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/* TokenRing if needed */
  30#ifdef CONFIG_TR
  31#include <linux/trdevice.h>
  32#endif
  33
  34/* And atm device */
  35#include <linux/atmdev.h>
  36#include <linux/atmlec.h>
  37
  38/* Proxy LEC knows about bridging */
  39#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  40#include "../bridge/br_private.h"
  41
  42static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  43#endif
  44
  45/* Modular too */
  46#include <linux/module.h>
  47#include <linux/init.h>
  48
  49#include "lec.h"
  50#include "lec_arpc.h"
  51#include "resources.h"
  52
  53#define DUMP_PACKETS 0		/*
  54				 * 0 = None,
  55				 * 1 = 30 first bytes
  56				 * 2 = Whole packet
  57				 */
  58
  59#define LEC_UNRES_QUE_LEN 8	/*
  60				 * number of tx packets to queue for a
  61				 * single destination while waiting for SVC
  62				 */
  63
  64static int lec_open(struct net_device *dev);
  65static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  66				  struct net_device *dev);
  67static int lec_close(struct net_device *dev);
  68static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  69					  const unsigned char *mac_addr);
  70static int lec_arp_remove(struct lec_priv *priv,
  71			  struct lec_arp_table *to_remove);
  72/* LANE2 functions */
  73static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  74				const u8 *tlvs, u32 sizeoftlvs);
  75static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  76			 u8 **tlvs, u32 *sizeoftlvs);
  77static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  78			       const u8 *tlvs, u32 sizeoftlvs);
  79
  80static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  81			   unsigned long permanent);
  82static void lec_arp_check_empties(struct lec_priv *priv,
  83				  struct atm_vcc *vcc, struct sk_buff *skb);
  84static void lec_arp_destroy(struct lec_priv *priv);
  85static void lec_arp_init(struct lec_priv *priv);
  86static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  87				       const unsigned char *mac_to_find,
  88				       int is_rdesc,
  89				       struct lec_arp_table **ret_entry);
  90static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  91			   const unsigned char *atm_addr,
  92			   unsigned long remoteflag,
  93			   unsigned int targetless_le_arp);
  94static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  95static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  96static void lec_set_flush_tran_id(struct lec_priv *priv,
  97				  const unsigned char *atm_addr,
  98				  unsigned long tran_id);
  99static void lec_vcc_added(struct lec_priv *priv,
 100			  const struct atmlec_ioc *ioc_data,
 101			  struct atm_vcc *vcc,
 102			  void (*old_push)(struct atm_vcc *vcc,
 103					   struct sk_buff *skb));
 104static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 105
 106/* must be done under lec_arp_lock */
 107static inline void lec_arp_hold(struct lec_arp_table *entry)
 108{
 109	atomic_inc(&entry->usage);
 110}
 111
 112static inline void lec_arp_put(struct lec_arp_table *entry)
 113{
 114	if (atomic_dec_and_test(&entry->usage))
 115		kfree(entry);
 116}
 117
 118static struct lane2_ops lane2_ops = {
 119	lane2_resolve,		/* resolve,             spec 3.1.3 */
 120	lane2_associate_req,	/* associate_req,       spec 3.1.4 */
 121	NULL			/* associate indicator, spec 3.1.5 */
 122};
 123
 124static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 125
 126/* Device structures */
 127static struct net_device *dev_lec[MAX_LEC_ITF];
 128
 129#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 130static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 131{
 132	char *buff;
 133	struct lec_priv *priv;
 134
 135	/*
 136	 * Check if this is a BPDU. If so, ask zeppelin to send
 137	 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 138	 * as the Config BPDU has
 139	 */
 140	buff = skb->data + skb->dev->hard_header_len;
 141	if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 142		struct sock *sk;
 143		struct sk_buff *skb2;
 144		struct atmlec_msg *mesg;
 145
 146		skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 147		if (skb2 == NULL)
 148			return;
 149		skb2->len = sizeof(struct atmlec_msg);
 150		mesg = (struct atmlec_msg *)skb2->data;
 151		mesg->type = l_topology_change;
 152		buff += 4;
 153		mesg->content.normal.flag = *buff & 0x01;
 154					/* 0x01 is topology change */
 155
 156		priv = netdev_priv(dev);
 157		atm_force_charge(priv->lecd, skb2->truesize);
 158		sk = sk_atm(priv->lecd);
 159		skb_queue_tail(&sk->sk_receive_queue, skb2);
 160		sk->sk_data_ready(sk, skb2->len);
 161	}
 162}
 163#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 164
 165/*
 166 * Modelled after tr_type_trans
 167 * All multicast and ARE or STE frames go to BUS.
 168 * Non source routed frames go by destination address.
 169 * Last hop source routed frames go by destination address.
 170 * Not last hop source routed frames go by _next_ route descriptor.
 171 * Returns pointer to destination MAC address or fills in rdesc
 172 * and returns NULL.
 173 */
 174#ifdef CONFIG_TR
 175static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 176{
 177	struct trh_hdr *trh;
 178	unsigned int riflen, num_rdsc;
 179
 180	trh = (struct trh_hdr *)packet;
 181	if (trh->daddr[0] & (uint8_t) 0x80)
 182		return bus_mac;	/* multicast */
 183
 184	if (trh->saddr[0] & TR_RII) {
 185		riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 186		if ((ntohs(trh->rcf) >> 13) != 0)
 187			return bus_mac;	/* ARE or STE */
 188	} else
 189		return trh->daddr;	/* not source routed */
 190
 191	if (riflen < 6)
 192		return trh->daddr;	/* last hop, source routed */
 193
 194	/* riflen is 6 or more, packet has more than one route descriptor */
 195	num_rdsc = (riflen / 2) - 1;
 196	memset(rdesc, 0, ETH_ALEN);
 197	/* offset 4 comes from LAN destination field in LE control frames */
 198	if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 199		memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 200	else {
 201		memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 202		rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 203	}
 204
 205	return NULL;
 206}
 207#endif /* CONFIG_TR */
 208
 209/*
 210 * Open/initialize the netdevice. This is called (in the current kernel)
 211 * sometime after booting when the 'ifconfig' program is run.
 212 *
 213 * This routine should set everything up anew at each open, even
 214 * registers that "should" only need to be set once at boot, so that
 215 * there is non-reboot way to recover if something goes wrong.
 216 */
 217
 218static int lec_open(struct net_device *dev)
 219{
 220	netif_start_queue(dev);
 221
 222	return 0;
 223}
 224
 225static void
 226lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 227{
 228	struct net_device *dev = skb->dev;
 229
 230	ATM_SKB(skb)->vcc = vcc;
 231	ATM_SKB(skb)->atm_options = vcc->atm_options;
 232
 233	atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 234	if (vcc->send(vcc, skb) < 0) {
 235		dev->stats.tx_dropped++;
 236		return;
 237	}
 238
 239	dev->stats.tx_packets++;
 240	dev->stats.tx_bytes += skb->len;
 241}
 242
 243static void lec_tx_timeout(struct net_device *dev)
 244{
 245	pr_info("%s\n", dev->name);
 246	dev->trans_start = jiffies;
 247	netif_wake_queue(dev);
 248}
 249
 250static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 251				  struct net_device *dev)
 252{
 253	struct sk_buff *skb2;
 254	struct lec_priv *priv = netdev_priv(dev);
 255	struct lecdatahdr_8023 *lec_h;
 256	struct atm_vcc *vcc;
 257	struct lec_arp_table *entry;
 258	unsigned char *dst;
 259	int min_frame_size;
 260#ifdef CONFIG_TR
 261	unsigned char rdesc[ETH_ALEN];	/* Token Ring route descriptor */
 262#endif
 263	int is_rdesc;
 264
 265	pr_debug("called\n");
 266	if (!priv->lecd) {
 267		pr_info("%s:No lecd attached\n", dev->name);
 268		dev->stats.tx_errors++;
 269		netif_stop_queue(dev);
 270		kfree_skb(skb);
 271		return NETDEV_TX_OK;
 272	}
 273
 274	pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 275		 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 276		 (long)skb_end_pointer(skb));
 277#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 278	if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 279		lec_handle_bridge(skb, dev);
 280#endif
 281
 282	/* Make sure we have room for lec_id */
 283	if (skb_headroom(skb) < 2) {
 284		pr_debug("reallocating skb\n");
 285		skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 286		kfree_skb(skb);
 287		if (skb2 == NULL)
 288			return NETDEV_TX_OK;
 
 
 289		skb = skb2;
 290	}
 291	skb_push(skb, 2);
 292
 293	/* Put le header to place, works for TokenRing too */
 294	lec_h = (struct lecdatahdr_8023 *)skb->data;
 295	lec_h->le_header = htons(priv->lecid);
 296
 297#ifdef CONFIG_TR
 298	/*
 299	 * Ugly. Use this to realign Token Ring packets for
 300	 * e.g. PCA-200E driver.
