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