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 <linux/if_bridge.h>
  38 #include "../bridge/br_private.h"
  39
  40 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
  41 #endif
  42
  43 /* Modular too */
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46
  47 #include "lec.h"
  48 #include "lec_arpc.h"
  49 #include "resources.h"
  50
  51 #define DUMP_PACKETS 0          /*
  52                                  * 0 = None,
  53                                  * 1 = 30 first bytes
  54                                  * 2 = Whole packet
  55                                  */
  56
  57 #define LEC_UNRES_QUE_LEN 8     /*
  58                                  * number of tx packets to queue for a
  59                                  * single destination while waiting for SVC
  60                                  */
  61
  62 static int lec_open(struct net_device *dev);
  63 static int lec_start_xmit(struct sk_buff *skb, 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 int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 252 {
 253         struct sk_buff *skb2;
 254         struct lec_priv *priv = netdev_priv(dev);
 255         struct lecdatahdr_8023 *lec_h;
 256         struct atm_vcc *vcc;
 257         struct lec_arp_table *entry;
 258         unsigned char *dst;
 259         int min_frame_size;
 260 #ifdef CONFIG_TR
 261         unsigned char rdesc[ETH_ALEN];  /* Token Ring route descriptor */
 262 #endif
 263         int is_rdesc;
 264 #if DUMP_PACKETS > 0
 265         char buf[300];
 266         int i = 0;
 267 #endif /* DUMP_PACKETS >0 */
 268
 269         pr_debug("lec_start_xmit called\n");
 270         if (!priv->lecd) {
 271                 printk("%s:No lecd attached\n", dev->name);
 272                 dev->stats.tx_errors++;
 273                 netif_stop_queue(dev);
 274                 return -EUNATCH;
 275         }
 276
 277         pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
 278                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
 279                 (long)skb_end_pointer(skb));
 280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 281         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
 282                 lec_handle_bridge(skb, dev);
 283 #endif
 284
 285         /* Make sure we have room for lec_id */
 286         if (skb_headroom(skb) < 2) {
 287
 288                 pr_debug("lec_start_xmit: reallocating skb\n");
 289                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 290                 kfree_skb(skb);
 291                 if (skb2 == NULL)
 292                         return 0;
 293                 skb = skb2;
 294         }
 295         skb_push(skb, 2);
 296
 297         /* Put le header to place, works for TokenRing too */
 298         lec_h = (struct lecdatahdr_8023 *)skb->data;
 299         lec_h->le_header = htons(priv->lecid);
 300
 301 #ifdef CONFIG_TR
 302         /*
 303          * Ugly. Use this to realign Token Ring packets for
 304          * e.g. PCA-200E driver.
 305          */
 306         if (priv->is_trdev) {
 307                 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
 308                 kfree_skb(skb);
 309                 if (skb2 == NULL)
 310                         return 0;
 311                 skb = skb2;
 312         }
 313 #endif
 314
 315 #if DUMP_PACKETS > 0
 316         printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
 317                skb->len, priv->lecid);
 318 #if DUMP_PACKETS >= 2
 319         for (i = 0; i < skb->len && i < 99; i++) {
 320                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 321         }
 322 #elif DUMP_PACKETS >= 1
 323         for (i = 0; i < skb->len && i < 30; i++) {
 324                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 325         }
 326 #endif /* DUMP_PACKETS >= 1 */
 327         if (i == skb->len)
 328                 printk("%s\n", buf);
 329         else
 330                 printk("%s...\n", buf);
 331 #endif /* DUMP_PACKETS > 0 */
 332
 333         /* Minimum ethernet-frame size */
 334 #ifdef CONFIG_TR
 335         if (priv->is_trdev)
 336                 min_frame_size = LEC_MINIMUM_8025_SIZE;
 337         else
 338 #endif
 339                 min_frame_size = LEC_MINIMUM_8023_SIZE;
 340         if (skb->len < min_frame_size) {
 341                 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
 342                         skb2 = skb_copy_expand(skb, 0,
 343                                                min_frame_size - skb->truesize,
 344                                                GFP_ATOMIC);
 345                         dev_kfree_skb(skb);
 346                         if (skb2 == NULL) {
 347                                 dev->stats.tx_dropped++;
 348                                 return 0;
 349                         }
 350                         skb = skb2;
 351                 }
 352                 skb_put(skb, min_frame_size - skb->len);
 353         }
 354
 355         /* Send to right vcc */
 356         is_rdesc = 0;
 357         dst = lec_h->h_dest;
 358 #ifdef CONFIG_TR
 359         if (priv->is_trdev) {
 360                 dst = get_tr_dst(skb->data + 2, rdesc);
 361                 if (dst == NULL) {
 362                         dst = rdesc;
 363                         is_rdesc = 1;
 364                 }
 365         }
 366 #endif
 367         entry = NULL;
 368         vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
 369         pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n", dev->name,
 370                 vcc, vcc ? vcc->flags : 0, entry);
 371         if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
 372                 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
 373                         pr_debug("%s:lec_start_xmit: queuing packet, ",
 374                                 dev->name);
 375                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 376                         skb_queue_tail(&entry->tx_wait, skb);
 377                 } else {
 378                         pr_debug
 379                             ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
 380                              dev->name);
 381                         pr_debug("MAC address %pM\n", lec_h->h_dest);
 382                         dev->stats.tx_dropped++;
 383                         dev_kfree_skb(skb);
 384                 }
 385                 goto out;
 386         }
 387 #if DUMP_PACKETS > 0
 388         printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
 389 #endif /* DUMP_PACKETS > 0 */
 390
 391         while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
 392                 pr_debug("lec.c: emptying tx queue, ");
 393                 pr_debug("MAC address %pM\n", lec_h->h_dest);
 394                 lec_send(vcc, skb2);
 395         }
 396
 397         lec_send(vcc, skb);
 398
 399         if (!atm_may_send(vcc, 0)) {
 400                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 401
 402                 vpriv->xoff = 1;
 403                 netif_stop_queue(dev);
 404
 405                 /*
 406                  * vcc->pop() might have occurred in between, making
 407                  * the vcc usuable again.  Since xmit is serialized,
 408                  * this is the only situation we have to re-test.
 409                  */
 410
 411                 if (atm_may_send(vcc, 0))
 412                         netif_wake_queue(dev);
 413         }
 414
 415 out:
 416         if (entry)
 417                 lec_arp_put(entry);
 418         dev->trans_start = jiffies;
 419         return 0;
 420 }
 421
 422 /* The inverse routine to net_open(). */
 423 static int lec_close(struct net_device *dev)
 424 {
 425         netif_stop_queue(dev);
 426         return 0;
 427 }
 428
 429 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 430 {
 431         unsigned long flags;
 432         struct net_device *dev = (struct net_device *)vcc->proto_data;
 433         struct lec_priv *priv = netdev_priv(dev);
 434         struct atmlec_msg *mesg;
 435         struct lec_arp_table *entry;
 436         int i;
 437         char *tmp;              /* FIXME */
 438
 439         atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 440         mesg = (struct atmlec_msg *)skb->data;
 441         tmp = skb->data;
 442         tmp += sizeof(struct atmlec_msg);
 443         pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
 444         switch (mesg->type) {
 445         case l_set_mac_addr:
 446                 for (i = 0; i < 6; i++) {
 447                         dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
 448                 }
 449                 break;
 450         case l_del_mac_addr:
 451                 for (i = 0; i < 6; i++) {
 452                         dev->dev_addr[i] = 0;
 453                 }
 454                 break;
 455         case l_addr_delete:
 456                 lec_addr_delete(priv, mesg->content.normal.atm_addr,
 457                                 mesg->content.normal.flag);
 458                 break;
 459         case l_topology_change:
 460                 priv->topology_change = mesg->content.normal.flag;
 461                 break;
 462         case l_flush_complete:
 463                 lec_flush_complete(priv, mesg->content.normal.flag);
 464                 break;
 465         case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
 466                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 467                 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
 468                 lec_arp_remove(priv, entry);
 469                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 470
 471                 if (mesg->content.normal.no_source_le_narp)
 472                         break;
 473                 /* FALL THROUGH */
 474         case l_arp_update:
 475                 lec_arp_update(priv, mesg->content.normal.mac_addr,
 476                                mesg->content.normal.atm_addr,
 477                                mesg->content.normal.flag,
 478                                mesg->content.normal.targetless_le_arp);
 479                 pr_debug("lec: in l_arp_update\n");
 480                 if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
 481                         pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
 482                                 mesg->sizeoftlvs);
 483                         lane2_associate_ind(dev, mesg->content.normal.mac_addr,
 484                                             tmp, mesg->sizeoftlvs);
 485                 }
 486                 break;
 487         case l_config:
 488                 priv->maximum_unknown_frame_count =
 489                     mesg->content.config.maximum_unknown_frame_count;
 490                 priv->max_unknown_frame_time =
 491                     (mesg->content.config.max_unknown_frame_time * HZ);
 492                 priv->max_retry_count = mesg->content.config.max_retry_count;
 493                 priv->aging_time = (mesg->content.config.aging_time * HZ);
 494                 priv->forward_delay_time =
 495                     (mesg->content.config.forward_delay_time * HZ);
