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/net/batman-adv/soft-interface.c

http://github.com/mirrors/linux
C | 1147 lines | 718 code | 171 blank | 258 comment | 105 complexity | f28881d4d2519e742703b65f94f91f3b MD5 | raw file
   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (C) 2007-2020  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/cpumask.h>
  15#include <linux/errno.h>
  16#include <linux/etherdevice.h>
  17#include <linux/ethtool.h>
  18#include <linux/gfp.h>
  19#include <linux/if_ether.h>
  20#include <linux/if_vlan.h>
  21#include <linux/jiffies.h>
  22#include <linux/kernel.h>
  23#include <linux/kref.h>
  24#include <linux/list.h>
  25#include <linux/netdevice.h>
  26#include <linux/netlink.h>
  27#include <linux/percpu.h>
  28#include <linux/printk.h>
  29#include <linux/random.h>
  30#include <linux/rculist.h>
  31#include <linux/rcupdate.h>
  32#include <linux/rtnetlink.h>
  33#include <linux/skbuff.h>
  34#include <linux/slab.h>
  35#include <linux/socket.h>
  36#include <linux/spinlock.h>
  37#include <linux/stddef.h>
  38#include <linux/string.h>
  39#include <linux/types.h>
  40#include <uapi/linux/batadv_packet.h>
  41#include <uapi/linux/batman_adv.h>
  42
  43#include "bat_algo.h"
  44#include "bridge_loop_avoidance.h"
  45#include "debugfs.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 "originator.h"
  52#include "send.h"
  53#include "sysfs.h"
  54#include "translation-table.h"
  55
  56/**
  57 * batadv_skb_head_push() - Increase header size and move (push) head pointer
  58 * @skb: packet buffer which should be modified
  59 * @len: number of bytes to add
  60 *
  61 * Return: 0 on success or negative error number in case of failure
  62 */
  63int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
  64{
  65	int result;
  66
  67	/* TODO: We must check if we can release all references to non-payload
  68	 * data using __skb_header_release in our skbs to allow skb_cow_header
  69	 * to work optimally. This means that those skbs are not allowed to read
  70	 * or write any data which is before the current position of skb->data
  71	 * after that call and thus allow other skbs with the same data buffer
  72	 * to write freely in that area.
  73	 */
  74	result = skb_cow_head(skb, len);
  75	if (result < 0)
  76		return result;
  77
  78	skb_push(skb, len);
  79	return 0;
  80}
  81
  82static int batadv_interface_open(struct net_device *dev)
  83{
  84	netif_start_queue(dev);
  85	return 0;
  86}
  87
  88static int batadv_interface_release(struct net_device *dev)
  89{
  90	netif_stop_queue(dev);
  91	return 0;
  92}
  93
  94/**
  95 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
  96 * @bat_priv: the bat priv with all the soft interface information
  97 * @idx: index of counter to sum up
  98 *
  99 * Return: sum of all cpu-local counters
 100 */
 101static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
 102{
 103	u64 *counters, sum = 0;
 104	int cpu;
 105
 106	for_each_possible_cpu(cpu) {
 107		counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
 108		sum += counters[idx];
 109	}
 110
 111	return sum;
 112}
 113
 114static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
 115{
 116	struct batadv_priv *bat_priv = netdev_priv(dev);
 117	struct net_device_stats *stats = &dev->stats;
 118
 119	stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
 120	stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
 121	stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 122	stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
 123	stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
 124	return stats;
 125}
 126
 127static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 128{
 129	struct batadv_priv *bat_priv = netdev_priv(dev);
 130	struct batadv_softif_vlan *vlan;
 131	struct sockaddr *addr = p;
 132	u8 old_addr[ETH_ALEN];
 133
 134	if (!is_valid_ether_addr(addr->sa_data))
 135		return -EADDRNOTAVAIL;
 136
 137	ether_addr_copy(old_addr, dev->dev_addr);
 138	ether_addr_copy(dev->dev_addr, addr->sa_data);
 139
 140	/* only modify transtable if it has been initialized before */
 141	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 142		return 0;
 143
 144	rcu_read_lock();
 145	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 146		batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
 147				       "mac address changed", false);
 148		batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
 149				    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 150	}
 151	rcu_read_unlock();
 152
 153	return 0;
 154}
 155
 156static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 157{
 158	/* check ranges */
 159	if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
 160		return -EINVAL;
 161
 162	dev->mtu = new_mtu;
 163
 164	return 0;
 165}
 166
 167/**
 168 * batadv_interface_set_rx_mode() - set the rx mode of a device
 169 * @dev: registered network device to modify
 170 *
 171 * We do not actually need to set any rx filters for the virtual batman
 172 * soft interface. However a dummy handler enables a user to set static
 173 * multicast listeners for instance.
