~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.18 ] ~ [ linux-5.17.9 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.41 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.117 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.195 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.244 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.280 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.315 ] ~ [ 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 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (C) 2007-2019  B.A.T.M.A.N. contributors:
  3  *
  4  * Marek Lindner, Simon Wunderlich
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of version 2 of the GNU General Public
  8  * License as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful, but
 11  * WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 13  * General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include "soft-interface.h"
 20 #include "main.h"
 21 
 22 #include <linux/atomic.h>
 23 #include <linux/byteorder/generic.h>
 24 #include <linux/cache.h>
 25 #include <linux/compiler.h>
 26 #include <linux/cpumask.h>
 27 #include <linux/errno.h>
 28 #include <linux/etherdevice.h>
 29 #include <linux/ethtool.h>
 30 #include <linux/gfp.h>
 31 #include <linux/if_ether.h>
 32 #include <linux/if_vlan.h>
 33 #include <linux/jiffies.h>
 34 #include <linux/kernel.h>
 35 #include <linux/kref.h>
 36 #include <linux/list.h>
 37 #include <linux/lockdep.h>
 38 #include <linux/netdevice.h>
 39 #include <linux/percpu.h>
 40 #include <linux/printk.h>
 41 #include <linux/random.h>
 42 #include <linux/rculist.h>
 43 #include <linux/rcupdate.h>
 44 #include <linux/rtnetlink.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/slab.h>
 47 #include <linux/socket.h>
 48 #include <linux/spinlock.h>
 49 #include <linux/stddef.h>
 50 #include <linux/string.h>
 51 #include <linux/types.h>
 52 #include <uapi/linux/batadv_packet.h>
 53 #include <uapi/linux/batman_adv.h>
 54 
 55 #include "bat_algo.h"
 56 #include "bridge_loop_avoidance.h"
 57 #include "debugfs.h"
 58 #include "distributed-arp-table.h"
 59 #include "gateway_client.h"
 60 #include "hard-interface.h"
 61 #include "multicast.h"
 62 #include "network-coding.h"
 63 #include "originator.h"
 64 #include "send.h"
 65 #include "sysfs.h"
 66 #include "translation-table.h"
 67 
 68 /**
 69  * batadv_skb_head_push() - Increase header size and move (push) head pointer
 70  * @skb: packet buffer which should be modified
 71  * @len: number of bytes to add
 72  *
 73  * Return: 0 on success or negative error number in case of failure
 74  */
 75 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
 76 {
 77         int result;
 78 
 79         /* TODO: We must check if we can release all references to non-payload
 80          * data using __skb_header_release in our skbs to allow skb_cow_header
 81          * to work optimally. This means that those skbs are not allowed to read
 82          * or write any data which is before the current position of skb->data
 83          * after that call and thus allow other skbs with the same data buffer
 84          * to write freely in that area.