 301	 */
 302	if (priv->is_trdev) {
 303		skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 304		kfree_skb(skb);
 305		if (skb2 == NULL)
 306			return NETDEV_TX_OK;
 307		skb = skb2;
 308	}
 309#endif
 310
 311#if DUMP_PACKETS >= 2
 312#define MAX_DUMP_SKB 99
 313#elif DUMP_PACKETS >= 1
 314#define MAX_DUMP_SKB 30
 315#endif
 316#if DUMP_PACKETS >= 1
 317	printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 318	       dev->name, skb->len, priv->lecid);
 319	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 320		       skb->data, min(skb->len, MAX_DUMP_SKB), true);
 321#endif /* DUMP_PACKETS >= 1 */
 322
 323	/* Minimum ethernet-frame size */
 324#ifdef CONFIG_TR
 325	if (priv->is_trdev)
 326		min_frame_size = LEC_MINIMUM_8025_SIZE;
 327	else
 328#endif
 329		min_frame_size = LEC_MINIMUM_8023_SIZE;
 330	if (skb->len < min_frame_size) {
 331		if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 332			skb2 = skb_copy_expand(skb, 0,
 333					       min_frame_size - skb->truesize,
 334					       GFP_ATOMIC);
 335			dev_kfree_skb(skb);
 336			if (skb2 == NULL) {
 337				dev->stats.tx_dropped++;
 338				return NETDEV_TX_OK;
 339			}
 340			skb = skb2;
 341		}
 342		skb_put(skb, min_frame_size - skb->len);
 343	}
 344
 345	/* Send to right vcc */
 346	is_rdesc = 0;
 347	dst = lec_h->h_dest;
 348#ifdef CONFIG_TR
 349	if (priv->is_trdev) {
 350		dst = get_tr_dst(skb->data + 2, rdesc);
 351		if (dst == NULL) {
 352			dst = rdesc;
 353			is_rdesc = 1;
 354		}
 355	}
 356#endif
 357	entry = NULL;
 358	vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 359	pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 360		 dev->name, vcc, vcc ? vcc->flags : 0, entry);
 361	if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 362		if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 363			pr_debug("%s:queuing packet, MAC address %pM\n",
 364				 dev->name, lec_h->h_dest);
 365			skb_queue_tail(&entry->tx_wait, skb);
 366		} else {
 367			pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 368				 dev->name, lec_h->h_dest);
 369			dev->stats.tx_dropped++;
 370			dev_kfree_skb(skb);
 371		}
 372		goto out;
 373	}
 374#if DUMP_PACKETS > 0
 375	printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 376	       dev->name, vcc->vpi, vcc->vci);
 377#endif /* DUMP_PACKETS > 0 */
 378
 379	while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 380		pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 381		lec_send(vcc, skb2);
 382	}
 383
 384	lec_send(vcc, skb);
 385
 386	if (!atm_may_send(vcc, 0)) {
 387		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 388
 389		vpriv->xoff = 1;
 390		netif_stop_queue(dev);
 391
 392		/*
 393		 * vcc->pop() might have occurred in between, making
 394		 * the vcc usuable again.  Since xmit is serialized,
 395		 * this is the only situation we have to re-test.
 396		 */
 397
 398		if (atm_may_send(vcc, 0))
 399			netif_wake_queue(dev);
 400	}
 401
 402out:
 403	if (entry)
 404		lec_arp_put(entry);
 405	dev->trans_start = jiffies;
 406	return NETDEV_TX_OK;
 407}
 408
 409/* The inverse routine to net_open(). */
 410static int lec_close(struct net_device *dev)
 411{
 412	netif_stop_queue(dev);
 413	return 0;
 414}
 415
 416static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 417{
 418	unsigned long flags;
 419	struct net_device *dev = (struct net_device *)vcc->proto_data;
 420	struct lec_priv *priv = netdev_priv(dev);
 421	struct atmlec_msg *mesg;
 422	struct lec_arp_table *entry;
 423	int i;
 424	char *tmp;		/* FIXME */
 425
 426	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 427	mesg = (struct atmlec_msg *)skb->data;
 428	tmp = skb->data;
 429	tmp += sizeof(struct atmlec_msg);
 430	pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 431	switch (mesg->type) {
 432	case l_set_mac_addr:
 433		for (i = 0; i < 6; i++)
 434			dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 435		break;
 436	case l_del_mac_addr:
 437		for (i = 0; i < 6; i++)
 438			dev->dev_addr[i] = 0;
 439		break;
 440	case l_addr_delete:
 441		lec_addr_delete(priv, mesg->content.normal.atm_addr,
 442				mesg->content.normal.flag);
 443		break;
 444	case l_topology_change:
 445		priv->topology_change = mesg->content.normal.flag;
 446		break;
 447	case l_flush_complete:
 448		lec_flush_complete(priv, mesg->content.normal.flag);
 449		break;
 450	case l_narp_req:	/* LANE2: see 7.1.35 in the lane2 spec */
 451		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 452		entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 453		lec_arp_remove(priv, entry);
 454		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 455
 456		if (mesg->content.normal.no_source_le_narp)
 457			break;
 458		/* FALL THROUGH */
 459	case l_arp_update:
 460		lec_arp_update(priv, mesg->content.normal.mac_addr,
 461			       mesg->content.normal.atm_addr,
 462			       mesg->content.normal.flag,
 463			       mesg->content.normal.targetless_le_arp);
 464		pr_debug("in l_arp_update\n");
 465		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
 466			pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 467				 mesg->sizeoftlvs);
 468			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 469					    tmp, mesg->sizeoftlvs);
 470		}
 471		break;
 472	case l_config:
 473		priv->maximum_unknown_frame_count =
 474		    mesg->content.config.maximum_unknown_frame_count;
 475		priv->max_unknown_frame_time =
 476		    (mesg->content.config.max_unknown_frame_time * HZ);
 477		priv->max_retry_count = mesg->content.config.max_retry_count;
 478		priv->aging_time = (mesg->content.config.aging_time * HZ);
 479		priv->forward_delay_time =
 480		    (mesg->content.config.forward_delay_time * HZ);
 481		priv->arp_response_time =
 482		    (mesg->content.config.arp_response_time * HZ);
 483		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 484		priv->path_switching_delay =
 485		    (mesg->content.config.path_switching_delay * HZ);
 486		priv->lane_version = mesg->content.config.lane_version;
 487					/* LANE2 */
 488		priv->lane2_ops = NULL;
 489		if (priv->lane_version > 1)
 490			priv->lane2_ops = &lane2_ops;
 
 491		if (dev_set_mtu(dev, mesg->content.config.mtu))
 492			pr_info("%s: change_mtu to %d failed\n",
 493				dev->name, mesg->content.config.mtu);
 
 494		priv->is_proxy = mesg->content.config.is_proxy;
 495		break;
 496	case l_flush_tran_id:
 497		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 498				      mesg->content.normal.flag);
 499		break;
 500	case l_set_lecid:
 501		priv->lecid =
 502		    (unsigned short)(0xffff & mesg->content.normal.flag);
 503		break;
 504	case l_should_bridge:
 505#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 506	{
 507		pr_debug("%s: bridge zeppelin asks about %pM\n",
 508			 dev->name, mesg->content.proxy.mac_addr);
 509
 510		if (br_fdb_test_addr_hook == NULL)
 511			break;
 512
 513		if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 514			/* hit from bridge table, send LE_ARP_RESPONSE */
 515			struct sk_buff *skb2;
 516			struct sock *sk;
 517
 518			pr_debug("%s: entry found, responding to zeppelin\n",
 519				 dev->name);
 520			skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 521			if (skb2 == NULL)
 522				break;
 523			skb2->len = sizeof(struct atmlec_msg);
 524			skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 525			atm_force_charge(priv->lecd, skb2->truesize);
 526			sk = sk_atm(priv->lecd);
 527			skb_queue_tail(&sk->sk_receive_queue, skb2);
 528			sk->sk_data_ready(sk, skb2->len);
 529		}
 530	}
 531#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 532		break;
 533	default:
 534		pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 535		dev_kfree_skb(skb);
 536		return -EINVAL;
 537	}
 538	dev_kfree_skb(skb);
 539	return 0;
 540}
 541
 542static void lec_atm_close(struct atm_vcc *vcc)
 543{
 544	struct sk_buff *skb;
 545	struct net_device *dev = (struct net_device *)vcc->proto_data;
 546	struct lec_priv *priv = netdev_priv(dev);
 547
 548	priv->lecd = NULL;
 549	/* Do something needful? */
 550
 551	netif_stop_queue(dev);
 552	lec_arp_destroy(priv);
 553
 554	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 555		pr_info("%s closing with messages pending\n", dev->name);
 556	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 557		atm_return(vcc, skb->truesize);
 558		dev_kfree_skb(skb);
 559	}
 560
 561	pr_info("%s: Shut down!\n", dev->name);
 562	module_put(THIS_MODULE);
 563}
 564
 565static struct atmdev_ops lecdev_ops = {
 566	.close = lec_atm_close,
 567	.send = lec_atm_send
 568};
 569
 570static struct atm_dev lecatm_dev = {
 571	.ops = &lecdev_ops,
 572	.type = "lec",
 573	.number = 999,		/* dummy device number */
 574	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 575};
 576
 577/*
 578 * LANE2: new argument struct sk_buff *data contains
 579 * the LE_ARP based TLVs introduced in the LANE2 spec
 580 */
 581static int
 582send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 583	     const unsigned char *mac_addr, const unsigned char *atm_addr,
 584	     struct sk_buff *data)
 585{
 586	struct sock *sk;
 587	struct sk_buff *skb;
 588	struct atmlec_msg *mesg;
 589
 590	if (!priv || !priv->lecd)
 591		return -1;
 592	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 593	if (!skb)
 594		return -1;
 595	skb->len = sizeof(struct atmlec_msg);
 596	mesg = (struct atmlec_msg *)skb->data;
 597	memset(mesg, 0, sizeof(struct atmlec_msg));
 598	mesg->type = type;
 599	if (data != NULL)
 600		mesg->sizeoftlvs = data->len;
 601	if (mac_addr)
 602		memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 603	else
 604		mesg->content.normal.targetless_le_arp = 1;
 605	if (atm_addr)
 606		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 607
 608	atm_force_charge(priv->lecd, skb->truesize);
 609	sk = sk_atm(priv->lecd);
 610	skb_queue_tail(&sk->sk_receive_queue, skb);
 611	sk->sk_data_ready(sk, skb->len);
 612
 613	if (data != NULL) {
 614		pr_debug("about to send %d bytes of data\n", data->len);
 615		atm_force_charge(priv->lecd, data->truesize);
 616		skb_queue_tail(&sk->sk_receive_queue, data);
 617		sk->sk_data_ready(sk, skb->len);
 618	}
 619
 620	return 0;
 621}
 622
 623/* shamelessly stolen from drivers/net/net_init.c */
 624static int lec_change_mtu(struct net_device *dev, int new_mtu)
 625{
 626	if ((new_mtu < 68) || (new_mtu > 18190))
 627		return -EINVAL;
 628	dev->mtu = new_mtu;
 629	return 0;
 630}
 631
 632static void lec_set_multicast_list(struct net_device *dev)
 633{
 634	/*
 635	 * by default, all multicast frames arrive over the bus.
