net/atm/lec.c

   1 /*
   2  * lec.c: Lan Emulation driver
   3  *
   4  * Marko Kiiskila <mkiiskila@yahoo.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/bitops.h>
   9 #include <linux/capability.h>
  10
  11 /* We are ethernet device */
  12 #include <linux/if_ether.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <net/sock.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/ip.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/uaccess.h>
  20 #include <net/arp.h>
  21 #include <net/dst.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/seq_file.h>
  25
  26 /* TokenRing if needed */
  27 #ifdef CONFIG_TR
  28 #include <linux/trdevice.h>
  29 #endif
  30
  31 /* And atm device */
  32 #include <linux/atmdev.h>
  33 #include <linux/atmlec.h>
  34
  35 /* Proxy LEC knows about bridging */
  36 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
  37 #include "../bridge/br_private.h"
  38
  39 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  40 #endif
  41
  42 /* Modular too */
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45
  46 #include "lec.h"
  47 #include "lec_arpc.h"
  48 #include "resources.h"
  49
  50 #define DUMP_PACKETS 0          /*
  51                                  * 0 = None,
  52                                  * 1 = 30 first bytes
  53                                  * 2 = Whole packet
  54                                  */
  55
  56 #define LEC_UNRES_QUE_LEN 8     /*
  57                                  * number of tx packets to queue for a
  58                                  * single destination while waiting for SVC
  59                                  */
  60
  61 static int lec_open(struct net_device *dev);
  62 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
  63                                   struct net_device *dev);
  64 static int lec_close(struct net_device *dev);
  65 static void lec_init(struct net_device *dev);
  66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
  67                                           const unsigned char *mac_addr);
  68 static int lec_arp_remove(struct lec_priv *priv,
  69                           struct lec_arp_table *to_remove);
  70 /* LANE2 functions */
  71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
  72                                 const u8 *tlvs, u32 sizeoftlvs);
  73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
  74                          u8 **tlvs, u32 *sizeoftlvs);
  75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
  76                                const u8 *tlvs, u32 sizeoftlvs);
  77
  78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
  79                            unsigned long permanent);
  80 static void lec_arp_check_empties(struct lec_priv *priv,
  81                                   struct atm_vcc *vcc, struct sk_buff *skb);
  82 static void lec_arp_destroy(struct lec_priv *priv);
  83 static void lec_arp_init(struct lec_priv *priv);
  84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
  85                                        const unsigned char *mac_to_find,
  86                                        int is_rdesc,
  87                                        struct lec_arp_table **ret_entry);
  88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
  89                            const unsigned char *atm_addr, unsigned long remoteflag,
  90                            unsigned int targetless_le_arp);
  91 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
  92 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
  93 static void lec_set_flush_tran_id(struct lec_priv *priv,
  94                                   const unsigned char *atm_addr,
  95                                   unsigned long tran_id);
  96 static void lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
  97                           struct atm_vcc *vcc,
  98                           void (*old_push) (struct atm_vcc *vcc,
  99                                             struct sk_buff *skb));
 100 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 101
 102 /* must be done under lec_arp_lock */
 103 static inline void lec_arp_hold(struct lec_arp_table *entry)
 104 {
 105         atomic_inc(&entry->usage);
 106 }
 107
 108 static inline void lec_arp_put(struct lec_arp_table *entry)
 109 {
 110         if (atomic_dec_and_test(&entry->usage))
 111                 kfree(entry);
 112 }
 113
 114
 115 static struct lane2_ops lane2_ops = {
 116         lane2_resolve,          /* resolve,             spec 3.1.3 */
 117         lane2_associate_req,    /* associate_req,       spec 3.1.4 */
 118         NULL                    /* associate indicator, spec 3.1.5 */
 119 };
 120
 121 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 122
 123 /* Device structures */
 124 static struct net_device *dev_lec[MAX_LEC_ITF];
 125
 126 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 127 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
 128 {
 129         struct ethhdr *eth;
 130         char *buff;
 131         struct lec_priv *priv;
 132
 133         /*
 134          * Check if this is a BPDU. If so, ask zeppelin to send
 135          * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
 136          * as the Config BPDU has
 137          */
 138         eth = (struct ethhdr *)skb->data;
 139         buff = skb->data + skb->dev->hard_header_len;
 140         if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
 141                 struct sock *sk;
 142                 struct sk_buff *skb2;
 143                 struct atmlec_msg *mesg;
 144
 145                 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 146                 if (skb2 == NULL)
 147                         return;
 148                 skb2->len = sizeof(struct atmlec_msg);
 149                 mesg = (struct atmlec_msg *)skb2->data;
 150                 mesg->type = l_topology_change;
 151                 buff += 4;
 152                 mesg->content.normal.flag = *buff & 0x01;       /* 0x01 is topology change */
 153
 154                 priv = netdev_priv(dev);
 155                 atm_force_charge(priv->lecd, skb2->truesize);
 156                 sk = sk_atm(priv->lecd);
 157                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 158                 sk->sk_data_ready(sk, skb2->len);
 159         }
 160
 161         return;
 162 }
 163 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 164
 165 /*
 166  * Modelled after tr_type_trans
 167  * All multicast and ARE or STE frames go to BUS.
 168  * Non source routed frames go by destination address.
 169  * Last hop source routed frames go by destination address.
 170  * Not last hop source routed frames go by _next_ route descriptor.
 171  * Returns pointer to destination MAC address or fills in rdesc
 172  * and returns NULL.
 173  */
 174 #ifdef CONFIG_TR
 175 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
 176 {
 177         struct trh_hdr *trh;
 178         unsigned int riflen, num_rdsc;
 179
 180         trh = (struct trh_hdr *)packet;
 181         if (trh->daddr[0] & (uint8_t) 0x80)
 182                 return bus_mac; /* multicast */
 183
 184         if (trh->saddr[0] & TR_RII) {
 185                 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
 186                 if ((ntohs(trh->rcf) >> 13) != 0)
 187                         return bus_mac; /* ARE or STE */
 188         } else
 189                 return trh->daddr;      /* not source routed */
 190
 191         if (riflen < 6)
 192                 return trh->daddr;      /* last hop, source routed */
 193
 194         /* riflen is 6 or more, packet has more than one route descriptor */
 195         num_rdsc = (riflen / 2) - 1;
 196         memset(rdesc, 0, ETH_ALEN);
 197         /* offset 4 comes from LAN destination field in LE control frames */
 198         if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
 199                 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
 200         else {
 201                 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
 202                 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
 203         }
 204
 205         return NULL;
 206 }
 207 #endif /* CONFIG_TR */
 208
 209 /*
 210  * Open/initialize the netdevice. This is called (in the current kernel)
 211  * sometime after booting when the 'ifconfig' program is run.
 212  *
 213  * This routine should set everything up anew at each open, even
 214  * registers that "should" only need to be set once at boot, so that
 215  * there is non-reboot way to recover if something goes wrong.
 216  */
 217
 218 static int lec_open(struct net_device *dev)
 219 {
 220         netif_start_queue(dev);
 221         memset(&dev->stats, 0, sizeof(struct net_device_stats));
 222
 223         return 0;
 224 }
 225
 226 static void
 227 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 228 {
 229         struct net_device *dev = skb->dev;
 230
 231         ATM_SKB(skb)->vcc = vcc;
 232         ATM_SKB(skb)->atm_options = vcc->atm_options;
 233
 234         atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 235         if (vcc->send(vcc, skb) < 0) {
 236                 dev->stats.tx_dropped++;
 237                 return;
 238         }
 239
 240         dev->stats.tx_packets++;
 241         dev->stats.tx_bytes += skb->len;
 242 }
 243
 244 static void lec_tx_timeout(struct net_device *dev)
 245 {
 246         printk(KERN_INFO "%s: tx timeout\n", dev->name);
 247         dev->trans_start = jiffies;
 248         netif_wake_queue(dev);
 249 }
 250
 251 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
 252                                   struct net_device *dev)
 253 {
 254         struct sk_buff *skb2;
 255         struct lec_priv *priv = netdev_priv(dev);
 256         struct lecdatahdr_8023 *lec_h;
 257         struct atm_vcc *vcc;
 258         struct lec_arp_table *entry;
 259         unsigned char *dst;
 260         int min_frame_size;
 261 #ifdef CONFIG_TR
 262         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 263 #endif
 264         int is_rdesc;
 265 #if DUMP_PACKETS > 0
 266         char buf[300];
 267         int i = 0;
 268 #endif /* DUMP_PACKETS >0 */
 269
 270         pr_debug("lec_start_xmit called\n");
 271         if (!priv->lecd) {
 272                 printk("%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
 290                 pr_debug("lec_start_xmit: reallocating skb\n");
 291                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 292                 kfree_skb(skb);
 293                 if (skb2 == NULL)
 294                         return NETDEV_TX_OK;
 295                 skb = skb2;
 296         }
 297         skb_push(skb, 2);
 298
 299         /* Put le header to place, works for TokenRing too */
 300         lec_h = (struct lecdatahdr_8023 *)skb->data;
 301         lec_h->le_header = htons(priv->lecid);
 302
 303 #ifdef CONFIG_TR
 304         /*
 305          * Ugly. Use this to realign Token Ring packets for
 306          * e.g. PCA-200E driver.