 85          */
 86         result = skb_cow_head(skb, len);
 87         if (result < 0)
 88                 return result;
 89 
 90         skb_push(skb, len);
 91         return 0;
 92 }
 93 
 94 static int batadv_interface_open(struct net_device *dev)
 95 {
 96         netif_start_queue(dev);
 97         return 0;
 98 }
 99 
100 static int batadv_interface_release(struct net_device *dev)
101 {
102         netif_stop_queue(dev);
103         return 0;
104 }
105 
106 /**
107  * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
108  * @bat_priv: the bat priv with all the soft interface information
109  * @idx: index of counter to sum up
110  *
111  * Return: sum of all cpu-local counters
112  */
113 static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
114 {
115         u64 *counters, sum = 0;
116         int cpu;
117 
118         for_each_possible_cpu(cpu) {
119                 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
120                 sum += counters[idx];
121         }
122 
123         return sum;
124 }
125 
126 static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
127 {
128         struct batadv_priv *bat_priv = netdev_priv(dev);
129         struct net_device_stats *stats = &dev->stats;
130 
131         stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
132         stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
133         stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
134         stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
135         stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
136         return stats;
137 }
138 
139 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
140 {
141         struct batadv_priv *bat_priv = netdev_priv(dev);
142         struct batadv_softif_vlan *vlan;
143         struct sockaddr *addr = p;
144         u8 old_addr[ETH_ALEN];
145 
146         if (!is_valid_ether_addr(addr->sa_data))
147                 return -EADDRNOTAVAIL;
148 
149         ether_addr_copy(old_addr, dev->dev_addr);
150         ether_addr_copy(dev->dev_addr, addr->sa_data);
151 
152         /* only modify transtable if it has been initialized before */
153         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
154                 return 0;
155 
156         rcu_read_lock();
157         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
158                 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
159                                        "mac address changed", false);
160                 batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
161                                     BATADV_NULL_IFINDEX, BATADV_NO_MARK);
162         }
163         rcu_read_unlock();
164 
165         return 0;
166 }
167 
168 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
169 {
170         /* check ranges */
171         if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
172                 return -EINVAL;
173 
174         dev->mtu = new_mtu;
175 
176         return 0;
177 }
178 
179 /**
180  * batadv_interface_set_rx_mode() - set the rx mode of a device
181  * @dev: registered network device to modify
182  *
183  * We do not actually need to set any rx filters for the virtual batman
184  * soft interface. However a dummy handler enables a user to set static
185  * multicast listeners for instance.
186  */
187 static void batadv_interface_set_rx_mode(struct net_device *dev)
188 {
189 }
190 
191 static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
192                                        struct net_device *soft_iface)
193 {
194         struct ethhdr *ethhdr;
195         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
196         struct batadv_hard_iface *primary_if = NULL;
197         struct batadv_bcast_packet *bcast_packet;
198         static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
199                                               0x00, 0x00};
200         static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
201                                                0x00, 0x00};
202         enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
203         u8 *dst_hint = NULL, chaddr[ETH_ALEN];
204         struct vlan_ethhdr *vhdr;
205         unsigned int header_len = 0;
206         int data_len = skb->len, ret;
207         unsigned long brd_delay = 1;
208         bool do_bcast = false, client_added;
209         unsigned short vid;
210         u32 seqno;
211         int gw_mode;
212         enum batadv_forw_mode forw_mode;
213         struct batadv_orig_node *mcast_single_orig = NULL;
214         int network_offset = ETH_HLEN;
215         __be16 proto;
216 
217         if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
218                 goto dropped;
219 
220         /* reset control block to avoid left overs from previous users */
221         memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
222 
223         netif_trans_update(soft_iface);
224         vid = batadv_get_vid(skb, 0);
225 
226         skb_reset_mac_header(skb);
227         ethhdr = eth_hdr(skb);
228 
229         proto = ethhdr->h_proto;
230 
231         switch (ntohs(proto)) {
232         case ETH_P_8021Q:
233                 if (!pskb_may_pull(skb, sizeof(*vhdr)))
234                         goto dropped;
235                 vhdr = vlan_eth_hdr(skb);
236                 proto = vhdr->h_vlan_encapsulated_proto;
237 
238                 /* drop batman-in-batman packets to prevent loops */
239                 if (proto != htons(ETH_P_BATMAN)) {
240                         network_offset += VLAN_HLEN;
241                         break;
242                 }
243 
244                 /* fall through */
245         case ETH_P_BATMAN:
246                 goto dropped;
247         }
248 
249         skb_set_network_header(skb, network_offset);
250 
251         if (batadv_bla_tx(bat_priv, skb, vid))
252                 goto dropped;
253 
254         /* skb->data might have been reallocated by batadv_bla_tx() */
255         ethhdr = eth_hdr(skb);
256 
257         /* Register the client MAC in the transtable */
258         if (!is_multicast_ether_addr(ethhdr->h_source) &&
259             !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
260                 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
261                                                    vid, skb->skb_iif,
262                                                    skb->mark);
263                 if (!client_added)
264                         goto dropped;
265         }
266 
267         /* Snoop address candidates from DHCPACKs for early DAT filling */
268         batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
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         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
474 
475         batadv_inc_counter(bat_priv, BATADV_CNT_RX);
476         batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
477                            skb->len + ETH_HLEN);
478 
479         /* Let the bridge loop avoidance check the packet. If will
480          * not handle it, we can safely push it up.