 174 */
 175static void batadv_interface_set_rx_mode(struct net_device *dev)
 176{
 177}
 178
 179static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 180				       struct net_device *soft_iface)
 181{
 182	struct ethhdr *ethhdr;
 183	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 184	struct batadv_hard_iface *primary_if = NULL;
 185	struct batadv_bcast_packet *bcast_packet;
 186	static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 187					      0x00, 0x00};
 188	static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
 189					       0x00, 0x00};
 190	enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
 191	u8 *dst_hint = NULL, chaddr[ETH_ALEN];
 192	struct vlan_ethhdr *vhdr;
 193	unsigned int header_len = 0;
 194	int data_len = skb->len, ret;
 195	unsigned long brd_delay = 1;
 196	bool do_bcast = false, client_added;
 197	unsigned short vid;
 198	u32 seqno;
 199	int gw_mode;
 200	enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE;
 201	struct batadv_orig_node *mcast_single_orig = NULL;
 202	int network_offset = ETH_HLEN;
 203	__be16 proto;
 204
 205	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 206		goto dropped;
 207
 208	/* reset control block to avoid left overs from previous users */
 209	memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
 210
 211	netif_trans_update(soft_iface);
 212	vid = batadv_get_vid(skb, 0);
 213
 214	skb_reset_mac_header(skb);
 215	ethhdr = eth_hdr(skb);
 216
 217	proto = ethhdr->h_proto;
 218
 219	switch (ntohs(proto)) {
 220	case ETH_P_8021Q:
 221		if (!pskb_may_pull(skb, sizeof(*vhdr)))
 222			goto dropped;
 223		vhdr = vlan_eth_hdr(skb);
 224		proto = vhdr->h_vlan_encapsulated_proto;
 225
 226		/* drop batman-in-batman packets to prevent loops */
 227		if (proto != htons(ETH_P_BATMAN)) {
 228			network_offset += VLAN_HLEN;
 229			break;
 230		}
 231
 232		fallthrough;
 233	case ETH_P_BATMAN:
 234		goto dropped;
 235	}
 236
 237	skb_set_network_header(skb, network_offset);
 238
 239	if (batadv_bla_tx(bat_priv, skb, vid))
 240		goto dropped;
 241
 242	/* skb->data might have been reallocated by batadv_bla_tx() */
 243	ethhdr = eth_hdr(skb);
 244
 245	/* Register the client MAC in the transtable */
 246	if (!is_multicast_ether_addr(ethhdr->h_source) &&
 247	    !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
 248		client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
 249						   vid, skb->skb_iif,
 250						   skb->mark);
 251		if (!client_added)
 252			goto dropped;
 253	}
 254
 255	/* Snoop address candidates from DHCPACKs for early DAT filling */
 256	batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
 257
 258	/* don't accept stp packets. STP does not help in meshes.
 259	 * better use the bridge loop avoidance ...
 260	 *
 261	 * The same goes for ECTP sent at least by some Cisco Switches,
 262	 * it might confuse the mesh when used with bridge loop avoidance.
 263	 */
 264	if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
 265		goto dropped;
 266
 267	if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
 268		goto dropped;
 269
 270	gw_mode = atomic_read(&bat_priv->gw.mode);
 271	if (is_multicast_ether_addr(ethhdr->h_dest)) {
 272		/* if gw mode is off, broadcast every packet */
 273		if (gw_mode == BATADV_GW_MODE_OFF) {
 274			do_bcast = true;
 275			goto send;
 276		}
 277
 278		dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
 279							chaddr);
 280		/* skb->data may have been modified by
 281		 * batadv_gw_dhcp_recipient_get()
 282		 */
 283		ethhdr = eth_hdr(skb);
 284		/* if gw_mode is on, broadcast any non-DHCP message.
