECESSARY; */
480 
481         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
482         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
483                            skb->len + ETH_HLEN);
484 
485         /* Let the bridge loop avoidance check the packet. If will
486          * not handle it, we can safely push it up.
487          */
488         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
489                 goto out;
490 
491         if (orig_node)
492                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
493                                                      ethhdr->h_source, vid);
494 
495         if (is_multicast_ether_addr(ethhdr->h_dest)) {
496                 /* set the mark on broadcast packets if AP isolation is ON and
497                  * the packet is coming from an "isolated" client
498                  */
499                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
500                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
501                                                  vid)) {
502                         /* save bits in skb->mark not covered by the mask and
503                          * apply the mark on the rest
504                          */
505                         skb->mark &= ~bat_priv->isolation_mark_mask;
506                         skb->mark |= bat_priv->isolation_mark;
507                 }
508         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
509                                          ethhdr->h_dest, vid)) {
510                 goto dropped;
511         }
512 
513         netif_rx(skb);
514         goto out;
515 
516 dropped:
517         kfree_skb(skb);
518 out:
519         return;
520 }
521 
522 /**
523  * batadv_softif_vlan_release - release vlan from lists and queue for free after
524  *  rcu grace period
525  * @ref: kref pointer of the vlan object
526  */
527 static void batadv_softif_vlan_release(struct kref *ref)
528 {
529         struct batadv_softif_vlan *vlan;
530 
531         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
532 
533         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
534         hlist_del_rcu(&vlan->list);
535         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
536 
537         kfree_rcu(vlan, rcu);
538 }
539 
540 /**
541  * batadv_softif_vlan_put - decrease the vlan object refcounter and
542  *  possibly release it
543  * @vlan: the vlan object to release
544  */
545 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
546 {
547         if (!vlan)
548                 return;
549 
550         kref_put(&vlan->refcount, batadv_softif_vlan_release);
551 }
552 
553 /**
554  * batadv_softif_vlan_get - get the vlan object for a specific vid
555  * @bat_priv: the bat priv with all the soft interface information
556  * @vid: the identifier of the vlan object to retrieve
557  *
558  * Return: the private data of the vlan matching the vid passed as argument or
559  * NULL otherwise. The refcounter of the returned object is incremented by 1.
560  */
561 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
562                                                   unsigned short vid)
563 {
564         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
565 
566         rcu_read_lock();
567         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
568                 if (vlan_tmp->vid != vid)
569                         continue;
570 
571                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
572                         continue;
573 
574                 vlan = vlan_tmp;
575                 break;
576         }
577         rcu_read_unlock();
578 
579         return vlan;
580 }
581 
582 /**
583  * batadv_softif_create_vlan - allocate the needed resources for a new vlan
584  * @bat_priv: the bat priv with all the soft interface information
585  * @vid: the VLAN identifier
586  *
587  * Return: 0 on success, a negative error otherwise.
588  */
589 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
590 {
591         struct batadv_softif_vlan *vlan;
592         int err;
593 
594         vlan = batadv_softif_vlan_get(bat_priv, vid);
595         if (vlan) {
596                 batadv_softif_vlan_put(vlan);
597                 return -EEXIST;
598         }
599 
600         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
601         if (!vlan)
602                 return -ENOMEM;
603 
604         vlan->bat_priv = bat_priv;
605         vlan->vid = vid;
606         kref_init(&vlan->refcount);
607 
608         atomic_set(&vlan->ap_isolation, 0);
609 
610         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
611         if (err) {
612                 kfree(vlan);
613                 return err;
614         }
615 
616         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
617         kref_get(&vlan->refcount);
618         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
619         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
620 
621         /* add a new TT local entry. This one will be marked with the NOPURGE
622          * flag
623          */
624         batadv_tt_local_add(bat_priv->soft_iface,
625                             bat_priv->soft_iface->dev_addr, vid,
626                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
627 
628         /* don't return reference to new softif_vlan */
629         batadv_softif_vlan_put(vlan);
630 
631         return 0;
632 }
633 
634 /**
635  * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object
636  * @bat_priv: the bat priv with all the soft interface information
637  * @vlan: the object to remove
638  */
639 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
640                                        struct batadv_softif_vlan *vlan)
641 {
642         /* explicitly remove the associated TT local entry because it is marked
643          * with the NOPURGE flag
644          */
645         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
646                                vlan->vid, "vlan interface destroyed", false);
647 
648         batadv_sysfs_del_vlan(bat_priv, vlan);
649         batadv_softif_vlan_put(vlan);
650 }
651 
652 /**
653  * batadv_interface_add_vid - ndo_add_vid API implementation
654  * @dev: the netdev of the mesh interface
655  * @proto: protocol of the the vlan id
656  * @vid: identifier of the new vlan
657  *
658  * Set up all the internal structures for handling the new vlan on top of the
659  * mesh interface
660  *
661  * Return: 0 on success or a negative error code in case of failure.
