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 IS_ENABLED(CONFIG_BRIDGE)
  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	.resolve = lane2_resolve,		/* spec 3.1.3 */
 115	.associate_req = lane2_associate_req,	/* spec 3.1.4 */
 116	.associate_indicator = NULL             /* 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 IS_ENABLED(CONFIG_BRIDGE)
 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 /* IS_ENABLED(CONFIG_BRIDGE) */
 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	netif_trans_update(dev);
 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 IS_ENABLED(CONFIG_BRIDGE)
 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	netif_trans_update(dev);
 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 IS_ENABLED(CONFIG_BRIDGE)
 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 /* IS_ENABLED(CONFIG_BRIDGE) */
 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
 547static void lec_set_multicast_list(struct net_device *dev)
 548{
 549	/*
 550	 * by default, all multicast frames arrive over the bus.
 551	 * eventually support selective multicast service
 552	 */
 553}
 554
 555static const struct net_device_ops lec_netdev_ops = {
 556	.ndo_open		= lec_open,
 557	.ndo_stop		= lec_close,
 558	.ndo_start_xmit		= lec_start_xmit,
 559	.ndo_tx_timeout		= lec_tx_timeout,
 560	.ndo_set_rx_mode	= lec_set_multicast_list,
 561};
 562
 563static const unsigned char lec_ctrl_magic[] = {
 564	0xff,
 565	0x00,
 566	0x01,
 567	0x01
 568};
 569
 570#define LEC_DATA_DIRECT_8023  2
 571#define LEC_DATA_DIRECT_8025  3
 572
 573static int lec_is_data_direct(struct atm_vcc *vcc)
 574{
 575	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 576		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 577}
 578
 579static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 580{
 581	unsigned long flags;
 582	struct net_device *dev = (struct net_device *)vcc->proto_data;
 583	struct lec_priv *priv = netdev_priv(dev);
 584
 585#if DUMP_PACKETS > 0
 586	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 587	       dev->name, vcc->vpi, vcc->vci);
 588#endif
 589	if (!skb) {
 590		pr_debug("%s: null skb\n", dev->name);
 591		lec_vcc_close(priv, vcc);
 592		return;
 593	}
 594#if DUMP_PACKETS >= 2
 595#define MAX_SKB_DUMP 99
 596#elif DUMP_PACKETS >= 1
 597#define MAX_SKB_DUMP 30
 598#endif
 599#if DUMP_PACKETS > 0
 600	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 601	       dev->name, skb->len, priv->lecid);
 602	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 603		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 604#endif /* DUMP_PACKETS > 0 */
 605	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 606				/* Control frame, to daemon */
 607		struct sock *sk = sk_atm(vcc);
 608
 609		pr_debug("%s: To daemon\n", dev->name);
 610		skb_queue_tail(&sk->sk_receive_queue, skb);
 611		sk->sk_data_ready(sk);
 612	} else {		/* Data frame, queue to protocol handlers */
 613		struct lec_arp_table *entry;
 614		unsigned char *src, *dst;
 615
 616		atm_return(vcc, skb->truesize);
 617		if (*(__be16 *) skb->data == htons(priv->lecid) ||
 618		    !priv->lecd || !(dev->flags & IFF_UP)) {
 619			/*
 620			 * Probably looping back, or if lecd is missing,
 621			 * lecd has gone down
 622			 */
 623			pr_debug("Ignoring frame...\n");
 624			dev_kfree_skb(skb);
 625			return;
 626		}
 627		dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 628
 629		/*
 630		 * If this is a Data Direct VCC, and the VCC does not match
 631		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 632		 */
 633		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 634		if (lec_is_data_direct(vcc)) {
 635			src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 636			entry = lec_arp_find(priv, src);
 637			if (entry && entry->vcc != vcc) {
 638				lec_arp_remove(priv, entry);
 639				lec_arp_put(entry);
 640			}
 641		}
 642		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 643
 644		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
 645		    !priv->is_proxy &&	/* Proxy wants all the packets */
 646		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 647			dev_kfree_skb(skb);
 648			return;
 649		}
 650		if (!hlist_empty(&priv->lec_arp_empty_ones))
 651			lec_arp_check_empties(priv, vcc, skb);
 652		skb_pull(skb, 2);	/* skip lec_id */
 653		skb->protocol = eth_type_trans(skb, dev);
 654		dev->stats.rx_packets++;
 655		dev->stats.rx_bytes += skb->len;
 656		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 657		netif_rx(skb);
 658	}
 659}
 660
 661static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 662{
 663	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 664	struct net_device *dev = skb->dev;
 665
 666	if (vpriv == NULL) {
 667		pr_info("vpriv = NULL!?!?!?\n");
 668		return;
 669	}
 670
 671	vpriv->old_pop(vcc, skb);
 672
 673	if (vpriv->xoff && atm_may_send(vcc, 0)) {
 674		vpriv->xoff = 0;
 675		if (netif_running(dev) && netif_queue_stopped(dev))
 676			netif_wake_queue(dev);
 677	}
 678}
 679
 680static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 681{
 682	struct lec_vcc_priv *vpriv;
 683	int bytes_left;
 684	struct atmlec_ioc ioc_data;
 685
 686	/* Lecd must be up in this case */
 687	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 688	if (bytes_left != 0)
 689		pr_info("copy from user failed for %d bytes\n", bytes_left);
 690	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 691	    !dev_lec[ioc_data.dev_num])
 
 
 692		return -EINVAL;
 693	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 694	if (!vpriv)
 695		return -ENOMEM;