 496                 priv->arp_response_time =
 497                     (mesg->content.config.arp_response_time * HZ);
 498                 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
 499                 priv->path_switching_delay =
 500                     (mesg->content.config.path_switching_delay * HZ);
 501                 priv->lane_version = mesg->content.config.lane_version; /* LANE2 */
 502                 priv->lane2_ops = NULL;
 503                 if (priv->lane_version > 1)
 504                         priv->lane2_ops = &lane2_ops;
 505                 if (dev_set_mtu(dev, mesg->content.config.mtu))
 506                         printk("%s: change_mtu to %d failed\n", dev->name,
 507                                mesg->content.config.mtu);
 508                 priv->is_proxy = mesg->content.config.is_proxy;
 509                 break;
 510         case l_flush_tran_id:
 511                 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
 512                                       mesg->content.normal.flag);
 513                 break;
 514         case l_set_lecid:
 515                 priv->lecid =
 516                     (unsigned short)(0xffff & mesg->content.normal.flag);
 517                 break;
 518         case l_should_bridge:
 519 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 520                 {
 521                         struct net_bridge_fdb_entry *f;
 522
 523                         pr_debug("%s: bridge zeppelin asks about %pM\n",
 524                                  dev->name, mesg->content.proxy.mac_addr);
 525
 526                         if (br_fdb_get_hook == NULL || dev->br_port == NULL)
 527                                 break;
 528
 529                         f = br_fdb_get_hook(dev->br_port->br,
 530                                             mesg->content.proxy.mac_addr);
 531                         if (f != NULL && f->dst->dev != dev
 532                             && f->dst->state == BR_STATE_FORWARDING) {
 533                                 /* hit from bridge table, send LE_ARP_RESPONSE */
 534                                 struct sk_buff *skb2;
 535                                 struct sock *sk;
 536
 537                                 pr_debug
 538                                     ("%s: entry found, responding to zeppelin\n",
 539                                      dev->name);
 540                                 skb2 =
 541                                     alloc_skb(sizeof(struct atmlec_msg),
 542                                               GFP_ATOMIC);
 543                                 if (skb2 == NULL) {
 544                                         br_fdb_put_hook(f);
 545                                         break;
 546                                 }
 547                                 skb2->len = sizeof(struct atmlec_msg);
 548                                 skb_copy_to_linear_data(skb2, mesg,
 549                                                         sizeof(*mesg));
 550                                 atm_force_charge(priv->lecd, skb2->truesize);
 551                                 sk = sk_atm(priv->lecd);
 552                                 skb_queue_tail(&sk->sk_receive_queue, skb2);
 553                                 sk->sk_data_ready(sk, skb2->len);
 554                         }
 555                         if (f != NULL)
 556                                 br_fdb_put_hook(f);
 557                 }
 558 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
 559                 break;
 560         default:
 561                 printk("%s: Unknown message type %d\n", dev->name, mesg->type);
 562                 dev_kfree_skb(skb);
 563                 return -EINVAL;
 564         }
 565         dev_kfree_skb(skb);
 566         return 0;
 567 }
 568
 569 static void lec_atm_close(struct atm_vcc *vcc)
 570 {
 571         struct sk_buff *skb;
 572         struct net_device *dev = (struct net_device *)vcc->proto_data;
 573         struct lec_priv *priv = netdev_priv(dev);
 574
 575         priv->lecd = NULL;
 576         /* Do something needful? */
 577
 578         netif_stop_queue(dev);
 579         lec_arp_destroy(priv);
 580
 581         if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
 582                 printk("%s lec_atm_close: closing with messages pending\n",
 583                        dev->name);
 584         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
 585                 atm_return(vcc, skb->truesize);
 586                 dev_kfree_skb(skb);
 587         }
 588
 589         printk("%s: Shut down!\n", dev->name);
 590         module_put(THIS_MODULE);
 591 }
 592
 593 static struct atmdev_ops lecdev_ops = {
 594         .close = lec_atm_close,
 595         .send = lec_atm_send
 596 };
 597
 598 static struct atm_dev lecatm_dev = {
 599         .ops = &lecdev_ops,
 600         .type = "lec",
 601         .number = 999,          /* dummy device number */
 602         .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
 603 };
 604
 605 /*
 606  * LANE2: new argument struct sk_buff *data contains
 607  * the LE_ARP based TLVs introduced in the LANE2 spec
 608  */
 609 static int
 610 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
 611              const unsigned char *mac_addr, const unsigned char *atm_addr,
 612              struct sk_buff *data)
 613 {
 614         struct sock *sk;
 615         struct sk_buff *skb;
 616         struct atmlec_msg *mesg;
 617
 618         if (!priv || !priv->lecd) {
 619                 return -1;
 620         }
 621         skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
 622         if (!skb)
 623                 return -1;
 624         skb->len = sizeof(struct atmlec_msg);
 625         mesg = (struct atmlec_msg *)skb->data;
 626         memset(mesg, 0, sizeof(struct atmlec_msg));
 627         mesg->type = type;
 628         if (data != NULL)
 629                 mesg->sizeoftlvs = data->len;
 630         if (mac_addr)
 631                 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
 632         else
 633                 mesg->content.normal.targetless_le_arp = 1;
 634         if (atm_addr)
 635                 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
 636
 637         atm_force_charge(priv->lecd, skb->truesize);
 638         sk = sk_atm(priv->lecd);
 639         skb_queue_tail(&sk->sk_receive_queue, skb);
 640         sk->sk_data_ready(sk, skb->len);
 641
 642         if (data != NULL) {
 643                 pr_debug("lec: about to send %d bytes of data\n", data->len);
 644                 atm_force_charge(priv->lecd, data->truesize);
 645                 skb_queue_tail(&sk->sk_receive_queue, data);
 646                 sk->sk_data_ready(sk, skb->len);
 647         }
 648
 649         return 0;
 650 }
 651
 652 /* shamelessly stolen from drivers/net/net_init.c */
 653 static int lec_change_mtu(struct net_device *dev, int new_mtu)
 654 {
 655         if ((new_mtu < 68) || (new_mtu > 18190))
 656                 return -EINVAL;
 657         dev->mtu = new_mtu;
 658         return 0;
 659 }
 660
 661 static void lec_set_multicast_list(struct net_device *dev)
 662 {
 663         /*
 664          * by default, all multicast frames arrive over the bus.
 665          * eventually support selective multicast service
 666          */
 667         return;
 668 }
 669
 670 static const struct net_device_ops lec_netdev_ops = {
 671         .ndo_open               = lec_open,
 672         .ndo_stop               = lec_close,
 673         .ndo_start_xmit         = lec_start_xmit,
 674         .ndo_change_mtu         = lec_change_mtu,
 675         .ndo_tx_timeout         = lec_tx_timeout,
 676         .ndo_set_multicast_list = lec_set_multicast_list,
 677 };
 678
 679
 680 static void lec_init(struct net_device *dev)
 681 {
 682         dev->netdev_ops = &lec_netdev_ops;
 683         printk("%s: Initialized!\n", dev->name);
 684 }
 685
 686 static const unsigned char lec_ctrl_magic[] = {
 687         0xff,
 688         0x00,
 689         0x01,
 690         0x01
 691 };
 692
 693 #define LEC_DATA_DIRECT_8023  2
 694 #define LEC_DATA_DIRECT_8025  3
 695
 696 static int lec_is_data_direct(struct atm_vcc *vcc)
 697 {
 698         return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
 699                 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
 700 }
 701
 702 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
 703 {
 704         unsigned long flags;
 705         struct net_device *dev = (struct net_device *)vcc->proto_data;
 706         struct lec_priv *priv = netdev_priv(dev);
 707
 708 #if DUMP_PACKETS >0
 709         int i = 0;
 710         char buf[300];
 711
 712         printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
 713                vcc->vpi, vcc->vci);
 714 #endif
 715         if (!skb) {
 716                 pr_debug("%s: null skb\n", dev->name);
 717                 lec_vcc_close(priv, vcc);
 718                 return;
 719         }
 720 #if DUMP_PACKETS > 0
 721         printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
 722                skb->len, priv->lecid);
 723 #if DUMP_PACKETS >= 2
 724         for (i = 0; i < skb->len && i < 99; i++) {
 725                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 726         }
 727 #elif DUMP_PACKETS >= 1
 728         for (i = 0; i < skb->len && i < 30; i++) {
 729                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
 730         }
 731 #endif /* DUMP_PACKETS >= 1 */
 732         if (i == skb->len)
 733                 printk("%s\n", buf);
 734         else
 735                 printk("%s...\n", buf);
 736 #endif /* DUMP_PACKETS > 0 */
 737         if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {        /* Control frame, to daemon */
 738                 struct sock *sk = sk_atm(vcc);
 739
 740                 pr_debug("%s: To daemon\n", dev->name);
 741                 skb_queue_tail(&sk->sk_receive_queue, skb);
 742                 sk->sk_data_ready(sk, skb->len);
 743         } else {                /* Data frame, queue to protocol handlers */
 744                 struct lec_arp_table *entry;
 745                 unsigned char *src, *dst;
 746
 747                 atm_return(vcc, skb->truesize);
 748                 if (*(__be16 *) skb->data == htons(priv->lecid) ||
 749                     !priv->lecd || !(dev->flags & IFF_UP)) {
 750                         /*
 751                          * Probably looping back, or if lecd is missing,
 752                          * lecd has gone down
 753                          */
 754                         pr_debug("Ignoring frame...\n");
 755                         dev_kfree_skb(skb);
 756                         return;
 757                 }
 758 #ifdef CONFIG_TR
 759                 if (priv->is_trdev)
 760                         dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
 761                 else
 762 #endif
 763                         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
 764
 765                 /*
 766                  * If this is a Data Direct VCC, and the VCC does not match
 767                  * the LE_ARP cache entry, delete the LE_ARP cache entry.
