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, skb2->len);
 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		kfree_skb(skb);
 235		if (skb2 == NULL)
 236			return NETDEV_TX_OK;
 
 
 237		skb = skb2;
 238	}
 239	skb_push(skb, 2);
 240
 241	/* Put le header to place */
 242	lec_h = (struct lecdatahdr_8023 *)skb->data;
 243	lec_h->le_header = htons(priv->lecid);
 244
 245#if DUMP_PACKETS >= 2
 246#define MAX_DUMP_SKB 99
 247#elif DUMP_PACKETS >= 1
 248#define MAX_DUMP_SKB 30
 249#endif
 250#if DUMP_PACKETS >= 1
 251	printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 252	       dev->name, skb->len, priv->lecid);
 253	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 254		       skb->data, min(skb->len, MAX_DUMP_SKB), true);
 255#endif /* DUMP_PACKETS >= 1 */
 256
 257	/* Minimum ethernet-frame size */
 258	min_frame_size = LEC_MINIMUM_8023_SIZE;
 259	if (skb->len < min_frame_size) {
 260		if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 261			skb2 = skb_copy_expand(skb, 0,
 262					       min_frame_size - skb->truesize,
 263					       GFP_ATOMIC);
 264			dev_kfree_skb(skb);
 265			if (skb2 == NULL) {
 266				dev->stats.tx_dropped++;
 267				return NETDEV_TX_OK;
 268			}
 269			skb = skb2;
 270		}
 271		skb_put(skb, min_frame_size - skb->len);
 272	}
 273
 274	/* Send to right vcc */
 275	is_rdesc = 0;
 276	dst = lec_h->h_dest;
 277	entry = NULL;
 278	vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 279	pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 280		 dev->name, vcc, vcc ? vcc->flags : 0, entry);
 281	if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 282		if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 283			pr_debug("%s:queuing packet, MAC address %pM\n",
 284				 dev->name, lec_h->h_dest);
 285			skb_queue_tail(&entry->tx_wait, skb);
 286		} else {
 287			pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 288				 dev->name, lec_h->h_dest);
 289			dev->stats.tx_dropped++;
 290			dev_kfree_skb(skb);
 291		}
 292		goto out;
 293	}
 294#if DUMP_PACKETS > 0
 295	printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 296	       dev->name, vcc->vpi, vcc->vci);
 297#endif /* DUMP_PACKETS > 0 */
 298
 299	while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 300		pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 301		lec_send(vcc, skb2);
 302	}
 303
 304	lec_send(vcc, skb);
 305
 306	if (!atm_may_send(vcc, 0)) {
 307		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 308
 309		vpriv->xoff = 1;
 310		netif_stop_queue(dev);
 311
 312		/*
 313		 * vcc->pop() might have occurred in between, making
 314		 * the vcc usuable again.  Since xmit is serialized,
 315		 * this is the only situation we have to re-test.
 316		 */
 317
 318		if (atm_may_send(vcc, 0))
 319			netif_wake_queue(dev);
 320	}
 321
 322out:
 323	if (entry)
 324		lec_arp_put(entry);
 325	dev->trans_start = jiffies;
 326	return NETDEV_TX_OK;
 327}
 328
 329/* The inverse routine to net_open(). */
 330static int lec_close(struct net_device *dev)
 331{
 332	netif_stop_queue(dev);
 333	return 0;
 334}
 335
 336static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 337{
 338	unsigned long flags;
 339	struct net_device *dev = (struct net_device *)vcc->proto_data;
 340	struct lec_priv *priv = netdev_priv(dev);
 341	struct atmlec_msg *mesg;
 342	struct lec_arp_table *entry;
 343	int i;
 344	char *tmp;		/* FIXME */
 345
 346	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 347	mesg = (struct atmlec_msg *)skb->data;
 348	tmp = skb->data;
 349	tmp += sizeof(struct atmlec_msg);
 350	pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 351	switch (mesg->type) {
 352	case l_set_mac_addr:
 353		for (i = 0; i < 6; i++)
 354			dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 355		break;
 356	case l_del_mac_addr:
 357		for (i = 0; i < 6; i++)
 358			dev->dev_addr[i] = 0;
 359		break;
 360	case l_addr_delete:
 361		lec_addr_delete(priv, mesg->content.normal.atm_addr,
 362				mesg->content.normal.flag);
 363		break;
 364	case l_topology_change:
 365		priv->topology_change = mesg->content.normal.flag;
 366		break;
 367	case l_flush_complete:
 368		lec_flush_complete(priv, mesg->content.normal.flag);
 369		break;
 370	case l_narp_req:	/* LANE2: see 7.1.35 in the lane2 spec */
 371		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 372		entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 373		lec_arp_remove(priv, entry);
 374		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 375
 376		if (mesg->content.normal.no_source_le_narp)
 377			break;
 378		/* FALL THROUGH */
 379	case l_arp_update:
 380		lec_arp_update(priv, mesg->content.normal.mac_addr,
 381			       mesg->content.normal.atm_addr,
 382			       mesg->content.normal.flag,
 383			       mesg->content.normal.targetless_le_arp);
 384		pr_debug("in l_arp_update\n");
 385		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
 386			pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 387				 mesg->sizeoftlvs);
 388			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 389					    tmp, mesg->sizeoftlvs);
 390		}
 391		break;
 392	case l_config:
 393		priv->maximum_unknown_frame_count =
 394		    mesg->content.config.maximum_unknown_frame_count;