 696	vpriv->xoff = 0;
 697	vpriv->old_pop = vcc->pop;
 698	vcc->user_back = vpriv;
 699	vcc->pop = lec_pop;
 700	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 701		      &ioc_data, vcc, vcc->push);
 702	vcc->proto_data = dev_lec[ioc_data.dev_num];
 703	vcc->push = lec_push;
 704	return 0;
 705}
 706
 707static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 708{
 709	if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 
 
 
 710		return -EINVAL;
 711	vcc->proto_data = dev_lec[arg];
 712	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 713}
 714
 715/* Initialize device. */
 716static int lecd_attach(struct atm_vcc *vcc, int arg)
 717{
 718	int i;
 719	struct lec_priv *priv;
 720
 721	if (arg < 0)
 722		i = 0;
 723	else
 724		i = arg;
 725	if (arg >= MAX_LEC_ITF)
 726		return -EINVAL;
 
 727	if (!dev_lec[i]) {
 728		int size;
 729
 730		size = sizeof(struct lec_priv);
 731		dev_lec[i] = alloc_etherdev(size);
 732		if (!dev_lec[i])
 733			return -ENOMEM;
 734		dev_lec[i]->netdev_ops = &lec_netdev_ops;
 735		dev_lec[i]->max_mtu = 18190;
 736		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 737		if (register_netdev(dev_lec[i])) {
 738			free_netdev(dev_lec[i]);
 739			return -EINVAL;
 740		}
 741
 742		priv = netdev_priv(dev_lec[i]);
 743	} else {
 744		priv = netdev_priv(dev_lec[i]);
 745		if (priv->lecd)
 746			return -EADDRINUSE;
 747	}
 748	lec_arp_init(priv);
 749	priv->itfnum = i;	/* LANE2 addition */
 750	priv->lecd = vcc;
 751	vcc->dev = &lecatm_dev;
 752	vcc_insert_socket(sk_atm(vcc));
 753
 754	vcc->proto_data = dev_lec[i];
 755	set_bit(ATM_VF_META, &vcc->flags);
 756	set_bit(ATM_VF_READY, &vcc->flags);
 757
 758	/* Set default values to these variables */
 759	priv->maximum_unknown_frame_count = 1;
 760	priv->max_unknown_frame_time = (1 * HZ);
 761	priv->vcc_timeout_period = (1200 * HZ);
 762	priv->max_retry_count = 1;
 763	priv->aging_time = (300 * HZ);
 764	priv->forward_delay_time = (15 * HZ);
 765	priv->topology_change = 0;
 766	priv->arp_response_time = (1 * HZ);
 767	priv->flush_timeout = (4 * HZ);
 768	priv->path_switching_delay = (6 * HZ);
 769
 770	if (dev_lec[i]->flags & IFF_UP)
 771		netif_start_queue(dev_lec[i]);
 772	__module_get(THIS_MODULE);
 773	return i;
 774}
 775
 776#ifdef CONFIG_PROC_FS
 777static const char *lec_arp_get_status_string(unsigned char status)
 778{
 779	static const char *const lec_arp_status_string[] = {
 780		"ESI_UNKNOWN       ",
 781		"ESI_ARP_PENDING   ",
 782		"ESI_VC_PENDING    ",
 783		"<Undefined>       ",
 784		"ESI_FLUSH_PENDING ",
 785		"ESI_FORWARD_DIRECT"
 786	};
 787
 788	if (status > ESI_FORWARD_DIRECT)
 789		status = 3;	/* ESI_UNDEFINED */
 790	return lec_arp_status_string[status];
 791}
 792
 793static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 794{
 795	int i;
 796
 797	for (i = 0; i < ETH_ALEN; i++)
 798		seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 799	seq_printf(seq, " ");
 800	for (i = 0; i < ATM_ESA_LEN; i++)
 801		seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 802	seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 803		   entry->flags & 0xffff);
 804	if (entry->vcc)
 805		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 806	else
 807		seq_printf(seq, "        ");
 808	if (entry->recv_vcc) {
 809		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 810			   entry->recv_vcc->vci);
 811	}
 812	seq_putc(seq, '\n');
 813}
 814
 815struct lec_state {
 816	unsigned long flags;
 817	struct lec_priv *locked;
 818	struct hlist_node *node;
 819	struct net_device *dev;
 820	int itf;
 821	int arp_table;
 822	int misc_table;
 823};
 824
 825static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 826			  loff_t *l)
 827{
 828	struct hlist_node *e = state->node;
 829
 830	if (!e)
 831		e = tbl->first;
 832	if (e == SEQ_START_TOKEN) {
 833		e = tbl->first;
 834		--*l;
 835	}
 836
 837	for (; e; e = e->next) {
 838		if (--*l < 0)
 839			break;
 840	}
 841	state->node = e;
 842
 843	return (*l < 0) ? state : NULL;
 844}
 845
 846static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 847			  struct lec_priv *priv)
 848{
 849	void *v = NULL;
 850	int p;
 851
 852	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 853		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 854		if (v)
 855			break;
 856	}
 857	state->arp_table = p;
 858	return v;
 859}
 860
 861static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 862			   struct lec_priv *priv)
 863{
 864	struct hlist_head *lec_misc_tables[] = {
 865		&priv->lec_arp_empty_ones,
 866		&priv->lec_no_forward,
 867		&priv->mcast_fwds
 868	};
 869	void *v = NULL;
 870	int q;
 871
 872	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 873		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 874		if (v)
 875			break;
 876	}
 877	state->misc_table = q;
 878	return v;
 879}
 880
 881static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 882			   struct lec_priv *priv)
 883{
 884	if (!state->locked) {
 885		state->locked = priv;
 886		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 887	}
 888	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 889		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 890		state->locked = NULL;
 891		/* Partial state reset for the next time we get called */
 892		state->arp_table = state->misc_table = 0;
 893	}
 894	return state->locked;
 895}
 896
 897static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 898{
 899	struct net_device *dev;
 900	void *v;
 901
 902	dev = state->dev ? state->dev : dev_lec[state->itf];
 903	v = (dev && netdev_priv(dev)) ?