 307          */
 308         if (priv->is_trdev) {
 309                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 310                 kfree_skb(skb);
 311                 if (skb2 == NULL)
 312                         return NETDEV_TX_OK;
 313                 skb = skb2;
 314         }
 315 #endif
 316
 317 #if DUMP_PACKETS > 0
 318         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 319                skb->len, priv->lecid);
 320 #if DUMP_PACKETS >= 2
 321         for (i = 0; i < skb->len && i < 99; i++) {
 322                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 323         }
 324 #elif DUMP_PACKETS >= 1
 325         for (i = 0; i < skb->len && i < 30; i++) {
 326                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 327         }
 328 #endif /* DUMP_PACKETS >= 1 */
 329         if (i == skb->len)
 330                 printk("%s\n", buf);
 331         else
 332                 printk("%s...\n", buf);
 333 #endif /* DUMP_PACKETS > 0 */
 334
 335         /* Minimum ethernet-frame size */
 336 #ifdef CONFIG_TR
 337         if (priv->is_trdev)
 338                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 339         else
 340 #endif
 341                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 342         if (skb->len < min_frame_size) {
 343                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 344                         skb2 = skb_copy_expand(skb, 0,
 345                                                min_frame_size - skb->truesize,
 346                                                GFP_ATOMIC);
 347                         dev_kfree_skb(skb);
 348                         if (skb2 == NULL) {
 349                                 dev->stats.tx_dropped++;
 350                                 return NETDEV_TX_OK;
 351                         }
 352                         skb = skb2;
 353                 }
 354                 skb_put(skb, min_frame_size - skb->len);
 355         }
 356
 357         /* Send to right vcc */
 358         is_rdesc = 0;
 359         dst = lec_h->h_dest;
 360 #ifdef CONFIG_TR
 361         if (priv->is_trdev) {
 362                 dst = get_tr_dst(skb->data + 2, rdesc);
 363                 if (dst == NULL) {
 364                         dst = rdesc;
 365                         is_rdesc = 1;
 366                 }
 367         }
 368 #endif
 369         entry = NULL;
 370         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 371         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 372                 vcc, vcc ? vcc->flags : 0, entry);
 373         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 374                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 375                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 376                                 dev->name);
 377                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 378                         skb_queue_tail(&entry->tx_wait, skb);
 379                 } else {
 380                         pr_debug
 381                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 382                              dev->name);
 383                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 384                         dev->stats.tx_dropped++;
 385                         dev_kfree_skb(skb);
 386                 }
 387                 goto out;
 388         }
 389 #if DUMP_PACKETS > 0
 390         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 391 #endif /* DUMP_PACKETS > 0 */
 392
 393         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 394                 pr_debug("lec.c: emptying tx queue, ");
 395                 pr_debug("MAC address %pM\n", lec_h->h_dest);
 396                 lec_send(vcc, skb2);
 397         }
 398
 399         lec_send(vcc, skb);
 400
 401         if (!atm_may_send(vcc, 0)) {
 402                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 403
 404                 vpriv->xoff = 1;
 405                 netif_stop_queue(dev);
 406
 407                 /*
 408                  * vcc->pop() might have occurred in between, making
 409                  * the vcc usuable again.  Since xmit is serialized,
 410                  * this is the only situation we have to re-test.
 411                  */
 412
 413                 if (atm_may_send(vcc, 0))
 414                         netif_wake_queue(dev);
 415         }
 416
 417 out:
 418         if (entry)
 419                 lec_arp_put(entry);
 420         dev->trans_start = jiffies;
 421         return NETDEV_TX_OK;
 422 }
 423
 424 /* The inverse routine to net_open(). */
 425 static int lec_close(struct net_device *dev)
 426 {
 427         netif_stop_queue(dev);
 428         return 0;
 429 }
 430
 431 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 432 {
 433         unsigned long flags;
 434         struct net_device *dev = (struct net_device *)vcc->proto_data;
 435         struct lec_priv *priv = netdev_priv(dev);
 436         struct atmlec_msg *mesg;
 437         struct lec_arp_table *entry;
 438         int i;
 439         char *tmp;              /* FIXME */
 440
 441         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 442         mesg = (struct atmlec_msg *)skb->data;
 443         tmp = skb->data;
 444         tmp += sizeof(struct atmlec_msg);
 445         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 446         switch (mesg->type) {
 447         case l_set_mac_addr:
 448                 for (i = 0; i < 6; i++) {
 449                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 450                 }
 451                 break;
 452         case l_del_mac_addr:
 453                 for (i = 0; i < 6; i++) {
 454                         dev->dev_addr[i] = 0;
 455                 }
 456                 break;
 457         case l_addr_delete:
 458                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 459                                 mesg->content.normal.flag);
 460                 break;
 461         case l_topology_change:
 462                 priv->topology_change = mesg->content.normal.flag;
 463                 break;
 464         case l_flush_complete:
 465                 lec_flush_complete(priv, mesg->content.normal.flag);
 466                 break;
 467         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 468                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 469                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 470                 lec_arp_remove(priv, entry);
 471                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 472
 473                 if (mesg->content.normal.no_source_le_narp)
 474                         break;
 475                 /* FALL THROUGH */
 476         case l_arp_update:
 477                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 478                                mesg->content.normal.atm_addr,
 479                                mesg->content.normal.flag,
 480                                mesg->content.normal.targetless_le_arp);
 481                 pr_debug("lec: in l_arp_update\n");
 482                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 483                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 484                                 mesg->sizeoftlvs);
 485                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 486                                             tmp, mesg->sizeoftlvs);
 487                 }
 488                 break;
 489         case l_config:
 490                 priv->maximum_unknown_frame_count =
 491                     mesg->content.config.maximum_unknown_frame_count;
 492                 priv->max_unknown_frame_time =
 493                     (mesg->content.config.max_unknown_frame_time * HZ);
 494                 priv->max_retry_count = mesg->content.config.max_retry_count;
 495                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 496                 priv->forward_delay_time =
 497                     (mesg->content.config.forward_delay_time * HZ);
 498                 priv->arp_response_time =
 499                     (mesg->content.config.arp_response_time * HZ);
 500                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 501                 priv->path_switching_delay =
 502                     (mesg->content.config.path_switching_delay * HZ);
 503                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 504                 priv->lane2_ops = NULL;
 505                 if (priv->lane_version > 1)
 506                         priv->lane2_ops = &lane2_ops;
 507                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 508                         printk("%s: change_mtu to %d failed\n", dev->name,
 509                                mesg->content.config.mtu);
 510                 priv->is_proxy = mesg->content.config.is_proxy;
 511                 break;
 512         case l_flush_tran_id:
 513                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 514                                       mesg->content.normal.flag);
 515                 break;
 516         case l_set_lecid:
 517                 priv->lecid =
 518                     (unsigned short)(0xffff & mesg->content.normal.flag);
 519                 break;
 520         case l_should_bridge:
 521 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 522                 {
 523                         pr_debug("%s: bridge zeppelin asks about %pM\n",
 524                                  dev->name, mesg->content.proxy.mac_addr);
 525
 526                         if (br_fdb_test_addr_hook == NULL)
 527                                 break;
 528
 529                         if (br_fdb_test_addr_hook(dev,
 530                                         mesg->content.proxy.mac_addr)) {
 531                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 532                                 struct sk_buff *skb2;
 533                                 struct sock *sk;
 534
 535                                 pr_debug
 536                                     ("%s: entry found, responding to zeppelin\n",
 537                                      dev->name);
 538                                 skb2 =
 539                                     alloc_skb(sizeof(struct atmlec_msg),
 540                                               GFP_ATOMIC);
 541                                 if (skb2 == NULL)
 542                                         break;
 543                                 skb2->len = sizeof(struct atmlec_msg);
 544                                 skb_copy_to_linear_data(skb2, mesg,
 545                                                         sizeof(*mesg));
 546                                 atm_force_charge(priv->lecd, skb2->truesize);
 547                                 sk = sk_atm(priv->lecd);
 548                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 549                                 sk->sk_data_ready(sk, skb2->len);
 550                         }
 551                 }
 552 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 553                 break;
 554         default:
 555                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 556                 dev_kfree_skb(skb);
 557                 return -EINVAL;
 558         }
 559         dev_kfree_skb(skb);
 560         return 0;
 561 }
 562
 563 static void lec_atm_close(struct atm_vcc *vcc)
 564 {
 565         struct sk_buff *skb;
 566         struct net_device *dev = (struct net_device *)vcc->proto_data;
 567         struct lec_priv *priv = netdev_priv(dev);
 568
 569         priv->lecd = NULL;
 570         /* Do something needful? */
 571
 572         netif_stop_queue(dev);
 573         lec_arp_destroy(priv);
 574
 575         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 576                 printk("%s lec_atm_close: closing with messages pending\n",
 577                        dev->name);
 578         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 579                 atm_return(vcc, skb->truesize);
 580                 dev_kfree_skb(skb);
 581         }
 582
 583         printk("%s: Shut down!\n", dev->name);
 584         module_put(THIS_MODULE);
 585 }
 586
 587 static struct atmdev_ops lecdev_ops = {
 588         .close = lec_atm_close,
 589         .send = lec_atm_send
 590 };
 591
 592 static struct atm_dev lecatm_dev = {
 593         .ops = &lecdev_ops,
 594         .type = "lec",
 595         .number = 999,          /* dummy device number */
 596         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 597 };
 598
 599 /*
 600  * LANE2: new argument struct sk_buff *data contains
 601  * the LE_ARP based TLVs introduced in the LANE2 spec
 602  */
 603 static int
 604 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 605              const unsigned char *mac_addr, const unsigned char *atm_addr,
 606              struct sk_buff *data)
 607 {
 608         struct sock *sk;
 609         struct sk_buff *skb;
 610         struct atmlec_msg *mesg;
 611
 612         if (!priv || !priv->lecd) {
 613                 return -1;
 614         }
 615         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 616         if (!skb)
 617                 return -1;
 618         skb->len = sizeof(struct atmlec_msg);
 619         mesg = (struct atmlec_msg *)skb->data;
 620         memset(mesg, 0, sizeof(struct atmlec_msg));
 621         mesg->type = type;
 622         if (data != NULL)
 623                 mesg->sizeoftlvs = data->len;
 624         if (mac_addr)
 625                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 626         else
 627                 mesg->content.normal.targetless_le_arp = 1;
 628         if (atm_addr)
 629                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 630
 631         atm_force_charge(priv->lecd, skb->truesize);
 632         sk = sk_atm(priv->lecd);
 633         skb_queue_tail(&sk->sk_receive_queue, skb);
 634         sk->sk_data_ready(sk, skb->len);
 635
 636         if (data != NULL) {
 637                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 638                 atm_force_charge(priv->lecd, data->truesize);
 639                 skb_queue_tail(&sk->sk_receive_queue, data);
 640                 sk->sk_data_ready(sk, skb->len);
 641         }
 642
 643         return 0;
 644 }
 645
 646 /* shamelessly stolen from drivers/net/net_init.c */
 647 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 648 {
 649         if ((new_mtu < 68) || (new_mtu > 18190))
 650                 return -EINVAL;
 651         dev->mtu = new_mtu;
 652         return 0;
 653 }
 654
 655 static void lec_set_multicast_list(struct net_device *dev)
 656 {
 657         /*
 658          * by default, all multicast frames arrive over the bus.