 636	 * eventually support selective multicast service
 637	 */
 638}
 639
 640static const struct net_device_ops lec_netdev_ops = {
 641	.ndo_open		= lec_open,
 642	.ndo_stop		= lec_close,
 643	.ndo_start_xmit		= lec_start_xmit,
 644	.ndo_change_mtu		= lec_change_mtu,
 645	.ndo_tx_timeout		= lec_tx_timeout,
 646	.ndo_set_multicast_list	= lec_set_multicast_list,
 647};
 648
 649static const unsigned char lec_ctrl_magic[] = {
 650	0xff,
 651	0x00,
 652	0x01,
 653	0x01
 654};
 655
 656#define LEC_DATA_DIRECT_8023  2
 657#define LEC_DATA_DIRECT_8025  3
 658
 659static int lec_is_data_direct(struct atm_vcc *vcc)
 660{
 661	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 662		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 663}
 664
 665static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 666{
 667	unsigned long flags;
 668	struct net_device *dev = (struct net_device *)vcc->proto_data;
 669	struct lec_priv *priv = netdev_priv(dev);
 670
 671#if DUMP_PACKETS > 0
 672	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 673	       dev->name, vcc->vpi, vcc->vci);
 674#endif
 675	if (!skb) {
 676		pr_debug("%s: null skb\n", dev->name);
 677		lec_vcc_close(priv, vcc);
 678		return;
 679	}
 680#if DUMP_PACKETS >= 2
 681#define MAX_SKB_DUMP 99
 682#elif DUMP_PACKETS >= 1
 683#define MAX_SKB_DUMP 30
 684#endif
 685#if DUMP_PACKETS > 0
 686	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 687	       dev->name, skb->len, priv->lecid);
 688	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 689		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 690#endif /* DUMP_PACKETS > 0 */
 691	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 692				/* Control frame, to daemon */
 693		struct sock *sk = sk_atm(vcc);
 694
 695		pr_debug("%s: To daemon\n", dev->name);
 696		skb_queue_tail(&sk->sk_receive_queue, skb);
 697		sk->sk_data_ready(sk, skb->len);
 698	} else {		/* Data frame, queue to protocol handlers */
 699		struct lec_arp_table *entry;
 700		unsigned char *src, *dst;
 701
 702		atm_return(vcc, skb->truesize);
 703		if (*(__be16 *) skb->data == htons(priv->lecid) ||
 704		    !priv->lecd || !(dev->flags & IFF_UP)) {
 705			/*
 706			 * Probably looping back, or if lecd is missing,
 707			 * lecd has gone down
 708			 */
 709			pr_debug("Ignoring frame...\n");
 710			dev_kfree_skb(skb);
 711			return;
 712		}
 713#ifdef CONFIG_TR
 714		if (priv->is_trdev)
 715			dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 716		else
 717#endif
 718			dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 719
 720		/*
 721		 * If this is a Data Direct VCC, and the VCC does not match
 722		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 723		 */
 724		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 725		if (lec_is_data_direct(vcc)) {
 726#ifdef CONFIG_TR
 727			if (priv->is_trdev)
 728				src =
 729				    ((struct lecdatahdr_8025 *)skb->data)->
 730				    h_source;
 731			else
 732#endif
 733				src =
 734				    ((struct lecdatahdr_8023 *)skb->data)->
 735				    h_source;
 736			entry = lec_arp_find(priv, src);
 737			if (entry && entry->vcc != vcc) {
 738				lec_arp_remove(priv, entry);
 739				lec_arp_put(entry);
 740			}
 741		}
 742		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 743
 744		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
 745		    !priv->is_proxy &&	/* Proxy wants all the packets */
 746		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 747			dev_kfree_skb(skb);
 748			return;
 749		}
 750		if (!hlist_empty(&priv->lec_arp_empty_ones))
 751			lec_arp_check_empties(priv, vcc, skb);
 752		skb_pull(skb, 2);	/* skip lec_id */
 753#ifdef CONFIG_TR
 754		if (priv->is_trdev)
 755			skb->protocol = tr_type_trans(skb, dev);
 756		else
 757#endif
 758			skb->protocol = eth_type_trans(skb, dev);
 759		dev->stats.rx_packets++;
 760		dev->stats.rx_bytes += skb->len;
 761		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 762		netif_rx(skb);
 763	}
 764}
 765
 766static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 767{
 768	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 769	struct net_device *dev = skb->dev;
 770
 771	if (vpriv == NULL) {
 772		pr_info("vpriv = NULL!?!?!?\n");
 773		return;
 774	}
 775
 776	vpriv->old_pop(vcc, skb);
 777
 778	if (vpriv->xoff && atm_may_send(vcc, 0)) {
 779		vpriv->xoff = 0;
 780		if (netif_running(dev) && netif_queue_stopped(dev))
 781			netif_wake_queue(dev);
 782	}
 783}
 784
 785static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 786{
 787	struct lec_vcc_priv *vpriv;
 788	int bytes_left;
 789	struct atmlec_ioc ioc_data;
 790
 791	/* Lecd must be up in this case */
 792	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 793	if (bytes_left != 0)
 794		pr_info("copy from user failed for %d bytes\n", bytes_left);
 795	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 796	    !dev_lec[ioc_data.dev_num])
 797		return -EINVAL;
 798	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 799	if (!vpriv)
 800		return -ENOMEM;
 801	vpriv->xoff = 0;
 802	vpriv->old_pop = vcc->pop;
 803	vcc->user_back = vpriv;
 804	vcc->pop = lec_pop;
 805	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 806		      &ioc_data, vcc, vcc->push);
 807	vcc->proto_data = dev_lec[ioc_data.dev_num];
 808	vcc->push = lec_push;
 809	return 0;
 810}
 811
 812static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 813{
 814	if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 815		return -EINVAL;
 816	vcc->proto_data = dev_lec[arg];
 817	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 818}
 819
 820/* Initialize device. */
 821static int lecd_attach(struct atm_vcc *vcc, int arg)
 822{
 823	int i;
 824	struct lec_priv *priv;
 825
 826	if (arg < 0)
 827		i = 0;
 828	else
 829		i = arg;
 830#ifdef CONFIG_TR
 831	if (arg >= MAX_LEC_ITF)
 832		return -EINVAL;
 833#else				/* Reserve the top NUM_TR_DEVS for TR */
 834	if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 835		return -EINVAL;
 836#endif
 837	if (!dev_lec[i]) {
 838		int is_trdev, size;
 839
 840		is_trdev = 0;
 841		if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 842			is_trdev = 1;
 843
 844		size = sizeof(struct lec_priv);
 845#ifdef CONFIG_TR
 846		if (is_trdev)
 847			dev_lec[i] = alloc_trdev(size);
 848		else
 849#endif
 850			dev_lec[i] = alloc_etherdev(size);
 851		if (!dev_lec[i])
 852			return -ENOMEM;
 853		dev_lec[i]->netdev_ops = &lec_netdev_ops;
 854		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 855		if (register_netdev(dev_lec[i])) {
 856			free_netdev(dev_lec[i]);
 857			return -EINVAL;
 858		}
 859
 860		priv = netdev_priv(dev_lec[i]);
 861		priv->is_trdev = is_trdev;
 862	} else {
 863		priv = netdev_priv(dev_lec[i]);
 864		if (priv->lecd)
 865			return -EADDRINUSE;
 866	}
 867	lec_arp_init(priv);
 868	priv->itfnum = i;	/* LANE2 addition */
 869	priv->lecd = vcc;
 870	vcc->dev = &lecatm_dev;
 871	vcc_insert_socket(sk_atm(vcc));
 872
 873	vcc->proto_data = dev_lec[i];
 874	set_bit(ATM_VF_META, &vcc->flags);
 875	set_bit(ATM_VF_READY, &vcc->flags);
 876
 877	/* Set default values to these variables */
 878	priv->maximum_unknown_frame_count = 1;
 879	priv->max_unknown_frame_time = (1 * HZ);
 880	priv->vcc_timeout_period = (1200 * HZ);
 881	priv->max_retry_count = 1;
 882	priv->aging_time = (300 * HZ);
 883	priv->forward_delay_time = (15 * HZ);
 884	priv->topology_change = 0;
 885	priv->arp_response_time = (1 * HZ);
 886	priv->flush_timeout = (4 * HZ);
 887	priv->path_switching_delay = (6 * HZ);
 888
 889	if (dev_lec[i]->flags & IFF_UP)
 890		netif_start_queue(dev_lec[i]);
 891	__module_get(THIS_MODULE);
 892	return i;
 893}
 894
 895#ifdef CONFIG_PROC_FS
