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, unsigned int txqueue)
 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		fallthrough;
 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	seq_printf(seq, "%pM ", entry->mac_addr);
 803	seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
 804	seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
 
 
 
 
 
 805		   entry->flags & 0xffff);
 806	if (entry->vcc)
 807		seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 808	else
 809		seq_printf(seq, "        ");
 810	if (entry->recv_vcc) {
 811		seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 812			   entry->recv_vcc->vci);
 813	}
 814	seq_putc(seq, '\n');
 815}
 816
 817struct lec_state {
 818	unsigned long flags;
 819	struct lec_priv *locked;
 820	struct hlist_node *node;
 821	struct net_device *dev;
 822	int itf;
 823	int arp_table;
 824	int misc_table;
 825};
 826
 827static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 828			  loff_t *l)
 829{
 830	struct hlist_node *e = state->node;
 831
 832	if (!e)
 833		e = tbl->first;
 834	if (e == SEQ_START_TOKEN) {
 835		e = tbl->first;
 836		--*l;
 837	}
 838
 839	for (; e; e = e->next) {
 840		if (--*l < 0)
 841			break;
 842	}
 843	state->node = e;
 844
 845	return (*l < 0) ? state : NULL;
 846}
 847
 848static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 849			  struct lec_priv *priv)
 850{
 851	void *v = NULL;
 852	int p;
 853
 854	for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 855		v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 856		if (v)
 857			break;
 858	}
 859	state->arp_table = p;
 860	return v;
 861}
 862
 863static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 864			   struct lec_priv *priv)
 865{
 866	struct hlist_head *lec_misc_tables[] = {
 867		&priv->lec_arp_empty_ones,
 868		&priv->lec_no_forward,
 869		&priv->mcast_fwds
 870	};
 871	void *v = NULL;
 872	int q;
 873
 874	for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 875		v = lec_tbl_walk(state, lec_misc_tables[q], l);
 876		if (v)
 877			break;
 878	}
 879	state->misc_table = q;
 880	return v;
 881}
 882
 883static void *lec_priv_walk(struct lec_state *state, loff_t *l,
 884			   struct lec_priv *priv)
 885{
 886	if (!state->locked) {
 887		state->locked = priv;
 888		spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
 889	}
 890	if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
 891		spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
 892		state->locked = NULL;
 893		/* Partial state reset for the next time we get called */
 894		state->arp_table = state->misc_table = 0;
 895	}
 896	return state->locked;
 897}
 898
 899static void *lec_itf_walk(struct lec_state *state, loff_t *l)
 900{
 901	struct net_device *dev;
 902	void *v;
 903
 904	dev = state->dev ? state->dev : dev_lec[state->itf];
 905	v = (dev && netdev_priv(dev)) ?
 906		lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
 907	if (!v && dev) {
 908		dev_put(dev);
 909		/* Partial state reset for the next time we get called */
 910		dev = NULL;
 911	}
 912	state->dev = dev;
 913	return v;
 914}
 915
 916static void *lec_get_idx(struct lec_state *state, loff_t l)
 917{
 918	void *v = NULL;
 919
 920	for (; state->itf < MAX_LEC_ITF; state->itf++) {
 921		v = lec_itf_walk(state, &l);
 922		if (v)
 923			break;
 924	}
 925	return v;
 926}
 927
 928static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
 929{
 930	struct lec_state *state = seq->private;
 931
 932	state->itf = 0;
 933	state->dev = NULL;
 934	state->locked = NULL;
 935	state->arp_table = 0;
 936	state->misc_table = 0;
 937	state->node = SEQ_START_TOKEN;
 938
 939	return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
 940}
 941
 942static void lec_seq_stop(struct seq_file *seq, void *v)
 943{
 944	struct lec_state *state = seq->private;
 945
 946	if (state->dev) {
 947		spin_unlock_irqrestore(&state->locked->lec_arp_lock,
 948				       state->flags);
 949		dev_put(state->dev);
 950	}
 951}
 952
 953static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 954{
 955	struct lec_state *state = seq->private;
 956
 957	++*pos;
 958	return lec_get_idx(state, 1);
 
 959}
 960
 961static int lec_seq_show(struct seq_file *seq, void *v)
 962{
 963	static const char lec_banner[] =
 964	    "Itf  MAC          ATM destination"
 965	    "                          Status            Flags "
 966	    "VPI/VCI Recv VPI/VCI\n";
 967
 968	if (v == SEQ_START_TOKEN)
 969		seq_puts(seq, lec_banner);
 970	else {
 971		struct lec_state *state = seq->private;
 972		struct net_device *dev = state->dev;
 973		struct lec_arp_table *entry = hlist_entry(state->node,
 974							  struct lec_arp_table,
 975							  next);
 976
 977		seq_printf(seq, "%s ", dev->name);
 978		lec_info(seq, entry);
 979	}
 980	return 0;
 981}
 982
 983static const struct seq_operations lec_seq_ops = {
 984	.start = lec_seq_start,
 985	.next = lec_seq_next,
 986	.stop = lec_seq_stop,
 987	.show = lec_seq_show,
 988};
 
 
 
 
 
 
 
 
 
 
 
