1/*
   2 * lec.c: Lan Emulation driver
   3 *
   4 * Marko Kiiskila <mkiiskila@yahoo.com>
   5 */
   6
   7#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9#include <linux/slab.h>
  10#include <linux/kernel.h>
  11#include <linux/bitops.h>
  12#include <linux/capability.h>
  13
  14/* We are ethernet device */
  15#include <linux/if_ether.h>
  16#include <linux/netdevice.h>
  17#include <linux/etherdevice.h>
  18#include <net/sock.h>
  19#include <linux/skbuff.h>
  20#include <linux/ip.h>
  21#include <asm/byteorder.h>
  22#include <linux/uaccess.h>
  23#include <net/arp.h>
  24#include <net/dst.h>
  25#include <linux/proc_fs.h>
  26#include <linux/spinlock.h>
  27#include <linux/seq_file.h>
  28
  29/* And atm device */
  30#include <linux/atmdev.h>
  31#include <linux/atmlec.h>
  32
  33/* Proxy LEC knows about bridging */
  34#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  35#include "../bridge/br_private.h"
  36
  37static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  38#endif
  39
  40/* Modular too */
  41#include <linux/module.h>
  42#include <linux/init.h>
  43
 
 
 
  44#include "lec.h"
  45#include "lec_arpc.h"
  46#include "resources.h"
  47
  48#define DUMP_PACKETS 0		/*
  49				 * 0 = None,
  50				 * 1 = 30 first bytes
  51				 * 2 = Whole packet
  52				 */
  53
  54#define LEC_UNRES_QUE_LEN 8	/*
  55				 * number of tx packets to queue for a
  56				 * single destination while waiting for SVC
  57				 */
  58
  59static int lec_open(struct net_device *dev);
  60static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  61				  struct net_device *dev);
  62static int lec_close(struct net_device *dev);
  63static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  64					  const unsigned char *mac_addr);
  65static int lec_arp_remove(struct lec_priv *priv,
  66			  struct lec_arp_table *to_remove);
  67/* LANE2 functions */
  68static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  69				const u8 *tlvs, u32 sizeoftlvs);
  70static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  71			 u8 **tlvs, u32 *sizeoftlvs);
  72static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  73			       const u8 *tlvs, u32 sizeoftlvs);
  74
  75static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  76			   unsigned long permanent);
  77static void lec_arp_check_empties(struct lec_priv *priv,
  78				  struct atm_vcc *vcc, struct sk_buff *skb);
  79static void lec_arp_destroy(struct lec_priv *priv);
  80static void lec_arp_init(struct lec_priv *priv);
  81static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  82				       const unsigned char *mac_to_find,
  83				       int is_rdesc,
  84				       struct lec_arp_table **ret_entry);
  85static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  86			   const unsigned char *atm_addr,
  87			   unsigned long remoteflag,
  88			   unsigned int targetless_le_arp);
  89static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  90static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  91static void lec_set_flush_tran_id(struct lec_priv *priv,
  92				  const unsigned char *atm_addr,
  93				  unsigned long tran_id);
  94static void lec_vcc_added(struct lec_priv *priv,
  95			  const struct atmlec_ioc *ioc_data,
  96			  struct atm_vcc *vcc,
  97			  void (*old_push)(struct atm_vcc *vcc,
  98					   struct sk_buff *skb));
  99static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 100
 101/* must be done under lec_arp_lock */
 102static inline void lec_arp_hold(struct lec_arp_table *entry)
 103{
 104	atomic_inc(&entry->usage);
 105}
 106
 107static inline void lec_arp_put(struct lec_arp_table *entry)
 108{
 109	if (atomic_dec_and_test(&entry->usage))
 110		kfree(entry);
 111}
 112
 113static struct lane2_ops lane2_ops = {
 114	lane2_resolve,		/* resolve,             spec 3.1.3 */
 115	lane2_associate_req,	/* associate_req,       spec 3.1.4 */
 116	NULL			/* associate indicator, spec 3.1.5 */
 117};
 118
 119static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 120
 121/* Device structures */
 122static struct net_device *dev_lec[MAX_LEC_ITF];
 123
 124#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 125static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 126{
 127	char *buff;
 128	struct lec_priv *priv;
 129
 130	/*
 131	 * Check if this is a BPDU. If so, ask zeppelin to send
 132	 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 133	 * as the Config BPDU has
 134	 */
 135	buff = skb->data + skb->dev->hard_header_len;
 136	if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 137		struct sock *sk;
 138		struct sk_buff *skb2;
 139		struct atmlec_msg *mesg;
 140
 141		skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 142		if (skb2 == NULL)
 143			return;
 144		skb2->len = sizeof(struct atmlec_msg);
 145		mesg = (struct atmlec_msg *)skb2->data;
 146		mesg->type = l_topology_change;
 147		buff += 4;
 148		mesg->content.normal.flag = *buff & 0x01;
 149					/* 0x01 is topology change */
 150
 151		priv = netdev_priv(dev);
 152		atm_force_charge(priv->lecd, skb2->truesize);
 153		sk = sk_atm(priv->lecd);
 154		skb_queue_tail(&sk->sk_receive_queue, skb2);
 155		sk->sk_data_ready(sk);
 156	}
 157}
 158#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 159
 160/*
 161 * Open/initialize the netdevice. This is called (in the current kernel)
 162 * sometime after booting when the 'ifconfig' program is run.
 163 *
 164 * This routine should set everything up anew at each open, even
 165 * registers that "should" only need to be set once at boot, so that
 166 * there is non-reboot way to recover if something goes wrong.
 167 */
 168
 169static int lec_open(struct net_device *dev)
 170{
 171	netif_start_queue(dev);
 172
 173	return 0;
 174}
 175
 176static void
 177lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 178{
 179	struct net_device *dev = skb->dev;
 180
 181	ATM_SKB(skb)->vcc = vcc;
 182	ATM_SKB(skb)->atm_options = vcc->atm_options;
 183
 184	atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 185	if (vcc->send(vcc, skb) < 0) {
 186		dev->stats.tx_dropped++;
 187		return;
 188	}
 189
 190	dev->stats.tx_packets++;
 191	dev->stats.tx_bytes += skb->len;
 192}
 193
 194static void lec_tx_timeout(struct net_device *dev)
 195{
 196	pr_info("%s\n", dev->name);
 197	dev->trans_start = jiffies;
 198	netif_wake_queue(dev);
 199}
 200
 201static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 202				  struct net_device *dev)
 203{
 204	struct sk_buff *skb2;
 205	struct lec_priv *priv = netdev_priv(dev);
 206	struct lecdatahdr_8023 *lec_h;
 207	struct atm_vcc *vcc;
 208	struct lec_arp_table *entry;
 209	unsigned char *dst;
 210	int min_frame_size;
 211	int is_rdesc;
 212
 213	pr_debug("called\n");
 214	if (!priv->lecd) {
 215		pr_info("%s:No lecd attached\n", dev->name);
 216		dev->stats.tx_errors++;
 217		netif_stop_queue(dev);
 218		kfree_skb(skb);
 219		return NETDEV_TX_OK;
 220	}
 221
 222	pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 223		 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 224		 (long)skb_end_pointer(skb));
 225#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 226	if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 227		lec_handle_bridge(skb, dev);
 228#endif
 229
 230	/* Make sure we have room for lec_id */
 231	if (skb_headroom(skb) < 2) {
 232		pr_debug("reallocating skb\n");
 233		skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 234		if (unlikely(!skb2)) {
 235			kfree_skb(skb);
 236			return NETDEV_TX_OK;
 237		}
 238		consume_skb(skb);
 239		skb = skb2;
 240	}
 241	skb_push(skb, 2);
 242
 243	/* Put le header to place */
 244	lec_h = (struct lecdatahdr_8023 *)skb->data;
 245	lec_h->le_header = htons(priv->lecid);
 246
 247#if DUMP_PACKETS >= 2
 248#define MAX_DUMP_SKB 99
 249#elif DUMP_PACKETS >= 1
 250#define MAX_DUMP_SKB 30
 251#endif
 252#if DUMP_PACKETS >= 1
 253	printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 254	       dev->name, skb->len, priv->lecid);
 255	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 256		       skb->data, min(skb->len, MAX_DUMP_SKB), true);
 257#endif /* DUMP_PACKETS >= 1 */
 258
 259	/* Minimum ethernet-frame size */
 260	min_frame_size = LEC_MINIMUM_8023_SIZE;
 261	if (skb->len < min_frame_size) {
 262		if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 263			skb2 = skb_copy_expand(skb, 0,
 264					       min_frame_size - skb->truesize,
 265					       GFP_ATOMIC);
 266			dev_kfree_skb(skb);
 267			if (skb2 == NULL) {
 268				dev->stats.tx_dropped++;
 269				return NETDEV_TX_OK;
 270			}
 271			skb = skb2;
 272		}
 273		skb_put(skb, min_frame_size - skb->len);
 274	}
 275
 276	/* Send to right vcc */
 277	is_rdesc = 0;
 278	dst = lec_h->h_dest;
 279	entry = NULL;
 280	vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 281	pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 282		 dev->name, vcc, vcc ? vcc->flags : 0, entry);
 283	if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 284		if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 285			pr_debug("%s:queuing packet, MAC address %pM\n",
 286				 dev->name, lec_h->h_dest);
 287			skb_queue_tail(&entry->tx_wait, skb);
 288		} else {
 289			pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 290				 dev->name, lec_h->h_dest);
 291			dev->stats.tx_dropped++;
 292			dev_kfree_skb(skb);
 293		}
 294		goto out;
 295	}
 296#if DUMP_PACKETS > 0
 297	printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 298	       dev->name, vcc->vpi, vcc->vci);
 299#endif /* DUMP_PACKETS > 0 */
 300
 301	while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 302		pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 303		lec_send(vcc, skb2);
 304	}
 305
 306	lec_send(vcc, skb);
 307
 308	if (!atm_may_send(vcc, 0)) {
 309		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 310
 311		vpriv->xoff = 1;
 312		netif_stop_queue(dev);
 313
 314		/*
 315		 * vcc->pop() might have occurred in between, making
 316		 * the vcc usuable again.  Since xmit is serialized,
 317		 * this is the only situation we have to re-test.