 896static const char *lec_arp_get_status_string(unsigned char status)
 897{
 898	static const char *const lec_arp_status_string[] = {
 899		"ESI_UNKNOWN       ",
 900		"ESI_ARP_PENDING   ",
 901		"ESI_VC_PENDING    ",
 902		"<Undefined>       ",
 903		"ESI_FLUSH_PENDING ",
 904		"ESI_FORWARD_DIRECT"
 905	};
 906
 907	if (status > ESI_FORWARD_DIRECT)
 908		status = 3;	/* ESI_UNDEFINED */
 909	return lec_arp_status_string[status];
 910}
 911
 912static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 913{
 914	int i;
 915
 916	for (i = 0; i < ETH_ALEN; i++)
 917		seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 918	seq_printf(seq, " ");
 919	for (i = 0; i < ATM_ESA_LEN; i++)
 920		seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 921	seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 922		   entry->flags & 0xffff);
 923	if (entry->vcc)
 924		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 925	else
 926		seq_printf(seq, "        ");
 927	if (entry->recv_vcc) {
 928		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 929			   entry->recv_vcc->vci);
 930	}
 931	seq_putc(seq, '\n');
 932}
 933
 934struct lec_state {
 935	unsigned long flags;
 936	struct lec_priv *locked;
 937	struct hlist_node *node;
 938	struct net_device *dev;
 939	int itf;
 940	int arp_table;
 941	int misc_table;
 942};
 943
 944static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 945			  loff_t *l)
 946{
 947	struct hlist_node *e = state->node;
 948	struct lec_arp_table *tmp;
 949
 950	if (!e)
 951		e = tbl->first;
 952	if (e == SEQ_START_TOKEN) {
 953		e = tbl->first;
 954		--*l;
 955	}
 956
 957	hlist_for_each_entry_from(tmp, e, next) {
 958		if (--*l < 0)
 959			break;
 960	}
 961	state->node = e;
 962
 963	return (*l < 0) ? state : NULL;
 964}
 965
 966static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 967			  struct lec_priv *priv)
 968{
 969	void *v = NULL;
 970	int p;
 971
 972	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 973		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 974		if (v)
 975			break;
 976	}
 977	state->arp_table = p;
 978	return v;
 979}
 980
 981static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 982			   struct lec_priv *priv)
 983{
 984	struct hlist_head *lec_misc_tables[] = {
 985		&priv->lec_arp_empty_ones,
 986		&priv->lec_no_forward,
 987		&priv->mcast_fwds
 988	};
 989	void *v = NULL;
 990	int q;
 991
 992	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 993		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 994		if (v)
 995			break;
 996	}
 997	state->misc_table = q;
 998	return v;
 999}
1000
1001static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1002			   struct lec_priv *priv)
1003{
1004	if (!state->locked) {
1005		state->locked = priv;
1006		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1007	}
1008	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1009		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1010		state->locked = NULL;
1011		/* Partial state reset for the next time we get called */
1012		state->arp_table = state->misc_table = 0;
1013	}
1014	return state->locked;
1015}
1016
1017static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1018{
1019	struct net_device *dev;
1020	void *v;
1021
1022	dev = state->dev ? state->dev : dev_lec[state->itf];
1023	v = (dev && netdev_priv(dev)) ?
1024		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1025	if (!v && dev) {
1026		dev_put(dev);
1027		/* Partial state reset for the next time we get called */
1028		dev = NULL;
1029	}
1030	state->dev = dev;
1031	return v;
1032}
1033
1034static void *lec_get_idx(struct lec_state *state, loff_t l)
1035{
1036	void *v = NULL;
1037
1038	for (; state->itf < MAX_LEC_ITF; state->itf++) {
1039		v = lec_itf_walk(state, &l);
1040		if (v)
1041			break;
1042	}
1043	return v;
1044}
1045
1046static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1047{
1048	struct lec_state *state = seq->private;
1049
1050	state->itf = 0;
1051	state->dev = NULL;
1052	state->locked = NULL;
1053	state->arp_table = 0;
1054	state->misc_table = 0;
1055	state->node = SEQ_START_TOKEN;
1056
1057	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1058}
1059
1060static void lec_seq_stop(struct seq_file *seq, void *v)
1061{
1062	struct lec_state *state = seq->private;
1063
1064	if (state->dev) {
1065		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1066				       state->flags);
1067		dev_put(state->dev);
1068	}
1069}
1070
1071static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1072{
1073	struct lec_state *state = seq->private;
1074
1075	v = lec_get_idx(state, 1);
1076	*pos += !!PTR_ERR(v);
1077	return v;
1078}
1079
1080static int lec_seq_show(struct seq_file *seq, void *v)
1081{
1082	static const char lec_banner[] =
1083	    "Itf  MAC          ATM destination"
1084	    "                          Status            Flags "
1085	    "VPI/VCI Recv VPI/VCI\n";
1086
1087	if (v == SEQ_START_TOKEN)
1088		seq_puts(seq, lec_banner);
1089	else {
1090		struct lec_state *state = seq->private;
1091		struct net_device *dev = state->dev;
1092		struct lec_arp_table *entry = hlist_entry(state->node,
1093							  struct lec_arp_table,
1094							  next);
1095
1096		seq_printf(seq, "%s ", dev->name);
1097		lec_info(seq, entry);
1098	}
1099	return 0;
1100}
1101
1102static const struct seq_operations lec_seq_ops = {
1103	.start = lec_seq_start,
1104	.next = lec_seq_next,
1105	.stop = lec_seq_stop,
1106	.show = lec_seq_show,
1107};
1108
1109static int lec_seq_open(struct inode *inode, struct file *file)
1110{
1111	return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1112}
1113
1114static const struct file_operations lec_seq_fops = {
1115	.owner = THIS_MODULE,
1116	.open = lec_seq_open,
1117	.read = seq_read,
1118	.llseek = seq_lseek,
1119	.release = seq_release_private,
1120};
1121#endif
1122
1123static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1124{
1125	struct atm_vcc *vcc = ATM_SD(sock);
1126	int err = 0;
1127
1128	switch (cmd) {
1129	case ATMLEC_CTRL:
1130	case ATMLEC_MCAST:
1131	case ATMLEC_DATA:
1132		if (!capable(CAP_NET_ADMIN))
1133			return -EPERM;
1134		break;
1135	default:
1136		return -ENOIOCTLCMD;
1137	}
1138
1139	switch (cmd) {
1140	case ATMLEC_CTRL:
1141		err = lecd_attach(vcc, (int)arg);
1142		if (err >= 0)
1143			sock->state = SS_CONNECTED;
1144		break;
1145	case ATMLEC_MCAST:
1146		err = lec_mcast_attach(vcc, (int)arg);
1147		break;
1148	case ATMLEC_DATA:
1149		err = lec_vcc_attach(vcc, (void __user *)arg);
1150		break;
1151	}
1152
1153	return err;
1154}
1155
1156static struct atm_ioctl lane_ioctl_ops = {
1157	.owner = THIS_MODULE,
1158	.ioctl = lane_ioctl,
1159};
1160
1161static int __init lane_module_init(void)
1162{
1163#ifdef CONFIG_PROC_FS
1164	struct proc_dir_entry *p;
1165
1166	p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1167	if (!p) {
1168		pr_err("Unable to initialize /proc/net/atm/lec\n");
1169		return -ENOMEM;
1170	}
1171#endif
1172
1173	register_atm_ioctl(&lane_ioctl_ops);
1174	pr_info("lec.c: initialized\n");
1175	return 0;
1176}
1177
1178static void __exit lane_module_cleanup(void)
1179{
1180	int i;
1181
1182	remove_proc_entry("lec", atm_proc_root);
1183
1184	deregister_atm_ioctl(&lane_ioctl_ops);
1185
1186	for (i = 0; i < MAX_LEC_ITF; i++) {
1187		if (dev_lec[i] != NULL) {
1188			unregister_netdev(dev_lec[i]);
1189			free_netdev(dev_lec[i]);
1190			dev_lec[i] = NULL;
1191		}
1192	}
1193}
1194
1195module_init(lane_module_init);
1196module_exit(lane_module_cleanup);
1197
1198/*
1199 * LANE2: 3.1.3, LE_RESOLVE.request
1200 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1201 * If sizeoftlvs == NULL the default TLVs associated with with this
1202 * lec will be used.