 285		 * All the DHCP packets are going to be sent as unicast
 286		 */
 287		if (dhcp_rcp == BATADV_DHCP_NO) {
 288			do_bcast = true;
 289			goto send;
 290		}
 291
 292		if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
 293			dst_hint = chaddr;
 294		else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
 295			 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
 296			/* gateways should not forward any DHCP message if
 297			 * directed to a DHCP server
 298			 */
 299			goto dropped;
 300
 301send:
 302		if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
 303			forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
 304							   &mcast_single_orig);
 305			if (forw_mode == BATADV_FORW_NONE)
 306				goto dropped;
 307
 308			if (forw_mode == BATADV_FORW_SINGLE ||
 309			    forw_mode == BATADV_FORW_SOME)
 310				do_bcast = false;
 311		}
 312	}
 313
 314	batadv_skb_set_priority(skb, 0);
 315
 316	/* ethernet packet should be broadcasted */
 317	if (do_bcast) {
 318		primary_if = batadv_primary_if_get_selected(bat_priv);
 319		if (!primary_if)
 320			goto dropped;
 321
 322		/* in case of ARP request, we do not immediately broadcasti the
 323		 * packet, instead we first wait for DAT to try to retrieve the
 324		 * correct ARP entry
 325		 */
 326		if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
 327			brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
 328
 329		if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 330			goto dropped;
 331
 332		bcast_packet = (struct batadv_bcast_packet *)skb->data;
 333		bcast_packet->version = BATADV_COMPAT_VERSION;
 334		bcast_packet->ttl = BATADV_TTL;
 335
 336		/* batman packet type: broadcast */
 337		bcast_packet->packet_type = BATADV_BCAST;
 338		bcast_packet->reserved = 0;
 339
 340		/* hw address of first interface is the orig mac because only
 341		 * this mac is known throughout the mesh
 342		 */
 343		ether_addr_copy(bcast_packet->orig,
 344				primary_if->net_dev->dev_addr);
 345
 346		/* set broadcast sequence number */
 347		seqno = atomic_inc_return(&bat_priv->bcast_seqno);
 348		bcast_packet->seqno = htonl(seqno);
 349
 350		batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
 351
 352		/* a copy is stored in the bcast list, therefore removing
 353		 * the original skb.
 354		 */
 355		consume_skb(skb);
 356
 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 (mcast_single_orig) {
 366			ret = batadv_send_skb_unicast(bat_priv, skb,
 367						      BATADV_UNICAST, 0,
 368						      mcast_single_orig, vid);
 369		} else if (forw_mode == BATADV_FORW_SOME) {
 370			ret = batadv_mcast_forw_send(bat_priv, skb, vid);
 371		} else {
 372			if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 373								  skb))
 374				goto dropped;
 375
 376			batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 377
 378			ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
 379						     vid);
 380		}
 381		if (ret != NET_XMIT_SUCCESS)
 382			goto dropped_freed;
 383	}
 384
 385	batadv_inc_counter(bat_priv, BATADV_CNT_TX);
 386	batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
 387	goto end;
 388
 389dropped:
 390	kfree_skb(skb);
 391dropped_freed:
 392	batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
 393end:
 394	if (mcast_single_orig)
 395		batadv_orig_node_put(mcast_single_orig);
 396	if (primary_if)
 397		batadv_hardif_put(primary_if);
 398	return NETDEV_TX_OK;
 399}
 400
 401/**
 402 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
 403 * @soft_iface: local interface which will receive the ethernet frame
 404 * @skb: ethernet frame for @soft_iface
 405 * @hdr_size: size of already parsed batman-adv header
 406 * @orig_node: originator from which the batman-adv packet was sent
 407 *
 408 * Sends a ethernet frame to the receive path of the local @soft_iface.
 409 * skb->data has still point to the batman-adv header with the size @hdr_size.
 410 * The caller has to have parsed this header already and made sure that at least
 411 * @hdr_size bytes are still available for pull in @skb.
 412 *
 413 * The packet may still get dropped. This can happen when the encapsulated
 414 * ethernet frame is invalid or contains again an batman-adv packet. Also
 415 * unicast packets will be dropped directly when it was sent between two
 416 * isolated clients.
 417 */
 418void batadv_interface_rx(struct net_device *soft_iface,
 419			 struct sk_buff *skb, int hdr_size,
 420			 struct batadv_orig_node *orig_node)
 421{
 422	struct batadv_bcast_packet *batadv_bcast_packet;
 423	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 424	struct vlan_ethhdr *vhdr;
 425	struct ethhdr *ethhdr;
 426	unsigned short vid;
 427	bool is_bcast;
 428
 429	batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 430	is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
 431
 432	skb_pull_rcsum(skb, hdr_size);
 433	skb_reset_mac_header(skb);
 434
 435	/* clean the netfilter state now that the batman-adv header has been
 436	 * removed
 437	 */
 438	nf_reset_ct(skb);
 439
 440	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 441		goto dropped;
 442
 443	vid = batadv_get_vid(skb, 0);
 444	ethhdr = eth_hdr(skb);
 445
 446	switch (ntohs(ethhdr->h_proto)) {
 447	case ETH_P_8021Q:
 448		if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
 449			goto dropped;
 450
 451		vhdr = (struct vlan_ethhdr *)skb->data;
 452
 453		/* drop batman-in-batman packets to prevent loops */
 454		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 455			break;
 456
 457		fallthrough;
 458	case ETH_P_BATMAN:
 459		goto dropped;
 460	}
 461
 462	/* skb->dev & skb->pkt_type are set here */
 463	skb->protocol = eth_type_trans(skb, soft_iface);
 464	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 465
 466	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 467	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 468			   skb->len + ETH_HLEN);
 469
 470	/* Let the bridge loop avoidance check the packet. If will
 471	 * not handle it, we can safely push it up.