 318		 */
 319
 320		if (atm_may_send(vcc, 0))
 321			netif_wake_queue(dev);
 322	}
 323
 324out:
 325	if (entry)
 326		lec_arp_put(entry);
 327	dev->trans_start = jiffies;
 328	return NETDEV_TX_OK;
 329}
 330
 331/* The inverse routine to net_open(). */
 332static int lec_close(struct net_device *dev)
 333{
 334	netif_stop_queue(dev);
 335	return 0;
 336}
 337
 338static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 339{
 340	unsigned long flags;
 341	struct net_device *dev = (struct net_device *)vcc->proto_data;
 342	struct lec_priv *priv = netdev_priv(dev);
 343	struct atmlec_msg *mesg;
 344	struct lec_arp_table *entry;
 345	int i;
 346	char *tmp;		/* FIXME */
 347
 348	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 349	mesg = (struct atmlec_msg *)skb->data;
 350	tmp = skb->data;
 351	tmp += sizeof(struct atmlec_msg);
 352	pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 353	switch (mesg->type) {
 354	case l_set_mac_addr:
 355		for (i = 0; i < 6; i++)
 356			dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 357		break;
 358	case l_del_mac_addr:
 359		for (i = 0; i < 6; i++)
 360			dev->dev_addr[i] = 0;
 361		break;
 362	case l_addr_delete:
 363		lec_addr_delete(priv, mesg->content.normal.atm_addr,
 364				mesg->content.normal.flag);
 365		break;
 366	case l_topology_change:
 367		priv->topology_change = mesg->content.normal.flag;
 368		break;
 369	case l_flush_complete:
 370		lec_flush_complete(priv, mesg->content.normal.flag);
 371		break;
 372	case l_narp_req:	/* LANE2: see 7.1.35 in the lane2 spec */
 373		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 374		entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 375		lec_arp_remove(priv, entry);
 376		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 377
 378		if (mesg->content.normal.no_source_le_narp)
 379			break;
 380		/* FALL THROUGH */
 381	case l_arp_update:
 382		lec_arp_update(priv, mesg->content.normal.mac_addr,
 383			       mesg->content.normal.atm_addr,
 384			       mesg->content.normal.flag,
 385			       mesg->content.normal.targetless_le_arp);
 386		pr_debug("in l_arp_update\n");
 387		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
 388			pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 389				 mesg->sizeoftlvs);
 390			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 391					    tmp, mesg->sizeoftlvs);
 392		}
 393		break;
 394	case l_config:
 395		priv->maximum_unknown_frame_count =
 396		    mesg->content.config.maximum_unknown_frame_count;
 397		priv->max_unknown_frame_time =
 398		    (mesg->content.config.max_unknown_frame_time * HZ);
 399		priv->max_retry_count = mesg->content.config.max_retry_count;
 400		priv->aging_time = (mesg->content.config.aging_time * HZ);
 401		priv->forward_delay_time =
 402		    (mesg->content.config.forward_delay_time * HZ);
 403		priv->arp_response_time =
 404		    (mesg->content.config.arp_response_time * HZ);
 405		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 406		priv->path_switching_delay =
 407		    (mesg->content.config.path_switching_delay * HZ);
 408		priv->lane_version = mesg->content.config.lane_version;
 409					/* LANE2 */
 410		priv->lane2_ops = NULL;
 411		if (priv->lane_version > 1)
 412			priv->lane2_ops = &lane2_ops;
 413		rtnl_lock();
 414		if (dev_set_mtu(dev, mesg->content.config.mtu))
 415			pr_info("%s: change_mtu to %d failed\n",
 416				dev->name, mesg->content.config.mtu);
 417		rtnl_unlock();
 418		priv->is_proxy = mesg->content.config.is_proxy;
 419		break;
 420	case l_flush_tran_id:
 421		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 422				      mesg->content.normal.flag);
 423		break;
 424	case l_set_lecid:
 425		priv->lecid =
 426		    (unsigned short)(0xffff & mesg->content.normal.flag);
 427		break;
 428	case l_should_bridge:
 429#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 430	{
 431		pr_debug("%s: bridge zeppelin asks about %pM\n",
 432			 dev->name, mesg->content.proxy.mac_addr);
 433
 434		if (br_fdb_test_addr_hook == NULL)
 435			break;
 436
 437		if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 438			/* hit from bridge table, send LE_ARP_RESPONSE */
 439			struct sk_buff *skb2;
 440			struct sock *sk;
 441
 442			pr_debug("%s: entry found, responding to zeppelin\n",
 443				 dev->name);
 444			skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 445			if (skb2 == NULL)
 446				break;
 447			skb2->len = sizeof(struct atmlec_msg);
 448			skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 449			atm_force_charge(priv->lecd, skb2->truesize);
 450			sk = sk_atm(priv->lecd);
 451			skb_queue_tail(&sk->sk_receive_queue, skb2);
 452			sk->sk_data_ready(sk);
 453		}
 454	}
 455#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 456		break;
 457	default:
 458		pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 459		dev_kfree_skb(skb);
 460		return -EINVAL;
 461	}
 462	dev_kfree_skb(skb);
 463	return 0;
 464}
 465
 466static void lec_atm_close(struct atm_vcc *vcc)
 467{
 468	struct sk_buff *skb;
 469	struct net_device *dev = (struct net_device *)vcc->proto_data;
 470	struct lec_priv *priv = netdev_priv(dev);
 471
 472	priv->lecd = NULL;
 473	/* Do something needful? */
 474
 475	netif_stop_queue(dev);
 476	lec_arp_destroy(priv);
 477
 478	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 479		pr_info("%s closing with messages pending\n", dev->name);
 480	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 481		atm_return(vcc, skb->truesize);
 482		dev_kfree_skb(skb);
 483	}
 484
 485	pr_info("%s: Shut down!\n", dev->name);
 486	module_put(THIS_MODULE);
 487}
 488
 489static struct atmdev_ops lecdev_ops = {
 490	.close = lec_atm_close,
 491	.send = lec_atm_send
 492};
 493
 494static struct atm_dev lecatm_dev = {
 495	.ops = &lecdev_ops,
 496	.type = "lec",
 497	.number = 999,		/* dummy device number */
 498	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 499};
 500
 501/*
 502 * LANE2: new argument struct sk_buff *data contains
 503 * the LE_ARP based TLVs introduced in the LANE2 spec
 504 */
 505static int
 506send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 507	     const unsigned char *mac_addr, const unsigned char *atm_addr,
 508	     struct sk_buff *data)
 509{
 510	struct sock *sk;
 511	struct sk_buff *skb;
 512	struct atmlec_msg *mesg;
 513
 514	if (!priv || !priv->lecd)
 515		return -1;
 516	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 517	if (!skb)
 518		return -1;
 519	skb->len = sizeof(struct atmlec_msg);
 520	mesg = (struct atmlec_msg *)skb->data;
 521	memset(mesg, 0, sizeof(struct atmlec_msg));
 522	mesg->type = type;
 523	if (data != NULL)
 524		mesg->sizeoftlvs = data->len;
 525	if (mac_addr)
 526		ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 527	else
 528		mesg->content.normal.targetless_le_arp = 1;
 529	if (atm_addr)
 530		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 531
 532	atm_force_charge(priv->lecd, skb->truesize);
 533	sk = sk_atm(priv->lecd);
 534	skb_queue_tail(&sk->sk_receive_queue, skb);
 535	sk->sk_data_ready(sk);
 536
 537	if (data != NULL) {
 538		pr_debug("about to send %d bytes of data\n", data->len);
 539		atm_force_charge(priv->lecd, data->truesize);
 540		skb_queue_tail(&sk->sk_receive_queue, data);
 541		sk->sk_data_ready(sk);
 542	}
 543
 544	return 0;
 545}
 546
 547/* shamelessly stolen from drivers/net/net_init.c */
 548static int lec_change_mtu(struct net_device *dev, int new_mtu)
 549{
 550	if ((new_mtu < 68) || (new_mtu > 18190))
 551		return -EINVAL;
 552	dev->mtu = new_mtu;
 553	return 0;
 554}
 555
 556static void lec_set_multicast_list(struct net_device *dev)
 557{
 558	/*
 559	 * by default, all multicast frames arrive over the bus.