 904		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 905	if (!v && dev) {
 906		dev_put(dev);
 907		/* Partial state reset for the next time we get called */
 908		dev = NULL;
 909	}
 910	state->dev = dev;
 911	return v;
 912}
 913
 914static void *lec_get_idx(struct lec_state *state, loff_t l)
 915{
 916	void *v = NULL;
 917
 918	for (; state->itf < MAX_LEC_ITF; state->itf++) {
 919		v = lec_itf_walk(state, &l);
 920		if (v)
 921			break;
 922	}
 923	return v;
 924}
 925
 926static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 927{
 928	struct lec_state *state = seq->private;
 929
 930	state->itf = 0;
 931	state->dev = NULL;
 932	state->locked = NULL;
 933	state->arp_table = 0;
 934	state->misc_table = 0;
 935	state->node = SEQ_START_TOKEN;
 936
 937	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 938}
 939
 940static void lec_seq_stop(struct seq_file *seq, void *v)
 941{
 942	struct lec_state *state = seq->private;
 943
 944	if (state->dev) {
 945		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 946				       state->flags);
 947		dev_put(state->dev);
 948	}
 949}
 950
 951static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 952{
 953	struct lec_state *state = seq->private;
 954
 955	v = lec_get_idx(state, 1);
 956	*pos += !!PTR_ERR(v);
 957	return v;
 958}
 959
 960static int lec_seq_show(struct seq_file *seq, void *v)
 961{
 962	static const char lec_banner[] =
 963	    "Itf  MAC          ATM destination"
 964	    "                          Status            Flags "
 965	    "VPI/VCI Recv VPI/VCI\n";
 966
 967	if (v == SEQ_START_TOKEN)
 968		seq_puts(seq, lec_banner);
 969	else {
 970		struct lec_state *state = seq->private;
 971		struct net_device *dev = state->dev;
 972		struct lec_arp_table *entry = hlist_entry(state->node,
 973							  struct lec_arp_table,
 974							  next);
 975
 976		seq_printf(seq, "%s ", dev->name);
 977		lec_info(seq, entry);
 978	}
 979	return 0;
 980}
 981
 982static const struct seq_operations lec_seq_ops = {
 983	.start = lec_seq_start,
 984	.next = lec_seq_next,
 985	.stop = lec_seq_stop,
 986	.show = lec_seq_show,
 987};
 988
 989static int lec_seq_open(struct inode *inode, struct file *file)
 990{
 991	return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
 992}
 993
 994static const struct file_operations lec_seq_fops = {
 995	.owner = THIS_MODULE,
 996	.open = lec_seq_open,
 997	.read = seq_read,
 998	.llseek = seq_lseek,
 999	.release = seq_release_private,
1000};
1001#endif
1002
1003static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1004{
1005	struct atm_vcc *vcc = ATM_SD(sock);
1006	int err = 0;
1007
1008	switch (cmd) {
1009	case ATMLEC_CTRL:
1010	case ATMLEC_MCAST:
1011	case ATMLEC_DATA:
1012		if (!capable(CAP_NET_ADMIN))
1013			return -EPERM;
1014		break;
1015	default:
1016		return -ENOIOCTLCMD;
1017	}
1018
1019	switch (cmd) {
1020	case ATMLEC_CTRL:
1021		err = lecd_attach(vcc, (int)arg);
1022		if (err >= 0)
1023			sock->state = SS_CONNECTED;
1024		break;
1025	case ATMLEC_MCAST:
1026		err = lec_mcast_attach(vcc, (int)arg);
1027		break;
1028	case ATMLEC_DATA:
1029		err = lec_vcc_attach(vcc, (void __user *)arg);
1030		break;
1031	}
1032
1033	return err;
1034}
1035
1036static struct atm_ioctl lane_ioctl_ops = {
1037	.owner = THIS_MODULE,
1038	.ioctl = lane_ioctl,
1039};
1040
1041static int __init lane_module_init(void)
1042{
1043#ifdef CONFIG_PROC_FS
1044	struct proc_dir_entry *p;
1045
1046	p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
 
1047	if (!p) {
1048		pr_err("Unable to initialize /proc/net/atm/lec\n");
1049		return -ENOMEM;
1050	}
1051#endif
1052
1053	register_atm_ioctl(&lane_ioctl_ops);
1054	pr_info("lec.c: initialized\n");
1055	return 0;
1056}
1057
1058static void __exit lane_module_cleanup(void)
1059{
1060	int i;
1061
1062#ifdef CONFIG_PROC_FS
1063	remove_proc_entry("lec", atm_proc_root);
1064#endif
1065
1066	deregister_atm_ioctl(&lane_ioctl_ops);
1067
1068	for (i = 0; i < MAX_LEC_ITF; i++) {
1069		if (dev_lec[i] != NULL) {
1070			unregister_netdev(dev_lec[i]);
1071			free_netdev(dev_lec[i]);
1072			dev_lec[i] = NULL;
1073		}
1074	}
1075}
1076
1077module_init(lane_module_init);
1078module_exit(lane_module_cleanup);
1079
1080/*
1081 * LANE2: 3.1.3, LE_RESOLVE.request
1082 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1083 * If sizeoftlvs == NULL the default TLVs associated with with this
1084 * lec will be used.
1085 * If dst_mac == NULL, targetless LE_ARP will be sent
1086 */
1087static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1088			 u8 **tlvs, u32 *sizeoftlvs)
1089{
1090	unsigned long flags;
1091	struct lec_priv *priv = netdev_priv(dev);
1092	struct lec_arp_table *table;
1093	struct sk_buff *skb;
1094	int retval;
1095
1096	if (force == 0) {
1097		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1098		table = lec_arp_find(priv, dst_mac);
1099		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1100		if (table == NULL)
1101			return -1;
1102
1103		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1104		if (*tlvs == NULL)
1105			return -1;
1106
1107		*sizeoftlvs = table->sizeoftlvs;
1108
1109		return 0;
1110	}
1111
1112	if (sizeoftlvs == NULL)
1113		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1114
1115	else {
1116		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1117		if (skb == NULL)
1118			return -1;
1119		skb->len = *sizeoftlvs;
1120		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1121		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1122	}
1123	return retval;
1124}
1125
1126/*
1127 * LANE2: 3.1.4, LE_ASSOCIATE.request
1128 * Associate the *tlvs with the *lan_dst address.
1129 * Will overwrite any previous association
1130 * Returns 1 for success, 0 for failure (out of memory)
1131 *
1132 */
1133static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1134			       const u8 *tlvs, u32 sizeoftlvs)
1135{
1136	int retval;
1137	struct sk_buff *skb;
1138	struct lec_priv *priv = netdev_priv(dev);
1139
1140	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1141		return 0;	/* not our mac address */
1142
1143	kfree(priv->tlvs);	/* NULL if there was no previous association */
1144
1145	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1146	if (priv->tlvs == NULL)
1147		return 0;
1148	priv->sizeoftlvs = sizeoftlvs;
1149
1150	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1151	if (skb == NULL)
1152		return 0;
1153	skb->len = sizeoftlvs;
1154	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1155	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1156	if (retval != 0)
1157		pr_info("lec.c: lane2_associate_req() failed\n");
1158	/*
1159	 * If the previous association has changed we must
1160	 * somehow notify other LANE entities about the change
1161	 */
1162	return 1;
1163}
1164
1165/*
1166 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1167 *
1168 */
1169static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1170				const u8 *tlvs, u32 sizeoftlvs)
1171{
1172#if 0
1173	int i = 0;
1174#endif
1175	struct lec_priv *priv = netdev_priv(dev);
1176#if 0				/*
1177				 * Why have the TLVs in LE_ARP entries
1178				 * since we do not use them? When you
1179				 * uncomment this code, make sure the
1180				 * TLVs get freed when entry is killed
1181				 */
1182	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1183
1184	if (entry == NULL)
1185		return;		/* should not happen */
1186
1187	kfree(entry->tlvs);
1188
1189	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1190	if (entry->tlvs == NULL)
1191		return;
1192	entry->sizeoftlvs = sizeoftlvs;
1193#endif
1194#if 0
1195	pr_info("\n");
1196	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1197	while (i < sizeoftlvs)
1198		pr_cont("%02x ", tlvs[i++]);
1199
1200	pr_cont("\n");
1201#endif
1202
1203	/* tell MPOA about the TLVs we saw */
1204	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1205		priv->lane2_ops->associate_indicator(dev, mac_addr,
1206						     tlvs, sizeoftlvs);
1207	}
1208}
1209
1210/*
1211 * Here starts what used to lec_arpc.c
1212 *
1213 * lec_arpc.c was added here when making
1214 * lane client modular. October 1997
1215 */
1216
1217#include <linux/types.h>
1218#include <linux/timer.h>
1219#include <linux/param.h>
1220#include <linux/atomic.h>
1221#include <linux/inetdevice.h>
1222#include <net/route.h>
1223
1224#if 0
1225#define pr_debug(format, args...)