 768                  */
 769                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
 770                 if (lec_is_data_direct(vcc)) {
 771 #ifdef CONFIG_TR
 772                         if (priv->is_trdev)
 773                                 src =
 774                                     ((struct lecdatahdr_8025 *)skb->data)->
 775                                     h_source;
 776                         else
 777 #endif
 778                                 src =
 779                                     ((struct lecdatahdr_8023 *)skb->data)->
 780                                     h_source;
 781                         entry = lec_arp_find(priv, src);
 782                         if (entry && entry->vcc != vcc) {
 783                                 lec_arp_remove(priv, entry);
 784                                 lec_arp_put(entry);
 785                         }
 786                 }
 787                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
 788
 789                 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
 790                     !priv->is_proxy &&  /* Proxy wants all the packets */
 791                     memcmp(dst, dev->dev_addr, dev->addr_len)) {
 792                         dev_kfree_skb(skb);
 793                         return;
 794                 }
 795                 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
 796                         lec_arp_check_empties(priv, vcc, skb);
 797                 }
 798                 skb_pull(skb, 2);       /* skip lec_id */
 799 #ifdef CONFIG_TR
 800                 if (priv->is_trdev)
 801                         skb->protocol = tr_type_trans(skb, dev);
 802                 else
 803 #endif
 804                         skb->protocol = eth_type_trans(skb, dev);
 805                 dev->stats.rx_packets++;
 806                 dev->stats.rx_bytes += skb->len;
 807                 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 808                 netif_rx(skb);
 809         }
 810 }
 811
 812 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 813 {
 814         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
 815         struct net_device *dev = skb->dev;
 816
 817         if (vpriv == NULL) {
 818                 printk("lec_pop(): vpriv = NULL!?!?!?\n");
 819                 return;
 820         }
 821
 822         vpriv->old_pop(vcc, skb);
 823
 824         if (vpriv->xoff && atm_may_send(vcc, 0)) {
 825                 vpriv->xoff = 0;
 826                 if (netif_running(dev) && netif_queue_stopped(dev))
 827                         netif_wake_queue(dev);
 828         }
 829 }
 830
 831 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 832 {
 833         struct lec_vcc_priv *vpriv;
 834         int bytes_left;
 835         struct atmlec_ioc ioc_data;
 836
 837         /* Lecd must be up in this case */
 838         bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 839         if (bytes_left != 0) {
 840                 printk
 841                     ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
 842                      bytes_left);
 843         }
 844         if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
 845             !dev_lec[ioc_data.dev_num])
 846                 return -EINVAL;
 847         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
 848                 return -ENOMEM;
 849         vpriv->xoff = 0;
 850         vpriv->old_pop = vcc->pop;
 851         vcc->user_back = vpriv;
 852         vcc->pop = lec_pop;
 853         lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
 854                       &ioc_data, vcc, vcc->push);
 855         vcc->proto_data = dev_lec[ioc_data.dev_num];
 856         vcc->push = lec_push;
 857         return 0;
 858 }
 859
 860 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
 861 {
 862         if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
 863                 return -EINVAL;
 864         vcc->proto_data = dev_lec[arg];
 865         return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
 866                                 vcc);
 867 }
 868
 869 /* Initialize device. */
 870 static int lecd_attach(struct atm_vcc *vcc, int arg)
 871 {
 872         int i;
 873         struct lec_priv *priv;
 874
 875         if (arg < 0)
 876                 i = 0;
 877         else
 878                 i = arg;
 879 #ifdef CONFIG_TR
 880         if (arg >= MAX_LEC_ITF)
 881                 return -EINVAL;
 882 #else                           /* Reserve the top NUM_TR_DEVS for TR */
 883         if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
 884                 return -EINVAL;
 885 #endif
 886         if (!dev_lec[i]) {
 887                 int is_trdev, size;
 888
 889                 is_trdev = 0;
 890                 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
 891                         is_trdev = 1;
 892
 893                 size = sizeof(struct lec_priv);
 894 #ifdef CONFIG_TR
 895                 if (is_trdev)
 896                         dev_lec[i] = alloc_trdev(size);
 897                 else
 898 #endif
 899                         dev_lec[i] = alloc_etherdev(size);
 900                 if (!dev_lec[i])
 901                         return -ENOMEM;
 902                 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 903                 if (register_netdev(dev_lec[i])) {
 904                         free_netdev(dev_lec[i]);
 905                         return -EINVAL;
 906                 }
 907
 908                 priv = netdev_priv(dev_lec[i]);
 909                 priv->is_trdev = is_trdev;
 910                 lec_init(dev_lec[i]);
 911         } else {
 912                 priv = netdev_priv(dev_lec[i]);
 913                 if (priv->lecd)
 914                         return -EADDRINUSE;
 915         }
 916         lec_arp_init(priv);
 917         priv->itfnum = i;       /* LANE2 addition */
 918         priv->lecd = vcc;
 919         vcc->dev = &lecatm_dev;
 920         vcc_insert_socket(sk_atm(vcc));
 921
 922         vcc->proto_data = dev_lec[i];
 923         set_bit(ATM_VF_META, &vcc->flags);
 924         set_bit(ATM_VF_READY, &vcc->flags);
 925
 926         /* Set default values to these variables */
 927         priv->maximum_unknown_frame_count = 1;
 928         priv->max_unknown_frame_time = (1 * HZ);
 929         priv->vcc_timeout_period = (1200 * HZ);
 930         priv->max_retry_count = 1;
 931         priv->aging_time = (300 * HZ);
 932         priv->forward_delay_time = (15 * HZ);
 933         priv->topology_change = 0;
 934         priv->arp_response_time = (1 * HZ);
 935         priv->flush_timeout = (4 * HZ);
 936         priv->path_switching_delay = (6 * HZ);
 937
 938         if (dev_lec[i]->flags & IFF_UP) {
 939                 netif_start_queue(dev_lec[i]);
 940         }
 941         __module_get(THIS_MODULE);
 942         return i;
 943 }
 944
 945 #ifdef CONFIG_PROC_FS
 946 static char *lec_arp_get_status_string(unsigned char status)
 947 {
 948         static char *lec_arp_status_string[] = {
 949                 "ESI_UNKNOWN       ",
 950                 "ESI_ARP_PENDING   ",
 951                 "ESI_VC_PENDING    ",
 952                 "<Undefined>       ",
 953                 "ESI_FLUSH_PENDING ",
 954                 "ESI_FORWARD_DIRECT"
 955         };
 956
 957         if (status > ESI_FORWARD_DIRECT)
 958                 status = 3;     /* ESI_UNDEFINED */
 959         return lec_arp_status_string[status];
 960 }
 961
 962 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
 963 {
 964         int i;
 965
 966         for (i = 0; i < ETH_ALEN; i++)
 967                 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
 968         seq_printf(seq, " ");
 969         for (i = 0; i < ATM_ESA_LEN; i++)
 970                 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
 971         seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
 972                    entry->flags & 0xffff);
 973         if (entry->vcc)
 974                 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
 975         else
 976                 seq_printf(seq, "        ");
 977         if (entry->recv_vcc) {
 978                 seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
 979                            entry->recv_vcc->vci);
 980         }
 981         seq_putc(seq, '\n');
 982 }
 983
 984 struct lec_state {
 985         unsigned long flags;
 986         struct lec_priv *locked;
 987         struct hlist_node *node;
 988         struct net_device *dev;
 989         int itf;
 990         int arp_table;
 991         int misc_table;
 992 };
 993
 994 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
 995                           loff_t *l)
 996 {
 997         struct hlist_node *e = state->node;
 998         struct lec_arp_table *tmp;
 999
1000         if (!e)
1001                 e = tbl->first;
1002         if (e == SEQ_START_TOKEN) {
1003                 e = tbl->first;
1004                 --*l;
1005         }
1006
1007         hlist_for_each_entry_from(tmp, e, next) {
1008                 if (--*l < 0)
1009                         break;
1010         }
1011         state->node = e;
1012
1013         return (*l < 0) ? state : NULL;
1014 }
1015
1016 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
1017                           struct lec_priv *priv)
1018 {
1019         void *v = NULL;
1020         int p;
1021
1022         for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
1023                 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
1024                 if (v)
1025                         break;
1026         }
1027         state->arp_table = p;
1028         return v;
1029 }
1030
1031 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
1032                            struct lec_priv *priv)
1033 {
1034         struct hlist_head *lec_misc_tables[] = {
1035                 &priv->lec_arp_empty_ones,
1036                 &priv->lec_no_forward,
1037                 &priv->mcast_fwds
1038         };
1039         void *v = NULL;
1040         int q;
1041
1042         for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1043                 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1044                 if (v)
1045                         break;
1046         }
1047         state->misc_table = q;
1048         return v;
1049 }
1050
1051 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1052                            struct lec_priv *priv)
1053 {
1054         if (!state->locked) {
1055                 state->locked = priv;
1056                 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1057         }
1058         if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1059                 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1060                 state->locked = NULL;
1061                 /* Partial state reset for the next time we get called */
1062                 state->arp_table = state->misc_table = 0;
1063         }
1064         return state->locked;
1065 }
1066
1067 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1068 {
1069         struct net_device *dev;
1070         void *v;
1071
1072         dev = state->dev ? state->dev : dev_lec[state->itf];
1073         v = (dev && netdev_priv(dev)) ?