 560	 * eventually support selective multicast service
 561	 */
 562}
 563
 564static const struct net_device_ops lec_netdev_ops = {
 565	.ndo_open		= lec_open,
 566	.ndo_stop		= lec_close,
 567	.ndo_start_xmit		= lec_start_xmit,
 568	.ndo_change_mtu		= lec_change_mtu,
 569	.ndo_tx_timeout		= lec_tx_timeout,
 570	.ndo_set_rx_mode	= lec_set_multicast_list,
 571};
 572
 573static const unsigned char lec_ctrl_magic[] = {
 574	0xff,
 575	0x00,
 576	0x01,
 577	0x01
 578};
 579
 580#define LEC_DATA_DIRECT_8023  2
 581#define LEC_DATA_DIRECT_8025  3
 582
 583static int lec_is_data_direct(struct atm_vcc *vcc)
 584{
 585	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 586		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 587}
 588
 589static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 590{
 591	unsigned long flags;
 592	struct net_device *dev = (struct net_device *)vcc->proto_data;
 593	struct lec_priv *priv = netdev_priv(dev);
 594
 595#if DUMP_PACKETS > 0
 596	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 597	       dev->name, vcc->vpi, vcc->vci);
 598#endif
 599	if (!skb) {
 600		pr_debug("%s: null skb\n", dev->name);
 601		lec_vcc_close(priv, vcc);
 602		return;
 603	}
 604#if DUMP_PACKETS >= 2
 605#define MAX_SKB_DUMP 99
 606#elif DUMP_PACKETS >= 1
 607#define MAX_SKB_DUMP 30
 608#endif
 609#if DUMP_PACKETS > 0
 610	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 611	       dev->name, skb->len, priv->lecid);
 612	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 613		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 614#endif /* DUMP_PACKETS > 0 */
 615	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 616				/* Control frame, to daemon */
 617		struct sock *sk = sk_atm(vcc);
 618
 619		pr_debug("%s: To daemon\n", dev->name);
 620		skb_queue_tail(&sk->sk_receive_queue, skb);
 621		sk->sk_data_ready(sk);
 622	} else {		/* Data frame, queue to protocol handlers */
 623		struct lec_arp_table *entry;
 624		unsigned char *src, *dst;
 625
 626		atm_return(vcc, skb->truesize);
 627		if (*(__be16 *) skb->data == htons(priv->lecid) ||
 628		    !priv->lecd || !(dev->flags & IFF_UP)) {
 629			/*
 630			 * Probably looping back, or if lecd is missing,
 631			 * lecd has gone down
 632			 */
 633			pr_debug("Ignoring frame...\n");
 634			dev_kfree_skb(skb);
 635			return;
 636		}
 637		dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 638
 639		/*
 640		 * If this is a Data Direct VCC, and the VCC does not match
 641		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 642		 */
 643		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 644		if (lec_is_data_direct(vcc)) {
 645			src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 646			entry = lec_arp_find(priv, src);
 647			if (entry && entry->vcc != vcc) {
 648				lec_arp_remove(priv, entry);
 649				lec_arp_put(entry);
 650			}
 651		}
 652		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 653
 654		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
 655		    !priv->is_proxy &&	/* Proxy wants all the packets */
 656		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 657			dev_kfree_skb(skb);
 658			return;
 659		}
 660		if (!hlist_empty(&priv->lec_arp_empty_ones))
 661			lec_arp_check_empties(priv, vcc, skb);
 662		skb_pull(skb, 2);	/* skip lec_id */
 663		skb->protocol = eth_type_trans(skb, dev);
 664		dev->stats.rx_packets++;
 665		dev->stats.rx_bytes += skb->len;
 666		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 667		netif_rx(skb);
 668	}
 669}
 670
 671static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 672{
 673	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 674	struct net_device *dev = skb->dev;
 675
 676	if (vpriv == NULL) {
 677		pr_info("vpriv = NULL!?!?!?\n");
 678		return;
 679	}
 680
 681	vpriv->old_pop(vcc, skb);
 682
 683	if (vpriv->xoff && atm_may_send(vcc, 0)) {
 684		vpriv->xoff = 0;
 685		if (netif_running(dev) && netif_queue_stopped(dev))
 686			netif_wake_queue(dev);
 687	}
 688}
 689
 690static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 691{
 692	struct lec_vcc_priv *vpriv;
 693	int bytes_left;
 694	struct atmlec_ioc ioc_data;
 695
 696	/* Lecd must be up in this case */
 697	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 698	if (bytes_left != 0)
 699		pr_info("copy from user failed for %d bytes\n", bytes_left);
 700	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 701	    !dev_lec[ioc_data.dev_num])
 
 
 702		return -EINVAL;
 703	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 704	if (!vpriv)
 705		return -ENOMEM;
 706	vpriv->xoff = 0;
 707	vpriv->old_pop = vcc->pop;
 708	vcc->user_back = vpriv;
 709	vcc->pop = lec_pop;
 710	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 711		      &ioc_data, vcc, vcc->push);
 712	vcc->proto_data = dev_lec[ioc_data.dev_num];
 713	vcc->push = lec_push;
 714	return 0;
 715}
 716
 717static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 718{
 719	if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 
 
 
 720		return -EINVAL;
 721	vcc->proto_data = dev_lec[arg];
 722	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 723}
 724
 725/* Initialize device. */
 726static int lecd_attach(struct atm_vcc *vcc, int arg)
 727{
 728	int i;
 729	struct lec_priv *priv;
 730
 731	if (arg < 0)
 732		i = 0;
 733	else
 734		i = arg;
 735	if (arg >= MAX_LEC_ITF)
 736		return -EINVAL;
 
 737	if (!dev_lec[i]) {
 738		int size;
 739
 740		size = sizeof(struct lec_priv);
 741		dev_lec[i] = alloc_etherdev(size);
 742		if (!dev_lec[i])
 743			return -ENOMEM;
 744		dev_lec[i]->netdev_ops = &lec_netdev_ops;
 
 745		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 746		if (register_netdev(dev_lec[i])) {
 747			free_netdev(dev_lec[i]);
 748			return -EINVAL;
 749		}
 750
 751		priv = netdev_priv(dev_lec[i]);
 752	} else {
 753		priv = netdev_priv(dev_lec[i]);
 754		if (priv->lecd)
 755			return -EADDRINUSE;
 756	}
 757	lec_arp_init(priv);
 758	priv->itfnum = i;	/* LANE2 addition */
 759	priv->lecd = vcc;
 760	vcc->dev = &lecatm_dev;
 761	vcc_insert_socket(sk_atm(vcc));
 762
 763	vcc->proto_data = dev_lec[i];
 764	set_bit(ATM_VF_META, &vcc->flags);
 765	set_bit(ATM_VF_READY, &vcc->flags);
 766
 767	/* Set default values to these variables */
 768	priv->maximum_unknown_frame_count = 1;
 769	priv->max_unknown_frame_time = (1 * HZ);
 770	priv->vcc_timeout_period = (1200 * HZ);
 771	priv->max_retry_count = 1;
 772	priv->aging_time = (300 * HZ);
 773	priv->forward_delay_time = (15 * HZ);
 774	priv->topology_change = 0;
 775	priv->arp_response_time = (1 * HZ);
 776	priv->flush_timeout = (4 * HZ);
 777	priv->path_switching_delay = (6 * HZ);
 778
 779	if (dev_lec[i]->flags & IFF_UP)
 780		netif_start_queue(dev_lec[i]);
 781	__module_get(THIS_MODULE);
 782	return i;
 783}
 784
 785#ifdef CONFIG_PROC_FS
 786static const char *lec_arp_get_status_string(unsigned char status)
 787{
 788	static const char *const lec_arp_status_string[] = {
 789		"ESI_UNKNOWN       ",
 790		"ESI_ARP_PENDING   ",
 791		"ESI_VC_PENDING    ",
 792		"<Undefined>       ",
 793		"ESI_FLUSH_PENDING ",
 794		"ESI_FORWARD_DIRECT"
 795	};
 796
 797	if (status > ESI_FORWARD_DIRECT)
 798		status = 3;	/* ESI_UNDEFINED */
 799	return lec_arp_status_string[status];
 800}
 801
 802static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 803{
 804	int i;
 805
 806	for (i = 0; i < ETH_ALEN; i++)
 807		seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 808	seq_printf(seq, " ");
 809	for (i = 0; i < ATM_ESA_LEN; i++)
 810		seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 811	seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 812		   entry->flags & 0xffff);
 813	if (entry->vcc)
 814		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 815	else
 816		seq_printf(seq, "        ");
 817	if (entry->recv_vcc) {
 818		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 819			   entry->recv_vcc->vci);
 820	}
 821	seq_putc(seq, '\n');
 822}
 823
 824struct lec_state {
 825	unsigned long flags;
 826	struct lec_priv *locked;
 827	struct hlist_node *node;
 828	struct net_device *dev;
 829	int itf;
 830	int arp_table;
 831	int misc_table;
 832};
 833
 834static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 835			  loff_t *l)
 836{
 837	struct hlist_node *e = state->node;
 838
 839	if (!e)
 840		e = tbl->first;
 841	if (e == SEQ_START_TOKEN) {
 842		e = tbl->first;
 843		--*l;
 844	}
 845
 846	for (; e; e = e->next) {
 847		if (--*l < 0)
 848			break;
 849	}
 850	state->node = e;
 851
 852	return (*l < 0) ? state : NULL;
 853}
 854
 855static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 856			  struct lec_priv *priv)
 857{
 858	void *v = NULL;
 859	int p;
 860
 861	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 862		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 863		if (v)
 864			break;
 865	}
 866	state->arp_table = p;
 867	return v;
 868}
 869
 870static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 871			   struct lec_priv *priv)
 872{
 873	struct hlist_head *lec_misc_tables[] = {
 874		&priv->lec_arp_empty_ones,
 875		&priv->lec_no_forward,
 876		&priv->mcast_fwds
 877	};
 878	void *v = NULL;
 879	int q;
 880
 881	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 882		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 883		if (v)
 884			break;
 885	}
 886	state->misc_table = q;
 887	return v;
 888}
 889
 890static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 891			   struct lec_priv *priv)
 892{
 893	if (!state->locked) {
 894		state->locked = priv;
 895		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 896	}
 897	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 898		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 899		state->locked = NULL;
 900		/* Partial state reset for the next time we get called */
 901		state->arp_table = state->misc_table = 0;
 902	}
 903	return state->locked;
 904}
 905
 906static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 907{
 908	struct net_device *dev;
 909	void *v;
 910
 911	dev = state->dev ? state->dev : dev_lec[state->itf];
 912	v = (dev && netdev_priv(dev)) ?
