1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 */
6
7#include "mesh-interface.h"
8#include "main.h"
9
10#include <linux/atomic.h>
11#include <linux/byteorder/generic.h>
12#include <linux/cache.h>
13#include <linux/compiler.h>
14#include <linux/container_of.h>
15#include <linux/cpumask.h>
16#include <linux/errno.h>
17#include <linux/etherdevice.h>
18#include <linux/ethtool.h>
19#include <linux/gfp.h>
20#include <linux/if_ether.h>
21#include <linux/if_vlan.h>
22#include <linux/jiffies.h>
23#include <linux/kref.h>
24#include <linux/list.h>
25#include <linux/lockdep.h>
26#include <linux/netdevice.h>
27#include <linux/netlink.h>
28#include <linux/percpu.h>
29#include <linux/random.h>
30#include <linux/rculist.h>
31#include <linux/rcupdate.h>
32#include <linux/skbuff.h>
33#include <linux/slab.h>
34#include <linux/socket.h>
35#include <linux/spinlock.h>
36#include <linux/stddef.h>
37#include <linux/string.h>
38#include <linux/types.h>
39#include <net/netlink.h>
40#include <net/rtnetlink.h>
41#include <uapi/linux/batadv_packet.h>
42#include <uapi/linux/batman_adv.h>
43
44#include "bat_algo.h"
45#include "bridge_loop_avoidance.h"
46#include "distributed-arp-table.h"
47#include "gateway_client.h"
48#include "hard-interface.h"
49#include "multicast.h"
50#include "send.h"
51#include "translation-table.h"
52
53/**
54 * batadv_skb_head_push() - Increase header size and move (push) head pointer
55 * @skb: packet buffer which should be modified
56 * @len: number of bytes to add
57 *
58 * Return: 0 on success or negative error number in case of failure
59 */
60int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
61{
62 int result;
63
64 /* TODO: We must check if we can release all references to non-payload
65 * data using __skb_header_release in our skbs to allow skb_cow_header
66 * to work optimally. This means that those skbs are not allowed to read
67 * or write any data which is before the current position of skb->data
68 * after that call and thus allow other skbs with the same data buffer
69 * to write freely in that area.
70 */
71 result = skb_cow_head(skb, headroom: len);
72 if (result < 0)
73 return result;
74
75 skb_push(skb, len);
76 return 0;
77}
78
79/**
80 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
81 * @bat_priv: the bat priv with all the mesh interface information
82 * @idx: index of counter to sum up
83 *
84 * Return: sum of all cpu-local counters
85 */
86static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
87{
88 u64 *counters, sum = 0;
89 int cpu;
90
91 for_each_possible_cpu(cpu) {
92 counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
93 sum += counters[idx];
94 }
95
96 return sum;
97}
98
99static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
100{
101 struct batadv_priv *bat_priv = netdev_priv(dev);
102 struct net_device_stats *stats = &dev->stats;
103
104 stats->tx_packets = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX);
105 stats->tx_bytes = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX_BYTES);
106 stats->tx_dropped = batadv_sum_counter(bat_priv, idx: BATADV_CNT_TX_DROPPED);
107 stats->rx_packets = batadv_sum_counter(bat_priv, idx: BATADV_CNT_RX);
108 stats->rx_bytes = batadv_sum_counter(bat_priv, idx: BATADV_CNT_RX_BYTES);
109 return stats;
110}
111
112static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
113{
114 struct batadv_priv *bat_priv = netdev_priv(dev);
115 struct batadv_meshif_vlan *vlan;
116 struct sockaddr *addr = p;
117 u8 old_addr[ETH_ALEN];
118
119 if (!is_valid_ether_addr(addr: addr->sa_data))
120 return -EADDRNOTAVAIL;
121
122 ether_addr_copy(dst: old_addr, src: dev->dev_addr);
123 eth_hw_addr_set(dev, addr: addr->sa_data);
124
125 /* only modify transtable if it has been initialized before */
126 if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
127 return 0;
128
129 rcu_read_lock();
130 hlist_for_each_entry_rcu(vlan, &bat_priv->meshif_vlan_list, list) {
131 batadv_tt_local_remove(bat_priv, addr: old_addr, vid: vlan->vid,
132 message: "mac address changed", roaming: false);
133 batadv_tt_local_add(mesh_iface: dev, addr: addr->sa_data, vid: vlan->vid,
134 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
135 }
136 rcu_read_unlock();
137
138 return 0;
139}
140
141static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
142{
143 struct batadv_priv *bat_priv = netdev_priv(dev);
144
145 /* check ranges */
146 if (new_mtu < ETH_MIN_MTU || new_mtu > batadv_hardif_min_mtu(mesh_iface: dev))
147 return -EINVAL;
148
149 WRITE_ONCE(dev->mtu, new_mtu);
150 bat_priv->mtu_set_by_user = new_mtu;
151
152 return 0;
153}
154
155/**
156 * batadv_interface_set_rx_mode() - set the rx mode of a device
157 * @dev: registered network device to modify
158 *
159 * We do not actually need to set any rx filters for the virtual batman
160 * mesh interface. However a dummy handler enables a user to set static
161 * multicast listeners for instance.
