1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * lec.c: Lan Emulation driver
   4 *
   5 * Marko Kiiskila <mkiiskila@yahoo.com>
   6 */
   7
   8#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   9
  10#include <linux/slab.h>
  11#include <linux/kernel.h>
  12#include <linux/bitops.h>
  13#include <linux/capability.h>
  14
  15/* We are ethernet device */
  16#include <linux/if_ether.h>
  17#include <linux/netdevice.h>
  18#include <linux/etherdevice.h>
  19#include <net/sock.h>
  20#include <linux/skbuff.h>
  21#include <linux/ip.h>
  22#include <asm/byteorder.h>
  23#include <linux/uaccess.h>
  24#include <net/arp.h>
  25#include <net/dst.h>
  26#include <linux/proc_fs.h>
  27#include <linux/spinlock.h>
  28#include <linux/seq_file.h>
  29
  30/* And atm device */
  31#include <linux/atmdev.h>
  32#include <linux/atmlec.h>
  33
  34/* Proxy LEC knows about bridging */
  35#if IS_ENABLED(CONFIG_BRIDGE)
  36#include "../bridge/br_private.h"
  37
  38static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  39#endif
  40
  41/* Modular too */
  42#include <linux/module.h>
  43#include <linux/init.h>
  44
  45/* Hardening for Spectre-v1 */
  46#include <linux/nospec.h>
  47
  48#include "lec.h"
  49#include "lec_arpc.h"
  50#include "resources.h"
  51
  52#define DUMP_PACKETS 0		/*
  53				 * 0 = None,
  54				 * 1 = 30 first bytes
  55				 * 2 = Whole packet
  56				 */
  57
  58#define LEC_UNRES_QUE_LEN 8	/*
  59				 * number of tx packets to queue for a
  60				 * single destination while waiting for SVC
  61				 */
  62
  63static int lec_open(struct net_device *dev);
  64static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  65				  struct net_device *dev);
  66static int lec_close(struct net_device *dev);
  67static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  68					  const unsigned char *mac_addr);
  69static int lec_arp_remove(struct lec_priv *priv,
  70			  struct lec_arp_table *to_remove);
  71/* LANE2 functions */
  72static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  73				const u8 *tlvs, u32 sizeoftlvs);
  74static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  75			 u8 **tlvs, u32 *sizeoftlvs);
  76static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  77			       const u8 *tlvs, u32 sizeoftlvs);
  78
  79static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  80			   unsigned long permanent);
  81static void lec_arp_check_empties(struct lec_priv *priv,
  82				  struct atm_vcc *vcc, struct sk_buff *skb);
  83static void lec_arp_destroy(struct lec_priv *priv);
  84static void lec_arp_init(struct lec_priv *priv);
  85static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  86				       const unsigned char *mac_to_find,
  87				       int is_rdesc,
  88				       struct lec_arp_table **ret_entry);
  89static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  90			   const unsigned char *atm_addr,
  91			   unsigned long remoteflag,
  92			   unsigned int targetless_le_arp);
  93static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  94static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  95static void lec_set_flush_tran_id(struct lec_priv *priv,
  96				  const unsigned char *atm_addr,
  97				  unsigned long tran_id);
  98static void lec_vcc_added(struct lec_priv *priv,
  99			  const struct atmlec_ioc *ioc_data,
 100			  struct atm_vcc *vcc,
 101			  void (*old_push)(struct atm_vcc *vcc,
 102					   struct sk_buff *skb));
 103static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 104
 105/* must be done under lec_arp_lock */
 106static inline void lec_arp_hold(struct lec_arp_table *entry)
 107{
 108	refcount_inc(&entry->usage);
 109}
 110
 111static inline void lec_arp_put(struct lec_arp_table *entry)
 112{
 113	if (refcount_dec_and_test(&entry->usage))
 114		kfree(entry);
 115}
 116
 117static struct lane2_ops lane2_ops = {
 118	.resolve = lane2_resolve,		/* spec 3.1.3 */
 119	.associate_req = lane2_associate_req,	/* spec 3.1.4 */
 120	.associate_indicator = NULL             /* spec 3.1.5 */
 121};
 122
 123static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 124
 125/* Device structures */
 126static struct net_device *dev_lec[MAX_LEC_ITF];
 127
 128#if IS_ENABLED(CONFIG_BRIDGE)
 129static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 130{
 131	char *buff;
 132	struct lec_priv *priv;
 133
 134	/*
 135	 * Check if this is a BPDU. If so, ask zeppelin to send
 136	 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 137	 * as the Config BPDU has
 138	 */
 139	buff = skb->data + skb->dev->hard_header_len;
 140	if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 141		struct sock *sk;
 142		struct sk_buff *skb2;
 143		struct atmlec_msg *mesg;
 144
 145		skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 146		if (skb2 == NULL)
 147			return;
 148		skb2->len = sizeof(struct atmlec_msg);
 149		mesg = (struct atmlec_msg *)skb2->data;
 150		mesg->type = l_topology_change;
 151		buff += 4;
 152		mesg->content.normal.flag = *buff & 0x01;
 153					/* 0x01 is topology change */
 154
 155		priv = netdev_priv(dev);
 156		atm_force_charge(priv->lecd, skb2->truesize);
 157		sk = sk_atm(priv->lecd);
 158		skb_queue_tail(&sk->sk_receive_queue, skb2);
 159		sk->sk_data_ready(sk);
 160	}
 161}
 162#endif /* IS_ENABLED(CONFIG_BRIDGE) */
 163
 164/*
 165 * Open/initialize the netdevice. This is called (in the current kernel)
 166 * sometime after booting when the 'ifconfig' program is run.
 167 *
 168 * This routine should set everything up anew at each open, even
 169 * registers that "should" only need to be set once at boot, so that
 170 * there is non-reboot way to recover if something goes wrong.
 171 */
 172
 173static int lec_open(struct net_device *dev)
 174{
 175	netif_start_queue(dev);
 176
 177	return 0;
 178}
 179
 180static void
 181lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 182{
 183	struct net_device *dev = skb->dev;
 184
 185	ATM_SKB(skb)->vcc = vcc;
 186	atm_account_tx(vcc, skb);
 187
 
