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

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