 
 989#endif
 990
 991static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 992{
 993	struct atm_vcc *vcc = ATM_SD(sock);
 994	int err = 0;
 995
 996	switch (cmd) {
 997	case ATMLEC_CTRL:
 998	case ATMLEC_MCAST:
 999	case ATMLEC_DATA:
1000		if (!capable(CAP_NET_ADMIN))
1001			return -EPERM;
1002		break;
1003	default:
1004		return -ENOIOCTLCMD;
1005	}
1006
1007	switch (cmd) {
1008	case ATMLEC_CTRL:
1009		err = lecd_attach(vcc, (int)arg);
1010		if (err >= 0)
1011			sock->state = SS_CONNECTED;
1012		break;
1013	case ATMLEC_MCAST:
1014		err = lec_mcast_attach(vcc, (int)arg);
1015		break;
1016	case ATMLEC_DATA:
1017		err = lec_vcc_attach(vcc, (void __user *)arg);
1018		break;
1019	}
1020
1021	return err;
1022}
1023
1024static struct atm_ioctl lane_ioctl_ops = {
1025	.owner = THIS_MODULE,
1026	.ioctl = lane_ioctl,
1027};
1028
1029static int __init lane_module_init(void)
1030{
1031#ifdef CONFIG_PROC_FS
1032	struct proc_dir_entry *p;
1033
1034	p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1035			sizeof(struct lec_state), NULL);
1036	if (!p) {
1037		pr_err("Unable to initialize /proc/net/atm/lec\n");
1038		return -ENOMEM;
1039	}
1040#endif
1041
1042	register_atm_ioctl(&lane_ioctl_ops);
1043	pr_info("lec.c: initialized\n");
1044	return 0;
1045}
1046
1047static void __exit lane_module_cleanup(void)
1048{
1049	int i;
1050
1051#ifdef CONFIG_PROC_FS
1052	remove_proc_entry("lec", atm_proc_root);
1053#endif
1054
1055	deregister_atm_ioctl(&lane_ioctl_ops);
1056
1057	for (i = 0; i < MAX_LEC_ITF; i++) {
1058		if (dev_lec[i] != NULL) {
1059			unregister_netdev(dev_lec[i]);
1060			free_netdev(dev_lec[i]);
1061			dev_lec[i] = NULL;
1062		}
1063	}
1064}
1065
1066module_init(lane_module_init);
1067module_exit(lane_module_cleanup);
1068
1069/*
1070 * LANE2: 3.1.3, LE_RESOLVE.request
1071 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1072 * If sizeoftlvs == NULL the default TLVs associated with this
1073 * lec will be used.
1074 * If dst_mac == NULL, targetless LE_ARP will be sent
1075 */
1076static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1077			 u8 **tlvs, u32 *sizeoftlvs)
1078{
1079	unsigned long flags;
1080	struct lec_priv *priv = netdev_priv(dev);
1081	struct lec_arp_table *table;
1082	struct sk_buff *skb;
1083	int retval;
1084
1085	if (force == 0) {
1086		spin_lock_irqsave(&priv->lec_arp_lock, flags);
1087		table = lec_arp_find(priv, dst_mac);
1088		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1089		if (table == NULL)
1090			return -1;
1091
1092		*tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1093		if (*tlvs == NULL)
1094			return -1;
1095
1096		*sizeoftlvs = table->sizeoftlvs;
1097
1098		return 0;
1099	}
1100
1101	if (sizeoftlvs == NULL)
1102		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1103
1104	else {
1105		skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1106		if (skb == NULL)
1107			return -1;
1108		skb->len = *sizeoftlvs;
1109		skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1110		retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1111	}
1112	return retval;
1113}
1114
1115/*
1116 * LANE2: 3.1.4, LE_ASSOCIATE.request
1117 * Associate the *tlvs with the *lan_dst address.
1118 * Will overwrite any previous association
1119 * Returns 1 for success, 0 for failure (out of memory)
1120 *
1121 */
1122static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1123			       const u8 *tlvs, u32 sizeoftlvs)
1124{
1125	int retval;
1126	struct sk_buff *skb;
1127	struct lec_priv *priv = netdev_priv(dev);
1128
1129	if (!ether_addr_equal(lan_dst, dev->dev_addr))
1130		return 0;	/* not our mac address */
1131
1132	kfree(priv->tlvs);	/* NULL if there was no previous association */
1133
1134	priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1135	if (priv->tlvs == NULL)
1136		return 0;
1137	priv->sizeoftlvs = sizeoftlvs;
1138
1139	skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1140	if (skb == NULL)
1141		return 0;
1142	skb->len = sizeoftlvs;
1143	skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1144	retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1145	if (retval != 0)
1146		pr_info("lec.c: lane2_associate_req() failed\n");
1147	/*
1148	 * If the previous association has changed we must
1149	 * somehow notify other LANE entities about the change
1150	 */
1151	return 1;
1152}
1153
1154/*
1155 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1156 *
1157 */
1158static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1159				const u8 *tlvs, u32 sizeoftlvs)
1160{
1161#if 0
1162	int i = 0;
1163#endif
1164	struct lec_priv *priv = netdev_priv(dev);
1165#if 0				/*
1166				 * Why have the TLVs in LE_ARP entries
1167				 * since we do not use them? When you
1168				 * uncomment this code, make sure the
1169				 * TLVs get freed when entry is killed
1170				 */
1171	struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1172
1173	if (entry == NULL)
1174		return;		/* should not happen */
1175
1176	kfree(entry->tlvs);
1177
1178	entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1179	if (entry->tlvs == NULL)
1180		return;
1181	entry->sizeoftlvs = sizeoftlvs;
1182#endif
1183#if 0
1184	pr_info("\n");
1185	pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1186	while (i < sizeoftlvs)
1187		pr_cont("%02x ", tlvs[i++]);
1188
1189	pr_cont("\n");
1190#endif
1191
1192	/* tell MPOA about the TLVs we saw */
1193	if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1194		priv->lane2_ops->associate_indicator(dev, mac_addr,
1195						     tlvs, sizeoftlvs);
1196	}
1197}
1198
1199/*
1200 * Here starts what used to lec_arpc.c
1201 *
1202 * lec_arpc.c was added here when making
1203 * lane client modular. October 1997
1204 */
1205
1206#include <linux/types.h>
1207#include <linux/timer.h>
1208#include <linux/param.h>
1209#include <linux/atomic.h>
1210#include <linux/inetdevice.h>
1211#include <net/route.h>
1212
1213#if 0
1214#define pr_debug(format, args...)
1215/*
1216  #define pr_debug printk
1217*/
1218#endif
1219#define DEBUG_ARP_TABLE 0
1220
1221#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1222
1223static void lec_arp_check_expire(struct work_struct *work);
1224static void lec_arp_expire_arp(struct timer_list *t);
1225
1226/*
1227 * Arp table funcs
1228 */
1229
1230#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1231
1232/*
1233 * Initialization of arp-cache
1234 */
1235static void lec_arp_init(struct lec_priv *priv)
1236{
1237	unsigned short i;
1238
1239	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1240		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1241	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1242	INIT_HLIST_HEAD(&priv->lec_no_forward);
1243	INIT_HLIST_HEAD(&priv->mcast_fwds);
1244	spin_lock_init(&priv->lec_arp_lock);
1245	INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1246	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1247}
1248
1249static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1250{
1251	if (entry->vcc) {
1252		struct atm_vcc *vcc = entry->vcc;
1253		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1254		struct net_device *dev = (struct net_device *)vcc->proto_data;
1255
1256		vcc->pop = vpriv->old_pop;
1257		if (vpriv->xoff)
1258			netif_wake_queue(dev);
1259		kfree(vpriv);
1260		vcc->user_back = NULL;
1261		vcc->push = entry->old_push;
1262		vcc_release_async(vcc, -EPIPE);
1263		entry->vcc = NULL;
1264	}
1265	if (entry->recv_vcc) {
1266		struct atm_vcc *vcc = entry->recv_vcc;
1267		struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1268
1269		kfree(vpriv);
1270		vcc->user_back = NULL;
1271
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, 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: %*ph ", ATM_ESA_LEN,
1368					  rulla->atm_addr);
 