 188	if (vcc->send(vcc, skb) < 0) {
 189		dev->stats.tx_dropped++;
 190		return;
 191	}
 192
 193	dev->stats.tx_packets++;
 194	dev->stats.tx_bytes += skb->len;
 195}
 196
 197static void lec_tx_timeout(struct net_device *dev)
 198{
 199	pr_info("%s\n", dev->name);
 200	netif_trans_update(dev);
 201	netif_wake_queue(dev);
 202}
 203
 204static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 205				  struct net_device *dev)
 206{
 207	struct sk_buff *skb2;
 208	struct lec_priv *priv = netdev_priv(dev);
 209	struct lecdatahdr_8023 *lec_h;
 210	struct atm_vcc *vcc;
 211	struct lec_arp_table *entry;
 212	unsigned char *dst;
 213	int min_frame_size;
 214	int is_rdesc;
 215
 216	pr_debug("called\n");
 217	if (!priv->lecd) {
 218		pr_info("%s:No lecd attached\n", dev->name);
 219		dev->stats.tx_errors++;
 220		netif_stop_queue(dev);
 221		kfree_skb(skb);
 222		return NETDEV_TX_OK;
 223	}
 224
 225	pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 226		 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 227		 (long)skb_end_pointer(skb));
 228#if IS_ENABLED(CONFIG_BRIDGE)
 229	if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 230		lec_handle_bridge(skb, dev);
 231#endif
 232
 233	/* Make sure we have room for lec_id */
 234	if (skb_headroom(skb) < 2) {
 235		pr_debug("reallocating skb\n");
 236		skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 237		if (unlikely(!skb2)) {
 238			kfree_skb(skb);
 239			return NETDEV_TX_OK;
 240		}
 241		consume_skb(skb);
 242		skb = skb2;
 243	}
 244	skb_push(skb, 2);
 245
 246	/* Put le header to place */
 247	lec_h = (struct lecdatahdr_8023 *)skb->data;
 248	lec_h->le_header = htons(priv->lecid);
 249
 250#if DUMP_PACKETS >= 2
 251#define MAX_DUMP_SKB 99
 252#elif DUMP_PACKETS >= 1
 253#define MAX_DUMP_SKB 30
 254#endif
 255#if DUMP_PACKETS >= 1
 256	printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 257	       dev->name, skb->len, priv->lecid);
 258	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 259		       skb->data, min(skb->len, MAX_DUMP_SKB), true);
 260#endif /* DUMP_PACKETS >= 1 */
 261
 262	/* Minimum ethernet-frame size */
 263	min_frame_size = LEC_MINIMUM_8023_SIZE;
 264	if (skb->len < min_frame_size) {
 265		if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 266			skb2 = skb_copy_expand(skb, 0,
 267					       min_frame_size - skb->truesize,
 268					       GFP_ATOMIC);
 269			dev_kfree_skb(skb);
 270			if (skb2 == NULL) {
 271				dev->stats.tx_dropped++;
 272				return NETDEV_TX_OK;
 273			}
 274			skb = skb2;
 275		}
 276		skb_put(skb, min_frame_size - skb->len);
 277	}
 278
 279	/* Send to right vcc */
 280	is_rdesc = 0;
 281	dst = lec_h->h_dest;
 282	entry = NULL;
 283	vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 284	pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 285		 dev->name, vcc, vcc ? vcc->flags : 0, entry);
 286	if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 287		if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 288			pr_debug("%s:queuing packet, MAC address %pM\n",
 289				 dev->name, lec_h->h_dest);
 290			skb_queue_tail(&entry->tx_wait, skb);
 291		} else {
 292			pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 293				 dev->name, lec_h->h_dest);
 294			dev->stats.tx_dropped++;
 295			dev_kfree_skb(skb);
 296		}
 297		goto out;
 298	}
 299#if DUMP_PACKETS > 0
 300	printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 301	       dev->name, vcc->vpi, vcc->vci);
 302#endif /* DUMP_PACKETS > 0 */
 303
 304	while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 305		pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 306		lec_send(vcc, skb2);
 307	}
 308
 309	lec_send(vcc, skb);
 310
 311	if (!atm_may_send(vcc, 0)) {
 312		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 313
 314		vpriv->xoff = 1;
 315		netif_stop_queue(dev);
 316
 317		/*
 318		 * vcc->pop() might have occurred in between, making
 319		 * the vcc usuable again.  Since xmit is serialized,
 320		 * this is the only situation we have to re-test.
 321		 */
 322
 323		if (atm_may_send(vcc, 0))
 324			netif_wake_queue(dev);
 325	}
 326
 327out:
 328	if (entry)
 329		lec_arp_put(entry);
 330	netif_trans_update(dev);
 331	return NETDEV_TX_OK;
 332}
 333
 334/* The inverse routine to net_open(). */
 335static int lec_close(struct net_device *dev)
 336{
 337	netif_stop_queue(dev);
 338	return 0;
 339}
 340
 341static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 342{
 343	unsigned long flags;
 344	struct net_device *dev = (struct net_device *)vcc->proto_data;
 345	struct lec_priv *priv = netdev_priv(dev);
 346	struct atmlec_msg *mesg;
 347	struct lec_arp_table *entry;
 348	int i;
 349	char *tmp;		/* FIXME */
 350
 351	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 352	mesg = (struct atmlec_msg *)skb->data;
 353	tmp = skb->data;
 354	tmp += sizeof(struct atmlec_msg);
 355	pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 356	switch (mesg->type) {
 357	case l_set_mac_addr:
 358		for (i = 0; i < 6; i++)
 359			dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 360		break;
 361	case l_del_mac_addr:
 362		for (i = 0; i < 6; i++)
 363			dev->dev_addr[i] = 0;
 364		break;
 365	case l_addr_delete:
 366		lec_addr_delete(priv, mesg->content.normal.atm_addr,
 367				mesg->content.normal.flag);
 368		break;
 369	case l_topology_change:
 370		priv->topology_change = mesg->content.normal.flag;
 371		break;
 372	case l_flush_complete:
 373		lec_flush_complete(priv, mesg->content.normal.flag);
 374		break;
 375	case l_narp_req:	/* LANE2: see 7.1.35 in the lane2 spec */
 376		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 377		entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 378		lec_arp_remove(priv, entry);
 379		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 380
 381		if (mesg->content.normal.no_source_le_narp)
 382			break;
 383		/* FALL THROUGH */
 384	case l_arp_update:
 385		lec_arp_update(priv, mesg->content.normal.mac_addr,
 386			       mesg->content.normal.atm_addr,
 387			       mesg->content.normal.flag,
 388			       mesg->content.normal.targetless_le_arp);
 389		pr_debug("in l_arp_update\n");
 390		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
 391			pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 392				 mesg->sizeoftlvs);
 393			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 394					    tmp, mesg->sizeoftlvs);
 395		}
 396		break;
 397	case l_config:
 398		priv->maximum_unknown_frame_count =
 399		    mesg->content.config.maximum_unknown_frame_count;
 400		priv->max_unknown_frame_time =
 401		    (mesg->content.config.max_unknown_frame_time * HZ);
 402		priv->max_retry_count = mesg->content.config.max_retry_count;
 403		priv->aging_time = (mesg->content.config.aging_time * HZ);
 404		priv->forward_delay_time =
 405		    (mesg->content.config.forward_delay_time * HZ);
 406		priv->arp_response_time =
 407		    (mesg->content.config.arp_response_time * HZ);
 408		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 409		priv->path_switching_delay =
 410		    (mesg->content.config.path_switching_delay * HZ);
 411		priv->lane_version = mesg->content.config.lane_version;
 412					/* LANE2 */
 413		priv->lane2_ops = NULL;
 414		if (priv->lane_version > 1)
 415			priv->lane2_ops = &lane2_ops;
 416		rtnl_lock();
 417		if (dev_set_mtu(dev, mesg->content.config.mtu))
 418			pr_info("%s: change_mtu to %d failed\n",
 419				dev->name, mesg->content.config.mtu);
 420		rtnl_unlock();
 421		priv->is_proxy = mesg->content.config.is_proxy;
 422		break;
 423	case l_flush_tran_id:
 424		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 425				      mesg->content.normal.flag);
 426		break;
 427	case l_set_lecid:
 428		priv->lecid =
 429		    (unsigned short)(0xffff & mesg->content.normal.flag);
 430		break;
 431	case l_should_bridge:
 432#if IS_ENABLED(CONFIG_BRIDGE)
 433	{
 434		pr_debug("%s: bridge zeppelin asks about %pM\n",
 435			 dev->name, mesg->content.proxy.mac_addr);
 436
 437		if (br_fdb_test_addr_hook == NULL)
 438			break;
 439
 440		if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 441			/* hit from bridge table, send LE_ARP_RESPONSE */
 442			struct sk_buff *skb2;
 443			struct sock *sk;
 444
 445			pr_debug("%s: entry found, responding to zeppelin\n",
 446				 dev->name);
 447			skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 448			if (skb2 == NULL)
 449				break;
 450			skb2->len = sizeof(struct atmlec_msg);
 451			skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 452			atm_force_charge(priv->lecd, skb2->truesize);
 453			sk = sk_atm(priv->lecd);
 454			skb_queue_tail(&sk->sk_receive_queue, skb2);
 455			sk->sk_data_ready(sk);
 456		}
 457	}
 458#endif /* IS_ENABLED(CONFIG_BRIDGE) */
 459		break;
 460	default:
 461		pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 462		dev_kfree_skb(skb);
 463		return -EINVAL;
 464	}
 465	dev_kfree_skb(skb);
 466	return 0;
 467}
 468
 469static void lec_atm_close(struct atm_vcc *vcc)
 470{
 471	struct sk_buff *skb;
 472	struct net_device *dev = (struct net_device *)vcc->proto_data;
 473	struct lec_priv *priv = netdev_priv(dev);
 474
 475	priv->lecd = NULL;
 476	/* Do something needful? */
 477
 478	netif_stop_queue(dev);
 479	lec_arp_destroy(priv);
 480
 481	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 482		pr_info("%s closing with messages pending\n", dev->name);
 483	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 484		atm_return(vcc, skb->truesize);
 485		dev_kfree_skb(skb);
 486	}
 487
 488	pr_info("%s: Shut down!\n", dev->name);
 489	module_put(THIS_MODULE);
 490}
 491
 492static const struct atmdev_ops lecdev_ops = {
 493	.close = lec_atm_close,
 494	.send = lec_atm_send
 495};
 496
 497static struct atm_dev lecatm_dev = {
 498	.ops = &lecdev_ops,
 499	.type = "lec",
 500	.number = 999,		/* dummy device number */
 501	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 502};
 503
 504/*
 505 * LANE2: new argument struct sk_buff *data contains
 506 * the LE_ARP based TLVs introduced in the LANE2 spec
 507 */
 508static int
 509send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 510	     const unsigned char *mac_addr, const unsigned char *atm_addr,
 511	     struct sk_buff *data)
 512{
 513	struct sock *sk;
 514	struct sk_buff *skb;
 515	struct atmlec_msg *mesg;
 516
 517	if (!priv || !priv->lecd)
 518		return -1;
 519	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 520	if (!skb)
 521		return -1;
 522	skb->len = sizeof(struct atmlec_msg);
 523	mesg = (struct atmlec_msg *)skb->data;
 524	memset(mesg, 0, sizeof(struct atmlec_msg));
 525	mesg->type = type;
 526	if (data != NULL)
 527		mesg->sizeoftlvs = data->len;
 528	if (mac_addr)
 529		ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
 530	else
 531		mesg->content.normal.targetless_le_arp = 1;
 532	if (atm_addr)
 533		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 534
 535	atm_force_charge(priv->lecd, skb->truesize);
 536	sk = sk_atm(priv->lecd);
 537	skb_queue_tail(&sk->sk_receive_queue, skb);
 538	sk->sk_data_ready(sk);
 539
 540	if (data != NULL) {
 541		pr_debug("about to send %d bytes of data\n", data->len);
 542		atm_force_charge(priv->lecd, data->truesize);
 543		skb_queue_tail(&sk->sk_receive_queue, data);
 544		sk->sk_data_ready(sk);
 545	}
 546
 547	return 0;
 548}
 549
 
