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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
  42 static 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
  64 static int lec_open(struct net_device *dev);
  65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  66                                   struct net_device *dev);
  67 static int lec_close(struct net_device *dev);
  68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  69                                           const unsigned char *mac_addr);
  70 static int lec_arp_remove(struct lec_priv *priv,
  71                           struct lec_arp_table *to_remove);
  72 /* LANE2 functions */
  73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  74                                 const u8 *tlvs, u32 sizeoftlvs);
  75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  76                          u8 **tlvs, u32 *sizeoftlvs);
  77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  78                                const u8 *tlvs, u32 sizeoftlvs);
  79
  80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  81                            unsigned long permanent);
  82 static void lec_arp_check_empties(struct lec_priv *priv,
  83                                   struct atm_vcc *vcc, struct sk_buff *skb);
  84 static void lec_arp_destroy(struct lec_priv *priv);
  85 static void lec_arp_init(struct lec_priv *priv);
  86 static 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);
  90 static 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);
  94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  96 static void lec_set_flush_tran_id(struct lec_priv *priv,
  97                                   const unsigned char *atm_addr,
  98                                   unsigned long tran_id);
  99 static 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));
 104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 105
 106 /* must be done under lec_arp_lock */
 107 static inline void lec_arp_hold(struct lec_arp_table *entry)
 108 {
 109         atomic_inc(&entry->usage);
 110 }
 111
 112 static inline void lec_arp_put(struct lec_arp_table *entry)
 113 {
 114         if (atomic_dec_and_test(&entry->usage))
 115                 kfree(entry);
 116 }
 117
 118 static 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
 124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 125
 126 /* Device structures */
 127 static struct net_device *dev_lec[MAX_LEC_ITF];
 128
 129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 130 static 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         return;
 166 }
 167 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 168
 169 /*
 170  * Modelled after tr_type_trans
 171  * All multicast and ARE or STE frames go to BUS.
 172  * Non source routed frames go by destination address.
 173  * Last hop source routed frames go by destination address.
 174  * Not last hop source routed frames go by _next_ route descriptor.
 175  * Returns pointer to destination MAC address or fills in rdesc
 176  * and returns NULL.
 177  */
 178 #ifdef CONFIG_TR
 179 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 180 {
 181         struct trh_hdr *trh;
 182         unsigned int riflen, num_rdsc;
 183
 184         trh = (struct trh_hdr *)packet;
 185         if (trh->daddr[0] & (uint8_t) 0x80)
 186                 return bus_mac; /* multicast */
 187
 188         if (trh->saddr[0] & TR_RII) {
 189                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 190                 if ((ntohs(trh->rcf) >> 13) != 0)
 191                         return bus_mac; /* ARE or STE */
 192         } else
 193                 return trh->daddr;      /* not source routed */
 194
 195         if (riflen < 6)
 196                 return trh->daddr;      /* last hop, source routed */
 197
 198         /* riflen is 6 or more, packet has more than one route descriptor */
 199         num_rdsc = (riflen / 2) - 1;
 200         memset(rdesc, 0, ETH_ALEN);
 201         /* offset 4 comes from LAN destination field in LE control frames */
 202         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 203                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 204         else {
 205                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 206                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 207         }
 208
 209         return NULL;
 210 }
 211 #endif /* CONFIG_TR */
 212
 213 /*
 214  * Open/initialize the netdevice. This is called (in the current kernel)
 215  * sometime after booting when the 'ifconfig' program is run.
 216  *
 217  * This routine should set everything up anew at each open, even
 218  * registers that "should" only need to be set once at boot, so that
 219  * there is non-reboot way to recover if something goes wrong.
 220  */
 221
 222 static int lec_open(struct net_device *dev)
 223 {
 224         netif_start_queue(dev);
 225         memset(&dev->stats, 0, sizeof(struct net_device_stats));
 226
 227         return 0;
 228 }
 229
 230 static void
 231 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 232 {
 233         struct net_device *dev = skb->dev;
 234
 235         ATM_SKB(skb)->vcc = vcc;
 236         ATM_SKB(skb)->atm_options = vcc->atm_options;
 237
 238         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 239         if (vcc->send(vcc, skb) < 0) {
 240                 dev->stats.tx_dropped++;
 241                 return;
 242         }
 243
 244         dev->stats.tx_packets++;
 245         dev->stats.tx_bytes += skb->len;
 246 }
 247
 248 static void lec_tx_timeout(struct net_device *dev)
 249 {
 250         pr_info("%s\n", dev->name);
 251         dev->trans_start = jiffies;
 252         netif_wake_queue(dev);
 253 }
 254
 255 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 256                                   struct net_device *dev)
 257 {
 258         struct sk_buff *skb2;
 259         struct lec_priv *priv = netdev_priv(dev);
 260         struct lecdatahdr_8023 *lec_h;
 261         struct atm_vcc *vcc;
 262         struct lec_arp_table *entry;
 263         unsigned char *dst;
 264         int min_frame_size;
 265 #ifdef CONFIG_TR
 266         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 267 #endif
 268         int is_rdesc;
 269
 270         pr_debug("called\n");
 271         if (!priv->lecd) {
 272                 pr_info("%s:No lecd attached\n", dev->name);
 273                 dev->stats.tx_errors++;
 274                 netif_stop_queue(dev);
 275                 kfree_skb(skb);
 276                 return NETDEV_TX_OK;
 277         }
 278
 279         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 280                  (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 281                  (long)skb_end_pointer(skb));
 282 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 283         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 284                 lec_handle_bridge(skb, dev);
 285 #endif
 286
 287         /* Make sure we have room for lec_id */
 288         if (skb_headroom(skb) < 2) {
 289                 pr_debug("reallocating skb\n");
 290                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 291                 kfree_skb(skb);
 292                 if (skb2 == NULL)
 293                         return NETDEV_TX_OK;
 294                 skb = skb2;
 295         }
 296         skb_push(skb, 2);
 297
 298         /* Put le header to place, works for TokenRing too */
 299         lec_h = (struct lecdatahdr_8023 *)skb->data;
 300         lec_h->le_header = htons(priv->lecid);
 301
 302 #ifdef CONFIG_TR
 303         /*
 304          * Ugly. Use this to realign Token Ring packets for
 305          * e.g. PCA-200E driver.
 306          */
 307         if (priv->is_trdev) {
 308                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 309                 kfree_skb(skb);
 310                 if (skb2 == NULL)
 311                         return NETDEV_TX_OK;
 312                 skb = skb2;
 313         }
 314 #endif
 315
 316 #if DUMP_PACKETS >= 2
 317 #define MAX_DUMP_SKB 99
 318 #elif DUMP_PACKETS >= 1
 319 #define MAX_DUMP_SKB 30
 320 #endif
 321 #if DUMP_PACKETS >= 1
 322         printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
 323                dev->name, skb->len, priv->lecid);
 324         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 325                        skb->data, min(skb->len, MAX_DUMP_SKB), true);
 326 #endif /* DUMP_PACKETS >= 1 */
 327
 328         /* Minimum ethernet-frame size */
 329 #ifdef CONFIG_TR
 330         if (priv->is_trdev)
 331                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 332         else
 333 #endif
 334                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 335         if (skb->len < min_frame_size) {
 336                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 337                         skb2 = skb_copy_expand(skb, 0,
 338                                                min_frame_size - skb->truesize,
 339                                                GFP_ATOMIC);
 340                         dev_kfree_skb(skb);
 341                         if (skb2 == NULL) {
 342                                 dev->stats.tx_dropped++;
 343                                 return NETDEV_TX_OK;
 344                         }
 345                         skb = skb2;
 346                 }
 347                 skb_put(skb, min_frame_size - skb->len);
 348         }
 349
 350         /* Send to right vcc */
 351         is_rdesc = 0;
 352         dst = lec_h->h_dest;
 353 #ifdef CONFIG_TR
 354         if (priv->is_trdev) {
 355                 dst = get_tr_dst(skb->data + 2, rdesc);
 356                 if (dst == NULL) {
 357                         dst = rdesc;
 358                         is_rdesc = 1;
 359                 }
 360         }
 361 #endif
 362         entry = NULL;
 363         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 364         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
 365                  dev->name, vcc, vcc ? vcc->flags : 0, entry);
 366         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 367                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 368                         pr_debug("%s:queuing packet, MAC address %pM\n",
 369                                  dev->name, lec_h->h_dest);
 370                         skb_queue_tail(&entry->tx_wait, skb);
 371                 } else {
 372                         pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
 373                                  dev->name, lec_h->h_dest);
 374                         dev->stats.tx_dropped++;
 375                         dev_kfree_skb(skb);
 376                 }
 377                 goto out;
 378         }
 379 #if DUMP_PACKETS > 0
 380         printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
 381                dev->name, vcc->vpi, vcc->vci);
 382 #endif /* DUMP_PACKETS > 0 */
 383
 384         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 385                 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
 386                 lec_send(vcc, skb2);
 387         }
 388
 389         lec_send(vcc, skb);
 390
 391         if (!atm_may_send(vcc, 0)) {
 392                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 393
 394                 vpriv->xoff = 1;
 395                 netif_stop_queue(dev);
 396
 397                 /*
 398                  * vcc->pop() might have occurred in between, making
 399                  * the vcc usuable again.  Since xmit is serialized,
 400                  * this is the only situation we have to re-test.