 
 
 
1369			offset += sprintf(buf + offset,
1370					  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1371					  rulla->vcc ? rulla->vcc->vpi : 0,
1372					  rulla->vcc ? rulla->vcc->vci : 0,
1373					  rulla->recv_vcc ? rulla->recv_vcc->
1374					  vpi : 0,
1375					  rulla->recv_vcc ? rulla->recv_vcc->
1376					  vci : 0, rulla->last_used,
1377					  rulla->timestamp, rulla->no_tries);
1378			offset +=
1379			    sprintf(buf + offset,
1380				    "Flags:%x, Packets_flooded:%x, Status: %s ",
1381				    rulla->flags, rulla->packets_flooded,
1382				    get_status_string(rulla->status));
1383			pr_info("%s\n", buf);
1384		}
1385	}
1386
1387	if (!hlist_empty(&priv->lec_no_forward))
1388		pr_info("No forward\n");
1389	hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1390		offset = 0;
1391		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1392		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1393				  rulla->atm_addr);
 
 
 
1394		offset += sprintf(buf + offset,
1395				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1396				  rulla->vcc ? rulla->vcc->vpi : 0,
1397				  rulla->vcc ? rulla->vcc->vci : 0,
1398				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1399				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1400				  rulla->last_used,
1401				  rulla->timestamp, rulla->no_tries);
1402		offset += sprintf(buf + offset,
1403				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1404				  rulla->flags, rulla->packets_flooded,
1405				  get_status_string(rulla->status));
1406		pr_info("%s\n", buf);
1407	}
1408
1409	if (!hlist_empty(&priv->lec_arp_empty_ones))
1410		pr_info("Empty ones\n");
1411	hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1412		offset = 0;
1413		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1414		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1415				  rulla->atm_addr);
 
 
 
1416		offset += sprintf(buf + offset,
1417				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1418				  rulla->vcc ? rulla->vcc->vpi : 0,
1419				  rulla->vcc ? rulla->vcc->vci : 0,
1420				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1421				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1422				  rulla->last_used,
1423				  rulla->timestamp, rulla->no_tries);
1424		offset += sprintf(buf + offset,
1425				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1426				  rulla->flags, rulla->packets_flooded,
1427				  get_status_string(rulla->status));
1428		pr_info("%s", buf);
1429	}
1430
1431	if (!hlist_empty(&priv->mcast_fwds))
1432		pr_info("Multicast Forward VCCs\n");
1433	hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1434		offset = 0;
1435		offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1436		offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1437				  rulla->atm_addr);
 