1074                 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1075         if (!v && dev) {
1076                 dev_put(dev);
1077                 /* Partial state reset for the next time we get called */
1078                 dev = NULL;
1079         }
1080         state->dev = dev;
1081         return v;
1082 }
1083
1084 static void *lec_get_idx(struct lec_state *state, loff_t l)
1085 {
1086         void *v = NULL;
1087
1088         for (; state->itf < MAX_LEC_ITF; state->itf++) {
1089                 v = lec_itf_walk(state, &l);
1090                 if (v)
1091                         break;
1092         }
1093         return v;
1094 }
1095
1096 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1097 {
1098         struct lec_state *state = seq->private;
1099
1100         state->itf = 0;
1101         state->dev = NULL;
1102         state->locked = NULL;
1103         state->arp_table = 0;
1104         state->misc_table = 0;
1105         state->node = SEQ_START_TOKEN;
1106
1107         return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1108 }
1109
1110 static void lec_seq_stop(struct seq_file *seq, void *v)
1111 {
1112         struct lec_state *state = seq->private;
1113
1114         if (state->dev) {
1115                 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1116                                        state->flags);
1117                 dev_put(state->dev);
1118         }
1119 }
1120
1121 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1122 {
1123         struct lec_state *state = seq->private;
1124
1125         v = lec_get_idx(state, 1);
1126         *pos += !!PTR_ERR(v);
1127         return v;
1128 }
1129
1130 static int lec_seq_show(struct seq_file *seq, void *v)
1131 {
1132         static char lec_banner[] = "Itf  MAC          ATM destination"
1133             "                          Status            Flags "
1134             "VPI/VCI Recv VPI/VCI\n";
1135
1136         if (v == SEQ_START_TOKEN)
1137                 seq_puts(seq, lec_banner);
1138         else {
1139                 struct lec_state *state = seq->private;
1140                 struct net_device *dev = state->dev;
1141                 struct lec_arp_table *entry = hlist_entry(state->node, struct lec_arp_table, next);
1142
1143                 seq_printf(seq, "%s ", dev->name);
1144                 lec_info(seq, entry);
1145         }
1146         return 0;
1147 }
1148
1149 static const struct seq_operations lec_seq_ops = {
1150         .start = lec_seq_start,
1151         .next = lec_seq_next,
1152         .stop = lec_seq_stop,
1153         .show = lec_seq_show,
1154 };
1155
1156 static int lec_seq_open(struct inode *inode, struct file *file)
1157 {
1158         return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1159 }
1160
1161 static const struct file_operations lec_seq_fops = {
1162         .owner = THIS_MODULE,
1163         .open = lec_seq_open,
1164         .read = seq_read,
1165         .llseek = seq_lseek,
1166         .release = seq_release_private,
1167 };
1168 #endif
1169
1170 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1171 {
1172         struct atm_vcc *vcc = ATM_SD(sock);
1173         int err = 0;
1174
1175         switch (cmd) {
1176         case ATMLEC_CTRL:
1177         case ATMLEC_MCAST:
1178         case ATMLEC_DATA:
1179                 if (!capable(CAP_NET_ADMIN))
1180                         return -EPERM;
1181                 break;
1182         default:
1183                 return -ENOIOCTLCMD;
1184         }
1185
1186         switch (cmd) {
1187         case ATMLEC_CTRL:
1188                 err = lecd_attach(vcc, (int)arg);
1189                 if (err >= 0)
1190                         sock->state = SS_CONNECTED;
1191                 break;
1192         case ATMLEC_MCAST:
1193                 err = lec_mcast_attach(vcc, (int)arg);
1194                 break;
1195         case ATMLEC_DATA:
1196                 err = lec_vcc_attach(vcc, (void __user *)arg);
1197                 break;
1198         }
1199
1200         return err;
1201 }
1202
1203 static struct atm_ioctl lane_ioctl_ops = {
1204         .owner = THIS_MODULE,
1205         .ioctl = lane_ioctl,
1206 };
1207
1208 static int __init lane_module_init(void)
1209 {
1210 #ifdef CONFIG_PROC_FS
1211         struct proc_dir_entry *p;
1212
1213         p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1214         if (!p) {
1215                 printk(KERN_ERR "Unable to initialize /proc/net/atm/lec\n");
1216                 return -ENOMEM;
1217         }
1218 #endif
1219
1220         register_atm_ioctl(&lane_ioctl_ops);
1221         printk("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1222         return 0;
1223 }
1224
1225 static void __exit lane_module_cleanup(void)
1226 {
1227         int i;
1228         struct lec_priv *priv;
1229
1230         remove_proc_entry("lec", atm_proc_root);
1231
1232         deregister_atm_ioctl(&lane_ioctl_ops);
1233
1234         for (i = 0; i < MAX_LEC_ITF; i++) {
1235                 if (dev_lec[i] != NULL) {
1236                         priv = netdev_priv(dev_lec[i]);
1237                         unregister_netdev(dev_lec[i]);
1238                         free_netdev(dev_lec[i]);
1239                         dev_lec[i] = NULL;
1240                 }
1241         }
1242
1243         return;
1244 }
1245
1246 module_init(lane_module_init);
1247 module_exit(lane_module_cleanup);
1248
1249 /*
1250  * LANE2: 3.1.3, LE_RESOLVE.request
1251  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1252  * If sizeoftlvs == NULL the default TLVs associated with with this
1253  * lec will be used.
1254  * If dst_mac == NULL, targetless LE_ARP will be sent
1255  */
1256 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1257                          u8 **tlvs, u32 *sizeoftlvs)
1258 {
1259         unsigned long flags;
1260         struct lec_priv *priv = netdev_priv(dev);
1261         struct lec_arp_table *table;
1262         struct sk_buff *skb;
1263         int retval;
1264
1265         if (force == 0) {
1266                 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1267                 table = lec_arp_find(priv, dst_mac);
1268                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1269                 if (table == NULL)
1270                         return -1;
1271
1272                 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1273                 if (*tlvs == NULL)
1274                         return -1;
1275
1276                 *sizeoftlvs = table->sizeoftlvs;
1277
1278                 return 0;
1279         }
1280
1281         if (sizeoftlvs == NULL)
1282                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1283
1284         else {
1285                 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1286                 if (skb == NULL)
1287                         return -1;
1288                 skb->len = *sizeoftlvs;
1289                 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1290                 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1291         }
1292         return retval;
1293 }
1294
1295 /*
1296  * LANE2: 3.1.4, LE_ASSOCIATE.request
1297  * Associate the *tlvs with the *lan_dst address.
1298  * Will overwrite any previous association
1299  * Returns 1 for success, 0 for failure (out of memory)
1300  *
1301  */
1302 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1303                                const u8 *tlvs, u32 sizeoftlvs)
1304 {
1305         int retval;
1306         struct sk_buff *skb;
1307         struct lec_priv *priv = netdev_priv(dev);
1308
1309         if (compare_ether_addr(lan_dst, dev->dev_addr))
1310                 return (0);     /* not our mac address */
1311
1312         kfree(priv->tlvs);      /* NULL if there was no previous association */
1313
1314         priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1315         if (priv->tlvs == NULL)
1316                 return (0);
1317         priv->sizeoftlvs = sizeoftlvs;
1318
1319         skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1320         if (skb == NULL)
1321                 return 0;
1322         skb->len = sizeoftlvs;
1323         skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1324         retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1325         if (retval != 0)
1326                 printk("lec.c: lane2_associate_req() failed\n");
1327         /*
1328          * If the previous association has changed we must
1329          * somehow notify other LANE entities about the change
1330          */
1331         return (1);
1332 }
1333
1334 /*
1335  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1336  *
1337  */
1338 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1339                                 const u8 *tlvs, u32 sizeoftlvs)
1340 {
1341 #if 0
1342         int i = 0;
1343 #endif
1344         struct lec_priv *priv = netdev_priv(dev);
1345 #if 0                           /*
1346                                  * Why have the TLVs in LE_ARP entries
1347                                  * since we do not use them? When you
1348                                  * uncomment this code, make sure the
1349                                  * TLVs get freed when entry is killed
1350                                  */
1351         struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1352
1353         if (entry == NULL)
1354                 return;         /* should not happen */
1355
1356         kfree(entry->tlvs);
1357
1358         entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1359         if (entry->tlvs == NULL)
1360                 return;
1361         entry->sizeoftlvs = sizeoftlvs;
1362 #endif
1363 #if 0
1364         printk("lec.c: lane2_associate_ind()\n");
1365         printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1366         while (i < sizeoftlvs)
1367                 printk("%02x ", tlvs[i++]);
1368
1369         printk("\n");
1370 #endif
1371
1372         /* tell MPOA about the TLVs we saw */
1373         if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1374                 priv->lane2_ops->associate_indicator(dev, mac_addr,
1375                                                      tlvs, sizeoftlvs);
1376         }
1377         return;
1378 }
1379
1380 /*
1381  * Here starts what used to lec_arpc.c
1382  *
1383  * lec_arpc.c was added here when making
1384  * lane client modular. October 1997
1385  */
1386
1387 #include <linux/types.h>
1388 #include <linux/timer.h>
1389 #include <asm/param.h>
1390 #include <asm/atomic.h>
1391 #include <linux/inetdevice.h>
1392 #include <net/route.h>
1393
1394 #if 0
1395 #define pr_debug(format,args...)