 472	 */
 473	if (batadv_bla_rx(bat_priv, skb, vid, is_bcast))
 474		goto out;
 475
 476	if (orig_node)
 477		batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
 478						     ethhdr->h_source, vid);
 479
 480	if (is_multicast_ether_addr(ethhdr->h_dest)) {
 481		/* set the mark on broadcast packets if AP isolation is ON and
 482		 * the packet is coming from an "isolated" client
 483		 */
 484		if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
 485		    batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
 486						 vid)) {
 487			/* save bits in skb->mark not covered by the mask and
 488			 * apply the mark on the rest
 489			 */
 490			skb->mark &= ~bat_priv->isolation_mark_mask;
 491			skb->mark |= bat_priv->isolation_mark;
 492		}
 493	} else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
 494					 ethhdr->h_dest, vid)) {
 495		goto dropped;
 496	}
 497
 498	netif_rx(skb);
 499	goto out;
 500
 501dropped:
 502	kfree_skb(skb);
 503out:
 504	return;
 505}
 506
 507/**
 508 * batadv_softif_vlan_release() - release vlan from lists and queue for free
 509 *  after rcu grace period
 510 * @ref: kref pointer of the vlan object
 511 */
 512static void batadv_softif_vlan_release(struct kref *ref)
 513{
 514	struct batadv_softif_vlan *vlan;
 515
 516	vlan = container_of(ref, struct batadv_softif_vlan, refcount);
 517
 518	spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 519	hlist_del_rcu(&vlan->list);
 520	spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
 521
 522	kfree_rcu(vlan, rcu);
 523}
 524
 525/**
 526 * batadv_softif_vlan_put() - decrease the vlan object refcounter and
 527 *  possibly release it
 528 * @vlan: the vlan object to release
 529 */
 530void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
 531{
 532	if (!vlan)
 533		return;
 534
 535	kref_put(&vlan->refcount, batadv_softif_vlan_release);
 536}
 537
 538/**
 539 * batadv_softif_vlan_get() - get the vlan object for a specific vid
 540 * @bat_priv: the bat priv with all the soft interface information
 541 * @vid: the identifier of the vlan object to retrieve
 542 *
 543 * Return: the private data of the vlan matching the vid passed as argument or
 544 * NULL otherwise. The refcounter of the returned object is incremented by 1.
 545 */
 546struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
 547						  unsigned short vid)
 548{
 549	struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 550
 551	rcu_read_lock();
 552	hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 553		if (vlan_tmp->vid != vid)
 554			continue;
 555
 556		if (!kref_get_unless_zero(&vlan_tmp->refcount))
 557			continue;
 558
 559		vlan = vlan_tmp;
 560		break;
 561	}
 562	rcu_read_unlock();
 563
 564	return vlan;
 565}
 566
 567/**
 568 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
 569 * @bat_priv: the bat priv with all the soft interface information
 570 * @vid: the VLAN identifier
 571 *
 572 * Return: 0 on success, a negative error otherwise.