 401                  */
 402
 403                 if (atm_may_send(vcc, 0))
 404                         netif_wake_queue(dev);
 405         }
 406
 407 out:
 408         if (entry)
 409                 lec_arp_put(entry);
 410         dev->trans_start = jiffies;
 411         return NETDEV_TX_OK;
 412 }
 413
 414 /* The inverse routine to net_open(). */
 415 static int lec_close(struct net_device *dev)
 416 {
 417         netif_stop_queue(dev);
 418         return 0;
 419 }
 420
 421 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 422 {
 423         unsigned long flags;
 424         struct net_device *dev = (struct net_device *)vcc->proto_data;
 425         struct lec_priv *priv = netdev_priv(dev);
 426         struct atmlec_msg *mesg;
 427         struct lec_arp_table *entry;
 428         int i;
 429         char *tmp;              /* FIXME */
 430
 431         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 432         mesg = (struct atmlec_msg *)skb->data;
 433         tmp = skb->data;
 434         tmp += sizeof(struct atmlec_msg);
 435         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 436         switch (mesg->type) {
 437         case l_set_mac_addr:
 438                 for (i = 0; i < 6; i++)
 439                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 440                 break;
 441         case l_del_mac_addr:
 442                 for (i = 0; i < 6; i++)
 443                         dev->dev_addr[i] = 0;
 444                 break;
 445         case l_addr_delete:
 446                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 447                                 mesg->content.normal.flag);
 448                 break;
 449         case l_topology_change:
 450                 priv->topology_change = mesg->content.normal.flag;
 451                 break;
 452         case l_flush_complete:
 453                 lec_flush_complete(priv, mesg->content.normal.flag);
 454                 break;
 455         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 456                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 457                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 458                 lec_arp_remove(priv, entry);
 459                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 460
 461                 if (mesg->content.normal.no_source_le_narp)
 462                         break;
 463                 /* FALL THROUGH */
 464         case l_arp_update:
 465                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 466                                mesg->content.normal.atm_addr,
 467                                mesg->content.normal.flag,
 468                                mesg->content.normal.targetless_le_arp);
 469                 pr_debug("in l_arp_update\n");
 470                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 471                         pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
 472                                  mesg->sizeoftlvs);
 473                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 474                                             tmp, mesg->sizeoftlvs);
 475                 }
 476                 break;
 477         case l_config:
 478                 priv->maximum_unknown_frame_count =
 479                     mesg->content.config.maximum_unknown_frame_count;
 480                 priv->max_unknown_frame_time =
 481                     (mesg->content.config.max_unknown_frame_time * HZ);
 482                 priv->max_retry_count = mesg->content.config.max_retry_count;
 483                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 484                 priv->forward_delay_time =
 485                     (mesg->content.config.forward_delay_time * HZ);
 486                 priv->arp_response_time =
 487                     (mesg->content.config.arp_response_time * HZ);
 488                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 489                 priv->path_switching_delay =
 490                     (mesg->content.config.path_switching_delay * HZ);
 491                 priv->lane_version = mesg->content.config.lane_version;
 492                                         /* LANE2 */
 493                 priv->lane2_ops = NULL;
 494                 if (priv->lane_version > 1)
 495                         priv->lane2_ops = &lane2_ops;
 496                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 497                         pr_info("%s: change_mtu to %d failed\n",
 498                                 dev->name, mesg->content.config.mtu);
 499                 priv->is_proxy = mesg->content.config.is_proxy;
 500                 break;
 501         case l_flush_tran_id:
 502                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 503                                       mesg->content.normal.flag);
 504                 break;
 505         case l_set_lecid:
 506                 priv->lecid =
 507                     (unsigned short)(0xffff & mesg->content.normal.flag);
 508                 break;
 509         case l_should_bridge:
 510 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 511         {
 512                 pr_debug("%s: bridge zeppelin asks about %pM\n",
 513                          dev->name, mesg->content.proxy.mac_addr);
 514
 515                 if (br_fdb_test_addr_hook == NULL)
 516                         break;
 517
 518                 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
 519                         /* hit from bridge table, send LE_ARP_RESPONSE */
 520                         struct sk_buff *skb2;
 521                         struct sock *sk;
 522
 523                         pr_debug("%s: entry found, responding to zeppelin\n",
 524                                  dev->name);
 525                         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 526                         if (skb2 == NULL)
 527                                 break;
 528                         skb2->len = sizeof(struct atmlec_msg);
 529                         skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
 530                         atm_force_charge(priv->lecd, skb2->truesize);
 531                         sk = sk_atm(priv->lecd);
 532                         skb_queue_tail(&sk->sk_receive_queue, skb2);
 533                         sk->sk_data_ready(sk, skb2->len);
 534                 }
 535         }
 536 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 537                 break;
 538         default:
 539                 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
 540                 dev_kfree_skb(skb);
 541                 return -EINVAL;
 542         }
 543         dev_kfree_skb(skb);
 544         return 0;
 545 }
 546
 547 static void lec_atm_close(struct atm_vcc *vcc)
 548 {
 549         struct sk_buff *skb;
 550         struct net_device *dev = (struct net_device *)vcc->proto_data;
 551         struct lec_priv *priv = netdev_priv(dev);
 552
 553         priv->lecd = NULL;
 554         /* Do something needful? */
 555
 556         netif_stop_queue(dev);
 557         lec_arp_destroy(priv);
 558
 559         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 560                 pr_info("%s closing with messages pending\n", dev->name);
 561         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 562                 atm_return(vcc, skb->truesize);
 563                 dev_kfree_skb(skb);
 564         }
 565
 566         pr_info("%s: Shut down!\n", dev->name);
 567         module_put(THIS_MODULE);
 568 }
 569
 570 static struct atmdev_ops lecdev_ops = {
 571         .close = lec_atm_close,
 572         .send = lec_atm_send
 573 };
 574
 575 static struct atm_dev lecatm_dev = {
 576         .ops = &lecdev_ops,
 577         .type = "lec",
 578         .number = 999,          /* dummy device number */
 579         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 580 };
 581
 582 /*
 583  * LANE2: new argument struct sk_buff *data contains
 584  * the LE_ARP based TLVs introduced in the LANE2 spec
 585  */
 586 static int
 587 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 588              const unsigned char *mac_addr, const unsigned char *atm_addr,
 589              struct sk_buff *data)
 590 {
 591         struct sock *sk;
 592         struct sk_buff *skb;
 593         struct atmlec_msg *mesg;
 594
 595         if (!priv || !priv->lecd)
 596                 return -1;
 597         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 598         if (!skb)
 599                 return -1;
 600         skb->len = sizeof(struct atmlec_msg);
 601         mesg = (struct atmlec_msg *)skb->data;
 602         memset(mesg, 0, sizeof(struct atmlec_msg));
 603         mesg->type = type;
 604         if (data != NULL)
 605                 mesg->sizeoftlvs = data->len;
 606         if (mac_addr)
 607                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 608         else
 609                 mesg->content.normal.targetless_le_arp = 1;
 610         if (atm_addr)
 611                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 612
 613         atm_force_charge(priv->lecd, skb->truesize);
 614         sk = sk_atm(priv->lecd);
 615         skb_queue_tail(&sk->sk_receive_queue, skb);
 616         sk->sk_data_ready(sk, skb->len);
 617
 618         if (data != NULL) {
 619                 pr_debug("about to send %d bytes of data\n", data->len);
 620                 atm_force_charge(priv->lecd, data->truesize);
 621                 skb_queue_tail(&sk->sk_receive_queue, data);
 622                 sk->sk_data_ready(sk, skb->len);
 623         }
 624
 625         return 0;
 626 }
 627
 628 /* shamelessly stolen from drivers/net/net_init.c */
 629 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 630 {
 631         if ((new_mtu < 68) || (new_mtu > 18190))
 632                 return -EINVAL;
 633         dev->mtu = new_mtu;
 634         return 0;
 635 }
 636
 637 static void lec_set_multicast_list(struct net_device *dev)
 638 {
 639         /*
 640          * by default, all multicast frames arrive over the bus.