1396 /*
1397 #define pr_debug printk
1398 */
1399 #endif
1400 #define DEBUG_ARP_TABLE 0
1401
1402 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1403
1404 static void lec_arp_check_expire(struct work_struct *work);
1405 static void lec_arp_expire_arp(unsigned long data);
1406
1407 /*
1408  * Arp table funcs
1409  */
1410
1411 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE -1))
1412
1413 /*
1414  * Initialization of arp-cache
1415  */
1416 static void lec_arp_init(struct lec_priv *priv)
1417 {
1418         unsigned short i;
1419
1420         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1421                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1422         }
1423         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1424         INIT_HLIST_HEAD(&priv->lec_no_forward);
1425         INIT_HLIST_HEAD(&priv->mcast_fwds);
1426         spin_lock_init(&priv->lec_arp_lock);
1427         INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1428         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1429 }
1430
1431 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1432 {
1433         if (entry->vcc) {
1434                 struct atm_vcc *vcc = entry->vcc;
1435                 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1436                 struct net_device *dev = (struct net_device *)vcc->proto_data;
1437
1438                 vcc->pop = vpriv->old_pop;
1439                 if (vpriv->xoff)
1440                         netif_wake_queue(dev);
1441                 kfree(vpriv);
1442                 vcc->user_back = NULL;
1443                 vcc->push = entry->old_push;
1444                 vcc_release_async(vcc, -EPIPE);
1445                 entry->vcc = NULL;
1446         }
1447         if (entry->recv_vcc) {
1448                 entry->recv_vcc->push = entry->old_recv_push;
1449                 vcc_release_async(entry->recv_vcc, -EPIPE);
1450                 entry->recv_vcc = NULL;
1451         }
1452 }
1453
1454 /*
1455  * Insert entry to lec_arp_table
1456  * LANE2: Add to the end of the list to satisfy 8.1.13
1457  */
1458 static inline void
1459 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1460 {
1461         struct hlist_head *tmp;
1462
1463         tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1464         hlist_add_head(&entry->next, tmp);
1465
1466         pr_debug("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1467                 0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
1468                 0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
1469                 0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
1470 }
1471
1472 /*
1473  * Remove entry from lec_arp_table
1474  */
1475 static int
1476 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1477 {
1478         struct hlist_node *node;
1479         struct lec_arp_table *entry;
1480         int i, remove_vcc = 1;
1481
1482         if (!to_remove) {
1483                 return -1;
1484         }
1485
1486         hlist_del(&to_remove->next);
1487         del_timer(&to_remove->timer);
1488
1489         /* If this is the only MAC connected to this VCC, also tear down the VCC */
1490         if (to_remove->status >= ESI_FLUSH_PENDING) {
1491                 /*
1492                  * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1493                  */
1494                 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1495                         hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
1496                                 if (memcmp(to_remove->atm_addr,
1497                                            entry->atm_addr, ATM_ESA_LEN) == 0) {
1498                                         remove_vcc = 0;
1499                                         break;
1500                                 }
1501                         }
1502                 }
1503                 if (remove_vcc)
1504                         lec_arp_clear_vccs(to_remove);
1505         }
1506         skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1507
1508         pr_debug("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1509                 0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
1510                 0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
1511                 0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
1512         return 0;
1513 }
1514
1515 #if DEBUG_ARP_TABLE
1516 static char *get_status_string(unsigned char st)
1517 {
1518         switch (st) {
1519         case ESI_UNKNOWN:
1520                 return "ESI_UNKNOWN";
1521         case ESI_ARP_PENDING:
1522                 return "ESI_ARP_PENDING";
1523         case ESI_VC_PENDING:
1524                 return "ESI_VC_PENDING";
1525         case ESI_FLUSH_PENDING:
1526                 return "ESI_FLUSH_PENDING";
1527         case ESI_FORWARD_DIRECT:
1528                 return "ESI_FORWARD_DIRECT";
1529         default:
1530                 return "<UNKNOWN>";
1531         }
1532 }
1533
1534 static void dump_arp_table(struct lec_priv *priv)
1535 {
1536         struct hlist_node *node;
1537         struct lec_arp_table *rulla;
1538         char buf[256];
1539         int i, j, offset;
1540
1541         printk("Dump %p:\n", priv);
1542         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1543                 hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
1544                         offset = 0;
1545                         offset += sprintf(buf, "%d: %p\n", i, rulla);
1546                         offset += sprintf(buf + offset, "Mac:");
1547                         for (j = 0; j < ETH_ALEN; j++) {
1548                                 offset += sprintf(buf + offset,
1549                                                   "%2.2x ",
1550                                                   rulla->mac_addr[j] & 0xff);
1551                         }
1552                         offset += sprintf(buf + offset, "Atm:");
1553                         for (j = 0; j < ATM_ESA_LEN; j++) {
1554                                 offset += sprintf(buf + offset,
1555                                                   "%2.2x ",
1556                                                   rulla->atm_addr[j] & 0xff);
1557                         }
1558                         offset += sprintf(buf + offset,
1559                                           "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1560                                           rulla->vcc ? rulla->vcc->vpi : 0,
1561                                           rulla->vcc ? rulla->vcc->vci : 0,
1562                                           rulla->recv_vcc ? rulla->recv_vcc->
1563                                           vpi : 0,
1564                                           rulla->recv_vcc ? rulla->recv_vcc->
1565                                           vci : 0, rulla->last_used,
1566                                           rulla->timestamp, rulla->no_tries);
1567                         offset +=
1568                             sprintf(buf + offset,
1569                                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1570                                     rulla->flags, rulla->packets_flooded,
1571                                     get_status_string(rulla->status));
1572                         printk("%s\n", buf);
1573                 }
1574         }
1575
1576         if (!hlist_empty(&priv->lec_no_forward))
1577                 printk("No forward\n");
1578         hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1579                 offset = 0;
1580                 offset += sprintf(buf + offset, "Mac:");
1581                 for (j = 0; j < ETH_ALEN; j++) {
1582                         offset += sprintf(buf + offset, "%2.2x ",
1583                                           rulla->mac_addr[j] & 0xff);
1584                 }
1585                 offset += sprintf(buf + offset, "Atm:");
1586                 for (j = 0; j < ATM_ESA_LEN; j++) {
1587                         offset += sprintf(buf + offset, "%2.2x ",
1588                                           rulla->atm_addr[j] & 0xff);
1589                 }
1590                 offset += sprintf(buf + offset,
1591                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1592                                   rulla->vcc ? rulla->vcc->vpi : 0,
1593                                   rulla->vcc ? rulla->vcc->vci : 0,
1594                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1595                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1596                                   rulla->last_used,
1597                                   rulla->timestamp, rulla->no_tries);
1598                 offset += sprintf(buf + offset,
1599                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1600                                   rulla->flags, rulla->packets_flooded,
1601                                   get_status_string(rulla->status));
1602                 printk("%s\n", buf);
1603         }
1604
1605         if (!hlist_empty(&priv->lec_arp_empty_ones))
1606                 printk("Empty ones\n");
1607         hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1608                 offset = 0;
1609                 offset += sprintf(buf + offset, "Mac:");
1610                 for (j = 0; j < ETH_ALEN; j++) {
1611                         offset += sprintf(buf + offset, "%2.2x ",
1612                                           rulla->mac_addr[j] & 0xff);
1613                 }
1614                 offset += sprintf(buf + offset, "Atm:");
1615                 for (j = 0; j < ATM_ESA_LEN; j++) {
1616                         offset += sprintf(buf + offset, "%2.2x ",
1617                                           rulla->atm_addr[j] & 0xff);
1618                 }
1619                 offset += sprintf(buf + offset,
1620                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1621                                   rulla->vcc ? rulla->vcc->vpi : 0,
1622                                   rulla->vcc ? rulla->vcc->vci : 0,
1623                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1624                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1625                                   rulla->last_used,
1626                                   rulla->timestamp, rulla->no_tries);
1627                 offset += sprintf(buf + offset,
1628                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1629                                   rulla->flags, rulla->packets_flooded,
1630                                   get_status_string(rulla->status));
1631                 printk("%s", buf);
1632         }
1633
1634         if (!hlist_empty(&priv->mcast_fwds))
1635                 printk("Multicast Forward VCCs\n");
1636         hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1637                 offset = 0;
1638                 offset += sprintf(buf + offset, "Mac:");
1639                 for (j = 0; j < ETH_ALEN; j++) {
1640                         offset += sprintf(buf + offset, "%2.2x ",
1641                                           rulla->mac_addr[j] & 0xff);
1642                 }
1643                 offset += sprintf(buf + offset, "Atm:");
1644                 for (j = 0; j < ATM_ESA_LEN; j++) {
1645                         offset += sprintf(buf + offset, "%2.2x ",
1646                                           rulla->atm_addr[j] & 0xff);
1647                 }