 
 
 
 
 
 
 
 
 550static void lec_set_multicast_list(struct net_device *dev)
 551{
 552	/*
 553	 * by default, all multicast frames arrive over the bus.
 554	 * eventually support selective multicast service
 555	 */
 556}
 557
 558static const struct net_device_ops lec_netdev_ops = {
 559	.ndo_open		= lec_open,
 560	.ndo_stop		= lec_close,
 561	.ndo_start_xmit		= lec_start_xmit,
 
 562	.ndo_tx_timeout		= lec_tx_timeout,
 563	.ndo_set_rx_mode	= lec_set_multicast_list,
 564};
 565
 566static const unsigned char lec_ctrl_magic[] = {
 567	0xff,
 568	0x00,
 569	0x01,
 570	0x01
 571};
 572
 573#define LEC_DATA_DIRECT_8023  2
 574#define LEC_DATA_DIRECT_8025  3
 575
 576static int lec_is_data_direct(struct atm_vcc *vcc)
 577{
 578	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 579		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 580}
 581
 582static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 583{
 584	unsigned long flags;
 585	struct net_device *dev = (struct net_device *)vcc->proto_data;
 586	struct lec_priv *priv = netdev_priv(dev);
 587
 588#if DUMP_PACKETS > 0
 589	printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 590	       dev->name, vcc->vpi, vcc->vci);
 591#endif
 592	if (!skb) {
 593		pr_debug("%s: null skb\n", dev->name);
 594		lec_vcc_close(priv, vcc);
 595		return;
 596	}
 597#if DUMP_PACKETS >= 2
 598#define MAX_SKB_DUMP 99
 599#elif DUMP_PACKETS >= 1
 600#define MAX_SKB_DUMP 30
 601#endif
 602#if DUMP_PACKETS > 0
 603	printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 604	       dev->name, skb->len, priv->lecid);
 605	print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 606		       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 607#endif /* DUMP_PACKETS > 0 */
 608	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 609				/* Control frame, to daemon */
 610		struct sock *sk = sk_atm(vcc);
 611
 612		pr_debug("%s: To daemon\n", dev->name);
 613		skb_queue_tail(&sk->sk_receive_queue, skb);
 614		sk->sk_data_ready(sk);
 615	} else {		/* Data frame, queue to protocol handlers */
 616		struct lec_arp_table *entry;
 617		unsigned char *src, *dst;
 618
 619		atm_return(vcc, skb->truesize);
 620		if (*(__be16 *) skb->data == htons(priv->lecid) ||
 621		    !priv->lecd || !(dev->flags & IFF_UP)) {
 622			/*
 623			 * Probably looping back, or if lecd is missing,
 624			 * lecd has gone down
 625			 */
 626			pr_debug("Ignoring frame...\n");
 627			dev_kfree_skb(skb);
 628			return;
 629		}
 630		dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 631
 632		/*
 633		 * If this is a Data Direct VCC, and the VCC does not match
 634		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 635		 */
 636		spin_lock_irqsave(&priv->lec_arp_lock, flags);
 637		if (lec_is_data_direct(vcc)) {
 638			src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
 639			entry = lec_arp_find(priv, src);
 640			if (entry && entry->vcc != vcc) {
 641				lec_arp_remove(priv, entry);
 642				lec_arp_put(entry);
 643			}
 644		}
 645		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 646
 647		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
 648		    !priv->is_proxy &&	/* Proxy wants all the packets */
 649		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 650			dev_kfree_skb(skb);
 651			return;
 652		}
 653		if (!hlist_empty(&priv->lec_arp_empty_ones))
 654			lec_arp_check_empties(priv, vcc, skb);
 655		skb_pull(skb, 2);	/* skip lec_id */
 656		skb->protocol = eth_type_trans(skb, dev);
 657		dev->stats.rx_packets++;
 658		dev->stats.rx_bytes += skb->len;
 659		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 660		netif_rx(skb);
 661	}
 662}
 663
 664static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 665{
 666	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 667	struct net_device *dev = skb->dev;
 668
 669	if (vpriv == NULL) {
 670		pr_info("vpriv = NULL!?!?!?\n");
 671		return;
 672	}
 673
 674	vpriv->old_pop(vcc, skb);
 675
 676	if (vpriv->xoff && atm_may_send(vcc, 0)) {
 677		vpriv->xoff = 0;
 678		if (netif_running(dev) && netif_queue_stopped(dev))
 679			netif_wake_queue(dev);
 680	}
 681}
 682
 683static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 684{
 685	struct lec_vcc_priv *vpriv;
 686	int bytes_left;
 687	struct atmlec_ioc ioc_data;
 688
 689	/* Lecd must be up in this case */
 690	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 691	if (bytes_left != 0)
 692		pr_info("copy from user failed for %d bytes\n", bytes_left);
 693	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 694		return -EINVAL;
 695	ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
 696	if (!dev_lec[ioc_data.dev_num])
 697		return -EINVAL;
 698	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 699	if (!vpriv)
 700		return -ENOMEM;
 701	vpriv->xoff = 0;
 702	vpriv->old_pop = vcc->pop;
 703	vcc->user_back = vpriv;
 704	vcc->pop = lec_pop;
 705	lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 706		      &ioc_data, vcc, vcc->push);
 707	vcc->proto_data = dev_lec[ioc_data.dev_num];
 708	vcc->push = lec_push;
 709	return 0;
 710}
 711
 712static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 713{
 714	if (arg < 0 || arg >= MAX_LEC_ITF)
 715		return -EINVAL;
 716	arg = array_index_nospec(arg, MAX_LEC_ITF);
 717	if (!dev_lec[arg])
 718		return -EINVAL;
 719	vcc->proto_data = dev_lec[arg];
 720	return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
 721}
 722
 723/* Initialize device. */
 724static int lecd_attach(struct atm_vcc *vcc, int arg)
 725{
 726	int i;
 727	struct lec_priv *priv;
 728
 729	if (arg < 0)
 730		arg = 0;
 
 
 731	if (arg >= MAX_LEC_ITF)
 732		return -EINVAL;
 733	i = array_index_nospec(arg, MAX_LEC_ITF);
 734	if (!dev_lec[i]) {
 735		int size;
 736
 737		size = sizeof(struct lec_priv);
 738		dev_lec[i] = alloc_etherdev(size);
 739		if (!dev_lec[i])
 740			return -ENOMEM;
 741		dev_lec[i]->netdev_ops = &lec_netdev_ops;
 742		dev_lec[i]->max_mtu = 18190;
 743		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 744		if (register_netdev(dev_lec[i])) {
 745			free_netdev(dev_lec[i]);
 746			return -EINVAL;
 747		}
 748
 749		priv = netdev_priv(dev_lec[i]);
 750	} else {
 751		priv = netdev_priv(dev_lec[i]);
 752		if (priv->lecd)
 753			return -EADDRINUSE;
 754	}
 755	lec_arp_init(priv);
 756	priv->itfnum = i;	/* LANE2 addition */
 757	priv->lecd = vcc;
 758	vcc->dev = &lecatm_dev;
 759	vcc_insert_socket(sk_atm(vcc));
 760
 761	vcc->proto_data = dev_lec[i];
 762	set_bit(ATM_VF_META, &vcc->flags);
 763	set_bit(ATM_VF_READY, &vcc->flags);
 764
 765	/* Set default values to these variables */
 766	priv->maximum_unknown_frame_count = 1;
 767	priv->max_unknown_frame_time = (1 * HZ);
 768	priv->vcc_timeout_period = (1200 * HZ);
 769	priv->max_retry_count = 1;
 770	priv->aging_time = (300 * HZ);
 771	priv->forward_delay_time = (15 * HZ);
 772	priv->topology_change = 0;
 773	priv->arp_response_time = (1 * HZ);
 774	priv->flush_timeout = (4 * HZ);
 775	priv->path_switching_delay = (6 * HZ);
 776
 777	if (dev_lec[i]->flags & IFF_UP)
 778		netif_start_queue(dev_lec[i]);
 779	__module_get(THIS_MODULE);
 780	return i;
 781}
 782
 783#ifdef CONFIG_PROC_FS
 784static const char *lec_arp_get_status_string(unsigned char status)
 785{
 786	static const char *const lec_arp_status_string[] = {
 787		"ESI_UNKNOWN       ",
 788		"ESI_ARP_PENDING   ",
 789		"ESI_VC_PENDING    ",
 790		"<Undefined>       ",
 791		"ESI_FLUSH_PENDING ",
 792		"ESI_FORWARD_DIRECT"
 793	};
 794
 795	if (status > ESI_FORWARD_DIRECT)
 796		status = 3;	/* ESI_UNDEFINED */
 797	return lec_arp_status_string[status];
 798}
 799
 800static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 801{
 802	int i;
 803
 804	for (i = 0; i < ETH_ALEN; i++)
 805		seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 806	seq_printf(seq, " ");
 807	for (i = 0; i < ATM_ESA_LEN; i++)
 808		seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 809	seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 810		   entry->flags & 0xffff);
 811	if (entry->vcc)
 812		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 813	else
 814		seq_printf(seq, "        ");
 815	if (entry->recv_vcc) {
 816		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 817			   entry->recv_vcc->vci);
 818	}
 819	seq_putc(seq, '\n');
 820}
 821
 822struct lec_state {
 823	unsigned long flags;
 824	struct lec_priv *locked;
 825	struct hlist_node *node;
 826	struct net_device *dev;
 827	int itf;
 828	int arp_table;
 829	int misc_table;
 830};
 831
 832static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 833			  loff_t *l)
 834{
 835	struct hlist_node *e = state->node;
 