162 */
163static void batadv_interface_set_rx_mode(struct net_device *dev)
164{
165}
166
167static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
168 struct net_device *mesh_iface)
169{
170 struct ethhdr *ethhdr;
171 struct batadv_priv *bat_priv = netdev_priv(dev: mesh_iface);
172 struct batadv_hard_iface *primary_if = NULL;
173 struct batadv_bcast_packet *bcast_packet;
174 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
175 0x00, 0x00};
176 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
177 0x00, 0x00};
178 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
179 u8 *dst_hint = NULL, chaddr[ETH_ALEN];
180 struct vlan_ethhdr *vhdr;
181 unsigned int header_len = 0;
182 int data_len = skb->len, ret;
183 unsigned long brd_delay = 0;
184 bool do_bcast = false, client_added;
185 unsigned short vid;
186 u32 seqno;
187 int gw_mode;
188 enum batadv_forw_mode forw_mode = BATADV_FORW_BCAST;
189 int mcast_is_routable = 0;
190 int network_offset = ETH_HLEN;
191 __be16 proto;
192
193 if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
194 goto dropped;
195
196 /* reset control block to avoid left overs from previous users */
197 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
198
199 netif_trans_update(dev: mesh_iface);
200 vid = batadv_get_vid(skb, header_len: 0);
201
202 skb_reset_mac_header(skb);
203 ethhdr = eth_hdr(skb);
204
205 proto = ethhdr->h_proto;
206
207 switch (ntohs(proto)) {
208 case ETH_P_8021Q:
209 if (!pskb_may_pull(skb, len: sizeof(*vhdr)))
210 goto dropped;
211 vhdr = vlan_eth_hdr(skb);
212 proto = vhdr->h_vlan_encapsulated_proto;
213
214 /* drop batman-in-batman packets to prevent loops */
215 if (proto != htons(ETH_P_BATMAN)) {
216 network_offset += VLAN_HLEN;
217 break;
218 }
219
220 fallthrough;
221 case ETH_P_BATMAN:
222 goto dropped;
223 }
224
225 skb_set_network_header(skb, offset: network_offset);
226
227 if (batadv_bla_tx(bat_priv, skb, vid))
228 goto dropped;
229
230 /* skb->data might have been reallocated by batadv_bla_tx() */
231 ethhdr = eth_hdr(skb);
232
233 /* Register the client MAC in the transtable */
234 if (!is_multicast_ether_addr(addr: ethhdr->h_source) &&
235 !batadv_bla_is_loopdetect_mac(mac: ethhdr->h_source)) {
236 client_added = batadv_tt_local_add(mesh_iface, addr: ethhdr->h_source,
237 vid, ifindex: skb->skb_iif,
238 mark: skb->mark);
239 if (!client_added)
240 goto dropped;
241 }
242
243 /* Snoop address candidates from DHCPACKs for early DAT filling */
244 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
245
246 /* don't accept stp packets. STP does not help in meshes.
247 * better use the bridge loop avoidance ...
248 *
249 * The same goes for ECTP sent at least by some Cisco Switches,
250 * it might confuse the mesh when used with bridge loop avoidance.
251 */
252 if (batadv_compare_eth(data1: ethhdr->h_dest, data2: stp_addr))
253 goto dropped;
254
255 if (batadv_compare_eth(data1: ethhdr->h_dest, data2: ectp_addr))
256 goto dropped;
257
258 gw_mode = atomic_read(v: &bat_priv->gw.mode);
259 if (is_multicast_ether_addr(addr: ethhdr->h_dest)) {
260 /* if gw mode is off, broadcast every packet */
261 if (gw_mode == BATADV_GW_MODE_OFF) {
262 do_bcast = true;
263 goto send;
264 }
265
266 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, header_len: &header_len,
267 chaddr);
268 /* skb->data may have been modified by
269 * batadv_gw_dhcp_recipient_get()
270 */
271 ethhdr = eth_hdr(skb);
272 /* if gw_mode is on, broadcast any non-DHCP message.