 573 */
 574int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
 575{
 576	struct batadv_softif_vlan *vlan;
 577	int err;
 578
 579	spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 580
 581	vlan = batadv_softif_vlan_get(bat_priv, vid);
 582	if (vlan) {
 583		batadv_softif_vlan_put(vlan);
 584		spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 585		return -EEXIST;
 586	}
 587
 588	vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 589	if (!vlan) {
 590		spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 591		return -ENOMEM;
 592	}
 593
 594	vlan->bat_priv = bat_priv;
 595	vlan->vid = vid;
 596	kref_init(&vlan->refcount);
 597
 598	atomic_set(&vlan->ap_isolation, 0);
 599
 600	kref_get(&vlan->refcount);
 601	hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
 602	spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 603
 604	/* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
 605	 * sleeping behavior of the sysfs functions and the fs_reclaim lock
 606	 */
 607	err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 608	if (err) {
 609		/* ref for the function */
 610		batadv_softif_vlan_put(vlan);
 611
 612		/* ref for the list */
 613		batadv_softif_vlan_put(vlan);
 614		return err;
 615	}
 616
 617	/* add a new TT local entry. This one will be marked with the NOPURGE
 618	 * flag
 619	 */
 620	batadv_tt_local_add(bat_priv->soft_iface,
 621			    bat_priv->soft_iface->dev_addr, vid,
 622			    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 623
 624	/* don't return reference to new softif_vlan */
 625	batadv_softif_vlan_put(vlan);
 626
 627	return 0;
 628}
 629
 630/**
 631 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
 632 * @bat_priv: the bat priv with all the soft interface information
 633 * @vlan: the object to remove
 634 */
 635static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
 636				       struct batadv_softif_vlan *vlan)
 637{
 638	/* explicitly remove the associated TT local entry because it is marked
 639	 * with the NOPURGE flag
 640	 */
 641	batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
 642			       vlan->vid, "vlan interface destroyed", false);
 643
 644	batadv_sysfs_del_vlan(bat_priv, vlan);
 645	batadv_softif_vlan_put(vlan);
 646}
 647
 648/**
 649 * batadv_interface_add_vid() - ndo_add_vid API implementation
 650 * @dev: the netdev of the mesh interface
 651 * @proto: protocol of the the vlan id
 652 * @vid: identifier of the new vlan
 653 *
 654 * Set up all the internal structures for handling the new vlan on top of the
 655 * mesh interface
 656 *
 657 * Return: 0 on success or a negative error code in case of failure.
 658 */
 659static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
 660				    unsigned short vid)
 661{
 662	struct batadv_priv *bat_priv = netdev_priv(dev);
 663	struct batadv_softif_vlan *vlan;
 664	int ret;
 665
 666	/* only 802.1Q vlans are supported.
 667	 * batman-adv does not know how to handle other types
 668	 */
 669	if (proto != htons(ETH_P_8021Q))
 670		return -EINVAL;
 671
 672	vid |= BATADV_VLAN_HAS_TAG;
 673
 674	/* if a new vlan is getting created and it already exists, it means that
 675	 * it was not deleted yet. batadv_softif_vlan_get() increases the
 676	 * refcount in order to revive the object.
 677	 *
 678	 * if it does not exist then create it.
 679	 */
 680	vlan = batadv_softif_vlan_get(bat_priv, vid);
 681	if (!vlan)
 682		return batadv_softif_create_vlan(bat_priv, vid);
 683
 684	/* recreate the sysfs object if it was already destroyed (and it should
 685	 * be since we received a kill_vid() for this vlan
 686	 */
 687	if (!vlan->kobj) {
 688		ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
 689		if (ret) {
 690			batadv_softif_vlan_put(vlan);
 691			return ret;
 692		}
 693	}
 694
 695	/* add a new TT local entry. This one will be marked with the NOPURGE
 696	 * flag. This must be added again, even if the vlan object already
 697	 * exists, because the entry was deleted by kill_vid()
 698	 */
 699	batadv_tt_local_add(bat_priv->soft_iface,
 700			    bat_priv->soft_iface->dev_addr, vid,
 701			    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
 702
 703	return 0;
 704}
 705
 706/**
 707 * batadv_interface_kill_vid() - ndo_kill_vid API implementation
 708 * @dev: the netdev of the mesh interface
 709 * @proto: protocol of the the vlan id
 710 * @vid: identifier of the deleted vlan
 711 *
 712 * Destroy all the internal structures used to handle the vlan identified by vid
 713 * on top of the mesh interface
 714 *
 715 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
 716 * or -ENOENT if the specified vlan id wasn't registered.