1648                 offset += sprintf(buf + offset,
1649                                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1650                                   rulla->vcc ? rulla->vcc->vpi : 0,
1651                                   rulla->vcc ? rulla->vcc->vci : 0,
1652                                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1653                                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1654                                   rulla->last_used,
1655                                   rulla->timestamp, rulla->no_tries);
1656                 offset += sprintf(buf + offset,
1657                                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1658                                   rulla->flags, rulla->packets_flooded,
1659                                   get_status_string(rulla->status));
1660                 printk("%s\n", buf);
1661         }
1662
1663 }
1664 #else
1665 #define dump_arp_table(priv) do { } while (0)
1666 #endif
1667
1668 /*
1669  * Destruction of arp-cache
1670  */
1671 static void lec_arp_destroy(struct lec_priv *priv)
1672 {
1673         unsigned long flags;
1674         struct hlist_node *node, *next;
1675         struct lec_arp_table *entry;
1676         int i;
1677
1678         cancel_rearming_delayed_work(&priv->lec_arp_work);
1679
1680         /*
1681          * Remove all entries
1682          */
1683
1684         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1685         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1686                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1687                         lec_arp_remove(priv, entry);
1688                         lec_arp_put(entry);
1689                 }
1690                 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1691         }
1692
1693         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
1694                 del_timer_sync(&entry->timer);
1695                 lec_arp_clear_vccs(entry);
1696                 hlist_del(&entry->next);
1697                 lec_arp_put(entry);
1698         }
1699         INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1700
1701         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
1702                 del_timer_sync(&entry->timer);
1703                 lec_arp_clear_vccs(entry);
1704                 hlist_del(&entry->next);
1705                 lec_arp_put(entry);
1706         }
1707         INIT_HLIST_HEAD(&priv->lec_no_forward);
1708
1709         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1710                 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1711                 lec_arp_clear_vccs(entry);
1712                 hlist_del(&entry->next);
1713                 lec_arp_put(entry);
1714         }
1715         INIT_HLIST_HEAD(&priv->mcast_fwds);
1716         priv->mcast_vcc = NULL;
1717         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1718 }
1719
1720 /*
1721  * Find entry by mac_address
1722  */
1723 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1724                                           const unsigned char *mac_addr)
1725 {
1726         struct hlist_node *node;
1727         struct hlist_head *head;
1728         struct lec_arp_table *entry;
1729
1730         pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
1731                 mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
1732                 mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);
1733
1734         head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1735         hlist_for_each_entry(entry, node, head, next) {
1736                 if (!compare_ether_addr(mac_addr, entry->mac_addr)) {
1737                         return entry;
1738                 }
1739         }
1740         return NULL;
1741 }
1742
1743 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1744                                         const unsigned char *mac_addr)
1745 {
1746         struct lec_arp_table *to_return;
1747
1748         to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1749         if (!to_return) {
1750                 printk("LEC: Arp entry kmalloc failed\n");
1751                 return NULL;
1752         }
1753         memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1754         INIT_HLIST_NODE(&to_return->next);
1755         setup_timer(&to_return->timer, lec_arp_expire_arp,
1756                         (unsigned long)to_return);
1757         to_return->last_used = jiffies;
1758         to_return->priv = priv;
1759         skb_queue_head_init(&to_return->tx_wait);
1760         atomic_set(&to_return->usage, 1);
1761         return to_return;
1762 }
1763
1764 /* Arp sent timer expired */
1765 static void lec_arp_expire_arp(unsigned long data)
1766 {
1767         struct lec_arp_table *entry;
1768
1769         entry = (struct lec_arp_table *)data;
1770
1771         pr_debug("lec_arp_expire_arp\n");
1772         if (entry->status == ESI_ARP_PENDING) {
1773                 if (entry->no_tries <= entry->priv->max_retry_count) {
1774                         if (entry->is_rdesc)
1775                                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1776                                              entry->mac_addr, NULL, NULL);
1777                         else
1778                                 send_to_lecd(entry->priv, l_arp_xmt,
1779                                              entry->mac_addr, NULL, NULL);
1780                         entry->no_tries++;
1781                 }
1782                 mod_timer(&entry->timer, jiffies + (1 * HZ));
1783         }
1784 }
1785
1786 /* Unknown/unused vcc expire, remove associated entry */
1787 static void lec_arp_expire_vcc(unsigned long data)
1788 {
1789         unsigned long flags;
1790         struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1791         struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1792
1793         del_timer(&to_remove->timer);
1794
1795         pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc vpi:%d vci:%d\n",
1796                 to_remove, priv,
1797                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1798                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1799
1800         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1801         hlist_del(&to_remove->next);
1802         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1803
1804         lec_arp_clear_vccs(to_remove);
1805         lec_arp_put(to_remove);
1806 }
1807
1808 /*
1809  * Expire entries.
1810  * 1. Re-set timer
1811  * 2. For each entry, delete entries that have aged past the age limit.
1812  * 3. For each entry, depending on the status of the entry, perform
1813  *    the following maintenance.
1814  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1815  *       tick_count is above the max_unknown_frame_time, clear
1816  *       the tick_count to zero and clear the packets_flooded counter
1817  *       to zero. This supports the packet rate limit per address
1818  *       while flooding unknowns.
1819  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1820  *       than or equal to the path_switching_delay, change the status
1821  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1822  *       regardless of the progress of the flush protocol.
1823  */
1824 static void lec_arp_check_expire(struct work_struct *work)
1825 {
1826         unsigned long flags;
1827         struct lec_priv *priv =
1828                 container_of(work, struct lec_priv, lec_arp_work.work);
1829         struct hlist_node *node, *next;
1830         struct lec_arp_table *entry;
1831         unsigned long now;
1832         unsigned long time_to_check;
1833         int i;
1834
1835         pr_debug("lec_arp_check_expire %p\n", priv);
1836         now = jiffies;
1837 restart:
1838         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1839         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1840                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
1841                         if ((entry->flags) & LEC_REMOTE_FLAG &&
1842                             priv->topology_change)
1843                                 time_to_check = priv->forward_delay_time;
1844                         else
1845                                 time_to_check = priv->aging_time;
1846
1847                         pr_debug("About to expire: %lx - %lx > %lx\n",
1848                                 now, entry->last_used, time_to_check);
1849                         if (time_after(now, entry->last_used + time_to_check)
1850                             && !(entry->flags & LEC_PERMANENT_FLAG)
1851                             && !(entry->mac_addr[0] & 0x01)) {  /* LANE2: 7.1.20 */
1852                                 /* Remove entry */
1853                                 pr_debug("LEC:Entry timed out\n");
1854                                 lec_arp_remove(priv, entry);
1855                                 lec_arp_put(entry);
1856                         } else {
1857                                 /* Something else */
1858                                 if ((entry->status == ESI_VC_PENDING ||
1859                                      entry->status == ESI_ARP_PENDING)
1860                                     && time_after_eq(now,
1861                                                      entry->timestamp +
1862                                                      priv->
1863                                                      max_unknown_frame_time)) {
1864                                         entry->timestamp = jiffies;
1865                                         entry->packets_flooded = 0;
1866                                         if (entry->status == ESI_VC_PENDING)
1867                                                 send_to_lecd(priv, l_svc_setup,
1868                                                              entry->mac_addr,
1869                                                              entry->atm_addr,
1870                                                              NULL);
1871                                 }
1872                                 if (entry->status == ESI_FLUSH_PENDING
1873                                     &&
1874                                     time_after_eq(now, entry->timestamp +
1875                                                   priv->path_switching_delay)) {
1876                                         struct sk_buff *skb;
1877                                         struct atm_vcc *vcc = entry->vcc;
1878
1879                                         lec_arp_hold(entry);
1880                                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1881                                         while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
1882                                                 lec_send(vcc, skb);
1883                                         entry->last_used = jiffies;
1884                                         entry->status = ESI_FORWARD_DIRECT;
1885                                         lec_arp_put(entry);
1886                                         goto restart;
1887                                 }
1888                         }
1889                 }
1890         }
1891         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1892
1893         schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1894 }
1895
1896 /*
1897  * Try to find vcc where mac_address is attached.