662  */
663 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
664                                     unsigned short vid)
665 {
666         struct batadv_priv *bat_priv = netdev_priv(dev);
667         struct batadv_softif_vlan *vlan;
668         int ret;
669 
670         /* only 802.1Q vlans are supported.
671          * batman-adv does not know how to handle other types
672          */
673         if (proto != htons(ETH_P_8021Q))
674                 return -EINVAL;
675 
676         vid |= BATADV_VLAN_HAS_TAG;
677 
678         /* if a new vlan is getting created and it already exists, it means that
679          * it was not deleted yet. batadv_softif_vlan_get() increases the
680          * refcount in order to revive the object.
681          *
682          * if it does not exist then create it.
683          */
684         vlan = batadv_softif_vlan_get(bat_priv, vid);
685         if (!vlan)
686                 return batadv_softif_create_vlan(bat_priv, vid);
687 
688         /* recreate the sysfs object if it was already destroyed (and it should
689          * be since we received a kill_vid() for this vlan
690          */
691         if (!vlan->kobj) {
692                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
693                 if (ret) {
694                         batadv_softif_vlan_put(vlan);
695                         return ret;
696                 }
697         }
698 
699         /* add a new TT local entry. This one will be marked with the NOPURGE
700          * flag. This must be added again, even if the vlan object already
701          * exists, because the entry was deleted by kill_vid()
702          */
703         batadv_tt_local_add(bat_priv->soft_iface,
704                             bat_priv->soft_iface->dev_addr, vid,
705                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
706 
707         return 0;
708 }
709 
710 /**
711  * batadv_interface_kill_vid - ndo_kill_vid API implementation
712  * @dev: the netdev of the mesh interface
713  * @proto: protocol of the the vlan id
714  * @vid: identifier of the deleted vlan
715  *
716  * Destroy all the internal structures used to handle the vlan identified by vid
717  * on top of the mesh interface
718  *
719  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
720  * or -ENOENT if the specified vlan id wasn't registered.
721  */
722 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
723                                      unsigned short vid)
724 {
725         struct batadv_priv *bat_priv = netdev_priv(dev);
726         struct batadv_softif_vlan *vlan;
727 
728         /* only 802.1Q vlans are supported. batman-adv does not know how to
729          * handle other types
730          */
731         if (proto != htons(ETH_P_8021Q))
732                 return -EINVAL;
733 
734         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
735         if (!vlan)
736                 return -ENOENT;
737 
738         batadv_softif_destroy_vlan(bat_priv, vlan);
739 
740         /* finally free the vlan object */
741         batadv_softif_vlan_put(vlan);
742 
743         return 0;
744 }
745 
746 /* batman-adv network devices have devices nesting below it and are a special
747  * "super class" of normal network devices; split their locks off into a
748  * separate class since they always nest.