273 * All the DHCP packets are going to be sent as unicast
274 */
275 if (dhcp_rcp == BATADV_DHCP_NO) {
276 do_bcast = true;
277 goto send;
278 }
279
280 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
281 dst_hint = chaddr;
282 else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
283 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
284 /* gateways should not forward any DHCP message if
285 * directed to a DHCP server
286 */
287 goto dropped;
288
289send:
290 if (do_bcast && !is_broadcast_ether_addr(addr: ethhdr->h_dest)) {
291 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, vid,
292 is_routable: &mcast_is_routable);
293 switch (forw_mode) {
294 case BATADV_FORW_BCAST:
295 break;
296 case BATADV_FORW_UCASTS:
297 case BATADV_FORW_MCAST:
298 do_bcast = false;
299 break;
300 case BATADV_FORW_NONE:
301 fallthrough;
302 default:
303 goto dropped;
304 }
305 }
306 }
307
308 batadv_skb_set_priority(skb, offset: 0);
309
310 /* ethernet packet should be broadcasted */
311 if (do_bcast) {
312 primary_if = batadv_primary_if_get_selected(bat_priv);
313 if (!primary_if)
314 goto dropped;
315
316 /* in case of ARP request, we do not immediately broadcasti the
317 * packet, instead we first wait for DAT to try to retrieve the
318 * correct ARP entry
319 */
320 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
321 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
322
323 if (batadv_skb_head_push(skb, len: sizeof(*bcast_packet)) < 0)
324 goto dropped;
325
326 bcast_packet = (struct batadv_bcast_packet *)skb->data;
327 bcast_packet->version = BATADV_COMPAT_VERSION;
328 bcast_packet->ttl = BATADV_TTL - 1;
329
330 /* batman packet type: broadcast */
331 bcast_packet->packet_type = BATADV_BCAST;
332 bcast_packet->reserved = 0;
333
334 /* hw address of first interface is the orig mac because only
335 * this mac is known throughout the mesh
336 */
337 ether_addr_copy(dst: bcast_packet->orig,
338 src: primary_if->net_dev->dev_addr);
339
340 /* set broadcast sequence number */
341 seqno = atomic_inc_return(v: &bat_priv->bcast_seqno);
342 bcast_packet->seqno = htonl(seqno);
343
344 batadv_send_bcast_packet(bat_priv, skb, delay: brd_delay, own_packet: true);
345 /* unicast packet */
346 } else {
347 /* DHCP packets going to a server will use the GW feature */
348 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
349 ret = batadv_gw_out_of_range(bat_priv, skb);
350 if (ret)
351 goto dropped;
352 ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
353 } else if (forw_mode == BATADV_FORW_UCASTS) {
354 ret = batadv_mcast_forw_send(bat_priv, skb, vid,
355 is_routable: mcast_is_routable);
356 } else if (forw_mode == BATADV_FORW_MCAST) {
357 ret = batadv_mcast_forw_mcsend(bat_priv, skb);
358 } else {
359 if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
360 skb))
361 goto dropped;
362
363 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
364
365 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
366 vid);
367 }
368 if (ret != NET_XMIT_SUCCESS)
369 goto dropped_freed;
370 }
371
372 batadv_inc_counter(bat_priv, BATADV_CNT_TX);
373 batadv_add_counter(bat_priv, idx: BATADV_CNT_TX_BYTES, count: data_len);
374 goto end;
375
376dropped:
377 kfree_skb(skb);
378dropped_freed:
379 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
380end:
381 batadv_hardif_put(hard_iface: primary_if);
382 return NETDEV_TX_OK;
383}
384
385/**
386 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
387 * @mesh_iface: local interface which will receive the ethernet frame
388 * @skb: ethernet frame for @mesh_iface
389 * @hdr_size: size of already parsed batman-adv header
390 * @orig_node: originator from which the batman-adv packet was sent
391 *
392 * Sends an ethernet frame to the receive path of the local @mesh_iface.
393 * skb->data has still point to the batman-adv header with the size @hdr_size.
394 * The caller has to have parsed this header already and made sure that at least
395 * @hdr_size bytes are still available for pull in @skb.
396 *
397 * The packet may still get dropped. This can happen when the encapsulated
398 * ethernet frame is invalid or contains again an batman-adv packet. Also
399 * unicast packets will be dropped directly when it was sent between two
400 * isolated clients.
401 */
402void batadv_interface_rx(struct net_device *mesh_iface,
403 struct sk_buff *skb, int hdr_size,
404 struct batadv_orig_node *orig_node)
405{
406 struct batadv_bcast_packet *batadv_bcast_packet;
407 struct batadv_priv *bat_priv = netdev_priv(dev: mesh_iface);
408 struct vlan_ethhdr *vhdr;
409 struct ethhdr *ethhdr;
410 unsigned short vid;
411 int packet_type;
412
413 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
414 packet_type = batadv_bcast_packet->packet_type;
415
416 skb_pull_rcsum(skb, len: hdr_size);
417 skb_reset_mac_header(skb);
418
419 /* clean the netfilter state now that the batman-adv header has been
420 * removed
421 */
422 nf_reset_ct(skb);
423
424 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
425 goto dropped;
426
427 vid = batadv_get_vid(skb, header_len: 0);
428 ethhdr = eth_hdr(skb);
429
430 switch (ntohs(ethhdr->h_proto)) {
431 case ETH_P_8021Q:
432 if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
433 goto dropped;
434
435 vhdr = skb_vlan_eth_hdr(skb);
436
437 /* drop batman-in-batman packets to prevent loops */
438 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
439 break;
440
441 fallthrough;
442 case ETH_P_BATMAN:
443 goto dropped;
444 }
445
446 /* skb->dev & skb->pkt_type are set here */
447 skb->protocol = eth_type_trans(skb, dev: mesh_iface);
448 skb_postpull_rcsum(skb, start: eth_hdr(skb), ETH_HLEN);
449
450 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
451 batadv_add_counter(bat_priv, idx: BATADV_CNT_RX_BYTES,
452 count: skb->len + ETH_HLEN);
453
454 /* Let the bridge loop avoidance check the packet. If will
455 * not handle it, we can safely push it up.