 836
 837	if (!e)
 838		e = tbl->first;
 839	if (e == SEQ_START_TOKEN) {
 840		e = tbl->first;
 841		--*l;
 842	}
 843
 844	for (; e; e = e->next) {
 845		if (--*l < 0)
 846			break;
 847	}
 848	state->node = e;
 849
 850	return (*l < 0) ? state : NULL;
 851}
 852
 853static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 854			  struct lec_priv *priv)
 855{
 856	void *v = NULL;
 857	int p;
 858
 859	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 860		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 861		if (v)
 862			break;
 863	}
 864	state->arp_table = p;
 865	return v;
 866}
 867
 868static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 869			   struct lec_priv *priv)
 870{
 871	struct hlist_head *lec_misc_tables[] = {
 872		&priv->lec_arp_empty_ones,
 873		&priv->lec_no_forward,
 874		&priv->mcast_fwds
 875	};
 876	void *v = NULL;
 877	int q;
 878
 879	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 880		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 881		if (v)
 882			break;
 883	}
 884	state->misc_table = q;
 885	return v;
 886}
 887
 888static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 889			   struct lec_priv *priv)
 890{
 891	if (!state->locked) {
 892		state->locked = priv;
 893		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 894	}
 895	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 896		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 897		state->locked = NULL;
 898		/* Partial state reset for the next time we get called */
 899		state->arp_table = state->misc_table = 0;
 900	}
 901	return state->locked;
 902}
 903
 904static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 905{
 906	struct net_device *dev;
 907	void *v;
 908
 909	dev = state->dev ? state->dev : dev_lec[state->itf];
 910	v = (dev && netdev_priv(dev)) ?
 911		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 912	if (!v && dev) {
 913		dev_put(dev);
 914		/* Partial state reset for the next time we get called */
 915		dev = NULL;
 916	}
 917	state->dev = dev;
 918	return v;
 919}
 920
 921static void *lec_get_idx(struct lec_state *state, loff_t l)
 922{
 923	void *v = NULL;
 924
 925	for (; state->itf < MAX_LEC_ITF; state->itf++) {
 926		v = lec_itf_walk(state, &l);
 927		if (v)
 928			break;
 929	}
 930	return v;
 931}
 932
 933static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 934{
 935	struct lec_state *state = seq->private;
 936
 937	state->itf = 0;
 938	state->dev = NULL;
 939	state->locked = NULL;
 940	state->arp_table = 0;
 941	state->misc_table = 0;
 942	state->node = SEQ_START_TOKEN;
 943
 944	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 945}
 946
 947static void lec_seq_stop(struct seq_file *seq, void *v)
 948{
 949	struct lec_state *state = seq->private;
 950
 951	if (state->dev) {
 952		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 953				       state->flags);
 954		dev_put(state->dev);
 955	}
 956}
 957
 958static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 959{
 960	struct lec_state *state = seq->private;
 961
 962	v = lec_get_idx(state, 1);
 963	*pos += !!PTR_ERR(v);
 964	return v;
 965}
 966
 967static int lec_seq_show(struct seq_file *seq, void *v)
 968{
 969	static const char lec_banner[] =
 970	    "Itf  MAC          ATM destination"
 971	    "                          Status            Flags "
 972	    "VPI/VCI Recv VPI/VCI\n";
 973
 974	if (v == SEQ_START_TOKEN)
 975		seq_puts(seq, lec_banner);
 976	else {
 977		struct lec_state *state = seq->private;
 978		struct net_device *dev = state->dev;
 979		struct lec_arp_table *entry = hlist_entry(state->node,
 980							  struct lec_arp_table,
 981							  next);
 982
 983		seq_printf(seq, "%s ", dev->name);
 984		lec_info(seq, entry);
 985	}
 986	return 0;
 987}
 988
 989static const struct seq_operations lec_seq_ops = {
 990	.start = lec_seq_start,
 991	.next = lec_seq_next,
 992	.stop = lec_seq_stop,
 993	.show = lec_seq_show,
 994};
 
 
 
 
 
 
 
 
 
 
 
 
 