481          */
482         if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
483                 goto out;
484 
485         if (orig_node)
486                 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
487                                                      ethhdr->h_source, vid);
488 
489         if (is_multicast_ether_addr(ethhdr->h_dest)) {
490                 /* set the mark on broadcast packets if AP isolation is ON and
491                  * the packet is coming from an "isolated" client
492                  */
493                 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
494                     batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
495                                                  vid)) {
496                         /* save bits in skb->mark not covered by the mask and
497                          * apply the mark on the rest
498                          */
499                         skb->mark &= ~bat_priv->isolation_mark_mask;
500                         skb->mark |= bat_priv->isolation_mark;
501                 }
502         } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
503                                          ethhdr->h_dest, vid)) {
504                 goto dropped;
505         }
506 
507         netif_rx(skb);
508         goto out;
509 
510 dropped:
511         kfree_skb(skb);
512 out:
513         return;
514 }
515 
516 /**
517  * batadv_softif_vlan_release() - release vlan from lists and queue for free
518  *  after rcu grace period
519  * @ref: kref pointer of the vlan object
520  */
521 static void batadv_softif_vlan_release(struct kref *ref)
522 {
523         struct batadv_softif_vlan *vlan;
524 
525         vlan = container_of(ref, struct batadv_softif_vlan, refcount);
526 
527         spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
528         hlist_del_rcu(&vlan->list);
529         spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
530 
531         kfree_rcu(vlan, rcu);
532 }
533 
534 /**
535  * batadv_softif_vlan_put() - decrease the vlan object refcounter and
536  *  possibly release it
537  * @vlan: the vlan object to release
538  */
539 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
540 {
541         if (!vlan)
542                 return;
543 
544         kref_put(&vlan->refcount, batadv_softif_vlan_release);
545 }
546 
547 /**
548  * batadv_softif_vlan_get() - get the vlan object for a specific vid
549  * @bat_priv: the bat priv with all the soft interface information
550  * @vid: the identifier of the vlan object to retrieve
551  *
552  * Return: the private data of the vlan matching the vid passed as argument or
553  * NULL otherwise. The refcounter of the returned object is incremented by 1.
554  */
555 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
556                                                   unsigned short vid)
557 {
558         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
559 
560         rcu_read_lock();
561         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
562                 if (vlan_tmp->vid != vid)
563                         continue;
564 
565                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
566                         continue;
567 
568                 vlan = vlan_tmp;
569                 break;
570         }
571         rcu_read_unlock();
572 
573         return vlan;
574 }
575 
576 /**
577  * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
578  * @bat_priv: the bat priv with all the soft interface information
579  * @vid: the VLAN identifier
580  *
581  * Return: 0 on success, a negative error otherwise.