 395		priv->max_unknown_frame_time =
 396		    (mesg->content.config.max_unknown_frame_time * HZ);
 397		priv->max_retry_count = mesg->content.config.max_retry_count;
 398		priv->aging_time = (mesg->content.config.aging_time * HZ);
 399		priv->forward_delay_time =
 400		    (mesg->content.config.forward_delay_time * HZ);
 401		priv->arp_response_time =
 402		    (mesg->content.config.arp_response_time * HZ);
 403		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 404		priv->path_switching_delay =
 405		    (mesg->content.config.path_switching_delay * HZ);
 406		priv->lane_version = mesg->content.config.lane_version;
 407					/* LANE2 */
 408		priv->lane2_ops = NULL;
 409		if (priv->lane_version > 1)
 410			priv->lane2_ops = &lane2_ops;
 411		if (dev_set_mtu(dev, mesg->content.config.mtu))
 412			pr_info("%s: change_mtu to %d failed\n",
 413				dev->name, mesg->content.config.mtu);
 414		priv->is_proxy = mesg->content.config.is_proxy;
 415		break;
 416	case l_flush_tran_id:
 417		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 418				      mesg->content.normal.flag);
 419		break;
 420	case l_set_lecid:
 421		priv->lecid =
 422		    (unsigned short)(0xffff & mesg->content.normal.flag);
 423		break;
 424	case l_should_bridge:
 425#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 426	{
 427		pr_debug("%s: bridge zeppelin asks about %pM\n",
 428			 dev->name, mesg->content.proxy.mac_addr);
 429
 430		if (br_fdb_test_addr_hook == NULL)
 431			break;
 432
 433		if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 434			/* hit from bridge table, send LE_ARP_RESPONSE */
 435			struct sk_buff *skb2;
 436			struct sock *sk;
 437
 438			pr_debug("%s: entry found, responding to zeppelin\n",
 439				 dev->name);
 440			skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 441			if (skb2 == NULL)
 442				break;
 443			skb2->len = sizeof(struct atmlec_msg);
 444			skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 445			atm_force_charge(priv->lecd, skb2->truesize);
 446			sk = sk_atm(priv->lecd);
 447			skb_queue_tail(&sk->sk_receive_queue, skb2);
 448			sk->sk_data_ready(sk, skb2->len);
 449		}
 450	}
 451#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 452		break;
 453	default:
 454		pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 455		dev_kfree_skb(skb);
 456		return -EINVAL;
 457	}
 458	dev_kfree_skb(skb);
 459	return 0;
 460}
 461
 462static void lec_atm_close(struct atm_vcc *vcc)
 463{
 464	struct sk_buff *skb;
 465	struct net_device *dev = (struct net_device *)vcc->proto_data;
 466	struct lec_priv *priv = netdev_priv(dev);
 467
 468	priv->lecd = NULL;
 469	/* Do something needful? */
 470
 471	netif_stop_queue(dev);
 472	lec_arp_destroy(priv);
 473
 474	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 475		pr_info("%s closing with messages pending\n", dev->name);
 476	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 477		atm_return(vcc, skb->truesize);
 478		dev_kfree_skb(skb);
 479	}
 480
 481	pr_info("%s: Shut down!\n", dev->name);
 482	module_put(THIS_MODULE);
 483}
 484
 485static struct atmdev_ops lecdev_ops = {
 486	.close = lec_atm_close,
 487	.send = lec_atm_send
 488};
 489
 490static struct atm_dev lecatm_dev = {
 491	.ops = &lecdev_ops,
 492	.type = "lec",
 493	.number = 999,		/* dummy device number */
 494	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 495};
 496
 497/*
 498 * LANE2: new argument struct sk_buff *data contains
 499 * the LE_ARP based TLVs introduced in the LANE2 spec
 500 */
 501static int
 502send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 503	     const unsigned char *mac_addr, const unsigned char *atm_addr,
 504	     struct sk_buff *data)
 505{
 506	struct sock *sk;
 507	struct sk_buff *skb;
 508	struct atmlec_msg *mesg;
 509
 510	if (!priv || !priv->lecd)
 511		return -1;
 512	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 513	if (!skb)
 514		return -1;
 515	skb->len = sizeof(struct atmlec_msg);
 516	mesg = (struct atmlec_msg *)skb->data;
 517	memset(mesg, 0, sizeof(struct atmlec_msg));
 518	mesg->type = type;
 519	if (data != NULL)
 520		mesg->sizeoftlvs = data->len;
 521	if (mac_addr)
 522		memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 523	else
 524		mesg->content.normal.targetless_le_arp = 1;
 525	if (atm_addr)
 526		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 527
 528	atm_force_charge(priv->lecd, skb->truesize);
 529	sk = sk_atm(priv->lecd);
 530	skb_queue_tail(&sk->sk_receive_queue, skb);
 531	sk->sk_data_ready(sk, skb->len);
 532
 533	if (data != NULL) {
 534		pr_debug("about to send %d bytes of data\n", data->len);
 535		atm_force_charge(priv->lecd, data->truesize);
 536		skb_queue_tail(&sk->sk_receive_queue, data);
 537		sk->sk_data_ready(sk, skb->len);
 538	}
 539
 540	return 0;
 541}
 542
 543/* shamelessly stolen from drivers/net/net_init.c */
 544static int lec_change_mtu(struct net_device *dev, int new_mtu)
 545{
 546	if ((new_mtu < 68) || (new_mtu > 18190))
 547		return -EINVAL;
 548	dev->mtu = new_mtu;
 549	return 0;
 550}
 551
 552static void lec_set_multicast_list(struct net_device *dev)
 553{
 554	/*
 555	 * by default, all multicast frames arrive over the bus.