 995#endif
 996
 997static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 998{
 999	struct atm_vcc *vcc = ATM_SD(sock);
1000	int err = 0;
1001
1002	switch (cmd) {
1003	case ATMLEC_CTRL:
1004	case ATMLEC_MCAST:
1005	case ATMLEC_DATA:
1006		if (!capable(CAP_NET_ADMIN))
1007			return -EPERM;
1008		break;
1009	default:
1010		return -ENOIOCTLCMD;
1011	}
1012
1013	switch (cmd) {
1014	case ATMLEC_CTRL:
1015		err = lecd_attach(vcc, (int)arg);
1016		if (err >= 0)
1017			sock->state = SS_CONNECTED;
1018		break;
1019	case ATMLEC_MCAST:
1020		err = lec_mcast_attach(vcc, (int)arg);
1021		break;
1022	case ATMLEC_DATA:
1023		err = lec_vcc_attach(vcc, (void __user *)arg);
1024		break;
1025	}
1026
1027	return err;
1028}
1029
1030static struct atm_ioctl lane_ioctl_ops = {
1031	.owner = THIS_MODULE,
1032	.ioctl = lane_ioctl,
1033};
1034
1035static int __init lane_module_init(void)
1036{
1037#ifdef CONFIG_PROC_FS
1038	struct proc_dir_entry *p;
1039
1040	p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1041			sizeof(struct lec_state), NULL);
1042	if (!p) {
1043		pr_err("Unable to initialize /proc/net/atm/lec\n");
1044		return -ENOMEM;
1045	}
1046#endif
1047
1048	register_atm_ioctl(&lane_ioctl_ops);
1049	pr_info("lec.c: initialized\n");
1050	return 0;
1051}
1052
1053static void __exit lane_module_cleanup(void)
1054{
1055	int i;
1056
1057#ifdef CONFIG_PROC_FS
1058	remove_proc_entry("lec", atm_proc_root);
1059#endif
1060
1061	deregister_atm_ioctl(&lane_ioctl_ops);
1062
1063	for (i = 0; i < MAX_LEC_ITF; i++) {
1064		if (dev_lec[i] != NULL) {
1065			unregister_netdev(dev_lec[i]);
1066			free_netdev(dev_lec[i]);
1067			dev_lec[i] = NULL;
1068		}
1069	}
1070}
1071
1072module_init(lane_module_init);
1073module_exit(lane_module_cleanup);
1074
1075/*
1076 * LANE2: 3.1.3, LE_RESOLVE.request
1077 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1078 * If sizeoftlvs == NULL the default TLVs associated with with this
1079 * lec will be used.
1080 * If dst_mac == NULL, targetless LE_ARP will be sent
1081 */
1082static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1083			 u8 **tlvs, u32 *sizeoftlvs)
1084{
1085	unsigned long flags;
1086	struct lec_priv *priv = netdev_priv(dev);
1087	struct lec_arp_table *table;
1088	struct sk_buff *skb;
1089	int retval;
1090
1091	if (force == 0) {
1092		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1093		table = lec_arp_find(priv, dst_mac);
1094		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1095		if (table == NULL)
1096			return -1;
1097
1098		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1099		if (*tlvs == NULL)
1100			return -1;
1101
1102		*sizeoftlvs = table->sizeoftlvs;
1103
1104		return 0;
1105	}
1106
1107	if (sizeoftlvs == NULL)
1108		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1109
1110	else {
1111		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1112		if (skb == NULL)
1113			return -1;
1114		skb->len = *sizeoftlvs;
1115		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1116		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1117	}
1118	return retval;
1119}
1120
1121/*
1122 * LANE2: 3.1.4, LE_ASSOCIATE.request
1123 * Associate the *tlvs with the *lan_dst address.
1124 * Will overwrite any previous association
1125 * Returns 1 for success, 0 for failure (out of memory)
1126 *
1127 */
1128static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1129			       const u8 *tlvs, u32 sizeoftlvs)
1130{
1131	int retval;
1132	struct sk_buff *skb;
1133	struct lec_priv *priv = netdev_priv(dev);
1134
1135	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1136		return 0;	/* not our mac address */
1137
1138	kfree(priv->tlvs);	/* NULL if there was no previous association */
1139
1140	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1141	if (priv->tlvs == NULL)
1142		return 0;
1143	priv->sizeoftlvs = sizeoftlvs;
1144
1145	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1146	if (skb == NULL)
1147		return 0;
1148	skb->len = sizeoftlvs;
1149	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1150	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1151	if (retval != 0)
1152		pr_info("lec.c: lane2_associate_req() failed\n");
1153	/*
1154	 * If the previous association has changed we must
1155	 * somehow notify other LANE entities about the change
1156	 */
1157	return 1;
1158}
1159
1160/*
1161 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1162 *
1163 */
1164static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1165				const u8 *tlvs, u32 sizeoftlvs)
1166{
1167#if 0
1168	int i = 0;
1169#endif
1170	struct lec_priv *priv = netdev_priv(dev);
1171#if 0				/*
1172				 * Why have the TLVs in LE_ARP entries
1173				 * since we do not use them? When you
1174				 * uncomment this code, make sure the
1175				 * TLVs get freed when entry is killed
1176				 */
1177	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1178
1179	if (entry == NULL)
1180		return;		/* should not happen */
1181
1182	kfree(entry->tlvs);
1183
1184	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1185	if (entry->tlvs == NULL)
1186		return;
1187	entry->sizeoftlvs = sizeoftlvs;
1188#endif
1189#if 0
1190	pr_info("\n");
1191	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1192	while (i < sizeoftlvs)
1193		pr_cont("%02x ", tlvs[i++]);
1194
1195	pr_cont("\n");
1196#endif
1197
1198	/* tell MPOA about the TLVs we saw */
1199	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1200		priv->lane2_ops->associate_indicator(dev, mac_addr,
1201						     tlvs, sizeoftlvs);
1202	}
1203}
1204
1205/*
1206 * Here starts what used to lec_arpc.c
1207 *
1208 * lec_arpc.c was added here when making
1209 * lane client modular. October 1997
1210 */
1211
1212#include <linux/types.h>
1213#include <linux/timer.h>
1214#include <linux/param.h>
1215#include <linux/atomic.h>
1216#include <linux/inetdevice.h>
1217#include <net/route.h>
1218
1219#if 0
1220#define pr_debug(format, args...)
1221/*
1222  #define pr_debug printk
1223*/
1224#endif
1225#define DEBUG_ARP_TABLE 0
1226
1227#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1228
1229static void lec_arp_check_expire(struct work_struct *work);
1230static void lec_arp_expire_arp(struct timer_list *t);
1231
1232/*
1233 * Arp table funcs
1234 */
1235
1236#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1237
1238/*
1239 * Initialization of arp-cache
1240 */
1241static void lec_arp_init(struct lec_priv *priv)
1242{
1243	unsigned short i;
1244
1245	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1246		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1247	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1248	INIT_HLIST_HEAD(&priv->lec_no_forward);
1249	INIT_HLIST_HEAD(&priv->mcast_fwds);
1250	spin_lock_init(&priv->lec_arp_lock);
1251	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1252	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1253}
1254
1255static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1256{
1257	if (entry->vcc) {
1258		struct atm_vcc *vcc = entry->vcc;
1259		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1260		struct net_device *dev = (struct net_device *)vcc->proto_data;
1261
1262		vcc->pop = vpriv->old_pop;
1263		if (vpriv->xoff)
1264			netif_wake_queue(dev);
1265		kfree(vpriv);
1266		vcc->user_back = NULL;
1267		vcc->push = entry->old_push;
1268		vcc_release_async(vcc, -EPIPE);
1269		entry->vcc = NULL;
1270	}
1271	if (entry->recv_vcc) {
1272		entry->recv_vcc->push = entry->old_recv_push;
1273		vcc_release_async(entry->recv_vcc, -EPIPE);
1274		entry->recv_vcc = NULL;
1275	}
1276}
1277
1278/*
1279 * Insert entry to lec_arp_table
1280 * LANE2: Add to the end of the list to satisfy 8.1.13
1281 */
1282static inline void
1283lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1284{
1285	struct hlist_head *tmp;
1286
1287	tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1288	hlist_add_head(&entry->next, tmp);
1289
1290	pr_debug("Added entry:%pM\n", entry->mac_addr);
1291}
1292
1293/*
1294 * Remove entry from lec_arp_table
1295 */
1296static int
1297lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1298{
 
1299	struct lec_arp_table *entry;
1300	int i, remove_vcc = 1;
1301
1302	if (!to_remove)
1303		return -1;
1304
1305	hlist_del(&to_remove->next);
1306	del_timer(&to_remove->timer);
1307
1308	/*
1309	 * If this is the only MAC connected to this VCC,
1310	 * also tear down the VCC
1311	 */
1312	if (to_remove->status >= ESI_FLUSH_PENDING) {
1313		/*
1314		 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1315		 */
1316		for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1317			hlist_for_each_entry(entry,
1318					     &priv->lec_arp_tables[i], next) {
1319				if (memcmp(to_remove->atm_addr,
1320					   entry->atm_addr, ATM_ESA_LEN) == 0) {
1321					remove_vcc = 0;
1322					break;
1323				}
1324			}
1325		}
1326		if (remove_vcc)
1327			lec_arp_clear_vccs(to_remove);
1328	}
1329	skb_queue_purge(&to_remove->tx_wait);	/* FIXME: good place for this? */
1330
1331	pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1332	return 0;
1333}
1334
1335#if DEBUG_ARP_TABLE
1336static const char *get_status_string(unsigned char st)
1337{
1338	switch (st) {
1339	case ESI_UNKNOWN:
1340		return "ESI_UNKNOWN";
1341	case ESI_ARP_PENDING:
1342		return "ESI_ARP_PENDING";
1343	case ESI_VC_PENDING:
1344		return "ESI_VC_PENDING";
1345	case ESI_FLUSH_PENDING:
1346		return "ESI_FLUSH_PENDING";
1347	case ESI_FORWARD_DIRECT:
1348		return "ESI_FORWARD_DIRECT";
1349	}
1350	return "<UNKNOWN>";
1351}
1352
1353static void dump_arp_table(struct lec_priv *priv)
1354{
 