 913		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 914	if (!v && dev) {
 915		dev_put(dev);
 916		/* Partial state reset for the next time we get called */
 917		dev = NULL;
 918	}
 919	state->dev = dev;
 920	return v;
 921}
 922
 923static void *lec_get_idx(struct lec_state *state, loff_t l)
 924{
 925	void *v = NULL;
 926
 927	for (; state->itf < MAX_LEC_ITF; state->itf++) {
 928		v = lec_itf_walk(state, &l);
 929		if (v)
 930			break;
 931	}
 932	return v;
 933}
 934
 935static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 936{
 937	struct lec_state *state = seq->private;
 938
 939	state->itf = 0;
 940	state->dev = NULL;
 941	state->locked = NULL;
 942	state->arp_table = 0;
 943	state->misc_table = 0;
 944	state->node = SEQ_START_TOKEN;
 945
 946	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 947}
 948
 949static void lec_seq_stop(struct seq_file *seq, void *v)
 950{
 951	struct lec_state *state = seq->private;
 952
 953	if (state->dev) {
 954		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 955				       state->flags);
 956		dev_put(state->dev);
 957	}
 958}
 959
 960static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 961{
 962	struct lec_state *state = seq->private;
 963
 964	v = lec_get_idx(state, 1);
 965	*pos += !!PTR_ERR(v);
 966	return v;
 967}
 968
 969static int lec_seq_show(struct seq_file *seq, void *v)
 970{
 971	static const char lec_banner[] =
 972	    "Itf  MAC          ATM destination"
 973	    "                          Status            Flags "
 974	    "VPI/VCI Recv VPI/VCI\n";
 975
 976	if (v == SEQ_START_TOKEN)
 977		seq_puts(seq, lec_banner);
 978	else {
 979		struct lec_state *state = seq->private;
 980		struct net_device *dev = state->dev;
 981		struct lec_arp_table *entry = hlist_entry(state->node,
 982							  struct lec_arp_table,
 983							  next);
 984
 985		seq_printf(seq, "%s ", dev->name);
 986		lec_info(seq, entry);
 987	}
 988	return 0;
 989}
 990
 991static const struct seq_operations lec_seq_ops = {
 992	.start = lec_seq_start,
 993	.next = lec_seq_next,
 994	.stop = lec_seq_stop,
 995	.show = lec_seq_show,
 996};
 997
 998static int lec_seq_open(struct inode *inode, struct file *file)
 999{
1000	return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1001}
1002
1003static const struct file_operations lec_seq_fops = {
1004	.owner = THIS_MODULE,
1005	.open = lec_seq_open,
1006	.read = seq_read,
1007	.llseek = seq_lseek,
1008	.release = seq_release_private,
1009};
1010#endif
1011
1012static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1013{
1014	struct atm_vcc *vcc = ATM_SD(sock);
1015	int err = 0;
1016
1017	switch (cmd) {
1018	case ATMLEC_CTRL:
1019	case ATMLEC_MCAST:
1020	case ATMLEC_DATA:
1021		if (!capable(CAP_NET_ADMIN))
1022			return -EPERM;
1023		break;
1024	default:
1025		return -ENOIOCTLCMD;
1026	}
1027
1028	switch (cmd) {
1029	case ATMLEC_CTRL:
1030		err = lecd_attach(vcc, (int)arg);
1031		if (err >= 0)
1032			sock->state = SS_CONNECTED;
1033		break;
1034	case ATMLEC_MCAST:
1035		err = lec_mcast_attach(vcc, (int)arg);
1036		break;
1037	case ATMLEC_DATA:
1038		err = lec_vcc_attach(vcc, (void __user *)arg);
1039		break;
1040	}
1041
1042	return err;
1043}
1044
1045static struct atm_ioctl lane_ioctl_ops = {
1046	.owner = THIS_MODULE,
1047	.ioctl = lane_ioctl,
1048};
1049
1050static int __init lane_module_init(void)
1051{
1052#ifdef CONFIG_PROC_FS
1053	struct proc_dir_entry *p;
1054
1055	p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
 
1056	if (!p) {
1057		pr_err("Unable to initialize /proc/net/atm/lec\n");
1058		return -ENOMEM;
1059	}
1060#endif
1061
1062	register_atm_ioctl(&lane_ioctl_ops);
1063	pr_info("lec.c: initialized\n");
1064	return 0;
1065}
1066
1067static void __exit lane_module_cleanup(void)
1068{
1069	int i;
1070
 
1071	remove_proc_entry("lec", atm_proc_root);
 
1072
1073	deregister_atm_ioctl(&lane_ioctl_ops);
1074
1075	for (i = 0; i < MAX_LEC_ITF; i++) {
1076		if (dev_lec[i] != NULL) {
1077			unregister_netdev(dev_lec[i]);
1078			free_netdev(dev_lec[i]);
1079			dev_lec[i] = NULL;
1080		}
1081	}
1082}
1083
1084module_init(lane_module_init);
1085module_exit(lane_module_cleanup);
1086
1087/*
1088 * LANE2: 3.1.3, LE_RESOLVE.request
1089 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1090 * If sizeoftlvs == NULL the default TLVs associated with with this
1091 * lec will be used.
1092 * If dst_mac == NULL, targetless LE_ARP will be sent
1093 */
1094static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1095			 u8 **tlvs, u32 *sizeoftlvs)
1096{
1097	unsigned long flags;
1098	struct lec_priv *priv = netdev_priv(dev);
1099	struct lec_arp_table *table;
1100	struct sk_buff *skb;
1101	int retval;
1102
1103	if (force == 0) {
1104		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1105		table = lec_arp_find(priv, dst_mac);
1106		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1107		if (table == NULL)
1108			return -1;
1109
1110		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1111		if (*tlvs == NULL)
1112			return -1;
1113
1114		*sizeoftlvs = table->sizeoftlvs;
1115
1116		return 0;
1117	}
1118
1119	if (sizeoftlvs == NULL)
1120		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1121
1122	else {
1123		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1124		if (skb == NULL)
1125			return -1;
1126		skb->len = *sizeoftlvs;
1127		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1128		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1129	}
1130	return retval;
1131}
1132
1133/*
1134 * LANE2: 3.1.4, LE_ASSOCIATE.request
1135 * Associate the *tlvs with the *lan_dst address.