1226/*
1227  #define pr_debug printk
1228*/
1229#endif
1230#define DEBUG_ARP_TABLE 0
1231
1232#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1233
1234static void lec_arp_check_expire(struct work_struct *work);
1235static void lec_arp_expire_arp(unsigned long data);
1236
1237/*
1238 * Arp table funcs
1239 */
1240
1241#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1242
1243/*
1244 * Initialization of arp-cache
1245 */
1246static void lec_arp_init(struct lec_priv *priv)
1247{
1248	unsigned short i;
1249
1250	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1251		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1252	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1253	INIT_HLIST_HEAD(&priv->lec_no_forward);
1254	INIT_HLIST_HEAD(&priv->mcast_fwds);
1255	spin_lock_init(&priv->lec_arp_lock);
1256	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1257	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1258}
1259
1260static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1261{
1262	if (entry->vcc) {
1263		struct atm_vcc *vcc = entry->vcc;
1264		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1265		struct net_device *dev = (struct net_device *)vcc->proto_data;
1266
1267		vcc->pop = vpriv->old_pop;
1268		if (vpriv->xoff)
1269			netif_wake_queue(dev);
1270		kfree(vpriv);
1271		vcc->user_back = NULL;
1272		vcc->push = entry->old_push;
1273		vcc_release_async(vcc, -EPIPE);
1274		entry->vcc = NULL;
1275	}
1276	if (entry->recv_vcc) {
1277		entry->recv_vcc->push = entry->old_recv_push;
1278		vcc_release_async(entry->recv_vcc, -EPIPE);
1279		entry->recv_vcc = NULL;
1280	}
1281}
1282
1283/*
1284 * Insert entry to lec_arp_table
1285 * LANE2: Add to the end of the list to satisfy 8.1.13
1286 */
1287static inline void
1288lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1289{
1290	struct hlist_head *tmp;
1291
1292	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1293	hlist_add_head(&entry->next, tmp);
1294
1295	pr_debug("Added entry:%pM\n", entry->mac_addr);
1296}
1297
1298/*
1299 * Remove entry from lec_arp_table
1300 */
1301static int
1302lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1303{
1304	struct lec_arp_table *entry;
1305	int i, remove_vcc = 1;
1306
1307	if (!to_remove)
1308		return -1;
1309
1310	hlist_del(&to_remove->next);
1311	del_timer(&to_remove->timer);
1312
1313	/*
1314	 * If this is the only MAC connected to this VCC,
1315	 * also tear down the VCC
1316	 */
1317	if (to_remove->status >= ESI_FLUSH_PENDING) {
1318		/*
1319		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1320		 */
1321		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1322			hlist_for_each_entry(entry,
1323					     &priv->lec_arp_tables[i], next) {
1324				if (memcmp(to_remove->atm_addr,
1325					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1326					remove_vcc = 0;
1327					break;
1328				}
1329			}
1330		}
1331		if (remove_vcc)
1332			lec_arp_clear_vccs(to_remove);
1333	}
1334	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1335
1336	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1337	return 0;
1338}
1339
1340#if DEBUG_ARP_TABLE
1341static const char *get_status_string(unsigned char st)
1342{
1343	switch (st) {
1344	case ESI_UNKNOWN:
1345		return "ESI_UNKNOWN";
1346	case ESI_ARP_PENDING:
1347		return "ESI_ARP_PENDING";
1348	case ESI_VC_PENDING:
1349		return "ESI_VC_PENDING";
1350	case ESI_FLUSH_PENDING:
1351		return "ESI_FLUSH_PENDING";
1352	case ESI_FORWARD_DIRECT:
1353		return "ESI_FORWARD_DIRECT";
1354	}
1355	return "<UNKNOWN>";
1356}
1357
1358static void dump_arp_table(struct lec_priv *priv)
1359{
1360	struct lec_arp_table *rulla;
1361	char buf[256];
1362	int i, j, offset;
1363
1364	pr_info("Dump %p:\n", priv);
1365	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1366		hlist_for_each_entry(rulla,
1367				     &priv->lec_arp_tables[i], next) {
1368			offset = 0;
1369			offset += sprintf(buf, "%d: %p\n", i, rulla);
1370			offset += sprintf(buf + offset, "Mac: %pM",
1371					  rulla->mac_addr);
1372			offset += sprintf(buf + offset, " Atm:");
1373			for (j = 0; j < ATM_ESA_LEN; j++) {
1374				offset += sprintf(buf + offset,
1375						  "%2.2x ",
1376						  rulla->atm_addr[j] & 0xff);
1377			}
1378			offset += sprintf(buf + offset,
1379					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1380					  rulla->vcc ? rulla->vcc->vpi : 0,
1381					  rulla->vcc ? rulla->vcc->vci : 0,
1382					  rulla->recv_vcc ? rulla->recv_vcc->
1383					  vpi : 0,
1384					  rulla->recv_vcc ? rulla->recv_vcc->
1385					  vci : 0, rulla->last_used,
1386					  rulla->timestamp, rulla->no_tries);
1387			offset +=
1388			    sprintf(buf + offset,
1389				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1390				    rulla->flags, rulla->packets_flooded,
1391				    get_status_string(rulla->status));
1392			pr_info("%s\n", buf);
1393		}
1394	}
1395
1396	if (!hlist_empty(&priv->lec_no_forward))
1397		pr_info("No forward\n");
1398	hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1399		offset = 0;
1400		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1401		offset += sprintf(buf + offset, " Atm:");
1402		for (j = 0; j < ATM_ESA_LEN; j++) {
1403			offset += sprintf(buf + offset, "%2.2x ",
1404					  rulla->atm_addr[j] & 0xff);
1405		}
1406		offset += sprintf(buf + offset,
1407				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1408				  rulla->vcc ? rulla->vcc->vpi : 0,
1409				  rulla->vcc ? rulla->vcc->vci : 0,
1410				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1411				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1412				  rulla->last_used,
1413				  rulla->timestamp, rulla->no_tries);
1414		offset += sprintf(buf + offset,
1415				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1416				  rulla->flags, rulla->packets_flooded,
1417				  get_status_string(rulla->status));
1418		pr_info("%s\n", buf);
1419	}
1420
1421	if (!hlist_empty(&priv->lec_arp_empty_ones))
1422		pr_info("Empty ones\n");
1423	hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1424		offset = 0;
1425		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1426		offset += sprintf(buf + offset, " Atm:");
1427		for (j = 0; j < ATM_ESA_LEN; j++) {
1428			offset += sprintf(buf + offset, "%2.2x ",
1429					  rulla->atm_addr[j] & 0xff);
1430		}
1431		offset += sprintf(buf + offset,
1432				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1433				  rulla->vcc ? rulla->vcc->vpi : 0,
1434				  rulla->vcc ? rulla->vcc->vci : 0,
1435				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1436				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1437				  rulla->last_used,
1438				  rulla->timestamp, rulla->no_tries);
1439		offset += sprintf(buf + offset,
1440				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1441				  rulla->flags, rulla->packets_flooded,