1355	struct lec_arp_table *rulla;
1356	char buf[256];
1357	int i, j, offset;
1358
1359	pr_info("Dump %p:\n", priv);
1360	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1361		hlist_for_each_entry(rulla,
1362				     &priv->lec_arp_tables[i], next) {
1363			offset = 0;
1364			offset += sprintf(buf, "%d: %p\n", i, rulla);
1365			offset += sprintf(buf + offset, "Mac: %pM",
1366					  rulla->mac_addr);
1367			offset += sprintf(buf + offset, " Atm:");
1368			for (j = 0; j < ATM_ESA_LEN; j++) {
1369				offset += sprintf(buf + offset,
1370						  "%2.2x ",
1371						  rulla->atm_addr[j] & 0xff);
1372			}
1373			offset += sprintf(buf + offset,
1374					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1375					  rulla->vcc ? rulla->vcc->vpi : 0,
1376					  rulla->vcc ? rulla->vcc->vci : 0,
1377					  rulla->recv_vcc ? rulla->recv_vcc->
1378					  vpi : 0,
1379					  rulla->recv_vcc ? rulla->recv_vcc->
1380					  vci : 0, rulla->last_used,
1381					  rulla->timestamp, rulla->no_tries);
1382			offset +=
1383			    sprintf(buf + offset,
1384				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1385				    rulla->flags, rulla->packets_flooded,
1386				    get_status_string(rulla->status));
1387			pr_info("%s\n", buf);
1388		}
1389	}
1390
1391	if (!hlist_empty(&priv->lec_no_forward))
1392		pr_info("No forward\n");
1393	hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1394		offset = 0;
1395		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1396		offset += sprintf(buf + offset, " Atm:");
1397		for (j = 0; j < ATM_ESA_LEN; j++) {
1398			offset += sprintf(buf + offset, "%2.2x ",
1399					  rulla->atm_addr[j] & 0xff);
1400		}
1401		offset += sprintf(buf + offset,
1402				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1403				  rulla->vcc ? rulla->vcc->vpi : 0,
1404				  rulla->vcc ? rulla->vcc->vci : 0,
1405				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1406				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1407				  rulla->last_used,
1408				  rulla->timestamp, rulla->no_tries);
1409		offset += sprintf(buf + offset,
1410				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1411				  rulla->flags, rulla->packets_flooded,
1412				  get_status_string(rulla->status));
1413		pr_info("%s\n", buf);
1414	}
1415
1416	if (!hlist_empty(&priv->lec_arp_empty_ones))
1417		pr_info("Empty ones\n");
1418	hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1419		offset = 0;
1420		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1421		offset += sprintf(buf + offset, " Atm:");
1422		for (j = 0; j < ATM_ESA_LEN; j++) {
1423			offset += sprintf(buf + offset, "%2.2x ",
1424					  rulla->atm_addr[j] & 0xff);
1425		}
1426		offset += sprintf(buf + offset,
1427				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1428				  rulla->vcc ? rulla->vcc->vpi : 0,
1429				  rulla->vcc ? rulla->vcc->vci : 0,
1430				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1431				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1432				  rulla->last_used,
1433				  rulla->timestamp, rulla->no_tries);
1434		offset += sprintf(buf + offset,
1435				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1436				  rulla->flags, rulla->packets_flooded,
1437				  get_status_string(rulla->status));
1438		pr_info("%s", buf);
1439	}
1440
1441	if (!hlist_empty(&priv->mcast_fwds))
1442		pr_info("Multicast Forward VCCs\n");
1443	hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1444		offset = 0;
1445		offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1446		offset += sprintf(buf + offset, " Atm:");
1447		for (j = 0; j < ATM_ESA_LEN; j++) {
1448			offset += sprintf(buf + offset, "%2.2x ",
1449					  rulla->atm_addr[j] & 0xff);
1450		}
1451		offset += sprintf(buf + offset,
1452				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1453				  rulla->vcc ? rulla->vcc->vpi : 0,
1454				  rulla->vcc ? rulla->vcc->vci : 0,
1455				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1456				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1457				  rulla->last_used,
1458				  rulla->timestamp, rulla->no_tries);
1459		offset += sprintf(buf + offset,
1460				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1461				  rulla->flags, rulla->packets_flooded,
1462				  get_status_string(rulla->status));
1463		pr_info("%s\n", buf);
1464	}
1465
1466}
1467#else
1468#define dump_arp_table(priv) do { } while (0)
1469#endif
1470
1471/*
1472 * Destruction of arp-cache
1473 */
1474static void lec_arp_destroy(struct lec_priv *priv)
1475{
1476	unsigned long flags;
1477	struct hlist_node *next;
1478	struct lec_arp_table *entry;
1479	int i;
1480
1481	cancel_delayed_work_sync(&priv->lec_arp_work);
1482
1483	/*
1484	 * Remove all entries
1485	 */
1486
1487	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1488	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1489		hlist_for_each_entry_safe(entry, next,
1490					  &priv->lec_arp_tables[i], next) {
1491			lec_arp_remove(priv, entry);
1492			lec_arp_put(entry);
1493		}
1494		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1495	}
1496
1497	hlist_for_each_entry_safe(entry, next,
1498				  &priv->lec_arp_empty_ones, next) {
1499		del_timer_sync(&entry->timer);
1500		lec_arp_clear_vccs(entry);
1501		hlist_del(&entry->next);
1502		lec_arp_put(entry);
1503	}
1504	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1505
1506	hlist_for_each_entry_safe(entry, next,
1507				  &priv->lec_no_forward, next) {
1508		del_timer_sync(&entry->timer);
1509		lec_arp_clear_vccs(entry);
1510		hlist_del(&entry->next);
1511		lec_arp_put(entry);
1512	}
1513	INIT_HLIST_HEAD(&priv->lec_no_forward);
1514
1515	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1516		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1517		lec_arp_clear_vccs(entry);
1518		hlist_del(&entry->next);
1519		lec_arp_put(entry);
1520	}
1521	INIT_HLIST_HEAD(&priv->mcast_fwds);
1522	priv->mcast_vcc = NULL;
1523	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1524}
1525
1526/*
1527 * Find entry by mac_address
1528 */
1529static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1530					  const unsigned char *mac_addr)
1531{
 
1532	struct hlist_head *head;
1533	struct lec_arp_table *entry;
1534
1535	pr_debug("%pM\n", mac_addr);
1536
1537	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1538	hlist_for_each_entry(entry, head, next) {
1539		if (ether_addr_equal(mac_addr, entry->mac_addr))
1540			return entry;
1541	}
1542	return NULL;
1543}
1544
1545static struct lec_arp_table *make_entry(struct lec_priv *priv,
1546					const unsigned char *mac_addr)
1547{
1548	struct lec_arp_table *to_return;
1549
1550	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1551	if (!to_return) {
1552		pr_info("LEC: Arp entry kmalloc failed\n");
1553		return NULL;
1554	}
1555	ether_addr_copy(to_return->mac_addr, mac_addr);
1556	INIT_HLIST_NODE(&to_return->next);
1557	timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
 