749  */
750 static struct lock_class_key batadv_netdev_xmit_lock_key;
751 static struct lock_class_key batadv_netdev_addr_lock_key;
752 
753 /**
754  * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue
755  * @dev: device which owns the tx queue
756  * @txq: tx queue to modify
757  * @_unused: always NULL
758  */
759 static void batadv_set_lockdep_class_one(struct net_device *dev,
760                                          struct netdev_queue *txq,
761                                          void *_unused)
762 {
763         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
764 }
765 
766 /**
767  * batadv_set_lockdep_class - Set txq and addr_list lockdep class
768  * @dev: network device to modify
769  */
770 static void batadv_set_lockdep_class(struct net_device *dev)
771 {
772         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
773         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
774 }
775 
776 /**
777  * batadv_softif_init_late - late stage initialization of soft interface
778  * @dev: registered network device to modify
779  *
780  * Return: error code on failures
781  */
782 static int batadv_softif_init_late(struct net_device *dev)
783 {
784         struct batadv_priv *bat_priv;
785         u32 random_seqno;
786         int ret;
787         size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
788 
789         batadv_set_lockdep_class(dev);
790 
791         bat_priv = netdev_priv(dev);
792         bat_priv->soft_iface = dev;
793 
794         /* batadv_interface_stats() needs to be available as soon as
795          * register_netdevice() has been called
796          */
797         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
798         if (!bat_priv->bat_counters)
799                 return -ENOMEM;
800 
801         atomic_set(&bat_priv->aggregated_ogms, 1);
802         atomic_set(&bat_priv->bonding, 0);
803 #ifdef CONFIG_BATMAN_ADV_BLA
804         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
805 #endif
806 #ifdef CONFIG_BATMAN_ADV_DAT
807         atomic_set(&bat_priv->distributed_arp_table, 1);
808 #endif
809 #ifdef CONFIG_BATMAN_ADV_MCAST
810         bat_priv->mcast.querier_ipv4.exists = false;
811         bat_priv->mcast.querier_ipv4.shadowing = false;
812         bat_priv->mcast.querier_ipv6.exists = false;
813         bat_priv->mcast.querier_ipv6.shadowing = false;
814         bat_priv->mcast.flags = BATADV_NO_FLAGS;
815         atomic_set(&bat_priv->multicast_mode, 1);
816         atomic_set(&bat_priv->mcast.num_disabled, 0);
817         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
818         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
819         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
820 #endif
821         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
822         atomic_set(&bat_priv->gw.bandwidth_down, 100);
823         atomic_set(&bat_priv->gw.bandwidth_up, 20);
824         atomic_set(&bat_priv->orig_interval, 1000);
825         atomic_set(&bat_priv->hop_penalty, 30);
826 #ifdef CONFIG_BATMAN_ADV_DEBUG
827         atomic_set(&bat_priv->log_level, 0);
828 #endif
829         atomic_set(&bat_priv->fragmentation, 1);
830         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
831         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
832         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
833 
834         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
835         atomic_set(&bat_priv->bcast_seqno, 1);
836         atomic_set(&bat_priv->tt.vn, 0);
837         atomic_set(&bat_priv->tt.local_changes, 0);
838         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
839 #ifdef CONFIG_BATMAN_ADV_BLA
840         atomic_set(&bat_priv->bla.num_requests, 0);
841 #endif
842         atomic_set(&bat_priv->tp_num, 0);
843 
844         bat_priv->tt.last_changeset = NULL;
845         bat_priv->tt.last_changeset_len = 0;
846         bat_priv->isolation_mark = 0;
847         bat_priv->isolation_mark_mask = 0;
848 
849         /* randomize initial seqno to avoid collision */
850         get_random_bytes(&random_seqno, sizeof(random_seqno));
851         atomic_set(&bat_priv->frag_seqno, random_seqno);
852 
853         bat_priv->primary_if = NULL;
854         bat_priv->num_ifaces = 0;
855 
856         batadv_nc_init_bat_priv(bat_priv);
857 
858         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
859         if (ret < 0)
860                 goto free_bat_counters;
861 
862         ret = batadv_debugfs_add_meshif(dev);
863         if (ret < 0)
864                 goto free_bat_counters;
865 
866         ret = batadv_mesh_init(dev);
867         if (ret < 0)
868                 goto unreg_debugfs;
869 
870         return 0;
871 
872 unreg_debugfs:
873         batadv_debugfs_del_meshif(dev);
874 free_bat_counters:
875         free_percpu(bat_priv->bat_counters);
876         bat_priv->bat_counters = NULL;
877 
878         return ret;
879 }
880 
881 /**
882  * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
883  * @dev: batadv_soft_interface used as master interface
884  * @slave_dev: net_device which should become the slave interface
885  *
886  * Return: 0 if successful or error otherwise.
887  */
888 static int batadv_softif_slave_add(struct net_device *dev,
889                                    struct net_device *slave_dev)
890 {
891         struct batadv_hard_iface *hard_iface;
892         struct net *net = dev_net(dev);
893         int ret = -EINVAL;
894 
895         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
896         if (!hard_iface || hard_iface->soft_iface)
897                 goto out;
898 
899         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
900 
901 out:
902         if (hard_iface)
903                 batadv_hardif_put(hard_iface);
904         return ret;
905 }
906 
907 /**
908  * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
909  * @dev: batadv_soft_interface used as master interface
910  * @slave_dev: net_device which should be removed from the master interface
911  *
912  * Return: 0 if successful or error otherwise.