 556	 * eventually support selective multicast service
 557	 */
 558}
 559
 560static const struct net_device_ops lec_netdev_ops = {
 561	.ndo_open		= lec_open,
 562	.ndo_stop		= lec_close,
 563	.ndo_start_xmit		= lec_start_xmit,
 564	.ndo_change_mtu		= lec_change_mtu,
 565	.ndo_tx_timeout		= lec_tx_timeout,
 566	.ndo_set_rx_mode	= lec_set_multicast_list,
 567};
 568
 569static const unsigned char lec_ctrl_magic[] = {
 570	0xff,
 571	0x00,
 572	0x01,
 573	0x01
 574};
 575
 576#define LEC_DATA_DIRECT_8023  2
 577#define LEC_DATA_DIRECT_8025  3
 578
 579static int lec_is_data_direct(struct atm_vcc *vcc)
 580{
 581	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 582		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 583}
 584
 585static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 586{
 587	unsigned long flags;
 588	struct net_device *dev = (struct net_device *)vcc->proto_data;
 589	struct lec_priv *priv = netdev_priv(dev);
 590
 591#if DUMP_PACKETS > 0
 592	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 593	       dev->name, vcc->vpi, vcc->vci);
 594#endif
 595	if (!skb) {
 596		pr_debug("%s: null skb\n", dev->name);
 597		lec_vcc_close(priv, vcc);
 598		return;
 599	}
 600#if DUMP_PACKETS >= 2
 601#define MAX_SKB_DUMP 99
 602#elif DUMP_PACKETS >= 1
 603#define MAX_SKB_DUMP 30
 604#endif
 605#if DUMP_PACKETS > 0
 606	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 607	       dev->name, skb->len, priv->lecid);
 608	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 609		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 610#endif /* DUMP_PACKETS > 0 */
 611	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 612				/* Control frame, to daemon */
 613		struct sock *sk = sk_atm(vcc);
 614
 615		pr_debug("%s: To daemon\n", dev->name);
 616		skb_queue_tail(&sk->sk_receive_queue, skb);
 617		sk->sk_data_ready(sk, skb->len);
 618	} else {		/* Data frame, queue to protocol handlers */
 619		struct lec_arp_table *entry;
 620		unsigned char *src, *dst;
 621
 622		atm_return(vcc, skb->truesize);
 623		if (*(__be16 *) skb->data == htons(priv->lecid) ||
 624		    !priv->lecd || !(dev->flags & IFF_UP)) {
 625			/*
 626			 * Probably looping back, or if lecd is missing,
 627			 * lecd has gone down
 628			 */
 629			pr_debug("Ignoring frame...\n");
 630			dev_kfree_skb(skb);
 631			return;
 632		}
 633		dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 634
 635		/*
 636		 * If this is a Data Direct VCC, and the VCC does not match
 637		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 638		 */
 639		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 640		if (lec_is_data_direct(vcc)) {
 641			src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 642			entry = lec_arp_find(priv, src);
 643			if (entry && entry->vcc != vcc) {
 644				lec_arp_remove(priv, entry);
 645				lec_arp_put(entry);
 646			}
 647		}
 648		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 649
 650		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
 651		    !priv->is_proxy &&	/* Proxy wants all the packets */
 652		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 653			dev_kfree_skb(skb);
 654			return;
 655		}
 656		if (!hlist_empty(&priv->lec_arp_empty_ones))
 657			lec_arp_check_empties(priv, vcc, skb);
 658		skb_pull(skb, 2);	/* skip lec_id */
 659		skb->protocol = eth_type_trans(skb, dev);
 660		dev->stats.rx_packets++;
 661		dev->stats.rx_bytes += skb->len;
 662		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 663		netif_rx(skb);
 664	}
 665}
 666
 667static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 668{
 669	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 670	struct net_device *dev = skb->dev;
 671
 672	if (vpriv == NULL) {
 673		pr_info("vpriv = NULL!?!?!?\n");
 674		return;
 675	}
 676
 677	vpriv->old_pop(vcc, skb);
 678
 679	if (vpriv->xoff && atm_may_send(vcc, 0)) {
 680		vpriv->xoff = 0;
 681		if (netif_running(dev) && netif_queue_stopped(dev))
 682			netif_wake_queue(dev);
 683	}
 684}
 685
 686static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 687{
 688	struct lec_vcc_priv *vpriv;
 689	int bytes_left;
 690	struct atmlec_ioc ioc_data;
 691
 692	/* Lecd must be up in this case */
 693	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 694	if (bytes_left != 0)
 695		pr_info("copy from user failed for %d bytes\n", bytes_left);
 696	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 697	    !dev_lec[ioc_data.dev_num])
 698		return -EINVAL;
 699	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 700	if (!vpriv)
 701		return -ENOMEM;
 702	vpriv->xoff = 0;
 703	vpriv->old_pop = vcc->pop;
 704	vcc->user_back = vpriv;
 705	vcc->pop = lec_pop;
 706	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 707		      &ioc_data, vcc, vcc->push);
 708	vcc->proto_data = dev_lec[ioc_data.dev_num];
 709	vcc->push = lec_push;
 710	return 0;
 711}
 712
 713static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 714{
 715	if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 716		return -EINVAL;
 717	vcc->proto_data = dev_lec[arg];
 718	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 719}
 720
 721/* Initialize device. */
 722static int lecd_attach(struct atm_vcc *vcc, int arg)
 723{
 724	int i;
 725	struct lec_priv *priv;
 726
 727	if (arg < 0)
 728		i = 0;
 729	else
 730		i = arg;
 731	if (arg >= MAX_LEC_ITF)
 732		return -EINVAL;
 733	if (!dev_lec[i]) {
 734		int size;
 735
 736		size = sizeof(struct lec_priv);
 737		dev_lec[i] = alloc_etherdev(size);
 738		if (!dev_lec[i])
 739			return -ENOMEM;
 740		dev_lec[i]->netdev_ops = &lec_netdev_ops;
 741		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 742		if (register_netdev(dev_lec[i])) {
 743			free_netdev(dev_lec[i]);
 744			return -EINVAL;
 745		}
 746
 747		priv = netdev_priv(dev_lec[i]);
 748	} else {
 749		priv = netdev_priv(dev_lec[i]);
 750		if (priv->lecd)
 751			return -EADDRINUSE;
 752	}
 753	lec_arp_init(priv);
 754	priv->itfnum = i;	/* LANE2 addition */
 755	priv->lecd = vcc;
 756	vcc->dev = &lecatm_dev;
 757	vcc_insert_socket(sk_atm(vcc));
 758
 759	vcc->proto_data = dev_lec[i];
 760	set_bit(ATM_VF_META, &vcc->flags);