1203 * If dst_mac == NULL, targetless LE_ARP will be sent
1204 */
1205static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1206			 u8 **tlvs, u32 *sizeoftlvs)
1207{
1208	unsigned long flags;
1209	struct lec_priv *priv = netdev_priv(dev);
1210	struct lec_arp_table *table;
1211	struct sk_buff *skb;
1212	int retval;
1213
1214	if (force == 0) {
1215		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1216		table = lec_arp_find(priv, dst_mac);
1217		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1218		if (table == NULL)
1219			return -1;
1220
1221		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1222		if (*tlvs == NULL)
1223			return -1;
1224
1225		*sizeoftlvs = table->sizeoftlvs;
1226
1227		return 0;
1228	}
1229
1230	if (sizeoftlvs == NULL)
1231		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1232
1233	else {
1234		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1235		if (skb == NULL)
1236			return -1;
1237		skb->len = *sizeoftlvs;
1238		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1239		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1240	}
1241	return retval;
1242}
1243
1244/*
1245 * LANE2: 3.1.4, LE_ASSOCIATE.request
1246 * Associate the *tlvs with the *lan_dst address.
1247 * Will overwrite any previous association
1248 * Returns 1 for success, 0 for failure (out of memory)
1249 *
1250 */
1251static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1252			       const u8 *tlvs, u32 sizeoftlvs)
1253{
1254	int retval;
1255	struct sk_buff *skb;
1256	struct lec_priv *priv = netdev_priv(dev);
1257
1258	if (compare_ether_addr(lan_dst, dev->dev_addr))
1259		return 0;	/* not our mac address */
1260
1261	kfree(priv->tlvs);	/* NULL if there was no previous association */
1262
1263	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1264	if (priv->tlvs == NULL)
1265		return 0;
1266	priv->sizeoftlvs = sizeoftlvs;
1267
1268	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1269	if (skb == NULL)
1270		return 0;
1271	skb->len = sizeoftlvs;
1272	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1273	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1274	if (retval != 0)
1275		pr_info("lec.c: lane2_associate_req() failed\n");
1276	/*
1277	 * If the previous association has changed we must
1278	 * somehow notify other LANE entities about the change
1279	 */
1280	return 1;
1281}
1282
1283/*
1284 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1285 *
1286 */
1287static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1288				const u8 *tlvs, u32 sizeoftlvs)
1289{
1290#if 0
1291	int i = 0;
1292#endif
1293	struct lec_priv *priv = netdev_priv(dev);
1294#if 0				/*
1295				 * Why have the TLVs in LE_ARP entries
1296				 * since we do not use them? When you
1297				 * uncomment this code, make sure the
1298				 * TLVs get freed when entry is killed
1299				 */
1300	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1301
1302	if (entry == NULL)
1303		return;		/* should not happen */
1304
1305	kfree(entry->tlvs);
1306
1307	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1308	if (entry->tlvs == NULL)
1309		return;
1310	entry->sizeoftlvs = sizeoftlvs;
1311#endif
1312#if 0
1313	pr_info("\n");
1314	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1315	while (i < sizeoftlvs)
1316		pr_cont("%02x ", tlvs[i++]);
1317
1318	pr_cont("\n");
1319#endif
1320
1321	/* tell MPOA about the TLVs we saw */
1322	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1323		priv->lane2_ops->associate_indicator(dev, mac_addr,
1324						     tlvs, sizeoftlvs);
1325	}
1326}
1327
1328/*
1329 * Here starts what used to lec_arpc.c
1330 *
1331 * lec_arpc.c was added here when making
1332 * lane client modular. October 1997
1333 */
1334
1335#include <linux/types.h>
1336#include <linux/timer.h>
1337#include <linux/param.h>
1338#include <linux/atomic.h>
1339#include <linux/inetdevice.h>
1340#include <net/route.h>
1341
1342#if 0
1343#define pr_debug(format, args...)
1344/*
1345  #define pr_debug printk
1346*/
1347#endif
1348#define DEBUG_ARP_TABLE 0
1349
1350#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1351
1352static void lec_arp_check_expire(struct work_struct *work);
1353static void lec_arp_expire_arp(unsigned long data);
1354
1355/*
1356 * Arp table funcs
1357 */
1358
1359#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1360
1361/*
1362 * Initialization of arp-cache
1363 */
1364static void lec_arp_init(struct lec_priv *priv)
1365{
1366	unsigned short i;
1367
1368	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1369		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1370	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1371	INIT_HLIST_HEAD(&priv->lec_no_forward);
1372	INIT_HLIST_HEAD(&priv->mcast_fwds);
1373	spin_lock_init(&priv->lec_arp_lock);
1374	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1375	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1376}
1377
1378static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1379{
1380	if (entry->vcc) {
1381		struct atm_vcc *vcc = entry->vcc;
1382		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1383		struct net_device *dev = (struct net_device *)vcc->proto_data;
1384
1385		vcc->pop = vpriv->old_pop;
1386		if (vpriv->xoff)
1387			netif_wake_queue(dev);
1388		kfree(vpriv);
1389		vcc->user_back = NULL;
1390		vcc->push = entry->old_push;
1391		vcc_release_async(vcc, -EPIPE);
1392		entry->vcc = NULL;
1393	}
1394	if (entry->recv_vcc) {
1395		entry->recv_vcc->push = entry->old_recv_push;
1396		vcc_release_async(entry->recv_vcc, -EPIPE);
1397		entry->recv_vcc = NULL;
1398	}
1399}
1400
1401/*
1402 * Insert entry to lec_arp_table
1403 * LANE2: Add to the end of the list to satisfy 8.1.13
1404 */
1405static inline void
1406lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1407{
1408	struct hlist_head *tmp;
1409
1410	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1411	hlist_add_head(&entry->next, tmp);
1412
1413	pr_debug("Added entry:%pM\n", entry->mac_addr);
1414}
1415
1416/*
1417 * Remove entry from lec_arp_table
1418 */
1419static int
1420lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1421{
1422	struct hlist_node *node;
1423	struct lec_arp_table *entry;
1424	int i, remove_vcc = 1;
1425
1426	if (!to_remove)
1427		return -1;
1428
1429	hlist_del(&to_remove->next);
1430	del_timer(&to_remove->timer);
1431
1432	/*
1433	 * If this is the only MAC connected to this VCC,
1434	 * also tear down the VCC
1435	 */
1436	if (to_remove->status >= ESI_FLUSH_PENDING) {
1437		/*
1438		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1439		 */
1440		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1441			hlist_for_each_entry(entry, node,
1442					     &priv->lec_arp_tables[i], next) {
1443				if (memcmp(to_remove->atm_addr,
1444					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1445					remove_vcc = 0;
1446					break;
1447				}
1448			}
1449		}
1450		if (remove_vcc)
1451			lec_arp_clear_vccs(to_remove);
1452	}
1453	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1454
1455	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1456	return 0;
1457}
1458
1459#if DEBUG_ARP_TABLE
1460static const char *get_status_string(unsigned char st)
1461{
1462	switch (st) {
1463	case ESI_UNKNOWN:
1464		return "ESI_UNKNOWN";
1465	case ESI_ARP_PENDING:
1466		return "ESI_ARP_PENDING";
1467	case ESI_VC_PENDING:
1468		return "ESI_VC_PENDING";
1469	case ESI_FLUSH_PENDING:
1470		return "ESI_FLUSH_PENDING";
1471	case ESI_FORWARD_DIRECT:
1472		return "ESI_FORWARD_DIRECT";
1473	}
1474	return "<UNKNOWN>";
1475}
1476
1477static void dump_arp_table(struct lec_priv *priv)
1478{
1479	struct hlist_node *node;
1480	struct lec_arp_table *rulla;
1481	char buf[256];
1482	int i, j, offset;
1483
1484	pr_info("Dump %p:\n", priv);
1485	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1486		hlist_for_each_entry(rulla, node,
1487				     &priv->lec_arp_tables[i], next) {
1488			offset = 0;
1489			offset += sprintf(buf, "%d: %p\n", i, rulla);
1490			offset += sprintf(buf + offset, "Mac: %pM",
1491					  rulla->mac_addr);
1492			offset += sprintf(buf + offset, " Atm:");
1493			for (j = 0; j < ATM_ESA_LEN; j++) {
1494				offset += sprintf(buf + offset,
1495						  "%2.2x ",
1496						  rulla->atm_addr[j] & 0xff);
1497			}
1498			offset += sprintf(buf + offset,
1499					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1500					  rulla->vcc ? rulla->vcc->vpi : 0,
1501					  rulla->vcc ? rulla->vcc->vci : 0,
1502					  rulla->recv_vcc ? rulla->recv_vcc->
1503					  vpi : 0,
1504					  rulla->recv_vcc ? rulla->recv_vcc->
1505					  vci : 0, rulla->last_used,
1506					  rulla->timestamp, rulla->no_tries);
1507			offset +=
1508			    sprintf(buf + offset,
1509				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1510				    rulla->flags, rulla->packets_flooded,
1511				    get_status_string(rulla->status));
1512			pr_info("%s\n", buf);
1513		}
1514	}
1515
1516	if (!hlist_empty(&priv->lec_no_forward))
1517		pr_info("No forward\n");
1518	hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1519		offset = 0;
1520		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1521		offset += sprintf(buf + offset, " Atm:");
1522		for (j = 0; j < ATM_ESA_LEN; j++) {
1523			offset += sprintf(buf + offset, "%2.2x ",