1442				  get_status_string(rulla->status));
1443		pr_info("%s", buf);
1444	}
1445
1446	if (!hlist_empty(&priv->mcast_fwds))
1447		pr_info("Multicast Forward VCCs\n");
1448	hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1449		offset = 0;
1450		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1451		offset += sprintf(buf + offset, " Atm:");
1452		for (j = 0; j < ATM_ESA_LEN; j++) {
1453			offset += sprintf(buf + offset, "%2.2x ",
1454					  rulla->atm_addr[j] & 0xff);
1455		}
1456		offset += sprintf(buf + offset,
1457				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1458				  rulla->vcc ? rulla->vcc->vpi : 0,
1459				  rulla->vcc ? rulla->vcc->vci : 0,
1460				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1461				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1462				  rulla->last_used,
1463				  rulla->timestamp, rulla->no_tries);
1464		offset += sprintf(buf + offset,
1465				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1466				  rulla->flags, rulla->packets_flooded,
1467				  get_status_string(rulla->status));
1468		pr_info("%s\n", buf);
1469	}
1470
1471}
1472#else
1473#define dump_arp_table(priv) do { } while (0)
1474#endif
1475
1476/*
1477 * Destruction of arp-cache
1478 */
1479static void lec_arp_destroy(struct lec_priv *priv)
1480{
1481	unsigned long flags;
1482	struct hlist_node *next;
1483	struct lec_arp_table *entry;
1484	int i;
1485
1486	cancel_delayed_work_sync(&priv->lec_arp_work);
1487
1488	/*
1489	 * Remove all entries
1490	 */
1491
1492	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1493	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1494		hlist_for_each_entry_safe(entry, next,
1495					  &priv->lec_arp_tables[i], next) {
1496			lec_arp_remove(priv, entry);
1497			lec_arp_put(entry);
1498		}
1499		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1500	}
1501
1502	hlist_for_each_entry_safe(entry, next,
1503				  &priv->lec_arp_empty_ones, next) {
1504		del_timer_sync(&entry->timer);
1505		lec_arp_clear_vccs(entry);
1506		hlist_del(&entry->next);
1507		lec_arp_put(entry);
1508	}
1509	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1510
1511	hlist_for_each_entry_safe(entry, next,
1512				  &priv->lec_no_forward, next) {
1513		del_timer_sync(&entry->timer);
1514		lec_arp_clear_vccs(entry);
1515		hlist_del(&entry->next);
1516		lec_arp_put(entry);
1517	}
1518	INIT_HLIST_HEAD(&priv->lec_no_forward);
1519
1520	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1521		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1522		lec_arp_clear_vccs(entry);
1523		hlist_del(&entry->next);
1524		lec_arp_put(entry);
1525	}
1526	INIT_HLIST_HEAD(&priv->mcast_fwds);
1527	priv->mcast_vcc = NULL;
1528	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1529}
1530
1531/*
1532 * Find entry by mac_address
1533 */
1534static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1535					  const unsigned char *mac_addr)
1536{
1537	struct hlist_head *head;
1538	struct lec_arp_table *entry;
1539
1540	pr_debug("%pM\n", mac_addr);
1541
1542	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1543	hlist_for_each_entry(entry, head, next) {
1544		if (ether_addr_equal(mac_addr, entry->mac_addr))
1545			return entry;
1546	}
1547	return NULL;
1548}
1549
1550static struct lec_arp_table *make_entry(struct lec_priv *priv,
1551					const unsigned char *mac_addr)
1552{
1553	struct lec_arp_table *to_return;
1554
1555	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1556	if (!to_return) {
1557		pr_info("LEC: Arp entry kmalloc failed\n");
1558		return NULL;
1559	}
1560	ether_addr_copy(to_return->mac_addr, mac_addr);
1561	INIT_HLIST_NODE(&to_return->next);
1562	setup_timer(&to_return->timer, lec_arp_expire_arp,
1563			(unsigned long)to_return);
1564	to_return->last_used = jiffies;
1565	to_return->priv = priv;
1566	skb_queue_head_init(&to_return->tx_wait);
1567	atomic_set(&to_return->usage, 1);
1568	return to_return;
1569}
1570
1571/* Arp sent timer expired */
1572static void lec_arp_expire_arp(unsigned long data)
1573{
1574	struct lec_arp_table *entry;
1575
1576	entry = (struct lec_arp_table *)data;
1577
1578	pr_debug("\n");
1579	if (entry->status == ESI_ARP_PENDING) {
1580		if (entry->no_tries <= entry->priv->max_retry_count) {
1581			if (entry->is_rdesc)
1582				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1583					     entry->mac_addr, NULL, NULL);
1584			else
1585				send_to_lecd(entry->priv, l_arp_xmt,
1586					     entry->mac_addr, NULL, NULL);
1587			entry->no_tries++;
1588		}
1589		mod_timer(&entry->timer, jiffies + (1 * HZ));
1590	}
1591}
1592
1593/* Unknown/unused vcc expire, remove associated entry */
1594static void lec_arp_expire_vcc(unsigned long data)
1595{
1596	unsigned long flags;
1597	struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1598	struct lec_priv *priv = to_remove->priv;
1599
1600	del_timer(&to_remove->timer);
1601
1602	pr_debug("%p %p: vpi:%d vci:%d\n",
1603		 to_remove, priv,
1604		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1605		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1606
1607	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1608	hlist_del(&to_remove->next);
1609	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1610
1611	lec_arp_clear_vccs(to_remove);
1612	lec_arp_put(to_remove);
1613}
1614
1615static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1616				   unsigned long now,
1617				   struct lec_priv *priv)
1618{
1619	unsigned long time_to_check;
1620
1621	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1622		time_to_check = priv->forward_delay_time;
1623	else
1624		time_to_check = priv->aging_time;
1625
1626	pr_debug("About to expire: %lx - %lx > %lx\n",
1627		 now, entry->last_used, time_to_check);
1628	if (time_after(now, entry->last_used + time_to_check) &&
1629	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1630	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1631		/* Remove entry */
1632		pr_debug("Entry timed out\n");
1633		lec_arp_remove(priv, entry);
1634		lec_arp_put(entry);
1635	} else {
1636		/* Something else */
1637		if ((entry->status == ESI_VC_PENDING ||
1638		     entry->status == ESI_ARP_PENDING) &&
1639		    time_after_eq(now, entry->timestamp +
1640				       priv->max_unknown_frame_time)) {
1641			entry->timestamp = jiffies;
1642			entry->packets_flooded = 0;
1643			if (entry->status == ESI_VC_PENDING)
1644				send_to_lecd(priv, l_svc_setup,
1645					     entry->mac_addr,
1646					     entry->atm_addr,
1647					     NULL);
1648		}
1649		if (entry->status == ESI_FLUSH_PENDING &&
1650		    time_after_eq(now, entry->timestamp +
1651				       priv->path_switching_delay)) {
1652			lec_arp_hold(entry);
1653			return true;
1654		}
1655	}
1656
1657	return false;
1658}
1659/*
1660 * Expire entries.