456 */
457 if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
458 goto out;
459
460 if (orig_node)
461 batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
462 addr: ethhdr->h_source, vid);
463
464 if (is_multicast_ether_addr(addr: ethhdr->h_dest)) {
465 /* set the mark on broadcast packets if AP isolation is ON and
466 * the packet is coming from an "isolated" client
467 */
468 if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
469 batadv_tt_global_is_isolated(bat_priv, addr: ethhdr->h_source,
470 vid)) {
471 /* save bits in skb->mark not covered by the mask and
472 * apply the mark on the rest
473 */
474 skb->mark &= ~bat_priv->isolation_mark_mask;
475 skb->mark |= bat_priv->isolation_mark;
476 }
477 } else if (batadv_is_ap_isolated(bat_priv, src: ethhdr->h_source,
478 dst: ethhdr->h_dest, vid)) {
479 goto dropped;
480 }
481
482 netif_rx(skb);
483 goto out;
484
485dropped:
486 kfree_skb(skb);
487out:
488 return;
489}
490
491/**
492 * batadv_meshif_vlan_release() - release vlan from lists and queue for free
493 * after rcu grace period
494 * @ref: kref pointer of the vlan object
495 */
496void batadv_meshif_vlan_release(struct kref *ref)
497{
498 struct batadv_meshif_vlan *vlan;
499
500 vlan = container_of(ref, struct batadv_meshif_vlan, refcount);
501
502 spin_lock_bh(lock: &vlan->bat_priv->meshif_vlan_list_lock);
503 hlist_del_rcu(n: &vlan->list);
504 spin_unlock_bh(lock: &vlan->bat_priv->meshif_vlan_list_lock);
505
506 kfree_rcu(vlan, rcu);
507}
508
509/**
510 * batadv_meshif_vlan_get() - get the vlan object for a specific vid
511 * @bat_priv: the bat priv with all the mesh interface information
512 * @vid: the identifier of the vlan object to retrieve
513 *
514 * Return: the private data of the vlan matching the vid passed as argument or
515 * NULL otherwise. The refcounter of the returned object is incremented by 1.
516 */
517struct batadv_meshif_vlan *batadv_meshif_vlan_get(struct batadv_priv *bat_priv,
518 unsigned short vid)
519{
520 struct batadv_meshif_vlan *vlan_tmp, *vlan = NULL;
521
522 rcu_read_lock();
523 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->meshif_vlan_list, list) {
524 if (vlan_tmp->vid != vid)
525 continue;
526
527 if (!kref_get_unless_zero(kref: &vlan_tmp->refcount))
528 continue;
529
530 vlan = vlan_tmp;
531 break;
532 }
533 rcu_read_unlock();
534
535 return vlan;
536}
537
538/**
539 * batadv_meshif_create_vlan() - allocate the needed resources for a new vlan
540 * @bat_priv: the bat priv with all the mesh interface information
541 * @vid: the VLAN identifier
542 *
543 * Return: 0 on success, a negative error otherwise.
544 */
545int batadv_meshif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
546{
547 struct batadv_meshif_vlan *vlan;
548
549 spin_lock_bh(lock: &bat_priv->meshif_vlan_list_lock);
550
551 vlan = batadv_meshif_vlan_get(bat_priv, vid);
552 if (vlan) {
553 batadv_meshif_vlan_put(vlan);
554 spin_unlock_bh(lock: &bat_priv->meshif_vlan_list_lock);
555 return -EEXIST;
556 }
557
558 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
559 if (!vlan) {
560 spin_unlock_bh(lock: &bat_priv->meshif_vlan_list_lock);
561 return -ENOMEM;
562 }
563
564 vlan->bat_priv = bat_priv;
565 vlan->vid = vid;
566 kref_init(kref: &vlan->refcount);
567
568 atomic_set(v: &vlan->ap_isolation, i: 0);
569
570 kref_get(kref: &vlan->refcount);
571 hlist_add_head_rcu(n: &vlan->list, h: &bat_priv->meshif_vlan_list);
572 spin_unlock_bh(lock: &bat_priv->meshif_vlan_list_lock);
573
574 /* add a new TT local entry. This one will be marked with the NOPURGE
575 * flag
576 */
577 batadv_tt_local_add(mesh_iface: bat_priv->mesh_iface,
578 addr: bat_priv->mesh_iface->dev_addr, vid,
579 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
580
581 /* don't return reference to new meshif_vlan */
582 batadv_meshif_vlan_put(vlan);
583
584 return 0;
585}
586
587/**
588 * batadv_meshif_destroy_vlan() - remove and destroy a meshif_vlan object
589 * @bat_priv: the bat priv with all the mesh interface information
590 * @vlan: the object to remove
591 */
592static void batadv_meshif_destroy_vlan(struct batadv_priv *bat_priv,
593 struct batadv_meshif_vlan *vlan)
594{
595 /* explicitly remove the associated TT local entry because it is marked
596 * with the NOPURGE flag
597 */
598 batadv_tt_local_remove(bat_priv, addr: bat_priv->mesh_iface->dev_addr,
599 vid: vlan->vid, message: "vlan interface destroyed", roaming: false);
600
601 batadv_meshif_vlan_put(vlan);
602}
603
604/**
605 * batadv_interface_add_vid() - ndo_add_vid API implementation
606 * @dev: the netdev of the mesh interface
607 * @proto: protocol of the vlan id
608 * @vid: identifier of the new vlan
609 *
610 * Set up all the internal structures for handling the new vlan on top of the
611 * mesh interface
612 *
613 * Return: 0 on success or a negative error code in case of failure.