913  */
914 static int batadv_softif_slave_del(struct net_device *dev,
915                                    struct net_device *slave_dev)
916 {
917         struct batadv_hard_iface *hard_iface;
918         int ret = -EINVAL;
919 
920         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
921 
922         if (!hard_iface || hard_iface->soft_iface != dev)
923                 goto out;
924 
925         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
926         ret = 0;
927 
928 out:
929         if (hard_iface)
930                 batadv_hardif_put(hard_iface);
931         return ret;
932 }
933 
934 static const struct net_device_ops batadv_netdev_ops = {
935         .ndo_init = batadv_softif_init_late,
936         .ndo_open = batadv_interface_open,
937         .ndo_stop = batadv_interface_release,
938         .ndo_get_stats = batadv_interface_stats,
939         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
940         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
941         .ndo_set_mac_address = batadv_interface_set_mac_addr,
942         .ndo_change_mtu = batadv_interface_change_mtu,
943         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
944         .ndo_start_xmit = batadv_interface_tx,
945         .ndo_validate_addr = eth_validate_addr,
946         .ndo_add_slave = batadv_softif_slave_add,
947         .ndo_del_slave = batadv_softif_slave_del,
948 };
949 
950 /**
951  * batadv_softif_free - Deconstructor of batadv_soft_interface
952  * @dev: Device to cleanup and remove
953  */
954 static void batadv_softif_free(struct net_device *dev)
955 {
956         batadv_debugfs_del_meshif(dev);
957         batadv_mesh_free(dev);
958 
959         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
960          * their tasks. Wait for them all to be finished before freeing the
961          * netdev and its private data (bat_priv)
962          */
963         rcu_barrier();
964 }
965 
966 /**
967  * batadv_softif_init_early - early stage initialization of soft interface
968  * @dev: registered network device to modify
969  */
970 static void batadv_softif_init_early(struct net_device *dev)
971 {
972         struct batadv_priv *priv = netdev_priv(dev);
973 
974         ether_setup(dev);
975 
976         dev->netdev_ops = &batadv_netdev_ops;
977         dev->needs_free_netdev = true;
978         dev->priv_destructor = batadv_softif_free;
979         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
980         dev->priv_flags |= IFF_NO_QUEUE;
981 
982         /* can't call min_mtu, because the needed variables
983          * have not been initialized yet
984          */
985         dev->mtu = ETH_DATA_LEN;
986 
987         /* generate random address */
988         eth_hw_addr_random(dev);
989 
990         dev->ethtool_ops = &batadv_ethtool_ops;
991 
992         memset(priv, 0, sizeof(*priv));
993 }
994 
995 struct net_device *batadv_softif_create(struct net *net, const char *name)
996 {
997         struct net_device *soft_iface;
998         int ret;
999 
1000         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1001                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1002         if (!soft_iface)
1003                 return NULL;
1004 
1005         dev_net_set(soft_iface, net);
1006 
1007         soft_iface->rtnl_link_ops = &batadv_link_ops;
1008 
1009         ret = register_netdevice(soft_iface);
1010         if (ret < 0) {
1011                 pr_err("Unable to register the batman interface '%s': %i\n",
1012                        name, ret);
1013                 free_netdev(soft_iface);
1014                 return NULL;
1015         }
1016 
1017         return soft_iface;
1018 }
1019 
1020 /**
1021  * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
1022  * @soft_iface: the to-be-removed batman-adv interface
1023  */
1024 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1025 {
1026         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1027         struct batadv_softif_vlan *vlan;
1028 
1029         ASSERT_RTNL();
1030 
1031         /* destroy the "untagged" VLAN */
1032         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1033         if (vlan) {
1034                 batadv_softif_destroy_vlan(bat_priv, vlan);
1035                 batadv_softif_vlan_put(vlan);
1036         }
1037 
1038         batadv_sysfs_del_meshif(soft_iface);
1039         unregister_netdevice(soft_iface);
1040 }
1041 
1042 /**
1043  * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
1044  * @soft_iface: the to-be-removed batman-adv interface
1045  * @head: list pointer
1046  */
1047 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1048                                           struct list_head *head)
1049 {
1050         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1051         struct batadv_hard_iface *hard_iface;
1052         struct batadv_softif_vlan *vlan;
1053 