1661 * 1. Re-set timer
1662 * 2. For each entry, delete entries that have aged past the age limit.
1663 * 3. For each entry, depending on the status of the entry, perform
1664 *    the following maintenance.
1665 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1666 *       tick_count is above the max_unknown_frame_time, clear
1667 *       the tick_count to zero and clear the packets_flooded counter
1668 *       to zero. This supports the packet rate limit per address
1669 *       while flooding unknowns.
1670 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1671 *       than or equal to the path_switching_delay, change the status
1672 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1673 *       regardless of the progress of the flush protocol.
1674 */
1675static void lec_arp_check_expire(struct work_struct *work)
1676{
1677	unsigned long flags;
1678	struct lec_priv *priv =
1679		container_of(work, struct lec_priv, lec_arp_work.work);
1680	struct hlist_node *next;
1681	struct lec_arp_table *entry;
1682	unsigned long now;
1683	int i;
1684
1685	pr_debug("%p\n", priv);
1686	now = jiffies;
1687restart:
1688	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1689	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1690		hlist_for_each_entry_safe(entry, next,
1691					  &priv->lec_arp_tables[i], next) {
1692			if (__lec_arp_check_expire(entry, now, priv)) {
1693				struct sk_buff *skb;
1694				struct atm_vcc *vcc = entry->vcc;
1695
1696				spin_unlock_irqrestore(&priv->lec_arp_lock,
1697						       flags);
1698				while ((skb = skb_dequeue(&entry->tx_wait)))
1699					lec_send(vcc, skb);
1700				entry->last_used = jiffies;
1701				entry->status = ESI_FORWARD_DIRECT;
1702				lec_arp_put(entry);
1703
1704				goto restart;
1705			}
1706		}
1707	}
1708	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1709
1710	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1711}
1712
1713/*
1714 * Try to find vcc where mac_address is attached.
1715 *
1716 */
1717static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1718				       const unsigned char *mac_to_find,
1719				       int is_rdesc,
1720				       struct lec_arp_table **ret_entry)
1721{
1722	unsigned long flags;
1723	struct lec_arp_table *entry;
1724	struct atm_vcc *found;
1725
1726	if (mac_to_find[0] & 0x01) {
1727		switch (priv->lane_version) {
1728		case 1:
1729			return priv->mcast_vcc;
1730		case 2:	/* LANE2 wants arp for multicast addresses */
1731			if (ether_addr_equal(mac_to_find, bus_mac))
1732				return priv->mcast_vcc;
1733			break;
1734		default:
1735			break;
1736		}
1737	}
1738
1739	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1740	entry = lec_arp_find(priv, mac_to_find);
1741
1742	if (entry) {
1743		if (entry->status == ESI_FORWARD_DIRECT) {
1744			/* Connection Ok */
1745			entry->last_used = jiffies;
1746			lec_arp_hold(entry);
1747			*ret_entry = entry;
1748			found = entry->vcc;
1749			goto out;
1750		}
1751		/*
1752		 * If the LE_ARP cache entry is still pending, reset count to 0
1753		 * so another LE_ARP request can be made for this frame.
1754		 */
1755		if (entry->status == ESI_ARP_PENDING)
1756			entry->no_tries = 0;
1757		/*
1758		 * Data direct VC not yet set up, check to see if the unknown
1759		 * frame count is greater than the limit. If the limit has
1760		 * not been reached, allow the caller to send packet to
1761		 * BUS.
1762		 */
1763		if (entry->status != ESI_FLUSH_PENDING &&
1764		    entry->packets_flooded <
1765		    priv->maximum_unknown_frame_count) {
1766			entry->packets_flooded++;
1767			pr_debug("Flooding..\n");
1768			found = priv->mcast_vcc;
1769			goto out;
1770		}
1771		/*
1772		 * We got here because entry->status == ESI_FLUSH_PENDING
1773		 * or BUS flood limit was reached for an entry which is
1774		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1775		 */
1776		lec_arp_hold(entry);
1777		*ret_entry = entry;
1778		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1779			 entry->vcc);
1780		found = NULL;
1781	} else {
1782		/* No matching entry was found */
1783		entry = make_entry(priv, mac_to_find);
1784		pr_debug("Making entry\n");
1785		if (!entry) {
1786			found = priv->mcast_vcc;
1787			goto out;
1788		}
1789		lec_arp_add(priv, entry);
1790		/* We want arp-request(s) to be sent */
1791		entry->packets_flooded = 1;
1792		entry->status = ESI_ARP_PENDING;
1793		entry->no_tries = 1;
1794		entry->last_used = entry->timestamp = jiffies;
1795		entry->is_rdesc = is_rdesc;
1796		if (entry->is_rdesc)
1797			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1798				     NULL);
1799		else
1800			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1801		entry->timer.expires = jiffies + (1 * HZ);
1802		entry->timer.function = lec_arp_expire_arp;
1803		add_timer(&entry->timer);
1804		found = priv->mcast_vcc;
1805	}
1806
1807out:
1808	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1809	return found;
1810}
1811
1812static int
1813lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1814		unsigned long permanent)
1815{
1816	unsigned long flags;
1817	struct hlist_node *next;
1818	struct lec_arp_table *entry;
1819	int i;
1820
1821	pr_debug("\n");
1822	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1823	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1824		hlist_for_each_entry_safe(entry, next,
1825					  &priv->lec_arp_tables[i], next) {
1826			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1827			    (permanent ||
1828			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1829				lec_arp_remove(priv, entry);
1830				lec_arp_put(entry);
1831			}
1832			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1833			return 0;
1834		}
1835	}
1836	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1837	return -1;
1838}
1839
1840/*
1841 * Notifies:  Response to arp_request (atm_addr != NULL)
1842 */
1843static void
1844lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1845	       const unsigned char *atm_addr, unsigned long remoteflag,
1846	       unsigned int targetless_le_arp)
1847{
1848	unsigned long flags;
1849	struct hlist_node *next;
1850	struct lec_arp_table *entry, *tmp;
1851	int i;
1852
1853	pr_debug("%smac:%pM\n",
1854		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1855
1856	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1857	entry = lec_arp_find(priv, mac_addr);
1858	if (entry == NULL && targetless_le_arp)
1859		goto out;	/*
1860				 * LANE2: ignore targetless LE_ARPs for which
1861				 * we have no entry in the cache. 7.1.30
1862				 */
1863	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1864		hlist_for_each_entry_safe(entry, next,
1865					  &priv->lec_arp_empty_ones, next) {