614 */
615static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
616 unsigned short vid)
617{
618 struct batadv_priv *bat_priv = netdev_priv(dev);
619 struct batadv_meshif_vlan *vlan;
620
621 /* only 802.1Q vlans are supported.
622 * batman-adv does not know how to handle other types
623 */
624 if (proto != htons(ETH_P_8021Q))
625 return -EINVAL;
626
627 /* VID 0 is only used to indicate "priority tag" frames which only
628 * contain priority information and no VID. No management structures
629 * should be created for this VID and it should be handled like an
630 * untagged frame.
631 */
632 if (vid == 0)
633 return 0;
634
635 vid |= BATADV_VLAN_HAS_TAG;
636
637 /* if a new vlan is getting created and it already exists, it means that
638 * it was not deleted yet. batadv_meshif_vlan_get() increases the
639 * refcount in order to revive the object.
640 *
641 * if it does not exist then create it.
642 */
643 vlan = batadv_meshif_vlan_get(bat_priv, vid);
644 if (!vlan)
645 return batadv_meshif_create_vlan(bat_priv, vid);
646
647 /* add a new TT local entry. This one will be marked with the NOPURGE
648 * flag. This must be added again, even if the vlan object already
649 * exists, because the entry was deleted by kill_vid()
650 */
651 batadv_tt_local_add(mesh_iface: bat_priv->mesh_iface,
652 addr: bat_priv->mesh_iface->dev_addr, vid,
653 BATADV_NULL_IFINDEX, BATADV_NO_MARK);
654
655 return 0;
656}
657
658/**
659 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
660 * @dev: the netdev of the mesh interface
661 * @proto: protocol of the vlan id
662 * @vid: identifier of the deleted vlan
663 *
664 * Destroy all the internal structures used to handle the vlan identified by vid
665 * on top of the mesh interface
666 *
667 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
668 * or -ENOENT if the specified vlan id wasn't registered.
669 */
670static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
671 unsigned short vid)
672{
673 struct batadv_priv *bat_priv = netdev_priv(dev);
674 struct batadv_meshif_vlan *vlan;
675
676 /* only 802.1Q vlans are supported. batman-adv does not know how to
677 * handle other types
678 */
679 if (proto != htons(ETH_P_8021Q))
680 return -EINVAL;
681
682 /* "priority tag" frames are handled like "untagged" frames
683 * and no meshif_vlan needs to be destroyed
684 */
685 if (vid == 0)
686 return 0;
687
688 vlan = batadv_meshif_vlan_get(bat_priv, vid: vid | BATADV_VLAN_HAS_TAG);
689 if (!vlan)
690 return -ENOENT;
691
692 batadv_meshif_destroy_vlan(bat_priv, vlan);
693
694 /* finally free the vlan object */
695 batadv_meshif_vlan_put(vlan);
696
697 return 0;
698}
699
700/* batman-adv network devices have devices nesting below it and are a special
701 * "super class" of normal network devices; split their locks off into a
702 * separate class since they always nest.