 761	set_bit(ATM_VF_READY, &vcc->flags);
 762
 763	/* Set default values to these variables */
 764	priv->maximum_unknown_frame_count = 1;
 765	priv->max_unknown_frame_time = (1 * HZ);
 766	priv->vcc_timeout_period = (1200 * HZ);
 767	priv->max_retry_count = 1;
 768	priv->aging_time = (300 * HZ);
 769	priv->forward_delay_time = (15 * HZ);
 770	priv->topology_change = 0;
 771	priv->arp_response_time = (1 * HZ);
 772	priv->flush_timeout = (4 * HZ);
 773	priv->path_switching_delay = (6 * HZ);
 774
 775	if (dev_lec[i]->flags & IFF_UP)
 776		netif_start_queue(dev_lec[i]);
 777	__module_get(THIS_MODULE);
 778	return i;
 779}
 780
 781#ifdef CONFIG_PROC_FS
 782static const char *lec_arp_get_status_string(unsigned char status)
 783{
 784	static const char *const lec_arp_status_string[] = {
 785		"ESI_UNKNOWN       ",
 786		"ESI_ARP_PENDING   ",
 787		"ESI_VC_PENDING    ",
 788		"<Undefined>       ",
 789		"ESI_FLUSH_PENDING ",
 790		"ESI_FORWARD_DIRECT"
 791	};
 792
 793	if (status > ESI_FORWARD_DIRECT)
 794		status = 3;	/* ESI_UNDEFINED */
 795	return lec_arp_status_string[status];
 796}
 797
 798static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 799{
 800	int i;
 801
 802	for (i = 0; i < ETH_ALEN; i++)
 803		seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 804	seq_printf(seq, " ");
 805	for (i = 0; i < ATM_ESA_LEN; i++)
 806		seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 807	seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 808		   entry->flags & 0xffff);
 809	if (entry->vcc)
 810		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 811	else
 812		seq_printf(seq, "        ");
 813	if (entry->recv_vcc) {
 814		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 815			   entry->recv_vcc->vci);
 816	}
 817	seq_putc(seq, '\n');
 818}
 819
 820struct lec_state {
 821	unsigned long flags;
 822	struct lec_priv *locked;
 823	struct hlist_node *node;
 824	struct net_device *dev;
 825	int itf;
 826	int arp_table;
 827	int misc_table;
 828};
 829
 830static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 831			  loff_t *l)
 832{
 833	struct hlist_node *e = state->node;
 834	struct lec_arp_table *tmp;
 835
 836	if (!e)
 837		e = tbl->first;
 838	if (e == SEQ_START_TOKEN) {
 839		e = tbl->first;
 840		--*l;
 841	}
 842
 843	hlist_for_each_entry_from(tmp, e, next) {
 
 
 844		if (--*l < 0)
 845			break;
 846	}
 847	state->node = e;
 848
 849	return (*l < 0) ? state : NULL;
 850}
 851
 852static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 853			  struct lec_priv *priv)
 854{
 855	void *v = NULL;
 856	int p;
 857
 858	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 859		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 860		if (v)
 861			break;
 862	}
 863	state->arp_table = p;
 864	return v;
 865}
 866
 867static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 868			   struct lec_priv *priv)
 869{
 870	struct hlist_head *lec_misc_tables[] = {
 871		&priv->lec_arp_empty_ones,
 872		&priv->lec_no_forward,
 873		&priv->mcast_fwds
 874	};
 875	void *v = NULL;
 876	int q;
 877
 878	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 879		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 880		if (v)
 881			break;
 882	}
 883	state->misc_table = q;
 884	return v;
 885}
 886
 887static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 888			   struct lec_priv *priv)
 889{
 890	if (!state->locked) {
 891		state->locked = priv;
 892		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 893	}
 894	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 895		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 896		state->locked = NULL;
 897		/* Partial state reset for the next time we get called */
 898		state->arp_table = state->misc_table = 0;
 899	}
 900	return state->locked;
 901}
 902
 903static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 904{
 905	struct net_device *dev;
 906	void *v;
 907
 908	dev = state->dev ? state->dev : dev_lec[state->itf];
 909	v = (dev && netdev_priv(dev)) ?
 910		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 911	if (!v && dev) {
 912		dev_put(dev);
 913		/* Partial state reset for the next time we get called */
 914		dev = NULL;
 915	}
 916	state->dev = dev;
 917	return v;
 918}
 919
 920static void *lec_get_idx(struct lec_state *state, loff_t l)
 921{
 922	void *v = NULL;
 923
 924	for (; state->itf < MAX_LEC_ITF; state->itf++) {
 925		v = lec_itf_walk(state, &l);
 926		if (v)
 927			break;
 928	}
 929	return v;
 930}
 931
 932static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 933{
 934	struct lec_state *state = seq->private;
 935
 936	state->itf = 0;
 937	state->dev = NULL;
 938	state->locked = NULL;
 939	state->arp_table = 0;
 940	state->misc_table = 0;
 941	state->node = SEQ_START_TOKEN;
 942
 943	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 944}
 945
 946static void lec_seq_stop(struct seq_file *seq, void *v)
 947{
 948	struct lec_state *state = seq->private;
 949
 950	if (state->dev) {
 951		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 952				       state->flags);
 953		dev_put(state->dev);
 954	}
 955}
 956
 957static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 958{
 959	struct lec_state *state = seq->private;
 960
 961	v = lec_get_idx(state, 1);
 962	*pos += !!PTR_ERR(v);
 963	return v;
 964}
 965
 966static int lec_seq_show(struct seq_file *seq, void *v)
 967{
 968	static const char lec_banner[] =
 969	    "Itf  MAC          ATM destination"
 970	    "                          Status            Flags "
 971	    "VPI/VCI Recv VPI/VCI\n";
 972
 973	if (v == SEQ_START_TOKEN)
 974		seq_puts(seq, lec_banner);
 975	else {
 976		struct lec_state *state = seq->private;
 977		struct net_device *dev = state->dev;
 978		struct lec_arp_table *entry = hlist_entry(state->node,
 979							  struct lec_arp_table,
 980							  next);
 981
 982		seq_printf(seq, "%s ", dev->name);
 983		lec_info(seq, entry);
 984	}
 985	return 0;
 986}
 987
 988static const struct seq_operations lec_seq_ops = {
 989	.start = lec_seq_start,
 990	.next = lec_seq_next,
 991	.stop = lec_seq_stop,
 992	.show = lec_seq_show,
 993};
 994