1866			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1867				hlist_del(&entry->next);
1868				del_timer(&entry->timer);
1869				tmp = lec_arp_find(priv, mac_addr);
1870				if (tmp) {
1871					del_timer(&tmp->timer);
1872					tmp->status = ESI_FORWARD_DIRECT;
1873					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1874					tmp->vcc = entry->vcc;
1875					tmp->old_push = entry->old_push;
1876					tmp->last_used = jiffies;
1877					del_timer(&entry->timer);
1878					lec_arp_put(entry);
1879					entry = tmp;
1880				} else {
1881					entry->status = ESI_FORWARD_DIRECT;
1882					ether_addr_copy(entry->mac_addr,
1883							mac_addr);
1884					entry->last_used = jiffies;
1885					lec_arp_add(priv, entry);
1886				}
1887				if (remoteflag)
1888					entry->flags |= LEC_REMOTE_FLAG;
1889				else
1890					entry->flags &= ~LEC_REMOTE_FLAG;
1891				pr_debug("After update\n");
1892				dump_arp_table(priv);
1893				goto out;
1894			}
1895		}
1896	}
1897
1898	entry = lec_arp_find(priv, mac_addr);
1899	if (!entry) {
1900		entry = make_entry(priv, mac_addr);
1901		if (!entry)
1902			goto out;
1903		entry->status = ESI_UNKNOWN;
1904		lec_arp_add(priv, entry);
1905		/* Temporary, changes before end of function */
1906	}
1907	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1908	del_timer(&entry->timer);
1909	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1910		hlist_for_each_entry(tmp,
1911				     &priv->lec_arp_tables[i], next) {
1912			if (entry != tmp &&
1913			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1914				/* Vcc to this host exists */
1915				if (tmp->status > ESI_VC_PENDING) {
1916					/*
1917					 * ESI_FLUSH_PENDING,
1918					 * ESI_FORWARD_DIRECT
1919					 */
1920					entry->vcc = tmp->vcc;
1921					entry->old_push = tmp->old_push;
1922				}
1923				entry->status = tmp->status;
1924				break;
1925			}
1926		}
1927	}
1928	if (remoteflag)
1929		entry->flags |= LEC_REMOTE_FLAG;
1930	else
1931		entry->flags &= ~LEC_REMOTE_FLAG;
1932	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1933		entry->status = ESI_VC_PENDING;
1934		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1935	}
1936	pr_debug("After update2\n");
1937	dump_arp_table(priv);
1938out:
1939	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1940}
1941
1942/*
1943 * Notifies: Vcc setup ready
1944 */
1945static void
1946lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1947	      struct atm_vcc *vcc,
1948	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1949{
1950	unsigned long flags;
1951	struct lec_arp_table *entry;
1952	int i, found_entry = 0;
1953
1954	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1955	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1956	if (ioc_data->receive == 2) {
1957		pr_debug("LEC_ARP: Attaching mcast forward\n");
1958#if 0
1959		entry = lec_arp_find(priv, bus_mac);
1960		if (!entry) {
1961			pr_info("LEC_ARP: Multicast entry not found!\n");
1962			goto out;
1963		}
1964		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1965		entry->recv_vcc = vcc;
1966		entry->old_recv_push = old_push;
1967#endif
1968		entry = make_entry(priv, bus_mac);
1969		if (entry == NULL)
1970			goto out;
1971		del_timer(&entry->timer);
1972		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1973		entry->recv_vcc = vcc;
1974		entry->old_recv_push = old_push;
1975		hlist_add_head(&entry->next, &priv->mcast_fwds);
1976		goto out;
1977	} else if (ioc_data->receive == 1) {
1978		/*
1979		 * Vcc which we don't want to make default vcc,
1980		 * attach it anyway.
1981		 */
1982		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",
1983			 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1984			 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1985			 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1986			 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1987			 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1988			 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1989			 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1990			 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1991			 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1992			 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1993		entry = make_entry(priv, bus_mac);
1994		if (entry == NULL)
1995			goto out;
1996		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1997		eth_zero_addr(entry->mac_addr);
1998		entry->recv_vcc = vcc;
1999		entry->old_recv_push = old_push;
2000		entry->status = ESI_UNKNOWN;
2001		entry->timer.expires = jiffies + priv->vcc_timeout_period;
2002		entry->timer.function = lec_arp_expire_vcc;
2003		hlist_add_head(&entry->next, &priv->lec_no_forward);
2004		add_timer(&entry->timer);
2005		dump_arp_table(priv);
2006		goto out;
2007	}
2008	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",
2009		 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2010		 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2011		 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2012		 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2013		 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2014		 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2015		 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2016		 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2017		 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2018		 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2019	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2020		hlist_for_each_entry(entry,
2021				     &priv->lec_arp_tables[i], next) {
2022			if (memcmp
2023			    (ioc_data->atm_addr, entry->atm_addr,
2024			     ATM_ESA_LEN) == 0) {
2025				pr_debug("LEC_ARP: Attaching data direct\n");
2026				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2027					 entry->vcc ? entry->vcc->vci : 0,
2028					 entry->recv_vcc ? entry->recv_vcc->
2029					 vci : 0);
2030				found_entry = 1;
2031				del_timer(&entry->timer);
2032				entry->vcc = vcc;
2033				entry->old_push = old_push;
2034				if (entry->status == ESI_VC_PENDING) {
2035					if (priv->maximum_unknown_frame_count
2036					    == 0)
2037						entry->status =
2038						    ESI_FORWARD_DIRECT;
2039					else {
2040						entry->timestamp = jiffies;
2041						entry->status =
2042						    ESI_FLUSH_PENDING;
2043#if 0
2044						send_to_lecd(priv, l_flush_xmt,
2045							     NULL,
2046							     entry->atm_addr,
2047							     NULL);
2048#endif
2049					}
2050				} else {
2051					/*
2052					 * They were forming a connection
2053					 * to us, and we to them. Our
2054					 * ATM address is numerically lower
2055					 * than theirs, so we make connection
2056					 * we formed into default VCC (8.1.11).