1136 * Will overwrite any previous association
1137 * Returns 1 for success, 0 for failure (out of memory)
1138 *
1139 */
1140static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1141			       const u8 *tlvs, u32 sizeoftlvs)
1142{
1143	int retval;
1144	struct sk_buff *skb;
1145	struct lec_priv *priv = netdev_priv(dev);
1146
1147	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1148		return 0;	/* not our mac address */
1149
1150	kfree(priv->tlvs);	/* NULL if there was no previous association */
1151
1152	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1153	if (priv->tlvs == NULL)
1154		return 0;
1155	priv->sizeoftlvs = sizeoftlvs;
1156
1157	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1158	if (skb == NULL)
1159		return 0;
1160	skb->len = sizeoftlvs;
1161	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1162	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1163	if (retval != 0)
1164		pr_info("lec.c: lane2_associate_req() failed\n");
1165	/*
1166	 * If the previous association has changed we must
1167	 * somehow notify other LANE entities about the change
1168	 */
1169	return 1;
1170}
1171
1172/*
1173 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1174 *
1175 */
1176static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1177				const u8 *tlvs, u32 sizeoftlvs)
1178{
1179#if 0
1180	int i = 0;
1181#endif
1182	struct lec_priv *priv = netdev_priv(dev);
1183#if 0				/*
1184				 * Why have the TLVs in LE_ARP entries
1185				 * since we do not use them? When you
1186				 * uncomment this code, make sure the
1187				 * TLVs get freed when entry is killed
1188				 */
1189	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1190
1191	if (entry == NULL)
1192		return;		/* should not happen */
1193
1194	kfree(entry->tlvs);
1195
1196	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1197	if (entry->tlvs == NULL)
1198		return;
1199	entry->sizeoftlvs = sizeoftlvs;
1200#endif
1201#if 0
1202	pr_info("\n");
1203	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1204	while (i < sizeoftlvs)
1205		pr_cont("%02x ", tlvs[i++]);
1206
1207	pr_cont("\n");
1208#endif
1209
1210	/* tell MPOA about the TLVs we saw */
1211	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1212		priv->lane2_ops->associate_indicator(dev, mac_addr,
1213						     tlvs, sizeoftlvs);
1214	}
1215}
1216
1217/*
1218 * Here starts what used to lec_arpc.c
1219 *
1220 * lec_arpc.c was added here when making
1221 * lane client modular. October 1997
1222 */
1223
1224#include <linux/types.h>
1225#include <linux/timer.h>
1226#include <linux/param.h>
1227#include <linux/atomic.h>
1228#include <linux/inetdevice.h>
1229#include <net/route.h>
1230
1231#if 0
1232#define pr_debug(format, args...)
1233/*
1234  #define pr_debug printk
1235*/
1236#endif
1237#define DEBUG_ARP_TABLE 0
1238
1239#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1240
1241static void lec_arp_check_expire(struct work_struct *work);
1242static void lec_arp_expire_arp(unsigned long data);
1243
1244/*
1245 * Arp table funcs
1246 */
1247
1248#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1249
1250/*
1251 * Initialization of arp-cache
1252 */
1253static void lec_arp_init(struct lec_priv *priv)
1254{
1255	unsigned short i;
1256
1257	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1258		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1259	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1260	INIT_HLIST_HEAD(&priv->lec_no_forward);
1261	INIT_HLIST_HEAD(&priv->mcast_fwds);
1262	spin_lock_init(&priv->lec_arp_lock);
1263	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1264	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1265}
1266
1267static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1268{
1269	if (entry->vcc) {
1270		struct atm_vcc *vcc = entry->vcc;
1271		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1272		struct net_device *dev = (struct net_device *)vcc->proto_data;
1273
1274		vcc->pop = vpriv->old_pop;
1275		if (vpriv->xoff)
1276			netif_wake_queue(dev);
1277		kfree(vpriv);
1278		vcc->user_back = NULL;
1279		vcc->push = entry->old_push;
1280		vcc_release_async(vcc, -EPIPE);
1281		entry->vcc = NULL;
1282	}
1283	if (entry->recv_vcc) {
1284		entry->recv_vcc->push = entry->old_recv_push;
1285		vcc_release_async(entry->recv_vcc, -EPIPE);
1286		entry->recv_vcc = NULL;
1287	}
1288}
1289
1290/*
1291 * Insert entry to lec_arp_table
1292 * LANE2: Add to the end of the list to satisfy 8.1.13
1293 */
1294static inline void
1295lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1296{
1297	struct hlist_head *tmp;
1298
1299	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1300	hlist_add_head(&entry->next, tmp);
1301
1302	pr_debug("Added entry:%pM\n", entry->mac_addr);
1303}
1304
1305/*
1306 * Remove entry from lec_arp_table
1307 */
1308static int
1309lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1310{
1311	struct lec_arp_table *entry;
1312	int i, remove_vcc = 1;
1313
1314	if (!to_remove)
1315		return -1;
1316
1317	hlist_del(&to_remove->next);
1318	del_timer(&to_remove->timer);
1319
1320	/*
1321	 * If this is the only MAC connected to this VCC,
1322	 * also tear down the VCC
1323	 */
1324	if (to_remove->status >= ESI_FLUSH_PENDING) {
1325		/*
1326		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1327		 */
1328		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1329			hlist_for_each_entry(entry,
1330					     &priv->lec_arp_tables[i], next) {
1331				if (memcmp(to_remove->atm_addr,
1332					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1333					remove_vcc = 0;
1334					break;
1335				}
1336			}
1337		}
1338		if (remove_vcc)
1339			lec_arp_clear_vccs(to_remove);
1340	}
1341	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1342
1343	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1344	return 0;
1345}
1346
1347#if DEBUG_ARP_TABLE
1348static const char *get_status_string(unsigned char st)
1349{
1350	switch (st) {
1351	case ESI_UNKNOWN:
1352		return "ESI_UNKNOWN";
1353	case ESI_ARP_PENDING:
1354		return "ESI_ARP_PENDING";
1355	case ESI_VC_PENDING:
1356		return "ESI_VC_PENDING";
1357	case ESI_FLUSH_PENDING:
1358		return "ESI_FLUSH_PENDING";
1359	case ESI_FORWARD_DIRECT:
1360		return "ESI_FORWARD_DIRECT";
1361	}
1362	return "<UNKNOWN>";
1363}
1364
1365static void dump_arp_table(struct lec_priv *priv)
1366{
1367	struct lec_arp_table *rulla;
1368	char buf[256];
1369	int i, j, offset;
1370
1371	pr_info("Dump %p:\n", priv);
1372	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1373		hlist_for_each_entry(rulla,
1374				     &priv->lec_arp_tables[i], next) {
1375			offset = 0;
1376			offset += sprintf(buf, "%d: %p\n", i, rulla);
1377			offset += sprintf(buf + offset, "Mac: %pM",
1378					  rulla->mac_addr);
1379			offset += sprintf(buf + offset, " Atm:");
1380			for (j = 0; j < ATM_ESA_LEN; j++) {
1381				offset += sprintf(buf + offset,
1382						  "%2.2x ",
1383						  rulla->atm_addr[j] & 0xff);
1384			}
1385			offset += sprintf(buf + offset,
1386					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1387					  rulla->vcc ? rulla->vcc->vpi : 0,
1388					  rulla->vcc ? rulla->vcc->vci : 0,
1389					  rulla->recv_vcc ? rulla->recv_vcc->
1390					  vpi : 0,
1391					  rulla->recv_vcc ? rulla->recv_vcc->
1392					  vci : 0, rulla->last_used,
1393					  rulla->timestamp, rulla->no_tries);
1394			offset +=
1395			    sprintf(buf + offset,
1396				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1397				    rulla->flags, rulla->packets_flooded,
1398				    get_status_string(rulla->status));
1399			pr_info("%s\n", buf);
1400		}
1401	}
1402
1403	if (!hlist_empty(&priv->lec_no_forward))
1404		pr_info("No forward\n");
1405	hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1406		offset = 0;
1407		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1408		offset += sprintf(buf + offset, " Atm:");
1409		for (j = 0; j < ATM_ESA_LEN; j++) {
1410			offset += sprintf(buf + offset, "%2.2x ",
1411					  rulla->atm_addr[j] & 0xff);
1412		}
1413		offset += sprintf(buf + offset,
1414				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1415				  rulla->vcc ? rulla->vcc->vpi : 0,
1416				  rulla->vcc ? rulla->vcc->vci : 0,
1417				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1418				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1419				  rulla->last_used,
1420				  rulla->timestamp, rulla->no_tries);
1421		offset += sprintf(buf + offset,
1422				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1423				  rulla->flags, rulla->packets_flooded,
1424				  get_status_string(rulla->status));
1425		pr_info("%s\n", buf);
1426	}
1427
1428	if (!hlist_empty(&priv->lec_arp_empty_ones))
1429		pr_info("Empty ones\n");
1430	hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1431		offset = 0;
1432		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1433		offset += sprintf(buf + offset, " Atm:");
1434		for (j = 0; j < ATM_ESA_LEN; j++) {
1435			offset += sprintf(buf + offset, "%2.2x ",
1436					  rulla->atm_addr[j] & 0xff);
1437		}
1438		offset += sprintf(buf + offset,
1439				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1440				  rulla->vcc ? rulla->vcc->vpi : 0,