 
 
1438		offset += sprintf(buf + offset,
1439				  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1440				  rulla->vcc ? rulla->vcc->vpi : 0,
1441				  rulla->vcc ? rulla->vcc->vci : 0,
1442				  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1443				  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1444				  rulla->last_used,
1445				  rulla->timestamp, rulla->no_tries);
1446		offset += sprintf(buf + offset,
1447				  "Flags:%x, Packets_flooded:%x, Status: %s ",
1448				  rulla->flags, rulla->packets_flooded,
1449				  get_status_string(rulla->status));
1450		pr_info("%s\n", buf);
1451	}
1452
1453}
1454#else
1455#define dump_arp_table(priv) do { } while (0)
1456#endif
1457
1458/*
1459 * Destruction of arp-cache
1460 */
1461static void lec_arp_destroy(struct lec_priv *priv)
1462{
1463	unsigned long flags;
1464	struct hlist_node *next;
1465	struct lec_arp_table *entry;
1466	int i;
1467
1468	cancel_delayed_work_sync(&priv->lec_arp_work);
1469
1470	/*
1471	 * Remove all entries
1472	 */
1473
1474	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1475	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1476		hlist_for_each_entry_safe(entry, next,
1477					  &priv->lec_arp_tables[i], next) {
1478			lec_arp_remove(priv, entry);
1479			lec_arp_put(entry);
1480		}
1481		INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1482	}
1483
1484	hlist_for_each_entry_safe(entry, next,
1485				  &priv->lec_arp_empty_ones, next) {
1486		del_timer_sync(&entry->timer);
1487		lec_arp_clear_vccs(entry);
1488		hlist_del(&entry->next);
1489		lec_arp_put(entry);
1490	}
1491	INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1492
1493	hlist_for_each_entry_safe(entry, next,
1494				  &priv->lec_no_forward, next) {
1495		del_timer_sync(&entry->timer);
1496		lec_arp_clear_vccs(entry);
1497		hlist_del(&entry->next);
1498		lec_arp_put(entry);
1499	}
1500	INIT_HLIST_HEAD(&priv->lec_no_forward);
1501
1502	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1503		/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1504		lec_arp_clear_vccs(entry);
1505		hlist_del(&entry->next);
1506		lec_arp_put(entry);
1507	}
1508	INIT_HLIST_HEAD(&priv->mcast_fwds);
1509	priv->mcast_vcc = NULL;
1510	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1511}
1512
1513/*
1514 * Find entry by mac_address
1515 */
1516static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1517					  const unsigned char *mac_addr)
1518{
1519	struct hlist_head *head;
1520	struct lec_arp_table *entry;
1521
1522	pr_debug("%pM\n", mac_addr);
1523
1524	head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1525	hlist_for_each_entry(entry, head, next) {
1526		if (ether_addr_equal(mac_addr, entry->mac_addr))
1527			return entry;
1528	}
1529	return NULL;
1530}
1531
1532static struct lec_arp_table *make_entry(struct lec_priv *priv,
1533					const unsigned char *mac_addr)
1534{
1535	struct lec_arp_table *to_return;
1536
1537	to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1538	if (!to_return)
 
1539		return NULL;
 