2057					 * Connection they made gets torn
2058					 * down. This might confuse some
2059					 * clients. Can be changed if
2060					 * someone reports trouble...
2061					 */
2062					;
2063				}
2064			}
2065		}
2066	}
2067	if (found_entry) {
2068		pr_debug("After vcc was added\n");
2069		dump_arp_table(priv);
2070		goto out;
2071	}
2072	/*
2073	 * Not found, snatch address from first data packet that arrives
2074	 * from this vcc
2075	 */
2076	entry = make_entry(priv, bus_mac);
2077	if (!entry)
2078		goto out;
2079	entry->vcc = vcc;
2080	entry->old_push = old_push;
2081	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2082	eth_zero_addr(entry->mac_addr);
2083	entry->status = ESI_UNKNOWN;
2084	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2085	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2086	entry->timer.function = lec_arp_expire_vcc;
2087	add_timer(&entry->timer);
2088	pr_debug("After vcc was added\n");
2089	dump_arp_table(priv);
2090out:
2091	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2092}
2093
2094static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2095{
2096	unsigned long flags;
2097	struct lec_arp_table *entry;
2098	int i;
2099
2100	pr_debug("%lx\n", tran_id);
2101restart:
2102	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2103	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2104		hlist_for_each_entry(entry,
2105				     &priv->lec_arp_tables[i], next) {
2106			if (entry->flush_tran_id == tran_id &&
2107			    entry->status == ESI_FLUSH_PENDING) {
2108				struct sk_buff *skb;
2109				struct atm_vcc *vcc = entry->vcc;
2110
2111				lec_arp_hold(entry);
2112				spin_unlock_irqrestore(&priv->lec_arp_lock,
2113						       flags);
2114				while ((skb = skb_dequeue(&entry->tx_wait)))
2115					lec_send(vcc, skb);
2116				entry->last_used = jiffies;
2117				entry->status = ESI_FORWARD_DIRECT;
2118				lec_arp_put(entry);
2119				pr_debug("LEC_ARP: Flushed\n");
2120				goto restart;
2121			}
2122		}
2123	}
2124	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2125	dump_arp_table(priv);
2126}
2127
2128static void
2129lec_set_flush_tran_id(struct lec_priv *priv,
2130		      const unsigned char *atm_addr, unsigned long tran_id)
2131{
2132	unsigned long flags;
2133	struct lec_arp_table *entry;
2134	int i;
2135
2136	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2137	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2138		hlist_for_each_entry(entry,
2139				     &priv->lec_arp_tables[i], next) {
2140			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2141				entry->flush_tran_id = tran_id;
2142				pr_debug("Set flush transaction id to %lx for %p\n",
2143					 tran_id, entry);
2144			}
2145		}
2146	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2147}
2148
2149static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2150{
2151	unsigned long flags;
2152	unsigned char mac_addr[] = {
2153		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2154	};
2155	struct lec_arp_table *to_add;
2156	struct lec_vcc_priv *vpriv;
2157	int err = 0;
2158
2159	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2160	if (!vpriv)
2161		return -ENOMEM;
2162	vpriv->xoff = 0;
2163	vpriv->old_pop = vcc->pop;
2164	vcc->user_back = vpriv;
2165	vcc->pop = lec_pop;
2166	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2167	to_add = make_entry(priv, mac_addr);
2168	if (!to_add) {
2169		vcc->pop = vpriv->old_pop;
2170		kfree(vpriv);
2171		err = -ENOMEM;
2172		goto out;
2173	}
2174	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2175	to_add->status = ESI_FORWARD_DIRECT;
2176	to_add->flags |= LEC_PERMANENT_FLAG;
2177	to_add->vcc = vcc;
2178	to_add->old_push = vcc->push;
2179	vcc->push = lec_push;
2180	priv->mcast_vcc = vcc;
2181	lec_arp_add(priv, to_add);
2182out:
2183	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2184	return err;
2185}
2186
2187static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2188{
2189	unsigned long flags;
2190	struct hlist_node *next;
2191	struct lec_arp_table *entry;
2192	int i;
2193
2194	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2195	dump_arp_table(priv);
2196
2197	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2198
2199	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2200		hlist_for_each_entry_safe(entry, next,
2201					  &priv->lec_arp_tables[i], next) {
2202			if (vcc == entry->vcc) {
2203				lec_arp_remove(priv, entry);
2204				lec_arp_put(entry);
2205				if (priv->mcast_vcc == vcc)
2206					priv->mcast_vcc = NULL;
2207			}
2208		}
2209	}
2210
2211	hlist_for_each_entry_safe(entry, next,
2212				  &priv->lec_arp_empty_ones, next) {
2213		if (entry->vcc == vcc) {
2214			lec_arp_clear_vccs(entry);
2215			del_timer(&entry->timer);
2216			hlist_del(&entry->next);
2217			lec_arp_put(entry);
2218		}
2219	}
2220
2221	hlist_for_each_entry_safe(entry, next,
2222				  &priv->lec_no_forward, next) {
2223		if (entry->recv_vcc == vcc) {
2224			lec_arp_clear_vccs(entry);
2225			del_timer(&entry->timer);
2226			hlist_del(&entry->next);
2227			lec_arp_put(entry);
2228		}
2229	}
2230
2231	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2232		if (entry->recv_vcc == vcc) {
2233			lec_arp_clear_vccs(entry);
2234			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2235			hlist_del(&entry->next);
2236			lec_arp_put(entry);
2237		}
2238	}
2239
2240	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2241	dump_arp_table(priv);
2242}
2243
2244static void
2245lec_arp_check_empties(struct lec_priv *priv,
2246		      struct atm_vcc *vcc, struct sk_buff *skb)
2247{
2248	unsigned long flags;
2249	struct hlist_node *next;
2250	struct lec_arp_table *entry, *tmp;
2251	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2252	unsigned char *src = hdr->h_source;
2253
2254	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2255	hlist_for_each_entry_safe(entry, next,
2256				  &priv->lec_arp_empty_ones, next) {
2257		if (vcc == entry->vcc) {
2258			del_timer(&entry->timer);
2259			ether_addr_copy(entry->mac_addr, src);
2260			entry->status = ESI_FORWARD_DIRECT;
2261			entry->last_used = jiffies;
2262			/* We might have got an entry */
2263			tmp = lec_arp_find(priv, src);
2264			if (tmp) {
2265				lec_arp_remove(priv, tmp);
2266				lec_arp_put(tmp);
2267			}
2268			hlist_del(&entry->next);
2269			lec_arp_add(priv, entry);
2270			goto out;
2271		}
2272	}
2273	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2274out:
2275	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2276}
2277
2278MODULE_LICENSE("GPL");