1441				  rulla->vcc ? rulla->vcc->vci : 0,
1442				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1443				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1444				  rulla->last_used,
1445				  rulla->timestamp, rulla->no_tries);
1446		offset += sprintf(buf + offset,
1447				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1448				  rulla->flags, rulla->packets_flooded,
1449				  get_status_string(rulla->status));
1450		pr_info("%s", buf);
1451	}
1452
1453	if (!hlist_empty(&priv->mcast_fwds))
1454		pr_info("Multicast Forward VCCs\n");
1455	hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1456		offset = 0;
1457		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1458		offset += sprintf(buf + offset, " Atm:");
1459		for (j = 0; j < ATM_ESA_LEN; j++) {
1460			offset += sprintf(buf + offset, "%2.2x ",
1461					  rulla->atm_addr[j] & 0xff);
1462		}
1463		offset += sprintf(buf + offset,
1464				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1465				  rulla->vcc ? rulla->vcc->vpi : 0,
1466				  rulla->vcc ? rulla->vcc->vci : 0,
1467				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1468				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1469				  rulla->last_used,
1470				  rulla->timestamp, rulla->no_tries);
1471		offset += sprintf(buf + offset,
1472				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1473				  rulla->flags, rulla->packets_flooded,
1474				  get_status_string(rulla->status));
1475		pr_info("%s\n", buf);
1476	}
1477
1478}
1479#else
1480#define dump_arp_table(priv) do { } while (0)
1481#endif
1482
1483/*
1484 * Destruction of arp-cache
1485 */
1486static void lec_arp_destroy(struct lec_priv *priv)
1487{
1488	unsigned long flags;
1489	struct hlist_node *next;
1490	struct lec_arp_table *entry;
1491	int i;
1492
1493	cancel_delayed_work_sync(&priv->lec_arp_work);
1494
1495	/*
1496	 * Remove all entries
1497	 */
1498
1499	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1500	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1501		hlist_for_each_entry_safe(entry, next,
1502					  &priv->lec_arp_tables[i], next) {
1503			lec_arp_remove(priv, entry);
1504			lec_arp_put(entry);
1505		}
1506		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1507	}
1508
1509	hlist_for_each_entry_safe(entry, next,
1510				  &priv->lec_arp_empty_ones, next) {
1511		del_timer_sync(&entry->timer);
1512		lec_arp_clear_vccs(entry);
1513		hlist_del(&entry->next);
1514		lec_arp_put(entry);
1515	}
1516	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1517
1518	hlist_for_each_entry_safe(entry, next,
1519				  &priv->lec_no_forward, next) {
1520		del_timer_sync(&entry->timer);
1521		lec_arp_clear_vccs(entry);
1522		hlist_del(&entry->next);
1523		lec_arp_put(entry);
1524	}
1525	INIT_HLIST_HEAD(&priv->lec_no_forward);
1526
1527	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1528		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1529		lec_arp_clear_vccs(entry);
1530		hlist_del(&entry->next);
1531		lec_arp_put(entry);
1532	}
1533	INIT_HLIST_HEAD(&priv->mcast_fwds);
1534	priv->mcast_vcc = NULL;
1535	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1536}
1537
1538/*
1539 * Find entry by mac_address
1540 */
1541static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1542					  const unsigned char *mac_addr)
1543{
1544	struct hlist_head *head;
1545	struct lec_arp_table *entry;
1546
1547	pr_debug("%pM\n", mac_addr);
1548
1549	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1550	hlist_for_each_entry(entry, head, next) {
1551		if (ether_addr_equal(mac_addr, entry->mac_addr))
1552			return entry;
1553	}
1554	return NULL;
1555}
1556
1557static struct lec_arp_table *make_entry(struct lec_priv *priv,
1558					const unsigned char *mac_addr)
1559{
1560	struct lec_arp_table *to_return;
1561
1562	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1563	if (!to_return) {
1564		pr_info("LEC: Arp entry kmalloc failed\n");
1565		return NULL;
1566	}
1567	ether_addr_copy(to_return->mac_addr, mac_addr);
1568	INIT_HLIST_NODE(&to_return->next);
1569	setup_timer(&to_return->timer, lec_arp_expire_arp,
1570			(unsigned long)to_return);
1571	to_return->last_used = jiffies;
1572	to_return->priv = priv;
1573	skb_queue_head_init(&to_return->tx_wait);
1574	atomic_set(&to_return->usage, 1);
1575	return to_return;
1576}
1577
1578/* Arp sent timer expired */
1579static void lec_arp_expire_arp(unsigned long data)
1580{
1581	struct lec_arp_table *entry;
1582
1583	entry = (struct lec_arp_table *)data;
1584
1585	pr_debug("\n");
1586	if (entry->status == ESI_ARP_PENDING) {
1587		if (entry->no_tries <= entry->priv->max_retry_count) {
1588			if (entry->is_rdesc)
1589				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1590					     entry->mac_addr, NULL, NULL);
1591			else
1592				send_to_lecd(entry->priv, l_arp_xmt,
1593					     entry->mac_addr, NULL, NULL);
1594			entry->no_tries++;
1595		}
1596		mod_timer(&entry->timer, jiffies + (1 * HZ));
1597	}
1598}
1599
1600/* Unknown/unused vcc expire, remove associated entry */
1601static void lec_arp_expire_vcc(unsigned long data)
1602{
1603	unsigned long flags;
1604	struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1605	struct lec_priv *priv = to_remove->priv;
1606
1607	del_timer(&to_remove->timer);
1608
1609	pr_debug("%p %p: vpi:%d vci:%d\n",
1610		 to_remove, priv,
1611		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1612		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1613
1614	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1615	hlist_del(&to_remove->next);
1616	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1617
1618	lec_arp_clear_vccs(to_remove);
1619	lec_arp_put(to_remove);
1620}
1621
1622static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1623				   unsigned long now,
1624				   struct lec_priv *priv)
1625{
1626	unsigned long time_to_check;
1627
1628	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1629		time_to_check = priv->forward_delay_time;
1630	else
1631		time_to_check = priv->aging_time;
1632
1633	pr_debug("About to expire: %lx - %lx > %lx\n",
1634		 now, entry->last_used, time_to_check);
1635	if (time_after(now, entry->last_used + time_to_check) &&
1636	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1637	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1638		/* Remove entry */
1639		pr_debug("Entry timed out\n");
1640		lec_arp_remove(priv, entry);
1641		lec_arp_put(entry);
1642	} else {
1643		/* Something else */
1644		if ((entry->status == ESI_VC_PENDING ||
1645		     entry->status == ESI_ARP_PENDING) &&
1646		    time_after_eq(now, entry->timestamp +
1647				       priv->max_unknown_frame_time)) {
1648			entry->timestamp = jiffies;
1649			entry->packets_flooded = 0;
1650			if (entry->status == ESI_VC_PENDING)
1651				send_to_lecd(priv, l_svc_setup,
1652					     entry->mac_addr,
1653					     entry->atm_addr,
1654					     NULL);
1655		}
1656		if (entry->status == ESI_FLUSH_PENDING &&
1657		    time_after_eq(now, entry->timestamp +
1658				       priv->path_switching_delay)) {
1659			lec_arp_hold(entry);
1660			return true;
1661		}
1662	}
1663
1664	return false;
1665}
1666/*
1667 * Expire entries.
1668 * 1. Re-set timer
1669 * 2. For each entry, delete entries that have aged past the age limit.
1670 * 3. For each entry, depending on the status of the entry, perform
1671 *    the following maintenance.
1672 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1673 *       tick_count is above the max_unknown_frame_time, clear
1674 *       the tick_count to zero and clear the packets_flooded counter
1675 *       to zero. This supports the packet rate limit per address
1676 *       while flooding unknowns.
1677 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1678 *       than or equal to the path_switching_delay, change the status
1679 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1680 *       regardless of the progress of the flush protocol.
1681 */
1682static void lec_arp_check_expire(struct work_struct *work)
1683{
1684	unsigned long flags;
1685	struct lec_priv *priv =
1686		container_of(work, struct lec_priv, lec_arp_work.work);
1687	struct hlist_node *next;
1688	struct lec_arp_table *entry;
1689	unsigned long now;
1690	int i;
1691
1692	pr_debug("%p\n", priv);
1693	now = jiffies;
1694restart:
1695	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1696	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1697		hlist_for_each_entry_safe(entry, next,
1698					  &priv->lec_arp_tables[i], next) {
1699			if (__lec_arp_check_expire(entry, now, priv)) {
1700				struct sk_buff *skb;
1701				struct atm_vcc *vcc = entry->vcc;
1702
1703				spin_unlock_irqrestore(&priv->lec_arp_lock,
1704						       flags);
1705				while ((skb = skb_dequeue(&entry->tx_wait)))
1706					lec_send(vcc, skb);
1707				entry->last_used = jiffies;
1708				entry->status = ESI_FORWARD_DIRECT;
1709				lec_arp_put(entry);
1710
1711				goto restart;
1712			}
1713		}
1714	}
1715	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1716
1717	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1718}
1719
1720/*
1721 * Try to find vcc where mac_address is attached.