 717 */
 718static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
 719				     unsigned short vid)
 720{
 721	struct batadv_priv *bat_priv = netdev_priv(dev);
 722	struct batadv_softif_vlan *vlan;
 723
 724	/* only 802.1Q vlans are supported. batman-adv does not know how to
 725	 * handle other types
 726	 */
 727	if (proto != htons(ETH_P_8021Q))
 728		return -EINVAL;
 729
 730	vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
 731	if (!vlan)
 732		return -ENOENT;
 733
 734	batadv_softif_destroy_vlan(bat_priv, vlan);
 735
 736	/* finally free the vlan object */
 737	batadv_softif_vlan_put(vlan);
 738
 739	return 0;
 740}
 741
 742/**
 743 * batadv_softif_init_late() - late stage initialization of soft interface
 744 * @dev: registered network device to modify
 745 *
 746 * Return: error code on failures
 747 */
 748static int batadv_softif_init_late(struct net_device *dev)
 749{
 750	struct batadv_priv *bat_priv;
 751	u32 random_seqno;
 752	int ret;
 753	size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
 754
 755	bat_priv = netdev_priv(dev);
 756	bat_priv->soft_iface = dev;
 757
 758	/* batadv_interface_stats() needs to be available as soon as
 759	 * register_netdevice() has been called
 760	 */
 761	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
 762	if (!bat_priv->bat_counters)
 763		return -ENOMEM;
 764
 765	atomic_set(&bat_priv->aggregated_ogms, 1);
 766	atomic_set(&bat_priv->bonding, 0);
 767#ifdef CONFIG_BATMAN_ADV_BLA
 768	atomic_set(&bat_priv->bridge_loop_avoidance, 1);
 769#endif
 770#ifdef CONFIG_BATMAN_ADV_DAT
 771	atomic_set(&bat_priv->distributed_arp_table, 1);
 772#endif
 773#ifdef CONFIG_BATMAN_ADV_MCAST
 774	atomic_set(&bat_priv->multicast_mode, 1);
 775	atomic_set(&bat_priv->multicast_fanout, 16);
 776	atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 777	atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
 778	atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 779#endif
 780	atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
 781	atomic_set(&bat_priv->gw.bandwidth_down, 100);
 782	atomic_set(&bat_priv->gw.bandwidth_up, 20);
 783	atomic_set(&bat_priv->orig_interval, 1000);
 784	atomic_set(&bat_priv->hop_penalty, 30);
 785#ifdef CONFIG_BATMAN_ADV_DEBUG
 786	atomic_set(&bat_priv->log_level, 0);
 787#endif
 788	atomic_set(&bat_priv->fragmentation, 1);
 789	atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
 790	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
 791	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
 792
 793	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 794	atomic_set(&bat_priv->bcast_seqno, 1);
 795	atomic_set(&bat_priv->tt.vn, 0);
 796	atomic_set(&bat_priv->tt.local_changes, 0);
 797	atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
 798#ifdef CONFIG_BATMAN_ADV_BLA
 799	atomic_set(&bat_priv->bla.num_requests, 0);
 800#endif
 801	atomic_set(&bat_priv->tp_num, 0);
 802
 803	bat_priv->tt.last_changeset = NULL;
 804	bat_priv->tt.last_changeset_len = 0;
 805	bat_priv->isolation_mark = 0;
 806	bat_priv->isolation_mark_mask = 0;
 807
 808	/* randomize initial seqno to avoid collision */
 809	get_random_bytes(&random_seqno, sizeof(random_seqno));
 810	atomic_set(&bat_priv->frag_seqno, random_seqno);
 811
 812	bat_priv->primary_if = NULL;
 813
 814	batadv_nc_init_bat_priv(bat_priv);
 815
 816	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 817	if (ret < 0)
 818		goto free_bat_counters;
 819
 820	ret = batadv_debugfs_add_meshif(dev);
 821	if (ret < 0)
 822		goto free_bat_counters;
 823
 824	ret = batadv_mesh_init(dev);
 825	if (ret < 0)
 826		goto unreg_debugfs;
 827
 828	return 0;
 829
 830unreg_debugfs:
 831	batadv_debugfs_del_meshif(dev);
 832free_bat_counters:
 833	free_percpu(bat_priv->bat_counters);
 834	bat_priv->bat_counters = NULL;
 835
 836	return ret;
 837}
 838
 839/**
 840 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface
 841 * @dev: batadv_soft_interface used as master interface
 842 * @slave_dev: net_device which should become the slave interface
 843 * @extack: extended ACK report struct
 844 *
 845 * Return: 0 if successful or error otherwise.
 846 */
 847static int batadv_softif_slave_add(struct net_device *dev,
 848				   struct net_device *slave_dev,
 849				   struct netlink_ext_ack *extack)
 850{
 851	struct batadv_hard_iface *hard_iface;
 852	struct net *net = dev_net(dev);
 853	int ret = -EINVAL;
 854
 855	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 856	if (!hard_iface || hard_iface->soft_iface)
 857		goto out;
 858
 859	ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
 860
 861out:
 862	if (hard_iface)
 863		batadv_hardif_put(hard_iface);
 864	return ret;
 865}
 866
 867/**
 868 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface
 869 * @dev: batadv_soft_interface used as master interface
 870 * @slave_dev: net_device which should be removed from the master interface
 871 *
 872 * Return: 0 if successful or error otherwise.