1524					  rulla->atm_addr[j] & 0xff);
1525		}
1526		offset += sprintf(buf + offset,
1527				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1528				  rulla->vcc ? rulla->vcc->vpi : 0,
1529				  rulla->vcc ? rulla->vcc->vci : 0,
1530				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1531				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1532				  rulla->last_used,
1533				  rulla->timestamp, rulla->no_tries);
1534		offset += sprintf(buf + offset,
1535				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1536				  rulla->flags, rulla->packets_flooded,
1537				  get_status_string(rulla->status));
1538		pr_info("%s\n", buf);
1539	}
1540
1541	if (!hlist_empty(&priv->lec_arp_empty_ones))
1542		pr_info("Empty ones\n");
1543	hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1544		offset = 0;
1545		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1546		offset += sprintf(buf + offset, " Atm:");
1547		for (j = 0; j < ATM_ESA_LEN; j++) {
1548			offset += sprintf(buf + offset, "%2.2x ",
1549					  rulla->atm_addr[j] & 0xff);
1550		}
1551		offset += sprintf(buf + offset,
1552				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1553				  rulla->vcc ? rulla->vcc->vpi : 0,
1554				  rulla->vcc ? rulla->vcc->vci : 0,
1555				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1556				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1557				  rulla->last_used,
1558				  rulla->timestamp, rulla->no_tries);
1559		offset += sprintf(buf + offset,
1560				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1561				  rulla->flags, rulla->packets_flooded,
1562				  get_status_string(rulla->status));
1563		pr_info("%s", buf);
1564	}
1565
1566	if (!hlist_empty(&priv->mcast_fwds))
1567		pr_info("Multicast Forward VCCs\n");
1568	hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1569		offset = 0;
1570		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1571		offset += sprintf(buf + offset, " Atm:");
1572		for (j = 0; j < ATM_ESA_LEN; j++) {
1573			offset += sprintf(buf + offset, "%2.2x ",
1574					  rulla->atm_addr[j] & 0xff);
1575		}
1576		offset += sprintf(buf + offset,
1577				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1578				  rulla->vcc ? rulla->vcc->vpi : 0,
1579				  rulla->vcc ? rulla->vcc->vci : 0,
1580				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1581				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1582				  rulla->last_used,
1583				  rulla->timestamp, rulla->no_tries);
1584		offset += sprintf(buf + offset,
1585				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1586				  rulla->flags, rulla->packets_flooded,
1587				  get_status_string(rulla->status));
1588		pr_info("%s\n", buf);
1589	}
1590
1591}
1592#else
1593#define dump_arp_table(priv) do { } while (0)
1594#endif
1595
1596/*
1597 * Destruction of arp-cache
1598 */
1599static void lec_arp_destroy(struct lec_priv *priv)
1600{
1601	unsigned long flags;
1602	struct hlist_node *node, *next;
1603	struct lec_arp_table *entry;
1604	int i;
1605
1606	cancel_delayed_work_sync(&priv->lec_arp_work);
1607
1608	/*
1609	 * Remove all entries
1610	 */
1611
1612	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1613	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1614		hlist_for_each_entry_safe(entry, node, next,
1615					  &priv->lec_arp_tables[i], next) {
1616			lec_arp_remove(priv, entry);
1617			lec_arp_put(entry);
1618		}
1619		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1620	}
1621
1622	hlist_for_each_entry_safe(entry, node, next,
1623				  &priv->lec_arp_empty_ones, next) {
1624		del_timer_sync(&entry->timer);
1625		lec_arp_clear_vccs(entry);
1626		hlist_del(&entry->next);
1627		lec_arp_put(entry);
1628	}
1629	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1630
1631	hlist_for_each_entry_safe(entry, node, next,
1632				  &priv->lec_no_forward, next) {
1633		del_timer_sync(&entry->timer);
1634		lec_arp_clear_vccs(entry);
1635		hlist_del(&entry->next);
1636		lec_arp_put(entry);
1637	}
1638	INIT_HLIST_HEAD(&priv->lec_no_forward);
1639
1640	hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1641		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1642		lec_arp_clear_vccs(entry);
1643		hlist_del(&entry->next);
1644		lec_arp_put(entry);
1645	}
1646	INIT_HLIST_HEAD(&priv->mcast_fwds);
1647	priv->mcast_vcc = NULL;
1648	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1649}
1650
1651/*
1652 * Find entry by mac_address
1653 */
1654static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1655					  const unsigned char *mac_addr)
1656{
1657	struct hlist_node *node;
1658	struct hlist_head *head;
1659	struct lec_arp_table *entry;
1660
1661	pr_debug("%pM\n", mac_addr);
1662
1663	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1664	hlist_for_each_entry(entry, node, head, next) {
1665		if (!compare_ether_addr(mac_addr, entry->mac_addr))
1666			return entry;
1667	}
1668	return NULL;
1669}
1670
1671static struct lec_arp_table *make_entry(struct lec_priv *priv,
1672					const unsigned char *mac_addr)
1673{
1674	struct lec_arp_table *to_return;
1675
1676	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1677	if (!to_return) {
1678		pr_info("LEC: Arp entry kmalloc failed\n");
1679		return NULL;
1680	}
1681	memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1682	INIT_HLIST_NODE(&to_return->next);
1683	setup_timer(&to_return->timer, lec_arp_expire_arp,
1684			(unsigned long)to_return);
1685	to_return->last_used = jiffies;
1686	to_return->priv = priv;
1687	skb_queue_head_init(&to_return->tx_wait);
1688	atomic_set(&to_return->usage, 1);
1689	return to_return;
1690}
1691
1692/* Arp sent timer expired */
1693static void lec_arp_expire_arp(unsigned long data)
1694{
1695	struct lec_arp_table *entry;
1696
1697	entry = (struct lec_arp_table *)data;
1698
1699	pr_debug("\n");
1700	if (entry->status == ESI_ARP_PENDING) {
1701		if (entry->no_tries <= entry->priv->max_retry_count) {
1702			if (entry->is_rdesc)
1703				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1704					     entry->mac_addr, NULL, NULL);
1705			else
1706				send_to_lecd(entry->priv, l_arp_xmt,
1707					     entry->mac_addr, NULL, NULL);
1708			entry->no_tries++;
1709		}
1710		mod_timer(&entry->timer, jiffies + (1 * HZ));
1711	}
1712}
1713
1714/* Unknown/unused vcc expire, remove associated entry */
1715static void lec_arp_expire_vcc(unsigned long data)
1716{
1717	unsigned long flags;
1718	struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1719	struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1720
1721	del_timer(&to_remove->timer);
1722
1723	pr_debug("%p %p: vpi:%d vci:%d\n",
1724		 to_remove, priv,
1725		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1726		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1727
1728	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1729	hlist_del(&to_remove->next);
1730	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1731
1732	lec_arp_clear_vccs(to_remove);
1733	lec_arp_put(to_remove);
1734}
1735
1736static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1737				   unsigned long now,
1738				   struct lec_priv *priv)
1739{
1740	unsigned long time_to_check;
1741
1742	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1743		time_to_check = priv->forward_delay_time;
1744	else
1745		time_to_check = priv->aging_time;
1746
1747	pr_debug("About to expire: %lx - %lx > %lx\n",
1748		 now, entry->last_used, time_to_check);
1749	if (time_after(now, entry->last_used + time_to_check) &&
1750	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1751	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1752		/* Remove entry */
1753		pr_debug("Entry timed out\n");
1754		lec_arp_remove(priv, entry);
1755		lec_arp_put(entry);
1756	} else {
1757		/* Something else */
1758		if ((entry->status == ESI_VC_PENDING ||
1759		     entry->status == ESI_ARP_PENDING) &&
1760		    time_after_eq(now, entry->timestamp +
1761				       priv->max_unknown_frame_time)) {
1762			entry->timestamp = jiffies;
1763			entry->packets_flooded = 0;
1764			if (entry->status == ESI_VC_PENDING)
1765				send_to_lecd(priv, l_svc_setup,
1766					     entry->mac_addr,
1767					     entry->atm_addr,
1768					     NULL);
1769		}
1770		if (entry->status == ESI_FLUSH_PENDING &&
1771		    time_after_eq(now, entry->timestamp +
1772				       priv->path_switching_delay)) {
1773			lec_arp_hold(entry);
1774			return true;
1775		}
1776	}
1777
1778	return false;
1779}
1780/*
1781 * Expire entries.
1782 * 1. Re-set timer
1783 * 2. For each entry, delete entries that have aged past the age limit.
1784 * 3. For each entry, depending on the status of the entry, perform
1785 *    the following maintenance.
1786 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1787 *       tick_count is above the max_unknown_frame_time, clear
1788 *       the tick_count to zero and clear the packets_flooded counter
1789 *       to zero. This supports the packet rate limit per address
1790 *       while flooding unknowns.
1791 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1792 *       than or equal to the path_switching_delay, change the status
1793 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1794 *       regardless of the progress of the flush protocol.