1898  *
1899  */
1900 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1901                                        const unsigned char *mac_to_find, int is_rdesc,
1902                                        struct lec_arp_table **ret_entry)
1903 {
1904         unsigned long flags;
1905         struct lec_arp_table *entry;
1906         struct atm_vcc *found;
1907
1908         if (mac_to_find[0] & 0x01) {
1909                 switch (priv->lane_version) {
1910                 case 1:
1911                         return priv->mcast_vcc;
1912                 case 2: /* LANE2 wants arp for multicast addresses */
1913                         if (!compare_ether_addr(mac_to_find, bus_mac))
1914                                 return priv->mcast_vcc;
1915                         break;
1916                 default:
1917                         break;
1918                 }
1919         }
1920
1921         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1922         entry = lec_arp_find(priv, mac_to_find);
1923
1924         if (entry) {
1925                 if (entry->status == ESI_FORWARD_DIRECT) {
1926                         /* Connection Ok */
1927                         entry->last_used = jiffies;
1928                         lec_arp_hold(entry);
1929                         *ret_entry = entry;
1930                         found = entry->vcc;
1931                         goto out;
1932                 }
1933                 /*
1934                  * If the LE_ARP cache entry is still pending, reset count to 0
1935                  * so another LE_ARP request can be made for this frame.
1936                  */
1937                 if (entry->status == ESI_ARP_PENDING) {
1938                         entry->no_tries = 0;
1939                 }
1940                 /*
1941                  * Data direct VC not yet set up, check to see if the unknown
1942                  * frame count is greater than the limit. If the limit has
1943                  * not been reached, allow the caller to send packet to
1944                  * BUS.
1945                  */
1946                 if (entry->status != ESI_FLUSH_PENDING &&
1947                     entry->packets_flooded <
1948                     priv->maximum_unknown_frame_count) {
1949                         entry->packets_flooded++;
1950                         pr_debug("LEC_ARP: Flooding..\n");
1951                         found = priv->mcast_vcc;
1952                         goto out;
1953                 }
1954                 /*
1955                  * We got here because entry->status == ESI_FLUSH_PENDING
1956                  * or BUS flood limit was reached for an entry which is
1957                  * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1958                  */
1959                 lec_arp_hold(entry);
1960                 *ret_entry = entry;
1961                 pr_debug("lec: entry->status %d entry->vcc %p\n", entry->status,
1962                         entry->vcc);
1963                 found = NULL;
1964         } else {
1965                 /* No matching entry was found */
1966                 entry = make_entry(priv, mac_to_find);
1967                 pr_debug("LEC_ARP: Making entry\n");
1968                 if (!entry) {
1969                         found = priv->mcast_vcc;
1970                         goto out;
1971                 }
1972                 lec_arp_add(priv, entry);
1973                 /* We want arp-request(s) to be sent */
1974                 entry->packets_flooded = 1;
1975                 entry->status = ESI_ARP_PENDING;
1976                 entry->no_tries = 1;
1977                 entry->last_used = entry->timestamp = jiffies;
1978                 entry->is_rdesc = is_rdesc;
1979                 if (entry->is_rdesc)
1980                         send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1981                                      NULL);
1982                 else
1983                         send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1984                 entry->timer.expires = jiffies + (1 * HZ);
1985                 entry->timer.function = lec_arp_expire_arp;
1986                 add_timer(&entry->timer);
1987                 found = priv->mcast_vcc;
1988         }
1989
1990 out:
1991         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1992         return found;
1993 }
1994
1995 static int
1996 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1997                 unsigned long permanent)
1998 {
1999         unsigned long flags;
2000         struct hlist_node *node, *next;
2001         struct lec_arp_table *entry;
2002         int i;
2003
2004         pr_debug("lec_addr_delete\n");
2005         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2006         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2007                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2008                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)
2009                             && (permanent ||
2010                                 !(entry->flags & LEC_PERMANENT_FLAG))) {
2011                                 lec_arp_remove(priv, entry);
2012                                 lec_arp_put(entry);
2013                         }
2014                         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2015                         return 0;
2016                 }
2017         }
2018         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2019         return -1;
2020 }
2021
2022 /*
2023  * Notifies:  Response to arp_request (atm_addr != NULL)
2024  */
2025 static void
2026 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
2027                const unsigned char *atm_addr, unsigned long remoteflag,
2028                unsigned int targetless_le_arp)
2029 {
2030         unsigned long flags;
2031         struct hlist_node *node, *next;
2032         struct lec_arp_table *entry, *tmp;
2033         int i;
2034
2035         pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
2036         pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2037                 mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
2038                 mac_addr[4], mac_addr[5]);
2039
2040         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2041         entry = lec_arp_find(priv, mac_addr);
2042         if (entry == NULL && targetless_le_arp)
2043                 goto out;       /*
2044                                  * LANE2: ignore targetless LE_ARPs for which
2045                                  * we have no entry in the cache. 7.1.30
2046                                  */
2047         if (!hlist_empty(&priv->lec_arp_empty_ones)) {
2048                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2049                         if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2050                                 hlist_del(&entry->next);
2051                                 del_timer(&entry->timer);
2052                                 tmp = lec_arp_find(priv, mac_addr);
2053                                 if (tmp) {
2054                                         del_timer(&tmp->timer);
2055                                         tmp->status = ESI_FORWARD_DIRECT;
2056                                         memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2057                                         tmp->vcc = entry->vcc;
2058                                         tmp->old_push = entry->old_push;
2059                                         tmp->last_used = jiffies;
2060                                         del_timer(&entry->timer);
2061                                         lec_arp_put(entry);
2062                                         entry = tmp;
2063                                 } else {
2064                                         entry->status = ESI_FORWARD_DIRECT;
2065                                         memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2066                                         entry->last_used = jiffies;
2067                                         lec_arp_add(priv, entry);
2068                                 }
2069                                 if (remoteflag)
2070                                         entry->flags |= LEC_REMOTE_FLAG;
2071                                 else
2072                                         entry->flags &= ~LEC_REMOTE_FLAG;
2073                                 pr_debug("After update\n");
2074                                 dump_arp_table(priv);
2075                                 goto out;
2076                         }
2077                 }
2078         }
2079
2080         entry = lec_arp_find(priv, mac_addr);
2081         if (!entry) {
2082                 entry = make_entry(priv, mac_addr);
2083                 if (!entry)
2084                         goto out;
2085                 entry->status = ESI_UNKNOWN;
2086                 lec_arp_add(priv, entry);
2087                 /* Temporary, changes before end of function */
2088         }
2089         memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2090         del_timer(&entry->timer);
2091         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2092                 hlist_for_each_entry(tmp, node, &priv->lec_arp_tables[i], next) {
2093                         if (entry != tmp &&
2094                             !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2095                                 /* Vcc to this host exists */
2096                                 if (tmp->status > ESI_VC_PENDING) {
2097                                         /*
2098                                          * ESI_FLUSH_PENDING,
2099                                          * ESI_FORWARD_DIRECT
2100                                          */
2101                                         entry->vcc = tmp->vcc;
2102                                         entry->old_push = tmp->old_push;
2103                                 }
2104                                 entry->status = tmp->status;
2105                                 break;
2106                         }
2107                 }
2108         }
2109         if (remoteflag)
2110                 entry->flags |= LEC_REMOTE_FLAG;
2111         else
2112                 entry->flags &= ~LEC_REMOTE_FLAG;
2113         if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2114                 entry->status = ESI_VC_PENDING;
2115                 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2116         }
2117         pr_debug("After update2\n");
2118         dump_arp_table(priv);
2119 out:
2120         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2121 }
2122
2123 /*
2124  * Notifies: Vcc setup ready
2125  */
2126 static void
2127 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2128               struct atm_vcc *vcc,
2129               void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2130 {
2131         unsigned long flags;
2132         struct hlist_node *node;
2133         struct lec_arp_table *entry;
2134         int i, found_entry = 0;
2135
2136         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2137         if (ioc_data->receive == 2) {
2138                 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2139
2140                 pr_debug("LEC_ARP: Attaching mcast forward\n");
2141 #if 0
2142                 entry = lec_arp_find(priv, bus_mac);
2143                 if (!entry) {
2144                         printk("LEC_ARP: Multicast entry not found!\n");
2145                         goto out;
2146                 }
2147                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2148                 entry->recv_vcc = vcc;
2149                 entry->old_recv_push = old_push;
2150 #endif
2151                 entry = make_entry(priv, bus_mac);
2152                 if (entry == NULL)
2153                         goto out;
2154                 del_timer(&entry->timer);
2155                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2156                 entry->recv_vcc = vcc;
2157                 entry->old_recv_push = old_push;
2158                 hlist_add_head(&entry->next, &priv->mcast_fwds);
2159                 goto out;
2160         } else if (ioc_data->receive == 1) {
2161                 /*
2162                  * Vcc which we don't want to make default vcc,
2163                  * attach it anyway.