582  */
583 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
584 {
585         struct batadv_softif_vlan *vlan;
586         int err;
587 
588         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
589 
590         vlan = batadv_softif_vlan_get(bat_priv, vid);
591         if (vlan) {
592                 batadv_softif_vlan_put(vlan);
593                 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
594                 return -EEXIST;
595         }
596 
597         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
598         if (!vlan) {
599                 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
600                 return -ENOMEM;
601         }
602 
603         vlan->bat_priv = bat_priv;
604         vlan->vid = vid;
605         kref_init(&vlan->refcount);
606 
607         atomic_set(&vlan->ap_isolation, 0);
608 
609         kref_get(&vlan->refcount);
610         hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
611         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
612 
613         /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
614          * sleeping behavior of the sysfs functions and the fs_reclaim lock
615          */
616         err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
617         if (err) {
618                 /* ref for the function */
619                 batadv_softif_vlan_put(vlan);
620 
621                 /* ref for the list */
622                 batadv_softif_vlan_put(vlan);
623                 return err;
624         }
625 
626         /* add a new TT local entry. This one will be marked with the NOPURGE
627          * flag
628          */
629         batadv_tt_local_add(bat_priv->soft_iface,
630                             bat_priv->soft_iface->dev_addr, vid,
631                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
632 
633         /* don't return reference to new softif_vlan */
634         batadv_softif_vlan_put(vlan);
635 
636         return 0;
637 }
638 
639 /**
640  * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
641  * @bat_priv: the bat priv with all the soft interface information
642  * @vlan: the object to remove
643  */
644 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
645                                        struct batadv_softif_vlan *vlan)
646 {
647         /* explicitly remove the associated TT local entry because it is marked
648          * with the NOPURGE flag
649          */
650         batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
651                                vlan->vid, "vlan interface destroyed", false);
652 
653         batadv_sysfs_del_vlan(bat_priv, vlan);
654         batadv_softif_vlan_put(vlan);
655 }
656 
657 /**
658  * batadv_interface_add_vid() - ndo_add_vid API implementation
659  * @dev: the netdev of the mesh interface
660  * @proto: protocol of the the vlan id
661  * @vid: identifier of the new vlan
662  *
663  * Set up all the internal structures for handling the new vlan on top of the
664  * mesh interface
665  *
666  * Return: 0 on success or a negative error code in case of failure.
667  */
668 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
669                                     unsigned short vid)
670 {
671         struct batadv_priv *bat_priv = netdev_priv(dev);
672         struct batadv_softif_vlan *vlan;
673         int ret;
674 
675         /* only 802.1Q vlans are supported.
676          * batman-adv does not know how to handle other types
677          */
678         if (proto != htons(ETH_P_8021Q))
679                 return -EINVAL;
680 
681         vid |= BATADV_VLAN_HAS_TAG;
682 
683         /* if a new vlan is getting created and it already exists, it means that
684          * it was not deleted yet. batadv_softif_vlan_get() increases the
685          * refcount in order to revive the object.
686          *
687          * if it does not exist then create it.
688          */
689         vlan = batadv_softif_vlan_get(bat_priv, vid);
690         if (!vlan)
691                 return batadv_softif_create_vlan(bat_priv, vid);
692 
693         /* recreate the sysfs object if it was already destroyed (and it should
694          * be since we received a kill_vid() for this vlan
695          */
696         if (!vlan->kobj) {
697                 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
698                 if (ret) {
699                         batadv_softif_vlan_put(vlan);
700                         return ret;
701                 }
702         }
703 
704         /* add a new TT local entry. This one will be marked with the NOPURGE
705          * flag. This must be added again, even if the vlan object already
706          * exists, because the entry was deleted by kill_vid()
707          */
708         batadv_tt_local_add(bat_priv->soft_iface,
709                             bat_priv->soft_iface->dev_addr, vid,
710                             BATADV_NULL_IFINDEX, BATADV_NO_MARK);
711 
712         return 0;
713 }
714 
715 /**
716  * batadv_interface_kill_vid() - ndo_kill_vid API implementation
717  * @dev: the netdev of the mesh interface
718  * @proto: protocol of the the vlan id
719  * @vid: identifier of the deleted vlan
720  *
721  * Destroy all the internal structures used to handle the vlan identified by vid
722  * on top of the mesh interface
723  *
724  * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
725  * or -ENOENT if the specified vlan id wasn't registered.