 873 */
 874static int batadv_softif_slave_del(struct net_device *dev,
 875				   struct net_device *slave_dev)
 876{
 877	struct batadv_hard_iface *hard_iface;
 878	int ret = -EINVAL;
 879
 880	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 881
 882	if (!hard_iface || hard_iface->soft_iface != dev)
 883		goto out;
 884
 885	batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
 886	ret = 0;
 887
 888out:
 889	if (hard_iface)
 890		batadv_hardif_put(hard_iface);
 891	return ret;
 892}
 893
 894static const struct net_device_ops batadv_netdev_ops = {
 895	.ndo_init = batadv_softif_init_late,
 896	.ndo_open = batadv_interface_open,
 897	.ndo_stop = batadv_interface_release,
 898	.ndo_get_stats = batadv_interface_stats,
 899	.ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 900	.ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 901	.ndo_set_mac_address = batadv_interface_set_mac_addr,
 902	.ndo_change_mtu = batadv_interface_change_mtu,
 903	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
 904	.ndo_start_xmit = batadv_interface_tx,
 905	.ndo_validate_addr = eth_validate_addr,
 906	.ndo_add_slave = batadv_softif_slave_add,
 907	.ndo_del_slave = batadv_softif_slave_del,
 908};
 909
 910static void batadv_get_drvinfo(struct net_device *dev,
 911			       struct ethtool_drvinfo *info)
 912{
 913	strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
 914	strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
 915	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 916	strscpy(info->bus_info, "batman", sizeof(info->bus_info));
 917}
 918
 919/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
 920 * Declare each description string in struct.name[] to get fixed sized buffer
 921 * and compile time checking for strings longer than ETH_GSTRING_LEN.
 922 */
 923static const struct {
 924	const char name[ETH_GSTRING_LEN];
 925} batadv_counters_strings[] = {
 926	{ "tx" },
 927	{ "tx_bytes" },
 928	{ "tx_dropped" },
 929	{ "rx" },
 930	{ "rx_bytes" },
 931	{ "forward" },
 932	{ "forward_bytes" },
 933	{ "mgmt_tx" },
 934	{ "mgmt_tx_bytes" },
 935	{ "mgmt_rx" },
 936	{ "mgmt_rx_bytes" },
 937	{ "frag_tx" },
 938	{ "frag_tx_bytes" },
 939	{ "frag_rx" },
 940	{ "frag_rx_bytes" },
 941	{ "frag_fwd" },
 942	{ "frag_fwd_bytes" },
 943	{ "tt_request_tx" },
 944	{ "tt_request_rx" },
 945	{ "tt_response_tx" },
 946	{ "tt_response_rx" },
 947	{ "tt_roam_adv_tx" },
 948	{ "tt_roam_adv_rx" },
 949#ifdef CONFIG_BATMAN_ADV_DAT
 950	{ "dat_get_tx" },
 951	{ "dat_get_rx" },
 952	{ "dat_put_tx" },
 953	{ "dat_put_rx" },
 954	{ "dat_cached_reply_tx" },
 955#endif
 956#ifdef CONFIG_BATMAN_ADV_NC
 957	{ "nc_code" },
 958	{ "nc_code_bytes" },
 959	{ "nc_recode" },
 960	{ "nc_recode_bytes" },
 961	{ "nc_buffer" },
 962	{ "nc_decode" },
 963	{ "nc_decode_bytes" },
 964	{ "nc_decode_failed" },
 965	{ "nc_sniffed" },
 966#endif
 967};
 968
 969static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 970{
 971	if (stringset == ETH_SS_STATS)
 972		memcpy(data, batadv_counters_strings,
 973		       sizeof(batadv_counters_strings));
 974}
 975
 976static void batadv_get_ethtool_stats(struct net_device *dev,
 977				     struct ethtool_stats *stats, u64 *data)
 978{
 979	struct batadv_priv *bat_priv = netdev_priv(dev);
 980	int i;
 981
 982	for (i = 0; i < BATADV_CNT_NUM; i++)
 983		data[i] = batadv_sum_counter(bat_priv, i);
 984}
 985
 986static int batadv_get_sset_count(struct net_device *dev, int stringset)
 987{
 988	if (stringset == ETH_SS_STATS)
 989		return BATADV_CNT_NUM;
 990
 991	return -EOPNOTSUPP;
 992}
 993
 994static const struct ethtool_ops batadv_ethtool_ops = {
 995	.get_drvinfo = batadv_get_drvinfo,
 996	.get_link = ethtool_op_get_link,
 997	.get_strings = batadv_get_strings,
 998	.get_ethtool_stats = batadv_get_ethtool_stats,
 999	.get_sset_count = batadv_get_sset_count,
1000};
1001
1002/**
1003 * batadv_softif_free() - Deconstructor of batadv_soft_interface
1004 * @dev: Device to cleanup and remove
1005 */
1006static void batadv_softif_free(struct net_device *dev)
1007{
1008	batadv_debugfs_del_meshif(dev);
1009	batadv_mesh_free(dev);
1010