1722 *
1723 */
1724static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1725				       const unsigned char *mac_to_find,
1726				       int is_rdesc,
1727				       struct lec_arp_table **ret_entry)
1728{
1729	unsigned long flags;
1730	struct lec_arp_table *entry;
1731	struct atm_vcc *found;
1732
1733	if (mac_to_find[0] & 0x01) {
1734		switch (priv->lane_version) {
1735		case 1:
1736			return priv->mcast_vcc;
1737		case 2:	/* LANE2 wants arp for multicast addresses */
1738			if (ether_addr_equal(mac_to_find, bus_mac))
1739				return priv->mcast_vcc;
1740			break;
1741		default:
1742			break;
1743		}
1744	}
1745
1746	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1747	entry = lec_arp_find(priv, mac_to_find);
1748
1749	if (entry) {
1750		if (entry->status == ESI_FORWARD_DIRECT) {
1751			/* Connection Ok */
1752			entry->last_used = jiffies;
1753			lec_arp_hold(entry);
1754			*ret_entry = entry;
1755			found = entry->vcc;
1756			goto out;
1757		}
1758		/*
1759		 * If the LE_ARP cache entry is still pending, reset count to 0
1760		 * so another LE_ARP request can be made for this frame.
1761		 */
1762		if (entry->status == ESI_ARP_PENDING)
1763			entry->no_tries = 0;
1764		/*
1765		 * Data direct VC not yet set up, check to see if the unknown
1766		 * frame count is greater than the limit. If the limit has
1767		 * not been reached, allow the caller to send packet to
1768		 * BUS.
1769		 */
1770		if (entry->status != ESI_FLUSH_PENDING &&
1771		    entry->packets_flooded <
1772		    priv->maximum_unknown_frame_count) {
1773			entry->packets_flooded++;
1774			pr_debug("Flooding..\n");
1775			found = priv->mcast_vcc;
1776			goto out;
1777		}
1778		/*
1779		 * We got here because entry->status == ESI_FLUSH_PENDING
1780		 * or BUS flood limit was reached for an entry which is
1781		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1782		 */
1783		lec_arp_hold(entry);
1784		*ret_entry = entry;
1785		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1786			 entry->vcc);
1787		found = NULL;
1788	} else {
1789		/* No matching entry was found */
1790		entry = make_entry(priv, mac_to_find);
1791		pr_debug("Making entry\n");
1792		if (!entry) {
1793			found = priv->mcast_vcc;
1794			goto out;
1795		}
1796		lec_arp_add(priv, entry);
1797		/* We want arp-request(s) to be sent */
1798		entry->packets_flooded = 1;
1799		entry->status = ESI_ARP_PENDING;
1800		entry->no_tries = 1;
1801		entry->last_used = entry->timestamp = jiffies;
1802		entry->is_rdesc = is_rdesc;
1803		if (entry->is_rdesc)
1804			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1805				     NULL);
1806		else
1807			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1808		entry->timer.expires = jiffies + (1 * HZ);
1809		entry->timer.function = lec_arp_expire_arp;
1810		add_timer(&entry->timer);
1811		found = priv->mcast_vcc;
1812	}
1813
1814out:
1815	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1816	return found;
1817}
1818
1819static int
1820lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1821		unsigned long permanent)
1822{
1823	unsigned long flags;
1824	struct hlist_node *next;
1825	struct lec_arp_table *entry;
1826	int i;
1827
1828	pr_debug("\n");
1829	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1830	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1831		hlist_for_each_entry_safe(entry, next,
1832					  &priv->lec_arp_tables[i], next) {
1833			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1834			    (permanent ||
1835			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1836				lec_arp_remove(priv, entry);
1837				lec_arp_put(entry);
1838			}
1839			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1840			return 0;
1841		}
1842	}
1843	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1844	return -1;
1845}
1846
1847/*
1848 * Notifies:  Response to arp_request (atm_addr != NULL)
1849 */
1850static void
1851lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1852	       const unsigned char *atm_addr, unsigned long remoteflag,
1853	       unsigned int targetless_le_arp)
1854{
1855	unsigned long flags;
1856	struct hlist_node *next;
1857	struct lec_arp_table *entry, *tmp;
1858	int i;
1859
1860	pr_debug("%smac:%pM\n",
1861		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1862
1863	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1864	entry = lec_arp_find(priv, mac_addr);
1865	if (entry == NULL && targetless_le_arp)
1866		goto out;	/*
1867				 * LANE2: ignore targetless LE_ARPs for which
1868				 * we have no entry in the cache. 7.1.30
1869				 */
1870	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1871		hlist_for_each_entry_safe(entry, next,
1872					  &priv->lec_arp_empty_ones, next) {
1873			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1874				hlist_del(&entry->next);
1875				del_timer(&entry->timer);
1876				tmp = lec_arp_find(priv, mac_addr);
1877				if (tmp) {
1878					del_timer(&tmp->timer);
1879					tmp->status = ESI_FORWARD_DIRECT;
1880					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1881					tmp->vcc = entry->vcc;
1882					tmp->old_push = entry->old_push;
1883					tmp->last_used = jiffies;
1884					del_timer(&entry->timer);
1885					lec_arp_put(entry);
1886					entry = tmp;
1887				} else {
1888					entry->status = ESI_FORWARD_DIRECT;
1889					ether_addr_copy(entry->mac_addr,
1890							mac_addr);
1891					entry->last_used = jiffies;
1892					lec_arp_add(priv, entry);
1893				}
1894				if (remoteflag)
1895					entry->flags |= LEC_REMOTE_FLAG;
1896				else
1897					entry->flags &= ~LEC_REMOTE_FLAG;
1898				pr_debug("After update\n");
1899				dump_arp_table(priv);
1900				goto out;
1901			}
1902		}
1903	}
1904
1905	entry = lec_arp_find(priv, mac_addr);
1906	if (!entry) {
1907		entry = make_entry(priv, mac_addr);
1908		if (!entry)
1909			goto out;
1910		entry->status = ESI_UNKNOWN;
1911		lec_arp_add(priv, entry);
1912		/* Temporary, changes before end of function */
1913	}
1914	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1915	del_timer(&entry->timer);
1916	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1917		hlist_for_each_entry(tmp,
1918				     &priv->lec_arp_tables[i], next) {
1919			if (entry != tmp &&
1920			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1921				/* Vcc to this host exists */
1922				if (tmp->status > ESI_VC_PENDING) {
1923					/*
1924					 * ESI_FLUSH_PENDING,
1925					 * ESI_FORWARD_DIRECT
1926					 */
1927					entry->vcc = tmp->vcc;
1928					entry->old_push = tmp->old_push;
1929				}
1930				entry->status = tmp->status;
1931				break;
1932			}
1933		}
1934	}
1935	if (remoteflag)
1936		entry->flags |= LEC_REMOTE_FLAG;
1937	else
1938		entry->flags &= ~LEC_REMOTE_FLAG;
1939	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1940		entry->status = ESI_VC_PENDING;
1941		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1942	}
1943	pr_debug("After update2\n");
1944	dump_arp_table(priv);
1945out:
1946	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1947}
1948
1949/*
1950 * Notifies: Vcc setup ready
1951 */
1952static void
1953lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1954	      struct atm_vcc *vcc,
1955	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1956{
1957	unsigned long flags;
1958	struct lec_arp_table *entry;
1959	int i, found_entry = 0;
1960
1961	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1962	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1963	if (ioc_data->receive == 2) {
1964		pr_debug("LEC_ARP: Attaching mcast forward\n");
1965#if 0
1966		entry = lec_arp_find(priv, bus_mac);
1967		if (!entry) {
1968			pr_info("LEC_ARP: Multicast entry not found!\n");
1969			goto out;
1970		}
1971		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1972		entry->recv_vcc = vcc;
1973		entry->old_recv_push = old_push;
1974#endif
1975		entry = make_entry(priv, bus_mac);
1976		if (entry == NULL)
1977			goto out;
1978		del_timer(&entry->timer);
1979		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1980		entry->recv_vcc = vcc;
1981		entry->old_recv_push = old_push;
1982		hlist_add_head(&entry->next, &priv->mcast_fwds);
1983		goto out;
1984	} else if (ioc_data->receive == 1) {
1985		/*
1986		 * Vcc which we don't want to make default vcc,
1987		 * attach it anyway.