 641          * eventually support selective multicast service
 642          */
 643         return;
 644 }
 645
 646 static const struct net_device_ops lec_netdev_ops = {
 647         .ndo_open               = lec_open,
 648         .ndo_stop               = lec_close,
 649         .ndo_start_xmit         = lec_start_xmit,
 650         .ndo_change_mtu         = lec_change_mtu,
 651         .ndo_tx_timeout         = lec_tx_timeout,
 652         .ndo_set_multicast_list = lec_set_multicast_list,
 653 };
 654
 655 static const unsigned char lec_ctrl_magic[] = {
 656         0xff,
 657         0x00,
 658         0x01,
 659         0x01
 660 };
 661
 662 #define LEC_DATA_DIRECT_8023  2
 663 #define LEC_DATA_DIRECT_8025  3
 664
 665 static int lec_is_data_direct(struct atm_vcc *vcc)
 666 {
 667         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 668                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 669 }
 670
 671 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 672 {
 673         unsigned long flags;
 674         struct net_device *dev = (struct net_device *)vcc->proto_data;
 675         struct lec_priv *priv = netdev_priv(dev);
 676
 677 #if DUMP_PACKETS > 0
 678         printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
 679                dev->name, vcc->vpi, vcc->vci);
 680 #endif
 681         if (!skb) {
 682                 pr_debug("%s: null skb\n", dev->name);
 683                 lec_vcc_close(priv, vcc);
 684                 return;
 685         }
 686 #if DUMP_PACKETS >= 2
 687 #define MAX_SKB_DUMP 99
 688 #elif DUMP_PACKETS >= 1
 689 #define MAX_SKB_DUMP 30
 690 #endif
 691 #if DUMP_PACKETS > 0
 692         printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
 693                dev->name, skb->len, priv->lecid);
 694         print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
 695                        skb->data, min(MAX_SKB_DUMP, skb->len), true);
 696 #endif /* DUMP_PACKETS > 0 */
 697         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
 698                                 /* Control frame, to daemon */
 699                 struct sock *sk = sk_atm(vcc);
 700
 701                 pr_debug("%s: To daemon\n", dev->name);
 702                 skb_queue_tail(&sk->sk_receive_queue, skb);
 703                 sk->sk_data_ready(sk, skb->len);
 704         } else {                /* Data frame, queue to protocol handlers */
 705                 struct lec_arp_table *entry;
 706                 unsigned char *src, *dst;
 707
 708                 atm_return(vcc, skb->truesize);
 709                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 710                     !priv->lecd || !(dev->flags & IFF_UP)) {
 711                         /*
 712                          * Probably looping back, or if lecd is missing,
 713                          * lecd has gone down
 714                          */
 715                         pr_debug("Ignoring frame...\n");
 716                         dev_kfree_skb(skb);
 717                         return;
 718                 }
 719 #ifdef CONFIG_TR
 720                 if (priv->is_trdev)
 721                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 722                 else
 723 #endif
 724                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 725
 726                 /*
 727                  * If this is a Data Direct VCC, and the VCC does not match
 728                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 729                  */
 730                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 731                 if (lec_is_data_direct(vcc)) {
 732 #ifdef CONFIG_TR
 733                         if (priv->is_trdev)
 734                                 src =
 735                                     ((struct lecdatahdr_8025 *)skb->data)->
 736                                     h_source;
 737                         else
 738 #endif
 739                                 src =
 740                                     ((struct lecdatahdr_8023 *)skb->data)->
 741                                     h_source;
 742                         entry = lec_arp_find(priv, src);
 743                         if (entry && entry->vcc != vcc) {
 744                                 lec_arp_remove(priv, entry);
 745                                 lec_arp_put(entry);
 746                         }
 747                 }
 748                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 749
 750                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 751                     !priv->is_proxy &&  /* Proxy wants all the packets */
 752                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 753                         dev_kfree_skb(skb);
 754                         return;
 755                 }
 756                 if (!hlist_empty(&priv->lec_arp_empty_ones))
 757                         lec_arp_check_empties(priv, vcc, skb);
 758                 skb_pull(skb, 2);       /* skip lec_id */
 759 #ifdef CONFIG_TR
 760                 if (priv->is_trdev)
 761                         skb->protocol = tr_type_trans(skb, dev);
 762                 else
 763 #endif
 764                         skb->protocol = eth_type_trans(skb, dev);
 765                 dev->stats.rx_packets++;
 766                 dev->stats.rx_bytes += skb->len;
 767                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 768                 netif_rx(skb);
 769         }
 770 }
 771
 772 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 773 {
 774         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 775         struct net_device *dev = skb->dev;
 776
 777         if (vpriv == NULL) {
 778                 pr_info("vpriv = NULL!?!?!?\n");
 779                 return;
 780         }
 781
 782         vpriv->old_pop(vcc, skb);
 783
 784         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 785                 vpriv->xoff = 0;
 786                 if (netif_running(dev) && netif_queue_stopped(dev))
 787                         netif_wake_queue(dev);
 788         }
 789 }
 790
 791 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 792 {
 793         struct lec_vcc_priv *vpriv;
 794         int bytes_left;
 795         struct atmlec_ioc ioc_data;
 796
 797         /* Lecd must be up in this case */
 798         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 799         if (bytes_left != 0)
 800                 pr_info("copy from user failed for %d bytes\n", bytes_left);
 801         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 802             !dev_lec[ioc_data.dev_num])
 803                 return -EINVAL;
 804         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 805         if (!vpriv)
 806                 return -ENOMEM;
 807         vpriv->xoff = 0;
 808         vpriv->old_pop = vcc->pop;
 809         vcc->user_back = vpriv;
 810         vcc->pop = lec_pop;
 811         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 812                       &ioc_data, vcc, vcc->push);
 813         vcc->proto_data = dev_lec[ioc_data.dev_num];
 814         vcc->push = lec_push;
 815         return 0;
 816 }
 817
 818 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 819 {
 820         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 821                 return -EINVAL;
 822         vcc->proto_data = dev_lec[arg];
 823         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 824                                 vcc);
 825 }
 826
 827 /* Initialize device. */
 828 static int lecd_attach(struct atm_vcc *vcc, int arg)
 829 {
 830         int i;
 831         struct lec_priv *priv;
 832
 833         if (arg < 0)
 834                 i = 0;
 835         else
 836                 i = arg;
 837 #ifdef CONFIG_TR
 838         if (arg >= MAX_LEC_ITF)
 839                 return -EINVAL;
 840 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 841         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 842                 return -EINVAL;
 843 #endif
 844         if (!dev_lec[i]) {
 845                 int is_trdev, size;
 846
 847                 is_trdev = 0;
 848                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 849                         is_trdev = 1;
 850
 851                 size = sizeof(struct lec_priv);
 852 #ifdef CONFIG_TR
 853                 if (is_trdev)
 854                         dev_lec[i] = alloc_trdev(size);
 855                 else
 856 #endif
 857                         dev_lec[i] = alloc_etherdev(size);
 858                 if (!dev_lec[i])
 859                         return -ENOMEM;
 860                 dev_lec[i]->netdev_ops = &lec_netdev_ops;
 861                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 862                 if (register_netdev(dev_lec[i])) {
 863                         free_netdev(dev_lec[i]);
 864                         return -EINVAL;
 865                 }
 866
 867                 priv = netdev_priv(dev_lec[i]);
 868                 priv->is_trdev = is_trdev;
 869         } else {
 870                 priv = netdev_priv(dev_lec[i]);
 871                 if (priv->lecd)
 872                         return -EADDRINUSE;
 873         }
 874         lec_arp_init(priv);
 875         priv->itfnum = i;       /* LANE2 addition */
 876         priv->lecd = vcc;
 877         vcc->dev = &lecatm_dev;
 878         vcc_insert_socket(sk_atm(vcc));
 879
 880         vcc->proto_data = dev_lec[i];
 881         set_bit(ATM_VF_META, &vcc->flags);
 882         set_bit(ATM_VF_READY, &vcc->flags);
 883
 884         /* Set default values to these variables */
 885         priv->maximum_unknown_frame_count = 1;
 886         priv->max_unknown_frame_time = (1 * HZ);
 887         priv->vcc_timeout_period = (1200 * HZ);
 888         priv->max_retry_count = 1;
 889         priv->aging_time = (300 * HZ);
 890         priv->forward_delay_time = (15 * HZ);
 891         priv->topology_change = 0;
 892         priv->arp_response_time = (1 * HZ);
 893         priv->flush_timeout = (4 * HZ);
 894         priv->path_switching_delay = (6 * HZ);
 895
 896         if (dev_lec[i]->flags & IFF_UP)
 897                 netif_start_queue(dev_lec[i]);
 898         __module_get(THIS_MODULE);
 899         return i;
 900 }
 901
 902 #ifdef CONFIG_PROC_FS
 903 static const char *lec_arp_get_status_string(unsigned char status)
 904 {
 905         static const char *const lec_arp_status_string[] = {
 906                 "ESI_UNKNOWN       ",
 907                 "ESI_ARP_PENDING   ",
 908                 "ESI_VC_PENDING    ",
 909                 "<Undefined>       ",
 910                 "ESI_FLUSH_PENDING ",
 911                 "ESI_FORWARD_DIRECT"
 912         };
 913
 914         if (status > ESI_FORWARD_DIRECT)
 915                 status = 3;     /* ESI_UNDEFINED */
 916         return lec_arp_status_string[status];
 917 }
 918
 919 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 920 {
 921         int i;
 922
 923         for (i = 0; i < ETH_ALEN; i++)
 924                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 925         seq_printf(seq, " ");
 926         for (i = 0; i < ATM_ESA_LEN; i++)
 927                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 928         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 929                    entry->flags & 0xffff);
 930         if (entry->vcc)
 931                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 932         else
 933                 seq_printf(seq, "        ");
 934         if (entry->recv_vcc) {
 935                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 936                            entry->recv_vcc->vci);
 937         }
 938         seq_putc(seq, '\n');
 939 }
 940
 941 struct lec_state {
 942         unsigned long flags;
 943         struct lec_priv *locked;
 944         struct hlist_node *node;
 945         struct net_device *dev;
 946         int itf;
 947         int arp_table;
 948         int misc_table;
 949 };
 950
 951 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 952                           loff_t *l)
 953 {
 954         struct hlist_node *e = state->node;
 955         struct lec_arp_table *tmp;
 956
 957         if (!e)
 958                 e = tbl->first;
 959         if (e == SEQ_START_TOKEN) {
 960                 e = tbl->first;
 961                 --*l;
 962         }
 963
 964         hlist_for_each_entry_from(tmp, e, next) {
 965                 if (--*l < 0)
 966                         break;
 967         }
 968         state->node = e;
 969
 970         return (*l < 0) ? state : NULL;
 971 }
 972
 973 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
 974                           struct lec_priv *priv)
 975 {
 976         void *v = NULL;
 977         int p;
 978
 979         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
 980                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
 981                 if (v)
 982                         break;
 983         }
 984         state->arp_table = p;
 985         return v;
 986 }
 987
 988 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
 989                            struct lec_priv *priv)
 990 {
 991         struct hlist_head *lec_misc_tables[] = {
 992                 &priv->lec_arp_empty_ones,
 993                 &priv->lec_no_forward,
 994                 &priv->mcast_fwds
 995         };
 996         void *v = NULL;
 997         int q;
 998
 999         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1000                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1001                 if (v)
1002                         break;
1003         }
1004         state->misc_table = q;
1005         return v;
1006 }
1007
1008 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1009                            struct lec_priv *priv)
1010 {
1011         if (!state->locked) {
1012                 state->locked = priv;
1013                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1014         }
1015         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1016                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1017                 state->locked = NULL;
1018                 /* Partial state reset for the next time we get called */
1019                 state->arp_table = state->misc_table = 0;
1020         }
1021         return state->locked;
1022 }
1023
1024 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1025 {
1026         struct net_device *dev;
1027         void *v;
1028
1029         dev = state->dev ? state->dev : dev_lec[state->itf];
1030         v = (dev && netdev_priv(dev)) ?