726  */
727 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
728                                      unsigned short vid)
729 {
730         struct batadv_priv *bat_priv = netdev_priv(dev);
731         struct batadv_softif_vlan *vlan;
732 
733         /* only 802.1Q vlans are supported. batman-adv does not know how to
734          * handle other types
735          */
736         if (proto != htons(ETH_P_8021Q))
737                 return -EINVAL;
738 
739         vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
740         if (!vlan)
741                 return -ENOENT;
742 
743         batadv_softif_destroy_vlan(bat_priv, vlan);
744 
745         /* finally free the vlan object */
746         batadv_softif_vlan_put(vlan);
747 
748         return 0;
749 }
750 
751 /* batman-adv network devices have devices nesting below it and are a special
752  * "super class" of normal network devices; split their locks off into a
753  * separate class since they always nest.
754  */
755 static struct lock_class_key batadv_netdev_xmit_lock_key;
756 static struct lock_class_key batadv_netdev_addr_lock_key;
757 
758 /**
759  * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
760  * @dev: device which owns the tx queue
761  * @txq: tx queue to modify
762  * @_unused: always NULL
763  */
764 static void batadv_set_lockdep_class_one(struct net_device *dev,
765                                          struct netdev_queue *txq,
766                                          void *_unused)
767 {
768         lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
769 }
770 
771 /**
772  * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
773  * @dev: network device to modify
774  */
775 static void batadv_set_lockdep_class(struct net_device *dev)
776 {
777         lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
778         netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
779 }
780 
781 /**
782  * batadv_softif_init_late() - late stage initialization of soft interface
783  * @dev: registered network device to modify
784  *
785  * Return: error code on failures
786  */
787 static int batadv_softif_init_late(struct net_device *dev)
788 {
789         struct batadv_priv *bat_priv;
790         u32 random_seqno;
791         int ret;
792         size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
793 
794         batadv_set_lockdep_class(dev);
795 
796         bat_priv = netdev_priv(dev);
797         bat_priv->soft_iface = dev;
798 
799         /* batadv_interface_stats() needs to be available as soon as
800          * register_netdevice() has been called
801          */
802         bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
803         if (!bat_priv->bat_counters)
804                 return -ENOMEM;
805 
806         atomic_set(&bat_priv->aggregated_ogms, 1);
807         atomic_set(&bat_priv->bonding, 0);
808 #ifdef CONFIG_BATMAN_ADV_BLA
809         atomic_set(&bat_priv->bridge_loop_avoidance, 1);
810 #endif
811 #ifdef CONFIG_BATMAN_ADV_DAT
812         atomic_set(&bat_priv->distributed_arp_table, 1);
813 #endif
814 #ifdef CONFIG_BATMAN_ADV_MCAST
815         bat_priv->mcast.querier_ipv4.exists = false;
816         bat_priv->mcast.querier_ipv4.shadowing = false;
817         bat_priv->mcast.querier_ipv6.exists = false;
818         bat_priv->mcast.querier_ipv6.shadowing = false;
819         bat_priv->mcast.flags = BATADV_NO_FLAGS;
820         atomic_set(&bat_priv->multicast_mode, 1);
821         atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
822         atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
823         atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
824 #endif
825         atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
826         atomic_set(&bat_priv->gw.bandwidth_down, 100);
827         atomic_set(&bat_priv->gw.bandwidth_up, 20);
828         atomic_set(&bat_priv->orig_interval, 1000);
829         atomic_set(&bat_priv->hop_penalty, 30);
830 #ifdef CONFIG_BATMAN_ADV_DEBUG
831         atomic_set(&bat_priv->log_level, 0);
832 #endif
833         atomic_set(&bat_priv->fragmentation, 1);
834         atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
835         atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
836         atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
837 
838         atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
839         atomic_set(&bat_priv->bcast_seqno, 1);
840         atomic_set(&bat_priv->tt.vn, 0);
841         atomic_set(&bat_priv->tt.local_changes, 0);
842         atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