2164                  */
2165                 pr_debug
2166                     ("LEC_ARP:Attaching data direct, not default: "
2167                      "%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",
2168                      ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2169                      ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2170                      ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2171                      ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2172                      ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2173                      ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2174                      ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2175                      ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2176                      ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2177                      ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2178                 entry = make_entry(priv, bus_mac);
2179                 if (entry == NULL)
2180                         goto out;
2181                 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2182                 memset(entry->mac_addr, 0, ETH_ALEN);
2183                 entry->recv_vcc = vcc;
2184                 entry->old_recv_push = old_push;
2185                 entry->status = ESI_UNKNOWN;
2186                 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2187                 entry->timer.function = lec_arp_expire_vcc;
2188                 hlist_add_head(&entry->next, &priv->lec_no_forward);
2189                 add_timer(&entry->timer);
2190                 dump_arp_table(priv);
2191                 goto out;
2192         }
2193         pr_debug
2194             ("LEC_ARP:Attaching data direct, default: "
2195              "%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",
2196              ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2197              ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2198              ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2199              ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2200              ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2201              ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2202              ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2203              ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2204              ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2205              ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2206         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2207                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2208                         if (memcmp
2209                             (ioc_data->atm_addr, entry->atm_addr,
2210                              ATM_ESA_LEN) == 0) {
2211                                 pr_debug("LEC_ARP: Attaching data direct\n");
2212                                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2213                                         entry->vcc ? entry->vcc->vci : 0,
2214                                         entry->recv_vcc ? entry->recv_vcc->
2215                                         vci : 0);
2216                                 found_entry = 1;
2217                                 del_timer(&entry->timer);
2218                                 entry->vcc = vcc;
2219                                 entry->old_push = old_push;
2220                                 if (entry->status == ESI_VC_PENDING) {
2221                                         if (priv->maximum_unknown_frame_count
2222                                             == 0)
2223                                                 entry->status =
2224                                                     ESI_FORWARD_DIRECT;
2225                                         else {
2226                                                 entry->timestamp = jiffies;
2227                                                 entry->status =
2228                                                     ESI_FLUSH_PENDING;
2229 #if 0
2230                                                 send_to_lecd(priv, l_flush_xmt,
2231                                                              NULL,
2232                                                              entry->atm_addr,
2233                                                              NULL);
2234 #endif
2235                                         }
2236                                 } else {
2237                                         /*
2238                                          * They were forming a connection
2239                                          * to us, and we to them. Our
2240                                          * ATM address is numerically lower
2241                                          * than theirs, so we make connection
2242                                          * we formed into default VCC (8.1.11).
2243                                          * Connection they made gets torn
2244                                          * down. This might confuse some
2245                                          * clients. Can be changed if
2246                                          * someone reports trouble...
2247                                          */
2248                                         ;
2249                                 }
2250                         }
2251                 }
2252         }
2253         if (found_entry) {
2254                 pr_debug("After vcc was added\n");
2255                 dump_arp_table(priv);
2256                 goto out;
2257         }
2258         /*
2259          * Not found, snatch address from first data packet that arrives
2260          * from this vcc
2261          */
2262         entry = make_entry(priv, bus_mac);
2263         if (!entry)
2264                 goto out;
2265         entry->vcc = vcc;
2266         entry->old_push = old_push;
2267         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2268         memset(entry->mac_addr, 0, ETH_ALEN);
2269         entry->status = ESI_UNKNOWN;
2270         hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2271         entry->timer.expires = jiffies + priv->vcc_timeout_period;
2272         entry->timer.function = lec_arp_expire_vcc;
2273         add_timer(&entry->timer);
2274         pr_debug("After vcc was added\n");
2275         dump_arp_table(priv);
2276 out:
2277         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2278 }
2279
2280 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2281 {
2282         unsigned long flags;
2283         struct hlist_node *node;
2284         struct lec_arp_table *entry;
2285         int i;
2286
2287         pr_debug("LEC:lec_flush_complete %lx\n", tran_id);
2288 restart:
2289         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2290         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2291                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2292                         if (entry->flush_tran_id == tran_id
2293                             && entry->status == ESI_FLUSH_PENDING) {
2294                                 struct sk_buff *skb;
2295                                 struct atm_vcc *vcc = entry->vcc;
2296
2297                                 lec_arp_hold(entry);
2298                                 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2299                                 while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
2300                                         lec_send(vcc, skb);
2301                                 entry->last_used = jiffies;
2302                                 entry->status = ESI_FORWARD_DIRECT;
2303                                 lec_arp_put(entry);
2304                                 pr_debug("LEC_ARP: Flushed\n");
2305                                 goto restart;
2306                         }
2307                 }
2308         }
2309         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2310         dump_arp_table(priv);
2311 }
2312
2313 static void
2314 lec_set_flush_tran_id(struct lec_priv *priv,
2315                       const unsigned char *atm_addr, unsigned long tran_id)
2316 {
2317         unsigned long flags;
2318         struct hlist_node *node;
2319         struct lec_arp_table *entry;
2320         int i;
2321
2322         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2323         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2324                 hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
2325                         if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2326                                 entry->flush_tran_id = tran_id;
2327                                 pr_debug("Set flush transaction id to %lx for %p\n",
2328                                         tran_id, entry);
2329                         }
2330                 }
2331         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2332 }
2333
2334 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2335 {
2336         unsigned long flags;
2337         unsigned char mac_addr[] = {
2338                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2339         };
2340         struct lec_arp_table *to_add;
2341         struct lec_vcc_priv *vpriv;
2342         int err = 0;
2343
2344         if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
2345                 return -ENOMEM;
2346         vpriv->xoff = 0;
2347         vpriv->old_pop = vcc->pop;
2348         vcc->user_back = vpriv;
2349         vcc->pop = lec_pop;
2350         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2351         to_add = make_entry(priv, mac_addr);
2352         if (!to_add) {
2353                 vcc->pop = vpriv->old_pop;
2354                 kfree(vpriv);
2355                 err = -ENOMEM;
2356                 goto out;
2357         }
2358         memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2359         to_add->status = ESI_FORWARD_DIRECT;
2360         to_add->flags |= LEC_PERMANENT_FLAG;
2361         to_add->vcc = vcc;
2362         to_add->old_push = vcc->push;
2363         vcc->push = lec_push;
2364         priv->mcast_vcc = vcc;
2365         lec_arp_add(priv, to_add);
2366 out:
2367         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2368         return err;
2369 }
2370
2371 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2372 {
2373         unsigned long flags;
2374         struct hlist_node *node, *next;
2375         struct lec_arp_table *entry;
2376         int i;
2377
2378         pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2379         dump_arp_table(priv);
2380
2381         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2382
2383         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2384                 hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
2385                         if (vcc == entry->vcc) {
2386                                 lec_arp_remove(priv, entry);
2387                                 lec_arp_put(entry);
2388                                 if (priv->mcast_vcc == vcc) {
2389                                         priv->mcast_vcc = NULL;
2390                                 }
2391                         }
2392                 }
2393         }
2394
2395         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2396                 if (entry->vcc == vcc) {
2397                         lec_arp_clear_vccs(entry);
2398                         del_timer(&entry->timer);
2399                         hlist_del(&entry->next);
2400                         lec_arp_put(entry);
2401                 }
2402         }
2403
2404         hlist_for_each_entry_safe(entry, node, next, &priv->lec_no_forward, next) {
2405                 if (entry->recv_vcc == vcc) {
2406                         lec_arp_clear_vccs(entry);
2407                         del_timer(&entry->timer);
2408                         hlist_del(&entry->next);
2409                         lec_arp_put(entry);
2410                 }
2411         }
2412
2413         hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2414                 if (entry->recv_vcc == vcc) {
2415                         lec_arp_clear_vccs(entry);
2416                         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2417                         hlist_del(&entry->next);
2418                         lec_arp_put(entry);
2419                 }
2420         }
2421
2422         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2423         dump_arp_table(priv);
2424 }
2425
2426 static void
2427 lec_arp_check_empties(struct lec_priv *priv,
2428                       struct atm_vcc *vcc, struct sk_buff *skb)
2429 {
2430         unsigned long flags;
2431         struct hlist_node *node, *next;
2432         struct lec_arp_table *entry, *tmp;
2433         struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2434         unsigned char *src;
2435 #ifdef CONFIG_TR
2436         struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2437
2438         if (priv->is_trdev)
2439                 src = tr_hdr->h_source;
2440         else
2441 #endif
2442                 src = hdr->h_source;
2443
2444         spin_lock_irqsave(&priv->lec_arp_lock, flags);
2445         hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
2446                 if (vcc == entry->vcc) {
2447                         del_timer(&entry->timer);
2448                         memcpy(entry->mac_addr, src, ETH_ALEN);
2449                         entry->status = ESI_FORWARD_DIRECT;
2450                         entry->last_used = jiffies;
2451                         /* We might have got an entry */
2452                         if ((tmp = lec_arp_find(priv, src))) {
2453                                 lec_arp_remove(priv, tmp);
2454                                 lec_arp_put(tmp);
2455                         }
2456                         hlist_del(&entry->next);
2457                         lec_arp_add(priv, entry);
2458                         goto out;
2459                 }
2460         }
2461         pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2462 out:
2463         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2464 }
2465
2466 MODULE_LICENSE("GPL");