1031                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1032         if (!v && dev) {
1033                 dev_put(dev);
1034                 /* Partial state reset for the next time we get called */
1035                 dev = NULL;
1036         }
1037         state->dev = dev;
1038         return v;
1039 }
1040
1041 static void *lec_get_idx(struct lec_state *state, loff_t l)
1042 {
1043         void *v = NULL;
1044
1045         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1046                 v = lec_itf_walk(state, &l);
1047                 if (v)
1048                         break;
1049         }
1050         return v;
1051 }
1052
1053 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1054 {
1055         struct lec_state *state = seq->private;
1056
1057         state->itf = 0;
1058         state->dev = NULL;
1059         state->locked = NULL;
1060         state->arp_table = 0;
1061         state->misc_table = 0;
1062         state->node = SEQ_START_TOKEN;
1063
1064         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1065 }
1066
1067 static void lec_seq_stop(struct seq_file *seq, void *v)
1068 {
1069         struct lec_state *state = seq->private;
1070
1071         if (state->dev) {
1072                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1073                                        state->flags);
1074                 dev_put(state->dev);
1075         }
1076 }
1077
1078 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1079 {
1080         struct lec_state *state = seq->private;
1081
1082         v = lec_get_idx(state, 1);
1083         *pos += !!PTR_ERR(v);
1084         return v;
1085 }
1086
1087 static int lec_seq_show(struct seq_file *seq, void *v)
1088 {
1089         static const char lec_banner[] =
1090             "Itf  MAC          ATM destination"
1091             "                          Status            Flags "
1092             "VPI/VCI Recv VPI/VCI\n";
1093
1094         if (v == SEQ_START_TOKEN)
1095                 seq_puts(seq, lec_banner);
1096         else {
1097                 struct lec_state *state = seq->private;
1098                 struct net_device *dev = state->dev;
1099                 struct lec_arp_table *entry = hlist_entry(state->node,
1100                                                           struct lec_arp_table,
1101                                                           next);
1102
1103                 seq_printf(seq, "%s ", dev->name);
1104                 lec_info(seq, entry);
1105         }
1106         return 0;
1107 }
1108
1109 static const struct seq_operations lec_seq_ops = {
1110         .start = lec_seq_start,
1111         .next = lec_seq_next,
1112         .stop = lec_seq_stop,
1113         .show = lec_seq_show,
1114 };
1115
1116 static int lec_seq_open(struct inode *inode, struct file *file)
1117 {
1118         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1119 }
1120
1121 static const struct file_operations lec_seq_fops = {
1122         .owner = THIS_MODULE,
1123         .open = lec_seq_open,
1124         .read = seq_read,
1125         .llseek = seq_lseek,
1126         .release = seq_release_private,
1127 };
1128 #endif
1129
1130 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1131 {
1132         struct atm_vcc *vcc = ATM_SD(sock);
1133         int err = 0;
1134
1135         switch (cmd) {
1136         case ATMLEC_CTRL:
1137         case ATMLEC_MCAST:
1138         case ATMLEC_DATA:
1139                 if (!capable(CAP_NET_ADMIN))
1140                         return -EPERM;
1141                 break;
1142         default:
1143                 return -ENOIOCTLCMD;
1144         }
1145
1146         switch (cmd) {
1147         case ATMLEC_CTRL:
1148                 err = lecd_attach(vcc, (int)arg);
1149                 if (err >= 0)
1150                         sock->state = SS_CONNECTED;
1151                 break;
1152         case ATMLEC_MCAST:
1153                 err = lec_mcast_attach(vcc, (int)arg);
1154                 break;
1155         case ATMLEC_DATA:
1156                 err = lec_vcc_attach(vcc, (void __user *)arg);
1157                 break;
1158         }
1159
1160         return err;
1161 }
1162
1163 static struct atm_ioctl lane_ioctl_ops = {
1164         .owner = THIS_MODULE,
1165         .ioctl = lane_ioctl,
1166 };
1167
1168 static int __init lane_module_init(void)
1169 {
1170 #ifdef CONFIG_PROC_FS
1171         struct proc_dir_entry *p;
1172
1173         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1174         if (!p) {
1175                 pr_err("Unable to initialize /proc/net/atm/lec\n");
1176                 return -ENOMEM;
1177         }
1178 #endif
1179
1180         register_atm_ioctl(&lane_ioctl_ops);
1181         pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1182         return 0;
1183 }
1184
1185 static void __exit lane_module_cleanup(void)
1186 {
1187         int i;
1188         struct lec_priv *priv;
1189
1190         remove_proc_entry("lec", atm_proc_root);
1191
1192         deregister_atm_ioctl(&lane_ioctl_ops);
1193
1194         for (i = 0; i < MAX_LEC_ITF; i++) {
1195                 if (dev_lec[i] != NULL) {
1196                         priv = netdev_priv(dev_lec[i]);
1197                         unregister_netdev(dev_lec[i]);
1198                         free_netdev(dev_lec[i]);
1199                         dev_lec[i] = NULL;
1200                 }
1201         }
1202
1203         return;
1204 }
1205
1206 module_init(lane_module_init);
1207 module_exit(lane_module_cleanup);
1208
1209 /*
1210  * LANE2: 3.1.3, LE_RESOLVE.request
1211  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1212  * If sizeoftlvs == NULL the default TLVs associated with with this
1213  * lec will be used.
1214  * If dst_mac == NULL, targetless LE_ARP will be sent
1215  */
1216 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1217                          u8 **tlvs, u32 *sizeoftlvs)
1218 {
1219         unsigned long flags;
1220         struct lec_priv *priv = netdev_priv(dev);
1221         struct lec_arp_table *table;
1222         struct sk_buff *skb;
1223         int retval;
1224
1225         if (force == 0) {
1226                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1227                 table = lec_arp_find(priv, dst_mac);
1228                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1229                 if (table == NULL)
1230                         return -1;
1231
1232                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1233                 if (*tlvs == NULL)
1234                         return -1;
1235
1236                 *sizeoftlvs = table->sizeoftlvs;
1237
1238                 return 0;
1239         }
1240
1241         if (sizeoftlvs == NULL)
1242                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1243
1244         else {
1245                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1246                 if (skb == NULL)
1247                         return -1;
1248                 skb->len = *sizeoftlvs;
1249                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1250                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1251         }
1252         return retval;
1253 }
1254
1255 /*
1256  * LANE2: 3.1.4, LE_ASSOCIATE.request
1257  * Associate the *tlvs with the *lan_dst address.