843 #ifdef CONFIG_BATMAN_ADV_BLA
844         atomic_set(&bat_priv->bla.num_requests, 0);
845 #endif
846         atomic_set(&bat_priv->tp_num, 0);
847 
848         bat_priv->tt.last_changeset = NULL;
849         bat_priv->tt.last_changeset_len = 0;
850         bat_priv->isolation_mark = 0;
851         bat_priv->isolation_mark_mask = 0;
852 
853         /* randomize initial seqno to avoid collision */
854         get_random_bytes(&random_seqno, sizeof(random_seqno));
855         atomic_set(&bat_priv->frag_seqno, random_seqno);
856 
857         bat_priv->primary_if = NULL;
858 
859         batadv_nc_init_bat_priv(bat_priv);
860 
861         ret = batadv_algo_select(bat_priv, batadv_routing_algo);
862         if (ret < 0)
863                 goto free_bat_counters;
864 
865         ret = batadv_debugfs_add_meshif(dev);
866         if (ret < 0)
867                 goto free_bat_counters;
868 
869         ret = batadv_mesh_init(dev);
870         if (ret < 0)
871                 goto unreg_debugfs;
872 
873         return 0;
874 
875 unreg_debugfs:
876         batadv_debugfs_del_meshif(dev);
877 free_bat_counters:
878         free_percpu(bat_priv->bat_counters);
879         bat_priv->bat_counters = NULL;
880 
881         return ret;
882 }
883 
884 /**
885  * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
886  * @dev: batadv_soft_interface used as master interface
887  * @slave_dev: net_device which should become the slave interface
888  * @extack: extended ACK report struct
889  *
890  * Return: 0 if successful or error otherwise.
891  */
892 static int batadv_softif_slave_add(struct net_device *dev,
893                                    struct net_device *slave_dev,
894                                    struct netlink_ext_ack *extack)
895 {
896         struct batadv_hard_iface *hard_iface;
897         struct net *net = dev_net(dev);
898         int ret = -EINVAL;
899 
900         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
901         if (!hard_iface || hard_iface->soft_iface)
902                 goto out;
903 
904         ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
905 
906 out:
907         if (hard_iface)
908                 batadv_hardif_put(hard_iface);
909         return ret;
910 }
911 
912 /**
913  * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
914  * @dev: batadv_soft_interface used as master interface
915  * @slave_dev: net_device which should be removed from the master interface
916  *
917  * Return: 0 if successful or error otherwise.
918  */
919 static int batadv_softif_slave_del(struct net_device *dev,
920                                    struct net_device *slave_dev)
921 {
922         struct batadv_hard_iface *hard_iface;
923         int ret = -EINVAL;
924 
925         hard_iface = batadv_hardif_get_by_netdev(slave_dev);
926 
927         if (!hard_iface || hard_iface->soft_iface != dev)
928                 goto out;
929 
930         batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
931         ret = 0;
932 
933 out:
934         if (hard_iface)
935                 batadv_hardif_put(hard_iface);
936         return ret;
937 }
938 
939 static const struct net_device_ops batadv_netdev_ops = {
940         .ndo_init = batadv_softif_init_late,
941         .ndo_open = batadv_interface_open,
942         .ndo_stop = batadv_interface_release,
943         .ndo_get_stats = batadv_interface_stats,
944         .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
945         .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
946         .ndo_set_mac_address = batadv_interface_set_mac_addr,
947         .ndo_change_mtu = batadv_interface_change_mtu,
948         .ndo_set_rx_mode = batadv_interface_set_rx_mode,
949         .ndo_start_xmit = batadv_interface_tx,
950         .ndo_validate_addr = eth_validate_addr,
951         .ndo_add_slave = batadv_softif_slave_add,
952         .ndo_del_slave = batadv_softif_slave_del,
953 };
954 
955 static void batadv_get_drvinfo(struct net_device *dev,
956                                struct ethtool_drvinfo *info)
957 {
958         strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
959         strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
960         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
961         strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
962 }
963 
964 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
965  * Declare each description string in struct.name[] to get fixed sized buffer
966  * and compile time checking for strings longer than ETH_GSTRING_LEN.