 659          * eventually support selective multicast service
 660          */
 661         return;
 662 }
 663
 664 static const struct net_device_ops lec_netdev_ops = {
 665         .ndo_open               = lec_open,
 666         .ndo_stop               = lec_close,
 667         .ndo_start_xmit         = lec_start_xmit,
 668         .ndo_change_mtu         = lec_change_mtu,
 669         .ndo_tx_timeout         = lec_tx_timeout,
 670         .ndo_set_multicast_list = lec_set_multicast_list,
 671 };
 672
 673
 674 static void lec_init(struct net_device *dev)
 675 {
 676         dev->netdev_ops = &lec_netdev_ops;
 677         printk("%s: Initialized!\n", dev->name);
 678 }
 679
 680 static const unsigned char lec_ctrl_magic[] = {
 681         0xff,
 682         0x00,
 683         0x01,
 684         0x01
 685 };
 686
 687 #define LEC_DATA_DIRECT_8023  2
 688 #define LEC_DATA_DIRECT_8025  3
 689
 690 static int lec_is_data_direct(struct atm_vcc *vcc)
 691 {
 692         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 693                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 694 }
 695
 696 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 697 {
 698         unsigned long flags;
 699         struct net_device *dev = (struct net_device *)vcc->proto_data;
 700         struct lec_priv *priv = netdev_priv(dev);
 701
 702 #if DUMP_PACKETS >0
 703         int i = 0;
 704         char buf[300];
 705
 706         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 707                vcc->vpi, vcc->vci);
 708 #endif
 709         if (!skb) {
 710                 pr_debug("%s: null skb\n", dev->name);
 711                 lec_vcc_close(priv, vcc);
 712                 return;
 713         }
 714 #if DUMP_PACKETS > 0
 715         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 716                skb->len, priv->lecid);
 717 #if DUMP_PACKETS >= 2
 718         for (i = 0; i < skb->len && i < 99; i++) {
 719                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 720         }
 721 #elif DUMP_PACKETS >= 1
 722         for (i = 0; i < skb->len && i < 30; i++) {
 723                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 724         }
 725 #endif /* DUMP_PACKETS >= 1 */
 726         if (i == skb->len)
 727                 printk("%s\n", buf);
 728         else
 729                 printk("%s...\n", buf);
 730 #endif /* DUMP_PACKETS > 0 */
 731         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 732                 struct sock *sk = sk_atm(vcc);
 733
 734                 pr_debug("%s: To daemon\n", dev->name);
 735                 skb_queue_tail(&sk->sk_receive_queue, skb);
 736                 sk->sk_data_ready(sk, skb->len);
 737         } else {                /* Data frame, queue to protocol handlers */
 738                 struct lec_arp_table *entry;
 739                 unsigned char *src, *dst;
 740
 741                 atm_return(vcc, skb->truesize);
 742                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 743                     !priv->lecd || !(dev->flags & IFF_UP)) {
 744                         /*
 745                          * Probably looping back, or if lecd is missing,
 746                          * lecd has gone down
 747                          */
 748                         pr_debug("Ignoring frame...\n");
 749                         dev_kfree_skb(skb);
 750                         return;
 751                 }
 752 #ifdef CONFIG_TR
 753                 if (priv->is_trdev)
 754                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 755                 else
 756 #endif
 757                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 758
 759                 /*
 760                  * If this is a Data Direct VCC, and the VCC does not match
 761                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 762                  */
 763                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 764                 if (lec_is_data_direct(vcc)) {
 765 #ifdef CONFIG_TR
 766                         if (priv->is_trdev)
 767                                 src =
 768                                     ((struct lecdatahdr_8025 *)skb->data)->
 769                                     h_source;
 770                         else
 771 #endif
 772                                 src =
 773                                     ((struct lecdatahdr_8023 *)skb->data)->
 774                                     h_source;
 775                         entry = lec_arp_find(priv, src);
 776                         if (entry && entry->vcc != vcc) {
 777                                 lec_arp_remove(priv, entry);
 778                                 lec_arp_put(entry);
 779                         }
 780                 }
 781                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 782
 783                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 784                     !priv->is_proxy &&  /* Proxy wants all the packets */
 785                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 786                         dev_kfree_skb(skb);
 787                         return;
 788                 }
 789                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 790                         lec_arp_check_empties(priv, vcc, skb);
 791                 }
 792                 skb_pull(skb, 2);       /* skip lec_id */
 793 #ifdef CONFIG_TR
 794                 if (priv->is_trdev)
 795                         skb->protocol = tr_type_trans(skb, dev);
 796                 else
 797 #endif
 798                         skb->protocol = eth_type_trans(skb, dev);
 799                 dev->stats.rx_packets++;
 800                 dev->stats.rx_bytes += skb->len;
 801                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 802                 netif_rx(skb);
 803         }
 804 }
 805
 806 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 807 {
 808         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 809         struct net_device *dev = skb->dev;
 810
 811         if (vpriv == NULL) {
 812                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 813                 return;
 814         }
 815
 816         vpriv->old_pop(vcc, skb);
 817
 818         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 819                 vpriv->xoff = 0;
 820                 if (netif_running(dev) && netif_queue_stopped(dev))
 821                         netif_wake_queue(dev);
 822         }
 823 }
 824
 825 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 826 {
 827         struct lec_vcc_priv *vpriv;
 828         int bytes_left;
 829         struct atmlec_ioc ioc_data;
 830
 831         /* Lecd must be up in this case */
 832         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 833         if (bytes_left != 0) {
 834                 printk
 835                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 836                      bytes_left);
 837         }
 838         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 839             !dev_lec[ioc_data.dev_num])
 840                 return -EINVAL;
 841         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 842                 return -ENOMEM;
 843         vpriv->xoff = 0;
 844         vpriv->old_pop = vcc->pop;
 845         vcc->user_back = vpriv;
 846         vcc->pop = lec_pop;
 847         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 848                       &ioc_data, vcc, vcc->push);
 849         vcc->proto_data = dev_lec[ioc_data.dev_num];
 850         vcc->push = lec_push;
 851         return 0;
 852 }
 853
 854 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 855 {
 856         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 857                 return -EINVAL;
 858         vcc->proto_data = dev_lec[arg];
 859         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 860                                 vcc);
 861 }
 862
 863 /* Initialize device. */
 864 static int lecd_attach(struct atm_vcc *vcc, int arg)
 865 {
 866         int i;
 867         struct lec_priv *priv;
 868
 869         if (arg < 0)
 870                 i = 0;
 871         else
 872                 i = arg;
 873 #ifdef CONFIG_TR
 874         if (arg >= MAX_LEC_ITF)
 875                 return -EINVAL;
 876 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 877         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 878                 return -EINVAL;
 879 #endif
 880         if (!dev_lec[i]) {
 881                 int is_trdev, size;
 882
 883                 is_trdev = 0;
 884                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 885                         is_trdev = 1;
 886
 887                 size = sizeof(struct lec_priv);
 888 #ifdef CONFIG_TR
 889                 if (is_trdev)
 890                         dev_lec[i] = alloc_trdev(size);
 891                 else
 892 #endif
 893                         dev_lec[i] = alloc_etherdev(size);
 894                 if (!dev_lec[i])
 895                         return -ENOMEM;
 896                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 897                 if (register_netdev(dev_lec[i])) {
 898                         free_netdev(dev_lec[i]);
 899                         return -EINVAL;
 900                 }
 901
 902                 priv = netdev_priv(dev_lec[i]);
 903                 priv->is_trdev = is_trdev;
 904                 lec_init(dev_lec[i]);
 905         } else {
 906                 priv = netdev_priv(dev_lec[i]);
 907                 if (priv->lecd)
 908                         return -EADDRINUSE;
 909         }
 910         lec_arp_init(priv);
 911         priv->itfnum = i;       /* LANE2 addition */
 912         priv->lecd = vcc;
 913         vcc->dev = &lecatm_dev;
 914         vcc_insert_socket(sk_atm(vcc));
 915
 916         vcc->proto_data = dev_lec[i];
 917         set_bit(ATM_VF_META, &vcc->flags);
 918         set_bit(ATM_VF_READY, &vcc->flags);
 919
 920         /* Set default values to these variables */
 921         priv->maximum_unknown_frame_count = 1;
 922         priv->max_unknown_frame_time = (1 * HZ);
 923         priv->vcc_timeout_period = (1200 * HZ);
 924         priv->max_retry_count = 1;
 925         priv->aging_time = (300 * HZ);
 926         priv->forward_delay_time = (15 * HZ);
 927         priv->topology_change = 0;
 928         priv->arp_response_time = (1 * HZ);
 929         priv->flush_timeout = (4 * HZ);
 930         priv->path_switching_delay = (6 * HZ);
 931
 932         if (dev_lec[i]->flags & IFF_UP) {
 933                 netif_start_queue(dev_lec[i]);
 934         }
 935         __module_get(THIS_MODULE);
 936         return i;
 937 }
 938
 939 #ifdef CONFIG_PROC_FS
 940 static const char *lec_arp_get_status_string(unsigned char status)
 941 {
 942         static const char *const lec_arp_status_string[] = {
 943                 "ESI_UNKNOWN       ",
 944                 "ESI_ARP_PENDING   ",
 945                 "ESI_VC_PENDING    ",
 946                 "<Undefined>       ",
 947                 "ESI_FLUSH_PENDING ",
 948                 "ESI_FORWARD_DIRECT"
 949         };
 950
 951         if (status > ESI_FORWARD_DIRECT)
 952                 status = 3;     /* ESI_UNDEFINED */
 953         return lec_arp_status_string[status];
 954 }
 955
 956 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 957 {
 958         int i;
 959
 960         for (i = 0; i < ETH_ALEN; i++)
 961                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 962         seq_printf(seq, " ");
 963         for (i = 0; i < ATM_ESA_LEN; i++)
 964                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 965         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 966                    entry->flags & 0xffff);
 967         if (entry->vcc)
 968                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 969         else
 970                 seq_printf(seq, "        ");
 971         if (entry->recv_vcc) {
 972                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 973                            entry->recv_vcc->vci);
 974         }
 975         seq_putc(seq, '\n');
 976 }
 977
 978 struct lec_state {
 979         unsigned long flags;
 980         struct lec_priv *locked;
 981         struct hlist_node *node;
 982         struct net_device *dev;
 983         int itf;
 984         int arp_table;
 985         int misc_table;
 986 };
 987
 988 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 989                           loff_t *l)
 990 {
 991         struct hlist_node *e = state->node;
 992         struct lec_arp_table *tmp;
 993
 994         if (!e)
 995                 e = tbl->first;
 996         if (e == SEQ_START_TOKEN) {
 997                 e = tbl->first;
 998                 --*l;
 999         }
1000
1001         hlist_for_each_entry_from(tmp, e, next) {
1002                 if (--*l < 0)
1003                         break;
1004         }
1005         state->node = e;
1006
1007         return (*l < 0) ? state : NULL;
1008 }
1009
1010 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1011                           struct lec_priv *priv)
1012 {
1013         void *v = NULL;
1014         int p;
1015
1016         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1017                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1018                 if (v)
1019                         break;
1020         }
1021         state->arp_table = p;
1022         return v;
1023 }
1024
1025 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1026                            struct lec_priv *priv)
1027 {
1028         struct hlist_head *lec_misc_tables[] = {
1029                 &priv->lec_arp_empty_ones,
1030                 &priv->lec_no_forward,
1031                 &priv->mcast_fwds
1032         };
1033         void *v = NULL;
1034         int q;
1035
1036         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1037                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1038                 if (v)
1039                         break;
1040         }
1041         state->misc_table = q;
1042         return v;
1043 }
1044
1045 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1046                            struct lec_priv *priv)
1047 {
1048         if (!state->locked) {
1049                 state->locked = priv;
1050                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1051         }
1052         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1053                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1054                 state->locked = NULL;
1055                 /* Partial state reset for the next time we get called */
1056                 state->arp_table = state->misc_table = 0;
1057         }
1058         return state->locked;
1059 }
1060
1061 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1062 {
1063         struct net_device *dev;
1064         void *v;
1065
1066         dev = state->dev ? state->dev : dev_lec[state->itf];
1067         v = (dev && netdev_priv(dev)) ?
1068                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1069         if (!v && dev) {
1070                 dev_put(dev);
1071                 /* Partial state reset for the next time we get called */
1072                 dev = NULL;
1073         }
1074         state->dev = dev;
1075         return v;
1076 }
1077
1078 static void *lec_get_idx(struct lec_state *state, loff_t l)
1079 {
1080         void *v = NULL;
1081
1082         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1083                 v = lec_itf_walk(state, &l);
1084                 if (v)
1085                         break;
1086         }
1087         return v;
1088 }
1089
1090 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1091 {
1092         struct lec_state *state = seq->private;
1093
1094         state->itf = 0;
1095         state->dev = NULL;
1096         state->locked = NULL;
1097         state->arp_table = 0;
1098         state->misc_table = 0;
1099         state->node = SEQ_START_TOKEN;
1100
1101         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1102 }
1103
1104 static void lec_seq_stop(struct seq_file *seq, void *v)
1105 {
1106         struct lec_state *state = seq->private;
1107
1108         if (state->dev) {
1109                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1110                                        state->flags);
1111                 dev_put(state->dev);
1112         }
1113 }
1114
1115 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1116 {
1117         struct lec_state *state = seq->private;
1118
1119         v = lec_get_idx(state, 1);
1120         *pos += !!PTR_ERR(v);
1121         return v;
1122 }
1123
1124 static int lec_seq_show(struct seq_file *seq, void *v)
1125 {
1126         static const char lec_banner[] =
1127             "Itf  MAC          ATM destination"
1128             "                          Status            Flags "
1129             "VPI/VCI Recv VPI/VCI\n";
1130
1131         if (v == SEQ_START_TOKEN)
1132                 seq_puts(seq, lec_banner);
1133         else {
1134                 struct lec_state *state = seq->private;
1135                 struct net_device *dev = state->dev;
1136                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1137
1138                 seq_printf(seq, "%s ", dev->name);
1139                 lec_info(seq, entry);
1140         }
1141         return 0;
1142 }
1143
1144 static const struct seq_operations lec_seq_ops = {
1145         .start = lec_seq_start,
1146         .next = lec_seq_next,
1147         .stop = lec_seq_stop,
1148         .show = lec_seq_show,
1149 };
1150
1151 static int lec_seq_open(struct inode *inode, struct file *file)
1152 {
1153         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1154 }
1155
1156 static const struct file_operations lec_seq_fops = {
1157         .owner = THIS_MODULE,
1158         .open = lec_seq_open,
1159         .read = seq_read,
1160         .llseek = seq_lseek,
1161         .release = seq_release_private,
1162 };
1163 #endif
1164
1165 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1166 {
1167         struct atm_vcc *vcc = ATM_SD(sock);
1168         int err = 0;
1169
1170         switch (cmd) {
1171         case ATMLEC_CTRL:
1172         case ATMLEC_MCAST:
1173         case ATMLEC_DATA:
1174                 if (!capable(CAP_NET_ADMIN))
1175                         return -EPERM;
1176                 break;
1177         default:
1178                 return -ENOIOCTLCMD;
1179         }
1180
1181         switch (cmd) {
1182         case ATMLEC_CTRL:
1183                 err = lecd_attach(vcc, (int)arg);
1184                 if (err >= 0)
1185                         sock->state = SS_CONNECTED;
1186                 break;
1187         case ATMLEC_MCAST:
1188                 err = lec_mcast_attach(vcc, (int)arg);
1189                 break;
1190         case ATMLEC_DATA:
1191                 err = lec_vcc_attach(vcc, (void __user *)arg);
1192                 break;
1193         }
1194
1195         return err;
1196 }
1197
1198 static struct atm_ioctl lane_ioctl_ops = {
1199         .owner = THIS_MODULE,
1200         .ioctl = lane_ioctl,
1201 };
1202
1203 static int __init lane_module_init(void)
1204 {
1205 #ifdef CONFIG_PROC_FS
1206         struct proc_dir_entry *p;
1207
1208         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1209         if (!p) {
1210                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1211                 return -ENOMEM;
1212         }
1213 #endif
1214
1215         register_atm_ioctl(&lane_ioctl_ops);
1216         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1217         return 0;
1218 }
1219
1220 static void __exit lane_module_cleanup(void)
1221 {
1222         int i;
1223         struct lec_priv *priv;
1224
1225         remove_proc_entry("lec", atm_proc_root);
1226
1227         deregister_atm_ioctl(&lane_ioctl_ops);
1228
1229         for (i = 0; i < MAX_LEC_ITF; i++) {
1230                 if (dev_lec[i] != NULL) {
1231                         priv = netdev_priv(dev_lec[i]);
1232                         unregister_netdev(dev_lec[i]);
1233                         free_netdev(dev_lec[i]);
1234                         dev_lec[i] = NULL;
1235                 }
1236         }
1237
1238         return;
1239 }
1240
1241 module_init(lane_module_init);
1242 module_exit(lane_module_cleanup);
1243
1244 /*
1245  * LANE2: 3.1.3, LE_RESOLVE.request
1246  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1247  * If sizeoftlvs == NULL the default TLVs associated with with this
1248  * lec will be used.
1249  * If dst_mac == NULL, targetless LE_ARP will be sent
1250  */
1251 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1252                          u8 **tlvs, u32 *sizeoftlvs)
1253 {
1254         unsigned long flags;
1255         struct lec_priv *priv = netdev_priv(dev);
1256         struct lec_arp_table *table;
1257         struct sk_buff *skb;
1258         int retval;
1259
1260         if (force == 0) {
1261                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1262                 table = lec_arp_find(priv, dst_mac);
1263                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1264                 if (table == NULL)
1265                         return -1;
1266
1267                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1268                 if (*tlvs == NULL)
1269                         return -1;
1270
1271                 *sizeoftlvs = table->sizeoftlvs;
1272
1273                 return 0;
1274         }
1275
1276         if (sizeoftlvs == NULL)
1277                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1278
1279         else {
1280                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1281                 if (skb == NULL)
1282                         return -1;
1283                 skb->len = *sizeoftlvs;
1284                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1285                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1286         }
1287         return retval;
1288 }
1289
1290 /*
1291  * LANE2: 3.1.4, LE_ASSOCIATE.request
1292  * Associate the *tlvs with the *lan_dst address.
1293  * Will overwrite any previous association
1294  * Returns 1 for success, 0 for failure (out of memory)
1295  *
1296  */
1297 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1298                                const u8 *tlvs, u32 sizeoftlvs)
1299 {
1300         int retval;
1301         struct sk_buff *skb;
1302         struct lec_priv *priv = netdev_priv(dev);
1303
1304         if (compare_ether_addr(lan_dst, dev->dev_addr))
1305                 return (0);     /* not our mac address */
1306
1307         kfree(priv->tlvs);      /* NULL if there was no previous association */
1308
1309         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1310         if (priv->tlvs == NULL)
1311                 return (0);
1312         priv->sizeoftlvs = sizeoftlvs;
1313
1314         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1315         if (skb == NULL)
1316                 return 0;
1317         skb->len = sizeoftlvs;
1318         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1319         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1320         if (retval != 0)
1321                 printk("lec.c: lane2_associate_req() failed\n");
1322         /*
1323          * If the previous association has changed we must
1324          * somehow notify other LANE entities about the change
1325          */
1326         return (1);
1327 }
1328
1329 /*
1330  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1331  *
1332  */
1333 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1334                                 const u8 *tlvs, u32 sizeoftlvs)
1335 {
1336 #if 0
1337         int i = 0;
1338 #endif
1339         struct lec_priv *priv = netdev_priv(dev);
1340 #if 0                           /*
1341                                  * Why have the TLVs in LE_ARP entries
1342                                  * since we do not use them? When you
1343                                  * uncomment this code, make sure the
1344                                  * TLVs get freed when entry is killed
1345                                  */
1346         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1347
1348         if (entry == NULL)
1349                 return;         /* should not happen */
1350
1351         kfree(entry->tlvs);
1352
1353         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1354         if (entry->tlvs == NULL)
1355                 return;
1356         entry->sizeoftlvs = sizeoftlvs;
1357 #endif
1358 #if 0
1359         printk("lec.c: lane2_associate_ind()\n");
1360         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1361         while (i < sizeoftlvs)
1362                 printk("%02x ", tlvs[i++]);
1363
1364         printk("\n");
1365 #endif
1366
1367         /* tell MPOA about the TLVs we saw */
1368         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1369                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1370                                                      tlvs, sizeoftlvs);
1371         }
1372         return;
1373 }
1374
1375 /*
1376  * Here starts what used to lec_arpc.c
1377  *
1378  * lec_arpc.c was added here when making
1379  * lane client modular. October 1997
1380  */
1381
1382 #include <linux/types.h>
1383 #include <linux/timer.h>
1384 #include <asm/param.h>
1385 #include <asm/atomic.h>
1386 #include <linux/inetdevice.h>
1387 #include <net/route.h>
1388
1389 #if 0
1390 #define pr_debug(format,args...)
1391 /*
1392 #define pr_debug printk
1393 */
1394 #endif
1395 #define DEBUG_ARP_TABLE 0
1396
1397 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1398
1399 static void lec_arp_check_expire(struct work_struct *work);
1400 static void lec_arp_expire_arp(unsigned long data);
1401
1402 /*
1403  * Arp table funcs
1404  */
1405
1406 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1407
1408 /*
1409  * Initialization of arp-cache
1410  */
1411 static void lec_arp_init(struct lec_priv *priv)
1412 {
1413         unsigned short i;
1414
1415         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1416                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1417         }
1418         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1419         INIT_HLIST_HEAD(&priv->lec_no_forward);
1420         INIT_HLIST_HEAD(&priv->mcast_fwds);
1421         spin_lock_init(&priv->lec_arp_lock);
1422         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1423         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1424 }
1425
1426 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1427 {
1428         if (entry->vcc) {
1429                 struct atm_vcc *vcc = entry->vcc;
1430                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1431                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1432
1433                 vcc->pop = vpriv->old_pop;
1434                 if (vpriv->xoff)
1435                         netif_wake_queue(dev);
1436                 kfree(vpriv);
1437                 vcc->user_back = NULL;
1438                 vcc->push = entry->old_push;
1439                 vcc_release_async(vcc, -EPIPE);
1440                 entry->vcc = NULL;
1441         }
1442         if (entry->recv_vcc) {
1443                 entry->recv_vcc->push = entry->old_recv_push;
1444                 vcc_release_async(entry->recv_vcc, -EPIPE);
1445                 entry->recv_vcc = NULL;
1446         }
1447 }
1448
1449 /*
1450  * Insert entry to lec_arp_table
1451  * LANE2: Add to the end of the list to satisfy 8.1.13
1452  */
1453 static inline void
1454 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1455 {
1456         struct hlist_head *tmp;
1457
1458         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1459         hlist_add_head(&entry->next, tmp);
1460
1461         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1462                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1463                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1464                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1465 }
1466
1467 /*
1468  * Remove entry from lec_arp_table
1469  */
1470 static int
1471 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1472 {
1473         struct hlist_node *node;
1474         struct lec_arp_table *entry;
1475         int i, remove_vcc = 1;
1476
1477         if (!to_remove) {
1478                 return -1;
1479         }
1480
1481         hlist_del(&to_remove->next);
1482         del_timer(&to_remove->timer);
1483
1484         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1485         if (to_remove->status >= ESI_FLUSH_PENDING) {
1486                 /*
1487                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1488                  */
1489                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1490                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1491                                 if (memcmp(to_remove->atm_addr,
1492                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1493                                         remove_vcc = 0;
1494                                         break;
1495                                 }
1496                         }
1497                 }
1498                 if (remove_vcc)
1499                         lec_arp_clear_vccs(to_remove);
1500         }
1501         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1502
1503         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1504                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1505                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1506                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1507         return 0;
1508 }
1509
1510 #if DEBUG_ARP_TABLE
1511 static const char *get_status_string(unsigned char st)
1512 {
1513         switch (st) {
1514         case ESI_UNKNOWN:
1515                 return "ESI_UNKNOWN";
1516         case ESI_ARP_PENDING:
1517                 return "ESI_ARP_PENDING";
1518         case ESI_VC_PENDING:
1519                 return "ESI_VC_PENDING";
1520         case ESI_FLUSH_PENDING:
1521                 return "ESI_FLUSH_PENDING";
1522         case ESI_FORWARD_DIRECT:
1523                 return "ESI_FORWARD_DIRECT";
1524         default:
1525                 return "<UNKNOWN>";
1526         }
1527 }
1528
1529 static void dump_arp_table(struct lec_priv *priv)
1530 {
1531         struct hlist_node *node;
1532         struct lec_arp_table *rulla;
1533         char buf[256];
1534         int i, j, offset;
1535
1536         printk("Dump %p:\n", priv);
1537         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1538                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1539                         offset = 0;
1540                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1541                         offset += sprintf(buf + offset, "Mac:");
1542                         for (j = 0; j < ETH_ALEN; j++) {
1543                                 offset += sprintf(buf + offset,
1544                                                   "%2.2x ",
1545                                                   rulla->mac_addr[j] & 0xff);
1546                         }
1547                         offset += sprintf(buf + offset, "Atm:");
1548                         for (j = 0; j < ATM_ESA_LEN; j++) {
1549                                 offset += sprintf(buf + offset,
1550                                                   "%2.2x ",
1551                                                   rulla->atm_addr[j] & 0xff);
1552                         }
1553                         offset += sprintf(buf + offset,
1554                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1555                                           rulla->vcc ? rulla->vcc->vpi : 0,
1556                                           rulla->vcc ? rulla->vcc->vci : 0,
1557                                           rulla->recv_vcc ? rulla->recv_vcc->
1558                                           vpi : 0,
1559                                           rulla->recv_vcc ? rulla->recv_vcc->
1560                                           vci : 0, rulla->last_used,
1561                                           rulla->timestamp, rulla->no_tries);
1562                         offset +=
1563                             sprintf(buf + offset,
1564                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1565                                     rulla->flags, rulla->packets_flooded,
1566                                     get_status_string(rulla->status));
1567                         printk("%s\n", buf);
1568                 }
1569         }
1570
1571         if (!hlist_empty(&priv->lec_no_forward))
1572                 printk("No forward\n");
1573         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1574                 offset = 0;
1575                 offset += sprintf(buf + offset, "Mac:");
1576                 for (j = 0; j < ETH_ALEN; j++) {
1577                         offset += sprintf(buf + offset, "%2.2x ",
1578                                           rulla->mac_addr[j] & 0xff);
1579                 }
1580                 offset += sprintf(buf + offset, "Atm:");
1581                 for (j = 0; j < ATM_ESA_LEN; j++) {
1582                         offset += sprintf(buf + offset, "%2.2x ",
1583                                           rulla->atm_addr[j] & 0xff);
1584                 }
1585                 offset += sprintf(buf + offset,
1586                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1587                                   rulla->vcc ? rulla->vcc->vpi : 0,
1588                                   rulla->vcc ? rulla->vcc->vci : 0,
1589                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1590                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1591                                   rulla->last_used,
1592                                   rulla->timestamp, rulla->no_tries);
1593                 offset += sprintf(buf + offset,
1594                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1595                                   rulla->flags, rulla->packets_flooded,
1596                                   get_status_string(rulla->status));
1597                 printk("%s\n", buf);
1598         }
1599
1600         if (!hlist_empty(&priv->lec_arp_empty_ones))
1601                 printk("Empty ones\n");
1602         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1603                 offset = 0;
1604                 offset += sprintf(buf + offset, "Mac:");
1605                 for (j = 0; j < ETH_ALEN; j++) {
1606                         offset += sprintf(buf + offset, "%2.2x ",
1607                                           rulla->mac_addr[j] & 0xff);
1608                 }
1609                 offset += sprintf(buf + offset, "Atm:");
1610                 for (j = 0; j < ATM_ESA_LEN; j++) {
1611                         offset += sprintf(buf + offset, "%2.2x ",
1612                                           rulla->atm_addr[j] & 0xff);
1613                 }
1614                 offset += sprintf(buf + offset,
1615                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1616                                   rulla->vcc ? rulla->vcc->vpi : 0,
1617                                   rulla->vcc ? rulla->vcc->vci : 0,
1618                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1619                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1620                                   rulla->last_used,
1621                                   rulla->timestamp, rulla->no_tries);
1622                 offset += sprintf(buf + offset,
1623                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1624                                   rulla->flags, rulla->packets_flooded,
1625                                   get_status_string(rulla->status));
1626                 printk("%s", buf);
1627         }
1628
1629         if (!hlist_empty(&priv->mcast_fwds))
1630                 printk("Multicast Forward VCCs\n");
1631         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1632                 offset = 0;
1633                 offset += sprintf(buf + offset, "Mac:");
1634                 for (j = 0; j < ETH_ALEN; j++) {
1635                         offset += sprintf(buf + offset, "%2.2x ",
1636                                           rulla->mac_addr[j] & 0xff);
1637                 }
1638                 offset += sprintf(buf + offset, "Atm:");
1639                 for (j = 0; j < ATM_ESA_LEN; j++) {
1640                         offset += sprintf(buf + offset, "%2.2x ",
1641                                           rulla->atm_addr[j] & 0xff);
1642                 }
1643                 offset += sprintf(buf + offset,
1644                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1645                                   rulla->vcc ? rulla->vcc->vpi : 0,
1646                                   rulla->vcc ? rulla->vcc->vci : 0,
1647                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1648                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1649                                   rulla->last_used,
1650                                   rulla->timestamp, rulla->no_tries);
1651                 offset += sprintf(buf + offset,
1652                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1653                                   rulla->flags, rulla->packets_flooded,
1654                                   get_status_string(rulla->status));
1655                 printk("%s\n", buf);
1656         }
1657
1658 }
1659 #else
1660 #define dump_arp_table(priv) do { } while (0)
1661 #endif
1662
1663 /*
1664  * Destruction of arp-cache
1665  */
1666 static void lec_arp_destroy(struct lec_priv *priv)
1667 {
1668         unsigned long flags;
1669         struct hlist_node *node, *next;
1670         struct lec_arp_table *entry;
1671         int i;
1672
1673         cancel_rearming_delayed_work(&priv->lec_arp_work);
1674
1675         /*
1676          * Remove all entries
1677          */
1678
1679         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1680         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1681                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1682                         lec_arp_remove(priv, entry);
1683                         lec_arp_put(entry);
1684                 }
1685                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1686         }
1687
1688         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1689                 del_timer_sync(&entry->timer);
1690                 lec_arp_clear_vccs(entry);
1691                 hlist_del(&entry->next);
1692                 lec_arp_put(entry);
1693         }
1694         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1695
1696         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1697                 del_timer_sync(&entry->timer);
1698                 lec_arp_clear_vccs(entry);
1699                 hlist_del(&entry->next);
1700                 lec_arp_put(entry);
1701         }
1702         INIT_HLIST_HEAD(&priv->lec_no_forward);
1703
1704         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1705                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1706                 lec_arp_clear_vccs(entry);
1707                 hlist_del(&entry->next);
1708                 lec_arp_put(entry);
1709         }
1710         INIT_HLIST_HEAD(&priv->mcast_fwds);
1711         priv->mcast_vcc = NULL;
1712         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1713 }
1714
1715 /*
1716  * Find entry by mac_address
1717  */
1718 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1719                                           const unsigned char *mac_addr)
1720 {
1721         struct hlist_node *node;
1722         struct hlist_head *head;
1723         struct lec_arp_table *entry;
1724
1725         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1726                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1727                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1728
1729         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1730         hlist_for_each_entry(entry, node, head, next) {
1731                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1732                         return entry;
1733                 }
1734         }
1735         return NULL;
1736 }
1737
1738 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1739                                         const unsigned char *mac_addr)
1740 {
1741         struct lec_arp_table *to_return;
1742
1743         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1744         if (!to_return) {
1745                 printk("LEC: Arp entry kmalloc failed\n");
1746                 return NULL;
1747         }
1748         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1749         INIT_HLIST_NODE(&to_return->next);
1750         setup_timer(&to_return->timer, lec_arp_expire_arp,
1751                         (unsigned long)to_return);
1752         to_return->last_used = jiffies;
1753         to_return->priv = priv;
1754         skb_queue_head_init(&to_return->tx_wait);
1755         atomic_set(&to_return->usage, 1);
1756         return to_return;
1757 }
1758
1759 /* Arp sent timer expired */
1760 static void lec_arp_expire_arp(unsigned long data)
1761 {
1762         struct lec_arp_table *entry;
1763
1764         entry = (struct lec_arp_table *)data;
1765
1766         pr_debug("lec_arp_expire_arp\n");
1767         if (entry->status == ESI_ARP_PENDING) {
1768                 if (entry->no_tries <= entry->priv->max_retry_count) {
1769                         if (entry->is_rdesc)
1770                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1771                                              entry->mac_addr, NULL, NULL);
1772                         else
1773                                 send_to_lecd(entry->priv, l_arp_xmt,
1774                                              entry->mac_addr, NULL, NULL);
1775                         entry->no_tries++;
1776                 }
1777                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1778         }
1779 }
1780
1781 /* Unknown/unused vcc expire, remove associated entry */
1782 static void lec_arp_expire_vcc(unsigned long data)
1783 {
1784         unsigned long flags;
1785         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1786         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1787
1788         del_timer(&to_remove->timer);
1789
1790         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1791                 to_remove, priv,
1792                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1793                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1794
1795         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1796         hlist_del(&to_remove->next);
1797         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1798
1799         lec_arp_clear_vccs(to_remove);
1800         lec_arp_put(to_remove);
1801 }
1802
1803 /*
1804  * Expire entries.
1805  * 1. Re-set timer
1806  * 2. For each entry, delete entries that have aged past the age limit.
1807  * 3. For each entry, depending on the status of the entry, perform
1808  *    the following maintenance.
1809  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1810  *       tick_count is above the max_unknown_frame_time, clear
1811  *       the tick_count to zero and clear the packets_flooded counter
1812  *       to zero. This supports the packet rate limit per address
1813  *       while flooding unknowns.
1814  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1815  *       than or equal to the path_switching_delay, change the status
1816  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1817  *       regardless of the progress of the flush protocol.
1818  */
1819 static void lec_arp_check_expire(struct work_struct *work)
1820 {
1821         unsigned long flags;
1822         struct lec_priv *priv =
1823                 container_of(work, struct lec_priv, lec_arp_work.work);
1824         struct hlist_node *node, *next;
1825         struct lec_arp_table *entry;
1826         unsigned long now;
1827         unsigned long time_to_check;
1828         int i;
1829
1830         pr_debug("lec_arp_check_expire %p\n", priv);
1831         now = jiffies;
1832 restart:
1833         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1834         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1835                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1836                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1837                             priv->topology_change)
1838                                 time_to_check = priv->forward_delay_time;
1839                         else
1840                                 time_to_check = priv->aging_time;
1841
1842                         pr_debug("About to expire: %lx - %lx > %lx\n",
1843                                 now, entry->last_used, time_to_check);
1844                         if (time_after(now, entry->last_used + time_to_check)
1845                             && !(entry->flags & LEC_PERMANENT_FLAG)
1846                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1847                                 /* Remove entry */
1848                                 pr_debug("LEC:Entry timed out\n");
1849                                 lec_arp_remove(priv, entry);
1850                                 lec_arp_put(entry);
1851                         } else {
1852                                 /* Something else */
1853                                 if ((entry->status == ESI_VC_PENDING ||
1854                                      entry->status == ESI_ARP_PENDING)
1855                                     && time_after_eq(now,
1856                                                      entry->timestamp +
1857                                                      priv->
1858                                                      max_unknown_frame_time)) {
1859                                         entry->timestamp = jiffies;
1860                                         entry->packets_flooded = 0;
1861                                         if (entry->status == ESI_VC_PENDING)
1862                                                 send_to_lecd(priv, l_svc_setup,
1863                                                              entry->mac_addr,
1864                                                              entry->atm_addr,
1865                                                              NULL);
1866                                 }
1867                                 if (entry->status == ESI_FLUSH_PENDING
1868                                     &&
1869                                     time_after_eq(now, entry->timestamp +
1870                                                   priv->path_switching_delay)) {
1871                                         struct sk_buff *skb;
1872                                         struct atm_vcc *vcc = entry->vcc;
1873
1874                                         lec_arp_hold(entry);
1875                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1876                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1877                                                 lec_send(vcc, skb);
1878                                         entry->last_used = jiffies;
1879                                         entry->status = ESI_FORWARD_DIRECT;
1880                                         lec_arp_put(entry);
1881                                         goto restart;
1882                                 }
1883                         }
1884                 }
1885         }
1886         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1887
1888         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1889 }
1890
1891 /*
1892  * Try to find vcc where mac_address is attached.
1893  *
1894  */
1895 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1896                                        const unsigned char *mac_to_find, int is_rdesc,
1897                                        struct lec_arp_table **ret_entry)
1898 {
1899         unsigned long flags;
1900         struct lec_arp_table *entry;
1901         struct atm_vcc *found;
1902
1903         if (mac_to_find[0] & 0x01) {
1904                 switch (priv->lane_version) {
1905                 case 1:
1906                         return priv->mcast_vcc;
1907                 case 2: /* LANE2 wants arp for multicast addresses */
1908                         if (!compare_ether_addr(mac_to_find, bus_mac))
1909                                 return priv->mcast_vcc;
1910                         break;
1911                 default:
1912                         break;
1913                 }
1914         }
1915
1916         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1917         entry = lec_arp_find(priv, mac_to_find);
1918
1919         if (entry) {
1920                 if (entry->status == ESI_FORWARD_DIRECT) {
1921                         /* Connection Ok */
1922                         entry->last_used = jiffies;
1923                         lec_arp_hold(entry);
1924                         *ret_entry = entry;
1925                         found = entry->vcc;
1926                         goto out;
1927                 }
1928                 /*
1929                  * If the LE_ARP cache entry is still pending, reset count to 0
1930                  * so another LE_ARP request can be made for this frame.
1931                  */
1932                 if (entry->status == ESI_ARP_PENDING) {
1933                         entry->no_tries = 0;
1934                 }
1935                 /*
1936                  * Data direct VC not yet set up, check to see if the unknown
1937                  * frame count is greater than the limit. If the limit has
1938                  * not been reached, allow the caller to send packet to
1939                  * BUS.
1940                  */
1941                 if (entry->status != ESI_FLUSH_PENDING &&
1942                     entry->packets_flooded <
1943                     priv->maximum_unknown_frame_count) {
1944                         entry->packets_flooded++;
1945                         pr_debug("LEC_ARP: Flooding..\n");
1946                         found = priv->mcast_vcc;
1947                         goto out;
1948                 }
1949                 /*
1950                  * We got here because entry->status == ESI_FLUSH_PENDING
1951                  * or BUS flood limit was reached for an entry which is
1952                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1953                  */
1954                 lec_arp_hold(entry);
1955                 *ret_entry = entry;
1956                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1957                         entry->vcc);
1958                 found = NULL;
1959         } else {
1960                 /* No matching entry was found */
1961                 entry = make_entry(priv, mac_to_find);
1962                 pr_debug("LEC_ARP: Making entry\n");
1963                 if (!entry) {
1964                         found = priv->mcast_vcc;
1965                         goto out;
1966                 }
1967                 lec_arp_add(priv, entry);
1968                 /* We want arp-request(s) to be sent */
1969                 entry->packets_flooded = 1;
1970                 entry->status = ESI_ARP_PENDING;
1971                 entry->no_tries = 1;
1972                 entry->last_used = entry->timestamp = jiffies;
1973                 entry->is_rdesc = is_rdesc;
1974                 if (entry->is_rdesc)
1975                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1976                                      NULL);
1977                 else
1978                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1979                 entry->timer.expires = jiffies + (1 * HZ);
1980                 entry->timer.function = lec_arp_expire_arp;
1981                 add_timer(&entry->timer);
1982                 found = priv->mcast_vcc;
1983         }
1984
1985 out:
1986         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1987         return found;
1988 }
1989
1990 static int
1991 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1992                 unsigned long permanent)
1993 {
1994         unsigned long flags;
1995         struct hlist_node *node, *next;
1996         struct lec_arp_table *entry;
1997         int i;
1998
1999         pr_debug("lec_addr_delete\n");
2000         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2001         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2002                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2003                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2004                             && (permanent ||
2005                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2006                                 lec_arp_remove(priv, entry);
2007                                 lec_arp_put(entry);
2008                         }
2009                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2010                         return 0;
2011                 }
2012         }
2013         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2014         return -1;
2015 }
2016
2017 /*
2018  * Notifies:  Response to arp_request (atm_addr != NULL)
2019  */
2020 static void
2021 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2022                const unsigned char *atm_addr, unsigned long remoteflag,
2023                unsigned int targetless_le_arp)
2024 {
2025         unsigned long flags;
2026         struct hlist_node *node, *next;
2027         struct lec_arp_table *entry, *tmp;
2028         int i;
2029
2030         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2031         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2032                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2033                 mac_addr[4], mac_addr[5]);
2034
2035         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2036         entry = lec_arp_find(priv, mac_addr);
2037         if (entry == NULL && targetless_le_arp)
2038                 goto out;       /*
2039                                  * LANE2: ignore targetless LE_ARPs for which
2040                                  * we have no entry in the cache. 7.1.30
2041                                  */
2042         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2043                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2044                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2045                                 hlist_del(&entry->next);
2046                                 del_timer(&entry->timer);
2047                                 tmp = lec_arp_find(priv, mac_addr);
2048                                 if (tmp) {
2049                                         del_timer(&tmp->timer);
2050                                         tmp->status = ESI_FORWARD_DIRECT;
2051                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2052                                         tmp->vcc = entry->vcc;
2053                                         tmp->old_push = entry->old_push;
2054                                         tmp->last_used = jiffies;
2055                                         del_timer(&entry->timer);
2056                                         lec_arp_put(entry);
2057                                         entry = tmp;
2058                                 } else {
2059                                         entry->status = ESI_FORWARD_DIRECT;
2060                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2061                                         entry->last_used = jiffies;
2062                                         lec_arp_add(priv, entry);
2063                                 }
2064                                 if (remoteflag)
2065                                         entry->flags |= LEC_REMOTE_FLAG;
2066                                 else
2067                                         entry->flags &= ~LEC_REMOTE_FLAG;
2068                                 pr_debug("After update\n");
2069                                 dump_arp_table(priv);
2070                                 goto out;
2071                         }
2072                 }
2073         }
2074
2075         entry = lec_arp_find(priv, mac_addr);
2076         if (!entry) {
2077                 entry = make_entry(priv, mac_addr);
2078                 if (!entry)
2079                         goto out;
2080                 entry->status = ESI_UNKNOWN;
2081                 lec_arp_add(priv, entry);
2082                 /* Temporary, changes before end of function */
2083         }
2084         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2085         del_timer(&entry->timer);
2086         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2087                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2088                         if (entry != tmp &&
2089                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2090                                 /* Vcc to this host exists */
2091                                 if (tmp->status > ESI_VC_PENDING) {
2092                                         /*
2093                                          * ESI_FLUSH_PENDING,
2094                                          * ESI_FORWARD_DIRECT
2095                                          */
2096                                         entry->vcc = tmp->vcc;
2097                                         entry->old_push = tmp->old_push;
2098                                 }
2099                                 entry->status = tmp->status;
2100                                 break;
2101                         }
2102                 }
2103         }
2104         if (remoteflag)
2105                 entry->flags |= LEC_REMOTE_FLAG;
2106         else
2107                 entry->flags &= ~LEC_REMOTE_FLAG;
2108         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2109                 entry->status = ESI_VC_PENDING;
2110                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2111         }
2112         pr_debug("After update2\n");
2113         dump_arp_table(priv);
2114 out:
2115         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2116 }
2117
2118 /*
2119  * Notifies: Vcc setup ready
2120  */
2121 static void
2122 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2123               struct atm_vcc *vcc,
2124               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2125 {
2126         unsigned long flags;
2127         struct hlist_node *node;
2128         struct lec_arp_table *entry;
2129         int i, found_entry = 0;
2130
2131         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2132         if (ioc_data->receive == 2) {
2133                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2134
2135                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2136 #if 0
2137                 entry = lec_arp_find(priv, bus_mac);
2138                 if (!entry) {
2139                         printk("LEC_ARP: Multicast entry not found!\n");
2140                         goto out;
2141                 }
2142                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2143                 entry->recv_vcc = vcc;
2144                 entry->old_recv_push = old_push;
2145 #endif
2146                 entry = make_entry(priv, bus_mac);
2147                 if (entry == NULL)
2148                         goto out;
2149                 del_timer(&entry->timer);
2150                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2151                 entry->recv_vcc = vcc;
2152                 entry->old_recv_push = old_push;
2153                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2154                 goto out;
2155         } else if (ioc_data->receive == 1) {
2156                 /*
2157                  * Vcc which we don't want to make default vcc,
2158                  * attach it anyway.
2159                  */
2160                 pr_debug
2161                     ("LEC_ARP:Attaching data direct, not default: "
2162                      "%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",
2163                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2164                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2165                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2166                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2167                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2168                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2169                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2170                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2171                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2172                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2173                 entry = make_entry(priv, bus_mac);
2174                 if (entry == NULL)
2175                         goto out;
2176                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2177                 memset(entry->mac_addr, 0, ETH_ALEN);
2178                 entry->recv_vcc = vcc;
2179                 entry->old_recv_push = old_push;
2180                 entry->status = ESI_UNKNOWN;
2181                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2182                 entry->timer.function = lec_arp_expire_vcc;
2183                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2184                 add_timer(&entry->timer);
2185                 dump_arp_table(priv);
2186                 goto out;
2187         }
2188         pr_debug
2189             ("LEC_ARP:Attaching data direct, default: "
2190              "%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",
2191              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2192              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2193              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2194              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2195              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2196              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2197              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2198              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2199              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2200              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2201         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2202                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2203                         if (memcmp
2204                             (ioc_data->atm_addr, entry->atm_addr,
2205                              ATM_ESA_LEN) == 0) {
2206                                 pr_debug("LEC_ARP: Attaching data direct\n");
2207                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2208                                         entry->vcc ? entry->vcc->vci : 0,
2209                                         entry->recv_vcc ? entry->recv_vcc->
2210                                         vci : 0);
2211                                 found_entry = 1;
2212                                 del_timer(&entry->timer);
2213                                 entry->vcc = vcc;
2214                                 entry->old_push = old_push;
2215                                 if (entry->status == ESI_VC_PENDING) {
2216                                         if (priv->maximum_unknown_frame_count
2217                                             == 0)
2218                                                 entry->status =
2219                                                     ESI_FORWARD_DIRECT;
2220                                         else {
2221                                                 entry->timestamp = jiffies;
2222                                                 entry->status =
2223                                                     ESI_FLUSH_PENDING;
2224 #if 0
2225                                                 send_to_lecd(priv, l_flush_xmt,
2226                                                              NULL,
2227                                                              entry->atm_addr,
2228                                                              NULL);
2229 #endif
2230                                         }
2231                                 } else {
2232                                         /*
2233                                          * They were forming a connection
2234                                          * to us, and we to them. Our
2235                                          * ATM address is numerically lower
2236                                          * than theirs, so we make connection
2237                                          * we formed into default VCC (8.1.11).
2238                                          * Connection they made gets torn
2239                                          * down. This might confuse some
2240                                          * clients. Can be changed if
2241                                          * someone reports trouble...
2242                                          */
2243                                         ;
2244                                 }
2245                         }
2246                 }
2247         }
2248         if (found_entry) {
2249                 pr_debug("After vcc was added\n");
2250                 dump_arp_table(priv);
2251                 goto out;
2252         }
2253         /*
2254          * Not found, snatch address from first data packet that arrives
2255          * from this vcc
2256          */
2257         entry = make_entry(priv, bus_mac);
2258         if (!entry)
2259                 goto out;
2260         entry->vcc = vcc;
2261         entry->old_push = old_push;
2262         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2263         memset(entry->mac_addr, 0, ETH_ALEN);
2264         entry->status = ESI_UNKNOWN;
2265         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2266         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2267         entry->timer.function = lec_arp_expire_vcc;
2268         add_timer(&entry->timer);
2269         pr_debug("After vcc was added\n");
2270         dump_arp_table(priv);
2271 out:
2272         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2273 }
2274
2275 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2276 {
2277         unsigned long flags;
2278         struct hlist_node *node;
2279         struct lec_arp_table *entry;
2280         int i;
2281
2282         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2283 restart:
2284         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2285         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2286                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2287                         if (entry->flush_tran_id == tran_id
2288                             && entry->status == ESI_FLUSH_PENDING) {
2289                                 struct sk_buff *skb;
2290                                 struct atm_vcc *vcc = entry->vcc;
2291
2292                                 lec_arp_hold(entry);
2293                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2294                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2295                                         lec_send(vcc, skb);
2296                                 entry->last_used = jiffies;
2297                                 entry->status = ESI_FORWARD_DIRECT;
2298                                 lec_arp_put(entry);
2299                                 pr_debug("LEC_ARP: Flushed\n");
2300                                 goto restart;
2301                         }
2302                 }
2303         }
2304         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2305         dump_arp_table(priv);
2306 }
2307
2308 static void
2309 lec_set_flush_tran_id(struct lec_priv *priv,
2310                       const unsigned char *atm_addr, unsigned long tran_id)
2311 {
2312         unsigned long flags;
2313         struct hlist_node *node;
2314         struct lec_arp_table *entry;
2315         int i;
2316
2317         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2318         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2319                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2320                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2321                                 entry->flush_tran_id = tran_id;
2322                                 pr_debug("Set flush transaction id to %lx for %p\n",
2323                                         tran_id, entry);
2324                         }
2325                 }
2326         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2327 }
2328
2329 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2330 {
2331         unsigned long flags;
2332         unsigned char mac_addr[] = {
2333                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2334         };
2335         struct lec_arp_table *to_add;
2336         struct lec_vcc_priv *vpriv;
2337         int err = 0;
2338
2339         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2340                 return -ENOMEM;
2341         vpriv->xoff = 0;
2342         vpriv->old_pop = vcc->pop;
2343         vcc->user_back = vpriv;
2344         vcc->pop = lec_pop;
2345         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2346         to_add = make_entry(priv, mac_addr);
2347         if (!to_add) {
2348                 vcc->pop = vpriv->old_pop;
2349                 kfree(vpriv);
2350                 err = -ENOMEM;
2351                 goto out;
2352         }
2353         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2354         to_add->status = ESI_FORWARD_DIRECT;
2355         to_add->flags |= LEC_PERMANENT_FLAG;
2356         to_add->vcc = vcc;
2357         to_add->old_push = vcc->push;
2358         vcc->push = lec_push;
2359         priv->mcast_vcc = vcc;
2360         lec_arp_add(priv, to_add);
2361 out:
2362         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2363         return err;
2364 }
2365
2366 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2367 {
2368         unsigned long flags;
2369         struct hlist_node *node, *next;
2370         struct lec_arp_table *entry;
2371         int i;
2372
2373         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2374         dump_arp_table(priv);
2375
2376         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2377
2378         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2379                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2380                         if (vcc == entry->vcc) {
2381                                 lec_arp_remove(priv, entry);
2382                                 lec_arp_put(entry);
2383                                 if (priv->mcast_vcc == vcc) {
2384                                         priv->mcast_vcc = NULL;
2385                                 }
2386                         }
2387                 }
2388         }
2389
2390         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2391                 if (entry->vcc == vcc) {
2392                         lec_arp_clear_vccs(entry);
2393                         del_timer(&entry->timer);
2394                         hlist_del(&entry->next);
2395                         lec_arp_put(entry);
2396                 }
2397         }
2398
2399         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2400                 if (entry->recv_vcc == vcc) {
2401                         lec_arp_clear_vccs(entry);
2402                         del_timer(&entry->timer);
2403                         hlist_del(&entry->next);
2404                         lec_arp_put(entry);
2405                 }
2406         }
2407
2408         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2409                 if (entry->recv_vcc == vcc) {
2410                         lec_arp_clear_vccs(entry);
2411                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2412                         hlist_del(&entry->next);
2413                         lec_arp_put(entry);
2414                 }
2415         }
2416
2417         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2418         dump_arp_table(priv);
2419 }
2420
2421 static void
2422 lec_arp_check_empties(struct lec_priv *priv,
2423                       struct atm_vcc *vcc, struct sk_buff *skb)
2424 {
2425         unsigned long flags;
2426         struct hlist_node *node, *next;
2427         struct lec_arp_table *entry, *tmp;
2428         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2429         unsigned char *src;
2430 #ifdef CONFIG_TR
2431         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2432
2433         if (priv->is_trdev)
2434                 src = tr_hdr->h_source;
2435         else
2436 #endif
2437                 src = hdr->h_source;
2438
2439         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2440         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2441                 if (vcc == entry->vcc) {
2442                         del_timer(&entry->timer);
2443                         memcpy(entry->mac_addr, src, ETH_ALEN);
2444                         entry->status = ESI_FORWARD_DIRECT;
2445                         entry->last_used = jiffies;
2446                         /* We might have got an entry */
2447                         if ((tmp = lec_arp_find(priv, src))) {
2448                                 lec_arp_remove(priv, tmp);
2449                                 lec_arp_put(tmp);
2450                         }
2451                         hlist_del(&entry->next);
2452                         lec_arp_add(priv, entry);
2453                         goto out;
2454                 }
2455         }
2456         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2457 out:
2458         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2459 }
2460
2461 MODULE_LICENSE("GPL");