1258  * Will overwrite any previous association
1259  * Returns 1 for success, 0 for failure (out of memory)
1260  *
1261  */
1262 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1263                                const u8 *tlvs, u32 sizeoftlvs)
1264 {
1265         int retval;
1266         struct sk_buff *skb;
1267         struct lec_priv *priv = netdev_priv(dev);
1268
1269         if (compare_ether_addr(lan_dst, dev->dev_addr))
1270                 return 0;       /* not our mac address */
1271
1272         kfree(priv->tlvs);      /* NULL if there was no previous association */
1273
1274         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1275         if (priv->tlvs == NULL)
1276                 return 0;
1277         priv->sizeoftlvs = sizeoftlvs;
1278
1279         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1280         if (skb == NULL)
1281                 return 0;
1282         skb->len = sizeoftlvs;
1283         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1284         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1285         if (retval != 0)
1286                 pr_info("lec.c: lane2_associate_req() failed\n");
1287         /*
1288          * If the previous association has changed we must
1289          * somehow notify other LANE entities about the change
1290          */
1291         return 1;
1292 }
1293
1294 /*
1295  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1296  *
1297  */
1298 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1299                                 const u8 *tlvs, u32 sizeoftlvs)
1300 {
1301 #if 0
1302         int i = 0;
1303 #endif
1304         struct lec_priv *priv = netdev_priv(dev);
1305 #if 0                           /*
1306                                  * Why have the TLVs in LE_ARP entries
1307                                  * since we do not use them? When you
1308                                  * uncomment this code, make sure the
1309                                  * TLVs get freed when entry is killed
1310                                  */
1311         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1312
1313         if (entry == NULL)
1314                 return;         /* should not happen */
1315
1316         kfree(entry->tlvs);
1317
1318         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1319         if (entry->tlvs == NULL)
1320                 return;
1321         entry->sizeoftlvs = sizeoftlvs;
1322 #endif
1323 #if 0
1324         pr_info("\n");
1325         pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1326         while (i < sizeoftlvs)
1327                 pr_cont("%02x ", tlvs[i++]);
1328
1329         pr_cont("\n");
1330 #endif
1331
1332         /* tell MPOA about the TLVs we saw */
1333         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1334                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1335                                                      tlvs, sizeoftlvs);
1336         }
1337         return;
1338 }
1339
1340 /*
1341  * Here starts what used to lec_arpc.c
1342  *
1343  * lec_arpc.c was added here when making
1344  * lane client modular. October 1997
1345  */
1346
1347 #include <linux/types.h>
1348 #include <linux/timer.h>
1349 #include <linux/param.h>
1350 #include <asm/atomic.h>
1351 #include <linux/inetdevice.h>
1352 #include <net/route.h>
1353
1354 #if 0
1355 #define pr_debug(format, args...)
1356 /*
1357   #define pr_debug printk
1358 */
1359 #endif
1360 #define DEBUG_ARP_TABLE 0
1361
1362 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1363
1364 static void lec_arp_check_expire(struct work_struct *work);
1365 static void lec_arp_expire_arp(unsigned long data);
1366
1367 /*
1368  * Arp table funcs
1369  */
1370
1371 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1372
1373 /*
1374  * Initialization of arp-cache
1375  */
1376 static void lec_arp_init(struct lec_priv *priv)
1377 {
1378         unsigned short i;
1379
1380         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1381                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1382         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1383         INIT_HLIST_HEAD(&priv->lec_no_forward);
1384         INIT_HLIST_HEAD(&priv->mcast_fwds);
1385         spin_lock_init(&priv->lec_arp_lock);
1386         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1387         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1388 }
1389
1390 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1391 {
1392         if (entry->vcc) {
1393                 struct atm_vcc *vcc = entry->vcc;
1394                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1395                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1396
1397                 vcc->pop = vpriv->old_pop;
1398                 if (vpriv->xoff)
1399                         netif_wake_queue(dev);
1400                 kfree(vpriv);
1401                 vcc->user_back = NULL;
1402                 vcc->push = entry->old_push;
1403                 vcc_release_async(vcc, -EPIPE);
1404                 entry->vcc = NULL;
1405         }
1406         if (entry->recv_vcc) {
1407                 entry->recv_vcc->push = entry->old_recv_push;
1408                 vcc_release_async(entry->recv_vcc, -EPIPE);
1409                 entry->recv_vcc = NULL;
1410         }
1411 }
1412
1413 /*
1414  * Insert entry to lec_arp_table
1415  * LANE2: Add to the end of the list to satisfy 8.1.13
1416  */
1417 static inline void
1418 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1419 {
1420         struct hlist_head *tmp;
1421
1422         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1423         hlist_add_head(&entry->next, tmp);
1424
1425         pr_debug("Added entry:%pM\n", entry->mac_addr);
1426 }
1427
1428 /*
1429  * Remove entry from lec_arp_table
1430  */
1431 static int
1432 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1433 {
1434         struct hlist_node *node;
1435         struct lec_arp_table *entry;
1436         int i, remove_vcc = 1;
1437
1438         if (!to_remove)
1439                 return -1;
1440
1441         hlist_del(&to_remove->next);
1442         del_timer(&to_remove->timer);
1443
1444         /*
1445          * If this is the only MAC connected to this VCC,
1446          * also tear down the VCC
1447          */
1448         if (to_remove->status >= ESI_FLUSH_PENDING) {
1449                 /*
1450                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1451                  */
1452                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1453                         hlist_for_each_entry(entry, node,
1454                                              &priv->lec_arp_tables[i], next) {
1455                                 if (memcmp(to_remove->atm_addr,
1456                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1457                                         remove_vcc = 0;
1458                                         break;
1459                                 }
1460                         }
1461                 }
1462                 if (remove_vcc)
1463                         lec_arp_clear_vccs(to_remove);
1464         }
1465         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1466
1467         pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1468         return 0;
1469 }
1470
1471 #if DEBUG_ARP_TABLE
1472 static const char *get_status_string(unsigned char st)
1473 {
1474         switch (st) {
1475         case ESI_UNKNOWN:
1476                 return "ESI_UNKNOWN";
1477         case ESI_ARP_PENDING:
1478                 return "ESI_ARP_PENDING";
1479         case ESI_VC_PENDING:
1480                 return "ESI_VC_PENDING";
1481         case ESI_FLUSH_PENDING:
1482                 return "ESI_FLUSH_PENDING";
1483         case ESI_FORWARD_DIRECT:
1484                 return "ESI_FORWARD_DIRECT";
1485         }
1486         return "<UNKNOWN>";
1487 }
1488
1489 static void dump_arp_table(struct lec_priv *priv)
1490 {
1491         struct hlist_node *node;
1492         struct lec_arp_table *rulla;
1493         char buf[256];
1494         int i, j, offset;
1495
1496         pr_info("Dump %p:\n", priv);
1497         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1498                 hlist_for_each_entry(rulla, node,
1499                                      &priv->lec_arp_tables[i], next) {
1500                         offset = 0;
1501                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1502                         offset += sprintf(buf + offset, "Mac: %pM",
1503                                           rulla->mac_addr);
1504                         offset += sprintf(buf + offset, " Atm:");
1505                         for (j = 0; j < ATM_ESA_LEN; j++) {
1506                                 offset += sprintf(buf + offset,
1507                                                   "%2.2x ",
1508                                                   rulla->atm_addr[j] & 0xff);
1509                         }
1510                         offset += sprintf(buf + offset,
1511                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1512                                           rulla->vcc ? rulla->vcc->vpi : 0,
1513                                           rulla->vcc ? rulla->vcc->vci : 0,
1514                                           rulla->recv_vcc ? rulla->recv_vcc->
1515                                           vpi : 0,
1516                                           rulla->recv_vcc ? rulla->recv_vcc->
1517                                           vci : 0, rulla->last_used,
1518                                           rulla->timestamp, rulla->no_tries);
1519                         offset +=
1520                             sprintf(buf + offset,
1521                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1522                                     rulla->flags, rulla->packets_flooded,
1523                                     get_status_string(rulla->status));
1524                         pr_info("%s\n", buf);
1525                 }
1526         }
1527
1528         if (!hlist_empty(&priv->lec_no_forward))
1529                 pr_info("No forward\n");
1530         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1531                 offset = 0;
1532                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1533                 offset += sprintf(buf + offset, " Atm:");
1534                 for (j = 0; j < ATM_ESA_LEN; j++) {
1535                         offset += sprintf(buf + offset, "%2.2x ",
1536                                           rulla->atm_addr[j] & 0xff);
1537                 }
1538                 offset += sprintf(buf + offset,
1539                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1540                                   rulla->vcc ? rulla->vcc->vpi : 0,
1541                                   rulla->vcc ? rulla->vcc->vci : 0,
1542                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1543                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1544                                   rulla->last_used,
1545                                   rulla->timestamp, rulla->no_tries);
1546                 offset += sprintf(buf + offset,
1547                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1548                                   rulla->flags, rulla->packets_flooded,
1549                                   get_status_string(rulla->status));
1550                 pr_info("%s\n", buf);
1551         }
1552
1553         if (!hlist_empty(&priv->lec_arp_empty_ones))
1554                 pr_info("Empty ones\n");
1555         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1556                 offset = 0;
1557                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1558                 offset += sprintf(buf + offset, " Atm:");
1559                 for (j = 0; j < ATM_ESA_LEN; j++) {
1560                         offset += sprintf(buf + offset, "%2.2x ",
1561                                           rulla->atm_addr[j] & 0xff);
1562                 }
1563                 offset += sprintf(buf + offset,
1564                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1565                                   rulla->vcc ? rulla->vcc->vpi : 0,