1988		 */
1989		pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1990			 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1991			 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1992			 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1993			 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1994			 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1995			 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1996			 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1997			 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1998			 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1999			 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2000		entry = make_entry(priv, bus_mac);
2001		if (entry == NULL)
2002			goto out;
2003		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2004		eth_zero_addr(entry->mac_addr);
2005		entry->recv_vcc = vcc;
2006		entry->old_recv_push = old_push;
2007		entry->status = ESI_UNKNOWN;
2008		entry->timer.expires = jiffies + priv->vcc_timeout_period;
2009		entry->timer.function = lec_arp_expire_vcc;
2010		hlist_add_head(&entry->next, &priv->lec_no_forward);
2011		add_timer(&entry->timer);
2012		dump_arp_table(priv);
2013		goto out;
2014	}
2015	pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2016		 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2017		 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2018		 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2019		 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2020		 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2021		 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2022		 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2023		 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2024		 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2025		 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2026	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2027		hlist_for_each_entry(entry,
2028				     &priv->lec_arp_tables[i], next) {
2029			if (memcmp
2030			    (ioc_data->atm_addr, entry->atm_addr,
2031			     ATM_ESA_LEN) == 0) {
2032				pr_debug("LEC_ARP: Attaching data direct\n");
2033				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2034					 entry->vcc ? entry->vcc->vci : 0,
2035					 entry->recv_vcc ? entry->recv_vcc->
2036					 vci : 0);
2037				found_entry = 1;
2038				del_timer(&entry->timer);
2039				entry->vcc = vcc;
2040				entry->old_push = old_push;
2041				if (entry->status == ESI_VC_PENDING) {
2042					if (priv->maximum_unknown_frame_count
2043					    == 0)
2044						entry->status =
2045						    ESI_FORWARD_DIRECT;
2046					else {
2047						entry->timestamp = jiffies;
2048						entry->status =
2049						    ESI_FLUSH_PENDING;
2050#if 0
2051						send_to_lecd(priv, l_flush_xmt,
2052							     NULL,
2053							     entry->atm_addr,
2054							     NULL);
2055#endif
2056					}
2057				} else {
2058					/*
2059					 * They were forming a connection
2060					 * to us, and we to them. Our
2061					 * ATM address is numerically lower
2062					 * than theirs, so we make connection
2063					 * we formed into default VCC (8.1.11).
2064					 * Connection they made gets torn
2065					 * down. This might confuse some
2066					 * clients. Can be changed if
2067					 * someone reports trouble...
2068					 */
2069					;
2070				}
2071			}
2072		}
2073	}
2074	if (found_entry) {
2075		pr_debug("After vcc was added\n");
2076		dump_arp_table(priv);
2077		goto out;
2078	}
2079	/*
2080	 * Not found, snatch address from first data packet that arrives
2081	 * from this vcc
2082	 */
2083	entry = make_entry(priv, bus_mac);
2084	if (!entry)
2085		goto out;
2086	entry->vcc = vcc;
2087	entry->old_push = old_push;
2088	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2089	eth_zero_addr(entry->mac_addr);
2090	entry->status = ESI_UNKNOWN;
2091	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2092	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2093	entry->timer.function = lec_arp_expire_vcc;
2094	add_timer(&entry->timer);
2095	pr_debug("After vcc was added\n");
2096	dump_arp_table(priv);
2097out:
2098	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2099}
2100
2101static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2102{
2103	unsigned long flags;
2104	struct lec_arp_table *entry;
2105	int i;
2106
2107	pr_debug("%lx\n", tran_id);
2108restart:
2109	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2110	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2111		hlist_for_each_entry(entry,
2112				     &priv->lec_arp_tables[i], next) {
2113			if (entry->flush_tran_id == tran_id &&
2114			    entry->status == ESI_FLUSH_PENDING) {
2115				struct sk_buff *skb;
2116				struct atm_vcc *vcc = entry->vcc;
2117
2118				lec_arp_hold(entry);
2119				spin_unlock_irqrestore(&priv->lec_arp_lock,
2120						       flags);
2121				while ((skb = skb_dequeue(&entry->tx_wait)))
2122					lec_send(vcc, skb);
2123				entry->last_used = jiffies;
2124				entry->status = ESI_FORWARD_DIRECT;
2125				lec_arp_put(entry);
2126				pr_debug("LEC_ARP: Flushed\n");
2127				goto restart;
2128			}
2129		}
2130	}
2131	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2132	dump_arp_table(priv);
2133}
2134
2135static void
2136lec_set_flush_tran_id(struct lec_priv *priv,
2137		      const unsigned char *atm_addr, unsigned long tran_id)
2138{
2139	unsigned long flags;
2140	struct lec_arp_table *entry;
2141	int i;
2142
2143	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2144	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2145		hlist_for_each_entry(entry,
2146				     &priv->lec_arp_tables[i], next) {
2147			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2148				entry->flush_tran_id = tran_id;
2149				pr_debug("Set flush transaction id to %lx for %p\n",
2150					 tran_id, entry);
2151			}
2152		}
2153	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2154}
2155
2156static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2157{
2158	unsigned long flags;
2159	unsigned char mac_addr[] = {
2160		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2161	};
2162	struct lec_arp_table *to_add;
2163	struct lec_vcc_priv *vpriv;
2164	int err = 0;
2165
2166	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2167	if (!vpriv)
2168		return -ENOMEM;
2169	vpriv->xoff = 0;
2170	vpriv->old_pop = vcc->pop;
2171	vcc->user_back = vpriv;
2172	vcc->pop = lec_pop;
2173	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2174	to_add = make_entry(priv, mac_addr);
2175	if (!to_add) {
2176		vcc->pop = vpriv->old_pop;
2177		kfree(vpriv);
2178		err = -ENOMEM;
2179		goto out;
2180	}
2181	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2182	to_add->status = ESI_FORWARD_DIRECT;
2183	to_add->flags |= LEC_PERMANENT_FLAG;
2184	to_add->vcc = vcc;
2185	to_add->old_push = vcc->push;
2186	vcc->push = lec_push;
2187	priv->mcast_vcc = vcc;
2188	lec_arp_add(priv, to_add);
2189out:
2190	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2191	return err;
2192}
2193
2194static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2195{
2196	unsigned long flags;
2197	struct hlist_node *next;
2198	struct lec_arp_table *entry;
2199	int i;
2200
2201	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2202	dump_arp_table(priv);
2203
2204	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2205
2206	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2207		hlist_for_each_entry_safe(entry, next,
2208					  &priv->lec_arp_tables[i], next) {
2209			if (vcc == entry->vcc) {
2210				lec_arp_remove(priv, entry);
2211				lec_arp_put(entry);
2212				if (priv->mcast_vcc == vcc)
2213					priv->mcast_vcc = NULL;
2214			}
2215		}
2216	}
2217
2218	hlist_for_each_entry_safe(entry, next,
2219				  &priv->lec_arp_empty_ones, next) {
2220		if (entry->vcc == vcc) {
2221			lec_arp_clear_vccs(entry);
2222			del_timer(&entry->timer);
2223			hlist_del(&entry->next);
2224			lec_arp_put(entry);
2225		}
2226	}
2227
2228	hlist_for_each_entry_safe(entry, next,
2229				  &priv->lec_no_forward, next) {
2230		if (entry->recv_vcc == vcc) {
2231			lec_arp_clear_vccs(entry);
2232			del_timer(&entry->timer);
2233			hlist_del(&entry->next);
2234			lec_arp_put(entry);
2235		}
2236	}
2237
2238	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2239		if (entry->recv_vcc == vcc) {
2240			lec_arp_clear_vccs(entry);
2241			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2242			hlist_del(&entry->next);
2243			lec_arp_put(entry);
2244		}
2245	}
2246
2247	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2248	dump_arp_table(priv);
2249}
2250
2251static void
2252lec_arp_check_empties(struct lec_priv *priv,
2253		      struct atm_vcc *vcc, struct sk_buff *skb)
2254{
2255	unsigned long flags;
2256	struct hlist_node *next;
2257	struct lec_arp_table *entry, *tmp;
2258	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2259	unsigned char *src = hdr->h_source;
2260
2261	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2262	hlist_for_each_entry_safe(entry, next,
2263				  &priv->lec_arp_empty_ones, next) {
2264		if (vcc == entry->vcc) {
2265			del_timer(&entry->timer);
2266			ether_addr_copy(entry->mac_addr, src);
2267			entry->status = ESI_FORWARD_DIRECT;
2268			entry->last_used = jiffies;
2269			/* We might have got an entry */
2270			tmp = lec_arp_find(priv, src);
2271			if (tmp) {
2272				lec_arp_remove(priv, tmp);
2273				lec_arp_put(tmp);
2274			}
2275			hlist_del(&entry->next);
2276			lec_arp_add(priv, entry);
2277			goto out;
2278		}
2279	}
2280	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2281out:
2282	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2283}
2284
2285MODULE_LICENSE("GPL");