1540	ether_addr_copy(to_return->mac_addr, mac_addr);
1541	INIT_HLIST_NODE(&to_return->next);
1542	timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1543	to_return->last_used = jiffies;
1544	to_return->priv = priv;
1545	skb_queue_head_init(&to_return->tx_wait);
1546	refcount_set(&to_return->usage, 1);
1547	return to_return;
1548}
1549
1550/* Arp sent timer expired */
1551static void lec_arp_expire_arp(struct timer_list *t)
1552{
1553	struct lec_arp_table *entry;
1554
1555	entry = from_timer(entry, t, timer);
1556
1557	pr_debug("\n");
1558	if (entry->status == ESI_ARP_PENDING) {
1559		if (entry->no_tries <= entry->priv->max_retry_count) {
1560			if (entry->is_rdesc)
1561				send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1562					     entry->mac_addr, NULL, NULL);
1563			else
1564				send_to_lecd(entry->priv, l_arp_xmt,
1565					     entry->mac_addr, NULL, NULL);
1566			entry->no_tries++;
1567		}
1568		mod_timer(&entry->timer, jiffies + (1 * HZ));
1569	}
1570}
1571
1572/* Unknown/unused vcc expire, remove associated entry */
1573static void lec_arp_expire_vcc(struct timer_list *t)
1574{
1575	unsigned long flags;
1576	struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1577	struct lec_priv *priv = to_remove->priv;
1578
1579	del_timer(&to_remove->timer);
1580
1581	pr_debug("%p %p: vpi:%d vci:%d\n",
1582		 to_remove, priv,
1583		 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1584		 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1585
1586	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1587	hlist_del(&to_remove->next);
1588	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1589
1590	lec_arp_clear_vccs(to_remove);
1591	lec_arp_put(to_remove);
1592}
1593
1594static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1595				   unsigned long now,
1596				   struct lec_priv *priv)
1597{
1598	unsigned long time_to_check;
1599
1600	if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1601		time_to_check = priv->forward_delay_time;
1602	else
1603		time_to_check = priv->aging_time;
1604
1605	pr_debug("About to expire: %lx - %lx > %lx\n",
1606		 now, entry->last_used, time_to_check);
1607	if (time_after(now, entry->last_used + time_to_check) &&
1608	    !(entry->flags & LEC_PERMANENT_FLAG) &&
1609	    !(entry->mac_addr[0] & 0x01)) {	/* LANE2: 7.1.20 */
1610		/* Remove entry */
1611		pr_debug("Entry timed out\n");
1612		lec_arp_remove(priv, entry);
1613		lec_arp_put(entry);
1614	} else {
1615		/* Something else */
1616		if ((entry->status == ESI_VC_PENDING ||
1617		     entry->status == ESI_ARP_PENDING) &&
1618		    time_after_eq(now, entry->timestamp +
1619				       priv->max_unknown_frame_time)) {
1620			entry->timestamp = jiffies;
1621			entry->packets_flooded = 0;
1622			if (entry->status == ESI_VC_PENDING)
1623				send_to_lecd(priv, l_svc_setup,
1624					     entry->mac_addr,
1625					     entry->atm_addr,
1626					     NULL);
1627		}
1628		if (entry->status == ESI_FLUSH_PENDING &&
1629		    time_after_eq(now, entry->timestamp +
1630				       priv->path_switching_delay)) {
1631			lec_arp_hold(entry);
1632			return true;
1633		}
1634	}
1635
1636	return false;
1637}
1638/*
1639 * Expire entries.
1640 * 1. Re-set timer
1641 * 2. For each entry, delete entries that have aged past the age limit.
1642 * 3. For each entry, depending on the status of the entry, perform
1643 *    the following maintenance.
1644 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1645 *       tick_count is above the max_unknown_frame_time, clear
1646 *       the tick_count to zero and clear the packets_flooded counter
1647 *       to zero. This supports the packet rate limit per address
1648 *       while flooding unknowns.
1649 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1650 *       than or equal to the path_switching_delay, change the status
1651 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1652 *       regardless of the progress of the flush protocol.
1653 */
1654static void lec_arp_check_expire(struct work_struct *work)
1655{
1656	unsigned long flags;
1657	struct lec_priv *priv =
1658		container_of(work, struct lec_priv, lec_arp_work.work);
1659	struct hlist_node *next;
1660	struct lec_arp_table *entry;
1661	unsigned long now;
1662	int i;
1663
1664	pr_debug("%p\n", priv);
1665	now = jiffies;
1666restart:
1667	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1668	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1669		hlist_for_each_entry_safe(entry, next,
1670					  &priv->lec_arp_tables[i], next) {
1671			if (__lec_arp_check_expire(entry, now, priv)) {
1672				struct sk_buff *skb;
1673				struct atm_vcc *vcc = entry->vcc;
1674
1675				spin_unlock_irqrestore(&priv->lec_arp_lock,
1676						       flags);
1677				while ((skb = skb_dequeue(&entry->tx_wait)))
1678					lec_send(vcc, skb);
1679				entry->last_used = jiffies;
1680				entry->status = ESI_FORWARD_DIRECT;
1681				lec_arp_put(entry);
1682
1683				goto restart;
1684			}
1685		}
1686	}
1687	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1688
1689	schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1690}
1691
1692/*
1693 * Try to find vcc where mac_address is attached.
1694 *
1695 */
1696static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1697				       const unsigned char *mac_to_find,
1698				       int is_rdesc,
1699				       struct lec_arp_table **ret_entry)
1700{
1701	unsigned long flags;
1702	struct lec_arp_table *entry;
1703	struct atm_vcc *found;
1704
1705	if (mac_to_find[0] & 0x01) {
1706		switch (priv->lane_version) {
1707		case 1:
1708			return priv->mcast_vcc;
1709		case 2:	/* LANE2 wants arp for multicast addresses */
1710			if (ether_addr_equal(mac_to_find, bus_mac))
1711				return priv->mcast_vcc;
1712			break;
1713		default:
1714			break;
1715		}
1716	}
1717
1718	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1719	entry = lec_arp_find(priv, mac_to_find);
1720
1721	if (entry) {
1722		if (entry->status == ESI_FORWARD_DIRECT) {
1723			/* Connection Ok */
1724			entry->last_used = jiffies;
1725			lec_arp_hold(entry);
1726			*ret_entry = entry;
1727			found = entry->vcc;
1728			goto out;
1729		}
1730		/*
1731		 * If the LE_ARP cache entry is still pending, reset count to 0
1732		 * so another LE_ARP request can be made for this frame.
1733		 */
1734		if (entry->status == ESI_ARP_PENDING)
1735			entry->no_tries = 0;
1736		/*
1737		 * Data direct VC not yet set up, check to see if the unknown
1738		 * frame count is greater than the limit. If the limit has
1739		 * not been reached, allow the caller to send packet to
1740		 * BUS.
1741		 */
1742		if (entry->status != ESI_FLUSH_PENDING &&
1743		    entry->packets_flooded <
1744		    priv->maximum_unknown_frame_count) {
1745			entry->packets_flooded++;
1746			pr_debug("Flooding..\n");