1795 */
1796static void lec_arp_check_expire(struct work_struct *work)
1797{
1798	unsigned long flags;
1799	struct lec_priv *priv =
1800		container_of(work, struct lec_priv, lec_arp_work.work);
1801	struct hlist_node *node, *next;
1802	struct lec_arp_table *entry;
1803	unsigned long now;
1804	int i;
1805
1806	pr_debug("%p\n", priv);
1807	now = jiffies;
1808restart:
1809	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1810	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1811		hlist_for_each_entry_safe(entry, node, next,
1812					  &priv->lec_arp_tables[i], next) {
1813			if (__lec_arp_check_expire(entry, now, priv)) {
1814				struct sk_buff *skb;
1815				struct atm_vcc *vcc = entry->vcc;
1816
1817				spin_unlock_irqrestore(&priv->lec_arp_lock,
1818						       flags);
1819				while ((skb = skb_dequeue(&entry->tx_wait)))
1820					lec_send(vcc, skb);
1821				entry->last_used = jiffies;
1822				entry->status = ESI_FORWARD_DIRECT;
1823				lec_arp_put(entry);
1824
1825				goto restart;
1826			}
1827		}
1828	}
1829	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1830
1831	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1832}
1833
1834/*
1835 * Try to find vcc where mac_address is attached.
1836 *
1837 */
1838static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1839				       const unsigned char *mac_to_find,
1840				       int is_rdesc,
1841				       struct lec_arp_table **ret_entry)
1842{
1843	unsigned long flags;
1844	struct lec_arp_table *entry;
1845	struct atm_vcc *found;
1846
1847	if (mac_to_find[0] & 0x01) {
1848		switch (priv->lane_version) {
1849		case 1:
1850			return priv->mcast_vcc;
1851		case 2:	/* LANE2 wants arp for multicast addresses */
1852			if (!compare_ether_addr(mac_to_find, bus_mac))
1853				return priv->mcast_vcc;
1854			break;
1855		default:
1856			break;
1857		}
1858	}
1859
1860	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1861	entry = lec_arp_find(priv, mac_to_find);
1862
1863	if (entry) {
1864		if (entry->status == ESI_FORWARD_DIRECT) {
1865			/* Connection Ok */
1866			entry->last_used = jiffies;
1867			lec_arp_hold(entry);
1868			*ret_entry = entry;
1869			found = entry->vcc;
1870			goto out;
1871		}
1872		/*
1873		 * If the LE_ARP cache entry is still pending, reset count to 0
1874		 * so another LE_ARP request can be made for this frame.
1875		 */
1876		if (entry->status == ESI_ARP_PENDING)
1877			entry->no_tries = 0;
1878		/*
1879		 * Data direct VC not yet set up, check to see if the unknown
1880		 * frame count is greater than the limit. If the limit has
1881		 * not been reached, allow the caller to send packet to
1882		 * BUS.
1883		 */
1884		if (entry->status != ESI_FLUSH_PENDING &&
1885		    entry->packets_flooded <
1886		    priv->maximum_unknown_frame_count) {
1887			entry->packets_flooded++;
1888			pr_debug("Flooding..\n");
1889			found = priv->mcast_vcc;
1890			goto out;
1891		}
1892		/*
1893		 * We got here because entry->status == ESI_FLUSH_PENDING
1894		 * or BUS flood limit was reached for an entry which is
1895		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1896		 */
1897		lec_arp_hold(entry);
1898		*ret_entry = entry;
1899		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1900			 entry->vcc);
1901		found = NULL;
1902	} else {
1903		/* No matching entry was found */
1904		entry = make_entry(priv, mac_to_find);
1905		pr_debug("Making entry\n");
1906		if (!entry) {
1907			found = priv->mcast_vcc;
1908			goto out;
1909		}
1910		lec_arp_add(priv, entry);
1911		/* We want arp-request(s) to be sent */
1912		entry->packets_flooded = 1;
1913		entry->status = ESI_ARP_PENDING;
1914		entry->no_tries = 1;
1915		entry->last_used = entry->timestamp = jiffies;
1916		entry->is_rdesc = is_rdesc;
1917		if (entry->is_rdesc)
1918			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1919				     NULL);
1920		else
1921			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1922		entry->timer.expires = jiffies + (1 * HZ);
1923		entry->timer.function = lec_arp_expire_arp;
1924		add_timer(&entry->timer);
1925		found = priv->mcast_vcc;
1926	}
1927
1928out:
1929	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1930	return found;
1931}
1932
1933static int
1934lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1935		unsigned long permanent)
1936{
1937	unsigned long flags;
1938	struct hlist_node *node, *next;
1939	struct lec_arp_table *entry;
1940	int i;
1941
1942	pr_debug("\n");
1943	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1944	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1945		hlist_for_each_entry_safe(entry, node, next,
1946					  &priv->lec_arp_tables[i], next) {
1947			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1948			    (permanent ||
1949			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1950				lec_arp_remove(priv, entry);
1951				lec_arp_put(entry);
1952			}
1953			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1954			return 0;
1955		}
1956	}
1957	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1958	return -1;
1959}
1960
1961/*
1962 * Notifies:  Response to arp_request (atm_addr != NULL)
1963 */
1964static void
1965lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1966	       const unsigned char *atm_addr, unsigned long remoteflag,
1967	       unsigned int targetless_le_arp)
1968{
1969	unsigned long flags;
1970	struct hlist_node *node, *next;
1971	struct lec_arp_table *entry, *tmp;
1972	int i;
1973
1974	pr_debug("%smac:%pM\n",
1975		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1976
1977	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1978	entry = lec_arp_find(priv, mac_addr);
1979	if (entry == NULL && targetless_le_arp)
1980		goto out;	/*
1981				 * LANE2: ignore targetless LE_ARPs for which
1982				 * we have no entry in the cache. 7.1.30
1983				 */
1984	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1985		hlist_for_each_entry_safe(entry, node, next,
1986					  &priv->lec_arp_empty_ones, next) {
1987			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1988				hlist_del(&entry->next);
1989				del_timer(&entry->timer);
1990				tmp = lec_arp_find(priv, mac_addr);
1991				if (tmp) {
1992					del_timer(&tmp->timer);
1993					tmp->status = ESI_FORWARD_DIRECT;
1994					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1995					tmp->vcc = entry->vcc;
1996					tmp->old_push = entry->old_push;
1997					tmp->last_used = jiffies;
1998					del_timer(&entry->timer);
1999					lec_arp_put(entry);
2000					entry = tmp;
2001				} else {
2002					entry->status = ESI_FORWARD_DIRECT;
2003					memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
 
2004					entry->last_used = jiffies;
2005					lec_arp_add(priv, entry);
2006				}
2007				if (remoteflag)
2008					entry->flags |= LEC_REMOTE_FLAG;
2009				else
2010					entry->flags &= ~LEC_REMOTE_FLAG;
2011				pr_debug("After update\n");
2012				dump_arp_table(priv);
2013				goto out;
2014			}
2015		}
2016	}
2017
2018	entry = lec_arp_find(priv, mac_addr);
2019	if (!entry) {
2020		entry = make_entry(priv, mac_addr);
2021		if (!entry)
2022			goto out;
2023		entry->status = ESI_UNKNOWN;
2024		lec_arp_add(priv, entry);
2025		/* Temporary, changes before end of function */
2026	}
2027	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2028	del_timer(&entry->timer);
2029	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2030		hlist_for_each_entry(tmp, node,
2031				     &priv->lec_arp_tables[i], next) {
2032			if (entry != tmp &&
2033			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2034				/* Vcc to this host exists */
2035				if (tmp->status > ESI_VC_PENDING) {
2036					/*
2037					 * ESI_FLUSH_PENDING,
2038					 * ESI_FORWARD_DIRECT
2039					 */
2040					entry->vcc = tmp->vcc;
2041					entry->old_push = tmp->old_push;
2042				}
2043				entry->status = tmp->status;
2044				break;
2045			}
2046		}
2047	}
2048	if (remoteflag)
2049		entry->flags |= LEC_REMOTE_FLAG;
2050	else
2051		entry->flags &= ~LEC_REMOTE_FLAG;
2052	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2053		entry->status = ESI_VC_PENDING;
2054		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2055	}
2056	pr_debug("After update2\n");
2057	dump_arp_table(priv);
2058out:
2059	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2060}
2061
2062/*
2063 * Notifies: Vcc setup ready
2064 */
2065static void
2066lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2067	      struct atm_vcc *vcc,
2068	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2069{
2070	unsigned long flags;
2071	struct hlist_node *node;
2072	struct lec_arp_table *entry;
2073	int i, found_entry = 0;
2074
2075	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2076	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2077	if (ioc_data->receive == 2) {
2078		pr_debug("LEC_ARP: Attaching mcast forward\n");
2079#if 0
2080		entry = lec_arp_find(priv, bus_mac);
2081		if (!entry) {
2082			pr_info("LEC_ARP: Multicast entry not found!\n");
2083			goto out;
2084		}
2085		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2086		entry->recv_vcc = vcc;
2087		entry->old_recv_push = old_push;
2088#endif
2089		entry = make_entry(priv, bus_mac);
2090		if (entry == NULL)
2091			goto out;
2092		del_timer(&entry->timer);
2093		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2094		entry->recv_vcc = vcc;
2095		entry->old_recv_push = old_push;
2096		hlist_add_head(&entry->next, &priv->mcast_fwds);
2097		goto out;
2098	} else if (ioc_data->receive == 1) {
2099		/*
2100		 * Vcc which we don't want to make default vcc,
2101		 * attach it anyway.