1011	/* some scheduled RCU callbacks need the bat_priv struct to accomplish
1012	 * their tasks. Wait for them all to be finished before freeing the
1013	 * netdev and its private data (bat_priv)
1014	 */
1015	rcu_barrier();
1016}
1017
1018/**
1019 * batadv_softif_init_early() - early stage initialization of soft interface
1020 * @dev: registered network device to modify
1021 */
1022static void batadv_softif_init_early(struct net_device *dev)
1023{
1024	ether_setup(dev);
1025
1026	dev->netdev_ops = &batadv_netdev_ops;
1027	dev->needs_free_netdev = true;
1028	dev->priv_destructor = batadv_softif_free;
1029	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
1030	dev->features |= NETIF_F_LLTX;
1031	dev->priv_flags |= IFF_NO_QUEUE;
1032
1033	/* can't call min_mtu, because the needed variables
1034	 * have not been initialized yet
1035	 */
1036	dev->mtu = ETH_DATA_LEN;
1037
1038	/* generate random address */
1039	eth_hw_addr_random(dev);
1040
1041	dev->ethtool_ops = &batadv_ethtool_ops;
1042}
1043
1044/**
1045 * batadv_softif_create() - Create and register soft interface
1046 * @net: the applicable net namespace
1047 * @name: name of the new soft interface
1048 *
1049 * Return: newly allocated soft_interface, NULL on errors
1050 */
1051struct net_device *batadv_softif_create(struct net *net, const char *name)
1052{
1053	struct net_device *soft_iface;
1054	int ret;
1055
1056	soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
1057				  NET_NAME_UNKNOWN, batadv_softif_init_early);
1058	if (!soft_iface)
1059		return NULL;
1060
1061	dev_net_set(soft_iface, net);
1062
1063	soft_iface->rtnl_link_ops = &batadv_link_ops;
1064
1065	ret = register_netdevice(soft_iface);
1066	if (ret < 0) {
1067		pr_err("Unable to register the batman interface '%s': %i\n",
1068		       name, ret);
1069		free_netdev(soft_iface);
1070		return NULL;
1071	}
1072
1073	return soft_iface;
1074}
1075
1076/**
1077 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs
1078 * @soft_iface: the to-be-removed batman-adv interface
1079 */
1080void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
1081{
1082	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1083	struct batadv_softif_vlan *vlan;
1084
1085	ASSERT_RTNL();
1086
1087	/* destroy the "untagged" VLAN */
1088	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1089	if (vlan) {
1090		batadv_softif_destroy_vlan(bat_priv, vlan);
1091		batadv_softif_vlan_put(vlan);
1092	}
1093
1094	batadv_sysfs_del_meshif(soft_iface);
1095	unregister_netdevice(soft_iface);
1096}
1097
1098/**
1099 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via
1100 *  netlink
1101 * @soft_iface: the to-be-removed batman-adv interface
1102 * @head: list pointer
1103 */
1104static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
1105					  struct list_head *head)
1106{
1107	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
1108	struct batadv_hard_iface *hard_iface;
1109	struct batadv_softif_vlan *vlan;
1110
1111	list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
1112		if (hard_iface->soft_iface == soft_iface)
1113			batadv_hardif_disable_interface(hard_iface,
1114							BATADV_IF_CLEANUP_KEEP);
1115	}
1116
1117	/* destroy the "untagged" VLAN */
1118	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
1119	if (vlan) {
1120		batadv_softif_destroy_vlan(bat_priv, vlan);
1121		batadv_softif_vlan_put(vlan);
1122	}
1123
1124	batadv_sysfs_del_meshif(soft_iface);
1125	unregister_netdevice_queue(soft_iface, head);
1126}
1127
1128/**
1129 * batadv_softif_is_valid() - Check whether device is a batadv soft interface
1130 * @net_dev: device which should be checked
1131 *
1132 * Return: true when net_dev is a batman-adv interface, false otherwise
1133 */
1134bool batadv_softif_is_valid(const struct net_device *net_dev)
1135{
1136	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
1137		return true;
1138
1139	return false;
1140}
1141
1142struct rtnl_link_ops batadv_link_ops __read_mostly = {
1143	.kind		= "batadv",
1144	.priv_size	= sizeof(struct batadv_priv),
1145	.setup		= batadv_softif_init_early,
1146	.dellink	= batadv_softif_destroy_netlink,
1147};