1747			found = priv->mcast_vcc;
1748			goto out;
1749		}
1750		/*
1751		 * We got here because entry->status == ESI_FLUSH_PENDING
1752		 * or BUS flood limit was reached for an entry which is
1753		 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1754		 */
1755		lec_arp_hold(entry);
1756		*ret_entry = entry;
1757		pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1758			 entry->vcc);
1759		found = NULL;
1760	} else {
1761		/* No matching entry was found */
1762		entry = make_entry(priv, mac_to_find);
1763		pr_debug("Making entry\n");
1764		if (!entry) {
1765			found = priv->mcast_vcc;
1766			goto out;
1767		}
1768		lec_arp_add(priv, entry);
1769		/* We want arp-request(s) to be sent */
1770		entry->packets_flooded = 1;
1771		entry->status = ESI_ARP_PENDING;
1772		entry->no_tries = 1;
1773		entry->last_used = entry->timestamp = jiffies;
1774		entry->is_rdesc = is_rdesc;
1775		if (entry->is_rdesc)
1776			send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1777				     NULL);
1778		else
1779			send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1780		entry->timer.expires = jiffies + (1 * HZ);
1781		entry->timer.function = lec_arp_expire_arp;
1782		add_timer(&entry->timer);
1783		found = priv->mcast_vcc;
1784	}
1785
1786out:
1787	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1788	return found;
1789}
1790
1791static int
1792lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1793		unsigned long permanent)
1794{
1795	unsigned long flags;
1796	struct hlist_node *next;
1797	struct lec_arp_table *entry;
1798	int i;
1799
1800	pr_debug("\n");
1801	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1802	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1803		hlist_for_each_entry_safe(entry, next,
1804					  &priv->lec_arp_tables[i], next) {
1805			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1806			    (permanent ||
1807			     !(entry->flags & LEC_PERMANENT_FLAG))) {
1808				lec_arp_remove(priv, entry);
1809				lec_arp_put(entry);
1810			}
1811			spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1812			return 0;
1813		}
1814	}
1815	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1816	return -1;
1817}
1818
1819/*
1820 * Notifies:  Response to arp_request (atm_addr != NULL)
1821 */
1822static void
1823lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1824	       const unsigned char *atm_addr, unsigned long remoteflag,
1825	       unsigned int targetless_le_arp)
1826{
1827	unsigned long flags;
1828	struct hlist_node *next;
1829	struct lec_arp_table *entry, *tmp;
1830	int i;
1831
1832	pr_debug("%smac:%pM\n",
1833		 (targetless_le_arp) ? "targetless " : "", mac_addr);
1834
1835	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1836	entry = lec_arp_find(priv, mac_addr);
1837	if (entry == NULL && targetless_le_arp)
1838		goto out;	/*
1839				 * LANE2: ignore targetless LE_ARPs for which
1840				 * we have no entry in the cache. 7.1.30
1841				 */
1842	if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1843		hlist_for_each_entry_safe(entry, next,
1844					  &priv->lec_arp_empty_ones, next) {
1845			if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1846				hlist_del(&entry->next);
1847				del_timer(&entry->timer);
1848				tmp = lec_arp_find(priv, mac_addr);
1849				if (tmp) {
1850					del_timer(&tmp->timer);
1851					tmp->status = ESI_FORWARD_DIRECT;
1852					memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1853					tmp->vcc = entry->vcc;
1854					tmp->old_push = entry->old_push;
1855					tmp->last_used = jiffies;
1856					del_timer(&entry->timer);
1857					lec_arp_put(entry);
1858					entry = tmp;
1859				} else {
1860					entry->status = ESI_FORWARD_DIRECT;
1861					ether_addr_copy(entry->mac_addr,
1862							mac_addr);
1863					entry->last_used = jiffies;
1864					lec_arp_add(priv, entry);
1865				}
1866				if (remoteflag)
1867					entry->flags |= LEC_REMOTE_FLAG;
1868				else
1869					entry->flags &= ~LEC_REMOTE_FLAG;
1870				pr_debug("After update\n");
1871				dump_arp_table(priv);
1872				goto out;
1873			}
1874		}
1875	}
1876
1877	entry = lec_arp_find(priv, mac_addr);
1878	if (!entry) {
1879		entry = make_entry(priv, mac_addr);
1880		if (!entry)
1881			goto out;
1882		entry->status = ESI_UNKNOWN;
1883		lec_arp_add(priv, entry);
1884		/* Temporary, changes before end of function */
1885	}
1886	memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1887	del_timer(&entry->timer);
1888	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1889		hlist_for_each_entry(tmp,
1890				     &priv->lec_arp_tables[i], next) {
1891			if (entry != tmp &&
1892			    !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1893				/* Vcc to this host exists */
1894				if (tmp->status > ESI_VC_PENDING) {
1895					/*
1896					 * ESI_FLUSH_PENDING,
1897					 * ESI_FORWARD_DIRECT
1898					 */
1899					entry->vcc = tmp->vcc;
1900					entry->old_push = tmp->old_push;
1901				}
1902				entry->status = tmp->status;
1903				break;
1904			}
1905		}
1906	}
1907	if (remoteflag)
1908		entry->flags |= LEC_REMOTE_FLAG;
1909	else
1910		entry->flags &= ~LEC_REMOTE_FLAG;
1911	if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1912		entry->status = ESI_VC_PENDING;
1913		send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1914	}
1915	pr_debug("After update2\n");
1916	dump_arp_table(priv);
1917out:
1918	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1919}
1920
1921/*
1922 * Notifies: Vcc setup ready
1923 */
1924static void
1925lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1926	      struct atm_vcc *vcc,
1927	      void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1928{
1929	unsigned long flags;
1930	struct lec_arp_table *entry;
1931	int i, found_entry = 0;
1932
1933	spin_lock_irqsave(&priv->lec_arp_lock, flags);
1934	/* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1935	if (ioc_data->receive == 2) {
1936		pr_debug("LEC_ARP: Attaching mcast forward\n");
1937#if 0
1938		entry = lec_arp_find(priv, bus_mac);
1939		if (!entry) {
1940			pr_info("LEC_ARP: Multicast entry not found!\n");
1941			goto out;
1942		}
1943		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1944		entry->recv_vcc = vcc;
1945		entry->old_recv_push = old_push;
1946#endif
1947		entry = make_entry(priv, bus_mac);
1948		if (entry == NULL)
1949			goto out;
1950		del_timer(&entry->timer);
1951		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1952		entry->recv_vcc = vcc;
1953		entry->old_recv_push = old_push;
1954		hlist_add_head(&entry->next, &priv->mcast_fwds);
1955		goto out;
1956	} else if (ioc_data->receive == 1) {
1957		/*
1958		 * Vcc which we don't want to make default vcc,
1959		 * attach it anyway.
1960		 */
1961		pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1962			 ATM_ESA_LEN, ioc_data->atm_addr);
 
