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