1566                                   rulla->vcc ? rulla->vcc->vci : 0,
1567                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1568                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1569                                   rulla->last_used,
1570                                   rulla->timestamp, rulla->no_tries);
1571                 offset += sprintf(buf + offset,
1572                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1573                                   rulla->flags, rulla->packets_flooded,
1574                                   get_status_string(rulla->status));
1575                 pr_info("%s", buf);
1576         }
1577
1578         if (!hlist_empty(&priv->mcast_fwds))
1579                 pr_info("Multicast Forward VCCs\n");
1580         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1581                 offset = 0;
1582                 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1583                 offset += sprintf(buf + offset, " Atm:");
1584                 for (j = 0; j < ATM_ESA_LEN; j++) {
1585                         offset += sprintf(buf + offset, "%2.2x ",
1586                                           rulla->atm_addr[j] & 0xff);
1587                 }
1588                 offset += sprintf(buf + offset,
1589                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1590                                   rulla->vcc ? rulla->vcc->vpi : 0,
1591                                   rulla->vcc ? rulla->vcc->vci : 0,
1592                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1593                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1594                                   rulla->last_used,
1595                                   rulla->timestamp, rulla->no_tries);
1596                 offset += sprintf(buf + offset,
1597                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1598                                   rulla->flags, rulla->packets_flooded,
1599                                   get_status_string(rulla->status));
1600                 pr_info("%s\n", buf);
1601         }
1602
1603 }
1604 #else
1605 #define dump_arp_table(priv) do { } while (0)
1606 #endif
1607
1608 /*
1609  * Destruction of arp-cache
1610  */
1611 static void lec_arp_destroy(struct lec_priv *priv)
1612 {
1613         unsigned long flags;
1614         struct hlist_node *node, *next;
1615         struct lec_arp_table *entry;
1616         int i;
1617
1618         cancel_rearming_delayed_work(&priv->lec_arp_work);
1619
1620         /*
1621          * Remove all entries
1622          */
1623
1624         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1625         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1626                 hlist_for_each_entry_safe(entry, node, next,
1627                                           &priv->lec_arp_tables[i], next) {
1628                         lec_arp_remove(priv, entry);
1629                         lec_arp_put(entry);
1630                 }
1631                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1632         }
1633
1634         hlist_for_each_entry_safe(entry, node, next,
1635                                   &priv->lec_arp_empty_ones, next) {
1636                 del_timer_sync(&entry->timer);
1637                 lec_arp_clear_vccs(entry);
1638                 hlist_del(&entry->next);
1639                 lec_arp_put(entry);
1640         }
1641         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1642
1643         hlist_for_each_entry_safe(entry, node, next,
1644                                   &priv->lec_no_forward, next) {
1645                 del_timer_sync(&entry->timer);
1646                 lec_arp_clear_vccs(entry);
1647                 hlist_del(&entry->next);
1648                 lec_arp_put(entry);
1649         }
1650         INIT_HLIST_HEAD(&priv->lec_no_forward);
1651
1652         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1653                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1654                 lec_arp_clear_vccs(entry);
1655                 hlist_del(&entry->next);
1656                 lec_arp_put(entry);
1657         }
1658         INIT_HLIST_HEAD(&priv->mcast_fwds);
1659         priv->mcast_vcc = NULL;
1660         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1661 }
1662
1663 /*
1664  * Find entry by mac_address
1665  */
1666 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1667                                           const unsigned char *mac_addr)
1668 {
1669         struct hlist_node *node;
1670         struct hlist_head *head;
1671         struct lec_arp_table *entry;
1672
1673         pr_debug("%pM\n", mac_addr);
1674
1675         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1676         hlist_for_each_entry(entry, node, head, next) {
1677                 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1678                         return entry;
1679         }
1680         return NULL;
1681 }
1682
1683 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1684                                         const unsigned char *mac_addr)
1685 {
1686         struct lec_arp_table *to_return;
1687
1688         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1689         if (!to_return) {
1690                 pr_info("LEC: Arp entry kmalloc failed\n");
1691                 return NULL;
1692         }
1693         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1694         INIT_HLIST_NODE(&to_return->next);
1695         setup_timer(&to_return->timer, lec_arp_expire_arp,
1696                         (unsigned long)to_return);
1697         to_return->last_used = jiffies;
1698         to_return->priv = priv;
1699         skb_queue_head_init(&to_return->tx_wait);
1700         atomic_set(&to_return->usage, 1);
1701         return to_return;
1702 }
1703
1704 /* Arp sent timer expired */
1705 static void lec_arp_expire_arp(unsigned long data)
1706 {
1707         struct lec_arp_table *entry;
1708
1709         entry = (struct lec_arp_table *)data;
1710
1711         pr_debug("\n");
1712         if (entry->status == ESI_ARP_PENDING) {
1713                 if (entry->no_tries <= entry->priv->max_retry_count) {
1714                         if (entry->is_rdesc)
1715                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1716                                              entry->mac_addr, NULL, NULL);
1717                         else
1718                                 send_to_lecd(entry->priv, l_arp_xmt,
1719                                              entry->mac_addr, NULL, NULL);
1720                         entry->no_tries++;
1721                 }
1722                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1723         }
1724 }
1725
1726 /* Unknown/unused vcc expire, remove associated entry */
1727 static void lec_arp_expire_vcc(unsigned long data)
1728 {
1729         unsigned long flags;
1730         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1731         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1732
1733         del_timer(&to_remove->timer);
1734
1735         pr_debug("%p %p: vpi:%d vci:%d\n",
1736                  to_remove, priv,
1737                  to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1738                  to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1739
1740         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1741         hlist_del(&to_remove->next);
1742         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1743
1744         lec_arp_clear_vccs(to_remove);
1745         lec_arp_put(to_remove);
1746 }
1747
1748 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1749                                    unsigned long now,
1750                                    struct lec_priv *priv)
1751 {
1752         unsigned long time_to_check;
1753
1754         if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1755                 time_to_check = priv->forward_delay_time;
1756         else
1757                 time_to_check = priv->aging_time;
1758
1759         pr_debug("About to expire: %lx - %lx > %lx\n",
1760                  now, entry->last_used, time_to_check);
1761         if (time_after(now, entry->last_used + time_to_check) &&
1762             !(entry->flags & LEC_PERMANENT_FLAG) &&
1763             !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
1764                 /* Remove entry */
1765                 pr_debug("Entry timed out\n");
1766                 lec_arp_remove(priv, entry);
1767                 lec_arp_put(entry);
1768         } else {
1769                 /* Something else */
1770                 if ((entry->status == ESI_VC_PENDING ||
1771                      entry->status == ESI_ARP_PENDING) &&
1772                     time_after_eq(now, entry->timestamp +
1773                                        priv->max_unknown_frame_time)) {
1774                         entry->timestamp = jiffies;
1775                         entry->packets_flooded = 0;
1776                         if (entry->status == ESI_VC_PENDING)
1777                                 send_to_lecd(priv, l_svc_setup,
1778                                              entry->mac_addr,
1779                                              entry->atm_addr,
1780                                              NULL);
1781                 }
1782                 if (entry->status == ESI_FLUSH_PENDING &&
1783                     time_after_eq(now, entry->timestamp +
1784                                        priv->path_switching_delay)) {
1785                         lec_arp_hold(entry);
1786                         return true;
1787                 }
1788         }
1789
1790         return false;
1791 }
1792 /*
1793  * Expire entries.
1794  * 1. Re-set timer
1795  * 2. For each entry, delete entries that have aged past the age limit.
1796  * 3. For each entry, depending on the status of the entry, perform
1797  *    the following maintenance.
1798  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1799  *       tick_count is above the max_unknown_frame_time, clear
1800  *       the tick_count to zero and clear the packets_flooded counter
1801  *       to zero. This supports the packet rate limit per address
1802  *       while flooding unknowns.
1803  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1804  *       than or equal to the path_switching_delay, change the status
1805  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1806  *       regardless of the progress of the flush protocol.
1807  */
1808 static void lec_arp_check_expire(struct work_struct *work)
1809 {
1810         unsigned long flags;
1811         struct lec_priv *priv =
1812                 container_of(work, struct lec_priv, lec_arp_work.work);
1813         struct hlist_node *node, *next;
1814         struct lec_arp_table *entry;
1815         unsigned long now;
1816         int i;
1817
1818         pr_debug("%p\n", priv);
1819         now = jiffies;
1820 restart:
1821         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1822         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1823                 hlist_for_each_entry_safe(entry, node, next,
1824                                           &priv->lec_arp_tables[i], next) {
1825                         if (__lec_arp_check_expire(entry, now, priv)) {
1826                                 struct sk_buff *skb;
1827                                 struct atm_vcc *vcc = entry->vcc;
1828
1829                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1830                                                        flags);
1831                                 while ((skb = skb_dequeue(&entry->tx_wait)))
1832                                         lec_send(vcc, skb);
1833                                 entry->last_used = jiffies;
1834                                 entry->status = ESI_FORWARD_DIRECT;
1835                                 lec_arp_put(entry);
1836
1837                                 goto restart;
1838                         }
1839                 }
1840         }
1841         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1842
1843         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1844 }
1845
1846 /*
1847  * Try to find vcc where mac_address is attached.