 995static int lec_seq_open(struct inode *inode, struct file *file)
 996{
 997	return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
 998}
 999
1000static const struct file_operations lec_seq_fops = {
1001	.owner = THIS_MODULE,
1002	.open = lec_seq_open,
1003	.read = seq_read,
1004	.llseek = seq_lseek,
1005	.release = seq_release_private,
1006};
1007#endif
1008
1009static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1010{
1011	struct atm_vcc *vcc = ATM_SD(sock);
1012	int err = 0;
1013
1014	switch (cmd) {
1015	case ATMLEC_CTRL:
1016	case ATMLEC_MCAST:
1017	case ATMLEC_DATA:
1018		if (!capable(CAP_NET_ADMIN))
1019			return -EPERM;
1020		break;
1021	default:
1022		return -ENOIOCTLCMD;
1023	}
1024
1025	switch (cmd) {
1026	case ATMLEC_CTRL:
1027		err = lecd_attach(vcc, (int)arg);
1028		if (err >= 0)
1029			sock->state = SS_CONNECTED;
1030		break;
1031	case ATMLEC_MCAST:
1032		err = lec_mcast_attach(vcc, (int)arg);
1033		break;
1034	case ATMLEC_DATA:
1035		err = lec_vcc_attach(vcc, (void __user *)arg);
1036		break;
1037	}
1038
1039	return err;
1040}
1041
1042static struct atm_ioctl lane_ioctl_ops = {
1043	.owner = THIS_MODULE,
1044	.ioctl = lane_ioctl,
1045};
1046
1047static int __init lane_module_init(void)
1048{
1049#ifdef CONFIG_PROC_FS
1050	struct proc_dir_entry *p;
1051
1052	p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1053	if (!p) {
1054		pr_err("Unable to initialize /proc/net/atm/lec\n");
1055		return -ENOMEM;
1056	}
1057#endif
1058
1059	register_atm_ioctl(&lane_ioctl_ops);
1060	pr_info("lec.c: initialized\n");
1061	return 0;
1062}
1063
1064static void __exit lane_module_cleanup(void)
1065{
1066	int i;
1067
1068	remove_proc_entry("lec", atm_proc_root);
1069
1070	deregister_atm_ioctl(&lane_ioctl_ops);
1071
1072	for (i = 0; i < MAX_LEC_ITF; i++) {
1073		if (dev_lec[i] != NULL) {
1074			unregister_netdev(dev_lec[i]);
1075			free_netdev(dev_lec[i]);
1076			dev_lec[i] = NULL;
1077		}
1078	}
1079}
1080
1081module_init(lane_module_init);
1082module_exit(lane_module_cleanup);
1083
1084/*
1085 * LANE2: 3.1.3, LE_RESOLVE.request
1086 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1087 * If sizeoftlvs == NULL the default TLVs associated with with this
1088 * lec will be used.
1089 * If dst_mac == NULL, targetless LE_ARP will be sent
1090 */
1091static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1092			 u8 **tlvs, u32 *sizeoftlvs)
1093{
1094	unsigned long flags;
1095	struct lec_priv *priv = netdev_priv(dev);
1096	struct lec_arp_table *table;
1097	struct sk_buff *skb;
1098	int retval;
1099
1100	if (force == 0) {
1101		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1102		table = lec_arp_find(priv, dst_mac);
1103		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1104		if (table == NULL)
1105			return -1;
1106
1107		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1108		if (*tlvs == NULL)
1109			return -1;
1110
1111		*sizeoftlvs = table->sizeoftlvs;
1112
1113		return 0;
1114	}
1115
1116	if (sizeoftlvs == NULL)
1117		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1118
1119	else {
1120		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1121		if (skb == NULL)
1122			return -1;
1123		skb->len = *sizeoftlvs;
1124		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1125		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1126	}
1127	return retval;
1128}
1129
1130/*
1131 * LANE2: 3.1.4, LE_ASSOCIATE.request
1132 * Associate the *tlvs with the *lan_dst address.
1133 * Will overwrite any previous association
1134 * Returns 1 for success, 0 for failure (out of memory)
1135 *
1136 */
1137static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1138			       const u8 *tlvs, u32 sizeoftlvs)
1139{
1140	int retval;
1141	struct sk_buff *skb;
1142	struct lec_priv *priv = netdev_priv(dev);
1143
1144	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1145		return 0;	/* not our mac address */
1146
1147	kfree(priv->tlvs);	/* NULL if there was no previous association */
1148
1149	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1150	if (priv->tlvs == NULL)
1151		return 0;
1152	priv->sizeoftlvs = sizeoftlvs;
1153
1154	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1155	if (skb == NULL)
1156		return 0;
1157	skb->len = sizeoftlvs;
1158	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1159	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1160	if (retval != 0)
1161		pr_info("lec.c: lane2_associate_req() failed\n");
1162	/*
1163	 * If the previous association has changed we must
1164	 * somehow notify other LANE entities about the change
1165	 */
1166	return 1;
1167}
1168
1169/*
1170 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1171 *
1172 */
1173static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1174				const u8 *tlvs, u32 sizeoftlvs)
1175{
1176#if 0
1177	int i = 0;
1178#endif
1179	struct lec_priv *priv = netdev_priv(dev);
1180#if 0				/*
1181				 * Why have the TLVs in LE_ARP entries
1182				 * since we do not use them? When you
1183				 * uncomment this code, make sure the
1184				 * TLVs get freed when entry is killed
1185				 */
1186	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1187
1188	if (entry == NULL)
1189		return;		/* should not happen */
1190
1191	kfree(entry->tlvs);
1192
1193	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1194	if (entry->tlvs == NULL)
1195		return;
1196	entry->sizeoftlvs = sizeoftlvs;
1197#endif
1198#if 0
1199	pr_info("\n");
1200	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1201	while (i < sizeoftlvs)
1202		pr_cont("%02x ", tlvs[i++]);
1203
1204	pr_cont("\n");
1205#endif
1206
1207	/* tell MPOA about the TLVs we saw */
1208	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1209		priv->lane2_ops->associate_indicator(dev, mac_addr,
1210						     tlvs, sizeoftlvs);
1211	}
1212}
1213
1214/*
1215 * Here starts what used to lec_arpc.c
1216 *
1217 * lec_arpc.c was added here when making
1218 * lane client modular. October 1997
1219 */
1220
1221#include <linux/types.h>
1222#include <linux/timer.h>
1223#include <linux/param.h>
1224#include <linux/atomic.h>
1225#include <linux/inetdevice.h>
1226#include <net/route.h>
1227
1228#if 0
1229#define pr_debug(format, args...)