2102		 */
2103		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",
2104			 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2105			 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2106			 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2107			 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2108			 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2109			 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2110			 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2111			 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2112			 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2113			 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2114		entry = make_entry(priv, bus_mac);
2115		if (entry == NULL)
2116			goto out;
2117		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2118		memset(entry->mac_addr, 0, ETH_ALEN);
2119		entry->recv_vcc = vcc;
2120		entry->old_recv_push = old_push;
2121		entry->status = ESI_UNKNOWN;
2122		entry->timer.expires = jiffies + priv->vcc_timeout_period;
2123		entry->timer.function = lec_arp_expire_vcc;
2124		hlist_add_head(&entry->next, &priv->lec_no_forward);
2125		add_timer(&entry->timer);
2126		dump_arp_table(priv);
2127		goto out;
2128	}
2129	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",
2130		 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2131		 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2132		 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2133		 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2134		 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2135		 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2136		 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2137		 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2138		 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2139		 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2140	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2141		hlist_for_each_entry(entry, node,
2142				     &priv->lec_arp_tables[i], next) {
2143			if (memcmp
2144			    (ioc_data->atm_addr, entry->atm_addr,
2145			     ATM_ESA_LEN) == 0) {
2146				pr_debug("LEC_ARP: Attaching data direct\n");
2147				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2148					 entry->vcc ? entry->vcc->vci : 0,
2149					 entry->recv_vcc ? entry->recv_vcc->
2150					 vci : 0);
2151				found_entry = 1;
2152				del_timer(&entry->timer);
2153				entry->vcc = vcc;
2154				entry->old_push = old_push;
2155				if (entry->status == ESI_VC_PENDING) {
2156					if (priv->maximum_unknown_frame_count
2157					    == 0)
2158						entry->status =
2159						    ESI_FORWARD_DIRECT;
2160					else {
2161						entry->timestamp = jiffies;
2162						entry->status =
2163						    ESI_FLUSH_PENDING;
2164#if 0
2165						send_to_lecd(priv, l_flush_xmt,
2166							     NULL,
2167							     entry->atm_addr,
2168							     NULL);
2169#endif
2170					}
2171				} else {
2172					/*
2173					 * They were forming a connection
2174					 * to us, and we to them. Our
2175					 * ATM address is numerically lower
2176					 * than theirs, so we make connection
2177					 * we formed into default VCC (8.1.11).
2178					 * Connection they made gets torn
2179					 * down. This might confuse some
2180					 * clients. Can be changed if
2181					 * someone reports trouble...
2182					 */
2183					;
2184				}
2185			}
2186		}
2187	}
2188	if (found_entry) {
2189		pr_debug("After vcc was added\n");
2190		dump_arp_table(priv);
2191		goto out;
2192	}
2193	/*
2194	 * Not found, snatch address from first data packet that arrives
2195	 * from this vcc
2196	 */
2197	entry = make_entry(priv, bus_mac);
2198	if (!entry)
2199		goto out;
2200	entry->vcc = vcc;
2201	entry->old_push = old_push;
2202	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2203	memset(entry->mac_addr, 0, ETH_ALEN);
2204	entry->status = ESI_UNKNOWN;
2205	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2206	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2207	entry->timer.function = lec_arp_expire_vcc;
2208	add_timer(&entry->timer);
2209	pr_debug("After vcc was added\n");
2210	dump_arp_table(priv);
2211out:
2212	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2213}
2214
2215static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2216{
2217	unsigned long flags;
2218	struct hlist_node *node;
2219	struct lec_arp_table *entry;
2220	int i;
2221
2222	pr_debug("%lx\n", tran_id);
2223restart:
2224	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2225	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2226		hlist_for_each_entry(entry, node,
2227				     &priv->lec_arp_tables[i], next) {
2228			if (entry->flush_tran_id == tran_id &&
2229			    entry->status == ESI_FLUSH_PENDING) {
2230				struct sk_buff *skb;
2231				struct atm_vcc *vcc = entry->vcc;
2232
2233				lec_arp_hold(entry);
2234				spin_unlock_irqrestore(&priv->lec_arp_lock,
2235						       flags);
2236				while ((skb = skb_dequeue(&entry->tx_wait)))
2237					lec_send(vcc, skb);
2238				entry->last_used = jiffies;
2239				entry->status = ESI_FORWARD_DIRECT;
2240				lec_arp_put(entry);
2241				pr_debug("LEC_ARP: Flushed\n");
2242				goto restart;
2243			}
2244		}
2245	}
2246	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2247	dump_arp_table(priv);
2248}
2249
2250static void
2251lec_set_flush_tran_id(struct lec_priv *priv,
2252		      const unsigned char *atm_addr, unsigned long tran_id)
2253{
2254	unsigned long flags;
2255	struct hlist_node *node;
2256	struct lec_arp_table *entry;
2257	int i;
2258
2259	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2260	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2261		hlist_for_each_entry(entry, node,
2262				     &priv->lec_arp_tables[i], next) {
2263			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2264				entry->flush_tran_id = tran_id;
2265				pr_debug("Set flush transaction id to %lx for %p\n",
2266					 tran_id, entry);
2267			}
2268		}
2269	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270}
2271
2272static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2273{
2274	unsigned long flags;
2275	unsigned char mac_addr[] = {
2276		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2277	};
2278	struct lec_arp_table *to_add;
2279	struct lec_vcc_priv *vpriv;
2280	int err = 0;
2281
2282	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2283	if (!vpriv)
2284		return -ENOMEM;
2285	vpriv->xoff = 0;
2286	vpriv->old_pop = vcc->pop;
2287	vcc->user_back = vpriv;
2288	vcc->pop = lec_pop;
2289	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2290	to_add = make_entry(priv, mac_addr);
2291	if (!to_add) {
2292		vcc->pop = vpriv->old_pop;
2293		kfree(vpriv);
2294		err = -ENOMEM;
2295		goto out;
2296	}
2297	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2298	to_add->status = ESI_FORWARD_DIRECT;
2299	to_add->flags |= LEC_PERMANENT_FLAG;
2300	to_add->vcc = vcc;
2301	to_add->old_push = vcc->push;
2302	vcc->push = lec_push;
2303	priv->mcast_vcc = vcc;
2304	lec_arp_add(priv, to_add);
2305out:
2306	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2307	return err;
2308}
2309
2310static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2311{
2312	unsigned long flags;
2313	struct hlist_node *node, *next;
2314	struct lec_arp_table *entry;
2315	int i;
2316
2317	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2318	dump_arp_table(priv);
2319
2320	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2321
2322	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2323		hlist_for_each_entry_safe(entry, node, next,
2324					  &priv->lec_arp_tables[i], next) {
2325			if (vcc == entry->vcc) {
2326				lec_arp_remove(priv, entry);
2327				lec_arp_put(entry);
2328				if (priv->mcast_vcc == vcc)
2329					priv->mcast_vcc = NULL;
2330			}
2331		}
2332	}
2333
2334	hlist_for_each_entry_safe(entry, node, next,
2335				  &priv->lec_arp_empty_ones, next) {
2336		if (entry->vcc == vcc) {
2337			lec_arp_clear_vccs(entry);
2338			del_timer(&entry->timer);
2339			hlist_del(&entry->next);
2340			lec_arp_put(entry);
2341		}
2342	}
2343
2344	hlist_for_each_entry_safe(entry, node, next,
2345				  &priv->lec_no_forward, next) {
2346		if (entry->recv_vcc == vcc) {
2347			lec_arp_clear_vccs(entry);
2348			del_timer(&entry->timer);
2349			hlist_del(&entry->next);
2350			lec_arp_put(entry);
2351		}
2352	}
2353
2354	hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2355		if (entry->recv_vcc == vcc) {
2356			lec_arp_clear_vccs(entry);
2357			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2358			hlist_del(&entry->next);
2359			lec_arp_put(entry);
2360		}
2361	}
2362
2363	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2364	dump_arp_table(priv);
2365}
2366
2367static void
2368lec_arp_check_empties(struct lec_priv *priv,
2369		      struct atm_vcc *vcc, struct sk_buff *skb)
2370{
2371	unsigned long flags;
2372	struct hlist_node *node, *next;
2373	struct lec_arp_table *entry, *tmp;
2374	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2375	unsigned char *src;
2376#ifdef CONFIG_TR
2377	struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2378
2379	if (priv->is_trdev)
2380		src = tr_hdr->h_source;
2381	else
2382#endif
2383		src = hdr->h_source;
2384
2385	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2386	hlist_for_each_entry_safe(entry, node, next,
2387				  &priv->lec_arp_empty_ones, next) {
2388		if (vcc == entry->vcc) {
2389			del_timer(&entry->timer);
2390			memcpy(entry->mac_addr, src, ETH_ALEN);
2391			entry->status = ESI_FORWARD_DIRECT;
2392			entry->last_used = jiffies;
2393			/* We might have got an entry */
2394			tmp = lec_arp_find(priv, src);
2395			if (tmp) {
2396				lec_arp_remove(priv, tmp);
2397				lec_arp_put(tmp);
2398			}
2399			hlist_del(&entry->next);
2400			lec_arp_add(priv, entry);
2401			goto out;
2402		}
2403	}
2404	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2405out:
2406	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2407}
2408
2409MODULE_LICENSE("GPL");