1848  *
1849  */
1850 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1851                                        const unsigned char *mac_to_find,
1852                                        int is_rdesc,
1853                                        struct lec_arp_table **ret_entry)
1854 {
1855         unsigned long flags;
1856         struct lec_arp_table *entry;
1857         struct atm_vcc *found;
1858
1859         if (mac_to_find[0] & 0x01) {
1860                 switch (priv->lane_version) {
1861                 case 1:
1862                         return priv->mcast_vcc;
1863                 case 2: /* LANE2 wants arp for multicast addresses */
1864                         if (!compare_ether_addr(mac_to_find, bus_mac))
1865                                 return priv->mcast_vcc;
1866                         break;
1867                 default:
1868                         break;
1869                 }
1870         }
1871
1872         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1873         entry = lec_arp_find(priv, mac_to_find);
1874
1875         if (entry) {
1876                 if (entry->status == ESI_FORWARD_DIRECT) {
1877                         /* Connection Ok */
1878                         entry->last_used = jiffies;
1879                         lec_arp_hold(entry);
1880                         *ret_entry = entry;
1881                         found = entry->vcc;
1882                         goto out;
1883                 }
1884                 /*
1885                  * If the LE_ARP cache entry is still pending, reset count to 0
1886                  * so another LE_ARP request can be made for this frame.
1887                  */
1888                 if (entry->status == ESI_ARP_PENDING)
1889                         entry->no_tries = 0;
1890                 /*
1891                  * Data direct VC not yet set up, check to see if the unknown
1892                  * frame count is greater than the limit. If the limit has
1893                  * not been reached, allow the caller to send packet to
1894                  * BUS.
1895                  */
1896                 if (entry->status != ESI_FLUSH_PENDING &&
1897                     entry->packets_flooded <
1898                     priv->maximum_unknown_frame_count) {
1899                         entry->packets_flooded++;
1900                         pr_debug("Flooding..\n");
1901                         found = priv->mcast_vcc;
1902                         goto out;
1903                 }
1904                 /*
1905                  * We got here because entry->status == ESI_FLUSH_PENDING
1906                  * or BUS flood limit was reached for an entry which is
1907                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1908                  */
1909                 lec_arp_hold(entry);
1910                 *ret_entry = entry;
1911                 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1912                          entry->vcc);
1913                 found = NULL;
1914         } else {
1915                 /* No matching entry was found */
1916                 entry = make_entry(priv, mac_to_find);
1917                 pr_debug("Making entry\n");
1918                 if (!entry) {
1919                         found = priv->mcast_vcc;
1920                         goto out;
1921                 }
1922                 lec_arp_add(priv, entry);
1923                 /* We want arp-request(s) to be sent */
1924                 entry->packets_flooded = 1;
1925                 entry->status = ESI_ARP_PENDING;
1926                 entry->no_tries = 1;
1927                 entry->last_used = entry->timestamp = jiffies;
1928                 entry->is_rdesc = is_rdesc;
1929                 if (entry->is_rdesc)
1930                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1931                                      NULL);
1932                 else
1933                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1934                 entry->timer.expires = jiffies + (1 * HZ);
1935                 entry->timer.function = lec_arp_expire_arp;
1936                 add_timer(&entry->timer);
1937                 found = priv->mcast_vcc;
1938         }
1939
1940 out:
1941         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1942         return found;
1943 }
1944
1945 static int
1946 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1947                 unsigned long permanent)
1948 {
1949         unsigned long flags;
1950         struct hlist_node *node, *next;
1951         struct lec_arp_table *entry;
1952         int i;
1953
1954         pr_debug("\n");
1955         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1956         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1957                 hlist_for_each_entry_safe(entry, node, next,
1958                                           &priv->lec_arp_tables[i], next) {
1959                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1960                             (permanent ||
1961                              !(entry->flags & LEC_PERMANENT_FLAG))) {
1962                                 lec_arp_remove(priv, entry);
1963                                 lec_arp_put(entry);
1964                         }
1965                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1966                         return 0;
1967                 }
1968         }
1969         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1970         return -1;
1971 }
1972
1973 /*
1974  * Notifies:  Response to arp_request (atm_addr != NULL)
1975  */
1976 static void
1977 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1978                const unsigned char *atm_addr, unsigned long remoteflag,
1979                unsigned int targetless_le_arp)
1980 {
1981         unsigned long flags;
1982         struct hlist_node *node, *next;
1983         struct lec_arp_table *entry, *tmp;
1984         int i;
1985
1986         pr_debug("%smac:%pM\n",
1987                  (targetless_le_arp) ? "targetless " : "", mac_addr);
1988
1989         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1990         entry = lec_arp_find(priv, mac_addr);
1991         if (entry == NULL && targetless_le_arp)
1992                 goto out;       /*
1993                                  * LANE2: ignore targetless LE_ARPs for which
1994                                  * we have no entry in the cache. 7.1.30
1995                                  */
1996         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1997                 hlist_for_each_entry_safe(entry, node, next,
1998                                           &priv->lec_arp_empty_ones, next) {
1999                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2000                                 hlist_del(&entry->next);
2001                                 del_timer(&entry->timer);
2002                                 tmp = lec_arp_find(priv, mac_addr);
2003                                 if (tmp) {
2004                                         del_timer(&tmp->timer);
2005                                         tmp->status = ESI_FORWARD_DIRECT;
2006                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2007                                         tmp->vcc = entry->vcc;
2008                                         tmp->old_push = entry->old_push;
2009                                         tmp->last_used = jiffies;
2010                                         del_timer(&entry->timer);
2011                                         lec_arp_put(entry);
2012                                         entry = tmp;
2013                                 } else {
2014                                         entry->status = ESI_FORWARD_DIRECT;
2015                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2016                                         entry->last_used = jiffies;
2017                                         lec_arp_add(priv, entry);
2018                                 }
2019                                 if (remoteflag)
2020                                         entry->flags |= LEC_REMOTE_FLAG;
2021                                 else
2022                                         entry->flags &= ~LEC_REMOTE_FLAG;
2023                                 pr_debug("After update\n");
2024                                 dump_arp_table(priv);
2025                                 goto out;
2026                         }
2027                 }
2028         }
2029
2030         entry = lec_arp_find(priv, mac_addr);
2031         if (!entry) {
2032                 entry = make_entry(priv, mac_addr);
2033                 if (!entry)
2034                         goto out;
2035                 entry->status = ESI_UNKNOWN;
2036                 lec_arp_add(priv, entry);
2037                 /* Temporary, changes before end of function */
2038         }
2039         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2040         del_timer(&entry->timer);
2041         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2042                 hlist_for_each_entry(tmp, node,
2043                                      &priv->lec_arp_tables[i], next) {
2044                         if (entry != tmp &&
2045                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2046                                 /* Vcc to this host exists */
2047                                 if (tmp->status > ESI_VC_PENDING) {
2048                                         /*
2049                                          * ESI_FLUSH_PENDING,
2050                                          * ESI_FORWARD_DIRECT
2051                                          */
2052                                         entry->vcc = tmp->vcc;
2053                                         entry->old_push = tmp->old_push;
2054                                 }
2055                                 entry->status = tmp->status;
2056                                 break;
2057                         }
2058                 }
2059         }
2060         if (remoteflag)
2061                 entry->flags |= LEC_REMOTE_FLAG;
2062         else
2063                 entry->flags &= ~LEC_REMOTE_FLAG;
2064         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2065                 entry->status = ESI_VC_PENDING;
2066                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2067         }
2068         pr_debug("After update2\n");
2069         dump_arp_table(priv);
2070 out:
2071         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2072 }
2073
2074 /*
2075  * Notifies: Vcc setup ready
2076  */
2077 static void
2078 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2079               struct atm_vcc *vcc,
2080               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2081 {
2082         unsigned long flags;
2083         struct hlist_node *node;
2084         struct lec_arp_table *entry;
2085         int i, found_entry = 0;
2086
2087         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2088         /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2089         if (ioc_data->receive == 2) {
2090                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2091 #if 0
2092                 entry = lec_arp_find(priv, bus_mac);
2093                 if (!entry) {
2094                         pr_info("LEC_ARP: Multicast entry not found!\n");
2095                         goto out;
2096                 }
2097                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2098                 entry->recv_vcc = vcc;
2099                 entry->old_recv_push = old_push;
2100 #endif
2101                 entry = make_entry(priv, bus_mac);
2102                 if (entry == NULL)
2103                         goto out;
2104                 del_timer(&entry->timer);
2105                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2106                 entry->recv_vcc = vcc;
2107                 entry->old_recv_push = old_push;
2108                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2109                 goto out;
2110         } else if (ioc_data->receive == 1) {
2111                 /*
2112                  * Vcc which we don't want to make default vcc,
2113                  * attach it anyway.