703 */
704static struct lock_class_key batadv_netdev_xmit_lock_key;
705static struct lock_class_key batadv_netdev_addr_lock_key;
706
707/**
708 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
709 * @dev: device which owns the tx queue
710 * @txq: tx queue to modify
711 * @_unused: always NULL
712 */
713static void batadv_set_lockdep_class_one(struct net_device *dev,
714 struct netdev_queue *txq,
715 void *_unused)
716{
717 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
718}
719
720/**
721 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
722 * @dev: network device to modify
723 */
724static void batadv_set_lockdep_class(struct net_device *dev)
725{
726 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
727 netdev_for_each_tx_queue(dev, f: batadv_set_lockdep_class_one, NULL);
728}
729
730/**
731 * batadv_meshif_init_late() - late stage initialization of mesh interface
732 * @dev: registered network device to modify
733 *
734 * Return: error code on failures
735 */
736static int batadv_meshif_init_late(struct net_device *dev)
737{
738 struct batadv_priv *bat_priv;
739 u32 random_seqno;
740 int ret;
741 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
742
743 batadv_set_lockdep_class(dev);
744
745 bat_priv = netdev_priv(dev);
746 bat_priv->mesh_iface = dev;
747
748 /* batadv_interface_stats() needs to be available as soon as
749 * register_netdevice() has been called
750 */
751 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
752 if (!bat_priv->bat_counters)
753 return -ENOMEM;
754
755 atomic_set(v: &bat_priv->aggregated_ogms, i: 1);
756 atomic_set(v: &bat_priv->bonding, i: 0);
757#ifdef CONFIG_BATMAN_ADV_BLA
758 atomic_set(v: &bat_priv->bridge_loop_avoidance, i: 1);
759#endif
760#ifdef CONFIG_BATMAN_ADV_DAT
761 atomic_set(v: &bat_priv->distributed_arp_table, i: 1);
762#endif
763#ifdef CONFIG_BATMAN_ADV_MCAST
764 atomic_set(v: &bat_priv->multicast_mode, i: 1);
765 atomic_set(v: &bat_priv->multicast_fanout, i: 16);
766 atomic_set(v: &bat_priv->mcast.num_want_all_unsnoopables, i: 0);
767 atomic_set(v: &bat_priv->mcast.num_want_all_ipv4, i: 0);
768 atomic_set(v: &bat_priv->mcast.num_want_all_ipv6, i: 0);
769 atomic_set(v: &bat_priv->mcast.num_no_mc_ptype_capa, i: 0);
770#endif
771 atomic_set(v: &bat_priv->gw.mode, i: BATADV_GW_MODE_OFF);
772 atomic_set(v: &bat_priv->gw.bandwidth_down, i: 100);
773 atomic_set(v: &bat_priv->gw.bandwidth_up, i: 20);
774 atomic_set(v: &bat_priv->orig_interval, i: 1000);
775 atomic_set(v: &bat_priv->hop_penalty, i: 30);
776#ifdef CONFIG_BATMAN_ADV_DEBUG
777 atomic_set(v: &bat_priv->log_level, i: 0);
778#endif
779 atomic_set(v: &bat_priv->fragmentation, i: 1);
780 atomic_set(v: &bat_priv->packet_size_max, BATADV_MAX_MTU);
781 atomic_set(v: &bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
782 atomic_set(v: &bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
783
784 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE);
785 atomic_set(v: &bat_priv->bcast_seqno, i: 1);
786 atomic_set(v: &bat_priv->tt.vn, i: 0);
787 atomic_set(v: &bat_priv->tt.ogm_append_cnt, i: 0);
788#ifdef CONFIG_BATMAN_ADV_BLA
789 atomic_set(v: &bat_priv->bla.num_requests, i: 0);
790#endif
791 atomic_set(v: &bat_priv->tp_num, i: 0);
792
793 WRITE_ONCE(bat_priv->tt.local_changes, 0);
794 bat_priv->tt.last_changeset = NULL;
795 bat_priv->tt.last_changeset_len = 0;
796 bat_priv->isolation_mark = 0;
797 bat_priv->isolation_mark_mask = 0;
798
799 /* randomize initial seqno to avoid collision */
800 get_random_bytes(buf: &random_seqno, len: sizeof(random_seqno));
801 atomic_set(v: &bat_priv->frag_seqno, i: random_seqno);
802
803 bat_priv->primary_if = NULL;
804
805 if (!bat_priv->algo_ops) {
806 ret = batadv_algo_select(bat_priv, name: batadv_routing_algo);
807 if (ret < 0)
808 goto free_bat_counters;
809 }
810
811 ret = batadv_mesh_init(mesh_iface: dev);
812 if (ret < 0)
813 goto free_bat_counters;
814
815 return 0;
816
817free_bat_counters:
818 free_percpu(pdata: bat_priv->bat_counters);
819 bat_priv->bat_counters = NULL;
820
821 return ret;
822}
823
824/**
825 * batadv_meshif_slave_add() - Add a slave interface to a batadv_mesh_interface
826 * @dev: batadv_mesh_interface used as master interface
827 * @slave_dev: net_device which should become the slave interface
828 * @extack: extended ACK report struct
829 *
830 * Return: 0 if successful or error otherwise.
831 */
832static int batadv_meshif_slave_add(struct net_device *dev,
833 struct net_device *slave_dev,
834 struct netlink_ext_ack *extack)
835{
836 struct batadv_hard_iface *hard_iface;
837 int ret = -EINVAL;
838
839 hard_iface = batadv_hardif_get_by_netdev(net_dev: slave_dev);
840 if (!hard_iface || hard_iface->mesh_iface)
841 goto out;
842
843 ret = batadv_hardif_enable_interface(hard_iface, mesh_iface: dev);
844
845out:
846 batadv_hardif_put(hard_iface);
847 return ret;
848}
849
850/**
851 * batadv_meshif_slave_del() - Delete a slave iface from a batadv_mesh_interface
852 * @dev: batadv_mesh_interface used as master interface
853 * @slave_dev: net_device which should be removed from the master interface
854 *
855 * Return: 0 if successful or error otherwise.