1230/*
1231  #define pr_debug printk
1232*/
1233#endif
1234#define DEBUG_ARP_TABLE 0
1235
1236#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1237
1238static void lec_arp_check_expire(struct work_struct *work);
1239static void lec_arp_expire_arp(unsigned long data);
1240
1241/*
1242 * Arp table funcs
1243 */
1244
1245#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1246
1247/*
1248 * Initialization of arp-cache
1249 */
1250static void lec_arp_init(struct lec_priv *priv)
1251{
1252	unsigned short i;
1253
1254	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1255		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1256	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1257	INIT_HLIST_HEAD(&priv->lec_no_forward);
1258	INIT_HLIST_HEAD(&priv->mcast_fwds);
1259	spin_lock_init(&priv->lec_arp_lock);
1260	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1261	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1262}
1263
1264static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1265{
1266	if (entry->vcc) {
1267		struct atm_vcc *vcc = entry->vcc;
1268		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1269		struct net_device *dev = (struct net_device *)vcc->proto_data;
1270
1271		vcc->pop = vpriv->old_pop;
1272		if (vpriv->xoff)
1273			netif_wake_queue(dev);
1274		kfree(vpriv);
1275		vcc->user_back = NULL;
1276		vcc->push = entry->old_push;
1277		vcc_release_async(vcc, -EPIPE);
1278		entry->vcc = NULL;
1279	}
1280	if (entry->recv_vcc) {
1281		entry->recv_vcc->push = entry->old_recv_push;
1282		vcc_release_async(entry->recv_vcc, -EPIPE);
1283		entry->recv_vcc = NULL;
1284	}
1285}
1286
1287/*
1288 * Insert entry to lec_arp_table
1289 * LANE2: Add to the end of the list to satisfy 8.1.13
1290 */
1291static inline void
1292lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1293{
1294	struct hlist_head *tmp;
1295
1296	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1297	hlist_add_head(&entry->next, tmp);
1298
1299	pr_debug("Added entry:%pM\n", entry->mac_addr);
1300}
1301
1302/*
1303 * Remove entry from lec_arp_table
1304 */
1305static int
1306lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1307{
1308	struct hlist_node *node;
1309	struct lec_arp_table *entry;
1310	int i, remove_vcc = 1;
1311
1312	if (!to_remove)
1313		return -1;
1314
1315	hlist_del(&to_remove->next);
1316	del_timer(&to_remove->timer);
1317
1318	/*
1319	 * If this is the only MAC connected to this VCC,
1320	 * also tear down the VCC
1321	 */
1322	if (to_remove->status >= ESI_FLUSH_PENDING) {
1323		/*
1324		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1325		 */
1326		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1327			hlist_for_each_entry(entry, node,
1328					     &priv->lec_arp_tables[i], next) {
1329				if (memcmp(to_remove->atm_addr,
1330					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1331					remove_vcc = 0;
1332					break;
1333				}
1334			}
1335		}
1336		if (remove_vcc)
1337			lec_arp_clear_vccs(to_remove);
1338	}
1339	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1340
1341	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1342	return 0;
1343}
1344
1345#if DEBUG_ARP_TABLE
1346static const char *get_status_string(unsigned char st)
1347{
1348	switch (st) {
1349	case ESI_UNKNOWN:
1350		return "ESI_UNKNOWN";
1351	case ESI_ARP_PENDING:
1352		return "ESI_ARP_PENDING";
1353	case ESI_VC_PENDING:
1354		return "ESI_VC_PENDING";
1355	case ESI_FLUSH_PENDING:
1356		return "ESI_FLUSH_PENDING";
1357	case ESI_FORWARD_DIRECT:
1358		return "ESI_FORWARD_DIRECT";
1359	}
1360	return "<UNKNOWN>";
1361}
1362
1363static void dump_arp_table(struct lec_priv *priv)
1364{
1365	struct hlist_node *node;
1366	struct lec_arp_table *rulla;
1367	char buf[256];
1368	int i, j, offset;
1369
1370	pr_info("Dump %p:\n", priv);
1371	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1372		hlist_for_each_entry(rulla, node,
1373				     &priv->lec_arp_tables[i], next) {
1374			offset = 0;
1375			offset += sprintf(buf, "%d: %p\n", i, rulla);
1376			offset += sprintf(buf + offset, "Mac: %pM",
1377					  rulla->mac_addr);
1378			offset += sprintf(buf + offset, " Atm:");
1379			for (j = 0; j < ATM_ESA_LEN; j++) {
1380				offset += sprintf(buf + offset,
1381						  "%2.2x ",
1382						  rulla->atm_addr[j] & 0xff);
1383			}
1384			offset += sprintf(buf + offset,
1385					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1386					  rulla->vcc ? rulla->vcc->vpi : 0,
1387					  rulla->vcc ? rulla->vcc->vci : 0,
1388					  rulla->recv_vcc ? rulla->recv_vcc->
1389					  vpi : 0,
1390					  rulla->recv_vcc ? rulla->recv_vcc->
1391					  vci : 0, rulla->last_used,
1392					  rulla->timestamp, rulla->no_tries);
1393			offset +=
1394			    sprintf(buf + offset,
1395				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1396				    rulla->flags, rulla->packets_flooded,
1397				    get_status_string(rulla->status));
1398			pr_info("%s\n", buf);
1399		}
1400	}
1401
1402	if (!hlist_empty(&priv->lec_no_forward))
1403		pr_info("No forward\n");
1404	hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1405		offset = 0;
1406		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1407		offset += sprintf(buf + offset, " Atm:");
1408		for (j = 0; j < ATM_ESA_LEN; j++) {
1409			offset += sprintf(buf + offset, "%2.2x ",
1410					  rulla->atm_addr[j] & 0xff);
1411		}
1412		offset += sprintf(buf + offset,
1413				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1414				  rulla->vcc ? rulla->vcc->vpi : 0,
1415				  rulla->vcc ? rulla->vcc->vci : 0,
1416				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1417				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1418				  rulla->last_used,
1419				  rulla->timestamp, rulla->no_tries);
1420		offset += sprintf(buf + offset,
1421				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1422				  rulla->flags, rulla->packets_flooded,
1423				  get_status_string(rulla->status));
1424		pr_info("%s\n", buf);
1425	}
1426
1427	if (!hlist_empty(&priv->lec_arp_empty_ones))
1428		pr_info("Empty ones\n");
1429	hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1430		offset = 0;