1558	to_return->last_used = jiffies;
1559	to_return->priv = priv;
1560	skb_queue_head_init(&to_return->tx_wait);
1561	refcount_set(&to_return->usage, 1);
1562	return to_return;
1563}
1564
1565/* Arp sent timer expired */
1566static void lec_arp_expire_arp(struct timer_list *t)
1567{
1568	struct lec_arp_table *entry;
1569
1570	entry = from_timer(entry, t, timer);
1571
1572	pr_debug("\n");
1573	if (entry->status == ESI_ARP_PENDING) {
1574		if (entry->no_tries <= entry->priv->max_retry_count) {
1575			if (entry->is_rdesc)
1576				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1577					     entry->mac_addr, NULL, NULL);
1578			else
1579				send_to_lecd(entry->priv, l_arp_xmt,
1580					     entry->mac_addr, NULL, NULL);
1581			entry->no_tries++;
1582		}
1583		mod_timer(&entry->timer, jiffies + (1 * HZ));
1584	}
1585}
1586
1587/* Unknown/unused vcc expire, remove associated entry */
1588static void lec_arp_expire_vcc(struct timer_list *t)
1589{
1590	unsigned long flags;
1591	struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1592	struct lec_priv *priv = to_remove->priv;
1593
1594	del_timer(&to_remove->timer);
1595
1596	pr_debug("%p %p: vpi:%d vci:%d\n",
1597		 to_remove, priv,
1598		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1599		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1600
1601	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1602	hlist_del(&to_remove->next);
1603	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1604
1605	lec_arp_clear_vccs(to_remove);
1606	lec_arp_put(to_remove);
1607}
1608
1609static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1610				   unsigned long now,
1611				   struct lec_priv *priv)
1612{
1613	unsigned long time_to_check;
1614
1615	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1616		time_to_check = priv->forward_delay_time;
1617	else
1618		time_to_check = priv->aging_time;
1619
1620	pr_debug("About to expire: %lx - %lx > %lx\n",
1621		 now, entry->last_used, time_to_check);
1622	if (time_after(now, entry->last_used + time_to_check) &&
1623	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1624	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1625		/* Remove entry */
1626		pr_debug("Entry timed out\n");
1627		lec_arp_remove(priv, entry);
1628		lec_arp_put(entry);
1629	} else {
1630		/* Something else */
1631		if ((entry->status == ESI_VC_PENDING ||
1632		     entry->status == ESI_ARP_PENDING) &&
1633		    time_after_eq(now, entry->timestamp +
1634				       priv->max_unknown_frame_time)) {
1635			entry->timestamp = jiffies;
1636			entry->packets_flooded = 0;
1637			if (entry->status == ESI_VC_PENDING)
1638				send_to_lecd(priv, l_svc_setup,
1639					     entry->mac_addr,
1640					     entry->atm_addr,
1641					     NULL);
1642		}
1643		if (entry->status == ESI_FLUSH_PENDING &&
1644		    time_after_eq(now, entry->timestamp +
1645				       priv->path_switching_delay)) {
1646			lec_arp_hold(entry);
1647			return true;
1648		}
1649	}
1650
1651	return false;
1652}
1653/*
1654 * Expire entries.
1655 * 1. Re-set timer
1656 * 2. For each entry, delete entries that have aged past the age limit.
1657 * 3. For each entry, depending on the status of the entry, perform
1658 *    the following maintenance.
1659 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1660 *       tick_count is above the max_unknown_frame_time, clear
1661 *       the tick_count to zero and clear the packets_flooded counter
1662 *       to zero. This supports the packet rate limit per address
1663 *       while flooding unknowns.
1664 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1665 *       than or equal to the path_switching_delay, change the status
1666 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1667 *       regardless of the progress of the flush protocol.
1668 */
1669static void lec_arp_check_expire(struct work_struct *work)
1670{
1671	unsigned long flags;
1672	struct lec_priv *priv =
1673		container_of(work, struct lec_priv, lec_arp_work.work);
1674	struct hlist_node *next;
1675	struct lec_arp_table *entry;
1676	unsigned long now;
1677	int i;
1678
1679	pr_debug("%p\n", priv);
1680	now = jiffies;
1681restart:
1682	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1683	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1684		hlist_for_each_entry_safe(entry, next,
1685					  &priv->lec_arp_tables[i], next) {
1686			if (__lec_arp_check_expire(entry, now, priv)) {
1687				struct sk_buff *skb;
1688				struct atm_vcc *vcc = entry->vcc;
1689
1690				spin_unlock_irqrestore(&priv->lec_arp_lock,
1691						       flags);
1692				while ((skb = skb_dequeue(&entry->tx_wait)))
1693					lec_send(vcc, skb);
1694				entry->last_used = jiffies;
1695				entry->status = ESI_FORWARD_DIRECT;
1696				lec_arp_put(entry);
1697
1698				goto restart;
1699			}
1700		}
1701	}
1702	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1703
1704	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1705}
1706
1707/*
1708 * Try to find vcc where mac_address is attached.
1709 *
1710 */
1711static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1712				       const unsigned char *mac_to_find,
1713				       int is_rdesc,
1714				       struct lec_arp_table **ret_entry)
1715{
1716	unsigned long flags;
1717	struct lec_arp_table *entry;
1718	struct atm_vcc *found;
1719
1720	if (mac_to_find[0] & 0x01) {
1721		switch (priv->lane_version) {
1722		case 1:
1723			return priv->mcast_vcc;
1724		case 2:	/* LANE2 wants arp for multicast addresses */
1725			if (ether_addr_equal(mac_to_find, bus_mac))
1726				return priv->mcast_vcc;
1727			break;
1728		default:
1729			break;
1730		}
1731	}
1732
1733	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1734	entry = lec_arp_find(priv, mac_to_find);
1735
1736	if (entry) {
1737		if (entry->status == ESI_FORWARD_DIRECT) {
1738			/* Connection Ok */
1739			entry->last_used = jiffies;
1740			lec_arp_hold(entry);
1741			*ret_entry = entry;
1742			found = entry->vcc;
1743			goto out;
1744		}
1745		/*
1746		 * If the LE_ARP cache entry is still pending, reset count to 0
1747		 * so another LE_ARP request can be made for this frame.
1748		 */
1749		if (entry->status == ESI_ARP_PENDING)
1750			entry->no_tries = 0;
1751		/*
1752		 * Data direct VC not yet set up, check to see if the unknown
1753		 * frame count is greater than the limit. If the limit has
1754		 * not been reached, allow the caller to send packet to
1755		 * BUS.
1756		 */
1757		if (entry->status != ESI_FLUSH_PENDING &&
1758		    entry->packets_flooded <
1759		    priv->maximum_unknown_frame_count) {
1760			entry->packets_flooded++;
1761			pr_debug("Flooding..\n");
1762			found = priv->mcast_vcc;
1763			goto out;
1764		}
1765		/*
1766		 * We got here because entry->status == ESI_FLUSH_PENDING
1767		 * or BUS flood limit was reached for an entry which is
1768		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1769		 */
1770		lec_arp_hold(entry);
1771		*ret_entry = entry;
1772		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1773			 entry->vcc);
1774		found = NULL;
1775	} else {
1776		/* No matching entry was found */
1777		entry = make_entry(priv, mac_to_find);
1778		pr_debug("Making entry\n");
1779		if (!entry) {
1780			found = priv->mcast_vcc;
1781			goto out;
1782		}
1783		lec_arp_add(priv, entry);
1784		/* We want arp-request(s) to be sent */
1785		entry->packets_flooded = 1;
1786		entry->status = ESI_ARP_PENDING;
1787		entry->no_tries = 1;
1788		entry->last_used = entry->timestamp = jiffies;
1789		entry->is_rdesc = is_rdesc;
1790		if (entry->is_rdesc)
1791			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1792				     NULL);
1793		else
1794			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1795		entry->timer.expires = jiffies + (1 * HZ);
1796		entry->timer.function = lec_arp_expire_arp;
1797		add_timer(&entry->timer);
1798		found = priv->mcast_vcc;
1799	}
1800
1801out:
1802	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1803	return found;
1804}
1805
1806static int
1807lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1808		unsigned long permanent)
1809{
1810	unsigned long flags;
1811	struct hlist_node *next;
1812	struct lec_arp_table *entry;
1813	int i;
1814
1815	pr_debug("\n");
1816	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1817	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1818		hlist_for_each_entry_safe(entry, next,
1819					  &priv->lec_arp_tables[i], next) {
1820			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1821			    (permanent ||
1822			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1823				lec_arp_remove(priv, entry);
1824				lec_arp_put(entry);
1825			}
1826			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1827			return 0;
1828		}
1829	}
1830	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1831	return -1;
1832}
1833
1834/*
1835 * Notifies:  Response to arp_request (atm_addr != NULL)
1836 */
1837static void
1838lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1839	       const unsigned char *atm_addr, unsigned long remoteflag,
1840	       unsigned int targetless_le_arp)
1841{
1842	unsigned long flags;
1843	struct hlist_node *next;
1844	struct lec_arp_table *entry, *tmp;
1845	int i;
1846
1847	pr_debug("%smac:%pM\n",
1848		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1849
1850	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1851	entry = lec_arp_find(priv, mac_addr);
1852	if (entry == NULL && targetless_le_arp)
1853		goto out;	/*
1854				 * LANE2: ignore targetless LE_ARPs for which
1855				 * we have no entry in the cache. 7.1.30
1856				 */
1857	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1858		hlist_for_each_entry_safe(entry, next,
1859					  &priv->lec_arp_empty_ones, next) {
1860			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1861				hlist_del(&entry->next);
1862				del_timer(&entry->timer);
1863				tmp = lec_arp_find(priv, mac_addr);
1864				if (tmp) {
1865					del_timer(&tmp->timer);
1866					tmp->status = ESI_FORWARD_DIRECT;
1867					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1868					tmp->vcc = entry->vcc;
1869					tmp->old_push = entry->old_push;
1870					tmp->last_used = jiffies;
1871					del_timer(&entry->timer);
1872					lec_arp_put(entry);
1873					entry = tmp;
1874				} else {
1875					entry->status = ESI_FORWARD_DIRECT;
1876					ether_addr_copy(entry->mac_addr,
1877							mac_addr);
1878					entry->last_used = jiffies;
1879					lec_arp_add(priv, entry);
1880				}
1881				if (remoteflag)
1882					entry->flags |= LEC_REMOTE_FLAG;
1883				else
1884					entry->flags &= ~LEC_REMOTE_FLAG;
1885				pr_debug("After update\n");
1886				dump_arp_table(priv);
1887				goto out;
1888			}
1889		}
1890	}
1891
1892	entry = lec_arp_find(priv, mac_addr);
1893	if (!entry) {
1894		entry = make_entry(priv, mac_addr);
1895		if (!entry)
1896			goto out;
1897		entry->status = ESI_UNKNOWN;
1898		lec_arp_add(priv, entry);
1899		/* Temporary, changes before end of function */
1900	}
1901	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1902	del_timer(&entry->timer);
1903	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1904		hlist_for_each_entry(tmp,
1905				     &priv->lec_arp_tables[i], next) {
1906			if (entry != tmp &&
1907			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1908				/* Vcc to this host exists */
1909				if (tmp->status > ESI_VC_PENDING) {
1910					/*
1911					 * ESI_FLUSH_PENDING,
1912					 * ESI_FORWARD_DIRECT
1913					 */
1914					entry->vcc = tmp->vcc;
1915					entry->old_push = tmp->old_push;
1916				}
1917				entry->status = tmp->status;
1918				break;
1919			}
1920		}
1921	}
1922	if (remoteflag)
1923		entry->flags |= LEC_REMOTE_FLAG;
1924	else
1925		entry->flags &= ~LEC_REMOTE_FLAG;
1926	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1927		entry->status = ESI_VC_PENDING;
1928		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1929	}
1930	pr_debug("After update2\n");
1931	dump_arp_table(priv);
1932out:
1933	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1934}
1935
1936/*
1937 * Notifies: Vcc setup ready
1938 */
1939static void
1940lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1941	      struct atm_vcc *vcc,
1942	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1943{
1944	unsigned long flags;
 