856 */
857static int batadv_meshif_slave_del(struct net_device *dev,
858 struct net_device *slave_dev)
859{
860 struct batadv_hard_iface *hard_iface;
861 int ret = -EINVAL;
862
863 hard_iface = batadv_hardif_get_by_netdev(net_dev: slave_dev);
864
865 if (!hard_iface || hard_iface->mesh_iface != dev)
866 goto out;
867
868 batadv_hardif_disable_interface(hard_iface);
869 ret = 0;
870
871out:
872 batadv_hardif_put(hard_iface);
873 return ret;
874}
875
876static const struct net_device_ops batadv_netdev_ops = {
877 .ndo_init = batadv_meshif_init_late,
878 .ndo_get_stats = batadv_interface_stats,
879 .ndo_vlan_rx_add_vid = batadv_interface_add_vid,
880 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
881 .ndo_set_mac_address = batadv_interface_set_mac_addr,
882 .ndo_change_mtu = batadv_interface_change_mtu,
883 .ndo_set_rx_mode = batadv_interface_set_rx_mode,
884 .ndo_start_xmit = batadv_interface_tx,
885 .ndo_validate_addr = eth_validate_addr,
886 .ndo_add_slave = batadv_meshif_slave_add,
887 .ndo_del_slave = batadv_meshif_slave_del,
888};
889
890static void batadv_get_drvinfo(struct net_device *dev,
891 struct ethtool_drvinfo *info)
892{
893 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
894 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
895 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
896 strscpy(info->bus_info, "batman", sizeof(info->bus_info));
897}
898
899/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
900 * Declare each description string in struct.name[] to get fixed sized buffer
901 * and compile time checking for strings longer than ETH_GSTRING_LEN.
902 */
903static const struct {
904 const char name[ETH_GSTRING_LEN];
905} batadv_counters_strings[] = {
906 { "tx" },
907 { "tx_bytes" },
908 { "tx_dropped" },
909 { "rx" },
910 { "rx_bytes" },
911 { "forward" },
912 { "forward_bytes" },
913 { "mgmt_tx" },
914 { "mgmt_tx_bytes" },
915 { "mgmt_rx" },
916 { "mgmt_rx_bytes" },
917 { "frag_tx" },
918 { "frag_tx_bytes" },
919 { "frag_rx" },
920 { "frag_rx_bytes" },
921 { "frag_fwd" },
922 { "frag_fwd_bytes" },
923 { "tt_request_tx" },
924 { "tt_request_rx" },
925 { "tt_response_tx" },
926 { "tt_response_rx" },
927 { "tt_roam_adv_tx" },
928 { "tt_roam_adv_rx" },
929#ifdef CONFIG_BATMAN_ADV_MCAST
930 { "mcast_tx" },
931 { "mcast_tx_bytes" },
932 { "mcast_tx_local" },
933 { "mcast_tx_local_bytes" },
934 { "mcast_rx" },
935 { "mcast_rx_bytes" },
936 { "mcast_rx_local" },
937 { "mcast_rx_local_bytes" },
938 { "mcast_fwd" },
939 { "mcast_fwd_bytes" },
940#endif
941#ifdef CONFIG_BATMAN_ADV_DAT
942 { "dat_get_tx" },
943 { "dat_get_rx" },
944 { "dat_put_tx" },
945 { "dat_put_rx" },
946 { "dat_cached_reply_tx" },
947#endif
948};
949
950static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
951{
952 if (stringset == ETH_SS_STATS)
953 memcpy(data, batadv_counters_strings,
954 sizeof(batadv_counters_strings));
955}
956
957static void batadv_get_ethtool_stats(struct net_device *dev,
958 struct ethtool_stats *stats, u64 *data)
959{
960 struct batadv_priv *bat_priv = netdev_priv(dev);
961 int i;
962
963 for (i = 0; i < BATADV_CNT_NUM; i++)
964 data[i] = batadv_sum_counter(bat_priv, idx: i);
965}
966
967static int batadv_get_sset_count(struct net_device *dev, int stringset)
968{
969 if (stringset == ETH_SS_STATS)
970 return BATADV_CNT_NUM;
971
972 return -EOPNOTSUPP;
973}
974
975static const struct ethtool_ops batadv_ethtool_ops = {
976 .get_drvinfo = batadv_get_drvinfo,
977 .get_link = ethtool_op_get_link,
978 .get_strings = batadv_get_strings,
979 .get_ethtool_stats = batadv_get_ethtool_stats,
980 .get_sset_count = batadv_get_sset_count,
981};
982
983/**
984 * batadv_meshif_free() - Deconstructor of batadv_mesh_interface
985 * @dev: Device to cleanup and remove
986 */
987static void batadv_meshif_free(struct net_device *dev)
988{
989 batadv_mesh_free(mesh_iface: dev);
990
991 /* some scheduled RCU callbacks need the bat_priv struct to accomplish
992 * their tasks. Wait for them all to be finished before freeing the
993 * netdev and its private data (bat_priv)
994 */
995 rcu_barrier();
996}
997
998/**
999 * batadv_meshif_init_early() - early stage initialization of mesh interface
1000 * @dev: registered network device to modify
1001 */
1002static void batadv_meshif_init_early(struct net_device *dev)
1003{
1004 ether_setup(dev);
1005
1006 dev->netdev_ops = &batadv_netdev_ops;
1007 dev->needs_free_netdev = true;
1008 dev->priv_destructor = batadv_meshif_free;
1009 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1010 dev->priv_flags |= IFF_NO_QUEUE;
1011 dev->lltx = true;
1012 dev->netns_immutable = true;
1013
1014 /* can't call min_mtu, because the needed variables
1015 * have not been initialized yet
1016 */
1017 dev->mtu = ETH_DATA_LEN;
1018 dev->max_mtu = BATADV_MAX_MTU;
1019
1020 /* generate random address */
1021 eth_hw_addr_random(dev);
1022
1023 dev->ethtool_ops = &batadv_ethtool_ops;
1024}
1025
1026/**
1027 * batadv_meshif_validate() - validate configuration of new batadv link
1028 * @tb: IFLA_INFO_DATA netlink attributes
1029 * @data: enum batadv_ifla_attrs attributes
1030 * @extack: extended ACK report struct
1031 *
1032 * Return: 0 if successful or error otherwise.