967  */
968 static const struct {
969         const char name[ETH_GSTRING_LEN];
970 } batadv_counters_strings[] = {
971         { "tx" },
972         { "tx_bytes" },
973         { "tx_dropped" },
974         { "rx" },
975         { "rx_bytes" },
976         { "forward" },
977         { "forward_bytes" },
978         { "mgmt_tx" },
979         { "mgmt_tx_bytes" },
980         { "mgmt_rx" },
981         { "mgmt_rx_bytes" },
982         { "frag_tx" },
983         { "frag_tx_bytes" },
984         { "frag_rx" },
985         { "frag_rx_bytes" },
986         { "frag_fwd" },
987         { "frag_fwd_bytes" },
988         { "tt_request_tx" },
989         { "tt_request_rx" },
990         { "tt_response_tx" },
991         { "tt_response_rx" },
992         { "tt_roam_adv_tx" },
993         { "tt_roam_adv_rx" },
994 #ifdef CONFIG_BATMAN_ADV_DAT
995         { "dat_get_tx" },
996         { "dat_get_rx" },
997         { "dat_put_tx" },
998         { "dat_put_rx" },
999         { "dat_cached_reply_tx" },
1000 #endif
1001 #ifdef CONFIG_BATMAN_ADV_NC
1002         { "nc_code" },
1003         { "nc_code_bytes" },
1004         { "nc_recode" },
1005         { "nc_recode_bytes" },
1006         { "nc_buffer" },
1007         { "nc_decode" },
1008         { "nc_decode_bytes" },
1009         { "nc_decode_failed" },
1010         { "nc_sniffed" },
1011 #endif
1012 };
1013 
1014 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1015 {
1016         if (stringset == ETH_SS_STATS)
1017                 memcpy(data, batadv_counters_strings,
1018                        sizeof(batadv_counters_strings));
1019 }
1020 
1021 static void batadv_get_ethtool_stats(struct net_device *dev,
1022                                      struct ethtool_stats *stats, u64 *data)
1023 {
1024         struct batadv_priv *bat_priv = netdev_priv(dev);
1025         int i;
1026 
1027         for (i = 0; i < BATADV_CNT_NUM; i++)
1028                 data[i] = batadv_sum_counter(bat_priv, i);
1029 }
1030 
1031 static int batadv_get_sset_count(struct net_device *dev, int stringset)
1032 {
1033         if (stringset == ETH_SS_STATS)
1034                 return BATADV_CNT_NUM;
1035 
1036         return -EOPNOTSUPP;
1037 }
1038 
1039 static const struct ethtool_ops batadv_ethtool_ops = {
1040         .get_drvinfo = batadv_get_drvinfo,
1041         .get_link = ethtool_op_get_link,
1042         .get_strings = batadv_get_strings,
1043         .get_ethtool_stats = batadv_get_ethtool_stats,
1044         .get_sset_count = batadv_get_sset_count,
1045 };
1046 
1047 /**
1048  * batadv_softif_free() - Deconstructor of batadv_soft_interface
1049  * @dev: Device to cleanup and remove
1050  */
1051 static void batadv_softif_free(struct net_device *dev)
1052 {
1053         batadv_debugfs_del_meshif(dev);
1054         batadv_mesh_free(dev);
1055 
1056         /* some scheduled RCU callbacks need the bat_priv struct to accomplish
1057          * their tasks. Wait for them all to be finished before freeing the
1058          * netdev and its private data (bat_priv)
1059          */
1060         rcu_barrier();
1061 }
1062 
1063 /**
1064  * batadv_softif_init_early() - early stage initialization of soft interface
1065  * @dev: registered network device to modify
1066  */
1067 static void batadv_softif_init_early(struct net_device *dev)
1068 {
1069         ether_setup(dev);
1070 
1071         dev->netdev_ops = &batadv_netdev_ops;
1072         dev->needs_free_netdev = true;
1073         dev->priv_destructor = batadv_softif_free;
1074         dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1075         dev->features |= NETIF_F_LLTX;
1076         dev->priv_flags |= IFF_NO_QUEUE;
1077 
1078         /* can't call min_mtu, because the needed variables
1079          * have not been initialized yet
1080          */
1081         dev->mtu = ETH_DATA_LEN;
1082 
1083         /* generate random address */
1084         eth_hw_addr_random(dev);