 
 
 
 
 
 
 
 
1963		entry = make_entry(priv, bus_mac);
1964		if (entry == NULL)
1965			goto out;
1966		memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1967		eth_zero_addr(entry->mac_addr);
1968		entry->recv_vcc = vcc;
1969		entry->old_recv_push = old_push;
1970		entry->status = ESI_UNKNOWN;
1971		entry->timer.expires = jiffies + priv->vcc_timeout_period;
1972		entry->timer.function = lec_arp_expire_vcc;
1973		hlist_add_head(&entry->next, &priv->lec_no_forward);
1974		add_timer(&entry->timer);
1975		dump_arp_table(priv);
1976		goto out;
1977	}
1978	pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1979		 ATM_ESA_LEN, ioc_data->atm_addr);
 
 
 
 
 
 
 
 
 
1980	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1981		hlist_for_each_entry(entry,
1982				     &priv->lec_arp_tables[i], next) {
1983			if (memcmp
1984			    (ioc_data->atm_addr, entry->atm_addr,
1985			     ATM_ESA_LEN) == 0) {
1986				pr_debug("LEC_ARP: Attaching data direct\n");
1987				pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1988					 entry->vcc ? entry->vcc->vci : 0,
1989					 entry->recv_vcc ? entry->recv_vcc->
1990					 vci : 0);
1991				found_entry = 1;
1992				del_timer(&entry->timer);
1993				entry->vcc = vcc;
1994				entry->old_push = old_push;
1995				if (entry->status == ESI_VC_PENDING) {
1996					if (priv->maximum_unknown_frame_count
1997					    == 0)
1998						entry->status =
1999						    ESI_FORWARD_DIRECT;
2000					else {
2001						entry->timestamp = jiffies;
2002						entry->status =
2003						    ESI_FLUSH_PENDING;
2004#if 0
2005						send_to_lecd(priv, l_flush_xmt,
2006							     NULL,
2007							     entry->atm_addr,
2008							     NULL);
2009#endif
2010					}
2011				} else {
2012					/*
2013					 * They were forming a connection
2014					 * to us, and we to them. Our
2015					 * ATM address is numerically lower
2016					 * than theirs, so we make connection
2017					 * we formed into default VCC (8.1.11).
2018					 * Connection they made gets torn
2019					 * down. This might confuse some
2020					 * clients. Can be changed if
2021					 * someone reports trouble...
2022					 */
2023					;
2024				}
2025			}
2026		}
2027	}
2028	if (found_entry) {
2029		pr_debug("After vcc was added\n");
2030		dump_arp_table(priv);
2031		goto out;
2032	}
2033	/*
2034	 * Not found, snatch address from first data packet that arrives
2035	 * from this vcc
2036	 */
2037	entry = make_entry(priv, bus_mac);
2038	if (!entry)
2039		goto out;
2040	entry->vcc = vcc;
2041	entry->old_push = old_push;
2042	memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2043	eth_zero_addr(entry->mac_addr);
2044	entry->status = ESI_UNKNOWN;
2045	hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2046	entry->timer.expires = jiffies + priv->vcc_timeout_period;
2047	entry->timer.function = lec_arp_expire_vcc;
2048	add_timer(&entry->timer);
2049	pr_debug("After vcc was added\n");
2050	dump_arp_table(priv);
2051out:
2052	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2053}
2054
2055static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2056{
2057	unsigned long flags;
2058	struct lec_arp_table *entry;
2059	int i;
2060
2061	pr_debug("%lx\n", tran_id);
2062restart:
2063	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2064	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2065		hlist_for_each_entry(entry,
2066				     &priv->lec_arp_tables[i], next) {
2067			if (entry->flush_tran_id == tran_id &&
2068			    entry->status == ESI_FLUSH_PENDING) {
2069				struct sk_buff *skb;
2070				struct atm_vcc *vcc = entry->vcc;
2071
2072				lec_arp_hold(entry);
2073				spin_unlock_irqrestore(&priv->lec_arp_lock,
2074						       flags);
2075				while ((skb = skb_dequeue(&entry->tx_wait)))
2076					lec_send(vcc, skb);
2077				entry->last_used = jiffies;
2078				entry->status = ESI_FORWARD_DIRECT;
2079				lec_arp_put(entry);
2080				pr_debug("LEC_ARP: Flushed\n");
2081				goto restart;
2082			}
2083		}
2084	}
2085	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2086	dump_arp_table(priv);
2087}
2088
2089static void
2090lec_set_flush_tran_id(struct lec_priv *priv,
2091		      const unsigned char *atm_addr, unsigned long tran_id)
2092{
2093	unsigned long flags;
2094	struct lec_arp_table *entry;