2114                  */
2115                 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",
2116                          ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2117                          ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2118                          ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2119                          ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2120                          ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2121                          ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2122                          ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2123                          ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2124                          ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2125                          ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2126                 entry = make_entry(priv, bus_mac);
2127                 if (entry == NULL)
2128                         goto out;
2129                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2130                 memset(entry->mac_addr, 0, ETH_ALEN);
2131                 entry->recv_vcc = vcc;
2132                 entry->old_recv_push = old_push;
2133                 entry->status = ESI_UNKNOWN;
2134                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2135                 entry->timer.function = lec_arp_expire_vcc;
2136                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2137                 add_timer(&entry->timer);
2138                 dump_arp_table(priv);
2139                 goto out;
2140         }
2141         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",
2142                  ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2143                  ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2144                  ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2145                  ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2146                  ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2147                  ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2148                  ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2149                  ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2150                  ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2151                  ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2152         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2153                 hlist_for_each_entry(entry, node,
2154                                      &priv->lec_arp_tables[i], next) {
2155                         if (memcmp
2156                             (ioc_data->atm_addr, entry->atm_addr,
2157                              ATM_ESA_LEN) == 0) {
2158                                 pr_debug("LEC_ARP: Attaching data direct\n");
2159                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2160                                          entry->vcc ? entry->vcc->vci : 0,
2161                                          entry->recv_vcc ? entry->recv_vcc->
2162                                          vci : 0);
2163                                 found_entry = 1;
2164                                 del_timer(&entry->timer);
2165                                 entry->vcc = vcc;
2166                                 entry->old_push = old_push;
2167                                 if (entry->status == ESI_VC_PENDING) {
2168                                         if (priv->maximum_unknown_frame_count
2169                                             == 0)
2170                                                 entry->status =
2171                                                     ESI_FORWARD_DIRECT;
2172                                         else {
2173                                                 entry->timestamp = jiffies;
2174                                                 entry->status =
2175                                                     ESI_FLUSH_PENDING;
2176 #if 0
2177                                                 send_to_lecd(priv, l_flush_xmt,
2178                                                              NULL,
2179                                                              entry->atm_addr,
2180                                                              NULL);
2181 #endif
2182                                         }
2183                                 } else {
2184                                         /*
2185                                          * They were forming a connection
2186                                          * to us, and we to them. Our
2187                                          * ATM address is numerically lower
2188                                          * than theirs, so we make connection
2189                                          * we formed into default VCC (8.1.11).
2190                                          * Connection they made gets torn
2191                                          * down. This might confuse some
2192                                          * clients. Can be changed if
2193                                          * someone reports trouble...
2194                                          */
2195                                         ;
2196                                 }
2197                         }
2198                 }
2199         }
2200         if (found_entry) {
2201                 pr_debug("After vcc was added\n");
2202                 dump_arp_table(priv);
2203                 goto out;
2204         }
2205         /*
2206          * Not found, snatch address from first data packet that arrives
2207          * from this vcc
2208          */
2209         entry = make_entry(priv, bus_mac);
2210         if (!entry)
2211                 goto out;
2212         entry->vcc = vcc;
2213         entry->old_push = old_push;
2214         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2215         memset(entry->mac_addr, 0, ETH_ALEN);
2216         entry->status = ESI_UNKNOWN;
2217         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2218         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2219         entry->timer.function = lec_arp_expire_vcc;
2220         add_timer(&entry->timer);
2221         pr_debug("After vcc was added\n");
2222         dump_arp_table(priv);
2223 out:
2224         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2225 }
2226
2227 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2228 {
2229         unsigned long flags;
2230         struct hlist_node *node;
2231         struct lec_arp_table *entry;
2232         int i;
2233
2234         pr_debug("%lx\n", tran_id);
2235 restart:
2236         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2237         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2238                 hlist_for_each_entry(entry, node,
2239                                      &priv->lec_arp_tables[i], next) {
2240                         if (entry->flush_tran_id == tran_id &&
2241                             entry->status == ESI_FLUSH_PENDING) {
2242                                 struct sk_buff *skb;
2243                                 struct atm_vcc *vcc = entry->vcc;
2244
2245                                 lec_arp_hold(entry);
2246                                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2247                                                        flags);
2248                                 while ((skb = skb_dequeue(&entry->tx_wait)))
2249                                         lec_send(vcc, skb);
2250                                 entry->last_used = jiffies;
2251                                 entry->status = ESI_FORWARD_DIRECT;
2252                                 lec_arp_put(entry);
2253                                 pr_debug("LEC_ARP: Flushed\n");
2254                                 goto restart;
2255                         }
2256                 }
2257         }
2258         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2259         dump_arp_table(priv);
2260 }
2261
2262 static void
2263 lec_set_flush_tran_id(struct lec_priv *priv,
2264                       const unsigned char *atm_addr, unsigned long tran_id)
2265 {
2266         unsigned long flags;
2267         struct hlist_node *node;
2268         struct lec_arp_table *entry;
2269         int i;
2270
2271         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2272         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2273                 hlist_for_each_entry(entry, node,
2274                                      &priv->lec_arp_tables[i], next) {
2275                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2276                                 entry->flush_tran_id = tran_id;
2277                                 pr_debug("Set flush transaction id to %lx for %p\n",
2278                                          tran_id, entry);
2279                         }
2280                 }
2281         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2282 }
2283
2284 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2285 {
2286         unsigned long flags;
2287         unsigned char mac_addr[] = {
2288                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2289         };
2290         struct lec_arp_table *to_add;
2291         struct lec_vcc_priv *vpriv;
2292         int err = 0;
2293
2294         vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2295         if (!vpriv)
2296                 return -ENOMEM;
2297         vpriv->xoff = 0;
2298         vpriv->old_pop = vcc->pop;
2299         vcc->user_back = vpriv;
2300         vcc->pop = lec_pop;
2301         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2302         to_add = make_entry(priv, mac_addr);
2303         if (!to_add) {
2304                 vcc->pop = vpriv->old_pop;
2305                 kfree(vpriv);
2306                 err = -ENOMEM;
2307                 goto out;
2308         }
2309         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2310         to_add->status = ESI_FORWARD_DIRECT;
2311         to_add->flags |= LEC_PERMANENT_FLAG;
2312         to_add->vcc = vcc;
2313         to_add->old_push = vcc->push;
2314         vcc->push = lec_push;
2315         priv->mcast_vcc = vcc;
2316         lec_arp_add(priv, to_add);
2317 out:
2318         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2319         return err;
2320 }
2321
2322 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2323 {
2324         unsigned long flags;
2325         struct hlist_node *node, *next;
2326         struct lec_arp_table *entry;
2327         int i;
2328
2329         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2330         dump_arp_table(priv);
2331
2332         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2333
2334         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2335                 hlist_for_each_entry_safe(entry, node, next,
2336                                           &priv->lec_arp_tables[i], next) {
2337                         if (vcc == entry->vcc) {
2338                                 lec_arp_remove(priv, entry);
2339                                 lec_arp_put(entry);
2340                                 if (priv->mcast_vcc == vcc)
2341                                         priv->mcast_vcc = NULL;
2342                         }
2343                 }
2344         }
2345
2346         hlist_for_each_entry_safe(entry, node, next,
2347                                   &priv->lec_arp_empty_ones, next) {
2348                 if (entry->vcc == vcc) {
2349                         lec_arp_clear_vccs(entry);
2350                         del_timer(&entry->timer);
2351                         hlist_del(&entry->next);
2352                         lec_arp_put(entry);
2353                 }
2354         }
2355
2356         hlist_for_each_entry_safe(entry, node, next,
2357                                   &priv->lec_no_forward, next) {
2358                 if (entry->recv_vcc == vcc) {
2359                         lec_arp_clear_vccs(entry);
2360                         del_timer(&entry->timer);
2361                         hlist_del(&entry->next);
2362                         lec_arp_put(entry);
2363                 }
2364         }
2365
2366         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2367                 if (entry->recv_vcc == vcc) {
2368                         lec_arp_clear_vccs(entry);
2369                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2370                         hlist_del(&entry->next);
2371                         lec_arp_put(entry);
2372                 }
2373         }
2374
2375         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2376         dump_arp_table(priv);
2377 }
2378
2379 static void
2380 lec_arp_check_empties(struct lec_priv *priv,
2381                       struct atm_vcc *vcc, struct sk_buff *skb)
2382 {
2383         unsigned long flags;
2384         struct hlist_node *node, *next;
2385         struct lec_arp_table *entry, *tmp;
2386         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2387         unsigned char *src;
2388 #ifdef CONFIG_TR
2389         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2390
2391         if (priv->is_trdev)
2392                 src = tr_hdr->h_source;
2393         else
2394 #endif
2395                 src = hdr->h_source;
2396
2397         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2398         hlist_for_each_entry_safe(entry, node, next,
2399                                   &priv->lec_arp_empty_ones, next) {
2400                 if (vcc == entry->vcc) {
2401                         del_timer(&entry->timer);
2402                         memcpy(entry->mac_addr, src, ETH_ALEN);
2403                         entry->status = ESI_FORWARD_DIRECT;
2404                         entry->last_used = jiffies;
2405                         /* We might have got an entry */
2406                         tmp = lec_arp_find(priv, src);
2407                         if (tmp) {
2408                                 lec_arp_remove(priv, tmp);
2409                                 lec_arp_put(tmp);
2410                         }
2411                         hlist_del(&entry->next);
2412                         lec_arp_add(priv, entry);
2413                         goto out;
2414                 }
2415         }
2416         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2417 out:
2418         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2419 }
2420
2421 MODULE_LICENSE("GPL");