1033 */
1034static int batadv_meshif_validate(struct nlattr *tb[], struct nlattr *data[],
1035 struct netlink_ext_ack *extack)
1036{
1037 struct batadv_algo_ops *algo_ops;
1038
1039 if (!data)
1040 return 0;
1041
1042 if (data[IFLA_BATADV_ALGO_NAME]) {
1043 algo_ops = batadv_algo_get(name: nla_data(nla: data[IFLA_BATADV_ALGO_NAME]));
1044 if (!algo_ops)
1045 return -EINVAL;
1046 }
1047
1048 return 0;
1049}
1050
1051/**
1052 * batadv_meshif_newlink() - pre-initialize and register new batadv link
1053 * @dev: network device to register
1054 * @params: rtnl newlink parameters
1055 * @extack: extended ACK report struct
1056 *
1057 * Return: 0 if successful or error otherwise.
1058 */
1059static int batadv_meshif_newlink(struct net_device *dev,
1060 struct rtnl_newlink_params *params,
1061 struct netlink_ext_ack *extack)
1062{
1063 struct batadv_priv *bat_priv = netdev_priv(dev);
1064 struct nlattr **data = params->data;
1065 const char *algo_name;
1066 int err;
1067
1068 if (data && data[IFLA_BATADV_ALGO_NAME]) {
1069 algo_name = nla_data(nla: data[IFLA_BATADV_ALGO_NAME]);
1070 err = batadv_algo_select(bat_priv, name: algo_name);
1071 if (err)
1072 return -EINVAL;
1073 }
1074
1075 return register_netdevice(dev);
1076}
1077
1078/**
1079 * batadv_meshif_destroy_netlink() - deletion of batadv_mesh_interface via
1080 * netlink
1081 * @mesh_iface: the to-be-removed batman-adv interface
1082 * @head: list pointer
1083 */
1084static void batadv_meshif_destroy_netlink(struct net_device *mesh_iface,
1085 struct list_head *head)
1086{
1087 struct batadv_priv *bat_priv = netdev_priv(dev: mesh_iface);
1088 struct batadv_hard_iface *hard_iface;
1089 struct batadv_meshif_vlan *vlan;
1090
1091 while (!list_empty(head: &mesh_iface->adj_list.lower)) {
1092 hard_iface = netdev_adjacent_get_private(adj_list: mesh_iface->adj_list.lower.next);
1093 batadv_hardif_disable_interface(hard_iface);
1094 }
1095
1096 /* destroy the "untagged" VLAN */
1097 vlan = batadv_meshif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1098 if (vlan) {
1099 batadv_meshif_destroy_vlan(bat_priv, vlan);
1100 batadv_meshif_vlan_put(vlan);
1101 }
1102
1103 unregister_netdevice_queue(dev: mesh_iface, head);
1104}
1105
1106/**
1107 * batadv_meshif_is_valid() - Check whether device is a batadv mesh interface
1108 * @net_dev: device which should be checked
1109 *
1110 * Return: true when net_dev is a batman-adv interface, false otherwise
1111 */
1112bool batadv_meshif_is_valid(const struct net_device *net_dev)
1113{
1114 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1115 return true;
1116
1117 return false;
1118}
1119
1120static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
1121 [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
1122};
1123
1124struct rtnl_link_ops batadv_link_ops __read_mostly = {
1125 .kind = "batadv",
1126 .priv_size = sizeof(struct batadv_priv),
1127 .setup = batadv_meshif_init_early,
1128 .maxtype = IFLA_BATADV_MAX,
1129 .policy = batadv_ifla_policy,
1130 .validate = batadv_meshif_validate,
1131 .newlink = batadv_meshif_newlink,
1132 .dellink = batadv_meshif_destroy_netlink,
1133};
1134

source code of linux/net/batman-adv/mesh-interface.c