2095	int i;
2096
2097	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2098	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2099		hlist_for_each_entry(entry,
2100				     &priv->lec_arp_tables[i], next) {
2101			if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2102				entry->flush_tran_id = tran_id;
2103				pr_debug("Set flush transaction id to %lx for %p\n",
2104					 tran_id, entry);
2105			}
2106		}
2107	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2108}
2109
2110static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2111{
2112	unsigned long flags;
2113	unsigned char mac_addr[] = {
2114		0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2115	};
2116	struct lec_arp_table *to_add;
2117	struct lec_vcc_priv *vpriv;
2118	int err = 0;
2119
2120	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2121	if (!vpriv)
2122		return -ENOMEM;
2123	vpriv->xoff = 0;
2124	vpriv->old_pop = vcc->pop;
2125	vcc->user_back = vpriv;
2126	vcc->pop = lec_pop;
2127	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2128	to_add = make_entry(priv, mac_addr);
2129	if (!to_add) {
2130		vcc->pop = vpriv->old_pop;
2131		kfree(vpriv);
2132		err = -ENOMEM;
2133		goto out;
2134	}
2135	memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2136	to_add->status = ESI_FORWARD_DIRECT;
2137	to_add->flags |= LEC_PERMANENT_FLAG;
2138	to_add->vcc = vcc;
2139	to_add->old_push = vcc->push;
2140	vcc->push = lec_push;
2141	priv->mcast_vcc = vcc;
2142	lec_arp_add(priv, to_add);
2143out:
2144	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2145	return err;
2146}
2147
2148static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2149{
2150	unsigned long flags;
2151	struct hlist_node *next;
2152	struct lec_arp_table *entry;
2153	int i;
2154
2155	pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2156	dump_arp_table(priv);
2157
2158	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2159
2160	for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2161		hlist_for_each_entry_safe(entry, next,
2162					  &priv->lec_arp_tables[i], next) {
2163			if (vcc == entry->vcc) {
2164				lec_arp_remove(priv, entry);
2165				lec_arp_put(entry);
2166				if (priv->mcast_vcc == vcc)
2167					priv->mcast_vcc = NULL;
2168			}
2169		}
2170	}
2171
2172	hlist_for_each_entry_safe(entry, next,
2173				  &priv->lec_arp_empty_ones, next) {
2174		if (entry->vcc == vcc) {
2175			lec_arp_clear_vccs(entry);
2176			del_timer(&entry->timer);
2177			hlist_del(&entry->next);
2178			lec_arp_put(entry);
2179		}
2180	}
2181
2182	hlist_for_each_entry_safe(entry, next,
2183				  &priv->lec_no_forward, next) {
2184		if (entry->recv_vcc == vcc) {
2185			lec_arp_clear_vccs(entry);
2186			del_timer(&entry->timer);
2187			hlist_del(&entry->next);
2188			lec_arp_put(entry);
2189		}
2190	}
2191
2192	hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2193		if (entry->recv_vcc == vcc) {
2194			lec_arp_clear_vccs(entry);
2195			/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2196			hlist_del(&entry->next);
2197			lec_arp_put(entry);
2198		}
2199	}
2200
2201	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2202	dump_arp_table(priv);
2203}
2204
2205static void
2206lec_arp_check_empties(struct lec_priv *priv,
2207		      struct atm_vcc *vcc, struct sk_buff *skb)
2208{
2209	unsigned long flags;
2210	struct hlist_node *next;
2211	struct lec_arp_table *entry, *tmp;
2212	struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2213	unsigned char *src = hdr->h_source;
2214
2215	spin_lock_irqsave(&priv->lec_arp_lock, flags);
2216	hlist_for_each_entry_safe(entry, next,
2217				  &priv->lec_arp_empty_ones, next) {
2218		if (vcc == entry->vcc) {
2219			del_timer(&entry->timer);
2220			ether_addr_copy(entry->mac_addr, src);
2221			entry->status = ESI_FORWARD_DIRECT;
2222			entry->last_used = jiffies;
2223			/* We might have got an entry */
2224			tmp = lec_arp_find(priv, src);
2225			if (tmp) {
2226				lec_arp_remove(priv, tmp);
2227				lec_arp_put(tmp);
2228			}
2229			hlist_del(&entry->next);
2230			lec_arp_add(priv, entry);
2231			goto out;
2232		}
2233	}
2234	pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2235out:
2236	spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2237}
2238
2239MODULE_LICENSE("GPL");