1085 
1086         dev->ethtool_ops = &batadv_ethtool_ops;
1087 }
1088 
1089 /**
1090  * batadv_softif_create() - Create and register soft interface
1091  * @net: the applicable net namespace
1092  * @name: name of the new soft interface
1093  *
1094  * Return: newly allocated soft_interface, NULL on errors
1095  */
1096 struct net_device *batadv_softif_create(struct net *net, const char *name)
1097 {
1098         struct net_device *soft_iface;
1099         int ret;
1100 
1101         soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1102                                   NET_NAME_UNKNOWN, batadv_softif_init_early);
1103         if (!soft_iface)
1104                 return NULL;
1105 
1106         dev_net_set(soft_iface, net);
1107 
1108         soft_iface->rtnl_link_ops = &batadv_link_ops;
1109 
1110         ret = register_netdevice(soft_iface);
1111         if (ret < 0) {
1112                 pr_err("Unable to register the batman interface '%s': %i\n",
1113                        name, ret);
1114                 free_netdev(soft_iface);
1115                 return NULL;
1116         }
1117 
1118         return soft_iface;
1119 }
1120 
1121 /**
1122  * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1123  * @soft_iface: the to-be-removed batman-adv interface
1124  */
1125 void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1126 {
1127         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1128         struct batadv_softif_vlan *vlan;
1129 
1130         ASSERT_RTNL();
1131 
1132         /* destroy the "untagged" VLAN */
1133         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1134         if (vlan) {
1135                 batadv_softif_destroy_vlan(bat_priv, vlan);
1136                 batadv_softif_vlan_put(vlan);
1137         }
1138 
1139         batadv_sysfs_del_meshif(soft_iface);
1140         unregister_netdevice(soft_iface);
1141 }
1142 
1143 /**
1144  * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1145  *  netlink
1146  * @soft_iface: the to-be-removed batman-adv interface
1147  * @head: list pointer
1148  */
1149 static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1150                                           struct list_head *head)
1151 {
1152         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1153         struct batadv_hard_iface *hard_iface;
1154         struct batadv_softif_vlan *vlan;
1155 
1156         list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1157                 if (hard_iface->soft_iface == soft_iface)
1158                         batadv_hardif_disable_interface(hard_iface,
1159                                                         BATADV_IF_CLEANUP_KEEP);
1160         }
1161 
1162         /* destroy the "untagged" VLAN */
1163         vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1164         if (vlan) {
1165                 batadv_softif_destroy_vlan(bat_priv, vlan);
1166                 batadv_softif_vlan_put(vlan);
1167         }
1168 
1169         batadv_sysfs_del_meshif(soft_iface);
1170         unregister_netdevice_queue(soft_iface, head);
1171 }
1172 
1173 /**
1174  * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1175  * @net_dev: device which should be checked
1176  *
1177  * Return: true when net_dev is a batman-adv interface, false otherwise
1178  */
1179 bool batadv_softif_is_valid(const struct net_device *net_dev)
1180 {
1181         if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1182                 return true;
1183 
1184         return false;
1185 }
1186 
1187 struct rtnl_link_ops batadv_link_ops __read_mostly = {
1188         .kind           = "batadv",
1189         .priv_size      = sizeof(struct batadv_priv),
1190         .setup          = batadv_softif_init_early,
1191         .dellink        = batadv_softif_destroy_netlink,
1192 };
1193 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp