linux/net/atm/lec.c
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   1/*
   2 * lec.c: Lan Emulation driver
   3 *
   4 * Marko Kiiskila <mkiiskila@yahoo.com>
   5 */
   6
   7#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   8
   9#include <linux/slab.h>
  10#include <linux/kernel.h>
  11#include <linux/bitops.h>
  12#include <linux/capability.h>
  13
  14/* We are ethernet device */
  15#include <linux/if_ether.h>
  16#include <linux/netdevice.h>
  17#include <linux/etherdevice.h>
  18#include <net/sock.h>
  19#include <linux/skbuff.h>
  20#include <linux/ip.h>
  21#include <asm/byteorder.h>
  22#include <linux/uaccess.h>
  23#include <net/arp.h>
  24#include <net/dst.h>
  25#include <linux/proc_fs.h>
  26#include <linux/spinlock.h>
  27#include <linux/seq_file.h>
  28
  29/* TokenRing if needed */
  30#ifdef CONFIG_TR
  31#include <linux/trdevice.h>
  32#endif
  33
  34/* And atm device */
  35#include <linux/atmdev.h>
  36#include <linux/atmlec.h>
  37
  38/* Proxy LEC knows about bridging */
  39#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  40#include "../bridge/br_private.h"
  41
  42static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  43#endif
  44
  45/* Modular too */
  46#include <linux/module.h>
  47#include <linux/init.h>
  48
  49#include "lec.h"
  50#include "lec_arpc.h"
  51#include "resources.h"
  52
  53#define DUMP_PACKETS 0          /*
  54                                 * 0 = None,
  55                                 * 1 = 30 first bytes
  56                                 * 2 = Whole packet
  57                                 */
  58
  59#define LEC_UNRES_QUE_LEN 8     /*
  60                                 * number of tx packets to queue for a
  61                                 * single destination while waiting for SVC
  62                                 */
  63
  64static int lec_open(struct net_device *dev);
  65static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  66                                  struct net_device *dev);
  67static int lec_close(struct net_device *dev);
  68static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  69                                          const unsigned char *mac_addr);
  70static int lec_arp_remove(struct lec_priv *priv,
  71                          struct lec_arp_table *to_remove);
  72/* LANE2 functions */
  73static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  74                                const u8 *tlvs, u32 sizeoftlvs);
  75static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  76                         u8 **tlvs, u32 *sizeoftlvs);
  77static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  78                               const u8 *tlvs, u32 sizeoftlvs);
  79
  80static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  81                           unsigned long permanent);
  82static void lec_arp_check_empties(struct lec_priv *priv,
  83                                  struct atm_vcc *vcc, struct sk_buff *skb);
  84static void lec_arp_destroy(struct lec_priv *priv);
  85static void lec_arp_init(struct lec_priv *priv);
  86static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  87                                       const unsigned char *mac_to_find,
  88                                       int is_rdesc,
  89                                       struct lec_arp_table **ret_entry);
  90static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  91                           const unsigned char *atm_addr,
  92                           unsigned long remoteflag,
  93                           unsigned int targetless_le_arp);
  94static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  95static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  96static void lec_set_flush_tran_id(struct lec_priv *priv,
  97                                  const unsigned char *atm_addr,
  98                                  unsigned long tran_id);
  99static void lec_vcc_added(struct lec_priv *priv,
 100                          const struct atmlec_ioc *ioc_data,
 101                          struct atm_vcc *vcc,
 102                          void (*old_push)(struct atm_vcc *vcc,
 103                                           struct sk_buff *skb));
 104static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 105
 106/* must be done under lec_arp_lock */
 107static inline void lec_arp_hold(struct lec_arp_table *entry)
 108{
 109        atomic_inc(&entry->usage);
 110}
 111
 112static inline void lec_arp_put(struct lec_arp_table *entry)
 113{
 114        if (atomic_dec_and_test(&entry->usage))
 115                kfree(entry);
 116}
 117
 118static struct lane2_ops lane2_ops = {
 119        lane2_resolve,          /* resolve,             spec 3.1.3 */
 120        lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 121        NULL                    /* associate indicator, spec 3.1.5 */
 122};
 123
 124static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 125
 126/* Device structures */
 127static struct net_device *dev_lec[MAX_LEC_ITF];
 128
 129#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 130static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 131{
 132        struct ethhdr *eth;
 133        char *buff;
 134        struct lec_priv *priv;
 135
 136        /*
 137         * Check if this is a BPDU. If so, ask zeppelin to send
 138         * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 139         * as the Config BPDU has
 140         */
 141        eth = (struct ethhdr *)skb->data;
 142        buff = skb->data + skb->dev->hard_header_len;
 143        if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 144                struct sock *sk;
 145                struct sk_buff *skb2;
 146                struct atmlec_msg *mesg;
 147
 148                skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 149                if (skb2 == NULL)
 150                        return;
 151                skb2->len = sizeof(struct atmlec_msg);
 152                mesg = (struct atmlec_msg *)skb2->data;
 153                mesg->type = l_topology_change;
 154                buff += 4;
 155                mesg->content.normal.flag = *buff & 0x01;
 156                                        /* 0x01 is topology change */
 157
 158                priv = netdev_priv(dev);
 159                atm_force_charge(priv->lecd, skb2->truesize);
 160                sk = sk_atm(priv->lecd);
 161                skb_queue_tail(&sk->sk_receive_queue, skb2);
 162                sk->sk_data_ready(sk, skb2->len);
 163        }
 164}
 165#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 166
 167/*
 168 * Modelled after tr_type_trans
 169 * All multicast and ARE or STE frames go to BUS.
 170 * Non source routed frames go by destination address.
 171 * Last hop source routed frames go by destination address.
 172 * Not last hop source routed frames go by _next_ route descriptor.
 173 * Returns pointer to destination MAC address or fills in rdesc
 174 * and returns NULL.
 175 */
 176#ifdef CONFIG_TR
 177static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 178{
 179        struct trh_hdr *trh;
 180        unsigned int riflen, num_rdsc;
 181
 182        trh = (struct trh_hdr *)packet;
 183        if (trh->daddr[0] & (uint8_t) 0x80)
 184                return bus_mac; /* multicast */
 185
 186        if (trh->saddr[0] & TR_RII) {
 187                riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 188                if ((ntohs(trh->rcf) >> 13) != 0)
 189                        return bus_mac; /* ARE or STE */
 190        } else
 191                return trh->daddr;      /* not source routed */
 192
 193        if (riflen < 6)
 194                return trh->daddr;      /* last hop, source routed */
 195
 196        /* riflen is 6 or more, packet has more than one route descriptor */
 197        num_rdsc = (riflen / 2) - 1;
 198        memset(rdesc, 0, ETH_ALEN);
 199        /* offset 4 comes from LAN destination field in LE control frames */
 200        if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 201                memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 202        else {
 203                memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 204                rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 205        }
 206
 207        return NULL;
 208}
 209#endif /* CONFIG_TR */
 210
 211/*
 212 * Open/initialize the netdevice. This is called (in the current kernel)
 213 * sometime after booting when the 'ifconfig' program is run.
 214 *
 215 * This routine should set everything up anew at each open, even
 216 * registers that "should" only need to be set once at boot, so that
 217 * there is non-reboot way to recover if something goes wrong.
 218 */
 219
 220static int lec_open(struct net_device *dev)
 221{
 222        netif_start_queue(dev);
 223        memset(&dev->stats, 0, sizeof(struct net_device_stats));
 224
 225        return 0;
 226}
 227
 228static void
 229lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 230{
 231        struct net_device *dev = skb->dev;
 232
 233        ATM_SKB(skb)->vcc = vcc;
 234        ATM_SKB(skb)->atm_options = vcc->atm_options;
 235
 236        atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 237        if (vcc->send(vcc, skb) < 0) {
 238                dev->stats.tx_dropped++;
 239                return;
 240        }
 241
 242        dev->stats.tx_packets++;
 243        dev->stats.tx_bytes += skb->len;
 244}
 245
 246static void lec_tx_timeout(struct net_device *dev)
 247{
 248        pr_info("%s\n", dev->name);
 249        dev->trans_start = jiffies;
 250        netif_wake_queue(dev);
 251}
 252
 253static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 254                                  struct net_device *dev)
 255{
 256        struct sk_buff *skb2;
 257        struct lec_priv *priv = netdev_priv(dev);
 258        struct lecdatahdr_8023 *lec_h;
 259        struct atm_vcc *vcc;
 260        struct lec_arp_table *entry;
 261        unsigned char *dst;
 262        int min_frame_size;
 263#ifdef CONFIG_TR
 264        unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 265#endif
 266        int is_rdesc;
 267
 268        pr_debug("called\n");
 269        if (!priv->lecd) {
 270                pr_info("%s:No lecd attached\n", dev->name);
 271                dev->stats.tx_errors++;
 272                netif_stop_queue(dev);
 273                kfree_skb(skb);
 274                return NETDEV_TX_OK;
 275        }
 276
 277        pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 278                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 279                 (long)skb_end_pointer(skb));
 280#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 281        if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 282                lec_handle_bridge(skb, dev);
 283#endif
 284
 285        /* Make sure we have room for lec_id */
 286        if (skb_headroom(skb) < 2) {
 287                pr_debug("reallocating skb\n");
 288                skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 289                kfree_skb(skb);
 290                if (skb2 == NULL)
 291                        return NETDEV_TX_OK;
 292                skb = skb2;
 293        }
 294        skb_push(skb, 2);
 295
 296        /* Put le header to place, works for TokenRing too */
 297        lec_h = (struct lecdatahdr_8023 *)skb->data;
 298        lec_h->le_header = htons(priv->lecid);
 299
 300#ifdef CONFIG_TR
 301        /*
 302         * Ugly. Use this to realign Token Ring packets for
 303         * e.g. PCA-200E driver.
 304         */
 305        if (priv->is_trdev) {
 306                skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 307                kfree_skb(skb);
 308                if (skb2 == NULL)
 309                        return NETDEV_TX_OK;
 310                skb = skb2;
 311        }
 312#endif
 313
 314#if DUMP_PACKETS >= 2
 315#define MAX_DUMP_SKB 99
 316#elif DUMP_PACKETS >= 1
 317#define MAX_DUMP_SKB 30
 318#endif
 319#if DUMP_PACKETS >= 1
 320        printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 321               dev->name, skb->len, priv->lecid);
 322        print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 323                       skb->data, min(skb->len, MAX_DUMP_SKB), true);
 324#endif /* DUMP_PACKETS >= 1 */
 325
 326        /* Minimum ethernet-frame size */
 327#ifdef CONFIG_TR
 328        if (priv->is_trdev)
 329                min_frame_size = LEC_MINIMUM_8025_SIZE;
 330        else
 331#endif
 332                min_frame_size = LEC_MINIMUM_8023_SIZE;
 333        if (skb->len < min_frame_size) {
 334                if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 335                        skb2 = skb_copy_expand(skb, 0,
 336                                               min_frame_size - skb->truesize,
 337                                               GFP_ATOMIC);
 338                        dev_kfree_skb(skb);
 339                        if (skb2 == NULL) {
 340                                dev->stats.tx_dropped++;
 341                                return NETDEV_TX_OK;
 342                        }
 343                        skb = skb2;
 344                }
 345                skb_put(skb, min_frame_size - skb->len);
 346        }
 347
 348        /* Send to right vcc */
 349        is_rdesc = 0;
 350        dst = lec_h->h_dest;
 351#ifdef CONFIG_TR
 352        if (priv->is_trdev) {
 353                dst = get_tr_dst(skb->data + 2, rdesc);
 354                if (dst == NULL) {
 355                        dst = rdesc;
 356                        is_rdesc = 1;
 357                }
 358        }
 359#endif
 360        entry = NULL;
 361        vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 362        pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 363                 dev->name, vcc, vcc ? vcc->flags : 0, entry);
 364        if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 365                if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 366                        pr_debug("%s:queuing packet, MAC address %pM\n",
 367                                 dev->name, lec_h->h_dest);
 368                        skb_queue_tail(&entry->tx_wait, skb);
 369                } else {
 370                        pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 371                                 dev->name, lec_h->h_dest);
 372                        dev->stats.tx_dropped++;
 373                        dev_kfree_skb(skb);
 374                }
 375                goto out;
 376        }
 377#if DUMP_PACKETS > 0
 378        printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 379               dev->name, vcc->vpi, vcc->vci);
 380#endif /* DUMP_PACKETS > 0 */
 381
 382        while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 383                pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 384                lec_send(vcc, skb2);
 385        }
 386
 387        lec_send(vcc, skb);
 388
 389        if (!atm_may_send(vcc, 0)) {
 390                struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 391
 392                vpriv->xoff = 1;
 393                netif_stop_queue(dev);
 394
 395                /*
 396                 * vcc->pop() might have occurred in between, making
 397                 * the vcc usuable again.  Since xmit is serialized,
 398                 * this is the only situation we have to re-test.
 399                 */
 400
 401                if (atm_may_send(vcc, 0))
 402                        netif_wake_queue(dev);
 403        }
 404
 405out:
 406        if (entry)
 407                lec_arp_put(entry);
 408        dev->trans_start = jiffies;
 409        return NETDEV_TX_OK;
 410}
 411
 412/* The inverse routine to net_open(). */
 413static int lec_close(struct net_device *dev)
 414{
 415        netif_stop_queue(dev);
 416        return 0;
 417}
 418
 419static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 420{
 421        unsigned long flags;
 422        struct net_device *dev = (struct net_device *)vcc->proto_data;
 423        struct lec_priv *priv = netdev_priv(dev);
 424        struct atmlec_msg *mesg;
 425        struct lec_arp_table *entry;
 426        int i;
 427        char *tmp;              /* FIXME */
 428
 429        atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 430        mesg = (struct atmlec_msg *)skb->data;
 431        tmp = skb->data;
 432        tmp += sizeof(struct atmlec_msg);
 433        pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 434        switch (mesg->type) {
 435        case l_set_mac_addr:
 436                for (i = 0; i < 6; i++)
 437                        dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 438                break;
 439        case l_del_mac_addr:
 440                for (i = 0; i < 6; i++)
 441                        dev->dev_addr[i] = 0;
 442                break;
 443        case l_addr_delete:
 444                lec_addr_delete(priv, mesg->content.normal.atm_addr,
 445                                mesg->content.normal.flag);
 446                break;
 447        case l_topology_change:
 448                priv->topology_change = mesg->content.normal.flag;
 449                break;
 450        case l_flush_complete:
 451                lec_flush_complete(priv, mesg->content.normal.flag);
 452                break;
 453        case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 454                spin_lock_irqsave(&priv->lec_arp_lock, flags);
 455                entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 456                lec_arp_remove(priv, entry);
 457                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 458
 459                if (mesg->content.normal.no_source_le_narp)
 460                        break;
 461                /* FALL THROUGH */
 462        case l_arp_update:
 463                lec_arp_update(priv, mesg->content.normal.mac_addr,
 464                               mesg->content.normal.atm_addr,
 465                               mesg->content.normal.flag,
 466                               mesg->content.normal.targetless_le_arp);
 467                pr_debug("in l_arp_update\n");
 468                if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 469                        pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 470                                 mesg->sizeoftlvs);
 471                        lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 472                                            tmp, mesg->sizeoftlvs);
 473                }
 474                break;
 475        case l_config:
 476                priv->maximum_unknown_frame_count =
 477                    mesg->content.config.maximum_unknown_frame_count;
 478                priv->max_unknown_frame_time =
 479                    (mesg->content.config.max_unknown_frame_time * HZ);
 480                priv->max_retry_count = mesg->content.config.max_retry_count;
 481                priv->aging_time = (mesg->content.config.aging_time * HZ);
 482                priv->forward_delay_time =
 483                    (mesg->content.config.forward_delay_time * HZ);
 484                priv->arp_response_time =
 485                    (mesg->content.config.arp_response_time * HZ);
 486                priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 487                priv->path_switching_delay =
 488                    (mesg->content.config.path_switching_delay * HZ);
 489                priv->lane_version = mesg->content.config.lane_version;
 490                                        /* LANE2 */
 491                priv->lane2_ops = NULL;
 492                if (priv->lane_version > 1)
 493                        priv->lane2_ops = &lane2_ops;
 494                if (dev_set_mtu(dev, mesg->content.config.mtu))
 495                        pr_info("%s: change_mtu to %d failed\n",
 496                                dev->name, mesg->content.config.mtu);
 497                priv->is_proxy = mesg->content.config.is_proxy;
 498                break;
 499        case l_flush_tran_id:
 500                lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 501                                      mesg->content.normal.flag);
 502                break;
 503        case l_set_lecid:
 504                priv->lecid =
 505                    (unsigned short)(0xffff & mesg->content.normal.flag);
 506                break;
 507        case l_should_bridge:
 508#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 509        {
 510                pr_debug("%s: bridge zeppelin asks about %pM\n",
 511                         dev->name, mesg->content.proxy.mac_addr);
 512
 513                if (br_fdb_test_addr_hook == NULL)
 514                        break;
 515
 516                if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 517                        /* hit from bridge table, send LE_ARP_RESPONSE */
 518                        struct sk_buff *skb2;
 519                        struct sock *sk;
 520
 521                        pr_debug("%s: entry found, responding to zeppelin\n",
 522                                 dev->name);
 523                        skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 524                        if (skb2 == NULL)
 525                                break;
 526                        skb2->len = sizeof(struct atmlec_msg);
 527                        skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 528                        atm_force_charge(priv->lecd, skb2->truesize);
 529                        sk = sk_atm(priv->lecd);
 530                        skb_queue_tail(&sk->sk_receive_queue, skb2);
 531                        sk->sk_data_ready(sk, skb2->len);
 532                }
 533        }
 534#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 535                break;
 536        default:
 537                pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 538                dev_kfree_skb(skb);
 539                return -EINVAL;
 540        }
 541        dev_kfree_skb(skb);
 542        return 0;
 543}
 544
 545static void lec_atm_close(struct atm_vcc *vcc)
 546{
 547        struct sk_buff *skb;
 548        struct net_device *dev = (struct net_device *)vcc->proto_data;
 549        struct lec_priv *priv = netdev_priv(dev);
 550
 551        priv->lecd = NULL;
 552        /* Do something needful? */
 553
 554        netif_stop_queue(dev);
 555        lec_arp_destroy(priv);
 556
 557        if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 558                pr_info("%s closing with messages pending\n", dev->name);
 559        while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 560                atm_return(vcc, skb->truesize);
 561                dev_kfree_skb(skb);
 562        }
 563
 564        pr_info("%s: Shut down!\n", dev->name);
 565        module_put(THIS_MODULE);
 566}
 567
 568static struct atmdev_ops lecdev_ops = {
 569        .close = lec_atm_close,
 570        .send = lec_atm_send
 571};
 572
 573static struct atm_dev lecatm_dev = {
 574        .ops = &lecdev_ops,
 575        .type = "lec",
 576        .number = 999,          /* dummy device number */
 577        .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 578};
 579
 580/*
 581 * LANE2: new argument struct sk_buff *data contains
 582 * the LE_ARP based TLVs introduced in the LANE2 spec
 583 */
 584static int
 585send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 586             const unsigned char *mac_addr, const unsigned char *atm_addr,
 587             struct sk_buff *data)
 588{
 589        struct sock *sk;
 590        struct sk_buff *skb;
 591        struct atmlec_msg *mesg;
 592
 593        if (!priv || !priv->lecd)
 594                return -1;
 595        skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 596        if (!skb)
 597                return -1;
 598        skb->len = sizeof(struct atmlec_msg);
 599        mesg = (struct atmlec_msg *)skb->data;
 600        memset(mesg, 0, sizeof(struct atmlec_msg));
 601        mesg->type = type;
 602        if (data != NULL)
 603                mesg->sizeoftlvs = data->len;
 604        if (mac_addr)
 605                memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 606        else
 607                mesg->content.normal.targetless_le_arp = 1;
 608        if (atm_addr)
 609                memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 610
 611        atm_force_charge(priv->lecd, skb->truesize);
 612        sk = sk_atm(priv->lecd);
 613        skb_queue_tail(&sk->sk_receive_queue, skb);
 614        sk->sk_data_ready(sk, skb->len);
 615
 616        if (data != NULL) {
 617                pr_debug("about to send %d bytes of data\n", data->len);
 618                atm_force_charge(priv->lecd, data->truesize);
 619                skb_queue_tail(&sk->sk_receive_queue, data);
 620                sk->sk_data_ready(sk, skb->len);
 621        }
 622
 623        return 0;
 624}
 625
 626/* shamelessly stolen from drivers/net/net_init.c */
 627static int lec_change_mtu(struct net_device *dev, int new_mtu)
 628{
 629        if ((new_mtu < 68) || (new_mtu > 18190))
 630                return -EINVAL;
 631        dev->mtu = new_mtu;
 632        return 0;
 633}
 634
 635static void lec_set_multicast_list(struct net_device *dev)
 636{
 637        /*
 638         * by default, all multicast frames arrive over the bus.
 639         * eventually support selective multicast service
 640         */
 641}
 642
 643static const struct net_device_ops lec_netdev_ops = {
 644        .ndo_open               = lec_open,
 645        .ndo_stop               = lec_close,
 646        .ndo_start_xmit         = lec_start_xmit,
 647        .ndo_change_mtu         = lec_change_mtu,
 648        .ndo_tx_timeout         = lec_tx_timeout,
 649        .ndo_set_multicast_list = lec_set_multicast_list,
 650};
 651
 652static const unsigned char lec_ctrl_magic[] = {
 653        0xff,
 654        0x00,
 655        0x01,
 656        0x01
 657};
 658
 659#define LEC_DATA_DIRECT_8023  2
 660#define LEC_DATA_DIRECT_8025  3
 661
 662static int lec_is_data_direct(struct atm_vcc *vcc)
 663{
 664        return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 665                (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 666}
 667
 668static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 669{
 670        unsigned long flags;
 671        struct net_device *dev = (struct net_device *)vcc->proto_data;
 672        struct lec_priv *priv = netdev_priv(dev);
 673
 674#if DUMP_PACKETS > 0
 675        printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 676               dev->name, vcc->vpi, vcc->vci);
 677#endif
 678        if (!skb) {
 679                pr_debug("%s: null skb\n", dev->name);
 680                lec_vcc_close(priv, vcc);
 681                return;
 682        }
 683#if DUMP_PACKETS >= 2
 684#define MAX_SKB_DUMP 99
 685#elif DUMP_PACKETS >= 1
 686#define MAX_SKB_DUMP 30
 687#endif
 688#if DUMP_PACKETS > 0
 689        printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 690               dev->name, skb->len, priv->lecid);
 691        print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 692                       skb->data, min(MAX_SKB_DUMP, skb->len), true);
 693#endif /* DUMP_PACKETS > 0 */
 694        if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 695                                /* Control frame, to daemon */
 696                struct sock *sk = sk_atm(vcc);
 697
 698                pr_debug("%s: To daemon\n", dev->name);
 699                skb_queue_tail(&sk->sk_receive_queue, skb);
 700                sk->sk_data_ready(sk, skb->len);
 701        } else {                /* Data frame, queue to protocol handlers */
 702                struct lec_arp_table *entry;
 703                unsigned char *src, *dst;
 704
 705                atm_return(vcc, skb->truesize);
 706                if (*(__be16 *) skb->data == htons(priv->lecid) ||
 707                    !priv->lecd || !(dev->flags & IFF_UP)) {
 708                        /*
 709                         * Probably looping back, or if lecd is missing,
 710                         * lecd has gone down
 711                         */
 712                        pr_debug("Ignoring frame...\n");
 713                        dev_kfree_skb(skb);
 714                        return;
 715                }
 716#ifdef CONFIG_TR
 717                if (priv->is_trdev)
 718                        dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 719                else
 720#endif
 721                        dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 722
 723                /*
 724                 * If this is a Data Direct VCC, and the VCC does not match
 725                 * the LE_ARP cache entry, delete the LE_ARP cache entry.
 726                 */
 727                spin_lock_irqsave(&priv->lec_arp_lock, flags);
 728                if (lec_is_data_direct(vcc)) {
 729#ifdef CONFIG_TR
 730                        if (priv->is_trdev)
 731                                src =
 732                                    ((struct lecdatahdr_8025 *)skb->data)->
 733                                    h_source;
 734                        else
 735#endif
 736                                src =
 737                                    ((struct lecdatahdr_8023 *)skb->data)->
 738                                    h_source;
 739                        entry = lec_arp_find(priv, src);
 740                        if (entry && entry->vcc != vcc) {
 741                                lec_arp_remove(priv, entry);
 742                                lec_arp_put(entry);
 743                        }
 744                }
 745                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 746
 747                if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 748                    !priv->is_proxy &&  /* Proxy wants all the packets */
 749                    memcmp(dst, dev->dev_addr, dev->addr_len)) {
 750                        dev_kfree_skb(skb);
 751                        return;
 752                }
 753                if (!hlist_empty(&priv->lec_arp_empty_ones))
 754                        lec_arp_check_empties(priv, vcc, skb);
 755                skb_pull(skb, 2);       /* skip lec_id */
 756#ifdef CONFIG_TR
 757                if (priv->is_trdev)
 758                        skb->protocol = tr_type_trans(skb, dev);
 759                else
 760#endif
 761                        skb->protocol = eth_type_trans(skb, dev);
 762                dev->stats.rx_packets++;
 763                dev->stats.rx_bytes += skb->len;
 764                memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 765                netif_rx(skb);
 766        }
 767}
 768
 769static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 770{
 771        struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 772        struct net_device *dev = skb->dev;
 773
 774        if (vpriv == NULL) {
 775                pr_info("vpriv = NULL!?!?!?\n");
 776                return;
 777        }
 778
 779        vpriv->old_pop(vcc, skb);
 780
 781        if (vpriv->xoff && atm_may_send(vcc, 0)) {
 782                vpriv->xoff = 0;
 783                if (netif_running(dev) && netif_queue_stopped(dev))
 784                        netif_wake_queue(dev);
 785        }
 786}
 787
 788static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 789{
 790        struct lec_vcc_priv *vpriv;
 791        int bytes_left;
 792        struct atmlec_ioc ioc_data;
 793
 794        /* Lecd must be up in this case */
 795        bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 796        if (bytes_left != 0)
 797                pr_info("copy from user failed for %d bytes\n", bytes_left);
 798        if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 799            !dev_lec[ioc_data.dev_num])
 800                return -EINVAL;
 801        vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 802        if (!vpriv)
 803                return -ENOMEM;
 804        vpriv->xoff = 0;
 805        vpriv->old_pop = vcc->pop;
 806        vcc->user_back = vpriv;
 807        vcc->pop = lec_pop;
 808        lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 809                      &ioc_data, vcc, vcc->push);
 810        vcc->proto_data = dev_lec[ioc_data.dev_num];
 811        vcc->push = lec_push;
 812        return 0;
 813}
 814
 815static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 816{
 817        if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 818                return -EINVAL;
 819        vcc->proto_data = dev_lec[arg];
 820        return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 821                                vcc);
 822}
 823
 824/* Initialize device. */
 825static int lecd_attach(struct atm_vcc *vcc, int arg)
 826{
 827        int i;
 828        struct lec_priv *priv;
 829
 830        if (arg < 0)
 831                i = 0;
 832        else
 833                i = arg;
 834#ifdef CONFIG_TR
 835        if (arg >= MAX_LEC_ITF)
 836                return -EINVAL;
 837#else                           /* Reserve the top NUM_TR_DEVS for TR */
 838        if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 839                return -EINVAL;
 840#endif
 841        if (!dev_lec[i]) {
 842                int is_trdev, size;
 843
 844                is_trdev = 0;
 845                if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 846                        is_trdev = 1;
 847
 848                size = sizeof(struct lec_priv);
 849#ifdef CONFIG_TR
 850                if (is_trdev)
 851                        dev_lec[i] = alloc_trdev(size);
 852                else
 853#endif
 854                        dev_lec[i] = alloc_etherdev(size);
 855                if (!dev_lec[i])
 856                        return -ENOMEM;
 857                dev_lec[i]->netdev_ops = &lec_netdev_ops;
 858                snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 859                if (register_netdev(dev_lec[i])) {
 860                        free_netdev(dev_lec[i]);
 861                        return -EINVAL;
 862                }
 863
 864                priv = netdev_priv(dev_lec[i]);
 865                priv->is_trdev = is_trdev;
 866        } else {
 867                priv = netdev_priv(dev_lec[i]);
 868                if (priv->lecd)
 869                        return -EADDRINUSE;
 870        }
 871        lec_arp_init(priv);
 872        priv->itfnum = i;       /* LANE2 addition */
 873        priv->lecd = vcc;
 874        vcc->dev = &lecatm_dev;
 875        vcc_insert_socket(sk_atm(vcc));
 876
 877        vcc->proto_data = dev_lec[i];
 878        set_bit(ATM_VF_META, &vcc->flags);
 879        set_bit(ATM_VF_READY, &vcc->flags);
 880
 881        /* Set default values to these variables */
 882        priv->maximum_unknown_frame_count = 1;
 883        priv->max_unknown_frame_time = (1 * HZ);
 884        priv->vcc_timeout_period = (1200 * HZ);
 885        priv->max_retry_count = 1;
 886        priv->aging_time = (300 * HZ);
 887        priv->forward_delay_time = (15 * HZ);
 888        priv->topology_change = 0;
 889        priv->arp_response_time = (1 * HZ);
 890        priv->flush_timeout = (4 * HZ);
 891        priv->path_switching_delay = (6 * HZ);
 892
 893        if (dev_lec[i]->flags & IFF_UP)
 894                netif_start_queue(dev_lec[i]);
 895        __module_get(THIS_MODULE);
 896        return i;
 897}
 898
 899#ifdef CONFIG_PROC_FS
 900static const char *lec_arp_get_status_string(unsigned char status)
 901{
 902        static const char *const lec_arp_status_string[] = {
 903                "ESI_UNKNOWN       ",
 904                "ESI_ARP_PENDING   ",
 905                "ESI_VC_PENDING    ",
 906                "<Undefined>       ",
 907                "ESI_FLUSH_PENDING ",
 908                "ESI_FORWARD_DIRECT"
 909        };
 910
 911        if (status > ESI_FORWARD_DIRECT)
 912                status = 3;     /* ESI_UNDEFINED */
 913        return lec_arp_status_string[status];
 914}
 915
 916static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 917{
 918        int i;
 919
 920        for (i = 0; i < ETH_ALEN; i++)
 921                seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 922        seq_printf(seq, " ");
 923        for (i = 0; i < ATM_ESA_LEN; i++)
 924                seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 925        seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 926                   entry->flags & 0xffff);
 927        if (entry->vcc)
 928                seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 929        else
 930                seq_printf(seq, "        ");
 931        if (entry->recv_vcc) {
 932                seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 933                           entry->recv_vcc->vci);
 934        }
 935        seq_putc(seq, '\n');
 936}
 937
 938struct lec_state {
 939        unsigned long flags;
 940        struct lec_priv *locked;
 941        struct hlist_node *node;
 942        struct net_device *dev;
 943        int itf;
 944        int arp_table;
 945        int misc_table;
 946};
 947
 948static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 949                          loff_t *l)
 950{
 951        struct hlist_node *e = state->node;
 952        struct lec_arp_table *tmp;
 953
 954        if (!e)
 955                e = tbl->first;
 956        if (e == SEQ_START_TOKEN) {
 957                e = tbl->first;
 958                --*l;
 959        }
 960
 961        hlist_for_each_entry_from(tmp, e, next) {
 962                if (--*l < 0)
 963                        break;
 964        }
 965        state->node = e;
 966
 967        return (*l < 0) ? state : NULL;
 968}
 969
 970static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 971                          struct lec_priv *priv)
 972{
 973        void *v = NULL;
 974        int p;
 975
 976        for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 977                v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 978                if (v)
 979                        break;
 980        }
 981        state->arp_table = p;
 982        return v;
 983}
 984
 985static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 986                           struct lec_priv *priv)
 987{
 988        struct hlist_head *lec_misc_tables[] = {
 989                &priv->lec_arp_empty_ones,
 990                &priv->lec_no_forward,
 991                &priv->mcast_fwds
 992        };
 993        void *v = NULL;
 994        int q;
 995
 996        for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
 997                v = lec_tbl_walk(state, lec_misc_tables[q], l);
 998                if (v)
 999                        break;
1000        }
1001        state->misc_table = q;
1002        return v;
1003}
1004
1005static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1006                           struct lec_priv *priv)
1007{
1008        if (!state->locked) {
1009                state->locked = priv;
1010                spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1011        }
1012        if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1013                spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1014                state->locked = NULL;
1015                /* Partial state reset for the next time we get called */
1016                state->arp_table = state->misc_table = 0;
1017        }
1018        return state->locked;
1019}
1020
1021static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1022{
1023        struct net_device *dev;
1024        void *v;
1025
1026        dev = state->dev ? state->dev : dev_lec[state->itf];
1027        v = (dev && netdev_priv(dev)) ?
1028                lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1029        if (!v && dev) {
1030                dev_put(dev);
1031                /* Partial state reset for the next time we get called */
1032                dev = NULL;
1033        }
1034        state->dev = dev;
1035        return v;
1036}
1037
1038static void *lec_get_idx(struct lec_state *state, loff_t l)
1039{
1040        void *v = NULL;
1041
1042        for (; state->itf < MAX_LEC_ITF; state->itf++) {
1043                v = lec_itf_walk(state, &l);
1044                if (v)
1045                        break;
1046        }
1047        return v;
1048}
1049
1050static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1051{
1052        struct lec_state *state = seq->private;
1053
1054        state->itf = 0;
1055        state->dev = NULL;
1056        state->locked = NULL;
1057        state->arp_table = 0;
1058        state->misc_table = 0;
1059        state->node = SEQ_START_TOKEN;
1060
1061        return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1062}
1063
1064static void lec_seq_stop(struct seq_file *seq, void *v)
1065{
1066        struct lec_state *state = seq->private;
1067
1068        if (state->dev) {
1069                spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1070                                       state->flags);
1071                dev_put(state->dev);
1072        }
1073}
1074
1075static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1076{
1077        struct lec_state *state = seq->private;
1078
1079        v = lec_get_idx(state, 1);
1080        *pos += !!PTR_ERR(v);
1081        return v;
1082}
1083
1084static int lec_seq_show(struct seq_file *seq, void *v)
1085{
1086        static const char lec_banner[] =
1087            "Itf  MAC          ATM destination"
1088            "                          Status            Flags "
1089            "VPI/VCI Recv VPI/VCI\n";
1090
1091        if (v == SEQ_START_TOKEN)
1092                seq_puts(seq, lec_banner);
1093        else {
1094                struct lec_state *state = seq->private;
1095                struct net_device *dev = state->dev;
1096                struct lec_arp_table *entry = hlist_entry(state->node,
1097                                                          struct lec_arp_table,
1098                                                          next);
1099
1100                seq_printf(seq, "%s ", dev->name);
1101                lec_info(seq, entry);
1102        }
1103        return 0;
1104}
1105
1106static const struct seq_operations lec_seq_ops = {
1107        .start = lec_seq_start,
1108        .next = lec_seq_next,
1109        .stop = lec_seq_stop,
1110        .show = lec_seq_show,
1111};
1112
1113static int lec_seq_open(struct inode *inode, struct file *file)
1114{
1115        return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1116}
1117
1118static const struct file_operations lec_seq_fops = {
1119        .owner = THIS_MODULE,
1120        .open = lec_seq_open,
1121        .read = seq_read,
1122        .llseek = seq_lseek,
1123        .release = seq_release_private,
1124};
1125#endif
1126
1127static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1128{
1129        struct atm_vcc *vcc = ATM_SD(sock);
1130        int err = 0;
1131
1132        switch (cmd) {
1133        case ATMLEC_CTRL:
1134        case ATMLEC_MCAST:
1135        case ATMLEC_DATA:
1136                if (!capable(CAP_NET_ADMIN))
1137                        return -EPERM;
1138                break;
1139        default:
1140                return -ENOIOCTLCMD;
1141        }
1142
1143        switch (cmd) {
1144        case ATMLEC_CTRL:
1145                err = lecd_attach(vcc, (int)arg);
1146                if (err >= 0)
1147                        sock->state = SS_CONNECTED;
1148                break;
1149        case ATMLEC_MCAST:
1150                err = lec_mcast_attach(vcc, (int)arg);
1151                break;
1152        case ATMLEC_DATA:
1153                err = lec_vcc_attach(vcc, (void __user *)arg);
1154                break;
1155        }
1156
1157        return err;
1158}
1159
1160static struct atm_ioctl lane_ioctl_ops = {
1161        .owner = THIS_MODULE,
1162        .ioctl = lane_ioctl,
1163};
1164
1165static int __init lane_module_init(void)
1166{
1167#ifdef CONFIG_PROC_FS
1168        struct proc_dir_entry *p;
1169
1170        p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1171        if (!p) {
1172                pr_err("Unable to initialize /proc/net/atm/lec\n");
1173                return -ENOMEM;
1174        }
1175#endif
1176
1177        register_atm_ioctl(&lane_ioctl_ops);
1178        pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1179        return 0;
1180}
1181
1182static void __exit lane_module_cleanup(void)
1183{
1184        int i;
1185        struct lec_priv *priv;
1186
1187        remove_proc_entry("lec", atm_proc_root);
1188
1189        deregister_atm_ioctl(&lane_ioctl_ops);
1190
1191        for (i = 0; i < MAX_LEC_ITF; i++) {
1192                if (dev_lec[i] != NULL) {
1193                        priv = netdev_priv(dev_lec[i]);
1194                        unregister_netdev(dev_lec[i]);
1195                        free_netdev(dev_lec[i]);
1196                        dev_lec[i] = NULL;
1197                }
1198        }
1199}
1200
1201module_init(lane_module_init);
1202module_exit(lane_module_cleanup);
1203
1204/*
1205 * LANE2: 3.1.3, LE_RESOLVE.request
1206 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1207 * If sizeoftlvs == NULL the default TLVs associated with with this
1208 * lec will be used.
1209 * If dst_mac == NULL, targetless LE_ARP will be sent
1210 */
1211static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1212                         u8 **tlvs, u32 *sizeoftlvs)
1213{
1214        unsigned long flags;
1215        struct lec_priv *priv = netdev_priv(dev);
1216        struct lec_arp_table *table;
1217        struct sk_buff *skb;
1218        int retval;
1219
1220        if (force == 0) {
1221                spin_lock_irqsave(&priv->lec_arp_lock, flags);
1222                table = lec_arp_find(priv, dst_mac);
1223                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1224                if (table == NULL)
1225                        return -1;
1226
1227                *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1228                if (*tlvs == NULL)
1229                        return -1;
1230
1231                *sizeoftlvs = table->sizeoftlvs;
1232
1233                return 0;
1234        }
1235
1236        if (sizeoftlvs == NULL)
1237                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1238
1239        else {
1240                skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1241                if (skb == NULL)
1242                        return -1;
1243                skb->len = *sizeoftlvs;
1244                skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1245                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1246        }
1247        return retval;
1248}
1249
1250/*
1251 * LANE2: 3.1.4, LE_ASSOCIATE.request
1252 * Associate the *tlvs with the *lan_dst address.
1253 * Will overwrite any previous association
1254 * Returns 1 for success, 0 for failure (out of memory)
1255 *
1256 */
1257static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1258                               const u8 *tlvs, u32 sizeoftlvs)
1259{
1260        int retval;
1261        struct sk_buff *skb;
1262        struct lec_priv *priv = netdev_priv(dev);
1263
1264        if (compare_ether_addr(lan_dst, dev->dev_addr))
1265                return 0;       /* not our mac address */
1266
1267        kfree(priv->tlvs);      /* NULL if there was no previous association */
1268
1269        priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1270        if (priv->tlvs == NULL)
1271                return 0;
1272        priv->sizeoftlvs = sizeoftlvs;
1273
1274        skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1275        if (skb == NULL)
1276                return 0;
1277        skb->len = sizeoftlvs;
1278        skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1279        retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1280        if (retval != 0)
1281                pr_info("lec.c: lane2_associate_req() failed\n");
1282        /*
1283         * If the previous association has changed we must
1284         * somehow notify other LANE entities about the change
1285         */
1286        return 1;
1287}
1288
1289/*
1290 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1291 *
1292 */
1293static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1294                                const u8 *tlvs, u32 sizeoftlvs)
1295{
1296#if 0
1297        int i = 0;
1298#endif
1299        struct lec_priv *priv = netdev_priv(dev);
1300#if 0                           /*
1301                                 * Why have the TLVs in LE_ARP entries
1302                                 * since we do not use them? When you
1303                                 * uncomment this code, make sure the
1304                                 * TLVs get freed when entry is killed
1305                                 */
1306        struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1307
1308        if (entry == NULL)
1309                return;         /* should not happen */
1310
1311        kfree(entry->tlvs);
1312
1313        entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1314        if (entry->tlvs == NULL)
1315                return;
1316        entry->sizeoftlvs = sizeoftlvs;
1317#endif
1318#if 0
1319        pr_info("\n");
1320        pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1321        while (i < sizeoftlvs)
1322                pr_cont("%02x ", tlvs[i++]);
1323
1324        pr_cont("\n");
1325#endif
1326
1327        /* tell MPOA about the TLVs we saw */
1328        if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1329                priv->lane2_ops->associate_indicator(dev, mac_addr,
1330                                                     tlvs, sizeoftlvs);
1331        }
1332}
1333
1334/*
1335 * Here starts what used to lec_arpc.c
1336 *
1337 * lec_arpc.c was added here when making
1338 * lane client modular. October 1997
1339 */
1340
1341#include <linux/types.h>
1342#include <linux/timer.h>
1343#include <linux/param.h>
1344#include <asm/atomic.h>
1345#include <linux/inetdevice.h>
1346#include <net/route.h>
1347
1348#if 0
1349#define pr_debug(format, args...)
1350/*
1351  #define pr_debug printk
1352*/
1353#endif
1354#define DEBUG_ARP_TABLE 0
1355
1356#define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1357
1358static void lec_arp_check_expire(struct work_struct *work);
1359static void lec_arp_expire_arp(unsigned long data);
1360
1361/*
1362 * Arp table funcs
1363 */
1364
1365#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1366
1367/*
1368 * Initialization of arp-cache
1369 */
1370static void lec_arp_init(struct lec_priv *priv)
1371{
1372        unsigned short i;
1373
1374        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1375                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1376        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1377        INIT_HLIST_HEAD(&priv->lec_no_forward);
1378        INIT_HLIST_HEAD(&priv->mcast_fwds);
1379        spin_lock_init(&priv->lec_arp_lock);
1380        INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1381        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1382}
1383
1384static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1385{
1386        if (entry->vcc) {
1387                struct atm_vcc *vcc = entry->vcc;
1388                struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1389                struct net_device *dev = (struct net_device *)vcc->proto_data;
1390
1391                vcc->pop = vpriv->old_pop;
1392                if (vpriv->xoff)
1393                        netif_wake_queue(dev);
1394                kfree(vpriv);
1395                vcc->user_back = NULL;
1396                vcc->push = entry->old_push;
1397                vcc_release_async(vcc, -EPIPE);
1398                entry->vcc = NULL;
1399        }
1400        if (entry->recv_vcc) {
1401                entry->recv_vcc->push = entry->old_recv_push;
1402                vcc_release_async(entry->recv_vcc, -EPIPE);
1403                entry->recv_vcc = NULL;
1404        }
1405}
1406
1407/*
1408 * Insert entry to lec_arp_table
1409 * LANE2: Add to the end of the list to satisfy 8.1.13
1410 */
1411static inline void
1412lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1413{
1414        struct hlist_head *tmp;
1415
1416        tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1417        hlist_add_head(&entry->next, tmp);
1418
1419        pr_debug("Added entry:%pM\n", entry->mac_addr);
1420}
1421
1422/*
1423 * Remove entry from lec_arp_table
1424 */
1425static int
1426lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1427{
1428        struct hlist_node *node;
1429        struct lec_arp_table *entry;
1430        int i, remove_vcc = 1;
1431
1432        if (!to_remove)
1433                return -1;
1434
1435        hlist_del(&to_remove->next);
1436        del_timer(&to_remove->timer);
1437
1438        /*
1439         * If this is the only MAC connected to this VCC,
1440         * also tear down the VCC
1441         */
1442        if (to_remove->status >= ESI_FLUSH_PENDING) {
1443                /*
1444                 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1445                 */
1446                for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1447                        hlist_for_each_entry(entry, node,
1448                                             &priv->lec_arp_tables[i], next) {
1449                                if (memcmp(to_remove->atm_addr,
1450                                           entry->atm_addr, ATM_ESA_LEN) == 0) {
1451                                        remove_vcc = 0;
1452                                        break;
1453                                }
1454                        }
1455                }
1456                if (remove_vcc)
1457                        lec_arp_clear_vccs(to_remove);
1458        }
1459        skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1460
1461        pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1462        return 0;
1463}
1464
1465#if DEBUG_ARP_TABLE
1466static const char *get_status_string(unsigned char st)
1467{
1468        switch (st) {
1469        case ESI_UNKNOWN:
1470                return "ESI_UNKNOWN";
1471        case ESI_ARP_PENDING:
1472                return "ESI_ARP_PENDING";
1473        case ESI_VC_PENDING:
1474                return "ESI_VC_PENDING";
1475        case ESI_FLUSH_PENDING:
1476                return "ESI_FLUSH_PENDING";
1477        case ESI_FORWARD_DIRECT:
1478                return "ESI_FORWARD_DIRECT";
1479        }
1480        return "<UNKNOWN>";
1481}
1482
1483static void dump_arp_table(struct lec_priv *priv)
1484{
1485        struct hlist_node *node;
1486        struct lec_arp_table *rulla;
1487        char buf[256];
1488        int i, j, offset;
1489
1490        pr_info("Dump %p:\n", priv);
1491        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1492                hlist_for_each_entry(rulla, node,
1493                                     &priv->lec_arp_tables[i], next) {
1494                        offset = 0;
1495                        offset += sprintf(buf, "%d: %p\n", i, rulla);
1496                        offset += sprintf(buf + offset, "Mac: %pM",
1497                                          rulla->mac_addr);
1498                        offset += sprintf(buf + offset, " Atm:");
1499                        for (j = 0; j < ATM_ESA_LEN; j++) {
1500                                offset += sprintf(buf + offset,
1501                                                  "%2.2x ",
1502                                                  rulla->atm_addr[j] & 0xff);
1503                        }
1504                        offset += sprintf(buf + offset,
1505                                          "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1506                                          rulla->vcc ? rulla->vcc->vpi : 0,
1507                                          rulla->vcc ? rulla->vcc->vci : 0,
1508                                          rulla->recv_vcc ? rulla->recv_vcc->
1509                                          vpi : 0,
1510                                          rulla->recv_vcc ? rulla->recv_vcc->
1511                                          vci : 0, rulla->last_used,
1512                                          rulla->timestamp, rulla->no_tries);
1513                        offset +=
1514                            sprintf(buf + offset,
1515                                    "Flags:%x, Packets_flooded:%x, Status: %s ",
1516                                    rulla->flags, rulla->packets_flooded,
1517                                    get_status_string(rulla->status));
1518                        pr_info("%s\n", buf);
1519                }
1520        }
1521
1522        if (!hlist_empty(&priv->lec_no_forward))
1523                pr_info("No forward\n");
1524        hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1525                offset = 0;
1526                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1527                offset += sprintf(buf + offset, " Atm:");
1528                for (j = 0; j < ATM_ESA_LEN; j++) {
1529                        offset += sprintf(buf + offset, "%2.2x ",
1530                                          rulla->atm_addr[j] & 0xff);
1531                }
1532                offset += sprintf(buf + offset,
1533                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1534                                  rulla->vcc ? rulla->vcc->vpi : 0,
1535                                  rulla->vcc ? rulla->vcc->vci : 0,
1536                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1537                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1538                                  rulla->last_used,
1539                                  rulla->timestamp, rulla->no_tries);
1540                offset += sprintf(buf + offset,
1541                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1542                                  rulla->flags, rulla->packets_flooded,
1543                                  get_status_string(rulla->status));
1544                pr_info("%s\n", buf);
1545        }
1546
1547        if (!hlist_empty(&priv->lec_arp_empty_ones))
1548                pr_info("Empty ones\n");
1549        hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1550                offset = 0;
1551                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1552                offset += sprintf(buf + offset, " Atm:");
1553                for (j = 0; j < ATM_ESA_LEN; j++) {
1554                        offset += sprintf(buf + offset, "%2.2x ",
1555                                          rulla->atm_addr[j] & 0xff);
1556                }
1557                offset += sprintf(buf + offset,
1558                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1559                                  rulla->vcc ? rulla->vcc->vpi : 0,
1560                                  rulla->vcc ? rulla->vcc->vci : 0,
1561                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1562                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1563                                  rulla->last_used,
1564                                  rulla->timestamp, rulla->no_tries);
1565                offset += sprintf(buf + offset,
1566                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1567                                  rulla->flags, rulla->packets_flooded,
1568                                  get_status_string(rulla->status));
1569                pr_info("%s", buf);
1570        }
1571
1572        if (!hlist_empty(&priv->mcast_fwds))
1573                pr_info("Multicast Forward VCCs\n");
1574        hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1575                offset = 0;
1576                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1577                offset += sprintf(buf + offset, " Atm:");
1578                for (j = 0; j < ATM_ESA_LEN; j++) {
1579                        offset += sprintf(buf + offset, "%2.2x ",
1580                                          rulla->atm_addr[j] & 0xff);
1581                }
1582                offset += sprintf(buf + offset,
1583                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1584                                  rulla->vcc ? rulla->vcc->vpi : 0,
1585                                  rulla->vcc ? rulla->vcc->vci : 0,
1586                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1587                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1588                                  rulla->last_used,
1589                                  rulla->timestamp, rulla->no_tries);
1590                offset += sprintf(buf + offset,
1591                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
1592                                  rulla->flags, rulla->packets_flooded,
1593                                  get_status_string(rulla->status));
1594                pr_info("%s\n", buf);
1595        }
1596
1597}
1598#else
1599#define dump_arp_table(priv) do { } while (0)
1600#endif
1601
1602/*
1603 * Destruction of arp-cache
1604 */
1605static void lec_arp_destroy(struct lec_priv *priv)
1606{
1607        unsigned long flags;
1608        struct hlist_node *node, *next;
1609        struct lec_arp_table *entry;
1610        int i;
1611
1612        cancel_rearming_delayed_work(&priv->lec_arp_work);
1613
1614        /*
1615         * Remove all entries
1616         */
1617
1618        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1619        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1620                hlist_for_each_entry_safe(entry, node, next,
1621                                          &priv->lec_arp_tables[i], next) {
1622                        lec_arp_remove(priv, entry);
1623                        lec_arp_put(entry);
1624                }
1625                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1626        }
1627
1628        hlist_for_each_entry_safe(entry, node, next,
1629                                  &priv->lec_arp_empty_ones, next) {
1630                del_timer_sync(&entry->timer);
1631                lec_arp_clear_vccs(entry);
1632                hlist_del(&entry->next);
1633                lec_arp_put(entry);
1634        }
1635        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1636
1637        hlist_for_each_entry_safe(entry, node, next,
1638                                  &priv->lec_no_forward, next) {
1639                del_timer_sync(&entry->timer);
1640                lec_arp_clear_vccs(entry);
1641                hlist_del(&entry->next);
1642                lec_arp_put(entry);
1643        }
1644        INIT_HLIST_HEAD(&priv->lec_no_forward);
1645
1646        hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1647                /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1648                lec_arp_clear_vccs(entry);
1649                hlist_del(&entry->next);
1650                lec_arp_put(entry);
1651        }
1652        INIT_HLIST_HEAD(&priv->mcast_fwds);
1653        priv->mcast_vcc = NULL;
1654        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1655}
1656
1657/*
1658 * Find entry by mac_address
1659 */
1660static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1661                                          const unsigned char *mac_addr)
1662{
1663        struct hlist_node *node;
1664        struct hlist_head *head;
1665        struct lec_arp_table *entry;
1666
1667        pr_debug("%pM\n", mac_addr);
1668
1669        head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1670        hlist_for_each_entry(entry, node, head, next) {
1671                if (!compare_ether_addr(mac_addr, entry->mac_addr))
1672                        return entry;
1673        }
1674        return NULL;
1675}
1676
1677static struct lec_arp_table *make_entry(struct lec_priv *priv,
1678                                        const unsigned char *mac_addr)
1679{
1680        struct lec_arp_table *to_return;
1681
1682        to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1683        if (!to_return) {
1684                pr_info("LEC: Arp entry kmalloc failed\n");
1685                return NULL;
1686        }
1687        memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1688        INIT_HLIST_NODE(&to_return->next);
1689        setup_timer(&to_return->timer, lec_arp_expire_arp,
1690                        (unsigned long)to_return);
1691        to_return->last_used = jiffies;
1692        to_return->priv = priv;
1693        skb_queue_head_init(&to_return->tx_wait);
1694        atomic_set(&to_return->usage, 1);
1695        return to_return;
1696}
1697
1698/* Arp sent timer expired */
1699static void lec_arp_expire_arp(unsigned long data)
1700{
1701        struct lec_arp_table *entry;
1702
1703        entry = (struct lec_arp_table *)data;
1704
1705        pr_debug("\n");
1706        if (entry->status == ESI_ARP_PENDING) {
1707                if (entry->no_tries <= entry->priv->max_retry_count) {
1708                        if (entry->is_rdesc)
1709                                send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1710                                             entry->mac_addr, NULL, NULL);
1711                        else
1712                                send_to_lecd(entry->priv, l_arp_xmt,
1713                                             entry->mac_addr, NULL, NULL);
1714                        entry->no_tries++;
1715                }
1716                mod_timer(&entry->timer, jiffies + (1 * HZ));
1717        }
1718}
1719
1720/* Unknown/unused vcc expire, remove associated entry */
1721static void lec_arp_expire_vcc(unsigned long data)
1722{
1723        unsigned long flags;
1724        struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1725        struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1726
1727        del_timer(&to_remove->timer);
1728
1729        pr_debug("%p %p: vpi:%d vci:%d\n",
1730                 to_remove, priv,
1731                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1732                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1733
1734        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1735        hlist_del(&to_remove->next);
1736        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1737
1738        lec_arp_clear_vccs(to_remove);
1739        lec_arp_put(to_remove);
1740}
1741
1742static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1743                                   unsigned long now,
1744                                   struct lec_priv *priv)
1745{
1746        unsigned long time_to_check;
1747
1748        if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1749                time_to_check = priv->forward_delay_time;
1750        else
1751                time_to_check = priv->aging_time;
1752
1753        pr_debug("About to expire: %lx - %lx > %lx\n",
1754                 now, entry->last_used, time_to_check);
1755        if (time_after(now, entry->last_used + time_to_check) &&
1756            !(entry->flags & LEC_PERMANENT_FLAG) &&
1757            !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1758                /* Remove entry */
1759                pr_debug("Entry timed out\n");
1760                lec_arp_remove(priv, entry);
1761                lec_arp_put(entry);
1762        } else {
1763                /* Something else */
1764                if ((entry->status == ESI_VC_PENDING ||
1765                     entry->status == ESI_ARP_PENDING) &&
1766                    time_after_eq(now, entry->timestamp +
1767                                       priv->max_unknown_frame_time)) {
1768                        entry->timestamp = jiffies;
1769                        entry->packets_flooded = 0;
1770                        if (entry->status == ESI_VC_PENDING)
1771                                send_to_lecd(priv, l_svc_setup,
1772                                             entry->mac_addr,
1773                                             entry->atm_addr,
1774                                             NULL);
1775                }
1776                if (entry->status == ESI_FLUSH_PENDING &&
1777                    time_after_eq(now, entry->timestamp +
1778                                       priv->path_switching_delay)) {
1779                        lec_arp_hold(entry);
1780                        return true;
1781                }
1782        }
1783
1784        return false;
1785}
1786/*
1787 * Expire entries.
1788 * 1. Re-set timer
1789 * 2. For each entry, delete entries that have aged past the age limit.
1790 * 3. For each entry, depending on the status of the entry, perform
1791 *    the following maintenance.
1792 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1793 *       tick_count is above the max_unknown_frame_time, clear
1794 *       the tick_count to zero and clear the packets_flooded counter
1795 *       to zero. This supports the packet rate limit per address
1796 *       while flooding unknowns.
1797 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1798 *       than or equal to the path_switching_delay, change the status
1799 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1800 *       regardless of the progress of the flush protocol.
1801 */
1802static void lec_arp_check_expire(struct work_struct *work)
1803{
1804        unsigned long flags;
1805        struct lec_priv *priv =
1806                container_of(work, struct lec_priv, lec_arp_work.work);
1807        struct hlist_node *node, *next;
1808        struct lec_arp_table *entry;
1809        unsigned long now;
1810        int i;
1811
1812        pr_debug("%p\n", priv);
1813        now = jiffies;
1814restart:
1815        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1816        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1817                hlist_for_each_entry_safe(entry, node, next,
1818                                          &priv->lec_arp_tables[i], next) {
1819                        if (__lec_arp_check_expire(entry, now, priv)) {
1820                                struct sk_buff *skb;
1821                                struct atm_vcc *vcc = entry->vcc;
1822
1823                                spin_unlock_irqrestore(&priv->lec_arp_lock,
1824                                                       flags);
1825                                while ((skb = skb_dequeue(&entry->tx_wait)))
1826                                        lec_send(vcc, skb);
1827                                entry->last_used = jiffies;
1828                                entry->status = ESI_FORWARD_DIRECT;
1829                                lec_arp_put(entry);
1830
1831                                goto restart;
1832                        }
1833                }
1834        }
1835        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1836
1837        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1838}
1839
1840/*
1841 * Try to find vcc where mac_address is attached.
1842 *
1843 */
1844static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1845                                       const unsigned char *mac_to_find,
1846                                       int is_rdesc,
1847                                       struct lec_arp_table **ret_entry)
1848{
1849        unsigned long flags;
1850        struct lec_arp_table *entry;
1851        struct atm_vcc *found;
1852
1853        if (mac_to_find[0] & 0x01) {
1854                switch (priv->lane_version) {
1855                case 1:
1856                        return priv->mcast_vcc;
1857                case 2: /* LANE2 wants arp for multicast addresses */
1858                        if (!compare_ether_addr(mac_to_find, bus_mac))
1859                                return priv->mcast_vcc;
1860                        break;
1861                default:
1862                        break;
1863                }
1864        }
1865
1866        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1867        entry = lec_arp_find(priv, mac_to_find);
1868
1869        if (entry) {
1870                if (entry->status == ESI_FORWARD_DIRECT) {
1871                        /* Connection Ok */
1872                        entry->last_used = jiffies;
1873                        lec_arp_hold(entry);
1874                        *ret_entry = entry;
1875                        found = entry->vcc;
1876                        goto out;
1877                }
1878                /*
1879                 * If the LE_ARP cache entry is still pending, reset count to 0
1880                 * so another LE_ARP request can be made for this frame.
1881                 */
1882                if (entry->status == ESI_ARP_PENDING)
1883                        entry->no_tries = 0;
1884                /*
1885                 * Data direct VC not yet set up, check to see if the unknown
1886                 * frame count is greater than the limit. If the limit has
1887                 * not been reached, allow the caller to send packet to
1888                 * BUS.
1889                 */
1890                if (entry->status != ESI_FLUSH_PENDING &&
1891                    entry->packets_flooded <
1892                    priv->maximum_unknown_frame_count) {
1893                        entry->packets_flooded++;
1894                        pr_debug("Flooding..\n");
1895                        found = priv->mcast_vcc;
1896                        goto out;
1897                }
1898                /*
1899                 * We got here because entry->status == ESI_FLUSH_PENDING
1900                 * or BUS flood limit was reached for an entry which is
1901                 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1902                 */
1903                lec_arp_hold(entry);
1904                *ret_entry = entry;
1905                pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1906                         entry->vcc);
1907                found = NULL;
1908        } else {
1909                /* No matching entry was found */
1910                entry = make_entry(priv, mac_to_find);
1911                pr_debug("Making entry\n");
1912                if (!entry) {
1913                        found = priv->mcast_vcc;
1914                        goto out;
1915                }
1916                lec_arp_add(priv, entry);
1917                /* We want arp-request(s) to be sent */
1918                entry->packets_flooded = 1;
1919                entry->status = ESI_ARP_PENDING;
1920                entry->no_tries = 1;
1921                entry->last_used = entry->timestamp = jiffies;
1922                entry->is_rdesc = is_rdesc;
1923                if (entry->is_rdesc)
1924                        send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1925                                     NULL);
1926                else
1927                        send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1928                entry->timer.expires = jiffies + (1 * HZ);
1929                entry->timer.function = lec_arp_expire_arp;
1930                add_timer(&entry->timer);
1931                found = priv->mcast_vcc;
1932        }
1933
1934out:
1935        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1936        return found;
1937}
1938
1939static int
1940lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1941                unsigned long permanent)
1942{
1943        unsigned long flags;
1944        struct hlist_node *node, *next;
1945        struct lec_arp_table *entry;
1946        int i;
1947
1948        pr_debug("\n");
1949        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1950        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1951                hlist_for_each_entry_safe(entry, node, next,
1952                                          &priv->lec_arp_tables[i], next) {
1953                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1954                            (permanent ||
1955                             !(entry->flags & LEC_PERMANENT_FLAG))) {
1956                                lec_arp_remove(priv, entry);
1957                                lec_arp_put(entry);
1958                        }
1959                        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1960                        return 0;
1961                }
1962        }
1963        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1964        return -1;
1965}
1966
1967/*
1968 * Notifies:  Response to arp_request (atm_addr != NULL)
1969 */
1970static void
1971lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1972               const unsigned char *atm_addr, unsigned long remoteflag,
1973               unsigned int targetless_le_arp)
1974{
1975        unsigned long flags;
1976        struct hlist_node *node, *next;
1977        struct lec_arp_table *entry, *tmp;
1978        int i;
1979
1980        pr_debug("%smac:%pM\n",
1981                 (targetless_le_arp) ? "targetless " : "", mac_addr);
1982
1983        spin_lock_irqsave(&priv->lec_arp_lock, flags);
1984        entry = lec_arp_find(priv, mac_addr);
1985        if (entry == NULL && targetless_le_arp)
1986                goto out;       /*
1987                                 * LANE2: ignore targetless LE_ARPs for which
1988                                 * we have no entry in the cache. 7.1.30
1989                                 */
1990        if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1991                hlist_for_each_entry_safe(entry, node, next,
1992                                          &priv->lec_arp_empty_ones, next) {
1993                        if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1994                                hlist_del(&entry->next);
1995                                del_timer(&entry->timer);
1996                                tmp = lec_arp_find(priv, mac_addr);
1997                                if (tmp) {
1998                                        del_timer(&tmp->timer);
1999                                        tmp->status = ESI_FORWARD_DIRECT;
2000                                        memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2001                                        tmp->vcc = entry->vcc;
2002                                        tmp->old_push = entry->old_push;
2003                                        tmp->last_used = jiffies;
2004                                        del_timer(&entry->timer);
2005                                        lec_arp_put(entry);
2006                                        entry = tmp;
2007                                } else {
2008                                        entry->status = ESI_FORWARD_DIRECT;
2009                                        memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2010                                        entry->last_used = jiffies;
2011                                        lec_arp_add(priv, entry);
2012                                }
2013                                if (remoteflag)
2014                                        entry->flags |= LEC_REMOTE_FLAG;
2015                                else
2016                                        entry->flags &= ~LEC_REMOTE_FLAG;
2017                                pr_debug("After update\n");
2018                                dump_arp_table(priv);
2019                                goto out;
2020                        }
2021                }
2022        }
2023
2024        entry = lec_arp_find(priv, mac_addr);
2025        if (!entry) {
2026                entry = make_entry(priv, mac_addr);
2027                if (!entry)
2028                        goto out;
2029                entry->status = ESI_UNKNOWN;
2030                lec_arp_add(priv, entry);
2031                /* Temporary, changes before end of function */
2032        }
2033        memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2034        del_timer(&entry->timer);
2035        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2036                hlist_for_each_entry(tmp, node,
2037                                     &priv->lec_arp_tables[i], next) {
2038                        if (entry != tmp &&
2039                            !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2040                                /* Vcc to this host exists */
2041                                if (tmp->status > ESI_VC_PENDING) {
2042                                        /*
2043                                         * ESI_FLUSH_PENDING,
2044                                         * ESI_FORWARD_DIRECT
2045                                         */
2046                                        entry->vcc = tmp->vcc;
2047                                        entry->old_push = tmp->old_push;
2048                                }
2049                                entry->status = tmp->status;
2050                                break;
2051                        }
2052                }
2053        }
2054        if (remoteflag)
2055                entry->flags |= LEC_REMOTE_FLAG;
2056        else
2057                entry->flags &= ~LEC_REMOTE_FLAG;
2058        if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2059                entry->status = ESI_VC_PENDING;
2060                send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2061        }
2062        pr_debug("After update2\n");
2063        dump_arp_table(priv);
2064out:
2065        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2066}
2067
2068/*
2069 * Notifies: Vcc setup ready
2070 */
2071static void
2072lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2073              struct atm_vcc *vcc,
2074              void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2075{
2076        unsigned long flags;
2077        struct hlist_node *node;
2078        struct lec_arp_table *entry;
2079        int i, found_entry = 0;
2080
2081        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2082        /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2083        if (ioc_data->receive == 2) {
2084                pr_debug("LEC_ARP: Attaching mcast forward\n");
2085#if 0
2086                entry = lec_arp_find(priv, bus_mac);
2087                if (!entry) {
2088                        pr_info("LEC_ARP: Multicast entry not found!\n");
2089                        goto out;
2090                }
2091                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2092                entry->recv_vcc = vcc;
2093                entry->old_recv_push = old_push;
2094#endif
2095                entry = make_entry(priv, bus_mac);
2096                if (entry == NULL)
2097                        goto out;
2098                del_timer(&entry->timer);
2099                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2100                entry->recv_vcc = vcc;
2101                entry->old_recv_push = old_push;
2102                hlist_add_head(&entry->next, &priv->mcast_fwds);
2103                goto out;
2104        } else if (ioc_data->receive == 1) {
2105                /*
2106                 * Vcc which we don't want to make default vcc,
2107                 * attach it anyway.
2108                 */
2109                pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2110                         ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2111                         ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2112                         ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2113                         ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2114                         ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2115                         ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2116                         ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2117                         ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2118                         ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2119                         ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2120                entry = make_entry(priv, bus_mac);
2121                if (entry == NULL)
2122                        goto out;
2123                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2124                memset(entry->mac_addr, 0, ETH_ALEN);
2125                entry->recv_vcc = vcc;
2126                entry->old_recv_push = old_push;
2127                entry->status = ESI_UNKNOWN;
2128                entry->timer.expires = jiffies + priv->vcc_timeout_period;
2129                entry->timer.function = lec_arp_expire_vcc;
2130                hlist_add_head(&entry->next, &priv->lec_no_forward);
2131                add_timer(&entry->timer);
2132                dump_arp_table(priv);
2133                goto out;
2134        }
2135        pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2136                 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2137                 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2138                 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2139                 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2140                 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2141                 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2142                 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2143                 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2144                 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2145                 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2146        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2147                hlist_for_each_entry(entry, node,
2148                                     &priv->lec_arp_tables[i], next) {
2149                        if (memcmp
2150                            (ioc_data->atm_addr, entry->atm_addr,
2151                             ATM_ESA_LEN) == 0) {
2152                                pr_debug("LEC_ARP: Attaching data direct\n");
2153                                pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2154                                         entry->vcc ? entry->vcc->vci : 0,
2155                                         entry->recv_vcc ? entry->recv_vcc->
2156                                         vci : 0);
2157                                found_entry = 1;
2158                                del_timer(&entry->timer);
2159                                entry->vcc = vcc;
2160                                entry->old_push = old_push;
2161                                if (entry->status == ESI_VC_PENDING) {
2162                                        if (priv->maximum_unknown_frame_count
2163                                            == 0)
2164                                                entry->status =
2165                                                    ESI_FORWARD_DIRECT;
2166                                        else {
2167                                                entry->timestamp = jiffies;
2168                                                entry->status =
2169                                                    ESI_FLUSH_PENDING;
2170#if 0
2171                                                send_to_lecd(priv, l_flush_xmt,
2172                                                             NULL,
2173                                                             entry->atm_addr,
2174                                                             NULL);
2175#endif
2176                                        }
2177                                } else {
2178                                        /*
2179                                         * They were forming a connection
2180                                         * to us, and we to them. Our
2181                                         * ATM address is numerically lower
2182                                         * than theirs, so we make connection
2183                                         * we formed into default VCC (8.1.11).
2184                                         * Connection they made gets torn
2185                                         * down. This might confuse some
2186                                         * clients. Can be changed if
2187                                         * someone reports trouble...
2188                                         */
2189                                        ;
2190                                }
2191                        }
2192                }
2193        }
2194        if (found_entry) {
2195                pr_debug("After vcc was added\n");
2196                dump_arp_table(priv);
2197                goto out;
2198        }
2199        /*
2200         * Not found, snatch address from first data packet that arrives
2201         * from this vcc
2202         */
2203        entry = make_entry(priv, bus_mac);
2204        if (!entry)
2205                goto out;
2206        entry->vcc = vcc;
2207        entry->old_push = old_push;
2208        memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2209        memset(entry->mac_addr, 0, ETH_ALEN);
2210        entry->status = ESI_UNKNOWN;
2211        hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2212        entry->timer.expires = jiffies + priv->vcc_timeout_period;
2213        entry->timer.function = lec_arp_expire_vcc;
2214        add_timer(&entry->timer);
2215        pr_debug("After vcc was added\n");
2216        dump_arp_table(priv);
2217out:
2218        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2219}
2220
2221static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2222{
2223        unsigned long flags;
2224        struct hlist_node *node;
2225        struct lec_arp_table *entry;
2226        int i;
2227
2228        pr_debug("%lx\n", tran_id);
2229restart:
2230        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2231        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2232                hlist_for_each_entry(entry, node,
2233                                     &priv->lec_arp_tables[i], next) {
2234                        if (entry->flush_tran_id == tran_id &&
2235                            entry->status == ESI_FLUSH_PENDING) {
2236                                struct sk_buff *skb;
2237                                struct atm_vcc *vcc = entry->vcc;
2238
2239                                lec_arp_hold(entry);
2240                                spin_unlock_irqrestore(&priv->lec_arp_lock,
2241                                                       flags);
2242                                while ((skb = skb_dequeue(&entry->tx_wait)))
2243                                        lec_send(vcc, skb);
2244                                entry->last_used = jiffies;
2245                                entry->status = ESI_FORWARD_DIRECT;
2246                                lec_arp_put(entry);
2247                                pr_debug("LEC_ARP: Flushed\n");
2248                                goto restart;
2249                        }
2250                }
2251        }
2252        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2253        dump_arp_table(priv);
2254}
2255
2256static void
2257lec_set_flush_tran_id(struct lec_priv *priv,
2258                      const unsigned char *atm_addr, unsigned long tran_id)
2259{
2260        unsigned long flags;
2261        struct hlist_node *node;
2262        struct lec_arp_table *entry;
2263        int i;
2264
2265        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2266        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2267                hlist_for_each_entry(entry, node,
2268                                     &priv->lec_arp_tables[i], next) {
2269                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2270                                entry->flush_tran_id = tran_id;
2271                                pr_debug("Set flush transaction id to %lx for %p\n",
2272                                         tran_id, entry);
2273                        }
2274                }
2275        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2276}
2277
2278static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2279{
2280        unsigned long flags;
2281        unsigned char mac_addr[] = {
2282                0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2283        };
2284        struct lec_arp_table *to_add;
2285        struct lec_vcc_priv *vpriv;
2286        int err = 0;
2287
2288        vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2289        if (!vpriv)
2290                return -ENOMEM;
2291        vpriv->xoff = 0;
2292        vpriv->old_pop = vcc->pop;
2293        vcc->user_back = vpriv;
2294        vcc->pop = lec_pop;
2295        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2296        to_add = make_entry(priv, mac_addr);
2297        if (!to_add) {
2298                vcc->pop = vpriv->old_pop;
2299                kfree(vpriv);
2300                err = -ENOMEM;
2301                goto out;
2302        }
2303        memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2304        to_add->status = ESI_FORWARD_DIRECT;
2305        to_add->flags |= LEC_PERMANENT_FLAG;
2306        to_add->vcc = vcc;
2307        to_add->old_push = vcc->push;
2308        vcc->push = lec_push;
2309        priv->mcast_vcc = vcc;
2310        lec_arp_add(priv, to_add);
2311out:
2312        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2313        return err;
2314}
2315
2316static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2317{
2318        unsigned long flags;
2319        struct hlist_node *node, *next;
2320        struct lec_arp_table *entry;
2321        int i;
2322
2323        pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2324        dump_arp_table(priv);
2325
2326        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2327
2328        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2329                hlist_for_each_entry_safe(entry, node, next,
2330                                          &priv->lec_arp_tables[i], next) {
2331                        if (vcc == entry->vcc) {
2332                                lec_arp_remove(priv, entry);
2333                                lec_arp_put(entry);
2334                                if (priv->mcast_vcc == vcc)
2335                                        priv->mcast_vcc = NULL;
2336                        }
2337                }
2338        }
2339
2340        hlist_for_each_entry_safe(entry, node, next,
2341                                  &priv->lec_arp_empty_ones, next) {
2342                if (entry->vcc == vcc) {
2343                        lec_arp_clear_vccs(entry);
2344                        del_timer(&entry->timer);
2345                        hlist_del(&entry->next);
2346                        lec_arp_put(entry);
2347                }
2348        }
2349
2350        hlist_for_each_entry_safe(entry, node, next,
2351                                  &priv->lec_no_forward, next) {
2352                if (entry->recv_vcc == vcc) {
2353                        lec_arp_clear_vccs(entry);
2354                        del_timer(&entry->timer);
2355                        hlist_del(&entry->next);
2356                        lec_arp_put(entry);
2357                }
2358        }
2359
2360        hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2361                if (entry->recv_vcc == vcc) {
2362                        lec_arp_clear_vccs(entry);
2363                        /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2364                        hlist_del(&entry->next);
2365                        lec_arp_put(entry);
2366                }
2367        }
2368
2369        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2370        dump_arp_table(priv);
2371}
2372
2373static void
2374lec_arp_check_empties(struct lec_priv *priv,
2375                      struct atm_vcc *vcc, struct sk_buff *skb)
2376{
2377        unsigned long flags;
2378        struct hlist_node *node, *next;
2379        struct lec_arp_table *entry, *tmp;
2380        struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2381        unsigned char *src;
2382#ifdef CONFIG_TR
2383        struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2384
2385        if (priv->is_trdev)
2386                src = tr_hdr->h_source;
2387        else
2388#endif
2389                src = hdr->h_source;
2390
2391        spin_lock_irqsave(&priv->lec_arp_lock, flags);
2392        hlist_for_each_entry_safe(entry, node, next,
2393                                  &priv->lec_arp_empty_ones, next) {
2394                if (vcc == entry->vcc) {
2395                        del_timer(&entry->timer);
2396                        memcpy(entry->mac_addr, src, ETH_ALEN);
2397                        entry->status = ESI_FORWARD_DIRECT;
2398                        entry->last_used = jiffies;
2399                        /* We might have got an entry */
2400                        tmp = lec_arp_find(priv, src);
2401                        if (tmp) {
2402                                lec_arp_remove(priv, tmp);
2403                                lec_arp_put(tmp);
2404                        }
2405                        hlist_del(&entry->next);
2406                        lec_arp_add(priv, entry);
2407                        goto out;
2408                }
2409        }
2410        pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2411out:
2412        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2413}
2414
2415MODULE_LICENSE("GPL");
2416
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