1431		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1432		offset += sprintf(buf + offset, " Atm:");
1433		for (j = 0; j < ATM_ESA_LEN; j++) {
1434			offset += sprintf(buf + offset, "%2.2x ",
1435					  rulla->atm_addr[j] & 0xff);
1436		}
1437		offset += sprintf(buf + offset,
1438				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1439				  rulla->vcc ? rulla->vcc->vpi : 0,
1440				  rulla->vcc ? rulla->vcc->vci : 0,
1441				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1442				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1443				  rulla->last_used,
1444				  rulla->timestamp, rulla->no_tries);
1445		offset += sprintf(buf + offset,
1446				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1447				  rulla->flags, rulla->packets_flooded,
1448				  get_status_string(rulla->status));
1449		pr_info("%s", buf);
1450	}
1451
1452	if (!hlist_empty(&priv->mcast_fwds))
1453		pr_info("Multicast Forward VCCs\n");
1454	hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1455		offset = 0;
1456		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1457		offset += sprintf(buf + offset, " Atm:");
1458		for (j = 0; j < ATM_ESA_LEN; j++) {
1459			offset += sprintf(buf + offset, "%2.2x ",
1460					  rulla->atm_addr[j] & 0xff);
1461		}
1462		offset += sprintf(buf + offset,
1463				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1464				  rulla->vcc ? rulla->vcc->vpi : 0,
1465				  rulla->vcc ? rulla->vcc->vci : 0,
1466				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1467				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1468				  rulla->last_used,
1469				  rulla->timestamp, rulla->no_tries);
1470		offset += sprintf(buf + offset,
1471				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1472				  rulla->flags, rulla->packets_flooded,
1473				  get_status_string(rulla->status));
1474		pr_info("%s\n", buf);
1475	}
1476
1477}
1478#else
1479#define dump_arp_table(priv) do { } while (0)
1480#endif
1481
1482/*
1483 * Destruction of arp-cache
1484 */
1485static void lec_arp_destroy(struct lec_priv *priv)
1486{
1487	unsigned long flags;
1488	struct hlist_node *node, *next;
1489	struct lec_arp_table *entry;
1490	int i;
1491
1492	cancel_delayed_work_sync(&priv->lec_arp_work);
1493
1494	/*
1495	 * Remove all entries
1496	 */
1497
1498	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1499	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1500		hlist_for_each_entry_safe(entry, node, next,
1501					  &priv->lec_arp_tables[i], next) {
1502			lec_arp_remove(priv, entry);
1503			lec_arp_put(entry);
1504		}
1505		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1506	}
1507
1508	hlist_for_each_entry_safe(entry, node, next,
1509				  &priv->lec_arp_empty_ones, next) {
1510		del_timer_sync(&entry->timer);
1511		lec_arp_clear_vccs(entry);
1512		hlist_del(&entry->next);
1513		lec_arp_put(entry);
1514	}
1515	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1516
1517	hlist_for_each_entry_safe(entry, node, next,
1518				  &priv->lec_no_forward, next) {
1519		del_timer_sync(&entry->timer);
1520		lec_arp_clear_vccs(entry);
1521		hlist_del(&entry->next);
1522		lec_arp_put(entry);
1523	}
1524	INIT_HLIST_HEAD(&priv->lec_no_forward);
1525
1526	hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1527		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1528		lec_arp_clear_vccs(entry);
1529		hlist_del(&entry->next);
1530		lec_arp_put(entry);
1531	}
1532	INIT_HLIST_HEAD(&priv->mcast_fwds);
1533	priv->mcast_vcc = NULL;
1534	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1535}
1536
1537/*
1538 * Find entry by mac_address
1539 */
1540static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1541					  const unsigned char *mac_addr)
1542{
1543	struct hlist_node *node;
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, node, 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	memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
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 = (struct lec_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 *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, node, 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 *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, node, 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 *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, node, 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					memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
 
1890					entry->last_used = jiffies;
1891					lec_arp_add(priv, entry);
1892				}
1893				if (remoteflag)
1894					entry->flags |= LEC_REMOTE_FLAG;
1895				else
1896					entry->flags &= ~LEC_REMOTE_FLAG;
1897				pr_debug("After update\n");
1898				dump_arp_table(priv);
1899				goto out;
1900			}
1901		}
1902	}
1903
1904	entry = lec_arp_find(priv, mac_addr);
1905	if (!entry) {
1906		entry = make_entry(priv, mac_addr);
1907		if (!entry)
1908			goto out;
1909		entry->status = ESI_UNKNOWN;
1910		lec_arp_add(priv, entry);
1911		/* Temporary, changes before end of function */
1912	}
1913	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1914	del_timer(&entry->timer);
1915	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1916		hlist_for_each_entry(tmp, node,
1917				     &priv->lec_arp_tables[i], next) {
1918			if (entry != tmp &&
1919			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1920				/* Vcc to this host exists */
1921				if (tmp->status > ESI_VC_PENDING) {
1922					/*
1923					 * ESI_FLUSH_PENDING,
1924					 * ESI_FORWARD_DIRECT
1925					 */
1926					entry->vcc = tmp->vcc;
1927					entry->old_push = tmp->old_push;
1928				}
1929				entry->status = tmp->status;
1930				break;
1931			}
1932		}
1933	}
1934	if (remoteflag)
1935		entry->flags |= LEC_REMOTE_FLAG;
1936	else
1937		entry->flags &= ~LEC_REMOTE_FLAG;
1938	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1939		entry->status = ESI_VC_PENDING;
1940		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1941	}
1942	pr_debug("After update2\n");
1943	dump_arp_table(priv);
1944out:
1945	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1946}
1947
1948/*
1949 * Notifies: Vcc setup ready
1950 */
1951static void
1952lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1953	      struct atm_vcc *vcc,
1954	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1955{
1956	unsigned long flags;
1957	struct hlist_node *node;
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		memset(entry->mac_addr, 0, ETH_ALEN);
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, node,
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	memset(entry->mac_addr, 0, ETH_ALEN);
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 hlist_node *node;
2105	struct lec_arp_table *entry;
2106	int i;
2107
2108	pr_debug("%lx\n", tran_id);
2109restart:
2110	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2111	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2112		hlist_for_each_entry(entry, node,
2113				     &priv->lec_arp_tables[i], next) {
2114			if (entry->flush_tran_id == tran_id &&
2115			    entry->status == ESI_FLUSH_PENDING) {
2116				struct sk_buff *skb;
2117				struct atm_vcc *vcc = entry->vcc;
2118
2119				lec_arp_hold(entry);
2120				spin_unlock_irqrestore(&priv->lec_arp_lock,
2121						       flags);
2122				while ((skb = skb_dequeue(&entry->tx_wait)))
2123					lec_send(vcc, skb);
2124				entry->last_used = jiffies;
2125				entry->status = ESI_FORWARD_DIRECT;
2126				lec_arp_put(entry);
2127				pr_debug("LEC_ARP: Flushed\n");
2128				goto restart;
2129			}
2130		}
2131	}
2132	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2133	dump_arp_table(priv);
2134}
2135
2136static void
2137lec_set_flush_tran_id(struct lec_priv *priv,
2138		      const unsigned char *atm_addr, unsigned long tran_id)
2139{
2140	unsigned long flags;
2141	struct hlist_node *node;
2142	struct lec_arp_table *entry;
2143	int i;
2144
2145	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2146	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2147		hlist_for_each_entry(entry, node,
2148				     &priv->lec_arp_tables[i], next) {
2149			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2150				entry->flush_tran_id = tran_id;
2151				pr_debug("Set flush transaction id to %lx for %p\n",
2152					 tran_id, entry);
2153			}
2154		}
2155	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2156}
2157
2158static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2159{
2160	unsigned long flags;
2161	unsigned char mac_addr[] = {
2162		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2163	};
2164	struct lec_arp_table *to_add;
2165	struct lec_vcc_priv *vpriv;
2166	int err = 0;
2167
2168	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2169	if (!vpriv)
2170		return -ENOMEM;
2171	vpriv->xoff = 0;
2172	vpriv->old_pop = vcc->pop;
2173	vcc->user_back = vpriv;
2174	vcc->pop = lec_pop;
2175	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2176	to_add = make_entry(priv, mac_addr);
2177	if (!to_add) {
2178		vcc->pop = vpriv->old_pop;
2179		kfree(vpriv);
2180		err = -ENOMEM;
2181		goto out;
2182	}
2183	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2184	to_add->status = ESI_FORWARD_DIRECT;
2185	to_add->flags |= LEC_PERMANENT_FLAG;
2186	to_add->vcc = vcc;
2187	to_add->old_push = vcc->push;
2188	vcc->push = lec_push;
2189	priv->mcast_vcc = vcc;
2190	lec_arp_add(priv, to_add);
2191out:
2192	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2193	return err;
2194}
2195
2196static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2197{
2198	unsigned long flags;
2199	struct hlist_node *node, *next;
2200	struct lec_arp_table *entry;
2201	int i;
2202
2203	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2204	dump_arp_table(priv);
2205
2206	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2207
2208	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2209		hlist_for_each_entry_safe(entry, node, next,
2210					  &priv->lec_arp_tables[i], next) {
2211			if (vcc == entry->vcc) {
2212				lec_arp_remove(priv, entry);
2213				lec_arp_put(entry);
2214				if (priv->mcast_vcc == vcc)
2215					priv->mcast_vcc = NULL;
2216			}
2217		}
2218	}
2219
2220	hlist_for_each_entry_safe(entry, node, next,
2221				  &priv->lec_arp_empty_ones, next) {
2222		if (entry->vcc == vcc) {
2223			lec_arp_clear_vccs(entry);
2224			del_timer(&entry->timer);
2225			hlist_del(&entry->next);
2226			lec_arp_put(entry);
2227		}
2228	}
2229
2230	hlist_for_each_entry_safe(entry, node, next,
2231				  &priv->lec_no_forward, next) {
2232		if (entry->recv_vcc == vcc) {
2233			lec_arp_clear_vccs(entry);
2234			del_timer(&entry->timer);
2235			hlist_del(&entry->next);
2236			lec_arp_put(entry);
2237		}
2238	}
2239
2240	hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2241		if (entry->recv_vcc == vcc) {
2242			lec_arp_clear_vccs(entry);
2243			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2244			hlist_del(&entry->next);
2245			lec_arp_put(entry);
2246		}
2247	}
2248
2249	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2250	dump_arp_table(priv);
2251}
2252
2253static void
2254lec_arp_check_empties(struct lec_priv *priv,
2255		      struct atm_vcc *vcc, struct sk_buff *skb)
2256{
2257	unsigned long flags;
2258	struct hlist_node *node, *next;
2259	struct lec_arp_table *entry, *tmp;
2260	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2261	unsigned char *src = hdr->h_source;
2262
2263	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2264	hlist_for_each_entry_safe(entry, node, next,
2265				  &priv->lec_arp_empty_ones, next) {
2266		if (vcc == entry->vcc) {
2267			del_timer(&entry->timer);
2268			memcpy(entry->mac_addr, src, ETH_ALEN);
2269			entry->status = ESI_FORWARD_DIRECT;
2270			entry->last_used = jiffies;
2271			/* We might have got an entry */
2272			tmp = lec_arp_find(priv, src);
2273			if (tmp) {
2274				lec_arp_remove(priv, tmp);
2275				lec_arp_put(tmp);
2276			}
2277			hlist_del(&entry->next);
2278			lec_arp_add(priv, entry);
2279			goto out;
2280		}
2281	}
2282	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2283out:
2284	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2285}
2286
2287MODULE_LICENSE("GPL");