1054         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1055                 if (hard_iface->soft_iface == soft_iface)
1056                         batadv_hardif_disable_interface(hard_iface,
1057                                                         BATADV_IF_CLEANUP_KEEP);
1058         }
1059 
1060         /* destroy the "untagged" VLAN */
1061         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1062         if (vlan) {
1063                 batadv_softif_destroy_vlan(bat_priv, vlan);
1064                 batadv_softif_vlan_put(vlan);
1065         }
1066 
1067         batadv_sysfs_del_meshif(soft_iface);
1068         unregister_netdevice_queue(soft_iface, head);
1069 }
1070 
1071 bool batadv_softif_is_valid(const struct net_device *net_dev)
1072 {
1073         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1074                 return true;
1075 
1076         return false;
1077 }
1078 
1079 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1080         .kind           = "batadv",
1081         .priv_size      = sizeof(struct batadv_priv),
1082         .setup          = batadv_softif_init_early,
1083         .dellink        = batadv_softif_destroy_netlink,
1084 };
1085 
1086 /* ethtool */
1087 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1088 {
1089         cmd->supported = 0;
1090         cmd->advertising = 0;
1091         ethtool_cmd_speed_set(cmd, SPEED_10);
1092         cmd->duplex = DUPLEX_FULL;
1093         cmd->port = PORT_TP;
1094         cmd->phy_address = 0;
1095         cmd->transceiver = XCVR_INTERNAL;
1096         cmd->autoneg = AUTONEG_DISABLE;
1097         cmd->maxtxpkt = 0;
1098         cmd->maxrxpkt = 0;
1099 
1100         return 0;
1101 }
1102 
1103 static void batadv_get_drvinfo(struct net_device *dev,
1104                                struct ethtool_drvinfo *info)
1105 {
1106         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
1107         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
1108         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1109         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
1110 }
1111 
1112 static u32 batadv_get_msglevel(struct net_device *dev)
1113 {
1114         return -EOPNOTSUPP;
1115 }
1116 
1117 static void batadv_set_msglevel(struct net_device *dev, u32 value)
1118 {
1119 }
1120 
1121 static u32 batadv_get_link(struct net_device *dev)
1122 {
1123         return 1;
1124 }
1125 
1126 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
1127  * Declare each description string in struct.name[] to get fixed sized buffer
1128  * and compile time checking for strings longer than ETH_GSTRING_LEN.
1129  */
1130 static const struct {
1131         const char name[ETH_GSTRING_LEN];
1132 } batadv_counters_strings[] = {
1133         { "tx" },
1134         { "tx_bytes" },
1135         { "tx_dropped" },
1136         { "rx" },
1137         { "rx_bytes" },
1138         { "forward" },
1139         { "forward_bytes" },
1140         { "mgmt_tx" },
1141         { "mgmt_tx_bytes" },
1142         { "mgmt_rx" },
1143         { "mgmt_rx_bytes" },
1144         { "frag_tx" },
1145         { "frag_tx_bytes" },
1146         { "frag_rx" },
1147         { "frag_rx_bytes" },
1148         { "frag_fwd" },
1149         { "frag_fwd_bytes" },
1150         { "tt_request_tx" },
1151         { "tt_request_rx" },
1152         { "tt_response_tx" },
1153         { "tt_response_rx" },
1154         { "tt_roam_adv_tx" },
1155         { "tt_roam_adv_rx" },
1156 #ifdef CONFIG_BATMAN_ADV_DAT
1157         { "dat_get_tx" },
1158         { "dat_get_rx" },
1159         { "dat_put_tx" },
1160         { "dat_put_rx" },
1161         { "dat_cached_reply_tx" },
1162 #endif
1163 #ifdef CONFIG_BATMAN_ADV_NC
1164         { "nc_code" },
1165         { "nc_code_bytes" },
1166         { "nc_recode" },
1167         { "nc_recode_bytes" },
1168         { "nc_buffer" },
1169         { "nc_decode" },
1170         { "nc_decode_bytes" },
1171         { "nc_decode_failed" },
1172         { "nc_sniffed" },
1173 #endif
1174 };
1175 
1176 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1177 {
1178         if (stringset == ETH_SS_STATS)
1179                 memcpy(data, batadv_counters_strings,
1180                        sizeof(batadv_counters_strings));
1181 }
1182 
1183 static void batadv_get_ethtool_stats(struct net_device *dev,
1184                                      struct ethtool_stats *stats, u64 *data)
1185 {
1186         struct batadv_priv *bat_priv = netdev_priv(dev);
1187         int i;
1188 
1189         for (i = 0; i < BATADV_CNT_NUM; i++)
1190                 data[i] = batadv_sum_counter(bat_priv, i);
1191 }
1192 
1193 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1194 {
1195         if (stringset == ETH_SS_STATS)
1196                 return BATADV_CNT_NUM;
1197 
1198         return -EOPNOTSUPP;
1199 }
1200 

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