1945	struct lec_arp_table *entry;
1946	int i, found_entry = 0;
1947
1948	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1949	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1950	if (ioc_data->receive == 2) {
1951		pr_debug("LEC_ARP: Attaching mcast forward\n");
1952#if 0
1953		entry = lec_arp_find(priv, bus_mac);
1954		if (!entry) {
1955			pr_info("LEC_ARP: Multicast entry not found!\n");
1956			goto out;
1957		}
1958		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1959		entry->recv_vcc = vcc;
1960		entry->old_recv_push = old_push;
1961#endif
1962		entry = make_entry(priv, bus_mac);
1963		if (entry == NULL)
1964			goto out;
1965		del_timer(&entry->timer);
1966		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1967		entry->recv_vcc = vcc;
1968		entry->old_recv_push = old_push;
1969		hlist_add_head(&entry->next, &priv->mcast_fwds);
1970		goto out;
1971	} else if (ioc_data->receive == 1) {
1972		/*
1973		 * Vcc which we don't want to make default vcc,
1974		 * attach it anyway.
1975		 */
1976		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",
1977			 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1978			 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1979			 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1980			 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1981			 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1982			 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1983			 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1984			 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1985			 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1986			 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1987		entry = make_entry(priv, bus_mac);
1988		if (entry == NULL)
1989			goto out;
1990		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1991		eth_zero_addr(entry->mac_addr);
1992		entry->recv_vcc = vcc;
1993		entry->old_recv_push = old_push;
1994		entry->status = ESI_UNKNOWN;
1995		entry->timer.expires = jiffies + priv->vcc_timeout_period;
1996		entry->timer.function = lec_arp_expire_vcc;
1997		hlist_add_head(&entry->next, &priv->lec_no_forward);
1998		add_timer(&entry->timer);
1999		dump_arp_table(priv);
2000		goto out;
2001	}
2002	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",
2003		 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2004		 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2005		 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2006		 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2007		 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2008		 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2009		 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2010		 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2011		 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2012		 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2013	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2014		hlist_for_each_entry(entry,
2015				     &priv->lec_arp_tables[i], next) {
2016			if (memcmp
2017			    (ioc_data->atm_addr, entry->atm_addr,
2018			     ATM_ESA_LEN) == 0) {
2019				pr_debug("LEC_ARP: Attaching data direct\n");
2020				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2021					 entry->vcc ? entry->vcc->vci : 0,
2022					 entry->recv_vcc ? entry->recv_vcc->
2023					 vci : 0);
2024				found_entry = 1;
2025				del_timer(&entry->timer);
2026				entry->vcc = vcc;
2027				entry->old_push = old_push;
2028				if (entry->status == ESI_VC_PENDING) {
2029					if (priv->maximum_unknown_frame_count
2030					    == 0)
2031						entry->status =
2032						    ESI_FORWARD_DIRECT;
2033					else {
2034						entry->timestamp = jiffies;
2035						entry->status =
2036						    ESI_FLUSH_PENDING;
2037#if 0
2038						send_to_lecd(priv, l_flush_xmt,
2039							     NULL,
2040							     entry->atm_addr,
2041							     NULL);
2042#endif
2043					}
2044				} else {
2045					/*
2046					 * They were forming a connection
2047					 * to us, and we to them. Our
2048					 * ATM address is numerically lower
2049					 * than theirs, so we make connection
2050					 * we formed into default VCC (8.1.11).
2051					 * Connection they made gets torn
2052					 * down. This might confuse some
2053					 * clients. Can be changed if
2054					 * someone reports trouble...
2055					 */
2056					;
2057				}
2058			}
2059		}
2060	}
2061	if (found_entry) {
2062		pr_debug("After vcc was added\n");
2063		dump_arp_table(priv);
2064		goto out;
2065	}
2066	/*
2067	 * Not found, snatch address from first data packet that arrives
2068	 * from this vcc
2069	 */
2070	entry = make_entry(priv, bus_mac);
2071	if (!entry)
2072		goto out;
2073	entry->vcc = vcc;
2074	entry->old_push = old_push;
2075	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2076	eth_zero_addr(entry->mac_addr);
2077	entry->status = ESI_UNKNOWN;
2078	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2079	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2080	entry->timer.function = lec_arp_expire_vcc;
2081	add_timer(&entry->timer);
2082	pr_debug("After vcc was added\n");
2083	dump_arp_table(priv);
2084out:
2085	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2086}
2087
2088static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2089{
2090	unsigned long flags;
 
2091	struct lec_arp_table *entry;
2092	int i;
2093
2094	pr_debug("%lx\n", tran_id);
2095restart:
2096	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2097	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2098		hlist_for_each_entry(entry,
2099				     &priv->lec_arp_tables[i], next) {
2100			if (entry->flush_tran_id == tran_id &&
2101			    entry->status == ESI_FLUSH_PENDING) {
2102				struct sk_buff *skb;
2103				struct atm_vcc *vcc = entry->vcc;
2104
2105				lec_arp_hold(entry);
2106				spin_unlock_irqrestore(&priv->lec_arp_lock,
2107						       flags);
2108				while ((skb = skb_dequeue(&entry->tx_wait)))
2109					lec_send(vcc, skb);
2110				entry->last_used = jiffies;
2111				entry->status = ESI_FORWARD_DIRECT;
2112				lec_arp_put(entry);
2113				pr_debug("LEC_ARP: Flushed\n");
2114				goto restart;
2115			}
2116		}
2117	}
2118	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2119	dump_arp_table(priv);
2120}
2121
2122static void
2123lec_set_flush_tran_id(struct lec_priv *priv,
2124		      const unsigned char *atm_addr, unsigned long tran_id)
2125{
2126	unsigned long flags;
 
2127	struct lec_arp_table *entry;
2128	int i;
2129
2130	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2131	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2132		hlist_for_each_entry(entry,
2133				     &priv->lec_arp_tables[i], next) {
2134			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2135				entry->flush_tran_id = tran_id;
2136				pr_debug("Set flush transaction id to %lx for %p\n",
2137					 tran_id, entry);
2138			}
2139		}
2140	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2141}
2142
2143static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2144{
2145	unsigned long flags;
2146	unsigned char mac_addr[] = {
2147		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2148	};
2149	struct lec_arp_table *to_add;
2150	struct lec_vcc_priv *vpriv;
2151	int err = 0;
2152
2153	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2154	if (!vpriv)
2155		return -ENOMEM;
2156	vpriv->xoff = 0;
2157	vpriv->old_pop = vcc->pop;
2158	vcc->user_back = vpriv;
2159	vcc->pop = lec_pop;
2160	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2161	to_add = make_entry(priv, mac_addr);
2162	if (!to_add) {
2163		vcc->pop = vpriv->old_pop;
2164		kfree(vpriv);
2165		err = -ENOMEM;
2166		goto out;
2167	}
2168	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2169	to_add->status = ESI_FORWARD_DIRECT;
2170	to_add->flags |= LEC_PERMANENT_FLAG;
2171	to_add->vcc = vcc;
2172	to_add->old_push = vcc->push;
2173	vcc->push = lec_push;
2174	priv->mcast_vcc = vcc;
2175	lec_arp_add(priv, to_add);
2176out:
2177	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2178	return err;
2179}
2180
2181static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2182{
2183	unsigned long flags;
2184	struct hlist_node *next;
2185	struct lec_arp_table *entry;
2186	int i;
2187
2188	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2189	dump_arp_table(priv);
2190
2191	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2192
2193	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2194		hlist_for_each_entry_safe(entry, next,
2195					  &priv->lec_arp_tables[i], next) {
2196			if (vcc == entry->vcc) {
2197				lec_arp_remove(priv, entry);
2198				lec_arp_put(entry);
2199				if (priv->mcast_vcc == vcc)
2200					priv->mcast_vcc = NULL;
2201			}
2202		}
2203	}
2204
2205	hlist_for_each_entry_safe(entry, next,
2206				  &priv->lec_arp_empty_ones, next) {
2207		if (entry->vcc == vcc) {
2208			lec_arp_clear_vccs(entry);
2209			del_timer(&entry->timer);
2210			hlist_del(&entry->next);
2211			lec_arp_put(entry);
2212		}
2213	}
2214
2215	hlist_for_each_entry_safe(entry, next,
2216				  &priv->lec_no_forward, next) {
2217		if (entry->recv_vcc == vcc) {
2218			lec_arp_clear_vccs(entry);
2219			del_timer(&entry->timer);
2220			hlist_del(&entry->next);
2221			lec_arp_put(entry);
2222		}
2223	}
2224
2225	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2226		if (entry->recv_vcc == vcc) {
2227			lec_arp_clear_vccs(entry);
2228			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2229			hlist_del(&entry->next);
2230			lec_arp_put(entry);
2231		}
2232	}
2233
2234	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2235	dump_arp_table(priv);
2236}
2237
2238static void
2239lec_arp_check_empties(struct lec_priv *priv,
2240		      struct atm_vcc *vcc, struct sk_buff *skb)
2241{
2242	unsigned long flags;
2243	struct hlist_node *next;
2244	struct lec_arp_table *entry, *tmp;
2245	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2246	unsigned char *src = hdr->h_source;
2247
2248	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2249	hlist_for_each_entry_safe(entry, next,
2250				  &priv->lec_arp_empty_ones, next) {
2251		if (vcc == entry->vcc) {
2252			del_timer(&entry->timer);
2253			ether_addr_copy(entry->mac_addr, src);
2254			entry->status = ESI_FORWARD_DIRECT;
2255			entry->last_used = jiffies;
2256			/* We might have got an entry */
2257			tmp = lec_arp_find(priv, src);
2258			if (tmp) {
2259				lec_arp_remove(priv, tmp);
2260				lec_arp_put(tmp);
2261			}
2262			hlist_del(&entry->next);
2263			lec_arp_add(priv, entry);
2264			goto out;
2265		}
2266	}
2267	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2268out:
2269	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270}
2271
2272MODULE_LICENSE("GPL");